1 //===--- Expr.cpp - Expression AST Node Implementation --------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Expr class and subclasses.
12 //===----------------------------------------------------------------------===//
14 #include "clang/AST/Expr.h"
15 #include "clang/AST/ExprCXX.h"
16 #include "clang/AST/APValue.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/DeclObjC.h"
19 #include "clang/AST/DeclCXX.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/RecordLayout.h"
22 #include "clang/AST/StmtVisitor.h"
23 #include "clang/Basic/Builtins.h"
24 #include "clang/Basic/TargetInfo.h"
25 #include "llvm/Support/raw_ostream.h"
27 using namespace clang;
29 //===----------------------------------------------------------------------===//
30 // Primary Expressions.
31 //===----------------------------------------------------------------------===//
33 // FIXME: Maybe this should use DeclPrinter with a special "print predefined
34 // expr" policy instead.
35 std::string PredefinedExpr::ComputeName(ASTContext &Context, IdentType IT,
36 const Decl *CurrentDecl) {
37 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
38 if (IT != PrettyFunction)
39 return FD->getNameAsString();
41 llvm::SmallString<256> Name;
42 llvm::raw_svector_ostream Out(Name);
44 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
49 PrintingPolicy Policy(Context.getLangOptions());
50 Policy.SuppressTagKind = true;
52 std::string Proto = FD->getQualifiedNameAsString(Policy);
54 const FunctionType *AFT = FD->getType()->getAs<FunctionType>();
55 const FunctionProtoType *FT = 0;
56 if (FD->hasWrittenPrototype())
57 FT = dyn_cast<FunctionProtoType>(AFT);
61 llvm::raw_string_ostream POut(Proto);
62 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
65 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy);
69 if (FT->isVariadic()) {
70 if (FD->getNumParams()) POut << ", ";
76 AFT->getResultType().getAsStringInternal(Proto, Policy);
81 return Name.str().str();
83 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) {
84 llvm::SmallString<256> Name;
85 llvm::raw_svector_ostream Out(Name);
86 Out << (MD->isInstanceMethod() ? '-' : '+');
88 Out << MD->getClassInterface()->getNameAsString();
89 if (const ObjCCategoryImplDecl *CID =
90 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) {
92 Out << CID->getNameAsString();
96 Out << MD->getSelector().getAsString();
100 return Name.str().str();
102 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) {
103 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
109 /// getValueAsApproximateDouble - This returns the value as an inaccurate
110 /// double. Note that this may cause loss of precision, but is useful for
111 /// debugging dumps, etc.
112 double FloatingLiteral::getValueAsApproximateDouble() const {
113 llvm::APFloat V = getValue();
115 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
117 return V.convertToDouble();
120 StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData,
121 unsigned ByteLength, bool Wide,
123 const SourceLocation *Loc,
125 // Allocate enough space for the StringLiteral plus an array of locations for
126 // any concatenated string tokens.
127 void *Mem = C.Allocate(sizeof(StringLiteral)+
128 sizeof(SourceLocation)*(NumStrs-1),
129 llvm::alignof<StringLiteral>());
130 StringLiteral *SL = new (Mem) StringLiteral(Ty);
132 // OPTIMIZE: could allocate this appended to the StringLiteral.
133 char *AStrData = new (C, 1) char[ByteLength];
134 memcpy(AStrData, StrData, ByteLength);
135 SL->StrData = AStrData;
136 SL->ByteLength = ByteLength;
138 SL->TokLocs[0] = Loc[0];
139 SL->NumConcatenated = NumStrs;
142 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1));
146 StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) {
147 void *Mem = C.Allocate(sizeof(StringLiteral)+
148 sizeof(SourceLocation)*(NumStrs-1),
149 llvm::alignof<StringLiteral>());
150 StringLiteral *SL = new (Mem) StringLiteral(QualType());
153 SL->NumConcatenated = NumStrs;
157 void StringLiteral::DoDestroy(ASTContext &C) {
158 C.Deallocate(const_cast<char*>(StrData));
162 void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) {
164 C.Deallocate(const_cast<char*>(StrData));
166 char *AStrData = new (C, 1) char[Str.size()];
167 memcpy(AStrData, Str.data(), Str.size());
169 ByteLength = Str.size();
172 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
173 /// corresponds to, e.g. "sizeof" or "[pre]++".
174 const char *UnaryOperator::getOpcodeStr(Opcode Op) {
176 default: assert(0 && "Unknown unary operator");
177 case PostInc: return "++";
178 case PostDec: return "--";
179 case PreInc: return "++";
180 case PreDec: return "--";
181 case AddrOf: return "&";
182 case Deref: return "*";
183 case Plus: return "+";
184 case Minus: return "-";
185 case Not: return "~";
186 case LNot: return "!";
187 case Real: return "__real";
188 case Imag: return "__imag";
189 case Extension: return "__extension__";
190 case OffsetOf: return "__builtin_offsetof";
194 UnaryOperator::Opcode
195 UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
197 default: assert(false && "No unary operator for overloaded function");
198 case OO_PlusPlus: return Postfix ? PostInc : PreInc;
199 case OO_MinusMinus: return Postfix ? PostDec : PreDec;
200 case OO_Amp: return AddrOf;
201 case OO_Star: return Deref;
202 case OO_Plus: return Plus;
203 case OO_Minus: return Minus;
204 case OO_Tilde: return Not;
205 case OO_Exclaim: return LNot;
209 OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
211 case PostInc: case PreInc: return OO_PlusPlus;
212 case PostDec: case PreDec: return OO_MinusMinus;
213 case AddrOf: return OO_Amp;
214 case Deref: return OO_Star;
215 case Plus: return OO_Plus;
216 case Minus: return OO_Minus;
217 case Not: return OO_Tilde;
218 case LNot: return OO_Exclaim;
219 default: return OO_None;
224 //===----------------------------------------------------------------------===//
225 // Postfix Operators.
226 //===----------------------------------------------------------------------===//
228 CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args,
229 unsigned numargs, QualType t, SourceLocation rparenloc)
231 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs),
232 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)),
235 SubExprs = new (C) Stmt*[numargs+1];
237 for (unsigned i = 0; i != numargs; ++i)
238 SubExprs[i+ARGS_START] = args[i];
240 RParenLoc = rparenloc;
243 CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs,
244 QualType t, SourceLocation rparenloc)
245 : Expr(CallExprClass, t,
246 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs),
247 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)),
250 SubExprs = new (C) Stmt*[numargs+1];
252 for (unsigned i = 0; i != numargs; ++i)
253 SubExprs[i+ARGS_START] = args[i];
255 RParenLoc = rparenloc;
258 CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty)
259 : Expr(SC, Empty), SubExprs(0), NumArgs(0) {
260 SubExprs = new (C) Stmt*[1];
263 void CallExpr::DoDestroy(ASTContext& C) {
265 if (SubExprs) C.Deallocate(SubExprs);
270 FunctionDecl *CallExpr::getDirectCallee() {
271 Expr *CEE = getCallee()->IgnoreParenCasts();
272 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE))
273 return dyn_cast<FunctionDecl>(DRE->getDecl());
278 /// setNumArgs - This changes the number of arguments present in this call.
279 /// Any orphaned expressions are deleted by this, and any new operands are set
281 void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) {
282 // No change, just return.
283 if (NumArgs == getNumArgs()) return;
285 // If shrinking # arguments, just delete the extras and forgot them.
286 if (NumArgs < getNumArgs()) {
287 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i)
288 getArg(i)->Destroy(C);
289 this->NumArgs = NumArgs;
293 // Otherwise, we are growing the # arguments. New an bigger argument array.
294 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1];
296 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i)
297 NewSubExprs[i] = SubExprs[i];
298 // Null out new args.
299 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i)
302 if (SubExprs) C.Deallocate(SubExprs);
303 SubExprs = NewSubExprs;
304 this->NumArgs = NumArgs;
307 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If
309 unsigned CallExpr::isBuiltinCall(ASTContext &Context) const {
310 // All simple function calls (e.g. func()) are implicitly cast to pointer to
311 // function. As a result, we try and obtain the DeclRefExpr from the
313 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
314 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
317 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
321 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
325 if (!FDecl->getIdentifier())
328 return FDecl->getBuiltinID();
331 QualType CallExpr::getCallReturnType() const {
332 QualType CalleeType = getCallee()->getType();
333 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>())
334 CalleeType = FnTypePtr->getPointeeType();
335 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>())
336 CalleeType = BPT->getPointeeType();
338 const FunctionType *FnType = CalleeType->getAs<FunctionType>();
339 return FnType->getResultType();
342 MemberExpr::MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual,
343 SourceRange qualrange, NamedDecl *memberdecl,
344 SourceLocation l, bool has_explicit,
345 SourceLocation langle,
346 const TemplateArgument *targs, unsigned numtargs,
347 SourceLocation rangle, QualType ty)
348 : Expr(MemberExprClass, ty,
349 base->isTypeDependent() || (qual && qual->isDependent()),
350 base->isValueDependent() || (qual && qual->isDependent())),
351 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow),
352 HasQualifier(qual != 0), HasExplicitTemplateArgumentList(has_explicit) {
353 // Initialize the qualifier, if any.
355 NameQualifier *NQ = getMemberQualifier();
357 NQ->Range = qualrange;
360 // Initialize the explicit template argument list, if any.
361 if (HasExplicitTemplateArgumentList) {
362 ExplicitTemplateArgumentList *ETemplateArgs
363 = getExplicitTemplateArgumentList();
364 ETemplateArgs->LAngleLoc = langle;
365 ETemplateArgs->RAngleLoc = rangle;
366 ETemplateArgs->NumTemplateArgs = numtargs;
368 TemplateArgument *TemplateArgs = ETemplateArgs->getTemplateArgs();
369 for (unsigned I = 0; I < numtargs; ++I)
370 new (TemplateArgs + I) TemplateArgument(targs[I]);
374 MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow,
375 NestedNameSpecifier *qual,
376 SourceRange qualrange,
377 NamedDecl *memberdecl,
380 SourceLocation langle,
381 const TemplateArgument *targs,
383 SourceLocation rangle,
385 std::size_t Size = sizeof(MemberExpr);
387 Size += sizeof(NameQualifier);
390 Size += sizeof(ExplicitTemplateArgumentList) +
391 sizeof(TemplateArgument) * numtargs;
393 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>());
394 return new (Mem) MemberExpr(base, isarrow, qual, qualrange, memberdecl, l,
395 has_explicit, langle, targs, numtargs, rangle,
399 const char *CastExpr::getCastKindName() const {
400 switch (getCastKind()) {
401 case CastExpr::CK_Unknown:
403 case CastExpr::CK_BitCast:
405 case CastExpr::CK_NoOp:
407 case CastExpr::CK_DerivedToBase:
408 return "DerivedToBase";
409 case CastExpr::CK_Dynamic:
411 case CastExpr::CK_ToUnion:
413 case CastExpr::CK_ArrayToPointerDecay:
414 return "ArrayToPointerDecay";
415 case CastExpr::CK_FunctionToPointerDecay:
416 return "FunctionToPointerDecay";
417 case CastExpr::CK_NullToMemberPointer:
418 return "NullToMemberPointer";
419 case CastExpr::CK_BaseToDerivedMemberPointer:
420 return "BaseToDerivedMemberPointer";
421 case CastExpr::CK_UserDefinedConversion:
422 return "UserDefinedConversion";
423 case CastExpr::CK_ConstructorConversion:
424 return "ConstructorConversion";
425 case CastExpr::CK_IntegralToPointer:
426 return "IntegralToPointer";
427 case CastExpr::CK_PointerToIntegral:
428 return "PointerToIntegral";
429 case CastExpr::CK_ToVoid:
431 case CastExpr::CK_VectorSplat:
432 return "VectorSplat";
433 case CastExpr::CK_IntegralCast:
434 return "IntegralCast";
435 case CastExpr::CK_IntegralToFloating:
436 return "IntegralToFloating";
437 case CastExpr::CK_FloatingToIntegral:
438 return "FloatingToIntegral";
439 case CastExpr::CK_FloatingCast:
440 return "FloatingCast";
443 assert(0 && "Unhandled cast kind!");
447 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
448 /// corresponds to, e.g. "<<=".
449 const char *BinaryOperator::getOpcodeStr(Opcode Op) {
451 case PtrMemD: return ".*";
452 case PtrMemI: return "->*";
453 case Mul: return "*";
454 case Div: return "/";
455 case Rem: return "%";
456 case Add: return "+";
457 case Sub: return "-";
458 case Shl: return "<<";
459 case Shr: return ">>";
462 case LE: return "<=";
463 case GE: return ">=";
464 case EQ: return "==";
465 case NE: return "!=";
466 case And: return "&";
467 case Xor: return "^";
469 case LAnd: return "&&";
470 case LOr: return "||";
471 case Assign: return "=";
472 case MulAssign: return "*=";
473 case DivAssign: return "/=";
474 case RemAssign: return "%=";
475 case AddAssign: return "+=";
476 case SubAssign: return "-=";
477 case ShlAssign: return "<<=";
478 case ShrAssign: return ">>=";
479 case AndAssign: return "&=";
480 case XorAssign: return "^=";
481 case OrAssign: return "|=";
482 case Comma: return ",";
488 BinaryOperator::Opcode
489 BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
491 default: assert(false && "Not an overloadable binary operator");
492 case OO_Plus: return Add;
493 case OO_Minus: return Sub;
494 case OO_Star: return Mul;
495 case OO_Slash: return Div;
496 case OO_Percent: return Rem;
497 case OO_Caret: return Xor;
498 case OO_Amp: return And;
499 case OO_Pipe: return Or;
500 case OO_Equal: return Assign;
501 case OO_Less: return LT;
502 case OO_Greater: return GT;
503 case OO_PlusEqual: return AddAssign;
504 case OO_MinusEqual: return SubAssign;
505 case OO_StarEqual: return MulAssign;
506 case OO_SlashEqual: return DivAssign;
507 case OO_PercentEqual: return RemAssign;
508 case OO_CaretEqual: return XorAssign;
509 case OO_AmpEqual: return AndAssign;
510 case OO_PipeEqual: return OrAssign;
511 case OO_LessLess: return Shl;
512 case OO_GreaterGreater: return Shr;
513 case OO_LessLessEqual: return ShlAssign;
514 case OO_GreaterGreaterEqual: return ShrAssign;
515 case OO_EqualEqual: return EQ;
516 case OO_ExclaimEqual: return NE;
517 case OO_LessEqual: return LE;
518 case OO_GreaterEqual: return GE;
519 case OO_AmpAmp: return LAnd;
520 case OO_PipePipe: return LOr;
521 case OO_Comma: return Comma;
522 case OO_ArrowStar: return PtrMemI;
526 OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
527 static const OverloadedOperatorKind OverOps[] = {
528 /* .* Cannot be overloaded */OO_None, OO_ArrowStar,
529 OO_Star, OO_Slash, OO_Percent,
531 OO_LessLess, OO_GreaterGreater,
532 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
533 OO_EqualEqual, OO_ExclaimEqual,
539 OO_Equal, OO_StarEqual,
540 OO_SlashEqual, OO_PercentEqual,
541 OO_PlusEqual, OO_MinusEqual,
542 OO_LessLessEqual, OO_GreaterGreaterEqual,
543 OO_AmpEqual, OO_CaretEqual,
550 InitListExpr::InitListExpr(SourceLocation lbraceloc,
551 Expr **initExprs, unsigned numInits,
552 SourceLocation rbraceloc)
553 : Expr(InitListExprClass, QualType(),
554 hasAnyTypeDependentArguments(initExprs, numInits),
555 hasAnyValueDependentArguments(initExprs, numInits)),
556 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0),
557 UnionFieldInit(0), HadArrayRangeDesignator(false) {
559 InitExprs.insert(InitExprs.end(), initExprs, initExprs+numInits);
562 void InitListExpr::reserveInits(unsigned NumInits) {
563 if (NumInits > InitExprs.size())
564 InitExprs.reserve(NumInits);
567 void InitListExpr::resizeInits(ASTContext &Context, unsigned NumInits) {
568 for (unsigned Idx = NumInits, LastIdx = InitExprs.size();
569 Idx < LastIdx; ++Idx)
570 InitExprs[Idx]->Destroy(Context);
571 InitExprs.resize(NumInits, 0);
574 Expr *InitListExpr::updateInit(unsigned Init, Expr *expr) {
575 if (Init >= InitExprs.size()) {
576 InitExprs.insert(InitExprs.end(), Init - InitExprs.size() + 1, 0);
577 InitExprs.back() = expr;
581 Expr *Result = cast_or_null<Expr>(InitExprs[Init]);
582 InitExprs[Init] = expr;
586 /// getFunctionType - Return the underlying function type for this block.
588 const FunctionType *BlockExpr::getFunctionType() const {
589 return getType()->getAs<BlockPointerType>()->
590 getPointeeType()->getAs<FunctionType>();
593 SourceLocation BlockExpr::getCaretLocation() const {
594 return TheBlock->getCaretLocation();
596 const Stmt *BlockExpr::getBody() const {
597 return TheBlock->getBody();
599 Stmt *BlockExpr::getBody() {
600 return TheBlock->getBody();
604 //===----------------------------------------------------------------------===//
605 // Generic Expression Routines
606 //===----------------------------------------------------------------------===//
608 /// isUnusedResultAWarning - Return true if this immediate expression should
609 /// be warned about if the result is unused. If so, fill in Loc and Ranges
610 /// with location to warn on and the source range[s] to report with the
612 bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
613 SourceRange &R2) const {
614 // Don't warn if the expr is type dependent. The type could end up
615 // instantiating to void.
616 if (isTypeDependent())
619 switch (getStmtClass()) {
622 R1 = getSourceRange();
625 return cast<ParenExpr>(this)->getSubExpr()->
626 isUnusedResultAWarning(Loc, R1, R2);
627 case UnaryOperatorClass: {
628 const UnaryOperator *UO = cast<UnaryOperator>(this);
630 switch (UO->getOpcode()) {
632 case UnaryOperator::PostInc:
633 case UnaryOperator::PostDec:
634 case UnaryOperator::PreInc:
635 case UnaryOperator::PreDec: // ++/--
636 return false; // Not a warning.
637 case UnaryOperator::Deref:
638 // Dereferencing a volatile pointer is a side-effect.
639 if (getType().isVolatileQualified())
642 case UnaryOperator::Real:
643 case UnaryOperator::Imag:
644 // accessing a piece of a volatile complex is a side-effect.
645 if (UO->getSubExpr()->getType().isVolatileQualified())
648 case UnaryOperator::Extension:
649 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
651 Loc = UO->getOperatorLoc();
652 R1 = UO->getSubExpr()->getSourceRange();
655 case BinaryOperatorClass: {
656 const BinaryOperator *BO = cast<BinaryOperator>(this);
657 // Consider comma to have side effects if the LHS or RHS does.
658 if (BO->getOpcode() == BinaryOperator::Comma)
659 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2) ||
660 BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2);
662 if (BO->isAssignmentOp())
664 Loc = BO->getOperatorLoc();
665 R1 = BO->getLHS()->getSourceRange();
666 R2 = BO->getRHS()->getSourceRange();
669 case CompoundAssignOperatorClass:
672 case ConditionalOperatorClass: {
673 // The condition must be evaluated, but if either the LHS or RHS is a
674 // warning, warn about them.
675 const ConditionalOperator *Exp = cast<ConditionalOperator>(this);
677 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2))
679 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2);
682 case MemberExprClass:
683 // If the base pointer or element is to a volatile pointer/field, accessing
684 // it is a side effect.
685 if (getType().isVolatileQualified())
687 Loc = cast<MemberExpr>(this)->getMemberLoc();
688 R1 = SourceRange(Loc, Loc);
689 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange();
692 case ArraySubscriptExprClass:
693 // If the base pointer or element is to a volatile pointer/field, accessing
694 // it is a side effect.
695 if (getType().isVolatileQualified())
697 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
698 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
699 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
703 case CXXOperatorCallExprClass:
704 case CXXMemberCallExprClass: {
705 // If this is a direct call, get the callee.
706 const CallExpr *CE = cast<CallExpr>(this);
707 if (const FunctionDecl *FD = CE->getDirectCallee()) {
708 // If the callee has attribute pure, const, or warn_unused_result, warn
709 // about it. void foo() { strlen("bar"); } should warn.
711 // Note: If new cases are added here, DiagnoseUnusedExprResult should be
712 // updated to match for QoI.
713 if (FD->getAttr<WarnUnusedResultAttr>() ||
714 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) {
715 Loc = CE->getCallee()->getLocStart();
716 R1 = CE->getCallee()->getSourceRange();
718 if (unsigned NumArgs = CE->getNumArgs())
719 R2 = SourceRange(CE->getArg(0)->getLocStart(),
720 CE->getArg(NumArgs-1)->getLocEnd());
726 case ObjCMessageExprClass:
729 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send.
731 const ObjCImplicitSetterGetterRefExpr *Ref =
732 cast<ObjCImplicitSetterGetterRefExpr>(this);
733 // FIXME: We really want the location of the '.' here.
734 Loc = Ref->getLocation();
735 R1 = SourceRange(Ref->getLocation(), Ref->getLocation());
737 R2 = Ref->getBase()->getSourceRange();
740 R1 = getSourceRange();
744 case StmtExprClass: {
745 // Statement exprs don't logically have side effects themselves, but are
746 // sometimes used in macros in ways that give them a type that is unused.
747 // For example ({ blah; foo(); }) will end up with a type if foo has a type.
748 // however, if the result of the stmt expr is dead, we don't want to emit a
750 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt();
751 if (!CS->body_empty())
752 if (const Expr *E = dyn_cast<Expr>(CS->body_back()))
753 return E->isUnusedResultAWarning(Loc, R1, R2);
755 Loc = cast<StmtExpr>(this)->getLParenLoc();
756 R1 = getSourceRange();
759 case CStyleCastExprClass:
760 // If this is an explicit cast to void, allow it. People do this when they
761 // think they know what they're doing :).
762 if (getType()->isVoidType())
764 Loc = cast<CStyleCastExpr>(this)->getLParenLoc();
765 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange();
767 case CXXFunctionalCastExprClass:
768 // If this is a cast to void, check the operand. Otherwise, the result of
769 // the cast is unused.
770 if (getType()->isVoidType())
771 return cast<CastExpr>(this)->getSubExpr()
772 ->isUnusedResultAWarning(Loc, R1, R2);
773 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc();
774 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange();
777 case ImplicitCastExprClass:
778 // Check the operand, since implicit casts are inserted by Sema
779 return cast<ImplicitCastExpr>(this)
780 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
782 case CXXDefaultArgExprClass:
783 return cast<CXXDefaultArgExpr>(this)
784 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2);
786 case CXXNewExprClass:
787 // FIXME: In theory, there might be new expressions that don't have side
788 // effects (e.g. a placement new with an uninitialized POD).
789 case CXXDeleteExprClass:
791 case CXXBindTemporaryExprClass:
792 return cast<CXXBindTemporaryExpr>(this)
793 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
794 case CXXExprWithTemporariesClass:
795 return cast<CXXExprWithTemporaries>(this)
796 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
800 /// DeclCanBeLvalue - Determine whether the given declaration can be
801 /// an lvalue. This is a helper routine for isLvalue.
802 static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) {
803 // C++ [temp.param]p6:
804 // A non-type non-reference template-parameter is not an lvalue.
805 if (const NonTypeTemplateParmDecl *NTTParm
806 = dyn_cast<NonTypeTemplateParmDecl>(Decl))
807 return NTTParm->getType()->isReferenceType();
809 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) ||
810 // C++ 3.10p2: An lvalue refers to an object or function.
811 (Ctx.getLangOptions().CPlusPlus &&
812 (isa<FunctionDecl>(Decl) || isa<OverloadedFunctionDecl>(Decl) ||
813 isa<FunctionTemplateDecl>(Decl)));
816 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an
817 /// incomplete type other than void. Nonarray expressions that can be lvalues:
818 /// - name, where name must be a variable
820 /// - (e), where e must be an lvalue
821 /// - e.name, where e must be an lvalue
823 /// - *e, the type of e cannot be a function type
824 /// - string-constant
825 /// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension]
826 /// - reference type [C++ [expr]]
828 Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const {
829 assert(!TR->isReferenceType() && "Expressions can't have reference type.");
831 isLvalueResult Res = isLvalueInternal(Ctx);
832 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus)
835 // first, check the type (C99 6.3.2.1). Expressions with function
836 // type in C are not lvalues, but they can be lvalues in C++.
837 if (TR->isFunctionType() || TR == Ctx.OverloadTy)
838 return LV_NotObjectType;
840 // Allow qualified void which is an incomplete type other than void (yuck).
841 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers())
842 return LV_IncompleteVoidType;
847 // Check whether the expression can be sanely treated like an l-value
848 Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const {
849 switch (getStmtClass()) {
850 case StringLiteralClass: // C99 6.5.1p4
851 case ObjCEncodeExprClass: // @encode behaves like its string in every way.
853 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2))))
854 // For vectors, make sure base is an lvalue (i.e. not a function call).
855 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType())
856 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx);
858 case DeclRefExprClass:
859 case QualifiedDeclRefExprClass: { // C99 6.5.1p2
860 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl();
861 if (DeclCanBeLvalue(RefdDecl, Ctx))
865 case BlockDeclRefExprClass: {
866 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this);
867 if (isa<VarDecl>(BDR->getDecl()))
871 case MemberExprClass: {
872 const MemberExpr *m = cast<MemberExpr>(this);
873 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4:
874 NamedDecl *Member = m->getMemberDecl();
876 // If E2 is declared to have type "reference to T", then E1.E2
878 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member))
879 if (Value->getType()->isReferenceType())
882 // -- If E2 is a static data member [...] then E1.E2 is an lvalue.
883 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord())
886 // -- If E2 is a non-static data member [...]. If E1 is an
887 // lvalue, then E1.E2 is an lvalue.
888 if (isa<FieldDecl>(Member))
889 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx);
891 // -- If it refers to a static member function [...], then
892 // E1.E2 is an lvalue.
893 // -- Otherwise, if E1.E2 refers to a non-static member
894 // function [...], then E1.E2 is not an lvalue.
895 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member))
896 return Method->isStatic()? LV_Valid : LV_MemberFunction;
898 // -- If E2 is a member enumerator [...], the expression E1.E2
900 if (isa<EnumConstantDecl>(Member))
901 return LV_InvalidExpression;
904 return LV_InvalidExpression;
908 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(Ctx);
910 case UnaryOperatorClass:
911 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref)
912 return LV_Valid; // C99 6.5.3p4
914 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real ||
915 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag ||
916 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension)
917 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU.
919 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1
920 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc ||
921 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec))
924 case ImplicitCastExprClass:
925 return cast<ImplicitCastExpr>(this)->isLvalueCast()? LV_Valid
926 : LV_InvalidExpression;
927 case ParenExprClass: // C99 6.5.1p5
928 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx);
929 case BinaryOperatorClass:
930 case CompoundAssignOperatorClass: {
931 const BinaryOperator *BinOp = cast<BinaryOperator>(this);
933 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1
934 BinOp->getOpcode() == BinaryOperator::Comma)
935 return BinOp->getRHS()->isLvalue(Ctx);
937 // C++ [expr.mptr.oper]p6
938 // The result of a .* expression is an lvalue only if its first operand is
939 // an lvalue and its second operand is a pointer to data member.
940 if (BinOp->getOpcode() == BinaryOperator::PtrMemD &&
941 !BinOp->getType()->isFunctionType())
942 return BinOp->getLHS()->isLvalue(Ctx);
944 // The result of an ->* expression is an lvalue only if its second operand
945 // is a pointer to data member.
946 if (BinOp->getOpcode() == BinaryOperator::PtrMemI &&
947 !BinOp->getType()->isFunctionType()) {
948 QualType Ty = BinOp->getRHS()->getType();
949 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType())
953 if (!BinOp->isAssignmentOp())
954 return LV_InvalidExpression;
956 if (Ctx.getLangOptions().CPlusPlus)
958 // The result of an assignment operation [...] is an lvalue.
963 // An assignment expression [...] is not an lvalue.
964 return LV_InvalidExpression;
967 case CXXOperatorCallExprClass:
968 case CXXMemberCallExprClass: {
969 // C++0x [expr.call]p10
970 // A function call is an lvalue if and only if the result type
971 // is an lvalue reference.
972 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType();
973 if (ReturnType->isLValueReferenceType())
978 case CompoundLiteralExprClass: // C99 6.5.2.5p5
980 case ChooseExprClass:
981 // __builtin_choose_expr is an lvalue if the selected operand is.
982 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx);
983 case ExtVectorElementExprClass:
984 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements())
985 return LV_DuplicateVectorComponents;
987 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues.
989 case ObjCPropertyRefExprClass: // FIXME: check if read-only property.
991 case ObjCImplicitSetterGetterRefExprClass: // FIXME: check if read-only property.
993 case PredefinedExprClass:
995 case CXXDefaultArgExprClass:
996 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx);
997 case CXXConditionDeclExprClass:
999 case CStyleCastExprClass:
1000 case CXXFunctionalCastExprClass:
1001 case CXXStaticCastExprClass:
1002 case CXXDynamicCastExprClass:
1003 case CXXReinterpretCastExprClass:
1004 case CXXConstCastExprClass:
1005 // The result of an explicit cast is an lvalue if the type we are
1006 // casting to is an lvalue reference type. See C++ [expr.cast]p1,
1007 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2,
1008 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1.
1009 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()->
1010 isLValueReferenceType())
1013 case CXXTypeidExprClass:
1014 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ...
1016 case CXXBindTemporaryExprClass:
1017 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()->
1018 isLvalueInternal(Ctx);
1019 case ConditionalOperatorClass: {
1020 // Complicated handling is only for C++.
1021 if (!Ctx.getLangOptions().CPlusPlus)
1022 return LV_InvalidExpression;
1024 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is
1025 // everywhere there's an object converted to an rvalue. Also, any other
1026 // casts should be wrapped by ImplicitCastExprs. There's just the special
1027 // case involving throws to work out.
1028 const ConditionalOperator *Cond = cast<ConditionalOperator>(this);
1029 Expr *True = Cond->getTrueExpr();
1030 Expr *False = Cond->getFalseExpr();
1032 // If either the second or the third operand has type (cv) void, [...]
1033 // the result [...] is an rvalue.
1034 if (True->getType()->isVoidType() || False->getType()->isVoidType())
1035 return LV_InvalidExpression;
1037 // Both sides must be lvalues for the result to be an lvalue.
1038 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid)
1039 return LV_InvalidExpression;
1048 return LV_InvalidExpression;
1051 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
1052 /// does not have an incomplete type, does not have a const-qualified type, and
1053 /// if it is a structure or union, does not have any member (including,
1054 /// recursively, any member or element of all contained aggregates or unions)
1055 /// with a const-qualified type.
1056 Expr::isModifiableLvalueResult
1057 Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const {
1058 isLvalueResult lvalResult = isLvalue(Ctx);
1060 switch (lvalResult) {
1062 // C++ 3.10p11: Functions cannot be modified, but pointers to
1063 // functions can be modifiable.
1064 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType())
1065 return MLV_NotObjectType;
1068 case LV_NotObjectType: return MLV_NotObjectType;
1069 case LV_IncompleteVoidType: return MLV_IncompleteVoidType;
1070 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents;
1071 case LV_InvalidExpression:
1072 // If the top level is a C-style cast, and the subexpression is a valid
1073 // lvalue, then this is probably a use of the old-school "cast as lvalue"
1074 // GCC extension. We don't support it, but we want to produce good
1075 // diagnostics when it happens so that the user knows why.
1076 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) {
1077 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) {
1079 *Loc = CE->getLParenLoc();
1080 return MLV_LValueCast;
1083 return MLV_InvalidExpression;
1084 case LV_MemberFunction: return MLV_MemberFunction;
1087 // The following is illegal:
1088 // void takeclosure(void (^C)(void));
1089 // void func() { int x = 1; takeclosure(^{ x = 7; }); }
1091 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) {
1092 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl()))
1093 return MLV_NotBlockQualified;
1096 // Assigning to an 'implicit' property?
1097 if (const ObjCImplicitSetterGetterRefExpr* Expr =
1098 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) {
1099 if (Expr->getSetterMethod() == 0)
1100 return MLV_NoSetterProperty;
1103 QualType CT = Ctx.getCanonicalType(getType());
1105 if (CT.isConstQualified())
1106 return MLV_ConstQualified;
1107 if (CT->isArrayType())
1108 return MLV_ArrayType;
1109 if (CT->isIncompleteType())
1110 return MLV_IncompleteType;
1112 if (const RecordType *r = CT->getAs<RecordType>()) {
1113 if (r->hasConstFields())
1114 return MLV_ConstQualified;
1120 /// isOBJCGCCandidate - Check if an expression is objc gc'able.
1121 /// returns true, if it is; false otherwise.
1122 bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
1123 switch (getStmtClass()) {
1126 case ObjCIvarRefExprClass:
1128 case Expr::UnaryOperatorClass:
1129 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1130 case ParenExprClass:
1131 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1132 case ImplicitCastExprClass:
1133 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1134 case CStyleCastExprClass:
1135 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx);
1136 case DeclRefExprClass:
1137 case QualifiedDeclRefExprClass: {
1138 const Decl *D = cast<DeclRefExpr>(this)->getDecl();
1139 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1140 if (VD->hasGlobalStorage())
1142 QualType T = VD->getType();
1143 // dereferencing to a pointer is always a gc'able candidate,
1144 // unless it is __weak.
1145 return T->isPointerType() &&
1146 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak);
1150 case MemberExprClass: {
1151 const MemberExpr *M = cast<MemberExpr>(this);
1152 return M->getBase()->isOBJCGCCandidate(Ctx);
1154 case ArraySubscriptExprClass:
1155 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx);
1158 Expr* Expr::IgnoreParens() {
1160 while (ParenExpr* P = dyn_cast<ParenExpr>(E))
1161 E = P->getSubExpr();
1166 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr
1167 /// or CastExprs or ImplicitCastExprs, returning their operand.
1168 Expr *Expr::IgnoreParenCasts() {
1171 if (ParenExpr *P = dyn_cast<ParenExpr>(E))
1172 E = P->getSubExpr();
1173 else if (CastExpr *P = dyn_cast<CastExpr>(E))
1174 E = P->getSubExpr();
1180 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the
1181 /// value (including ptr->int casts of the same size). Strip off any
1182 /// ParenExpr or CastExprs, returning their operand.
1183 Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) {
1186 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) {
1187 E = P->getSubExpr();
1191 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
1192 // We ignore integer <-> casts that are of the same width, ptr<->ptr and
1193 // ptr<->int casts of the same width. We also ignore all identify casts.
1194 Expr *SE = P->getSubExpr();
1196 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) {
1201 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) &&
1202 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) &&
1203 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) {
1214 /// hasAnyTypeDependentArguments - Determines if any of the expressions
1215 /// in Exprs is type-dependent.
1216 bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) {
1217 for (unsigned I = 0; I < NumExprs; ++I)
1218 if (Exprs[I]->isTypeDependent())
1224 /// hasAnyValueDependentArguments - Determines if any of the expressions
1225 /// in Exprs is value-dependent.
1226 bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) {
1227 for (unsigned I = 0; I < NumExprs; ++I)
1228 if (Exprs[I]->isValueDependent())
1234 bool Expr::isConstantInitializer(ASTContext &Ctx) const {
1235 // This function is attempting whether an expression is an initializer
1236 // which can be evaluated at compile-time. isEvaluatable handles most
1237 // of the cases, but it can't deal with some initializer-specific
1238 // expressions, and it can't deal with aggregates; we deal with those here,
1239 // and fall back to isEvaluatable for the other cases.
1241 // FIXME: This function assumes the variable being assigned to
1242 // isn't a reference type!
1244 switch (getStmtClass()) {
1246 case StringLiteralClass:
1247 case ObjCStringLiteralClass:
1248 case ObjCEncodeExprClass:
1250 case CompoundLiteralExprClass: {
1251 // This handles gcc's extension that allows global initializers like
1252 // "struct x {int x;} x = (struct x) {};".
1253 // FIXME: This accepts other cases it shouldn't!
1254 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer();
1255 return Exp->isConstantInitializer(Ctx);
1257 case InitListExprClass: {
1258 // FIXME: This doesn't deal with fields with reference types correctly.
1259 // FIXME: This incorrectly allows pointers cast to integers to be assigned
1261 const InitListExpr *Exp = cast<InitListExpr>(this);
1262 unsigned numInits = Exp->getNumInits();
1263 for (unsigned i = 0; i < numInits; i++) {
1264 if (!Exp->getInit(i)->isConstantInitializer(Ctx))
1269 case ImplicitValueInitExprClass:
1271 case ParenExprClass:
1272 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
1273 case UnaryOperatorClass: {
1274 const UnaryOperator* Exp = cast<UnaryOperator>(this);
1275 if (Exp->getOpcode() == UnaryOperator::Extension)
1276 return Exp->getSubExpr()->isConstantInitializer(Ctx);
1279 case BinaryOperatorClass: {
1280 // Special case &&foo - &&bar. It would be nice to generalize this somehow
1281 // but this handles the common case.
1282 const BinaryOperator *Exp = cast<BinaryOperator>(this);
1283 if (Exp->getOpcode() == BinaryOperator::Sub &&
1284 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) &&
1285 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx)))
1289 case ImplicitCastExprClass:
1290 case CStyleCastExprClass:
1291 // Handle casts with a destination that's a struct or union; this
1292 // deals with both the gcc no-op struct cast extension and the
1293 // cast-to-union extension.
1294 if (getType()->isRecordType())
1295 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
1297 // Integer->integer casts can be handled here, which is important for
1298 // things like (int)(&&x-&&y). Scary but true.
1299 if (getType()->isIntegerType() &&
1300 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType())
1301 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
1305 return isEvaluatable(Ctx);
1308 /// isIntegerConstantExpr - this recursive routine will test if an expression is
1309 /// an integer constant expression.
1311 /// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero,
1314 /// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof
1315 /// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer
1316 /// cast+dereference.
1318 // CheckICE - This function does the fundamental ICE checking: the returned
1319 // ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation.
1320 // Note that to reduce code duplication, this helper does no evaluation
1321 // itself; the caller checks whether the expression is evaluatable, and
1322 // in the rare cases where CheckICE actually cares about the evaluated
1323 // value, it calls into Evalute.
1326 // 0: This expression is an ICE if it can be evaluated by Evaluate.
1327 // 1: This expression is not an ICE, but if it isn't evaluated, it's
1328 // a legal subexpression for an ICE. This return value is used to handle
1329 // the comma operator in C99 mode.
1330 // 2: This expression is not an ICE, and is not a legal subexpression for one.
1337 ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {}
1338 ICEDiag() : Val(0) {}
1341 ICEDiag NoDiag() { return ICEDiag(); }
1343 static ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) {
1344 Expr::EvalResult EVResult;
1345 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects ||
1346 !EVResult.Val.isInt()) {
1347 return ICEDiag(2, E->getLocStart());
1352 static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) {
1353 assert(!E->isValueDependent() && "Should not see value dependent exprs!");
1354 if (!E->getType()->isIntegralType()) {
1355 return ICEDiag(2, E->getLocStart());
1358 switch (E->getStmtClass()) {
1359 #define STMT(Node, Base) case Expr::Node##Class:
1360 #define EXPR(Node, Base)
1361 #include "clang/AST/StmtNodes.def"
1362 case Expr::PredefinedExprClass:
1363 case Expr::FloatingLiteralClass:
1364 case Expr::ImaginaryLiteralClass:
1365 case Expr::StringLiteralClass:
1366 case Expr::ArraySubscriptExprClass:
1367 case Expr::MemberExprClass:
1368 case Expr::CompoundAssignOperatorClass:
1369 case Expr::CompoundLiteralExprClass:
1370 case Expr::ExtVectorElementExprClass:
1371 case Expr::InitListExprClass:
1372 case Expr::DesignatedInitExprClass:
1373 case Expr::ImplicitValueInitExprClass:
1374 case Expr::ParenListExprClass:
1375 case Expr::VAArgExprClass:
1376 case Expr::AddrLabelExprClass:
1377 case Expr::StmtExprClass:
1378 case Expr::CXXMemberCallExprClass:
1379 case Expr::CXXDynamicCastExprClass:
1380 case Expr::CXXTypeidExprClass:
1381 case Expr::CXXNullPtrLiteralExprClass:
1382 case Expr::CXXThisExprClass:
1383 case Expr::CXXThrowExprClass:
1384 case Expr::CXXConditionDeclExprClass: // FIXME: is this correct?
1385 case Expr::CXXNewExprClass:
1386 case Expr::CXXDeleteExprClass:
1387 case Expr::CXXPseudoDestructorExprClass:
1388 case Expr::UnresolvedFunctionNameExprClass:
1389 case Expr::UnresolvedDeclRefExprClass:
1390 case Expr::TemplateIdRefExprClass:
1391 case Expr::CXXConstructExprClass:
1392 case Expr::CXXBindTemporaryExprClass:
1393 case Expr::CXXExprWithTemporariesClass:
1394 case Expr::CXXTemporaryObjectExprClass:
1395 case Expr::CXXUnresolvedConstructExprClass:
1396 case Expr::CXXUnresolvedMemberExprClass:
1397 case Expr::ObjCStringLiteralClass:
1398 case Expr::ObjCEncodeExprClass:
1399 case Expr::ObjCMessageExprClass:
1400 case Expr::ObjCSelectorExprClass:
1401 case Expr::ObjCProtocolExprClass:
1402 case Expr::ObjCIvarRefExprClass:
1403 case Expr::ObjCPropertyRefExprClass:
1404 case Expr::ObjCImplicitSetterGetterRefExprClass:
1405 case Expr::ObjCSuperExprClass:
1406 case Expr::ObjCIsaExprClass:
1407 case Expr::ShuffleVectorExprClass:
1408 case Expr::BlockExprClass:
1409 case Expr::BlockDeclRefExprClass:
1410 case Expr::NoStmtClass:
1411 case Expr::ExprClass:
1412 return ICEDiag(2, E->getLocStart());
1414 case Expr::GNUNullExprClass:
1415 // GCC considers the GNU __null value to be an integral constant expression.
1418 case Expr::ParenExprClass:
1419 return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx);
1420 case Expr::IntegerLiteralClass:
1421 case Expr::CharacterLiteralClass:
1422 case Expr::CXXBoolLiteralExprClass:
1423 case Expr::CXXZeroInitValueExprClass:
1424 case Expr::TypesCompatibleExprClass:
1425 case Expr::UnaryTypeTraitExprClass:
1427 case Expr::CallExprClass:
1428 case Expr::CXXOperatorCallExprClass: {
1429 const CallExpr *CE = cast<CallExpr>(E);
1430 if (CE->isBuiltinCall(Ctx))
1431 return CheckEvalInICE(E, Ctx);
1432 return ICEDiag(2, E->getLocStart());
1434 case Expr::DeclRefExprClass:
1435 case Expr::QualifiedDeclRefExprClass:
1436 if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl()))
1438 if (Ctx.getLangOptions().CPlusPlus &&
1439 E->getType().getCVRQualifiers() == Qualifiers::Const) {
1441 // A variable of non-volatile const-qualified integral or enumeration
1442 // type initialized by an ICE can be used in ICEs.
1443 if (const VarDecl *Dcl =
1444 dyn_cast<VarDecl>(cast<DeclRefExpr>(E)->getDecl())) {
1445 if (Dcl->isInitKnownICE()) {
1446 // We have already checked whether this subexpression is an
1447 // integral constant expression.
1448 if (Dcl->isInitICE())
1451 return ICEDiag(2, E->getLocStart());
1454 if (const Expr *Init = Dcl->getInit()) {
1455 ICEDiag Result = CheckICE(Init, Ctx);
1456 // Cache the result of the ICE test.
1457 Dcl->setInitKnownICE(Ctx, Result.Val == 0);
1462 return ICEDiag(2, E->getLocStart());
1463 case Expr::UnaryOperatorClass: {
1464 const UnaryOperator *Exp = cast<UnaryOperator>(E);
1465 switch (Exp->getOpcode()) {
1466 case UnaryOperator::PostInc:
1467 case UnaryOperator::PostDec:
1468 case UnaryOperator::PreInc:
1469 case UnaryOperator::PreDec:
1470 case UnaryOperator::AddrOf:
1471 case UnaryOperator::Deref:
1472 return ICEDiag(2, E->getLocStart());
1474 case UnaryOperator::Extension:
1475 case UnaryOperator::LNot:
1476 case UnaryOperator::Plus:
1477 case UnaryOperator::Minus:
1478 case UnaryOperator::Not:
1479 case UnaryOperator::Real:
1480 case UnaryOperator::Imag:
1481 return CheckICE(Exp->getSubExpr(), Ctx);
1482 case UnaryOperator::OffsetOf:
1483 // Note that per C99, offsetof must be an ICE. And AFAIK, using
1484 // Evaluate matches the proposed gcc behavior for cases like
1485 // "offsetof(struct s{int x[4];}, x[!.0])". This doesn't affect
1486 // compliance: we should warn earlier for offsetof expressions with
1487 // array subscripts that aren't ICEs, and if the array subscripts
1488 // are ICEs, the value of the offsetof must be an integer constant.
1489 return CheckEvalInICE(E, Ctx);
1492 case Expr::SizeOfAlignOfExprClass: {
1493 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(E);
1494 if (Exp->isSizeOf() && Exp->getTypeOfArgument()->isVariableArrayType())
1495 return ICEDiag(2, E->getLocStart());
1498 case Expr::BinaryOperatorClass: {
1499 const BinaryOperator *Exp = cast<BinaryOperator>(E);
1500 switch (Exp->getOpcode()) {
1501 case BinaryOperator::PtrMemD:
1502 case BinaryOperator::PtrMemI:
1503 case BinaryOperator::Assign:
1504 case BinaryOperator::MulAssign:
1505 case BinaryOperator::DivAssign:
1506 case BinaryOperator::RemAssign:
1507 case BinaryOperator::AddAssign:
1508 case BinaryOperator::SubAssign:
1509 case BinaryOperator::ShlAssign:
1510 case BinaryOperator::ShrAssign:
1511 case BinaryOperator::AndAssign:
1512 case BinaryOperator::XorAssign:
1513 case BinaryOperator::OrAssign:
1514 return ICEDiag(2, E->getLocStart());
1516 case BinaryOperator::Mul:
1517 case BinaryOperator::Div:
1518 case BinaryOperator::Rem:
1519 case BinaryOperator::Add:
1520 case BinaryOperator::Sub:
1521 case BinaryOperator::Shl:
1522 case BinaryOperator::Shr:
1523 case BinaryOperator::LT:
1524 case BinaryOperator::GT:
1525 case BinaryOperator::LE:
1526 case BinaryOperator::GE:
1527 case BinaryOperator::EQ:
1528 case BinaryOperator::NE:
1529 case BinaryOperator::And:
1530 case BinaryOperator::Xor:
1531 case BinaryOperator::Or:
1532 case BinaryOperator::Comma: {
1533 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
1534 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
1535 if (Exp->getOpcode() == BinaryOperator::Div ||
1536 Exp->getOpcode() == BinaryOperator::Rem) {
1537 // Evaluate gives an error for undefined Div/Rem, so make sure
1538 // we don't evaluate one.
1539 if (LHSResult.Val != 2 && RHSResult.Val != 2) {
1540 llvm::APSInt REval = Exp->getRHS()->EvaluateAsInt(Ctx);
1542 return ICEDiag(1, E->getLocStart());
1543 if (REval.isSigned() && REval.isAllOnesValue()) {
1544 llvm::APSInt LEval = Exp->getLHS()->EvaluateAsInt(Ctx);
1545 if (LEval.isMinSignedValue())
1546 return ICEDiag(1, E->getLocStart());
1550 if (Exp->getOpcode() == BinaryOperator::Comma) {
1551 if (Ctx.getLangOptions().C99) {
1552 // C99 6.6p3 introduces a strange edge case: comma can be in an ICE
1553 // if it isn't evaluated.
1554 if (LHSResult.Val == 0 && RHSResult.Val == 0)
1555 return ICEDiag(1, E->getLocStart());
1557 // In both C89 and C++, commas in ICEs are illegal.
1558 return ICEDiag(2, E->getLocStart());
1561 if (LHSResult.Val >= RHSResult.Val)
1565 case BinaryOperator::LAnd:
1566 case BinaryOperator::LOr: {
1567 ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx);
1568 ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx);
1569 if (LHSResult.Val == 0 && RHSResult.Val == 1) {
1570 // Rare case where the RHS has a comma "side-effect"; we need
1571 // to actually check the condition to see whether the side
1572 // with the comma is evaluated.
1573 if ((Exp->getOpcode() == BinaryOperator::LAnd) !=
1574 (Exp->getLHS()->EvaluateAsInt(Ctx) == 0))
1579 if (LHSResult.Val >= RHSResult.Val)
1585 case Expr::CastExprClass:
1586 case Expr::ImplicitCastExprClass:
1587 case Expr::ExplicitCastExprClass:
1588 case Expr::CStyleCastExprClass:
1589 case Expr::CXXFunctionalCastExprClass:
1590 case Expr::CXXNamedCastExprClass:
1591 case Expr::CXXStaticCastExprClass:
1592 case Expr::CXXReinterpretCastExprClass:
1593 case Expr::CXXConstCastExprClass: {
1594 const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr();
1595 if (SubExpr->getType()->isIntegralType())
1596 return CheckICE(SubExpr, Ctx);
1597 if (isa<FloatingLiteral>(SubExpr->IgnoreParens()))
1599 return ICEDiag(2, E->getLocStart());
1601 case Expr::ConditionalOperatorClass: {
1602 const ConditionalOperator *Exp = cast<ConditionalOperator>(E);
1603 // If the condition (ignoring parens) is a __builtin_constant_p call,
1604 // then only the true side is actually considered in an integer constant
1605 // expression, and it is fully evaluated. This is an important GNU
1606 // extension. See GCC PR38377 for discussion.
1607 if (const CallExpr *CallCE = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts()))
1608 if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) {
1609 Expr::EvalResult EVResult;
1610 if (!E->Evaluate(EVResult, Ctx) || EVResult.HasSideEffects ||
1611 !EVResult.Val.isInt()) {
1612 return ICEDiag(2, E->getLocStart());
1616 ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx);
1617 ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx);
1618 ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx);
1619 if (CondResult.Val == 2)
1621 if (TrueResult.Val == 2)
1623 if (FalseResult.Val == 2)
1625 if (CondResult.Val == 1)
1627 if (TrueResult.Val == 0 && FalseResult.Val == 0)
1629 // Rare case where the diagnostics depend on which side is evaluated
1630 // Note that if we get here, CondResult is 0, and at least one of
1631 // TrueResult and FalseResult is non-zero.
1632 if (Exp->getCond()->EvaluateAsInt(Ctx) == 0) {
1637 case Expr::CXXDefaultArgExprClass:
1638 return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx);
1639 case Expr::ChooseExprClass: {
1640 return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx);
1644 // Silence a GCC warning
1645 return ICEDiag(2, E->getLocStart());
1648 bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx,
1649 SourceLocation *Loc, bool isEvaluated) const {
1650 ICEDiag d = CheckICE(this, Ctx);
1652 if (Loc) *Loc = d.Loc;
1655 EvalResult EvalResult;
1656 if (!Evaluate(EvalResult, Ctx))
1657 assert(0 && "ICE cannot be evaluated!");
1658 assert(!EvalResult.HasSideEffects && "ICE with side effects!");
1659 assert(EvalResult.Val.isInt() && "ICE that isn't integer!");
1660 Result = EvalResult.Val.getInt();
1664 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an
1665 /// integer constant expression with the value zero, or if this is one that is
1667 bool Expr::isNullPointerConstant(ASTContext &Ctx,
1668 NullPointerConstantValueDependence NPC) const {
1669 if (isValueDependent()) {
1671 case NPC_NeverValueDependent:
1672 assert(false && "Unexpected value dependent expression!");
1673 // If the unthinkable happens, fall through to the safest alternative.
1675 case NPC_ValueDependentIsNull:
1676 return isTypeDependent() || getType()->isIntegralType();
1678 case NPC_ValueDependentIsNotNull:
1683 // Strip off a cast to void*, if it exists. Except in C++.
1684 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) {
1685 if (!Ctx.getLangOptions().CPlusPlus) {
1686 // Check that it is a cast to void*.
1687 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
1688 QualType Pointee = PT->getPointeeType();
1689 if (!Pointee.hasQualifiers() &&
1690 Pointee->isVoidType() && // to void*
1691 CE->getSubExpr()->getType()->isIntegerType()) // from int.
1692 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
1695 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) {
1696 // Ignore the ImplicitCastExpr type entirely.
1697 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
1698 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) {
1699 // Accept ((void*)0) as a null pointer constant, as many other
1700 // implementations do.
1701 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
1702 } else if (const CXXDefaultArgExpr *DefaultArg
1703 = dyn_cast<CXXDefaultArgExpr>(this)) {
1704 // See through default argument expressions
1705 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
1706 } else if (isa<GNUNullExpr>(this)) {
1707 // The GNU __null extension is always a null pointer constant.
1711 // C++0x nullptr_t is always a null pointer constant.
1712 if (getType()->isNullPtrType())
1715 // This expression must be an integer type.
1716 if (!getType()->isIntegerType() ||
1717 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType()))
1720 // If we have an integer constant expression, we need to *evaluate* it and
1721 // test for the value 0.
1722 llvm::APSInt Result;
1723 return isIntegerConstantExpr(Result, Ctx) && Result == 0;
1726 FieldDecl *Expr::getBitField() {
1727 Expr *E = this->IgnoreParens();
1729 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E))
1730 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl()))
1731 if (Field->isBitField())
1734 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E))
1735 if (BinOp->isAssignmentOp() && BinOp->getLHS())
1736 return BinOp->getLHS()->getBitField();
1741 /// isArrow - Return true if the base expression is a pointer to vector,
1742 /// return false if the base expression is a vector.
1743 bool ExtVectorElementExpr::isArrow() const {
1744 return getBase()->getType()->isPointerType();
1747 unsigned ExtVectorElementExpr::getNumElements() const {
1748 if (const VectorType *VT = getType()->getAs<VectorType>())
1749 return VT->getNumElements();
1753 /// containsDuplicateElements - Return true if any element access is repeated.
1754 bool ExtVectorElementExpr::containsDuplicateElements() const {
1755 // FIXME: Refactor this code to an accessor on the AST node which returns the
1756 // "type" of component access, and share with code below and in Sema.
1757 llvm::StringRef Comp = Accessor->getName();
1759 // Halving swizzles do not contain duplicate elements.
1760 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
1763 // Advance past s-char prefix on hex swizzles.
1764 if (Comp[0] == 's' || Comp[0] == 'S')
1765 Comp = Comp.substr(1);
1767 for (unsigned i = 0, e = Comp.size(); i != e; ++i)
1768 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos)
1774 /// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
1775 void ExtVectorElementExpr::getEncodedElementAccess(
1776 llvm::SmallVectorImpl<unsigned> &Elts) const {
1777 llvm::StringRef Comp = Accessor->getName();
1778 if (Comp[0] == 's' || Comp[0] == 'S')
1779 Comp = Comp.substr(1);
1781 bool isHi = Comp == "hi";
1782 bool isLo = Comp == "lo";
1783 bool isEven = Comp == "even";
1784 bool isOdd = Comp == "odd";
1786 for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
1798 Index = ExtVectorType::getAccessorIdx(Comp[i]);
1800 Elts.push_back(Index);
1804 // constructor for instance messages.
1805 ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo,
1806 QualType retType, ObjCMethodDecl *mproto,
1807 SourceLocation LBrac, SourceLocation RBrac,
1808 Expr **ArgExprs, unsigned nargs)
1809 : Expr(ObjCMessageExprClass, retType), SelName(selInfo),
1810 MethodProto(mproto) {
1812 SubExprs = new Stmt*[NumArgs+1];
1813 SubExprs[RECEIVER] = receiver;
1815 for (unsigned i = 0; i != NumArgs; ++i)
1816 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
1822 // constructor for class messages.
1823 // FIXME: clsName should be typed to ObjCInterfaceType
1824 ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo,
1825 QualType retType, ObjCMethodDecl *mproto,
1826 SourceLocation LBrac, SourceLocation RBrac,
1827 Expr **ArgExprs, unsigned nargs)
1828 : Expr(ObjCMessageExprClass, retType), SelName(selInfo),
1829 MethodProto(mproto) {
1831 SubExprs = new Stmt*[NumArgs+1];
1832 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | IsClsMethDeclUnknown);
1834 for (unsigned i = 0; i != NumArgs; ++i)
1835 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
1841 // constructor for class messages.
1842 ObjCMessageExpr::ObjCMessageExpr(ObjCInterfaceDecl *cls, Selector selInfo,
1843 QualType retType, ObjCMethodDecl *mproto,
1844 SourceLocation LBrac, SourceLocation RBrac,
1845 Expr **ArgExprs, unsigned nargs)
1846 : Expr(ObjCMessageExprClass, retType), SelName(selInfo),
1847 MethodProto(mproto) {
1849 SubExprs = new Stmt*[NumArgs+1];
1850 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) cls | IsClsMethDeclKnown);
1852 for (unsigned i = 0; i != NumArgs; ++i)
1853 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]);
1859 ObjCMessageExpr::ClassInfo ObjCMessageExpr::getClassInfo() const {
1860 uintptr_t x = (uintptr_t) SubExprs[RECEIVER];
1861 switch (x & Flags) {
1863 assert(false && "Invalid ObjCMessageExpr.");
1865 return ClassInfo(0, 0);
1866 case IsClsMethDeclUnknown:
1867 return ClassInfo(0, (IdentifierInfo*) (x & ~Flags));
1868 case IsClsMethDeclKnown: {
1869 ObjCInterfaceDecl* D = (ObjCInterfaceDecl*) (x & ~Flags);
1870 return ClassInfo(D, D->getIdentifier());
1875 void ObjCMessageExpr::setClassInfo(const ObjCMessageExpr::ClassInfo &CI) {
1876 if (CI.first == 0 && CI.second == 0)
1877 SubExprs[RECEIVER] = (Expr*)((uintptr_t)0 | IsInstMeth);
1878 else if (CI.first == 0)
1879 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.second | IsClsMethDeclUnknown);
1881 SubExprs[RECEIVER] = (Expr*)((uintptr_t)CI.first | IsClsMethDeclKnown);
1885 bool ChooseExpr::isConditionTrue(ASTContext &C) const {
1886 return getCond()->EvaluateAsInt(C) != 0;
1889 void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs,
1890 unsigned NumExprs) {
1891 if (SubExprs) C.Deallocate(SubExprs);
1893 SubExprs = new (C) Stmt* [NumExprs];
1894 this->NumExprs = NumExprs;
1895 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs);
1898 void ShuffleVectorExpr::DoDestroy(ASTContext& C) {
1900 if (SubExprs) C.Deallocate(SubExprs);
1901 this->~ShuffleVectorExpr();
1905 void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) {
1906 // Override default behavior of traversing children. If this has a type
1907 // operand and the type is a variable-length array, the child iteration
1908 // will iterate over the size expression. However, this expression belongs
1909 // to the type, not to this, so we don't want to delete it.
1910 // We still want to delete this expression.
1911 if (isArgumentType()) {
1912 this->~SizeOfAlignOfExpr();
1919 //===----------------------------------------------------------------------===//
1920 // DesignatedInitExpr
1921 //===----------------------------------------------------------------------===//
1923 IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() {
1924 assert(Kind == FieldDesignator && "Only valid on a field designator");
1925 if (Field.NameOrField & 0x01)
1926 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01);
1928 return getField()->getIdentifier();
1931 DesignatedInitExpr::DesignatedInitExpr(QualType Ty, unsigned NumDesignators,
1932 const Designator *Designators,
1933 SourceLocation EqualOrColonLoc,
1936 unsigned NumIndexExprs,
1938 : Expr(DesignatedInitExprClass, Ty,
1939 Init->isTypeDependent(), Init->isValueDependent()),
1940 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
1941 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) {
1942 this->Designators = new Designator[NumDesignators];
1944 // Record the initializer itself.
1945 child_iterator Child = child_begin();
1948 // Copy the designators and their subexpressions, computing
1949 // value-dependence along the way.
1950 unsigned IndexIdx = 0;
1951 for (unsigned I = 0; I != NumDesignators; ++I) {
1952 this->Designators[I] = Designators[I];
1954 if (this->Designators[I].isArrayDesignator()) {
1955 // Compute type- and value-dependence.
1956 Expr *Index = IndexExprs[IndexIdx];
1957 ValueDependent = ValueDependent ||
1958 Index->isTypeDependent() || Index->isValueDependent();
1960 // Copy the index expressions into permanent storage.
1961 *Child++ = IndexExprs[IndexIdx++];
1962 } else if (this->Designators[I].isArrayRangeDesignator()) {
1963 // Compute type- and value-dependence.
1964 Expr *Start = IndexExprs[IndexIdx];
1965 Expr *End = IndexExprs[IndexIdx + 1];
1966 ValueDependent = ValueDependent ||
1967 Start->isTypeDependent() || Start->isValueDependent() ||
1968 End->isTypeDependent() || End->isValueDependent();
1970 // Copy the start/end expressions into permanent storage.
1971 *Child++ = IndexExprs[IndexIdx++];
1972 *Child++ = IndexExprs[IndexIdx++];
1976 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions");
1979 DesignatedInitExpr *
1980 DesignatedInitExpr::Create(ASTContext &C, Designator *Designators,
1981 unsigned NumDesignators,
1982 Expr **IndexExprs, unsigned NumIndexExprs,
1983 SourceLocation ColonOrEqualLoc,
1984 bool UsesColonSyntax, Expr *Init) {
1985 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
1986 sizeof(Stmt *) * (NumIndexExprs + 1), 8);
1987 return new (Mem) DesignatedInitExpr(C.VoidTy, NumDesignators, Designators,
1988 ColonOrEqualLoc, UsesColonSyntax,
1989 IndexExprs, NumIndexExprs, Init);
1992 DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C,
1993 unsigned NumIndexExprs) {
1994 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) +
1995 sizeof(Stmt *) * (NumIndexExprs + 1), 8);
1996 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
1999 void DesignatedInitExpr::setDesignators(const Designator *Desigs,
2000 unsigned NumDesigs) {
2002 delete [] Designators;
2004 Designators = new Designator[NumDesigs];
2005 NumDesignators = NumDesigs;
2006 for (unsigned I = 0; I != NumDesigs; ++I)
2007 Designators[I] = Desigs[I];
2010 SourceRange DesignatedInitExpr::getSourceRange() const {
2011 SourceLocation StartLoc;
2013 *const_cast<DesignatedInitExpr*>(this)->designators_begin();
2014 if (First.isFieldDesignator()) {
2016 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc);
2018 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc);
2021 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc);
2022 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd());
2025 Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) {
2026 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator");
2027 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2028 Ptr += sizeof(DesignatedInitExpr);
2029 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2030 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
2033 Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) {
2034 assert(D.Kind == Designator::ArrayRangeDesignator &&
2035 "Requires array range designator");
2036 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2037 Ptr += sizeof(DesignatedInitExpr);
2038 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2039 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1));
2042 Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) {
2043 assert(D.Kind == Designator::ArrayRangeDesignator &&
2044 "Requires array range designator");
2045 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2046 Ptr += sizeof(DesignatedInitExpr);
2047 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2048 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2));
2051 /// \brief Replaces the designator at index @p Idx with the series
2052 /// of designators in [First, Last).
2053 void DesignatedInitExpr::ExpandDesignator(unsigned Idx,
2054 const Designator *First,
2055 const Designator *Last) {
2056 unsigned NumNewDesignators = Last - First;
2057 if (NumNewDesignators == 0) {
2058 std::copy_backward(Designators + Idx + 1,
2059 Designators + NumDesignators,
2061 --NumNewDesignators;
2063 } else if (NumNewDesignators == 1) {
2064 Designators[Idx] = *First;
2068 Designator *NewDesignators
2069 = new Designator[NumDesignators - 1 + NumNewDesignators];
2070 std::copy(Designators, Designators + Idx, NewDesignators);
2071 std::copy(First, Last, NewDesignators + Idx);
2072 std::copy(Designators + Idx + 1, Designators + NumDesignators,
2073 NewDesignators + Idx + NumNewDesignators);
2074 delete [] Designators;
2075 Designators = NewDesignators;
2076 NumDesignators = NumDesignators - 1 + NumNewDesignators;
2079 void DesignatedInitExpr::DoDestroy(ASTContext &C) {
2080 delete [] Designators;
2084 ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc,
2085 Expr **exprs, unsigned nexprs,
2086 SourceLocation rparenloc)
2087 : Expr(ParenListExprClass, QualType(),
2088 hasAnyTypeDependentArguments(exprs, nexprs),
2089 hasAnyValueDependentArguments(exprs, nexprs)),
2090 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) {
2092 Exprs = new (C) Stmt*[nexprs];
2093 for (unsigned i = 0; i != nexprs; ++i)
2094 Exprs[i] = exprs[i];
2097 void ParenListExpr::DoDestroy(ASTContext& C) {
2099 if (Exprs) C.Deallocate(Exprs);
2100 this->~ParenListExpr();
2104 //===----------------------------------------------------------------------===//
2106 //===----------------------------------------------------------------------===//
2108 Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); }
2109 Expr* ExprIterator::operator*() const { return cast<Expr>(*I); }
2110 Expr* ExprIterator::operator->() const { return cast<Expr>(*I); }
2111 const Expr* ConstExprIterator::operator[](size_t idx) const {
2112 return cast<Expr>(I[idx]);
2114 const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); }
2115 const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); }
2117 //===----------------------------------------------------------------------===//
2118 // Child Iterators for iterating over subexpressions/substatements
2119 //===----------------------------------------------------------------------===//
2122 Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); }
2123 Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); }
2126 Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; }
2127 Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; }
2129 // ObjCPropertyRefExpr
2130 Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; }
2131 Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; }
2133 // ObjCImplicitSetterGetterRefExpr
2134 Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() {
2137 Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() {
2142 Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); }
2143 Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); }
2146 Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; }
2147 Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; }
2150 Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); }
2151 Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); }
2154 Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); }
2155 Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); }
2158 Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();}
2159 Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); }
2162 Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); }
2163 Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); }
2166 Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; }
2167 Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; }
2170 Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); }
2171 Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); }
2174 Stmt::child_iterator ParenExpr::child_begin() { return &Val; }
2175 Stmt::child_iterator ParenExpr::child_end() { return &Val+1; }
2178 Stmt::child_iterator UnaryOperator::child_begin() { return &Val; }
2179 Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; }
2181 // SizeOfAlignOfExpr
2182 Stmt::child_iterator SizeOfAlignOfExpr::child_begin() {
2183 // If this is of a type and the type is a VLA type (and not a typedef), the
2184 // size expression of the VLA needs to be treated as an executable expression.
2185 // Why isn't this weirdness documented better in StmtIterator?
2186 if (isArgumentType()) {
2187 if (VariableArrayType* T = dyn_cast<VariableArrayType>(
2188 getArgumentType().getTypePtr()))
2189 return child_iterator(T);
2190 return child_iterator();
2192 return child_iterator(&Argument.Ex);
2194 Stmt::child_iterator SizeOfAlignOfExpr::child_end() {
2195 if (isArgumentType())
2196 return child_iterator();
2197 return child_iterator(&Argument.Ex + 1);
2200 // ArraySubscriptExpr
2201 Stmt::child_iterator ArraySubscriptExpr::child_begin() {
2202 return &SubExprs[0];
2204 Stmt::child_iterator ArraySubscriptExpr::child_end() {
2205 return &SubExprs[0]+END_EXPR;
2209 Stmt::child_iterator CallExpr::child_begin() {
2210 return &SubExprs[0];
2212 Stmt::child_iterator CallExpr::child_end() {
2213 return &SubExprs[0]+NumArgs+ARGS_START;
2217 Stmt::child_iterator MemberExpr::child_begin() { return &Base; }
2218 Stmt::child_iterator MemberExpr::child_end() { return &Base+1; }
2220 // ExtVectorElementExpr
2221 Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; }
2222 Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; }
2224 // CompoundLiteralExpr
2225 Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; }
2226 Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; }
2229 Stmt::child_iterator CastExpr::child_begin() { return &Op; }
2230 Stmt::child_iterator CastExpr::child_end() { return &Op+1; }
2233 Stmt::child_iterator BinaryOperator::child_begin() {
2234 return &SubExprs[0];
2236 Stmt::child_iterator BinaryOperator::child_end() {
2237 return &SubExprs[0]+END_EXPR;
2240 // ConditionalOperator
2241 Stmt::child_iterator ConditionalOperator::child_begin() {
2242 return &SubExprs[0];
2244 Stmt::child_iterator ConditionalOperator::child_end() {
2245 return &SubExprs[0]+END_EXPR;
2249 Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); }
2250 Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); }
2253 Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; }
2254 Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; }
2256 // TypesCompatibleExpr
2257 Stmt::child_iterator TypesCompatibleExpr::child_begin() {
2258 return child_iterator();
2261 Stmt::child_iterator TypesCompatibleExpr::child_end() {
2262 return child_iterator();
2266 Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; }
2267 Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; }
2270 Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); }
2271 Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); }
2273 // ShuffleVectorExpr
2274 Stmt::child_iterator ShuffleVectorExpr::child_begin() {
2275 return &SubExprs[0];
2277 Stmt::child_iterator ShuffleVectorExpr::child_end() {
2278 return &SubExprs[0]+NumExprs;
2282 Stmt::child_iterator VAArgExpr::child_begin() { return &Val; }
2283 Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; }
2286 Stmt::child_iterator InitListExpr::child_begin() {
2287 return InitExprs.size() ? &InitExprs[0] : 0;
2289 Stmt::child_iterator InitListExpr::child_end() {
2290 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0;
2293 // DesignatedInitExpr
2294 Stmt::child_iterator DesignatedInitExpr::child_begin() {
2295 char* Ptr = static_cast<char*>(static_cast<void *>(this));
2296 Ptr += sizeof(DesignatedInitExpr);
2297 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr));
2299 Stmt::child_iterator DesignatedInitExpr::child_end() {
2300 return child_iterator(&*child_begin() + NumSubExprs);
2303 // ImplicitValueInitExpr
2304 Stmt::child_iterator ImplicitValueInitExpr::child_begin() {
2305 return child_iterator();
2308 Stmt::child_iterator ImplicitValueInitExpr::child_end() {
2309 return child_iterator();
2313 Stmt::child_iterator ParenListExpr::child_begin() {
2316 Stmt::child_iterator ParenListExpr::child_end() {
2317 return &Exprs[0]+NumExprs;
2320 // ObjCStringLiteral
2321 Stmt::child_iterator ObjCStringLiteral::child_begin() {
2324 Stmt::child_iterator ObjCStringLiteral::child_end() {
2329 Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); }
2330 Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); }
2333 Stmt::child_iterator ObjCSelectorExpr::child_begin() {
2334 return child_iterator();
2336 Stmt::child_iterator ObjCSelectorExpr::child_end() {
2337 return child_iterator();
2341 Stmt::child_iterator ObjCProtocolExpr::child_begin() {
2342 return child_iterator();
2344 Stmt::child_iterator ObjCProtocolExpr::child_end() {
2345 return child_iterator();
2349 Stmt::child_iterator ObjCMessageExpr::child_begin() {
2350 return getReceiver() ? &SubExprs[0] : &SubExprs[0] + ARGS_START;
2352 Stmt::child_iterator ObjCMessageExpr::child_end() {
2353 return &SubExprs[0]+ARGS_START+getNumArgs();
2357 Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); }
2358 Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); }
2360 Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();}
2361 Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); }