WIP SharedArrayBuffer implementation

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index b505baa2108cd1fdc1d954d1f780e5ac6bf76865..8dcb4a307ba97f59e4f7ccc4b76725c79d07db6b 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -843,8 +843,24 @@ bool Object::IsBoolean() const {
 
 
 TYPE_CHECKER(JSArray, JS_ARRAY_TYPE)
-TYPE_CHECKER(JSArrayBuffer, JS_ARRAY_BUFFER_TYPE)
-TYPE_CHECKER(JSTypedArray, JS_TYPED_ARRAY_TYPE)
+
+
+bool Object::IsJSArrayBuffer() const {
+  if (!IsHeapObject()) return false;
+
+  InstanceType type = HeapObject::cast(this)->map()->instance_type();
+  return type == JS_ARRAY_BUFFER_TYPE || type == JS_SHARED_ARRAY_BUFFER_TYPE;
+}
+
+
+bool Object::IsJSTypedArray() const {
+  if (!IsHeapObject()) return false;
+
+  InstanceType type = HeapObject::cast(this)->map()->instance_type();
+  return type == JS_TYPED_ARRAY_TYPE || type == JS_SHARED_TYPED_ARRAY_TYPE;
+}
+
+
 TYPE_CHECKER(JSDataView, JS_DATA_VIEW_TYPE)
 
 
@@ -1955,8 +1971,10 @@ int JSObject::GetHeaderSize() {
     case JS_ARRAY_TYPE:
       return JSArray::kSize;
     case JS_ARRAY_BUFFER_TYPE:
+    case JS_SHARED_ARRAY_BUFFER_TYPE:
       return JSArrayBuffer::kSize;
     case JS_TYPED_ARRAY_TYPE:
+    case JS_SHARED_TYPED_ARRAY_TYPE:
       return JSTypedArray::kSize;
     case JS_DATA_VIEW_TYPE:
       return JSDataView::kSize;
@@ -6467,6 +6485,12 @@ void JSArrayBuffer::set_was_neutered(bool value) {
 }
 
 
+SharedFlag JSArrayBuffer::is_shared() {
+  return map()->instance_type() == JS_SHARED_ARRAY_BUFFER_TYPE ? SHARED
+                                                               : NOT_SHARED;
+}
+
+
 ACCESSORS(JSArrayBuffer, weak_next, Object, kWeakNextOffset)
 
 
@@ -6523,6 +6547,12 @@ ACCESSORS(JSTypedArray, raw_length, Object, kLengthOffset)
 #endif
 
 
+SharedFlag JSTypedArray::is_shared() const {
+  return map()->instance_type() == JS_SHARED_TYPED_ARRAY_TYPE ? SHARED
+                                                              : NOT_SHARED;
+}
+
+
 ACCESSORS(JSRegExp, data, Object, kDataOffset)