Adding freelist statistics to blink gc dump provider.

Source/platform/heap/ThreadState.cpp

 /*
  * Copyright (C) 2013 Google Inc. 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
@@ skipping 945 matching lines @@
 
     if (gcType == GCWithSweep) {
         setGCState(EagerSweepScheduled);
     } else if (gcType == GCWithoutSweep) {
         setGCState(LazySweepScheduled);
     } else {
         takeSnapshot();
 
         // This unmarks all marked objects and marks all unmarked objects dead.
         makeConsistentForMutator();
 

[haraken, 2015/06/24 03:46:21]

Sorry, you need to call takeSnapshotOfFreeList here (i.e., after
makeConsistentForMutator). makeConsistentForMutator rebuilds the free list.

[ssid, 2015/06/24 05:45:29]

Done.

         // Force setting NoGCScheduled to circumvent checkThread()
         // in setGCState().
         m_gcState = NoGCScheduled;
     }
 }
 
 void ThreadState::preSweep()
 {
     checkThread();
     if (gcState() != EagerSweepScheduled && gcState() != LazySweepScheduled)
@@ skipping 400 matching lines @@
 {
     ASSERT(isInGC());
 
     int numberOfHeapsReported = 0;
 #define SNAPSHOT_HEAP(HeapType)                                                                                \
     {                                                                                                          \
         numberOfHeapsReported++;                                                                               \
         String allocatorBaseName;                                                                              \
         allocatorBaseName = String::format("blink_gc/thread_%lu/heaps/" #HeapType, (unsigned long)(m_thread)); \
         m_heaps[HeapType##HeapIndex]->takeSnapshot(allocatorBaseName);                                         \
+        m_heaps[HeapType##HeapIndex]->takeFreelistSnapshot(allocatorBaseName);                                 \
     }
 
     SNAPSHOT_HEAP(NormalPage1);
     SNAPSHOT_HEAP(NormalPage2);
     SNAPSHOT_HEAP(NormalPage3);
     SNAPSHOT_HEAP(NormalPage4);
     SNAPSHOT_HEAP(EagerSweep);
     SNAPSHOT_HEAP(Vector1);
     SNAPSHOT_HEAP(Vector2);
     SNAPSHOT_HEAP(Vector3);
@@ skipping 98 matching lines @@
         json->beginArray(it->key.ascii().data());
         for (size_t age = 0; age <= maxHeapObjectAge; ++age)
             json->pushInteger(it->value.ages[age]);
         json->endArray();
     }
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(TRACE_DISABLED_BY_DEFAULT("blink_gc"), statsName, this, json.release());
 }
 #endif
 
 } // namespace blink