| // 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 GlobalFunction = global.Function; |
| |
| var NewFunctionString; |
| |
| utils.Import(function(from) { |
| NewFunctionString = from.NewFunctionString; |
| }); |
| |
| // ---------------------------------------------------------------------------- |
| |
| // 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. |
| if (DEBUG_IS_ACTIVE) %DebugPrepareStepInIfStepping(this); |
| try { |
| return %_GeneratorNext(this, value); |
| } catch (e) { |
| %GeneratorClose(this); |
| throw e; |
| } |
| } else if (continuation == 0) { |
| // Generator is already closed. |
| return { value: void 0, done: 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. |
| try { |
| return %_GeneratorThrow(this, exn); |
| } catch (e) { |
| %GeneratorClose(this); |
| throw e; |
| } |
| } else if (continuation == 0) { |
| // Generator is already closed. |
| throw exn; |
| } else { |
| // Generator is running. |
| throw MakeTypeError(kGeneratorRunning); |
| } |
| } |
| |
| |
| function GeneratorFunctionConstructor(arg1) { // length == 1 |
| var source = NewFunctionString(arguments, 'function*'); |
| var global_proxy = %GlobalProxy(GeneratorFunctionConstructor); |
| // Compile the string in the constructor and not a helper so that errors |
| // appear to come from here. |
| var f = %_CallFunction(global_proxy, %CompileString(source, true)); |
| %FunctionMarkNameShouldPrintAsAnonymous(f); |
| return f; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| // Both Runtime_GeneratorNext and Runtime_GeneratorThrow are supported by |
| // neither Crankshaft nor TurboFan, disable optimization of wrappers here. |
| %NeverOptimizeFunction(GeneratorObjectNext); |
| %NeverOptimizeFunction(GeneratorObjectThrow); |
| |
| // Set up non-enumerable functions on the generator prototype object. |
| var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype; |
| utils.InstallFunctions(GeneratorObjectPrototype, |
| DONT_ENUM, |
| ["next", GeneratorObjectNext, |
| "throw", GeneratorObjectThrow]); |
| |
| %AddNamedProperty(GeneratorObjectPrototype, "constructor", |
| GeneratorFunctionPrototype, DONT_ENUM | READ_ONLY); |
| %AddNamedProperty(GeneratorObjectPrototype, |
| symbolToStringTag, "Generator", DONT_ENUM | READ_ONLY); |
| %InternalSetPrototype(GeneratorFunctionPrototype, GlobalFunction.prototype); |
| %AddNamedProperty(GeneratorFunctionPrototype, |
| symbolToStringTag, "GeneratorFunction", DONT_ENUM | READ_ONLY); |
| %AddNamedProperty(GeneratorFunctionPrototype, "constructor", |
| GeneratorFunction, DONT_ENUM | READ_ONLY); |
| %InternalSetPrototype(GeneratorFunction, GlobalFunction); |
| %SetCode(GeneratorFunction, GeneratorFunctionConstructor); |
| |
| }) |