ASTContext.h revision 3f128ad2691d299b96663da85a9e069c4081ea7c 
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 "llvm/ADT/StringMap.h"
23#include <vector>
24
25namespace clang {
26  class TargetInfo;
27  class SelectorTable;
28
29/// ASTContext - This class holds long-lived AST nodes (such as types and
30/// decls) that can be referred to throughout the semantic analysis of a file.
31class ASTContext {
32  std::vector<Type*> Types;
33  llvm::FoldingSet<ComplexType> ComplexTypes;
34  llvm::FoldingSet<PointerType> PointerTypes;
35  llvm::FoldingSet<ReferenceType> ReferenceTypes;
36  llvm::FoldingSet<ConstantArrayType> ArrayTypes;
37  llvm::FoldingSet<VectorType> VectorTypes;
38  llvm::FoldingSet<FunctionTypeNoProto> FunctionTypeNoProtos;
39  llvm::FoldingSet<FunctionTypeProto> FunctionTypeProtos;
40  llvm::DenseMap<const RecordDecl*, const RecordLayout*> RecordLayoutInfo;
41  RecordDecl *CFConstantStringTypeDecl;
42  SelectorTable *Selectors;
43public:
44  SourceManager &SourceMgr;
45  TargetInfo &Target;
46  IdentifierTable &Idents;
47  Builtin::Context BuiltinInfo;
48
49  // Builtin Types.
50  QualType VoidTy;
51  QualType BoolTy;
52  QualType CharTy;
53  QualType SignedCharTy, ShortTy, IntTy, LongTy, LongLongTy;
54  QualType UnsignedCharTy, UnsignedShortTy, UnsignedIntTy, UnsignedLongTy;
55  QualType UnsignedLongLongTy;
56  QualType FloatTy, DoubleTy, LongDoubleTy;
57  QualType FloatComplexTy, DoubleComplexTy, LongDoubleComplexTy;
58
59  ASTContext(SourceManager &SM, TargetInfo &t, IdentifierTable &idents) :
60    CFConstantStringTypeDecl(0), Selectors(0),
61    SourceMgr(SM), Target(t), Idents(idents) {
62    InitBuiltinTypes();
63    BuiltinInfo.InitializeBuiltins(idents, Target);
64  }
65  ~ASTContext();
66
67  void PrintStats() const;
68
69  //===--------------------------------------------------------------------===//
70  //                           Type Constructors
71  //===--------------------------------------------------------------------===//
72
73  /// getComplexType - Return the uniqued reference to the type for a complex
74  /// number with the specified element type.
75  QualType getComplexType(QualType T);
76
77  /// getPointerType - Return the uniqued reference to the type for a pointer to
78  /// the specified type.
79  QualType getPointerType(QualType T);
80
81  /// getReferenceType - Return the uniqued reference to the type for a
82  /// reference to the specified type.
83  QualType getReferenceType(QualType T);
84
85  /// getVariableArrayType - Returns a non-unique reference to the type for a
86  /// variable array of the specified element type.
87  QualType getVariableArrayType(QualType EltTy, Expr *NumElts,
88                                ArrayType::ArraySizeModifier ASM,
89                                unsigned EltTypeQuals);
90
91  /// getConstantArrayType - Return the unique reference to the type for a
92  /// constant array of the specified element type.
93  QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize,
94                                ArrayType::ArraySizeModifier ASM,
95                                unsigned EltTypeQuals);
96
97  /// getVectorType - Return the unique reference to a vector type of
98  /// the specified element type and size. VectorType must be a built-in type.
99  QualType getVectorType(QualType VectorType, unsigned NumElts);
100
101  /// getOCUVectorType - Return the unique reference to an OCU vector type of
102  /// the specified element type and size. VectorType must be a built-in type.
103  QualType getOCUVectorType(QualType VectorType, unsigned NumElts);
104
105  /// getFunctionTypeNoProto - Return a K&R style C function type like 'int()'.
106  ///
107  QualType getFunctionTypeNoProto(QualType ResultTy);
108
109  /// getFunctionType - Return a normal function type with a typed argument
110  /// list.  isVariadic indicates whether the argument list includes '...'.
111  QualType getFunctionType(QualType ResultTy, QualType *ArgArray,
112                           unsigned NumArgs, bool isVariadic);
113
114  /// getTypedefType - Return the unique reference to the type for the
115  /// specified typename decl.
116  QualType getTypedefType(TypedefDecl *Decl);
117  QualType getObjcInterfaceType(ObjcInterfaceDecl *Decl);
118
119  /// getTypeOfType - GCC extension.
120  QualType getTypeOfExpr(Expr *e);
121  QualType getTypeOfType(QualType t);
122
123  /// getTagDeclType - Return the unique reference to the type for the
124  /// specified TagDecl (struct/union/class/enum) decl.
125  QualType getTagDeclType(TagDecl *Decl);
126
127  /// getSizeType - Return the unique type for "size_t" (C99 7.17), defined
128  /// in <stddef.h>. The sizeof operator requires this (C99 6.5.3.4p4).
129  QualType getSizeType() const;
130
131  /// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?)
132  /// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9).
133  QualType getPointerDiffType() const;
134
135  // getCFConstantStringType - Return the type used for constant CFStrings.
136  QualType getCFConstantStringType();
137
138  //===--------------------------------------------------------------------===//
139  //                         Type Sizing and Analysis
140  //===--------------------------------------------------------------------===//
141
142  /// getTypeInfo - Get the size and alignment of the specified complete type in
143  /// bits.
144  std::pair<uint64_t, unsigned> getTypeInfo(QualType T, SourceLocation L);
145
146  /// getTypeSize - Return the size of the specified type, in bits.  This method
147  /// does not work on incomplete types.
148  uint64_t getTypeSize(QualType T, SourceLocation L) {
149    return getTypeInfo(T, L).first;
150  }
151
152  /// getTypeAlign - Return the alignment of the specified type, in bits.  This
153  /// method does not work on incomplete types.
154  unsigned getTypeAlign(QualType T, SourceLocation L) {
155    return getTypeInfo(T, L).second;
156  }
157
158  /// getRecordLayout - Get or compute information about the layout of the
159  /// specified record (struct/union/class), which indicates its size and field
160  /// position information.
161  const RecordLayout &getRecordLayout(const RecordDecl *D, SourceLocation L);
162
163  //===--------------------------------------------------------------------===//
164  //                            Type Operators
165  //===--------------------------------------------------------------------===//
166
167  /// maxIntegerType - Returns the highest ranked integer type. Handles 3
168  /// different type combos: unsigned/unsigned, signed/signed, signed/unsigned.
169  static QualType maxIntegerType(QualType lhs, QualType rhs);
170
171  /// compareFloatingType - Handles 3 different combos:
172  /// float/float, float/complex, complex/complex.
173  /// If lt > rt, return 1. If lt == rt, return 0. If lt < rt, return -1.
174  static int compareFloatingType(QualType lt, QualType rt);
175
176  /// getFloatingTypeOfSizeWithinDomain - Returns a real floating
177  /// point or a complex type (based on typeDomain/typeSize).
178  /// 'typeDomain' is a real floating point or complex type.
179  /// 'typeSize' is a real floating point or complex type.
180  QualType getFloatingTypeOfSizeWithinDomain(QualType typeSize,
181                                             QualType typeDomain) const;
182
183  //===--------------------------------------------------------------------===//
184  //                            Objective-C
185  //===--------------------------------------------------------------------===//
186
187  /// getSelectorInfo - Return a uniqued character string for the selector.
188  SelectorInfo &getSelectorInfo(const char *NameStart, const char *NameEnd);
189
190private:
191  ASTContext(const ASTContext&); // DO NOT IMPLEMENT
192  void operator=(const ASTContext&); // DO NOT IMPLEMENT
193
194  void InitBuiltinTypes();
195  void InitBuiltinType(QualType &R, BuiltinType::Kind K);
196};
197
198}  // end namespace clang
199
200#endif
201