1 //===- ASTUnresolvedSet.h - Unresolved sets of declarations -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides an UnresolvedSet-like class, whose contents are
11 // allocated using the allocator associated with an ASTContext.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_AST_ASTUNRESOLVEDSET_H
16 #define LLVM_CLANG_AST_ASTUNRESOLVEDSET_H
18 #include "clang/AST/ASTVector.h"
19 #include "clang/AST/DeclAccessPair.h"
20 #include "clang/AST/UnresolvedSet.h"
21 #include "clang/Basic/Specifiers.h"
29 /// An UnresolvedSet-like class which uses the ASTContext's allocator.
30 class ASTUnresolvedSet {
31 friend class LazyASTUnresolvedSet;
33 struct DeclsTy : ASTVector<DeclAccessPair> {
35 DeclsTy(ASTContext &C, unsigned N) : ASTVector<DeclAccessPair>(C, N) {}
37 bool isLazy() const { return getTag(); }
38 void setLazy(bool Lazy) { setTag(Lazy); }
44 ASTUnresolvedSet() = default;
45 ASTUnresolvedSet(ASTContext &C, unsigned N) : Decls(C, N) {}
47 using iterator = UnresolvedSetIterator;
48 using const_iterator = UnresolvedSetIterator;
50 iterator begin() { return iterator(Decls.begin()); }
51 iterator end() { return iterator(Decls.end()); }
53 const_iterator begin() const { return const_iterator(Decls.begin()); }
54 const_iterator end() const { return const_iterator(Decls.end()); }
56 void addDecl(ASTContext &C, NamedDecl *D, AccessSpecifier AS) {
57 Decls.push_back(DeclAccessPair::make(D, AS), C);
60 /// Replaces the given declaration with the new one, once.
62 /// \return true if the set changed
63 bool replace(const NamedDecl *Old, NamedDecl *New, AccessSpecifier AS) {
64 for (DeclsTy::iterator I = Decls.begin(), E = Decls.end(); I != E; ++I) {
65 if (I->getDecl() == Old) {
73 void erase(unsigned I) { Decls[I] = Decls.pop_back_val(); }
75 void clear() { Decls.clear(); }
77 bool empty() const { return Decls.empty(); }
78 unsigned size() const { return Decls.size(); }
80 void reserve(ASTContext &C, unsigned N) {
84 void append(ASTContext &C, iterator I, iterator E) {
85 Decls.append(C, I.I, E.I);
88 DeclAccessPair &operator[](unsigned I) { return Decls[I]; }
89 const DeclAccessPair &operator[](unsigned I) const { return Decls[I]; }
92 /// An UnresolvedSet-like class that might not have been loaded from the
93 /// external AST source yet.
94 class LazyASTUnresolvedSet {
95 mutable ASTUnresolvedSet Impl;
97 void getFromExternalSource(ASTContext &C) const;
100 ASTUnresolvedSet &get(ASTContext &C) const {
101 if (Impl.Decls.isLazy())
102 getFromExternalSource(C);
106 void reserve(ASTContext &C, unsigned N) { Impl.reserve(C, N); }
108 void addLazyDecl(ASTContext &C, uintptr_t ID, AccessSpecifier AS) {
109 assert(Impl.empty() || Impl.Decls.isLazy());
110 Impl.Decls.setLazy(true);
111 Impl.addDecl(C, reinterpret_cast<NamedDecl *>(ID << 2), AS);
117 #endif // LLVM_CLANG_AST_ASTUNRESOLVEDSET_H