chrome/renderer/benchmarking_extension.cc

   1 // Copyright (c) 2011 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 "chrome/renderer/benchmarking_extension.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/time/time.h"
   9 #include "content/public/common/content_switches.h"
  10 #include "content/public/renderer/render_thread.h"
  11 #include "v8/include/v8.h"
  12
  13 const char kBenchmarkingExtensionName[] = "v8/Benchmarking";
  14
  15 namespace extensions_v8 {
  16
  17 class BenchmarkingWrapper : public v8::Extension {
  18  public:
  19   BenchmarkingWrapper() :
  20       v8::Extension(kBenchmarkingExtensionName,
  21         "if (typeof(chrome) == 'undefined') {"
  22         "  chrome = {};"
  23         "};"
  24         "if (typeof(chrome.benchmarking) == 'undefined') {"
  25         "  chrome.benchmarking = {};"
  26         "};"
  27         "chrome.benchmarking.isSingleProcess = function() {"
  28         "  native function IsSingleProcess();"
  29         "  return IsSingleProcess();"
  30         "};"
  31         "chrome.Interval = function() {"
  32         "  var start_ = 0;"
  33         "  var stop_ = 0;"
  34         "  native function HiResTime();"
  35         "  this.start = function() {"
  36         "    stop_ = 0;"
  37         "    start_ = HiResTime();"
  38         "  };"
  39         "  this.stop = function() {"
  40         "    stop_ = HiResTime();"
  41         "    if (start_ == 0)"
  42         "      stop_ = 0;"
  43         "  };"
  44         "  this.microseconds = function() {"
  45         "    var stop = stop_;"
  46         "    if (stop == 0 && start_ != 0)"
  47         "      stop = HiResTime();"
  48         "    return Math.ceil(stop - start_);"
  49         "  };"
  50         "}"
  51         ) {}
  52
  53   v8::Local<v8::FunctionTemplate> GetNativeFunctionTemplate(
  54       v8::Isolate* isolate,
  55       v8::Local<v8::String> name) override {
  56     if (name->Equals(v8::String::NewFromUtf8(isolate, "IsSingleProcess"))) {
  57       return v8::FunctionTemplate::New(isolate, IsSingleProcess);
  58     } else if (name->Equals(v8::String::NewFromUtf8(isolate, "HiResTime"))) {
  59       return v8::FunctionTemplate::New(isolate, HiResTime);
  60     }
  61
  62     return v8::Local<v8::FunctionTemplate>();
  63   }
  64
  65   static void IsSingleProcess(const v8::FunctionCallbackInfo<v8::Value>& args) {
  66     args.GetReturnValue().Set(base::CommandLine::ForCurrentProcess()->HasSwitch(
  67         switches::kSingleProcess));
  68   }
  69
  70   static void HiResTime(const v8::FunctionCallbackInfo<v8::Value>& args) {
  71     args.GetReturnValue().Set(
  72         static_cast<double>(base::TimeTicks::Now().ToInternalValue()));
  73   }
  74 };
  75
  76 v8::Extension* BenchmarkingExtension::Get() {
  77   return new BenchmarkingWrapper();
  78 }
  79
  80 }  // namespace extensions_v8