[promises] Remove deferred object

src/objects.h

 // Copyright 2015 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 6568 matching lines @@
 };
 
 class JSPromise;
 
 // Struct to hold state required for PromiseReactionJob.
 class PromiseReactionJobInfo : public Struct {
  public:
   DECL_ACCESSORS(promise, JSPromise)
   DECL_ACCESSORS(value, Object)
   DECL_ACCESSORS(tasks, Object)
-  DECL_ACCESSORS(deferred, Object)
+
+  // Check comment in JSPromise for information on what state these
+  // deferred fields could be in.
+  DECL_ACCESSORS(deferred_promise, Object)
+  DECL_ACCESSORS(deferred_on_resolve, Object)
+  DECL_ACCESSORS(deferred_on_reject, Object)
   DECL_ACCESSORS(debug_id, Object)
   DECL_ACCESSORS(debug_name, Object)
   DECL_ACCESSORS(context, Context)
 
   static const int kPromiseOffset = Struct::kHeaderSize;
   static const int kValueOffset = kPromiseOffset + kPointerSize;
   static const int kTasksOffset = kValueOffset + kPointerSize;
-  static const int kDeferredOffset = kTasksOffset + kPointerSize;
-  static const int kDebugIdOffset = kDeferredOffset + kPointerSize;
+  static const int kDeferredPromiseOffset = kTasksOffset + kPointerSize;
+  static const int kDeferredOnResolveOffset =
+      kDeferredPromiseOffset + kPointerSize;
+  static const int kDeferredOnRejectOffset =
+      kDeferredOnResolveOffset + kPointerSize;
+  static const int kDebugIdOffset = kDeferredOnRejectOffset + kPointerSize;
   static const int kDebugNameOffset = kDebugIdOffset + kPointerSize;
   static const int kContextOffset = kDebugNameOffset + kPointerSize;
   static const int kSize = kContextOffset + kPointerSize;
 
   DECLARE_CAST(PromiseReactionJobInfo)
   DECLARE_PRINTER(PromiseReactionJobInfo)
   DECLARE_VERIFIER(PromiseReactionJobInfo)
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PromiseReactionJobInfo);
@@ skipping 2020 matching lines @@
                               kSize> BodyDescriptor;
 };
 
 class JSPromise : public JSObject {
  public:
   DECL_INT_ACCESSORS(status)
   DECL_ACCESSORS(result, Object)
 
   // There are 3 possible states for these fields --
   // 1) Undefined -- This is the zero state when there is no callback
-  // or deferred registered.
+  // or deferred fields registered.
+  //
   // 2) Object -- There is a single Callable directly attached to the
-  // fulfill_reactions, reject_reactions and the deferred JSObject is
-  // directly attached to the deferred field.
+  // fulfill_reactions, reject_reactions and the deferred fields are
+  // directly attached to the slots. In this state, deferred_promise
+  // is a JSReceiver and deferred_on_{resolve, reject} are Callables.
+  //
   // 3) FixedArray -- There is more than one callback and deferred
-  // attached to a FixedArray.
-  DECL_ACCESSORS(deferred, Object)
+  // fields attached to a FixedArray.
+  DECL_ACCESSORS(deferred_promise, Object)
+  DECL_ACCESSORS(deferred_on_resolve, Object)
+  DECL_ACCESSORS(deferred_on_reject, Object)
   DECL_ACCESSORS(fulfill_reactions, Object)
   DECL_ACCESSORS(reject_reactions, Object)
 
   DECL_INT_ACCESSORS(flags)
 
   // [has_handler]: Whether this promise has a reject handler or not.
   DECL_BOOLEAN_ACCESSORS(has_handler)
 
   // [handled_hint]: Whether this promise will be handled by a catch
   // block in an async function.
   DECL_BOOLEAN_ACCESSORS(handled_hint)
 
   static const char* Status(int status);
 
   DECLARE_CAST(JSPromise)
 
   // Dispatched behavior.
   DECLARE_PRINTER(JSPromise)
   DECLARE_VERIFIER(JSPromise)
 
   // Layout description.
   static const int kStatusOffset = JSObject::kHeaderSize;
   static const int kResultOffset = kStatusOffset + kPointerSize;
-  static const int kDeferredOffset = kResultOffset + kPointerSize;
-  static const int kFulfillReactionsOffset = kDeferredOffset + kPointerSize;
+  static const int kDeferredPromiseOffset = kResultOffset + kPointerSize;
+  static const int kDeferredOnResolveOffset =
+      kDeferredPromiseOffset + kPointerSize;
+  static const int kDeferredOnRejectOffset =
+      kDeferredOnResolveOffset + kPointerSize;
+  static const int kFulfillReactionsOffset =
+      kDeferredOnRejectOffset + kPointerSize;
   static const int kRejectReactionsOffset =
       kFulfillReactionsOffset + kPointerSize;
   static const int kFlagsOffset = kRejectReactionsOffset + kPointerSize;
   static const int kSize = kFlagsOffset + kPointerSize;
 
   // Flags layout.
   static const int kHasHandlerBit = 0;
   static const int kHandledHintBit = 1;
 };
 
@@ skipping 3020 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_