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

src/handles.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 89 matching lines @@
 // handle scope and a new one is created, all allocations will take
 // place in the new handle scope until it is deleted.  After that,
 // new handles will again be allocated in the original handle scope.
 //
 // After the handle scope of a local handle has been deleted the
 // garbage collector will no longer track the object stored in the
 // handle and may deallocate it.  The behavior of accessing a handle
 // for which the handle scope has been deleted is undefined.
 class HandleScope {
  public:
-  HandleScope() : previous_(current_) {
-    current_.extensions = 0;
+  HandleScope() {
+    ImplementationUtilities::HandleScopeData& current =
+      v8_context()->handle_scope_data_;
+    previous_ = current;
+    current.extensions = 0;
   }
 
   ~HandleScope() {
     Leave(&previous_);
   }
 
   // Counts the number of allocated handles.
   static int NumberOfHandles();
 
   // Creates a new handle with the given value.
   template <typename T>
   static inline T** CreateHandle(T* value) {
-    internal::Object** cur = current_.next;
-    if (cur == current_.limit) cur = Extend();
+    ImplementationUtilities::HandleScopeData& current =
+      v8_context()->handle_scope_data_;
+    internal::Object** cur = current.next;
+    if (cur == current.limit) cur = Extend();
     // Update the current next field, set the value in the created
     // handle, and return the result.
-    ASSERT(cur < current_.limit);
-    current_.next = cur + 1;
+    ASSERT(cur < current.limit);
+    current.next = cur + 1;
 
     T** result = reinterpret_cast<T**>(cur);
     *result = value;
     return result;
   }
 
   // Deallocates any extensions used by the current scope.
   static void DeleteExtensions();
 
   static Address current_extensions_address();
   static Address current_next_address();
   static Address current_limit_address();
 
  private:
   // Prevent heap allocation or illegal handle scopes.
   HandleScope(const HandleScope&);
   void operator=(const HandleScope&);
   void* operator new(size_t size);
   void operator delete(void* size_t);
 
-  static v8::ImplementationUtilities::HandleScopeData current_;
-  const v8::ImplementationUtilities::HandleScopeData previous_;
+  ImplementationUtilities::HandleScopeData previous_;
 
   // Pushes a fresh handle scope to be used when allocating new handles.
   static void Enter(
       v8::ImplementationUtilities::HandleScopeData* previous) {
-    *previous = current_;
-    current_.extensions = 0;
+    ImplementationUtilities::HandleScopeData& current =
+      v8_context()->handle_scope_data_;
+    *previous = current;
+    current.extensions = 0;
   }
 
   // Re-establishes the previous scope state. Should be called only
   // once, and only for the current scope.
   static void Leave(
       const v8::ImplementationUtilities::HandleScopeData* previous) {
-    if (current_.extensions > 0) {
+    ImplementationUtilities::HandleScopeData& current =
+      v8_context()->handle_scope_data_;
+    if (current.extensions > 0) {
       DeleteExtensions();
     }
-    current_ = *previous;
+    current = *previous;
 #ifdef DEBUG
-    ZapRange(current_.next, current_.limit);
+    ZapRange(current.next, current.limit);
 #endif
   }
 
   // Extend the handle scope making room for more handles.
   static internal::Object** Extend();
 
   // Zaps the handles in the half-open interval [start, end).
   static void ZapRange(internal::Object** start, internal::Object** end);
 
   friend class v8::HandleScope;
@@ skipping 178 matching lines @@
  private:
   bool has_been_transformed_;  // Tells whether the object has been transformed.
   int unused_property_fields_;  // Captures the unused number of field.
   Handle<JSObject> object_;    // The object being optimized.
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_H_