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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>binaryen.js</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="css/reveal.css">
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<script>
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link.rel = 'stylesheet';
link.type = 'text/css';
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<style type="text/css">
b {
color: #b25d0b;
}
strong {
color: #b25d0b;
}
</style>
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<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h1>binaryen.js</h1>
<br>
<hr>
<br>
<h3>Creating <b>WebAssembly</b><br>from <strong>JavaScript</strong></h3>
</section>
<section>
<h3>Background</h3>
<hr>
<p>
<a href="http://webassembly.org/">WebAssembly</a> (wasm) is a new binary executable format for the web.
</p>
<p>
It's <b>compact</b> and <strong>fast</strong>.
</p>
</section>
<section>
<h3>Binaryen</h3>
<hr>
<p>
A <a href="https://github.com/WebAssembly/binaryen">compiler library</a> for WebAssembly, providing a reader, writer, optimizer, etc.
</p>
<div class="fragment">
<p>
Binaryen optimizer shrinks LLVM wasm binaries by <b>~5%</b> (C++ and Rust) by just doing
<pre><code data-trim contenteditable>
wasm-opt -Os input.wasm -o output.wasm
</code></pre>
</p>
<p>
(like a JavaScript minifier, but for WebAssembly)
</p>
</div>
</section>
<section>
<h3>You can write a compiler<br>with Binaryen</h3>
<hr>
<ul>
<li>Has a <b>C API</b></li>
<li class="fragment">Has a <strong>JavaScript port</strong>: <a href="https://github.com/WebAssembly/binaryen/blob/master/bin/binaryen.js">binaryen.js</a></li>
</li>
</section>
<section>
<h3>binaryen.js</h3>
<hr>
<p>
The <a href="https://github.com/WebAssembly/binaryen/blob/master/docs/binaryen.js.Markdown">API</a> lets you:
</p>
<ul>
<li><b>Create</b> Binaryen IR</li>
<li><strong>Optimize</strong> & <strong>minify</strong> it</li>
<li><b>Generate wasm</b> from that</li>
</ul>
</section>
<section>
<h2>Creating IR</h2>
<hr>
<pre><code class="hljs" data-trim contenteditable>
// Example from a Mandlebrot computation
// if we ran enough iterations, return 0
var code = module.if(
module.i32.ge_u( // >= (unsigned)
module.get_local(6, Binaryen.i32), // the counter
module.i32.const(MAX_ITERS_PER_PIXEL) // the limit
),
module.return(
module.i32.const(0)
)
);
</code></pre>
</section>
<section>
<h2>Creating wasm</h2>
<hr>
<pre><code class="hljs" data-trim contenteditable>
// Create a module
var module = new Binaryen.Module();
// [..create a function type and the function body..]
// Add a function
module.addFunction('function_name', type, [], body);
// Optionally, optimize the module
module.optimize();
// Get a wasm binary (in typed array form)
var binary = module.emitBinary();
</code></pre>
</section>
<section>
<h2>Running the wasm</h2>
<hr>
<pre><code class="hljs" data-trim contenteditable>
// Create an instance we can call
// (normally you'd use the async APIs, but this is tiny)
var wasm = new WebAssembly.Instance(
new WebAssembly.Module(binary),
{}
);
// Call it!
wasm.exports.function_name();
</code></pre>
</section>
<section>
<h3>Demo</h3>
<hr>
<iframe src="mandlebrot/mandlebrot.html" width="300" height="300" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" style="border:3px solid #666; margin-bottom:5px; max-width: 100%;" allowfullscreen> </iframe>
</iframe>
<p>
(this page used binaryen.js to create the wasm to draw this)
</p>
<p class="fragment">
<strong>The end, thanks for listening!</strong>
</p>
</section>
</div>
</div>
<script src="lib/js/head.min.js"></script>
<script src="js/reveal.js"></script>
<script>
// More info https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({
controls: true,
progress: true,
history: true,
center: true,
transition: 'slide', // none/fade/slide/convex/concave/zoom
// More info https://github.com/hakimel/reveal.js#dependencies
dependencies: [
{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
{ src: 'plugin/search/search.js', async: true },
{ src: 'plugin/zoom-js/zoom.js', async: true },
{ src: 'plugin/notes/notes.js', async: true }
]
});
</script>
</body>
</html>