ASTContext.h revision 73322924127c873c13101b705dd823f5539ffa5f
1//===--- ASTContext.h - Context to hold long-lived AST nodes ----*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by Chris Lattner and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_ASTCONTEXT_H 15#define LLVM_CLANG_AST_ASTCONTEXT_H 16 17#include "clang/AST/Builtins.h" 18#include "clang/AST/Expr.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/Type.h" 21#include "llvm/ADT/DenseMap.h" 22#include <vector> 23 24namespace clang { 25 class TargetInfo; 26 27/// ASTContext - This class holds long-lived AST nodes (such as types and 28/// decls) that can be referred to throughout the semantic analysis of a file. 29class ASTContext { 30 std::vector<Type*> Types; 31 llvm::FoldingSet<ComplexType> ComplexTypes; 32 llvm::FoldingSet<PointerType> PointerTypes; 33 llvm::FoldingSet<ReferenceType> ReferenceTypes; 34 llvm::FoldingSet<ArrayType> ArrayTypes; 35 llvm::FoldingSet<VectorType> VectorTypes; 36 llvm::FoldingSet<FunctionTypeNoProto> FunctionTypeNoProtos; 37 llvm::FoldingSet<FunctionTypeProto> FunctionTypeProtos; 38 llvm::DenseMap<const RecordDecl*, const RecordLayout*> RecordLayoutInfo; 39public: 40 TargetInfo &Target; 41 Builtin::Context BuiltinInfo; 42 43 // Builtin Types. 44 QualType VoidTy; 45 QualType BoolTy; 46 QualType CharTy; 47 QualType SignedCharTy, ShortTy, IntTy, LongTy, LongLongTy; 48 QualType UnsignedCharTy, UnsignedShortTy, UnsignedIntTy, UnsignedLongTy; 49 QualType UnsignedLongLongTy; 50 QualType FloatTy, DoubleTy, LongDoubleTy; 51 QualType FloatComplexTy, DoubleComplexTy, LongDoubleComplexTy; 52 53 ASTContext(TargetInfo &t, IdentifierTable &idents) : Target(t) { 54 InitBuiltinTypes(); 55 BuiltinInfo.InitializeBuiltins(idents, Target); 56 } 57 ~ASTContext(); 58 59 void PrintStats() const; 60 61 //===--------------------------------------------------------------------===// 62 // Type Constructors 63 //===--------------------------------------------------------------------===// 64 65 /// getComplexType - Return the uniqued reference to the type for a complex 66 /// number with the specified element type. 67 QualType getComplexType(QualType T); 68 69 /// getPointerType - Return the uniqued reference to the type for a pointer to 70 /// the specified type. 71 QualType getPointerType(QualType T); 72 73 /// getReferenceType - Return the uniqued reference to the type for a 74 /// reference to the specified type. 75 QualType getReferenceType(QualType T); 76 77 /// getArrayType - Return the unique reference to the type for an array of the 78 /// specified element type. 79 QualType getArrayType(QualType EltTy, ArrayType::ArraySizeModifier ASM, 80 unsigned EltTypeQuals, Expr *NumElts); 81 82 /// getVectorType - Return the unique reference to a vector type of 83 /// the specified element type and size. VectorType must be a built-in type. 84 QualType getVectorType(QualType VectorType, unsigned NumElts); 85 86 /// getOCUVectorType - Return the unique reference to an OCU vector type of 87 /// the specified element type and size. VectorType must be a built-in type. 88 QualType getOCUVectorType(QualType VectorType, unsigned NumElts); 89 90 /// getFunctionTypeNoProto - Return a K&R style C function type like 'int()'. 91 /// 92 QualType getFunctionTypeNoProto(QualType ResultTy); 93 94 /// getFunctionType - Return a normal function type with a typed argument 95 /// list. isVariadic indicates whether the argument list includes '...'. 96 QualType getFunctionType(QualType ResultTy, QualType *ArgArray, 97 unsigned NumArgs, bool isVariadic); 98 99 /// getTypedefType - Return the unique reference to the type for the 100 /// specified typename decl. 101 QualType getTypedefType(TypedefDecl *Decl); 102 103 /// getTagDeclType - Return the unique reference to the type for the 104 /// specified TagDecl (struct/union/class/enum) decl. 105 QualType getTagDeclType(TagDecl *Decl); 106 107 /// getSizeType - Return the unique type for "size_t" (C99 7.17), defined 108 /// in <stddef.h>. The sizeof operator requires this (C99 6.5.3.4p4). 109 QualType getSizeType() const; 110 111 /// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 112 /// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 113 QualType getPointerDiffType() const; 114 115 //===--------------------------------------------------------------------===// 116 // Type Sizing and Analysis 117 //===--------------------------------------------------------------------===// 118 119 /// getTypeInfo - Get the size and alignment of the specified complete type in 120 /// bits. 121 std::pair<uint64_t, unsigned> getTypeInfo(QualType T, SourceLocation L); 122 123 /// getTypeSize - Return the size of the specified type, in bits. This method 124 /// does not work on incomplete types. 125 uint64_t getTypeSize(QualType T, SourceLocation L) { 126 return getTypeInfo(T, L).first; 127 } 128 129 /// getTypeAlign - Return the alignment of the specified type, in bits. This 130 /// method does not work on incomplete types. 131 unsigned getTypeAlign(QualType T, SourceLocation L) { 132 return getTypeInfo(T, L).second; 133 } 134 135 /// getRecordLayout - Get or compute information about the layout of the 136 /// specified record (struct/union/class), which indicates its size and field 137 /// position information. 138 const RecordLayout &getRecordLayout(const RecordDecl *D, SourceLocation L); 139 140 //===--------------------------------------------------------------------===// 141 // Type Operators 142 //===--------------------------------------------------------------------===// 143 144 /// getIntegerBitwidth - Return the bitwidth of the specified integer type 145 /// according to the target. 'Loc' specifies the source location that 146 /// requires evaluation of this property. 147 unsigned getIntegerBitwidth(QualType T, SourceLocation Loc); 148 149 /// maxIntegerType - Returns the highest ranked integer type. Handles 3 150 /// different type combos: unsigned/unsigned, signed/signed, signed/unsigned. 151 static QualType maxIntegerType(QualType lhs, QualType rhs); 152 153 /// maxFloatingType - Returns the highest ranked float type. Both input 154 /// types are required to be floats. 155 static QualType maxFloatingType(QualType lt, QualType rt); 156 157 /// maxComplexType - Returns the highest ranked complex type. Handles 3 158 /// different type combos: complex/complex, complex/float, float/complex. 159 QualType maxComplexType(QualType lt, QualType rt) const; 160 161private: 162 ASTContext(const ASTContext&); // DO NOT IMPLEMENT 163 void operator=(const ASTContext&); // DO NOT IMPLEMENT 164 165 void InitBuiltinTypes(); 166 void InitBuiltinType(QualType &R, BuiltinType::Kind K); 167}; 168 169} // end namespace clang 170 171#endif 172