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..7fb5bf00f03c601abbd3702d62474937d8efa0a6 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 +413,24 @@ 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) {
+  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();