1 //===--- Expr.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 //===----------------------------------------------------------------------===//
10 // This file defines the Expr interface and subclasses.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_AST_EXPR_H
15 #define LLVM_CLANG_AST_EXPR_H
17 #include "clang/AST/APValue.h"
18 #include "clang/AST/ASTVector.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclAccessPair.h"
21 #include "clang/AST/OperationKinds.h"
22 #include "clang/AST/Stmt.h"
23 #include "clang/AST/TemplateBase.h"
24 #include "clang/AST/Type.h"
25 #include "clang/Basic/CharInfo.h"
26 #include "clang/Basic/LangOptions.h"
27 #include "clang/Basic/TypeTraits.h"
28 #include "llvm/ADT/APFloat.h"
29 #include "llvm/ADT/APSInt.h"
30 #include "llvm/ADT/SmallVector.h"
31 #include "llvm/ADT/StringRef.h"
32 #include "llvm/Support/AtomicOrdering.h"
33 #include "llvm/Support/Compiler.h"
39 class CXXBaseSpecifier;
40 class CXXMemberCallExpr;
41 class CXXOperatorCallExpr;
45 class MaterializeTemporaryExpr;
47 class ObjCPropertyRefExpr;
48 class OpaqueValueExpr;
54 /// \brief A simple array of base specifiers.
55 typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
57 /// \brief An adjustment to be made to the temporary created when emitting a
58 /// reference binding, which accesses a particular subobject of that temporary.
59 struct SubobjectAdjustment {
61 DerivedToBaseAdjustment,
63 MemberPointerAdjustment
67 const CastExpr *BasePath;
68 const CXXRecordDecl *DerivedClass;
72 const MemberPointerType *MPT;
77 struct DTB DerivedToBase;
82 SubobjectAdjustment(const CastExpr *BasePath,
83 const CXXRecordDecl *DerivedClass)
84 : Kind(DerivedToBaseAdjustment) {
85 DerivedToBase.BasePath = BasePath;
86 DerivedToBase.DerivedClass = DerivedClass;
89 SubobjectAdjustment(FieldDecl *Field)
90 : Kind(FieldAdjustment) {
94 SubobjectAdjustment(const MemberPointerType *MPT, Expr *RHS)
95 : Kind(MemberPointerAdjustment) {
101 /// Expr - This represents one expression. Note that Expr's are subclasses of
102 /// Stmt. This allows an expression to be transparently used any place a Stmt
105 class Expr : public Stmt {
109 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK,
110 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack)
113 ExprBits.TypeDependent = TD;
114 ExprBits.ValueDependent = VD;
115 ExprBits.InstantiationDependent = ID;
116 ExprBits.ValueKind = VK;
117 ExprBits.ObjectKind = OK;
118 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack;
122 /// \brief Construct an empty expression.
123 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { }
126 QualType getType() const { return TR; }
127 void setType(QualType t) {
128 // In C++, the type of an expression is always adjusted so that it
129 // will not have reference type (C++ [expr]p6). Use
130 // QualType::getNonReferenceType() to retrieve the non-reference
131 // type. Additionally, inspect Expr::isLvalue to determine whether
132 // an expression that is adjusted in this manner should be
133 // considered an lvalue.
134 assert((t.isNull() || !t->isReferenceType()) &&
135 "Expressions can't have reference type");
140 /// isValueDependent - Determines whether this expression is
141 /// value-dependent (C++ [temp.dep.constexpr]). For example, the
142 /// array bound of "Chars" in the following example is
145 /// template<int Size, char (&Chars)[Size]> struct meta_string;
147 bool isValueDependent() const { return ExprBits.ValueDependent; }
149 /// \brief Set whether this expression is value-dependent or not.
150 void setValueDependent(bool VD) {
151 ExprBits.ValueDependent = VD;
154 /// isTypeDependent - Determines whether this expression is
155 /// type-dependent (C++ [temp.dep.expr]), which means that its type
156 /// could change from one template instantiation to the next. For
157 /// example, the expressions "x" and "x + y" are type-dependent in
158 /// the following code, but "y" is not type-dependent:
160 /// template<typename T>
161 /// void add(T x, int y) {
165 bool isTypeDependent() const { return ExprBits.TypeDependent; }
167 /// \brief Set whether this expression is type-dependent or not.
168 void setTypeDependent(bool TD) {
169 ExprBits.TypeDependent = TD;
172 /// \brief Whether this expression is instantiation-dependent, meaning that
173 /// it depends in some way on a template parameter, even if neither its type
174 /// nor (constant) value can change due to the template instantiation.
176 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is
177 /// instantiation-dependent (since it involves a template parameter \c T), but
178 /// is neither type- nor value-dependent, since the type of the inner
179 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer
180 /// \c sizeof is known.
183 /// template<typename T>
184 /// void f(T x, T y) {
185 /// sizeof(sizeof(T() + T());
189 bool isInstantiationDependent() const {
190 return ExprBits.InstantiationDependent;
193 /// \brief Set whether this expression is instantiation-dependent or not.
194 void setInstantiationDependent(bool ID) {
195 ExprBits.InstantiationDependent = ID;
198 /// \brief Whether this expression contains an unexpanded parameter
199 /// pack (for C++11 variadic templates).
201 /// Given the following function template:
204 /// template<typename F, typename ...Types>
205 /// void forward(const F &f, Types &&...args) {
206 /// f(static_cast<Types&&>(args)...);
210 /// The expressions \c args and \c static_cast<Types&&>(args) both
211 /// contain parameter packs.
212 bool containsUnexpandedParameterPack() const {
213 return ExprBits.ContainsUnexpandedParameterPack;
216 /// \brief Set the bit that describes whether this expression
217 /// contains an unexpanded parameter pack.
218 void setContainsUnexpandedParameterPack(bool PP = true) {
219 ExprBits.ContainsUnexpandedParameterPack = PP;
222 /// getExprLoc - Return the preferred location for the arrow when diagnosing
223 /// a problem with a generic expression.
224 SourceLocation getExprLoc() const LLVM_READONLY;
226 /// isUnusedResultAWarning - Return true if this immediate expression should
227 /// be warned about if the result is unused. If so, fill in expr, location,
228 /// and ranges with expr to warn on and source locations/ranges appropriate
230 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc,
231 SourceRange &R1, SourceRange &R2,
232 ASTContext &Ctx) const;
234 /// isLValue - True if this expression is an "l-value" according to
235 /// the rules of the current language. C and C++ give somewhat
236 /// different rules for this concept, but in general, the result of
237 /// an l-value expression identifies a specific object whereas the
238 /// result of an r-value expression is a value detached from any
239 /// specific storage.
241 /// C++11 divides the concept of "r-value" into pure r-values
242 /// ("pr-values") and so-called expiring values ("x-values"), which
243 /// identify specific objects that can be safely cannibalized for
244 /// their resources. This is an unfortunate abuse of terminology on
245 /// the part of the C++ committee. In Clang, when we say "r-value",
246 /// we generally mean a pr-value.
247 bool isLValue() const { return getValueKind() == VK_LValue; }
248 bool isRValue() const { return getValueKind() == VK_RValue; }
249 bool isXValue() const { return getValueKind() == VK_XValue; }
250 bool isGLValue() const { return getValueKind() != VK_RValue; }
252 enum LValueClassification {
255 LV_IncompleteVoidType,
256 LV_DuplicateVectorComponents,
257 LV_InvalidExpression,
258 LV_InvalidMessageExpression,
260 LV_SubObjCPropertySetting,
264 /// Reasons why an expression might not be an l-value.
265 LValueClassification ClassifyLValue(ASTContext &Ctx) const;
267 enum isModifiableLvalueResult {
270 MLV_IncompleteVoidType,
271 MLV_DuplicateVectorComponents,
272 MLV_InvalidExpression,
273 MLV_LValueCast, // Specialized form of MLV_InvalidExpression.
278 MLV_NoSetterProperty,
280 MLV_SubObjCPropertySetting,
281 MLV_InvalidMessageExpression,
285 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
286 /// does not have an incomplete type, does not have a const-qualified type,
287 /// and if it is a structure or union, does not have any member (including,
288 /// recursively, any member or element of all contained aggregates or unions)
289 /// with a const-qualified type.
291 /// \param Loc [in,out] - A source location which *may* be filled
292 /// in with the location of the expression making this a
293 /// non-modifiable lvalue, if specified.
294 isModifiableLvalueResult
295 isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc = nullptr) const;
297 /// \brief The return type of classify(). Represents the C++11 expression
299 class Classification {
301 /// \brief The various classification results. Most of these mean prvalue.
305 CL_Function, // Functions cannot be lvalues in C.
306 CL_Void, // Void cannot be an lvalue in C.
307 CL_AddressableVoid, // Void expression whose address can be taken in C.
308 CL_DuplicateVectorComponents, // A vector shuffle with dupes.
309 CL_MemberFunction, // An expression referring to a member function
310 CL_SubObjCPropertySetting,
311 CL_ClassTemporary, // A temporary of class type, or subobject thereof.
312 CL_ArrayTemporary, // A temporary of array type.
313 CL_ObjCMessageRValue, // ObjC message is an rvalue
314 CL_PRValue // A prvalue for any other reason, of any other type
316 /// \brief The results of modification testing.
317 enum ModifiableType {
318 CM_Untested, // testModifiable was false.
320 CM_RValue, // Not modifiable because it's an rvalue
321 CM_Function, // Not modifiable because it's a function; C++ only
322 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext
323 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter
334 unsigned short Modifiable;
336 explicit Classification(Kinds k, ModifiableType m)
337 : Kind(k), Modifiable(m)
343 Kinds getKind() const { return static_cast<Kinds>(Kind); }
344 ModifiableType getModifiable() const {
345 assert(Modifiable != CM_Untested && "Did not test for modifiability.");
346 return static_cast<ModifiableType>(Modifiable);
348 bool isLValue() const { return Kind == CL_LValue; }
349 bool isXValue() const { return Kind == CL_XValue; }
350 bool isGLValue() const { return Kind <= CL_XValue; }
351 bool isPRValue() const { return Kind >= CL_Function; }
352 bool isRValue() const { return Kind >= CL_XValue; }
353 bool isModifiable() const { return getModifiable() == CM_Modifiable; }
355 /// \brief Create a simple, modifiably lvalue
356 static Classification makeSimpleLValue() {
357 return Classification(CL_LValue, CM_Modifiable);
361 /// \brief Classify - Classify this expression according to the C++11
362 /// expression taxonomy.
364 /// C++11 defines ([basic.lval]) a new taxonomy of expressions to replace the
365 /// old lvalue vs rvalue. This function determines the type of expression this
366 /// is. There are three expression types:
367 /// - lvalues are classical lvalues as in C++03.
368 /// - prvalues are equivalent to rvalues in C++03.
369 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a
370 /// function returning an rvalue reference.
371 /// lvalues and xvalues are collectively referred to as glvalues, while
372 /// prvalues and xvalues together form rvalues.
373 Classification Classify(ASTContext &Ctx) const {
374 return ClassifyImpl(Ctx, nullptr);
377 /// \brief ClassifyModifiable - Classify this expression according to the
378 /// C++11 expression taxonomy, and see if it is valid on the left side
379 /// of an assignment.
381 /// This function extends classify in that it also tests whether the
382 /// expression is modifiable (C99 6.3.2.1p1).
383 /// \param Loc A source location that might be filled with a relevant location
384 /// if the expression is not modifiable.
385 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{
386 return ClassifyImpl(Ctx, &Loc);
389 /// getValueKindForType - Given a formal return or parameter type,
390 /// give its value kind.
391 static ExprValueKind getValueKindForType(QualType T) {
392 if (const ReferenceType *RT = T->getAs<ReferenceType>())
393 return (isa<LValueReferenceType>(RT)
395 : (RT->getPointeeType()->isFunctionType()
396 ? VK_LValue : VK_XValue));
400 /// getValueKind - The value kind that this expression produces.
401 ExprValueKind getValueKind() const {
402 return static_cast<ExprValueKind>(ExprBits.ValueKind);
405 /// getObjectKind - The object kind that this expression produces.
406 /// Object kinds are meaningful only for expressions that yield an
407 /// l-value or x-value.
408 ExprObjectKind getObjectKind() const {
409 return static_cast<ExprObjectKind>(ExprBits.ObjectKind);
412 bool isOrdinaryOrBitFieldObject() const {
413 ExprObjectKind OK = getObjectKind();
414 return (OK == OK_Ordinary || OK == OK_BitField);
417 /// setValueKind - Set the value kind produced by this expression.
418 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; }
420 /// setObjectKind - Set the object kind produced by this expression.
421 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; }
424 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const;
428 /// \brief Returns true if this expression is a gl-value that
429 /// potentially refers to a bit-field.
431 /// In C++, whether a gl-value refers to a bitfield is essentially
432 /// an aspect of the value-kind type system.
433 bool refersToBitField() const { return getObjectKind() == OK_BitField; }
435 /// \brief If this expression refers to a bit-field, retrieve the
436 /// declaration of that bit-field.
438 /// Note that this returns a non-null pointer in subtly different
439 /// places than refersToBitField returns true. In particular, this can
440 /// return a non-null pointer even for r-values loaded from
441 /// bit-fields, but it will return null for a conditional bit-field.
442 FieldDecl *getSourceBitField();
444 const FieldDecl *getSourceBitField() const {
445 return const_cast<Expr*>(this)->getSourceBitField();
448 Decl *getReferencedDeclOfCallee();
449 const Decl *getReferencedDeclOfCallee() const {
450 return const_cast<Expr*>(this)->getReferencedDeclOfCallee();
453 /// \brief If this expression is an l-value for an Objective C
454 /// property, find the underlying property reference expression.
455 const ObjCPropertyRefExpr *getObjCProperty() const;
457 /// \brief Check if this expression is the ObjC 'self' implicit parameter.
458 bool isObjCSelfExpr() const;
460 /// \brief Returns whether this expression refers to a vector element.
461 bool refersToVectorElement() const;
463 /// \brief Returns whether this expression refers to a global register
465 bool refersToGlobalRegisterVar() const;
467 /// \brief Returns whether this expression has a placeholder type.
468 bool hasPlaceholderType() const {
469 return getType()->isPlaceholderType();
472 /// \brief Returns whether this expression has a specific placeholder type.
473 bool hasPlaceholderType(BuiltinType::Kind K) const {
474 assert(BuiltinType::isPlaceholderTypeKind(K));
475 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType()))
476 return BT->getKind() == K;
480 /// isKnownToHaveBooleanValue - Return true if this is an integer expression
481 /// that is known to return 0 or 1. This happens for _Bool/bool expressions
482 /// but also int expressions which are produced by things like comparisons in
484 bool isKnownToHaveBooleanValue() const;
486 /// isIntegerConstantExpr - Return true if this expression is a valid integer
487 /// constant expression, and, if so, return its value in Result. If not a
488 /// valid i-c-e, return false and fill in Loc (if specified) with the location
489 /// of the invalid expression.
491 /// Note: This does not perform the implicit conversions required by C++11
493 bool isIntegerConstantExpr(llvm::APSInt &Result, const ASTContext &Ctx,
494 SourceLocation *Loc = nullptr,
495 bool isEvaluated = true) const;
496 bool isIntegerConstantExpr(const ASTContext &Ctx,
497 SourceLocation *Loc = nullptr) const;
499 /// isCXX98IntegralConstantExpr - Return true if this expression is an
500 /// integral constant expression in C++98. Can only be used in C++.
501 bool isCXX98IntegralConstantExpr(const ASTContext &Ctx) const;
503 /// isCXX11ConstantExpr - Return true if this expression is a constant
504 /// expression in C++11. Can only be used in C++.
506 /// Note: This does not perform the implicit conversions required by C++11
508 bool isCXX11ConstantExpr(const ASTContext &Ctx, APValue *Result = nullptr,
509 SourceLocation *Loc = nullptr) const;
511 /// isPotentialConstantExpr - Return true if this function's definition
512 /// might be usable in a constant expression in C++11, if it were marked
513 /// constexpr. Return false if the function can never produce a constant
514 /// expression, along with diagnostics describing why not.
515 static bool isPotentialConstantExpr(const FunctionDecl *FD,
517 PartialDiagnosticAt> &Diags);
519 /// isPotentialConstantExprUnevaluted - Return true if this expression might
520 /// be usable in a constant expression in C++11 in an unevaluated context, if
521 /// it were in function FD marked constexpr. Return false if the function can
522 /// never produce a constant expression, along with diagnostics describing
524 static bool isPotentialConstantExprUnevaluated(Expr *E,
525 const FunctionDecl *FD,
527 PartialDiagnosticAt> &Diags);
529 /// isConstantInitializer - Returns true if this expression can be emitted to
530 /// IR as a constant, and thus can be used as a constant initializer in C.
531 /// If this expression is not constant and Culprit is non-null,
532 /// it is used to store the address of first non constant expr.
533 bool isConstantInitializer(ASTContext &Ctx, bool ForRef,
534 const Expr **Culprit = nullptr) const;
536 /// EvalStatus is a struct with detailed info about an evaluation in progress.
538 /// \brief Whether the evaluated expression has side effects.
539 /// For example, (f() && 0) can be folded, but it still has side effects.
542 /// \brief Whether the evaluation hit undefined behavior.
543 /// For example, 1.0 / 0.0 can be folded to Inf, but has undefined behavior.
544 /// Likewise, INT_MAX + 1 can be folded to INT_MIN, but has UB.
545 bool HasUndefinedBehavior;
547 /// Diag - If this is non-null, it will be filled in with a stack of notes
548 /// indicating why evaluation failed (or why it failed to produce a constant
550 /// If the expression is unfoldable, the notes will indicate why it's not
551 /// foldable. If the expression is foldable, but not a constant expression,
552 /// the notes will describes why it isn't a constant expression. If the
553 /// expression *is* a constant expression, no notes will be produced.
554 SmallVectorImpl<PartialDiagnosticAt> *Diag;
557 : HasSideEffects(false), HasUndefinedBehavior(false), Diag(nullptr) {}
559 // hasSideEffects - Return true if the evaluated expression has
561 bool hasSideEffects() const {
562 return HasSideEffects;
566 /// EvalResult is a struct with detailed info about an evaluated expression.
567 struct EvalResult : EvalStatus {
568 /// Val - This is the value the expression can be folded to.
571 // isGlobalLValue - Return true if the evaluated lvalue expression
573 bool isGlobalLValue() const;
576 /// EvaluateAsRValue - Return true if this is a constant which we can fold to
577 /// an rvalue using any crazy technique (that has nothing to do with language
578 /// standards) that we want to, even if the expression has side-effects. If
579 /// this function returns true, it returns the folded constant in Result. If
580 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be
582 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const;
584 /// EvaluateAsBooleanCondition - Return true if this is a constant
585 /// which we we can fold and convert to a boolean condition using
586 /// any crazy technique that we want to, even if the expression has
588 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const;
590 enum SideEffectsKind {
591 SE_NoSideEffects, ///< Strictly evaluate the expression.
592 SE_AllowUndefinedBehavior, ///< Allow UB that we can give a value, but not
593 ///< arbitrary unmodeled side effects.
594 SE_AllowSideEffects ///< Allow any unmodeled side effect.
597 /// EvaluateAsInt - Return true if this is a constant which we can fold and
598 /// convert to an integer, using any crazy technique that we want to.
599 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx,
600 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const;
602 /// EvaluateAsFloat - Return true if this is a constant which we can fold and
603 /// convert to a floating point value, using any crazy technique that we
606 EvaluateAsFloat(llvm::APFloat &Result, const ASTContext &Ctx,
607 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const;
609 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be
610 /// constant folded without side-effects, but discard the result.
611 bool isEvaluatable(const ASTContext &Ctx,
612 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const;
614 /// HasSideEffects - This routine returns true for all those expressions
615 /// which have any effect other than producing a value. Example is a function
616 /// call, volatile variable read, or throwing an exception. If
617 /// IncludePossibleEffects is false, this call treats certain expressions with
618 /// potential side effects (such as function call-like expressions,
619 /// instantiation-dependent expressions, or invocations from a macro) as not
620 /// having side effects.
621 bool HasSideEffects(const ASTContext &Ctx,
622 bool IncludePossibleEffects = true) const;
624 /// \brief Determine whether this expression involves a call to any function
625 /// that is not trivial.
626 bool hasNonTrivialCall(const ASTContext &Ctx) const;
628 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded
629 /// integer. This must be called on an expression that constant folds to an
631 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx,
632 SmallVectorImpl<PartialDiagnosticAt> *Diag = nullptr) const;
634 void EvaluateForOverflow(const ASTContext &Ctx) const;
636 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an
637 /// lvalue with link time known address, with no side-effects.
638 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const;
640 /// EvaluateAsInitializer - Evaluate an expression as if it were the
641 /// initializer of the given declaration. Returns true if the initializer
642 /// can be folded to a constant, and produces any relevant notes. In C++11,
643 /// notes will be produced if the expression is not a constant expression.
644 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx,
646 SmallVectorImpl<PartialDiagnosticAt> &Notes) const;
648 /// EvaluateWithSubstitution - Evaluate an expression as if from the context
649 /// of a call to the given function with the given arguments, inside an
650 /// unevaluated context. Returns true if the expression could be folded to a
652 bool EvaluateWithSubstitution(APValue &Value, ASTContext &Ctx,
653 const FunctionDecl *Callee,
654 ArrayRef<const Expr*> Args) const;
656 /// \brief If the current Expr is a pointer, this will try to statically
657 /// determine the number of bytes available where the pointer is pointing.
658 /// Returns true if all of the above holds and we were able to figure out the
659 /// size, false otherwise.
661 /// \param Type - How to evaluate the size of the Expr, as defined by the
662 /// "type" parameter of __builtin_object_size
663 bool tryEvaluateObjectSize(uint64_t &Result, ASTContext &Ctx,
664 unsigned Type) const;
666 /// \brief Enumeration used to describe the kind of Null pointer constant
667 /// returned from \c isNullPointerConstant().
668 enum NullPointerConstantKind {
669 /// \brief Expression is not a Null pointer constant.
672 /// \brief Expression is a Null pointer constant built from a zero integer
673 /// expression that is not a simple, possibly parenthesized, zero literal.
674 /// C++ Core Issue 903 will classify these expressions as "not pointers"
675 /// once it is adopted.
676 /// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903
679 /// \brief Expression is a Null pointer constant built from a literal zero.
682 /// \brief Expression is a C++11 nullptr.
685 /// \brief Expression is a GNU-style __null constant.
689 /// \brief Enumeration used to describe how \c isNullPointerConstant()
690 /// should cope with value-dependent expressions.
691 enum NullPointerConstantValueDependence {
692 /// \brief Specifies that the expression should never be value-dependent.
693 NPC_NeverValueDependent = 0,
695 /// \brief Specifies that a value-dependent expression of integral or
696 /// dependent type should be considered a null pointer constant.
697 NPC_ValueDependentIsNull,
699 /// \brief Specifies that a value-dependent expression should be considered
700 /// to never be a null pointer constant.
701 NPC_ValueDependentIsNotNull
704 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to
705 /// a Null pointer constant. The return value can further distinguish the
706 /// kind of NULL pointer constant that was detected.
707 NullPointerConstantKind isNullPointerConstant(
709 NullPointerConstantValueDependence NPC) const;
711 /// isOBJCGCCandidate - Return true if this expression may be used in a read/
713 bool isOBJCGCCandidate(ASTContext &Ctx) const;
715 /// \brief Returns true if this expression is a bound member function.
716 bool isBoundMemberFunction(ASTContext &Ctx) const;
718 /// \brief Given an expression of bound-member type, find the type
719 /// of the member. Returns null if this is an *overloaded* bound
720 /// member expression.
721 static QualType findBoundMemberType(const Expr *expr);
723 /// IgnoreImpCasts - Skip past any implicit casts which might
724 /// surround this expression. Only skips ImplicitCastExprs.
725 Expr *IgnoreImpCasts() LLVM_READONLY;
727 /// IgnoreImplicit - Skip past any implicit AST nodes which might
728 /// surround this expression.
729 Expr *IgnoreImplicit() LLVM_READONLY {
730 return cast<Expr>(Stmt::IgnoreImplicit());
733 const Expr *IgnoreImplicit() const LLVM_READONLY {
734 return const_cast<Expr*>(this)->IgnoreImplicit();
737 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return
738 /// its subexpression. If that subexpression is also a ParenExpr,
739 /// then this method recursively returns its subexpression, and so forth.
740 /// Otherwise, the method returns the current Expr.
741 Expr *IgnoreParens() LLVM_READONLY;
743 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr
744 /// or CastExprs, returning their operand.
745 Expr *IgnoreParenCasts() LLVM_READONLY;
747 /// Ignore casts. Strip off any CastExprs, returning their operand.
748 Expr *IgnoreCasts() LLVM_READONLY;
750 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off
751 /// any ParenExpr or ImplicitCastExprs, returning their operand.
752 Expr *IgnoreParenImpCasts() LLVM_READONLY;
754 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a
755 /// call to a conversion operator, return the argument.
756 Expr *IgnoreConversionOperator() LLVM_READONLY;
758 const Expr *IgnoreConversionOperator() const LLVM_READONLY {
759 return const_cast<Expr*>(this)->IgnoreConversionOperator();
762 const Expr *IgnoreParenImpCasts() const LLVM_READONLY {
763 return const_cast<Expr*>(this)->IgnoreParenImpCasts();
766 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and
767 /// CastExprs that represent lvalue casts, returning their operand.
768 Expr *IgnoreParenLValueCasts() LLVM_READONLY;
770 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY {
771 return const_cast<Expr*>(this)->IgnoreParenLValueCasts();
774 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the
775 /// value (including ptr->int casts of the same size). Strip off any
776 /// ParenExpr or CastExprs, returning their operand.
777 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY;
779 /// Ignore parentheses and derived-to-base casts.
780 Expr *ignoreParenBaseCasts() LLVM_READONLY;
782 const Expr *ignoreParenBaseCasts() const LLVM_READONLY {
783 return const_cast<Expr*>(this)->ignoreParenBaseCasts();
786 /// \brief Determine whether this expression is a default function argument.
788 /// Default arguments are implicitly generated in the abstract syntax tree
789 /// by semantic analysis for function calls, object constructions, etc. in
790 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes;
791 /// this routine also looks through any implicit casts to determine whether
792 /// the expression is a default argument.
793 bool isDefaultArgument() const;
795 /// \brief Determine whether the result of this expression is a
796 /// temporary object of the given class type.
797 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const;
799 /// \brief Whether this expression is an implicit reference to 'this' in C++.
800 bool isImplicitCXXThis() const;
802 const Expr *IgnoreImpCasts() const LLVM_READONLY {
803 return const_cast<Expr*>(this)->IgnoreImpCasts();
805 const Expr *IgnoreParens() const LLVM_READONLY {
806 return const_cast<Expr*>(this)->IgnoreParens();
808 const Expr *IgnoreParenCasts() const LLVM_READONLY {
809 return const_cast<Expr*>(this)->IgnoreParenCasts();
811 /// Strip off casts, but keep parentheses.
812 const Expr *IgnoreCasts() const LLVM_READONLY {
813 return const_cast<Expr*>(this)->IgnoreCasts();
816 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY {
817 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx);
820 static bool hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs);
822 /// \brief For an expression of class type or pointer to class type,
823 /// return the most derived class decl the expression is known to refer to.
825 /// If this expression is a cast, this method looks through it to find the
826 /// most derived decl that can be inferred from the expression.
827 /// This is valid because derived-to-base conversions have undefined
828 /// behavior if the object isn't dynamically of the derived type.
829 const CXXRecordDecl *getBestDynamicClassType() const;
831 /// \brief Get the inner expression that determines the best dynamic class.
832 /// If this is a prvalue, we guarantee that it is of the most-derived type
833 /// for the object itself.
834 const Expr *getBestDynamicClassTypeExpr() const;
836 /// Walk outwards from an expression we want to bind a reference to and
837 /// find the expression whose lifetime needs to be extended. Record
838 /// the LHSs of comma expressions and adjustments needed along the path.
839 const Expr *skipRValueSubobjectAdjustments(
840 SmallVectorImpl<const Expr *> &CommaLHS,
841 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const;
842 const Expr *skipRValueSubobjectAdjustments() const {
843 SmallVector<const Expr *, 8> CommaLHSs;
844 SmallVector<SubobjectAdjustment, 8> Adjustments;
845 return skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
848 static bool classof(const Stmt *T) {
849 return T->getStmtClass() >= firstExprConstant &&
850 T->getStmtClass() <= lastExprConstant;
854 //===----------------------------------------------------------------------===//
855 // Primary Expressions.
856 //===----------------------------------------------------------------------===//
858 /// OpaqueValueExpr - An expression referring to an opaque object of a
859 /// fixed type and value class. These don't correspond to concrete
860 /// syntax; instead they're used to express operations (usually copy
861 /// operations) on values whose source is generally obvious from
863 class OpaqueValueExpr : public Expr {
864 friend class ASTStmtReader;
869 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK,
870 ExprObjectKind OK = OK_Ordinary,
871 Expr *SourceExpr = nullptr)
872 : Expr(OpaqueValueExprClass, T, VK, OK,
873 T->isDependentType() ||
874 (SourceExpr && SourceExpr->isTypeDependent()),
875 T->isDependentType() ||
876 (SourceExpr && SourceExpr->isValueDependent()),
877 T->isInstantiationDependentType() ||
878 (SourceExpr && SourceExpr->isInstantiationDependent()),
880 SourceExpr(SourceExpr), Loc(Loc) {
883 /// Given an expression which invokes a copy constructor --- i.e. a
884 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups ---
885 /// find the OpaqueValueExpr that's the source of the construction.
886 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr);
888 explicit OpaqueValueExpr(EmptyShell Empty)
889 : Expr(OpaqueValueExprClass, Empty) { }
891 /// \brief Retrieve the location of this expression.
892 SourceLocation getLocation() const { return Loc; }
894 SourceLocation getLocStart() const LLVM_READONLY {
895 return SourceExpr ? SourceExpr->getLocStart() : Loc;
897 SourceLocation getLocEnd() const LLVM_READONLY {
898 return SourceExpr ? SourceExpr->getLocEnd() : Loc;
900 SourceLocation getExprLoc() const LLVM_READONLY {
901 if (SourceExpr) return SourceExpr->getExprLoc();
905 child_range children() {
906 return child_range(child_iterator(), child_iterator());
909 /// The source expression of an opaque value expression is the
910 /// expression which originally generated the value. This is
911 /// provided as a convenience for analyses that don't wish to
912 /// precisely model the execution behavior of the program.
914 /// The source expression is typically set when building the
915 /// expression which binds the opaque value expression in the first
917 Expr *getSourceExpr() const { return SourceExpr; }
919 static bool classof(const Stmt *T) {
920 return T->getStmtClass() == OpaqueValueExprClass;
924 /// \brief A reference to a declared variable, function, enum, etc.
927 /// This encodes all the information about how a declaration is referenced
928 /// within an expression.
930 /// There are several optional constructs attached to DeclRefExprs only when
931 /// they apply in order to conserve memory. These are laid out past the end of
932 /// the object, and flags in the DeclRefExprBitfield track whether they exist:
934 /// DeclRefExprBits.HasQualifier:
935 /// Specifies when this declaration reference expression has a C++
936 /// nested-name-specifier.
937 /// DeclRefExprBits.HasFoundDecl:
938 /// Specifies when this declaration reference expression has a record of
939 /// a NamedDecl (different from the referenced ValueDecl) which was found
940 /// during name lookup and/or overload resolution.
941 /// DeclRefExprBits.HasTemplateKWAndArgsInfo:
942 /// Specifies when this declaration reference expression has an explicit
943 /// C++ template keyword and/or template argument list.
944 /// DeclRefExprBits.RefersToEnclosingVariableOrCapture
945 /// Specifies when this declaration reference expression (validly)
946 /// refers to an enclosed local or a captured variable.
947 class DeclRefExpr final
949 private llvm::TrailingObjects<DeclRefExpr, NestedNameSpecifierLoc,
950 NamedDecl *, ASTTemplateKWAndArgsInfo,
951 TemplateArgumentLoc> {
952 /// \brief The declaration that we are referencing.
955 /// \brief The location of the declaration name itself.
958 /// \brief Provides source/type location info for the declaration name
960 DeclarationNameLoc DNLoc;
962 size_t numTrailingObjects(OverloadToken<NestedNameSpecifierLoc>) const {
963 return hasQualifier() ? 1 : 0;
966 size_t numTrailingObjects(OverloadToken<NamedDecl *>) const {
967 return hasFoundDecl() ? 1 : 0;
970 size_t numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>) const {
971 return hasTemplateKWAndArgsInfo() ? 1 : 0;
974 /// \brief Test whether there is a distinct FoundDecl attached to the end of
976 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; }
978 DeclRefExpr(const ASTContext &Ctx,
979 NestedNameSpecifierLoc QualifierLoc,
980 SourceLocation TemplateKWLoc,
981 ValueDecl *D, bool RefersToEnlosingVariableOrCapture,
982 const DeclarationNameInfo &NameInfo,
984 const TemplateArgumentListInfo *TemplateArgs,
985 QualType T, ExprValueKind VK);
987 /// \brief Construct an empty declaration reference expression.
988 explicit DeclRefExpr(EmptyShell Empty)
989 : Expr(DeclRefExprClass, Empty) { }
991 /// \brief Computes the type- and value-dependence flags for this
992 /// declaration reference expression.
993 void computeDependence(const ASTContext &C);
996 DeclRefExpr(ValueDecl *D, bool RefersToEnclosingVariableOrCapture, QualType T,
997 ExprValueKind VK, SourceLocation L,
998 const DeclarationNameLoc &LocInfo = DeclarationNameLoc())
999 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false),
1000 D(D), Loc(L), DNLoc(LocInfo) {
1001 DeclRefExprBits.HasQualifier = 0;
1002 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0;
1003 DeclRefExprBits.HasFoundDecl = 0;
1004 DeclRefExprBits.HadMultipleCandidates = 0;
1005 DeclRefExprBits.RefersToEnclosingVariableOrCapture =
1006 RefersToEnclosingVariableOrCapture;
1007 computeDependence(D->getASTContext());
1010 static DeclRefExpr *
1011 Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc,
1012 SourceLocation TemplateKWLoc, ValueDecl *D,
1013 bool RefersToEnclosingVariableOrCapture, SourceLocation NameLoc,
1014 QualType T, ExprValueKind VK, NamedDecl *FoundD = nullptr,
1015 const TemplateArgumentListInfo *TemplateArgs = nullptr);
1017 static DeclRefExpr *
1018 Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc,
1019 SourceLocation TemplateKWLoc, ValueDecl *D,
1020 bool RefersToEnclosingVariableOrCapture,
1021 const DeclarationNameInfo &NameInfo, QualType T, ExprValueKind VK,
1022 NamedDecl *FoundD = nullptr,
1023 const TemplateArgumentListInfo *TemplateArgs = nullptr);
1025 /// \brief Construct an empty declaration reference expression.
1026 static DeclRefExpr *CreateEmpty(const ASTContext &Context,
1029 bool HasTemplateKWAndArgsInfo,
1030 unsigned NumTemplateArgs);
1032 ValueDecl *getDecl() { return D; }
1033 const ValueDecl *getDecl() const { return D; }
1034 void setDecl(ValueDecl *NewD) { D = NewD; }
1036 DeclarationNameInfo getNameInfo() const {
1037 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc);
1040 SourceLocation getLocation() const { return Loc; }
1041 void setLocation(SourceLocation L) { Loc = L; }
1042 SourceLocation getLocStart() const LLVM_READONLY;
1043 SourceLocation getLocEnd() const LLVM_READONLY;
1045 /// \brief Determine whether this declaration reference was preceded by a
1046 /// C++ nested-name-specifier, e.g., \c N::foo.
1047 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; }
1049 /// \brief If the name was qualified, retrieves the nested-name-specifier
1050 /// that precedes the name, with source-location information.
1051 NestedNameSpecifierLoc getQualifierLoc() const {
1052 if (!hasQualifier())
1053 return NestedNameSpecifierLoc();
1054 return *getTrailingObjects<NestedNameSpecifierLoc>();
1057 /// \brief If the name was qualified, retrieves the nested-name-specifier
1058 /// that precedes the name. Otherwise, returns NULL.
1059 NestedNameSpecifier *getQualifier() const {
1060 return getQualifierLoc().getNestedNameSpecifier();
1063 /// \brief Get the NamedDecl through which this reference occurred.
1065 /// This Decl may be different from the ValueDecl actually referred to in the
1066 /// presence of using declarations, etc. It always returns non-NULL, and may
1067 /// simple return the ValueDecl when appropriate.
1069 NamedDecl *getFoundDecl() {
1070 return hasFoundDecl() ? *getTrailingObjects<NamedDecl *>() : D;
1073 /// \brief Get the NamedDecl through which this reference occurred.
1074 /// See non-const variant.
1075 const NamedDecl *getFoundDecl() const {
1076 return hasFoundDecl() ? *getTrailingObjects<NamedDecl *>() : D;
1079 bool hasTemplateKWAndArgsInfo() const {
1080 return DeclRefExprBits.HasTemplateKWAndArgsInfo;
1083 /// \brief Retrieve the location of the template keyword preceding
1084 /// this name, if any.
1085 SourceLocation getTemplateKeywordLoc() const {
1086 if (!hasTemplateKWAndArgsInfo()) return SourceLocation();
1087 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->TemplateKWLoc;
1090 /// \brief Retrieve the location of the left angle bracket starting the
1091 /// explicit template argument list following the name, if any.
1092 SourceLocation getLAngleLoc() const {
1093 if (!hasTemplateKWAndArgsInfo()) return SourceLocation();
1094 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->LAngleLoc;
1097 /// \brief Retrieve the location of the right angle bracket ending the
1098 /// explicit template argument list following the name, if any.
1099 SourceLocation getRAngleLoc() const {
1100 if (!hasTemplateKWAndArgsInfo()) return SourceLocation();
1101 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->RAngleLoc;
1104 /// \brief Determines whether the name in this declaration reference
1105 /// was preceded by the template keyword.
1106 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }
1108 /// \brief Determines whether this declaration reference was followed by an
1109 /// explicit template argument list.
1110 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }
1112 /// \brief Copies the template arguments (if present) into the given
1114 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
1115 if (hasExplicitTemplateArgs())
1116 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->copyInto(
1117 getTrailingObjects<TemplateArgumentLoc>(), List);
1120 /// \brief Retrieve the template arguments provided as part of this
1122 const TemplateArgumentLoc *getTemplateArgs() const {
1123 if (!hasExplicitTemplateArgs())
1126 return getTrailingObjects<TemplateArgumentLoc>();
1129 /// \brief Retrieve the number of template arguments provided as part of this
1131 unsigned getNumTemplateArgs() const {
1132 if (!hasExplicitTemplateArgs())
1135 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->NumTemplateArgs;
1138 ArrayRef<TemplateArgumentLoc> template_arguments() const {
1139 return {getTemplateArgs(), getNumTemplateArgs()};
1142 /// \brief Returns true if this expression refers to a function that
1143 /// was resolved from an overloaded set having size greater than 1.
1144 bool hadMultipleCandidates() const {
1145 return DeclRefExprBits.HadMultipleCandidates;
1147 /// \brief Sets the flag telling whether this expression refers to
1148 /// a function that was resolved from an overloaded set having size
1150 void setHadMultipleCandidates(bool V = true) {
1151 DeclRefExprBits.HadMultipleCandidates = V;
1154 /// \brief Does this DeclRefExpr refer to an enclosing local or a captured
1156 bool refersToEnclosingVariableOrCapture() const {
1157 return DeclRefExprBits.RefersToEnclosingVariableOrCapture;
1160 static bool classof(const Stmt *T) {
1161 return T->getStmtClass() == DeclRefExprClass;
1165 child_range children() {
1166 return child_range(child_iterator(), child_iterator());
1169 friend TrailingObjects;
1170 friend class ASTStmtReader;
1171 friend class ASTStmtWriter;
1174 /// \brief [C99 6.4.2.2] - A predefined identifier such as __func__.
1175 class PredefinedExpr : public Expr {
1180 LFunction, // Same as Function, but as wide string.
1184 /// \brief The same as PrettyFunction, except that the
1185 /// 'virtual' keyword is omitted for virtual member functions.
1186 PrettyFunctionNoVirtual
1195 PredefinedExpr(SourceLocation L, QualType FNTy, IdentType IT,
1198 /// \brief Construct an empty predefined expression.
1199 explicit PredefinedExpr(EmptyShell Empty)
1200 : Expr(PredefinedExprClass, Empty), Loc(), Type(Func), FnName(nullptr) {}
1202 IdentType getIdentType() const { return Type; }
1204 SourceLocation getLocation() const { return Loc; }
1205 void setLocation(SourceLocation L) { Loc = L; }
1207 StringLiteral *getFunctionName();
1208 const StringLiteral *getFunctionName() const {
1209 return const_cast<PredefinedExpr *>(this)->getFunctionName();
1212 static StringRef getIdentTypeName(IdentType IT);
1213 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl);
1215 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
1216 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
1218 static bool classof(const Stmt *T) {
1219 return T->getStmtClass() == PredefinedExprClass;
1223 child_range children() { return child_range(&FnName, &FnName + 1); }
1225 friend class ASTStmtReader;
1228 /// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without
1231 /// For large floats/integers, APFloat/APInt will allocate memory from the heap
1232 /// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator
1233 /// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with
1234 /// the APFloat/APInt values will never get freed. APNumericStorage uses
1235 /// ASTContext's allocator for memory allocation.
1236 class APNumericStorage {
1238 uint64_t VAL; ///< Used to store the <= 64 bits integer value.
1239 uint64_t *pVal; ///< Used to store the >64 bits integer value.
1243 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; }
1245 APNumericStorage(const APNumericStorage &) = delete;
1246 void operator=(const APNumericStorage &) = delete;
1249 APNumericStorage() : VAL(0), BitWidth(0) { }
1251 llvm::APInt getIntValue() const {
1252 unsigned NumWords = llvm::APInt::getNumWords(BitWidth);
1254 return llvm::APInt(BitWidth, NumWords, pVal);
1256 return llvm::APInt(BitWidth, VAL);
1258 void setIntValue(const ASTContext &C, const llvm::APInt &Val);
1261 class APIntStorage : private APNumericStorage {
1263 llvm::APInt getValue() const { return getIntValue(); }
1264 void setValue(const ASTContext &C, const llvm::APInt &Val) {
1265 setIntValue(C, Val);
1269 class APFloatStorage : private APNumericStorage {
1271 llvm::APFloat getValue(const llvm::fltSemantics &Semantics) const {
1272 return llvm::APFloat(Semantics, getIntValue());
1274 void setValue(const ASTContext &C, const llvm::APFloat &Val) {
1275 setIntValue(C, Val.bitcastToAPInt());
1279 class IntegerLiteral : public Expr, public APIntStorage {
1282 /// \brief Construct an empty integer literal.
1283 explicit IntegerLiteral(EmptyShell Empty)
1284 : Expr(IntegerLiteralClass, Empty) { }
1287 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy,
1288 // or UnsignedLongLongTy
1289 IntegerLiteral(const ASTContext &C, const llvm::APInt &V, QualType type,
1292 /// \brief Returns a new integer literal with value 'V' and type 'type'.
1293 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy,
1294 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V
1295 /// \param V - the value that the returned integer literal contains.
1296 static IntegerLiteral *Create(const ASTContext &C, const llvm::APInt &V,
1297 QualType type, SourceLocation l);
1298 /// \brief Returns a new empty integer literal.
1299 static IntegerLiteral *Create(const ASTContext &C, EmptyShell Empty);
1301 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
1302 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
1304 /// \brief Retrieve the location of the literal.
1305 SourceLocation getLocation() const { return Loc; }
1307 void setLocation(SourceLocation Location) { Loc = Location; }
1309 static bool classof(const Stmt *T) {
1310 return T->getStmtClass() == IntegerLiteralClass;
1314 child_range children() {
1315 return child_range(child_iterator(), child_iterator());
1319 class CharacterLiteral : public Expr {
1321 enum CharacterKind {
1333 // type should be IntTy
1334 CharacterLiteral(unsigned value, CharacterKind kind, QualType type,
1336 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false,
1338 Value(value), Loc(l) {
1339 CharacterLiteralBits.Kind = kind;
1342 /// \brief Construct an empty character literal.
1343 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { }
1345 SourceLocation getLocation() const { return Loc; }
1346 CharacterKind getKind() const {
1347 return static_cast<CharacterKind>(CharacterLiteralBits.Kind);
1350 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
1351 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
1353 unsigned getValue() const { return Value; }
1355 void setLocation(SourceLocation Location) { Loc = Location; }
1356 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; }
1357 void setValue(unsigned Val) { Value = Val; }
1359 static bool classof(const Stmt *T) {
1360 return T->getStmtClass() == CharacterLiteralClass;
1364 child_range children() {
1365 return child_range(child_iterator(), child_iterator());
1369 class FloatingLiteral : public Expr, private APFloatStorage {
1372 FloatingLiteral(const ASTContext &C, const llvm::APFloat &V, bool isexact,
1373 QualType Type, SourceLocation L);
1375 /// \brief Construct an empty floating-point literal.
1376 explicit FloatingLiteral(const ASTContext &C, EmptyShell Empty);
1379 static FloatingLiteral *Create(const ASTContext &C, const llvm::APFloat &V,
1380 bool isexact, QualType Type, SourceLocation L);
1381 static FloatingLiteral *Create(const ASTContext &C, EmptyShell Empty);
1383 llvm::APFloat getValue() const {
1384 return APFloatStorage::getValue(getSemantics());
1386 void setValue(const ASTContext &C, const llvm::APFloat &Val) {
1387 assert(&getSemantics() == &Val.getSemantics() && "Inconsistent semantics");
1388 APFloatStorage::setValue(C, Val);
1391 /// Get a raw enumeration value representing the floating-point semantics of
1392 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation.
1393 APFloatSemantics getRawSemantics() const {
1394 return static_cast<APFloatSemantics>(FloatingLiteralBits.Semantics);
1397 /// Set the raw enumeration value representing the floating-point semantics of
1398 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation.
1399 void setRawSemantics(APFloatSemantics Sem) {
1400 FloatingLiteralBits.Semantics = Sem;
1403 /// Return the APFloat semantics this literal uses.
1404 const llvm::fltSemantics &getSemantics() const;
1406 /// Set the APFloat semantics this literal uses.
1407 void setSemantics(const llvm::fltSemantics &Sem);
1409 bool isExact() const { return FloatingLiteralBits.IsExact; }
1410 void setExact(bool E) { FloatingLiteralBits.IsExact = E; }
1412 /// getValueAsApproximateDouble - This returns the value as an inaccurate
1413 /// double. Note that this may cause loss of precision, but is useful for
1414 /// debugging dumps, etc.
1415 double getValueAsApproximateDouble() const;
1417 SourceLocation getLocation() const { return Loc; }
1418 void setLocation(SourceLocation L) { Loc = L; }
1420 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
1421 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
1423 static bool classof(const Stmt *T) {
1424 return T->getStmtClass() == FloatingLiteralClass;
1428 child_range children() {
1429 return child_range(child_iterator(), child_iterator());
1433 /// ImaginaryLiteral - We support imaginary integer and floating point literals,
1434 /// like "1.0i". We represent these as a wrapper around FloatingLiteral and
1435 /// IntegerLiteral classes. Instances of this class always have a Complex type
1436 /// whose element type matches the subexpression.
1438 class ImaginaryLiteral : public Expr {
1441 ImaginaryLiteral(Expr *val, QualType Ty)
1442 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false,
1446 /// \brief Build an empty imaginary literal.
1447 explicit ImaginaryLiteral(EmptyShell Empty)
1448 : Expr(ImaginaryLiteralClass, Empty) { }
1450 const Expr *getSubExpr() const { return cast<Expr>(Val); }
1451 Expr *getSubExpr() { return cast<Expr>(Val); }
1452 void setSubExpr(Expr *E) { Val = E; }
1454 SourceLocation getLocStart() const LLVM_READONLY { return Val->getLocStart(); }
1455 SourceLocation getLocEnd() const LLVM_READONLY { return Val->getLocEnd(); }
1457 static bool classof(const Stmt *T) {
1458 return T->getStmtClass() == ImaginaryLiteralClass;
1462 child_range children() { return child_range(&Val, &Val+1); }
1465 /// StringLiteral - This represents a string literal expression, e.g. "foo"
1466 /// or L"bar" (wide strings). The actual string is returned by getBytes()
1467 /// is NOT null-terminated, and the length of the string is determined by
1468 /// calling getByteLength(). The C type for a string is always a
1469 /// ConstantArrayType. In C++, the char type is const qualified, in C it is
1472 /// Note that strings in C can be formed by concatenation of multiple string
1473 /// literal pptokens in translation phase #6. This keeps track of the locations
1474 /// of each of these pieces.
1476 /// Strings in C can also be truncated and extended by assigning into arrays,
1477 /// e.g. with constructs like:
1478 /// char X[2] = "foobar";
1479 /// In this case, getByteLength() will return 6, but the string literal will
1480 /// have type "char[2]".
1481 class StringLiteral : public Expr {
1492 friend class ASTStmtReader;
1496 const uint16_t *asUInt16;
1497 const uint32_t *asUInt32;
1500 unsigned CharByteWidth : 4;
1502 unsigned IsPascal : 1;
1503 unsigned NumConcatenated;
1504 SourceLocation TokLocs[1];
1506 StringLiteral(QualType Ty) :
1507 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false,
1510 static int mapCharByteWidth(TargetInfo const &target,StringKind k);
1513 /// This is the "fully general" constructor that allows representation of
1514 /// strings formed from multiple concatenated tokens.
1515 static StringLiteral *Create(const ASTContext &C, StringRef Str,
1516 StringKind Kind, bool Pascal, QualType Ty,
1517 const SourceLocation *Loc, unsigned NumStrs);
1519 /// Simple constructor for string literals made from one token.
1520 static StringLiteral *Create(const ASTContext &C, StringRef Str,
1521 StringKind Kind, bool Pascal, QualType Ty,
1522 SourceLocation Loc) {
1523 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1);
1526 /// \brief Construct an empty string literal.
1527 static StringLiteral *CreateEmpty(const ASTContext &C, unsigned NumStrs);
1529 StringRef getString() const {
1530 assert(CharByteWidth==1
1531 && "This function is used in places that assume strings use char");
1532 return StringRef(StrData.asChar, getByteLength());
1535 /// Allow access to clients that need the byte representation, such as
1536 /// ASTWriterStmt::VisitStringLiteral().
1537 StringRef getBytes() const {
1538 // FIXME: StringRef may not be the right type to use as a result for this.
1539 if (CharByteWidth == 1)
1540 return StringRef(StrData.asChar, getByteLength());
1541 if (CharByteWidth == 4)
1542 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32),
1544 assert(CharByteWidth == 2 && "unsupported CharByteWidth");
1545 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16),
1549 void outputString(raw_ostream &OS) const;
1551 uint32_t getCodeUnit(size_t i) const {
1552 assert(i < Length && "out of bounds access");
1553 if (CharByteWidth == 1)
1554 return static_cast<unsigned char>(StrData.asChar[i]);
1555 if (CharByteWidth == 4)
1556 return StrData.asUInt32[i];
1557 assert(CharByteWidth == 2 && "unsupported CharByteWidth");
1558 return StrData.asUInt16[i];
1561 unsigned getByteLength() const { return CharByteWidth*Length; }
1562 unsigned getLength() const { return Length; }
1563 unsigned getCharByteWidth() const { return CharByteWidth; }
1565 /// \brief Sets the string data to the given string data.
1566 void setString(const ASTContext &C, StringRef Str,
1567 StringKind Kind, bool IsPascal);
1569 StringKind getKind() const { return static_cast<StringKind>(Kind); }
1572 bool isAscii() const { return Kind == Ascii; }
1573 bool isWide() const { return Kind == Wide; }
1574 bool isUTF8() const { return Kind == UTF8; }
1575 bool isUTF16() const { return Kind == UTF16; }
1576 bool isUTF32() const { return Kind == UTF32; }
1577 bool isPascal() const { return IsPascal; }
1579 bool containsNonAsciiOrNull() const {
1580 StringRef Str = getString();
1581 for (unsigned i = 0, e = Str.size(); i != e; ++i)
1582 if (!isASCII(Str[i]) || !Str[i])
1587 /// getNumConcatenated - Get the number of string literal tokens that were
1588 /// concatenated in translation phase #6 to form this string literal.
1589 unsigned getNumConcatenated() const { return NumConcatenated; }
1591 SourceLocation getStrTokenLoc(unsigned TokNum) const {
1592 assert(TokNum < NumConcatenated && "Invalid tok number");
1593 return TokLocs[TokNum];
1595 void setStrTokenLoc(unsigned TokNum, SourceLocation L) {
1596 assert(TokNum < NumConcatenated && "Invalid tok number");
1597 TokLocs[TokNum] = L;
1600 /// getLocationOfByte - Return a source location that points to the specified
1601 /// byte of this string literal.
1603 /// Strings are amazingly complex. They can be formed from multiple tokens
1604 /// and can have escape sequences in them in addition to the usual trigraph
1605 /// and escaped newline business. This routine handles this complexity.
1608 getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
1609 const LangOptions &Features, const TargetInfo &Target,
1610 unsigned *StartToken = nullptr,
1611 unsigned *StartTokenByteOffset = nullptr) const;
1613 typedef const SourceLocation *tokloc_iterator;
1614 tokloc_iterator tokloc_begin() const { return TokLocs; }
1615 tokloc_iterator tokloc_end() const { return TokLocs + NumConcatenated; }
1617 SourceLocation getLocStart() const LLVM_READONLY { return TokLocs[0]; }
1618 SourceLocation getLocEnd() const LLVM_READONLY {
1619 return TokLocs[NumConcatenated - 1];
1622 static bool classof(const Stmt *T) {
1623 return T->getStmtClass() == StringLiteralClass;
1627 child_range children() {
1628 return child_range(child_iterator(), child_iterator());
1632 /// ParenExpr - This represents a parethesized expression, e.g. "(1)". This
1633 /// AST node is only formed if full location information is requested.
1634 class ParenExpr : public Expr {
1635 SourceLocation L, R;
1638 ParenExpr(SourceLocation l, SourceLocation r, Expr *val)
1639 : Expr(ParenExprClass, val->getType(),
1640 val->getValueKind(), val->getObjectKind(),
1641 val->isTypeDependent(), val->isValueDependent(),
1642 val->isInstantiationDependent(),
1643 val->containsUnexpandedParameterPack()),
1644 L(l), R(r), Val(val) {}
1646 /// \brief Construct an empty parenthesized expression.
1647 explicit ParenExpr(EmptyShell Empty)
1648 : Expr(ParenExprClass, Empty) { }
1650 const Expr *getSubExpr() const { return cast<Expr>(Val); }
1651 Expr *getSubExpr() { return cast<Expr>(Val); }
1652 void setSubExpr(Expr *E) { Val = E; }
1654 SourceLocation getLocStart() const LLVM_READONLY { return L; }
1655 SourceLocation getLocEnd() const LLVM_READONLY { return R; }
1657 /// \brief Get the location of the left parentheses '('.
1658 SourceLocation getLParen() const { return L; }
1659 void setLParen(SourceLocation Loc) { L = Loc; }
1661 /// \brief Get the location of the right parentheses ')'.
1662 SourceLocation getRParen() const { return R; }
1663 void setRParen(SourceLocation Loc) { R = Loc; }
1665 static bool classof(const Stmt *T) {
1666 return T->getStmtClass() == ParenExprClass;
1670 child_range children() { return child_range(&Val, &Val+1); }
1673 /// UnaryOperator - This represents the unary-expression's (except sizeof and
1674 /// alignof), the postinc/postdec operators from postfix-expression, and various
1677 /// Notes on various nodes:
1679 /// Real/Imag - These return the real/imag part of a complex operand. If
1680 /// applied to a non-complex value, the former returns its operand and the
1681 /// later returns zero in the type of the operand.
1683 class UnaryOperator : public Expr {
1685 typedef UnaryOperatorKind Opcode;
1693 UnaryOperator(Expr *input, Opcode opc, QualType type,
1694 ExprValueKind VK, ExprObjectKind OK, SourceLocation l)
1695 : Expr(UnaryOperatorClass, type, VK, OK,
1696 input->isTypeDependent() || type->isDependentType(),
1697 input->isValueDependent(),
1698 (input->isInstantiationDependent() ||
1699 type->isInstantiationDependentType()),
1700 input->containsUnexpandedParameterPack()),
1701 Opc(opc), Loc(l), Val(input) {}
1703 /// \brief Build an empty unary operator.
1704 explicit UnaryOperator(EmptyShell Empty)
1705 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { }
1707 Opcode getOpcode() const { return static_cast<Opcode>(Opc); }
1708 void setOpcode(Opcode O) { Opc = O; }
1710 Expr *getSubExpr() const { return cast<Expr>(Val); }
1711 void setSubExpr(Expr *E) { Val = E; }
1713 /// getOperatorLoc - Return the location of the operator.
1714 SourceLocation getOperatorLoc() const { return Loc; }
1715 void setOperatorLoc(SourceLocation L) { Loc = L; }
1717 /// isPostfix - Return true if this is a postfix operation, like x++.
1718 static bool isPostfix(Opcode Op) {
1719 return Op == UO_PostInc || Op == UO_PostDec;
1722 /// isPrefix - Return true if this is a prefix operation, like --x.
1723 static bool isPrefix(Opcode Op) {
1724 return Op == UO_PreInc || Op == UO_PreDec;
1727 bool isPrefix() const { return isPrefix(getOpcode()); }
1728 bool isPostfix() const { return isPostfix(getOpcode()); }
1730 static bool isIncrementOp(Opcode Op) {
1731 return Op == UO_PreInc || Op == UO_PostInc;
1733 bool isIncrementOp() const {
1734 return isIncrementOp(getOpcode());
1737 static bool isDecrementOp(Opcode Op) {
1738 return Op == UO_PreDec || Op == UO_PostDec;
1740 bool isDecrementOp() const {
1741 return isDecrementOp(getOpcode());
1744 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; }
1745 bool isIncrementDecrementOp() const {
1746 return isIncrementDecrementOp(getOpcode());
1749 static bool isArithmeticOp(Opcode Op) {
1750 return Op >= UO_Plus && Op <= UO_LNot;
1752 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); }
1754 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1755 /// corresponds to, e.g. "sizeof" or "[pre]++"
1756 static StringRef getOpcodeStr(Opcode Op);
1758 /// \brief Retrieve the unary opcode that corresponds to the given
1759 /// overloaded operator.
1760 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix);
1762 /// \brief Retrieve the overloaded operator kind that corresponds to
1763 /// the given unary opcode.
1764 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc);
1766 SourceLocation getLocStart() const LLVM_READONLY {
1767 return isPostfix() ? Val->getLocStart() : Loc;
1769 SourceLocation getLocEnd() const LLVM_READONLY {
1770 return isPostfix() ? Loc : Val->getLocEnd();
1772 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; }
1774 static bool classof(const Stmt *T) {
1775 return T->getStmtClass() == UnaryOperatorClass;
1779 child_range children() { return child_range(&Val, &Val+1); }
1782 /// Helper class for OffsetOfExpr.
1784 // __builtin_offsetof(type, identifier(.identifier|[expr])*)
1785 class OffsetOfNode {
1787 /// \brief The kind of offsetof node we have.
1789 /// \brief An index into an array.
1793 /// \brief A field in a dependent type, known only by its name.
1795 /// \brief An implicit indirection through a C++ base class, when the
1796 /// field found is in a base class.
1801 enum { MaskBits = 2, Mask = 0x03 };
1803 /// \brief The source range that covers this part of the designator.
1806 /// \brief The data describing the designator, which comes in three
1807 /// different forms, depending on the lower two bits.
1808 /// - An unsigned index into the array of Expr*'s stored after this node
1809 /// in memory, for [constant-expression] designators.
1810 /// - A FieldDecl*, for references to a known field.
1811 /// - An IdentifierInfo*, for references to a field with a given name
1812 /// when the class type is dependent.
1813 /// - A CXXBaseSpecifier*, for references that look at a field in a
1818 /// \brief Create an offsetof node that refers to an array element.
1819 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index,
1820 SourceLocation RBracketLoc)
1821 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) {}
1823 /// \brief Create an offsetof node that refers to a field.
1824 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, SourceLocation NameLoc)
1825 : Range(DotLoc.isValid() ? DotLoc : NameLoc, NameLoc),
1826 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) {}
1828 /// \brief Create an offsetof node that refers to an identifier.
1829 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name,
1830 SourceLocation NameLoc)
1831 : Range(DotLoc.isValid() ? DotLoc : NameLoc, NameLoc),
1832 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) {}
1834 /// \brief Create an offsetof node that refers into a C++ base class.
1835 explicit OffsetOfNode(const CXXBaseSpecifier *Base)
1836 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {}
1838 /// \brief Determine what kind of offsetof node this is.
1839 Kind getKind() const { return static_cast<Kind>(Data & Mask); }
1841 /// \brief For an array element node, returns the index into the array
1843 unsigned getArrayExprIndex() const {
1844 assert(getKind() == Array);
1848 /// \brief For a field offsetof node, returns the field.
1849 FieldDecl *getField() const {
1850 assert(getKind() == Field);
1851 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask);
1854 /// \brief For a field or identifier offsetof node, returns the name of
1856 IdentifierInfo *getFieldName() const;
1858 /// \brief For a base class node, returns the base specifier.
1859 CXXBaseSpecifier *getBase() const {
1860 assert(getKind() == Base);
1861 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask);
1864 /// \brief Retrieve the source range that covers this offsetof node.
1866 /// For an array element node, the source range contains the locations of
1867 /// the square brackets. For a field or identifier node, the source range
1868 /// contains the location of the period (if there is one) and the
1870 SourceRange getSourceRange() const LLVM_READONLY { return Range; }
1871 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); }
1872 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); }
1875 /// OffsetOfExpr - [C99 7.17] - This represents an expression of the form
1876 /// offsetof(record-type, member-designator). For example, given:
1887 /// we can represent and evaluate the expression @c offsetof(struct T, s[2].d).
1889 class OffsetOfExpr final
1891 private llvm::TrailingObjects<OffsetOfExpr, OffsetOfNode, Expr *> {
1892 SourceLocation OperatorLoc, RParenLoc;
1894 TypeSourceInfo *TSInfo;
1895 // Number of sub-components (i.e. instances of OffsetOfNode).
1897 // Number of sub-expressions (i.e. array subscript expressions).
1900 size_t numTrailingObjects(OverloadToken<OffsetOfNode>) const {
1904 OffsetOfExpr(const ASTContext &C, QualType type,
1905 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
1906 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs,
1907 SourceLocation RParenLoc);
1909 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs)
1910 : Expr(OffsetOfExprClass, EmptyShell()),
1911 TSInfo(nullptr), NumComps(numComps), NumExprs(numExprs) {}
1915 static OffsetOfExpr *Create(const ASTContext &C, QualType type,
1916 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
1917 ArrayRef<OffsetOfNode> comps,
1918 ArrayRef<Expr*> exprs, SourceLocation RParenLoc);
1920 static OffsetOfExpr *CreateEmpty(const ASTContext &C,
1921 unsigned NumComps, unsigned NumExprs);
1923 /// getOperatorLoc - Return the location of the operator.
1924 SourceLocation getOperatorLoc() const { return OperatorLoc; }
1925 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; }
1927 /// \brief Return the location of the right parentheses.
1928 SourceLocation getRParenLoc() const { return RParenLoc; }
1929 void setRParenLoc(SourceLocation R) { RParenLoc = R; }
1931 TypeSourceInfo *getTypeSourceInfo() const {
1934 void setTypeSourceInfo(TypeSourceInfo *tsi) {
1938 const OffsetOfNode &getComponent(unsigned Idx) const {
1939 assert(Idx < NumComps && "Subscript out of range");
1940 return getTrailingObjects<OffsetOfNode>()[Idx];
1943 void setComponent(unsigned Idx, OffsetOfNode ON) {
1944 assert(Idx < NumComps && "Subscript out of range");
1945 getTrailingObjects<OffsetOfNode>()[Idx] = ON;
1948 unsigned getNumComponents() const {
1952 Expr* getIndexExpr(unsigned Idx) {
1953 assert(Idx < NumExprs && "Subscript out of range");
1954 return getTrailingObjects<Expr *>()[Idx];
1957 const Expr *getIndexExpr(unsigned Idx) const {
1958 assert(Idx < NumExprs && "Subscript out of range");
1959 return getTrailingObjects<Expr *>()[Idx];
1962 void setIndexExpr(unsigned Idx, Expr* E) {
1963 assert(Idx < NumComps && "Subscript out of range");
1964 getTrailingObjects<Expr *>()[Idx] = E;
1967 unsigned getNumExpressions() const {
1971 SourceLocation getLocStart() const LLVM_READONLY { return OperatorLoc; }
1972 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
1974 static bool classof(const Stmt *T) {
1975 return T->getStmtClass() == OffsetOfExprClass;
1979 child_range children() {
1980 Stmt **begin = reinterpret_cast<Stmt **>(getTrailingObjects<Expr *>());
1981 return child_range(begin, begin + NumExprs);
1983 friend TrailingObjects;
1986 /// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated)
1987 /// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and
1988 /// vec_step (OpenCL 1.1 6.11.12).
1989 class UnaryExprOrTypeTraitExpr : public Expr {
1994 SourceLocation OpLoc, RParenLoc;
1997 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo,
1998 QualType resultType, SourceLocation op,
1999 SourceLocation rp) :
2000 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary,
2001 false, // Never type-dependent (C++ [temp.dep.expr]p3).
2002 // Value-dependent if the argument is type-dependent.
2003 TInfo->getType()->isDependentType(),
2004 TInfo->getType()->isInstantiationDependentType(),
2005 TInfo->getType()->containsUnexpandedParameterPack()),
2006 OpLoc(op), RParenLoc(rp) {
2007 UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
2008 UnaryExprOrTypeTraitExprBits.IsType = true;
2009 Argument.Ty = TInfo;
2012 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E,
2013 QualType resultType, SourceLocation op,
2016 /// \brief Construct an empty sizeof/alignof expression.
2017 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty)
2018 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { }
2020 UnaryExprOrTypeTrait getKind() const {
2021 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind);
2023 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;}
2025 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; }
2026 QualType getArgumentType() const {
2027 return getArgumentTypeInfo()->getType();
2029 TypeSourceInfo *getArgumentTypeInfo() const {
2030 assert(isArgumentType() && "calling getArgumentType() when arg is expr");
2033 Expr *getArgumentExpr() {
2034 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type");
2035 return static_cast<Expr*>(Argument.Ex);
2037 const Expr *getArgumentExpr() const {
2038 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr();
2041 void setArgument(Expr *E) {
2043 UnaryExprOrTypeTraitExprBits.IsType = false;
2045 void setArgument(TypeSourceInfo *TInfo) {
2046 Argument.Ty = TInfo;
2047 UnaryExprOrTypeTraitExprBits.IsType = true;
2050 /// Gets the argument type, or the type of the argument expression, whichever
2052 QualType getTypeOfArgument() const {
2053 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType();
2056 SourceLocation getOperatorLoc() const { return OpLoc; }
2057 void setOperatorLoc(SourceLocation L) { OpLoc = L; }
2059 SourceLocation getRParenLoc() const { return RParenLoc; }
2060 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
2062 SourceLocation getLocStart() const LLVM_READONLY { return OpLoc; }
2063 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
2065 static bool classof(const Stmt *T) {
2066 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass;
2070 child_range children();
2073 //===----------------------------------------------------------------------===//
2074 // Postfix Operators.
2075 //===----------------------------------------------------------------------===//
2077 /// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting.
2078 class ArraySubscriptExpr : public Expr {
2079 enum { LHS, RHS, END_EXPR=2 };
2080 Stmt* SubExprs[END_EXPR];
2081 SourceLocation RBracketLoc;
2083 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t,
2084 ExprValueKind VK, ExprObjectKind OK,
2085 SourceLocation rbracketloc)
2086 : Expr(ArraySubscriptExprClass, t, VK, OK,
2087 lhs->isTypeDependent() || rhs->isTypeDependent(),
2088 lhs->isValueDependent() || rhs->isValueDependent(),
2089 (lhs->isInstantiationDependent() ||
2090 rhs->isInstantiationDependent()),
2091 (lhs->containsUnexpandedParameterPack() ||
2092 rhs->containsUnexpandedParameterPack())),
2093 RBracketLoc(rbracketloc) {
2094 SubExprs[LHS] = lhs;
2095 SubExprs[RHS] = rhs;
2098 /// \brief Create an empty array subscript expression.
2099 explicit ArraySubscriptExpr(EmptyShell Shell)
2100 : Expr(ArraySubscriptExprClass, Shell) { }
2102 /// An array access can be written A[4] or 4[A] (both are equivalent).
2103 /// - getBase() and getIdx() always present the normalized view: A[4].
2104 /// In this case getBase() returns "A" and getIdx() returns "4".
2105 /// - getLHS() and getRHS() present the syntactic view. e.g. for
2106 /// 4[A] getLHS() returns "4".
2107 /// Note: Because vector element access is also written A[4] we must
2108 /// predicate the format conversion in getBase and getIdx only on the
2109 /// the type of the RHS, as it is possible for the LHS to be a vector of
2111 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); }
2112 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
2113 void setLHS(Expr *E) { SubExprs[LHS] = E; }
2115 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); }
2116 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
2117 void setRHS(Expr *E) { SubExprs[RHS] = E; }
2120 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS());
2123 const Expr *getBase() const {
2124 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS());
2128 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS());
2131 const Expr *getIdx() const {
2132 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS());
2135 SourceLocation getLocStart() const LLVM_READONLY {
2136 return getLHS()->getLocStart();
2138 SourceLocation getLocEnd() const LLVM_READONLY { return RBracketLoc; }
2140 SourceLocation getRBracketLoc() const { return RBracketLoc; }
2141 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; }
2143 SourceLocation getExprLoc() const LLVM_READONLY {
2144 return getBase()->getExprLoc();
2147 static bool classof(const Stmt *T) {
2148 return T->getStmtClass() == ArraySubscriptExprClass;
2152 child_range children() {
2153 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
2157 /// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
2158 /// CallExpr itself represents a normal function call, e.g., "f(x, 2)",
2159 /// while its subclasses may represent alternative syntax that (semantically)
2160 /// results in a function call. For example, CXXOperatorCallExpr is
2161 /// a subclass for overloaded operator calls that use operator syntax, e.g.,
2162 /// "str1 + str2" to resolve to a function call.
2163 class CallExpr : public Expr {
2164 enum { FN=0, PREARGS_START=1 };
2167 SourceLocation RParenLoc;
2169 void updateDependenciesFromArg(Expr *Arg);
2172 // These versions of the constructor are for derived classes.
2173 CallExpr(const ASTContext &C, StmtClass SC, Expr *fn,
2174 ArrayRef<Expr *> preargs, ArrayRef<Expr *> args, QualType t,
2175 ExprValueKind VK, SourceLocation rparenloc);
2176 CallExpr(const ASTContext &C, StmtClass SC, Expr *fn, ArrayRef<Expr *> args,
2177 QualType t, ExprValueKind VK, SourceLocation rparenloc);
2178 CallExpr(const ASTContext &C, StmtClass SC, unsigned NumPreArgs,
2181 Stmt *getPreArg(unsigned i) {
2182 assert(i < getNumPreArgs() && "Prearg access out of range!");
2183 return SubExprs[PREARGS_START+i];
2185 const Stmt *getPreArg(unsigned i) const {
2186 assert(i < getNumPreArgs() && "Prearg access out of range!");
2187 return SubExprs[PREARGS_START+i];
2189 void setPreArg(unsigned i, Stmt *PreArg) {
2190 assert(i < getNumPreArgs() && "Prearg access out of range!");
2191 SubExprs[PREARGS_START+i] = PreArg;
2194 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; }
2197 CallExpr(const ASTContext& C, Expr *fn, ArrayRef<Expr*> args, QualType t,
2198 ExprValueKind VK, SourceLocation rparenloc);
2200 /// \brief Build an empty call expression.
2201 CallExpr(const ASTContext &C, StmtClass SC, EmptyShell Empty);
2203 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); }
2204 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); }
2205 void setCallee(Expr *F) { SubExprs[FN] = F; }
2207 Decl *getCalleeDecl();
2208 const Decl *getCalleeDecl() const {
2209 return const_cast<CallExpr*>(this)->getCalleeDecl();
2212 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0.
2213 FunctionDecl *getDirectCallee();
2214 const FunctionDecl *getDirectCallee() const {
2215 return const_cast<CallExpr*>(this)->getDirectCallee();
2218 /// getNumArgs - Return the number of actual arguments to this call.
2220 unsigned getNumArgs() const { return NumArgs; }
2222 /// \brief Retrieve the call arguments.
2224 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START);
2226 const Expr *const *getArgs() const {
2227 return reinterpret_cast<Expr **>(SubExprs + getNumPreArgs() +
2231 /// getArg - Return the specified argument.
2232 Expr *getArg(unsigned Arg) {
2233 assert(Arg < NumArgs && "Arg access out of range!");
2234 return cast_or_null<Expr>(SubExprs[Arg + getNumPreArgs() + PREARGS_START]);
2236 const Expr *getArg(unsigned Arg) const {
2237 assert(Arg < NumArgs && "Arg access out of range!");
2238 return cast_or_null<Expr>(SubExprs[Arg + getNumPreArgs() + PREARGS_START]);
2241 /// setArg - Set the specified argument.
2242 void setArg(unsigned Arg, Expr *ArgExpr) {
2243 assert(Arg < NumArgs && "Arg access out of range!");
2244 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr;
2247 /// setNumArgs - This changes the number of arguments present in this call.
2248 /// Any orphaned expressions are deleted by this, and any new operands are set
2250 void setNumArgs(const ASTContext& C, unsigned NumArgs);
2252 typedef ExprIterator arg_iterator;
2253 typedef ConstExprIterator const_arg_iterator;
2254 typedef llvm::iterator_range<arg_iterator> arg_range;
2255 typedef llvm::iterator_range<const_arg_iterator> arg_const_range;
2257 arg_range arguments() { return arg_range(arg_begin(), arg_end()); }
2258 arg_const_range arguments() const {
2259 return arg_const_range(arg_begin(), arg_end());
2262 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); }
2263 arg_iterator arg_end() {
2264 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs();
2266 const_arg_iterator arg_begin() const {
2267 return SubExprs+PREARGS_START+getNumPreArgs();
2269 const_arg_iterator arg_end() const {
2270 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs();
2273 /// This method provides fast access to all the subexpressions of
2274 /// a CallExpr without going through the slower virtual child_iterator
2275 /// interface. This provides efficient reverse iteration of the
2276 /// subexpressions. This is currently used for CFG construction.
2277 ArrayRef<Stmt*> getRawSubExprs() {
2278 return llvm::makeArrayRef(SubExprs,
2279 getNumPreArgs() + PREARGS_START + getNumArgs());
2282 /// getNumCommas - Return the number of commas that must have been present in
2283 /// this function call.
2284 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; }
2286 /// getBuiltinCallee - If this is a call to a builtin, return the builtin ID
2287 /// of the callee. If not, return 0.
2288 unsigned getBuiltinCallee() const;
2290 /// \brief Returns \c true if this is a call to a builtin which does not
2291 /// evaluate side-effects within its arguments.
2292 bool isUnevaluatedBuiltinCall(const ASTContext &Ctx) const;
2294 /// getCallReturnType - Get the return type of the call expr. This is not
2295 /// always the type of the expr itself, if the return type is a reference
2297 QualType getCallReturnType(const ASTContext &Ctx) const;
2299 SourceLocation getRParenLoc() const { return RParenLoc; }
2300 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
2302 SourceLocation getLocStart() const LLVM_READONLY;
2303 SourceLocation getLocEnd() const LLVM_READONLY;
2305 static bool classof(const Stmt *T) {
2306 return T->getStmtClass() >= firstCallExprConstant &&
2307 T->getStmtClass() <= lastCallExprConstant;
2311 child_range children() {
2312 return child_range(&SubExprs[0],
2313 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START);
2317 /// Extra data stored in some MemberExpr objects.
2318 struct MemberExprNameQualifier {
2319 /// \brief The nested-name-specifier that qualifies the name, including
2320 /// source-location information.
2321 NestedNameSpecifierLoc QualifierLoc;
2323 /// \brief The DeclAccessPair through which the MemberDecl was found due to
2324 /// name qualifiers.
2325 DeclAccessPair FoundDecl;
2328 /// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F.
2330 class MemberExpr final
2332 private llvm::TrailingObjects<MemberExpr, MemberExprNameQualifier,
2333 ASTTemplateKWAndArgsInfo,
2334 TemplateArgumentLoc> {
2335 /// Base - the expression for the base pointer or structure references. In
2336 /// X.F, this is "X".
2339 /// MemberDecl - This is the decl being referenced by the field/member name.
2340 /// In X.F, this is the decl referenced by F.
2341 ValueDecl *MemberDecl;
2343 /// MemberDNLoc - Provides source/type location info for the
2344 /// declaration name embedded in MemberDecl.
2345 DeclarationNameLoc MemberDNLoc;
2347 /// MemberLoc - This is the location of the member name.
2348 SourceLocation MemberLoc;
2350 /// This is the location of the -> or . in the expression.
2351 SourceLocation OperatorLoc;
2353 /// IsArrow - True if this is "X->F", false if this is "X.F".
2356 /// \brief True if this member expression used a nested-name-specifier to
2357 /// refer to the member, e.g., "x->Base::f", or found its member via a using
2358 /// declaration. When true, a MemberExprNameQualifier
2359 /// structure is allocated immediately after the MemberExpr.
2360 bool HasQualifierOrFoundDecl : 1;
2362 /// \brief True if this member expression specified a template keyword
2363 /// and/or a template argument list explicitly, e.g., x->f<int>,
2364 /// x->template f, x->template f<int>.
2365 /// When true, an ASTTemplateKWAndArgsInfo structure and its
2366 /// TemplateArguments (if any) are present.
2367 bool HasTemplateKWAndArgsInfo : 1;
2369 /// \brief True if this member expression refers to a method that
2370 /// was resolved from an overloaded set having size greater than 1.
2371 bool HadMultipleCandidates : 1;
2373 size_t numTrailingObjects(OverloadToken<MemberExprNameQualifier>) const {
2374 return HasQualifierOrFoundDecl ? 1 : 0;
2377 size_t numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>) const {
2378 return HasTemplateKWAndArgsInfo ? 1 : 0;
2382 MemberExpr(Expr *base, bool isarrow, SourceLocation operatorloc,
2383 ValueDecl *memberdecl, const DeclarationNameInfo &NameInfo,
2384 QualType ty, ExprValueKind VK, ExprObjectKind OK)
2385 : Expr(MemberExprClass, ty, VK, OK, base->isTypeDependent(),
2386 base->isValueDependent(), base->isInstantiationDependent(),
2387 base->containsUnexpandedParameterPack()),
2388 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()),
2389 MemberLoc(NameInfo.getLoc()), OperatorLoc(operatorloc),
2390 IsArrow(isarrow), HasQualifierOrFoundDecl(false),
2391 HasTemplateKWAndArgsInfo(false), HadMultipleCandidates(false) {
2392 assert(memberdecl->getDeclName() == NameInfo.getName());
2395 // NOTE: this constructor should be used only when it is known that
2396 // the member name can not provide additional syntactic info
2397 // (i.e., source locations for C++ operator names or type source info
2398 // for constructors, destructors and conversion operators).
2399 MemberExpr(Expr *base, bool isarrow, SourceLocation operatorloc,
2400 ValueDecl *memberdecl, SourceLocation l, QualType ty,
2401 ExprValueKind VK, ExprObjectKind OK)
2402 : Expr(MemberExprClass, ty, VK, OK, base->isTypeDependent(),
2403 base->isValueDependent(), base->isInstantiationDependent(),
2404 base->containsUnexpandedParameterPack()),
2405 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l),
2406 OperatorLoc(operatorloc), IsArrow(isarrow),
2407 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false),
2408 HadMultipleCandidates(false) {}
2410 static MemberExpr *Create(const ASTContext &C, Expr *base, bool isarrow,
2411 SourceLocation OperatorLoc,
2412 NestedNameSpecifierLoc QualifierLoc,
2413 SourceLocation TemplateKWLoc, ValueDecl *memberdecl,
2414 DeclAccessPair founddecl,
2415 DeclarationNameInfo MemberNameInfo,
2416 const TemplateArgumentListInfo *targs, QualType ty,
2417 ExprValueKind VK, ExprObjectKind OK);
2419 void setBase(Expr *E) { Base = E; }
2420 Expr *getBase() const { return cast<Expr>(Base); }
2422 /// \brief Retrieve the member declaration to which this expression refers.
2424 /// The returned declaration will be a FieldDecl or (in C++) a VarDecl (for
2425 /// static data members), a CXXMethodDecl, or an EnumConstantDecl.
2426 ValueDecl *getMemberDecl() const { return MemberDecl; }
2427 void setMemberDecl(ValueDecl *D) { MemberDecl = D; }
2429 /// \brief Retrieves the declaration found by lookup.
2430 DeclAccessPair getFoundDecl() const {
2431 if (!HasQualifierOrFoundDecl)
2432 return DeclAccessPair::make(getMemberDecl(),
2433 getMemberDecl()->getAccess());
2434 return getTrailingObjects<MemberExprNameQualifier>()->FoundDecl;
2437 /// \brief Determines whether this member expression actually had
2438 /// a C++ nested-name-specifier prior to the name of the member, e.g.,
2440 bool hasQualifier() const { return getQualifier() != nullptr; }
2442 /// \brief If the member name was qualified, retrieves the
2443 /// nested-name-specifier that precedes the member name, with source-location
2445 NestedNameSpecifierLoc getQualifierLoc() const {
2446 if (!HasQualifierOrFoundDecl)
2447 return NestedNameSpecifierLoc();
2449 return getTrailingObjects<MemberExprNameQualifier>()->QualifierLoc;
2452 /// \brief If the member name was qualified, retrieves the
2453 /// nested-name-specifier that precedes the member name. Otherwise, returns
2455 NestedNameSpecifier *getQualifier() const {
2456 return getQualifierLoc().getNestedNameSpecifier();
2459 /// \brief Retrieve the location of the template keyword preceding
2460 /// the member name, if any.
2461 SourceLocation getTemplateKeywordLoc() const {
2462 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2463 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->TemplateKWLoc;
2466 /// \brief Retrieve the location of the left angle bracket starting the
2467 /// explicit template argument list following the member name, if any.
2468 SourceLocation getLAngleLoc() const {
2469 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2470 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->LAngleLoc;
2473 /// \brief Retrieve the location of the right angle bracket ending the
2474 /// explicit template argument list following the member name, if any.
2475 SourceLocation getRAngleLoc() const {
2476 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2477 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->RAngleLoc;
2480 /// Determines whether the member name was preceded by the template keyword.
2481 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }
2483 /// \brief Determines whether the member name was followed by an
2484 /// explicit template argument list.
2485 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }
2487 /// \brief Copies the template arguments (if present) into the given
2489 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
2490 if (hasExplicitTemplateArgs())
2491 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->copyInto(
2492 getTrailingObjects<TemplateArgumentLoc>(), List);
2495 /// \brief Retrieve the template arguments provided as part of this
2497 const TemplateArgumentLoc *getTemplateArgs() const {
2498 if (!hasExplicitTemplateArgs())
2501 return getTrailingObjects<TemplateArgumentLoc>();
2504 /// \brief Retrieve the number of template arguments provided as part of this
2506 unsigned getNumTemplateArgs() const {
2507 if (!hasExplicitTemplateArgs())
2510 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->NumTemplateArgs;
2513 ArrayRef<TemplateArgumentLoc> template_arguments() const {
2514 return {getTemplateArgs(), getNumTemplateArgs()};
2517 /// \brief Retrieve the member declaration name info.
2518 DeclarationNameInfo getMemberNameInfo() const {
2519 return DeclarationNameInfo(MemberDecl->getDeclName(),
2520 MemberLoc, MemberDNLoc);
2523 SourceLocation getOperatorLoc() const LLVM_READONLY { return OperatorLoc; }
2525 bool isArrow() const { return IsArrow; }
2526 void setArrow(bool A) { IsArrow = A; }
2528 /// getMemberLoc - Return the location of the "member", in X->F, it is the
2529 /// location of 'F'.
2530 SourceLocation getMemberLoc() const { return MemberLoc; }
2531 void setMemberLoc(SourceLocation L) { MemberLoc = L; }
2533 SourceLocation getLocStart() const LLVM_READONLY;
2534 SourceLocation getLocEnd() const LLVM_READONLY;
2536 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; }
2538 /// \brief Determine whether the base of this explicit is implicit.
2539 bool isImplicitAccess() const {
2540 return getBase() && getBase()->isImplicitCXXThis();
2543 /// \brief Returns true if this member expression refers to a method that
2544 /// was resolved from an overloaded set having size greater than 1.
2545 bool hadMultipleCandidates() const {
2546 return HadMultipleCandidates;
2548 /// \brief Sets the flag telling whether this expression refers to
2549 /// a method that was resolved from an overloaded set having size
2551 void setHadMultipleCandidates(bool V = true) {
2552 HadMultipleCandidates = V;
2555 /// \brief Returns true if virtual dispatch is performed.
2556 /// If the member access is fully qualified, (i.e. X::f()), virtual
2557 /// dispatching is not performed. In -fapple-kext mode qualified
2558 /// calls to virtual method will still go through the vtable.
2559 bool performsVirtualDispatch(const LangOptions &LO) const {
2560 return LO.AppleKext || !hasQualifier();
2563 static bool classof(const Stmt *T) {
2564 return T->getStmtClass() == MemberExprClass;
2568 child_range children() { return child_range(&Base, &Base+1); }
2570 friend TrailingObjects;
2571 friend class ASTReader;
2572 friend class ASTStmtWriter;
2575 /// CompoundLiteralExpr - [C99 6.5.2.5]
2577 class CompoundLiteralExpr : public Expr {
2578 /// LParenLoc - If non-null, this is the location of the left paren in a
2579 /// compound literal like "(int){4}". This can be null if this is a
2580 /// synthesized compound expression.
2581 SourceLocation LParenLoc;
2583 /// The type as written. This can be an incomplete array type, in
2584 /// which case the actual expression type will be different.
2585 /// The int part of the pair stores whether this expr is file scope.
2586 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope;
2589 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo,
2590 QualType T, ExprValueKind VK, Expr *init, bool fileScope)
2591 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary,
2592 tinfo->getType()->isDependentType(),
2593 init->isValueDependent(),
2594 (init->isInstantiationDependent() ||
2595 tinfo->getType()->isInstantiationDependentType()),
2596 init->containsUnexpandedParameterPack()),
2597 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {}
2599 /// \brief Construct an empty compound literal.
2600 explicit CompoundLiteralExpr(EmptyShell Empty)
2601 : Expr(CompoundLiteralExprClass, Empty) { }
2603 const Expr *getInitializer() const { return cast<Expr>(Init); }
2604 Expr *getInitializer() { return cast<Expr>(Init); }
2605 void setInitializer(Expr *E) { Init = E; }
2607 bool isFileScope() const { return TInfoAndScope.getInt(); }
2608 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); }
2610 SourceLocation getLParenLoc() const { return LParenLoc; }
2611 void setLParenLoc(SourceLocation L) { LParenLoc = L; }
2613 TypeSourceInfo *getTypeSourceInfo() const {
2614 return TInfoAndScope.getPointer();
2616 void setTypeSourceInfo(TypeSourceInfo *tinfo) {
2617 TInfoAndScope.setPointer(tinfo);
2620 SourceLocation getLocStart() const LLVM_READONLY {
2621 // FIXME: Init should never be null.
2623 return SourceLocation();
2624 if (LParenLoc.isInvalid())
2625 return Init->getLocStart();
2628 SourceLocation getLocEnd() const LLVM_READONLY {
2629 // FIXME: Init should never be null.
2631 return SourceLocation();
2632 return Init->getLocEnd();
2635 static bool classof(const Stmt *T) {
2636 return T->getStmtClass() == CompoundLiteralExprClass;
2640 child_range children() { return child_range(&Init, &Init+1); }
2643 /// CastExpr - Base class for type casts, including both implicit
2644 /// casts (ImplicitCastExpr) and explicit casts that have some
2645 /// representation in the source code (ExplicitCastExpr's derived
2647 class CastExpr : public Expr {
2651 bool CastConsistency() const;
2653 const CXXBaseSpecifier * const *path_buffer() const {
2654 return const_cast<CastExpr*>(this)->path_buffer();
2656 CXXBaseSpecifier **path_buffer();
2658 void setBasePathSize(unsigned basePathSize) {
2659 CastExprBits.BasePathSize = basePathSize;
2660 assert(CastExprBits.BasePathSize == basePathSize &&
2661 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!");
2665 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, const CastKind kind,
2666 Expr *op, unsigned BasePathSize)
2667 : Expr(SC, ty, VK, OK_Ordinary,
2668 // Cast expressions are type-dependent if the type is
2669 // dependent (C++ [temp.dep.expr]p3).
2670 ty->isDependentType(),
2671 // Cast expressions are value-dependent if the type is
2672 // dependent or if the subexpression is value-dependent.
2673 ty->isDependentType() || (op && op->isValueDependent()),
2674 (ty->isInstantiationDependentType() ||
2675 (op && op->isInstantiationDependent())),
2676 // An implicit cast expression doesn't (lexically) contain an
2677 // unexpanded pack, even if its target type does.
2678 ((SC != ImplicitCastExprClass &&
2679 ty->containsUnexpandedParameterPack()) ||
2680 (op && op->containsUnexpandedParameterPack()))),
2682 assert(kind != CK_Invalid && "creating cast with invalid cast kind");
2683 CastExprBits.Kind = kind;
2684 setBasePathSize(BasePathSize);
2685 assert(CastConsistency());
2688 /// \brief Construct an empty cast.
2689 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize)
2691 setBasePathSize(BasePathSize);
2695 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; }
2696 void setCastKind(CastKind K) { CastExprBits.Kind = K; }
2697 const char *getCastKindName() const;
2699 Expr *getSubExpr() { return cast<Expr>(Op); }
2700 const Expr *getSubExpr() const { return cast<Expr>(Op); }
2701 void setSubExpr(Expr *E) { Op = E; }
2703 /// \brief Retrieve the cast subexpression as it was written in the source
2704 /// code, looking through any implicit casts or other intermediate nodes
2705 /// introduced by semantic analysis.
2706 Expr *getSubExprAsWritten();
2707 const Expr *getSubExprAsWritten() const {
2708 return const_cast<CastExpr *>(this)->getSubExprAsWritten();
2711 typedef CXXBaseSpecifier **path_iterator;
2712 typedef const CXXBaseSpecifier * const *path_const_iterator;
2713 bool path_empty() const { return CastExprBits.BasePathSize == 0; }
2714 unsigned path_size() const { return CastExprBits.BasePathSize; }
2715 path_iterator path_begin() { return path_buffer(); }
2716 path_iterator path_end() { return path_buffer() + path_size(); }
2717 path_const_iterator path_begin() const { return path_buffer(); }
2718 path_const_iterator path_end() const { return path_buffer() + path_size(); }
2720 static bool classof(const Stmt *T) {
2721 return T->getStmtClass() >= firstCastExprConstant &&
2722 T->getStmtClass() <= lastCastExprConstant;
2726 child_range children() { return child_range(&Op, &Op+1); }
2729 /// ImplicitCastExpr - Allows us to explicitly represent implicit type
2730 /// conversions, which have no direct representation in the original
2731 /// source code. For example: converting T[]->T*, void f()->void
2732 /// (*f)(), float->double, short->int, etc.
2734 /// In C, implicit casts always produce rvalues. However, in C++, an
2735 /// implicit cast whose result is being bound to a reference will be
2736 /// an lvalue or xvalue. For example:
2740 /// class Derived : public Base { };
2741 /// Derived &&ref();
2742 /// void f(Derived d) {
2743 /// Base& b = d; // initializer is an ImplicitCastExpr
2744 /// // to an lvalue of type Base
2745 /// Base&& r = ref(); // initializer is an ImplicitCastExpr
2746 /// // to an xvalue of type Base
2749 class ImplicitCastExpr final
2751 private llvm::TrailingObjects<ImplicitCastExpr, CXXBaseSpecifier *> {
2753 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op,
2754 unsigned BasePathLength, ExprValueKind VK)
2755 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) {
2758 /// \brief Construct an empty implicit cast.
2759 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize)
2760 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { }
2763 enum OnStack_t { OnStack };
2764 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op,
2766 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) {
2769 static ImplicitCastExpr *Create(const ASTContext &Context, QualType T,
2770 CastKind Kind, Expr *Operand,
2771 const CXXCastPath *BasePath,
2774 static ImplicitCastExpr *CreateEmpty(const ASTContext &Context,
2777 SourceLocation getLocStart() const LLVM_READONLY {
2778 return getSubExpr()->getLocStart();
2780 SourceLocation getLocEnd() const LLVM_READONLY {
2781 return getSubExpr()->getLocEnd();
2784 static bool classof(const Stmt *T) {
2785 return T->getStmtClass() == ImplicitCastExprClass;
2788 friend TrailingObjects;
2789 friend class CastExpr;
2792 inline Expr *Expr::IgnoreImpCasts() {
2794 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
2795 e = ice->getSubExpr();
2799 /// ExplicitCastExpr - An explicit cast written in the source
2802 /// This class is effectively an abstract class, because it provides
2803 /// the basic representation of an explicitly-written cast without
2804 /// specifying which kind of cast (C cast, functional cast, static
2805 /// cast, etc.) was written; specific derived classes represent the
2806 /// particular style of cast and its location information.
2808 /// Unlike implicit casts, explicit cast nodes have two different
2809 /// types: the type that was written into the source code, and the
2810 /// actual type of the expression as determined by semantic
2811 /// analysis. These types may differ slightly. For example, in C++ one
2812 /// can cast to a reference type, which indicates that the resulting
2813 /// expression will be an lvalue or xvalue. The reference type, however,
2814 /// will not be used as the type of the expression.
2815 class ExplicitCastExpr : public CastExpr {
2816 /// TInfo - Source type info for the (written) type
2817 /// this expression is casting to.
2818 TypeSourceInfo *TInfo;
2821 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK,
2822 CastKind kind, Expr *op, unsigned PathSize,
2823 TypeSourceInfo *writtenTy)
2824 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {}
2826 /// \brief Construct an empty explicit cast.
2827 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize)
2828 : CastExpr(SC, Shell, PathSize) { }
2831 /// getTypeInfoAsWritten - Returns the type source info for the type
2832 /// that this expression is casting to.
2833 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; }
2834 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; }
2836 /// getTypeAsWritten - Returns the type that this expression is
2837 /// casting to, as written in the source code.
2838 QualType getTypeAsWritten() const { return TInfo->getType(); }
2840 static bool classof(const Stmt *T) {
2841 return T->getStmtClass() >= firstExplicitCastExprConstant &&
2842 T->getStmtClass() <= lastExplicitCastExprConstant;
2846 /// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style
2847 /// cast in C++ (C++ [expr.cast]), which uses the syntax
2848 /// (Type)expr. For example: @c (int)f.
2849 class CStyleCastExpr final
2850 : public ExplicitCastExpr,
2851 private llvm::TrailingObjects<CStyleCastExpr, CXXBaseSpecifier *> {
2852 SourceLocation LPLoc; // the location of the left paren
2853 SourceLocation RPLoc; // the location of the right paren
2855 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op,
2856 unsigned PathSize, TypeSourceInfo *writtenTy,
2857 SourceLocation l, SourceLocation r)
2858 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize,
2859 writtenTy), LPLoc(l), RPLoc(r) {}
2861 /// \brief Construct an empty C-style explicit cast.
2862 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize)
2863 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { }
2866 static CStyleCastExpr *Create(const ASTContext &Context, QualType T,
2867 ExprValueKind VK, CastKind K,
2868 Expr *Op, const CXXCastPath *BasePath,
2869 TypeSourceInfo *WrittenTy, SourceLocation L,
2872 static CStyleCastExpr *CreateEmpty(const ASTContext &Context,
2875 SourceLocation getLParenLoc() const { return LPLoc; }
2876 void setLParenLoc(SourceLocation L) { LPLoc = L; }
2878 SourceLocation getRParenLoc() const { return RPLoc; }
2879 void setRParenLoc(SourceLocation L) { RPLoc = L; }
2881 SourceLocation getLocStart() const LLVM_READONLY { return LPLoc; }
2882 SourceLocation getLocEnd() const LLVM_READONLY {
2883 return getSubExpr()->getLocEnd();
2886 static bool classof(const Stmt *T) {
2887 return T->getStmtClass() == CStyleCastExprClass;
2890 friend TrailingObjects;
2891 friend class CastExpr;
2894 /// \brief A builtin binary operation expression such as "x + y" or "x <= y".
2896 /// This expression node kind describes a builtin binary operation,
2897 /// such as "x + y" for integer values "x" and "y". The operands will
2898 /// already have been converted to appropriate types (e.g., by
2899 /// performing promotions or conversions).
2901 /// In C++, where operators may be overloaded, a different kind of
2902 /// expression node (CXXOperatorCallExpr) is used to express the
2903 /// invocation of an overloaded operator with operator syntax. Within
2904 /// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is
2905 /// used to store an expression "x + y" depends on the subexpressions
2906 /// for x and y. If neither x or y is type-dependent, and the "+"
2907 /// operator resolves to a built-in operation, BinaryOperator will be
2908 /// used to express the computation (x and y may still be
2909 /// value-dependent). If either x or y is type-dependent, or if the
2910 /// "+" resolves to an overloaded operator, CXXOperatorCallExpr will
2911 /// be used to express the computation.
2912 class BinaryOperator : public Expr {
2914 typedef BinaryOperatorKind Opcode;
2919 // Records the FP_CONTRACT pragma status at the point that this binary
2920 // operator was parsed. This bit is only meaningful for operations on
2921 // floating point types. For all other types it should default to
2923 unsigned FPContractable : 1;
2924 SourceLocation OpLoc;
2926 enum { LHS, RHS, END_EXPR };
2927 Stmt* SubExprs[END_EXPR];
2930 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy,
2931 ExprValueKind VK, ExprObjectKind OK,
2932 SourceLocation opLoc, bool fpContractable)
2933 : Expr(BinaryOperatorClass, ResTy, VK, OK,
2934 lhs->isTypeDependent() || rhs->isTypeDependent(),
2935 lhs->isValueDependent() || rhs->isValueDependent(),
2936 (lhs->isInstantiationDependent() ||
2937 rhs->isInstantiationDependent()),
2938 (lhs->containsUnexpandedParameterPack() ||
2939 rhs->containsUnexpandedParameterPack())),
2940 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) {
2941 SubExprs[LHS] = lhs;
2942 SubExprs[RHS] = rhs;
2943 assert(!isCompoundAssignmentOp() &&
2944 "Use CompoundAssignOperator for compound assignments");
2947 /// \brief Construct an empty binary operator.
2948 explicit BinaryOperator(EmptyShell Empty)
2949 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { }
2951 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; }
2952 SourceLocation getOperatorLoc() const { return OpLoc; }
2953 void setOperatorLoc(SourceLocation L) { OpLoc = L; }
2955 Opcode getOpcode() const { return static_cast<Opcode>(Opc); }
2956 void setOpcode(Opcode O) { Opc = O; }
2958 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
2959 void setLHS(Expr *E) { SubExprs[LHS] = E; }
2960 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
2961 void setRHS(Expr *E) { SubExprs[RHS] = E; }
2963 SourceLocation getLocStart() const LLVM_READONLY {
2964 return getLHS()->getLocStart();
2966 SourceLocation getLocEnd() const LLVM_READONLY {
2967 return getRHS()->getLocEnd();
2970 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
2971 /// corresponds to, e.g. "<<=".
2972 static StringRef getOpcodeStr(Opcode Op);
2974 StringRef getOpcodeStr() const { return getOpcodeStr(getOpcode()); }
2976 /// \brief Retrieve the binary opcode that corresponds to the given
2977 /// overloaded operator.
2978 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO);
2980 /// \brief Retrieve the overloaded operator kind that corresponds to
2981 /// the given binary opcode.
2982 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc);
2984 /// predicates to categorize the respective opcodes.
2985 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; }
2986 static bool isMultiplicativeOp(Opcode Opc) {
2987 return Opc >= BO_Mul && Opc <= BO_Rem;
2989 bool isMultiplicativeOp() const { return isMultiplicativeOp(getOpcode()); }
2990 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; }
2991 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); }
2992 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; }
2993 bool isShiftOp() const { return isShiftOp(getOpcode()); }
2995 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; }
2996 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); }
2998 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; }
2999 bool isRelationalOp() const { return isRelationalOp(getOpcode()); }
3001 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; }
3002 bool isEqualityOp() const { return isEqualityOp(getOpcode()); }
3004 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; }
3005 bool isComparisonOp() const { return isComparisonOp(getOpcode()); }
3007 static Opcode negateComparisonOp(Opcode Opc) {
3010 llvm_unreachable("Not a comparsion operator.");
3011 case BO_LT: return BO_GE;
3012 case BO_GT: return BO_LE;
3013 case BO_LE: return BO_GT;
3014 case BO_GE: return BO_LT;
3015 case BO_EQ: return BO_NE;
3016 case BO_NE: return BO_EQ;
3020 static Opcode reverseComparisonOp(Opcode Opc) {
3023 llvm_unreachable("Not a comparsion operator.");
3024 case BO_LT: return BO_GT;
3025 case BO_GT: return BO_LT;
3026 case BO_LE: return BO_GE;
3027 case BO_GE: return BO_LE;
3034 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; }
3035 bool isLogicalOp() const { return isLogicalOp(getOpcode()); }
3037 static bool isAssignmentOp(Opcode Opc) {
3038 return Opc >= BO_Assign && Opc <= BO_OrAssign;
3040 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); }
3042 static bool isCompoundAssignmentOp(Opcode Opc) {
3043 return Opc > BO_Assign && Opc <= BO_OrAssign;
3045 bool isCompoundAssignmentOp() const {
3046 return isCompoundAssignmentOp(getOpcode());
3048 static Opcode getOpForCompoundAssignment(Opcode Opc) {
3049 assert(isCompoundAssignmentOp(Opc));
3050 if (Opc >= BO_AndAssign)
3051 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And);
3053 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul);
3056 static bool isShiftAssignOp(Opcode Opc) {
3057 return Opc == BO_ShlAssign || Opc == BO_ShrAssign;
3059 bool isShiftAssignOp() const {
3060 return isShiftAssignOp(getOpcode());
3063 static bool classof(const Stmt *S) {
3064 return S->getStmtClass() >= firstBinaryOperatorConstant &&
3065 S->getStmtClass() <= lastBinaryOperatorConstant;
3069 child_range children() {
3070 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
3073 // Set the FP contractability status of this operator. Only meaningful for
3074 // operations on floating point types.
3075 void setFPContractable(bool FPC) { FPContractable = FPC; }
3077 // Get the FP contractability status of this operator. Only meaningful for
3078 // operations on floating point types.
3079 bool isFPContractable() const { return FPContractable; }
3082 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy,
3083 ExprValueKind VK, ExprObjectKind OK,
3084 SourceLocation opLoc, bool fpContractable, bool dead2)
3085 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK,
3086 lhs->isTypeDependent() || rhs->isTypeDependent(),
3087 lhs->isValueDependent() || rhs->isValueDependent(),
3088 (lhs->isInstantiationDependent() ||
3089 rhs->isInstantiationDependent()),
3090 (lhs->containsUnexpandedParameterPack() ||
3091 rhs->containsUnexpandedParameterPack())),
3092 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) {
3093 SubExprs[LHS] = lhs;
3094 SubExprs[RHS] = rhs;
3097 BinaryOperator(StmtClass SC, EmptyShell Empty)
3098 : Expr(SC, Empty), Opc(BO_MulAssign) { }
3101 /// CompoundAssignOperator - For compound assignments (e.g. +=), we keep
3102 /// track of the type the operation is performed in. Due to the semantics of
3103 /// these operators, the operands are promoted, the arithmetic performed, an
3104 /// implicit conversion back to the result type done, then the assignment takes
3105 /// place. This captures the intermediate type which the computation is done
3107 class CompoundAssignOperator : public BinaryOperator {
3108 QualType ComputationLHSType;
3109 QualType ComputationResultType;
3111 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType,
3112 ExprValueKind VK, ExprObjectKind OK,
3113 QualType CompLHSType, QualType CompResultType,
3114 SourceLocation OpLoc, bool fpContractable)
3115 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, fpContractable,
3117 ComputationLHSType(CompLHSType),
3118 ComputationResultType(CompResultType) {
3119 assert(isCompoundAssignmentOp() &&
3120 "Only should be used for compound assignments");
3123 /// \brief Build an empty compound assignment operator expression.
3124 explicit CompoundAssignOperator(EmptyShell Empty)
3125 : BinaryOperator(CompoundAssignOperatorClass, Empty) { }
3127 // The two computation types are the type the LHS is converted
3128 // to for the computation and the type of the result; the two are
3129 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr).
3130 QualType getComputationLHSType() const { return ComputationLHSType; }
3131 void setComputationLHSType(QualType T) { ComputationLHSType = T; }
3133 QualType getComputationResultType() const { return ComputationResultType; }
3134 void setComputationResultType(QualType T) { ComputationResultType = T; }
3136 static bool classof(const Stmt *S) {
3137 return S->getStmtClass() == CompoundAssignOperatorClass;
3141 /// AbstractConditionalOperator - An abstract base class for
3142 /// ConditionalOperator and BinaryConditionalOperator.
3143 class AbstractConditionalOperator : public Expr {
3144 SourceLocation QuestionLoc, ColonLoc;
3145 friend class ASTStmtReader;
3148 AbstractConditionalOperator(StmtClass SC, QualType T,
3149 ExprValueKind VK, ExprObjectKind OK,
3150 bool TD, bool VD, bool ID,
3151 bool ContainsUnexpandedParameterPack,
3152 SourceLocation qloc,
3153 SourceLocation cloc)
3154 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack),
3155 QuestionLoc(qloc), ColonLoc(cloc) {}
3157 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty)
3158 : Expr(SC, Empty) { }
3161 // getCond - Return the expression representing the condition for
3163 Expr *getCond() const;
3165 // getTrueExpr - Return the subexpression representing the value of
3166 // the expression if the condition evaluates to true.
3167 Expr *getTrueExpr() const;
3169 // getFalseExpr - Return the subexpression representing the value of
3170 // the expression if the condition evaluates to false. This is
3171 // the same as getRHS.
3172 Expr *getFalseExpr() const;
3174 SourceLocation getQuestionLoc() const { return QuestionLoc; }
3175 SourceLocation getColonLoc() const { return ColonLoc; }
3177 static bool classof(const Stmt *T) {
3178 return T->getStmtClass() == ConditionalOperatorClass ||
3179 T->getStmtClass() == BinaryConditionalOperatorClass;
3183 /// ConditionalOperator - The ?: ternary operator. The GNU "missing
3184 /// middle" extension is a BinaryConditionalOperator.
3185 class ConditionalOperator : public AbstractConditionalOperator {
3186 enum { COND, LHS, RHS, END_EXPR };
3187 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides.
3189 friend class ASTStmtReader;
3191 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs,
3192 SourceLocation CLoc, Expr *rhs,
3193 QualType t, ExprValueKind VK, ExprObjectKind OK)
3194 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK,
3195 // FIXME: the type of the conditional operator doesn't
3196 // depend on the type of the conditional, but the standard
3197 // seems to imply that it could. File a bug!
3198 (lhs->isTypeDependent() || rhs->isTypeDependent()),
3199 (cond->isValueDependent() || lhs->isValueDependent() ||
3200 rhs->isValueDependent()),
3201 (cond->isInstantiationDependent() ||
3202 lhs->isInstantiationDependent() ||
3203 rhs->isInstantiationDependent()),
3204 (cond->containsUnexpandedParameterPack() ||
3205 lhs->containsUnexpandedParameterPack() ||
3206 rhs->containsUnexpandedParameterPack()),
3208 SubExprs[COND] = cond;
3209 SubExprs[LHS] = lhs;
3210 SubExprs[RHS] = rhs;
3213 /// \brief Build an empty conditional operator.
3214 explicit ConditionalOperator(EmptyShell Empty)
3215 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { }
3217 // getCond - Return the expression representing the condition for
3219 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
3221 // getTrueExpr - Return the subexpression representing the value of
3222 // the expression if the condition evaluates to true.
3223 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); }
3225 // getFalseExpr - Return the subexpression representing the value of
3226 // the expression if the condition evaluates to false. This is
3227 // the same as getRHS.
3228 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); }
3230 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
3231 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
3233 SourceLocation getLocStart() const LLVM_READONLY {
3234 return getCond()->getLocStart();
3236 SourceLocation getLocEnd() const LLVM_READONLY {
3237 return getRHS()->getLocEnd();
3240 static bool classof(const Stmt *T) {
3241 return T->getStmtClass() == ConditionalOperatorClass;
3245 child_range children() {
3246 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
3250 /// BinaryConditionalOperator - The GNU extension to the conditional
3251 /// operator which allows the middle operand to be omitted.
3253 /// This is a different expression kind on the assumption that almost
3254 /// every client ends up needing to know that these are different.
3255 class BinaryConditionalOperator : public AbstractConditionalOperator {
3256 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS };
3258 /// - the common condition/left-hand-side expression, which will be
3259 /// evaluated as the opaque value
3260 /// - the condition, expressed in terms of the opaque value
3261 /// - the left-hand-side, expressed in terms of the opaque value
3262 /// - the right-hand-side
3263 Stmt *SubExprs[NUM_SUBEXPRS];
3264 OpaqueValueExpr *OpaqueValue;
3266 friend class ASTStmtReader;
3268 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue,
3269 Expr *cond, Expr *lhs, Expr *rhs,
3270 SourceLocation qloc, SourceLocation cloc,
3271 QualType t, ExprValueKind VK, ExprObjectKind OK)
3272 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK,
3273 (common->isTypeDependent() || rhs->isTypeDependent()),
3274 (common->isValueDependent() || rhs->isValueDependent()),
3275 (common->isInstantiationDependent() ||
3276 rhs->isInstantiationDependent()),
3277 (common->containsUnexpandedParameterPack() ||
3278 rhs->containsUnexpandedParameterPack()),
3280 OpaqueValue(opaqueValue) {
3281 SubExprs[COMMON] = common;
3282 SubExprs[COND] = cond;
3283 SubExprs[LHS] = lhs;
3284 SubExprs[RHS] = rhs;
3285 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value");
3288 /// \brief Build an empty conditional operator.
3289 explicit BinaryConditionalOperator(EmptyShell Empty)
3290 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { }
3292 /// \brief getCommon - Return the common expression, written to the
3293 /// left of the condition. The opaque value will be bound to the
3294 /// result of this expression.
3295 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); }
3297 /// \brief getOpaqueValue - Return the opaque value placeholder.
3298 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; }
3300 /// \brief getCond - Return the condition expression; this is defined
3301 /// in terms of the opaque value.
3302 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
3304 /// \brief getTrueExpr - Return the subexpression which will be
3305 /// evaluated if the condition evaluates to true; this is defined
3306 /// in terms of the opaque value.
3307 Expr *getTrueExpr() const {
3308 return cast<Expr>(SubExprs[LHS]);
3311 /// \brief getFalseExpr - Return the subexpression which will be
3312 /// evaluated if the condnition evaluates to false; this is
3313 /// defined in terms of the opaque value.
3314 Expr *getFalseExpr() const {
3315 return cast<Expr>(SubExprs[RHS]);
3318 SourceLocation getLocStart() const LLVM_READONLY {
3319 return getCommon()->getLocStart();
3321 SourceLocation getLocEnd() const LLVM_READONLY {
3322 return getFalseExpr()->getLocEnd();
3325 static bool classof(const Stmt *T) {
3326 return T->getStmtClass() == BinaryConditionalOperatorClass;
3330 child_range children() {
3331 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS);
3335 inline Expr *AbstractConditionalOperator::getCond() const {
3336 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
3337 return co->getCond();
3338 return cast<BinaryConditionalOperator>(this)->getCond();
3341 inline Expr *AbstractConditionalOperator::getTrueExpr() const {
3342 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
3343 return co->getTrueExpr();
3344 return cast<BinaryConditionalOperator>(this)->getTrueExpr();
3347 inline Expr *AbstractConditionalOperator::getFalseExpr() const {
3348 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
3349 return co->getFalseExpr();
3350 return cast<BinaryConditionalOperator>(this)->getFalseExpr();
3353 /// AddrLabelExpr - The GNU address of label extension, representing &&label.
3354 class AddrLabelExpr : public Expr {
3355 SourceLocation AmpAmpLoc, LabelLoc;
3358 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L,
3360 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false,
3362 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {}
3364 /// \brief Build an empty address of a label expression.
3365 explicit AddrLabelExpr(EmptyShell Empty)
3366 : Expr(AddrLabelExprClass, Empty) { }
3368 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; }
3369 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; }
3370 SourceLocation getLabelLoc() const { return LabelLoc; }
3371 void setLabelLoc(SourceLocation L) { LabelLoc = L; }
3373 SourceLocation getLocStart() const LLVM_READONLY { return AmpAmpLoc; }
3374 SourceLocation getLocEnd() const LLVM_READONLY { return LabelLoc; }
3376 LabelDecl *getLabel() const { return Label; }
3377 void setLabel(LabelDecl *L) { Label = L; }
3379 static bool classof(const Stmt *T) {
3380 return T->getStmtClass() == AddrLabelExprClass;
3384 child_range children() {
3385 return child_range(child_iterator(), child_iterator());
3389 /// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
3390 /// The StmtExpr contains a single CompoundStmt node, which it evaluates and
3391 /// takes the value of the last subexpression.
3393 /// A StmtExpr is always an r-value; values "returned" out of a
3394 /// StmtExpr will be copied.
3395 class StmtExpr : public Expr {
3397 SourceLocation LParenLoc, RParenLoc;
3399 // FIXME: Does type-dependence need to be computed differently?
3400 // FIXME: Do we need to compute instantiation instantiation-dependence for
3401 // statements? (ugh!)
3402 StmtExpr(CompoundStmt *substmt, QualType T,
3403 SourceLocation lp, SourceLocation rp) :
3404 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary,
3405 T->isDependentType(), false, false, false),
3406 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { }
3408 /// \brief Build an empty statement expression.
3409 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { }
3411 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); }
3412 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); }
3413 void setSubStmt(CompoundStmt *S) { SubStmt = S; }
3415 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; }
3416 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3418 SourceLocation getLParenLoc() const { return LParenLoc; }
3419 void setLParenLoc(SourceLocation L) { LParenLoc = L; }
3420 SourceLocation getRParenLoc() const { return RParenLoc; }
3421 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
3423 static bool classof(const Stmt *T) {
3424 return T->getStmtClass() == StmtExprClass;
3428 child_range children() { return child_range(&SubStmt, &SubStmt+1); }
3431 /// ShuffleVectorExpr - clang-specific builtin-in function
3432 /// __builtin_shufflevector.
3433 /// This AST node represents a operator that does a constant
3434 /// shuffle, similar to LLVM's shufflevector instruction. It takes
3435 /// two vectors and a variable number of constant indices,
3436 /// and returns the appropriately shuffled vector.
3437 class ShuffleVectorExpr : public Expr {
3438 SourceLocation BuiltinLoc, RParenLoc;
3440 // SubExprs - the list of values passed to the __builtin_shufflevector
3441 // function. The first two are vectors, and the rest are constant
3442 // indices. The number of values in this list is always
3443 // 2+the number of indices in the vector type.
3448 ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr*> args, QualType Type,
3449 SourceLocation BLoc, SourceLocation RP);
3451 /// \brief Build an empty vector-shuffle expression.
3452 explicit ShuffleVectorExpr(EmptyShell Empty)
3453 : Expr(ShuffleVectorExprClass, Empty), SubExprs(nullptr) { }
3455 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
3456 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }
3458 SourceLocation getRParenLoc() const { return RParenLoc; }
3459 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
3461 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
3462 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3464 static bool classof(const Stmt *T) {
3465 return T->getStmtClass() == ShuffleVectorExprClass;
3468 /// getNumSubExprs - Return the size of the SubExprs array. This includes the
3469 /// constant expression, the actual arguments passed in, and the function
3471 unsigned getNumSubExprs() const { return NumExprs; }
3473 /// \brief Retrieve the array of expressions.
3474 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); }
3476 /// getExpr - Return the Expr at the specified index.
3477 Expr *getExpr(unsigned Index) {
3478 assert((Index < NumExprs) && "Arg access out of range!");
3479 return cast<Expr>(SubExprs[Index]);
3481 const Expr *getExpr(unsigned Index) const {
3482 assert((Index < NumExprs) && "Arg access out of range!");
3483 return cast<Expr>(SubExprs[Index]);
3486 void setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs);
3488 llvm::APSInt getShuffleMaskIdx(const ASTContext &Ctx, unsigned N) const {
3489 assert((N < NumExprs - 2) && "Shuffle idx out of range!");
3490 return getExpr(N+2)->EvaluateKnownConstInt(Ctx);
3494 child_range children() {
3495 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs);
3499 /// ConvertVectorExpr - Clang builtin function __builtin_convertvector
3500 /// This AST node provides support for converting a vector type to another
3501 /// vector type of the same arity.
3502 class ConvertVectorExpr : public Expr {
3505 TypeSourceInfo *TInfo;
3506 SourceLocation BuiltinLoc, RParenLoc;
3508 friend class ASTReader;
3509 friend class ASTStmtReader;
3510 explicit ConvertVectorExpr(EmptyShell Empty) : Expr(ConvertVectorExprClass, Empty) {}
3513 ConvertVectorExpr(Expr* SrcExpr, TypeSourceInfo *TI, QualType DstType,
3514 ExprValueKind VK, ExprObjectKind OK,
3515 SourceLocation BuiltinLoc, SourceLocation RParenLoc)
3516 : Expr(ConvertVectorExprClass, DstType, VK, OK,
3517 DstType->isDependentType(),
3518 DstType->isDependentType() || SrcExpr->isValueDependent(),
3519 (DstType->isInstantiationDependentType() ||
3520 SrcExpr->isInstantiationDependent()),
3521 (DstType->containsUnexpandedParameterPack() ||
3522 SrcExpr->containsUnexpandedParameterPack())),
3523 SrcExpr(SrcExpr), TInfo(TI), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {}
3525 /// getSrcExpr - Return the Expr to be converted.
3526 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); }
3528 /// getTypeSourceInfo - Return the destination type.
3529 TypeSourceInfo *getTypeSourceInfo() const {
3532 void setTypeSourceInfo(TypeSourceInfo *ti) {
3536 /// getBuiltinLoc - Return the location of the __builtin_convertvector token.
3537 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
3539 /// getRParenLoc - Return the location of final right parenthesis.
3540 SourceLocation getRParenLoc() const { return RParenLoc; }
3542 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
3543 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3545 static bool classof(const Stmt *T) {
3546 return T->getStmtClass() == ConvertVectorExprClass;
3550 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); }
3553 /// ChooseExpr - GNU builtin-in function __builtin_choose_expr.
3554 /// This AST node is similar to the conditional operator (?:) in C, with
3555 /// the following exceptions:
3556 /// - the test expression must be a integer constant expression.
3557 /// - the expression returned acts like the chosen subexpression in every
3558 /// visible way: the type is the same as that of the chosen subexpression,
3559 /// and all predicates (whether it's an l-value, whether it's an integer
3560 /// constant expression, etc.) return the same result as for the chosen
3562 class ChooseExpr : public Expr {
3563 enum { COND, LHS, RHS, END_EXPR };
3564 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides.
3565 SourceLocation BuiltinLoc, RParenLoc;
3568 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs,
3569 QualType t, ExprValueKind VK, ExprObjectKind OK,
3570 SourceLocation RP, bool condIsTrue,
3571 bool TypeDependent, bool ValueDependent)
3572 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent,
3573 (cond->isInstantiationDependent() ||
3574 lhs->isInstantiationDependent() ||
3575 rhs->isInstantiationDependent()),
3576 (cond->containsUnexpandedParameterPack() ||
3577 lhs->containsUnexpandedParameterPack() ||
3578 rhs->containsUnexpandedParameterPack())),
3579 BuiltinLoc(BLoc), RParenLoc(RP), CondIsTrue(condIsTrue) {
3580 SubExprs[COND] = cond;
3581 SubExprs[LHS] = lhs;
3582 SubExprs[RHS] = rhs;
3585 /// \brief Build an empty __builtin_choose_expr.
3586 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { }
3588 /// isConditionTrue - Return whether the condition is true (i.e. not
3590 bool isConditionTrue() const {
3591 assert(!isConditionDependent() &&
3592 "Dependent condition isn't true or false");
3595 void setIsConditionTrue(bool isTrue) { CondIsTrue = isTrue; }
3597 bool isConditionDependent() const {
3598 return getCond()->isTypeDependent() || getCond()->isValueDependent();
3601 /// getChosenSubExpr - Return the subexpression chosen according to the
3603 Expr *getChosenSubExpr() const {
3604 return isConditionTrue() ? getLHS() : getRHS();
3607 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
3608 void setCond(Expr *E) { SubExprs[COND] = E; }
3609 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
3610 void setLHS(Expr *E) { SubExprs[LHS] = E; }
3611 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
3612 void setRHS(Expr *E) { SubExprs[RHS] = E; }
3614 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
3615 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }
3617 SourceLocation getRParenLoc() const { return RParenLoc; }
3618 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
3620 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
3621 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3623 static bool classof(const Stmt *T) {
3624 return T->getStmtClass() == ChooseExprClass;
3628 child_range children() {
3629 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
3633 /// GNUNullExpr - Implements the GNU __null extension, which is a name
3634 /// for a null pointer constant that has integral type (e.g., int or
3635 /// long) and is the same size and alignment as a pointer. The __null
3636 /// extension is typically only used by system headers, which define
3637 /// NULL as __null in C++ rather than using 0 (which is an integer
3638 /// that may not match the size of a pointer).
3639 class GNUNullExpr : public Expr {
3640 /// TokenLoc - The location of the __null keyword.
3641 SourceLocation TokenLoc;
3644 GNUNullExpr(QualType Ty, SourceLocation Loc)
3645 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false,
3649 /// \brief Build an empty GNU __null expression.
3650 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { }
3652 /// getTokenLocation - The location of the __null token.
3653 SourceLocation getTokenLocation() const { return TokenLoc; }
3654 void setTokenLocation(SourceLocation L) { TokenLoc = L; }
3656 SourceLocation getLocStart() const LLVM_READONLY { return TokenLoc; }
3657 SourceLocation getLocEnd() const LLVM_READONLY { return TokenLoc; }
3659 static bool classof(const Stmt *T) {
3660 return T->getStmtClass() == GNUNullExprClass;
3664 child_range children() {
3665 return child_range(child_iterator(), child_iterator());
3669 /// Represents a call to the builtin function \c __builtin_va_arg.
3670 class VAArgExpr : public Expr {
3672 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfo;
3673 SourceLocation BuiltinLoc, RParenLoc;
3675 VAArgExpr(SourceLocation BLoc, Expr *e, TypeSourceInfo *TInfo,
3676 SourceLocation RPLoc, QualType t, bool IsMS)
3677 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, t->isDependentType(),
3678 false, (TInfo->getType()->isInstantiationDependentType() ||
3679 e->isInstantiationDependent()),
3680 (TInfo->getType()->containsUnexpandedParameterPack() ||
3681 e->containsUnexpandedParameterPack())),
3682 Val(e), TInfo(TInfo, IsMS), BuiltinLoc(BLoc), RParenLoc(RPLoc) {}
3684 /// Create an empty __builtin_va_arg expression.
3685 explicit VAArgExpr(EmptyShell Empty)
3686 : Expr(VAArgExprClass, Empty), Val(nullptr), TInfo(nullptr, false) {}
3688 const Expr *getSubExpr() const { return cast<Expr>(Val); }
3689 Expr *getSubExpr() { return cast<Expr>(Val); }
3690 void setSubExpr(Expr *E) { Val = E; }
3692 /// Returns whether this is really a Win64 ABI va_arg expression.
3693 bool isMicrosoftABI() const { return TInfo.getInt(); }
3694 void setIsMicrosoftABI(bool IsMS) { TInfo.setInt(IsMS); }
3696 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo.getPointer(); }
3697 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo.setPointer(TI); }
3699 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
3700 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }
3702 SourceLocation getRParenLoc() const { return RParenLoc; }
3703 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
3705 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
3706 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3708 static bool classof(const Stmt *T) {
3709 return T->getStmtClass() == VAArgExprClass;
3713 child_range children() { return child_range(&Val, &Val+1); }
3716 /// @brief Describes an C or C++ initializer list.
3718 /// InitListExpr describes an initializer list, which can be used to
3719 /// initialize objects of different types, including
3720 /// struct/class/union types, arrays, and vectors. For example:
3723 /// struct foo x = { 1, { 2, 3 } };
3726 /// Prior to semantic analysis, an initializer list will represent the
3727 /// initializer list as written by the user, but will have the
3728 /// placeholder type "void". This initializer list is called the
3729 /// syntactic form of the initializer, and may contain C99 designated
3730 /// initializers (represented as DesignatedInitExprs), initializations
3731 /// of subobject members without explicit braces, and so on. Clients
3732 /// interested in the original syntax of the initializer list should
3733 /// use the syntactic form of the initializer list.
3735 /// After semantic analysis, the initializer list will represent the
3736 /// semantic form of the initializer, where the initializations of all
3737 /// subobjects are made explicit with nested InitListExpr nodes and
3738 /// C99 designators have been eliminated by placing the designated
3739 /// initializations into the subobject they initialize. Additionally,
3740 /// any "holes" in the initialization, where no initializer has been
3741 /// specified for a particular subobject, will be replaced with
3742 /// implicitly-generated ImplicitValueInitExpr expressions that
3743 /// value-initialize the subobjects. Note, however, that the
3744 /// initializer lists may still have fewer initializers than there are
3745 /// elements to initialize within the object.
3747 /// After semantic analysis has completed, given an initializer list,
3748 /// method isSemanticForm() returns true if and only if this is the
3749 /// semantic form of the initializer list (note: the same AST node
3750 /// may at the same time be the syntactic form).
3751 /// Given the semantic form of the initializer list, one can retrieve
3752 /// the syntactic form of that initializer list (when different)
3753 /// using method getSyntacticForm(); the method returns null if applied
3754 /// to a initializer list which is already in syntactic form.
3755 /// Similarly, given the syntactic form (i.e., an initializer list such
3756 /// that isSemanticForm() returns false), one can retrieve the semantic
3757 /// form using method getSemanticForm().
3758 /// Since many initializer lists have the same syntactic and semantic forms,
3759 /// getSyntacticForm() may return NULL, indicating that the current
3760 /// semantic initializer list also serves as its syntactic form.
3761 class InitListExpr : public Expr {
3762 // FIXME: Eliminate this vector in favor of ASTContext allocation
3763 typedef ASTVector<Stmt *> InitExprsTy;
3764 InitExprsTy InitExprs;
3765 SourceLocation LBraceLoc, RBraceLoc;
3767 /// The alternative form of the initializer list (if it exists).
3768 /// The int part of the pair stores whether this initializer list is
3769 /// in semantic form. If not null, the pointer points to:
3770 /// - the syntactic form, if this is in semantic form;
3771 /// - the semantic form, if this is in syntactic form.
3772 llvm::PointerIntPair<InitListExpr *, 1, bool> AltForm;
3775 /// If this initializer list initializes an array with more elements than
3776 /// there are initializers in the list, specifies an expression to be used
3777 /// for value initialization of the rest of the elements.
3779 /// If this initializer list initializes a union, specifies which
3780 /// field within the union will be initialized.
3781 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit;
3784 InitListExpr(const ASTContext &C, SourceLocation lbraceloc,
3785 ArrayRef<Expr*> initExprs, SourceLocation rbraceloc);
3787 /// \brief Build an empty initializer list.
3788 explicit InitListExpr(EmptyShell Empty)
3789 : Expr(InitListExprClass, Empty), AltForm(nullptr, true) { }
3791 unsigned getNumInits() const { return InitExprs.size(); }
3793 /// \brief Retrieve the set of initializers.
3794 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); }
3796 /// \brief Retrieve the set of initializers.
3797 Expr * const *getInits() const {
3798 return reinterpret_cast<Expr * const *>(InitExprs.data());
3801 ArrayRef<Expr *> inits() {
3802 return llvm::makeArrayRef(getInits(), getNumInits());
3805 ArrayRef<Expr *> inits() const {
3806 return llvm::makeArrayRef(getInits(), getNumInits());
3809 const Expr *getInit(unsigned Init) const {
3810 assert(Init < getNumInits() && "Initializer access out of range!");
3811 return cast_or_null<Expr>(InitExprs[Init]);
3814 Expr *getInit(unsigned Init) {
3815 assert(Init < getNumInits() && "Initializer access out of range!");
3816 return cast_or_null<Expr>(InitExprs[Init]);
3819 void setInit(unsigned Init, Expr *expr) {
3820 assert(Init < getNumInits() && "Initializer access out of range!");
3821 InitExprs[Init] = expr;
3824 ExprBits.TypeDependent |= expr->isTypeDependent();
3825 ExprBits.ValueDependent |= expr->isValueDependent();
3826 ExprBits.InstantiationDependent |= expr->isInstantiationDependent();
3827 ExprBits.ContainsUnexpandedParameterPack |=
3828 expr->containsUnexpandedParameterPack();
3832 /// \brief Reserve space for some number of initializers.
3833 void reserveInits(const ASTContext &C, unsigned NumInits);
3835 /// @brief Specify the number of initializers
3837 /// If there are more than @p NumInits initializers, the remaining
3838 /// initializers will be destroyed. If there are fewer than @p
3839 /// NumInits initializers, NULL expressions will be added for the
3840 /// unknown initializers.
3841 void resizeInits(const ASTContext &Context, unsigned NumInits);
3843 /// @brief Updates the initializer at index @p Init with the new
3844 /// expression @p expr, and returns the old expression at that
3847 /// When @p Init is out of range for this initializer list, the
3848 /// initializer list will be extended with NULL expressions to
3849 /// accommodate the new entry.
3850 Expr *updateInit(const ASTContext &C, unsigned Init, Expr *expr);
3852 /// \brief If this initializer list initializes an array with more elements
3853 /// than there are initializers in the list, specifies an expression to be
3854 /// used for value initialization of the rest of the elements.
3855 Expr *getArrayFiller() {
3856 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>();
3858 const Expr *getArrayFiller() const {
3859 return const_cast<InitListExpr *>(this)->getArrayFiller();
3861 void setArrayFiller(Expr *filler);
3863 /// \brief Return true if this is an array initializer and its array "filler"
3865 bool hasArrayFiller() const { return getArrayFiller(); }
3867 /// \brief If this initializes a union, specifies which field in the
3868 /// union to initialize.
3870 /// Typically, this field is the first named field within the
3871 /// union. However, a designated initializer can specify the
3872 /// initialization of a different field within the union.
3873 FieldDecl *getInitializedFieldInUnion() {
3874 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>();
3876 const FieldDecl *getInitializedFieldInUnion() const {
3877 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion();
3879 void setInitializedFieldInUnion(FieldDecl *FD) {
3880 assert((FD == nullptr
3881 || getInitializedFieldInUnion() == nullptr
3882 || getInitializedFieldInUnion() == FD)
3883 && "Only one field of a union may be initialized at a time!");
3884 ArrayFillerOrUnionFieldInit = FD;
3887 // Explicit InitListExpr's originate from source code (and have valid source
3888 // locations). Implicit InitListExpr's are created by the semantic analyzer.
3889 bool isExplicit() const {
3890 return LBraceLoc.isValid() && RBraceLoc.isValid();
3893 // Is this an initializer for an array of characters, initialized by a string
3894 // literal or an @encode?
3895 bool isStringLiteralInit() const;
3897 /// Is this a transparent initializer list (that is, an InitListExpr that is
3898 /// purely syntactic, and whose semantics are that of the sole contained
3900 bool isTransparent() const;
3902 SourceLocation getLBraceLoc() const { return LBraceLoc; }
3903 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; }
3904 SourceLocation getRBraceLoc() const { return RBraceLoc; }
3905 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; }
3907 bool isSemanticForm() const { return AltForm.getInt(); }
3908 InitListExpr *getSemanticForm() const {
3909 return isSemanticForm() ? nullptr : AltForm.getPointer();
3911 InitListExpr *getSyntacticForm() const {
3912 return isSemanticForm() ? AltForm.getPointer() : nullptr;
3915 void setSyntacticForm(InitListExpr *Init) {
3916 AltForm.setPointer(Init);
3917 AltForm.setInt(true);
3918 Init->AltForm.setPointer(this);
3919 Init->AltForm.setInt(false);
3922 bool hadArrayRangeDesignator() const {
3923 return InitListExprBits.HadArrayRangeDesignator != 0;
3925 void sawArrayRangeDesignator(bool ARD = true) {
3926 InitListExprBits.HadArrayRangeDesignator = ARD;
3929 SourceLocation getLocStart() const LLVM_READONLY;
3930 SourceLocation getLocEnd() const LLVM_READONLY;
3932 static bool classof(const Stmt *T) {
3933 return T->getStmtClass() == InitListExprClass;
3937 child_range children() {
3938 // FIXME: This does not include the array filler expression.
3939 if (InitExprs.empty())
3940 return child_range(child_iterator(), child_iterator());
3941 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size());
3944 typedef InitExprsTy::iterator iterator;
3945 typedef InitExprsTy::const_iterator const_iterator;
3946 typedef InitExprsTy::reverse_iterator reverse_iterator;
3947 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator;
3949 iterator begin() { return InitExprs.begin(); }
3950 const_iterator begin() const { return InitExprs.begin(); }
3951 iterator end() { return InitExprs.end(); }
3952 const_iterator end() const { return InitExprs.end(); }
3953 reverse_iterator rbegin() { return InitExprs.rbegin(); }
3954 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); }
3955 reverse_iterator rend() { return InitExprs.rend(); }
3956 const_reverse_iterator rend() const { return InitExprs.rend(); }
3958 friend class ASTStmtReader;
3959 friend class ASTStmtWriter;
3962 /// @brief Represents a C99 designated initializer expression.
3964 /// A designated initializer expression (C99 6.7.8) contains one or
3965 /// more designators (which can be field designators, array
3966 /// designators, or GNU array-range designators) followed by an
3967 /// expression that initializes the field or element(s) that the
3968 /// designators refer to. For example, given:
3975 /// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 };
3978 /// The InitListExpr contains three DesignatedInitExprs, the first of
3979 /// which covers @c [2].y=1.0. This DesignatedInitExpr will have two
3980 /// designators, one array designator for @c [2] followed by one field
3981 /// designator for @c .y. The initialization expression will be 1.0.
3982 class DesignatedInitExpr final
3984 private llvm::TrailingObjects<DesignatedInitExpr, Stmt *> {
3986 /// \brief Forward declaration of the Designator class.
3990 /// The location of the '=' or ':' prior to the actual initializer
3992 SourceLocation EqualOrColonLoc;
3994 /// Whether this designated initializer used the GNU deprecated
3995 /// syntax rather than the C99 '=' syntax.
3996 unsigned GNUSyntax : 1;
3998 /// The number of designators in this initializer expression.
3999 unsigned NumDesignators : 15;
4001 /// The number of subexpressions of this initializer expression,
4002 /// which contains both the initializer and any additional
4003 /// expressions used by array and array-range designators.
4004 unsigned NumSubExprs : 16;
4006 /// \brief The designators in this designated initialization
4008 Designator *Designators;
4010 DesignatedInitExpr(const ASTContext &C, QualType Ty,
4011 llvm::ArrayRef<Designator> Designators,
4012 SourceLocation EqualOrColonLoc, bool GNUSyntax,
4013 ArrayRef<Expr *> IndexExprs, Expr *Init);
4015 explicit DesignatedInitExpr(unsigned NumSubExprs)
4016 : Expr(DesignatedInitExprClass, EmptyShell()),
4017 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(nullptr) { }
4020 /// A field designator, e.g., ".x".
4021 struct FieldDesignator {
4022 /// Refers to the field that is being initialized. The low bit
4023 /// of this field determines whether this is actually a pointer
4024 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When
4025 /// initially constructed, a field designator will store an
4026 /// IdentifierInfo*. After semantic analysis has resolved that
4027 /// name, the field designator will instead store a FieldDecl*.
4028 uintptr_t NameOrField;
4030 /// The location of the '.' in the designated initializer.
4033 /// The location of the field name in the designated initializer.
4037 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]".
4038 struct ArrayOrRangeDesignator {
4039 /// Location of the first index expression within the designated
4040 /// initializer expression's list of subexpressions.
4042 /// The location of the '[' starting the array range designator.
4043 unsigned LBracketLoc;
4044 /// The location of the ellipsis separating the start and end
4045 /// indices. Only valid for GNU array-range designators.
4046 unsigned EllipsisLoc;
4047 /// The location of the ']' terminating the array range designator.
4048 unsigned RBracketLoc;
4051 /// @brief Represents a single C99 designator.
4053 /// @todo This class is infuriatingly similar to clang::Designator,
4054 /// but minor differences (storing indices vs. storing pointers)
4055 /// keep us from reusing it. Try harder, later, to rectify these
4058 /// @brief The kind of designator this describes.
4062 ArrayRangeDesignator
4066 /// A field designator, e.g., ".x".
4067 struct FieldDesignator Field;
4068 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]".
4069 struct ArrayOrRangeDesignator ArrayOrRange;
4071 friend class DesignatedInitExpr;
4076 /// @brief Initializes a field designator.
4077 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc,
4078 SourceLocation FieldLoc)
4079 : Kind(FieldDesignator) {
4080 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01;
4081 Field.DotLoc = DotLoc.getRawEncoding();
4082 Field.FieldLoc = FieldLoc.getRawEncoding();
4085 /// @brief Initializes an array designator.
4086 Designator(unsigned Index, SourceLocation LBracketLoc,
4087 SourceLocation RBracketLoc)
4088 : Kind(ArrayDesignator) {
4089 ArrayOrRange.Index = Index;
4090 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding();
4091 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding();
4092 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding();
4095 /// @brief Initializes a GNU array-range designator.
4096 Designator(unsigned Index, SourceLocation LBracketLoc,
4097 SourceLocation EllipsisLoc, SourceLocation RBracketLoc)
4098 : Kind(ArrayRangeDesignator) {
4099 ArrayOrRange.Index = Index;
4100 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding();
4101 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding();
4102 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding();
4105 bool isFieldDesignator() const { return Kind == FieldDesignator; }
4106 bool isArrayDesignator() const { return Kind == ArrayDesignator; }
4107 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; }
4109 IdentifierInfo *getFieldName() const;
4111 FieldDecl *getField() const {
4112 assert(Kind == FieldDesignator && "Only valid on a field designator");
4113 if (Field.NameOrField & 0x01)
4116 return reinterpret_cast<FieldDecl *>(Field.NameOrField);
4119 void setField(FieldDecl *FD) {
4120 assert(Kind == FieldDesignator && "Only valid on a field designator");
4121 Field.NameOrField = reinterpret_cast<uintptr_t>(FD);
4124 SourceLocation getDotLoc() const {
4125 assert(Kind == FieldDesignator && "Only valid on a field designator");
4126 return SourceLocation::getFromRawEncoding(Field.DotLoc);
4129 SourceLocation getFieldLoc() const {
4130 assert(Kind == FieldDesignator && "Only valid on a field designator");
4131 return SourceLocation::getFromRawEncoding(Field.FieldLoc);
4134 SourceLocation getLBracketLoc() const {
4135 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
4136 "Only valid on an array or array-range designator");
4137 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc);
4140 SourceLocation getRBracketLoc() const {
4141 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
4142 "Only valid on an array or array-range designator");
4143 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc);
4146 SourceLocation getEllipsisLoc() const {
4147 assert(Kind == ArrayRangeDesignator &&
4148 "Only valid on an array-range designator");
4149 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc);
4152 unsigned getFirstExprIndex() const {
4153 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
4154 "Only valid on an array or array-range designator");
4155 return ArrayOrRange.Index;
4158 SourceLocation getLocStart() const LLVM_READONLY {
4159 if (Kind == FieldDesignator)
4160 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc();
4162 return getLBracketLoc();
4164 SourceLocation getLocEnd() const LLVM_READONLY {
4165 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc();
4167 SourceRange getSourceRange() const LLVM_READONLY {
4168 return SourceRange(getLocStart(), getLocEnd());
4172 static DesignatedInitExpr *Create(const ASTContext &C,
4173 llvm::ArrayRef<Designator> Designators,
4174 ArrayRef<Expr*> IndexExprs,
4175 SourceLocation EqualOrColonLoc,
4176 bool GNUSyntax, Expr *Init);
4178 static DesignatedInitExpr *CreateEmpty(const ASTContext &C,
4179 unsigned NumIndexExprs);
4181 /// @brief Returns the number of designators in this initializer.
4182 unsigned size() const { return NumDesignators; }
4184 // Iterator access to the designators.
4185 llvm::MutableArrayRef<Designator> designators() {
4186 return {Designators, NumDesignators};
4189 llvm::ArrayRef<Designator> designators() const {
4190 return {Designators, NumDesignators};
4193 Designator *getDesignator(unsigned Idx) { return &designators()[Idx]; }
4195 void setDesignators(const ASTContext &C, const Designator *Desigs,
4196 unsigned NumDesigs);
4198 Expr *getArrayIndex(const Designator &D) const;
4199 Expr *getArrayRangeStart(const Designator &D) const;
4200 Expr *getArrayRangeEnd(const Designator &D) const;
4202 /// @brief Retrieve the location of the '=' that precedes the
4203 /// initializer value itself, if present.
4204 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; }
4205 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; }
4207 /// @brief Determines whether this designated initializer used the
4208 /// deprecated GNU syntax for designated initializers.
4209 bool usesGNUSyntax() const { return GNUSyntax; }
4210 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; }
4212 /// @brief Retrieve the initializer value.
4213 Expr *getInit() const {
4214 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin());
4217 void setInit(Expr *init) {
4218 *child_begin() = init;
4221 /// \brief Retrieve the total number of subexpressions in this
4222 /// designated initializer expression, including the actual
4223 /// initialized value and any expressions that occur within array
4224 /// and array-range designators.
4225 unsigned getNumSubExprs() const { return NumSubExprs; }
4227 Expr *getSubExpr(unsigned Idx) const {
4228 assert(Idx < NumSubExprs && "Subscript out of range");
4229 return cast<Expr>(getTrailingObjects<Stmt *>()[Idx]);
4232 void setSubExpr(unsigned Idx, Expr *E) {
4233 assert(Idx < NumSubExprs && "Subscript out of range");
4234 getTrailingObjects<Stmt *>()[Idx] = E;
4237 /// \brief Replaces the designator at index @p Idx with the series
4238 /// of designators in [First, Last).
4239 void ExpandDesignator(const ASTContext &C, unsigned Idx,
4240 const Designator *First, const Designator *Last);
4242 SourceRange getDesignatorsSourceRange() const;
4244 SourceLocation getLocStart() const LLVM_READONLY;
4245 SourceLocation getLocEnd() const LLVM_READONLY;
4247 static bool classof(const Stmt *T) {
4248 return T->getStmtClass() == DesignatedInitExprClass;
4252 child_range children() {
4253 Stmt **begin = getTrailingObjects<Stmt *>();
4254 return child_range(begin, begin + NumSubExprs);
4257 friend TrailingObjects;
4260 /// \brief Represents a place-holder for an object not to be initialized by
4263 /// This only makes sense when it appears as part of an updater of a
4264 /// DesignatedInitUpdateExpr (see below). The base expression of a DIUE
4265 /// initializes a big object, and the NoInitExpr's mark the spots within the
4266 /// big object not to be overwritten by the updater.
4268 /// \see DesignatedInitUpdateExpr
4269 class NoInitExpr : public Expr {
4271 explicit NoInitExpr(QualType ty)
4272 : Expr(NoInitExprClass, ty, VK_RValue, OK_Ordinary,
4273 false, false, ty->isInstantiationDependentType(), false) { }
4275 explicit NoInitExpr(EmptyShell Empty)
4276 : Expr(NoInitExprClass, Empty) { }
4278 static bool classof(const Stmt *T) {
4279 return T->getStmtClass() == NoInitExprClass;
4282 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); }
4283 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); }
4286 child_range children() {
4287 return child_range(child_iterator(), child_iterator());
4292 // struct Q { int a, b, c; };
4295 // struct A { Q q; } a = { *getQ(), .q.b = 3 };
4298 // We will have an InitListExpr for a, with type A, and then a
4299 // DesignatedInitUpdateExpr for "a.q" with type Q. The "base" for this DIUE
4300 // is the call expression *getQ(); the "updater" for the DIUE is ".q.b = 3"
4302 class DesignatedInitUpdateExpr : public Expr {
4303 // BaseAndUpdaterExprs[0] is the base expression;
4304 // BaseAndUpdaterExprs[1] is an InitListExpr overwriting part of the base.
4305 Stmt *BaseAndUpdaterExprs[2];
4308 DesignatedInitUpdateExpr(const ASTContext &C, SourceLocation lBraceLoc,
4309 Expr *baseExprs, SourceLocation rBraceLoc);
4311 explicit DesignatedInitUpdateExpr(EmptyShell Empty)
4312 : Expr(DesignatedInitUpdateExprClass, Empty) { }
4314 SourceLocation getLocStart() const LLVM_READONLY;
4315 SourceLocation getLocEnd() const LLVM_READONLY;
4317 static bool classof(const Stmt *T) {
4318 return T->getStmtClass() == DesignatedInitUpdateExprClass;
4321 Expr *getBase() const { return cast<Expr>(BaseAndUpdaterExprs[0]); }
4322 void setBase(Expr *Base) { BaseAndUpdaterExprs[0] = Base; }
4324 InitListExpr *getUpdater() const {
4325 return cast<InitListExpr>(BaseAndUpdaterExprs[1]);
4327 void setUpdater(Expr *Updater) { BaseAndUpdaterExprs[1] = Updater; }
4330 // children = the base and the updater
4331 child_range children() {
4332 return child_range(&BaseAndUpdaterExprs[0], &BaseAndUpdaterExprs[0] + 2);
4336 /// \brief Represents a loop initializing the elements of an array.
4338 /// The need to initialize the elements of an array occurs in a number of
4341 /// * in the implicit copy/move constructor for a class with an array member
4342 /// * when a lambda-expression captures an array by value
4343 /// * when a decomposition declaration decomposes an array
4345 /// There are two subexpressions: a common expression (the source array)
4346 /// that is evaluated once up-front, and a per-element initializer that
4347 /// runs once for each array element.
4349 /// Within the per-element initializer, the common expression may be referenced
4350 /// via an OpaqueValueExpr, and the current index may be obtained via an
4351 /// ArrayInitIndexExpr.
4352 class ArrayInitLoopExpr : public Expr {
4355 explicit ArrayInitLoopExpr(EmptyShell Empty)
4356 : Expr(ArrayInitLoopExprClass, Empty), SubExprs{} {}
4359 explicit ArrayInitLoopExpr(QualType T, Expr *CommonInit, Expr *ElementInit)
4360 : Expr(ArrayInitLoopExprClass, T, VK_RValue, OK_Ordinary, false,
4361 CommonInit->isValueDependent() || ElementInit->isValueDependent(),
4362 T->isInstantiationDependentType(),
4363 CommonInit->containsUnexpandedParameterPack() ||
4364 ElementInit->containsUnexpandedParameterPack()),
4365 SubExprs{CommonInit, ElementInit} {}
4367 /// Get the common subexpression shared by all initializations (the source
4369 OpaqueValueExpr *getCommonExpr() const {
4370 return cast<OpaqueValueExpr>(SubExprs[0]);
4373 /// Get the initializer to use for each array element.
4374 Expr *getSubExpr() const { return cast<Expr>(SubExprs[1]); }
4376 llvm::APInt getArraySize() const {
4377 return cast<ConstantArrayType>(getType()->castAsArrayTypeUnsafe())
4381 static bool classof(const Stmt *S) {
4382 return S->getStmtClass() == ArrayInitLoopExprClass;
4385 SourceLocation getLocStart() const LLVM_READONLY {
4386 return getCommonExpr()->getLocStart();
4388 SourceLocation getLocEnd() const LLVM_READONLY {
4389 return getCommonExpr()->getLocEnd();
4392 child_range children() {
4393 return child_range(SubExprs, SubExprs + 2);
4396 friend class ASTReader;
4397 friend class ASTStmtReader;
4398 friend class ASTStmtWriter;
4401 /// \brief Represents the index of the current element of an array being
4402 /// initialized by an ArrayInitLoopExpr. This can only appear within the
4403 /// subexpression of an ArrayInitLoopExpr.
4404 class ArrayInitIndexExpr : public Expr {
4405 explicit ArrayInitIndexExpr(EmptyShell Empty)
4406 : Expr(ArrayInitIndexExprClass, Empty) {}
4409 explicit ArrayInitIndexExpr(QualType T)
4410 : Expr(ArrayInitIndexExprClass, T, VK_RValue, OK_Ordinary,
4411 false, false, false, false) {}
4413 static bool classof(const Stmt *S) {
4414 return S->getStmtClass() == ArrayInitIndexExprClass;
4417 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); }
4418 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); }
4420 child_range children() {
4421 return child_range(child_iterator(), child_iterator());
4424 friend class ASTReader;
4425 friend class ASTStmtReader;
4428 /// \brief Represents an implicitly-generated value initialization of
4429 /// an object of a given type.
4431 /// Implicit value initializations occur within semantic initializer
4432 /// list expressions (InitListExpr) as placeholders for subobject
4433 /// initializations not explicitly specified by the user.
4435 /// \see InitListExpr
4436 class ImplicitValueInitExpr : public Expr {
4438 explicit ImplicitValueInitExpr(QualType ty)
4439 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary,
4440 false, false, ty->isInstantiationDependentType(), false) { }
4442 /// \brief Construct an empty implicit value initialization.
4443 explicit ImplicitValueInitExpr(EmptyShell Empty)
4444 : Expr(ImplicitValueInitExprClass, Empty) { }
4446 static bool classof(const Stmt *T) {
4447 return T->getStmtClass() == ImplicitValueInitExprClass;
4450 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); }
4451 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); }
4454 child_range children() {
4455 return child_range(child_iterator(), child_iterator());
4459 class ParenListExpr : public Expr {
4462 SourceLocation LParenLoc, RParenLoc;
4465 ParenListExpr(const ASTContext& C, SourceLocation lparenloc,
4466 ArrayRef<Expr*> exprs, SourceLocation rparenloc);
4468 /// \brief Build an empty paren list.
4469 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { }
4471 unsigned getNumExprs() const { return NumExprs; }
4473 const Expr* getExpr(unsigned Init) const {
4474 assert(Init < getNumExprs() && "Initializer access out of range!");
4475 return cast_or_null<Expr>(Exprs[Init]);
4478 Expr* getExpr(unsigned Init) {
4479 assert(Init < getNumExprs() && "Initializer access out of range!");
4480 return cast_or_null<Expr>(Exprs[Init]);
4483 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); }
4485 ArrayRef<Expr *> exprs() {
4486 return llvm::makeArrayRef(getExprs(), getNumExprs());
4489 SourceLocation getLParenLoc() const { return LParenLoc; }
4490 SourceLocation getRParenLoc() const { return RParenLoc; }
4492 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; }
4493 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
4495 static bool classof(const Stmt *T) {
4496 return T->getStmtClass() == ParenListExprClass;
4500 child_range children() {
4501 return child_range(&Exprs[0], &Exprs[0]+NumExprs);
4504 friend class ASTStmtReader;
4505 friend class ASTStmtWriter;
4508 /// \brief Represents a C11 generic selection.
4510 /// A generic selection (C11 6.5.1.1) contains an unevaluated controlling
4511 /// expression, followed by one or more generic associations. Each generic
4512 /// association specifies a type name and an expression, or "default" and an
4513 /// expression (in which case it is known as a default generic association).
4514 /// The type and value of the generic selection are identical to those of its
4515 /// result expression, which is defined as the expression in the generic
4516 /// association with a type name that is compatible with the type of the
4517 /// controlling expression, or the expression in the default generic association
4518 /// if no types are compatible. For example:
4521 /// _Generic(X, double: 1, float: 2, default: 3)
4524 /// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f
4525 /// or 3 if "hello".
4527 /// As an extension, generic selections are allowed in C++, where the following
4528 /// additional semantics apply:
4530 /// Any generic selection whose controlling expression is type-dependent or
4531 /// which names a dependent type in its association list is result-dependent,
4532 /// which means that the choice of result expression is dependent.
4533 /// Result-dependent generic associations are both type- and value-dependent.
4534 class GenericSelectionExpr : public Expr {
4535 enum { CONTROLLING, END_EXPR };
4536 TypeSourceInfo **AssocTypes;
4538 unsigned NumAssocs, ResultIndex;
4539 SourceLocation GenericLoc, DefaultLoc, RParenLoc;
4542 GenericSelectionExpr(const ASTContext &Context,
4543 SourceLocation GenericLoc, Expr *ControllingExpr,
4544 ArrayRef<TypeSourceInfo*> AssocTypes,
4545 ArrayRef<Expr*> AssocExprs,
4546 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4547 bool ContainsUnexpandedParameterPack,
4548 unsigned ResultIndex);
4550 /// This constructor is used in the result-dependent case.
4551 GenericSelectionExpr(const ASTContext &Context,
4552 SourceLocation GenericLoc, Expr *ControllingExpr,
4553 ArrayRef<TypeSourceInfo*> AssocTypes,
4554 ArrayRef<Expr*> AssocExprs,
4555 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4556 bool ContainsUnexpandedParameterPack);
4558 explicit GenericSelectionExpr(EmptyShell Empty)
4559 : Expr(GenericSelectionExprClass, Empty) { }
4561 unsigned getNumAssocs() const { return NumAssocs; }
4563 SourceLocation getGenericLoc() const { return GenericLoc; }
4564 SourceLocation getDefaultLoc() const { return DefaultLoc; }
4565 SourceLocation getRParenLoc() const { return RParenLoc; }
4567 const Expr *getAssocExpr(unsigned i) const {
4568 return cast<Expr>(SubExprs[END_EXPR+i]);
4570 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); }
4571 ArrayRef<Expr *> getAssocExprs() const {
4573 ? llvm::makeArrayRef(
4574 &reinterpret_cast<Expr **>(SubExprs)[END_EXPR], NumAssocs)
4577 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const {
4578 return AssocTypes[i];
4580 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; }
4581 ArrayRef<TypeSourceInfo *> getAssocTypeSourceInfos() const {
4582 return NumAssocs ? llvm::makeArrayRef(&AssocTypes[0], NumAssocs) : None;
4585 QualType getAssocType(unsigned i) const {
4586 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i))
4587 return TS->getType();
4592 const Expr *getControllingExpr() const {
4593 return cast<Expr>(SubExprs[CONTROLLING]);
4595 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); }
4597 /// Whether this generic selection is result-dependent.
4598 bool isResultDependent() const { return ResultIndex == -1U; }
4600 /// The zero-based index of the result expression's generic association in
4601 /// the generic selection's association list. Defined only if the
4602 /// generic selection is not result-dependent.
4603 unsigned getResultIndex() const {
4604 assert(!isResultDependent() && "Generic selection is result-dependent");
4608 /// The generic selection's result expression. Defined only if the
4609 /// generic selection is not result-dependent.
4610 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); }
4611 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); }
4613 SourceLocation getLocStart() const LLVM_READONLY { return GenericLoc; }
4614 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
4616 static bool classof(const Stmt *T) {
4617 return T->getStmtClass() == GenericSelectionExprClass;
4620 child_range children() {
4621 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs);
4624 friend class ASTStmtReader;
4627 //===----------------------------------------------------------------------===//
4629 //===----------------------------------------------------------------------===//
4631 /// ExtVectorElementExpr - This represents access to specific elements of a
4632 /// vector, and may occur on the left hand side or right hand side. For example
4633 /// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector.
4635 /// Note that the base may have either vector or pointer to vector type, just
4636 /// like a struct field reference.
4638 class ExtVectorElementExpr : public Expr {
4640 IdentifierInfo *Accessor;
4641 SourceLocation AccessorLoc;
4643 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base,
4644 IdentifierInfo &accessor, SourceLocation loc)
4645 : Expr(ExtVectorElementExprClass, ty, VK,
4646 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent),
4647 base->isTypeDependent(), base->isValueDependent(),
4648 base->isInstantiationDependent(),
4649 base->containsUnexpandedParameterPack()),
4650 Base(base), Accessor(&accessor), AccessorLoc(loc) {}
4652 /// \brief Build an empty vector element expression.
4653 explicit ExtVectorElementExpr(EmptyShell Empty)
4654 : Expr(ExtVectorElementExprClass, Empty) { }
4656 const Expr *getBase() const { return cast<Expr>(Base); }
4657 Expr *getBase() { return cast<Expr>(Base); }
4658 void setBase(Expr *E) { Base = E; }
4660 IdentifierInfo &getAccessor() const { return *Accessor; }
4661 void setAccessor(IdentifierInfo *II) { Accessor = II; }
4663 SourceLocation getAccessorLoc() const { return AccessorLoc; }
4664 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; }
4666 /// getNumElements - Get the number of components being selected.
4667 unsigned getNumElements() const;
4669 /// containsDuplicateElements - Return true if any element access is
4671 bool containsDuplicateElements() const;
4673 /// getEncodedElementAccess - Encode the elements accessed into an llvm
4674 /// aggregate Constant of ConstantInt(s).
4675 void getEncodedElementAccess(SmallVectorImpl<uint32_t> &Elts) const;
4677 SourceLocation getLocStart() const LLVM_READONLY {
4678 return getBase()->getLocStart();
4680 SourceLocation getLocEnd() const LLVM_READONLY { return AccessorLoc; }
4682 /// isArrow - Return true if the base expression is a pointer to vector,
4683 /// return false if the base expression is a vector.
4684 bool isArrow() const;
4686 static bool classof(const Stmt *T) {
4687 return T->getStmtClass() == ExtVectorElementExprClass;
4691 child_range children() { return child_range(&Base, &Base+1); }
4694 /// BlockExpr - Adaptor class for mixing a BlockDecl with expressions.
4695 /// ^{ statement-body } or ^(int arg1, float arg2){ statement-body }
4696 class BlockExpr : public Expr {
4698 BlockDecl *TheBlock;
4700 BlockExpr(BlockDecl *BD, QualType ty)
4701 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary,
4702 ty->isDependentType(), ty->isDependentType(),
4703 ty->isInstantiationDependentType() || BD->isDependentContext(),
4707 /// \brief Build an empty block expression.
4708 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { }
4710 const BlockDecl *getBlockDecl() const { return TheBlock; }
4711 BlockDecl *getBlockDecl() { return TheBlock; }
4712 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; }
4714 // Convenience functions for probing the underlying BlockDecl.
4715 SourceLocation getCaretLocation() const;
4716 const Stmt *getBody() const;
4719 SourceLocation getLocStart() const LLVM_READONLY { return getCaretLocation(); }
4720 SourceLocation getLocEnd() const LLVM_READONLY { return getBody()->getLocEnd(); }
4722 /// getFunctionType - Return the underlying function type for this block.
4723 const FunctionProtoType *getFunctionType() const;
4725 static bool classof(const Stmt *T) {
4726 return T->getStmtClass() == BlockExprClass;
4730 child_range children() {
4731 return child_range(child_iterator(), child_iterator());
4735 /// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2]
4736 /// This AST node provides support for reinterpreting a type to another
4737 /// type of the same size.
4738 class AsTypeExpr : public Expr {
4741 SourceLocation BuiltinLoc, RParenLoc;
4743 friend class ASTReader;
4744 friend class ASTStmtReader;
4745 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {}
4748 AsTypeExpr(Expr* SrcExpr, QualType DstType,
4749 ExprValueKind VK, ExprObjectKind OK,
4750 SourceLocation BuiltinLoc, SourceLocation RParenLoc)
4751 : Expr(AsTypeExprClass, DstType, VK, OK,
4752 DstType->isDependentType(),
4753 DstType->isDependentType() || SrcExpr->isValueDependent(),
4754 (DstType->isInstantiationDependentType() ||
4755 SrcExpr->isInstantiationDependent()),
4756 (DstType->containsUnexpandedParameterPack() ||
4757 SrcExpr->containsUnexpandedParameterPack())),
4758 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {}
4760 /// getSrcExpr - Return the Expr to be converted.
4761 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); }
4763 /// getBuiltinLoc - Return the location of the __builtin_astype token.
4764 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
4766 /// getRParenLoc - Return the location of final right parenthesis.
4767 SourceLocation getRParenLoc() const { return RParenLoc; }
4769 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
4770 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
4772 static bool classof(const Stmt *T) {
4773 return T->getStmtClass() == AsTypeExprClass;
4777 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); }
4780 /// PseudoObjectExpr - An expression which accesses a pseudo-object
4781 /// l-value. A pseudo-object is an abstract object, accesses to which
4782 /// are translated to calls. The pseudo-object expression has a
4783 /// syntactic form, which shows how the expression was actually
4784 /// written in the source code, and a semantic form, which is a series
4785 /// of expressions to be executed in order which detail how the
4786 /// operation is actually evaluated. Optionally, one of the semantic
4787 /// forms may also provide a result value for the expression.
4789 /// If any of the semantic-form expressions is an OpaqueValueExpr,
4790 /// that OVE is required to have a source expression, and it is bound
4791 /// to the result of that source expression. Such OVEs may appear
4792 /// only in subsequent semantic-form expressions and as
4793 /// sub-expressions of the syntactic form.
4795 /// PseudoObjectExpr should be used only when an operation can be
4796 /// usefully described in terms of fairly simple rewrite rules on
4797 /// objects and functions that are meant to be used by end-developers.
4798 /// For example, under the Itanium ABI, dynamic casts are implemented
4799 /// as a call to a runtime function called __dynamic_cast; using this
4800 /// class to describe that would be inappropriate because that call is
4801 /// not really part of the user-visible semantics, and instead the
4802 /// cast is properly reflected in the AST and IR-generation has been
4803 /// taught to generate the call as necessary. In contrast, an
4804 /// Objective-C property access is semantically defined to be
4805 /// equivalent to a particular message send, and this is very much
4806 /// part of the user model. The name of this class encourages this
4807 /// modelling design.
4808 class PseudoObjectExpr final
4810 private llvm::TrailingObjects<PseudoObjectExpr, Expr *> {
4811 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions.
4812 // Always at least two, because the first sub-expression is the
4815 // PseudoObjectExprBits.ResultIndex - The index of the
4816 // sub-expression holding the result. 0 means the result is void,
4817 // which is unambiguous because it's the index of the syntactic
4818 // form. Note that this is therefore 1 higher than the value passed
4819 // in to Create, which is an index within the semantic forms.
4820 // Note also that ASTStmtWriter assumes this encoding.
4822 Expr **getSubExprsBuffer() { return getTrailingObjects<Expr *>(); }
4823 const Expr * const *getSubExprsBuffer() const {
4824 return getTrailingObjects<Expr *>();
4827 PseudoObjectExpr(QualType type, ExprValueKind VK,
4828 Expr *syntactic, ArrayRef<Expr*> semantic,
4829 unsigned resultIndex);
4831 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs);
4833 unsigned getNumSubExprs() const {
4834 return PseudoObjectExprBits.NumSubExprs;
4838 /// NoResult - A value for the result index indicating that there is
4839 /// no semantic result.
4840 enum : unsigned { NoResult = ~0U };
4842 static PseudoObjectExpr *Create(const ASTContext &Context, Expr *syntactic,
4843 ArrayRef<Expr*> semantic,
4844 unsigned resultIndex);
4846 static PseudoObjectExpr *Create(const ASTContext &Context, EmptyShell shell,
4847 unsigned numSemanticExprs);
4849 /// Return the syntactic form of this expression, i.e. the
4850 /// expression it actually looks like. Likely to be expressed in
4851 /// terms of OpaqueValueExprs bound in the semantic form.
4852 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; }
4853 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; }
4855 /// Return the index of the result-bearing expression into the semantics
4856 /// expressions, or PseudoObjectExpr::NoResult if there is none.
4857 unsigned getResultExprIndex() const {
4858 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult;
4859 return PseudoObjectExprBits.ResultIndex - 1;
4862 /// Return the result-bearing expression, or null if there is none.
4863 Expr *getResultExpr() {
4864 if (PseudoObjectExprBits.ResultIndex == 0)
4866 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex];
4868 const Expr *getResultExpr() const {
4869 return const_cast<PseudoObjectExpr*>(this)->getResultExpr();
4872 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; }
4874 typedef Expr * const *semantics_iterator;
4875 typedef const Expr * const *const_semantics_iterator;
4876 semantics_iterator semantics_begin() {
4877 return getSubExprsBuffer() + 1;
4879 const_semantics_iterator semantics_begin() const {
4880 return getSubExprsBuffer() + 1;
4882 semantics_iterator semantics_end() {
4883 return getSubExprsBuffer() + getNumSubExprs();
4885 const_semantics_iterator semantics_end() const {
4886 return getSubExprsBuffer() + getNumSubExprs();
4889 llvm::iterator_range<semantics_iterator> semantics() {
4890 return llvm::make_range(semantics_begin(), semantics_end());
4892 llvm::iterator_range<const_semantics_iterator> semantics() const {
4893 return llvm::make_range(semantics_begin(), semantics_end());
4896 Expr *getSemanticExpr(unsigned index) {
4897 assert(index + 1 < getNumSubExprs());
4898 return getSubExprsBuffer()[index + 1];
4900 const Expr *getSemanticExpr(unsigned index) const {
4901 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index);
4904 SourceLocation getExprLoc() const LLVM_READONLY {
4905 return getSyntacticForm()->getExprLoc();
4908 SourceLocation getLocStart() const LLVM_READONLY {
4909 return getSyntacticForm()->getLocStart();
4911 SourceLocation getLocEnd() const LLVM_READONLY {
4912 return getSyntacticForm()->getLocEnd();
4915 child_range children() {
4916 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer());
4917 return child_range(cs, cs + getNumSubExprs());
4920 static bool classof(const Stmt *T) {
4921 return T->getStmtClass() == PseudoObjectExprClass;
4924 friend TrailingObjects;
4925 friend class ASTStmtReader;
4928 /// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*,
4929 /// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the
4930 /// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>.
4931 /// All of these instructions take one primary pointer and at least one memory
4933 class AtomicExpr : public Expr {
4936 #define BUILTIN(ID, TYPE, ATTRS)
4937 #define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID,
4938 #include "clang/Basic/Builtins.def"
4939 // Avoid trailing comma
4944 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR };
4945 Stmt* SubExprs[END_EXPR];
4946 unsigned NumSubExprs;
4947 SourceLocation BuiltinLoc, RParenLoc;
4950 friend class ASTStmtReader;
4953 AtomicExpr(SourceLocation BLoc, ArrayRef<Expr*> args, QualType t,
4954 AtomicOp op, SourceLocation RP);
4956 /// \brief Determine the number of arguments the specified atomic builtin
4958 static unsigned getNumSubExprs(AtomicOp Op);
4960 /// \brief Build an empty AtomicExpr.
4961 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { }
4963 Expr *getPtr() const {
4964 return cast<Expr>(SubExprs[PTR]);
4966 Expr *getOrder() const {
4967 return cast<Expr>(SubExprs[ORDER]);
4969 Expr *getVal1() const {
4970 if (Op == AO__c11_atomic_init)
4971 return cast<Expr>(SubExprs[ORDER]);
4972 assert(NumSubExprs > VAL1);
4973 return cast<Expr>(SubExprs[VAL1]);
4975 Expr *getOrderFail() const {
4976 assert(NumSubExprs > ORDER_FAIL);
4977 return cast<Expr>(SubExprs[ORDER_FAIL]);
4979 Expr *getVal2() const {
4980 if (Op == AO__atomic_exchange)
4981 return cast<Expr>(SubExprs[ORDER_FAIL]);
4982 assert(NumSubExprs > VAL2);
4983 return cast<Expr>(SubExprs[VAL2]);
4985 Expr *getWeak() const {
4986 assert(NumSubExprs > WEAK);
4987 return cast<Expr>(SubExprs[WEAK]);
4990 AtomicOp getOp() const { return Op; }
4991 unsigned getNumSubExprs() const { return NumSubExprs; }
4993 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); }
4994 const Expr * const *getSubExprs() const {
4995 return reinterpret_cast<Expr * const *>(SubExprs);
4998 bool isVolatile() const {
4999 return getPtr()->getType()->getPointeeType().isVolatileQualified();
5002 bool isCmpXChg() const {
5003 return getOp() == AO__c11_atomic_compare_exchange_strong ||
5004 getOp() == AO__c11_atomic_compare_exchange_weak ||
5005 getOp() == AO__atomic_compare_exchange ||
5006 getOp() == AO__atomic_compare_exchange_n;
5009 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
5010 SourceLocation getRParenLoc() const { return RParenLoc; }
5012 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
5013 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
5015 static bool classof(const Stmt *T) {
5016 return T->getStmtClass() == AtomicExprClass;
5020 child_range children() {
5021 return child_range(SubExprs, SubExprs+NumSubExprs);
5025 /// TypoExpr - Internal placeholder for expressions where typo correction
5026 /// still needs to be performed and/or an error diagnostic emitted.
5027 class TypoExpr : public Expr {
5029 TypoExpr(QualType T)
5030 : Expr(TypoExprClass, T, VK_LValue, OK_Ordinary,
5031 /*isTypeDependent*/ true,
5032 /*isValueDependent*/ true,
5033 /*isInstantiationDependent*/ true,
5034 /*containsUnexpandedParameterPack*/ false) {
5035 assert(T->isDependentType() && "TypoExpr given a non-dependent type");
5038 child_range children() {
5039 return child_range(child_iterator(), child_iterator());
5041 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); }
5042 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); }
5044 static bool classof(const Stmt *T) {
5045 return T->getStmtClass() == TypoExprClass;
5049 } // end namespace clang
5051 #endif // LLVM_CLANG_AST_EXPR_H