Simple BlinkGC heap compaction.

third_party/WebKit/Source/platform/heap/Heap.cpp

Index: third_party/WebKit/Source/platform/heap/Heap.cpp
diff --git a/third_party/WebKit/Source/platform/heap/Heap.cpp b/third_party/WebKit/Source/platform/heap/Heap.cpp
index bc83a90b9886d3b9b3a41c77f2e50dee28f1a5de..aa0f8d765ec99f2b45b19feca258d735b07663aa 100644
--- a/third_party/WebKit/Source/platform/heap/Heap.cpp
+++ b/third_party/WebKit/Source/platform/heap/Heap.cpp
@@ -35,6 +35,7 @@
 #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"
@@ -412,6 +413,28 @@ void ThreadHeap::commitCallbackStacks() {
   m_ephemeronStack->commit();
 }
 
+HeapCompact* ThreadHeap::compaction() {
+  if (!m_compaction)
+    m_compaction = HeapCompact::create();
+  return m_compaction.get();
+}
+
+void ThreadHeap::registerMovingObjectReference(MovableReference* slot) {
+  compaction()->registerMovingObjectReference(slot);

[haraken, 2016/12/02 12:43:19]

DCHECK(*slot) ?

[sof, 2016/12/04 14:55:37]

Extended to (slot && *slot).

+}
+
+void ThreadHeap::registerMovingObjectCallback(MovableReference reference,
+                                              MovingObjectCallback callback,
+                                              void* callbackData) {
+  DCHECK(reference);
+  compaction()->registerMovingObjectCallback(reference, callback, callbackData);
+}
+
+void ThreadHeap::registerRelocation(MovableReference* slot) {
+  DCHECK(slot);

[haraken, 2016/12/02 12:43:19]

Do you want to mean DCHECK(*slot) ?

[sof, 2016/12/04 14:55:37]

Done.

+  compaction()->registerRelocation(slot);
+}
+
 void ThreadHeap::decommitCallbackStacks() {
   m_markingStack->decommit();
   m_postMarkingCallbackStack->decommit();