[promises] port NewPromiseCapability to TF

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 404 matching lines @@
   V(JS_ARRAY_TYPE)                                              \
   V(JS_ARRAY_BUFFER_TYPE)                                       \
   V(JS_TYPED_ARRAY_TYPE)                                        \
   V(JS_DATA_VIEW_TYPE)                                          \
   V(JS_SET_TYPE)                                                \
   V(JS_MAP_TYPE)                                                \
   V(JS_SET_ITERATOR_TYPE)                                       \
   V(JS_MAP_ITERATOR_TYPE)                                       \
   V(JS_WEAK_MAP_TYPE)                                           \
   V(JS_WEAK_SET_TYPE)                                           \
+  V(JS_PROMISE_CAPABILITY_TYPE)                                 \
   V(JS_PROMISE_TYPE)                                            \
   V(JS_REGEXP_TYPE)                                             \
   V(JS_ERROR_TYPE)                                              \
   V(JS_STRING_ITERATOR_TYPE)                                    \
                                                                 \
   V(JS_TYPED_ARRAY_KEY_ITERATOR_TYPE)                           \
   V(JS_FAST_ARRAY_KEY_ITERATOR_TYPE)                            \
   V(JS_GENERIC_ARRAY_KEY_ITERATOR_TYPE)                         \
                                                                 \
   V(JS_UINT8_ARRAY_KEY_VALUE_ITERATOR_TYPE)                     \
@@ skipping 325 matching lines @@
   JS_ARRAY_TYPE,
   JS_ARRAY_BUFFER_TYPE,
   JS_TYPED_ARRAY_TYPE,
   JS_DATA_VIEW_TYPE,
   JS_SET_TYPE,
   JS_MAP_TYPE,
   JS_SET_ITERATOR_TYPE,
   JS_MAP_ITERATOR_TYPE,
   JS_WEAK_MAP_TYPE,
   JS_WEAK_SET_TYPE,
+  JS_PROMISE_CAPABILITY_TYPE,
   JS_PROMISE_TYPE,
   JS_REGEXP_TYPE,
   JS_ERROR_TYPE,
   JS_STRING_ITERATOR_TYPE,
 
   JS_TYPED_ARRAY_KEY_ITERATOR_TYPE,
   JS_FAST_ARRAY_KEY_ITERATOR_TYPE,
   JS_GENERIC_ARRAY_KEY_ITERATOR_TYPE,
 
   JS_UINT8_ARRAY_KEY_VALUE_ITERATOR_TYPE,
@@ skipping 302 matching lines @@
   V(Boolean)                     \
   V(JSArray)                     \
   V(JSArrayBuffer)               \
   V(JSArrayBufferView)           \
   V(JSCollection)                \
   V(JSTypedArray)                \
   V(JSArrayIterator)             \
   V(JSDataView)                  \
   V(JSProxy)                     \
   V(JSError)                     \
+  V(JSPromiseCapability)         \
   V(JSPromise)                   \
   V(JSStringIterator)            \
   V(JSSet)                       \
   V(JSMap)                       \
   V(JSSetIterator)               \
   V(JSMapIterator)               \
   V(JSWeakCollection)            \
   V(JSWeakMap)                   \
   V(JSWeakSet)                   \
   V(JSRegExp)                    \
@@ skipping 7529 matching lines @@
   static const int kStartPositionOffset = kStackFramesOffset + kPointerSize;
   static const int kEndPositionOffset = kStartPositionOffset + kPointerSize;
   static const int kErrorLevelOffset = kEndPositionOffset + kPointerSize;
   static const int kSize = kErrorLevelOffset + kPointerSize;
 
   typedef FixedBodyDescriptor<HeapObject::kMapOffset,
                               kStackFramesOffset + kPointerSize,
                               kSize> BodyDescriptor;
 };
 
+class JSPromise;
+
+// TODO(caitp): Make this a Struct once properties are no longer accessed from
+// JS
+class JSPromiseCapability : public JSObject {
+ public:
+  DECLARE_CAST(JSPromiseCapability)
+
+  DECLARE_VERIFIER(JSPromiseCapability)
+
+  DECL_ACCESSORS(promise, Object)
+  DECL_ACCESSORS(resolve, Object)
+  DECL_ACCESSORS(reject, Object)
+
+  static const int kPromiseOffset = JSObject::kHeaderSize;
+  static const int kResolveOffset = kPromiseOffset + kPointerSize;
+  static const int kRejectOffset = kResolveOffset + kPointerSize;
+  static const int kSize = kRejectOffset + kPointerSize;
+
+  enum InObjectPropertyIndex {
+    kPromiseIndex,
+    kResolveIndex,
+    kRejectIndex,
+    kInObjectPropertyCount  // Dummy.
+  };
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(JSPromiseCapability);
+};
+
 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 fields registered.
   //
   // 2) Object -- There is a single Callable directly attached to the
@@ skipping 3069 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_