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// 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);
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);
}
}
// ----------------------------------------------------------------------------
// 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,
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);
})
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