WIP SharedArrayBuffer implementation

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 0aefb4c06d020e16348ce8b43eaec89b4d79cdbb..0d59b5a4658e03f955ced7cde0c923a404f10913 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -174,6 +174,9 @@ enum KeyedAccessStoreMode {
 };
 
 
+enum SharedFlag { NOT_SHARED, SHARED };
+
+
 enum ContextualMode {
   NOT_CONTEXTUAL,
   CONTEXTUAL
@@ -457,6 +460,8 @@ const int kStubMinorKeyBits = kSmiValueSize - kStubMajorKeyBits - 1;
   V(JS_ARRAY_BUFFER_TYPE)                                       \
   V(JS_TYPED_ARRAY_TYPE)                                        \
   V(JS_DATA_VIEW_TYPE)                                          \
+  V(JS_SHARED_ARRAY_BUFFER_TYPE)                                \
+  V(JS_SHARED_TYPED_ARRAY_TYPE)                                 \
   V(JS_PROXY_TYPE)                                              \
   V(JS_SET_TYPE)                                                \
   V(JS_MAP_TYPE)                                                \
@@ -758,6 +763,8 @@ enum InstanceType {
   JS_ARRAY_BUFFER_TYPE,
   JS_TYPED_ARRAY_TYPE,
   JS_DATA_VIEW_TYPE,
+  JS_SHARED_ARRAY_BUFFER_TYPE,
+  JS_SHARED_TYPED_ARRAY_TYPE,
   JS_SET_TYPE,
   JS_MAP_TYPE,
   JS_SET_ITERATOR_TYPE,
@@ -10265,6 +10272,8 @@ class JSArrayBuffer: public JSObject {
   inline bool was_neutered();
   inline void set_was_neutered(bool value);
 
+  inline bool is_shared();
+
   DECLARE_CAST(JSArrayBuffer)
 
   void Neuter();
@@ -10312,6 +10321,8 @@ class JSArrayBufferView: public JSObject {
 
   inline bool WasNeutered() const;
 
+  inline bool is_shared() const;
+
   static const int kBufferOffset = JSObject::kHeaderSize;
   static const int kByteOffsetOffset = kBufferOffset + kPointerSize;
   static const int kByteLengthOffset = kByteOffsetOffset + kPointerSize;