| // 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); |
| |
| }) |