a295cb7846
R=cbruni@chromium.org Review URL: https://codereview.chromium.org/1413173003 Cr-Commit-Position: refs/heads/master@{#31467}
119 lines
3.8 KiB
JavaScript
119 lines
3.8 KiB
JavaScript
// Copyright 2013 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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(function(global, utils) {
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"use strict";
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%CheckIsBootstrapping();
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// -------------------------------------------------------------------
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// Imports
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var GeneratorFunctionPrototype = utils.ImportNow("GeneratorFunctionPrototype");
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var GeneratorFunction = utils.ImportNow("GeneratorFunction");
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var GlobalFunction = global.Function;
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var MakeTypeError;
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var NewFunctionString;
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var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
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utils.Import(function(from) {
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MakeTypeError = from.MakeTypeError;
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NewFunctionString = from.NewFunctionString;
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});
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// ----------------------------------------------------------------------------
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// Generator functions and objects are specified by ES6, sections 15.19.3 and
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// 15.19.4.
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function GeneratorObjectNext(value) {
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if (!IS_GENERATOR(this)) {
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throw MakeTypeError(kIncompatibleMethodReceiver,
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'[Generator].prototype.next', this);
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}
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var continuation = %GeneratorGetContinuation(this);
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if (continuation > 0) {
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// Generator is suspended.
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DEBUG_PREPARE_STEP_IN_IF_STEPPING(this);
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try {
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return %_GeneratorNext(this, value);
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} catch (e) {
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%GeneratorClose(this);
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throw e;
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}
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} else if (continuation == 0) {
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// Generator is already closed.
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return { value: void 0, done: true };
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} else {
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// Generator is running.
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throw MakeTypeError(kGeneratorRunning);
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}
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}
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function GeneratorObjectThrow(exn) {
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if (!IS_GENERATOR(this)) {
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throw MakeTypeError(kIncompatibleMethodReceiver,
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'[Generator].prototype.throw', this);
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}
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var continuation = %GeneratorGetContinuation(this);
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if (continuation > 0) {
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// Generator is suspended.
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try {
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return %_GeneratorThrow(this, exn);
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} catch (e) {
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%GeneratorClose(this);
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throw e;
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}
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} else if (continuation == 0) {
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// Generator is already closed.
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throw exn;
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} else {
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// Generator is running.
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throw MakeTypeError(kGeneratorRunning);
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}
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}
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function GeneratorFunctionConstructor(arg1) { // length == 1
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var source = NewFunctionString(arguments, 'function*');
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var global_proxy = %GlobalProxy(GeneratorFunctionConstructor);
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// Compile the string in the constructor and not a helper so that errors
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// appear to come from here.
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var f = %_CallFunction(global_proxy, %CompileString(source, true));
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%FunctionMarkNameShouldPrintAsAnonymous(f);
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return f;
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}
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// ----------------------------------------------------------------------------
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// Both Runtime_GeneratorNext and Runtime_GeneratorThrow are supported by
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// neither Crankshaft nor TurboFan, disable optimization of wrappers here.
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%NeverOptimizeFunction(GeneratorObjectNext);
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%NeverOptimizeFunction(GeneratorObjectThrow);
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// Set up non-enumerable functions on the generator prototype object.
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var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
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utils.InstallFunctions(GeneratorObjectPrototype,
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DONT_ENUM,
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["next", GeneratorObjectNext,
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"throw", GeneratorObjectThrow]);
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%AddNamedProperty(GeneratorObjectPrototype, "constructor",
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GeneratorFunctionPrototype, DONT_ENUM | READ_ONLY);
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%AddNamedProperty(GeneratorObjectPrototype,
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toStringTagSymbol, "Generator", DONT_ENUM | READ_ONLY);
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%InternalSetPrototype(GeneratorFunctionPrototype, GlobalFunction.prototype);
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%AddNamedProperty(GeneratorFunctionPrototype,
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toStringTagSymbol, "GeneratorFunction", DONT_ENUM | READ_ONLY);
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%AddNamedProperty(GeneratorFunctionPrototype, "constructor",
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GeneratorFunction, DONT_ENUM | READ_ONLY);
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%InternalSetPrototype(GeneratorFunction, GlobalFunction);
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%SetCode(GeneratorFunction, GeneratorFunctionConstructor);
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})
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