[profiler] Tracing-based CPU profiler.

src/profiler/cpu-profiler.cc

 // Copyright 2012 the V8 project 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 "src/profiler/cpu-profiler.h"
 
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/frames-inl.h"
 #include "src/locked-queue-inl.h"
@@ skipping 308 matching lines @@
     logger->LogCodeObjects();
   }
   logger->LogCompiledFunctions();
   logger->LogAccessorCallbacks();
   LogBuiltins();
   // Enable stack sampling.
   processor_->AddCurrentStack(isolate_);
   processor_->StartSynchronously();
 }
 
-
 CpuProfile* CpuProfiler::StopProfiling(const char* title) {
   if (!is_profiling_) return nullptr;
   StopProcessorIfLastProfile(title);
-  CpuProfile* result = profiles_->StopProfiling(title);
-  if (result) {
-    result->Print();
-  }
-  return result;
+  return profiles_->StopProfiling(title);
 }
 
-
 CpuProfile* CpuProfiler::StopProfiling(String* title) {
-  if (!is_profiling_) return nullptr;
-  const char* profile_title = profiles_->GetName(title);
-  StopProcessorIfLastProfile(profile_title);
-  return profiles_->StopProfiling(profile_title);
+  return StopProfiling(profiles_->GetName(title));
 }
 
-
 void CpuProfiler::StopProcessorIfLastProfile(const char* title) {
-  if (profiles_->IsLastProfile(title)) {
-    StopProcessor();
-  }
+  if (!profiles_->IsLastProfile(title)) return;
+  StopProcessor();
 }
 
-
 void CpuProfiler::StopProcessor() {
   Logger* logger = isolate_->logger();
   is_profiling_ = false;
   isolate_->set_is_profiling(false);
   ProfilerListener* profiler_listener = logger->profiler_listener();
   profiler_listener->RemoveObserver(this);
   processor_->StopSynchronously();
   logger->TearDownProfilerListener();
   processor_.reset();
   generator_.reset();
   logger->is_logging_ = saved_is_logging_;
 }
 
 
 void CpuProfiler::LogBuiltins() {
   Builtins* builtins = isolate_->builtins();
   DCHECK(builtins->is_initialized());
   for (int i = 0; i < Builtins::builtin_count; i++) {
     CodeEventsContainer evt_rec(CodeEventRecord::REPORT_BUILTIN);
     ReportBuiltinEventRecord* rec = &evt_rec.ReportBuiltinEventRecord_;
     Builtins::Name id = static_cast<Builtins::Name>(i);
     rec->start = builtins->builtin(id)->address();
     rec->builtin_id = id;
     processor_->Enqueue(evt_rec);
   }
 }
 
 }  // namespace internal
 }  // namespace v8