Introduce v8::CpuProfiler::New and v8::CpuProfiler::Dispose API.

test/cctest/profiler-extension.cc

 // Copyright 2013 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
@@ skipping 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 //
 // Tests of profiles generator and utilities.
 
 #include "test/cctest/profiler-extension.h"
 #include "test/cctest/cctest.h"
 
 namespace v8 {
 namespace internal {
 
-v8::CpuProfile* ProfilerExtension::last_profile = NULL;
+ProfilerExtension::Scope::Scope(v8::Isolate* isolate) {
+  DCHECK(!profiler_);
+  profiler_ = v8::CpuProfiler::New(isolate);
+}
+
+ProfilerExtension::Scope::~Scope() {
+  profiler_->Dispose();
+  profiler_ = nullptr;
+}
+
+v8::CpuProfiler* ProfilerExtension::Scope::profiler_ = nullptr;
+v8::CpuProfile* ProfilerExtension::last_profile = nullptr;
 const char* ProfilerExtension::kSource =
     "native function startProfiling();"
     "native function stopProfiling();"
     "native function collectSample();";
 
 v8::Local<v8::FunctionTemplate> ProfilerExtension::GetNativeFunctionTemplate(
     v8::Isolate* isolate, v8::Local<v8::String> name) {
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   if (name->Equals(context, v8_str(isolate, "startProfiling")).FromJust()) {
     return v8::FunctionTemplate::New(isolate,
                                      ProfilerExtension::StartProfiling);
   }
   if (name->Equals(context, v8_str(isolate, "stopProfiling")).FromJust()) {
     return v8::FunctionTemplate::New(isolate, ProfilerExtension::StopProfiling);
   }
   if (name->Equals(context, v8_str(isolate, "collectSample")).FromJust()) {
     return v8::FunctionTemplate::New(isolate, ProfilerExtension::CollectSample);
   }
   CHECK(false);
   return v8::Local<v8::FunctionTemplate>();
 }
 
 void ProfilerExtension::StartProfiling(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
-  last_profile = NULL;
-  v8::CpuProfiler* cpu_profiler = args.GetIsolate()->GetCpuProfiler();
-  cpu_profiler->StartProfiling((args.Length() > 0)
-      ? args[0].As<v8::String>()
-      : v8::String::Empty(args.GetIsolate()));
+  last_profile = nullptr;
+  Scope::profiler_->StartProfiling((args.Length() > 0)
+                                       ? args[0].As<v8::String>()
+                                       : v8::String::Empty(args.GetIsolate()));
 }
 
 void ProfilerExtension::StopProfiling(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
-  v8::CpuProfiler* cpu_profiler = args.GetIsolate()->GetCpuProfiler();
-  last_profile = cpu_profiler->StopProfiling((args.Length() > 0)
-      ? args[0].As<v8::String>()
-      : v8::String::Empty(args.GetIsolate()));
+  last_profile = Scope::profiler_->StopProfiling(
+      (args.Length() > 0) ? args[0].As<v8::String>()
+                          : v8::String::Empty(args.GetIsolate()));
 }
 
 void ProfilerExtension::CollectSample(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
-  args.GetIsolate()->GetCpuProfiler()->CollectSample();
+  Scope::profiler_->CollectSample();
 }
 
 }  // namespace internal
 }  // namespace v8