tools/gn/command_gen.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 "base/atomicops.h"
   6 #include "base/bind.h"
   7 #include "base/command_line.h"
   8 #include "base/strings/string_number_conversions.h"
   9 #include "base/timer/elapsed_timer.h"
  10 #include "tools/gn/build_settings.h"
  11 #include "tools/gn/commands.h"
  12 #include "tools/gn/ninja_target_writer.h"
  13 #include "tools/gn/ninja_writer.h"
  14 #include "tools/gn/scheduler.h"
  15 #include "tools/gn/setup.h"
  16 #include "tools/gn/standard_out.h"
  17 #include "tools/gn/switches.h"
  18 #include "tools/gn/target.h"
  19
  20 namespace commands {
  21
  22 namespace {
  23
  24 const char kSwitchCheck[] = "check";
  25
  26 // Called on worker thread to write the ninja file.
  27 void BackgroundDoWrite(const Target* target) {
  28   NinjaTargetWriter::RunAndWriteFile(target);
  29   g_scheduler->DecrementWorkCount();
  30 }
  31
  32 // Called on the main thread.
  33 void ItemResolvedCallback(base::subtle::Atomic32* write_counter,
  34                           scoped_refptr<Builder> builder,
  35                           const BuilderRecord* record) {
  36   base::subtle::NoBarrier_AtomicIncrement(write_counter, 1);
  37
  38   const Item* item = record->item();
  39   const Target* target = item->AsTarget();
  40   if (target) {
  41     g_scheduler->IncrementWorkCount();
  42     g_scheduler->ScheduleWork(base::Bind(&BackgroundDoWrite, target));
  43   }
  44 }
  45
  46 }  // namespace
  47
  48 const char kGen[] = "gen";
  49 const char kGen_HelpShort[] =
  50     "gen: Generate ninja files.";
  51 const char kGen_Help[] =
  52     "gn gen: Generate ninja files.\n"
  53     "\n"
  54     "  gn gen <output_directory>\n"
  55     "\n"
  56     "  Generates ninja files from the current tree and puts them in the given\n"
  57     "  output directory.\n"
  58     "\n"
  59     "  The output directory can be a source-repo-absolute path name such as:\n"
  60     "      //out/foo\n"
  61     "  Or it can be a directory relative to the current directory such as:\n"
  62     "      out/foo\n"
  63     "\n"
  64     "  See \"gn help\" for the common command-line switches.\n";
  65
  66 int RunGen(const std::vector<std::string>& args) {
  67   base::ElapsedTimer timer;
  68
  69   if (args.size() != 1) {
  70     Err(Location(), "Need exactly one build directory to generate.",
  71         "I expected something more like \"gn gen out/foo\"\n"
  72         "You can also see \"gn help gen\".").PrintToStdout();
  73     return 1;
  74   }
  75
  76   // Deliberately leaked to avoid expensive process teardown.
  77   Setup* setup = new Setup();
  78   if (!setup->DoSetup(args[0], true))
  79     return 1;
  80
  81   if (CommandLine::ForCurrentProcess()->HasSwitch(kSwitchCheck))
  82     setup->set_check_public_headers(true);
  83
  84   // Cause the load to also generate the ninja files for each target. We wrap
  85   // the writing to maintain a counter.
  86   base::subtle::Atomic32 write_counter = 0;
  87   setup->builder()->set_resolved_callback(
  88       base::Bind(&ItemResolvedCallback, &write_counter,
  89                  scoped_refptr<Builder>(setup->builder())));
  90
  91   // Do the actual load. This will also write out the target ninja files.
  92   if (!setup->Run())
  93     return 1;
  94
  95   Err err;
  96   // Write the root ninja files.
  97   if (!NinjaWriter::RunAndWriteFiles(&setup->build_settings(),
  98                                      setup->builder(),
  99                                      &err)) {
 100     err.PrintToStdout();
 101     return 1;
 102   }
 103
 104   base::TimeDelta elapsed_time = timer.Elapsed();
 105
 106   if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kQuiet)) {
 107     OutputString("Done. ", DECORATION_GREEN);
 108
 109     std::string stats = "Wrote " +
 110         base::IntToString(static_cast<int>(write_counter)) +
 111         " targets from " +
 112         base::IntToString(
 113             setup->scheduler().input_file_manager()->GetInputFileCount()) +
 114         " files in " +
 115         base::Int64ToString(elapsed_time.InMilliseconds()) + "ms\n";
 116     OutputString(stats);
 117   }
 118
 119   return 0;
 120 }
 121
 122 }  // namespace commands