1 //===- UnresolvedSet.h - Unresolved sets of declarations --------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines the UnresolvedSet class, which is used to store 10 // collections of declarations in the AST. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CLANG_AST_UNRESOLVEDSET_H 15 #define LLVM_CLANG_AST_UNRESOLVEDSET_H 16 17 #include "clang/AST/DeclAccessPair.h" 18 #include "clang/Basic/LLVM.h" 19 #include "clang/Basic/Specifiers.h" 20 #include "llvm/ADT/ArrayRef.h" 21 #include "llvm/ADT/SmallVector.h" 22 #include "llvm/ADT/iterator.h" 23 #include <cstddef> 24 #include <iterator> 25 26 namespace clang { 27 28 class NamedDecl; 29 30 /// The iterator over UnresolvedSets. Serves as both the const and 31 /// non-const iterator. 32 class UnresolvedSetIterator : public llvm::iterator_adaptor_base< 33 UnresolvedSetIterator, DeclAccessPair *, 34 std::random_access_iterator_tag, NamedDecl *, 35 std::ptrdiff_t, NamedDecl *, NamedDecl *> { 36 friend class ASTUnresolvedSet; 37 friend class OverloadExpr; 38 friend class UnresolvedSetImpl; 39 UnresolvedSetIterator(DeclAccessPair * Iter)40 explicit UnresolvedSetIterator(DeclAccessPair *Iter) 41 : iterator_adaptor_base(Iter) {} UnresolvedSetIterator(const DeclAccessPair * Iter)42 explicit UnresolvedSetIterator(const DeclAccessPair *Iter) 43 : iterator_adaptor_base(const_cast<DeclAccessPair *>(Iter)) {} 44 45 public: 46 // Work around a bug in MSVC 2013 where explicitly default constructed 47 // temporaries with defaulted ctors are not zero initialized. UnresolvedSetIterator()48 UnresolvedSetIterator() : iterator_adaptor_base(nullptr) {} 49 getDecl()50 NamedDecl *getDecl() const { return I->getDecl(); } setDecl(NamedDecl * ND)51 void setDecl(NamedDecl *ND) const { return I->setDecl(ND); } getAccess()52 AccessSpecifier getAccess() const { return I->getAccess(); } setAccess(AccessSpecifier AS)53 void setAccess(AccessSpecifier AS) { I->setAccess(AS); } getPair()54 const DeclAccessPair &getPair() const { return *I; } 55 56 NamedDecl *operator*() const { return getDecl(); } 57 NamedDecl *operator->() const { return **this; } 58 }; 59 60 /// A set of unresolved declarations. 61 class UnresolvedSetImpl { 62 using DeclsTy = SmallVectorImpl<DeclAccessPair>; 63 64 // Don't allow direct construction, and only permit subclassing by 65 // UnresolvedSet. 66 private: 67 template <unsigned N> friend class UnresolvedSet; 68 69 UnresolvedSetImpl() = default; 70 UnresolvedSetImpl(const UnresolvedSetImpl &) = default; 71 UnresolvedSetImpl &operator=(const UnresolvedSetImpl &) = default; 72 73 // FIXME: Switch these to "= default" once MSVC supports generating move ops UnresolvedSetImpl(UnresolvedSetImpl &&)74 UnresolvedSetImpl(UnresolvedSetImpl &&) {} 75 UnresolvedSetImpl &operator=(UnresolvedSetImpl &&) { return *this; } 76 77 public: 78 // We don't currently support assignment through this iterator, so we might 79 // as well use the same implementation twice. 80 using iterator = UnresolvedSetIterator; 81 using const_iterator = UnresolvedSetIterator; 82 begin()83 iterator begin() { return iterator(decls().begin()); } end()84 iterator end() { return iterator(decls().end()); } 85 begin()86 const_iterator begin() const { return const_iterator(decls().begin()); } end()87 const_iterator end() const { return const_iterator(decls().end()); } 88 pairs()89 ArrayRef<DeclAccessPair> pairs() const { return decls(); } 90 addDecl(NamedDecl * D)91 void addDecl(NamedDecl *D) { 92 addDecl(D, AS_none); 93 } 94 addDecl(NamedDecl * D,AccessSpecifier AS)95 void addDecl(NamedDecl *D, AccessSpecifier AS) { 96 decls().push_back(DeclAccessPair::make(D, AS)); 97 } 98 99 /// Replaces the given declaration with the new one, once. 100 /// 101 /// \return true if the set changed replace(const NamedDecl * Old,NamedDecl * New)102 bool replace(const NamedDecl* Old, NamedDecl *New) { 103 for (DeclsTy::iterator I = decls().begin(), E = decls().end(); I != E; ++I) 104 if (I->getDecl() == Old) 105 return (I->setDecl(New), true); 106 return false; 107 } 108 109 /// Replaces the declaration at the given iterator with the new one, 110 /// preserving the original access bits. replace(iterator I,NamedDecl * New)111 void replace(iterator I, NamedDecl *New) { I.I->setDecl(New); } 112 replace(iterator I,NamedDecl * New,AccessSpecifier AS)113 void replace(iterator I, NamedDecl *New, AccessSpecifier AS) { 114 I.I->set(New, AS); 115 } 116 erase(unsigned I)117 void erase(unsigned I) { decls()[I] = decls().pop_back_val(); } 118 erase(iterator I)119 void erase(iterator I) { *I.I = decls().pop_back_val(); } 120 setAccess(iterator I,AccessSpecifier AS)121 void setAccess(iterator I, AccessSpecifier AS) { I.I->setAccess(AS); } 122 clear()123 void clear() { decls().clear(); } set_size(unsigned N)124 void set_size(unsigned N) { decls().set_size(N); } 125 empty()126 bool empty() const { return decls().empty(); } size()127 unsigned size() const { return decls().size(); } 128 append(iterator I,iterator E)129 void append(iterator I, iterator E) { decls().append(I.I, E.I); } 130 assign(Iter I,Iter E)131 template<typename Iter> void assign(Iter I, Iter E) { decls().assign(I, E); } 132 133 DeclAccessPair &operator[](unsigned I) { return decls()[I]; } 134 const DeclAccessPair &operator[](unsigned I) const { return decls()[I]; } 135 136 private: 137 // These work because the only permitted subclass is UnresolvedSetImpl 138 decls()139 DeclsTy &decls() { 140 return *reinterpret_cast<DeclsTy*>(this); 141 } decls()142 const DeclsTy &decls() const { 143 return *reinterpret_cast<const DeclsTy*>(this); 144 } 145 }; 146 147 /// A set of unresolved declarations. 148 template <unsigned InlineCapacity> class UnresolvedSet : 149 public UnresolvedSetImpl { 150 SmallVector<DeclAccessPair, InlineCapacity> Decls; 151 }; 152 153 154 } // namespace clang 155 156 #endif // LLVM_CLANG_AST_UNRESOLVEDSET_H 157