Parallelize marking phase of mark-sweep/compact collection cycle.

src/assembler.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 269 matching lines @@
   // Read/modify the address of a call instruction. This is used to relocate
   // the break points where straight-line code is patched with a call
   // instruction.
   INLINE(Address call_address());
   INLINE(void set_call_address(Address target));
   INLINE(Object* call_object());
   INLINE(void set_call_object(Object* target));
   INLINE(Object** call_object_address());
 
   template<typename StaticVisitor> inline void Visit();
+  template<typename StaticVisitor, typename Data> inline void Visit(Data data);
   inline void Visit(ObjectVisitor* v);
 
   // Patch the code with some other code.
   void PatchCode(byte* instructions, int instruction_count);
 
   // Patch the code with a call.
   void PatchCodeWithCall(Address target, int guard_bytes);
 
   // Check whether this return sequence has been patched
   // with a call to the debugger.
@@ skipping 316 matching lines @@
   unsigned int num_bits_set;
   for (num_bits_set = 0; x; x >>= 1) {
     num_bits_set += x & 1;
   }
   return num_bits_set;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_