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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_GRAPH_H_
#define NINJA_GRAPH_H_
#include <string>
#include <vector>
using namespace std;
#include "eval_env.h"
#include "timestamp.h"
struct BuildLog;
struct DiskInterface;
struct DepsLog;
struct Edge;
struct Node;
struct Pool;
struct State;
/// Information about a node in the dependency graph: the file, whether
/// it's dirty, mtime, etc.
struct Node {
Node(const string& path, unsigned int slash_bits)
: path_(path),
id_(-1) {}
/// Return false on error.
bool Stat(DiskInterface* disk_interface, string* err);
/// Return false on error.
bool StatIfNecessary(DiskInterface* disk_interface, string* err) {
if (status_known())
return true;
return Stat(disk_interface, err);
/// Mark as not-yet-stat()ed and not dirty.
void ResetState() {
mtime_ = -1;
dirty_ = false;
/// Mark the Node as already-stat()ed and missing.
void MarkMissing() {
mtime_ = 0;
bool exists() const {
return mtime_ != 0;
bool status_known() const {
return mtime_ != -1;
const string& path() const { return path_; }
/// Get |path()| but use slash_bits to convert back to original slash styles.
string PathDecanonicalized() const;
unsigned int slash_bits() const { return slash_bits_; }
TimeStamp mtime() const { return mtime_; }
bool dirty() const { return dirty_; }
void set_dirty(bool dirty) { dirty_ = dirty; }
void MarkDirty() { dirty_ = true; }
Edge* in_edge() const { return in_edge_; }
void set_in_edge(Edge* edge) { in_edge_ = edge; }
int id() const { return id_; }
void set_id(int id) { id_ = id; }
const vector<Edge*>& out_edges() const { return out_edges_; }
void AddOutEdge(Edge* edge) { out_edges_.push_back(edge); }
void Dump(const char* prefix="") const;
string path_;
/// Set bits starting from lowest for backslashes that were normalized to
/// forward slashes by CanonicalizePath. See |PathDecanonicalized|.
unsigned int slash_bits_;
/// Possible values of mtime_:
/// -1: file hasn't been examined
/// 0: we looked, and file doesn't exist
/// >0: actual file's mtime
TimeStamp mtime_;
/// Dirty is true when the underlying file is out-of-date.
/// But note that Edge::outputs_ready_ is also used in judging which
/// edges to build.
bool dirty_;
/// The Edge that produces this Node, or NULL when there is no
/// known edge to produce it.
Edge* in_edge_;
/// All Edges that use this Node as an input.
vector<Edge*> out_edges_;
/// A dense integer id for the node, assigned and used by DepsLog.
int id_;
/// An edge in the dependency graph; links between Nodes using Rules.
struct Edge {
Edge() : rule_(NULL), pool_(NULL), env_(NULL),
outputs_ready_(false), deps_missing_(false),
implicit_deps_(0), order_only_deps_(0) {}
/// Return true if all inputs' in-edges are ready.
bool AllInputsReady() const;
/// Expand all variables in a command and return it as a string.
/// If incl_rsp_file is enabled, the string will also contain the
/// full contents of a response file (if applicable)
string EvaluateCommand(bool incl_rsp_file = false);
/// Returns the shell-escaped value of |key|.
string GetBinding(const string& key);
bool GetBindingBool(const string& key);
/// Like GetBinding("depfile"), but without shell escaping.
string GetUnescapedDepfile();
/// Like GetBinding("rspfile"), but without shell escaping.
string GetUnescapedRspfile();
void Dump(const char* prefix="") const;
const Rule* rule_;
Pool* pool_;
vector<Node*> inputs_;
vector<Node*> outputs_;
BindingEnv* env_;
bool outputs_ready_;
bool deps_missing_;
const Rule& rule() const { return *rule_; }
Pool* pool() const { return pool_; }
int weight() const { return 1; }
bool outputs_ready() const { return outputs_ready_; }
// There are three types of inputs.
// 1) explicit deps, which show up as $in on the command line;
// 2) implicit deps, which the target depends on implicitly (e.g. C headers),
// and changes in them cause the target to rebuild;
// 3) order-only deps, which are needed before the target builds but which
// don't cause the target to rebuild.
// These are stored in inputs_ in that order, and we keep counts of
// #2 and #3 when we need to access the various subsets.
int implicit_deps_;
int order_only_deps_;
bool is_implicit(size_t index) {
return index >= inputs_.size() - order_only_deps_ - implicit_deps_ &&
bool is_order_only(size_t index) {
return index >= inputs_.size() - order_only_deps_;
bool is_phony() const;
bool use_console() const;
/// ImplicitDepLoader loads implicit dependencies, as referenced via the
/// "depfile" attribute in build files.
struct ImplicitDepLoader {
ImplicitDepLoader(State* state, DepsLog* deps_log,
DiskInterface* disk_interface)
: state_(state), disk_interface_(disk_interface), deps_log_(deps_log) {}
/// Load implicit dependencies for \a edge.
/// @return false on error (without filling \a err if info is just missing
// or out of date).
bool LoadDeps(Edge* edge, string* err);
DepsLog* deps_log() const {
return deps_log_;
/// Load implicit dependencies for \a edge from a depfile attribute.
/// @return false on error (without filling \a err if info is just missing).
bool LoadDepFile(Edge* edge, const string& path, string* err);
/// Load implicit dependencies for \a edge from the DepsLog.
/// @return false on error (without filling \a err if info is just missing).
bool LoadDepsFromLog(Edge* edge, string* err);
/// Preallocate \a count spaces in the input array on \a edge, returning
/// an iterator pointing at the first new space.
vector<Node*>::iterator PreallocateSpace(Edge* edge, int count);
/// If we don't have a edge that generates this input already,
/// create one; this makes us not abort if the input is missing,
/// but instead will rebuild in that circumstance.
void CreatePhonyInEdge(Node* node);
State* state_;
DiskInterface* disk_interface_;
DepsLog* deps_log_;
/// DependencyScan manages the process of scanning the files in a graph
/// and updating the dirty/outputs_ready state of all the nodes and edges.
struct DependencyScan {
DependencyScan(State* state, BuildLog* build_log, DepsLog* deps_log,
DiskInterface* disk_interface)
: build_log_(build_log),
dep_loader_(state, deps_log, disk_interface) {}
/// Examine inputs, outputs, and command lines to judge whether an edge
/// needs to be re-run, and update outputs_ready_ and each outputs' |dirty_|
/// state accordingly.
/// Returns false on failure.
bool RecomputeDirty(Edge* edge, string* err);
/// Recompute whether any output of the edge is dirty, if so sets |*dirty|.
/// Returns false on failure.
bool RecomputeOutputsDirty(Edge* edge, Node* most_recent_input,
bool* dirty, string* err);
BuildLog* build_log() const {
return build_log_;
void set_build_log(BuildLog* log) {
build_log_ = log;
DepsLog* deps_log() const {
return dep_loader_.deps_log();
/// Recompute whether a given single output should be marked dirty.
/// Returns true if so.
bool RecomputeOutputDirty(Edge* edge, Node* most_recent_input,
const string& command, Node* output);
BuildLog* build_log_;
DiskInterface* disk_interface_;
ImplicitDepLoader dep_loader_;
#endif // NINJA_GRAPH_H_
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