text: // Copyright 2014 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  //       copyright notice, this list of conditions and the following
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include <assert.h>
  #include <string.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string>
  #include <vector>
  #include "v8.h"
  
  #include "api.h"
  #include "compiler.h"
  #include "scanner-character-streams.h"
  #include "shell-utils.h"
  #include "parser.h"
  #include "preparse-data-format.h"
  #include "preparse-data.h"
  #include "preparser.h"
  
  using namespace v8::internal;
  
  std::pair<TimeDelta, TimeDelta> RunBaselineParser(
      const char* fname, Encoding encoding, int repeat, v8::Isolate* isolate,
      v8::Handle<v8::Context> context) {
    int length = 0;
    const byte* source = ReadFileAndRepeat(fname, &length, repeat);
    v8::Handle<v8::String> source_handle;
    switch (encoding) {
      case UTF8: {
        source_handle = v8::String::NewFromUtf8(
            isolate, reinterpret_cast<const char*>(source));
        break;
      }
      case UTF16: {
        source_handle = v8::String::NewFromTwoByte(
            isolate, reinterpret_cast<const uint16_t*>(source),
            v8::String::kNormalString, length / 2);
        break;
      }
      case LATIN1: {
        source_handle = v8::String::NewFromOneByte(isolate, source);
        break;
      }
    }
    TimeDelta parse_time1, parse_time2;
    Handle<Script> script = Isolate::Current()->factory()->NewScript(
        v8::Utils::OpenHandle(*source_handle));
    i::ScriptData* cached_data_impl = NULL;
    // First round of parsing (produce data to cache).
    {
      CompilationInfoWithZone info(script);
      info.MarkAsGlobal();
      info.SetCachedData(&cached_data_impl, i::PRODUCE_CACHED_DATA);
      ElapsedTimer timer;
      timer.Start();
      // Allow lazy parsing; otherwise we won't produce cached data.
      bool success = Parser::Parse(&info, true);
      parse_time1 = timer.Elapsed();
      if (!success) {
        fprintf(stderr, "Parsing failed\n");
        return std::make_pair(TimeDelta(), TimeDelta());
      }
    }
    // Second round of parsing (consume cached data).
    {
      CompilationInfoWithZone info(script);
      info.MarkAsGlobal();
      info.SetCachedData(&cached_data_impl, i::CONSUME_CACHED_DATA);
      ElapsedTimer timer;
      timer.Start();
      // Allow lazy parsing; otherwise cached data won't help.
      bool success = Parser::Parse(&info, true);
      parse_time2 = timer.Elapsed();
      if (!success) {
        fprintf(stderr, "Parsing failed\n");
        return std::make_pair(TimeDelta(), TimeDelta());
      }
    }
    return std::make_pair(parse_time1, parse_time2);
  }
  
  
  int main(int argc, char* argv[]) {
    v8::V8::InitializeICU();
    v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
    Encoding encoding = LATIN1;
    std::vector<std::string> fnames;
    std::string benchmark;
    int repeat = 1;
    for (int i = 0; i < argc; ++i) {
      if (strcmp(argv[i], "--latin1") == 0) {
        encoding = LATIN1;
      } else if (strcmp(argv[i], "--utf8") == 0) {
        encoding = UTF8;
      } else if (strcmp(argv[i], "--utf16") == 0) {
        encoding = UTF16;
      } else if (strncmp(argv[i], "--benchmark=", 12) == 0) {
        benchmark = std::string(argv[i]).substr(12);
      } else if (strncmp(argv[i], "--repeat=", 9) == 0) {
        std::string repeat_str = std::string(argv[i]).substr(9);
        repeat = atoi(repeat_str.c_str());
      } else if (i > 0 && argv[i][0] != '-') {
        fnames.push_back(std::string(argv[i]));
      }
    }
    v8::Isolate* isolate = v8::Isolate::GetCurrent();
    {
      v8::HandleScope handle_scope(isolate);
      v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New(isolate);
      v8::Local<v8::Context> context = v8::Context::New(isolate, NULL, global);
      ASSERT(!context.IsEmpty());
      {
        v8::Context::Scope scope(context);
        double first_parse_total = 0;
        double second_parse_total = 0;
        for (size_t i = 0; i < fnames.size(); i++) {
          std::pair<TimeDelta, TimeDelta> time = RunBaselineParser(
              fnames[i].c_str(), encoding, repeat, isolate, context);
          first_parse_total += time.first.InMillisecondsF();
          second_parse_total += time.second.InMillisecondsF();
        }
        if (benchmark.empty()) benchmark = "Baseline";
        printf("%s(FirstParseRunTime): %.f ms\n", benchmark.c_str(),
               first_parse_total);
        printf("%s(SecondParseRunTime): %.f ms\n", benchmark.c_str(),
               second_parse_total);
      }
    }
    v8::V8::Dispose();
    return 0;
  }
  