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 const Expr *E = IgnoreParens();
40 // If this value has _Bool type, it is obvious 0/1.
41 if (E->getType()->isBooleanType()) return true;
42 // If this is a non-scalar-integer type, we don't care enough to try.
43 if (!E->getType()->isIntegralOrEnumerationType()) return false;
45 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
46 switch (UO->getOpcode()) {
48 return UO->getSubExpr()->isKnownToHaveBooleanValue();
54 // Only look through implicit casts. If the user writes
55 // '(int) (a && b)' treat it as an arbitrary int.
56 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E))
57 return CE->getSubExpr()->isKnownToHaveBooleanValue();
59 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
60 switch (BO->getOpcode()) {
61 default: return false;
62 case BO_LT: // Relational operators.
66 case BO_EQ: // Equality operators.
68 case BO_LAnd: // AND operator.
69 case BO_LOr: // Logical OR operator.
72 case BO_And: // Bitwise AND operator.
73 case BO_Xor: // Bitwise XOR operator.
74 case BO_Or: // Bitwise OR operator.
75 // Handle things like (x==2)|(y==12).
76 return BO->getLHS()->isKnownToHaveBooleanValue() &&
77 BO->getRHS()->isKnownToHaveBooleanValue();
81 return BO->getRHS()->isKnownToHaveBooleanValue();
85 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E))
86 return CO->getTrueExpr()->isKnownToHaveBooleanValue() &&
87 CO->getFalseExpr()->isKnownToHaveBooleanValue();
92 // Amusing macro metaprogramming hack: check whether a class provides
93 // a more specific implementation of getExprLoc().
95 /// This implementation is used when a class provides a custom
96 /// implementation of getExprLoc.
97 template <class E, class T>
98 SourceLocation getExprLocImpl(const Expr *expr,
99 SourceLocation (T::*v)() const) {
100 return static_cast<const E*>(expr)->getExprLoc();
103 /// This implementation is used when a class doesn't provide
104 /// a custom implementation of getExprLoc. Overload resolution
105 /// should pick it over the implementation above because it's
106 /// more specialized according to function template partial ordering.
108 SourceLocation getExprLocImpl(const Expr *expr,
109 SourceLocation (Expr::*v)() const) {
110 return static_cast<const E*>(expr)->getSourceRange().getBegin();
114 SourceLocation Expr::getExprLoc() const {
115 switch (getStmtClass()) {
116 case Stmt::NoStmtClass: llvm_unreachable("statement without class");
117 #define ABSTRACT_STMT(type)
118 #define STMT(type, base) \
119 case Stmt::type##Class: llvm_unreachable(#type " is not an Expr"); break;
120 #define EXPR(type, base) \
121 case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc);
122 #include "clang/AST/StmtNodes.inc"
124 llvm_unreachable("unknown statement kind");
125 return SourceLocation();
128 //===----------------------------------------------------------------------===//
129 // Primary Expressions.
130 //===----------------------------------------------------------------------===//
132 void ExplicitTemplateArgumentList::initializeFrom(
133 const TemplateArgumentListInfo &Info) {
134 LAngleLoc = Info.getLAngleLoc();
135 RAngleLoc = Info.getRAngleLoc();
136 NumTemplateArgs = Info.size();
138 TemplateArgumentLoc *ArgBuffer = getTemplateArgs();
139 for (unsigned i = 0; i != NumTemplateArgs; ++i)
140 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
143 void ExplicitTemplateArgumentList::initializeFrom(
144 const TemplateArgumentListInfo &Info,
146 bool &ContainsUnexpandedParameterPack) {
147 LAngleLoc = Info.getLAngleLoc();
148 RAngleLoc = Info.getRAngleLoc();
149 NumTemplateArgs = Info.size();
151 TemplateArgumentLoc *ArgBuffer = getTemplateArgs();
152 for (unsigned i = 0; i != NumTemplateArgs; ++i) {
153 Dependent = Dependent || Info[i].getArgument().isDependent();
154 ContainsUnexpandedParameterPack
155 = ContainsUnexpandedParameterPack ||
156 Info[i].getArgument().containsUnexpandedParameterPack();
158 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]);
162 void ExplicitTemplateArgumentList::copyInto(
163 TemplateArgumentListInfo &Info) const {
164 Info.setLAngleLoc(LAngleLoc);
165 Info.setRAngleLoc(RAngleLoc);
166 for (unsigned I = 0; I != NumTemplateArgs; ++I)
167 Info.addArgument(getTemplateArgs()[I]);
170 std::size_t ExplicitTemplateArgumentList::sizeFor(unsigned NumTemplateArgs) {
171 return sizeof(ExplicitTemplateArgumentList) +
172 sizeof(TemplateArgumentLoc) * NumTemplateArgs;
175 std::size_t ExplicitTemplateArgumentList::sizeFor(
176 const TemplateArgumentListInfo &Info) {
177 return sizeFor(Info.size());
180 /// \brief Compute the type- and value-dependence of a declaration reference
181 /// based on the declaration being referenced.
182 static void computeDeclRefDependence(NamedDecl *D, QualType T,
184 bool &ValueDependent) {
185 TypeDependent = false;
186 ValueDependent = false;
189 // (TD) C++ [temp.dep.expr]p3:
190 // An id-expression is type-dependent if it contains:
194 // (VD) C++ [temp.dep.constexpr]p2:
195 // An identifier is value-dependent if it is:
197 // (TD) - an identifier that was declared with dependent type
198 // (VD) - a name declared with a dependent type,
199 if (T->isDependentType()) {
200 TypeDependent = true;
201 ValueDependent = true;
205 // (TD) - a conversion-function-id that specifies a dependent type
206 if (D->getDeclName().getNameKind()
207 == DeclarationName::CXXConversionFunctionName &&
208 D->getDeclName().getCXXNameType()->isDependentType()) {
209 TypeDependent = true;
210 ValueDependent = true;
213 // (VD) - the name of a non-type template parameter,
214 if (isa<NonTypeTemplateParmDecl>(D)) {
215 ValueDependent = true;
219 // (VD) - a constant with integral or enumeration type and is
220 // initialized with an expression that is value-dependent.
221 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
222 if (Var->getType()->isIntegralOrEnumerationType() &&
223 Var->getType().getCVRQualifiers() == Qualifiers::Const) {
224 if (const Expr *Init = Var->getAnyInitializer())
225 if (Init->isValueDependent())
226 ValueDependent = true;
229 // (VD) - FIXME: Missing from the standard:
230 // - a member function or a static data member of the current
232 else if (Var->isStaticDataMember() &&
233 Var->getDeclContext()->isDependentContext())
234 ValueDependent = true;
239 // (VD) - FIXME: Missing from the standard:
240 // - a member function or a static data member of the current
242 if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) {
243 ValueDependent = true;
248 void DeclRefExpr::computeDependence() {
249 bool TypeDependent = false;
250 bool ValueDependent = false;
251 computeDeclRefDependence(getDecl(), getType(), TypeDependent, ValueDependent);
253 // (TD) C++ [temp.dep.expr]p3:
254 // An id-expression is type-dependent if it contains:
258 // (VD) C++ [temp.dep.constexpr]p2:
259 // An identifier is value-dependent if it is:
260 if (!TypeDependent && !ValueDependent &&
261 hasExplicitTemplateArgs() &&
262 TemplateSpecializationType::anyDependentTemplateArguments(
264 getNumTemplateArgs())) {
265 TypeDependent = true;
266 ValueDependent = true;
269 ExprBits.TypeDependent = TypeDependent;
270 ExprBits.ValueDependent = ValueDependent;
272 // Is the declaration a parameter pack?
273 if (getDecl()->isParameterPack())
274 ExprBits.ContainsUnexpandedParameterPack = true;
277 DeclRefExpr::DeclRefExpr(NestedNameSpecifierLoc QualifierLoc,
278 ValueDecl *D, const DeclarationNameInfo &NameInfo,
280 const TemplateArgumentListInfo *TemplateArgs,
281 QualType T, ExprValueKind VK)
282 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false),
283 D(D), Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) {
284 DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0;
286 getInternalQualifierLoc() = QualifierLoc;
287 DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0;
289 getInternalFoundDecl() = FoundD;
290 DeclRefExprBits.HasExplicitTemplateArgs = TemplateArgs ? 1 : 0;
292 getExplicitTemplateArgs().initializeFrom(*TemplateArgs);
297 DeclRefExpr *DeclRefExpr::Create(ASTContext &Context,
298 NestedNameSpecifierLoc QualifierLoc,
300 SourceLocation NameLoc,
304 const TemplateArgumentListInfo *TemplateArgs) {
305 return Create(Context, QualifierLoc, D,
306 DeclarationNameInfo(D->getDeclName(), NameLoc),
307 T, VK, FoundD, TemplateArgs);
310 DeclRefExpr *DeclRefExpr::Create(ASTContext &Context,
311 NestedNameSpecifierLoc QualifierLoc,
313 const DeclarationNameInfo &NameInfo,
317 const TemplateArgumentListInfo *TemplateArgs) {
318 // Filter out cases where the found Decl is the same as the value refenenced.
322 std::size_t Size = sizeof(DeclRefExpr);
323 if (QualifierLoc != 0)
324 Size += sizeof(NestedNameSpecifierLoc);
326 Size += sizeof(NamedDecl *);
328 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs);
330 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>());
331 return new (Mem) DeclRefExpr(QualifierLoc, D, NameInfo, FoundD, TemplateArgs,
335 DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context,
338 bool HasExplicitTemplateArgs,
339 unsigned NumTemplateArgs) {
340 std::size_t Size = sizeof(DeclRefExpr);
342 Size += sizeof(NestedNameSpecifierLoc);
344 Size += sizeof(NamedDecl *);
345 if (HasExplicitTemplateArgs)
346 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs);
348 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>());
349 return new (Mem) DeclRefExpr(EmptyShell());
352 SourceRange DeclRefExpr::getSourceRange() const {
353 SourceRange R = getNameInfo().getSourceRange();
355 R.setBegin(getQualifierLoc().getBeginLoc());
356 if (hasExplicitTemplateArgs())
357 R.setEnd(getRAngleLoc());
361 // FIXME: Maybe this should use DeclPrinter with a special "print predefined
362 // expr" policy instead.
363 std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) {
364 ASTContext &Context = CurrentDecl->getASTContext();
366 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
367 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual)
368 return FD->getNameAsString();
370 llvm::SmallString<256> Name;
371 llvm::raw_svector_ostream Out(Name);
373 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
374 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual)
380 PrintingPolicy Policy(Context.getLangOptions());
382 std::string Proto = FD->getQualifiedNameAsString(Policy);
384 const FunctionType *AFT = FD->getType()->getAs<FunctionType>();
385 const FunctionProtoType *FT = 0;
386 if (FD->hasWrittenPrototype())
387 FT = dyn_cast<FunctionProtoType>(AFT);
391 llvm::raw_string_ostream POut(Proto);
392 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
395 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy);
399 if (FT->isVariadic()) {
400 if (FD->getNumParams()) POut << ", ";
406 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
407 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers());
408 if (ThisQuals.hasConst())
410 if (ThisQuals.hasVolatile())
411 Proto += " volatile";
414 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD))
415 AFT->getResultType().getAsStringInternal(Proto, Policy);
420 return Name.str().str();
422 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) {
423 llvm::SmallString<256> Name;
424 llvm::raw_svector_ostream Out(Name);
425 Out << (MD->isInstanceMethod() ? '-' : '+');
428 // For incorrect code, there might not be an ObjCInterfaceDecl. Do
429 // a null check to avoid a crash.
430 if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
433 if (const ObjCCategoryImplDecl *CID =
434 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext()))
435 Out << '(' << CID << ')';
438 Out << MD->getSelector().getAsString();
442 return Name.str().str();
444 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) {
445 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
451 void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) {
455 BitWidth = Val.getBitWidth();
456 unsigned NumWords = Val.getNumWords();
457 const uint64_t* Words = Val.getRawData();
459 pVal = new (C) uint64_t[NumWords];
460 std::copy(Words, Words + NumWords, pVal);
461 } else if (NumWords == 1)
468 IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V,
469 QualType type, SourceLocation l) {
470 return new (C) IntegerLiteral(C, V, type, l);
474 IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) {
475 return new (C) IntegerLiteral(Empty);
479 FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V,
480 bool isexact, QualType Type, SourceLocation L) {
481 return new (C) FloatingLiteral(C, V, isexact, Type, L);
485 FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) {
486 return new (C) FloatingLiteral(Empty);
489 /// getValueAsApproximateDouble - This returns the value as an inaccurate
490 /// double. Note that this may cause loss of precision, but is useful for
491 /// debugging dumps, etc.
492 double FloatingLiteral::getValueAsApproximateDouble() const {
493 llvm::APFloat V = getValue();
495 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
497 return V.convertToDouble();
500 StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData,
501 unsigned ByteLength, bool Wide,
502 bool Pascal, QualType Ty,
503 const SourceLocation *Loc,
505 // Allocate enough space for the StringLiteral plus an array of locations for
506 // any concatenated string tokens.
507 void *Mem = C.Allocate(sizeof(StringLiteral)+
508 sizeof(SourceLocation)*(NumStrs-1),
509 llvm::alignOf<StringLiteral>());
510 StringLiteral *SL = new (Mem) StringLiteral(Ty);
512 // OPTIMIZE: could allocate this appended to the StringLiteral.
513 char *AStrData = new (C, 1) char[ByteLength];
514 memcpy(AStrData, StrData, ByteLength);
515 SL->StrData = AStrData;
516 SL->ByteLength = ByteLength;
518 SL->IsPascal = Pascal;
519 SL->TokLocs[0] = Loc[0];
520 SL->NumConcatenated = NumStrs;
523 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1));
527 StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) {
528 void *Mem = C.Allocate(sizeof(StringLiteral)+
529 sizeof(SourceLocation)*(NumStrs-1),
530 llvm::alignOf<StringLiteral>());
531 StringLiteral *SL = new (Mem) StringLiteral(QualType());
534 SL->NumConcatenated = NumStrs;
538 void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) {
539 char *AStrData = new (C, 1) char[Str.size()];
540 memcpy(AStrData, Str.data(), Str.size());
542 ByteLength = Str.size();
545 /// getLocationOfByte - Return a source location that points to the specified
546 /// byte of this string literal.
548 /// Strings are amazingly complex. They can be formed from multiple tokens and
549 /// can have escape sequences in them in addition to the usual trigraph and
550 /// escaped newline business. This routine handles this complexity.
552 SourceLocation StringLiteral::
553 getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
554 const LangOptions &Features, const TargetInfo &Target) const {
555 assert(!isWide() && "This doesn't work for wide strings yet");
557 // Loop over all of the tokens in this string until we find the one that
558 // contains the byte we're looking for.
561 assert(TokNo < getNumConcatenated() && "Invalid byte number!");
562 SourceLocation StrTokLoc = getStrTokenLoc(TokNo);
564 // Get the spelling of the string so that we can get the data that makes up
565 // the string literal, not the identifier for the macro it is potentially
567 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc);
569 // Re-lex the token to get its length and original spelling.
570 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc);
571 bool Invalid = false;
572 llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid);
574 return StrTokSpellingLoc;
576 const char *StrData = Buffer.data()+LocInfo.second;
578 // Create a langops struct and enable trigraphs. This is sufficient for
580 LangOptions LangOpts;
581 LangOpts.Trigraphs = true;
583 // Create a lexer starting at the beginning of this token.
584 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData,
587 TheLexer.LexFromRawLexer(TheTok);
589 // Use the StringLiteralParser to compute the length of the string in bytes.
590 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target);
591 unsigned TokNumBytes = SLP.GetStringLength();
593 // If the byte is in this token, return the location of the byte.
594 if (ByteNo < TokNumBytes ||
595 (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) {
596 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo);
598 // Now that we know the offset of the token in the spelling, use the
599 // preprocessor to get the offset in the original source.
600 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features);
603 // Move to the next string token.
605 ByteNo -= TokNumBytes;
611 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
612 /// corresponds to, e.g. "sizeof" or "[pre]++".
613 const char *UnaryOperator::getOpcodeStr(Opcode Op) {
615 default: assert(0 && "Unknown unary operator");
616 case UO_PostInc: return "++";
617 case UO_PostDec: return "--";
618 case UO_PreInc: return "++";
619 case UO_PreDec: return "--";
620 case UO_AddrOf: return "&";
621 case UO_Deref: return "*";
622 case UO_Plus: return "+";
623 case UO_Minus: return "-";
624 case UO_Not: return "~";
625 case UO_LNot: return "!";
626 case UO_Real: return "__real";
627 case UO_Imag: return "__imag";
628 case UO_Extension: return "__extension__";
633 UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
635 default: assert(false && "No unary operator for overloaded function");
636 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc;
637 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec;
638 case OO_Amp: return UO_AddrOf;
639 case OO_Star: return UO_Deref;
640 case OO_Plus: return UO_Plus;
641 case OO_Minus: return UO_Minus;
642 case OO_Tilde: return UO_Not;
643 case OO_Exclaim: return UO_LNot;
647 OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
649 case UO_PostInc: case UO_PreInc: return OO_PlusPlus;
650 case UO_PostDec: case UO_PreDec: return OO_MinusMinus;
651 case UO_AddrOf: return OO_Amp;
652 case UO_Deref: return OO_Star;
653 case UO_Plus: return OO_Plus;
654 case UO_Minus: return OO_Minus;
655 case UO_Not: return OO_Tilde;
656 case UO_LNot: return OO_Exclaim;
657 default: return OO_None;
662 //===----------------------------------------------------------------------===//
663 // Postfix Operators.
664 //===----------------------------------------------------------------------===//
666 CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs,
667 Expr **args, unsigned numargs, QualType t, ExprValueKind VK,
668 SourceLocation rparenloc)
669 : Expr(SC, t, VK, OK_Ordinary,
670 fn->isTypeDependent(),
671 fn->isValueDependent(),
672 fn->containsUnexpandedParameterPack()),
675 SubExprs = new (C) Stmt*[numargs+PREARGS_START+NumPreArgs];
677 for (unsigned i = 0; i != numargs; ++i) {
678 if (args[i]->isTypeDependent())
679 ExprBits.TypeDependent = true;
680 if (args[i]->isValueDependent())
681 ExprBits.ValueDependent = true;
682 if (args[i]->containsUnexpandedParameterPack())
683 ExprBits.ContainsUnexpandedParameterPack = true;
685 SubExprs[i+PREARGS_START+NumPreArgs] = args[i];
688 CallExprBits.NumPreArgs = NumPreArgs;
689 RParenLoc = rparenloc;
692 CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs,
693 QualType t, ExprValueKind VK, SourceLocation rparenloc)
694 : Expr(CallExprClass, t, VK, OK_Ordinary,
695 fn->isTypeDependent(),
696 fn->isValueDependent(),
697 fn->containsUnexpandedParameterPack()),
700 SubExprs = new (C) Stmt*[numargs+PREARGS_START];
702 for (unsigned i = 0; i != numargs; ++i) {
703 if (args[i]->isTypeDependent())
704 ExprBits.TypeDependent = true;
705 if (args[i]->isValueDependent())
706 ExprBits.ValueDependent = true;
707 if (args[i]->containsUnexpandedParameterPack())
708 ExprBits.ContainsUnexpandedParameterPack = true;
710 SubExprs[i+PREARGS_START] = args[i];
713 CallExprBits.NumPreArgs = 0;
714 RParenLoc = rparenloc;
717 CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty)
718 : Expr(SC, Empty), SubExprs(0), NumArgs(0) {
719 // FIXME: Why do we allocate this?
720 SubExprs = new (C) Stmt*[PREARGS_START];
721 CallExprBits.NumPreArgs = 0;
724 CallExpr::CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs,
726 : Expr(SC, Empty), SubExprs(0), NumArgs(0) {
727 // FIXME: Why do we allocate this?
728 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs];
729 CallExprBits.NumPreArgs = NumPreArgs;
732 Decl *CallExpr::getCalleeDecl() {
733 Expr *CEE = getCallee()->IgnoreParenCasts();
734 // If we're calling a dereference, look at the pointer instead.
735 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) {
736 if (BO->isPtrMemOp())
737 CEE = BO->getRHS()->IgnoreParenCasts();
738 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) {
739 if (UO->getOpcode() == UO_Deref)
740 CEE = UO->getSubExpr()->IgnoreParenCasts();
742 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE))
743 return DRE->getDecl();
744 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE))
745 return ME->getMemberDecl();
750 FunctionDecl *CallExpr::getDirectCallee() {
751 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl());
754 /// setNumArgs - This changes the number of arguments present in this call.
755 /// Any orphaned expressions are deleted by this, and any new operands are set
757 void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) {
758 // No change, just return.
759 if (NumArgs == getNumArgs()) return;
761 // If shrinking # arguments, just delete the extras and forgot them.
762 if (NumArgs < getNumArgs()) {
763 this->NumArgs = NumArgs;
767 // Otherwise, we are growing the # arguments. New an bigger argument array.
768 unsigned NumPreArgs = getNumPreArgs();
769 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs];
771 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i)
772 NewSubExprs[i] = SubExprs[i];
773 // Null out new args.
774 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs;
775 i != NumArgs+PREARGS_START+NumPreArgs; ++i)
778 if (SubExprs) C.Deallocate(SubExprs);
779 SubExprs = NewSubExprs;
780 this->NumArgs = NumArgs;
783 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If
785 unsigned CallExpr::isBuiltinCall(const ASTContext &Context) const {
786 // All simple function calls (e.g. func()) are implicitly cast to pointer to
787 // function. As a result, we try and obtain the DeclRefExpr from the
789 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
790 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
793 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
797 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
801 if (!FDecl->getIdentifier())
804 return FDecl->getBuiltinID();
807 QualType CallExpr::getCallReturnType() const {
808 QualType CalleeType = getCallee()->getType();
809 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>())
810 CalleeType = FnTypePtr->getPointeeType();
811 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>())
812 CalleeType = BPT->getPointeeType();
813 else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember))
814 // This should never be overloaded and so should never return null.
815 CalleeType = Expr::findBoundMemberType(getCallee());
817 const FunctionType *FnType = CalleeType->castAs<FunctionType>();
818 return FnType->getResultType();
821 SourceRange CallExpr::getSourceRange() const {
822 if (isa<CXXOperatorCallExpr>(this))
823 return cast<CXXOperatorCallExpr>(this)->getSourceRange();
825 SourceLocation begin = getCallee()->getLocStart();
826 if (begin.isInvalid() && getNumArgs() > 0)
827 begin = getArg(0)->getLocStart();
828 SourceLocation end = getRParenLoc();
829 if (end.isInvalid() && getNumArgs() > 0)
830 end = getArg(getNumArgs() - 1)->getLocEnd();
831 return SourceRange(begin, end);
834 OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type,
835 SourceLocation OperatorLoc,
837 OffsetOfNode* compsPtr, unsigned numComps,
838 Expr** exprsPtr, unsigned numExprs,
839 SourceLocation RParenLoc) {
840 void *Mem = C.Allocate(sizeof(OffsetOfExpr) +
841 sizeof(OffsetOfNode) * numComps +
842 sizeof(Expr*) * numExprs);
844 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps,
845 exprsPtr, numExprs, RParenLoc);
848 OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C,
849 unsigned numComps, unsigned numExprs) {
850 void *Mem = C.Allocate(sizeof(OffsetOfExpr) +
851 sizeof(OffsetOfNode) * numComps +
852 sizeof(Expr*) * numExprs);
853 return new (Mem) OffsetOfExpr(numComps, numExprs);
856 OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type,
857 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
858 OffsetOfNode* compsPtr, unsigned numComps,
859 Expr** exprsPtr, unsigned numExprs,
860 SourceLocation RParenLoc)
861 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary,
862 /*TypeDependent=*/false,
863 /*ValueDependent=*/tsi->getType()->isDependentType(),
864 tsi->getType()->containsUnexpandedParameterPack()),
865 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi),
866 NumComps(numComps), NumExprs(numExprs)
868 for(unsigned i = 0; i < numComps; ++i) {
869 setComponent(i, compsPtr[i]);
872 for(unsigned i = 0; i < numExprs; ++i) {
873 if (exprsPtr[i]->isTypeDependent() || exprsPtr[i]->isValueDependent())
874 ExprBits.ValueDependent = true;
875 if (exprsPtr[i]->containsUnexpandedParameterPack())
876 ExprBits.ContainsUnexpandedParameterPack = true;
878 setIndexExpr(i, exprsPtr[i]);
882 IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const {
883 assert(getKind() == Field || getKind() == Identifier);
884 if (getKind() == Field)
885 return getField()->getIdentifier();
887 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask);
890 MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow,
891 NestedNameSpecifierLoc QualifierLoc,
892 ValueDecl *memberdecl,
893 DeclAccessPair founddecl,
894 DeclarationNameInfo nameinfo,
895 const TemplateArgumentListInfo *targs,
899 std::size_t Size = sizeof(MemberExpr);
901 bool hasQualOrFound = (QualifierLoc ||
902 founddecl.getDecl() != memberdecl ||
903 founddecl.getAccess() != memberdecl->getAccess());
905 Size += sizeof(MemberNameQualifier);
908 Size += ExplicitTemplateArgumentList::sizeFor(*targs);
910 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>());
911 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo,
914 if (hasQualOrFound) {
915 // FIXME: Wrong. We should be looking at the member declaration we found.
916 if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) {
917 E->setValueDependent(true);
918 E->setTypeDependent(true);
920 E->HasQualifierOrFoundDecl = true;
922 MemberNameQualifier *NQ = E->getMemberQualifier();
923 NQ->QualifierLoc = QualifierLoc;
924 NQ->FoundDecl = founddecl;
928 E->HasExplicitTemplateArgumentList = true;
929 E->getExplicitTemplateArgs().initializeFrom(*targs);
935 SourceRange MemberExpr::getSourceRange() const {
936 SourceLocation StartLoc;
937 if (isImplicitAccess()) {
939 StartLoc = getQualifierLoc().getBeginLoc();
941 StartLoc = MemberLoc;
943 // FIXME: We don't want this to happen. Rather, we should be able to
944 // detect all kinds of implicit accesses more cleanly.
945 StartLoc = getBase()->getLocStart();
946 if (StartLoc.isInvalid())
947 StartLoc = MemberLoc;
950 SourceLocation EndLoc =
951 HasExplicitTemplateArgumentList? getRAngleLoc()
952 : getMemberNameInfo().getEndLoc();
954 return SourceRange(StartLoc, EndLoc);
957 const char *CastExpr::getCastKindName() const {
958 switch (getCastKind()) {
963 case CK_LValueBitCast:
964 return "LValueBitCast";
965 case CK_LValueToRValue:
966 return "LValueToRValue";
967 case CK_GetObjCProperty:
968 return "GetObjCProperty";
971 case CK_BaseToDerived:
972 return "BaseToDerived";
973 case CK_DerivedToBase:
974 return "DerivedToBase";
975 case CK_UncheckedDerivedToBase:
976 return "UncheckedDerivedToBase";
981 case CK_ArrayToPointerDecay:
982 return "ArrayToPointerDecay";
983 case CK_FunctionToPointerDecay:
984 return "FunctionToPointerDecay";
985 case CK_NullToMemberPointer:
986 return "NullToMemberPointer";
987 case CK_NullToPointer:
988 return "NullToPointer";
989 case CK_BaseToDerivedMemberPointer:
990 return "BaseToDerivedMemberPointer";
991 case CK_DerivedToBaseMemberPointer:
992 return "DerivedToBaseMemberPointer";
993 case CK_UserDefinedConversion:
994 return "UserDefinedConversion";
995 case CK_ConstructorConversion:
996 return "ConstructorConversion";
997 case CK_IntegralToPointer:
998 return "IntegralToPointer";
999 case CK_PointerToIntegral:
1000 return "PointerToIntegral";
1001 case CK_PointerToBoolean:
1002 return "PointerToBoolean";
1005 case CK_VectorSplat:
1006 return "VectorSplat";
1007 case CK_IntegralCast:
1008 return "IntegralCast";
1009 case CK_IntegralToBoolean:
1010 return "IntegralToBoolean";
1011 case CK_IntegralToFloating:
1012 return "IntegralToFloating";
1013 case CK_FloatingToIntegral:
1014 return "FloatingToIntegral";
1015 case CK_FloatingCast:
1016 return "FloatingCast";
1017 case CK_FloatingToBoolean:
1018 return "FloatingToBoolean";
1019 case CK_MemberPointerToBoolean:
1020 return "MemberPointerToBoolean";
1021 case CK_AnyPointerToObjCPointerCast:
1022 return "AnyPointerToObjCPointerCast";
1023 case CK_AnyPointerToBlockPointerCast:
1024 return "AnyPointerToBlockPointerCast";
1025 case CK_ObjCObjectLValueCast:
1026 return "ObjCObjectLValueCast";
1027 case CK_FloatingRealToComplex:
1028 return "FloatingRealToComplex";
1029 case CK_FloatingComplexToReal:
1030 return "FloatingComplexToReal";
1031 case CK_FloatingComplexToBoolean:
1032 return "FloatingComplexToBoolean";
1033 case CK_FloatingComplexCast:
1034 return "FloatingComplexCast";
1035 case CK_FloatingComplexToIntegralComplex:
1036 return "FloatingComplexToIntegralComplex";
1037 case CK_IntegralRealToComplex:
1038 return "IntegralRealToComplex";
1039 case CK_IntegralComplexToReal:
1040 return "IntegralComplexToReal";
1041 case CK_IntegralComplexToBoolean:
1042 return "IntegralComplexToBoolean";
1043 case CK_IntegralComplexCast:
1044 return "IntegralComplexCast";
1045 case CK_IntegralComplexToFloatingComplex:
1046 return "IntegralComplexToFloatingComplex";
1049 llvm_unreachable("Unhandled cast kind!");
1053 Expr *CastExpr::getSubExprAsWritten() {
1057 SubExpr = E->getSubExpr();
1059 // Skip any temporary bindings; they're implicit.
1060 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
1061 SubExpr = Binder->getSubExpr();
1063 // Conversions by constructor and conversion functions have a
1064 // subexpression describing the call; strip it off.
1065 if (E->getCastKind() == CK_ConstructorConversion)
1066 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0);
1067 else if (E->getCastKind() == CK_UserDefinedConversion)
1068 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument();
1070 // If the subexpression we're left with is an implicit cast, look
1071 // through that, too.
1072 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr)));
1077 CXXBaseSpecifier **CastExpr::path_buffer() {
1078 switch (getStmtClass()) {
1079 #define ABSTRACT_STMT(x)
1080 #define CASTEXPR(Type, Base) \
1081 case Stmt::Type##Class: \
1082 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1);
1083 #define STMT(Type, Base)
1084 #include "clang/AST/StmtNodes.inc"
1086 llvm_unreachable("non-cast expressions not possible here");
1091 void CastExpr::setCastPath(const CXXCastPath &Path) {
1092 assert(Path.size() == path_size());
1093 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*));
1096 ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T,
1097 CastKind Kind, Expr *Operand,
1098 const CXXCastPath *BasePath,
1100 unsigned PathSize = (BasePath ? BasePath->size() : 0);
1102 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
1103 ImplicitCastExpr *E =
1104 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK);
1105 if (PathSize) E->setCastPath(*BasePath);
1109 ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C,
1110 unsigned PathSize) {
1112 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
1113 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize);
1117 CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T,
1118 ExprValueKind VK, CastKind K, Expr *Op,
1119 const CXXCastPath *BasePath,
1120 TypeSourceInfo *WrittenTy,
1121 SourceLocation L, SourceLocation R) {
1122 unsigned PathSize = (BasePath ? BasePath->size() : 0);
1124 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
1126 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R);
1127 if (PathSize) E->setCastPath(*BasePath);
1131 CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) {
1133 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*));
1134 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize);
1137 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1138 /// corresponds to, e.g. "<<=".
1139 const char *BinaryOperator::getOpcodeStr(Opcode Op) {
1141 case BO_PtrMemD: return ".*";
1142 case BO_PtrMemI: return "->*";
1143 case BO_Mul: return "*";
1144 case BO_Div: return "/";
1145 case BO_Rem: return "%";
1146 case BO_Add: return "+";
1147 case BO_Sub: return "-";
1148 case BO_Shl: return "<<";
1149 case BO_Shr: return ">>";
1150 case BO_LT: return "<";
1151 case BO_GT: return ">";
1152 case BO_LE: return "<=";
1153 case BO_GE: return ">=";
1154 case BO_EQ: return "==";
1155 case BO_NE: return "!=";
1156 case BO_And: return "&";
1157 case BO_Xor: return "^";
1158 case BO_Or: return "|";
1159 case BO_LAnd: return "&&";
1160 case BO_LOr: return "||";
1161 case BO_Assign: return "=";
1162 case BO_MulAssign: return "*=";
1163 case BO_DivAssign: return "/=";
1164 case BO_RemAssign: return "%=";
1165 case BO_AddAssign: return "+=";
1166 case BO_SubAssign: return "-=";
1167 case BO_ShlAssign: return "<<=";
1168 case BO_ShrAssign: return ">>=";
1169 case BO_AndAssign: return "&=";
1170 case BO_XorAssign: return "^=";
1171 case BO_OrAssign: return "|=";
1172 case BO_Comma: return ",";
1179 BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
1181 default: assert(false && "Not an overloadable binary operator");
1182 case OO_Plus: return BO_Add;
1183 case OO_Minus: return BO_Sub;
1184 case OO_Star: return BO_Mul;
1185 case OO_Slash: return BO_Div;
1186 case OO_Percent: return BO_Rem;
1187 case OO_Caret: return BO_Xor;
1188 case OO_Amp: return BO_And;
1189 case OO_Pipe: return BO_Or;
1190 case OO_Equal: return BO_Assign;
1191 case OO_Less: return BO_LT;
1192 case OO_Greater: return BO_GT;
1193 case OO_PlusEqual: return BO_AddAssign;
1194 case OO_MinusEqual: return BO_SubAssign;
1195 case OO_StarEqual: return BO_MulAssign;
1196 case OO_SlashEqual: return BO_DivAssign;
1197 case OO_PercentEqual: return BO_RemAssign;
1198 case OO_CaretEqual: return BO_XorAssign;
1199 case OO_AmpEqual: return BO_AndAssign;
1200 case OO_PipeEqual: return BO_OrAssign;
1201 case OO_LessLess: return BO_Shl;
1202 case OO_GreaterGreater: return BO_Shr;
1203 case OO_LessLessEqual: return BO_ShlAssign;
1204 case OO_GreaterGreaterEqual: return BO_ShrAssign;
1205 case OO_EqualEqual: return BO_EQ;
1206 case OO_ExclaimEqual: return BO_NE;
1207 case OO_LessEqual: return BO_LE;
1208 case OO_GreaterEqual: return BO_GE;
1209 case OO_AmpAmp: return BO_LAnd;
1210 case OO_PipePipe: return BO_LOr;
1211 case OO_Comma: return BO_Comma;
1212 case OO_ArrowStar: return BO_PtrMemI;
1216 OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
1217 static const OverloadedOperatorKind OverOps[] = {
1218 /* .* Cannot be overloaded */OO_None, OO_ArrowStar,
1219 OO_Star, OO_Slash, OO_Percent,
1221 OO_LessLess, OO_GreaterGreater,
1222 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
1223 OO_EqualEqual, OO_ExclaimEqual,
1229 OO_Equal, OO_StarEqual,
1230 OO_SlashEqual, OO_PercentEqual,
1231 OO_PlusEqual, OO_MinusEqual,
1232 OO_LessLessEqual, OO_GreaterGreaterEqual,
1233 OO_AmpEqual, OO_CaretEqual,
1237 return OverOps[Opc];
1240 InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc,
1241 Expr **initExprs, unsigned numInits,
1242 SourceLocation rbraceloc)
1243 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false,
1245 InitExprs(C, numInits),
1246 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0),
1247 HadArrayRangeDesignator(false)
1249 for (unsigned I = 0; I != numInits; ++I) {
1250 if (initExprs[I]->isTypeDependent())
1251 ExprBits.TypeDependent = true;
1252 if (initExprs[I]->isValueDependent())
1253 ExprBits.ValueDependent = true;
1254 if (initExprs[I]->containsUnexpandedParameterPack())
1255 ExprBits.ContainsUnexpandedParameterPack = true;
1258 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits);
1261 void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) {
1262 if (NumInits > InitExprs.size())
1263 InitExprs.reserve(C, NumInits);
1266 void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) {
1267 InitExprs.resize(C, NumInits, 0);
1270 Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) {
1271 if (Init >= InitExprs.size()) {
1272 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0);
1273 InitExprs.back() = expr;
1277 Expr *Result = cast_or_null<Expr>(InitExprs[Init]);
1278 InitExprs[Init] = expr;
1282 void InitListExpr::setArrayFiller(Expr *filler) {
1283 ArrayFillerOrUnionFieldInit = filler;
1284 // Fill out any "holes" in the array due to designated initializers.
1285 Expr **inits = getInits();
1286 for (unsigned i = 0, e = getNumInits(); i != e; ++i)
1291 SourceRange InitListExpr::getSourceRange() const {
1293 return SyntacticForm->getSourceRange();
1294 SourceLocation Beg = LBraceLoc, End = RBraceLoc;
1295 if (Beg.isInvalid()) {
1296 // Find the first non-null initializer.
1297 for (InitExprsTy::const_iterator I = InitExprs.begin(),
1298 E = InitExprs.end();
1301 Beg = S->getLocStart();
1306 if (End.isInvalid()) {
1307 // Find the first non-null initializer from the end.
1308 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(),
1309 E = InitExprs.rend();
1312 End = S->getSourceRange().getEnd();
1317 return SourceRange(Beg, End);
1320 /// getFunctionType - Return the underlying function type for this block.
1322 const FunctionType *BlockExpr::getFunctionType() const {
1323 return getType()->getAs<BlockPointerType>()->
1324 getPointeeType()->getAs<FunctionType>();
1327 SourceLocation BlockExpr::getCaretLocation() const {
1328 return TheBlock->getCaretLocation();
1330 const Stmt *BlockExpr::getBody() const {
1331 return TheBlock->getBody();
1333 Stmt *BlockExpr::getBody() {
1334 return TheBlock->getBody();
1338 //===----------------------------------------------------------------------===//
1339 // Generic Expression Routines
1340 //===----------------------------------------------------------------------===//
1342 /// isUnusedResultAWarning - Return true if this immediate expression should
1343 /// be warned about if the result is unused. If so, fill in Loc and Ranges
1344 /// with location to warn on and the source range[s] to report with the
1346 bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
1347 SourceRange &R2, ASTContext &Ctx) const {
1348 // Don't warn if the expr is type dependent. The type could end up
1349 // instantiating to void.
1350 if (isTypeDependent())
1353 switch (getStmtClass()) {
1355 if (getType()->isVoidType())
1358 R1 = getSourceRange();
1360 case ParenExprClass:
1361 return cast<ParenExpr>(this)->getSubExpr()->
1362 isUnusedResultAWarning(Loc, R1, R2, Ctx);
1363 case GenericSelectionExprClass:
1364 return cast<GenericSelectionExpr>(this)->getResultExpr()->
1365 isUnusedResultAWarning(Loc, R1, R2, Ctx);
1366 case UnaryOperatorClass: {
1367 const UnaryOperator *UO = cast<UnaryOperator>(this);
1369 switch (UO->getOpcode()) {
1374 case UO_PreDec: // ++/--
1375 return false; // Not a warning.
1377 // Dereferencing a volatile pointer is a side-effect.
1378 if (Ctx.getCanonicalType(getType()).isVolatileQualified())
1383 // accessing a piece of a volatile complex is a side-effect.
1384 if (Ctx.getCanonicalType(UO->getSubExpr()->getType())
1385 .isVolatileQualified())
1389 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1391 Loc = UO->getOperatorLoc();
1392 R1 = UO->getSubExpr()->getSourceRange();
1395 case BinaryOperatorClass: {
1396 const BinaryOperator *BO = cast<BinaryOperator>(this);
1397 switch (BO->getOpcode()) {
1400 // Consider the RHS of comma for side effects. LHS was checked by
1401 // Sema::CheckCommaOperands.
1403 // ((foo = <blah>), 0) is an idiom for hiding the result (and
1404 // lvalue-ness) of an assignment written in a macro.
1405 if (IntegerLiteral *IE =
1406 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens()))
1407 if (IE->getValue() == 0)
1409 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1410 // Consider '||', '&&' to have side effects if the LHS or RHS does.
1413 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) ||
1414 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx))
1418 if (BO->isAssignmentOp())
1420 Loc = BO->getOperatorLoc();
1421 R1 = BO->getLHS()->getSourceRange();
1422 R2 = BO->getRHS()->getSourceRange();
1425 case CompoundAssignOperatorClass:
1426 case VAArgExprClass:
1429 case ConditionalOperatorClass: {
1430 // If only one of the LHS or RHS is a warning, the operator might
1431 // be being used for control flow. Only warn if both the LHS and
1432 // RHS are warnings.
1433 const ConditionalOperator *Exp = cast<ConditionalOperator>(this);
1434 if (!Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx))
1438 return Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1441 case MemberExprClass:
1442 // If the base pointer or element is to a volatile pointer/field, accessing
1443 // it is a side effect.
1444 if (Ctx.getCanonicalType(getType()).isVolatileQualified())
1446 Loc = cast<MemberExpr>(this)->getMemberLoc();
1447 R1 = SourceRange(Loc, Loc);
1448 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange();
1451 case ArraySubscriptExprClass:
1452 // If the base pointer or element is to a volatile pointer/field, accessing
1453 // it is a side effect.
1454 if (Ctx.getCanonicalType(getType()).isVolatileQualified())
1456 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
1457 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
1458 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
1462 case CXXOperatorCallExprClass:
1463 case CXXMemberCallExprClass: {
1464 // If this is a direct call, get the callee.
1465 const CallExpr *CE = cast<CallExpr>(this);
1466 if (const Decl *FD = CE->getCalleeDecl()) {
1467 // If the callee has attribute pure, const, or warn_unused_result, warn
1468 // about it. void foo() { strlen("bar"); } should warn.
1470 // Note: If new cases are added here, DiagnoseUnusedExprResult should be
1471 // updated to match for QoI.
1472 if (FD->getAttr<WarnUnusedResultAttr>() ||
1473 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) {
1474 Loc = CE->getCallee()->getLocStart();
1475 R1 = CE->getCallee()->getSourceRange();
1477 if (unsigned NumArgs = CE->getNumArgs())
1478 R2 = SourceRange(CE->getArg(0)->getLocStart(),
1479 CE->getArg(NumArgs-1)->getLocEnd());
1486 case CXXTemporaryObjectExprClass:
1487 case CXXConstructExprClass:
1490 case ObjCMessageExprClass: {
1491 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this);
1492 const ObjCMethodDecl *MD = ME->getMethodDecl();
1493 if (MD && MD->getAttr<WarnUnusedResultAttr>()) {
1500 case ObjCPropertyRefExprClass:
1502 R1 = getSourceRange();
1505 case StmtExprClass: {
1506 // Statement exprs don't logically have side effects themselves, but are
1507 // sometimes used in macros in ways that give them a type that is unused.
1508 // For example ({ blah; foo(); }) will end up with a type if foo has a type.
1509 // however, if the result of the stmt expr is dead, we don't want to emit a
1511 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt();
1512 if (!CS->body_empty()) {
1513 if (const Expr *E = dyn_cast<Expr>(CS->body_back()))
1514 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1515 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back()))
1516 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt()))
1517 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx);
1520 if (getType()->isVoidType())
1522 Loc = cast<StmtExpr>(this)->getLParenLoc();
1523 R1 = getSourceRange();
1526 case CStyleCastExprClass:
1527 // If this is an explicit cast to void, allow it. People do this when they
1528 // think they know what they're doing :).
1529 if (getType()->isVoidType())
1531 Loc = cast<CStyleCastExpr>(this)->getLParenLoc();
1532 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange();
1534 case CXXFunctionalCastExprClass: {
1535 if (getType()->isVoidType())
1537 const CastExpr *CE = cast<CastExpr>(this);
1539 // If this is a cast to void or a constructor conversion, check the operand.
1540 // Otherwise, the result of the cast is unused.
1541 if (CE->getCastKind() == CK_ToVoid ||
1542 CE->getCastKind() == CK_ConstructorConversion)
1543 return (cast<CastExpr>(this)->getSubExpr()
1544 ->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1545 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc();
1546 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange();
1550 case ImplicitCastExprClass:
1551 // Check the operand, since implicit casts are inserted by Sema
1552 return (cast<ImplicitCastExpr>(this)
1553 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1555 case CXXDefaultArgExprClass:
1556 return (cast<CXXDefaultArgExpr>(this)
1557 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1559 case CXXNewExprClass:
1560 // FIXME: In theory, there might be new expressions that don't have side
1561 // effects (e.g. a placement new with an uninitialized POD).
1562 case CXXDeleteExprClass:
1564 case CXXBindTemporaryExprClass:
1565 return (cast<CXXBindTemporaryExpr>(this)
1566 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1567 case ExprWithCleanupsClass:
1568 return (cast<ExprWithCleanups>(this)
1569 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx));
1573 /// isOBJCGCCandidate - Check if an expression is objc gc'able.
1574 /// returns true, if it is; false otherwise.
1575 bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
1576 const Expr *E = IgnoreParens();
1577 switch (E->getStmtClass()) {
1580 case ObjCIvarRefExprClass:
1582 case Expr::UnaryOperatorClass:
1583 return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
1584 case ImplicitCastExprClass:
1585 return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
1586 case CStyleCastExprClass:
1587 return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
1588 case DeclRefExprClass: {
1589 const Decl *D = cast<DeclRefExpr>(E)->getDecl();
1590 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1591 if (VD->hasGlobalStorage())
1593 QualType T = VD->getType();
1594 // dereferencing to a pointer is always a gc'able candidate,
1595 // unless it is __weak.
1596 return T->isPointerType() &&
1597 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak);
1601 case MemberExprClass: {
1602 const MemberExpr *M = cast<MemberExpr>(E);
1603 return M->getBase()->isOBJCGCCandidate(Ctx);
1605 case ArraySubscriptExprClass:
1606 return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx);
1610 bool Expr::isBoundMemberFunction(ASTContext &Ctx) const {
1611 if (isTypeDependent())
1613 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction;
1616 QualType Expr::findBoundMemberType(const Expr *expr) {
1617 assert(expr->getType()->isSpecificPlaceholderType(BuiltinType::BoundMember));
1619 // Bound member expressions are always one of these possibilities:
1620 // x->m x.m x->*y x.*y
1621 // (possibly parenthesized)
1623 expr = expr->IgnoreParens();
1624 if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) {
1625 assert(isa<CXXMethodDecl>(mem->getMemberDecl()));
1626 return mem->getMemberDecl()->getType();
1629 if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) {
1630 QualType type = op->getRHS()->getType()->castAs<MemberPointerType>()
1632 assert(type->isFunctionType());
1636 assert(isa<UnresolvedMemberExpr>(expr));
1640 static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1,
1641 Expr::CanThrowResult CT2) {
1642 // CanThrowResult constants are ordered so that the maximum is the correct
1644 return CT1 > CT2 ? CT1 : CT2;
1647 static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) {
1648 Expr *E = const_cast<Expr*>(CE);
1649 Expr::CanThrowResult R = Expr::CT_Cannot;
1650 for (Expr::child_range I = E->children(); I && R != Expr::CT_Can; ++I) {
1651 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C));
1656 static Expr::CanThrowResult CanCalleeThrow(ASTContext &Ctx, const Decl *D,
1657 bool NullThrows = true) {
1659 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot;
1661 // See if we can get a function type from the decl somehow.
1662 const ValueDecl *VD = dyn_cast<ValueDecl>(D);
1663 if (!VD) // If we have no clue what we're calling, assume the worst.
1664 return Expr::CT_Can;
1666 // As an extension, we assume that __attribute__((nothrow)) functions don't
1668 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>())
1669 return Expr::CT_Cannot;
1671 QualType T = VD->getType();
1672 const FunctionProtoType *FT;
1673 if ((FT = T->getAs<FunctionProtoType>())) {
1674 } else if (const PointerType *PT = T->getAs<PointerType>())
1675 FT = PT->getPointeeType()->getAs<FunctionProtoType>();
1676 else if (const ReferenceType *RT = T->getAs<ReferenceType>())
1677 FT = RT->getPointeeType()->getAs<FunctionProtoType>();
1678 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>())
1679 FT = MT->getPointeeType()->getAs<FunctionProtoType>();
1680 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>())
1681 FT = BT->getPointeeType()->getAs<FunctionProtoType>();
1684 return Expr::CT_Can;
1686 return FT->isNothrow(Ctx) ? Expr::CT_Cannot : Expr::CT_Can;
1689 static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) {
1690 if (DC->isTypeDependent())
1691 return Expr::CT_Dependent;
1693 if (!DC->getTypeAsWritten()->isReferenceType())
1694 return Expr::CT_Cannot;
1696 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot;
1699 static Expr::CanThrowResult CanTypeidThrow(ASTContext &C,
1700 const CXXTypeidExpr *DC) {
1701 if (DC->isTypeOperand())
1702 return Expr::CT_Cannot;
1704 Expr *Op = DC->getExprOperand();
1705 if (Op->isTypeDependent())
1706 return Expr::CT_Dependent;
1708 const RecordType *RT = Op->getType()->getAs<RecordType>();
1710 return Expr::CT_Cannot;
1712 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic())
1713 return Expr::CT_Cannot;
1715 if (Op->Classify(C).isPRValue())
1716 return Expr::CT_Cannot;
1718 return Expr::CT_Can;
1721 Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const {
1722 // C++ [expr.unary.noexcept]p3:
1723 // [Can throw] if in a potentially-evaluated context the expression would
1725 switch (getStmtClass()) {
1726 case CXXThrowExprClass:
1727 // - a potentially evaluated throw-expression
1730 case CXXDynamicCastExprClass: {
1731 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v),
1732 // where T is a reference type, that requires a run-time check
1733 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this));
1736 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1739 case CXXTypeidExprClass:
1740 // - a potentially evaluated typeid expression applied to a glvalue
1741 // expression whose type is a polymorphic class type
1742 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this));
1744 // - a potentially evaluated call to a function, member function, function
1745 // pointer, or member function pointer that does not have a non-throwing
1746 // exception-specification
1748 case CXXOperatorCallExprClass:
1749 case CXXMemberCallExprClass: {
1750 CanThrowResult CT = CanCalleeThrow(C,cast<CallExpr>(this)->getCalleeDecl());
1753 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1756 case CXXConstructExprClass:
1757 case CXXTemporaryObjectExprClass: {
1758 CanThrowResult CT = CanCalleeThrow(C,
1759 cast<CXXConstructExpr>(this)->getConstructor());
1762 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1765 case CXXNewExprClass: {
1766 CanThrowResult CT = MergeCanThrow(
1767 CanCalleeThrow(C, cast<CXXNewExpr>(this)->getOperatorNew()),
1768 CanCalleeThrow(C, cast<CXXNewExpr>(this)->getConstructor(),
1769 /*NullThrows*/false));
1772 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1775 case CXXDeleteExprClass: {
1776 CanThrowResult CT = CanCalleeThrow(C,
1777 cast<CXXDeleteExpr>(this)->getOperatorDelete());
1780 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument();
1781 // Unwrap exactly one implicit cast, which converts all pointers to void*.
1782 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg))
1783 Arg = Cast->getSubExpr();
1784 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) {
1785 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) {
1786 CanThrowResult CT2 = CanCalleeThrow(C,
1787 cast<CXXRecordDecl>(RT->getDecl())->getDestructor());
1790 CT = MergeCanThrow(CT, CT2);
1793 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1796 case CXXBindTemporaryExprClass: {
1797 // The bound temporary has to be destroyed again, which might throw.
1798 CanThrowResult CT = CanCalleeThrow(C,
1799 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor());
1802 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1805 // ObjC message sends are like function calls, but never have exception
1807 case ObjCMessageExprClass:
1808 case ObjCPropertyRefExprClass:
1811 // Many other things have subexpressions, so we have to test those.
1813 case ParenExprClass:
1814 case MemberExprClass:
1815 case CXXReinterpretCastExprClass:
1816 case CXXConstCastExprClass:
1817 case ConditionalOperatorClass:
1818 case CompoundLiteralExprClass:
1819 case ExtVectorElementExprClass:
1820 case InitListExprClass:
1821 case DesignatedInitExprClass:
1822 case ParenListExprClass:
1823 case VAArgExprClass:
1824 case CXXDefaultArgExprClass:
1825 case ExprWithCleanupsClass:
1826 case ObjCIvarRefExprClass:
1827 case ObjCIsaExprClass:
1828 case ShuffleVectorExprClass:
1829 return CanSubExprsThrow(C, this);
1831 // Some might be dependent for other reasons.
1832 case UnaryOperatorClass:
1833 case ArraySubscriptExprClass:
1834 case ImplicitCastExprClass:
1835 case CStyleCastExprClass:
1836 case CXXStaticCastExprClass:
1837 case CXXFunctionalCastExprClass:
1838 case BinaryOperatorClass:
1839 case CompoundAssignOperatorClass: {
1840 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot;
1841 return MergeCanThrow(CT, CanSubExprsThrow(C, this));
1844 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms.
1848 case ChooseExprClass:
1849 if (isTypeDependent() || isValueDependent())
1850 return CT_Dependent;
1851 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C);
1853 case GenericSelectionExprClass:
1854 if (cast<GenericSelectionExpr>(this)->isResultDependent())
1855 return CT_Dependent;
1856 return cast<GenericSelectionExpr>(this)->getResultExpr()->CanThrow(C);
1858 // Some expressions are always dependent.
1859 case DependentScopeDeclRefExprClass:
1860 case CXXUnresolvedConstructExprClass:
1861 case CXXDependentScopeMemberExprClass:
1862 return CT_Dependent;
1865 // All other expressions don't have subexpressions, or else they are
1871 Expr* Expr::IgnoreParens() {
1874 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) {
1875 E = P->getSubExpr();
1878 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
1879 if (P->getOpcode() == UO_Extension) {
1880 E = P->getSubExpr();
1884 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
1885 if (!P->isResultDependent()) {
1886 E = P->getResultExpr();
1894 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr
1895 /// or CastExprs or ImplicitCastExprs, returning their operand.
1896 Expr *Expr::IgnoreParenCasts() {
1899 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) {
1900 E = P->getSubExpr();
1903 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
1904 E = P->getSubExpr();
1907 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
1908 if (P->getOpcode() == UO_Extension) {
1909 E = P->getSubExpr();
1913 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
1914 if (!P->isResultDependent()) {
1915 E = P->getResultExpr();
1923 /// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue
1924 /// casts. This is intended purely as a temporary workaround for code
1925 /// that hasn't yet been rewritten to do the right thing about those
1926 /// casts, and may disappear along with the last internal use.
1927 Expr *Expr::IgnoreParenLValueCasts() {
1930 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
1931 E = P->getSubExpr();
1933 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) {
1934 if (P->getCastKind() == CK_LValueToRValue) {
1935 E = P->getSubExpr();
1938 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
1939 if (P->getOpcode() == UO_Extension) {
1940 E = P->getSubExpr();
1943 } else if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
1944 if (!P->isResultDependent()) {
1945 E = P->getResultExpr();
1954 Expr *Expr::IgnoreParenImpCasts() {
1957 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
1958 E = P->getSubExpr();
1961 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) {
1962 E = P->getSubExpr();
1965 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
1966 if (P->getOpcode() == UO_Extension) {
1967 E = P->getSubExpr();
1971 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
1972 if (!P->isResultDependent()) {
1973 E = P->getResultExpr();
1981 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the
1982 /// value (including ptr->int casts of the same size). Strip off any
1983 /// ParenExpr or CastExprs, returning their operand.
1984 Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) {
1987 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
1988 E = P->getSubExpr();
1992 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
1993 // We ignore integer <-> casts that are of the same width, ptr<->ptr and
1994 // ptr<->int casts of the same width. We also ignore all identity casts.
1995 Expr *SE = P->getSubExpr();
1997 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) {
2002 if ((E->getType()->isPointerType() ||
2003 E->getType()->isIntegralType(Ctx)) &&
2004 (SE->getType()->isPointerType() ||
2005 SE->getType()->isIntegralType(Ctx)) &&
2006 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) {
2012 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
2013 if (P->getOpcode() == UO_Extension) {
2014 E = P->getSubExpr();
2019 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
2020 if (!P->isResultDependent()) {
2021 E = P->getResultExpr();
2030 bool Expr::isDefaultArgument() const {
2031 const Expr *E = this;
2032 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
2033 E = ICE->getSubExprAsWritten();
2035 return isa<CXXDefaultArgExpr>(E);
2038 /// \brief Skip over any no-op casts and any temporary-binding
2040 static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) {
2041 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2042 if (ICE->getCastKind() == CK_NoOp)
2043 E = ICE->getSubExpr();
2048 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E))
2049 E = BE->getSubExpr();
2051 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2052 if (ICE->getCastKind() == CK_NoOp)
2053 E = ICE->getSubExpr();
2058 return E->IgnoreParens();
2061 /// isTemporaryObject - Determines if this expression produces a
2062 /// temporary of the given class type.
2063 bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const {
2064 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy)))
2067 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this);
2069 // Temporaries are by definition pr-values of class type.
2070 if (!E->Classify(C).isPRValue()) {
2071 // In this context, property reference is a message call and is pr-value.
2072 if (!isa<ObjCPropertyRefExpr>(E))
2076 // Black-list a few cases which yield pr-values of class type that don't
2077 // refer to temporaries of that type:
2079 // - implicit derived-to-base conversions
2080 if (isa<ImplicitCastExpr>(E)) {
2081 switch (cast<ImplicitCastExpr>(E)->getCastKind()) {
2082 case CK_DerivedToBase:
2083 case CK_UncheckedDerivedToBase:
2090 // - member expressions (all)
2091 if (isa<MemberExpr>(E))
2094 // - opaque values (all)
2095 if (isa<OpaqueValueExpr>(E))
2101 bool Expr::isImplicitCXXThis() const {
2102 const Expr *E = this;
2104 // Strip away parentheses and casts we don't care about.
2106 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) {
2107 E = Paren->getSubExpr();
2111 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2112 if (ICE->getCastKind() == CK_NoOp ||
2113 ICE->getCastKind() == CK_LValueToRValue ||
2114 ICE->getCastKind() == CK_DerivedToBase ||
2115 ICE->getCastKind() == CK_UncheckedDerivedToBase) {
2116 E = ICE->getSubExpr();
2121 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) {
2122 if (UnOp->getOpcode() == UO_Extension) {
2123 E = UnOp->getSubExpr();
2131 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E))
2132 return This->isImplicit();
2137 /// hasAnyTypeDependentArguments - Determines if any of the expressions
2138 /// in Exprs is type-dependent.
2139 bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) {
2140 for (unsigned I = 0; I < NumExprs; ++I)
2141 if (Exprs[I]->isTypeDependent())
2147 /// hasAnyValueDependentArguments - Determines if any of the expressions
2148 /// in Exprs is value-dependent.
2149 bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) {
2150 for (unsigned I = 0; I < NumExprs; ++I)
2151 if (Exprs[I]->isValueDependent())
2157 bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const {
2158 // This function is attempting whether an expression is an initializer
2159 // which can be evaluated at compile-time. isEvaluatable handles most
2160 // of the cases, but it can't deal with some initializer-specific
2161 // expressions, and it can't deal with aggregates; we deal with those here,
2162 // and fall back to isEvaluatable for the other cases.
2164 // If we ever capture reference-binding directly in the AST, we can
2165 // kill the second parameter.
2169 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects;
2172 switch (getStmtClass()) {
2174 case StringLiteralClass:
2175 case ObjCStringLiteralClass:
2176 case ObjCEncodeExprClass:
2178 case CXXTemporaryObjectExprClass:
2179 case CXXConstructExprClass: {
2180 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this);
2183 // 1) an application of the trivial default constructor or
2184 if (!CE->getConstructor()->isTrivial()) return false;
2185 if (!CE->getNumArgs()) return true;
2187 // 2) an elidable trivial copy construction of an operand which is
2188 // itself a constant initializer. Note that we consider the
2189 // operand on its own, *not* as a reference binding.
2190 return CE->isElidable() &&
2191 CE->getArg(0)->isConstantInitializer(Ctx, false);
2193 case CompoundLiteralExprClass: {
2194 // This handles gcc's extension that allows global initializers like
2195 // "struct x {int x;} x = (struct x) {};".
2196 // FIXME: This accepts other cases it shouldn't!
2197 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer();
2198 return Exp->isConstantInitializer(Ctx, false);
2200 case InitListExprClass: {
2201 // FIXME: This doesn't deal with fields with reference types correctly.
2202 // FIXME: This incorrectly allows pointers cast to integers to be assigned
2204 const InitListExpr *Exp = cast<InitListExpr>(this);
2205 unsigned numInits = Exp->getNumInits();
2206 for (unsigned i = 0; i < numInits; i++) {
2207 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false))
2212 case ImplicitValueInitExprClass:
2214 case ParenExprClass:
2215 return cast<ParenExpr>(this)->getSubExpr()
2216 ->isConstantInitializer(Ctx, IsForRef);
2217 case GenericSelectionExprClass:
2218 if (cast<GenericSelectionExpr>(this)->isResultDependent())
2220 return cast<GenericSelectionExpr>(this)->getResultExpr()
2221 ->isConstantInitializer(Ctx, IsForRef);
2222 case ChooseExprClass:
2223 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)
2224 ->isConstantInitializer(Ctx, IsForRef);
2225 case UnaryOperatorClass: {
2226 const UnaryOperator* Exp = cast<UnaryOperator>(this);
2227 if (Exp->getOpcode() == UO_Extension)
2228 return Exp->getSubExpr()->isConstantInitializer(Ctx, false);
2231 case BinaryOperatorClass: {
2232 // Special case &&foo - &&bar. It would be nice to generalize this somehow
2233 // but this handles the common case.
2234 const BinaryOperator *Exp = cast<BinaryOperator>(this);
2235 if (Exp->getOpcode() == BO_Sub &&
2236 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) &&
2237 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx)))
2241 case CXXFunctionalCastExprClass:
2242 case CXXStaticCastExprClass:
2243 case ImplicitCastExprClass:
2244 case CStyleCastExprClass:
2245 // Handle casts with a destination that's a struct or union; this
2246 // deals with both the gcc no-op struct cast extension and the
2247 // cast-to-union extension.
2248 if (getType()->isRecordType())
2249 return cast<CastExpr>(this)->getSubExpr()
2250 ->isConstantInitializer(Ctx, false);
2252 // Integer->integer casts can be handled here, which is important for
2253 // things like (int)(&&x-&&y). Scary but true.
2254 if (getType()->isIntegerType() &&
2255 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType())
2256 return cast<CastExpr>(this)->getSubExpr()
2257 ->isConstantInitializer(Ctx, false);
2261 return isEvaluatable(Ctx);
2264 /// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null
2265 /// pointer constant or not, as well as the specific kind of constant detected.
2266 /// Null pointer constants can be integer constant expressions with the
2267 /// value zero, casts of zero to void*, nullptr (C++0X), or __null
2268 /// (a GNU extension).
2269 Expr::NullPointerConstantKind
2270 Expr::isNullPointerConstant(ASTContext &Ctx,
2271 NullPointerConstantValueDependence NPC) const {
2272 if (isValueDependent()) {
2274 case NPC_NeverValueDependent:
2275 assert(false && "Unexpected value dependent expression!");
2276 // If the unthinkable happens, fall through to the safest alternative.
2278 case NPC_ValueDependentIsNull:
2279 if (isTypeDependent() || getType()->isIntegralType(Ctx))
2280 return NPCK_ZeroInteger;
2282 return NPCK_NotNull;
2284 case NPC_ValueDependentIsNotNull:
2285 return NPCK_NotNull;
2289 // Strip off a cast to void*, if it exists. Except in C++.
2290 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) {
2291 if (!Ctx.getLangOptions().CPlusPlus) {
2292 // Check that it is a cast to void*.
2293 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
2294 QualType Pointee = PT->getPointeeType();
2295 if (!Pointee.hasQualifiers() &&
2296 Pointee->isVoidType() && // to void*
2297 CE->getSubExpr()->getType()->isIntegerType()) // from int.
2298 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
2301 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) {
2302 // Ignore the ImplicitCastExpr type entirely.
2303 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
2304 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) {
2305 // Accept ((void*)0) as a null pointer constant, as many other
2306 // implementations do.
2307 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
2308 } else if (const GenericSelectionExpr *GE =
2309 dyn_cast<GenericSelectionExpr>(this)) {
2310 return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC);
2311 } else if (const CXXDefaultArgExpr *DefaultArg
2312 = dyn_cast<CXXDefaultArgExpr>(this)) {
2313 // See through default argument expressions
2314 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
2315 } else if (isa<GNUNullExpr>(this)) {
2316 // The GNU __null extension is always a null pointer constant.
2317 return NPCK_GNUNull;
2320 // C++0x nullptr_t is always a null pointer constant.
2321 if (getType()->isNullPtrType())
2322 return NPCK_CXX0X_nullptr;
2324 if (const RecordType *UT = getType()->getAsUnionType())
2325 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>())
2326 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){
2327 const Expr *InitExpr = CLE->getInitializer();
2328 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr))
2329 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC);
2331 // This expression must be an integer type.
2332 if (!getType()->isIntegerType() ||
2333 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType()))
2334 return NPCK_NotNull;
2336 // If we have an integer constant expression, we need to *evaluate* it and
2337 // test for the value 0.
2338 llvm::APSInt Result;
2339 bool IsNull = isIntegerConstantExpr(Result, Ctx) && Result == 0;
2341 return (IsNull ? NPCK_ZeroInteger : NPCK_NotNull);
2344 /// \brief If this expression is an l-value for an Objective C
2345 /// property, find the underlying property reference expression.
2346 const ObjCPropertyRefExpr *Expr::getObjCProperty() const {
2347 const Expr *E = this;
2349 assert((E->getValueKind() == VK_LValue &&
2350 E->getObjectKind() == OK_ObjCProperty) &&
2351 "expression is not a property reference");
2352 E = E->IgnoreParenCasts();
2353 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
2354 if (BO->getOpcode() == BO_Comma) {
2363 return cast<ObjCPropertyRefExpr>(E);
2366 FieldDecl *Expr::getBitField() {
2367 Expr *E = this->IgnoreParens();
2369 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2370 if (ICE->getCastKind() == CK_LValueToRValue ||
2371 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp))
2372 E = ICE->getSubExpr()->IgnoreParens();
2377 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E))
2378 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl()))
2379 if (Field->isBitField())
2382 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E))
2383 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl()))
2384 if (Field->isBitField())
2387 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E))
2388 if (BinOp->isAssignmentOp() && BinOp->getLHS())
2389 return BinOp->getLHS()->getBitField();
2394 bool Expr::refersToVectorElement() const {
2395 const Expr *E = this->IgnoreParens();
2397 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2398 if (ICE->getValueKind() != VK_RValue &&
2399 ICE->getCastKind() == CK_NoOp)
2400 E = ICE->getSubExpr()->IgnoreParens();
2405 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E))
2406 return ASE->getBase()->getType()->isVectorType();
2408 if (isa<ExtVectorElementExpr>(E))
2414 /// isArrow - Return true if the base expression is a pointer to vector,
2415 /// return false if the base expression is a vector.
2416 bool ExtVectorElementExpr::isArrow() const {
2417 return getBase()->getType()->isPointerType();
2420 unsigned ExtVectorElementExpr::getNumElements() const {
2421 if (const VectorType *VT = getType()->getAs<VectorType>())
2422 return VT->getNumElements();
2426 /// containsDuplicateElements - Return true if any element access is repeated.
2427 bool ExtVectorElementExpr::containsDuplicateElements() const {
2428 // FIXME: Refactor this code to an accessor on the AST node which returns the
2429 // "type" of component access, and share with code below and in Sema.
2430 llvm::StringRef Comp = Accessor->getName();
2432 // Halving swizzles do not contain duplicate elements.
2433 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
2436 // Advance past s-char prefix on hex swizzles.
2437 if (Comp[0] == 's' || Comp[0] == 'S')
2438 Comp = Comp.substr(1);
2440 for (unsigned i = 0, e = Comp.size(); i != e; ++i)
2441 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos)
2447 /// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
2448 void ExtVectorElementExpr::getEncodedElementAccess(
2449 llvm::SmallVectorImpl<unsigned> &Elts) const {
2450 llvm::StringRef Comp = Accessor->getName();
2451 if (Comp[0] == 's' || Comp[0] == 'S')
2452 Comp = Comp.substr(1);
2454 bool isHi = Comp == "hi";
2455 bool isLo = Comp == "lo";
2456 bool isEven = Comp == "even";
2457 bool isOdd = Comp == "odd";
2459 for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
2471 Index = ExtVectorType::getAccessorIdx(Comp[i]);
2473 Elts.push_back(Index);
2477 ObjCMessageExpr::ObjCMessageExpr(QualType T,
2479 SourceLocation LBracLoc,
2480 SourceLocation SuperLoc,
2481 bool IsInstanceSuper,
2484 SourceLocation SelLoc,
2485 ObjCMethodDecl *Method,
2486 Expr **Args, unsigned NumArgs,
2487 SourceLocation RBracLoc)
2488 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary,
2489 /*TypeDependent=*/false, /*ValueDependent=*/false,
2490 /*ContainsUnexpandedParameterPack=*/false),
2491 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass),
2492 HasMethod(Method != 0), SuperLoc(SuperLoc),
2493 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method
2494 : Sel.getAsOpaquePtr())),
2495 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc)
2497 setReceiverPointer(SuperType.getAsOpaquePtr());
2499 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *));
2502 ObjCMessageExpr::ObjCMessageExpr(QualType T,
2504 SourceLocation LBracLoc,
2505 TypeSourceInfo *Receiver,
2507 SourceLocation SelLoc,
2508 ObjCMethodDecl *Method,
2509 Expr **Args, unsigned NumArgs,
2510 SourceLocation RBracLoc)
2511 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(),
2512 T->isDependentType(), T->containsUnexpandedParameterPack()),
2513 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0),
2514 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method
2515 : Sel.getAsOpaquePtr())),
2516 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc)
2518 setReceiverPointer(Receiver);
2519 Expr **MyArgs = getArgs();
2520 for (unsigned I = 0; I != NumArgs; ++I) {
2521 if (Args[I]->isTypeDependent())
2522 ExprBits.TypeDependent = true;
2523 if (Args[I]->isValueDependent())
2524 ExprBits.ValueDependent = true;
2525 if (Args[I]->containsUnexpandedParameterPack())
2526 ExprBits.ContainsUnexpandedParameterPack = true;
2528 MyArgs[I] = Args[I];
2532 ObjCMessageExpr::ObjCMessageExpr(QualType T,
2534 SourceLocation LBracLoc,
2537 SourceLocation SelLoc,
2538 ObjCMethodDecl *Method,
2539 Expr **Args, unsigned NumArgs,
2540 SourceLocation RBracLoc)
2541 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(),
2542 Receiver->isTypeDependent(),
2543 Receiver->containsUnexpandedParameterPack()),
2544 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0),
2545 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method
2546 : Sel.getAsOpaquePtr())),
2547 SelectorLoc(SelLoc), LBracLoc(LBracLoc), RBracLoc(RBracLoc)
2549 setReceiverPointer(Receiver);
2550 Expr **MyArgs = getArgs();
2551 for (unsigned I = 0; I != NumArgs; ++I) {
2552 if (Args[I]->isTypeDependent())
2553 ExprBits.TypeDependent = true;
2554 if (Args[I]->isValueDependent())
2555 ExprBits.ValueDependent = true;
2556 if (Args[I]->containsUnexpandedParameterPack())
2557 ExprBits.ContainsUnexpandedParameterPack = true;
2559 MyArgs[I] = Args[I];
2563 ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T,
2565 SourceLocation LBracLoc,
2566 SourceLocation SuperLoc,
2567 bool IsInstanceSuper,
2570 SourceLocation SelLoc,
2571 ObjCMethodDecl *Method,
2572 Expr **Args, unsigned NumArgs,
2573 SourceLocation RBracLoc) {
2574 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) +
2575 NumArgs * sizeof(Expr *);
2576 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment);
2577 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper,
2578 SuperType, Sel, SelLoc, Method, Args,NumArgs,
2582 ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T,
2584 SourceLocation LBracLoc,
2585 TypeSourceInfo *Receiver,
2587 SourceLocation SelLoc,
2588 ObjCMethodDecl *Method,
2589 Expr **Args, unsigned NumArgs,
2590 SourceLocation RBracLoc) {
2591 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) +
2592 NumArgs * sizeof(Expr *);
2593 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment);
2594 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc,
2595 Method, Args, NumArgs, RBracLoc);
2598 ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T,
2600 SourceLocation LBracLoc,
2603 SourceLocation SelLoc,
2604 ObjCMethodDecl *Method,
2605 Expr **Args, unsigned NumArgs,
2606 SourceLocation RBracLoc) {
2607 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) +
2608 NumArgs * sizeof(Expr *);
2609 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment);
2610 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLoc,
2611 Method, Args, NumArgs, RBracLoc);
2614 ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context,
2616 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) +
2617 NumArgs * sizeof(Expr *);
2618 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment);
2619 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs);
2622 SourceRange ObjCMessageExpr::getReceiverRange() const {
2623 switch (getReceiverKind()) {
2625 return getInstanceReceiver()->getSourceRange();
2628 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange();
2632 return getSuperLoc();
2635 return SourceLocation();
2638 Selector ObjCMessageExpr::getSelector() const {
2640 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod)
2642 return Selector(SelectorOrMethod);
2645 ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const {
2646 switch (getReceiverKind()) {
2648 if (const ObjCObjectPointerType *Ptr
2649 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>())
2650 return Ptr->getInterfaceDecl();
2654 if (const ObjCObjectType *Ty
2655 = getClassReceiver()->getAs<ObjCObjectType>())
2656 return Ty->getInterface();
2660 if (const ObjCObjectPointerType *Ptr
2661 = getSuperType()->getAs<ObjCObjectPointerType>())
2662 return Ptr->getInterfaceDecl();
2666 if (const ObjCObjectType *Iface
2667 = getSuperType()->getAs<ObjCObjectType>())
2668 return Iface->getInterface();
2675 bool ChooseExpr::isConditionTrue(const ASTContext &C) const {
2676 return getCond()->EvaluateAsInt(C) != 0;
2679 ShuffleVectorExpr::ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr,
2680 QualType Type, SourceLocation BLoc,
2682 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary,
2683 Type->isDependentType(), Type->isDependentType(),
2684 Type->containsUnexpandedParameterPack()),
2685 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr)
2687 SubExprs = new (C) Stmt*[nexpr];
2688 for (unsigned i = 0; i < nexpr; i++) {
2689 if (args[i]->isTypeDependent())
2690 ExprBits.TypeDependent = true;
2691 if (args[i]->isValueDependent())
2692 ExprBits.ValueDependent = true;
2693 if (args[i]->containsUnexpandedParameterPack())
2694 ExprBits.ContainsUnexpandedParameterPack = true;
2696 SubExprs[i] = args[i];
2700 void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs,
2701 unsigned NumExprs) {
2702 if (SubExprs) C.Deallocate(SubExprs);
2704 SubExprs = new (C) Stmt* [NumExprs];
2705 this->NumExprs = NumExprs;
2706 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs);
2709 GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context,
2710 SourceLocation GenericLoc, Expr *ControllingExpr,
2711 TypeSourceInfo **AssocTypes, Expr **AssocExprs,
2712 unsigned NumAssocs, SourceLocation DefaultLoc,
2713 SourceLocation RParenLoc,
2714 bool ContainsUnexpandedParameterPack,
2715 unsigned ResultIndex)
2716 : Expr(GenericSelectionExprClass,
2717 AssocExprs[ResultIndex]->getType(),
2718 AssocExprs[ResultIndex]->getValueKind(),
2719 AssocExprs[ResultIndex]->getObjectKind(),
2720 AssocExprs[ResultIndex]->isTypeDependent(),
2721 AssocExprs[ResultIndex]->isValueDependent(),
2722 ContainsUnexpandedParameterPack),
2723 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]),
2724 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs),
2725 ResultIndex(ResultIndex), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc),
2726 RParenLoc(RParenLoc) {
2727 SubExprs[CONTROLLING] = ControllingExpr;
2728 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes);
2729 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR);
2732 GenericSelectionExpr::GenericSelectionExpr(ASTContext &Context,
2733 SourceLocation GenericLoc, Expr *ControllingExpr,
2734 TypeSourceInfo **AssocTypes, Expr **AssocExprs,
2735 unsigned NumAssocs, SourceLocation DefaultLoc,
2736 SourceLocation RParenLoc,
2737 bool ContainsUnexpandedParameterPack)
2738 : Expr(GenericSelectionExprClass,
2739 Context.DependentTy,
2742 /*isTypeDependent=*/ true,
2743 /*isValueDependent=*/ true,
2744 ContainsUnexpandedParameterPack),
2745 AssocTypes(new (Context) TypeSourceInfo*[NumAssocs]),
2746 SubExprs(new (Context) Stmt*[END_EXPR+NumAssocs]), NumAssocs(NumAssocs),
2747 ResultIndex(-1U), GenericLoc(GenericLoc), DefaultLoc(DefaultLoc),
2748 RParenLoc(RParenLoc) {
2749 SubExprs[CONTROLLING] = ControllingExpr;
2750 std::copy(AssocTypes, AssocTypes+NumAssocs, this->AssocTypes);
2751 std::copy(AssocExprs, AssocExprs+NumAssocs, SubExprs+END_EXPR);
2754 //===----------------------------------------------------------------------===//
2755 // DesignatedInitExpr
2756 //===----------------------------------------------------------------------===//
2758 IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() {
2759 assert(Kind == FieldDesignator && "Only valid on a field designator");
2760 if (Field.NameOrField & 0x01)
2761 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01);
2763 return getField()->getIdentifier();
2766 DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty,
2767 unsigned NumDesignators,
2768 const Designator *Designators,
2769 SourceLocation EqualOrColonLoc,
2772 unsigned NumIndexExprs,
2774 : Expr(DesignatedInitExprClass, Ty,
2775 Init->getValueKind(), Init->getObjectKind(),
2776 Init->isTypeDependent(), Init->isValueDependent(),
2777 Init->containsUnexpandedParameterPack()),
2778 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
2779 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) {
2780 this->Designators = new (C) Designator[NumDesignators];
2782 // Record the initializer itself.
2783 child_range Child = children();
2786 // Copy the designators and their subexpressions, computing
2787 // value-dependence along the way.
2788 unsigned IndexIdx = 0;
2789 for (unsigned I = 0; I != NumDesignators; ++I) {
2790 this->Designators[I] = Designators[I];
2792 if (this->Designators[I].isArrayDesignator()) {
2793 // Compute type- and value-dependence.
2794 Expr *Index = IndexExprs[IndexIdx];
2795 if (Index->isTypeDependent() || Index->isValueDependent())
2796 ExprBits.ValueDependent = true;
2798 // Propagate unexpanded parameter packs.
2799 if (Index->containsUnexpandedParameterPack())
2800 ExprBits.ContainsUnexpandedParameterPack = true;
2802 // Copy the index expressions into permanent storage.
2803 *Child++ = IndexExprs[IndexIdx++];
2804 } else if (this->Designators[I].isArrayRangeDesignator()) {
2805 // Compute type- and value-dependence.
2806 Expr *Start = IndexExprs[IndexIdx];
2807 Expr *End = IndexExprs[IndexIdx + 1];
2808 if (Start->isTypeDependent() || Start->isValueDependent() ||
2809 End->isTypeDependent() || End->isValueDependent())
2810 ExprBits.ValueDependent = true;
2812 // Propagate unexpanded parameter packs.
2813 if (Start->containsUnexpandedParameterPack() ||
2814 End->containsUnexpandedParameterPack())
2815 ExprBits.ContainsUnexpandedParameterPack = true;
2817 // Copy the start/end expressions into permanent storage.
2818 *Child++ = IndexExprs[IndexIdx++];
2819 *Child++ = IndexExprs[IndexIdx++];
2823 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions");
2826 DesignatedInitExpr *
2827 DesignatedInitExpr::Create(ASTContext &C, Designator *Designators,
2828 unsigned NumDesignators,
2829 Expr **IndexExprs, unsigned NumIndexExprs,
2830 SourceLocation ColonOrEqualLoc,
2831 bool UsesColonSyntax, Expr *Init) {
2832 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
2833 sizeof(Stmt *) * (NumIndexExprs + 1), 8);
2834 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators,
2835 ColonOrEqualLoc, UsesColonSyntax,
2836 IndexExprs, NumIndexExprs, Init);
2839 DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C,
2840 unsigned NumIndexExprs) {
2841 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
2842 sizeof(Stmt *) * (NumIndexExprs + 1), 8);
2843 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
2846 void DesignatedInitExpr::setDesignators(ASTContext &C,
2847 const Designator *Desigs,
2848 unsigned NumDesigs) {
2849 Designators = new (C) Designator[NumDesigs];
2850 NumDesignators = NumDesigs;
2851 for (unsigned I = 0; I != NumDesigs; ++I)
2852 Designators[I] = Desigs[I];
2855 SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const {
2856 DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this);
2858 return DIE->getDesignator(0)->getSourceRange();
2859 return SourceRange(DIE->getDesignator(0)->getStartLocation(),
2860 DIE->getDesignator(size()-1)->getEndLocation());
2863 SourceRange DesignatedInitExpr::getSourceRange() const {
2864 SourceLocation StartLoc;
2866 *const_cast<DesignatedInitExpr*>(this)->designators_begin();
2867 if (First.isFieldDesignator()) {
2869 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc);
2871 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc);
2874 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc);
2875 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd());
2878 Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) {
2879 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator");
2880 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2881 Ptr += sizeof(DesignatedInitExpr);
2882 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2883 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
2886 Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) {
2887 assert(D.Kind == Designator::ArrayRangeDesignator &&
2888 "Requires array range designator");
2889 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2890 Ptr += sizeof(DesignatedInitExpr);
2891 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2892 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
2895 Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) {
2896 assert(D.Kind == Designator::ArrayRangeDesignator &&
2897 "Requires array range designator");
2898 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2899 Ptr += sizeof(DesignatedInitExpr);
2900 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2901 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2));
2904 /// \brief Replaces the designator at index @p Idx with the series
2905 /// of designators in [First, Last).
2906 void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx,
2907 const Designator *First,
2908 const Designator *Last) {
2909 unsigned NumNewDesignators = Last - First;
2910 if (NumNewDesignators == 0) {
2911 std::copy_backward(Designators + Idx + 1,
2912 Designators + NumDesignators,
2914 --NumNewDesignators;
2916 } else if (NumNewDesignators == 1) {
2917 Designators[Idx] = *First;
2921 Designator *NewDesignators
2922 = new (C) Designator[NumDesignators - 1 + NumNewDesignators];
2923 std::copy(Designators, Designators + Idx, NewDesignators);
2924 std::copy(First, Last, NewDesignators + Idx);
2925 std::copy(Designators + Idx + 1, Designators + NumDesignators,
2926 NewDesignators + Idx + NumNewDesignators);
2927 Designators = NewDesignators;
2928 NumDesignators = NumDesignators - 1 + NumNewDesignators;
2931 ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc,
2932 Expr **exprs, unsigned nexprs,
2933 SourceLocation rparenloc)
2934 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary,
2935 false, false, false),
2936 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) {
2938 Exprs = new (C) Stmt*[nexprs];
2939 for (unsigned i = 0; i != nexprs; ++i) {
2940 if (exprs[i]->isTypeDependent())
2941 ExprBits.TypeDependent = true;
2942 if (exprs[i]->isValueDependent())
2943 ExprBits.ValueDependent = true;
2944 if (exprs[i]->containsUnexpandedParameterPack())
2945 ExprBits.ContainsUnexpandedParameterPack = true;
2947 Exprs[i] = exprs[i];
2951 const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) {
2952 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e))
2953 e = ewc->getSubExpr();
2954 e = cast<CXXConstructExpr>(e)->getArg(0);
2955 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
2956 e = ice->getSubExpr();
2957 return cast<OpaqueValueExpr>(e);
2960 //===----------------------------------------------------------------------===//
2962 //===----------------------------------------------------------------------===//
2964 Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); }
2965 Expr* ExprIterator::operator*() const { return cast<Expr>(*I); }
2966 Expr* ExprIterator::operator->() const { return cast<Expr>(*I); }
2967 const Expr* ConstExprIterator::operator[](size_t idx) const {
2968 return cast<Expr>(I[idx]);
2970 const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); }
2971 const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); }
2973 //===----------------------------------------------------------------------===//
2974 // Child Iterators for iterating over subexpressions/substatements
2975 //===----------------------------------------------------------------------===//
2977 // UnaryExprOrTypeTraitExpr
2978 Stmt::child_range UnaryExprOrTypeTraitExpr::children() {
2979 // If this is of a type and the type is a VLA type (and not a typedef), the
2980 // size expression of the VLA needs to be treated as an executable expression.
2981 // Why isn't this weirdness documented better in StmtIterator?
2982 if (isArgumentType()) {
2983 if (const VariableArrayType* T = dyn_cast<VariableArrayType>(
2984 getArgumentType().getTypePtr()))
2985 return child_range(child_iterator(T), child_iterator());
2986 return child_range();
2988 return child_range(&Argument.Ex, &Argument.Ex + 1);
2992 Stmt::child_range ObjCMessageExpr::children() {
2994 if (getReceiverKind() == Instance)
2995 begin = reinterpret_cast<Stmt **>(this + 1);
2997 begin = reinterpret_cast<Stmt **>(getArgs());
2998 return child_range(begin,
2999 reinterpret_cast<Stmt **>(getArgs() + getNumArgs()));
3003 BlockDeclRefExpr::BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK,
3004 SourceLocation l, bool ByRef,
3006 : Expr(BlockDeclRefExprClass, t, VK, OK_Ordinary, false, false,
3007 d->isParameterPack()),
3008 D(d), Loc(l), IsByRef(ByRef), ConstQualAdded(constAdded)
3010 bool TypeDependent = false;
3011 bool ValueDependent = false;
3012 computeDeclRefDependence(D, getType(), TypeDependent, ValueDependent);
3013 ExprBits.TypeDependent = TypeDependent;
3014 ExprBits.ValueDependent = ValueDependent;