tools/gn/ninja_target_writer.cc

   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_target_writer.h"
   6
   7 #include <fstream>
   8 #include <sstream>
   9
  10 #include "base/file_util.h"
  11 #include "tools/gn/err.h"
  12 #include "tools/gn/file_template.h"
  13 #include "tools/gn/ninja_action_target_writer.h"
  14 #include "tools/gn/ninja_binary_target_writer.h"
  15 #include "tools/gn/ninja_copy_target_writer.h"
  16 #include "tools/gn/ninja_group_target_writer.h"
  17 #include "tools/gn/scheduler.h"
  18 #include "tools/gn/string_utils.h"
  19 #include "tools/gn/target.h"
  20 #include "tools/gn/trace.h"
  21
  22 NinjaTargetWriter::NinjaTargetWriter(const Target* target,
  23                                      const Toolchain* toolchain,
  24                                      std::ostream& out)
  25     : settings_(target->settings()),
  26       target_(target),
  27       toolchain_(toolchain),
  28       out_(out),
  29       path_output_(settings_->build_settings()->build_dir(),
  30                    ESCAPE_NINJA,
  31                    false),
  32       helper_(settings_->build_settings()) {
  33 }
  34
  35 NinjaTargetWriter::~NinjaTargetWriter() {
  36 }
  37
  38 // static
  39 void NinjaTargetWriter::RunAndWriteFile(const Target* target,
  40                                         const Toolchain* toolchain) {
  41   const Settings* settings = target->settings();
  42   NinjaHelper helper(settings->build_settings());
  43
  44   ScopedTrace trace(TraceItem::TRACE_FILE_WRITE,
  45                     target->label().GetUserVisibleName(false));
  46   trace.SetToolchain(settings->toolchain_label());
  47
  48   base::FilePath ninja_file(settings->build_settings()->GetFullPath(
  49       helper.GetNinjaFileForTarget(target).GetSourceFile(
  50           settings->build_settings())));
  51
  52   if (g_scheduler->verbose_logging())
  53     g_scheduler->Log("Writing", FilePathToUTF8(ninja_file));
  54
  55   base::CreateDirectory(ninja_file.DirName());
  56
  57   // It's rediculously faster to write to a string and then write that to
  58   // disk in one operation than to use an fstream here.
  59   std::stringstream file;
  60
  61   // Call out to the correct sub-type of writer.
  62   if (target->output_type() == Target::COPY_FILES) {
  63     NinjaCopyTargetWriter writer(target, toolchain, file);
  64     writer.Run();
  65   } else if (target->output_type() == Target::ACTION ||
  66              target->output_type() == Target::ACTION_FOREACH) {
  67     NinjaActionTargetWriter writer(target, toolchain, file);
  68     writer.Run();
  69   } else if (target->output_type() == Target::GROUP) {
  70     NinjaGroupTargetWriter writer(target, toolchain, file);
  71     writer.Run();
  72   } else if (target->output_type() == Target::EXECUTABLE ||
  73              target->output_type() == Target::STATIC_LIBRARY ||
  74              target->output_type() == Target::SHARED_LIBRARY ||
  75              target->output_type() == Target::SOURCE_SET) {
  76     NinjaBinaryTargetWriter writer(target, toolchain, file);
  77     writer.Run();
  78   } else {
  79     CHECK(0);
  80   }
  81
  82   std::string contents = file.str();
  83   base::WriteFile(ninja_file, contents.c_str(),
  84                   static_cast<int>(contents.size()));
  85 }
  86
  87 std::string NinjaTargetWriter::GetSourcesImplicitDeps() const {
  88   std::ostringstream ret;
  89   ret << " |";
  90
  91   // Input files are order-only deps.
  92   const Target::FileList& prereqs = target_->source_prereqs();
  93   bool has_files = !prereqs.empty();
  94   for (size_t i = 0; i < prereqs.size(); i++) {
  95     ret << " ";
  96     path_output_.WriteFile(ret, prereqs[i]);
  97   }
  98
  99   // Add on any direct deps marked as "hard".
 100   const LabelTargetVector& deps = target_->deps();
 101   for (size_t i = 0; i < deps.size(); i++) {
 102     if (deps[i].ptr->hard_dep()) {
 103       has_files = true;
 104       ret << " ";
 105       path_output_.WriteFile(ret, helper_.GetTargetOutputFile(deps[i].ptr));
 106     }
 107   }
 108
 109   if (has_files)
 110     return ret.str();
 111   return std::string();  // No files added.
 112 }
 113
 114 FileTemplate NinjaTargetWriter::GetOutputTemplate() const {
 115   const Target::FileList& outputs = target_->action_values().outputs();
 116   std::vector<std::string> output_template_args;
 117   for (size_t i = 0; i < outputs.size(); i++) {
 118     // All outputs should be in the output dir.
 119     output_template_args.push_back(
 120         RemovePrefix(outputs[i].value(),
 121                      settings_->build_settings()->build_dir().value()));
 122   }
 123   return FileTemplate(output_template_args);
 124 }