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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `wasmer_runtime` crate."><meta name="keywords" content="rust, rustlang, rust-lang, wasmer_runtime"><title>wasmer_runtime - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="https://wasmer.io/static/icons/favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../wasmer_runtime/index.html'><div class='logo-container'><img src='https://avatars3.githubusercontent.com/u/44205449?s=200&v=4' alt='logo'></div></a><p class='location'>Crate wasmer_runtime</p><div class="sidebar-elems"><a id='all-types' href='all.html'><p>See all wasmer_runtime's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#macros">Macros</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#constants">Constants</a></li><li><a href="#functions">Functions</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'wasmer_runtime', ty: 'mod', relpath: '../'};</script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/wasmer_runtime/lib.rs.html#1-245' title='goto source code'>[src]</a></span><span class='in-band'>Crate <a class="mod" href=''>wasmer_runtime</a></span></h1><div class='docblock'><p>Wasmer-runtime is a library that makes embedding WebAssembly
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in your application easy, efficient, and safe.</p>
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<h1 id="how-to-use-wasmer-runtime" class="section-header"><a href="#how-to-use-wasmer-runtime">How to use Wasmer-Runtime</a></h1>
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<p>The easiest way is to use the <a href="fn.instantiate.html"><code>instantiate</code></a> function to create an <a href="struct.Instance.html"><code>Instance</code></a>.
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Then you can use <a href="struct.Instance.html#method.call"><code>call</code></a> or <a href="struct.Instance.html#method.func"><code>func</code></a> and then <a href="struct.Function.html#method.call"><code>call</code></a> to call an exported function safely.</p>
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<h2 id="heres-an-example" class="section-header"><a href="#heres-an-example">Here's an example:</a></h2>
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<p>Given this WebAssembly:</p>
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<pre><code class="language-wat">(module
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(type $t0 (func (param i32) (result i32)))
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(func $add_one (export "add_one") (type $t0) (param $p0 i32) (result i32)
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get_local $p0
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i32.const 1
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i32.add))
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</code></pre>
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<p>compiled into wasm bytecode, we can call the exported "add_one" function:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">static</span> <span class="ident">WASM</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> [<span class="ident">u8</span>] <span class="op">=</span> <span class="kw-2">&</span>[
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<span class="comment">// The module above compiled to bytecode goes here.</span>
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<span class="comment">// ...</span>
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];
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<span class="kw">use</span> <span class="ident">wasmer_runtime</span>::{
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<span class="ident">instantiate</span>,
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<span class="ident">Value</span>,
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<span class="ident">imports</span>,
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<span class="ident">error</span>,
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<span class="ident">Func</span>,
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};
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<span class="kw">fn</span> <span class="ident">main</span>() <span class="op">-</span><span class="op">></span> <span class="ident">error</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
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<span class="comment">// We're not importing anything, so make an empty import object.</span>
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<span class="kw">let</span> <span class="ident">import_object</span> <span class="op">=</span> <span class="macro">imports</span><span class="macro">!</span> {};
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">instance</span> <span class="op">=</span> <span class="ident">instantiate</span>(<span class="ident">WASM</span>, <span class="kw-2">&</span><span class="ident">import_object</span>)<span class="question-mark">?</span>;
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<span class="kw">let</span> <span class="ident">add_one</span>: <span class="ident">Func</span><span class="op"><</span><span class="ident">i32</span>, <span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">instance</span>.<span class="ident">func</span>(<span class="string">"add_one"</span>)<span class="question-mark">?</span>;
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<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">add_one</span>.<span class="ident">call</span>(<span class="number">42</span>)<span class="question-mark">?</span>;
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>, <span class="number">43</span>);
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<span class="prelude-val">Ok</span>(())
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}</pre></div>
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<h1 id="additional-notes" class="section-header"><a href="#additional-notes">Additional Notes:</a></h1>
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<p>The <code>wasmer-runtime</code> is build to support compiler multiple backends.
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Currently, we support the <a href="https://github.com/CraneStation/cranelift">Cranelift</a> compiler with the <a href="https://crates.io/crates/wasmer-clif-backend"><code>wasmer-clif-backend</code></a> crate.</p>
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<p>You can specify the compiler you wish to use with the <a href="fn.compile_with.html"><code>compile_with</code></a> function.</p>
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</div><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
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<table><tr class='module-item'><td><a class="mod" href="cache/index.html" title='wasmer_runtime::cache mod'>cache</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="error/index.html" title='wasmer_runtime::error mod'>error</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="memory/index.html" title='wasmer_runtime::memory mod'>memory</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="units/index.html" title='wasmer_runtime::units mod'>units</a></td><td class='docblock-short'><p>Various unit types.</p>
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</td></tr><tr class='module-item'><td><a class="mod" href="wasm/index.html" title='wasmer_runtime::wasm mod'>wasm</a></td><td class='docblock-short'><p>Various types exposed by the Wasmer Runtime.</p>
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</td></tr></table><h2 id='macros' class='section-header'><a href="#macros">Macros</a></h2>
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<table><tr class='module-item'><td><a class="macro" href="macro.func.html" title='wasmer_runtime::func macro'>func</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="macro" href="macro.imports.html" title='wasmer_runtime::imports macro'>imports</a></td><td class='docblock-short'><p>Generate an <a href="struct.ImportObject.html"><code>ImportObject</code></a> safely.</p>
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</td></tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table><tr class='module-item'><td><a class="struct" href="struct.Ctx.html" title='wasmer_runtime::Ctx struct'>Ctx</a></td><td class='docblock-short'><p>The context of the currently running WebAssembly instance.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.DynFunc.html" title='wasmer_runtime::DynFunc struct'>DynFunc</a></td><td class='docblock-short'><p>A representation of an exported WebAssembly function.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Func.html" title='wasmer_runtime::Func struct'>Func</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="struct" href="struct.Global.html" title='wasmer_runtime::Global struct'>Global</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="struct" href="struct.ImportObject.html" title='wasmer_runtime::ImportObject struct'>ImportObject</a></td><td class='docblock-short'><p>All of the import data used when instantiating.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Instance.html" title='wasmer_runtime::Instance struct'>Instance</a></td><td class='docblock-short'><p>An instantiated WebAssembly module.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Memory.html" title='wasmer_runtime::Memory struct'>Memory</a></td><td class='docblock-short'><p>A shared or unshared wasm linear memory.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.MiddlewareChain.html" title='wasmer_runtime::MiddlewareChain struct'>MiddlewareChain</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="struct" href="struct.Module.html" title='wasmer_runtime::Module struct'>Module</a></td><td class='docblock-short'><p>A compiled WebAssembly module.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.StreamingCompiler.html" title='wasmer_runtime::StreamingCompiler struct'>StreamingCompiler</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="struct" href="struct.Table.html" title='wasmer_runtime::Table struct'>Table</a></td><td class='docblock-short'></td></tr></table><h2 id='enums' class='section-header'><a href="#enums">Enums</a></h2>
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<table><tr class='module-item'><td><a class="enum" href="enum.Backend.html" title='wasmer_runtime::Backend enum'>Backend</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="enum" href="enum.Export.html" title='wasmer_runtime::Export enum'>Export</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="enum" href="enum.Value.html" title='wasmer_runtime::Value enum'>Value</a></td><td class='docblock-short'><p>Represents a WebAssembly value.</p>
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</td></tr></table><h2 id='constants' class='section-header'><a href="#constants">Constants</a></h2>
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<table><tr class='module-item'><td><a class="constant" href="constant.VERSION.html" title='wasmer_runtime::VERSION constant'>VERSION</a></td><td class='docblock-short'><p>The current version of this crate</p>
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</td></tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
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<table><tr class='module-item'><td><a class="fn" href="fn.compile.html" title='wasmer_runtime::compile fn'>compile</a></td><td class='docblock-short'><p>Compile WebAssembly binary code into a <a href="struct.Module.html"><code>Module</code></a>.
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This function is useful if it is necessary to
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compile a module before it can be instantiated
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(otherwise, the <a href="fn.instantiate.html"><code>instantiate</code></a> function should be used).</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.compile_with.html" title='wasmer_runtime::compile_with fn'>compile_with</a></td><td class='docblock-short'><p>Compile a <a href="struct.Module.html"><code>Module</code></a> using the provided compiler from
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WebAssembly binary code. This function is useful if it
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is necessary to a compile a module before it can be instantiated
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and must be used if you wish to use a different backend from the default.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.compile_with_config.html" title='wasmer_runtime::compile_with_config fn'>compile_with_config</a></td><td class='docblock-short'><p>The same as <code>compile</code> but takes a <code>CompilerConfig</code> for the purpose of
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changing the compiler's behavior</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.compile_with_config_with.html" title='wasmer_runtime::compile_with_config_with fn'>compile_with_config_with</a></td><td class='docblock-short'><p>The same as <code>compile_with_config</code> but takes a <code>Compiler</code> for the purpose of
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changing the backend.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.compiler_for_backend.html" title='wasmer_runtime::compiler_for_backend fn'>compiler_for_backend</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="fn" href="fn.default_compiler.html" title='wasmer_runtime::default_compiler fn'>default_compiler</a></td><td class='docblock-short'><p>Get a single instance of the default compiler to use.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.instantiate.html" title='wasmer_runtime::instantiate fn'>instantiate</a></td><td class='docblock-short'><p>Compile and instantiate WebAssembly code without
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creating a <a href="struct.Module.html"><code>Module</code></a>.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.validate.html" title='wasmer_runtime::validate fn'>validate</a></td><td class='docblock-short'><p>Perform validation as defined by the
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WebAssembly specification. Returns <code>true</code> if validation
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succeeded, <code>false</code> if validation failed.</p>
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</td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../";window.currentCrate = "wasmer_runtime";</script><script src="../aliases.js"></script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>
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