[promises] Move PromiseResolveThenableJob to c++

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 376 matching lines @@
   V(FUNCTION_TEMPLATE_INFO_TYPE)                                \
   V(OBJECT_TEMPLATE_INFO_TYPE)                                  \
   V(SIGNATURE_INFO_TYPE)                                        \
   V(TYPE_SWITCH_INFO_TYPE)                                      \
   V(ALLOCATION_MEMENTO_TYPE)                                    \
   V(ALLOCATION_SITE_TYPE)                                       \
   V(SCRIPT_TYPE)                                                \
   V(TYPE_FEEDBACK_INFO_TYPE)                                    \
   V(ALIASED_ARGUMENTS_ENTRY_TYPE)                               \
   V(BOX_TYPE)                                                   \
+  V(PROMISE_CONTAINER_TYPE)                                     \
   V(PROTOTYPE_INFO_TYPE)                                        \
   V(SLOPPY_BLOCK_WITH_EVAL_CONTEXT_EXTENSION_TYPE)              \
                                                                 \
   V(FIXED_ARRAY_TYPE)                                           \
   V(FIXED_DOUBLE_ARRAY_TYPE)                                    \
   V(SHARED_FUNCTION_INFO_TYPE)                                  \
   V(WEAK_CELL_TYPE)                                             \
   V(TRANSITION_ARRAY_TYPE)                                      \
                                                                 \
   V(JS_MESSAGE_OBJECT_TYPE)                                     \
@@ skipping 84 matching lines @@
 // object type in this causes the compiler to generate most of the boilerplate
 // code for the class including allocation and garbage collection routines,
 // casts and predicates.  All you need to define is the class, methods and
 // object verification routines.  Easy, no?
 //
 // Note that for subtle reasons related to the ordering or numerical values of
 // type tags, elements in this list have to be added to the INSTANCE_TYPE_LIST
 // manually.
 #define STRUCT_LIST(V)                                                       \
   V(BOX, Box, box)                                                           \
+  V(PROMISE_CONTAINER, PromiseContainer, promise_container)                  \
   V(ACCESSOR_INFO, AccessorInfo, accessor_info)                              \
   V(ACCESSOR_PAIR, AccessorPair, accessor_pair)                              \
   V(ACCESS_CHECK_INFO, AccessCheckInfo, access_check_info)                   \
   V(INTERCEPTOR_INFO, InterceptorInfo, interceptor_info)                     \
   V(CALL_HANDLER_INFO, CallHandlerInfo, call_handler_info)                   \
   V(FUNCTION_TEMPLATE_INFO, FunctionTemplateInfo, function_template_info)    \
   V(OBJECT_TEMPLATE_INFO, ObjectTemplateInfo, object_template_info)          \
   V(SCRIPT, Script, script)                                                  \
   V(ALLOCATION_SITE, AllocationSite, allocation_site)                        \
   V(ALLOCATION_MEMENTO, AllocationMemento, allocation_memento)               \
@@ skipping 162 matching lines @@
   FUNCTION_TEMPLATE_INFO_TYPE,
   OBJECT_TEMPLATE_INFO_TYPE,
   SIGNATURE_INFO_TYPE,
   TYPE_SWITCH_INFO_TYPE,
   ALLOCATION_SITE_TYPE,
   ALLOCATION_MEMENTO_TYPE,
   SCRIPT_TYPE,
   TYPE_FEEDBACK_INFO_TYPE,
   ALIASED_ARGUMENTS_ENTRY_TYPE,
   BOX_TYPE,
+  PROMISE_CONTAINER_TYPE,
   DEBUG_INFO_TYPE,
   BREAK_POINT_INFO_TYPE,
   FIXED_ARRAY_TYPE,
   SHARED_FUNCTION_INFO_TYPE,
   CELL_TYPE,
   WEAK_CELL_TYPE,
   TRANSITION_ARRAY_TYPE,
   PROPERTY_CELL_TYPE,
   PROTOTYPE_INFO_TYPE,
   SLOPPY_BLOCK_WITH_EVAL_CONTEXT_EXTENSION_TYPE,
@@ skipping 5876 matching lines @@
 
 // An abstract superclass, a marker class really, for simple structure classes.
 // It doesn't carry much functionality but allows struct classes to be
 // identified in the type system.
 class Struct: public HeapObject {
  public:
   inline void InitializeBody(int object_size);
   DECLARE_CAST(Struct)
 };
 
+class PromiseContainer : public Struct {

[adamk, 2016/09/06 21:04:57]

Please add a class comment explaining what this is for.

[gsathya, 2016/09/07 04:45:30]

Done.

+ public:
+  DECL_ACCESSORS(promise, Object)

[adamk, 2016/09/06 21:04:57]

Do we not have any more specific type for promise?

[gsathya, 2016/09/07 04:45:30]

Nope, we only have an instance type of JS_PROMISE_TYPE which gets tacked on to
the promise constructor in the bootstrapper. But no concrete promise class.

+  DECL_ACCESSORS(thenable, Object)
+  DECL_ACCESSORS(then, JSFunction)
+  DECL_ACCESSORS(resolve, JSFunction)
+  DECL_ACCESSORS(reject, JSFunction)
+
+  static const int kPromiseOffset = Struct::kHeaderSize;
+  static const int kThenableOffset = kPromiseOffset + kPointerSize;
+  static const int kThenOffset = kThenableOffset + kPointerSize;
+  static const int kResolveOffset = kThenOffset + kPointerSize;
+  static const int kRejectOffset = kResolveOffset + kPointerSize;
+  static const int kSize = kRejectOffset + kPointerSize;
+
+  DECLARE_CAST(PromiseContainer)
+  DECLARE_PRINTER(PromiseContainer)
+  DECLARE_VERIFIER(PromiseContainer)
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(PromiseContainer);
+};
 
 // A simple one-element struct, useful where smis need to be boxed.
 class Box : public Struct {
  public:
   // [value]: the boxed contents.
   DECL_ACCESSORS(value, Object)
 
   DECLARE_CAST(Box)
 
   // Dispatched behavior.
@@ skipping 4612 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_