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/Lex/LiteralSupport.h"
24 #include "clang/Lex/Lexer.h"
25 #include "clang/Basic/Builtins.h"
26 #include "clang/Basic/SourceManager.h"
27 #include "clang/Basic/TargetInfo.h"
28 #include "llvm/Support/ErrorHandling.h"
29 #include "llvm/Support/raw_ostream.h"
31 using namespace clang;
33 /// isKnownToHaveBooleanValue - Return true if this is an integer expression
34 /// that is known to return 0 or 1. This happens for _Bool/bool expressions
35 /// but also int expressions which are produced by things like comparisons in
37 bool Expr::isKnownToHaveBooleanValue() const {
38 // If this value has _Bool type, it is obvious 0/1.
39 if (getType()->isBooleanType()) return true;
40 // If this is a non-scalar-integer type, we don't care enough to try.
41 if (!getType()->isIntegralOrEnumerationType()) return false;
43 if (const ParenExpr *PE = dyn_cast<ParenExpr>(this))
44 return PE->getSubExpr()->isKnownToHaveBooleanValue();
46 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(this)) {
47 switch (UO->getOpcode()) {
50 return UO->getSubExpr()->isKnownToHaveBooleanValue();
56 // Only look through implicit casts. If the user writes
57 // '(int) (a && b)' treat it as an arbitrary int.
58 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(this))
59 return CE->getSubExpr()->isKnownToHaveBooleanValue();
61 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(this)) {
62 switch (BO->getOpcode()) {
63 default: return false;
64 case BO_LT: // Relational operators.
68 case BO_EQ: // Equality operators.
70 case BO_LAnd: // AND operator.
71 case BO_LOr: // Logical OR operator.
74 case BO_And: // Bitwise AND operator.
75 case BO_Xor: // Bitwise XOR operator.
76 case BO_Or: // Bitwise OR operator.
77 // Handle things like (x==2)|(y==12).
78 return BO->getLHS()->isKnownToHaveBooleanValue() &&
79 BO->getRHS()->isKnownToHaveBooleanValue();
83 return BO->getRHS()->isKnownToHaveBooleanValue();
87 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(this))
88 return CO->getTrueExpr()->isKnownToHaveBooleanValue() &&
89 CO->getFalseExpr()->isKnownToHaveBooleanValue();
94 // Amusing macro metaprogramming hack: check whether a class provides
95 // a more specific implementation of getExprLoc().
97 /// This implementation is used when a class provides a custom
98 /// implementation of getExprLoc.
99 template <class E, class T>
100 SourceLocation getExprLocImpl(const Expr *expr,
101 SourceLocation (T::*v)() const) {
102 return static_cast<const E*>(expr)->getExprLoc();
105 /// This implementation is used when a class doesn't provide
106 /// a custom implementation of getExprLoc. Overload resolution
107 /// should pick it over the implementation above because it's
108 /// more specialized according to function template partial ordering.
110 SourceLocation getExprLocImpl(const Expr *expr,
111 SourceLocation (Expr::*v)() const) {
112 return static_cast<const E*>(expr)->getSourceRange().getBegin();
116 SourceLocation Expr::getExprLoc() const {
117 switch (getStmtClass()) {
118 case Stmt::NoStmtClass: llvm_unreachable("statement without class");
119 #define ABSTRACT_STMT(type)
120 #define STMT(type, base) \
121 case Stmt::type##Class: llvm_unreachable(#type " is not an Expr"); break;
122 #define EXPR(type, base) \
123 case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc);
124 #include "clang/AST/StmtNodes.inc"
126 llvm_unreachable("unknown statement kind");
127 return SourceLocation();
130 //===----------------------------------------------------------------------===//
131 // Primary Expressions.
132 //===----------------------------------------------------------------------===//
134 void ExplicitTemplateArgumentList::initializeFrom(
135 const TemplateArgumentListInfo &Info) {
136 LAngleLoc = Info.getLAngleLoc();
137 RAngleLoc = Info.getRAngleLoc();
138 NumTemplateArgs = Info.size();
140 TemplateArgumentLoc *ArgBuffer = getTemplateArgs();
141 for (unsigned i = 0; i != NumTemplateArgs; ++i)
142 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
145 void ExplicitTemplateArgumentList::initializeFrom(
146 const TemplateArgumentListInfo &Info,
148 bool &ContainsUnexpandedParameterPack) {
149 LAngleLoc = Info.getLAngleLoc();
150 RAngleLoc = Info.getRAngleLoc();
151 NumTemplateArgs = Info.size();
153 TemplateArgumentLoc *ArgBuffer = getTemplateArgs();
154 for (unsigned i = 0; i != NumTemplateArgs; ++i) {
155 Dependent = Dependent || Info[i].getArgument().isDependent();
156 ContainsUnexpandedParameterPack
157 = ContainsUnexpandedParameterPack ||
158 Info[i].getArgument().containsUnexpandedParameterPack();
160 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
164 void ExplicitTemplateArgumentList::copyInto(
165 TemplateArgumentListInfo &Info) const {
166 Info.setLAngleLoc(LAngleLoc);
167 Info.setRAngleLoc(RAngleLoc);
168 for (unsigned I = 0; I != NumTemplateArgs; ++I)
169 Info.addArgument(getTemplateArgs()[I]);
172 std::size_t ExplicitTemplateArgumentList::sizeFor(unsigned NumTemplateArgs) {
173 return sizeof(ExplicitTemplateArgumentList) +
174 sizeof(TemplateArgumentLoc) * NumTemplateArgs;
177 std::size_t ExplicitTemplateArgumentList::sizeFor(
178 const TemplateArgumentListInfo &Info) {
179 return sizeFor(Info.size());
182 /// \brief Compute the type- and value-dependence of a declaration reference
183 /// based on the declaration being referenced.
184 static void computeDeclRefDependence(NamedDecl *D, QualType T,
186 bool &ValueDependent) {
187 TypeDependent = false;
188 ValueDependent = false;
191 // (TD) C++ [temp.dep.expr]p3:
192 // An id-expression is type-dependent if it contains:
196 // (VD) C++ [temp.dep.constexpr]p2:
197 // An identifier is value-dependent if it is:
199 // (TD) - an identifier that was declared with dependent type
200 // (VD) - a name declared with a dependent type,
201 if (T->isDependentType()) {
202 TypeDependent = true;
203 ValueDependent = true;
207 // (TD) - a conversion-function-id that specifies a dependent type
208 if (D->getDeclName().getNameKind()
209 == DeclarationName::CXXConversionFunctionName &&
210 D->getDeclName().getCXXNameType()->isDependentType()) {
211 TypeDependent = true;
212 ValueDependent = true;
215 // (VD) - the name of a non-type template parameter,
216 if (isa<NonTypeTemplateParmDecl>(D)) {
217 ValueDependent = true;
221 // (VD) - a constant with integral or enumeration type and is
222 // initialized with an expression that is value-dependent.
223 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
224 if (Var->getType()->isIntegralOrEnumerationType() &&
225 Var->getType().getCVRQualifiers() == Qualifiers::Const) {
226 if (const Expr *Init = Var->getAnyInitializer())
227 if (Init->isValueDependent())
228 ValueDependent = true;
231 // (VD) - FIXME: Missing from the standard:
232 // - a member function or a static data member of the current
234 else if (Var->isStaticDataMember() &&
235 Var->getDeclContext()->isDependentContext())
236 ValueDependent = true;
241 // (VD) - FIXME: Missing from the standard:
242 // - a member function or a static data member of the current
244 if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) {
245 ValueDependent = true;
250 void DeclRefExpr::computeDependence() {
251 bool TypeDependent = false;
252 bool ValueDependent = false;
253 computeDeclRefDependence(getDecl(), getType(), TypeDependent, ValueDependent);
255 // (TD) C++ [temp.dep.expr]p3:
256 // An id-expression is type-dependent if it contains:
260 // (VD) C++ [temp.dep.constexpr]p2:
261 // An identifier is value-dependent if it is:
262 if (!TypeDependent && !ValueDependent &&
263 hasExplicitTemplateArgs() &&
264 TemplateSpecializationType::anyDependentTemplateArguments(
266 getNumTemplateArgs())) {
267 TypeDependent = true;
268 ValueDependent = true;
271 ExprBits.TypeDependent = TypeDependent;
272 ExprBits.ValueDependent = ValueDependent;
274 // Is the declaration a parameter pack?
275 if (getDecl()->isParameterPack())
276 ExprBits.ContainsUnexpandedParameterPack = true;
279 DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier,
280 SourceRange QualifierRange,
281 ValueDecl *D, SourceLocation NameLoc,
282 const TemplateArgumentListInfo *TemplateArgs,
283 QualType T, ExprValueKind VK)
284 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false),
286 (Qualifier? HasQualifierFlag : 0) |
287 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)),
290 NameQualifier *NQ = getNameQualifier();
292 NQ->Range = QualifierRange;
296 getExplicitTemplateArgs().initializeFrom(*TemplateArgs);
301 DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier,
302 SourceRange QualifierRange,
303 ValueDecl *D, const DeclarationNameInfo &NameInfo,
304 const TemplateArgumentListInfo *TemplateArgs,
305 QualType T, ExprValueKind VK)
306 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false),
308 (Qualifier? HasQualifierFlag : 0) |
309 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)),
310 Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) {
312 NameQualifier *NQ = getNameQualifier();
314 NQ->Range = QualifierRange;
318 getExplicitTemplateArgs().initializeFrom(*TemplateArgs);
323 DeclRefExpr *DeclRefExpr::Create(ASTContext &Context,
324 NestedNameSpecifier *Qualifier,
325 SourceRange QualifierRange,
327 SourceLocation NameLoc,
330 const TemplateArgumentListInfo *TemplateArgs) {
331 return Create(Context, Qualifier, QualifierRange, D,
332 DeclarationNameInfo(D->getDeclName(), NameLoc),
333 T, VK, TemplateArgs);
336 DeclRefExpr *DeclRefExpr::Create(ASTContext &Context,
337 NestedNameSpecifier *Qualifier,
338 SourceRange QualifierRange,
340 const DeclarationNameInfo &NameInfo,
343 const TemplateArgumentListInfo *TemplateArgs) {
344 std::size_t Size = sizeof(DeclRefExpr);
346 Size += sizeof(NameQualifier);
349 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs);
351 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>());
352 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameInfo,
353 TemplateArgs, T, VK);
356 DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context,
358 bool HasExplicitTemplateArgs,
359 unsigned NumTemplateArgs) {
360 std::size_t Size = sizeof(DeclRefExpr);
362 Size += sizeof(NameQualifier);
364 if (HasExplicitTemplateArgs)
365 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs);
367 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>());
368 return new (Mem) DeclRefExpr(EmptyShell());
371 SourceRange DeclRefExpr::getSourceRange() const {
372 SourceRange R = getNameInfo().getSourceRange();
374 R.setBegin(getQualifierRange().getBegin());
375 if (hasExplicitTemplateArgs())
376 R.setEnd(getRAngleLoc());
380 // FIXME: Maybe this should use DeclPrinter with a special "print predefined
381 // expr" policy instead.
382 std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) {
383 ASTContext &Context = CurrentDecl->getASTContext();
385 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
386 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual)
387 return FD->getNameAsString();
389 llvm::SmallString<256> Name;
390 llvm::raw_svector_ostream Out(Name);
392 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
393 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual)
399 PrintingPolicy Policy(Context.getLangOptions());
401 std::string Proto = FD->getQualifiedNameAsString(Policy);
403 const FunctionType *AFT = FD->getType()->getAs<FunctionType>();
404 const FunctionProtoType *FT = 0;
405 if (FD->hasWrittenPrototype())
406 FT = dyn_cast<FunctionProtoType>(AFT);
410 llvm::raw_string_ostream POut(Proto);
411 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
414 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy);
418 if (FT->isVariadic()) {
419 if (FD->getNumParams()) POut << ", ";
425 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
426 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers());
427 if (ThisQuals.hasConst())
429 if (ThisQuals.hasVolatile())
430 Proto += " volatile";
433 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD))
434 AFT->getResultType().getAsStringInternal(Proto, Policy);
439 return Name.str().str();
441 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) {
442 llvm::SmallString<256> Name;
443 llvm::raw_svector_ostream Out(Name);
444 Out << (MD->isInstanceMethod() ? '-' : '+');
447 // For incorrect code, there might not be an ObjCInterfaceDecl. Do
448 // a null check to avoid a crash.
449 if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
452 if (const ObjCCategoryImplDecl *CID =
453 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext()))
454 Out << '(' << CID << ')';
457 Out << MD->getSelector().getAsString();
461 return Name.str().str();
463 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) {
464 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
470 void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) {
474 BitWidth = Val.getBitWidth();
475 unsigned NumWords = Val.getNumWords();
476 const uint64_t* Words = Val.getRawData();
478 pVal = new (C) uint64_t[NumWords];
479 std::copy(Words, Words + NumWords, pVal);
480 } else if (NumWords == 1)
487 IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V,
488 QualType type, SourceLocation l) {
489 return new (C) IntegerLiteral(C, V, type, l);
493 IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) {
494 return new (C) IntegerLiteral(Empty);
498 FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V,
499 bool isexact, QualType Type, SourceLocation L) {
500 return new (C) FloatingLiteral(C, V, isexact, Type, L);
504 FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) {
505 return new (C) FloatingLiteral(Empty);
508 /// getValueAsApproximateDouble - This returns the value as an inaccurate
509 /// double. Note that this may cause loss of precision, but is useful for
510 /// debugging dumps, etc.
511 double FloatingLiteral::getValueAsApproximateDouble() const {
512 llvm::APFloat V = getValue();
514 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
516 return V.convertToDouble();
519 StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData,
520 unsigned ByteLength, bool Wide,
522 const SourceLocation *Loc,
524 // Allocate enough space for the StringLiteral plus an array of locations for
525 // any concatenated string tokens.
526 void *Mem = C.Allocate(sizeof(StringLiteral)+
527 sizeof(SourceLocation)*(NumStrs-1),
528 llvm::alignOf<StringLiteral>());
529 StringLiteral *SL = new (Mem) StringLiteral(Ty);
531 // OPTIMIZE: could allocate this appended to the StringLiteral.
532 char *AStrData = new (C, 1) char[ByteLength];
533 memcpy(AStrData, StrData, ByteLength);
534 SL->StrData = AStrData;
535 SL->ByteLength = ByteLength;
537 SL->TokLocs[0] = Loc[0];
538 SL->NumConcatenated = NumStrs;
541 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1));
545 StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) {
546 void *Mem = C.Allocate(sizeof(StringLiteral)+
547 sizeof(SourceLocation)*(NumStrs-1),
548 llvm::alignOf<StringLiteral>());
549 StringLiteral *SL = new (Mem) StringLiteral(QualType());
552 SL->NumConcatenated = NumStrs;
556 void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) {
557 char *AStrData = new (C, 1) char[Str.size()];
558 memcpy(AStrData, Str.data(), Str.size());
560 ByteLength = Str.size();
563 /// getLocationOfByte - Return a source location that points to the specified
564 /// byte of this string literal.
566 /// Strings are amazingly complex. They can be formed from multiple tokens and
567 /// can have escape sequences in them in addition to the usual trigraph and
568 /// escaped newline business. This routine handles this complexity.
570 SourceLocation StringLiteral::
571 getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
572 const LangOptions &Features, const TargetInfo &Target) const {
573 assert(!isWide() && "This doesn't work for wide strings yet");
575 // Loop over all of the tokens in this string until we find the one that
576 // contains the byte we're looking for.
579 assert(TokNo < getNumConcatenated() && "Invalid byte number!");
580 SourceLocation StrTokLoc = getStrTokenLoc(TokNo);
582 // Get the spelling of the string so that we can get the data that makes up
583 // the string literal, not the identifier for the macro it is potentially
585 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc);
587 // Re-lex the token to get its length and original spelling.
588 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc);
589 bool Invalid = false;
590 llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid);
592 return StrTokSpellingLoc;
594 const char *StrData = Buffer.data()+LocInfo.second;
596 // Create a langops struct and enable trigraphs. This is sufficient for
598 LangOptions LangOpts;
599 LangOpts.Trigraphs = true;
601 // Create a lexer starting at the beginning of this token.
602 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData,
605 TheLexer.LexFromRawLexer(TheTok);
607 // Use the StringLiteralParser to compute the length of the string in bytes.
608 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target);
609 unsigned TokNumBytes = SLP.GetStringLength();
611 // If the byte is in this token, return the location of the byte.
612 if (ByteNo < TokNumBytes ||
613 (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) {
614 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo);
616 // Now that we know the offset of the token in the spelling, use the
617 // preprocessor to get the offset in the original source.
618 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features);
621 // Move to the next string token.
623 ByteNo -= TokNumBytes;
629 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
630 /// corresponds to, e.g. "sizeof" or "[pre]++".
631 const char *UnaryOperator::getOpcodeStr(Opcode Op) {
633 default: assert(0 && "Unknown unary operator");
634 case UO_PostInc: return "++";
635 case UO_PostDec: return "--";
636 case UO_PreInc: return "++";
637 case UO_PreDec: return "--";
638 case UO_AddrOf: return "&";
639 case UO_Deref: return "*";
640 case UO_Plus: return "+";
641 case UO_Minus: return "-";
642 case UO_Not: return "~";
643 case UO_LNot: return "!";
644 case UO_Real: return "__real";
645 case UO_Imag: return "__imag";
646 case UO_Extension: return "__extension__";
651 UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
653 default: assert(false && "No unary operator for overloaded function");
654 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc;
655 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec;
656 case OO_Amp: return UO_AddrOf;
657 case OO_Star: return UO_Deref;
658 case OO_Plus: return UO_Plus;
659 case OO_Minus: return UO_Minus;
660 case OO_Tilde: return UO_Not;
661 case OO_Exclaim: return UO_LNot;
665 OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
667 case UO_PostInc: case UO_PreInc: return OO_PlusPlus;
668 case UO_PostDec: case UO_PreDec: return OO_MinusMinus;
669 case UO_AddrOf: return OO_Amp;
670 case UO_Deref: return OO_Star;
671 case UO_Plus: return OO_Plus;
672 case UO_Minus: return OO_Minus;
673 case UO_Not: return OO_Tilde;
674 case UO_LNot: return OO_Exclaim;
675 default: return OO_None;
680 //===----------------------------------------------------------------------===//
681 // Postfix Operators.
682 //===----------------------------------------------------------------------===//
684 CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs,
685 Expr **args, unsigned numargs, QualType t, ExprValueKind VK,
686 SourceLocation rparenloc)
687 : Expr(SC, t, VK, OK_Ordinary,
688 fn->isTypeDependent(),
689 fn->isValueDependent(),
690 fn->containsUnexpandedParameterPack()),
693 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs];
695 for (unsigned i = 0; i != numargs; ++i) {
696 if (args[i]->isTypeDependent())
697 ExprBits.TypeDependent = true;
698 if (args[i]->isValueDependent())
699 ExprBits.ValueDependent = true;
700 if (args[i]->containsUnexpandedParameterPack())
701 ExprBits.ContainsUnexpandedParameterPack = true;
703 SubExprs[i+PREARGS_START+NumPreArgs] = args[i];
706 CallExprBits.NumPreArgs = NumPreArgs;
707 RParenLoc = rparenloc;
710 CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs,
711 QualType t, ExprValueKind VK, SourceLocation rparenloc)
712 : Expr(CallExprClass, t, VK, OK_Ordinary,
713 fn->isTypeDependent(),
714 fn->isValueDependent(),
715 fn->containsUnexpandedParameterPack()),
718 SubExprs = new (C) Stmt*[numargs+PREARGS_START];
720 for (unsigned i = 0; i != numargs; ++i) {
721 if (args[i]->isTypeDependent())
722 ExprBits.TypeDependent = true;
723 if (args[i]->isValueDependent())
724 ExprBits.ValueDependent = true;
725 if (args[i]->containsUnexpandedParameterPack())
726 ExprBits.ContainsUnexpandedParameterPack = true;
728 SubExprs[i+PREARGS_START] = args[i];
731 CallExprBits.NumPreArgs = 0;
732 RParenLoc = rparenloc;
735 CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty)
736 : Expr(SC, Empty), SubExprs(0), NumArgs(0) {
737 // FIXME: Why do we allocate this?
738 SubExprs = new (C) Stmt*[PREARGS_START];
739 CallExprBits.NumPreArgs = 0;
742 CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs,
744 : Expr(SC, Empty), SubExprs(0), NumArgs(0) {
745 // FIXME: Why do we allocate this?
746 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs];
747 CallExprBits.NumPreArgs = NumPreArgs;
750 Decl *CallExpr::getCalleeDecl() {
751 Expr *CEE = getCallee()->IgnoreParenCasts();
752 // If we're calling a dereference, look at the pointer instead.
753 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) {
754 if (BO->isPtrMemOp())
755 CEE = BO->getRHS()->IgnoreParenCasts();
756 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) {
757 if (UO->getOpcode() == UO_Deref)
758 CEE = UO->getSubExpr()->IgnoreParenCasts();
760 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE))
761 return DRE->getDecl();
762 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE))
763 return ME->getMemberDecl();
768 FunctionDecl *CallExpr::getDirectCallee() {
769 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl());
772 /// setNumArgs - This changes the number of arguments present in this call.
773 /// Any orphaned expressions are deleted by this, and any new operands are set
775 void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) {
776 // No change, just return.
777 if (NumArgs == getNumArgs()) return;
779 // If shrinking # arguments, just delete the extras and forgot them.
780 if (NumArgs < getNumArgs()) {
781 this->NumArgs = NumArgs;
785 // Otherwise, we are growing the # arguments. New an bigger argument array.
786 unsigned NumPreArgs = getNumPreArgs();
787 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs];
789 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i)
790 NewSubExprs[i] = SubExprs[i];
791 // Null out new args.
792 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs;
793 i != NumArgs+PREARGS_START+NumPreArgs; ++i)
796 if (SubExprs) C.Deallocate(SubExprs);
797 SubExprs = NewSubExprs;
798 this->NumArgs = NumArgs;
801 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If
803 unsigned CallExpr::isBuiltinCall(const ASTContext &Context) const {
804 // All simple function calls (e.g. func()) are implicitly cast to pointer to
805 // function. As a result, we try and obtain the DeclRefExpr from the
807 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
808 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
811 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
815 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
819 if (!FDecl->getIdentifier())
822 return FDecl->getBuiltinID();
825 QualType CallExpr::getCallReturnType() const {
826 QualType CalleeType = getCallee()->getType();
827 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>())
828 CalleeType = FnTypePtr->getPointeeType();
829 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>())
830 CalleeType = BPT->getPointeeType();
831 else if (const MemberPointerType *MPT
832 = CalleeType->getAs<MemberPointerType>())
833 CalleeType = MPT->getPointeeType();
835 const FunctionType *FnType = CalleeType->getAs<FunctionType>();
836 return FnType->getResultType();
839 OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type,
840 SourceLocation OperatorLoc,
842 OffsetOfNode* compsPtr, unsigned numComps,
843 Expr** exprsPtr, unsigned numExprs,
844 SourceLocation RParenLoc) {
845 void *Mem = C.Allocate(sizeof(OffsetOfExpr) +
846 sizeof(OffsetOfNode) * numComps +
847 sizeof(Expr*) * numExprs);
849 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps,
850 exprsPtr, numExprs, RParenLoc);
853 OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C,
854 unsigned numComps, unsigned numExprs) {
855 void *Mem = C.Allocate(sizeof(OffsetOfExpr) +
856 sizeof(OffsetOfNode) * numComps +
857 sizeof(Expr*) * numExprs);
858 return new (Mem) OffsetOfExpr(numComps, numExprs);
861 OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type,
862 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
863 OffsetOfNode* compsPtr, unsigned numComps,
864 Expr** exprsPtr, unsigned numExprs,
865 SourceLocation RParenLoc)
866 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary,
867 /*TypeDependent=*/false,
868 /*ValueDependent=*/tsi->getType()->isDependentType(),
869 tsi->getType()->containsUnexpandedParameterPack()),
870 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi),
871 NumComps(numComps), NumExprs(numExprs)
873 for(unsigned i = 0; i < numComps; ++i) {
874 setComponent(i, compsPtr[i]);
877 for(unsigned i = 0; i < numExprs; ++i) {
878 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent())
879 ExprBits.ValueDependent = true;
880 if (exprsPtr[i]->containsUnexpandedParameterPack())
881 ExprBits.ContainsUnexpandedParameterPack = true;
883 setIndexExpr(i, exprsPtr[i]);
887 IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const {
888 assert(getKind() == Field || getKind() == Identifier);
889 if (getKind() == Field)
890 return getField()->getIdentifier();
892 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask);
895 MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow,
896 NestedNameSpecifier *qual,
897 SourceRange qualrange,
898 ValueDecl *memberdecl,
899 DeclAccessPair founddecl,
900 DeclarationNameInfo nameinfo,
901 const TemplateArgumentListInfo *targs,
905 std::size_t Size = sizeof(MemberExpr);
907 bool hasQualOrFound = (qual != 0 ||
908 founddecl.getDecl() != memberdecl ||
909 founddecl.getAccess() != memberdecl->getAccess());
911 Size += sizeof(MemberNameQualifier);
914 Size += ExplicitTemplateArgumentList::sizeFor(*targs);
916 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>());
917 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo,
920 if (hasQualOrFound) {
921 if (qual && qual->isDependent()) {
922 E->setValueDependent(true);
923 E->setTypeDependent(true);
925 E->HasQualifierOrFoundDecl = true;
927 MemberNameQualifier *NQ = E->getMemberQualifier();
929 NQ->Range = qualrange;
930 NQ->FoundDecl = founddecl;
934 E->HasExplicitTemplateArgumentList = true;
935 E->getExplicitTemplateArgs().initializeFrom(*targs);
941 const char *CastExpr::getCastKindName() const {
942 switch (getCastKind()) {
947 case CK_LValueBitCast:
948 return "LValueBitCast";
949 case CK_LValueToRValue:
950 return "LValueToRValue";
951 case CK_GetObjCProperty:
952 return "GetObjCProperty";
955 case CK_BaseToDerived:
956 return "BaseToDerived";
957 case CK_DerivedToBase:
958 return "DerivedToBase";
959 case CK_UncheckedDerivedToBase:
960 return "UncheckedDerivedToBase";
965 case CK_ArrayToPointerDecay:
966 return "ArrayToPointerDecay";
967 case CK_FunctionToPointerDecay:
968 return "FunctionToPointerDecay";
969 case CK_NullToMemberPointer:
970 return "NullToMemberPointer";
971 case CK_NullToPointer:
972 return "NullToPointer";
973 case CK_BaseToDerivedMemberPointer:
974 return "BaseToDerivedMemberPointer";
975 case CK_DerivedToBaseMemberPointer:
976 return "DerivedToBaseMemberPointer";
977 case CK_UserDefinedConversion:
978 return "UserDefinedConversion";
979 case CK_ConstructorConversion:
980 return "ConstructorConversion";
981 case CK_IntegralToPointer:
982 return "IntegralToPointer";
983 case CK_PointerToIntegral:
984 return "PointerToIntegral";
985 case CK_PointerToBoolean:
986 return "PointerToBoolean";
990 return "VectorSplat";
991 case CK_IntegralCast:
992 return "IntegralCast";
993 case CK_IntegralToBoolean:
994 return "IntegralToBoolean";
995 case CK_IntegralToFloating:
996 return "IntegralToFloating";
997 case CK_FloatingToIntegral:
998 return "FloatingToIntegral";
999 case CK_FloatingCast:
1000 return "FloatingCast";
1001 case CK_FloatingToBoolean:
1002 return "FloatingToBoolean";
1003 case CK_MemberPointerToBoolean:
1004 return "MemberPointerToBoolean";
1005 case CK_AnyPointerToObjCPointerCast:
1006 return "AnyPointerToObjCPointerCast";
1007 case CK_AnyPointerToBlockPointerCast:
1008 return "AnyPointerToBlockPointerCast";
1009 case CK_ObjCObjectLValueCast:
1010 return "ObjCObjectLValueCast";
1011 case CK_FloatingRealToComplex:
1012 return "FloatingRealToComplex";
1013 case CK_FloatingComplexToReal:
1014 return "FloatingComplexToReal";
1015 case CK_FloatingComplexToBoolean:
1016 return "FloatingComplexToBoolean";
1017 case CK_FloatingComplexCast:
1018 return "FloatingComplexCast";
1019 case CK_FloatingComplexToIntegralComplex:
1020 return "FloatingComplexToIntegralComplex";
1021 case CK_IntegralRealToComplex:
1022 return "IntegralRealToComplex";
1023 case CK_IntegralComplexToReal:
1024 return "IntegralComplexToReal";
1025 case CK_IntegralComplexToBoolean:
1026 return "IntegralComplexToBoolean";
1027 case CK_IntegralComplexCast:
1028 return "IntegralComplexCast";
1029 case CK_IntegralComplexToFloatingComplex:
1030 return "IntegralComplexToFloatingComplex";
1033 llvm_unreachable("Unhandled cast kind!");
1037 Expr *CastExpr::getSubExprAsWritten() {
1041 SubExpr = E->getSubExpr();
1043 // Skip any temporary bindings; they're implicit.
1044 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
1045 SubExpr = Binder->getSubExpr();
1047 // Conversions by constructor and conversion functions have a
1048 // subexpression describing the call; strip it off.
1049 if (E->getCastKind() == CK_ConstructorConversion)
1050 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0);
1051 else if (E->getCastKind() == CK_UserDefinedConversion)
1052 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument();
1054 // If the subexpression we're left with is an implicit cast, look
1055 // through that, too.
1056 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr)));
1061 CXXBaseSpecifier **CastExpr::path_buffer() {
1062 switch (getStmtClass()) {
1063 #define ABSTRACT_STMT(x)
1064 #define CASTEXPR(Type, Base) \
1065 case Stmt::Type##Class: \
1066 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1);
1067 #define STMT(Type, Base)
1068 #include "clang/AST/StmtNodes.inc"
1070 llvm_unreachable("non-cast expressions not possible here");
1075 void CastExpr::setCastPath(const CXXCastPath &Path) {
1076 assert(Path.size() == path_size());
1077 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*));
1080 ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T,
1081 CastKind Kind, Expr *Operand,
1082 const CXXCastPath *BasePath,
1084 unsigned PathSize = (BasePath ? BasePath->size() : 0);
1086 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
1087 ImplicitCastExpr *E =
1088 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK);
1089 if (PathSize) E->setCastPath(*BasePath);
1093 ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C,
1094 unsigned PathSize) {
1096 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
1097 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize);
1101 CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T,
1102 ExprValueKind VK, CastKind K, Expr *Op,
1103 const CXXCastPath *BasePath,
1104 TypeSourceInfo *WrittenTy,
1105 SourceLocation L, SourceLocation R) {
1106 unsigned PathSize = (BasePath ? BasePath->size() : 0);
1108 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
1110 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R);
1111 if (PathSize) E->setCastPath(*BasePath);
1115 CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) {
1117 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
1118 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize);
1121 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1122 /// corresponds to, e.g. "<<=".
1123 const char *BinaryOperator::getOpcodeStr(Opcode Op) {
1125 case BO_PtrMemD: return ".*";
1126 case BO_PtrMemI: return "->*";
1127 case BO_Mul: return "*";
1128 case BO_Div: return "/";
1129 case BO_Rem: return "%";
1130 case BO_Add: return "+";
1131 case BO_Sub: return "-";
1132 case BO_Shl: return "<<";
1133 case BO_Shr: return ">>";
1134 case BO_LT: return "<";
1135 case BO_GT: return ">";
1136 case BO_LE: return "<=";
1137 case BO_GE: return ">=";
1138 case BO_EQ: return "==";
1139 case BO_NE: return "!=";
1140 case BO_And: return "&";
1141 case BO_Xor: return "^";
1142 case BO_Or: return "|";
1143 case BO_LAnd: return "&&";
1144 case BO_LOr: return "||";
1145 case BO_Assign: return "=";
1146 case BO_MulAssign: return "*=";
1147 case BO_DivAssign: return "/=";
1148 case BO_RemAssign: return "%=";
1149 case BO_AddAssign: return "+=";
1150 case BO_SubAssign: return "-=";
1151 case BO_ShlAssign: return "<<=";
1152 case BO_ShrAssign: return ">>=";
1153 case BO_AndAssign: return "&=";
1154 case BO_XorAssign: return "^=";
1155 case BO_OrAssign: return "|=";
1156 case BO_Comma: return ",";
1163 BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
1165 default: assert(false && "Not an overloadable binary operator");
1166 case OO_Plus: return BO_Add;
1167 case OO_Minus: return BO_Sub;
1168 case OO_Star: return BO_Mul;
1169 case OO_Slash: return BO_Div;
1170 case OO_Percent: return BO_Rem;
1171 case OO_Caret: return BO_Xor;
1172 case OO_Amp: return BO_And;
1173 case OO_Pipe: return BO_Or;
1174 case OO_Equal: return BO_Assign;
1175 case OO_Less: return BO_LT;
1176 case OO_Greater: return BO_GT;
1177 case OO_PlusEqual: return BO_AddAssign;
1178 case OO_MinusEqual: return BO_SubAssign;
1179 case OO_StarEqual: return BO_MulAssign;
1180 case OO_SlashEqual: return BO_DivAssign;
1181 case OO_PercentEqual: return BO_RemAssign;
1182 case OO_CaretEqual: return BO_XorAssign;
1183 case OO_AmpEqual: return BO_AndAssign;
1184 case OO_PipeEqual: return BO_OrAssign;
1185 case OO_LessLess: return BO_Shl;
1186 case OO_GreaterGreater: return BO_Shr;
1187 case OO_LessLessEqual: return BO_ShlAssign;
1188 case OO_GreaterGreaterEqual: return BO_ShrAssign;
1189 case OO_EqualEqual: return BO_EQ;
1190 case OO_ExclaimEqual: return BO_NE;
1191 case OO_LessEqual: return BO_LE;
1192 case OO_GreaterEqual: return BO_GE;
1193 case OO_AmpAmp: return BO_LAnd;
1194 case OO_PipePipe: return BO_LOr;
1195 case OO_Comma: return BO_Comma;
1196 case OO_ArrowStar: return BO_PtrMemI;
1200 OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
1201 static const OverloadedOperatorKind OverOps[] = {
1202 /* .* Cannot be overloaded */OO_None, OO_ArrowStar,
1203 OO_Star, OO_Slash, OO_Percent,
1205 OO_LessLess, OO_GreaterGreater,
1206 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
1207 OO_EqualEqual, OO_ExclaimEqual,
1213 OO_Equal, OO_StarEqual,
1214 OO_SlashEqual, OO_PercentEqual,
1215 OO_PlusEqual, OO_MinusEqual,
1216 OO_LessLessEqual, OO_GreaterGreaterEqual,
1217 OO_AmpEqual, OO_CaretEqual,
1221 return OverOps[Opc];
1224 InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc,
1225 Expr **initExprs, unsigned numInits,
1226 SourceLocation rbraceloc)
1227 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false,
1229 InitExprs(C, numInits),
1230 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0),
1231 UnionFieldInit(0), HadArrayRangeDesignator(false)
1233 for (unsigned I = 0; I != numInits; ++I) {
1234 if (initExprs[I]->isTypeDependent())
1235 ExprBits.TypeDependent = true;
1236 if (initExprs[I]->isValueDependent())
1237 ExprBits.ValueDependent = true;
1238 if (initExprs[I]->containsUnexpandedParameterPack())
1239 ExprBits.ContainsUnexpandedParameterPack = true;
1242 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits);
1245 void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) {
1246 if (NumInits > InitExprs.size())
1247 InitExprs.reserve(C, NumInits);
1250 void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) {
1251 InitExprs.resize(C, NumInits, 0);
1254 Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) {
1255 if (Init >= InitExprs.size()) {
1256 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0);
1257 InitExprs.back() = expr;
1261 Expr *Result = cast_or_null<Expr>(InitExprs[Init]);
1262 InitExprs[Init] = expr;
1266 SourceRange InitListExpr::getSourceRange() const {
1268 return SyntacticForm->getSourceRange();
1269 SourceLocation Beg = LBraceLoc, End = RBraceLoc;
1270 if (Beg.isInvalid()) {
1271 // Find the first non-null initializer.
1272 for (InitExprsTy::const_iterator I = InitExprs.begin(),
1273 E = InitExprs.end();
1276 Beg = S->getLocStart();
1281 if (End.isInvalid()) {
1282 // Find the first non-null initializer from the end.
1283 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(),
1284 E = InitExprs.rend();
1287 End = S->getSourceRange().getEnd();
1292 return SourceRange(Beg, End);
1295 /// getFunctionType - Return the underlying function type for this block.
1297 const FunctionType *BlockExpr::getFunctionType() const {
1298 return getType()->getAs<BlockPointerType>()->
1299 getPointeeType()->getAs<FunctionType>();
1302 SourceLocation BlockExpr::getCaretLocation() const {
1303 return TheBlock->getCaretLocation();
1305 const Stmt *BlockExpr::getBody() const {
1306 return TheBlock->getBody();
1308 Stmt *BlockExpr::getBody() {
1309 return TheBlock->getBody();
1313 //===----------------------------------------------------------------------===//
1314 // Generic Expression Routines
1315 //===----------------------------------------------------------------------===//
1317 /// isUnusedResultAWarning - Return true if this immediate expression should
1318 /// be warned about if the result is unused. If so, fill in Loc and Ranges
1319 /// with location to warn on and the source range[s] to report with the
1321 bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
1322 SourceRange &R2, ASTContext &Ctx) const {
1323 // Don't warn if the expr is type dependent. The type could end up
1324 // instantiating to void.
1325 if (isTypeDependent())
1328 switch (getStmtClass()) {
1330 if (getType()->isVoidType())
1333 R1 = getSourceRange();
1335 case ParenExprClass:
1336 return cast<ParenExpr>(this)->getSubExpr()->
1337 isUnusedResultAWarning(Loc, R1, R2, Ctx);
1338 case UnaryOperatorClass: {
1339 const UnaryOperator *UO = cast<UnaryOperator>(this);
1341 switch (UO->getOpcode()) {
1346 case UO_PreDec: // ++/--
1347 return false; // Not a warning.
1349 // Dereferencing a volatile pointer is a side-effect.
1350 if (Ctx.getCanonicalType(getType()).isVolatileQualified())
1355 // accessing a piece of a volatile complex is a side-effect.
1356 if (Ctx.getCanonicalType(UO->getSubExpr()->getType())
1357 .isVolatileQualified())
1361 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1363 Loc = UO->getOperatorLoc();
1364 R1 = UO->getSubExpr()->getSourceRange();
1367 case BinaryOperatorClass: {
1368 const BinaryOperator *BO = cast<BinaryOperator>(this);
1369 switch (BO->getOpcode()) {
1372 // Consider the RHS of comma for side effects. LHS was checked by
1373 // Sema::CheckCommaOperands.
1375 // ((foo = <blah>), 0) is an idiom for hiding the result (and
1376 // lvalue-ness) of an assignment written in a macro.
1377 if (IntegerLiteral *IE =
1378 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens()))
1379 if (IE->getValue() == 0)
1381 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1382 // Consider '||', '&&' to have side effects if the LHS or RHS does.
1385 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) ||
1386 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx))
1390 if (BO->isAssignmentOp())
1392 Loc = BO->getOperatorLoc();
1393 R1 = BO->getLHS()->getSourceRange();
1394 R2 = BO->getRHS()->getSourceRange();
1397 case CompoundAssignOperatorClass:
1398 case VAArgExprClass:
1401 case ConditionalOperatorClass: {
1402 // The condition must be evaluated, but if either the LHS or RHS is a
1403 // warning, warn about them.
1404 const ConditionalOperator *Exp = cast<ConditionalOperator>(this);
1405 if (Exp->getLHS() &&
1406 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx))
1408 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1411 case MemberExprClass:
1412 // If the base pointer or element is to a volatile pointer/field, accessing
1413 // it is a side effect.
1414 if (Ctx.getCanonicalType(getType()).isVolatileQualified())
1416 Loc = cast<MemberExpr>(this)->getMemberLoc();
1417 R1 = SourceRange(Loc, Loc);
1418 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange();
1421 case ArraySubscriptExprClass:
1422 // If the base pointer or element is to a volatile pointer/field, accessing
1423 // it is a side effect.
1424 if (Ctx.getCanonicalType(getType()).isVolatileQualified())
1426 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
1427 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
1428 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
1432 case CXXOperatorCallExprClass:
1433 case CXXMemberCallExprClass: {
1434 // If this is a direct call, get the callee.
1435 const CallExpr *CE = cast<CallExpr>(this);
1436 if (const Decl *FD = CE->getCalleeDecl()) {
1437 // If the callee has attribute pure, const, or warn_unused_result, warn
1438 // about it. void foo() { strlen("bar"); } should warn.
1440 // Note: If new cases are added here, DiagnoseUnusedExprResult should be
1441 // updated to match for QoI.
1442 if (FD->getAttr<WarnUnusedResultAttr>() ||
1443 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) {
1444 Loc = CE->getCallee()->getLocStart();
1445 R1 = CE->getCallee()->getSourceRange();
1447 if (unsigned NumArgs = CE->getNumArgs())
1448 R2 = SourceRange(CE->getArg(0)->getLocStart(),
1449 CE->getArg(NumArgs-1)->getLocEnd());
1456 case CXXTemporaryObjectExprClass:
1457 case CXXConstructExprClass:
1460 case ObjCMessageExprClass: {
1461 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this);
1462 const ObjCMethodDecl *MD = ME->getMethodDecl();
1463 if (MD && MD->getAttr<WarnUnusedResultAttr>()) {
1470 case ObjCPropertyRefExprClass:
1472 R1 = getSourceRange();
1475 case StmtExprClass: {
1476 // Statement exprs don't logically have side effects themselves, but are
1477 // sometimes used in macros in ways that give them a type that is unused.
1478 // For example ({ blah; foo(); }) will end up with a type if foo has a type.
1479 // however, if the result of the stmt expr is dead, we don't want to emit a
1481 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt();
1482 if (!CS->body_empty()) {
1483 if (const Expr *E = dyn_cast<Expr>(CS->body_back()))
1484 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1485 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back()))
1486 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt()))
1487 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1490 if (getType()->isVoidType())
1492 Loc = cast<StmtExpr>(this)->getLParenLoc();
1493 R1 = getSourceRange();
1496 case CStyleCastExprClass:
1497 // If this is an explicit cast to void, allow it. People do this when they
1498 // think they know what they're doing :).
1499 if (getType()->isVoidType())
1501 Loc = cast<CStyleCastExpr>(this)->getLParenLoc();
1502 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange();
1504 case CXXFunctionalCastExprClass: {
1505 if (getType()->isVoidType())
1507 const CastExpr *CE = cast<CastExpr>(this);
1509 // If this is a cast to void or a constructor conversion, check the operand.
1510 // Otherwise, the result of the cast is unused.
1511 if (CE->getCastKind() == CK_ToVoid ||
1512 CE->getCastKind() == CK_ConstructorConversion)
1513 return (cast<CastExpr>(this)->getSubExpr()
1514 ->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1515 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc();
1516 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange();
1520 case ImplicitCastExprClass:
1521 // Check the operand, since implicit casts are inserted by Sema
1522 return (cast<ImplicitCastExpr>(this)
1523 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1525 case CXXDefaultArgExprClass:
1526 return (cast<CXXDefaultArgExpr>(this)
1527 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1529 case CXXNewExprClass:
1530 // FIXME: In theory, there might be new expressions that don't have side
1531 // effects (e.g. a placement new with an uninitialized POD).
1532 case CXXDeleteExprClass:
1534 case CXXBindTemporaryExprClass:
1535 return (cast<CXXBindTemporaryExpr>(this)
1536 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1537 case ExprWithCleanupsClass:
1538 return (cast<ExprWithCleanups>(this)
1539 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1543 /// isOBJCGCCandidate - Check if an expression is objc gc'able.
1544 /// returns true, if it is; false otherwise.
1545 bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
1546 switch (getStmtClass()) {
1549 case ObjCIvarRefExprClass:
1551 case Expr::UnaryOperatorClass:
1552 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1553 case ParenExprClass:
1554 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1555 case ImplicitCastExprClass:
1556 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1557 case CStyleCastExprClass:
1558 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1559 case DeclRefExprClass: {
1560 const Decl *D = cast<DeclRefExpr>(this)->getDecl();
1561 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1562 if (VD->hasGlobalStorage())
1564 QualType T = VD->getType();
1565 // dereferencing to a pointer is always a gc'able candidate,
1566 // unless it is __weak.
1567 return T->isPointerType() &&
1568 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak);
1572 case MemberExprClass: {
1573 const MemberExpr *M = cast<MemberExpr>(this);
1574 return M->getBase()->isOBJCGCCandidate(Ctx);
1576 case ArraySubscriptExprClass:
1577 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx);
1581 bool Expr::isBoundMemberFunction(ASTContext &Ctx) const {
1582 if (isTypeDependent())
1584 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction;
1587 static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1,
1588 Expr::CanThrowResult CT2) {
1589 // CanThrowResult constants are ordered so that the maximum is the correct
1591 return CT1 > CT2 ? CT1 : CT2;
1594 static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) {
1595 Expr *E = const_cast<Expr*>(CE);
1596 Expr::CanThrowResult R = Expr::CT_Cannot;
1597 for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) {
1598 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C));
1603 static Expr::CanThrowResult CanCalleeThrow(const Decl *D,
1604 bool NullThrows = true) {
1606 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot;
1608 // See if we can get a function type from the decl somehow.
1609 const ValueDecl *VD = dyn_cast<ValueDecl>(D);
1610 if (!VD) // If we have no clue what we're calling, assume the worst.
1611 return Expr::CT_Can;
1613 // As an extension, we assume that __attribute__((nothrow)) functions don't
1615 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>())
1616 return Expr::CT_Cannot;
1618 QualType T = VD->getType();
1619 const FunctionProtoType *FT;
1620 if ((FT = T->getAs<FunctionProtoType>())) {
1621 } else if (const PointerType *PT = T->getAs<PointerType>())
1622 FT = PT->getPointeeType()->getAs<FunctionProtoType>();
1623 else if (const ReferenceType *RT = T->getAs<ReferenceType>())
1624 FT = RT->getPointeeType()->getAs<FunctionProtoType>();
1625 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>())
1626 FT = MT->getPointeeType()->getAs<FunctionProtoType>();
1627 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>())
1628 FT = BT->getPointeeType()->getAs<FunctionProtoType>();
1631 return Expr::CT_Can;
1633 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can;
1636 static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) {
1637 if (DC->isTypeDependent())
1638 return Expr::CT_Dependent;
1640 if (!DC->getTypeAsWritten()->isReferenceType())
1641 return Expr::CT_Cannot;
1643 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot;
1646 static Expr::CanThrowResult CanTypeidThrow(ASTContext &C,
1647 const CXXTypeidExpr *DC) {
1648 if (DC->isTypeOperand())
1649 return Expr::CT_Cannot;
1651 Expr *Op = DC->getExprOperand();
1652 if (Op->isTypeDependent())
1653 return Expr::CT_Dependent;
1655 const RecordType *RT = Op->getType()->getAs<RecordType>();
1657 return Expr::CT_Cannot;
1659 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic())
1660 return Expr::CT_Cannot;
1662 if (Op->Classify(C).isPRValue())
1663 return Expr::CT_Cannot;
1665 return Expr::CT_Can;
1668 Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const {
1669 // C++ [expr.unary.noexcept]p3:
1670 // [Can throw] if in a potentially-evaluated context the expression would
1672 switch (getStmtClass()) {
1673 case CXXThrowExprClass:
1674 // - a potentially evaluated throw-expression
1677 case CXXDynamicCastExprClass: {
1678 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v),
1679 // where T is a reference type, that requires a run-time check
1680 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this));
1683 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1686 case CXXTypeidExprClass:
1687 // - a potentially evaluated typeid expression applied to a glvalue
1688 // expression whose type is a polymorphic class type
1689 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this));
1691 // - a potentially evaluated call to a function, member function, function
1692 // pointer, or member function pointer that does not have a non-throwing
1693 // exception-specification
1695 case CXXOperatorCallExprClass:
1696 case CXXMemberCallExprClass: {
1697 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl());
1700 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1703 case CXXConstructExprClass:
1704 case CXXTemporaryObjectExprClass: {
1705 CanThrowResult CT = CanCalleeThrow(
1706 cast<CXXConstructExpr>(this)->getConstructor());
1709 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1712 case CXXNewExprClass: {
1713 CanThrowResult CT = MergeCanThrow(
1714 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()),
1715 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(),
1716 /*NullThrows*/false));
1719 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1722 case CXXDeleteExprClass: {
1723 CanThrowResult CT = CanCalleeThrow(
1724 cast<CXXDeleteExpr>(this)->getOperatorDelete());
1727 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument();
1728 // Unwrap exactly one implicit cast, which converts all pointers to void*.
1729 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg))
1730 Arg = Cast->getSubExpr();
1731 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) {
1732 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) {
1733 CanThrowResult CT2 = CanCalleeThrow(
1734 cast<CXXRecordDecl>(RT->getDecl())->getDestructor());
1737 CT = MergeCanThrow(CT, CT2);
1740 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1743 case CXXBindTemporaryExprClass: {
1744 // The bound temporary has to be destroyed again, which might throw.
1745 CanThrowResult CT = CanCalleeThrow(
1746 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor());
1749 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1752 // ObjC message sends are like function calls, but never have exception
1754 case ObjCMessageExprClass:
1755 case ObjCPropertyRefExprClass:
1758 // Many other things have subexpressions, so we have to test those.
1760 case ParenExprClass:
1761 case MemberExprClass:
1762 case CXXReinterpretCastExprClass:
1763 case CXXConstCastExprClass:
1764 case ConditionalOperatorClass:
1765 case CompoundLiteralExprClass:
1766 case ExtVectorElementExprClass:
1767 case InitListExprClass:
1768 case DesignatedInitExprClass:
1769 case ParenListExprClass:
1770 case VAArgExprClass:
1771 case CXXDefaultArgExprClass:
1772 case ExprWithCleanupsClass:
1773 case ObjCIvarRefExprClass:
1774 case ObjCIsaExprClass:
1775 case ShuffleVectorExprClass:
1776 return CanSubExprsThrow(C, this);
1778 // Some might be dependent for other reasons.
1779 case UnaryOperatorClass:
1780 case ArraySubscriptExprClass:
1781 case ImplicitCastExprClass:
1782 case CStyleCastExprClass:
1783 case CXXStaticCastExprClass:
1784 case CXXFunctionalCastExprClass:
1785 case BinaryOperatorClass:
1786 case CompoundAssignOperatorClass: {
1787 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot;
1788 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1791 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms.
1795 case ChooseExprClass:
1796 if (isTypeDependent() || isValueDependent())
1797 return CT_Dependent;
1798 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C);
1800 // Some expressions are always dependent.
1801 case DependentScopeDeclRefExprClass:
1802 case CXXUnresolvedConstructExprClass:
1803 case CXXDependentScopeMemberExprClass:
1804 return CT_Dependent;
1807 // All other expressions don't have subexpressions, or else they are
1813 Expr* Expr::IgnoreParens() {
1816 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) {
1817 E = P->getSubExpr();
1820 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
1821 if (P->getOpcode() == UO_Extension) {
1822 E = P->getSubExpr();
1830 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr
1831 /// or CastExprs or ImplicitCastExprs, returning their operand.
1832 Expr *Expr::IgnoreParenCasts() {
1835 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) {
1836 E = P->getSubExpr();
1839 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
1840 E = P->getSubExpr();
1843 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
1844 if (P->getOpcode() == UO_Extension) {
1845 E = P->getSubExpr();
1853 /// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue
1854 /// casts. This is intended purely as a temporary workaround for code
1855 /// that hasn't yet been rewritten to do the right thing about those
1856 /// casts, and may disappear along with the last internal use.
1857 Expr *Expr::IgnoreParenLValueCasts() {
1860 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
1861 E = P->getSubExpr();
1863 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) {
1864 if (P->getCastKind() == CK_LValueToRValue) {
1865 E = P->getSubExpr();
1868 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
1869 if (P->getOpcode() == UO_Extension) {
1870 E = P->getSubExpr();
1879 Expr *Expr::IgnoreParenImpCasts() {
1882 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
1883 E = P->getSubExpr();
1886 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) {
1887 E = P->getSubExpr();
1890 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
1891 if (P->getOpcode() == UO_Extension) {
1892 E = P->getSubExpr();
1900 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the
1901 /// value (including ptr->int casts of the same size). Strip off any
1902 /// ParenExpr or CastExprs, returning their operand.
1903 Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) {
1906 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
1907 E = P->getSubExpr();
1911 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
1912 // We ignore integer <-> casts that are of the same width, ptr<->ptr and
1913 // ptr<->int casts of the same width. We also ignore all identity casts.
1914 Expr *SE = P->getSubExpr();
1916 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) {
1921 if ((E->getType()->isPointerType() ||
1922 E->getType()->isIntegralType(Ctx)) &&
1923 (SE->getType()->isPointerType() ||
1924 SE->getType()->isIntegralType(Ctx)) &&
1925 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) {
1931 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
1932 if (P->getOpcode() == UO_Extension) {
1933 E = P->getSubExpr();
1942 bool Expr::isDefaultArgument() const {
1943 const Expr *E = this;
1944 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
1945 E = ICE->getSubExprAsWritten();
1947 return isa<CXXDefaultArgExpr>(E);
1950 /// \brief Skip over any no-op casts and any temporary-binding
1952 static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) {
1953 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
1954 if (ICE->getCastKind() == CK_NoOp)
1955 E = ICE->getSubExpr();
1960 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E))
1961 E = BE->getSubExpr();
1963 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
1964 if (ICE->getCastKind() == CK_NoOp)
1965 E = ICE->getSubExpr();
1970 return E->IgnoreParens();
1973 /// isTemporaryObject - Determines if this expression produces a
1974 /// temporary of the given class type.
1975 bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const {
1976 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy)))
1979 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this);
1981 // Temporaries are by definition pr-values of class type.
1982 if (!E->Classify(C).isPRValue()) {
1983 // In this context, property reference is a message call and is pr-value.
1984 if (!isa<ObjCPropertyRefExpr>(E))
1988 // Black-list a few cases which yield pr-values of class type that don't
1989 // refer to temporaries of that type:
1991 // - implicit derived-to-base conversions
1992 if (isa<ImplicitCastExpr>(E)) {
1993 switch (cast<ImplicitCastExpr>(E)->getCastKind()) {
1994 case CK_DerivedToBase:
1995 case CK_UncheckedDerivedToBase:
2002 // - member expressions (all)
2003 if (isa<MemberExpr>(E))
2006 // - opaque values (all)
2007 if (isa<OpaqueValueExpr>(E))
2013 /// hasAnyTypeDependentArguments - Determines if any of the expressions
2014 /// in Exprs is type-dependent.
2015 bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) {
2016 for (unsigned I = 0; I < NumExprs; ++I)
2017 if (Exprs[I]->isTypeDependent())
2023 /// hasAnyValueDependentArguments - Determines if any of the expressions
2024 /// in Exprs is value-dependent.
2025 bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) {
2026 for (unsigned I = 0; I < NumExprs; ++I)
2027 if (Exprs[I]->isValueDependent())
2033 bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const {
2034 // This function is attempting whether an expression is an initializer
2035 // which can be evaluated at compile-time. isEvaluatable handles most
2036 // of the cases, but it can't deal with some initializer-specific
2037 // expressions, and it can't deal with aggregates; we deal with those here,
2038 // and fall back to isEvaluatable for the other cases.
2040 // If we ever capture reference-binding directly in the AST, we can
2041 // kill the second parameter.
2045 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects;
2048 switch (getStmtClass()) {
2050 case StringLiteralClass:
2051 case ObjCStringLiteralClass:
2052 case ObjCEncodeExprClass:
2054 case CXXTemporaryObjectExprClass:
2055 case CXXConstructExprClass: {
2056 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this);
2059 // 1) an application of the trivial default constructor or
2060 if (!CE->getConstructor()->isTrivial()) return false;
2061 if (!CE->getNumArgs()) return true;
2063 // 2) an elidable trivial copy construction of an operand which is
2064 // itself a constant initializer. Note that we consider the
2065 // operand on its own, *not* as a reference binding.
2066 return CE->isElidable() &&
2067 CE->getArg(0)->isConstantInitializer(Ctx, false);
2069 case CompoundLiteralExprClass: {
2070 // This handles gcc's extension that allows global initializers like
2071 // "struct x {int x;} x = (struct x) {};".
2072 // FIXME: This accepts other cases it shouldn't!
2073 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer();
2074 return Exp->isConstantInitializer(Ctx, false);
2076 case InitListExprClass: {
2077 // FIXME: This doesn't deal with fields with reference types correctly.
2078 // FIXME: This incorrectly allows pointers cast to integers to be assigned
2080 const InitListExpr *Exp = cast<InitListExpr>(this);
2081 unsigned numInits = Exp->getNumInits();
2082 for (unsigned i = 0; i < numInits; i++) {
2083 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false))
2088 case ImplicitValueInitExprClass:
2090 case ParenExprClass:
2091 return cast<ParenExpr>(this)->getSubExpr()
2092 ->isConstantInitializer(Ctx, IsForRef);
2093 case ChooseExprClass:
2094 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)
2095 ->isConstantInitializer(Ctx, IsForRef);
2096 case UnaryOperatorClass: {
2097 const UnaryOperator* Exp = cast<UnaryOperator>(this);
2098 if (Exp->getOpcode() == UO_Extension)
2099 return Exp->getSubExpr()->isConstantInitializer(Ctx, false);
2102 case BinaryOperatorClass: {
2103 // Special case &&foo - &&bar. It would be nice to generalize this somehow
2104 // but this handles the common case.
2105 const BinaryOperator *Exp = cast<BinaryOperator>(this);
2106 if (Exp->getOpcode() == BO_Sub &&
2107 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) &&
2108 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx)))
2112 case CXXFunctionalCastExprClass:
2113 case CXXStaticCastExprClass:
2114 case ImplicitCastExprClass:
2115 case CStyleCastExprClass:
2116 // Handle casts with a destination that's a struct or union; this
2117 // deals with both the gcc no-op struct cast extension and the
2118 // cast-to-union extension.
2119 if (getType()->isRecordType())
2120 return cast<CastExpr>(this)->getSubExpr()
2121 ->isConstantInitializer(Ctx, false);
2123 // Integer->integer casts can be handled here, which is important for
2124 // things like (int)(&&x-&&y). Scary but true.
2125 if (getType()->isIntegerType() &&
2126 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType())
2127 return cast<CastExpr>(this)->getSubExpr()
2128 ->isConstantInitializer(Ctx, false);
2132 return isEvaluatable(Ctx);
2135 /// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null
2136 /// pointer constant or not, as well as the specific kind of constant detected.
2137 /// Null pointer constants can be integer constant expressions with the
2138 /// value zero, casts of zero to void*, nullptr (C++0X), or __null
2139 /// (a GNU extension).
2140 Expr::NullPointerConstantKind
2141 Expr::isNullPointerConstant(ASTContext &Ctx,
2142 NullPointerConstantValueDependence NPC) const {
2143 if (isValueDependent()) {
2145 case NPC_NeverValueDependent:
2146 assert(false && "Unexpected value dependent expression!");
2147 // If the unthinkable happens, fall through to the safest alternative.
2149 case NPC_ValueDependentIsNull:
2150 if (isTypeDependent() || getType()->isIntegralType(Ctx))
2151 return NPCK_ZeroInteger;
2153 return NPCK_NotNull;
2155 case NPC_ValueDependentIsNotNull:
2156 return NPCK_NotNull;
2160 // Strip off a cast to void*, if it exists. Except in C++.
2161 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) {
2162 if (!Ctx.getLangOptions().CPlusPlus) {
2163 // Check that it is a cast to void*.
2164 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
2165 QualType Pointee = PT->getPointeeType();
2166 if (!Pointee.hasQualifiers() &&
2167 Pointee->isVoidType() && // to void*
2168 CE->getSubExpr()->getType()->isIntegerType()) // from int.
2169 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
2172 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) {
2173 // Ignore the ImplicitCastExpr type entirely.
2174 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
2175 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) {
2176 // Accept ((void*)0) as a null pointer constant, as many other
2177 // implementations do.
2178 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
2179 } else if (const CXXDefaultArgExpr *DefaultArg
2180 = dyn_cast<CXXDefaultArgExpr>(this)) {
2181 // See through default argument expressions
2182 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
2183 } else if (isa<GNUNullExpr>(this)) {
2184 // The GNU __null extension is always a null pointer constant.
2185 return NPCK_GNUNull;
2188 // C++0x nullptr_t is always a null pointer constant.
2189 if (getType()->isNullPtrType())
2190 return NPCK_CXX0X_nullptr;
2192 if (const RecordType *UT = getType()->getAsUnionType())
2193 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>())
2194 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){
2195 const Expr *InitExpr = CLE->getInitializer();
2196 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr))
2197 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC);
2199 // This expression must be an integer type.
2200 if (!getType()->isIntegerType() ||
2201 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType()))
2202 return NPCK_NotNull;
2204 // If we have an integer constant expression, we need to *evaluate* it and
2205 // test for the value 0.
2206 llvm::APSInt Result;
2207 bool IsNull = isIntegerConstantExpr(Result, Ctx) && Result == 0;
2209 return (IsNull ? NPCK_ZeroInteger : NPCK_NotNull);
2212 /// \brief If this expression is an l-value for an Objective C
2213 /// property, find the underlying property reference expression.
2214 const ObjCPropertyRefExpr *Expr::getObjCProperty() const {
2215 const Expr *E = this;
2217 assert((E->getValueKind() == VK_LValue &&
2218 E->getObjectKind() == OK_ObjCProperty) &&
2219 "expression is not a property reference");
2220 E = E->IgnoreParenCasts();
2221 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
2222 if (BO->getOpcode() == BO_Comma) {
2231 return cast<ObjCPropertyRefExpr>(E);
2234 FieldDecl *Expr::getBitField() {
2235 Expr *E = this->IgnoreParens();
2237 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2238 if (ICE->getCastKind() == CK_LValueToRValue ||
2239 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp))
2240 E = ICE->getSubExpr()->IgnoreParens();
2245 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E))
2246 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl()))
2247 if (Field->isBitField())
2250 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E))
2251 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl()))
2252 if (Field->isBitField())
2255 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E))
2256 if (BinOp->isAssignmentOp() && BinOp->getLHS())
2257 return BinOp->getLHS()->getBitField();
2262 bool Expr::refersToVectorElement() const {
2263 const Expr *E = this->IgnoreParens();
2265 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2266 if (ICE->getValueKind() != VK_RValue &&
2267 ICE->getCastKind() == CK_NoOp)
2268 E = ICE->getSubExpr()->IgnoreParens();
2273 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E))
2274 return ASE->getBase()->getType()->isVectorType();
2276 if (isa<ExtVectorElementExpr>(E))
2282 /// isArrow - Return true if the base expression is a pointer to vector,
2283 /// return false if the base expression is a vector.
2284 bool ExtVectorElementExpr::isArrow() const {
2285 return getBase()->getType()->isPointerType();
2288 unsigned ExtVectorElementExpr::getNumElements() const {
2289 if (const VectorType *VT = getType()->getAs<VectorType>())
2290 return VT->getNumElements();
2294 /// containsDuplicateElements - Return true if any element access is repeated.
2295 bool ExtVectorElementExpr::containsDuplicateElements() const {
2296 // FIXME: Refactor this code to an accessor on the AST node which returns the
2297 // "type" of component access, and share with code below and in Sema.
2298 llvm::StringRef Comp = Accessor->getName();
2300 // Halving swizzles do not contain duplicate elements.
2301 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
2304 // Advance past s-char prefix on hex swizzles.
2305 if (Comp[0] == 's' || Comp[0] == 'S')
2306 Comp = Comp.substr(1);
2308 for (unsigned i = 0, e = Comp.size(); i != e; ++i)
2309 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos)
2315 /// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
2316 void ExtVectorElementExpr::getEncodedElementAccess(
2317 llvm::SmallVectorImpl<unsigned> &Elts) const {
2318 llvm::StringRef Comp = Accessor->getName();
2319 if (Comp[0] == 's' || Comp[0] == 'S')
2320 Comp = Comp.substr(1);
2322 bool isHi = Comp == "hi";
2323 bool isLo = Comp == "lo";
2324 bool isEven = Comp == "even";
2325 bool isOdd = Comp == "odd";
2327 for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
2339 Index = ExtVectorType::getAccessorIdx(Comp[i]);
2341 Elts.push_back(Index);
2345 ObjCMessageExpr::ObjCMessageExpr(QualType T,
2347 SourceLocation LBracLoc,
2348 SourceLocation SuperLoc,
2349 bool IsInstanceSuper,
2352 SourceLocation SelLoc,
2353 ObjCMethodDecl *Method,
2354 Expr **Args, unsigned NumArgs,
2355 SourceLocation RBracLoc)
2356 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary,
2357 /*TypeDependent=*/false, /*ValueDependent=*/false,
2358 /*ContainsUnexpandedParameterPack=*/false),
2359 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass),
2360 HasMethod(Method != 0), SuperLoc(SuperLoc),
2361 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method
2362 : Sel.getAsOpaquePtr())),
2363 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc)
2365 setReceiverPointer(SuperType.getAsOpaquePtr());
2367 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *));
2370 ObjCMessageExpr::ObjCMessageExpr(QualType T,
2372 SourceLocation LBracLoc,
2373 TypeSourceInfo *Receiver,
2375 SourceLocation SelLoc,
2376 ObjCMethodDecl *Method,
2377 Expr **Args, unsigned NumArgs,
2378 SourceLocation RBracLoc)
2379 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(),
2380 T->isDependentType(), T->containsUnexpandedParameterPack()),
2381 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0),
2382 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method
2383 : Sel.getAsOpaquePtr())),
2384 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc)
2386 setReceiverPointer(Receiver);
2387 Expr **MyArgs = getArgs();
2388 for (unsigned I = 0; I != NumArgs; ++I) {
2389 if (Args[I]->isTypeDependent())
2390 ExprBits.TypeDependent = true;
2391 if (Args[I]->isValueDependent())
2392 ExprBits.ValueDependent = true;
2393 if (Args[I]->containsUnexpandedParameterPack())
2394 ExprBits.ContainsUnexpandedParameterPack = true;
2396 MyArgs[I] = Args[I];
2400 ObjCMessageExpr::ObjCMessageExpr(QualType T,
2402 SourceLocation LBracLoc,
2405 SourceLocation SelLoc,
2406 ObjCMethodDecl *Method,
2407 Expr **Args, unsigned NumArgs,
2408 SourceLocation RBracLoc)
2409 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(),
2410 Receiver->isTypeDependent(),
2411 Receiver->containsUnexpandedParameterPack()),
2412 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0),
2413 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method
2414 : Sel.getAsOpaquePtr())),
2415 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc)
2417 setReceiverPointer(Receiver);
2418 Expr **MyArgs = getArgs();
2419 for (unsigned I = 0; I != NumArgs; ++I) {
2420 if (Args[I]->isTypeDependent())
2421 ExprBits.TypeDependent = true;
2422 if (Args[I]->isValueDependent())
2423 ExprBits.ValueDependent = true;
2424 if (Args[I]->containsUnexpandedParameterPack())
2425 ExprBits.ContainsUnexpandedParameterPack = true;
2427 MyArgs[I] = Args[I];
2431 ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T,
2433 SourceLocation LBracLoc,
2434 SourceLocation SuperLoc,
2435 bool IsInstanceSuper,
2438 SourceLocation SelLoc,
2439 ObjCMethodDecl *Method,
2440 Expr **Args, unsigned NumArgs,
2441 SourceLocation RBracLoc) {
2442 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) +
2443 NumArgs * sizeof(Expr *);
2444 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment);
2445 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper,
2446 SuperType, Sel, SelLoc, Method, Args,NumArgs,
2450 ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T,
2452 SourceLocation LBracLoc,
2453 TypeSourceInfo *Receiver,
2455 SourceLocation SelLoc,
2456 ObjCMethodDecl *Method,
2457 Expr **Args, unsigned NumArgs,
2458 SourceLocation RBracLoc) {
2459 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) +
2460 NumArgs * sizeof(Expr *);
2461 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment);
2462 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc,
2463 Method, Args, NumArgs, RBracLoc);
2466 ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T,
2468 SourceLocation LBracLoc,
2471 SourceLocation SelLoc,
2472 ObjCMethodDecl *Method,
2473 Expr **Args, unsigned NumArgs,
2474 SourceLocation RBracLoc) {
2475 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) +
2476 NumArgs * sizeof(Expr *);
2477 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment);
2478 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc,
2479 Method, Args, NumArgs, RBracLoc);
2482 ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context,
2484 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) +
2485 NumArgs * sizeof(Expr *);
2486 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment);
2487 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs);
2490 SourceRange ObjCMessageExpr::getReceiverRange() const {
2491 switch (getReceiverKind()) {
2493 return getInstanceReceiver()->getSourceRange();
2496 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange();
2500 return getSuperLoc();
2503 return SourceLocation();
2506 Selector ObjCMessageExpr::getSelector() const {
2508 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod)
2510 return Selector(SelectorOrMethod);
2513 ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const {
2514 switch (getReceiverKind()) {
2516 if (const ObjCObjectPointerType *Ptr
2517 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>())
2518 return Ptr->getInterfaceDecl();
2522 if (const ObjCObjectType *Ty
2523 = getClassReceiver()->getAs<ObjCObjectType>())
2524 return Ty->getInterface();
2528 if (const ObjCObjectPointerType *Ptr
2529 = getSuperType()->getAs<ObjCObjectPointerType>())
2530 return Ptr->getInterfaceDecl();
2534 if (const ObjCObjectType *Iface
2535 = getSuperType()->getAs<ObjCObjectType>())
2536 return Iface->getInterface();
2543 bool ChooseExpr::isConditionTrue(const ASTContext &C) const {
2544 return getCond()->EvaluateAsInt(C) != 0;
2547 ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr,
2548 QualType Type, SourceLocation BLoc,
2550 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary,
2551 Type->isDependentType(), Type->isDependentType(),
2552 Type->containsUnexpandedParameterPack()),
2553 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr)
2555 SubExprs = new (C) Stmt*[nexpr];
2556 for (unsigned i = 0; i < nexpr; i++) {
2557 if (args[i]->isTypeDependent())
2558 ExprBits.TypeDependent = true;
2559 if (args[i]->isValueDependent())
2560 ExprBits.ValueDependent = true;
2561 if (args[i]->containsUnexpandedParameterPack())
2562 ExprBits.ContainsUnexpandedParameterPack = true;
2564 SubExprs[i] = args[i];
2568 void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs,
2569 unsigned NumExprs) {
2570 if (SubExprs) C.Deallocate(SubExprs);
2572 SubExprs = new (C) Stmt* [NumExprs];
2573 this->NumExprs = NumExprs;
2574 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs);
2577 //===----------------------------------------------------------------------===//
2578 // DesignatedInitExpr
2579 //===----------------------------------------------------------------------===//
2581 IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() {
2582 assert(Kind == FieldDesignator && "Only valid on a field designator");
2583 if (Field.NameOrField & 0x01)
2584 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01);
2586 return getField()->getIdentifier();
2589 DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty,
2590 unsigned NumDesignators,
2591 const Designator *Designators,
2592 SourceLocation EqualOrColonLoc,
2595 unsigned NumIndexExprs,
2597 : Expr(DesignatedInitExprClass, Ty,
2598 Init->getValueKind(), Init->getObjectKind(),
2599 Init->isTypeDependent(), Init->isValueDependent(),
2600 Init->containsUnexpandedParameterPack()),
2601 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
2602 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) {
2603 this->Designators = new (C) Designator[NumDesignators];
2605 // Record the initializer itself.
2606 child_range Child = children();
2609 // Copy the designators and their subexpressions, computing
2610 // value-dependence along the way.
2611 unsigned IndexIdx = 0;
2612 for (unsigned I = 0; I != NumDesignators; ++I) {
2613 this->Designators[I] = Designators[I];
2615 if (this->Designators[I].isArrayDesignator()) {
2616 // Compute type- and value-dependence.
2617 Expr *Index = IndexExprs[IndexIdx];
2618 if (Index->isTypeDependent() || Index->isValueDependent())
2619 ExprBits.ValueDependent = true;
2621 // Propagate unexpanded parameter packs.
2622 if (Index->containsUnexpandedParameterPack())
2623 ExprBits.ContainsUnexpandedParameterPack = true;
2625 // Copy the index expressions into permanent storage.
2626 *Child++ = IndexExprs[IndexIdx++];
2627 } else if (this->Designators[I].isArrayRangeDesignator()) {
2628 // Compute type- and value-dependence.
2629 Expr *Start = IndexExprs[IndexIdx];
2630 Expr *End = IndexExprs[IndexIdx + 1];
2631 if (Start->isTypeDependent() || Start->isValueDependent() ||
2632 End->isTypeDependent() || End->isValueDependent())
2633 ExprBits.ValueDependent = true;
2635 // Propagate unexpanded parameter packs.
2636 if (Start->containsUnexpandedParameterPack() ||
2637 End->containsUnexpandedParameterPack())
2638 ExprBits.ContainsUnexpandedParameterPack = true;
2640 // Copy the start/end expressions into permanent storage.
2641 *Child++ = IndexExprs[IndexIdx++];
2642 *Child++ = IndexExprs[IndexIdx++];
2646 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions");
2649 DesignatedInitExpr *
2650 DesignatedInitExpr::Create(ASTContext &C, Designator *Designators,
2651 unsigned NumDesignators,
2652 Expr **IndexExprs, unsigned NumIndexExprs,
2653 SourceLocation ColonOrEqualLoc,
2654 bool UsesColonSyntax, Expr *Init) {
2655 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
2656 sizeof(Stmt *) * (NumIndexExprs + 1), 8);
2657 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators,
2658 ColonOrEqualLoc, UsesColonSyntax,
2659 IndexExprs, NumIndexExprs, Init);
2662 DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C,
2663 unsigned NumIndexExprs) {
2664 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
2665 sizeof(Stmt *) * (NumIndexExprs + 1), 8);
2666 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
2669 void DesignatedInitExpr::setDesignators(ASTContext &C,
2670 const Designator *Desigs,
2671 unsigned NumDesigs) {
2672 Designators = new (C) Designator[NumDesigs];
2673 NumDesignators = NumDesigs;
2674 for (unsigned I = 0; I != NumDesigs; ++I)
2675 Designators[I] = Desigs[I];
2678 SourceRange DesignatedInitExpr::getSourceRange() const {
2679 SourceLocation StartLoc;
2681 *const_cast<DesignatedInitExpr*>(this)->designators_begin();
2682 if (First.isFieldDesignator()) {
2684 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc);
2686 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc);
2689 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc);
2690 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd());
2693 Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) {
2694 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator");
2695 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2696 Ptr += sizeof(DesignatedInitExpr);
2697 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2698 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
2701 Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) {
2702 assert(D.Kind == Designator::ArrayRangeDesignator &&
2703 "Requires array range designator");
2704 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2705 Ptr += sizeof(DesignatedInitExpr);
2706 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2707 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
2710 Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) {
2711 assert(D.Kind == Designator::ArrayRangeDesignator &&
2712 "Requires array range designator");
2713 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2714 Ptr += sizeof(DesignatedInitExpr);
2715 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2716 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2));
2719 /// \brief Replaces the designator at index @p Idx with the series
2720 /// of designators in [First, Last).
2721 void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx,
2722 const Designator *First,
2723 const Designator *Last) {
2724 unsigned NumNewDesignators = Last - First;
2725 if (NumNewDesignators == 0) {
2726 std::copy_backward(Designators + Idx + 1,
2727 Designators + NumDesignators,
2729 --NumNewDesignators;
2731 } else if (NumNewDesignators == 1) {
2732 Designators[Idx] = *First;
2736 Designator *NewDesignators
2737 = new (C) Designator[NumDesignators - 1 + NumNewDesignators];
2738 std::copy(Designators, Designators + Idx, NewDesignators);
2739 std::copy(First, Last, NewDesignators + Idx);
2740 std::copy(Designators + Idx + 1, Designators + NumDesignators,
2741 NewDesignators + Idx + NumNewDesignators);
2742 Designators = NewDesignators;
2743 NumDesignators = NumDesignators - 1 + NumNewDesignators;
2746 ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc,
2747 Expr **exprs, unsigned nexprs,
2748 SourceLocation rparenloc)
2749 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary,
2750 false, false, false),
2751 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) {
2753 Exprs = new (C) Stmt*[nexprs];
2754 for (unsigned i = 0; i != nexprs; ++i) {
2755 if (exprs[i]->isTypeDependent())
2756 ExprBits.TypeDependent = true;
2757 if (exprs[i]->isValueDependent())
2758 ExprBits.ValueDependent = true;
2759 if (exprs[i]->containsUnexpandedParameterPack())
2760 ExprBits.ContainsUnexpandedParameterPack = true;
2762 Exprs[i] = exprs[i];
2766 const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) {
2767 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e))
2768 e = ewc->getSubExpr();
2769 e = cast<CXXConstructExpr>(e)->getArg(0);
2770 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
2771 e = ice->getSubExpr();
2772 return cast<OpaqueValueExpr>(e);
2775 //===----------------------------------------------------------------------===//
2777 //===----------------------------------------------------------------------===//
2779 Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); }
2780 Expr* ExprIterator::operator*() const { return cast<Expr>(*I); }
2781 Expr* ExprIterator::operator->() const { return cast<Expr>(*I); }
2782 const Expr* ConstExprIterator::operator[](size_t idx) const {
2783 return cast<Expr>(I[idx]);
2785 const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); }
2786 const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); }
2788 //===----------------------------------------------------------------------===//
2789 // Child Iterators for iterating over subexpressions/substatements
2790 //===----------------------------------------------------------------------===//
2792 // SizeOfAlignOfExpr
2793 Stmt::child_range SizeOfAlignOfExpr::children() {
2794 // If this is of a type and the type is a VLA type (and not a typedef), the
2795 // size expression of the VLA needs to be treated as an executable expression.
2796 // Why isn't this weirdness documented better in StmtIterator?
2797 if (isArgumentType()) {
2798 if (const VariableArrayType* T = dyn_cast<VariableArrayType>(
2799 getArgumentType().getTypePtr()))
2800 return child_range(child_iterator(T), child_iterator());
2801 return child_range();
2803 return child_range(&Argument.Ex, &Argument.Ex + 1);
2807 Stmt::child_range ObjCMessageExpr::children() {
2809 if (getReceiverKind() == Instance)
2810 begin = reinterpret_cast<Stmt **>(this + 1);
2812 begin = reinterpret_cast<Stmt **>(getArgs());
2813 return child_range(begin,
2814 reinterpret_cast<Stmt **>(getArgs() + getNumArgs()));
2818 BlockDeclRefExpr::BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK,
2819 SourceLocation l, bool ByRef,
2821 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, false, false,
2822 d->isParameterPack()),
2823 D(d), Loc(l), IsByRef(ByRef), ConstQualAdded(constAdded)
2825 bool TypeDependent = false;
2826 bool ValueDependent = false;
2827 computeDeclRefDependence(D, getType(), TypeDependent, ValueDependent);
2828 ExprBits.TypeDependent = TypeDependent;
2829 ExprBits.ValueDependent = ValueDependent;