Externalization API for ArrayBuffer

src/objects.h

 // Copyright 2012 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 8750 matching lines @@
 
 
 class JSArrayBuffer: public JSObject {
  public:
   // [backing_store]: backing memory for this array
   DECL_ACCESSORS(backing_store, void)
 
   // [byte_length]: length in bytes
   DECL_ACCESSORS(byte_length, Object)
 
+  // [flags]
+  DECL_ACCESSORS(flag, Smi)
+
+  inline bool is_external();
+  inline void set_is_external(bool value);
+
   // Casting.
   static inline JSArrayBuffer* cast(Object* obj);
 
   // Dispatched behavior.
   DECLARE_PRINTER(JSArrayBuffer)
   DECLARE_VERIFIER(JSArrayBuffer)
 
   static const int kBackingStoreOffset = JSObject::kHeaderSize;
   static const int kByteLengthOffset = kBackingStoreOffset + kPointerSize;
-  static const int kSize = kByteLengthOffset + kPointerSize;
+  static const int kFlagOffset = kByteLengthOffset + kPointerSize;
+  static const int kSize = kFlagOffset + kPointerSize;
 
  private:
+  // Bit position in a flag
+  static const int kIsExternalBit = 0;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSArrayBuffer);
 };
 
 
 class JSTypedArray: public JSObject {
  public:
   // [buffer]: ArrayBuffer that this typed array views.
   DECL_ACCESSORS(buffer, Object)
 
   // [byte_length]: offset of typed array in bytes.
@@ skipping 827 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_