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/ASTContext.h"
15 #include "clang/AST/Attr.h"
16 #include "clang/AST/DeclCXX.h"
17 #include "clang/AST/DeclObjC.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/AST/EvaluatedExprVisitor.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/AST/ExprCXX.h"
22 #include "clang/AST/Mangle.h"
23 #include "clang/AST/RecordLayout.h"
24 #include "clang/AST/StmtVisitor.h"
25 #include "clang/Basic/Builtins.h"
26 #include "clang/Basic/CharInfo.h"
27 #include "clang/Basic/SourceManager.h"
28 #include "clang/Basic/TargetInfo.h"
29 #include "clang/Lex/Lexer.h"
30 #include "clang/Lex/LiteralSupport.h"
31 #include "clang/Sema/SemaDiagnostic.h"
32 #include "llvm/Support/ErrorHandling.h"
33 #include "llvm/Support/raw_ostream.h"
36 using namespace clang;
38 const Expr *Expr::getBestDynamicClassTypeExpr() const {
41 E = E->ignoreParenBaseCasts();
43 // Follow the RHS of a comma operator.
44 if (auto *BO = dyn_cast<BinaryOperator>(E)) {
45 if (BO->getOpcode() == BO_Comma) {
51 // Step into initializer for materialized temporaries.
52 if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E)) {
53 E = MTE->GetTemporaryExpr();
63 const CXXRecordDecl *Expr::getBestDynamicClassType() const {
64 const Expr *E = getBestDynamicClassTypeExpr();
65 QualType DerivedType = E->getType();
66 if (const PointerType *PTy = DerivedType->getAs<PointerType>())
67 DerivedType = PTy->getPointeeType();
69 if (DerivedType->isDependentType())
72 const RecordType *Ty = DerivedType->castAs<RecordType>();
73 Decl *D = Ty->getDecl();
74 return cast<CXXRecordDecl>(D);
77 const Expr *Expr::skipRValueSubobjectAdjustments(
78 SmallVectorImpl<const Expr *> &CommaLHSs,
79 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const {
82 E = E->IgnoreParens();
84 if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
85 if ((CE->getCastKind() == CK_DerivedToBase ||
86 CE->getCastKind() == CK_UncheckedDerivedToBase) &&
87 E->getType()->isRecordType()) {
89 CXXRecordDecl *Derived
90 = cast<CXXRecordDecl>(E->getType()->getAs<RecordType>()->getDecl());
91 Adjustments.push_back(SubobjectAdjustment(CE, Derived));
95 if (CE->getCastKind() == CK_NoOp) {
99 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
100 if (!ME->isArrow()) {
101 assert(ME->getBase()->getType()->isRecordType());
102 if (FieldDecl *Field = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
103 if (!Field->isBitField() && !Field->getType()->isReferenceType()) {
105 Adjustments.push_back(SubobjectAdjustment(Field));
110 } else if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
111 if (BO->isPtrMemOp()) {
112 assert(BO->getRHS()->isRValue());
114 const MemberPointerType *MPT =
115 BO->getRHS()->getType()->getAs<MemberPointerType>();
116 Adjustments.push_back(SubobjectAdjustment(MPT, BO->getRHS()));
118 } else if (BO->getOpcode() == BO_Comma) {
119 CommaLHSs.push_back(BO->getLHS());
131 /// isKnownToHaveBooleanValue - Return true if this is an integer expression
132 /// that is known to return 0 or 1. This happens for _Bool/bool expressions
133 /// but also int expressions which are produced by things like comparisons in
135 bool Expr::isKnownToHaveBooleanValue() const {
136 const Expr *E = IgnoreParens();
138 // If this value has _Bool type, it is obvious 0/1.
139 if (E->getType()->isBooleanType()) return true;
140 // If this is a non-scalar-integer type, we don't care enough to try.
141 if (!E->getType()->isIntegralOrEnumerationType()) return false;
143 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
144 switch (UO->getOpcode()) {
146 return UO->getSubExpr()->isKnownToHaveBooleanValue();
154 // Only look through implicit casts. If the user writes
155 // '(int) (a && b)' treat it as an arbitrary int.
156 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E))
157 return CE->getSubExpr()->isKnownToHaveBooleanValue();
159 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
160 switch (BO->getOpcode()) {
161 default: return false;
162 case BO_LT: // Relational operators.
166 case BO_EQ: // Equality operators.
168 case BO_LAnd: // AND operator.
169 case BO_LOr: // Logical OR operator.
172 case BO_And: // Bitwise AND operator.
173 case BO_Xor: // Bitwise XOR operator.
174 case BO_Or: // Bitwise OR operator.
175 // Handle things like (x==2)|(y==12).
176 return BO->getLHS()->isKnownToHaveBooleanValue() &&
177 BO->getRHS()->isKnownToHaveBooleanValue();
181 return BO->getRHS()->isKnownToHaveBooleanValue();
185 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E))
186 return CO->getTrueExpr()->isKnownToHaveBooleanValue() &&
187 CO->getFalseExpr()->isKnownToHaveBooleanValue();
192 // Amusing macro metaprogramming hack: check whether a class provides
193 // a more specific implementation of getExprLoc().
195 // See also Stmt.cpp:{getLocStart(),getLocEnd()}.
197 /// This implementation is used when a class provides a custom
198 /// implementation of getExprLoc.
199 template <class E, class T>
200 SourceLocation getExprLocImpl(const Expr *expr,
201 SourceLocation (T::*v)() const) {
202 return static_cast<const E*>(expr)->getExprLoc();
205 /// This implementation is used when a class doesn't provide
206 /// a custom implementation of getExprLoc. Overload resolution
207 /// should pick it over the implementation above because it's
208 /// more specialized according to function template partial ordering.
210 SourceLocation getExprLocImpl(const Expr *expr,
211 SourceLocation (Expr::*v)() const) {
212 return static_cast<const E*>(expr)->getLocStart();
216 SourceLocation Expr::getExprLoc() const {
217 switch (getStmtClass()) {
218 case Stmt::NoStmtClass: llvm_unreachable("statement without class");
219 #define ABSTRACT_STMT(type)
220 #define STMT(type, base) \
221 case Stmt::type##Class: break;
222 #define EXPR(type, base) \
223 case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc);
224 #include "clang/AST/StmtNodes.inc"
226 llvm_unreachable("unknown expression kind");
229 //===----------------------------------------------------------------------===//
230 // Primary Expressions.
231 //===----------------------------------------------------------------------===//
233 /// \brief Compute the type-, value-, and instantiation-dependence of a
234 /// declaration reference
235 /// based on the declaration being referenced.
236 static void computeDeclRefDependence(const ASTContext &Ctx, NamedDecl *D,
237 QualType T, bool &TypeDependent,
238 bool &ValueDependent,
239 bool &InstantiationDependent) {
240 TypeDependent = false;
241 ValueDependent = false;
242 InstantiationDependent = false;
244 // (TD) C++ [temp.dep.expr]p3:
245 // An id-expression is type-dependent if it contains:
249 // (VD) C++ [temp.dep.constexpr]p2:
250 // An identifier is value-dependent if it is:
252 // (TD) - an identifier that was declared with dependent type
253 // (VD) - a name declared with a dependent type,
254 if (T->isDependentType()) {
255 TypeDependent = true;
256 ValueDependent = true;
257 InstantiationDependent = true;
259 } else if (T->isInstantiationDependentType()) {
260 InstantiationDependent = true;
263 // (TD) - a conversion-function-id that specifies a dependent type
264 if (D->getDeclName().getNameKind()
265 == DeclarationName::CXXConversionFunctionName) {
266 QualType T = D->getDeclName().getCXXNameType();
267 if (T->isDependentType()) {
268 TypeDependent = true;
269 ValueDependent = true;
270 InstantiationDependent = true;
274 if (T->isInstantiationDependentType())
275 InstantiationDependent = true;
278 // (VD) - the name of a non-type template parameter,
279 if (isa<NonTypeTemplateParmDecl>(D)) {
280 ValueDependent = true;
281 InstantiationDependent = true;
285 // (VD) - a constant with integral or enumeration type and is
286 // initialized with an expression that is value-dependent.
287 // (VD) - a constant with literal type and is initialized with an
288 // expression that is value-dependent [C++11].
289 // (VD) - FIXME: Missing from the standard:
290 // - an entity with reference type and is initialized with an
291 // expression that is value-dependent [C++11]
292 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
293 if ((Ctx.getLangOpts().CPlusPlus11 ?
294 Var->getType()->isLiteralType(Ctx) :
295 Var->getType()->isIntegralOrEnumerationType()) &&
296 (Var->getType().isConstQualified() ||
297 Var->getType()->isReferenceType())) {
298 if (const Expr *Init = Var->getAnyInitializer())
299 if (Init->isValueDependent()) {
300 ValueDependent = true;
301 InstantiationDependent = true;
305 // (VD) - FIXME: Missing from the standard:
306 // - a member function or a static data member of the current
308 if (Var->isStaticDataMember() &&
309 Var->getDeclContext()->isDependentContext()) {
310 ValueDependent = true;
311 InstantiationDependent = true;
312 TypeSourceInfo *TInfo = Var->getFirstDecl()->getTypeSourceInfo();
313 if (TInfo->getType()->isIncompleteArrayType())
314 TypeDependent = true;
320 // (VD) - FIXME: Missing from the standard:
321 // - a member function or a static data member of the current
323 if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) {
324 ValueDependent = true;
325 InstantiationDependent = true;
329 void DeclRefExpr::computeDependence(const ASTContext &Ctx) {
330 bool TypeDependent = false;
331 bool ValueDependent = false;
332 bool InstantiationDependent = false;
333 computeDeclRefDependence(Ctx, getDecl(), getType(), TypeDependent,
334 ValueDependent, InstantiationDependent);
336 ExprBits.TypeDependent |= TypeDependent;
337 ExprBits.ValueDependent |= ValueDependent;
338 ExprBits.InstantiationDependent |= InstantiationDependent;
340 // Is the declaration a parameter pack?
341 if (getDecl()->isParameterPack())
342 ExprBits.ContainsUnexpandedParameterPack = true;
345 DeclRefExpr::DeclRefExpr(const ASTContext &Ctx,
346 NestedNameSpecifierLoc QualifierLoc,
347 SourceLocation TemplateKWLoc,
348 ValueDecl *D, bool RefersToEnclosingVariableOrCapture,
349 const DeclarationNameInfo &NameInfo,
351 const TemplateArgumentListInfo *TemplateArgs,
352 QualType T, ExprValueKind VK)
353 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false),
354 D(D), Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) {
355 DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0;
357 new (getTrailingObjects<NestedNameSpecifierLoc>())
358 NestedNameSpecifierLoc(QualifierLoc);
359 auto *NNS = QualifierLoc.getNestedNameSpecifier();
360 if (NNS->isInstantiationDependent())
361 ExprBits.InstantiationDependent = true;
362 if (NNS->containsUnexpandedParameterPack())
363 ExprBits.ContainsUnexpandedParameterPack = true;
365 DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0;
367 *getTrailingObjects<NamedDecl *>() = FoundD;
368 DeclRefExprBits.HasTemplateKWAndArgsInfo
369 = (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0;
370 DeclRefExprBits.RefersToEnclosingVariableOrCapture =
371 RefersToEnclosingVariableOrCapture;
373 bool Dependent = false;
374 bool InstantiationDependent = false;
375 bool ContainsUnexpandedParameterPack = false;
376 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
377 TemplateKWLoc, *TemplateArgs, getTrailingObjects<TemplateArgumentLoc>(),
378 Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
379 assert(!Dependent && "built a DeclRefExpr with dependent template args");
380 ExprBits.InstantiationDependent |= InstantiationDependent;
381 ExprBits.ContainsUnexpandedParameterPack |= ContainsUnexpandedParameterPack;
382 } else if (TemplateKWLoc.isValid()) {
383 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
386 DeclRefExprBits.HadMultipleCandidates = 0;
388 computeDependence(Ctx);
391 DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
392 NestedNameSpecifierLoc QualifierLoc,
393 SourceLocation TemplateKWLoc,
395 bool RefersToEnclosingVariableOrCapture,
396 SourceLocation NameLoc,
400 const TemplateArgumentListInfo *TemplateArgs) {
401 return Create(Context, QualifierLoc, TemplateKWLoc, D,
402 RefersToEnclosingVariableOrCapture,
403 DeclarationNameInfo(D->getDeclName(), NameLoc),
404 T, VK, FoundD, TemplateArgs);
407 DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
408 NestedNameSpecifierLoc QualifierLoc,
409 SourceLocation TemplateKWLoc,
411 bool RefersToEnclosingVariableOrCapture,
412 const DeclarationNameInfo &NameInfo,
416 const TemplateArgumentListInfo *TemplateArgs) {
417 // Filter out cases where the found Decl is the same as the value refenenced.
421 bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
423 totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
424 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
425 QualifierLoc ? 1 : 0, FoundD ? 1 : 0,
426 HasTemplateKWAndArgsInfo ? 1 : 0,
427 TemplateArgs ? TemplateArgs->size() : 0);
429 void *Mem = Context.Allocate(Size, alignof(DeclRefExpr));
430 return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D,
431 RefersToEnclosingVariableOrCapture,
432 NameInfo, FoundD, TemplateArgs, T, VK);
435 DeclRefExpr *DeclRefExpr::CreateEmpty(const ASTContext &Context,
438 bool HasTemplateKWAndArgsInfo,
439 unsigned NumTemplateArgs) {
440 assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
442 totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
443 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
444 HasQualifier ? 1 : 0, HasFoundDecl ? 1 : 0, HasTemplateKWAndArgsInfo,
446 void *Mem = Context.Allocate(Size, alignof(DeclRefExpr));
447 return new (Mem) DeclRefExpr(EmptyShell());
450 SourceLocation DeclRefExpr::getLocStart() const {
452 return getQualifierLoc().getBeginLoc();
453 return getNameInfo().getLocStart();
455 SourceLocation DeclRefExpr::getLocEnd() const {
456 if (hasExplicitTemplateArgs())
457 return getRAngleLoc();
458 return getNameInfo().getLocEnd();
461 PredefinedExpr::PredefinedExpr(SourceLocation L, QualType FNTy, IdentType IT,
463 : Expr(PredefinedExprClass, FNTy, VK_LValue, OK_Ordinary,
464 FNTy->isDependentType(), FNTy->isDependentType(),
465 FNTy->isInstantiationDependentType(),
466 /*ContainsUnexpandedParameterPack=*/false),
467 Loc(L), Type(IT), FnName(SL) {}
469 StringLiteral *PredefinedExpr::getFunctionName() {
470 return cast_or_null<StringLiteral>(FnName);
473 StringRef PredefinedExpr::getIdentTypeName(PredefinedExpr::IdentType IT) {
478 return "__FUNCTION__";
480 return "__FUNCDNAME__";
482 return "L__FUNCTION__";
484 return "__PRETTY_FUNCTION__";
486 return "__FUNCSIG__";
487 case PrettyFunctionNoVirtual:
490 llvm_unreachable("Unknown ident type for PredefinedExpr");
493 // FIXME: Maybe this should use DeclPrinter with a special "print predefined
494 // expr" policy instead.
495 std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) {
496 ASTContext &Context = CurrentDecl->getASTContext();
498 if (IT == PredefinedExpr::FuncDName) {
499 if (const NamedDecl *ND = dyn_cast<NamedDecl>(CurrentDecl)) {
500 std::unique_ptr<MangleContext> MC;
501 MC.reset(Context.createMangleContext());
503 if (MC->shouldMangleDeclName(ND)) {
504 SmallString<256> Buffer;
505 llvm::raw_svector_ostream Out(Buffer);
506 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(ND))
507 MC->mangleCXXCtor(CD, Ctor_Base, Out);
508 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(ND))
509 MC->mangleCXXDtor(DD, Dtor_Base, Out);
511 MC->mangleName(ND, Out);
513 if (!Buffer.empty() && Buffer.front() == '\01')
514 return Buffer.substr(1);
517 return ND->getIdentifier()->getName();
521 if (auto *BD = dyn_cast<BlockDecl>(CurrentDecl)) {
522 std::unique_ptr<MangleContext> MC;
523 MC.reset(Context.createMangleContext());
524 SmallString<256> Buffer;
525 llvm::raw_svector_ostream Out(Buffer);
526 auto DC = CurrentDecl->getDeclContext();
527 if (DC->isFileContext())
528 MC->mangleGlobalBlock(BD, /*ID*/ nullptr, Out);
529 else if (const auto *CD = dyn_cast<CXXConstructorDecl>(DC))
530 MC->mangleCtorBlock(CD, /*CT*/ Ctor_Complete, BD, Out);
531 else if (const auto *DD = dyn_cast<CXXDestructorDecl>(DC))
532 MC->mangleDtorBlock(DD, /*DT*/ Dtor_Complete, BD, Out);
534 MC->mangleBlock(DC, BD, Out);
537 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) {
538 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual && IT != FuncSig)
539 return FD->getNameAsString();
541 SmallString<256> Name;
542 llvm::raw_svector_ostream Out(Name);
544 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
545 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual)
551 PrintingPolicy Policy(Context.getLangOpts());
553 llvm::raw_string_ostream POut(Proto);
555 const FunctionDecl *Decl = FD;
556 if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern())
558 const FunctionType *AFT = Decl->getType()->getAs<FunctionType>();
559 const FunctionProtoType *FT = nullptr;
560 if (FD->hasWrittenPrototype())
561 FT = dyn_cast<FunctionProtoType>(AFT);
564 switch (FT->getCallConv()) {
565 case CC_C: POut << "__cdecl "; break;
566 case CC_X86StdCall: POut << "__stdcall "; break;
567 case CC_X86FastCall: POut << "__fastcall "; break;
568 case CC_X86ThisCall: POut << "__thiscall "; break;
569 case CC_X86VectorCall: POut << "__vectorcall "; break;
570 case CC_X86RegCall: POut << "__regcall "; break;
571 // Only bother printing the conventions that MSVC knows about.
576 FD->printQualifiedName(POut, Policy);
580 for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) {
582 POut << Decl->getParamDecl(i)->getType().stream(Policy);
585 if (FT->isVariadic()) {
586 if (FD->getNumParams()) POut << ", ";
592 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
593 const FunctionType *FT = MD->getType()->castAs<FunctionType>();
596 if (FT->isVolatile())
598 RefQualifierKind Ref = MD->getRefQualifier();
599 if (Ref == RQ_LValue)
601 else if (Ref == RQ_RValue)
605 typedef SmallVector<const ClassTemplateSpecializationDecl *, 8> SpecsTy;
607 const DeclContext *Ctx = FD->getDeclContext();
608 while (Ctx && isa<NamedDecl>(Ctx)) {
609 const ClassTemplateSpecializationDecl *Spec
610 = dyn_cast<ClassTemplateSpecializationDecl>(Ctx);
611 if (Spec && !Spec->isExplicitSpecialization())
612 Specs.push_back(Spec);
613 Ctx = Ctx->getParent();
616 std::string TemplateParams;
617 llvm::raw_string_ostream TOut(TemplateParams);
618 for (SpecsTy::reverse_iterator I = Specs.rbegin(), E = Specs.rend();
620 const TemplateParameterList *Params
621 = (*I)->getSpecializedTemplate()->getTemplateParameters();
622 const TemplateArgumentList &Args = (*I)->getTemplateArgs();
623 assert(Params->size() == Args.size());
624 for (unsigned i = 0, numParams = Params->size(); i != numParams; ++i) {
625 StringRef Param = Params->getParam(i)->getName();
626 if (Param.empty()) continue;
627 TOut << Param << " = ";
628 Args.get(i).print(Policy, TOut);
633 FunctionTemplateSpecializationInfo *FSI
634 = FD->getTemplateSpecializationInfo();
635 if (FSI && !FSI->isExplicitSpecialization()) {
636 const TemplateParameterList* Params
637 = FSI->getTemplate()->getTemplateParameters();
638 const TemplateArgumentList* Args = FSI->TemplateArguments;
639 assert(Params->size() == Args->size());
640 for (unsigned i = 0, e = Params->size(); i != e; ++i) {
641 StringRef Param = Params->getParam(i)->getName();
642 if (Param.empty()) continue;
643 TOut << Param << " = ";
644 Args->get(i).print(Policy, TOut);
650 if (!TemplateParams.empty()) {
651 // remove the trailing comma and space
652 TemplateParams.resize(TemplateParams.size() - 2);
653 POut << " [" << TemplateParams << "]";
658 // Print "auto" for all deduced return types. This includes C++1y return
659 // type deduction and lambdas. For trailing return types resolve the
660 // decltype expression. Otherwise print the real type when this is
661 // not a constructor or destructor.
662 if (isa<CXXMethodDecl>(FD) &&
663 cast<CXXMethodDecl>(FD)->getParent()->isLambda())
664 Proto = "auto " + Proto;
665 else if (FT && FT->getReturnType()->getAs<DecltypeType>())
667 ->getAs<DecltypeType>()
668 ->getUnderlyingType()
669 .getAsStringInternal(Proto, Policy);
670 else if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD))
671 AFT->getReturnType().getAsStringInternal(Proto, Policy);
675 return Name.str().str();
677 if (const CapturedDecl *CD = dyn_cast<CapturedDecl>(CurrentDecl)) {
678 for (const DeclContext *DC = CD->getParent(); DC; DC = DC->getParent())
679 // Skip to its enclosing function or method, but not its enclosing
681 if (DC->isFunctionOrMethod() && (DC->getDeclKind() != Decl::Captured)) {
682 const Decl *D = Decl::castFromDeclContext(DC);
683 return ComputeName(IT, D);
685 llvm_unreachable("CapturedDecl not inside a function or method");
687 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) {
688 SmallString<256> Name;
689 llvm::raw_svector_ostream Out(Name);
690 Out << (MD->isInstanceMethod() ? '-' : '+');
693 // For incorrect code, there might not be an ObjCInterfaceDecl. Do
694 // a null check to avoid a crash.
695 if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
698 if (const ObjCCategoryImplDecl *CID =
699 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext()))
700 Out << '(' << *CID << ')';
703 MD->getSelector().print(Out);
706 return Name.str().str();
708 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) {
709 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
715 void APNumericStorage::setIntValue(const ASTContext &C,
716 const llvm::APInt &Val) {
720 BitWidth = Val.getBitWidth();
721 unsigned NumWords = Val.getNumWords();
722 const uint64_t* Words = Val.getRawData();
724 pVal = new (C) uint64_t[NumWords];
725 std::copy(Words, Words + NumWords, pVal);
726 } else if (NumWords == 1)
732 IntegerLiteral::IntegerLiteral(const ASTContext &C, const llvm::APInt &V,
733 QualType type, SourceLocation l)
734 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false,
737 assert(type->isIntegerType() && "Illegal type in IntegerLiteral");
738 assert(V.getBitWidth() == C.getIntWidth(type) &&
739 "Integer type is not the correct size for constant.");
744 IntegerLiteral::Create(const ASTContext &C, const llvm::APInt &V,
745 QualType type, SourceLocation l) {
746 return new (C) IntegerLiteral(C, V, type, l);
750 IntegerLiteral::Create(const ASTContext &C, EmptyShell Empty) {
751 return new (C) IntegerLiteral(Empty);
754 FloatingLiteral::FloatingLiteral(const ASTContext &C, const llvm::APFloat &V,
755 bool isexact, QualType Type, SourceLocation L)
756 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false,
757 false, false), Loc(L) {
758 setSemantics(V.getSemantics());
759 FloatingLiteralBits.IsExact = isexact;
763 FloatingLiteral::FloatingLiteral(const ASTContext &C, EmptyShell Empty)
764 : Expr(FloatingLiteralClass, Empty) {
765 setRawSemantics(IEEEhalf);
766 FloatingLiteralBits.IsExact = false;
770 FloatingLiteral::Create(const ASTContext &C, const llvm::APFloat &V,
771 bool isexact, QualType Type, SourceLocation L) {
772 return new (C) FloatingLiteral(C, V, isexact, Type, L);
776 FloatingLiteral::Create(const ASTContext &C, EmptyShell Empty) {
777 return new (C) FloatingLiteral(C, Empty);
780 const llvm::fltSemantics &FloatingLiteral::getSemantics() const {
781 switch(FloatingLiteralBits.Semantics) {
783 return llvm::APFloat::IEEEhalf;
785 return llvm::APFloat::IEEEsingle;
787 return llvm::APFloat::IEEEdouble;
788 case x87DoubleExtended:
789 return llvm::APFloat::x87DoubleExtended;
791 return llvm::APFloat::IEEEquad;
792 case PPCDoubleDouble:
793 return llvm::APFloat::PPCDoubleDouble;
795 llvm_unreachable("Unrecognised floating semantics");
798 void FloatingLiteral::setSemantics(const llvm::fltSemantics &Sem) {
799 if (&Sem == &llvm::APFloat::IEEEhalf)
800 FloatingLiteralBits.Semantics = IEEEhalf;
801 else if (&Sem == &llvm::APFloat::IEEEsingle)
802 FloatingLiteralBits.Semantics = IEEEsingle;
803 else if (&Sem == &llvm::APFloat::IEEEdouble)
804 FloatingLiteralBits.Semantics = IEEEdouble;
805 else if (&Sem == &llvm::APFloat::x87DoubleExtended)
806 FloatingLiteralBits.Semantics = x87DoubleExtended;
807 else if (&Sem == &llvm::APFloat::IEEEquad)
808 FloatingLiteralBits.Semantics = IEEEquad;
809 else if (&Sem == &llvm::APFloat::PPCDoubleDouble)
810 FloatingLiteralBits.Semantics = PPCDoubleDouble;
812 llvm_unreachable("Unknown floating semantics");
815 /// getValueAsApproximateDouble - This returns the value as an inaccurate
816 /// double. Note that this may cause loss of precision, but is useful for
817 /// debugging dumps, etc.
818 double FloatingLiteral::getValueAsApproximateDouble() const {
819 llvm::APFloat V = getValue();
821 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
823 return V.convertToDouble();
826 int StringLiteral::mapCharByteWidth(TargetInfo const &target,StringKind k) {
827 int CharByteWidth = 0;
831 CharByteWidth = target.getCharWidth();
834 CharByteWidth = target.getWCharWidth();
837 CharByteWidth = target.getChar16Width();
840 CharByteWidth = target.getChar32Width();
843 assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple");
845 assert((CharByteWidth==1 || CharByteWidth==2 || CharByteWidth==4)
846 && "character byte widths supported are 1, 2, and 4 only");
847 return CharByteWidth;
850 StringLiteral *StringLiteral::Create(const ASTContext &C, StringRef Str,
851 StringKind Kind, bool Pascal, QualType Ty,
852 const SourceLocation *Loc,
854 assert(C.getAsConstantArrayType(Ty) &&
855 "StringLiteral must be of constant array type!");
857 // Allocate enough space for the StringLiteral plus an array of locations for
858 // any concatenated string tokens.
860 C.Allocate(sizeof(StringLiteral) + sizeof(SourceLocation) * (NumStrs - 1),
861 alignof(StringLiteral));
862 StringLiteral *SL = new (Mem) StringLiteral(Ty);
864 // OPTIMIZE: could allocate this appended to the StringLiteral.
865 SL->setString(C,Str,Kind,Pascal);
867 SL->TokLocs[0] = Loc[0];
868 SL->NumConcatenated = NumStrs;
871 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1));
875 StringLiteral *StringLiteral::CreateEmpty(const ASTContext &C,
878 C.Allocate(sizeof(StringLiteral) + sizeof(SourceLocation) * (NumStrs - 1),
879 alignof(StringLiteral));
880 StringLiteral *SL = new (Mem) StringLiteral(QualType());
881 SL->CharByteWidth = 0;
883 SL->NumConcatenated = NumStrs;
887 void StringLiteral::outputString(raw_ostream &OS) const {
889 case Ascii: break; // no prefix.
890 case Wide: OS << 'L'; break;
891 case UTF8: OS << "u8"; break;
892 case UTF16: OS << 'u'; break;
893 case UTF32: OS << 'U'; break;
896 static const char Hex[] = "0123456789ABCDEF";
898 unsigned LastSlashX = getLength();
899 for (unsigned I = 0, N = getLength(); I != N; ++I) {
900 switch (uint32_t Char = getCodeUnit(I)) {
902 // FIXME: Convert UTF-8 back to codepoints before rendering.
904 // Convert UTF-16 surrogate pairs back to codepoints before rendering.
905 // Leave invalid surrogates alone; we'll use \x for those.
906 if (getKind() == UTF16 && I != N - 1 && Char >= 0xd800 &&
908 uint32_t Trail = getCodeUnit(I + 1);
909 if (Trail >= 0xdc00 && Trail <= 0xdfff) {
910 Char = 0x10000 + ((Char - 0xd800) << 10) + (Trail - 0xdc00);
916 // If this is a wide string, output characters over 0xff using \x
917 // escapes. Otherwise, this is a UTF-16 or UTF-32 string, and Char is a
918 // codepoint: use \x escapes for invalid codepoints.
919 if (getKind() == Wide ||
920 (Char >= 0xd800 && Char <= 0xdfff) || Char >= 0x110000) {
921 // FIXME: Is this the best way to print wchar_t?
924 while ((Char >> Shift) == 0)
926 for (/**/; Shift >= 0; Shift -= 4)
927 OS << Hex[(Char >> Shift) & 15];
934 << Hex[(Char >> 20) & 15]
935 << Hex[(Char >> 16) & 15];
938 OS << Hex[(Char >> 12) & 15]
939 << Hex[(Char >> 8) & 15]
940 << Hex[(Char >> 4) & 15]
941 << Hex[(Char >> 0) & 15];
945 // If we used \x... for the previous character, and this character is a
946 // hexadecimal digit, prevent it being slurped as part of the \x.
947 if (LastSlashX + 1 == I) {
949 case '0': case '1': case '2': case '3': case '4':
950 case '5': case '6': case '7': case '8': case '9':
951 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
952 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
957 assert(Char <= 0xff &&
958 "Characters above 0xff should already have been handled.");
960 if (isPrintable(Char))
962 else // Output anything hard as an octal escape.
964 << (char)('0' + ((Char >> 6) & 7))
965 << (char)('0' + ((Char >> 3) & 7))
966 << (char)('0' + ((Char >> 0) & 7));
968 // Handle some common non-printable cases to make dumps prettier.
969 case '\\': OS << "\\\\"; break;
970 case '"': OS << "\\\""; break;
971 case '\n': OS << "\\n"; break;
972 case '\t': OS << "\\t"; break;
973 case '\a': OS << "\\a"; break;
974 case '\b': OS << "\\b"; break;
980 void StringLiteral::setString(const ASTContext &C, StringRef Str,
981 StringKind Kind, bool IsPascal) {
982 //FIXME: we assume that the string data comes from a target that uses the same
983 // code unit size and endianess for the type of string.
985 this->IsPascal = IsPascal;
987 CharByteWidth = mapCharByteWidth(C.getTargetInfo(),Kind);
988 assert((Str.size()%CharByteWidth == 0)
989 && "size of data must be multiple of CharByteWidth");
990 Length = Str.size()/CharByteWidth;
992 switch(CharByteWidth) {
994 char *AStrData = new (C) char[Length];
995 std::memcpy(AStrData,Str.data(),Length*sizeof(*AStrData));
996 StrData.asChar = AStrData;
1000 uint16_t *AStrData = new (C) uint16_t[Length];
1001 std::memcpy(AStrData,Str.data(),Length*sizeof(*AStrData));
1002 StrData.asUInt16 = AStrData;
1006 uint32_t *AStrData = new (C) uint32_t[Length];
1007 std::memcpy(AStrData,Str.data(),Length*sizeof(*AStrData));
1008 StrData.asUInt32 = AStrData;
1012 llvm_unreachable("unsupported CharByteWidth");
1016 /// getLocationOfByte - Return a source location that points to the specified
1017 /// byte of this string literal.
1019 /// Strings are amazingly complex. They can be formed from multiple tokens and
1020 /// can have escape sequences in them in addition to the usual trigraph and
1021 /// escaped newline business. This routine handles this complexity.
1023 /// The *StartToken sets the first token to be searched in this function and
1024 /// the *StartTokenByteOffset is the byte offset of the first token. Before
1025 /// returning, it updates the *StartToken to the TokNo of the token being found
1026 /// and sets *StartTokenByteOffset to the byte offset of the token in the
1028 /// Using these two parameters can reduce the time complexity from O(n^2) to
1029 /// O(n) if one wants to get the location of byte for all the tokens in a
1033 StringLiteral::getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
1034 const LangOptions &Features,
1035 const TargetInfo &Target, unsigned *StartToken,
1036 unsigned *StartTokenByteOffset) const {
1037 assert((Kind == StringLiteral::Ascii || Kind == StringLiteral::UTF8) &&
1038 "Only narrow string literals are currently supported");
1040 // Loop over all of the tokens in this string until we find the one that
1041 // contains the byte we're looking for.
1043 unsigned StringOffset = 0;
1045 TokNo = *StartToken;
1046 if (StartTokenByteOffset) {
1047 StringOffset = *StartTokenByteOffset;
1048 ByteNo -= StringOffset;
1051 assert(TokNo < getNumConcatenated() && "Invalid byte number!");
1052 SourceLocation StrTokLoc = getStrTokenLoc(TokNo);
1054 // Get the spelling of the string so that we can get the data that makes up
1055 // the string literal, not the identifier for the macro it is potentially
1056 // expanded through.
1057 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc);
1059 // Re-lex the token to get its length and original spelling.
1060 std::pair<FileID, unsigned> LocInfo =
1061 SM.getDecomposedLoc(StrTokSpellingLoc);
1062 bool Invalid = false;
1063 StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid);
1065 if (StartTokenByteOffset != nullptr)
1066 *StartTokenByteOffset = StringOffset;
1067 if (StartToken != nullptr)
1068 *StartToken = TokNo;
1069 return StrTokSpellingLoc;
1072 const char *StrData = Buffer.data()+LocInfo.second;
1074 // Create a lexer starting at the beginning of this token.
1075 Lexer TheLexer(SM.getLocForStartOfFile(LocInfo.first), Features,
1076 Buffer.begin(), StrData, Buffer.end());
1078 TheLexer.LexFromRawLexer(TheTok);
1080 // Use the StringLiteralParser to compute the length of the string in bytes.
1081 StringLiteralParser SLP(TheTok, SM, Features, Target);
1082 unsigned TokNumBytes = SLP.GetStringLength();
1084 // If the byte is in this token, return the location of the byte.
1085 if (ByteNo < TokNumBytes ||
1086 (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) {
1087 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo);
1089 // Now that we know the offset of the token in the spelling, use the
1090 // preprocessor to get the offset in the original source.
1091 if (StartTokenByteOffset != nullptr)
1092 *StartTokenByteOffset = StringOffset;
1093 if (StartToken != nullptr)
1094 *StartToken = TokNo;
1095 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features);
1098 // Move to the next string token.
1099 StringOffset += TokNumBytes;
1101 ByteNo -= TokNumBytes;
1107 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1108 /// corresponds to, e.g. "sizeof" or "[pre]++".
1109 StringRef UnaryOperator::getOpcodeStr(Opcode Op) {
1111 #define UNARY_OPERATION(Name, Spelling) case UO_##Name: return Spelling;
1112 #include "clang/AST/OperationKinds.def"
1114 llvm_unreachable("Unknown unary operator");
1118 UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
1120 default: llvm_unreachable("No unary operator for overloaded function");
1121 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc;
1122 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec;
1123 case OO_Amp: return UO_AddrOf;
1124 case OO_Star: return UO_Deref;
1125 case OO_Plus: return UO_Plus;
1126 case OO_Minus: return UO_Minus;
1127 case OO_Tilde: return UO_Not;
1128 case OO_Exclaim: return UO_LNot;
1129 case OO_Coawait: return UO_Coawait;
1133 OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
1135 case UO_PostInc: case UO_PreInc: return OO_PlusPlus;
1136 case UO_PostDec: case UO_PreDec: return OO_MinusMinus;
1137 case UO_AddrOf: return OO_Amp;
1138 case UO_Deref: return OO_Star;
1139 case UO_Plus: return OO_Plus;
1140 case UO_Minus: return OO_Minus;
1141 case UO_Not: return OO_Tilde;
1142 case UO_LNot: return OO_Exclaim;
1143 case UO_Coawait: return OO_Coawait;
1144 default: return OO_None;
1149 //===----------------------------------------------------------------------===//
1150 // Postfix Operators.
1151 //===----------------------------------------------------------------------===//
1153 CallExpr::CallExpr(const ASTContext &C, StmtClass SC, Expr *fn,
1154 ArrayRef<Expr *> preargs, ArrayRef<Expr *> args, QualType t,
1155 ExprValueKind VK, SourceLocation rparenloc)
1156 : Expr(SC, t, VK, OK_Ordinary, fn->isTypeDependent(),
1157 fn->isValueDependent(), fn->isInstantiationDependent(),
1158 fn->containsUnexpandedParameterPack()),
1159 NumArgs(args.size()) {
1161 unsigned NumPreArgs = preargs.size();
1162 SubExprs = new (C) Stmt *[args.size()+PREARGS_START+NumPreArgs];
1164 for (unsigned i = 0; i != NumPreArgs; ++i) {
1165 updateDependenciesFromArg(preargs[i]);
1166 SubExprs[i+PREARGS_START] = preargs[i];
1168 for (unsigned i = 0; i != args.size(); ++i) {
1169 updateDependenciesFromArg(args[i]);
1170 SubExprs[i+PREARGS_START+NumPreArgs] = args[i];
1173 CallExprBits.NumPreArgs = NumPreArgs;
1174 RParenLoc = rparenloc;
1177 CallExpr::CallExpr(const ASTContext &C, StmtClass SC, Expr *fn,
1178 ArrayRef<Expr *> args, QualType t, ExprValueKind VK,
1179 SourceLocation rparenloc)
1180 : CallExpr(C, SC, fn, ArrayRef<Expr *>(), args, t, VK, rparenloc) {}
1182 CallExpr::CallExpr(const ASTContext &C, Expr *fn, ArrayRef<Expr *> args,
1183 QualType t, ExprValueKind VK, SourceLocation rparenloc)
1184 : CallExpr(C, CallExprClass, fn, ArrayRef<Expr *>(), args, t, VK, rparenloc) {
1187 CallExpr::CallExpr(const ASTContext &C, StmtClass SC, EmptyShell Empty)
1188 : CallExpr(C, SC, /*NumPreArgs=*/0, Empty) {}
1190 CallExpr::CallExpr(const ASTContext &C, StmtClass SC, unsigned NumPreArgs,
1192 : Expr(SC, Empty), SubExprs(nullptr), NumArgs(0) {
1193 // FIXME: Why do we allocate this?
1194 SubExprs = new (C) Stmt*[PREARGS_START+NumPreArgs]();
1195 CallExprBits.NumPreArgs = NumPreArgs;
1198 void CallExpr::updateDependenciesFromArg(Expr *Arg) {
1199 if (Arg->isTypeDependent())
1200 ExprBits.TypeDependent = true;
1201 if (Arg->isValueDependent())
1202 ExprBits.ValueDependent = true;
1203 if (Arg->isInstantiationDependent())
1204 ExprBits.InstantiationDependent = true;
1205 if (Arg->containsUnexpandedParameterPack())
1206 ExprBits.ContainsUnexpandedParameterPack = true;
1209 FunctionDecl *CallExpr::getDirectCallee() {
1210 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl());
1213 Decl *CallExpr::getCalleeDecl() {
1214 return getCallee()->getReferencedDeclOfCallee();
1217 Decl *Expr::getReferencedDeclOfCallee() {
1218 Expr *CEE = IgnoreParenImpCasts();
1220 while (SubstNonTypeTemplateParmExpr *NTTP
1221 = dyn_cast<SubstNonTypeTemplateParmExpr>(CEE)) {
1222 CEE = NTTP->getReplacement()->IgnoreParenCasts();
1225 // If we're calling a dereference, look at the pointer instead.
1226 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) {
1227 if (BO->isPtrMemOp())
1228 CEE = BO->getRHS()->IgnoreParenCasts();
1229 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) {
1230 if (UO->getOpcode() == UO_Deref)
1231 CEE = UO->getSubExpr()->IgnoreParenCasts();
1233 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE))
1234 return DRE->getDecl();
1235 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE))
1236 return ME->getMemberDecl();
1241 /// setNumArgs - This changes the number of arguments present in this call.
1242 /// Any orphaned expressions are deleted by this, and any new operands are set
1244 void CallExpr::setNumArgs(const ASTContext& C, unsigned NumArgs) {
1245 // No change, just return.
1246 if (NumArgs == getNumArgs()) return;
1248 // If shrinking # arguments, just delete the extras and forgot them.
1249 if (NumArgs < getNumArgs()) {
1250 this->NumArgs = NumArgs;
1254 // Otherwise, we are growing the # arguments. New an bigger argument array.
1255 unsigned NumPreArgs = getNumPreArgs();
1256 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+PREARGS_START+NumPreArgs];
1258 for (unsigned i = 0; i != getNumArgs()+PREARGS_START+NumPreArgs; ++i)
1259 NewSubExprs[i] = SubExprs[i];
1260 // Null out new args.
1261 for (unsigned i = getNumArgs()+PREARGS_START+NumPreArgs;
1262 i != NumArgs+PREARGS_START+NumPreArgs; ++i)
1263 NewSubExprs[i] = nullptr;
1265 if (SubExprs) C.Deallocate(SubExprs);
1266 SubExprs = NewSubExprs;
1267 this->NumArgs = NumArgs;
1270 /// getBuiltinCallee - If this is a call to a builtin, return the builtin ID. If
1272 unsigned CallExpr::getBuiltinCallee() const {
1273 // All simple function calls (e.g. func()) are implicitly cast to pointer to
1274 // function. As a result, we try and obtain the DeclRefExpr from the
1275 // ImplicitCastExpr.
1276 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee());
1277 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()).
1280 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr());
1284 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl());
1288 if (!FDecl->getIdentifier())
1291 return FDecl->getBuiltinID();
1294 bool CallExpr::isUnevaluatedBuiltinCall(const ASTContext &Ctx) const {
1295 if (unsigned BI = getBuiltinCallee())
1296 return Ctx.BuiltinInfo.isUnevaluated(BI);
1300 QualType CallExpr::getCallReturnType(const ASTContext &Ctx) const {
1301 const Expr *Callee = getCallee();
1302 QualType CalleeType = Callee->getType();
1303 if (const auto *FnTypePtr = CalleeType->getAs<PointerType>()) {
1304 CalleeType = FnTypePtr->getPointeeType();
1305 } else if (const auto *BPT = CalleeType->getAs<BlockPointerType>()) {
1306 CalleeType = BPT->getPointeeType();
1307 } else if (CalleeType->isSpecificPlaceholderType(BuiltinType::BoundMember)) {
1308 if (isa<CXXPseudoDestructorExpr>(Callee->IgnoreParens()))
1311 // This should never be overloaded and so should never return null.
1312 CalleeType = Expr::findBoundMemberType(Callee);
1315 const FunctionType *FnType = CalleeType->castAs<FunctionType>();
1316 return FnType->getReturnType();
1319 SourceLocation CallExpr::getLocStart() const {
1320 if (isa<CXXOperatorCallExpr>(this))
1321 return cast<CXXOperatorCallExpr>(this)->getLocStart();
1323 SourceLocation begin = getCallee()->getLocStart();
1324 if (begin.isInvalid() && getNumArgs() > 0 && getArg(0))
1325 begin = getArg(0)->getLocStart();
1328 SourceLocation CallExpr::getLocEnd() const {
1329 if (isa<CXXOperatorCallExpr>(this))
1330 return cast<CXXOperatorCallExpr>(this)->getLocEnd();
1332 SourceLocation end = getRParenLoc();
1333 if (end.isInvalid() && getNumArgs() > 0 && getArg(getNumArgs() - 1))
1334 end = getArg(getNumArgs() - 1)->getLocEnd();
1338 OffsetOfExpr *OffsetOfExpr::Create(const ASTContext &C, QualType type,
1339 SourceLocation OperatorLoc,
1340 TypeSourceInfo *tsi,
1341 ArrayRef<OffsetOfNode> comps,
1342 ArrayRef<Expr*> exprs,
1343 SourceLocation RParenLoc) {
1344 void *Mem = C.Allocate(
1345 totalSizeToAlloc<OffsetOfNode, Expr *>(comps.size(), exprs.size()));
1347 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, comps, exprs,
1351 OffsetOfExpr *OffsetOfExpr::CreateEmpty(const ASTContext &C,
1352 unsigned numComps, unsigned numExprs) {
1354 C.Allocate(totalSizeToAlloc<OffsetOfNode, Expr *>(numComps, numExprs));
1355 return new (Mem) OffsetOfExpr(numComps, numExprs);
1358 OffsetOfExpr::OffsetOfExpr(const ASTContext &C, QualType type,
1359 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
1360 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs,
1361 SourceLocation RParenLoc)
1362 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary,
1363 /*TypeDependent=*/false,
1364 /*ValueDependent=*/tsi->getType()->isDependentType(),
1365 tsi->getType()->isInstantiationDependentType(),
1366 tsi->getType()->containsUnexpandedParameterPack()),
1367 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi),
1368 NumComps(comps.size()), NumExprs(exprs.size())
1370 for (unsigned i = 0; i != comps.size(); ++i) {
1371 setComponent(i, comps[i]);
1374 for (unsigned i = 0; i != exprs.size(); ++i) {
1375 if (exprs[i]->isTypeDependent() || exprs[i]->isValueDependent())
1376 ExprBits.ValueDependent = true;
1377 if (exprs[i]->containsUnexpandedParameterPack())
1378 ExprBits.ContainsUnexpandedParameterPack = true;
1380 setIndexExpr(i, exprs[i]);
1384 IdentifierInfo *OffsetOfNode::getFieldName() const {
1385 assert(getKind() == Field || getKind() == Identifier);
1386 if (getKind() == Field)
1387 return getField()->getIdentifier();
1389 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask);
1392 UnaryExprOrTypeTraitExpr::UnaryExprOrTypeTraitExpr(
1393 UnaryExprOrTypeTrait ExprKind, Expr *E, QualType resultType,
1394 SourceLocation op, SourceLocation rp)
1395 : Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary,
1396 false, // Never type-dependent (C++ [temp.dep.expr]p3).
1397 // Value-dependent if the argument is type-dependent.
1398 E->isTypeDependent(), E->isInstantiationDependent(),
1399 E->containsUnexpandedParameterPack()),
1400 OpLoc(op), RParenLoc(rp) {
1401 UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
1402 UnaryExprOrTypeTraitExprBits.IsType = false;
1405 // Check to see if we are in the situation where alignof(decl) should be
1406 // dependent because decl's alignment is dependent.
1407 if (ExprKind == UETT_AlignOf) {
1408 if (!isValueDependent() || !isInstantiationDependent()) {
1409 E = E->IgnoreParens();
1411 const ValueDecl *D = nullptr;
1412 if (const auto *DRE = dyn_cast<DeclRefExpr>(E))
1414 else if (const auto *ME = dyn_cast<MemberExpr>(E))
1415 D = ME->getMemberDecl();
1418 for (const auto *I : D->specific_attrs<AlignedAttr>()) {
1419 if (I->isAlignmentDependent()) {
1420 setValueDependent(true);
1421 setInstantiationDependent(true);
1430 MemberExpr *MemberExpr::Create(
1431 const ASTContext &C, Expr *base, bool isarrow, SourceLocation OperatorLoc,
1432 NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
1433 ValueDecl *memberdecl, DeclAccessPair founddecl,
1434 DeclarationNameInfo nameinfo, const TemplateArgumentListInfo *targs,
1435 QualType ty, ExprValueKind vk, ExprObjectKind ok) {
1437 bool hasQualOrFound = (QualifierLoc ||
1438 founddecl.getDecl() != memberdecl ||
1439 founddecl.getAccess() != memberdecl->getAccess());
1441 bool HasTemplateKWAndArgsInfo = targs || TemplateKWLoc.isValid();
1443 totalSizeToAlloc<MemberExprNameQualifier, ASTTemplateKWAndArgsInfo,
1444 TemplateArgumentLoc>(hasQualOrFound ? 1 : 0,
1445 HasTemplateKWAndArgsInfo ? 1 : 0,
1446 targs ? targs->size() : 0);
1448 void *Mem = C.Allocate(Size, alignof(MemberExpr));
1449 MemberExpr *E = new (Mem)
1450 MemberExpr(base, isarrow, OperatorLoc, memberdecl, nameinfo, ty, vk, ok);
1452 if (hasQualOrFound) {
1453 // FIXME: Wrong. We should be looking at the member declaration we found.
1454 if (QualifierLoc && QualifierLoc.getNestedNameSpecifier()->isDependent()) {
1455 E->setValueDependent(true);
1456 E->setTypeDependent(true);
1457 E->setInstantiationDependent(true);
1459 else if (QualifierLoc &&
1460 QualifierLoc.getNestedNameSpecifier()->isInstantiationDependent())
1461 E->setInstantiationDependent(true);
1463 E->HasQualifierOrFoundDecl = true;
1465 MemberExprNameQualifier *NQ =
1466 E->getTrailingObjects<MemberExprNameQualifier>();
1467 NQ->QualifierLoc = QualifierLoc;
1468 NQ->FoundDecl = founddecl;
1471 E->HasTemplateKWAndArgsInfo = (targs || TemplateKWLoc.isValid());
1474 bool Dependent = false;
1475 bool InstantiationDependent = false;
1476 bool ContainsUnexpandedParameterPack = false;
1477 E->getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1478 TemplateKWLoc, *targs, E->getTrailingObjects<TemplateArgumentLoc>(),
1479 Dependent, InstantiationDependent, ContainsUnexpandedParameterPack);
1480 if (InstantiationDependent)
1481 E->setInstantiationDependent(true);
1482 } else if (TemplateKWLoc.isValid()) {
1483 E->getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1490 SourceLocation MemberExpr::getLocStart() const {
1491 if (isImplicitAccess()) {
1493 return getQualifierLoc().getBeginLoc();
1497 // FIXME: We don't want this to happen. Rather, we should be able to
1498 // detect all kinds of implicit accesses more cleanly.
1499 SourceLocation BaseStartLoc = getBase()->getLocStart();
1500 if (BaseStartLoc.isValid())
1501 return BaseStartLoc;
1504 SourceLocation MemberExpr::getLocEnd() const {
1505 SourceLocation EndLoc = getMemberNameInfo().getEndLoc();
1506 if (hasExplicitTemplateArgs())
1507 EndLoc = getRAngleLoc();
1508 else if (EndLoc.isInvalid())
1509 EndLoc = getBase()->getLocEnd();
1513 bool CastExpr::CastConsistency() const {
1514 switch (getCastKind()) {
1515 case CK_DerivedToBase:
1516 case CK_UncheckedDerivedToBase:
1517 case CK_DerivedToBaseMemberPointer:
1518 case CK_BaseToDerived:
1519 case CK_BaseToDerivedMemberPointer:
1520 assert(!path_empty() && "Cast kind should have a base path!");
1523 case CK_CPointerToObjCPointerCast:
1524 assert(getType()->isObjCObjectPointerType());
1525 assert(getSubExpr()->getType()->isPointerType());
1526 goto CheckNoBasePath;
1528 case CK_BlockPointerToObjCPointerCast:
1529 assert(getType()->isObjCObjectPointerType());
1530 assert(getSubExpr()->getType()->isBlockPointerType());
1531 goto CheckNoBasePath;
1533 case CK_ReinterpretMemberPointer:
1534 assert(getType()->isMemberPointerType());
1535 assert(getSubExpr()->getType()->isMemberPointerType());
1536 goto CheckNoBasePath;
1539 // Arbitrary casts to C pointer types count as bitcasts.
1540 // Otherwise, we should only have block and ObjC pointer casts
1541 // here if they stay within the type kind.
1542 if (!getType()->isPointerType()) {
1543 assert(getType()->isObjCObjectPointerType() ==
1544 getSubExpr()->getType()->isObjCObjectPointerType());
1545 assert(getType()->isBlockPointerType() ==
1546 getSubExpr()->getType()->isBlockPointerType());
1548 goto CheckNoBasePath;
1550 case CK_AnyPointerToBlockPointerCast:
1551 assert(getType()->isBlockPointerType());
1552 assert(getSubExpr()->getType()->isAnyPointerType() &&
1553 !getSubExpr()->getType()->isBlockPointerType());
1554 goto CheckNoBasePath;
1556 case CK_CopyAndAutoreleaseBlockObject:
1557 assert(getType()->isBlockPointerType());
1558 assert(getSubExpr()->getType()->isBlockPointerType());
1559 goto CheckNoBasePath;
1561 case CK_FunctionToPointerDecay:
1562 assert(getType()->isPointerType());
1563 assert(getSubExpr()->getType()->isFunctionType());
1564 goto CheckNoBasePath;
1566 case CK_AddressSpaceConversion:
1567 assert(getType()->isPointerType());
1568 assert(getSubExpr()->getType()->isPointerType());
1569 assert(getType()->getPointeeType().getAddressSpace() !=
1570 getSubExpr()->getType()->getPointeeType().getAddressSpace());
1571 // These should not have an inheritance path.
1574 case CK_ArrayToPointerDecay:
1575 case CK_NullToMemberPointer:
1576 case CK_NullToPointer:
1577 case CK_ConstructorConversion:
1578 case CK_IntegralToPointer:
1579 case CK_PointerToIntegral:
1581 case CK_VectorSplat:
1582 case CK_IntegralCast:
1583 case CK_BooleanToSignedIntegral:
1584 case CK_IntegralToFloating:
1585 case CK_FloatingToIntegral:
1586 case CK_FloatingCast:
1587 case CK_ObjCObjectLValueCast:
1588 case CK_FloatingRealToComplex:
1589 case CK_FloatingComplexToReal:
1590 case CK_FloatingComplexCast:
1591 case CK_FloatingComplexToIntegralComplex:
1592 case CK_IntegralRealToComplex:
1593 case CK_IntegralComplexToReal:
1594 case CK_IntegralComplexCast:
1595 case CK_IntegralComplexToFloatingComplex:
1596 case CK_ARCProduceObject:
1597 case CK_ARCConsumeObject:
1598 case CK_ARCReclaimReturnedObject:
1599 case CK_ARCExtendBlockObject:
1600 case CK_ZeroToOCLEvent:
1601 case CK_IntToOCLSampler:
1602 assert(!getType()->isBooleanType() && "unheralded conversion to bool");
1603 goto CheckNoBasePath;
1606 case CK_LValueToRValue:
1608 case CK_AtomicToNonAtomic:
1609 case CK_NonAtomicToAtomic:
1610 case CK_PointerToBoolean:
1611 case CK_IntegralToBoolean:
1612 case CK_FloatingToBoolean:
1613 case CK_MemberPointerToBoolean:
1614 case CK_FloatingComplexToBoolean:
1615 case CK_IntegralComplexToBoolean:
1616 case CK_LValueBitCast: // -> bool&
1617 case CK_UserDefinedConversion: // operator bool()
1618 case CK_BuiltinFnToFnPtr:
1620 assert(path_empty() && "Cast kind should not have a base path!");
1626 const char *CastExpr::getCastKindName() const {
1627 switch (getCastKind()) {
1628 #define CAST_OPERATION(Name) case CK_##Name: return #Name;
1629 #include "clang/AST/OperationKinds.def"
1631 llvm_unreachable("Unhandled cast kind!");
1634 Expr *CastExpr::getSubExprAsWritten() {
1635 Expr *SubExpr = nullptr;
1638 SubExpr = E->getSubExpr();
1640 // Skip through reference binding to temporary.
1641 if (MaterializeTemporaryExpr *Materialize
1642 = dyn_cast<MaterializeTemporaryExpr>(SubExpr))
1643 SubExpr = Materialize->GetTemporaryExpr();
1645 // Skip any temporary bindings; they're implicit.
1646 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr))
1647 SubExpr = Binder->getSubExpr();
1649 // Conversions by constructor and conversion functions have a
1650 // subexpression describing the call; strip it off.
1651 if (E->getCastKind() == CK_ConstructorConversion)
1652 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0);
1653 else if (E->getCastKind() == CK_UserDefinedConversion) {
1654 assert((isa<CXXMemberCallExpr>(SubExpr) ||
1655 isa<BlockExpr>(SubExpr)) &&
1656 "Unexpected SubExpr for CK_UserDefinedConversion.");
1657 if (isa<CXXMemberCallExpr>(SubExpr))
1658 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument();
1661 // If the subexpression we're left with is an implicit cast, look
1662 // through that, too.
1663 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr)));
1668 CXXBaseSpecifier **CastExpr::path_buffer() {
1669 switch (getStmtClass()) {
1670 #define ABSTRACT_STMT(x)
1671 #define CASTEXPR(Type, Base) \
1672 case Stmt::Type##Class: \
1673 return static_cast<Type *>(this)->getTrailingObjects<CXXBaseSpecifier *>();
1674 #define STMT(Type, Base)
1675 #include "clang/AST/StmtNodes.inc"
1677 llvm_unreachable("non-cast expressions not possible here");
1681 ImplicitCastExpr *ImplicitCastExpr::Create(const ASTContext &C, QualType T,
1682 CastKind Kind, Expr *Operand,
1683 const CXXCastPath *BasePath,
1685 unsigned PathSize = (BasePath ? BasePath->size() : 0);
1686 void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
1687 ImplicitCastExpr *E =
1688 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK);
1690 std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
1691 E->getTrailingObjects<CXXBaseSpecifier *>());
1695 ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(const ASTContext &C,
1696 unsigned PathSize) {
1697 void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
1698 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize);
1702 CStyleCastExpr *CStyleCastExpr::Create(const ASTContext &C, QualType T,
1703 ExprValueKind VK, CastKind K, Expr *Op,
1704 const CXXCastPath *BasePath,
1705 TypeSourceInfo *WrittenTy,
1706 SourceLocation L, SourceLocation R) {
1707 unsigned PathSize = (BasePath ? BasePath->size() : 0);
1708 void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
1710 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R);
1712 std::uninitialized_copy_n(BasePath->data(), BasePath->size(),
1713 E->getTrailingObjects<CXXBaseSpecifier *>());
1717 CStyleCastExpr *CStyleCastExpr::CreateEmpty(const ASTContext &C,
1718 unsigned PathSize) {
1719 void *Buffer = C.Allocate(totalSizeToAlloc<CXXBaseSpecifier *>(PathSize));
1720 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize);
1723 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1724 /// corresponds to, e.g. "<<=".
1725 StringRef BinaryOperator::getOpcodeStr(Opcode Op) {
1727 #define BINARY_OPERATION(Name, Spelling) case BO_##Name: return Spelling;
1728 #include "clang/AST/OperationKinds.def"
1730 llvm_unreachable("Invalid OpCode!");
1734 BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
1736 default: llvm_unreachable("Not an overloadable binary operator");
1737 case OO_Plus: return BO_Add;
1738 case OO_Minus: return BO_Sub;
1739 case OO_Star: return BO_Mul;
1740 case OO_Slash: return BO_Div;
1741 case OO_Percent: return BO_Rem;
1742 case OO_Caret: return BO_Xor;
1743 case OO_Amp: return BO_And;
1744 case OO_Pipe: return BO_Or;
1745 case OO_Equal: return BO_Assign;
1746 case OO_Less: return BO_LT;
1747 case OO_Greater: return BO_GT;
1748 case OO_PlusEqual: return BO_AddAssign;
1749 case OO_MinusEqual: return BO_SubAssign;
1750 case OO_StarEqual: return BO_MulAssign;
1751 case OO_SlashEqual: return BO_DivAssign;
1752 case OO_PercentEqual: return BO_RemAssign;
1753 case OO_CaretEqual: return BO_XorAssign;
1754 case OO_AmpEqual: return BO_AndAssign;
1755 case OO_PipeEqual: return BO_OrAssign;
1756 case OO_LessLess: return BO_Shl;
1757 case OO_GreaterGreater: return BO_Shr;
1758 case OO_LessLessEqual: return BO_ShlAssign;
1759 case OO_GreaterGreaterEqual: return BO_ShrAssign;
1760 case OO_EqualEqual: return BO_EQ;
1761 case OO_ExclaimEqual: return BO_NE;
1762 case OO_LessEqual: return BO_LE;
1763 case OO_GreaterEqual: return BO_GE;
1764 case OO_AmpAmp: return BO_LAnd;
1765 case OO_PipePipe: return BO_LOr;
1766 case OO_Comma: return BO_Comma;
1767 case OO_ArrowStar: return BO_PtrMemI;
1771 OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
1772 static const OverloadedOperatorKind OverOps[] = {
1773 /* .* Cannot be overloaded */OO_None, OO_ArrowStar,
1774 OO_Star, OO_Slash, OO_Percent,
1776 OO_LessLess, OO_GreaterGreater,
1777 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
1778 OO_EqualEqual, OO_ExclaimEqual,
1784 OO_Equal, OO_StarEqual,
1785 OO_SlashEqual, OO_PercentEqual,
1786 OO_PlusEqual, OO_MinusEqual,
1787 OO_LessLessEqual, OO_GreaterGreaterEqual,
1788 OO_AmpEqual, OO_CaretEqual,
1792 return OverOps[Opc];
1795 InitListExpr::InitListExpr(const ASTContext &C, SourceLocation lbraceloc,
1796 ArrayRef<Expr*> initExprs, SourceLocation rbraceloc)
1797 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false,
1799 InitExprs(C, initExprs.size()),
1800 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), AltForm(nullptr, true)
1802 sawArrayRangeDesignator(false);
1803 for (unsigned I = 0; I != initExprs.size(); ++I) {
1804 if (initExprs[I]->isTypeDependent())
1805 ExprBits.TypeDependent = true;
1806 if (initExprs[I]->isValueDependent())
1807 ExprBits.ValueDependent = true;
1808 if (initExprs[I]->isInstantiationDependent())
1809 ExprBits.InstantiationDependent = true;
1810 if (initExprs[I]->containsUnexpandedParameterPack())
1811 ExprBits.ContainsUnexpandedParameterPack = true;
1814 InitExprs.insert(C, InitExprs.end(), initExprs.begin(), initExprs.end());
1817 void InitListExpr::reserveInits(const ASTContext &C, unsigned NumInits) {
1818 if (NumInits > InitExprs.size())
1819 InitExprs.reserve(C, NumInits);
1822 void InitListExpr::resizeInits(const ASTContext &C, unsigned NumInits) {
1823 InitExprs.resize(C, NumInits, nullptr);
1826 Expr *InitListExpr::updateInit(const ASTContext &C, unsigned Init, Expr *expr) {
1827 if (Init >= InitExprs.size()) {
1828 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, nullptr);
1829 setInit(Init, expr);
1833 Expr *Result = cast_or_null<Expr>(InitExprs[Init]);
1834 setInit(Init, expr);
1838 void InitListExpr::setArrayFiller(Expr *filler) {
1839 assert(!hasArrayFiller() && "Filler already set!");
1840 ArrayFillerOrUnionFieldInit = filler;
1841 // Fill out any "holes" in the array due to designated initializers.
1842 Expr **inits = getInits();
1843 for (unsigned i = 0, e = getNumInits(); i != e; ++i)
1844 if (inits[i] == nullptr)
1848 bool InitListExpr::isStringLiteralInit() const {
1849 if (getNumInits() != 1)
1851 const ArrayType *AT = getType()->getAsArrayTypeUnsafe();
1852 if (!AT || !AT->getElementType()->isIntegerType())
1854 // It is possible for getInit() to return null.
1855 const Expr *Init = getInit(0);
1858 Init = Init->IgnoreParens();
1859 return isa<StringLiteral>(Init) || isa<ObjCEncodeExpr>(Init);
1862 SourceLocation InitListExpr::getLocStart() const {
1863 if (InitListExpr *SyntacticForm = getSyntacticForm())
1864 return SyntacticForm->getLocStart();
1865 SourceLocation Beg = LBraceLoc;
1866 if (Beg.isInvalid()) {
1867 // Find the first non-null initializer.
1868 for (InitExprsTy::const_iterator I = InitExprs.begin(),
1869 E = InitExprs.end();
1872 Beg = S->getLocStart();
1880 SourceLocation InitListExpr::getLocEnd() const {
1881 if (InitListExpr *SyntacticForm = getSyntacticForm())
1882 return SyntacticForm->getLocEnd();
1883 SourceLocation End = RBraceLoc;
1884 if (End.isInvalid()) {
1885 // Find the first non-null initializer from the end.
1886 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(),
1887 E = InitExprs.rend();
1890 End = S->getLocEnd();
1898 /// getFunctionType - Return the underlying function type for this block.
1900 const FunctionProtoType *BlockExpr::getFunctionType() const {
1901 // The block pointer is never sugared, but the function type might be.
1902 return cast<BlockPointerType>(getType())
1903 ->getPointeeType()->castAs<FunctionProtoType>();
1906 SourceLocation BlockExpr::getCaretLocation() const {
1907 return TheBlock->getCaretLocation();
1909 const Stmt *BlockExpr::getBody() const {
1910 return TheBlock->getBody();
1912 Stmt *BlockExpr::getBody() {
1913 return TheBlock->getBody();
1917 //===----------------------------------------------------------------------===//
1918 // Generic Expression Routines
1919 //===----------------------------------------------------------------------===//
1921 /// isUnusedResultAWarning - Return true if this immediate expression should
1922 /// be warned about if the result is unused. If so, fill in Loc and Ranges
1923 /// with location to warn on and the source range[s] to report with the
1925 bool Expr::isUnusedResultAWarning(const Expr *&WarnE, SourceLocation &Loc,
1926 SourceRange &R1, SourceRange &R2,
1927 ASTContext &Ctx) const {
1928 // Don't warn if the expr is type dependent. The type could end up
1929 // instantiating to void.
1930 if (isTypeDependent())
1933 switch (getStmtClass()) {
1935 if (getType()->isVoidType())
1939 R1 = getSourceRange();
1941 case ParenExprClass:
1942 return cast<ParenExpr>(this)->getSubExpr()->
1943 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
1944 case GenericSelectionExprClass:
1945 return cast<GenericSelectionExpr>(this)->getResultExpr()->
1946 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
1947 case ChooseExprClass:
1948 return cast<ChooseExpr>(this)->getChosenSubExpr()->
1949 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
1950 case UnaryOperatorClass: {
1951 const UnaryOperator *UO = cast<UnaryOperator>(this);
1953 switch (UO->getOpcode()) {
1962 // This is just the 'operator co_await' call inside the guts of a
1963 // dependent co_await call.
1967 case UO_PreDec: // ++/--
1968 return false; // Not a warning.
1971 // accessing a piece of a volatile complex is a side-effect.
1972 if (Ctx.getCanonicalType(UO->getSubExpr()->getType())
1973 .isVolatileQualified())
1977 return UO->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
1980 Loc = UO->getOperatorLoc();
1981 R1 = UO->getSubExpr()->getSourceRange();
1984 case BinaryOperatorClass: {
1985 const BinaryOperator *BO = cast<BinaryOperator>(this);
1986 switch (BO->getOpcode()) {
1989 // Consider the RHS of comma for side effects. LHS was checked by
1990 // Sema::CheckCommaOperands.
1992 // ((foo = <blah>), 0) is an idiom for hiding the result (and
1993 // lvalue-ness) of an assignment written in a macro.
1994 if (IntegerLiteral *IE =
1995 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens()))
1996 if (IE->getValue() == 0)
1998 return BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
1999 // Consider '||', '&&' to have side effects if the LHS or RHS does.
2002 if (!BO->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) ||
2003 !BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx))
2007 if (BO->isAssignmentOp())
2010 Loc = BO->getOperatorLoc();
2011 R1 = BO->getLHS()->getSourceRange();
2012 R2 = BO->getRHS()->getSourceRange();
2015 case CompoundAssignOperatorClass:
2016 case VAArgExprClass:
2017 case AtomicExprClass:
2020 case ConditionalOperatorClass: {
2021 // If only one of the LHS or RHS is a warning, the operator might
2022 // be being used for control flow. Only warn if both the LHS and
2023 // RHS are warnings.
2024 const ConditionalOperator *Exp = cast<ConditionalOperator>(this);
2025 if (!Exp->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx))
2029 return Exp->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2032 case MemberExprClass:
2034 Loc = cast<MemberExpr>(this)->getMemberLoc();
2035 R1 = SourceRange(Loc, Loc);
2036 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange();
2039 case ArraySubscriptExprClass:
2041 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc();
2042 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange();
2043 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange();
2046 case CXXOperatorCallExprClass: {
2047 // Warn about operator ==,!=,<,>,<=, and >= even when user-defined operator
2048 // overloads as there is no reasonable way to define these such that they
2049 // have non-trivial, desirable side-effects. See the -Wunused-comparison
2050 // warning: operators == and != are commonly typo'ed, and so warning on them
2051 // provides additional value as well. If this list is updated,
2052 // DiagnoseUnusedComparison should be as well.
2053 const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(this);
2054 switch (Op->getOperator()) {
2058 case OO_ExclaimEqual:
2061 case OO_GreaterEqual:
2063 if (Op->getCallReturnType(Ctx)->isReferenceType() ||
2064 Op->getCallReturnType(Ctx)->isVoidType())
2067 Loc = Op->getOperatorLoc();
2068 R1 = Op->getSourceRange();
2072 // Fallthrough for generic call handling.
2075 case CXXMemberCallExprClass:
2076 case UserDefinedLiteralClass: {
2077 // If this is a direct call, get the callee.
2078 const CallExpr *CE = cast<CallExpr>(this);
2079 if (const Decl *FD = CE->getCalleeDecl()) {
2080 const FunctionDecl *Func = dyn_cast<FunctionDecl>(FD);
2081 bool HasWarnUnusedResultAttr = Func ? Func->hasUnusedResultAttr()
2082 : FD->hasAttr<WarnUnusedResultAttr>();
2084 // If the callee has attribute pure, const, or warn_unused_result, warn
2085 // about it. void foo() { strlen("bar"); } should warn.
2087 // Note: If new cases are added here, DiagnoseUnusedExprResult should be
2088 // updated to match for QoI.
2089 if (HasWarnUnusedResultAttr ||
2090 FD->hasAttr<PureAttr>() || FD->hasAttr<ConstAttr>()) {
2092 Loc = CE->getCallee()->getLocStart();
2093 R1 = CE->getCallee()->getSourceRange();
2095 if (unsigned NumArgs = CE->getNumArgs())
2096 R2 = SourceRange(CE->getArg(0)->getLocStart(),
2097 CE->getArg(NumArgs-1)->getLocEnd());
2104 // If we don't know precisely what we're looking at, let's not warn.
2105 case UnresolvedLookupExprClass:
2106 case CXXUnresolvedConstructExprClass:
2109 case CXXTemporaryObjectExprClass:
2110 case CXXConstructExprClass: {
2111 if (const CXXRecordDecl *Type = getType()->getAsCXXRecordDecl()) {
2112 if (Type->hasAttr<WarnUnusedAttr>()) {
2114 Loc = getLocStart();
2115 R1 = getSourceRange();
2122 case ObjCMessageExprClass: {
2123 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this);
2124 if (Ctx.getLangOpts().ObjCAutoRefCount &&
2125 ME->isInstanceMessage() &&
2126 !ME->getType()->isVoidType() &&
2127 ME->getMethodFamily() == OMF_init) {
2130 R1 = ME->getSourceRange();
2134 if (const ObjCMethodDecl *MD = ME->getMethodDecl())
2135 if (MD->hasAttr<WarnUnusedResultAttr>()) {
2144 case ObjCPropertyRefExprClass:
2147 R1 = getSourceRange();
2150 case PseudoObjectExprClass: {
2151 const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this);
2153 // Only complain about things that have the form of a getter.
2154 if (isa<UnaryOperator>(PO->getSyntacticForm()) ||
2155 isa<BinaryOperator>(PO->getSyntacticForm()))
2160 R1 = getSourceRange();
2164 case StmtExprClass: {
2165 // Statement exprs don't logically have side effects themselves, but are
2166 // sometimes used in macros in ways that give them a type that is unused.
2167 // For example ({ blah; foo(); }) will end up with a type if foo has a type.
2168 // however, if the result of the stmt expr is dead, we don't want to emit a
2170 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt();
2171 if (!CS->body_empty()) {
2172 if (const Expr *E = dyn_cast<Expr>(CS->body_back()))
2173 return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2174 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back()))
2175 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt()))
2176 return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2179 if (getType()->isVoidType())
2182 Loc = cast<StmtExpr>(this)->getLParenLoc();
2183 R1 = getSourceRange();
2186 case CXXFunctionalCastExprClass:
2187 case CStyleCastExprClass: {
2188 // Ignore an explicit cast to void unless the operand is a non-trivial
2190 const CastExpr *CE = cast<CastExpr>(this);
2191 if (CE->getCastKind() == CK_ToVoid) {
2192 if (CE->getSubExpr()->isGLValue() &&
2193 CE->getSubExpr()->getType().isVolatileQualified()) {
2194 const DeclRefExpr *DRE =
2195 dyn_cast<DeclRefExpr>(CE->getSubExpr()->IgnoreParens());
2196 if (!(DRE && isa<VarDecl>(DRE->getDecl()) &&
2197 cast<VarDecl>(DRE->getDecl())->hasLocalStorage())) {
2198 return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc,
2205 // If this is a cast to a constructor conversion, check the operand.
2206 // Otherwise, the result of the cast is unused.
2207 if (CE->getCastKind() == CK_ConstructorConversion)
2208 return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2211 if (const CXXFunctionalCastExpr *CXXCE =
2212 dyn_cast<CXXFunctionalCastExpr>(this)) {
2213 Loc = CXXCE->getLocStart();
2214 R1 = CXXCE->getSubExpr()->getSourceRange();
2216 const CStyleCastExpr *CStyleCE = cast<CStyleCastExpr>(this);
2217 Loc = CStyleCE->getLParenLoc();
2218 R1 = CStyleCE->getSubExpr()->getSourceRange();
2222 case ImplicitCastExprClass: {
2223 const CastExpr *ICE = cast<ImplicitCastExpr>(this);
2225 // lvalue-to-rvalue conversion on a volatile lvalue is a side-effect.
2226 if (ICE->getCastKind() == CK_LValueToRValue &&
2227 ICE->getSubExpr()->getType().isVolatileQualified())
2230 return ICE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2232 case CXXDefaultArgExprClass:
2233 return (cast<CXXDefaultArgExpr>(this)
2234 ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2235 case CXXDefaultInitExprClass:
2236 return (cast<CXXDefaultInitExpr>(this)
2237 ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2239 case CXXNewExprClass:
2240 // FIXME: In theory, there might be new expressions that don't have side
2241 // effects (e.g. a placement new with an uninitialized POD).
2242 case CXXDeleteExprClass:
2244 case CXXBindTemporaryExprClass:
2245 return (cast<CXXBindTemporaryExpr>(this)
2246 ->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2247 case ExprWithCleanupsClass:
2248 return (cast<ExprWithCleanups>(this)
2249 ->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2253 /// isOBJCGCCandidate - Check if an expression is objc gc'able.
2254 /// returns true, if it is; false otherwise.
2255 bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
2256 const Expr *E = IgnoreParens();
2257 switch (E->getStmtClass()) {
2260 case ObjCIvarRefExprClass:
2262 case Expr::UnaryOperatorClass:
2263 return cast<UnaryOperator>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
2264 case ImplicitCastExprClass:
2265 return cast<ImplicitCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
2266 case MaterializeTemporaryExprClass:
2267 return cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr()
2268 ->isOBJCGCCandidate(Ctx);
2269 case CStyleCastExprClass:
2270 return cast<CStyleCastExpr>(E)->getSubExpr()->isOBJCGCCandidate(Ctx);
2271 case DeclRefExprClass: {
2272 const Decl *D = cast<DeclRefExpr>(E)->getDecl();
2274 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
2275 if (VD->hasGlobalStorage())
2277 QualType T = VD->getType();
2278 // dereferencing to a pointer is always a gc'able candidate,
2279 // unless it is __weak.
2280 return T->isPointerType() &&
2281 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak);
2285 case MemberExprClass: {
2286 const MemberExpr *M = cast<MemberExpr>(E);
2287 return M->getBase()->isOBJCGCCandidate(Ctx);
2289 case ArraySubscriptExprClass:
2290 return cast<ArraySubscriptExpr>(E)->getBase()->isOBJCGCCandidate(Ctx);
2294 bool Expr::isBoundMemberFunction(ASTContext &Ctx) const {
2295 if (isTypeDependent())
2297 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction;
2300 QualType Expr::findBoundMemberType(const Expr *expr) {
2301 assert(expr->hasPlaceholderType(BuiltinType::BoundMember));
2303 // Bound member expressions are always one of these possibilities:
2304 // x->m x.m x->*y x.*y
2305 // (possibly parenthesized)
2307 expr = expr->IgnoreParens();
2308 if (const MemberExpr *mem = dyn_cast<MemberExpr>(expr)) {
2309 assert(isa<CXXMethodDecl>(mem->getMemberDecl()));
2310 return mem->getMemberDecl()->getType();
2313 if (const BinaryOperator *op = dyn_cast<BinaryOperator>(expr)) {
2314 QualType type = op->getRHS()->getType()->castAs<MemberPointerType>()
2316 assert(type->isFunctionType());
2320 assert(isa<UnresolvedMemberExpr>(expr) || isa<CXXPseudoDestructorExpr>(expr));
2324 Expr* Expr::IgnoreParens() {
2327 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) {
2328 E = P->getSubExpr();
2331 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) {
2332 if (P->getOpcode() == UO_Extension) {
2333 E = P->getSubExpr();
2337 if (GenericSelectionExpr* P = dyn_cast<GenericSelectionExpr>(E)) {
2338 if (!P->isResultDependent()) {
2339 E = P->getResultExpr();
2343 if (ChooseExpr* P = dyn_cast<ChooseExpr>(E)) {
2344 if (!P->isConditionDependent()) {
2345 E = P->getChosenSubExpr();
2353 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr
2354 /// or CastExprs or ImplicitCastExprs, returning their operand.
2355 Expr *Expr::IgnoreParenCasts() {
2358 E = E->IgnoreParens();
2359 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
2360 E = P->getSubExpr();
2363 if (MaterializeTemporaryExpr *Materialize
2364 = dyn_cast<MaterializeTemporaryExpr>(E)) {
2365 E = Materialize->GetTemporaryExpr();
2368 if (SubstNonTypeTemplateParmExpr *NTTP
2369 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
2370 E = NTTP->getReplacement();
2377 Expr *Expr::IgnoreCasts() {
2380 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
2381 E = P->getSubExpr();
2384 if (MaterializeTemporaryExpr *Materialize
2385 = dyn_cast<MaterializeTemporaryExpr>(E)) {
2386 E = Materialize->GetTemporaryExpr();
2389 if (SubstNonTypeTemplateParmExpr *NTTP
2390 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
2391 E = NTTP->getReplacement();
2398 /// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue
2399 /// casts. This is intended purely as a temporary workaround for code
2400 /// that hasn't yet been rewritten to do the right thing about those
2401 /// casts, and may disappear along with the last internal use.
2402 Expr *Expr::IgnoreParenLValueCasts() {
2405 E = E->IgnoreParens();
2406 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
2407 if (P->getCastKind() == CK_LValueToRValue) {
2408 E = P->getSubExpr();
2411 } else if (MaterializeTemporaryExpr *Materialize
2412 = dyn_cast<MaterializeTemporaryExpr>(E)) {
2413 E = Materialize->GetTemporaryExpr();
2415 } else if (SubstNonTypeTemplateParmExpr *NTTP
2416 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
2417 E = NTTP->getReplacement();
2425 Expr *Expr::ignoreParenBaseCasts() {
2428 E = E->IgnoreParens();
2429 if (CastExpr *CE = dyn_cast<CastExpr>(E)) {
2430 if (CE->getCastKind() == CK_DerivedToBase ||
2431 CE->getCastKind() == CK_UncheckedDerivedToBase ||
2432 CE->getCastKind() == CK_NoOp) {
2433 E = CE->getSubExpr();
2442 Expr *Expr::IgnoreParenImpCasts() {
2445 E = E->IgnoreParens();
2446 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) {
2447 E = P->getSubExpr();
2450 if (MaterializeTemporaryExpr *Materialize
2451 = dyn_cast<MaterializeTemporaryExpr>(E)) {
2452 E = Materialize->GetTemporaryExpr();
2455 if (SubstNonTypeTemplateParmExpr *NTTP
2456 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
2457 E = NTTP->getReplacement();
2464 Expr *Expr::IgnoreConversionOperator() {
2465 if (CXXMemberCallExpr *MCE = dyn_cast<CXXMemberCallExpr>(this)) {
2466 if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl()))
2467 return MCE->getImplicitObjectArgument();
2472 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the
2473 /// value (including ptr->int casts of the same size). Strip off any
2474 /// ParenExpr or CastExprs, returning their operand.
2475 Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) {
2478 E = E->IgnoreParens();
2480 if (CastExpr *P = dyn_cast<CastExpr>(E)) {
2481 // We ignore integer <-> casts that are of the same width, ptr<->ptr and
2482 // ptr<->int casts of the same width. We also ignore all identity casts.
2483 Expr *SE = P->getSubExpr();
2485 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) {
2490 if ((E->getType()->isPointerType() ||
2491 E->getType()->isIntegralType(Ctx)) &&
2492 (SE->getType()->isPointerType() ||
2493 SE->getType()->isIntegralType(Ctx)) &&
2494 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) {
2500 if (SubstNonTypeTemplateParmExpr *NTTP
2501 = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
2502 E = NTTP->getReplacement();
2510 bool Expr::isDefaultArgument() const {
2511 const Expr *E = this;
2512 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E))
2513 E = M->GetTemporaryExpr();
2515 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
2516 E = ICE->getSubExprAsWritten();
2518 return isa<CXXDefaultArgExpr>(E);
2521 /// \brief Skip over any no-op casts and any temporary-binding
2523 static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) {
2524 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(E))
2525 E = M->GetTemporaryExpr();
2527 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2528 if (ICE->getCastKind() == CK_NoOp)
2529 E = ICE->getSubExpr();
2534 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E))
2535 E = BE->getSubExpr();
2537 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2538 if (ICE->getCastKind() == CK_NoOp)
2539 E = ICE->getSubExpr();
2544 return E->IgnoreParens();
2547 /// isTemporaryObject - Determines if this expression produces a
2548 /// temporary of the given class type.
2549 bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const {
2550 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy)))
2553 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this);
2555 // Temporaries are by definition pr-values of class type.
2556 if (!E->Classify(C).isPRValue()) {
2557 // In this context, property reference is a message call and is pr-value.
2558 if (!isa<ObjCPropertyRefExpr>(E))
2562 // Black-list a few cases which yield pr-values of class type that don't
2563 // refer to temporaries of that type:
2565 // - implicit derived-to-base conversions
2566 if (isa<ImplicitCastExpr>(E)) {
2567 switch (cast<ImplicitCastExpr>(E)->getCastKind()) {
2568 case CK_DerivedToBase:
2569 case CK_UncheckedDerivedToBase:
2576 // - member expressions (all)
2577 if (isa<MemberExpr>(E))
2580 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E))
2581 if (BO->isPtrMemOp())
2584 // - opaque values (all)
2585 if (isa<OpaqueValueExpr>(E))
2591 bool Expr::isImplicitCXXThis() const {
2592 const Expr *E = this;
2594 // Strip away parentheses and casts we don't care about.
2596 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(E)) {
2597 E = Paren->getSubExpr();
2601 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
2602 if (ICE->getCastKind() == CK_NoOp ||
2603 ICE->getCastKind() == CK_LValueToRValue ||
2604 ICE->getCastKind() == CK_DerivedToBase ||
2605 ICE->getCastKind() == CK_UncheckedDerivedToBase) {
2606 E = ICE->getSubExpr();
2611 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(E)) {
2612 if (UnOp->getOpcode() == UO_Extension) {
2613 E = UnOp->getSubExpr();
2618 if (const MaterializeTemporaryExpr *M
2619 = dyn_cast<MaterializeTemporaryExpr>(E)) {
2620 E = M->GetTemporaryExpr();
2627 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(E))
2628 return This->isImplicit();
2633 /// hasAnyTypeDependentArguments - Determines if any of the expressions
2634 /// in Exprs is type-dependent.
2635 bool Expr::hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs) {
2636 for (unsigned I = 0; I < Exprs.size(); ++I)
2637 if (Exprs[I]->isTypeDependent())
2643 bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef,
2644 const Expr **Culprit) const {
2645 // This function is attempting whether an expression is an initializer
2646 // which can be evaluated at compile-time. It very closely parallels
2647 // ConstExprEmitter in CGExprConstant.cpp; if they don't match, it
2648 // will lead to unexpected results. Like ConstExprEmitter, it falls back
2649 // to isEvaluatable most of the time.
2651 // If we ever capture reference-binding directly in the AST, we can
2652 // kill the second parameter.
2656 if (EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects)
2663 switch (getStmtClass()) {
2665 case StringLiteralClass:
2666 case ObjCEncodeExprClass:
2668 case CXXTemporaryObjectExprClass:
2669 case CXXConstructExprClass: {
2670 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this);
2672 if (CE->getConstructor()->isTrivial() &&
2673 CE->getConstructor()->getParent()->hasTrivialDestructor()) {
2674 // Trivial default constructor
2675 if (!CE->getNumArgs()) return true;
2677 // Trivial copy constructor
2678 assert(CE->getNumArgs() == 1 && "trivial ctor with > 1 argument");
2679 return CE->getArg(0)->isConstantInitializer(Ctx, false, Culprit);
2684 case CompoundLiteralExprClass: {
2685 // This handles gcc's extension that allows global initializers like
2686 // "struct x {int x;} x = (struct x) {};".
2687 // FIXME: This accepts other cases it shouldn't!
2688 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer();
2689 return Exp->isConstantInitializer(Ctx, false, Culprit);
2691 case DesignatedInitUpdateExprClass: {
2692 const DesignatedInitUpdateExpr *DIUE = cast<DesignatedInitUpdateExpr>(this);
2693 return DIUE->getBase()->isConstantInitializer(Ctx, false, Culprit) &&
2694 DIUE->getUpdater()->isConstantInitializer(Ctx, false, Culprit);
2696 case InitListExprClass: {
2697 const InitListExpr *ILE = cast<InitListExpr>(this);
2698 if (ILE->getType()->isArrayType()) {
2699 unsigned numInits = ILE->getNumInits();
2700 for (unsigned i = 0; i < numInits; i++) {
2701 if (!ILE->getInit(i)->isConstantInitializer(Ctx, false, Culprit))
2707 if (ILE->getType()->isRecordType()) {
2708 unsigned ElementNo = 0;
2709 RecordDecl *RD = ILE->getType()->getAs<RecordType>()->getDecl();
2710 for (const auto *Field : RD->fields()) {
2711 // If this is a union, skip all the fields that aren't being initialized.
2712 if (RD->isUnion() && ILE->getInitializedFieldInUnion() != Field)
2715 // Don't emit anonymous bitfields, they just affect layout.
2716 if (Field->isUnnamedBitfield())
2719 if (ElementNo < ILE->getNumInits()) {
2720 const Expr *Elt = ILE->getInit(ElementNo++);
2721 if (Field->isBitField()) {
2722 // Bitfields have to evaluate to an integer.
2723 llvm::APSInt ResultTmp;
2724 if (!Elt->EvaluateAsInt(ResultTmp, Ctx)) {
2730 bool RefType = Field->getType()->isReferenceType();
2731 if (!Elt->isConstantInitializer(Ctx, RefType, Culprit))
2741 case ImplicitValueInitExprClass:
2742 case NoInitExprClass:
2744 case ParenExprClass:
2745 return cast<ParenExpr>(this)->getSubExpr()
2746 ->isConstantInitializer(Ctx, IsForRef, Culprit);
2747 case GenericSelectionExprClass:
2748 return cast<GenericSelectionExpr>(this)->getResultExpr()
2749 ->isConstantInitializer(Ctx, IsForRef, Culprit);
2750 case ChooseExprClass:
2751 if (cast<ChooseExpr>(this)->isConditionDependent()) {
2756 return cast<ChooseExpr>(this)->getChosenSubExpr()
2757 ->isConstantInitializer(Ctx, IsForRef, Culprit);
2758 case UnaryOperatorClass: {
2759 const UnaryOperator* Exp = cast<UnaryOperator>(this);
2760 if (Exp->getOpcode() == UO_Extension)
2761 return Exp->getSubExpr()->isConstantInitializer(Ctx, false, Culprit);
2764 case CXXFunctionalCastExprClass:
2765 case CXXStaticCastExprClass:
2766 case ImplicitCastExprClass:
2767 case CStyleCastExprClass:
2768 case ObjCBridgedCastExprClass:
2769 case CXXDynamicCastExprClass:
2770 case CXXReinterpretCastExprClass:
2771 case CXXConstCastExprClass: {
2772 const CastExpr *CE = cast<CastExpr>(this);
2774 // Handle misc casts we want to ignore.
2775 if (CE->getCastKind() == CK_NoOp ||
2776 CE->getCastKind() == CK_LValueToRValue ||
2777 CE->getCastKind() == CK_ToUnion ||
2778 CE->getCastKind() == CK_ConstructorConversion ||
2779 CE->getCastKind() == CK_NonAtomicToAtomic ||
2780 CE->getCastKind() == CK_AtomicToNonAtomic ||
2781 CE->getCastKind() == CK_IntToOCLSampler)
2782 return CE->getSubExpr()->isConstantInitializer(Ctx, false, Culprit);
2786 case MaterializeTemporaryExprClass:
2787 return cast<MaterializeTemporaryExpr>(this)->GetTemporaryExpr()
2788 ->isConstantInitializer(Ctx, false, Culprit);
2790 case SubstNonTypeTemplateParmExprClass:
2791 return cast<SubstNonTypeTemplateParmExpr>(this)->getReplacement()
2792 ->isConstantInitializer(Ctx, false, Culprit);
2793 case CXXDefaultArgExprClass:
2794 return cast<CXXDefaultArgExpr>(this)->getExpr()
2795 ->isConstantInitializer(Ctx, false, Culprit);
2796 case CXXDefaultInitExprClass:
2797 return cast<CXXDefaultInitExpr>(this)->getExpr()
2798 ->isConstantInitializer(Ctx, false, Culprit);
2800 // Allow certain forms of UB in constant initializers: signed integer
2801 // overflow and floating-point division by zero. We'll give a warning on
2802 // these, but they're common enough that we have to accept them.
2803 if (isEvaluatable(Ctx, SE_AllowUndefinedBehavior))
2811 /// \brief Look for any side effects within a Stmt.
2812 class SideEffectFinder : public ConstEvaluatedExprVisitor<SideEffectFinder> {
2813 typedef ConstEvaluatedExprVisitor<SideEffectFinder> Inherited;
2814 const bool IncludePossibleEffects;
2815 bool HasSideEffects;
2818 explicit SideEffectFinder(const ASTContext &Context, bool IncludePossible)
2819 : Inherited(Context),
2820 IncludePossibleEffects(IncludePossible), HasSideEffects(false) { }
2822 bool hasSideEffects() const { return HasSideEffects; }
2824 void VisitExpr(const Expr *E) {
2825 if (!HasSideEffects &&
2826 E->HasSideEffects(Context, IncludePossibleEffects))
2827 HasSideEffects = true;
2832 bool Expr::HasSideEffects(const ASTContext &Ctx,
2833 bool IncludePossibleEffects) const {
2834 // In circumstances where we care about definite side effects instead of
2835 // potential side effects, we want to ignore expressions that are part of a
2836 // macro expansion as a potential side effect.
2837 if (!IncludePossibleEffects && getExprLoc().isMacroID())
2840 if (isInstantiationDependent())
2841 return IncludePossibleEffects;
2843 switch (getStmtClass()) {
2845 #define ABSTRACT_STMT(Type)
2846 #define STMT(Type, Base) case Type##Class:
2847 #define EXPR(Type, Base)
2848 #include "clang/AST/StmtNodes.inc"
2849 llvm_unreachable("unexpected Expr kind");
2851 case DependentScopeDeclRefExprClass:
2852 case CXXUnresolvedConstructExprClass:
2853 case CXXDependentScopeMemberExprClass:
2854 case UnresolvedLookupExprClass:
2855 case UnresolvedMemberExprClass:
2856 case PackExpansionExprClass:
2857 case SubstNonTypeTemplateParmPackExprClass:
2858 case FunctionParmPackExprClass:
2860 case CXXFoldExprClass:
2861 llvm_unreachable("shouldn't see dependent / unresolved nodes here");
2863 case DeclRefExprClass:
2864 case ObjCIvarRefExprClass:
2865 case PredefinedExprClass:
2866 case IntegerLiteralClass:
2867 case FloatingLiteralClass:
2868 case ImaginaryLiteralClass:
2869 case StringLiteralClass:
2870 case CharacterLiteralClass:
2871 case OffsetOfExprClass:
2872 case ImplicitValueInitExprClass:
2873 case UnaryExprOrTypeTraitExprClass:
2874 case AddrLabelExprClass:
2875 case GNUNullExprClass:
2876 case NoInitExprClass:
2877 case CXXBoolLiteralExprClass:
2878 case CXXNullPtrLiteralExprClass:
2879 case CXXThisExprClass:
2880 case CXXScalarValueInitExprClass:
2881 case TypeTraitExprClass:
2882 case ArrayTypeTraitExprClass:
2883 case ExpressionTraitExprClass:
2884 case CXXNoexceptExprClass:
2885 case SizeOfPackExprClass:
2886 case ObjCStringLiteralClass:
2887 case ObjCEncodeExprClass:
2888 case ObjCBoolLiteralExprClass:
2889 case ObjCAvailabilityCheckExprClass:
2890 case CXXUuidofExprClass:
2891 case OpaqueValueExprClass:
2892 // These never have a side-effect.
2896 case CXXOperatorCallExprClass:
2897 case CXXMemberCallExprClass:
2898 case CUDAKernelCallExprClass:
2899 case UserDefinedLiteralClass: {
2900 // We don't know a call definitely has side effects, except for calls
2901 // to pure/const functions that definitely don't.
2902 // If the call itself is considered side-effect free, check the operands.
2903 const Decl *FD = cast<CallExpr>(this)->getCalleeDecl();
2904 bool IsPure = FD && (FD->hasAttr<ConstAttr>() || FD->hasAttr<PureAttr>());
2905 if (IsPure || !IncludePossibleEffects)
2910 case BlockExprClass:
2911 case CXXBindTemporaryExprClass:
2912 if (!IncludePossibleEffects)
2916 case MSPropertyRefExprClass:
2917 case MSPropertySubscriptExprClass:
2918 case CompoundAssignOperatorClass:
2919 case VAArgExprClass:
2920 case AtomicExprClass:
2921 case CXXThrowExprClass:
2922 case CXXNewExprClass:
2923 case CXXDeleteExprClass:
2924 case CoawaitExprClass:
2925 case CoyieldExprClass:
2926 // These always have a side-effect.
2929 case StmtExprClass: {
2930 // StmtExprs have a side-effect if any substatement does.
2931 SideEffectFinder Finder(Ctx, IncludePossibleEffects);
2932 Finder.Visit(cast<StmtExpr>(this)->getSubStmt());
2933 return Finder.hasSideEffects();
2936 case ExprWithCleanupsClass:
2937 if (IncludePossibleEffects)
2938 if (cast<ExprWithCleanups>(this)->cleanupsHaveSideEffects())
2942 case ParenExprClass:
2943 case ArraySubscriptExprClass:
2944 case OMPArraySectionExprClass:
2945 case MemberExprClass:
2946 case ConditionalOperatorClass:
2947 case BinaryConditionalOperatorClass:
2948 case CompoundLiteralExprClass:
2949 case ExtVectorElementExprClass:
2950 case DesignatedInitExprClass:
2951 case DesignatedInitUpdateExprClass:
2952 case ParenListExprClass:
2953 case CXXPseudoDestructorExprClass:
2954 case CXXStdInitializerListExprClass:
2955 case SubstNonTypeTemplateParmExprClass:
2956 case MaterializeTemporaryExprClass:
2957 case ShuffleVectorExprClass:
2958 case ConvertVectorExprClass:
2959 case AsTypeExprClass:
2960 // These have a side-effect if any subexpression does.
2963 case UnaryOperatorClass:
2964 if (cast<UnaryOperator>(this)->isIncrementDecrementOp())
2968 case BinaryOperatorClass:
2969 if (cast<BinaryOperator>(this)->isAssignmentOp())
2973 case InitListExprClass:
2974 // FIXME: The children for an InitListExpr doesn't include the array filler.
2975 if (const Expr *E = cast<InitListExpr>(this)->getArrayFiller())
2976 if (E->HasSideEffects(Ctx, IncludePossibleEffects))
2980 case GenericSelectionExprClass:
2981 return cast<GenericSelectionExpr>(this)->getResultExpr()->
2982 HasSideEffects(Ctx, IncludePossibleEffects);
2984 case ChooseExprClass:
2985 return cast<ChooseExpr>(this)->getChosenSubExpr()->HasSideEffects(
2986 Ctx, IncludePossibleEffects);
2988 case CXXDefaultArgExprClass:
2989 return cast<CXXDefaultArgExpr>(this)->getExpr()->HasSideEffects(
2990 Ctx, IncludePossibleEffects);
2992 case CXXDefaultInitExprClass: {
2993 const FieldDecl *FD = cast<CXXDefaultInitExpr>(this)->getField();
2994 if (const Expr *E = FD->getInClassInitializer())
2995 return E->HasSideEffects(Ctx, IncludePossibleEffects);
2996 // If we've not yet parsed the initializer, assume it has side-effects.
3000 case CXXDynamicCastExprClass: {
3001 // A dynamic_cast expression has side-effects if it can throw.
3002 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(this);
3003 if (DCE->getTypeAsWritten()->isReferenceType() &&
3004 DCE->getCastKind() == CK_Dynamic)
3007 case ImplicitCastExprClass:
3008 case CStyleCastExprClass:
3009 case CXXStaticCastExprClass:
3010 case CXXReinterpretCastExprClass:
3011 case CXXConstCastExprClass:
3012 case CXXFunctionalCastExprClass: {
3013 // While volatile reads are side-effecting in both C and C++, we treat them
3014 // as having possible (not definite) side-effects. This allows idiomatic
3015 // code to behave without warning, such as sizeof(*v) for a volatile-
3016 // qualified pointer.
3017 if (!IncludePossibleEffects)
3020 const CastExpr *CE = cast<CastExpr>(this);
3021 if (CE->getCastKind() == CK_LValueToRValue &&
3022 CE->getSubExpr()->getType().isVolatileQualified())
3027 case CXXTypeidExprClass:
3028 // typeid might throw if its subexpression is potentially-evaluated, so has
3029 // side-effects in that case whether or not its subexpression does.
3030 return cast<CXXTypeidExpr>(this)->isPotentiallyEvaluated();
3032 case CXXConstructExprClass:
3033 case CXXTemporaryObjectExprClass: {
3034 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this);
3035 if (!CE->getConstructor()->isTrivial() && IncludePossibleEffects)
3037 // A trivial constructor does not add any side-effects of its own. Just look
3038 // at its arguments.
3042 case CXXInheritedCtorInitExprClass: {
3043 const auto *ICIE = cast<CXXInheritedCtorInitExpr>(this);
3044 if (!ICIE->getConstructor()->isTrivial() && IncludePossibleEffects)
3049 case LambdaExprClass: {
3050 const LambdaExpr *LE = cast<LambdaExpr>(this);
3051 for (LambdaExpr::capture_iterator I = LE->capture_begin(),
3052 E = LE->capture_end(); I != E; ++I)
3053 if (I->getCaptureKind() == LCK_ByCopy)
3054 // FIXME: Only has a side-effect if the variable is volatile or if
3055 // the copy would invoke a non-trivial copy constructor.
3060 case PseudoObjectExprClass: {
3061 // Only look for side-effects in the semantic form, and look past
3062 // OpaqueValueExpr bindings in that form.
3063 const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this);
3064 for (PseudoObjectExpr::const_semantics_iterator I = PO->semantics_begin(),
3065 E = PO->semantics_end();
3067 const Expr *Subexpr = *I;
3068 if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Subexpr))
3069 Subexpr = OVE->getSourceExpr();
3070 if (Subexpr->HasSideEffects(Ctx, IncludePossibleEffects))
3076 case ObjCBoxedExprClass:
3077 case ObjCArrayLiteralClass:
3078 case ObjCDictionaryLiteralClass:
3079 case ObjCSelectorExprClass:
3080 case ObjCProtocolExprClass:
3081 case ObjCIsaExprClass:
3082 case ObjCIndirectCopyRestoreExprClass:
3083 case ObjCSubscriptRefExprClass:
3084 case ObjCBridgedCastExprClass:
3085 case ObjCMessageExprClass:
3086 case ObjCPropertyRefExprClass:
3087 // FIXME: Classify these cases better.
3088 if (IncludePossibleEffects)
3093 // Recurse to children.
3094 for (const Stmt *SubStmt : children())
3096 cast<Expr>(SubStmt)->HasSideEffects(Ctx, IncludePossibleEffects))
3103 /// \brief Look for a call to a non-trivial function within an expression.
3104 class NonTrivialCallFinder : public ConstEvaluatedExprVisitor<NonTrivialCallFinder>
3106 typedef ConstEvaluatedExprVisitor<NonTrivialCallFinder> Inherited;
3111 explicit NonTrivialCallFinder(const ASTContext &Context)
3112 : Inherited(Context), NonTrivial(false) { }
3114 bool hasNonTrivialCall() const { return NonTrivial; }
3116 void VisitCallExpr(const CallExpr *E) {
3117 if (const CXXMethodDecl *Method
3118 = dyn_cast_or_null<const CXXMethodDecl>(E->getCalleeDecl())) {
3119 if (Method->isTrivial()) {
3120 // Recurse to children of the call.
3121 Inherited::VisitStmt(E);
3129 void VisitCXXConstructExpr(const CXXConstructExpr *E) {
3130 if (E->getConstructor()->isTrivial()) {
3131 // Recurse to children of the call.
3132 Inherited::VisitStmt(E);
3139 void VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) {
3140 if (E->getTemporary()->getDestructor()->isTrivial()) {
3141 Inherited::VisitStmt(E);
3150 bool Expr::hasNonTrivialCall(const ASTContext &Ctx) const {
3151 NonTrivialCallFinder Finder(Ctx);
3153 return Finder.hasNonTrivialCall();
3156 /// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null
3157 /// pointer constant or not, as well as the specific kind of constant detected.
3158 /// Null pointer constants can be integer constant expressions with the
3159 /// value zero, casts of zero to void*, nullptr (C++0X), or __null
3160 /// (a GNU extension).
3161 Expr::NullPointerConstantKind
3162 Expr::isNullPointerConstant(ASTContext &Ctx,
3163 NullPointerConstantValueDependence NPC) const {
3164 if (isValueDependent() &&
3165 (!Ctx.getLangOpts().CPlusPlus11 || Ctx.getLangOpts().MSVCCompat)) {
3167 case NPC_NeverValueDependent:
3168 llvm_unreachable("Unexpected value dependent expression!");
3169 case NPC_ValueDependentIsNull:
3170 if (isTypeDependent() || getType()->isIntegralType(Ctx))
3171 return NPCK_ZeroExpression;
3173 return NPCK_NotNull;
3175 case NPC_ValueDependentIsNotNull:
3176 return NPCK_NotNull;
3180 // Strip off a cast to void*, if it exists. Except in C++.
3181 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) {
3182 if (!Ctx.getLangOpts().CPlusPlus) {
3183 // Check that it is a cast to void*.
3184 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
3185 QualType Pointee = PT->getPointeeType();
3186 Qualifiers Q = Pointee.getQualifiers();
3187 // In OpenCL v2.0 generic address space acts as a placeholder
3188 // and should be ignored.
3189 bool IsASValid = true;
3190 if (Ctx.getLangOpts().OpenCLVersion >= 200) {
3191 if (Pointee.getAddressSpace() == LangAS::opencl_generic)
3192 Q.removeAddressSpace();
3197 if (IsASValid && !Q.hasQualifiers() &&
3198 Pointee->isVoidType() && // to void*
3199 CE->getSubExpr()->getType()->isIntegerType()) // from int.
3200 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
3203 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) {
3204 // Ignore the ImplicitCastExpr type entirely.
3205 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
3206 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) {
3207 // Accept ((void*)0) as a null pointer constant, as many other
3208 // implementations do.
3209 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
3210 } else if (const GenericSelectionExpr *GE =
3211 dyn_cast<GenericSelectionExpr>(this)) {
3212 if (GE->isResultDependent())
3213 return NPCK_NotNull;
3214 return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC);
3215 } else if (const ChooseExpr *CE = dyn_cast<ChooseExpr>(this)) {
3216 if (CE->isConditionDependent())
3217 return NPCK_NotNull;
3218 return CE->getChosenSubExpr()->isNullPointerConstant(Ctx, NPC);
3219 } else if (const CXXDefaultArgExpr *DefaultArg
3220 = dyn_cast<CXXDefaultArgExpr>(this)) {
3221 // See through default argument expressions.
3222 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
3223 } else if (const CXXDefaultInitExpr *DefaultInit
3224 = dyn_cast<CXXDefaultInitExpr>(this)) {
3225 // See through default initializer expressions.
3226 return DefaultInit->getExpr()->isNullPointerConstant(Ctx, NPC);
3227 } else if (isa<GNUNullExpr>(this)) {
3228 // The GNU __null extension is always a null pointer constant.
3229 return NPCK_GNUNull;
3230 } else if (const MaterializeTemporaryExpr *M
3231 = dyn_cast<MaterializeTemporaryExpr>(this)) {
3232 return M->GetTemporaryExpr()->isNullPointerConstant(Ctx, NPC);
3233 } else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(this)) {
3234 if (const Expr *Source = OVE->getSourceExpr())
3235 return Source->isNullPointerConstant(Ctx, NPC);
3238 // C++11 nullptr_t is always a null pointer constant.
3239 if (getType()->isNullPtrType())
3240 return NPCK_CXX11_nullptr;
3242 if (const RecordType *UT = getType()->getAsUnionType())
3243 if (!Ctx.getLangOpts().CPlusPlus11 &&
3244 UT && UT->getDecl()->hasAttr<TransparentUnionAttr>())
3245 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){
3246 const Expr *InitExpr = CLE->getInitializer();
3247 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr))
3248 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC);
3250 // This expression must be an integer type.
3251 if (!getType()->isIntegerType() ||
3252 (Ctx.getLangOpts().CPlusPlus && getType()->isEnumeralType()))
3253 return NPCK_NotNull;
3255 if (Ctx.getLangOpts().CPlusPlus11) {
3256 // C++11 [conv.ptr]p1: A null pointer constant is an integer literal with
3257 // value zero or a prvalue of type std::nullptr_t.
3258 // Microsoft mode permits C++98 rules reflecting MSVC behavior.
3259 const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(this);
3260 if (Lit && !Lit->getValue())
3261 return NPCK_ZeroLiteral;
3262 else if (!Ctx.getLangOpts().MSVCCompat || !isCXX98IntegralConstantExpr(Ctx))
3263 return NPCK_NotNull;
3265 // If we have an integer constant expression, we need to *evaluate* it and
3266 // test for the value 0.
3267 if (!isIntegerConstantExpr(Ctx))
3268 return NPCK_NotNull;
3271 if (EvaluateKnownConstInt(Ctx) != 0)
3272 return NPCK_NotNull;
3274 if (isa<IntegerLiteral>(this))
3275 return NPCK_ZeroLiteral;
3276 return NPCK_ZeroExpression;
3279 /// \brief If this expression is an l-value for an Objective C
3280 /// property, find the underlying property reference expression.
3281 const ObjCPropertyRefExpr *Expr::getObjCProperty() const {
3282 const Expr *E = this;
3284 assert((E->getValueKind() == VK_LValue &&
3285 E->getObjectKind() == OK_ObjCProperty) &&
3286 "expression is not a property reference");
3287 E = E->IgnoreParenCasts();
3288 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
3289 if (BO->getOpcode() == BO_Comma) {
3298 return cast<ObjCPropertyRefExpr>(E);
3301 bool Expr::isObjCSelfExpr() const {
3302 const Expr *E = IgnoreParenImpCasts();
3304 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
3308 const ImplicitParamDecl *Param = dyn_cast<ImplicitParamDecl>(DRE->getDecl());
3312 const ObjCMethodDecl *M = dyn_cast<ObjCMethodDecl>(Param->getDeclContext());
3316 return M->getSelfDecl() == Param;
3319 FieldDecl *Expr::getSourceBitField() {
3320 Expr *E = this->IgnoreParens();
3322 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
3323 if (ICE->getCastKind() == CK_LValueToRValue ||
3324 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp))
3325 E = ICE->getSubExpr()->IgnoreParens();
3330 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E))
3331 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl()))
3332 if (Field->isBitField())
3335 if (ObjCIvarRefExpr *IvarRef = dyn_cast<ObjCIvarRefExpr>(E))
3336 if (FieldDecl *Ivar = dyn_cast<FieldDecl>(IvarRef->getDecl()))
3337 if (Ivar->isBitField())
3340 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) {
3341 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl()))
3342 if (Field->isBitField())
3345 if (BindingDecl *BD = dyn_cast<BindingDecl>(DeclRef->getDecl()))
3346 if (Expr *E = BD->getBinding())
3347 return E->getSourceBitField();
3350 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) {
3351 if (BinOp->isAssignmentOp() && BinOp->getLHS())
3352 return BinOp->getLHS()->getSourceBitField();
3354 if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS())
3355 return BinOp->getRHS()->getSourceBitField();
3358 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(E))
3359 if (UnOp->isPrefix() && UnOp->isIncrementDecrementOp())
3360 return UnOp->getSubExpr()->getSourceBitField();
3365 bool Expr::refersToVectorElement() const {
3366 // FIXME: Why do we not just look at the ObjectKind here?
3367 const Expr *E = this->IgnoreParens();
3369 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
3370 if (ICE->getValueKind() != VK_RValue &&
3371 ICE->getCastKind() == CK_NoOp)
3372 E = ICE->getSubExpr()->IgnoreParens();
3377 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E))
3378 return ASE->getBase()->getType()->isVectorType();
3380 if (isa<ExtVectorElementExpr>(E))
3383 if (auto *DRE = dyn_cast<DeclRefExpr>(E))
3384 if (auto *BD = dyn_cast<BindingDecl>(DRE->getDecl()))
3385 if (auto *E = BD->getBinding())
3386 return E->refersToVectorElement();
3391 bool Expr::refersToGlobalRegisterVar() const {
3392 const Expr *E = this->IgnoreParenImpCasts();
3394 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
3395 if (const auto *VD = dyn_cast<VarDecl>(DRE->getDecl()))
3396 if (VD->getStorageClass() == SC_Register &&
3397 VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
3403 /// isArrow - Return true if the base expression is a pointer to vector,
3404 /// return false if the base expression is a vector.
3405 bool ExtVectorElementExpr::isArrow() const {
3406 return getBase()->getType()->isPointerType();
3409 unsigned ExtVectorElementExpr::getNumElements() const {
3410 if (const VectorType *VT = getType()->getAs<VectorType>())
3411 return VT->getNumElements();
3415 /// containsDuplicateElements - Return true if any element access is repeated.
3416 bool ExtVectorElementExpr::containsDuplicateElements() const {
3417 // FIXME: Refactor this code to an accessor on the AST node which returns the
3418 // "type" of component access, and share with code below and in Sema.
3419 StringRef Comp = Accessor->getName();
3421 // Halving swizzles do not contain duplicate elements.
3422 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
3425 // Advance past s-char prefix on hex swizzles.
3426 if (Comp[0] == 's' || Comp[0] == 'S')
3427 Comp = Comp.substr(1);
3429 for (unsigned i = 0, e = Comp.size(); i != e; ++i)
3430 if (Comp.substr(i + 1).find(Comp[i]) != StringRef::npos)
3436 /// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
3437 void ExtVectorElementExpr::getEncodedElementAccess(
3438 SmallVectorImpl<uint32_t> &Elts) const {
3439 StringRef Comp = Accessor->getName();
3440 bool isNumericAccessor = false;
3441 if (Comp[0] == 's' || Comp[0] == 'S') {
3442 Comp = Comp.substr(1);
3443 isNumericAccessor = true;
3446 bool isHi = Comp == "hi";
3447 bool isLo = Comp == "lo";
3448 bool isEven = Comp == "even";
3449 bool isOdd = Comp == "odd";
3451 for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
3463 Index = ExtVectorType::getAccessorIdx(Comp[i], isNumericAccessor);
3465 Elts.push_back(Index);
3469 ShuffleVectorExpr::ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr*> args,
3470 QualType Type, SourceLocation BLoc,
3472 : Expr(ShuffleVectorExprClass, Type, VK_RValue, OK_Ordinary,
3473 Type->isDependentType(), Type->isDependentType(),
3474 Type->isInstantiationDependentType(),
3475 Type->containsUnexpandedParameterPack()),
3476 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(args.size())
3478 SubExprs = new (C) Stmt*[args.size()];
3479 for (unsigned i = 0; i != args.size(); i++) {
3480 if (args[i]->isTypeDependent())
3481 ExprBits.TypeDependent = true;
3482 if (args[i]->isValueDependent())
3483 ExprBits.ValueDependent = true;
3484 if (args[i]->isInstantiationDependent())
3485 ExprBits.InstantiationDependent = true;
3486 if (args[i]->containsUnexpandedParameterPack())
3487 ExprBits.ContainsUnexpandedParameterPack = true;
3489 SubExprs[i] = args[i];
3493 void ShuffleVectorExpr::setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs) {
3494 if (SubExprs) C.Deallocate(SubExprs);
3496 this->NumExprs = Exprs.size();
3497 SubExprs = new (C) Stmt*[NumExprs];
3498 memcpy(SubExprs, Exprs.data(), sizeof(Expr *) * Exprs.size());
3501 GenericSelectionExpr::GenericSelectionExpr(const ASTContext &Context,
3502 SourceLocation GenericLoc, Expr *ControllingExpr,
3503 ArrayRef<TypeSourceInfo*> AssocTypes,
3504 ArrayRef<Expr*> AssocExprs,
3505 SourceLocation DefaultLoc,
3506 SourceLocation RParenLoc,
3507 bool ContainsUnexpandedParameterPack,
3508 unsigned ResultIndex)
3509 : Expr(GenericSelectionExprClass,
3510 AssocExprs[ResultIndex]->getType(),
3511 AssocExprs[ResultIndex]->getValueKind(),
3512 AssocExprs[ResultIndex]->getObjectKind(),
3513 AssocExprs[ResultIndex]->isTypeDependent(),
3514 AssocExprs[ResultIndex]->isValueDependent(),
3515 AssocExprs[ResultIndex]->isInstantiationDependent(),
3516 ContainsUnexpandedParameterPack),
3517 AssocTypes(new (Context) TypeSourceInfo*[AssocTypes.size()]),
3518 SubExprs(new (Context) Stmt*[END_EXPR+AssocExprs.size()]),
3519 NumAssocs(AssocExprs.size()), ResultIndex(ResultIndex),
3520 GenericLoc(GenericLoc), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
3521 SubExprs[CONTROLLING] = ControllingExpr;
3522 assert(AssocTypes.size() == AssocExprs.size());
3523 std::copy(AssocTypes.begin(), AssocTypes.end(), this->AssocTypes);
3524 std::copy(AssocExprs.begin(), AssocExprs.end(), SubExprs+END_EXPR);
3527 GenericSelectionExpr::GenericSelectionExpr(const ASTContext &Context,
3528 SourceLocation GenericLoc, Expr *ControllingExpr,
3529 ArrayRef<TypeSourceInfo*> AssocTypes,
3530 ArrayRef<Expr*> AssocExprs,
3531 SourceLocation DefaultLoc,
3532 SourceLocation RParenLoc,
3533 bool ContainsUnexpandedParameterPack)
3534 : Expr(GenericSelectionExprClass,
3535 Context.DependentTy,
3538 /*isTypeDependent=*/true,
3539 /*isValueDependent=*/true,
3540 /*isInstantiationDependent=*/true,
3541 ContainsUnexpandedParameterPack),
3542 AssocTypes(new (Context) TypeSourceInfo*[AssocTypes.size()]),
3543 SubExprs(new (Context) Stmt*[END_EXPR+AssocExprs.size()]),
3544 NumAssocs(AssocExprs.size()), ResultIndex(-1U), GenericLoc(GenericLoc),
3545 DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
3546 SubExprs[CONTROLLING] = ControllingExpr;
3547 assert(AssocTypes.size() == AssocExprs.size());
3548 std::copy(AssocTypes.begin(), AssocTypes.end(), this->AssocTypes);
3549 std::copy(AssocExprs.begin(), AssocExprs.end(), SubExprs+END_EXPR);
3552 //===----------------------------------------------------------------------===//
3553 // DesignatedInitExpr
3554 //===----------------------------------------------------------------------===//
3556 IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const {
3557 assert(Kind == FieldDesignator && "Only valid on a field designator");
3558 if (Field.NameOrField & 0x01)
3559 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01);
3561 return getField()->getIdentifier();
3564 DesignatedInitExpr::DesignatedInitExpr(const ASTContext &C, QualType Ty,
3565 llvm::ArrayRef<Designator> Designators,
3566 SourceLocation EqualOrColonLoc,
3568 ArrayRef<Expr*> IndexExprs,
3570 : Expr(DesignatedInitExprClass, Ty,
3571 Init->getValueKind(), Init->getObjectKind(),
3572 Init->isTypeDependent(), Init->isValueDependent(),
3573 Init->isInstantiationDependent(),
3574 Init->containsUnexpandedParameterPack()),
3575 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
3576 NumDesignators(Designators.size()), NumSubExprs(IndexExprs.size() + 1) {
3577 this->Designators = new (C) Designator[NumDesignators];
3579 // Record the initializer itself.
3580 child_iterator Child = child_begin();
3583 // Copy the designators and their subexpressions, computing
3584 // value-dependence along the way.
3585 unsigned IndexIdx = 0;
3586 for (unsigned I = 0; I != NumDesignators; ++I) {
3587 this->Designators[I] = Designators[I];
3589 if (this->Designators[I].isArrayDesignator()) {
3590 // Compute type- and value-dependence.
3591 Expr *Index = IndexExprs[IndexIdx];
3592 if (Index->isTypeDependent() || Index->isValueDependent())
3593 ExprBits.TypeDependent = ExprBits.ValueDependent = true;
3594 if (Index->isInstantiationDependent())
3595 ExprBits.InstantiationDependent = true;
3596 // Propagate unexpanded parameter packs.
3597 if (Index->containsUnexpandedParameterPack())
3598 ExprBits.ContainsUnexpandedParameterPack = true;
3600 // Copy the index expressions into permanent storage.
3601 *Child++ = IndexExprs[IndexIdx++];
3602 } else if (this->Designators[I].isArrayRangeDesignator()) {
3603 // Compute type- and value-dependence.
3604 Expr *Start = IndexExprs[IndexIdx];
3605 Expr *End = IndexExprs[IndexIdx + 1];
3606 if (Start->isTypeDependent() || Start->isValueDependent() ||
3607 End->isTypeDependent() || End->isValueDependent()) {
3608 ExprBits.TypeDependent = ExprBits.ValueDependent = true;
3609 ExprBits.InstantiationDependent = true;
3610 } else if (Start->isInstantiationDependent() ||
3611 End->isInstantiationDependent()) {
3612 ExprBits.InstantiationDependent = true;
3615 // Propagate unexpanded parameter packs.
3616 if (Start->containsUnexpandedParameterPack() ||
3617 End->containsUnexpandedParameterPack())
3618 ExprBits.ContainsUnexpandedParameterPack = true;
3620 // Copy the start/end expressions into permanent storage.
3621 *Child++ = IndexExprs[IndexIdx++];
3622 *Child++ = IndexExprs[IndexIdx++];
3626 assert(IndexIdx == IndexExprs.size() && "Wrong number of index expressions");
3629 DesignatedInitExpr *
3630 DesignatedInitExpr::Create(const ASTContext &C,
3631 llvm::ArrayRef<Designator> Designators,
3632 ArrayRef<Expr*> IndexExprs,
3633 SourceLocation ColonOrEqualLoc,
3634 bool UsesColonSyntax, Expr *Init) {
3635 void *Mem = C.Allocate(totalSizeToAlloc<Stmt *>(IndexExprs.size() + 1),
3636 alignof(DesignatedInitExpr));
3637 return new (Mem) DesignatedInitExpr(C, C.VoidTy, Designators,
3638 ColonOrEqualLoc, UsesColonSyntax,
3642 DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(const ASTContext &C,
3643 unsigned NumIndexExprs) {
3644 void *Mem = C.Allocate(totalSizeToAlloc<Stmt *>(NumIndexExprs + 1),
3645 alignof(DesignatedInitExpr));
3646 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
3649 void DesignatedInitExpr::setDesignators(const ASTContext &C,
3650 const Designator *Desigs,
3651 unsigned NumDesigs) {
3652 Designators = new (C) Designator[NumDesigs];
3653 NumDesignators = NumDesigs;
3654 for (unsigned I = 0; I != NumDesigs; ++I)
3655 Designators[I] = Desigs[I];
3658 SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const {
3659 DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this);
3661 return DIE->getDesignator(0)->getSourceRange();
3662 return SourceRange(DIE->getDesignator(0)->getLocStart(),
3663 DIE->getDesignator(size()-1)->getLocEnd());
3666 SourceLocation DesignatedInitExpr::getLocStart() const {
3667 SourceLocation StartLoc;
3668 auto *DIE = const_cast<DesignatedInitExpr *>(this);
3669 Designator &First = *DIE->getDesignator(0);
3670 if (First.isFieldDesignator()) {
3672 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc);
3674 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc);
3677 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc);
3681 SourceLocation DesignatedInitExpr::getLocEnd() const {
3682 return getInit()->getLocEnd();
3685 Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) const {
3686 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator");
3687 return getSubExpr(D.ArrayOrRange.Index + 1);
3690 Expr *DesignatedInitExpr::getArrayRangeStart(const Designator &D) const {
3691 assert(D.Kind == Designator::ArrayRangeDesignator &&
3692 "Requires array range designator");
3693 return getSubExpr(D.ArrayOrRange.Index + 1);
3696 Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator &D) const {
3697 assert(D.Kind == Designator::ArrayRangeDesignator &&
3698 "Requires array range designator");
3699 return getSubExpr(D.ArrayOrRange.Index + 2);
3702 /// \brief Replaces the designator at index @p Idx with the series
3703 /// of designators in [First, Last).
3704 void DesignatedInitExpr::ExpandDesignator(const ASTContext &C, unsigned Idx,
3705 const Designator *First,
3706 const Designator *Last) {
3707 unsigned NumNewDesignators = Last - First;
3708 if (NumNewDesignators == 0) {
3709 std::copy_backward(Designators + Idx + 1,
3710 Designators + NumDesignators,
3712 --NumNewDesignators;
3714 } else if (NumNewDesignators == 1) {
3715 Designators[Idx] = *First;
3719 Designator *NewDesignators
3720 = new (C) Designator[NumDesignators - 1 + NumNewDesignators];
3721 std::copy(Designators, Designators + Idx, NewDesignators);
3722 std::copy(First, Last, NewDesignators + Idx);
3723 std::copy(Designators + Idx + 1, Designators + NumDesignators,
3724 NewDesignators + Idx + NumNewDesignators);
3725 Designators = NewDesignators;
3726 NumDesignators = NumDesignators - 1 + NumNewDesignators;
3729 DesignatedInitUpdateExpr::DesignatedInitUpdateExpr(const ASTContext &C,
3730 SourceLocation lBraceLoc, Expr *baseExpr, SourceLocation rBraceLoc)
3731 : Expr(DesignatedInitUpdateExprClass, baseExpr->getType(), VK_RValue,
3732 OK_Ordinary, false, false, false, false) {
3733 BaseAndUpdaterExprs[0] = baseExpr;
3735 InitListExpr *ILE = new (C) InitListExpr(C, lBraceLoc, None, rBraceLoc);
3736 ILE->setType(baseExpr->getType());
3737 BaseAndUpdaterExprs[1] = ILE;
3740 SourceLocation DesignatedInitUpdateExpr::getLocStart() const {
3741 return getBase()->getLocStart();
3744 SourceLocation DesignatedInitUpdateExpr::getLocEnd() const {
3745 return getBase()->getLocEnd();
3748 ParenListExpr::ParenListExpr(const ASTContext& C, SourceLocation lparenloc,
3749 ArrayRef<Expr*> exprs,
3750 SourceLocation rparenloc)
3751 : Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary,
3752 false, false, false, false),
3753 NumExprs(exprs.size()), LParenLoc(lparenloc), RParenLoc(rparenloc) {
3754 Exprs = new (C) Stmt*[exprs.size()];
3755 for (unsigned i = 0; i != exprs.size(); ++i) {
3756 if (exprs[i]->isTypeDependent())
3757 ExprBits.TypeDependent = true;
3758 if (exprs[i]->isValueDependent())
3759 ExprBits.ValueDependent = true;
3760 if (exprs[i]->isInstantiationDependent())
3761 ExprBits.InstantiationDependent = true;
3762 if (exprs[i]->containsUnexpandedParameterPack())
3763 ExprBits.ContainsUnexpandedParameterPack = true;
3765 Exprs[i] = exprs[i];
3769 const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) {
3770 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(e))
3771 e = ewc->getSubExpr();
3772 if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(e))
3773 e = m->GetTemporaryExpr();
3774 e = cast<CXXConstructExpr>(e)->getArg(0);
3775 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
3776 e = ice->getSubExpr();
3777 return cast<OpaqueValueExpr>(e);
3780 PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &Context,
3782 unsigned numSemanticExprs) {
3784 Context.Allocate(totalSizeToAlloc<Expr *>(1 + numSemanticExprs),
3785 alignof(PseudoObjectExpr));
3786 return new(buffer) PseudoObjectExpr(sh, numSemanticExprs);
3789 PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs)
3790 : Expr(PseudoObjectExprClass, shell) {
3791 PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1;
3794 PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &C, Expr *syntax,
3795 ArrayRef<Expr*> semantics,
3796 unsigned resultIndex) {
3797 assert(syntax && "no syntactic expression!");
3798 assert(semantics.size() && "no semantic expressions!");
3802 if (resultIndex == NoResult) {
3806 assert(resultIndex < semantics.size());
3807 type = semantics[resultIndex]->getType();
3808 VK = semantics[resultIndex]->getValueKind();
3809 assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary);
3812 void *buffer = C.Allocate(totalSizeToAlloc<Expr *>(semantics.size() + 1),
3813 alignof(PseudoObjectExpr));
3814 return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics,
3818 PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK,
3819 Expr *syntax, ArrayRef<Expr*> semantics,
3820 unsigned resultIndex)
3821 : Expr(PseudoObjectExprClass, type, VK, OK_Ordinary,
3822 /*filled in at end of ctor*/ false, false, false, false) {
3823 PseudoObjectExprBits.NumSubExprs = semantics.size() + 1;
3824 PseudoObjectExprBits.ResultIndex = resultIndex + 1;
3826 for (unsigned i = 0, e = semantics.size() + 1; i != e; ++i) {
3827 Expr *E = (i == 0 ? syntax : semantics[i-1]);
3828 getSubExprsBuffer()[i] = E;
3830 if (E->isTypeDependent())
3831 ExprBits.TypeDependent = true;
3832 if (E->isValueDependent())
3833 ExprBits.ValueDependent = true;
3834 if (E->isInstantiationDependent())
3835 ExprBits.InstantiationDependent = true;
3836 if (E->containsUnexpandedParameterPack())
3837 ExprBits.ContainsUnexpandedParameterPack = true;
3839 if (isa<OpaqueValueExpr>(E))
3840 assert(cast<OpaqueValueExpr>(E)->getSourceExpr() != nullptr &&
3841 "opaque-value semantic expressions for pseudo-object "
3842 "operations must have sources");
3846 //===----------------------------------------------------------------------===//
3847 // Child Iterators for iterating over subexpressions/substatements
3848 //===----------------------------------------------------------------------===//
3850 // UnaryExprOrTypeTraitExpr
3851 Stmt::child_range UnaryExprOrTypeTraitExpr::children() {
3852 // If this is of a type and the type is a VLA type (and not a typedef), the
3853 // size expression of the VLA needs to be treated as an executable expression.
3854 // Why isn't this weirdness documented better in StmtIterator?
3855 if (isArgumentType()) {
3856 if (const VariableArrayType* T = dyn_cast<VariableArrayType>(
3857 getArgumentType().getTypePtr()))
3858 return child_range(child_iterator(T), child_iterator());
3859 return child_range(child_iterator(), child_iterator());
3861 return child_range(&Argument.Ex, &Argument.Ex + 1);
3864 AtomicExpr::AtomicExpr(SourceLocation BLoc, ArrayRef<Expr*> args,
3865 QualType t, AtomicOp op, SourceLocation RP)
3866 : Expr(AtomicExprClass, t, VK_RValue, OK_Ordinary,
3867 false, false, false, false),
3868 NumSubExprs(args.size()), BuiltinLoc(BLoc), RParenLoc(RP), Op(op)
3870 assert(args.size() == getNumSubExprs(op) && "wrong number of subexpressions");
3871 for (unsigned i = 0; i != args.size(); i++) {
3872 if (args[i]->isTypeDependent())
3873 ExprBits.TypeDependent = true;
3874 if (args[i]->isValueDependent())
3875 ExprBits.ValueDependent = true;
3876 if (args[i]->isInstantiationDependent())
3877 ExprBits.InstantiationDependent = true;
3878 if (args[i]->containsUnexpandedParameterPack())
3879 ExprBits.ContainsUnexpandedParameterPack = true;
3881 SubExprs[i] = args[i];
3885 unsigned AtomicExpr::getNumSubExprs(AtomicOp Op) {
3887 case AO__c11_atomic_init:
3888 case AO__c11_atomic_load:
3889 case AO__atomic_load_n:
3892 case AO__c11_atomic_store:
3893 case AO__c11_atomic_exchange:
3894 case AO__atomic_load:
3895 case AO__atomic_store:
3896 case AO__atomic_store_n:
3897 case AO__atomic_exchange_n:
3898 case AO__c11_atomic_fetch_add:
3899 case AO__c11_atomic_fetch_sub:
3900 case AO__c11_atomic_fetch_and:
3901 case AO__c11_atomic_fetch_or:
3902 case AO__c11_atomic_fetch_xor:
3903 case AO__atomic_fetch_add:
3904 case AO__atomic_fetch_sub:
3905 case AO__atomic_fetch_and:
3906 case AO__atomic_fetch_or:
3907 case AO__atomic_fetch_xor:
3908 case AO__atomic_fetch_nand:
3909 case AO__atomic_add_fetch:
3910 case AO__atomic_sub_fetch:
3911 case AO__atomic_and_fetch:
3912 case AO__atomic_or_fetch:
3913 case AO__atomic_xor_fetch:
3914 case AO__atomic_nand_fetch:
3917 case AO__atomic_exchange:
3920 case AO__c11_atomic_compare_exchange_strong:
3921 case AO__c11_atomic_compare_exchange_weak:
3924 case AO__atomic_compare_exchange:
3925 case AO__atomic_compare_exchange_n:
3928 llvm_unreachable("unknown atomic op");
3931 QualType OMPArraySectionExpr::getBaseOriginalType(const Expr *Base) {
3932 unsigned ArraySectionCount = 0;
3933 while (auto *OASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParens())) {
3934 Base = OASE->getBase();
3935 ++ArraySectionCount;
3938 dyn_cast<ArraySubscriptExpr>(Base->IgnoreParenImpCasts())) {
3939 Base = ASE->getBase();
3940 ++ArraySectionCount;
3942 Base = Base->IgnoreParenImpCasts();
3943 auto OriginalTy = Base->getType();
3944 if (auto *DRE = dyn_cast<DeclRefExpr>(Base))
3945 if (auto *PVD = dyn_cast<ParmVarDecl>(DRE->getDecl()))
3946 OriginalTy = PVD->getOriginalType().getNonReferenceType();
3948 for (unsigned Cnt = 0; Cnt < ArraySectionCount; ++Cnt) {
3949 if (OriginalTy->isAnyPointerType())
3950 OriginalTy = OriginalTy->getPointeeType();
3952 assert (OriginalTy->isArrayType());
3953 OriginalTy = OriginalTy->castAsArrayTypeUnsafe()->getElementType();