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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.
#include "graph.h"
#include <stdio.h>
#include "build_log.h"
#include "ninja.h"
#include "parsers.h"
#include "util.h"
bool FileStat::Stat(DiskInterface* disk_interface) {
mtime_ = disk_interface->Stat(path_);
return mtime_ > 0;
}
bool Edge::RecomputeDirty(State* state, DiskInterface* disk_interface,
string* err) {
bool dirty = false;
if (!rule_->depfile_.empty()) {
if (!LoadDepFile(state, disk_interface, err))
return false;
}
time_t most_recent_input = 1;
for (vector<Node*>::iterator i = inputs_.begin(); i != inputs_.end(); ++i) {
if ((*i)->file_->StatIfNecessary(disk_interface)) {
if (Edge* edge = (*i)->in_edge_) {
if (!edge->RecomputeDirty(state, disk_interface, err))
return false;
} else {
// This input has no in-edge; it is dirty if it is missing.
(*i)->dirty_ = !(*i)->file_->exists();
}
}
if (is_order_only(i - inputs_.begin())) {
// Order-only deps only make us dirty if they're missing.
if (!(*i)->file_->exists())
dirty = true;
continue;
}
// If a regular input is dirty (or missing), we're dirty.
// Otherwise consider mtime.
if ((*i)->dirty_) {
dirty = true;
} else {
if ((*i)->file_->mtime_ > most_recent_input)
most_recent_input = (*i)->file_->mtime_;
}
}
string command = EvaluateCommand();
assert(!outputs_.empty());
for (vector<Node*>::iterator i = outputs_.begin(); i != outputs_.end(); ++i) {
// We may have other outputs, that our input-recursive traversal hasn't hit
// yet (or never will). Stat them if we haven't already.
(*i)->file_->StatIfNecessary(disk_interface);
// Output is dirty if we're dirty, we're missing the output,
// or if it's older than the most recent input mtime.
if (dirty || !(*i)->file_->exists() ||
(*i)->file_->mtime_ < most_recent_input) {
(*i)->dirty_ = true;
} else {
// May also be dirty due to the command changing since the last build.
BuildLog::LogEntry* entry;
if (state->build_log_ &&
(entry = state->build_log_->LookupByOutput((*i)->file_->path_))) {
if (command != entry->command)
(*i)->dirty_ = true;
}
}
}
return true;
}
/// An Env for an Edge, providing $in and $out.
struct EdgeEnv : public Env {
EdgeEnv(Edge* edge) : edge_(edge) {}
virtual string LookupVariable(const string& var) {
string result;
if (var == "in") {
int explicit_deps = edge_->inputs_.size() - edge_->implicit_deps_ -
edge_->order_only_deps_;
for (vector<Node*>::iterator i = edge_->inputs_.begin();
i != edge_->inputs_.end() && explicit_deps; ++i, --explicit_deps) {
if (!result.empty())
result.push_back(' ');
result.append((*i)->file_->path_);
}
} else if (var == "out") {
for (vector<Node*>::iterator i = edge_->outputs_.begin();
i != edge_->outputs_.end(); ++i) {
if (!result.empty())
result.push_back(' ');
result.append((*i)->file_->path_);
}
} else if (edge_->env_) {
return edge_->env_->LookupVariable(var);
}
return result;
}
Edge* edge_;
};
string Edge::EvaluateCommand() {
EdgeEnv env(this);
return rule_->command_.Evaluate(&env);
}
string Edge::GetDescription() {
EdgeEnv env(this);
return rule_->description_.Evaluate(&env);
}
bool Edge::LoadDepFile(State* state, DiskInterface* disk_interface,
string* err) {
EdgeEnv env(this);
string path = rule_->depfile_.Evaluate(&env);
string content = disk_interface->ReadFile(path, err);
if (!err->empty())
return false;
if (content.empty())
return true;
MakefileParser makefile;
string makefile_err;
if (!makefile.Parse(content, &makefile_err)) {
*err = path + ": " + makefile_err;
return false;
}
// Check that this depfile matches our output.
if (outputs_.size() != 1) {
*err = "expected only one output";
return false;
}
if (outputs_[0]->file_->path_ != makefile.out_) {
*err = "expected makefile to mention '" + outputs_[0]->file_->path_ + "', "
"got '" + makefile.out_ + "'";
return false;
}
// Add all its in-edges.
for (vector<string>::iterator i = makefile.ins_.begin();
i != makefile.ins_.end(); ++i) {
CanonicalizePath(&*i);
Node* node = state->GetNode(*i);
inputs_.insert(inputs_.end() - order_only_deps_, node);
node->out_edges_.push_back(this);
++implicit_deps_;
// 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.
if (!node->in_edge_) {
Edge* phony_edge = state->AddEdge(&State::kPhonyRule);
phony_edge->order_only_deps_ = 1;
node->in_edge_ = phony_edge;
phony_edge->outputs_.push_back(node);
}
}
return true;
}
void Edge::Dump() {
printf("[ ");
for (vector<Node*>::iterator i = inputs_.begin(); i != inputs_.end(); ++i) {
printf("%s ", (*i)->file_->path_.c_str());
}
printf("--%s-> ", rule_->name_.c_str());
for (vector<Node*>::iterator i = outputs_.begin(); i != outputs_.end(); ++i) {
printf("%s ", (*i)->file_->path_.c_str());
}
printf("]\n");
}
bool Edge::is_phony() const {
return rule_ == &State::kPhonyRule;
}
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