Desugar async/await to create the resulting Promise upfront

src/contexts.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.
 
 #ifndef V8_CONTEXTS_H_
 #define V8_CONTEXTS_H_
 
 #include "src/heap/heap.h"
 #include "src/objects.h"
 
@@ skipping 41 matching lines @@
   V(OBJECT_KEYS, JSFunction, object_keys)                               \
   V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply)                     \
   V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct)             \
   V(REFLECT_DEFINE_PROPERTY_INDEX, JSFunction, reflect_define_property) \
   V(REFLECT_DELETE_PROPERTY_INDEX, JSFunction, reflect_delete_property) \
   V(SPREAD_ARGUMENTS_INDEX, JSFunction, spread_arguments)               \
   V(SPREAD_ITERABLE_INDEX, JSFunction, spread_iterable)                 \
   V(MATH_FLOOR_INDEX, JSFunction, math_floor)                           \
   V(MATH_POW_INDEX, JSFunction, math_pow)
 
-#define NATIVE_CONTEXT_IMPORTED_FIELDS(V)                                   \
-  V(ARRAY_CONCAT_INDEX, JSFunction, array_concat)                           \
-  V(ARRAY_POP_INDEX, JSFunction, array_pop)                                 \
-  V(ARRAY_PUSH_INDEX, JSFunction, array_push)                               \
-  V(ARRAY_SHIFT_INDEX, JSFunction, array_shift)                             \
-  V(ARRAY_SPLICE_INDEX, JSFunction, array_splice)                           \
-  V(ARRAY_SLICE_INDEX, JSFunction, array_slice)                             \
-  V(ARRAY_UNSHIFT_INDEX, JSFunction, array_unshift)                         \
-  V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator)         \
-  V(ASYNC_FUNCTION_AWAIT_INDEX, JSFunction, async_function_await)           \
-  V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap)                   \
-  V(ERROR_FUNCTION_INDEX, JSFunction, error_function)                       \
-  V(ERROR_TO_STRING, JSFunction, error_to_string)                           \
-  V(EVAL_ERROR_FUNCTION_INDEX, JSFunction, eval_error_function)             \
-  V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun)                     \
-  V(MAP_DELETE_METHOD_INDEX, JSFunction, map_delete)                        \
-  V(MAP_GET_METHOD_INDEX, JSFunction, map_get)                              \
-  V(MAP_HAS_METHOD_INDEX, JSFunction, map_has)                              \
-  V(MAP_SET_METHOD_INDEX, JSFunction, map_set)                              \
-  V(OBJECT_VALUE_OF, JSFunction, object_value_of)                           \
-  V(OBJECT_TO_STRING, JSFunction, object_to_string)                         \
-  V(PROMISE_CATCH_INDEX, JSFunction, promise_catch)                         \
-  V(PROMISE_CREATE_INDEX, JSFunction, promise_create)                       \
-  V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function)                   \
-  V(PROMISE_HAS_USER_DEFINED_REJECT_HANDLER_INDEX, JSFunction,              \
-    promise_has_user_defined_reject_handler)                                \
-  V(PROMISE_REJECT_INDEX, JSFunction, promise_reject)                       \
-  V(PROMISE_RESOLVE_INDEX, JSFunction, promise_resolve)                     \
-  V(PROMISE_CREATE_RESOLVED_INDEX, JSFunction, promise_create_resolved)     \
-  V(PROMISE_CREATE_REJECTED_INDEX, JSFunction, promise_create_rejected)     \
-  V(PROMISE_THEN_INDEX, JSFunction, promise_then)                           \
-  V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function)           \
-  V(REFERENCE_ERROR_FUNCTION_INDEX, JSFunction, reference_error_function)   \
-  V(SET_ADD_METHOD_INDEX, JSFunction, set_add)                              \
-  V(SET_DELETE_METHOD_INDEX, JSFunction, set_delete)                        \
-  V(SET_HAS_METHOD_INDEX, JSFunction, set_has)                              \
-  V(SYNTAX_ERROR_FUNCTION_INDEX, JSFunction, syntax_error_function)         \
-  V(TYPE_ERROR_FUNCTION_INDEX, JSFunction, type_error_function)             \
+#define NATIVE_CONTEXT_IMPORTED_FIELDS(V)                                 \
+  V(ARRAY_CONCAT_INDEX, JSFunction, array_concat)                         \
+  V(ARRAY_POP_INDEX, JSFunction, array_pop)                               \
+  V(ARRAY_PUSH_INDEX, JSFunction, array_push)                             \
+  V(ARRAY_SHIFT_INDEX, JSFunction, array_shift)                           \
+  V(ARRAY_SPLICE_INDEX, JSFunction, array_splice)                         \
+  V(ARRAY_SLICE_INDEX, JSFunction, array_slice)                           \
+  V(ARRAY_UNSHIFT_INDEX, JSFunction, array_unshift)                       \
+  V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator)       \
+  V(ASYNC_FUNCTION_AWAIT_INDEX, JSFunction, async_function_await)         \
+  V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap)                 \
+  V(ERROR_FUNCTION_INDEX, JSFunction, error_function)                     \
+  V(ERROR_TO_STRING, JSFunction, error_to_string)                         \
+  V(EVAL_ERROR_FUNCTION_INDEX, JSFunction, eval_error_function)           \
+  V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun)                   \
+  V(MAP_DELETE_METHOD_INDEX, JSFunction, map_delete)                      \
+  V(MAP_GET_METHOD_INDEX, JSFunction, map_get)                            \
+  V(MAP_HAS_METHOD_INDEX, JSFunction, map_has)                            \
+  V(MAP_SET_METHOD_INDEX, JSFunction, map_set)                            \
+  V(OBJECT_VALUE_OF, JSFunction, object_value_of)                         \
+  V(OBJECT_TO_STRING, JSFunction, object_to_string)                       \
+  V(PROMISE_CATCH_INDEX, JSFunction, promise_catch)                       \
+  V(PROMISE_CREATE_INDEX, JSFunction, promise_create)                     \
+  V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function)                 \
+  V(PROMISE_HAS_USER_DEFINED_REJECT_HANDLER_INDEX, JSFunction,            \
+    promise_has_user_defined_reject_handler)                              \
+  V(PROMISE_REJECT_INDEX, JSFunction, promise_reject)                     \
+  V(PROMISE_RESOLVE_INDEX, JSFunction, promise_resolve)                   \
+  V(PROMISE_THEN_INDEX, JSFunction, promise_then)                         \
+  V(RANGE_ERROR_FUNCTION_INDEX, JSFunction, range_error_function)         \
+  V(REJECT_PROMISE_NO_DEBUG_EVENT_INDEX, JSFunction,                      \
+    reject_promise_no_debug_event)                                        \
+  V(REFERENCE_ERROR_FUNCTION_INDEX, JSFunction, reference_error_function) \
+  V(SET_ADD_METHOD_INDEX, JSFunction, set_add)                            \
+  V(SET_DELETE_METHOD_INDEX, JSFunction, set_delete)                      \
+  V(SET_HAS_METHOD_INDEX, JSFunction, set_has)                            \
+  V(SYNTAX_ERROR_FUNCTION_INDEX, JSFunction, syntax_error_function)       \
+  V(TYPE_ERROR_FUNCTION_INDEX, JSFunction, type_error_function)           \
   V(URI_ERROR_FUNCTION_INDEX, JSFunction, uri_error_function)
 
 #define NATIVE_CONTEXT_FIELDS(V)                                               \
   V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object)                         \
   V(EMBEDDER_DATA_INDEX, FixedArray, embedder_data)                            \
   /* Below is alpha-sorted */                                                  \
   V(ACCESSOR_PROPERTY_DESCRIPTOR_MAP_INDEX, Map,                               \
     accessor_property_descriptor_map)                                          \
   V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings)    \
   V(ARRAY_BUFFER_FUN_INDEX, JSFunction, array_buffer_fun)                      \
@@ skipping 420 matching lines @@
 #endif
 
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CONTEXTS_H_