Improved, safer handling of the symbol table. The symbols themselves...

src/mark-compact.h

Index: src/mark-compact.h
===================================================================
--- src/mark-compact.h	(revision 1848)
+++ src/mark-compact.h	(working copy)
@@ -161,18 +161,6 @@
     obj->SetMark();
   }
 
-  // Used to clear mark bits during marking for objects that are not
-  // actually live.  Since it updates bookkeeping state, it is not
-  // used when clearing mark bits on live objects (eg, during
-  // sweeping).
-  static inline void ClearMark(HeapObject* obj) {
-    obj->ClearMark();
-    tracer_->decrement_marked_count();
-#ifdef DEBUG
-    UpdateLiveObjectCount(obj, -1);
-#endif
-  }
-
   // Creates back pointers for all map transitions, stores them in
   // the prototype field.  The original prototype pointers are restored
   // in ClearNonLiveTransitions().  All JSObject maps
@@ -185,8 +173,11 @@
   static void MarkDescriptorArray(DescriptorArray* descriptors);
 
   // Mark the heap roots and all objects reachable from them.
-  static void ProcessRoots(RootMarkingVisitor* visitor);
+  static void MarkRoots(RootMarkingVisitor* visitor);
 
+  // Mark the symbol table specially.  References to symbols are weak.

[iposva, 2009/05/05 05:05:19]

Please clarify: References to symbols from the symbol table are weak.

+  static void MarkSymbolTable();
+
   // Mark objects in object groups that have at least one object in the
   // group marked.
   static void MarkObjectGroups();