1 //===---- StmtProfile.cpp - Profile implementation for Stmt ASTs ----------===//
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 the Stmt::Profile method, which builds a unique bit
11 // representation that identifies a statement/expression.
12 //
13 //===----------------------------------------------------------------------===//
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/DeclCXX.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/DeclTemplate.h"
18 #include "clang/AST/Expr.h"
19 #include "clang/AST/ExprCXX.h"
20 #include "clang/AST/ExprObjC.h"
21 #include "clang/AST/StmtVisitor.h"
22 #include "llvm/ADT/FoldingSet.h"
23 using namespace clang;
24 
25 namespace {
26   class StmtProfiler : public ConstStmtVisitor<StmtProfiler> {
27     llvm::FoldingSetNodeID &ID;
28     const ASTContext &Context;
29     bool Canonical;
30 
31   public:
32     StmtProfiler(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
33                  bool Canonical)
34       : ID(ID), Context(Context), Canonical(Canonical) { }
35 
36     void VisitStmt(const Stmt *S);
37 
38 #define STMT(Node, Base) void Visit##Node(const Node *S);
39 #include "clang/AST/StmtNodes.inc"
40 
41     /// \brief Visit a declaration that is referenced within an expression
42     /// or statement.
43     void VisitDecl(const Decl *D);
44 
45     /// \brief Visit a type that is referenced within an expression or
46     /// statement.
47     void VisitType(QualType T);
48 
49     /// \brief Visit a name that occurs within an expression or statement.
50     void VisitName(DeclarationName Name);
51 
52     /// \brief Visit a nested-name-specifier that occurs within an expression
53     /// or statement.
54     void VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
55 
56     /// \brief Visit a template name that occurs within an expression or
57     /// statement.
58     void VisitTemplateName(TemplateName Name);
59 
60     /// \brief Visit template arguments that occur within an expression or
61     /// statement.
62     void VisitTemplateArguments(const TemplateArgumentLoc *Args,
63                                 unsigned NumArgs);
64 
65     /// \brief Visit a single template argument.
66     void VisitTemplateArgument(const TemplateArgument &Arg);
67   };
68 }
69 
70 void StmtProfiler::VisitStmt(const Stmt *S) {
71   ID.AddInteger(S->getStmtClass());
72   for (Stmt::const_child_range C = S->children(); C; ++C) {
73     if (*C)
74       Visit(*C);
75     else
76       ID.AddInteger(0);
77   }
78 }
79 
80 void StmtProfiler::VisitDeclStmt(const DeclStmt *S) {
81   VisitStmt(S);
82   for (const auto *D : S->decls())
83     VisitDecl(D);
84 }
85 
86 void StmtProfiler::VisitNullStmt(const NullStmt *S) {
87   VisitStmt(S);
88 }
89 
90 void StmtProfiler::VisitCompoundStmt(const CompoundStmt *S) {
91   VisitStmt(S);
92 }
93 
94 void StmtProfiler::VisitSwitchCase(const SwitchCase *S) {
95   VisitStmt(S);
96 }
97 
98 void StmtProfiler::VisitCaseStmt(const CaseStmt *S) {
99   VisitStmt(S);
100 }
101 
102 void StmtProfiler::VisitDefaultStmt(const DefaultStmt *S) {
103   VisitStmt(S);
104 }
105 
106 void StmtProfiler::VisitLabelStmt(const LabelStmt *S) {
107   VisitStmt(S);
108   VisitDecl(S->getDecl());
109 }
110 
111 void StmtProfiler::VisitAttributedStmt(const AttributedStmt *S) {
112   VisitStmt(S);
113   // TODO: maybe visit attributes?
114 }
115 
116 void StmtProfiler::VisitIfStmt(const IfStmt *S) {
117   VisitStmt(S);
118   VisitDecl(S->getConditionVariable());
119 }
120 
121 void StmtProfiler::VisitSwitchStmt(const SwitchStmt *S) {
122   VisitStmt(S);
123   VisitDecl(S->getConditionVariable());
124 }
125 
126 void StmtProfiler::VisitWhileStmt(const WhileStmt *S) {
127   VisitStmt(S);
128   VisitDecl(S->getConditionVariable());
129 }
130 
131 void StmtProfiler::VisitDoStmt(const DoStmt *S) {
132   VisitStmt(S);
133 }
134 
135 void StmtProfiler::VisitForStmt(const ForStmt *S) {
136   VisitStmt(S);
137 }
138 
139 void StmtProfiler::VisitGotoStmt(const GotoStmt *S) {
140   VisitStmt(S);
141   VisitDecl(S->getLabel());
142 }
143 
144 void StmtProfiler::VisitIndirectGotoStmt(const IndirectGotoStmt *S) {
145   VisitStmt(S);
146 }
147 
148 void StmtProfiler::VisitContinueStmt(const ContinueStmt *S) {
149   VisitStmt(S);
150 }
151 
152 void StmtProfiler::VisitBreakStmt(const BreakStmt *S) {
153   VisitStmt(S);
154 }
155 
156 void StmtProfiler::VisitReturnStmt(const ReturnStmt *S) {
157   VisitStmt(S);
158 }
159 
160 void StmtProfiler::VisitGCCAsmStmt(const GCCAsmStmt *S) {
161   VisitStmt(S);
162   ID.AddBoolean(S->isVolatile());
163   ID.AddBoolean(S->isSimple());
164   VisitStringLiteral(S->getAsmString());
165   ID.AddInteger(S->getNumOutputs());
166   for (unsigned I = 0, N = S->getNumOutputs(); I != N; ++I) {
167     ID.AddString(S->getOutputName(I));
168     VisitStringLiteral(S->getOutputConstraintLiteral(I));
169   }
170   ID.AddInteger(S->getNumInputs());
171   for (unsigned I = 0, N = S->getNumInputs(); I != N; ++I) {
172     ID.AddString(S->getInputName(I));
173     VisitStringLiteral(S->getInputConstraintLiteral(I));
174   }
175   ID.AddInteger(S->getNumClobbers());
176   for (unsigned I = 0, N = S->getNumClobbers(); I != N; ++I)
177     VisitStringLiteral(S->getClobberStringLiteral(I));
178 }
179 
180 void StmtProfiler::VisitMSAsmStmt(const MSAsmStmt *S) {
181   // FIXME: Implement MS style inline asm statement profiler.
182   VisitStmt(S);
183 }
184 
185 void StmtProfiler::VisitCXXCatchStmt(const CXXCatchStmt *S) {
186   VisitStmt(S);
187   VisitType(S->getCaughtType());
188 }
189 
190 void StmtProfiler::VisitCXXTryStmt(const CXXTryStmt *S) {
191   VisitStmt(S);
192 }
193 
194 void StmtProfiler::VisitCXXForRangeStmt(const CXXForRangeStmt *S) {
195   VisitStmt(S);
196 }
197 
198 void StmtProfiler::VisitMSDependentExistsStmt(const MSDependentExistsStmt *S) {
199   VisitStmt(S);
200   ID.AddBoolean(S->isIfExists());
201   VisitNestedNameSpecifier(S->getQualifierLoc().getNestedNameSpecifier());
202   VisitName(S->getNameInfo().getName());
203 }
204 
205 void StmtProfiler::VisitSEHTryStmt(const SEHTryStmt *S) {
206   VisitStmt(S);
207 }
208 
209 void StmtProfiler::VisitSEHFinallyStmt(const SEHFinallyStmt *S) {
210   VisitStmt(S);
211 }
212 
213 void StmtProfiler::VisitSEHExceptStmt(const SEHExceptStmt *S) {
214   VisitStmt(S);
215 }
216 
217 void StmtProfiler::VisitCapturedStmt(const CapturedStmt *S) {
218   VisitStmt(S);
219 }
220 
221 void StmtProfiler::VisitObjCForCollectionStmt(const ObjCForCollectionStmt *S) {
222   VisitStmt(S);
223 }
224 
225 void StmtProfiler::VisitObjCAtCatchStmt(const ObjCAtCatchStmt *S) {
226   VisitStmt(S);
227   ID.AddBoolean(S->hasEllipsis());
228   if (S->getCatchParamDecl())
229     VisitType(S->getCatchParamDecl()->getType());
230 }
231 
232 void StmtProfiler::VisitObjCAtFinallyStmt(const ObjCAtFinallyStmt *S) {
233   VisitStmt(S);
234 }
235 
236 void StmtProfiler::VisitObjCAtTryStmt(const ObjCAtTryStmt *S) {
237   VisitStmt(S);
238 }
239 
240 void
241 StmtProfiler::VisitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt *S) {
242   VisitStmt(S);
243 }
244 
245 void StmtProfiler::VisitObjCAtThrowStmt(const ObjCAtThrowStmt *S) {
246   VisitStmt(S);
247 }
248 
249 void
250 StmtProfiler::VisitObjCAutoreleasePoolStmt(const ObjCAutoreleasePoolStmt *S) {
251   VisitStmt(S);
252 }
253 
254 namespace {
255 class OMPClauseProfiler : public ConstOMPClauseVisitor<OMPClauseProfiler> {
256   StmtProfiler *Profiler;
257   /// \brief Process clauses with list of variables.
258   template <typename T>
259   void VisitOMPClauseList(T *Node);
260 public:
261   OMPClauseProfiler(StmtProfiler *P) : Profiler(P) { }
262 #define OPENMP_CLAUSE(Name, Class)                                             \
263   void Visit##Class(const Class *C);
264 #include "clang/Basic/OpenMPKinds.def"
265 };
266 
267 void OMPClauseProfiler::VisitOMPIfClause(const OMPIfClause *C) {
268   if (C->getCondition())
269     Profiler->VisitStmt(C->getCondition());
270 }
271 
272 void OMPClauseProfiler::VisitOMPNumThreadsClause(const OMPNumThreadsClause *C) {
273   if (C->getNumThreads())
274     Profiler->VisitStmt(C->getNumThreads());
275 }
276 
277 void OMPClauseProfiler::VisitOMPSafelenClause(const OMPSafelenClause *C) {
278   if (C->getSafelen())
279     Profiler->VisitStmt(C->getSafelen());
280 }
281 
282 void OMPClauseProfiler::VisitOMPDefaultClause(const OMPDefaultClause *C) { }
283 
284 template<typename T>
285 void OMPClauseProfiler::VisitOMPClauseList(T *Node) {
286   for (auto *I : Node->varlists())
287     Profiler->VisitStmt(I);
288 }
289 
290 void OMPClauseProfiler::VisitOMPPrivateClause(const OMPPrivateClause *C) {
291   VisitOMPClauseList(C);
292 }
293 void OMPClauseProfiler::VisitOMPFirstprivateClause(
294                                          const OMPFirstprivateClause *C) {
295   VisitOMPClauseList(C);
296 }
297 void OMPClauseProfiler::VisitOMPSharedClause(const OMPSharedClause *C) {
298   VisitOMPClauseList(C);
299 }
300 void OMPClauseProfiler::VisitOMPCopyinClause(const OMPCopyinClause *C) {
301   VisitOMPClauseList(C);
302 }
303 }
304 
305 void
306 StmtProfiler::VisitOMPExecutableDirective(const OMPExecutableDirective *S) {
307   VisitStmt(S);
308   OMPClauseProfiler P(this);
309   ArrayRef<OMPClause *> Clauses = S->clauses();
310   for (ArrayRef<OMPClause *>::iterator I = Clauses.begin(), E = Clauses.end();
311        I != E; ++I)
312     if (*I)
313       P.Visit(*I);
314 }
315 
316 void StmtProfiler::VisitOMPParallelDirective(const OMPParallelDirective *S) {
317   VisitOMPExecutableDirective(S);
318 }
319 
320 void StmtProfiler::VisitOMPSimdDirective(const OMPSimdDirective *S) {
321   VisitOMPExecutableDirective(S);
322 }
323 
324 void StmtProfiler::VisitExpr(const Expr *S) {
325   VisitStmt(S);
326 }
327 
328 void StmtProfiler::VisitDeclRefExpr(const DeclRefExpr *S) {
329   VisitExpr(S);
330   if (!Canonical)
331     VisitNestedNameSpecifier(S->getQualifier());
332   VisitDecl(S->getDecl());
333   if (!Canonical)
334     VisitTemplateArguments(S->getTemplateArgs(), S->getNumTemplateArgs());
335 }
336 
337 void StmtProfiler::VisitPredefinedExpr(const PredefinedExpr *S) {
338   VisitExpr(S);
339   ID.AddInteger(S->getIdentType());
340 }
341 
342 void StmtProfiler::VisitIntegerLiteral(const IntegerLiteral *S) {
343   VisitExpr(S);
344   S->getValue().Profile(ID);
345 }
346 
347 void StmtProfiler::VisitCharacterLiteral(const CharacterLiteral *S) {
348   VisitExpr(S);
349   ID.AddInteger(S->getKind());
350   ID.AddInteger(S->getValue());
351 }
352 
353 void StmtProfiler::VisitFloatingLiteral(const FloatingLiteral *S) {
354   VisitExpr(S);
355   S->getValue().Profile(ID);
356   ID.AddBoolean(S->isExact());
357 }
358 
359 void StmtProfiler::VisitImaginaryLiteral(const ImaginaryLiteral *S) {
360   VisitExpr(S);
361 }
362 
363 void StmtProfiler::VisitStringLiteral(const StringLiteral *S) {
364   VisitExpr(S);
365   ID.AddString(S->getBytes());
366   ID.AddInteger(S->getKind());
367 }
368 
369 void StmtProfiler::VisitParenExpr(const ParenExpr *S) {
370   VisitExpr(S);
371 }
372 
373 void StmtProfiler::VisitParenListExpr(const ParenListExpr *S) {
374   VisitExpr(S);
375 }
376 
377 void StmtProfiler::VisitUnaryOperator(const UnaryOperator *S) {
378   VisitExpr(S);
379   ID.AddInteger(S->getOpcode());
380 }
381 
382 void StmtProfiler::VisitOffsetOfExpr(const OffsetOfExpr *S) {
383   VisitType(S->getTypeSourceInfo()->getType());
384   unsigned n = S->getNumComponents();
385   for (unsigned i = 0; i < n; ++i) {
386     const OffsetOfExpr::OffsetOfNode& ON = S->getComponent(i);
387     ID.AddInteger(ON.getKind());
388     switch (ON.getKind()) {
389     case OffsetOfExpr::OffsetOfNode::Array:
390       // Expressions handled below.
391       break;
392 
393     case OffsetOfExpr::OffsetOfNode::Field:
394       VisitDecl(ON.getField());
395       break;
396 
397     case OffsetOfExpr::OffsetOfNode::Identifier:
398       ID.AddPointer(ON.getFieldName());
399       break;
400 
401     case OffsetOfExpr::OffsetOfNode::Base:
402       // These nodes are implicit, and therefore don't need profiling.
403       break;
404     }
405   }
406 
407   VisitExpr(S);
408 }
409 
410 void
411 StmtProfiler::VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *S) {
412   VisitExpr(S);
413   ID.AddInteger(S->getKind());
414   if (S->isArgumentType())
415     VisitType(S->getArgumentType());
416 }
417 
418 void StmtProfiler::VisitArraySubscriptExpr(const ArraySubscriptExpr *S) {
419   VisitExpr(S);
420 }
421 
422 void StmtProfiler::VisitCallExpr(const CallExpr *S) {
423   VisitExpr(S);
424 }
425 
426 void StmtProfiler::VisitMemberExpr(const MemberExpr *S) {
427   VisitExpr(S);
428   VisitDecl(S->getMemberDecl());
429   if (!Canonical)
430     VisitNestedNameSpecifier(S->getQualifier());
431   ID.AddBoolean(S->isArrow());
432 }
433 
434 void StmtProfiler::VisitCompoundLiteralExpr(const CompoundLiteralExpr *S) {
435   VisitExpr(S);
436   ID.AddBoolean(S->isFileScope());
437 }
438 
439 void StmtProfiler::VisitCastExpr(const CastExpr *S) {
440   VisitExpr(S);
441 }
442 
443 void StmtProfiler::VisitImplicitCastExpr(const ImplicitCastExpr *S) {
444   VisitCastExpr(S);
445   ID.AddInteger(S->getValueKind());
446 }
447 
448 void StmtProfiler::VisitExplicitCastExpr(const ExplicitCastExpr *S) {
449   VisitCastExpr(S);
450   VisitType(S->getTypeAsWritten());
451 }
452 
453 void StmtProfiler::VisitCStyleCastExpr(const CStyleCastExpr *S) {
454   VisitExplicitCastExpr(S);
455 }
456 
457 void StmtProfiler::VisitBinaryOperator(const BinaryOperator *S) {
458   VisitExpr(S);
459   ID.AddInteger(S->getOpcode());
460 }
461 
462 void
463 StmtProfiler::VisitCompoundAssignOperator(const CompoundAssignOperator *S) {
464   VisitBinaryOperator(S);
465 }
466 
467 void StmtProfiler::VisitConditionalOperator(const ConditionalOperator *S) {
468   VisitExpr(S);
469 }
470 
471 void StmtProfiler::VisitBinaryConditionalOperator(
472     const BinaryConditionalOperator *S) {
473   VisitExpr(S);
474 }
475 
476 void StmtProfiler::VisitAddrLabelExpr(const AddrLabelExpr *S) {
477   VisitExpr(S);
478   VisitDecl(S->getLabel());
479 }
480 
481 void StmtProfiler::VisitStmtExpr(const StmtExpr *S) {
482   VisitExpr(S);
483 }
484 
485 void StmtProfiler::VisitShuffleVectorExpr(const ShuffleVectorExpr *S) {
486   VisitExpr(S);
487 }
488 
489 void StmtProfiler::VisitConvertVectorExpr(const ConvertVectorExpr *S) {
490   VisitExpr(S);
491 }
492 
493 void StmtProfiler::VisitChooseExpr(const ChooseExpr *S) {
494   VisitExpr(S);
495 }
496 
497 void StmtProfiler::VisitGNUNullExpr(const GNUNullExpr *S) {
498   VisitExpr(S);
499 }
500 
501 void StmtProfiler::VisitVAArgExpr(const VAArgExpr *S) {
502   VisitExpr(S);
503 }
504 
505 void StmtProfiler::VisitInitListExpr(const InitListExpr *S) {
506   if (S->getSyntacticForm()) {
507     VisitInitListExpr(S->getSyntacticForm());
508     return;
509   }
510 
511   VisitExpr(S);
512 }
513 
514 void StmtProfiler::VisitDesignatedInitExpr(const DesignatedInitExpr *S) {
515   VisitExpr(S);
516   ID.AddBoolean(S->usesGNUSyntax());
517   for (DesignatedInitExpr::const_designators_iterator D =
518          S->designators_begin(), DEnd = S->designators_end();
519        D != DEnd; ++D) {
520     if (D->isFieldDesignator()) {
521       ID.AddInteger(0);
522       VisitName(D->getFieldName());
523       continue;
524     }
525 
526     if (D->isArrayDesignator()) {
527       ID.AddInteger(1);
528     } else {
529       assert(D->isArrayRangeDesignator());
530       ID.AddInteger(2);
531     }
532     ID.AddInteger(D->getFirstExprIndex());
533   }
534 }
535 
536 void StmtProfiler::VisitImplicitValueInitExpr(const ImplicitValueInitExpr *S) {
537   VisitExpr(S);
538 }
539 
540 void StmtProfiler::VisitExtVectorElementExpr(const ExtVectorElementExpr *S) {
541   VisitExpr(S);
542   VisitName(&S->getAccessor());
543 }
544 
545 void StmtProfiler::VisitBlockExpr(const BlockExpr *S) {
546   VisitExpr(S);
547   VisitDecl(S->getBlockDecl());
548 }
549 
550 void StmtProfiler::VisitGenericSelectionExpr(const GenericSelectionExpr *S) {
551   VisitExpr(S);
552   for (unsigned i = 0; i != S->getNumAssocs(); ++i) {
553     QualType T = S->getAssocType(i);
554     if (T.isNull())
555       ID.AddPointer(0);
556     else
557       VisitType(T);
558     VisitExpr(S->getAssocExpr(i));
559   }
560 }
561 
562 void StmtProfiler::VisitPseudoObjectExpr(const PseudoObjectExpr *S) {
563   VisitExpr(S);
564   for (PseudoObjectExpr::const_semantics_iterator
565          i = S->semantics_begin(), e = S->semantics_end(); i != e; ++i)
566     // Normally, we would not profile the source expressions of OVEs.
567     if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(*i))
568       Visit(OVE->getSourceExpr());
569 }
570 
571 void StmtProfiler::VisitAtomicExpr(const AtomicExpr *S) {
572   VisitExpr(S);
573   ID.AddInteger(S->getOp());
574 }
575 
576 static Stmt::StmtClass DecodeOperatorCall(const CXXOperatorCallExpr *S,
577                                           UnaryOperatorKind &UnaryOp,
578                                           BinaryOperatorKind &BinaryOp) {
579   switch (S->getOperator()) {
580   case OO_None:
581   case OO_New:
582   case OO_Delete:
583   case OO_Array_New:
584   case OO_Array_Delete:
585   case OO_Arrow:
586   case OO_Call:
587   case OO_Conditional:
588   case NUM_OVERLOADED_OPERATORS:
589     llvm_unreachable("Invalid operator call kind");
590 
591   case OO_Plus:
592     if (S->getNumArgs() == 1) {
593       UnaryOp = UO_Plus;
594       return Stmt::UnaryOperatorClass;
595     }
596 
597     BinaryOp = BO_Add;
598     return Stmt::BinaryOperatorClass;
599 
600   case OO_Minus:
601     if (S->getNumArgs() == 1) {
602       UnaryOp = UO_Minus;
603       return Stmt::UnaryOperatorClass;
604     }
605 
606     BinaryOp = BO_Sub;
607     return Stmt::BinaryOperatorClass;
608 
609   case OO_Star:
610     if (S->getNumArgs() == 1) {
611       UnaryOp = UO_Minus;
612       return Stmt::UnaryOperatorClass;
613     }
614 
615     BinaryOp = BO_Sub;
616     return Stmt::BinaryOperatorClass;
617 
618   case OO_Slash:
619     BinaryOp = BO_Div;
620     return Stmt::BinaryOperatorClass;
621 
622   case OO_Percent:
623     BinaryOp = BO_Rem;
624     return Stmt::BinaryOperatorClass;
625 
626   case OO_Caret:
627     BinaryOp = BO_Xor;
628     return Stmt::BinaryOperatorClass;
629 
630   case OO_Amp:
631     if (S->getNumArgs() == 1) {
632       UnaryOp = UO_AddrOf;
633       return Stmt::UnaryOperatorClass;
634     }
635 
636     BinaryOp = BO_And;
637     return Stmt::BinaryOperatorClass;
638 
639   case OO_Pipe:
640     BinaryOp = BO_Or;
641     return Stmt::BinaryOperatorClass;
642 
643   case OO_Tilde:
644     UnaryOp = UO_Not;
645     return Stmt::UnaryOperatorClass;
646 
647   case OO_Exclaim:
648     UnaryOp = UO_LNot;
649     return Stmt::UnaryOperatorClass;
650 
651   case OO_Equal:
652     BinaryOp = BO_Assign;
653     return Stmt::BinaryOperatorClass;
654 
655   case OO_Less:
656     BinaryOp = BO_LT;
657     return Stmt::BinaryOperatorClass;
658 
659   case OO_Greater:
660     BinaryOp = BO_GT;
661     return Stmt::BinaryOperatorClass;
662 
663   case OO_PlusEqual:
664     BinaryOp = BO_AddAssign;
665     return Stmt::CompoundAssignOperatorClass;
666 
667   case OO_MinusEqual:
668     BinaryOp = BO_SubAssign;
669     return Stmt::CompoundAssignOperatorClass;
670 
671   case OO_StarEqual:
672     BinaryOp = BO_MulAssign;
673     return Stmt::CompoundAssignOperatorClass;
674 
675   case OO_SlashEqual:
676     BinaryOp = BO_DivAssign;
677     return Stmt::CompoundAssignOperatorClass;
678 
679   case OO_PercentEqual:
680     BinaryOp = BO_RemAssign;
681     return Stmt::CompoundAssignOperatorClass;
682 
683   case OO_CaretEqual:
684     BinaryOp = BO_XorAssign;
685     return Stmt::CompoundAssignOperatorClass;
686 
687   case OO_AmpEqual:
688     BinaryOp = BO_AndAssign;
689     return Stmt::CompoundAssignOperatorClass;
690 
691   case OO_PipeEqual:
692     BinaryOp = BO_OrAssign;
693     return Stmt::CompoundAssignOperatorClass;
694 
695   case OO_LessLess:
696     BinaryOp = BO_Shl;
697     return Stmt::BinaryOperatorClass;
698 
699   case OO_GreaterGreater:
700     BinaryOp = BO_Shr;
701     return Stmt::BinaryOperatorClass;
702 
703   case OO_LessLessEqual:
704     BinaryOp = BO_ShlAssign;
705     return Stmt::CompoundAssignOperatorClass;
706 
707   case OO_GreaterGreaterEqual:
708     BinaryOp = BO_ShrAssign;
709     return Stmt::CompoundAssignOperatorClass;
710 
711   case OO_EqualEqual:
712     BinaryOp = BO_EQ;
713     return Stmt::BinaryOperatorClass;
714 
715   case OO_ExclaimEqual:
716     BinaryOp = BO_NE;
717     return Stmt::BinaryOperatorClass;
718 
719   case OO_LessEqual:
720     BinaryOp = BO_LE;
721     return Stmt::BinaryOperatorClass;
722 
723   case OO_GreaterEqual:
724     BinaryOp = BO_GE;
725     return Stmt::BinaryOperatorClass;
726 
727   case OO_AmpAmp:
728     BinaryOp = BO_LAnd;
729     return Stmt::BinaryOperatorClass;
730 
731   case OO_PipePipe:
732     BinaryOp = BO_LOr;
733     return Stmt::BinaryOperatorClass;
734 
735   case OO_PlusPlus:
736     UnaryOp = S->getNumArgs() == 1? UO_PreInc
737                                   : UO_PostInc;
738     return Stmt::UnaryOperatorClass;
739 
740   case OO_MinusMinus:
741     UnaryOp = S->getNumArgs() == 1? UO_PreDec
742                                   : UO_PostDec;
743     return Stmt::UnaryOperatorClass;
744 
745   case OO_Comma:
746     BinaryOp = BO_Comma;
747     return Stmt::BinaryOperatorClass;
748 
749 
750   case OO_ArrowStar:
751     BinaryOp = BO_PtrMemI;
752     return Stmt::BinaryOperatorClass;
753 
754   case OO_Subscript:
755     return Stmt::ArraySubscriptExprClass;
756   }
757 
758   llvm_unreachable("Invalid overloaded operator expression");
759 }
760 
761 
762 void StmtProfiler::VisitCXXOperatorCallExpr(const CXXOperatorCallExpr *S) {
763   if (S->isTypeDependent()) {
764     // Type-dependent operator calls are profiled like their underlying
765     // syntactic operator.
766     UnaryOperatorKind UnaryOp = UO_Extension;
767     BinaryOperatorKind BinaryOp = BO_Comma;
768     Stmt::StmtClass SC = DecodeOperatorCall(S, UnaryOp, BinaryOp);
769 
770     ID.AddInteger(SC);
771     for (unsigned I = 0, N = S->getNumArgs(); I != N; ++I)
772       Visit(S->getArg(I));
773     if (SC == Stmt::UnaryOperatorClass)
774       ID.AddInteger(UnaryOp);
775     else if (SC == Stmt::BinaryOperatorClass ||
776              SC == Stmt::CompoundAssignOperatorClass)
777       ID.AddInteger(BinaryOp);
778     else
779       assert(SC == Stmt::ArraySubscriptExprClass);
780 
781     return;
782   }
783 
784   VisitCallExpr(S);
785   ID.AddInteger(S->getOperator());
786 }
787 
788 void StmtProfiler::VisitCXXMemberCallExpr(const CXXMemberCallExpr *S) {
789   VisitCallExpr(S);
790 }
791 
792 void StmtProfiler::VisitCUDAKernelCallExpr(const CUDAKernelCallExpr *S) {
793   VisitCallExpr(S);
794 }
795 
796 void StmtProfiler::VisitAsTypeExpr(const AsTypeExpr *S) {
797   VisitExpr(S);
798 }
799 
800 void StmtProfiler::VisitCXXNamedCastExpr(const CXXNamedCastExpr *S) {
801   VisitExplicitCastExpr(S);
802 }
803 
804 void StmtProfiler::VisitCXXStaticCastExpr(const CXXStaticCastExpr *S) {
805   VisitCXXNamedCastExpr(S);
806 }
807 
808 void StmtProfiler::VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *S) {
809   VisitCXXNamedCastExpr(S);
810 }
811 
812 void
813 StmtProfiler::VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *S) {
814   VisitCXXNamedCastExpr(S);
815 }
816 
817 void StmtProfiler::VisitCXXConstCastExpr(const CXXConstCastExpr *S) {
818   VisitCXXNamedCastExpr(S);
819 }
820 
821 void StmtProfiler::VisitUserDefinedLiteral(const UserDefinedLiteral *S) {
822   VisitCallExpr(S);
823 }
824 
825 void StmtProfiler::VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *S) {
826   VisitExpr(S);
827   ID.AddBoolean(S->getValue());
828 }
829 
830 void StmtProfiler::VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *S) {
831   VisitExpr(S);
832 }
833 
834 void StmtProfiler::VisitCXXStdInitializerListExpr(
835     const CXXStdInitializerListExpr *S) {
836   VisitExpr(S);
837 }
838 
839 void StmtProfiler::VisitCXXTypeidExpr(const CXXTypeidExpr *S) {
840   VisitExpr(S);
841   if (S->isTypeOperand())
842     VisitType(S->getTypeOperandSourceInfo()->getType());
843 }
844 
845 void StmtProfiler::VisitCXXUuidofExpr(const CXXUuidofExpr *S) {
846   VisitExpr(S);
847   if (S->isTypeOperand())
848     VisitType(S->getTypeOperandSourceInfo()->getType());
849 }
850 
851 void StmtProfiler::VisitMSPropertyRefExpr(const MSPropertyRefExpr *S) {
852   VisitExpr(S);
853   VisitDecl(S->getPropertyDecl());
854 }
855 
856 void StmtProfiler::VisitCXXThisExpr(const CXXThisExpr *S) {
857   VisitExpr(S);
858   ID.AddBoolean(S->isImplicit());
859 }
860 
861 void StmtProfiler::VisitCXXThrowExpr(const CXXThrowExpr *S) {
862   VisitExpr(S);
863 }
864 
865 void StmtProfiler::VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *S) {
866   VisitExpr(S);
867   VisitDecl(S->getParam());
868 }
869 
870 void StmtProfiler::VisitCXXDefaultInitExpr(const CXXDefaultInitExpr *S) {
871   VisitExpr(S);
872   VisitDecl(S->getField());
873 }
874 
875 void StmtProfiler::VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *S) {
876   VisitExpr(S);
877   VisitDecl(
878          const_cast<CXXDestructorDecl *>(S->getTemporary()->getDestructor()));
879 }
880 
881 void StmtProfiler::VisitCXXConstructExpr(const CXXConstructExpr *S) {
882   VisitExpr(S);
883   VisitDecl(S->getConstructor());
884   ID.AddBoolean(S->isElidable());
885 }
886 
887 void StmtProfiler::VisitCXXFunctionalCastExpr(const CXXFunctionalCastExpr *S) {
888   VisitExplicitCastExpr(S);
889 }
890 
891 void
892 StmtProfiler::VisitCXXTemporaryObjectExpr(const CXXTemporaryObjectExpr *S) {
893   VisitCXXConstructExpr(S);
894 }
895 
896 void
897 StmtProfiler::VisitLambdaExpr(const LambdaExpr *S) {
898   VisitExpr(S);
899   for (LambdaExpr::capture_iterator C = S->explicit_capture_begin(),
900                                  CEnd = S->explicit_capture_end();
901        C != CEnd; ++C) {
902     ID.AddInteger(C->getCaptureKind());
903     switch (C->getCaptureKind()) {
904     case LCK_This:
905       break;
906     case LCK_ByRef:
907     case LCK_ByCopy:
908       VisitDecl(C->getCapturedVar());
909       ID.AddBoolean(C->isPackExpansion());
910       break;
911     }
912   }
913   // Note: If we actually needed to be able to match lambda
914   // expressions, we would have to consider parameters and return type
915   // here, among other things.
916   VisitStmt(S->getBody());
917 }
918 
919 void
920 StmtProfiler::VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *S) {
921   VisitExpr(S);
922 }
923 
924 void StmtProfiler::VisitCXXDeleteExpr(const CXXDeleteExpr *S) {
925   VisitExpr(S);
926   ID.AddBoolean(S->isGlobalDelete());
927   ID.AddBoolean(S->isArrayForm());
928   VisitDecl(S->getOperatorDelete());
929 }
930 
931 
932 void StmtProfiler::VisitCXXNewExpr(const CXXNewExpr *S) {
933   VisitExpr(S);
934   VisitType(S->getAllocatedType());
935   VisitDecl(S->getOperatorNew());
936   VisitDecl(S->getOperatorDelete());
937   ID.AddBoolean(S->isArray());
938   ID.AddInteger(S->getNumPlacementArgs());
939   ID.AddBoolean(S->isGlobalNew());
940   ID.AddBoolean(S->isParenTypeId());
941   ID.AddInteger(S->getInitializationStyle());
942 }
943 
944 void
945 StmtProfiler::VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *S) {
946   VisitExpr(S);
947   ID.AddBoolean(S->isArrow());
948   VisitNestedNameSpecifier(S->getQualifier());
949   ID.AddBoolean(S->getScopeTypeInfo() != 0);
950   if (S->getScopeTypeInfo())
951     VisitType(S->getScopeTypeInfo()->getType());
952   ID.AddBoolean(S->getDestroyedTypeInfo() != 0);
953   if (S->getDestroyedTypeInfo())
954     VisitType(S->getDestroyedType());
955   else
956     ID.AddPointer(S->getDestroyedTypeIdentifier());
957 }
958 
959 void StmtProfiler::VisitOverloadExpr(const OverloadExpr *S) {
960   VisitExpr(S);
961   VisitNestedNameSpecifier(S->getQualifier());
962   VisitName(S->getName());
963   ID.AddBoolean(S->hasExplicitTemplateArgs());
964   if (S->hasExplicitTemplateArgs())
965     VisitTemplateArguments(S->getExplicitTemplateArgs().getTemplateArgs(),
966                            S->getExplicitTemplateArgs().NumTemplateArgs);
967 }
968 
969 void
970 StmtProfiler::VisitUnresolvedLookupExpr(const UnresolvedLookupExpr *S) {
971   VisitOverloadExpr(S);
972 }
973 
974 void StmtProfiler::VisitTypeTraitExpr(const TypeTraitExpr *S) {
975   VisitExpr(S);
976   ID.AddInteger(S->getTrait());
977   ID.AddInteger(S->getNumArgs());
978   for (unsigned I = 0, N = S->getNumArgs(); I != N; ++I)
979     VisitType(S->getArg(I)->getType());
980 }
981 
982 void StmtProfiler::VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *S) {
983   VisitExpr(S);
984   ID.AddInteger(S->getTrait());
985   VisitType(S->getQueriedType());
986 }
987 
988 void StmtProfiler::VisitExpressionTraitExpr(const ExpressionTraitExpr *S) {
989   VisitExpr(S);
990   ID.AddInteger(S->getTrait());
991   VisitExpr(S->getQueriedExpression());
992 }
993 
994 void StmtProfiler::VisitDependentScopeDeclRefExpr(
995     const DependentScopeDeclRefExpr *S) {
996   VisitExpr(S);
997   VisitName(S->getDeclName());
998   VisitNestedNameSpecifier(S->getQualifier());
999   ID.AddBoolean(S->hasExplicitTemplateArgs());
1000   if (S->hasExplicitTemplateArgs())
1001     VisitTemplateArguments(S->getTemplateArgs(), S->getNumTemplateArgs());
1002 }
1003 
1004 void StmtProfiler::VisitExprWithCleanups(const ExprWithCleanups *S) {
1005   VisitExpr(S);
1006 }
1007 
1008 void StmtProfiler::VisitCXXUnresolvedConstructExpr(
1009     const CXXUnresolvedConstructExpr *S) {
1010   VisitExpr(S);
1011   VisitType(S->getTypeAsWritten());
1012 }
1013 
1014 void StmtProfiler::VisitCXXDependentScopeMemberExpr(
1015     const CXXDependentScopeMemberExpr *S) {
1016   ID.AddBoolean(S->isImplicitAccess());
1017   if (!S->isImplicitAccess()) {
1018     VisitExpr(S);
1019     ID.AddBoolean(S->isArrow());
1020   }
1021   VisitNestedNameSpecifier(S->getQualifier());
1022   VisitName(S->getMember());
1023   ID.AddBoolean(S->hasExplicitTemplateArgs());
1024   if (S->hasExplicitTemplateArgs())
1025     VisitTemplateArguments(S->getTemplateArgs(), S->getNumTemplateArgs());
1026 }
1027 
1028 void StmtProfiler::VisitUnresolvedMemberExpr(const UnresolvedMemberExpr *S) {
1029   ID.AddBoolean(S->isImplicitAccess());
1030   if (!S->isImplicitAccess()) {
1031     VisitExpr(S);
1032     ID.AddBoolean(S->isArrow());
1033   }
1034   VisitNestedNameSpecifier(S->getQualifier());
1035   VisitName(S->getMemberName());
1036   ID.AddBoolean(S->hasExplicitTemplateArgs());
1037   if (S->hasExplicitTemplateArgs())
1038     VisitTemplateArguments(S->getTemplateArgs(), S->getNumTemplateArgs());
1039 }
1040 
1041 void StmtProfiler::VisitCXXNoexceptExpr(const CXXNoexceptExpr *S) {
1042   VisitExpr(S);
1043 }
1044 
1045 void StmtProfiler::VisitPackExpansionExpr(const PackExpansionExpr *S) {
1046   VisitExpr(S);
1047 }
1048 
1049 void StmtProfiler::VisitSizeOfPackExpr(const SizeOfPackExpr *S) {
1050   VisitExpr(S);
1051   VisitDecl(S->getPack());
1052 }
1053 
1054 void StmtProfiler::VisitSubstNonTypeTemplateParmPackExpr(
1055     const SubstNonTypeTemplateParmPackExpr *S) {
1056   VisitExpr(S);
1057   VisitDecl(S->getParameterPack());
1058   VisitTemplateArgument(S->getArgumentPack());
1059 }
1060 
1061 void StmtProfiler::VisitSubstNonTypeTemplateParmExpr(
1062     const SubstNonTypeTemplateParmExpr *E) {
1063   // Profile exactly as the replacement expression.
1064   Visit(E->getReplacement());
1065 }
1066 
1067 void StmtProfiler::VisitFunctionParmPackExpr(const FunctionParmPackExpr *S) {
1068   VisitExpr(S);
1069   VisitDecl(S->getParameterPack());
1070   ID.AddInteger(S->getNumExpansions());
1071   for (FunctionParmPackExpr::iterator I = S->begin(), E = S->end(); I != E; ++I)
1072     VisitDecl(*I);
1073 }
1074 
1075 void StmtProfiler::VisitMaterializeTemporaryExpr(
1076                                            const MaterializeTemporaryExpr *S) {
1077   VisitExpr(S);
1078 }
1079 
1080 void StmtProfiler::VisitOpaqueValueExpr(const OpaqueValueExpr *E) {
1081   VisitExpr(E);
1082 }
1083 
1084 void StmtProfiler::VisitObjCStringLiteral(const ObjCStringLiteral *S) {
1085   VisitExpr(S);
1086 }
1087 
1088 void StmtProfiler::VisitObjCBoxedExpr(const ObjCBoxedExpr *E) {
1089   VisitExpr(E);
1090 }
1091 
1092 void StmtProfiler::VisitObjCArrayLiteral(const ObjCArrayLiteral *E) {
1093   VisitExpr(E);
1094 }
1095 
1096 void StmtProfiler::VisitObjCDictionaryLiteral(const ObjCDictionaryLiteral *E) {
1097   VisitExpr(E);
1098 }
1099 
1100 void StmtProfiler::VisitObjCEncodeExpr(const ObjCEncodeExpr *S) {
1101   VisitExpr(S);
1102   VisitType(S->getEncodedType());
1103 }
1104 
1105 void StmtProfiler::VisitObjCSelectorExpr(const ObjCSelectorExpr *S) {
1106   VisitExpr(S);
1107   VisitName(S->getSelector());
1108 }
1109 
1110 void StmtProfiler::VisitObjCProtocolExpr(const ObjCProtocolExpr *S) {
1111   VisitExpr(S);
1112   VisitDecl(S->getProtocol());
1113 }
1114 
1115 void StmtProfiler::VisitObjCIvarRefExpr(const ObjCIvarRefExpr *S) {
1116   VisitExpr(S);
1117   VisitDecl(S->getDecl());
1118   ID.AddBoolean(S->isArrow());
1119   ID.AddBoolean(S->isFreeIvar());
1120 }
1121 
1122 void StmtProfiler::VisitObjCPropertyRefExpr(const ObjCPropertyRefExpr *S) {
1123   VisitExpr(S);
1124   if (S->isImplicitProperty()) {
1125     VisitDecl(S->getImplicitPropertyGetter());
1126     VisitDecl(S->getImplicitPropertySetter());
1127   } else {
1128     VisitDecl(S->getExplicitProperty());
1129   }
1130   if (S->isSuperReceiver()) {
1131     ID.AddBoolean(S->isSuperReceiver());
1132     VisitType(S->getSuperReceiverType());
1133   }
1134 }
1135 
1136 void StmtProfiler::VisitObjCSubscriptRefExpr(const ObjCSubscriptRefExpr *S) {
1137   VisitExpr(S);
1138   VisitDecl(S->getAtIndexMethodDecl());
1139   VisitDecl(S->setAtIndexMethodDecl());
1140 }
1141 
1142 void StmtProfiler::VisitObjCMessageExpr(const ObjCMessageExpr *S) {
1143   VisitExpr(S);
1144   VisitName(S->getSelector());
1145   VisitDecl(S->getMethodDecl());
1146 }
1147 
1148 void StmtProfiler::VisitObjCIsaExpr(const ObjCIsaExpr *S) {
1149   VisitExpr(S);
1150   ID.AddBoolean(S->isArrow());
1151 }
1152 
1153 void StmtProfiler::VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *S) {
1154   VisitExpr(S);
1155   ID.AddBoolean(S->getValue());
1156 }
1157 
1158 void StmtProfiler::VisitObjCIndirectCopyRestoreExpr(
1159     const ObjCIndirectCopyRestoreExpr *S) {
1160   VisitExpr(S);
1161   ID.AddBoolean(S->shouldCopy());
1162 }
1163 
1164 void StmtProfiler::VisitObjCBridgedCastExpr(const ObjCBridgedCastExpr *S) {
1165   VisitExplicitCastExpr(S);
1166   ID.AddBoolean(S->getBridgeKind());
1167 }
1168 
1169 void StmtProfiler::VisitDecl(const Decl *D) {
1170   ID.AddInteger(D? D->getKind() : 0);
1171 
1172   if (Canonical && D) {
1173     if (const NonTypeTemplateParmDecl *NTTP =
1174           dyn_cast<NonTypeTemplateParmDecl>(D)) {
1175       ID.AddInteger(NTTP->getDepth());
1176       ID.AddInteger(NTTP->getIndex());
1177       ID.AddBoolean(NTTP->isParameterPack());
1178       VisitType(NTTP->getType());
1179       return;
1180     }
1181 
1182     if (const ParmVarDecl *Parm = dyn_cast<ParmVarDecl>(D)) {
1183       // The Itanium C++ ABI uses the type, scope depth, and scope
1184       // index of a parameter when mangling expressions that involve
1185       // function parameters, so we will use the parameter's type for
1186       // establishing function parameter identity. That way, our
1187       // definition of "equivalent" (per C++ [temp.over.link]) is at
1188       // least as strong as the definition of "equivalent" used for
1189       // name mangling.
1190       VisitType(Parm->getType());
1191       ID.AddInteger(Parm->getFunctionScopeDepth());
1192       ID.AddInteger(Parm->getFunctionScopeIndex());
1193       return;
1194     }
1195 
1196     if (const TemplateTypeParmDecl *TTP =
1197           dyn_cast<TemplateTypeParmDecl>(D)) {
1198       ID.AddInteger(TTP->getDepth());
1199       ID.AddInteger(TTP->getIndex());
1200       ID.AddBoolean(TTP->isParameterPack());
1201       return;
1202     }
1203 
1204     if (const TemplateTemplateParmDecl *TTP =
1205           dyn_cast<TemplateTemplateParmDecl>(D)) {
1206       ID.AddInteger(TTP->getDepth());
1207       ID.AddInteger(TTP->getIndex());
1208       ID.AddBoolean(TTP->isParameterPack());
1209       return;
1210     }
1211   }
1212 
1213   ID.AddPointer(D? D->getCanonicalDecl() : 0);
1214 }
1215 
1216 void StmtProfiler::VisitType(QualType T) {
1217   if (Canonical)
1218     T = Context.getCanonicalType(T);
1219 
1220   ID.AddPointer(T.getAsOpaquePtr());
1221 }
1222 
1223 void StmtProfiler::VisitName(DeclarationName Name) {
1224   ID.AddPointer(Name.getAsOpaquePtr());
1225 }
1226 
1227 void StmtProfiler::VisitNestedNameSpecifier(NestedNameSpecifier *NNS) {
1228   if (Canonical)
1229     NNS = Context.getCanonicalNestedNameSpecifier(NNS);
1230   ID.AddPointer(NNS);
1231 }
1232 
1233 void StmtProfiler::VisitTemplateName(TemplateName Name) {
1234   if (Canonical)
1235     Name = Context.getCanonicalTemplateName(Name);
1236 
1237   Name.Profile(ID);
1238 }
1239 
1240 void StmtProfiler::VisitTemplateArguments(const TemplateArgumentLoc *Args,
1241                                           unsigned NumArgs) {
1242   ID.AddInteger(NumArgs);
1243   for (unsigned I = 0; I != NumArgs; ++I)
1244     VisitTemplateArgument(Args[I].getArgument());
1245 }
1246 
1247 void StmtProfiler::VisitTemplateArgument(const TemplateArgument &Arg) {
1248   // Mostly repetitive with TemplateArgument::Profile!
1249   ID.AddInteger(Arg.getKind());
1250   switch (Arg.getKind()) {
1251   case TemplateArgument::Null:
1252     break;
1253 
1254   case TemplateArgument::Type:
1255     VisitType(Arg.getAsType());
1256     break;
1257 
1258   case TemplateArgument::Template:
1259   case TemplateArgument::TemplateExpansion:
1260     VisitTemplateName(Arg.getAsTemplateOrTemplatePattern());
1261     break;
1262 
1263   case TemplateArgument::Declaration:
1264     VisitDecl(Arg.getAsDecl());
1265     break;
1266 
1267   case TemplateArgument::NullPtr:
1268     VisitType(Arg.getNullPtrType());
1269     break;
1270 
1271   case TemplateArgument::Integral:
1272     Arg.getAsIntegral().Profile(ID);
1273     VisitType(Arg.getIntegralType());
1274     break;
1275 
1276   case TemplateArgument::Expression:
1277     Visit(Arg.getAsExpr());
1278     break;
1279 
1280   case TemplateArgument::Pack:
1281     const TemplateArgument *Pack = Arg.pack_begin();
1282     for (unsigned i = 0, e = Arg.pack_size(); i != e; ++i)
1283       VisitTemplateArgument(Pack[i]);
1284     break;
1285   }
1286 }
1287 
1288 void Stmt::Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
1289                    bool Canonical) const {
1290   StmtProfiler Profiler(ID, Context, Canonical);
1291   Profiler.Visit(this);
1292 }
1293