1 //===- SemaChecking.cpp - Extra Semantic Checking -------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //  This file implements extra semantic analysis beyond what is enforced
11 //  by the C type system.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "clang/AST/APValue.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/Attr.h"
18 #include "clang/AST/AttrIterator.h"
19 #include "clang/AST/CharUnits.h"
20 #include "clang/AST/Decl.h"
21 #include "clang/AST/DeclBase.h"
22 #include "clang/AST/DeclCXX.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclarationName.h"
25 #include "clang/AST/EvaluatedExprVisitor.h"
26 #include "clang/AST/Expr.h"
27 #include "clang/AST/ExprCXX.h"
28 #include "clang/AST/ExprObjC.h"
29 #include "clang/AST/ExprOpenMP.h"
30 #include "clang/AST/NSAPI.h"
31 #include "clang/AST/NonTrivialTypeVisitor.h"
32 #include "clang/AST/OperationKinds.h"
33 #include "clang/AST/Stmt.h"
34 #include "clang/AST/TemplateBase.h"
35 #include "clang/AST/Type.h"
36 #include "clang/AST/TypeLoc.h"
37 #include "clang/AST/UnresolvedSet.h"
38 #include "clang/Analysis/Analyses/FormatString.h"
39 #include "clang/Basic/AddressSpaces.h"
40 #include "clang/Basic/CharInfo.h"
41 #include "clang/Basic/Diagnostic.h"
42 #include "clang/Basic/IdentifierTable.h"
43 #include "clang/Basic/LLVM.h"
44 #include "clang/Basic/LangOptions.h"
45 #include "clang/Basic/OpenCLOptions.h"
46 #include "clang/Basic/OperatorKinds.h"
47 #include "clang/Basic/PartialDiagnostic.h"
48 #include "clang/Basic/SourceLocation.h"
49 #include "clang/Basic/SourceManager.h"
50 #include "clang/Basic/Specifiers.h"
51 #include "clang/Basic/SyncScope.h"
52 #include "clang/Basic/TargetBuiltins.h"
53 #include "clang/Basic/TargetCXXABI.h"
54 #include "clang/Basic/TargetInfo.h"
55 #include "clang/Basic/TypeTraits.h"
56 #include "clang/Lex/Lexer.h" // TODO: Extract static functions to fix layering.
57 #include "clang/Sema/Initialization.h"
58 #include "clang/Sema/Lookup.h"
59 #include "clang/Sema/Ownership.h"
60 #include "clang/Sema/Scope.h"
61 #include "clang/Sema/ScopeInfo.h"
62 #include "clang/Sema/Sema.h"
63 #include "clang/Sema/SemaInternal.h"
64 #include "llvm/ADT/APFloat.h"
65 #include "llvm/ADT/APInt.h"
66 #include "llvm/ADT/APSInt.h"
67 #include "llvm/ADT/ArrayRef.h"
68 #include "llvm/ADT/DenseMap.h"
69 #include "llvm/ADT/FoldingSet.h"
70 #include "llvm/ADT/None.h"
71 #include "llvm/ADT/Optional.h"
72 #include "llvm/ADT/STLExtras.h"
73 #include "llvm/ADT/SmallBitVector.h"
74 #include "llvm/ADT/SmallPtrSet.h"
75 #include "llvm/ADT/SmallString.h"
76 #include "llvm/ADT/SmallVector.h"
77 #include "llvm/ADT/StringRef.h"
78 #include "llvm/ADT/StringSwitch.h"
79 #include "llvm/ADT/Triple.h"
80 #include "llvm/Support/AtomicOrdering.h"
81 #include "llvm/Support/Casting.h"
82 #include "llvm/Support/Compiler.h"
83 #include "llvm/Support/ConvertUTF.h"
84 #include "llvm/Support/ErrorHandling.h"
85 #include "llvm/Support/Format.h"
86 #include "llvm/Support/Locale.h"
87 #include "llvm/Support/MathExtras.h"
88 #include "llvm/Support/raw_ostream.h"
89 #include <algorithm>
90 #include <cassert>
91 #include <cstddef>
92 #include <cstdint>
93 #include <functional>
94 #include <limits>
95 #include <string>
96 #include <tuple>
97 #include <utility>
98 
99 using namespace clang;
100 using namespace sema;
101 
102 SourceLocation Sema::getLocationOfStringLiteralByte(const StringLiteral *SL,
103                                                     unsigned ByteNo) const {
104   return SL->getLocationOfByte(ByteNo, getSourceManager(), LangOpts,
105                                Context.getTargetInfo());
106 }
107 
108 /// Checks that a call expression's argument count is the desired number.
109 /// This is useful when doing custom type-checking.  Returns true on error.
110 static bool checkArgCount(Sema &S, CallExpr *call, unsigned desiredArgCount) {
111   unsigned argCount = call->getNumArgs();
112   if (argCount == desiredArgCount) return false;
113 
114   if (argCount < desiredArgCount)
115     return S.Diag(call->getEndLoc(), diag::err_typecheck_call_too_few_args)
116            << 0 /*function call*/ << desiredArgCount << argCount
117            << call->getSourceRange();
118 
119   // Highlight all the excess arguments.
120   SourceRange range(call->getArg(desiredArgCount)->getBeginLoc(),
121                     call->getArg(argCount - 1)->getEndLoc());
122 
123   return S.Diag(range.getBegin(), diag::err_typecheck_call_too_many_args)
124     << 0 /*function call*/ << desiredArgCount << argCount
125     << call->getArg(1)->getSourceRange();
126 }
127 
128 /// Check that the first argument to __builtin_annotation is an integer
129 /// and the second argument is a non-wide string literal.
130 static bool SemaBuiltinAnnotation(Sema &S, CallExpr *TheCall) {
131   if (checkArgCount(S, TheCall, 2))
132     return true;
133 
134   // First argument should be an integer.
135   Expr *ValArg = TheCall->getArg(0);
136   QualType Ty = ValArg->getType();
137   if (!Ty->isIntegerType()) {
138     S.Diag(ValArg->getBeginLoc(), diag::err_builtin_annotation_first_arg)
139         << ValArg->getSourceRange();
140     return true;
141   }
142 
143   // Second argument should be a constant string.
144   Expr *StrArg = TheCall->getArg(1)->IgnoreParenCasts();
145   StringLiteral *Literal = dyn_cast<StringLiteral>(StrArg);
146   if (!Literal || !Literal->isAscii()) {
147     S.Diag(StrArg->getBeginLoc(), diag::err_builtin_annotation_second_arg)
148         << StrArg->getSourceRange();
149     return true;
150   }
151 
152   TheCall->setType(Ty);
153   return false;
154 }
155 
156 static bool SemaBuiltinMSVCAnnotation(Sema &S, CallExpr *TheCall) {
157   // We need at least one argument.
158   if (TheCall->getNumArgs() < 1) {
159     S.Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
160         << 0 << 1 << TheCall->getNumArgs()
161         << TheCall->getCallee()->getSourceRange();
162     return true;
163   }
164 
165   // All arguments should be wide string literals.
166   for (Expr *Arg : TheCall->arguments()) {
167     auto *Literal = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts());
168     if (!Literal || !Literal->isWide()) {
169       S.Diag(Arg->getBeginLoc(), diag::err_msvc_annotation_wide_str)
170           << Arg->getSourceRange();
171       return true;
172     }
173   }
174 
175   return false;
176 }
177 
178 /// Check that the argument to __builtin_addressof is a glvalue, and set the
179 /// result type to the corresponding pointer type.
180 static bool SemaBuiltinAddressof(Sema &S, CallExpr *TheCall) {
181   if (checkArgCount(S, TheCall, 1))
182     return true;
183 
184   ExprResult Arg(TheCall->getArg(0));
185   QualType ResultType = S.CheckAddressOfOperand(Arg, TheCall->getBeginLoc());
186   if (ResultType.isNull())
187     return true;
188 
189   TheCall->setArg(0, Arg.get());
190   TheCall->setType(ResultType);
191   return false;
192 }
193 
194 static bool SemaBuiltinOverflow(Sema &S, CallExpr *TheCall) {
195   if (checkArgCount(S, TheCall, 3))
196     return true;
197 
198   // First two arguments should be integers.
199   for (unsigned I = 0; I < 2; ++I) {
200     ExprResult Arg = TheCall->getArg(I);
201     QualType Ty = Arg.get()->getType();
202     if (!Ty->isIntegerType()) {
203       S.Diag(Arg.get()->getBeginLoc(), diag::err_overflow_builtin_must_be_int)
204           << Ty << Arg.get()->getSourceRange();
205       return true;
206     }
207     InitializedEntity Entity = InitializedEntity::InitializeParameter(
208         S.getASTContext(), Ty, /*consume*/ false);
209     Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg);
210     if (Arg.isInvalid())
211       return true;
212     TheCall->setArg(I, Arg.get());
213   }
214 
215   // Third argument should be a pointer to a non-const integer.
216   // IRGen correctly handles volatile, restrict, and address spaces, and
217   // the other qualifiers aren't possible.
218   {
219     ExprResult Arg = TheCall->getArg(2);
220     QualType Ty = Arg.get()->getType();
221     const auto *PtrTy = Ty->getAs<PointerType>();
222     if (!(PtrTy && PtrTy->getPointeeType()->isIntegerType() &&
223           !PtrTy->getPointeeType().isConstQualified())) {
224       S.Diag(Arg.get()->getBeginLoc(),
225              diag::err_overflow_builtin_must_be_ptr_int)
226           << Ty << Arg.get()->getSourceRange();
227       return true;
228     }
229     InitializedEntity Entity = InitializedEntity::InitializeParameter(
230         S.getASTContext(), Ty, /*consume*/ false);
231     Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg);
232     if (Arg.isInvalid())
233       return true;
234     TheCall->setArg(2, Arg.get());
235   }
236   return false;
237 }
238 
239 static void SemaBuiltinMemChkCall(Sema &S, FunctionDecl *FDecl,
240                                   CallExpr *TheCall, unsigned SizeIdx,
241                                   unsigned DstSizeIdx,
242                                   StringRef LikelyMacroName) {
243   if (TheCall->getNumArgs() <= SizeIdx ||
244       TheCall->getNumArgs() <= DstSizeIdx)
245     return;
246 
247   const Expr *SizeArg = TheCall->getArg(SizeIdx);
248   const Expr *DstSizeArg = TheCall->getArg(DstSizeIdx);
249 
250   llvm::APSInt Size, DstSize;
251 
252   // find out if both sizes are known at compile time
253   if (!SizeArg->EvaluateAsInt(Size, S.Context) ||
254       !DstSizeArg->EvaluateAsInt(DstSize, S.Context))
255     return;
256 
257   if (Size.ule(DstSize))
258     return;
259 
260   // Confirmed overflow, so generate the diagnostic.
261   StringRef FunctionName = FDecl->getName();
262   SourceLocation SL = TheCall->getBeginLoc();
263   SourceManager &SM = S.getSourceManager();
264   // If we're in an expansion of a macro whose name corresponds to this builtin,
265   // use the simple macro name and location.
266   if (SL.isMacroID() && Lexer::getImmediateMacroName(SL, SM, S.getLangOpts()) ==
267                             LikelyMacroName) {
268     FunctionName = LikelyMacroName;
269     SL = SM.getImmediateMacroCallerLoc(SL);
270   }
271 
272   S.Diag(SL, diag::warn_memcpy_chk_overflow)
273       << FunctionName << DstSize.toString(/*Radix=*/10)
274       << Size.toString(/*Radix=*/10);
275 }
276 
277 static bool SemaBuiltinCallWithStaticChain(Sema &S, CallExpr *BuiltinCall) {
278   if (checkArgCount(S, BuiltinCall, 2))
279     return true;
280 
281   SourceLocation BuiltinLoc = BuiltinCall->getBeginLoc();
282   Expr *Builtin = BuiltinCall->getCallee()->IgnoreImpCasts();
283   Expr *Call = BuiltinCall->getArg(0);
284   Expr *Chain = BuiltinCall->getArg(1);
285 
286   if (Call->getStmtClass() != Stmt::CallExprClass) {
287     S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_not_call)
288         << Call->getSourceRange();
289     return true;
290   }
291 
292   auto CE = cast<CallExpr>(Call);
293   if (CE->getCallee()->getType()->isBlockPointerType()) {
294     S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_block_call)
295         << Call->getSourceRange();
296     return true;
297   }
298 
299   const Decl *TargetDecl = CE->getCalleeDecl();
300   if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl))
301     if (FD->getBuiltinID()) {
302       S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_builtin_call)
303           << Call->getSourceRange();
304       return true;
305     }
306 
307   if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens())) {
308     S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_pdtor_call)
309         << Call->getSourceRange();
310     return true;
311   }
312 
313   ExprResult ChainResult = S.UsualUnaryConversions(Chain);
314   if (ChainResult.isInvalid())
315     return true;
316   if (!ChainResult.get()->getType()->isPointerType()) {
317     S.Diag(BuiltinLoc, diag::err_second_argument_to_cwsc_not_pointer)
318         << Chain->getSourceRange();
319     return true;
320   }
321 
322   QualType ReturnTy = CE->getCallReturnType(S.Context);
323   QualType ArgTys[2] = { ReturnTy, ChainResult.get()->getType() };
324   QualType BuiltinTy = S.Context.getFunctionType(
325       ReturnTy, ArgTys, FunctionProtoType::ExtProtoInfo());
326   QualType BuiltinPtrTy = S.Context.getPointerType(BuiltinTy);
327 
328   Builtin =
329       S.ImpCastExprToType(Builtin, BuiltinPtrTy, CK_BuiltinFnToFnPtr).get();
330 
331   BuiltinCall->setType(CE->getType());
332   BuiltinCall->setValueKind(CE->getValueKind());
333   BuiltinCall->setObjectKind(CE->getObjectKind());
334   BuiltinCall->setCallee(Builtin);
335   BuiltinCall->setArg(1, ChainResult.get());
336 
337   return false;
338 }
339 
340 static bool SemaBuiltinSEHScopeCheck(Sema &SemaRef, CallExpr *TheCall,
341                                      Scope::ScopeFlags NeededScopeFlags,
342                                      unsigned DiagID) {
343   // Scopes aren't available during instantiation. Fortunately, builtin
344   // functions cannot be template args so they cannot be formed through template
345   // instantiation. Therefore checking once during the parse is sufficient.
346   if (SemaRef.inTemplateInstantiation())
347     return false;
348 
349   Scope *S = SemaRef.getCurScope();
350   while (S && !S->isSEHExceptScope())
351     S = S->getParent();
352   if (!S || !(S->getFlags() & NeededScopeFlags)) {
353     auto *DRE = cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
354     SemaRef.Diag(TheCall->getExprLoc(), DiagID)
355         << DRE->getDecl()->getIdentifier();
356     return true;
357   }
358 
359   return false;
360 }
361 
362 static inline bool isBlockPointer(Expr *Arg) {
363   return Arg->getType()->isBlockPointerType();
364 }
365 
366 /// OpenCL C v2.0, s6.13.17.2 - Checks that the block parameters are all local
367 /// void*, which is a requirement of device side enqueue.
368 static bool checkOpenCLBlockArgs(Sema &S, Expr *BlockArg) {
369   const BlockPointerType *BPT =
370       cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
371   ArrayRef<QualType> Params =
372       BPT->getPointeeType()->getAs<FunctionProtoType>()->getParamTypes();
373   unsigned ArgCounter = 0;
374   bool IllegalParams = false;
375   // Iterate through the block parameters until either one is found that is not
376   // a local void*, or the block is valid.
377   for (ArrayRef<QualType>::iterator I = Params.begin(), E = Params.end();
378        I != E; ++I, ++ArgCounter) {
379     if (!(*I)->isPointerType() || !(*I)->getPointeeType()->isVoidType() ||
380         (*I)->getPointeeType().getQualifiers().getAddressSpace() !=
381             LangAS::opencl_local) {
382       // Get the location of the error. If a block literal has been passed
383       // (BlockExpr) then we can point straight to the offending argument,
384       // else we just point to the variable reference.
385       SourceLocation ErrorLoc;
386       if (isa<BlockExpr>(BlockArg)) {
387         BlockDecl *BD = cast<BlockExpr>(BlockArg)->getBlockDecl();
388         ErrorLoc = BD->getParamDecl(ArgCounter)->getBeginLoc();
389       } else if (isa<DeclRefExpr>(BlockArg)) {
390         ErrorLoc = cast<DeclRefExpr>(BlockArg)->getBeginLoc();
391       }
392       S.Diag(ErrorLoc,
393              diag::err_opencl_enqueue_kernel_blocks_non_local_void_args);
394       IllegalParams = true;
395     }
396   }
397 
398   return IllegalParams;
399 }
400 
401 static bool checkOpenCLSubgroupExt(Sema &S, CallExpr *Call) {
402   if (!S.getOpenCLOptions().isEnabled("cl_khr_subgroups")) {
403     S.Diag(Call->getBeginLoc(), diag::err_opencl_requires_extension)
404         << 1 << Call->getDirectCallee() << "cl_khr_subgroups";
405     return true;
406   }
407   return false;
408 }
409 
410 static bool SemaOpenCLBuiltinNDRangeAndBlock(Sema &S, CallExpr *TheCall) {
411   if (checkArgCount(S, TheCall, 2))
412     return true;
413 
414   if (checkOpenCLSubgroupExt(S, TheCall))
415     return true;
416 
417   // First argument is an ndrange_t type.
418   Expr *NDRangeArg = TheCall->getArg(0);
419   if (NDRangeArg->getType().getUnqualifiedType().getAsString() != "ndrange_t") {
420     S.Diag(NDRangeArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
421         << TheCall->getDirectCallee() << "'ndrange_t'";
422     return true;
423   }
424 
425   Expr *BlockArg = TheCall->getArg(1);
426   if (!isBlockPointer(BlockArg)) {
427     S.Diag(BlockArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
428         << TheCall->getDirectCallee() << "block";
429     return true;
430   }
431   return checkOpenCLBlockArgs(S, BlockArg);
432 }
433 
434 /// OpenCL C v2.0, s6.13.17.6 - Check the argument to the
435 /// get_kernel_work_group_size
436 /// and get_kernel_preferred_work_group_size_multiple builtin functions.
437 static bool SemaOpenCLBuiltinKernelWorkGroupSize(Sema &S, CallExpr *TheCall) {
438   if (checkArgCount(S, TheCall, 1))
439     return true;
440 
441   Expr *BlockArg = TheCall->getArg(0);
442   if (!isBlockPointer(BlockArg)) {
443     S.Diag(BlockArg->getBeginLoc(), diag::err_opencl_builtin_expected_type)
444         << TheCall->getDirectCallee() << "block";
445     return true;
446   }
447   return checkOpenCLBlockArgs(S, BlockArg);
448 }
449 
450 /// Diagnose integer type and any valid implicit conversion to it.
451 static bool checkOpenCLEnqueueIntType(Sema &S, Expr *E,
452                                       const QualType &IntType);
453 
454 static bool checkOpenCLEnqueueLocalSizeArgs(Sema &S, CallExpr *TheCall,
455                                             unsigned Start, unsigned End) {
456   bool IllegalParams = false;
457   for (unsigned I = Start; I <= End; ++I)
458     IllegalParams |= checkOpenCLEnqueueIntType(S, TheCall->getArg(I),
459                                               S.Context.getSizeType());
460   return IllegalParams;
461 }
462 
463 /// OpenCL v2.0, s6.13.17.1 - Check that sizes are provided for all
464 /// 'local void*' parameter of passed block.
465 static bool checkOpenCLEnqueueVariadicArgs(Sema &S, CallExpr *TheCall,
466                                            Expr *BlockArg,
467                                            unsigned NumNonVarArgs) {
468   const BlockPointerType *BPT =
469       cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
470   unsigned NumBlockParams =
471       BPT->getPointeeType()->getAs<FunctionProtoType>()->getNumParams();
472   unsigned TotalNumArgs = TheCall->getNumArgs();
473 
474   // For each argument passed to the block, a corresponding uint needs to
475   // be passed to describe the size of the local memory.
476   if (TotalNumArgs != NumBlockParams + NumNonVarArgs) {
477     S.Diag(TheCall->getBeginLoc(),
478            diag::err_opencl_enqueue_kernel_local_size_args);
479     return true;
480   }
481 
482   // Check that the sizes of the local memory are specified by integers.
483   return checkOpenCLEnqueueLocalSizeArgs(S, TheCall, NumNonVarArgs,
484                                          TotalNumArgs - 1);
485 }
486 
487 /// OpenCL C v2.0, s6.13.17 - Enqueue kernel function contains four different
488 /// overload formats specified in Table 6.13.17.1.
489 /// int enqueue_kernel(queue_t queue,
490 ///                    kernel_enqueue_flags_t flags,
491 ///                    const ndrange_t ndrange,
492 ///                    void (^block)(void))
493 /// int enqueue_kernel(queue_t queue,
494 ///                    kernel_enqueue_flags_t flags,
495 ///                    const ndrange_t ndrange,
496 ///                    uint num_events_in_wait_list,
497 ///                    clk_event_t *event_wait_list,
498 ///                    clk_event_t *event_ret,
499 ///                    void (^block)(void))
500 /// int enqueue_kernel(queue_t queue,
501 ///                    kernel_enqueue_flags_t flags,
502 ///                    const ndrange_t ndrange,
503 ///                    void (^block)(local void*, ...),
504 ///                    uint size0, ...)
505 /// int enqueue_kernel(queue_t queue,
506 ///                    kernel_enqueue_flags_t flags,
507 ///                    const ndrange_t ndrange,
508 ///                    uint num_events_in_wait_list,
509 ///                    clk_event_t *event_wait_list,
510 ///                    clk_event_t *event_ret,
511 ///                    void (^block)(local void*, ...),
512 ///                    uint size0, ...)
513 static bool SemaOpenCLBuiltinEnqueueKernel(Sema &S, CallExpr *TheCall) {
514   unsigned NumArgs = TheCall->getNumArgs();
515 
516   if (NumArgs < 4) {
517     S.Diag(TheCall->getBeginLoc(), diag::err_typecheck_call_too_few_args);
518     return true;
519   }
520 
521   Expr *Arg0 = TheCall->getArg(0);
522   Expr *Arg1 = TheCall->getArg(1);
523   Expr *Arg2 = TheCall->getArg(2);
524   Expr *Arg3 = TheCall->getArg(3);
525 
526   // First argument always needs to be a queue_t type.
527   if (!Arg0->getType()->isQueueT()) {
528     S.Diag(TheCall->getArg(0)->getBeginLoc(),
529            diag::err_opencl_builtin_expected_type)
530         << TheCall->getDirectCallee() << S.Context.OCLQueueTy;
531     return true;
532   }
533 
534   // Second argument always needs to be a kernel_enqueue_flags_t enum value.
535   if (!Arg1->getType()->isIntegerType()) {
536     S.Diag(TheCall->getArg(1)->getBeginLoc(),
537            diag::err_opencl_builtin_expected_type)
538         << TheCall->getDirectCallee() << "'kernel_enqueue_flags_t' (i.e. uint)";
539     return true;
540   }
541 
542   // Third argument is always an ndrange_t type.
543   if (Arg2->getType().getUnqualifiedType().getAsString() != "ndrange_t") {
544     S.Diag(TheCall->getArg(2)->getBeginLoc(),
545            diag::err_opencl_builtin_expected_type)
546         << TheCall->getDirectCallee() << "'ndrange_t'";
547     return true;
548   }
549 
550   // With four arguments, there is only one form that the function could be
551   // called in: no events and no variable arguments.
552   if (NumArgs == 4) {
553     // check that the last argument is the right block type.
554     if (!isBlockPointer(Arg3)) {
555       S.Diag(Arg3->getBeginLoc(), diag::err_opencl_builtin_expected_type)
556           << TheCall->getDirectCallee() << "block";
557       return true;
558     }
559     // we have a block type, check the prototype
560     const BlockPointerType *BPT =
561         cast<BlockPointerType>(Arg3->getType().getCanonicalType());
562     if (BPT->getPointeeType()->getAs<FunctionProtoType>()->getNumParams() > 0) {
563       S.Diag(Arg3->getBeginLoc(),
564              diag::err_opencl_enqueue_kernel_blocks_no_args);
565       return true;
566     }
567     return false;
568   }
569   // we can have block + varargs.
570   if (isBlockPointer(Arg3))
571     return (checkOpenCLBlockArgs(S, Arg3) ||
572             checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg3, 4));
573   // last two cases with either exactly 7 args or 7 args and varargs.
574   if (NumArgs >= 7) {
575     // check common block argument.
576     Expr *Arg6 = TheCall->getArg(6);
577     if (!isBlockPointer(Arg6)) {
578       S.Diag(Arg6->getBeginLoc(), diag::err_opencl_builtin_expected_type)
579           << TheCall->getDirectCallee() << "block";
580       return true;
581     }
582     if (checkOpenCLBlockArgs(S, Arg6))
583       return true;
584 
585     // Forth argument has to be any integer type.
586     if (!Arg3->getType()->isIntegerType()) {
587       S.Diag(TheCall->getArg(3)->getBeginLoc(),
588              diag::err_opencl_builtin_expected_type)
589           << TheCall->getDirectCallee() << "integer";
590       return true;
591     }
592     // check remaining common arguments.
593     Expr *Arg4 = TheCall->getArg(4);
594     Expr *Arg5 = TheCall->getArg(5);
595 
596     // Fifth argument is always passed as a pointer to clk_event_t.
597     if (!Arg4->isNullPointerConstant(S.Context,
598                                      Expr::NPC_ValueDependentIsNotNull) &&
599         !Arg4->getType()->getPointeeOrArrayElementType()->isClkEventT()) {
600       S.Diag(TheCall->getArg(4)->getBeginLoc(),
601              diag::err_opencl_builtin_expected_type)
602           << TheCall->getDirectCallee()
603           << S.Context.getPointerType(S.Context.OCLClkEventTy);
604       return true;
605     }
606 
607     // Sixth argument is always passed as a pointer to clk_event_t.
608     if (!Arg5->isNullPointerConstant(S.Context,
609                                      Expr::NPC_ValueDependentIsNotNull) &&
610         !(Arg5->getType()->isPointerType() &&
611           Arg5->getType()->getPointeeType()->isClkEventT())) {
612       S.Diag(TheCall->getArg(5)->getBeginLoc(),
613              diag::err_opencl_builtin_expected_type)
614           << TheCall->getDirectCallee()
615           << S.Context.getPointerType(S.Context.OCLClkEventTy);
616       return true;
617     }
618 
619     if (NumArgs == 7)
620       return false;
621 
622     return checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg6, 7);
623   }
624 
625   // None of the specific case has been detected, give generic error
626   S.Diag(TheCall->getBeginLoc(),
627          diag::err_opencl_enqueue_kernel_incorrect_args);
628   return true;
629 }
630 
631 /// Returns OpenCL access qual.
632 static OpenCLAccessAttr *getOpenCLArgAccess(const Decl *D) {
633     return D->getAttr<OpenCLAccessAttr>();
634 }
635 
636 /// Returns true if pipe element type is different from the pointer.
637 static bool checkOpenCLPipeArg(Sema &S, CallExpr *Call) {
638   const Expr *Arg0 = Call->getArg(0);
639   // First argument type should always be pipe.
640   if (!Arg0->getType()->isPipeType()) {
641     S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_first_arg)
642         << Call->getDirectCallee() << Arg0->getSourceRange();
643     return true;
644   }
645   OpenCLAccessAttr *AccessQual =
646       getOpenCLArgAccess(cast<DeclRefExpr>(Arg0)->getDecl());
647   // Validates the access qualifier is compatible with the call.
648   // OpenCL v2.0 s6.13.16 - The access qualifiers for pipe should only be
649   // read_only and write_only, and assumed to be read_only if no qualifier is
650   // specified.
651   switch (Call->getDirectCallee()->getBuiltinID()) {
652   case Builtin::BIread_pipe:
653   case Builtin::BIreserve_read_pipe:
654   case Builtin::BIcommit_read_pipe:
655   case Builtin::BIwork_group_reserve_read_pipe:
656   case Builtin::BIsub_group_reserve_read_pipe:
657   case Builtin::BIwork_group_commit_read_pipe:
658   case Builtin::BIsub_group_commit_read_pipe:
659     if (!(!AccessQual || AccessQual->isReadOnly())) {
660       S.Diag(Arg0->getBeginLoc(),
661              diag::err_opencl_builtin_pipe_invalid_access_modifier)
662           << "read_only" << Arg0->getSourceRange();
663       return true;
664     }
665     break;
666   case Builtin::BIwrite_pipe:
667   case Builtin::BIreserve_write_pipe:
668   case Builtin::BIcommit_write_pipe:
669   case Builtin::BIwork_group_reserve_write_pipe:
670   case Builtin::BIsub_group_reserve_write_pipe:
671   case Builtin::BIwork_group_commit_write_pipe:
672   case Builtin::BIsub_group_commit_write_pipe:
673     if (!(AccessQual && AccessQual->isWriteOnly())) {
674       S.Diag(Arg0->getBeginLoc(),
675              diag::err_opencl_builtin_pipe_invalid_access_modifier)
676           << "write_only" << Arg0->getSourceRange();
677       return true;
678     }
679     break;
680   default:
681     break;
682   }
683   return false;
684 }
685 
686 /// Returns true if pipe element type is different from the pointer.
687 static bool checkOpenCLPipePacketType(Sema &S, CallExpr *Call, unsigned Idx) {
688   const Expr *Arg0 = Call->getArg(0);
689   const Expr *ArgIdx = Call->getArg(Idx);
690   const PipeType *PipeTy = cast<PipeType>(Arg0->getType());
691   const QualType EltTy = PipeTy->getElementType();
692   const PointerType *ArgTy = ArgIdx->getType()->getAs<PointerType>();
693   // The Idx argument should be a pointer and the type of the pointer and
694   // the type of pipe element should also be the same.
695   if (!ArgTy ||
696       !S.Context.hasSameType(
697           EltTy, ArgTy->getPointeeType()->getCanonicalTypeInternal())) {
698     S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
699         << Call->getDirectCallee() << S.Context.getPointerType(EltTy)
700         << ArgIdx->getType() << ArgIdx->getSourceRange();
701     return true;
702   }
703   return false;
704 }
705 
706 // Performs semantic analysis for the read/write_pipe call.
707 // \param S Reference to the semantic analyzer.
708 // \param Call A pointer to the builtin call.
709 // \return True if a semantic error has been found, false otherwise.
710 static bool SemaBuiltinRWPipe(Sema &S, CallExpr *Call) {
711   // OpenCL v2.0 s6.13.16.2 - The built-in read/write
712   // functions have two forms.
713   switch (Call->getNumArgs()) {
714   case 2:
715     if (checkOpenCLPipeArg(S, Call))
716       return true;
717     // The call with 2 arguments should be
718     // read/write_pipe(pipe T, T*).
719     // Check packet type T.
720     if (checkOpenCLPipePacketType(S, Call, 1))
721       return true;
722     break;
723 
724   case 4: {
725     if (checkOpenCLPipeArg(S, Call))
726       return true;
727     // The call with 4 arguments should be
728     // read/write_pipe(pipe T, reserve_id_t, uint, T*).
729     // Check reserve_id_t.
730     if (!Call->getArg(1)->getType()->isReserveIDT()) {
731       S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
732           << Call->getDirectCallee() << S.Context.OCLReserveIDTy
733           << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
734       return true;
735     }
736 
737     // Check the index.
738     const Expr *Arg2 = Call->getArg(2);
739     if (!Arg2->getType()->isIntegerType() &&
740         !Arg2->getType()->isUnsignedIntegerType()) {
741       S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
742           << Call->getDirectCallee() << S.Context.UnsignedIntTy
743           << Arg2->getType() << Arg2->getSourceRange();
744       return true;
745     }
746 
747     // Check packet type T.
748     if (checkOpenCLPipePacketType(S, Call, 3))
749       return true;
750   } break;
751   default:
752     S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_arg_num)
753         << Call->getDirectCallee() << Call->getSourceRange();
754     return true;
755   }
756 
757   return false;
758 }
759 
760 // Performs a semantic analysis on the {work_group_/sub_group_
761 //        /_}reserve_{read/write}_pipe
762 // \param S Reference to the semantic analyzer.
763 // \param Call The call to the builtin function to be analyzed.
764 // \return True if a semantic error was found, false otherwise.
765 static bool SemaBuiltinReserveRWPipe(Sema &S, CallExpr *Call) {
766   if (checkArgCount(S, Call, 2))
767     return true;
768 
769   if (checkOpenCLPipeArg(S, Call))
770     return true;
771 
772   // Check the reserve size.
773   if (!Call->getArg(1)->getType()->isIntegerType() &&
774       !Call->getArg(1)->getType()->isUnsignedIntegerType()) {
775     S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
776         << Call->getDirectCallee() << S.Context.UnsignedIntTy
777         << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
778     return true;
779   }
780 
781   // Since return type of reserve_read/write_pipe built-in function is
782   // reserve_id_t, which is not defined in the builtin def file , we used int
783   // as return type and need to override the return type of these functions.
784   Call->setType(S.Context.OCLReserveIDTy);
785 
786   return false;
787 }
788 
789 // Performs a semantic analysis on {work_group_/sub_group_
790 //        /_}commit_{read/write}_pipe
791 // \param S Reference to the semantic analyzer.
792 // \param Call The call to the builtin function to be analyzed.
793 // \return True if a semantic error was found, false otherwise.
794 static bool SemaBuiltinCommitRWPipe(Sema &S, CallExpr *Call) {
795   if (checkArgCount(S, Call, 2))
796     return true;
797 
798   if (checkOpenCLPipeArg(S, Call))
799     return true;
800 
801   // Check reserve_id_t.
802   if (!Call->getArg(1)->getType()->isReserveIDT()) {
803     S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_invalid_arg)
804         << Call->getDirectCallee() << S.Context.OCLReserveIDTy
805         << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
806     return true;
807   }
808 
809   return false;
810 }
811 
812 // Performs a semantic analysis on the call to built-in Pipe
813 //        Query Functions.
814 // \param S Reference to the semantic analyzer.
815 // \param Call The call to the builtin function to be analyzed.
816 // \return True if a semantic error was found, false otherwise.
817 static bool SemaBuiltinPipePackets(Sema &S, CallExpr *Call) {
818   if (checkArgCount(S, Call, 1))
819     return true;
820 
821   if (!Call->getArg(0)->getType()->isPipeType()) {
822     S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_pipe_first_arg)
823         << Call->getDirectCallee() << Call->getArg(0)->getSourceRange();
824     return true;
825   }
826 
827   return false;
828 }
829 
830 // OpenCL v2.0 s6.13.9 - Address space qualifier functions.
831 // Performs semantic analysis for the to_global/local/private call.
832 // \param S Reference to the semantic analyzer.
833 // \param BuiltinID ID of the builtin function.
834 // \param Call A pointer to the builtin call.
835 // \return True if a semantic error has been found, false otherwise.
836 static bool SemaOpenCLBuiltinToAddr(Sema &S, unsigned BuiltinID,
837                                     CallExpr *Call) {
838   if (Call->getNumArgs() != 1) {
839     S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_to_addr_arg_num)
840         << Call->getDirectCallee() << Call->getSourceRange();
841     return true;
842   }
843 
844   auto RT = Call->getArg(0)->getType();
845   if (!RT->isPointerType() || RT->getPointeeType()
846       .getAddressSpace() == LangAS::opencl_constant) {
847     S.Diag(Call->getBeginLoc(), diag::err_opencl_builtin_to_addr_invalid_arg)
848         << Call->getArg(0) << Call->getDirectCallee() << Call->getSourceRange();
849     return true;
850   }
851 
852   if (RT->getPointeeType().getAddressSpace() != LangAS::opencl_generic) {
853     S.Diag(Call->getArg(0)->getBeginLoc(),
854            diag::warn_opencl_generic_address_space_arg)
855         << Call->getDirectCallee()->getNameInfo().getAsString()
856         << Call->getArg(0)->getSourceRange();
857   }
858 
859   RT = RT->getPointeeType();
860   auto Qual = RT.getQualifiers();
861   switch (BuiltinID) {
862   case Builtin::BIto_global:
863     Qual.setAddressSpace(LangAS::opencl_global);
864     break;
865   case Builtin::BIto_local:
866     Qual.setAddressSpace(LangAS::opencl_local);
867     break;
868   case Builtin::BIto_private:
869     Qual.setAddressSpace(LangAS::opencl_private);
870     break;
871   default:
872     llvm_unreachable("Invalid builtin function");
873   }
874   Call->setType(S.Context.getPointerType(S.Context.getQualifiedType(
875       RT.getUnqualifiedType(), Qual)));
876 
877   return false;
878 }
879 
880 // Emit an error and return true if the current architecture is not in the list
881 // of supported architectures.
882 static bool
883 CheckBuiltinTargetSupport(Sema &S, unsigned BuiltinID, CallExpr *TheCall,
884                           ArrayRef<llvm::Triple::ArchType> SupportedArchs) {
885   llvm::Triple::ArchType CurArch =
886       S.getASTContext().getTargetInfo().getTriple().getArch();
887   if (llvm::is_contained(SupportedArchs, CurArch))
888     return false;
889   S.Diag(TheCall->getBeginLoc(), diag::err_builtin_target_unsupported)
890       << TheCall->getSourceRange();
891   return true;
892 }
893 
894 ExprResult
895 Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl, unsigned BuiltinID,
896                                CallExpr *TheCall) {
897   ExprResult TheCallResult(TheCall);
898 
899   // Find out if any arguments are required to be integer constant expressions.
900   unsigned ICEArguments = 0;
901   ASTContext::GetBuiltinTypeError Error;
902   Context.GetBuiltinType(BuiltinID, Error, &ICEArguments);
903   if (Error != ASTContext::GE_None)
904     ICEArguments = 0;  // Don't diagnose previously diagnosed errors.
905 
906   // If any arguments are required to be ICE's, check and diagnose.
907   for (unsigned ArgNo = 0; ICEArguments != 0; ++ArgNo) {
908     // Skip arguments not required to be ICE's.
909     if ((ICEArguments & (1 << ArgNo)) == 0) continue;
910 
911     llvm::APSInt Result;
912     if (SemaBuiltinConstantArg(TheCall, ArgNo, Result))
913       return true;
914     ICEArguments &= ~(1 << ArgNo);
915   }
916 
917   switch (BuiltinID) {
918   case Builtin::BI__builtin___CFStringMakeConstantString:
919     assert(TheCall->getNumArgs() == 1 &&
920            "Wrong # arguments to builtin CFStringMakeConstantString");
921     if (CheckObjCString(TheCall->getArg(0)))
922       return ExprError();
923     break;
924   case Builtin::BI__builtin_ms_va_start:
925   case Builtin::BI__builtin_stdarg_start:
926   case Builtin::BI__builtin_va_start:
927     if (SemaBuiltinVAStart(BuiltinID, TheCall))
928       return ExprError();
929     break;
930   case Builtin::BI__va_start: {
931     switch (Context.getTargetInfo().getTriple().getArch()) {
932     case llvm::Triple::aarch64:
933     case llvm::Triple::arm:
934     case llvm::Triple::thumb:
935       if (SemaBuiltinVAStartARMMicrosoft(TheCall))
936         return ExprError();
937       break;
938     default:
939       if (SemaBuiltinVAStart(BuiltinID, TheCall))
940         return ExprError();
941       break;
942     }
943     break;
944   }
945 
946   // The acquire, release, and no fence variants are ARM and AArch64 only.
947   case Builtin::BI_interlockedbittestandset_acq:
948   case Builtin::BI_interlockedbittestandset_rel:
949   case Builtin::BI_interlockedbittestandset_nf:
950   case Builtin::BI_interlockedbittestandreset_acq:
951   case Builtin::BI_interlockedbittestandreset_rel:
952   case Builtin::BI_interlockedbittestandreset_nf:
953     if (CheckBuiltinTargetSupport(
954             *this, BuiltinID, TheCall,
955             {llvm::Triple::arm, llvm::Triple::thumb, llvm::Triple::aarch64}))
956       return ExprError();
957     break;
958 
959   // The 64-bit bittest variants are x64, ARM, and AArch64 only.
960   case Builtin::BI_bittest64:
961   case Builtin::BI_bittestandcomplement64:
962   case Builtin::BI_bittestandreset64:
963   case Builtin::BI_bittestandset64:
964   case Builtin::BI_interlockedbittestandreset64:
965   case Builtin::BI_interlockedbittestandset64:
966     if (CheckBuiltinTargetSupport(*this, BuiltinID, TheCall,
967                                   {llvm::Triple::x86_64, llvm::Triple::arm,
968                                    llvm::Triple::thumb, llvm::Triple::aarch64}))
969       return ExprError();
970     break;
971 
972   case Builtin::BI__builtin_isgreater:
973   case Builtin::BI__builtin_isgreaterequal:
974   case Builtin::BI__builtin_isless:
975   case Builtin::BI__builtin_islessequal:
976   case Builtin::BI__builtin_islessgreater:
977   case Builtin::BI__builtin_isunordered:
978     if (SemaBuiltinUnorderedCompare(TheCall))
979       return ExprError();
980     break;
981   case Builtin::BI__builtin_fpclassify:
982     if (SemaBuiltinFPClassification(TheCall, 6))
983       return ExprError();
984     break;
985   case Builtin::BI__builtin_isfinite:
986   case Builtin::BI__builtin_isinf:
987   case Builtin::BI__builtin_isinf_sign:
988   case Builtin::BI__builtin_isnan:
989   case Builtin::BI__builtin_isnormal:
990   case Builtin::BI__builtin_signbit:
991   case Builtin::BI__builtin_signbitf:
992   case Builtin::BI__builtin_signbitl:
993     if (SemaBuiltinFPClassification(TheCall, 1))
994       return ExprError();
995     break;
996   case Builtin::BI__builtin_shufflevector:
997     return SemaBuiltinShuffleVector(TheCall);
998     // TheCall will be freed by the smart pointer here, but that's fine, since
999     // SemaBuiltinShuffleVector guts it, but then doesn't release it.
1000   case Builtin::BI__builtin_prefetch:
1001     if (SemaBuiltinPrefetch(TheCall))
1002       return ExprError();
1003     break;
1004   case Builtin::BI__builtin_alloca_with_align:
1005     if (SemaBuiltinAllocaWithAlign(TheCall))
1006       return ExprError();
1007     break;
1008   case Builtin::BI__assume:
1009   case Builtin::BI__builtin_assume:
1010     if (SemaBuiltinAssume(TheCall))
1011       return ExprError();
1012     break;
1013   case Builtin::BI__builtin_assume_aligned:
1014     if (SemaBuiltinAssumeAligned(TheCall))
1015       return ExprError();
1016     break;
1017   case Builtin::BI__builtin_object_size:
1018     if (SemaBuiltinConstantArgRange(TheCall, 1, 0, 3))
1019       return ExprError();
1020     break;
1021   case Builtin::BI__builtin_longjmp:
1022     if (SemaBuiltinLongjmp(TheCall))
1023       return ExprError();
1024     break;
1025   case Builtin::BI__builtin_setjmp:
1026     if (SemaBuiltinSetjmp(TheCall))
1027       return ExprError();
1028     break;
1029   case Builtin::BI_setjmp:
1030   case Builtin::BI_setjmpex:
1031     if (checkArgCount(*this, TheCall, 1))
1032       return true;
1033     break;
1034   case Builtin::BI__builtin_classify_type:
1035     if (checkArgCount(*this, TheCall, 1)) return true;
1036     TheCall->setType(Context.IntTy);
1037     break;
1038   case Builtin::BI__builtin_constant_p:
1039     if (checkArgCount(*this, TheCall, 1)) return true;
1040     TheCall->setType(Context.IntTy);
1041     break;
1042   case Builtin::BI__sync_fetch_and_add:
1043   case Builtin::BI__sync_fetch_and_add_1:
1044   case Builtin::BI__sync_fetch_and_add_2:
1045   case Builtin::BI__sync_fetch_and_add_4:
1046   case Builtin::BI__sync_fetch_and_add_8:
1047   case Builtin::BI__sync_fetch_and_add_16:
1048   case Builtin::BI__sync_fetch_and_sub:
1049   case Builtin::BI__sync_fetch_and_sub_1:
1050   case Builtin::BI__sync_fetch_and_sub_2:
1051   case Builtin::BI__sync_fetch_and_sub_4:
1052   case Builtin::BI__sync_fetch_and_sub_8:
1053   case Builtin::BI__sync_fetch_and_sub_16:
1054   case Builtin::BI__sync_fetch_and_or:
1055   case Builtin::BI__sync_fetch_and_or_1:
1056   case Builtin::BI__sync_fetch_and_or_2:
1057   case Builtin::BI__sync_fetch_and_or_4:
1058   case Builtin::BI__sync_fetch_and_or_8:
1059   case Builtin::BI__sync_fetch_and_or_16:
1060   case Builtin::BI__sync_fetch_and_and:
1061   case Builtin::BI__sync_fetch_and_and_1:
1062   case Builtin::BI__sync_fetch_and_and_2:
1063   case Builtin::BI__sync_fetch_and_and_4:
1064   case Builtin::BI__sync_fetch_and_and_8:
1065   case Builtin::BI__sync_fetch_and_and_16:
1066   case Builtin::BI__sync_fetch_and_xor:
1067   case Builtin::BI__sync_fetch_and_xor_1:
1068   case Builtin::BI__sync_fetch_and_xor_2:
1069   case Builtin::BI__sync_fetch_and_xor_4:
1070   case Builtin::BI__sync_fetch_and_xor_8:
1071   case Builtin::BI__sync_fetch_and_xor_16:
1072   case Builtin::BI__sync_fetch_and_nand:
1073   case Builtin::BI__sync_fetch_and_nand_1:
1074   case Builtin::BI__sync_fetch_and_nand_2:
1075   case Builtin::BI__sync_fetch_and_nand_4:
1076   case Builtin::BI__sync_fetch_and_nand_8:
1077   case Builtin::BI__sync_fetch_and_nand_16:
1078   case Builtin::BI__sync_add_and_fetch:
1079   case Builtin::BI__sync_add_and_fetch_1:
1080   case Builtin::BI__sync_add_and_fetch_2:
1081   case Builtin::BI__sync_add_and_fetch_4:
1082   case Builtin::BI__sync_add_and_fetch_8:
1083   case Builtin::BI__sync_add_and_fetch_16:
1084   case Builtin::BI__sync_sub_and_fetch:
1085   case Builtin::BI__sync_sub_and_fetch_1:
1086   case Builtin::BI__sync_sub_and_fetch_2:
1087   case Builtin::BI__sync_sub_and_fetch_4:
1088   case Builtin::BI__sync_sub_and_fetch_8:
1089   case Builtin::BI__sync_sub_and_fetch_16:
1090   case Builtin::BI__sync_and_and_fetch:
1091   case Builtin::BI__sync_and_and_fetch_1:
1092   case Builtin::BI__sync_and_and_fetch_2:
1093   case Builtin::BI__sync_and_and_fetch_4:
1094   case Builtin::BI__sync_and_and_fetch_8:
1095   case Builtin::BI__sync_and_and_fetch_16:
1096   case Builtin::BI__sync_or_and_fetch:
1097   case Builtin::BI__sync_or_and_fetch_1:
1098   case Builtin::BI__sync_or_and_fetch_2:
1099   case Builtin::BI__sync_or_and_fetch_4:
1100   case Builtin::BI__sync_or_and_fetch_8:
1101   case Builtin::BI__sync_or_and_fetch_16:
1102   case Builtin::BI__sync_xor_and_fetch:
1103   case Builtin::BI__sync_xor_and_fetch_1:
1104   case Builtin::BI__sync_xor_and_fetch_2:
1105   case Builtin::BI__sync_xor_and_fetch_4:
1106   case Builtin::BI__sync_xor_and_fetch_8:
1107   case Builtin::BI__sync_xor_and_fetch_16:
1108   case Builtin::BI__sync_nand_and_fetch:
1109   case Builtin::BI__sync_nand_and_fetch_1:
1110   case Builtin::BI__sync_nand_and_fetch_2:
1111   case Builtin::BI__sync_nand_and_fetch_4:
1112   case Builtin::BI__sync_nand_and_fetch_8:
1113   case Builtin::BI__sync_nand_and_fetch_16:
1114   case Builtin::BI__sync_val_compare_and_swap:
1115   case Builtin::BI__sync_val_compare_and_swap_1:
1116   case Builtin::BI__sync_val_compare_and_swap_2:
1117   case Builtin::BI__sync_val_compare_and_swap_4:
1118   case Builtin::BI__sync_val_compare_and_swap_8:
1119   case Builtin::BI__sync_val_compare_and_swap_16:
1120   case Builtin::BI__sync_bool_compare_and_swap:
1121   case Builtin::BI__sync_bool_compare_and_swap_1:
1122   case Builtin::BI__sync_bool_compare_and_swap_2:
1123   case Builtin::BI__sync_bool_compare_and_swap_4:
1124   case Builtin::BI__sync_bool_compare_and_swap_8:
1125   case Builtin::BI__sync_bool_compare_and_swap_16:
1126   case Builtin::BI__sync_lock_test_and_set:
1127   case Builtin::BI__sync_lock_test_and_set_1:
1128   case Builtin::BI__sync_lock_test_and_set_2:
1129   case Builtin::BI__sync_lock_test_and_set_4:
1130   case Builtin::BI__sync_lock_test_and_set_8:
1131   case Builtin::BI__sync_lock_test_and_set_16:
1132   case Builtin::BI__sync_lock_release:
1133   case Builtin::BI__sync_lock_release_1:
1134   case Builtin::BI__sync_lock_release_2:
1135   case Builtin::BI__sync_lock_release_4:
1136   case Builtin::BI__sync_lock_release_8:
1137   case Builtin::BI__sync_lock_release_16:
1138   case Builtin::BI__sync_swap:
1139   case Builtin::BI__sync_swap_1:
1140   case Builtin::BI__sync_swap_2:
1141   case Builtin::BI__sync_swap_4:
1142   case Builtin::BI__sync_swap_8:
1143   case Builtin::BI__sync_swap_16:
1144     return SemaBuiltinAtomicOverloaded(TheCallResult);
1145   case Builtin::BI__sync_synchronize:
1146     Diag(TheCall->getBeginLoc(), diag::warn_atomic_implicit_seq_cst)
1147         << TheCall->getCallee()->getSourceRange();
1148     break;
1149   case Builtin::BI__builtin_nontemporal_load:
1150   case Builtin::BI__builtin_nontemporal_store:
1151     return SemaBuiltinNontemporalOverloaded(TheCallResult);
1152 #define BUILTIN(ID, TYPE, ATTRS)
1153 #define ATOMIC_BUILTIN(ID, TYPE, ATTRS) \
1154   case Builtin::BI##ID: \
1155     return SemaAtomicOpsOverloaded(TheCallResult, AtomicExpr::AO##ID);
1156 #include "clang/Basic/Builtins.def"
1157   case Builtin::BI__annotation:
1158     if (SemaBuiltinMSVCAnnotation(*this, TheCall))
1159       return ExprError();
1160     break;
1161   case Builtin::BI__builtin_annotation:
1162     if (SemaBuiltinAnnotation(*this, TheCall))
1163       return ExprError();
1164     break;
1165   case Builtin::BI__builtin_addressof:
1166     if (SemaBuiltinAddressof(*this, TheCall))
1167       return ExprError();
1168     break;
1169   case Builtin::BI__builtin_add_overflow:
1170   case Builtin::BI__builtin_sub_overflow:
1171   case Builtin::BI__builtin_mul_overflow:
1172     if (SemaBuiltinOverflow(*this, TheCall))
1173       return ExprError();
1174     break;
1175   case Builtin::BI__builtin_operator_new:
1176   case Builtin::BI__builtin_operator_delete: {
1177     bool IsDelete = BuiltinID == Builtin::BI__builtin_operator_delete;
1178     ExprResult Res =
1179         SemaBuiltinOperatorNewDeleteOverloaded(TheCallResult, IsDelete);
1180     if (Res.isInvalid())
1181       CorrectDelayedTyposInExpr(TheCallResult.get());
1182     return Res;
1183   }
1184   case Builtin::BI__builtin_dump_struct: {
1185     // We first want to ensure we are called with 2 arguments
1186     if (checkArgCount(*this, TheCall, 2))
1187       return ExprError();
1188     // Ensure that the first argument is of type 'struct XX *'
1189     const Expr *PtrArg = TheCall->getArg(0)->IgnoreParenImpCasts();
1190     const QualType PtrArgType = PtrArg->getType();
1191     if (!PtrArgType->isPointerType() ||
1192         !PtrArgType->getPointeeType()->isRecordType()) {
1193       Diag(PtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
1194           << PtrArgType << "structure pointer" << 1 << 0 << 3 << 1 << PtrArgType
1195           << "structure pointer";
1196       return ExprError();
1197     }
1198 
1199     // Ensure that the second argument is of type 'FunctionType'
1200     const Expr *FnPtrArg = TheCall->getArg(1)->IgnoreImpCasts();
1201     const QualType FnPtrArgType = FnPtrArg->getType();
1202     if (!FnPtrArgType->isPointerType()) {
1203       Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
1204           << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3 << 2
1205           << FnPtrArgType << "'int (*)(const char *, ...)'";
1206       return ExprError();
1207     }
1208 
1209     const auto *FuncType =
1210         FnPtrArgType->getPointeeType()->getAs<FunctionType>();
1211 
1212     if (!FuncType) {
1213       Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
1214           << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3 << 2
1215           << FnPtrArgType << "'int (*)(const char *, ...)'";
1216       return ExprError();
1217     }
1218 
1219     if (const auto *FT = dyn_cast<FunctionProtoType>(FuncType)) {
1220       if (!FT->getNumParams()) {
1221         Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
1222             << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3
1223             << 2 << FnPtrArgType << "'int (*)(const char *, ...)'";
1224         return ExprError();
1225       }
1226       QualType PT = FT->getParamType(0);
1227       if (!FT->isVariadic() || FT->getReturnType() != Context.IntTy ||
1228           !PT->isPointerType() || !PT->getPointeeType()->isCharType() ||
1229           !PT->getPointeeType().isConstQualified()) {
1230         Diag(FnPtrArg->getBeginLoc(), diag::err_typecheck_convert_incompatible)
1231             << FnPtrArgType << "'int (*)(const char *, ...)'" << 1 << 0 << 3
1232             << 2 << FnPtrArgType << "'int (*)(const char *, ...)'";
1233         return ExprError();
1234       }
1235     }
1236 
1237     TheCall->setType(Context.IntTy);
1238     break;
1239   }
1240 
1241   // check secure string manipulation functions where overflows
1242   // are detectable at compile time
1243   case Builtin::BI__builtin___memcpy_chk:
1244     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 2, 3, "memcpy");
1245     break;
1246   case Builtin::BI__builtin___memmove_chk:
1247     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 2, 3, "memmove");
1248     break;
1249   case Builtin::BI__builtin___memset_chk:
1250     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 2, 3, "memset");
1251     break;
1252   case Builtin::BI__builtin___strlcat_chk:
1253     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 2, 3, "strlcat");
1254     break;
1255   case Builtin::BI__builtin___strlcpy_chk:
1256     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 2, 3, "strlcpy");
1257     break;
1258   case Builtin::BI__builtin___strncat_chk:
1259     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 2, 3, "strncat");
1260     break;
1261   case Builtin::BI__builtin___strncpy_chk:
1262     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 2, 3, "strncpy");
1263     break;
1264   case Builtin::BI__builtin___stpncpy_chk:
1265     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 2, 3, "stpncpy");
1266     break;
1267   case Builtin::BI__builtin___memccpy_chk:
1268     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 3, 4, "memccpy");
1269     break;
1270   case Builtin::BI__builtin___snprintf_chk:
1271     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 1, 3, "snprintf");
1272     break;
1273   case Builtin::BI__builtin___vsnprintf_chk:
1274     SemaBuiltinMemChkCall(*this, FDecl, TheCall, 1, 3, "vsnprintf");
1275     break;
1276   case Builtin::BI__builtin_call_with_static_chain:
1277     if (SemaBuiltinCallWithStaticChain(*this, TheCall))
1278       return ExprError();
1279     break;
1280   case Builtin::BI__exception_code:
1281   case Builtin::BI_exception_code:
1282     if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHExceptScope,
1283                                  diag::err_seh___except_block))
1284       return ExprError();
1285     break;
1286   case Builtin::BI__exception_info:
1287   case Builtin::BI_exception_info:
1288     if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHFilterScope,
1289                                  diag::err_seh___except_filter))
1290       return ExprError();
1291     break;
1292   case Builtin::BI__GetExceptionInfo:
1293     if (checkArgCount(*this, TheCall, 1))
1294       return ExprError();
1295 
1296     if (CheckCXXThrowOperand(
1297             TheCall->getBeginLoc(),
1298             Context.getExceptionObjectType(FDecl->getParamDecl(0)->getType()),
1299             TheCall))
1300       return ExprError();
1301 
1302     TheCall->setType(Context.VoidPtrTy);
1303     break;
1304   // OpenCL v2.0, s6.13.16 - Pipe functions
1305   case Builtin::BIread_pipe:
1306   case Builtin::BIwrite_pipe:
1307     // Since those two functions are declared with var args, we need a semantic
1308     // check for the argument.
1309     if (SemaBuiltinRWPipe(*this, TheCall))
1310       return ExprError();
1311     TheCall->setType(Context.IntTy);
1312     break;
1313   case Builtin::BIreserve_read_pipe:
1314   case Builtin::BIreserve_write_pipe:
1315   case Builtin::BIwork_group_reserve_read_pipe:
1316   case Builtin::BIwork_group_reserve_write_pipe:
1317     if (SemaBuiltinReserveRWPipe(*this, TheCall))
1318       return ExprError();
1319     break;
1320   case Builtin::BIsub_group_reserve_read_pipe:
1321   case Builtin::BIsub_group_reserve_write_pipe:
1322     if (checkOpenCLSubgroupExt(*this, TheCall) ||
1323         SemaBuiltinReserveRWPipe(*this, TheCall))
1324       return ExprError();
1325     break;
1326   case Builtin::BIcommit_read_pipe:
1327   case Builtin::BIcommit_write_pipe:
1328   case Builtin::BIwork_group_commit_read_pipe:
1329   case Builtin::BIwork_group_commit_write_pipe:
1330     if (SemaBuiltinCommitRWPipe(*this, TheCall))
1331       return ExprError();
1332     break;
1333   case Builtin::BIsub_group_commit_read_pipe:
1334   case Builtin::BIsub_group_commit_write_pipe:
1335     if (checkOpenCLSubgroupExt(*this, TheCall) ||
1336         SemaBuiltinCommitRWPipe(*this, TheCall))
1337       return ExprError();
1338     break;
1339   case Builtin::BIget_pipe_num_packets:
1340   case Builtin::BIget_pipe_max_packets:
1341     if (SemaBuiltinPipePackets(*this, TheCall))
1342       return ExprError();
1343     TheCall->setType(Context.UnsignedIntTy);
1344     break;
1345   case Builtin::BIto_global:
1346   case Builtin::BIto_local:
1347   case Builtin::BIto_private:
1348     if (SemaOpenCLBuiltinToAddr(*this, BuiltinID, TheCall))
1349       return ExprError();
1350     break;
1351   // OpenCL v2.0, s6.13.17 - Enqueue kernel functions.
1352   case Builtin::BIenqueue_kernel:
1353     if (SemaOpenCLBuiltinEnqueueKernel(*this, TheCall))
1354       return ExprError();
1355     break;
1356   case Builtin::BIget_kernel_work_group_size:
1357   case Builtin::BIget_kernel_preferred_work_group_size_multiple:
1358     if (SemaOpenCLBuiltinKernelWorkGroupSize(*this, TheCall))
1359       return ExprError();
1360     break;
1361   case Builtin::BIget_kernel_max_sub_group_size_for_ndrange:
1362   case Builtin::BIget_kernel_sub_group_count_for_ndrange:
1363     if (SemaOpenCLBuiltinNDRangeAndBlock(*this, TheCall))
1364       return ExprError();
1365     break;
1366   case Builtin::BI__builtin_os_log_format:
1367   case Builtin::BI__builtin_os_log_format_buffer_size:
1368     if (SemaBuiltinOSLogFormat(TheCall))
1369       return ExprError();
1370     break;
1371   }
1372 
1373   // Since the target specific builtins for each arch overlap, only check those
1374   // of the arch we are compiling for.
1375   if (Context.BuiltinInfo.isTSBuiltin(BuiltinID)) {
1376     switch (Context.getTargetInfo().getTriple().getArch()) {
1377       case llvm::Triple::arm:
1378       case llvm::Triple::armeb:
1379       case llvm::Triple::thumb:
1380       case llvm::Triple::thumbeb:
1381         if (CheckARMBuiltinFunctionCall(BuiltinID, TheCall))
1382           return ExprError();
1383         break;
1384       case llvm::Triple::aarch64:
1385       case llvm::Triple::aarch64_be:
1386         if (CheckAArch64BuiltinFunctionCall(BuiltinID, TheCall))
1387           return ExprError();
1388         break;
1389       case llvm::Triple::hexagon:
1390         if (CheckHexagonBuiltinFunctionCall(BuiltinID, TheCall))
1391           return ExprError();
1392         break;
1393       case llvm::Triple::mips:
1394       case llvm::Triple::mipsel:
1395       case llvm::Triple::mips64:
1396       case llvm::Triple::mips64el:
1397         if (CheckMipsBuiltinFunctionCall(BuiltinID, TheCall))
1398           return ExprError();
1399         break;
1400       case llvm::Triple::systemz:
1401         if (CheckSystemZBuiltinFunctionCall(BuiltinID, TheCall))
1402           return ExprError();
1403         break;
1404       case llvm::Triple::x86:
1405       case llvm::Triple::x86_64:
1406         if (CheckX86BuiltinFunctionCall(BuiltinID, TheCall))
1407           return ExprError();
1408         break;
1409       case llvm::Triple::ppc:
1410       case llvm::Triple::ppc64:
1411       case llvm::Triple::ppc64le:
1412         if (CheckPPCBuiltinFunctionCall(BuiltinID, TheCall))
1413           return ExprError();
1414         break;
1415       default:
1416         break;
1417     }
1418   }
1419 
1420   return TheCallResult;
1421 }
1422 
1423 // Get the valid immediate range for the specified NEON type code.
1424 static unsigned RFT(unsigned t, bool shift = false, bool ForceQuad = false) {
1425   NeonTypeFlags Type(t);
1426   int IsQuad = ForceQuad ? true : Type.isQuad();
1427   switch (Type.getEltType()) {
1428   case NeonTypeFlags::Int8:
1429   case NeonTypeFlags::Poly8:
1430     return shift ? 7 : (8 << IsQuad) - 1;
1431   case NeonTypeFlags::Int16:
1432   case NeonTypeFlags::Poly16:
1433     return shift ? 15 : (4 << IsQuad) - 1;
1434   case NeonTypeFlags::Int32:
1435     return shift ? 31 : (2 << IsQuad) - 1;
1436   case NeonTypeFlags::Int64:
1437   case NeonTypeFlags::Poly64:
1438     return shift ? 63 : (1 << IsQuad) - 1;
1439   case NeonTypeFlags::Poly128:
1440     return shift ? 127 : (1 << IsQuad) - 1;
1441   case NeonTypeFlags::Float16:
1442     assert(!shift && "cannot shift float types!");
1443     return (4 << IsQuad) - 1;
1444   case NeonTypeFlags::Float32:
1445     assert(!shift && "cannot shift float types!");
1446     return (2 << IsQuad) - 1;
1447   case NeonTypeFlags::Float64:
1448     assert(!shift && "cannot shift float types!");
1449     return (1 << IsQuad) - 1;
1450   }
1451   llvm_unreachable("Invalid NeonTypeFlag!");
1452 }
1453 
1454 /// getNeonEltType - Return the QualType corresponding to the elements of
1455 /// the vector type specified by the NeonTypeFlags.  This is used to check
1456 /// the pointer arguments for Neon load/store intrinsics.
1457 static QualType getNeonEltType(NeonTypeFlags Flags, ASTContext &Context,
1458                                bool IsPolyUnsigned, bool IsInt64Long) {
1459   switch (Flags.getEltType()) {
1460   case NeonTypeFlags::Int8:
1461     return Flags.isUnsigned() ? Context.UnsignedCharTy : Context.SignedCharTy;
1462   case NeonTypeFlags::Int16:
1463     return Flags.isUnsigned() ? Context.UnsignedShortTy : Context.ShortTy;
1464   case NeonTypeFlags::Int32:
1465     return Flags.isUnsigned() ? Context.UnsignedIntTy : Context.IntTy;
1466   case NeonTypeFlags::Int64:
1467     if (IsInt64Long)
1468       return Flags.isUnsigned() ? Context.UnsignedLongTy : Context.LongTy;
1469     else
1470       return Flags.isUnsigned() ? Context.UnsignedLongLongTy
1471                                 : Context.LongLongTy;
1472   case NeonTypeFlags::Poly8:
1473     return IsPolyUnsigned ? Context.UnsignedCharTy : Context.SignedCharTy;
1474   case NeonTypeFlags::Poly16:
1475     return IsPolyUnsigned ? Context.UnsignedShortTy : Context.ShortTy;
1476   case NeonTypeFlags::Poly64:
1477     if (IsInt64Long)
1478       return Context.UnsignedLongTy;
1479     else
1480       return Context.UnsignedLongLongTy;
1481   case NeonTypeFlags::Poly128:
1482     break;
1483   case NeonTypeFlags::Float16:
1484     return Context.HalfTy;
1485   case NeonTypeFlags::Float32:
1486     return Context.FloatTy;
1487   case NeonTypeFlags::Float64:
1488     return Context.DoubleTy;
1489   }
1490   llvm_unreachable("Invalid NeonTypeFlag!");
1491 }
1492 
1493 bool Sema::CheckNeonBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
1494   llvm::APSInt Result;
1495   uint64_t mask = 0;
1496   unsigned TV = 0;
1497   int PtrArgNum = -1;
1498   bool HasConstPtr = false;
1499   switch (BuiltinID) {
1500 #define GET_NEON_OVERLOAD_CHECK
1501 #include "clang/Basic/arm_neon.inc"
1502 #include "clang/Basic/arm_fp16.inc"
1503 #undef GET_NEON_OVERLOAD_CHECK
1504   }
1505 
1506   // For NEON intrinsics which are overloaded on vector element type, validate
1507   // the immediate which specifies which variant to emit.
1508   unsigned ImmArg = TheCall->getNumArgs()-1;
1509   if (mask) {
1510     if (SemaBuiltinConstantArg(TheCall, ImmArg, Result))
1511       return true;
1512 
1513     TV = Result.getLimitedValue(64);
1514     if ((TV > 63) || (mask & (1ULL << TV)) == 0)
1515       return Diag(TheCall->getBeginLoc(), diag::err_invalid_neon_type_code)
1516              << TheCall->getArg(ImmArg)->getSourceRange();
1517   }
1518 
1519   if (PtrArgNum >= 0) {
1520     // Check that pointer arguments have the specified type.
1521     Expr *Arg = TheCall->getArg(PtrArgNum);
1522     if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Arg))
1523       Arg = ICE->getSubExpr();
1524     ExprResult RHS = DefaultFunctionArrayLvalueConversion(Arg);
1525     QualType RHSTy = RHS.get()->getType();
1526 
1527     llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
1528     bool IsPolyUnsigned = Arch == llvm::Triple::aarch64 ||
1529                           Arch == llvm::Triple::aarch64_be;
1530     bool IsInt64Long =
1531         Context.getTargetInfo().getInt64Type() == TargetInfo::SignedLong;
1532     QualType EltTy =
1533         getNeonEltType(NeonTypeFlags(TV), Context, IsPolyUnsigned, IsInt64Long);
1534     if (HasConstPtr)
1535       EltTy = EltTy.withConst();
1536     QualType LHSTy = Context.getPointerType(EltTy);
1537     AssignConvertType ConvTy;
1538     ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
1539     if (RHS.isInvalid())
1540       return true;
1541     if (DiagnoseAssignmentResult(ConvTy, Arg->getBeginLoc(), LHSTy, RHSTy,
1542                                  RHS.get(), AA_Assigning))
1543       return true;
1544   }
1545 
1546   // For NEON intrinsics which take an immediate value as part of the
1547   // instruction, range check them here.
1548   unsigned i = 0, l = 0, u = 0;
1549   switch (BuiltinID) {
1550   default:
1551     return false;
1552   #define GET_NEON_IMMEDIATE_CHECK
1553   #include "clang/Basic/arm_neon.inc"
1554   #include "clang/Basic/arm_fp16.inc"
1555   #undef GET_NEON_IMMEDIATE_CHECK
1556   }
1557 
1558   return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
1559 }
1560 
1561 bool Sema::CheckARMBuiltinExclusiveCall(unsigned BuiltinID, CallExpr *TheCall,
1562                                         unsigned MaxWidth) {
1563   assert((BuiltinID == ARM::BI__builtin_arm_ldrex ||
1564           BuiltinID == ARM::BI__builtin_arm_ldaex ||
1565           BuiltinID == ARM::BI__builtin_arm_strex ||
1566           BuiltinID == ARM::BI__builtin_arm_stlex ||
1567           BuiltinID == AArch64::BI__builtin_arm_ldrex ||
1568           BuiltinID == AArch64::BI__builtin_arm_ldaex ||
1569           BuiltinID == AArch64::BI__builtin_arm_strex ||
1570           BuiltinID == AArch64::BI__builtin_arm_stlex) &&
1571          "unexpected ARM builtin");
1572   bool IsLdrex = BuiltinID == ARM::BI__builtin_arm_ldrex ||
1573                  BuiltinID == ARM::BI__builtin_arm_ldaex ||
1574                  BuiltinID == AArch64::BI__builtin_arm_ldrex ||
1575                  BuiltinID == AArch64::BI__builtin_arm_ldaex;
1576 
1577   DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
1578 
1579   // Ensure that we have the proper number of arguments.
1580   if (checkArgCount(*this, TheCall, IsLdrex ? 1 : 2))
1581     return true;
1582 
1583   // Inspect the pointer argument of the atomic builtin.  This should always be
1584   // a pointer type, whose element is an integral scalar or pointer type.
1585   // Because it is a pointer type, we don't have to worry about any implicit
1586   // casts here.
1587   Expr *PointerArg = TheCall->getArg(IsLdrex ? 0 : 1);
1588   ExprResult PointerArgRes = DefaultFunctionArrayLvalueConversion(PointerArg);
1589   if (PointerArgRes.isInvalid())
1590     return true;
1591   PointerArg = PointerArgRes.get();
1592 
1593   const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
1594   if (!pointerType) {
1595     Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
1596         << PointerArg->getType() << PointerArg->getSourceRange();
1597     return true;
1598   }
1599 
1600   // ldrex takes a "const volatile T*" and strex takes a "volatile T*". Our next
1601   // task is to insert the appropriate casts into the AST. First work out just
1602   // what the appropriate type is.
1603   QualType ValType = pointerType->getPointeeType();
1604   QualType AddrType = ValType.getUnqualifiedType().withVolatile();
1605   if (IsLdrex)
1606     AddrType.addConst();
1607 
1608   // Issue a warning if the cast is dodgy.
1609   CastKind CastNeeded = CK_NoOp;
1610   if (!AddrType.isAtLeastAsQualifiedAs(ValType)) {
1611     CastNeeded = CK_BitCast;
1612     Diag(DRE->getBeginLoc(), diag::ext_typecheck_convert_discards_qualifiers)
1613         << PointerArg->getType() << Context.getPointerType(AddrType)
1614         << AA_Passing << PointerArg->getSourceRange();
1615   }
1616 
1617   // Finally, do the cast and replace the argument with the corrected version.
1618   AddrType = Context.getPointerType(AddrType);
1619   PointerArgRes = ImpCastExprToType(PointerArg, AddrType, CastNeeded);
1620   if (PointerArgRes.isInvalid())
1621     return true;
1622   PointerArg = PointerArgRes.get();
1623 
1624   TheCall->setArg(IsLdrex ? 0 : 1, PointerArg);
1625 
1626   // In general, we allow ints, floats and pointers to be loaded and stored.
1627   if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
1628       !ValType->isBlockPointerType() && !ValType->isFloatingType()) {
1629     Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer_intfltptr)
1630         << PointerArg->getType() << PointerArg->getSourceRange();
1631     return true;
1632   }
1633 
1634   // But ARM doesn't have instructions to deal with 128-bit versions.
1635   if (Context.getTypeSize(ValType) > MaxWidth) {
1636     assert(MaxWidth == 64 && "Diagnostic unexpectedly inaccurate");
1637     Diag(DRE->getBeginLoc(), diag::err_atomic_exclusive_builtin_pointer_size)
1638         << PointerArg->getType() << PointerArg->getSourceRange();
1639     return true;
1640   }
1641 
1642   switch (ValType.getObjCLifetime()) {
1643   case Qualifiers::OCL_None:
1644   case Qualifiers::OCL_ExplicitNone:
1645     // okay
1646     break;
1647 
1648   case Qualifiers::OCL_Weak:
1649   case Qualifiers::OCL_Strong:
1650   case Qualifiers::OCL_Autoreleasing:
1651     Diag(DRE->getBeginLoc(), diag::err_arc_atomic_ownership)
1652         << ValType << PointerArg->getSourceRange();
1653     return true;
1654   }
1655 
1656   if (IsLdrex) {
1657     TheCall->setType(ValType);
1658     return false;
1659   }
1660 
1661   // Initialize the argument to be stored.
1662   ExprResult ValArg = TheCall->getArg(0);
1663   InitializedEntity Entity = InitializedEntity::InitializeParameter(
1664       Context, ValType, /*consume*/ false);
1665   ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
1666   if (ValArg.isInvalid())
1667     return true;
1668   TheCall->setArg(0, ValArg.get());
1669 
1670   // __builtin_arm_strex always returns an int. It's marked as such in the .def,
1671   // but the custom checker bypasses all default analysis.
1672   TheCall->setType(Context.IntTy);
1673   return false;
1674 }
1675 
1676 bool Sema::CheckARMBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
1677   if (BuiltinID == ARM::BI__builtin_arm_ldrex ||
1678       BuiltinID == ARM::BI__builtin_arm_ldaex ||
1679       BuiltinID == ARM::BI__builtin_arm_strex ||
1680       BuiltinID == ARM::BI__builtin_arm_stlex) {
1681     return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 64);
1682   }
1683 
1684   if (BuiltinID == ARM::BI__builtin_arm_prefetch) {
1685     return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
1686       SemaBuiltinConstantArgRange(TheCall, 2, 0, 1);
1687   }
1688 
1689   if (BuiltinID == ARM::BI__builtin_arm_rsr64 ||
1690       BuiltinID == ARM::BI__builtin_arm_wsr64)
1691     return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 3, false);
1692 
1693   if (BuiltinID == ARM::BI__builtin_arm_rsr ||
1694       BuiltinID == ARM::BI__builtin_arm_rsrp ||
1695       BuiltinID == ARM::BI__builtin_arm_wsr ||
1696       BuiltinID == ARM::BI__builtin_arm_wsrp)
1697     return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
1698 
1699   if (CheckNeonBuiltinFunctionCall(BuiltinID, TheCall))
1700     return true;
1701 
1702   // For intrinsics which take an immediate value as part of the instruction,
1703   // range check them here.
1704   // FIXME: VFP Intrinsics should error if VFP not present.
1705   switch (BuiltinID) {
1706   default: return false;
1707   case ARM::BI__builtin_arm_ssat:
1708     return SemaBuiltinConstantArgRange(TheCall, 1, 1, 32);
1709   case ARM::BI__builtin_arm_usat:
1710     return SemaBuiltinConstantArgRange(TheCall, 1, 0, 31);
1711   case ARM::BI__builtin_arm_ssat16:
1712     return SemaBuiltinConstantArgRange(TheCall, 1, 1, 16);
1713   case ARM::BI__builtin_arm_usat16:
1714     return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
1715   case ARM::BI__builtin_arm_vcvtr_f:
1716   case ARM::BI__builtin_arm_vcvtr_d:
1717     return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
1718   case ARM::BI__builtin_arm_dmb:
1719   case ARM::BI__builtin_arm_dsb:
1720   case ARM::BI__builtin_arm_isb:
1721   case ARM::BI__builtin_arm_dbg:
1722     return SemaBuiltinConstantArgRange(TheCall, 0, 0, 15);
1723   }
1724 }
1725 
1726 bool Sema::CheckAArch64BuiltinFunctionCall(unsigned BuiltinID,
1727                                          CallExpr *TheCall) {
1728   if (BuiltinID == AArch64::BI__builtin_arm_ldrex ||
1729       BuiltinID == AArch64::BI__builtin_arm_ldaex ||
1730       BuiltinID == AArch64::BI__builtin_arm_strex ||
1731       BuiltinID == AArch64::BI__builtin_arm_stlex) {
1732     return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 128);
1733   }
1734 
1735   if (BuiltinID == AArch64::BI__builtin_arm_prefetch) {
1736     return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
1737       SemaBuiltinConstantArgRange(TheCall, 2, 0, 2) ||
1738       SemaBuiltinConstantArgRange(TheCall, 3, 0, 1) ||
1739       SemaBuiltinConstantArgRange(TheCall, 4, 0, 1);
1740   }
1741 
1742   if (BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
1743       BuiltinID == AArch64::BI__builtin_arm_wsr64)
1744     return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
1745 
1746   if (BuiltinID == AArch64::BI__builtin_arm_rsr ||
1747       BuiltinID == AArch64::BI__builtin_arm_rsrp ||
1748       BuiltinID == AArch64::BI__builtin_arm_wsr ||
1749       BuiltinID == AArch64::BI__builtin_arm_wsrp)
1750     return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
1751 
1752   if (BuiltinID == AArch64::BI__getReg)
1753     return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31);
1754 
1755   if (CheckNeonBuiltinFunctionCall(BuiltinID, TheCall))
1756     return true;
1757 
1758   // For intrinsics which take an immediate value as part of the instruction,
1759   // range check them here.
1760   unsigned i = 0, l = 0, u = 0;
1761   switch (BuiltinID) {
1762   default: return false;
1763   case AArch64::BI__builtin_arm_dmb:
1764   case AArch64::BI__builtin_arm_dsb:
1765   case AArch64::BI__builtin_arm_isb: l = 0; u = 15; break;
1766   }
1767 
1768   return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
1769 }
1770 
1771 bool Sema::CheckHexagonBuiltinCpu(unsigned BuiltinID, CallExpr *TheCall) {
1772   static const std::map<unsigned, std::vector<StringRef>> ValidCPU = {
1773     { Hexagon::BI__builtin_HEXAGON_A6_vcmpbeq_notany, {"v65"} },
1774     { Hexagon::BI__builtin_HEXAGON_A6_vminub_RdP, {"v62", "v65"} },
1775     { Hexagon::BI__builtin_HEXAGON_M6_vabsdiffb, {"v62", "v65"} },
1776     { Hexagon::BI__builtin_HEXAGON_M6_vabsdiffub, {"v62", "v65"} },
1777     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_acc, {"v60", "v62", "v65"} },
1778     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_and, {"v60", "v62", "v65"} },
1779     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_nac, {"v60", "v62", "v65"} },
1780     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_or, {"v60", "v62", "v65"} },
1781     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p, {"v60", "v62", "v65"} },
1782     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_xacc, {"v60", "v62", "v65"} },
1783     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_acc, {"v60", "v62", "v65"} },
1784     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_and, {"v60", "v62", "v65"} },
1785     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_nac, {"v60", "v62", "v65"} },
1786     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_or, {"v60", "v62", "v65"} },
1787     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r, {"v60", "v62", "v65"} },
1788     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_xacc, {"v60", "v62", "v65"} },
1789     { Hexagon::BI__builtin_HEXAGON_S6_vsplatrbp, {"v62", "v65"} },
1790     { Hexagon::BI__builtin_HEXAGON_S6_vtrunehb_ppp, {"v62", "v65"} },
1791     { Hexagon::BI__builtin_HEXAGON_S6_vtrunohb_ppp, {"v62", "v65"} },
1792   };
1793 
1794   static const std::map<unsigned, std::vector<StringRef>> ValidHVX = {
1795     { Hexagon::BI__builtin_HEXAGON_V6_extractw, {"v60", "v62", "v65"} },
1796     { Hexagon::BI__builtin_HEXAGON_V6_extractw_128B, {"v60", "v62", "v65"} },
1797     { Hexagon::BI__builtin_HEXAGON_V6_hi, {"v60", "v62", "v65"} },
1798     { Hexagon::BI__builtin_HEXAGON_V6_hi_128B, {"v60", "v62", "v65"} },
1799     { Hexagon::BI__builtin_HEXAGON_V6_lo, {"v60", "v62", "v65"} },
1800     { Hexagon::BI__builtin_HEXAGON_V6_lo_128B, {"v60", "v62", "v65"} },
1801     { Hexagon::BI__builtin_HEXAGON_V6_lvsplatb, {"v62", "v65"} },
1802     { Hexagon::BI__builtin_HEXAGON_V6_lvsplatb_128B, {"v62", "v65"} },
1803     { Hexagon::BI__builtin_HEXAGON_V6_lvsplath, {"v62", "v65"} },
1804     { Hexagon::BI__builtin_HEXAGON_V6_lvsplath_128B, {"v62", "v65"} },
1805     { Hexagon::BI__builtin_HEXAGON_V6_lvsplatw, {"v60", "v62", "v65"} },
1806     { Hexagon::BI__builtin_HEXAGON_V6_lvsplatw_128B, {"v60", "v62", "v65"} },
1807     { Hexagon::BI__builtin_HEXAGON_V6_pred_and, {"v60", "v62", "v65"} },
1808     { Hexagon::BI__builtin_HEXAGON_V6_pred_and_128B, {"v60", "v62", "v65"} },
1809     { Hexagon::BI__builtin_HEXAGON_V6_pred_and_n, {"v60", "v62", "v65"} },
1810     { Hexagon::BI__builtin_HEXAGON_V6_pred_and_n_128B, {"v60", "v62", "v65"} },
1811     { Hexagon::BI__builtin_HEXAGON_V6_pred_not, {"v60", "v62", "v65"} },
1812     { Hexagon::BI__builtin_HEXAGON_V6_pred_not_128B, {"v60", "v62", "v65"} },
1813     { Hexagon::BI__builtin_HEXAGON_V6_pred_or, {"v60", "v62", "v65"} },
1814     { Hexagon::BI__builtin_HEXAGON_V6_pred_or_128B, {"v60", "v62", "v65"} },
1815     { Hexagon::BI__builtin_HEXAGON_V6_pred_or_n, {"v60", "v62", "v65"} },
1816     { Hexagon::BI__builtin_HEXAGON_V6_pred_or_n_128B, {"v60", "v62", "v65"} },
1817     { Hexagon::BI__builtin_HEXAGON_V6_pred_scalar2, {"v60", "v62", "v65"} },
1818     { Hexagon::BI__builtin_HEXAGON_V6_pred_scalar2_128B, {"v60", "v62", "v65"} },
1819     { Hexagon::BI__builtin_HEXAGON_V6_pred_scalar2v2, {"v62", "v65"} },
1820     { Hexagon::BI__builtin_HEXAGON_V6_pred_scalar2v2_128B, {"v62", "v65"} },
1821     { Hexagon::BI__builtin_HEXAGON_V6_pred_xor, {"v60", "v62", "v65"} },
1822     { Hexagon::BI__builtin_HEXAGON_V6_pred_xor_128B, {"v60", "v62", "v65"} },
1823     { Hexagon::BI__builtin_HEXAGON_V6_shuffeqh, {"v62", "v65"} },
1824     { Hexagon::BI__builtin_HEXAGON_V6_shuffeqh_128B, {"v62", "v65"} },
1825     { Hexagon::BI__builtin_HEXAGON_V6_shuffeqw, {"v62", "v65"} },
1826     { Hexagon::BI__builtin_HEXAGON_V6_shuffeqw_128B, {"v62", "v65"} },
1827     { Hexagon::BI__builtin_HEXAGON_V6_vabsb, {"v65"} },
1828     { Hexagon::BI__builtin_HEXAGON_V6_vabsb_128B, {"v65"} },
1829     { Hexagon::BI__builtin_HEXAGON_V6_vabsb_sat, {"v65"} },
1830     { Hexagon::BI__builtin_HEXAGON_V6_vabsb_sat_128B, {"v65"} },
1831     { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffh, {"v60", "v62", "v65"} },
1832     { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffh_128B, {"v60", "v62", "v65"} },
1833     { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffub, {"v60", "v62", "v65"} },
1834     { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffub_128B, {"v60", "v62", "v65"} },
1835     { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffuh, {"v60", "v62", "v65"} },
1836     { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffuh_128B, {"v60", "v62", "v65"} },
1837     { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffw, {"v60", "v62", "v65"} },
1838     { Hexagon::BI__builtin_HEXAGON_V6_vabsdiffw_128B, {"v60", "v62", "v65"} },
1839     { Hexagon::BI__builtin_HEXAGON_V6_vabsh, {"v60", "v62", "v65"} },
1840     { Hexagon::BI__builtin_HEXAGON_V6_vabsh_128B, {"v60", "v62", "v65"} },
1841     { Hexagon::BI__builtin_HEXAGON_V6_vabsh_sat, {"v60", "v62", "v65"} },
1842     { Hexagon::BI__builtin_HEXAGON_V6_vabsh_sat_128B, {"v60", "v62", "v65"} },
1843     { Hexagon::BI__builtin_HEXAGON_V6_vabsw, {"v60", "v62", "v65"} },
1844     { Hexagon::BI__builtin_HEXAGON_V6_vabsw_128B, {"v60", "v62", "v65"} },
1845     { Hexagon::BI__builtin_HEXAGON_V6_vabsw_sat, {"v60", "v62", "v65"} },
1846     { Hexagon::BI__builtin_HEXAGON_V6_vabsw_sat_128B, {"v60", "v62", "v65"} },
1847     { Hexagon::BI__builtin_HEXAGON_V6_vaddb, {"v60", "v62", "v65"} },
1848     { Hexagon::BI__builtin_HEXAGON_V6_vaddb_128B, {"v60", "v62", "v65"} },
1849     { Hexagon::BI__builtin_HEXAGON_V6_vaddb_dv, {"v60", "v62", "v65"} },
1850     { Hexagon::BI__builtin_HEXAGON_V6_vaddb_dv_128B, {"v60", "v62", "v65"} },
1851     { Hexagon::BI__builtin_HEXAGON_V6_vaddbsat, {"v62", "v65"} },
1852     { Hexagon::BI__builtin_HEXAGON_V6_vaddbsat_128B, {"v62", "v65"} },
1853     { Hexagon::BI__builtin_HEXAGON_V6_vaddbsat_dv, {"v62", "v65"} },
1854     { Hexagon::BI__builtin_HEXAGON_V6_vaddbsat_dv_128B, {"v62", "v65"} },
1855     { Hexagon::BI__builtin_HEXAGON_V6_vaddcarry, {"v62", "v65"} },
1856     { Hexagon::BI__builtin_HEXAGON_V6_vaddcarry_128B, {"v62", "v65"} },
1857     { Hexagon::BI__builtin_HEXAGON_V6_vaddclbh, {"v62", "v65"} },
1858     { Hexagon::BI__builtin_HEXAGON_V6_vaddclbh_128B, {"v62", "v65"} },
1859     { Hexagon::BI__builtin_HEXAGON_V6_vaddclbw, {"v62", "v65"} },
1860     { Hexagon::BI__builtin_HEXAGON_V6_vaddclbw_128B, {"v62", "v65"} },
1861     { Hexagon::BI__builtin_HEXAGON_V6_vaddh, {"v60", "v62", "v65"} },
1862     { Hexagon::BI__builtin_HEXAGON_V6_vaddh_128B, {"v60", "v62", "v65"} },
1863     { Hexagon::BI__builtin_HEXAGON_V6_vaddh_dv, {"v60", "v62", "v65"} },
1864     { Hexagon::BI__builtin_HEXAGON_V6_vaddh_dv_128B, {"v60", "v62", "v65"} },
1865     { Hexagon::BI__builtin_HEXAGON_V6_vaddhsat, {"v60", "v62", "v65"} },
1866     { Hexagon::BI__builtin_HEXAGON_V6_vaddhsat_128B, {"v60", "v62", "v65"} },
1867     { Hexagon::BI__builtin_HEXAGON_V6_vaddhsat_dv, {"v60", "v62", "v65"} },
1868     { Hexagon::BI__builtin_HEXAGON_V6_vaddhsat_dv_128B, {"v60", "v62", "v65"} },
1869     { Hexagon::BI__builtin_HEXAGON_V6_vaddhw, {"v60", "v62", "v65"} },
1870     { Hexagon::BI__builtin_HEXAGON_V6_vaddhw_128B, {"v60", "v62", "v65"} },
1871     { Hexagon::BI__builtin_HEXAGON_V6_vaddhw_acc, {"v62", "v65"} },
1872     { Hexagon::BI__builtin_HEXAGON_V6_vaddhw_acc_128B, {"v62", "v65"} },
1873     { Hexagon::BI__builtin_HEXAGON_V6_vaddubh, {"v60", "v62", "v65"} },
1874     { Hexagon::BI__builtin_HEXAGON_V6_vaddubh_128B, {"v60", "v62", "v65"} },
1875     { Hexagon::BI__builtin_HEXAGON_V6_vaddubh_acc, {"v62", "v65"} },
1876     { Hexagon::BI__builtin_HEXAGON_V6_vaddubh_acc_128B, {"v62", "v65"} },
1877     { Hexagon::BI__builtin_HEXAGON_V6_vaddubsat, {"v60", "v62", "v65"} },
1878     { Hexagon::BI__builtin_HEXAGON_V6_vaddubsat_128B, {"v60", "v62", "v65"} },
1879     { Hexagon::BI__builtin_HEXAGON_V6_vaddubsat_dv, {"v60", "v62", "v65"} },
1880     { Hexagon::BI__builtin_HEXAGON_V6_vaddubsat_dv_128B, {"v60", "v62", "v65"} },
1881     { Hexagon::BI__builtin_HEXAGON_V6_vaddububb_sat, {"v62", "v65"} },
1882     { Hexagon::BI__builtin_HEXAGON_V6_vaddububb_sat_128B, {"v62", "v65"} },
1883     { Hexagon::BI__builtin_HEXAGON_V6_vadduhsat, {"v60", "v62", "v65"} },
1884     { Hexagon::BI__builtin_HEXAGON_V6_vadduhsat_128B, {"v60", "v62", "v65"} },
1885     { Hexagon::BI__builtin_HEXAGON_V6_vadduhsat_dv, {"v60", "v62", "v65"} },
1886     { Hexagon::BI__builtin_HEXAGON_V6_vadduhsat_dv_128B, {"v60", "v62", "v65"} },
1887     { Hexagon::BI__builtin_HEXAGON_V6_vadduhw, {"v60", "v62", "v65"} },
1888     { Hexagon::BI__builtin_HEXAGON_V6_vadduhw_128B, {"v60", "v62", "v65"} },
1889     { Hexagon::BI__builtin_HEXAGON_V6_vadduhw_acc, {"v62", "v65"} },
1890     { Hexagon::BI__builtin_HEXAGON_V6_vadduhw_acc_128B, {"v62", "v65"} },
1891     { Hexagon::BI__builtin_HEXAGON_V6_vadduwsat, {"v62", "v65"} },
1892     { Hexagon::BI__builtin_HEXAGON_V6_vadduwsat_128B, {"v62", "v65"} },
1893     { Hexagon::BI__builtin_HEXAGON_V6_vadduwsat_dv, {"v62", "v65"} },
1894     { Hexagon::BI__builtin_HEXAGON_V6_vadduwsat_dv_128B, {"v62", "v65"} },
1895     { Hexagon::BI__builtin_HEXAGON_V6_vaddw, {"v60", "v62", "v65"} },
1896     { Hexagon::BI__builtin_HEXAGON_V6_vaddw_128B, {"v60", "v62", "v65"} },
1897     { Hexagon::BI__builtin_HEXAGON_V6_vaddw_dv, {"v60", "v62", "v65"} },
1898     { Hexagon::BI__builtin_HEXAGON_V6_vaddw_dv_128B, {"v60", "v62", "v65"} },
1899     { Hexagon::BI__builtin_HEXAGON_V6_vaddwsat, {"v60", "v62", "v65"} },
1900     { Hexagon::BI__builtin_HEXAGON_V6_vaddwsat_128B, {"v60", "v62", "v65"} },
1901     { Hexagon::BI__builtin_HEXAGON_V6_vaddwsat_dv, {"v60", "v62", "v65"} },
1902     { Hexagon::BI__builtin_HEXAGON_V6_vaddwsat_dv_128B, {"v60", "v62", "v65"} },
1903     { Hexagon::BI__builtin_HEXAGON_V6_valignb, {"v60", "v62", "v65"} },
1904     { Hexagon::BI__builtin_HEXAGON_V6_valignb_128B, {"v60", "v62", "v65"} },
1905     { Hexagon::BI__builtin_HEXAGON_V6_valignbi, {"v60", "v62", "v65"} },
1906     { Hexagon::BI__builtin_HEXAGON_V6_valignbi_128B, {"v60", "v62", "v65"} },
1907     { Hexagon::BI__builtin_HEXAGON_V6_vand, {"v60", "v62", "v65"} },
1908     { Hexagon::BI__builtin_HEXAGON_V6_vand_128B, {"v60", "v62", "v65"} },
1909     { Hexagon::BI__builtin_HEXAGON_V6_vandnqrt, {"v62", "v65"} },
1910     { Hexagon::BI__builtin_HEXAGON_V6_vandnqrt_128B, {"v62", "v65"} },
1911     { Hexagon::BI__builtin_HEXAGON_V6_vandnqrt_acc, {"v62", "v65"} },
1912     { Hexagon::BI__builtin_HEXAGON_V6_vandnqrt_acc_128B, {"v62", "v65"} },
1913     { Hexagon::BI__builtin_HEXAGON_V6_vandqrt, {"v60", "v62", "v65"} },
1914     { Hexagon::BI__builtin_HEXAGON_V6_vandqrt_128B, {"v60", "v62", "v65"} },
1915     { Hexagon::BI__builtin_HEXAGON_V6_vandqrt_acc, {"v60", "v62", "v65"} },
1916     { Hexagon::BI__builtin_HEXAGON_V6_vandqrt_acc_128B, {"v60", "v62", "v65"} },
1917     { Hexagon::BI__builtin_HEXAGON_V6_vandvnqv, {"v62", "v65"} },
1918     { Hexagon::BI__builtin_HEXAGON_V6_vandvnqv_128B, {"v62", "v65"} },
1919     { Hexagon::BI__builtin_HEXAGON_V6_vandvqv, {"v62", "v65"} },
1920     { Hexagon::BI__builtin_HEXAGON_V6_vandvqv_128B, {"v62", "v65"} },
1921     { Hexagon::BI__builtin_HEXAGON_V6_vandvrt, {"v60", "v62", "v65"} },
1922     { Hexagon::BI__builtin_HEXAGON_V6_vandvrt_128B, {"v60", "v62", "v65"} },
1923     { Hexagon::BI__builtin_HEXAGON_V6_vandvrt_acc, {"v60", "v62", "v65"} },
1924     { Hexagon::BI__builtin_HEXAGON_V6_vandvrt_acc_128B, {"v60", "v62", "v65"} },
1925     { Hexagon::BI__builtin_HEXAGON_V6_vaslh, {"v60", "v62", "v65"} },
1926     { Hexagon::BI__builtin_HEXAGON_V6_vaslh_128B, {"v60", "v62", "v65"} },
1927     { Hexagon::BI__builtin_HEXAGON_V6_vaslh_acc, {"v65"} },
1928     { Hexagon::BI__builtin_HEXAGON_V6_vaslh_acc_128B, {"v65"} },
1929     { Hexagon::BI__builtin_HEXAGON_V6_vaslhv, {"v60", "v62", "v65"} },
1930     { Hexagon::BI__builtin_HEXAGON_V6_vaslhv_128B, {"v60", "v62", "v65"} },
1931     { Hexagon::BI__builtin_HEXAGON_V6_vaslw, {"v60", "v62", "v65"} },
1932     { Hexagon::BI__builtin_HEXAGON_V6_vaslw_128B, {"v60", "v62", "v65"} },
1933     { Hexagon::BI__builtin_HEXAGON_V6_vaslw_acc, {"v60", "v62", "v65"} },
1934     { Hexagon::BI__builtin_HEXAGON_V6_vaslw_acc_128B, {"v60", "v62", "v65"} },
1935     { Hexagon::BI__builtin_HEXAGON_V6_vaslwv, {"v60", "v62", "v65"} },
1936     { Hexagon::BI__builtin_HEXAGON_V6_vaslwv_128B, {"v60", "v62", "v65"} },
1937     { Hexagon::BI__builtin_HEXAGON_V6_vasrh, {"v60", "v62", "v65"} },
1938     { Hexagon::BI__builtin_HEXAGON_V6_vasrh_128B, {"v60", "v62", "v65"} },
1939     { Hexagon::BI__builtin_HEXAGON_V6_vasrh_acc, {"v65"} },
1940     { Hexagon::BI__builtin_HEXAGON_V6_vasrh_acc_128B, {"v65"} },
1941     { Hexagon::BI__builtin_HEXAGON_V6_vasrhbrndsat, {"v60", "v62", "v65"} },
1942     { Hexagon::BI__builtin_HEXAGON_V6_vasrhbrndsat_128B, {"v60", "v62", "v65"} },
1943     { Hexagon::BI__builtin_HEXAGON_V6_vasrhbsat, {"v62", "v65"} },
1944     { Hexagon::BI__builtin_HEXAGON_V6_vasrhbsat_128B, {"v62", "v65"} },
1945     { Hexagon::BI__builtin_HEXAGON_V6_vasrhubrndsat, {"v60", "v62", "v65"} },
1946     { Hexagon::BI__builtin_HEXAGON_V6_vasrhubrndsat_128B, {"v60", "v62", "v65"} },
1947     { Hexagon::BI__builtin_HEXAGON_V6_vasrhubsat, {"v60", "v62", "v65"} },
1948     { Hexagon::BI__builtin_HEXAGON_V6_vasrhubsat_128B, {"v60", "v62", "v65"} },
1949     { Hexagon::BI__builtin_HEXAGON_V6_vasrhv, {"v60", "v62", "v65"} },
1950     { Hexagon::BI__builtin_HEXAGON_V6_vasrhv_128B, {"v60", "v62", "v65"} },
1951     { Hexagon::BI__builtin_HEXAGON_V6_vasruhubrndsat, {"v65"} },
1952     { Hexagon::BI__builtin_HEXAGON_V6_vasruhubrndsat_128B, {"v65"} },
1953     { Hexagon::BI__builtin_HEXAGON_V6_vasruhubsat, {"v65"} },
1954     { Hexagon::BI__builtin_HEXAGON_V6_vasruhubsat_128B, {"v65"} },
1955     { Hexagon::BI__builtin_HEXAGON_V6_vasruwuhrndsat, {"v62", "v65"} },
1956     { Hexagon::BI__builtin_HEXAGON_V6_vasruwuhrndsat_128B, {"v62", "v65"} },
1957     { Hexagon::BI__builtin_HEXAGON_V6_vasruwuhsat, {"v65"} },
1958     { Hexagon::BI__builtin_HEXAGON_V6_vasruwuhsat_128B, {"v65"} },
1959     { Hexagon::BI__builtin_HEXAGON_V6_vasrw, {"v60", "v62", "v65"} },
1960     { Hexagon::BI__builtin_HEXAGON_V6_vasrw_128B, {"v60", "v62", "v65"} },
1961     { Hexagon::BI__builtin_HEXAGON_V6_vasrw_acc, {"v60", "v62", "v65"} },
1962     { Hexagon::BI__builtin_HEXAGON_V6_vasrw_acc_128B, {"v60", "v62", "v65"} },
1963     { Hexagon::BI__builtin_HEXAGON_V6_vasrwh, {"v60", "v62", "v65"} },
1964     { Hexagon::BI__builtin_HEXAGON_V6_vasrwh_128B, {"v60", "v62", "v65"} },
1965     { Hexagon::BI__builtin_HEXAGON_V6_vasrwhrndsat, {"v60", "v62", "v65"} },
1966     { Hexagon::BI__builtin_HEXAGON_V6_vasrwhrndsat_128B, {"v60", "v62", "v65"} },
1967     { Hexagon::BI__builtin_HEXAGON_V6_vasrwhsat, {"v60", "v62", "v65"} },
1968     { Hexagon::BI__builtin_HEXAGON_V6_vasrwhsat_128B, {"v60", "v62", "v65"} },
1969     { Hexagon::BI__builtin_HEXAGON_V6_vasrwuhrndsat, {"v62", "v65"} },
1970     { Hexagon::BI__builtin_HEXAGON_V6_vasrwuhrndsat_128B, {"v62", "v65"} },
1971     { Hexagon::BI__builtin_HEXAGON_V6_vasrwuhsat, {"v60", "v62", "v65"} },
1972     { Hexagon::BI__builtin_HEXAGON_V6_vasrwuhsat_128B, {"v60", "v62", "v65"} },
1973     { Hexagon::BI__builtin_HEXAGON_V6_vasrwv, {"v60", "v62", "v65"} },
1974     { Hexagon::BI__builtin_HEXAGON_V6_vasrwv_128B, {"v60", "v62", "v65"} },
1975     { Hexagon::BI__builtin_HEXAGON_V6_vassign, {"v60", "v62", "v65"} },
1976     { Hexagon::BI__builtin_HEXAGON_V6_vassign_128B, {"v60", "v62", "v65"} },
1977     { Hexagon::BI__builtin_HEXAGON_V6_vassignp, {"v60", "v62", "v65"} },
1978     { Hexagon::BI__builtin_HEXAGON_V6_vassignp_128B, {"v60", "v62", "v65"} },
1979     { Hexagon::BI__builtin_HEXAGON_V6_vavgb, {"v65"} },
1980     { Hexagon::BI__builtin_HEXAGON_V6_vavgb_128B, {"v65"} },
1981     { Hexagon::BI__builtin_HEXAGON_V6_vavgbrnd, {"v65"} },
1982     { Hexagon::BI__builtin_HEXAGON_V6_vavgbrnd_128B, {"v65"} },
1983     { Hexagon::BI__builtin_HEXAGON_V6_vavgh, {"v60", "v62", "v65"} },
1984     { Hexagon::BI__builtin_HEXAGON_V6_vavgh_128B, {"v60", "v62", "v65"} },
1985     { Hexagon::BI__builtin_HEXAGON_V6_vavghrnd, {"v60", "v62", "v65"} },
1986     { Hexagon::BI__builtin_HEXAGON_V6_vavghrnd_128B, {"v60", "v62", "v65"} },
1987     { Hexagon::BI__builtin_HEXAGON_V6_vavgub, {"v60", "v62", "v65"} },
1988     { Hexagon::BI__builtin_HEXAGON_V6_vavgub_128B, {"v60", "v62", "v65"} },
1989     { Hexagon::BI__builtin_HEXAGON_V6_vavgubrnd, {"v60", "v62", "v65"} },
1990     { Hexagon::BI__builtin_HEXAGON_V6_vavgubrnd_128B, {"v60", "v62", "v65"} },
1991     { Hexagon::BI__builtin_HEXAGON_V6_vavguh, {"v60", "v62", "v65"} },
1992     { Hexagon::BI__builtin_HEXAGON_V6_vavguh_128B, {"v60", "v62", "v65"} },
1993     { Hexagon::BI__builtin_HEXAGON_V6_vavguhrnd, {"v60", "v62", "v65"} },
1994     { Hexagon::BI__builtin_HEXAGON_V6_vavguhrnd_128B, {"v60", "v62", "v65"} },
1995     { Hexagon::BI__builtin_HEXAGON_V6_vavguw, {"v65"} },
1996     { Hexagon::BI__builtin_HEXAGON_V6_vavguw_128B, {"v65"} },
1997     { Hexagon::BI__builtin_HEXAGON_V6_vavguwrnd, {"v65"} },
1998     { Hexagon::BI__builtin_HEXAGON_V6_vavguwrnd_128B, {"v65"} },
1999     { Hexagon::BI__builtin_HEXAGON_V6_vavgw, {"v60", "v62", "v65"} },
2000     { Hexagon::BI__builtin_HEXAGON_V6_vavgw_128B, {"v60", "v62", "v65"} },
2001     { Hexagon::BI__builtin_HEXAGON_V6_vavgwrnd, {"v60", "v62", "v65"} },
2002     { Hexagon::BI__builtin_HEXAGON_V6_vavgwrnd_128B, {"v60", "v62", "v65"} },
2003     { Hexagon::BI__builtin_HEXAGON_V6_vcl0h, {"v60", "v62", "v65"} },
2004     { Hexagon::BI__builtin_HEXAGON_V6_vcl0h_128B, {"v60", "v62", "v65"} },
2005     { Hexagon::BI__builtin_HEXAGON_V6_vcl0w, {"v60", "v62", "v65"} },
2006     { Hexagon::BI__builtin_HEXAGON_V6_vcl0w_128B, {"v60", "v62", "v65"} },
2007     { Hexagon::BI__builtin_HEXAGON_V6_vcombine, {"v60", "v62", "v65"} },
2008     { Hexagon::BI__builtin_HEXAGON_V6_vcombine_128B, {"v60", "v62", "v65"} },
2009     { Hexagon::BI__builtin_HEXAGON_V6_vd0, {"v60", "v62", "v65"} },
2010     { Hexagon::BI__builtin_HEXAGON_V6_vd0_128B, {"v60", "v62", "v65"} },
2011     { Hexagon::BI__builtin_HEXAGON_V6_vdd0, {"v65"} },
2012     { Hexagon::BI__builtin_HEXAGON_V6_vdd0_128B, {"v65"} },
2013     { Hexagon::BI__builtin_HEXAGON_V6_vdealb, {"v60", "v62", "v65"} },
2014     { Hexagon::BI__builtin_HEXAGON_V6_vdealb_128B, {"v60", "v62", "v65"} },
2015     { Hexagon::BI__builtin_HEXAGON_V6_vdealb4w, {"v60", "v62", "v65"} },
2016     { Hexagon::BI__builtin_HEXAGON_V6_vdealb4w_128B, {"v60", "v62", "v65"} },
2017     { Hexagon::BI__builtin_HEXAGON_V6_vdealh, {"v60", "v62", "v65"} },
2018     { Hexagon::BI__builtin_HEXAGON_V6_vdealh_128B, {"v60", "v62", "v65"} },
2019     { Hexagon::BI__builtin_HEXAGON_V6_vdealvdd, {"v60", "v62", "v65"} },
2020     { Hexagon::BI__builtin_HEXAGON_V6_vdealvdd_128B, {"v60", "v62", "v65"} },
2021     { Hexagon::BI__builtin_HEXAGON_V6_vdelta, {"v60", "v62", "v65"} },
2022     { Hexagon::BI__builtin_HEXAGON_V6_vdelta_128B, {"v60", "v62", "v65"} },
2023     { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus, {"v60", "v62", "v65"} },
2024     { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_128B, {"v60", "v62", "v65"} },
2025     { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_acc, {"v60", "v62", "v65"} },
2026     { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_acc_128B, {"v60", "v62", "v65"} },
2027     { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_dv, {"v60", "v62", "v65"} },
2028     { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_dv_128B, {"v60", "v62", "v65"} },
2029     { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_dv_acc, {"v60", "v62", "v65"} },
2030     { Hexagon::BI__builtin_HEXAGON_V6_vdmpybus_dv_acc_128B, {"v60", "v62", "v65"} },
2031     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb, {"v60", "v62", "v65"} },
2032     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_128B, {"v60", "v62", "v65"} },
2033     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_acc, {"v60", "v62", "v65"} },
2034     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_acc_128B, {"v60", "v62", "v65"} },
2035     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_dv, {"v60", "v62", "v65"} },
2036     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_dv_128B, {"v60", "v62", "v65"} },
2037     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_dv_acc, {"v60", "v62", "v65"} },
2038     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhb_dv_acc_128B, {"v60", "v62", "v65"} },
2039     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhisat, {"v60", "v62", "v65"} },
2040     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhisat_128B, {"v60", "v62", "v65"} },
2041     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhisat_acc, {"v60", "v62", "v65"} },
2042     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhisat_acc_128B, {"v60", "v62", "v65"} },
2043     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsat, {"v60", "v62", "v65"} },
2044     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsat_128B, {"v60", "v62", "v65"} },
2045     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsat_acc, {"v60", "v62", "v65"} },
2046     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsat_acc_128B, {"v60", "v62", "v65"} },
2047     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsuisat, {"v60", "v62", "v65"} },
2048     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsuisat_128B, {"v60", "v62", "v65"} },
2049     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsuisat_acc, {"v60", "v62", "v65"} },
2050     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsuisat_acc_128B, {"v60", "v62", "v65"} },
2051     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsusat, {"v60", "v62", "v65"} },
2052     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsusat_128B, {"v60", "v62", "v65"} },
2053     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsusat_acc, {"v60", "v62", "v65"} },
2054     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhsusat_acc_128B, {"v60", "v62", "v65"} },
2055     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhvsat, {"v60", "v62", "v65"} },
2056     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhvsat_128B, {"v60", "v62", "v65"} },
2057     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhvsat_acc, {"v60", "v62", "v65"} },
2058     { Hexagon::BI__builtin_HEXAGON_V6_vdmpyhvsat_acc_128B, {"v60", "v62", "v65"} },
2059     { Hexagon::BI__builtin_HEXAGON_V6_vdsaduh, {"v60", "v62", "v65"} },
2060     { Hexagon::BI__builtin_HEXAGON_V6_vdsaduh_128B, {"v60", "v62", "v65"} },
2061     { Hexagon::BI__builtin_HEXAGON_V6_vdsaduh_acc, {"v60", "v62", "v65"} },
2062     { Hexagon::BI__builtin_HEXAGON_V6_vdsaduh_acc_128B, {"v60", "v62", "v65"} },
2063     { Hexagon::BI__builtin_HEXAGON_V6_veqb, {"v60", "v62", "v65"} },
2064     { Hexagon::BI__builtin_HEXAGON_V6_veqb_128B, {"v60", "v62", "v65"} },
2065     { Hexagon::BI__builtin_HEXAGON_V6_veqb_and, {"v60", "v62", "v65"} },
2066     { Hexagon::BI__builtin_HEXAGON_V6_veqb_and_128B, {"v60", "v62", "v65"} },
2067     { Hexagon::BI__builtin_HEXAGON_V6_veqb_or, {"v60", "v62", "v65"} },
2068     { Hexagon::BI__builtin_HEXAGON_V6_veqb_or_128B, {"v60", "v62", "v65"} },
2069     { Hexagon::BI__builtin_HEXAGON_V6_veqb_xor, {"v60", "v62", "v65"} },
2070     { Hexagon::BI__builtin_HEXAGON_V6_veqb_xor_128B, {"v60", "v62", "v65"} },
2071     { Hexagon::BI__builtin_HEXAGON_V6_veqh, {"v60", "v62", "v65"} },
2072     { Hexagon::BI__builtin_HEXAGON_V6_veqh_128B, {"v60", "v62", "v65"} },
2073     { Hexagon::BI__builtin_HEXAGON_V6_veqh_and, {"v60", "v62", "v65"} },
2074     { Hexagon::BI__builtin_HEXAGON_V6_veqh_and_128B, {"v60", "v62", "v65"} },
2075     { Hexagon::BI__builtin_HEXAGON_V6_veqh_or, {"v60", "v62", "v65"} },
2076     { Hexagon::BI__builtin_HEXAGON_V6_veqh_or_128B, {"v60", "v62", "v65"} },
2077     { Hexagon::BI__builtin_HEXAGON_V6_veqh_xor, {"v60", "v62", "v65"} },
2078     { Hexagon::BI__builtin_HEXAGON_V6_veqh_xor_128B, {"v60", "v62", "v65"} },
2079     { Hexagon::BI__builtin_HEXAGON_V6_veqw, {"v60", "v62", "v65"} },
2080     { Hexagon::BI__builtin_HEXAGON_V6_veqw_128B, {"v60", "v62", "v65"} },
2081     { Hexagon::BI__builtin_HEXAGON_V6_veqw_and, {"v60", "v62", "v65"} },
2082     { Hexagon::BI__builtin_HEXAGON_V6_veqw_and_128B, {"v60", "v62", "v65"} },
2083     { Hexagon::BI__builtin_HEXAGON_V6_veqw_or, {"v60", "v62", "v65"} },
2084     { Hexagon::BI__builtin_HEXAGON_V6_veqw_or_128B, {"v60", "v62", "v65"} },
2085     { Hexagon::BI__builtin_HEXAGON_V6_veqw_xor, {"v60", "v62", "v65"} },
2086     { Hexagon::BI__builtin_HEXAGON_V6_veqw_xor_128B, {"v60", "v62", "v65"} },
2087     { Hexagon::BI__builtin_HEXAGON_V6_vgtb, {"v60", "v62", "v65"} },
2088     { Hexagon::BI__builtin_HEXAGON_V6_vgtb_128B, {"v60", "v62", "v65"} },
2089     { Hexagon::BI__builtin_HEXAGON_V6_vgtb_and, {"v60", "v62", "v65"} },
2090     { Hexagon::BI__builtin_HEXAGON_V6_vgtb_and_128B, {"v60", "v62", "v65"} },
2091     { Hexagon::BI__builtin_HEXAGON_V6_vgtb_or, {"v60", "v62", "v65"} },
2092     { Hexagon::BI__builtin_HEXAGON_V6_vgtb_or_128B, {"v60", "v62", "v65"} },
2093     { Hexagon::BI__builtin_HEXAGON_V6_vgtb_xor, {"v60", "v62", "v65"} },
2094     { Hexagon::BI__builtin_HEXAGON_V6_vgtb_xor_128B, {"v60", "v62", "v65"} },
2095     { Hexagon::BI__builtin_HEXAGON_V6_vgth, {"v60", "v62", "v65"} },
2096     { Hexagon::BI__builtin_HEXAGON_V6_vgth_128B, {"v60", "v62", "v65"} },
2097     { Hexagon::BI__builtin_HEXAGON_V6_vgth_and, {"v60", "v62", "v65"} },
2098     { Hexagon::BI__builtin_HEXAGON_V6_vgth_and_128B, {"v60", "v62", "v65"} },
2099     { Hexagon::BI__builtin_HEXAGON_V6_vgth_or, {"v60", "v62", "v65"} },
2100     { Hexagon::BI__builtin_HEXAGON_V6_vgth_or_128B, {"v60", "v62", "v65"} },
2101     { Hexagon::BI__builtin_HEXAGON_V6_vgth_xor, {"v60", "v62", "v65"} },
2102     { Hexagon::BI__builtin_HEXAGON_V6_vgth_xor_128B, {"v60", "v62", "v65"} },
2103     { Hexagon::BI__builtin_HEXAGON_V6_vgtub, {"v60", "v62", "v65"} },
2104     { Hexagon::BI__builtin_HEXAGON_V6_vgtub_128B, {"v60", "v62", "v65"} },
2105     { Hexagon::BI__builtin_HEXAGON_V6_vgtub_and, {"v60", "v62", "v65"} },
2106     { Hexagon::BI__builtin_HEXAGON_V6_vgtub_and_128B, {"v60", "v62", "v65"} },
2107     { Hexagon::BI__builtin_HEXAGON_V6_vgtub_or, {"v60", "v62", "v65"} },
2108     { Hexagon::BI__builtin_HEXAGON_V6_vgtub_or_128B, {"v60", "v62", "v65"} },
2109     { Hexagon::BI__builtin_HEXAGON_V6_vgtub_xor, {"v60", "v62", "v65"} },
2110     { Hexagon::BI__builtin_HEXAGON_V6_vgtub_xor_128B, {"v60", "v62", "v65"} },
2111     { Hexagon::BI__builtin_HEXAGON_V6_vgtuh, {"v60", "v62", "v65"} },
2112     { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_128B, {"v60", "v62", "v65"} },
2113     { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_and, {"v60", "v62", "v65"} },
2114     { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_and_128B, {"v60", "v62", "v65"} },
2115     { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_or, {"v60", "v62", "v65"} },
2116     { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_or_128B, {"v60", "v62", "v65"} },
2117     { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_xor, {"v60", "v62", "v65"} },
2118     { Hexagon::BI__builtin_HEXAGON_V6_vgtuh_xor_128B, {"v60", "v62", "v65"} },
2119     { Hexagon::BI__builtin_HEXAGON_V6_vgtuw, {"v60", "v62", "v65"} },
2120     { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_128B, {"v60", "v62", "v65"} },
2121     { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_and, {"v60", "v62", "v65"} },
2122     { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_and_128B, {"v60", "v62", "v65"} },
2123     { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_or, {"v60", "v62", "v65"} },
2124     { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_or_128B, {"v60", "v62", "v65"} },
2125     { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_xor, {"v60", "v62", "v65"} },
2126     { Hexagon::BI__builtin_HEXAGON_V6_vgtuw_xor_128B, {"v60", "v62", "v65"} },
2127     { Hexagon::BI__builtin_HEXAGON_V6_vgtw, {"v60", "v62", "v65"} },
2128     { Hexagon::BI__builtin_HEXAGON_V6_vgtw_128B, {"v60", "v62", "v65"} },
2129     { Hexagon::BI__builtin_HEXAGON_V6_vgtw_and, {"v60", "v62", "v65"} },
2130     { Hexagon::BI__builtin_HEXAGON_V6_vgtw_and_128B, {"v60", "v62", "v65"} },
2131     { Hexagon::BI__builtin_HEXAGON_V6_vgtw_or, {"v60", "v62", "v65"} },
2132     { Hexagon::BI__builtin_HEXAGON_V6_vgtw_or_128B, {"v60", "v62", "v65"} },
2133     { Hexagon::BI__builtin_HEXAGON_V6_vgtw_xor, {"v60", "v62", "v65"} },
2134     { Hexagon::BI__builtin_HEXAGON_V6_vgtw_xor_128B, {"v60", "v62", "v65"} },
2135     { Hexagon::BI__builtin_HEXAGON_V6_vinsertwr, {"v60", "v62", "v65"} },
2136     { Hexagon::BI__builtin_HEXAGON_V6_vinsertwr_128B, {"v60", "v62", "v65"} },
2137     { Hexagon::BI__builtin_HEXAGON_V6_vlalignb, {"v60", "v62", "v65"} },
2138     { Hexagon::BI__builtin_HEXAGON_V6_vlalignb_128B, {"v60", "v62", "v65"} },
2139     { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi, {"v60", "v62", "v65"} },
2140     { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi_128B, {"v60", "v62", "v65"} },
2141     { Hexagon::BI__builtin_HEXAGON_V6_vlsrb, {"v62", "v65"} },
2142     { Hexagon::BI__builtin_HEXAGON_V6_vlsrb_128B, {"v62", "v65"} },
2143     { Hexagon::BI__builtin_HEXAGON_V6_vlsrh, {"v60", "v62", "v65"} },
2144     { Hexagon::BI__builtin_HEXAGON_V6_vlsrh_128B, {"v60", "v62", "v65"} },
2145     { Hexagon::BI__builtin_HEXAGON_V6_vlsrhv, {"v60", "v62", "v65"} },
2146     { Hexagon::BI__builtin_HEXAGON_V6_vlsrhv_128B, {"v60", "v62", "v65"} },
2147     { Hexagon::BI__builtin_HEXAGON_V6_vlsrw, {"v60", "v62", "v65"} },
2148     { Hexagon::BI__builtin_HEXAGON_V6_vlsrw_128B, {"v60", "v62", "v65"} },
2149     { Hexagon::BI__builtin_HEXAGON_V6_vlsrwv, {"v60", "v62", "v65"} },
2150     { Hexagon::BI__builtin_HEXAGON_V6_vlsrwv_128B, {"v60", "v62", "v65"} },
2151     { Hexagon::BI__builtin_HEXAGON_V6_vlut4, {"v65"} },
2152     { Hexagon::BI__builtin_HEXAGON_V6_vlut4_128B, {"v65"} },
2153     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb, {"v60", "v62", "v65"} },
2154     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_128B, {"v60", "v62", "v65"} },
2155     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvbi, {"v62", "v65"} },
2156     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvbi_128B, {"v62", "v65"} },
2157     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_nm, {"v62", "v65"} },
2158     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_nm_128B, {"v62", "v65"} },
2159     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_oracc, {"v60", "v62", "v65"} },
2160     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_oracc_128B, {"v60", "v62", "v65"} },
2161     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_oracci, {"v62", "v65"} },
2162     { Hexagon::BI__builtin_HEXAGON_V6_vlutvvb_oracci_128B, {"v62", "v65"} },
2163     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh, {"v60", "v62", "v65"} },
2164     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_128B, {"v60", "v62", "v65"} },
2165     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwhi, {"v62", "v65"} },
2166     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwhi_128B, {"v62", "v65"} },
2167     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_nm, {"v62", "v65"} },
2168     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_nm_128B, {"v62", "v65"} },
2169     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_oracc, {"v60", "v62", "v65"} },
2170     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_oracc_128B, {"v60", "v62", "v65"} },
2171     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_oracci, {"v62", "v65"} },
2172     { Hexagon::BI__builtin_HEXAGON_V6_vlutvwh_oracci_128B, {"v62", "v65"} },
2173     { Hexagon::BI__builtin_HEXAGON_V6_vmaxb, {"v62", "v65"} },
2174     { Hexagon::BI__builtin_HEXAGON_V6_vmaxb_128B, {"v62", "v65"} },
2175     { Hexagon::BI__builtin_HEXAGON_V6_vmaxh, {"v60", "v62", "v65"} },
2176     { Hexagon::BI__builtin_HEXAGON_V6_vmaxh_128B, {"v60", "v62", "v65"} },
2177     { Hexagon::BI__builtin_HEXAGON_V6_vmaxub, {"v60", "v62", "v65"} },
2178     { Hexagon::BI__builtin_HEXAGON_V6_vmaxub_128B, {"v60", "v62", "v65"} },
2179     { Hexagon::BI__builtin_HEXAGON_V6_vmaxuh, {"v60", "v62", "v65"} },
2180     { Hexagon::BI__builtin_HEXAGON_V6_vmaxuh_128B, {"v60", "v62", "v65"} },
2181     { Hexagon::BI__builtin_HEXAGON_V6_vmaxw, {"v60", "v62", "v65"} },
2182     { Hexagon::BI__builtin_HEXAGON_V6_vmaxw_128B, {"v60", "v62", "v65"} },
2183     { Hexagon::BI__builtin_HEXAGON_V6_vminb, {"v62", "v65"} },
2184     { Hexagon::BI__builtin_HEXAGON_V6_vminb_128B, {"v62", "v65"} },
2185     { Hexagon::BI__builtin_HEXAGON_V6_vminh, {"v60", "v62", "v65"} },
2186     { Hexagon::BI__builtin_HEXAGON_V6_vminh_128B, {"v60", "v62", "v65"} },
2187     { Hexagon::BI__builtin_HEXAGON_V6_vminub, {"v60", "v62", "v65"} },
2188     { Hexagon::BI__builtin_HEXAGON_V6_vminub_128B, {"v60", "v62", "v65"} },
2189     { Hexagon::BI__builtin_HEXAGON_V6_vminuh, {"v60", "v62", "v65"} },
2190     { Hexagon::BI__builtin_HEXAGON_V6_vminuh_128B, {"v60", "v62", "v65"} },
2191     { Hexagon::BI__builtin_HEXAGON_V6_vminw, {"v60", "v62", "v65"} },
2192     { Hexagon::BI__builtin_HEXAGON_V6_vminw_128B, {"v60", "v62", "v65"} },
2193     { Hexagon::BI__builtin_HEXAGON_V6_vmpabus, {"v60", "v62", "v65"} },
2194     { Hexagon::BI__builtin_HEXAGON_V6_vmpabus_128B, {"v60", "v62", "v65"} },
2195     { Hexagon::BI__builtin_HEXAGON_V6_vmpabus_acc, {"v60", "v62", "v65"} },
2196     { Hexagon::BI__builtin_HEXAGON_V6_vmpabus_acc_128B, {"v60", "v62", "v65"} },
2197     { Hexagon::BI__builtin_HEXAGON_V6_vmpabusv, {"v60", "v62", "v65"} },
2198     { Hexagon::BI__builtin_HEXAGON_V6_vmpabusv_128B, {"v60", "v62", "v65"} },
2199     { Hexagon::BI__builtin_HEXAGON_V6_vmpabuu, {"v65"} },
2200     { Hexagon::BI__builtin_HEXAGON_V6_vmpabuu_128B, {"v65"} },
2201     { Hexagon::BI__builtin_HEXAGON_V6_vmpabuu_acc, {"v65"} },
2202     { Hexagon::BI__builtin_HEXAGON_V6_vmpabuu_acc_128B, {"v65"} },
2203     { Hexagon::BI__builtin_HEXAGON_V6_vmpabuuv, {"v60", "v62", "v65"} },
2204     { Hexagon::BI__builtin_HEXAGON_V6_vmpabuuv_128B, {"v60", "v62", "v65"} },
2205     { Hexagon::BI__builtin_HEXAGON_V6_vmpahb, {"v60", "v62", "v65"} },
2206     { Hexagon::BI__builtin_HEXAGON_V6_vmpahb_128B, {"v60", "v62", "v65"} },
2207     { Hexagon::BI__builtin_HEXAGON_V6_vmpahb_acc, {"v60", "v62", "v65"} },
2208     { Hexagon::BI__builtin_HEXAGON_V6_vmpahb_acc_128B, {"v60", "v62", "v65"} },
2209     { Hexagon::BI__builtin_HEXAGON_V6_vmpahhsat, {"v65"} },
2210     { Hexagon::BI__builtin_HEXAGON_V6_vmpahhsat_128B, {"v65"} },
2211     { Hexagon::BI__builtin_HEXAGON_V6_vmpauhb, {"v62", "v65"} },
2212     { Hexagon::BI__builtin_HEXAGON_V6_vmpauhb_128B, {"v62", "v65"} },
2213     { Hexagon::BI__builtin_HEXAGON_V6_vmpauhb_acc, {"v62", "v65"} },
2214     { Hexagon::BI__builtin_HEXAGON_V6_vmpauhb_acc_128B, {"v62", "v65"} },
2215     { Hexagon::BI__builtin_HEXAGON_V6_vmpauhuhsat, {"v65"} },
2216     { Hexagon::BI__builtin_HEXAGON_V6_vmpauhuhsat_128B, {"v65"} },
2217     { Hexagon::BI__builtin_HEXAGON_V6_vmpsuhuhsat, {"v65"} },
2218     { Hexagon::BI__builtin_HEXAGON_V6_vmpsuhuhsat_128B, {"v65"} },
2219     { Hexagon::BI__builtin_HEXAGON_V6_vmpybus, {"v60", "v62", "v65"} },
2220     { Hexagon::BI__builtin_HEXAGON_V6_vmpybus_128B, {"v60", "v62", "v65"} },
2221     { Hexagon::BI__builtin_HEXAGON_V6_vmpybus_acc, {"v60", "v62", "v65"} },
2222     { Hexagon::BI__builtin_HEXAGON_V6_vmpybus_acc_128B, {"v60", "v62", "v65"} },
2223     { Hexagon::BI__builtin_HEXAGON_V6_vmpybusv, {"v60", "v62", "v65"} },
2224     { Hexagon::BI__builtin_HEXAGON_V6_vmpybusv_128B, {"v60", "v62", "v65"} },
2225     { Hexagon::BI__builtin_HEXAGON_V6_vmpybusv_acc, {"v60", "v62", "v65"} },
2226     { Hexagon::BI__builtin_HEXAGON_V6_vmpybusv_acc_128B, {"v60", "v62", "v65"} },
2227     { Hexagon::BI__builtin_HEXAGON_V6_vmpybv, {"v60", "v62", "v65"} },
2228     { Hexagon::BI__builtin_HEXAGON_V6_vmpybv_128B, {"v60", "v62", "v65"} },
2229     { Hexagon::BI__builtin_HEXAGON_V6_vmpybv_acc, {"v60", "v62", "v65"} },
2230     { Hexagon::BI__builtin_HEXAGON_V6_vmpybv_acc_128B, {"v60", "v62", "v65"} },
2231     { Hexagon::BI__builtin_HEXAGON_V6_vmpyewuh, {"v60", "v62", "v65"} },
2232     { Hexagon::BI__builtin_HEXAGON_V6_vmpyewuh_128B, {"v60", "v62", "v65"} },
2233     { Hexagon::BI__builtin_HEXAGON_V6_vmpyewuh_64, {"v62", "v65"} },
2234     { Hexagon::BI__builtin_HEXAGON_V6_vmpyewuh_64_128B, {"v62", "v65"} },
2235     { Hexagon::BI__builtin_HEXAGON_V6_vmpyh, {"v60", "v62", "v65"} },
2236     { Hexagon::BI__builtin_HEXAGON_V6_vmpyh_128B, {"v60", "v62", "v65"} },
2237     { Hexagon::BI__builtin_HEXAGON_V6_vmpyh_acc, {"v65"} },
2238     { Hexagon::BI__builtin_HEXAGON_V6_vmpyh_acc_128B, {"v65"} },
2239     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhsat_acc, {"v60", "v62", "v65"} },
2240     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhsat_acc_128B, {"v60", "v62", "v65"} },
2241     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhsrs, {"v60", "v62", "v65"} },
2242     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhsrs_128B, {"v60", "v62", "v65"} },
2243     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhss, {"v60", "v62", "v65"} },
2244     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhss_128B, {"v60", "v62", "v65"} },
2245     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhus, {"v60", "v62", "v65"} },
2246     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhus_128B, {"v60", "v62", "v65"} },
2247     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhus_acc, {"v60", "v62", "v65"} },
2248     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhus_acc_128B, {"v60", "v62", "v65"} },
2249     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhv, {"v60", "v62", "v65"} },
2250     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhv_128B, {"v60", "v62", "v65"} },
2251     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhv_acc, {"v60", "v62", "v65"} },
2252     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhv_acc_128B, {"v60", "v62", "v65"} },
2253     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhvsrs, {"v60", "v62", "v65"} },
2254     { Hexagon::BI__builtin_HEXAGON_V6_vmpyhvsrs_128B, {"v60", "v62", "v65"} },
2255     { Hexagon::BI__builtin_HEXAGON_V6_vmpyieoh, {"v60", "v62", "v65"} },
2256     { Hexagon::BI__builtin_HEXAGON_V6_vmpyieoh_128B, {"v60", "v62", "v65"} },
2257     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewh_acc, {"v60", "v62", "v65"} },
2258     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewh_acc_128B, {"v60", "v62", "v65"} },
2259     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewuh, {"v60", "v62", "v65"} },
2260     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewuh_128B, {"v60", "v62", "v65"} },
2261     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewuh_acc, {"v60", "v62", "v65"} },
2262     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiewuh_acc_128B, {"v60", "v62", "v65"} },
2263     { Hexagon::BI__builtin_HEXAGON_V6_vmpyih, {"v60", "v62", "v65"} },
2264     { Hexagon::BI__builtin_HEXAGON_V6_vmpyih_128B, {"v60", "v62", "v65"} },
2265     { Hexagon::BI__builtin_HEXAGON_V6_vmpyih_acc, {"v60", "v62", "v65"} },
2266     { Hexagon::BI__builtin_HEXAGON_V6_vmpyih_acc_128B, {"v60", "v62", "v65"} },
2267     { Hexagon::BI__builtin_HEXAGON_V6_vmpyihb, {"v60", "v62", "v65"} },
2268     { Hexagon::BI__builtin_HEXAGON_V6_vmpyihb_128B, {"v60", "v62", "v65"} },
2269     { Hexagon::BI__builtin_HEXAGON_V6_vmpyihb_acc, {"v60", "v62", "v65"} },
2270     { Hexagon::BI__builtin_HEXAGON_V6_vmpyihb_acc_128B, {"v60", "v62", "v65"} },
2271     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiowh, {"v60", "v62", "v65"} },
2272     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiowh_128B, {"v60", "v62", "v65"} },
2273     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwb, {"v60", "v62", "v65"} },
2274     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwb_128B, {"v60", "v62", "v65"} },
2275     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwb_acc, {"v60", "v62", "v65"} },
2276     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwb_acc_128B, {"v60", "v62", "v65"} },
2277     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwh, {"v60", "v62", "v65"} },
2278     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwh_128B, {"v60", "v62", "v65"} },
2279     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwh_acc, {"v60", "v62", "v65"} },
2280     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwh_acc_128B, {"v60", "v62", "v65"} },
2281     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwub, {"v62", "v65"} },
2282     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwub_128B, {"v62", "v65"} },
2283     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwub_acc, {"v62", "v65"} },
2284     { Hexagon::BI__builtin_HEXAGON_V6_vmpyiwub_acc_128B, {"v62", "v65"} },
2285     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh, {"v60", "v62", "v65"} },
2286     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_128B, {"v60", "v62", "v65"} },
2287     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_64_acc, {"v62", "v65"} },
2288     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_64_acc_128B, {"v62", "v65"} },
2289     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_rnd, {"v60", "v62", "v65"} },
2290     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_rnd_128B, {"v60", "v62", "v65"} },
2291     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_rnd_sacc, {"v60", "v62", "v65"} },
2292     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_rnd_sacc_128B, {"v60", "v62", "v65"} },
2293     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_sacc, {"v60", "v62", "v65"} },
2294     { Hexagon::BI__builtin_HEXAGON_V6_vmpyowh_sacc_128B, {"v60", "v62", "v65"} },
2295     { Hexagon::BI__builtin_HEXAGON_V6_vmpyub, {"v60", "v62", "v65"} },
2296     { Hexagon::BI__builtin_HEXAGON_V6_vmpyub_128B, {"v60", "v62", "v65"} },
2297     { Hexagon::BI__builtin_HEXAGON_V6_vmpyub_acc, {"v60", "v62", "v65"} },
2298     { Hexagon::BI__builtin_HEXAGON_V6_vmpyub_acc_128B, {"v60", "v62", "v65"} },
2299     { Hexagon::BI__builtin_HEXAGON_V6_vmpyubv, {"v60", "v62", "v65"} },
2300     { Hexagon::BI__builtin_HEXAGON_V6_vmpyubv_128B, {"v60", "v62", "v65"} },
2301     { Hexagon::BI__builtin_HEXAGON_V6_vmpyubv_acc, {"v60", "v62", "v65"} },
2302     { Hexagon::BI__builtin_HEXAGON_V6_vmpyubv_acc_128B, {"v60", "v62", "v65"} },
2303     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuh, {"v60", "v62", "v65"} },
2304     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuh_128B, {"v60", "v62", "v65"} },
2305     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuh_acc, {"v60", "v62", "v65"} },
2306     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuh_acc_128B, {"v60", "v62", "v65"} },
2307     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhe, {"v65"} },
2308     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhe_128B, {"v65"} },
2309     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhe_acc, {"v65"} },
2310     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhe_acc_128B, {"v65"} },
2311     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhv, {"v60", "v62", "v65"} },
2312     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhv_128B, {"v60", "v62", "v65"} },
2313     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhv_acc, {"v60", "v62", "v65"} },
2314     { Hexagon::BI__builtin_HEXAGON_V6_vmpyuhv_acc_128B, {"v60", "v62", "v65"} },
2315     { Hexagon::BI__builtin_HEXAGON_V6_vmux, {"v60", "v62", "v65"} },
2316     { Hexagon::BI__builtin_HEXAGON_V6_vmux_128B, {"v60", "v62", "v65"} },
2317     { Hexagon::BI__builtin_HEXAGON_V6_vnavgb, {"v65"} },
2318     { Hexagon::BI__builtin_HEXAGON_V6_vnavgb_128B, {"v65"} },
2319     { Hexagon::BI__builtin_HEXAGON_V6_vnavgh, {"v60", "v62", "v65"} },
2320     { Hexagon::BI__builtin_HEXAGON_V6_vnavgh_128B, {"v60", "v62", "v65"} },
2321     { Hexagon::BI__builtin_HEXAGON_V6_vnavgub, {"v60", "v62", "v65"} },
2322     { Hexagon::BI__builtin_HEXAGON_V6_vnavgub_128B, {"v60", "v62", "v65"} },
2323     { Hexagon::BI__builtin_HEXAGON_V6_vnavgw, {"v60", "v62", "v65"} },
2324     { Hexagon::BI__builtin_HEXAGON_V6_vnavgw_128B, {"v60", "v62", "v65"} },
2325     { Hexagon::BI__builtin_HEXAGON_V6_vnormamth, {"v60", "v62", "v65"} },
2326     { Hexagon::BI__builtin_HEXAGON_V6_vnormamth_128B, {"v60", "v62", "v65"} },
2327     { Hexagon::BI__builtin_HEXAGON_V6_vnormamtw, {"v60", "v62", "v65"} },
2328     { Hexagon::BI__builtin_HEXAGON_V6_vnormamtw_128B, {"v60", "v62", "v65"} },
2329     { Hexagon::BI__builtin_HEXAGON_V6_vnot, {"v60", "v62", "v65"} },
2330     { Hexagon::BI__builtin_HEXAGON_V6_vnot_128B, {"v60", "v62", "v65"} },
2331     { Hexagon::BI__builtin_HEXAGON_V6_vor, {"v60", "v62", "v65"} },
2332     { Hexagon::BI__builtin_HEXAGON_V6_vor_128B, {"v60", "v62", "v65"} },
2333     { Hexagon::BI__builtin_HEXAGON_V6_vpackeb, {"v60", "v62", "v65"} },
2334     { Hexagon::BI__builtin_HEXAGON_V6_vpackeb_128B, {"v60", "v62", "v65"} },
2335     { Hexagon::BI__builtin_HEXAGON_V6_vpackeh, {"v60", "v62", "v65"} },
2336     { Hexagon::BI__builtin_HEXAGON_V6_vpackeh_128B, {"v60", "v62", "v65"} },
2337     { Hexagon::BI__builtin_HEXAGON_V6_vpackhb_sat, {"v60", "v62", "v65"} },
2338     { Hexagon::BI__builtin_HEXAGON_V6_vpackhb_sat_128B, {"v60", "v62", "v65"} },
2339     { Hexagon::BI__builtin_HEXAGON_V6_vpackhub_sat, {"v60", "v62", "v65"} },
2340     { Hexagon::BI__builtin_HEXAGON_V6_vpackhub_sat_128B, {"v60", "v62", "v65"} },
2341     { Hexagon::BI__builtin_HEXAGON_V6_vpackob, {"v60", "v62", "v65"} },
2342     { Hexagon::BI__builtin_HEXAGON_V6_vpackob_128B, {"v60", "v62", "v65"} },
2343     { Hexagon::BI__builtin_HEXAGON_V6_vpackoh, {"v60", "v62", "v65"} },
2344     { Hexagon::BI__builtin_HEXAGON_V6_vpackoh_128B, {"v60", "v62", "v65"} },
2345     { Hexagon::BI__builtin_HEXAGON_V6_vpackwh_sat, {"v60", "v62", "v65"} },
2346     { Hexagon::BI__builtin_HEXAGON_V6_vpackwh_sat_128B, {"v60", "v62", "v65"} },
2347     { Hexagon::BI__builtin_HEXAGON_V6_vpackwuh_sat, {"v60", "v62", "v65"} },
2348     { Hexagon::BI__builtin_HEXAGON_V6_vpackwuh_sat_128B, {"v60", "v62", "v65"} },
2349     { Hexagon::BI__builtin_HEXAGON_V6_vpopcounth, {"v60", "v62", "v65"} },
2350     { Hexagon::BI__builtin_HEXAGON_V6_vpopcounth_128B, {"v60", "v62", "v65"} },
2351     { Hexagon::BI__builtin_HEXAGON_V6_vprefixqb, {"v65"} },
2352     { Hexagon::BI__builtin_HEXAGON_V6_vprefixqb_128B, {"v65"} },
2353     { Hexagon::BI__builtin_HEXAGON_V6_vprefixqh, {"v65"} },
2354     { Hexagon::BI__builtin_HEXAGON_V6_vprefixqh_128B, {"v65"} },
2355     { Hexagon::BI__builtin_HEXAGON_V6_vprefixqw, {"v65"} },
2356     { Hexagon::BI__builtin_HEXAGON_V6_vprefixqw_128B, {"v65"} },
2357     { Hexagon::BI__builtin_HEXAGON_V6_vrdelta, {"v60", "v62", "v65"} },
2358     { Hexagon::BI__builtin_HEXAGON_V6_vrdelta_128B, {"v60", "v62", "v65"} },
2359     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybub_rtt, {"v65"} },
2360     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybub_rtt_128B, {"v65"} },
2361     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybub_rtt_acc, {"v65"} },
2362     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybub_rtt_acc_128B, {"v65"} },
2363     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybus, {"v60", "v62", "v65"} },
2364     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybus_128B, {"v60", "v62", "v65"} },
2365     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybus_acc, {"v60", "v62", "v65"} },
2366     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybus_acc_128B, {"v60", "v62", "v65"} },
2367     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi, {"v60", "v62", "v65"} },
2368     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_128B, {"v60", "v62", "v65"} },
2369     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc, {"v60", "v62", "v65"} },
2370     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc_128B, {"v60", "v62", "v65"} },
2371     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusv, {"v60", "v62", "v65"} },
2372     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusv_128B, {"v60", "v62", "v65"} },
2373     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusv_acc, {"v60", "v62", "v65"} },
2374     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusv_acc_128B, {"v60", "v62", "v65"} },
2375     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybv, {"v60", "v62", "v65"} },
2376     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybv_128B, {"v60", "v62", "v65"} },
2377     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybv_acc, {"v60", "v62", "v65"} },
2378     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybv_acc_128B, {"v60", "v62", "v65"} },
2379     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub, {"v60", "v62", "v65"} },
2380     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_128B, {"v60", "v62", "v65"} },
2381     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_acc, {"v60", "v62", "v65"} },
2382     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_acc_128B, {"v60", "v62", "v65"} },
2383     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi, {"v60", "v62", "v65"} },
2384     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_128B, {"v60", "v62", "v65"} },
2385     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc, {"v60", "v62", "v65"} },
2386     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc_128B, {"v60", "v62", "v65"} },
2387     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_rtt, {"v65"} },
2388     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_rtt_128B, {"v65"} },
2389     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_rtt_acc, {"v65"} },
2390     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyub_rtt_acc_128B, {"v65"} },
2391     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubv, {"v60", "v62", "v65"} },
2392     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubv_128B, {"v60", "v62", "v65"} },
2393     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubv_acc, {"v60", "v62", "v65"} },
2394     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubv_acc_128B, {"v60", "v62", "v65"} },
2395     { Hexagon::BI__builtin_HEXAGON_V6_vror, {"v60", "v62", "v65"} },
2396     { Hexagon::BI__builtin_HEXAGON_V6_vror_128B, {"v60", "v62", "v65"} },
2397     { Hexagon::BI__builtin_HEXAGON_V6_vroundhb, {"v60", "v62", "v65"} },
2398     { Hexagon::BI__builtin_HEXAGON_V6_vroundhb_128B, {"v60", "v62", "v65"} },
2399     { Hexagon::BI__builtin_HEXAGON_V6_vroundhub, {"v60", "v62", "v65"} },
2400     { Hexagon::BI__builtin_HEXAGON_V6_vroundhub_128B, {"v60", "v62", "v65"} },
2401     { Hexagon::BI__builtin_HEXAGON_V6_vrounduhub, {"v62", "v65"} },
2402     { Hexagon::BI__builtin_HEXAGON_V6_vrounduhub_128B, {"v62", "v65"} },
2403     { Hexagon::BI__builtin_HEXAGON_V6_vrounduwuh, {"v62", "v65"} },
2404     { Hexagon::BI__builtin_HEXAGON_V6_vrounduwuh_128B, {"v62", "v65"} },
2405     { Hexagon::BI__builtin_HEXAGON_V6_vroundwh, {"v60", "v62", "v65"} },
2406     { Hexagon::BI__builtin_HEXAGON_V6_vroundwh_128B, {"v60", "v62", "v65"} },
2407     { Hexagon::BI__builtin_HEXAGON_V6_vroundwuh, {"v60", "v62", "v65"} },
2408     { Hexagon::BI__builtin_HEXAGON_V6_vroundwuh_128B, {"v60", "v62", "v65"} },
2409     { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi, {"v60", "v62", "v65"} },
2410     { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_128B, {"v60", "v62", "v65"} },
2411     { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc, {"v60", "v62", "v65"} },
2412     { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc_128B, {"v60", "v62", "v65"} },
2413     { Hexagon::BI__builtin_HEXAGON_V6_vsathub, {"v60", "v62", "v65"} },
2414     { Hexagon::BI__builtin_HEXAGON_V6_vsathub_128B, {"v60", "v62", "v65"} },
2415     { Hexagon::BI__builtin_HEXAGON_V6_vsatuwuh, {"v62", "v65"} },
2416     { Hexagon::BI__builtin_HEXAGON_V6_vsatuwuh_128B, {"v62", "v65"} },
2417     { Hexagon::BI__builtin_HEXAGON_V6_vsatwh, {"v60", "v62", "v65"} },
2418     { Hexagon::BI__builtin_HEXAGON_V6_vsatwh_128B, {"v60", "v62", "v65"} },
2419     { Hexagon::BI__builtin_HEXAGON_V6_vsb, {"v60", "v62", "v65"} },
2420     { Hexagon::BI__builtin_HEXAGON_V6_vsb_128B, {"v60", "v62", "v65"} },
2421     { Hexagon::BI__builtin_HEXAGON_V6_vsh, {"v60", "v62", "v65"} },
2422     { Hexagon::BI__builtin_HEXAGON_V6_vsh_128B, {"v60", "v62", "v65"} },
2423     { Hexagon::BI__builtin_HEXAGON_V6_vshufeh, {"v60", "v62", "v65"} },
2424     { Hexagon::BI__builtin_HEXAGON_V6_vshufeh_128B, {"v60", "v62", "v65"} },
2425     { Hexagon::BI__builtin_HEXAGON_V6_vshuffb, {"v60", "v62", "v65"} },
2426     { Hexagon::BI__builtin_HEXAGON_V6_vshuffb_128B, {"v60", "v62", "v65"} },
2427     { Hexagon::BI__builtin_HEXAGON_V6_vshuffeb, {"v60", "v62", "v65"} },
2428     { Hexagon::BI__builtin_HEXAGON_V6_vshuffeb_128B, {"v60", "v62", "v65"} },
2429     { Hexagon::BI__builtin_HEXAGON_V6_vshuffh, {"v60", "v62", "v65"} },
2430     { Hexagon::BI__builtin_HEXAGON_V6_vshuffh_128B, {"v60", "v62", "v65"} },
2431     { Hexagon::BI__builtin_HEXAGON_V6_vshuffob, {"v60", "v62", "v65"} },
2432     { Hexagon::BI__builtin_HEXAGON_V6_vshuffob_128B, {"v60", "v62", "v65"} },
2433     { Hexagon::BI__builtin_HEXAGON_V6_vshuffvdd, {"v60", "v62", "v65"} },
2434     { Hexagon::BI__builtin_HEXAGON_V6_vshuffvdd_128B, {"v60", "v62", "v65"} },
2435     { Hexagon::BI__builtin_HEXAGON_V6_vshufoeb, {"v60", "v62", "v65"} },
2436     { Hexagon::BI__builtin_HEXAGON_V6_vshufoeb_128B, {"v60", "v62", "v65"} },
2437     { Hexagon::BI__builtin_HEXAGON_V6_vshufoeh, {"v60", "v62", "v65"} },
2438     { Hexagon::BI__builtin_HEXAGON_V6_vshufoeh_128B, {"v60", "v62", "v65"} },
2439     { Hexagon::BI__builtin_HEXAGON_V6_vshufoh, {"v60", "v62", "v65"} },
2440     { Hexagon::BI__builtin_HEXAGON_V6_vshufoh_128B, {"v60", "v62", "v65"} },
2441     { Hexagon::BI__builtin_HEXAGON_V6_vsubb, {"v60", "v62", "v65"} },
2442     { Hexagon::BI__builtin_HEXAGON_V6_vsubb_128B, {"v60", "v62", "v65"} },
2443     { Hexagon::BI__builtin_HEXAGON_V6_vsubb_dv, {"v60", "v62", "v65"} },
2444     { Hexagon::BI__builtin_HEXAGON_V6_vsubb_dv_128B, {"v60", "v62", "v65"} },
2445     { Hexagon::BI__builtin_HEXAGON_V6_vsubbsat, {"v62", "v65"} },
2446     { Hexagon::BI__builtin_HEXAGON_V6_vsubbsat_128B, {"v62", "v65"} },
2447     { Hexagon::BI__builtin_HEXAGON_V6_vsubbsat_dv, {"v62", "v65"} },
2448     { Hexagon::BI__builtin_HEXAGON_V6_vsubbsat_dv_128B, {"v62", "v65"} },
2449     { Hexagon::BI__builtin_HEXAGON_V6_vsubcarry, {"v62", "v65"} },
2450     { Hexagon::BI__builtin_HEXAGON_V6_vsubcarry_128B, {"v62", "v65"} },
2451     { Hexagon::BI__builtin_HEXAGON_V6_vsubh, {"v60", "v62", "v65"} },
2452     { Hexagon::BI__builtin_HEXAGON_V6_vsubh_128B, {"v60", "v62", "v65"} },
2453     { Hexagon::BI__builtin_HEXAGON_V6_vsubh_dv, {"v60", "v62", "v65"} },
2454     { Hexagon::BI__builtin_HEXAGON_V6_vsubh_dv_128B, {"v60", "v62", "v65"} },
2455     { Hexagon::BI__builtin_HEXAGON_V6_vsubhsat, {"v60", "v62", "v65"} },
2456     { Hexagon::BI__builtin_HEXAGON_V6_vsubhsat_128B, {"v60", "v62", "v65"} },
2457     { Hexagon::BI__builtin_HEXAGON_V6_vsubhsat_dv, {"v60", "v62", "v65"} },
2458     { Hexagon::BI__builtin_HEXAGON_V6_vsubhsat_dv_128B, {"v60", "v62", "v65"} },
2459     { Hexagon::BI__builtin_HEXAGON_V6_vsubhw, {"v60", "v62", "v65"} },
2460     { Hexagon::BI__builtin_HEXAGON_V6_vsubhw_128B, {"v60", "v62", "v65"} },
2461     { Hexagon::BI__builtin_HEXAGON_V6_vsububh, {"v60", "v62", "v65"} },
2462     { Hexagon::BI__builtin_HEXAGON_V6_vsububh_128B, {"v60", "v62", "v65"} },
2463     { Hexagon::BI__builtin_HEXAGON_V6_vsububsat, {"v60", "v62", "v65"} },
2464     { Hexagon::BI__builtin_HEXAGON_V6_vsububsat_128B, {"v60", "v62", "v65"} },
2465     { Hexagon::BI__builtin_HEXAGON_V6_vsububsat_dv, {"v60", "v62", "v65"} },
2466     { Hexagon::BI__builtin_HEXAGON_V6_vsububsat_dv_128B, {"v60", "v62", "v65"} },
2467     { Hexagon::BI__builtin_HEXAGON_V6_vsubububb_sat, {"v62", "v65"} },
2468     { Hexagon::BI__builtin_HEXAGON_V6_vsubububb_sat_128B, {"v62", "v65"} },
2469     { Hexagon::BI__builtin_HEXAGON_V6_vsubuhsat, {"v60", "v62", "v65"} },
2470     { Hexagon::BI__builtin_HEXAGON_V6_vsubuhsat_128B, {"v60", "v62", "v65"} },
2471     { Hexagon::BI__builtin_HEXAGON_V6_vsubuhsat_dv, {"v60", "v62", "v65"} },
2472     { Hexagon::BI__builtin_HEXAGON_V6_vsubuhsat_dv_128B, {"v60", "v62", "v65"} },
2473     { Hexagon::BI__builtin_HEXAGON_V6_vsubuhw, {"v60", "v62", "v65"} },
2474     { Hexagon::BI__builtin_HEXAGON_V6_vsubuhw_128B, {"v60", "v62", "v65"} },
2475     { Hexagon::BI__builtin_HEXAGON_V6_vsubuwsat, {"v62", "v65"} },
2476     { Hexagon::BI__builtin_HEXAGON_V6_vsubuwsat_128B, {"v62", "v65"} },
2477     { Hexagon::BI__builtin_HEXAGON_V6_vsubuwsat_dv, {"v62", "v65"} },
2478     { Hexagon::BI__builtin_HEXAGON_V6_vsubuwsat_dv_128B, {"v62", "v65"} },
2479     { Hexagon::BI__builtin_HEXAGON_V6_vsubw, {"v60", "v62", "v65"} },
2480     { Hexagon::BI__builtin_HEXAGON_V6_vsubw_128B, {"v60", "v62", "v65"} },
2481     { Hexagon::BI__builtin_HEXAGON_V6_vsubw_dv, {"v60", "v62", "v65"} },
2482     { Hexagon::BI__builtin_HEXAGON_V6_vsubw_dv_128B, {"v60", "v62", "v65"} },
2483     { Hexagon::BI__builtin_HEXAGON_V6_vsubwsat, {"v60", "v62", "v65"} },
2484     { Hexagon::BI__builtin_HEXAGON_V6_vsubwsat_128B, {"v60", "v62", "v65"} },
2485     { Hexagon::BI__builtin_HEXAGON_V6_vsubwsat_dv, {"v60", "v62", "v65"} },
2486     { Hexagon::BI__builtin_HEXAGON_V6_vsubwsat_dv_128B, {"v60", "v62", "v65"} },
2487     { Hexagon::BI__builtin_HEXAGON_V6_vswap, {"v60", "v62", "v65"} },
2488     { Hexagon::BI__builtin_HEXAGON_V6_vswap_128B, {"v60", "v62", "v65"} },
2489     { Hexagon::BI__builtin_HEXAGON_V6_vtmpyb, {"v60", "v62", "v65"} },
2490     { Hexagon::BI__builtin_HEXAGON_V6_vtmpyb_128B, {"v60", "v62", "v65"} },
2491     { Hexagon::BI__builtin_HEXAGON_V6_vtmpyb_acc, {"v60", "v62", "v65"} },
2492     { Hexagon::BI__builtin_HEXAGON_V6_vtmpyb_acc_128B, {"v60", "v62", "v65"} },
2493     { Hexagon::BI__builtin_HEXAGON_V6_vtmpybus, {"v60", "v62", "v65"} },
2494     { Hexagon::BI__builtin_HEXAGON_V6_vtmpybus_128B, {"v60", "v62", "v65"} },
2495     { Hexagon::BI__builtin_HEXAGON_V6_vtmpybus_acc, {"v60", "v62", "v65"} },
2496     { Hexagon::BI__builtin_HEXAGON_V6_vtmpybus_acc_128B, {"v60", "v62", "v65"} },
2497     { Hexagon::BI__builtin_HEXAGON_V6_vtmpyhb, {"v60", "v62", "v65"} },
2498     { Hexagon::BI__builtin_HEXAGON_V6_vtmpyhb_128B, {"v60", "v62", "v65"} },
2499     { Hexagon::BI__builtin_HEXAGON_V6_vtmpyhb_acc, {"v60", "v62", "v65"} },
2500     { Hexagon::BI__builtin_HEXAGON_V6_vtmpyhb_acc_128B, {"v60", "v62", "v65"} },
2501     { Hexagon::BI__builtin_HEXAGON_V6_vunpackb, {"v60", "v62", "v65"} },
2502     { Hexagon::BI__builtin_HEXAGON_V6_vunpackb_128B, {"v60", "v62", "v65"} },
2503     { Hexagon::BI__builtin_HEXAGON_V6_vunpackh, {"v60", "v62", "v65"} },
2504     { Hexagon::BI__builtin_HEXAGON_V6_vunpackh_128B, {"v60", "v62", "v65"} },
2505     { Hexagon::BI__builtin_HEXAGON_V6_vunpackob, {"v60", "v62", "v65"} },
2506     { Hexagon::BI__builtin_HEXAGON_V6_vunpackob_128B, {"v60", "v62", "v65"} },
2507     { Hexagon::BI__builtin_HEXAGON_V6_vunpackoh, {"v60", "v62", "v65"} },
2508     { Hexagon::BI__builtin_HEXAGON_V6_vunpackoh_128B, {"v60", "v62", "v65"} },
2509     { Hexagon::BI__builtin_HEXAGON_V6_vunpackub, {"v60", "v62", "v65"} },
2510     { Hexagon::BI__builtin_HEXAGON_V6_vunpackub_128B, {"v60", "v62", "v65"} },
2511     { Hexagon::BI__builtin_HEXAGON_V6_vunpackuh, {"v60", "v62", "v65"} },
2512     { Hexagon::BI__builtin_HEXAGON_V6_vunpackuh_128B, {"v60", "v62", "v65"} },
2513     { Hexagon::BI__builtin_HEXAGON_V6_vxor, {"v60", "v62", "v65"} },
2514     { Hexagon::BI__builtin_HEXAGON_V6_vxor_128B, {"v60", "v62", "v65"} },
2515     { Hexagon::BI__builtin_HEXAGON_V6_vzb, {"v60", "v62", "v65"} },
2516     { Hexagon::BI__builtin_HEXAGON_V6_vzb_128B, {"v60", "v62", "v65"} },
2517     { Hexagon::BI__builtin_HEXAGON_V6_vzh, {"v60", "v62", "v65"} },
2518     { Hexagon::BI__builtin_HEXAGON_V6_vzh_128B, {"v60", "v62", "v65"} },
2519   };
2520 
2521   const TargetInfo &TI = Context.getTargetInfo();
2522 
2523   auto FC = ValidCPU.find(BuiltinID);
2524   if (FC != ValidCPU.end()) {
2525     const TargetOptions &Opts = TI.getTargetOpts();
2526     StringRef CPU = Opts.CPU;
2527     if (!CPU.empty()) {
2528       assert(CPU.startswith("hexagon") && "Unexpected CPU name");
2529       CPU.consume_front("hexagon");
2530       if (llvm::none_of(FC->second, [CPU](StringRef S) { return S == CPU; }))
2531         return Diag(TheCall->getBeginLoc(),
2532                     diag::err_hexagon_builtin_unsupported_cpu);
2533     }
2534   }
2535 
2536   auto FH = ValidHVX.find(BuiltinID);
2537   if (FH != ValidHVX.end()) {
2538     if (!TI.hasFeature("hvx"))
2539       return Diag(TheCall->getBeginLoc(),
2540                   diag::err_hexagon_builtin_requires_hvx);
2541 
2542     bool IsValid = llvm::any_of(FH->second,
2543                                 [&TI] (StringRef V) {
2544                                   std::string F = "hvx" + V.str();
2545                                   return TI.hasFeature(F);
2546                                 });
2547     if (!IsValid)
2548       return Diag(TheCall->getBeginLoc(),
2549                   diag::err_hexagon_builtin_unsupported_hvx);
2550   }
2551 
2552   return false;
2553 }
2554 
2555 bool Sema::CheckHexagonBuiltinArgument(unsigned BuiltinID, CallExpr *TheCall) {
2556   struct ArgInfo {
2557     ArgInfo(unsigned O, bool S, unsigned W, unsigned A)
2558       : OpNum(O), IsSigned(S), BitWidth(W), Align(A) {}
2559     unsigned OpNum = 0;
2560     bool IsSigned = false;
2561     unsigned BitWidth = 0;
2562     unsigned Align = 0;
2563   };
2564 
2565   static const std::map<unsigned, std::vector<ArgInfo>> Infos = {
2566     { Hexagon::BI__builtin_circ_ldd,                  {{ 3, true,  4,  3 }} },
2567     { Hexagon::BI__builtin_circ_ldw,                  {{ 3, true,  4,  2 }} },
2568     { Hexagon::BI__builtin_circ_ldh,                  {{ 3, true,  4,  1 }} },
2569     { Hexagon::BI__builtin_circ_lduh,                 {{ 3, true,  4,  0 }} },
2570     { Hexagon::BI__builtin_circ_ldb,                  {{ 3, true,  4,  0 }} },
2571     { Hexagon::BI__builtin_circ_ldub,                 {{ 3, true,  4,  0 }} },
2572     { Hexagon::BI__builtin_circ_std,                  {{ 3, true,  4,  3 }} },
2573     { Hexagon::BI__builtin_circ_stw,                  {{ 3, true,  4,  2 }} },
2574     { Hexagon::BI__builtin_circ_sth,                  {{ 3, true,  4,  1 }} },
2575     { Hexagon::BI__builtin_circ_sthhi,                {{ 3, true,  4,  1 }} },
2576     { Hexagon::BI__builtin_circ_stb,                  {{ 3, true,  4,  0 }} },
2577 
2578     { Hexagon::BI__builtin_HEXAGON_L2_loadrub_pci,    {{ 1, true,  4,  0 }} },
2579     { Hexagon::BI__builtin_HEXAGON_L2_loadrb_pci,     {{ 1, true,  4,  0 }} },
2580     { Hexagon::BI__builtin_HEXAGON_L2_loadruh_pci,    {{ 1, true,  4,  1 }} },
2581     { Hexagon::BI__builtin_HEXAGON_L2_loadrh_pci,     {{ 1, true,  4,  1 }} },
2582     { Hexagon::BI__builtin_HEXAGON_L2_loadri_pci,     {{ 1, true,  4,  2 }} },
2583     { Hexagon::BI__builtin_HEXAGON_L2_loadrd_pci,     {{ 1, true,  4,  3 }} },
2584     { Hexagon::BI__builtin_HEXAGON_S2_storerb_pci,    {{ 1, true,  4,  0 }} },
2585     { Hexagon::BI__builtin_HEXAGON_S2_storerh_pci,    {{ 1, true,  4,  1 }} },
2586     { Hexagon::BI__builtin_HEXAGON_S2_storerf_pci,    {{ 1, true,  4,  1 }} },
2587     { Hexagon::BI__builtin_HEXAGON_S2_storeri_pci,    {{ 1, true,  4,  2 }} },
2588     { Hexagon::BI__builtin_HEXAGON_S2_storerd_pci,    {{ 1, true,  4,  3 }} },
2589 
2590     { Hexagon::BI__builtin_HEXAGON_A2_combineii,      {{ 1, true,  8,  0 }} },
2591     { Hexagon::BI__builtin_HEXAGON_A2_tfrih,          {{ 1, false, 16, 0 }} },
2592     { Hexagon::BI__builtin_HEXAGON_A2_tfril,          {{ 1, false, 16, 0 }} },
2593     { Hexagon::BI__builtin_HEXAGON_A2_tfrpi,          {{ 0, true,  8,  0 }} },
2594     { Hexagon::BI__builtin_HEXAGON_A4_bitspliti,      {{ 1, false, 5,  0 }} },
2595     { Hexagon::BI__builtin_HEXAGON_A4_cmpbeqi,        {{ 1, false, 8,  0 }} },
2596     { Hexagon::BI__builtin_HEXAGON_A4_cmpbgti,        {{ 1, true,  8,  0 }} },
2597     { Hexagon::BI__builtin_HEXAGON_A4_cround_ri,      {{ 1, false, 5,  0 }} },
2598     { Hexagon::BI__builtin_HEXAGON_A4_round_ri,       {{ 1, false, 5,  0 }} },
2599     { Hexagon::BI__builtin_HEXAGON_A4_round_ri_sat,   {{ 1, false, 5,  0 }} },
2600     { Hexagon::BI__builtin_HEXAGON_A4_vcmpbeqi,       {{ 1, false, 8,  0 }} },
2601     { Hexagon::BI__builtin_HEXAGON_A4_vcmpbgti,       {{ 1, true,  8,  0 }} },
2602     { Hexagon::BI__builtin_HEXAGON_A4_vcmpbgtui,      {{ 1, false, 7,  0 }} },
2603     { Hexagon::BI__builtin_HEXAGON_A4_vcmpheqi,       {{ 1, true,  8,  0 }} },
2604     { Hexagon::BI__builtin_HEXAGON_A4_vcmphgti,       {{ 1, true,  8,  0 }} },
2605     { Hexagon::BI__builtin_HEXAGON_A4_vcmphgtui,      {{ 1, false, 7,  0 }} },
2606     { Hexagon::BI__builtin_HEXAGON_A4_vcmpweqi,       {{ 1, true,  8,  0 }} },
2607     { Hexagon::BI__builtin_HEXAGON_A4_vcmpwgti,       {{ 1, true,  8,  0 }} },
2608     { Hexagon::BI__builtin_HEXAGON_A4_vcmpwgtui,      {{ 1, false, 7,  0 }} },
2609     { Hexagon::BI__builtin_HEXAGON_C2_bitsclri,       {{ 1, false, 6,  0 }} },
2610     { Hexagon::BI__builtin_HEXAGON_C2_muxii,          {{ 2, true,  8,  0 }} },
2611     { Hexagon::BI__builtin_HEXAGON_C4_nbitsclri,      {{ 1, false, 6,  0 }} },
2612     { Hexagon::BI__builtin_HEXAGON_F2_dfclass,        {{ 1, false, 5,  0 }} },
2613     { Hexagon::BI__builtin_HEXAGON_F2_dfimm_n,        {{ 0, false, 10, 0 }} },
2614     { Hexagon::BI__builtin_HEXAGON_F2_dfimm_p,        {{ 0, false, 10, 0 }} },
2615     { Hexagon::BI__builtin_HEXAGON_F2_sfclass,        {{ 1, false, 5,  0 }} },
2616     { Hexagon::BI__builtin_HEXAGON_F2_sfimm_n,        {{ 0, false, 10, 0 }} },
2617     { Hexagon::BI__builtin_HEXAGON_F2_sfimm_p,        {{ 0, false, 10, 0 }} },
2618     { Hexagon::BI__builtin_HEXAGON_M4_mpyri_addi,     {{ 2, false, 6,  0 }} },
2619     { Hexagon::BI__builtin_HEXAGON_M4_mpyri_addr_u2,  {{ 1, false, 6,  2 }} },
2620     { Hexagon::BI__builtin_HEXAGON_S2_addasl_rrri,    {{ 2, false, 3,  0 }} },
2621     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_acc,    {{ 2, false, 6,  0 }} },
2622     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_and,    {{ 2, false, 6,  0 }} },
2623     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p,        {{ 1, false, 6,  0 }} },
2624     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_nac,    {{ 2, false, 6,  0 }} },
2625     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_or,     {{ 2, false, 6,  0 }} },
2626     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_p_xacc,   {{ 2, false, 6,  0 }} },
2627     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_acc,    {{ 2, false, 5,  0 }} },
2628     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_and,    {{ 2, false, 5,  0 }} },
2629     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r,        {{ 1, false, 5,  0 }} },
2630     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_nac,    {{ 2, false, 5,  0 }} },
2631     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_or,     {{ 2, false, 5,  0 }} },
2632     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_sat,    {{ 1, false, 5,  0 }} },
2633     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_r_xacc,   {{ 2, false, 5,  0 }} },
2634     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_vh,       {{ 1, false, 4,  0 }} },
2635     { Hexagon::BI__builtin_HEXAGON_S2_asl_i_vw,       {{ 1, false, 5,  0 }} },
2636     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_acc,    {{ 2, false, 6,  0 }} },
2637     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_and,    {{ 2, false, 6,  0 }} },
2638     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p,        {{ 1, false, 6,  0 }} },
2639     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_nac,    {{ 2, false, 6,  0 }} },
2640     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_or,     {{ 2, false, 6,  0 }} },
2641     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_rnd_goodsyntax,
2642                                                       {{ 1, false, 6,  0 }} },
2643     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_p_rnd,    {{ 1, false, 6,  0 }} },
2644     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_acc,    {{ 2, false, 5,  0 }} },
2645     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_and,    {{ 2, false, 5,  0 }} },
2646     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r,        {{ 1, false, 5,  0 }} },
2647     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_nac,    {{ 2, false, 5,  0 }} },
2648     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_or,     {{ 2, false, 5,  0 }} },
2649     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_rnd_goodsyntax,
2650                                                       {{ 1, false, 5,  0 }} },
2651     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_r_rnd,    {{ 1, false, 5,  0 }} },
2652     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_svw_trun, {{ 1, false, 5,  0 }} },
2653     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_vh,       {{ 1, false, 4,  0 }} },
2654     { Hexagon::BI__builtin_HEXAGON_S2_asr_i_vw,       {{ 1, false, 5,  0 }} },
2655     { Hexagon::BI__builtin_HEXAGON_S2_clrbit_i,       {{ 1, false, 5,  0 }} },
2656     { Hexagon::BI__builtin_HEXAGON_S2_extractu,       {{ 1, false, 5,  0 },
2657                                                        { 2, false, 5,  0 }} },
2658     { Hexagon::BI__builtin_HEXAGON_S2_extractup,      {{ 1, false, 6,  0 },
2659                                                        { 2, false, 6,  0 }} },
2660     { Hexagon::BI__builtin_HEXAGON_S2_insert,         {{ 2, false, 5,  0 },
2661                                                        { 3, false, 5,  0 }} },
2662     { Hexagon::BI__builtin_HEXAGON_S2_insertp,        {{ 2, false, 6,  0 },
2663                                                        { 3, false, 6,  0 }} },
2664     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_acc,    {{ 2, false, 6,  0 }} },
2665     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_and,    {{ 2, false, 6,  0 }} },
2666     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p,        {{ 1, false, 6,  0 }} },
2667     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_nac,    {{ 2, false, 6,  0 }} },
2668     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_or,     {{ 2, false, 6,  0 }} },
2669     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_p_xacc,   {{ 2, false, 6,  0 }} },
2670     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_acc,    {{ 2, false, 5,  0 }} },
2671     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_and,    {{ 2, false, 5,  0 }} },
2672     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r,        {{ 1, false, 5,  0 }} },
2673     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_nac,    {{ 2, false, 5,  0 }} },
2674     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_or,     {{ 2, false, 5,  0 }} },
2675     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_r_xacc,   {{ 2, false, 5,  0 }} },
2676     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_vh,       {{ 1, false, 4,  0 }} },
2677     { Hexagon::BI__builtin_HEXAGON_S2_lsr_i_vw,       {{ 1, false, 5,  0 }} },
2678     { Hexagon::BI__builtin_HEXAGON_S2_setbit_i,       {{ 1, false, 5,  0 }} },
2679     { Hexagon::BI__builtin_HEXAGON_S2_tableidxb_goodsyntax,
2680                                                       {{ 2, false, 4,  0 },
2681                                                        { 3, false, 5,  0 }} },
2682     { Hexagon::BI__builtin_HEXAGON_S2_tableidxd_goodsyntax,
2683                                                       {{ 2, false, 4,  0 },
2684                                                        { 3, false, 5,  0 }} },
2685     { Hexagon::BI__builtin_HEXAGON_S2_tableidxh_goodsyntax,
2686                                                       {{ 2, false, 4,  0 },
2687                                                        { 3, false, 5,  0 }} },
2688     { Hexagon::BI__builtin_HEXAGON_S2_tableidxw_goodsyntax,
2689                                                       {{ 2, false, 4,  0 },
2690                                                        { 3, false, 5,  0 }} },
2691     { Hexagon::BI__builtin_HEXAGON_S2_togglebit_i,    {{ 1, false, 5,  0 }} },
2692     { Hexagon::BI__builtin_HEXAGON_S2_tstbit_i,       {{ 1, false, 5,  0 }} },
2693     { Hexagon::BI__builtin_HEXAGON_S2_valignib,       {{ 2, false, 3,  0 }} },
2694     { Hexagon::BI__builtin_HEXAGON_S2_vspliceib,      {{ 2, false, 3,  0 }} },
2695     { Hexagon::BI__builtin_HEXAGON_S4_addi_asl_ri,    {{ 2, false, 5,  0 }} },
2696     { Hexagon::BI__builtin_HEXAGON_S4_addi_lsr_ri,    {{ 2, false, 5,  0 }} },
2697     { Hexagon::BI__builtin_HEXAGON_S4_andi_asl_ri,    {{ 2, false, 5,  0 }} },
2698     { Hexagon::BI__builtin_HEXAGON_S4_andi_lsr_ri,    {{ 2, false, 5,  0 }} },
2699     { Hexagon::BI__builtin_HEXAGON_S4_clbaddi,        {{ 1, true , 6,  0 }} },
2700     { Hexagon::BI__builtin_HEXAGON_S4_clbpaddi,       {{ 1, true,  6,  0 }} },
2701     { Hexagon::BI__builtin_HEXAGON_S4_extract,        {{ 1, false, 5,  0 },
2702                                                        { 2, false, 5,  0 }} },
2703     { Hexagon::BI__builtin_HEXAGON_S4_extractp,       {{ 1, false, 6,  0 },
2704                                                        { 2, false, 6,  0 }} },
2705     { Hexagon::BI__builtin_HEXAGON_S4_lsli,           {{ 0, true,  6,  0 }} },
2706     { Hexagon::BI__builtin_HEXAGON_S4_ntstbit_i,      {{ 1, false, 5,  0 }} },
2707     { Hexagon::BI__builtin_HEXAGON_S4_ori_asl_ri,     {{ 2, false, 5,  0 }} },
2708     { Hexagon::BI__builtin_HEXAGON_S4_ori_lsr_ri,     {{ 2, false, 5,  0 }} },
2709     { Hexagon::BI__builtin_HEXAGON_S4_subi_asl_ri,    {{ 2, false, 5,  0 }} },
2710     { Hexagon::BI__builtin_HEXAGON_S4_subi_lsr_ri,    {{ 2, false, 5,  0 }} },
2711     { Hexagon::BI__builtin_HEXAGON_S4_vrcrotate_acc,  {{ 3, false, 2,  0 }} },
2712     { Hexagon::BI__builtin_HEXAGON_S4_vrcrotate,      {{ 2, false, 2,  0 }} },
2713     { Hexagon::BI__builtin_HEXAGON_S5_asrhub_rnd_sat_goodsyntax,
2714                                                       {{ 1, false, 4,  0 }} },
2715     { Hexagon::BI__builtin_HEXAGON_S5_asrhub_sat,     {{ 1, false, 4,  0 }} },
2716     { Hexagon::BI__builtin_HEXAGON_S5_vasrhrnd_goodsyntax,
2717                                                       {{ 1, false, 4,  0 }} },
2718     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p,        {{ 1, false, 6,  0 }} },
2719     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_acc,    {{ 2, false, 6,  0 }} },
2720     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_and,    {{ 2, false, 6,  0 }} },
2721     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_nac,    {{ 2, false, 6,  0 }} },
2722     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_or,     {{ 2, false, 6,  0 }} },
2723     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_p_xacc,   {{ 2, false, 6,  0 }} },
2724     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r,        {{ 1, false, 5,  0 }} },
2725     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_acc,    {{ 2, false, 5,  0 }} },
2726     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_and,    {{ 2, false, 5,  0 }} },
2727     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_nac,    {{ 2, false, 5,  0 }} },
2728     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_or,     {{ 2, false, 5,  0 }} },
2729     { Hexagon::BI__builtin_HEXAGON_S6_rol_i_r_xacc,   {{ 2, false, 5,  0 }} },
2730     { Hexagon::BI__builtin_HEXAGON_V6_valignbi,       {{ 2, false, 3,  0 }} },
2731     { Hexagon::BI__builtin_HEXAGON_V6_valignbi_128B,  {{ 2, false, 3,  0 }} },
2732     { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi,      {{ 2, false, 3,  0 }} },
2733     { Hexagon::BI__builtin_HEXAGON_V6_vlalignbi_128B, {{ 2, false, 3,  0 }} },
2734     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi,      {{ 2, false, 1,  0 }} },
2735     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_128B, {{ 2, false, 1,  0 }} },
2736     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc,  {{ 3, false, 1,  0 }} },
2737     { Hexagon::BI__builtin_HEXAGON_V6_vrmpybusi_acc_128B,
2738                                                       {{ 3, false, 1,  0 }} },
2739     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi,       {{ 2, false, 1,  0 }} },
2740     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_128B,  {{ 2, false, 1,  0 }} },
2741     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc,   {{ 3, false, 1,  0 }} },
2742     { Hexagon::BI__builtin_HEXAGON_V6_vrmpyubi_acc_128B,
2743                                                       {{ 3, false, 1,  0 }} },
2744     { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi,       {{ 2, false, 1,  0 }} },
2745     { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_128B,  {{ 2, false, 1,  0 }} },
2746     { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc,   {{ 3, false, 1,  0 }} },
2747     { Hexagon::BI__builtin_HEXAGON_V6_vrsadubi_acc_128B,
2748                                                       {{ 3, false, 1,  0 }} },
2749   };
2750 
2751   auto F = Infos.find(BuiltinID);
2752   if (F == Infos.end())
2753     return false;
2754 
2755   bool Error = false;
2756 
2757   for (const ArgInfo &A : F->second) {
2758     int32_t Min = A.IsSigned ? -(1 << (A.BitWidth-1)) : 0;
2759     int32_t Max = (1 << (A.IsSigned ? A.BitWidth-1 : A.BitWidth)) - 1;
2760     if (!A.Align) {
2761       Error |= SemaBuiltinConstantArgRange(TheCall, A.OpNum, Min, Max);
2762     } else {
2763       unsigned M = 1 << A.Align;
2764       Min *= M;
2765       Max *= M;
2766       Error |= SemaBuiltinConstantArgRange(TheCall, A.OpNum, Min, Max) |
2767                SemaBuiltinConstantArgMultiple(TheCall, A.OpNum, M);
2768     }
2769   }
2770   return Error;
2771 }
2772 
2773 bool Sema::CheckHexagonBuiltinFunctionCall(unsigned BuiltinID,
2774                                            CallExpr *TheCall) {
2775   return CheckHexagonBuiltinCpu(BuiltinID, TheCall) ||
2776          CheckHexagonBuiltinArgument(BuiltinID, TheCall);
2777 }
2778 
2779 
2780 // CheckMipsBuiltinFunctionCall - Checks the constant value passed to the
2781 // intrinsic is correct. The switch statement is ordered by DSP, MSA. The
2782 // ordering for DSP is unspecified. MSA is ordered by the data format used
2783 // by the underlying instruction i.e., df/m, df/n and then by size.
2784 //
2785 // FIXME: The size tests here should instead be tablegen'd along with the
2786 //        definitions from include/clang/Basic/BuiltinsMips.def.
2787 // FIXME: GCC is strict on signedness for some of these intrinsics, we should
2788 //        be too.
2789 bool Sema::CheckMipsBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
2790   unsigned i = 0, l = 0, u = 0, m = 0;
2791   switch (BuiltinID) {
2792   default: return false;
2793   case Mips::BI__builtin_mips_wrdsp: i = 1; l = 0; u = 63; break;
2794   case Mips::BI__builtin_mips_rddsp: i = 0; l = 0; u = 63; break;
2795   case Mips::BI__builtin_mips_append: i = 2; l = 0; u = 31; break;
2796   case Mips::BI__builtin_mips_balign: i = 2; l = 0; u = 3; break;
2797   case Mips::BI__builtin_mips_precr_sra_ph_w: i = 2; l = 0; u = 31; break;
2798   case Mips::BI__builtin_mips_precr_sra_r_ph_w: i = 2; l = 0; u = 31; break;
2799   case Mips::BI__builtin_mips_prepend: i = 2; l = 0; u = 31; break;
2800   // MSA instrinsics. Instructions (which the intrinsics maps to) which use the
2801   // df/m field.
2802   // These intrinsics take an unsigned 3 bit immediate.
2803   case Mips::BI__builtin_msa_bclri_b:
2804   case Mips::BI__builtin_msa_bnegi_b:
2805   case Mips::BI__builtin_msa_bseti_b:
2806   case Mips::BI__builtin_msa_sat_s_b:
2807   case Mips::BI__builtin_msa_sat_u_b:
2808   case Mips::BI__builtin_msa_slli_b:
2809   case Mips::BI__builtin_msa_srai_b:
2810   case Mips::BI__builtin_msa_srari_b:
2811   case Mips::BI__builtin_msa_srli_b:
2812   case Mips::BI__builtin_msa_srlri_b: i = 1; l = 0; u = 7; break;
2813   case Mips::BI__builtin_msa_binsli_b:
2814   case Mips::BI__builtin_msa_binsri_b: i = 2; l = 0; u = 7; break;
2815   // These intrinsics take an unsigned 4 bit immediate.
2816   case Mips::BI__builtin_msa_bclri_h:
2817   case Mips::BI__builtin_msa_bnegi_h:
2818   case Mips::BI__builtin_msa_bseti_h:
2819   case Mips::BI__builtin_msa_sat_s_h:
2820   case Mips::BI__builtin_msa_sat_u_h:
2821   case Mips::BI__builtin_msa_slli_h:
2822   case Mips::BI__builtin_msa_srai_h:
2823   case Mips::BI__builtin_msa_srari_h:
2824   case Mips::BI__builtin_msa_srli_h:
2825   case Mips::BI__builtin_msa_srlri_h: i = 1; l = 0; u = 15; break;
2826   case Mips::BI__builtin_msa_binsli_h:
2827   case Mips::BI__builtin_msa_binsri_h: i = 2; l = 0; u = 15; break;
2828   // These intrinsics take an unsigned 5 bit immediate.
2829   // The first block of intrinsics actually have an unsigned 5 bit field,
2830   // not a df/n field.
2831   case Mips::BI__builtin_msa_clei_u_b:
2832   case Mips::BI__builtin_msa_clei_u_h:
2833   case Mips::BI__builtin_msa_clei_u_w:
2834   case Mips::BI__builtin_msa_clei_u_d:
2835   case Mips::BI__builtin_msa_clti_u_b:
2836   case Mips::BI__builtin_msa_clti_u_h:
2837   case Mips::BI__builtin_msa_clti_u_w:
2838   case Mips::BI__builtin_msa_clti_u_d:
2839   case Mips::BI__builtin_msa_maxi_u_b:
2840   case Mips::BI__builtin_msa_maxi_u_h:
2841   case Mips::BI__builtin_msa_maxi_u_w:
2842   case Mips::BI__builtin_msa_maxi_u_d:
2843   case Mips::BI__builtin_msa_mini_u_b:
2844   case Mips::BI__builtin_msa_mini_u_h:
2845   case Mips::BI__builtin_msa_mini_u_w:
2846   case Mips::BI__builtin_msa_mini_u_d:
2847   case Mips::BI__builtin_msa_addvi_b:
2848   case Mips::BI__builtin_msa_addvi_h:
2849   case Mips::BI__builtin_msa_addvi_w:
2850   case Mips::BI__builtin_msa_addvi_d:
2851   case Mips::BI__builtin_msa_bclri_w:
2852   case Mips::BI__builtin_msa_bnegi_w:
2853   case Mips::BI__builtin_msa_bseti_w:
2854   case Mips::BI__builtin_msa_sat_s_w:
2855   case Mips::BI__builtin_msa_sat_u_w:
2856   case Mips::BI__builtin_msa_slli_w:
2857   case Mips::BI__builtin_msa_srai_w:
2858   case Mips::BI__builtin_msa_srari_w:
2859   case Mips::BI__builtin_msa_srli_w:
2860   case Mips::BI__builtin_msa_srlri_w:
2861   case Mips::BI__builtin_msa_subvi_b:
2862   case Mips::BI__builtin_msa_subvi_h:
2863   case Mips::BI__builtin_msa_subvi_w:
2864   case Mips::BI__builtin_msa_subvi_d: i = 1; l = 0; u = 31; break;
2865   case Mips::BI__builtin_msa_binsli_w:
2866   case Mips::BI__builtin_msa_binsri_w: i = 2; l = 0; u = 31; break;
2867   // These intrinsics take an unsigned 6 bit immediate.
2868   case Mips::BI__builtin_msa_bclri_d:
2869   case Mips::BI__builtin_msa_bnegi_d:
2870   case Mips::BI__builtin_msa_bseti_d:
2871   case Mips::BI__builtin_msa_sat_s_d:
2872   case Mips::BI__builtin_msa_sat_u_d:
2873   case Mips::BI__builtin_msa_slli_d:
2874   case Mips::BI__builtin_msa_srai_d:
2875   case Mips::BI__builtin_msa_srari_d:
2876   case Mips::BI__builtin_msa_srli_d:
2877   case Mips::BI__builtin_msa_srlri_d: i = 1; l = 0; u = 63; break;
2878   case Mips::BI__builtin_msa_binsli_d:
2879   case Mips::BI__builtin_msa_binsri_d: i = 2; l = 0; u = 63; break;
2880   // These intrinsics take a signed 5 bit immediate.
2881   case Mips::BI__builtin_msa_ceqi_b:
2882   case Mips::BI__builtin_msa_ceqi_h:
2883   case Mips::BI__builtin_msa_ceqi_w:
2884   case Mips::BI__builtin_msa_ceqi_d:
2885   case Mips::BI__builtin_msa_clti_s_b:
2886   case Mips::BI__builtin_msa_clti_s_h:
2887   case Mips::BI__builtin_msa_clti_s_w:
2888   case Mips::BI__builtin_msa_clti_s_d:
2889   case Mips::BI__builtin_msa_clei_s_b:
2890   case Mips::BI__builtin_msa_clei_s_h:
2891   case Mips::BI__builtin_msa_clei_s_w:
2892   case Mips::BI__builtin_msa_clei_s_d:
2893   case Mips::BI__builtin_msa_maxi_s_b:
2894   case Mips::BI__builtin_msa_maxi_s_h:
2895   case Mips::BI__builtin_msa_maxi_s_w:
2896   case Mips::BI__builtin_msa_maxi_s_d:
2897   case Mips::BI__builtin_msa_mini_s_b:
2898   case Mips::BI__builtin_msa_mini_s_h:
2899   case Mips::BI__builtin_msa_mini_s_w:
2900   case Mips::BI__builtin_msa_mini_s_d: i = 1; l = -16; u = 15; break;
2901   // These intrinsics take an unsigned 8 bit immediate.
2902   case Mips::BI__builtin_msa_andi_b:
2903   case Mips::BI__builtin_msa_nori_b:
2904   case Mips::BI__builtin_msa_ori_b:
2905   case Mips::BI__builtin_msa_shf_b:
2906   case Mips::BI__builtin_msa_shf_h:
2907   case Mips::BI__builtin_msa_shf_w:
2908   case Mips::BI__builtin_msa_xori_b: i = 1; l = 0; u = 255; break;
2909   case Mips::BI__builtin_msa_bseli_b:
2910   case Mips::BI__builtin_msa_bmnzi_b:
2911   case Mips::BI__builtin_msa_bmzi_b: i = 2; l = 0; u = 255; break;
2912   // df/n format
2913   // These intrinsics take an unsigned 4 bit immediate.
2914   case Mips::BI__builtin_msa_copy_s_b:
2915   case Mips::BI__builtin_msa_copy_u_b:
2916   case Mips::BI__builtin_msa_insve_b:
2917   case Mips::BI__builtin_msa_splati_b: i = 1; l = 0; u = 15; break;
2918   case Mips::BI__builtin_msa_sldi_b: i = 2; l = 0; u = 15; break;
2919   // These intrinsics take an unsigned 3 bit immediate.
2920   case Mips::BI__builtin_msa_copy_s_h:
2921   case Mips::BI__builtin_msa_copy_u_h:
2922   case Mips::BI__builtin_msa_insve_h:
2923   case Mips::BI__builtin_msa_splati_h: i = 1; l = 0; u = 7; break;
2924   case Mips::BI__builtin_msa_sldi_h: i = 2; l = 0; u = 7; break;
2925   // These intrinsics take an unsigned 2 bit immediate.
2926   case Mips::BI__builtin_msa_copy_s_w:
2927   case Mips::BI__builtin_msa_copy_u_w:
2928   case Mips::BI__builtin_msa_insve_w:
2929   case Mips::BI__builtin_msa_splati_w: i = 1; l = 0; u = 3; break;
2930   case Mips::BI__builtin_msa_sldi_w: i = 2; l = 0; u = 3; break;
2931   // These intrinsics take an unsigned 1 bit immediate.
2932   case Mips::BI__builtin_msa_copy_s_d:
2933   case Mips::BI__builtin_msa_copy_u_d:
2934   case Mips::BI__builtin_msa_insve_d:
2935   case Mips::BI__builtin_msa_splati_d: i = 1; l = 0; u = 1; break;
2936   case Mips::BI__builtin_msa_sldi_d: i = 2; l = 0; u = 1; break;
2937   // Memory offsets and immediate loads.
2938   // These intrinsics take a signed 10 bit immediate.
2939   case Mips::BI__builtin_msa_ldi_b: i = 0; l = -128; u = 255; break;
2940   case Mips::BI__builtin_msa_ldi_h:
2941   case Mips::BI__builtin_msa_ldi_w:
2942   case Mips::BI__builtin_msa_ldi_d: i = 0; l = -512; u = 511; break;
2943   case Mips::BI__builtin_msa_ld_b: i = 1; l = -512; u = 511; m = 16; break;
2944   case Mips::BI__builtin_msa_ld_h: i = 1; l = -1024; u = 1022; m = 16; break;
2945   case Mips::BI__builtin_msa_ld_w: i = 1; l = -2048; u = 2044; m = 16; break;
2946   case Mips::BI__builtin_msa_ld_d: i = 1; l = -4096; u = 4088; m = 16; break;
2947   case Mips::BI__builtin_msa_st_b: i = 2; l = -512; u = 511; m = 16; break;
2948   case Mips::BI__builtin_msa_st_h: i = 2; l = -1024; u = 1022; m = 16; break;
2949   case Mips::BI__builtin_msa_st_w: i = 2; l = -2048; u = 2044; m = 16; break;
2950   case Mips::BI__builtin_msa_st_d: i = 2; l = -4096; u = 4088; m = 16; break;
2951   }
2952 
2953   if (!m)
2954     return SemaBuiltinConstantArgRange(TheCall, i, l, u);
2955 
2956   return SemaBuiltinConstantArgRange(TheCall, i, l, u) ||
2957          SemaBuiltinConstantArgMultiple(TheCall, i, m);
2958 }
2959 
2960 bool Sema::CheckPPCBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
2961   unsigned i = 0, l = 0, u = 0;
2962   bool Is64BitBltin = BuiltinID == PPC::BI__builtin_divde ||
2963                       BuiltinID == PPC::BI__builtin_divdeu ||
2964                       BuiltinID == PPC::BI__builtin_bpermd;
2965   bool IsTarget64Bit = Context.getTargetInfo()
2966                               .getTypeWidth(Context
2967                                             .getTargetInfo()
2968                                             .getIntPtrType()) == 64;
2969   bool IsBltinExtDiv = BuiltinID == PPC::BI__builtin_divwe ||
2970                        BuiltinID == PPC::BI__builtin_divweu ||
2971                        BuiltinID == PPC::BI__builtin_divde ||
2972                        BuiltinID == PPC::BI__builtin_divdeu;
2973 
2974   if (Is64BitBltin && !IsTarget64Bit)
2975     return Diag(TheCall->getBeginLoc(), diag::err_64_bit_builtin_32_bit_tgt)
2976            << TheCall->getSourceRange();
2977 
2978   if ((IsBltinExtDiv && !Context.getTargetInfo().hasFeature("extdiv")) ||
2979       (BuiltinID == PPC::BI__builtin_bpermd &&
2980        !Context.getTargetInfo().hasFeature("bpermd")))
2981     return Diag(TheCall->getBeginLoc(), diag::err_ppc_builtin_only_on_pwr7)
2982            << TheCall->getSourceRange();
2983 
2984   auto SemaVSXCheck = [&](CallExpr *TheCall) -> bool {
2985     if (!Context.getTargetInfo().hasFeature("vsx"))
2986       return Diag(TheCall->getBeginLoc(), diag::err_ppc_builtin_only_on_pwr7)
2987              << TheCall->getSourceRange();
2988     return false;
2989   };
2990 
2991   switch (BuiltinID) {
2992   default: return false;
2993   case PPC::BI__builtin_altivec_crypto_vshasigmaw:
2994   case PPC::BI__builtin_altivec_crypto_vshasigmad:
2995     return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
2996            SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
2997   case PPC::BI__builtin_tbegin:
2998   case PPC::BI__builtin_tend: i = 0; l = 0; u = 1; break;
2999   case PPC::BI__builtin_tsr: i = 0; l = 0; u = 7; break;
3000   case PPC::BI__builtin_tabortwc:
3001   case PPC::BI__builtin_tabortdc: i = 0; l = 0; u = 31; break;
3002   case PPC::BI__builtin_tabortwci:
3003   case PPC::BI__builtin_tabortdci:
3004     return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31) ||
3005            SemaBuiltinConstantArgRange(TheCall, 2, 0, 31);
3006   case PPC::BI__builtin_vsx_xxpermdi:
3007   case PPC::BI__builtin_vsx_xxsldwi:
3008     return SemaBuiltinVSX(TheCall);
3009   case PPC::BI__builtin_unpack_vector_int128:
3010     return SemaVSXCheck(TheCall) ||
3011            SemaBuiltinConstantArgRange(TheCall, 1, 0, 1);
3012   case PPC::BI__builtin_pack_vector_int128:
3013     return SemaVSXCheck(TheCall);
3014   }
3015   return SemaBuiltinConstantArgRange(TheCall, i, l, u);
3016 }
3017 
3018 bool Sema::CheckSystemZBuiltinFunctionCall(unsigned BuiltinID,
3019                                            CallExpr *TheCall) {
3020   if (BuiltinID == SystemZ::BI__builtin_tabort) {
3021     Expr *Arg = TheCall->getArg(0);
3022     llvm::APSInt AbortCode(32);
3023     if (Arg->isIntegerConstantExpr(AbortCode, Context) &&
3024         AbortCode.getSExtValue() >= 0 && AbortCode.getSExtValue() < 256)
3025       return Diag(Arg->getBeginLoc(), diag::err_systemz_invalid_tabort_code)
3026              << Arg->getSourceRange();
3027   }
3028 
3029   // For intrinsics which take an immediate value as part of the instruction,
3030   // range check them here.
3031   unsigned i = 0, l = 0, u = 0;
3032   switch (BuiltinID) {
3033   default: return false;
3034   case SystemZ::BI__builtin_s390_lcbb: i = 1; l = 0; u = 15; break;
3035   case SystemZ::BI__builtin_s390_verimb:
3036   case SystemZ::BI__builtin_s390_verimh:
3037   case SystemZ::BI__builtin_s390_verimf:
3038   case SystemZ::BI__builtin_s390_verimg: i = 3; l = 0; u = 255; break;
3039   case SystemZ::BI__builtin_s390_vfaeb:
3040   case SystemZ::BI__builtin_s390_vfaeh:
3041   case SystemZ::BI__builtin_s390_vfaef:
3042   case SystemZ::BI__builtin_s390_vfaebs:
3043   case SystemZ::BI__builtin_s390_vfaehs:
3044   case SystemZ::BI__builtin_s390_vfaefs:
3045   case SystemZ::BI__builtin_s390_vfaezb:
3046   case SystemZ::BI__builtin_s390_vfaezh:
3047   case SystemZ::BI__builtin_s390_vfaezf:
3048   case SystemZ::BI__builtin_s390_vfaezbs:
3049   case SystemZ::BI__builtin_s390_vfaezhs:
3050   case SystemZ::BI__builtin_s390_vfaezfs: i = 2; l = 0; u = 15; break;
3051   case SystemZ::BI__builtin_s390_vfisb:
3052   case SystemZ::BI__builtin_s390_vfidb:
3053     return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15) ||
3054            SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
3055   case SystemZ::BI__builtin_s390_vftcisb:
3056   case SystemZ::BI__builtin_s390_vftcidb: i = 1; l = 0; u = 4095; break;
3057   case SystemZ::BI__builtin_s390_vlbb: i = 1; l = 0; u = 15; break;
3058   case SystemZ::BI__builtin_s390_vpdi: i = 2; l = 0; u = 15; break;
3059   case SystemZ::BI__builtin_s390_vsldb: i = 2; l = 0; u = 15; break;
3060   case SystemZ::BI__builtin_s390_vstrcb:
3061   case SystemZ::BI__builtin_s390_vstrch:
3062   case SystemZ::BI__builtin_s390_vstrcf:
3063   case SystemZ::BI__builtin_s390_vstrczb:
3064   case SystemZ::BI__builtin_s390_vstrczh:
3065   case SystemZ::BI__builtin_s390_vstrczf:
3066   case SystemZ::BI__builtin_s390_vstrcbs:
3067   case SystemZ::BI__builtin_s390_vstrchs:
3068   case SystemZ::BI__builtin_s390_vstrcfs:
3069   case SystemZ::BI__builtin_s390_vstrczbs:
3070   case SystemZ::BI__builtin_s390_vstrczhs:
3071   case SystemZ::BI__builtin_s390_vstrczfs: i = 3; l = 0; u = 15; break;
3072   case SystemZ::BI__builtin_s390_vmslg: i = 3; l = 0; u = 15; break;
3073   case SystemZ::BI__builtin_s390_vfminsb:
3074   case SystemZ::BI__builtin_s390_vfmaxsb:
3075   case SystemZ::BI__builtin_s390_vfmindb:
3076   case SystemZ::BI__builtin_s390_vfmaxdb: i = 2; l = 0; u = 15; break;
3077   }
3078   return SemaBuiltinConstantArgRange(TheCall, i, l, u);
3079 }
3080 
3081 /// SemaBuiltinCpuSupports - Handle __builtin_cpu_supports(char *).
3082 /// This checks that the target supports __builtin_cpu_supports and
3083 /// that the string argument is constant and valid.
3084 static bool SemaBuiltinCpuSupports(Sema &S, CallExpr *TheCall) {
3085   Expr *Arg = TheCall->getArg(0);
3086 
3087   // Check if the argument is a string literal.
3088   if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
3089     return S.Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
3090            << Arg->getSourceRange();
3091 
3092   // Check the contents of the string.
3093   StringRef Feature =
3094       cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
3095   if (!S.Context.getTargetInfo().validateCpuSupports(Feature))
3096     return S.Diag(TheCall->getBeginLoc(), diag::err_invalid_cpu_supports)
3097            << Arg->getSourceRange();
3098   return false;
3099 }
3100 
3101 /// SemaBuiltinCpuIs - Handle __builtin_cpu_is(char *).
3102 /// This checks that the target supports __builtin_cpu_is and
3103 /// that the string argument is constant and valid.
3104 static bool SemaBuiltinCpuIs(Sema &S, CallExpr *TheCall) {
3105   Expr *Arg = TheCall->getArg(0);
3106 
3107   // Check if the argument is a string literal.
3108   if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
3109     return S.Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
3110            << Arg->getSourceRange();
3111 
3112   // Check the contents of the string.
3113   StringRef Feature =
3114       cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
3115   if (!S.Context.getTargetInfo().validateCpuIs(Feature))
3116     return S.Diag(TheCall->getBeginLoc(), diag::err_invalid_cpu_is)
3117            << Arg->getSourceRange();
3118   return false;
3119 }
3120 
3121 // Check if the rounding mode is legal.
3122 bool Sema::CheckX86BuiltinRoundingOrSAE(unsigned BuiltinID, CallExpr *TheCall) {
3123   // Indicates if this instruction has rounding control or just SAE.
3124   bool HasRC = false;
3125 
3126   unsigned ArgNum = 0;
3127   switch (BuiltinID) {
3128   default:
3129     return false;
3130   case X86::BI__builtin_ia32_vcvttsd2si32:
3131   case X86::BI__builtin_ia32_vcvttsd2si64:
3132   case X86::BI__builtin_ia32_vcvttsd2usi32:
3133   case X86::BI__builtin_ia32_vcvttsd2usi64:
3134   case X86::BI__builtin_ia32_vcvttss2si32:
3135   case X86::BI__builtin_ia32_vcvttss2si64:
3136   case X86::BI__builtin_ia32_vcvttss2usi32:
3137   case X86::BI__builtin_ia32_vcvttss2usi64:
3138     ArgNum = 1;
3139     break;
3140   case X86::BI__builtin_ia32_maxpd512:
3141   case X86::BI__builtin_ia32_maxps512:
3142   case X86::BI__builtin_ia32_minpd512:
3143   case X86::BI__builtin_ia32_minps512:
3144     ArgNum = 2;
3145     break;
3146   case X86::BI__builtin_ia32_cvtps2pd512_mask:
3147   case X86::BI__builtin_ia32_cvttpd2dq512_mask:
3148   case X86::BI__builtin_ia32_cvttpd2qq512_mask:
3149   case X86::BI__builtin_ia32_cvttpd2udq512_mask:
3150   case X86::BI__builtin_ia32_cvttpd2uqq512_mask:
3151   case X86::BI__builtin_ia32_cvttps2dq512_mask:
3152   case X86::BI__builtin_ia32_cvttps2qq512_mask:
3153   case X86::BI__builtin_ia32_cvttps2udq512_mask:
3154   case X86::BI__builtin_ia32_cvttps2uqq512_mask:
3155   case X86::BI__builtin_ia32_exp2pd_mask:
3156   case X86::BI__builtin_ia32_exp2ps_mask:
3157   case X86::BI__builtin_ia32_getexppd512_mask:
3158   case X86::BI__builtin_ia32_getexpps512_mask:
3159   case X86::BI__builtin_ia32_rcp28pd_mask:
3160   case X86::BI__builtin_ia32_rcp28ps_mask:
3161   case X86::BI__builtin_ia32_rsqrt28pd_mask:
3162   case X86::BI__builtin_ia32_rsqrt28ps_mask:
3163   case X86::BI__builtin_ia32_vcomisd:
3164   case X86::BI__builtin_ia32_vcomiss:
3165   case X86::BI__builtin_ia32_vcvtph2ps512_mask:
3166     ArgNum = 3;
3167     break;
3168   case X86::BI__builtin_ia32_cmppd512_mask:
3169   case X86::BI__builtin_ia32_cmpps512_mask:
3170   case X86::BI__builtin_ia32_cmpsd_mask:
3171   case X86::BI__builtin_ia32_cmpss_mask:
3172   case X86::BI__builtin_ia32_cvtss2sd_round_mask:
3173   case X86::BI__builtin_ia32_getexpsd128_round_mask:
3174   case X86::BI__builtin_ia32_getexpss128_round_mask:
3175   case X86::BI__builtin_ia32_maxsd_round_mask:
3176   case X86::BI__builtin_ia32_maxss_round_mask:
3177   case X86::BI__builtin_ia32_minsd_round_mask:
3178   case X86::BI__builtin_ia32_minss_round_mask:
3179   case X86::BI__builtin_ia32_rcp28sd_round_mask:
3180   case X86::BI__builtin_ia32_rcp28ss_round_mask:
3181   case X86::BI__builtin_ia32_reducepd512_mask:
3182   case X86::BI__builtin_ia32_reduceps512_mask:
3183   case X86::BI__builtin_ia32_rndscalepd_mask:
3184   case X86::BI__builtin_ia32_rndscaleps_mask:
3185   case X86::BI__builtin_ia32_rsqrt28sd_round_mask:
3186   case X86::BI__builtin_ia32_rsqrt28ss_round_mask:
3187     ArgNum = 4;
3188     break;
3189   case X86::BI__builtin_ia32_fixupimmpd512_mask:
3190   case X86::BI__builtin_ia32_fixupimmpd512_maskz:
3191   case X86::BI__builtin_ia32_fixupimmps512_mask:
3192   case X86::BI__builtin_ia32_fixupimmps512_maskz:
3193   case X86::BI__builtin_ia32_fixupimmsd_mask:
3194   case X86::BI__builtin_ia32_fixupimmsd_maskz:
3195   case X86::BI__builtin_ia32_fixupimmss_mask:
3196   case X86::BI__builtin_ia32_fixupimmss_maskz:
3197   case X86::BI__builtin_ia32_rangepd512_mask:
3198   case X86::BI__builtin_ia32_rangeps512_mask:
3199   case X86::BI__builtin_ia32_rangesd128_round_mask:
3200   case X86::BI__builtin_ia32_rangess128_round_mask:
3201   case X86::BI__builtin_ia32_reducesd_mask:
3202   case X86::BI__builtin_ia32_reducess_mask:
3203   case X86::BI__builtin_ia32_rndscalesd_round_mask:
3204   case X86::BI__builtin_ia32_rndscaless_round_mask:
3205     ArgNum = 5;
3206     break;
3207   case X86::BI__builtin_ia32_vcvtsd2si64:
3208   case X86::BI__builtin_ia32_vcvtsd2si32:
3209   case X86::BI__builtin_ia32_vcvtsd2usi32:
3210   case X86::BI__builtin_ia32_vcvtsd2usi64:
3211   case X86::BI__builtin_ia32_vcvtss2si32:
3212   case X86::BI__builtin_ia32_vcvtss2si64:
3213   case X86::BI__builtin_ia32_vcvtss2usi32:
3214   case X86::BI__builtin_ia32_vcvtss2usi64:
3215   case X86::BI__builtin_ia32_sqrtpd512:
3216   case X86::BI__builtin_ia32_sqrtps512:
3217     ArgNum = 1;
3218     HasRC = true;
3219     break;
3220   case X86::BI__builtin_ia32_addpd512:
3221   case X86::BI__builtin_ia32_addps512:
3222   case X86::BI__builtin_ia32_divpd512:
3223   case X86::BI__builtin_ia32_divps512:
3224   case X86::BI__builtin_ia32_mulpd512:
3225   case X86::BI__builtin_ia32_mulps512:
3226   case X86::BI__builtin_ia32_subpd512:
3227   case X86::BI__builtin_ia32_subps512:
3228   case X86::BI__builtin_ia32_cvtsi2sd64:
3229   case X86::BI__builtin_ia32_cvtsi2ss32:
3230   case X86::BI__builtin_ia32_cvtsi2ss64:
3231   case X86::BI__builtin_ia32_cvtusi2sd64:
3232   case X86::BI__builtin_ia32_cvtusi2ss32:
3233   case X86::BI__builtin_ia32_cvtusi2ss64:
3234     ArgNum = 2;
3235     HasRC = true;
3236     break;
3237   case X86::BI__builtin_ia32_cvtdq2ps512_mask:
3238   case X86::BI__builtin_ia32_cvtudq2ps512_mask:
3239   case X86::BI__builtin_ia32_cvtpd2ps512_mask:
3240   case X86::BI__builtin_ia32_cvtpd2qq512_mask:
3241   case X86::BI__builtin_ia32_cvtpd2uqq512_mask:
3242   case X86::BI__builtin_ia32_cvtps2qq512_mask:
3243   case X86::BI__builtin_ia32_cvtps2uqq512_mask:
3244   case X86::BI__builtin_ia32_cvtqq2pd512_mask:
3245   case X86::BI__builtin_ia32_cvtqq2ps512_mask:
3246   case X86::BI__builtin_ia32_cvtuqq2pd512_mask:
3247   case X86::BI__builtin_ia32_cvtuqq2ps512_mask:
3248     ArgNum = 3;
3249     HasRC = true;
3250     break;
3251   case X86::BI__builtin_ia32_addss_round_mask:
3252   case X86::BI__builtin_ia32_addsd_round_mask:
3253   case X86::BI__builtin_ia32_divss_round_mask:
3254   case X86::BI__builtin_ia32_divsd_round_mask:
3255   case X86::BI__builtin_ia32_mulss_round_mask:
3256   case X86::BI__builtin_ia32_mulsd_round_mask:
3257   case X86::BI__builtin_ia32_subss_round_mask:
3258   case X86::BI__builtin_ia32_subsd_round_mask:
3259   case X86::BI__builtin_ia32_scalefpd512_mask:
3260   case X86::BI__builtin_ia32_scalefps512_mask:
3261   case X86::BI__builtin_ia32_scalefsd_round_mask:
3262   case X86::BI__builtin_ia32_scalefss_round_mask:
3263   case X86::BI__builtin_ia32_getmantpd512_mask:
3264   case X86::BI__builtin_ia32_getmantps512_mask:
3265   case X86::BI__builtin_ia32_cvtsd2ss_round_mask:
3266   case X86::BI__builtin_ia32_sqrtsd_round_mask:
3267   case X86::BI__builtin_ia32_sqrtss_round_mask:
3268   case X86::BI__builtin_ia32_vfmaddsd3_mask:
3269   case X86::BI__builtin_ia32_vfmaddsd3_maskz:
3270   case X86::BI__builtin_ia32_vfmaddsd3_mask3:
3271   case X86::BI__builtin_ia32_vfmaddss3_mask:
3272   case X86::BI__builtin_ia32_vfmaddss3_maskz:
3273   case X86::BI__builtin_ia32_vfmaddss3_mask3:
3274   case X86::BI__builtin_ia32_vfmaddpd512_mask:
3275   case X86::BI__builtin_ia32_vfmaddpd512_maskz:
3276   case X86::BI__builtin_ia32_vfmaddpd512_mask3:
3277   case X86::BI__builtin_ia32_vfmsubpd512_mask3:
3278   case X86::BI__builtin_ia32_vfmaddps512_mask:
3279   case X86::BI__builtin_ia32_vfmaddps512_maskz:
3280   case X86::BI__builtin_ia32_vfmaddps512_mask3:
3281   case X86::BI__builtin_ia32_vfmsubps512_mask3:
3282   case X86::BI__builtin_ia32_vfmaddsubpd512_mask:
3283   case X86::BI__builtin_ia32_vfmaddsubpd512_maskz:
3284   case X86::BI__builtin_ia32_vfmaddsubpd512_mask3:
3285   case X86::BI__builtin_ia32_vfmsubaddpd512_mask3:
3286   case X86::BI__builtin_ia32_vfmaddsubps512_mask:
3287   case X86::BI__builtin_ia32_vfmaddsubps512_maskz:
3288   case X86::BI__builtin_ia32_vfmaddsubps512_mask3:
3289   case X86::BI__builtin_ia32_vfmsubaddps512_mask3:
3290     ArgNum = 4;
3291     HasRC = true;
3292     break;
3293   case X86::BI__builtin_ia32_getmantsd_round_mask:
3294   case X86::BI__builtin_ia32_getmantss_round_mask:
3295     ArgNum = 5;
3296     HasRC = true;
3297     break;
3298   }
3299 
3300   llvm::APSInt Result;
3301 
3302   // We can't check the value of a dependent argument.
3303   Expr *Arg = TheCall->getArg(ArgNum);
3304   if (Arg->isTypeDependent() || Arg->isValueDependent())
3305     return false;
3306 
3307   // Check constant-ness first.
3308   if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
3309     return true;
3310 
3311   // Make sure rounding mode is either ROUND_CUR_DIRECTION or ROUND_NO_EXC bit
3312   // is set. If the intrinsic has rounding control(bits 1:0), make sure its only
3313   // combined with ROUND_NO_EXC.
3314   if (Result == 4/*ROUND_CUR_DIRECTION*/ ||
3315       Result == 8/*ROUND_NO_EXC*/ ||
3316       (HasRC && Result.getZExtValue() >= 8 && Result.getZExtValue() <= 11))
3317     return false;
3318 
3319   return Diag(TheCall->getBeginLoc(), diag::err_x86_builtin_invalid_rounding)
3320          << Arg->getSourceRange();
3321 }
3322 
3323 // Check if the gather/scatter scale is legal.
3324 bool Sema::CheckX86BuiltinGatherScatterScale(unsigned BuiltinID,
3325                                              CallExpr *TheCall) {
3326   unsigned ArgNum = 0;
3327   switch (BuiltinID) {
3328   default:
3329     return false;
3330   case X86::BI__builtin_ia32_gatherpfdpd:
3331   case X86::BI__builtin_ia32_gatherpfdps:
3332   case X86::BI__builtin_ia32_gatherpfqpd:
3333   case X86::BI__builtin_ia32_gatherpfqps:
3334   case X86::BI__builtin_ia32_scatterpfdpd:
3335   case X86::BI__builtin_ia32_scatterpfdps:
3336   case X86::BI__builtin_ia32_scatterpfqpd:
3337   case X86::BI__builtin_ia32_scatterpfqps:
3338     ArgNum = 3;
3339     break;
3340   case X86::BI__builtin_ia32_gatherd_pd:
3341   case X86::BI__builtin_ia32_gatherd_pd256:
3342   case X86::BI__builtin_ia32_gatherq_pd:
3343   case X86::BI__builtin_ia32_gatherq_pd256:
3344   case X86::BI__builtin_ia32_gatherd_ps:
3345   case X86::BI__builtin_ia32_gatherd_ps256:
3346   case X86::BI__builtin_ia32_gatherq_ps:
3347   case X86::BI__builtin_ia32_gatherq_ps256:
3348   case X86::BI__builtin_ia32_gatherd_q:
3349   case X86::BI__builtin_ia32_gatherd_q256:
3350   case X86::BI__builtin_ia32_gatherq_q:
3351   case X86::BI__builtin_ia32_gatherq_q256:
3352   case X86::BI__builtin_ia32_gatherd_d:
3353   case X86::BI__builtin_ia32_gatherd_d256:
3354   case X86::BI__builtin_ia32_gatherq_d:
3355   case X86::BI__builtin_ia32_gatherq_d256:
3356   case X86::BI__builtin_ia32_gather3div2df:
3357   case X86::BI__builtin_ia32_gather3div2di:
3358   case X86::BI__builtin_ia32_gather3div4df:
3359   case X86::BI__builtin_ia32_gather3div4di:
3360   case X86::BI__builtin_ia32_gather3div4sf:
3361   case X86::BI__builtin_ia32_gather3div4si:
3362   case X86::BI__builtin_ia32_gather3div8sf:
3363   case X86::BI__builtin_ia32_gather3div8si:
3364   case X86::BI__builtin_ia32_gather3siv2df:
3365   case X86::BI__builtin_ia32_gather3siv2di:
3366   case X86::BI__builtin_ia32_gather3siv4df:
3367   case X86::BI__builtin_ia32_gather3siv4di:
3368   case X86::BI__builtin_ia32_gather3siv4sf:
3369   case X86::BI__builtin_ia32_gather3siv4si:
3370   case X86::BI__builtin_ia32_gather3siv8sf:
3371   case X86::BI__builtin_ia32_gather3siv8si:
3372   case X86::BI__builtin_ia32_gathersiv8df:
3373   case X86::BI__builtin_ia32_gathersiv16sf:
3374   case X86::BI__builtin_ia32_gatherdiv8df:
3375   case X86::BI__builtin_ia32_gatherdiv16sf:
3376   case X86::BI__builtin_ia32_gathersiv8di:
3377   case X86::BI__builtin_ia32_gathersiv16si:
3378   case X86::BI__builtin_ia32_gatherdiv8di:
3379   case X86::BI__builtin_ia32_gatherdiv16si:
3380   case X86::BI__builtin_ia32_scatterdiv2df:
3381   case X86::BI__builtin_ia32_scatterdiv2di:
3382   case X86::BI__builtin_ia32_scatterdiv4df:
3383   case X86::BI__builtin_ia32_scatterdiv4di:
3384   case X86::BI__builtin_ia32_scatterdiv4sf:
3385   case X86::BI__builtin_ia32_scatterdiv4si:
3386   case X86::BI__builtin_ia32_scatterdiv8sf:
3387   case X86::BI__builtin_ia32_scatterdiv8si:
3388   case X86::BI__builtin_ia32_scattersiv2df:
3389   case X86::BI__builtin_ia32_scattersiv2di:
3390   case X86::BI__builtin_ia32_scattersiv4df:
3391   case X86::BI__builtin_ia32_scattersiv4di:
3392   case X86::BI__builtin_ia32_scattersiv4sf:
3393   case X86::BI__builtin_ia32_scattersiv4si:
3394   case X86::BI__builtin_ia32_scattersiv8sf:
3395   case X86::BI__builtin_ia32_scattersiv8si:
3396   case X86::BI__builtin_ia32_scattersiv8df:
3397   case X86::BI__builtin_ia32_scattersiv16sf:
3398   case X86::BI__builtin_ia32_scatterdiv8df:
3399   case X86::BI__builtin_ia32_scatterdiv16sf:
3400   case X86::BI__builtin_ia32_scattersiv8di:
3401   case X86::BI__builtin_ia32_scattersiv16si:
3402   case X86::BI__builtin_ia32_scatterdiv8di:
3403   case X86::BI__builtin_ia32_scatterdiv16si:
3404     ArgNum = 4;
3405     break;
3406   }
3407 
3408   llvm::APSInt Result;
3409 
3410   // We can't check the value of a dependent argument.
3411   Expr *Arg = TheCall->getArg(ArgNum);
3412   if (Arg->isTypeDependent() || Arg->isValueDependent())
3413     return false;
3414 
3415   // Check constant-ness first.
3416   if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
3417     return true;
3418 
3419   if (Result == 1 || Result == 2 || Result == 4 || Result == 8)
3420     return false;
3421 
3422   return Diag(TheCall->getBeginLoc(), diag::err_x86_builtin_invalid_scale)
3423          << Arg->getSourceRange();
3424 }
3425 
3426 static bool isX86_32Builtin(unsigned BuiltinID) {
3427   // These builtins only work on x86-32 targets.
3428   switch (BuiltinID) {
3429   case X86::BI__builtin_ia32_readeflags_u32:
3430   case X86::BI__builtin_ia32_writeeflags_u32:
3431     return true;
3432   }
3433 
3434   return false;
3435 }
3436 
3437 bool Sema::CheckX86BuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
3438   if (BuiltinID == X86::BI__builtin_cpu_supports)
3439     return SemaBuiltinCpuSupports(*this, TheCall);
3440 
3441   if (BuiltinID == X86::BI__builtin_cpu_is)
3442     return SemaBuiltinCpuIs(*this, TheCall);
3443 
3444   // Check for 32-bit only builtins on a 64-bit target.
3445   const llvm::Triple &TT = Context.getTargetInfo().getTriple();
3446   if (TT.getArch() != llvm::Triple::x86 && isX86_32Builtin(BuiltinID))
3447     return Diag(TheCall->getCallee()->getBeginLoc(),
3448                 diag::err_32_bit_builtin_64_bit_tgt);
3449 
3450   // If the intrinsic has rounding or SAE make sure its valid.
3451   if (CheckX86BuiltinRoundingOrSAE(BuiltinID, TheCall))
3452     return true;
3453 
3454   // If the intrinsic has a gather/scatter scale immediate make sure its valid.
3455   if (CheckX86BuiltinGatherScatterScale(BuiltinID, TheCall))
3456     return true;
3457 
3458   // For intrinsics which take an immediate value as part of the instruction,
3459   // range check them here.
3460   int i = 0, l = 0, u = 0;
3461   switch (BuiltinID) {
3462   default:
3463     return false;
3464   case X86::BI__builtin_ia32_vec_ext_v2si:
3465   case X86::BI__builtin_ia32_vec_ext_v2di:
3466   case X86::BI__builtin_ia32_vextractf128_pd256:
3467   case X86::BI__builtin_ia32_vextractf128_ps256:
3468   case X86::BI__builtin_ia32_vextractf128_si256:
3469   case X86::BI__builtin_ia32_extract128i256:
3470   case X86::BI__builtin_ia32_extractf64x4_mask:
3471   case X86::BI__builtin_ia32_extracti64x4_mask:
3472   case X86::BI__builtin_ia32_extractf32x8_mask:
3473   case X86::BI__builtin_ia32_extracti32x8_mask:
3474   case X86::BI__builtin_ia32_extractf64x2_256_mask:
3475   case X86::BI__builtin_ia32_extracti64x2_256_mask:
3476   case X86::BI__builtin_ia32_extractf32x4_256_mask:
3477   case X86::BI__builtin_ia32_extracti32x4_256_mask:
3478     i = 1; l = 0; u = 1;
3479     break;
3480   case X86::BI__builtin_ia32_vec_set_v2di:
3481   case X86::BI__builtin_ia32_vinsertf128_pd256:
3482   case X86::BI__builtin_ia32_vinsertf128_ps256:
3483   case X86::BI__builtin_ia32_vinsertf128_si256:
3484   case X86::BI__builtin_ia32_insert128i256:
3485   case X86::BI__builtin_ia32_insertf32x8:
3486   case X86::BI__builtin_ia32_inserti32x8:
3487   case X86::BI__builtin_ia32_insertf64x4:
3488   case X86::BI__builtin_ia32_inserti64x4:
3489   case X86::BI__builtin_ia32_insertf64x2_256:
3490   case X86::BI__builtin_ia32_inserti64x2_256:
3491   case X86::BI__builtin_ia32_insertf32x4_256:
3492   case X86::BI__builtin_ia32_inserti32x4_256:
3493     i = 2; l = 0; u = 1;
3494     break;
3495   case X86::BI__builtin_ia32_vpermilpd:
3496   case X86::BI__builtin_ia32_vec_ext_v4hi:
3497   case X86::BI__builtin_ia32_vec_ext_v4si:
3498   case X86::BI__builtin_ia32_vec_ext_v4sf:
3499   case X86::BI__builtin_ia32_vec_ext_v4di:
3500   case X86::BI__builtin_ia32_extractf32x4_mask:
3501   case X86::BI__builtin_ia32_extracti32x4_mask:
3502   case X86::BI__builtin_ia32_extractf64x2_512_mask:
3503   case X86::BI__builtin_ia32_extracti64x2_512_mask:
3504     i = 1; l = 0; u = 3;
3505     break;
3506   case X86::BI_mm_prefetch:
3507   case X86::BI__builtin_ia32_vec_ext_v8hi:
3508   case X86::BI__builtin_ia32_vec_ext_v8si:
3509     i = 1; l = 0; u = 7;
3510     break;
3511   case X86::BI__builtin_ia32_sha1rnds4:
3512   case X86::BI__builtin_ia32_blendpd:
3513   case X86::BI__builtin_ia32_shufpd:
3514   case X86::BI__builtin_ia32_vec_set_v4hi:
3515   case X86::BI__builtin_ia32_vec_set_v4si:
3516   case X86::BI__builtin_ia32_vec_set_v4di:
3517   case X86::BI__builtin_ia32_shuf_f32x4_256:
3518   case X86::BI__builtin_ia32_shuf_f64x2_256:
3519   case X86::BI__builtin_ia32_shuf_i32x4_256:
3520   case X86::BI__builtin_ia32_shuf_i64x2_256:
3521   case X86::BI__builtin_ia32_insertf64x2_512:
3522   case X86::BI__builtin_ia32_inserti64x2_512:
3523   case X86::BI__builtin_ia32_insertf32x4:
3524   case X86::BI__builtin_ia32_inserti32x4:
3525     i = 2; l = 0; u = 3;
3526     break;
3527   case X86::BI__builtin_ia32_vpermil2pd:
3528   case X86::BI__builtin_ia32_vpermil2pd256:
3529   case X86::BI__builtin_ia32_vpermil2ps:
3530   case X86::BI__builtin_ia32_vpermil2ps256:
3531     i = 3; l = 0; u = 3;
3532     break;
3533   case X86::BI__builtin_ia32_cmpb128_mask:
3534   case X86::BI__builtin_ia32_cmpw128_mask:
3535   case X86::BI__builtin_ia32_cmpd128_mask:
3536   case X86::BI__builtin_ia32_cmpq128_mask:
3537   case X86::BI__builtin_ia32_cmpb256_mask:
3538   case X86::BI__builtin_ia32_cmpw256_mask:
3539   case X86::BI__builtin_ia32_cmpd256_mask:
3540   case X86::BI__builtin_ia32_cmpq256_mask:
3541   case X86::BI__builtin_ia32_cmpb512_mask:
3542   case X86::BI__builtin_ia32_cmpw512_mask:
3543   case X86::BI__builtin_ia32_cmpd512_mask:
3544   case X86::BI__builtin_ia32_cmpq512_mask:
3545   case X86::BI__builtin_ia32_ucmpb128_mask:
3546   case X86::BI__builtin_ia32_ucmpw128_mask:
3547   case X86::BI__builtin_ia32_ucmpd128_mask:
3548   case X86::BI__builtin_ia32_ucmpq128_mask:
3549   case X86::BI__builtin_ia32_ucmpb256_mask:
3550   case X86::BI__builtin_ia32_ucmpw256_mask:
3551   case X86::BI__builtin_ia32_ucmpd256_mask:
3552   case X86::BI__builtin_ia32_ucmpq256_mask:
3553   case X86::BI__builtin_ia32_ucmpb512_mask:
3554   case X86::BI__builtin_ia32_ucmpw512_mask:
3555   case X86::BI__builtin_ia32_ucmpd512_mask:
3556   case X86::BI__builtin_ia32_ucmpq512_mask:
3557   case X86::BI__builtin_ia32_vpcomub:
3558   case X86::BI__builtin_ia32_vpcomuw:
3559   case X86::BI__builtin_ia32_vpcomud:
3560   case X86::BI__builtin_ia32_vpcomuq:
3561   case X86::BI__builtin_ia32_vpcomb:
3562   case X86::BI__builtin_ia32_vpcomw:
3563   case X86::BI__builtin_ia32_vpcomd:
3564   case X86::BI__builtin_ia32_vpcomq:
3565   case X86::BI__builtin_ia32_vec_set_v8hi:
3566   case X86::BI__builtin_ia32_vec_set_v8si:
3567     i = 2; l = 0; u = 7;
3568     break;
3569   case X86::BI__builtin_ia32_vpermilpd256:
3570   case X86::BI__builtin_ia32_roundps:
3571   case X86::BI__builtin_ia32_roundpd:
3572   case X86::BI__builtin_ia32_roundps256:
3573   case X86::BI__builtin_ia32_roundpd256:
3574   case X86::BI__builtin_ia32_getmantpd128_mask:
3575   case X86::BI__builtin_ia32_getmantpd256_mask:
3576   case X86::BI__builtin_ia32_getmantps128_mask:
3577   case X86::BI__builtin_ia32_getmantps256_mask:
3578   case X86::BI__builtin_ia32_getmantpd512_mask:
3579   case X86::BI__builtin_ia32_getmantps512_mask:
3580   case X86::BI__builtin_ia32_vec_ext_v16qi:
3581   case X86::BI__builtin_ia32_vec_ext_v16hi:
3582     i = 1; l = 0; u = 15;
3583     break;
3584   case X86::BI__builtin_ia32_pblendd128:
3585   case X86::BI__builtin_ia32_blendps:
3586   case X86::BI__builtin_ia32_blendpd256:
3587   case X86::BI__builtin_ia32_shufpd256:
3588   case X86::BI__builtin_ia32_roundss:
3589   case X86::BI__builtin_ia32_roundsd:
3590   case X86::BI__builtin_ia32_rangepd128_mask:
3591   case X86::BI__builtin_ia32_rangepd256_mask:
3592   case X86::BI__builtin_ia32_rangepd512_mask:
3593   case X86::BI__builtin_ia32_rangeps128_mask:
3594   case X86::BI__builtin_ia32_rangeps256_mask:
3595   case X86::BI__builtin_ia32_rangeps512_mask:
3596   case X86::BI__builtin_ia32_getmantsd_round_mask:
3597   case X86::BI__builtin_ia32_getmantss_round_mask:
3598   case X86::BI__builtin_ia32_vec_set_v16qi:
3599   case X86::BI__builtin_ia32_vec_set_v16hi:
3600     i = 2; l = 0; u = 15;
3601     break;
3602   case X86::BI__builtin_ia32_vec_ext_v32qi:
3603     i = 1; l = 0; u = 31;
3604     break;
3605   case X86::BI__builtin_ia32_cmpps:
3606   case X86::BI__builtin_ia32_cmpss:
3607   case X86::BI__builtin_ia32_cmppd:
3608   case X86::BI__builtin_ia32_cmpsd:
3609   case X86::BI__builtin_ia32_cmpps256:
3610   case X86::BI__builtin_ia32_cmppd256:
3611   case X86::BI__builtin_ia32_cmpps128_mask:
3612   case X86::BI__builtin_ia32_cmppd128_mask:
3613   case X86::BI__builtin_ia32_cmpps256_mask:
3614   case X86::BI__builtin_ia32_cmppd256_mask:
3615   case X86::BI__builtin_ia32_cmpps512_mask:
3616   case X86::BI__builtin_ia32_cmppd512_mask:
3617   case X86::BI__builtin_ia32_cmpsd_mask:
3618   case X86::BI__builtin_ia32_cmpss_mask:
3619   case X86::BI__builtin_ia32_vec_set_v32qi:
3620     i = 2; l = 0; u = 31;
3621     break;
3622   case X86::BI__builtin_ia32_permdf256:
3623   case X86::BI__builtin_ia32_permdi256:
3624   case X86::BI__builtin_ia32_permdf512:
3625   case X86::BI__builtin_ia32_permdi512:
3626   case X86::BI__builtin_ia32_vpermilps:
3627   case X86::BI__builtin_ia32_vpermilps256:
3628   case X86::BI__builtin_ia32_vpermilpd512:
3629   case X86::BI__builtin_ia32_vpermilps512:
3630   case X86::BI__builtin_ia32_pshufd:
3631   case X86::BI__builtin_ia32_pshufd256:
3632   case X86::BI__builtin_ia32_pshufd512:
3633   case X86::BI__builtin_ia32_pshufhw:
3634   case X86::BI__builtin_ia32_pshufhw256:
3635   case X86::BI__builtin_ia32_pshufhw512:
3636   case X86::BI__builtin_ia32_pshuflw:
3637   case X86::BI__builtin_ia32_pshuflw256:
3638   case X86::BI__builtin_ia32_pshuflw512:
3639   case X86::BI__builtin_ia32_vcvtps2ph:
3640   case X86::BI__builtin_ia32_vcvtps2ph_mask:
3641   case X86::BI__builtin_ia32_vcvtps2ph256:
3642   case X86::BI__builtin_ia32_vcvtps2ph256_mask:
3643   case X86::BI__builtin_ia32_vcvtps2ph512_mask:
3644   case X86::BI__builtin_ia32_rndscaleps_128_mask:
3645   case X86::BI__builtin_ia32_rndscalepd_128_mask:
3646   case X86::BI__builtin_ia32_rndscaleps_256_mask:
3647   case X86::BI__builtin_ia32_rndscalepd_256_mask:
3648   case X86::BI__builtin_ia32_rndscaleps_mask:
3649   case X86::BI__builtin_ia32_rndscalepd_mask:
3650   case X86::BI__builtin_ia32_reducepd128_mask:
3651   case X86::BI__builtin_ia32_reducepd256_mask:
3652   case X86::BI__builtin_ia32_reducepd512_mask:
3653   case X86::BI__builtin_ia32_reduceps128_mask:
3654   case X86::BI__builtin_ia32_reduceps256_mask:
3655   case X86::BI__builtin_ia32_reduceps512_mask:
3656   case X86::BI__builtin_ia32_prold512:
3657   case X86::BI__builtin_ia32_prolq512:
3658   case X86::BI__builtin_ia32_prold128:
3659   case X86::BI__builtin_ia32_prold256:
3660   case X86::BI__builtin_ia32_prolq128:
3661   case X86::BI__builtin_ia32_prolq256:
3662   case X86::BI__builtin_ia32_prord512:
3663   case X86::BI__builtin_ia32_prorq512:
3664   case X86::BI__builtin_ia32_prord128:
3665   case X86::BI__builtin_ia32_prord256:
3666   case X86::BI__builtin_ia32_prorq128:
3667   case X86::BI__builtin_ia32_prorq256:
3668   case X86::BI__builtin_ia32_fpclasspd128_mask:
3669   case X86::BI__builtin_ia32_fpclasspd256_mask:
3670   case X86::BI__builtin_ia32_fpclassps128_mask:
3671   case X86::BI__builtin_ia32_fpclassps256_mask:
3672   case X86::BI__builtin_ia32_fpclassps512_mask:
3673   case X86::BI__builtin_ia32_fpclasspd512_mask:
3674   case X86::BI__builtin_ia32_fpclasssd_mask:
3675   case X86::BI__builtin_ia32_fpclassss_mask:
3676   case X86::BI__builtin_ia32_pslldqi128_byteshift:
3677   case X86::BI__builtin_ia32_pslldqi256_byteshift:
3678   case X86::BI__builtin_ia32_pslldqi512_byteshift:
3679   case X86::BI__builtin_ia32_psrldqi128_byteshift:
3680   case X86::BI__builtin_ia32_psrldqi256_byteshift:
3681   case X86::BI__builtin_ia32_psrldqi512_byteshift:
3682   case X86::BI__builtin_ia32_kshiftliqi:
3683   case X86::BI__builtin_ia32_kshiftlihi:
3684   case X86::BI__builtin_ia32_kshiftlisi:
3685   case X86::BI__builtin_ia32_kshiftlidi:
3686   case X86::BI__builtin_ia32_kshiftriqi:
3687   case X86::BI__builtin_ia32_kshiftrihi:
3688   case X86::BI__builtin_ia32_kshiftrisi:
3689   case X86::BI__builtin_ia32_kshiftridi:
3690     i = 1; l = 0; u = 255;
3691     break;
3692   case X86::BI__builtin_ia32_vperm2f128_pd256:
3693   case X86::BI__builtin_ia32_vperm2f128_ps256:
3694   case X86::BI__builtin_ia32_vperm2f128_si256:
3695   case X86::BI__builtin_ia32_permti256:
3696   case X86::BI__builtin_ia32_pblendw128:
3697   case X86::BI__builtin_ia32_pblendw256:
3698   case X86::BI__builtin_ia32_blendps256:
3699   case X86::BI__builtin_ia32_pblendd256:
3700   case X86::BI__builtin_ia32_palignr128:
3701   case X86::BI__builtin_ia32_palignr256:
3702   case X86::BI__builtin_ia32_palignr512:
3703   case X86::BI__builtin_ia32_alignq512:
3704   case X86::BI__builtin_ia32_alignd512:
3705   case X86::BI__builtin_ia32_alignd128:
3706   case X86::BI__builtin_ia32_alignd256:
3707   case X86::BI__builtin_ia32_alignq128:
3708   case X86::BI__builtin_ia32_alignq256:
3709   case X86::BI__builtin_ia32_vcomisd:
3710   case X86::BI__builtin_ia32_vcomiss:
3711   case X86::BI__builtin_ia32_shuf_f32x4:
3712   case X86::BI__builtin_ia32_shuf_f64x2:
3713   case X86::BI__builtin_ia32_shuf_i32x4:
3714   case X86::BI__builtin_ia32_shuf_i64x2:
3715   case X86::BI__builtin_ia32_shufpd512:
3716   case X86::BI__builtin_ia32_shufps:
3717   case X86::BI__builtin_ia32_shufps256:
3718   case X86::BI__builtin_ia32_shufps512:
3719   case X86::BI__builtin_ia32_dbpsadbw128:
3720   case X86::BI__builtin_ia32_dbpsadbw256:
3721   case X86::BI__builtin_ia32_dbpsadbw512:
3722   case X86::BI__builtin_ia32_vpshldd128:
3723   case X86::BI__builtin_ia32_vpshldd256:
3724   case X86::BI__builtin_ia32_vpshldd512:
3725   case X86::BI__builtin_ia32_vpshldq128:
3726   case X86::BI__builtin_ia32_vpshldq256:
3727   case X86::BI__builtin_ia32_vpshldq512:
3728   case X86::BI__builtin_ia32_vpshldw128:
3729   case X86::BI__builtin_ia32_vpshldw256:
3730   case X86::BI__builtin_ia32_vpshldw512:
3731   case X86::BI__builtin_ia32_vpshrdd128:
3732   case X86::BI__builtin_ia32_vpshrdd256:
3733   case X86::BI__builtin_ia32_vpshrdd512:
3734   case X86::BI__builtin_ia32_vpshrdq128:
3735   case X86::BI__builtin_ia32_vpshrdq256:
3736   case X86::BI__builtin_ia32_vpshrdq512:
3737   case X86::BI__builtin_ia32_vpshrdw128:
3738   case X86::BI__builtin_ia32_vpshrdw256:
3739   case X86::BI__builtin_ia32_vpshrdw512:
3740     i = 2; l = 0; u = 255;
3741     break;
3742   case X86::BI__builtin_ia32_fixupimmpd512_mask:
3743   case X86::BI__builtin_ia32_fixupimmpd512_maskz:
3744   case X86::BI__builtin_ia32_fixupimmps512_mask:
3745   case X86::BI__builtin_ia32_fixupimmps512_maskz:
3746   case X86::BI__builtin_ia32_fixupimmsd_mask:
3747   case X86::BI__builtin_ia32_fixupimmsd_maskz:
3748   case X86::BI__builtin_ia32_fixupimmss_mask:
3749   case X86::BI__builtin_ia32_fixupimmss_maskz:
3750   case X86::BI__builtin_ia32_fixupimmpd128_mask:
3751   case X86::BI__builtin_ia32_fixupimmpd128_maskz:
3752   case X86::BI__builtin_ia32_fixupimmpd256_mask:
3753   case X86::BI__builtin_ia32_fixupimmpd256_maskz:
3754   case X86::BI__builtin_ia32_fixupimmps128_mask:
3755   case X86::BI__builtin_ia32_fixupimmps128_maskz:
3756   case X86::BI__builtin_ia32_fixupimmps256_mask:
3757   case X86::BI__builtin_ia32_fixupimmps256_maskz:
3758   case X86::BI__builtin_ia32_pternlogd512_mask:
3759   case X86::BI__builtin_ia32_pternlogd512_maskz:
3760   case X86::BI__builtin_ia32_pternlogq512_mask:
3761   case X86::BI__builtin_ia32_pternlogq512_maskz:
3762   case X86::BI__builtin_ia32_pternlogd128_mask:
3763   case X86::BI__builtin_ia32_pternlogd128_maskz:
3764   case X86::BI__builtin_ia32_pternlogd256_mask:
3765   case X86::BI__builtin_ia32_pternlogd256_maskz:
3766   case X86::BI__builtin_ia32_pternlogq128_mask:
3767   case X86::BI__builtin_ia32_pternlogq128_maskz:
3768   case X86::BI__builtin_ia32_pternlogq256_mask:
3769   case X86::BI__builtin_ia32_pternlogq256_maskz:
3770     i = 3; l = 0; u = 255;
3771     break;
3772   case X86::BI__builtin_ia32_gatherpfdpd:
3773   case X86::BI__builtin_ia32_gatherpfdps:
3774   case X86::BI__builtin_ia32_gatherpfqpd:
3775   case X86::BI__builtin_ia32_gatherpfqps:
3776   case X86::BI__builtin_ia32_scatterpfdpd:
3777   case X86::BI__builtin_ia32_scatterpfdps:
3778   case X86::BI__builtin_ia32_scatterpfqpd:
3779   case X86::BI__builtin_ia32_scatterpfqps:
3780     i = 4; l = 2; u = 3;
3781     break;
3782   case X86::BI__builtin_ia32_rndscalesd_round_mask:
3783   case X86::BI__builtin_ia32_rndscaless_round_mask:
3784     i = 4; l = 0; u = 255;
3785     break;
3786   }
3787 
3788   // Note that we don't force a hard error on the range check here, allowing
3789   // template-generated or macro-generated dead code to potentially have out-of-
3790   // range values. These need to code generate, but don't need to necessarily
3791   // make any sense. We use a warning that defaults to an error.
3792   return SemaBuiltinConstantArgRange(TheCall, i, l, u, /*RangeIsError*/ false);
3793 }
3794 
3795 /// Given a FunctionDecl's FormatAttr, attempts to populate the FomatStringInfo
3796 /// parameter with the FormatAttr's correct format_idx and firstDataArg.
3797 /// Returns true when the format fits the function and the FormatStringInfo has
3798 /// been populated.
3799 bool Sema::getFormatStringInfo(const FormatAttr *Format, bool IsCXXMember,
3800                                FormatStringInfo *FSI) {
3801   FSI->HasVAListArg = Format->getFirstArg() == 0;
3802   FSI->FormatIdx = Format->getFormatIdx() - 1;
3803   FSI->FirstDataArg = FSI->HasVAListArg ? 0 : Format->getFirstArg() - 1;
3804 
3805   // The way the format attribute works in GCC, the implicit this argument
3806   // of member functions is counted. However, it doesn't appear in our own
3807   // lists, so decrement format_idx in that case.
3808   if (IsCXXMember) {
3809     if(FSI->FormatIdx == 0)
3810       return false;
3811     --FSI->FormatIdx;
3812     if (FSI->FirstDataArg != 0)
3813       --FSI->FirstDataArg;
3814   }
3815   return true;
3816 }
3817 
3818 /// Checks if a the given expression evaluates to null.
3819 ///
3820 /// Returns true if the value evaluates to null.
3821 static bool CheckNonNullExpr(Sema &S, const Expr *Expr) {
3822   // If the expression has non-null type, it doesn't evaluate to null.
3823   if (auto nullability
3824         = Expr->IgnoreImplicit()->getType()->getNullability(S.Context)) {
3825     if (*nullability == NullabilityKind::NonNull)
3826       return false;
3827   }
3828 
3829   // As a special case, transparent unions initialized with zero are
3830   // considered null for the purposes of the nonnull attribute.
3831   if (const RecordType *UT = Expr->getType()->getAsUnionType()) {
3832     if (UT->getDecl()->hasAttr<TransparentUnionAttr>())
3833       if (const CompoundLiteralExpr *CLE =
3834           dyn_cast<CompoundLiteralExpr>(Expr))
3835         if (const InitListExpr *ILE =
3836             dyn_cast<InitListExpr>(CLE->getInitializer()))
3837           Expr = ILE->getInit(0);
3838   }
3839 
3840   bool Result;
3841   return (!Expr->isValueDependent() &&
3842           Expr->EvaluateAsBooleanCondition(Result, S.Context) &&
3843           !Result);
3844 }
3845 
3846 static void CheckNonNullArgument(Sema &S,
3847                                  const Expr *ArgExpr,
3848                                  SourceLocation CallSiteLoc) {
3849   if (CheckNonNullExpr(S, ArgExpr))
3850     S.DiagRuntimeBehavior(CallSiteLoc, ArgExpr,
3851            S.PDiag(diag::warn_null_arg) << ArgExpr->getSourceRange());
3852 }
3853 
3854 bool Sema::GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx) {
3855   FormatStringInfo FSI;
3856   if ((GetFormatStringType(Format) == FST_NSString) &&
3857       getFormatStringInfo(Format, false, &FSI)) {
3858     Idx = FSI.FormatIdx;
3859     return true;
3860   }
3861   return false;
3862 }
3863 
3864 /// Diagnose use of %s directive in an NSString which is being passed
3865 /// as formatting string to formatting method.
3866 static void
3867 DiagnoseCStringFormatDirectiveInCFAPI(Sema &S,
3868                                         const NamedDecl *FDecl,
3869                                         Expr **Args,
3870                                         unsigned NumArgs) {
3871   unsigned Idx = 0;
3872   bool Format = false;
3873   ObjCStringFormatFamily SFFamily = FDecl->getObjCFStringFormattingFamily();
3874   if (SFFamily == ObjCStringFormatFamily::SFF_CFString) {
3875     Idx = 2;
3876     Format = true;
3877   }
3878   else
3879     for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
3880       if (S.GetFormatNSStringIdx(I, Idx)) {
3881         Format = true;
3882         break;
3883       }
3884     }
3885   if (!Format || NumArgs <= Idx)
3886     return;
3887   const Expr *FormatExpr = Args[Idx];
3888   if (const CStyleCastExpr *CSCE = dyn_cast<CStyleCastExpr>(FormatExpr))
3889     FormatExpr = CSCE->getSubExpr();
3890   const StringLiteral *FormatString;
3891   if (const ObjCStringLiteral *OSL =
3892       dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts()))
3893     FormatString = OSL->getString();
3894   else
3895     FormatString = dyn_cast<StringLiteral>(FormatExpr->IgnoreParenImpCasts());
3896   if (!FormatString)
3897     return;
3898   if (S.FormatStringHasSArg(FormatString)) {
3899     S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
3900       << "%s" << 1 << 1;
3901     S.Diag(FDecl->getLocation(), diag::note_entity_declared_at)
3902       << FDecl->getDeclName();
3903   }
3904 }
3905 
3906 /// Determine whether the given type has a non-null nullability annotation.
3907 static bool isNonNullType(ASTContext &ctx, QualType type) {
3908   if (auto nullability = type->getNullability(ctx))
3909     return *nullability == NullabilityKind::NonNull;
3910 
3911   return false;
3912 }
3913 
3914 static void CheckNonNullArguments(Sema &S,
3915                                   const NamedDecl *FDecl,
3916                                   const FunctionProtoType *Proto,
3917                                   ArrayRef<const Expr *> Args,
3918                                   SourceLocation CallSiteLoc) {
3919   assert((FDecl || Proto) && "Need a function declaration or prototype");
3920 
3921   // Check the attributes attached to the method/function itself.
3922   llvm::SmallBitVector NonNullArgs;
3923   if (FDecl) {
3924     // Handle the nonnull attribute on the function/method declaration itself.
3925     for (const auto *NonNull : FDecl->specific_attrs<NonNullAttr>()) {
3926       if (!NonNull->args_size()) {
3927         // Easy case: all pointer arguments are nonnull.
3928         for (const auto *Arg : Args)
3929           if (S.isValidPointerAttrType(Arg->getType()))
3930             CheckNonNullArgument(S, Arg, CallSiteLoc);
3931         return;
3932       }
3933 
3934       for (const ParamIdx &Idx : NonNull->args()) {
3935         unsigned IdxAST = Idx.getASTIndex();
3936         if (IdxAST >= Args.size())
3937           continue;
3938         if (NonNullArgs.empty())
3939           NonNullArgs.resize(Args.size());
3940         NonNullArgs.set(IdxAST);
3941       }
3942     }
3943   }
3944 
3945   if (FDecl && (isa<FunctionDecl>(FDecl) || isa<ObjCMethodDecl>(FDecl))) {
3946     // Handle the nonnull attribute on the parameters of the
3947     // function/method.
3948     ArrayRef<ParmVarDecl*> parms;
3949     if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(FDecl))
3950       parms = FD->parameters();
3951     else
3952       parms = cast<ObjCMethodDecl>(FDecl)->parameters();
3953 
3954     unsigned ParamIndex = 0;
3955     for (ArrayRef<ParmVarDecl*>::iterator I = parms.begin(), E = parms.end();
3956          I != E; ++I, ++ParamIndex) {
3957       const ParmVarDecl *PVD = *I;
3958       if (PVD->hasAttr<NonNullAttr>() ||
3959           isNonNullType(S.Context, PVD->getType())) {
3960         if (NonNullArgs.empty())
3961           NonNullArgs.resize(Args.size());
3962 
3963         NonNullArgs.set(ParamIndex);
3964       }
3965     }
3966   } else {
3967     // If we have a non-function, non-method declaration but no
3968     // function prototype, try to dig out the function prototype.
3969     if (!Proto) {
3970       if (const ValueDecl *VD = dyn_cast<ValueDecl>(FDecl)) {
3971         QualType type = VD->getType().getNonReferenceType();
3972         if (auto pointerType = type->getAs<PointerType>())
3973           type = pointerType->getPointeeType();
3974         else if (auto blockType = type->getAs<BlockPointerType>())
3975           type = blockType->getPointeeType();
3976         // FIXME: data member pointers?
3977 
3978         // Dig out the function prototype, if there is one.
3979         Proto = type->getAs<FunctionProtoType>();
3980       }
3981     }
3982 
3983     // Fill in non-null argument information from the nullability
3984     // information on the parameter types (if we have them).
3985     if (Proto) {
3986       unsigned Index = 0;
3987       for (auto paramType : Proto->getParamTypes()) {
3988         if (isNonNullType(S.Context, paramType)) {
3989           if (NonNullArgs.empty())
3990             NonNullArgs.resize(Args.size());
3991 
3992           NonNullArgs.set(Index);
3993         }
3994 
3995         ++Index;
3996       }
3997     }
3998   }
3999 
4000   // Check for non-null arguments.
4001   for (unsigned ArgIndex = 0, ArgIndexEnd = NonNullArgs.size();
4002        ArgIndex != ArgIndexEnd; ++ArgIndex) {
4003     if (NonNullArgs[ArgIndex])
4004       CheckNonNullArgument(S, Args[ArgIndex], CallSiteLoc);
4005   }
4006 }
4007 
4008 /// Handles the checks for format strings, non-POD arguments to vararg
4009 /// functions, NULL arguments passed to non-NULL parameters, and diagnose_if
4010 /// attributes.
4011 void Sema::checkCall(NamedDecl *FDecl, const FunctionProtoType *Proto,
4012                      const Expr *ThisArg, ArrayRef<const Expr *> Args,
4013                      bool IsMemberFunction, SourceLocation Loc,
4014                      SourceRange Range, VariadicCallType CallType) {
4015   // FIXME: We should check as much as we can in the template definition.
4016   if (CurContext->isDependentContext())
4017     return;
4018 
4019   // Printf and scanf checking.
4020   llvm::SmallBitVector CheckedVarArgs;
4021   if (FDecl) {
4022     for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
4023       // Only create vector if there are format attributes.
4024       CheckedVarArgs.resize(Args.size());
4025 
4026       CheckFormatArguments(I, Args, IsMemberFunction, CallType, Loc, Range,
4027                            CheckedVarArgs);
4028     }
4029   }
4030 
4031   // Refuse POD arguments that weren't caught by the format string
4032   // checks above.
4033   auto *FD = dyn_cast_or_null<FunctionDecl>(FDecl);
4034   if (CallType != VariadicDoesNotApply &&
4035       (!FD || FD->getBuiltinID() != Builtin::BI__noop)) {
4036     unsigned NumParams = Proto ? Proto->getNumParams()
4037                        : FDecl && isa<FunctionDecl>(FDecl)
4038                            ? cast<FunctionDecl>(FDecl)->getNumParams()
4039                        : FDecl && isa<ObjCMethodDecl>(FDecl)
4040                            ? cast<ObjCMethodDecl>(FDecl)->param_size()
4041                        : 0;
4042 
4043     for (unsigned ArgIdx = NumParams; ArgIdx < Args.size(); ++ArgIdx) {
4044       // Args[ArgIdx] can be null in malformed code.
4045       if (const Expr *Arg = Args[ArgIdx]) {
4046         if (CheckedVarArgs.empty() || !CheckedVarArgs[ArgIdx])
4047           checkVariadicArgument(Arg, CallType);
4048       }
4049     }
4050   }
4051 
4052   if (FDecl || Proto) {
4053     CheckNonNullArguments(*this, FDecl, Proto, Args, Loc);
4054 
4055     // Type safety checking.
4056     if (FDecl) {
4057       for (const auto *I : FDecl->specific_attrs<ArgumentWithTypeTagAttr>())
4058         CheckArgumentWithTypeTag(I, Args, Loc);
4059     }
4060   }
4061 
4062   if (FD)
4063     diagnoseArgDependentDiagnoseIfAttrs(FD, ThisArg, Args, Loc);
4064 }
4065 
4066 /// CheckConstructorCall - Check a constructor call for correctness and safety
4067 /// properties not enforced by the C type system.
4068 void Sema::CheckConstructorCall(FunctionDecl *FDecl,
4069                                 ArrayRef<const Expr *> Args,
4070                                 const FunctionProtoType *Proto,
4071                                 SourceLocation Loc) {
4072   VariadicCallType CallType =
4073     Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
4074   checkCall(FDecl, Proto, /*ThisArg=*/nullptr, Args, /*IsMemberFunction=*/true,
4075             Loc, SourceRange(), CallType);
4076 }
4077 
4078 /// CheckFunctionCall - Check a direct function call for various correctness
4079 /// and safety properties not strictly enforced by the C type system.
4080 bool Sema::CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall,
4081                              const FunctionProtoType *Proto) {
4082   bool IsMemberOperatorCall = isa<CXXOperatorCallExpr>(TheCall) &&
4083                               isa<CXXMethodDecl>(FDecl);
4084   bool IsMemberFunction = isa<CXXMemberCallExpr>(TheCall) ||
4085                           IsMemberOperatorCall;
4086   VariadicCallType CallType = getVariadicCallType(FDecl, Proto,
4087                                                   TheCall->getCallee());
4088   Expr** Args = TheCall->getArgs();
4089   unsigned NumArgs = TheCall->getNumArgs();
4090 
4091   Expr *ImplicitThis = nullptr;
4092   if (IsMemberOperatorCall) {
4093     // If this is a call to a member operator, hide the first argument
4094     // from checkCall.
4095     // FIXME: Our choice of AST representation here is less than ideal.
4096     ImplicitThis = Args[0];
4097     ++Args;
4098     --NumArgs;
4099   } else if (IsMemberFunction)
4100     ImplicitThis =
4101         cast<CXXMemberCallExpr>(TheCall)->getImplicitObjectArgument();
4102 
4103   checkCall(FDecl, Proto, ImplicitThis, llvm::makeArrayRef(Args, NumArgs),
4104             IsMemberFunction, TheCall->getRParenLoc(),
4105             TheCall->getCallee()->getSourceRange(), CallType);
4106 
4107   IdentifierInfo *FnInfo = FDecl->getIdentifier();
4108   // None of the checks below are needed for functions that don't have
4109   // simple names (e.g., C++ conversion functions).
4110   if (!FnInfo)
4111     return false;
4112 
4113   CheckAbsoluteValueFunction(TheCall, FDecl);
4114   CheckMaxUnsignedZero(TheCall, FDecl);
4115 
4116   if (getLangOpts().ObjC1)
4117     DiagnoseCStringFormatDirectiveInCFAPI(*this, FDecl, Args, NumArgs);
4118 
4119   unsigned CMId = FDecl->getMemoryFunctionKind();
4120   if (CMId == 0)
4121     return false;
4122 
4123   // Handle memory setting and copying functions.
4124   if (CMId == Builtin::BIstrlcpy || CMId == Builtin::BIstrlcat)
4125     CheckStrlcpycatArguments(TheCall, FnInfo);
4126   else if (CMId == Builtin::BIstrncat)
4127     CheckStrncatArguments(TheCall, FnInfo);
4128   else
4129     CheckMemaccessArguments(TheCall, CMId, FnInfo);
4130 
4131   return false;
4132 }
4133 
4134 bool Sema::CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation lbrac,
4135                                ArrayRef<const Expr *> Args) {
4136   VariadicCallType CallType =
4137       Method->isVariadic() ? VariadicMethod : VariadicDoesNotApply;
4138 
4139   checkCall(Method, nullptr, /*ThisArg=*/nullptr, Args,
4140             /*IsMemberFunction=*/false, lbrac, Method->getSourceRange(),
4141             CallType);
4142 
4143   return false;
4144 }
4145 
4146 bool Sema::CheckPointerCall(NamedDecl *NDecl, CallExpr *TheCall,
4147                             const FunctionProtoType *Proto) {
4148   QualType Ty;
4149   if (const auto *V = dyn_cast<VarDecl>(NDecl))
4150     Ty = V->getType().getNonReferenceType();
4151   else if (const auto *F = dyn_cast<FieldDecl>(NDecl))
4152     Ty = F->getType().getNonReferenceType();
4153   else
4154     return false;
4155 
4156   if (!Ty->isBlockPointerType() && !Ty->isFunctionPointerType() &&
4157       !Ty->isFunctionProtoType())
4158     return false;
4159 
4160   VariadicCallType CallType;
4161   if (!Proto || !Proto->isVariadic()) {
4162     CallType = VariadicDoesNotApply;
4163   } else if (Ty->isBlockPointerType()) {
4164     CallType = VariadicBlock;
4165   } else { // Ty->isFunctionPointerType()
4166     CallType = VariadicFunction;
4167   }
4168 
4169   checkCall(NDecl, Proto, /*ThisArg=*/nullptr,
4170             llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
4171             /*IsMemberFunction=*/false, TheCall->getRParenLoc(),
4172             TheCall->getCallee()->getSourceRange(), CallType);
4173 
4174   return false;
4175 }
4176 
4177 /// Checks function calls when a FunctionDecl or a NamedDecl is not available,
4178 /// such as function pointers returned from functions.
4179 bool Sema::CheckOtherCall(CallExpr *TheCall, const FunctionProtoType *Proto) {
4180   VariadicCallType CallType = getVariadicCallType(/*FDecl=*/nullptr, Proto,
4181                                                   TheCall->getCallee());
4182   checkCall(/*FDecl=*/nullptr, Proto, /*ThisArg=*/nullptr,
4183             llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
4184             /*IsMemberFunction=*/false, TheCall->getRParenLoc(),
4185             TheCall->getCallee()->getSourceRange(), CallType);
4186 
4187   return false;
4188 }
4189 
4190 static bool isValidOrderingForOp(int64_t Ordering, AtomicExpr::AtomicOp Op) {
4191   if (!llvm::isValidAtomicOrderingCABI(Ordering))
4192     return false;
4193 
4194   auto OrderingCABI = (llvm::AtomicOrderingCABI)Ordering;
4195   switch (Op) {
4196   case AtomicExpr::AO__c11_atomic_init:
4197   case AtomicExpr::AO__opencl_atomic_init:
4198     llvm_unreachable("There is no ordering argument for an init");
4199 
4200   case AtomicExpr::AO__c11_atomic_load:
4201   case AtomicExpr::AO__opencl_atomic_load:
4202   case AtomicExpr::AO__atomic_load_n:
4203   case AtomicExpr::AO__atomic_load:
4204     return OrderingCABI != llvm::AtomicOrderingCABI::release &&
4205            OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
4206 
4207   case AtomicExpr::AO__c11_atomic_store:
4208   case AtomicExpr::AO__opencl_atomic_store:
4209   case AtomicExpr::AO__atomic_store:
4210   case AtomicExpr::AO__atomic_store_n:
4211     return OrderingCABI != llvm::AtomicOrderingCABI::consume &&
4212            OrderingCABI != llvm::AtomicOrderingCABI::acquire &&
4213            OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
4214 
4215   default:
4216     return true;
4217   }
4218 }
4219 
4220 ExprResult Sema::SemaAtomicOpsOverloaded(ExprResult TheCallResult,
4221                                          AtomicExpr::AtomicOp Op) {
4222   CallExpr *TheCall = cast<CallExpr>(TheCallResult.get());
4223   DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
4224 
4225   // All the non-OpenCL operations take one of the following forms.
4226   // The OpenCL operations take the __c11 forms with one extra argument for
4227   // synchronization scope.
4228   enum {
4229     // C    __c11_atomic_init(A *, C)
4230     Init,
4231 
4232     // C    __c11_atomic_load(A *, int)
4233     Load,
4234 
4235     // void __atomic_load(A *, CP, int)
4236     LoadCopy,
4237 
4238     // void __atomic_store(A *, CP, int)
4239     Copy,
4240 
4241     // C    __c11_atomic_add(A *, M, int)
4242     Arithmetic,
4243 
4244     // C    __atomic_exchange_n(A *, CP, int)
4245     Xchg,
4246 
4247     // void __atomic_exchange(A *, C *, CP, int)
4248     GNUXchg,
4249 
4250     // bool __c11_atomic_compare_exchange_strong(A *, C *, CP, int, int)
4251     C11CmpXchg,
4252 
4253     // bool __atomic_compare_exchange(A *, C *, CP, bool, int, int)
4254     GNUCmpXchg
4255   } Form = Init;
4256 
4257   const unsigned NumForm = GNUCmpXchg + 1;
4258   const unsigned NumArgs[] = { 2, 2, 3, 3, 3, 3, 4, 5, 6 };
4259   const unsigned NumVals[] = { 1, 0, 1, 1, 1, 1, 2, 2, 3 };
4260   // where:
4261   //   C is an appropriate type,
4262   //   A is volatile _Atomic(C) for __c11 builtins and is C for GNU builtins,
4263   //   CP is C for __c11 builtins and GNU _n builtins and is C * otherwise,
4264   //   M is C if C is an integer, and ptrdiff_t if C is a pointer, and
4265   //   the int parameters are for orderings.
4266 
4267   static_assert(sizeof(NumArgs)/sizeof(NumArgs[0]) == NumForm
4268       && sizeof(NumVals)/sizeof(NumVals[0]) == NumForm,
4269       "need to update code for modified forms");
4270   static_assert(AtomicExpr::AO__c11_atomic_init == 0 &&
4271                     AtomicExpr::AO__c11_atomic_fetch_xor + 1 ==
4272                         AtomicExpr::AO__atomic_load,
4273                 "need to update code for modified C11 atomics");
4274   bool IsOpenCL = Op >= AtomicExpr::AO__opencl_atomic_init &&
4275                   Op <= AtomicExpr::AO__opencl_atomic_fetch_max;
4276   bool IsC11 = (Op >= AtomicExpr::AO__c11_atomic_init &&
4277                Op <= AtomicExpr::AO__c11_atomic_fetch_xor) ||
4278                IsOpenCL;
4279   bool IsN = Op == AtomicExpr::AO__atomic_load_n ||
4280              Op == AtomicExpr::AO__atomic_store_n ||
4281              Op == AtomicExpr::AO__atomic_exchange_n ||
4282              Op == AtomicExpr::AO__atomic_compare_exchange_n;
4283   bool IsAddSub = false;
4284   bool IsMinMax = false;
4285 
4286   switch (Op) {
4287   case AtomicExpr::AO__c11_atomic_init:
4288   case AtomicExpr::AO__opencl_atomic_init:
4289     Form = Init;
4290     break;
4291 
4292   case AtomicExpr::AO__c11_atomic_load:
4293   case AtomicExpr::AO__opencl_atomic_load:
4294   case AtomicExpr::AO__atomic_load_n:
4295     Form = Load;
4296     break;
4297 
4298   case AtomicExpr::AO__atomic_load:
4299     Form = LoadCopy;
4300     break;
4301 
4302   case AtomicExpr::AO__c11_atomic_store:
4303   case AtomicExpr::AO__opencl_atomic_store:
4304   case AtomicExpr::AO__atomic_store:
4305   case AtomicExpr::AO__atomic_store_n:
4306     Form = Copy;
4307     break;
4308 
4309   case AtomicExpr::AO__c11_atomic_fetch_add:
4310   case AtomicExpr::AO__c11_atomic_fetch_sub:
4311   case AtomicExpr::AO__opencl_atomic_fetch_add:
4312   case AtomicExpr::AO__opencl_atomic_fetch_sub:
4313   case AtomicExpr::AO__opencl_atomic_fetch_min:
4314   case AtomicExpr::AO__opencl_atomic_fetch_max:
4315   case AtomicExpr::AO__atomic_fetch_add:
4316   case AtomicExpr::AO__atomic_fetch_sub:
4317   case AtomicExpr::AO__atomic_add_fetch:
4318   case AtomicExpr::AO__atomic_sub_fetch:
4319     IsAddSub = true;
4320     LLVM_FALLTHROUGH;
4321   case AtomicExpr::AO__c11_atomic_fetch_and:
4322   case AtomicExpr::AO__c11_atomic_fetch_or:
4323   case AtomicExpr::AO__c11_atomic_fetch_xor:
4324   case AtomicExpr::AO__opencl_atomic_fetch_and:
4325   case AtomicExpr::AO__opencl_atomic_fetch_or:
4326   case AtomicExpr::AO__opencl_atomic_fetch_xor:
4327   case AtomicExpr::AO__atomic_fetch_and:
4328   case AtomicExpr::AO__atomic_fetch_or:
4329   case AtomicExpr::AO__atomic_fetch_xor:
4330   case AtomicExpr::AO__atomic_fetch_nand:
4331   case AtomicExpr::AO__atomic_and_fetch:
4332   case AtomicExpr::AO__atomic_or_fetch:
4333   case AtomicExpr::AO__atomic_xor_fetch:
4334   case AtomicExpr::AO__atomic_nand_fetch:
4335     Form = Arithmetic;
4336     break;
4337 
4338   case AtomicExpr::AO__atomic_fetch_min:
4339   case AtomicExpr::AO__atomic_fetch_max:
4340     IsMinMax = true;
4341     Form = Arithmetic;
4342     break;
4343 
4344   case AtomicExpr::AO__c11_atomic_exchange:
4345   case AtomicExpr::AO__opencl_atomic_exchange:
4346   case AtomicExpr::AO__atomic_exchange_n:
4347     Form = Xchg;
4348     break;
4349 
4350   case AtomicExpr::AO__atomic_exchange:
4351     Form = GNUXchg;
4352     break;
4353 
4354   case AtomicExpr::AO__c11_atomic_compare_exchange_strong:
4355   case AtomicExpr::AO__c11_atomic_compare_exchange_weak:
4356   case AtomicExpr::AO__opencl_atomic_compare_exchange_strong:
4357   case AtomicExpr::AO__opencl_atomic_compare_exchange_weak:
4358     Form = C11CmpXchg;
4359     break;
4360 
4361   case AtomicExpr::AO__atomic_compare_exchange:
4362   case AtomicExpr::AO__atomic_compare_exchange_n:
4363     Form = GNUCmpXchg;
4364     break;
4365   }
4366 
4367   unsigned AdjustedNumArgs = NumArgs[Form];
4368   if (IsOpenCL && Op != AtomicExpr::AO__opencl_atomic_init)
4369     ++AdjustedNumArgs;
4370   // Check we have the right number of arguments.
4371   if (TheCall->getNumArgs() < AdjustedNumArgs) {
4372     Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args)
4373         << 0 << AdjustedNumArgs << TheCall->getNumArgs()
4374         << TheCall->getCallee()->getSourceRange();
4375     return ExprError();
4376   } else if (TheCall->getNumArgs() > AdjustedNumArgs) {
4377     Diag(TheCall->getArg(AdjustedNumArgs)->getBeginLoc(),
4378          diag::err_typecheck_call_too_many_args)
4379         << 0 << AdjustedNumArgs << TheCall->getNumArgs()
4380         << TheCall->getCallee()->getSourceRange();
4381     return ExprError();
4382   }
4383 
4384   // Inspect the first argument of the atomic operation.
4385   Expr *Ptr = TheCall->getArg(0);
4386   ExprResult ConvertedPtr = DefaultFunctionArrayLvalueConversion(Ptr);
4387   if (ConvertedPtr.isInvalid())
4388     return ExprError();
4389 
4390   Ptr = ConvertedPtr.get();
4391   const PointerType *pointerType = Ptr->getType()->getAs<PointerType>();
4392   if (!pointerType) {
4393     Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
4394         << Ptr->getType() << Ptr->getSourceRange();
4395     return ExprError();
4396   }
4397 
4398   // For a __c11 builtin, this should be a pointer to an _Atomic type.
4399   QualType AtomTy = pointerType->getPointeeType(); // 'A'
4400   QualType ValType = AtomTy; // 'C'
4401   if (IsC11) {
4402     if (!AtomTy->isAtomicType()) {
4403       Diag(DRE->getBeginLoc(), diag::err_atomic_op_needs_atomic)
4404           << Ptr->getType() << Ptr->getSourceRange();
4405       return ExprError();
4406     }
4407     if ((Form != Load && Form != LoadCopy && AtomTy.isConstQualified()) ||
4408         AtomTy.getAddressSpace() == LangAS::opencl_constant) {
4409       Diag(DRE->getBeginLoc(), diag::err_atomic_op_needs_non_const_atomic)
4410           << (AtomTy.isConstQualified() ? 0 : 1) << Ptr->getType()
4411           << Ptr->getSourceRange();
4412       return ExprError();
4413     }
4414     ValType = AtomTy->getAs<AtomicType>()->getValueType();
4415   } else if (Form != Load && Form != LoadCopy) {
4416     if (ValType.isConstQualified()) {
4417       Diag(DRE->getBeginLoc(), diag::err_atomic_op_needs_non_const_pointer)
4418           << Ptr->getType() << Ptr->getSourceRange();
4419       return ExprError();
4420     }
4421   }
4422 
4423   // For an arithmetic operation, the implied arithmetic must be well-formed.
4424   if (Form == Arithmetic) {
4425     // gcc does not enforce these rules for GNU atomics, but we do so for sanity.
4426     if (IsAddSub && !ValType->isIntegerType()
4427         && !ValType->isPointerType()) {
4428       Diag(DRE->getBeginLoc(), diag::err_atomic_op_needs_atomic_int_or_ptr)
4429           << IsC11 << Ptr->getType() << Ptr->getSourceRange();
4430       return ExprError();
4431     }
4432     if (IsMinMax) {
4433       const BuiltinType *BT = ValType->getAs<BuiltinType>();
4434       if (!BT || (BT->getKind() != BuiltinType::Int &&
4435                   BT->getKind() != BuiltinType::UInt)) {
4436         Diag(DRE->getBeginLoc(), diag::err_atomic_op_needs_int32_or_ptr);
4437         return ExprError();
4438       }
4439     }
4440     if (!IsAddSub && !IsMinMax && !ValType->isIntegerType()) {
4441       Diag(DRE->getBeginLoc(), diag::err_atomic_op_bitwise_needs_atomic_int)
4442           << IsC11 << Ptr->getType() << Ptr->getSourceRange();
4443       return ExprError();
4444     }
4445     if (IsC11 && ValType->isPointerType() &&
4446         RequireCompleteType(Ptr->getBeginLoc(), ValType->getPointeeType(),
4447                             diag::err_incomplete_type)) {
4448       return ExprError();
4449     }
4450   } else if (IsN && !ValType->isIntegerType() && !ValType->isPointerType()) {
4451     // For __atomic_*_n operations, the value type must be a scalar integral or
4452     // pointer type which is 1, 2, 4, 8 or 16 bytes in length.
4453     Diag(DRE->getBeginLoc(), diag::err_atomic_op_needs_atomic_int_or_ptr)
4454         << IsC11 << Ptr->getType() << Ptr->getSourceRange();
4455     return ExprError();
4456   }
4457 
4458   if (!IsC11 && !AtomTy.isTriviallyCopyableType(Context) &&
4459       !AtomTy->isScalarType()) {
4460     // For GNU atomics, require a trivially-copyable type. This is not part of
4461     // the GNU atomics specification, but we enforce it for sanity.
4462     Diag(DRE->getBeginLoc(), diag::err_atomic_op_needs_trivial_copy)
4463         << Ptr->getType() << Ptr->getSourceRange();
4464     return ExprError();
4465   }
4466 
4467   switch (ValType.getObjCLifetime()) {
4468   case Qualifiers::OCL_None:
4469   case Qualifiers::OCL_ExplicitNone:
4470     // okay
4471     break;
4472 
4473   case Qualifiers::OCL_Weak:
4474   case Qualifiers::OCL_Strong:
4475   case Qualifiers::OCL_Autoreleasing:
4476     // FIXME: Can this happen? By this point, ValType should be known
4477     // to be trivially copyable.
4478     Diag(DRE->getBeginLoc(), diag::err_arc_atomic_ownership)
4479         << ValType << Ptr->getSourceRange();
4480     return ExprError();
4481   }
4482 
4483   // All atomic operations have an overload which takes a pointer to a volatile
4484   // 'A'.  We shouldn't let the volatile-ness of the pointee-type inject itself
4485   // into the result or the other operands. Similarly atomic_load takes a
4486   // pointer to a const 'A'.
4487   ValType.removeLocalVolatile();
4488   ValType.removeLocalConst();
4489   QualType ResultType = ValType;
4490   if (Form == Copy || Form == LoadCopy || Form == GNUXchg ||
4491       Form == Init)
4492     ResultType = Context.VoidTy;
4493   else if (Form == C11CmpXchg || Form == GNUCmpXchg)
4494     ResultType = Context.BoolTy;
4495 
4496   // The type of a parameter passed 'by value'. In the GNU atomics, such
4497   // arguments are actually passed as pointers.
4498   QualType ByValType = ValType; // 'CP'
4499   bool IsPassedByAddress = false;
4500   if (!IsC11 && !IsN) {
4501     ByValType = Ptr->getType();
4502     IsPassedByAddress = true;
4503   }
4504 
4505   // The first argument's non-CV pointer type is used to deduce the type of
4506   // subsequent arguments, except for:
4507   //  - weak flag (always converted to bool)
4508   //  - memory order (always converted to int)
4509   //  - scope  (always converted to int)
4510   for (unsigned i = 0; i != TheCall->getNumArgs(); ++i) {
4511     QualType Ty;
4512     if (i < NumVals[Form] + 1) {
4513       switch (i) {
4514       case 0:
4515         // The first argument is always a pointer. It has a fixed type.
4516         // It is always dereferenced, a nullptr is undefined.
4517         CheckNonNullArgument(*this, TheCall->getArg(i), DRE->getBeginLoc());
4518         // Nothing else to do: we already know all we want about this pointer.
4519         continue;
4520       case 1:
4521         // The second argument is the non-atomic operand. For arithmetic, this
4522         // is always passed by value, and for a compare_exchange it is always
4523         // passed by address. For the rest, GNU uses by-address and C11 uses
4524         // by-value.
4525         assert(Form != Load);
4526         if (Form == Init || (Form == Arithmetic && ValType->isIntegerType()))
4527           Ty = ValType;
4528         else if (Form == Copy || Form == Xchg) {
4529           if (IsPassedByAddress)
4530             // The value pointer is always dereferenced, a nullptr is undefined.
4531             CheckNonNullArgument(*this, TheCall->getArg(i), DRE->getBeginLoc());
4532           Ty = ByValType;
4533         } else if (Form == Arithmetic)
4534           Ty = Context.getPointerDiffType();
4535         else {
4536           Expr *ValArg = TheCall->getArg(i);
4537           // The value pointer is always dereferenced, a nullptr is undefined.
4538           CheckNonNullArgument(*this, ValArg, DRE->getBeginLoc());
4539           LangAS AS = LangAS::Default;
4540           // Keep address space of non-atomic pointer type.
4541           if (const PointerType *PtrTy =
4542                   ValArg->getType()->getAs<PointerType>()) {
4543             AS = PtrTy->getPointeeType().getAddressSpace();
4544           }
4545           Ty = Context.getPointerType(
4546               Context.getAddrSpaceQualType(ValType.getUnqualifiedType(), AS));
4547         }
4548         break;
4549       case 2:
4550         // The third argument to compare_exchange / GNU exchange is the desired
4551         // value, either by-value (for the C11 and *_n variant) or as a pointer.
4552         if (IsPassedByAddress)
4553           CheckNonNullArgument(*this, TheCall->getArg(i), DRE->getBeginLoc());
4554         Ty = ByValType;
4555         break;
4556       case 3:
4557         // The fourth argument to GNU compare_exchange is a 'weak' flag.
4558         Ty = Context.BoolTy;
4559         break;
4560       }
4561     } else {
4562       // The order(s) and scope are always converted to int.
4563       Ty = Context.IntTy;
4564     }
4565 
4566     InitializedEntity Entity =
4567         InitializedEntity::InitializeParameter(Context, Ty, false);
4568     ExprResult Arg = TheCall->getArg(i);
4569     Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
4570     if (Arg.isInvalid())
4571       return true;
4572     TheCall->setArg(i, Arg.get());
4573   }
4574 
4575   // Permute the arguments into a 'consistent' order.
4576   SmallVector<Expr*, 5> SubExprs;
4577   SubExprs.push_back(Ptr);
4578   switch (Form) {
4579   case Init:
4580     // Note, AtomicExpr::getVal1() has a special case for this atomic.
4581     SubExprs.push_back(TheCall->getArg(1)); // Val1
4582     break;
4583   case Load:
4584     SubExprs.push_back(TheCall->getArg(1)); // Order
4585     break;
4586   case LoadCopy:
4587   case Copy:
4588   case Arithmetic:
4589   case Xchg:
4590     SubExprs.push_back(TheCall->getArg(2)); // Order
4591     SubExprs.push_back(TheCall->getArg(1)); // Val1
4592     break;
4593   case GNUXchg:
4594     // Note, AtomicExpr::getVal2() has a special case for this atomic.
4595     SubExprs.push_back(TheCall->getArg(3)); // Order
4596     SubExprs.push_back(TheCall->getArg(1)); // Val1
4597     SubExprs.push_back(TheCall->getArg(2)); // Val2
4598     break;
4599   case C11CmpXchg:
4600     SubExprs.push_back(TheCall->getArg(3)); // Order
4601     SubExprs.push_back(TheCall->getArg(1)); // Val1
4602     SubExprs.push_back(TheCall->getArg(4)); // OrderFail
4603     SubExprs.push_back(TheCall->getArg(2)); // Val2
4604     break;
4605   case GNUCmpXchg:
4606     SubExprs.push_back(TheCall->getArg(4)); // Order
4607     SubExprs.push_back(TheCall->getArg(1)); // Val1
4608     SubExprs.push_back(TheCall->getArg(5)); // OrderFail
4609     SubExprs.push_back(TheCall->getArg(2)); // Val2
4610     SubExprs.push_back(TheCall->getArg(3)); // Weak
4611     break;
4612   }
4613 
4614   if (SubExprs.size() >= 2 && Form != Init) {
4615     llvm::APSInt Result(32);
4616     if (SubExprs[1]->isIntegerConstantExpr(Result, Context) &&
4617         !isValidOrderingForOp(Result.getSExtValue(), Op))
4618       Diag(SubExprs[1]->getBeginLoc(),
4619            diag::warn_atomic_op_has_invalid_memory_order)
4620           << SubExprs[1]->getSourceRange();
4621   }
4622 
4623   if (auto ScopeModel = AtomicExpr::getScopeModel(Op)) {
4624     auto *Scope = TheCall->getArg(TheCall->getNumArgs() - 1);
4625     llvm::APSInt Result(32);
4626     if (Scope->isIntegerConstantExpr(Result, Context) &&
4627         !ScopeModel->isValid(Result.getZExtValue())) {
4628       Diag(Scope->getBeginLoc(), diag::err_atomic_op_has_invalid_synch_scope)
4629           << Scope->getSourceRange();
4630     }
4631     SubExprs.push_back(Scope);
4632   }
4633 
4634   AtomicExpr *AE =
4635       new (Context) AtomicExpr(TheCall->getCallee()->getBeginLoc(), SubExprs,
4636                                ResultType, Op, TheCall->getRParenLoc());
4637 
4638   if ((Op == AtomicExpr::AO__c11_atomic_load ||
4639        Op == AtomicExpr::AO__c11_atomic_store ||
4640        Op == AtomicExpr::AO__opencl_atomic_load ||
4641        Op == AtomicExpr::AO__opencl_atomic_store ) &&
4642       Context.AtomicUsesUnsupportedLibcall(AE))
4643     Diag(AE->getBeginLoc(), diag::err_atomic_load_store_uses_lib)
4644         << ((Op == AtomicExpr::AO__c11_atomic_load ||
4645              Op == AtomicExpr::AO__opencl_atomic_load)
4646                 ? 0
4647                 : 1);
4648 
4649   return AE;
4650 }
4651 
4652 /// checkBuiltinArgument - Given a call to a builtin function, perform
4653 /// normal type-checking on the given argument, updating the call in
4654 /// place.  This is useful when a builtin function requires custom
4655 /// type-checking for some of its arguments but not necessarily all of
4656 /// them.
4657 ///
4658 /// Returns true on error.
4659 static bool checkBuiltinArgument(Sema &S, CallExpr *E, unsigned ArgIndex) {
4660   FunctionDecl *Fn = E->getDirectCallee();
4661   assert(Fn && "builtin call without direct callee!");
4662 
4663   ParmVarDecl *Param = Fn->getParamDecl(ArgIndex);
4664   InitializedEntity Entity =
4665     InitializedEntity::InitializeParameter(S.Context, Param);
4666 
4667   ExprResult Arg = E->getArg(0);
4668   Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg);
4669   if (Arg.isInvalid())
4670     return true;
4671 
4672   E->setArg(ArgIndex, Arg.get());
4673   return false;
4674 }
4675 
4676 /// We have a call to a function like __sync_fetch_and_add, which is an
4677 /// overloaded function based on the pointer type of its first argument.
4678 /// The main ActOnCallExpr routines have already promoted the types of
4679 /// arguments because all of these calls are prototyped as void(...).
4680 ///
4681 /// This function goes through and does final semantic checking for these
4682 /// builtins, as well as generating any warnings.
4683 ExprResult
4684 Sema::SemaBuiltinAtomicOverloaded(ExprResult TheCallResult) {
4685   CallExpr *TheCall = static_cast<CallExpr *>(TheCallResult.get());
4686   Expr *Callee = TheCall->getCallee();
4687   DeclRefExpr *DRE = cast<DeclRefExpr>(Callee->IgnoreParenCasts());
4688   FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
4689 
4690   // Ensure that we have at least one argument to do type inference from.
4691   if (TheCall->getNumArgs() < 1) {
4692     Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
4693         << 0 << 1 << TheCall->getNumArgs() << Callee->getSourceRange();
4694     return ExprError();
4695   }
4696 
4697   // Inspect the first argument of the atomic builtin.  This should always be
4698   // a pointer type, whose element is an integral scalar or pointer type.
4699   // Because it is a pointer type, we don't have to worry about any implicit
4700   // casts here.
4701   // FIXME: We don't allow floating point scalars as input.
4702   Expr *FirstArg = TheCall->getArg(0);
4703   ExprResult FirstArgResult = DefaultFunctionArrayLvalueConversion(FirstArg);
4704   if (FirstArgResult.isInvalid())
4705     return ExprError();
4706   FirstArg = FirstArgResult.get();
4707   TheCall->setArg(0, FirstArg);
4708 
4709   const PointerType *pointerType = FirstArg->getType()->getAs<PointerType>();
4710   if (!pointerType) {
4711     Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer)
4712         << FirstArg->getType() << FirstArg->getSourceRange();
4713     return ExprError();
4714   }
4715 
4716   QualType ValType = pointerType->getPointeeType();
4717   if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
4718       !ValType->isBlockPointerType()) {
4719     Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_must_be_pointer_intptr)
4720         << FirstArg->getType() << FirstArg->getSourceRange();
4721     return ExprError();
4722   }
4723 
4724   if (ValType.isConstQualified()) {
4725     Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_cannot_be_const)
4726         << FirstArg->getType() << FirstArg->getSourceRange();
4727     return ExprError();
4728   }
4729 
4730   switch (ValType.getObjCLifetime()) {
4731   case Qualifiers::OCL_None:
4732   case Qualifiers::OCL_ExplicitNone:
4733     // okay
4734     break;
4735 
4736   case Qualifiers::OCL_Weak:
4737   case Qualifiers::OCL_Strong:
4738   case Qualifiers::OCL_Autoreleasing:
4739     Diag(DRE->getBeginLoc(), diag::err_arc_atomic_ownership)
4740         << ValType << FirstArg->getSourceRange();
4741     return ExprError();
4742   }
4743 
4744   // Strip any qualifiers off ValType.
4745   ValType = ValType.getUnqualifiedType();
4746 
4747   // The majority of builtins return a value, but a few have special return
4748   // types, so allow them to override appropriately below.
4749   QualType ResultType = ValType;
4750 
4751   // We need to figure out which concrete builtin this maps onto.  For example,
4752   // __sync_fetch_and_add with a 2 byte object turns into
4753   // __sync_fetch_and_add_2.
4754 #define BUILTIN_ROW(x) \
4755   { Builtin::BI##x##_1, Builtin::BI##x##_2, Builtin::BI##x##_4, \
4756     Builtin::BI##x##_8, Builtin::BI##x##_16 }
4757 
4758   static const unsigned BuiltinIndices[][5] = {
4759     BUILTIN_ROW(__sync_fetch_and_add),
4760     BUILTIN_ROW(__sync_fetch_and_sub),
4761     BUILTIN_ROW(__sync_fetch_and_or),
4762     BUILTIN_ROW(__sync_fetch_and_and),
4763     BUILTIN_ROW(__sync_fetch_and_xor),
4764     BUILTIN_ROW(__sync_fetch_and_nand),
4765 
4766     BUILTIN_ROW(__sync_add_and_fetch),
4767     BUILTIN_ROW(__sync_sub_and_fetch),
4768     BUILTIN_ROW(__sync_and_and_fetch),
4769     BUILTIN_ROW(__sync_or_and_fetch),
4770     BUILTIN_ROW(__sync_xor_and_fetch),
4771     BUILTIN_ROW(__sync_nand_and_fetch),
4772 
4773     BUILTIN_ROW(__sync_val_compare_and_swap),
4774     BUILTIN_ROW(__sync_bool_compare_and_swap),
4775     BUILTIN_ROW(__sync_lock_test_and_set),
4776     BUILTIN_ROW(__sync_lock_release),
4777     BUILTIN_ROW(__sync_swap)
4778   };
4779 #undef BUILTIN_ROW
4780 
4781   // Determine the index of the size.
4782   unsigned SizeIndex;
4783   switch (Context.getTypeSizeInChars(ValType).getQuantity()) {
4784   case 1: SizeIndex = 0; break;
4785   case 2: SizeIndex = 1; break;
4786   case 4: SizeIndex = 2; break;
4787   case 8: SizeIndex = 3; break;
4788   case 16: SizeIndex = 4; break;
4789   default:
4790     Diag(DRE->getBeginLoc(), diag::err_atomic_builtin_pointer_size)
4791         << FirstArg->getType() << FirstArg->getSourceRange();
4792     return ExprError();
4793   }
4794 
4795   // Each of these builtins has one pointer argument, followed by some number of
4796   // values (0, 1 or 2) followed by a potentially empty varags list of stuff
4797   // that we ignore.  Find out which row of BuiltinIndices to read from as well
4798   // as the number of fixed args.
4799   unsigned BuiltinID = FDecl->getBuiltinID();
4800   unsigned BuiltinIndex, NumFixed = 1;
4801   bool WarnAboutSemanticsChange = false;
4802   switch (BuiltinID) {
4803   default: llvm_unreachable("Unknown overloaded atomic builtin!");
4804   case Builtin::BI__sync_fetch_and_add:
4805   case Builtin::BI__sync_fetch_and_add_1:
4806   case Builtin::BI__sync_fetch_and_add_2:
4807   case Builtin::BI__sync_fetch_and_add_4:
4808   case Builtin::BI__sync_fetch_and_add_8:
4809   case Builtin::BI__sync_fetch_and_add_16:
4810     BuiltinIndex = 0;
4811     break;
4812 
4813   case Builtin::BI__sync_fetch_and_sub:
4814   case Builtin::BI__sync_fetch_and_sub_1:
4815   case Builtin::BI__sync_fetch_and_sub_2:
4816   case Builtin::BI__sync_fetch_and_sub_4:
4817   case Builtin::BI__sync_fetch_and_sub_8:
4818   case Builtin::BI__sync_fetch_and_sub_16:
4819     BuiltinIndex = 1;
4820     break;
4821 
4822   case Builtin::BI__sync_fetch_and_or:
4823   case Builtin::BI__sync_fetch_and_or_1:
4824   case Builtin::BI__sync_fetch_and_or_2:
4825   case Builtin::BI__sync_fetch_and_or_4:
4826   case Builtin::BI__sync_fetch_and_or_8:
4827   case Builtin::BI__sync_fetch_and_or_16:
4828     BuiltinIndex = 2;
4829     break;
4830 
4831   case Builtin::BI__sync_fetch_and_and:
4832   case Builtin::BI__sync_fetch_and_and_1:
4833   case Builtin::BI__sync_fetch_and_and_2:
4834   case Builtin::BI__sync_fetch_and_and_4:
4835   case Builtin::BI__sync_fetch_and_and_8:
4836   case Builtin::BI__sync_fetch_and_and_16:
4837     BuiltinIndex = 3;
4838     break;
4839 
4840   case Builtin::BI__sync_fetch_and_xor:
4841   case Builtin::BI__sync_fetch_and_xor_1:
4842   case Builtin::BI__sync_fetch_and_xor_2:
4843   case Builtin::BI__sync_fetch_and_xor_4:
4844   case Builtin::BI__sync_fetch_and_xor_8:
4845   case Builtin::BI__sync_fetch_and_xor_16:
4846     BuiltinIndex = 4;
4847     break;
4848 
4849   case Builtin::BI__sync_fetch_and_nand:
4850   case Builtin::BI__sync_fetch_and_nand_1:
4851   case Builtin::BI__sync_fetch_and_nand_2:
4852   case Builtin::BI__sync_fetch_and_nand_4:
4853   case Builtin::BI__sync_fetch_and_nand_8:
4854   case Builtin::BI__sync_fetch_and_nand_16:
4855     BuiltinIndex = 5;
4856     WarnAboutSemanticsChange = true;
4857     break;
4858 
4859   case Builtin::BI__sync_add_and_fetch:
4860   case Builtin::BI__sync_add_and_fetch_1:
4861   case Builtin::BI__sync_add_and_fetch_2:
4862   case Builtin::BI__sync_add_and_fetch_4:
4863   case Builtin::BI__sync_add_and_fetch_8:
4864   case Builtin::BI__sync_add_and_fetch_16:
4865     BuiltinIndex = 6;
4866     break;
4867 
4868   case Builtin::BI__sync_sub_and_fetch:
4869   case Builtin::BI__sync_sub_and_fetch_1:
4870   case Builtin::BI__sync_sub_and_fetch_2:
4871   case Builtin::BI__sync_sub_and_fetch_4:
4872   case Builtin::BI__sync_sub_and_fetch_8:
4873   case Builtin::BI__sync_sub_and_fetch_16:
4874     BuiltinIndex = 7;
4875     break;
4876 
4877   case Builtin::BI__sync_and_and_fetch:
4878   case Builtin::BI__sync_and_and_fetch_1:
4879   case Builtin::BI__sync_and_and_fetch_2:
4880   case Builtin::BI__sync_and_and_fetch_4:
4881   case Builtin::BI__sync_and_and_fetch_8:
4882   case Builtin::BI__sync_and_and_fetch_16:
4883     BuiltinIndex = 8;
4884     break;
4885 
4886   case Builtin::BI__sync_or_and_fetch:
4887   case Builtin::BI__sync_or_and_fetch_1:
4888   case Builtin::BI__sync_or_and_fetch_2:
4889   case Builtin::BI__sync_or_and_fetch_4:
4890   case Builtin::BI__sync_or_and_fetch_8:
4891   case Builtin::BI__sync_or_and_fetch_16:
4892     BuiltinIndex = 9;
4893     break;
4894 
4895   case Builtin::BI__sync_xor_and_fetch:
4896   case Builtin::BI__sync_xor_and_fetch_1:
4897   case Builtin::BI__sync_xor_and_fetch_2:
4898   case Builtin::BI__sync_xor_and_fetch_4:
4899   case Builtin::BI__sync_xor_and_fetch_8:
4900   case Builtin::BI__sync_xor_and_fetch_16:
4901     BuiltinIndex = 10;
4902     break;
4903 
4904   case Builtin::BI__sync_nand_and_fetch:
4905   case Builtin::BI__sync_nand_and_fetch_1:
4906   case Builtin::BI__sync_nand_and_fetch_2:
4907   case Builtin::BI__sync_nand_and_fetch_4:
4908   case Builtin::BI__sync_nand_and_fetch_8:
4909   case Builtin::BI__sync_nand_and_fetch_16:
4910     BuiltinIndex = 11;
4911     WarnAboutSemanticsChange = true;
4912     break;
4913 
4914   case Builtin::BI__sync_val_compare_and_swap:
4915   case Builtin::BI__sync_val_compare_and_swap_1:
4916   case Builtin::BI__sync_val_compare_and_swap_2:
4917   case Builtin::BI__sync_val_compare_and_swap_4:
4918   case Builtin::BI__sync_val_compare_and_swap_8:
4919   case Builtin::BI__sync_val_compare_and_swap_16:
4920     BuiltinIndex = 12;
4921     NumFixed = 2;
4922     break;
4923 
4924   case Builtin::BI__sync_bool_compare_and_swap:
4925   case Builtin::BI__sync_bool_compare_and_swap_1:
4926   case Builtin::BI__sync_bool_compare_and_swap_2:
4927   case Builtin::BI__sync_bool_compare_and_swap_4:
4928   case Builtin::BI__sync_bool_compare_and_swap_8:
4929   case Builtin::BI__sync_bool_compare_and_swap_16:
4930     BuiltinIndex = 13;
4931     NumFixed = 2;
4932     ResultType = Context.BoolTy;
4933     break;
4934 
4935   case Builtin::BI__sync_lock_test_and_set:
4936   case Builtin::BI__sync_lock_test_and_set_1:
4937   case Builtin::BI__sync_lock_test_and_set_2:
4938   case Builtin::BI__sync_lock_test_and_set_4:
4939   case Builtin::BI__sync_lock_test_and_set_8:
4940   case Builtin::BI__sync_lock_test_and_set_16:
4941     BuiltinIndex = 14;
4942     break;
4943 
4944   case Builtin::BI__sync_lock_release:
4945   case Builtin::BI__sync_lock_release_1:
4946   case Builtin::BI__sync_lock_release_2:
4947   case Builtin::BI__sync_lock_release_4:
4948   case Builtin::BI__sync_lock_release_8:
4949   case Builtin::BI__sync_lock_release_16:
4950     BuiltinIndex = 15;
4951     NumFixed = 0;
4952     ResultType = Context.VoidTy;
4953     break;
4954 
4955   case Builtin::BI__sync_swap:
4956   case Builtin::BI__sync_swap_1:
4957   case Builtin::BI__sync_swap_2:
4958   case Builtin::BI__sync_swap_4:
4959   case Builtin::BI__sync_swap_8:
4960   case Builtin::BI__sync_swap_16:
4961     BuiltinIndex = 16;
4962     break;
4963   }
4964 
4965   // Now that we know how many fixed arguments we expect, first check that we
4966   // have at least that many.
4967   if (TheCall->getNumArgs() < 1+NumFixed) {
4968     Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args_at_least)
4969         << 0 << 1 + NumFixed << TheCall->getNumArgs()
4970         << Callee->getSourceRange();
4971     return ExprError();
4972   }
4973 
4974   Diag(TheCall->getEndLoc(), diag::warn_atomic_implicit_seq_cst)
4975       << Callee->getSourceRange();
4976 
4977   if (WarnAboutSemanticsChange) {
4978     Diag(TheCall->getEndLoc(), diag::warn_sync_fetch_and_nand_semantics_change)
4979         << Callee->getSourceRange();
4980   }
4981 
4982   // Get the decl for the concrete builtin from this, we can tell what the
4983   // concrete integer type we should convert to is.
4984   unsigned NewBuiltinID = BuiltinIndices[BuiltinIndex][SizeIndex];
4985   const char *NewBuiltinName = Context.BuiltinInfo.getName(NewBuiltinID);
4986   FunctionDecl *NewBuiltinDecl;
4987   if (NewBuiltinID == BuiltinID)
4988     NewBuiltinDecl = FDecl;
4989   else {
4990     // Perform builtin lookup to avoid redeclaring it.
4991     DeclarationName DN(&Context.Idents.get(NewBuiltinName));
4992     LookupResult Res(*this, DN, DRE->getBeginLoc(), LookupOrdinaryName);
4993     LookupName(Res, TUScope, /*AllowBuiltinCreation=*/true);
4994     assert(Res.getFoundDecl());
4995     NewBuiltinDecl = dyn_cast<FunctionDecl>(Res.getFoundDecl());
4996     if (!NewBuiltinDecl)
4997       return ExprError();
4998   }
4999 
5000   // The first argument --- the pointer --- has a fixed type; we
5001   // deduce the types of the rest of the arguments accordingly.  Walk
5002   // the remaining arguments, converting them to the deduced value type.
5003   for (unsigned i = 0; i != NumFixed; ++i) {
5004     ExprResult Arg = TheCall->getArg(i+1);
5005 
5006     // GCC does an implicit conversion to the pointer or integer ValType.  This
5007     // can fail in some cases (1i -> int**), check for this error case now.
5008     // Initialize the argument.
5009     InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
5010                                                    ValType, /*consume*/ false);
5011     Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
5012     if (Arg.isInvalid())
5013       return ExprError();
5014 
5015     // Okay, we have something that *can* be converted to the right type.  Check
5016     // to see if there is a potentially weird extension going on here.  This can
5017     // happen when you do an atomic operation on something like an char* and
5018     // pass in 42.  The 42 gets converted to char.  This is even more strange
5019     // for things like 45.123 -> char, etc.
5020     // FIXME: Do this check.
5021     TheCall->setArg(i+1, Arg.get());
5022   }
5023 
5024   ASTContext& Context = this->getASTContext();
5025 
5026   // Create a new DeclRefExpr to refer to the new decl.
5027   DeclRefExpr* NewDRE = DeclRefExpr::Create(
5028       Context,
5029       DRE->getQualifierLoc(),
5030       SourceLocation(),
5031       NewBuiltinDecl,
5032       /*enclosing*/ false,
5033       DRE->getLocation(),
5034       Context.BuiltinFnTy,
5035       DRE->getValueKind());
5036 
5037   // Set the callee in the CallExpr.
5038   // FIXME: This loses syntactic information.
5039   QualType CalleePtrTy = Context.getPointerType(NewBuiltinDecl->getType());
5040   ExprResult PromotedCall = ImpCastExprToType(NewDRE, CalleePtrTy,
5041                                               CK_BuiltinFnToFnPtr);
5042   TheCall->setCallee(PromotedCall.get());
5043 
5044   // Change the result type of the call to match the original value type. This
5045   // is arbitrary, but the codegen for these builtins ins design to handle it
5046   // gracefully.
5047   TheCall->setType(ResultType);
5048 
5049   return TheCallResult;
5050 }
5051 
5052 /// SemaBuiltinNontemporalOverloaded - We have a call to
5053 /// __builtin_nontemporal_store or __builtin_nontemporal_load, which is an
5054 /// overloaded function based on the pointer type of its last argument.
5055 ///
5056 /// This function goes through and does final semantic checking for these
5057 /// builtins.
5058 ExprResult Sema::SemaBuiltinNontemporalOverloaded(ExprResult TheCallResult) {
5059   CallExpr *TheCall = (CallExpr *)TheCallResult.get();
5060   DeclRefExpr *DRE =
5061       cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
5062   FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
5063   unsigned BuiltinID = FDecl->getBuiltinID();
5064   assert((BuiltinID == Builtin::BI__builtin_nontemporal_store ||
5065           BuiltinID == Builtin::BI__builtin_nontemporal_load) &&
5066          "Unexpected nontemporal load/store builtin!");
5067   bool isStore = BuiltinID == Builtin::BI__builtin_nontemporal_store;
5068   unsigned numArgs = isStore ? 2 : 1;
5069 
5070   // Ensure that we have the proper number of arguments.
5071   if (checkArgCount(*this, TheCall, numArgs))
5072     return ExprError();
5073 
5074   // Inspect the last argument of the nontemporal builtin.  This should always
5075   // be a pointer type, from which we imply the type of the memory access.
5076   // Because it is a pointer type, we don't have to worry about any implicit
5077   // casts here.
5078   Expr *PointerArg = TheCall->getArg(numArgs - 1);
5079   ExprResult PointerArgResult =
5080       DefaultFunctionArrayLvalueConversion(PointerArg);
5081 
5082   if (PointerArgResult.isInvalid())
5083     return ExprError();
5084   PointerArg = PointerArgResult.get();
5085   TheCall->setArg(numArgs - 1, PointerArg);
5086 
5087   const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
5088   if (!pointerType) {
5089     Diag(DRE->getBeginLoc(), diag::err_nontemporal_builtin_must_be_pointer)
5090         << PointerArg->getType() << PointerArg->getSourceRange();
5091     return ExprError();
5092   }
5093 
5094   QualType ValType = pointerType->getPointeeType();
5095 
5096   // Strip any qualifiers off ValType.
5097   ValType = ValType.getUnqualifiedType();
5098   if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
5099       !ValType->isBlockPointerType() && !ValType->isFloatingType() &&
5100       !ValType->isVectorType()) {
5101     Diag(DRE->getBeginLoc(),
5102          diag::err_nontemporal_builtin_must_be_pointer_intfltptr_or_vector)
5103         << PointerArg->getType() << PointerArg->getSourceRange();
5104     return ExprError();
5105   }
5106 
5107   if (!isStore) {
5108     TheCall->setType(ValType);
5109     return TheCallResult;
5110   }
5111 
5112   ExprResult ValArg = TheCall->getArg(0);
5113   InitializedEntity Entity = InitializedEntity::InitializeParameter(
5114       Context, ValType, /*consume*/ false);
5115   ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
5116   if (ValArg.isInvalid())
5117     return ExprError();
5118 
5119   TheCall->setArg(0, ValArg.get());
5120   TheCall->setType(Context.VoidTy);
5121   return TheCallResult;
5122 }
5123 
5124 /// CheckObjCString - Checks that the argument to the builtin
5125 /// CFString constructor is correct
5126 /// Note: It might also make sense to do the UTF-16 conversion here (would
5127 /// simplify the backend).
5128 bool Sema::CheckObjCString(Expr *Arg) {
5129   Arg = Arg->IgnoreParenCasts();
5130   StringLiteral *Literal = dyn_cast<StringLiteral>(Arg);
5131 
5132   if (!Literal || !Literal->isAscii()) {
5133     Diag(Arg->getBeginLoc(), diag::err_cfstring_literal_not_string_constant)
5134         << Arg->getSourceRange();
5135     return true;
5136   }
5137 
5138   if (Literal->containsNonAsciiOrNull()) {
5139     StringRef String = Literal->getString();
5140     unsigned NumBytes = String.size();
5141     SmallVector<llvm::UTF16, 128> ToBuf(NumBytes);
5142     const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)String.data();
5143     llvm::UTF16 *ToPtr = &ToBuf[0];
5144 
5145     llvm::ConversionResult Result =
5146         llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes, &ToPtr,
5147                                  ToPtr + NumBytes, llvm::strictConversion);
5148     // Check for conversion failure.
5149     if (Result != llvm::conversionOK)
5150       Diag(Arg->getBeginLoc(), diag::warn_cfstring_truncated)
5151           << Arg->getSourceRange();
5152   }
5153   return false;
5154 }
5155 
5156 /// CheckObjCString - Checks that the format string argument to the os_log()
5157 /// and os_trace() functions is correct, and converts it to const char *.
5158 ExprResult Sema::CheckOSLogFormatStringArg(Expr *Arg) {
5159   Arg = Arg->IgnoreParenCasts();
5160   auto *Literal = dyn_cast<StringLiteral>(Arg);
5161   if (!Literal) {
5162     if (auto *ObjcLiteral = dyn_cast<ObjCStringLiteral>(Arg)) {
5163       Literal = ObjcLiteral->getString();
5164     }
5165   }
5166 
5167   if (!Literal || (!Literal->isAscii() && !Literal->isUTF8())) {
5168     return ExprError(
5169         Diag(Arg->getBeginLoc(), diag::err_os_log_format_not_string_constant)
5170         << Arg->getSourceRange());
5171   }
5172 
5173   ExprResult Result(Literal);
5174   QualType ResultTy = Context.getPointerType(Context.CharTy.withConst());
5175   InitializedEntity Entity =
5176       InitializedEntity::InitializeParameter(Context, ResultTy, false);
5177   Result = PerformCopyInitialization(Entity, SourceLocation(), Result);
5178   return Result;
5179 }
5180 
5181 /// Check that the user is calling the appropriate va_start builtin for the
5182 /// target and calling convention.
5183 static bool checkVAStartABI(Sema &S, unsigned BuiltinID, Expr *Fn) {
5184   const llvm::Triple &TT = S.Context.getTargetInfo().getTriple();
5185   bool IsX64 = TT.getArch() == llvm::Triple::x86_64;
5186   bool IsAArch64 = TT.getArch() == llvm::Triple::aarch64;
5187   bool IsWindows = TT.isOSWindows();
5188   bool IsMSVAStart = BuiltinID == Builtin::BI__builtin_ms_va_start;
5189   if (IsX64 || IsAArch64) {
5190     CallingConv CC = CC_C;
5191     if (const FunctionDecl *FD = S.getCurFunctionDecl())
5192       CC = FD->getType()->getAs<FunctionType>()->getCallConv();
5193     if (IsMSVAStart) {
5194       // Don't allow this in System V ABI functions.
5195       if (CC == CC_X86_64SysV || (!IsWindows && CC != CC_Win64))
5196         return S.Diag(Fn->getBeginLoc(),
5197                       diag::err_ms_va_start_used_in_sysv_function);
5198     } else {
5199       // On x86-64/AArch64 Unix, don't allow this in Win64 ABI functions.
5200       // On x64 Windows, don't allow this in System V ABI functions.
5201       // (Yes, that means there's no corresponding way to support variadic
5202       // System V ABI functions on Windows.)
5203       if ((IsWindows && CC == CC_X86_64SysV) ||
5204           (!IsWindows && CC == CC_Win64))
5205         return S.Diag(Fn->getBeginLoc(),
5206                       diag::err_va_start_used_in_wrong_abi_function)
5207                << !IsWindows;
5208     }
5209     return false;
5210   }
5211 
5212   if (IsMSVAStart)
5213     return S.Diag(Fn->getBeginLoc(), diag::err_builtin_x64_aarch64_only);
5214   return false;
5215 }
5216 
5217 static bool checkVAStartIsInVariadicFunction(Sema &S, Expr *Fn,
5218                                              ParmVarDecl **LastParam = nullptr) {
5219   // Determine whether the current function, block, or obj-c method is variadic
5220   // and get its parameter list.
5221   bool IsVariadic = false;
5222   ArrayRef<ParmVarDecl *> Params;
5223   DeclContext *Caller = S.CurContext;
5224   if (auto *Block = dyn_cast<BlockDecl>(Caller)) {
5225     IsVariadic = Block->isVariadic();
5226     Params = Block->parameters();
5227   } else if (auto *FD = dyn_cast<FunctionDecl>(Caller)) {
5228     IsVariadic = FD->isVariadic();
5229     Params = FD->parameters();
5230   } else if (auto *MD = dyn_cast<ObjCMethodDecl>(Caller)) {
5231     IsVariadic = MD->isVariadic();
5232     // FIXME: This isn't correct for methods (results in bogus warning).
5233     Params = MD->parameters();
5234   } else if (isa<CapturedDecl>(Caller)) {
5235     // We don't support va_start in a CapturedDecl.
5236     S.Diag(Fn->getBeginLoc(), diag::err_va_start_captured_stmt);
5237     return true;
5238   } else {
5239     // This must be some other declcontext that parses exprs.
5240     S.Diag(Fn->getBeginLoc(), diag::err_va_start_outside_function);
5241     return true;
5242   }
5243 
5244   if (!IsVariadic) {
5245     S.Diag(Fn->getBeginLoc(), diag::err_va_start_fixed_function);
5246     return true;
5247   }
5248 
5249   if (LastParam)
5250     *LastParam = Params.empty() ? nullptr : Params.back();
5251 
5252   return false;
5253 }
5254 
5255 /// Check the arguments to '__builtin_va_start' or '__builtin_ms_va_start'
5256 /// for validity.  Emit an error and return true on failure; return false
5257 /// on success.
5258 bool Sema::SemaBuiltinVAStart(unsigned BuiltinID, CallExpr *TheCall) {
5259   Expr *Fn = TheCall->getCallee();
5260 
5261   if (checkVAStartABI(*this, BuiltinID, Fn))
5262     return true;
5263 
5264   if (TheCall->getNumArgs() > 2) {
5265     Diag(TheCall->getArg(2)->getBeginLoc(),
5266          diag::err_typecheck_call_too_many_args)
5267         << 0 /*function call*/ << 2 << TheCall->getNumArgs()
5268         << Fn->getSourceRange()
5269         << SourceRange(TheCall->getArg(2)->getBeginLoc(),
5270                        (*(TheCall->arg_end() - 1))->getEndLoc());
5271     return true;
5272   }
5273 
5274   if (TheCall->getNumArgs() < 2) {
5275     return Diag(TheCall->getEndLoc(),
5276                 diag::err_typecheck_call_too_few_args_at_least)
5277            << 0 /*function call*/ << 2 << TheCall->getNumArgs();
5278   }
5279 
5280   // Type-check the first argument normally.
5281   if (checkBuiltinArgument(*this, TheCall, 0))
5282     return true;
5283 
5284   // Check that the current function is variadic, and get its last parameter.
5285   ParmVarDecl *LastParam;
5286   if (checkVAStartIsInVariadicFunction(*this, Fn, &LastParam))
5287     return true;
5288 
5289   // Verify that the second argument to the builtin is the last argument of the
5290   // current function or method.
5291   bool SecondArgIsLastNamedArgument = false;
5292   const Expr *Arg = TheCall->getArg(1)->IgnoreParenCasts();
5293 
5294   // These are valid if SecondArgIsLastNamedArgument is false after the next
5295   // block.
5296   QualType Type;
5297   SourceLocation ParamLoc;
5298   bool IsCRegister = false;
5299 
5300   if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Arg)) {
5301     if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(DR->getDecl())) {
5302       SecondArgIsLastNamedArgument = PV == LastParam;
5303 
5304       Type = PV->getType();
5305       ParamLoc = PV->getLocation();
5306       IsCRegister =
5307           PV->getStorageClass() == SC_Register && !getLangOpts().CPlusPlus;
5308     }
5309   }
5310 
5311   if (!SecondArgIsLastNamedArgument)
5312     Diag(TheCall->getArg(1)->getBeginLoc(),
5313          diag::warn_second_arg_of_va_start_not_last_named_param);
5314   else if (IsCRegister || Type->isReferenceType() ||
5315            Type->isSpecificBuiltinType(BuiltinType::Float) || [=] {
5316              // Promotable integers are UB, but enumerations need a bit of
5317              // extra checking to see what their promotable type actually is.
5318              if (!Type->isPromotableIntegerType())
5319                return false;
5320              if (!Type->isEnumeralType())
5321                return true;
5322              const EnumDecl *ED = Type->getAs<EnumType>()->getDecl();
5323              return !(ED &&
5324                       Context.typesAreCompatible(ED->getPromotionType(), Type));
5325            }()) {
5326     unsigned Reason = 0;
5327     if (Type->isReferenceType())  Reason = 1;
5328     else if (IsCRegister)         Reason = 2;
5329     Diag(Arg->getBeginLoc(), diag::warn_va_start_type_is_undefined) << Reason;
5330     Diag(ParamLoc, diag::note_parameter_type) << Type;
5331   }
5332 
5333   TheCall->setType(Context.VoidTy);
5334   return false;
5335 }
5336 
5337 bool Sema::SemaBuiltinVAStartARMMicrosoft(CallExpr *Call) {
5338   // void __va_start(va_list *ap, const char *named_addr, size_t slot_size,
5339   //                 const char *named_addr);
5340 
5341   Expr *Func = Call->getCallee();
5342 
5343   if (Call->getNumArgs() < 3)
5344     return Diag(Call->getEndLoc(),
5345                 diag::err_typecheck_call_too_few_args_at_least)
5346            << 0 /*function call*/ << 3 << Call->getNumArgs();
5347 
5348   // Type-check the first argument normally.
5349   if (checkBuiltinArgument(*this, Call, 0))
5350     return true;
5351 
5352   // Check that the current function is variadic.
5353   if (checkVAStartIsInVariadicFunction(*this, Func))
5354     return true;
5355 
5356   // __va_start on Windows does not validate the parameter qualifiers
5357 
5358   const Expr *Arg1 = Call->getArg(1)->IgnoreParens();
5359   const Type *Arg1Ty = Arg1->getType().getCanonicalType().getTypePtr();
5360 
5361   const Expr *Arg2 = Call->getArg(2)->IgnoreParens();
5362   const Type *Arg2Ty = Arg2->getType().getCanonicalType().getTypePtr();
5363 
5364   const QualType &ConstCharPtrTy =
5365       Context.getPointerType(Context.CharTy.withConst());
5366   if (!Arg1Ty->isPointerType() ||
5367       Arg1Ty->getPointeeType().withoutLocalFastQualifiers() != Context.CharTy)
5368     Diag(Arg1->getBeginLoc(), diag::err_typecheck_convert_incompatible)
5369         << Arg1->getType() << ConstCharPtrTy << 1 /* different class */
5370         << 0                                      /* qualifier difference */
5371         << 3                                      /* parameter mismatch */
5372         << 2 << Arg1->getType() << ConstCharPtrTy;
5373 
5374   const QualType SizeTy = Context.getSizeType();
5375   if (Arg2Ty->getCanonicalTypeInternal().withoutLocalFastQualifiers() != SizeTy)
5376     Diag(Arg2->getBeginLoc(), diag::err_typecheck_convert_incompatible)
5377         << Arg2->getType() << SizeTy << 1 /* different class */
5378         << 0                              /* qualifier difference */
5379         << 3                              /* parameter mismatch */
5380         << 3 << Arg2->getType() << SizeTy;
5381 
5382   return false;
5383 }
5384 
5385 /// SemaBuiltinUnorderedCompare - Handle functions like __builtin_isgreater and
5386 /// friends.  This is declared to take (...), so we have to check everything.
5387 bool Sema::SemaBuiltinUnorderedCompare(CallExpr *TheCall) {
5388   if (TheCall->getNumArgs() < 2)
5389     return Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args)
5390            << 0 << 2 << TheCall->getNumArgs() /*function call*/;
5391   if (TheCall->getNumArgs() > 2)
5392     return Diag(TheCall->getArg(2)->getBeginLoc(),
5393                 diag::err_typecheck_call_too_many_args)
5394            << 0 /*function call*/ << 2 << TheCall->getNumArgs()
5395            << SourceRange(TheCall->getArg(2)->getBeginLoc(),
5396                           (*(TheCall->arg_end() - 1))->getEndLoc());
5397 
5398   ExprResult OrigArg0 = TheCall->getArg(0);
5399   ExprResult OrigArg1 = TheCall->getArg(1);
5400 
5401   // Do standard promotions between the two arguments, returning their common
5402   // type.
5403   QualType Res = UsualArithmeticConversions(OrigArg0, OrigArg1, false);
5404   if (OrigArg0.isInvalid() || OrigArg1.isInvalid())
5405     return true;
5406 
5407   // Make sure any conversions are pushed back into the call; this is
5408   // type safe since unordered compare builtins are declared as "_Bool
5409   // foo(...)".
5410   TheCall->setArg(0, OrigArg0.get());
5411   TheCall->setArg(1, OrigArg1.get());
5412 
5413   if (OrigArg0.get()->isTypeDependent() || OrigArg1.get()->isTypeDependent())
5414     return false;
5415 
5416   // If the common type isn't a real floating type, then the arguments were
5417   // invalid for this operation.
5418   if (Res.isNull() || !Res->isRealFloatingType())
5419     return Diag(OrigArg0.get()->getBeginLoc(),
5420                 diag::err_typecheck_call_invalid_ordered_compare)
5421            << OrigArg0.get()->getType() << OrigArg1.get()->getType()
5422            << SourceRange(OrigArg0.get()->getBeginLoc(),
5423                           OrigArg1.get()->getEndLoc());
5424 
5425   return false;
5426 }
5427 
5428 /// SemaBuiltinSemaBuiltinFPClassification - Handle functions like
5429 /// __builtin_isnan and friends.  This is declared to take (...), so we have
5430 /// to check everything. We expect the last argument to be a floating point
5431 /// value.
5432 bool Sema::SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs) {
5433   if (TheCall->getNumArgs() < NumArgs)
5434     return Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args)
5435            << 0 << NumArgs << TheCall->getNumArgs() /*function call*/;
5436   if (TheCall->getNumArgs() > NumArgs)
5437     return Diag(TheCall->getArg(NumArgs)->getBeginLoc(),
5438                 diag::err_typecheck_call_too_many_args)
5439            << 0 /*function call*/ << NumArgs << TheCall->getNumArgs()
5440            << SourceRange(TheCall->getArg(NumArgs)->getBeginLoc(),
5441                           (*(TheCall->arg_end() - 1))->getEndLoc());
5442 
5443   Expr *OrigArg = TheCall->getArg(NumArgs-1);
5444 
5445   if (OrigArg->isTypeDependent())
5446     return false;
5447 
5448   // This operation requires a non-_Complex floating-point number.
5449   if (!OrigArg->getType()->isRealFloatingType())
5450     return Diag(OrigArg->getBeginLoc(),
5451                 diag::err_typecheck_call_invalid_unary_fp)
5452            << OrigArg->getType() << OrigArg->getSourceRange();
5453 
5454   // If this is an implicit conversion from float -> float, double, or
5455   // long double, remove it.
5456   if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(OrigArg)) {
5457     // Only remove standard FloatCasts, leaving other casts inplace
5458     if (Cast->getCastKind() == CK_FloatingCast) {
5459       Expr *CastArg = Cast->getSubExpr();
5460       if (CastArg->getType()->isSpecificBuiltinType(BuiltinType::Float)) {
5461         assert(
5462             (Cast->getType()->isSpecificBuiltinType(BuiltinType::Double) ||
5463              Cast->getType()->isSpecificBuiltinType(BuiltinType::Float) ||
5464              Cast->getType()->isSpecificBuiltinType(BuiltinType::LongDouble)) &&
5465             "promotion from float to either float, double, or long double is "
5466             "the only expected cast here");
5467         Cast->setSubExpr(nullptr);
5468         TheCall->setArg(NumArgs-1, CastArg);
5469       }
5470     }
5471   }
5472 
5473   return false;
5474 }
5475 
5476 // Customized Sema Checking for VSX builtins that have the following signature:
5477 // vector [...] builtinName(vector [...], vector [...], const int);
5478 // Which takes the same type of vectors (any legal vector type) for the first
5479 // two arguments and takes compile time constant for the third argument.
5480 // Example builtins are :
5481 // vector double vec_xxpermdi(vector double, vector double, int);
5482 // vector short vec_xxsldwi(vector short, vector short, int);
5483 bool Sema::SemaBuiltinVSX(CallExpr *TheCall) {
5484   unsigned ExpectedNumArgs = 3;
5485   if (TheCall->getNumArgs() < ExpectedNumArgs)
5486     return Diag(TheCall->getEndLoc(),
5487                 diag::err_typecheck_call_too_few_args_at_least)
5488            << 0 /*function call*/ << ExpectedNumArgs << TheCall->getNumArgs()
5489            << TheCall->getSourceRange();
5490 
5491   if (TheCall->getNumArgs() > ExpectedNumArgs)
5492     return Diag(TheCall->getEndLoc(),
5493                 diag::err_typecheck_call_too_many_args_at_most)
5494            << 0 /*function call*/ << ExpectedNumArgs << TheCall->getNumArgs()
5495            << TheCall->getSourceRange();
5496 
5497   // Check the third argument is a compile time constant
5498   llvm::APSInt Value;
5499   if(!TheCall->getArg(2)->isIntegerConstantExpr(Value, Context))
5500     return Diag(TheCall->getBeginLoc(),
5501                 diag::err_vsx_builtin_nonconstant_argument)
5502            << 3 /* argument index */ << TheCall->getDirectCallee()
5503            << SourceRange(TheCall->getArg(2)->getBeginLoc(),
5504                           TheCall->getArg(2)->getEndLoc());
5505 
5506   QualType Arg1Ty = TheCall->getArg(0)->getType();
5507   QualType Arg2Ty = TheCall->getArg(1)->getType();
5508 
5509   // Check the type of argument 1 and argument 2 are vectors.
5510   SourceLocation BuiltinLoc = TheCall->getBeginLoc();
5511   if ((!Arg1Ty->isVectorType() && !Arg1Ty->isDependentType()) ||
5512       (!Arg2Ty->isVectorType() && !Arg2Ty->isDependentType())) {
5513     return Diag(BuiltinLoc, diag::err_vec_builtin_non_vector)
5514            << TheCall->getDirectCallee()
5515            << SourceRange(TheCall->getArg(0)->getBeginLoc(),
5516                           TheCall->getArg(1)->getEndLoc());
5517   }
5518 
5519   // Check the first two arguments are the same type.
5520   if (!Context.hasSameUnqualifiedType(Arg1Ty, Arg2Ty)) {
5521     return Diag(BuiltinLoc, diag::err_vec_builtin_incompatible_vector)
5522            << TheCall->getDirectCallee()
5523            << SourceRange(TheCall->getArg(0)->getBeginLoc(),
5524                           TheCall->getArg(1)->getEndLoc());
5525   }
5526 
5527   // When default clang type checking is turned off and the customized type
5528   // checking is used, the returning type of the function must be explicitly
5529   // set. Otherwise it is _Bool by default.
5530   TheCall->setType(Arg1Ty);
5531 
5532   return false;
5533 }
5534 
5535 /// SemaBuiltinShuffleVector - Handle __builtin_shufflevector.
5536 // This is declared to take (...), so we have to check everything.
5537 ExprResult Sema::SemaBuiltinShuffleVector(CallExpr *TheCall) {
5538   if (TheCall->getNumArgs() < 2)
5539     return ExprError(Diag(TheCall->getEndLoc(),
5540                           diag::err_typecheck_call_too_few_args_at_least)
5541                      << 0 /*function call*/ << 2 << TheCall->getNumArgs()
5542                      << TheCall->getSourceRange());
5543 
5544   // Determine which of the following types of shufflevector we're checking:
5545   // 1) unary, vector mask: (lhs, mask)
5546   // 2) binary, scalar mask: (lhs, rhs, index, ..., index)
5547   QualType resType = TheCall->getArg(0)->getType();
5548   unsigned numElements = 0;
5549 
5550   if (!TheCall->getArg(0)->isTypeDependent() &&
5551       !TheCall->getArg(1)->isTypeDependent()) {
5552     QualType LHSType = TheCall->getArg(0)->getType();
5553     QualType RHSType = TheCall->getArg(1)->getType();
5554 
5555     if (!LHSType->isVectorType() || !RHSType->isVectorType())
5556       return ExprError(
5557           Diag(TheCall->getBeginLoc(), diag::err_vec_builtin_non_vector)
5558           << TheCall->getDirectCallee()
5559           << SourceRange(TheCall->getArg(0)->getBeginLoc(),
5560                          TheCall->getArg(1)->getEndLoc()));
5561 
5562     numElements = LHSType->getAs<VectorType>()->getNumElements();
5563     unsigned numResElements = TheCall->getNumArgs() - 2;
5564 
5565     // Check to see if we have a call with 2 vector arguments, the unary shuffle
5566     // with mask.  If so, verify that RHS is an integer vector type with the
5567     // same number of elts as lhs.
5568     if (TheCall->getNumArgs() == 2) {
5569       if (!RHSType->hasIntegerRepresentation() ||
5570           RHSType->getAs<VectorType>()->getNumElements() != numElements)
5571         return ExprError(Diag(TheCall->getBeginLoc(),
5572                               diag::err_vec_builtin_incompatible_vector)
5573                          << TheCall->getDirectCallee()
5574                          << SourceRange(TheCall->getArg(1)->getBeginLoc(),
5575                                         TheCall->getArg(1)->getEndLoc()));
5576     } else if (!Context.hasSameUnqualifiedType(LHSType, RHSType)) {
5577       return ExprError(Diag(TheCall->getBeginLoc(),
5578                             diag::err_vec_builtin_incompatible_vector)
5579                        << TheCall->getDirectCallee()
5580                        << SourceRange(TheCall->getArg(0)->getBeginLoc(),
5581                                       TheCall->getArg(1)->getEndLoc()));
5582     } else if (numElements != numResElements) {
5583       QualType eltType = LHSType->getAs<VectorType>()->getElementType();
5584       resType = Context.getVectorType(eltType, numResElements,
5585                                       VectorType::GenericVector);
5586     }
5587   }
5588 
5589   for (unsigned i = 2; i < TheCall->getNumArgs(); i++) {
5590     if (TheCall->getArg(i)->isTypeDependent() ||
5591         TheCall->getArg(i)->isValueDependent())
5592       continue;
5593 
5594     llvm::APSInt Result(32);
5595     if (!TheCall->getArg(i)->isIntegerConstantExpr(Result, Context))
5596       return ExprError(Diag(TheCall->getBeginLoc(),
5597                             diag::err_shufflevector_nonconstant_argument)
5598                        << TheCall->getArg(i)->getSourceRange());
5599 
5600     // Allow -1 which will be translated to undef in the IR.
5601     if (Result.isSigned() && Result.isAllOnesValue())
5602       continue;
5603 
5604     if (Result.getActiveBits() > 64 || Result.getZExtValue() >= numElements*2)
5605       return ExprError(Diag(TheCall->getBeginLoc(),
5606                             diag::err_shufflevector_argument_too_large)
5607                        << TheCall->getArg(i)->getSourceRange());
5608   }
5609 
5610   SmallVector<Expr*, 32> exprs;
5611 
5612   for (unsigned i = 0, e = TheCall->getNumArgs(); i != e; i++) {
5613     exprs.push_back(TheCall->getArg(i));
5614     TheCall->setArg(i, nullptr);
5615   }
5616 
5617   return new (Context) ShuffleVectorExpr(Context, exprs, resType,
5618                                          TheCall->getCallee()->getBeginLoc(),
5619                                          TheCall->getRParenLoc());
5620 }
5621 
5622 /// SemaConvertVectorExpr - Handle __builtin_convertvector
5623 ExprResult Sema::SemaConvertVectorExpr(Expr *E, TypeSourceInfo *TInfo,
5624                                        SourceLocation BuiltinLoc,
5625                                        SourceLocation RParenLoc) {
5626   ExprValueKind VK = VK_RValue;
5627   ExprObjectKind OK = OK_Ordinary;
5628   QualType DstTy = TInfo->getType();
5629   QualType SrcTy = E->getType();
5630 
5631   if (!SrcTy->isVectorType() && !SrcTy->isDependentType())
5632     return ExprError(Diag(BuiltinLoc,
5633                           diag::err_convertvector_non_vector)
5634                      << E->getSourceRange());
5635   if (!DstTy->isVectorType() && !DstTy->isDependentType())
5636     return ExprError(Diag(BuiltinLoc,
5637                           diag::err_convertvector_non_vector_type));
5638 
5639   if (!SrcTy->isDependentType() && !DstTy->isDependentType()) {
5640     unsigned SrcElts = SrcTy->getAs<VectorType>()->getNumElements();
5641     unsigned DstElts = DstTy->getAs<VectorType>()->getNumElements();
5642     if (SrcElts != DstElts)
5643       return ExprError(Diag(BuiltinLoc,
5644                             diag::err_convertvector_incompatible_vector)
5645                        << E->getSourceRange());
5646   }
5647 
5648   return new (Context)
5649       ConvertVectorExpr(E, TInfo, DstTy, VK, OK, BuiltinLoc, RParenLoc);
5650 }
5651 
5652 /// SemaBuiltinPrefetch - Handle __builtin_prefetch.
5653 // This is declared to take (const void*, ...) and can take two
5654 // optional constant int args.
5655 bool Sema::SemaBuiltinPrefetch(CallExpr *TheCall) {
5656   unsigned NumArgs = TheCall->getNumArgs();
5657 
5658   if (NumArgs > 3)
5659     return Diag(TheCall->getEndLoc(),
5660                 diag::err_typecheck_call_too_many_args_at_most)
5661            << 0 /*function call*/ << 3 << NumArgs << TheCall->getSourceRange();
5662 
5663   // Argument 0 is checked for us and the remaining arguments must be
5664   // constant integers.
5665   for (unsigned i = 1; i != NumArgs; ++i)
5666     if (SemaBuiltinConstantArgRange(TheCall, i, 0, i == 1 ? 1 : 3))
5667       return true;
5668 
5669   return false;
5670 }
5671 
5672 /// SemaBuiltinAssume - Handle __assume (MS Extension).
5673 // __assume does not evaluate its arguments, and should warn if its argument
5674 // has side effects.
5675 bool Sema::SemaBuiltinAssume(CallExpr *TheCall) {
5676   Expr *Arg = TheCall->getArg(0);
5677   if (Arg->isInstantiationDependent()) return false;
5678 
5679   if (Arg->HasSideEffects(Context))
5680     Diag(Arg->getBeginLoc(), diag::warn_assume_side_effects)
5681         << Arg->getSourceRange()
5682         << cast<FunctionDecl>(TheCall->getCalleeDecl())->getIdentifier();
5683 
5684   return false;
5685 }
5686 
5687 /// Handle __builtin_alloca_with_align. This is declared
5688 /// as (size_t, size_t) where the second size_t must be a power of 2 greater
5689 /// than 8.
5690 bool Sema::SemaBuiltinAllocaWithAlign(CallExpr *TheCall) {
5691   // The alignment must be a constant integer.
5692   Expr *Arg = TheCall->getArg(1);
5693 
5694   // We can't check the value of a dependent argument.
5695   if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
5696     if (const auto *UE =
5697             dyn_cast<UnaryExprOrTypeTraitExpr>(Arg->IgnoreParenImpCasts()))
5698       if (UE->getKind() == UETT_AlignOf)
5699         Diag(TheCall->getBeginLoc(), diag::warn_alloca_align_alignof)
5700             << Arg->getSourceRange();
5701 
5702     llvm::APSInt Result = Arg->EvaluateKnownConstInt(Context);
5703 
5704     if (!Result.isPowerOf2())
5705       return Diag(TheCall->getBeginLoc(), diag::err_alignment_not_power_of_two)
5706              << Arg->getSourceRange();
5707 
5708     if (Result < Context.getCharWidth())
5709       return Diag(TheCall->getBeginLoc(), diag::err_alignment_too_small)
5710              << (unsigned)Context.getCharWidth() << Arg->getSourceRange();
5711 
5712     if (Result > std::numeric_limits<int32_t>::max())
5713       return Diag(TheCall->getBeginLoc(), diag::err_alignment_too_big)
5714              << std::numeric_limits<int32_t>::max() << Arg->getSourceRange();
5715   }
5716 
5717   return false;
5718 }
5719 
5720 /// Handle __builtin_assume_aligned. This is declared
5721 /// as (const void*, size_t, ...) and can take one optional constant int arg.
5722 bool Sema::SemaBuiltinAssumeAligned(CallExpr *TheCall) {
5723   unsigned NumArgs = TheCall->getNumArgs();
5724 
5725   if (NumArgs > 3)
5726     return Diag(TheCall->getEndLoc(),
5727                 diag::err_typecheck_call_too_many_args_at_most)
5728            << 0 /*function call*/ << 3 << NumArgs << TheCall->getSourceRange();
5729 
5730   // The alignment must be a constant integer.
5731   Expr *Arg = TheCall->getArg(1);
5732 
5733   // We can't check the value of a dependent argument.
5734   if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
5735     llvm::APSInt Result;
5736     if (SemaBuiltinConstantArg(TheCall, 1, Result))
5737       return true;
5738 
5739     if (!Result.isPowerOf2())
5740       return Diag(TheCall->getBeginLoc(), diag::err_alignment_not_power_of_two)
5741              << Arg->getSourceRange();
5742   }
5743 
5744   if (NumArgs > 2) {
5745     ExprResult Arg(TheCall->getArg(2));
5746     InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
5747       Context.getSizeType(), false);
5748     Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
5749     if (Arg.isInvalid()) return true;
5750     TheCall->setArg(2, Arg.get());
5751   }
5752 
5753   return false;
5754 }
5755 
5756 bool Sema::SemaBuiltinOSLogFormat(CallExpr *TheCall) {
5757   unsigned BuiltinID =
5758       cast<FunctionDecl>(TheCall->getCalleeDecl())->getBuiltinID();
5759   bool IsSizeCall = BuiltinID == Builtin::BI__builtin_os_log_format_buffer_size;
5760 
5761   unsigned NumArgs = TheCall->getNumArgs();
5762   unsigned NumRequiredArgs = IsSizeCall ? 1 : 2;
5763   if (NumArgs < NumRequiredArgs) {
5764     return Diag(TheCall->getEndLoc(), diag::err_typecheck_call_too_few_args)
5765            << 0 /* function call */ << NumRequiredArgs << NumArgs
5766            << TheCall->getSourceRange();
5767   }
5768   if (NumArgs >= NumRequiredArgs + 0x100) {
5769     return Diag(TheCall->getEndLoc(),
5770                 diag::err_typecheck_call_too_many_args_at_most)
5771            << 0 /* function call */ << (NumRequiredArgs + 0xff) << NumArgs
5772            << TheCall->getSourceRange();
5773   }
5774   unsigned i = 0;
5775 
5776   // For formatting call, check buffer arg.
5777   if (!IsSizeCall) {
5778     ExprResult Arg(TheCall->getArg(i));
5779     InitializedEntity Entity = InitializedEntity::InitializeParameter(
5780         Context, Context.VoidPtrTy, false);
5781     Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
5782     if (Arg.isInvalid())
5783       return true;
5784     TheCall->setArg(i, Arg.get());
5785     i++;
5786   }
5787 
5788   // Check string literal arg.
5789   unsigned FormatIdx = i;
5790   {
5791     ExprResult Arg = CheckOSLogFormatStringArg(TheCall->getArg(i));
5792     if (Arg.isInvalid())
5793       return true;
5794     TheCall->setArg(i, Arg.get());
5795     i++;
5796   }
5797 
5798   // Make sure variadic args are scalar.
5799   unsigned FirstDataArg = i;
5800   while (i < NumArgs) {
5801     ExprResult Arg = DefaultVariadicArgumentPromotion(
5802         TheCall->getArg(i), VariadicFunction, nullptr);
5803     if (Arg.isInvalid())
5804       return true;
5805     CharUnits ArgSize = Context.getTypeSizeInChars(Arg.get()->getType());
5806     if (ArgSize.getQuantity() >= 0x100) {
5807       return Diag(Arg.get()->getEndLoc(), diag::err_os_log_argument_too_big)
5808              << i << (int)ArgSize.getQuantity() << 0xff
5809              << TheCall->getSourceRange();
5810     }
5811     TheCall->setArg(i, Arg.get());
5812     i++;
5813   }
5814 
5815   // Check formatting specifiers. NOTE: We're only doing this for the non-size
5816   // call to avoid duplicate diagnostics.
5817   if (!IsSizeCall) {
5818     llvm::SmallBitVector CheckedVarArgs(NumArgs, false);
5819     ArrayRef<const Expr *> Args(TheCall->getArgs(), TheCall->getNumArgs());
5820     bool Success = CheckFormatArguments(
5821         Args, /*HasVAListArg*/ false, FormatIdx, FirstDataArg, FST_OSLog,
5822         VariadicFunction, TheCall->getBeginLoc(), SourceRange(),
5823         CheckedVarArgs);
5824     if (!Success)
5825       return true;
5826   }
5827 
5828   if (IsSizeCall) {
5829     TheCall->setType(Context.getSizeType());
5830   } else {
5831     TheCall->setType(Context.VoidPtrTy);
5832   }
5833   return false;
5834 }
5835 
5836 /// SemaBuiltinConstantArg - Handle a check if argument ArgNum of CallExpr
5837 /// TheCall is a constant expression.
5838 bool Sema::SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum,
5839                                   llvm::APSInt &Result) {
5840   Expr *Arg = TheCall->getArg(ArgNum);
5841   DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
5842   FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
5843 
5844   if (Arg->isTypeDependent() || Arg->isValueDependent()) return false;
5845 
5846   if (!Arg->isIntegerConstantExpr(Result, Context))
5847     return Diag(TheCall->getBeginLoc(), diag::err_constant_integer_arg_type)
5848            << FDecl->getDeclName() << Arg->getSourceRange();
5849 
5850   return false;
5851 }
5852 
5853 /// SemaBuiltinConstantArgRange - Handle a check if argument ArgNum of CallExpr
5854 /// TheCall is a constant expression in the range [Low, High].
5855 bool Sema::SemaBuiltinConstantArgRange(CallExpr *TheCall, int ArgNum,
5856                                        int Low, int High, bool RangeIsError) {
5857   llvm::APSInt Result;
5858 
5859   // We can't check the value of a dependent argument.
5860   Expr *Arg = TheCall->getArg(ArgNum);
5861   if (Arg->isTypeDependent() || Arg->isValueDependent())
5862     return false;
5863 
5864   // Check constant-ness first.
5865   if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
5866     return true;
5867 
5868   if (Result.getSExtValue() < Low || Result.getSExtValue() > High) {
5869     if (RangeIsError)
5870       return Diag(TheCall->getBeginLoc(), diag::err_argument_invalid_range)
5871              << Result.toString(10) << Low << High << Arg->getSourceRange();
5872     else
5873       // Defer the warning until we know if the code will be emitted so that
5874       // dead code can ignore this.
5875       DiagRuntimeBehavior(TheCall->getBeginLoc(), TheCall,
5876                           PDiag(diag::warn_argument_invalid_range)
5877                               << Result.toString(10) << Low << High
5878                               << Arg->getSourceRange());
5879   }
5880 
5881   return false;
5882 }
5883 
5884 /// SemaBuiltinConstantArgMultiple - Handle a check if argument ArgNum of CallExpr
5885 /// TheCall is a constant expression is a multiple of Num..
5886 bool Sema::SemaBuiltinConstantArgMultiple(CallExpr *TheCall, int ArgNum,
5887                                           unsigned Num) {
5888   llvm::APSInt Result;
5889 
5890   // We can't check the value of a dependent argument.
5891   Expr *Arg = TheCall->getArg(ArgNum);
5892   if (Arg->isTypeDependent() || Arg->isValueDependent())
5893     return false;
5894 
5895   // Check constant-ness first.
5896   if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
5897     return true;
5898 
5899   if (Result.getSExtValue() % Num != 0)
5900     return Diag(TheCall->getBeginLoc(), diag::err_argument_not_multiple)
5901            << Num << Arg->getSourceRange();
5902 
5903   return false;
5904 }
5905 
5906 /// SemaBuiltinARMSpecialReg - Handle a check if argument ArgNum of CallExpr
5907 /// TheCall is an ARM/AArch64 special register string literal.
5908 bool Sema::SemaBuiltinARMSpecialReg(unsigned BuiltinID, CallExpr *TheCall,
5909                                     int ArgNum, unsigned ExpectedFieldNum,
5910                                     bool AllowName) {
5911   bool IsARMBuiltin = BuiltinID == ARM::BI__builtin_arm_rsr64 ||
5912                       BuiltinID == ARM::BI__builtin_arm_wsr64 ||
5913                       BuiltinID == ARM::BI__builtin_arm_rsr ||
5914                       BuiltinID == ARM::BI__builtin_arm_rsrp ||
5915                       BuiltinID == ARM::BI__builtin_arm_wsr ||
5916                       BuiltinID == ARM::BI__builtin_arm_wsrp;
5917   bool IsAArch64Builtin = BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
5918                           BuiltinID == AArch64::BI__builtin_arm_wsr64 ||
5919                           BuiltinID == AArch64::BI__builtin_arm_rsr ||
5920                           BuiltinID == AArch64::BI__builtin_arm_rsrp ||
5921                           BuiltinID == AArch64::BI__builtin_arm_wsr ||
5922                           BuiltinID == AArch64::BI__builtin_arm_wsrp;
5923   assert((IsARMBuiltin || IsAArch64Builtin) && "Unexpected ARM builtin.");
5924 
5925   // We can't check the value of a dependent argument.
5926   Expr *Arg = TheCall->getArg(ArgNum);
5927   if (Arg->isTypeDependent() || Arg->isValueDependent())
5928     return false;
5929 
5930   // Check if the argument is a string literal.
5931   if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
5932     return Diag(TheCall->getBeginLoc(), diag::err_expr_not_string_literal)
5933            << Arg->getSourceRange();
5934 
5935   // Check the type of special register given.
5936   StringRef Reg = cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
5937   SmallVector<StringRef, 6> Fields;
5938   Reg.split(Fields, ":");
5939 
5940   if (Fields.size() != ExpectedFieldNum && !(AllowName && Fields.size() == 1))
5941     return Diag(TheCall->getBeginLoc(), diag::err_arm_invalid_specialreg)
5942            << Arg->getSourceRange();
5943 
5944   // If the string is the name of a register then we cannot check that it is
5945   // valid here but if the string is of one the forms described in ACLE then we
5946   // can check that the supplied fields are integers and within the valid
5947   // ranges.
5948   if (Fields.size() > 1) {
5949     bool FiveFields = Fields.size() == 5;
5950 
5951     bool ValidString = true;
5952     if (IsARMBuiltin) {
5953       ValidString &= Fields[0].startswith_lower("cp") ||
5954                      Fields[0].startswith_lower("p");
5955       if (ValidString)
5956         Fields[0] =
5957           Fields[0].drop_front(Fields[0].startswith_lower("cp") ? 2 : 1);
5958 
5959       ValidString &= Fields[2].startswith_lower("c");
5960       if (ValidString)
5961         Fields[2] = Fields[2].drop_front(1);
5962 
5963       if (FiveFields) {
5964         ValidString &= Fields[3].startswith_lower("c");
5965         if (ValidString)
5966           Fields[3] = Fields[3].drop_front(1);
5967       }
5968     }
5969 
5970     SmallVector<int, 5> Ranges;
5971     if (FiveFields)
5972       Ranges.append({IsAArch64Builtin ? 1 : 15, 7, 15, 15, 7});
5973     else
5974       Ranges.append({15, 7, 15});
5975 
5976     for (unsigned i=0; i<Fields.size(); ++i) {
5977       int IntField;
5978       ValidString &= !Fields[i].getAsInteger(10, IntField);
5979       ValidString &= (IntField >= 0 && IntField <= Ranges[i]);
5980     }
5981 
5982     if (!ValidString)
5983       return Diag(TheCall->getBeginLoc(), diag::err_arm_invalid_specialreg)
5984              << Arg->getSourceRange();
5985   } else if (IsAArch64Builtin && Fields.size() == 1) {
5986     // If the register name is one of those that appear in the condition below
5987     // and the special register builtin being used is one of the write builtins,
5988     // then we require that the argument provided for writing to the register
5989     // is an integer constant expression. This is because it will be lowered to
5990     // an MSR (immediate) instruction, so we need to know the immediate at
5991     // compile time.
5992     if (TheCall->getNumArgs() != 2)
5993       return false;
5994 
5995     std::string RegLower = Reg.lower();
5996     if (RegLower != "spsel" && RegLower != "daifset" && RegLower != "daifclr" &&
5997         RegLower != "pan" && RegLower != "uao")
5998       return false;
5999 
6000     return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
6001   }
6002 
6003   return false;
6004 }
6005 
6006 /// SemaBuiltinLongjmp - Handle __builtin_longjmp(void *env[5], int val).
6007 /// This checks that the target supports __builtin_longjmp and
6008 /// that val is a constant 1.
6009 bool Sema::SemaBuiltinLongjmp(CallExpr *TheCall) {
6010   if (!Context.getTargetInfo().hasSjLjLowering())
6011     return Diag(TheCall->getBeginLoc(), diag::err_builtin_longjmp_unsupported)
6012            << SourceRange(TheCall->getBeginLoc(), TheCall->getEndLoc());
6013 
6014   Expr *Arg = TheCall->getArg(1);
6015   llvm::APSInt Result;
6016 
6017   // TODO: This is less than ideal. Overload this to take a value.
6018   if (SemaBuiltinConstantArg(TheCall, 1, Result))
6019     return true;
6020 
6021   if (Result != 1)
6022     return Diag(TheCall->getBeginLoc(), diag::err_builtin_longjmp_invalid_val)
6023            << SourceRange(Arg->getBeginLoc(), Arg->getEndLoc());
6024 
6025   return false;
6026 }
6027 
6028 /// SemaBuiltinSetjmp - Handle __builtin_setjmp(void *env[5]).
6029 /// This checks that the target supports __builtin_setjmp.
6030 bool Sema::SemaBuiltinSetjmp(CallExpr *TheCall) {
6031   if (!Context.getTargetInfo().hasSjLjLowering())
6032     return Diag(TheCall->getBeginLoc(), diag::err_builtin_setjmp_unsupported)
6033            << SourceRange(TheCall->getBeginLoc(), TheCall->getEndLoc());
6034   return false;
6035 }
6036 
6037 namespace {
6038 
6039 class UncoveredArgHandler {
6040   enum { Unknown = -1, AllCovered = -2 };
6041 
6042   signed FirstUncoveredArg = Unknown;
6043   SmallVector<const Expr *, 4> DiagnosticExprs;
6044 
6045 public:
6046   UncoveredArgHandler() = default;
6047 
6048   bool hasUncoveredArg() const {
6049     return (FirstUncoveredArg >= 0);
6050   }
6051 
6052   unsigned getUncoveredArg() const {
6053     assert(hasUncoveredArg() && "no uncovered argument");
6054     return FirstUncoveredArg;
6055   }
6056 
6057   void setAllCovered() {
6058     // A string has been found with all arguments covered, so clear out
6059     // the diagnostics.
6060     DiagnosticExprs.clear();
6061     FirstUncoveredArg = AllCovered;
6062   }
6063 
6064   void Update(signed NewFirstUncoveredArg, const Expr *StrExpr) {
6065     assert(NewFirstUncoveredArg >= 0 && "Outside range");
6066 
6067     // Don't update if a previous string covers all arguments.
6068     if (FirstUncoveredArg == AllCovered)
6069       return;
6070 
6071     // UncoveredArgHandler tracks the highest uncovered argument index
6072     // and with it all the strings that match this index.
6073     if (NewFirstUncoveredArg == FirstUncoveredArg)
6074       DiagnosticExprs.push_back(StrExpr);
6075     else if (NewFirstUncoveredArg > FirstUncoveredArg) {
6076       DiagnosticExprs.clear();
6077       DiagnosticExprs.push_back(StrExpr);
6078       FirstUncoveredArg = NewFirstUncoveredArg;
6079     }
6080   }
6081 
6082   void Diagnose(Sema &S, bool IsFunctionCall, const Expr *ArgExpr);
6083 };
6084 
6085 enum StringLiteralCheckType {
6086   SLCT_NotALiteral,
6087   SLCT_UncheckedLiteral,
6088   SLCT_CheckedLiteral
6089 };
6090 
6091 } // namespace
6092 
6093 static void sumOffsets(llvm::APSInt &Offset, llvm::APSInt Addend,
6094                                      BinaryOperatorKind BinOpKind,
6095                                      bool AddendIsRight) {
6096   unsigned BitWidth = Offset.getBitWidth();
6097   unsigned AddendBitWidth = Addend.getBitWidth();
6098   // There might be negative interim results.
6099   if (Addend.isUnsigned()) {
6100     Addend = Addend.zext(++AddendBitWidth);
6101     Addend.setIsSigned(true);
6102   }
6103   // Adjust the bit width of the APSInts.
6104   if (AddendBitWidth > BitWidth) {
6105     Offset = Offset.sext(AddendBitWidth);
6106     BitWidth = AddendBitWidth;
6107   } else if (BitWidth > AddendBitWidth) {
6108     Addend = Addend.sext(BitWidth);
6109   }
6110 
6111   bool Ov = false;
6112   llvm::APSInt ResOffset = Offset;
6113   if (BinOpKind == BO_Add)
6114     ResOffset = Offset.sadd_ov(Addend, Ov);
6115   else {
6116     assert(AddendIsRight && BinOpKind == BO_Sub &&
6117            "operator must be add or sub with addend on the right");
6118     ResOffset = Offset.ssub_ov(Addend, Ov);
6119   }
6120 
6121   // We add an offset to a pointer here so we should support an offset as big as
6122   // possible.
6123   if (Ov) {
6124     assert(BitWidth <= std::numeric_limits<unsigned>::max() / 2 &&
6125            "index (intermediate) result too big");
6126     Offset = Offset.sext(2 * BitWidth);
6127     sumOffsets(Offset, Addend, BinOpKind, AddendIsRight);
6128     return;
6129   }
6130 
6131   Offset = ResOffset;
6132 }
6133 
6134 namespace {
6135 
6136 // This is a wrapper class around StringLiteral to support offsetted string
6137 // literals as format strings. It takes the offset into account when returning
6138 // the string and its length or the source locations to display notes correctly.
6139 class FormatStringLiteral {
6140   const StringLiteral *FExpr;
6141   int64_t Offset;
6142 
6143  public:
6144   FormatStringLiteral(const StringLiteral *fexpr, int64_t Offset = 0)
6145       : FExpr(fexpr), Offset(Offset) {}
6146 
6147   StringRef getString() const {
6148     return FExpr->getString().drop_front(Offset);
6149   }
6150 
6151   unsigned getByteLength() const {
6152     return FExpr->getByteLength() - getCharByteWidth() * Offset;
6153   }
6154 
6155   unsigned getLength() const { return FExpr->getLength() - Offset; }
6156   unsigned getCharByteWidth() const { return FExpr->getCharByteWidth(); }
6157 
6158   StringLiteral::StringKind getKind() const { return FExpr->getKind(); }
6159 
6160   QualType getType() const { return FExpr->getType(); }
6161 
6162   bool isAscii() const { return FExpr->isAscii(); }
6163   bool isWide() const { return FExpr->isWide(); }
6164   bool isUTF8() const { return FExpr->isUTF8(); }
6165   bool isUTF16() const { return FExpr->isUTF16(); }
6166   bool isUTF32() const { return FExpr->isUTF32(); }
6167   bool isPascal() const { return FExpr->isPascal(); }
6168 
6169   SourceLocation getLocationOfByte(
6170       unsigned ByteNo, const SourceManager &SM, const LangOptions &Features,
6171       const TargetInfo &Target, unsigned *StartToken = nullptr,
6172       unsigned *StartTokenByteOffset = nullptr) const {
6173     return FExpr->getLocationOfByte(ByteNo + Offset, SM, Features, Target,
6174                                     StartToken, StartTokenByteOffset);
6175   }
6176 
6177   SourceLocation getBeginLoc() const LLVM_READONLY {
6178     return FExpr->getBeginLoc().getLocWithOffset(Offset);
6179   }
6180 
6181   SourceLocation getEndLoc() const LLVM_READONLY { return FExpr->getEndLoc(); }
6182 };
6183 
6184 }  // namespace
6185 
6186 static void CheckFormatString(Sema &S, const FormatStringLiteral *FExpr,
6187                               const Expr *OrigFormatExpr,
6188                               ArrayRef<const Expr *> Args,
6189                               bool HasVAListArg, unsigned format_idx,
6190                               unsigned firstDataArg,
6191                               Sema::FormatStringType Type,
6192                               bool inFunctionCall,
6193                               Sema::VariadicCallType CallType,
6194                               llvm::SmallBitVector &CheckedVarArgs,
6195                               UncoveredArgHandler &UncoveredArg);
6196 
6197 // Determine if an expression is a string literal or constant string.
6198 // If this function returns false on the arguments to a function expecting a
6199 // format string, we will usually need to emit a warning.
6200 // True string literals are then checked by CheckFormatString.
6201 static StringLiteralCheckType
6202 checkFormatStringExpr(Sema &S, const Expr *E, ArrayRef<const Expr *> Args,
6203                       bool HasVAListArg, unsigned format_idx,
6204                       unsigned firstDataArg, Sema::FormatStringType Type,
6205                       Sema::VariadicCallType CallType, bool InFunctionCall,
6206                       llvm::SmallBitVector &CheckedVarArgs,
6207                       UncoveredArgHandler &UncoveredArg,
6208                       llvm::APSInt Offset) {
6209  tryAgain:
6210   assert(Offset.isSigned() && "invalid offset");
6211 
6212   if (E->isTypeDependent() || E->isValueDependent())
6213     return SLCT_NotALiteral;
6214 
6215   E = E->IgnoreParenCasts();
6216 
6217   if (E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull))
6218     // Technically -Wformat-nonliteral does not warn about this case.
6219     // The behavior of printf and friends in this case is implementation
6220     // dependent.  Ideally if the format string cannot be null then
6221     // it should have a 'nonnull' attribute in the function prototype.
6222     return SLCT_UncheckedLiteral;
6223 
6224   switch (E->getStmtClass()) {
6225   case Stmt::BinaryConditionalOperatorClass:
6226   case Stmt::ConditionalOperatorClass: {
6227     // The expression is a literal if both sub-expressions were, and it was
6228     // completely checked only if both sub-expressions were checked.
6229     const AbstractConditionalOperator *C =
6230         cast<AbstractConditionalOperator>(E);
6231 
6232     // Determine whether it is necessary to check both sub-expressions, for
6233     // example, because the condition expression is a constant that can be
6234     // evaluated at compile time.
6235     bool CheckLeft = true, CheckRight = true;
6236 
6237     bool Cond;
6238     if (C->getCond()->EvaluateAsBooleanCondition(Cond, S.getASTContext())) {
6239       if (Cond)
6240         CheckRight = false;
6241       else
6242         CheckLeft = false;
6243     }
6244 
6245     // We need to maintain the offsets for the right and the left hand side
6246     // separately to check if every possible indexed expression is a valid
6247     // string literal. They might have different offsets for different string
6248     // literals in the end.
6249     StringLiteralCheckType Left;
6250     if (!CheckLeft)
6251       Left = SLCT_UncheckedLiteral;
6252     else {
6253       Left = checkFormatStringExpr(S, C->getTrueExpr(), Args,
6254                                    HasVAListArg, format_idx, firstDataArg,
6255                                    Type, CallType, InFunctionCall,
6256                                    CheckedVarArgs, UncoveredArg, Offset);
6257       if (Left == SLCT_NotALiteral || !CheckRight) {
6258         return Left;
6259       }
6260     }
6261 
6262     StringLiteralCheckType Right =
6263         checkFormatStringExpr(S, C->getFalseExpr(), Args,
6264                               HasVAListArg, format_idx, firstDataArg,
6265                               Type, CallType, InFunctionCall, CheckedVarArgs,
6266                               UncoveredArg, Offset);
6267 
6268     return (CheckLeft && Left < Right) ? Left : Right;
6269   }
6270 
6271   case Stmt::ImplicitCastExprClass:
6272     E = cast<ImplicitCastExpr>(E)->getSubExpr();
6273     goto tryAgain;
6274 
6275   case Stmt::OpaqueValueExprClass:
6276     if (const Expr *src = cast<OpaqueValueExpr>(E)->getSourceExpr()) {
6277       E = src;
6278       goto tryAgain;
6279     }
6280     return SLCT_NotALiteral;
6281 
6282   case Stmt::PredefinedExprClass:
6283     // While __func__, etc., are technically not string literals, they
6284     // cannot contain format specifiers and thus are not a security
6285     // liability.
6286     return SLCT_UncheckedLiteral;
6287 
6288   case Stmt::DeclRefExprClass: {
6289     const DeclRefExpr *DR = cast<DeclRefExpr>(E);
6290 
6291     // As an exception, do not flag errors for variables binding to
6292     // const string literals.
6293     if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) {
6294       bool isConstant = false;
6295       QualType T = DR->getType();
6296 
6297       if (const ArrayType *AT = S.Context.getAsArrayType(T)) {
6298         isConstant = AT->getElementType().isConstant(S.Context);
6299       } else if (const PointerType *PT = T->getAs<PointerType>()) {
6300         isConstant = T.isConstant(S.Context) &&
6301                      PT->getPointeeType().isConstant(S.Context);
6302       } else if (T->isObjCObjectPointerType()) {
6303         // In ObjC, there is usually no "const ObjectPointer" type,
6304         // so don't check if the pointee type is constant.
6305         isConstant = T.isConstant(S.Context);
6306       }
6307 
6308       if (isConstant) {
6309         if (const Expr *Init = VD->getAnyInitializer()) {
6310           // Look through initializers like const char c[] = { "foo" }
6311           if (const InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
6312             if (InitList->isStringLiteralInit())
6313               Init = InitList->getInit(0)->IgnoreParenImpCasts();
6314           }
6315           return checkFormatStringExpr(S, Init, Args,
6316                                        HasVAListArg, format_idx,
6317                                        firstDataArg, Type, CallType,
6318                                        /*InFunctionCall*/ false, CheckedVarArgs,
6319                                        UncoveredArg, Offset);
6320         }
6321       }
6322 
6323       // For vprintf* functions (i.e., HasVAListArg==true), we add a
6324       // special check to see if the format string is a function parameter
6325       // of the function calling the printf function.  If the function
6326       // has an attribute indicating it is a printf-like function, then we
6327       // should suppress warnings concerning non-literals being used in a call
6328       // to a vprintf function.  For example:
6329       //
6330       // void
6331       // logmessage(char const *fmt __attribute__ (format (printf, 1, 2)), ...){
6332       //      va_list ap;
6333       //      va_start(ap, fmt);
6334       //      vprintf(fmt, ap);  // Do NOT emit a warning about "fmt".
6335       //      ...
6336       // }
6337       if (HasVAListArg) {
6338         if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(VD)) {
6339           if (const NamedDecl *ND = dyn_cast<NamedDecl>(PV->getDeclContext())) {
6340             int PVIndex = PV->getFunctionScopeIndex() + 1;
6341             for (const auto *PVFormat : ND->specific_attrs<FormatAttr>()) {
6342               // adjust for implicit parameter
6343               if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
6344                 if (MD->isInstance())
6345                   ++PVIndex;
6346               // We also check if the formats are compatible.
6347               // We can't pass a 'scanf' string to a 'printf' function.
6348               if (PVIndex == PVFormat->getFormatIdx() &&
6349                   Type == S.GetFormatStringType(PVFormat))
6350                 return SLCT_UncheckedLiteral;
6351             }
6352           }
6353         }
6354       }
6355     }
6356 
6357     return SLCT_NotALiteral;
6358   }
6359 
6360   case Stmt::CallExprClass:
6361   case Stmt::CXXMemberCallExprClass: {
6362     const CallExpr *CE = cast<CallExpr>(E);
6363     if (const NamedDecl *ND = dyn_cast_or_null<NamedDecl>(CE->getCalleeDecl())) {
6364       bool IsFirst = true;
6365       StringLiteralCheckType CommonResult;
6366       for (const auto *FA : ND->specific_attrs<FormatArgAttr>()) {
6367         const Expr *Arg = CE->getArg(FA->getFormatIdx().getASTIndex());
6368         StringLiteralCheckType Result = checkFormatStringExpr(
6369             S, Arg, Args, HasVAListArg, format_idx, firstDataArg, Type,
6370             CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset);
6371         if (IsFirst) {
6372           CommonResult = Result;
6373           IsFirst = false;
6374         }
6375       }
6376       if (!IsFirst)
6377         return CommonResult;
6378 
6379       if (const auto *FD = dyn_cast<FunctionDecl>(ND)) {
6380         unsigned BuiltinID = FD->getBuiltinID();
6381         if (BuiltinID == Builtin::BI__builtin___CFStringMakeConstantString ||
6382             BuiltinID == Builtin::BI__builtin___NSStringMakeConstantString) {
6383           const Expr *Arg = CE->getArg(0);
6384           return checkFormatStringExpr(S, Arg, Args,
6385                                        HasVAListArg, format_idx,
6386                                        firstDataArg, Type, CallType,
6387                                        InFunctionCall, CheckedVarArgs,
6388                                        UncoveredArg, Offset);
6389         }
6390       }
6391     }
6392 
6393     return SLCT_NotALiteral;
6394   }
6395   case Stmt::ObjCMessageExprClass: {
6396     const auto *ME = cast<ObjCMessageExpr>(E);
6397     if (const auto *ND = ME->getMethodDecl()) {
6398       if (const auto *FA = ND->getAttr<FormatArgAttr>()) {
6399         const Expr *Arg = ME->getArg(FA->getFormatIdx().getASTIndex());
6400         return checkFormatStringExpr(
6401             S, Arg, Args, HasVAListArg, format_idx, firstDataArg, Type,
6402             CallType, InFunctionCall, CheckedVarArgs, UncoveredArg, Offset);
6403       }
6404     }
6405 
6406     return SLCT_NotALiteral;
6407   }
6408   case Stmt::ObjCStringLiteralClass:
6409   case Stmt::StringLiteralClass: {
6410     const StringLiteral *StrE = nullptr;
6411 
6412     if (const ObjCStringLiteral *ObjCFExpr = dyn_cast<ObjCStringLiteral>(E))
6413       StrE = ObjCFExpr->getString();
6414     else
6415       StrE = cast<StringLiteral>(E);
6416 
6417     if (StrE) {
6418       if (Offset.isNegative() || Offset > StrE->getLength()) {
6419         // TODO: It would be better to have an explicit warning for out of
6420         // bounds literals.
6421         return SLCT_NotALiteral;
6422       }
6423       FormatStringLiteral FStr(StrE, Offset.sextOrTrunc(64).getSExtValue());
6424       CheckFormatString(S, &FStr, E, Args, HasVAListArg, format_idx,
6425                         firstDataArg, Type, InFunctionCall, CallType,
6426                         CheckedVarArgs, UncoveredArg);
6427       return SLCT_CheckedLiteral;
6428     }
6429 
6430     return SLCT_NotALiteral;
6431   }
6432   case Stmt::BinaryOperatorClass: {
6433     llvm::APSInt LResult;
6434     llvm::APSInt RResult;
6435 
6436     const BinaryOperator *BinOp = cast<BinaryOperator>(E);
6437 
6438     // A string literal + an int offset is still a string literal.
6439     if (BinOp->isAdditiveOp()) {
6440       bool LIsInt = BinOp->getLHS()->EvaluateAsInt(LResult, S.Context);
6441       bool RIsInt = BinOp->getRHS()->EvaluateAsInt(RResult, S.Context);
6442 
6443       if (LIsInt != RIsInt) {
6444         BinaryOperatorKind BinOpKind = BinOp->getOpcode();
6445 
6446         if (LIsInt) {
6447           if (BinOpKind == BO_Add) {
6448             sumOffsets(Offset, LResult, BinOpKind, RIsInt);
6449             E = BinOp->getRHS();
6450             goto tryAgain;
6451           }
6452         } else {
6453           sumOffsets(Offset, RResult, BinOpKind, RIsInt);
6454           E = BinOp->getLHS();
6455           goto tryAgain;
6456         }
6457       }
6458     }
6459 
6460     return SLCT_NotALiteral;
6461   }
6462   case Stmt::UnaryOperatorClass: {
6463     const UnaryOperator *UnaOp = cast<UnaryOperator>(E);
6464     auto ASE = dyn_cast<ArraySubscriptExpr>(UnaOp->getSubExpr());
6465     if (UnaOp->getOpcode() == UO_AddrOf && ASE) {
6466       llvm::APSInt IndexResult;
6467       if (ASE->getRHS()->EvaluateAsInt(IndexResult, S.Context)) {
6468         sumOffsets(Offset, IndexResult, BO_Add, /*RHS is int*/ true);
6469         E = ASE->getBase();
6470         goto tryAgain;
6471       }
6472     }
6473 
6474     return SLCT_NotALiteral;
6475   }
6476 
6477   default:
6478     return SLCT_NotALiteral;
6479   }
6480 }
6481 
6482 Sema::FormatStringType Sema::GetFormatStringType(const FormatAttr *Format) {
6483   return llvm::StringSwitch<FormatStringType>(Format->getType()->getName())
6484       .Case("scanf", FST_Scanf)
6485       .Cases("printf", "printf0", FST_Printf)
6486       .Cases("NSString", "CFString", FST_NSString)
6487       .Case("strftime", FST_Strftime)
6488       .Case("strfmon", FST_Strfmon)
6489       .Cases("kprintf", "cmn_err", "vcmn_err", "zcmn_err", FST_Kprintf)
6490       .Case("freebsd_kprintf", FST_FreeBSDKPrintf)
6491       .Case("os_trace", FST_OSLog)
6492       .Case("os_log", FST_OSLog)
6493       .Default(FST_Unknown);
6494 }
6495 
6496 /// CheckFormatArguments - Check calls to printf and scanf (and similar
6497 /// functions) for correct use of format strings.
6498 /// Returns true if a format string has been fully checked.
6499 bool Sema::CheckFormatArguments(const FormatAttr *Format,
6500                                 ArrayRef<const Expr *> Args,
6501                                 bool IsCXXMember,
6502                                 VariadicCallType CallType,
6503                                 SourceLocation Loc, SourceRange Range,
6504                                 llvm::SmallBitVector &CheckedVarArgs) {
6505   FormatStringInfo FSI;
6506   if (getFormatStringInfo(Format, IsCXXMember, &FSI))
6507     return CheckFormatArguments(Args, FSI.HasVAListArg, FSI.FormatIdx,
6508                                 FSI.FirstDataArg, GetFormatStringType(Format),
6509                                 CallType, Loc, Range, CheckedVarArgs);
6510   return false;
6511 }
6512 
6513 bool Sema::CheckFormatArguments(ArrayRef<const Expr *> Args,
6514                                 bool HasVAListArg, unsigned format_idx,
6515                                 unsigned firstDataArg, FormatStringType Type,
6516                                 VariadicCallType CallType,
6517                                 SourceLocation Loc, SourceRange Range,
6518                                 llvm::SmallBitVector &CheckedVarArgs) {
6519   // CHECK: printf/scanf-like function is called with no format string.
6520   if (format_idx >= Args.size()) {
6521     Diag(Loc, diag::warn_missing_format_string) << Range;
6522     return false;
6523   }
6524 
6525   const Expr *OrigFormatExpr = Args[format_idx]->IgnoreParenCasts();
6526 
6527   // CHECK: format string is not a string literal.
6528   //
6529   // Dynamically generated format strings are difficult to
6530   // automatically vet at compile time.  Requiring that format strings
6531   // are string literals: (1) permits the checking of format strings by
6532   // the compiler and thereby (2) can practically remove the source of
6533   // many format string exploits.
6534 
6535   // Format string can be either ObjC string (e.g. @"%d") or
6536   // C string (e.g. "%d")
6537   // ObjC string uses the same format specifiers as C string, so we can use
6538   // the same format string checking logic for both ObjC and C strings.
6539   UncoveredArgHandler UncoveredArg;
6540   StringLiteralCheckType CT =
6541       checkFormatStringExpr(*this, OrigFormatExpr, Args, HasVAListArg,
6542                             format_idx, firstDataArg, Type, CallType,
6543                             /*IsFunctionCall*/ true, CheckedVarArgs,
6544                             UncoveredArg,
6545                             /*no string offset*/ llvm::APSInt(64, false) = 0);
6546 
6547   // Generate a diagnostic where an uncovered argument is detected.
6548   if (UncoveredArg.hasUncoveredArg()) {
6549     unsigned ArgIdx = UncoveredArg.getUncoveredArg() + firstDataArg;
6550     assert(ArgIdx < Args.size() && "ArgIdx outside bounds");
6551     UncoveredArg.Diagnose(*this, /*IsFunctionCall*/true, Args[ArgIdx]);
6552   }
6553 
6554   if (CT != SLCT_NotALiteral)
6555     // Literal format string found, check done!
6556     return CT == SLCT_CheckedLiteral;
6557 
6558   // Strftime is particular as it always uses a single 'time' argument,
6559   // so it is safe to pass a non-literal string.
6560   if (Type == FST_Strftime)
6561     return false;
6562 
6563   // Do not emit diag when the string param is a macro expansion and the
6564   // format is either NSString or CFString. This is a hack to prevent
6565   // diag when using the NSLocalizedString and CFCopyLocalizedString macros
6566   // which are usually used in place of NS and CF string literals.
6567   SourceLocation FormatLoc = Args[format_idx]->getBeginLoc();
6568   if (Type == FST_NSString && SourceMgr.isInSystemMacro(FormatLoc))
6569     return false;
6570 
6571   // If there are no arguments specified, warn with -Wformat-security, otherwise
6572   // warn only with -Wformat-nonliteral.
6573   if (Args.size() == firstDataArg) {
6574     Diag(FormatLoc, diag::warn_format_nonliteral_noargs)
6575       << OrigFormatExpr->getSourceRange();
6576     switch (Type) {
6577     default:
6578       break;
6579     case FST_Kprintf:
6580     case FST_FreeBSDKPrintf:
6581     case FST_Printf:
6582       Diag(FormatLoc, diag::note_format_security_fixit)
6583         << FixItHint::CreateInsertion(FormatLoc, "\"%s\", ");
6584       break;
6585     case FST_NSString:
6586       Diag(FormatLoc, diag::note_format_security_fixit)
6587         << FixItHint::CreateInsertion(FormatLoc, "@\"%@\", ");
6588       break;
6589     }
6590   } else {
6591     Diag(FormatLoc, diag::warn_format_nonliteral)
6592       << OrigFormatExpr->getSourceRange();
6593   }
6594   return false;
6595 }
6596 
6597 namespace {
6598 
6599 class CheckFormatHandler : public analyze_format_string::FormatStringHandler {
6600 protected:
6601   Sema &S;
6602   const FormatStringLiteral *FExpr;
6603   const Expr *OrigFormatExpr;
6604   const Sema::FormatStringType FSType;
6605   const unsigned FirstDataArg;
6606   const unsigned NumDataArgs;
6607   const char *Beg; // Start of format string.
6608   const bool HasVAListArg;
6609   ArrayRef<const Expr *> Args;
6610   unsigned FormatIdx;
6611   llvm::SmallBitVector CoveredArgs;
6612   bool usesPositionalArgs = false;
6613   bool atFirstArg = true;
6614   bool inFunctionCall;
6615   Sema::VariadicCallType CallType;
6616   llvm::SmallBitVector &CheckedVarArgs;
6617   UncoveredArgHandler &UncoveredArg;
6618 
6619 public:
6620   CheckFormatHandler(Sema &s, const FormatStringLiteral *fexpr,
6621                      const Expr *origFormatExpr,
6622                      const Sema::FormatStringType type, unsigned firstDataArg,
6623                      unsigned numDataArgs, const char *beg, bool hasVAListArg,
6624                      ArrayRef<const Expr *> Args, unsigned formatIdx,
6625                      bool inFunctionCall, Sema::VariadicCallType callType,
6626                      llvm::SmallBitVector &CheckedVarArgs,
6627                      UncoveredArgHandler &UncoveredArg)
6628       : S(s), FExpr(fexpr), OrigFormatExpr(origFormatExpr), FSType(type),
6629         FirstDataArg(firstDataArg), NumDataArgs(numDataArgs), Beg(beg),
6630         HasVAListArg(hasVAListArg), Args(Args), FormatIdx(formatIdx),
6631         inFunctionCall(inFunctionCall), CallType(callType),
6632         CheckedVarArgs(CheckedVarArgs), UncoveredArg(UncoveredArg) {
6633     CoveredArgs.resize(numDataArgs);
6634     CoveredArgs.reset();
6635   }
6636 
6637   void DoneProcessing();
6638 
6639   void HandleIncompleteSpecifier(const char *startSpecifier,
6640                                  unsigned specifierLen) override;
6641 
6642   void HandleInvalidLengthModifier(
6643                            const analyze_format_string::FormatSpecifier &FS,
6644                            const analyze_format_string::ConversionSpecifier &CS,
6645                            const char *startSpecifier, unsigned specifierLen,
6646                            unsigned DiagID);
6647 
6648   void HandleNonStandardLengthModifier(
6649                     const analyze_format_string::FormatSpecifier &FS,
6650                     const char *startSpecifier, unsigned specifierLen);
6651 
6652   void HandleNonStandardConversionSpecifier(
6653                     const analyze_format_string::ConversionSpecifier &CS,
6654                     const char *startSpecifier, unsigned specifierLen);
6655 
6656   void HandlePosition(const char *startPos, unsigned posLen) override;
6657 
6658   void HandleInvalidPosition(const char *startSpecifier,
6659                              unsigned specifierLen,
6660                              analyze_format_string::PositionContext p) override;
6661 
6662   void HandleZeroPosition(const char *startPos, unsigned posLen) override;
6663 
6664   void HandleNullChar(const char *nullCharacter) override;
6665 
6666   template <typename Range>
6667   static void
6668   EmitFormatDiagnostic(Sema &S, bool inFunctionCall, const Expr *ArgumentExpr,
6669                        const PartialDiagnostic &PDiag, SourceLocation StringLoc,
6670                        bool IsStringLocation, Range StringRange,
6671                        ArrayRef<FixItHint> Fixit = None);
6672 
6673 protected:
6674   bool HandleInvalidConversionSpecifier(unsigned argIndex, SourceLocation Loc,
6675                                         const char *startSpec,
6676                                         unsigned specifierLen,
6677                                         const char *csStart, unsigned csLen);
6678 
6679   void HandlePositionalNonpositionalArgs(SourceLocation Loc,
6680                                          const char *startSpec,
6681                                          unsigned specifierLen);
6682 
6683   SourceRange getFormatStringRange();
6684   CharSourceRange getSpecifierRange(const char *startSpecifier,
6685                                     unsigned specifierLen);
6686   SourceLocation getLocationOfByte(const char *x);
6687 
6688   const Expr *getDataArg(unsigned i) const;
6689 
6690   bool CheckNumArgs(const analyze_format_string::FormatSpecifier &FS,
6691                     const analyze_format_string::ConversionSpecifier &CS,
6692                     const char *startSpecifier, unsigned specifierLen,
6693                     unsigned argIndex);
6694 
6695   template <typename Range>
6696   void EmitFormatDiagnostic(PartialDiagnostic PDiag, SourceLocation StringLoc,
6697                             bool IsStringLocation, Range StringRange,
6698                             ArrayRef<FixItHint> Fixit = None);
6699 };
6700 
6701 } // namespace
6702 
6703 SourceRange CheckFormatHandler::getFormatStringRange() {
6704   return OrigFormatExpr->getSourceRange();
6705 }
6706 
6707 CharSourceRange CheckFormatHandler::
6708 getSpecifierRange(const char *startSpecifier, unsigned specifierLen) {
6709   SourceLocation Start = getLocationOfByte(startSpecifier);
6710   SourceLocation End   = getLocationOfByte(startSpecifier + specifierLen - 1);
6711 
6712   // Advance the end SourceLocation by one due to half-open ranges.
6713   End = End.getLocWithOffset(1);
6714 
6715   return CharSourceRange::getCharRange(Start, End);
6716 }
6717 
6718 SourceLocation CheckFormatHandler::getLocationOfByte(const char *x) {
6719   return FExpr->getLocationOfByte(x - Beg, S.getSourceManager(),
6720                                   S.getLangOpts(), S.Context.getTargetInfo());
6721 }
6722 
6723 void CheckFormatHandler::HandleIncompleteSpecifier(const char *startSpecifier,
6724                                                    unsigned specifierLen){
6725   EmitFormatDiagnostic(S.PDiag(diag::warn_printf_incomplete_specifier),
6726                        getLocationOfByte(startSpecifier),
6727                        /*IsStringLocation*/true,
6728                        getSpecifierRange(startSpecifier, specifierLen));
6729 }
6730 
6731 void CheckFormatHandler::HandleInvalidLengthModifier(
6732     const analyze_format_string::FormatSpecifier &FS,
6733     const analyze_format_string::ConversionSpecifier &CS,
6734     const char *startSpecifier, unsigned specifierLen, unsigned DiagID) {
6735   using namespace analyze_format_string;
6736 
6737   const LengthModifier &LM = FS.getLengthModifier();
6738   CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());
6739 
6740   // See if we know how to fix this length modifier.
6741   Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
6742   if (FixedLM) {
6743     EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
6744                          getLocationOfByte(LM.getStart()),
6745                          /*IsStringLocation*/true,
6746                          getSpecifierRange(startSpecifier, specifierLen));
6747 
6748     S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
6749       << FixedLM->toString()
6750       << FixItHint::CreateReplacement(LMRange, FixedLM->toString());
6751 
6752   } else {
6753     FixItHint Hint;
6754     if (DiagID == diag::warn_format_nonsensical_length)
6755       Hint = FixItHint::CreateRemoval(LMRange);
6756 
6757     EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
6758                          getLocationOfByte(LM.getStart()),
6759                          /*IsStringLocation*/true,
6760                          getSpecifierRange(startSpecifier, specifierLen),
6761                          Hint);
6762   }
6763 }
6764 
6765 void CheckFormatHandler::HandleNonStandardLengthModifier(
6766     const analyze_format_string::FormatSpecifier &FS,
6767     const char *startSpecifier, unsigned specifierLen) {
6768   using namespace analyze_format_string;
6769 
6770   const LengthModifier &LM = FS.getLengthModifier();
6771   CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());
6772 
6773   // See if we know how to fix this length modifier.
6774   Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
6775   if (FixedLM) {
6776     EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
6777                            << LM.toString() << 0,
6778                          getLocationOfByte(LM.getStart()),
6779                          /*IsStringLocation*/true,
6780                          getSpecifierRange(startSpecifier, specifierLen));
6781 
6782     S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
6783       << FixedLM->toString()
6784       << FixItHint::CreateReplacement(LMRange, FixedLM->toString());
6785 
6786   } else {
6787     EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
6788                            << LM.toString() << 0,
6789                          getLocationOfByte(LM.getStart()),
6790                          /*IsStringLocation*/true,
6791                          getSpecifierRange(startSpecifier, specifierLen));
6792   }
6793 }
6794 
6795 void CheckFormatHandler::HandleNonStandardConversionSpecifier(
6796     const analyze_format_string::ConversionSpecifier &CS,
6797     const char *startSpecifier, unsigned specifierLen) {
6798   using namespace analyze_format_string;
6799 
6800   // See if we know how to fix this conversion specifier.
6801   Optional<ConversionSpecifier> FixedCS = CS.getStandardSpecifier();
6802   if (FixedCS) {
6803     EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
6804                           << CS.toString() << /*conversion specifier*/1,
6805                          getLocationOfByte(CS.getStart()),
6806                          /*IsStringLocation*/true,
6807                          getSpecifierRange(startSpecifier, specifierLen));
6808 
6809     CharSourceRange CSRange = getSpecifierRange(CS.getStart(), CS.getLength());
6810     S.Diag(getLocationOfByte(CS.getStart()), diag::note_format_fix_specifier)
6811       << FixedCS->toString()
6812       << FixItHint::CreateReplacement(CSRange, FixedCS->toString());
6813   } else {
6814     EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
6815                           << CS.toString() << /*conversion specifier*/1,
6816                          getLocationOfByte(CS.getStart()),
6817                          /*IsStringLocation*/true,
6818                          getSpecifierRange(startSpecifier, specifierLen));
6819   }
6820 }
6821 
6822 void CheckFormatHandler::HandlePosition(const char *startPos,
6823                                         unsigned posLen) {
6824   EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard_positional_arg),
6825                                getLocationOfByte(startPos),
6826                                /*IsStringLocation*/true,
6827                                getSpecifierRange(startPos, posLen));
6828 }
6829 
6830 void
6831 CheckFormatHandler::HandleInvalidPosition(const char *startPos, unsigned posLen,
6832                                      analyze_format_string::PositionContext p) {
6833   EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_positional_specifier)
6834                          << (unsigned) p,
6835                        getLocationOfByte(startPos), /*IsStringLocation*/true,
6836                        getSpecifierRange(startPos, posLen));
6837 }
6838 
6839 void CheckFormatHandler::HandleZeroPosition(const char *startPos,
6840                                             unsigned posLen) {
6841   EmitFormatDiagnostic(S.PDiag(diag::warn_format_zero_positional_specifier),
6842                                getLocationOfByte(startPos),
6843                                /*IsStringLocation*/true,
6844                                getSpecifierRange(startPos, posLen));
6845 }
6846 
6847 void CheckFormatHandler::HandleNullChar(const char *nullCharacter) {
6848   if (!isa<ObjCStringLiteral>(OrigFormatExpr)) {
6849     // The presence of a null character is likely an error.
6850     EmitFormatDiagnostic(
6851       S.PDiag(diag::warn_printf_format_string_contains_null_char),
6852       getLocationOfByte(nullCharacter), /*IsStringLocation*/true,
6853       getFormatStringRange());
6854   }
6855 }
6856 
6857 // Note that this may return NULL if there was an error parsing or building
6858 // one of the argument expressions.
6859 const Expr *CheckFormatHandler::getDataArg(unsigned i) const {
6860   return Args[FirstDataArg + i];
6861 }
6862 
6863 void CheckFormatHandler::DoneProcessing() {
6864   // Does the number of data arguments exceed the number of
6865   // format conversions in the format string?
6866   if (!HasVAListArg) {
6867       // Find any arguments that weren't covered.
6868     CoveredArgs.flip();
6869     signed notCoveredArg = CoveredArgs.find_first();
6870     if (notCoveredArg >= 0) {
6871       assert((unsigned)notCoveredArg < NumDataArgs);
6872       UncoveredArg.Update(notCoveredArg, OrigFormatExpr);
6873     } else {
6874       UncoveredArg.setAllCovered();
6875     }
6876   }
6877 }
6878 
6879 void UncoveredArgHandler::Diagnose(Sema &S, bool IsFunctionCall,
6880                                    const Expr *ArgExpr) {
6881   assert(hasUncoveredArg() && DiagnosticExprs.size() > 0 &&
6882          "Invalid state");
6883 
6884   if (!ArgExpr)
6885     return;
6886 
6887   SourceLocation Loc = ArgExpr->getBeginLoc();
6888 
6889   if (S.getSourceManager().isInSystemMacro(Loc))
6890     return;
6891 
6892   PartialDiagnostic PDiag = S.PDiag(diag::warn_printf_data_arg_not_used);
6893   for (auto E : DiagnosticExprs)
6894     PDiag << E->getSourceRange();
6895 
6896   CheckFormatHandler::EmitFormatDiagnostic(
6897                                   S, IsFunctionCall, DiagnosticExprs[0],
6898                                   PDiag, Loc, /*IsStringLocation*/false,
6899                                   DiagnosticExprs[0]->getSourceRange());
6900 }
6901 
6902 bool
6903 CheckFormatHandler::HandleInvalidConversionSpecifier(unsigned argIndex,
6904                                                      SourceLocation Loc,
6905                                                      const char *startSpec,
6906                                                      unsigned specifierLen,
6907                                                      const char *csStart,
6908                                                      unsigned csLen) {
6909   bool keepGoing = true;
6910   if (argIndex < NumDataArgs) {
6911     // Consider the argument coverered, even though the specifier doesn't
6912     // make sense.
6913     CoveredArgs.set(argIndex);
6914   }
6915   else {
6916     // If argIndex exceeds the number of data arguments we
6917     // don't issue a warning because that is just a cascade of warnings (and
6918     // they may have intended '%%' anyway). We don't want to continue processing
6919     // the format string after this point, however, as we will like just get
6920     // gibberish when trying to match arguments.
6921     keepGoing = false;
6922   }
6923 
6924   StringRef Specifier(csStart, csLen);
6925 
6926   // If the specifier in non-printable, it could be the first byte of a UTF-8
6927   // sequence. In that case, print the UTF-8 code point. If not, print the byte
6928   // hex value.
6929   std::string CodePointStr;
6930   if (!llvm::sys::locale::isPrint(*csStart)) {
6931     llvm::UTF32 CodePoint;
6932     const llvm::UTF8 **B = reinterpret_cast<const llvm::UTF8 **>(&csStart);
6933     const llvm::UTF8 *E =
6934         reinterpret_cast<const llvm::UTF8 *>(csStart + csLen);
6935     llvm::ConversionResult Result =
6936         llvm::convertUTF8Sequence(B, E, &CodePoint, llvm::strictConversion);
6937 
6938     if (Result != llvm::conversionOK) {
6939       unsigned char FirstChar = *csStart;
6940       CodePoint = (llvm::UTF32)FirstChar;
6941     }
6942 
6943     llvm::raw_string_ostream OS(CodePointStr);
6944     if (CodePoint < 256)
6945       OS << "\\x" << llvm::format("%02x", CodePoint);
6946     else if (CodePoint <= 0xFFFF)
6947       OS << "\\u" << llvm::format("%04x", CodePoint);
6948     else
6949       OS << "\\U" << llvm::format("%08x", CodePoint);
6950     OS.flush();
6951     Specifier = CodePointStr;
6952   }
6953 
6954   EmitFormatDiagnostic(
6955       S.PDiag(diag::warn_format_invalid_conversion) << Specifier, Loc,
6956       /*IsStringLocation*/ true, getSpecifierRange(startSpec, specifierLen));
6957 
6958   return keepGoing;
6959 }
6960 
6961 void
6962 CheckFormatHandler::HandlePositionalNonpositionalArgs(SourceLocation Loc,
6963                                                       const char *startSpec,
6964                                                       unsigned specifierLen) {
6965   EmitFormatDiagnostic(
6966     S.PDiag(diag::warn_format_mix_positional_nonpositional_args),
6967     Loc, /*isStringLoc*/true, getSpecifierRange(startSpec, specifierLen));
6968 }
6969 
6970 bool
6971 CheckFormatHandler::CheckNumArgs(
6972   const analyze_format_string::FormatSpecifier &FS,
6973   const analyze_format_string::ConversionSpecifier &CS,
6974   const char *startSpecifier, unsigned specifierLen, unsigned argIndex) {
6975 
6976   if (argIndex >= NumDataArgs) {
6977     PartialDiagnostic PDiag = FS.usesPositionalArg()
6978       ? (S.PDiag(diag::warn_printf_positional_arg_exceeds_data_args)
6979            << (argIndex+1) << NumDataArgs)
6980       : S.PDiag(diag::warn_printf_insufficient_data_args);
6981     EmitFormatDiagnostic(
6982       PDiag, getLocationOfByte(CS.getStart()), /*IsStringLocation*/true,
6983       getSpecifierRange(startSpecifier, specifierLen));
6984 
6985     // Since more arguments than conversion tokens are given, by extension
6986     // all arguments are covered, so mark this as so.
6987     UncoveredArg.setAllCovered();
6988     return false;
6989   }
6990   return true;
6991 }
6992 
6993 template<typename Range>
6994 void CheckFormatHandler::EmitFormatDiagnostic(PartialDiagnostic PDiag,
6995                                               SourceLocation Loc,
6996                                               bool IsStringLocation,
6997                                               Range StringRange,
6998                                               ArrayRef<FixItHint> FixIt) {
6999   EmitFormatDiagnostic(S, inFunctionCall, Args[FormatIdx], PDiag,
7000                        Loc, IsStringLocation, StringRange, FixIt);
7001 }
7002 
7003 /// If the format string is not within the function call, emit a note
7004 /// so that the function call and string are in diagnostic messages.
7005 ///
7006 /// \param InFunctionCall if true, the format string is within the function
7007 /// call and only one diagnostic message will be produced.  Otherwise, an
7008 /// extra note will be emitted pointing to location of the format string.
7009 ///
7010 /// \param ArgumentExpr the expression that is passed as the format string
7011 /// argument in the function call.  Used for getting locations when two
7012 /// diagnostics are emitted.
7013 ///
7014 /// \param PDiag the callee should already have provided any strings for the
7015 /// diagnostic message.  This function only adds locations and fixits
7016 /// to diagnostics.
7017 ///
7018 /// \param Loc primary location for diagnostic.  If two diagnostics are
7019 /// required, one will be at Loc and a new SourceLocation will be created for
7020 /// the other one.
7021 ///
7022 /// \param IsStringLocation if true, Loc points to the format string should be
7023 /// used for the note.  Otherwise, Loc points to the argument list and will
7024 /// be used with PDiag.
7025 ///
7026 /// \param StringRange some or all of the string to highlight.  This is
7027 /// templated so it can accept either a CharSourceRange or a SourceRange.
7028 ///
7029 /// \param FixIt optional fix it hint for the format string.
7030 template <typename Range>
7031 void CheckFormatHandler::EmitFormatDiagnostic(
7032     Sema &S, bool InFunctionCall, const Expr *ArgumentExpr,
7033     const PartialDiagnostic &PDiag, SourceLocation Loc, bool IsStringLocation,
7034     Range StringRange, ArrayRef<FixItHint> FixIt) {
7035   if (InFunctionCall) {
7036     const Sema::SemaDiagnosticBuilder &D = S.Diag(Loc, PDiag);
7037     D << StringRange;
7038     D << FixIt;
7039   } else {
7040     S.Diag(IsStringLocation ? ArgumentExpr->getExprLoc() : Loc, PDiag)
7041       << ArgumentExpr->getSourceRange();
7042 
7043     const Sema::SemaDiagnosticBuilder &Note =
7044       S.Diag(IsStringLocation ? Loc : StringRange.getBegin(),
7045              diag::note_format_string_defined);
7046 
7047     Note << StringRange;
7048     Note << FixIt;
7049   }
7050 }
7051 
7052 //===--- CHECK: Printf format string checking ------------------------------===//
7053 
7054 namespace {
7055 
7056 class CheckPrintfHandler : public CheckFormatHandler {
7057 public:
7058   CheckPrintfHandler(Sema &s, const FormatStringLiteral *fexpr,
7059                      const Expr *origFormatExpr,
7060                      const Sema::FormatStringType type, unsigned firstDataArg,
7061                      unsigned numDataArgs, bool isObjC, const char *beg,
7062                      bool hasVAListArg, ArrayRef<const Expr *> Args,
7063                      unsigned formatIdx, bool inFunctionCall,
7064                      Sema::VariadicCallType CallType,
7065                      llvm::SmallBitVector &CheckedVarArgs,
7066                      UncoveredArgHandler &UncoveredArg)
7067       : CheckFormatHandler(s, fexpr, origFormatExpr, type, firstDataArg,
7068                            numDataArgs, beg, hasVAListArg, Args, formatIdx,
7069                            inFunctionCall, CallType, CheckedVarArgs,
7070                            UncoveredArg) {}
7071 
7072   bool isObjCContext() const { return FSType == Sema::FST_NSString; }
7073 
7074   /// Returns true if '%@' specifiers are allowed in the format string.
7075   bool allowsObjCArg() const {
7076     return FSType == Sema::FST_NSString || FSType == Sema::FST_OSLog ||
7077            FSType == Sema::FST_OSTrace;
7078   }
7079 
7080   bool HandleInvalidPrintfConversionSpecifier(
7081                                       const analyze_printf::PrintfSpecifier &FS,
7082                                       const char *startSpecifier,
7083                                       unsigned specifierLen) override;
7084 
7085   bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
7086                              const char *startSpecifier,
7087                              unsigned specifierLen) override;
7088   bool checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
7089                        const char *StartSpecifier,
7090                        unsigned SpecifierLen,
7091                        const Expr *E);
7092 
7093   bool HandleAmount(const analyze_format_string::OptionalAmount &Amt, unsigned k,
7094                     const char *startSpecifier, unsigned specifierLen);
7095   void HandleInvalidAmount(const analyze_printf::PrintfSpecifier &FS,
7096                            const analyze_printf::OptionalAmount &Amt,
7097                            unsigned type,
7098                            const char *startSpecifier, unsigned specifierLen);
7099   void HandleFlag(const analyze_printf::PrintfSpecifier &FS,
7100                   const analyze_printf::OptionalFlag &flag,
7101                   const char *startSpecifier, unsigned specifierLen);
7102   void HandleIgnoredFlag(const analyze_printf::PrintfSpecifier &FS,
7103                          const analyze_printf::OptionalFlag &ignoredFlag,
7104                          const analyze_printf::OptionalFlag &flag,
7105                          const char *startSpecifier, unsigned specifierLen);
7106   bool checkForCStrMembers(const analyze_printf::ArgType &AT,
7107                            const Expr *E);
7108 
7109   void HandleEmptyObjCModifierFlag(const char *startFlag,
7110                                    unsigned flagLen) override;
7111 
7112   void HandleInvalidObjCModifierFlag(const char *startFlag,
7113                                             unsigned flagLen) override;
7114 
7115   void HandleObjCFlagsWithNonObjCConversion(const char *flagsStart,
7116                                            const char *flagsEnd,
7117                                            const char *conversionPosition)
7118                                              override;
7119 };
7120 
7121 } // namespace
7122 
7123 bool CheckPrintfHandler::HandleInvalidPrintfConversionSpecifier(
7124                                       const analyze_printf::PrintfSpecifier &FS,
7125                                       const char *startSpecifier,
7126                                       unsigned specifierLen) {
7127   const analyze_printf::PrintfConversionSpecifier &CS =
7128     FS.getConversionSpecifier();
7129 
7130   return HandleInvalidConversionSpecifier(FS.getArgIndex(),
7131                                           getLocationOfByte(CS.getStart()),
7132                                           startSpecifier, specifierLen,
7133                                           CS.getStart(), CS.getLength());
7134 }
7135 
7136 bool CheckPrintfHandler::HandleAmount(
7137                                const analyze_format_string::OptionalAmount &Amt,
7138                                unsigned k, const char *startSpecifier,
7139                                unsigned specifierLen) {
7140   if (Amt.hasDataArgument()) {
7141     if (!HasVAListArg) {
7142       unsigned argIndex = Amt.getArgIndex();
7143       if (argIndex >= NumDataArgs) {
7144         EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_missing_arg)
7145                                << k,
7146                              getLocationOfByte(Amt.getStart()),
7147                              /*IsStringLocation*/true,
7148                              getSpecifierRange(startSpecifier, specifierLen));
7149         // Don't do any more checking.  We will just emit
7150         // spurious errors.
7151         return false;
7152       }
7153 
7154       // Type check the data argument.  It should be an 'int'.
7155       // Although not in conformance with C99, we also allow the argument to be
7156       // an 'unsigned int' as that is a reasonably safe case.  GCC also
7157       // doesn't emit a warning for that case.
7158       CoveredArgs.set(argIndex);
7159       const Expr *Arg = getDataArg(argIndex);
7160       if (!Arg)
7161         return false;
7162 
7163       QualType T = Arg->getType();
7164 
7165       const analyze_printf::ArgType &AT = Amt.getArgType(S.Context);
7166       assert(AT.isValid());
7167 
7168       if (!AT.matchesType(S.Context, T)) {
7169         EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_wrong_type)
7170                                << k << AT.getRepresentativeTypeName(S.Context)
7171                                << T << Arg->getSourceRange(),
7172                              getLocationOfByte(Amt.getStart()),
7173                              /*IsStringLocation*/true,
7174                              getSpecifierRange(startSpecifier, specifierLen));
7175         // Don't do any more checking.  We will just emit
7176         // spurious errors.
7177         return false;
7178       }
7179     }
7180   }
7181   return true;
7182 }
7183 
7184 void CheckPrintfHandler::HandleInvalidAmount(
7185                                       const analyze_printf::PrintfSpecifier &FS,
7186                                       const analyze_printf::OptionalAmount &Amt,
7187                                       unsigned type,
7188                                       const char *startSpecifier,
7189                                       unsigned specifierLen) {
7190   const analyze_printf::PrintfConversionSpecifier &CS =
7191     FS.getConversionSpecifier();
7192 
7193   FixItHint fixit =
7194     Amt.getHowSpecified() == analyze_printf::OptionalAmount::Constant
7195       ? FixItHint::CreateRemoval(getSpecifierRange(Amt.getStart(),
7196                                  Amt.getConstantLength()))
7197       : FixItHint();
7198 
7199   EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_optional_amount)
7200                          << type << CS.toString(),
7201                        getLocationOfByte(Amt.getStart()),
7202                        /*IsStringLocation*/true,
7203                        getSpecifierRange(startSpecifier, specifierLen),
7204                        fixit);
7205 }
7206 
7207 void CheckPrintfHandler::HandleFlag(const analyze_printf::PrintfSpecifier &FS,
7208                                     const analyze_printf::OptionalFlag &flag,
7209                                     const char *startSpecifier,
7210                                     unsigned specifierLen) {
7211   // Warn about pointless flag with a fixit removal.
7212   const analyze_printf::PrintfConversionSpecifier &CS =
7213     FS.getConversionSpecifier();
7214   EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_flag)
7215                          << flag.toString() << CS.toString(),
7216                        getLocationOfByte(flag.getPosition()),
7217                        /*IsStringLocation*/true,
7218                        getSpecifierRange(startSpecifier, specifierLen),
7219                        FixItHint::CreateRemoval(
7220                          getSpecifierRange(flag.getPosition(), 1)));
7221 }
7222 
7223 void CheckPrintfHandler::HandleIgnoredFlag(
7224                                 const analyze_printf::PrintfSpecifier &FS,
7225                                 const analyze_printf::OptionalFlag &ignoredFlag,
7226                                 const analyze_printf::OptionalFlag &flag,
7227                                 const char *startSpecifier,
7228                                 unsigned specifierLen) {
7229   // Warn about ignored flag with a fixit removal.
7230   EmitFormatDiagnostic(S.PDiag(diag::warn_printf_ignored_flag)
7231                          << ignoredFlag.toString() << flag.toString(),
7232                        getLocationOfByte(ignoredFlag.getPosition()),
7233                        /*IsStringLocation*/true,
7234                        getSpecifierRange(startSpecifier, specifierLen),
7235                        FixItHint::CreateRemoval(
7236                          getSpecifierRange(ignoredFlag.getPosition(), 1)));
7237 }
7238 
7239 void CheckPrintfHandler::HandleEmptyObjCModifierFlag(const char *startFlag,
7240                                                      unsigned flagLen) {
7241   // Warn about an empty flag.
7242   EmitFormatDiagnostic(S.PDiag(diag::warn_printf_empty_objc_flag),
7243                        getLocationOfByte(startFlag),
7244                        /*IsStringLocation*/true,
7245                        getSpecifierRange(startFlag, flagLen));
7246 }
7247 
7248 void CheckPrintfHandler::HandleInvalidObjCModifierFlag(const char *startFlag,
7249                                                        unsigned flagLen) {
7250   // Warn about an invalid flag.
7251   auto Range = getSpecifierRange(startFlag, flagLen);
7252   StringRef flag(startFlag, flagLen);
7253   EmitFormatDiagnostic(S.PDiag(diag::warn_printf_invalid_objc_flag) << flag,
7254                       getLocationOfByte(startFlag),
7255                       /*IsStringLocation*/true,
7256                       Range, FixItHint::CreateRemoval(Range));
7257 }
7258 
7259 void CheckPrintfHandler::HandleObjCFlagsWithNonObjCConversion(
7260     const char *flagsStart, const char *flagsEnd, const char *conversionPosition) {
7261     // Warn about using '[...]' without a '@' conversion.
7262     auto Range = getSpecifierRange(flagsStart, flagsEnd - flagsStart + 1);
7263     auto diag = diag::warn_printf_ObjCflags_without_ObjCConversion;
7264     EmitFormatDiagnostic(S.PDiag(diag) << StringRef(conversionPosition, 1),
7265                          getLocationOfByte(conversionPosition),
7266                          /*IsStringLocation*/true,
7267                          Range, FixItHint::CreateRemoval(Range));
7268 }
7269 
7270 // Determines if the specified is a C++ class or struct containing
7271 // a member with the specified name and kind (e.g. a CXXMethodDecl named
7272 // "c_str()").
7273 template<typename MemberKind>
7274 static llvm::SmallPtrSet<MemberKind*, 1>
7275 CXXRecordMembersNamed(StringRef Name, Sema &S, QualType Ty) {
7276   const RecordType *RT = Ty->getAs<RecordType>();
7277   llvm::SmallPtrSet<MemberKind*, 1> Results;
7278 
7279   if (!RT)
7280     return Results;
7281   const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
7282   if (!RD || !RD->getDefinition())
7283     return Results;
7284 
7285   LookupResult R(S, &S.Context.Idents.get(Name), SourceLocation(),
7286                  Sema::LookupMemberName);
7287   R.suppressDiagnostics();
7288 
7289   // We just need to include all members of the right kind turned up by the
7290   // filter, at this point.
7291   if (S.LookupQualifiedName(R, RT->getDecl()))
7292     for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
7293       NamedDecl *decl = (*I)->getUnderlyingDecl();
7294       if (MemberKind *FK = dyn_cast<MemberKind>(decl))
7295         Results.insert(FK);
7296     }
7297   return Results;
7298 }
7299 
7300 /// Check if we could call '.c_str()' on an object.
7301 ///
7302 /// FIXME: This returns the wrong results in some cases (if cv-qualifiers don't
7303 /// allow the call, or if it would be ambiguous).
7304 bool Sema::hasCStrMethod(const Expr *E) {
7305   using MethodSet = llvm::SmallPtrSet<CXXMethodDecl *, 1>;
7306 
7307   MethodSet Results =
7308       CXXRecordMembersNamed<CXXMethodDecl>("c_str", *this, E->getType());
7309   for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
7310        MI != ME; ++MI)
7311     if ((*MI)->getMinRequiredArguments() == 0)
7312       return true;
7313   return false;
7314 }
7315 
7316 // Check if a (w)string was passed when a (w)char* was needed, and offer a
7317 // better diagnostic if so. AT is assumed to be valid.
7318 // Returns true when a c_str() conversion method is found.
7319 bool CheckPrintfHandler::checkForCStrMembers(
7320     const analyze_printf::ArgType &AT, const Expr *E) {
7321   using MethodSet = llvm::SmallPtrSet<CXXMethodDecl *, 1>;
7322 
7323   MethodSet Results =
7324       CXXRecordMembersNamed<CXXMethodDecl>("c_str", S, E->getType());
7325 
7326   for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
7327        MI != ME; ++MI) {
7328     const CXXMethodDecl *Method = *MI;
7329     if (Method->getMinRequiredArguments() == 0 &&
7330         AT.matchesType(S.Context, Method->getReturnType())) {
7331       // FIXME: Suggest parens if the expression needs them.
7332       SourceLocation EndLoc = S.getLocForEndOfToken(E->getEndLoc());
7333       S.Diag(E->getBeginLoc(), diag::note_printf_c_str)
7334           << "c_str()" << FixItHint::CreateInsertion(EndLoc, ".c_str()");
7335       return true;
7336     }
7337   }
7338 
7339   return false;
7340 }
7341 
7342 bool
7343 CheckPrintfHandler::HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier
7344                                             &FS,
7345                                           const char *startSpecifier,
7346                                           unsigned specifierLen) {
7347   using namespace analyze_format_string;
7348   using namespace analyze_printf;
7349 
7350   const PrintfConversionSpecifier &CS = FS.getConversionSpecifier();
7351 
7352   if (FS.consumesDataArgument()) {
7353     if (atFirstArg) {
7354         atFirstArg = false;
7355         usesPositionalArgs = FS.usesPositionalArg();
7356     }
7357     else if (usesPositionalArgs != FS.usesPositionalArg()) {
7358       HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
7359                                         startSpecifier, specifierLen);
7360       return false;
7361     }
7362   }
7363 
7364   // First check if the field width, precision, and conversion specifier
7365   // have matching data arguments.
7366   if (!HandleAmount(FS.getFieldWidth(), /* field width */ 0,
7367                     startSpecifier, specifierLen)) {
7368     return false;
7369   }
7370 
7371   if (!HandleAmount(FS.getPrecision(), /* precision */ 1,
7372                     startSpecifier, specifierLen)) {
7373     return false;
7374   }
7375 
7376   if (!CS.consumesDataArgument()) {
7377     // FIXME: Technically specifying a precision or field width here
7378     // makes no sense.  Worth issuing a warning at some point.
7379     return true;
7380   }
7381 
7382   // Consume the argument.
7383   unsigned argIndex = FS.getArgIndex();
7384   if (argIndex < NumDataArgs) {
7385     // The check to see if the argIndex is valid will come later.
7386     // We set the bit here because we may exit early from this
7387     // function if we encounter some other error.
7388     CoveredArgs.set(argIndex);
7389   }
7390 
7391   // FreeBSD kernel extensions.
7392   if (CS.getKind() == ConversionSpecifier::FreeBSDbArg ||
7393       CS.getKind() == ConversionSpecifier::FreeBSDDArg) {
7394     // We need at least two arguments.
7395     if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex + 1))
7396       return false;
7397 
7398     // Claim the second argument.
7399     CoveredArgs.set(argIndex + 1);
7400 
7401     // Type check the first argument (int for %b, pointer for %D)
7402     const Expr *Ex = getDataArg(argIndex);
7403     const analyze_printf::ArgType &AT =
7404       (CS.getKind() == ConversionSpecifier::FreeBSDbArg) ?
7405         ArgType(S.Context.IntTy) : ArgType::CPointerTy;
7406     if (AT.isValid() && !AT.matchesType(S.Context, Ex->getType()))
7407       EmitFormatDiagnostic(
7408           S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
7409               << AT.getRepresentativeTypeName(S.Context) << Ex->getType()
7410               << false << Ex->getSourceRange(),
7411           Ex->getBeginLoc(), /*IsStringLocation*/ false,
7412           getSpecifierRange(startSpecifier, specifierLen));
7413 
7414     // Type check the second argument (char * for both %b and %D)
7415     Ex = getDataArg(argIndex + 1);
7416     const analyze_printf::ArgType &AT2 = ArgType::CStrTy;
7417     if (AT2.isValid() && !AT2.matchesType(S.Context, Ex->getType()))
7418       EmitFormatDiagnostic(
7419           S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
7420               << AT2.getRepresentativeTypeName(S.Context) << Ex->getType()
7421               << false << Ex->getSourceRange(),
7422           Ex->getBeginLoc(), /*IsStringLocation*/ false,
7423           getSpecifierRange(startSpecifier, specifierLen));
7424 
7425      return true;
7426   }
7427 
7428   // Check for using an Objective-C specific conversion specifier
7429   // in a non-ObjC literal.
7430   if (!allowsObjCArg() && CS.isObjCArg()) {
7431     return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
7432                                                   specifierLen);
7433   }
7434 
7435   // %P can only be used with os_log.
7436   if (FSType != Sema::FST_OSLog && CS.getKind() == ConversionSpecifier::PArg) {
7437     return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
7438                                                   specifierLen);
7439   }
7440 
7441   // %n is not allowed with os_log.
7442   if (FSType == Sema::FST_OSLog && CS.getKind() == ConversionSpecifier::nArg) {
7443     EmitFormatDiagnostic(S.PDiag(diag::warn_os_log_format_narg),
7444                          getLocationOfByte(CS.getStart()),
7445                          /*IsStringLocation*/ false,
7446                          getSpecifierRange(startSpecifier, specifierLen));
7447 
7448     return true;
7449   }
7450 
7451   // Only scalars are allowed for os_trace.
7452   if (FSType == Sema::FST_OSTrace &&
7453       (CS.getKind() == ConversionSpecifier::PArg ||
7454        CS.getKind() == ConversionSpecifier::sArg ||
7455        CS.getKind() == ConversionSpecifier::ObjCObjArg)) {
7456     return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
7457                                                   specifierLen);
7458   }
7459 
7460   // Check for use of public/private annotation outside of os_log().
7461   if (FSType != Sema::FST_OSLog) {
7462     if (FS.isPublic().isSet()) {
7463       EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_annotation)
7464                                << "public",
7465                            getLocationOfByte(FS.isPublic().getPosition()),
7466                            /*IsStringLocation*/ false,
7467                            getSpecifierRange(startSpecifier, specifierLen));
7468     }
7469     if (FS.isPrivate().isSet()) {
7470       EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_annotation)
7471                                << "private",
7472                            getLocationOfByte(FS.isPrivate().getPosition()),
7473                            /*IsStringLocation*/ false,
7474                            getSpecifierRange(startSpecifier, specifierLen));
7475     }
7476   }
7477 
7478   // Check for invalid use of field width
7479   if (!FS.hasValidFieldWidth()) {
7480     HandleInvalidAmount(FS, FS.getFieldWidth(), /* field width */ 0,
7481         startSpecifier, specifierLen);
7482   }
7483 
7484   // Check for invalid use of precision
7485   if (!FS.hasValidPrecision()) {
7486     HandleInvalidAmount(FS, FS.getPrecision(), /* precision */ 1,
7487         startSpecifier, specifierLen);
7488   }
7489 
7490   // Precision is mandatory for %P specifier.
7491   if (CS.getKind() == ConversionSpecifier::PArg &&
7492       FS.getPrecision().getHowSpecified() == OptionalAmount::NotSpecified) {
7493     EmitFormatDiagnostic(S.PDiag(diag::warn_format_P_no_precision),
7494                          getLocationOfByte(startSpecifier),
7495                          /*IsStringLocation*/ false,
7496                          getSpecifierRange(startSpecifier, specifierLen));
7497   }
7498 
7499   // Check each flag does not conflict with any other component.
7500   if (!FS.hasValidThousandsGroupingPrefix())
7501     HandleFlag(FS, FS.hasThousandsGrouping(), startSpecifier, specifierLen);
7502   if (!FS.hasValidLeadingZeros())
7503     HandleFlag(FS, FS.hasLeadingZeros(), startSpecifier, specifierLen);
7504   if (!FS.hasValidPlusPrefix())
7505     HandleFlag(FS, FS.hasPlusPrefix(), startSpecifier, specifierLen);
7506   if (!FS.hasValidSpacePrefix())
7507     HandleFlag(FS, FS.hasSpacePrefix(), startSpecifier, specifierLen);
7508   if (!FS.hasValidAlternativeForm())
7509     HandleFlag(FS, FS.hasAlternativeForm(), startSpecifier, specifierLen);
7510   if (!FS.hasValidLeftJustified())
7511     HandleFlag(FS, FS.isLeftJustified(), startSpecifier, specifierLen);
7512 
7513   // Check that flags are not ignored by another flag
7514   if (FS.hasSpacePrefix() && FS.hasPlusPrefix()) // ' ' ignored by '+'
7515     HandleIgnoredFlag(FS, FS.hasSpacePrefix(), FS.hasPlusPrefix(),
7516         startSpecifier, specifierLen);
7517   if (FS.hasLeadingZeros() && FS.isLeftJustified()) // '0' ignored by '-'
7518     HandleIgnoredFlag(FS, FS.hasLeadingZeros(), FS.isLeftJustified(),
7519             startSpecifier, specifierLen);
7520 
7521   // Check the length modifier is valid with the given conversion specifier.
7522   if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo()))
7523     HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
7524                                 diag::warn_format_nonsensical_length);
7525   else if (!FS.hasStandardLengthModifier())
7526     HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
7527   else if (!FS.hasStandardLengthConversionCombination())
7528     HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
7529                                 diag::warn_format_non_standard_conversion_spec);
7530 
7531   if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
7532     HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);
7533 
7534   // The remaining checks depend on the data arguments.
7535   if (HasVAListArg)
7536     return true;
7537 
7538   if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
7539     return false;
7540 
7541   const Expr *Arg = getDataArg(argIndex);
7542   if (!Arg)
7543     return true;
7544 
7545   return checkFormatExpr(FS, startSpecifier, specifierLen, Arg);
7546 }
7547 
7548 static bool requiresParensToAddCast(const Expr *E) {
7549   // FIXME: We should have a general way to reason about operator
7550   // precedence and whether parens are actually needed here.
7551   // Take care of a few common cases where they aren't.
7552   const Expr *Inside = E->IgnoreImpCasts();
7553   if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(Inside))
7554     Inside = POE->getSyntacticForm()->IgnoreImpCasts();
7555 
7556   switch (Inside->getStmtClass()) {
7557   case Stmt::ArraySubscriptExprClass:
7558   case Stmt::CallExprClass:
7559   case Stmt::CharacterLiteralClass:
7560   case Stmt::CXXBoolLiteralExprClass:
7561   case Stmt::DeclRefExprClass:
7562   case Stmt::FloatingLiteralClass:
7563   case Stmt::IntegerLiteralClass:
7564   case Stmt::MemberExprClass:
7565   case Stmt::ObjCArrayLiteralClass:
7566   case Stmt::ObjCBoolLiteralExprClass:
7567   case Stmt::ObjCBoxedExprClass:
7568   case Stmt::ObjCDictionaryLiteralClass:
7569   case Stmt::ObjCEncodeExprClass:
7570   case Stmt::ObjCIvarRefExprClass:
7571   case Stmt::ObjCMessageExprClass:
7572   case Stmt::ObjCPropertyRefExprClass:
7573   case Stmt::ObjCStringLiteralClass:
7574   case Stmt::ObjCSubscriptRefExprClass:
7575   case Stmt::ParenExprClass:
7576   case Stmt::StringLiteralClass:
7577   case Stmt::UnaryOperatorClass:
7578     return false;
7579   default:
7580     return true;
7581   }
7582 }
7583 
7584 static std::pair<QualType, StringRef>
7585 shouldNotPrintDirectly(const ASTContext &Context,
7586                        QualType IntendedTy,
7587                        const Expr *E) {
7588   // Use a 'while' to peel off layers of typedefs.
7589   QualType TyTy = IntendedTy;
7590   while (const TypedefType *UserTy = TyTy->getAs<TypedefType>()) {
7591     StringRef Name = UserTy->getDecl()->getName();
7592     QualType CastTy = llvm::StringSwitch<QualType>(Name)
7593       .Case("CFIndex", Context.getNSIntegerType())
7594       .Case("NSInteger", Context.getNSIntegerType())
7595       .Case("NSUInteger", Context.getNSUIntegerType())
7596       .Case("SInt32", Context.IntTy)
7597       .Case("UInt32", Context.UnsignedIntTy)
7598       .Default(QualType());
7599 
7600     if (!CastTy.isNull())
7601       return std::make_pair(CastTy, Name);
7602 
7603     TyTy = UserTy->desugar();
7604   }
7605 
7606   // Strip parens if necessary.
7607   if (const ParenExpr *PE = dyn_cast<ParenExpr>(E))
7608     return shouldNotPrintDirectly(Context,
7609                                   PE->getSubExpr()->getType(),
7610                                   PE->getSubExpr());
7611 
7612   // If this is a conditional expression, then its result type is constructed
7613   // via usual arithmetic conversions and thus there might be no necessary
7614   // typedef sugar there.  Recurse to operands to check for NSInteger &
7615   // Co. usage condition.
7616   if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
7617     QualType TrueTy, FalseTy;
7618     StringRef TrueName, FalseName;
7619 
7620     std::tie(TrueTy, TrueName) =
7621       shouldNotPrintDirectly(Context,
7622                              CO->getTrueExpr()->getType(),
7623                              CO->getTrueExpr());
7624     std::tie(FalseTy, FalseName) =
7625       shouldNotPrintDirectly(Context,
7626                              CO->getFalseExpr()->getType(),
7627                              CO->getFalseExpr());
7628 
7629     if (TrueTy == FalseTy)
7630       return std::make_pair(TrueTy, TrueName);
7631     else if (TrueTy.isNull())
7632       return std::make_pair(FalseTy, FalseName);
7633     else if (FalseTy.isNull())
7634       return std::make_pair(TrueTy, TrueName);
7635   }
7636 
7637   return std::make_pair(QualType(), StringRef());
7638 }
7639 
7640 bool
7641 CheckPrintfHandler::checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
7642                                     const char *StartSpecifier,
7643                                     unsigned SpecifierLen,
7644                                     const Expr *E) {
7645   using namespace analyze_format_string;
7646   using namespace analyze_printf;
7647 
7648   // Now type check the data expression that matches the
7649   // format specifier.
7650   const analyze_printf::ArgType &AT = FS.getArgType(S.Context, isObjCContext());
7651   if (!AT.isValid())
7652     return true;
7653 
7654   QualType ExprTy = E->getType();
7655   while (const TypeOfExprType *TET = dyn_cast<TypeOfExprType>(ExprTy)) {
7656     ExprTy = TET->getUnderlyingExpr()->getType();
7657   }
7658 
7659   const analyze_printf::ArgType::MatchKind Match =
7660       AT.matchesType(S.Context, ExprTy);
7661   bool Pedantic = Match == analyze_printf::ArgType::NoMatchPedantic;
7662   if (Match == analyze_printf::ArgType::Match)
7663     return true;
7664 
7665   // Look through argument promotions for our error message's reported type.
7666   // This includes the integral and floating promotions, but excludes array
7667   // and function pointer decay; seeing that an argument intended to be a
7668   // string has type 'char [6]' is probably more confusing than 'char *'.
7669   if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
7670     if (ICE->getCastKind() == CK_IntegralCast ||
7671         ICE->getCastKind() == CK_FloatingCast) {
7672       E = ICE->getSubExpr();
7673       ExprTy = E->getType();
7674 
7675       // Check if we didn't match because of an implicit cast from a 'char'
7676       // or 'short' to an 'int'.  This is done because printf is a varargs
7677       // function.
7678       if (ICE->getType() == S.Context.IntTy ||
7679           ICE->getType() == S.Context.UnsignedIntTy) {
7680         // All further checking is done on the subexpression.
7681         if (AT.matchesType(S.Context, ExprTy))
7682           return true;
7683       }
7684     }
7685   } else if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) {
7686     // Special case for 'a', which has type 'int' in C.
7687     // Note, however, that we do /not/ want to treat multibyte constants like
7688     // 'MooV' as characters! This form is deprecated but still exists.
7689     if (ExprTy == S.Context.IntTy)
7690       if (llvm::isUIntN(S.Context.getCharWidth(), CL->getValue()))
7691         ExprTy = S.Context.CharTy;
7692   }
7693 
7694   // Look through enums to their underlying type.
7695   bool IsEnum = false;
7696   if (auto EnumTy = ExprTy->getAs<EnumType>()) {
7697     ExprTy = EnumTy->getDecl()->getIntegerType();
7698     IsEnum = true;
7699   }
7700 
7701   // %C in an Objective-C context prints a unichar, not a wchar_t.
7702   // If the argument is an integer of some kind, believe the %C and suggest
7703   // a cast instead of changing the conversion specifier.
7704   QualType IntendedTy = ExprTy;
7705   if (isObjCContext() &&
7706       FS.getConversionSpecifier().getKind() == ConversionSpecifier::CArg) {
7707     if (ExprTy->isIntegralOrUnscopedEnumerationType() &&
7708         !ExprTy->isCharType()) {
7709       // 'unichar' is defined as a typedef of unsigned short, but we should
7710       // prefer using the typedef if it is visible.
7711       IntendedTy = S.Context.UnsignedShortTy;
7712 
7713       // While we are here, check if the value is an IntegerLiteral that happens
7714       // to be within the valid range.
7715       if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) {
7716         const llvm::APInt &V = IL->getValue();
7717         if (V.getActiveBits() <= S.Context.getTypeSize(IntendedTy))
7718           return true;
7719       }
7720 
7721       LookupResult Result(S, &S.Context.Idents.get("unichar"), E->getBeginLoc(),
7722                           Sema::LookupOrdinaryName);
7723       if (S.LookupName(Result, S.getCurScope())) {
7724         NamedDecl *ND = Result.getFoundDecl();
7725         if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(ND))
7726           if (TD->getUnderlyingType() == IntendedTy)
7727             IntendedTy = S.Context.getTypedefType(TD);
7728       }
7729     }
7730   }
7731 
7732   // Special-case some of Darwin's platform-independence types by suggesting
7733   // casts to primitive types that are known to be large enough.
7734   bool ShouldNotPrintDirectly = false; StringRef CastTyName;
7735   if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
7736     QualType CastTy;
7737     std::tie(CastTy, CastTyName) = shouldNotPrintDirectly(S.Context, IntendedTy, E);
7738     if (!CastTy.isNull()) {
7739       // %zi/%zu and %td/%tu are OK to use for NSInteger/NSUInteger of type int
7740       // (long in ASTContext). Only complain to pedants.
7741       if ((CastTyName == "NSInteger" || CastTyName == "NSUInteger") &&
7742           (AT.isSizeT() || AT.isPtrdiffT()) &&
7743           AT.matchesType(S.Context, CastTy))
7744         Pedantic = true;
7745       IntendedTy = CastTy;
7746       ShouldNotPrintDirectly = true;
7747     }
7748   }
7749 
7750   // We may be able to offer a FixItHint if it is a supported type.
7751   PrintfSpecifier fixedFS = FS;
7752   bool Success =
7753       fixedFS.fixType(IntendedTy, S.getLangOpts(), S.Context, isObjCContext());
7754 
7755   if (Success) {
7756     // Get the fix string from the fixed format specifier
7757     SmallString<16> buf;
7758     llvm::raw_svector_ostream os(buf);
7759     fixedFS.toString(os);
7760 
7761     CharSourceRange SpecRange = getSpecifierRange(StartSpecifier, SpecifierLen);
7762 
7763     if (IntendedTy == ExprTy && !ShouldNotPrintDirectly) {
7764       unsigned Diag =
7765           Pedantic
7766               ? diag::warn_format_conversion_argument_type_mismatch_pedantic
7767               : diag::warn_format_conversion_argument_type_mismatch;
7768       // In this case, the specifier is wrong and should be changed to match
7769       // the argument.
7770       EmitFormatDiagnostic(S.PDiag(Diag)
7771                                << AT.getRepresentativeTypeName(S.Context)
7772                                << IntendedTy << IsEnum << E->getSourceRange(),
7773                            E->getBeginLoc(),
7774                            /*IsStringLocation*/ false, SpecRange,
7775                            FixItHint::CreateReplacement(SpecRange, os.str()));
7776     } else {
7777       // The canonical type for formatting this value is different from the
7778       // actual type of the expression. (This occurs, for example, with Darwin's
7779       // NSInteger on 32-bit platforms, where it is typedef'd as 'int', but
7780       // should be printed as 'long' for 64-bit compatibility.)
7781       // Rather than emitting a normal format/argument mismatch, we want to
7782       // add a cast to the recommended type (and correct the format string
7783       // if necessary).
7784       SmallString<16> CastBuf;
7785       llvm::raw_svector_ostream CastFix(CastBuf);
7786       CastFix << "(";
7787       IntendedTy.print(CastFix, S.Context.getPrintingPolicy());
7788       CastFix << ")";
7789 
7790       SmallVector<FixItHint,4> Hints;
7791       if (!AT.matchesType(S.Context, IntendedTy) || ShouldNotPrintDirectly)
7792         Hints.push_back(FixItHint::CreateReplacement(SpecRange, os.str()));
7793 
7794       if (const CStyleCastExpr *CCast = dyn_cast<CStyleCastExpr>(E)) {
7795         // If there's already a cast present, just replace it.
7796         SourceRange CastRange(CCast->getLParenLoc(), CCast->getRParenLoc());
7797         Hints.push_back(FixItHint::CreateReplacement(CastRange, CastFix.str()));
7798 
7799       } else if (!requiresParensToAddCast(E)) {
7800         // If the expression has high enough precedence,
7801         // just write the C-style cast.
7802         Hints.push_back(
7803             FixItHint::CreateInsertion(E->getBeginLoc(), CastFix.str()));
7804       } else {
7805         // Otherwise, add parens around the expression as well as the cast.
7806         CastFix << "(";
7807         Hints.push_back(
7808             FixItHint::CreateInsertion(E->getBeginLoc(), CastFix.str()));
7809 
7810         SourceLocation After = S.getLocForEndOfToken(E->getEndLoc());
7811         Hints.push_back(FixItHint::CreateInsertion(After, ")"));
7812       }
7813 
7814       if (ShouldNotPrintDirectly) {
7815         // The expression has a type that should not be printed directly.
7816         // We extract the name from the typedef because we don't want to show
7817         // the underlying type in the diagnostic.
7818         StringRef Name;
7819         if (const TypedefType *TypedefTy = dyn_cast<TypedefType>(ExprTy))
7820           Name = TypedefTy->getDecl()->getName();
7821         else
7822           Name = CastTyName;
7823         unsigned Diag = Pedantic
7824                             ? diag::warn_format_argument_needs_cast_pedantic
7825                             : diag::warn_format_argument_needs_cast;
7826         EmitFormatDiagnostic(S.PDiag(Diag) << Name << IntendedTy << IsEnum
7827                                            << E->getSourceRange(),
7828                              E->getBeginLoc(), /*IsStringLocation=*/false,
7829                              SpecRange, Hints);
7830       } else {
7831         // In this case, the expression could be printed using a different
7832         // specifier, but we've decided that the specifier is probably correct
7833         // and we should cast instead. Just use the normal warning message.
7834         EmitFormatDiagnostic(
7835             S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
7836                 << AT.getRepresentativeTypeName(S.Context) << ExprTy << IsEnum
7837                 << E->getSourceRange(),
7838             E->getBeginLoc(), /*IsStringLocation*/ false, SpecRange, Hints);
7839       }
7840     }
7841   } else {
7842     const CharSourceRange &CSR = getSpecifierRange(StartSpecifier,
7843                                                    SpecifierLen);
7844     // Since the warning for passing non-POD types to variadic functions
7845     // was deferred until now, we emit a warning for non-POD
7846     // arguments here.
7847     switch (S.isValidVarArgType(ExprTy)) {
7848     case Sema::VAK_Valid:
7849     case Sema::VAK_ValidInCXX11: {
7850       unsigned Diag =
7851           Pedantic
7852               ? diag::warn_format_conversion_argument_type_mismatch_pedantic
7853               : diag::warn_format_conversion_argument_type_mismatch;
7854 
7855       EmitFormatDiagnostic(
7856           S.PDiag(Diag) << AT.getRepresentativeTypeName(S.Context) << ExprTy
7857                         << IsEnum << CSR << E->getSourceRange(),
7858           E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
7859       break;
7860     }
7861     case Sema::VAK_Undefined:
7862     case Sema::VAK_MSVCUndefined:
7863       EmitFormatDiagnostic(S.PDiag(diag::warn_non_pod_vararg_with_format_string)
7864                                << S.getLangOpts().CPlusPlus11 << ExprTy
7865                                << CallType
7866                                << AT.getRepresentativeTypeName(S.Context) << CSR
7867                                << E->getSourceRange(),
7868                            E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
7869       checkForCStrMembers(AT, E);
7870       break;
7871 
7872     case Sema::VAK_Invalid:
7873       if (ExprTy->isObjCObjectType())
7874         EmitFormatDiagnostic(
7875             S.PDiag(diag::err_cannot_pass_objc_interface_to_vararg_format)
7876                 << S.getLangOpts().CPlusPlus11 << ExprTy << CallType
7877                 << AT.getRepresentativeTypeName(S.Context) << CSR
7878                 << E->getSourceRange(),
7879             E->getBeginLoc(), /*IsStringLocation*/ false, CSR);
7880       else
7881         // FIXME: If this is an initializer list, suggest removing the braces
7882         // or inserting a cast to the target type.
7883         S.Diag(E->getBeginLoc(), diag::err_cannot_pass_to_vararg_format)
7884             << isa<InitListExpr>(E) << ExprTy << CallType
7885             << AT.getRepresentativeTypeName(S.Context) << E->getSourceRange();
7886       break;
7887     }
7888 
7889     assert(FirstDataArg + FS.getArgIndex() < CheckedVarArgs.size() &&
7890            "format string specifier index out of range");
7891     CheckedVarArgs[FirstDataArg + FS.getArgIndex()] = true;
7892   }
7893 
7894   return true;
7895 }
7896 
7897 //===--- CHECK: Scanf format string checking ------------------------------===//
7898 
7899 namespace {
7900 
7901 class CheckScanfHandler : public CheckFormatHandler {
7902 public:
7903   CheckScanfHandler(Sema &s, const FormatStringLiteral *fexpr,
7904                     const Expr *origFormatExpr, Sema::FormatStringType type,
7905                     unsigned firstDataArg, unsigned numDataArgs,
7906                     const char *beg, bool hasVAListArg,
7907                     ArrayRef<const Expr *> Args, unsigned formatIdx,
7908                     bool inFunctionCall, Sema::VariadicCallType CallType,
7909                     llvm::SmallBitVector &CheckedVarArgs,
7910                     UncoveredArgHandler &UncoveredArg)
7911       : CheckFormatHandler(s, fexpr, origFormatExpr, type, firstDataArg,
7912                            numDataArgs, beg, hasVAListArg, Args, formatIdx,
7913                            inFunctionCall, CallType, CheckedVarArgs,
7914                            UncoveredArg) {}
7915 
7916   bool HandleScanfSpecifier(const analyze_scanf::ScanfSpecifier &FS,
7917                             const char *startSpecifier,
7918                             unsigned specifierLen) override;
7919 
7920   bool HandleInvalidScanfConversionSpecifier(
7921           const analyze_scanf::ScanfSpecifier &FS,
7922           const char *startSpecifier,
7923           unsigned specifierLen) override;
7924 
7925   void HandleIncompleteScanList(const char *start, const char *end) override;
7926 };
7927 
7928 } // namespace
7929 
7930 void CheckScanfHandler::HandleIncompleteScanList(const char *start,
7931                                                  const char *end) {
7932   EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_scanlist_incomplete),
7933                        getLocationOfByte(end), /*IsStringLocation*/true,
7934                        getSpecifierRange(start, end - start));
7935 }
7936 
7937 bool CheckScanfHandler::HandleInvalidScanfConversionSpecifier(
7938                                         const analyze_scanf::ScanfSpecifier &FS,
7939                                         const char *startSpecifier,
7940                                         unsigned specifierLen) {
7941   const analyze_scanf::ScanfConversionSpecifier &CS =
7942     FS.getConversionSpecifier();
7943 
7944   return HandleInvalidConversionSpecifier(FS.getArgIndex(),
7945                                           getLocationOfByte(CS.getStart()),
7946                                           startSpecifier, specifierLen,
7947                                           CS.getStart(), CS.getLength());
7948 }
7949 
7950 bool CheckScanfHandler::HandleScanfSpecifier(
7951                                        const analyze_scanf::ScanfSpecifier &FS,
7952                                        const char *startSpecifier,
7953                                        unsigned specifierLen) {
7954   using namespace analyze_scanf;
7955   using namespace analyze_format_string;
7956 
7957   const ScanfConversionSpecifier &CS = FS.getConversionSpecifier();
7958 
7959   // Handle case where '%' and '*' don't consume an argument.  These shouldn't
7960   // be used to decide if we are using positional arguments consistently.
7961   if (FS.consumesDataArgument()) {
7962     if (atFirstArg) {
7963       atFirstArg = false;
7964       usesPositionalArgs = FS.usesPositionalArg();
7965     }
7966     else if (usesPositionalArgs != FS.usesPositionalArg()) {
7967       HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
7968                                         startSpecifier, specifierLen);
7969       return false;
7970     }
7971   }
7972 
7973   // Check if the field with is non-zero.
7974   const OptionalAmount &Amt = FS.getFieldWidth();
7975   if (Amt.getHowSpecified() == OptionalAmount::Constant) {
7976     if (Amt.getConstantAmount() == 0) {
7977       const CharSourceRange &R = getSpecifierRange(Amt.getStart(),
7978                                                    Amt.getConstantLength());
7979       EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_nonzero_width),
7980                            getLocationOfByte(Amt.getStart()),
7981                            /*IsStringLocation*/true, R,
7982                            FixItHint::CreateRemoval(R));
7983     }
7984   }
7985 
7986   if (!FS.consumesDataArgument()) {
7987     // FIXME: Technically specifying a precision or field width here
7988     // makes no sense.  Worth issuing a warning at some point.
7989     return true;
7990   }
7991 
7992   // Consume the argument.
7993   unsigned argIndex = FS.getArgIndex();
7994   if (argIndex < NumDataArgs) {
7995       // The check to see if the argIndex is valid will come later.
7996       // We set the bit here because we may exit early from this
7997       // function if we encounter some other error.
7998     CoveredArgs.set(argIndex);
7999   }
8000 
8001   // Check the length modifier is valid with the given conversion specifier.
8002   if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo()))
8003     HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
8004                                 diag::warn_format_nonsensical_length);
8005   else if (!FS.hasStandardLengthModifier())
8006     HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
8007   else if (!FS.hasStandardLengthConversionCombination())
8008     HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
8009                                 diag::warn_format_non_standard_conversion_spec);
8010 
8011   if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
8012     HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);
8013 
8014   // The remaining checks depend on the data arguments.
8015   if (HasVAListArg)
8016     return true;
8017 
8018   if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
8019     return false;
8020 
8021   // Check that the argument type matches the format specifier.
8022   const Expr *Ex = getDataArg(argIndex);
8023   if (!Ex)
8024     return true;
8025 
8026   const analyze_format_string::ArgType &AT = FS.getArgType(S.Context);
8027 
8028   if (!AT.isValid()) {
8029     return true;
8030   }
8031 
8032   analyze_format_string::ArgType::MatchKind Match =
8033       AT.matchesType(S.Context, Ex->getType());
8034   bool Pedantic = Match == analyze_format_string::ArgType::NoMatchPedantic;
8035   if (Match == analyze_format_string::ArgType::Match)
8036     return true;
8037 
8038   ScanfSpecifier fixedFS = FS;
8039   bool Success = fixedFS.fixType(Ex->getType(), Ex->IgnoreImpCasts()->getType(),
8040                                  S.getLangOpts(), S.Context);
8041 
8042   unsigned Diag =
8043       Pedantic ? diag::warn_format_conversion_argument_type_mismatch_pedantic
8044                : diag::warn_format_conversion_argument_type_mismatch;
8045 
8046   if (Success) {
8047     // Get the fix string from the fixed format specifier.
8048     SmallString<128> buf;
8049     llvm::raw_svector_ostream os(buf);
8050     fixedFS.toString(os);
8051 
8052     EmitFormatDiagnostic(
8053         S.PDiag(Diag) << AT.getRepresentativeTypeName(S.Context)
8054                       << Ex->getType() << false << Ex->getSourceRange(),
8055         Ex->getBeginLoc(),
8056         /*IsStringLocation*/ false,
8057         getSpecifierRange(startSpecifier, specifierLen),
8058         FixItHint::CreateReplacement(
8059             getSpecifierRange(startSpecifier, specifierLen), os.str()));
8060   } else {
8061     EmitFormatDiagnostic(S.PDiag(Diag)
8062                              << AT.getRepresentativeTypeName(S.Context)
8063                              << Ex->getType() << false << Ex->getSourceRange(),
8064                          Ex->getBeginLoc(),
8065                          /*IsStringLocation*/ false,
8066                          getSpecifierRange(startSpecifier, specifierLen));
8067   }
8068 
8069   return true;
8070 }
8071 
8072 static void CheckFormatString(Sema &S, const FormatStringLiteral *FExpr,
8073                               const Expr *OrigFormatExpr,
8074                               ArrayRef<const Expr *> Args,
8075                               bool HasVAListArg, unsigned format_idx,
8076                               unsigned firstDataArg,
8077                               Sema::FormatStringType Type,
8078                               bool inFunctionCall,
8079                               Sema::VariadicCallType CallType,
8080                               llvm::SmallBitVector &CheckedVarArgs,
8081                               UncoveredArgHandler &UncoveredArg) {
8082   // CHECK: is the format string a wide literal?
8083   if (!FExpr->isAscii() && !FExpr->isUTF8()) {
8084     CheckFormatHandler::EmitFormatDiagnostic(
8085         S, inFunctionCall, Args[format_idx],
8086         S.PDiag(diag::warn_format_string_is_wide_literal), FExpr->getBeginLoc(),
8087         /*IsStringLocation*/ true, OrigFormatExpr->getSourceRange());
8088     return;
8089   }
8090 
8091   // Str - The format string.  NOTE: this is NOT null-terminated!
8092   StringRef StrRef = FExpr->getString();
8093   const char *Str = StrRef.data();
8094   // Account for cases where the string literal is truncated in a declaration.
8095   const ConstantArrayType *T =
8096     S.Context.getAsConstantArrayType(FExpr->getType());
8097   assert(T && "String literal not of constant array type!");
8098   size_t TypeSize = T->getSize().getZExtValue();
8099   size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
8100   const unsigned numDataArgs = Args.size() - firstDataArg;
8101 
8102   // Emit a warning if the string literal is truncated and does not contain an
8103   // embedded null character.
8104   if (TypeSize <= StrRef.size() &&
8105       StrRef.substr(0, TypeSize).find('\0') == StringRef::npos) {
8106     CheckFormatHandler::EmitFormatDiagnostic(
8107         S, inFunctionCall, Args[format_idx],
8108         S.PDiag(diag::warn_printf_format_string_not_null_terminated),
8109         FExpr->getBeginLoc(),
8110         /*IsStringLocation=*/true, OrigFormatExpr->getSourceRange());
8111     return;
8112   }
8113 
8114   // CHECK: empty format string?
8115   if (StrLen == 0 && numDataArgs > 0) {
8116     CheckFormatHandler::EmitFormatDiagnostic(
8117         S, inFunctionCall, Args[format_idx],
8118         S.PDiag(diag::warn_empty_format_string), FExpr->getBeginLoc(),
8119         /*IsStringLocation*/ true, OrigFormatExpr->getSourceRange());
8120     return;
8121   }
8122 
8123   if (Type == Sema::FST_Printf || Type == Sema::FST_NSString ||
8124       Type == Sema::FST_FreeBSDKPrintf || Type == Sema::FST_OSLog ||
8125       Type == Sema::FST_OSTrace) {
8126     CheckPrintfHandler H(
8127         S, FExpr, OrigFormatExpr, Type, firstDataArg, numDataArgs,
8128         (Type == Sema::FST_NSString || Type == Sema::FST_OSTrace), Str,
8129         HasVAListArg, Args, format_idx, inFunctionCall, CallType,
8130         CheckedVarArgs, UncoveredArg);
8131 
8132     if (!analyze_format_string::ParsePrintfString(H, Str, Str + StrLen,
8133                                                   S.getLangOpts(),
8134                                                   S.Context.getTargetInfo(),
8135                                             Type == Sema::FST_FreeBSDKPrintf))
8136       H.DoneProcessing();
8137   } else if (Type == Sema::FST_Scanf) {
8138     CheckScanfHandler H(S, FExpr, OrigFormatExpr, Type, firstDataArg,
8139                         numDataArgs, Str, HasVAListArg, Args, format_idx,
8140                         inFunctionCall, CallType, CheckedVarArgs, UncoveredArg);
8141 
8142     if (!analyze_format_string::ParseScanfString(H, Str, Str + StrLen,
8143                                                  S.getLangOpts(),
8144                                                  S.Context.getTargetInfo()))
8145       H.DoneProcessing();
8146   } // TODO: handle other formats
8147 }
8148 
8149 bool Sema::FormatStringHasSArg(const StringLiteral *FExpr) {
8150   // Str - The format string.  NOTE: this is NOT null-terminated!
8151   StringRef StrRef = FExpr->getString();
8152   const char *Str = StrRef.data();
8153   // Account for cases where the string literal is truncated in a declaration.
8154   const ConstantArrayType *T = Context.getAsConstantArrayType(FExpr->getType());
8155   assert(T && "String literal not of constant array type!");
8156   size_t TypeSize = T->getSize().getZExtValue();
8157   size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
8158   return analyze_format_string::ParseFormatStringHasSArg(Str, Str + StrLen,
8159                                                          getLangOpts(),
8160                                                          Context.getTargetInfo());
8161 }
8162 
8163 //===--- CHECK: Warn on use of wrong absolute value function. -------------===//
8164 
8165 // Returns the related absolute value function that is larger, of 0 if one
8166 // does not exist.
8167 static unsigned getLargerAbsoluteValueFunction(unsigned AbsFunction) {
8168   switch (AbsFunction) {
8169   default:
8170     return 0;
8171 
8172   case Builtin::BI__builtin_abs:
8173     return Builtin::BI__builtin_labs;
8174   case Builtin::BI__builtin_labs:
8175     return Builtin::BI__builtin_llabs;
8176   case Builtin::BI__builtin_llabs:
8177     return 0;
8178 
8179   case Builtin::BI__builtin_fabsf:
8180     return Builtin::BI__builtin_fabs;
8181   case Builtin::BI__builtin_fabs:
8182     return Builtin::BI__builtin_fabsl;
8183   case Builtin::BI__builtin_fabsl:
8184     return 0;
8185 
8186   case Builtin::BI__builtin_cabsf:
8187     return Builtin::BI__builtin_cabs;
8188   case Builtin::BI__builtin_cabs:
8189     return Builtin::BI__builtin_cabsl;
8190   case Builtin::BI__builtin_cabsl:
8191     return 0;
8192 
8193   case Builtin::BIabs:
8194     return Builtin::BIlabs;
8195   case Builtin::BIlabs:
8196     return Builtin::BIllabs;
8197   case Builtin::BIllabs:
8198     return 0;
8199 
8200   case Builtin::BIfabsf:
8201     return Builtin::BIfabs;
8202   case Builtin::BIfabs:
8203     return Builtin::BIfabsl;
8204   case Builtin::BIfabsl:
8205     return 0;
8206 
8207   case Builtin::BIcabsf:
8208    return Builtin::BIcabs;
8209   case Builtin::BIcabs:
8210     return Builtin::BIcabsl;
8211   case Builtin::BIcabsl:
8212     return 0;
8213   }
8214 }
8215 
8216 // Returns the argument type of the absolute value function.
8217 static QualType getAbsoluteValueArgumentType(ASTContext &Context,
8218                                              unsigned AbsType) {
8219   if (AbsType == 0)
8220     return QualType();
8221 
8222   ASTContext::GetBuiltinTypeError Error = ASTContext::GE_None;
8223   QualType BuiltinType = Context.GetBuiltinType(AbsType, Error);
8224   if (Error != ASTContext::GE_None)
8225     return QualType();
8226 
8227   const FunctionProtoType *FT = BuiltinType->getAs<FunctionProtoType>();
8228   if (!FT)
8229     return QualType();
8230 
8231   if (FT->getNumParams() != 1)
8232     return QualType();
8233 
8234   return FT->getParamType(0);
8235 }
8236 
8237 // Returns the best absolute value function, or zero, based on type and
8238 // current absolute value function.
8239 static unsigned getBestAbsFunction(ASTContext &Context, QualType ArgType,
8240                                    unsigned AbsFunctionKind) {
8241   unsigned BestKind = 0;
8242   uint64_t ArgSize = Context.getTypeSize(ArgType);
8243   for (unsigned Kind = AbsFunctionKind; Kind != 0;
8244        Kind = getLargerAbsoluteValueFunction(Kind)) {
8245     QualType ParamType = getAbsoluteValueArgumentType(Context, Kind);
8246     if (Context.getTypeSize(ParamType) >= ArgSize) {
8247       if (BestKind == 0)
8248         BestKind = Kind;
8249       else if (Context.hasSameType(ParamType, ArgType)) {
8250         BestKind = Kind;
8251         break;
8252       }
8253     }
8254   }
8255   return BestKind;
8256 }
8257 
8258 enum AbsoluteValueKind {
8259   AVK_Integer,
8260   AVK_Floating,
8261   AVK_Complex
8262 };
8263 
8264 static AbsoluteValueKind getAbsoluteValueKind(QualType T) {
8265   if (T->isIntegralOrEnumerationType())
8266     return AVK_Integer;
8267   if (T->isRealFloatingType())
8268     return AVK_Floating;
8269   if (T->isAnyComplexType())
8270     return AVK_Complex;
8271 
8272   llvm_unreachable("Type not integer, floating, or complex");
8273 }
8274 
8275 // Changes the absolute value function to a different type.  Preserves whether
8276 // the function is a builtin.
8277 static unsigned changeAbsFunction(unsigned AbsKind,
8278                                   AbsoluteValueKind ValueKind) {
8279   switch (ValueKind) {
8280   case AVK_Integer:
8281     switch (AbsKind) {
8282     default:
8283       return 0;
8284     case Builtin::BI__builtin_fabsf:
8285     case Builtin::BI__builtin_fabs:
8286     case Builtin::BI__builtin_fabsl:
8287     case Builtin::BI__builtin_cabsf:
8288     case Builtin::BI__builtin_cabs:
8289     case Builtin::BI__builtin_cabsl:
8290       return Builtin::BI__builtin_abs;
8291     case Builtin::BIfabsf:
8292     case Builtin::BIfabs:
8293     case Builtin::BIfabsl:
8294     case Builtin::BIcabsf:
8295     case Builtin::BIcabs:
8296     case Builtin::BIcabsl:
8297       return Builtin::BIabs;
8298     }
8299   case AVK_Floating:
8300     switch (AbsKind) {
8301     default:
8302       return 0;
8303     case Builtin::BI__builtin_abs:
8304     case Builtin::BI__builtin_labs:
8305     case Builtin::BI__builtin_llabs:
8306     case Builtin::BI__builtin_cabsf:
8307     case Builtin::BI__builtin_cabs:
8308     case Builtin::BI__builtin_cabsl:
8309       return Builtin::BI__builtin_fabsf;
8310     case Builtin::BIabs:
8311     case Builtin::BIlabs:
8312     case Builtin::BIllabs:
8313     case Builtin::BIcabsf:
8314     case Builtin::BIcabs:
8315     case Builtin::BIcabsl:
8316       return Builtin::BIfabsf;
8317     }
8318   case AVK_Complex:
8319     switch (AbsKind) {
8320     default:
8321       return 0;
8322     case Builtin::BI__builtin_abs:
8323     case Builtin::BI__builtin_labs:
8324     case Builtin::BI__builtin_llabs:
8325     case Builtin::BI__builtin_fabsf:
8326     case Builtin::BI__builtin_fabs:
8327     case Builtin::BI__builtin_fabsl:
8328       return Builtin::BI__builtin_cabsf;
8329     case Builtin::BIabs:
8330     case Builtin::BIlabs:
8331     case Builtin::BIllabs:
8332     case Builtin::BIfabsf:
8333     case Builtin::BIfabs:
8334     case Builtin::BIfabsl:
8335       return Builtin::BIcabsf;
8336     }
8337   }
8338   llvm_unreachable("Unable to convert function");
8339 }
8340 
8341 static unsigned getAbsoluteValueFunctionKind(const FunctionDecl *FDecl) {
8342   const IdentifierInfo *FnInfo = FDecl->getIdentifier();
8343   if (!FnInfo)
8344     return 0;
8345 
8346   switch (FDecl->getBuiltinID()) {
8347   default:
8348     return 0;
8349   case Builtin::BI__builtin_abs:
8350   case Builtin::BI__builtin_fabs:
8351   case Builtin::BI__builtin_fabsf:
8352   case Builtin::BI__builtin_fabsl:
8353   case Builtin::BI__builtin_labs:
8354   case Builtin::BI__builtin_llabs:
8355   case Builtin::BI__builtin_cabs:
8356   case Builtin::BI__builtin_cabsf:
8357   case Builtin::BI__builtin_cabsl:
8358   case Builtin::BIabs:
8359   case Builtin::BIlabs:
8360   case Builtin::BIllabs:
8361   case Builtin::BIfabs:
8362   case Builtin::BIfabsf:
8363   case Builtin::BIfabsl:
8364   case Builtin::BIcabs:
8365   case Builtin::BIcabsf:
8366   case Builtin::BIcabsl:
8367     return FDecl->getBuiltinID();
8368   }
8369   llvm_unreachable("Unknown Builtin type");
8370 }
8371 
8372 // If the replacement is valid, emit a note with replacement function.
8373 // Additionally, suggest including the proper header if not already included.
8374 static void emitReplacement(Sema &S, SourceLocation Loc, SourceRange Range,
8375                             unsigned AbsKind, QualType ArgType) {
8376   bool EmitHeaderHint = true;
8377   const char *HeaderName = nullptr;
8378   const char *FunctionName = nullptr;
8379   if (S.getLangOpts().CPlusPlus && !ArgType->isAnyComplexType()) {
8380     FunctionName = "std::abs";
8381     if (ArgType->isIntegralOrEnumerationType()) {
8382       HeaderName = "cstdlib";
8383     } else if (ArgType->isRealFloatingType()) {
8384       HeaderName = "cmath";
8385     } else {
8386       llvm_unreachable("Invalid Type");
8387     }
8388 
8389     // Lookup all std::abs
8390     if (NamespaceDecl *Std = S.getStdNamespace()) {
8391       LookupResult R(S, &S.Context.Idents.get("abs"), Loc, Sema::LookupAnyName);
8392       R.suppressDiagnostics();
8393       S.LookupQualifiedName(R, Std);
8394 
8395       for (const auto *I : R) {
8396         const FunctionDecl *FDecl = nullptr;
8397         if (const UsingShadowDecl *UsingD = dyn_cast<UsingShadowDecl>(I)) {
8398           FDecl = dyn_cast<FunctionDecl>(UsingD->getTargetDecl());
8399         } else {
8400           FDecl = dyn_cast<FunctionDecl>(I);
8401         }
8402         if (!FDecl)
8403           continue;
8404 
8405         // Found std::abs(), check that they are the right ones.
8406         if (FDecl->getNumParams() != 1)
8407           continue;
8408 
8409         // Check that the parameter type can handle the argument.
8410         QualType ParamType = FDecl->getParamDecl(0)->getType();
8411         if (getAbsoluteValueKind(ArgType) == getAbsoluteValueKind(ParamType) &&
8412             S.Context.getTypeSize(ArgType) <=
8413                 S.Context.getTypeSize(ParamType)) {
8414           // Found a function, don't need the header hint.
8415           EmitHeaderHint = false;
8416           break;
8417         }
8418       }
8419     }
8420   } else {
8421     FunctionName = S.Context.BuiltinInfo.getName(AbsKind);
8422     HeaderName = S.Context.BuiltinInfo.getHeaderName(AbsKind);
8423 
8424     if (HeaderName) {
8425       DeclarationName DN(&S.Context.Idents.get(FunctionName));
8426       LookupResult R(S, DN, Loc, Sema::LookupAnyName);
8427       R.suppressDiagnostics();
8428       S.LookupName(R, S.getCurScope());
8429 
8430       if (R.isSingleResult()) {
8431         FunctionDecl *FD = dyn_cast<FunctionDecl>(R.getFoundDecl());
8432         if (FD && FD->getBuiltinID() == AbsKind) {
8433           EmitHeaderHint = false;
8434         } else {
8435           return;
8436         }
8437       } else if (!R.empty()) {
8438         return;
8439       }
8440     }
8441   }
8442 
8443   S.Diag(Loc, diag::note_replace_abs_function)
8444       << FunctionName << FixItHint::CreateReplacement(Range, FunctionName);
8445 
8446   if (!HeaderName)
8447     return;
8448 
8449   if (!EmitHeaderHint)
8450     return;
8451 
8452   S.Diag(Loc, diag::note_include_header_or_declare) << HeaderName
8453                                                     << FunctionName;
8454 }
8455 
8456 template <std::size_t StrLen>
8457 static bool IsStdFunction(const FunctionDecl *FDecl,
8458                           const char (&Str)[StrLen]) {
8459   if (!FDecl)
8460     return false;
8461   if (!FDecl->getIdentifier() || !FDecl->getIdentifier()->isStr(Str))
8462     return false;
8463   if (!FDecl->isInStdNamespace())
8464     return false;
8465 
8466   return true;
8467 }
8468 
8469 // Warn when using the wrong abs() function.
8470 void Sema::CheckAbsoluteValueFunction(const CallExpr *Call,
8471                                       const FunctionDecl *FDecl) {
8472   if (Call->getNumArgs() != 1)
8473     return;
8474 
8475   unsigned AbsKind = getAbsoluteValueFunctionKind(FDecl);
8476   bool IsStdAbs = IsStdFunction(FDecl, "abs");
8477   if (AbsKind == 0 && !IsStdAbs)
8478     return;
8479 
8480   QualType ArgType = Call->getArg(0)->IgnoreParenImpCasts()->getType();
8481   QualType ParamType = Call->getArg(0)->getType();
8482 
8483   // Unsigned types cannot be negative.  Suggest removing the absolute value
8484   // function call.
8485   if (ArgType->isUnsignedIntegerType()) {
8486     const char *FunctionName =
8487         IsStdAbs ? "std::abs" : Context.BuiltinInfo.getName(AbsKind);
8488     Diag(Call->getExprLoc(), diag::warn_unsigned_abs) << ArgType << ParamType;
8489     Diag(Call->getExprLoc(), diag::note_remove_abs)
8490         << FunctionName
8491         << FixItHint::CreateRemoval(Call->getCallee()->getSourceRange());
8492     return;
8493   }
8494 
8495   // Taking the absolute value of a pointer is very suspicious, they probably
8496   // wanted to index into an array, dereference a pointer, call a function, etc.
8497   if (ArgType->isPointerType() || ArgType->canDecayToPointerType()) {
8498     unsigned DiagType = 0;
8499     if (ArgType->isFunctionType())
8500       DiagType = 1;
8501     else if (ArgType->isArrayType())
8502       DiagType = 2;
8503 
8504     Diag(Call->getExprLoc(), diag::warn_pointer_abs) << DiagType << ArgType;
8505     return;
8506   }
8507 
8508   // std::abs has overloads which prevent most of the absolute value problems
8509   // from occurring.
8510   if (IsStdAbs)
8511     return;
8512 
8513   AbsoluteValueKind ArgValueKind = getAbsoluteValueKind(ArgType);
8514   AbsoluteValueKind ParamValueKind = getAbsoluteValueKind(ParamType);
8515 
8516   // The argument and parameter are the same kind.  Check if they are the right
8517   // size.
8518   if (ArgValueKind == ParamValueKind) {
8519     if (Context.getTypeSize(ArgType) <= Context.getTypeSize(ParamType))
8520       return;
8521 
8522     unsigned NewAbsKind = getBestAbsFunction(Context, ArgType, AbsKind);
8523     Diag(Call->getExprLoc(), diag::warn_abs_too_small)
8524         << FDecl << ArgType << ParamType;
8525 
8526     if (NewAbsKind == 0)
8527       return;
8528 
8529     emitReplacement(*this, Call->getExprLoc(),
8530                     Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
8531     return;
8532   }
8533 
8534   // ArgValueKind != ParamValueKind
8535   // The wrong type of absolute value function was used.  Attempt to find the
8536   // proper one.
8537   unsigned NewAbsKind = changeAbsFunction(AbsKind, ArgValueKind);
8538   NewAbsKind = getBestAbsFunction(Context, ArgType, NewAbsKind);
8539   if (NewAbsKind == 0)
8540     return;
8541 
8542   Diag(Call->getExprLoc(), diag::warn_wrong_absolute_value_type)
8543       << FDecl << ParamValueKind << ArgValueKind;
8544 
8545   emitReplacement(*this, Call->getExprLoc(),
8546                   Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
8547 }
8548 
8549 //===--- CHECK: Warn on use of std::max and unsigned zero. r---------------===//
8550 void Sema::CheckMaxUnsignedZero(const CallExpr *Call,
8551                                 const FunctionDecl *FDecl) {
8552   if (!Call || !FDecl) return;
8553 
8554   // Ignore template specializations and macros.
8555   if (inTemplateInstantiation()) return;
8556   if (Call->getExprLoc().isMacroID()) return;
8557 
8558   // Only care about the one template argument, two function parameter std::max
8559   if (Call->getNumArgs() != 2) return;
8560   if (!IsStdFunction(FDecl, "max")) return;
8561   const auto * ArgList = FDecl->getTemplateSpecializationArgs();
8562   if (!ArgList) return;
8563   if (ArgList->size() != 1) return;
8564 
8565   // Check that template type argument is unsigned integer.
8566   const auto& TA = ArgList->get(0);
8567   if (TA.getKind() != TemplateArgument::Type) return;
8568   QualType ArgType = TA.getAsType();
8569   if (!ArgType->isUnsignedIntegerType()) return;
8570 
8571   // See if either argument is a literal zero.
8572   auto IsLiteralZeroArg = [](const Expr* E) -> bool {
8573     const auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E);
8574     if (!MTE) return false;
8575     const auto *Num = dyn_cast<IntegerLiteral>(MTE->GetTemporaryExpr());
8576     if (!Num) return false;
8577     if (Num->getValue() != 0) return false;
8578     return true;
8579   };
8580 
8581   const Expr *FirstArg = Call->getArg(0);
8582   const Expr *SecondArg = Call->getArg(1);
8583   const bool IsFirstArgZero = IsLiteralZeroArg(FirstArg);
8584   const bool IsSecondArgZero = IsLiteralZeroArg(SecondArg);
8585 
8586   // Only warn when exactly one argument is zero.
8587   if (IsFirstArgZero == IsSecondArgZero) return;
8588 
8589   SourceRange FirstRange = FirstArg->getSourceRange();
8590   SourceRange SecondRange = SecondArg->getSourceRange();
8591 
8592   SourceRange ZeroRange = IsFirstArgZero ? FirstRange : SecondRange;
8593 
8594   Diag(Call->getExprLoc(), diag::warn_max_unsigned_zero)
8595       << IsFirstArgZero << Call->getCallee()->getSourceRange() << ZeroRange;
8596 
8597   // Deduce what parts to remove so that "std::max(0u, foo)" becomes "(foo)".
8598   SourceRange RemovalRange;
8599   if (IsFirstArgZero) {
8600     RemovalRange = SourceRange(FirstRange.getBegin(),
8601                                SecondRange.getBegin().getLocWithOffset(-1));
8602   } else {
8603     RemovalRange = SourceRange(getLocForEndOfToken(FirstRange.getEnd()),
8604                                SecondRange.getEnd());
8605   }
8606 
8607   Diag(Call->getExprLoc(), diag::note_remove_max_call)
8608         << FixItHint::CreateRemoval(Call->getCallee()->getSourceRange())
8609         << FixItHint::CreateRemoval(RemovalRange);
8610 }
8611 
8612 //===--- CHECK: Standard memory functions ---------------------------------===//
8613 
8614 /// Takes the expression passed to the size_t parameter of functions
8615 /// such as memcmp, strncat, etc and warns if it's a comparison.
8616 ///
8617 /// This is to catch typos like `if (memcmp(&a, &b, sizeof(a) > 0))`.
8618 static bool CheckMemorySizeofForComparison(Sema &S, const Expr *E,
8619                                            IdentifierInfo *FnName,
8620                                            SourceLocation FnLoc,
8621                                            SourceLocation RParenLoc) {
8622   const BinaryOperator *Size = dyn_cast<BinaryOperator>(E);
8623   if (!Size)
8624     return false;
8625 
8626   // if E is binop and op is <=>, >, <, >=, <=, ==, &&, ||:
8627   if (!Size->isComparisonOp() && !Size->isLogicalOp())
8628     return false;
8629 
8630   SourceRange SizeRange = Size->getSourceRange();
8631   S.Diag(Size->getOperatorLoc(), diag::warn_memsize_comparison)
8632       << SizeRange << FnName;
8633   S.Diag(FnLoc, diag::note_memsize_comparison_paren)
8634       << FnName
8635       << FixItHint::CreateInsertion(
8636              S.getLocForEndOfToken(Size->getLHS()->getEndLoc()), ")")
8637       << FixItHint::CreateRemoval(RParenLoc);
8638   S.Diag(SizeRange.getBegin(), diag::note_memsize_comparison_cast_silence)
8639       << FixItHint::CreateInsertion(SizeRange.getBegin(), "(size_t)(")
8640       << FixItHint::CreateInsertion(S.getLocForEndOfToken(SizeRange.getEnd()),
8641                                     ")");
8642 
8643   return true;
8644 }
8645 
8646 /// Determine whether the given type is or contains a dynamic class type
8647 /// (e.g., whether it has a vtable).
8648 static const CXXRecordDecl *getContainedDynamicClass(QualType T,
8649                                                      bool &IsContained) {
8650   // Look through array types while ignoring qualifiers.
8651   const Type *Ty = T->getBaseElementTypeUnsafe();
8652   IsContained = false;
8653 
8654   const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
8655   RD = RD ? RD->getDefinition() : nullptr;
8656   if (!RD || RD->isInvalidDecl())
8657     return nullptr;
8658 
8659   if (RD->isDynamicClass())
8660     return RD;
8661 
8662   // Check all the fields.  If any bases were dynamic, the class is dynamic.
8663   // It's impossible for a class to transitively contain itself by value, so
8664   // infinite recursion is impossible.
8665   for (auto *FD : RD->fields()) {
8666     bool SubContained;
8667     if (const CXXRecordDecl *ContainedRD =
8668             getContainedDynamicClass(FD->getType(), SubContained)) {
8669       IsContained = true;
8670       return ContainedRD;
8671     }
8672   }
8673 
8674   return nullptr;
8675 }
8676 
8677 static const UnaryExprOrTypeTraitExpr *getAsSizeOfExpr(const Expr *E) {
8678   if (const auto *Unary = dyn_cast<UnaryExprOrTypeTraitExpr>(E))
8679     if (Unary->getKind() == UETT_SizeOf)
8680       return Unary;
8681   return nullptr;
8682 }
8683 
8684 /// If E is a sizeof expression, returns its argument expression,
8685 /// otherwise returns NULL.
8686 static const Expr *getSizeOfExprArg(const Expr *E) {
8687   if (const UnaryExprOrTypeTraitExpr *SizeOf = getAsSizeOfExpr(E))
8688     if (!SizeOf->isArgumentType())
8689       return SizeOf->getArgumentExpr()->IgnoreParenImpCasts();
8690   return nullptr;
8691 }
8692 
8693 /// If E is a sizeof expression, returns its argument type.
8694 static QualType getSizeOfArgType(const Expr *E) {
8695   if (const UnaryExprOrTypeTraitExpr *SizeOf = getAsSizeOfExpr(E))
8696     return SizeOf->getTypeOfArgument();
8697   return QualType();
8698 }
8699 
8700 namespace {
8701 
8702 struct SearchNonTrivialToInitializeField
8703     : DefaultInitializedTypeVisitor<SearchNonTrivialToInitializeField> {
8704   using Super =
8705       DefaultInitializedTypeVisitor<SearchNonTrivialToInitializeField>;
8706 
8707   SearchNonTrivialToInitializeField(const Expr *E, Sema &S) : E(E), S(S) {}
8708 
8709   void visitWithKind(QualType::PrimitiveDefaultInitializeKind PDIK, QualType FT,
8710                      SourceLocation SL) {
8711     if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
8712       asDerived().visitArray(PDIK, AT, SL);
8713       return;
8714     }
8715 
8716     Super::visitWithKind(PDIK, FT, SL);
8717   }
8718 
8719   void visitARCStrong(QualType FT, SourceLocation SL) {
8720     S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 1);
8721   }
8722   void visitARCWeak(QualType FT, SourceLocation SL) {
8723     S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 1);
8724   }
8725   void visitStruct(QualType FT, SourceLocation SL) {
8726     for (const FieldDecl *FD : FT->castAs<RecordType>()->getDecl()->fields())
8727       visit(FD->getType(), FD->getLocation());
8728   }
8729   void visitArray(QualType::PrimitiveDefaultInitializeKind PDIK,
8730                   const ArrayType *AT, SourceLocation SL) {
8731     visit(getContext().getBaseElementType(AT), SL);
8732   }
8733   void visitTrivial(QualType FT, SourceLocation SL) {}
8734 
8735   static void diag(QualType RT, const Expr *E, Sema &S) {
8736     SearchNonTrivialToInitializeField(E, S).visitStruct(RT, SourceLocation());
8737   }
8738 
8739   ASTContext &getContext() { return S.getASTContext(); }
8740 
8741   const Expr *E;
8742   Sema &S;
8743 };
8744 
8745 struct SearchNonTrivialToCopyField
8746     : CopiedTypeVisitor<SearchNonTrivialToCopyField, false> {
8747   using Super = CopiedTypeVisitor<SearchNonTrivialToCopyField, false>;
8748 
8749   SearchNonTrivialToCopyField(const Expr *E, Sema &S) : E(E), S(S) {}
8750 
8751   void visitWithKind(QualType::PrimitiveCopyKind PCK, QualType FT,
8752                      SourceLocation SL) {
8753     if (const auto *AT = asDerived().getContext().getAsArrayType(FT)) {
8754       asDerived().visitArray(PCK, AT, SL);
8755       return;
8756     }
8757 
8758     Super::visitWithKind(PCK, FT, SL);
8759   }
8760 
8761   void visitARCStrong(QualType FT, SourceLocation SL) {
8762     S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 0);
8763   }
8764   void visitARCWeak(QualType FT, SourceLocation SL) {
8765     S.DiagRuntimeBehavior(SL, E, S.PDiag(diag::note_nontrivial_field) << 0);
8766   }
8767   void visitStruct(QualType FT, SourceLocation SL) {
8768     for (const FieldDecl *FD : FT->castAs<RecordType>()->getDecl()->fields())
8769       visit(FD->getType(), FD->getLocation());
8770   }
8771   void visitArray(QualType::PrimitiveCopyKind PCK, const ArrayType *AT,
8772                   SourceLocation SL) {
8773     visit(getContext().getBaseElementType(AT), SL);
8774   }
8775   void preVisit(QualType::PrimitiveCopyKind PCK, QualType FT,
8776                 SourceLocation SL) {}
8777   void visitTrivial(QualType FT, SourceLocation SL) {}
8778   void visitVolatileTrivial(QualType FT, SourceLocation SL) {}
8779 
8780   static void diag(QualType RT, const Expr *E, Sema &S) {
8781     SearchNonTrivialToCopyField(E, S).visitStruct(RT, SourceLocation());
8782   }
8783 
8784   ASTContext &getContext() { return S.getASTContext(); }
8785 
8786   const Expr *E;
8787   Sema &S;
8788 };
8789 
8790 }
8791 
8792 /// Detect if \c SizeofExpr is likely to calculate the sizeof an object.
8793 static bool doesExprLikelyComputeSize(const Expr *SizeofExpr) {
8794   SizeofExpr = SizeofExpr->IgnoreParenImpCasts();
8795 
8796   if (const auto *BO = dyn_cast<BinaryOperator>(SizeofExpr)) {
8797     if (BO->getOpcode() != BO_Mul && BO->getOpcode() != BO_Add)
8798       return false;
8799 
8800     return doesExprLikelyComputeSize(BO->getLHS()) ||
8801            doesExprLikelyComputeSize(BO->getRHS());
8802   }
8803 
8804   return getAsSizeOfExpr(SizeofExpr) != nullptr;
8805 }
8806 
8807 /// Check if the ArgLoc originated from a macro passed to the call at CallLoc.
8808 ///
8809 /// \code
8810 ///   #define MACRO 0
8811 ///   foo(MACRO);
8812 ///   foo(0);
8813 /// \endcode
8814 ///
8815 /// This should return true for the first call to foo, but not for the second
8816 /// (regardless of whether foo is a macro or function).
8817 static bool isArgumentExpandedFromMacro(SourceManager &SM,
8818                                         SourceLocation CallLoc,
8819                                         SourceLocation ArgLoc) {
8820   if (!CallLoc.isMacroID())
8821     return SM.getFileID(CallLoc) != SM.getFileID(ArgLoc);
8822 
8823   return SM.getFileID(SM.getImmediateMacroCallerLoc(CallLoc)) !=
8824          SM.getFileID(SM.getImmediateMacroCallerLoc(ArgLoc));
8825 }
8826 
8827 /// Diagnose cases like 'memset(buf, sizeof(buf), 0)', which should have the
8828 /// last two arguments transposed.
8829 static void CheckMemaccessSize(Sema &S, unsigned BId, const CallExpr *Call) {
8830   if (BId != Builtin::BImemset && BId != Builtin::BIbzero)
8831     return;
8832 
8833   const Expr *SizeArg =
8834     Call->getArg(BId == Builtin::BImemset ? 2 : 1)->IgnoreImpCasts();
8835 
8836   auto isLiteralZero = [](const Expr *E) {
8837     return isa<IntegerLiteral>(E) && cast<IntegerLiteral>(E)->getValue() == 0;
8838   };
8839 
8840   // If we're memsetting or bzeroing 0 bytes, then this is likely an error.
8841   SourceLocation CallLoc = Call->getRParenLoc();
8842   SourceManager &SM = S.getSourceManager();
8843   if (isLiteralZero(SizeArg) &&
8844       !isArgumentExpandedFromMacro(SM, CallLoc, SizeArg->getExprLoc())) {
8845 
8846     SourceLocation DiagLoc = SizeArg->getExprLoc();
8847 
8848     // Some platforms #define bzero to __builtin_memset. See if this is the
8849     // case, and if so, emit a better diagnostic.
8850     if (BId == Builtin::BIbzero ||
8851         (CallLoc.isMacroID() && Lexer::getImmediateMacroName(
8852                                     CallLoc, SM, S.getLangOpts()) == "bzero")) {
8853       S.Diag(DiagLoc, diag::warn_suspicious_bzero_size);
8854       S.Diag(DiagLoc, diag::note_suspicious_bzero_size_silence);
8855     } else if (!isLiteralZero(Call->getArg(1)->IgnoreImpCasts())) {
8856       S.Diag(DiagLoc, diag::warn_suspicious_sizeof_memset) << 0;
8857       S.Diag(DiagLoc, diag::note_suspicious_sizeof_memset_silence) << 0;
8858     }
8859     return;
8860   }
8861 
8862   // If the second argument to a memset is a sizeof expression and the third
8863   // isn't, this is also likely an error. This should catch
8864   // 'memset(buf, sizeof(buf), 0xff)'.
8865   if (BId == Builtin::BImemset &&
8866       doesExprLikelyComputeSize(Call->getArg(1)) &&
8867       !doesExprLikelyComputeSize(Call->getArg(2))) {
8868     SourceLocation DiagLoc = Call->getArg(1)->getExprLoc();
8869     S.Diag(DiagLoc, diag::warn_suspicious_sizeof_memset) << 1;
8870     S.Diag(DiagLoc, diag::note_suspicious_sizeof_memset_silence) << 1;
8871     return;
8872   }
8873 }
8874 
8875 /// Check for dangerous or invalid arguments to memset().
8876 ///
8877 /// This issues warnings on known problematic, dangerous or unspecified
8878 /// arguments to the standard 'memset', 'memcpy', 'memmove', and 'memcmp'
8879 /// function calls.
8880 ///
8881 /// \param Call The call expression to diagnose.
8882 void Sema::CheckMemaccessArguments(const CallExpr *Call,
8883                                    unsigned BId,
8884                                    IdentifierInfo *FnName) {
8885   assert(BId != 0);
8886 
8887   // It is possible to have a non-standard definition of memset.  Validate
8888   // we have enough arguments, and if not, abort further checking.
8889   unsigned ExpectedNumArgs =
8890       (BId == Builtin::BIstrndup || BId == Builtin::BIbzero ? 2 : 3);
8891   if (Call->getNumArgs() < ExpectedNumArgs)
8892     return;
8893 
8894   unsigned LastArg = (BId == Builtin::BImemset || BId == Builtin::BIbzero ||
8895                       BId == Builtin::BIstrndup ? 1 : 2);
8896   unsigned LenArg =
8897       (BId == Builtin::BIbzero || BId == Builtin::BIstrndup ? 1 : 2);
8898   const Expr *LenExpr = Call->getArg(LenArg)->IgnoreParenImpCasts();
8899 
8900   if (CheckMemorySizeofForComparison(*this, LenExpr, FnName,
8901                                      Call->getBeginLoc(), Call->getRParenLoc()))
8902     return;
8903 
8904   // Catch cases like 'memset(buf, sizeof(buf), 0)'.
8905   CheckMemaccessSize(*this, BId, Call);
8906 
8907   // We have special checking when the length is a sizeof expression.
8908   QualType SizeOfArgTy = getSizeOfArgType(LenExpr);
8909   const Expr *SizeOfArg = getSizeOfExprArg(LenExpr);
8910   llvm::FoldingSetNodeID SizeOfArgID;
8911 
8912   // Although widely used, 'bzero' is not a standard function. Be more strict
8913   // with the argument types before allowing diagnostics and only allow the
8914   // form bzero(ptr, sizeof(...)).
8915   QualType FirstArgTy = Call->getArg(0)->IgnoreParenImpCasts()->getType();
8916   if (BId == Builtin::BIbzero && !FirstArgTy->getAs<PointerType>())
8917     return;
8918 
8919   for (unsigned ArgIdx = 0; ArgIdx != LastArg; ++ArgIdx) {
8920     const Expr *Dest = Call->getArg(ArgIdx)->IgnoreParenImpCasts();
8921     SourceRange ArgRange = Call->getArg(ArgIdx)->getSourceRange();
8922 
8923     QualType DestTy = Dest->getType();
8924     QualType PointeeTy;
8925     if (const PointerType *DestPtrTy = DestTy->getAs<PointerType>()) {
8926       PointeeTy = DestPtrTy->getPointeeType();
8927 
8928       // Never warn about void type pointers. This can be used to suppress
8929       // false positives.
8930       if (PointeeTy->isVoidType())
8931         continue;
8932 
8933       // Catch "memset(p, 0, sizeof(p))" -- needs to be sizeof(*p). Do this by
8934       // actually comparing the expressions for equality. Because computing the
8935       // expression IDs can be expensive, we only do this if the diagnostic is
8936       // enabled.
8937       if (SizeOfArg &&
8938           !Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess,
8939                            SizeOfArg->getExprLoc())) {
8940         // We only compute IDs for expressions if the warning is enabled, and
8941         // cache the sizeof arg's ID.
8942         if (SizeOfArgID == llvm::FoldingSetNodeID())
8943           SizeOfArg->Profile(SizeOfArgID, Context, true);
8944         llvm::FoldingSetNodeID DestID;
8945         Dest->Profile(DestID, Context, true);
8946         if (DestID == SizeOfArgID) {
8947           // TODO: For strncpy() and friends, this could suggest sizeof(dst)
8948           //       over sizeof(src) as well.
8949           unsigned ActionIdx = 0; // Default is to suggest dereferencing.
8950           StringRef ReadableName = FnName->getName();
8951 
8952           if (const UnaryOperator *UnaryOp = dyn_cast<UnaryOperator>(Dest))
8953             if (UnaryOp->getOpcode() == UO_AddrOf)
8954               ActionIdx = 1; // If its an address-of operator, just remove it.
8955           if (!PointeeTy->isIncompleteType() &&
8956               (Context.getTypeSize(PointeeTy) == Context.getCharWidth()))
8957             ActionIdx = 2; // If the pointee's size is sizeof(char),
8958                            // suggest an explicit length.
8959 
8960           // If the function is defined as a builtin macro, do not show macro
8961           // expansion.
8962           SourceLocation SL = SizeOfArg->getExprLoc();
8963           SourceRange DSR = Dest->getSourceRange();
8964           SourceRange SSR = SizeOfArg->getSourceRange();
8965           SourceManager &SM = getSourceManager();
8966 
8967           if (SM.isMacroArgExpansion(SL)) {
8968             ReadableName = Lexer::getImmediateMacroName(SL, SM, LangOpts);
8969             SL = SM.getSpellingLoc(SL);
8970             DSR = SourceRange(SM.getSpellingLoc(DSR.getBegin()),
8971                              SM.getSpellingLoc(DSR.getEnd()));
8972             SSR = SourceRange(SM.getSpellingLoc(SSR.getBegin()),
8973                              SM.getSpellingLoc(SSR.getEnd()));
8974           }
8975 
8976           DiagRuntimeBehavior(SL, SizeOfArg,
8977                               PDiag(diag::warn_sizeof_pointer_expr_memaccess)
8978                                 << ReadableName
8979                                 << PointeeTy
8980                                 << DestTy
8981                                 << DSR
8982                                 << SSR);
8983           DiagRuntimeBehavior(SL, SizeOfArg,
8984                          PDiag(diag::warn_sizeof_pointer_expr_memaccess_note)
8985                                 << ActionIdx
8986                                 << SSR);
8987 
8988           break;
8989         }
8990       }
8991 
8992       // Also check for cases where the sizeof argument is the exact same
8993       // type as the memory argument, and where it points to a user-defined
8994       // record type.
8995       if (SizeOfArgTy != QualType()) {
8996         if (PointeeTy->isRecordType() &&
8997             Context.typesAreCompatible(SizeOfArgTy, DestTy)) {
8998           DiagRuntimeBehavior(LenExpr->getExprLoc(), Dest,
8999                               PDiag(diag::warn_sizeof_pointer_type_memaccess)
9000                                 << FnName << SizeOfArgTy << ArgIdx
9001                                 << PointeeTy << Dest->getSourceRange()
9002                                 << LenExpr->getSourceRange());
9003           break;
9004         }
9005       }
9006     } else if (DestTy->isArrayType()) {
9007       PointeeTy = DestTy;
9008     }
9009 
9010     if (PointeeTy == QualType())
9011       continue;
9012 
9013     // Always complain about dynamic classes.
9014     bool IsContained;
9015     if (const CXXRecordDecl *ContainedRD =
9016             getContainedDynamicClass(PointeeTy, IsContained)) {
9017 
9018       unsigned OperationType = 0;
9019       // "overwritten" if we're warning about the destination for any call
9020       // but memcmp; otherwise a verb appropriate to the call.
9021       if (ArgIdx != 0 || BId == Builtin::BImemcmp) {
9022         if (BId == Builtin::BImemcpy)
9023           OperationType = 1;
9024         else if(BId == Builtin::BImemmove)
9025           OperationType = 2;
9026         else if (BId == Builtin::BImemcmp)
9027           OperationType = 3;
9028       }
9029 
9030       DiagRuntimeBehavior(
9031         Dest->getExprLoc(), Dest,
9032         PDiag(diag::warn_dyn_class_memaccess)
9033           << (BId == Builtin::BImemcmp ? ArgIdx + 2 : ArgIdx)
9034           << FnName << IsContained << ContainedRD << OperationType
9035           << Call->getCallee()->getSourceRange());
9036     } else if (PointeeTy.hasNonTrivialObjCLifetime() &&
9037              BId != Builtin::BImemset)
9038       DiagRuntimeBehavior(
9039         Dest->getExprLoc(), Dest,
9040         PDiag(diag::warn_arc_object_memaccess)
9041           << ArgIdx << FnName << PointeeTy
9042           << Call->getCallee()->getSourceRange());
9043     else if (const auto *RT = PointeeTy->getAs<RecordType>()) {
9044       if ((BId == Builtin::BImemset || BId == Builtin::BIbzero) &&
9045           RT->getDecl()->isNonTrivialToPrimitiveDefaultInitialize()) {
9046         DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
9047                             PDiag(diag::warn_cstruct_memaccess)
9048                                 << ArgIdx << FnName << PointeeTy << 0);
9049         SearchNonTrivialToInitializeField::diag(PointeeTy, Dest, *this);
9050       } else if ((BId == Builtin::BImemcpy || BId == Builtin::BImemmove) &&
9051                  RT->getDecl()->isNonTrivialToPrimitiveCopy()) {
9052         DiagRuntimeBehavior(Dest->getExprLoc(), Dest,
9053                             PDiag(diag::warn_cstruct_memaccess)
9054                                 << ArgIdx << FnName << PointeeTy << 1);
9055         SearchNonTrivialToCopyField::diag(PointeeTy, Dest, *this);
9056       } else {
9057         continue;
9058       }
9059     } else
9060       continue;
9061 
9062     DiagRuntimeBehavior(
9063       Dest->getExprLoc(), Dest,
9064       PDiag(diag::note_bad_memaccess_silence)
9065         << FixItHint::CreateInsertion(ArgRange.getBegin(), "(void*)"));
9066     break;
9067   }
9068 }
9069 
9070 // A little helper routine: ignore addition and subtraction of integer literals.
9071 // This intentionally does not ignore all integer constant expressions because
9072 // we don't want to remove sizeof().
9073 static const Expr *ignoreLiteralAdditions(const Expr *Ex, ASTContext &Ctx) {
9074   Ex = Ex->IgnoreParenCasts();
9075 
9076   while (true) {
9077     const BinaryOperator * BO = dyn_cast<BinaryOperator>(Ex);
9078     if (!BO || !BO->isAdditiveOp())
9079       break;
9080 
9081     const Expr *RHS = BO->getRHS()->IgnoreParenCasts();
9082     const Expr *LHS = BO->getLHS()->IgnoreParenCasts();
9083 
9084     if (isa<IntegerLiteral>(RHS))
9085       Ex = LHS;
9086     else if (isa<IntegerLiteral>(LHS))
9087       Ex = RHS;
9088     else
9089       break;
9090   }
9091 
9092   return Ex;
9093 }
9094 
9095 static bool isConstantSizeArrayWithMoreThanOneElement(QualType Ty,
9096                                                       ASTContext &Context) {
9097   // Only handle constant-sized or VLAs, but not flexible members.
9098   if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(Ty)) {
9099     // Only issue the FIXIT for arrays of size > 1.
9100     if (CAT->getSize().getSExtValue() <= 1)
9101       return false;
9102   } else if (!Ty->isVariableArrayType()) {
9103     return false;
9104   }
9105   return true;
9106 }
9107 
9108 // Warn if the user has made the 'size' argument to strlcpy or strlcat
9109 // be the size of the source, instead of the destination.
9110 void Sema::CheckStrlcpycatArguments(const CallExpr *Call,
9111                                     IdentifierInfo *FnName) {
9112 
9113   // Don't crash if the user has the wrong number of arguments
9114   unsigned NumArgs = Call->getNumArgs();
9115   if ((NumArgs != 3) && (NumArgs != 4))
9116     return;
9117 
9118   const Expr *SrcArg = ignoreLiteralAdditions(Call->getArg(1), Context);
9119   const Expr *SizeArg = ignoreLiteralAdditions(Call->getArg(2), Context);
9120   const Expr *CompareWithSrc = nullptr;
9121 
9122   if (CheckMemorySizeofForComparison(*this, SizeArg, FnName,
9123                                      Call->getBeginLoc(), Call->getRParenLoc()))
9124     return;
9125 
9126   // Look for 'strlcpy(dst, x, sizeof(x))'
9127   if (const Expr *Ex = getSizeOfExprArg(SizeArg))
9128     CompareWithSrc = Ex;
9129   else {
9130     // Look for 'strlcpy(dst, x, strlen(x))'
9131     if (const CallExpr *SizeCall = dyn_cast<CallExpr>(SizeArg)) {
9132       if (SizeCall->getBuiltinCallee() == Builtin::BIstrlen &&
9133           SizeCall->getNumArgs() == 1)
9134         CompareWithSrc = ignoreLiteralAdditions(SizeCall->getArg(0), Context);
9135     }
9136   }
9137 
9138   if (!CompareWithSrc)
9139     return;
9140 
9141   // Determine if the argument to sizeof/strlen is equal to the source
9142   // argument.  In principle there's all kinds of things you could do
9143   // here, for instance creating an == expression and evaluating it with
9144   // EvaluateAsBooleanCondition, but this uses a more direct technique:
9145   const DeclRefExpr *SrcArgDRE = dyn_cast<DeclRefExpr>(SrcArg);
9146   if (!SrcArgDRE)
9147     return;
9148 
9149   const DeclRefExpr *CompareWithSrcDRE = dyn_cast<DeclRefExpr>(CompareWithSrc);
9150   if (!CompareWithSrcDRE ||
9151       SrcArgDRE->getDecl() != CompareWithSrcDRE->getDecl())
9152     return;
9153 
9154   const Expr *OriginalSizeArg = Call->getArg(2);
9155   Diag(CompareWithSrcDRE->getBeginLoc(), diag::warn_strlcpycat_wrong_size)
9156       << OriginalSizeArg->getSourceRange() << FnName;
9157 
9158   // Output a FIXIT hint if the destination is an array (rather than a
9159   // pointer to an array).  This could be enhanced to handle some
9160   // pointers if we know the actual size, like if DstArg is 'array+2'
9161   // we could say 'sizeof(array)-2'.
9162   const Expr *DstArg = Call->getArg(0)->IgnoreParenImpCasts();
9163   if (!isConstantSizeArrayWithMoreThanOneElement(DstArg->getType(), Context))
9164     return;
9165 
9166   SmallString<128> sizeString;
9167   llvm::raw_svector_ostream OS(sizeString);
9168   OS << "sizeof(";
9169   DstArg->printPretty(OS, nullptr, getPrintingPolicy());
9170   OS << ")";
9171 
9172   Diag(OriginalSizeArg->getBeginLoc(), diag::note_strlcpycat_wrong_size)
9173       << FixItHint::CreateReplacement(OriginalSizeArg->getSourceRange(),
9174                                       OS.str());
9175 }
9176 
9177 /// Check if two expressions refer to the same declaration.
9178 static bool referToTheSameDecl(const Expr *E1, const Expr *E2) {
9179   if (const DeclRefExpr *D1 = dyn_cast_or_null<DeclRefExpr>(E1))
9180     if (const DeclRefExpr *D2 = dyn_cast_or_null<DeclRefExpr>(E2))
9181       return D1->getDecl() == D2->getDecl();
9182   return false;
9183 }
9184 
9185 static const Expr *getStrlenExprArg(const Expr *E) {
9186   if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
9187     const FunctionDecl *FD = CE->getDirectCallee();
9188     if (!FD || FD->getMemoryFunctionKind() != Builtin::BIstrlen)
9189       return nullptr;
9190     return CE->getArg(0)->IgnoreParenCasts();
9191   }
9192   return nullptr;
9193 }
9194 
9195 // Warn on anti-patterns as the 'size' argument to strncat.
9196 // The correct size argument should look like following:
9197 //   strncat(dst, src, sizeof(dst) - strlen(dest) - 1);
9198 void Sema::CheckStrncatArguments(const CallExpr *CE,
9199                                  IdentifierInfo *FnName) {
9200   // Don't crash if the user has the wrong number of arguments.
9201   if (CE->getNumArgs() < 3)
9202     return;
9203   const Expr *DstArg = CE->getArg(0)->IgnoreParenCasts();
9204   const Expr *SrcArg = CE->getArg(1)->IgnoreParenCasts();
9205   const Expr *LenArg = CE->getArg(2)->IgnoreParenCasts();
9206 
9207   if (CheckMemorySizeofForComparison(*this, LenArg, FnName, CE->getBeginLoc(),
9208                                      CE->getRParenLoc()))
9209     return;
9210 
9211   // Identify common expressions, which are wrongly used as the size argument
9212   // to strncat and may lead to buffer overflows.
9213   unsigned PatternType = 0;
9214   if (const Expr *SizeOfArg = getSizeOfExprArg(LenArg)) {
9215     // - sizeof(dst)
9216     if (referToTheSameDecl(SizeOfArg, DstArg))
9217       PatternType = 1;
9218     // - sizeof(src)
9219     else if (referToTheSameDecl(SizeOfArg, SrcArg))
9220       PatternType = 2;
9221   } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(LenArg)) {
9222     if (BE->getOpcode() == BO_Sub) {
9223       const Expr *L = BE->getLHS()->IgnoreParenCasts();
9224       const Expr *R = BE->getRHS()->IgnoreParenCasts();
9225       // - sizeof(dst) - strlen(dst)
9226       if (referToTheSameDecl(DstArg, getSizeOfExprArg(L)) &&
9227           referToTheSameDecl(DstArg, getStrlenExprArg(R)))
9228         PatternType = 1;
9229       // - sizeof(src) - (anything)
9230       else if (referToTheSameDecl(SrcArg, getSizeOfExprArg(L)))
9231         PatternType = 2;
9232     }
9233   }
9234 
9235   if (PatternType == 0)
9236     return;
9237 
9238   // Generate the diagnostic.
9239   SourceLocation SL = LenArg->getBeginLoc();
9240   SourceRange SR = LenArg->getSourceRange();
9241   SourceManager &SM = getSourceManager();
9242 
9243   // If the function is defined as a builtin macro, do not show macro expansion.
9244   if (SM.isMacroArgExpansion(SL)) {
9245     SL = SM.getSpellingLoc(SL);
9246     SR = SourceRange(SM.getSpellingLoc(SR.getBegin()),
9247                      SM.getSpellingLoc(SR.getEnd()));
9248   }
9249 
9250   // Check if the destination is an array (rather than a pointer to an array).
9251   QualType DstTy = DstArg->getType();
9252   bool isKnownSizeArray = isConstantSizeArrayWithMoreThanOneElement(DstTy,
9253                                                                     Context);
9254   if (!isKnownSizeArray) {
9255     if (PatternType == 1)
9256       Diag(SL, diag::warn_strncat_wrong_size) << SR;
9257     else
9258       Diag(SL, diag::warn_strncat_src_size) << SR;
9259     return;
9260   }
9261 
9262   if (PatternType == 1)
9263     Diag(SL, diag::warn_strncat_large_size) << SR;
9264   else
9265     Diag(SL, diag::warn_strncat_src_size) << SR;
9266 
9267   SmallString<128> sizeString;
9268   llvm::raw_svector_ostream OS(sizeString);
9269   OS << "sizeof(";
9270   DstArg->printPretty(OS, nullptr, getPrintingPolicy());
9271   OS << ") - ";
9272   OS << "strlen(";
9273   DstArg->printPretty(OS, nullptr, getPrintingPolicy());
9274   OS << ") - 1";
9275 
9276   Diag(SL, diag::note_strncat_wrong_size)
9277     << FixItHint::CreateReplacement(SR, OS.str());
9278 }
9279 
9280 void
9281 Sema::CheckReturnValExpr(Expr *RetValExp, QualType lhsType,
9282                          SourceLocation ReturnLoc,
9283                          bool isObjCMethod,
9284                          const AttrVec *Attrs,
9285                          const FunctionDecl *FD) {
9286   // Check if the return value is null but should not be.
9287   if (((Attrs && hasSpecificAttr<ReturnsNonNullAttr>(*Attrs)) ||
9288        (!isObjCMethod && isNonNullType(Context, lhsType))) &&
9289       CheckNonNullExpr(*this, RetValExp))
9290     Diag(ReturnLoc, diag::warn_null_ret)
9291       << (isObjCMethod ? 1 : 0) << RetValExp->getSourceRange();
9292 
9293   // C++11 [basic.stc.dynamic.allocation]p4:
9294   //   If an allocation function declared with a non-throwing
9295   //   exception-specification fails to allocate storage, it shall return
9296   //   a null pointer. Any other allocation function that fails to allocate
9297   //   storage shall indicate failure only by throwing an exception [...]
9298   if (FD) {
9299     OverloadedOperatorKind Op = FD->getOverloadedOperator();
9300     if (Op == OO_New || Op == OO_Array_New) {
9301       const FunctionProtoType *Proto
9302         = FD->getType()->castAs<FunctionProtoType>();
9303       if (!Proto->isNothrow(/*ResultIfDependent*/true) &&
9304           CheckNonNullExpr(*this, RetValExp))
9305         Diag(ReturnLoc, diag::warn_operator_new_returns_null)
9306           << FD << getLangOpts().CPlusPlus11;
9307     }
9308   }
9309 }
9310 
9311 //===--- CHECK: Floating-Point comparisons (-Wfloat-equal) ---------------===//
9312 
9313 /// Check for comparisons of floating point operands using != and ==.
9314 /// Issue a warning if these are no self-comparisons, as they are not likely
9315 /// to do what the programmer intended.
9316 void Sema::CheckFloatComparison(SourceLocation Loc, Expr* LHS, Expr *RHS) {
9317   Expr* LeftExprSansParen = LHS->IgnoreParenImpCasts();
9318   Expr* RightExprSansParen = RHS->IgnoreParenImpCasts();
9319 
9320   // Special case: check for x == x (which is OK).
9321   // Do not emit warnings for such cases.
9322   if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LeftExprSansParen))
9323     if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RightExprSansParen))
9324       if (DRL->getDecl() == DRR->getDecl())
9325         return;
9326 
9327   // Special case: check for comparisons against literals that can be exactly
9328   //  represented by APFloat.  In such cases, do not emit a warning.  This
9329   //  is a heuristic: often comparison against such literals are used to
9330   //  detect if a value in a variable has not changed.  This clearly can
9331   //  lead to false negatives.
9332   if (FloatingLiteral* FLL = dyn_cast<FloatingLiteral>(LeftExprSansParen)) {
9333     if (FLL->isExact())
9334       return;
9335   } else
9336     if (FloatingLiteral* FLR = dyn_cast<FloatingLiteral>(RightExprSansParen))
9337       if (FLR->isExact())
9338         return;
9339 
9340   // Check for comparisons with builtin types.
9341   if (CallExpr* CL = dyn_cast<CallExpr>(LeftExprSansParen))
9342     if (CL->getBuiltinCallee())
9343       return;
9344 
9345   if (CallExpr* CR = dyn_cast<CallExpr>(RightExprSansParen))
9346     if (CR->getBuiltinCallee())
9347       return;
9348 
9349   // Emit the diagnostic.
9350   Diag(Loc, diag::warn_floatingpoint_eq)
9351     << LHS->getSourceRange() << RHS->getSourceRange();
9352 }
9353 
9354 //===--- CHECK: Integer mixed-sign comparisons (-Wsign-compare) --------===//
9355 //===--- CHECK: Lossy implicit conversions (-Wconversion) --------------===//
9356 
9357 namespace {
9358 
9359 /// Structure recording the 'active' range of an integer-valued
9360 /// expression.
9361 struct IntRange {
9362   /// The number of bits active in the int.
9363   unsigned Width;
9364 
9365   /// True if the int is known not to have negative values.
9366   bool NonNegative;
9367 
9368   IntRange(unsigned Width, bool NonNegative)
9369       : Width(Width), NonNegative(NonNegative) {}
9370 
9371   /// Returns the range of the bool type.
9372   static IntRange forBoolType() {
9373     return IntRange(1, true);
9374   }
9375 
9376   /// Returns the range of an opaque value of the given integral type.
9377   static IntRange forValueOfType(ASTContext &C, QualType T) {
9378     return forValueOfCanonicalType(C,
9379                           T->getCanonicalTypeInternal().getTypePtr());
9380   }
9381 
9382   /// Returns the range of an opaque value of a canonical integral type.
9383   static IntRange forValueOfCanonicalType(ASTContext &C, const Type *T) {
9384     assert(T->isCanonicalUnqualified());
9385 
9386     if (const VectorType *VT = dyn_cast<VectorType>(T))
9387       T = VT->getElementType().getTypePtr();
9388     if (const ComplexType *CT = dyn_cast<ComplexType>(T))
9389       T = CT->getElementType().getTypePtr();
9390     if (const AtomicType *AT = dyn_cast<AtomicType>(T))
9391       T = AT->getValueType().getTypePtr();
9392 
9393     if (!C.getLangOpts().CPlusPlus) {
9394       // For enum types in C code, use the underlying datatype.
9395       if (const EnumType *ET = dyn_cast<EnumType>(T))
9396         T = ET->getDecl()->getIntegerType().getDesugaredType(C).getTypePtr();
9397     } else if (const EnumType *ET = dyn_cast<EnumType>(T)) {
9398       // For enum types in C++, use the known bit width of the enumerators.
9399       EnumDecl *Enum = ET->getDecl();
9400       // In C++11, enums can have a fixed underlying type. Use this type to
9401       // compute the range.
9402       if (Enum->isFixed()) {
9403         return IntRange(C.getIntWidth(QualType(T, 0)),
9404                         !ET->isSignedIntegerOrEnumerationType());
9405       }
9406 
9407       unsigned NumPositive = Enum->getNumPositiveBits();
9408       unsigned NumNegative = Enum->getNumNegativeBits();
9409 
9410       if (NumNegative == 0)
9411         return IntRange(NumPositive, true/*NonNegative*/);
9412       else
9413         return IntRange(std::max(NumPositive + 1, NumNegative),
9414                         false/*NonNegative*/);
9415     }
9416 
9417     const BuiltinType *BT = cast<BuiltinType>(T);
9418     assert(BT->isInteger());
9419 
9420     return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
9421   }
9422 
9423   /// Returns the "target" range of a canonical integral type, i.e.
9424   /// the range of values expressible in the type.
9425   ///
9426   /// This matches forValueOfCanonicalType except that enums have the
9427   /// full range of their type, not the range of their enumerators.
9428   static IntRange forTargetOfCanonicalType(ASTContext &C, const Type *T) {
9429     assert(T->isCanonicalUnqualified());
9430 
9431     if (const VectorType *VT = dyn_cast<VectorType>(T))
9432       T = VT->getElementType().getTypePtr();
9433     if (const ComplexType *CT = dyn_cast<ComplexType>(T))
9434       T = CT->getElementType().getTypePtr();
9435     if (const AtomicType *AT = dyn_cast<AtomicType>(T))
9436       T = AT->getValueType().getTypePtr();
9437     if (const EnumType *ET = dyn_cast<EnumType>(T))
9438       T = C.getCanonicalType(ET->getDecl()->getIntegerType()).getTypePtr();
9439 
9440     const BuiltinType *BT = cast<BuiltinType>(T);
9441     assert(BT->isInteger());
9442 
9443     return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
9444   }
9445 
9446   /// Returns the supremum of two ranges: i.e. their conservative merge.
9447   static IntRange join(IntRange L, IntRange R) {
9448     return IntRange(std::max(L.Width, R.Width),
9449                     L.NonNegative && R.NonNegative);
9450   }
9451 
9452   /// Returns the infinum of two ranges: i.e. their aggressive merge.
9453   static IntRange meet(IntRange L, IntRange R) {
9454     return IntRange(std::min(L.Width, R.Width),
9455                     L.NonNegative || R.NonNegative);
9456   }
9457 };
9458 
9459 } // namespace
9460 
9461 static IntRange GetValueRange(ASTContext &C, llvm::APSInt &value,
9462                               unsigned MaxWidth) {
9463   if (value.isSigned() && value.isNegative())
9464     return IntRange(value.getMinSignedBits(), false);
9465 
9466   if (value.getBitWidth() > MaxWidth)
9467     value = value.trunc(MaxWidth);
9468 
9469   // isNonNegative() just checks the sign bit without considering
9470   // signedness.
9471   return IntRange(value.getActiveBits(), true);
9472 }
9473 
9474 static IntRange GetValueRange(ASTContext &C, APValue &result, QualType Ty,
9475                               unsigned MaxWidth) {
9476   if (result.isInt())
9477     return GetValueRange(C, result.getInt(), MaxWidth);
9478 
9479   if (result.isVector()) {
9480     IntRange R = GetValueRange(C, result.getVectorElt(0), Ty, MaxWidth);
9481     for (unsigned i = 1, e = result.getVectorLength(); i != e; ++i) {
9482       IntRange El = GetValueRange(C, result.getVectorElt(i), Ty, MaxWidth);
9483       R = IntRange::join(R, El);
9484     }
9485     return R;
9486   }
9487 
9488   if (result.isComplexInt()) {
9489     IntRange R = GetValueRange(C, result.getComplexIntReal(), MaxWidth);
9490     IntRange I = GetValueRange(C, result.getComplexIntImag(), MaxWidth);
9491     return IntRange::join(R, I);
9492   }
9493 
9494   // This can happen with lossless casts to intptr_t of "based" lvalues.
9495   // Assume it might use arbitrary bits.
9496   // FIXME: The only reason we need to pass the type in here is to get
9497   // the sign right on this one case.  It would be nice if APValue
9498   // preserved this.
9499   assert(result.isLValue() || result.isAddrLabelDiff());
9500   return IntRange(MaxWidth, Ty->isUnsignedIntegerOrEnumerationType());
9501 }
9502 
9503 static QualType GetExprType(const Expr *E) {
9504   QualType Ty = E->getType();
9505   if (const AtomicType *AtomicRHS = Ty->getAs<AtomicType>())
9506     Ty = AtomicRHS->getValueType();
9507   return Ty;
9508 }
9509 
9510 /// Pseudo-evaluate the given integer expression, estimating the
9511 /// range of values it might take.
9512 ///
9513 /// \param MaxWidth - the width to which the value will be truncated
9514 static IntRange GetExprRange(ASTContext &C, const Expr *E, unsigned MaxWidth) {
9515   E = E->IgnoreParens();
9516 
9517   // Try a full evaluation first.
9518   Expr::EvalResult result;
9519   if (E->EvaluateAsRValue(result, C))
9520     return GetValueRange(C, result.Val, GetExprType(E), MaxWidth);
9521 
9522   // I think we only want to look through implicit casts here; if the
9523   // user has an explicit widening cast, we should treat the value as
9524   // being of the new, wider type.
9525   if (const auto *CE = dyn_cast<ImplicitCastExpr>(E)) {
9526     if (CE->getCastKind() == CK_NoOp || CE->getCastKind() == CK_LValueToRValue)
9527       return GetExprRange(C, CE->getSubExpr(), MaxWidth);
9528 
9529     IntRange OutputTypeRange = IntRange::forValueOfType(C, GetExprType(CE));
9530 
9531     bool isIntegerCast = CE->getCastKind() == CK_IntegralCast ||
9532                          CE->getCastKind() == CK_BooleanToSignedIntegral;
9533 
9534     // Assume that non-integer casts can span the full range of the type.
9535     if (!isIntegerCast)
9536       return OutputTypeRange;
9537 
9538     IntRange SubRange
9539       = GetExprRange(C, CE->getSubExpr(),
9540                      std::min(MaxWidth, OutputTypeRange.Width));
9541 
9542     // Bail out if the subexpr's range is as wide as the cast type.
9543     if (SubRange.Width >= OutputTypeRange.Width)
9544       return OutputTypeRange;
9545 
9546     // Otherwise, we take the smaller width, and we're non-negative if
9547     // either the output type or the subexpr is.
9548     return IntRange(SubRange.Width,
9549                     SubRange.NonNegative || OutputTypeRange.NonNegative);
9550   }
9551 
9552   if (const auto *CO = dyn_cast<ConditionalOperator>(E)) {
9553     // If we can fold the condition, just take that operand.
9554     bool CondResult;
9555     if (CO->getCond()->EvaluateAsBooleanCondition(CondResult, C))
9556       return GetExprRange(C, CondResult ? CO->getTrueExpr()
9557                                         : CO->getFalseExpr(),
9558                           MaxWidth);
9559 
9560     // Otherwise, conservatively merge.
9561     IntRange L = GetExprRange(C, CO->getTrueExpr(), MaxWidth);
9562     IntRange R = GetExprRange(C, CO->getFalseExpr(), MaxWidth);
9563     return IntRange::join(L, R);
9564   }
9565 
9566   if (const auto *BO = dyn_cast<BinaryOperator>(E)) {
9567     switch (BO->getOpcode()) {
9568     case BO_Cmp:
9569       llvm_unreachable("builtin <=> should have class type");
9570 
9571     // Boolean-valued operations are single-bit and positive.
9572     case BO_LAnd:
9573     case BO_LOr:
9574     case BO_LT:
9575     case BO_GT:
9576     case BO_LE:
9577     case BO_GE:
9578     case BO_EQ:
9579     case BO_NE:
9580       return IntRange::forBoolType();
9581 
9582     // The type of the assignments is the type of the LHS, so the RHS
9583     // is not necessarily the same type.
9584     case BO_MulAssign:
9585     case BO_DivAssign:
9586     case BO_RemAssign:
9587     case BO_AddAssign:
9588     case BO_SubAssign:
9589     case BO_XorAssign:
9590     case BO_OrAssign:
9591       // TODO: bitfields?
9592       return IntRange::forValueOfType(C, GetExprType(E));
9593 
9594     // Simple assignments just pass through the RHS, which will have
9595     // been coerced to the LHS type.
9596     case BO_Assign:
9597       // TODO: bitfields?
9598       return GetExprRange(C, BO->getRHS(), MaxWidth);
9599 
9600     // Operations with opaque sources are black-listed.
9601     case BO_PtrMemD:
9602     case BO_PtrMemI:
9603       return IntRange::forValueOfType(C, GetExprType(E));
9604 
9605     // Bitwise-and uses the *infinum* of the two source ranges.
9606     case BO_And:
9607     case BO_AndAssign:
9608       return IntRange::meet(GetExprRange(C, BO->getLHS(), MaxWidth),
9609                             GetExprRange(C, BO->getRHS(), MaxWidth));
9610 
9611     // Left shift gets black-listed based on a judgement call.
9612     case BO_Shl:
9613       // ...except that we want to treat '1 << (blah)' as logically
9614       // positive.  It's an important idiom.
9615       if (IntegerLiteral *I
9616             = dyn_cast<IntegerLiteral>(BO->getLHS()->IgnoreParenCasts())) {
9617         if (I->getValue() == 1) {
9618           IntRange R = IntRange::forValueOfType(C, GetExprType(E));
9619           return IntRange(R.Width, /*NonNegative*/ true);
9620         }
9621       }
9622       LLVM_FALLTHROUGH;
9623 
9624     case BO_ShlAssign:
9625       return IntRange::forValueOfType(C, GetExprType(E));
9626 
9627     // Right shift by a constant can narrow its left argument.
9628     case BO_Shr:
9629     case BO_ShrAssign: {
9630       IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth);
9631 
9632       // If the shift amount is a positive constant, drop the width by
9633       // that much.
9634       llvm::APSInt shift;
9635       if (BO->getRHS()->isIntegerConstantExpr(shift, C) &&
9636           shift.isNonNegative()) {
9637         unsigned zext = shift.getZExtValue();
9638         if (zext >= L.Width)
9639           L.Width = (L.NonNegative ? 0 : 1);
9640         else
9641           L.Width -= zext;
9642       }
9643 
9644       return L;
9645     }
9646 
9647     // Comma acts as its right operand.
9648     case BO_Comma:
9649       return GetExprRange(C, BO->getRHS(), MaxWidth);
9650 
9651     // Black-list pointer subtractions.
9652     case BO_Sub:
9653       if (BO->getLHS()->getType()->isPointerType())
9654         return IntRange::forValueOfType(C, GetExprType(E));
9655       break;
9656 
9657     // The width of a division result is mostly determined by the size
9658     // of the LHS.
9659     case BO_Div: {
9660       // Don't 'pre-truncate' the operands.
9661       unsigned opWidth = C.getIntWidth(GetExprType(E));
9662       IntRange L = GetExprRange(C, BO->getLHS(), opWidth);
9663 
9664       // If the divisor is constant, use that.
9665       llvm::APSInt divisor;
9666       if (BO->getRHS()->isIntegerConstantExpr(divisor, C)) {
9667         unsigned log2 = divisor.logBase2(); // floor(log_2(divisor))
9668         if (log2 >= L.Width)
9669           L.Width = (L.NonNegative ? 0 : 1);
9670         else
9671           L.Width = std::min(L.Width - log2, MaxWidth);
9672         return L;
9673       }
9674 
9675       // Otherwise, just use the LHS's width.
9676       IntRange R = GetExprRange(C, BO->getRHS(), opWidth);
9677       return IntRange(L.Width, L.NonNegative && R.NonNegative);
9678     }
9679 
9680     // The result of a remainder can't be larger than the result of
9681     // either side.
9682     case BO_Rem: {
9683       // Don't 'pre-truncate' the operands.
9684       unsigned opWidth = C.getIntWidth(GetExprType(E));
9685       IntRange L = GetExprRange(C, BO->getLHS(), opWidth);
9686       IntRange R = GetExprRange(C, BO->getRHS(), opWidth);
9687 
9688       IntRange meet = IntRange::meet(L, R);
9689       meet.Width = std::min(meet.Width, MaxWidth);
9690       return meet;
9691     }
9692 
9693     // The default behavior is okay for these.
9694     case BO_Mul:
9695     case BO_Add:
9696     case BO_Xor:
9697     case BO_Or:
9698       break;
9699     }
9700 
9701     // The default case is to treat the operation as if it were closed
9702     // on the narrowest type that encompasses both operands.
9703     IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth);
9704     IntRange R = GetExprRange(C, BO->getRHS(), MaxWidth);
9705     return IntRange::join(L, R);
9706   }
9707 
9708   if (const auto *UO = dyn_cast<UnaryOperator>(E)) {
9709     switch (UO->getOpcode()) {
9710     // Boolean-valued operations are white-listed.
9711     case UO_LNot:
9712       return IntRange::forBoolType();
9713 
9714     // Operations with opaque sources are black-listed.
9715     case UO_Deref:
9716     case UO_AddrOf: // should be impossible
9717       return IntRange::forValueOfType(C, GetExprType(E));
9718 
9719     default:
9720       return GetExprRange(C, UO->getSubExpr(), MaxWidth);
9721     }
9722   }
9723 
9724   if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E))
9725     return GetExprRange(C, OVE->getSourceExpr(), MaxWidth);
9726 
9727   if (const auto *BitField = E->getSourceBitField())
9728     return IntRange(BitField->getBitWidthValue(C),
9729                     BitField->getType()->isUnsignedIntegerOrEnumerationType());
9730 
9731   return IntRange::forValueOfType(C, GetExprType(E));
9732 }
9733 
9734 static IntRange GetExprRange(ASTContext &C, const Expr *E) {
9735   return GetExprRange(C, E, C.getIntWidth(GetExprType(E)));
9736 }
9737 
9738 /// Checks whether the given value, which currently has the given
9739 /// source semantics, has the same value when coerced through the
9740 /// target semantics.
9741 static bool IsSameFloatAfterCast(const llvm::APFloat &value,
9742                                  const llvm::fltSemantics &Src,
9743                                  const llvm::fltSemantics &Tgt) {
9744   llvm::APFloat truncated = value;
9745 
9746   bool ignored;
9747   truncated.convert(Src, llvm::APFloat::rmNearestTiesToEven, &ignored);
9748   truncated.convert(Tgt, llvm::APFloat::rmNearestTiesToEven, &ignored);
9749 
9750   return truncated.bitwiseIsEqual(value);
9751 }
9752 
9753 /// Checks whether the given value, which currently has the given
9754 /// source semantics, has the same value when coerced through the
9755 /// target semantics.
9756 ///
9757 /// The value might be a vector of floats (or a complex number).
9758 static bool IsSameFloatAfterCast(const APValue &value,
9759                                  const llvm::fltSemantics &Src,
9760                                  const llvm::fltSemantics &Tgt) {
9761   if (value.isFloat())
9762     return IsSameFloatAfterCast(value.getFloat(), Src, Tgt);
9763 
9764   if (value.isVector()) {
9765     for (unsigned i = 0, e = value.getVectorLength(); i != e; ++i)
9766       if (!IsSameFloatAfterCast(value.getVectorElt(i), Src, Tgt))
9767         return false;
9768     return true;
9769   }
9770 
9771   assert(value.isComplexFloat());
9772   return (IsSameFloatAfterCast(value.getComplexFloatReal(), Src, Tgt) &&
9773           IsSameFloatAfterCast(value.getComplexFloatImag(), Src, Tgt));
9774 }
9775 
9776 static void AnalyzeImplicitConversions(Sema &S, Expr *E, SourceLocation CC);
9777 
9778 static bool IsEnumConstOrFromMacro(Sema &S, Expr *E) {
9779   // Suppress cases where we are comparing against an enum constant.
9780   if (const DeclRefExpr *DR =
9781       dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts()))
9782     if (isa<EnumConstantDecl>(DR->getDecl()))
9783       return true;
9784 
9785   // Suppress cases where the '0' value is expanded from a macro.
9786   if (E->getBeginLoc().isMacroID())
9787     return true;
9788 
9789   return false;
9790 }
9791 
9792 static bool isKnownToHaveUnsignedValue(Expr *E) {
9793   return E->getType()->isIntegerType() &&
9794          (!E->getType()->isSignedIntegerType() ||
9795           !E->IgnoreParenImpCasts()->getType()->isSignedIntegerType());
9796 }
9797 
9798 namespace {
9799 /// The promoted range of values of a type. In general this has the
9800 /// following structure:
9801 ///
9802 ///     |-----------| . . . |-----------|
9803 ///     ^           ^       ^           ^
9804 ///    Min       HoleMin  HoleMax      Max
9805 ///
9806 /// ... where there is only a hole if a signed type is promoted to unsigned
9807 /// (in which case Min and Max are the smallest and largest representable
9808 /// values).
9809 struct PromotedRange {
9810   // Min, or HoleMax if there is a hole.
9811   llvm::APSInt PromotedMin;
9812   // Max, or HoleMin if there is a hole.
9813   llvm::APSInt PromotedMax;
9814 
9815   PromotedRange(IntRange R, unsigned BitWidth, bool Unsigned) {
9816     if (R.Width == 0)
9817       PromotedMin = PromotedMax = llvm::APSInt(BitWidth, Unsigned);
9818     else if (R.Width >= BitWidth && !Unsigned) {
9819       // Promotion made the type *narrower*. This happens when promoting
9820       // a < 32-bit unsigned / <= 32-bit signed bit-field to 'signed int'.
9821       // Treat all values of 'signed int' as being in range for now.
9822       PromotedMin = llvm::APSInt::getMinValue(BitWidth, Unsigned);
9823       PromotedMax = llvm::APSInt::getMaxValue(BitWidth, Unsigned);
9824     } else {
9825       PromotedMin = llvm::APSInt::getMinValue(R.Width, R.NonNegative)
9826                         .extOrTrunc(BitWidth);
9827       PromotedMin.setIsUnsigned(Unsigned);
9828 
9829       PromotedMax = llvm::APSInt::getMaxValue(R.Width, R.NonNegative)
9830                         .extOrTrunc(BitWidth);
9831       PromotedMax.setIsUnsigned(Unsigned);
9832     }
9833   }
9834 
9835   // Determine whether this range is contiguous (has no hole).
9836   bool isContiguous() const { return PromotedMin <= PromotedMax; }
9837 
9838   // Where a constant value is within the range.
9839   enum ComparisonResult {
9840     LT = 0x1,
9841     LE = 0x2,
9842     GT = 0x4,
9843     GE = 0x8,
9844     EQ = 0x10,
9845     NE = 0x20,
9846     InRangeFlag = 0x40,
9847 
9848     Less = LE | LT | NE,
9849     Min = LE | InRangeFlag,
9850     InRange = InRangeFlag,
9851     Max = GE | InRangeFlag,
9852     Greater = GE | GT | NE,
9853 
9854     OnlyValue = LE | GE | EQ | InRangeFlag,
9855     InHole = NE
9856   };
9857 
9858   ComparisonResult compare(const llvm::APSInt &Value) const {
9859     assert(Value.getBitWidth() == PromotedMin.getBitWidth() &&
9860            Value.isUnsigned() == PromotedMin.isUnsigned());
9861     if (!isContiguous()) {
9862       assert(Value.isUnsigned() && "discontiguous range for signed compare");
9863       if (Value.isMinValue()) return Min;
9864       if (Value.isMaxValue()) return Max;
9865       if (Value >= PromotedMin) return InRange;
9866       if (Value <= PromotedMax) return InRange;
9867       return InHole;
9868     }
9869 
9870     switch (llvm::APSInt::compareValues(Value, PromotedMin)) {
9871     case -1: return Less;
9872     case 0: return PromotedMin == PromotedMax ? OnlyValue : Min;
9873     case 1:
9874       switch (llvm::APSInt::compareValues(Value, PromotedMax)) {
9875       case -1: return InRange;
9876       case 0: return Max;
9877       case 1: return Greater;
9878       }
9879     }
9880 
9881     llvm_unreachable("impossible compare result");
9882   }
9883 
9884   static llvm::Optional<StringRef>
9885   constantValue(BinaryOperatorKind Op, ComparisonResult R, bool ConstantOnRHS) {
9886     if (Op == BO_Cmp) {
9887       ComparisonResult LTFlag = LT, GTFlag = GT;
9888       if (ConstantOnRHS) std::swap(LTFlag, GTFlag);
9889 
9890       if (R & EQ) return StringRef("'std::strong_ordering::equal'");
9891       if (R & LTFlag) return StringRef("'std::strong_ordering::less'");
9892       if (R & GTFlag) return StringRef("'std::strong_ordering::greater'");
9893       return llvm::None;
9894     }
9895 
9896     ComparisonResult TrueFlag, FalseFlag;
9897     if (Op == BO_EQ) {
9898       TrueFlag = EQ;
9899       FalseFlag = NE;
9900     } else if (Op == BO_NE) {
9901       TrueFlag = NE;
9902       FalseFlag = EQ;
9903     } else {
9904       if ((Op == BO_LT || Op == BO_GE) ^ ConstantOnRHS) {
9905         TrueFlag = LT;
9906         FalseFlag = GE;
9907       } else {
9908         TrueFlag = GT;
9909         FalseFlag = LE;
9910       }
9911       if (Op == BO_GE || Op == BO_LE)
9912         std::swap(TrueFlag, FalseFlag);
9913     }
9914     if (R & TrueFlag)
9915       return StringRef("true");
9916     if (R & FalseFlag)
9917       return StringRef("false");
9918     return llvm::None;
9919   }
9920 };
9921 }
9922 
9923 static bool HasEnumType(Expr *E) {
9924   // Strip off implicit integral promotions.
9925   while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
9926     if (ICE->getCastKind() != CK_IntegralCast &&
9927         ICE->getCastKind() != CK_NoOp)
9928       break;
9929     E = ICE->getSubExpr();
9930   }
9931 
9932   return E->getType()->isEnumeralType();
9933 }
9934 
9935 static int classifyConstantValue(Expr *Constant) {
9936   // The values of this enumeration are used in the diagnostics
9937   // diag::warn_out_of_range_compare and diag::warn_tautological_bool_compare.
9938   enum ConstantValueKind {
9939     Miscellaneous = 0,
9940     LiteralTrue,
9941     LiteralFalse
9942   };
9943   if (auto *BL = dyn_cast<CXXBoolLiteralExpr>(Constant))
9944     return BL->getValue() ? ConstantValueKind::LiteralTrue
9945                           : ConstantValueKind::LiteralFalse;
9946   return ConstantValueKind::Miscellaneous;
9947 }
9948 
9949 static bool CheckTautologicalComparison(Sema &S, BinaryOperator *E,
9950                                         Expr *Constant, Expr *Other,
9951                                         const llvm::APSInt &Value,
9952                                         bool RhsConstant) {
9953   if (S.inTemplateInstantiation())
9954     return false;
9955 
9956   Expr *OriginalOther = Other;
9957 
9958   Constant = Constant->IgnoreParenImpCasts();
9959   Other = Other->IgnoreParenImpCasts();
9960 
9961   // Suppress warnings on tautological comparisons between values of the same
9962   // enumeration type. There are only two ways we could warn on this:
9963   //  - If the constant is outside the range of representable values of
9964   //    the enumeration. In such a case, we should warn about the cast
9965   //    to enumeration type, not about the comparison.
9966   //  - If the constant is the maximum / minimum in-range value. For an
9967   //    enumeratin type, such comparisons can be meaningful and useful.
9968   if (Constant->getType()->isEnumeralType() &&
9969       S.Context.hasSameUnqualifiedType(Constant->getType(), Other->getType()))
9970     return false;
9971 
9972   // TODO: Investigate using GetExprRange() to get tighter bounds
9973   // on the bit ranges.
9974   QualType OtherT = Other->getType();
9975   if (const auto *AT = OtherT->getAs<AtomicType>())
9976     OtherT = AT->getValueType();
9977   IntRange OtherRange = IntRange::forValueOfType(S.Context, OtherT);
9978 
9979   // Whether we're treating Other as being a bool because of the form of
9980   // expression despite it having another type (typically 'int' in C).
9981   bool OtherIsBooleanDespiteType =
9982       !OtherT->isBooleanType() && Other->isKnownToHaveBooleanValue();
9983   if (OtherIsBooleanDespiteType)
9984     OtherRange = IntRange::forBoolType();
9985 
9986   // Determine the promoted range of the other type and see if a comparison of
9987   // the constant against that range is tautological.
9988   PromotedRange OtherPromotedRange(OtherRange, Value.getBitWidth(),
9989                                    Value.isUnsigned());
9990   auto Cmp = OtherPromotedRange.compare(Value);
9991   auto Result = PromotedRange::constantValue(E->getOpcode(), Cmp, RhsConstant);
9992   if (!Result)
9993     return false;
9994 
9995   // Suppress the diagnostic for an in-range comparison if the constant comes
9996   // from a macro or enumerator. We don't want to diagnose
9997   //
9998   //   some_long_value <= INT_MAX
9999   //
10000   // when sizeof(int) == sizeof(long).
10001   bool InRange = Cmp & PromotedRange::InRangeFlag;
10002   if (InRange && IsEnumConstOrFromMacro(S, Constant))
10003     return false;
10004 
10005   // If this is a comparison to an enum constant, include that
10006   // constant in the diagnostic.
10007   const EnumConstantDecl *ED = nullptr;
10008   if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Constant))
10009     ED = dyn_cast<EnumConstantDecl>(DR->getDecl());
10010 
10011   // Should be enough for uint128 (39 decimal digits)
10012   SmallString<64> PrettySourceValue;
10013   llvm::raw_svector_ostream OS(PrettySourceValue);
10014   if (ED)
10015     OS << '\'' << *ED << "' (" << Value << ")";
10016   else
10017     OS << Value;
10018 
10019   // FIXME: We use a somewhat different formatting for the in-range cases and
10020   // cases involving boolean values for historical reasons. We should pick a
10021   // consistent way of presenting these diagnostics.
10022   if (!InRange || Other->isKnownToHaveBooleanValue()) {
10023     S.DiagRuntimeBehavior(
10024       E->getOperatorLoc(), E,
10025       S.PDiag(!InRange ? diag::warn_out_of_range_compare
10026                        : diag::warn_tautological_bool_compare)
10027           << OS.str() << classifyConstantValue(Constant)
10028           << OtherT << OtherIsBooleanDespiteType << *Result
10029           << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange());
10030   } else {
10031     unsigned Diag = (isKnownToHaveUnsignedValue(OriginalOther) && Value == 0)
10032                         ? (HasEnumType(OriginalOther)
10033                                ? diag::warn_unsigned_enum_always_true_comparison
10034                                : diag::warn_unsigned_always_true_comparison)
10035                         : diag::warn_tautological_constant_compare;
10036 
10037     S.Diag(E->getOperatorLoc(), Diag)
10038         << RhsConstant << OtherT << E->getOpcodeStr() << OS.str() << *Result
10039         << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
10040   }
10041 
10042   return true;
10043 }
10044 
10045 /// Analyze the operands of the given comparison.  Implements the
10046 /// fallback case from AnalyzeComparison.
10047 static void AnalyzeImpConvsInComparison(Sema &S, BinaryOperator *E) {
10048   AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
10049   AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
10050 }
10051 
10052 /// Implements -Wsign-compare.
10053 ///
10054 /// \param E the binary operator to check for warnings
10055 static void AnalyzeComparison(Sema &S, BinaryOperator *E) {
10056   // The type the comparison is being performed in.
10057   QualType T = E->getLHS()->getType();
10058 
10059   // Only analyze comparison operators where both sides have been converted to
10060   // the same type.
10061   if (!S.Context.hasSameUnqualifiedType(T, E->getRHS()->getType()))
10062     return AnalyzeImpConvsInComparison(S, E);
10063 
10064   // Don't analyze value-dependent comparisons directly.
10065   if (E->isValueDependent())
10066     return AnalyzeImpConvsInComparison(S, E);
10067 
10068   Expr *LHS = E->getLHS();
10069   Expr *RHS = E->getRHS();
10070 
10071   if (T->isIntegralType(S.Context)) {
10072     llvm::APSInt RHSValue;
10073     llvm::APSInt LHSValue;
10074 
10075     bool IsRHSIntegralLiteral = RHS->isIntegerConstantExpr(RHSValue, S.Context);
10076     bool IsLHSIntegralLiteral = LHS->isIntegerConstantExpr(LHSValue, S.Context);
10077 
10078     // We don't care about expressions whose result is a constant.
10079     if (IsRHSIntegralLiteral && IsLHSIntegralLiteral)
10080       return AnalyzeImpConvsInComparison(S, E);
10081 
10082     // We only care about expressions where just one side is literal
10083     if (IsRHSIntegralLiteral ^ IsLHSIntegralLiteral) {
10084       // Is the constant on the RHS or LHS?
10085       const bool RhsConstant = IsRHSIntegralLiteral;
10086       Expr *Const = RhsConstant ? RHS : LHS;
10087       Expr *Other = RhsConstant ? LHS : RHS;
10088       const llvm::APSInt &Value = RhsConstant ? RHSValue : LHSValue;
10089 
10090       // Check whether an integer constant comparison results in a value
10091       // of 'true' or 'false'.
10092       if (CheckTautologicalComparison(S, E, Const, Other, Value, RhsConstant))
10093         return AnalyzeImpConvsInComparison(S, E);
10094     }
10095   }
10096 
10097   if (!T->hasUnsignedIntegerRepresentation()) {
10098     // We don't do anything special if this isn't an unsigned integral
10099     // comparison:  we're only interested in integral comparisons, and
10100     // signed comparisons only happen in cases we don't care to warn about.
10101     return AnalyzeImpConvsInComparison(S, E);
10102   }
10103 
10104   LHS = LHS->IgnoreParenImpCasts();
10105   RHS = RHS->IgnoreParenImpCasts();
10106 
10107   if (!S.getLangOpts().CPlusPlus) {
10108     // Avoid warning about comparison of integers with different signs when
10109     // RHS/LHS has a `typeof(E)` type whose sign is different from the sign of
10110     // the type of `E`.
10111     if (const auto *TET = dyn_cast<TypeOfExprType>(LHS->getType()))
10112       LHS = TET->getUnderlyingExpr()->IgnoreParenImpCasts();
10113     if (const auto *TET = dyn_cast<TypeOfExprType>(RHS->getType()))
10114       RHS = TET->getUnderlyingExpr()->IgnoreParenImpCasts();
10115   }
10116 
10117   // Check to see if one of the (unmodified) operands is of different
10118   // signedness.
10119   Expr *signedOperand, *unsignedOperand;
10120   if (LHS->getType()->hasSignedIntegerRepresentation()) {
10121     assert(!RHS->getType()->hasSignedIntegerRepresentation() &&
10122            "unsigned comparison between two signed integer expressions?");
10123     signedOperand = LHS;
10124     unsignedOperand = RHS;
10125   } else if (RHS->getType()->hasSignedIntegerRepresentation()) {
10126     signedOperand = RHS;
10127     unsignedOperand = LHS;
10128   } else {
10129     return AnalyzeImpConvsInComparison(S, E);
10130   }
10131 
10132   // Otherwise, calculate the effective range of the signed operand.
10133   IntRange signedRange = GetExprRange(S.Context, signedOperand);
10134 
10135   // Go ahead and analyze implicit conversions in the operands.  Note
10136   // that we skip the implicit conversions on both sides.
10137   AnalyzeImplicitConversions(S, LHS, E->getOperatorLoc());
10138   AnalyzeImplicitConversions(S, RHS, E->getOperatorLoc());
10139 
10140   // If the signed range is non-negative, -Wsign-compare won't fire.
10141   if (signedRange.NonNegative)
10142     return;
10143 
10144   // For (in)equality comparisons, if the unsigned operand is a
10145   // constant which cannot collide with a overflowed signed operand,
10146   // then reinterpreting the signed operand as unsigned will not
10147   // change the result of the comparison.
10148   if (E->isEqualityOp()) {
10149     unsigned comparisonWidth = S.Context.getIntWidth(T);
10150     IntRange unsignedRange = GetExprRange(S.Context, unsignedOperand);
10151 
10152     // We should never be unable to prove that the unsigned operand is
10153     // non-negative.
10154     assert(unsignedRange.NonNegative && "unsigned range includes negative?");
10155 
10156     if (unsignedRange.Width < comparisonWidth)
10157       return;
10158   }
10159 
10160   S.DiagRuntimeBehavior(E->getOperatorLoc(), E,
10161     S.PDiag(diag::warn_mixed_sign_comparison)
10162       << LHS->getType() << RHS->getType()
10163       << LHS->getSourceRange() << RHS->getSourceRange());
10164 }
10165 
10166 /// Analyzes an attempt to assign the given value to a bitfield.
10167 ///
10168 /// Returns true if there was something fishy about the attempt.
10169 static bool AnalyzeBitFieldAssignment(Sema &S, FieldDecl *Bitfield, Expr *Init,
10170                                       SourceLocation InitLoc) {
10171   assert(Bitfield->isBitField());
10172   if (Bitfield->isInvalidDecl())
10173     return false;
10174 
10175   // White-list bool bitfields.
10176   QualType BitfieldType = Bitfield->getType();
10177   if (BitfieldType->isBooleanType())
10178      return false;
10179 
10180   if (BitfieldType->isEnumeralType()) {
10181     EnumDecl *BitfieldEnumDecl = BitfieldType->getAs<EnumType>()->getDecl();
10182     // If the underlying enum type was not explicitly specified as an unsigned
10183     // type and the enum contain only positive values, MSVC++ will cause an
10184     // inconsistency by storing this as a signed type.
10185     if (S.getLangOpts().CPlusPlus11 &&
10186         !BitfieldEnumDecl->getIntegerTypeSourceInfo() &&
10187         BitfieldEnumDecl->getNumPositiveBits() > 0 &&
10188         BitfieldEnumDecl->getNumNegativeBits() == 0) {
10189       S.Diag(InitLoc, diag::warn_no_underlying_type_specified_for_enum_bitfield)
10190         << BitfieldEnumDecl->getNameAsString();
10191     }
10192   }
10193 
10194   if (Bitfield->getType()->isBooleanType())
10195     return false;
10196 
10197   // Ignore value- or type-dependent expressions.
10198   if (Bitfield->getBitWidth()->isValueDependent() ||
10199       Bitfield->getBitWidth()->isTypeDependent() ||
10200       Init->isValueDependent() ||
10201       Init->isTypeDependent())
10202     return false;
10203 
10204   Expr *OriginalInit = Init->IgnoreParenImpCasts();
10205   unsigned FieldWidth = Bitfield->getBitWidthValue(S.Context);
10206 
10207   llvm::APSInt Value;
10208   if (!OriginalInit->EvaluateAsInt(Value, S.Context,
10209                                    Expr::SE_AllowSideEffects)) {
10210     // The RHS is not constant.  If the RHS has an enum type, make sure the
10211     // bitfield is wide enough to hold all the values of the enum without
10212     // truncation.
10213     if (const auto *EnumTy = OriginalInit->getType()->getAs<EnumType>()) {
10214       EnumDecl *ED = EnumTy->getDecl();
10215       bool SignedBitfield = BitfieldType->isSignedIntegerType();
10216 
10217       // Enum types are implicitly signed on Windows, so check if there are any
10218       // negative enumerators to see if the enum was intended to be signed or
10219       // not.
10220       bool SignedEnum = ED->getNumNegativeBits() > 0;
10221 
10222       // Check for surprising sign changes when assigning enum values to a
10223       // bitfield of different signedness.  If the bitfield is signed and we
10224       // have exactly the right number of bits to store this unsigned enum,
10225       // suggest changing the enum to an unsigned type. This typically happens
10226       // on Windows where unfixed enums always use an underlying type of 'int'.
10227       unsigned DiagID = 0;
10228       if (SignedEnum && !SignedBitfield) {
10229         DiagID = diag::warn_unsigned_bitfield_assigned_signed_enum;
10230       } else if (SignedBitfield && !SignedEnum &&
10231                  ED->getNumPositiveBits() == FieldWidth) {
10232         DiagID = diag::warn_signed_bitfield_enum_conversion;
10233       }
10234 
10235       if (DiagID) {
10236         S.Diag(InitLoc, DiagID) << Bitfield << ED;
10237         TypeSourceInfo *TSI = Bitfield->getTypeSourceInfo();
10238         SourceRange TypeRange =
10239             TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange();
10240         S.Diag(Bitfield->getTypeSpecStartLoc(), diag::note_change_bitfield_sign)
10241             << SignedEnum << TypeRange;
10242       }
10243 
10244       // Compute the required bitwidth. If the enum has negative values, we need
10245       // one more bit than the normal number of positive bits to represent the
10246       // sign bit.
10247       unsigned BitsNeeded = SignedEnum ? std::max(ED->getNumPositiveBits() + 1,
10248                                                   ED->getNumNegativeBits())
10249                                        : ED->getNumPositiveBits();
10250 
10251       // Check the bitwidth.
10252       if (BitsNeeded > FieldWidth) {
10253         Expr *WidthExpr = Bitfield->getBitWidth();
10254         S.Diag(InitLoc, diag::warn_bitfield_too_small_for_enum)
10255             << Bitfield << ED;
10256         S.Diag(WidthExpr->getExprLoc(), diag::note_widen_bitfield)
10257             << BitsNeeded << ED << WidthExpr->getSourceRange();
10258       }
10259     }
10260 
10261     return false;
10262   }
10263 
10264   unsigned OriginalWidth = Value.getBitWidth();
10265 
10266   if (!Value.isSigned() || Value.isNegative())
10267     if (UnaryOperator *UO = dyn_cast<UnaryOperator>(OriginalInit))
10268       if (UO->getOpcode() == UO_Minus || UO->getOpcode() == UO_Not)
10269         OriginalWidth = Value.getMinSignedBits();
10270 
10271   if (OriginalWidth <= FieldWidth)
10272     return false;
10273 
10274   // Compute the value which the bitfield will contain.
10275   llvm::APSInt TruncatedValue = Value.trunc(FieldWidth);
10276   TruncatedValue.setIsSigned(BitfieldType->isSignedIntegerType());
10277 
10278   // Check whether the stored value is equal to the original value.
10279   TruncatedValue = TruncatedValue.extend(OriginalWidth);
10280   if (llvm::APSInt::isSameValue(Value, TruncatedValue))
10281     return false;
10282 
10283   // Special-case bitfields of width 1: booleans are naturally 0/1, and
10284   // therefore don't strictly fit into a signed bitfield of width 1.
10285   if (FieldWidth == 1 && Value == 1)
10286     return false;
10287 
10288   std::string PrettyValue = Value.toString(10);
10289   std::string PrettyTrunc = TruncatedValue.toString(10);
10290 
10291   S.Diag(InitLoc, diag::warn_impcast_bitfield_precision_constant)
10292     << PrettyValue << PrettyTrunc << OriginalInit->getType()
10293     << Init->getSourceRange();
10294 
10295   return true;
10296 }
10297 
10298 /// Analyze the given simple or compound assignment for warning-worthy
10299 /// operations.
10300 static void AnalyzeAssignment(Sema &S, BinaryOperator *E) {
10301   // Just recurse on the LHS.
10302   AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
10303 
10304   // We want to recurse on the RHS as normal unless we're assigning to
10305   // a bitfield.
10306   if (FieldDecl *Bitfield = E->getLHS()->getSourceBitField()) {
10307     if (AnalyzeBitFieldAssignment(S, Bitfield, E->getRHS(),
10308                                   E->getOperatorLoc())) {
10309       // Recurse, ignoring any implicit conversions on the RHS.
10310       return AnalyzeImplicitConversions(S, E->getRHS()->IgnoreParenImpCasts(),
10311                                         E->getOperatorLoc());
10312     }
10313   }
10314 
10315   AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
10316 
10317   // Diagnose implicitly sequentially-consistent atomic assignment.
10318   if (E->getLHS()->getType()->isAtomicType())
10319     S.Diag(E->getRHS()->getBeginLoc(), diag::warn_atomic_implicit_seq_cst);
10320 }
10321 
10322 /// Diagnose an implicit cast;  purely a helper for CheckImplicitConversion.
10323 static void DiagnoseImpCast(Sema &S, Expr *E, QualType SourceType, QualType T,
10324                             SourceLocation CContext, unsigned diag,
10325                             bool pruneControlFlow = false) {
10326   if (pruneControlFlow) {
10327     S.DiagRuntimeBehavior(E->getExprLoc(), E,
10328                           S.PDiag(diag)
10329                             << SourceType << T << E->getSourceRange()
10330                             << SourceRange(CContext));
10331     return;
10332   }
10333   S.Diag(E->getExprLoc(), diag)
10334     << SourceType << T << E->getSourceRange() << SourceRange(CContext);
10335 }
10336 
10337 /// Diagnose an implicit cast;  purely a helper for CheckImplicitConversion.
10338 static void DiagnoseImpCast(Sema &S, Expr *E, QualType T,
10339                             SourceLocation CContext,
10340                             unsigned diag, bool pruneControlFlow = false) {
10341   DiagnoseImpCast(S, E, E->getType(), T, CContext, diag, pruneControlFlow);
10342 }
10343 
10344 /// Diagnose an implicit cast from a floating point value to an integer value.
10345 static void DiagnoseFloatingImpCast(Sema &S, Expr *E, QualType T,
10346                                     SourceLocation CContext) {
10347   const bool IsBool = T->isSpecificBuiltinType(BuiltinType::Bool);
10348   const bool PruneWarnings = S.inTemplateInstantiation();
10349 
10350   Expr *InnerE = E->IgnoreParenImpCasts();
10351   // We also want to warn on, e.g., "int i = -1.234"
10352   if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(InnerE))
10353     if (UOp->getOpcode() == UO_Minus || UOp->getOpcode() == UO_Plus)
10354       InnerE = UOp->getSubExpr()->IgnoreParenImpCasts();
10355 
10356   const bool IsLiteral =
10357       isa<FloatingLiteral>(E) || isa<FloatingLiteral>(InnerE);
10358 
10359   llvm::APFloat Value(0.0);
10360   bool IsConstant =
10361     E->EvaluateAsFloat(Value, S.Context, Expr::SE_AllowSideEffects);
10362   if (!IsConstant) {
10363     return DiagnoseImpCast(S, E, T, CContext,
10364                            diag::warn_impcast_float_integer, PruneWarnings);
10365   }
10366 
10367   bool isExact = false;
10368 
10369   llvm::APSInt IntegerValue(S.Context.getIntWidth(T),
10370                             T->hasUnsignedIntegerRepresentation());
10371   llvm::APFloat::opStatus Result = Value.convertToInteger(
10372       IntegerValue, llvm::APFloat::rmTowardZero, &isExact);
10373 
10374   if (Result == llvm::APFloat::opOK && isExact) {
10375     if (IsLiteral) return;
10376     return DiagnoseImpCast(S, E, T, CContext, diag::warn_impcast_float_integer,
10377                            PruneWarnings);
10378   }
10379 
10380   // Conversion of a floating-point value to a non-bool integer where the
10381   // integral part cannot be represented by the integer type is undefined.
10382   if (!IsBool && Result == llvm::APFloat::opInvalidOp)
10383     return DiagnoseImpCast(
10384         S, E, T, CContext,
10385         IsLiteral ? diag::warn_impcast_literal_float_to_integer_out_of_range
10386                   : diag::warn_impcast_float_to_integer_out_of_range,
10387         PruneWarnings);
10388 
10389   unsigned DiagID = 0;
10390   if (IsLiteral) {
10391     // Warn on floating point literal to integer.
10392     DiagID = diag::warn_impcast_literal_float_to_integer;
10393   } else if (IntegerValue == 0) {
10394     if (Value.isZero()) {  // Skip -0.0 to 0 conversion.
10395       return DiagnoseImpCast(S, E, T, CContext,
10396                              diag::warn_impcast_float_integer, PruneWarnings);
10397     }
10398     // Warn on non-zero to zero conversion.
10399     DiagID = diag::warn_impcast_float_to_integer_zero;
10400   } else {
10401     if (IntegerValue.isUnsigned()) {
10402       if (!IntegerValue.isMaxValue()) {
10403         return DiagnoseImpCast(S, E, T, CContext,
10404                                diag::warn_impcast_float_integer, PruneWarnings);
10405       }
10406     } else {  // IntegerValue.isSigned()
10407       if (!IntegerValue.isMaxSignedValue() &&
10408           !IntegerValue.isMinSignedValue()) {
10409         return DiagnoseImpCast(S, E, T, CContext,
10410                                diag::warn_impcast_float_integer, PruneWarnings);
10411       }
10412     }
10413     // Warn on evaluatable floating point expression to integer conversion.
10414     DiagID = diag::warn_impcast_float_to_integer;
10415   }
10416 
10417   // FIXME: Force the precision of the source value down so we don't print
10418   // digits which are usually useless (we don't really care here if we
10419   // truncate a digit by accident in edge cases).  Ideally, APFloat::toString
10420   // would automatically print the shortest representation, but it's a bit
10421   // tricky to implement.
10422   SmallString<16> PrettySourceValue;
10423   unsigned precision = llvm::APFloat::semanticsPrecision(Value.getSemantics());
10424   precision = (precision * 59 + 195) / 196;
10425   Value.toString(PrettySourceValue, precision);
10426 
10427   SmallString<16> PrettyTargetValue;
10428   if (IsBool)
10429     PrettyTargetValue = Value.isZero() ? "false" : "true";
10430   else
10431     IntegerValue.toString(PrettyTargetValue);
10432 
10433   if (PruneWarnings) {
10434     S.DiagRuntimeBehavior(E->getExprLoc(), E,
10435                           S.PDiag(DiagID)
10436                               << E->getType() << T.getUnqualifiedType()
10437                               << PrettySourceValue << PrettyTargetValue
10438                               << E->getSourceRange() << SourceRange(CContext));
10439   } else {
10440     S.Diag(E->getExprLoc(), DiagID)
10441         << E->getType() << T.getUnqualifiedType() << PrettySourceValue
10442         << PrettyTargetValue << E->getSourceRange() << SourceRange(CContext);
10443   }
10444 }
10445 
10446 /// Analyze the given compound assignment for the possible losing of
10447 /// floating-point precision.
10448 static void AnalyzeCompoundAssignment(Sema &S, BinaryOperator *E) {
10449   assert(isa<CompoundAssignOperator>(E) &&
10450          "Must be compound assignment operation");
10451   // Recurse on the LHS and RHS in here
10452   AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
10453   AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
10454 
10455   if (E->getLHS()->getType()->isAtomicType())
10456     S.Diag(E->getOperatorLoc(), diag::warn_atomic_implicit_seq_cst);
10457 
10458   // Now check the outermost expression
10459   const auto *ResultBT = E->getLHS()->getType()->getAs<BuiltinType>();
10460   const auto *RBT = cast<CompoundAssignOperator>(E)
10461                         ->getComputationResultType()
10462                         ->getAs<BuiltinType>();
10463 
10464   // The below checks assume source is floating point.
10465   if (!ResultBT || !RBT || !RBT->isFloatingPoint()) return;
10466 
10467   // If source is floating point but target is not.
10468   if (!ResultBT->isFloatingPoint())
10469     return DiagnoseFloatingImpCast(S, E, E->getRHS()->getType(),
10470                                    E->getExprLoc());
10471 
10472   // If both source and target are floating points.
10473   // Builtin FP kinds are ordered by increasing FP rank.
10474   if (ResultBT->getKind() < RBT->getKind() &&
10475       // We don't want to warn for system macro.
10476       !S.SourceMgr.isInSystemMacro(E->getOperatorLoc()))
10477     // warn about dropping FP rank.
10478     DiagnoseImpCast(S, E->getRHS(), E->getLHS()->getType(), E->getOperatorLoc(),
10479                     diag::warn_impcast_float_result_precision);
10480 }
10481 
10482 static std::string PrettyPrintInRange(const llvm::APSInt &Value,
10483                                       IntRange Range) {
10484   if (!Range.Width) return "0";
10485 
10486   llvm::APSInt ValueInRange = Value;
10487   ValueInRange.setIsSigned(!Range.NonNegative);
10488   ValueInRange = ValueInRange.trunc(Range.Width);
10489   return ValueInRange.toString(10);
10490 }
10491 
10492 static bool IsImplicitBoolFloatConversion(Sema &S, Expr *Ex, bool ToBool) {
10493   if (!isa<ImplicitCastExpr>(Ex))
10494     return false;
10495 
10496   Expr *InnerE = Ex->IgnoreParenImpCasts();
10497   const Type *Target = S.Context.getCanonicalType(Ex->getType()).getTypePtr();
10498   const Type *Source =
10499     S.Context.getCanonicalType(InnerE->getType()).getTypePtr();
10500   if (Target->isDependentType())
10501     return false;
10502 
10503   const BuiltinType *FloatCandidateBT =
10504     dyn_cast<BuiltinType>(ToBool ? Source : Target);
10505   const Type *BoolCandidateType = ToBool ? Target : Source;
10506 
10507   return (BoolCandidateType->isSpecificBuiltinType(BuiltinType::Bool) &&
10508           FloatCandidateBT && (FloatCandidateBT->isFloatingPoint()));
10509 }
10510 
10511 static void CheckImplicitArgumentConversions(Sema &S, CallExpr *TheCall,
10512                                              SourceLocation CC) {
10513   unsigned NumArgs = TheCall->getNumArgs();
10514   for (unsigned i = 0; i < NumArgs; ++i) {
10515     Expr *CurrA = TheCall->getArg(i);
10516     if (!IsImplicitBoolFloatConversion(S, CurrA, true))
10517       continue;
10518 
10519     bool IsSwapped = ((i > 0) &&
10520         IsImplicitBoolFloatConversion(S, TheCall->getArg(i - 1), false));
10521     IsSwapped |= ((i < (NumArgs - 1)) &&
10522         IsImplicitBoolFloatConversion(S, TheCall->getArg(i + 1), false));
10523     if (IsSwapped) {
10524       // Warn on this floating-point to bool conversion.
10525       DiagnoseImpCast(S, CurrA->IgnoreParenImpCasts(),
10526                       CurrA->getType(), CC,
10527                       diag::warn_impcast_floating_point_to_bool);
10528     }
10529   }
10530 }
10531 
10532 static void DiagnoseNullConversion(Sema &S, Expr *E, QualType T,
10533                                    SourceLocation CC) {
10534   if (S.Diags.isIgnored(diag::warn_impcast_null_pointer_to_integer,
10535                         E->getExprLoc()))
10536     return;
10537 
10538   // Don't warn on functions which have return type nullptr_t.
10539   if (isa<CallExpr>(E))
10540     return;
10541 
10542   // Check for NULL (GNUNull) or nullptr (CXX11_nullptr).
10543   const Expr::NullPointerConstantKind NullKind =
10544       E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull);
10545   if (NullKind != Expr::NPCK_GNUNull && NullKind != Expr::NPCK_CXX11_nullptr)
10546     return;
10547 
10548   // Return if target type is a safe conversion.
10549   if (T->isAnyPointerType() || T->isBlockPointerType() ||
10550       T->isMemberPointerType() || !T->isScalarType() || T->isNullPtrType())
10551     return;
10552 
10553   SourceLocation Loc = E->getSourceRange().getBegin();
10554 
10555   // Venture through the macro stacks to get to the source of macro arguments.
10556   // The new location is a better location than the complete location that was
10557   // passed in.
10558   Loc = S.SourceMgr.getTopMacroCallerLoc(Loc);
10559   CC = S.SourceMgr.getTopMacroCallerLoc(CC);
10560 
10561   // __null is usually wrapped in a macro.  Go up a macro if that is the case.
10562   if (NullKind == Expr::NPCK_GNUNull && Loc.isMacroID()) {
10563     StringRef MacroName = Lexer::getImmediateMacroNameForDiagnostics(
10564         Loc, S.SourceMgr, S.getLangOpts());
10565     if (MacroName == "NULL")
10566       Loc = S.SourceMgr.getImmediateExpansionRange(Loc).getBegin();
10567   }
10568 
10569   // Only warn if the null and context location are in the same macro expansion.
10570   if (S.SourceMgr.getFileID(Loc) != S.SourceMgr.getFileID(CC))
10571     return;
10572 
10573   S.Diag(Loc, diag::warn_impcast_null_pointer_to_integer)
10574       << (NullKind == Expr::NPCK_CXX11_nullptr) << T << SourceRange(CC)
10575       << FixItHint::CreateReplacement(Loc,
10576                                       S.getFixItZeroLiteralForType(T, Loc));
10577 }
10578 
10579 static void checkObjCArrayLiteral(Sema &S, QualType TargetType,
10580                                   ObjCArrayLiteral *ArrayLiteral);
10581 
10582 static void
10583 checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
10584                            ObjCDictionaryLiteral *DictionaryLiteral);
10585 
10586 /// Check a single element within a collection literal against the
10587 /// target element type.
10588 static void checkObjCCollectionLiteralElement(Sema &S,
10589                                               QualType TargetElementType,
10590                                               Expr *Element,
10591                                               unsigned ElementKind) {
10592   // Skip a bitcast to 'id' or qualified 'id'.
10593   if (auto ICE = dyn_cast<ImplicitCastExpr>(Element)) {
10594     if (ICE->getCastKind() == CK_BitCast &&
10595         ICE->getSubExpr()->getType()->getAs<ObjCObjectPointerType>())
10596       Element = ICE->getSubExpr();
10597   }
10598 
10599   QualType ElementType = Element->getType();
10600   ExprResult ElementResult(Element);
10601   if (ElementType->getAs<ObjCObjectPointerType>() &&
10602       S.CheckSingleAssignmentConstraints(TargetElementType,
10603                                          ElementResult,
10604                                          false, false)
10605         != Sema::Compatible) {
10606     S.Diag(Element->getBeginLoc(), diag::warn_objc_collection_literal_element)
10607         << ElementType << ElementKind << TargetElementType
10608         << Element->getSourceRange();
10609   }
10610 
10611   if (auto ArrayLiteral = dyn_cast<ObjCArrayLiteral>(Element))
10612     checkObjCArrayLiteral(S, TargetElementType, ArrayLiteral);
10613   else if (auto DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(Element))
10614     checkObjCDictionaryLiteral(S, TargetElementType, DictionaryLiteral);
10615 }
10616 
10617 /// Check an Objective-C array literal being converted to the given
10618 /// target type.
10619 static void checkObjCArrayLiteral(Sema &S, QualType TargetType,
10620                                   ObjCArrayLiteral *ArrayLiteral) {
10621   if (!S.NSArrayDecl)
10622     return;
10623 
10624   const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
10625   if (!TargetObjCPtr)
10626     return;
10627 
10628   if (TargetObjCPtr->isUnspecialized() ||
10629       TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
10630         != S.NSArrayDecl->getCanonicalDecl())
10631     return;
10632 
10633   auto TypeArgs = TargetObjCPtr->getTypeArgs();
10634   if (TypeArgs.size() != 1)
10635     return;
10636 
10637   QualType TargetElementType = TypeArgs[0];
10638   for (unsigned I = 0, N = ArrayLiteral->getNumElements(); I != N; ++I) {
10639     checkObjCCollectionLiteralElement(S, TargetElementType,
10640                                       ArrayLiteral->getElement(I),
10641                                       0);
10642   }
10643 }
10644 
10645 /// Check an Objective-C dictionary literal being converted to the given
10646 /// target type.
10647 static void
10648 checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
10649                            ObjCDictionaryLiteral *DictionaryLiteral) {
10650   if (!S.NSDictionaryDecl)
10651     return;
10652 
10653   const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
10654   if (!TargetObjCPtr)
10655     return;
10656 
10657   if (TargetObjCPtr->isUnspecialized() ||
10658       TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
10659         != S.NSDictionaryDecl->getCanonicalDecl())
10660     return;
10661 
10662   auto TypeArgs = TargetObjCPtr->getTypeArgs();
10663   if (TypeArgs.size() != 2)
10664     return;
10665 
10666   QualType TargetKeyType = TypeArgs[0];
10667   QualType TargetObjectType = TypeArgs[1];
10668   for (unsigned I = 0, N = DictionaryLiteral->getNumElements(); I != N; ++I) {
10669     auto Element = DictionaryLiteral->getKeyValueElement(I);
10670     checkObjCCollectionLiteralElement(S, TargetKeyType, Element.Key, 1);
10671     checkObjCCollectionLiteralElement(S, TargetObjectType, Element.Value, 2);
10672   }
10673 }
10674 
10675 // Helper function to filter out cases for constant width constant conversion.
10676 // Don't warn on char array initialization or for non-decimal values.
10677 static bool isSameWidthConstantConversion(Sema &S, Expr *E, QualType T,
10678                                           SourceLocation CC) {
10679   // If initializing from a constant, and the constant starts with '0',
10680   // then it is a binary, octal, or hexadecimal.  Allow these constants
10681   // to fill all the bits, even if there is a sign change.
10682   if (auto *IntLit = dyn_cast<IntegerLiteral>(E->IgnoreParenImpCasts())) {
10683     const char FirstLiteralCharacter =
10684         S.getSourceManager().getCharacterData(IntLit->getBeginLoc())[0];
10685     if (FirstLiteralCharacter == '0')
10686       return false;
10687   }
10688 
10689   // If the CC location points to a '{', and the type is char, then assume
10690   // assume it is an array initialization.
10691   if (CC.isValid() && T->isCharType()) {
10692     const char FirstContextCharacter =
10693         S.getSourceManager().getCharacterData(CC)[0];
10694     if (FirstContextCharacter == '{')
10695       return false;
10696   }
10697 
10698   return true;
10699 }
10700 
10701 static void
10702 CheckImplicitConversion(Sema &S, Expr *E, QualType T, SourceLocation CC,
10703                         bool *ICContext = nullptr) {
10704   if (E->isTypeDependent() || E->isValueDependent()) return;
10705 
10706   const Type *Source = S.Context.getCanonicalType(E->getType()).getTypePtr();
10707   const Type *Target = S.Context.getCanonicalType(T).getTypePtr();
10708   if (Source == Target) return;
10709   if (Target->isDependentType()) return;
10710 
10711   // If the conversion context location is invalid don't complain. We also
10712   // don't want to emit a warning if the issue occurs from the expansion of
10713   // a system macro. The problem is that 'getSpellingLoc()' is slow, so we
10714   // delay this check as long as possible. Once we detect we are in that
10715   // scenario, we just return.
10716   if (CC.isInvalid())
10717     return;
10718 
10719   if (Source->isAtomicType())
10720     S.Diag(E->getExprLoc(), diag::warn_atomic_implicit_seq_cst);
10721 
10722   // Diagnose implicit casts to bool.
10723   if (Target->isSpecificBuiltinType(BuiltinType::Bool)) {
10724     if (isa<StringLiteral>(E))
10725       // Warn on string literal to bool.  Checks for string literals in logical
10726       // and expressions, for instance, assert(0 && "error here"), are
10727       // prevented by a check in AnalyzeImplicitConversions().
10728       return DiagnoseImpCast(S, E, T, CC,
10729                              diag::warn_impcast_string_literal_to_bool);
10730     if (isa<ObjCStringLiteral>(E) || isa<ObjCArrayLiteral>(E) ||
10731         isa<ObjCDictionaryLiteral>(E) || isa<ObjCBoxedExpr>(E)) {
10732       // This covers the literal expressions that evaluate to Objective-C
10733       // objects.
10734       return DiagnoseImpCast(S, E, T, CC,
10735                              diag::warn_impcast_objective_c_literal_to_bool);
10736     }
10737     if (Source->isPointerType() || Source->canDecayToPointerType()) {
10738       // Warn on pointer to bool conversion that is always true.
10739       S.DiagnoseAlwaysNonNullPointer(E, Expr::NPCK_NotNull, /*IsEqual*/ false,
10740                                      SourceRange(CC));
10741     }
10742   }
10743 
10744   // Check implicit casts from Objective-C collection literals to specialized
10745   // collection types, e.g., NSArray<NSString *> *.
10746   if (auto *ArrayLiteral = dyn_cast<ObjCArrayLiteral>(E))
10747     checkObjCArrayLiteral(S, QualType(Target, 0), ArrayLiteral);
10748   else if (auto *DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(E))
10749     checkObjCDictionaryLiteral(S, QualType(Target, 0), DictionaryLiteral);
10750 
10751   // Strip vector types.
10752   if (isa<VectorType>(Source)) {
10753     if (!isa<VectorType>(Target)) {
10754       if (S.SourceMgr.isInSystemMacro(CC))
10755         return;
10756       return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_vector_scalar);
10757     }
10758 
10759     // If the vector cast is cast between two vectors of the same size, it is
10760     // a bitcast, not a conversion.
10761     if (S.Context.getTypeSize(Source) == S.Context.getTypeSize(Target))
10762       return;
10763 
10764     Source = cast<VectorType>(Source)->getElementType().getTypePtr();
10765     Target = cast<VectorType>(Target)->getElementType().getTypePtr();
10766   }
10767   if (auto VecTy = dyn_cast<VectorType>(Target))
10768     Target = VecTy->getElementType().getTypePtr();
10769 
10770   // Strip complex types.
10771   if (isa<ComplexType>(Source)) {
10772     if (!isa<ComplexType>(Target)) {
10773       if (S.SourceMgr.isInSystemMacro(CC) || Target->isBooleanType())
10774         return;
10775 
10776       return DiagnoseImpCast(S, E, T, CC,
10777                              S.getLangOpts().CPlusPlus
10778                                  ? diag::err_impcast_complex_scalar
10779                                  : diag::warn_impcast_complex_scalar);
10780     }
10781 
10782     Source = cast<ComplexType>(Source)->getElementType().getTypePtr();
10783     Target = cast<ComplexType>(Target)->getElementType().getTypePtr();
10784   }
10785 
10786   const BuiltinType *SourceBT = dyn_cast<BuiltinType>(Source);
10787   const BuiltinType *TargetBT = dyn_cast<BuiltinType>(Target);
10788 
10789   // If the source is floating point...
10790   if (SourceBT && SourceBT->isFloatingPoint()) {
10791     // ...and the target is floating point...
10792     if (TargetBT && TargetBT->isFloatingPoint()) {
10793       // ...then warn if we're dropping FP rank.
10794 
10795       // Builtin FP kinds are ordered by increasing FP rank.
10796       if (SourceBT->getKind() > TargetBT->getKind()) {
10797         // Don't warn about float constants that are precisely
10798         // representable in the target type.
10799         Expr::EvalResult result;
10800         if (E->EvaluateAsRValue(result, S.Context)) {
10801           // Value might be a float, a float vector, or a float complex.
10802           if (IsSameFloatAfterCast(result.Val,
10803                    S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)),
10804                    S.Context.getFloatTypeSemantics(QualType(SourceBT, 0))))
10805             return;
10806         }
10807 
10808         if (S.SourceMgr.isInSystemMacro(CC))
10809           return;
10810 
10811         DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_float_precision);
10812       }
10813       // ... or possibly if we're increasing rank, too
10814       else if (TargetBT->getKind() > SourceBT->getKind()) {
10815         if (S.SourceMgr.isInSystemMacro(CC))
10816           return;
10817 
10818         DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_double_promotion);
10819       }
10820       return;
10821     }
10822 
10823     // If the target is integral, always warn.
10824     if (TargetBT && TargetBT->isInteger()) {
10825       if (S.SourceMgr.isInSystemMacro(CC))
10826         return;
10827 
10828       DiagnoseFloatingImpCast(S, E, T, CC);
10829     }
10830 
10831     // Detect the case where a call result is converted from floating-point to
10832     // to bool, and the final argument to the call is converted from bool, to
10833     // discover this typo:
10834     //
10835     //    bool b = fabs(x < 1.0);  // should be "bool b = fabs(x) < 1.0;"
10836     //
10837     // FIXME: This is an incredibly special case; is there some more general
10838     // way to detect this class of misplaced-parentheses bug?
10839     if (Target->isBooleanType() && isa<CallExpr>(E)) {
10840       // Check last argument of function call to see if it is an
10841       // implicit cast from a type matching the type the result
10842       // is being cast to.
10843       CallExpr *CEx = cast<CallExpr>(E);
10844       if (unsigned NumArgs = CEx->getNumArgs()) {
10845         Expr *LastA = CEx->getArg(NumArgs - 1);
10846         Expr *InnerE = LastA->IgnoreParenImpCasts();
10847         if (isa<ImplicitCastExpr>(LastA) &&
10848             InnerE->getType()->isBooleanType()) {
10849           // Warn on this floating-point to bool conversion
10850           DiagnoseImpCast(S, E, T, CC,
10851                           diag::warn_impcast_floating_point_to_bool);
10852         }
10853       }
10854     }
10855     return;
10856   }
10857 
10858   DiagnoseNullConversion(S, E, T, CC);
10859 
10860   S.DiscardMisalignedMemberAddress(Target, E);
10861 
10862   if (!Source->isIntegerType() || !Target->isIntegerType())
10863     return;
10864 
10865   // TODO: remove this early return once the false positives for constant->bool
10866   // in templates, macros, etc, are reduced or removed.
10867   if (Target->isSpecificBuiltinType(BuiltinType::Bool))
10868     return;
10869 
10870   IntRange SourceRange = GetExprRange(S.Context, E);
10871   IntRange TargetRange = IntRange::forTargetOfCanonicalType(S.Context, Target);
10872 
10873   if (SourceRange.Width > TargetRange.Width) {
10874     // If the source is a constant, use a default-on diagnostic.
10875     // TODO: this should happen for bitfield stores, too.
10876     llvm::APSInt Value(32);
10877     if (E->EvaluateAsInt(Value, S.Context, Expr::SE_AllowSideEffects)) {
10878       if (S.SourceMgr.isInSystemMacro(CC))
10879         return;
10880 
10881       std::string PrettySourceValue = Value.toString(10);
10882       std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);
10883 
10884       S.DiagRuntimeBehavior(E->getExprLoc(), E,
10885         S.PDiag(diag::warn_impcast_integer_precision_constant)
10886             << PrettySourceValue << PrettyTargetValue
10887             << E->getType() << T << E->getSourceRange()
10888             << clang::SourceRange(CC));
10889       return;
10890     }
10891 
10892     // People want to build with -Wshorten-64-to-32 and not -Wconversion.
10893     if (S.SourceMgr.isInSystemMacro(CC))
10894       return;
10895 
10896     if (TargetRange.Width == 32 && S.Context.getIntWidth(E->getType()) == 64)
10897       return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_64_32,
10898                              /* pruneControlFlow */ true);
10899     return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_precision);
10900   }
10901 
10902   if (TargetRange.Width > SourceRange.Width) {
10903     if (auto *UO = dyn_cast<UnaryOperator>(E))
10904       if (UO->getOpcode() == UO_Minus)
10905         if (Source->isUnsignedIntegerType()) {
10906           if (Target->isUnsignedIntegerType())
10907             return DiagnoseImpCast(S, E, T, CC,
10908                                    diag::warn_impcast_high_order_zero_bits);
10909           if (Target->isSignedIntegerType())
10910             return DiagnoseImpCast(S, E, T, CC,
10911                                    diag::warn_impcast_nonnegative_result);
10912         }
10913   }
10914 
10915   if (TargetRange.Width == SourceRange.Width && !TargetRange.NonNegative &&
10916       SourceRange.NonNegative && Source->isSignedIntegerType()) {
10917     // Warn when doing a signed to signed conversion, warn if the positive
10918     // source value is exactly the width of the target type, which will
10919     // cause a negative value to be stored.
10920 
10921     llvm::APSInt Value;
10922     if (E->EvaluateAsInt(Value, S.Context, Expr::SE_AllowSideEffects) &&
10923         !S.SourceMgr.isInSystemMacro(CC)) {
10924       if (isSameWidthConstantConversion(S, E, T, CC)) {
10925         std::string PrettySourceValue = Value.toString(10);
10926         std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);
10927 
10928         S.DiagRuntimeBehavior(
10929             E->getExprLoc(), E,
10930             S.PDiag(diag::warn_impcast_integer_precision_constant)
10931                 << PrettySourceValue << PrettyTargetValue << E->getType() << T
10932                 << E->getSourceRange() << clang::SourceRange(CC));
10933         return;
10934       }
10935     }
10936 
10937     // Fall through for non-constants to give a sign conversion warning.
10938   }
10939 
10940   if ((TargetRange.NonNegative && !SourceRange.NonNegative) ||
10941       (!TargetRange.NonNegative && SourceRange.NonNegative &&
10942        SourceRange.Width == TargetRange.Width)) {
10943     if (S.SourceMgr.isInSystemMacro(CC))
10944       return;
10945 
10946     unsigned DiagID = diag::warn_impcast_integer_sign;
10947 
10948     // Traditionally, gcc has warned about this under -Wsign-compare.
10949     // We also want to warn about it in -Wconversion.
10950     // So if -Wconversion is off, use a completely identical diagnostic
10951     // in the sign-compare group.
10952     // The conditional-checking code will
10953     if (ICContext) {
10954       DiagID = diag::warn_impcast_integer_sign_conditional;
10955       *ICContext = true;
10956     }
10957 
10958     return DiagnoseImpCast(S, E, T, CC, DiagID);
10959   }
10960 
10961   // Diagnose conversions between different enumeration types.
10962   // In C, we pretend that the type of an EnumConstantDecl is its enumeration
10963   // type, to give us better diagnostics.
10964   QualType SourceType = E->getType();
10965   if (!S.getLangOpts().CPlusPlus) {
10966     if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
10967       if (EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(DRE->getDecl())) {
10968         EnumDecl *Enum = cast<EnumDecl>(ECD->getDeclContext());
10969         SourceType = S.Context.getTypeDeclType(Enum);
10970         Source = S.Context.getCanonicalType(SourceType).getTypePtr();
10971       }
10972   }
10973 
10974   if (const EnumType *SourceEnum = Source->getAs<EnumType>())
10975     if (const EnumType *TargetEnum = Target->getAs<EnumType>())
10976       if (SourceEnum->getDecl()->hasNameForLinkage() &&
10977           TargetEnum->getDecl()->hasNameForLinkage() &&
10978           SourceEnum != TargetEnum) {
10979         if (S.SourceMgr.isInSystemMacro(CC))
10980           return;
10981 
10982         return DiagnoseImpCast(S, E, SourceType, T, CC,
10983                                diag::warn_impcast_different_enum_types);
10984       }
10985 }
10986 
10987 static void CheckConditionalOperator(Sema &S, ConditionalOperator *E,
10988                                      SourceLocation CC, QualType T);
10989 
10990 static void CheckConditionalOperand(Sema &S, Expr *E, QualType T,
10991                                     SourceLocation CC, bool &ICContext) {
10992   E = E->IgnoreParenImpCasts();
10993 
10994   if (isa<ConditionalOperator>(E))
10995     return CheckConditionalOperator(S, cast<ConditionalOperator>(E), CC, T);
10996 
10997   AnalyzeImplicitConversions(S, E, CC);
10998   if (E->getType() != T)
10999     return CheckImplicitConversion(S, E, T, CC, &ICContext);
11000 }
11001 
11002 static void CheckConditionalOperator(Sema &S, ConditionalOperator *E,
11003                                      SourceLocation CC, QualType T) {
11004   AnalyzeImplicitConversions(S, E->getCond(), E->getQuestionLoc());
11005 
11006   bool Suspicious = false;
11007   CheckConditionalOperand(S, E->getTrueExpr(), T, CC, Suspicious);
11008   CheckConditionalOperand(S, E->getFalseExpr(), T, CC, Suspicious);
11009 
11010   // If -Wconversion would have warned about either of the candidates
11011   // for a signedness conversion to the context type...
11012   if (!Suspicious) return;
11013 
11014   // ...but it's currently ignored...
11015   if (!S.Diags.isIgnored(diag::warn_impcast_integer_sign_conditional, CC))
11016     return;
11017 
11018   // ...then check whether it would have warned about either of the
11019   // candidates for a signedness conversion to the condition type.
11020   if (E->getType() == T) return;
11021 
11022   Suspicious = false;
11023   CheckImplicitConversion(S, E->getTrueExpr()->IgnoreParenImpCasts(),
11024                           E->getType(), CC, &Suspicious);
11025   if (!Suspicious)
11026     CheckImplicitConversion(S, E->getFalseExpr()->IgnoreParenImpCasts(),
11027                             E->getType(), CC, &Suspicious);
11028 }
11029 
11030 /// Check conversion of given expression to boolean.
11031 /// Input argument E is a logical expression.
11032 static void CheckBoolLikeConversion(Sema &S, Expr *E, SourceLocation CC) {
11033   if (S.getLangOpts().Bool)
11034     return;
11035   if (E->IgnoreParenImpCasts()->getType()->isAtomicType())
11036     return;
11037   CheckImplicitConversion(S, E->IgnoreParenImpCasts(), S.Context.BoolTy, CC);
11038 }
11039 
11040 /// AnalyzeImplicitConversions - Find and report any interesting
11041 /// implicit conversions in the given expression.  There are a couple
11042 /// of competing diagnostics here, -Wconversion and -Wsign-compare.
11043 static void AnalyzeImplicitConversions(Sema &S, Expr *OrigE,
11044                                        SourceLocation CC) {
11045   QualType T = OrigE->getType();
11046   Expr *E = OrigE->IgnoreParenImpCasts();
11047 
11048   if (E->isTypeDependent() || E->isValueDependent())
11049     return;
11050 
11051   // For conditional operators, we analyze the arguments as if they
11052   // were being fed directly into the output.
11053   if (isa<ConditionalOperator>(E)) {
11054     ConditionalOperator *CO = cast<ConditionalOperator>(E);
11055     CheckConditionalOperator(S, CO, CC, T);
11056     return;
11057   }
11058 
11059   // Check implicit argument conversions for function calls.
11060   if (CallExpr *Call = dyn_cast<CallExpr>(E))
11061     CheckImplicitArgumentConversions(S, Call, CC);
11062 
11063   // Go ahead and check any implicit conversions we might have skipped.
11064   // The non-canonical typecheck is just an optimization;
11065   // CheckImplicitConversion will filter out dead implicit conversions.
11066   if (E->getType() != T)
11067     CheckImplicitConversion(S, E, T, CC);
11068 
11069   // Now continue drilling into this expression.
11070 
11071   if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) {
11072     // The bound subexpressions in a PseudoObjectExpr are not reachable
11073     // as transitive children.
11074     // FIXME: Use a more uniform representation for this.
11075     for (auto *SE : POE->semantics())
11076       if (auto *OVE = dyn_cast<OpaqueValueExpr>(SE))
11077         AnalyzeImplicitConversions(S, OVE->getSourceExpr(), CC);
11078   }
11079 
11080   // Skip past explicit casts.
11081   if (auto *CE = dyn_cast<ExplicitCastExpr>(E)) {
11082     E = CE->getSubExpr()->IgnoreParenImpCasts();
11083     if (!CE->getType()->isVoidType() && E->getType()->isAtomicType())
11084       S.Diag(E->getBeginLoc(), diag::warn_atomic_implicit_seq_cst);
11085     return AnalyzeImplicitConversions(S, E, CC);
11086   }
11087 
11088   if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
11089     // Do a somewhat different check with comparison operators.
11090     if (BO->isComparisonOp())
11091       return AnalyzeComparison(S, BO);
11092 
11093     // And with simple assignments.
11094     if (BO->getOpcode() == BO_Assign)
11095       return AnalyzeAssignment(S, BO);
11096     // And with compound assignments.
11097     if (BO->isAssignmentOp())
11098       return AnalyzeCompoundAssignment(S, BO);
11099   }
11100 
11101   // These break the otherwise-useful invariant below.  Fortunately,
11102   // we don't really need to recurse into them, because any internal
11103   // expressions should have been analyzed already when they were
11104   // built into statements.
11105   if (isa<StmtExpr>(E)) return;
11106 
11107   // Don't descend into unevaluated contexts.
11108   if (isa<UnaryExprOrTypeTraitExpr>(E)) return;
11109 
11110   // Now just recurse over the expression's children.
11111   CC = E->getExprLoc();
11112   BinaryOperator *BO = dyn_cast<BinaryOperator>(E);
11113   bool IsLogicalAndOperator = BO && BO->getOpcode() == BO_LAnd;
11114   for (Stmt *SubStmt : E->children()) {
11115     Expr *ChildExpr = dyn_cast_or_null<Expr>(SubStmt);
11116     if (!ChildExpr)
11117       continue;
11118 
11119     if (IsLogicalAndOperator &&
11120         isa<StringLiteral>(ChildExpr->IgnoreParenImpCasts()))
11121       // Ignore checking string literals that are in logical and operators.
11122       // This is a common pattern for asserts.
11123       continue;
11124     AnalyzeImplicitConversions(S, ChildExpr, CC);
11125   }
11126 
11127   if (BO && BO->isLogicalOp()) {
11128     Expr *SubExpr = BO->getLHS()->IgnoreParenImpCasts();
11129     if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
11130       ::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());
11131 
11132     SubExpr = BO->getRHS()->IgnoreParenImpCasts();
11133     if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
11134       ::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());
11135   }
11136 
11137   if (const UnaryOperator *U = dyn_cast<UnaryOperator>(E)) {
11138     if (U->getOpcode() == UO_LNot) {
11139       ::CheckBoolLikeConversion(S, U->getSubExpr(), CC);
11140     } else if (U->getOpcode() != UO_AddrOf) {
11141       if (U->getSubExpr()->getType()->isAtomicType())
11142         S.Diag(U->getSubExpr()->getBeginLoc(),
11143                diag::warn_atomic_implicit_seq_cst);
11144     }
11145   }
11146 }
11147 
11148 /// Diagnose integer type and any valid implicit conversion to it.
11149 static bool checkOpenCLEnqueueIntType(Sema &S, Expr *E, const QualType &IntT) {
11150   // Taking into account implicit conversions,
11151   // allow any integer.
11152   if (!E->getType()->isIntegerType()) {
11153     S.Diag(E->getBeginLoc(),
11154            diag::err_opencl_enqueue_kernel_invalid_local_size_type);
11155     return true;
11156   }
11157   // Potentially emit standard warnings for implicit conversions if enabled
11158   // using -Wconversion.
11159   CheckImplicitConversion(S, E, IntT, E->getBeginLoc());
11160   return false;
11161 }
11162 
11163 // Helper function for Sema::DiagnoseAlwaysNonNullPointer.
11164 // Returns true when emitting a warning about taking the address of a reference.
11165 static bool CheckForReference(Sema &SemaRef, const Expr *E,
11166                               const PartialDiagnostic &PD) {
11167   E = E->IgnoreParenImpCasts();
11168 
11169   const FunctionDecl *FD = nullptr;
11170 
11171   if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
11172     if (!DRE->getDecl()->getType()->isReferenceType())
11173       return false;
11174   } else if (const MemberExpr *M = dyn_cast<MemberExpr>(E)) {
11175     if (!M->getMemberDecl()->getType()->isReferenceType())
11176       return false;
11177   } else if (const CallExpr *Call = dyn_cast<CallExpr>(E)) {
11178     if (!Call->getCallReturnType(SemaRef.Context)->isReferenceType())
11179       return false;
11180     FD = Call->getDirectCallee();
11181   } else {
11182     return false;
11183   }
11184 
11185   SemaRef.Diag(E->getExprLoc(), PD);
11186 
11187   // If possible, point to location of function.
11188   if (FD) {
11189     SemaRef.Diag(FD->getLocation(), diag::note_reference_is_return_value) << FD;
11190   }
11191 
11192   return true;
11193 }
11194 
11195 // Returns true if the SourceLocation is expanded from any macro body.
11196 // Returns false if the SourceLocation is invalid, is from not in a macro
11197 // expansion, or is from expanded from a top-level macro argument.
11198 static bool IsInAnyMacroBody(const SourceManager &SM, SourceLocation Loc) {
11199   if (Loc.isInvalid())
11200     return false;
11201 
11202   while (Loc.isMacroID()) {
11203     if (SM.isMacroBodyExpansion(Loc))
11204       return true;
11205     Loc = SM.getImmediateMacroCallerLoc(Loc);
11206   }
11207 
11208   return false;
11209 }
11210 
11211 /// Diagnose pointers that are always non-null.
11212 /// \param E the expression containing the pointer
11213 /// \param NullKind NPCK_NotNull if E is a cast to bool, otherwise, E is
11214 /// compared to a null pointer
11215 /// \param IsEqual True when the comparison is equal to a null pointer
11216 /// \param Range Extra SourceRange to highlight in the diagnostic
11217 void Sema::DiagnoseAlwaysNonNullPointer(Expr *E,
11218                                         Expr::NullPointerConstantKind NullKind,
11219                                         bool IsEqual, SourceRange Range) {
11220   if (!E)
11221     return;
11222 
11223   // Don't warn inside macros.
11224   if (E->getExprLoc().isMacroID()) {
11225     const SourceManager &SM = getSourceManager();
11226     if (IsInAnyMacroBody(SM, E->getExprLoc()) ||
11227         IsInAnyMacroBody(SM, Range.getBegin()))
11228       return;
11229   }
11230   E = E->IgnoreImpCasts();
11231 
11232   const bool IsCompare = NullKind != Expr::NPCK_NotNull;
11233 
11234   if (isa<CXXThisExpr>(E)) {
11235     unsigned DiagID = IsCompare ? diag::warn_this_null_compare
11236                                 : diag::warn_this_bool_conversion;
11237     Diag(E->getExprLoc(), DiagID) << E->getSourceRange() << Range << IsEqual;
11238     return;
11239   }
11240 
11241   bool IsAddressOf = false;
11242 
11243   if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
11244     if (UO->getOpcode() != UO_AddrOf)
11245       return;
11246     IsAddressOf = true;
11247     E = UO->getSubExpr();
11248   }
11249 
11250   if (IsAddressOf) {
11251     unsigned DiagID = IsCompare
11252                           ? diag::warn_address_of_reference_null_compare
11253                           : diag::warn_address_of_reference_bool_conversion;
11254     PartialDiagnostic PD = PDiag(DiagID) << E->getSourceRange() << Range
11255                                          << IsEqual;
11256     if (CheckForReference(*this, E, PD)) {
11257       return;
11258     }
11259   }
11260 
11261   auto ComplainAboutNonnullParamOrCall = [&](const Attr *NonnullAttr) {
11262     bool IsParam = isa<NonNullAttr>(NonnullAttr);
11263     std::string Str;
11264     llvm::raw_string_ostream S(Str);
11265     E->printPretty(S, nullptr, getPrintingPolicy());
11266     unsigned DiagID = IsCompare ? diag::warn_nonnull_expr_compare
11267                                 : diag::warn_cast_nonnull_to_bool;
11268     Diag(E->getExprLoc(), DiagID) << IsParam << S.str()
11269       << E->getSourceRange() << Range << IsEqual;
11270     Diag(NonnullAttr->getLocation(), diag::note_declared_nonnull) << IsParam;
11271   };
11272 
11273   // If we have a CallExpr that is tagged with returns_nonnull, we can complain.
11274   if (auto *Call = dyn_cast<CallExpr>(E->IgnoreParenImpCasts())) {
11275     if (auto *Callee = Call->getDirectCallee()) {
11276       if (const Attr *A = Callee->getAttr<ReturnsNonNullAttr>()) {
11277         ComplainAboutNonnullParamOrCall(A);
11278         return;
11279       }
11280     }
11281   }
11282 
11283   // Expect to find a single Decl.  Skip anything more complicated.
11284   ValueDecl *D = nullptr;
11285   if (DeclRefExpr *R = dyn_cast<DeclRefExpr>(E)) {
11286     D = R->getDecl();
11287   } else if (MemberExpr *M = dyn_cast<MemberExpr>(E)) {
11288     D = M->getMemberDecl();
11289   }
11290 
11291   // Weak Decls can be null.
11292   if (!D || D->isWeak())
11293     return;
11294 
11295   // Check for parameter decl with nonnull attribute
11296   if (const auto* PV = dyn_cast<ParmVarDecl>(D)) {
11297     if (getCurFunction() &&
11298         !getCurFunction()->ModifiedNonNullParams.count(PV)) {
11299       if (const Attr *A = PV->getAttr<NonNullAttr>()) {
11300         ComplainAboutNonnullParamOrCall(A);
11301         return;
11302       }
11303 
11304       if (const auto *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) {
11305         auto ParamIter = llvm::find(FD->parameters(), PV);
11306         assert(ParamIter != FD->param_end());
11307         unsigned ParamNo = std::distance(FD->param_begin(), ParamIter);
11308 
11309         for (const auto *NonNull : FD->specific_attrs<NonNullAttr>()) {
11310           if (!NonNull->args_size()) {
11311               ComplainAboutNonnullParamOrCall(NonNull);
11312               return;
11313           }
11314 
11315           for (const ParamIdx &ArgNo : NonNull->args()) {
11316             if (ArgNo.getASTIndex() == ParamNo) {
11317               ComplainAboutNonnullParamOrCall(NonNull);
11318               return;
11319             }
11320           }
11321         }
11322       }
11323     }
11324   }
11325 
11326   QualType T = D->getType();
11327   const bool IsArray = T->isArrayType();
11328   const bool IsFunction = T->isFunctionType();
11329 
11330   // Address of function is used to silence the function warning.
11331   if (IsAddressOf && IsFunction) {
11332     return;
11333   }
11334 
11335   // Found nothing.
11336   if (!IsAddressOf && !IsFunction && !IsArray)
11337     return;
11338 
11339   // Pretty print the expression for the diagnostic.
11340   std::string Str;
11341   llvm::raw_string_ostream S(Str);
11342   E->printPretty(S, nullptr, getPrintingPolicy());
11343 
11344   unsigned DiagID = IsCompare ? diag::warn_null_pointer_compare
11345                               : diag::warn_impcast_pointer_to_bool;
11346   enum {
11347     AddressOf,
11348     FunctionPointer,
11349     ArrayPointer
11350   } DiagType;
11351   if (IsAddressOf)
11352     DiagType = AddressOf;
11353   else if (IsFunction)
11354     DiagType = FunctionPointer;
11355   else if (IsArray)
11356     DiagType = ArrayPointer;
11357   else
11358     llvm_unreachable("Could not determine diagnostic.");
11359   Diag(E->getExprLoc(), DiagID) << DiagType << S.str() << E->getSourceRange()
11360                                 << Range << IsEqual;
11361 
11362   if (!IsFunction)
11363     return;
11364 
11365   // Suggest '&' to silence the function warning.
11366   Diag(E->getExprLoc(), diag::note_function_warning_silence)
11367       << FixItHint::CreateInsertion(E->getBeginLoc(), "&");
11368 
11369   // Check to see if '()' fixit should be emitted.
11370   QualType ReturnType;
11371   UnresolvedSet<4> NonTemplateOverloads;
11372   tryExprAsCall(*E, ReturnType, NonTemplateOverloads);
11373   if (ReturnType.isNull())
11374     return;
11375 
11376   if (IsCompare) {
11377     // There are two cases here.  If there is null constant, the only suggest
11378     // for a pointer return type.  If the null is 0, then suggest if the return
11379     // type is a pointer or an integer type.
11380     if (!ReturnType->isPointerType()) {
11381       if (NullKind == Expr::NPCK_ZeroExpression ||
11382           NullKind == Expr::NPCK_ZeroLiteral) {
11383         if (!ReturnType->isIntegerType())
11384           return;
11385       } else {
11386         return;
11387       }
11388     }
11389   } else { // !IsCompare
11390     // For function to bool, only suggest if the function pointer has bool
11391     // return type.
11392     if (!ReturnType->isSpecificBuiltinType(BuiltinType::Bool))
11393       return;
11394   }
11395   Diag(E->getExprLoc(), diag::note_function_to_function_call)
11396       << FixItHint::CreateInsertion(getLocForEndOfToken(E->getEndLoc()), "()");
11397 }
11398 
11399 /// Diagnoses "dangerous" implicit conversions within the given
11400 /// expression (which is a full expression).  Implements -Wconversion
11401 /// and -Wsign-compare.
11402 ///
11403 /// \param CC the "context" location of the implicit conversion, i.e.
11404 ///   the most location of the syntactic entity requiring the implicit
11405 ///   conversion
11406 void Sema::CheckImplicitConversions(Expr *E, SourceLocation CC) {
11407   // Don't diagnose in unevaluated contexts.
11408   if (isUnevaluatedContext())
11409     return;
11410 
11411   // Don't diagnose for value- or type-dependent expressions.
11412   if (E->isTypeDependent() || E->isValueDependent())
11413     return;
11414 
11415   // Check for array bounds violations in cases where the check isn't triggered
11416   // elsewhere for other Expr types (like BinaryOperators), e.g. when an
11417   // ArraySubscriptExpr is on the RHS of a variable initialization.
11418   CheckArrayAccess(E);
11419 
11420   // This is not the right CC for (e.g.) a variable initialization.
11421   AnalyzeImplicitConversions(*this, E, CC);
11422 }
11423 
11424 /// CheckBoolLikeConversion - Check conversion of given expression to boolean.
11425 /// Input argument E is a logical expression.
11426 void Sema::CheckBoolLikeConversion(Expr *E, SourceLocation CC) {
11427   ::CheckBoolLikeConversion(*this, E, CC);
11428 }
11429 
11430 /// Diagnose when expression is an integer constant expression and its evaluation
11431 /// results in integer overflow
11432 void Sema::CheckForIntOverflow (Expr *E) {
11433   // Use a work list to deal with nested struct initializers.
11434   SmallVector<Expr *, 2> Exprs(1, E);
11435 
11436   do {
11437     Expr *OriginalE = Exprs.pop_back_val();
11438     Expr *E = OriginalE->IgnoreParenCasts();
11439 
11440     if (isa<BinaryOperator>(E)) {
11441       E->EvaluateForOverflow(Context);
11442       continue;
11443     }
11444 
11445     if (auto InitList = dyn_cast<InitListExpr>(OriginalE))
11446       Exprs.append(InitList->inits().begin(), InitList->inits().end());
11447     else if (isa<ObjCBoxedExpr>(OriginalE))
11448       E->EvaluateForOverflow(Context);
11449     else if (auto Call = dyn_cast<CallExpr>(E))
11450       Exprs.append(Call->arg_begin(), Call->arg_end());
11451     else if (auto Message = dyn_cast<ObjCMessageExpr>(E))
11452       Exprs.append(Message->arg_begin(), Message->arg_end());
11453   } while (!Exprs.empty());
11454 }
11455 
11456 namespace {
11457 
11458 /// Visitor for expressions which looks for unsequenced operations on the
11459 /// same object.
11460 class SequenceChecker : public EvaluatedExprVisitor<SequenceChecker> {
11461   using Base = EvaluatedExprVisitor<SequenceChecker>;
11462 
11463   /// A tree of sequenced regions within an expression. Two regions are
11464   /// unsequenced if one is an ancestor or a descendent of the other. When we
11465   /// finish processing an expression with sequencing, such as a comma
11466   /// expression, we fold its tree nodes into its parent, since they are
11467   /// unsequenced with respect to nodes we will visit later.
11468   class SequenceTree {
11469     struct Value {
11470       explicit Value(unsigned Parent) : Parent(Parent), Merged(false) {}
11471       unsigned Parent : 31;
11472       unsigned Merged : 1;
11473     };
11474     SmallVector<Value, 8> Values;
11475 
11476   public:
11477     /// A region within an expression which may be sequenced with respect
11478     /// to some other region.
11479     class Seq {
11480       friend class SequenceTree;
11481 
11482       unsigned Index = 0;
11483 
11484       explicit Seq(unsigned N) : Index(N) {}
11485 
11486     public:
11487       Seq() = default;
11488     };
11489 
11490     SequenceTree() { Values.push_back(Value(0)); }
11491     Seq root() const { return Seq(0); }
11492 
11493     /// Create a new sequence of operations, which is an unsequenced
11494     /// subset of \p Parent. This sequence of operations is sequenced with
11495     /// respect to other children of \p Parent.
11496     Seq allocate(Seq Parent) {
11497       Values.push_back(Value(Parent.Index));
11498       return Seq(Values.size() - 1);
11499     }
11500 
11501     /// Merge a sequence of operations into its parent.
11502     void merge(Seq S) {
11503       Values[S.Index].Merged = true;
11504     }
11505 
11506     /// Determine whether two operations are unsequenced. This operation
11507     /// is asymmetric: \p Cur should be the more recent sequence, and \p Old
11508     /// should have been merged into its parent as appropriate.
11509     bool isUnsequenced(Seq Cur, Seq Old) {
11510       unsigned C = representative(Cur.Index);
11511       unsigned Target = representative(Old.Index);
11512       while (C >= Target) {
11513         if (C == Target)
11514           return true;
11515         C = Values[C].Parent;
11516       }
11517       return false;
11518     }
11519 
11520   private:
11521     /// Pick a representative for a sequence.
11522     unsigned representative(unsigned K) {
11523       if (Values[K].Merged)
11524         // Perform path compression as we go.
11525         return Values[K].Parent = representative(Values[K].Parent);
11526       return K;
11527     }
11528   };
11529 
11530   /// An object for which we can track unsequenced uses.
11531   using Object = NamedDecl *;
11532 
11533   /// Different flavors of object usage which we track. We only track the
11534   /// least-sequenced usage of each kind.
11535   enum UsageKind {
11536     /// A read of an object. Multiple unsequenced reads are OK.
11537     UK_Use,
11538 
11539     /// A modification of an object which is sequenced before the value
11540     /// computation of the expression, such as ++n in C++.
11541     UK_ModAsValue,
11542 
11543     /// A modification of an object which is not sequenced before the value
11544     /// computation of the expression, such as n++.
11545     UK_ModAsSideEffect,
11546 
11547     UK_Count = UK_ModAsSideEffect + 1
11548   };
11549 
11550   struct Usage {
11551     Expr *Use = nullptr;
11552     SequenceTree::Seq Seq;
11553 
11554     Usage() = default;
11555   };
11556 
11557   struct UsageInfo {
11558     Usage Uses[UK_Count];
11559 
11560     /// Have we issued a diagnostic for this variable already?
11561     bool Diagnosed = false;
11562 
11563     UsageInfo() = default;
11564   };
11565   using UsageInfoMap = llvm::SmallDenseMap<Object, UsageInfo, 16>;
11566 
11567   Sema &SemaRef;
11568 
11569   /// Sequenced regions within the expression.
11570   SequenceTree Tree;
11571 
11572   /// Declaration modifications and references which we have seen.
11573   UsageInfoMap UsageMap;
11574 
11575   /// The region we are currently within.
11576   SequenceTree::Seq Region;
11577 
11578   /// Filled in with declarations which were modified as a side-effect
11579   /// (that is, post-increment operations).
11580   SmallVectorImpl<std::pair<Object, Usage>> *ModAsSideEffect = nullptr;
11581 
11582   /// Expressions to check later. We defer checking these to reduce
11583   /// stack usage.
11584   SmallVectorImpl<Expr *> &WorkList;
11585 
11586   /// RAII object wrapping the visitation of a sequenced subexpression of an
11587   /// expression. At the end of this process, the side-effects of the evaluation
11588   /// become sequenced with respect to the value computation of the result, so
11589   /// we downgrade any UK_ModAsSideEffect within the evaluation to
11590   /// UK_ModAsValue.
11591   struct SequencedSubexpression {
11592     SequencedSubexpression(SequenceChecker &Self)
11593       : Self(Self), OldModAsSideEffect(Self.ModAsSideEffect) {
11594       Self.ModAsSideEffect = &ModAsSideEffect;
11595     }
11596 
11597     ~SequencedSubexpression() {
11598       for (auto &M : llvm::reverse(ModAsSideEffect)) {
11599         UsageInfo &U = Self.UsageMap[M.first];
11600         auto &SideEffectUsage = U.Uses[UK_ModAsSideEffect];
11601         Self.addUsage(U, M.first, SideEffectUsage.Use, UK_ModAsValue);
11602         SideEffectUsage = M.second;
11603       }
11604       Self.ModAsSideEffect = OldModAsSideEffect;
11605     }
11606 
11607     SequenceChecker &Self;
11608     SmallVector<std::pair<Object, Usage>, 4> ModAsSideEffect;
11609     SmallVectorImpl<std::pair<Object, Usage>> *OldModAsSideEffect;
11610   };
11611 
11612   /// RAII object wrapping the visitation of a subexpression which we might
11613   /// choose to evaluate as a constant. If any subexpression is evaluated and
11614   /// found to be non-constant, this allows us to suppress the evaluation of
11615   /// the outer expression.
11616   class EvaluationTracker {
11617   public:
11618     EvaluationTracker(SequenceChecker &Self)
11619         : Self(Self), Prev(Self.EvalTracker) {
11620       Self.EvalTracker = this;
11621     }
11622 
11623     ~EvaluationTracker() {
11624       Self.EvalTracker = Prev;
11625       if (Prev)
11626         Prev->EvalOK &= EvalOK;
11627     }
11628 
11629     bool evaluate(const Expr *E, bool &Result) {
11630       if (!EvalOK || E->isValueDependent())
11631         return false;
11632       EvalOK = E->EvaluateAsBooleanCondition(Result, Self.SemaRef.Context);
11633       return EvalOK;
11634     }
11635 
11636   private:
11637     SequenceChecker &Self;
11638     EvaluationTracker *Prev;
11639     bool EvalOK = true;
11640   } *EvalTracker = nullptr;
11641 
11642   /// Find the object which is produced by the specified expression,
11643   /// if any.
11644   Object getObject(Expr *E, bool Mod) const {
11645     E = E->IgnoreParenCasts();
11646     if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
11647       if (Mod && (UO->getOpcode() == UO_PreInc || UO->getOpcode() == UO_PreDec))
11648         return getObject(UO->getSubExpr(), Mod);
11649     } else if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
11650       if (BO->getOpcode() == BO_Comma)
11651         return getObject(BO->getRHS(), Mod);
11652       if (Mod && BO->isAssignmentOp())
11653         return getObject(BO->getLHS(), Mod);
11654     } else if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
11655       // FIXME: Check for more interesting cases, like "x.n = ++x.n".
11656       if (isa<CXXThisExpr>(ME->getBase()->IgnoreParenCasts()))
11657         return ME->getMemberDecl();
11658     } else if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
11659       // FIXME: If this is a reference, map through to its value.
11660       return DRE->getDecl();
11661     return nullptr;
11662   }
11663 
11664   /// Note that an object was modified or used by an expression.
11665   void addUsage(UsageInfo &UI, Object O, Expr *Ref, UsageKind UK) {
11666     Usage &U = UI.Uses[UK];
11667     if (!U.Use || !Tree.isUnsequenced(Region, U.Seq)) {
11668       if (UK == UK_ModAsSideEffect && ModAsSideEffect)
11669         ModAsSideEffect->push_back(std::make_pair(O, U));
11670       U.Use = Ref;
11671       U.Seq = Region;
11672     }
11673   }
11674 
11675   /// Check whether a modification or use conflicts with a prior usage.
11676   void checkUsage(Object O, UsageInfo &UI, Expr *Ref, UsageKind OtherKind,
11677                   bool IsModMod) {
11678     if (UI.Diagnosed)
11679       return;
11680 
11681     const Usage &U = UI.Uses[OtherKind];
11682     if (!U.Use || !Tree.isUnsequenced(Region, U.Seq))
11683       return;
11684 
11685     Expr *Mod = U.Use;
11686     Expr *ModOrUse = Ref;
11687     if (OtherKind == UK_Use)
11688       std::swap(Mod, ModOrUse);
11689 
11690     SemaRef.Diag(Mod->getExprLoc(),
11691                  IsModMod ? diag::warn_unsequenced_mod_mod
11692                           : diag::warn_unsequenced_mod_use)
11693       << O << SourceRange(ModOrUse->getExprLoc());
11694     UI.Diagnosed = true;
11695   }
11696 
11697   void notePreUse(Object O, Expr *Use) {
11698     UsageInfo &U = UsageMap[O];
11699     // Uses conflict with other modifications.
11700     checkUsage(O, U, Use, UK_ModAsValue, false);
11701   }
11702 
11703   void notePostUse(Object O, Expr *Use) {
11704     UsageInfo &U = UsageMap[O];
11705     checkUsage(O, U, Use, UK_ModAsSideEffect, false);
11706     addUsage(U, O, Use, UK_Use);
11707   }
11708 
11709   void notePreMod(Object O, Expr *Mod) {
11710     UsageInfo &U = UsageMap[O];
11711     // Modifications conflict with other modifications and with uses.
11712     checkUsage(O, U, Mod, UK_ModAsValue, true);
11713     checkUsage(O, U, Mod, UK_Use, false);
11714   }
11715 
11716   void notePostMod(Object O, Expr *Use, UsageKind UK) {
11717     UsageInfo &U = UsageMap[O];
11718     checkUsage(O, U, Use, UK_ModAsSideEffect, true);
11719     addUsage(U, O, Use, UK);
11720   }
11721 
11722 public:
11723   SequenceChecker(Sema &S, Expr *E, SmallVectorImpl<Expr *> &WorkList)
11724       : Base(S.Context), SemaRef(S), Region(Tree.root()), WorkList(WorkList) {
11725     Visit(E);
11726   }
11727 
11728   void VisitStmt(Stmt *S) {
11729     // Skip all statements which aren't expressions for now.
11730   }
11731 
11732   void VisitExpr(Expr *E) {
11733     // By default, just recurse to evaluated subexpressions.
11734     Base::VisitStmt(E);
11735   }
11736 
11737   void VisitCastExpr(CastExpr *E) {
11738     Object O = Object();
11739     if (E->getCastKind() == CK_LValueToRValue)
11740       O = getObject(E->getSubExpr(), false);
11741 
11742     if (O)
11743       notePreUse(O, E);
11744     VisitExpr(E);
11745     if (O)
11746       notePostUse(O, E);
11747   }
11748 
11749   void VisitBinComma(BinaryOperator *BO) {
11750     // C++11 [expr.comma]p1:
11751     //   Every value computation and side effect associated with the left
11752     //   expression is sequenced before every value computation and side
11753     //   effect associated with the right expression.
11754     SequenceTree::Seq LHS = Tree.allocate(Region);
11755     SequenceTree::Seq RHS = Tree.allocate(Region);
11756     SequenceTree::Seq OldRegion = Region;
11757 
11758     {
11759       SequencedSubexpression SeqLHS(*this);
11760       Region = LHS;
11761       Visit(BO->getLHS());
11762     }
11763 
11764     Region = RHS;
11765     Visit(BO->getRHS());
11766 
11767     Region = OldRegion;
11768 
11769     // Forget that LHS and RHS are sequenced. They are both unsequenced
11770     // with respect to other stuff.
11771     Tree.merge(LHS);
11772     Tree.merge(RHS);
11773   }
11774 
11775   void VisitBinAssign(BinaryOperator *BO) {
11776     // The modification is sequenced after the value computation of the LHS
11777     // and RHS, so check it before inspecting the operands and update the
11778     // map afterwards.
11779     Object O = getObject(BO->getLHS(), true);
11780     if (!O)
11781       return VisitExpr(BO);
11782 
11783     notePreMod(O, BO);
11784 
11785     // C++11 [expr.ass]p7:
11786     //   E1 op= E2 is equivalent to E1 = E1 op E2, except that E1 is evaluated
11787     //   only once.
11788     //
11789     // Therefore, for a compound assignment operator, O is considered used
11790     // everywhere except within the evaluation of E1 itself.
11791     if (isa<CompoundAssignOperator>(BO))
11792       notePreUse(O, BO);
11793 
11794     Visit(BO->getLHS());
11795 
11796     if (isa<CompoundAssignOperator>(BO))
11797       notePostUse(O, BO);
11798 
11799     Visit(BO->getRHS());
11800 
11801     // C++11 [expr.ass]p1:
11802     //   the assignment is sequenced [...] before the value computation of the
11803     //   assignment expression.
11804     // C11 6.5.16/3 has no such rule.
11805     notePostMod(O, BO, SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
11806                                                        : UK_ModAsSideEffect);
11807   }
11808 
11809   void VisitCompoundAssignOperator(CompoundAssignOperator *CAO) {
11810     VisitBinAssign(CAO);
11811   }
11812 
11813   void VisitUnaryPreInc(UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
11814   void VisitUnaryPreDec(UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
11815   void VisitUnaryPreIncDec(UnaryOperator *UO) {
11816     Object O = getObject(UO->getSubExpr(), true);
11817     if (!O)
11818       return VisitExpr(UO);
11819 
11820     notePreMod(O, UO);
11821     Visit(UO->getSubExpr());
11822     // C++11 [expr.pre.incr]p1:
11823     //   the expression ++x is equivalent to x+=1
11824     notePostMod(O, UO, SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
11825                                                        : UK_ModAsSideEffect);
11826   }
11827 
11828   void VisitUnaryPostInc(UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
11829   void VisitUnaryPostDec(UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
11830   void VisitUnaryPostIncDec(UnaryOperator *UO) {
11831     Object O = getObject(UO->getSubExpr(), true);
11832     if (!O)
11833       return VisitExpr(UO);
11834 
11835     notePreMod(O, UO);
11836     Visit(UO->getSubExpr());
11837     notePostMod(O, UO, UK_ModAsSideEffect);
11838   }
11839 
11840   /// Don't visit the RHS of '&&' or '||' if it might not be evaluated.
11841   void VisitBinLOr(BinaryOperator *BO) {
11842     // The side-effects of the LHS of an '&&' are sequenced before the
11843     // value computation of the RHS, and hence before the value computation
11844     // of the '&&' itself, unless the LHS evaluates to zero. We treat them
11845     // as if they were unconditionally sequenced.
11846     EvaluationTracker Eval(*this);
11847     {
11848       SequencedSubexpression Sequenced(*this);
11849       Visit(BO->getLHS());
11850     }
11851 
11852     bool Result;
11853     if (Eval.evaluate(BO->getLHS(), Result)) {
11854       if (!Result)
11855         Visit(BO->getRHS());
11856     } else {
11857       // Check for unsequenced operations in the RHS, treating it as an
11858       // entirely separate evaluation.
11859       //
11860       // FIXME: If there are operations in the RHS which are unsequenced
11861       // with respect to operations outside the RHS, and those operations
11862       // are unconditionally evaluated, diagnose them.
11863       WorkList.push_back(BO->getRHS());
11864     }
11865   }
11866   void VisitBinLAnd(BinaryOperator *BO) {
11867     EvaluationTracker Eval(*this);
11868     {
11869       SequencedSubexpression Sequenced(*this);
11870       Visit(BO->getLHS());
11871     }
11872 
11873     bool Result;
11874     if (Eval.evaluate(BO->getLHS(), Result)) {
11875       if (Result)
11876         Visit(BO->getRHS());
11877     } else {
11878       WorkList.push_back(BO->getRHS());
11879     }
11880   }
11881 
11882   // Only visit the condition, unless we can be sure which subexpression will
11883   // be chosen.
11884   void VisitAbstractConditionalOperator(AbstractConditionalOperator *CO) {
11885     EvaluationTracker Eval(*this);
11886     {
11887       SequencedSubexpression Sequenced(*this);
11888       Visit(CO->getCond());
11889     }
11890 
11891     bool Result;
11892     if (Eval.evaluate(CO->getCond(), Result))
11893       Visit(Result ? CO->getTrueExpr() : CO->getFalseExpr());
11894     else {
11895       WorkList.push_back(CO->getTrueExpr());
11896       WorkList.push_back(CO->getFalseExpr());
11897     }
11898   }
11899 
11900   void VisitCallExpr(CallExpr *CE) {
11901     // C++11 [intro.execution]p15:
11902     //   When calling a function [...], every value computation and side effect
11903     //   associated with any argument expression, or with the postfix expression
11904     //   designating the called function, is sequenced before execution of every
11905     //   expression or statement in the body of the function [and thus before
11906     //   the value computation of its result].
11907     SequencedSubexpression Sequenced(*this);
11908     Base::VisitCallExpr(CE);
11909 
11910     // FIXME: CXXNewExpr and CXXDeleteExpr implicitly call functions.
11911   }
11912 
11913   void VisitCXXConstructExpr(CXXConstructExpr *CCE) {
11914     // This is a call, so all subexpressions are sequenced before the result.
11915     SequencedSubexpression Sequenced(*this);
11916 
11917     if (!CCE->isListInitialization())
11918       return VisitExpr(CCE);
11919 
11920     // In C++11, list initializations are sequenced.
11921     SmallVector<SequenceTree::Seq, 32> Elts;
11922     SequenceTree::Seq Parent = Region;
11923     for (CXXConstructExpr::arg_iterator I = CCE->arg_begin(),
11924                                         E = CCE->arg_end();
11925          I != E; ++I) {
11926       Region = Tree.allocate(Parent);
11927       Elts.push_back(Region);
11928       Visit(*I);
11929     }
11930 
11931     // Forget that the initializers are sequenced.
11932     Region = Parent;
11933     for (unsigned I = 0; I < Elts.size(); ++I)
11934       Tree.merge(Elts[I]);
11935   }
11936 
11937   void VisitInitListExpr(InitListExpr *ILE) {
11938     if (!SemaRef.getLangOpts().CPlusPlus11)
11939       return VisitExpr(ILE);
11940 
11941     // In C++11, list initializations are sequenced.
11942     SmallVector<SequenceTree::Seq, 32> Elts;
11943     SequenceTree::Seq Parent = Region;
11944     for (unsigned I = 0; I < ILE->getNumInits(); ++I) {
11945       Expr *E = ILE->getInit(I);
11946       if (!E) continue;
11947       Region = Tree.allocate(Parent);
11948       Elts.push_back(Region);
11949       Visit(E);
11950     }
11951 
11952     // Forget that the initializers are sequenced.
11953     Region = Parent;
11954     for (unsigned I = 0; I < Elts.size(); ++I)
11955       Tree.merge(Elts[I]);
11956   }
11957 };
11958 
11959 } // namespace
11960 
11961 void Sema::CheckUnsequencedOperations(Expr *E) {
11962   SmallVector<Expr *, 8> WorkList;
11963   WorkList.push_back(E);
11964   while (!WorkList.empty()) {
11965     Expr *Item = WorkList.pop_back_val();
11966     SequenceChecker(*this, Item, WorkList);
11967   }
11968 }
11969 
11970 void Sema::CheckCompletedExpr(Expr *E, SourceLocation CheckLoc,
11971                               bool IsConstexpr) {
11972   CheckImplicitConversions(E, CheckLoc);
11973   if (!E->isInstantiationDependent())
11974     CheckUnsequencedOperations(E);
11975   if (!IsConstexpr && !E->isValueDependent())
11976     CheckForIntOverflow(E);
11977   DiagnoseMisalignedMembers();
11978 }
11979 
11980 void Sema::CheckBitFieldInitialization(SourceLocation InitLoc,
11981                                        FieldDecl *BitField,
11982                                        Expr *Init) {
11983   (void) AnalyzeBitFieldAssignment(*this, BitField, Init, InitLoc);
11984 }
11985 
11986 static void diagnoseArrayStarInParamType(Sema &S, QualType PType,
11987                                          SourceLocation Loc) {
11988   if (!PType->isVariablyModifiedType())
11989     return;
11990   if (const auto *PointerTy = dyn_cast<PointerType>(PType)) {
11991     diagnoseArrayStarInParamType(S, PointerTy->getPointeeType(), Loc);
11992     return;
11993   }
11994   if (const auto *ReferenceTy = dyn_cast<ReferenceType>(PType)) {
11995     diagnoseArrayStarInParamType(S, ReferenceTy->getPointeeType(), Loc);
11996     return;
11997   }
11998   if (const auto *ParenTy = dyn_cast<ParenType>(PType)) {
11999     diagnoseArrayStarInParamType(S, ParenTy->getInnerType(), Loc);
12000     return;
12001   }
12002 
12003   const ArrayType *AT = S.Context.getAsArrayType(PType);
12004   if (!AT)
12005     return;
12006 
12007   if (AT->getSizeModifier() != ArrayType::Star) {
12008     diagnoseArrayStarInParamType(S, AT->getElementType(), Loc);
12009     return;
12010   }
12011 
12012   S.Diag(Loc, diag::err_array_star_in_function_definition);
12013 }
12014 
12015 /// CheckParmsForFunctionDef - Check that the parameters of the given
12016 /// function are appropriate for the definition of a function. This
12017 /// takes care of any checks that cannot be performed on the
12018 /// declaration itself, e.g., that the types of each of the function
12019 /// parameters are complete.
12020 bool Sema::CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
12021                                     bool CheckParameterNames) {
12022   bool HasInvalidParm = false;
12023   for (ParmVarDecl *Param : Parameters) {
12024     // C99 6.7.5.3p4: the parameters in a parameter type list in a
12025     // function declarator that is part of a function definition of
12026     // that function shall not have incomplete type.
12027     //
12028     // This is also C++ [dcl.fct]p6.
12029     if (!Param->isInvalidDecl() &&
12030         RequireCompleteType(Param->getLocation(), Param->getType(),
12031                             diag::err_typecheck_decl_incomplete_type)) {
12032       Param->setInvalidDecl();
12033       HasInvalidParm = true;
12034     }
12035 
12036     // C99 6.9.1p5: If the declarator includes a parameter type list, the
12037     // declaration of each parameter shall include an identifier.
12038     if (CheckParameterNames &&
12039         Param->getIdentifier() == nullptr &&
12040         !Param->isImplicit() &&
12041         !getLangOpts().CPlusPlus)
12042       Diag(Param->getLocation(), diag::err_parameter_name_omitted);
12043 
12044     // C99 6.7.5.3p12:
12045     //   If the function declarator is not part of a definition of that
12046     //   function, parameters may have incomplete type and may use the [*]
12047     //   notation in their sequences of declarator specifiers to specify
12048     //   variable length array types.
12049     QualType PType = Param->getOriginalType();
12050     // FIXME: This diagnostic should point the '[*]' if source-location
12051     // information is added for it.
12052     diagnoseArrayStarInParamType(*this, PType, Param->getLocation());
12053 
12054     // If the parameter is a c++ class type and it has to be destructed in the
12055     // callee function, declare the destructor so that it can be called by the
12056     // callee function. Do not perform any direct access check on the dtor here.
12057     if (!Param->isInvalidDecl()) {
12058       if (CXXRecordDecl *ClassDecl = Param->getType()->getAsCXXRecordDecl()) {
12059         if (!ClassDecl->isInvalidDecl() &&
12060             !ClassDecl->hasIrrelevantDestructor() &&
12061             !ClassDecl->isDependentContext() &&
12062             ClassDecl->isParamDestroyedInCallee()) {
12063           CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
12064           MarkFunctionReferenced(Param->getLocation(), Destructor);
12065           DiagnoseUseOfDecl(Destructor, Param->getLocation());
12066         }
12067       }
12068     }
12069 
12070     // Parameters with the pass_object_size attribute only need to be marked
12071     // constant at function definitions. Because we lack information about
12072     // whether we're on a declaration or definition when we're instantiating the
12073     // attribute, we need to check for constness here.
12074     if (const auto *Attr = Param->getAttr<PassObjectSizeAttr>())
12075       if (!Param->getType().isConstQualified())
12076         Diag(Param->getLocation(), diag::err_attribute_pointers_only)
12077             << Attr->getSpelling() << 1;
12078   }
12079 
12080   return HasInvalidParm;
12081 }
12082 
12083 /// A helper function to get the alignment of a Decl referred to by DeclRefExpr
12084 /// or MemberExpr.
12085 static CharUnits getDeclAlign(Expr *E, CharUnits TypeAlign,
12086                               ASTContext &Context) {
12087   if (const auto *DRE = dyn_cast<DeclRefExpr>(E))
12088     return Context.getDeclAlign(DRE->getDecl());
12089 
12090   if (const auto *ME = dyn_cast<MemberExpr>(E))
12091     return Context.getDeclAlign(ME->getMemberDecl());
12092 
12093   return TypeAlign;
12094 }
12095 
12096 /// CheckCastAlign - Implements -Wcast-align, which warns when a
12097 /// pointer cast increases the alignment requirements.
12098 void Sema::CheckCastAlign(Expr *Op, QualType T, SourceRange TRange) {
12099   // This is actually a lot of work to potentially be doing on every
12100   // cast; don't do it if we're ignoring -Wcast_align (as is the default).
12101   if (getDiagnostics().isIgnored(diag::warn_cast_align, TRange.getBegin()))
12102     return;
12103 
12104   // Ignore dependent types.
12105   if (T->isDependentType() || Op->getType()->isDependentType())
12106     return;
12107 
12108   // Require that the destination be a pointer type.
12109   const PointerType *DestPtr = T->getAs<PointerType>();
12110   if (!DestPtr) return;
12111 
12112   // If the destination has alignment 1, we're done.
12113   QualType DestPointee = DestPtr->getPointeeType();
12114   if (DestPointee->isIncompleteType()) return;
12115   CharUnits DestAlign = Context.getTypeAlignInChars(DestPointee);
12116   if (DestAlign.isOne()) return;
12117 
12118   // Require that the source be a pointer type.
12119   const PointerType *SrcPtr = Op->getType()->getAs<PointerType>();
12120   if (!SrcPtr) return;
12121   QualType SrcPointee = SrcPtr->getPointeeType();
12122 
12123   // Whitelist casts from cv void*.  We already implicitly
12124   // whitelisted casts to cv void*, since they have alignment 1.
12125   // Also whitelist casts involving incomplete types, which implicitly
12126   // includes 'void'.
12127   if (SrcPointee->isIncompleteType()) return;
12128 
12129   CharUnits SrcAlign = Context.getTypeAlignInChars(SrcPointee);
12130 
12131   if (auto *CE = dyn_cast<CastExpr>(Op)) {
12132     if (CE->getCastKind() == CK_ArrayToPointerDecay)
12133       SrcAlign = getDeclAlign(CE->getSubExpr(), SrcAlign, Context);
12134   } else if (auto *UO = dyn_cast<UnaryOperator>(Op)) {
12135     if (UO->getOpcode() == UO_AddrOf)
12136       SrcAlign = getDeclAlign(UO->getSubExpr(), SrcAlign, Context);
12137   }
12138 
12139   if (SrcAlign >= DestAlign) return;
12140 
12141   Diag(TRange.getBegin(), diag::warn_cast_align)
12142     << Op->getType() << T
12143     << static_cast<unsigned>(SrcAlign.getQuantity())
12144     << static_cast<unsigned>(DestAlign.getQuantity())
12145     << TRange << Op->getSourceRange();
12146 }
12147 
12148 /// Check whether this array fits the idiom of a size-one tail padded
12149 /// array member of a struct.
12150 ///
12151 /// We avoid emitting out-of-bounds access warnings for such arrays as they are
12152 /// commonly used to emulate flexible arrays in C89 code.
12153 static bool IsTailPaddedMemberArray(Sema &S, const llvm::APInt &Size,
12154                                     const NamedDecl *ND) {
12155   if (Size != 1 || !ND) return false;
12156 
12157   const FieldDecl *FD = dyn_cast<FieldDecl>(ND);
12158   if (!FD) return false;
12159 
12160   // Don't consider sizes resulting from macro expansions or template argument
12161   // substitution to form C89 tail-padded arrays.
12162 
12163   TypeSourceInfo *TInfo = FD->getTypeSourceInfo();
12164   while (TInfo) {
12165     TypeLoc TL = TInfo->getTypeLoc();
12166     // Look through typedefs.
12167     if (TypedefTypeLoc TTL = TL.getAs<TypedefTypeLoc>()) {
12168       const TypedefNameDecl *TDL = TTL.getTypedefNameDecl();
12169       TInfo = TDL->getTypeSourceInfo();
12170       continue;
12171     }
12172     if (ConstantArrayTypeLoc CTL = TL.getAs<ConstantArrayTypeLoc>()) {
12173       const Expr *SizeExpr = dyn_cast<IntegerLiteral>(CTL.getSizeExpr());
12174       if (!SizeExpr || SizeExpr->getExprLoc().isMacroID())
12175         return false;
12176     }
12177     break;
12178   }
12179 
12180   const RecordDecl *RD = dyn_cast<RecordDecl>(FD->getDeclContext());
12181   if (!RD) return false;
12182   if (RD->isUnion()) return false;
12183   if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
12184     if (!CRD->isStandardLayout()) return false;
12185   }
12186 
12187   // See if this is the last field decl in the record.
12188   const Decl *D = FD;
12189   while ((D = D->getNextDeclInContext()))
12190     if (isa<FieldDecl>(D))
12191       return false;
12192   return true;
12193 }
12194 
12195 void Sema::CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
12196                             const ArraySubscriptExpr *ASE,
12197                             bool AllowOnePastEnd, bool IndexNegated) {
12198   IndexExpr = IndexExpr->IgnoreParenImpCasts();
12199   if (IndexExpr->isValueDependent())
12200     return;
12201 
12202   const Type *EffectiveType =
12203       BaseExpr->getType()->getPointeeOrArrayElementType();
12204   BaseExpr = BaseExpr->IgnoreParenCasts();
12205   const ConstantArrayType *ArrayTy =
12206     Context.getAsConstantArrayType(BaseExpr->getType());
12207   if (!ArrayTy)
12208     return;
12209 
12210   llvm::APSInt index;
12211   if (!IndexExpr->EvaluateAsInt(index, Context, Expr::SE_AllowSideEffects))
12212     return;
12213   if (IndexNegated)
12214     index = -index;
12215 
12216   const NamedDecl *ND = nullptr;
12217   if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
12218     ND = DRE->getDecl();
12219   if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
12220     ND = ME->getMemberDecl();
12221 
12222   if (index.isUnsigned() || !index.isNegative()) {
12223     llvm::APInt size = ArrayTy->getSize();
12224     if (!size.isStrictlyPositive())
12225       return;
12226 
12227     const Type *BaseType = BaseExpr->getType()->getPointeeOrArrayElementType();
12228     if (BaseType != EffectiveType) {
12229       // Make sure we're comparing apples to apples when comparing index to size
12230       uint64_t ptrarith_typesize = Context.getTypeSize(EffectiveType);
12231       uint64_t array_typesize = Context.getTypeSize(BaseType);
12232       // Handle ptrarith_typesize being zero, such as when casting to void*
12233       if (!ptrarith_typesize) ptrarith_typesize = 1;
12234       if (ptrarith_typesize != array_typesize) {
12235         // There's a cast to a different size type involved
12236         uint64_t ratio = array_typesize / ptrarith_typesize;
12237         // TODO: Be smarter about handling cases where array_typesize is not a
12238         // multiple of ptrarith_typesize
12239         if (ptrarith_typesize * ratio == array_typesize)
12240           size *= llvm::APInt(size.getBitWidth(), ratio);
12241       }
12242     }
12243 
12244     if (size.getBitWidth() > index.getBitWidth())
12245       index = index.zext(size.getBitWidth());
12246     else if (size.getBitWidth() < index.getBitWidth())
12247       size = size.zext(index.getBitWidth());
12248 
12249     // For array subscripting the index must be less than size, but for pointer
12250     // arithmetic also allow the index (offset) to be equal to size since
12251     // computing the next address after the end of the array is legal and
12252     // commonly done e.g. in C++ iterators and range-based for loops.
12253     if (AllowOnePastEnd ? index.ule(size) : index.ult(size))
12254       return;
12255 
12256     // Also don't warn for arrays of size 1 which are members of some
12257     // structure. These are often used to approximate flexible arrays in C89
12258     // code.
12259     if (IsTailPaddedMemberArray(*this, size, ND))
12260       return;
12261 
12262     // Suppress the warning if the subscript expression (as identified by the
12263     // ']' location) and the index expression are both from macro expansions
12264     // within a system header.
12265     if (ASE) {
12266       SourceLocation RBracketLoc = SourceMgr.getSpellingLoc(
12267           ASE->getRBracketLoc());
12268       if (SourceMgr.isInSystemHeader(RBracketLoc)) {
12269         SourceLocation IndexLoc =
12270             SourceMgr.getSpellingLoc(IndexExpr->getBeginLoc());
12271         if (SourceMgr.isWrittenInSameFile(RBracketLoc, IndexLoc))
12272           return;
12273       }
12274     }
12275 
12276     unsigned DiagID = diag::warn_ptr_arith_exceeds_bounds;
12277     if (ASE)
12278       DiagID = diag::warn_array_index_exceeds_bounds;
12279 
12280     DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
12281                         PDiag(DiagID) << index.toString(10, true)
12282                                       << size.toString(10, true)
12283                                       << (unsigned)size.getLimitedValue(~0U)
12284                                       << IndexExpr->getSourceRange());
12285   } else {
12286     unsigned DiagID = diag::warn_array_index_precedes_bounds;
12287     if (!ASE) {
12288       DiagID = diag::warn_ptr_arith_precedes_bounds;
12289       if (index.isNegative()) index = -index;
12290     }
12291 
12292     DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
12293                         PDiag(DiagID) << index.toString(10, true)
12294                                       << IndexExpr->getSourceRange());
12295   }
12296 
12297   if (!ND) {
12298     // Try harder to find a NamedDecl to point at in the note.
12299     while (const ArraySubscriptExpr *ASE =
12300            dyn_cast<ArraySubscriptExpr>(BaseExpr))
12301       BaseExpr = ASE->getBase()->IgnoreParenCasts();
12302     if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
12303       ND = DRE->getDecl();
12304     if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
12305       ND = ME->getMemberDecl();
12306   }
12307 
12308   if (ND)
12309     DiagRuntimeBehavior(ND->getBeginLoc(), BaseExpr,
12310                         PDiag(diag::note_array_index_out_of_bounds)
12311                             << ND->getDeclName());
12312 }
12313 
12314 void Sema::CheckArrayAccess(const Expr *expr) {
12315   int AllowOnePastEnd = 0;
12316   while (expr) {
12317     expr = expr->IgnoreParenImpCasts();
12318     switch (expr->getStmtClass()) {
12319       case Stmt::ArraySubscriptExprClass: {
12320         const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(expr);
12321         CheckArrayAccess(ASE->getBase(), ASE->getIdx(), ASE,
12322                          AllowOnePastEnd > 0);
12323         expr = ASE->getBase();
12324         break;
12325       }
12326       case Stmt::MemberExprClass: {
12327         expr = cast<MemberExpr>(expr)->getBase();
12328         break;
12329       }
12330       case Stmt::OMPArraySectionExprClass: {
12331         const OMPArraySectionExpr *ASE = cast<OMPArraySectionExpr>(expr);
12332         if (ASE->getLowerBound())
12333           CheckArrayAccess(ASE->getBase(), ASE->getLowerBound(),
12334                            /*ASE=*/nullptr, AllowOnePastEnd > 0);
12335         return;
12336       }
12337       case Stmt::UnaryOperatorClass: {
12338         // Only unwrap the * and & unary operators
12339         const UnaryOperator *UO = cast<UnaryOperator>(expr);
12340         expr = UO->getSubExpr();
12341         switch (UO->getOpcode()) {
12342           case UO_AddrOf:
12343             AllowOnePastEnd++;
12344             break;
12345           case UO_Deref:
12346             AllowOnePastEnd--;
12347             break;
12348           default:
12349             return;
12350         }
12351         break;
12352       }
12353       case Stmt::ConditionalOperatorClass: {
12354         const ConditionalOperator *cond = cast<ConditionalOperator>(expr);
12355         if (const Expr *lhs = cond->getLHS())
12356           CheckArrayAccess(lhs);
12357         if (const Expr *rhs = cond->getRHS())
12358           CheckArrayAccess(rhs);
12359         return;
12360       }
12361       case Stmt::CXXOperatorCallExprClass: {
12362         const auto *OCE = cast<CXXOperatorCallExpr>(expr);
12363         for (const auto *Arg : OCE->arguments())
12364           CheckArrayAccess(Arg);
12365         return;
12366       }
12367       default:
12368         return;
12369     }
12370   }
12371 }
12372 
12373 //===--- CHECK: Objective-C retain cycles ----------------------------------//
12374 
12375 namespace {
12376 
12377 struct RetainCycleOwner {
12378   VarDecl *Variable = nullptr;
12379   SourceRange Range;
12380   SourceLocation Loc;
12381   bool Indirect = false;
12382 
12383   RetainCycleOwner() = default;
12384 
12385   void setLocsFrom(Expr *e) {
12386     Loc = e->getExprLoc();
12387     Range = e->getSourceRange();
12388   }
12389 };
12390 
12391 } // namespace
12392 
12393 /// Consider whether capturing the given variable can possibly lead to
12394 /// a retain cycle.
12395 static bool considerVariable(VarDecl *var, Expr *ref, RetainCycleOwner &owner) {
12396   // In ARC, it's captured strongly iff the variable has __strong
12397   // lifetime.  In MRR, it's captured strongly if the variable is
12398   // __block and has an appropriate type.
12399   if (var->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
12400     return false;
12401 
12402   owner.Variable = var;
12403   if (ref)
12404     owner.setLocsFrom(ref);
12405   return true;
12406 }
12407 
12408 static bool findRetainCycleOwner(Sema &S, Expr *e, RetainCycleOwner &owner) {
12409   while (true) {
12410     e = e->IgnoreParens();
12411     if (CastExpr *cast = dyn_cast<CastExpr>(e)) {
12412       switch (cast->getCastKind()) {
12413       case CK_BitCast:
12414       case CK_LValueBitCast:
12415       case CK_LValueToRValue:
12416       case CK_ARCReclaimReturnedObject:
12417         e = cast->getSubExpr();
12418         continue;
12419 
12420       default:
12421         return false;
12422       }
12423     }
12424 
12425     if (ObjCIvarRefExpr *ref = dyn_cast<ObjCIvarRefExpr>(e)) {
12426       ObjCIvarDecl *ivar = ref->getDecl();
12427       if (ivar->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
12428         return false;
12429 
12430       // Try to find a retain cycle in the base.
12431       if (!findRetainCycleOwner(S, ref->getBase(), owner))
12432         return false;
12433 
12434       if (ref->isFreeIvar()) owner.setLocsFrom(ref);
12435       owner.Indirect = true;
12436       return true;
12437     }
12438 
12439     if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
12440       VarDecl *var = dyn_cast<VarDecl>(ref->getDecl());
12441       if (!var) return false;
12442       return considerVariable(var, ref, owner);
12443     }
12444 
12445     if (MemberExpr *member = dyn_cast<MemberExpr>(e)) {
12446       if (member->isArrow()) return false;
12447 
12448       // Don't count this as an indirect ownership.
12449       e = member->getBase();
12450       continue;
12451     }
12452 
12453     if (PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) {
12454       // Only pay attention to pseudo-objects on property references.
12455       ObjCPropertyRefExpr *pre
12456         = dyn_cast<ObjCPropertyRefExpr>(pseudo->getSyntacticForm()
12457                                               ->IgnoreParens());
12458       if (!pre) return false;
12459       if (pre->isImplicitProperty()) return false;
12460       ObjCPropertyDecl *property = pre->getExplicitProperty();
12461       if (!property->isRetaining() &&
12462           !(property->getPropertyIvarDecl() &&
12463             property->getPropertyIvarDecl()->getType()
12464               .getObjCLifetime() == Qualifiers::OCL_Strong))
12465           return false;
12466 
12467       owner.Indirect = true;
12468       if (pre->isSuperReceiver()) {
12469         owner.Variable = S.getCurMethodDecl()->getSelfDecl();
12470         if (!owner.Variable)
12471           return false;
12472         owner.Loc = pre->getLocation();
12473         owner.Range = pre->getSourceRange();
12474         return true;
12475       }
12476       e = const_cast<Expr*>(cast<OpaqueValueExpr>(pre->getBase())
12477                               ->getSourceExpr());
12478       continue;
12479     }
12480 
12481     // Array ivars?
12482 
12483     return false;
12484   }
12485 }
12486 
12487 namespace {
12488 
12489   struct FindCaptureVisitor : EvaluatedExprVisitor<FindCaptureVisitor> {
12490     ASTContext &Context;
12491     VarDecl *Variable;
12492     Expr *Capturer = nullptr;
12493     bool VarWillBeReased = false;
12494 
12495     FindCaptureVisitor(ASTContext &Context, VarDecl *variable)
12496         : EvaluatedExprVisitor<FindCaptureVisitor>(Context),
12497           Context(Context), Variable(variable) {}
12498 
12499     void VisitDeclRefExpr(DeclRefExpr *ref) {
12500       if (ref->getDecl() == Variable && !Capturer)
12501         Capturer = ref;
12502     }
12503 
12504     void VisitObjCIvarRefExpr(ObjCIvarRefExpr *ref) {
12505       if (Capturer) return;
12506       Visit(ref->getBase());
12507       if (Capturer && ref->isFreeIvar())
12508         Capturer = ref;
12509     }
12510 
12511     void VisitBlockExpr(BlockExpr *block) {
12512       // Look inside nested blocks
12513       if (block->getBlockDecl()->capturesVariable(Variable))
12514         Visit(block->getBlockDecl()->getBody());
12515     }
12516 
12517     void VisitOpaqueValueExpr(OpaqueValueExpr *OVE) {
12518       if (Capturer) return;
12519       if (OVE->getSourceExpr())
12520         Visit(OVE->getSourceExpr());
12521     }
12522 
12523     void VisitBinaryOperator(BinaryOperator *BinOp) {
12524       if (!Variable || VarWillBeReased || BinOp->getOpcode() != BO_Assign)
12525         return;
12526       Expr *LHS = BinOp->getLHS();
12527       if (const DeclRefExpr *DRE = dyn_cast_or_null<DeclRefExpr>(LHS)) {
12528         if (DRE->getDecl() != Variable)
12529           return;
12530         if (Expr *RHS = BinOp->getRHS()) {
12531           RHS = RHS->IgnoreParenCasts();
12532           llvm::APSInt Value;
12533           VarWillBeReased =
12534             (RHS && RHS->isIntegerConstantExpr(Value, Context) && Value == 0);
12535         }
12536       }
12537     }
12538   };
12539 
12540 } // namespace
12541 
12542 /// Check whether the given argument is a block which captures a
12543 /// variable.
12544 static Expr *findCapturingExpr(Sema &S, Expr *e, RetainCycleOwner &owner) {
12545   assert(owner.Variable && owner.Loc.isValid());
12546 
12547   e = e->IgnoreParenCasts();
12548 
12549   // Look through [^{...} copy] and Block_copy(^{...}).
12550   if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(e)) {
12551     Selector Cmd = ME->getSelector();
12552     if (Cmd.isUnarySelector() && Cmd.getNameForSlot(0) == "copy") {
12553       e = ME->getInstanceReceiver();
12554       if (!e)
12555         return nullptr;
12556       e = e->IgnoreParenCasts();
12557     }
12558   } else if (CallExpr *CE = dyn_cast<CallExpr>(e)) {
12559     if (CE->getNumArgs() == 1) {
12560       FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(CE->getCalleeDecl());
12561       if (Fn) {
12562         const IdentifierInfo *FnI = Fn->getIdentifier();
12563         if (FnI && FnI->isStr("_Block_copy")) {
12564           e = CE->getArg(0)->IgnoreParenCasts();
12565         }
12566       }
12567     }
12568   }
12569 
12570   BlockExpr *block = dyn_cast<BlockExpr>(e);
12571   if (!block || !block->getBlockDecl()->capturesVariable(owner.Variable))
12572     return nullptr;
12573 
12574   FindCaptureVisitor visitor(S.Context, owner.Variable);
12575   visitor.Visit(block->getBlockDecl()->getBody());
12576   return visitor.VarWillBeReased ? nullptr : visitor.Capturer;
12577 }
12578 
12579 static void diagnoseRetainCycle(Sema &S, Expr *capturer,
12580                                 RetainCycleOwner &owner) {
12581   assert(capturer);
12582   assert(owner.Variable && owner.Loc.isValid());
12583 
12584   S.Diag(capturer->getExprLoc(), diag::warn_arc_retain_cycle)
12585     << owner.Variable << capturer->getSourceRange();
12586   S.Diag(owner.Loc, diag::note_arc_retain_cycle_owner)
12587     << owner.Indirect << owner.Range;
12588 }
12589 
12590 /// Check for a keyword selector that starts with the word 'add' or
12591 /// 'set'.
12592 static bool isSetterLikeSelector(Selector sel) {
12593   if (sel.isUnarySelector()) return false;
12594 
12595   StringRef str = sel.getNameForSlot(0);
12596   while (!str.empty() && str.front() == '_') str = str.substr(1);
12597   if (str.startswith("set"))
12598     str = str.substr(3);
12599   else if (str.startswith("add")) {
12600     // Specially whitelist 'addOperationWithBlock:'.
12601     if (sel.getNumArgs() == 1 && str.startswith("addOperationWithBlock"))
12602       return false;
12603     str = str.substr(3);
12604   }
12605   else
12606     return false;
12607 
12608   if (str.empty()) return true;
12609   return !isLowercase(str.front());
12610 }
12611 
12612 static Optional<int> GetNSMutableArrayArgumentIndex(Sema &S,
12613                                                     ObjCMessageExpr *Message) {
12614   bool IsMutableArray = S.NSAPIObj->isSubclassOfNSClass(
12615                                                 Message->getReceiverInterface(),
12616                                                 NSAPI::ClassId_NSMutableArray);
12617   if (!IsMutableArray) {
12618     return None;
12619   }
12620 
12621   Selector Sel = Message->getSelector();
12622 
12623   Optional<NSAPI::NSArrayMethodKind> MKOpt =
12624     S.NSAPIObj->getNSArrayMethodKind(Sel);
12625   if (!MKOpt) {
12626     return None;
12627   }
12628 
12629   NSAPI::NSArrayMethodKind MK = *MKOpt;
12630 
12631   switch (MK) {
12632     case NSAPI::NSMutableArr_addObject:
12633     case NSAPI::NSMutableArr_insertObjectAtIndex:
12634     case NSAPI::NSMutableArr_setObjectAtIndexedSubscript:
12635       return 0;
12636     case NSAPI::NSMutableArr_replaceObjectAtIndex:
12637       return 1;
12638 
12639     default:
12640       return None;
12641   }
12642 
12643   return None;
12644 }
12645 
12646 static
12647 Optional<int> GetNSMutableDictionaryArgumentIndex(Sema &S,
12648                                                   ObjCMessageExpr *Message) {
12649   bool IsMutableDictionary = S.NSAPIObj->isSubclassOfNSClass(
12650                                             Message->getReceiverInterface(),
12651                                             NSAPI::ClassId_NSMutableDictionary);
12652   if (!IsMutableDictionary) {
12653     return None;
12654   }
12655 
12656   Selector Sel = Message->getSelector();
12657 
12658   Optional<NSAPI::NSDictionaryMethodKind> MKOpt =
12659     S.NSAPIObj->getNSDictionaryMethodKind(Sel);
12660   if (!MKOpt) {
12661     return None;
12662   }
12663 
12664   NSAPI::NSDictionaryMethodKind MK = *MKOpt;
12665 
12666   switch (MK) {
12667     case NSAPI::NSMutableDict_setObjectForKey:
12668     case NSAPI::NSMutableDict_setValueForKey:
12669     case NSAPI::NSMutableDict_setObjectForKeyedSubscript:
12670       return 0;
12671 
12672     default:
12673       return None;
12674   }
12675 
12676   return None;
12677 }
12678 
12679 static Optional<int> GetNSSetArgumentIndex(Sema &S, ObjCMessageExpr *Message) {
12680   bool IsMutableSet = S.NSAPIObj->isSubclassOfNSClass(
12681                                                 Message->getReceiverInterface(),
12682                                                 NSAPI::ClassId_NSMutableSet);
12683 
12684   bool IsMutableOrderedSet = S.NSAPIObj->isSubclassOfNSClass(
12685                                             Message->getReceiverInterface(),
12686                                             NSAPI::ClassId_NSMutableOrderedSet);
12687   if (!IsMutableSet && !IsMutableOrderedSet) {
12688     return None;
12689   }
12690 
12691   Selector Sel = Message->getSelector();
12692 
12693   Optional<NSAPI::NSSetMethodKind> MKOpt = S.NSAPIObj->getNSSetMethodKind(Sel);
12694   if (!MKOpt) {
12695     return None;
12696   }
12697 
12698   NSAPI::NSSetMethodKind MK = *MKOpt;
12699 
12700   switch (MK) {
12701     case NSAPI::NSMutableSet_addObject:
12702     case NSAPI::NSOrderedSet_setObjectAtIndex:
12703     case NSAPI::NSOrderedSet_setObjectAtIndexedSubscript:
12704     case NSAPI::NSOrderedSet_insertObjectAtIndex:
12705       return 0;
12706     case NSAPI::NSOrderedSet_replaceObjectAtIndexWithObject:
12707       return 1;
12708   }
12709 
12710   return None;
12711 }
12712 
12713 void Sema::CheckObjCCircularContainer(ObjCMessageExpr *Message) {
12714   if (!Message->isInstanceMessage()) {
12715     return;
12716   }
12717 
12718   Optional<int> ArgOpt;
12719 
12720   if (!(ArgOpt = GetNSMutableArrayArgumentIndex(*this, Message)) &&
12721       !(ArgOpt = GetNSMutableDictionaryArgumentIndex(*this, Message)) &&
12722       !(ArgOpt = GetNSSetArgumentIndex(*this, Message))) {
12723     return;
12724   }
12725 
12726   int ArgIndex = *ArgOpt;
12727 
12728   Expr *Arg = Message->getArg(ArgIndex)->IgnoreImpCasts();
12729   if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Arg)) {
12730     Arg = OE->getSourceExpr()->IgnoreImpCasts();
12731   }
12732 
12733   if (Message->getReceiverKind() == ObjCMessageExpr::SuperInstance) {
12734     if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
12735       if (ArgRE->isObjCSelfExpr()) {
12736         Diag(Message->getSourceRange().getBegin(),
12737              diag::warn_objc_circular_container)
12738           << ArgRE->getDecl() << StringRef("'super'");
12739       }
12740     }
12741   } else {
12742     Expr *Receiver = Message->getInstanceReceiver()->IgnoreImpCasts();
12743 
12744     if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Receiver)) {
12745       Receiver = OE->getSourceExpr()->IgnoreImpCasts();
12746     }
12747 
12748     if (DeclRefExpr *ReceiverRE = dyn_cast<DeclRefExpr>(Receiver)) {
12749       if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
12750         if (ReceiverRE->getDecl() == ArgRE->getDecl()) {
12751           ValueDecl *Decl = ReceiverRE->getDecl();
12752           Diag(Message->getSourceRange().getBegin(),
12753                diag::warn_objc_circular_container)
12754             << Decl << Decl;
12755           if (!ArgRE->isObjCSelfExpr()) {
12756             Diag(Decl->getLocation(),
12757                  diag::note_objc_circular_container_declared_here)
12758               << Decl;
12759           }
12760         }
12761       }
12762     } else if (ObjCIvarRefExpr *IvarRE = dyn_cast<ObjCIvarRefExpr>(Receiver)) {
12763       if (ObjCIvarRefExpr *IvarArgRE = dyn_cast<ObjCIvarRefExpr>(Arg)) {
12764         if (IvarRE->getDecl() == IvarArgRE->getDecl()) {
12765           ObjCIvarDecl *Decl = IvarRE->getDecl();
12766           Diag(Message->getSourceRange().getBegin(),
12767                diag::warn_objc_circular_container)
12768             << Decl << Decl;
12769           Diag(Decl->getLocation(),
12770                diag::note_objc_circular_container_declared_here)
12771             << Decl;
12772         }
12773       }
12774     }
12775   }
12776 }
12777 
12778 /// Check a message send to see if it's likely to cause a retain cycle.
12779 void Sema::checkRetainCycles(ObjCMessageExpr *msg) {
12780   // Only check instance methods whose selector looks like a setter.
12781   if (!msg->isInstanceMessage() || !isSetterLikeSelector(msg->getSelector()))
12782     return;
12783 
12784   // Try to find a variable that the receiver is strongly owned by.
12785   RetainCycleOwner owner;
12786   if (msg->getReceiverKind() == ObjCMessageExpr::Instance) {
12787     if (!findRetainCycleOwner(*this, msg->getInstanceReceiver(), owner))
12788       return;
12789   } else {
12790     assert(msg->getReceiverKind() == ObjCMessageExpr::SuperInstance);
12791     owner.Variable = getCurMethodDecl()->getSelfDecl();
12792     owner.Loc = msg->getSuperLoc();
12793     owner.Range = msg->getSuperLoc();
12794   }
12795 
12796   // Check whether the receiver is captured by any of the arguments.
12797   const ObjCMethodDecl *MD = msg->getMethodDecl();
12798   for (unsigned i = 0, e = msg->getNumArgs(); i != e; ++i) {
12799     if (Expr *capturer = findCapturingExpr(*this, msg->getArg(i), owner)) {
12800       // noescape blocks should not be retained by the method.
12801       if (MD && MD->parameters()[i]->hasAttr<NoEscapeAttr>())
12802         continue;
12803       return diagnoseRetainCycle(*this, capturer, owner);
12804     }
12805   }
12806 }
12807 
12808 /// Check a property assign to see if it's likely to cause a retain cycle.
12809 void Sema::checkRetainCycles(Expr *receiver, Expr *argument) {
12810   RetainCycleOwner owner;
12811   if (!findRetainCycleOwner(*this, receiver, owner))
12812     return;
12813 
12814   if (Expr *capturer = findCapturingExpr(*this, argument, owner))
12815     diagnoseRetainCycle(*this, capturer, owner);
12816 }
12817 
12818 void Sema::checkRetainCycles(VarDecl *Var, Expr *Init) {
12819   RetainCycleOwner Owner;
12820   if (!considerVariable(Var, /*DeclRefExpr=*/nullptr, Owner))
12821     return;
12822 
12823   // Because we don't have an expression for the variable, we have to set the
12824   // location explicitly here.
12825   Owner.Loc = Var->getLocation();
12826   Owner.Range = Var->getSourceRange();
12827 
12828   if (Expr *Capturer = findCapturingExpr(*this, Init, Owner))
12829     diagnoseRetainCycle(*this, Capturer, Owner);
12830 }
12831 
12832 static bool checkUnsafeAssignLiteral(Sema &S, SourceLocation Loc,
12833                                      Expr *RHS, bool isProperty) {
12834   // Check if RHS is an Objective-C object literal, which also can get
12835   // immediately zapped in a weak reference.  Note that we explicitly
12836   // allow ObjCStringLiterals, since those are designed to never really die.
12837   RHS = RHS->IgnoreParenImpCasts();
12838 
12839   // This enum needs to match with the 'select' in
12840   // warn_objc_arc_literal_assign (off-by-1).
12841   Sema::ObjCLiteralKind Kind = S.CheckLiteralKind(RHS);
12842   if (Kind == Sema::LK_String || Kind == Sema::LK_None)
12843     return false;
12844 
12845   S.Diag(Loc, diag::warn_arc_literal_assign)
12846     << (unsigned) Kind
12847     << (isProperty ? 0 : 1)
12848     << RHS->getSourceRange();
12849 
12850   return true;
12851 }
12852 
12853 static bool checkUnsafeAssignObject(Sema &S, SourceLocation Loc,
12854                                     Qualifiers::ObjCLifetime LT,
12855                                     Expr *RHS, bool isProperty) {
12856   // Strip off any implicit cast added to get to the one ARC-specific.
12857   while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
12858     if (cast->getCastKind() == CK_ARCConsumeObject) {
12859       S.Diag(Loc, diag::warn_arc_retained_assign)
12860         << (LT == Qualifiers::OCL_ExplicitNone)
12861         << (isProperty ? 0 : 1)
12862         << RHS->getSourceRange();
12863       return true;
12864     }
12865     RHS = cast->getSubExpr();
12866   }
12867 
12868   if (LT == Qualifiers::OCL_Weak &&
12869       checkUnsafeAssignLiteral(S, Loc, RHS, isProperty))
12870     return true;
12871 
12872   return false;
12873 }
12874 
12875 bool Sema::checkUnsafeAssigns(SourceLocation Loc,
12876                               QualType LHS, Expr *RHS) {
12877   Qualifiers::ObjCLifetime LT = LHS.getObjCLifetime();
12878 
12879   if (LT != Qualifiers::OCL_Weak && LT != Qualifiers::OCL_ExplicitNone)
12880     return false;
12881 
12882   if (checkUnsafeAssignObject(*this, Loc, LT, RHS, false))
12883     return true;
12884 
12885   return false;
12886 }
12887 
12888 void Sema::checkUnsafeExprAssigns(SourceLocation Loc,
12889                               Expr *LHS, Expr *RHS) {
12890   QualType LHSType;
12891   // PropertyRef on LHS type need be directly obtained from
12892   // its declaration as it has a PseudoType.
12893   ObjCPropertyRefExpr *PRE
12894     = dyn_cast<ObjCPropertyRefExpr>(LHS->IgnoreParens());
12895   if (PRE && !PRE->isImplicitProperty()) {
12896     const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
12897     if (PD)
12898       LHSType = PD->getType();
12899   }
12900 
12901   if (LHSType.isNull())
12902     LHSType = LHS->getType();
12903 
12904   Qualifiers::ObjCLifetime LT = LHSType.getObjCLifetime();
12905 
12906   if (LT == Qualifiers::OCL_Weak) {
12907     if (!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc))
12908       getCurFunction()->markSafeWeakUse(LHS);
12909   }
12910 
12911   if (checkUnsafeAssigns(Loc, LHSType, RHS))
12912     return;
12913 
12914   // FIXME. Check for other life times.
12915   if (LT != Qualifiers::OCL_None)
12916     return;
12917 
12918   if (PRE) {
12919     if (PRE->isImplicitProperty())
12920       return;
12921     const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
12922     if (!PD)
12923       return;
12924 
12925     unsigned Attributes = PD->getPropertyAttributes();
12926     if (Attributes & ObjCPropertyDecl::OBJC_PR_assign) {
12927       // when 'assign' attribute was not explicitly specified
12928       // by user, ignore it and rely on property type itself
12929       // for lifetime info.
12930       unsigned AsWrittenAttr = PD->getPropertyAttributesAsWritten();
12931       if (!(AsWrittenAttr & ObjCPropertyDecl::OBJC_PR_assign) &&
12932           LHSType->isObjCRetainableType())
12933         return;
12934 
12935       while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
12936         if (cast->getCastKind() == CK_ARCConsumeObject) {
12937           Diag(Loc, diag::warn_arc_retained_property_assign)
12938           << RHS->getSourceRange();
12939           return;
12940         }
12941         RHS = cast->getSubExpr();
12942       }
12943     }
12944     else if (Attributes & ObjCPropertyDecl::OBJC_PR_weak) {
12945       if (checkUnsafeAssignObject(*this, Loc, Qualifiers::OCL_Weak, RHS, true))
12946         return;
12947     }
12948   }
12949 }
12950 
12951 //===--- CHECK: Empty statement body (-Wempty-body) ---------------------===//
12952 
12953 static bool ShouldDiagnoseEmptyStmtBody(const SourceManager &SourceMgr,
12954                                         SourceLocation StmtLoc,
12955                                         const NullStmt *Body) {
12956   // Do not warn if the body is a macro that expands to nothing, e.g:
12957   //
12958   // #define CALL(x)
12959   // if (condition)
12960   //   CALL(0);
12961   if (Body->hasLeadingEmptyMacro())
12962     return false;
12963 
12964   // Get line numbers of statement and body.
12965   bool StmtLineInvalid;
12966   unsigned StmtLine = SourceMgr.getPresumedLineNumber(StmtLoc,
12967                                                       &StmtLineInvalid);
12968   if (StmtLineInvalid)
12969     return false;
12970 
12971   bool BodyLineInvalid;
12972   unsigned BodyLine = SourceMgr.getSpellingLineNumber(Body->getSemiLoc(),
12973                                                       &BodyLineInvalid);
12974   if (BodyLineInvalid)
12975     return false;
12976 
12977   // Warn if null statement and body are on the same line.
12978   if (StmtLine != BodyLine)
12979     return false;
12980 
12981   return true;
12982 }
12983 
12984 void Sema::DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
12985                                  const Stmt *Body,
12986                                  unsigned DiagID) {
12987   // Since this is a syntactic check, don't emit diagnostic for template
12988   // instantiations, this just adds noise.
12989   if (CurrentInstantiationScope)
12990     return;
12991 
12992   // The body should be a null statement.
12993   const NullStmt *NBody = dyn_cast<NullStmt>(Body);
12994   if (!NBody)
12995     return;
12996 
12997   // Do the usual checks.
12998   if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
12999     return;
13000 
13001   Diag(NBody->getSemiLoc(), DiagID);
13002   Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
13003 }
13004 
13005 void Sema::DiagnoseEmptyLoopBody(const Stmt *S,
13006                                  const Stmt *PossibleBody) {
13007   assert(!CurrentInstantiationScope); // Ensured by caller
13008 
13009   SourceLocation StmtLoc;
13010   const Stmt *Body;
13011   unsigned DiagID;
13012   if (const ForStmt *FS = dyn_cast<ForStmt>(S)) {
13013     StmtLoc = FS->getRParenLoc();
13014     Body = FS->getBody();
13015     DiagID = diag::warn_empty_for_body;
13016   } else if (const WhileStmt *WS = dyn_cast<WhileStmt>(S)) {
13017     StmtLoc = WS->getCond()->getSourceRange().getEnd();
13018     Body = WS->getBody();
13019     DiagID = diag::warn_empty_while_body;
13020   } else
13021     return; // Neither `for' nor `while'.
13022 
13023   // The body should be a null statement.
13024   const NullStmt *NBody = dyn_cast<NullStmt>(Body);
13025   if (!NBody)
13026     return;
13027 
13028   // Skip expensive checks if diagnostic is disabled.
13029   if (Diags.isIgnored(DiagID, NBody->getSemiLoc()))
13030     return;
13031 
13032   // Do the usual checks.
13033   if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
13034     return;
13035 
13036   // `for(...);' and `while(...);' are popular idioms, so in order to keep
13037   // noise level low, emit diagnostics only if for/while is followed by a
13038   // CompoundStmt, e.g.:
13039   //    for (int i = 0; i < n; i++);
13040   //    {
13041   //      a(i);
13042   //    }
13043   // or if for/while is followed by a statement with more indentation
13044   // than for/while itself:
13045   //    for (int i = 0; i < n; i++);
13046   //      a(i);
13047   bool ProbableTypo = isa<CompoundStmt>(PossibleBody);
13048   if (!ProbableTypo) {
13049     bool BodyColInvalid;
13050     unsigned BodyCol = SourceMgr.getPresumedColumnNumber(
13051         PossibleBody->getBeginLoc(), &BodyColInvalid);
13052     if (BodyColInvalid)
13053       return;
13054 
13055     bool StmtColInvalid;
13056     unsigned StmtCol =
13057         SourceMgr.getPresumedColumnNumber(S->getBeginLoc(), &StmtColInvalid);
13058     if (StmtColInvalid)
13059       return;
13060 
13061     if (BodyCol > StmtCol)
13062       ProbableTypo = true;
13063   }
13064 
13065   if (ProbableTypo) {
13066     Diag(NBody->getSemiLoc(), DiagID);
13067     Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
13068   }
13069 }
13070 
13071 //===--- CHECK: Warn on self move with std::move. -------------------------===//
13072 
13073 /// DiagnoseSelfMove - Emits a warning if a value is moved to itself.
13074 void Sema::DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
13075                              SourceLocation OpLoc) {
13076   if (Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess, OpLoc))
13077     return;
13078 
13079   if (inTemplateInstantiation())
13080     return;
13081 
13082   // Strip parens and casts away.
13083   LHSExpr = LHSExpr->IgnoreParenImpCasts();
13084   RHSExpr = RHSExpr->IgnoreParenImpCasts();
13085 
13086   // Check for a call expression
13087   const CallExpr *CE = dyn_cast<CallExpr>(RHSExpr);
13088   if (!CE || CE->getNumArgs() != 1)
13089     return;
13090 
13091   // Check for a call to std::move
13092   if (!CE->isCallToStdMove())
13093     return;
13094 
13095   // Get argument from std::move
13096   RHSExpr = CE->getArg(0);
13097 
13098   const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
13099   const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
13100 
13101   // Two DeclRefExpr's, check that the decls are the same.
13102   if (LHSDeclRef && RHSDeclRef) {
13103     if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
13104       return;
13105     if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
13106         RHSDeclRef->getDecl()->getCanonicalDecl())
13107       return;
13108 
13109     Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
13110                                         << LHSExpr->getSourceRange()
13111                                         << RHSExpr->getSourceRange();
13112     return;
13113   }
13114 
13115   // Member variables require a different approach to check for self moves.
13116   // MemberExpr's are the same if every nested MemberExpr refers to the same
13117   // Decl and that the base Expr's are DeclRefExpr's with the same Decl or
13118   // the base Expr's are CXXThisExpr's.
13119   const Expr *LHSBase = LHSExpr;
13120   const Expr *RHSBase = RHSExpr;
13121   const MemberExpr *LHSME = dyn_cast<MemberExpr>(LHSExpr);
13122   const MemberExpr *RHSME = dyn_cast<MemberExpr>(RHSExpr);
13123   if (!LHSME || !RHSME)
13124     return;
13125 
13126   while (LHSME && RHSME) {
13127     if (LHSME->getMemberDecl()->getCanonicalDecl() !=
13128         RHSME->getMemberDecl()->getCanonicalDecl())
13129       return;
13130 
13131     LHSBase = LHSME->getBase();
13132     RHSBase = RHSME->getBase();
13133     LHSME = dyn_cast<MemberExpr>(LHSBase);
13134     RHSME = dyn_cast<MemberExpr>(RHSBase);
13135   }
13136 
13137   LHSDeclRef = dyn_cast<DeclRefExpr>(LHSBase);
13138   RHSDeclRef = dyn_cast<DeclRefExpr>(RHSBase);
13139   if (LHSDeclRef && RHSDeclRef) {
13140     if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
13141       return;
13142     if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
13143         RHSDeclRef->getDecl()->getCanonicalDecl())
13144       return;
13145 
13146     Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
13147                                         << LHSExpr->getSourceRange()
13148                                         << RHSExpr->getSourceRange();
13149     return;
13150   }
13151 
13152   if (isa<CXXThisExpr>(LHSBase) && isa<CXXThisExpr>(RHSBase))
13153     Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
13154                                         << LHSExpr->getSourceRange()
13155                                         << RHSExpr->getSourceRange();
13156 }
13157 
13158 //===--- Layout compatibility ----------------------------------------------//
13159 
13160 static bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2);
13161 
13162 /// Check if two enumeration types are layout-compatible.
13163 static bool isLayoutCompatible(ASTContext &C, EnumDecl *ED1, EnumDecl *ED2) {
13164   // C++11 [dcl.enum] p8:
13165   // Two enumeration types are layout-compatible if they have the same
13166   // underlying type.
13167   return ED1->isComplete() && ED2->isComplete() &&
13168          C.hasSameType(ED1->getIntegerType(), ED2->getIntegerType());
13169 }
13170 
13171 /// Check if two fields are layout-compatible.
13172 static bool isLayoutCompatible(ASTContext &C, FieldDecl *Field1,
13173                                FieldDecl *Field2) {
13174   if (!isLayoutCompatible(C, Field1->getType(), Field2->getType()))
13175     return false;
13176 
13177   if (Field1->isBitField() != Field2->isBitField())
13178     return false;
13179 
13180   if (Field1->isBitField()) {
13181     // Make sure that the bit-fields are the same length.
13182     unsigned Bits1 = Field1->getBitWidthValue(C);
13183     unsigned Bits2 = Field2->getBitWidthValue(C);
13184 
13185     if (Bits1 != Bits2)
13186       return false;
13187   }
13188 
13189   return true;
13190 }
13191 
13192 /// Check if two standard-layout structs are layout-compatible.
13193 /// (C++11 [class.mem] p17)
13194 static bool isLayoutCompatibleStruct(ASTContext &C, RecordDecl *RD1,
13195                                      RecordDecl *RD2) {
13196   // If both records are C++ classes, check that base classes match.
13197   if (const CXXRecordDecl *D1CXX = dyn_cast<CXXRecordDecl>(RD1)) {
13198     // If one of records is a CXXRecordDecl we are in C++ mode,
13199     // thus the other one is a CXXRecordDecl, too.
13200     const CXXRecordDecl *D2CXX = cast<CXXRecordDecl>(RD2);
13201     // Check number of base classes.
13202     if (D1CXX->getNumBases() != D2CXX->getNumBases())
13203       return false;
13204 
13205     // Check the base classes.
13206     for (CXXRecordDecl::base_class_const_iterator
13207                Base1 = D1CXX->bases_begin(),
13208            BaseEnd1 = D1CXX->bases_end(),
13209               Base2 = D2CXX->bases_begin();
13210          Base1 != BaseEnd1;
13211          ++Base1, ++Base2) {
13212       if (!isLayoutCompatible(C, Base1->getType(), Base2->getType()))
13213         return false;
13214     }
13215   } else if (const CXXRecordDecl *D2CXX = dyn_cast<CXXRecordDecl>(RD2)) {
13216     // If only RD2 is a C++ class, it should have zero base classes.
13217     if (D2CXX->getNumBases() > 0)
13218       return false;
13219   }
13220 
13221   // Check the fields.
13222   RecordDecl::field_iterator Field2 = RD2->field_begin(),
13223                              Field2End = RD2->field_end(),
13224                              Field1 = RD1->field_begin(),
13225                              Field1End = RD1->field_end();
13226   for ( ; Field1 != Field1End && Field2 != Field2End; ++Field1, ++Field2) {
13227     if (!isLayoutCompatible(C, *Field1, *Field2))
13228       return false;
13229   }
13230   if (Field1 != Field1End || Field2 != Field2End)
13231     return false;
13232 
13233   return true;
13234 }
13235 
13236 /// Check if two standard-layout unions are layout-compatible.
13237 /// (C++11 [class.mem] p18)
13238 static bool isLayoutCompatibleUnion(ASTContext &C, RecordDecl *RD1,
13239                                     RecordDecl *RD2) {
13240   llvm::SmallPtrSet<FieldDecl *, 8> UnmatchedFields;
13241   for (auto *Field2 : RD2->fields())
13242     UnmatchedFields.insert(Field2);
13243 
13244   for (auto *Field1 : RD1->fields()) {
13245     llvm::SmallPtrSet<FieldDecl *, 8>::iterator
13246         I = UnmatchedFields.begin(),
13247         E = UnmatchedFields.end();
13248 
13249     for ( ; I != E; ++I) {
13250       if (isLayoutCompatible(C, Field1, *I)) {
13251         bool Result = UnmatchedFields.erase(*I);
13252         (void) Result;
13253         assert(Result);
13254         break;
13255       }
13256     }
13257     if (I == E)
13258       return false;
13259   }
13260 
13261   return UnmatchedFields.empty();
13262 }
13263 
13264 static bool isLayoutCompatible(ASTContext &C, RecordDecl *RD1,
13265                                RecordDecl *RD2) {
13266   if (RD1->isUnion() != RD2->isUnion())
13267     return false;
13268 
13269   if (RD1->isUnion())
13270     return isLayoutCompatibleUnion(C, RD1, RD2);
13271   else
13272     return isLayoutCompatibleStruct(C, RD1, RD2);
13273 }
13274 
13275 /// Check if two types are layout-compatible in C++11 sense.
13276 static bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2) {
13277   if (T1.isNull() || T2.isNull())
13278     return false;
13279 
13280   // C++11 [basic.types] p11:
13281   // If two types T1 and T2 are the same type, then T1 and T2 are
13282   // layout-compatible types.
13283   if (C.hasSameType(T1, T2))
13284     return true;
13285 
13286   T1 = T1.getCanonicalType().getUnqualifiedType();
13287   T2 = T2.getCanonicalType().getUnqualifiedType();
13288 
13289   const Type::TypeClass TC1 = T1->getTypeClass();
13290   const Type::TypeClass TC2 = T2->getTypeClass();
13291 
13292   if (TC1 != TC2)
13293     return false;
13294 
13295   if (TC1 == Type::Enum) {
13296     return isLayoutCompatible(C,
13297                               cast<EnumType>(T1)->getDecl(),
13298                               cast<EnumType>(T2)->getDecl());
13299   } else if (TC1 == Type::Record) {
13300     if (!T1->isStandardLayoutType() || !T2->isStandardLayoutType())
13301       return false;
13302 
13303     return isLayoutCompatible(C,
13304                               cast<RecordType>(T1)->getDecl(),
13305                               cast<RecordType>(T2)->getDecl());
13306   }
13307 
13308   return false;
13309 }
13310 
13311 //===--- CHECK: pointer_with_type_tag attribute: datatypes should match ----//
13312 
13313 /// Given a type tag expression find the type tag itself.
13314 ///
13315 /// \param TypeExpr Type tag expression, as it appears in user's code.
13316 ///
13317 /// \param VD Declaration of an identifier that appears in a type tag.
13318 ///
13319 /// \param MagicValue Type tag magic value.
13320 static bool FindTypeTagExpr(const Expr *TypeExpr, const ASTContext &Ctx,
13321                             const ValueDecl **VD, uint64_t *MagicValue) {
13322   while(true) {
13323     if (!TypeExpr)
13324       return false;
13325 
13326     TypeExpr = TypeExpr->IgnoreParenImpCasts()->IgnoreParenCasts();
13327 
13328     switch (TypeExpr->getStmtClass()) {
13329     case Stmt::UnaryOperatorClass: {
13330       const UnaryOperator *UO = cast<UnaryOperator>(TypeExpr);
13331       if (UO->getOpcode() == UO_AddrOf || UO->getOpcode() == UO_Deref) {
13332         TypeExpr = UO->getSubExpr();
13333         continue;
13334       }
13335       return false;
13336     }
13337 
13338     case Stmt::DeclRefExprClass: {
13339       const DeclRefExpr *DRE = cast<DeclRefExpr>(TypeExpr);
13340       *VD = DRE->getDecl();
13341       return true;
13342     }
13343 
13344     case Stmt::IntegerLiteralClass: {
13345       const IntegerLiteral *IL = cast<IntegerLiteral>(TypeExpr);
13346       llvm::APInt MagicValueAPInt = IL->getValue();
13347       if (MagicValueAPInt.getActiveBits() <= 64) {
13348         *MagicValue = MagicValueAPInt.getZExtValue();
13349         return true;
13350       } else
13351         return false;
13352     }
13353 
13354     case Stmt::BinaryConditionalOperatorClass:
13355     case Stmt::ConditionalOperatorClass: {
13356       const AbstractConditionalOperator *ACO =
13357           cast<AbstractConditionalOperator>(TypeExpr);
13358       bool Result;
13359       if (ACO->getCond()->EvaluateAsBooleanCondition(Result, Ctx)) {
13360         if (Result)
13361           TypeExpr = ACO->getTrueExpr();
13362         else
13363           TypeExpr = ACO->getFalseExpr();
13364         continue;
13365       }
13366       return false;
13367     }
13368 
13369     case Stmt::BinaryOperatorClass: {
13370       const BinaryOperator *BO = cast<BinaryOperator>(TypeExpr);
13371       if (BO->getOpcode() == BO_Comma) {
13372         TypeExpr = BO->getRHS();
13373         continue;
13374       }
13375       return false;
13376     }
13377 
13378     default:
13379       return false;
13380     }
13381   }
13382 }
13383 
13384 /// Retrieve the C type corresponding to type tag TypeExpr.
13385 ///
13386 /// \param TypeExpr Expression that specifies a type tag.
13387 ///
13388 /// \param MagicValues Registered magic values.
13389 ///
13390 /// \param FoundWrongKind Set to true if a type tag was found, but of a wrong
13391 ///        kind.
13392 ///
13393 /// \param TypeInfo Information about the corresponding C type.
13394 ///
13395 /// \returns true if the corresponding C type was found.
13396 static bool GetMatchingCType(
13397         const IdentifierInfo *ArgumentKind,
13398         const Expr *TypeExpr, const ASTContext &Ctx,
13399         const llvm::DenseMap<Sema::TypeTagMagicValue,
13400                              Sema::TypeTagData> *MagicValues,
13401         bool &FoundWrongKind,
13402         Sema::TypeTagData &TypeInfo) {
13403   FoundWrongKind = false;
13404 
13405   // Variable declaration that has type_tag_for_datatype attribute.
13406   const ValueDecl *VD = nullptr;
13407 
13408   uint64_t MagicValue;
13409 
13410   if (!FindTypeTagExpr(TypeExpr, Ctx, &VD, &MagicValue))
13411     return false;
13412 
13413   if (VD) {
13414     if (TypeTagForDatatypeAttr *I = VD->getAttr<TypeTagForDatatypeAttr>()) {
13415       if (I->getArgumentKind() != ArgumentKind) {
13416         FoundWrongKind = true;
13417         return false;
13418       }
13419       TypeInfo.Type = I->getMatchingCType();
13420       TypeInfo.LayoutCompatible = I->getLayoutCompatible();
13421       TypeInfo.MustBeNull = I->getMustBeNull();
13422       return true;
13423     }
13424     return false;
13425   }
13426 
13427   if (!MagicValues)
13428     return false;
13429 
13430   llvm::DenseMap<Sema::TypeTagMagicValue,
13431                  Sema::TypeTagData>::const_iterator I =
13432       MagicValues->find(std::make_pair(ArgumentKind, MagicValue));
13433   if (I == MagicValues->end())
13434     return false;
13435 
13436   TypeInfo = I->second;
13437   return true;
13438 }
13439 
13440 void Sema::RegisterTypeTagForDatatype(const IdentifierInfo *ArgumentKind,
13441                                       uint64_t MagicValue, QualType Type,
13442                                       bool LayoutCompatible,
13443                                       bool MustBeNull) {
13444   if (!TypeTagForDatatypeMagicValues)
13445     TypeTagForDatatypeMagicValues.reset(
13446         new llvm::DenseMap<TypeTagMagicValue, TypeTagData>);
13447 
13448   TypeTagMagicValue Magic(ArgumentKind, MagicValue);
13449   (*TypeTagForDatatypeMagicValues)[Magic] =
13450       TypeTagData(Type, LayoutCompatible, MustBeNull);
13451 }
13452 
13453 static bool IsSameCharType(QualType T1, QualType T2) {
13454   const BuiltinType *BT1 = T1->getAs<BuiltinType>();
13455   if (!BT1)
13456     return false;
13457 
13458   const BuiltinType *BT2 = T2->getAs<BuiltinType>();
13459   if (!BT2)
13460     return false;
13461 
13462   BuiltinType::Kind T1Kind = BT1->getKind();
13463   BuiltinType::Kind T2Kind = BT2->getKind();
13464 
13465   return (T1Kind == BuiltinType::SChar  && T2Kind == BuiltinType::Char_S) ||
13466          (T1Kind == BuiltinType::UChar  && T2Kind == BuiltinType::Char_U) ||
13467          (T1Kind == BuiltinType::Char_U && T2Kind == BuiltinType::UChar) ||
13468          (T1Kind == BuiltinType::Char_S && T2Kind == BuiltinType::SChar);
13469 }
13470 
13471 void Sema::CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
13472                                     const ArrayRef<const Expr *> ExprArgs,
13473                                     SourceLocation CallSiteLoc) {
13474   const IdentifierInfo *ArgumentKind = Attr->getArgumentKind();
13475   bool IsPointerAttr = Attr->getIsPointer();
13476 
13477   // Retrieve the argument representing the 'type_tag'.
13478   unsigned TypeTagIdxAST = Attr->getTypeTagIdx().getASTIndex();
13479   if (TypeTagIdxAST >= ExprArgs.size()) {
13480     Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
13481         << 0 << Attr->getTypeTagIdx().getSourceIndex();
13482     return;
13483   }
13484   const Expr *TypeTagExpr = ExprArgs[TypeTagIdxAST];
13485   bool FoundWrongKind;
13486   TypeTagData TypeInfo;
13487   if (!GetMatchingCType(ArgumentKind, TypeTagExpr, Context,
13488                         TypeTagForDatatypeMagicValues.get(),
13489                         FoundWrongKind, TypeInfo)) {
13490     if (FoundWrongKind)
13491       Diag(TypeTagExpr->getExprLoc(),
13492            diag::warn_type_tag_for_datatype_wrong_kind)
13493         << TypeTagExpr->getSourceRange();
13494     return;
13495   }
13496 
13497   // Retrieve the argument representing the 'arg_idx'.
13498   unsigned ArgumentIdxAST = Attr->getArgumentIdx().getASTIndex();
13499   if (ArgumentIdxAST >= ExprArgs.size()) {
13500     Diag(CallSiteLoc, diag::err_tag_index_out_of_range)
13501         << 1 << Attr->getArgumentIdx().getSourceIndex();
13502     return;
13503   }
13504   const Expr *ArgumentExpr = ExprArgs[ArgumentIdxAST];
13505   if (IsPointerAttr) {
13506     // Skip implicit cast of pointer to `void *' (as a function argument).
13507     if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgumentExpr))
13508       if (ICE->getType()->isVoidPointerType() &&
13509           ICE->getCastKind() == CK_BitCast)
13510         ArgumentExpr = ICE->getSubExpr();
13511   }
13512   QualType ArgumentType = ArgumentExpr->getType();
13513 
13514   // Passing a `void*' pointer shouldn't trigger a warning.
13515   if (IsPointerAttr && ArgumentType->isVoidPointerType())
13516     return;
13517 
13518   if (TypeInfo.MustBeNull) {
13519     // Type tag with matching void type requires a null pointer.
13520     if (!ArgumentExpr->isNullPointerConstant(Context,
13521                                              Expr::NPC_ValueDependentIsNotNull)) {
13522       Diag(ArgumentExpr->getExprLoc(),
13523            diag::warn_type_safety_null_pointer_required)
13524           << ArgumentKind->getName()
13525           << ArgumentExpr->getSourceRange()
13526           << TypeTagExpr->getSourceRange();
13527     }
13528     return;
13529   }
13530 
13531   QualType RequiredType = TypeInfo.Type;
13532   if (IsPointerAttr)
13533     RequiredType = Context.getPointerType(RequiredType);
13534 
13535   bool mismatch = false;
13536   if (!TypeInfo.LayoutCompatible) {
13537     mismatch = !Context.hasSameType(ArgumentType, RequiredType);
13538 
13539     // C++11 [basic.fundamental] p1:
13540     // Plain char, signed char, and unsigned char are three distinct types.
13541     //
13542     // But we treat plain `char' as equivalent to `signed char' or `unsigned
13543     // char' depending on the current char signedness mode.
13544     if (mismatch)
13545       if ((IsPointerAttr && IsSameCharType(ArgumentType->getPointeeType(),
13546                                            RequiredType->getPointeeType())) ||
13547           (!IsPointerAttr && IsSameCharType(ArgumentType, RequiredType)))
13548         mismatch = false;
13549   } else
13550     if (IsPointerAttr)
13551       mismatch = !isLayoutCompatible(Context,
13552                                      ArgumentType->getPointeeType(),
13553                                      RequiredType->getPointeeType());
13554     else
13555       mismatch = !isLayoutCompatible(Context, ArgumentType, RequiredType);
13556 
13557   if (mismatch)
13558     Diag(ArgumentExpr->getExprLoc(), diag::warn_type_safety_type_mismatch)
13559         << ArgumentType << ArgumentKind
13560         << TypeInfo.LayoutCompatible << RequiredType
13561         << ArgumentExpr->getSourceRange()
13562         << TypeTagExpr->getSourceRange();
13563 }
13564 
13565 void Sema::AddPotentialMisalignedMembers(Expr *E, RecordDecl *RD, ValueDecl *MD,
13566                                          CharUnits Alignment) {
13567   MisalignedMembers.emplace_back(E, RD, MD, Alignment);
13568 }
13569 
13570 void Sema::DiagnoseMisalignedMembers() {
13571   for (MisalignedMember &m : MisalignedMembers) {
13572     const NamedDecl *ND = m.RD;
13573     if (ND->getName().empty()) {
13574       if (const TypedefNameDecl *TD = m.RD->getTypedefNameForAnonDecl())
13575         ND = TD;
13576     }
13577     Diag(m.E->getBeginLoc(), diag::warn_taking_address_of_packed_member)
13578         << m.MD << ND << m.E->getSourceRange();
13579   }
13580   MisalignedMembers.clear();
13581 }
13582 
13583 void Sema::DiscardMisalignedMemberAddress(const Type *T, Expr *E) {
13584   E = E->IgnoreParens();
13585   if (!T->isPointerType() && !T->isIntegerType())
13586     return;
13587   if (isa<UnaryOperator>(E) &&
13588       cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf) {
13589     auto *Op = cast<UnaryOperator>(E)->getSubExpr()->IgnoreParens();
13590     if (isa<MemberExpr>(Op)) {
13591       auto MA = std::find(MisalignedMembers.begin(), MisalignedMembers.end(),
13592                           MisalignedMember(Op));
13593       if (MA != MisalignedMembers.end() &&
13594           (T->isIntegerType() ||
13595            (T->isPointerType() && (T->getPointeeType()->isIncompleteType() ||
13596                                    Context.getTypeAlignInChars(
13597                                        T->getPointeeType()) <= MA->Alignment))))
13598         MisalignedMembers.erase(MA);
13599     }
13600   }
13601 }
13602 
13603 void Sema::RefersToMemberWithReducedAlignment(
13604     Expr *E,
13605     llvm::function_ref<void(Expr *, RecordDecl *, FieldDecl *, CharUnits)>
13606         Action) {
13607   const auto *ME = dyn_cast<MemberExpr>(E);
13608   if (!ME)
13609     return;
13610 
13611   // No need to check expressions with an __unaligned-qualified type.
13612   if (E->getType().getQualifiers().hasUnaligned())
13613     return;
13614 
13615   // For a chain of MemberExpr like "a.b.c.d" this list
13616   // will keep FieldDecl's like [d, c, b].
13617   SmallVector<FieldDecl *, 4> ReverseMemberChain;
13618   const MemberExpr *TopME = nullptr;
13619   bool AnyIsPacked = false;
13620   do {
13621     QualType BaseType = ME->getBase()->getType();
13622     if (ME->isArrow())
13623       BaseType = BaseType->getPointeeType();
13624     RecordDecl *RD = BaseType->getAs<RecordType>()->getDecl();
13625     if (RD->isInvalidDecl())
13626       return;
13627 
13628     ValueDecl *MD = ME->getMemberDecl();
13629     auto *FD = dyn_cast<FieldDecl>(MD);
13630     // We do not care about non-data members.
13631     if (!FD || FD->isInvalidDecl())
13632       return;
13633 
13634     AnyIsPacked =
13635         AnyIsPacked || (RD->hasAttr<PackedAttr>() || MD->hasAttr<PackedAttr>());
13636     ReverseMemberChain.push_back(FD);
13637 
13638     TopME = ME;
13639     ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParens());
13640   } while (ME);
13641   assert(TopME && "We did not compute a topmost MemberExpr!");
13642 
13643   // Not the scope of this diagnostic.
13644   if (!AnyIsPacked)
13645     return;
13646 
13647   const Expr *TopBase = TopME->getBase()->IgnoreParenImpCasts();
13648   const auto *DRE = dyn_cast<DeclRefExpr>(TopBase);
13649   // TODO: The innermost base of the member expression may be too complicated.
13650   // For now, just disregard these cases. This is left for future
13651   // improvement.
13652   if (!DRE && !isa<CXXThisExpr>(TopBase))
13653       return;
13654 
13655   // Alignment expected by the whole expression.
13656   CharUnits ExpectedAlignment = Context.getTypeAlignInChars(E->getType());
13657 
13658   // No need to do anything else with this case.
13659   if (ExpectedAlignment.isOne())
13660     return;
13661 
13662   // Synthesize offset of the whole access.
13663   CharUnits Offset;
13664   for (auto I = ReverseMemberChain.rbegin(); I != ReverseMemberChain.rend();
13665        I++) {
13666     Offset += Context.toCharUnitsFromBits(Context.getFieldOffset(*I));
13667   }
13668 
13669   // Compute the CompleteObjectAlignment as the alignment of the whole chain.
13670   CharUnits CompleteObjectAlignment = Context.getTypeAlignInChars(
13671       ReverseMemberChain.back()->getParent()->getTypeForDecl());
13672 
13673   // The base expression of the innermost MemberExpr may give
13674   // stronger guarantees than the class containing the member.
13675   if (DRE && !TopME->isArrow()) {
13676     const ValueDecl *VD = DRE->getDecl();
13677     if (!VD->getType()->isReferenceType())
13678       CompleteObjectAlignment =
13679           std::max(CompleteObjectAlignment, Context.getDeclAlign(VD));
13680   }
13681 
13682   // Check if the synthesized offset fulfills the alignment.
13683   if (Offset % ExpectedAlignment != 0 ||
13684       // It may fulfill the offset it but the effective alignment may still be
13685       // lower than the expected expression alignment.
13686       CompleteObjectAlignment < ExpectedAlignment) {
13687     // If this happens, we want to determine a sensible culprit of this.
13688     // Intuitively, watching the chain of member expressions from right to
13689     // left, we start with the required alignment (as required by the field
13690     // type) but some packed attribute in that chain has reduced the alignment.
13691     // It may happen that another packed structure increases it again. But if
13692     // we are here such increase has not been enough. So pointing the first
13693     // FieldDecl that either is packed or else its RecordDecl is,
13694     // seems reasonable.
13695     FieldDecl *FD = nullptr;
13696     CharUnits Alignment;
13697     for (FieldDecl *FDI : ReverseMemberChain) {
13698       if (FDI->hasAttr<PackedAttr>() ||
13699           FDI->getParent()->hasAttr<PackedAttr>()) {
13700         FD = FDI;
13701         Alignment = std::min(
13702             Context.getTypeAlignInChars(FD->getType()),
13703             Context.getTypeAlignInChars(FD->getParent()->getTypeForDecl()));
13704         break;
13705       }
13706     }
13707     assert(FD && "We did not find a packed FieldDecl!");
13708     Action(E, FD->getParent(), FD, Alignment);
13709   }
13710 }
13711 
13712 void Sema::CheckAddressOfPackedMember(Expr *rhs) {
13713   using namespace std::placeholders;
13714 
13715   RefersToMemberWithReducedAlignment(
13716       rhs, std::bind(&Sema::AddPotentialMisalignedMembers, std::ref(*this), _1,
13717                      _2, _3, _4));
13718 }
13719