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// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef NINJA_BUILD_H_
#define NINJA_BUILD_H_
#include <map>
#include <set>
#include <string>
#include <queue>
#include <vector>
#include <memory>
using namespace std;
#include "exit_status.h"
struct BuildLog;
struct Edge;
struct DiskInterface;
struct Node;
struct State;
/// Plan stores the state of a build plan: what we intend to build,
/// which steps we're ready to execute.
struct Plan {
Plan();
/// Add a target to our plan (including all its dependencies).
/// Returns false if we don't need to build this target; may
/// fill in |err| with an error message if there's a problem.
bool AddTarget(Node* node, string* err);
// Pop a ready edge off the queue of edges to build.
// Returns NULL if there's no work to do.
Edge* FindWork();
/// Returns true if there's more work to be done.
bool more_to_do() const { return wanted_edges_; }
/// Dumps the current state of the plan.
void Dump();
/// Mark an edge as done building. Used internally and by
/// tests.
void EdgeFinished(Edge* edge);
/// Clean the given node during the build.
void CleanNode(BuildLog* build_log, Node* node);
/// Number of edges with commands to run.
int command_edge_count() const { return command_edges_; }
private:
bool AddSubTarget(Node* node, vector<Node*>* stack, string* err);
bool CheckDependencyCycle(Node* node, vector<Node*>* stack, string* err);
void NodeFinished(Node* node);
/// Keep track of which edges we want to build in this plan. If this map does
/// not contain an entry for an edge, we do not want to build the entry or its
/// dependents. If an entry maps to false, we do not want to build it, but we
/// might want to build one of its dependents. If the entry maps to true, we
/// want to build it.
map<Edge*, bool> want_;
set<Edge*> ready_;
/// Total number of edges that have commands (not phony).
int command_edges_;
/// Total remaining number of wanted edges.
int wanted_edges_;
};
/// CommandRunner is an interface that wraps running the build
/// subcommands. This allows tests to abstract out running commands.
/// RealCommandRunner is an implementation that actually runs commands.
struct CommandRunner {
virtual ~CommandRunner() {}
virtual bool CanRunMore() = 0;
virtual bool StartCommand(Edge* edge) = 0;
/// Wait for a command to complete.
virtual Edge* WaitForCommand(ExitStatus* status, string* output) = 0;
virtual vector<Edge*> GetActiveEdges() { return vector<Edge*>(); }
virtual void Abort() {}
};
/// Options (e.g. verbosity, parallelism) passed to a build.
struct BuildConfig {
BuildConfig() : verbosity(NORMAL), dry_run(false), parallelism(1),
failures_allowed(1) {}
enum Verbosity {
NORMAL,
QUIET, // No output -- used when testing.
VERBOSE
};
Verbosity verbosity;
bool dry_run;
int parallelism;
int failures_allowed;
};
/// Builder wraps the build process: starting commands, updating status.
struct Builder {
Builder(State* state, const BuildConfig& config);
~Builder();
Node* AddTarget(const string& name, string* err);
/// Add a target to the build, scanning dependencies.
/// @return false on error.
bool AddTarget(Node* target, string* err);
/// Returns true if the build targets are already up to date.
bool AlreadyUpToDate() const;
/// Run the build. Returns false on error.
/// It is an error to call this function when AlreadyUpToDate() is true.
bool Build(string* err);
bool StartEdge(Edge* edge, string* err);
void FinishEdge(Edge* edge, bool success, const string& output);
State* state_;
const BuildConfig& config_;
Plan plan_;
DiskInterface* disk_interface_;
auto_ptr<CommandRunner> command_runner_;
struct BuildStatus* status_;
struct BuildLog* log_;
private:
// Unimplemented copy ctor and operator= ensure we don't copy the auto_ptr.
Builder(const Builder &other); // DO NOT IMPLEMENT
void operator=(const Builder &other); // DO NOT IMPLEMENT
};
#endif // NINJA_BUILD_H_
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