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 101 matching lines @@
   TFS(FastCloneShallowObject5, BUILTIN, kNoExtraICState,                       \
       FastCloneShallowObject)                                                  \
   TFS(FastCloneShallowObject6, BUILTIN, kNoExtraICState,                       \
       FastCloneShallowObject)                                                  \
                                                                                \
   /* Apply and entries */                                                      \
   ASM(Apply)                                                                   \
   ASM(JSEntryTrampoline)                                                       \
   ASM(JSConstructEntryTrampoline)                                              \
   ASM(ResumeGeneratorTrampoline)                                               \
+  ASM(ResumeAwaitedGeneratorTrampoline)                                        \
                                                                                \
   /* Stack and interrupt check */                                              \
   ASM(InterruptCheck)                                                          \
   ASM(StackCheck)                                                              \
                                                                                \
   /* String helpers */                                                         \
   TFS(StringEqual, BUILTIN, kNoExtraICState, Compare)                          \
   TFS(StringNotEqual, BUILTIN, kNoExtraICState, Compare)                       \
   TFS(StringLessThan, BUILTIN, kNoExtraICState, Compare)                       \
   TFS(StringLessThanOrEqual, BUILTIN, kNoExtraICState, Compare)                \
@@ skipping 632 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)                                                  \
+  TFJ(AsyncGeneratorRawYield, 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 103 matching lines @@
   static void Generate_Call(MacroAssembler* masm, ConvertReceiverMode mode,
                             TailCallMode tail_call_mode);
 
   static void Generate_InterpreterPushArgsAndCallImpl(
       MacroAssembler* masm, TailCallMode tail_call_mode,
       CallableType function_type);
 
   static void Generate_InterpreterPushArgsAndConstructImpl(
       MacroAssembler* masm, CallableType function_type);
 
+  enum class ResumeGeneratorType {
+    kYield,  // Resume generator after Yield
+    kAwait   // Resume async generator after Await
+  };
+  static void Generate_ResumeGenerator(MacroAssembler* masm,
+                                       ResumeGeneratorType type);
+
   enum class MathMaxMinKind { kMax, kMin };
   static void Generate_MathMaxMin(MacroAssembler* masm, MathMaxMinKind kind);
 
 #define DECLARE_ASM(Name, ...) \
   static void Generate_##Name(MacroAssembler* masm);
 #define DECLARE_TF(Name, ...) \
   static void Generate_##Name(compiler::CodeAssemblerState* state);
 
   BUILTIN_LIST(IGNORE_BUILTIN, IGNORE_BUILTIN, DECLARE_TF, DECLARE_TF,
                DECLARE_ASM, DECLARE_ASM, DECLARE_ASM)
 
 #undef DECLARE_ASM
 #undef DECLARE_TF
 
   // Note: These are always Code objects, but to conform with
   // IterateBuiltins() above which assumes Object**'s for the callback
   // function f, we use an Object* array here.
   Object* builtins_[builtin_count];
   bool initialized_;
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_BUILTINS_H_