1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 "use strict"; 6 7 // This file relies on the fact that the following declarations have been made 8 // in runtime.js: 9 // var $Function = global.Function; 10 11 // ---------------------------------------------------------------------------- 12 13 14 // Generator functions and objects are specified by ES6, sections 15.19.3 and 15 // 15.19.4. 16 17 function GeneratorObjectNext(value) { 18 if (!IS_GENERATOR(this)) { 19 throw MakeTypeError('incompatible_method_receiver', 20 ['[Generator].prototype.next', this]); 21 } 22 23 return %_GeneratorNext(this, value); 24 } 25 26 function GeneratorObjectThrow(exn) { 27 if (!IS_GENERATOR(this)) { 28 throw MakeTypeError('incompatible_method_receiver', 29 ['[Generator].prototype.throw', this]); 30 } 31 32 return %_GeneratorThrow(this, exn); 33 } 34 35 function GeneratorObjectIterator() { 36 return this; 37 } 38 39 function GeneratorFunctionPrototypeConstructor(x) { 40 if (%_IsConstructCall()) { 41 throw MakeTypeError('not_constructor', ['GeneratorFunctionPrototype']); 42 } 43 } 44 45 function GeneratorFunctionConstructor(arg1) { // length == 1 46 var source = NewFunctionString(arguments, 'function*'); 47 var global_receiver = %GlobalReceiver(global); 48 // Compile the string in the constructor and not a helper so that errors 49 // appear to come from here. 50 var f = %CompileString(source, true); 51 if (!IS_FUNCTION(f)) return f; 52 f = %_CallFunction(global_receiver, f); 53 %FunctionMarkNameShouldPrintAsAnonymous(f); 54 return f; 55 } 56 57 58 function SetUpGenerators() { 59 %CheckIsBootstrapping(); 60 var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype; 61 InstallFunctions(GeneratorObjectPrototype, 62 DONT_ENUM | DONT_DELETE | READ_ONLY, 63 ["next", GeneratorObjectNext, 64 "throw", GeneratorObjectThrow]); 65 %FunctionSetName(GeneratorObjectIterator, '[Symbol.iterator]'); 66 %SetProperty(GeneratorObjectPrototype, symbolIterator, GeneratorObjectIterator, 67 DONT_ENUM | DONT_DELETE | READ_ONLY); 68 %SetProperty(GeneratorObjectPrototype, "constructor", 69 GeneratorFunctionPrototype, DONT_ENUM | DONT_DELETE | READ_ONLY); 70 %SetPrototype(GeneratorFunctionPrototype, $Function.prototype); 71 %SetCode(GeneratorFunctionPrototype, GeneratorFunctionPrototypeConstructor); 72 %SetProperty(GeneratorFunctionPrototype, "constructor", 73 GeneratorFunction, DONT_ENUM | DONT_DELETE | READ_ONLY); 74 %SetPrototype(GeneratorFunction, $Function); 75 %SetCode(GeneratorFunction, GeneratorFunctionConstructor); 76 } 77 78 SetUpGenerators(); 79
