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

src/objects.h

 // Copyright 2006-2009 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 4173 matching lines @@
 
   // Support for StringInputBuffer.
   void ExternalTwoByteStringReadBlockIntoBuffer(ReadBlockBuffer* buffer,
                                                 unsigned* offset_ptr,
                                                 unsigned chars);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ExternalTwoByteString);
 };
 
+class Relocatable;
+class RelocatableData {
+ public:
+  inline void save(Relocatable* new_top, Relocatable*& saved_old_top) {
+    saved_old_top = top_;
+    top_ = new_top;
+  }
+  inline void restore(Relocatable* top, Relocatable* saved_old_top) {
+    ASSERT_EQ(top_, top);
+    top_ = saved_old_top;
+  }
+ private:
+  friend class V8Context;
+  friend class Relocatable;
+  Relocatable * top_;
+  RelocatableData();
+  DISALLOW_COPY_AND_ASSIGN(RelocatableData);
+};
 
 // Utility superclass for stack-allocated objects that must be updated
 // on gc.  It provides two ways for the gc to update instances, either
 // iterating or updating after gc.
 class Relocatable BASE_EMBEDDED {
  public:
-  inline Relocatable() : prev_(top_) { top_ = this; }
+  inline Relocatable() { v8_context()->relocatable_data_.save(this, prev_); }
   virtual ~Relocatable() {
-    ASSERT_EQ(top_, this);
-    top_ = prev_;
+    v8_context()->relocatable_data_.restore(this, prev_);
   }
   virtual void IterateInstance(ObjectVisitor* v) { }
   virtual void PostGarbageCollection() { }
 
   static void PostGarbageCollectionProcessing();
   static int ArchiveSpacePerThread();
   static char* ArchiveState(char* to);
   static char* RestoreState(char* from);
   static void Iterate(ObjectVisitor* v);
   static void Iterate(ObjectVisitor* v, Relocatable* top);
   static char* Iterate(ObjectVisitor* v, char* t);
  private:
-  static Relocatable* top_;
   Relocatable* prev_;
 };
 
 
 // A flat string reader provides random access to the contents of a
 // string independent of the character width of the string.  The handle
 // must be valid as long as the reader is being used.
 class FlatStringReader : public Relocatable {
  public:
   explicit FlatStringReader(Handle<String> str);
@@ skipping 633 matching lines @@
   static inline int set(int value, int bit_position, bool v) {
     if (v) {
       value |= (1 << bit_position);
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
+class ObjectsData {
+ public:
+  StringInputBuffer string_compare_buffer_a_;
+  StringInputBuffer string_compare_buffer_b_;
+  StaticResource<StringInputBuffer> string_input_buffer_;
+
+ private:
+  friend class V8Context;
+  ObjectsData() {}
+  DISALLOW_COPY_AND_ASSIGN(ObjectsData);
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_