Attr.h revision 243830
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, 109 const PrintingPolicy &Policy) const = 0; 110}; 111 112class InheritableAttr : public Attr { 113 virtual void anchor(); 114protected: 115 InheritableAttr(attr::Kind AK, SourceRange R) 116 : Attr(AK, R) {} 117 118public: 119 void setInherited(bool I) { Inherited = I; } 120 121 // Implement isa/cast/dyncast/etc. 122 static bool classof(const Attr *A) { 123 return A->getKind() <= attr::LAST_INHERITABLE; 124 } 125}; 126 127class InheritableParamAttr : public InheritableAttr { 128 virtual void anchor(); 129protected: 130 InheritableParamAttr(attr::Kind AK, SourceRange R) 131 : InheritableAttr(AK, R) {} 132 133public: 134 // Implement isa/cast/dyncast/etc. 135 static bool classof(const Attr *A) { 136 return A->getKind() <= attr::LAST_INHERITABLE_PARAM; 137 } 138}; 139 140#include "clang/AST/Attrs.inc" 141 142/// AttrVec - A vector of Attr, which is how they are stored on the AST. 143typedef SmallVector<Attr*, 2> AttrVec; 144typedef SmallVector<const Attr*, 2> ConstAttrVec; 145 146/// specific_attr_iterator - Iterates over a subrange of an AttrVec, only 147/// providing attributes that are of a specifc type. 148template <typename SpecificAttr, typename Container = AttrVec> 149class specific_attr_iterator { 150 typedef typename Container::const_iterator Iterator; 151 152 /// Current - The current, underlying iterator. 153 /// In order to ensure we don't dereference an invalid iterator unless 154 /// specifically requested, we don't necessarily advance this all the 155 /// way. Instead, we advance it when an operation is requested; if the 156 /// operation is acting on what should be a past-the-end iterator, 157 /// then we offer no guarantees, but this way we do not dererence a 158 /// past-the-end iterator when we move to a past-the-end position. 159 mutable Iterator Current; 160 161 void AdvanceToNext() const { 162 while (!isa<SpecificAttr>(*Current)) 163 ++Current; 164 } 165 166 void AdvanceToNext(Iterator I) const { 167 while (Current != I && !isa<SpecificAttr>(*Current)) 168 ++Current; 169 } 170 171public: 172 typedef SpecificAttr* value_type; 173 typedef SpecificAttr* reference; 174 typedef SpecificAttr* pointer; 175 typedef std::forward_iterator_tag iterator_category; 176 typedef std::ptrdiff_t difference_type; 177 178 specific_attr_iterator() : Current() { } 179 explicit specific_attr_iterator(Iterator i) : Current(i) { } 180 181 reference operator*() const { 182 AdvanceToNext(); 183 return cast<SpecificAttr>(*Current); 184 } 185 pointer operator->() const { 186 AdvanceToNext(); 187 return cast<SpecificAttr>(*Current); 188 } 189 190 specific_attr_iterator& operator++() { 191 ++Current; 192 return *this; 193 } 194 specific_attr_iterator operator++(int) { 195 specific_attr_iterator Tmp(*this); 196 ++(*this); 197 return Tmp; 198 } 199 200 friend bool operator==(specific_attr_iterator Left, 201 specific_attr_iterator Right) { 202 if (Left.Current < Right.Current) 203 Left.AdvanceToNext(Right.Current); 204 else 205 Right.AdvanceToNext(Left.Current); 206 return Left.Current == Right.Current; 207 } 208 friend bool operator!=(specific_attr_iterator Left, 209 specific_attr_iterator Right) { 210 return !(Left == Right); 211 } 212}; 213 214template <typename SpecificAttr, typename Container> 215inline specific_attr_iterator<SpecificAttr, Container> 216 specific_attr_begin(const Container& container) { 217 return specific_attr_iterator<SpecificAttr, Container>(container.begin()); 218} 219template <typename SpecificAttr, typename Container> 220inline specific_attr_iterator<SpecificAttr, Container> 221 specific_attr_end(const Container& container) { 222 return specific_attr_iterator<SpecificAttr, Container>(container.end()); 223} 224 225template <typename SpecificAttr, typename Container> 226inline bool hasSpecificAttr(const Container& container) { 227 return specific_attr_begin<SpecificAttr>(container) != 228 specific_attr_end<SpecificAttr>(container); 229} 230template <typename SpecificAttr, typename Container> 231inline SpecificAttr *getSpecificAttr(const Container& container) { 232 specific_attr_iterator<SpecificAttr, Container> i = 233 specific_attr_begin<SpecificAttr>(container); 234 if (i != specific_attr_end<SpecificAttr>(container)) 235 return *i; 236 else 237 return 0; 238} 239 240/// getMaxAlignment - Returns the highest alignment value found among 241/// AlignedAttrs in an AttrVec, or 0 if there are none. 242inline unsigned getMaxAttrAlignment(const AttrVec& V, ASTContext &Ctx) { 243 unsigned Align = 0; 244 specific_attr_iterator<AlignedAttr> i(V.begin()), e(V.end()); 245 for(; i != e; ++i) 246 Align = std::max(Align, i->getAlignment(Ctx)); 247 return Align; 248} 249 250} // end namespace clang 251 252#endif 253