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// Copyright 2015 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 "dyndep.h"
#include <assert.h>
#include <stdio.h>
#include "debug_flags.h"
#include "disk_interface.h"
#include "dyndep_parser.h"
#include "graph.h"
#include "state.h"
#include "util.h"
using namespace std;
bool DyndepLoader::LoadDyndeps(Node* node, std::string* err) const {
DyndepFile ddf;
return LoadDyndeps(node, &ddf, err);
}
bool DyndepLoader::LoadDyndeps(Node* node, DyndepFile* ddf,
std::string* err) const {
// We are loading the dyndep file now so it is no longer pending.
node->set_dyndep_pending(false);
// Load the dyndep information from the file.
EXPLAIN("loading dyndep file '%s'", node->path().c_str());
if (!LoadDyndepFile(node, ddf, err))
return false;
// Update each edge that specified this node as its dyndep binding.
std::vector<Edge*> const& out_edges = node->out_edges();
for (std::vector<Edge*>::const_iterator oe = out_edges.begin();
oe != out_edges.end(); ++oe) {
Edge* const edge = *oe;
if (edge->dyndep_ != node)
continue;
DyndepFile::iterator ddi = ddf->find(edge);
if (ddi == ddf->end()) {
*err = ("'" + edge->outputs_[0]->path() + "' "
"not mentioned in its dyndep file "
"'" + node->path() + "'");
return false;
}
ddi->second.used_ = true;
Dyndeps const& dyndeps = ddi->second;
if (!UpdateEdge(edge, &dyndeps, err)) {
return false;
}
}
// Reject extra outputs in dyndep file.
for (DyndepFile::const_iterator oe = ddf->begin(); oe != ddf->end();
++oe) {
if (!oe->second.used_) {
Edge* const edge = oe->first;
*err = ("dyndep file '" + node->path() + "' mentions output "
"'" + edge->outputs_[0]->path() + "' whose build statement "
"does not have a dyndep binding for the file");
return false;
}
}
return true;
}
bool DyndepLoader::UpdateEdge(Edge* edge, Dyndeps const* dyndeps,
std::string* err) const {
// Add dyndep-discovered bindings to the edge.
// We know the edge already has its own binding
// scope because it has a "dyndep" binding.
if (dyndeps->restat_)
edge->env_->AddBinding("restat", "1");
// Add the dyndep-discovered outputs to the edge.
edge->outputs_.insert(edge->outputs_.end(),
dyndeps->implicit_outputs_.begin(),
dyndeps->implicit_outputs_.end());
edge->implicit_outs_ += dyndeps->implicit_outputs_.size();
// Add this edge as incoming to each new output.
for (std::vector<Node*>::const_iterator i =
dyndeps->implicit_outputs_.begin();
i != dyndeps->implicit_outputs_.end(); ++i) {
if (Edge* old_in_edge = (*i)->in_edge()) {
// This node already has an edge producing it. Fail with an error
// unless the edge was generated by ImplicitDepLoader, in which
// case we can replace it with the now-known real producer.
if (!old_in_edge->generated_by_dep_loader_) {
*err = "multiple rules generate " + (*i)->path();
return false;
}
old_in_edge->outputs_.clear();
}
(*i)->set_in_edge(edge);
}
// Add the dyndep-discovered inputs to the edge.
edge->inputs_.insert(edge->inputs_.end() - edge->order_only_deps_,
dyndeps->implicit_inputs_.begin(),
dyndeps->implicit_inputs_.end());
edge->implicit_deps_ += dyndeps->implicit_inputs_.size();
// Add this edge as outgoing from each new input.
for (std::vector<Node*>::const_iterator i =
dyndeps->implicit_inputs_.begin();
i != dyndeps->implicit_inputs_.end(); ++i)
(*i)->AddOutEdge(edge);
return true;
}
bool DyndepLoader::LoadDyndepFile(Node* file, DyndepFile* ddf,
std::string* err) const {
DyndepParser parser(state_, disk_interface_, ddf);
return parser.Load(file->path(), err);
}
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