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//===- DeclLookups.h - Low-level interface to all names in a DC -*- 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 DeclContext::all_lookups_iterator.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_DECLLOOKUPS_H
#define LLVM_CLANG_AST_DECLLOOKUPS_H
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclBase.h"
#include "clang/AST/DeclContextInternals.h"
#include "clang/AST/DeclarationName.h"
#include "clang/AST/ExternalASTSource.h"
#include <cstddef>
#include <iterator>
namespace clang {
/// all_lookups_iterator - An iterator that provides a view over the results
/// of looking up every possible name.
class DeclContext::all_lookups_iterator {
StoredDeclsMap::iterator It, End;
public:
using value_type = lookup_result;
using reference = lookup_result;
using pointer = lookup_result;
using iterator_category = std::forward_iterator_tag;
using difference_type = std::ptrdiff_t;
all_lookups_iterator() = default;
all_lookups_iterator(StoredDeclsMap::iterator It,
StoredDeclsMap::iterator End)
: It(It), End(End) {}
DeclarationName getLookupName() const { return It->first; }
reference operator*() const { return It->second.getLookupResult(); }
pointer operator->() const { return It->second.getLookupResult(); }
all_lookups_iterator& operator++() {
// Filter out using directives. They don't belong as results from name
// lookup anyways, except as an implementation detail. Users of the API
// should not expect to get them (or worse, rely on it).
do {
++It;
} while (It != End &&
It->first == DeclarationName::getUsingDirectiveName());
return *this;
}
all_lookups_iterator operator++(int) {
all_lookups_iterator tmp(*this);
++(*this);
return tmp;
}
friend bool operator==(all_lookups_iterator x, all_lookups_iterator y) {
return x.It == y.It;
}
friend bool operator!=(all_lookups_iterator x, all_lookups_iterator y) {
return x.It != y.It;
}
};
inline DeclContext::lookups_range DeclContext::lookups() const {
DeclContext *Primary = const_cast<DeclContext*>(this)->getPrimaryContext();
if (Primary->hasExternalVisibleStorage())
getParentASTContext().getExternalSource()->completeVisibleDeclsMap(Primary);
if (StoredDeclsMap *Map = Primary->buildLookup())
return lookups_range(all_lookups_iterator(Map->begin(), Map->end()),
all_lookups_iterator(Map->end(), Map->end()));
// Synthesize an empty range. This requires that two default constructed
// versions of these iterators form a valid empty range.
return lookups_range(all_lookups_iterator(), all_lookups_iterator());
}
inline DeclContext::lookups_range
DeclContext::noload_lookups(bool PreserveInternalState) const {
DeclContext *Primary = const_cast<DeclContext*>(this)->getPrimaryContext();
if (!PreserveInternalState)
Primary->loadLazyLocalLexicalLookups();
if (StoredDeclsMap *Map = Primary->getLookupPtr())
return lookups_range(all_lookups_iterator(Map->begin(), Map->end()),
all_lookups_iterator(Map->end(), Map->end()));
// Synthesize an empty range. This requires that two default constructed
// versions of these iterators form a valid empty range.
return lookups_range(all_lookups_iterator(), all_lookups_iterator());
}
} // namespace clang
#endif // LLVM_CLANG_AST_DECLLOOKUPS_H
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