1 //===--- Expr.cpp - Expression AST Node Implementation --------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Expr class and subclasses.
12 //===----------------------------------------------------------------------===//
14 #include "clang/AST/Expr.h"
15 #include "clang/AST/ExprCXX.h"
16 #include "clang/AST/APValue.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/DeclObjC.h"
19 #include "clang/AST/DeclCXX.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/RecordLayout.h"
22 #include "clang/AST/StmtVisitor.h"
23 #include "clang/Basic/Builtins.h"
24 #include "clang/Basic/TargetInfo.h"
25 #include "llvm/Support/ErrorHandling.h"
26 #include "llvm/Support/raw_ostream.h"
28 using namespace clang;
30 //===----------------------------------------------------------------------===//
31 // Primary Expressions.
32 //===----------------------------------------------------------------------===//
34 void ExplicitTemplateArgumentList::initializeFrom(
35 const TemplateArgumentListInfo &Info) {
36 LAngleLoc = Info.getLAngleLoc();
37 RAngleLoc = Info.getRAngleLoc();
38 NumTemplateArgs = Info.size();
40 TemplateArgumentLoc *ArgBuffer = getTemplateArgs();
41 for (unsigned i = 0; i != NumTemplateArgs; ++i)
42 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
45 void ExplicitTemplateArgumentList::copyInto(
46 TemplateArgumentListInfo &Info) const {
47 Info.setLAngleLoc(LAngleLoc);
48 Info.setRAngleLoc(RAngleLoc);
49 for (unsigned I = 0; I != NumTemplateArgs; ++I)
50 Info.addArgument(getTemplateArgs()[I]);
53 std::size_t ExplicitTemplateArgumentList::sizeFor(
54 const TemplateArgumentListInfo &Info) {
55 return sizeof(ExplicitTemplateArgumentList) +
56 sizeof(TemplateArgumentLoc) * Info.size();
59 void DeclRefExpr::computeDependence() {
60 TypeDependent = false;
61 ValueDependent = false;
63 NamedDecl *D = getDecl();
65 // (TD) C++ [temp.dep.expr]p3:
66 // An id-expression is type-dependent if it contains:
70 // (VD) C++ [temp.dep.constexpr]p2:
71 // An identifier is value-dependent if it is:
73 // (TD) - an identifier that was declared with dependent type
74 // (VD) - a name declared with a dependent type,
75 if (getType()->isDependentType()) {
77 ValueDependent = true;
79 // (TD) - a conversion-function-id that specifies a dependent type
80 else if (D->getDeclName().getNameKind()
81 == DeclarationName::CXXConversionFunctionName &&
82 D->getDeclName().getCXXNameType()->isDependentType()) {
84 ValueDependent = true;
86 // (TD) - a template-id that is dependent,
87 else if (hasExplicitTemplateArgumentList() &&
88 TemplateSpecializationType::anyDependentTemplateArguments(
90 getNumTemplateArgs())) {
92 ValueDependent = true;
94 // (VD) - the name of a non-type template parameter,
95 else if (isa<NonTypeTemplateParmDecl>(D))
96 ValueDependent = true;
97 // (VD) - a constant with integral or enumeration type and is
98 // initialized with an expression that is value-dependent.
99 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
100 if (Var->getType()->isIntegralType() &&
101 Var->getType().getCVRQualifiers() == Qualifiers::Const) {
102 if (const Expr *Init = Var->getAnyInitializer())
103 if (Init->isValueDependent())
104 ValueDependent = true;
107 // (TD) - a nested-name-specifier or a qualified-id that names a
108 // member of an unknown specialization.
109 // (handled by DependentScopeDeclRefExpr)
112 DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier,
113 SourceRange QualifierRange,
114 ValueDecl *D, SourceLocation NameLoc,
115 const TemplateArgumentListInfo *TemplateArgs,
117 : Expr(DeclRefExprClass, T, false, false),
119 (Qualifier? HasQualifierFlag : 0) |
120 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)),
123 NameQualifier *NQ = getNameQualifier();
125 NQ->Range = QualifierRange;
129 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs);
134 DeclRefExpr *DeclRefExpr::Create(ASTContext &Context,
135 NestedNameSpecifier *Qualifier,
136 SourceRange QualifierRange,
138 SourceLocation NameLoc,
140 const TemplateArgumentListInfo *TemplateArgs) {
141 std::size_t Size = sizeof(DeclRefExpr);
143 Size += sizeof(NameQualifier);
146 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs);
148 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>());
149 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc,
153 SourceRange DeclRefExpr::getSourceRange() const {
154 // FIXME: Does not handle multi-token names well, e.g., operator[].
158 R.setBegin(getQualifierRange().getBegin());
159 if (hasExplicitTemplateArgumentList())
160 R.setEnd(getRAngleLoc());
164 // FIXME: Maybe this should use DeclPrinter with a special "print predefined
165 // expr" policy instead.
166 std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) {
167 ASTContext &Context = CurrentDecl->getASTContext();
169 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
170 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual)
171 return FD->getNameAsString();
173 llvm::SmallString<256> Name;
174 llvm::raw_svector_ostream Out(Name);
176 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
177 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual)
183 PrintingPolicy Policy(Context.getLangOptions());
185 std::string Proto = FD->getQualifiedNameAsString(Policy);
187 const FunctionType *AFT = FD->getType()->getAs<FunctionType>();
188 const FunctionProtoType *FT = 0;
189 if (FD->hasWrittenPrototype())
190 FT = dyn_cast<FunctionProtoType>(AFT);
194 llvm::raw_string_ostream POut(Proto);
195 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
198 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy);
202 if (FT->isVariadic()) {
203 if (FD->getNumParams()) POut << ", ";
209 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
210 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers());
211 if (ThisQuals.hasConst())
213 if (ThisQuals.hasVolatile())
214 Proto += " volatile";
217 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD))
218 AFT->getResultType().getAsStringInternal(Proto, Policy);
223 return Name.str().str();
225 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) {
226 llvm::SmallString<256> Name;
227 llvm::raw_svector_ostream Out(Name);
228 Out << (MD->isInstanceMethod() ? '-' : '+');
231 // For incorrect code, there might not be an ObjCInterfaceDecl. Do
232 // a null check to avoid a crash.
233 if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
234 Out << ID->getNameAsString();
236 if (const ObjCCategoryImplDecl *CID =
237 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) {
239 Out << CID->getNameAsString();
243 Out << MD->getSelector().getAsString();
247 return Name.str().str();
249 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) {
250 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
256 /// getValueAsApproximateDouble - This returns the value as an inaccurate
257 /// double. Note that this may cause loss of precision, but is useful for
258 /// debugging dumps, etc.
259 double FloatingLiteral::getValueAsApproximateDouble() const {
260 llvm::APFloat V = getValue();
262 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
264 return V.convertToDouble();
267 StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData,
268 unsigned ByteLength, bool Wide,
270 const SourceLocation *Loc,
272 // Allocate enough space for the StringLiteral plus an array of locations for
273 // any concatenated string tokens.
274 void *Mem = C.Allocate(sizeof(StringLiteral)+
275 sizeof(SourceLocation)*(NumStrs-1),
276 llvm::alignof<StringLiteral>());
277 StringLiteral *SL = new (Mem) StringLiteral(Ty);
279 // OPTIMIZE: could allocate this appended to the StringLiteral.
280 char *AStrData = new (C, 1) char[ByteLength];
281 memcpy(AStrData, StrData, ByteLength);
282 SL->StrData = AStrData;
283 SL->ByteLength = ByteLength;
285 SL->TokLocs[0] = Loc[0];
286 SL->NumConcatenated = NumStrs;
289 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1));
293 StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) {
294 void *Mem = C.Allocate(sizeof(StringLiteral)+
295 sizeof(SourceLocation)*(NumStrs-1),
296 llvm::alignof<StringLiteral>());
297 StringLiteral *SL = new (Mem) StringLiteral(QualType());
300 SL->NumConcatenated = NumStrs;
304 void StringLiteral::DoDestroy(ASTContext &C) {
305 C.Deallocate(const_cast<char*>(StrData));
309 void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) {
311 C.Deallocate(const_cast<char*>(StrData));
313 char *AStrData = new (C, 1) char[Str.size()];
314 memcpy(AStrData, Str.data(), Str.size());
316 ByteLength = Str.size();
319 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
320 /// corresponds to, e.g. "sizeof" or "[pre]++".
321 const char *UnaryOperator::getOpcodeStr(Opcode Op) {
323 default: assert(0 && "Unknown unary operator");
324 case PostInc: return "++";
325 case PostDec: return "--";
326 case PreInc: return "++";
327 case PreDec: return "--";
328 case AddrOf: return "&";
329 case Deref: return "*";
330 case Plus: return "+";
331 case Minus: return "-";
332 case Not: return "~";
333 case LNot: return "!";
334 case Real: return "__real";
335 case Imag: return "__imag";
336 case Extension: return "__extension__";
337 case OffsetOf: return "__builtin_offsetof";
341 UnaryOperator::Opcode
342 UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
344 default: assert(false && "No unary operator for overloaded function");
345 case OO_PlusPlus: return Postfix ? PostInc : PreInc;
346 case OO_MinusMinus: return Postfix ? PostDec : PreDec;
347 case OO_Amp: return AddrOf;
348 case OO_Star: return Deref;
349 case OO_Plus: return Plus;
350 case OO_Minus: return Minus;
351 case OO_Tilde: return Not;
352 case OO_Exclaim: return LNot;
356 OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
358 case PostInc: case PreInc: return OO_PlusPlus;
359 case PostDec: case PreDec: return OO_MinusMinus;
360 case AddrOf: return OO_Amp;
361 case Deref: return OO_Star;
362 case Plus: return OO_Plus;
363 case Minus: return OO_Minus;
364 case Not: return OO_Tilde;
365 case LNot: return OO_Exclaim;
366 default: return OO_None;
371 //===----------------------------------------------------------------------===//
372 // Postfix Operators.
373 //===----------------------------------------------------------------------===//
375 CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args,
376 unsigned numargs, QualType t, SourceLocation rparenloc)
378 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs),
379 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)),
382 SubExprs = new (C) Stmt*[numargs+1];
384 for (unsigned i = 0; i != numargs; ++i)
385 SubExprs[i+ARGS_START] = args[i];
387 RParenLoc = rparenloc;
390 CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs,
391 QualType t, SourceLocation rparenloc)
392 : Expr(CallExprClass, t,
393 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs),
394 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)),
397 SubExprs = new (C) Stmt*[numargs+1];
399 for (unsigned i = 0; i != numargs; ++i)
400 SubExprs[i+ARGS_START] = args[i];
402 RParenLoc = rparenloc;
405 CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty)
406 : Expr(SC, Empty), SubExprs(0), NumArgs(0) {
407 SubExprs = new (C) Stmt*[1];
410 void CallExpr::DoDestroy(ASTContext& C) {
412 if (SubExprs) C.Deallocate(SubExprs);
417 Decl *CallExpr::getCalleeDecl() {
418 Expr *CEE = getCallee()->IgnoreParenCasts();
419 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE))
420 return DRE->getDecl();
421 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE))
422 return ME->getMemberDecl();
427 FunctionDecl *CallExpr::getDirectCallee() {
428 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl());
431 /// setNumArgs - This changes the number of arguments present in this call.
432 /// Any orphaned expressions are deleted by this, and any new operands are set
434 void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) {
435 // No change, just return.
436 if (NumArgs == getNumArgs()) return;
438 // If shrinking # arguments, just delete the extras and forgot them.
439 if (NumArgs < getNumArgs()) {
440 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i)
441 getArg(i)->Destroy(C);
442 this->NumArgs = NumArgs;
446 // Otherwise, we are growing the # arguments. New an bigger argument array.
447 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1];
449 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i)
450 NewSubExprs[i] = SubExprs[i];
451 // Null out new args.
452 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i)
455 if (SubExprs) C.Deallocate(SubExprs);
456 SubExprs = NewSubExprs;
457 this->NumArgs = NumArgs;
460 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If
462 unsigned CallExpr::isBuiltinCall(ASTContext &Context) const {
463 // All simple function calls (e.g. func()) are implicitly cast to pointer to
464 // function. As a result, we try and obtain the DeclRefExpr from the
466 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
467 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
470 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
474 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
478 if (!FDecl->getIdentifier())
481 return FDecl->getBuiltinID();
484 QualType CallExpr::getCallReturnType() const {
485 QualType CalleeType = getCallee()->getType();
486 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>())
487 CalleeType = FnTypePtr->getPointeeType();
488 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>())
489 CalleeType = BPT->getPointeeType();
491 const FunctionType *FnType = CalleeType->getAs<FunctionType>();
492 return FnType->getResultType();
495 MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow,
496 NestedNameSpecifier *qual,
497 SourceRange qualrange,
498 ValueDecl *memberdecl,
499 NamedDecl *founddecl,
501 const TemplateArgumentListInfo *targs,
503 std::size_t Size = sizeof(MemberExpr);
505 bool hasQualOrFound = (qual != 0 || founddecl != memberdecl);
507 Size += sizeof(MemberNameQualifier);
510 Size += ExplicitTemplateArgumentList::sizeFor(*targs);
512 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>());
513 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, l, ty);
515 if (hasQualOrFound) {
516 if (qual && qual->isDependent()) {
517 E->setValueDependent(true);
518 E->setTypeDependent(true);
520 E->HasQualifierOrFoundDecl = true;
522 MemberNameQualifier *NQ = E->getMemberQualifier();
524 NQ->Range = qualrange;
525 NQ->FoundDecl = founddecl;
529 E->HasExplicitTemplateArgumentList = true;
530 E->getExplicitTemplateArgumentList()->initializeFrom(*targs);
536 const char *CastExpr::getCastKindName() const {
537 switch (getCastKind()) {
538 case CastExpr::CK_Unknown:
540 case CastExpr::CK_BitCast:
542 case CastExpr::CK_NoOp:
544 case CastExpr::CK_BaseToDerived:
545 return "BaseToDerived";
546 case CastExpr::CK_DerivedToBase:
547 return "DerivedToBase";
548 case CastExpr::CK_UncheckedDerivedToBase:
549 return "UncheckedDerivedToBase";
550 case CastExpr::CK_Dynamic:
552 case CastExpr::CK_ToUnion:
554 case CastExpr::CK_ArrayToPointerDecay:
555 return "ArrayToPointerDecay";
556 case CastExpr::CK_FunctionToPointerDecay:
557 return "FunctionToPointerDecay";
558 case CastExpr::CK_NullToMemberPointer:
559 return "NullToMemberPointer";
560 case CastExpr::CK_BaseToDerivedMemberPointer:
561 return "BaseToDerivedMemberPointer";
562 case CastExpr::CK_DerivedToBaseMemberPointer:
563 return "DerivedToBaseMemberPointer";
564 case CastExpr::CK_UserDefinedConversion:
565 return "UserDefinedConversion";
566 case CastExpr::CK_ConstructorConversion:
567 return "ConstructorConversion";
568 case CastExpr::CK_IntegralToPointer:
569 return "IntegralToPointer";
570 case CastExpr::CK_PointerToIntegral:
571 return "PointerToIntegral";
572 case CastExpr::CK_ToVoid:
574 case CastExpr::CK_VectorSplat:
575 return "VectorSplat";
576 case CastExpr::CK_IntegralCast:
577 return "IntegralCast";
578 case CastExpr::CK_IntegralToFloating:
579 return "IntegralToFloating";
580 case CastExpr::CK_FloatingToIntegral:
581 return "FloatingToIntegral";
582 case CastExpr::CK_FloatingCast:
583 return "FloatingCast";
584 case CastExpr::CK_MemberPointerToBoolean:
585 return "MemberPointerToBoolean";
586 case CastExpr::CK_AnyPointerToObjCPointerCast:
587 return "AnyPointerToObjCPointerCast";
588 case CastExpr::CK_AnyPointerToBlockPointerCast:
589 return "AnyPointerToBlockPointerCast";
592 assert(0 && "Unhandled cast kind!");
596 Expr *CastExpr::getSubExprAsWritten() {
600 SubExpr = E->getSubExpr();
602 // Skip any temporary bindings; they're implicit.
603 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
604 SubExpr = Binder->getSubExpr();
606 // Conversions by constructor and conversion functions have a
607 // subexpression describing the call; strip it off.
608 if (E->getCastKind() == CastExpr::CK_ConstructorConversion)
609 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0);
610 else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion)
611 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument();
613 // If the subexpression we're left with is an implicit cast, look
614 // through that, too.
615 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr)));
620 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
621 /// corresponds to, e.g. "<<=".
622 const char *BinaryOperator::getOpcodeStr(Opcode Op) {
624 case PtrMemD: return ".*";
625 case PtrMemI: return "->*";
626 case Mul: return "*";
627 case Div: return "/";
628 case Rem: return "%";
629 case Add: return "+";
630 case Sub: return "-";
631 case Shl: return "<<";
632 case Shr: return ">>";
635 case LE: return "<=";
636 case GE: return ">=";
637 case EQ: return "==";
638 case NE: return "!=";
639 case And: return "&";
640 case Xor: return "^";
642 case LAnd: return "&&";
643 case LOr: return "||";
644 case Assign: return "=";
645 case MulAssign: return "*=";
646 case DivAssign: return "/=";
647 case RemAssign: return "%=";
648 case AddAssign: return "+=";
649 case SubAssign: return "-=";
650 case ShlAssign: return "<<=";
651 case ShrAssign: return ">>=";
652 case AndAssign: return "&=";
653 case XorAssign: return "^=";
654 case OrAssign: return "|=";
655 case Comma: return ",";
661 BinaryOperator::Opcode
662 BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
664 default: assert(false && "Not an overloadable binary operator");
665 case OO_Plus: return Add;
666 case OO_Minus: return Sub;
667 case OO_Star: return Mul;
668 case OO_Slash: return Div;
669 case OO_Percent: return Rem;
670 case OO_Caret: return Xor;
671 case OO_Amp: return And;
672 case OO_Pipe: return Or;
673 case OO_Equal: return Assign;
674 case OO_Less: return LT;
675 case OO_Greater: return GT;
676 case OO_PlusEqual: return AddAssign;
677 case OO_MinusEqual: return SubAssign;
678 case OO_StarEqual: return MulAssign;
679 case OO_SlashEqual: return DivAssign;
680 case OO_PercentEqual: return RemAssign;
681 case OO_CaretEqual: return XorAssign;
682 case OO_AmpEqual: return AndAssign;
683 case OO_PipeEqual: return OrAssign;
684 case OO_LessLess: return Shl;
685 case OO_GreaterGreater: return Shr;
686 case OO_LessLessEqual: return ShlAssign;
687 case OO_GreaterGreaterEqual: return ShrAssign;
688 case OO_EqualEqual: return EQ;
689 case OO_ExclaimEqual: return NE;
690 case OO_LessEqual: return LE;
691 case OO_GreaterEqual: return GE;
692 case OO_AmpAmp: return LAnd;
693 case OO_PipePipe: return LOr;
694 case OO_Comma: return Comma;
695 case OO_ArrowStar: return PtrMemI;
699 OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
700 static const OverloadedOperatorKind OverOps[] = {
701 /* .* Cannot be overloaded */OO_None, OO_ArrowStar,
702 OO_Star, OO_Slash, OO_Percent,
704 OO_LessLess, OO_GreaterGreater,
705 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
706 OO_EqualEqual, OO_ExclaimEqual,
712 OO_Equal, OO_StarEqual,
713 OO_SlashEqual, OO_PercentEqual,
714 OO_PlusEqual, OO_MinusEqual,
715 OO_LessLessEqual, OO_GreaterGreaterEqual,
716 OO_AmpEqual, OO_CaretEqual,
723 InitListExpr::InitListExpr(SourceLocation lbraceloc,
724 Expr **initExprs, unsigned numInits,
725 SourceLocation rbraceloc)
726 : Expr(InitListExprClass, QualType(), false, false),
727 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0),
728 UnionFieldInit(0), HadArrayRangeDesignator(false)
730 for (unsigned I = 0; I != numInits; ++I) {
731 if (initExprs[I]->isTypeDependent())
732 TypeDependent = true;
733 if (initExprs[I]->isValueDependent())
734 ValueDependent = true;
737 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits);
740 void InitListExpr::reserveInits(unsigned NumInits) {
741 if (NumInits > InitExprs.size())
742 InitExprs.reserve(NumInits);
745 void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) {
746 for (unsigned Idx = NumInits, LastIdx = InitExprs.size();
747 Idx < LastIdx; ++Idx)
748 InitExprs[Idx]->Destroy(Context);
749 InitExprs.resize(NumInits, 0);
752 Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) {
753 if (Init >= InitExprs.size()) {
754 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0);
755 InitExprs.back() = expr;
759 Expr *Result = cast_or_null<Expr>(InitExprs[Init]);
760 InitExprs[Init] = expr;
764 /// getFunctionType - Return the underlying function type for this block.
766 const FunctionType *BlockExpr::getFunctionType() const {
767 return getType()->getAs<BlockPointerType>()->
768 getPointeeType()->getAs<FunctionType>();
771 SourceLocation BlockExpr::getCaretLocation() const {
772 return TheBlock->getCaretLocation();
774 const Stmt *BlockExpr::getBody() const {
775 return TheBlock->getBody();
777 Stmt *BlockExpr::getBody() {
778 return TheBlock->getBody();
782 //===----------------------------------------------------------------------===//
783 // Generic Expression Routines
784 //===----------------------------------------------------------------------===//
786 /// isUnusedResultAWarning - Return true if this immediate expression should
787 /// be warned about if the result is unused. If so, fill in Loc and Ranges
788 /// with location to warn on and the source range[s] to report with the
790 bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
791 SourceRange &R2, ASTContext &Ctx) const {
792 // Don't warn if the expr is type dependent. The type could end up
793 // instantiating to void.
794 if (isTypeDependent())
797 switch (getStmtClass()) {
799 if (getType()->isVoidType())
802 R1 = getSourceRange();
805 return cast<ParenExpr>(this)->getSubExpr()->
806 isUnusedResultAWarning(Loc, R1, R2, Ctx);
807 case UnaryOperatorClass: {
808 const UnaryOperator *UO = cast<UnaryOperator>(this);
810 switch (UO->getOpcode()) {
812 case UnaryOperator::PostInc:
813 case UnaryOperator::PostDec:
814 case UnaryOperator::PreInc:
815 case UnaryOperator::PreDec: // ++/--
816 return false; // Not a warning.
817 case UnaryOperator::Deref:
818 // Dereferencing a volatile pointer is a side-effect.
819 if (Ctx.getCanonicalType(getType()).isVolatileQualified())
822 case UnaryOperator::Real:
823 case UnaryOperator::Imag:
824 // accessing a piece of a volatile complex is a side-effect.
825 if (Ctx.getCanonicalType(UO->getSubExpr()->getType())
826 .isVolatileQualified())
829 case UnaryOperator::Extension:
830 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
832 Loc = UO->getOperatorLoc();
833 R1 = UO->getSubExpr()->getSourceRange();
836 case BinaryOperatorClass: {
837 const BinaryOperator *BO = cast<BinaryOperator>(this);
838 // Consider comma to have side effects if the LHS or RHS does.
839 if (BO->getOpcode() == BinaryOperator::Comma) {
840 // ((foo = <blah>), 0) is an idiom for hiding the result (and
841 // lvalue-ness) of an assignment written in a macro.
842 if (IntegerLiteral *IE =
843 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens()))
844 if (IE->getValue() == 0)
847 return (BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) ||
848 BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
851 if (BO->isAssignmentOp())
853 Loc = BO->getOperatorLoc();
854 R1 = BO->getLHS()->getSourceRange();
855 R2 = BO->getRHS()->getSourceRange();
858 case CompoundAssignOperatorClass:
861 case ConditionalOperatorClass: {
862 // The condition must be evaluated, but if either the LHS or RHS is a
863 // warning, warn about them.
864 const ConditionalOperator *Exp = cast<ConditionalOperator>(this);
866 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx))
868 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
871 case MemberExprClass:
872 // If the base pointer or element is to a volatile pointer/field, accessing
873 // it is a side effect.
874 if (Ctx.getCanonicalType(getType()).isVolatileQualified())
876 Loc = cast<MemberExpr>(this)->getMemberLoc();
877 R1 = SourceRange(Loc, Loc);
878 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange();
881 case ArraySubscriptExprClass:
882 // If the base pointer or element is to a volatile pointer/field, accessing
883 // it is a side effect.
884 if (Ctx.getCanonicalType(getType()).isVolatileQualified())
886 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
887 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
888 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
892 case CXXOperatorCallExprClass:
893 case CXXMemberCallExprClass: {
894 // If this is a direct call, get the callee.
895 const CallExpr *CE = cast<CallExpr>(this);
896 if (const Decl *FD = CE->getCalleeDecl()) {
897 // If the callee has attribute pure, const, or warn_unused_result, warn
898 // about it. void foo() { strlen("bar"); } should warn.
900 // Note: If new cases are added here, DiagnoseUnusedExprResult should be
901 // updated to match for QoI.
902 if (FD->getAttr<WarnUnusedResultAttr>() ||
903 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) {
904 Loc = CE->getCallee()->getLocStart();
905 R1 = CE->getCallee()->getSourceRange();
907 if (unsigned NumArgs = CE->getNumArgs())
908 R2 = SourceRange(CE->getArg(0)->getLocStart(),
909 CE->getArg(NumArgs-1)->getLocEnd());
916 case CXXTemporaryObjectExprClass:
917 case CXXConstructExprClass:
920 case ObjCMessageExprClass: {
921 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this);
922 const ObjCMethodDecl *MD = ME->getMethodDecl();
923 if (MD && MD->getAttr<WarnUnusedResultAttr>()) {
930 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send.
932 const ObjCImplicitSetterGetterRefExpr *Ref =
933 cast<ObjCImplicitSetterGetterRefExpr>(this);
934 // FIXME: We really want the location of the '.' here.
935 Loc = Ref->getLocation();
936 R1 = SourceRange(Ref->getLocation(), Ref->getLocation());
938 R2 = Ref->getBase()->getSourceRange();
941 R1 = getSourceRange();
945 case StmtExprClass: {
946 // Statement exprs don't logically have side effects themselves, but are
947 // sometimes used in macros in ways that give them a type that is unused.
948 // For example ({ blah; foo(); }) will end up with a type if foo has a type.
949 // however, if the result of the stmt expr is dead, we don't want to emit a
951 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt();
952 if (!CS->body_empty())
953 if (const Expr *E = dyn_cast<Expr>(CS->body_back()))
954 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx);
956 if (getType()->isVoidType())
958 Loc = cast<StmtExpr>(this)->getLParenLoc();
959 R1 = getSourceRange();
962 case CStyleCastExprClass:
963 // If this is an explicit cast to void, allow it. People do this when they
964 // think they know what they're doing :).
965 if (getType()->isVoidType())
967 Loc = cast<CStyleCastExpr>(this)->getLParenLoc();
968 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange();
970 case CXXFunctionalCastExprClass: {
971 if (getType()->isVoidType())
973 const CastExpr *CE = cast<CastExpr>(this);
975 // If this is a cast to void or a constructor conversion, check the operand.
976 // Otherwise, the result of the cast is unused.
977 if (CE->getCastKind() == CastExpr::CK_ToVoid ||
978 CE->getCastKind() == CastExpr::CK_ConstructorConversion)
979 return (cast<CastExpr>(this)->getSubExpr()
980 ->isUnusedResultAWarning(Loc, R1, R2, Ctx));
981 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc();
982 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange();
986 case ImplicitCastExprClass:
987 // Check the operand, since implicit casts are inserted by Sema
988 return (cast<ImplicitCastExpr>(this)
989 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
991 case CXXDefaultArgExprClass:
992 return (cast<CXXDefaultArgExpr>(this)
993 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
995 case CXXNewExprClass:
996 // FIXME: In theory, there might be new expressions that don't have side
997 // effects (e.g. a placement new with an uninitialized POD).
998 case CXXDeleteExprClass:
1000 case CXXBindTemporaryExprClass:
1001 return (cast<CXXBindTemporaryExpr>(this)
1002 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1003 case CXXExprWithTemporariesClass:
1004 return (cast<CXXExprWithTemporaries>(this)
1005 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1009 /// DeclCanBeLvalue - Determine whether the given declaration can be
1010 /// an lvalue. This is a helper routine for isLvalue.
1011 static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) {
1012 // C++ [temp.param]p6:
1013 // A non-type non-reference template-parameter is not an lvalue.
1014 if (const NonTypeTemplateParmDecl *NTTParm
1015 = dyn_cast<NonTypeTemplateParmDecl>(Decl))
1016 return NTTParm->getType()->isReferenceType();
1018 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) ||
1019 // C++ 3.10p2: An lvalue refers to an object or function.
1020 (Ctx.getLangOptions().CPlusPlus &&
1021 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl)));
1024 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an
1025 /// incomplete type other than void. Nonarray expressions that can be lvalues:
1026 /// - name, where name must be a variable
1028 /// - (e), where e must be an lvalue
1029 /// - e.name, where e must be an lvalue
1031 /// - *e, the type of e cannot be a function type
1032 /// - string-constant
1033 /// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension]
1034 /// - reference type [C++ [expr]]
1036 Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const {
1037 assert(!TR->isReferenceType() && "Expressions can't have reference type.");
1039 isLvalueResult Res = isLvalueInternal(Ctx);
1040 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus)
1043 // first, check the type (C99 6.3.2.1). Expressions with function
1044 // type in C are not lvalues, but they can be lvalues in C++.
1045 if (TR->isFunctionType() || TR == Ctx.OverloadTy)
1046 return LV_NotObjectType;
1048 // Allow qualified void which is an incomplete type other than void (yuck).
1049 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers())
1050 return LV_IncompleteVoidType;
1055 // Check whether the expression can be sanely treated like an l-value
1056 Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const {
1057 switch (getStmtClass()) {
1058 case ObjCIsaExprClass:
1059 case StringLiteralClass: // C99 6.5.1p4
1060 case ObjCEncodeExprClass: // @encode behaves like its string in every way.
1062 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2))))
1063 // For vectors, make sure base is an lvalue (i.e. not a function call).
1064 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType())
1065 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx);
1067 case DeclRefExprClass: { // C99 6.5.1p2
1068 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl();
1069 if (DeclCanBeLvalue(RefdDecl, Ctx))
1073 case BlockDeclRefExprClass: {
1074 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this);
1075 if (isa<VarDecl>(BDR->getDecl()))
1079 case MemberExprClass: {
1080 const MemberExpr *m = cast<MemberExpr>(this);
1081 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4:
1082 NamedDecl *Member = m->getMemberDecl();
1083 // C++ [expr.ref]p4:
1084 // If E2 is declared to have type "reference to T", then E1.E2
1086 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member))
1087 if (Value->getType()->isReferenceType())
1090 // -- If E2 is a static data member [...] then E1.E2 is an lvalue.
1091 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord())
1094 // -- If E2 is a non-static data member [...]. If E1 is an
1095 // lvalue, then E1.E2 is an lvalue.
1096 if (isa<FieldDecl>(Member)) {
1099 return m->getBase()->isLvalue(Ctx);
1102 // -- If it refers to a static member function [...], then
1103 // E1.E2 is an lvalue.
1104 // -- Otherwise, if E1.E2 refers to a non-static member
1105 // function [...], then E1.E2 is not an lvalue.
1106 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member))
1107 return Method->isStatic()? LV_Valid : LV_MemberFunction;
1109 // -- If E2 is a member enumerator [...], the expression E1.E2
1110 // is not an lvalue.
1111 if (isa<EnumConstantDecl>(Member))
1112 return LV_InvalidExpression;
1115 return LV_InvalidExpression;
1121 Expr *BaseExp = m->getBase();
1122 if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass ||
1123 BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass)
1124 return LV_SubObjCPropertySetting;
1126 BaseExp->isLvalue(Ctx);
1128 case UnaryOperatorClass:
1129 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref)
1130 return LV_Valid; // C99 6.5.3p4
1132 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real ||
1133 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag ||
1134 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension)
1135 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU.
1137 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1
1138 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc ||
1139 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec))
1142 case ImplicitCastExprClass:
1143 if (cast<ImplicitCastExpr>(this)->isLvalueCast())
1146 // If this is a conversion to a class temporary, make a note of
1148 if (Ctx.getLangOptions().CPlusPlus && getType()->isRecordType())
1149 return LV_ClassTemporary;
1152 case ParenExprClass: // C99 6.5.1p5
1153 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx);
1154 case BinaryOperatorClass:
1155 case CompoundAssignOperatorClass: {
1156 const BinaryOperator *BinOp = cast<BinaryOperator>(this);
1158 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1
1159 BinOp->getOpcode() == BinaryOperator::Comma)
1160 return BinOp->getRHS()->isLvalue(Ctx);
1162 // C++ [expr.mptr.oper]p6
1163 // The result of a .* expression is an lvalue only if its first operand is
1164 // an lvalue and its second operand is a pointer to data member.
1165 if (BinOp->getOpcode() == BinaryOperator::PtrMemD &&
1166 !BinOp->getType()->isFunctionType())
1167 return BinOp->getLHS()->isLvalue(Ctx);
1169 // The result of an ->* expression is an lvalue only if its second operand
1170 // is a pointer to data member.
1171 if (BinOp->getOpcode() == BinaryOperator::PtrMemI &&
1172 !BinOp->getType()->isFunctionType()) {
1173 QualType Ty = BinOp->getRHS()->getType();
1174 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType())
1178 if (!BinOp->isAssignmentOp())
1179 return LV_InvalidExpression;
1181 if (Ctx.getLangOptions().CPlusPlus)
1182 // C++ [expr.ass]p1:
1183 // The result of an assignment operation [...] is an lvalue.
1188 // An assignment expression [...] is not an lvalue.
1189 return LV_InvalidExpression;
1192 case CXXOperatorCallExprClass:
1193 case CXXMemberCallExprClass: {
1194 // C++0x [expr.call]p10
1195 // A function call is an lvalue if and only if the result type
1196 // is an lvalue reference.
1197 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType();
1198 if (ReturnType->isLValueReferenceType())
1201 // If the function is returning a class temporary, make a note of
1203 if (Ctx.getLangOptions().CPlusPlus && ReturnType->isRecordType())
1204 return LV_ClassTemporary;
1208 case CompoundLiteralExprClass: // C99 6.5.2.5p5
1209 // FIXME: Is this what we want in C++?
1211 case ChooseExprClass:
1212 // __builtin_choose_expr is an lvalue if the selected operand is.
1213 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx);
1214 case ExtVectorElementExprClass:
1215 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements())
1216 return LV_DuplicateVectorComponents;
1218 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues.
1220 case ObjCPropertyRefExprClass: // FIXME: check if read-only property.
1222 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property.
1224 case PredefinedExprClass:
1226 case UnresolvedLookupExprClass:
1228 case CXXDefaultArgExprClass:
1229 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx);
1230 case CStyleCastExprClass:
1231 case CXXFunctionalCastExprClass:
1232 case CXXStaticCastExprClass:
1233 case CXXDynamicCastExprClass:
1234 case CXXReinterpretCastExprClass:
1235 case CXXConstCastExprClass:
1236 // The result of an explicit cast is an lvalue if the type we are
1237 // casting to is an lvalue reference type. See C++ [expr.cast]p1,
1238 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2,
1239 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1.
1240 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()->
1241 isLValueReferenceType())
1244 // If this is a conversion to a class temporary, make a note of
1246 if (Ctx.getLangOptions().CPlusPlus &&
1247 cast<ExplicitCastExpr>(this)->getTypeAsWritten()->isRecordType())
1248 return LV_ClassTemporary;
1251 case CXXTypeidExprClass:
1252 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ...
1254 case CXXBindTemporaryExprClass:
1255 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()->
1256 isLvalueInternal(Ctx);
1257 case CXXBindReferenceExprClass:
1258 // Something that's bound to a reference is always an lvalue.
1260 case ConditionalOperatorClass: {
1261 // Complicated handling is only for C++.
1262 if (!Ctx.getLangOptions().CPlusPlus)
1263 return LV_InvalidExpression;
1265 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is
1266 // everywhere there's an object converted to an rvalue. Also, any other
1267 // casts should be wrapped by ImplicitCastExprs. There's just the special
1268 // case involving throws to work out.
1269 const ConditionalOperator *Cond = cast<ConditionalOperator>(this);
1270 Expr *True = Cond->getTrueExpr();
1271 Expr *False = Cond->getFalseExpr();
1273 // If either the second or the third operand has type (cv) void, [...]
1274 // the result [...] is an rvalue.
1275 if (True->getType()->isVoidType() || False->getType()->isVoidType())
1276 return LV_InvalidExpression;
1278 // Both sides must be lvalues for the result to be an lvalue.
1279 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid)
1280 return LV_InvalidExpression;
1286 case Expr::CXXExprWithTemporariesClass:
1287 return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx);
1289 case Expr::ObjCMessageExprClass:
1290 if (const ObjCMethodDecl *Method
1291 = cast<ObjCMessageExpr>(this)->getMethodDecl())
1292 if (Method->getResultType()->isLValueReferenceType())
1296 case Expr::CXXConstructExprClass:
1297 case Expr::CXXTemporaryObjectExprClass:
1298 case Expr::CXXZeroInitValueExprClass:
1299 return LV_ClassTemporary;
1304 return LV_InvalidExpression;
1307 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
1308 /// does not have an incomplete type, does not have a const-qualified type, and
1309 /// if it is a structure or union, does not have any member (including,
1310 /// recursively, any member or element of all contained aggregates or unions)
1311 /// with a const-qualified type.
1312 Expr::isModifiableLvalueResult
1313 Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const {
1314 isLvalueResult lvalResult = isLvalue(Ctx);
1316 switch (lvalResult) {
1318 // C++ 3.10p11: Functions cannot be modified, but pointers to
1319 // functions can be modifiable.
1320 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType())
1321 return MLV_NotObjectType;
1324 case LV_NotObjectType: return MLV_NotObjectType;
1325 case LV_IncompleteVoidType: return MLV_IncompleteVoidType;
1326 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents;
1327 case LV_InvalidExpression:
1328 // If the top level is a C-style cast, and the subexpression is a valid
1329 // lvalue, then this is probably a use of the old-school "cast as lvalue"
1330 // GCC extension. We don't support it, but we want to produce good
1331 // diagnostics when it happens so that the user knows why.
1332 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) {
1333 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) {
1335 *Loc = CE->getLParenLoc();
1336 return MLV_LValueCast;
1339 return MLV_InvalidExpression;
1340 case LV_MemberFunction: return MLV_MemberFunction;
1341 case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting;
1342 case LV_ClassTemporary:
1343 return MLV_ClassTemporary;
1346 // The following is illegal:
1347 // void takeclosure(void (^C)(void));
1348 // void func() { int x = 1; takeclosure(^{ x = 7; }); }
1350 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) {
1351 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl()))
1352 return MLV_NotBlockQualified;
1355 // Assigning to an 'implicit' property?
1356 if (const ObjCImplicitSetterGetterRefExpr* Expr =
1357 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) {
1358 if (Expr->getSetterMethod() == 0)
1359 return MLV_NoSetterProperty;
1362 QualType CT = Ctx.getCanonicalType(getType());
1364 if (CT.isConstQualified())
1365 return MLV_ConstQualified;
1366 if (CT->isArrayType())
1367 return MLV_ArrayType;
1368 if (CT->isIncompleteType())
1369 return MLV_IncompleteType;
1371 if (const RecordType *r = CT->getAs<RecordType>()) {
1372 if (r->hasConstFields())
1373 return MLV_ConstQualified;
1379 /// isOBJCGCCandidate - Check if an expression is objc gc'able.
1380 /// returns true, if it is; false otherwise.
1381 bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
1382 switch (getStmtClass()) {
1385 case ObjCIvarRefExprClass:
1387 case Expr::UnaryOperatorClass:
1388 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1389 case ParenExprClass:
1390 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1391 case ImplicitCastExprClass:
1392 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1393 case CStyleCastExprClass:
1394 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1395 case DeclRefExprClass: {
1396 const Decl *D = cast<DeclRefExpr>(this)->getDecl();
1397 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1398 if (VD->hasGlobalStorage())
1400 QualType T = VD->getType();
1401 // dereferencing to a pointer is always a gc'able candidate,
1402 // unless it is __weak.
1403 return T->isPointerType() &&
1404 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak);
1408 case MemberExprClass: {
1409 const MemberExpr *M = cast<MemberExpr>(this);
1410 return M->getBase()->isOBJCGCCandidate(Ctx);
1412 case ArraySubscriptExprClass:
1413 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx);
1416 Expr* Expr::IgnoreParens() {
1418 while (ParenExpr* P = dyn_cast<ParenExpr>(E))
1419 E = P->getSubExpr();
1424 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr
1425 /// or CastExprs or ImplicitCastExprs, returning their operand.
1426 Expr *Expr::IgnoreParenCasts() {
1429 if (ParenExpr *P = dyn_cast<ParenExpr>(E))
1430 E = P->getSubExpr();
1431 else if (CastExpr *P = dyn_cast<CastExpr>(E))
1432 E = P->getSubExpr();
1438 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the
1439 /// value (including ptr->int casts of the same size). Strip off any
1440 /// ParenExpr or CastExprs, returning their operand.
1441 Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) {
1444 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
1445 E = P->getSubExpr();
1449 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
1450 // We ignore integer <-> casts that are of the same width, ptr<->ptr and
1451 // ptr<->int casts of the same width. We also ignore all identify casts.
1452 Expr *SE = P->getSubExpr();
1454 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) {
1459 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) &&
1460 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) &&
1461 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) {
1471 bool Expr::isDefaultArgument() const {
1472 const Expr *E = this;
1473 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
1474 E = ICE->getSubExprAsWritten();
1476 return isa<CXXDefaultArgExpr>(E);
1479 /// hasAnyTypeDependentArguments - Determines if any of the expressions
1480 /// in Exprs is type-dependent.
1481 bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) {
1482 for (unsigned I = 0; I < NumExprs; ++I)
1483 if (Exprs[I]->isTypeDependent())
1489 /// hasAnyValueDependentArguments - Determines if any of the expressions
1490 /// in Exprs is value-dependent.
1491 bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) {
1492 for (unsigned I = 0; I < NumExprs; ++I)
1493 if (Exprs[I]->isValueDependent())
1499 bool Expr::isConstantInitializer(ASTContext &Ctx) const {
1500 // This function is attempting whether an expression is an initializer
1501 // which can be evaluated at compile-time. isEvaluatable handles most
1502 // of the cases, but it can't deal with some initializer-specific
1503 // expressions, and it can't deal with aggregates; we deal with those here,
1504 // and fall back to isEvaluatable for the other cases.
1506 // FIXME: This function assumes the variable being assigned to
1507 // isn't a reference type!
1509 switch (getStmtClass()) {
1511 case StringLiteralClass:
1512 case ObjCStringLiteralClass:
1513 case ObjCEncodeExprClass:
1515 case CompoundLiteralExprClass: {
1516 // This handles gcc's extension that allows global initializers like
1517 // "struct x {int x;} x = (struct x) {};".
1518 // FIXME: This accepts other cases it shouldn't!
1519 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer();
1520 return Exp->isConstantInitializer(Ctx);
1522 case InitListExprClass: {
1523 // FIXME: This doesn't deal with fields with reference types correctly.
1524 // FIXME: This incorrectly allows pointers cast to integers to be assigned
1526 const InitListExpr *Exp = cast<InitListExpr>(this);
1527 unsigned numInits = Exp->getNumInits();
1528 for (unsigned i = 0; i < numInits; i++) {
1529 if (!Exp->getInit(i)->isConstantInitializer(Ctx))
1534 case ImplicitValueInitExprClass:
1536 case ParenExprClass:
1537 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
1538 case UnaryOperatorClass: {
1539 const UnaryOperator* Exp = cast<UnaryOperator>(this);
1540 if (Exp->getOpcode() == UnaryOperator::Extension)
1541 return Exp->getSubExpr()->isConstantInitializer(Ctx);
1544 case BinaryOperatorClass: {
1545 // Special case &&foo - &&bar. It would be nice to generalize this somehow
1546 // but this handles the common case.
1547 const BinaryOperator *Exp = cast<BinaryOperator>(this);
1548 if (Exp->getOpcode() == BinaryOperator::Sub &&
1549 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) &&
1550 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx)))
1554 case ImplicitCastExprClass:
1555 case CStyleCastExprClass:
1556 // Handle casts with a destination that's a struct or union; this
1557 // deals with both the gcc no-op struct cast extension and the
1558 // cast-to-union extension.
1559 if (getType()->isRecordType())
1560 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
1562 // Integer->integer casts can be handled here, which is important for
1563 // things like (int)(&&x-&&y). Scary but true.
1564 if (getType()->isIntegerType() &&
1565 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType())
1566 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
1570 return isEvaluatable(Ctx);
1573 /// isIntegerConstantExpr - this recursive routine will test if an expression is
1574 /// an integer constant expression.
1576 /// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero,
1579 /// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof
1580 /// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer
1581 /// cast+dereference.
1583 // CheckICE - This function does the fundamental ICE checking: the returned
1584 // ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation.
1585 // Note that to reduce code duplication, this helper does no evaluation
1586 // itself; the caller checks whether the expression is evaluatable, and
1587 // in the rare cases where CheckICE actually cares about the evaluated
1588 // value, it calls into Evalute.
1591 // 0: This expression is an ICE if it can be evaluated by Evaluate.
1592 // 1: This expression is not an ICE, but if it isn't evaluated, it's
1593 // a legal subexpression for an ICE. This return value is used to handle
1594 // the comma operator in C99 mode.
1595 // 2: This expression is not an ICE, and is not a legal subexpression for one.
1602 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {}
1603 ICEDiag() : Val(0) {}
1606 ICEDiag NoDiag() { return ICEDiag(); }
1608 static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) {
1609 Expr::EvalResult EVResult;
1610 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects ||
1611 !EVResult.Val.isInt()) {
1612 return ICEDiag(2, E->getLocStart());
1617 static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) {
1618 assert(!E->isValueDependent() && "Should not see value dependent exprs!");
1619 if (!E->getType()->isIntegralType()) {
1620 return ICEDiag(2, E->getLocStart());
1623 switch (E->getStmtClass()) {
1624 #define STMT(Node, Base) case Expr::Node##Class:
1625 #define EXPR(Node, Base)
1626 #include "clang/AST/StmtNodes.def"
1627 case Expr::PredefinedExprClass:
1628 case Expr::FloatingLiteralClass:
1629 case Expr::ImaginaryLiteralClass:
1630 case Expr::StringLiteralClass:
1631 case Expr::ArraySubscriptExprClass:
1632 case Expr::MemberExprClass:
1633 case Expr::CompoundAssignOperatorClass:
1634 case Expr::CompoundLiteralExprClass:
1635 case Expr::ExtVectorElementExprClass:
1636 case Expr::InitListExprClass:
1637 case Expr::DesignatedInitExprClass:
1638 case Expr::ImplicitValueInitExprClass:
1639 case Expr::ParenListExprClass:
1640 case Expr::VAArgExprClass:
1641 case Expr::AddrLabelExprClass:
1642 case Expr::StmtExprClass:
1643 case Expr::CXXMemberCallExprClass:
1644 case Expr::CXXDynamicCastExprClass:
1645 case Expr::CXXTypeidExprClass:
1646 case Expr::CXXNullPtrLiteralExprClass:
1647 case Expr::CXXThisExprClass:
1648 case Expr::CXXThrowExprClass:
1649 case Expr::CXXNewExprClass:
1650 case Expr::CXXDeleteExprClass:
1651 case Expr::CXXPseudoDestructorExprClass:
1652 case Expr::UnresolvedLookupExprClass:
1653 case Expr::DependentScopeDeclRefExprClass:
1654 case Expr::CXXConstructExprClass:
1655 case Expr::CXXBindTemporaryExprClass:
1656 case Expr::CXXBindReferenceExprClass:
1657 case Expr::CXXExprWithTemporariesClass:
1658 case Expr::CXXTemporaryObjectExprClass:
1659 case Expr::CXXUnresolvedConstructExprClass:
1660 case Expr::CXXDependentScopeMemberExprClass:
1661 case Expr::UnresolvedMemberExprClass:
1662 case Expr::ObjCStringLiteralClass:
1663 case Expr::ObjCEncodeExprClass:
1664 case Expr::ObjCMessageExprClass:
1665 case Expr::ObjCSelectorExprClass:
1666 case Expr::ObjCProtocolExprClass:
1667 case Expr::ObjCIvarRefExprClass:
1668 case Expr::ObjCPropertyRefExprClass:
1669 case Expr::ObjCImplicitSetterGetterRefExprClass:
1670 case Expr::ObjCSuperExprClass:
1671 case Expr::ObjCIsaExprClass:
1672 case Expr::ShuffleVectorExprClass:
1673 case Expr::BlockExprClass:
1674 case Expr::BlockDeclRefExprClass:
1675 case Expr::NoStmtClass:
1676 return ICEDiag(2, E->getLocStart());
1678 case Expr::GNUNullExprClass:
1679 // GCC considers the GNU __null value to be an integral constant expression.
1682 case Expr::ParenExprClass:
1683 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx);
1684 case Expr::IntegerLiteralClass:
1685 case Expr::CharacterLiteralClass:
1686 case Expr::CXXBoolLiteralExprClass:
1687 case Expr::CXXZeroInitValueExprClass:
1688 case Expr::TypesCompatibleExprClass:
1689 case Expr::UnaryTypeTraitExprClass:
1691 case Expr::CallExprClass:
1692 case Expr::CXXOperatorCallExprClass: {
1693 const CallExpr *CE = cast<CallExpr>(E);
1694 if (CE->isBuiltinCall(Ctx))
1695 return CheckEvalInICE(E, Ctx);
1696 return ICEDiag(2, E->getLocStart());
1698 case Expr::DeclRefExprClass:
1699 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl()))
1701 if (Ctx.getLangOptions().CPlusPlus &&
1702 E->getType().getCVRQualifiers() == Qualifiers::Const) {
1703 const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl();
1705 // Parameter variables are never constants. Without this check,
1706 // getAnyInitializer() can find a default argument, which leads
1708 if (isa<ParmVarDecl>(D))
1709 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation());
1712 // A variable of non-volatile const-qualified integral or enumeration
1713 // type initialized by an ICE can be used in ICEs.
1714 if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) {
1715 Qualifiers Quals = Ctx.getCanonicalType(Dcl->getType()).getQualifiers();
1716 if (Quals.hasVolatile() || !Quals.hasConst())
1717 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation());
1719 // Look for a declaration of this variable that has an initializer.
1720 const VarDecl *ID = 0;
1721 const Expr *Init = Dcl->getAnyInitializer(ID);
1723 if (ID->isInitKnownICE()) {
1724 // We have already checked whether this subexpression is an
1725 // integral constant expression.
1726 if (ID->isInitICE())
1729 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation());
1732 // It's an ICE whether or not the definition we found is
1733 // out-of-line. See DR 721 and the discussion in Clang PR
1734 // 6206 for details.
1736 if (Dcl->isCheckingICE()) {
1737 return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation());
1740 Dcl->setCheckingICE();
1741 ICEDiag Result = CheckICE(Init, Ctx);
1742 // Cache the result of the ICE test.
1743 Dcl->setInitKnownICE(Result.Val == 0);
1748 return ICEDiag(2, E->getLocStart());
1749 case Expr::UnaryOperatorClass: {
1750 const UnaryOperator *Exp = cast<UnaryOperator>(E);
1751 switch (Exp->getOpcode()) {
1752 case UnaryOperator::PostInc:
1753 case UnaryOperator::PostDec:
1754 case UnaryOperator::PreInc:
1755 case UnaryOperator::PreDec:
1756 case UnaryOperator::AddrOf:
1757 case UnaryOperator::Deref:
1758 return ICEDiag(2, E->getLocStart());
1760 case UnaryOperator::Extension:
1761 case UnaryOperator::LNot:
1762 case UnaryOperator::Plus:
1763 case UnaryOperator::Minus:
1764 case UnaryOperator::Not:
1765 case UnaryOperator::Real:
1766 case UnaryOperator::Imag:
1767 return CheckICE(Exp->getSubExpr(), Ctx);
1768 case UnaryOperator::OffsetOf:
1769 // Note that per C99, offsetof must be an ICE. And AFAIK, using
1770 // Evaluate matches the proposed gcc behavior for cases like
1771 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect
1772 // compliance: we should warn earlier for offsetof expressions with
1773 // array subscripts that aren't ICEs, and if the array subscripts
1774 // are ICEs, the value of the offsetof must be an integer constant.
1775 return CheckEvalInICE(E, Ctx);
1778 case Expr::SizeOfAlignOfExprClass: {
1779 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E);
1780 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType())
1781 return ICEDiag(2, E->getLocStart());
1784 case Expr::BinaryOperatorClass: {
1785 const BinaryOperator *Exp = cast<BinaryOperator>(E);
1786 switch (Exp->getOpcode()) {
1787 case BinaryOperator::PtrMemD:
1788 case BinaryOperator::PtrMemI:
1789 case BinaryOperator::Assign:
1790 case BinaryOperator::MulAssign:
1791 case BinaryOperator::DivAssign:
1792 case BinaryOperator::RemAssign:
1793 case BinaryOperator::AddAssign:
1794 case BinaryOperator::SubAssign:
1795 case BinaryOperator::ShlAssign:
1796 case BinaryOperator::ShrAssign:
1797 case BinaryOperator::AndAssign:
1798 case BinaryOperator::XorAssign:
1799 case BinaryOperator::OrAssign:
1800 return ICEDiag(2, E->getLocStart());
1802 case BinaryOperator::Mul:
1803 case BinaryOperator::Div:
1804 case BinaryOperator::Rem:
1805 case BinaryOperator::Add:
1806 case BinaryOperator::Sub:
1807 case BinaryOperator::Shl:
1808 case BinaryOperator::Shr:
1809 case BinaryOperator::LT:
1810 case BinaryOperator::GT:
1811 case BinaryOperator::LE:
1812 case BinaryOperator::GE:
1813 case BinaryOperator::EQ:
1814 case BinaryOperator::NE:
1815 case BinaryOperator::And:
1816 case BinaryOperator::Xor:
1817 case BinaryOperator::Or:
1818 case BinaryOperator::Comma: {
1819 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
1820 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
1821 if (Exp->getOpcode() == BinaryOperator::Div ||
1822 Exp->getOpcode() == BinaryOperator::Rem) {
1823 // Evaluate gives an error for undefined Div/Rem, so make sure
1824 // we don't evaluate one.
1825 if (LHSResult.Val != 2 && RHSResult.Val != 2) {
1826 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx);
1828 return ICEDiag(1, E->getLocStart());
1829 if (REval.isSigned() && REval.isAllOnesValue()) {
1830 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx);
1831 if (LEval.isMinSignedValue())
1832 return ICEDiag(1, E->getLocStart());
1836 if (Exp->getOpcode() == BinaryOperator::Comma) {
1837 if (Ctx.getLangOptions().C99) {
1838 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE
1839 // if it isn't evaluated.
1840 if (LHSResult.Val == 0 && RHSResult.Val == 0)
1841 return ICEDiag(1, E->getLocStart());
1843 // In both C89 and C++, commas in ICEs are illegal.
1844 return ICEDiag(2, E->getLocStart());
1847 if (LHSResult.Val >= RHSResult.Val)
1851 case BinaryOperator::LAnd:
1852 case BinaryOperator::LOr: {
1853 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
1854 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
1855 if (LHSResult.Val == 0 && RHSResult.Val == 1) {
1856 // Rare case where the RHS has a comma "side-effect"; we need
1857 // to actually check the condition to see whether the side
1858 // with the comma is evaluated.
1859 if ((Exp->getOpcode() == BinaryOperator::LAnd) !=
1860 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0))
1865 if (LHSResult.Val >= RHSResult.Val)
1871 case Expr::ImplicitCastExprClass:
1872 case Expr::CStyleCastExprClass:
1873 case Expr::CXXFunctionalCastExprClass:
1874 case Expr::CXXNamedCastExprClass:
1875 case Expr::CXXStaticCastExprClass:
1876 case Expr::CXXReinterpretCastExprClass:
1877 case Expr::CXXConstCastExprClass: {
1878 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr();
1879 if (SubExpr->getType()->isIntegralType())
1880 return CheckICE(SubExpr, Ctx);
1881 if (isa<FloatingLiteral>(SubExpr->IgnoreParens()))
1883 return ICEDiag(2, E->getLocStart());
1885 case Expr::ConditionalOperatorClass: {
1886 const ConditionalOperator *Exp = cast<ConditionalOperator>(E);
1887 // If the condition (ignoring parens) is a __builtin_constant_p call,
1888 // then only the true side is actually considered in an integer constant
1889 // expression, and it is fully evaluated. This is an important GNU
1890 // extension. See GCC PR38377 for discussion.
1891 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts()))
1892 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) {
1893 Expr::EvalResult EVResult;
1894 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects ||
1895 !EVResult.Val.isInt()) {
1896 return ICEDiag(2, E->getLocStart());
1900 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx);
1901 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx);
1902 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx);
1903 if (CondResult.Val == 2)
1905 if (TrueResult.Val == 2)
1907 if (FalseResult.Val == 2)
1909 if (CondResult.Val == 1)
1911 if (TrueResult.Val == 0 && FalseResult.Val == 0)
1913 // Rare case where the diagnostics depend on which side is evaluated
1914 // Note that if we get here, CondResult is 0, and at least one of
1915 // TrueResult and FalseResult is non-zero.
1916 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) {
1921 case Expr::CXXDefaultArgExprClass:
1922 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx);
1923 case Expr::ChooseExprClass: {
1924 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx);
1928 // Silence a GCC warning
1929 return ICEDiag(2, E->getLocStart());
1932 bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx,
1933 SourceLocation *Loc, bool isEvaluated) const {
1934 ICEDiag d = CheckICE(this, Ctx);
1936 if (Loc) *Loc = d.Loc;
1939 EvalResult EvalResult;
1940 if (!Evaluate(EvalResult, Ctx))
1941 llvm_unreachable("ICE cannot be evaluated!");
1942 assert(!EvalResult.HasSideEffects && "ICE with side effects!");
1943 assert(EvalResult.Val.isInt() && "ICE that isn't integer!");
1944 Result = EvalResult.Val.getInt();
1948 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an
1949 /// integer constant expression with the value zero, or if this is one that is
1951 bool Expr::isNullPointerConstant(ASTContext &Ctx,
1952 NullPointerConstantValueDependence NPC) const {
1953 if (isValueDependent()) {
1955 case NPC_NeverValueDependent:
1956 assert(false && "Unexpected value dependent expression!");
1957 // If the unthinkable happens, fall through to the safest alternative.
1959 case NPC_ValueDependentIsNull:
1960 return isTypeDependent() || getType()->isIntegralType();
1962 case NPC_ValueDependentIsNotNull:
1967 // Strip off a cast to void*, if it exists. Except in C++.
1968 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) {
1969 if (!Ctx.getLangOptions().CPlusPlus) {
1970 // Check that it is a cast to void*.
1971 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
1972 QualType Pointee = PT->getPointeeType();
1973 if (!Pointee.hasQualifiers() &&
1974 Pointee->isVoidType() && // to void*
1975 CE->getSubExpr()->getType()->isIntegerType()) // from int.
1976 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
1979 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) {
1980 // Ignore the ImplicitCastExpr type entirely.
1981 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
1982 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) {
1983 // Accept ((void*)0) as a null pointer constant, as many other
1984 // implementations do.
1985 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
1986 } else if (const CXXDefaultArgExpr *DefaultArg
1987 = dyn_cast<CXXDefaultArgExpr>(this)) {
1988 // See through default argument expressions
1989 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
1990 } else if (isa<GNUNullExpr>(this)) {
1991 // The GNU __null extension is always a null pointer constant.
1995 // C++0x nullptr_t is always a null pointer constant.
1996 if (getType()->isNullPtrType())
1999 // This expression must be an integer type.
2000 if (!getType()->isIntegerType() ||
2001 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType()))
2004 // If we have an integer constant expression, we need to *evaluate* it and
2005 // test for the value 0.
2006 llvm::APSInt Result;
2007 return isIntegerConstantExpr(Result, Ctx) && Result == 0;
2010 FieldDecl *Expr::getBitField() {
2011 Expr *E = this->IgnoreParens();
2013 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2014 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp)
2015 E = ICE->getSubExpr()->IgnoreParens();
2020 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E))
2021 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl()))
2022 if (Field->isBitField())
2025 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E))
2026 if (BinOp->isAssignmentOp() && BinOp->getLHS())
2027 return BinOp->getLHS()->getBitField();
2032 bool Expr::refersToVectorElement() const {
2033 const Expr *E = this->IgnoreParens();
2035 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2036 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp)
2037 E = ICE->getSubExpr()->IgnoreParens();
2042 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E))
2043 return ASE->getBase()->getType()->isVectorType();
2045 if (isa<ExtVectorElementExpr>(E))
2051 /// isArrow - Return true if the base expression is a pointer to vector,
2052 /// return false if the base expression is a vector.
2053 bool ExtVectorElementExpr::isArrow() const {
2054 return getBase()->getType()->isPointerType();
2057 unsigned ExtVectorElementExpr::getNumElements() const {
2058 if (const VectorType *VT = getType()->getAs<VectorType>())
2059 return VT->getNumElements();
2063 /// containsDuplicateElements - Return true if any element access is repeated.
2064 bool ExtVectorElementExpr::containsDuplicateElements() const {
2065 // FIXME: Refactor this code to an accessor on the AST node which returns the
2066 // "type" of component access, and share with code below and in Sema.
2067 llvm::StringRef Comp = Accessor->getName();
2069 // Halving swizzles do not contain duplicate elements.
2070 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
2073 // Advance past s-char prefix on hex swizzles.
2074 if (Comp[0] == 's' || Comp[0] == 'S')
2075 Comp = Comp.substr(1);
2077 for (unsigned i = 0, e = Comp.size(); i != e; ++i)
2078 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos)
2084 /// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
2085 void ExtVectorElementExpr::getEncodedElementAccess(
2086 llvm::SmallVectorImpl<unsigned> &Elts) const {
2087 llvm::StringRef Comp = Accessor->getName();
2088 if (Comp[0] == 's' || Comp[0] == 'S')
2089 Comp = Comp.substr(1);
2091 bool isHi = Comp == "hi";
2092 bool isLo = Comp == "lo";
2093 bool isEven = Comp == "even";
2094 bool isOdd = Comp == "odd";
2096 for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
2108 Index = ExtVectorType::getAccessorIdx(Comp[i]);
2110 Elts.push_back(Index);
2114 // constructor for instance messages.
2115 ObjCMessageExpr::ObjCMessageExpr(ASTContext &C, Expr *receiver,
2117 QualType retType, ObjCMethodDecl *mproto,
2118 SourceLocation LBrac, SourceLocation RBrac,
2119 Expr **ArgExprs, unsigned nargs)
2120 : Expr(ObjCMessageExprClass, retType, false, false), SelName(selInfo),
2121 MethodProto(mproto) {
2123 SubExprs = new (C) Stmt*[NumArgs+1];
2124 SubExprs[RECEIVER] = receiver;
2126 for (unsigned i = 0; i != NumArgs; ++i)
2127 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
2133 // constructor for class messages.
2134 // FIXME: clsName should be typed to ObjCInterfaceType
2135 ObjCMessageExpr::ObjCMessageExpr(ASTContext &C, IdentifierInfo *clsName,
2136 SourceLocation clsNameLoc, Selector selInfo,
2137 QualType retType, ObjCMethodDecl *mproto,
2138 SourceLocation LBrac, SourceLocation RBrac,
2139 Expr **ArgExprs, unsigned nargs)
2140 : Expr(ObjCMessageExprClass, retType, false, false), ClassNameLoc(clsNameLoc),
2141 SelName(selInfo), MethodProto(mproto) {
2143 SubExprs = new (C) Stmt*[NumArgs+1];
2144 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown);
2146 for (unsigned i = 0; i != NumArgs; ++i)
2147 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
2153 // constructor for class messages.
2154 ObjCMessageExpr::ObjCMessageExpr(ASTContext &C, ObjCInterfaceDecl *cls,
2155 SourceLocation clsNameLoc, Selector selInfo,
2157 ObjCMethodDecl *mproto, SourceLocation LBrac,
2158 SourceLocation RBrac, Expr **ArgExprs,
2160 : Expr(ObjCMessageExprClass, retType, false, false), ClassNameLoc(clsNameLoc),
2161 SelName(selInfo), MethodProto(mproto)
2164 SubExprs = new (C) Stmt*[NumArgs+1];
2165 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown);
2167 for (unsigned i = 0; i != NumArgs; ++i)
2168 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
2174 ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const {
2175 uintptr_t x = (uintptr_t) SubExprs[RECEIVER];
2176 switch (x & Flags) {
2178 assert(false && "Invalid ObjCMessageExpr.");
2180 return ClassInfo(0, 0, SourceLocation());
2181 case IsClsMethDeclUnknown:
2182 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags), ClassNameLoc);
2183 case IsClsMethDeclKnown: {
2184 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags);
2185 return ClassInfo(D, D->getIdentifier(), ClassNameLoc);
2190 void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) {
2191 if (CI.Decl == 0 && CI.Name == 0) {
2192 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth);
2197 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.Name | IsClsMethDeclUnknown);
2199 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.Decl | IsClsMethDeclKnown);
2200 ClassNameLoc = CI.Loc;
2203 void ObjCMessageExpr::DoDestroy(ASTContext &C) {
2206 C.Deallocate(SubExprs);
2207 this->~ObjCMessageExpr();
2208 C.Deallocate((void*) this);
2211 bool ChooseExpr::isConditionTrue(ASTContext &C) const {
2212 return getCond()->EvaluateAsInt(C) != 0;
2215 void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs,
2216 unsigned NumExprs) {
2217 if (SubExprs) C.Deallocate(SubExprs);
2219 SubExprs = new (C) Stmt* [NumExprs];
2220 this->NumExprs = NumExprs;
2221 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs);
2224 void ShuffleVectorExpr::DoDestroy(ASTContext& C) {
2226 if (SubExprs) C.Deallocate(SubExprs);
2227 this->~ShuffleVectorExpr();
2231 void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) {
2232 // Override default behavior of traversing children. If this has a type
2233 // operand and the type is a variable-length array, the child iteration
2234 // will iterate over the size expression. However, this expression belongs
2235 // to the type, not to this, so we don't want to delete it.
2236 // We still want to delete this expression.
2237 if (isArgumentType()) {
2238 this->~SizeOfAlignOfExpr();
2245 //===----------------------------------------------------------------------===//
2246 // DesignatedInitExpr
2247 //===----------------------------------------------------------------------===//
2249 IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() {
2250 assert(Kind == FieldDesignator && "Only valid on a field designator");
2251 if (Field.NameOrField & 0x01)
2252 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01);
2254 return getField()->getIdentifier();
2257 DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty,
2258 unsigned NumDesignators,
2259 const Designator *Designators,
2260 SourceLocation EqualOrColonLoc,
2263 unsigned NumIndexExprs,
2265 : Expr(DesignatedInitExprClass, Ty,
2266 Init->isTypeDependent(), Init->isValueDependent()),
2267 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
2268 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) {
2269 this->Designators = new (C) Designator[NumDesignators];
2271 // Record the initializer itself.
2272 child_iterator Child = child_begin();
2275 // Copy the designators and their subexpressions, computing
2276 // value-dependence along the way.
2277 unsigned IndexIdx = 0;
2278 for (unsigned I = 0; I != NumDesignators; ++I) {
2279 this->Designators[I] = Designators[I];
2281 if (this->Designators[I].isArrayDesignator()) {
2282 // Compute type- and value-dependence.
2283 Expr *Index = IndexExprs[IndexIdx];
2284 ValueDependent = ValueDependent ||
2285 Index->isTypeDependent() || Index->isValueDependent();
2287 // Copy the index expressions into permanent storage.
2288 *Child++ = IndexExprs[IndexIdx++];
2289 } else if (this->Designators[I].isArrayRangeDesignator()) {
2290 // Compute type- and value-dependence.
2291 Expr *Start = IndexExprs[IndexIdx];
2292 Expr *End = IndexExprs[IndexIdx + 1];
2293 ValueDependent = ValueDependent ||
2294 Start->isTypeDependent() || Start->isValueDependent() ||
2295 End->isTypeDependent() || End->isValueDependent();
2297 // Copy the start/end expressions into permanent storage.
2298 *Child++ = IndexExprs[IndexIdx++];
2299 *Child++ = IndexExprs[IndexIdx++];
2303 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions");
2306 DesignatedInitExpr *
2307 DesignatedInitExpr::Create(ASTContext &C, Designator *Designators,
2308 unsigned NumDesignators,
2309 Expr **IndexExprs, unsigned NumIndexExprs,
2310 SourceLocation ColonOrEqualLoc,
2311 bool UsesColonSyntax, Expr *Init) {
2312 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
2313 sizeof(Stmt *) * (NumIndexExprs + 1), 8);
2314 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators,
2315 ColonOrEqualLoc, UsesColonSyntax,
2316 IndexExprs, NumIndexExprs, Init);
2319 DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C,
2320 unsigned NumIndexExprs) {
2321 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
2322 sizeof(Stmt *) * (NumIndexExprs + 1), 8);
2323 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
2326 void DesignatedInitExpr::setDesignators(ASTContext &C,
2327 const Designator *Desigs,
2328 unsigned NumDesigs) {
2329 DestroyDesignators(C);
2331 Designators = new (C) Designator[NumDesigs];
2332 NumDesignators = NumDesigs;
2333 for (unsigned I = 0; I != NumDesigs; ++I)
2334 Designators[I] = Desigs[I];
2337 SourceRange DesignatedInitExpr::getSourceRange() const {
2338 SourceLocation StartLoc;
2340 *const_cast<DesignatedInitExpr*>(this)->designators_begin();
2341 if (First.isFieldDesignator()) {
2343 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc);
2345 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc);
2348 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc);
2349 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd());
2352 Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) {
2353 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator");
2354 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2355 Ptr += sizeof(DesignatedInitExpr);
2356 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2357 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
2360 Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) {
2361 assert(D.Kind == Designator::ArrayRangeDesignator &&
2362 "Requires array range designator");
2363 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2364 Ptr += sizeof(DesignatedInitExpr);
2365 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2366 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
2369 Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) {
2370 assert(D.Kind == Designator::ArrayRangeDesignator &&
2371 "Requires array range designator");
2372 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2373 Ptr += sizeof(DesignatedInitExpr);
2374 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2375 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2));
2378 /// \brief Replaces the designator at index @p Idx with the series
2379 /// of designators in [First, Last).
2380 void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx,
2381 const Designator *First,
2382 const Designator *Last) {
2383 unsigned NumNewDesignators = Last - First;
2384 if (NumNewDesignators == 0) {
2385 std::copy_backward(Designators + Idx + 1,
2386 Designators + NumDesignators,
2388 --NumNewDesignators;
2390 } else if (NumNewDesignators == 1) {
2391 Designators[Idx] = *First;
2395 Designator *NewDesignators
2396 = new (C) Designator[NumDesignators - 1 + NumNewDesignators];
2397 std::copy(Designators, Designators + Idx, NewDesignators);
2398 std::copy(First, Last, NewDesignators + Idx);
2399 std::copy(Designators + Idx + 1, Designators + NumDesignators,
2400 NewDesignators + Idx + NumNewDesignators);
2401 DestroyDesignators(C);
2402 Designators = NewDesignators;
2403 NumDesignators = NumDesignators - 1 + NumNewDesignators;
2406 void DesignatedInitExpr::DoDestroy(ASTContext &C) {
2407 DestroyDesignators(C);
2411 void DesignatedInitExpr::DestroyDesignators(ASTContext &C) {
2412 for (unsigned I = 0; I != NumDesignators; ++I)
2413 Designators[I].~Designator();
2414 C.Deallocate(Designators);
2418 ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc,
2419 Expr **exprs, unsigned nexprs,
2420 SourceLocation rparenloc)
2421 : Expr(ParenListExprClass, QualType(),
2422 hasAnyTypeDependentArguments(exprs, nexprs),
2423 hasAnyValueDependentArguments(exprs, nexprs)),
2424 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) {
2426 Exprs = new (C) Stmt*[nexprs];
2427 for (unsigned i = 0; i != nexprs; ++i)
2428 Exprs[i] = exprs[i];
2431 void ParenListExpr::DoDestroy(ASTContext& C) {
2433 if (Exprs) C.Deallocate(Exprs);
2434 this->~ParenListExpr();
2438 //===----------------------------------------------------------------------===//
2440 //===----------------------------------------------------------------------===//
2442 Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); }
2443 Expr* ExprIterator::operator*() const { return cast<Expr>(*I); }
2444 Expr* ExprIterator::operator->() const { return cast<Expr>(*I); }
2445 const Expr* ConstExprIterator::operator[](size_t idx) const {
2446 return cast<Expr>(I[idx]);
2448 const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); }
2449 const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); }
2451 //===----------------------------------------------------------------------===//
2452 // Child Iterators for iterating over subexpressions/substatements
2453 //===----------------------------------------------------------------------===//
2456 Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); }
2457 Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); }
2460 Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; }
2461 Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; }
2463 // ObjCPropertyRefExpr
2464 Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; }
2465 Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; }
2467 // ObjCImplicitSetterGetterRefExpr
2468 Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() {
2471 Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() {
2476 Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); }
2477 Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); }
2480 Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; }
2481 Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; }
2484 Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); }
2485 Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); }
2488 Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); }
2489 Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); }
2492 Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();}
2493 Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); }
2496 Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); }
2497 Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); }
2500 Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; }
2501 Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; }
2504 Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); }
2505 Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); }
2508 Stmt::child_iterator ParenExpr::child_begin() { return &Val; }
2509 Stmt::child_iterator ParenExpr::child_end() { return &Val+1; }
2512 Stmt::child_iterator UnaryOperator::child_begin() { return &Val; }
2513 Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; }
2515 // SizeOfAlignOfExpr
2516 Stmt::child_iterator SizeOfAlignOfExpr::child_begin() {
2517 // If this is of a type and the type is a VLA type (and not a typedef), the
2518 // size expression of the VLA needs to be treated as an executable expression.
2519 // Why isn't this weirdness documented better in StmtIterator?
2520 if (isArgumentType()) {
2521 if (VariableArrayType* T = dyn_cast<VariableArrayType>(
2522 getArgumentType().getTypePtr()))
2523 return child_iterator(T);
2524 return child_iterator();
2526 return child_iterator(&Argument.Ex);
2528 Stmt::child_iterator SizeOfAlignOfExpr::child_end() {
2529 if (isArgumentType())
2530 return child_iterator();
2531 return child_iterator(&Argument.Ex + 1);
2534 // ArraySubscriptExpr
2535 Stmt::child_iterator ArraySubscriptExpr::child_begin() {
2536 return &SubExprs[0];
2538 Stmt::child_iterator ArraySubscriptExpr::child_end() {
2539 return &SubExprs[0]+END_EXPR;
2543 Stmt::child_iterator CallExpr::child_begin() {
2544 return &SubExprs[0];
2546 Stmt::child_iterator CallExpr::child_end() {
2547 return &SubExprs[0]+NumArgs+ARGS_START;
2551 Stmt::child_iterator MemberExpr::child_begin() { return &Base; }
2552 Stmt::child_iterator MemberExpr::child_end() { return &Base+1; }
2554 // ExtVectorElementExpr
2555 Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; }
2556 Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; }
2558 // CompoundLiteralExpr
2559 Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; }
2560 Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; }
2563 Stmt::child_iterator CastExpr::child_begin() { return &Op; }
2564 Stmt::child_iterator CastExpr::child_end() { return &Op+1; }
2567 Stmt::child_iterator BinaryOperator::child_begin() {
2568 return &SubExprs[0];
2570 Stmt::child_iterator BinaryOperator::child_end() {
2571 return &SubExprs[0]+END_EXPR;
2574 // ConditionalOperator
2575 Stmt::child_iterator ConditionalOperator::child_begin() {
2576 return &SubExprs[0];
2578 Stmt::child_iterator ConditionalOperator::child_end() {
2579 return &SubExprs[0]+END_EXPR;
2583 Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); }
2584 Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); }
2587 Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; }
2588 Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; }
2590 // TypesCompatibleExpr
2591 Stmt::child_iterator TypesCompatibleExpr::child_begin() {
2592 return child_iterator();
2595 Stmt::child_iterator TypesCompatibleExpr::child_end() {
2596 return child_iterator();
2600 Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; }
2601 Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; }
2604 Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); }
2605 Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); }
2607 // ShuffleVectorExpr
2608 Stmt::child_iterator ShuffleVectorExpr::child_begin() {
2609 return &SubExprs[0];
2611 Stmt::child_iterator ShuffleVectorExpr::child_end() {
2612 return &SubExprs[0]+NumExprs;
2616 Stmt::child_iterator VAArgExpr::child_begin() { return &Val; }
2617 Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; }
2620 Stmt::child_iterator InitListExpr::child_begin() {
2621 return InitExprs.size() ? &InitExprs[0] : 0;
2623 Stmt::child_iterator InitListExpr::child_end() {
2624 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0;
2627 // DesignatedInitExpr
2628 Stmt::child_iterator DesignatedInitExpr::child_begin() {
2629 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2630 Ptr += sizeof(DesignatedInitExpr);
2631 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2633 Stmt::child_iterator DesignatedInitExpr::child_end() {
2634 return child_iterator(&*child_begin() + NumSubExprs);
2637 // ImplicitValueInitExpr
2638 Stmt::child_iterator ImplicitValueInitExpr::child_begin() {
2639 return child_iterator();
2642 Stmt::child_iterator ImplicitValueInitExpr::child_end() {
2643 return child_iterator();
2647 Stmt::child_iterator ParenListExpr::child_begin() {
2650 Stmt::child_iterator ParenListExpr::child_end() {
2651 return &Exprs[0]+NumExprs;
2654 // ObjCStringLiteral
2655 Stmt::child_iterator ObjCStringLiteral::child_begin() {
2658 Stmt::child_iterator ObjCStringLiteral::child_end() {
2663 Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); }
2664 Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); }
2667 Stmt::child_iterator ObjCSelectorExpr::child_begin() {
2668 return child_iterator();
2670 Stmt::child_iterator ObjCSelectorExpr::child_end() {
2671 return child_iterator();
2675 Stmt::child_iterator ObjCProtocolExpr::child_begin() {
2676 return child_iterator();
2678 Stmt::child_iterator ObjCProtocolExpr::child_end() {
2679 return child_iterator();
2683 Stmt::child_iterator ObjCMessageExpr::child_begin() {
2684 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START;
2686 Stmt::child_iterator ObjCMessageExpr::child_end() {
2687 return &SubExprs[0]+ARGS_START+getNumArgs();
2691 Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); }
2692 Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); }
2694 Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();}
2695 Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); }