Make output of Dart_TimelineGetTrace consumable by mojo

runtime/vm/timeline.h

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_TIMELINE_H_
 #define VM_TIMELINE_H_
 
 #include "vm/allocation.h"
 #include "vm/bitfield.h"
 
@@ skipping 472 matching lines @@
 // Recorder of |TimelineEvent|s.
 class TimelineEventRecorder {
  public:
   TimelineEventRecorder();
   virtual ~TimelineEventRecorder() {}
 
   TimelineEventBlock* GetNewBlock();
 
   // Interface method(s) which must be implemented.
   virtual void PrintJSON(JSONStream* js, TimelineEventFilter* filter) = 0;
+  virtual void PrintTraceEvent(JSONStream* js, TimelineEventFilter* filter) = 0;
 
   int64_t GetNextAsyncId();
 
   void FinishBlock(TimelineEventBlock* block);
 
  protected:
   void WriteTo(const char* directory);
 
   // Interface method(s) which must be implemented.
   virtual TimelineEvent* StartEvent() = 0;
@@ skipping 26 matching lines @@
 
 // A recorder that stores events in a ring buffer of fixed capacity.
 class TimelineEventRingRecorder : public TimelineEventRecorder {
  public:
   static const intptr_t kDefaultCapacity = 8192;
 
   explicit TimelineEventRingRecorder(intptr_t capacity = kDefaultCapacity);
   ~TimelineEventRingRecorder();
 
   void PrintJSON(JSONStream* js, TimelineEventFilter* filter);
+  void PrintTraceEvent(JSONStream* js, TimelineEventFilter* filter);
 
  protected:
   TimelineEvent* StartEvent();
   void CompleteEvent(TimelineEvent* event);
   TimelineEventBlock* GetHeadBlockLocked();
   intptr_t FindOldestBlockIndex() const;
   TimelineEventBlock* GetNewBlockLocked(Isolate* isolate);
 
   void PrintJSONEvents(JSONArray* array, TimelineEventFilter* filter) const;
 
   TimelineEventBlock** blocks_;
   intptr_t capacity_;
   intptr_t num_blocks_;
   intptr_t block_cursor_;
 };
 
 
 // An abstract recorder that calls |StreamEvent| whenever an event is complete.
 class TimelineEventStreamingRecorder : public TimelineEventRecorder {
  public:
   TimelineEventStreamingRecorder();
   ~TimelineEventStreamingRecorder();
 
   void PrintJSON(JSONStream* js, TimelineEventFilter* filter);
+  void PrintTraceEvent(JSONStream* js, TimelineEventFilter* filter);
 
   // Called when |event| is ready to be streamed. It is unsafe to keep a
   // reference to |event| as it may be freed as soon as this function returns.
   virtual void StreamEvent(TimelineEvent* event) = 0;
 
  protected:
   TimelineEventBlock* GetNewBlockLocked(Isolate* isolate) {
     return NULL;
   }
   TimelineEventBlock* GetHeadBlockLocked() {
     return NULL;
   }
   TimelineEvent* StartEvent();
   void CompleteEvent(TimelineEvent* event);
 };
 
 
 // A recorder that stores events in chains of blocks of events.
 // NOTE: This recorder will continue to allocate blocks until it exhausts
 // memory.
 class TimelineEventEndlessRecorder : public TimelineEventRecorder {
  public:
   TimelineEventEndlessRecorder();
 
-  // NOTE: Calling this while threads are filling in their blocks is not safe
-  // and there are no checks in place to ensure that doesn't happen.
-  // TODO(koda): Add isolate count to |ThreadRegistry| and verify that it is 1.
   void PrintJSON(JSONStream* js, TimelineEventFilter* filter);
+  void PrintTraceEvent(JSONStream* js, TimelineEventFilter* filter);
 
  protected:
   TimelineEvent* StartEvent();
   void CompleteEvent(TimelineEvent* event);
   TimelineEventBlock* GetNewBlockLocked(Isolate* isolate);
   TimelineEventBlock* GetHeadBlockLocked();
 
   void PrintJSONEvents(JSONArray* array, TimelineEventFilter* filter) const;
 
   // Useful only for testing. Only works for one thread.
@@ skipping 21 matching lines @@
   TimelineEventBlock* Next();
 
  private:
   TimelineEventBlock* current_;
   TimelineEventRecorder* recorder_;
 };
 
 }  // namespace dart
 
 #endif  // VM_TIMELINE_H_