WebKit/Source/JavaScriptCore/builtins/GeneratorPrototype.js at main · WebKit/WebKit · GitHub

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* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR

* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// This implements https://tc39.es/ecma262/#sec-generatorresume and https://tc39.es/ecma262/#sec-generatorresumeabrupt

// with exception of [[GeneratorBrand]] check and handling of [[GeneratorState]] equal to *completed*.

@linkTimeConstant

function generatorResume(generator, state, value, resumeMode)

{

"use strict";

var done = true;

if (state !== @GeneratorStateCompleted) {

@putGeneratorInternalField(generator, @generatorFieldState, @GeneratorStateExecuting);

try {

var value = @getGeneratorInternalField(generator, @generatorFieldNext).@call(@getGeneratorInternalField(generator, @generatorFieldThis), generator, state, value, resumeMode, @getGeneratorInternalField(generator, @generatorFieldFrame));

} catch (error) {

@putGeneratorInternalField(generator, @generatorFieldState, @GeneratorStateCompleted);

throw error;

}

done = @getGeneratorInternalField(generator, @generatorFieldState) === @GeneratorStateExecuting;

if (done)

@putGeneratorInternalField(generator, @generatorFieldState, @GeneratorStateCompleted);

}

return { value, done };

}

function next(value)

{

"use strict";

if (!@isGenerator(this))

@throwTypeError("|this| should be a generator");

var state = @getGeneratorInternalField(this, @generatorFieldState);

if (state === @GeneratorStateExecuting)

@throwTypeError("Generator is executing");

if (state === @GeneratorStateCompleted)

value = @undefined;

return @generatorResume(this, state, value, @GeneratorResumeModeNormal);

}

function return(value)

{

"use strict";

if (!@isGenerator(this))

@throwTypeError("|this| should be a generator");

var state = @getGeneratorInternalField(this, @generatorFieldState);

if (state === @GeneratorStateExecuting)

@throwTypeError("Generator is executing");

return @generatorResume(this, state, value, @GeneratorResumeModeReturn);

}

function throw(exception)

{

"use strict";

if (!@isGenerator(this))

@throwTypeError("|this| should be a generator");

var state = @getGeneratorInternalField(this, @generatorFieldState);

if (state === @GeneratorStateExecuting)

@throwTypeError("Generator is executing");

if (state === @GeneratorStateCompleted)

throw exception;

return @generatorResume(this, state, exception, @GeneratorResumeModeThrow);

}

WebKit/Source/JavaScriptCore/builtins/GeneratorPrototype.js at main · WebKit/WebKit · GitHub

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