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

src/factory.h

Index: src/factory.h
===================================================================
--- src/factory.h	(revision 3427)
+++ src/factory.h	(working copy)
@@ -315,7 +315,7 @@
 #define ROOT_ACCESSOR(type, name, camel_name)                                  \
   static inline Handle<type> name() {                                          \
     return Handle<type>(bit_cast<type**, Object**>(                            \
-        &Heap::roots_[Heap::k##camel_name##RootIndex]));                       \
+        &v8_context()->heap_data_.roots_[Heap::k##camel_name##RootIndex]));    \
   }
   ROOT_LIST(ROOT_ACCESSOR)
 #undef ROOT_ACCESSOR_ACCESSOR
@@ -323,13 +323,13 @@
 #define SYMBOL_ACCESSOR(name, str) \
   static inline Handle<String> name() {                                        \
     return Handle<String>(bit_cast<String**, Object**>(                        \
-        &Heap::roots_[Heap::k##name##RootIndex]));                             \
+        &v8_context()->heap_data_.roots_[Heap::k##name##RootIndex]));          \
   }
   SYMBOL_LIST(SYMBOL_ACCESSOR)
 #undef SYMBOL_ACCESSOR
 
   static Handle<String> hidden_symbol() {
-    return Handle<String>(&Heap::hidden_symbol_);
+    return Handle<String>(&v8_context()->heap_data_.hidden_symbol_);
   }
 
   static Handle<SharedFunctionInfo> NewSharedFunctionInfo(Handle<String> name);