<!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 `src/lib.rs`."><title>lib.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="juicebox_asm" 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> <a href="#2" id="2">2</a> <a href="#3" id="3">3</a> <a href="#4" id="4">4</a> <a href="#5" id="5">5</a> <a href="#6" id="6">6</a> <a href="#7" id="7">7</a> <a href="#8" id="8">8</a> <a href="#9" id="9">9</a> <a href="#10" id="10">10</a> <a href="#11" id="11">11</a> <a href="#12" id="12">12</a> <a href="#13" id="13">13</a> <a href="#14" id="14">14</a> <a href="#15" id="15">15</a> <a href="#16" id="16">16</a> <a href="#17" id="17">17</a> <a href="#18" id="18">18</a> <a href="#19" id="19">19</a> <a href="#20" id="20">20</a> <a href="#21" id="21">21</a> <a href="#22" id="22">22</a> <a href="#23" id="23">23</a> <a href="#24" id="24">24</a> <a href="#25" id="25">25</a> <a href="#26" id="26">26</a> <a href="#27" id="27">27</a> <a href="#28" id="28">28</a> <a href="#29" id="29">29</a> <a href="#30" id="30">30</a> <a href="#31" id="31">31</a> <a href="#32" id="32">32</a> <a href="#33" id="33">33</a> <a href="#34" id="34">34</a> <a href="#35" id="35">35</a> <a href="#36" id="36">36</a> <a href="#37" id="37">37</a> <a href="#38" id="38">38</a> <a href="#39" id="39">39</a> <a href="#40" id="40">40</a> <a href="#41" id="41">41</a> <a href="#42" id="42">42</a> <a href="#43" id="43">43</a> <a href="#44" id="44">44</a> <a href="#45" id="45">45</a> <a href="#46" id="46">46</a> <a href="#47" id="47">47</a> <a href="#48" id="48">48</a> <a href="#49" id="49">49</a> <a href="#50" id="50">50</a> <a href="#51" id="51">51</a> <a href="#52" id="52">52</a> <a href="#53" id="53">53</a> <a href="#54" id="54">54</a> <a href="#55" id="55">55</a> <a href="#56" id="56">56</a> <a href="#57" id="57">57</a> <a href="#58" id="58">58</a> <a href="#59" id="59">59</a> <a href="#60" id="60">60</a> <a href="#61" id="61">61</a> <a href="#62" id="62">62</a> <a href="#63" id="63">63</a> <a href="#64" id="64">64</a> <a href="#65" id="65">65</a> <a href="#66" id="66">66</a> <a href="#67" id="67">67</a> <a href="#68" id="68">68</a> <a href="#69" id="69">69</a> <a href="#70" id="70">70</a> <a href="#71" id="71">71</a> <a href="#72" id="72">72</a> <a href="#73" id="73">73</a> <a href="#74" id="74">74</a> <a href="#75" id="75">75</a> <a href="#76" id="76">76</a> <a href="#77" id="77">77</a> <a href="#78" id="78">78</a> <a href="#79" id="79">79</a> <a href="#80" id="80">80</a> <a href="#81" id="81">81</a> <a href="#82" id="82">82</a> <a href="#83" id="83">83</a> <a href="#84" id="84">84</a> <a href="#85" id="85">85</a> <a href="#86" id="86">86</a> <a href="#87" id="87">87</a> <a href="#88" id="88">88</a> <a href="#89" id="89">89</a> <a href="#90" id="90">90</a> <a href="#91" id="91">91</a> <a href="#92" id="92">92</a> <a href="#93" id="93">93</a> <a href="#94" id="94">94</a> <a href="#95" id="95">95</a> <a href="#96" id="96">96</a> <a href="#97" id="97">97</a> <a href="#98" id="98">98</a> <a href="#99" id="99">99</a> <a href="#100" id="100">100</a> <a href="#101" id="101">101</a> <a href="#102" id="102">102</a> <a href="#103" id="103">103</a> <a href="#104" id="104">104</a> <a href="#105" id="105">105</a> <a href="#106" id="106">106</a> <a href="#107" id="107">107</a> </pre></div><pre class="rust"><code><span class="doccomment">//! A simple `x64` jit assembler with a minimal runtime to execute emitted code for fun. //! //! The following is an fibonacci example implementation. //! ```rust //! use juicebox_asm::{Asm, Reg64, Imm64, Label}; //! use juicebox_asm::insn::*; //! use juicebox_asm::Runtime; //! //! const fn fib_rs(n: u64) -> u64 { //! match n { //! 0 => 0, //! 1 => 1, //! _ => fib_rs(n - 2) + fib_rs(n - 1), //! } //! } //! //! fn main() { //! let mut asm = Asm::new(); //! //! let mut lp = Label::new(); //! let mut end = Label::new(); //! //! // Reference implementation: //! // //! // int fib(int n) { //! // int tmp = 0; //! // int prv = 1; //! // int sum = 0; //! // loop: //! // if (n == 0) goto end; //! // tmp = sum; //! // sum += prv; //! // prv = tmp; //! // --n; //! // goto loop; //! // end: //! // return sum; //! // } //! //! // SystemV abi: //! // rdi -> first argument //! // rax -> return value //! let n = Reg64::rdi; //! let sum = Reg64::rax; //! //! let tmp = Reg64::rcx; //! let prv = Reg64::rbx; //! //! asm.mov(tmp, Imm64::from(0)); //! asm.mov(prv, Imm64::from(1)); //! asm.mov(sum, Imm64::from(0)); //! //! asm.bind(&mut lp); //! asm.test(n, n); //! asm.jz(&mut end); //! asm.mov(tmp, sum); //! asm.add(sum, prv); //! asm.mov(prv, tmp); //! asm.dec(n); //! asm.jmp(&mut lp); //! asm.bind(&mut end); //! asm.ret(); //! //! // Move code into executable page and get function pointer to it. //! let mut rt = Runtime::new(); //! let fib = unsafe { rt.add_code::<extern "C" fn(u64) -> u64>(&asm.into_code()) }; //! //! for n in 0..15 { //! let fib_jit = fib(n); //! println!("fib({}) = {}", n, fib_jit); //! assert_eq!(fib_jit, fib_rs(n)); //! } //! } //! ``` </span><span class="kw">mod </span>asm; <span class="kw">mod </span>imm; <span class="kw">mod </span>label; <span class="kw">mod </span>reg; <span class="kw">mod </span>rt; <span class="kw">pub mod </span>insn; <span class="kw">pub use </span>asm::Asm; <span class="kw">pub use </span>imm::{Imm16, Imm32, Imm64, Imm8}; <span class="kw">pub use </span>label::Label; <span class="kw">pub use </span>reg::{Reg16, Reg32, Reg64, Reg8}; <span class="kw">pub use </span>rt::Runtime; <span class="doccomment">/// Type representing a memory operand. </span><span class="kw">pub enum </span>MemOp { <span class="doccomment">/// An indirect memory operand, eg `mov [rax], rcx`. </span>Indirect(Reg64), <span class="doccomment">/// An indirect memory operand with additional displacement, eg `mov [rax + 0x10], rcx`. </span>IndirectDisp(Reg64, i32), } <span class="kw">impl </span>MemOp { <span class="doccomment">/// Get the base address register of the memory operand. </span><span class="kw">const fn </span>base(<span class="kw-2">&</span><span class="self">self</span>) -> Reg64 { <span class="kw">match </span><span class="self">self </span>{ MemOp::Indirect(base) => <span class="kw-2">*</span>base, MemOp::IndirectDisp(base, ..) => <span class="kw-2">*</span>base, } } } </code></pre></div></section></main></body></html>