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// Copyright (c) 2013 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/ninja_build_writer.h"
#include <fstream>
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/process/process_handle.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "tools/gn/build_settings.h"
#include "tools/gn/escape.h"
#include "tools/gn/filesystem_utils.h"
#include "tools/gn/input_file_manager.h"
#include "tools/gn/scheduler.h"
#include "tools/gn/target.h"
#include "tools/gn/trace.h"
#if defined(OS_WIN)
#include <windows.h>
#endif
namespace {
std::string GetSelfInvocationCommand(const BuildSettings* build_settings) {
#if defined(OS_WIN)
wchar_t module[MAX_PATH];
GetModuleFileName(NULL, module, MAX_PATH);
//result = "\"" + base::WideToUTF8(module) + "\"";
base::FilePath executable(module);
#elif defined(OS_MACOSX)
// FIXME(brettw) write this on Mac!
base::FilePath executable("../Debug/gn");
#else
base::FilePath executable =
base::GetProcessExecutablePath(base::GetCurrentProcessHandle());
#endif
/*
// Append the root path.
CommandLine* cmdline = CommandLine::ForCurrentProcess();
result += " --root=\"" + FilePathToUTF8(settings->root_path()) + "\"";
*/
CommandLine cmdline(executable);
cmdline.AppendSwitchPath("--root", build_settings->root_path());
cmdline.AppendSwitch("-q"); // Don't write output.
EscapeOptions escape_shell;
escape_shell.mode = ESCAPE_SHELL;
#if defined(OS_WIN)
// The command line code quoting varies by platform. We have one string,
// possibly with spaces, that we want to quote. The Windows command line
// quotes again, so we don't want quoting. The Posix one doesn't.
escape_shell.inhibit_quoting = true;
#endif
const CommandLine& our_cmdline = *CommandLine::ForCurrentProcess();
const CommandLine::SwitchMap& switches = our_cmdline.GetSwitches();
for (CommandLine::SwitchMap::const_iterator i = switches.begin();
i != switches.end(); ++i) {
if (i->first != "q" && i->first != "root") {
std::string escaped_value =
EscapeString(FilePathToUTF8(i->second), escape_shell, NULL);
cmdline.AppendSwitchASCII(i->first, escaped_value);
}
}
#if defined(OS_WIN)
return base::WideToUTF8(cmdline.GetCommandLineString());
#else
return cmdline.GetCommandLineString();
#endif
}
} // namespace
NinjaBuildWriter::NinjaBuildWriter(
const BuildSettings* build_settings,
const std::vector<const Settings*>& all_settings,
const std::vector<const Target*>& default_toolchain_targets,
std::ostream& out,
std::ostream& dep_out)
: build_settings_(build_settings),
all_settings_(all_settings),
default_toolchain_targets_(default_toolchain_targets),
out_(out),
dep_out_(dep_out),
path_output_(build_settings->build_dir(), ESCAPE_NINJA, true),
helper_(build_settings) {
}
NinjaBuildWriter::~NinjaBuildWriter() {
}
void NinjaBuildWriter::Run() {
WriteNinjaRules();
WriteSubninjas();
WritePhonyAndAllRules();
}
// static
bool NinjaBuildWriter::RunAndWriteFile(
const BuildSettings* build_settings,
const std::vector<const Settings*>& all_settings,
const std::vector<const Target*>& default_toolchain_targets) {
ScopedTrace trace(TraceItem::TRACE_FILE_WRITE, "build.ninja");
base::FilePath ninja_file(build_settings->GetFullPath(
SourceFile(build_settings->build_dir().value() + "build.ninja")));
base::CreateDirectory(ninja_file.DirName());
std::ofstream file;
file.open(FilePathToUTF8(ninja_file).c_str(),
std::ios_base::out | std::ios_base::binary);
if (file.fail())
return false;
std::ofstream depfile;
depfile.open((FilePathToUTF8(ninja_file) + ".d").c_str(),
std::ios_base::out | std::ios_base::binary);
if (depfile.fail())
return false;
NinjaBuildWriter gen(build_settings, all_settings,
default_toolchain_targets, file, depfile);
gen.Run();
return true;
}
void NinjaBuildWriter::WriteNinjaRules() {
out_ << "rule gn\n";
out_ << " command = " << GetSelfInvocationCommand(build_settings_) << "\n";
out_ << " description = Regenerating ninja files\n\n";
// This rule will regenerate the ninja files when any input file has changed.
out_ << "build build.ninja: gn\n"
<< " depfile = build.ninja.d\n";
// Provide a way to force regenerating ninja files if the user is suspicious
// something is out-of-date. This will be "ninja refresh".
out_ << "\nbuild refresh: gn\n";
// Provide a way to see what flags are associated with this build:
// This will be "ninja show".
const CommandLine& our_cmdline = *CommandLine::ForCurrentProcess();
std::string args = our_cmdline.GetSwitchValueASCII("args");
out_ << "rule echo\n";
out_ << " command = echo $text\n";
out_ << " description = ECHO $desc\n";
out_ << "build show: echo\n";
out_ << " desc = build arguments:\n";
out_ << " text = "
<< (args.empty() ? std::string("No build args, using defaults.") : args)
<< "\n";
// Input build files. These go in the ".d" file. If we write them as
// dependencies in the .ninja file itself, ninja will expect the files to
// exist and will error if they don't. When files are listed in a depfile,
// missing files are ignored.
dep_out_ << "build.ninja:";
std::vector<base::FilePath> input_files;
g_scheduler->input_file_manager()->GetAllPhysicalInputFileNames(&input_files);
for (size_t i = 0; i < input_files.size(); i++)
dep_out_ << " " << FilePathToUTF8(input_files[i]);
// Other files read by the build.
std::vector<base::FilePath> other_files = g_scheduler->GetGenDependencies();
for (size_t i = 0; i < other_files.size(); i++)
dep_out_ << " " << FilePathToUTF8(other_files[i]);
out_ << std::endl;
}
void NinjaBuildWriter::WriteSubninjas() {
for (size_t i = 0; i < all_settings_.size(); i++) {
out_ << "subninja ";
path_output_.WriteFile(out_,
helper_.GetNinjaFileForToolchain(all_settings_[i]));
out_ << std::endl;
}
out_ << std::endl;
}
void NinjaBuildWriter::WritePhonyAndAllRules() {
std::string all_rules;
// Write phony rules for the default toolchain (don't do other toolchains or
// we'll get naming conflicts).
for (size_t i = 0; i < default_toolchain_targets_.size(); i++) {
const Target* target = default_toolchain_targets_[i];
OutputFile target_file = helper_.GetTargetOutputFile(target);
if (target_file.value() != target->label().name()) {
out_ << "build " << target->label().name() << ": phony ";
path_output_.WriteFile(out_, target_file);
out_ << std::endl;
}
if (!all_rules.empty())
all_rules.append(" $\n ");
all_rules.append(target_file.value());
}
if (!all_rules.empty()) {
out_ << "\nbuild all: phony " << all_rules << std::endl;
out_ << "default all" << std::endl;
}
}
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