WIP [esnext] implement async iteration proposal

src/globals.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_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1079 matching lines @@
   kGetterFunction = 1 << 6,
   kSetterFunction = 1 << 7,
   kAsyncFunction = 1 << 8,
   kModule = 1 << 9,
   kAccessorFunction = kGetterFunction | kSetterFunction,
   kDefaultBaseConstructor = kDefaultConstructor | kBaseConstructor,
   kDefaultDerivedConstructor = kDefaultConstructor | kDerivedConstructor,
   kClassConstructor =
       kBaseConstructor | kDerivedConstructor | kDefaultConstructor,
   kAsyncArrowFunction = kArrowFunction | kAsyncFunction,
-  kAsyncConciseMethod = kAsyncFunction | kConciseMethod
+  kAsyncConciseMethod = kAsyncFunction | kConciseMethod,
+
+  // https://tc39.github.io/proposal-async-iteration/
+  kAsyncConciseGeneratorMethod = kAsyncFunction | kConciseGeneratorMethod,
+  kAsyncGeneratorFunction = kAsyncFunction | kGeneratorFunction,
 };
 
 inline bool IsValidFunctionKind(FunctionKind kind) {
   return kind == FunctionKind::kNormalFunction ||
          kind == FunctionKind::kArrowFunction ||
          kind == FunctionKind::kGeneratorFunction ||
          kind == FunctionKind::kModule ||
          kind == FunctionKind::kConciseMethod ||
          kind == FunctionKind::kConciseGeneratorMethod ||
          kind == FunctionKind::kGetterFunction ||
          kind == FunctionKind::kSetterFunction ||
          kind == FunctionKind::kAccessorFunction ||
          kind == FunctionKind::kDefaultBaseConstructor ||
          kind == FunctionKind::kDefaultDerivedConstructor ||
          kind == FunctionKind::kBaseConstructor ||
          kind == FunctionKind::kDerivedConstructor ||
          kind == FunctionKind::kAsyncFunction ||
          kind == FunctionKind::kAsyncArrowFunction ||
-         kind == FunctionKind::kAsyncConciseMethod;
+         kind == FunctionKind::kAsyncConciseMethod ||
+         kind == FunctionKind::kAsyncConciseGeneratorMethod ||
+         kind == FunctionKind::kAsyncGeneratorFunction;
 }
 
 
 inline bool IsArrowFunction(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kArrowFunction;
 }
 
 
 inline bool IsGeneratorFunction(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kGeneratorFunction;
 }
 
 inline bool IsModule(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kModule;
 }
 
 inline bool IsAsyncFunction(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kAsyncFunction;
 }
 
+inline bool IsAsyncGeneratorFunction(FunctionKind kind) {
+  DCHECK(IsValidFunctionKind(kind));
+  const FunctionKind kMask = FunctionKind::kAsyncGeneratorFunction;
+  return (kind & kMask) == kMask;
+}
+
 inline bool IsResumableFunction(FunctionKind kind) {
   return IsGeneratorFunction(kind) || IsAsyncFunction(kind) || IsModule(kind);
 }
 
 inline bool IsConciseMethod(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kConciseMethod;
 }
 
 inline bool IsGetterFunction(FunctionKind kind) {
@@ skipping 171 matching lines @@
 }  // namespace internal
 }  // namespace v8
 
 // Used by js-builtin-reducer to identify whether ReduceArrayIterator() is
 // reducing a JSArray method, or a JSTypedArray method.
 enum class ArrayIteratorKind { kArray, kTypedArray };
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_