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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include <set>
#include <utility>
#include "gn/item.h"
#include "gn/location.h"
class ParseNode;
// This class is used by the builder to manage the loading of the dependency
// tree. It holds a reference to an item and links to other records that the
// item depends on, both resolved ones, and unresolved ones.
// If a target depends on another one that hasn't been defined yet, we'll make
// a placeholder BuilderRecord with no item, and try to load the buildfile
// associated with the new item. The item will get filled in when we encounter
// the declaration for the item (or when we're done and realize there are
// undefined items).
// You can also have null item pointers when the target is not required for
// the current build (should_generate is false).
class BuilderRecord {
using BuilderRecordSet = std::set<BuilderRecord*>;
enum ItemType {
BuilderRecord(ItemType type, const Label& label);
ItemType type() const { return type_; }
const Label& label() const { return label_; }
// Returns a user-ready name for the given type. e.g. "target".
static const char* GetNameForType(ItemType type);
// Returns true if the given item is of the given type.
static bool IsItemOfType(const Item* item, ItemType type);
// Returns the type enum for the given item.
static ItemType TypeOfItem(const Item* item);
Item* item() { return item_.get(); }
const Item* item() const { return item_.get(); }
void set_item(std::unique_ptr<Item> item) { item_ = std::move(item); }
// Indicates from where this item was originally referenced from that caused
// it to be loaded. For targets for which we encountered the declaration
// before a reference, this will be the empty range.
const ParseNode* originally_referenced_from() const {
return originally_referenced_from_;
void set_originally_referenced_from(const ParseNode* pn) {
originally_referenced_from_ = pn;
bool should_generate() const { return should_generate_; }
void set_should_generate(bool sg) { should_generate_ = sg; }
bool resolved() const { return resolved_; }
void set_resolved(bool r) { resolved_ = r; }
bool can_resolve() const { return item_ && unresolved_deps_.empty(); }
// All records this one is depending on.
BuilderRecordSet& all_deps() { return all_deps_; }
const BuilderRecordSet& all_deps() const { return all_deps_; }
// Unresolved records this one is depending on. A subset of all... above.
BuilderRecordSet& unresolved_deps() { return unresolved_deps_; }
const BuilderRecordSet& unresolved_deps() const { return unresolved_deps_; }
// Records that are waiting on this one to be resolved. This is the other
// end of the "unresolved deps" arrow.
BuilderRecordSet& waiting_on_resolution() { return waiting_on_resolution_; }
const BuilderRecordSet& waiting_on_resolution() const {
return waiting_on_resolution_;
void AddDep(BuilderRecord* record);
ItemType type_;
Label label_;
std::unique_ptr<Item> item_;
const ParseNode* originally_referenced_from_ = nullptr;
bool should_generate_ = false;
bool resolved_ = false;
BuilderRecordSet all_deps_;
BuilderRecordSet unresolved_deps_;
BuilderRecordSet waiting_on_resolution_;
BuilderRecord(const BuilderRecord&) = delete;
BuilderRecord& operator=(const BuilderRecord&) = delete;