- Pass the knowledge whether the old GC is compacting to the GC prologue and ...

src/heap.h

 // Copyright 2006-2008 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 549 matching lines @@
 
   // Makes a new native code object
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed. On success, the pointer to the Code object is stored in the
   // self_reference. This allows generated code to reference its own Code
   // object by containing this pointer.
   // Please note this function does not perform a garbage collection.
   static Object* CreateCode(const CodeDesc& desc,
                             ScopeInfo<>* sinfo,
                             Code::Flags flags,
-                            Code** self_reference = NULL);
+                            Handle<Object> self_reference);
 
   static Object* CopyCode(Code* code);
   // Finds the symbol for string in the symbol table.
   // If not found, a new symbol is added to the table and returned.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if allocation
   // failed.
   // Please note this function does not perform a garbage collection.
   static Object* LookupSymbol(Vector<const char> str);
   static Object* LookupAsciiSymbol(const char* str) {
     return LookupSymbol(CStrVector(str));
@@ skipping 335 matching lines @@
   // Allocate empty fixed array.
   static Object* AllocateEmptyFixedArray();
 
   // Performs a minor collection in new generation.
   static void Scavenge();
 
   // Performs a major collection in the whole heap.
   static void MarkCompact(GCTracer* tracer);
 
   // Code to be run before and after mark-compact.
-  static void MarkCompactPrologue();
-  static void MarkCompactEpilogue();
+  static void MarkCompactPrologue(bool is_compacting);
+  static void MarkCompactEpilogue(bool is_compacting);
 
   // Helper function used by CopyObject to copy a source object to an
   // allocated target object and update the forwarding pointer in the source
   // object.  Returns the target object.
   static HeapObject* MigrateObject(HeapObject* source,
                                    HeapObject* target,
                                    int size);
 
   // Helper function that governs the promotion policy from new space to
   // old.  If the object's old address lies below the new space's age
@@ skipping 342 matching lines @@
   int marked_count_;
 
   // The count from the end of the previous full GC.  Will be zero if there
   // was no previous full GC.
   int previous_marked_count_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_