First steps towards implementing ArrayBuffer &co in V8

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index b19db9e0b9f439f8a81a2e1655aa29fafe2b9650..37e5d1d25ddd519e7aec2f423ec36e826ddc059d 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -56,6 +56,7 @@
 //       - JSReceiver  (suitable for property access)
 //         - JSObject
 //           - JSArray
+//           - JSArrayBuffer
 //           - JSSet
 //           - JSMap
 //           - JSWeakMap
@@ -399,6 +400,7 @@ const int kStubMinorKeyBits = kBitsPerInt - kSmiTagSize - kStubMajorKeyBits;
   V(JS_BUILTINS_OBJECT_TYPE)                                                   \
   V(JS_GLOBAL_PROXY_TYPE)                                                      \
   V(JS_ARRAY_TYPE)                                                             \
+  V(JS_ARRAY_BUFFER_TYPE)                                                      \
   V(JS_PROXY_TYPE)                                                             \
   V(JS_WEAK_MAP_TYPE)                                                          \
   V(JS_REGEXP_TYPE)                                                            \
@@ -729,6 +731,7 @@ enum InstanceType {
   JS_BUILTINS_OBJECT_TYPE,
   JS_GLOBAL_PROXY_TYPE,
   JS_ARRAY_TYPE,
+  JS_ARRAY_BUFFER_TYPE,
   JS_SET_TYPE,
   JS_MAP_TYPE,
   JS_WEAK_MAP_TYPE,
@@ -974,6 +977,7 @@ class MaybeObject BASE_EMBEDDED {
   V(Foreign)                                   \
   V(Boolean)                                   \
   V(JSArray)                                   \
+  V(JSArrayBuffer)                             \
   V(JSProxy)                                   \
   V(JSFunctionProxy)                           \
   V(JSSet)                                     \
@@ -8472,6 +8476,30 @@ class JSWeakMap: public JSObject {
 };
 
 
+class JSArrayBuffer: public JSObject {
+ public:
+  // [backing_store]: backing memory for thsi array
+  DECL_ACCESSORS(backing_store, void)
+
+  // [byte_length]: length in bytes
+  DECL_ACCESSORS(byte_length, Object)
+
+  // 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;
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(JSArrayBuffer);
+};
+
+
 // Foreign describes objects pointing from JavaScript to C structures.
 // Since they cannot contain references to JS HeapObjects they can be
 // placed in old_data_space.