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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/renderer/benchmarking_extension.h"
#include "base/command_line.h"
#include "base/metrics/stats_table.h"
#include "base/time/time.h"
#include "content/public/common/content_switches.h"
#include "content/public/renderer/render_thread.h"
#include "v8/include/v8.h"
const char kBenchmarkingExtensionName[] = "v8/Benchmarking";
namespace extensions_v8 {
class BenchmarkingWrapper : public v8::Extension {
public:
BenchmarkingWrapper() :
v8::Extension(kBenchmarkingExtensionName,
"if (typeof(chrome) == 'undefined') {"
" chrome = {};"
"};"
"if (typeof(chrome.benchmarking) == 'undefined') {"
" chrome.benchmarking = {};"
"};"
"chrome.benchmarking.counter = function(name) {"
" native function GetCounter();"
" return GetCounter(name);"
"};"
"chrome.benchmarking.counterForRenderer = function(name) {"
" native function GetCounterForRenderer();"
" return GetCounterForRenderer(name);"
"};"
"chrome.benchmarking.isSingleProcess = function() {"
" native function IsSingleProcess();"
" return IsSingleProcess();"
"};"
"chrome.Interval = function() {"
" var start_ = 0;"
" var stop_ = 0;"
" native function HiResTime();"
" this.start = function() {"
" stop_ = 0;"
" start_ = HiResTime();"
" };"
" this.stop = function() {"
" stop_ = HiResTime();"
" if (start_ == 0)"
" stop_ = 0;"
" };"
" this.microseconds = function() {"
" var stop = stop_;"
" if (stop == 0 && start_ != 0)"
" stop = HiResTime();"
" return Math.ceil(stop - start_);"
" };"
"}"
) {}
virtual v8::Handle<v8::FunctionTemplate> GetNativeFunctionTemplate(
v8::Isolate* isolate,
v8::Handle<v8::String> name) OVERRIDE {
if (name->Equals(v8::String::NewFromUtf8(isolate, "GetCounter"))) {
return v8::FunctionTemplate::New(isolate, GetCounter);
} else if (name->Equals(
v8::String::NewFromUtf8(isolate, "GetCounterForRenderer"))) {
return v8::FunctionTemplate::New(isolate, GetCounterForRenderer);
} else if (name->Equals(
v8::String::NewFromUtf8(isolate, "IsSingleProcess"))) {
return v8::FunctionTemplate::New(isolate, IsSingleProcess);
} else if (name->Equals(v8::String::NewFromUtf8(isolate, "HiResTime"))) {
return v8::FunctionTemplate::New(isolate, HiResTime);
}
return v8::Handle<v8::FunctionTemplate>();
}
/*
* Extract the counter name from arguments.
*/
static void ExtractCounterName(
const v8::FunctionCallbackInfo<v8::Value>& args,
char* name,
size_t capacity) {
name[0] = 'c';
name[1] = ':';
args[0]->ToString()->WriteUtf8(&name[2], capacity - 3);
}
static void GetCounter(const v8::FunctionCallbackInfo<v8::Value>& args) {
if (!args.Length() || !args[0]->IsString() || !base::StatsTable::current())
return;
char name[256];
ExtractCounterName(args, name, sizeof(name));
int counter = base::StatsTable::current()->GetCounterValue(name);
args.GetReturnValue().Set(static_cast<int32_t>(counter));
}
static void GetCounterForRenderer(
const v8::FunctionCallbackInfo<v8::Value>& args) {
if (!args.Length() || !args[0]->IsString() || !base::StatsTable::current())
return;
char name[256];
ExtractCounterName(args, name, sizeof(name));
int counter = base::StatsTable::current()->GetCounterValue(
name,
base::GetCurrentProcId());
args.GetReturnValue().Set(static_cast<int32_t>(counter));
}
static void IsSingleProcess(const v8::FunctionCallbackInfo<v8::Value>& args) {
args.GetReturnValue().Set(
CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess));
}
static void HiResTime(const v8::FunctionCallbackInfo<v8::Value>& args) {
args.GetReturnValue().Set(
static_cast<double>(base::TimeTicks::HighResNow().ToInternalValue()));
}
};
v8::Extension* BenchmarkingExtension::Get() {
return new BenchmarkingWrapper();
}
} // namespace extensions_v8
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