[esnext] prototype runtime implementation for async functions

src/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_H_
 #define V8_BUILTINS_H_
 
 #include "src/base/flags.h"
 #include "src/handles.h"
 
@@ skipping 285 matching lines @@
   V(MarkCodeAsToBeExecutedOnce, BUILTIN, UNINITIALIZED, kNoExtraICState)       \
   V(MarkCodeAsExecutedOnce, BUILTIN, UNINITIALIZED, kNoExtraICState)           \
   V(MarkCodeAsExecutedTwice, BUILTIN, UNINITIALIZED, kNoExtraICState)          \
   CODE_AGE_LIST_WITH_ARG(DECLARE_CODE_AGE_BUILTIN, V)
 
 // Define list of builtins implemented in TurboFan (with JS linkage).
 #define BUILTIN_LIST_T(V)         \
   V(GeneratorPrototypeNext, 2)    \
   V(GeneratorPrototypeReturn, 2)  \
   V(GeneratorPrototypeThrow, 2)   \
+  V(AsyncFunctionNext, 2)         \
+  V(AsyncFunctionThrow, 2)        \
   V(MathCeil, 2)                  \
   V(MathClz32, 2)                 \
   V(MathFloor, 2)                 \
   V(MathRound, 2)                 \
   V(MathSqrt, 2)                  \
   V(MathTrunc, 2)                 \
   V(ObjectHasOwnProperty, 2)      \
   V(StringPrototypeCharAt, 2)     \
   V(StringPrototypeCharCodeAt, 2) \
   V(AtomicsLoadCheck, 3)
@@ skipping 298 matching lines @@
   // ES6 section 20.1.1.1 Number ( [ value ] ) for the [[Construct]] case.
   static void Generate_NumberConstructor_ConstructStub(MacroAssembler* masm);
 
   // ES6 section 25.3.1.2 Generator.prototype.next ( value )
   static void Generate_GeneratorPrototypeNext(CodeStubAssembler* assembler);
   // ES6 section 25.3.1.3 Generator.prototype.return ( value )
   static void Generate_GeneratorPrototypeReturn(CodeStubAssembler* assembler);
   // ES6 section 25.3.1.4 Generator.prototype.throw ( exception )
   static void Generate_GeneratorPrototypeThrow(CodeStubAssembler* assembler);
 
+  static void Generate_AsyncFunctionNext(CodeStubAssembler* assembler);
+  static void Generate_AsyncFunctionThrow(CodeStubAssembler* assembler);
+
   // ES6 section 19.1.3.2 Object.prototype.hasOwnProperty
   static void Generate_ObjectHasOwnProperty(CodeStubAssembler* assembler);
 
   // ES6 section 21.1.3.1 String.prototype.charAt ( pos )
   static void Generate_StringPrototypeCharAt(CodeStubAssembler* assembler);
   // ES6 section 21.1.3.2 String.prototype.charCodeAt ( pos )
   static void Generate_StringPrototypeCharCodeAt(CodeStubAssembler* assembler);
 
   static void Generate_StringConstructor(MacroAssembler* masm);
   static void Generate_StringConstructor_ConstructStub(MacroAssembler* masm);
@@ skipping 39 matching lines @@
   friend class BuiltinFunctionTable;
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_H_