Remove the different length string types...

include/v8.h

 // Copyright 2007-2009 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 2801 matching lines @@
   static inline int SmiToInt(internal::Object* value) {
     int shift_bits = kSmiTagSize + kSmiShiftSize;
     // Shift down and throw away top 32 bits.
     return static_cast<int>(reinterpret_cast<intptr_t>(value) >> shift_bits);
   }
 };
 
 const int kSmiShiftSize = SmiConstants<sizeof(void*)>::kSmiShiftSize;
 const int kSmiValueSize = SmiConstants<sizeof(void*)>::kSmiValueSize;
 
+template <size_t ptr_size> struct InternalConstants;
+
+// Internal constants for 32-bit systems.
+template <> struct InternalConstants<4> {
+  static const int kStringResourceOffset = 3 * sizeof(void*);
+};
+
+// Internal constants for 64-bit systems.
+template <> struct InternalConstants<8> {
+  static const int kStringResourceOffset = 2 * sizeof(void*);
+};
+
 /**
  * This class exports constants and functionality from within v8 that
  * is necessary to implement inline functions in the v8 api.  Don't
  * depend on functions and constants defined here.
  */
 class Internals {
  public:
 
   // These values match non-compiler-dependent values defined within
   // the implementation of v8.
   static const int kHeapObjectMapOffset = 0;
   static const int kMapInstanceTypeOffset = sizeof(void*) + sizeof(int);
-  static const int kStringResourceOffset = 2 * sizeof(void*);
+  static const int kStringResourceOffset =
+      InternalConstants<sizeof(void*)>::kStringResourceOffset;
+
   static const int kProxyProxyOffset = sizeof(void*);
   static const int kJSObjectHeaderSize = 3 * sizeof(void*);
   static const int kFullStringRepresentationMask = 0x07;
   static const int kExternalTwoByteRepresentationTag = 0x03;
 
   // These constants are compiler dependent so their values must be
   // defined within the implementation.
   V8EXPORT static int kJSObjectType;
   V8EXPORT static int kFirstNonstringType;
   V8EXPORT static int kProxyType;
@@ skipping 361 matching lines @@
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef V8EXPORT_INLINE
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_