https://github.com/jterrace/js.js

js.js: A JavaScript JavaScript interpreter
https://github.com/jterrace/js.js

Last synced: 5 days ago
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js.js: A JavaScript JavaScript interpreter

• Host: GitHub
• URL: https://github.com/jterrace/js.js
• Owner: jterrace
• License: other
• Created: 2011-09-29T16:02:37.000Z (almost 13 years ago)
• Default Branch: master
• Last Pushed: 2022-02-19T20:23:41.000Z (over 2 years ago)
• Last Synced: 2024-03-09T18:39:09.371Z (4 months ago)
• Language: JavaScript
• Homepage:
• Size: 75.9 MB
• Stars: 1,077
• Watchers: 45
• Forks: 98
• Open Issues: 6
• Metadata Files:
  • Readme: README.rst
  • License: LICENSE

Lists

• awesome-stars - jterrace/js.js - js.js: A JavaScript JavaScript interpreter (JavaScript)
• awesome-javascript-interpreters - jterrace/js.js - commit/jterrace/js.js) | based on SpiderMonkey, last version 2012 (javascript interpreters / old projects)

README

        

js.js is a JavaScript interpreter in JavaScript. Instead of trying to create an

interpreter from scratch, SpiderMonkey_ is compiled into LLVM_ and then

emscripten_ translates the output into JavaScript.

-----

Demos

-----

See several running demos `here `_.

Paper

-----

Academic paper to appear at

`WebApps 2012 `_ located

`here `_.

Status

------

The compiled version of js.js is 3MB and only **594KB** after gzip compression.

Using the Sunspider_ benchmark, the interpreter is about **200 times slower**

than Spidermonkey's native interpreter with the JIT compiler turned off. More

optimizations and benchmarks are coming soon.

Example Use

-----------

Here is an example of how to use the API::

    var jsObjs = JSJS.Init();

    var rval = JSJS.EvaluateScript(jsObjs.cx, jsObjs.glob, "1 + 1");

    var d = JSJS.ValueToNumber(jsObjs.cx, rval);

    window.alert(d); //2

    JSJS.End(jsObjs);

More examples are available in the ``examples`` directory.

Files

-----

The following files are located in the ``src`` directory.

=================== =========

File                Description

=================== =========

``js.O0.js``        Command-line JS shell, no optimizations

``js.O0.min.js``    Command-line JS shell, no optimizations, closure compiled

``js.O1.js``        Command-line JS shell, O1 optimizations

``js.O1.min.js``    Command-line JS shell, O1 optimizations, closure compiled

``js.O2.js``        Command-line JS shell, O2 optimizations

``js.O2.min.js``    Command-line JS shell, O2 optimizations, closure compiled

``libjs.O0.js``     JSAPI shared library, no optimizations

``libjs.O0.min.js`` JSAPI shared library, no optimizations, closure compiled with js.js wrapper

``libjs.O1.js``     JSAPI shared library, O1 optimizations

``libjs.O1.min.js`` JSAPI shared library, O1 optimizations, closure compiled with js.js wrapper

``libjs.O2.js``     JSAPI shared library, O2 optimizations

``libjs.O2.min.js`` JSAPI shared library, O2 optimizations, closure compiled with js.js wrapper

``jsjs-wrapper.js`` js.js wrapper API to make using the JSAPI easier

=================== =========

To run the shell, you want to run one of these::

    js js.O2.min.js -e "print('hello');"

    node js.O2.min.js -e "print('hello');"

To include the API in your website, include the minified libjs like this::

    

Alternatively, you can use the wrapper script directly with a non-minified

version (useful for debugging and modifications)::

    

    

.. _SpiderMonkey: https://spidermonkey.dev/

.. _emscripten: http://emscripten.org/

.. _LLVM: http://llvm.org/

.. _Sunspider: http://www.webkit.org/perf/sunspider/sunspider.html