1 //===- ASTCommon.h - Common stuff for ASTReader/ASTWriter -*- 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 common functions that both ASTReader and ASTWriter use. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CLANG_LIB_SERIALIZATION_ASTCOMMON_H 15 #define LLVM_CLANG_LIB_SERIALIZATION_ASTCOMMON_H 16 17 #include "clang/AST/ASTContext.h" 18 #include "clang/AST/DeclFriend.h" 19 #include "clang/Serialization/ASTBitCodes.h" 20 21 namespace clang { 22 23 namespace serialization { 24 25 enum DeclUpdateKind { 26 UPD_CXX_ADDED_IMPLICIT_MEMBER, 27 UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION, 28 UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, 29 UPD_CXX_ADDED_FUNCTION_DEFINITION, 30 UPD_CXX_INSTANTIATED_STATIC_DATA_MEMBER, 31 UPD_CXX_INSTANTIATED_CLASS_DEFINITION, 32 UPD_CXX_RESOLVED_EXCEPTION_SPEC, 33 UPD_CXX_DEDUCED_RETURN_TYPE, 34 UPD_DECL_MARKED_USED, 35 UPD_MANGLING_NUMBER, 36 UPD_STATIC_LOCAL_NUMBER, 37 UPD_DECL_MARKED_OPENMP_THREADPRIVATE 38 }; 39 40 TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT); 41 42 template <typename IdxForTypeTy> 43 TypeID MakeTypeID(ASTContext &Context, QualType T, IdxForTypeTy IdxForType) { 44 if (T.isNull()) 45 return PREDEF_TYPE_NULL_ID; 46 47 unsigned FastQuals = T.getLocalFastQualifiers(); 48 T.removeLocalFastQualifiers(); 49 50 if (T.hasLocalNonFastQualifiers()) 51 return IdxForType(T).asTypeID(FastQuals); 52 53 assert(!T.hasLocalQualifiers()); 54 55 if (const BuiltinType *BT = dyn_cast<BuiltinType>(T.getTypePtr())) 56 return TypeIdxFromBuiltin(BT).asTypeID(FastQuals); 57 58 if (T == Context.AutoDeductTy) 59 return TypeIdx(PREDEF_TYPE_AUTO_DEDUCT).asTypeID(FastQuals); 60 if (T == Context.AutoRRefDeductTy) 61 return TypeIdx(PREDEF_TYPE_AUTO_RREF_DEDUCT).asTypeID(FastQuals); 62 if (T == Context.VaListTagTy) 63 return TypeIdx(PREDEF_TYPE_VA_LIST_TAG).asTypeID(FastQuals); 64 65 return IdxForType(T).asTypeID(FastQuals); 66 } 67 68 unsigned ComputeHash(Selector Sel); 69 70 /// \brief Retrieve the "definitive" declaration that provides all of the 71 /// visible entries for the given declaration context, if there is one. 72 /// 73 /// The "definitive" declaration is the only place where we need to look to 74 /// find information about the declarations within the given declaration 75 /// context. For example, C++ and Objective-C classes, C structs/unions, and 76 /// Objective-C protocols, categories, and extensions are all defined in a 77 /// single place in the source code, so they have definitive declarations 78 /// associated with them. C++ namespaces, on the other hand, can have 79 /// multiple definitions. 80 const DeclContext *getDefinitiveDeclContext(const DeclContext *DC); 81 82 /// \brief Determine whether the given declaration kind is redeclarable. 83 bool isRedeclarableDeclKind(unsigned Kind); 84 85 /// \brief Determine whether the given declaration needs an anonymous 86 /// declaration number. 87 bool needsAnonymousDeclarationNumber(const NamedDecl *D); 88 89 /// \brief Visit each declaration within \c DC that needs an anonymous 90 /// declaration number and call \p Visit with the declaration and its number. 91 template<typename Fn> void numberAnonymousDeclsWithin(const DeclContext *DC, 92 Fn Visit) { 93 unsigned Index = 0; 94 for (Decl *LexicalD : DC->decls()) { 95 // For a friend decl, we care about the declaration within it, if any. 96 if (auto *FD = dyn_cast<FriendDecl>(LexicalD)) 97 LexicalD = FD->getFriendDecl(); 98 99 auto *ND = dyn_cast_or_null<NamedDecl>(LexicalD); 100 if (!ND || !needsAnonymousDeclarationNumber(ND)) 101 continue; 102 103 Visit(ND, Index++); 104 } 105 } 106 107 } // namespace serialization 108 109 } // namespace clang 110 111 #endif 112