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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_GRAPH_H_
#define NINJA_GRAPH_H_
#include <string>
#include <vector>
using namespace std;
#include "eval_env.h"
struct DiskInterface;
struct Node;
/// Information about a single on-disk file: path, mtime.
struct FileStat {
FileStat(const string& path) : path_(path), mtime_(-1), node_(NULL) {}
/// Return true if the file exists (mtime_ got a value).
bool Stat(DiskInterface* disk_interface);
/// Return true if we needed to stat.
bool StatIfNecessary(DiskInterface* disk_interface) {
if (status_known())
return false;
Stat(disk_interface);
return true;
}
bool exists() const {
return mtime_ != 0;
}
bool status_known() const {
return mtime_ != -1;
}
string path_;
// Possible values of mtime_:
// -1: file hasn't been examined
// 0: we looked, and file doesn't exist
// >0: actual file's mtime
time_t mtime_;
Node* node_;
};
/// An invokable build command and associated metadata (description, etc.).
struct Rule {
Rule(const string& name) : name_(name), generator_(false) { }
bool ParseCommand(const string& command, string* err) {
return command_.Parse(command, err);
}
string name_;
EvalString command_;
EvalString description_;
EvalString depfile_;
bool generator_;
};
struct BuildLog;
struct Node;
struct State;
/// An edge in the dependency graph; links between Nodes using Rules.
struct Edge {
Edge() : rule_(NULL), env_(NULL), outputs_ready_(false), implicit_deps_(0),
order_only_deps_(0) {}
bool RecomputeDirty(State* state, DiskInterface* disk_interface, string* err);
void RecomputeOutputDirty(BuildLog* build_log, time_t most_recent_input,
bool dirty, const string& command, Node* output);
string EvaluateCommand(); // XXX move to env, take env ptr
string GetDescription();
bool LoadDepFile(State* state, DiskInterface* disk_interface, string* err);
void Dump();
const Rule* rule_;
vector<Node*> inputs_;
vector<Node*> outputs_;
Env* env_;
bool outputs_ready_;
bool outputs_ready() const { return outputs_ready_; }
// XXX 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.
// Currently we stuff all of these into inputs_ and keep counts of #2 and #3
// when we need to compute subsets. This is suboptimal; should think of a
// better representation. (Could make each pointer into a pair of a pointer
// and a type of input, or if memory matters could use the low bits of the
// pointer...)
int implicit_deps_;
int order_only_deps_;
bool is_implicit(int index) {
return index >= ((int)inputs_.size()) - order_only_deps_ - implicit_deps_ &&
!is_order_only(index);
}
bool is_order_only(int index) {
return index >= ((int)inputs_.size()) - order_only_deps_;
}
bool is_phony() const;
};
/// Information about a node in the dependency graph: the file, whether
/// it's dirty, etc.
struct Node {
Node(FileStat* file) : file_(file), dirty_(false), in_edge_(NULL) {}
bool dirty() const { return dirty_; }
bool ready() const { return !in_edge_ || in_edge_->outputs_ready(); }
FileStat* file_;
bool dirty_;
Edge* in_edge_;
vector<Edge*> out_edges_;
};
#endif // NINJA_GRAPH_H_
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