Attr.h revision 801e60946bc879afeb37bcd3372e441e8f631c79
1//===--- Attr.h - Classes for representing attributes ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Attr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_ATTR_H 15#define LLVM_CLANG_AST_ATTR_H 16 17#include "clang/Basic/LLVM.h" 18#include "clang/Basic/AttrKinds.h" 19#include "clang/AST/Type.h" 20#include "clang/Basic/SourceLocation.h" 21#include "clang/Basic/VersionTuple.h" 22#include "llvm/ADT/SmallVector.h" 23#include "llvm/ADT/StringRef.h" 24#include "llvm/ADT/StringSwitch.h" 25#include "llvm/Support/ErrorHandling.h" 26#include "llvm/Support/raw_ostream.h" 27#include <cassert> 28#include <cstring> 29#include <algorithm> 30 31namespace clang { 32 class ASTContext; 33 class IdentifierInfo; 34 class ObjCInterfaceDecl; 35 class Expr; 36 class QualType; 37 class FunctionDecl; 38 class TypeSourceInfo; 39} 40 41// Defined in ASTContext.h 42void *operator new(size_t Bytes, const clang::ASTContext &C, 43 size_t Alignment = 16); 44// FIXME: Being forced to not have a default argument here due to redeclaration 45// rules on default arguments sucks 46void *operator new[](size_t Bytes, const clang::ASTContext &C, 47 size_t Alignment); 48 49// It is good practice to pair new/delete operators. Also, MSVC gives many 50// warnings if a matching delete overload is not declared, even though the 51// throw() spec guarantees it will not be implicitly called. 52void operator delete(void *Ptr, const clang::ASTContext &C, size_t); 53void operator delete[](void *Ptr, const clang::ASTContext &C, size_t); 54 55namespace clang { 56 57/// Attr - This represents one attribute. 58class Attr { 59private: 60 SourceRange Range; 61 unsigned AttrKind : 16; 62 63protected: 64 bool Inherited : 1; 65 66 virtual ~Attr(); 67 68 void* operator new(size_t bytes) throw() { 69 llvm_unreachable("Attrs cannot be allocated with regular 'new'."); 70 } 71 void operator delete(void* data) throw() { 72 llvm_unreachable("Attrs cannot be released with regular 'delete'."); 73 } 74 75public: 76 // Forward so that the regular new and delete do not hide global ones. 77 void* operator new(size_t Bytes, ASTContext &C, 78 size_t Alignment = 16) throw() { 79 return ::operator new(Bytes, C, Alignment); 80 } 81 void operator delete(void *Ptr, ASTContext &C, 82 size_t Alignment) throw() { 83 return ::operator delete(Ptr, C, Alignment); 84 } 85 86protected: 87 Attr(attr::Kind AK, SourceRange R) 88 : Range(R), AttrKind(AK), Inherited(false) {} 89 90public: 91 92 attr::Kind getKind() const { 93 return static_cast<attr::Kind>(AttrKind); 94 } 95 96 SourceLocation getLocation() const { return Range.getBegin(); } 97 SourceRange getRange() const { return Range; } 98 void setRange(SourceRange R) { Range = R; } 99 100 bool isInherited() const { return Inherited; } 101 102 // Clone this attribute. 103 virtual Attr* clone(ASTContext &C) const = 0; 104 105 virtual bool isLateParsed() const { return false; } 106 107 // Pretty print this attribute. 108 virtual void printPretty(llvm::raw_ostream &OS, ASTContext &C) const = 0; 109 110 // Implement isa/cast/dyncast/etc. 111 static bool classof(const Attr *) { return true; } 112}; 113 114class InheritableAttr : public Attr { 115 virtual void anchor(); 116protected: 117 InheritableAttr(attr::Kind AK, SourceRange R) 118 : Attr(AK, R) {} 119 120public: 121 void setInherited(bool I) { Inherited = I; } 122 123 // Implement isa/cast/dyncast/etc. 124 static bool classof(const Attr *A) { 125 return A->getKind() <= attr::LAST_INHERITABLE; 126 } 127 static bool classof(const InheritableAttr *) { return true; } 128}; 129 130class InheritableParamAttr : public InheritableAttr { 131 virtual void anchor(); 132protected: 133 InheritableParamAttr(attr::Kind AK, SourceRange R) 134 : InheritableAttr(AK, R) {} 135 136public: 137 // Implement isa/cast/dyncast/etc. 138 static bool classof(const Attr *A) { 139 return A->getKind() <= attr::LAST_INHERITABLE_PARAM; 140 } 141 static bool classof(const InheritableParamAttr *) { return true; } 142}; 143 144#include "clang/AST/Attrs.inc" 145 146/// AttrVec - A vector of Attr, which is how they are stored on the AST. 147typedef SmallVector<Attr*, 2> AttrVec; 148typedef SmallVector<const Attr*, 2> ConstAttrVec; 149 150/// specific_attr_iterator - Iterates over a subrange of an AttrVec, only 151/// providing attributes that are of a specifc type. 152template <typename SpecificAttr> 153class specific_attr_iterator { 154 /// Current - The current, underlying iterator. 155 /// In order to ensure we don't dereference an invalid iterator unless 156 /// specifically requested, we don't necessarily advance this all the 157 /// way. Instead, we advance it when an operation is requested; if the 158 /// operation is acting on what should be a past-the-end iterator, 159 /// then we offer no guarantees, but this way we do not dererence a 160 /// past-the-end iterator when we move to a past-the-end position. 161 mutable AttrVec::const_iterator Current; 162 163 void AdvanceToNext() const { 164 while (!isa<SpecificAttr>(*Current)) 165 ++Current; 166 } 167 168 void AdvanceToNext(AttrVec::const_iterator I) const { 169 while (Current != I && !isa<SpecificAttr>(*Current)) 170 ++Current; 171 } 172 173public: 174 typedef SpecificAttr* value_type; 175 typedef SpecificAttr* reference; 176 typedef SpecificAttr* pointer; 177 typedef std::forward_iterator_tag iterator_category; 178 typedef std::ptrdiff_t difference_type; 179 180 specific_attr_iterator() : Current() { } 181 explicit specific_attr_iterator(AttrVec::const_iterator i) : Current(i) { } 182 183 reference operator*() const { 184 AdvanceToNext(); 185 return cast<SpecificAttr>(*Current); 186 } 187 pointer operator->() const { 188 AdvanceToNext(); 189 return cast<SpecificAttr>(*Current); 190 } 191 192 specific_attr_iterator& operator++() { 193 ++Current; 194 return *this; 195 } 196 specific_attr_iterator operator++(int) { 197 specific_attr_iterator Tmp(*this); 198 ++(*this); 199 return Tmp; 200 } 201 202 friend bool operator==(specific_attr_iterator Left, 203 specific_attr_iterator Right) { 204 if (Left.Current < Right.Current) 205 Left.AdvanceToNext(Right.Current); 206 else 207 Right.AdvanceToNext(Left.Current); 208 return Left.Current == Right.Current; 209 } 210 friend bool operator!=(specific_attr_iterator Left, 211 specific_attr_iterator Right) { 212 return !(Left == Right); 213 } 214}; 215 216template <typename T> 217inline specific_attr_iterator<T> specific_attr_begin(const AttrVec& vec) { 218 return specific_attr_iterator<T>(vec.begin()); 219} 220template <typename T> 221inline specific_attr_iterator<T> specific_attr_end(const AttrVec& vec) { 222 return specific_attr_iterator<T>(vec.end()); 223} 224 225template <typename T> 226inline bool hasSpecificAttr(const AttrVec& vec) { 227 return specific_attr_begin<T>(vec) != specific_attr_end<T>(vec); 228} 229template <typename T> 230inline T *getSpecificAttr(const AttrVec& vec) { 231 specific_attr_iterator<T> i = specific_attr_begin<T>(vec); 232 if (i != specific_attr_end<T>(vec)) 233 return *i; 234 else 235 return 0; 236} 237 238/// getMaxAlignment - Returns the highest alignment value found among 239/// AlignedAttrs in an AttrVec, or 0 if there are none. 240inline unsigned getMaxAttrAlignment(const AttrVec& V, ASTContext &Ctx) { 241 unsigned Align = 0; 242 specific_attr_iterator<AlignedAttr> i(V.begin()), e(V.end()); 243 for(; i != e; ++i) 244 Align = std::max(Align, i->getAlignment(Ctx)); 245 return Align; 246} 247 248} // end namespace clang 249 250#endif 251