Simple BlinkGC heap compaction.

third_party/WebKit/Source/platform/heap/Heap.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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "platform/heap/Heap.h"
 
 #include "platform/Histogram.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/heap/BlinkGCMemoryDumpProvider.h"
 #include "platform/heap/CallbackStack.h"
+#include "platform/heap/HeapCompact.h"
 #include "platform/heap/MarkingVisitor.h"
 #include "platform/heap/PageMemory.h"
 #include "platform/heap/PagePool.h"
 #include "platform/heap/SafePoint.h"
 #include "platform/heap/ThreadState.h"
 #include "platform/tracing/TraceEvent.h"
 #include "platform/tracing/web_memory_allocator_dump.h"
 #include "platform/tracing/web_process_memory_dump.h"
 #include "public/platform/Platform.h"
 #include "wtf/Assertions.h"
@@ skipping 357 matching lines @@
 }
 #endif
 
 void ThreadHeap::commitCallbackStacks() {
   m_markingStack->commit();
   m_postMarkingCallbackStack->commit();
   m_globalWeakCallbackStack->commit();
   m_ephemeronStack->commit();
 }
 
+HeapCompact* ThreadHeap::compaction() {
+  if (!m_compaction)
+    m_compaction = HeapCompact::create();
+  return m_compaction.get();
+}
+
+void ThreadHeap::registerMovingObjectReference(MovableReference* slot) {
+  DCHECK(slot && *slot);

[haraken, 2016/12/09 07:25:54]

DCHECK(slot);
DCHECK(*slot);

It would help to identify which dcheck failed.

[sof, 2016/12/09 21:44:03]

Done.

+  compaction()->registerMovingObjectReference(slot);
+}
+
+void ThreadHeap::registerMovingObjectCallback(MovableReference reference,
+                                              MovingObjectCallback callback,
+                                              void* callbackData) {
+  DCHECK(reference);
+  compaction()->registerMovingObjectCallback(reference, callback, callbackData);
+}
+
 void ThreadHeap::decommitCallbackStacks() {
   m_markingStack->decommit();
   m_postMarkingCallbackStack->decommit();
   m_globalWeakCallbackStack->decommit();
   m_ephemeronStack->decommit();
 }
 
 void ThreadHeap::preGC() {
   ASSERT(!ThreadState::current()->isInGC());
   for (ThreadState* state : m_threads)
@@ skipping 216 matching lines @@
   ProcessHeap::decreaseTotalMarkedObjectSize(m_stats.markedObjectSize());
 
   m_stats.reset();
   for (ThreadState* state : m_threads)
     state->resetHeapCounters();
 }
 
 ThreadHeap* ThreadHeap::s_mainThreadHeap = nullptr;
 
 }  // namespace blink