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/AST/AttrIterator.h" 18 #include "clang/AST/Decl.h" 19 #include "clang/AST/Type.h" 20 #include "clang/Basic/AttrKinds.h" 21 #include "clang/Basic/LLVM.h" 22 #include "clang/Basic/SourceLocation.h" 23 #include "clang/Basic/VersionTuple.h" 24 #include "llvm/ADT/SmallVector.h" 25 #include "llvm/ADT/StringRef.h" 26 #include "llvm/ADT/StringSwitch.h" 27 #include "llvm/Support/ErrorHandling.h" 28 #include "llvm/Support/raw_ostream.h" 29 #include <cassert> 30 #include <cstring> 31 32 namespace clang { 33 class ASTContext; 34 class IdentifierInfo; 35 class ObjCInterfaceDecl; 36 class Expr; 37 class QualType; 38 class FunctionDecl; 39 class TypeSourceInfo; 40 41 /// Attr - This represents one attribute. 42 class Attr { 43 private: 44 SourceRange Range; 45 unsigned AttrKind : 16; 46 47 protected: 48 /// An index into the spelling list of an 49 /// attribute defined in Attr.td file. 50 unsigned SpellingListIndex : 4; 51 52 bool Inherited : 1; 53 54 bool IsPackExpansion : 1; 55 56 virtual ~Attr(); 57 new(size_t bytes)58 void* operator new(size_t bytes) throw() { 59 llvm_unreachable("Attrs cannot be allocated with regular 'new'."); 60 } delete(void * data)61 void operator delete(void* data) throw() { 62 llvm_unreachable("Attrs cannot be released with regular 'delete'."); 63 } 64 65 public: 66 // Forward so that the regular new and delete do not hide global ones. 67 void* operator new(size_t Bytes, ASTContext &C, throw()68 size_t Alignment = 16) throw() { 69 return ::operator new(Bytes, C, Alignment); 70 } delete(void * Ptr,ASTContext & C,size_t Alignment)71 void operator delete(void *Ptr, ASTContext &C, 72 size_t Alignment) throw() { 73 return ::operator delete(Ptr, C, Alignment); 74 } 75 76 protected: 77 Attr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex = 0) Range(R)78 : Range(R), AttrKind(AK), SpellingListIndex(SpellingListIndex), 79 Inherited(false), IsPackExpansion(false) {} 80 81 public: 82 getKind()83 attr::Kind getKind() const { 84 return static_cast<attr::Kind>(AttrKind); 85 } 86 getSpellingListIndex()87 unsigned getSpellingListIndex() const { return SpellingListIndex; } 88 getLocation()89 SourceLocation getLocation() const { return Range.getBegin(); } getRange()90 SourceRange getRange() const { return Range; } setRange(SourceRange R)91 void setRange(SourceRange R) { Range = R; } 92 isInherited()93 bool isInherited() const { return Inherited; } 94 setPackExpansion(bool PE)95 void setPackExpansion(bool PE) { IsPackExpansion = PE; } isPackExpansion()96 bool isPackExpansion() const { return IsPackExpansion; } 97 98 // Clone this attribute. 99 virtual Attr *clone(ASTContext &C) const = 0; 100 isLateParsed()101 virtual bool isLateParsed() const { return false; } 102 103 // Pretty print this attribute. 104 virtual void printPretty(raw_ostream &OS, 105 const PrintingPolicy &Policy) const = 0; 106 }; 107 108 class InheritableAttr : public Attr { 109 virtual void anchor(); 110 protected: 111 InheritableAttr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex = 0) Attr(AK,R,SpellingListIndex)112 : Attr(AK, R, SpellingListIndex) {} 113 114 public: setInherited(bool I)115 void setInherited(bool I) { Inherited = I; } 116 117 // Implement isa/cast/dyncast/etc. classof(const Attr * A)118 static bool classof(const Attr *A) { 119 return A->getKind() <= attr::LAST_INHERITABLE; 120 } 121 }; 122 123 class InheritableParamAttr : public InheritableAttr { 124 virtual void anchor(); 125 protected: 126 InheritableParamAttr(attr::Kind AK, SourceRange R, 127 unsigned SpellingListIndex = 0) InheritableAttr(AK,R,SpellingListIndex)128 : InheritableAttr(AK, R, SpellingListIndex) {} 129 130 public: 131 // Implement isa/cast/dyncast/etc. classof(const Attr * A)132 static bool classof(const Attr *A) { 133 // Relies on relative order of enum emission with respect to MS inheritance 134 // attrs. 135 return A->getKind() <= attr::LAST_INHERITABLE_PARAM; 136 } 137 }; 138 139 class MSInheritanceAttr : public InheritableAttr { 140 virtual void anchor(); 141 protected: 142 MSInheritanceAttr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex = 0) InheritableAttr(AK,R,SpellingListIndex)143 : InheritableAttr(AK, R, SpellingListIndex) {} 144 145 public: 146 // Implement isa/cast/dyncast/etc. classof(const Attr * A)147 static bool classof(const Attr *A) { 148 // Relies on relative order of enum emission with respect to param attrs. 149 return (A->getKind() <= attr::LAST_MS_INHERITANCE && 150 A->getKind() > attr::LAST_INHERITABLE_PARAM); 151 } 152 }; 153 154 #include "clang/AST/Attrs.inc" 155 156 } // end namespace clang 157 158 #endif 159