1 //===--- ExprCXX.h - Classes for representing expressions -------*- C++ -*-===//
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 //===----------------------------------------------------------------------===//
11 /// \brief Defines the clang::Expr interface and subclasses for C++ expressions.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_AST_EXPRCXX_H
16 #define LLVM_CLANG_AST_EXPRCXX_H
18 #include "clang/AST/Decl.h"
19 #include "clang/AST/Expr.h"
20 #include "clang/AST/LambdaCapture.h"
21 #include "clang/AST/TemplateBase.h"
22 #include "clang/AST/UnresolvedSet.h"
23 #include "clang/Basic/ExpressionTraits.h"
24 #include "clang/Basic/TypeTraits.h"
25 #include "llvm/Support/Compiler.h"
29 class CXXConstructorDecl;
30 class CXXDestructorDecl;
34 class TemplateArgumentListInfo;
37 //===--------------------------------------------------------------------===//
39 //===--------------------------------------------------------------------===//
41 /// \brief A call to an overloaded operator written using operator
44 /// Represents a call to an overloaded operator written using operator
45 /// syntax, e.g., "x + y" or "*p". While semantically equivalent to a
46 /// normal call, this AST node provides better information about the
47 /// syntactic representation of the call.
49 /// In a C++ template, this expression node kind will be used whenever
50 /// any of the arguments are type-dependent. In this case, the
51 /// function itself will be a (possibly empty) set of functions and
52 /// function templates that were found by name lookup at template
54 class CXXOperatorCallExpr : public CallExpr {
55 /// \brief The overloaded operator.
56 OverloadedOperatorKind Operator;
59 // Record the FP_CONTRACT state that applies to this operator call. Only
60 // meaningful for floating point types. For other types this value can be
62 unsigned FPContractable : 1;
64 SourceRange getSourceRangeImpl() const LLVM_READONLY;
66 CXXOperatorCallExpr(ASTContext& C, OverloadedOperatorKind Op, Expr *fn,
67 ArrayRef<Expr*> args, QualType t, ExprValueKind VK,
68 SourceLocation operatorloc, bool fpContractable)
69 : CallExpr(C, CXXOperatorCallExprClass, fn, 0, args, t, VK,
71 Operator(Op), FPContractable(fpContractable) {
72 Range = getSourceRangeImpl();
74 explicit CXXOperatorCallExpr(ASTContext& C, EmptyShell Empty) :
75 CallExpr(C, CXXOperatorCallExprClass, Empty) { }
78 /// \brief Returns the kind of overloaded operator that this
79 /// expression refers to.
80 OverloadedOperatorKind getOperator() const { return Operator; }
82 /// \brief Returns the location of the operator symbol in the expression.
84 /// When \c getOperator()==OO_Call, this is the location of the right
85 /// parentheses; when \c getOperator()==OO_Subscript, this is the location
86 /// of the right bracket.
87 SourceLocation getOperatorLoc() const { return getRParenLoc(); }
89 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); }
90 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); }
91 SourceRange getSourceRange() const { return Range; }
93 static bool classof(const Stmt *T) {
94 return T->getStmtClass() == CXXOperatorCallExprClass;
97 // Set the FP contractability status of this operator. Only meaningful for
98 // operations on floating point types.
99 void setFPContractable(bool FPC) { FPContractable = FPC; }
101 // Get the FP contractability status of this operator. Only meaningful for
102 // operations on floating point types.
103 bool isFPContractable() const { return FPContractable; }
105 friend class ASTStmtReader;
106 friend class ASTStmtWriter;
109 /// Represents a call to a member function that
110 /// may be written either with member call syntax (e.g., "obj.func()"
111 /// or "objptr->func()") or with normal function-call syntax
112 /// ("func()") within a member function that ends up calling a member
113 /// function. The callee in either case is a MemberExpr that contains
114 /// both the object argument and the member function, while the
115 /// arguments are the arguments within the parentheses (not including
116 /// the object argument).
117 class CXXMemberCallExpr : public CallExpr {
119 CXXMemberCallExpr(ASTContext &C, Expr *fn, ArrayRef<Expr*> args,
120 QualType t, ExprValueKind VK, SourceLocation RP)
121 : CallExpr(C, CXXMemberCallExprClass, fn, 0, args, t, VK, RP) {}
123 CXXMemberCallExpr(ASTContext &C, EmptyShell Empty)
124 : CallExpr(C, CXXMemberCallExprClass, Empty) { }
126 /// \brief Retrieves the implicit object argument for the member call.
128 /// For example, in "x.f(5)", this returns the sub-expression "x".
129 Expr *getImplicitObjectArgument() const;
131 /// \brief Retrieves the declaration of the called method.
132 CXXMethodDecl *getMethodDecl() const;
134 /// \brief Retrieves the CXXRecordDecl for the underlying type of
135 /// the implicit object argument.
137 /// Note that this is may not be the same declaration as that of the class
138 /// context of the CXXMethodDecl which this function is calling.
139 /// FIXME: Returns 0 for member pointer call exprs.
140 CXXRecordDecl *getRecordDecl() const;
142 static bool classof(const Stmt *T) {
143 return T->getStmtClass() == CXXMemberCallExprClass;
147 /// \brief Represents a call to a CUDA kernel function.
148 class CUDAKernelCallExpr : public CallExpr {
150 enum { CONFIG, END_PREARG };
153 CUDAKernelCallExpr(ASTContext &C, Expr *fn, CallExpr *Config,
154 ArrayRef<Expr*> args, QualType t, ExprValueKind VK,
156 : CallExpr(C, CUDAKernelCallExprClass, fn, END_PREARG, args, t, VK, RP) {
160 CUDAKernelCallExpr(ASTContext &C, EmptyShell Empty)
161 : CallExpr(C, CUDAKernelCallExprClass, END_PREARG, Empty) { }
163 const CallExpr *getConfig() const {
164 return cast_or_null<CallExpr>(getPreArg(CONFIG));
166 CallExpr *getConfig() { return cast_or_null<CallExpr>(getPreArg(CONFIG)); }
167 void setConfig(CallExpr *E) { setPreArg(CONFIG, E); }
169 static bool classof(const Stmt *T) {
170 return T->getStmtClass() == CUDAKernelCallExprClass;
174 /// \brief Abstract class common to all of the C++ "named"/"keyword" casts.
176 /// This abstract class is inherited by all of the classes
177 /// representing "named" casts: CXXStaticCastExpr for \c static_cast,
178 /// CXXDynamicCastExpr for \c dynamic_cast, CXXReinterpretCastExpr for
179 /// reinterpret_cast, and CXXConstCastExpr for \c const_cast.
180 class CXXNamedCastExpr : public ExplicitCastExpr {
182 SourceLocation Loc; // the location of the casting op
183 SourceLocation RParenLoc; // the location of the right parenthesis
184 SourceRange AngleBrackets; // range for '<' '>'
187 CXXNamedCastExpr(StmtClass SC, QualType ty, ExprValueKind VK,
188 CastKind kind, Expr *op, unsigned PathSize,
189 TypeSourceInfo *writtenTy, SourceLocation l,
190 SourceLocation RParenLoc,
191 SourceRange AngleBrackets)
192 : ExplicitCastExpr(SC, ty, VK, kind, op, PathSize, writtenTy), Loc(l),
193 RParenLoc(RParenLoc), AngleBrackets(AngleBrackets) {}
195 explicit CXXNamedCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize)
196 : ExplicitCastExpr(SC, Shell, PathSize) { }
198 friend class ASTStmtReader;
201 const char *getCastName() const;
203 /// \brief Retrieve the location of the cast operator keyword, e.g.,
205 SourceLocation getOperatorLoc() const { return Loc; }
207 /// \brief Retrieve the location of the closing parenthesis.
208 SourceLocation getRParenLoc() const { return RParenLoc; }
210 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
211 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
212 SourceRange getAngleBrackets() const LLVM_READONLY { return AngleBrackets; }
214 static bool classof(const Stmt *T) {
215 switch (T->getStmtClass()) {
216 case CXXStaticCastExprClass:
217 case CXXDynamicCastExprClass:
218 case CXXReinterpretCastExprClass:
219 case CXXConstCastExprClass:
227 /// \brief A C++ \c static_cast expression (C++ [expr.static.cast]).
229 /// This expression node represents a C++ static cast, e.g.,
230 /// \c static_cast<int>(1.0).
231 class CXXStaticCastExpr : public CXXNamedCastExpr {
232 CXXStaticCastExpr(QualType ty, ExprValueKind vk, CastKind kind, Expr *op,
233 unsigned pathSize, TypeSourceInfo *writtenTy,
234 SourceLocation l, SourceLocation RParenLoc,
235 SourceRange AngleBrackets)
236 : CXXNamedCastExpr(CXXStaticCastExprClass, ty, vk, kind, op, pathSize,
237 writtenTy, l, RParenLoc, AngleBrackets) {}
239 explicit CXXStaticCastExpr(EmptyShell Empty, unsigned PathSize)
240 : CXXNamedCastExpr(CXXStaticCastExprClass, Empty, PathSize) { }
243 static CXXStaticCastExpr *Create(const ASTContext &Context, QualType T,
244 ExprValueKind VK, CastKind K, Expr *Op,
245 const CXXCastPath *Path,
246 TypeSourceInfo *Written, SourceLocation L,
247 SourceLocation RParenLoc,
248 SourceRange AngleBrackets);
249 static CXXStaticCastExpr *CreateEmpty(const ASTContext &Context,
252 static bool classof(const Stmt *T) {
253 return T->getStmtClass() == CXXStaticCastExprClass;
257 /// \brief A C++ @c dynamic_cast expression (C++ [expr.dynamic.cast]).
259 /// This expression node represents a dynamic cast, e.g.,
260 /// \c dynamic_cast<Derived*>(BasePtr). Such a cast may perform a run-time
261 /// check to determine how to perform the type conversion.
262 class CXXDynamicCastExpr : public CXXNamedCastExpr {
263 CXXDynamicCastExpr(QualType ty, ExprValueKind VK, CastKind kind,
264 Expr *op, unsigned pathSize, TypeSourceInfo *writtenTy,
265 SourceLocation l, SourceLocation RParenLoc,
266 SourceRange AngleBrackets)
267 : CXXNamedCastExpr(CXXDynamicCastExprClass, ty, VK, kind, op, pathSize,
268 writtenTy, l, RParenLoc, AngleBrackets) {}
270 explicit CXXDynamicCastExpr(EmptyShell Empty, unsigned pathSize)
271 : CXXNamedCastExpr(CXXDynamicCastExprClass, Empty, pathSize) { }
274 static CXXDynamicCastExpr *Create(const ASTContext &Context, QualType T,
275 ExprValueKind VK, CastKind Kind, Expr *Op,
276 const CXXCastPath *Path,
277 TypeSourceInfo *Written, SourceLocation L,
278 SourceLocation RParenLoc,
279 SourceRange AngleBrackets);
281 static CXXDynamicCastExpr *CreateEmpty(const ASTContext &Context,
284 bool isAlwaysNull() const;
286 static bool classof(const Stmt *T) {
287 return T->getStmtClass() == CXXDynamicCastExprClass;
291 /// \brief A C++ @c reinterpret_cast expression (C++ [expr.reinterpret.cast]).
293 /// This expression node represents a reinterpret cast, e.g.,
294 /// @c reinterpret_cast<int>(VoidPtr).
296 /// A reinterpret_cast provides a differently-typed view of a value but
297 /// (in Clang, as in most C++ implementations) performs no actual work at
299 class CXXReinterpretCastExpr : public CXXNamedCastExpr {
300 CXXReinterpretCastExpr(QualType ty, ExprValueKind vk, CastKind kind,
301 Expr *op, unsigned pathSize,
302 TypeSourceInfo *writtenTy, SourceLocation l,
303 SourceLocation RParenLoc,
304 SourceRange AngleBrackets)
305 : CXXNamedCastExpr(CXXReinterpretCastExprClass, ty, vk, kind, op,
306 pathSize, writtenTy, l, RParenLoc, AngleBrackets) {}
308 CXXReinterpretCastExpr(EmptyShell Empty, unsigned pathSize)
309 : CXXNamedCastExpr(CXXReinterpretCastExprClass, Empty, pathSize) { }
312 static CXXReinterpretCastExpr *Create(const ASTContext &Context, QualType T,
313 ExprValueKind VK, CastKind Kind,
314 Expr *Op, const CXXCastPath *Path,
315 TypeSourceInfo *WrittenTy, SourceLocation L,
316 SourceLocation RParenLoc,
317 SourceRange AngleBrackets);
318 static CXXReinterpretCastExpr *CreateEmpty(const ASTContext &Context,
321 static bool classof(const Stmt *T) {
322 return T->getStmtClass() == CXXReinterpretCastExprClass;
326 /// \brief A C++ \c const_cast expression (C++ [expr.const.cast]).
328 /// This expression node represents a const cast, e.g.,
329 /// \c const_cast<char*>(PtrToConstChar).
331 /// A const_cast can remove type qualifiers but does not change the underlying
333 class CXXConstCastExpr : public CXXNamedCastExpr {
334 CXXConstCastExpr(QualType ty, ExprValueKind VK, Expr *op,
335 TypeSourceInfo *writtenTy, SourceLocation l,
336 SourceLocation RParenLoc, SourceRange AngleBrackets)
337 : CXXNamedCastExpr(CXXConstCastExprClass, ty, VK, CK_NoOp, op,
338 0, writtenTy, l, RParenLoc, AngleBrackets) {}
340 explicit CXXConstCastExpr(EmptyShell Empty)
341 : CXXNamedCastExpr(CXXConstCastExprClass, Empty, 0) { }
344 static CXXConstCastExpr *Create(const ASTContext &Context, QualType T,
345 ExprValueKind VK, Expr *Op,
346 TypeSourceInfo *WrittenTy, SourceLocation L,
347 SourceLocation RParenLoc,
348 SourceRange AngleBrackets);
349 static CXXConstCastExpr *CreateEmpty(const ASTContext &Context);
351 static bool classof(const Stmt *T) {
352 return T->getStmtClass() == CXXConstCastExprClass;
356 /// \brief A call to a literal operator (C++11 [over.literal])
357 /// written as a user-defined literal (C++11 [lit.ext]).
359 /// Represents a user-defined literal, e.g. "foo"_bar or 1.23_xyz. While this
360 /// is semantically equivalent to a normal call, this AST node provides better
361 /// information about the syntactic representation of the literal.
363 /// Since literal operators are never found by ADL and can only be declared at
364 /// namespace scope, a user-defined literal is never dependent.
365 class UserDefinedLiteral : public CallExpr {
366 /// \brief The location of a ud-suffix within the literal.
367 SourceLocation UDSuffixLoc;
370 UserDefinedLiteral(const ASTContext &C, Expr *Fn, ArrayRef<Expr*> Args,
371 QualType T, ExprValueKind VK, SourceLocation LitEndLoc,
372 SourceLocation SuffixLoc)
373 : CallExpr(C, UserDefinedLiteralClass, Fn, 0, Args, T, VK, LitEndLoc),
374 UDSuffixLoc(SuffixLoc) {}
375 explicit UserDefinedLiteral(const ASTContext &C, EmptyShell Empty)
376 : CallExpr(C, UserDefinedLiteralClass, Empty) {}
378 /// The kind of literal operator which is invoked.
379 enum LiteralOperatorKind {
380 LOK_Raw, ///< Raw form: operator "" X (const char *)
381 LOK_Template, ///< Raw form: operator "" X<cs...> ()
382 LOK_Integer, ///< operator "" X (unsigned long long)
383 LOK_Floating, ///< operator "" X (long double)
384 LOK_String, ///< operator "" X (const CharT *, size_t)
385 LOK_Character ///< operator "" X (CharT)
388 /// \brief Returns the kind of literal operator invocation
389 /// which this expression represents.
390 LiteralOperatorKind getLiteralOperatorKind() const;
392 /// \brief If this is not a raw user-defined literal, get the
393 /// underlying cooked literal (representing the literal with the suffix
395 Expr *getCookedLiteral();
396 const Expr *getCookedLiteral() const {
397 return const_cast<UserDefinedLiteral*>(this)->getCookedLiteral();
400 SourceLocation getLocStart() const {
401 if (getLiteralOperatorKind() == LOK_Template)
402 return getRParenLoc();
403 return getArg(0)->getLocStart();
405 SourceLocation getLocEnd() const { return getRParenLoc(); }
408 /// \brief Returns the location of a ud-suffix in the expression.
410 /// For a string literal, there may be multiple identical suffixes. This
411 /// returns the first.
412 SourceLocation getUDSuffixLoc() const { return UDSuffixLoc; }
414 /// \brief Returns the ud-suffix specified for this literal.
415 const IdentifierInfo *getUDSuffix() const;
417 static bool classof(const Stmt *S) {
418 return S->getStmtClass() == UserDefinedLiteralClass;
421 friend class ASTStmtReader;
422 friend class ASTStmtWriter;
425 /// \brief A boolean literal, per ([C++ lex.bool] Boolean literals).
427 class CXXBoolLiteralExpr : public Expr {
431 CXXBoolLiteralExpr(bool val, QualType Ty, SourceLocation l) :
432 Expr(CXXBoolLiteralExprClass, Ty, VK_RValue, OK_Ordinary, false, false,
434 Value(val), Loc(l) {}
436 explicit CXXBoolLiteralExpr(EmptyShell Empty)
437 : Expr(CXXBoolLiteralExprClass, Empty) { }
439 bool getValue() const { return Value; }
440 void setValue(bool V) { Value = V; }
442 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
443 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
445 SourceLocation getLocation() const { return Loc; }
446 void setLocation(SourceLocation L) { Loc = L; }
448 static bool classof(const Stmt *T) {
449 return T->getStmtClass() == CXXBoolLiteralExprClass;
453 child_range children() { return child_range(); }
456 /// \brief The null pointer literal (C++11 [lex.nullptr])
458 /// Introduced in C++11, the only literal of type \c nullptr_t is \c nullptr.
459 class CXXNullPtrLiteralExpr : public Expr {
462 CXXNullPtrLiteralExpr(QualType Ty, SourceLocation l) :
463 Expr(CXXNullPtrLiteralExprClass, Ty, VK_RValue, OK_Ordinary, false, false,
467 explicit CXXNullPtrLiteralExpr(EmptyShell Empty)
468 : Expr(CXXNullPtrLiteralExprClass, Empty) { }
470 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
471 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
473 SourceLocation getLocation() const { return Loc; }
474 void setLocation(SourceLocation L) { Loc = L; }
476 static bool classof(const Stmt *T) {
477 return T->getStmtClass() == CXXNullPtrLiteralExprClass;
480 child_range children() { return child_range(); }
483 /// \brief Implicit construction of a std::initializer_list<T> object from an
484 /// array temporary within list-initialization (C++11 [dcl.init.list]p5).
485 class CXXStdInitializerListExpr : public Expr {
488 CXXStdInitializerListExpr(EmptyShell Empty)
489 : Expr(CXXStdInitializerListExprClass, Empty), SubExpr(nullptr) {}
492 CXXStdInitializerListExpr(QualType Ty, Expr *SubExpr)
493 : Expr(CXXStdInitializerListExprClass, Ty, VK_RValue, OK_Ordinary,
494 Ty->isDependentType(), SubExpr->isValueDependent(),
495 SubExpr->isInstantiationDependent(),
496 SubExpr->containsUnexpandedParameterPack()),
499 Expr *getSubExpr() { return static_cast<Expr*>(SubExpr); }
500 const Expr *getSubExpr() const { return static_cast<const Expr*>(SubExpr); }
502 SourceLocation getLocStart() const LLVM_READONLY {
503 return SubExpr->getLocStart();
505 SourceLocation getLocEnd() const LLVM_READONLY {
506 return SubExpr->getLocEnd();
508 SourceRange getSourceRange() const LLVM_READONLY {
509 return SubExpr->getSourceRange();
512 static bool classof(const Stmt *S) {
513 return S->getStmtClass() == CXXStdInitializerListExprClass;
516 child_range children() { return child_range(&SubExpr, &SubExpr + 1); }
518 friend class ASTReader;
519 friend class ASTStmtReader;
522 /// A C++ \c typeid expression (C++ [expr.typeid]), which gets
523 /// the \c type_info that corresponds to the supplied type, or the (possibly
524 /// dynamic) type of the supplied expression.
526 /// This represents code like \c typeid(int) or \c typeid(*objPtr)
527 class CXXTypeidExpr : public Expr {
529 llvm::PointerUnion<Stmt *, TypeSourceInfo *> Operand;
533 CXXTypeidExpr(QualType Ty, TypeSourceInfo *Operand, SourceRange R)
534 : Expr(CXXTypeidExprClass, Ty, VK_LValue, OK_Ordinary,
535 // typeid is never type-dependent (C++ [temp.dep.expr]p4)
537 // typeid is value-dependent if the type or expression are dependent
538 Operand->getType()->isDependentType(),
539 Operand->getType()->isInstantiationDependentType(),
540 Operand->getType()->containsUnexpandedParameterPack()),
541 Operand(Operand), Range(R) { }
543 CXXTypeidExpr(QualType Ty, Expr *Operand, SourceRange R)
544 : Expr(CXXTypeidExprClass, Ty, VK_LValue, OK_Ordinary,
545 // typeid is never type-dependent (C++ [temp.dep.expr]p4)
547 // typeid is value-dependent if the type or expression are dependent
548 Operand->isTypeDependent() || Operand->isValueDependent(),
549 Operand->isInstantiationDependent(),
550 Operand->containsUnexpandedParameterPack()),
551 Operand(Operand), Range(R) { }
553 CXXTypeidExpr(EmptyShell Empty, bool isExpr)
554 : Expr(CXXTypeidExprClass, Empty) {
556 Operand = (Expr*)nullptr;
558 Operand = (TypeSourceInfo*)nullptr;
561 /// Determine whether this typeid has a type operand which is potentially
562 /// evaluated, per C++11 [expr.typeid]p3.
563 bool isPotentiallyEvaluated() const;
565 bool isTypeOperand() const { return Operand.is<TypeSourceInfo *>(); }
567 /// \brief Retrieves the type operand of this typeid() expression after
568 /// various required adjustments (removing reference types, cv-qualifiers).
569 QualType getTypeOperand(ASTContext &Context) const;
571 /// \brief Retrieve source information for the type operand.
572 TypeSourceInfo *getTypeOperandSourceInfo() const {
573 assert(isTypeOperand() && "Cannot call getTypeOperand for typeid(expr)");
574 return Operand.get<TypeSourceInfo *>();
577 void setTypeOperandSourceInfo(TypeSourceInfo *TSI) {
578 assert(isTypeOperand() && "Cannot call getTypeOperand for typeid(expr)");
582 Expr *getExprOperand() const {
583 assert(!isTypeOperand() && "Cannot call getExprOperand for typeid(type)");
584 return static_cast<Expr*>(Operand.get<Stmt *>());
587 void setExprOperand(Expr *E) {
588 assert(!isTypeOperand() && "Cannot call getExprOperand for typeid(type)");
592 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); }
593 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); }
594 SourceRange getSourceRange() const LLVM_READONLY { return Range; }
595 void setSourceRange(SourceRange R) { Range = R; }
597 static bool classof(const Stmt *T) {
598 return T->getStmtClass() == CXXTypeidExprClass;
602 child_range children() {
603 if (isTypeOperand()) return child_range();
604 Stmt **begin = reinterpret_cast<Stmt**>(&Operand);
605 return child_range(begin, begin + 1);
609 /// \brief A member reference to an MSPropertyDecl.
611 /// This expression always has pseudo-object type, and therefore it is
612 /// typically not encountered in a fully-typechecked expression except
613 /// within the syntactic form of a PseudoObjectExpr.
614 class MSPropertyRefExpr : public Expr {
616 MSPropertyDecl *TheDecl;
617 SourceLocation MemberLoc;
619 NestedNameSpecifierLoc QualifierLoc;
622 MSPropertyRefExpr(Expr *baseExpr, MSPropertyDecl *decl, bool isArrow,
623 QualType ty, ExprValueKind VK,
624 NestedNameSpecifierLoc qualifierLoc,
625 SourceLocation nameLoc)
626 : Expr(MSPropertyRefExprClass, ty, VK, OK_Ordinary,
627 /*type-dependent*/ false, baseExpr->isValueDependent(),
628 baseExpr->isInstantiationDependent(),
629 baseExpr->containsUnexpandedParameterPack()),
630 BaseExpr(baseExpr), TheDecl(decl),
631 MemberLoc(nameLoc), IsArrow(isArrow),
632 QualifierLoc(qualifierLoc) {}
634 MSPropertyRefExpr(EmptyShell Empty) : Expr(MSPropertyRefExprClass, Empty) {}
636 SourceRange getSourceRange() const LLVM_READONLY {
637 return SourceRange(getLocStart(), getLocEnd());
639 bool isImplicitAccess() const {
640 return getBaseExpr() && getBaseExpr()->isImplicitCXXThis();
642 SourceLocation getLocStart() const {
643 if (!isImplicitAccess())
644 return BaseExpr->getLocStart();
645 else if (QualifierLoc)
646 return QualifierLoc.getBeginLoc();
650 SourceLocation getLocEnd() const { return getMemberLoc(); }
652 child_range children() {
653 return child_range((Stmt**)&BaseExpr, (Stmt**)&BaseExpr + 1);
655 static bool classof(const Stmt *T) {
656 return T->getStmtClass() == MSPropertyRefExprClass;
659 Expr *getBaseExpr() const { return BaseExpr; }
660 MSPropertyDecl *getPropertyDecl() const { return TheDecl; }
661 bool isArrow() const { return IsArrow; }
662 SourceLocation getMemberLoc() const { return MemberLoc; }
663 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; }
665 friend class ASTStmtReader;
668 /// A Microsoft C++ @c __uuidof expression, which gets
669 /// the _GUID that corresponds to the supplied type or expression.
671 /// This represents code like @c __uuidof(COMTYPE) or @c __uuidof(*comPtr)
672 class CXXUuidofExpr : public Expr {
674 llvm::PointerUnion<Stmt *, TypeSourceInfo *> Operand;
678 CXXUuidofExpr(QualType Ty, TypeSourceInfo *Operand, SourceRange R)
679 : Expr(CXXUuidofExprClass, Ty, VK_LValue, OK_Ordinary,
680 false, Operand->getType()->isDependentType(),
681 Operand->getType()->isInstantiationDependentType(),
682 Operand->getType()->containsUnexpandedParameterPack()),
683 Operand(Operand), Range(R) { }
685 CXXUuidofExpr(QualType Ty, Expr *Operand, SourceRange R)
686 : Expr(CXXUuidofExprClass, Ty, VK_LValue, OK_Ordinary,
687 false, Operand->isTypeDependent(),
688 Operand->isInstantiationDependent(),
689 Operand->containsUnexpandedParameterPack()),
690 Operand(Operand), Range(R) { }
692 CXXUuidofExpr(EmptyShell Empty, bool isExpr)
693 : Expr(CXXUuidofExprClass, Empty) {
695 Operand = (Expr*)nullptr;
697 Operand = (TypeSourceInfo*)nullptr;
700 bool isTypeOperand() const { return Operand.is<TypeSourceInfo *>(); }
702 /// \brief Retrieves the type operand of this __uuidof() expression after
703 /// various required adjustments (removing reference types, cv-qualifiers).
704 QualType getTypeOperand(ASTContext &Context) const;
706 /// \brief Retrieve source information for the type operand.
707 TypeSourceInfo *getTypeOperandSourceInfo() const {
708 assert(isTypeOperand() && "Cannot call getTypeOperand for __uuidof(expr)");
709 return Operand.get<TypeSourceInfo *>();
712 void setTypeOperandSourceInfo(TypeSourceInfo *TSI) {
713 assert(isTypeOperand() && "Cannot call getTypeOperand for __uuidof(expr)");
717 Expr *getExprOperand() const {
718 assert(!isTypeOperand() && "Cannot call getExprOperand for __uuidof(type)");
719 return static_cast<Expr*>(Operand.get<Stmt *>());
722 void setExprOperand(Expr *E) {
723 assert(!isTypeOperand() && "Cannot call getExprOperand for __uuidof(type)");
727 StringRef getUuidAsStringRef(ASTContext &Context) const;
729 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); }
730 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); }
731 SourceRange getSourceRange() const LLVM_READONLY { return Range; }
732 void setSourceRange(SourceRange R) { Range = R; }
734 static bool classof(const Stmt *T) {
735 return T->getStmtClass() == CXXUuidofExprClass;
738 /// Grabs __declspec(uuid()) off a type, or returns 0 if we cannot resolve to
740 static const UuidAttr *GetUuidAttrOfType(QualType QT,
741 bool *HasMultipleGUIDsPtr = nullptr);
744 child_range children() {
745 if (isTypeOperand()) return child_range();
746 Stmt **begin = reinterpret_cast<Stmt**>(&Operand);
747 return child_range(begin, begin + 1);
751 /// \brief Represents the \c this expression in C++.
753 /// This is a pointer to the object on which the current member function is
754 /// executing (C++ [expr.prim]p3). Example:
760 /// void test() { this->bar(); }
763 class CXXThisExpr : public Expr {
768 CXXThisExpr(SourceLocation L, QualType Type, bool isImplicit)
769 : Expr(CXXThisExprClass, Type, VK_RValue, OK_Ordinary,
770 // 'this' is type-dependent if the class type of the enclosing
771 // member function is dependent (C++ [temp.dep.expr]p2)
772 Type->isDependentType(), Type->isDependentType(),
773 Type->isInstantiationDependentType(),
774 /*ContainsUnexpandedParameterPack=*/false),
775 Loc(L), Implicit(isImplicit) { }
777 CXXThisExpr(EmptyShell Empty) : Expr(CXXThisExprClass, Empty) {}
779 SourceLocation getLocation() const { return Loc; }
780 void setLocation(SourceLocation L) { Loc = L; }
782 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
783 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
785 bool isImplicit() const { return Implicit; }
786 void setImplicit(bool I) { Implicit = I; }
788 static bool classof(const Stmt *T) {
789 return T->getStmtClass() == CXXThisExprClass;
793 child_range children() { return child_range(); }
796 /// \brief A C++ throw-expression (C++ [except.throw]).
798 /// This handles 'throw' (for re-throwing the current exception) and
799 /// 'throw' assignment-expression. When assignment-expression isn't
800 /// present, Op will be null.
801 class CXXThrowExpr : public Expr {
803 SourceLocation ThrowLoc;
804 /// \brief Whether the thrown variable (if any) is in scope.
805 unsigned IsThrownVariableInScope : 1;
807 friend class ASTStmtReader;
810 // \p Ty is the void type which is used as the result type of the
811 // expression. The \p l is the location of the throw keyword. \p expr
812 // can by null, if the optional expression to throw isn't present.
813 CXXThrowExpr(Expr *expr, QualType Ty, SourceLocation l,
814 bool IsThrownVariableInScope) :
815 Expr(CXXThrowExprClass, Ty, VK_RValue, OK_Ordinary, false, false,
816 expr && expr->isInstantiationDependent(),
817 expr && expr->containsUnexpandedParameterPack()),
818 Op(expr), ThrowLoc(l), IsThrownVariableInScope(IsThrownVariableInScope) {}
819 CXXThrowExpr(EmptyShell Empty) : Expr(CXXThrowExprClass, Empty) {}
821 const Expr *getSubExpr() const { return cast_or_null<Expr>(Op); }
822 Expr *getSubExpr() { return cast_or_null<Expr>(Op); }
824 SourceLocation getThrowLoc() const { return ThrowLoc; }
826 /// \brief Determines whether the variable thrown by this expression (if any!)
827 /// is within the innermost try block.
829 /// This information is required to determine whether the NRVO can apply to
831 bool isThrownVariableInScope() const { return IsThrownVariableInScope; }
833 SourceLocation getLocStart() const LLVM_READONLY { return ThrowLoc; }
834 SourceLocation getLocEnd() const LLVM_READONLY {
837 return getSubExpr()->getLocEnd();
840 static bool classof(const Stmt *T) {
841 return T->getStmtClass() == CXXThrowExprClass;
845 child_range children() {
846 return child_range(&Op, Op ? &Op+1 : &Op);
850 /// \brief A default argument (C++ [dcl.fct.default]).
852 /// This wraps up a function call argument that was created from the
853 /// corresponding parameter's default argument, when the call did not
854 /// explicitly supply arguments for all of the parameters.
855 class CXXDefaultArgExpr : public Expr {
856 /// \brief The parameter whose default is being used.
858 /// When the bit is set, the subexpression is stored after the
859 /// CXXDefaultArgExpr itself. When the bit is clear, the parameter's
860 /// actual default expression is the subexpression.
861 llvm::PointerIntPair<ParmVarDecl *, 1, bool> Param;
863 /// \brief The location where the default argument expression was used.
866 CXXDefaultArgExpr(StmtClass SC, SourceLocation Loc, ParmVarDecl *param)
868 param->hasUnparsedDefaultArg()
869 ? param->getType().getNonReferenceType()
870 : param->getDefaultArg()->getType(),
871 param->getDefaultArg()->getValueKind(),
872 param->getDefaultArg()->getObjectKind(), false, false, false, false),
873 Param(param, false), Loc(Loc) { }
875 CXXDefaultArgExpr(StmtClass SC, SourceLocation Loc, ParmVarDecl *param,
877 : Expr(SC, SubExpr->getType(),
878 SubExpr->getValueKind(), SubExpr->getObjectKind(),
879 false, false, false, false),
880 Param(param, true), Loc(Loc) {
881 *reinterpret_cast<Expr **>(this + 1) = SubExpr;
885 CXXDefaultArgExpr(EmptyShell Empty) : Expr(CXXDefaultArgExprClass, Empty) {}
887 // \p Param is the parameter whose default argument is used by this
889 static CXXDefaultArgExpr *Create(const ASTContext &C, SourceLocation Loc,
890 ParmVarDecl *Param) {
891 return new (C) CXXDefaultArgExpr(CXXDefaultArgExprClass, Loc, Param);
894 // \p Param is the parameter whose default argument is used by this
895 // expression, and \p SubExpr is the expression that will actually be used.
896 static CXXDefaultArgExpr *Create(const ASTContext &C, SourceLocation Loc,
897 ParmVarDecl *Param, Expr *SubExpr);
899 // Retrieve the parameter that the argument was created from.
900 const ParmVarDecl *getParam() const { return Param.getPointer(); }
901 ParmVarDecl *getParam() { return Param.getPointer(); }
903 // Retrieve the actual argument to the function call.
904 const Expr *getExpr() const {
906 return *reinterpret_cast<Expr const * const*> (this + 1);
907 return getParam()->getDefaultArg();
911 return *reinterpret_cast<Expr **> (this + 1);
912 return getParam()->getDefaultArg();
915 /// \brief Retrieve the location where this default argument was actually
917 SourceLocation getUsedLocation() const { return Loc; }
919 /// Default argument expressions have no representation in the
920 /// source, so they have an empty source range.
921 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); }
922 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); }
924 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; }
926 static bool classof(const Stmt *T) {
927 return T->getStmtClass() == CXXDefaultArgExprClass;
931 child_range children() { return child_range(); }
933 friend class ASTStmtReader;
934 friend class ASTStmtWriter;
937 /// \brief A use of a default initializer in a constructor or in aggregate
940 /// This wraps a use of a C++ default initializer (technically,
941 /// a brace-or-equal-initializer for a non-static data member) when it
942 /// is implicitly used in a mem-initializer-list in a constructor
943 /// (C++11 [class.base.init]p8) or in aggregate initialization
944 /// (C++1y [dcl.init.aggr]p7).
945 class CXXDefaultInitExpr : public Expr {
946 /// \brief The field whose default is being used.
949 /// \brief The location where the default initializer expression was used.
952 CXXDefaultInitExpr(const ASTContext &C, SourceLocation Loc, FieldDecl *Field,
955 CXXDefaultInitExpr(EmptyShell Empty) : Expr(CXXDefaultInitExprClass, Empty) {}
958 /// \p Field is the non-static data member whose default initializer is used
959 /// by this expression.
960 static CXXDefaultInitExpr *Create(const ASTContext &C, SourceLocation Loc,
962 return new (C) CXXDefaultInitExpr(C, Loc, Field, Field->getType());
965 /// \brief Get the field whose initializer will be used.
966 FieldDecl *getField() { return Field; }
967 const FieldDecl *getField() const { return Field; }
969 /// \brief Get the initialization expression that will be used.
970 const Expr *getExpr() const {
971 assert(Field->getInClassInitializer() && "initializer hasn't been parsed");
972 return Field->getInClassInitializer();
975 assert(Field->getInClassInitializer() && "initializer hasn't been parsed");
976 return Field->getInClassInitializer();
979 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
980 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
982 static bool classof(const Stmt *T) {
983 return T->getStmtClass() == CXXDefaultInitExprClass;
987 child_range children() { return child_range(); }
989 friend class ASTReader;
990 friend class ASTStmtReader;
993 /// \brief Represents a C++ temporary.
995 /// \brief The destructor that needs to be called.
996 const CXXDestructorDecl *Destructor;
998 explicit CXXTemporary(const CXXDestructorDecl *destructor)
999 : Destructor(destructor) { }
1002 static CXXTemporary *Create(const ASTContext &C,
1003 const CXXDestructorDecl *Destructor);
1005 const CXXDestructorDecl *getDestructor() const { return Destructor; }
1006 void setDestructor(const CXXDestructorDecl *Dtor) {
1011 /// \brief Represents binding an expression to a temporary.
1013 /// This ensures the destructor is called for the temporary. It should only be
1014 /// needed for non-POD, non-trivially destructable class types. For example:
1018 /// S() { } // User defined constructor makes S non-POD.
1019 /// ~S() { } // User defined destructor makes it non-trivial.
1022 /// const S &s_ref = S(); // Requires a CXXBindTemporaryExpr.
1025 class CXXBindTemporaryExpr : public Expr {
1030 CXXBindTemporaryExpr(CXXTemporary *temp, Expr* SubExpr)
1031 : Expr(CXXBindTemporaryExprClass, SubExpr->getType(),
1032 VK_RValue, OK_Ordinary, SubExpr->isTypeDependent(),
1033 SubExpr->isValueDependent(),
1034 SubExpr->isInstantiationDependent(),
1035 SubExpr->containsUnexpandedParameterPack()),
1036 Temp(temp), SubExpr(SubExpr) { }
1039 CXXBindTemporaryExpr(EmptyShell Empty)
1040 : Expr(CXXBindTemporaryExprClass, Empty), Temp(nullptr), SubExpr(nullptr) {}
1042 static CXXBindTemporaryExpr *Create(const ASTContext &C, CXXTemporary *Temp,
1045 CXXTemporary *getTemporary() { return Temp; }
1046 const CXXTemporary *getTemporary() const { return Temp; }
1047 void setTemporary(CXXTemporary *T) { Temp = T; }
1049 const Expr *getSubExpr() const { return cast<Expr>(SubExpr); }
1050 Expr *getSubExpr() { return cast<Expr>(SubExpr); }
1051 void setSubExpr(Expr *E) { SubExpr = E; }
1053 SourceLocation getLocStart() const LLVM_READONLY {
1054 return SubExpr->getLocStart();
1056 SourceLocation getLocEnd() const LLVM_READONLY { return SubExpr->getLocEnd();}
1058 // Implement isa/cast/dyncast/etc.
1059 static bool classof(const Stmt *T) {
1060 return T->getStmtClass() == CXXBindTemporaryExprClass;
1064 child_range children() { return child_range(&SubExpr, &SubExpr + 1); }
1067 /// \brief Represents a call to a C++ constructor.
1068 class CXXConstructExpr : public Expr {
1070 enum ConstructionKind {
1078 CXXConstructorDecl *Constructor;
1081 SourceRange ParenOrBraceRange;
1082 unsigned NumArgs : 16;
1084 bool HadMultipleCandidates : 1;
1085 bool ListInitialization : 1;
1086 bool StdInitListInitialization : 1;
1087 bool ZeroInitialization : 1;
1088 unsigned ConstructKind : 2;
1092 CXXConstructExpr(const ASTContext &C, StmtClass SC, QualType T,
1094 CXXConstructorDecl *d, bool elidable,
1095 ArrayRef<Expr *> Args,
1096 bool HadMultipleCandidates,
1097 bool ListInitialization,
1098 bool StdInitListInitialization,
1099 bool ZeroInitialization,
1100 ConstructionKind ConstructKind,
1101 SourceRange ParenOrBraceRange);
1103 /// \brief Construct an empty C++ construction expression.
1104 CXXConstructExpr(StmtClass SC, EmptyShell Empty)
1105 : Expr(SC, Empty), Constructor(nullptr), NumArgs(0), Elidable(false),
1106 HadMultipleCandidates(false), ListInitialization(false),
1107 ZeroInitialization(false), ConstructKind(0), Args(nullptr)
1111 /// \brief Construct an empty C++ construction expression.
1112 explicit CXXConstructExpr(EmptyShell Empty)
1113 : Expr(CXXConstructExprClass, Empty), Constructor(nullptr),
1114 NumArgs(0), Elidable(false), HadMultipleCandidates(false),
1115 ListInitialization(false), ZeroInitialization(false),
1116 ConstructKind(0), Args(nullptr)
1119 static CXXConstructExpr *Create(const ASTContext &C, QualType T,
1121 CXXConstructorDecl *D, bool Elidable,
1122 ArrayRef<Expr *> Args,
1123 bool HadMultipleCandidates,
1124 bool ListInitialization,
1125 bool StdInitListInitialization,
1126 bool ZeroInitialization,
1127 ConstructionKind ConstructKind,
1128 SourceRange ParenOrBraceRange);
1130 CXXConstructorDecl* getConstructor() const { return Constructor; }
1131 void setConstructor(CXXConstructorDecl *C) { Constructor = C; }
1133 SourceLocation getLocation() const { return Loc; }
1134 void setLocation(SourceLocation Loc) { this->Loc = Loc; }
1136 /// \brief Whether this construction is elidable.
1137 bool isElidable() const { return Elidable; }
1138 void setElidable(bool E) { Elidable = E; }
1140 /// \brief Whether the referred constructor was resolved from
1141 /// an overloaded set having size greater than 1.
1142 bool hadMultipleCandidates() const { return HadMultipleCandidates; }
1143 void setHadMultipleCandidates(bool V) { HadMultipleCandidates = V; }
1145 /// \brief Whether this constructor call was written as list-initialization.
1146 bool isListInitialization() const { return ListInitialization; }
1147 void setListInitialization(bool V) { ListInitialization = V; }
1149 /// \brief Whether this constructor call was written as list-initialization,
1150 /// but was interpreted as forming a std::initializer_list<T> from the list
1151 /// and passing that as a single constructor argument.
1152 /// See C++11 [over.match.list]p1 bullet 1.
1153 bool isStdInitListInitialization() const { return StdInitListInitialization; }
1154 void setStdInitListInitialization(bool V) { StdInitListInitialization = V; }
1156 /// \brief Whether this construction first requires
1157 /// zero-initialization before the initializer is called.
1158 bool requiresZeroInitialization() const { return ZeroInitialization; }
1159 void setRequiresZeroInitialization(bool ZeroInit) {
1160 ZeroInitialization = ZeroInit;
1163 /// \brief Determine whether this constructor is actually constructing
1164 /// a base class (rather than a complete object).
1165 ConstructionKind getConstructionKind() const {
1166 return (ConstructionKind)ConstructKind;
1168 void setConstructionKind(ConstructionKind CK) {
1172 typedef ExprIterator arg_iterator;
1173 typedef ConstExprIterator const_arg_iterator;
1174 typedef llvm::iterator_range<arg_iterator> arg_range;
1175 typedef llvm::iterator_range<const_arg_iterator> arg_const_range;
1177 arg_range arguments() { return arg_range(arg_begin(), arg_end()); }
1178 arg_const_range arguments() const {
1179 return arg_const_range(arg_begin(), arg_end());
1182 arg_iterator arg_begin() { return Args; }
1183 arg_iterator arg_end() { return Args + NumArgs; }
1184 const_arg_iterator arg_begin() const { return Args; }
1185 const_arg_iterator arg_end() const { return Args + NumArgs; }
1187 Expr **getArgs() { return reinterpret_cast<Expr **>(Args); }
1188 const Expr *const *getArgs() const {
1189 return const_cast<CXXConstructExpr *>(this)->getArgs();
1191 unsigned getNumArgs() const { return NumArgs; }
1193 /// \brief Return the specified argument.
1194 Expr *getArg(unsigned Arg) {
1195 assert(Arg < NumArgs && "Arg access out of range!");
1196 return cast<Expr>(Args[Arg]);
1198 const Expr *getArg(unsigned Arg) const {
1199 assert(Arg < NumArgs && "Arg access out of range!");
1200 return cast<Expr>(Args[Arg]);
1203 /// \brief Set the specified argument.
1204 void setArg(unsigned Arg, Expr *ArgExpr) {
1205 assert(Arg < NumArgs && "Arg access out of range!");
1206 Args[Arg] = ArgExpr;
1209 SourceLocation getLocStart() const LLVM_READONLY;
1210 SourceLocation getLocEnd() const LLVM_READONLY;
1211 SourceRange getParenOrBraceRange() const { return ParenOrBraceRange; }
1212 void setParenOrBraceRange(SourceRange Range) { ParenOrBraceRange = Range; }
1214 static bool classof(const Stmt *T) {
1215 return T->getStmtClass() == CXXConstructExprClass ||
1216 T->getStmtClass() == CXXTemporaryObjectExprClass;
1220 child_range children() {
1221 return child_range(&Args[0], &Args[0]+NumArgs);
1224 friend class ASTStmtReader;
1227 /// \brief Represents an explicit C++ type conversion that uses "functional"
1228 /// notation (C++ [expr.type.conv]).
1234 class CXXFunctionalCastExpr : public ExplicitCastExpr {
1235 SourceLocation LParenLoc;
1236 SourceLocation RParenLoc;
1238 CXXFunctionalCastExpr(QualType ty, ExprValueKind VK,
1239 TypeSourceInfo *writtenTy,
1240 CastKind kind, Expr *castExpr, unsigned pathSize,
1241 SourceLocation lParenLoc, SourceLocation rParenLoc)
1242 : ExplicitCastExpr(CXXFunctionalCastExprClass, ty, VK, kind,
1243 castExpr, pathSize, writtenTy),
1244 LParenLoc(lParenLoc), RParenLoc(rParenLoc) {}
1246 explicit CXXFunctionalCastExpr(EmptyShell Shell, unsigned PathSize)
1247 : ExplicitCastExpr(CXXFunctionalCastExprClass, Shell, PathSize) { }
1250 static CXXFunctionalCastExpr *Create(const ASTContext &Context, QualType T,
1252 TypeSourceInfo *Written,
1253 CastKind Kind, Expr *Op,
1254 const CXXCastPath *Path,
1255 SourceLocation LPLoc,
1256 SourceLocation RPLoc);
1257 static CXXFunctionalCastExpr *CreateEmpty(const ASTContext &Context,
1260 SourceLocation getLParenLoc() const { return LParenLoc; }
1261 void setLParenLoc(SourceLocation L) { LParenLoc = L; }
1262 SourceLocation getRParenLoc() const { return RParenLoc; }
1263 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
1265 SourceLocation getLocStart() const LLVM_READONLY;
1266 SourceLocation getLocEnd() const LLVM_READONLY;
1268 static bool classof(const Stmt *T) {
1269 return T->getStmtClass() == CXXFunctionalCastExprClass;
1273 /// @brief Represents a C++ functional cast expression that builds a
1274 /// temporary object.
1276 /// This expression type represents a C++ "functional" cast
1277 /// (C++[expr.type.conv]) with N != 1 arguments that invokes a
1278 /// constructor to build a temporary object. With N == 1 arguments the
1279 /// functional cast expression will be represented by CXXFunctionalCastExpr.
1282 /// struct X { X(int, float); }
1285 /// return X(1, 3.14f); // creates a CXXTemporaryObjectExpr
1288 class CXXTemporaryObjectExpr : public CXXConstructExpr {
1289 TypeSourceInfo *Type;
1292 CXXTemporaryObjectExpr(const ASTContext &C, CXXConstructorDecl *Cons,
1293 TypeSourceInfo *Type,
1294 ArrayRef<Expr *> Args,
1295 SourceRange ParenOrBraceRange,
1296 bool HadMultipleCandidates,
1297 bool ListInitialization,
1298 bool StdInitListInitialization,
1299 bool ZeroInitialization);
1300 explicit CXXTemporaryObjectExpr(EmptyShell Empty)
1301 : CXXConstructExpr(CXXTemporaryObjectExprClass, Empty), Type() { }
1303 TypeSourceInfo *getTypeSourceInfo() const { return Type; }
1305 SourceLocation getLocStart() const LLVM_READONLY;
1306 SourceLocation getLocEnd() const LLVM_READONLY;
1308 static bool classof(const Stmt *T) {
1309 return T->getStmtClass() == CXXTemporaryObjectExprClass;
1312 friend class ASTStmtReader;
1315 /// \brief A C++ lambda expression, which produces a function object
1316 /// (of unspecified type) that can be invoked later.
1320 /// void low_pass_filter(std::vector<double> &values, double cutoff) {
1321 /// values.erase(std::remove_if(values.begin(), values.end(),
1322 /// [=](double value) { return value > cutoff; });
1326 /// C++11 lambda expressions can capture local variables, either by copying
1327 /// the values of those local variables at the time the function
1328 /// object is constructed (not when it is called!) or by holding a
1329 /// reference to the local variable. These captures can occur either
1330 /// implicitly or can be written explicitly between the square
1331 /// brackets ([...]) that start the lambda expression.
1333 /// C++1y introduces a new form of "capture" called an init-capture that
1334 /// includes an initializing expression (rather than capturing a variable),
1335 /// and which can never occur implicitly.
1336 class LambdaExpr : public Expr {
1337 /// \brief The source range that covers the lambda introducer ([...]).
1338 SourceRange IntroducerRange;
1340 /// \brief The source location of this lambda's capture-default ('=' or '&').
1341 SourceLocation CaptureDefaultLoc;
1343 /// \brief The number of captures.
1344 unsigned NumCaptures : 16;
1346 /// \brief The default capture kind, which is a value of type
1347 /// LambdaCaptureDefault.
1348 unsigned CaptureDefault : 2;
1350 /// \brief Whether this lambda had an explicit parameter list vs. an
1351 /// implicit (and empty) parameter list.
1352 unsigned ExplicitParams : 1;
1354 /// \brief Whether this lambda had the result type explicitly specified.
1355 unsigned ExplicitResultType : 1;
1357 /// \brief Whether there are any array index variables stored at the end of
1358 /// this lambda expression.
1359 unsigned HasArrayIndexVars : 1;
1361 /// \brief The location of the closing brace ('}') that completes
1364 /// The location of the brace is also available by looking up the
1365 /// function call operator in the lambda class. However, it is
1366 /// stored here to improve the performance of getSourceRange(), and
1367 /// to avoid having to deserialize the function call operator from a
1368 /// module file just to determine the source range.
1369 SourceLocation ClosingBrace;
1371 // Note: The capture initializers are stored directly after the lambda
1372 // expression, along with the index variables used to initialize by-copy
1375 typedef LambdaCapture Capture;
1377 /// \brief Construct a lambda expression.
1378 LambdaExpr(QualType T, SourceRange IntroducerRange,
1379 LambdaCaptureDefault CaptureDefault,
1380 SourceLocation CaptureDefaultLoc,
1381 ArrayRef<Capture> Captures,
1382 bool ExplicitParams,
1383 bool ExplicitResultType,
1384 ArrayRef<Expr *> CaptureInits,
1385 ArrayRef<VarDecl *> ArrayIndexVars,
1386 ArrayRef<unsigned> ArrayIndexStarts,
1387 SourceLocation ClosingBrace,
1388 bool ContainsUnexpandedParameterPack);
1390 /// \brief Construct an empty lambda expression.
1391 LambdaExpr(EmptyShell Empty, unsigned NumCaptures, bool HasArrayIndexVars)
1392 : Expr(LambdaExprClass, Empty),
1393 NumCaptures(NumCaptures), CaptureDefault(LCD_None), ExplicitParams(false),
1394 ExplicitResultType(false), HasArrayIndexVars(true) {
1395 getStoredStmts()[NumCaptures] = nullptr;
1398 Stmt **getStoredStmts() const {
1399 return reinterpret_cast<Stmt **>(const_cast<LambdaExpr *>(this) + 1);
1402 /// \brief Retrieve the mapping from captures to the first array index
1404 unsigned *getArrayIndexStarts() const {
1405 return reinterpret_cast<unsigned *>(getStoredStmts() + NumCaptures + 1);
1408 /// \brief Retrieve the complete set of array-index variables.
1409 VarDecl **getArrayIndexVars() const {
1410 unsigned ArrayIndexSize =
1411 llvm::RoundUpToAlignment(sizeof(unsigned) * (NumCaptures + 1),
1412 llvm::alignOf<VarDecl*>());
1413 return reinterpret_cast<VarDecl **>(
1414 reinterpret_cast<char*>(getArrayIndexStarts()) + ArrayIndexSize);
1418 /// \brief Construct a new lambda expression.
1419 static LambdaExpr *Create(const ASTContext &C,
1420 CXXRecordDecl *Class,
1421 SourceRange IntroducerRange,
1422 LambdaCaptureDefault CaptureDefault,
1423 SourceLocation CaptureDefaultLoc,
1424 ArrayRef<Capture> Captures,
1425 bool ExplicitParams,
1426 bool ExplicitResultType,
1427 ArrayRef<Expr *> CaptureInits,
1428 ArrayRef<VarDecl *> ArrayIndexVars,
1429 ArrayRef<unsigned> ArrayIndexStarts,
1430 SourceLocation ClosingBrace,
1431 bool ContainsUnexpandedParameterPack);
1433 /// \brief Construct a new lambda expression that will be deserialized from
1434 /// an external source.
1435 static LambdaExpr *CreateDeserialized(const ASTContext &C,
1436 unsigned NumCaptures,
1437 unsigned NumArrayIndexVars);
1439 /// \brief Determine the default capture kind for this lambda.
1440 LambdaCaptureDefault getCaptureDefault() const {
1441 return static_cast<LambdaCaptureDefault>(CaptureDefault);
1444 /// \brief Retrieve the location of this lambda's capture-default, if any.
1445 SourceLocation getCaptureDefaultLoc() const {
1446 return CaptureDefaultLoc;
1449 /// \brief An iterator that walks over the captures of the lambda,
1450 /// both implicit and explicit.
1451 typedef const Capture *capture_iterator;
1453 /// \brief An iterator over a range of lambda captures.
1454 typedef llvm::iterator_range<capture_iterator> capture_range;
1456 /// \brief Retrieve this lambda's captures.
1457 capture_range captures() const;
1459 /// \brief Retrieve an iterator pointing to the first lambda capture.
1460 capture_iterator capture_begin() const;
1462 /// \brief Retrieve an iterator pointing past the end of the
1463 /// sequence of lambda captures.
1464 capture_iterator capture_end() const;
1466 /// \brief Determine the number of captures in this lambda.
1467 unsigned capture_size() const { return NumCaptures; }
1469 /// \brief Retrieve this lambda's explicit captures.
1470 capture_range explicit_captures() const;
1472 /// \brief Retrieve an iterator pointing to the first explicit
1474 capture_iterator explicit_capture_begin() const;
1476 /// \brief Retrieve an iterator pointing past the end of the sequence of
1477 /// explicit lambda captures.
1478 capture_iterator explicit_capture_end() const;
1480 /// \brief Retrieve this lambda's implicit captures.
1481 capture_range implicit_captures() const;
1483 /// \brief Retrieve an iterator pointing to the first implicit
1485 capture_iterator implicit_capture_begin() const;
1487 /// \brief Retrieve an iterator pointing past the end of the sequence of
1488 /// implicit lambda captures.
1489 capture_iterator implicit_capture_end() const;
1491 /// \brief Iterator that walks over the capture initialization
1493 typedef Expr **capture_init_iterator;
1495 /// \brief Retrieve the initialization expressions for this lambda's captures.
1496 llvm::iterator_range<capture_init_iterator> capture_inits() const {
1497 return llvm::iterator_range<capture_init_iterator>(capture_init_begin(),
1498 capture_init_end());
1501 /// \brief Retrieve the first initialization argument for this
1502 /// lambda expression (which initializes the first capture field).
1503 capture_init_iterator capture_init_begin() const {
1504 return reinterpret_cast<Expr **>(getStoredStmts());
1507 /// \brief Retrieve the iterator pointing one past the last
1508 /// initialization argument for this lambda expression.
1509 capture_init_iterator capture_init_end() const {
1510 return capture_init_begin() + NumCaptures;
1513 /// \brief Retrieve the set of index variables used in the capture
1514 /// initializer of an array captured by copy.
1516 /// \param Iter The iterator that points at the capture initializer for
1517 /// which we are extracting the corresponding index variables.
1518 ArrayRef<VarDecl *> getCaptureInitIndexVars(capture_init_iterator Iter) const;
1520 /// \brief Retrieve the source range covering the lambda introducer,
1521 /// which contains the explicit capture list surrounded by square
1522 /// brackets ([...]).
1523 SourceRange getIntroducerRange() const { return IntroducerRange; }
1525 /// \brief Retrieve the class that corresponds to the lambda.
1527 /// This is the "closure type" (C++1y [expr.prim.lambda]), and stores the
1528 /// captures in its fields and provides the various operations permitted
1529 /// on a lambda (copying, calling).
1530 CXXRecordDecl *getLambdaClass() const;
1532 /// \brief Retrieve the function call operator associated with this
1533 /// lambda expression.
1534 CXXMethodDecl *getCallOperator() const;
1536 /// \brief If this is a generic lambda expression, retrieve the template
1537 /// parameter list associated with it, or else return null.
1538 TemplateParameterList *getTemplateParameterList() const;
1540 /// \brief Whether this is a generic lambda.
1541 bool isGenericLambda() const { return getTemplateParameterList(); }
1543 /// \brief Retrieve the body of the lambda.
1544 CompoundStmt *getBody() const;
1546 /// \brief Determine whether the lambda is mutable, meaning that any
1547 /// captures values can be modified.
1548 bool isMutable() const;
1550 /// \brief Determine whether this lambda has an explicit parameter
1551 /// list vs. an implicit (empty) parameter list.
1552 bool hasExplicitParameters() const { return ExplicitParams; }
1554 /// \brief Whether this lambda had its result type explicitly specified.
1555 bool hasExplicitResultType() const { return ExplicitResultType; }
1557 static bool classof(const Stmt *T) {
1558 return T->getStmtClass() == LambdaExprClass;
1561 SourceLocation getLocStart() const LLVM_READONLY {
1562 return IntroducerRange.getBegin();
1564 SourceLocation getLocEnd() const LLVM_READONLY { return ClosingBrace; }
1566 child_range children() {
1567 return child_range(getStoredStmts(), getStoredStmts() + NumCaptures + 1);
1570 friend class ASTStmtReader;
1571 friend class ASTStmtWriter;
1574 /// An expression "T()" which creates a value-initialized rvalue of type
1575 /// T, which is a non-class type. See (C++98 [5.2.3p2]).
1576 class CXXScalarValueInitExpr : public Expr {
1577 SourceLocation RParenLoc;
1578 TypeSourceInfo *TypeInfo;
1580 friend class ASTStmtReader;
1583 /// \brief Create an explicitly-written scalar-value initialization
1585 CXXScalarValueInitExpr(QualType Type, TypeSourceInfo *TypeInfo,
1586 SourceLocation rParenLoc)
1587 : Expr(CXXScalarValueInitExprClass, Type, VK_RValue, OK_Ordinary,
1588 false, false, Type->isInstantiationDependentType(),
1589 Type->containsUnexpandedParameterPack()),
1590 RParenLoc(rParenLoc), TypeInfo(TypeInfo) {}
1592 explicit CXXScalarValueInitExpr(EmptyShell Shell)
1593 : Expr(CXXScalarValueInitExprClass, Shell) { }
1595 TypeSourceInfo *getTypeSourceInfo() const {
1599 SourceLocation getRParenLoc() const { return RParenLoc; }
1601 SourceLocation getLocStart() const LLVM_READONLY;
1602 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
1604 static bool classof(const Stmt *T) {
1605 return T->getStmtClass() == CXXScalarValueInitExprClass;
1609 child_range children() { return child_range(); }
1612 /// \brief Represents a new-expression for memory allocation and constructor
1613 /// calls, e.g: "new CXXNewExpr(foo)".
1614 class CXXNewExpr : public Expr {
1615 /// Contains an optional array size expression, an optional initialization
1616 /// expression, and any number of optional placement arguments, in that order.
1618 /// \brief Points to the allocation function used.
1619 FunctionDecl *OperatorNew;
1620 /// \brief Points to the deallocation function used in case of error. May be
1622 FunctionDecl *OperatorDelete;
1624 /// \brief The allocated type-source information, as written in the source.
1625 TypeSourceInfo *AllocatedTypeInfo;
1627 /// \brief If the allocated type was expressed as a parenthesized type-id,
1628 /// the source range covering the parenthesized type-id.
1629 SourceRange TypeIdParens;
1631 /// \brief Range of the entire new expression.
1634 /// \brief Source-range of a paren-delimited initializer.
1635 SourceRange DirectInitRange;
1637 /// Was the usage ::new, i.e. is the global new to be used?
1639 /// Do we allocate an array? If so, the first SubExpr is the size expression.
1641 /// If this is an array allocation, does the usual deallocation
1642 /// function for the allocated type want to know the allocated size?
1643 bool UsualArrayDeleteWantsSize : 1;
1644 /// The number of placement new arguments.
1645 unsigned NumPlacementArgs : 13;
1646 /// What kind of initializer do we have? Could be none, parens, or braces.
1647 /// In storage, we distinguish between "none, and no initializer expr", and
1648 /// "none, but an implicit initializer expr".
1649 unsigned StoredInitializationStyle : 2;
1651 friend class ASTStmtReader;
1652 friend class ASTStmtWriter;
1654 enum InitializationStyle {
1655 NoInit, ///< New-expression has no initializer as written.
1656 CallInit, ///< New-expression has a C++98 paren-delimited initializer.
1657 ListInit ///< New-expression has a C++11 list-initializer.
1660 CXXNewExpr(const ASTContext &C, bool globalNew, FunctionDecl *operatorNew,
1661 FunctionDecl *operatorDelete, bool usualArrayDeleteWantsSize,
1662 ArrayRef<Expr*> placementArgs,
1663 SourceRange typeIdParens, Expr *arraySize,
1664 InitializationStyle initializationStyle, Expr *initializer,
1665 QualType ty, TypeSourceInfo *AllocatedTypeInfo,
1666 SourceRange Range, SourceRange directInitRange);
1667 explicit CXXNewExpr(EmptyShell Shell)
1668 : Expr(CXXNewExprClass, Shell), SubExprs(nullptr) { }
1670 void AllocateArgsArray(const ASTContext &C, bool isArray,
1671 unsigned numPlaceArgs, bool hasInitializer);
1673 QualType getAllocatedType() const {
1674 assert(getType()->isPointerType());
1675 return getType()->getAs<PointerType>()->getPointeeType();
1678 TypeSourceInfo *getAllocatedTypeSourceInfo() const {
1679 return AllocatedTypeInfo;
1682 /// \brief True if the allocation result needs to be null-checked.
1684 /// C++11 [expr.new]p13:
1685 /// If the allocation function returns null, initialization shall
1686 /// not be done, the deallocation function shall not be called,
1687 /// and the value of the new-expression shall be null.
1689 /// An allocation function is not allowed to return null unless it
1690 /// has a non-throwing exception-specification. The '03 rule is
1691 /// identical except that the definition of a non-throwing
1692 /// exception specification is just "is it throw()?".
1693 bool shouldNullCheckAllocation(const ASTContext &Ctx) const;
1695 FunctionDecl *getOperatorNew() const { return OperatorNew; }
1696 void setOperatorNew(FunctionDecl *D) { OperatorNew = D; }
1697 FunctionDecl *getOperatorDelete() const { return OperatorDelete; }
1698 void setOperatorDelete(FunctionDecl *D) { OperatorDelete = D; }
1700 bool isArray() const { return Array; }
1701 Expr *getArraySize() {
1702 return Array ? cast<Expr>(SubExprs[0]) : nullptr;
1704 const Expr *getArraySize() const {
1705 return Array ? cast<Expr>(SubExprs[0]) : nullptr;
1708 unsigned getNumPlacementArgs() const { return NumPlacementArgs; }
1709 Expr **getPlacementArgs() {
1710 return reinterpret_cast<Expr **>(SubExprs + Array + hasInitializer());
1713 Expr *getPlacementArg(unsigned i) {
1714 assert(i < NumPlacementArgs && "Index out of range");
1715 return getPlacementArgs()[i];
1717 const Expr *getPlacementArg(unsigned i) const {
1718 assert(i < NumPlacementArgs && "Index out of range");
1719 return const_cast<CXXNewExpr*>(this)->getPlacementArg(i);
1722 bool isParenTypeId() const { return TypeIdParens.isValid(); }
1723 SourceRange getTypeIdParens() const { return TypeIdParens; }
1725 bool isGlobalNew() const { return GlobalNew; }
1727 /// \brief Whether this new-expression has any initializer at all.
1728 bool hasInitializer() const { return StoredInitializationStyle > 0; }
1730 /// \brief The kind of initializer this new-expression has.
1731 InitializationStyle getInitializationStyle() const {
1732 if (StoredInitializationStyle == 0)
1734 return static_cast<InitializationStyle>(StoredInitializationStyle-1);
1737 /// \brief The initializer of this new-expression.
1738 Expr *getInitializer() {
1739 return hasInitializer() ? cast<Expr>(SubExprs[Array]) : nullptr;
1741 const Expr *getInitializer() const {
1742 return hasInitializer() ? cast<Expr>(SubExprs[Array]) : nullptr;
1745 /// \brief Returns the CXXConstructExpr from this new-expression, or null.
1746 const CXXConstructExpr* getConstructExpr() const {
1747 return dyn_cast_or_null<CXXConstructExpr>(getInitializer());
1750 /// Answers whether the usual array deallocation function for the
1751 /// allocated type expects the size of the allocation as a
1753 bool doesUsualArrayDeleteWantSize() const {
1754 return UsualArrayDeleteWantsSize;
1757 typedef ExprIterator arg_iterator;
1758 typedef ConstExprIterator const_arg_iterator;
1760 arg_iterator placement_arg_begin() {
1761 return SubExprs + Array + hasInitializer();
1763 arg_iterator placement_arg_end() {
1764 return SubExprs + Array + hasInitializer() + getNumPlacementArgs();
1766 const_arg_iterator placement_arg_begin() const {
1767 return SubExprs + Array + hasInitializer();
1769 const_arg_iterator placement_arg_end() const {
1770 return SubExprs + Array + hasInitializer() + getNumPlacementArgs();
1773 typedef Stmt **raw_arg_iterator;
1774 raw_arg_iterator raw_arg_begin() { return SubExprs; }
1775 raw_arg_iterator raw_arg_end() {
1776 return SubExprs + Array + hasInitializer() + getNumPlacementArgs();
1778 const_arg_iterator raw_arg_begin() const { return SubExprs; }
1779 const_arg_iterator raw_arg_end() const {
1780 return SubExprs + Array + hasInitializer() + getNumPlacementArgs();
1783 SourceLocation getStartLoc() const { return Range.getBegin(); }
1784 SourceLocation getEndLoc() const { return Range.getEnd(); }
1786 SourceRange getDirectInitRange() const { return DirectInitRange; }
1788 SourceRange getSourceRange() const LLVM_READONLY {
1791 SourceLocation getLocStart() const LLVM_READONLY { return getStartLoc(); }
1792 SourceLocation getLocEnd() const LLVM_READONLY { return getEndLoc(); }
1794 static bool classof(const Stmt *T) {
1795 return T->getStmtClass() == CXXNewExprClass;
1799 child_range children() {
1800 return child_range(raw_arg_begin(), raw_arg_end());
1804 /// \brief Represents a \c delete expression for memory deallocation and
1805 /// destructor calls, e.g. "delete[] pArray".
1806 class CXXDeleteExpr : public Expr {
1807 /// Points to the operator delete overload that is used. Could be a member.
1808 FunctionDecl *OperatorDelete;
1809 /// The pointer expression to be deleted.
1811 /// Location of the expression.
1813 /// Is this a forced global delete, i.e. "::delete"?
1814 bool GlobalDelete : 1;
1815 /// Is this the array form of delete, i.e. "delete[]"?
1817 /// ArrayFormAsWritten can be different from ArrayForm if 'delete' is applied
1818 /// to pointer-to-array type (ArrayFormAsWritten will be false while ArrayForm
1820 bool ArrayFormAsWritten : 1;
1821 /// Does the usual deallocation function for the element type require
1822 /// a size_t argument?
1823 bool UsualArrayDeleteWantsSize : 1;
1825 CXXDeleteExpr(QualType ty, bool globalDelete, bool arrayForm,
1826 bool arrayFormAsWritten, bool usualArrayDeleteWantsSize,
1827 FunctionDecl *operatorDelete, Expr *arg, SourceLocation loc)
1828 : Expr(CXXDeleteExprClass, ty, VK_RValue, OK_Ordinary, false, false,
1829 arg->isInstantiationDependent(),
1830 arg->containsUnexpandedParameterPack()),
1831 OperatorDelete(operatorDelete), Argument(arg), Loc(loc),
1832 GlobalDelete(globalDelete),
1833 ArrayForm(arrayForm), ArrayFormAsWritten(arrayFormAsWritten),
1834 UsualArrayDeleteWantsSize(usualArrayDeleteWantsSize) { }
1835 explicit CXXDeleteExpr(EmptyShell Shell)
1836 : Expr(CXXDeleteExprClass, Shell), OperatorDelete(nullptr),
1837 Argument(nullptr) {}
1839 bool isGlobalDelete() const { return GlobalDelete; }
1840 bool isArrayForm() const { return ArrayForm; }
1841 bool isArrayFormAsWritten() const { return ArrayFormAsWritten; }
1843 /// Answers whether the usual array deallocation function for the
1844 /// allocated type expects the size of the allocation as a
1845 /// parameter. This can be true even if the actual deallocation
1846 /// function that we're using doesn't want a size.
1847 bool doesUsualArrayDeleteWantSize() const {
1848 return UsualArrayDeleteWantsSize;
1851 FunctionDecl *getOperatorDelete() const { return OperatorDelete; }
1853 Expr *getArgument() { return cast<Expr>(Argument); }
1854 const Expr *getArgument() const { return cast<Expr>(Argument); }
1856 /// \brief Retrieve the type being destroyed.
1858 /// If the type being destroyed is a dependent type which may or may not
1859 /// be a pointer, return an invalid type.
1860 QualType getDestroyedType() const;
1862 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
1863 SourceLocation getLocEnd() const LLVM_READONLY {return Argument->getLocEnd();}
1865 static bool classof(const Stmt *T) {
1866 return T->getStmtClass() == CXXDeleteExprClass;
1870 child_range children() { return child_range(&Argument, &Argument+1); }
1872 friend class ASTStmtReader;
1875 /// \brief Stores the type being destroyed by a pseudo-destructor expression.
1876 class PseudoDestructorTypeStorage {
1877 /// \brief Either the type source information or the name of the type, if
1878 /// it couldn't be resolved due to type-dependence.
1879 llvm::PointerUnion<TypeSourceInfo *, IdentifierInfo *> Type;
1881 /// \brief The starting source location of the pseudo-destructor type.
1882 SourceLocation Location;
1885 PseudoDestructorTypeStorage() { }
1887 PseudoDestructorTypeStorage(IdentifierInfo *II, SourceLocation Loc)
1888 : Type(II), Location(Loc) { }
1890 PseudoDestructorTypeStorage(TypeSourceInfo *Info);
1892 TypeSourceInfo *getTypeSourceInfo() const {
1893 return Type.dyn_cast<TypeSourceInfo *>();
1896 IdentifierInfo *getIdentifier() const {
1897 return Type.dyn_cast<IdentifierInfo *>();
1900 SourceLocation getLocation() const { return Location; }
1903 /// \brief Represents a C++ pseudo-destructor (C++ [expr.pseudo]).
1905 /// A pseudo-destructor is an expression that looks like a member access to a
1906 /// destructor of a scalar type, except that scalar types don't have
1907 /// destructors. For example:
1911 /// void f(int *p) {
1916 /// Pseudo-destructors typically occur when instantiating templates such as:
1919 /// template<typename T>
1920 /// void destroy(T* ptr) {
1925 /// for scalar types. A pseudo-destructor expression has no run-time semantics
1926 /// beyond evaluating the base expression.
1927 class CXXPseudoDestructorExpr : public Expr {
1928 /// \brief The base expression (that is being destroyed).
1931 /// \brief Whether the operator was an arrow ('->'); otherwise, it was a
1935 /// \brief The location of the '.' or '->' operator.
1936 SourceLocation OperatorLoc;
1938 /// \brief The nested-name-specifier that follows the operator, if present.
1939 NestedNameSpecifierLoc QualifierLoc;
1941 /// \brief The type that precedes the '::' in a qualified pseudo-destructor
1943 TypeSourceInfo *ScopeType;
1945 /// \brief The location of the '::' in a qualified pseudo-destructor
1947 SourceLocation ColonColonLoc;
1949 /// \brief The location of the '~'.
1950 SourceLocation TildeLoc;
1952 /// \brief The type being destroyed, or its name if we were unable to
1953 /// resolve the name.
1954 PseudoDestructorTypeStorage DestroyedType;
1956 friend class ASTStmtReader;
1959 CXXPseudoDestructorExpr(const ASTContext &Context,
1960 Expr *Base, bool isArrow, SourceLocation OperatorLoc,
1961 NestedNameSpecifierLoc QualifierLoc,
1962 TypeSourceInfo *ScopeType,
1963 SourceLocation ColonColonLoc,
1964 SourceLocation TildeLoc,
1965 PseudoDestructorTypeStorage DestroyedType);
1967 explicit CXXPseudoDestructorExpr(EmptyShell Shell)
1968 : Expr(CXXPseudoDestructorExprClass, Shell),
1969 Base(nullptr), IsArrow(false), QualifierLoc(), ScopeType(nullptr) { }
1971 Expr *getBase() const { return cast<Expr>(Base); }
1973 /// \brief Determines whether this member expression actually had
1974 /// a C++ nested-name-specifier prior to the name of the member, e.g.,
1976 bool hasQualifier() const { return QualifierLoc.hasQualifier(); }
1978 /// \brief Retrieves the nested-name-specifier that qualifies the type name,
1979 /// with source-location information.
1980 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; }
1982 /// \brief If the member name was qualified, retrieves the
1983 /// nested-name-specifier that precedes the member name. Otherwise, returns
1985 NestedNameSpecifier *getQualifier() const {
1986 return QualifierLoc.getNestedNameSpecifier();
1989 /// \brief Determine whether this pseudo-destructor expression was written
1990 /// using an '->' (otherwise, it used a '.').
1991 bool isArrow() const { return IsArrow; }
1993 /// \brief Retrieve the location of the '.' or '->' operator.
1994 SourceLocation getOperatorLoc() const { return OperatorLoc; }
1996 /// \brief Retrieve the scope type in a qualified pseudo-destructor
1999 /// Pseudo-destructor expressions can have extra qualification within them
2000 /// that is not part of the nested-name-specifier, e.g., \c p->T::~T().
2001 /// Here, if the object type of the expression is (or may be) a scalar type,
2002 /// \p T may also be a scalar type and, therefore, cannot be part of a
2003 /// nested-name-specifier. It is stored as the "scope type" of the pseudo-
2004 /// destructor expression.
2005 TypeSourceInfo *getScopeTypeInfo() const { return ScopeType; }
2007 /// \brief Retrieve the location of the '::' in a qualified pseudo-destructor
2009 SourceLocation getColonColonLoc() const { return ColonColonLoc; }
2011 /// \brief Retrieve the location of the '~'.
2012 SourceLocation getTildeLoc() const { return TildeLoc; }
2014 /// \brief Retrieve the source location information for the type
2015 /// being destroyed.
2017 /// This type-source information is available for non-dependent
2018 /// pseudo-destructor expressions and some dependent pseudo-destructor
2019 /// expressions. Returns null if we only have the identifier for a
2020 /// dependent pseudo-destructor expression.
2021 TypeSourceInfo *getDestroyedTypeInfo() const {
2022 return DestroyedType.getTypeSourceInfo();
2025 /// \brief In a dependent pseudo-destructor expression for which we do not
2026 /// have full type information on the destroyed type, provides the name
2027 /// of the destroyed type.
2028 IdentifierInfo *getDestroyedTypeIdentifier() const {
2029 return DestroyedType.getIdentifier();
2032 /// \brief Retrieve the type being destroyed.
2033 QualType getDestroyedType() const;
2035 /// \brief Retrieve the starting location of the type being destroyed.
2036 SourceLocation getDestroyedTypeLoc() const {
2037 return DestroyedType.getLocation();
2040 /// \brief Set the name of destroyed type for a dependent pseudo-destructor
2042 void setDestroyedType(IdentifierInfo *II, SourceLocation Loc) {
2043 DestroyedType = PseudoDestructorTypeStorage(II, Loc);
2046 /// \brief Set the destroyed type.
2047 void setDestroyedType(TypeSourceInfo *Info) {
2048 DestroyedType = PseudoDestructorTypeStorage(Info);
2051 SourceLocation getLocStart() const LLVM_READONLY {return Base->getLocStart();}
2052 SourceLocation getLocEnd() const LLVM_READONLY;
2054 static bool classof(const Stmt *T) {
2055 return T->getStmtClass() == CXXPseudoDestructorExprClass;
2059 child_range children() { return child_range(&Base, &Base + 1); }
2062 /// \brief A type trait used in the implementation of various C++11 and
2063 /// Library TR1 trait templates.
2066 /// __is_pod(int) == true
2067 /// __is_enum(std::string) == false
2068 /// __is_trivially_constructible(vector<int>, int*, int*)
2070 class TypeTraitExpr : public Expr {
2071 /// \brief The location of the type trait keyword.
2074 /// \brief The location of the closing parenthesis.
2075 SourceLocation RParenLoc;
2077 // Note: The TypeSourceInfos for the arguments are allocated after the
2080 TypeTraitExpr(QualType T, SourceLocation Loc, TypeTrait Kind,
2081 ArrayRef<TypeSourceInfo *> Args,
2082 SourceLocation RParenLoc,
2085 TypeTraitExpr(EmptyShell Empty) : Expr(TypeTraitExprClass, Empty) { }
2087 /// \brief Retrieve the argument types.
2088 TypeSourceInfo **getTypeSourceInfos() {
2089 return reinterpret_cast<TypeSourceInfo **>(this+1);
2092 /// \brief Retrieve the argument types.
2093 TypeSourceInfo * const *getTypeSourceInfos() const {
2094 return reinterpret_cast<TypeSourceInfo * const*>(this+1);
2098 /// \brief Create a new type trait expression.
2099 static TypeTraitExpr *Create(const ASTContext &C, QualType T,
2100 SourceLocation Loc, TypeTrait Kind,
2101 ArrayRef<TypeSourceInfo *> Args,
2102 SourceLocation RParenLoc,
2105 static TypeTraitExpr *CreateDeserialized(const ASTContext &C,
2108 /// \brief Determine which type trait this expression uses.
2109 TypeTrait getTrait() const {
2110 return static_cast<TypeTrait>(TypeTraitExprBits.Kind);
2113 bool getValue() const {
2114 assert(!isValueDependent());
2115 return TypeTraitExprBits.Value;
2118 /// \brief Determine the number of arguments to this type trait.
2119 unsigned getNumArgs() const { return TypeTraitExprBits.NumArgs; }
2121 /// \brief Retrieve the Ith argument.
2122 TypeSourceInfo *getArg(unsigned I) const {
2123 assert(I < getNumArgs() && "Argument out-of-range");
2124 return getArgs()[I];
2127 /// \brief Retrieve the argument types.
2128 ArrayRef<TypeSourceInfo *> getArgs() const {
2129 return llvm::makeArrayRef(getTypeSourceInfos(), getNumArgs());
2132 typedef TypeSourceInfo **arg_iterator;
2133 arg_iterator arg_begin() {
2134 return getTypeSourceInfos();
2136 arg_iterator arg_end() {
2137 return getTypeSourceInfos() + getNumArgs();
2140 typedef TypeSourceInfo const * const *arg_const_iterator;
2141 arg_const_iterator arg_begin() const { return getTypeSourceInfos(); }
2142 arg_const_iterator arg_end() const {
2143 return getTypeSourceInfos() + getNumArgs();
2146 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
2147 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
2149 static bool classof(const Stmt *T) {
2150 return T->getStmtClass() == TypeTraitExprClass;
2154 child_range children() { return child_range(); }
2156 friend class ASTStmtReader;
2157 friend class ASTStmtWriter;
2161 /// \brief An Embarcadero array type trait, as used in the implementation of
2162 /// __array_rank and __array_extent.
2166 /// __array_rank(int[10][20]) == 2
2167 /// __array_extent(int, 1) == 20
2169 class ArrayTypeTraitExpr : public Expr {
2170 virtual void anchor();
2172 /// \brief The trait. An ArrayTypeTrait enum in MSVC compat unsigned.
2175 /// \brief The value of the type trait. Unspecified if dependent.
2178 /// \brief The array dimension being queried, or -1 if not used.
2181 /// \brief The location of the type trait keyword.
2184 /// \brief The location of the closing paren.
2185 SourceLocation RParen;
2187 /// \brief The type being queried.
2188 TypeSourceInfo *QueriedType;
2191 ArrayTypeTraitExpr(SourceLocation loc, ArrayTypeTrait att,
2192 TypeSourceInfo *queried, uint64_t value,
2193 Expr *dimension, SourceLocation rparen, QualType ty)
2194 : Expr(ArrayTypeTraitExprClass, ty, VK_RValue, OK_Ordinary,
2195 false, queried->getType()->isDependentType(),
2196 (queried->getType()->isInstantiationDependentType() ||
2197 (dimension && dimension->isInstantiationDependent())),
2198 queried->getType()->containsUnexpandedParameterPack()),
2199 ATT(att), Value(value), Dimension(dimension),
2200 Loc(loc), RParen(rparen), QueriedType(queried) { }
2203 explicit ArrayTypeTraitExpr(EmptyShell Empty)
2204 : Expr(ArrayTypeTraitExprClass, Empty), ATT(0), Value(false),
2207 virtual ~ArrayTypeTraitExpr() { }
2209 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
2210 SourceLocation getLocEnd() const LLVM_READONLY { return RParen; }
2212 ArrayTypeTrait getTrait() const { return static_cast<ArrayTypeTrait>(ATT); }
2214 QualType getQueriedType() const { return QueriedType->getType(); }
2216 TypeSourceInfo *getQueriedTypeSourceInfo() const { return QueriedType; }
2218 uint64_t getValue() const { assert(!isTypeDependent()); return Value; }
2220 Expr *getDimensionExpression() const { return Dimension; }
2222 static bool classof(const Stmt *T) {
2223 return T->getStmtClass() == ArrayTypeTraitExprClass;
2227 child_range children() { return child_range(); }
2229 friend class ASTStmtReader;
2232 /// \brief An expression trait intrinsic.
2236 /// __is_lvalue_expr(std::cout) == true
2237 /// __is_lvalue_expr(1) == false
2239 class ExpressionTraitExpr : public Expr {
2240 /// \brief The trait. A ExpressionTrait enum in MSVC compatible unsigned.
2242 /// \brief The value of the type trait. Unspecified if dependent.
2245 /// \brief The location of the type trait keyword.
2248 /// \brief The location of the closing paren.
2249 SourceLocation RParen;
2251 /// \brief The expression being queried.
2252 Expr* QueriedExpression;
2254 ExpressionTraitExpr(SourceLocation loc, ExpressionTrait et,
2255 Expr *queried, bool value,
2256 SourceLocation rparen, QualType resultType)
2257 : Expr(ExpressionTraitExprClass, resultType, VK_RValue, OK_Ordinary,
2258 false, // Not type-dependent
2259 // Value-dependent if the argument is type-dependent.
2260 queried->isTypeDependent(),
2261 queried->isInstantiationDependent(),
2262 queried->containsUnexpandedParameterPack()),
2263 ET(et), Value(value), Loc(loc), RParen(rparen),
2264 QueriedExpression(queried) { }
2266 explicit ExpressionTraitExpr(EmptyShell Empty)
2267 : Expr(ExpressionTraitExprClass, Empty), ET(0), Value(false),
2268 QueriedExpression() { }
2270 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
2271 SourceLocation getLocEnd() const LLVM_READONLY { return RParen; }
2273 ExpressionTrait getTrait() const { return static_cast<ExpressionTrait>(ET); }
2275 Expr *getQueriedExpression() const { return QueriedExpression; }
2277 bool getValue() const { return Value; }
2279 static bool classof(const Stmt *T) {
2280 return T->getStmtClass() == ExpressionTraitExprClass;
2284 child_range children() { return child_range(); }
2286 friend class ASTStmtReader;
2290 /// \brief A reference to an overloaded function set, either an
2291 /// \c UnresolvedLookupExpr or an \c UnresolvedMemberExpr.
2292 class OverloadExpr : public Expr {
2293 /// \brief The common name of these declarations.
2294 DeclarationNameInfo NameInfo;
2296 /// \brief The nested-name-specifier that qualifies the name, if any.
2297 NestedNameSpecifierLoc QualifierLoc;
2299 /// The results. These are undesugared, which is to say, they may
2300 /// include UsingShadowDecls. Access is relative to the naming
2302 // FIXME: Allocate this data after the OverloadExpr subclass.
2303 DeclAccessPair *Results;
2304 unsigned NumResults;
2307 /// \brief Whether the name includes info for explicit template
2308 /// keyword and arguments.
2309 bool HasTemplateKWAndArgsInfo;
2311 /// \brief Return the optional template keyword and arguments info.
2312 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo(); // defined far below.
2314 /// \brief Return the optional template keyword and arguments info.
2315 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const {
2316 return const_cast<OverloadExpr*>(this)->getTemplateKWAndArgsInfo();
2319 OverloadExpr(StmtClass K, const ASTContext &C,
2320 NestedNameSpecifierLoc QualifierLoc,
2321 SourceLocation TemplateKWLoc,
2322 const DeclarationNameInfo &NameInfo,
2323 const TemplateArgumentListInfo *TemplateArgs,
2324 UnresolvedSetIterator Begin, UnresolvedSetIterator End,
2325 bool KnownDependent,
2326 bool KnownInstantiationDependent,
2327 bool KnownContainsUnexpandedParameterPack);
2329 OverloadExpr(StmtClass K, EmptyShell Empty)
2330 : Expr(K, Empty), QualifierLoc(), Results(nullptr), NumResults(0),
2331 HasTemplateKWAndArgsInfo(false) { }
2333 void initializeResults(const ASTContext &C,
2334 UnresolvedSetIterator Begin,
2335 UnresolvedSetIterator End);
2339 OverloadExpr *Expression;
2340 bool IsAddressOfOperand;
2341 bool HasFormOfMemberPointer;
2344 /// \brief Finds the overloaded expression in the given expression \p E of
2347 /// \return the expression (which must be there) and true if it has
2348 /// the particular form of a member pointer expression
2349 static FindResult find(Expr *E) {
2350 assert(E->getType()->isSpecificBuiltinType(BuiltinType::Overload));
2354 E = E->IgnoreParens();
2355 if (isa<UnaryOperator>(E)) {
2356 assert(cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf);
2357 E = cast<UnaryOperator>(E)->getSubExpr();
2358 OverloadExpr *Ovl = cast<OverloadExpr>(E->IgnoreParens());
2360 Result.HasFormOfMemberPointer = (E == Ovl && Ovl->getQualifier());
2361 Result.IsAddressOfOperand = true;
2362 Result.Expression = Ovl;
2364 Result.HasFormOfMemberPointer = false;
2365 Result.IsAddressOfOperand = false;
2366 Result.Expression = cast<OverloadExpr>(E);
2372 /// \brief Gets the naming class of this lookup, if any.
2373 CXXRecordDecl *getNamingClass() const;
2375 typedef UnresolvedSetImpl::iterator decls_iterator;
2376 decls_iterator decls_begin() const { return UnresolvedSetIterator(Results); }
2377 decls_iterator decls_end() const {
2378 return UnresolvedSetIterator(Results + NumResults);
2380 llvm::iterator_range<decls_iterator> decls() const {
2381 return llvm::iterator_range<decls_iterator>(decls_begin(), decls_end());
2384 /// \brief Gets the number of declarations in the unresolved set.
2385 unsigned getNumDecls() const { return NumResults; }
2387 /// \brief Gets the full name info.
2388 const DeclarationNameInfo &getNameInfo() const { return NameInfo; }
2390 /// \brief Gets the name looked up.
2391 DeclarationName getName() const { return NameInfo.getName(); }
2393 /// \brief Gets the location of the name.
2394 SourceLocation getNameLoc() const { return NameInfo.getLoc(); }
2396 /// \brief Fetches the nested-name qualifier, if one was given.
2397 NestedNameSpecifier *getQualifier() const {
2398 return QualifierLoc.getNestedNameSpecifier();
2401 /// \brief Fetches the nested-name qualifier with source-location
2402 /// information, if one was given.
2403 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; }
2405 /// \brief Retrieve the location of the template keyword preceding
2406 /// this name, if any.
2407 SourceLocation getTemplateKeywordLoc() const {
2408 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2409 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc();
2412 /// \brief Retrieve the location of the left angle bracket starting the
2413 /// explicit template argument list following the name, if any.
2414 SourceLocation getLAngleLoc() const {
2415 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2416 return getTemplateKWAndArgsInfo()->LAngleLoc;
2419 /// \brief Retrieve the location of the right angle bracket ending the
2420 /// explicit template argument list following the name, if any.
2421 SourceLocation getRAngleLoc() const {
2422 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2423 return getTemplateKWAndArgsInfo()->RAngleLoc;
2426 /// \brief Determines whether the name was preceded by the template keyword.
2427 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }
2429 /// \brief Determines whether this expression had explicit template arguments.
2430 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }
2432 // Note that, inconsistently with the explicit-template-argument AST
2433 // nodes, users are *forbidden* from calling these methods on objects
2434 // without explicit template arguments.
2436 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() {
2437 assert(hasExplicitTemplateArgs());
2438 return *getTemplateKWAndArgsInfo();
2441 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const {
2442 return const_cast<OverloadExpr*>(this)->getExplicitTemplateArgs();
2445 TemplateArgumentLoc const *getTemplateArgs() const {
2446 return getExplicitTemplateArgs().getTemplateArgs();
2449 unsigned getNumTemplateArgs() const {
2450 return getExplicitTemplateArgs().NumTemplateArgs;
2453 /// \brief Copies the template arguments into the given structure.
2454 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
2455 getExplicitTemplateArgs().copyInto(List);
2458 /// \brief Retrieves the optional explicit template arguments.
2460 /// This points to the same data as getExplicitTemplateArgs(), but
2461 /// returns null if there are no explicit template arguments.
2462 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const {
2463 if (!hasExplicitTemplateArgs()) return nullptr;
2464 return &getExplicitTemplateArgs();
2467 static bool classof(const Stmt *T) {
2468 return T->getStmtClass() == UnresolvedLookupExprClass ||
2469 T->getStmtClass() == UnresolvedMemberExprClass;
2472 friend class ASTStmtReader;
2473 friend class ASTStmtWriter;
2476 /// \brief A reference to a name which we were able to look up during
2477 /// parsing but could not resolve to a specific declaration.
2479 /// This arises in several ways:
2480 /// * we might be waiting for argument-dependent lookup;
2481 /// * the name might resolve to an overloaded function;
2483 /// * the lookup might have included a function template.
2485 /// These never include UnresolvedUsingValueDecls, which are always class
2486 /// members and therefore appear only in UnresolvedMemberLookupExprs.
2487 class UnresolvedLookupExpr : public OverloadExpr {
2488 /// True if these lookup results should be extended by
2489 /// argument-dependent lookup if this is the operand of a function
2493 /// True if these lookup results are overloaded. This is pretty
2494 /// trivially rederivable if we urgently need to kill this field.
2497 /// The naming class (C++ [class.access.base]p5) of the lookup, if
2498 /// any. This can generally be recalculated from the context chain,
2499 /// but that can be fairly expensive for unqualified lookups. If we
2500 /// want to improve memory use here, this could go in a union
2501 /// against the qualified-lookup bits.
2502 CXXRecordDecl *NamingClass;
2504 UnresolvedLookupExpr(const ASTContext &C,
2505 CXXRecordDecl *NamingClass,
2506 NestedNameSpecifierLoc QualifierLoc,
2507 SourceLocation TemplateKWLoc,
2508 const DeclarationNameInfo &NameInfo,
2509 bool RequiresADL, bool Overloaded,
2510 const TemplateArgumentListInfo *TemplateArgs,
2511 UnresolvedSetIterator Begin, UnresolvedSetIterator End)
2512 : OverloadExpr(UnresolvedLookupExprClass, C, QualifierLoc, TemplateKWLoc,
2513 NameInfo, TemplateArgs, Begin, End, false, false, false),
2514 RequiresADL(RequiresADL),
2515 Overloaded(Overloaded), NamingClass(NamingClass)
2518 UnresolvedLookupExpr(EmptyShell Empty)
2519 : OverloadExpr(UnresolvedLookupExprClass, Empty),
2520 RequiresADL(false), Overloaded(false), NamingClass(nullptr)
2523 friend class ASTStmtReader;
2526 static UnresolvedLookupExpr *Create(const ASTContext &C,
2527 CXXRecordDecl *NamingClass,
2528 NestedNameSpecifierLoc QualifierLoc,
2529 const DeclarationNameInfo &NameInfo,
2530 bool ADL, bool Overloaded,
2531 UnresolvedSetIterator Begin,
2532 UnresolvedSetIterator End) {
2533 return new(C) UnresolvedLookupExpr(C, NamingClass, QualifierLoc,
2534 SourceLocation(), NameInfo,
2535 ADL, Overloaded, nullptr, Begin, End);
2538 static UnresolvedLookupExpr *Create(const ASTContext &C,
2539 CXXRecordDecl *NamingClass,
2540 NestedNameSpecifierLoc QualifierLoc,
2541 SourceLocation TemplateKWLoc,
2542 const DeclarationNameInfo &NameInfo,
2544 const TemplateArgumentListInfo *Args,
2545 UnresolvedSetIterator Begin,
2546 UnresolvedSetIterator End);
2548 static UnresolvedLookupExpr *CreateEmpty(const ASTContext &C,
2549 bool HasTemplateKWAndArgsInfo,
2550 unsigned NumTemplateArgs);
2552 /// True if this declaration should be extended by
2553 /// argument-dependent lookup.
2554 bool requiresADL() const { return RequiresADL; }
2556 /// True if this lookup is overloaded.
2557 bool isOverloaded() const { return Overloaded; }
2559 /// Gets the 'naming class' (in the sense of C++0x
2560 /// [class.access.base]p5) of the lookup. This is the scope
2561 /// that was looked in to find these results.
2562 CXXRecordDecl *getNamingClass() const { return NamingClass; }
2564 SourceLocation getLocStart() const LLVM_READONLY {
2565 if (NestedNameSpecifierLoc l = getQualifierLoc())
2566 return l.getBeginLoc();
2567 return getNameInfo().getLocStart();
2569 SourceLocation getLocEnd() const LLVM_READONLY {
2570 if (hasExplicitTemplateArgs())
2571 return getRAngleLoc();
2572 return getNameInfo().getLocEnd();
2575 child_range children() { return child_range(); }
2577 static bool classof(const Stmt *T) {
2578 return T->getStmtClass() == UnresolvedLookupExprClass;
2582 /// \brief A qualified reference to a name whose declaration cannot
2583 /// yet be resolved.
2585 /// DependentScopeDeclRefExpr is similar to DeclRefExpr in that
2586 /// it expresses a reference to a declaration such as
2587 /// X<T>::value. The difference, however, is that an
2588 /// DependentScopeDeclRefExpr node is used only within C++ templates when
2589 /// the qualification (e.g., X<T>::) refers to a dependent type. In
2590 /// this case, X<T>::value cannot resolve to a declaration because the
2591 /// declaration will differ from one instantiation of X<T> to the
2592 /// next. Therefore, DependentScopeDeclRefExpr keeps track of the
2593 /// qualifier (X<T>::) and the name of the entity being referenced
2594 /// ("value"). Such expressions will instantiate to a DeclRefExpr once the
2595 /// declaration can be found.
2596 class DependentScopeDeclRefExpr : public Expr {
2597 /// \brief The nested-name-specifier that qualifies this unresolved
2598 /// declaration name.
2599 NestedNameSpecifierLoc QualifierLoc;
2601 /// \brief The name of the entity we will be referencing.
2602 DeclarationNameInfo NameInfo;
2604 /// \brief Whether the name includes info for explicit template
2605 /// keyword and arguments.
2606 bool HasTemplateKWAndArgsInfo;
2608 /// \brief Return the optional template keyword and arguments info.
2609 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() {
2610 if (!HasTemplateKWAndArgsInfo) return nullptr;
2611 return reinterpret_cast<ASTTemplateKWAndArgsInfo*>(this + 1);
2613 /// \brief Return the optional template keyword and arguments info.
2614 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const {
2615 return const_cast<DependentScopeDeclRefExpr*>(this)
2616 ->getTemplateKWAndArgsInfo();
2619 DependentScopeDeclRefExpr(QualType T,
2620 NestedNameSpecifierLoc QualifierLoc,
2621 SourceLocation TemplateKWLoc,
2622 const DeclarationNameInfo &NameInfo,
2623 const TemplateArgumentListInfo *Args);
2626 static DependentScopeDeclRefExpr *Create(const ASTContext &C,
2627 NestedNameSpecifierLoc QualifierLoc,
2628 SourceLocation TemplateKWLoc,
2629 const DeclarationNameInfo &NameInfo,
2630 const TemplateArgumentListInfo *TemplateArgs);
2632 static DependentScopeDeclRefExpr *CreateEmpty(const ASTContext &C,
2633 bool HasTemplateKWAndArgsInfo,
2634 unsigned NumTemplateArgs);
2636 /// \brief Retrieve the name that this expression refers to.
2637 const DeclarationNameInfo &getNameInfo() const { return NameInfo; }
2639 /// \brief Retrieve the name that this expression refers to.
2640 DeclarationName getDeclName() const { return NameInfo.getName(); }
2642 /// \brief Retrieve the location of the name within the expression.
2644 /// For example, in "X<T>::value" this is the location of "value".
2645 SourceLocation getLocation() const { return NameInfo.getLoc(); }
2647 /// \brief Retrieve the nested-name-specifier that qualifies the
2648 /// name, with source location information.
2649 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; }
2651 /// \brief Retrieve the nested-name-specifier that qualifies this
2653 NestedNameSpecifier *getQualifier() const {
2654 return QualifierLoc.getNestedNameSpecifier();
2657 /// \brief Retrieve the location of the template keyword preceding
2658 /// this name, if any.
2659 SourceLocation getTemplateKeywordLoc() const {
2660 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2661 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc();
2664 /// \brief Retrieve the location of the left angle bracket starting the
2665 /// explicit template argument list following the name, if any.
2666 SourceLocation getLAngleLoc() const {
2667 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2668 return getTemplateKWAndArgsInfo()->LAngleLoc;
2671 /// \brief Retrieve the location of the right angle bracket ending the
2672 /// explicit template argument list following the name, if any.
2673 SourceLocation getRAngleLoc() const {
2674 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2675 return getTemplateKWAndArgsInfo()->RAngleLoc;
2678 /// Determines whether the name was preceded by the template keyword.
2679 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }
2681 /// Determines whether this lookup had explicit template arguments.
2682 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }
2684 // Note that, inconsistently with the explicit-template-argument AST
2685 // nodes, users are *forbidden* from calling these methods on objects
2686 // without explicit template arguments.
2688 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() {
2689 assert(hasExplicitTemplateArgs());
2690 return *reinterpret_cast<ASTTemplateArgumentListInfo*>(this + 1);
2693 /// Gets a reference to the explicit template argument list.
2694 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const {
2695 assert(hasExplicitTemplateArgs());
2696 return *reinterpret_cast<const ASTTemplateArgumentListInfo*>(this + 1);
2699 /// \brief Retrieves the optional explicit template arguments.
2701 /// This points to the same data as getExplicitTemplateArgs(), but
2702 /// returns null if there are no explicit template arguments.
2703 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const {
2704 if (!hasExplicitTemplateArgs()) return nullptr;
2705 return &getExplicitTemplateArgs();
2708 /// \brief Copies the template arguments (if present) into the given
2710 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
2711 getExplicitTemplateArgs().copyInto(List);
2714 TemplateArgumentLoc const *getTemplateArgs() const {
2715 return getExplicitTemplateArgs().getTemplateArgs();
2718 unsigned getNumTemplateArgs() const {
2719 return getExplicitTemplateArgs().NumTemplateArgs;
2722 /// Note: getLocStart() is the start of the whole DependentScopeDeclRefExpr,
2723 /// and differs from getLocation().getStart().
2724 SourceLocation getLocStart() const LLVM_READONLY {
2725 return QualifierLoc.getBeginLoc();
2727 SourceLocation getLocEnd() const LLVM_READONLY {
2728 if (hasExplicitTemplateArgs())
2729 return getRAngleLoc();
2730 return getLocation();
2733 static bool classof(const Stmt *T) {
2734 return T->getStmtClass() == DependentScopeDeclRefExprClass;
2737 child_range children() { return child_range(); }
2739 friend class ASTStmtReader;
2740 friend class ASTStmtWriter;
2743 /// Represents an expression -- generally a full-expression -- that
2744 /// introduces cleanups to be run at the end of the sub-expression's
2745 /// evaluation. The most common source of expression-introduced
2746 /// cleanups is temporary objects in C++, but several other kinds of
2747 /// expressions can create cleanups, including basically every
2748 /// call in ARC that returns an Objective-C pointer.
2750 /// This expression also tracks whether the sub-expression contains a
2751 /// potentially-evaluated block literal. The lifetime of a block
2752 /// literal is the extent of the enclosing scope.
2753 class ExprWithCleanups : public Expr {
2755 /// The type of objects that are kept in the cleanup.
2756 /// It's useful to remember the set of blocks; we could also
2757 /// remember the set of temporaries, but there's currently
2759 typedef BlockDecl *CleanupObject;
2764 ExprWithCleanups(EmptyShell, unsigned NumObjects);
2765 ExprWithCleanups(Expr *SubExpr, ArrayRef<CleanupObject> Objects);
2767 CleanupObject *getObjectsBuffer() {
2768 return reinterpret_cast<CleanupObject*>(this + 1);
2770 const CleanupObject *getObjectsBuffer() const {
2771 return reinterpret_cast<const CleanupObject*>(this + 1);
2773 friend class ASTStmtReader;
2776 static ExprWithCleanups *Create(const ASTContext &C, EmptyShell empty,
2777 unsigned numObjects);
2779 static ExprWithCleanups *Create(const ASTContext &C, Expr *subexpr,
2780 ArrayRef<CleanupObject> objects);
2782 ArrayRef<CleanupObject> getObjects() const {
2783 return llvm::makeArrayRef(getObjectsBuffer(), getNumObjects());
2786 unsigned getNumObjects() const { return ExprWithCleanupsBits.NumObjects; }
2788 CleanupObject getObject(unsigned i) const {
2789 assert(i < getNumObjects() && "Index out of range");
2790 return getObjects()[i];
2793 Expr *getSubExpr() { return cast<Expr>(SubExpr); }
2794 const Expr *getSubExpr() const { return cast<Expr>(SubExpr); }
2796 /// As with any mutator of the AST, be very careful
2797 /// when modifying an existing AST to preserve its invariants.
2798 void setSubExpr(Expr *E) { SubExpr = E; }
2800 SourceLocation getLocStart() const LLVM_READONLY {
2801 return SubExpr->getLocStart();
2803 SourceLocation getLocEnd() const LLVM_READONLY { return SubExpr->getLocEnd();}
2805 // Implement isa/cast/dyncast/etc.
2806 static bool classof(const Stmt *T) {
2807 return T->getStmtClass() == ExprWithCleanupsClass;
2811 child_range children() { return child_range(&SubExpr, &SubExpr + 1); }
2814 /// \brief Describes an explicit type conversion that uses functional
2815 /// notion but could not be resolved because one or more arguments are
2818 /// The explicit type conversions expressed by
2819 /// CXXUnresolvedConstructExpr have the form <tt>T(a1, a2, ..., aN)</tt>,
2820 /// where \c T is some type and \c a1, \c a2, ..., \c aN are values, and
2821 /// either \c T is a dependent type or one or more of the <tt>a</tt>'s is
2822 /// type-dependent. For example, this would occur in a template such
2826 /// template<typename T, typename A1>
2827 /// inline T make_a(const A1& a1) {
2832 /// When the returned expression is instantiated, it may resolve to a
2833 /// constructor call, conversion function call, or some kind of type
2835 class CXXUnresolvedConstructExpr : public Expr {
2836 /// \brief The type being constructed.
2837 TypeSourceInfo *Type;
2839 /// \brief The location of the left parentheses ('(').
2840 SourceLocation LParenLoc;
2842 /// \brief The location of the right parentheses (')').
2843 SourceLocation RParenLoc;
2845 /// \brief The number of arguments used to construct the type.
2848 CXXUnresolvedConstructExpr(TypeSourceInfo *Type,
2849 SourceLocation LParenLoc,
2850 ArrayRef<Expr*> Args,
2851 SourceLocation RParenLoc);
2853 CXXUnresolvedConstructExpr(EmptyShell Empty, unsigned NumArgs)
2854 : Expr(CXXUnresolvedConstructExprClass, Empty), Type(), NumArgs(NumArgs) { }
2856 friend class ASTStmtReader;
2859 static CXXUnresolvedConstructExpr *Create(const ASTContext &C,
2860 TypeSourceInfo *Type,
2861 SourceLocation LParenLoc,
2862 ArrayRef<Expr*> Args,
2863 SourceLocation RParenLoc);
2865 static CXXUnresolvedConstructExpr *CreateEmpty(const ASTContext &C,
2868 /// \brief Retrieve the type that is being constructed, as specified
2869 /// in the source code.
2870 QualType getTypeAsWritten() const { return Type->getType(); }
2872 /// \brief Retrieve the type source information for the type being
2874 TypeSourceInfo *getTypeSourceInfo() const { return Type; }
2876 /// \brief Retrieve the location of the left parentheses ('(') that
2877 /// precedes the argument list.
2878 SourceLocation getLParenLoc() const { return LParenLoc; }
2879 void setLParenLoc(SourceLocation L) { LParenLoc = L; }
2881 /// \brief Retrieve the location of the right parentheses (')') that
2882 /// follows the argument list.
2883 SourceLocation getRParenLoc() const { return RParenLoc; }
2884 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
2886 /// \brief Retrieve the number of arguments.
2887 unsigned arg_size() const { return NumArgs; }
2889 typedef Expr** arg_iterator;
2890 arg_iterator arg_begin() { return reinterpret_cast<Expr**>(this + 1); }
2891 arg_iterator arg_end() { return arg_begin() + NumArgs; }
2893 typedef const Expr* const * const_arg_iterator;
2894 const_arg_iterator arg_begin() const {
2895 return reinterpret_cast<const Expr* const *>(this + 1);
2897 const_arg_iterator arg_end() const {
2898 return arg_begin() + NumArgs;
2901 Expr *getArg(unsigned I) {
2902 assert(I < NumArgs && "Argument index out-of-range");
2903 return *(arg_begin() + I);
2906 const Expr *getArg(unsigned I) const {
2907 assert(I < NumArgs && "Argument index out-of-range");
2908 return *(arg_begin() + I);
2911 void setArg(unsigned I, Expr *E) {
2912 assert(I < NumArgs && "Argument index out-of-range");
2913 *(arg_begin() + I) = E;
2916 SourceLocation getLocStart() const LLVM_READONLY;
2917 SourceLocation getLocEnd() const LLVM_READONLY {
2918 if (!RParenLoc.isValid() && NumArgs > 0)
2919 return getArg(NumArgs - 1)->getLocEnd();
2923 static bool classof(const Stmt *T) {
2924 return T->getStmtClass() == CXXUnresolvedConstructExprClass;
2928 child_range children() {
2929 Stmt **begin = reinterpret_cast<Stmt**>(this+1);
2930 return child_range(begin, begin + NumArgs);
2934 /// \brief Represents a C++ member access expression where the actual
2935 /// member referenced could not be resolved because the base
2936 /// expression or the member name was dependent.
2938 /// Like UnresolvedMemberExprs, these can be either implicit or
2939 /// explicit accesses. It is only possible to get one of these with
2940 /// an implicit access if a qualifier is provided.
2941 class CXXDependentScopeMemberExpr : public Expr {
2942 /// \brief The expression for the base pointer or class reference,
2943 /// e.g., the \c x in x.f. Can be null in implicit accesses.
2946 /// \brief The type of the base expression. Never null, even for
2947 /// implicit accesses.
2950 /// \brief Whether this member expression used the '->' operator or
2951 /// the '.' operator.
2954 /// \brief Whether this member expression has info for explicit template
2955 /// keyword and arguments.
2956 bool HasTemplateKWAndArgsInfo : 1;
2958 /// \brief The location of the '->' or '.' operator.
2959 SourceLocation OperatorLoc;
2961 /// \brief The nested-name-specifier that precedes the member name, if any.
2962 NestedNameSpecifierLoc QualifierLoc;
2964 /// \brief In a qualified member access expression such as t->Base::f, this
2965 /// member stores the resolves of name lookup in the context of the member
2966 /// access expression, to be used at instantiation time.
2968 /// FIXME: This member, along with the QualifierLoc, could
2969 /// be stuck into a structure that is optionally allocated at the end of
2970 /// the CXXDependentScopeMemberExpr, to save space in the common case.
2971 NamedDecl *FirstQualifierFoundInScope;
2973 /// \brief The member to which this member expression refers, which
2974 /// can be name, overloaded operator, or destructor.
2976 /// FIXME: could also be a template-id
2977 DeclarationNameInfo MemberNameInfo;
2979 /// \brief Return the optional template keyword and arguments info.
2980 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() {
2981 if (!HasTemplateKWAndArgsInfo) return nullptr;
2982 return reinterpret_cast<ASTTemplateKWAndArgsInfo*>(this + 1);
2984 /// \brief Return the optional template keyword and arguments info.
2985 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const {
2986 return const_cast<CXXDependentScopeMemberExpr*>(this)
2987 ->getTemplateKWAndArgsInfo();
2990 CXXDependentScopeMemberExpr(const ASTContext &C, Expr *Base,
2991 QualType BaseType, bool IsArrow,
2992 SourceLocation OperatorLoc,
2993 NestedNameSpecifierLoc QualifierLoc,
2994 SourceLocation TemplateKWLoc,
2995 NamedDecl *FirstQualifierFoundInScope,
2996 DeclarationNameInfo MemberNameInfo,
2997 const TemplateArgumentListInfo *TemplateArgs);
3000 CXXDependentScopeMemberExpr(const ASTContext &C, Expr *Base,
3001 QualType BaseType, bool IsArrow,
3002 SourceLocation OperatorLoc,
3003 NestedNameSpecifierLoc QualifierLoc,
3004 NamedDecl *FirstQualifierFoundInScope,
3005 DeclarationNameInfo MemberNameInfo);
3007 static CXXDependentScopeMemberExpr *
3008 Create(const ASTContext &C, Expr *Base, QualType BaseType, bool IsArrow,
3009 SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc,
3010 SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierFoundInScope,
3011 DeclarationNameInfo MemberNameInfo,
3012 const TemplateArgumentListInfo *TemplateArgs);
3014 static CXXDependentScopeMemberExpr *
3015 CreateEmpty(const ASTContext &C, bool HasTemplateKWAndArgsInfo,
3016 unsigned NumTemplateArgs);
3018 /// \brief True if this is an implicit access, i.e. one in which the
3019 /// member being accessed was not written in the source. The source
3020 /// location of the operator is invalid in this case.
3021 bool isImplicitAccess() const;
3023 /// \brief Retrieve the base object of this member expressions,
3024 /// e.g., the \c x in \c x.m.
3025 Expr *getBase() const {
3026 assert(!isImplicitAccess());
3027 return cast<Expr>(Base);
3030 QualType getBaseType() const { return BaseType; }
3032 /// \brief Determine whether this member expression used the '->'
3033 /// operator; otherwise, it used the '.' operator.
3034 bool isArrow() const { return IsArrow; }
3036 /// \brief Retrieve the location of the '->' or '.' operator.
3037 SourceLocation getOperatorLoc() const { return OperatorLoc; }
3039 /// \brief Retrieve the nested-name-specifier that qualifies the member
3041 NestedNameSpecifier *getQualifier() const {
3042 return QualifierLoc.getNestedNameSpecifier();
3045 /// \brief Retrieve the nested-name-specifier that qualifies the member
3046 /// name, with source location information.
3047 NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; }
3050 /// \brief Retrieve the first part of the nested-name-specifier that was
3051 /// found in the scope of the member access expression when the member access
3052 /// was initially parsed.
3054 /// This function only returns a useful result when member access expression
3055 /// uses a qualified member name, e.g., "x.Base::f". Here, the declaration
3056 /// returned by this function describes what was found by unqualified name
3057 /// lookup for the identifier "Base" within the scope of the member access
3058 /// expression itself. At template instantiation time, this information is
3059 /// combined with the results of name lookup into the type of the object
3060 /// expression itself (the class type of x).
3061 NamedDecl *getFirstQualifierFoundInScope() const {
3062 return FirstQualifierFoundInScope;
3065 /// \brief Retrieve the name of the member that this expression
3067 const DeclarationNameInfo &getMemberNameInfo() const {
3068 return MemberNameInfo;
3071 /// \brief Retrieve the name of the member that this expression
3073 DeclarationName getMember() const { return MemberNameInfo.getName(); }
3075 // \brief Retrieve the location of the name of the member that this
3076 // expression refers to.
3077 SourceLocation getMemberLoc() const { return MemberNameInfo.getLoc(); }
3079 /// \brief Retrieve the location of the template keyword preceding the
3080 /// member name, if any.
3081 SourceLocation getTemplateKeywordLoc() const {
3082 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
3083 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc();
3086 /// \brief Retrieve the location of the left angle bracket starting the
3087 /// explicit template argument list following the member name, if any.
3088 SourceLocation getLAngleLoc() const {
3089 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
3090 return getTemplateKWAndArgsInfo()->LAngleLoc;
3093 /// \brief Retrieve the location of the right angle bracket ending the
3094 /// explicit template argument list following the member name, if any.
3095 SourceLocation getRAngleLoc() const {
3096 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
3097 return getTemplateKWAndArgsInfo()->RAngleLoc;
3100 /// Determines whether the member name was preceded by the template keyword.
3101 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }
3103 /// \brief Determines whether this member expression actually had a C++
3104 /// template argument list explicitly specified, e.g., x.f<int>.
3105 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }
3107 /// \brief Retrieve the explicit template argument list that followed the
3108 /// member template name, if any.
3109 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() {
3110 assert(hasExplicitTemplateArgs());
3111 return *reinterpret_cast<ASTTemplateArgumentListInfo *>(this + 1);
3114 /// \brief Retrieve the explicit template argument list that followed the
3115 /// member template name, if any.
3116 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const {
3117 return const_cast<CXXDependentScopeMemberExpr *>(this)
3118 ->getExplicitTemplateArgs();
3121 /// \brief Retrieves the optional explicit template arguments.
3123 /// This points to the same data as getExplicitTemplateArgs(), but
3124 /// returns null if there are no explicit template arguments.
3125 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const {
3126 if (!hasExplicitTemplateArgs()) return nullptr;
3127 return &getExplicitTemplateArgs();
3130 /// \brief Copies the template arguments (if present) into the given
3132 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
3133 getExplicitTemplateArgs().copyInto(List);
3136 /// \brief Initializes the template arguments using the given structure.
3137 void initializeTemplateArgumentsFrom(const TemplateArgumentListInfo &List) {
3138 getExplicitTemplateArgs().initializeFrom(List);
3141 /// \brief Retrieve the template arguments provided as part of this
3143 const TemplateArgumentLoc *getTemplateArgs() const {
3144 return getExplicitTemplateArgs().getTemplateArgs();
3147 /// \brief Retrieve the number of template arguments provided as part of this
3149 unsigned getNumTemplateArgs() const {
3150 return getExplicitTemplateArgs().NumTemplateArgs;
3153 SourceLocation getLocStart() const LLVM_READONLY {
3154 if (!isImplicitAccess())
3155 return Base->getLocStart();
3157 return getQualifierLoc().getBeginLoc();
3158 return MemberNameInfo.getBeginLoc();
3161 SourceLocation getLocEnd() const LLVM_READONLY {
3162 if (hasExplicitTemplateArgs())
3163 return getRAngleLoc();
3164 return MemberNameInfo.getEndLoc();
3167 static bool classof(const Stmt *T) {
3168 return T->getStmtClass() == CXXDependentScopeMemberExprClass;
3172 child_range children() {
3173 if (isImplicitAccess()) return child_range();
3174 return child_range(&Base, &Base + 1);
3177 friend class ASTStmtReader;
3178 friend class ASTStmtWriter;
3181 /// \brief Represents a C++ member access expression for which lookup
3182 /// produced a set of overloaded functions.
3184 /// The member access may be explicit or implicit:
3188 /// int explicitAccess() { return this->a + this->A::b; }
3189 /// int implicitAccess() { return a + A::b; }
3193 /// In the final AST, an explicit access always becomes a MemberExpr.
3194 /// An implicit access may become either a MemberExpr or a
3195 /// DeclRefExpr, depending on whether the member is static.
3196 class UnresolvedMemberExpr : public OverloadExpr {
3197 /// \brief Whether this member expression used the '->' operator or
3198 /// the '.' operator.
3201 /// \brief Whether the lookup results contain an unresolved using
3203 bool HasUnresolvedUsing : 1;
3205 /// \brief The expression for the base pointer or class reference,
3206 /// e.g., the \c x in x.f.
3208 /// This can be null if this is an 'unbased' member expression.
3211 /// \brief The type of the base expression; never null.
3214 /// \brief The location of the '->' or '.' operator.
3215 SourceLocation OperatorLoc;
3217 UnresolvedMemberExpr(const ASTContext &C, bool HasUnresolvedUsing,
3218 Expr *Base, QualType BaseType, bool IsArrow,
3219 SourceLocation OperatorLoc,
3220 NestedNameSpecifierLoc QualifierLoc,
3221 SourceLocation TemplateKWLoc,
3222 const DeclarationNameInfo &MemberNameInfo,
3223 const TemplateArgumentListInfo *TemplateArgs,
3224 UnresolvedSetIterator Begin, UnresolvedSetIterator End);
3226 UnresolvedMemberExpr(EmptyShell Empty)
3227 : OverloadExpr(UnresolvedMemberExprClass, Empty), IsArrow(false),
3228 HasUnresolvedUsing(false), Base(nullptr) { }
3230 friend class ASTStmtReader;
3233 static UnresolvedMemberExpr *
3234 Create(const ASTContext &C, bool HasUnresolvedUsing,
3235 Expr *Base, QualType BaseType, bool IsArrow,
3236 SourceLocation OperatorLoc,
3237 NestedNameSpecifierLoc QualifierLoc,
3238 SourceLocation TemplateKWLoc,
3239 const DeclarationNameInfo &MemberNameInfo,
3240 const TemplateArgumentListInfo *TemplateArgs,
3241 UnresolvedSetIterator Begin, UnresolvedSetIterator End);
3243 static UnresolvedMemberExpr *
3244 CreateEmpty(const ASTContext &C, bool HasTemplateKWAndArgsInfo,
3245 unsigned NumTemplateArgs);
3247 /// \brief True if this is an implicit access, i.e., one in which the
3248 /// member being accessed was not written in the source.
3250 /// The source location of the operator is invalid in this case.
3251 bool isImplicitAccess() const;
3253 /// \brief Retrieve the base object of this member expressions,
3254 /// e.g., the \c x in \c x.m.
3256 assert(!isImplicitAccess());
3257 return cast<Expr>(Base);
3259 const Expr *getBase() const {
3260 assert(!isImplicitAccess());
3261 return cast<Expr>(Base);
3264 QualType getBaseType() const { return BaseType; }
3266 /// \brief Determine whether the lookup results contain an unresolved using
3268 bool hasUnresolvedUsing() const { return HasUnresolvedUsing; }
3270 /// \brief Determine whether this member expression used the '->'
3271 /// operator; otherwise, it used the '.' operator.
3272 bool isArrow() const { return IsArrow; }
3274 /// \brief Retrieve the location of the '->' or '.' operator.
3275 SourceLocation getOperatorLoc() const { return OperatorLoc; }
3277 /// \brief Retrieve the naming class of this lookup.
3278 CXXRecordDecl *getNamingClass() const;
3280 /// \brief Retrieve the full name info for the member that this expression
3282 const DeclarationNameInfo &getMemberNameInfo() const { return getNameInfo(); }
3284 /// \brief Retrieve the name of the member that this expression
3286 DeclarationName getMemberName() const { return getName(); }
3288 // \brief Retrieve the location of the name of the member that this
3289 // expression refers to.
3290 SourceLocation getMemberLoc() const { return getNameLoc(); }
3292 // \brief Return the preferred location (the member name) for the arrow when
3293 // diagnosing a problem with this expression.
3294 SourceLocation getExprLoc() const LLVM_READONLY { return getMemberLoc(); }
3296 SourceLocation getLocStart() const LLVM_READONLY {
3297 if (!isImplicitAccess())
3298 return Base->getLocStart();
3299 if (NestedNameSpecifierLoc l = getQualifierLoc())
3300 return l.getBeginLoc();
3301 return getMemberNameInfo().getLocStart();
3303 SourceLocation getLocEnd() const LLVM_READONLY {
3304 if (hasExplicitTemplateArgs())
3305 return getRAngleLoc();
3306 return getMemberNameInfo().getLocEnd();
3309 static bool classof(const Stmt *T) {
3310 return T->getStmtClass() == UnresolvedMemberExprClass;
3314 child_range children() {
3315 if (isImplicitAccess()) return child_range();
3316 return child_range(&Base, &Base + 1);
3320 /// \brief Represents a C++11 noexcept expression (C++ [expr.unary.noexcept]).
3322 /// The noexcept expression tests whether a given expression might throw. Its
3323 /// result is a boolean constant.
3324 class CXXNoexceptExpr : public Expr {
3329 friend class ASTStmtReader;
3332 CXXNoexceptExpr(QualType Ty, Expr *Operand, CanThrowResult Val,
3333 SourceLocation Keyword, SourceLocation RParen)
3334 : Expr(CXXNoexceptExprClass, Ty, VK_RValue, OK_Ordinary,
3335 /*TypeDependent*/false,
3336 /*ValueDependent*/Val == CT_Dependent,
3337 Val == CT_Dependent || Operand->isInstantiationDependent(),
3338 Operand->containsUnexpandedParameterPack()),
3339 Value(Val == CT_Cannot), Operand(Operand), Range(Keyword, RParen)
3342 CXXNoexceptExpr(EmptyShell Empty)
3343 : Expr(CXXNoexceptExprClass, Empty)
3346 Expr *getOperand() const { return static_cast<Expr*>(Operand); }
3348 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); }
3349 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); }
3350 SourceRange getSourceRange() const LLVM_READONLY { return Range; }
3352 bool getValue() const { return Value; }
3354 static bool classof(const Stmt *T) {
3355 return T->getStmtClass() == CXXNoexceptExprClass;
3359 child_range children() { return child_range(&Operand, &Operand + 1); }
3362 /// \brief Represents a C++11 pack expansion that produces a sequence of
3365 /// A pack expansion expression contains a pattern (which itself is an
3366 /// expression) followed by an ellipsis. For example:
3369 /// template<typename F, typename ...Types>
3370 /// void forward(F f, Types &&...args) {
3371 /// f(static_cast<Types&&>(args)...);
3375 /// Here, the argument to the function object \c f is a pack expansion whose
3376 /// pattern is \c static_cast<Types&&>(args). When the \c forward function
3377 /// template is instantiated, the pack expansion will instantiate to zero or
3378 /// or more function arguments to the function object \c f.
3379 class PackExpansionExpr : public Expr {
3380 SourceLocation EllipsisLoc;
3382 /// \brief The number of expansions that will be produced by this pack
3383 /// expansion expression, if known.
3385 /// When zero, the number of expansions is not known. Otherwise, this value
3386 /// is the number of expansions + 1.
3387 unsigned NumExpansions;
3391 friend class ASTStmtReader;
3392 friend class ASTStmtWriter;
3395 PackExpansionExpr(QualType T, Expr *Pattern, SourceLocation EllipsisLoc,
3396 Optional<unsigned> NumExpansions)
3397 : Expr(PackExpansionExprClass, T, Pattern->getValueKind(),
3398 Pattern->getObjectKind(), /*TypeDependent=*/true,
3399 /*ValueDependent=*/true, /*InstantiationDependent=*/true,
3400 /*ContainsUnexpandedParameterPack=*/false),
3401 EllipsisLoc(EllipsisLoc),
3402 NumExpansions(NumExpansions? *NumExpansions + 1 : 0),
3403 Pattern(Pattern) { }
3405 PackExpansionExpr(EmptyShell Empty) : Expr(PackExpansionExprClass, Empty) { }
3407 /// \brief Retrieve the pattern of the pack expansion.
3408 Expr *getPattern() { return reinterpret_cast<Expr *>(Pattern); }
3410 /// \brief Retrieve the pattern of the pack expansion.
3411 const Expr *getPattern() const { return reinterpret_cast<Expr *>(Pattern); }
3413 /// \brief Retrieve the location of the ellipsis that describes this pack
3415 SourceLocation getEllipsisLoc() const { return EllipsisLoc; }
3417 /// \brief Determine the number of expansions that will be produced when
3418 /// this pack expansion is instantiated, if already known.
3419 Optional<unsigned> getNumExpansions() const {
3421 return NumExpansions - 1;
3426 SourceLocation getLocStart() const LLVM_READONLY {
3427 return Pattern->getLocStart();
3429 SourceLocation getLocEnd() const LLVM_READONLY { return EllipsisLoc; }
3431 static bool classof(const Stmt *T) {
3432 return T->getStmtClass() == PackExpansionExprClass;
3436 child_range children() {
3437 return child_range(&Pattern, &Pattern + 1);
3441 inline ASTTemplateKWAndArgsInfo *OverloadExpr::getTemplateKWAndArgsInfo() {
3442 if (!HasTemplateKWAndArgsInfo) return nullptr;
3443 if (isa<UnresolvedLookupExpr>(this))
3444 return reinterpret_cast<ASTTemplateKWAndArgsInfo*>
3445 (cast<UnresolvedLookupExpr>(this) + 1);
3447 return reinterpret_cast<ASTTemplateKWAndArgsInfo*>
3448 (cast<UnresolvedMemberExpr>(this) + 1);
3451 /// \brief Represents an expression that computes the length of a parameter
3455 /// template<typename ...Types>
3457 /// static const unsigned value = sizeof...(Types);
3460 class SizeOfPackExpr : public Expr {
3461 /// \brief The location of the \c sizeof keyword.
3462 SourceLocation OperatorLoc;
3464 /// \brief The location of the name of the parameter pack.
3465 SourceLocation PackLoc;
3467 /// \brief The location of the closing parenthesis.
3468 SourceLocation RParenLoc;
3470 /// \brief The length of the parameter pack, if known.
3472 /// When this expression is value-dependent, the length of the parameter pack
3473 /// is unknown. When this expression is not value-dependent, the length is
3477 /// \brief The parameter pack itself.
3480 friend class ASTStmtReader;
3481 friend class ASTStmtWriter;
3484 /// \brief Create a value-dependent expression that computes the length of
3485 /// the given parameter pack.
3486 SizeOfPackExpr(QualType SizeType, SourceLocation OperatorLoc, NamedDecl *Pack,
3487 SourceLocation PackLoc, SourceLocation RParenLoc)
3488 : Expr(SizeOfPackExprClass, SizeType, VK_RValue, OK_Ordinary,
3489 /*TypeDependent=*/false, /*ValueDependent=*/true,
3490 /*InstantiationDependent=*/true,
3491 /*ContainsUnexpandedParameterPack=*/false),
3492 OperatorLoc(OperatorLoc), PackLoc(PackLoc), RParenLoc(RParenLoc),
3493 Length(0), Pack(Pack) { }
3495 /// \brief Create an expression that computes the length of
3496 /// the given parameter pack, which is already known.
3497 SizeOfPackExpr(QualType SizeType, SourceLocation OperatorLoc, NamedDecl *Pack,
3498 SourceLocation PackLoc, SourceLocation RParenLoc,
3500 : Expr(SizeOfPackExprClass, SizeType, VK_RValue, OK_Ordinary,
3501 /*TypeDependent=*/false, /*ValueDependent=*/false,
3502 /*InstantiationDependent=*/false,
3503 /*ContainsUnexpandedParameterPack=*/false),
3504 OperatorLoc(OperatorLoc), PackLoc(PackLoc), RParenLoc(RParenLoc),
3505 Length(Length), Pack(Pack) { }
3507 /// \brief Create an empty expression.
3508 SizeOfPackExpr(EmptyShell Empty) : Expr(SizeOfPackExprClass, Empty) { }
3510 /// \brief Determine the location of the 'sizeof' keyword.
3511 SourceLocation getOperatorLoc() const { return OperatorLoc; }
3513 /// \brief Determine the location of the parameter pack.
3514 SourceLocation getPackLoc() const { return PackLoc; }
3516 /// \brief Determine the location of the right parenthesis.
3517 SourceLocation getRParenLoc() const { return RParenLoc; }
3519 /// \brief Retrieve the parameter pack.
3520 NamedDecl *getPack() const { return Pack; }
3522 /// \brief Retrieve the length of the parameter pack.
3524 /// This routine may only be invoked when the expression is not
3525 /// value-dependent.
3526 unsigned getPackLength() const {
3527 assert(!isValueDependent() &&
3528 "Cannot get the length of a value-dependent pack size expression");
3532 SourceLocation getLocStart() const LLVM_READONLY { return OperatorLoc; }
3533 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3535 static bool classof(const Stmt *T) {
3536 return T->getStmtClass() == SizeOfPackExprClass;
3540 child_range children() { return child_range(); }
3543 /// \brief Represents a reference to a non-type template parameter
3544 /// that has been substituted with a template argument.
3545 class SubstNonTypeTemplateParmExpr : public Expr {
3546 /// \brief The replaced parameter.
3547 NonTypeTemplateParmDecl *Param;
3549 /// \brief The replacement expression.
3552 /// \brief The location of the non-type template parameter reference.
3553 SourceLocation NameLoc;
3555 friend class ASTReader;
3556 friend class ASTStmtReader;
3557 explicit SubstNonTypeTemplateParmExpr(EmptyShell Empty)
3558 : Expr(SubstNonTypeTemplateParmExprClass, Empty) { }
3561 SubstNonTypeTemplateParmExpr(QualType type,
3562 ExprValueKind valueKind,
3564 NonTypeTemplateParmDecl *param,
3566 : Expr(SubstNonTypeTemplateParmExprClass, type, valueKind, OK_Ordinary,
3567 replacement->isTypeDependent(), replacement->isValueDependent(),
3568 replacement->isInstantiationDependent(),
3569 replacement->containsUnexpandedParameterPack()),
3570 Param(param), Replacement(replacement), NameLoc(loc) {}
3572 SourceLocation getNameLoc() const { return NameLoc; }
3573 SourceLocation getLocStart() const LLVM_READONLY { return NameLoc; }
3574 SourceLocation getLocEnd() const LLVM_READONLY { return NameLoc; }
3576 Expr *getReplacement() const { return cast<Expr>(Replacement); }
3578 NonTypeTemplateParmDecl *getParameter() const { return Param; }
3580 static bool classof(const Stmt *s) {
3581 return s->getStmtClass() == SubstNonTypeTemplateParmExprClass;
3585 child_range children() { return child_range(&Replacement, &Replacement+1); }
3588 /// \brief Represents a reference to a non-type template parameter pack that
3589 /// has been substituted with a non-template argument pack.
3591 /// When a pack expansion in the source code contains multiple parameter packs
3592 /// and those parameter packs correspond to different levels of template
3593 /// parameter lists, this node is used to represent a non-type template
3594 /// parameter pack from an outer level, which has already had its argument pack
3595 /// substituted but that still lives within a pack expansion that itself
3596 /// could not be instantiated. When actually performing a substitution into
3597 /// that pack expansion (e.g., when all template parameters have corresponding
3598 /// arguments), this type will be replaced with the appropriate underlying
3599 /// expression at the current pack substitution index.
3600 class SubstNonTypeTemplateParmPackExpr : public Expr {
3601 /// \brief The non-type template parameter pack itself.
3602 NonTypeTemplateParmDecl *Param;
3604 /// \brief A pointer to the set of template arguments that this
3605 /// parameter pack is instantiated with.
3606 const TemplateArgument *Arguments;
3608 /// \brief The number of template arguments in \c Arguments.
3609 unsigned NumArguments;
3611 /// \brief The location of the non-type template parameter pack reference.
3612 SourceLocation NameLoc;
3614 friend class ASTReader;
3615 friend class ASTStmtReader;
3616 explicit SubstNonTypeTemplateParmPackExpr(EmptyShell Empty)
3617 : Expr(SubstNonTypeTemplateParmPackExprClass, Empty) { }
3620 SubstNonTypeTemplateParmPackExpr(QualType T,
3621 NonTypeTemplateParmDecl *Param,
3622 SourceLocation NameLoc,
3623 const TemplateArgument &ArgPack);
3625 /// \brief Retrieve the non-type template parameter pack being substituted.
3626 NonTypeTemplateParmDecl *getParameterPack() const { return Param; }
3628 /// \brief Retrieve the location of the parameter pack name.
3629 SourceLocation getParameterPackLocation() const { return NameLoc; }
3631 /// \brief Retrieve the template argument pack containing the substituted
3632 /// template arguments.
3633 TemplateArgument getArgumentPack() const;
3635 SourceLocation getLocStart() const LLVM_READONLY { return NameLoc; }
3636 SourceLocation getLocEnd() const LLVM_READONLY { return NameLoc; }
3638 static bool classof(const Stmt *T) {
3639 return T->getStmtClass() == SubstNonTypeTemplateParmPackExprClass;
3643 child_range children() { return child_range(); }
3646 /// \brief Represents a reference to a function parameter pack that has been
3647 /// substituted but not yet expanded.
3649 /// When a pack expansion contains multiple parameter packs at different levels,
3650 /// this node is used to represent a function parameter pack at an outer level
3651 /// which we have already substituted to refer to expanded parameters, but where
3652 /// the containing pack expansion cannot yet be expanded.
3655 /// template<typename...Ts> struct S {
3656 /// template<typename...Us> auto f(Ts ...ts) -> decltype(g(Us(ts)...));
3658 /// template struct S<int, int>;
3660 class FunctionParmPackExpr : public Expr {
3661 /// \brief The function parameter pack which was referenced.
3662 ParmVarDecl *ParamPack;
3664 /// \brief The location of the function parameter pack reference.
3665 SourceLocation NameLoc;
3667 /// \brief The number of expansions of this pack.
3668 unsigned NumParameters;
3670 FunctionParmPackExpr(QualType T, ParmVarDecl *ParamPack,
3671 SourceLocation NameLoc, unsigned NumParams,
3672 Decl * const *Params);
3674 friend class ASTReader;
3675 friend class ASTStmtReader;
3678 static FunctionParmPackExpr *Create(const ASTContext &Context, QualType T,
3679 ParmVarDecl *ParamPack,
3680 SourceLocation NameLoc,
3681 ArrayRef<Decl *> Params);
3682 static FunctionParmPackExpr *CreateEmpty(const ASTContext &Context,
3683 unsigned NumParams);
3685 /// \brief Get the parameter pack which this expression refers to.
3686 ParmVarDecl *getParameterPack() const { return ParamPack; }
3688 /// \brief Get the location of the parameter pack.
3689 SourceLocation getParameterPackLocation() const { return NameLoc; }
3691 /// \brief Iterators over the parameters which the parameter pack expanded
3693 typedef ParmVarDecl * const *iterator;
3694 iterator begin() const { return reinterpret_cast<iterator>(this+1); }
3695 iterator end() const { return begin() + NumParameters; }
3697 /// \brief Get the number of parameters in this parameter pack.
3698 unsigned getNumExpansions() const { return NumParameters; }
3700 /// \brief Get an expansion of the parameter pack by index.
3701 ParmVarDecl *getExpansion(unsigned I) const { return begin()[I]; }
3703 SourceLocation getLocStart() const LLVM_READONLY { return NameLoc; }
3704 SourceLocation getLocEnd() const LLVM_READONLY { return NameLoc; }
3706 static bool classof(const Stmt *T) {
3707 return T->getStmtClass() == FunctionParmPackExprClass;
3710 child_range children() { return child_range(); }
3713 /// \brief Represents a prvalue temporary that is written into memory so that
3714 /// a reference can bind to it.
3716 /// Prvalue expressions are materialized when they need to have an address
3717 /// in memory for a reference to bind to. This happens when binding a
3718 /// reference to the result of a conversion, e.g.,
3721 /// const int &r = 1.0;
3724 /// Here, 1.0 is implicitly converted to an \c int. That resulting \c int is
3725 /// then materialized via a \c MaterializeTemporaryExpr, and the reference
3726 /// binds to the temporary. \c MaterializeTemporaryExprs are always glvalues
3727 /// (either an lvalue or an xvalue, depending on the kind of reference binding
3728 /// to it), maintaining the invariant that references always bind to glvalues.
3730 /// Reference binding and copy-elision can both extend the lifetime of a
3731 /// temporary. When either happens, the expression will also track the
3732 /// declaration which is responsible for the lifetime extension.
3733 class MaterializeTemporaryExpr : public Expr {
3736 /// \brief The temporary-generating expression whose value will be
3740 /// \brief The declaration which lifetime-extended this reference, if any.
3741 /// Either a VarDecl, or (for a ctor-initializer) a FieldDecl.
3742 const ValueDecl *ExtendingDecl;
3744 unsigned ManglingNumber;
3746 llvm::PointerUnion<Stmt *, ExtraState *> State;
3748 friend class ASTStmtReader;
3749 friend class ASTStmtWriter;
3751 void initializeExtraState(const ValueDecl *ExtendedBy,
3752 unsigned ManglingNumber);
3755 MaterializeTemporaryExpr(QualType T, Expr *Temporary,
3756 bool BoundToLvalueReference)
3757 : Expr(MaterializeTemporaryExprClass, T,
3758 BoundToLvalueReference? VK_LValue : VK_XValue, OK_Ordinary,
3759 Temporary->isTypeDependent(), Temporary->isValueDependent(),
3760 Temporary->isInstantiationDependent(),
3761 Temporary->containsUnexpandedParameterPack()),
3764 MaterializeTemporaryExpr(EmptyShell Empty)
3765 : Expr(MaterializeTemporaryExprClass, Empty) { }
3767 Stmt *getTemporary() const {
3768 return State.is<Stmt *>() ? State.get<Stmt *>()
3769 : State.get<ExtraState *>()->Temporary;
3772 /// \brief Retrieve the temporary-generating subexpression whose value will
3773 /// be materialized into a glvalue.
3774 Expr *GetTemporaryExpr() const { return static_cast<Expr *>(getTemporary()); }
3776 /// \brief Retrieve the storage duration for the materialized temporary.
3777 StorageDuration getStorageDuration() const {
3778 const ValueDecl *ExtendingDecl = getExtendingDecl();
3780 return SD_FullExpression;
3781 // FIXME: This is not necessarily correct for a temporary materialized
3782 // within a default initializer.
3783 if (isa<FieldDecl>(ExtendingDecl))
3784 return SD_Automatic;
3785 return cast<VarDecl>(ExtendingDecl)->getStorageDuration();
3788 /// \brief Get the declaration which triggered the lifetime-extension of this
3789 /// temporary, if any.
3790 const ValueDecl *getExtendingDecl() const {
3791 return State.is<Stmt *>() ? nullptr
3792 : State.get<ExtraState *>()->ExtendingDecl;
3795 void setExtendingDecl(const ValueDecl *ExtendedBy, unsigned ManglingNumber);
3797 unsigned getManglingNumber() const {
3798 return State.is<Stmt *>() ? 0 : State.get<ExtraState *>()->ManglingNumber;
3801 /// \brief Determine whether this materialized temporary is bound to an
3802 /// lvalue reference; otherwise, it's bound to an rvalue reference.
3803 bool isBoundToLvalueReference() const {
3804 return getValueKind() == VK_LValue;
3807 SourceLocation getLocStart() const LLVM_READONLY {
3808 return getTemporary()->getLocStart();
3810 SourceLocation getLocEnd() const LLVM_READONLY {
3811 return getTemporary()->getLocEnd();
3814 static bool classof(const Stmt *T) {
3815 return T->getStmtClass() == MaterializeTemporaryExprClass;
3819 child_range children() {
3820 if (State.is<Stmt *>())
3821 return child_range(State.getAddrOfPtr1(), State.getAddrOfPtr1() + 1);
3823 auto ES = State.get<ExtraState *>();
3824 return child_range(&ES->Temporary, &ES->Temporary + 1);
3828 /// \brief Represents a folding of a pack over an operator.
3830 /// This expression is always dependent and represents a pack expansion of the
3835 /// ( expr op ... op expr )
3836 class CXXFoldExpr : public Expr {
3837 SourceLocation LParenLoc;
3838 SourceLocation EllipsisLoc;
3839 SourceLocation RParenLoc;
3841 BinaryOperatorKind Opcode;
3843 friend class ASTStmtReader;
3844 friend class ASTStmtWriter;
3846 CXXFoldExpr(QualType T, SourceLocation LParenLoc, Expr *LHS,
3847 BinaryOperatorKind Opcode, SourceLocation EllipsisLoc, Expr *RHS,
3848 SourceLocation RParenLoc)
3849 : Expr(CXXFoldExprClass, T, VK_RValue, OK_Ordinary,
3850 /*Dependent*/ true, true, true,
3851 /*ContainsUnexpandedParameterPack*/ false),
3852 LParenLoc(LParenLoc), EllipsisLoc(EllipsisLoc), RParenLoc(RParenLoc),
3857 CXXFoldExpr(EmptyShell Empty) : Expr(CXXFoldExprClass, Empty) {}
3859 Expr *getLHS() const { return static_cast<Expr*>(SubExprs[0]); }
3860 Expr *getRHS() const { return static_cast<Expr*>(SubExprs[1]); }
3862 /// Does this produce a right-associated sequence of operators?
3863 bool isRightFold() const {
3864 return getLHS() && getLHS()->containsUnexpandedParameterPack();
3866 /// Does this produce a left-associated sequence of operators?
3867 bool isLeftFold() const { return !isRightFold(); }
3868 /// Get the pattern, that is, the operand that contains an unexpanded pack.
3869 Expr *getPattern() const { return isLeftFold() ? getRHS() : getLHS(); }
3870 /// Get the operand that doesn't contain a pack, for a binary fold.
3871 Expr *getInit() const { return isLeftFold() ? getLHS() : getRHS(); }
3873 SourceLocation getEllipsisLoc() const { return EllipsisLoc; }
3874 BinaryOperatorKind getOperator() const { return Opcode; }
3876 SourceLocation getLocStart() const LLVM_READONLY {
3879 SourceLocation getLocEnd() const LLVM_READONLY {
3883 static bool classof(const Stmt *T) {
3884 return T->getStmtClass() == CXXFoldExprClass;
3888 child_range children() { return child_range(SubExprs, SubExprs + 2); }
3891 } // end namespace clang