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// Copyright (c) 2016 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 "tools/gn/json_project_writer.h"
#include <iostream>
#include "base/command_line.h"
#include "base/json/json_writer.h"
#include "base/memory/ptr_util.h"
#include "base/strings/string_number_conversions.h"
#include "tools/gn/builder.h"
#include "tools/gn/commands.h"
#include "tools/gn/deps_iterator.h"
#include "tools/gn/desc_builder.h"
#include "tools/gn/exec_process.h"
#include "tools/gn/filesystem_utils.h"
#include "tools/gn/settings.h"
// Structure of JSON output file
// {
// "build_settings" = {
// "root_path" : "absolute path of project root",
// "build_dir" : "build directory (project relative)",
// "default_toolchain" : "name of default toolchain"
// }
// "targets" = {
// "target x name" : { target x properties },
// "target y name" : { target y properties },
// ...
// }
// }
// See desc_builder.cc for overview of target properties
namespace {
void AddTargetDependencies(const Target* target,
std::set<const Target*>* deps) {
for (const auto& pair : target->GetDeps(Target::DEPS_LINKED)) {
if (deps->find(pair.ptr) == deps->end()) {
deps->insert(pair.ptr);
AddTargetDependencies(pair.ptr, deps);
}
}
}
// Filters targets according to filter string; Will also recursively
// add dependent targets.
bool FilterTargets(const BuildSettings* build_settings,
std::vector<const Target*>& all_targets,
std::vector<const Target*>* targets,
const std::string& dir_filter_string,
Err* err) {
if (dir_filter_string.empty()) {
*targets = all_targets;
} else {
targets->reserve(all_targets.size());
std::vector<LabelPattern> filters;
if (!commands::FilterPatternsFromString(build_settings, dir_filter_string,
&filters, err)) {
return false;
}
commands::FilterTargetsByPatterns(all_targets, filters, targets);
std::set<const Target*> target_set(targets->begin(), targets->end());
for (const auto* target : *targets)
AddTargetDependencies(target, &target_set);
targets->clear();
targets->insert(targets->end(), target_set.begin(), target_set.end());
}
// Sort the list of targets per-label to get a consistent ordering of them
// in the generated project (and thus stability of the file generated).
std::sort(targets->begin(), targets->end(),
[](const Target* a, const Target* b) {
return a->label().name() < b->label().name();
});
return true;
}
std::string RenderJSON(const BuildSettings* build_settings,
const Builder& builder,
std::vector<const Target*>& all_targets) {
Label default_toolchain_label;
auto targets = base::MakeUnique<base::DictionaryValue>();
for (const auto* target : all_targets) {
if (default_toolchain_label.is_null())
default_toolchain_label = target->settings()->default_toolchain_label();
auto description =
DescBuilder::DescriptionForTarget(target, "", false, false, false);
// Outputs need to be asked for separately.
auto outputs = DescBuilder::DescriptionForTarget(target, "source_outputs",
false, false, false);
base::DictionaryValue* outputs_value = nullptr;
if (outputs->GetDictionary("source_outputs", &outputs_value) &&
!outputs_value->empty()) {
description->MergeDictionary(outputs.get());
}
targets->SetWithoutPathExpansion(
target->label().GetUserVisibleName(default_toolchain_label),
std::move(description));
}
auto settings = base::MakeUnique<base::DictionaryValue>();
settings->SetStringWithoutPathExpansion("root_path",
build_settings->root_path_utf8());
settings->SetStringWithoutPathExpansion("build_dir",
build_settings->build_dir().value());
settings->SetStringWithoutPathExpansion(
"default_toolchain",
default_toolchain_label.GetUserVisibleName(false));
auto output = base::MakeUnique<base::DictionaryValue>();
output->SetWithoutPathExpansion("targets", std::move(targets));
output->SetWithoutPathExpansion("build_settings", std::move(settings));
std::string s;
base::JSONWriter::WriteWithOptions(
*output.get(), base::JSONWriter::OPTIONS_PRETTY_PRINT, &s);
return s;
}
bool InvokePython(const BuildSettings* build_settings,
const base::FilePath& python_script_path,
const std::string& python_script_extra_args,
const base::FilePath& output_path,
bool quiet,
Err* err) {
const base::FilePath& python_path = build_settings->python_path();
base::CommandLine cmdline(python_path);
cmdline.AppendArg("--");
cmdline.AppendArgPath(python_script_path);
cmdline.AppendArgPath(output_path);
if (!python_script_extra_args.empty()) {
cmdline.AppendArg(python_script_extra_args);
}
base::FilePath startup_dir =
build_settings->GetFullPath(build_settings->build_dir());
std::string output;
std::string stderr_output;
int exit_code = 0;
if (!internal::ExecProcess(cmdline, startup_dir, &output, &stderr_output,
&exit_code)) {
*err =
Err(Location(), "Could not execute python.",
"I was trying to execute \"" + FilePathToUTF8(python_path) + "\".");
return false;
}
if (!quiet) {
std::cout << output;
std::cerr << stderr_output;
}
if (exit_code != 0) {
*err = Err(Location(), "Python has quit with exit code " +
base::IntToString(exit_code) + ".");
return false;
}
return true;
}
} // namespace
bool JSONProjectWriter::RunAndWriteFiles(
const BuildSettings* build_settings,
const Builder& builder,
const std::string& file_name,
const std::string& exec_script,
const std::string& exec_script_extra_args,
const std::string& dir_filter_string,
bool quiet,
Err* err) {
SourceFile output_file = build_settings->build_dir().ResolveRelativeFile(
Value(nullptr, file_name), err);
if (output_file.is_null()) {
return false;
}
base::FilePath output_path = build_settings->GetFullPath(output_file);
std::vector<const Target*> all_targets = builder.GetAllResolvedTargets();
std::vector<const Target*> targets;
if (!FilterTargets(build_settings, all_targets, &targets, dir_filter_string,
err)) {
return false;
}
std::string json = RenderJSON(build_settings, builder, targets);
if (!ContentsEqual(output_path, json)) {
if (!WriteFileIfChanged(output_path, json, err)) {
return false;
}
if (!exec_script.empty()) {
SourceFile script_file;
if (exec_script[0] != '/') {
// Relative path, assume the base is in build_dir.
script_file = build_settings->build_dir().ResolveRelativeFile(
Value(nullptr, exec_script), err);
if (script_file.is_null()) {
return false;
}
} else {
script_file = SourceFile(exec_script);
}
base::FilePath script_path = build_settings->GetFullPath(script_file);
return InvokePython(build_settings, script_path, exec_script_extra_args,
output_path, quiet, err);
}
}
return true;
}
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