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Nugine committed Jan 13, 2020
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<!DOCTYPE HTML>
<html lang="zh-CN" class="sidebar-visible no-js light">
<head>
<!-- Book generated using mdBook -->
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<title>1. 背景知识 - Brainfuck JIT 虚拟机教程</title>


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</script>

<nav id="sidebar" class="sidebar" aria-label="Table of contents">
<div id="sidebar-scrollbox" class="sidebar-scrollbox">
<ol class="chapter"><li class="expanded affix "><a href="introduction.html">介绍</a></li><li class="expanded "><a href="1.html" class="active"><strong aria-hidden="true">1.</strong> 背景知识</a></li><li class="expanded "><a href="2.html"><strong aria-hidden="true">2.</strong> 启动项目</a></li><li class="expanded "><a href="3.html"><strong aria-hidden="true">3.</strong> 中间表示</a></li><li class="expanded "><a href="4.html"><strong aria-hidden="true">4.</strong> Hello, JIT</a></li><li class="expanded "><a href="5.html"><strong aria-hidden="true">5.</strong> 来点错误</a></li><li class="expanded "><a href="6.html"><strong aria-hidden="true">6.</strong> 实现虚拟机</a></li><li class="expanded "><a href="7.html"><strong aria-hidden="true">7.</strong> 生成机器码</a></li><li class="expanded "><a href="8.html"><strong aria-hidden="true">8.</strong> 命令行界面</a></li><li class="expanded affix "><a href="conclusion.html">结语</a></li></ol>
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<h1 class="menu-title">Brainfuck JIT 虚拟机教程</h1>

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});
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<div id="content" class="content">
<main>
<h1><a class="header" href="#1-背景知识" id="1-背景知识">1. 背景知识</a></h1>
<h2><a class="header" href="#brainfuck-简介" id="brainfuck-简介">Brainfuck 简介</a></h2>
<p><a href="https://en.wikipedia.org/wiki/Brainfuck">https://en.wikipedia.org/wiki/Brainfuck</a></p>
<p>Brainfuck 仅包含八个指令，却是图灵完备的，理论上它可以做到任何用图灵机能做到的事情。</p>
<p>机器模型：一个字节数组，一个数据指针，一个指令指针，输入流，输出流。</p>
<p>数组初始化为全零，数据指针初始时指向数组的第一个字节，指令指针指向第一条指令。</p>
<p>字符 '&gt;'：将数据指针加一。</p>
<p>字符 '&lt;'：将数据指针减一。</p>
<p>字符 '+'：将数据指针所指的单元加一。</p>
<p>字符 '-'：将数据指针所指的单元减一。</p>
<p>字符 ','：从输入流中读取一个字节，存入数据指针所指单元。</p>
<p>字符 '.'：输出数据指针所指单元的字节。</p>
<p>字符 '['：如果当前单元是 0，那么跳转到对应的 ']' 的下一条指令，否则继续执行。</p>
<p>字符 ']'：如果当前单元不是 0，那么跳转到对应的 '[' 的下一条指令，否则继续执行。</p>
<p>Brainfuck 可以直接对应到 C 代码，仅用几十行就能写个从 bf 到 c 的编译器。</p>
<p>初始化</p>
<pre><code class="language-c">char array[30000] = {0};
char *ptr=array;
</code></pre>
<table><thead><tr><th>指令</th><th>C 代码</th></tr></thead><tbody>
<tr><td>&gt;</td><td>++ptr;</td></tr>
<tr><td>&lt;</td><td>--ptr;</td></tr>
<tr><td>+</td><td>++*ptr;</td></tr>
<tr><td>-</td><td>--*ptr;</td></tr>
<tr><td>.</td><td>putchar(*ptr);</td></tr>
<tr><td>,</td><td>*ptr=getchar();</td></tr>
<tr><td>[</td><td>while (*ptr) {</td></tr>
<tr><td>]</td><td>}</td></tr>
</tbody></table>
<p>Brainfuck 可视化</p>
<p><a href="http://fatiherikli.github.io/brainfuck-visualizer/">http://fatiherikli.github.io/brainfuck-visualizer/</a></p>
<h2><a class="header" href="#rust-资源" id="rust-资源">Rust 资源</a></h2>
<p>Rust 官网 <a href="https://www.rust-lang.org/">https://www.rust-lang.org/</a></p>
<p>Rust 一键安装 <a href="https://rustup.rs/">https://rustup.rs/</a></p>
<p>Rust 并不是一个能立即上手的语言，如果您是一位 Rust 新手，最好先全面了解 Rust 语言特性。</p>
<p>Rust 官网入门教程 <a href="https://www.rust-lang.org/zh-CN/learn">https://www.rust-lang.org/zh-CN/learn</a></p>
<p>中文书《Rust编程之道》 <a href="https://book.douban.com/subject/30418895/">https://book.douban.com/subject/30418895/</a></p>

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