Robustify the clearing of the cache of map-related ICs on the map.

Review URL: https://chromiumcodereview.appspot.com/9159009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10438 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mark-compact-inl.h

@@ -49,6 +49,13 @@ void MarkCompactCollector::SetFlags(int flags) {
 }
 
 
+void MarkCompactCollector::ClearCacheOnMap(Map* map) {
+  if (FLAG_cleanup_code_caches_at_gc) {
+    map->ClearCodeCache(heap());
+  }
+}
+
+
 void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
   if (!mark_bit.Get()) {
@@ -64,6 +71,9 @@ void MarkCompactCollector::SetMark(HeapObject* obj, MarkBit mark_bit) {
   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
   mark_bit.Set();
   MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
+  if (obj->IsMap()) {
+    ClearCacheOnMap(Map::cast(obj));
+  }
 }
 
 

src/mark-compact.cc

@@ -1623,9 +1623,7 @@ void MarkCompactCollector::ProcessNewlyMarkedObject(HeapObject* object) {
   ASSERT(HEAP->Contains(object));
   if (object->IsMap()) {
     Map* map = Map::cast(object);
-    if (FLAG_cleanup_code_caches_at_gc) {
-      map->ClearCodeCache(heap());
-    }
+    ClearCacheOnMap(map);
 
     // When map collection is enabled we have to mark through map's transitions
     // in a special way to make transition links weak.

src/mark-compact.h

@@ -624,10 +624,16 @@ class MarkCompactCollector {
 
   void AfterMarking();
 
+  // Marks the object black and pushes it on the marking stack.
+  // This is for non-incremental marking.
   INLINE(void MarkObject(HeapObject* obj, MarkBit mark_bit));
 
+  // Marks the object black.  This is for non-incremental marking.
   INLINE(void SetMark(HeapObject* obj, MarkBit mark_bit));
 
+  // Clears the cache of ICs related to this map.
+  INLINE(void ClearCacheOnMap(Map* map));
+
   void ProcessNewlyMarkedObject(HeapObject* obj);
 
   // Creates back pointers for all map transitions, stores them in