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//===- UnresolvedSet.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 defines the UnresolvedSet class, which is used to store
// collections of declarations in the AST.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_UNRESOLVEDSET_H
#define LLVM_CLANG_AST_UNRESOLVEDSET_H
#include "clang/AST/DeclAccessPair.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/Specifiers.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/iterator.h"
#include <cstddef>
#include <iterator>
namespace clang {
class NamedDecl;
/// The iterator over UnresolvedSets. Serves as both the const and
/// non-const iterator.
class UnresolvedSetIterator : public llvm::iterator_adaptor_base<
UnresolvedSetIterator, DeclAccessPair *,
std::random_access_iterator_tag, NamedDecl *,
std::ptrdiff_t, NamedDecl *, NamedDecl *> {
friend class ASTUnresolvedSet;
friend class OverloadExpr;
friend class UnresolvedSetImpl;
explicit UnresolvedSetIterator(DeclAccessPair *Iter)
: iterator_adaptor_base(Iter) {}
explicit UnresolvedSetIterator(const DeclAccessPair *Iter)
: iterator_adaptor_base(const_cast<DeclAccessPair *>(Iter)) {}
public:
// Work around a bug in MSVC 2013 where explicitly default constructed
// temporaries with defaulted ctors are not zero initialized.
UnresolvedSetIterator() : iterator_adaptor_base(nullptr) {}
NamedDecl *getDecl() const { return I->getDecl(); }
void setDecl(NamedDecl *ND) const { return I->setDecl(ND); }
AccessSpecifier getAccess() const { return I->getAccess(); }
void setAccess(AccessSpecifier AS) { I->setAccess(AS); }
const DeclAccessPair &getPair() const { return *I; }
NamedDecl *operator*() const { return getDecl(); }
NamedDecl *operator->() const { return **this; }
};
/// A set of unresolved declarations.
class UnresolvedSetImpl {
using DeclsTy = SmallVectorImpl<DeclAccessPair>;
// Don't allow direct construction, and only permit subclassing by
// UnresolvedSet.
private:
template <unsigned N> friend class UnresolvedSet;
UnresolvedSetImpl() = default;
UnresolvedSetImpl(const UnresolvedSetImpl &) = default;
UnresolvedSetImpl &operator=(const UnresolvedSetImpl &) = default;
// FIXME: Switch these to "= default" once MSVC supports generating move ops
UnresolvedSetImpl(UnresolvedSetImpl &&) {}
UnresolvedSetImpl &operator=(UnresolvedSetImpl &&) { return *this; }
public:
// We don't currently support assignment through this iterator, so we might
// as well use the same implementation twice.
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(NamedDecl *D) {
addDecl(D, AS_none);
}
void addDecl(NamedDecl *D, AccessSpecifier AS) {
decls().push_back(DeclAccessPair::make(D, AS));
}
/// Replaces the given declaration with the new one, once.
///
/// \return true if the set changed
bool replace(const NamedDecl* Old, NamedDecl *New) {
for (DeclsTy::iterator I = decls().begin(), E = decls().end(); I != E; ++I)
if (I->getDecl() == Old)
return (I->setDecl(New), true);
return false;
}
/// Replaces the declaration at the given iterator with the new one,
/// preserving the original access bits.
void replace(iterator I, NamedDecl *New) { I.I->setDecl(New); }
void replace(iterator I, NamedDecl *New, AccessSpecifier AS) {
I.I->set(New, AS);
}
void erase(unsigned I) { decls()[I] = decls().pop_back_val(); }
void erase(iterator I) { *I.I = decls().pop_back_val(); }
void setAccess(iterator I, AccessSpecifier AS) { I.I->setAccess(AS); }
void clear() { decls().clear(); }
void set_size(unsigned N) { decls().set_size(N); }
bool empty() const { return decls().empty(); }
unsigned size() const { return decls().size(); }
void append(iterator I, iterator E) { decls().append(I.I, E.I); }
DeclAccessPair &operator[](unsigned I) { return decls()[I]; }
const DeclAccessPair &operator[](unsigned I) const { return decls()[I]; }
private:
// These work because the only permitted subclass is UnresolvedSetImpl
DeclsTy &decls() {
return *reinterpret_cast<DeclsTy*>(this);
}
const DeclsTy &decls() const {
return *reinterpret_cast<const DeclsTy*>(this);
}
};
/// A set of unresolved declarations.
template <unsigned InlineCapacity> class UnresolvedSet :
public UnresolvedSetImpl {
SmallVector<DeclAccessPair, InlineCapacity> Decls;
};
} // namespace clang
#endif // LLVM_CLANG_AST_UNRESOLVEDSET_H
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