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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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef NINJA_BUILD_H_
#define NINJA_BUILD_H_
#include <set>
#include <string>
#include <queue>
#include <vector>
using namespace std;
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 {
// 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 !want_.empty(); }
// Dumps the current state of the plan.
void Dump();
// Mark an edge as done building. Used internally and by
// tests.
void EdgeFinished(Edge* edge);
// Number of edges with commands to run.
int command_edge_count() const { return command_edges_; }
bool AddSubTarget(Node* node, vector<Node*>* stack, string* err);
bool CheckDependencyCycle(Node* node, vector<Node*>* stack, string* err);
void NodeFinished(Node* node);
set<Edge*> want_;
set<Edge*> ready_;
// Total number of edges that have commands (not phony).
int command_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 commands to make progress; return false if there is no
// progress to be made.
virtual bool WaitForCommands() = 0;
virtual Edge* NextFinishedCommand(bool* success) = 0;
struct BuildConfig {
BuildConfig() : verbosity(NORMAL), dry_run(false), parallelism(1) {}
enum Verbosity {
QUIET, // No output -- used when testing.
Verbosity verbosity;
bool dry_run;
int parallelism;
struct Builder {
Builder(State* state, const BuildConfig& config);
Node* AddTarget(const string& name, string* err);
bool Build(string* err);
bool StartEdge(Edge* edge, string* err);
void FinishEdge(Edge* edge);
State* state_;
Plan plan_;
DiskInterface* disk_interface_;
CommandRunner* command_runner_;
struct BuildStatus* status_;
struct BuildLog* log_;
#endif // NINJA_BUILD_H_
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