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 fc43120019280f4dd8cda4cea7db2c4883e278ec..6480596fba2068fde02811f53f2b5d12d8b2413d 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)
 
 
@@ -1967,8 +1983,10 @@ 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;
@@ -6484,6 +6502,11 @@ void JSArrayBuffer::set_was_neutered(bool value) {
 }
 
 
+bool JSArrayBuffer::is_shared() {
+  return map()->instance_type() == JS_SHARED_ARRAY_BUFFER_TYPE;
+}
+
+
 Object* JSArrayBufferView::byte_offset() const {
   if (WasNeutered()) return Smi::FromInt(0);
   return Object::cast(READ_FIELD(this, kByteOffsetOffset));
@@ -6520,6 +6543,11 @@ bool JSArrayBufferView::WasNeutered() const {
 }
 
 
+bool JSArrayBufferView::is_shared() const {
+  return map()->instance_type() == JS_SHARED_TYPED_ARRAY_TYPE;
+}
+
+
 Object* JSTypedArray::length() const {
   if (WasNeutered()) return Smi::FromInt(0);
   return Object::cast(READ_FIELD(this, kLengthOffset));