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