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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.
#ifndef TOOLS_GN_TARGET_MANAGER_H_
#define TOOLS_GN_TARGET_MANAGER_H_
#include <set>
#include <vector>
#include "base/basictypes.h"
#include "base/containers/hash_tables.h"
#include "base/synchronization/lock.h"
#include "tools/gn/target.h"
class BuildSettings;
class Err;
class ItemTree;
class LocationRange;
class ToolchainManager;
class Value;
// Manages all the targets in the system. This integrates with the ItemTree
// to manage the target-specific rules and creation.
//
// This class is threadsafe.
class TargetManager {
public:
explicit TargetManager(const BuildSettings* settings);
~TargetManager();
// Gets a reference to a named target. The given target name is created if
// it doesn't exist.
//
// The label should be fully specified in that it should include an
// explicit toolchain.
//
// |specified_from_here| should indicate the dependency or the target
// generator causing this access for error message generation.
//
// |dep_from| should be set when a target is getting a dep that it depends
// on. |dep_from| indicates the target that specified the dependency. It
// will be used to track outstanding dependencies so we can know when the
// target and all of its dependencies are complete. It should be null when
// getting a target for other reasons.
//
// On failure, |err| will be set.
//
// The returned pointer must not be dereferenced until it's generated, since
// it could be being generated on another thread.
Target* GetTarget(const Label& label,
const LocationRange& specified_from_here,
Target* dep_from,
Err* err);
// Called by a target when it has been loaded from the .gin file. Its
// dependencies may or may not be resolved yet.
bool TargetGenerationComplete(const Label& label, Err* err);
// Returns a list of all targets.
void GetAllTargets(std::vector<const Target*>* all_targets) const;
private:
const BuildSettings* build_settings_;
DISALLOW_COPY_AND_ASSIGN(TargetManager);
};
#endif // TOOLS_GN_TARGET_MANAGER_H
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