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/ExprOpenMP.h"
22 #include "clang/AST/StmtVisitor.h"
23 #include "llvm/ADT/FoldingSet.h"
24 using namespace clang;
25 
26 namespace {
27   class StmtProfiler : public ConstStmtVisitor<StmtProfiler> {
28     llvm::FoldingSetNodeID &ID;
29     const ASTContext &Context;
30     bool Canonical;
31 
32   public:
33     StmtProfiler(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
34                  bool Canonical)
35       : ID(ID), Context(Context), Canonical(Canonical) { }
36 
37     void VisitStmt(const Stmt *S);
38 
39 #define STMT(Node, Base) void Visit##Node(const Node *S);
40 #include "clang/AST/StmtNodes.inc"
41 
42     /// \brief Visit a declaration that is referenced within an expression
43     /// or statement.
44     void VisitDecl(const Decl *D);
45 
46     /// \brief Visit a type that is referenced within an expression or
47     /// statement.
48     void VisitType(QualType T);
49 
50     /// \brief Visit a name that occurs within an expression or statement.
51     void VisitName(DeclarationName Name);
52 
53     /// \brief Visit a nested-name-specifier that occurs within an expression
54     /// or statement.
55     void VisitNestedNameSpecifier(NestedNameSpecifier *NNS);
56 
57     /// \brief Visit a template name that occurs within an expression or
58     /// statement.
59     void VisitTemplateName(TemplateName Name);
60 
61     /// \brief Visit template arguments that occur within an expression or
62     /// statement.
63     void VisitTemplateArguments(const TemplateArgumentLoc *Args,
64                                 unsigned NumArgs);
65 
66     /// \brief Visit a single template argument.
67     void VisitTemplateArgument(const TemplateArgument &Arg);
68   };
69 }
70 
71 void StmtProfiler::VisitStmt(const Stmt *S) {
72   ID.AddInteger(S->getStmtClass());
73   for (const Stmt *SubStmt : S->children()) {
74     if (SubStmt)
75       Visit(SubStmt);
76     else
77       ID.AddInteger(0);
78   }
79 }
80 
81 void StmtProfiler::VisitDeclStmt(const DeclStmt *S) {
82   VisitStmt(S);
83   for (const auto *D : S->decls())
84     VisitDecl(D);
85 }
86 
87 void StmtProfiler::VisitNullStmt(const NullStmt *S) {
88   VisitStmt(S);
89 }
90 
91 void StmtProfiler::VisitCompoundStmt(const CompoundStmt *S) {
92   VisitStmt(S);
93 }
94 
95 void StmtProfiler::VisitSwitchCase(const SwitchCase *S) {
96   VisitStmt(S);
97 }
98 
99 void StmtProfiler::VisitCaseStmt(const CaseStmt *S) {
100   VisitStmt(S);
101 }
102 
103 void StmtProfiler::VisitDefaultStmt(const DefaultStmt *S) {
104   VisitStmt(S);
105 }
106 
107 void StmtProfiler::VisitLabelStmt(const LabelStmt *S) {
108   VisitStmt(S);
109   VisitDecl(S->getDecl());
110 }
111 
112 void StmtProfiler::VisitAttributedStmt(const AttributedStmt *S) {
113   VisitStmt(S);
114   // TODO: maybe visit attributes?
115 }
116 
117 void StmtProfiler::VisitIfStmt(const IfStmt *S) {
118   VisitStmt(S);
119   VisitDecl(S->getConditionVariable());
120 }
121 
122 void StmtProfiler::VisitSwitchStmt(const SwitchStmt *S) {
123   VisitStmt(S);
124   VisitDecl(S->getConditionVariable());
125 }
126 
127 void StmtProfiler::VisitWhileStmt(const WhileStmt *S) {
128   VisitStmt(S);
129   VisitDecl(S->getConditionVariable());
130 }
131 
132 void StmtProfiler::VisitDoStmt(const DoStmt *S) {
133   VisitStmt(S);
134 }
135 
136 void StmtProfiler::VisitForStmt(const ForStmt *S) {
137   VisitStmt(S);
138 }
139 
140 void StmtProfiler::VisitGotoStmt(const GotoStmt *S) {
141   VisitStmt(S);
142   VisitDecl(S->getLabel());
143 }
144 
145 void StmtProfiler::VisitIndirectGotoStmt(const IndirectGotoStmt *S) {
146   VisitStmt(S);
147 }
148 
149 void StmtProfiler::VisitContinueStmt(const ContinueStmt *S) {
150   VisitStmt(S);
151 }
152 
153 void StmtProfiler::VisitBreakStmt(const BreakStmt *S) {
154   VisitStmt(S);
155 }
156 
157 void StmtProfiler::VisitReturnStmt(const ReturnStmt *S) {
158   VisitStmt(S);
159 }
160 
161 void StmtProfiler::VisitGCCAsmStmt(const GCCAsmStmt *S) {
162   VisitStmt(S);
163   ID.AddBoolean(S->isVolatile());
164   ID.AddBoolean(S->isSimple());
165   VisitStringLiteral(S->getAsmString());
166   ID.AddInteger(S->getNumOutputs());
167   for (unsigned I = 0, N = S->getNumOutputs(); I != N; ++I) {
168     ID.AddString(S->getOutputName(I));
169     VisitStringLiteral(S->getOutputConstraintLiteral(I));
170   }
171   ID.AddInteger(S->getNumInputs());
172   for (unsigned I = 0, N = S->getNumInputs(); I != N; ++I) {
173     ID.AddString(S->getInputName(I));
174     VisitStringLiteral(S->getInputConstraintLiteral(I));
175   }
176   ID.AddInteger(S->getNumClobbers());
177   for (unsigned I = 0, N = S->getNumClobbers(); I != N; ++I)
178     VisitStringLiteral(S->getClobberStringLiteral(I));
179 }
180 
181 void StmtProfiler::VisitMSAsmStmt(const MSAsmStmt *S) {
182   // FIXME: Implement MS style inline asm statement profiler.
183   VisitStmt(S);
184 }
185 
186 void StmtProfiler::VisitCXXCatchStmt(const CXXCatchStmt *S) {
187   VisitStmt(S);
188   VisitType(S->getCaughtType());
189 }
190 
191 void StmtProfiler::VisitCXXTryStmt(const CXXTryStmt *S) {
192   VisitStmt(S);
193 }
194 
195 void StmtProfiler::VisitCXXForRangeStmt(const CXXForRangeStmt *S) {
196   VisitStmt(S);
197 }
198 
199 void StmtProfiler::VisitMSDependentExistsStmt(const MSDependentExistsStmt *S) {
200   VisitStmt(S);
201   ID.AddBoolean(S->isIfExists());
202   VisitNestedNameSpecifier(S->getQualifierLoc().getNestedNameSpecifier());
203   VisitName(S->getNameInfo().getName());
204 }
205 
206 void StmtProfiler::VisitSEHTryStmt(const SEHTryStmt *S) {
207   VisitStmt(S);
208 }
209 
210 void StmtProfiler::VisitSEHFinallyStmt(const SEHFinallyStmt *S) {
211   VisitStmt(S);
212 }
213 
214 void StmtProfiler::VisitSEHExceptStmt(const SEHExceptStmt *S) {
215   VisitStmt(S);
216 }
217 
218 void StmtProfiler::VisitSEHLeaveStmt(const SEHLeaveStmt *S) {
219   VisitStmt(S);
220 }
221 
222 void StmtProfiler::VisitCapturedStmt(const CapturedStmt *S) {
223   VisitStmt(S);
224 }
225 
226 void StmtProfiler::VisitObjCForCollectionStmt(const ObjCForCollectionStmt *S) {
227   VisitStmt(S);
228 }
229 
230 void StmtProfiler::VisitObjCAtCatchStmt(const ObjCAtCatchStmt *S) {
231   VisitStmt(S);
232   ID.AddBoolean(S->hasEllipsis());
233   if (S->getCatchParamDecl())
234     VisitType(S->getCatchParamDecl()->getType());
235 }
236 
237 void StmtProfiler::VisitObjCAtFinallyStmt(const ObjCAtFinallyStmt *S) {
238   VisitStmt(S);
239 }
240 
241 void StmtProfiler::VisitObjCAtTryStmt(const ObjCAtTryStmt *S) {
242   VisitStmt(S);
243 }
244 
245 void
246 StmtProfiler::VisitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt *S) {
247   VisitStmt(S);
248 }
249 
250 void StmtProfiler::VisitObjCAtThrowStmt(const ObjCAtThrowStmt *S) {
251   VisitStmt(S);
252 }
253 
254 void
255 StmtProfiler::VisitObjCAutoreleasePoolStmt(const ObjCAutoreleasePoolStmt *S) {
256   VisitStmt(S);
257 }
258 
259 namespace {
260 class OMPClauseProfiler : public ConstOMPClauseVisitor<OMPClauseProfiler> {
261   StmtProfiler *Profiler;
262   /// \brief Process clauses with list of variables.
263   template <typename T>
264   void VisitOMPClauseList(T *Node);
265 public:
266   OMPClauseProfiler(StmtProfiler *P) : Profiler(P) { }
267 #define OPENMP_CLAUSE(Name, Class)                                             \
268   void Visit##Class(const Class *C);
269 #include "clang/Basic/OpenMPKinds.def"
270 };
271 
272 void OMPClauseProfiler::VisitOMPIfClause(const OMPIfClause *C) {
273   if (C->getCondition())
274     Profiler->VisitStmt(C->getCondition());
275 }
276 
277 void OMPClauseProfiler::VisitOMPFinalClause(const OMPFinalClause *C) {
278   if (C->getCondition())
279     Profiler->VisitStmt(C->getCondition());
280 }
281 
282 void OMPClauseProfiler::VisitOMPNumThreadsClause(const OMPNumThreadsClause *C) {
283   if (C->getNumThreads())
284     Profiler->VisitStmt(C->getNumThreads());
285 }
286 
287 void OMPClauseProfiler::VisitOMPSafelenClause(const OMPSafelenClause *C) {
288   if (C->getSafelen())
289     Profiler->VisitStmt(C->getSafelen());
290 }
291 
292 void OMPClauseProfiler::VisitOMPSimdlenClause(const OMPSimdlenClause *C) {
293   if (C->getSimdlen())
294     Profiler->VisitStmt(C->getSimdlen());
295 }
296 
297 void OMPClauseProfiler::VisitOMPCollapseClause(const OMPCollapseClause *C) {
298   if (C->getNumForLoops())
299     Profiler->VisitStmt(C->getNumForLoops());
300 }
301 
302 void OMPClauseProfiler::VisitOMPDefaultClause(const OMPDefaultClause *C) { }
303 
304 void OMPClauseProfiler::VisitOMPProcBindClause(const OMPProcBindClause *C) { }
305 
306 void OMPClauseProfiler::VisitOMPScheduleClause(const OMPScheduleClause *C) {
307   if (C->getChunkSize()) {
308     Profiler->VisitStmt(C->getChunkSize());
309     if (C->getHelperChunkSize()) {
310       Profiler->VisitStmt(C->getChunkSize());
311     }
312   }
313 }
314 
315 void OMPClauseProfiler::VisitOMPOrderedClause(const OMPOrderedClause *C) {
316   if (auto *Num = C->getNumForLoops())
317     Profiler->VisitStmt(Num);
318 }
319 
320 void OMPClauseProfiler::VisitOMPNowaitClause(const OMPNowaitClause *) {}
321 
322 void OMPClauseProfiler::VisitOMPUntiedClause(const OMPUntiedClause *) {}
323 
324 void OMPClauseProfiler::VisitOMPMergeableClause(const OMPMergeableClause *) {}
325 
326 void OMPClauseProfiler::VisitOMPReadClause(const OMPReadClause *) {}
327 
328 void OMPClauseProfiler::VisitOMPWriteClause(const OMPWriteClause *) {}
329 
330 void OMPClauseProfiler::VisitOMPUpdateClause(const OMPUpdateClause *) {}
331 
332 void OMPClauseProfiler::VisitOMPCaptureClause(const OMPCaptureClause *) {}
333 
334 void OMPClauseProfiler::VisitOMPSeqCstClause(const OMPSeqCstClause *) {}
335 
336 void OMPClauseProfiler::VisitOMPThreadsClause(const OMPThreadsClause *) {}
337 
338 void OMPClauseProfiler::VisitOMPSIMDClause(const OMPSIMDClause *) {}
339 
340 template<typename T>
341 void OMPClauseProfiler::VisitOMPClauseList(T *Node) {
342   for (auto *E : Node->varlists()) {
343     Profiler->VisitStmt(E);
344   }
345 }
346 
347 void OMPClauseProfiler::VisitOMPPrivateClause(const OMPPrivateClause *C) {
348   VisitOMPClauseList(C);
349   for (auto *E : C->private_copies()) {
350     Profiler->VisitStmt(E);
351   }
352 }
353 void
354 OMPClauseProfiler::VisitOMPFirstprivateClause(const OMPFirstprivateClause *C) {
355   VisitOMPClauseList(C);
356   for (auto *E : C->private_copies()) {
357     Profiler->VisitStmt(E);
358   }
359   for (auto *E : C->inits()) {
360     Profiler->VisitStmt(E);
361   }
362 }
363 void
364 OMPClauseProfiler::VisitOMPLastprivateClause(const OMPLastprivateClause *C) {
365   VisitOMPClauseList(C);
366   for (auto *E : C->source_exprs()) {
367     Profiler->VisitStmt(E);
368   }
369   for (auto *E : C->destination_exprs()) {
370     Profiler->VisitStmt(E);
371   }
372   for (auto *E : C->assignment_ops()) {
373     Profiler->VisitStmt(E);
374   }
375 }
376 void OMPClauseProfiler::VisitOMPSharedClause(const OMPSharedClause *C) {
377   VisitOMPClauseList(C);
378 }
379 void OMPClauseProfiler::VisitOMPReductionClause(
380                                          const OMPReductionClause *C) {
381   Profiler->VisitNestedNameSpecifier(
382       C->getQualifierLoc().getNestedNameSpecifier());
383   Profiler->VisitName(C->getNameInfo().getName());
384   VisitOMPClauseList(C);
385   for (auto *E : C->privates()) {
386     Profiler->VisitStmt(E);
387   }
388   for (auto *E : C->lhs_exprs()) {
389     Profiler->VisitStmt(E);
390   }
391   for (auto *E : C->rhs_exprs()) {
392     Profiler->VisitStmt(E);
393   }
394   for (auto *E : C->reduction_ops()) {
395     Profiler->VisitStmt(E);
396   }
397 }
398 void OMPClauseProfiler::VisitOMPLinearClause(const OMPLinearClause *C) {
399   VisitOMPClauseList(C);
400   for (auto *E : C->privates()) {
401     Profiler->VisitStmt(E);
402   }
403   for (auto *E : C->inits()) {
404     Profiler->VisitStmt(E);
405   }
406   for (auto *E : C->updates()) {
407     Profiler->VisitStmt(E);
408   }
409   for (auto *E : C->finals()) {
410     Profiler->VisitStmt(E);
411   }
412   Profiler->VisitStmt(C->getStep());
413   Profiler->VisitStmt(C->getCalcStep());
414 }
415 void OMPClauseProfiler::VisitOMPAlignedClause(const OMPAlignedClause *C) {
416   VisitOMPClauseList(C);
417   Profiler->VisitStmt(C->getAlignment());
418 }
419 void OMPClauseProfiler::VisitOMPCopyinClause(const OMPCopyinClause *C) {
420   VisitOMPClauseList(C);
421   for (auto *E : C->source_exprs()) {
422     Profiler->VisitStmt(E);
423   }
424   for (auto *E : C->destination_exprs()) {
425     Profiler->VisitStmt(E);
426   }
427   for (auto *E : C->assignment_ops()) {
428     Profiler->VisitStmt(E);
429   }
430 }
431 void
432 OMPClauseProfiler::VisitOMPCopyprivateClause(const OMPCopyprivateClause *C) {
433   VisitOMPClauseList(C);
434   for (auto *E : C->source_exprs()) {
435     Profiler->VisitStmt(E);
436   }
437   for (auto *E : C->destination_exprs()) {
438     Profiler->VisitStmt(E);
439   }
440   for (auto *E : C->assignment_ops()) {
441     Profiler->VisitStmt(E);
442   }
443 }
444 void OMPClauseProfiler::VisitOMPFlushClause(const OMPFlushClause *C) {
445   VisitOMPClauseList(C);
446 }
447 void OMPClauseProfiler::VisitOMPDependClause(const OMPDependClause *C) {
448   VisitOMPClauseList(C);
449 }
450 void OMPClauseProfiler::VisitOMPDeviceClause(const OMPDeviceClause *C) {
451   Profiler->VisitStmt(C->getDevice());
452 }
453 }
454 
455 void
456 StmtProfiler::VisitOMPExecutableDirective(const OMPExecutableDirective *S) {
457   VisitStmt(S);
458   OMPClauseProfiler P(this);
459   ArrayRef<OMPClause *> Clauses = S->clauses();
460   for (ArrayRef<OMPClause *>::iterator I = Clauses.begin(), E = Clauses.end();
461        I != E; ++I)
462     if (*I)
463       P.Visit(*I);
464 }
465 
466 void StmtProfiler::VisitOMPLoopDirective(const OMPLoopDirective *S) {
467   VisitOMPExecutableDirective(S);
468 }
469 
470 void StmtProfiler::VisitOMPParallelDirective(const OMPParallelDirective *S) {
471   VisitOMPExecutableDirective(S);
472 }
473 
474 void StmtProfiler::VisitOMPSimdDirective(const OMPSimdDirective *S) {
475   VisitOMPLoopDirective(S);
476 }
477 
478 void StmtProfiler::VisitOMPForDirective(const OMPForDirective *S) {
479   VisitOMPLoopDirective(S);
480 }
481 
482 void StmtProfiler::VisitOMPForSimdDirective(const OMPForSimdDirective *S) {
483   VisitOMPLoopDirective(S);
484 }
485 
486 void StmtProfiler::VisitOMPSectionsDirective(const OMPSectionsDirective *S) {
487   VisitOMPExecutableDirective(S);
488 }
489 
490 void StmtProfiler::VisitOMPSectionDirective(const OMPSectionDirective *S) {
491   VisitOMPExecutableDirective(S);
492 }
493 
494 void StmtProfiler::VisitOMPSingleDirective(const OMPSingleDirective *S) {
495   VisitOMPExecutableDirective(S);
496 }
497 
498 void StmtProfiler::VisitOMPMasterDirective(const OMPMasterDirective *S) {
499   VisitOMPExecutableDirective(S);
500 }
501 
502 void StmtProfiler::VisitOMPCriticalDirective(const OMPCriticalDirective *S) {
503   VisitOMPExecutableDirective(S);
504   VisitName(S->getDirectiveName().getName());
505 }
506 
507 void
508 StmtProfiler::VisitOMPParallelForDirective(const OMPParallelForDirective *S) {
509   VisitOMPLoopDirective(S);
510 }
511 
512 void StmtProfiler::VisitOMPParallelForSimdDirective(
513     const OMPParallelForSimdDirective *S) {
514   VisitOMPLoopDirective(S);
515 }
516 
517 void StmtProfiler::VisitOMPParallelSectionsDirective(
518     const OMPParallelSectionsDirective *S) {
519   VisitOMPExecutableDirective(S);
520 }
521 
522 void StmtProfiler::VisitOMPTaskDirective(const OMPTaskDirective *S) {
523   VisitOMPExecutableDirective(S);
524 }
525 
526 void StmtProfiler::VisitOMPTaskyieldDirective(const OMPTaskyieldDirective *S) {
527   VisitOMPExecutableDirective(S);
528 }
529 
530 void StmtProfiler::VisitOMPBarrierDirective(const OMPBarrierDirective *S) {
531   VisitOMPExecutableDirective(S);
532 }
533 
534 void StmtProfiler::VisitOMPTaskwaitDirective(const OMPTaskwaitDirective *S) {
535   VisitOMPExecutableDirective(S);
536 }
537 
538 void StmtProfiler::VisitOMPTaskgroupDirective(const OMPTaskgroupDirective *S) {
539   VisitOMPExecutableDirective(S);
540 }
541 
542 void StmtProfiler::VisitOMPFlushDirective(const OMPFlushDirective *S) {
543   VisitOMPExecutableDirective(S);
544 }
545 
546 void StmtProfiler::VisitOMPOrderedDirective(const OMPOrderedDirective *S) {
547   VisitOMPExecutableDirective(S);
548 }
549 
550 void StmtProfiler::VisitOMPAtomicDirective(const OMPAtomicDirective *S) {
551   VisitOMPExecutableDirective(S);
552 }
553 
554 void StmtProfiler::VisitOMPTargetDirective(const OMPTargetDirective *S) {
555   VisitOMPExecutableDirective(S);
556 }
557 
558 void StmtProfiler::VisitOMPTargetDataDirective(const OMPTargetDataDirective *S) {
559   VisitOMPExecutableDirective(S);
560 }
561 
562 void StmtProfiler::VisitOMPTeamsDirective(const OMPTeamsDirective *S) {
563   VisitOMPExecutableDirective(S);
564 }
565 
566 void StmtProfiler::VisitOMPCancellationPointDirective(
567     const OMPCancellationPointDirective *S) {
568   VisitOMPExecutableDirective(S);
569 }
570 
571 void StmtProfiler::VisitOMPCancelDirective(const OMPCancelDirective *S) {
572   VisitOMPExecutableDirective(S);
573 }
574 
575 void StmtProfiler::VisitExpr(const Expr *S) {
576   VisitStmt(S);
577 }
578 
579 void StmtProfiler::VisitDeclRefExpr(const DeclRefExpr *S) {
580   VisitExpr(S);
581   if (!Canonical)
582     VisitNestedNameSpecifier(S->getQualifier());
583   VisitDecl(S->getDecl());
584   if (!Canonical)
585     VisitTemplateArguments(S->getTemplateArgs(), S->getNumTemplateArgs());
586 }
587 
588 void StmtProfiler::VisitPredefinedExpr(const PredefinedExpr *S) {
589   VisitExpr(S);
590   ID.AddInteger(S->getIdentType());
591 }
592 
593 void StmtProfiler::VisitIntegerLiteral(const IntegerLiteral *S) {
594   VisitExpr(S);
595   S->getValue().Profile(ID);
596   ID.AddInteger(S->getType()->castAs<BuiltinType>()->getKind());
597 }
598 
599 void StmtProfiler::VisitCharacterLiteral(const CharacterLiteral *S) {
600   VisitExpr(S);
601   ID.AddInteger(S->getKind());
602   ID.AddInteger(S->getValue());
603 }
604 
605 void StmtProfiler::VisitFloatingLiteral(const FloatingLiteral *S) {
606   VisitExpr(S);
607   S->getValue().Profile(ID);
608   ID.AddBoolean(S->isExact());
609   ID.AddInteger(S->getType()->castAs<BuiltinType>()->getKind());
610 }
611 
612 void StmtProfiler::VisitImaginaryLiteral(const ImaginaryLiteral *S) {
613   VisitExpr(S);
614 }
615 
616 void StmtProfiler::VisitStringLiteral(const StringLiteral *S) {
617   VisitExpr(S);
618   ID.AddString(S->getBytes());
619   ID.AddInteger(S->getKind());
620 }
621 
622 void StmtProfiler::VisitParenExpr(const ParenExpr *S) {
623   VisitExpr(S);
624 }
625 
626 void StmtProfiler::VisitParenListExpr(const ParenListExpr *S) {
627   VisitExpr(S);
628 }
629 
630 void StmtProfiler::VisitUnaryOperator(const UnaryOperator *S) {
631   VisitExpr(S);
632   ID.AddInteger(S->getOpcode());
633 }
634 
635 void StmtProfiler::VisitOffsetOfExpr(const OffsetOfExpr *S) {
636   VisitType(S->getTypeSourceInfo()->getType());
637   unsigned n = S->getNumComponents();
638   for (unsigned i = 0; i < n; ++i) {
639     const OffsetOfExpr::OffsetOfNode& ON = S->getComponent(i);
640     ID.AddInteger(ON.getKind());
641     switch (ON.getKind()) {
642     case OffsetOfExpr::OffsetOfNode::Array:
643       // Expressions handled below.
644       break;
645 
646     case OffsetOfExpr::OffsetOfNode::Field:
647       VisitDecl(ON.getField());
648       break;
649 
650     case OffsetOfExpr::OffsetOfNode::Identifier:
651       ID.AddPointer(ON.getFieldName());
652       break;
653 
654     case OffsetOfExpr::OffsetOfNode::Base:
655       // These nodes are implicit, and therefore don't need profiling.
656       break;
657     }
658   }
659 
660   VisitExpr(S);
661 }
662 
663 void
664 StmtProfiler::VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *S) {
665   VisitExpr(S);
666   ID.AddInteger(S->getKind());
667   if (S->isArgumentType())
668     VisitType(S->getArgumentType());
669 }
670 
671 void StmtProfiler::VisitArraySubscriptExpr(const ArraySubscriptExpr *S) {
672   VisitExpr(S);
673 }
674 
675 void StmtProfiler::VisitOMPArraySectionExpr(const OMPArraySectionExpr *S) {
676   VisitExpr(S);
677 }
678 
679 void StmtProfiler::VisitCallExpr(const CallExpr *S) {
680   VisitExpr(S);
681 }
682 
683 void StmtProfiler::VisitMemberExpr(const MemberExpr *S) {
684   VisitExpr(S);
685   VisitDecl(S->getMemberDecl());
686   if (!Canonical)
687     VisitNestedNameSpecifier(S->getQualifier());
688   ID.AddBoolean(S->isArrow());
689 }
690 
691 void StmtProfiler::VisitCompoundLiteralExpr(const CompoundLiteralExpr *S) {
692   VisitExpr(S);
693   ID.AddBoolean(S->isFileScope());
694 }
695 
696 void StmtProfiler::VisitCastExpr(const CastExpr *S) {
697   VisitExpr(S);
698 }
699 
700 void StmtProfiler::VisitImplicitCastExpr(const ImplicitCastExpr *S) {
701   VisitCastExpr(S);
702   ID.AddInteger(S->getValueKind());
703 }
704 
705 void StmtProfiler::VisitExplicitCastExpr(const ExplicitCastExpr *S) {
706   VisitCastExpr(S);
707   VisitType(S->getTypeAsWritten());
708 }
709 
710 void StmtProfiler::VisitCStyleCastExpr(const CStyleCastExpr *S) {
711   VisitExplicitCastExpr(S);
712 }
713 
714 void StmtProfiler::VisitBinaryOperator(const BinaryOperator *S) {
715   VisitExpr(S);
716   ID.AddInteger(S->getOpcode());
717 }
718 
719 void
720 StmtProfiler::VisitCompoundAssignOperator(const CompoundAssignOperator *S) {
721   VisitBinaryOperator(S);
722 }
723 
724 void StmtProfiler::VisitConditionalOperator(const ConditionalOperator *S) {
725   VisitExpr(S);
726 }
727 
728 void StmtProfiler::VisitBinaryConditionalOperator(
729     const BinaryConditionalOperator *S) {
730   VisitExpr(S);
731 }
732 
733 void StmtProfiler::VisitAddrLabelExpr(const AddrLabelExpr *S) {
734   VisitExpr(S);
735   VisitDecl(S->getLabel());
736 }
737 
738 void StmtProfiler::VisitStmtExpr(const StmtExpr *S) {
739   VisitExpr(S);
740 }
741 
742 void StmtProfiler::VisitShuffleVectorExpr(const ShuffleVectorExpr *S) {
743   VisitExpr(S);
744 }
745 
746 void StmtProfiler::VisitConvertVectorExpr(const ConvertVectorExpr *S) {
747   VisitExpr(S);
748 }
749 
750 void StmtProfiler::VisitChooseExpr(const ChooseExpr *S) {
751   VisitExpr(S);
752 }
753 
754 void StmtProfiler::VisitGNUNullExpr(const GNUNullExpr *S) {
755   VisitExpr(S);
756 }
757 
758 void StmtProfiler::VisitVAArgExpr(const VAArgExpr *S) {
759   VisitExpr(S);
760 }
761 
762 void StmtProfiler::VisitInitListExpr(const InitListExpr *S) {
763   if (S->getSyntacticForm()) {
764     VisitInitListExpr(S->getSyntacticForm());
765     return;
766   }
767 
768   VisitExpr(S);
769 }
770 
771 void StmtProfiler::VisitDesignatedInitExpr(const DesignatedInitExpr *S) {
772   VisitExpr(S);
773   ID.AddBoolean(S->usesGNUSyntax());
774   for (DesignatedInitExpr::const_designators_iterator D =
775          S->designators_begin(), DEnd = S->designators_end();
776        D != DEnd; ++D) {
777     if (D->isFieldDesignator()) {
778       ID.AddInteger(0);
779       VisitName(D->getFieldName());
780       continue;
781     }
782 
783     if (D->isArrayDesignator()) {
784       ID.AddInteger(1);
785     } else {
786       assert(D->isArrayRangeDesignator());
787       ID.AddInteger(2);
788     }
789     ID.AddInteger(D->getFirstExprIndex());
790   }
791 }
792 
793 // Seems that if VisitInitListExpr() only works on the syntactic form of an
794 // InitListExpr, then a DesignatedInitUpdateExpr is not encountered.
795 void StmtProfiler::VisitDesignatedInitUpdateExpr(
796     const DesignatedInitUpdateExpr *S) {
797   llvm_unreachable("Unexpected DesignatedInitUpdateExpr in syntactic form of "
798                    "initializer");
799 }
800 
801 void StmtProfiler::VisitNoInitExpr(const NoInitExpr *S) {
802   llvm_unreachable("Unexpected NoInitExpr in syntactic form of initializer");
803 }
804 
805 void StmtProfiler::VisitImplicitValueInitExpr(const ImplicitValueInitExpr *S) {
806   VisitExpr(S);
807 }
808 
809 void StmtProfiler::VisitExtVectorElementExpr(const ExtVectorElementExpr *S) {
810   VisitExpr(S);
811   VisitName(&S->getAccessor());
812 }
813 
814 void StmtProfiler::VisitBlockExpr(const BlockExpr *S) {
815   VisitExpr(S);
816   VisitDecl(S->getBlockDecl());
817 }
818 
819 void StmtProfiler::VisitGenericSelectionExpr(const GenericSelectionExpr *S) {
820   VisitExpr(S);
821   for (unsigned i = 0; i != S->getNumAssocs(); ++i) {
822     QualType T = S->getAssocType(i);
823     if (T.isNull())
824       ID.AddPointer(nullptr);
825     else
826       VisitType(T);
827     VisitExpr(S->getAssocExpr(i));
828   }
829 }
830 
831 void StmtProfiler::VisitPseudoObjectExpr(const PseudoObjectExpr *S) {
832   VisitExpr(S);
833   for (PseudoObjectExpr::const_semantics_iterator
834          i = S->semantics_begin(), e = S->semantics_end(); i != e; ++i)
835     // Normally, we would not profile the source expressions of OVEs.
836     if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(*i))
837       Visit(OVE->getSourceExpr());
838 }
839 
840 void StmtProfiler::VisitAtomicExpr(const AtomicExpr *S) {
841   VisitExpr(S);
842   ID.AddInteger(S->getOp());
843 }
844 
845 static Stmt::StmtClass DecodeOperatorCall(const CXXOperatorCallExpr *S,
846                                           UnaryOperatorKind &UnaryOp,
847                                           BinaryOperatorKind &BinaryOp) {
848   switch (S->getOperator()) {
849   case OO_None:
850   case OO_New:
851   case OO_Delete:
852   case OO_Array_New:
853   case OO_Array_Delete:
854   case OO_Arrow:
855   case OO_Call:
856   case OO_Conditional:
857   case NUM_OVERLOADED_OPERATORS:
858     llvm_unreachable("Invalid operator call kind");
859 
860   case OO_Plus:
861     if (S->getNumArgs() == 1) {
862       UnaryOp = UO_Plus;
863       return Stmt::UnaryOperatorClass;
864     }
865 
866     BinaryOp = BO_Add;
867     return Stmt::BinaryOperatorClass;
868 
869   case OO_Minus:
870     if (S->getNumArgs() == 1) {
871       UnaryOp = UO_Minus;
872       return Stmt::UnaryOperatorClass;
873     }
874 
875     BinaryOp = BO_Sub;
876     return Stmt::BinaryOperatorClass;
877 
878   case OO_Star:
879     if (S->getNumArgs() == 1) {
880       UnaryOp = UO_Deref;
881       return Stmt::UnaryOperatorClass;
882     }
883 
884     BinaryOp = BO_Mul;
885     return Stmt::BinaryOperatorClass;
886 
887   case OO_Slash:
888     BinaryOp = BO_Div;
889     return Stmt::BinaryOperatorClass;
890 
891   case OO_Percent:
892     BinaryOp = BO_Rem;
893     return Stmt::BinaryOperatorClass;
894 
895   case OO_Caret:
896     BinaryOp = BO_Xor;
897     return Stmt::BinaryOperatorClass;
898 
899   case OO_Amp:
900     if (S->getNumArgs() == 1) {
901       UnaryOp = UO_AddrOf;
902       return Stmt::UnaryOperatorClass;
903     }
904 
905     BinaryOp = BO_And;
906     return Stmt::BinaryOperatorClass;
907 
908   case OO_Pipe:
909     BinaryOp = BO_Or;
910     return Stmt::BinaryOperatorClass;
911 
912   case OO_Tilde:
913     UnaryOp = UO_Not;
914     return Stmt::UnaryOperatorClass;
915 
916   case OO_Exclaim:
917     UnaryOp = UO_LNot;
918     return Stmt::UnaryOperatorClass;
919 
920   case OO_Equal:
921     BinaryOp = BO_Assign;
922     return Stmt::BinaryOperatorClass;
923 
924   case OO_Less:
925     BinaryOp = BO_LT;
926     return Stmt::BinaryOperatorClass;
927 
928   case OO_Greater:
929     BinaryOp = BO_GT;
930     return Stmt::BinaryOperatorClass;
931 
932   case OO_PlusEqual:
933     BinaryOp = BO_AddAssign;
934     return Stmt::CompoundAssignOperatorClass;
935 
936   case OO_MinusEqual:
937     BinaryOp = BO_SubAssign;
938     return Stmt::CompoundAssignOperatorClass;
939 
940   case OO_StarEqual:
941     BinaryOp = BO_MulAssign;
942     return Stmt::CompoundAssignOperatorClass;
943 
944   case OO_SlashEqual:
945     BinaryOp = BO_DivAssign;
946     return Stmt::CompoundAssignOperatorClass;
947 
948   case OO_PercentEqual:
949     BinaryOp = BO_RemAssign;
950     return Stmt::CompoundAssignOperatorClass;
951 
952   case OO_CaretEqual:
953     BinaryOp = BO_XorAssign;
954     return Stmt::CompoundAssignOperatorClass;
955 
956   case OO_AmpEqual:
957     BinaryOp = BO_AndAssign;
958     return Stmt::CompoundAssignOperatorClass;
959 
960   case OO_PipeEqual:
961     BinaryOp = BO_OrAssign;
962     return Stmt::CompoundAssignOperatorClass;
963 
964   case OO_LessLess:
965     BinaryOp = BO_Shl;
966     return Stmt::BinaryOperatorClass;
967 
968   case OO_GreaterGreater:
969     BinaryOp = BO_Shr;
970     return Stmt::BinaryOperatorClass;
971 
972   case OO_LessLessEqual:
973     BinaryOp = BO_ShlAssign;
974     return Stmt::CompoundAssignOperatorClass;
975 
976   case OO_GreaterGreaterEqual:
977     BinaryOp = BO_ShrAssign;
978     return Stmt::CompoundAssignOperatorClass;
979 
980   case OO_EqualEqual:
981     BinaryOp = BO_EQ;
982     return Stmt::BinaryOperatorClass;
983 
984   case OO_ExclaimEqual:
985     BinaryOp = BO_NE;
986     return Stmt::BinaryOperatorClass;
987 
988   case OO_LessEqual:
989     BinaryOp = BO_LE;
990     return Stmt::BinaryOperatorClass;
991 
992   case OO_GreaterEqual:
993     BinaryOp = BO_GE;
994     return Stmt::BinaryOperatorClass;
995 
996   case OO_AmpAmp:
997     BinaryOp = BO_LAnd;
998     return Stmt::BinaryOperatorClass;
999 
1000   case OO_PipePipe:
1001     BinaryOp = BO_LOr;
1002     return Stmt::BinaryOperatorClass;
1003 
1004   case OO_PlusPlus:
1005     UnaryOp = S->getNumArgs() == 1? UO_PreInc
1006                                   : UO_PostInc;
1007     return Stmt::UnaryOperatorClass;
1008 
1009   case OO_MinusMinus:
1010     UnaryOp = S->getNumArgs() == 1? UO_PreDec
1011                                   : UO_PostDec;
1012     return Stmt::UnaryOperatorClass;
1013 
1014   case OO_Comma:
1015     BinaryOp = BO_Comma;
1016     return Stmt::BinaryOperatorClass;
1017 
1018 
1019   case OO_ArrowStar:
1020     BinaryOp = BO_PtrMemI;
1021     return Stmt::BinaryOperatorClass;
1022 
1023   case OO_Subscript:
1024     return Stmt::ArraySubscriptExprClass;
1025   }
1026 
1027   llvm_unreachable("Invalid overloaded operator expression");
1028 }
1029 
1030 
1031 void StmtProfiler::VisitCXXOperatorCallExpr(const CXXOperatorCallExpr *S) {
1032   if (S->isTypeDependent()) {
1033     // Type-dependent operator calls are profiled like their underlying
1034     // syntactic operator.
1035     UnaryOperatorKind UnaryOp = UO_Extension;
1036     BinaryOperatorKind BinaryOp = BO_Comma;
1037     Stmt::StmtClass SC = DecodeOperatorCall(S, UnaryOp, BinaryOp);
1038 
1039     ID.AddInteger(SC);
1040     for (unsigned I = 0, N = S->getNumArgs(); I != N; ++I)
1041       Visit(S->getArg(I));
1042     if (SC == Stmt::UnaryOperatorClass)
1043       ID.AddInteger(UnaryOp);
1044     else if (SC == Stmt::BinaryOperatorClass ||
1045              SC == Stmt::CompoundAssignOperatorClass)
1046       ID.AddInteger(BinaryOp);
1047     else
1048       assert(SC == Stmt::ArraySubscriptExprClass);
1049 
1050     return;
1051   }
1052 
1053   VisitCallExpr(S);
1054   ID.AddInteger(S->getOperator());
1055 }
1056 
1057 void StmtProfiler::VisitCXXMemberCallExpr(const CXXMemberCallExpr *S) {
1058   VisitCallExpr(S);
1059 }
1060 
1061 void StmtProfiler::VisitCUDAKernelCallExpr(const CUDAKernelCallExpr *S) {
1062   VisitCallExpr(S);
1063 }
1064 
1065 void StmtProfiler::VisitAsTypeExpr(const AsTypeExpr *S) {
1066   VisitExpr(S);
1067 }
1068 
1069 void StmtProfiler::VisitCXXNamedCastExpr(const CXXNamedCastExpr *S) {
1070   VisitExplicitCastExpr(S);
1071 }
1072 
1073 void StmtProfiler::VisitCXXStaticCastExpr(const CXXStaticCastExpr *S) {
1074   VisitCXXNamedCastExpr(S);
1075 }
1076 
1077 void StmtProfiler::VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *S) {
1078   VisitCXXNamedCastExpr(S);
1079 }
1080 
1081 void
1082 StmtProfiler::VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *S) {
1083   VisitCXXNamedCastExpr(S);
1084 }
1085 
1086 void StmtProfiler::VisitCXXConstCastExpr(const CXXConstCastExpr *S) {
1087   VisitCXXNamedCastExpr(S);
1088 }
1089 
1090 void StmtProfiler::VisitUserDefinedLiteral(const UserDefinedLiteral *S) {
1091   VisitCallExpr(S);
1092 }
1093 
1094 void StmtProfiler::VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *S) {
1095   VisitExpr(S);
1096   ID.AddBoolean(S->getValue());
1097 }
1098 
1099 void StmtProfiler::VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *S) {
1100   VisitExpr(S);
1101 }
1102 
1103 void StmtProfiler::VisitCXXStdInitializerListExpr(
1104     const CXXStdInitializerListExpr *S) {
1105   VisitExpr(S);
1106 }
1107 
1108 void StmtProfiler::VisitCXXTypeidExpr(const CXXTypeidExpr *S) {
1109   VisitExpr(S);
1110   if (S->isTypeOperand())
1111     VisitType(S->getTypeOperandSourceInfo()->getType());
1112 }
1113 
1114 void StmtProfiler::VisitCXXUuidofExpr(const CXXUuidofExpr *S) {
1115   VisitExpr(S);
1116   if (S->isTypeOperand())
1117     VisitType(S->getTypeOperandSourceInfo()->getType());
1118 }
1119 
1120 void StmtProfiler::VisitMSPropertyRefExpr(const MSPropertyRefExpr *S) {
1121   VisitExpr(S);
1122   VisitDecl(S->getPropertyDecl());
1123 }
1124 
1125 void StmtProfiler::VisitCXXThisExpr(const CXXThisExpr *S) {
1126   VisitExpr(S);
1127   ID.AddBoolean(S->isImplicit());
1128 }
1129 
1130 void StmtProfiler::VisitCXXThrowExpr(const CXXThrowExpr *S) {
1131   VisitExpr(S);
1132 }
1133 
1134 void StmtProfiler::VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *S) {
1135   VisitExpr(S);
1136   VisitDecl(S->getParam());
1137 }
1138 
1139 void StmtProfiler::VisitCXXDefaultInitExpr(const CXXDefaultInitExpr *S) {
1140   VisitExpr(S);
1141   VisitDecl(S->getField());
1142 }
1143 
1144 void StmtProfiler::VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *S) {
1145   VisitExpr(S);
1146   VisitDecl(
1147          const_cast<CXXDestructorDecl *>(S->getTemporary()->getDestructor()));
1148 }
1149 
1150 void StmtProfiler::VisitCXXConstructExpr(const CXXConstructExpr *S) {
1151   VisitExpr(S);
1152   VisitDecl(S->getConstructor());
1153   ID.AddBoolean(S->isElidable());
1154 }
1155 
1156 void StmtProfiler::VisitCXXFunctionalCastExpr(const CXXFunctionalCastExpr *S) {
1157   VisitExplicitCastExpr(S);
1158 }
1159 
1160 void
1161 StmtProfiler::VisitCXXTemporaryObjectExpr(const CXXTemporaryObjectExpr *S) {
1162   VisitCXXConstructExpr(S);
1163 }
1164 
1165 void
1166 StmtProfiler::VisitLambdaExpr(const LambdaExpr *S) {
1167   VisitExpr(S);
1168   for (LambdaExpr::capture_iterator C = S->explicit_capture_begin(),
1169                                  CEnd = S->explicit_capture_end();
1170        C != CEnd; ++C) {
1171     ID.AddInteger(C->getCaptureKind());
1172     switch (C->getCaptureKind()) {
1173     case LCK_This:
1174       break;
1175     case LCK_ByRef:
1176     case LCK_ByCopy:
1177       VisitDecl(C->getCapturedVar());
1178       ID.AddBoolean(C->isPackExpansion());
1179       break;
1180     case LCK_VLAType:
1181       llvm_unreachable("VLA type in explicit captures.");
1182     }
1183   }
1184   // Note: If we actually needed to be able to match lambda
1185   // expressions, we would have to consider parameters and return type
1186   // here, among other things.
1187   VisitStmt(S->getBody());
1188 }
1189 
1190 void
1191 StmtProfiler::VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *S) {
1192   VisitExpr(S);
1193 }
1194 
1195 void StmtProfiler::VisitCXXDeleteExpr(const CXXDeleteExpr *S) {
1196   VisitExpr(S);
1197   ID.AddBoolean(S->isGlobalDelete());
1198   ID.AddBoolean(S->isArrayForm());
1199   VisitDecl(S->getOperatorDelete());
1200 }
1201 
1202 
1203 void StmtProfiler::VisitCXXNewExpr(const CXXNewExpr *S) {
1204   VisitExpr(S);
1205   VisitType(S->getAllocatedType());
1206   VisitDecl(S->getOperatorNew());
1207   VisitDecl(S->getOperatorDelete());
1208   ID.AddBoolean(S->isArray());
1209   ID.AddInteger(S->getNumPlacementArgs());
1210   ID.AddBoolean(S->isGlobalNew());
1211   ID.AddBoolean(S->isParenTypeId());
1212   ID.AddInteger(S->getInitializationStyle());
1213 }
1214 
1215 void
1216 StmtProfiler::VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *S) {
1217   VisitExpr(S);
1218   ID.AddBoolean(S->isArrow());
1219   VisitNestedNameSpecifier(S->getQualifier());
1220   ID.AddBoolean(S->getScopeTypeInfo() != nullptr);
1221   if (S->getScopeTypeInfo())
1222     VisitType(S->getScopeTypeInfo()->getType());
1223   ID.AddBoolean(S->getDestroyedTypeInfo() != nullptr);
1224   if (S->getDestroyedTypeInfo())
1225     VisitType(S->getDestroyedType());
1226   else
1227     ID.AddPointer(S->getDestroyedTypeIdentifier());
1228 }
1229 
1230 void StmtProfiler::VisitOverloadExpr(const OverloadExpr *S) {
1231   VisitExpr(S);
1232   VisitNestedNameSpecifier(S->getQualifier());
1233   VisitName(S->getName());
1234   ID.AddBoolean(S->hasExplicitTemplateArgs());
1235   if (S->hasExplicitTemplateArgs())
1236     VisitTemplateArguments(S->getExplicitTemplateArgs().getTemplateArgs(),
1237                            S->getExplicitTemplateArgs().NumTemplateArgs);
1238 }
1239 
1240 void
1241 StmtProfiler::VisitUnresolvedLookupExpr(const UnresolvedLookupExpr *S) {
1242   VisitOverloadExpr(S);
1243 }
1244 
1245 void StmtProfiler::VisitTypeTraitExpr(const TypeTraitExpr *S) {
1246   VisitExpr(S);
1247   ID.AddInteger(S->getTrait());
1248   ID.AddInteger(S->getNumArgs());
1249   for (unsigned I = 0, N = S->getNumArgs(); I != N; ++I)
1250     VisitType(S->getArg(I)->getType());
1251 }
1252 
1253 void StmtProfiler::VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *S) {
1254   VisitExpr(S);
1255   ID.AddInteger(S->getTrait());
1256   VisitType(S->getQueriedType());
1257 }
1258 
1259 void StmtProfiler::VisitExpressionTraitExpr(const ExpressionTraitExpr *S) {
1260   VisitExpr(S);
1261   ID.AddInteger(S->getTrait());
1262   VisitExpr(S->getQueriedExpression());
1263 }
1264 
1265 void StmtProfiler::VisitDependentScopeDeclRefExpr(
1266     const DependentScopeDeclRefExpr *S) {
1267   VisitExpr(S);
1268   VisitName(S->getDeclName());
1269   VisitNestedNameSpecifier(S->getQualifier());
1270   ID.AddBoolean(S->hasExplicitTemplateArgs());
1271   if (S->hasExplicitTemplateArgs())
1272     VisitTemplateArguments(S->getTemplateArgs(), S->getNumTemplateArgs());
1273 }
1274 
1275 void StmtProfiler::VisitExprWithCleanups(const ExprWithCleanups *S) {
1276   VisitExpr(S);
1277 }
1278 
1279 void StmtProfiler::VisitCXXUnresolvedConstructExpr(
1280     const CXXUnresolvedConstructExpr *S) {
1281   VisitExpr(S);
1282   VisitType(S->getTypeAsWritten());
1283 }
1284 
1285 void StmtProfiler::VisitCXXDependentScopeMemberExpr(
1286     const CXXDependentScopeMemberExpr *S) {
1287   ID.AddBoolean(S->isImplicitAccess());
1288   if (!S->isImplicitAccess()) {
1289     VisitExpr(S);
1290     ID.AddBoolean(S->isArrow());
1291   }
1292   VisitNestedNameSpecifier(S->getQualifier());
1293   VisitName(S->getMember());
1294   ID.AddBoolean(S->hasExplicitTemplateArgs());
1295   if (S->hasExplicitTemplateArgs())
1296     VisitTemplateArguments(S->getTemplateArgs(), S->getNumTemplateArgs());
1297 }
1298 
1299 void StmtProfiler::VisitUnresolvedMemberExpr(const UnresolvedMemberExpr *S) {
1300   ID.AddBoolean(S->isImplicitAccess());
1301   if (!S->isImplicitAccess()) {
1302     VisitExpr(S);
1303     ID.AddBoolean(S->isArrow());
1304   }
1305   VisitNestedNameSpecifier(S->getQualifier());
1306   VisitName(S->getMemberName());
1307   ID.AddBoolean(S->hasExplicitTemplateArgs());
1308   if (S->hasExplicitTemplateArgs())
1309     VisitTemplateArguments(S->getTemplateArgs(), S->getNumTemplateArgs());
1310 }
1311 
1312 void StmtProfiler::VisitCXXNoexceptExpr(const CXXNoexceptExpr *S) {
1313   VisitExpr(S);
1314 }
1315 
1316 void StmtProfiler::VisitPackExpansionExpr(const PackExpansionExpr *S) {
1317   VisitExpr(S);
1318 }
1319 
1320 void StmtProfiler::VisitSizeOfPackExpr(const SizeOfPackExpr *S) {
1321   VisitExpr(S);
1322   VisitDecl(S->getPack());
1323   if (S->isPartiallySubstituted()) {
1324     auto Args = S->getPartialArguments();
1325     ID.AddInteger(Args.size());
1326     for (const auto &TA : Args)
1327       VisitTemplateArgument(TA);
1328   } else {
1329     ID.AddInteger(0);
1330   }
1331 }
1332 
1333 void StmtProfiler::VisitSubstNonTypeTemplateParmPackExpr(
1334     const SubstNonTypeTemplateParmPackExpr *S) {
1335   VisitExpr(S);
1336   VisitDecl(S->getParameterPack());
1337   VisitTemplateArgument(S->getArgumentPack());
1338 }
1339 
1340 void StmtProfiler::VisitSubstNonTypeTemplateParmExpr(
1341     const SubstNonTypeTemplateParmExpr *E) {
1342   // Profile exactly as the replacement expression.
1343   Visit(E->getReplacement());
1344 }
1345 
1346 void StmtProfiler::VisitFunctionParmPackExpr(const FunctionParmPackExpr *S) {
1347   VisitExpr(S);
1348   VisitDecl(S->getParameterPack());
1349   ID.AddInteger(S->getNumExpansions());
1350   for (FunctionParmPackExpr::iterator I = S->begin(), E = S->end(); I != E; ++I)
1351     VisitDecl(*I);
1352 }
1353 
1354 void StmtProfiler::VisitMaterializeTemporaryExpr(
1355                                            const MaterializeTemporaryExpr *S) {
1356   VisitExpr(S);
1357 }
1358 
1359 void StmtProfiler::VisitCXXFoldExpr(const CXXFoldExpr *S) {
1360   VisitExpr(S);
1361   ID.AddInteger(S->getOperator());
1362 }
1363 
1364 void StmtProfiler::VisitOpaqueValueExpr(const OpaqueValueExpr *E) {
1365   VisitExpr(E);
1366 }
1367 
1368 void StmtProfiler::VisitTypoExpr(const TypoExpr *E) {
1369   VisitExpr(E);
1370 }
1371 
1372 void StmtProfiler::VisitObjCStringLiteral(const ObjCStringLiteral *S) {
1373   VisitExpr(S);
1374 }
1375 
1376 void StmtProfiler::VisitObjCBoxedExpr(const ObjCBoxedExpr *E) {
1377   VisitExpr(E);
1378 }
1379 
1380 void StmtProfiler::VisitObjCArrayLiteral(const ObjCArrayLiteral *E) {
1381   VisitExpr(E);
1382 }
1383 
1384 void StmtProfiler::VisitObjCDictionaryLiteral(const ObjCDictionaryLiteral *E) {
1385   VisitExpr(E);
1386 }
1387 
1388 void StmtProfiler::VisitObjCEncodeExpr(const ObjCEncodeExpr *S) {
1389   VisitExpr(S);
1390   VisitType(S->getEncodedType());
1391 }
1392 
1393 void StmtProfiler::VisitObjCSelectorExpr(const ObjCSelectorExpr *S) {
1394   VisitExpr(S);
1395   VisitName(S->getSelector());
1396 }
1397 
1398 void StmtProfiler::VisitObjCProtocolExpr(const ObjCProtocolExpr *S) {
1399   VisitExpr(S);
1400   VisitDecl(S->getProtocol());
1401 }
1402 
1403 void StmtProfiler::VisitObjCIvarRefExpr(const ObjCIvarRefExpr *S) {
1404   VisitExpr(S);
1405   VisitDecl(S->getDecl());
1406   ID.AddBoolean(S->isArrow());
1407   ID.AddBoolean(S->isFreeIvar());
1408 }
1409 
1410 void StmtProfiler::VisitObjCPropertyRefExpr(const ObjCPropertyRefExpr *S) {
1411   VisitExpr(S);
1412   if (S->isImplicitProperty()) {
1413     VisitDecl(S->getImplicitPropertyGetter());
1414     VisitDecl(S->getImplicitPropertySetter());
1415   } else {
1416     VisitDecl(S->getExplicitProperty());
1417   }
1418   if (S->isSuperReceiver()) {
1419     ID.AddBoolean(S->isSuperReceiver());
1420     VisitType(S->getSuperReceiverType());
1421   }
1422 }
1423 
1424 void StmtProfiler::VisitObjCSubscriptRefExpr(const ObjCSubscriptRefExpr *S) {
1425   VisitExpr(S);
1426   VisitDecl(S->getAtIndexMethodDecl());
1427   VisitDecl(S->setAtIndexMethodDecl());
1428 }
1429 
1430 void StmtProfiler::VisitObjCMessageExpr(const ObjCMessageExpr *S) {
1431   VisitExpr(S);
1432   VisitName(S->getSelector());
1433   VisitDecl(S->getMethodDecl());
1434 }
1435 
1436 void StmtProfiler::VisitObjCIsaExpr(const ObjCIsaExpr *S) {
1437   VisitExpr(S);
1438   ID.AddBoolean(S->isArrow());
1439 }
1440 
1441 void StmtProfiler::VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *S) {
1442   VisitExpr(S);
1443   ID.AddBoolean(S->getValue());
1444 }
1445 
1446 void StmtProfiler::VisitObjCIndirectCopyRestoreExpr(
1447     const ObjCIndirectCopyRestoreExpr *S) {
1448   VisitExpr(S);
1449   ID.AddBoolean(S->shouldCopy());
1450 }
1451 
1452 void StmtProfiler::VisitObjCBridgedCastExpr(const ObjCBridgedCastExpr *S) {
1453   VisitExplicitCastExpr(S);
1454   ID.AddBoolean(S->getBridgeKind());
1455 }
1456 
1457 void StmtProfiler::VisitDecl(const Decl *D) {
1458   ID.AddInteger(D? D->getKind() : 0);
1459 
1460   if (Canonical && D) {
1461     if (const NonTypeTemplateParmDecl *NTTP =
1462           dyn_cast<NonTypeTemplateParmDecl>(D)) {
1463       ID.AddInteger(NTTP->getDepth());
1464       ID.AddInteger(NTTP->getIndex());
1465       ID.AddBoolean(NTTP->isParameterPack());
1466       VisitType(NTTP->getType());
1467       return;
1468     }
1469 
1470     if (const ParmVarDecl *Parm = dyn_cast<ParmVarDecl>(D)) {
1471       // The Itanium C++ ABI uses the type, scope depth, and scope
1472       // index of a parameter when mangling expressions that involve
1473       // function parameters, so we will use the parameter's type for
1474       // establishing function parameter identity. That way, our
1475       // definition of "equivalent" (per C++ [temp.over.link]) is at
1476       // least as strong as the definition of "equivalent" used for
1477       // name mangling.
1478       VisitType(Parm->getType());
1479       ID.AddInteger(Parm->getFunctionScopeDepth());
1480       ID.AddInteger(Parm->getFunctionScopeIndex());
1481       return;
1482     }
1483 
1484     if (const TemplateTypeParmDecl *TTP =
1485           dyn_cast<TemplateTypeParmDecl>(D)) {
1486       ID.AddInteger(TTP->getDepth());
1487       ID.AddInteger(TTP->getIndex());
1488       ID.AddBoolean(TTP->isParameterPack());
1489       return;
1490     }
1491 
1492     if (const TemplateTemplateParmDecl *TTP =
1493           dyn_cast<TemplateTemplateParmDecl>(D)) {
1494       ID.AddInteger(TTP->getDepth());
1495       ID.AddInteger(TTP->getIndex());
1496       ID.AddBoolean(TTP->isParameterPack());
1497       return;
1498     }
1499   }
1500 
1501   ID.AddPointer(D? D->getCanonicalDecl() : nullptr);
1502 }
1503 
1504 void StmtProfiler::VisitType(QualType T) {
1505   if (Canonical)
1506     T = Context.getCanonicalType(T);
1507 
1508   ID.AddPointer(T.getAsOpaquePtr());
1509 }
1510 
1511 void StmtProfiler::VisitName(DeclarationName Name) {
1512   ID.AddPointer(Name.getAsOpaquePtr());
1513 }
1514 
1515 void StmtProfiler::VisitNestedNameSpecifier(NestedNameSpecifier *NNS) {
1516   if (Canonical)
1517     NNS = Context.getCanonicalNestedNameSpecifier(NNS);
1518   ID.AddPointer(NNS);
1519 }
1520 
1521 void StmtProfiler::VisitTemplateName(TemplateName Name) {
1522   if (Canonical)
1523     Name = Context.getCanonicalTemplateName(Name);
1524 
1525   Name.Profile(ID);
1526 }
1527 
1528 void StmtProfiler::VisitTemplateArguments(const TemplateArgumentLoc *Args,
1529                                           unsigned NumArgs) {
1530   ID.AddInteger(NumArgs);
1531   for (unsigned I = 0; I != NumArgs; ++I)
1532     VisitTemplateArgument(Args[I].getArgument());
1533 }
1534 
1535 void StmtProfiler::VisitTemplateArgument(const TemplateArgument &Arg) {
1536   // Mostly repetitive with TemplateArgument::Profile!
1537   ID.AddInteger(Arg.getKind());
1538   switch (Arg.getKind()) {
1539   case TemplateArgument::Null:
1540     break;
1541 
1542   case TemplateArgument::Type:
1543     VisitType(Arg.getAsType());
1544     break;
1545 
1546   case TemplateArgument::Template:
1547   case TemplateArgument::TemplateExpansion:
1548     VisitTemplateName(Arg.getAsTemplateOrTemplatePattern());
1549     break;
1550 
1551   case TemplateArgument::Declaration:
1552     VisitDecl(Arg.getAsDecl());
1553     break;
1554 
1555   case TemplateArgument::NullPtr:
1556     VisitType(Arg.getNullPtrType());
1557     break;
1558 
1559   case TemplateArgument::Integral:
1560     Arg.getAsIntegral().Profile(ID);
1561     VisitType(Arg.getIntegralType());
1562     break;
1563 
1564   case TemplateArgument::Expression:
1565     Visit(Arg.getAsExpr());
1566     break;
1567 
1568   case TemplateArgument::Pack:
1569     for (const auto &P : Arg.pack_elements())
1570       VisitTemplateArgument(P);
1571     break;
1572   }
1573 }
1574 
1575 void Stmt::Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
1576                    bool Canonical) const {
1577   StmtProfiler Profiler(ID, Context, Canonical);
1578   Profiler.Visit(this);
1579 }
1580