Patch for allowing several V8 instances in process:...

src/disassembler.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 31 matching lines @@
   static int Decode(FILE* f, byte* begin, byte* end);
 
   // Decode instructions in code.
   static void Decode(FILE* f, Code* code);
  private:
   // Decode instruction at pc and print disassembled instruction into f.
   // Returns the instruction length in bytes, or 1 if the instruction could
   // not be decoded.  The number of characters written is written into
   // the out parameter char_count.
   static int Decode(FILE* f, byte* pc, int* char_count);
+
+  friend class V8Context;
+  static void PostConstruct();
+  static void PreDestroy();
 };
-
 } }  // namespace v8::internal
 
 #endif  // V8_DISASSEMBLER_H_