WIP [esnext] implement async iteration proposal

src/objects-inl.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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 126 matching lines @@
 TYPE_CHECKER(BytecodeArray, BYTECODE_ARRAY_TYPE)
 TYPE_CHECKER(Cell, CELL_TYPE)
 TYPE_CHECKER(Code, CODE_TYPE)
 TYPE_CHECKER(FixedDoubleArray, FIXED_DOUBLE_ARRAY_TYPE)
 TYPE_CHECKER(Foreign, FOREIGN_TYPE)
 TYPE_CHECKER(FreeSpace, FREE_SPACE_TYPE)
 TYPE_CHECKER(HeapNumber, HEAP_NUMBER_TYPE)
 TYPE_CHECKER(JSArgumentsObject, JS_ARGUMENTS_TYPE)
 TYPE_CHECKER(JSArray, JS_ARRAY_TYPE)
 TYPE_CHECKER(JSArrayBuffer, JS_ARRAY_BUFFER_TYPE)
+TYPE_CHECKER(JSAsyncGeneratorObject, JS_ASYNC_GENERATOR_OBJECT_TYPE)
 TYPE_CHECKER(JSBoundFunction, JS_BOUND_FUNCTION_TYPE)
 TYPE_CHECKER(JSContextExtensionObject, JS_CONTEXT_EXTENSION_OBJECT_TYPE)
 TYPE_CHECKER(JSDataView, JS_DATA_VIEW_TYPE)
 TYPE_CHECKER(JSDate, JS_DATE_TYPE)
 TYPE_CHECKER(JSError, JS_ERROR_TYPE)
 TYPE_CHECKER(JSFunction, JS_FUNCTION_TYPE)
-TYPE_CHECKER(JSGeneratorObject, JS_GENERATOR_OBJECT_TYPE)
 TYPE_CHECKER(JSGlobalObject, JS_GLOBAL_OBJECT_TYPE)
 TYPE_CHECKER(JSMap, JS_MAP_TYPE)
 TYPE_CHECKER(JSMapIterator, JS_MAP_ITERATOR_TYPE)
 TYPE_CHECKER(JSMessageObject, JS_MESSAGE_OBJECT_TYPE)
 TYPE_CHECKER(JSModuleNamespace, JS_MODULE_NAMESPACE_TYPE)
 TYPE_CHECKER(JSPromiseCapability, JS_PROMISE_CAPABILITY_TYPE)
 TYPE_CHECKER(JSPromise, JS_PROMISE_TYPE)
 TYPE_CHECKER(JSRegExp, JS_REGEXP_TYPE)
 TYPE_CHECKER(JSSet, JS_SET_TYPE)
 TYPE_CHECKER(JSSetIterator, JS_SET_ITERATOR_TYPE)
@@ skipping 28 matching lines @@
   InstanceType instance_type = map()->instance_type();
   return instance_type == FIXED_ARRAY_TYPE ||
          instance_type == TRANSITION_ARRAY_TYPE;
 }
 
 // External objects are not extensible, so the map check is enough.
 bool HeapObject::IsExternal() const {
   return map() == GetHeap()->external_map();
 }
 
+bool HeapObject::IsJSGeneratorObject() const {
+  return map()->instance_type() == JS_GENERATOR_OBJECT_TYPE ||
+         IsJSAsyncGeneratorObject();
+}
+
 #define SIMD128_TYPE_CHECKER(TYPE, Type, type, lane_count, lane_type) \
   bool HeapObject::Is##Type() const { return map() == GetHeap()->type##_map(); }
 SIMD128_TYPES(SIMD128_TYPE_CHECKER)
 #undef SIMD128_TYPE_CHECKER
 
 #define IS_TYPE_FUNCTION_DEF(type_)                               \
   bool Object::Is##type_() const {                                \
     return IsHeapObject() && HeapObject::cast(this)->Is##type_(); \
   }
 HEAP_OBJECT_TYPE_LIST(IS_TYPE_FUNCTION_DEF)
@@ skipping 427 matching lines @@
 CAST_ACCESSOR(Int32x4)
 CAST_ACCESSOR(Int8x16)
 CAST_ACCESSOR(JSArray)
 CAST_ACCESSOR(JSArrayBuffer)
 CAST_ACCESSOR(JSArrayBufferView)
 CAST_ACCESSOR(JSBoundFunction)
 CAST_ACCESSOR(JSDataView)
 CAST_ACCESSOR(JSDate)
 CAST_ACCESSOR(JSFunction)
 CAST_ACCESSOR(JSGeneratorObject)
+CAST_ACCESSOR(JSAsyncGeneratorObject)
 CAST_ACCESSOR(JSGlobalObject)
 CAST_ACCESSOR(JSGlobalProxy)
 CAST_ACCESSOR(JSMap)
 CAST_ACCESSOR(JSMapIterator)
 CAST_ACCESSOR(JSMessageObject)
 CAST_ACCESSOR(JSModuleNamespace)
 CAST_ACCESSOR(JSObject)
 CAST_ACCESSOR(JSProxy)
 CAST_ACCESSOR(JSReceiver)
 CAST_ACCESSOR(JSRegExp)
@@ skipping 1492 matching lines @@
   // Check for the most common kind of JavaScript object before
   // falling into the generic switch. This speeds up the internal
   // field operations considerably on average.
   if (type == JS_OBJECT_TYPE) return JSObject::kHeaderSize;
   switch (type) {
     case JS_API_OBJECT_TYPE:
     case JS_SPECIAL_API_OBJECT_TYPE:
       return JSObject::kHeaderSize;
     case JS_GENERATOR_OBJECT_TYPE:
       return JSGeneratorObject::kSize;
+    case JS_ASYNC_GENERATOR_OBJECT_TYPE:
+      return JSAsyncGeneratorObject::kSize;
     case JS_GLOBAL_PROXY_TYPE:
       return JSGlobalProxy::kSize;
     case JS_GLOBAL_OBJECT_TYPE:
       return JSGlobalObject::kSize;
     case JS_BOUND_FUNCTION_TYPE:
       return JSBoundFunction::kSize;
     case JS_FUNCTION_TYPE:
       return JSFunction::kSize;
     case JS_VALUE_TYPE:
       return JSValue::kSize;
@@ skipping 3562 matching lines @@
 ACCESSORS(PromiseReactionJobInfo, deferred_promise, Object,
           kDeferredPromiseOffset);
 ACCESSORS(PromiseReactionJobInfo, deferred_on_resolve, Object,
           kDeferredOnResolveOffset);
 ACCESSORS(PromiseReactionJobInfo, deferred_on_reject, Object,
           kDeferredOnRejectOffset);
 SMI_ACCESSORS(PromiseReactionJobInfo, debug_id, kDebugIdOffset);
 SMI_ACCESSORS(PromiseReactionJobInfo, debug_name, kDebugNameOffset);
 ACCESSORS(PromiseReactionJobInfo, context, Context, kContextOffset);
 
+ACCESSORS(AsyncGeneratorRequest, next, Object, kNextOffset)
+SMI_ACCESSORS(AsyncGeneratorRequest, resume_mode, kResumeModeOffset)
+ACCESSORS(AsyncGeneratorRequest, value, Object, kValueOffset)
+ACCESSORS(AsyncGeneratorRequest, promise, Object, kPromiseOffset)
+ACCESSORS(AsyncGeneratorRequest, awaited_promise, Object, kAwaitedPromiseOffset)
+
 Map* PrototypeInfo::ObjectCreateMap() {
   return Map::cast(WeakCell::cast(object_create_map())->value());
 }
 
 // static
 void PrototypeInfo::SetObjectCreateMap(Handle<PrototypeInfo> info,
                                        Handle<Map> map) {
   Handle<WeakCell> cell = Map::WeakCellForMap(map);
   info->set_object_create_map(*cell);
 }
@@ skipping 1012 matching lines @@
 }
 
 bool JSGeneratorObject::is_closed() const {
   return continuation() == kGeneratorClosed;
 }
 
 bool JSGeneratorObject::is_executing() const {
   return continuation() == kGeneratorExecuting;
 }
 
+ACCESSORS(JSAsyncGeneratorObject, queue, HeapObject, kQueueOffset)
+
 ACCESSORS(JSValue, value, Object, kValueOffset)
 
 
 HeapNumber* HeapNumber::cast(Object* object) {
   SLOW_DCHECK(object->IsHeapNumber() || object->IsMutableHeapNumber());
   return reinterpret_cast<HeapNumber*>(object);
 }
 
 
 const HeapNumber* HeapNumber::cast(const Object* object) {
@@ skipping 1617 matching lines @@
 ACCESSORS(JSIteratorResult, value, Object, kValueOffset)
 ACCESSORS(JSIteratorResult, done, Object, kDoneOffset)
 
 ACCESSORS(JSArrayIterator, object, Object, kIteratedObjectOffset)
 ACCESSORS(JSArrayIterator, index, Object, kNextIndexOffset)
 ACCESSORS(JSArrayIterator, object_map, Object, kIteratedObjectMapOffset)
 
 ACCESSORS(JSStringIterator, string, String, kStringOffset)
 SMI_ACCESSORS(JSStringIterator, index, kNextIndexOffset)
 
+ACCESSORS(JSAsyncFromSyncIterator, sync_iterator, HeapObject,
+          kSyncIteratorOffset)
+
 #undef INT_ACCESSORS
 #undef ACCESSORS
 #undef ACCESSORS_CHECKED
 #undef ACCESSORS_CHECKED2
 #undef SMI_ACCESSORS
 #undef SYNCHRONIZED_SMI_ACCESSORS
 #undef NOBARRIER_SMI_ACCESSORS
 #undef BOOL_GETTER
 #undef BOOL_ACCESSORS
 #undef FIELD_ADDR
@@ skipping 30 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_