WIP [esnext] implement async iteration proposal

src/builtins/builtins.h

 // Copyright 2011 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_BUILTINS_BUILTINS_H_
 #define V8_BUILTINS_BUILTINS_H_
 
 #include "src/base/flags.h"
 #include "src/handles.h"
 
@@ skipping 749 matching lines @@
   TFJ(TypedArrayPrototypeByteLength, 0)                                        \
   /* ES6 section 22.2.3.3 get %TypedArray%.prototype.byteOffset */             \
   TFJ(TypedArrayPrototypeByteOffset, 0)                                        \
   /* ES6 section 22.2.3.18 get %TypedArray%.prototype.length */                \
   TFJ(TypedArrayPrototypeLength, 0)                                            \
   /* ES6 #sec-%typedarray%.prototype.entries */                                \
   TFJ(TypedArrayPrototypeEntries, 0)                                           \
   /* ES6 #sec-%typedarray%.prototype.keys */                                   \
   TFJ(TypedArrayPrototypeKeys, 0)                                              \
   /* ES6 #sec-%typedarray%.prototype.values */                                 \
-  TFJ(TypedArrayPrototypeValues, 0)
+  TFJ(TypedArrayPrototypeValues, 0)                                            \
+                                                                               \
+  /* AsyncGenerator builtins */                                                \
+                                                                               \
+  /* AsyncGeneratorFunction( p1, p2, ... pn, body ) */                         \
+  /* proposal-async-iteration/#sec-asyncgeneratorfunction-constructor */       \
+  CPP(AsyncGeneratorFunctionConstructor)                                       \
+  /* AsyncGenerator.prototype.next ( value ) */                                \
+  /* proposal-async-iteration/#sec-asyncgenerator-prototype-next */            \
+  TFJ(AsyncGeneratorPrototypeNext, 1)                                          \
+  /* AsyncGenerator.prototype.return ( value ) */                              \
+  /* proposal-async-iteration/#sec-asyncgenerator-prototype-return */          \
+  TFJ(AsyncGeneratorPrototypeReturn, 1)                                        \
+  /* AsyncGenerator.prototype.throw ( exception ) */                           \
+  /* proposal-async-iteration/#sec-asyncgenerator-prototype-throw */           \
+  TFJ(AsyncGeneratorPrototypeThrow, 1)                                         \
+                                                                               \
+  /* Await (proposal-async-iteration/#await), with resume behaviour */         \
+  /* specific to Async Generators. Internal / Not exposed to JS code. */       \
+  TFJ(AsyncGeneratorAwaitCaught, 2)                                            \
+  TFJ(AsyncGeneratorAwaitUncaught, 2)                                          \
+  TFJ(AsyncGeneratorAwaitResolveClosure, 1)                                    \
+  TFJ(AsyncGeneratorAwaitRejectClosure, 1)                                     \
+                                                                               \
+  /* GeneratorYield (proposal-async-iteration/#sec-generatoryield) with */     \
+  /* resume behaviour specific to Async Generators. Internal / not exposed */  \
+  /* to JS code. */                                                            \
+  TFJ(AsyncGeneratorYield, 1)                                                  \
+                                                                               \
+  /* Async-from-Sync Iterator builtins */                                      \
+                                                                               \
+  /* %AsyncFromSyncIteratorPrototype% */                                       \
+  /* (proposal-async-iteration/#sec-%asyncfromsynciteratorprototype%-object)*/ \
+  TFJ(AsyncFromSyncIteratorPrototypeNext, 1)                                   \
+  TFJ(AsyncFromSyncIteratorPrototypeThrow, 1)                                  \
+  TFJ(AsyncFromSyncIteratorPrototypeReturn, 1)                                 \
+                                                                               \
+  /* proposal-async-iteration/#sec-async-iterator-value-unwrap-functions */    \
+  TFJ(AsyncIteratorValueUnwrap, 1)
 
 #define IGNORE_BUILTIN(...)
 
 #define BUILTIN_LIST_ALL(V) BUILTIN_LIST(V, V, V, V, V, V, V)
 
 #define BUILTIN_LIST_C(V)                                            \
   BUILTIN_LIST(V, V, IGNORE_BUILTIN, IGNORE_BUILTIN, IGNORE_BUILTIN, \
                IGNORE_BUILTIN, IGNORE_BUILTIN)
 
 #define BUILTIN_LIST_A(V)                                                      \
@@ skipping 132 matching lines @@
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_BUILTINS_H_