src/add/add.rs.html


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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="Source of the Rust file `examples/add.rs`."><title>add.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="add" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../../static.files/src-script-39ed315d46fb705f.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><div class="sidebar-resizer"></div>
    <main><nav class="sub"><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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</pre></div><pre class="rust"><code><span class="doccomment">//! Add example.
//!
//! Jit compile a function at runtime (generate native host code) which calls a function defined in
//! the example based on the SystemV abi to demonstrate the [`juicebox_asm`] crate.

</span><span class="attr">#[cfg(not(any(target_arch = <span class="string">"x86_64"</span>, target_os = <span class="string">"linux"</span>)))]
</span><span class="macro">compile_error!</span>(<span class="string">"Only supported on x86_64 with SystemV abi"</span>);

<span class="kw">use </span>juicebox_asm::insn::<span class="kw-2">*</span>;
<span class="kw">use </span>juicebox_asm::Runtime;
<span class="kw">use </span>juicebox_asm::{Asm, Imm64, Reg64::<span class="kw-2">*</span>};

<span class="kw">extern </span><span class="string">"C" </span><span class="kw">fn </span>add(a: u32, b: u32) -&gt; u32 {
    a + b
}

<span class="kw">fn </span>main() {
    <span class="kw">let </span><span class="kw-2">mut </span>asm = Asm::new();

    <span class="comment">// SystemV abi:
    //   rdi -&gt; first argument
    //   rsi -&gt; second argument
    //   rax -&gt; return value

    </span>asm.mov(rsi, Imm64::from(<span class="number">42</span>));
    asm.mov(rax, Imm64::from(add <span class="kw">as </span>usize));
    asm.call(rax);
    asm.ret();

    <span class="kw">let </span>code = asm.into_code();
    std::fs::write(<span class="string">"jit.asm"</span>, <span class="kw-2">&amp;</span>code).unwrap();

    <span class="kw">let </span><span class="kw-2">mut </span>rt = Runtime::new();
    <span class="kw">let </span>add42 = <span class="kw">unsafe </span>{ rt.add_code::&lt;<span class="kw">extern </span><span class="string">"C" </span><span class="kw">fn</span>(u32) -&gt; u32&gt;(code) };

    <span class="kw">let </span>res = add42(<span class="number">5</span>);
    <span class="macro">assert_eq!</span>(res, <span class="number">47</span>);
}
</code></pre></div></section></main></body></html>