Expr.h revision 65d78312ce026092cb6e7b1d4d06f05e18d02aa0
1324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver// 3324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver// The LLVM Compiler Infrastructure 4324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver// 5324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver// This file is distributed under the University of Illinois Open Source 6324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver// License. See LICENSE.TXT for details. 7324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver// 8324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver//===----------------------------------------------------------------------===// 9324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver// 10324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver// This file defines the Expr interface and subclasses. 11324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver// 12324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver//===----------------------------------------------------------------------===// 13324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 14324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#ifndef LLVM_CLANG_AST_EXPR_H 15324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#define LLVM_CLANG_AST_EXPR_H 16324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 17324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "clang/AST/APValue.h" 18324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "clang/AST/ASTVector.h" 19324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "clang/AST/Decl.h" 20324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "clang/AST/DeclAccessPair.h" 21324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "clang/AST/OperationKinds.h" 22324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "clang/AST/Stmt.h" 23324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "clang/AST/TemplateBase.h" 24324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "clang/AST/Type.h" 25324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "clang/Basic/TypeTraits.h" 26324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "llvm/ADT/APFloat.h" 27324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "llvm/ADT/APSInt.h" 28324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "llvm/ADT/SmallVector.h" 29324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "llvm/ADT/StringRef.h" 30324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "llvm/Support/Compiler.h" 31324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include <cctype> 32324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 33324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruvernamespace clang { 34324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class APValue; 35324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class ASTContext; 36324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class BlockDecl; 37324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class CXXBaseSpecifier; 38324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class CXXMemberCallExpr; 39324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class CXXOperatorCallExpr; 40324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class CastExpr; 41324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class Decl; 42324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class IdentifierInfo; 43324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class MaterializeTemporaryExpr; 44324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class NamedDecl; 45324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class ObjCPropertyRefExpr; 46324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class OpaqueValueExpr; 47324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class ParmVarDecl; 48324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class TargetInfo; 49324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class ValueDecl; 50324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 51324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/// \brief A simple array of base specifiers. 52324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruvertypedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 53324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 54324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/// \brief An adjustment to be made to the temporary created when emitting a 55324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/// reference binding, which accesses a particular subobject of that temporary. 56324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverstruct SubobjectAdjustment { 57324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver enum { 58324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver DerivedToBaseAdjustment, 59324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver FieldAdjustment, 60324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MemberPointerAdjustment 61324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } Kind; 62324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 63324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver union { 64324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver struct { 65324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const CastExpr *BasePath; 66324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const CXXRecordDecl *DerivedClass; 67324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } DerivedToBase; 68324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 69324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver FieldDecl *Field; 70324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 71324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver struct { 72324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const MemberPointerType *MPT; 73324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Expr *RHS; 74324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } Ptr; 75324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 76324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 77324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver SubobjectAdjustment(const CastExpr *BasePath, 78324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const CXXRecordDecl *DerivedClass) 79324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver : Kind(DerivedToBaseAdjustment) { 80324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver DerivedToBase.BasePath = BasePath; 81324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver DerivedToBase.DerivedClass = DerivedClass; 82324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 83324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 84324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver SubobjectAdjustment(FieldDecl *Field) 85324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver : Kind(FieldAdjustment) { 86324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver this->Field = Field; 87324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 88324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 89324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver SubobjectAdjustment(const MemberPointerType *MPT, Expr *RHS) 90324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver : Kind(MemberPointerAdjustment) { 91324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver this->Ptr.MPT = MPT; 92324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver this->Ptr.RHS = RHS; 93324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 94324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver}; 95324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 96324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/// Expr - This represents one expression. Note that Expr's are subclasses of 97324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/// Stmt. This allows an expression to be transparently used any place a Stmt 98324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/// is required. 99324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/// 100324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverclass Expr : public Stmt { 101324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver QualType TR; 102324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 103324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverprotected: 104324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 105324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 106324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver : Stmt(SC) 107324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 108324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.TypeDependent = TD; 109324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.ValueDependent = VD; 110324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.InstantiationDependent = ID; 111324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.ValueKind = VK; 112324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.ObjectKind = OK; 113324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 114324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver setType(T); 115324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 116324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 117324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Construct an empty expression. 118324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 119324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 120324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverpublic: 121324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver QualType getType() const { return TR; } 122324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void setType(QualType t) { 123324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // In C++, the type of an expression is always adjusted so that it 124324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // will not have reference type an expression will never have 125324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // reference type (C++ [expr]p6). Use 126324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // QualType::getNonReferenceType() to retrieve the non-reference 127324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // type. Additionally, inspect Expr::isLvalue to determine whether 128324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // an expression that is adjusted in this manner should be 129324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // considered an lvalue. 130324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver assert((t.isNull() || !t->isReferenceType()) && 131324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver "Expressions can't have reference type"); 132324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 133324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver TR = t; 134324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 135324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 136324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isValueDependent - Determines whether this expression is 137324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// value-dependent (C++ [temp.dep.constexpr]). For example, the 138324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// array bound of "Chars" in the following example is 139324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// value-dependent. 140324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// @code 141324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// template<int Size, char (&Chars)[Size]> struct meta_string; 142324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// @endcode 143324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isValueDependent() const { return ExprBits.ValueDependent; } 144324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 145324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Set whether this expression is value-dependent or not. 146324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void setValueDependent(bool VD) { 147324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.ValueDependent = VD; 148324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (VD) 149324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.InstantiationDependent = true; 150324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 151324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 152324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isTypeDependent - Determines whether this expression is 153324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// type-dependent (C++ [temp.dep.expr]), which means that its type 154324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// could change from one template instantiation to the next. For 155324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// example, the expressions "x" and "x + y" are type-dependent in 156324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// the following code, but "y" is not type-dependent: 157324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// @code 158324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// template<typename T> 159324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// void add(T x, int y) { 160324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// x + y; 161324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// } 162324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// @endcode 163324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isTypeDependent() const { return ExprBits.TypeDependent; } 164324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 165324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Set whether this expression is type-dependent or not. 166324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void setTypeDependent(bool TD) { 167324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.TypeDependent = TD; 168324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (TD) 169324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.InstantiationDependent = true; 170324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 171324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 172324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Whether this expression is instantiation-dependent, meaning that 173324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// it depends in some way on a template parameter, even if neither its type 174324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// nor (constant) value can change due to the template instantiation. 175324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 176324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 177324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// instantiation-dependent (since it involves a template parameter \c T), but 178324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// is neither type- nor value-dependent, since the type of the inner 179324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 180324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \c sizeof is known. 181324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 182324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \code 183324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// template<typename T> 184324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// void f(T x, T y) { 185324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// sizeof(sizeof(T() + T()); 186324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// } 187324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \endcode 188324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 189324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isInstantiationDependent() const { 190324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return ExprBits.InstantiationDependent; 191324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 192324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 193324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Set whether this expression is instantiation-dependent or not. 194324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void setInstantiationDependent(bool ID) { 195324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.InstantiationDependent = ID; 196324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 197324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 198324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Whether this expression contains an unexpanded parameter 199324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// pack (for C++0x variadic templates). 200324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 201324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// Given the following function template: 202324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 203324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \code 204324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// template<typename F, typename ...Types> 205324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// void forward(const F &f, Types &&...args) { 206324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// f(static_cast<Types&&>(args)...); 207324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// } 208324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \endcode 209324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 210324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// The expressions \c args and \c static_cast<Types&&>(args) both 211324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// contain parameter packs. 212324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool containsUnexpandedParameterPack() const { 213324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return ExprBits.ContainsUnexpandedParameterPack; 214324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 215324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 216324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Set the bit that describes whether this expression 217324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// contains an unexpanded parameter pack. 218324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void setContainsUnexpandedParameterPack(bool PP = true) { 219324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprBits.ContainsUnexpandedParameterPack = PP; 220324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 221324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 222324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// getExprLoc - Return the preferred location for the arrow when diagnosing 223324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// a problem with a generic expression. 224324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver SourceLocation getExprLoc() const LLVM_READONLY; 225324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 226324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isUnusedResultAWarning - Return true if this immediate expression should 227324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// be warned about if the result is unused. If so, fill in expr, location, 228324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// and ranges with expr to warn on and source locations/ranges appropriate 229324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// for a warning. 230324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 231324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver SourceRange &R1, SourceRange &R2, 232324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ASTContext &Ctx) const; 233324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 234324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isLValue - True if this expression is an "l-value" according to 235324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// the rules of the current language. C and C++ give somewhat 236324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// different rules for this concept, but in general, the result of 237324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// an l-value expression identifies a specific object whereas the 238324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// result of an r-value expression is a value detached from any 239324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// specific storage. 240324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 241324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// C++0x divides the concept of "r-value" into pure r-values 242324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// ("pr-values") and so-called expiring values ("x-values"), which 243324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// identify specific objects that can be safely cannibalized for 244324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// their resources. This is an unfortunate abuse of terminology on 245324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// the part of the C++ committee. In Clang, when we say "r-value", 246324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// we generally mean a pr-value. 247324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isLValue() const { return getValueKind() == VK_LValue; } 248324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isRValue() const { return getValueKind() == VK_RValue; } 249324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isXValue() const { return getValueKind() == VK_XValue; } 250324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isGLValue() const { return getValueKind() != VK_RValue; } 251324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 252324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver enum LValueClassification { 253324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_Valid, 254324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_NotObjectType, 255324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_IncompleteVoidType, 256324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_DuplicateVectorComponents, 257324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_InvalidExpression, 258324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_InvalidMessageExpression, 259324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_MemberFunction, 260324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_SubObjCPropertySetting, 261324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_ClassTemporary, 262324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LV_ArrayTemporary 263324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 264324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// Reasons why an expression might not be an l-value. 265324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver LValueClassification ClassifyLValue(ASTContext &Ctx) const; 266324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 267324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver enum isModifiableLvalueResult { 268324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_Valid, 269324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_NotObjectType, 270324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_IncompleteVoidType, 271324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_DuplicateVectorComponents, 272324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_InvalidExpression, 273324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 274324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_IncompleteType, 275324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_ConstQualified, 276324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_ArrayType, 277324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_ReadonlyProperty, 278324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_NoSetterProperty, 279324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_MemberFunction, 280324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_SubObjCPropertySetting, 281324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_InvalidMessageExpression, 282324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_ClassTemporary, 283324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MLV_ArrayTemporary 284324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 285324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 286324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// does not have an incomplete type, does not have a const-qualified type, 287324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// and if it is a structure or union, does not have any member (including, 288324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// recursively, any member or element of all contained aggregates or unions) 289324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// with a const-qualified type. 290324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 291324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \param Loc [in,out] - A source location which *may* be filled 292324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// in with the location of the expression making this a 293324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// non-modifiable lvalue, if specified. 294324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 295324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver SourceLocation *Loc = 0) const; 296324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 297324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief The return type of classify(). Represents the C++0x expression 298324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// taxonomy. 299324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver class Classification { 300324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public: 301324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief The various classification results. Most of these mean prvalue. 302324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver enum Kinds { 303324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_LValue, 304324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_XValue, 305324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_Function, // Functions cannot be lvalues in C. 306324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_Void, // Void cannot be an lvalue in C. 307324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_AddressableVoid, // Void expression whose address can be taken in C. 308324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_DuplicateVectorComponents, // A vector shuffle with dupes. 309324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_MemberFunction, // An expression referring to a member function 310324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_SubObjCPropertySetting, 311324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_ClassTemporary, // A temporary of class type, or subobject thereof. 312324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_ArrayTemporary, // A temporary of array type. 313324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_ObjCMessageRValue, // ObjC message is an rvalue 314324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CL_PRValue // A prvalue for any other reason, of any other type 315324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 316324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief The results of modification testing. 317324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver enum ModifiableType { 318324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CM_Untested, // testModifiable was false. 319324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CM_Modifiable, 320324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CM_RValue, // Not modifiable because it's an rvalue 321324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CM_Function, // Not modifiable because it's a function; C++ only 322324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 323324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 324324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CM_ConstQualified, 325324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CM_ArrayType, 326324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver CM_IncompleteType 327324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 328324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 329324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver private: 330324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver friend class Expr; 331324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 332324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver unsigned short Kind; 333324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver unsigned short Modifiable; 334324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 335324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver explicit Classification(Kinds k, ModifiableType m) 336324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver : Kind(k), Modifiable(m) 337324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver {} 338324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 339324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver public: 340324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Classification() {} 341324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 342324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Kinds getKind() const { return static_cast<Kinds>(Kind); } 343324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ModifiableType getModifiable() const { 344324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver assert(Modifiable != CM_Untested && "Did not test for modifiability."); 345324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return static_cast<ModifiableType>(Modifiable); 346324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 347324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isLValue() const { return Kind == CL_LValue; } 348324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isXValue() const { return Kind == CL_XValue; } 349324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isGLValue() const { return Kind <= CL_XValue; } 350324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isPRValue() const { return Kind >= CL_Function; } 351324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isRValue() const { return Kind >= CL_XValue; } 352324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isModifiable() const { return getModifiable() == CM_Modifiable; } 353324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 354324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Create a simple, modifiably lvalue 355324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver static Classification makeSimpleLValue() { 356324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return Classification(CL_LValue, CM_Modifiable); 357324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 358324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 359324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 360324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Classify - Classify this expression according to the C++0x 361324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// expression taxonomy. 362324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 363324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 364324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// old lvalue vs rvalue. This function determines the type of expression this 365324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// is. There are three expression types: 366324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// - lvalues are classical lvalues as in C++03. 367324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// - prvalues are equivalent to rvalues in C++03. 368324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 369324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// function returning an rvalue reference. 370324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// lvalues and xvalues are collectively referred to as glvalues, while 371324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// prvalues and xvalues together form rvalues. 372324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Classification Classify(ASTContext &Ctx) const { 373324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return ClassifyImpl(Ctx, 0); 374324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 375324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 376324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief ClassifyModifiable - Classify this expression according to the 377324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// C++0x expression taxonomy, and see if it is valid on the left side 378324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// of an assignment. 379324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 380324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// This function extends classify in that it also tests whether the 381324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// expression is modifiable (C99 6.3.2.1p1). 382324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \param Loc A source location that might be filled with a relevant location 383324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// if the expression is not modifiable. 384324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 385324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return ClassifyImpl(Ctx, &Loc); 386324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 387324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 388324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// getValueKindForType - Given a formal return or parameter type, 389324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// give its value kind. 390324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver static ExprValueKind getValueKindForType(QualType T) { 391324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (const ReferenceType *RT = T->getAs<ReferenceType>()) 392324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return (isa<LValueReferenceType>(RT) 393324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ? VK_LValue 394324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver : (RT->getPointeeType()->isFunctionType() 395324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ? VK_LValue : VK_XValue)); 396324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return VK_RValue; 397324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 398324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 399324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// getValueKind - The value kind that this expression produces. 400324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprValueKind getValueKind() const { 401324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return static_cast<ExprValueKind>(ExprBits.ValueKind); 402324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 403324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 404324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// getObjectKind - The object kind that this expression produces. 405324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// Object kinds are meaningful only for expressions that yield an 406324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// l-value or x-value. 407324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprObjectKind getObjectKind() const { 408324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 409324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 410324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 411324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isOrdinaryOrBitFieldObject() const { 412324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ExprObjectKind OK = getObjectKind(); 413324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return (OK == OK_Ordinary || OK == OK_BitField); 414324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 415324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 416324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// setValueKind - Set the value kind produced by this expression. 417324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 418324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 419324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// setObjectKind - Set the object kind produced by this expression. 420324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 421324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 422324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverprivate: 423324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 424324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 425324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverpublic: 426324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 427324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief If this expression refers to a bit-field, retrieve the 428324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// declaration of that bit-field. 429324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver FieldDecl *getBitField(); 430324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 431324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const FieldDecl *getBitField() const { 432324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return const_cast<Expr*>(this)->getBitField(); 433324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 434324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 435324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief If this expression is an l-value for an Objective C 436324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// property, find the underlying property reference expression. 437324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver const ObjCPropertyRefExpr *getObjCProperty() const; 438324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 439324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Check if this expression is the ObjC 'self' implicit parameter. 440324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isObjCSelfExpr() const; 441324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 442324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Returns whether this expression refers to a vector element. 443324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool refersToVectorElement() const; 444324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 445324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Returns whether this expression has a placeholder type. 446324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool hasPlaceholderType() const { 447324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return getType()->isPlaceholderType(); 448324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 449324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 450324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// \brief Returns whether this expression has a specific placeholder type. 451324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool hasPlaceholderType(BuiltinType::Kind K) const { 452324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver assert(BuiltinType::isPlaceholderTypeKind(K)); 453324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 454324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return BT->getKind() == K; 455324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return false; 456324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 457324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 458324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isKnownToHaveBooleanValue - Return true if this is an integer expression 459324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// that is known to return 0 or 1. This happens for _Bool/bool expressions 460324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// but also int expressions which are produced by things like comparisons in 461324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// C. 462324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isKnownToHaveBooleanValue() const; 463324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 464324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isIntegerConstantExpr - Return true if this expression is a valid integer 465324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// constant expression, and, if so, return its value in Result. If not a 466324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// valid i-c-e, return false and fill in Loc (if specified) with the location 467324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// of the invalid expression. 468324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 469324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// Note: This does not perform the implicit conversions required by C++11 470324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// [expr.const]p5. 471324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 472324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver SourceLocation *Loc = 0, 473324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isEvaluated = true) const; 474324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 475324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 476324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isCXX98IntegralConstantExpr - Return true if this expression is an 477324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// integral constant expression in C++98. Can only be used in C++. 478324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 479324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 480324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isCXX11ConstantExpr - Return true if this expression is a constant 481324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// expression in C++11. Can only be used in C++. 482324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// 483324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// Note: This does not perform the implicit conversions required by C++11 484324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// [expr.const]p5. 485324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 486324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver SourceLocation *Loc = 0) const; 487324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 488324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isPotentialConstantExpr - Return true if this function's definition 489324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// might be usable in a constant expression in C++11, if it were marked 490324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// constexpr. Return false if the function can never produce a constant 491324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// expression, along with diagnostics describing why not. 492324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver static bool isPotentialConstantExpr(const FunctionDecl *FD, 493324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver llvm::SmallVectorImpl< 494324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver PartialDiagnosticAt> &Diags); 495324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 496324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// isConstantInitializer - Returns true if this expression can be emitted to 497324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// IR as a constant, and thus can be used as a constant initializer in C. 498324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 499324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 500324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// EvalStatus is a struct with detailed info about an evaluation in progress. 501324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver struct EvalStatus { 502324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// HasSideEffects - Whether the evaluated expression has side effects. 503324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// For example, (f() && 0) can be folded, but it still has side effects. 504324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool HasSideEffects; 505324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 506324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// Diag - If this is non-null, it will be filled in with a stack of notes 507324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// indicating why evaluation failed (or why it failed to produce a constant 508324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// expression). 509324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// If the expression is unfoldable, the notes will indicate why it's not 510324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// foldable. If the expression is foldable, but not a constant expression, 511324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// the notes will describes why it isn't a constant expression. If the 512324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// expression *is* a constant expression, no notes will be produced. 513324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 514324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 515324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver EvalStatus() : HasSideEffects(false), Diag(0) {} 516324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 517324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // hasSideEffects - Return true if the evaluated expression has 518324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // side effects. 519324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool hasSideEffects() const { 520324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return HasSideEffects; 521324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 522324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 523324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 524324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// EvalResult is a struct with detailed info about an evaluated expression. 525324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver struct EvalResult : EvalStatus { 526324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /// Val - This is the value the expression can be folded to. 527324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver APValue Val; 528324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 529324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // isGlobalLValue - Return true if the evaluated lvalue expression 530324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver // is global. 531324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver bool isGlobalLValue() const; 532324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver }; 533 534 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 535 /// an rvalue using any crazy technique (that has nothing to do with language 536 /// standards) that we want to, even if the expression has side-effects. If 537 /// this function returns true, it returns the folded constant in Result. If 538 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 539 /// applied. 540 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 541 542 /// EvaluateAsBooleanCondition - Return true if this is a constant 543 /// which we we can fold and convert to a boolean condition using 544 /// any crazy technique that we want to, even if the expression has 545 /// side-effects. 546 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 547 548 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 549 550 /// EvaluateAsInt - Return true if this is a constant which we can fold and 551 /// convert to an integer, using any crazy technique that we want to. 552 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 553 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 554 555 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 556 /// constant folded without side-effects, but discard the result. 557 bool isEvaluatable(const ASTContext &Ctx) const; 558 559 /// HasSideEffects - This routine returns true for all those expressions 560 /// which have any effect other than producing a value. Example is a function 561 /// call, volatile variable read, or throwing an exception. 562 bool HasSideEffects(const ASTContext &Ctx) const; 563 564 /// \brief Determine whether this expression involves a call to any function 565 /// that is not trivial. 566 bool hasNonTrivialCall(ASTContext &Ctx); 567 568 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 569 /// integer. This must be called on an expression that constant folds to an 570 /// integer. 571 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 572 573 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 574 /// lvalue with link time known address, with no side-effects. 575 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 576 577 /// EvaluateAsInitializer - Evaluate an expression as if it were the 578 /// initializer of the given declaration. Returns true if the initializer 579 /// can be folded to a constant, and produces any relevant notes. In C++11, 580 /// notes will be produced if the expression is not a constant expression. 581 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 582 const VarDecl *VD, 583 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 584 585 /// \brief Enumeration used to describe the kind of Null pointer constant 586 /// returned from \c isNullPointerConstant(). 587 enum NullPointerConstantKind { 588 /// \brief Expression is not a Null pointer constant. 589 NPCK_NotNull = 0, 590 591 /// \brief Expression is a Null pointer constant built from a zero integer 592 /// expression that is not a simple, possibly parenthesized, zero literal. 593 /// C++ Core Issue 903 will classify these expressions as "not pointers" 594 /// once it is adopted. 595 /// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903 596 NPCK_ZeroExpression, 597 598 /// \brief Expression is a Null pointer constant built from a literal zero. 599 NPCK_ZeroLiteral, 600 601 /// \brief Expression is a C++0X nullptr. 602 NPCK_CXX0X_nullptr, 603 604 /// \brief Expression is a GNU-style __null constant. 605 NPCK_GNUNull 606 }; 607 608 /// \brief Enumeration used to describe how \c isNullPointerConstant() 609 /// should cope with value-dependent expressions. 610 enum NullPointerConstantValueDependence { 611 /// \brief Specifies that the expression should never be value-dependent. 612 NPC_NeverValueDependent = 0, 613 614 /// \brief Specifies that a value-dependent expression of integral or 615 /// dependent type should be considered a null pointer constant. 616 NPC_ValueDependentIsNull, 617 618 /// \brief Specifies that a value-dependent expression should be considered 619 /// to never be a null pointer constant. 620 NPC_ValueDependentIsNotNull 621 }; 622 623 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 624 /// a Null pointer constant. The return value can further distinguish the 625 /// kind of NULL pointer constant that was detected. 626 NullPointerConstantKind isNullPointerConstant( 627 ASTContext &Ctx, 628 NullPointerConstantValueDependence NPC) const; 629 630 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 631 /// write barrier. 632 bool isOBJCGCCandidate(ASTContext &Ctx) const; 633 634 /// \brief Returns true if this expression is a bound member function. 635 bool isBoundMemberFunction(ASTContext &Ctx) const; 636 637 /// \brief Given an expression of bound-member type, find the type 638 /// of the member. Returns null if this is an *overloaded* bound 639 /// member expression. 640 static QualType findBoundMemberType(const Expr *expr); 641 642 /// IgnoreImpCasts - Skip past any implicit casts which might 643 /// surround this expression. Only skips ImplicitCastExprs. 644 Expr *IgnoreImpCasts() LLVM_READONLY; 645 646 /// IgnoreImplicit - Skip past any implicit AST nodes which might 647 /// surround this expression. 648 Expr *IgnoreImplicit() LLVM_READONLY { 649 return cast<Expr>(Stmt::IgnoreImplicit()); 650 } 651 652 const Expr *IgnoreImplicit() const LLVM_READONLY { 653 return const_cast<Expr*>(this)->IgnoreImplicit(); 654 } 655 656 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 657 /// its subexpression. If that subexpression is also a ParenExpr, 658 /// then this method recursively returns its subexpression, and so forth. 659 /// Otherwise, the method returns the current Expr. 660 Expr *IgnoreParens() LLVM_READONLY; 661 662 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 663 /// or CastExprs, returning their operand. 664 Expr *IgnoreParenCasts() LLVM_READONLY; 665 666 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 667 /// any ParenExpr or ImplicitCastExprs, returning their operand. 668 Expr *IgnoreParenImpCasts() LLVM_READONLY; 669 670 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 671 /// call to a conversion operator, return the argument. 672 Expr *IgnoreConversionOperator() LLVM_READONLY; 673 674 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 675 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 676 } 677 678 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 679 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 680 } 681 682 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 683 /// CastExprs that represent lvalue casts, returning their operand. 684 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 685 686 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 687 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 688 } 689 690 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 691 /// value (including ptr->int casts of the same size). Strip off any 692 /// ParenExpr or CastExprs, returning their operand. 693 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 694 695 /// Ignore parentheses and derived-to-base casts. 696 Expr *ignoreParenBaseCasts() LLVM_READONLY; 697 698 const Expr *ignoreParenBaseCasts() const LLVM_READONLY { 699 return const_cast<Expr*>(this)->ignoreParenBaseCasts(); 700 } 701 702 /// \brief Determine whether this expression is a default function argument. 703 /// 704 /// Default arguments are implicitly generated in the abstract syntax tree 705 /// by semantic analysis for function calls, object constructions, etc. in 706 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 707 /// this routine also looks through any implicit casts to determine whether 708 /// the expression is a default argument. 709 bool isDefaultArgument() const; 710 711 /// \brief Determine whether the result of this expression is a 712 /// temporary object of the given class type. 713 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 714 715 /// \brief Whether this expression is an implicit reference to 'this' in C++. 716 bool isImplicitCXXThis() const; 717 718 const Expr *IgnoreImpCasts() const LLVM_READONLY { 719 return const_cast<Expr*>(this)->IgnoreImpCasts(); 720 } 721 const Expr *IgnoreParens() const LLVM_READONLY { 722 return const_cast<Expr*>(this)->IgnoreParens(); 723 } 724 const Expr *IgnoreParenCasts() const LLVM_READONLY { 725 return const_cast<Expr*>(this)->IgnoreParenCasts(); 726 } 727 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 728 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 729 } 730 731 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 732 733 /// \brief For an expression of class type or pointer to class type, 734 /// return the most derived class decl the expression is known to refer to. 735 /// 736 /// If this expression is a cast, this method looks through it to find the 737 /// most derived decl that can be inferred from the expression. 738 /// This is valid because derived-to-base conversions have undefined 739 /// behavior if the object isn't dynamically of the derived type. 740 const CXXRecordDecl *getBestDynamicClassType() const; 741 742 /// Walk outwards from an expression we want to bind a reference to and 743 /// find the expression whose lifetime needs to be extended. Record 744 /// the adjustments needed along the path. 745 const Expr * 746 skipRValueSubobjectAdjustments( 747 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const; 748 749 /// Skip irrelevant expressions to find what should be materialize for 750 /// binding with a reference. 751 const Expr * 752 findMaterializedTemporary(const MaterializeTemporaryExpr *&MTE) const; 753 754 static bool classof(const Stmt *T) { 755 return T->getStmtClass() >= firstExprConstant && 756 T->getStmtClass() <= lastExprConstant; 757 } 758}; 759 760 761//===----------------------------------------------------------------------===// 762// Primary Expressions. 763//===----------------------------------------------------------------------===// 764 765/// OpaqueValueExpr - An expression referring to an opaque object of a 766/// fixed type and value class. These don't correspond to concrete 767/// syntax; instead they're used to express operations (usually copy 768/// operations) on values whose source is generally obvious from 769/// context. 770class OpaqueValueExpr : public Expr { 771 friend class ASTStmtReader; 772 Expr *SourceExpr; 773 SourceLocation Loc; 774 775public: 776 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 777 ExprObjectKind OK = OK_Ordinary, 778 Expr *SourceExpr = 0) 779 : Expr(OpaqueValueExprClass, T, VK, OK, 780 T->isDependentType(), 781 T->isDependentType() || 782 (SourceExpr && SourceExpr->isValueDependent()), 783 T->isInstantiationDependentType(), 784 false), 785 SourceExpr(SourceExpr), Loc(Loc) { 786 } 787 788 /// Given an expression which invokes a copy constructor --- i.e. a 789 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 790 /// find the OpaqueValueExpr that's the source of the construction. 791 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 792 793 explicit OpaqueValueExpr(EmptyShell Empty) 794 : Expr(OpaqueValueExprClass, Empty) { } 795 796 /// \brief Retrieve the location of this expression. 797 SourceLocation getLocation() const { return Loc; } 798 799 SourceLocation getLocStart() const LLVM_READONLY { 800 return SourceExpr ? SourceExpr->getLocStart() : Loc; 801 } 802 SourceLocation getLocEnd() const LLVM_READONLY { 803 return SourceExpr ? SourceExpr->getLocEnd() : Loc; 804 } 805 SourceLocation getExprLoc() const LLVM_READONLY { 806 if (SourceExpr) return SourceExpr->getExprLoc(); 807 return Loc; 808 } 809 810 child_range children() { return child_range(); } 811 812 /// The source expression of an opaque value expression is the 813 /// expression which originally generated the value. This is 814 /// provided as a convenience for analyses that don't wish to 815 /// precisely model the execution behavior of the program. 816 /// 817 /// The source expression is typically set when building the 818 /// expression which binds the opaque value expression in the first 819 /// place. 820 Expr *getSourceExpr() const { return SourceExpr; } 821 822 static bool classof(const Stmt *T) { 823 return T->getStmtClass() == OpaqueValueExprClass; 824 } 825}; 826 827/// \brief A reference to a declared variable, function, enum, etc. 828/// [C99 6.5.1p2] 829/// 830/// This encodes all the information about how a declaration is referenced 831/// within an expression. 832/// 833/// There are several optional constructs attached to DeclRefExprs only when 834/// they apply in order to conserve memory. These are laid out past the end of 835/// the object, and flags in the DeclRefExprBitfield track whether they exist: 836/// 837/// DeclRefExprBits.HasQualifier: 838/// Specifies when this declaration reference expression has a C++ 839/// nested-name-specifier. 840/// DeclRefExprBits.HasFoundDecl: 841/// Specifies when this declaration reference expression has a record of 842/// a NamedDecl (different from the referenced ValueDecl) which was found 843/// during name lookup and/or overload resolution. 844/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 845/// Specifies when this declaration reference expression has an explicit 846/// C++ template keyword and/or template argument list. 847/// DeclRefExprBits.RefersToEnclosingLocal 848/// Specifies when this declaration reference expression (validly) 849/// refers to a local variable from a different function. 850class DeclRefExpr : public Expr { 851 /// \brief The declaration that we are referencing. 852 ValueDecl *D; 853 854 /// \brief The location of the declaration name itself. 855 SourceLocation Loc; 856 857 /// \brief Provides source/type location info for the declaration name 858 /// embedded in D. 859 DeclarationNameLoc DNLoc; 860 861 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 862 NestedNameSpecifierLoc &getInternalQualifierLoc() { 863 assert(hasQualifier()); 864 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 865 } 866 867 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 868 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 869 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 870 } 871 872 /// \brief Test whether there is a distinct FoundDecl attached to the end of 873 /// this DRE. 874 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 875 876 /// \brief Helper to retrieve the optional NamedDecl through which this 877 /// reference occured. 878 NamedDecl *&getInternalFoundDecl() { 879 assert(hasFoundDecl()); 880 if (hasQualifier()) 881 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 882 return *reinterpret_cast<NamedDecl **>(this + 1); 883 } 884 885 /// \brief Helper to retrieve the optional NamedDecl through which this 886 /// reference occured. 887 NamedDecl *getInternalFoundDecl() const { 888 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 889 } 890 891 DeclRefExpr(ASTContext &Ctx, 892 NestedNameSpecifierLoc QualifierLoc, 893 SourceLocation TemplateKWLoc, 894 ValueDecl *D, bool refersToEnclosingLocal, 895 const DeclarationNameInfo &NameInfo, 896 NamedDecl *FoundD, 897 const TemplateArgumentListInfo *TemplateArgs, 898 QualType T, ExprValueKind VK); 899 900 /// \brief Construct an empty declaration reference expression. 901 explicit DeclRefExpr(EmptyShell Empty) 902 : Expr(DeclRefExprClass, Empty) { } 903 904 /// \brief Computes the type- and value-dependence flags for this 905 /// declaration reference expression. 906 void computeDependence(ASTContext &C); 907 908public: 909 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T, 910 ExprValueKind VK, SourceLocation L, 911 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 912 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 913 D(D), Loc(L), DNLoc(LocInfo) { 914 DeclRefExprBits.HasQualifier = 0; 915 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 916 DeclRefExprBits.HasFoundDecl = 0; 917 DeclRefExprBits.HadMultipleCandidates = 0; 918 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal; 919 computeDependence(D->getASTContext()); 920 } 921 922 static DeclRefExpr *Create(ASTContext &Context, 923 NestedNameSpecifierLoc QualifierLoc, 924 SourceLocation TemplateKWLoc, 925 ValueDecl *D, 926 bool isEnclosingLocal, 927 SourceLocation NameLoc, 928 QualType T, ExprValueKind VK, 929 NamedDecl *FoundD = 0, 930 const TemplateArgumentListInfo *TemplateArgs = 0); 931 932 static DeclRefExpr *Create(ASTContext &Context, 933 NestedNameSpecifierLoc QualifierLoc, 934 SourceLocation TemplateKWLoc, 935 ValueDecl *D, 936 bool isEnclosingLocal, 937 const DeclarationNameInfo &NameInfo, 938 QualType T, ExprValueKind VK, 939 NamedDecl *FoundD = 0, 940 const TemplateArgumentListInfo *TemplateArgs = 0); 941 942 /// \brief Construct an empty declaration reference expression. 943 static DeclRefExpr *CreateEmpty(ASTContext &Context, 944 bool HasQualifier, 945 bool HasFoundDecl, 946 bool HasTemplateKWAndArgsInfo, 947 unsigned NumTemplateArgs); 948 949 ValueDecl *getDecl() { return D; } 950 const ValueDecl *getDecl() const { return D; } 951 void setDecl(ValueDecl *NewD) { D = NewD; } 952 953 DeclarationNameInfo getNameInfo() const { 954 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 955 } 956 957 SourceLocation getLocation() const { return Loc; } 958 void setLocation(SourceLocation L) { Loc = L; } 959 SourceLocation getLocStart() const LLVM_READONLY; 960 SourceLocation getLocEnd() const LLVM_READONLY; 961 962 /// \brief Determine whether this declaration reference was preceded by a 963 /// C++ nested-name-specifier, e.g., \c N::foo. 964 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 965 966 /// \brief If the name was qualified, retrieves the nested-name-specifier 967 /// that precedes the name. Otherwise, returns NULL. 968 NestedNameSpecifier *getQualifier() const { 969 if (!hasQualifier()) 970 return 0; 971 972 return getInternalQualifierLoc().getNestedNameSpecifier(); 973 } 974 975 /// \brief If the name was qualified, retrieves the nested-name-specifier 976 /// that precedes the name, with source-location information. 977 NestedNameSpecifierLoc getQualifierLoc() const { 978 if (!hasQualifier()) 979 return NestedNameSpecifierLoc(); 980 981 return getInternalQualifierLoc(); 982 } 983 984 /// \brief Get the NamedDecl through which this reference occured. 985 /// 986 /// This Decl may be different from the ValueDecl actually referred to in the 987 /// presence of using declarations, etc. It always returns non-NULL, and may 988 /// simple return the ValueDecl when appropriate. 989 NamedDecl *getFoundDecl() { 990 return hasFoundDecl() ? getInternalFoundDecl() : D; 991 } 992 993 /// \brief Get the NamedDecl through which this reference occurred. 994 /// See non-const variant. 995 const NamedDecl *getFoundDecl() const { 996 return hasFoundDecl() ? getInternalFoundDecl() : D; 997 } 998 999 bool hasTemplateKWAndArgsInfo() const { 1000 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 1001 } 1002 1003 /// \brief Return the optional template keyword and arguments info. 1004 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 1005 if (!hasTemplateKWAndArgsInfo()) 1006 return 0; 1007 1008 if (hasFoundDecl()) 1009 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 1010 &getInternalFoundDecl() + 1); 1011 1012 if (hasQualifier()) 1013 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 1014 &getInternalQualifierLoc() + 1); 1015 1016 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 1017 } 1018 1019 /// \brief Return the optional template keyword and arguments info. 1020 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 1021 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 1022 } 1023 1024 /// \brief Retrieve the location of the template keyword preceding 1025 /// this name, if any. 1026 SourceLocation getTemplateKeywordLoc() const { 1027 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1028 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 1029 } 1030 1031 /// \brief Retrieve the location of the left angle bracket starting the 1032 /// explicit template argument list following the name, if any. 1033 SourceLocation getLAngleLoc() const { 1034 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1035 return getTemplateKWAndArgsInfo()->LAngleLoc; 1036 } 1037 1038 /// \brief Retrieve the location of the right angle bracket ending the 1039 /// explicit template argument list following the name, if any. 1040 SourceLocation getRAngleLoc() const { 1041 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1042 return getTemplateKWAndArgsInfo()->RAngleLoc; 1043 } 1044 1045 /// \brief Determines whether the name in this declaration reference 1046 /// was preceded by the template keyword. 1047 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 1048 1049 /// \brief Determines whether this declaration reference was followed by an 1050 /// explicit template argument list. 1051 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 1052 1053 /// \brief Retrieve the explicit template argument list that followed the 1054 /// member template name. 1055 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 1056 assert(hasExplicitTemplateArgs()); 1057 return *getTemplateKWAndArgsInfo(); 1058 } 1059 1060 /// \brief Retrieve the explicit template argument list that followed the 1061 /// member template name. 1062 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 1063 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 1064 } 1065 1066 /// \brief Retrieves the optional explicit template arguments. 1067 /// This points to the same data as getExplicitTemplateArgs(), but 1068 /// returns null if there are no explicit template arguments. 1069 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 1070 if (!hasExplicitTemplateArgs()) return 0; 1071 return &getExplicitTemplateArgs(); 1072 } 1073 1074 /// \brief Copies the template arguments (if present) into the given 1075 /// structure. 1076 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1077 if (hasExplicitTemplateArgs()) 1078 getExplicitTemplateArgs().copyInto(List); 1079 } 1080 1081 /// \brief Retrieve the template arguments provided as part of this 1082 /// template-id. 1083 const TemplateArgumentLoc *getTemplateArgs() const { 1084 if (!hasExplicitTemplateArgs()) 1085 return 0; 1086 1087 return getExplicitTemplateArgs().getTemplateArgs(); 1088 } 1089 1090 /// \brief Retrieve the number of template arguments provided as part of this 1091 /// template-id. 1092 unsigned getNumTemplateArgs() const { 1093 if (!hasExplicitTemplateArgs()) 1094 return 0; 1095 1096 return getExplicitTemplateArgs().NumTemplateArgs; 1097 } 1098 1099 /// \brief Returns true if this expression refers to a function that 1100 /// was resolved from an overloaded set having size greater than 1. 1101 bool hadMultipleCandidates() const { 1102 return DeclRefExprBits.HadMultipleCandidates; 1103 } 1104 /// \brief Sets the flag telling whether this expression refers to 1105 /// a function that was resolved from an overloaded set having size 1106 /// greater than 1. 1107 void setHadMultipleCandidates(bool V = true) { 1108 DeclRefExprBits.HadMultipleCandidates = V; 1109 } 1110 1111 /// Does this DeclRefExpr refer to a local declaration from an 1112 /// enclosing function scope? 1113 bool refersToEnclosingLocal() const { 1114 return DeclRefExprBits.RefersToEnclosingLocal; 1115 } 1116 1117 static bool classof(const Stmt *T) { 1118 return T->getStmtClass() == DeclRefExprClass; 1119 } 1120 1121 // Iterators 1122 child_range children() { return child_range(); } 1123 1124 friend class ASTStmtReader; 1125 friend class ASTStmtWriter; 1126}; 1127 1128/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1129class PredefinedExpr : public Expr { 1130public: 1131 enum IdentType { 1132 Func, 1133 Function, 1134 LFunction, // Same as Function, but as wide string. 1135 PrettyFunction, 1136 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1137 /// 'virtual' keyword is omitted for virtual member functions. 1138 PrettyFunctionNoVirtual 1139 }; 1140 1141private: 1142 SourceLocation Loc; 1143 IdentType Type; 1144public: 1145 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1146 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1147 type->isDependentType(), type->isDependentType(), 1148 type->isInstantiationDependentType(), 1149 /*ContainsUnexpandedParameterPack=*/false), 1150 Loc(l), Type(IT) {} 1151 1152 /// \brief Construct an empty predefined expression. 1153 explicit PredefinedExpr(EmptyShell Empty) 1154 : Expr(PredefinedExprClass, Empty) { } 1155 1156 IdentType getIdentType() const { return Type; } 1157 void setIdentType(IdentType IT) { Type = IT; } 1158 1159 SourceLocation getLocation() const { return Loc; } 1160 void setLocation(SourceLocation L) { Loc = L; } 1161 1162 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1163 1164 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1165 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1166 1167 static bool classof(const Stmt *T) { 1168 return T->getStmtClass() == PredefinedExprClass; 1169 } 1170 1171 // Iterators 1172 child_range children() { return child_range(); } 1173}; 1174 1175/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1176/// leaking memory. 1177/// 1178/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1179/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1180/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1181/// the APFloat/APInt values will never get freed. APNumericStorage uses 1182/// ASTContext's allocator for memory allocation. 1183class APNumericStorage { 1184 union { 1185 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1186 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1187 }; 1188 unsigned BitWidth; 1189 1190 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1191 1192 APNumericStorage(const APNumericStorage &) LLVM_DELETED_FUNCTION; 1193 void operator=(const APNumericStorage &) LLVM_DELETED_FUNCTION; 1194 1195protected: 1196 APNumericStorage() : VAL(0), BitWidth(0) { } 1197 1198 llvm::APInt getIntValue() const { 1199 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1200 if (NumWords > 1) 1201 return llvm::APInt(BitWidth, NumWords, pVal); 1202 else 1203 return llvm::APInt(BitWidth, VAL); 1204 } 1205 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1206}; 1207 1208class APIntStorage : private APNumericStorage { 1209public: 1210 llvm::APInt getValue() const { return getIntValue(); } 1211 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1212}; 1213 1214class APFloatStorage : private APNumericStorage { 1215public: 1216 llvm::APFloat getValue(bool IsIEEE) const { 1217 return llvm::APFloat(getIntValue(), IsIEEE); 1218 } 1219 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1220 setIntValue(C, Val.bitcastToAPInt()); 1221 } 1222}; 1223 1224class IntegerLiteral : public Expr, public APIntStorage { 1225 SourceLocation Loc; 1226 1227 /// \brief Construct an empty integer literal. 1228 explicit IntegerLiteral(EmptyShell Empty) 1229 : Expr(IntegerLiteralClass, Empty) { } 1230 1231public: 1232 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1233 // or UnsignedLongLongTy 1234 IntegerLiteral(ASTContext &C, const llvm::APInt &V, QualType type, 1235 SourceLocation l); 1236 1237 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1238 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1239 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1240 /// \param V - the value that the returned integer literal contains. 1241 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1242 QualType type, SourceLocation l); 1243 /// \brief Returns a new empty integer literal. 1244 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1245 1246 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1247 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1248 1249 /// \brief Retrieve the location of the literal. 1250 SourceLocation getLocation() const { return Loc; } 1251 1252 void setLocation(SourceLocation Location) { Loc = Location; } 1253 1254 static bool classof(const Stmt *T) { 1255 return T->getStmtClass() == IntegerLiteralClass; 1256 } 1257 1258 // Iterators 1259 child_range children() { return child_range(); } 1260}; 1261 1262class CharacterLiteral : public Expr { 1263public: 1264 enum CharacterKind { 1265 Ascii, 1266 Wide, 1267 UTF16, 1268 UTF32 1269 }; 1270 1271private: 1272 unsigned Value; 1273 SourceLocation Loc; 1274public: 1275 // type should be IntTy 1276 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1277 SourceLocation l) 1278 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1279 false, false), 1280 Value(value), Loc(l) { 1281 CharacterLiteralBits.Kind = kind; 1282 } 1283 1284 /// \brief Construct an empty character literal. 1285 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1286 1287 SourceLocation getLocation() const { return Loc; } 1288 CharacterKind getKind() const { 1289 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1290 } 1291 1292 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1293 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1294 1295 unsigned getValue() const { return Value; } 1296 1297 void setLocation(SourceLocation Location) { Loc = Location; } 1298 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1299 void setValue(unsigned Val) { Value = Val; } 1300 1301 static bool classof(const Stmt *T) { 1302 return T->getStmtClass() == CharacterLiteralClass; 1303 } 1304 1305 // Iterators 1306 child_range children() { return child_range(); } 1307}; 1308 1309class FloatingLiteral : public Expr, private APFloatStorage { 1310 SourceLocation Loc; 1311 1312 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1313 QualType Type, SourceLocation L); 1314 1315 /// \brief Construct an empty floating-point literal. 1316 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty); 1317 1318public: 1319 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1320 bool isexact, QualType Type, SourceLocation L); 1321 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1322 1323 llvm::APFloat getValue() const { 1324 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1325 } 1326 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1327 APFloatStorage::setValue(C, Val); 1328 } 1329 1330 bool isExact() const { return FloatingLiteralBits.IsExact; } 1331 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1332 1333 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1334 /// double. Note that this may cause loss of precision, but is useful for 1335 /// debugging dumps, etc. 1336 double getValueAsApproximateDouble() const; 1337 1338 SourceLocation getLocation() const { return Loc; } 1339 void setLocation(SourceLocation L) { Loc = L; } 1340 1341 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1342 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1343 1344 static bool classof(const Stmt *T) { 1345 return T->getStmtClass() == FloatingLiteralClass; 1346 } 1347 1348 // Iterators 1349 child_range children() { return child_range(); } 1350}; 1351 1352/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1353/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1354/// IntegerLiteral classes. Instances of this class always have a Complex type 1355/// whose element type matches the subexpression. 1356/// 1357class ImaginaryLiteral : public Expr { 1358 Stmt *Val; 1359public: 1360 ImaginaryLiteral(Expr *val, QualType Ty) 1361 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1362 false, false), 1363 Val(val) {} 1364 1365 /// \brief Build an empty imaginary literal. 1366 explicit ImaginaryLiteral(EmptyShell Empty) 1367 : Expr(ImaginaryLiteralClass, Empty) { } 1368 1369 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1370 Expr *getSubExpr() { return cast<Expr>(Val); } 1371 void setSubExpr(Expr *E) { Val = E; } 1372 1373 SourceLocation getLocStart() const LLVM_READONLY { return Val->getLocStart(); } 1374 SourceLocation getLocEnd() const LLVM_READONLY { return Val->getLocEnd(); } 1375 1376 static bool classof(const Stmt *T) { 1377 return T->getStmtClass() == ImaginaryLiteralClass; 1378 } 1379 1380 // Iterators 1381 child_range children() { return child_range(&Val, &Val+1); } 1382}; 1383 1384/// StringLiteral - This represents a string literal expression, e.g. "foo" 1385/// or L"bar" (wide strings). The actual string is returned by getStrData() 1386/// is NOT null-terminated, and the length of the string is determined by 1387/// calling getByteLength(). The C type for a string is always a 1388/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1389/// not. 1390/// 1391/// Note that strings in C can be formed by concatenation of multiple string 1392/// literal pptokens in translation phase #6. This keeps track of the locations 1393/// of each of these pieces. 1394/// 1395/// Strings in C can also be truncated and extended by assigning into arrays, 1396/// e.g. with constructs like: 1397/// char X[2] = "foobar"; 1398/// In this case, getByteLength() will return 6, but the string literal will 1399/// have type "char[2]". 1400class StringLiteral : public Expr { 1401public: 1402 enum StringKind { 1403 Ascii, 1404 Wide, 1405 UTF8, 1406 UTF16, 1407 UTF32 1408 }; 1409 1410private: 1411 friend class ASTStmtReader; 1412 1413 union { 1414 const char *asChar; 1415 const uint16_t *asUInt16; 1416 const uint32_t *asUInt32; 1417 } StrData; 1418 unsigned Length; 1419 unsigned CharByteWidth : 4; 1420 unsigned Kind : 3; 1421 unsigned IsPascal : 1; 1422 unsigned NumConcatenated; 1423 SourceLocation TokLocs[1]; 1424 1425 StringLiteral(QualType Ty) : 1426 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1427 false) {} 1428 1429 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1430 1431public: 1432 /// This is the "fully general" constructor that allows representation of 1433 /// strings formed from multiple concatenated tokens. 1434 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1435 bool Pascal, QualType Ty, 1436 const SourceLocation *Loc, unsigned NumStrs); 1437 1438 /// Simple constructor for string literals made from one token. 1439 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1440 bool Pascal, QualType Ty, 1441 SourceLocation Loc) { 1442 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1443 } 1444 1445 /// \brief Construct an empty string literal. 1446 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1447 1448 StringRef getString() const { 1449 assert(CharByteWidth==1 1450 && "This function is used in places that assume strings use char"); 1451 return StringRef(StrData.asChar, getByteLength()); 1452 } 1453 1454 /// Allow access to clients that need the byte representation, such as 1455 /// ASTWriterStmt::VisitStringLiteral(). 1456 StringRef getBytes() const { 1457 // FIXME: StringRef may not be the right type to use as a result for this. 1458 if (CharByteWidth == 1) 1459 return StringRef(StrData.asChar, getByteLength()); 1460 if (CharByteWidth == 4) 1461 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1462 getByteLength()); 1463 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1464 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1465 getByteLength()); 1466 } 1467 1468 void outputString(raw_ostream &OS); 1469 1470 uint32_t getCodeUnit(size_t i) const { 1471 assert(i < Length && "out of bounds access"); 1472 if (CharByteWidth == 1) 1473 return static_cast<unsigned char>(StrData.asChar[i]); 1474 if (CharByteWidth == 4) 1475 return StrData.asUInt32[i]; 1476 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1477 return StrData.asUInt16[i]; 1478 } 1479 1480 unsigned getByteLength() const { return CharByteWidth*Length; } 1481 unsigned getLength() const { return Length; } 1482 unsigned getCharByteWidth() const { return CharByteWidth; } 1483 1484 /// \brief Sets the string data to the given string data. 1485 void setString(ASTContext &C, StringRef Str, 1486 StringKind Kind, bool IsPascal); 1487 1488 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1489 1490 1491 bool isAscii() const { return Kind == Ascii; } 1492 bool isWide() const { return Kind == Wide; } 1493 bool isUTF8() const { return Kind == UTF8; } 1494 bool isUTF16() const { return Kind == UTF16; } 1495 bool isUTF32() const { return Kind == UTF32; } 1496 bool isPascal() const { return IsPascal; } 1497 1498 bool containsNonAsciiOrNull() const { 1499 StringRef Str = getString(); 1500 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1501 if (!isascii(Str[i]) || !Str[i]) 1502 return true; 1503 return false; 1504 } 1505 1506 /// getNumConcatenated - Get the number of string literal tokens that were 1507 /// concatenated in translation phase #6 to form this string literal. 1508 unsigned getNumConcatenated() const { return NumConcatenated; } 1509 1510 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1511 assert(TokNum < NumConcatenated && "Invalid tok number"); 1512 return TokLocs[TokNum]; 1513 } 1514 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1515 assert(TokNum < NumConcatenated && "Invalid tok number"); 1516 TokLocs[TokNum] = L; 1517 } 1518 1519 /// getLocationOfByte - Return a source location that points to the specified 1520 /// byte of this string literal. 1521 /// 1522 /// Strings are amazingly complex. They can be formed from multiple tokens 1523 /// and can have escape sequences in them in addition to the usual trigraph 1524 /// and escaped newline business. This routine handles this complexity. 1525 /// 1526 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1527 const LangOptions &Features, 1528 const TargetInfo &Target) const; 1529 1530 typedef const SourceLocation *tokloc_iterator; 1531 tokloc_iterator tokloc_begin() const { return TokLocs; } 1532 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1533 1534 SourceLocation getLocStart() const LLVM_READONLY { return TokLocs[0]; } 1535 SourceLocation getLocEnd() const LLVM_READONLY { 1536 return TokLocs[NumConcatenated - 1]; 1537 } 1538 1539 static bool classof(const Stmt *T) { 1540 return T->getStmtClass() == StringLiteralClass; 1541 } 1542 1543 // Iterators 1544 child_range children() { return child_range(); } 1545}; 1546 1547/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1548/// AST node is only formed if full location information is requested. 1549class ParenExpr : public Expr { 1550 SourceLocation L, R; 1551 Stmt *Val; 1552public: 1553 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1554 : Expr(ParenExprClass, val->getType(), 1555 val->getValueKind(), val->getObjectKind(), 1556 val->isTypeDependent(), val->isValueDependent(), 1557 val->isInstantiationDependent(), 1558 val->containsUnexpandedParameterPack()), 1559 L(l), R(r), Val(val) {} 1560 1561 /// \brief Construct an empty parenthesized expression. 1562 explicit ParenExpr(EmptyShell Empty) 1563 : Expr(ParenExprClass, Empty) { } 1564 1565 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1566 Expr *getSubExpr() { return cast<Expr>(Val); } 1567 void setSubExpr(Expr *E) { Val = E; } 1568 1569 SourceLocation getLocStart() const LLVM_READONLY { return L; } 1570 SourceLocation getLocEnd() const LLVM_READONLY { return R; } 1571 1572 /// \brief Get the location of the left parentheses '('. 1573 SourceLocation getLParen() const { return L; } 1574 void setLParen(SourceLocation Loc) { L = Loc; } 1575 1576 /// \brief Get the location of the right parentheses ')'. 1577 SourceLocation getRParen() const { return R; } 1578 void setRParen(SourceLocation Loc) { R = Loc; } 1579 1580 static bool classof(const Stmt *T) { 1581 return T->getStmtClass() == ParenExprClass; 1582 } 1583 1584 // Iterators 1585 child_range children() { return child_range(&Val, &Val+1); } 1586}; 1587 1588 1589/// UnaryOperator - This represents the unary-expression's (except sizeof and 1590/// alignof), the postinc/postdec operators from postfix-expression, and various 1591/// extensions. 1592/// 1593/// Notes on various nodes: 1594/// 1595/// Real/Imag - These return the real/imag part of a complex operand. If 1596/// applied to a non-complex value, the former returns its operand and the 1597/// later returns zero in the type of the operand. 1598/// 1599class UnaryOperator : public Expr { 1600public: 1601 typedef UnaryOperatorKind Opcode; 1602 1603private: 1604 unsigned Opc : 5; 1605 SourceLocation Loc; 1606 Stmt *Val; 1607public: 1608 1609 UnaryOperator(Expr *input, Opcode opc, QualType type, 1610 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1611 : Expr(UnaryOperatorClass, type, VK, OK, 1612 input->isTypeDependent() || type->isDependentType(), 1613 input->isValueDependent(), 1614 (input->isInstantiationDependent() || 1615 type->isInstantiationDependentType()), 1616 input->containsUnexpandedParameterPack()), 1617 Opc(opc), Loc(l), Val(input) {} 1618 1619 /// \brief Build an empty unary operator. 1620 explicit UnaryOperator(EmptyShell Empty) 1621 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1622 1623 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1624 void setOpcode(Opcode O) { Opc = O; } 1625 1626 Expr *getSubExpr() const { return cast<Expr>(Val); } 1627 void setSubExpr(Expr *E) { Val = E; } 1628 1629 /// getOperatorLoc - Return the location of the operator. 1630 SourceLocation getOperatorLoc() const { return Loc; } 1631 void setOperatorLoc(SourceLocation L) { Loc = L; } 1632 1633 /// isPostfix - Return true if this is a postfix operation, like x++. 1634 static bool isPostfix(Opcode Op) { 1635 return Op == UO_PostInc || Op == UO_PostDec; 1636 } 1637 1638 /// isPrefix - Return true if this is a prefix operation, like --x. 1639 static bool isPrefix(Opcode Op) { 1640 return Op == UO_PreInc || Op == UO_PreDec; 1641 } 1642 1643 bool isPrefix() const { return isPrefix(getOpcode()); } 1644 bool isPostfix() const { return isPostfix(getOpcode()); } 1645 1646 static bool isIncrementOp(Opcode Op) { 1647 return Op == UO_PreInc || Op == UO_PostInc; 1648 } 1649 bool isIncrementOp() const { 1650 return isIncrementOp(getOpcode()); 1651 } 1652 1653 static bool isDecrementOp(Opcode Op) { 1654 return Op == UO_PreDec || Op == UO_PostDec; 1655 } 1656 bool isDecrementOp() const { 1657 return isDecrementOp(getOpcode()); 1658 } 1659 1660 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1661 bool isIncrementDecrementOp() const { 1662 return isIncrementDecrementOp(getOpcode()); 1663 } 1664 1665 static bool isArithmeticOp(Opcode Op) { 1666 return Op >= UO_Plus && Op <= UO_LNot; 1667 } 1668 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1669 1670 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1671 /// corresponds to, e.g. "sizeof" or "[pre]++" 1672 static StringRef getOpcodeStr(Opcode Op); 1673 1674 /// \brief Retrieve the unary opcode that corresponds to the given 1675 /// overloaded operator. 1676 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1677 1678 /// \brief Retrieve the overloaded operator kind that corresponds to 1679 /// the given unary opcode. 1680 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1681 1682 SourceLocation getLocStart() const LLVM_READONLY { 1683 return isPostfix() ? Val->getLocStart() : Loc; 1684 } 1685 SourceLocation getLocEnd() const LLVM_READONLY { 1686 return isPostfix() ? Loc : Val->getLocEnd(); 1687 } 1688 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1689 1690 static bool classof(const Stmt *T) { 1691 return T->getStmtClass() == UnaryOperatorClass; 1692 } 1693 1694 // Iterators 1695 child_range children() { return child_range(&Val, &Val+1); } 1696}; 1697 1698/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1699/// offsetof(record-type, member-designator). For example, given: 1700/// @code 1701/// struct S { 1702/// float f; 1703/// double d; 1704/// }; 1705/// struct T { 1706/// int i; 1707/// struct S s[10]; 1708/// }; 1709/// @endcode 1710/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1711 1712class OffsetOfExpr : public Expr { 1713public: 1714 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1715 class OffsetOfNode { 1716 public: 1717 /// \brief The kind of offsetof node we have. 1718 enum Kind { 1719 /// \brief An index into an array. 1720 Array = 0x00, 1721 /// \brief A field. 1722 Field = 0x01, 1723 /// \brief A field in a dependent type, known only by its name. 1724 Identifier = 0x02, 1725 /// \brief An implicit indirection through a C++ base class, when the 1726 /// field found is in a base class. 1727 Base = 0x03 1728 }; 1729 1730 private: 1731 enum { MaskBits = 2, Mask = 0x03 }; 1732 1733 /// \brief The source range that covers this part of the designator. 1734 SourceRange Range; 1735 1736 /// \brief The data describing the designator, which comes in three 1737 /// different forms, depending on the lower two bits. 1738 /// - An unsigned index into the array of Expr*'s stored after this node 1739 /// in memory, for [constant-expression] designators. 1740 /// - A FieldDecl*, for references to a known field. 1741 /// - An IdentifierInfo*, for references to a field with a given name 1742 /// when the class type is dependent. 1743 /// - A CXXBaseSpecifier*, for references that look at a field in a 1744 /// base class. 1745 uintptr_t Data; 1746 1747 public: 1748 /// \brief Create an offsetof node that refers to an array element. 1749 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1750 SourceLocation RBracketLoc) 1751 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1752 1753 /// \brief Create an offsetof node that refers to a field. 1754 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1755 SourceLocation NameLoc) 1756 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1757 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1758 1759 /// \brief Create an offsetof node that refers to an identifier. 1760 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1761 SourceLocation NameLoc) 1762 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1763 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1764 1765 /// \brief Create an offsetof node that refers into a C++ base class. 1766 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1767 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1768 1769 /// \brief Determine what kind of offsetof node this is. 1770 Kind getKind() const { 1771 return static_cast<Kind>(Data & Mask); 1772 } 1773 1774 /// \brief For an array element node, returns the index into the array 1775 /// of expressions. 1776 unsigned getArrayExprIndex() const { 1777 assert(getKind() == Array); 1778 return Data >> 2; 1779 } 1780 1781 /// \brief For a field offsetof node, returns the field. 1782 FieldDecl *getField() const { 1783 assert(getKind() == Field); 1784 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1785 } 1786 1787 /// \brief For a field or identifier offsetof node, returns the name of 1788 /// the field. 1789 IdentifierInfo *getFieldName() const; 1790 1791 /// \brief For a base class node, returns the base specifier. 1792 CXXBaseSpecifier *getBase() const { 1793 assert(getKind() == Base); 1794 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1795 } 1796 1797 /// \brief Retrieve the source range that covers this offsetof node. 1798 /// 1799 /// For an array element node, the source range contains the locations of 1800 /// the square brackets. For a field or identifier node, the source range 1801 /// contains the location of the period (if there is one) and the 1802 /// identifier. 1803 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1804 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); } 1805 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); } 1806 }; 1807 1808private: 1809 1810 SourceLocation OperatorLoc, RParenLoc; 1811 // Base type; 1812 TypeSourceInfo *TSInfo; 1813 // Number of sub-components (i.e. instances of OffsetOfNode). 1814 unsigned NumComps; 1815 // Number of sub-expressions (i.e. array subscript expressions). 1816 unsigned NumExprs; 1817 1818 OffsetOfExpr(ASTContext &C, QualType type, 1819 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1820 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs, 1821 SourceLocation RParenLoc); 1822 1823 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1824 : Expr(OffsetOfExprClass, EmptyShell()), 1825 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1826 1827public: 1828 1829 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1830 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1831 ArrayRef<OffsetOfNode> comps, 1832 ArrayRef<Expr*> exprs, SourceLocation RParenLoc); 1833 1834 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1835 unsigned NumComps, unsigned NumExprs); 1836 1837 /// getOperatorLoc - Return the location of the operator. 1838 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1839 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1840 1841 /// \brief Return the location of the right parentheses. 1842 SourceLocation getRParenLoc() const { return RParenLoc; } 1843 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1844 1845 TypeSourceInfo *getTypeSourceInfo() const { 1846 return TSInfo; 1847 } 1848 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1849 TSInfo = tsi; 1850 } 1851 1852 const OffsetOfNode &getComponent(unsigned Idx) const { 1853 assert(Idx < NumComps && "Subscript out of range"); 1854 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1855 } 1856 1857 void setComponent(unsigned Idx, OffsetOfNode ON) { 1858 assert(Idx < NumComps && "Subscript out of range"); 1859 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1860 } 1861 1862 unsigned getNumComponents() const { 1863 return NumComps; 1864 } 1865 1866 Expr* getIndexExpr(unsigned Idx) { 1867 assert(Idx < NumExprs && "Subscript out of range"); 1868 return reinterpret_cast<Expr **>( 1869 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1870 } 1871 const Expr *getIndexExpr(unsigned Idx) const { 1872 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1873 } 1874 1875 void setIndexExpr(unsigned Idx, Expr* E) { 1876 assert(Idx < NumComps && "Subscript out of range"); 1877 reinterpret_cast<Expr **>( 1878 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1879 } 1880 1881 unsigned getNumExpressions() const { 1882 return NumExprs; 1883 } 1884 1885 SourceLocation getLocStart() const LLVM_READONLY { return OperatorLoc; } 1886 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 1887 1888 static bool classof(const Stmt *T) { 1889 return T->getStmtClass() == OffsetOfExprClass; 1890 } 1891 1892 // Iterators 1893 child_range children() { 1894 Stmt **begin = 1895 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1896 + NumComps); 1897 return child_range(begin, begin + NumExprs); 1898 } 1899}; 1900 1901/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1902/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1903/// vec_step (OpenCL 1.1 6.11.12). 1904class UnaryExprOrTypeTraitExpr : public Expr { 1905 union { 1906 TypeSourceInfo *Ty; 1907 Stmt *Ex; 1908 } Argument; 1909 SourceLocation OpLoc, RParenLoc; 1910 1911public: 1912 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1913 QualType resultType, SourceLocation op, 1914 SourceLocation rp) : 1915 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1916 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1917 // Value-dependent if the argument is type-dependent. 1918 TInfo->getType()->isDependentType(), 1919 TInfo->getType()->isInstantiationDependentType(), 1920 TInfo->getType()->containsUnexpandedParameterPack()), 1921 OpLoc(op), RParenLoc(rp) { 1922 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1923 UnaryExprOrTypeTraitExprBits.IsType = true; 1924 Argument.Ty = TInfo; 1925 } 1926 1927 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1928 QualType resultType, SourceLocation op, 1929 SourceLocation rp) : 1930 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1931 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1932 // Value-dependent if the argument is type-dependent. 1933 E->isTypeDependent(), 1934 E->isInstantiationDependent(), 1935 E->containsUnexpandedParameterPack()), 1936 OpLoc(op), RParenLoc(rp) { 1937 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1938 UnaryExprOrTypeTraitExprBits.IsType = false; 1939 Argument.Ex = E; 1940 } 1941 1942 /// \brief Construct an empty sizeof/alignof expression. 1943 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1944 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1945 1946 UnaryExprOrTypeTrait getKind() const { 1947 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1948 } 1949 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1950 1951 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1952 QualType getArgumentType() const { 1953 return getArgumentTypeInfo()->getType(); 1954 } 1955 TypeSourceInfo *getArgumentTypeInfo() const { 1956 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1957 return Argument.Ty; 1958 } 1959 Expr *getArgumentExpr() { 1960 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1961 return static_cast<Expr*>(Argument.Ex); 1962 } 1963 const Expr *getArgumentExpr() const { 1964 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1965 } 1966 1967 void setArgument(Expr *E) { 1968 Argument.Ex = E; 1969 UnaryExprOrTypeTraitExprBits.IsType = false; 1970 } 1971 void setArgument(TypeSourceInfo *TInfo) { 1972 Argument.Ty = TInfo; 1973 UnaryExprOrTypeTraitExprBits.IsType = true; 1974 } 1975 1976 /// Gets the argument type, or the type of the argument expression, whichever 1977 /// is appropriate. 1978 QualType getTypeOfArgument() const { 1979 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1980 } 1981 1982 SourceLocation getOperatorLoc() const { return OpLoc; } 1983 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1984 1985 SourceLocation getRParenLoc() const { return RParenLoc; } 1986 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1987 1988 SourceLocation getLocStart() const LLVM_READONLY { return OpLoc; } 1989 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 1990 1991 static bool classof(const Stmt *T) { 1992 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1993 } 1994 1995 // Iterators 1996 child_range children(); 1997}; 1998 1999//===----------------------------------------------------------------------===// 2000// Postfix Operators. 2001//===----------------------------------------------------------------------===// 2002 2003/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 2004class ArraySubscriptExpr : public Expr { 2005 enum { LHS, RHS, END_EXPR=2 }; 2006 Stmt* SubExprs[END_EXPR]; 2007 SourceLocation RBracketLoc; 2008public: 2009 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 2010 ExprValueKind VK, ExprObjectKind OK, 2011 SourceLocation rbracketloc) 2012 : Expr(ArraySubscriptExprClass, t, VK, OK, 2013 lhs->isTypeDependent() || rhs->isTypeDependent(), 2014 lhs->isValueDependent() || rhs->isValueDependent(), 2015 (lhs->isInstantiationDependent() || 2016 rhs->isInstantiationDependent()), 2017 (lhs->containsUnexpandedParameterPack() || 2018 rhs->containsUnexpandedParameterPack())), 2019 RBracketLoc(rbracketloc) { 2020 SubExprs[LHS] = lhs; 2021 SubExprs[RHS] = rhs; 2022 } 2023 2024 /// \brief Create an empty array subscript expression. 2025 explicit ArraySubscriptExpr(EmptyShell Shell) 2026 : Expr(ArraySubscriptExprClass, Shell) { } 2027 2028 /// An array access can be written A[4] or 4[A] (both are equivalent). 2029 /// - getBase() and getIdx() always present the normalized view: A[4]. 2030 /// In this case getBase() returns "A" and getIdx() returns "4". 2031 /// - getLHS() and getRHS() present the syntactic view. e.g. for 2032 /// 4[A] getLHS() returns "4". 2033 /// Note: Because vector element access is also written A[4] we must 2034 /// predicate the format conversion in getBase and getIdx only on the 2035 /// the type of the RHS, as it is possible for the LHS to be a vector of 2036 /// integer type 2037 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 2038 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2039 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2040 2041 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 2042 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2043 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2044 2045 Expr *getBase() { 2046 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2047 } 2048 2049 const Expr *getBase() const { 2050 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2051 } 2052 2053 Expr *getIdx() { 2054 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2055 } 2056 2057 const Expr *getIdx() const { 2058 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2059 } 2060 2061 SourceLocation getLocStart() const LLVM_READONLY { 2062 return getLHS()->getLocStart(); 2063 } 2064 SourceLocation getLocEnd() const LLVM_READONLY { return RBracketLoc; } 2065 2066 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2067 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2068 2069 SourceLocation getExprLoc() const LLVM_READONLY { 2070 return getBase()->getExprLoc(); 2071 } 2072 2073 static bool classof(const Stmt *T) { 2074 return T->getStmtClass() == ArraySubscriptExprClass; 2075 } 2076 2077 // Iterators 2078 child_range children() { 2079 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2080 } 2081}; 2082 2083 2084/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2085/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2086/// while its subclasses may represent alternative syntax that (semantically) 2087/// results in a function call. For example, CXXOperatorCallExpr is 2088/// a subclass for overloaded operator calls that use operator syntax, e.g., 2089/// "str1 + str2" to resolve to a function call. 2090class CallExpr : public Expr { 2091 enum { FN=0, PREARGS_START=1 }; 2092 Stmt **SubExprs; 2093 unsigned NumArgs; 2094 SourceLocation RParenLoc; 2095 2096protected: 2097 // These versions of the constructor are for derived classes. 2098 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2099 ArrayRef<Expr*> args, QualType t, ExprValueKind VK, 2100 SourceLocation rparenloc); 2101 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2102 2103 Stmt *getPreArg(unsigned i) { 2104 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2105 return SubExprs[PREARGS_START+i]; 2106 } 2107 const Stmt *getPreArg(unsigned i) const { 2108 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2109 return SubExprs[PREARGS_START+i]; 2110 } 2111 void setPreArg(unsigned i, Stmt *PreArg) { 2112 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2113 SubExprs[PREARGS_START+i] = PreArg; 2114 } 2115 2116 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2117 2118public: 2119 CallExpr(ASTContext& C, Expr *fn, ArrayRef<Expr*> args, QualType t, 2120 ExprValueKind VK, SourceLocation rparenloc); 2121 2122 /// \brief Build an empty call expression. 2123 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2124 2125 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2126 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2127 void setCallee(Expr *F) { SubExprs[FN] = F; } 2128 2129 Decl *getCalleeDecl(); 2130 const Decl *getCalleeDecl() const { 2131 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2132 } 2133 2134 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2135 FunctionDecl *getDirectCallee(); 2136 const FunctionDecl *getDirectCallee() const { 2137 return const_cast<CallExpr*>(this)->getDirectCallee(); 2138 } 2139 2140 /// getNumArgs - Return the number of actual arguments to this call. 2141 /// 2142 unsigned getNumArgs() const { return NumArgs; } 2143 2144 /// \brief Retrieve the call arguments. 2145 Expr **getArgs() { 2146 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2147 } 2148 const Expr *const *getArgs() const { 2149 return const_cast<CallExpr*>(this)->getArgs(); 2150 } 2151 2152 /// getArg - Return the specified argument. 2153 Expr *getArg(unsigned Arg) { 2154 assert(Arg < NumArgs && "Arg access out of range!"); 2155 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2156 } 2157 const Expr *getArg(unsigned Arg) const { 2158 assert(Arg < NumArgs && "Arg access out of range!"); 2159 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2160 } 2161 2162 /// setArg - Set the specified argument. 2163 void setArg(unsigned Arg, Expr *ArgExpr) { 2164 assert(Arg < NumArgs && "Arg access out of range!"); 2165 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2166 } 2167 2168 /// setNumArgs - This changes the number of arguments present in this call. 2169 /// Any orphaned expressions are deleted by this, and any new operands are set 2170 /// to null. 2171 void setNumArgs(ASTContext& C, unsigned NumArgs); 2172 2173 typedef ExprIterator arg_iterator; 2174 typedef ConstExprIterator const_arg_iterator; 2175 2176 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2177 arg_iterator arg_end() { 2178 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2179 } 2180 const_arg_iterator arg_begin() const { 2181 return SubExprs+PREARGS_START+getNumPreArgs(); 2182 } 2183 const_arg_iterator arg_end() const { 2184 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2185 } 2186 2187 /// getNumCommas - Return the number of commas that must have been present in 2188 /// this function call. 2189 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2190 2191 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2192 /// not, return 0. 2193 unsigned isBuiltinCall() const; 2194 2195 /// getCallReturnType - Get the return type of the call expr. This is not 2196 /// always the type of the expr itself, if the return type is a reference 2197 /// type. 2198 QualType getCallReturnType() const; 2199 2200 SourceLocation getRParenLoc() const { return RParenLoc; } 2201 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2202 2203 SourceLocation getLocStart() const LLVM_READONLY; 2204 SourceLocation getLocEnd() const LLVM_READONLY; 2205 2206 static bool classof(const Stmt *T) { 2207 return T->getStmtClass() >= firstCallExprConstant && 2208 T->getStmtClass() <= lastCallExprConstant; 2209 } 2210 2211 // Iterators 2212 child_range children() { 2213 return child_range(&SubExprs[0], 2214 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2215 } 2216}; 2217 2218/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2219/// 2220class MemberExpr : public Expr { 2221 /// Extra data stored in some member expressions. 2222 struct MemberNameQualifier { 2223 /// \brief The nested-name-specifier that qualifies the name, including 2224 /// source-location information. 2225 NestedNameSpecifierLoc QualifierLoc; 2226 2227 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2228 /// name qualifiers. 2229 DeclAccessPair FoundDecl; 2230 }; 2231 2232 /// Base - the expression for the base pointer or structure references. In 2233 /// X.F, this is "X". 2234 Stmt *Base; 2235 2236 /// MemberDecl - This is the decl being referenced by the field/member name. 2237 /// In X.F, this is the decl referenced by F. 2238 ValueDecl *MemberDecl; 2239 2240 /// MemberDNLoc - Provides source/type location info for the 2241 /// declaration name embedded in MemberDecl. 2242 DeclarationNameLoc MemberDNLoc; 2243 2244 /// MemberLoc - This is the location of the member name. 2245 SourceLocation MemberLoc; 2246 2247 /// IsArrow - True if this is "X->F", false if this is "X.F". 2248 bool IsArrow : 1; 2249 2250 /// \brief True if this member expression used a nested-name-specifier to 2251 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2252 /// declaration. When true, a MemberNameQualifier 2253 /// structure is allocated immediately after the MemberExpr. 2254 bool HasQualifierOrFoundDecl : 1; 2255 2256 /// \brief True if this member expression specified a template keyword 2257 /// and/or a template argument list explicitly, e.g., x->f<int>, 2258 /// x->template f, x->template f<int>. 2259 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2260 /// TemplateArguments (if any) are allocated immediately after 2261 /// the MemberExpr or, if the member expression also has a qualifier, 2262 /// after the MemberNameQualifier structure. 2263 bool HasTemplateKWAndArgsInfo : 1; 2264 2265 /// \brief True if this member expression refers to a method that 2266 /// was resolved from an overloaded set having size greater than 1. 2267 bool HadMultipleCandidates : 1; 2268 2269 /// \brief Retrieve the qualifier that preceded the member name, if any. 2270 MemberNameQualifier *getMemberQualifier() { 2271 assert(HasQualifierOrFoundDecl); 2272 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2273 } 2274 2275 /// \brief Retrieve the qualifier that preceded the member name, if any. 2276 const MemberNameQualifier *getMemberQualifier() const { 2277 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2278 } 2279 2280public: 2281 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2282 const DeclarationNameInfo &NameInfo, QualType ty, 2283 ExprValueKind VK, ExprObjectKind OK) 2284 : Expr(MemberExprClass, ty, VK, OK, 2285 base->isTypeDependent(), 2286 base->isValueDependent(), 2287 base->isInstantiationDependent(), 2288 base->containsUnexpandedParameterPack()), 2289 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2290 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2291 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2292 HadMultipleCandidates(false) { 2293 assert(memberdecl->getDeclName() == NameInfo.getName()); 2294 } 2295 2296 // NOTE: this constructor should be used only when it is known that 2297 // the member name can not provide additional syntactic info 2298 // (i.e., source locations for C++ operator names or type source info 2299 // for constructors, destructors and conversion operators). 2300 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2301 SourceLocation l, QualType ty, 2302 ExprValueKind VK, ExprObjectKind OK) 2303 : Expr(MemberExprClass, ty, VK, OK, 2304 base->isTypeDependent(), base->isValueDependent(), 2305 base->isInstantiationDependent(), 2306 base->containsUnexpandedParameterPack()), 2307 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2308 IsArrow(isarrow), 2309 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2310 HadMultipleCandidates(false) {} 2311 2312 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2313 NestedNameSpecifierLoc QualifierLoc, 2314 SourceLocation TemplateKWLoc, 2315 ValueDecl *memberdecl, DeclAccessPair founddecl, 2316 DeclarationNameInfo MemberNameInfo, 2317 const TemplateArgumentListInfo *targs, 2318 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2319 2320 void setBase(Expr *E) { Base = E; } 2321 Expr *getBase() const { return cast<Expr>(Base); } 2322 2323 /// \brief Retrieve the member declaration to which this expression refers. 2324 /// 2325 /// The returned declaration will either be a FieldDecl or (in C++) 2326 /// a CXXMethodDecl. 2327 ValueDecl *getMemberDecl() const { return MemberDecl; } 2328 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2329 2330 /// \brief Retrieves the declaration found by lookup. 2331 DeclAccessPair getFoundDecl() const { 2332 if (!HasQualifierOrFoundDecl) 2333 return DeclAccessPair::make(getMemberDecl(), 2334 getMemberDecl()->getAccess()); 2335 return getMemberQualifier()->FoundDecl; 2336 } 2337 2338 /// \brief Determines whether this member expression actually had 2339 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2340 /// x->Base::foo. 2341 bool hasQualifier() const { return getQualifier() != 0; } 2342 2343 /// \brief If the member name was qualified, retrieves the 2344 /// nested-name-specifier that precedes the member name. Otherwise, returns 2345 /// NULL. 2346 NestedNameSpecifier *getQualifier() const { 2347 if (!HasQualifierOrFoundDecl) 2348 return 0; 2349 2350 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2351 } 2352 2353 /// \brief If the member name was qualified, retrieves the 2354 /// nested-name-specifier that precedes the member name, with source-location 2355 /// information. 2356 NestedNameSpecifierLoc getQualifierLoc() const { 2357 if (!hasQualifier()) 2358 return NestedNameSpecifierLoc(); 2359 2360 return getMemberQualifier()->QualifierLoc; 2361 } 2362 2363 /// \brief Return the optional template keyword and arguments info. 2364 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2365 if (!HasTemplateKWAndArgsInfo) 2366 return 0; 2367 2368 if (!HasQualifierOrFoundDecl) 2369 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2370 2371 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2372 getMemberQualifier() + 1); 2373 } 2374 2375 /// \brief Return the optional template keyword and arguments info. 2376 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2377 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2378 } 2379 2380 /// \brief Retrieve the location of the template keyword preceding 2381 /// the member name, if any. 2382 SourceLocation getTemplateKeywordLoc() const { 2383 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2384 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2385 } 2386 2387 /// \brief Retrieve the location of the left angle bracket starting the 2388 /// explicit template argument list following the member name, if any. 2389 SourceLocation getLAngleLoc() const { 2390 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2391 return getTemplateKWAndArgsInfo()->LAngleLoc; 2392 } 2393 2394 /// \brief Retrieve the location of the right angle bracket ending the 2395 /// explicit template argument list following the member name, if any. 2396 SourceLocation getRAngleLoc() const { 2397 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2398 return getTemplateKWAndArgsInfo()->RAngleLoc; 2399 } 2400 2401 /// Determines whether the member name was preceded by the template keyword. 2402 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2403 2404 /// \brief Determines whether the member name was followed by an 2405 /// explicit template argument list. 2406 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2407 2408 /// \brief Copies the template arguments (if present) into the given 2409 /// structure. 2410 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2411 if (hasExplicitTemplateArgs()) 2412 getExplicitTemplateArgs().copyInto(List); 2413 } 2414 2415 /// \brief Retrieve the explicit template argument list that 2416 /// follow the member template name. This must only be called on an 2417 /// expression with explicit template arguments. 2418 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2419 assert(hasExplicitTemplateArgs()); 2420 return *getTemplateKWAndArgsInfo(); 2421 } 2422 2423 /// \brief Retrieve the explicit template argument list that 2424 /// followed the member template name. This must only be called on 2425 /// an expression with explicit template arguments. 2426 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2427 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2428 } 2429 2430 /// \brief Retrieves the optional explicit template arguments. 2431 /// This points to the same data as getExplicitTemplateArgs(), but 2432 /// returns null if there are no explicit template arguments. 2433 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2434 if (!hasExplicitTemplateArgs()) return 0; 2435 return &getExplicitTemplateArgs(); 2436 } 2437 2438 /// \brief Retrieve the template arguments provided as part of this 2439 /// template-id. 2440 const TemplateArgumentLoc *getTemplateArgs() const { 2441 if (!hasExplicitTemplateArgs()) 2442 return 0; 2443 2444 return getExplicitTemplateArgs().getTemplateArgs(); 2445 } 2446 2447 /// \brief Retrieve the number of template arguments provided as part of this 2448 /// template-id. 2449 unsigned getNumTemplateArgs() const { 2450 if (!hasExplicitTemplateArgs()) 2451 return 0; 2452 2453 return getExplicitTemplateArgs().NumTemplateArgs; 2454 } 2455 2456 /// \brief Retrieve the member declaration name info. 2457 DeclarationNameInfo getMemberNameInfo() const { 2458 return DeclarationNameInfo(MemberDecl->getDeclName(), 2459 MemberLoc, MemberDNLoc); 2460 } 2461 2462 bool isArrow() const { return IsArrow; } 2463 void setArrow(bool A) { IsArrow = A; } 2464 2465 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2466 /// location of 'F'. 2467 SourceLocation getMemberLoc() const { return MemberLoc; } 2468 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2469 2470 SourceLocation getLocStart() const LLVM_READONLY; 2471 SourceLocation getLocEnd() const LLVM_READONLY; 2472 2473 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2474 2475 /// \brief Determine whether the base of this explicit is implicit. 2476 bool isImplicitAccess() const { 2477 return getBase() && getBase()->isImplicitCXXThis(); 2478 } 2479 2480 /// \brief Returns true if this member expression refers to a method that 2481 /// was resolved from an overloaded set having size greater than 1. 2482 bool hadMultipleCandidates() const { 2483 return HadMultipleCandidates; 2484 } 2485 /// \brief Sets the flag telling whether this expression refers to 2486 /// a method that was resolved from an overloaded set having size 2487 /// greater than 1. 2488 void setHadMultipleCandidates(bool V = true) { 2489 HadMultipleCandidates = V; 2490 } 2491 2492 static bool classof(const Stmt *T) { 2493 return T->getStmtClass() == MemberExprClass; 2494 } 2495 2496 // Iterators 2497 child_range children() { return child_range(&Base, &Base+1); } 2498 2499 friend class ASTReader; 2500 friend class ASTStmtWriter; 2501}; 2502 2503/// CompoundLiteralExpr - [C99 6.5.2.5] 2504/// 2505class CompoundLiteralExpr : public Expr { 2506 /// LParenLoc - If non-null, this is the location of the left paren in a 2507 /// compound literal like "(int){4}". This can be null if this is a 2508 /// synthesized compound expression. 2509 SourceLocation LParenLoc; 2510 2511 /// The type as written. This can be an incomplete array type, in 2512 /// which case the actual expression type will be different. 2513 /// The int part of the pair stores whether this expr is file scope. 2514 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2515 Stmt *Init; 2516public: 2517 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2518 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2519 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2520 tinfo->getType()->isDependentType(), 2521 init->isValueDependent(), 2522 (init->isInstantiationDependent() || 2523 tinfo->getType()->isInstantiationDependentType()), 2524 init->containsUnexpandedParameterPack()), 2525 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2526 2527 /// \brief Construct an empty compound literal. 2528 explicit CompoundLiteralExpr(EmptyShell Empty) 2529 : Expr(CompoundLiteralExprClass, Empty) { } 2530 2531 const Expr *getInitializer() const { return cast<Expr>(Init); } 2532 Expr *getInitializer() { return cast<Expr>(Init); } 2533 void setInitializer(Expr *E) { Init = E; } 2534 2535 bool isFileScope() const { return TInfoAndScope.getInt(); } 2536 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2537 2538 SourceLocation getLParenLoc() const { return LParenLoc; } 2539 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2540 2541 TypeSourceInfo *getTypeSourceInfo() const { 2542 return TInfoAndScope.getPointer(); 2543 } 2544 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2545 TInfoAndScope.setPointer(tinfo); 2546 } 2547 2548 SourceLocation getLocStart() const LLVM_READONLY { 2549 // FIXME: Init should never be null. 2550 if (!Init) 2551 return SourceLocation(); 2552 if (LParenLoc.isInvalid()) 2553 return Init->getLocStart(); 2554 return LParenLoc; 2555 } 2556 SourceLocation getLocEnd() const LLVM_READONLY { 2557 // FIXME: Init should never be null. 2558 if (!Init) 2559 return SourceLocation(); 2560 return Init->getLocEnd(); 2561 } 2562 2563 static bool classof(const Stmt *T) { 2564 return T->getStmtClass() == CompoundLiteralExprClass; 2565 } 2566 2567 // Iterators 2568 child_range children() { return child_range(&Init, &Init+1); } 2569}; 2570 2571/// CastExpr - Base class for type casts, including both implicit 2572/// casts (ImplicitCastExpr) and explicit casts that have some 2573/// representation in the source code (ExplicitCastExpr's derived 2574/// classes). 2575class CastExpr : public Expr { 2576public: 2577 typedef clang::CastKind CastKind; 2578 2579private: 2580 Stmt *Op; 2581 2582 void CheckCastConsistency() const; 2583 2584 const CXXBaseSpecifier * const *path_buffer() const { 2585 return const_cast<CastExpr*>(this)->path_buffer(); 2586 } 2587 CXXBaseSpecifier **path_buffer(); 2588 2589 void setBasePathSize(unsigned basePathSize) { 2590 CastExprBits.BasePathSize = basePathSize; 2591 assert(CastExprBits.BasePathSize == basePathSize && 2592 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2593 } 2594 2595protected: 2596 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2597 const CastKind kind, Expr *op, unsigned BasePathSize) : 2598 Expr(SC, ty, VK, OK_Ordinary, 2599 // Cast expressions are type-dependent if the type is 2600 // dependent (C++ [temp.dep.expr]p3). 2601 ty->isDependentType(), 2602 // Cast expressions are value-dependent if the type is 2603 // dependent or if the subexpression is value-dependent. 2604 ty->isDependentType() || (op && op->isValueDependent()), 2605 (ty->isInstantiationDependentType() || 2606 (op && op->isInstantiationDependent())), 2607 (ty->containsUnexpandedParameterPack() || 2608 op->containsUnexpandedParameterPack())), 2609 Op(op) { 2610 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2611 CastExprBits.Kind = kind; 2612 setBasePathSize(BasePathSize); 2613#ifndef NDEBUG 2614 CheckCastConsistency(); 2615#endif 2616 } 2617 2618 /// \brief Construct an empty cast. 2619 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2620 : Expr(SC, Empty) { 2621 setBasePathSize(BasePathSize); 2622 } 2623 2624public: 2625 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2626 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2627 const char *getCastKindName() const; 2628 2629 Expr *getSubExpr() { return cast<Expr>(Op); } 2630 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2631 void setSubExpr(Expr *E) { Op = E; } 2632 2633 /// \brief Retrieve the cast subexpression as it was written in the source 2634 /// code, looking through any implicit casts or other intermediate nodes 2635 /// introduced by semantic analysis. 2636 Expr *getSubExprAsWritten(); 2637 const Expr *getSubExprAsWritten() const { 2638 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2639 } 2640 2641 typedef CXXBaseSpecifier **path_iterator; 2642 typedef const CXXBaseSpecifier * const *path_const_iterator; 2643 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2644 unsigned path_size() const { return CastExprBits.BasePathSize; } 2645 path_iterator path_begin() { return path_buffer(); } 2646 path_iterator path_end() { return path_buffer() + path_size(); } 2647 path_const_iterator path_begin() const { return path_buffer(); } 2648 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2649 2650 void setCastPath(const CXXCastPath &Path); 2651 2652 static bool classof(const Stmt *T) { 2653 return T->getStmtClass() >= firstCastExprConstant && 2654 T->getStmtClass() <= lastCastExprConstant; 2655 } 2656 2657 // Iterators 2658 child_range children() { return child_range(&Op, &Op+1); } 2659}; 2660 2661/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2662/// conversions, which have no direct representation in the original 2663/// source code. For example: converting T[]->T*, void f()->void 2664/// (*f)(), float->double, short->int, etc. 2665/// 2666/// In C, implicit casts always produce rvalues. However, in C++, an 2667/// implicit cast whose result is being bound to a reference will be 2668/// an lvalue or xvalue. For example: 2669/// 2670/// @code 2671/// class Base { }; 2672/// class Derived : public Base { }; 2673/// Derived &&ref(); 2674/// void f(Derived d) { 2675/// Base& b = d; // initializer is an ImplicitCastExpr 2676/// // to an lvalue of type Base 2677/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2678/// // to an xvalue of type Base 2679/// } 2680/// @endcode 2681class ImplicitCastExpr : public CastExpr { 2682private: 2683 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2684 unsigned BasePathLength, ExprValueKind VK) 2685 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2686 } 2687 2688 /// \brief Construct an empty implicit cast. 2689 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2690 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2691 2692public: 2693 enum OnStack_t { OnStack }; 2694 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2695 ExprValueKind VK) 2696 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2697 } 2698 2699 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2700 CastKind Kind, Expr *Operand, 2701 const CXXCastPath *BasePath, 2702 ExprValueKind Cat); 2703 2704 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2705 2706 SourceLocation getLocStart() const LLVM_READONLY { 2707 return getSubExpr()->getLocStart(); 2708 } 2709 SourceLocation getLocEnd() const LLVM_READONLY { 2710 return getSubExpr()->getLocEnd(); 2711 } 2712 2713 static bool classof(const Stmt *T) { 2714 return T->getStmtClass() == ImplicitCastExprClass; 2715 } 2716}; 2717 2718inline Expr *Expr::IgnoreImpCasts() { 2719 Expr *e = this; 2720 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2721 e = ice->getSubExpr(); 2722 return e; 2723} 2724 2725/// ExplicitCastExpr - An explicit cast written in the source 2726/// code. 2727/// 2728/// This class is effectively an abstract class, because it provides 2729/// the basic representation of an explicitly-written cast without 2730/// specifying which kind of cast (C cast, functional cast, static 2731/// cast, etc.) was written; specific derived classes represent the 2732/// particular style of cast and its location information. 2733/// 2734/// Unlike implicit casts, explicit cast nodes have two different 2735/// types: the type that was written into the source code, and the 2736/// actual type of the expression as determined by semantic 2737/// analysis. These types may differ slightly. For example, in C++ one 2738/// can cast to a reference type, which indicates that the resulting 2739/// expression will be an lvalue or xvalue. The reference type, however, 2740/// will not be used as the type of the expression. 2741class ExplicitCastExpr : public CastExpr { 2742 /// TInfo - Source type info for the (written) type 2743 /// this expression is casting to. 2744 TypeSourceInfo *TInfo; 2745 2746protected: 2747 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2748 CastKind kind, Expr *op, unsigned PathSize, 2749 TypeSourceInfo *writtenTy) 2750 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2751 2752 /// \brief Construct an empty explicit cast. 2753 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2754 : CastExpr(SC, Shell, PathSize) { } 2755 2756public: 2757 /// getTypeInfoAsWritten - Returns the type source info for the type 2758 /// that this expression is casting to. 2759 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2760 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2761 2762 /// getTypeAsWritten - Returns the type that this expression is 2763 /// casting to, as written in the source code. 2764 QualType getTypeAsWritten() const { return TInfo->getType(); } 2765 2766 static bool classof(const Stmt *T) { 2767 return T->getStmtClass() >= firstExplicitCastExprConstant && 2768 T->getStmtClass() <= lastExplicitCastExprConstant; 2769 } 2770}; 2771 2772/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2773/// cast in C++ (C++ [expr.cast]), which uses the syntax 2774/// (Type)expr. For example: @c (int)f. 2775class CStyleCastExpr : public ExplicitCastExpr { 2776 SourceLocation LPLoc; // the location of the left paren 2777 SourceLocation RPLoc; // the location of the right paren 2778 2779 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2780 unsigned PathSize, TypeSourceInfo *writtenTy, 2781 SourceLocation l, SourceLocation r) 2782 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2783 writtenTy), LPLoc(l), RPLoc(r) {} 2784 2785 /// \brief Construct an empty C-style explicit cast. 2786 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2787 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2788 2789public: 2790 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2791 ExprValueKind VK, CastKind K, 2792 Expr *Op, const CXXCastPath *BasePath, 2793 TypeSourceInfo *WrittenTy, SourceLocation L, 2794 SourceLocation R); 2795 2796 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2797 2798 SourceLocation getLParenLoc() const { return LPLoc; } 2799 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2800 2801 SourceLocation getRParenLoc() const { return RPLoc; } 2802 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2803 2804 SourceLocation getLocStart() const LLVM_READONLY { return LPLoc; } 2805 SourceLocation getLocEnd() const LLVM_READONLY { 2806 return getSubExpr()->getLocEnd(); 2807 } 2808 2809 static bool classof(const Stmt *T) { 2810 return T->getStmtClass() == CStyleCastExprClass; 2811 } 2812}; 2813 2814/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2815/// 2816/// This expression node kind describes a builtin binary operation, 2817/// such as "x + y" for integer values "x" and "y". The operands will 2818/// already have been converted to appropriate types (e.g., by 2819/// performing promotions or conversions). 2820/// 2821/// In C++, where operators may be overloaded, a different kind of 2822/// expression node (CXXOperatorCallExpr) is used to express the 2823/// invocation of an overloaded operator with operator syntax. Within 2824/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2825/// used to store an expression "x + y" depends on the subexpressions 2826/// for x and y. If neither x or y is type-dependent, and the "+" 2827/// operator resolves to a built-in operation, BinaryOperator will be 2828/// used to express the computation (x and y may still be 2829/// value-dependent). If either x or y is type-dependent, or if the 2830/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2831/// be used to express the computation. 2832class BinaryOperator : public Expr { 2833public: 2834 typedef BinaryOperatorKind Opcode; 2835 2836private: 2837 unsigned Opc : 6; 2838 2839 // Records the FP_CONTRACT pragma status at the point that this binary 2840 // operator was parsed. This bit is only meaningful for operations on 2841 // floating point types. For all other types it should default to 2842 // false. 2843 unsigned FPContractable : 1; 2844 SourceLocation OpLoc; 2845 2846 enum { LHS, RHS, END_EXPR }; 2847 Stmt* SubExprs[END_EXPR]; 2848public: 2849 2850 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2851 ExprValueKind VK, ExprObjectKind OK, 2852 SourceLocation opLoc, bool fpContractable) 2853 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2854 lhs->isTypeDependent() || rhs->isTypeDependent(), 2855 lhs->isValueDependent() || rhs->isValueDependent(), 2856 (lhs->isInstantiationDependent() || 2857 rhs->isInstantiationDependent()), 2858 (lhs->containsUnexpandedParameterPack() || 2859 rhs->containsUnexpandedParameterPack())), 2860 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) { 2861 SubExprs[LHS] = lhs; 2862 SubExprs[RHS] = rhs; 2863 assert(!isCompoundAssignmentOp() && 2864 "Use ArithAssignBinaryOperator for compound assignments"); 2865 } 2866 2867 /// \brief Construct an empty binary operator. 2868 explicit BinaryOperator(EmptyShell Empty) 2869 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2870 2871 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2872 SourceLocation getOperatorLoc() const { return OpLoc; } 2873 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2874 2875 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2876 void setOpcode(Opcode O) { Opc = O; } 2877 2878 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2879 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2880 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2881 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2882 2883 SourceLocation getLocStart() const LLVM_READONLY { 2884 return getLHS()->getLocStart(); 2885 } 2886 SourceLocation getLocEnd() const LLVM_READONLY { 2887 return getRHS()->getLocEnd(); 2888 } 2889 2890 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2891 /// corresponds to, e.g. "<<=". 2892 static StringRef getOpcodeStr(Opcode Op); 2893 2894 StringRef getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2895 2896 /// \brief Retrieve the binary opcode that corresponds to the given 2897 /// overloaded operator. 2898 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2899 2900 /// \brief Retrieve the overloaded operator kind that corresponds to 2901 /// the given binary opcode. 2902 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2903 2904 /// predicates to categorize the respective opcodes. 2905 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2906 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2907 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2908 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2909 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2910 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2911 2912 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2913 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2914 2915 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2916 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2917 2918 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2919 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2920 2921 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2922 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2923 2924 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2925 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2926 2927 static bool isAssignmentOp(Opcode Opc) { 2928 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2929 } 2930 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2931 2932 static bool isCompoundAssignmentOp(Opcode Opc) { 2933 return Opc > BO_Assign && Opc <= BO_OrAssign; 2934 } 2935 bool isCompoundAssignmentOp() const { 2936 return isCompoundAssignmentOp(getOpcode()); 2937 } 2938 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2939 assert(isCompoundAssignmentOp(Opc)); 2940 if (Opc >= BO_AndAssign) 2941 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2942 else 2943 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2944 } 2945 2946 static bool isShiftAssignOp(Opcode Opc) { 2947 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2948 } 2949 bool isShiftAssignOp() const { 2950 return isShiftAssignOp(getOpcode()); 2951 } 2952 2953 static bool classof(const Stmt *S) { 2954 return S->getStmtClass() >= firstBinaryOperatorConstant && 2955 S->getStmtClass() <= lastBinaryOperatorConstant; 2956 } 2957 2958 // Iterators 2959 child_range children() { 2960 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2961 } 2962 2963 // Set the FP contractability status of this operator. Only meaningful for 2964 // operations on floating point types. 2965 void setFPContractable(bool FPC) { FPContractable = FPC; } 2966 2967 // Get the FP contractability status of this operator. Only meaningful for 2968 // operations on floating point types. 2969 bool isFPContractable() const { return FPContractable; } 2970 2971protected: 2972 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2973 ExprValueKind VK, ExprObjectKind OK, 2974 SourceLocation opLoc, bool fpContractable, bool dead2) 2975 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2976 lhs->isTypeDependent() || rhs->isTypeDependent(), 2977 lhs->isValueDependent() || rhs->isValueDependent(), 2978 (lhs->isInstantiationDependent() || 2979 rhs->isInstantiationDependent()), 2980 (lhs->containsUnexpandedParameterPack() || 2981 rhs->containsUnexpandedParameterPack())), 2982 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) { 2983 SubExprs[LHS] = lhs; 2984 SubExprs[RHS] = rhs; 2985 } 2986 2987 BinaryOperator(StmtClass SC, EmptyShell Empty) 2988 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2989}; 2990 2991/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2992/// track of the type the operation is performed in. Due to the semantics of 2993/// these operators, the operands are promoted, the arithmetic performed, an 2994/// implicit conversion back to the result type done, then the assignment takes 2995/// place. This captures the intermediate type which the computation is done 2996/// in. 2997class CompoundAssignOperator : public BinaryOperator { 2998 QualType ComputationLHSType; 2999 QualType ComputationResultType; 3000public: 3001 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 3002 ExprValueKind VK, ExprObjectKind OK, 3003 QualType CompLHSType, QualType CompResultType, 3004 SourceLocation OpLoc, bool fpContractable) 3005 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, fpContractable, 3006 true), 3007 ComputationLHSType(CompLHSType), 3008 ComputationResultType(CompResultType) { 3009 assert(isCompoundAssignmentOp() && 3010 "Only should be used for compound assignments"); 3011 } 3012 3013 /// \brief Build an empty compound assignment operator expression. 3014 explicit CompoundAssignOperator(EmptyShell Empty) 3015 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 3016 3017 // The two computation types are the type the LHS is converted 3018 // to for the computation and the type of the result; the two are 3019 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 3020 QualType getComputationLHSType() const { return ComputationLHSType; } 3021 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 3022 3023 QualType getComputationResultType() const { return ComputationResultType; } 3024 void setComputationResultType(QualType T) { ComputationResultType = T; } 3025 3026 static bool classof(const Stmt *S) { 3027 return S->getStmtClass() == CompoundAssignOperatorClass; 3028 } 3029}; 3030 3031/// AbstractConditionalOperator - An abstract base class for 3032/// ConditionalOperator and BinaryConditionalOperator. 3033class AbstractConditionalOperator : public Expr { 3034 SourceLocation QuestionLoc, ColonLoc; 3035 friend class ASTStmtReader; 3036 3037protected: 3038 AbstractConditionalOperator(StmtClass SC, QualType T, 3039 ExprValueKind VK, ExprObjectKind OK, 3040 bool TD, bool VD, bool ID, 3041 bool ContainsUnexpandedParameterPack, 3042 SourceLocation qloc, 3043 SourceLocation cloc) 3044 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 3045 QuestionLoc(qloc), ColonLoc(cloc) {} 3046 3047 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 3048 : Expr(SC, Empty) { } 3049 3050public: 3051 // getCond - Return the expression representing the condition for 3052 // the ?: operator. 3053 Expr *getCond() const; 3054 3055 // getTrueExpr - Return the subexpression representing the value of 3056 // the expression if the condition evaluates to true. 3057 Expr *getTrueExpr() const; 3058 3059 // getFalseExpr - Return the subexpression representing the value of 3060 // the expression if the condition evaluates to false. This is 3061 // the same as getRHS. 3062 Expr *getFalseExpr() const; 3063 3064 SourceLocation getQuestionLoc() const { return QuestionLoc; } 3065 SourceLocation getColonLoc() const { return ColonLoc; } 3066 3067 static bool classof(const Stmt *T) { 3068 return T->getStmtClass() == ConditionalOperatorClass || 3069 T->getStmtClass() == BinaryConditionalOperatorClass; 3070 } 3071}; 3072 3073/// ConditionalOperator - The ?: ternary operator. The GNU "missing 3074/// middle" extension is a BinaryConditionalOperator. 3075class ConditionalOperator : public AbstractConditionalOperator { 3076 enum { COND, LHS, RHS, END_EXPR }; 3077 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3078 3079 friend class ASTStmtReader; 3080public: 3081 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3082 SourceLocation CLoc, Expr *rhs, 3083 QualType t, ExprValueKind VK, ExprObjectKind OK) 3084 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3085 // FIXME: the type of the conditional operator doesn't 3086 // depend on the type of the conditional, but the standard 3087 // seems to imply that it could. File a bug! 3088 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3089 (cond->isValueDependent() || lhs->isValueDependent() || 3090 rhs->isValueDependent()), 3091 (cond->isInstantiationDependent() || 3092 lhs->isInstantiationDependent() || 3093 rhs->isInstantiationDependent()), 3094 (cond->containsUnexpandedParameterPack() || 3095 lhs->containsUnexpandedParameterPack() || 3096 rhs->containsUnexpandedParameterPack()), 3097 QLoc, CLoc) { 3098 SubExprs[COND] = cond; 3099 SubExprs[LHS] = lhs; 3100 SubExprs[RHS] = rhs; 3101 } 3102 3103 /// \brief Build an empty conditional operator. 3104 explicit ConditionalOperator(EmptyShell Empty) 3105 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3106 3107 // getCond - Return the expression representing the condition for 3108 // the ?: operator. 3109 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3110 3111 // getTrueExpr - Return the subexpression representing the value of 3112 // the expression if the condition evaluates to true. 3113 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3114 3115 // getFalseExpr - Return the subexpression representing the value of 3116 // the expression if the condition evaluates to false. This is 3117 // the same as getRHS. 3118 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3119 3120 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3121 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3122 3123 SourceLocation getLocStart() const LLVM_READONLY { 3124 return getCond()->getLocStart(); 3125 } 3126 SourceLocation getLocEnd() const LLVM_READONLY { 3127 return getRHS()->getLocEnd(); 3128 } 3129 3130 static bool classof(const Stmt *T) { 3131 return T->getStmtClass() == ConditionalOperatorClass; 3132 } 3133 3134 // Iterators 3135 child_range children() { 3136 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3137 } 3138}; 3139 3140/// BinaryConditionalOperator - The GNU extension to the conditional 3141/// operator which allows the middle operand to be omitted. 3142/// 3143/// This is a different expression kind on the assumption that almost 3144/// every client ends up needing to know that these are different. 3145class BinaryConditionalOperator : public AbstractConditionalOperator { 3146 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3147 3148 /// - the common condition/left-hand-side expression, which will be 3149 /// evaluated as the opaque value 3150 /// - the condition, expressed in terms of the opaque value 3151 /// - the left-hand-side, expressed in terms of the opaque value 3152 /// - the right-hand-side 3153 Stmt *SubExprs[NUM_SUBEXPRS]; 3154 OpaqueValueExpr *OpaqueValue; 3155 3156 friend class ASTStmtReader; 3157public: 3158 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3159 Expr *cond, Expr *lhs, Expr *rhs, 3160 SourceLocation qloc, SourceLocation cloc, 3161 QualType t, ExprValueKind VK, ExprObjectKind OK) 3162 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3163 (common->isTypeDependent() || rhs->isTypeDependent()), 3164 (common->isValueDependent() || rhs->isValueDependent()), 3165 (common->isInstantiationDependent() || 3166 rhs->isInstantiationDependent()), 3167 (common->containsUnexpandedParameterPack() || 3168 rhs->containsUnexpandedParameterPack()), 3169 qloc, cloc), 3170 OpaqueValue(opaqueValue) { 3171 SubExprs[COMMON] = common; 3172 SubExprs[COND] = cond; 3173 SubExprs[LHS] = lhs; 3174 SubExprs[RHS] = rhs; 3175 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3176 } 3177 3178 /// \brief Build an empty conditional operator. 3179 explicit BinaryConditionalOperator(EmptyShell Empty) 3180 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3181 3182 /// \brief getCommon - Return the common expression, written to the 3183 /// left of the condition. The opaque value will be bound to the 3184 /// result of this expression. 3185 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3186 3187 /// \brief getOpaqueValue - Return the opaque value placeholder. 3188 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3189 3190 /// \brief getCond - Return the condition expression; this is defined 3191 /// in terms of the opaque value. 3192 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3193 3194 /// \brief getTrueExpr - Return the subexpression which will be 3195 /// evaluated if the condition evaluates to true; this is defined 3196 /// in terms of the opaque value. 3197 Expr *getTrueExpr() const { 3198 return cast<Expr>(SubExprs[LHS]); 3199 } 3200 3201 /// \brief getFalseExpr - Return the subexpression which will be 3202 /// evaluated if the condnition evaluates to false; this is 3203 /// defined in terms of the opaque value. 3204 Expr *getFalseExpr() const { 3205 return cast<Expr>(SubExprs[RHS]); 3206 } 3207 3208 SourceLocation getLocStart() const LLVM_READONLY { 3209 return getCommon()->getLocStart(); 3210 } 3211 SourceLocation getLocEnd() const LLVM_READONLY { 3212 return getFalseExpr()->getLocEnd(); 3213 } 3214 3215 static bool classof(const Stmt *T) { 3216 return T->getStmtClass() == BinaryConditionalOperatorClass; 3217 } 3218 3219 // Iterators 3220 child_range children() { 3221 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3222 } 3223}; 3224 3225inline Expr *AbstractConditionalOperator::getCond() const { 3226 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3227 return co->getCond(); 3228 return cast<BinaryConditionalOperator>(this)->getCond(); 3229} 3230 3231inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3232 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3233 return co->getTrueExpr(); 3234 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3235} 3236 3237inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3238 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3239 return co->getFalseExpr(); 3240 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3241} 3242 3243/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3244class AddrLabelExpr : public Expr { 3245 SourceLocation AmpAmpLoc, LabelLoc; 3246 LabelDecl *Label; 3247public: 3248 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3249 QualType t) 3250 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3251 false), 3252 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3253 3254 /// \brief Build an empty address of a label expression. 3255 explicit AddrLabelExpr(EmptyShell Empty) 3256 : Expr(AddrLabelExprClass, Empty) { } 3257 3258 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3259 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3260 SourceLocation getLabelLoc() const { return LabelLoc; } 3261 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3262 3263 SourceLocation getLocStart() const LLVM_READONLY { return AmpAmpLoc; } 3264 SourceLocation getLocEnd() const LLVM_READONLY { return LabelLoc; } 3265 3266 LabelDecl *getLabel() const { return Label; } 3267 void setLabel(LabelDecl *L) { Label = L; } 3268 3269 static bool classof(const Stmt *T) { 3270 return T->getStmtClass() == AddrLabelExprClass; 3271 } 3272 3273 // Iterators 3274 child_range children() { return child_range(); } 3275}; 3276 3277/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3278/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3279/// takes the value of the last subexpression. 3280/// 3281/// A StmtExpr is always an r-value; values "returned" out of a 3282/// StmtExpr will be copied. 3283class StmtExpr : public Expr { 3284 Stmt *SubStmt; 3285 SourceLocation LParenLoc, RParenLoc; 3286public: 3287 // FIXME: Does type-dependence need to be computed differently? 3288 // FIXME: Do we need to compute instantiation instantiation-dependence for 3289 // statements? (ugh!) 3290 StmtExpr(CompoundStmt *substmt, QualType T, 3291 SourceLocation lp, SourceLocation rp) : 3292 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3293 T->isDependentType(), false, false, false), 3294 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3295 3296 /// \brief Build an empty statement expression. 3297 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3298 3299 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3300 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3301 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3302 3303 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; } 3304 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3305 3306 SourceLocation getLParenLoc() const { return LParenLoc; } 3307 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3308 SourceLocation getRParenLoc() const { return RParenLoc; } 3309 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3310 3311 static bool classof(const Stmt *T) { 3312 return T->getStmtClass() == StmtExprClass; 3313 } 3314 3315 // Iterators 3316 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3317}; 3318 3319 3320/// ShuffleVectorExpr - clang-specific builtin-in function 3321/// __builtin_shufflevector. 3322/// This AST node represents a operator that does a constant 3323/// shuffle, similar to LLVM's shufflevector instruction. It takes 3324/// two vectors and a variable number of constant indices, 3325/// and returns the appropriately shuffled vector. 3326class ShuffleVectorExpr : public Expr { 3327 SourceLocation BuiltinLoc, RParenLoc; 3328 3329 // SubExprs - the list of values passed to the __builtin_shufflevector 3330 // function. The first two are vectors, and the rest are constant 3331 // indices. The number of values in this list is always 3332 // 2+the number of indices in the vector type. 3333 Stmt **SubExprs; 3334 unsigned NumExprs; 3335 3336public: 3337 ShuffleVectorExpr(ASTContext &C, ArrayRef<Expr*> args, QualType Type, 3338 SourceLocation BLoc, SourceLocation RP); 3339 3340 /// \brief Build an empty vector-shuffle expression. 3341 explicit ShuffleVectorExpr(EmptyShell Empty) 3342 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3343 3344 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3345 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3346 3347 SourceLocation getRParenLoc() const { return RParenLoc; } 3348 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3349 3350 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3351 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3352 3353 static bool classof(const Stmt *T) { 3354 return T->getStmtClass() == ShuffleVectorExprClass; 3355 } 3356 3357 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3358 /// constant expression, the actual arguments passed in, and the function 3359 /// pointers. 3360 unsigned getNumSubExprs() const { return NumExprs; } 3361 3362 /// \brief Retrieve the array of expressions. 3363 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3364 3365 /// getExpr - Return the Expr at the specified index. 3366 Expr *getExpr(unsigned Index) { 3367 assert((Index < NumExprs) && "Arg access out of range!"); 3368 return cast<Expr>(SubExprs[Index]); 3369 } 3370 const Expr *getExpr(unsigned Index) const { 3371 assert((Index < NumExprs) && "Arg access out of range!"); 3372 return cast<Expr>(SubExprs[Index]); 3373 } 3374 3375 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3376 3377 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) const { 3378 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3379 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3380 } 3381 3382 // Iterators 3383 child_range children() { 3384 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3385 } 3386}; 3387 3388/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3389/// This AST node is similar to the conditional operator (?:) in C, with 3390/// the following exceptions: 3391/// - the test expression must be a integer constant expression. 3392/// - the expression returned acts like the chosen subexpression in every 3393/// visible way: the type is the same as that of the chosen subexpression, 3394/// and all predicates (whether it's an l-value, whether it's an integer 3395/// constant expression, etc.) return the same result as for the chosen 3396/// sub-expression. 3397class ChooseExpr : public Expr { 3398 enum { COND, LHS, RHS, END_EXPR }; 3399 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3400 SourceLocation BuiltinLoc, RParenLoc; 3401public: 3402 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3403 QualType t, ExprValueKind VK, ExprObjectKind OK, 3404 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3405 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3406 (cond->isInstantiationDependent() || 3407 lhs->isInstantiationDependent() || 3408 rhs->isInstantiationDependent()), 3409 (cond->containsUnexpandedParameterPack() || 3410 lhs->containsUnexpandedParameterPack() || 3411 rhs->containsUnexpandedParameterPack())), 3412 BuiltinLoc(BLoc), RParenLoc(RP) { 3413 SubExprs[COND] = cond; 3414 SubExprs[LHS] = lhs; 3415 SubExprs[RHS] = rhs; 3416 } 3417 3418 /// \brief Build an empty __builtin_choose_expr. 3419 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3420 3421 /// isConditionTrue - Return whether the condition is true (i.e. not 3422 /// equal to zero). 3423 bool isConditionTrue(const ASTContext &C) const; 3424 3425 /// getChosenSubExpr - Return the subexpression chosen according to the 3426 /// condition. 3427 Expr *getChosenSubExpr(const ASTContext &C) const { 3428 return isConditionTrue(C) ? getLHS() : getRHS(); 3429 } 3430 3431 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3432 void setCond(Expr *E) { SubExprs[COND] = E; } 3433 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3434 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3435 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3436 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3437 3438 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3439 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3440 3441 SourceLocation getRParenLoc() const { return RParenLoc; } 3442 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3443 3444 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3445 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3446 3447 static bool classof(const Stmt *T) { 3448 return T->getStmtClass() == ChooseExprClass; 3449 } 3450 3451 // Iterators 3452 child_range children() { 3453 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3454 } 3455}; 3456 3457/// GNUNullExpr - Implements the GNU __null extension, which is a name 3458/// for a null pointer constant that has integral type (e.g., int or 3459/// long) and is the same size and alignment as a pointer. The __null 3460/// extension is typically only used by system headers, which define 3461/// NULL as __null in C++ rather than using 0 (which is an integer 3462/// that may not match the size of a pointer). 3463class GNUNullExpr : public Expr { 3464 /// TokenLoc - The location of the __null keyword. 3465 SourceLocation TokenLoc; 3466 3467public: 3468 GNUNullExpr(QualType Ty, SourceLocation Loc) 3469 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3470 false), 3471 TokenLoc(Loc) { } 3472 3473 /// \brief Build an empty GNU __null expression. 3474 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3475 3476 /// getTokenLocation - The location of the __null token. 3477 SourceLocation getTokenLocation() const { return TokenLoc; } 3478 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3479 3480 SourceLocation getLocStart() const LLVM_READONLY { return TokenLoc; } 3481 SourceLocation getLocEnd() const LLVM_READONLY { return TokenLoc; } 3482 3483 static bool classof(const Stmt *T) { 3484 return T->getStmtClass() == GNUNullExprClass; 3485 } 3486 3487 // Iterators 3488 child_range children() { return child_range(); } 3489}; 3490 3491/// VAArgExpr, used for the builtin function __builtin_va_arg. 3492class VAArgExpr : public Expr { 3493 Stmt *Val; 3494 TypeSourceInfo *TInfo; 3495 SourceLocation BuiltinLoc, RParenLoc; 3496public: 3497 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3498 SourceLocation RPLoc, QualType t) 3499 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3500 t->isDependentType(), false, 3501 (TInfo->getType()->isInstantiationDependentType() || 3502 e->isInstantiationDependent()), 3503 (TInfo->getType()->containsUnexpandedParameterPack() || 3504 e->containsUnexpandedParameterPack())), 3505 Val(e), TInfo(TInfo), 3506 BuiltinLoc(BLoc), 3507 RParenLoc(RPLoc) { } 3508 3509 /// \brief Create an empty __builtin_va_arg expression. 3510 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3511 3512 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3513 Expr *getSubExpr() { return cast<Expr>(Val); } 3514 void setSubExpr(Expr *E) { Val = E; } 3515 3516 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3517 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3518 3519 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3520 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3521 3522 SourceLocation getRParenLoc() const { return RParenLoc; } 3523 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3524 3525 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3526 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3527 3528 static bool classof(const Stmt *T) { 3529 return T->getStmtClass() == VAArgExprClass; 3530 } 3531 3532 // Iterators 3533 child_range children() { return child_range(&Val, &Val+1); } 3534}; 3535 3536/// @brief Describes an C or C++ initializer list. 3537/// 3538/// InitListExpr describes an initializer list, which can be used to 3539/// initialize objects of different types, including 3540/// struct/class/union types, arrays, and vectors. For example: 3541/// 3542/// @code 3543/// struct foo x = { 1, { 2, 3 } }; 3544/// @endcode 3545/// 3546/// Prior to semantic analysis, an initializer list will represent the 3547/// initializer list as written by the user, but will have the 3548/// placeholder type "void". This initializer list is called the 3549/// syntactic form of the initializer, and may contain C99 designated 3550/// initializers (represented as DesignatedInitExprs), initializations 3551/// of subobject members without explicit braces, and so on. Clients 3552/// interested in the original syntax of the initializer list should 3553/// use the syntactic form of the initializer list. 3554/// 3555/// After semantic analysis, the initializer list will represent the 3556/// semantic form of the initializer, where the initializations of all 3557/// subobjects are made explicit with nested InitListExpr nodes and 3558/// C99 designators have been eliminated by placing the designated 3559/// initializations into the subobject they initialize. Additionally, 3560/// any "holes" in the initialization, where no initializer has been 3561/// specified for a particular subobject, will be replaced with 3562/// implicitly-generated ImplicitValueInitExpr expressions that 3563/// value-initialize the subobjects. Note, however, that the 3564/// initializer lists may still have fewer initializers than there are 3565/// elements to initialize within the object. 3566/// 3567/// After semantic analysis has completed, given an initializer list, 3568/// method isSemanticForm() returns true if and only if this is the 3569/// semantic form of the initializer list (note: the same AST node 3570/// may at the same time be the syntactic form). 3571/// Given the semantic form of the initializer list, one can retrieve 3572/// the syntactic form of that initializer list (when different) 3573/// using method getSyntacticForm(); the method returns null if applied 3574/// to a initializer list which is already in syntactic form. 3575/// Similarly, given the syntactic form (i.e., an initializer list such 3576/// that isSemanticForm() returns false), one can retrieve the semantic 3577/// form using method getSemanticForm(). 3578/// Since many initializer lists have the same syntactic and semantic forms, 3579/// getSyntacticForm() may return NULL, indicating that the current 3580/// semantic initializer list also serves as its syntactic form. 3581class InitListExpr : public Expr { 3582 // FIXME: Eliminate this vector in favor of ASTContext allocation 3583 typedef ASTVector<Stmt *> InitExprsTy; 3584 InitExprsTy InitExprs; 3585 SourceLocation LBraceLoc, RBraceLoc; 3586 3587 /// The alternative form of the initializer list (if it exists). 3588 /// The int part of the pair stores whether this initalizer list is 3589 /// in semantic form. If not null, the pointer points to: 3590 /// - the syntactic form, if this is in semantic form; 3591 /// - the semantic form, if this is in syntactic form. 3592 llvm::PointerIntPair<InitListExpr *, 1, bool> AltForm; 3593 3594 /// \brief Either: 3595 /// If this initializer list initializes an array with more elements than 3596 /// there are initializers in the list, specifies an expression to be used 3597 /// for value initialization of the rest of the elements. 3598 /// Or 3599 /// If this initializer list initializes a union, specifies which 3600 /// field within the union will be initialized. 3601 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3602 3603public: 3604 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3605 ArrayRef<Expr*> initExprs, SourceLocation rbraceloc); 3606 3607 /// \brief Build an empty initializer list. 3608 explicit InitListExpr(EmptyShell Empty) 3609 : Expr(InitListExprClass, Empty) { } 3610 3611 unsigned getNumInits() const { return InitExprs.size(); } 3612 3613 /// \brief Retrieve the set of initializers. 3614 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3615 3616 const Expr *getInit(unsigned Init) const { 3617 assert(Init < getNumInits() && "Initializer access out of range!"); 3618 return cast_or_null<Expr>(InitExprs[Init]); 3619 } 3620 3621 Expr *getInit(unsigned Init) { 3622 assert(Init < getNumInits() && "Initializer access out of range!"); 3623 return cast_or_null<Expr>(InitExprs[Init]); 3624 } 3625 3626 void setInit(unsigned Init, Expr *expr) { 3627 assert(Init < getNumInits() && "Initializer access out of range!"); 3628 InitExprs[Init] = expr; 3629 } 3630 3631 /// \brief Reserve space for some number of initializers. 3632 void reserveInits(ASTContext &C, unsigned NumInits); 3633 3634 /// @brief Specify the number of initializers 3635 /// 3636 /// If there are more than @p NumInits initializers, the remaining 3637 /// initializers will be destroyed. If there are fewer than @p 3638 /// NumInits initializers, NULL expressions will be added for the 3639 /// unknown initializers. 3640 void resizeInits(ASTContext &Context, unsigned NumInits); 3641 3642 /// @brief Updates the initializer at index @p Init with the new 3643 /// expression @p expr, and returns the old expression at that 3644 /// location. 3645 /// 3646 /// When @p Init is out of range for this initializer list, the 3647 /// initializer list will be extended with NULL expressions to 3648 /// accommodate the new entry. 3649 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3650 3651 /// \brief If this initializer list initializes an array with more elements 3652 /// than there are initializers in the list, specifies an expression to be 3653 /// used for value initialization of the rest of the elements. 3654 Expr *getArrayFiller() { 3655 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3656 } 3657 const Expr *getArrayFiller() const { 3658 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3659 } 3660 void setArrayFiller(Expr *filler); 3661 3662 /// \brief Return true if this is an array initializer and its array "filler" 3663 /// has been set. 3664 bool hasArrayFiller() const { return getArrayFiller(); } 3665 3666 /// \brief If this initializes a union, specifies which field in the 3667 /// union to initialize. 3668 /// 3669 /// Typically, this field is the first named field within the 3670 /// union. However, a designated initializer can specify the 3671 /// initialization of a different field within the union. 3672 FieldDecl *getInitializedFieldInUnion() { 3673 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3674 } 3675 const FieldDecl *getInitializedFieldInUnion() const { 3676 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3677 } 3678 void setInitializedFieldInUnion(FieldDecl *FD) { 3679 ArrayFillerOrUnionFieldInit = FD; 3680 } 3681 3682 // Explicit InitListExpr's originate from source code (and have valid source 3683 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3684 bool isExplicit() { 3685 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3686 } 3687 3688 // Is this an initializer for an array of characters, initialized by a string 3689 // literal or an @encode? 3690 bool isStringLiteralInit() const; 3691 3692 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3693 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3694 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3695 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3696 3697 bool isSemanticForm() const { return AltForm.getInt(); } 3698 InitListExpr *getSemanticForm() const { 3699 return isSemanticForm() ? 0 : AltForm.getPointer(); 3700 } 3701 InitListExpr *getSyntacticForm() const { 3702 return isSemanticForm() ? AltForm.getPointer() : 0; 3703 } 3704 3705 void setSyntacticForm(InitListExpr *Init) { 3706 AltForm.setPointer(Init); 3707 AltForm.setInt(true); 3708 Init->AltForm.setPointer(this); 3709 Init->AltForm.setInt(false); 3710 } 3711 3712 bool hadArrayRangeDesignator() const { 3713 return InitListExprBits.HadArrayRangeDesignator != 0; 3714 } 3715 void sawArrayRangeDesignator(bool ARD = true) { 3716 InitListExprBits.HadArrayRangeDesignator = ARD; 3717 } 3718 3719 bool initializesStdInitializerList() const { 3720 return InitListExprBits.InitializesStdInitializerList != 0; 3721 } 3722 void setInitializesStdInitializerList(bool ISIL = true) { 3723 InitListExprBits.InitializesStdInitializerList = ISIL; 3724 } 3725 3726 SourceLocation getLocStart() const LLVM_READONLY; 3727 SourceLocation getLocEnd() const LLVM_READONLY; 3728 3729 static bool classof(const Stmt *T) { 3730 return T->getStmtClass() == InitListExprClass; 3731 } 3732 3733 // Iterators 3734 child_range children() { 3735 if (InitExprs.empty()) return child_range(); 3736 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3737 } 3738 3739 typedef InitExprsTy::iterator iterator; 3740 typedef InitExprsTy::const_iterator const_iterator; 3741 typedef InitExprsTy::reverse_iterator reverse_iterator; 3742 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3743 3744 iterator begin() { return InitExprs.begin(); } 3745 const_iterator begin() const { return InitExprs.begin(); } 3746 iterator end() { return InitExprs.end(); } 3747 const_iterator end() const { return InitExprs.end(); } 3748 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3749 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3750 reverse_iterator rend() { return InitExprs.rend(); } 3751 const_reverse_iterator rend() const { return InitExprs.rend(); } 3752 3753 friend class ASTStmtReader; 3754 friend class ASTStmtWriter; 3755}; 3756 3757/// @brief Represents a C99 designated initializer expression. 3758/// 3759/// A designated initializer expression (C99 6.7.8) contains one or 3760/// more designators (which can be field designators, array 3761/// designators, or GNU array-range designators) followed by an 3762/// expression that initializes the field or element(s) that the 3763/// designators refer to. For example, given: 3764/// 3765/// @code 3766/// struct point { 3767/// double x; 3768/// double y; 3769/// }; 3770/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3771/// @endcode 3772/// 3773/// The InitListExpr contains three DesignatedInitExprs, the first of 3774/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3775/// designators, one array designator for @c [2] followed by one field 3776/// designator for @c .y. The initalization expression will be 1.0. 3777class DesignatedInitExpr : public Expr { 3778public: 3779 /// \brief Forward declaration of the Designator class. 3780 class Designator; 3781 3782private: 3783 /// The location of the '=' or ':' prior to the actual initializer 3784 /// expression. 3785 SourceLocation EqualOrColonLoc; 3786 3787 /// Whether this designated initializer used the GNU deprecated 3788 /// syntax rather than the C99 '=' syntax. 3789 bool GNUSyntax : 1; 3790 3791 /// The number of designators in this initializer expression. 3792 unsigned NumDesignators : 15; 3793 3794 /// The number of subexpressions of this initializer expression, 3795 /// which contains both the initializer and any additional 3796 /// expressions used by array and array-range designators. 3797 unsigned NumSubExprs : 16; 3798 3799 /// \brief The designators in this designated initialization 3800 /// expression. 3801 Designator *Designators; 3802 3803 3804 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3805 const Designator *Designators, 3806 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3807 ArrayRef<Expr*> IndexExprs, Expr *Init); 3808 3809 explicit DesignatedInitExpr(unsigned NumSubExprs) 3810 : Expr(DesignatedInitExprClass, EmptyShell()), 3811 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3812 3813public: 3814 /// A field designator, e.g., ".x". 3815 struct FieldDesignator { 3816 /// Refers to the field that is being initialized. The low bit 3817 /// of this field determines whether this is actually a pointer 3818 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3819 /// initially constructed, a field designator will store an 3820 /// IdentifierInfo*. After semantic analysis has resolved that 3821 /// name, the field designator will instead store a FieldDecl*. 3822 uintptr_t NameOrField; 3823 3824 /// The location of the '.' in the designated initializer. 3825 unsigned DotLoc; 3826 3827 /// The location of the field name in the designated initializer. 3828 unsigned FieldLoc; 3829 }; 3830 3831 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3832 struct ArrayOrRangeDesignator { 3833 /// Location of the first index expression within the designated 3834 /// initializer expression's list of subexpressions. 3835 unsigned Index; 3836 /// The location of the '[' starting the array range designator. 3837 unsigned LBracketLoc; 3838 /// The location of the ellipsis separating the start and end 3839 /// indices. Only valid for GNU array-range designators. 3840 unsigned EllipsisLoc; 3841 /// The location of the ']' terminating the array range designator. 3842 unsigned RBracketLoc; 3843 }; 3844 3845 /// @brief Represents a single C99 designator. 3846 /// 3847 /// @todo This class is infuriatingly similar to clang::Designator, 3848 /// but minor differences (storing indices vs. storing pointers) 3849 /// keep us from reusing it. Try harder, later, to rectify these 3850 /// differences. 3851 class Designator { 3852 /// @brief The kind of designator this describes. 3853 enum { 3854 FieldDesignator, 3855 ArrayDesignator, 3856 ArrayRangeDesignator 3857 } Kind; 3858 3859 union { 3860 /// A field designator, e.g., ".x". 3861 struct FieldDesignator Field; 3862 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3863 struct ArrayOrRangeDesignator ArrayOrRange; 3864 }; 3865 friend class DesignatedInitExpr; 3866 3867 public: 3868 Designator() {} 3869 3870 /// @brief Initializes a field designator. 3871 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3872 SourceLocation FieldLoc) 3873 : Kind(FieldDesignator) { 3874 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3875 Field.DotLoc = DotLoc.getRawEncoding(); 3876 Field.FieldLoc = FieldLoc.getRawEncoding(); 3877 } 3878 3879 /// @brief Initializes an array designator. 3880 Designator(unsigned Index, SourceLocation LBracketLoc, 3881 SourceLocation RBracketLoc) 3882 : Kind(ArrayDesignator) { 3883 ArrayOrRange.Index = Index; 3884 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3885 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3886 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3887 } 3888 3889 /// @brief Initializes a GNU array-range designator. 3890 Designator(unsigned Index, SourceLocation LBracketLoc, 3891 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3892 : Kind(ArrayRangeDesignator) { 3893 ArrayOrRange.Index = Index; 3894 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3895 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3896 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3897 } 3898 3899 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3900 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3901 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3902 3903 IdentifierInfo *getFieldName() const; 3904 3905 FieldDecl *getField() const { 3906 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3907 if (Field.NameOrField & 0x01) 3908 return 0; 3909 else 3910 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3911 } 3912 3913 void setField(FieldDecl *FD) { 3914 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3915 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3916 } 3917 3918 SourceLocation getDotLoc() const { 3919 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3920 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3921 } 3922 3923 SourceLocation getFieldLoc() const { 3924 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3925 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3926 } 3927 3928 SourceLocation getLBracketLoc() const { 3929 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3930 "Only valid on an array or array-range designator"); 3931 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3932 } 3933 3934 SourceLocation getRBracketLoc() const { 3935 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3936 "Only valid on an array or array-range designator"); 3937 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3938 } 3939 3940 SourceLocation getEllipsisLoc() const { 3941 assert(Kind == ArrayRangeDesignator && 3942 "Only valid on an array-range designator"); 3943 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3944 } 3945 3946 unsigned getFirstExprIndex() const { 3947 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3948 "Only valid on an array or array-range designator"); 3949 return ArrayOrRange.Index; 3950 } 3951 3952 SourceLocation getLocStart() const LLVM_READONLY { 3953 if (Kind == FieldDesignator) 3954 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3955 else 3956 return getLBracketLoc(); 3957 } 3958 SourceLocation getLocEnd() const LLVM_READONLY { 3959 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3960 } 3961 SourceRange getSourceRange() const LLVM_READONLY { 3962 return SourceRange(getLocStart(), getLocEnd()); 3963 } 3964 }; 3965 3966 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3967 unsigned NumDesignators, 3968 ArrayRef<Expr*> IndexExprs, 3969 SourceLocation EqualOrColonLoc, 3970 bool GNUSyntax, Expr *Init); 3971 3972 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3973 3974 /// @brief Returns the number of designators in this initializer. 3975 unsigned size() const { return NumDesignators; } 3976 3977 // Iterator access to the designators. 3978 typedef Designator *designators_iterator; 3979 designators_iterator designators_begin() { return Designators; } 3980 designators_iterator designators_end() { 3981 return Designators + NumDesignators; 3982 } 3983 3984 typedef const Designator *const_designators_iterator; 3985 const_designators_iterator designators_begin() const { return Designators; } 3986 const_designators_iterator designators_end() const { 3987 return Designators + NumDesignators; 3988 } 3989 3990 typedef std::reverse_iterator<designators_iterator> 3991 reverse_designators_iterator; 3992 reverse_designators_iterator designators_rbegin() { 3993 return reverse_designators_iterator(designators_end()); 3994 } 3995 reverse_designators_iterator designators_rend() { 3996 return reverse_designators_iterator(designators_begin()); 3997 } 3998 3999 typedef std::reverse_iterator<const_designators_iterator> 4000 const_reverse_designators_iterator; 4001 const_reverse_designators_iterator designators_rbegin() const { 4002 return const_reverse_designators_iterator(designators_end()); 4003 } 4004 const_reverse_designators_iterator designators_rend() const { 4005 return const_reverse_designators_iterator(designators_begin()); 4006 } 4007 4008 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 4009 4010 void setDesignators(ASTContext &C, const Designator *Desigs, 4011 unsigned NumDesigs); 4012 4013 Expr *getArrayIndex(const Designator& D); 4014 Expr *getArrayRangeStart(const Designator& D); 4015 Expr *getArrayRangeEnd(const Designator& D); 4016 4017 /// @brief Retrieve the location of the '=' that precedes the 4018 /// initializer value itself, if present. 4019 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 4020 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 4021 4022 /// @brief Determines whether this designated initializer used the 4023 /// deprecated GNU syntax for designated initializers. 4024 bool usesGNUSyntax() const { return GNUSyntax; } 4025 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 4026 4027 /// @brief Retrieve the initializer value. 4028 Expr *getInit() const { 4029 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 4030 } 4031 4032 void setInit(Expr *init) { 4033 *child_begin() = init; 4034 } 4035 4036 /// \brief Retrieve the total number of subexpressions in this 4037 /// designated initializer expression, including the actual 4038 /// initialized value and any expressions that occur within array 4039 /// and array-range designators. 4040 unsigned getNumSubExprs() const { return NumSubExprs; } 4041 4042 Expr *getSubExpr(unsigned Idx) { 4043 assert(Idx < NumSubExprs && "Subscript out of range"); 4044 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 4045 Ptr += sizeof(DesignatedInitExpr); 4046 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 4047 } 4048 4049 void setSubExpr(unsigned Idx, Expr *E) { 4050 assert(Idx < NumSubExprs && "Subscript out of range"); 4051 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 4052 Ptr += sizeof(DesignatedInitExpr); 4053 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 4054 } 4055 4056 /// \brief Replaces the designator at index @p Idx with the series 4057 /// of designators in [First, Last). 4058 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 4059 const Designator *Last); 4060 4061 SourceRange getDesignatorsSourceRange() const; 4062 4063 SourceLocation getLocStart() const LLVM_READONLY; 4064 SourceLocation getLocEnd() const LLVM_READONLY; 4065 4066 static bool classof(const Stmt *T) { 4067 return T->getStmtClass() == DesignatedInitExprClass; 4068 } 4069 4070 // Iterators 4071 child_range children() { 4072 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 4073 return child_range(begin, begin + NumSubExprs); 4074 } 4075}; 4076 4077/// \brief Represents an implicitly-generated value initialization of 4078/// an object of a given type. 4079/// 4080/// Implicit value initializations occur within semantic initializer 4081/// list expressions (InitListExpr) as placeholders for subobject 4082/// initializations not explicitly specified by the user. 4083/// 4084/// \see InitListExpr 4085class ImplicitValueInitExpr : public Expr { 4086public: 4087 explicit ImplicitValueInitExpr(QualType ty) 4088 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 4089 false, false, ty->isInstantiationDependentType(), false) { } 4090 4091 /// \brief Construct an empty implicit value initialization. 4092 explicit ImplicitValueInitExpr(EmptyShell Empty) 4093 : Expr(ImplicitValueInitExprClass, Empty) { } 4094 4095 static bool classof(const Stmt *T) { 4096 return T->getStmtClass() == ImplicitValueInitExprClass; 4097 } 4098 4099 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); } 4100 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); } 4101 4102 // Iterators 4103 child_range children() { return child_range(); } 4104}; 4105 4106 4107class ParenListExpr : public Expr { 4108 Stmt **Exprs; 4109 unsigned NumExprs; 4110 SourceLocation LParenLoc, RParenLoc; 4111 4112public: 4113 ParenListExpr(ASTContext& C, SourceLocation lparenloc, ArrayRef<Expr*> exprs, 4114 SourceLocation rparenloc); 4115 4116 /// \brief Build an empty paren list. 4117 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4118 4119 unsigned getNumExprs() const { return NumExprs; } 4120 4121 const Expr* getExpr(unsigned Init) const { 4122 assert(Init < getNumExprs() && "Initializer access out of range!"); 4123 return cast_or_null<Expr>(Exprs[Init]); 4124 } 4125 4126 Expr* getExpr(unsigned Init) { 4127 assert(Init < getNumExprs() && "Initializer access out of range!"); 4128 return cast_or_null<Expr>(Exprs[Init]); 4129 } 4130 4131 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4132 4133 SourceLocation getLParenLoc() const { return LParenLoc; } 4134 SourceLocation getRParenLoc() const { return RParenLoc; } 4135 4136 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; } 4137 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4138 4139 static bool classof(const Stmt *T) { 4140 return T->getStmtClass() == ParenListExprClass; 4141 } 4142 4143 // Iterators 4144 child_range children() { 4145 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4146 } 4147 4148 friend class ASTStmtReader; 4149 friend class ASTStmtWriter; 4150}; 4151 4152 4153/// \brief Represents a C11 generic selection. 4154/// 4155/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4156/// expression, followed by one or more generic associations. Each generic 4157/// association specifies a type name and an expression, or "default" and an 4158/// expression (in which case it is known as a default generic association). 4159/// The type and value of the generic selection are identical to those of its 4160/// result expression, which is defined as the expression in the generic 4161/// association with a type name that is compatible with the type of the 4162/// controlling expression, or the expression in the default generic association 4163/// if no types are compatible. For example: 4164/// 4165/// @code 4166/// _Generic(X, double: 1, float: 2, default: 3) 4167/// @endcode 4168/// 4169/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4170/// or 3 if "hello". 4171/// 4172/// As an extension, generic selections are allowed in C++, where the following 4173/// additional semantics apply: 4174/// 4175/// Any generic selection whose controlling expression is type-dependent or 4176/// which names a dependent type in its association list is result-dependent, 4177/// which means that the choice of result expression is dependent. 4178/// Result-dependent generic associations are both type- and value-dependent. 4179class GenericSelectionExpr : public Expr { 4180 enum { CONTROLLING, END_EXPR }; 4181 TypeSourceInfo **AssocTypes; 4182 Stmt **SubExprs; 4183 unsigned NumAssocs, ResultIndex; 4184 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4185 4186public: 4187 GenericSelectionExpr(ASTContext &Context, 4188 SourceLocation GenericLoc, Expr *ControllingExpr, 4189 ArrayRef<TypeSourceInfo*> AssocTypes, 4190 ArrayRef<Expr*> AssocExprs, 4191 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4192 bool ContainsUnexpandedParameterPack, 4193 unsigned ResultIndex); 4194 4195 /// This constructor is used in the result-dependent case. 4196 GenericSelectionExpr(ASTContext &Context, 4197 SourceLocation GenericLoc, Expr *ControllingExpr, 4198 ArrayRef<TypeSourceInfo*> AssocTypes, 4199 ArrayRef<Expr*> AssocExprs, 4200 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4201 bool ContainsUnexpandedParameterPack); 4202 4203 explicit GenericSelectionExpr(EmptyShell Empty) 4204 : Expr(GenericSelectionExprClass, Empty) { } 4205 4206 unsigned getNumAssocs() const { return NumAssocs; } 4207 4208 SourceLocation getGenericLoc() const { return GenericLoc; } 4209 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4210 SourceLocation getRParenLoc() const { return RParenLoc; } 4211 4212 const Expr *getAssocExpr(unsigned i) const { 4213 return cast<Expr>(SubExprs[END_EXPR+i]); 4214 } 4215 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4216 4217 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4218 return AssocTypes[i]; 4219 } 4220 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4221 4222 QualType getAssocType(unsigned i) const { 4223 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4224 return TS->getType(); 4225 else 4226 return QualType(); 4227 } 4228 4229 const Expr *getControllingExpr() const { 4230 return cast<Expr>(SubExprs[CONTROLLING]); 4231 } 4232 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4233 4234 /// Whether this generic selection is result-dependent. 4235 bool isResultDependent() const { return ResultIndex == -1U; } 4236 4237 /// The zero-based index of the result expression's generic association in 4238 /// the generic selection's association list. Defined only if the 4239 /// generic selection is not result-dependent. 4240 unsigned getResultIndex() const { 4241 assert(!isResultDependent() && "Generic selection is result-dependent"); 4242 return ResultIndex; 4243 } 4244 4245 /// The generic selection's result expression. Defined only if the 4246 /// generic selection is not result-dependent. 4247 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4248 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4249 4250 SourceLocation getLocStart() const LLVM_READONLY { return GenericLoc; } 4251 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4252 4253 static bool classof(const Stmt *T) { 4254 return T->getStmtClass() == GenericSelectionExprClass; 4255 } 4256 4257 child_range children() { 4258 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4259 } 4260 4261 friend class ASTStmtReader; 4262}; 4263 4264//===----------------------------------------------------------------------===// 4265// Clang Extensions 4266//===----------------------------------------------------------------------===// 4267 4268 4269/// ExtVectorElementExpr - This represents access to specific elements of a 4270/// vector, and may occur on the left hand side or right hand side. For example 4271/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4272/// 4273/// Note that the base may have either vector or pointer to vector type, just 4274/// like a struct field reference. 4275/// 4276class ExtVectorElementExpr : public Expr { 4277 Stmt *Base; 4278 IdentifierInfo *Accessor; 4279 SourceLocation AccessorLoc; 4280public: 4281 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4282 IdentifierInfo &accessor, SourceLocation loc) 4283 : Expr(ExtVectorElementExprClass, ty, VK, 4284 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4285 base->isTypeDependent(), base->isValueDependent(), 4286 base->isInstantiationDependent(), 4287 base->containsUnexpandedParameterPack()), 4288 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4289 4290 /// \brief Build an empty vector element expression. 4291 explicit ExtVectorElementExpr(EmptyShell Empty) 4292 : Expr(ExtVectorElementExprClass, Empty) { } 4293 4294 const Expr *getBase() const { return cast<Expr>(Base); } 4295 Expr *getBase() { return cast<Expr>(Base); } 4296 void setBase(Expr *E) { Base = E; } 4297 4298 IdentifierInfo &getAccessor() const { return *Accessor; } 4299 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4300 4301 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4302 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4303 4304 /// getNumElements - Get the number of components being selected. 4305 unsigned getNumElements() const; 4306 4307 /// containsDuplicateElements - Return true if any element access is 4308 /// repeated. 4309 bool containsDuplicateElements() const; 4310 4311 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4312 /// aggregate Constant of ConstantInt(s). 4313 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4314 4315 SourceLocation getLocStart() const LLVM_READONLY { 4316 return getBase()->getLocStart(); 4317 } 4318 SourceLocation getLocEnd() const LLVM_READONLY { return AccessorLoc; } 4319 4320 /// isArrow - Return true if the base expression is a pointer to vector, 4321 /// return false if the base expression is a vector. 4322 bool isArrow() const; 4323 4324 static bool classof(const Stmt *T) { 4325 return T->getStmtClass() == ExtVectorElementExprClass; 4326 } 4327 4328 // Iterators 4329 child_range children() { return child_range(&Base, &Base+1); } 4330}; 4331 4332 4333/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4334/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4335class BlockExpr : public Expr { 4336protected: 4337 BlockDecl *TheBlock; 4338public: 4339 BlockExpr(BlockDecl *BD, QualType ty) 4340 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4341 ty->isDependentType(), ty->isDependentType(), 4342 ty->isInstantiationDependentType() || BD->isDependentContext(), 4343 false), 4344 TheBlock(BD) {} 4345 4346 /// \brief Build an empty block expression. 4347 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4348 4349 const BlockDecl *getBlockDecl() const { return TheBlock; } 4350 BlockDecl *getBlockDecl() { return TheBlock; } 4351 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4352 4353 // Convenience functions for probing the underlying BlockDecl. 4354 SourceLocation getCaretLocation() const; 4355 const Stmt *getBody() const; 4356 Stmt *getBody(); 4357 4358 SourceLocation getLocStart() const LLVM_READONLY { return getCaretLocation(); } 4359 SourceLocation getLocEnd() const LLVM_READONLY { return getBody()->getLocEnd(); } 4360 4361 /// getFunctionType - Return the underlying function type for this block. 4362 const FunctionProtoType *getFunctionType() const; 4363 4364 static bool classof(const Stmt *T) { 4365 return T->getStmtClass() == BlockExprClass; 4366 } 4367 4368 // Iterators 4369 child_range children() { return child_range(); } 4370}; 4371 4372/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4373/// This AST node provides support for reinterpreting a type to another 4374/// type of the same size. 4375class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4376private: 4377 Stmt *SrcExpr; 4378 SourceLocation BuiltinLoc, RParenLoc; 4379 4380 friend class ASTReader; 4381 friend class ASTStmtReader; 4382 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4383 4384public: 4385 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4386 ExprValueKind VK, ExprObjectKind OK, 4387 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4388 : Expr(AsTypeExprClass, DstType, VK, OK, 4389 DstType->isDependentType(), 4390 DstType->isDependentType() || SrcExpr->isValueDependent(), 4391 (DstType->isInstantiationDependentType() || 4392 SrcExpr->isInstantiationDependent()), 4393 (DstType->containsUnexpandedParameterPack() || 4394 SrcExpr->containsUnexpandedParameterPack())), 4395 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4396 4397 /// getSrcExpr - Return the Expr to be converted. 4398 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4399 4400 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4401 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4402 4403 /// getRParenLoc - Return the location of final right parenthesis. 4404 SourceLocation getRParenLoc() const { return RParenLoc; } 4405 4406 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 4407 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4408 4409 static bool classof(const Stmt *T) { 4410 return T->getStmtClass() == AsTypeExprClass; 4411 } 4412 4413 // Iterators 4414 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4415}; 4416 4417/// PseudoObjectExpr - An expression which accesses a pseudo-object 4418/// l-value. A pseudo-object is an abstract object, accesses to which 4419/// are translated to calls. The pseudo-object expression has a 4420/// syntactic form, which shows how the expression was actually 4421/// written in the source code, and a semantic form, which is a series 4422/// of expressions to be executed in order which detail how the 4423/// operation is actually evaluated. Optionally, one of the semantic 4424/// forms may also provide a result value for the expression. 4425/// 4426/// If any of the semantic-form expressions is an OpaqueValueExpr, 4427/// that OVE is required to have a source expression, and it is bound 4428/// to the result of that source expression. Such OVEs may appear 4429/// only in subsequent semantic-form expressions and as 4430/// sub-expressions of the syntactic form. 4431/// 4432/// PseudoObjectExpr should be used only when an operation can be 4433/// usefully described in terms of fairly simple rewrite rules on 4434/// objects and functions that are meant to be used by end-developers. 4435/// For example, under the Itanium ABI, dynamic casts are implemented 4436/// as a call to a runtime function called __dynamic_cast; using this 4437/// class to describe that would be inappropriate because that call is 4438/// not really part of the user-visible semantics, and instead the 4439/// cast is properly reflected in the AST and IR-generation has been 4440/// taught to generate the call as necessary. In contrast, an 4441/// Objective-C property access is semantically defined to be 4442/// equivalent to a particular message send, and this is very much 4443/// part of the user model. The name of this class encourages this 4444/// modelling design. 4445class PseudoObjectExpr : public Expr { 4446 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4447 // Always at least two, because the first sub-expression is the 4448 // syntactic form. 4449 4450 // PseudoObjectExprBits.ResultIndex - The index of the 4451 // sub-expression holding the result. 0 means the result is void, 4452 // which is unambiguous because it's the index of the syntactic 4453 // form. Note that this is therefore 1 higher than the value passed 4454 // in to Create, which is an index within the semantic forms. 4455 // Note also that ASTStmtWriter assumes this encoding. 4456 4457 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4458 const Expr * const *getSubExprsBuffer() const { 4459 return reinterpret_cast<const Expr * const *>(this + 1); 4460 } 4461 4462 friend class ASTStmtReader; 4463 4464 PseudoObjectExpr(QualType type, ExprValueKind VK, 4465 Expr *syntactic, ArrayRef<Expr*> semantic, 4466 unsigned resultIndex); 4467 4468 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4469 4470 unsigned getNumSubExprs() const { 4471 return PseudoObjectExprBits.NumSubExprs; 4472 } 4473 4474public: 4475 /// NoResult - A value for the result index indicating that there is 4476 /// no semantic result. 4477 enum { NoResult = ~0U }; 4478 4479 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4480 ArrayRef<Expr*> semantic, 4481 unsigned resultIndex); 4482 4483 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4484 unsigned numSemanticExprs); 4485 4486 /// Return the syntactic form of this expression, i.e. the 4487 /// expression it actually looks like. Likely to be expressed in 4488 /// terms of OpaqueValueExprs bound in the semantic form. 4489 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4490 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4491 4492 /// Return the index of the result-bearing expression into the semantics 4493 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4494 unsigned getResultExprIndex() const { 4495 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4496 return PseudoObjectExprBits.ResultIndex - 1; 4497 } 4498 4499 /// Return the result-bearing expression, or null if there is none. 4500 Expr *getResultExpr() { 4501 if (PseudoObjectExprBits.ResultIndex == 0) 4502 return 0; 4503 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4504 } 4505 const Expr *getResultExpr() const { 4506 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4507 } 4508 4509 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4510 4511 typedef Expr * const *semantics_iterator; 4512 typedef const Expr * const *const_semantics_iterator; 4513 semantics_iterator semantics_begin() { 4514 return getSubExprsBuffer() + 1; 4515 } 4516 const_semantics_iterator semantics_begin() const { 4517 return getSubExprsBuffer() + 1; 4518 } 4519 semantics_iterator semantics_end() { 4520 return getSubExprsBuffer() + getNumSubExprs(); 4521 } 4522 const_semantics_iterator semantics_end() const { 4523 return getSubExprsBuffer() + getNumSubExprs(); 4524 } 4525 Expr *getSemanticExpr(unsigned index) { 4526 assert(index + 1 < getNumSubExprs()); 4527 return getSubExprsBuffer()[index + 1]; 4528 } 4529 const Expr *getSemanticExpr(unsigned index) const { 4530 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4531 } 4532 4533 SourceLocation getExprLoc() const LLVM_READONLY { 4534 return getSyntacticForm()->getExprLoc(); 4535 } 4536 4537 SourceLocation getLocStart() const LLVM_READONLY { 4538 return getSyntacticForm()->getLocStart(); 4539 } 4540 SourceLocation getLocEnd() const LLVM_READONLY { 4541 return getSyntacticForm()->getLocEnd(); 4542 } 4543 4544 child_range children() { 4545 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4546 return child_range(cs, cs + getNumSubExprs()); 4547 } 4548 4549 static bool classof(const Stmt *T) { 4550 return T->getStmtClass() == PseudoObjectExprClass; 4551 } 4552}; 4553 4554/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4555/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4556/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4557/// All of these instructions take one primary pointer and at least one memory 4558/// order. 4559class AtomicExpr : public Expr { 4560public: 4561 enum AtomicOp { 4562#define BUILTIN(ID, TYPE, ATTRS) 4563#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4564#include "clang/Basic/Builtins.def" 4565 // Avoid trailing comma 4566 BI_First = 0 4567 }; 4568 4569private: 4570 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4571 Stmt* SubExprs[END_EXPR]; 4572 unsigned NumSubExprs; 4573 SourceLocation BuiltinLoc, RParenLoc; 4574 AtomicOp Op; 4575 4576 friend class ASTStmtReader; 4577 4578public: 4579 AtomicExpr(SourceLocation BLoc, ArrayRef<Expr*> args, QualType t, 4580 AtomicOp op, SourceLocation RP); 4581 4582 /// \brief Determine the number of arguments the specified atomic builtin 4583 /// should have. 4584 static unsigned getNumSubExprs(AtomicOp Op); 4585 4586 /// \brief Build an empty AtomicExpr. 4587 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4588 4589 Expr *getPtr() const { 4590 return cast<Expr>(SubExprs[PTR]); 4591 } 4592 Expr *getOrder() const { 4593 return cast<Expr>(SubExprs[ORDER]); 4594 } 4595 Expr *getVal1() const { 4596 if (Op == AO__c11_atomic_init) 4597 return cast<Expr>(SubExprs[ORDER]); 4598 assert(NumSubExprs > VAL1); 4599 return cast<Expr>(SubExprs[VAL1]); 4600 } 4601 Expr *getOrderFail() const { 4602 assert(NumSubExprs > ORDER_FAIL); 4603 return cast<Expr>(SubExprs[ORDER_FAIL]); 4604 } 4605 Expr *getVal2() const { 4606 if (Op == AO__atomic_exchange) 4607 return cast<Expr>(SubExprs[ORDER_FAIL]); 4608 assert(NumSubExprs > VAL2); 4609 return cast<Expr>(SubExprs[VAL2]); 4610 } 4611 Expr *getWeak() const { 4612 assert(NumSubExprs > WEAK); 4613 return cast<Expr>(SubExprs[WEAK]); 4614 } 4615 4616 AtomicOp getOp() const { return Op; } 4617 unsigned getNumSubExprs() { return NumSubExprs; } 4618 4619 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4620 4621 bool isVolatile() const { 4622 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4623 } 4624 4625 bool isCmpXChg() const { 4626 return getOp() == AO__c11_atomic_compare_exchange_strong || 4627 getOp() == AO__c11_atomic_compare_exchange_weak || 4628 getOp() == AO__atomic_compare_exchange || 4629 getOp() == AO__atomic_compare_exchange_n; 4630 } 4631 4632 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4633 SourceLocation getRParenLoc() const { return RParenLoc; } 4634 4635 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 4636 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4637 4638 static bool classof(const Stmt *T) { 4639 return T->getStmtClass() == AtomicExprClass; 4640 } 4641 4642 // Iterators 4643 child_range children() { 4644 return child_range(SubExprs, SubExprs+NumSubExprs); 4645 } 4646}; 4647} // end namespace clang 4648 4649#endif 4650