Fix invariant so that we cannot record relocation slots for

src/incremental-marking.h

 // 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:
 //
 //     * 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 114 matching lines @@
   }
 
   static void RecordWriteFromCode(HeapObject* obj,
                                   Object* value,
                                   Isolate* isolate);
 
   static void RecordWriteForEvacuationFromCode(HeapObject* obj,
                                                Object** slot,
                                                Isolate* isolate);
 
+  // Returns true if you need to record a slot.

[Vyacheslav Egorov (Google), 2012/09/11 13:51:12]

Enhance comment:

record a slot for compation. Returns false for objects that are guaranteed to be
rescaned or not guaranteed to survive.

No slots in white objects should be recorded as some slots are typed and cannot
be interpreted corrrectly if the underlying object does not survive incremental
cycle (stays white).

   INLINE(bool BaseRecordWrite(HeapObject* obj, Object** slot, Object* value));
   INLINE(void RecordWrite(HeapObject* obj, Object** slot, Object* value));
   INLINE(void RecordWriteIntoCode(HeapObject* obj,
                                   RelocInfo* rinfo,
                                   Object* value));
   INLINE(void RecordWriteOfCodeEntry(JSFunction* host,
                                      Object** slot,
                                      Code* value));
 
 
@@ skipping 140 matching lines @@
   intptr_t allocated_;
 
   int no_marking_scope_depth_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(IncrementalMarking);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_INCREMENTAL_MARKING_H_