| // 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. |
| |
| "use strict"; |
| |
| // This file relies on the fact that the following declarations have been made |
| // in runtime.js: |
| // var $Function = global.Function; |
| |
| // ---------------------------------------------------------------------------- |
| |
| |
| // 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('incompatible_method_receiver', |
| ['[Generator].prototype.next', this]); |
| } |
| |
| return %_GeneratorNext(this, value); |
| } |
| |
| function GeneratorObjectThrow(exn) { |
| if (!IS_GENERATOR(this)) { |
| throw MakeTypeError('incompatible_method_receiver', |
| ['[Generator].prototype.throw', this]); |
| } |
| |
| return %_GeneratorThrow(this, exn); |
| } |
| |
| function GeneratorObjectIterator() { |
| return this; |
| } |
| |
| function GeneratorFunctionPrototypeConstructor(x) { |
| if (%_IsConstructCall()) { |
| throw MakeTypeError('not_constructor', ['GeneratorFunctionPrototype']); |
| } |
| } |
| |
| function GeneratorFunctionConstructor(arg1) { // length == 1 |
| var source = NewFunctionString(arguments, 'function*'); |
| var global_receiver = %GlobalReceiver(global); |
| // Compile the string in the constructor and not a helper so that errors |
| // appear to come from here. |
| var f = %CompileString(source, true); |
| if (!IS_FUNCTION(f)) return f; |
| f = %_CallFunction(global_receiver, f); |
| %FunctionMarkNameShouldPrintAsAnonymous(f); |
| return f; |
| } |
| |
| |
| function SetUpGenerators() { |
| %CheckIsBootstrapping(); |
| var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype; |
| InstallFunctions(GeneratorObjectPrototype, |
| DONT_ENUM | DONT_DELETE | READ_ONLY, |
| ["next", GeneratorObjectNext, |
| "throw", GeneratorObjectThrow]); |
| %FunctionSetName(GeneratorObjectIterator, '[Symbol.iterator]'); |
| %SetProperty(GeneratorObjectPrototype, symbolIterator, GeneratorObjectIterator, |
| DONT_ENUM | DONT_DELETE | READ_ONLY); |
| %SetProperty(GeneratorObjectPrototype, "constructor", |
| GeneratorFunctionPrototype, DONT_ENUM | DONT_DELETE | READ_ONLY); |
| %SetPrototype(GeneratorFunctionPrototype, $Function.prototype); |
| %SetCode(GeneratorFunctionPrototype, GeneratorFunctionPrototypeConstructor); |
| %SetProperty(GeneratorFunctionPrototype, "constructor", |
| GeneratorFunction, DONT_ENUM | DONT_DELETE | READ_ONLY); |
| %SetPrototype(GeneratorFunction, $Function); |
| %SetCode(GeneratorFunction, GeneratorFunctionConstructor); |
| } |
| |
| SetUpGenerators(); |