CPU profiler: sample call stack on profiling start.

src/cpu-profiler.h

 // Copyright 2010 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 87 matching lines @@
   Address start;
   CodeEntry* entry;
   Address code_start;
 
   INLINE(void UpdateCodeMap(CodeMap* code_map));
 };
 
 
 class TickSampleEventRecord BASE_EMBEDDED {
  public:
+  TickSampleEventRecord()
+      : filler(1) {
+    ASSERT(filler != SamplingCircularQueue::kClear);
+  }
+
   // The first machine word of a TickSampleEventRecord must not ever
   // become equal to SamplingCircularQueue::kClear.  As both order and
   // TickSample's first field are not reliable in this sense (order
   // can overflow, TickSample can have all fields reset), we are
   // forced to use an artificial filler field.
   int filler;
   unsigned order;
   TickSample sample;
 
   static TickSampleEventRecord* cast(void* value) {
     return reinterpret_cast<TickSampleEventRecord*>(value);
   }
 
   INLINE(static TickSampleEventRecord* init(void* value));
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(TickSampleEventRecord);
 };
 
 
 // This class implements both the profile events processor thread and
 // methods called by event producers: VM and stack sampler threads.
 class ProfilerEventsProcessor : public Thread {
  public:
   explicit ProfilerEventsProcessor(ProfileGenerator* generator);
   virtual ~ProfilerEventsProcessor() { }
 
@@ skipping 17 matching lines @@
                        int args_count,
                        Address start, unsigned size);
   void CodeMoveEvent(Address from, Address to);
   void CodeDeleteEvent(Address from);
   void FunctionCreateEvent(Address alias, Address start, int security_token_id);
   void FunctionMoveEvent(Address from, Address to);
   void FunctionDeleteEvent(Address from);
   void RegExpCodeCreateEvent(Logger::LogEventsAndTags tag,
                              const char* prefix, String* name,
                              Address start, unsigned size);
+  // Puts current stack into tick sample events buffer.
+  void AddCurrentStack();
 
   // Tick sample events are filled directly in the buffer of the circular
   // queue (because the structure is of fixed width, but usually not all
   // stack frame entries are filled.) This method returns a pointer to the
   // next record of the buffer.
   INLINE(TickSample* TickSampleEvent());
 
  private:
   union CodeEventsContainer {
     CodeEventRecord generic;
 #define DECLARE_CLASS(ignore, type) type type##_;
     CODE_EVENTS_TYPE_LIST(DECLARE_CLASS)
 #undef DECLARE_TYPE
   };
 
   // Called from events processing thread (Run() method.)
   bool ProcessCodeEvent(unsigned* dequeue_order);
   bool ProcessTicks(unsigned dequeue_order);
 
   INLINE(static bool FilterOutCodeCreateEvent(Logger::LogEventsAndTags tag));
 
   ProfileGenerator* generator_;
   bool running_;
   UnboundQueue<CodeEventsContainer> events_buffer_;
   SamplingCircularQueue ticks_buffer_;
+  UnboundQueue<TickSampleEventRecord> ticks_from_vm_buffer_;
   unsigned enqueue_order_;
 };
 
 } }  // namespace v8::internal
 
 
 #define PROFILE(Call)                                  \
   LOG(Call);                                           \
   do {                                                 \
     if (v8::internal::CpuProfiler::is_profiling()) {   \
@@ skipping 74 matching lines @@
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CpuProfiler);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_CPU_PROFILER_H_