[generators] Decouple generator resume from fullcodegen.

src/js/generator.js

-// Copyright 2013 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.
-
-(function(global, utils) {
-
-"use strict";
-
-%CheckIsBootstrapping();
-
-// -------------------------------------------------------------------
-// Imports
-
-var GeneratorFunctionPrototype = utils.ImportNow("GeneratorFunctionPrototype");
-var GeneratorFunction = utils.ImportNow("GeneratorFunction");
-var GlobalFunction = global.Function;
-var MakeTypeError;
-var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
-
-utils.Import(function(from) {
-  MakeTypeError = from.MakeTypeError;
-});
-
-// ----------------------------------------------------------------------------
-
-// Generator functions and objects are specified by ES6, sections 15.19.3 and
-// 15.19.4.
-
-function GeneratorObjectNext(value) {
-  if (!IS_GENERATOR(this)) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        '[Generator].prototype.next', this);
-  }
-
-  var continuation = %GeneratorGetContinuation(this);
-  if (continuation > 0) {
-    // Generator is suspended.
-    DEBUG_PREPARE_STEP_IN_IF_STEPPING(this);
-    return %_GeneratorNext(this, value);
-  } else if (continuation == 0) {
-    // Generator is already closed.
-    return %_CreateIterResultObject(UNDEFINED, true);
-  } else {
-    // Generator is running.
-    throw MakeTypeError(kGeneratorRunning);
-  }
-}
-
-
-function GeneratorObjectReturn(value) {
-  if (!IS_GENERATOR(this)) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        '[Generator].prototype.return', this);
-  }
-
-  var continuation = %GeneratorGetContinuation(this);
-  if (continuation > 0) {
-    // Generator is suspended.
-    DEBUG_PREPARE_STEP_IN_IF_STEPPING(this);
-    return %_GeneratorReturn(this, value);
-  } else if (continuation == 0) {
-    // Generator is already closed.
-    return %_CreateIterResultObject(value, true);
-  } else {
-    // Generator is running.
-    throw MakeTypeError(kGeneratorRunning);
-  }
-}
-
-
-function GeneratorObjectThrow(exn) {
-  if (!IS_GENERATOR(this)) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        '[Generator].prototype.throw', this);
-  }
-
-  var continuation = %GeneratorGetContinuation(this);
-  if (continuation > 0) {
-    // Generator is suspended.
-    DEBUG_PREPARE_STEP_IN_IF_STEPPING(this);
-    return %_GeneratorThrow(this, exn);
-  } else if (continuation == 0) {
-    // Generator is already closed.
-    throw exn;
-  } else {
-    // Generator is running.
-    throw MakeTypeError(kGeneratorRunning);
-  }
-}
-
-// ----------------------------------------------------------------------------
-
-// None of the three resume operations (Runtime_GeneratorNext,
-// Runtime_GeneratorReturn, Runtime_GeneratorThrow) is supported by
-// Crankshaft or TurboFan.  Disable optimization of wrappers here.
-%NeverOptimizeFunction(GeneratorObjectNext);
-%NeverOptimizeFunction(GeneratorObjectReturn);
-%NeverOptimizeFunction(GeneratorObjectThrow);
-
-// Set up non-enumerable functions on the generator prototype object.
-var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
-utils.InstallFunctions(GeneratorObjectPrototype,
-                       DONT_ENUM,
-                      ["next", GeneratorObjectNext,
-                       "return", GeneratorObjectReturn,
-                       "throw", GeneratorObjectThrow]);
-
-%AddNamedProperty(GeneratorObjectPrototype, "constructor",
-    GeneratorFunctionPrototype, DONT_ENUM | READ_ONLY);
-%AddNamedProperty(GeneratorObjectPrototype,
-    toStringTagSymbol, "Generator", DONT_ENUM | READ_ONLY);
-%InternalSetPrototype(GeneratorFunctionPrototype, GlobalFunction.prototype);
-%AddNamedProperty(GeneratorFunctionPrototype,
-    toStringTagSymbol, "GeneratorFunction", DONT_ENUM | READ_ONLY);
-%AddNamedProperty(GeneratorFunctionPrototype, "constructor",
-    GeneratorFunction, DONT_ENUM | READ_ONLY);
-%InternalSetPrototype(GeneratorFunction, GlobalFunction);
-
-})