[ESNext] Implement DynamicImportCall

src/factory.cc

 // Copyright 2014 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.
 
 #include "src/factory.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast.h"
 #include "src/base/bits.h"
@@ skipping 897 matching lines @@
       Symbol);
 }
 
 
 Handle<Symbol> Factory::NewPrivateSymbol() {
   Handle<Symbol> symbol = NewSymbol();
   symbol->set_is_private(true);
   return symbol;
 }
 
+Handle<JSPromise> Factory::NewJSPromise() {
+  Handle<JSFunction> constructor(
+      isolate()->native_context()->promise_function(), isolate());
+  DCHECK(constructor->has_initial_map());
+  Handle<Map> map(constructor->initial_map(), isolate());
+
+  DCHECK(!map->is_prototype_map());
+  Handle<JSObject> promise_obj = NewJSObjectFromMap(map);
+  Handle<JSPromise> promise = Handle<JSPromise>::cast(promise_obj);
+  promise->set_status(v8::Promise::kPending);
+  promise->set_flags(0);

[adamk, 2017/03/15 21:36:44]

There are other fields, don't we need to initialize those here?

[gsathya, 2017/03/16 00:59:24]

Those are set to undefined by default which is valid. This is a straight port of
https://cs.chromium.org/chromium/src/v8/src/builtins/builtins-promise.cc?sq=p...

[adamk, 2017/03/16 21:41:23]

Ah, ok. Can you add comments to both places referencing each other to help make
sure they stay in sync?

+  return promise;
+}
 
 Handle<Context> Factory::NewNativeContext() {
   Handle<FixedArray> array =
       NewFixedArray(Context::NATIVE_CONTEXT_SLOTS, TENURED);
   array->set_map_no_write_barrier(*native_context_map());
   Handle<Context> context = Handle<Context>::cast(array);
   context->set_native_context(*context);
   context->set_errors_thrown(Smi::kZero);
   context->set_math_random_index(Smi::kZero);
   Handle<WeakCell> weak_cell = NewWeakCell(context);
@@ skipping 1947 matching lines @@
     Handle<AccessorInfo> prototype =
         Accessors::FunctionPrototypeInfo(isolate(), rw_attribs);
     Descriptor d = Descriptor::AccessorConstant(
         Handle<Name>(Name::cast(prototype->name())), prototype, rw_attribs);
     map->AppendDescriptor(&d);
   }
 }
 
 }  // namespace internal
 }  // namespace v8