allow disabling of ArrayBuffer neutering

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 9943 matching lines @@
 
   // [flags]
   DECL_ACCESSORS(flag, Smi)
 
   inline bool is_external();
   inline void set_is_external(bool value);
 
   inline bool should_be_freed();
   inline void set_should_be_freed(bool value);
 
+  inline bool is_neuterable();
+  inline void set_is_neuterable(bool value);
+
   // [weak_next]: linked list of array buffers.
   DECL_ACCESSORS(weak_next, Object)
 
   // [weak_first_array]: weak linked list of views.
   DECL_ACCESSORS(weak_first_view, Object)
 
   DECLARE_CAST(JSArrayBuffer)
 
   // Neutering. Only neuters the buffer, not associated typed arrays.
   void Neuter();
 
   // Dispatched behavior.
   DECLARE_PRINTER(JSArrayBuffer)
   DECLARE_VERIFIER(JSArrayBuffer)
 
   static const int kBackingStoreOffset = JSObject::kHeaderSize;
   static const int kByteLengthOffset = kBackingStoreOffset + kPointerSize;
   static const int kFlagOffset = kByteLengthOffset + kPointerSize;
   static const int kWeakNextOffset = kFlagOffset + kPointerSize;
   static const int kWeakFirstViewOffset = kWeakNextOffset + kPointerSize;
   static const int kSize = kWeakFirstViewOffset + kPointerSize;
 
   static const int kSizeWithInternalFields =
       kSize + v8::ArrayBuffer::kInternalFieldCount * kPointerSize;
 
  private:
   // Bit position in a flag
   static const int kIsExternalBit = 0;
   static const int kShouldBeFreed = 1;
+  static const int kIsNeuterableBit = 2;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSArrayBuffer);
 };
 
 
 class JSArrayBufferView: public JSObject {
  public:
   // [buffer]: ArrayBuffer that this typed array views.
   DECL_ACCESSORS(buffer, Object)
 
@@ skipping 906 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_