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// Copyright 2011 The Chromium Authors
// 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 <cstdint>
#include <string>
#include "base/command_line.h"
#include "base/process/process_handle.h"
#include "base/profiler/module_cache.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "base/trace_event/base_tracing.h"
#include "content/public/common/content_switches.h"
#include "content/public/renderer/render_thread.h"
#include "v8-local-handle.h"
#include "v8/include//v8-function.h"
#include "v8/include/v8-extension.h"
#include "v8/include/v8-isolate.h"
#include "v8/include/v8-primitive.h"
#include "v8/include/v8-template.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.isSingleProcess = function() {"
" native function IsSingleProcess();"
" return IsSingleProcess();"
"};"
"chrome.benchmarking.getRendererPid = function() {"
" native function GetRendererPid();"
" return GetRendererPid();"
"};"
"chrome.benchmarking.getRendererMainTid = function() {"
" native function GetRendererMainTid();"
" return GetRendererMainTid();"
"};"
"chrome.benchmarking.getMarkFunctions = function() {"
" native function GetMarkFunctions();"
" return GetMarkFunctions();"
"};"
"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_);"
" };"
"}") {}
v8::Local<v8::FunctionTemplate> GetNativeFunctionTemplate(
v8::Isolate* isolate,
v8::Local<v8::String> name) override {
if (name->StringEquals(GetString(isolate, "IsSingleProcess"))) {
return v8::FunctionTemplate::New(isolate, IsSingleProcess);
} else if (name->StringEquals(GetString(isolate, "HiResTime"))) {
return v8::FunctionTemplate::New(isolate, HiResTime);
} else if (name->StringEquals(GetString(isolate, "GetRendererPid"))) {
return v8::FunctionTemplate::New(isolate, GetRendererPid);
} else if (name->StringEquals(GetString(isolate, "GetRendererMainTid"))) {
return v8::FunctionTemplate::New(isolate, GetRendererMainTid);
} else if (name->StringEquals(GetString(isolate, "GetMarkFunctions"))) {
return v8::FunctionTemplate::New(isolate, GetMarkFunctions);
}
return v8::Local<v8::FunctionTemplate>();
}
static void IsSingleProcess(const v8::FunctionCallbackInfo<v8::Value>& args) {
args.GetReturnValue().Set(base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kSingleProcess));
}
static void HiResTime(const v8::FunctionCallbackInfo<v8::Value>& args) {
args.GetReturnValue().Set(
static_cast<double>(base::TimeTicks::Now().ToInternalValue()));
}
static void GetRendererPid(const v8::FunctionCallbackInfo<v8::Value>& args) {
args.GetReturnValue().Set(static_cast<int>(base::GetCurrentProcId()));
}
static void GetRendererMainTid(
const v8::FunctionCallbackInfo<v8::Value>& args) {
// The current thread ID might be an int64, however int64 values are not
// representable in JS and JSON (cf. crbug.com/40228085) since JS numbers
// are float64. Since thread IDs are likely to be allocated sequentially,
// truncation of the high bits is preferable to loss of precision in the low
// bits, as threads are more likely to differ in their low bit values, so we
// truncate the value to int32. Since this is only used for dumping
// benchmark state, the loss of information is not catastrophic and won't
// happen in normal browser execution.
args.GetReturnValue().Set(
base::PlatformThread::CurrentId().truncate_to_int32_for_display_only());
}
private:
static void StartMark(const v8::FunctionCallbackInfo<v8::Value>& info) {
TRACE_EVENT_INSTANT("benchmark", "Benchmarking::StartMark");
}
static void StopMark(const v8::FunctionCallbackInfo<v8::Value>& info) {
TRACE_EVENT_INSTANT("benchmark", "Benchmarking::StopMark");
}
static v8::Local<v8::String> GetString(v8::Isolate* isolate,
const std::string& string) {
return v8::String::NewFromUtf8(isolate, string.data(),
v8::NewStringType::kInternalized,
string.length())
.ToLocalChecked();
}
static v8::Local<v8::Object> GetMark(
const v8::FunctionCallbackInfo<v8::Value>& info,
base::ModuleCache& cache,
void (*func)(const v8::FunctionCallbackInfo<v8::Value>&)) {
auto* isolate = info.GetIsolate();
auto context = isolate->GetCurrentContext();
uintptr_t vaddr = 0;
std::string module_id;
std::string module_name;
uintptr_t module_base_addr = 0;
uintptr_t addr = reinterpret_cast<intptr_t>(func);
if (auto* module = cache.GetModuleForAddress(addr); module) {
module_id = module->GetId();
module_name = module->GetDebugBasename().AsUTF8Unsafe();
vaddr = reinterpret_cast<intptr_t>(func) - module->GetBaseAddress();
module_base_addr = module->GetBaseAddress();
}
v8::Local<v8::Object> result = v8::Object::New(isolate);
result
->Set(context, GetString(isolate, "module_id"),
GetString(isolate, module_id))
.Check();
result
->Set(context, GetString(isolate, "module_basename"),
GetString(isolate, module_name))
.Check();
result
->Set(context, GetString(isolate, "module_base_address"),
v8::BigInt::New(isolate, module_base_addr))
.Check();
result
->Set(context, GetString(isolate, "vaddr"),
v8::BigInt::New(isolate, vaddr))
.Check();
result
->Set(context, GetString(isolate, "function"),
v8::FunctionTemplate::New(isolate, func)
->GetFunction(context)
.ToLocalChecked())
.Check();
return result;
}
static void GetMarkFunctions(
const v8::FunctionCallbackInfo<v8::Value>& info) {
base::ModuleCache cache;
auto* isolate = info.GetIsolate();
auto context = isolate->GetCurrentContext();
v8::Local<v8::Object> result = v8::Object::New(isolate);
result
->Set(context, GetString(isolate, "start"),
GetMark(info, cache, StartMark))
.Check();
result
->Set(context, GetString(isolate, "stop"),
GetMark(info, cache, StopMark))
.Check();
info.GetReturnValue().Set(result);
}
};
std::unique_ptr<v8::Extension> BenchmarkingExtension::Get() {
return std::make_unique<BenchmarkingWrapper>();
}
} // namespace extensions_v8
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