ninja_toolchain_writer.cc revision 116680a4aac90f2aa7413d9095a592090648e557 
1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "tools/gn/ninja_toolchain_writer.h"
6
7#include <fstream>
8
9#include "base/file_util.h"
10#include "base/strings/stringize_macros.h"
11#include "tools/gn/build_settings.h"
12#include "tools/gn/settings.h"
13#include "tools/gn/target.h"
14#include "tools/gn/toolchain.h"
15#include "tools/gn/trace.h"
16
17NinjaToolchainWriter::NinjaToolchainWriter(
18    const Settings* settings,
19    const Toolchain* toolchain,
20    const std::vector<const Target*>& targets,
21    std::ostream& out)
22    : settings_(settings),
23      toolchain_(toolchain),
24      targets_(targets),
25      out_(out),
26      path_output_(settings_->build_settings()->build_dir(), ESCAPE_NINJA),
27      helper_(settings->build_settings()) {
28}
29
30NinjaToolchainWriter::~NinjaToolchainWriter() {
31}
32
33void NinjaToolchainWriter::Run() {
34  WriteRules();
35  WriteSubninjas();
36}
37
38// static
39bool NinjaToolchainWriter::RunAndWriteFile(
40    const Settings* settings,
41    const Toolchain* toolchain,
42    const std::vector<const Target*>& targets) {
43  NinjaHelper helper(settings->build_settings());
44  base::FilePath ninja_file(settings->build_settings()->GetFullPath(
45      helper.GetNinjaFileForToolchain(settings).GetSourceFile(
46          settings->build_settings())));
47  ScopedTrace trace(TraceItem::TRACE_FILE_WRITE, FilePathToUTF8(ninja_file));
48
49  base::CreateDirectory(ninja_file.DirName());
50
51  std::ofstream file;
52  file.open(FilePathToUTF8(ninja_file).c_str(),
53            std::ios_base::out | std::ios_base::binary);
54  if (file.fail())
55    return false;
56
57  NinjaToolchainWriter gen(settings, toolchain, targets, file);
58  gen.Run();
59  return true;
60}
61
62void NinjaToolchainWriter::WriteRules() {
63  std::string indent("  ");
64
65  NinjaHelper helper(settings_->build_settings());
66  std::string rule_prefix = helper.GetRulePrefix(settings_);
67
68  for (int i = Toolchain::TYPE_NONE + 1; i < Toolchain::TYPE_NUMTYPES; i++) {
69    Toolchain::ToolType tool_type = static_cast<Toolchain::ToolType>(i);
70    const Toolchain::Tool& tool = toolchain_->GetTool(tool_type);
71    if (tool.command.empty())
72      continue;
73
74    out_ << "rule " << rule_prefix << Toolchain::ToolTypeToName(tool_type)
75         << std::endl;
76
77    #define WRITE_ARG(name) \
78      if (!tool.name.empty()) \
79        out_ << indent << "  " STRINGIZE(name) " = " << tool.name << std::endl;
80    WRITE_ARG(command);
81    WRITE_ARG(depfile);
82    WRITE_ARG(description);
83    WRITE_ARG(pool);
84    WRITE_ARG(restat);
85    WRITE_ARG(rspfile);
86    WRITE_ARG(rspfile_content);
87    #undef WRITE_ARG
88
89    // Deps is called "depsformat" in GN to avoid confusion with dependencies.
90    if (!tool.depsformat.empty()) \
91      out_ << indent << "  deps = " << tool.depsformat << std::endl;
92  }
93  out_ << std::endl;
94}
95
96void NinjaToolchainWriter::WriteSubninjas() {
97  // Write subninja commands for each generated target.
98  for (size_t i = 0; i < targets_.size(); i++) {
99    OutputFile ninja_file = helper_.GetNinjaFileForTarget(targets_[i]);
100    out_ << "subninja ";
101    path_output_.WriteFile(out_, ninja_file);
102    out_ << std::endl;
103  }
104  out_ << std::endl;
105}
106