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

src/api.h

 // Copyright 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 130 matching lines @@
                          void** values, int length)
     : data_(data), holder_(holder), callee_(callee),
       is_construct_call_(is_construct_call),
       values_(values), length_(length) { }
 
 
 enum ExtensionTraversalState {
   UNVISITED, VISITED, INSTALLED
 };
 
+class RegisteredExtension;
+
+class internal::ApiData {
+ public:
+  StringInputBuffer write_input_buffer_;
+  // To distinguish the function templates, so that we can find them in the
+  // function cache of the global context.
+  int next_serial_number_;
+
+  EmbeddedVector<char, 128> buffer_;
+
+  ApiData()
+    :next_serial_number_(0) {
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(ApiData);
+};
 
 class RegisteredExtension {
  public:
   explicit RegisteredExtension(Extension* extension);
   static void Register(RegisteredExtension* that);
   Extension* extension() { return extension_; }
   RegisteredExtension* next() { return next_; }
   RegisteredExtension* next_auto() { return next_auto_; }
   ExtensionTraversalState state() { return state_; }
   void set_state(ExtensionTraversalState value) { state_ = value; }
@@ skipping 309 matching lines @@
 #ifdef DEBUG
   v8::ImplementationUtilities::ZapHandleRange(
       spare_,
       &spare_[kHandleBlockSize]);
 #endif
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_API_H_