Implement map collection for incremental marking.

src/incremental-marking-inl.h

Index: src/incremental-marking-inl.h
diff --git a/src/incremental-marking-inl.h b/src/incremental-marking-inl.h
index 5ce003f31d4c0d27e81a66df22ad269f11810ca4..11f76eac770b466acd7363ba7da5ad11bcaf58a0 100644
--- a/src/incremental-marking-inl.h
+++ b/src/incremental-marking-inl.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -128,6 +128,28 @@ void IncrementalMarking::WhiteToGrey(HeapObject* obj, MarkBit mark_bit) {
 }
 
 
+bool IncrementalMarking::MarkObject(HeapObject* obj) {

[Vyacheslav Egorov (Chromium), 2012/05/11 12:58:35]

I suggest naming it MarkObjectAndPush

[Michael Starzinger, 2012/05/11 14:51:53]

Done.

+  MarkBit mark_bit = Marking::MarkBitFrom(obj);
+  if (!mark_bit.Get()) {
+    WhiteToGreyAndPush(obj, mark_bit);
+    MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
+    return true;
+  }
+  return false;
+}
+
+
+bool IncrementalMarking::MarkObjectWithoutPush(HeapObject* obj) {
+  MarkBit mark_bit = Marking::MarkBitFrom(obj);
+  if (!mark_bit.Get()) {
+    MarkBlackOrKeepGrey(mark_bit);

[Vyacheslav Egorov (Chromium), 2012/05/11 12:58:35]

Can it be grey at this point? I don't think so.

[Michael Starzinger, 2012/05/11 14:51:53]

Done, inlined mark bit setting.

+    MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
+    return true;
+  }
+  return false;
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_INCREMENTAL_MARKING_INL_H_