blob: 6de820746e99590855865765c305fc44a563f49f [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gn/ninja_generated_file_target_writer.h"
#include "gn/output_conversion.h"
#include "gn/output_file.h"
#include "gn/scheduler.h"
#include "gn/settings.h"
#include "gn/string_output_buffer.h"
#include "gn/string_utils.h"
#include "gn/target.h"
#include "gn/trace.h"
NinjaGeneratedFileTargetWriter::NinjaGeneratedFileTargetWriter(
const Target* target,
std::ostream& out)
: NinjaTargetWriter(target, out) {}
NinjaGeneratedFileTargetWriter::~NinjaGeneratedFileTargetWriter() = default;
void NinjaGeneratedFileTargetWriter::Run() {
// Write the file.
GenerateFile();
// A generated_file target should generate a phony target with dependencies
// on each of the deps and data_deps in the target. The actual collection is
// done at gen time, but to have correct input deps in ninja, we add output
// from generated_file targets as deps for the stamp.
std::vector<OutputFile> output_files = target_->computed_outputs();
std::vector<OutputFile> data_output_files;
const auto& target_deps = resolved().GetTargetDeps(target_);
for (const Target* dep : target_deps.linked_deps()) {
if (!dep->has_dependency_output()) {
continue;
}
if (dep->IsDataOnly()) {
data_output_files.push_back(dep->dependency_output());
} else {
output_files.push_back(dep->dependency_output());
}
}
for (const Target* data_dep : target_deps.data_deps()) {
if (data_dep->has_dependency_output())
data_output_files.push_back(data_dep->dependency_output());
}
WriteStampOrPhonyForTarget(output_files, data_output_files);
}
void NinjaGeneratedFileTargetWriter::GenerateFile() {
Err err;
std::vector<SourceFile> outputs_as_sources;
target_->action_values().GetOutputsAsSourceFiles(target_,
&outputs_as_sources);
CHECK(outputs_as_sources.size() == 1);
base::FilePath output =
settings_->build_settings()->GetFullPath(outputs_as_sources[0]);
ScopedTrace trace(TraceItem::TRACE_FILE_WRITE_GENERATED,
outputs_as_sources[0].value());
trace.SetToolchain(target_->settings()->toolchain_label());
// If this is a metadata target, populate the write value with the appropriate
// data.
Value contents;
if (target_->contents().type() == Value::NONE) {
// Origin is set to the outputs location, so that errors with this value
// get flagged on the right target.
CHECK(target_->action_values().outputs().list().size() == 1U);
contents = Value(target_->action_values().outputs().list()[0].origin(),
Value::LIST);
TargetSet targets_walked;
ScopedTrace metadata_walk_trace(TraceItem::TRACE_WALK_METADATA,
target_->label());
trace.SetToolchain(target_->settings()->toolchain_label());
if (!target_->GetMetadata(target_->data_keys(), target_->walk_keys(),
target_->rebase(), /*deps_only = */ true,
&contents.list_value(), &targets_walked, &err)) {
g_scheduler->FailWithError(err);
return;
}
} else {
contents = target_->contents();
}
// Compute output.
StringOutputBuffer storage;
std::ostream out(&storage);
ConvertValueToOutput(settings_, contents, target_->output_conversion(), out,
&err);
if (err.has_error()) {
g_scheduler->FailWithError(err);
return;
}
storage.WriteToFileIfChanged(output, &err);
if (err.has_error()) {
g_scheduler->FailWithError(err);
return;
}
}