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//===- ASTUnresolvedSet.h - Unresolved sets of declarations -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides an UnresolvedSet-like class, whose contents are
// allocated using the allocator associated with an ASTContext.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_ASTUNRESOLVEDSET_H
#define LLVM_CLANG_AST_ASTUNRESOLVEDSET_H
#include "clang/AST/ASTVector.h"
#include "clang/AST/DeclAccessPair.h"
#include "clang/AST/UnresolvedSet.h"
#include "clang/Basic/Specifiers.h"
#include <cassert>
#include <cstdint>
namespace clang {
class NamedDecl;
/// An UnresolvedSet-like class which uses the ASTContext's allocator.
class ASTUnresolvedSet {
friend class LazyASTUnresolvedSet;
struct DeclsTy : ASTVector<DeclAccessPair> {
DeclsTy() = default;
DeclsTy(ASTContext &C, unsigned N) : ASTVector<DeclAccessPair>(C, N) {}
bool isLazy() const { return getTag(); }
void setLazy(bool Lazy) { setTag(Lazy); }
};
DeclsTy Decls;
public:
ASTUnresolvedSet() = default;
ASTUnresolvedSet(ASTContext &C, unsigned N) : Decls(C, N) {}
using iterator = UnresolvedSetIterator;
using const_iterator = UnresolvedSetIterator;
iterator begin() { return iterator(Decls.begin()); }
iterator end() { return iterator(Decls.end()); }
const_iterator begin() const { return const_iterator(Decls.begin()); }
const_iterator end() const { return const_iterator(Decls.end()); }
void addDecl(ASTContext &C, NamedDecl *D, AccessSpecifier AS) {
Decls.push_back(DeclAccessPair::make(D, AS), C);
}
/// Replaces the given declaration with the new one, once.
///
/// \return true if the set changed
bool replace(const NamedDecl *Old, NamedDecl *New, AccessSpecifier AS) {
for (DeclsTy::iterator I = Decls.begin(), E = Decls.end(); I != E; ++I) {
if (I->getDecl() == Old) {
I->set(New, AS);
return true;
}
}
return false;
}
void erase(unsigned I) { Decls[I] = Decls.pop_back_val(); }
void clear() { Decls.clear(); }
bool empty() const { return Decls.empty(); }
unsigned size() const { return Decls.size(); }
void reserve(ASTContext &C, unsigned N) {
Decls.reserve(C, N);
}
void append(ASTContext &C, iterator I, iterator E) {
Decls.append(C, I.I, E.I);
}
DeclAccessPair &operator[](unsigned I) { return Decls[I]; }
const DeclAccessPair &operator[](unsigned I) const { return Decls[I]; }
};
/// An UnresolvedSet-like class that might not have been loaded from the
/// external AST source yet.
class LazyASTUnresolvedSet {
mutable ASTUnresolvedSet Impl;
void getFromExternalSource(ASTContext &C) const;
public:
ASTUnresolvedSet &get(ASTContext &C) const {
if (Impl.Decls.isLazy())
getFromExternalSource(C);
return Impl;
}
void reserve(ASTContext &C, unsigned N) { Impl.reserve(C, N); }
void addLazyDecl(ASTContext &C, uintptr_t ID, AccessSpecifier AS) {
assert(Impl.empty() || Impl.Decls.isLazy());
Impl.Decls.setLazy(true);
Impl.addDecl(C, reinterpret_cast<NamedDecl *>(ID << 2), AS);
}
};
} // namespace clang
#endif // LLVM_CLANG_AST_ASTUNRESOLVEDSET_H
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