Replacing circular queue by single buffer in CPU Profiler.

src/cpu-profiler-inl.h

Index: src/cpu-profiler-inl.h
diff --git a/src/cpu-profiler-inl.h b/src/cpu-profiler-inl.h
index 4982197cabaf418006431f15d107fa29e6af8f2a..010f23f7e3e7138c7332a721a969ed6b3d41c76e 100644
--- a/src/cpu-profiler-inl.h
+++ b/src/cpu-profiler-inl.h
@@ -31,7 +31,6 @@
 #include "cpu-profiler.h"
 
 #include <new>
-#include "circular-queue-inl.h"
 #include "profile-generator-inl.h"
 #include "unbound-queue-inl.h"
 
@@ -56,11 +55,12 @@ void SharedFunctionInfoMoveEventRecord::UpdateCodeMap(CodeMap* code_map) {
 }
 
 
-TickSample* ProfilerEventsProcessor::TickSampleEvent() {
+TickSample* ProfilerEventsProcessor::StartTickSampleEvent() {
+  if (!ticks_buffer_is_empty_)
+    return NULL;

[Jakob Kummerow, 2012/09/04 11:25:18]

Please either move this onto the same line as the "if", or put {} around it. (V8
differs from Chromium style here, we don't omit the {} unless everything is on
the same line.)

   generator_->Tick();
-  TickSampleEventRecord* evt =
-      new(ticks_buffer_.Enqueue()) TickSampleEventRecord(enqueue_order_);
-  return &evt->sample;
+  ticks_buffer_ = TickSampleEventRecord(enqueue_order_);
+  return &ticks_buffer_.sample;
 }