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/TypeTraits.h"
27 #include "llvm/ADT/APFloat.h"
28 #include "llvm/ADT/APSInt.h"
29 #include "llvm/ADT/SmallVector.h"
30 #include "llvm/ADT/StringRef.h"
31 #include "llvm/Support/Compiler.h"
37 class CXXBaseSpecifier;
38 class CXXMemberCallExpr;
39 class CXXOperatorCallExpr;
43 class MaterializeTemporaryExpr;
45 class ObjCPropertyRefExpr;
46 class OpaqueValueExpr;
51 /// \brief A simple array of base specifiers.
52 typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
54 /// \brief An adjustment to be made to the temporary created when emitting a
55 /// reference binding, which accesses a particular subobject of that temporary.
56 struct SubobjectAdjustment {
58 DerivedToBaseAdjustment,
60 MemberPointerAdjustment
65 const CastExpr *BasePath;
66 const CXXRecordDecl *DerivedClass;
70 const MemberPointerType *MPT;
75 struct DTB DerivedToBase;
80 SubobjectAdjustment(const CastExpr *BasePath,
81 const CXXRecordDecl *DerivedClass)
82 : Kind(DerivedToBaseAdjustment) {
83 DerivedToBase.BasePath = BasePath;
84 DerivedToBase.DerivedClass = DerivedClass;
87 SubobjectAdjustment(FieldDecl *Field)
88 : Kind(FieldAdjustment) {
92 SubobjectAdjustment(const MemberPointerType *MPT, Expr *RHS)
93 : Kind(MemberPointerAdjustment) {
99 /// Expr - This represents one expression. Note that Expr's are subclasses of
100 /// Stmt. This allows an expression to be transparently used any place a Stmt
103 class Expr : public Stmt {
107 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK,
108 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack)
111 ExprBits.TypeDependent = TD;
112 ExprBits.ValueDependent = VD;
113 ExprBits.InstantiationDependent = ID;
114 ExprBits.ValueKind = VK;
115 ExprBits.ObjectKind = OK;
116 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack;
120 /// \brief Construct an empty expression.
121 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { }
124 QualType getType() const { return TR; }
125 void setType(QualType t) {
126 // In C++, the type of an expression is always adjusted so that it
127 // will not have reference type an expression will never have
128 // reference type (C++ [expr]p6). Use
129 // QualType::getNonReferenceType() to retrieve the non-reference
130 // type. Additionally, inspect Expr::isLvalue to determine whether
131 // an expression that is adjusted in this manner should be
132 // considered an lvalue.
133 assert((t.isNull() || !t->isReferenceType()) &&
134 "Expressions can't have reference type");
139 /// isValueDependent - Determines whether this expression is
140 /// value-dependent (C++ [temp.dep.constexpr]). For example, the
141 /// array bound of "Chars" in the following example is
144 /// template<int Size, char (&Chars)[Size]> struct meta_string;
146 bool isValueDependent() const { return ExprBits.ValueDependent; }
148 /// \brief Set whether this expression is value-dependent or not.
149 void setValueDependent(bool VD) {
150 ExprBits.ValueDependent = VD;
152 ExprBits.InstantiationDependent = true;
155 /// isTypeDependent - Determines whether this expression is
156 /// type-dependent (C++ [temp.dep.expr]), which means that its type
157 /// could change from one template instantiation to the next. For
158 /// example, the expressions "x" and "x + y" are type-dependent in
159 /// the following code, but "y" is not type-dependent:
161 /// template<typename T>
162 /// void add(T x, int y) {
166 bool isTypeDependent() const { return ExprBits.TypeDependent; }
168 /// \brief Set whether this expression is type-dependent or not.
169 void setTypeDependent(bool TD) {
170 ExprBits.TypeDependent = TD;
172 ExprBits.InstantiationDependent = true;
175 /// \brief Whether this expression is instantiation-dependent, meaning that
176 /// it depends in some way on a template parameter, even if neither its type
177 /// nor (constant) value can change due to the template instantiation.
179 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is
180 /// instantiation-dependent (since it involves a template parameter \c T), but
181 /// is neither type- nor value-dependent, since the type of the inner
182 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer
183 /// \c sizeof is known.
186 /// template<typename T>
187 /// void f(T x, T y) {
188 /// sizeof(sizeof(T() + T());
192 bool isInstantiationDependent() const {
193 return ExprBits.InstantiationDependent;
196 /// \brief Set whether this expression is instantiation-dependent or not.
197 void setInstantiationDependent(bool ID) {
198 ExprBits.InstantiationDependent = ID;
201 /// \brief Whether this expression contains an unexpanded parameter
202 /// pack (for C++11 variadic templates).
204 /// Given the following function template:
207 /// template<typename F, typename ...Types>
208 /// void forward(const F &f, Types &&...args) {
209 /// f(static_cast<Types&&>(args)...);
213 /// The expressions \c args and \c static_cast<Types&&>(args) both
214 /// contain parameter packs.
215 bool containsUnexpandedParameterPack() const {
216 return ExprBits.ContainsUnexpandedParameterPack;
219 /// \brief Set the bit that describes whether this expression
220 /// contains an unexpanded parameter pack.
221 void setContainsUnexpandedParameterPack(bool PP = true) {
222 ExprBits.ContainsUnexpandedParameterPack = PP;
225 /// getExprLoc - Return the preferred location for the arrow when diagnosing
226 /// a problem with a generic expression.
227 SourceLocation getExprLoc() const LLVM_READONLY;
229 /// isUnusedResultAWarning - Return true if this immediate expression should
230 /// be warned about if the result is unused. If so, fill in expr, location,
231 /// and ranges with expr to warn on and source locations/ranges appropriate
233 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc,
234 SourceRange &R1, SourceRange &R2,
235 ASTContext &Ctx) const;
237 /// isLValue - True if this expression is an "l-value" according to
238 /// the rules of the current language. C and C++ give somewhat
239 /// different rules for this concept, but in general, the result of
240 /// an l-value expression identifies a specific object whereas the
241 /// result of an r-value expression is a value detached from any
242 /// specific storage.
244 /// C++11 divides the concept of "r-value" into pure r-values
245 /// ("pr-values") and so-called expiring values ("x-values"), which
246 /// identify specific objects that can be safely cannibalized for
247 /// their resources. This is an unfortunate abuse of terminology on
248 /// the part of the C++ committee. In Clang, when we say "r-value",
249 /// we generally mean a pr-value.
250 bool isLValue() const { return getValueKind() == VK_LValue; }
251 bool isRValue() const { return getValueKind() == VK_RValue; }
252 bool isXValue() const { return getValueKind() == VK_XValue; }
253 bool isGLValue() const { return getValueKind() != VK_RValue; }
255 enum LValueClassification {
258 LV_IncompleteVoidType,
259 LV_DuplicateVectorComponents,
260 LV_InvalidExpression,
261 LV_InvalidMessageExpression,
263 LV_SubObjCPropertySetting,
267 /// Reasons why an expression might not be an l-value.
268 LValueClassification ClassifyLValue(ASTContext &Ctx) const;
270 enum isModifiableLvalueResult {
273 MLV_IncompleteVoidType,
274 MLV_DuplicateVectorComponents,
275 MLV_InvalidExpression,
276 MLV_LValueCast, // Specialized form of MLV_InvalidExpression.
280 MLV_ReadonlyProperty,
281 MLV_NoSetterProperty,
283 MLV_SubObjCPropertySetting,
284 MLV_InvalidMessageExpression,
288 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
289 /// does not have an incomplete type, does not have a const-qualified type,
290 /// and if it is a structure or union, does not have any member (including,
291 /// recursively, any member or element of all contained aggregates or unions)
292 /// with a const-qualified type.
294 /// \param Loc [in,out] - A source location which *may* be filled
295 /// in with the location of the expression making this a
296 /// non-modifiable lvalue, if specified.
297 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx,
298 SourceLocation *Loc = 0) const;
300 /// \brief The return type of classify(). Represents the C++11 expression
302 class Classification {
304 /// \brief The various classification results. Most of these mean prvalue.
308 CL_Function, // Functions cannot be lvalues in C.
309 CL_Void, // Void cannot be an lvalue in C.
310 CL_AddressableVoid, // Void expression whose address can be taken in C.
311 CL_DuplicateVectorComponents, // A vector shuffle with dupes.
312 CL_MemberFunction, // An expression referring to a member function
313 CL_SubObjCPropertySetting,
314 CL_ClassTemporary, // A temporary of class type, or subobject thereof.
315 CL_ArrayTemporary, // A temporary of array type.
316 CL_ObjCMessageRValue, // ObjC message is an rvalue
317 CL_PRValue // A prvalue for any other reason, of any other type
319 /// \brief The results of modification testing.
320 enum ModifiableType {
321 CM_Untested, // testModifiable was false.
323 CM_RValue, // Not modifiable because it's an rvalue
324 CM_Function, // Not modifiable because it's a function; C++ only
325 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext
326 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter
336 unsigned short Modifiable;
338 explicit Classification(Kinds k, ModifiableType m)
339 : Kind(k), Modifiable(m)
345 Kinds getKind() const { return static_cast<Kinds>(Kind); }
346 ModifiableType getModifiable() const {
347 assert(Modifiable != CM_Untested && "Did not test for modifiability.");
348 return static_cast<ModifiableType>(Modifiable);
350 bool isLValue() const { return Kind == CL_LValue; }
351 bool isXValue() const { return Kind == CL_XValue; }
352 bool isGLValue() const { return Kind <= CL_XValue; }
353 bool isPRValue() const { return Kind >= CL_Function; }
354 bool isRValue() const { return Kind >= CL_XValue; }
355 bool isModifiable() const { return getModifiable() == CM_Modifiable; }
357 /// \brief Create a simple, modifiably lvalue
358 static Classification makeSimpleLValue() {
359 return Classification(CL_LValue, CM_Modifiable);
363 /// \brief Classify - Classify this expression according to the C++11
364 /// expression taxonomy.
366 /// C++11 defines ([basic.lval]) a new taxonomy of expressions to replace the
367 /// old lvalue vs rvalue. This function determines the type of expression this
368 /// is. There are three expression types:
369 /// - lvalues are classical lvalues as in C++03.
370 /// - prvalues are equivalent to rvalues in C++03.
371 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a
372 /// function returning an rvalue reference.
373 /// lvalues and xvalues are collectively referred to as glvalues, while
374 /// prvalues and xvalues together form rvalues.
375 Classification Classify(ASTContext &Ctx) const {
376 return ClassifyImpl(Ctx, 0);
379 /// \brief ClassifyModifiable - Classify this expression according to the
380 /// C++11 expression taxonomy, and see if it is valid on the left side
381 /// of an assignment.
383 /// This function extends classify in that it also tests whether the
384 /// expression is modifiable (C99 6.3.2.1p1).
385 /// \param Loc A source location that might be filled with a relevant location
386 /// if the expression is not modifiable.
387 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{
388 return ClassifyImpl(Ctx, &Loc);
391 /// getValueKindForType - Given a formal return or parameter type,
392 /// give its value kind.
393 static ExprValueKind getValueKindForType(QualType T) {
394 if (const ReferenceType *RT = T->getAs<ReferenceType>())
395 return (isa<LValueReferenceType>(RT)
397 : (RT->getPointeeType()->isFunctionType()
398 ? VK_LValue : VK_XValue));
402 /// getValueKind - The value kind that this expression produces.
403 ExprValueKind getValueKind() const {
404 return static_cast<ExprValueKind>(ExprBits.ValueKind);
407 /// getObjectKind - The object kind that this expression produces.
408 /// Object kinds are meaningful only for expressions that yield an
409 /// l-value or x-value.
410 ExprObjectKind getObjectKind() const {
411 return static_cast<ExprObjectKind>(ExprBits.ObjectKind);
414 bool isOrdinaryOrBitFieldObject() const {
415 ExprObjectKind OK = getObjectKind();
416 return (OK == OK_Ordinary || OK == OK_BitField);
419 /// setValueKind - Set the value kind produced by this expression.
420 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; }
422 /// setObjectKind - Set the object kind produced by this expression.
423 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; }
426 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const;
430 /// \brief Returns true if this expression is a gl-value that
431 /// potentially refers to a bit-field.
433 /// In C++, whether a gl-value refers to a bitfield is essentially
434 /// an aspect of the value-kind type system.
435 bool refersToBitField() const { return getObjectKind() == OK_BitField; }
437 /// \brief If this expression refers to a bit-field, retrieve the
438 /// declaration of that bit-field.
440 /// Note that this returns a non-null pointer in subtly different
441 /// places than refersToBitField returns true. In particular, this can
442 /// return a non-null pointer even for r-values loaded from
443 /// bit-fields, but it will return null for a conditional bit-field.
444 FieldDecl *getSourceBitField();
446 const FieldDecl *getSourceBitField() const {
447 return const_cast<Expr*>(this)->getSourceBitField();
450 /// \brief If this expression is an l-value for an Objective C
451 /// property, find the underlying property reference expression.
452 const ObjCPropertyRefExpr *getObjCProperty() const;
454 /// \brief Check if this expression is the ObjC 'self' implicit parameter.
455 bool isObjCSelfExpr() const;
457 /// \brief Returns whether this expression refers to a vector element.
458 bool refersToVectorElement() const;
460 /// \brief Returns whether this expression has a placeholder type.
461 bool hasPlaceholderType() const {
462 return getType()->isPlaceholderType();
465 /// \brief Returns whether this expression has a specific placeholder type.
466 bool hasPlaceholderType(BuiltinType::Kind K) const {
467 assert(BuiltinType::isPlaceholderTypeKind(K));
468 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType()))
469 return BT->getKind() == K;
473 /// isKnownToHaveBooleanValue - Return true if this is an integer expression
474 /// that is known to return 0 or 1. This happens for _Bool/bool expressions
475 /// but also int expressions which are produced by things like comparisons in
477 bool isKnownToHaveBooleanValue() const;
479 /// isIntegerConstantExpr - Return true if this expression is a valid integer
480 /// constant expression, and, if so, return its value in Result. If not a
481 /// valid i-c-e, return false and fill in Loc (if specified) with the location
482 /// of the invalid expression.
484 /// Note: This does not perform the implicit conversions required by C++11
486 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx,
487 SourceLocation *Loc = 0,
488 bool isEvaluated = true) const;
489 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const;
491 /// isCXX98IntegralConstantExpr - Return true if this expression is an
492 /// integral constant expression in C++98. Can only be used in C++.
493 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const;
495 /// isCXX11ConstantExpr - Return true if this expression is a constant
496 /// expression in C++11. Can only be used in C++.
498 /// Note: This does not perform the implicit conversions required by C++11
500 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0,
501 SourceLocation *Loc = 0) const;
503 /// isPotentialConstantExpr - Return true if this function's definition
504 /// might be usable in a constant expression in C++11, if it were marked
505 /// constexpr. Return false if the function can never produce a constant
506 /// expression, along with diagnostics describing why not.
507 static bool isPotentialConstantExpr(const FunctionDecl *FD,
509 PartialDiagnosticAt> &Diags);
511 /// isConstantInitializer - Returns true if this expression can be emitted to
512 /// IR as a constant, and thus can be used as a constant initializer in C.
513 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const;
515 /// EvalStatus is a struct with detailed info about an evaluation in progress.
517 /// HasSideEffects - Whether the evaluated expression has side effects.
518 /// For example, (f() && 0) can be folded, but it still has side effects.
521 /// Diag - If this is non-null, it will be filled in with a stack of notes
522 /// indicating why evaluation failed (or why it failed to produce a constant
524 /// If the expression is unfoldable, the notes will indicate why it's not
525 /// foldable. If the expression is foldable, but not a constant expression,
526 /// the notes will describes why it isn't a constant expression. If the
527 /// expression *is* a constant expression, no notes will be produced.
528 SmallVectorImpl<PartialDiagnosticAt> *Diag;
530 EvalStatus() : HasSideEffects(false), Diag(0) {}
532 // hasSideEffects - Return true if the evaluated expression has
534 bool hasSideEffects() const {
535 return HasSideEffects;
539 /// EvalResult is a struct with detailed info about an evaluated expression.
540 struct EvalResult : EvalStatus {
541 /// Val - This is the value the expression can be folded to.
544 // isGlobalLValue - Return true if the evaluated lvalue expression
546 bool isGlobalLValue() const;
549 /// EvaluateAsRValue - Return true if this is a constant which we can fold to
550 /// an rvalue using any crazy technique (that has nothing to do with language
551 /// standards) that we want to, even if the expression has side-effects. If
552 /// this function returns true, it returns the folded constant in Result. If
553 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be
555 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const;
557 /// EvaluateAsBooleanCondition - Return true if this is a constant
558 /// which we we can fold and convert to a boolean condition using
559 /// any crazy technique that we want to, even if the expression has
561 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const;
563 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects };
565 /// EvaluateAsInt - Return true if this is a constant which we can fold and
566 /// convert to an integer, using any crazy technique that we want to.
567 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx,
568 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const;
570 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be
571 /// constant folded without side-effects, but discard the result.
572 bool isEvaluatable(const ASTContext &Ctx) const;
574 /// HasSideEffects - This routine returns true for all those expressions
575 /// which have any effect other than producing a value. Example is a function
576 /// call, volatile variable read, or throwing an exception.
577 bool HasSideEffects(const ASTContext &Ctx) const;
579 /// \brief Determine whether this expression involves a call to any function
580 /// that is not trivial.
581 bool hasNonTrivialCall(ASTContext &Ctx);
583 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded
584 /// integer. This must be called on an expression that constant folds to an
586 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx,
587 SmallVectorImpl<PartialDiagnosticAt> *Diag=0) const;
589 void EvaluateForOverflow(const ASTContext &Ctx,
590 SmallVectorImpl<PartialDiagnosticAt> *Diag) const;
592 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an
593 /// lvalue with link time known address, with no side-effects.
594 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const;
596 /// EvaluateAsInitializer - Evaluate an expression as if it were the
597 /// initializer of the given declaration. Returns true if the initializer
598 /// can be folded to a constant, and produces any relevant notes. In C++11,
599 /// notes will be produced if the expression is not a constant expression.
600 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx,
602 SmallVectorImpl<PartialDiagnosticAt> &Notes) const;
604 /// \brief Enumeration used to describe the kind of Null pointer constant
605 /// returned from \c isNullPointerConstant().
606 enum NullPointerConstantKind {
607 /// \brief Expression is not a Null pointer constant.
610 /// \brief Expression is a Null pointer constant built from a zero integer
611 /// expression that is not a simple, possibly parenthesized, zero literal.
612 /// C++ Core Issue 903 will classify these expressions as "not pointers"
613 /// once it is adopted.
614 /// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903
617 /// \brief Expression is a Null pointer constant built from a literal zero.
620 /// \brief Expression is a C++11 nullptr.
623 /// \brief Expression is a GNU-style __null constant.
627 /// \brief Enumeration used to describe how \c isNullPointerConstant()
628 /// should cope with value-dependent expressions.
629 enum NullPointerConstantValueDependence {
630 /// \brief Specifies that the expression should never be value-dependent.
631 NPC_NeverValueDependent = 0,
633 /// \brief Specifies that a value-dependent expression of integral or
634 /// dependent type should be considered a null pointer constant.
635 NPC_ValueDependentIsNull,
637 /// \brief Specifies that a value-dependent expression should be considered
638 /// to never be a null pointer constant.
639 NPC_ValueDependentIsNotNull
642 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to
643 /// a Null pointer constant. The return value can further distinguish the
644 /// kind of NULL pointer constant that was detected.
645 NullPointerConstantKind isNullPointerConstant(
647 NullPointerConstantValueDependence NPC) const;
649 /// isOBJCGCCandidate - Return true if this expression may be used in a read/
651 bool isOBJCGCCandidate(ASTContext &Ctx) const;
653 /// \brief Returns true if this expression is a bound member function.
654 bool isBoundMemberFunction(ASTContext &Ctx) const;
656 /// \brief Given an expression of bound-member type, find the type
657 /// of the member. Returns null if this is an *overloaded* bound
658 /// member expression.
659 static QualType findBoundMemberType(const Expr *expr);
661 /// IgnoreImpCasts - Skip past any implicit casts which might
662 /// surround this expression. Only skips ImplicitCastExprs.
663 Expr *IgnoreImpCasts() LLVM_READONLY;
665 /// IgnoreImplicit - Skip past any implicit AST nodes which might
666 /// surround this expression.
667 Expr *IgnoreImplicit() LLVM_READONLY {
668 return cast<Expr>(Stmt::IgnoreImplicit());
671 const Expr *IgnoreImplicit() const LLVM_READONLY {
672 return const_cast<Expr*>(this)->IgnoreImplicit();
675 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return
676 /// its subexpression. If that subexpression is also a ParenExpr,
677 /// then this method recursively returns its subexpression, and so forth.
678 /// Otherwise, the method returns the current Expr.
679 Expr *IgnoreParens() LLVM_READONLY;
681 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr
682 /// or CastExprs, returning their operand.
683 Expr *IgnoreParenCasts() LLVM_READONLY;
685 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off
686 /// any ParenExpr or ImplicitCastExprs, returning their operand.
687 Expr *IgnoreParenImpCasts() LLVM_READONLY;
689 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a
690 /// call to a conversion operator, return the argument.
691 Expr *IgnoreConversionOperator() LLVM_READONLY;
693 const Expr *IgnoreConversionOperator() const LLVM_READONLY {
694 return const_cast<Expr*>(this)->IgnoreConversionOperator();
697 const Expr *IgnoreParenImpCasts() const LLVM_READONLY {
698 return const_cast<Expr*>(this)->IgnoreParenImpCasts();
701 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and
702 /// CastExprs that represent lvalue casts, returning their operand.
703 Expr *IgnoreParenLValueCasts() LLVM_READONLY;
705 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY {
706 return const_cast<Expr*>(this)->IgnoreParenLValueCasts();
709 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the
710 /// value (including ptr->int casts of the same size). Strip off any
711 /// ParenExpr or CastExprs, returning their operand.
712 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY;
714 /// Ignore parentheses and derived-to-base casts.
715 Expr *ignoreParenBaseCasts() LLVM_READONLY;
717 const Expr *ignoreParenBaseCasts() const LLVM_READONLY {
718 return const_cast<Expr*>(this)->ignoreParenBaseCasts();
721 /// \brief Determine whether this expression is a default function argument.
723 /// Default arguments are implicitly generated in the abstract syntax tree
724 /// by semantic analysis for function calls, object constructions, etc. in
725 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes;
726 /// this routine also looks through any implicit casts to determine whether
727 /// the expression is a default argument.
728 bool isDefaultArgument() const;
730 /// \brief Determine whether the result of this expression is a
731 /// temporary object of the given class type.
732 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const;
734 /// \brief Whether this expression is an implicit reference to 'this' in C++.
735 bool isImplicitCXXThis() const;
737 const Expr *IgnoreImpCasts() const LLVM_READONLY {
738 return const_cast<Expr*>(this)->IgnoreImpCasts();
740 const Expr *IgnoreParens() const LLVM_READONLY {
741 return const_cast<Expr*>(this)->IgnoreParens();
743 const Expr *IgnoreParenCasts() const LLVM_READONLY {
744 return const_cast<Expr*>(this)->IgnoreParenCasts();
746 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY {
747 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx);
750 static bool hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs);
752 /// \brief For an expression of class type or pointer to class type,
753 /// return the most derived class decl the expression is known to refer to.
755 /// If this expression is a cast, this method looks through it to find the
756 /// most derived decl that can be inferred from the expression.
757 /// This is valid because derived-to-base conversions have undefined
758 /// behavior if the object isn't dynamically of the derived type.
759 const CXXRecordDecl *getBestDynamicClassType() const;
761 /// Walk outwards from an expression we want to bind a reference to and
762 /// find the expression whose lifetime needs to be extended. Record
763 /// the adjustments needed along the path.
765 skipRValueSubobjectAdjustments(
766 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const;
768 /// Skip irrelevant expressions to find what should be materialize for
769 /// binding with a reference.
771 findMaterializedTemporary(const MaterializeTemporaryExpr *&MTE) const;
773 static bool classof(const Stmt *T) {
774 return T->getStmtClass() >= firstExprConstant &&
775 T->getStmtClass() <= lastExprConstant;
780 //===----------------------------------------------------------------------===//
781 // Primary Expressions.
782 //===----------------------------------------------------------------------===//
784 /// OpaqueValueExpr - An expression referring to an opaque object of a
785 /// fixed type and value class. These don't correspond to concrete
786 /// syntax; instead they're used to express operations (usually copy
787 /// operations) on values whose source is generally obvious from
789 class OpaqueValueExpr : public Expr {
790 friend class ASTStmtReader;
795 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK,
796 ExprObjectKind OK = OK_Ordinary,
797 Expr *SourceExpr = 0)
798 : Expr(OpaqueValueExprClass, T, VK, OK,
799 T->isDependentType(),
800 T->isDependentType() ||
801 (SourceExpr && SourceExpr->isValueDependent()),
802 T->isInstantiationDependentType(),
804 SourceExpr(SourceExpr), Loc(Loc) {
807 /// Given an expression which invokes a copy constructor --- i.e. a
808 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups ---
809 /// find the OpaqueValueExpr that's the source of the construction.
810 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr);
812 explicit OpaqueValueExpr(EmptyShell Empty)
813 : Expr(OpaqueValueExprClass, Empty) { }
815 /// \brief Retrieve the location of this expression.
816 SourceLocation getLocation() const { return Loc; }
818 SourceLocation getLocStart() const LLVM_READONLY {
819 return SourceExpr ? SourceExpr->getLocStart() : Loc;
821 SourceLocation getLocEnd() const LLVM_READONLY {
822 return SourceExpr ? SourceExpr->getLocEnd() : Loc;
824 SourceLocation getExprLoc() const LLVM_READONLY {
825 if (SourceExpr) return SourceExpr->getExprLoc();
829 child_range children() { return child_range(); }
831 /// The source expression of an opaque value expression is the
832 /// expression which originally generated the value. This is
833 /// provided as a convenience for analyses that don't wish to
834 /// precisely model the execution behavior of the program.
836 /// The source expression is typically set when building the
837 /// expression which binds the opaque value expression in the first
839 Expr *getSourceExpr() const { return SourceExpr; }
841 static bool classof(const Stmt *T) {
842 return T->getStmtClass() == OpaqueValueExprClass;
846 /// \brief A reference to a declared variable, function, enum, etc.
849 /// This encodes all the information about how a declaration is referenced
850 /// within an expression.
852 /// There are several optional constructs attached to DeclRefExprs only when
853 /// they apply in order to conserve memory. These are laid out past the end of
854 /// the object, and flags in the DeclRefExprBitfield track whether they exist:
856 /// DeclRefExprBits.HasQualifier:
857 /// Specifies when this declaration reference expression has a C++
858 /// nested-name-specifier.
859 /// DeclRefExprBits.HasFoundDecl:
860 /// Specifies when this declaration reference expression has a record of
861 /// a NamedDecl (different from the referenced ValueDecl) which was found
862 /// during name lookup and/or overload resolution.
863 /// DeclRefExprBits.HasTemplateKWAndArgsInfo:
864 /// Specifies when this declaration reference expression has an explicit
865 /// C++ template keyword and/or template argument list.
866 /// DeclRefExprBits.RefersToEnclosingLocal
867 /// Specifies when this declaration reference expression (validly)
868 /// refers to a local variable from a different function.
869 class DeclRefExpr : public Expr {
870 /// \brief The declaration that we are referencing.
873 /// \brief The location of the declaration name itself.
876 /// \brief Provides source/type location info for the declaration name
878 DeclarationNameLoc DNLoc;
880 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc.
881 NestedNameSpecifierLoc &getInternalQualifierLoc() {
882 assert(hasQualifier());
883 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1);
886 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc.
887 const NestedNameSpecifierLoc &getInternalQualifierLoc() const {
888 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc();
891 /// \brief Test whether there is a distinct FoundDecl attached to the end of
893 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; }
895 /// \brief Helper to retrieve the optional NamedDecl through which this
896 /// reference occured.
897 NamedDecl *&getInternalFoundDecl() {
898 assert(hasFoundDecl());
900 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1);
901 return *reinterpret_cast<NamedDecl **>(this + 1);
904 /// \brief Helper to retrieve the optional NamedDecl through which this
905 /// reference occured.
906 NamedDecl *getInternalFoundDecl() const {
907 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl();
910 DeclRefExpr(ASTContext &Ctx,
911 NestedNameSpecifierLoc QualifierLoc,
912 SourceLocation TemplateKWLoc,
913 ValueDecl *D, bool refersToEnclosingLocal,
914 const DeclarationNameInfo &NameInfo,
916 const TemplateArgumentListInfo *TemplateArgs,
917 QualType T, ExprValueKind VK);
919 /// \brief Construct an empty declaration reference expression.
920 explicit DeclRefExpr(EmptyShell Empty)
921 : Expr(DeclRefExprClass, Empty) { }
923 /// \brief Computes the type- and value-dependence flags for this
924 /// declaration reference expression.
925 void computeDependence(ASTContext &C);
928 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T,
929 ExprValueKind VK, SourceLocation L,
930 const DeclarationNameLoc &LocInfo = DeclarationNameLoc())
931 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false),
932 D(D), Loc(L), DNLoc(LocInfo) {
933 DeclRefExprBits.HasQualifier = 0;
934 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0;
935 DeclRefExprBits.HasFoundDecl = 0;
936 DeclRefExprBits.HadMultipleCandidates = 0;
937 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal;
938 computeDependence(D->getASTContext());
941 static DeclRefExpr *Create(ASTContext &Context,
942 NestedNameSpecifierLoc QualifierLoc,
943 SourceLocation TemplateKWLoc,
945 bool isEnclosingLocal,
946 SourceLocation NameLoc,
947 QualType T, ExprValueKind VK,
948 NamedDecl *FoundD = 0,
949 const TemplateArgumentListInfo *TemplateArgs = 0);
951 static DeclRefExpr *Create(ASTContext &Context,
952 NestedNameSpecifierLoc QualifierLoc,
953 SourceLocation TemplateKWLoc,
955 bool isEnclosingLocal,
956 const DeclarationNameInfo &NameInfo,
957 QualType T, ExprValueKind VK,
958 NamedDecl *FoundD = 0,
959 const TemplateArgumentListInfo *TemplateArgs = 0);
961 /// \brief Construct an empty declaration reference expression.
962 static DeclRefExpr *CreateEmpty(ASTContext &Context,
965 bool HasTemplateKWAndArgsInfo,
966 unsigned NumTemplateArgs);
968 ValueDecl *getDecl() { return D; }
969 const ValueDecl *getDecl() const { return D; }
970 void setDecl(ValueDecl *NewD) { D = NewD; }
972 DeclarationNameInfo getNameInfo() const {
973 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc);
976 SourceLocation getLocation() const { return Loc; }
977 void setLocation(SourceLocation L) { Loc = L; }
978 SourceLocation getLocStart() const LLVM_READONLY;
979 SourceLocation getLocEnd() const LLVM_READONLY;
981 /// \brief Determine whether this declaration reference was preceded by a
982 /// C++ nested-name-specifier, e.g., \c N::foo.
983 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; }
985 /// \brief If the name was qualified, retrieves the nested-name-specifier
986 /// that precedes the name. Otherwise, returns NULL.
987 NestedNameSpecifier *getQualifier() const {
991 return getInternalQualifierLoc().getNestedNameSpecifier();
994 /// \brief If the name was qualified, retrieves the nested-name-specifier
995 /// that precedes the name, with source-location information.
996 NestedNameSpecifierLoc getQualifierLoc() const {
998 return NestedNameSpecifierLoc();
1000 return getInternalQualifierLoc();
1003 /// \brief Get the NamedDecl through which this reference occured.
1005 /// This Decl may be different from the ValueDecl actually referred to in the
1006 /// presence of using declarations, etc. It always returns non-NULL, and may
1007 /// simple return the ValueDecl when appropriate.
1008 NamedDecl *getFoundDecl() {
1009 return hasFoundDecl() ? getInternalFoundDecl() : D;
1012 /// \brief Get the NamedDecl through which this reference occurred.
1013 /// See non-const variant.
1014 const NamedDecl *getFoundDecl() const {
1015 return hasFoundDecl() ? getInternalFoundDecl() : D;
1018 bool hasTemplateKWAndArgsInfo() const {
1019 return DeclRefExprBits.HasTemplateKWAndArgsInfo;
1022 /// \brief Return the optional template keyword and arguments info.
1023 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() {
1024 if (!hasTemplateKWAndArgsInfo())
1028 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(
1029 &getInternalFoundDecl() + 1);
1032 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(
1033 &getInternalQualifierLoc() + 1);
1035 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1);
1038 /// \brief Return the optional template keyword and arguments info.
1039 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const {
1040 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo();
1043 /// \brief Retrieve the location of the template keyword preceding
1044 /// this name, if any.
1045 SourceLocation getTemplateKeywordLoc() const {
1046 if (!hasTemplateKWAndArgsInfo()) return SourceLocation();
1047 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc();
1050 /// \brief Retrieve the location of the left angle bracket starting the
1051 /// explicit template argument list following the name, if any.
1052 SourceLocation getLAngleLoc() const {
1053 if (!hasTemplateKWAndArgsInfo()) return SourceLocation();
1054 return getTemplateKWAndArgsInfo()->LAngleLoc;
1057 /// \brief Retrieve the location of the right angle bracket ending the
1058 /// explicit template argument list following the name, if any.
1059 SourceLocation getRAngleLoc() const {
1060 if (!hasTemplateKWAndArgsInfo()) return SourceLocation();
1061 return getTemplateKWAndArgsInfo()->RAngleLoc;
1064 /// \brief Determines whether the name in this declaration reference
1065 /// was preceded by the template keyword.
1066 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }
1068 /// \brief Determines whether this declaration reference was followed by an
1069 /// explicit template argument list.
1070 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }
1072 /// \brief Retrieve the explicit template argument list that followed the
1073 /// member template name.
1074 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() {
1075 assert(hasExplicitTemplateArgs());
1076 return *getTemplateKWAndArgsInfo();
1079 /// \brief Retrieve the explicit template argument list that followed the
1080 /// member template name.
1081 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const {
1082 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs();
1085 /// \brief Retrieves the optional explicit template arguments.
1086 /// This points to the same data as getExplicitTemplateArgs(), but
1087 /// returns null if there are no explicit template arguments.
1088 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const {
1089 if (!hasExplicitTemplateArgs()) return 0;
1090 return &getExplicitTemplateArgs();
1093 /// \brief Copies the template arguments (if present) into the given
1095 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
1096 if (hasExplicitTemplateArgs())
1097 getExplicitTemplateArgs().copyInto(List);
1100 /// \brief Retrieve the template arguments provided as part of this
1102 const TemplateArgumentLoc *getTemplateArgs() const {
1103 if (!hasExplicitTemplateArgs())
1106 return getExplicitTemplateArgs().getTemplateArgs();
1109 /// \brief Retrieve the number of template arguments provided as part of this
1111 unsigned getNumTemplateArgs() const {
1112 if (!hasExplicitTemplateArgs())
1115 return getExplicitTemplateArgs().NumTemplateArgs;
1118 /// \brief Returns true if this expression refers to a function that
1119 /// was resolved from an overloaded set having size greater than 1.
1120 bool hadMultipleCandidates() const {
1121 return DeclRefExprBits.HadMultipleCandidates;
1123 /// \brief Sets the flag telling whether this expression refers to
1124 /// a function that was resolved from an overloaded set having size
1126 void setHadMultipleCandidates(bool V = true) {
1127 DeclRefExprBits.HadMultipleCandidates = V;
1130 /// Does this DeclRefExpr refer to a local declaration from an
1131 /// enclosing function scope?
1132 bool refersToEnclosingLocal() const {
1133 return DeclRefExprBits.RefersToEnclosingLocal;
1136 static bool classof(const Stmt *T) {
1137 return T->getStmtClass() == DeclRefExprClass;
1141 child_range children() { return child_range(); }
1143 friend class ASTStmtReader;
1144 friend class ASTStmtWriter;
1147 /// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__.
1148 class PredefinedExpr : public Expr {
1153 LFunction, // Same as Function, but as wide string.
1155 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the
1156 /// 'virtual' keyword is omitted for virtual member functions.
1157 PrettyFunctionNoVirtual
1164 PredefinedExpr(SourceLocation l, QualType type, IdentType IT)
1165 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary,
1166 type->isDependentType(), type->isDependentType(),
1167 type->isInstantiationDependentType(),
1168 /*ContainsUnexpandedParameterPack=*/false),
1171 /// \brief Construct an empty predefined expression.
1172 explicit PredefinedExpr(EmptyShell Empty)
1173 : Expr(PredefinedExprClass, Empty) { }
1175 IdentType getIdentType() const { return Type; }
1176 void setIdentType(IdentType IT) { Type = IT; }
1178 SourceLocation getLocation() const { return Loc; }
1179 void setLocation(SourceLocation L) { Loc = L; }
1181 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl);
1183 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
1184 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
1186 static bool classof(const Stmt *T) {
1187 return T->getStmtClass() == PredefinedExprClass;
1191 child_range children() { return child_range(); }
1194 /// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without
1197 /// For large floats/integers, APFloat/APInt will allocate memory from the heap
1198 /// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator
1199 /// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with
1200 /// the APFloat/APInt values will never get freed. APNumericStorage uses
1201 /// ASTContext's allocator for memory allocation.
1202 class APNumericStorage {
1204 uint64_t VAL; ///< Used to store the <= 64 bits integer value.
1205 uint64_t *pVal; ///< Used to store the >64 bits integer value.
1209 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; }
1211 APNumericStorage(const APNumericStorage &) LLVM_DELETED_FUNCTION;
1212 void operator=(const APNumericStorage &) LLVM_DELETED_FUNCTION;
1215 APNumericStorage() : VAL(0), BitWidth(0) { }
1217 llvm::APInt getIntValue() const {
1218 unsigned NumWords = llvm::APInt::getNumWords(BitWidth);
1220 return llvm::APInt(BitWidth, NumWords, pVal);
1222 return llvm::APInt(BitWidth, VAL);
1224 void setIntValue(ASTContext &C, const llvm::APInt &Val);
1227 class APIntStorage : private APNumericStorage {
1229 llvm::APInt getValue() const { return getIntValue(); }
1230 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); }
1233 class APFloatStorage : private APNumericStorage {
1235 llvm::APFloat getValue(const llvm::fltSemantics &Semantics) const {
1236 return llvm::APFloat(Semantics, getIntValue());
1238 void setValue(ASTContext &C, const llvm::APFloat &Val) {
1239 setIntValue(C, Val.bitcastToAPInt());
1243 class IntegerLiteral : public Expr, public APIntStorage {
1246 /// \brief Construct an empty integer literal.
1247 explicit IntegerLiteral(EmptyShell Empty)
1248 : Expr(IntegerLiteralClass, Empty) { }
1251 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy,
1252 // or UnsignedLongLongTy
1253 IntegerLiteral(ASTContext &C, const llvm::APInt &V, QualType type,
1256 /// \brief Returns a new integer literal with value 'V' and type 'type'.
1257 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy,
1258 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V
1259 /// \param V - the value that the returned integer literal contains.
1260 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V,
1261 QualType type, SourceLocation l);
1262 /// \brief Returns a new empty integer literal.
1263 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty);
1265 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
1266 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
1268 /// \brief Retrieve the location of the literal.
1269 SourceLocation getLocation() const { return Loc; }
1271 void setLocation(SourceLocation Location) { Loc = Location; }
1273 static bool classof(const Stmt *T) {
1274 return T->getStmtClass() == IntegerLiteralClass;
1278 child_range children() { return child_range(); }
1281 class CharacterLiteral : public Expr {
1283 enum CharacterKind {
1294 // type should be IntTy
1295 CharacterLiteral(unsigned value, CharacterKind kind, QualType type,
1297 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false,
1299 Value(value), Loc(l) {
1300 CharacterLiteralBits.Kind = kind;
1303 /// \brief Construct an empty character literal.
1304 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { }
1306 SourceLocation getLocation() const { return Loc; }
1307 CharacterKind getKind() const {
1308 return static_cast<CharacterKind>(CharacterLiteralBits.Kind);
1311 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
1312 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
1314 unsigned getValue() const { return Value; }
1316 void setLocation(SourceLocation Location) { Loc = Location; }
1317 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; }
1318 void setValue(unsigned Val) { Value = Val; }
1320 static bool classof(const Stmt *T) {
1321 return T->getStmtClass() == CharacterLiteralClass;
1325 child_range children() { return child_range(); }
1328 class FloatingLiteral : public Expr, private APFloatStorage {
1331 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact,
1332 QualType Type, SourceLocation L);
1334 /// \brief Construct an empty floating-point literal.
1335 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty);
1338 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V,
1339 bool isexact, QualType Type, SourceLocation L);
1340 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty);
1342 llvm::APFloat getValue() const {
1343 return APFloatStorage::getValue(getSemantics());
1345 void setValue(ASTContext &C, const llvm::APFloat &Val) {
1346 assert(&getSemantics() == &Val.getSemantics() && "Inconsistent semantics");
1347 APFloatStorage::setValue(C, Val);
1350 /// Get a raw enumeration value representing the floating-point semantics of
1351 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation.
1352 APFloatSemantics getRawSemantics() const {
1353 return static_cast<APFloatSemantics>(FloatingLiteralBits.Semantics);
1356 /// Set the raw enumeration value representing the floating-point semantics of
1357 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation.
1358 void setRawSemantics(APFloatSemantics Sem) {
1359 FloatingLiteralBits.Semantics = Sem;
1362 /// Return the APFloat semantics this literal uses.
1363 const llvm::fltSemantics &getSemantics() const;
1365 /// Set the APFloat semantics this literal uses.
1366 void setSemantics(const llvm::fltSemantics &Sem);
1368 bool isExact() const { return FloatingLiteralBits.IsExact; }
1369 void setExact(bool E) { FloatingLiteralBits.IsExact = E; }
1371 /// getValueAsApproximateDouble - This returns the value as an inaccurate
1372 /// double. Note that this may cause loss of precision, but is useful for
1373 /// debugging dumps, etc.
1374 double getValueAsApproximateDouble() const;
1376 SourceLocation getLocation() const { return Loc; }
1377 void setLocation(SourceLocation L) { Loc = L; }
1379 SourceLocation getLocStart() const LLVM_READONLY { return Loc; }
1380 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; }
1382 static bool classof(const Stmt *T) {
1383 return T->getStmtClass() == FloatingLiteralClass;
1387 child_range children() { return child_range(); }
1390 /// ImaginaryLiteral - We support imaginary integer and floating point literals,
1391 /// like "1.0i". We represent these as a wrapper around FloatingLiteral and
1392 /// IntegerLiteral classes. Instances of this class always have a Complex type
1393 /// whose element type matches the subexpression.
1395 class ImaginaryLiteral : public Expr {
1398 ImaginaryLiteral(Expr *val, QualType Ty)
1399 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false,
1403 /// \brief Build an empty imaginary literal.
1404 explicit ImaginaryLiteral(EmptyShell Empty)
1405 : Expr(ImaginaryLiteralClass, Empty) { }
1407 const Expr *getSubExpr() const { return cast<Expr>(Val); }
1408 Expr *getSubExpr() { return cast<Expr>(Val); }
1409 void setSubExpr(Expr *E) { Val = E; }
1411 SourceLocation getLocStart() const LLVM_READONLY { return Val->getLocStart(); }
1412 SourceLocation getLocEnd() const LLVM_READONLY { return Val->getLocEnd(); }
1414 static bool classof(const Stmt *T) {
1415 return T->getStmtClass() == ImaginaryLiteralClass;
1419 child_range children() { return child_range(&Val, &Val+1); }
1422 /// StringLiteral - This represents a string literal expression, e.g. "foo"
1423 /// or L"bar" (wide strings). The actual string is returned by getStrData()
1424 /// is NOT null-terminated, and the length of the string is determined by
1425 /// calling getByteLength(). The C type for a string is always a
1426 /// ConstantArrayType. In C++, the char type is const qualified, in C it is
1429 /// Note that strings in C can be formed by concatenation of multiple string
1430 /// literal pptokens in translation phase #6. This keeps track of the locations
1431 /// of each of these pieces.
1433 /// Strings in C can also be truncated and extended by assigning into arrays,
1434 /// e.g. with constructs like:
1435 /// char X[2] = "foobar";
1436 /// In this case, getByteLength() will return 6, but the string literal will
1437 /// have type "char[2]".
1438 class StringLiteral : public Expr {
1449 friend class ASTStmtReader;
1453 const uint16_t *asUInt16;
1454 const uint32_t *asUInt32;
1457 unsigned CharByteWidth : 4;
1459 unsigned IsPascal : 1;
1460 unsigned NumConcatenated;
1461 SourceLocation TokLocs[1];
1463 StringLiteral(QualType Ty) :
1464 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false,
1467 static int mapCharByteWidth(TargetInfo const &target,StringKind k);
1470 /// This is the "fully general" constructor that allows representation of
1471 /// strings formed from multiple concatenated tokens.
1472 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind,
1473 bool Pascal, QualType Ty,
1474 const SourceLocation *Loc, unsigned NumStrs);
1476 /// Simple constructor for string literals made from one token.
1477 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind,
1478 bool Pascal, QualType Ty,
1479 SourceLocation Loc) {
1480 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1);
1483 /// \brief Construct an empty string literal.
1484 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs);
1486 StringRef getString() const {
1487 assert(CharByteWidth==1
1488 && "This function is used in places that assume strings use char");
1489 return StringRef(StrData.asChar, getByteLength());
1492 /// Allow access to clients that need the byte representation, such as
1493 /// ASTWriterStmt::VisitStringLiteral().
1494 StringRef getBytes() const {
1495 // FIXME: StringRef may not be the right type to use as a result for this.
1496 if (CharByteWidth == 1)
1497 return StringRef(StrData.asChar, getByteLength());
1498 if (CharByteWidth == 4)
1499 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32),
1501 assert(CharByteWidth == 2 && "unsupported CharByteWidth");
1502 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16),
1506 void outputString(raw_ostream &OS) const;
1508 uint32_t getCodeUnit(size_t i) const {
1509 assert(i < Length && "out of bounds access");
1510 if (CharByteWidth == 1)
1511 return static_cast<unsigned char>(StrData.asChar[i]);
1512 if (CharByteWidth == 4)
1513 return StrData.asUInt32[i];
1514 assert(CharByteWidth == 2 && "unsupported CharByteWidth");
1515 return StrData.asUInt16[i];
1518 unsigned getByteLength() const { return CharByteWidth*Length; }
1519 unsigned getLength() const { return Length; }
1520 unsigned getCharByteWidth() const { return CharByteWidth; }
1522 /// \brief Sets the string data to the given string data.
1523 void setString(ASTContext &C, StringRef Str,
1524 StringKind Kind, bool IsPascal);
1526 StringKind getKind() const { return static_cast<StringKind>(Kind); }
1529 bool isAscii() const { return Kind == Ascii; }
1530 bool isWide() const { return Kind == Wide; }
1531 bool isUTF8() const { return Kind == UTF8; }
1532 bool isUTF16() const { return Kind == UTF16; }
1533 bool isUTF32() const { return Kind == UTF32; }
1534 bool isPascal() const { return IsPascal; }
1536 bool containsNonAsciiOrNull() const {
1537 StringRef Str = getString();
1538 for (unsigned i = 0, e = Str.size(); i != e; ++i)
1539 if (!isASCII(Str[i]) || !Str[i])
1544 /// getNumConcatenated - Get the number of string literal tokens that were
1545 /// concatenated in translation phase #6 to form this string literal.
1546 unsigned getNumConcatenated() const { return NumConcatenated; }
1548 SourceLocation getStrTokenLoc(unsigned TokNum) const {
1549 assert(TokNum < NumConcatenated && "Invalid tok number");
1550 return TokLocs[TokNum];
1552 void setStrTokenLoc(unsigned TokNum, SourceLocation L) {
1553 assert(TokNum < NumConcatenated && "Invalid tok number");
1554 TokLocs[TokNum] = L;
1557 /// getLocationOfByte - Return a source location that points to the specified
1558 /// byte of this string literal.
1560 /// Strings are amazingly complex. They can be formed from multiple tokens
1561 /// and can have escape sequences in them in addition to the usual trigraph
1562 /// and escaped newline business. This routine handles this complexity.
1564 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
1565 const LangOptions &Features,
1566 const TargetInfo &Target) const;
1568 typedef const SourceLocation *tokloc_iterator;
1569 tokloc_iterator tokloc_begin() const { return TokLocs; }
1570 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; }
1572 SourceLocation getLocStart() const LLVM_READONLY { return TokLocs[0]; }
1573 SourceLocation getLocEnd() const LLVM_READONLY {
1574 return TokLocs[NumConcatenated - 1];
1577 static bool classof(const Stmt *T) {
1578 return T->getStmtClass() == StringLiteralClass;
1582 child_range children() { return child_range(); }
1585 /// ParenExpr - This represents a parethesized expression, e.g. "(1)". This
1586 /// AST node is only formed if full location information is requested.
1587 class ParenExpr : public Expr {
1588 SourceLocation L, R;
1591 ParenExpr(SourceLocation l, SourceLocation r, Expr *val)
1592 : Expr(ParenExprClass, val->getType(),
1593 val->getValueKind(), val->getObjectKind(),
1594 val->isTypeDependent(), val->isValueDependent(),
1595 val->isInstantiationDependent(),
1596 val->containsUnexpandedParameterPack()),
1597 L(l), R(r), Val(val) {}
1599 /// \brief Construct an empty parenthesized expression.
1600 explicit ParenExpr(EmptyShell Empty)
1601 : Expr(ParenExprClass, Empty) { }
1603 const Expr *getSubExpr() const { return cast<Expr>(Val); }
1604 Expr *getSubExpr() { return cast<Expr>(Val); }
1605 void setSubExpr(Expr *E) { Val = E; }
1607 SourceLocation getLocStart() const LLVM_READONLY { return L; }
1608 SourceLocation getLocEnd() const LLVM_READONLY { return R; }
1610 /// \brief Get the location of the left parentheses '('.
1611 SourceLocation getLParen() const { return L; }
1612 void setLParen(SourceLocation Loc) { L = Loc; }
1614 /// \brief Get the location of the right parentheses ')'.
1615 SourceLocation getRParen() const { return R; }
1616 void setRParen(SourceLocation Loc) { R = Loc; }
1618 static bool classof(const Stmt *T) {
1619 return T->getStmtClass() == ParenExprClass;
1623 child_range children() { return child_range(&Val, &Val+1); }
1627 /// UnaryOperator - This represents the unary-expression's (except sizeof and
1628 /// alignof), the postinc/postdec operators from postfix-expression, and various
1631 /// Notes on various nodes:
1633 /// Real/Imag - These return the real/imag part of a complex operand. If
1634 /// applied to a non-complex value, the former returns its operand and the
1635 /// later returns zero in the type of the operand.
1637 class UnaryOperator : public Expr {
1639 typedef UnaryOperatorKind Opcode;
1647 UnaryOperator(Expr *input, Opcode opc, QualType type,
1648 ExprValueKind VK, ExprObjectKind OK, SourceLocation l)
1649 : Expr(UnaryOperatorClass, type, VK, OK,
1650 input->isTypeDependent() || type->isDependentType(),
1651 input->isValueDependent(),
1652 (input->isInstantiationDependent() ||
1653 type->isInstantiationDependentType()),
1654 input->containsUnexpandedParameterPack()),
1655 Opc(opc), Loc(l), Val(input) {}
1657 /// \brief Build an empty unary operator.
1658 explicit UnaryOperator(EmptyShell Empty)
1659 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { }
1661 Opcode getOpcode() const { return static_cast<Opcode>(Opc); }
1662 void setOpcode(Opcode O) { Opc = O; }
1664 Expr *getSubExpr() const { return cast<Expr>(Val); }
1665 void setSubExpr(Expr *E) { Val = E; }
1667 /// getOperatorLoc - Return the location of the operator.
1668 SourceLocation getOperatorLoc() const { return Loc; }
1669 void setOperatorLoc(SourceLocation L) { Loc = L; }
1671 /// isPostfix - Return true if this is a postfix operation, like x++.
1672 static bool isPostfix(Opcode Op) {
1673 return Op == UO_PostInc || Op == UO_PostDec;
1676 /// isPrefix - Return true if this is a prefix operation, like --x.
1677 static bool isPrefix(Opcode Op) {
1678 return Op == UO_PreInc || Op == UO_PreDec;
1681 bool isPrefix() const { return isPrefix(getOpcode()); }
1682 bool isPostfix() const { return isPostfix(getOpcode()); }
1684 static bool isIncrementOp(Opcode Op) {
1685 return Op == UO_PreInc || Op == UO_PostInc;
1687 bool isIncrementOp() const {
1688 return isIncrementOp(getOpcode());
1691 static bool isDecrementOp(Opcode Op) {
1692 return Op == UO_PreDec || Op == UO_PostDec;
1694 bool isDecrementOp() const {
1695 return isDecrementOp(getOpcode());
1698 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; }
1699 bool isIncrementDecrementOp() const {
1700 return isIncrementDecrementOp(getOpcode());
1703 static bool isArithmeticOp(Opcode Op) {
1704 return Op >= UO_Plus && Op <= UO_LNot;
1706 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); }
1708 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1709 /// corresponds to, e.g. "sizeof" or "[pre]++"
1710 static StringRef getOpcodeStr(Opcode Op);
1712 /// \brief Retrieve the unary opcode that corresponds to the given
1713 /// overloaded operator.
1714 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix);
1716 /// \brief Retrieve the overloaded operator kind that corresponds to
1717 /// the given unary opcode.
1718 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc);
1720 SourceLocation getLocStart() const LLVM_READONLY {
1721 return isPostfix() ? Val->getLocStart() : Loc;
1723 SourceLocation getLocEnd() const LLVM_READONLY {
1724 return isPostfix() ? Loc : Val->getLocEnd();
1726 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; }
1728 static bool classof(const Stmt *T) {
1729 return T->getStmtClass() == UnaryOperatorClass;
1733 child_range children() { return child_range(&Val, &Val+1); }
1736 /// OffsetOfExpr - [C99 7.17] - This represents an expression of the form
1737 /// offsetof(record-type, member-designator). For example, given:
1748 /// we can represent and evaluate the expression @c offsetof(struct T, s[2].d).
1750 class OffsetOfExpr : public Expr {
1752 // __builtin_offsetof(type, identifier(.identifier|[expr])*)
1753 class OffsetOfNode {
1755 /// \brief The kind of offsetof node we have.
1757 /// \brief An index into an array.
1761 /// \brief A field in a dependent type, known only by its name.
1763 /// \brief An implicit indirection through a C++ base class, when the
1764 /// field found is in a base class.
1769 enum { MaskBits = 2, Mask = 0x03 };
1771 /// \brief The source range that covers this part of the designator.
1774 /// \brief The data describing the designator, which comes in three
1775 /// different forms, depending on the lower two bits.
1776 /// - An unsigned index into the array of Expr*'s stored after this node
1777 /// in memory, for [constant-expression] designators.
1778 /// - A FieldDecl*, for references to a known field.
1779 /// - An IdentifierInfo*, for references to a field with a given name
1780 /// when the class type is dependent.
1781 /// - A CXXBaseSpecifier*, for references that look at a field in a
1786 /// \brief Create an offsetof node that refers to an array element.
1787 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index,
1788 SourceLocation RBracketLoc)
1789 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { }
1791 /// \brief Create an offsetof node that refers to a field.
1792 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field,
1793 SourceLocation NameLoc)
1794 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc),
1795 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { }
1797 /// \brief Create an offsetof node that refers to an identifier.
1798 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name,
1799 SourceLocation NameLoc)
1800 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc),
1801 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { }
1803 /// \brief Create an offsetof node that refers into a C++ base class.
1804 explicit OffsetOfNode(const CXXBaseSpecifier *Base)
1805 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {}
1807 /// \brief Determine what kind of offsetof node this is.
1808 Kind getKind() const {
1809 return static_cast<Kind>(Data & Mask);
1812 /// \brief For an array element node, returns the index into the array
1814 unsigned getArrayExprIndex() const {
1815 assert(getKind() == Array);
1819 /// \brief For a field offsetof node, returns the field.
1820 FieldDecl *getField() const {
1821 assert(getKind() == Field);
1822 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask);
1825 /// \brief For a field or identifier offsetof node, returns the name of
1827 IdentifierInfo *getFieldName() const;
1829 /// \brief For a base class node, returns the base specifier.
1830 CXXBaseSpecifier *getBase() const {
1831 assert(getKind() == Base);
1832 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask);
1835 /// \brief Retrieve the source range that covers this offsetof node.
1837 /// For an array element node, the source range contains the locations of
1838 /// the square brackets. For a field or identifier node, the source range
1839 /// contains the location of the period (if there is one) and the
1841 SourceRange getSourceRange() const LLVM_READONLY { return Range; }
1842 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); }
1843 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); }
1848 SourceLocation OperatorLoc, RParenLoc;
1850 TypeSourceInfo *TSInfo;
1851 // Number of sub-components (i.e. instances of OffsetOfNode).
1853 // Number of sub-expressions (i.e. array subscript expressions).
1856 OffsetOfExpr(ASTContext &C, QualType type,
1857 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
1858 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs,
1859 SourceLocation RParenLoc);
1861 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs)
1862 : Expr(OffsetOfExprClass, EmptyShell()),
1863 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {}
1867 static OffsetOfExpr *Create(ASTContext &C, QualType type,
1868 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
1869 ArrayRef<OffsetOfNode> comps,
1870 ArrayRef<Expr*> exprs, SourceLocation RParenLoc);
1872 static OffsetOfExpr *CreateEmpty(ASTContext &C,
1873 unsigned NumComps, unsigned NumExprs);
1875 /// getOperatorLoc - Return the location of the operator.
1876 SourceLocation getOperatorLoc() const { return OperatorLoc; }
1877 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; }
1879 /// \brief Return the location of the right parentheses.
1880 SourceLocation getRParenLoc() const { return RParenLoc; }
1881 void setRParenLoc(SourceLocation R) { RParenLoc = R; }
1883 TypeSourceInfo *getTypeSourceInfo() const {
1886 void setTypeSourceInfo(TypeSourceInfo *tsi) {
1890 const OffsetOfNode &getComponent(unsigned Idx) const {
1891 assert(Idx < NumComps && "Subscript out of range");
1892 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx];
1895 void setComponent(unsigned Idx, OffsetOfNode ON) {
1896 assert(Idx < NumComps && "Subscript out of range");
1897 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON;
1900 unsigned getNumComponents() const {
1904 Expr* getIndexExpr(unsigned Idx) {
1905 assert(Idx < NumExprs && "Subscript out of range");
1906 return reinterpret_cast<Expr **>(
1907 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx];
1909 const Expr *getIndexExpr(unsigned Idx) const {
1910 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx);
1913 void setIndexExpr(unsigned Idx, Expr* E) {
1914 assert(Idx < NumComps && "Subscript out of range");
1915 reinterpret_cast<Expr **>(
1916 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E;
1919 unsigned getNumExpressions() const {
1923 SourceLocation getLocStart() const LLVM_READONLY { return OperatorLoc; }
1924 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
1926 static bool classof(const Stmt *T) {
1927 return T->getStmtClass() == OffsetOfExprClass;
1931 child_range children() {
1933 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1)
1935 return child_range(begin, begin + NumExprs);
1939 /// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated)
1940 /// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and
1941 /// vec_step (OpenCL 1.1 6.11.12).
1942 class UnaryExprOrTypeTraitExpr : public Expr {
1947 SourceLocation OpLoc, RParenLoc;
1950 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo,
1951 QualType resultType, SourceLocation op,
1952 SourceLocation rp) :
1953 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary,
1954 false, // Never type-dependent (C++ [temp.dep.expr]p3).
1955 // Value-dependent if the argument is type-dependent.
1956 TInfo->getType()->isDependentType(),
1957 TInfo->getType()->isInstantiationDependentType(),
1958 TInfo->getType()->containsUnexpandedParameterPack()),
1959 OpLoc(op), RParenLoc(rp) {
1960 UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
1961 UnaryExprOrTypeTraitExprBits.IsType = true;
1962 Argument.Ty = TInfo;
1965 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E,
1966 QualType resultType, SourceLocation op,
1967 SourceLocation rp) :
1968 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary,
1969 false, // Never type-dependent (C++ [temp.dep.expr]p3).
1970 // Value-dependent if the argument is type-dependent.
1971 E->isTypeDependent(),
1972 E->isInstantiationDependent(),
1973 E->containsUnexpandedParameterPack()),
1974 OpLoc(op), RParenLoc(rp) {
1975 UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
1976 UnaryExprOrTypeTraitExprBits.IsType = false;
1980 /// \brief Construct an empty sizeof/alignof expression.
1981 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty)
1982 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { }
1984 UnaryExprOrTypeTrait getKind() const {
1985 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind);
1987 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;}
1989 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; }
1990 QualType getArgumentType() const {
1991 return getArgumentTypeInfo()->getType();
1993 TypeSourceInfo *getArgumentTypeInfo() const {
1994 assert(isArgumentType() && "calling getArgumentType() when arg is expr");
1997 Expr *getArgumentExpr() {
1998 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type");
1999 return static_cast<Expr*>(Argument.Ex);
2001 const Expr *getArgumentExpr() const {
2002 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr();
2005 void setArgument(Expr *E) {
2007 UnaryExprOrTypeTraitExprBits.IsType = false;
2009 void setArgument(TypeSourceInfo *TInfo) {
2010 Argument.Ty = TInfo;
2011 UnaryExprOrTypeTraitExprBits.IsType = true;
2014 /// Gets the argument type, or the type of the argument expression, whichever
2016 QualType getTypeOfArgument() const {
2017 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType();
2020 SourceLocation getOperatorLoc() const { return OpLoc; }
2021 void setOperatorLoc(SourceLocation L) { OpLoc = L; }
2023 SourceLocation getRParenLoc() const { return RParenLoc; }
2024 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
2026 SourceLocation getLocStart() const LLVM_READONLY { return OpLoc; }
2027 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
2029 static bool classof(const Stmt *T) {
2030 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass;
2034 child_range children();
2037 //===----------------------------------------------------------------------===//
2038 // Postfix Operators.
2039 //===----------------------------------------------------------------------===//
2041 /// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting.
2042 class ArraySubscriptExpr : public Expr {
2043 enum { LHS, RHS, END_EXPR=2 };
2044 Stmt* SubExprs[END_EXPR];
2045 SourceLocation RBracketLoc;
2047 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t,
2048 ExprValueKind VK, ExprObjectKind OK,
2049 SourceLocation rbracketloc)
2050 : Expr(ArraySubscriptExprClass, t, VK, OK,
2051 lhs->isTypeDependent() || rhs->isTypeDependent(),
2052 lhs->isValueDependent() || rhs->isValueDependent(),
2053 (lhs->isInstantiationDependent() ||
2054 rhs->isInstantiationDependent()),
2055 (lhs->containsUnexpandedParameterPack() ||
2056 rhs->containsUnexpandedParameterPack())),
2057 RBracketLoc(rbracketloc) {
2058 SubExprs[LHS] = lhs;
2059 SubExprs[RHS] = rhs;
2062 /// \brief Create an empty array subscript expression.
2063 explicit ArraySubscriptExpr(EmptyShell Shell)
2064 : Expr(ArraySubscriptExprClass, Shell) { }
2066 /// An array access can be written A[4] or 4[A] (both are equivalent).
2067 /// - getBase() and getIdx() always present the normalized view: A[4].
2068 /// In this case getBase() returns "A" and getIdx() returns "4".
2069 /// - getLHS() and getRHS() present the syntactic view. e.g. for
2070 /// 4[A] getLHS() returns "4".
2071 /// Note: Because vector element access is also written A[4] we must
2072 /// predicate the format conversion in getBase and getIdx only on the
2073 /// the type of the RHS, as it is possible for the LHS to be a vector of
2075 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); }
2076 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
2077 void setLHS(Expr *E) { SubExprs[LHS] = E; }
2079 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); }
2080 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
2081 void setRHS(Expr *E) { SubExprs[RHS] = E; }
2084 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS());
2087 const Expr *getBase() const {
2088 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS());
2092 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS());
2095 const Expr *getIdx() const {
2096 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS());
2099 SourceLocation getLocStart() const LLVM_READONLY {
2100 return getLHS()->getLocStart();
2102 SourceLocation getLocEnd() const LLVM_READONLY { return RBracketLoc; }
2104 SourceLocation getRBracketLoc() const { return RBracketLoc; }
2105 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; }
2107 SourceLocation getExprLoc() const LLVM_READONLY {
2108 return getBase()->getExprLoc();
2111 static bool classof(const Stmt *T) {
2112 return T->getStmtClass() == ArraySubscriptExprClass;
2116 child_range children() {
2117 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
2122 /// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
2123 /// CallExpr itself represents a normal function call, e.g., "f(x, 2)",
2124 /// while its subclasses may represent alternative syntax that (semantically)
2125 /// results in a function call. For example, CXXOperatorCallExpr is
2126 /// a subclass for overloaded operator calls that use operator syntax, e.g.,
2127 /// "str1 + str2" to resolve to a function call.
2128 class CallExpr : public Expr {
2129 enum { FN=0, PREARGS_START=1 };
2132 SourceLocation RParenLoc;
2135 // These versions of the constructor are for derived classes.
2136 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs,
2137 ArrayRef<Expr*> args, QualType t, ExprValueKind VK,
2138 SourceLocation rparenloc);
2139 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty);
2141 Stmt *getPreArg(unsigned i) {
2142 assert(i < getNumPreArgs() && "Prearg access out of range!");
2143 return SubExprs[PREARGS_START+i];
2145 const Stmt *getPreArg(unsigned i) const {
2146 assert(i < getNumPreArgs() && "Prearg access out of range!");
2147 return SubExprs[PREARGS_START+i];
2149 void setPreArg(unsigned i, Stmt *PreArg) {
2150 assert(i < getNumPreArgs() && "Prearg access out of range!");
2151 SubExprs[PREARGS_START+i] = PreArg;
2154 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; }
2157 CallExpr(ASTContext& C, Expr *fn, ArrayRef<Expr*> args, QualType t,
2158 ExprValueKind VK, SourceLocation rparenloc);
2160 /// \brief Build an empty call expression.
2161 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty);
2163 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); }
2164 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); }
2165 void setCallee(Expr *F) { SubExprs[FN] = F; }
2167 Decl *getCalleeDecl();
2168 const Decl *getCalleeDecl() const {
2169 return const_cast<CallExpr*>(this)->getCalleeDecl();
2172 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0.
2173 FunctionDecl *getDirectCallee();
2174 const FunctionDecl *getDirectCallee() const {
2175 return const_cast<CallExpr*>(this)->getDirectCallee();
2178 /// getNumArgs - Return the number of actual arguments to this call.
2180 unsigned getNumArgs() const { return NumArgs; }
2182 /// \brief Retrieve the call arguments.
2184 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START);
2186 const Expr *const *getArgs() const {
2187 return const_cast<CallExpr*>(this)->getArgs();
2190 /// getArg - Return the specified argument.
2191 Expr *getArg(unsigned Arg) {
2192 assert(Arg < NumArgs && "Arg access out of range!");
2193 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]);
2195 const Expr *getArg(unsigned Arg) const {
2196 assert(Arg < NumArgs && "Arg access out of range!");
2197 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]);
2200 /// setArg - Set the specified argument.
2201 void setArg(unsigned Arg, Expr *ArgExpr) {
2202 assert(Arg < NumArgs && "Arg access out of range!");
2203 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr;
2206 /// setNumArgs - This changes the number of arguments present in this call.
2207 /// Any orphaned expressions are deleted by this, and any new operands are set
2209 void setNumArgs(ASTContext& C, unsigned NumArgs);
2211 typedef ExprIterator arg_iterator;
2212 typedef ConstExprIterator const_arg_iterator;
2214 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); }
2215 arg_iterator arg_end() {
2216 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs();
2218 const_arg_iterator arg_begin() const {
2219 return SubExprs+PREARGS_START+getNumPreArgs();
2221 const_arg_iterator arg_end() const {
2222 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs();
2225 /// This method provides fast access to all the subexpressions of
2226 /// a CallExpr without going through the slower virtual child_iterator
2227 /// interface. This provides efficient reverse iteration of the
2228 /// subexpressions. This is currently used for CFG construction.
2229 ArrayRef<Stmt*> getRawSubExprs() {
2230 return ArrayRef<Stmt*>(SubExprs,
2231 getNumPreArgs() + PREARGS_START + getNumArgs());
2234 /// getNumCommas - Return the number of commas that must have been present in
2235 /// this function call.
2236 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; }
2238 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If
2240 unsigned isBuiltinCall() const;
2242 /// \brief Returns \c true if this is a call to a builtin which does not
2243 /// evaluate side-effects within its arguments.
2244 bool isUnevaluatedBuiltinCall(ASTContext &Ctx) const;
2246 /// getCallReturnType - Get the return type of the call expr. This is not
2247 /// always the type of the expr itself, if the return type is a reference
2249 QualType getCallReturnType() const;
2251 SourceLocation getRParenLoc() const { return RParenLoc; }
2252 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
2254 SourceLocation getLocStart() const LLVM_READONLY;
2255 SourceLocation getLocEnd() const LLVM_READONLY;
2257 static bool classof(const Stmt *T) {
2258 return T->getStmtClass() >= firstCallExprConstant &&
2259 T->getStmtClass() <= lastCallExprConstant;
2263 child_range children() {
2264 return child_range(&SubExprs[0],
2265 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START);
2269 /// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F.
2271 class MemberExpr : public Expr {
2272 /// Extra data stored in some member expressions.
2273 struct MemberNameQualifier {
2274 /// \brief The nested-name-specifier that qualifies the name, including
2275 /// source-location information.
2276 NestedNameSpecifierLoc QualifierLoc;
2278 /// \brief The DeclAccessPair through which the MemberDecl was found due to
2279 /// name qualifiers.
2280 DeclAccessPair FoundDecl;
2283 /// Base - the expression for the base pointer or structure references. In
2284 /// X.F, this is "X".
2287 /// MemberDecl - This is the decl being referenced by the field/member name.
2288 /// In X.F, this is the decl referenced by F.
2289 ValueDecl *MemberDecl;
2291 /// MemberDNLoc - Provides source/type location info for the
2292 /// declaration name embedded in MemberDecl.
2293 DeclarationNameLoc MemberDNLoc;
2295 /// MemberLoc - This is the location of the member name.
2296 SourceLocation MemberLoc;
2298 /// IsArrow - True if this is "X->F", false if this is "X.F".
2301 /// \brief True if this member expression used a nested-name-specifier to
2302 /// refer to the member, e.g., "x->Base::f", or found its member via a using
2303 /// declaration. When true, a MemberNameQualifier
2304 /// structure is allocated immediately after the MemberExpr.
2305 bool HasQualifierOrFoundDecl : 1;
2307 /// \brief True if this member expression specified a template keyword
2308 /// and/or a template argument list explicitly, e.g., x->f<int>,
2309 /// x->template f, x->template f<int>.
2310 /// When true, an ASTTemplateKWAndArgsInfo structure and its
2311 /// TemplateArguments (if any) are allocated immediately after
2312 /// the MemberExpr or, if the member expression also has a qualifier,
2313 /// after the MemberNameQualifier structure.
2314 bool HasTemplateKWAndArgsInfo : 1;
2316 /// \brief True if this member expression refers to a method that
2317 /// was resolved from an overloaded set having size greater than 1.
2318 bool HadMultipleCandidates : 1;
2320 /// \brief Retrieve the qualifier that preceded the member name, if any.
2321 MemberNameQualifier *getMemberQualifier() {
2322 assert(HasQualifierOrFoundDecl);
2323 return reinterpret_cast<MemberNameQualifier *> (this + 1);
2326 /// \brief Retrieve the qualifier that preceded the member name, if any.
2327 const MemberNameQualifier *getMemberQualifier() const {
2328 return const_cast<MemberExpr *>(this)->getMemberQualifier();
2332 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl,
2333 const DeclarationNameInfo &NameInfo, QualType ty,
2334 ExprValueKind VK, ExprObjectKind OK)
2335 : Expr(MemberExprClass, ty, VK, OK,
2336 base->isTypeDependent(),
2337 base->isValueDependent(),
2338 base->isInstantiationDependent(),
2339 base->containsUnexpandedParameterPack()),
2340 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()),
2341 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow),
2342 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false),
2343 HadMultipleCandidates(false) {
2344 assert(memberdecl->getDeclName() == NameInfo.getName());
2347 // NOTE: this constructor should be used only when it is known that
2348 // the member name can not provide additional syntactic info
2349 // (i.e., source locations for C++ operator names or type source info
2350 // for constructors, destructors and conversion operators).
2351 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl,
2352 SourceLocation l, QualType ty,
2353 ExprValueKind VK, ExprObjectKind OK)
2354 : Expr(MemberExprClass, ty, VK, OK,
2355 base->isTypeDependent(), base->isValueDependent(),
2356 base->isInstantiationDependent(),
2357 base->containsUnexpandedParameterPack()),
2358 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l),
2360 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false),
2361 HadMultipleCandidates(false) {}
2363 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow,
2364 NestedNameSpecifierLoc QualifierLoc,
2365 SourceLocation TemplateKWLoc,
2366 ValueDecl *memberdecl, DeclAccessPair founddecl,
2367 DeclarationNameInfo MemberNameInfo,
2368 const TemplateArgumentListInfo *targs,
2369 QualType ty, ExprValueKind VK, ExprObjectKind OK);
2371 void setBase(Expr *E) { Base = E; }
2372 Expr *getBase() const { return cast<Expr>(Base); }
2374 /// \brief Retrieve the member declaration to which this expression refers.
2376 /// The returned declaration will either be a FieldDecl or (in C++)
2377 /// a CXXMethodDecl.
2378 ValueDecl *getMemberDecl() const { return MemberDecl; }
2379 void setMemberDecl(ValueDecl *D) { MemberDecl = D; }
2381 /// \brief Retrieves the declaration found by lookup.
2382 DeclAccessPair getFoundDecl() const {
2383 if (!HasQualifierOrFoundDecl)
2384 return DeclAccessPair::make(getMemberDecl(),
2385 getMemberDecl()->getAccess());
2386 return getMemberQualifier()->FoundDecl;
2389 /// \brief Determines whether this member expression actually had
2390 /// a C++ nested-name-specifier prior to the name of the member, e.g.,
2392 bool hasQualifier() const { return getQualifier() != 0; }
2394 /// \brief If the member name was qualified, retrieves the
2395 /// nested-name-specifier that precedes the member name. Otherwise, returns
2397 NestedNameSpecifier *getQualifier() const {
2398 if (!HasQualifierOrFoundDecl)
2401 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier();
2404 /// \brief If the member name was qualified, retrieves the
2405 /// nested-name-specifier that precedes the member name, with source-location
2407 NestedNameSpecifierLoc getQualifierLoc() const {
2408 if (!hasQualifier())
2409 return NestedNameSpecifierLoc();
2411 return getMemberQualifier()->QualifierLoc;
2414 /// \brief Return the optional template keyword and arguments info.
2415 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() {
2416 if (!HasTemplateKWAndArgsInfo)
2419 if (!HasQualifierOrFoundDecl)
2420 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1);
2422 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(
2423 getMemberQualifier() + 1);
2426 /// \brief Return the optional template keyword and arguments info.
2427 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const {
2428 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo();
2431 /// \brief Retrieve the location of the template keyword preceding
2432 /// the member name, if any.
2433 SourceLocation getTemplateKeywordLoc() const {
2434 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2435 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc();
2438 /// \brief Retrieve the location of the left angle bracket starting the
2439 /// explicit template argument list following the member name, if any.
2440 SourceLocation getLAngleLoc() const {
2441 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2442 return getTemplateKWAndArgsInfo()->LAngleLoc;
2445 /// \brief Retrieve the location of the right angle bracket ending the
2446 /// explicit template argument list following the member name, if any.
2447 SourceLocation getRAngleLoc() const {
2448 if (!HasTemplateKWAndArgsInfo) return SourceLocation();
2449 return getTemplateKWAndArgsInfo()->RAngleLoc;
2452 /// Determines whether the member name was preceded by the template keyword.
2453 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }
2455 /// \brief Determines whether the member name was followed by an
2456 /// explicit template argument list.
2457 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }
2459 /// \brief Copies the template arguments (if present) into the given
2461 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
2462 if (hasExplicitTemplateArgs())
2463 getExplicitTemplateArgs().copyInto(List);
2466 /// \brief Retrieve the explicit template argument list that
2467 /// follow the member template name. This must only be called on an
2468 /// expression with explicit template arguments.
2469 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() {
2470 assert(hasExplicitTemplateArgs());
2471 return *getTemplateKWAndArgsInfo();
2474 /// \brief Retrieve the explicit template argument list that
2475 /// followed the member template name. This must only be called on
2476 /// an expression with explicit template arguments.
2477 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const {
2478 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs();
2481 /// \brief Retrieves the optional explicit template arguments.
2482 /// This points to the same data as getExplicitTemplateArgs(), but
2483 /// returns null if there are no explicit template arguments.
2484 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const {
2485 if (!hasExplicitTemplateArgs()) return 0;
2486 return &getExplicitTemplateArgs();
2489 /// \brief Retrieve the template arguments provided as part of this
2491 const TemplateArgumentLoc *getTemplateArgs() const {
2492 if (!hasExplicitTemplateArgs())
2495 return getExplicitTemplateArgs().getTemplateArgs();
2498 /// \brief Retrieve the number of template arguments provided as part of this
2500 unsigned getNumTemplateArgs() const {
2501 if (!hasExplicitTemplateArgs())
2504 return getExplicitTemplateArgs().NumTemplateArgs;
2507 /// \brief Retrieve the member declaration name info.
2508 DeclarationNameInfo getMemberNameInfo() const {
2509 return DeclarationNameInfo(MemberDecl->getDeclName(),
2510 MemberLoc, MemberDNLoc);
2513 bool isArrow() const { return IsArrow; }
2514 void setArrow(bool A) { IsArrow = A; }
2516 /// getMemberLoc - Return the location of the "member", in X->F, it is the
2517 /// location of 'F'.
2518 SourceLocation getMemberLoc() const { return MemberLoc; }
2519 void setMemberLoc(SourceLocation L) { MemberLoc = L; }
2521 SourceLocation getLocStart() const LLVM_READONLY;
2522 SourceLocation getLocEnd() const LLVM_READONLY;
2524 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; }
2526 /// \brief Determine whether the base of this explicit is implicit.
2527 bool isImplicitAccess() const {
2528 return getBase() && getBase()->isImplicitCXXThis();
2531 /// \brief Returns true if this member expression refers to a method that
2532 /// was resolved from an overloaded set having size greater than 1.
2533 bool hadMultipleCandidates() const {
2534 return HadMultipleCandidates;
2536 /// \brief Sets the flag telling whether this expression refers to
2537 /// a method that was resolved from an overloaded set having size
2539 void setHadMultipleCandidates(bool V = true) {
2540 HadMultipleCandidates = V;
2543 static bool classof(const Stmt *T) {
2544 return T->getStmtClass() == MemberExprClass;
2548 child_range children() { return child_range(&Base, &Base+1); }
2550 friend class ASTReader;
2551 friend class ASTStmtWriter;
2554 /// CompoundLiteralExpr - [C99 6.5.2.5]
2556 class CompoundLiteralExpr : public Expr {
2557 /// LParenLoc - If non-null, this is the location of the left paren in a
2558 /// compound literal like "(int){4}". This can be null if this is a
2559 /// synthesized compound expression.
2560 SourceLocation LParenLoc;
2562 /// The type as written. This can be an incomplete array type, in
2563 /// which case the actual expression type will be different.
2564 /// The int part of the pair stores whether this expr is file scope.
2565 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope;
2568 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo,
2569 QualType T, ExprValueKind VK, Expr *init, bool fileScope)
2570 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary,
2571 tinfo->getType()->isDependentType(),
2572 init->isValueDependent(),
2573 (init->isInstantiationDependent() ||
2574 tinfo->getType()->isInstantiationDependentType()),
2575 init->containsUnexpandedParameterPack()),
2576 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {}
2578 /// \brief Construct an empty compound literal.
2579 explicit CompoundLiteralExpr(EmptyShell Empty)
2580 : Expr(CompoundLiteralExprClass, Empty) { }
2582 const Expr *getInitializer() const { return cast<Expr>(Init); }
2583 Expr *getInitializer() { return cast<Expr>(Init); }
2584 void setInitializer(Expr *E) { Init = E; }
2586 bool isFileScope() const { return TInfoAndScope.getInt(); }
2587 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); }
2589 SourceLocation getLParenLoc() const { return LParenLoc; }
2590 void setLParenLoc(SourceLocation L) { LParenLoc = L; }
2592 TypeSourceInfo *getTypeSourceInfo() const {
2593 return TInfoAndScope.getPointer();
2595 void setTypeSourceInfo(TypeSourceInfo *tinfo) {
2596 TInfoAndScope.setPointer(tinfo);
2599 SourceLocation getLocStart() const LLVM_READONLY {
2600 // FIXME: Init should never be null.
2602 return SourceLocation();
2603 if (LParenLoc.isInvalid())
2604 return Init->getLocStart();
2607 SourceLocation getLocEnd() const LLVM_READONLY {
2608 // FIXME: Init should never be null.
2610 return SourceLocation();
2611 return Init->getLocEnd();
2614 static bool classof(const Stmt *T) {
2615 return T->getStmtClass() == CompoundLiteralExprClass;
2619 child_range children() { return child_range(&Init, &Init+1); }
2622 /// CastExpr - Base class for type casts, including both implicit
2623 /// casts (ImplicitCastExpr) and explicit casts that have some
2624 /// representation in the source code (ExplicitCastExpr's derived
2626 class CastExpr : public Expr {
2628 typedef clang::CastKind CastKind;
2633 void CheckCastConsistency() const;
2635 const CXXBaseSpecifier * const *path_buffer() const {
2636 return const_cast<CastExpr*>(this)->path_buffer();
2638 CXXBaseSpecifier **path_buffer();
2640 void setBasePathSize(unsigned basePathSize) {
2641 CastExprBits.BasePathSize = basePathSize;
2642 assert(CastExprBits.BasePathSize == basePathSize &&
2643 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!");
2647 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK,
2648 const CastKind kind, Expr *op, unsigned BasePathSize) :
2649 Expr(SC, ty, VK, OK_Ordinary,
2650 // Cast expressions are type-dependent if the type is
2651 // dependent (C++ [temp.dep.expr]p3).
2652 ty->isDependentType(),
2653 // Cast expressions are value-dependent if the type is
2654 // dependent or if the subexpression is value-dependent.
2655 ty->isDependentType() || (op && op->isValueDependent()),
2656 (ty->isInstantiationDependentType() ||
2657 (op && op->isInstantiationDependent())),
2658 (ty->containsUnexpandedParameterPack() ||
2659 (op && op->containsUnexpandedParameterPack()))),
2661 assert(kind != CK_Invalid && "creating cast with invalid cast kind");
2662 CastExprBits.Kind = kind;
2663 setBasePathSize(BasePathSize);
2665 CheckCastConsistency();
2669 /// \brief Construct an empty cast.
2670 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize)
2672 setBasePathSize(BasePathSize);
2676 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; }
2677 void setCastKind(CastKind K) { CastExprBits.Kind = K; }
2678 const char *getCastKindName() const;
2680 Expr *getSubExpr() { return cast<Expr>(Op); }
2681 const Expr *getSubExpr() const { return cast<Expr>(Op); }
2682 void setSubExpr(Expr *E) { Op = E; }
2684 /// \brief Retrieve the cast subexpression as it was written in the source
2685 /// code, looking through any implicit casts or other intermediate nodes
2686 /// introduced by semantic analysis.
2687 Expr *getSubExprAsWritten();
2688 const Expr *getSubExprAsWritten() const {
2689 return const_cast<CastExpr *>(this)->getSubExprAsWritten();
2692 typedef CXXBaseSpecifier **path_iterator;
2693 typedef const CXXBaseSpecifier * const *path_const_iterator;
2694 bool path_empty() const { return CastExprBits.BasePathSize == 0; }
2695 unsigned path_size() const { return CastExprBits.BasePathSize; }
2696 path_iterator path_begin() { return path_buffer(); }
2697 path_iterator path_end() { return path_buffer() + path_size(); }
2698 path_const_iterator path_begin() const { return path_buffer(); }
2699 path_const_iterator path_end() const { return path_buffer() + path_size(); }
2701 void setCastPath(const CXXCastPath &Path);
2703 static bool classof(const Stmt *T) {
2704 return T->getStmtClass() >= firstCastExprConstant &&
2705 T->getStmtClass() <= lastCastExprConstant;
2709 child_range children() { return child_range(&Op, &Op+1); }
2712 /// ImplicitCastExpr - Allows us to explicitly represent implicit type
2713 /// conversions, which have no direct representation in the original
2714 /// source code. For example: converting T[]->T*, void f()->void
2715 /// (*f)(), float->double, short->int, etc.
2717 /// In C, implicit casts always produce rvalues. However, in C++, an
2718 /// implicit cast whose result is being bound to a reference will be
2719 /// an lvalue or xvalue. For example:
2723 /// class Derived : public Base { };
2724 /// Derived &&ref();
2725 /// void f(Derived d) {
2726 /// Base& b = d; // initializer is an ImplicitCastExpr
2727 /// // to an lvalue of type Base
2728 /// Base&& r = ref(); // initializer is an ImplicitCastExpr
2729 /// // to an xvalue of type Base
2732 class ImplicitCastExpr : public CastExpr {
2734 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op,
2735 unsigned BasePathLength, ExprValueKind VK)
2736 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) {
2739 /// \brief Construct an empty implicit cast.
2740 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize)
2741 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { }
2744 enum OnStack_t { OnStack };
2745 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op,
2747 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) {
2750 static ImplicitCastExpr *Create(ASTContext &Context, QualType T,
2751 CastKind Kind, Expr *Operand,
2752 const CXXCastPath *BasePath,
2755 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize);
2757 SourceLocation getLocStart() const LLVM_READONLY {
2758 return getSubExpr()->getLocStart();
2760 SourceLocation getLocEnd() const LLVM_READONLY {
2761 return getSubExpr()->getLocEnd();
2764 static bool classof(const Stmt *T) {
2765 return T->getStmtClass() == ImplicitCastExprClass;
2769 inline Expr *Expr::IgnoreImpCasts() {
2771 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
2772 e = ice->getSubExpr();
2776 /// ExplicitCastExpr - An explicit cast written in the source
2779 /// This class is effectively an abstract class, because it provides
2780 /// the basic representation of an explicitly-written cast without
2781 /// specifying which kind of cast (C cast, functional cast, static
2782 /// cast, etc.) was written; specific derived classes represent the
2783 /// particular style of cast and its location information.
2785 /// Unlike implicit casts, explicit cast nodes have two different
2786 /// types: the type that was written into the source code, and the
2787 /// actual type of the expression as determined by semantic
2788 /// analysis. These types may differ slightly. For example, in C++ one
2789 /// can cast to a reference type, which indicates that the resulting
2790 /// expression will be an lvalue or xvalue. The reference type, however,
2791 /// will not be used as the type of the expression.
2792 class ExplicitCastExpr : public CastExpr {
2793 /// TInfo - Source type info for the (written) type
2794 /// this expression is casting to.
2795 TypeSourceInfo *TInfo;
2798 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK,
2799 CastKind kind, Expr *op, unsigned PathSize,
2800 TypeSourceInfo *writtenTy)
2801 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {}
2803 /// \brief Construct an empty explicit cast.
2804 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize)
2805 : CastExpr(SC, Shell, PathSize) { }
2808 /// getTypeInfoAsWritten - Returns the type source info for the type
2809 /// that this expression is casting to.
2810 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; }
2811 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; }
2813 /// getTypeAsWritten - Returns the type that this expression is
2814 /// casting to, as written in the source code.
2815 QualType getTypeAsWritten() const { return TInfo->getType(); }
2817 static bool classof(const Stmt *T) {
2818 return T->getStmtClass() >= firstExplicitCastExprConstant &&
2819 T->getStmtClass() <= lastExplicitCastExprConstant;
2823 /// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style
2824 /// cast in C++ (C++ [expr.cast]), which uses the syntax
2825 /// (Type)expr. For example: @c (int)f.
2826 class CStyleCastExpr : public ExplicitCastExpr {
2827 SourceLocation LPLoc; // the location of the left paren
2828 SourceLocation RPLoc; // the location of the right paren
2830 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op,
2831 unsigned PathSize, TypeSourceInfo *writtenTy,
2832 SourceLocation l, SourceLocation r)
2833 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize,
2834 writtenTy), LPLoc(l), RPLoc(r) {}
2836 /// \brief Construct an empty C-style explicit cast.
2837 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize)
2838 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { }
2841 static CStyleCastExpr *Create(ASTContext &Context, QualType T,
2842 ExprValueKind VK, CastKind K,
2843 Expr *Op, const CXXCastPath *BasePath,
2844 TypeSourceInfo *WrittenTy, SourceLocation L,
2847 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize);
2849 SourceLocation getLParenLoc() const { return LPLoc; }
2850 void setLParenLoc(SourceLocation L) { LPLoc = L; }
2852 SourceLocation getRParenLoc() const { return RPLoc; }
2853 void setRParenLoc(SourceLocation L) { RPLoc = L; }
2855 SourceLocation getLocStart() const LLVM_READONLY { return LPLoc; }
2856 SourceLocation getLocEnd() const LLVM_READONLY {
2857 return getSubExpr()->getLocEnd();
2860 static bool classof(const Stmt *T) {
2861 return T->getStmtClass() == CStyleCastExprClass;
2865 /// \brief A builtin binary operation expression such as "x + y" or "x <= y".
2867 /// This expression node kind describes a builtin binary operation,
2868 /// such as "x + y" for integer values "x" and "y". The operands will
2869 /// already have been converted to appropriate types (e.g., by
2870 /// performing promotions or conversions).
2872 /// In C++, where operators may be overloaded, a different kind of
2873 /// expression node (CXXOperatorCallExpr) is used to express the
2874 /// invocation of an overloaded operator with operator syntax. Within
2875 /// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is
2876 /// used to store an expression "x + y" depends on the subexpressions
2877 /// for x and y. If neither x or y is type-dependent, and the "+"
2878 /// operator resolves to a built-in operation, BinaryOperator will be
2879 /// used to express the computation (x and y may still be
2880 /// value-dependent). If either x or y is type-dependent, or if the
2881 /// "+" resolves to an overloaded operator, CXXOperatorCallExpr will
2882 /// be used to express the computation.
2883 class BinaryOperator : public Expr {
2885 typedef BinaryOperatorKind Opcode;
2890 // Records the FP_CONTRACT pragma status at the point that this binary
2891 // operator was parsed. This bit is only meaningful for operations on
2892 // floating point types. For all other types it should default to
2894 unsigned FPContractable : 1;
2895 SourceLocation OpLoc;
2897 enum { LHS, RHS, END_EXPR };
2898 Stmt* SubExprs[END_EXPR];
2901 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy,
2902 ExprValueKind VK, ExprObjectKind OK,
2903 SourceLocation opLoc, bool fpContractable)
2904 : Expr(BinaryOperatorClass, ResTy, VK, OK,
2905 lhs->isTypeDependent() || rhs->isTypeDependent(),
2906 lhs->isValueDependent() || rhs->isValueDependent(),
2907 (lhs->isInstantiationDependent() ||
2908 rhs->isInstantiationDependent()),
2909 (lhs->containsUnexpandedParameterPack() ||
2910 rhs->containsUnexpandedParameterPack())),
2911 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) {
2912 SubExprs[LHS] = lhs;
2913 SubExprs[RHS] = rhs;
2914 assert(!isCompoundAssignmentOp() &&
2915 "Use CompoundAssignOperator for compound assignments");
2918 /// \brief Construct an empty binary operator.
2919 explicit BinaryOperator(EmptyShell Empty)
2920 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { }
2922 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; }
2923 SourceLocation getOperatorLoc() const { return OpLoc; }
2924 void setOperatorLoc(SourceLocation L) { OpLoc = L; }
2926 Opcode getOpcode() const { return static_cast<Opcode>(Opc); }
2927 void setOpcode(Opcode O) { Opc = O; }
2929 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
2930 void setLHS(Expr *E) { SubExprs[LHS] = E; }
2931 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
2932 void setRHS(Expr *E) { SubExprs[RHS] = E; }
2934 SourceLocation getLocStart() const LLVM_READONLY {
2935 return getLHS()->getLocStart();
2937 SourceLocation getLocEnd() const LLVM_READONLY {
2938 return getRHS()->getLocEnd();
2941 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
2942 /// corresponds to, e.g. "<<=".
2943 static StringRef getOpcodeStr(Opcode Op);
2945 StringRef getOpcodeStr() const { return getOpcodeStr(getOpcode()); }
2947 /// \brief Retrieve the binary opcode that corresponds to the given
2948 /// overloaded operator.
2949 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO);
2951 /// \brief Retrieve the overloaded operator kind that corresponds to
2952 /// the given binary opcode.
2953 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc);
2955 /// predicates to categorize the respective opcodes.
2956 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; }
2957 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; }
2958 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; }
2959 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); }
2960 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; }
2961 bool isShiftOp() const { return isShiftOp(getOpcode()); }
2963 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; }
2964 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); }
2966 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; }
2967 bool isRelationalOp() const { return isRelationalOp(getOpcode()); }
2969 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; }
2970 bool isEqualityOp() const { return isEqualityOp(getOpcode()); }
2972 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; }
2973 bool isComparisonOp() const { return isComparisonOp(getOpcode()); }
2975 static Opcode negateComparisonOp(Opcode Opc) {
2978 llvm_unreachable("Not a comparsion operator.");
2979 case BO_LT: return BO_GE;
2980 case BO_GT: return BO_LE;
2981 case BO_LE: return BO_GT;
2982 case BO_GE: return BO_LT;
2983 case BO_EQ: return BO_NE;
2984 case BO_NE: return BO_EQ;
2988 static Opcode reverseComparisonOp(Opcode Opc) {
2991 llvm_unreachable("Not a comparsion operator.");
2992 case BO_LT: return BO_GT;
2993 case BO_GT: return BO_LT;
2994 case BO_LE: return BO_GE;
2995 case BO_GE: return BO_LE;
3002 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; }
3003 bool isLogicalOp() const { return isLogicalOp(getOpcode()); }
3005 static bool isAssignmentOp(Opcode Opc) {
3006 return Opc >= BO_Assign && Opc <= BO_OrAssign;
3008 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); }
3010 static bool isCompoundAssignmentOp(Opcode Opc) {
3011 return Opc > BO_Assign && Opc <= BO_OrAssign;
3013 bool isCompoundAssignmentOp() const {
3014 return isCompoundAssignmentOp(getOpcode());
3016 static Opcode getOpForCompoundAssignment(Opcode Opc) {
3017 assert(isCompoundAssignmentOp(Opc));
3018 if (Opc >= BO_AndAssign)
3019 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And);
3021 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul);
3024 static bool isShiftAssignOp(Opcode Opc) {
3025 return Opc == BO_ShlAssign || Opc == BO_ShrAssign;
3027 bool isShiftAssignOp() const {
3028 return isShiftAssignOp(getOpcode());
3031 static bool classof(const Stmt *S) {
3032 return S->getStmtClass() >= firstBinaryOperatorConstant &&
3033 S->getStmtClass() <= lastBinaryOperatorConstant;
3037 child_range children() {
3038 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
3041 // Set the FP contractability status of this operator. Only meaningful for
3042 // operations on floating point types.
3043 void setFPContractable(bool FPC) { FPContractable = FPC; }
3045 // Get the FP contractability status of this operator. Only meaningful for
3046 // operations on floating point types.
3047 bool isFPContractable() const { return FPContractable; }
3050 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy,
3051 ExprValueKind VK, ExprObjectKind OK,
3052 SourceLocation opLoc, bool fpContractable, bool dead2)
3053 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK,
3054 lhs->isTypeDependent() || rhs->isTypeDependent(),
3055 lhs->isValueDependent() || rhs->isValueDependent(),
3056 (lhs->isInstantiationDependent() ||
3057 rhs->isInstantiationDependent()),
3058 (lhs->containsUnexpandedParameterPack() ||
3059 rhs->containsUnexpandedParameterPack())),
3060 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) {
3061 SubExprs[LHS] = lhs;
3062 SubExprs[RHS] = rhs;
3065 BinaryOperator(StmtClass SC, EmptyShell Empty)
3066 : Expr(SC, Empty), Opc(BO_MulAssign) { }
3069 /// CompoundAssignOperator - For compound assignments (e.g. +=), we keep
3070 /// track of the type the operation is performed in. Due to the semantics of
3071 /// these operators, the operands are promoted, the arithmetic performed, an
3072 /// implicit conversion back to the result type done, then the assignment takes
3073 /// place. This captures the intermediate type which the computation is done
3075 class CompoundAssignOperator : public BinaryOperator {
3076 QualType ComputationLHSType;
3077 QualType ComputationResultType;
3079 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType,
3080 ExprValueKind VK, ExprObjectKind OK,
3081 QualType CompLHSType, QualType CompResultType,
3082 SourceLocation OpLoc, bool fpContractable)
3083 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, fpContractable,
3085 ComputationLHSType(CompLHSType),
3086 ComputationResultType(CompResultType) {
3087 assert(isCompoundAssignmentOp() &&
3088 "Only should be used for compound assignments");
3091 /// \brief Build an empty compound assignment operator expression.
3092 explicit CompoundAssignOperator(EmptyShell Empty)
3093 : BinaryOperator(CompoundAssignOperatorClass, Empty) { }
3095 // The two computation types are the type the LHS is converted
3096 // to for the computation and the type of the result; the two are
3097 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr).
3098 QualType getComputationLHSType() const { return ComputationLHSType; }
3099 void setComputationLHSType(QualType T) { ComputationLHSType = T; }
3101 QualType getComputationResultType() const { return ComputationResultType; }
3102 void setComputationResultType(QualType T) { ComputationResultType = T; }
3104 static bool classof(const Stmt *S) {
3105 return S->getStmtClass() == CompoundAssignOperatorClass;
3109 /// AbstractConditionalOperator - An abstract base class for
3110 /// ConditionalOperator and BinaryConditionalOperator.
3111 class AbstractConditionalOperator : public Expr {
3112 SourceLocation QuestionLoc, ColonLoc;
3113 friend class ASTStmtReader;
3116 AbstractConditionalOperator(StmtClass SC, QualType T,
3117 ExprValueKind VK, ExprObjectKind OK,
3118 bool TD, bool VD, bool ID,
3119 bool ContainsUnexpandedParameterPack,
3120 SourceLocation qloc,
3121 SourceLocation cloc)
3122 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack),
3123 QuestionLoc(qloc), ColonLoc(cloc) {}
3125 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty)
3126 : Expr(SC, Empty) { }
3129 // getCond - Return the expression representing the condition for
3131 Expr *getCond() const;
3133 // getTrueExpr - Return the subexpression representing the value of
3134 // the expression if the condition evaluates to true.
3135 Expr *getTrueExpr() const;
3137 // getFalseExpr - Return the subexpression representing the value of
3138 // the expression if the condition evaluates to false. This is
3139 // the same as getRHS.
3140 Expr *getFalseExpr() const;
3142 SourceLocation getQuestionLoc() const { return QuestionLoc; }
3143 SourceLocation getColonLoc() const { return ColonLoc; }
3145 static bool classof(const Stmt *T) {
3146 return T->getStmtClass() == ConditionalOperatorClass ||
3147 T->getStmtClass() == BinaryConditionalOperatorClass;
3151 /// ConditionalOperator - The ?: ternary operator. The GNU "missing
3152 /// middle" extension is a BinaryConditionalOperator.
3153 class ConditionalOperator : public AbstractConditionalOperator {
3154 enum { COND, LHS, RHS, END_EXPR };
3155 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides.
3157 friend class ASTStmtReader;
3159 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs,
3160 SourceLocation CLoc, Expr *rhs,
3161 QualType t, ExprValueKind VK, ExprObjectKind OK)
3162 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK,
3163 // FIXME: the type of the conditional operator doesn't
3164 // depend on the type of the conditional, but the standard
3165 // seems to imply that it could. File a bug!
3166 (lhs->isTypeDependent() || rhs->isTypeDependent()),
3167 (cond->isValueDependent() || lhs->isValueDependent() ||
3168 rhs->isValueDependent()),
3169 (cond->isInstantiationDependent() ||
3170 lhs->isInstantiationDependent() ||
3171 rhs->isInstantiationDependent()),
3172 (cond->containsUnexpandedParameterPack() ||
3173 lhs->containsUnexpandedParameterPack() ||
3174 rhs->containsUnexpandedParameterPack()),
3176 SubExprs[COND] = cond;
3177 SubExprs[LHS] = lhs;
3178 SubExprs[RHS] = rhs;
3181 /// \brief Build an empty conditional operator.
3182 explicit ConditionalOperator(EmptyShell Empty)
3183 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { }
3185 // getCond - Return the expression representing the condition for
3187 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
3189 // getTrueExpr - Return the subexpression representing the value of
3190 // the expression if the condition evaluates to true.
3191 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); }
3193 // getFalseExpr - Return the subexpression representing the value of
3194 // the expression if the condition evaluates to false. This is
3195 // the same as getRHS.
3196 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); }
3198 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
3199 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
3201 SourceLocation getLocStart() const LLVM_READONLY {
3202 return getCond()->getLocStart();
3204 SourceLocation getLocEnd() const LLVM_READONLY {
3205 return getRHS()->getLocEnd();
3208 static bool classof(const Stmt *T) {
3209 return T->getStmtClass() == ConditionalOperatorClass;
3213 child_range children() {
3214 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
3218 /// BinaryConditionalOperator - The GNU extension to the conditional
3219 /// operator which allows the middle operand to be omitted.
3221 /// This is a different expression kind on the assumption that almost
3222 /// every client ends up needing to know that these are different.
3223 class BinaryConditionalOperator : public AbstractConditionalOperator {
3224 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS };
3226 /// - the common condition/left-hand-side expression, which will be
3227 /// evaluated as the opaque value
3228 /// - the condition, expressed in terms of the opaque value
3229 /// - the left-hand-side, expressed in terms of the opaque value
3230 /// - the right-hand-side
3231 Stmt *SubExprs[NUM_SUBEXPRS];
3232 OpaqueValueExpr *OpaqueValue;
3234 friend class ASTStmtReader;
3236 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue,
3237 Expr *cond, Expr *lhs, Expr *rhs,
3238 SourceLocation qloc, SourceLocation cloc,
3239 QualType t, ExprValueKind VK, ExprObjectKind OK)
3240 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK,
3241 (common->isTypeDependent() || rhs->isTypeDependent()),
3242 (common->isValueDependent() || rhs->isValueDependent()),
3243 (common->isInstantiationDependent() ||
3244 rhs->isInstantiationDependent()),
3245 (common->containsUnexpandedParameterPack() ||
3246 rhs->containsUnexpandedParameterPack()),
3248 OpaqueValue(opaqueValue) {
3249 SubExprs[COMMON] = common;
3250 SubExprs[COND] = cond;
3251 SubExprs[LHS] = lhs;
3252 SubExprs[RHS] = rhs;
3253 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value");
3256 /// \brief Build an empty conditional operator.
3257 explicit BinaryConditionalOperator(EmptyShell Empty)
3258 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { }
3260 /// \brief getCommon - Return the common expression, written to the
3261 /// left of the condition. The opaque value will be bound to the
3262 /// result of this expression.
3263 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); }
3265 /// \brief getOpaqueValue - Return the opaque value placeholder.
3266 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; }
3268 /// \brief getCond - Return the condition expression; this is defined
3269 /// in terms of the opaque value.
3270 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
3272 /// \brief getTrueExpr - Return the subexpression which will be
3273 /// evaluated if the condition evaluates to true; this is defined
3274 /// in terms of the opaque value.
3275 Expr *getTrueExpr() const {
3276 return cast<Expr>(SubExprs[LHS]);
3279 /// \brief getFalseExpr - Return the subexpression which will be
3280 /// evaluated if the condnition evaluates to false; this is
3281 /// defined in terms of the opaque value.
3282 Expr *getFalseExpr() const {
3283 return cast<Expr>(SubExprs[RHS]);
3286 SourceLocation getLocStart() const LLVM_READONLY {
3287 return getCommon()->getLocStart();
3289 SourceLocation getLocEnd() const LLVM_READONLY {
3290 return getFalseExpr()->getLocEnd();
3293 static bool classof(const Stmt *T) {
3294 return T->getStmtClass() == BinaryConditionalOperatorClass;
3298 child_range children() {
3299 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS);
3303 inline Expr *AbstractConditionalOperator::getCond() const {
3304 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
3305 return co->getCond();
3306 return cast<BinaryConditionalOperator>(this)->getCond();
3309 inline Expr *AbstractConditionalOperator::getTrueExpr() const {
3310 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
3311 return co->getTrueExpr();
3312 return cast<BinaryConditionalOperator>(this)->getTrueExpr();
3315 inline Expr *AbstractConditionalOperator::getFalseExpr() const {
3316 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
3317 return co->getFalseExpr();
3318 return cast<BinaryConditionalOperator>(this)->getFalseExpr();
3321 /// AddrLabelExpr - The GNU address of label extension, representing &&label.
3322 class AddrLabelExpr : public Expr {
3323 SourceLocation AmpAmpLoc, LabelLoc;
3326 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L,
3328 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false,
3330 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {}
3332 /// \brief Build an empty address of a label expression.
3333 explicit AddrLabelExpr(EmptyShell Empty)
3334 : Expr(AddrLabelExprClass, Empty) { }
3336 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; }
3337 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; }
3338 SourceLocation getLabelLoc() const { return LabelLoc; }
3339 void setLabelLoc(SourceLocation L) { LabelLoc = L; }
3341 SourceLocation getLocStart() const LLVM_READONLY { return AmpAmpLoc; }
3342 SourceLocation getLocEnd() const LLVM_READONLY { return LabelLoc; }
3344 LabelDecl *getLabel() const { return Label; }
3345 void setLabel(LabelDecl *L) { Label = L; }
3347 static bool classof(const Stmt *T) {
3348 return T->getStmtClass() == AddrLabelExprClass;
3352 child_range children() { return child_range(); }
3355 /// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
3356 /// The StmtExpr contains a single CompoundStmt node, which it evaluates and
3357 /// takes the value of the last subexpression.
3359 /// A StmtExpr is always an r-value; values "returned" out of a
3360 /// StmtExpr will be copied.
3361 class StmtExpr : public Expr {
3363 SourceLocation LParenLoc, RParenLoc;
3365 // FIXME: Does type-dependence need to be computed differently?
3366 // FIXME: Do we need to compute instantiation instantiation-dependence for
3367 // statements? (ugh!)
3368 StmtExpr(CompoundStmt *substmt, QualType T,
3369 SourceLocation lp, SourceLocation rp) :
3370 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary,
3371 T->isDependentType(), false, false, false),
3372 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { }
3374 /// \brief Build an empty statement expression.
3375 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { }
3377 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); }
3378 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); }
3379 void setSubStmt(CompoundStmt *S) { SubStmt = S; }
3381 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; }
3382 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3384 SourceLocation getLParenLoc() const { return LParenLoc; }
3385 void setLParenLoc(SourceLocation L) { LParenLoc = L; }
3386 SourceLocation getRParenLoc() const { return RParenLoc; }
3387 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
3389 static bool classof(const Stmt *T) {
3390 return T->getStmtClass() == StmtExprClass;
3394 child_range children() { return child_range(&SubStmt, &SubStmt+1); }
3398 /// ShuffleVectorExpr - clang-specific builtin-in function
3399 /// __builtin_shufflevector.
3400 /// This AST node represents a operator that does a constant
3401 /// shuffle, similar to LLVM's shufflevector instruction. It takes
3402 /// two vectors and a variable number of constant indices,
3403 /// and returns the appropriately shuffled vector.
3404 class ShuffleVectorExpr : public Expr {
3405 SourceLocation BuiltinLoc, RParenLoc;
3407 // SubExprs - the list of values passed to the __builtin_shufflevector
3408 // function. The first two are vectors, and the rest are constant
3409 // indices. The number of values in this list is always
3410 // 2+the number of indices in the vector type.
3415 ShuffleVectorExpr(ASTContext &C, ArrayRef<Expr*> args, QualType Type,
3416 SourceLocation BLoc, SourceLocation RP);
3418 /// \brief Build an empty vector-shuffle expression.
3419 explicit ShuffleVectorExpr(EmptyShell Empty)
3420 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { }
3422 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
3423 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }
3425 SourceLocation getRParenLoc() const { return RParenLoc; }
3426 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
3428 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
3429 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3431 static bool classof(const Stmt *T) {
3432 return T->getStmtClass() == ShuffleVectorExprClass;
3435 /// getNumSubExprs - Return the size of the SubExprs array. This includes the
3436 /// constant expression, the actual arguments passed in, and the function
3438 unsigned getNumSubExprs() const { return NumExprs; }
3440 /// \brief Retrieve the array of expressions.
3441 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); }
3443 /// getExpr - Return the Expr at the specified index.
3444 Expr *getExpr(unsigned Index) {
3445 assert((Index < NumExprs) && "Arg access out of range!");
3446 return cast<Expr>(SubExprs[Index]);
3448 const Expr *getExpr(unsigned Index) const {
3449 assert((Index < NumExprs) && "Arg access out of range!");
3450 return cast<Expr>(SubExprs[Index]);
3453 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs);
3455 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) const {
3456 assert((N < NumExprs - 2) && "Shuffle idx out of range!");
3457 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue();
3461 child_range children() {
3462 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs);
3466 /// ChooseExpr - GNU builtin-in function __builtin_choose_expr.
3467 /// This AST node is similar to the conditional operator (?:) in C, with
3468 /// the following exceptions:
3469 /// - the test expression must be a integer constant expression.
3470 /// - the expression returned acts like the chosen subexpression in every
3471 /// visible way: the type is the same as that of the chosen subexpression,
3472 /// and all predicates (whether it's an l-value, whether it's an integer
3473 /// constant expression, etc.) return the same result as for the chosen
3475 class ChooseExpr : public Expr {
3476 enum { COND, LHS, RHS, END_EXPR };
3477 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides.
3478 SourceLocation BuiltinLoc, RParenLoc;
3480 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs,
3481 QualType t, ExprValueKind VK, ExprObjectKind OK,
3482 SourceLocation RP, bool TypeDependent, bool ValueDependent)
3483 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent,
3484 (cond->isInstantiationDependent() ||
3485 lhs->isInstantiationDependent() ||
3486 rhs->isInstantiationDependent()),
3487 (cond->containsUnexpandedParameterPack() ||
3488 lhs->containsUnexpandedParameterPack() ||
3489 rhs->containsUnexpandedParameterPack())),
3490 BuiltinLoc(BLoc), RParenLoc(RP) {
3491 SubExprs[COND] = cond;
3492 SubExprs[LHS] = lhs;
3493 SubExprs[RHS] = rhs;
3496 /// \brief Build an empty __builtin_choose_expr.
3497 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { }
3499 /// isConditionTrue - Return whether the condition is true (i.e. not
3501 bool isConditionTrue(const ASTContext &C) const;
3503 /// getChosenSubExpr - Return the subexpression chosen according to the
3505 Expr *getChosenSubExpr(const ASTContext &C) const {
3506 return isConditionTrue(C) ? getLHS() : getRHS();
3509 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
3510 void setCond(Expr *E) { SubExprs[COND] = E; }
3511 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
3512 void setLHS(Expr *E) { SubExprs[LHS] = E; }
3513 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
3514 void setRHS(Expr *E) { SubExprs[RHS] = E; }
3516 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
3517 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }
3519 SourceLocation getRParenLoc() const { return RParenLoc; }
3520 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
3522 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
3523 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3525 static bool classof(const Stmt *T) {
3526 return T->getStmtClass() == ChooseExprClass;
3530 child_range children() {
3531 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
3535 /// GNUNullExpr - Implements the GNU __null extension, which is a name
3536 /// for a null pointer constant that has integral type (e.g., int or
3537 /// long) and is the same size and alignment as a pointer. The __null
3538 /// extension is typically only used by system headers, which define
3539 /// NULL as __null in C++ rather than using 0 (which is an integer
3540 /// that may not match the size of a pointer).
3541 class GNUNullExpr : public Expr {
3542 /// TokenLoc - The location of the __null keyword.
3543 SourceLocation TokenLoc;
3546 GNUNullExpr(QualType Ty, SourceLocation Loc)
3547 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false,
3551 /// \brief Build an empty GNU __null expression.
3552 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { }
3554 /// getTokenLocation - The location of the __null token.
3555 SourceLocation getTokenLocation() const { return TokenLoc; }
3556 void setTokenLocation(SourceLocation L) { TokenLoc = L; }
3558 SourceLocation getLocStart() const LLVM_READONLY { return TokenLoc; }
3559 SourceLocation getLocEnd() const LLVM_READONLY { return TokenLoc; }
3561 static bool classof(const Stmt *T) {
3562 return T->getStmtClass() == GNUNullExprClass;
3566 child_range children() { return child_range(); }
3569 /// VAArgExpr, used for the builtin function __builtin_va_arg.
3570 class VAArgExpr : public Expr {
3572 TypeSourceInfo *TInfo;
3573 SourceLocation BuiltinLoc, RParenLoc;
3575 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo,
3576 SourceLocation RPLoc, QualType t)
3577 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary,
3578 t->isDependentType(), false,
3579 (TInfo->getType()->isInstantiationDependentType() ||
3580 e->isInstantiationDependent()),
3581 (TInfo->getType()->containsUnexpandedParameterPack() ||
3582 e->containsUnexpandedParameterPack())),
3583 Val(e), TInfo(TInfo),
3585 RParenLoc(RPLoc) { }
3587 /// \brief Create an empty __builtin_va_arg expression.
3588 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { }
3590 const Expr *getSubExpr() const { return cast<Expr>(Val); }
3591 Expr *getSubExpr() { return cast<Expr>(Val); }
3592 void setSubExpr(Expr *E) { Val = E; }
3594 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; }
3595 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; }
3597 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
3598 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }
3600 SourceLocation getRParenLoc() const { return RParenLoc; }
3601 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
3603 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
3604 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
3606 static bool classof(const Stmt *T) {
3607 return T->getStmtClass() == VAArgExprClass;
3611 child_range children() { return child_range(&Val, &Val+1); }
3614 /// @brief Describes an C or C++ initializer list.
3616 /// InitListExpr describes an initializer list, which can be used to
3617 /// initialize objects of different types, including
3618 /// struct/class/union types, arrays, and vectors. For example:
3621 /// struct foo x = { 1, { 2, 3 } };
3624 /// Prior to semantic analysis, an initializer list will represent the
3625 /// initializer list as written by the user, but will have the
3626 /// placeholder type "void". This initializer list is called the
3627 /// syntactic form of the initializer, and may contain C99 designated
3628 /// initializers (represented as DesignatedInitExprs), initializations
3629 /// of subobject members without explicit braces, and so on. Clients
3630 /// interested in the original syntax of the initializer list should
3631 /// use the syntactic form of the initializer list.
3633 /// After semantic analysis, the initializer list will represent the
3634 /// semantic form of the initializer, where the initializations of all
3635 /// subobjects are made explicit with nested InitListExpr nodes and
3636 /// C99 designators have been eliminated by placing the designated
3637 /// initializations into the subobject they initialize. Additionally,
3638 /// any "holes" in the initialization, where no initializer has been
3639 /// specified for a particular subobject, will be replaced with
3640 /// implicitly-generated ImplicitValueInitExpr expressions that
3641 /// value-initialize the subobjects. Note, however, that the
3642 /// initializer lists may still have fewer initializers than there are
3643 /// elements to initialize within the object.
3645 /// After semantic analysis has completed, given an initializer list,
3646 /// method isSemanticForm() returns true if and only if this is the
3647 /// semantic form of the initializer list (note: the same AST node
3648 /// may at the same time be the syntactic form).
3649 /// Given the semantic form of the initializer list, one can retrieve
3650 /// the syntactic form of that initializer list (when different)
3651 /// using method getSyntacticForm(); the method returns null if applied
3652 /// to a initializer list which is already in syntactic form.
3653 /// Similarly, given the syntactic form (i.e., an initializer list such
3654 /// that isSemanticForm() returns false), one can retrieve the semantic
3655 /// form using method getSemanticForm().
3656 /// Since many initializer lists have the same syntactic and semantic forms,
3657 /// getSyntacticForm() may return NULL, indicating that the current
3658 /// semantic initializer list also serves as its syntactic form.
3659 class InitListExpr : public Expr {
3660 // FIXME: Eliminate this vector in favor of ASTContext allocation
3661 typedef ASTVector<Stmt *> InitExprsTy;
3662 InitExprsTy InitExprs;
3663 SourceLocation LBraceLoc, RBraceLoc;
3665 /// The alternative form of the initializer list (if it exists).
3666 /// The int part of the pair stores whether this initalizer list is
3667 /// in semantic form. If not null, the pointer points to:
3668 /// - the syntactic form, if this is in semantic form;
3669 /// - the semantic form, if this is in syntactic form.
3670 llvm::PointerIntPair<InitListExpr *, 1, bool> AltForm;
3673 /// If this initializer list initializes an array with more elements than
3674 /// there are initializers in the list, specifies an expression to be used
3675 /// for value initialization of the rest of the elements.
3677 /// If this initializer list initializes a union, specifies which
3678 /// field within the union will be initialized.
3679 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit;
3682 InitListExpr(ASTContext &C, SourceLocation lbraceloc,
3683 ArrayRef<Expr*> initExprs, SourceLocation rbraceloc);
3685 /// \brief Build an empty initializer list.
3686 explicit InitListExpr(EmptyShell Empty)
3687 : Expr(InitListExprClass, Empty) { }
3689 unsigned getNumInits() const { return InitExprs.size(); }
3691 /// \brief Retrieve the set of initializers.
3692 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); }
3694 const Expr *getInit(unsigned Init) const {
3695 assert(Init < getNumInits() && "Initializer access out of range!");
3696 return cast_or_null<Expr>(InitExprs[Init]);
3699 Expr *getInit(unsigned Init) {
3700 assert(Init < getNumInits() && "Initializer access out of range!");
3701 return cast_or_null<Expr>(InitExprs[Init]);
3704 void setInit(unsigned Init, Expr *expr) {
3705 assert(Init < getNumInits() && "Initializer access out of range!");
3706 InitExprs[Init] = expr;
3709 /// \brief Reserve space for some number of initializers.
3710 void reserveInits(ASTContext &C, unsigned NumInits);
3712 /// @brief Specify the number of initializers
3714 /// If there are more than @p NumInits initializers, the remaining
3715 /// initializers will be destroyed. If there are fewer than @p
3716 /// NumInits initializers, NULL expressions will be added for the
3717 /// unknown initializers.
3718 void resizeInits(ASTContext &Context, unsigned NumInits);
3720 /// @brief Updates the initializer at index @p Init with the new
3721 /// expression @p expr, and returns the old expression at that
3724 /// When @p Init is out of range for this initializer list, the
3725 /// initializer list will be extended with NULL expressions to
3726 /// accommodate the new entry.
3727 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr);
3729 /// \brief If this initializer list initializes an array with more elements
3730 /// than there are initializers in the list, specifies an expression to be
3731 /// used for value initialization of the rest of the elements.
3732 Expr *getArrayFiller() {
3733 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>();
3735 const Expr *getArrayFiller() const {
3736 return const_cast<InitListExpr *>(this)->getArrayFiller();
3738 void setArrayFiller(Expr *filler);
3740 /// \brief Return true if this is an array initializer and its array "filler"
3742 bool hasArrayFiller() const { return getArrayFiller(); }
3744 /// \brief If this initializes a union, specifies which field in the
3745 /// union to initialize.
3747 /// Typically, this field is the first named field within the
3748 /// union. However, a designated initializer can specify the
3749 /// initialization of a different field within the union.
3750 FieldDecl *getInitializedFieldInUnion() {
3751 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>();
3753 const FieldDecl *getInitializedFieldInUnion() const {
3754 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion();
3756 void setInitializedFieldInUnion(FieldDecl *FD) {
3757 ArrayFillerOrUnionFieldInit = FD;
3760 // Explicit InitListExpr's originate from source code (and have valid source
3761 // locations). Implicit InitListExpr's are created by the semantic analyzer.
3763 return LBraceLoc.isValid() && RBraceLoc.isValid();
3766 // Is this an initializer for an array of characters, initialized by a string
3767 // literal or an @encode?
3768 bool isStringLiteralInit() const;
3770 SourceLocation getLBraceLoc() const { return LBraceLoc; }
3771 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; }
3772 SourceLocation getRBraceLoc() const { return RBraceLoc; }
3773 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; }
3775 bool isSemanticForm() const { return AltForm.getInt(); }
3776 InitListExpr *getSemanticForm() const {
3777 return isSemanticForm() ? 0 : AltForm.getPointer();
3779 InitListExpr *getSyntacticForm() const {
3780 return isSemanticForm() ? AltForm.getPointer() : 0;
3783 void setSyntacticForm(InitListExpr *Init) {
3784 AltForm.setPointer(Init);
3785 AltForm.setInt(true);
3786 Init->AltForm.setPointer(this);
3787 Init->AltForm.setInt(false);
3790 bool hadArrayRangeDesignator() const {
3791 return InitListExprBits.HadArrayRangeDesignator != 0;
3793 void sawArrayRangeDesignator(bool ARD = true) {
3794 InitListExprBits.HadArrayRangeDesignator = ARD;
3797 bool initializesStdInitializerList() const {
3798 return InitListExprBits.InitializesStdInitializerList != 0;
3800 void setInitializesStdInitializerList(bool ISIL = true) {
3801 InitListExprBits.InitializesStdInitializerList = ISIL;
3804 SourceLocation getLocStart() const LLVM_READONLY;
3805 SourceLocation getLocEnd() const LLVM_READONLY;
3807 static bool classof(const Stmt *T) {
3808 return T->getStmtClass() == InitListExprClass;
3812 child_range children() {
3813 if (InitExprs.empty()) return child_range();
3814 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size());
3817 typedef InitExprsTy::iterator iterator;
3818 typedef InitExprsTy::const_iterator const_iterator;
3819 typedef InitExprsTy::reverse_iterator reverse_iterator;
3820 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator;
3822 iterator begin() { return InitExprs.begin(); }
3823 const_iterator begin() const { return InitExprs.begin(); }
3824 iterator end() { return InitExprs.end(); }
3825 const_iterator end() const { return InitExprs.end(); }
3826 reverse_iterator rbegin() { return InitExprs.rbegin(); }
3827 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); }
3828 reverse_iterator rend() { return InitExprs.rend(); }
3829 const_reverse_iterator rend() const { return InitExprs.rend(); }
3831 friend class ASTStmtReader;
3832 friend class ASTStmtWriter;
3835 /// @brief Represents a C99 designated initializer expression.
3837 /// A designated initializer expression (C99 6.7.8) contains one or
3838 /// more designators (which can be field designators, array
3839 /// designators, or GNU array-range designators) followed by an
3840 /// expression that initializes the field or element(s) that the
3841 /// designators refer to. For example, given:
3848 /// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 };
3851 /// The InitListExpr contains three DesignatedInitExprs, the first of
3852 /// which covers @c [2].y=1.0. This DesignatedInitExpr will have two
3853 /// designators, one array designator for @c [2] followed by one field
3854 /// designator for @c .y. The initalization expression will be 1.0.
3855 class DesignatedInitExpr : public Expr {
3857 /// \brief Forward declaration of the Designator class.
3861 /// The location of the '=' or ':' prior to the actual initializer
3863 SourceLocation EqualOrColonLoc;
3865 /// Whether this designated initializer used the GNU deprecated
3866 /// syntax rather than the C99 '=' syntax.
3869 /// The number of designators in this initializer expression.
3870 unsigned NumDesignators : 15;
3872 /// The number of subexpressions of this initializer expression,
3873 /// which contains both the initializer and any additional
3874 /// expressions used by array and array-range designators.
3875 unsigned NumSubExprs : 16;
3877 /// \brief The designators in this designated initialization
3879 Designator *Designators;
3882 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators,
3883 const Designator *Designators,
3884 SourceLocation EqualOrColonLoc, bool GNUSyntax,
3885 ArrayRef<Expr*> IndexExprs, Expr *Init);
3887 explicit DesignatedInitExpr(unsigned NumSubExprs)
3888 : Expr(DesignatedInitExprClass, EmptyShell()),
3889 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { }
3892 /// A field designator, e.g., ".x".
3893 struct FieldDesignator {
3894 /// Refers to the field that is being initialized. The low bit
3895 /// of this field determines whether this is actually a pointer
3896 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When
3897 /// initially constructed, a field designator will store an
3898 /// IdentifierInfo*. After semantic analysis has resolved that
3899 /// name, the field designator will instead store a FieldDecl*.
3900 uintptr_t NameOrField;
3902 /// The location of the '.' in the designated initializer.
3905 /// The location of the field name in the designated initializer.
3909 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]".
3910 struct ArrayOrRangeDesignator {
3911 /// Location of the first index expression within the designated
3912 /// initializer expression's list of subexpressions.
3914 /// The location of the '[' starting the array range designator.
3915 unsigned LBracketLoc;
3916 /// The location of the ellipsis separating the start and end
3917 /// indices. Only valid for GNU array-range designators.
3918 unsigned EllipsisLoc;
3919 /// The location of the ']' terminating the array range designator.
3920 unsigned RBracketLoc;
3923 /// @brief Represents a single C99 designator.
3925 /// @todo This class is infuriatingly similar to clang::Designator,
3926 /// but minor differences (storing indices vs. storing pointers)
3927 /// keep us from reusing it. Try harder, later, to rectify these
3930 /// @brief The kind of designator this describes.
3934 ArrayRangeDesignator
3938 /// A field designator, e.g., ".x".
3939 struct FieldDesignator Field;
3940 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]".
3941 struct ArrayOrRangeDesignator ArrayOrRange;
3943 friend class DesignatedInitExpr;
3948 /// @brief Initializes a field designator.
3949 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc,
3950 SourceLocation FieldLoc)
3951 : Kind(FieldDesignator) {
3952 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01;
3953 Field.DotLoc = DotLoc.getRawEncoding();
3954 Field.FieldLoc = FieldLoc.getRawEncoding();
3957 /// @brief Initializes an array designator.
3958 Designator(unsigned Index, SourceLocation LBracketLoc,
3959 SourceLocation RBracketLoc)
3960 : Kind(ArrayDesignator) {
3961 ArrayOrRange.Index = Index;
3962 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding();
3963 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding();
3964 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding();
3967 /// @brief Initializes a GNU array-range designator.
3968 Designator(unsigned Index, SourceLocation LBracketLoc,
3969 SourceLocation EllipsisLoc, SourceLocation RBracketLoc)
3970 : Kind(ArrayRangeDesignator) {
3971 ArrayOrRange.Index = Index;
3972 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding();
3973 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding();
3974 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding();
3977 bool isFieldDesignator() const { return Kind == FieldDesignator; }
3978 bool isArrayDesignator() const { return Kind == ArrayDesignator; }
3979 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; }
3981 IdentifierInfo *getFieldName() const;
3983 FieldDecl *getField() const {
3984 assert(Kind == FieldDesignator && "Only valid on a field designator");
3985 if (Field.NameOrField & 0x01)
3988 return reinterpret_cast<FieldDecl *>(Field.NameOrField);
3991 void setField(FieldDecl *FD) {
3992 assert(Kind == FieldDesignator && "Only valid on a field designator");
3993 Field.NameOrField = reinterpret_cast<uintptr_t>(FD);
3996 SourceLocation getDotLoc() const {
3997 assert(Kind == FieldDesignator && "Only valid on a field designator");
3998 return SourceLocation::getFromRawEncoding(Field.DotLoc);
4001 SourceLocation getFieldLoc() const {
4002 assert(Kind == FieldDesignator && "Only valid on a field designator");
4003 return SourceLocation::getFromRawEncoding(Field.FieldLoc);
4006 SourceLocation getLBracketLoc() const {
4007 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
4008 "Only valid on an array or array-range designator");
4009 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc);
4012 SourceLocation getRBracketLoc() const {
4013 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
4014 "Only valid on an array or array-range designator");
4015 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc);
4018 SourceLocation getEllipsisLoc() const {
4019 assert(Kind == ArrayRangeDesignator &&
4020 "Only valid on an array-range designator");
4021 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc);
4024 unsigned getFirstExprIndex() const {
4025 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) &&
4026 "Only valid on an array or array-range designator");
4027 return ArrayOrRange.Index;
4030 SourceLocation getLocStart() const LLVM_READONLY {
4031 if (Kind == FieldDesignator)
4032 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc();
4034 return getLBracketLoc();
4036 SourceLocation getLocEnd() const LLVM_READONLY {
4037 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc();
4039 SourceRange getSourceRange() const LLVM_READONLY {
4040 return SourceRange(getLocStart(), getLocEnd());
4044 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators,
4045 unsigned NumDesignators,
4046 ArrayRef<Expr*> IndexExprs,
4047 SourceLocation EqualOrColonLoc,
4048 bool GNUSyntax, Expr *Init);
4050 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs);
4052 /// @brief Returns the number of designators in this initializer.
4053 unsigned size() const { return NumDesignators; }
4055 // Iterator access to the designators.
4056 typedef Designator *designators_iterator;
4057 designators_iterator designators_begin() { return Designators; }
4058 designators_iterator designators_end() {
4059 return Designators + NumDesignators;
4062 typedef const Designator *const_designators_iterator;
4063 const_designators_iterator designators_begin() const { return Designators; }
4064 const_designators_iterator designators_end() const {
4065 return Designators + NumDesignators;
4068 typedef std::reverse_iterator<designators_iterator>
4069 reverse_designators_iterator;
4070 reverse_designators_iterator designators_rbegin() {
4071 return reverse_designators_iterator(designators_end());
4073 reverse_designators_iterator designators_rend() {
4074 return reverse_designators_iterator(designators_begin());
4077 typedef std::reverse_iterator<const_designators_iterator>
4078 const_reverse_designators_iterator;
4079 const_reverse_designators_iterator designators_rbegin() const {
4080 return const_reverse_designators_iterator(designators_end());
4082 const_reverse_designators_iterator designators_rend() const {
4083 return const_reverse_designators_iterator(designators_begin());
4086 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; }
4088 void setDesignators(ASTContext &C, const Designator *Desigs,
4089 unsigned NumDesigs);
4091 Expr *getArrayIndex(const Designator &D) const;
4092 Expr *getArrayRangeStart(const Designator &D) const;
4093 Expr *getArrayRangeEnd(const Designator &D) const;
4095 /// @brief Retrieve the location of the '=' that precedes the
4096 /// initializer value itself, if present.
4097 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; }
4098 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; }
4100 /// @brief Determines whether this designated initializer used the
4101 /// deprecated GNU syntax for designated initializers.
4102 bool usesGNUSyntax() const { return GNUSyntax; }
4103 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; }
4105 /// @brief Retrieve the initializer value.
4106 Expr *getInit() const {
4107 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin());
4110 void setInit(Expr *init) {
4111 *child_begin() = init;
4114 /// \brief Retrieve the total number of subexpressions in this
4115 /// designated initializer expression, including the actual
4116 /// initialized value and any expressions that occur within array
4117 /// and array-range designators.
4118 unsigned getNumSubExprs() const { return NumSubExprs; }
4120 Expr *getSubExpr(unsigned Idx) {
4121 assert(Idx < NumSubExprs && "Subscript out of range");
4122 char* Ptr = static_cast<char*>(static_cast<void *>(this));
4123 Ptr += sizeof(DesignatedInitExpr);
4124 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx];
4127 void setSubExpr(unsigned Idx, Expr *E) {
4128 assert(Idx < NumSubExprs && "Subscript out of range");
4129 char* Ptr = static_cast<char*>(static_cast<void *>(this));
4130 Ptr += sizeof(DesignatedInitExpr);
4131 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E;
4134 /// \brief Replaces the designator at index @p Idx with the series
4135 /// of designators in [First, Last).
4136 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First,
4137 const Designator *Last);
4139 SourceRange getDesignatorsSourceRange() const;
4141 SourceLocation getLocStart() const LLVM_READONLY;
4142 SourceLocation getLocEnd() const LLVM_READONLY;
4144 static bool classof(const Stmt *T) {
4145 return T->getStmtClass() == DesignatedInitExprClass;
4149 child_range children() {
4150 Stmt **begin = reinterpret_cast<Stmt**>(this + 1);
4151 return child_range(begin, begin + NumSubExprs);
4155 /// \brief Represents an implicitly-generated value initialization of
4156 /// an object of a given type.
4158 /// Implicit value initializations occur within semantic initializer
4159 /// list expressions (InitListExpr) as placeholders for subobject
4160 /// initializations not explicitly specified by the user.
4162 /// \see InitListExpr
4163 class ImplicitValueInitExpr : public Expr {
4165 explicit ImplicitValueInitExpr(QualType ty)
4166 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary,
4167 false, false, ty->isInstantiationDependentType(), false) { }
4169 /// \brief Construct an empty implicit value initialization.
4170 explicit ImplicitValueInitExpr(EmptyShell Empty)
4171 : Expr(ImplicitValueInitExprClass, Empty) { }
4173 static bool classof(const Stmt *T) {
4174 return T->getStmtClass() == ImplicitValueInitExprClass;
4177 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); }
4178 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); }
4181 child_range children() { return child_range(); }
4185 class ParenListExpr : public Expr {
4188 SourceLocation LParenLoc, RParenLoc;
4191 ParenListExpr(ASTContext& C, SourceLocation lparenloc, ArrayRef<Expr*> exprs,
4192 SourceLocation rparenloc);
4194 /// \brief Build an empty paren list.
4195 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { }
4197 unsigned getNumExprs() const { return NumExprs; }
4199 const Expr* getExpr(unsigned Init) const {
4200 assert(Init < getNumExprs() && "Initializer access out of range!");
4201 return cast_or_null<Expr>(Exprs[Init]);
4204 Expr* getExpr(unsigned Init) {
4205 assert(Init < getNumExprs() && "Initializer access out of range!");
4206 return cast_or_null<Expr>(Exprs[Init]);
4209 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); }
4211 SourceLocation getLParenLoc() const { return LParenLoc; }
4212 SourceLocation getRParenLoc() const { return RParenLoc; }
4214 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; }
4215 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
4217 static bool classof(const Stmt *T) {
4218 return T->getStmtClass() == ParenListExprClass;
4222 child_range children() {
4223 return child_range(&Exprs[0], &Exprs[0]+NumExprs);
4226 friend class ASTStmtReader;
4227 friend class ASTStmtWriter;
4231 /// \brief Represents a C11 generic selection.
4233 /// A generic selection (C11 6.5.1.1) contains an unevaluated controlling
4234 /// expression, followed by one or more generic associations. Each generic
4235 /// association specifies a type name and an expression, or "default" and an
4236 /// expression (in which case it is known as a default generic association).
4237 /// The type and value of the generic selection are identical to those of its
4238 /// result expression, which is defined as the expression in the generic
4239 /// association with a type name that is compatible with the type of the
4240 /// controlling expression, or the expression in the default generic association
4241 /// if no types are compatible. For example:
4244 /// _Generic(X, double: 1, float: 2, default: 3)
4247 /// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f
4248 /// or 3 if "hello".
4250 /// As an extension, generic selections are allowed in C++, where the following
4251 /// additional semantics apply:
4253 /// Any generic selection whose controlling expression is type-dependent or
4254 /// which names a dependent type in its association list is result-dependent,
4255 /// which means that the choice of result expression is dependent.
4256 /// Result-dependent generic associations are both type- and value-dependent.
4257 class GenericSelectionExpr : public Expr {
4258 enum { CONTROLLING, END_EXPR };
4259 TypeSourceInfo **AssocTypes;
4261 unsigned NumAssocs, ResultIndex;
4262 SourceLocation GenericLoc, DefaultLoc, RParenLoc;
4265 GenericSelectionExpr(ASTContext &Context,
4266 SourceLocation GenericLoc, Expr *ControllingExpr,
4267 ArrayRef<TypeSourceInfo*> AssocTypes,
4268 ArrayRef<Expr*> AssocExprs,
4269 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4270 bool ContainsUnexpandedParameterPack,
4271 unsigned ResultIndex);
4273 /// This constructor is used in the result-dependent case.
4274 GenericSelectionExpr(ASTContext &Context,
4275 SourceLocation GenericLoc, Expr *ControllingExpr,
4276 ArrayRef<TypeSourceInfo*> AssocTypes,
4277 ArrayRef<Expr*> AssocExprs,
4278 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4279 bool ContainsUnexpandedParameterPack);
4281 explicit GenericSelectionExpr(EmptyShell Empty)
4282 : Expr(GenericSelectionExprClass, Empty) { }
4284 unsigned getNumAssocs() const { return NumAssocs; }
4286 SourceLocation getGenericLoc() const { return GenericLoc; }
4287 SourceLocation getDefaultLoc() const { return DefaultLoc; }
4288 SourceLocation getRParenLoc() const { return RParenLoc; }
4290 const Expr *getAssocExpr(unsigned i) const {
4291 return cast<Expr>(SubExprs[END_EXPR+i]);
4293 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); }
4295 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const {
4296 return AssocTypes[i];
4298 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; }
4300 QualType getAssocType(unsigned i) const {
4301 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i))
4302 return TS->getType();
4307 const Expr *getControllingExpr() const {
4308 return cast<Expr>(SubExprs[CONTROLLING]);
4310 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); }
4312 /// Whether this generic selection is result-dependent.
4313 bool isResultDependent() const { return ResultIndex == -1U; }
4315 /// The zero-based index of the result expression's generic association in
4316 /// the generic selection's association list. Defined only if the
4317 /// generic selection is not result-dependent.
4318 unsigned getResultIndex() const {
4319 assert(!isResultDependent() && "Generic selection is result-dependent");
4323 /// The generic selection's result expression. Defined only if the
4324 /// generic selection is not result-dependent.
4325 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); }
4326 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); }
4328 SourceLocation getLocStart() const LLVM_READONLY { return GenericLoc; }
4329 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
4331 static bool classof(const Stmt *T) {
4332 return T->getStmtClass() == GenericSelectionExprClass;
4335 child_range children() {
4336 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs);
4339 friend class ASTStmtReader;
4342 //===----------------------------------------------------------------------===//
4344 //===----------------------------------------------------------------------===//
4347 /// ExtVectorElementExpr - This represents access to specific elements of a
4348 /// vector, and may occur on the left hand side or right hand side. For example
4349 /// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector.
4351 /// Note that the base may have either vector or pointer to vector type, just
4352 /// like a struct field reference.
4354 class ExtVectorElementExpr : public Expr {
4356 IdentifierInfo *Accessor;
4357 SourceLocation AccessorLoc;
4359 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base,
4360 IdentifierInfo &accessor, SourceLocation loc)
4361 : Expr(ExtVectorElementExprClass, ty, VK,
4362 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent),
4363 base->isTypeDependent(), base->isValueDependent(),
4364 base->isInstantiationDependent(),
4365 base->containsUnexpandedParameterPack()),
4366 Base(base), Accessor(&accessor), AccessorLoc(loc) {}
4368 /// \brief Build an empty vector element expression.
4369 explicit ExtVectorElementExpr(EmptyShell Empty)
4370 : Expr(ExtVectorElementExprClass, Empty) { }
4372 const Expr *getBase() const { return cast<Expr>(Base); }
4373 Expr *getBase() { return cast<Expr>(Base); }
4374 void setBase(Expr *E) { Base = E; }
4376 IdentifierInfo &getAccessor() const { return *Accessor; }
4377 void setAccessor(IdentifierInfo *II) { Accessor = II; }
4379 SourceLocation getAccessorLoc() const { return AccessorLoc; }
4380 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; }
4382 /// getNumElements - Get the number of components being selected.
4383 unsigned getNumElements() const;
4385 /// containsDuplicateElements - Return true if any element access is
4387 bool containsDuplicateElements() const;
4389 /// getEncodedElementAccess - Encode the elements accessed into an llvm
4390 /// aggregate Constant of ConstantInt(s).
4391 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const;
4393 SourceLocation getLocStart() const LLVM_READONLY {
4394 return getBase()->getLocStart();
4396 SourceLocation getLocEnd() const LLVM_READONLY { return AccessorLoc; }
4398 /// isArrow - Return true if the base expression is a pointer to vector,
4399 /// return false if the base expression is a vector.
4400 bool isArrow() const;
4402 static bool classof(const Stmt *T) {
4403 return T->getStmtClass() == ExtVectorElementExprClass;
4407 child_range children() { return child_range(&Base, &Base+1); }
4411 /// BlockExpr - Adaptor class for mixing a BlockDecl with expressions.
4412 /// ^{ statement-body } or ^(int arg1, float arg2){ statement-body }
4413 class BlockExpr : public Expr {
4415 BlockDecl *TheBlock;
4417 BlockExpr(BlockDecl *BD, QualType ty)
4418 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary,
4419 ty->isDependentType(), ty->isDependentType(),
4420 ty->isInstantiationDependentType() || BD->isDependentContext(),
4424 /// \brief Build an empty block expression.
4425 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { }
4427 const BlockDecl *getBlockDecl() const { return TheBlock; }
4428 BlockDecl *getBlockDecl() { return TheBlock; }
4429 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; }
4431 // Convenience functions for probing the underlying BlockDecl.
4432 SourceLocation getCaretLocation() const;
4433 const Stmt *getBody() const;
4436 SourceLocation getLocStart() const LLVM_READONLY { return getCaretLocation(); }
4437 SourceLocation getLocEnd() const LLVM_READONLY { return getBody()->getLocEnd(); }
4439 /// getFunctionType - Return the underlying function type for this block.
4440 const FunctionProtoType *getFunctionType() const;
4442 static bool classof(const Stmt *T) {
4443 return T->getStmtClass() == BlockExprClass;
4447 child_range children() { return child_range(); }
4450 /// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2]
4451 /// This AST node provides support for reinterpreting a type to another
4452 /// type of the same size.
4453 class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr?
4456 SourceLocation BuiltinLoc, RParenLoc;
4458 friend class ASTReader;
4459 friend class ASTStmtReader;
4460 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {}
4463 AsTypeExpr(Expr* SrcExpr, QualType DstType,
4464 ExprValueKind VK, ExprObjectKind OK,
4465 SourceLocation BuiltinLoc, SourceLocation RParenLoc)
4466 : Expr(AsTypeExprClass, DstType, VK, OK,
4467 DstType->isDependentType(),
4468 DstType->isDependentType() || SrcExpr->isValueDependent(),
4469 (DstType->isInstantiationDependentType() ||
4470 SrcExpr->isInstantiationDependent()),
4471 (DstType->containsUnexpandedParameterPack() ||
4472 SrcExpr->containsUnexpandedParameterPack())),
4473 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {}
4475 /// getSrcExpr - Return the Expr to be converted.
4476 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); }
4478 /// getBuiltinLoc - Return the location of the __builtin_astype token.
4479 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
4481 /// getRParenLoc - Return the location of final right parenthesis.
4482 SourceLocation getRParenLoc() const { return RParenLoc; }
4484 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
4485 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
4487 static bool classof(const Stmt *T) {
4488 return T->getStmtClass() == AsTypeExprClass;
4492 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); }
4495 /// PseudoObjectExpr - An expression which accesses a pseudo-object
4496 /// l-value. A pseudo-object is an abstract object, accesses to which
4497 /// are translated to calls. The pseudo-object expression has a
4498 /// syntactic form, which shows how the expression was actually
4499 /// written in the source code, and a semantic form, which is a series
4500 /// of expressions to be executed in order which detail how the
4501 /// operation is actually evaluated. Optionally, one of the semantic
4502 /// forms may also provide a result value for the expression.
4504 /// If any of the semantic-form expressions is an OpaqueValueExpr,
4505 /// that OVE is required to have a source expression, and it is bound
4506 /// to the result of that source expression. Such OVEs may appear
4507 /// only in subsequent semantic-form expressions and as
4508 /// sub-expressions of the syntactic form.
4510 /// PseudoObjectExpr should be used only when an operation can be
4511 /// usefully described in terms of fairly simple rewrite rules on
4512 /// objects and functions that are meant to be used by end-developers.
4513 /// For example, under the Itanium ABI, dynamic casts are implemented
4514 /// as a call to a runtime function called __dynamic_cast; using this
4515 /// class to describe that would be inappropriate because that call is
4516 /// not really part of the user-visible semantics, and instead the
4517 /// cast is properly reflected in the AST and IR-generation has been
4518 /// taught to generate the call as necessary. In contrast, an
4519 /// Objective-C property access is semantically defined to be
4520 /// equivalent to a particular message send, and this is very much
4521 /// part of the user model. The name of this class encourages this
4522 /// modelling design.
4523 class PseudoObjectExpr : public Expr {
4524 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions.
4525 // Always at least two, because the first sub-expression is the
4528 // PseudoObjectExprBits.ResultIndex - The index of the
4529 // sub-expression holding the result. 0 means the result is void,
4530 // which is unambiguous because it's the index of the syntactic
4531 // form. Note that this is therefore 1 higher than the value passed
4532 // in to Create, which is an index within the semantic forms.
4533 // Note also that ASTStmtWriter assumes this encoding.
4535 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); }
4536 const Expr * const *getSubExprsBuffer() const {
4537 return reinterpret_cast<const Expr * const *>(this + 1);
4540 friend class ASTStmtReader;
4542 PseudoObjectExpr(QualType type, ExprValueKind VK,
4543 Expr *syntactic, ArrayRef<Expr*> semantic,
4544 unsigned resultIndex);
4546 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs);
4548 unsigned getNumSubExprs() const {
4549 return PseudoObjectExprBits.NumSubExprs;
4553 /// NoResult - A value for the result index indicating that there is
4554 /// no semantic result.
4555 enum { NoResult = ~0U };
4557 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic,
4558 ArrayRef<Expr*> semantic,
4559 unsigned resultIndex);
4561 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell,
4562 unsigned numSemanticExprs);
4564 /// Return the syntactic form of this expression, i.e. the
4565 /// expression it actually looks like. Likely to be expressed in
4566 /// terms of OpaqueValueExprs bound in the semantic form.
4567 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; }
4568 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; }
4570 /// Return the index of the result-bearing expression into the semantics
4571 /// expressions, or PseudoObjectExpr::NoResult if there is none.
4572 unsigned getResultExprIndex() const {
4573 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult;
4574 return PseudoObjectExprBits.ResultIndex - 1;
4577 /// Return the result-bearing expression, or null if there is none.
4578 Expr *getResultExpr() {
4579 if (PseudoObjectExprBits.ResultIndex == 0)
4581 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex];
4583 const Expr *getResultExpr() const {
4584 return const_cast<PseudoObjectExpr*>(this)->getResultExpr();
4587 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; }
4589 typedef Expr * const *semantics_iterator;
4590 typedef const Expr * const *const_semantics_iterator;
4591 semantics_iterator semantics_begin() {
4592 return getSubExprsBuffer() + 1;
4594 const_semantics_iterator semantics_begin() const {
4595 return getSubExprsBuffer() + 1;
4597 semantics_iterator semantics_end() {
4598 return getSubExprsBuffer() + getNumSubExprs();
4600 const_semantics_iterator semantics_end() const {
4601 return getSubExprsBuffer() + getNumSubExprs();
4603 Expr *getSemanticExpr(unsigned index) {
4604 assert(index + 1 < getNumSubExprs());
4605 return getSubExprsBuffer()[index + 1];
4607 const Expr *getSemanticExpr(unsigned index) const {
4608 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index);
4611 SourceLocation getExprLoc() const LLVM_READONLY {
4612 return getSyntacticForm()->getExprLoc();
4615 SourceLocation getLocStart() const LLVM_READONLY {
4616 return getSyntacticForm()->getLocStart();
4618 SourceLocation getLocEnd() const LLVM_READONLY {
4619 return getSyntacticForm()->getLocEnd();
4622 child_range children() {
4623 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer());
4624 return child_range(cs, cs + getNumSubExprs());
4627 static bool classof(const Stmt *T) {
4628 return T->getStmtClass() == PseudoObjectExprClass;
4632 /// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*,
4633 /// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the
4634 /// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>.
4635 /// All of these instructions take one primary pointer and at least one memory
4637 class AtomicExpr : public Expr {
4640 #define BUILTIN(ID, TYPE, ATTRS)
4641 #define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID,
4642 #include "clang/Basic/Builtins.def"
4643 // Avoid trailing comma
4648 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR };
4649 Stmt* SubExprs[END_EXPR];
4650 unsigned NumSubExprs;
4651 SourceLocation BuiltinLoc, RParenLoc;
4654 friend class ASTStmtReader;
4657 AtomicExpr(SourceLocation BLoc, ArrayRef<Expr*> args, QualType t,
4658 AtomicOp op, SourceLocation RP);
4660 /// \brief Determine the number of arguments the specified atomic builtin
4662 static unsigned getNumSubExprs(AtomicOp Op);
4664 /// \brief Build an empty AtomicExpr.
4665 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { }
4667 Expr *getPtr() const {
4668 return cast<Expr>(SubExprs[PTR]);
4670 Expr *getOrder() const {
4671 return cast<Expr>(SubExprs[ORDER]);
4673 Expr *getVal1() const {
4674 if (Op == AO__c11_atomic_init)
4675 return cast<Expr>(SubExprs[ORDER]);
4676 assert(NumSubExprs > VAL1);
4677 return cast<Expr>(SubExprs[VAL1]);
4679 Expr *getOrderFail() const {
4680 assert(NumSubExprs > ORDER_FAIL);
4681 return cast<Expr>(SubExprs[ORDER_FAIL]);
4683 Expr *getVal2() const {
4684 if (Op == AO__atomic_exchange)
4685 return cast<Expr>(SubExprs[ORDER_FAIL]);
4686 assert(NumSubExprs > VAL2);
4687 return cast<Expr>(SubExprs[VAL2]);
4689 Expr *getWeak() const {
4690 assert(NumSubExprs > WEAK);
4691 return cast<Expr>(SubExprs[WEAK]);
4694 AtomicOp getOp() const { return Op; }
4695 unsigned getNumSubExprs() { return NumSubExprs; }
4697 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); }
4699 bool isVolatile() const {
4700 return getPtr()->getType()->getPointeeType().isVolatileQualified();
4703 bool isCmpXChg() const {
4704 return getOp() == AO__c11_atomic_compare_exchange_strong ||
4705 getOp() == AO__c11_atomic_compare_exchange_weak ||
4706 getOp() == AO__atomic_compare_exchange ||
4707 getOp() == AO__atomic_compare_exchange_n;
4710 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
4711 SourceLocation getRParenLoc() const { return RParenLoc; }
4713 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; }
4714 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; }
4716 static bool classof(const Stmt *T) {
4717 return T->getStmtClass() == AtomicExprClass;
4721 child_range children() {
4722 return child_range(SubExprs, SubExprs+NumSubExprs);
4725 } // end namespace clang