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/files/file_util.h"
  11 #include "base/strings/string_util.h"
  12 #include "tools/gn/err.h"
  13 #include "tools/gn/filesystem_utils.h"
  14 #include "tools/gn/ninja_action_target_writer.h"
  15 #include "tools/gn/ninja_binary_target_writer.h"
  16 #include "tools/gn/ninja_copy_target_writer.h"
  17 #include "tools/gn/ninja_group_target_writer.h"
  18 #include "tools/gn/ninja_utils.h"
  19 #include "tools/gn/output_file.h"
  20 #include "tools/gn/scheduler.h"
  21 #include "tools/gn/string_utils.h"
  22 #include "tools/gn/substitution_writer.h"
  23 #include "tools/gn/target.h"
  24 #include "tools/gn/trace.h"
  25
  26 NinjaTargetWriter::NinjaTargetWriter(const Target* target,
  27                                      std::ostream& out)
  28     : settings_(target->settings()),
  29       target_(target),
  30       out_(out),
  31       path_output_(settings_->build_settings()->build_dir(),
  32                    settings_->build_settings()->root_path_utf8(),
  33                    ESCAPE_NINJA) {
  34 }
  35
  36 NinjaTargetWriter::~NinjaTargetWriter() {
  37 }
  38
  39 // static
  40 void NinjaTargetWriter::RunAndWriteFile(const Target* target) {
  41   const Settings* settings = target->settings();
  42
  43   ScopedTrace trace(TraceItem::TRACE_FILE_WRITE,
  44                     target->label().GetUserVisibleName(false));
  45   trace.SetToolchain(settings->toolchain_label());
  46
  47   base::FilePath ninja_file(settings->build_settings()->GetFullPath(
  48       GetNinjaFileForTarget(target)));
  49
  50   if (g_scheduler->verbose_logging())
  51     g_scheduler->Log("Writing", FilePathToUTF8(ninja_file));
  52
  53   base::CreateDirectory(ninja_file.DirName());
  54
  55   // It's rediculously faster to write to a string and then write that to
  56   // disk in one operation than to use an fstream here.
  57   std::stringstream file;
  58
  59   // Call out to the correct sub-type of writer.
  60   if (target->output_type() == Target::COPY_FILES) {
  61     NinjaCopyTargetWriter writer(target, file);
  62     writer.Run();
  63   } else if (target->output_type() == Target::ACTION ||
  64              target->output_type() == Target::ACTION_FOREACH) {
  65     NinjaActionTargetWriter writer(target, file);
  66     writer.Run();
  67   } else if (target->output_type() == Target::GROUP) {
  68     NinjaGroupTargetWriter writer(target, file);
  69     writer.Run();
  70   } else if (target->output_type() == Target::EXECUTABLE ||
  71              target->output_type() == Target::STATIC_LIBRARY ||
  72              target->output_type() == Target::SHARED_LIBRARY ||
  73              target->output_type() == Target::SOURCE_SET) {
  74     NinjaBinaryTargetWriter writer(target, file);
  75     writer.Run();
  76   } else {
  77     CHECK(0);
  78   }
  79
  80   std::string contents = file.str();
  81   base::WriteFile(ninja_file, contents.c_str(),
  82                   static_cast<int>(contents.size()));
  83 }
  84
  85 void NinjaTargetWriter::WriteSharedVars(const SubstitutionBits& bits) {
  86   bool written_anything = false;
  87
  88   // Target label.
  89   if (bits.used[SUBSTITUTION_LABEL]) {
  90     out_ << kSubstitutionNinjaNames[SUBSTITUTION_LABEL] << " = "
  91          << SubstitutionWriter::GetTargetSubstitution(
  92                 target_, SUBSTITUTION_LABEL)
  93          << std::endl;
  94     written_anything = true;
  95   }
  96
  97   // Root gen dir.
  98   if (bits.used[SUBSTITUTION_ROOT_GEN_DIR]) {
  99     out_ << kSubstitutionNinjaNames[SUBSTITUTION_ROOT_GEN_DIR] << " = "
 100          << SubstitutionWriter::GetTargetSubstitution(
 101                 target_, SUBSTITUTION_ROOT_GEN_DIR)
 102          << std::endl;
 103     written_anything = true;
 104   }
 105
 106   // Root out dir.
 107   if (bits.used[SUBSTITUTION_ROOT_OUT_DIR]) {
 108     out_ << kSubstitutionNinjaNames[SUBSTITUTION_ROOT_OUT_DIR] << " = "
 109          << SubstitutionWriter::GetTargetSubstitution(
 110                 target_, SUBSTITUTION_ROOT_OUT_DIR)
 111          << std::endl;
 112     written_anything = true;
 113   }
 114
 115   // Target gen dir.
 116   if (bits.used[SUBSTITUTION_TARGET_GEN_DIR]) {
 117     out_ << kSubstitutionNinjaNames[SUBSTITUTION_TARGET_GEN_DIR] << " = "
 118          << SubstitutionWriter::GetTargetSubstitution(
 119                 target_, SUBSTITUTION_TARGET_GEN_DIR)
 120          << std::endl;
 121     written_anything = true;
 122   }
 123
 124   // Target out dir.
 125   if (bits.used[SUBSTITUTION_TARGET_OUT_DIR]) {
 126     out_ << kSubstitutionNinjaNames[SUBSTITUTION_TARGET_OUT_DIR] << " = "
 127          << SubstitutionWriter::GetTargetSubstitution(
 128                 target_, SUBSTITUTION_TARGET_OUT_DIR)
 129          << std::endl;
 130     written_anything = true;
 131   }
 132
 133   // Target output name.
 134   if (bits.used[SUBSTITUTION_TARGET_OUTPUT_NAME]) {
 135     out_ << kSubstitutionNinjaNames[SUBSTITUTION_TARGET_OUTPUT_NAME] << " = "
 136          << SubstitutionWriter::GetTargetSubstitution(
 137                 target_, SUBSTITUTION_TARGET_OUTPUT_NAME)
 138          << std::endl;
 139     written_anything = true;
 140   }
 141
 142   // If we wrote any vars, separate them from the rest of the file that follows
 143   // with a blank line.
 144   if (written_anything)
 145     out_ << std::endl;
 146 }
 147
 148 OutputFile NinjaTargetWriter::WriteInputDepsStampAndGetDep(
 149     const std::vector<const Target*>& extra_hard_deps) const {
 150   CHECK(target_->toolchain())
 151       << "Toolchain not set on target "
 152       << target_->label().GetUserVisibleName(true);
 153
 154   // For an action (where we run a script only once) the sources are the same
 155   // as the source prereqs.
 156   bool list_sources_as_input_deps = (target_->output_type() == Target::ACTION);
 157
 158   // Actions get implicit dependencies on the script itself.
 159   bool add_script_source_as_dep =
 160       (target_->output_type() == Target::ACTION) ||
 161       (target_->output_type() == Target::ACTION_FOREACH);
 162
 163   if (!add_script_source_as_dep &&
 164       extra_hard_deps.empty() &&
 165       target_->inputs().empty() &&
 166       target_->recursive_hard_deps().empty() &&
 167       (!list_sources_as_input_deps || target_->sources().empty()) &&
 168       target_->toolchain()->deps().empty())
 169     return OutputFile();  // No input/hard deps.
 170
 171   // One potential optimization is if there are few input dependencies (or
 172   // potentially few sources that depend on these) it's better to just write
 173   // all hard deps on each sources line than have this intermediate stamp. We
 174   // do the stamp file because duplicating all the order-only deps for each
 175   // source file can really explode the ninja file but this won't be the most
 176   // optimal thing in all cases.
 177
 178   OutputFile input_stamp_file(
 179       RebasePath(GetTargetOutputDir(target_).value(),
 180                  settings_->build_settings()->build_dir(),
 181                  settings_->build_settings()->root_path_utf8()));
 182   input_stamp_file.value().append(target_->label().name());
 183   input_stamp_file.value().append(".inputdeps.stamp");
 184
 185   out_ << "build ";
 186   path_output_.WriteFile(out_, input_stamp_file);
 187   out_ << ": "
 188        << GetNinjaRulePrefixForToolchain(settings_)
 189        << Toolchain::ToolTypeToName(Toolchain::TYPE_STAMP);
 190
 191   // Script file (if applicable).
 192   if (add_script_source_as_dep) {
 193     out_ << " ";
 194     path_output_.WriteFile(out_, target_->action_values().script());
 195   }
 196
 197   // Input files are order-only deps.
 198   const Target::FileList& prereqs = target_->inputs();
 199   for (size_t i = 0; i < prereqs.size(); i++) {
 200     out_ << " ";
 201     path_output_.WriteFile(out_, prereqs[i]);
 202   }
 203   if (list_sources_as_input_deps) {
 204     const Target::FileList& sources = target_->sources();
 205     for (size_t i = 0; i < sources.size(); i++) {
 206       out_ << " ";
 207       path_output_.WriteFile(out_, sources[i]);
 208     }
 209   }
 210
 211   // The different souces of input deps may duplicate some targets, so uniquify
 212   // them (ordering doesn't matter for this case).
 213   std::set<const Target*> unique_deps;
 214
 215   // Hard dependencies that are direct or indirect dependencies.
 216   const std::set<const Target*>& hard_deps = target_->recursive_hard_deps();
 217   for (const auto& dep : hard_deps)
 218     unique_deps.insert(dep);
 219
 220   // Extra hard dependencies passed in.
 221   unique_deps.insert(extra_hard_deps.begin(), extra_hard_deps.end());
 222
 223   // Toolchain dependencies. These must be resolved before doing anything.
 224   // This just writs all toolchain deps for simplicity. If we find that
 225   // toolchains often have more than one dependency, we could consider writing
 226   // a toolchain-specific stamp file and only include the stamp here.
 227   const LabelTargetVector& toolchain_deps = target_->toolchain()->deps();
 228   for (size_t i = 0; i < toolchain_deps.size(); i++)
 229     unique_deps.insert(toolchain_deps[i].ptr);
 230
 231   for (const auto& dep : unique_deps) {
 232     DCHECK(!dep->dependency_output_file().value().empty());
 233     out_ << " ";
 234     path_output_.WriteFile(out_, dep->dependency_output_file());
 235   }
 236
 237   out_ << "\n";
 238   return input_stamp_file;
 239 }
 240
 241 void NinjaTargetWriter::WriteStampForTarget(
 242     const std::vector<OutputFile>& files,
 243     const std::vector<OutputFile>& order_only_deps) {
 244   const OutputFile& stamp_file = target_->dependency_output_file();
 245
 246   // First validate that the target's dependency is a stamp file. Otherwise,
 247   // we shouldn't have gotten here!
 248   CHECK(EndsWith(stamp_file.value(), ".stamp", false))
 249       << "Output should end in \".stamp\" for stamp file output. Instead got: "
 250       << "\"" << stamp_file.value() << "\"";
 251
 252   out_ << "build ";
 253   path_output_.WriteFile(out_, stamp_file);
 254
 255   out_ << ": "
 256        << GetNinjaRulePrefixForToolchain(settings_)
 257        << Toolchain::ToolTypeToName(Toolchain::TYPE_STAMP);
 258   path_output_.WriteFiles(out_, files);
 259
 260   if (!order_only_deps.empty()) {
 261     out_ << " ||";
 262     path_output_.WriteFiles(out_, order_only_deps);
 263   }
 264   out_ << std::endl;
 265 }