|
|
<!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`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><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="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../llvm_kaleidoscope_rs/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div>
</a><h2 class="location"></h2>
</nav>
<nav class="sidebar"><a class="sidebar-logo" href="../../llvm_kaleidoscope_rs/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div>
</a></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../llvm_kaleidoscope_rs/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><button type="button" id="help-button" title="help">?</button><div id="settings-menu" tabindex="-1">
<a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div>
</div></form></nav></div><section id="main-content" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">1</span>
<span id="2">2</span>
<span id="3">3</span>
<span id="4">4</span>
<span id="5">5</span>
<span id="6">6</span>
<span id="7">7</span>
<span id="8">8</span>
<span id="9">9</span>
<span id="10">10</span>
<span id="11">11</span>
<span id="12">12</span>
<span id="13">13</span>
<span id="14">14</span>
<span id="15">15</span>
<span id="16">16</span>
<span id="17">17</span>
<span id="18">18</span>
<span id="19">19</span>
<span id="20">20</span>
<span id="21">21</span>
<span id="22">22</span>
<span id="23">23</span>
<span id="24">24</span>
<span id="25">25</span>
<span id="26">26</span>
<span id="27">27</span>
<span id="28">28</span>
<span id="29">29</span>
<span id="30">30</span>
<span id="31">31</span>
<span id="32">32</span>
<span id="33">33</span>
<span id="34">34</span>
<span id="35">35</span>
<span id="36">36</span>
<span id="37">37</span>
<span id="38">38</span>
<span id="39">39</span>
<span id="40">40</span>
<span id="41">41</span>
<span id="42">42</span>
<span id="43">43</span>
<span id="44">44</span>
<span id="45">45</span>
<span id="46">46</span>
<span id="47">47</span>
<span id="48">48</span>
<span id="49">49</span>
<span id="50">50</span>
<span id="51">51</span>
<span id="52">52</span>
<span id="53">53</span>
<span id="54">54</span>
<span id="55">55</span>
<span id="56">56</span>
<span id="57">57</span>
<span id="58">58</span>
<span id="59">59</span>
<span id="60">60</span>
<span id="61">61</span>
<span id="62">62</span>
<span id="63">63</span>
<span id="64">64</span>
<span id="65">65</span>
<span id="66">66</span>
<span id="67">67</span>
<span id="68">68</span>
<span id="69">69</span>
<span id="70">70</span>
<span id="71">71</span>
<span id="72">72</span>
<span id="73">73</span>
<span id="74">74</span>
<span id="75">75</span>
<span id="76">76</span>
<span id="77">77</span>
<span id="78">78</span>
<span id="79">79</span>
<span id="80">80</span>
<span id="81">81</span>
<span id="82">82</span>
<span id="83">83</span>
<span id="84">84</span>
<span id="85">85</span>
<span id="86">86</span>
<span id="87">87</span>
<span id="88">88</span>
<span id="89">89</span>
<span id="90">90</span>
<span id="91">91</span>
<span id="92">92</span>
<span id="93">93</span>
<span id="94">94</span>
<span id="95">95</span>
<span id="96">96</span>
<span id="97">97</span>
<span id="98">98</span>
<span id="99">99</span>
<span id="100">100</span>
<span id="101">101</span>
<span id="102">102</span>
<span id="103">103</span>
<span id="104">104</span>
<span id="105">105</span>
<span id="106">106</span>
<span id="107">107</span>
<span id="108">108</span>
<span id="109">109</span>
<span id="110">110</span>
<span id="111">111</span>
</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::convert::TryFrom</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">codegen</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">lexer</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">llvm</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">parser</span>;
<span class="doccomment">/// Fixed size of [`SmallCStr`] including the trailing `\0` byte.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SMALL_STR_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">16</span>;
<span class="doccomment">/// Small C string on the stack with fixed size [`SMALL_STR_SIZE`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is specially crafted to interact with the LLVM C API and get rid of some heap allocations.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SmallCStr</span>([<span class="ident">u8</span>; <span class="ident">SMALL_STR_SIZE</span>]);
<span class="kw">impl</span> <span class="ident">SmallCStr</span> {
<span class="doccomment">/// Create a new C string from `src`.</span>
<span class="doccomment">/// Returns [`None`] if `src` exceeds the fixed size or contains any `\0` bytes.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span><span class="op">></span>(<span class="ident">src</span>: <span class="kw-2">&</span><span class="ident">T</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">SmallCStr</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="ident">src</span>.<span class="ident">as_ref</span>();
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">src</span>.<span class="ident">len</span>();
<span class="comment">// Check for \0 bytes.</span>
<span class="kw">let</span> <span class="ident">contains_null</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="op">!</span><span class="ident">libc::memchr</span>(<span class="ident">src</span>.<span class="ident">as_ptr</span>().<span class="ident">cast</span>(), <span class="number">0</span>, <span class="ident">len</span>).<span class="ident">is_null</span>() };
<span class="kw">if</span> <span class="ident">contains_null</span> <span class="op">|</span><span class="op">|</span> <span class="ident">len</span> <span class="op">></span> <span class="ident">SMALL_STR_SIZE</span> <span class="op">-</span> <span class="number">1</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dest</span> <span class="op">=</span> [<span class="number">0</span>; <span class="ident">SMALL_STR_SIZE</span>];
<span class="ident">dest</span>[..<span class="ident">len</span>].<span class="ident">copy_from_slice</span>(<span class="ident">src</span>);
<span class="prelude-val">Some</span>(<span class="ident">SmallCStr</span>(<span class="ident">dest</span>))
}
}
<span class="doccomment">/// Return pointer to C string.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">as_ptr</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">*const</span> <span class="ident">libc::c_char</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">as_ptr</span>().<span class="ident">cast</span>()
}
}
<span class="kw">impl</span> <span class="ident">TryFrom</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="kw">for</span> <span class="ident">SmallCStr</span> {
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> ();
<span class="kw">fn</span> <span class="ident">try_from</span>(<span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">></span> {
<span class="ident">SmallCStr::new</span>(<span class="kw-2">&</span><span class="ident">value</span>).<span class="ident">ok_or</span>(())
}
}
<span class="doccomment">/// Either type, for APIs accepting two types.</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Either</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span><span class="op">></span> {
<span class="ident">A</span>(<span class="ident">A</span>),
<span class="ident">B</span>(<span class="ident">B</span>),
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span> {
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">SmallCStr</span>, <span class="ident">SMALL_STR_SIZE</span>};
<span class="kw">use</span> <span class="ident">std::convert::TryInto</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_create</span>() {
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="string">"\x30\x31\x32\x33"</span>;
<span class="kw">let</span> <span class="ident">scs</span> <span class="op">=</span> <span class="ident">SmallCStr::new</span>(<span class="kw-2">&</span><span class="ident">src</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq!</span>(<span class="kw-2">&</span><span class="ident">scs</span>.<span class="number">0</span>[..<span class="number">5</span>], <span class="kw-2">&</span>[<span class="number">0x30</span>, <span class="number">0x31</span>, <span class="number">0x32</span>, <span class="number">0x33</span>, <span class="number">0x00</span>]);
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="string">b"abcd1234"</span>;
<span class="kw">let</span> <span class="ident">scs</span> <span class="op">=</span> <span class="ident">SmallCStr::new</span>(<span class="kw-2">&</span><span class="ident">src</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq!</span>(
<span class="kw-2">&</span><span class="ident">scs</span>.<span class="number">0</span>[..<span class="number">9</span>],
<span class="kw-2">&</span>[<span class="number">0x61</span>, <span class="number">0x62</span>, <span class="number">0x63</span>, <span class="number">0x64</span>, <span class="number">0x31</span>, <span class="number">0x32</span>, <span class="number">0x33</span>, <span class="number">0x34</span>, <span class="number">0x00</span>]
);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_contain_null</span>() {
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="string">"\x30\x00\x32\x33"</span>;
<span class="kw">let</span> <span class="ident">scs</span> <span class="op">=</span> <span class="ident">SmallCStr::new</span>(<span class="kw-2">&</span><span class="ident">src</span>);
<span class="macro">assert_eq!</span>(<span class="ident">scs</span>, <span class="prelude-val">None</span>);
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="string">"\x30\x31\x32\x33\x00"</span>;
<span class="kw">let</span> <span class="ident">scs</span> <span class="op">=</span> <span class="ident">SmallCStr::new</span>(<span class="kw-2">&</span><span class="ident">src</span>);
<span class="macro">assert_eq!</span>(<span class="ident">scs</span>, <span class="prelude-val">None</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_too_large</span>() {
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> (<span class="number">0</span>..<span class="ident">SMALL_STR_SIZE</span>).<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="string">'a'</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">scs</span> <span class="op">=</span> <span class="ident">SmallCStr::new</span>(<span class="kw-2">&</span><span class="ident">src</span>);
<span class="macro">assert_eq!</span>(<span class="ident">scs</span>, <span class="prelude-val">None</span>);
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> (<span class="number">0</span>..<span class="ident">SMALL_STR_SIZE</span> <span class="op">+</span> <span class="number">10</span>).<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="string">'a'</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">scs</span> <span class="op">=</span> <span class="ident">SmallCStr::new</span>(<span class="kw-2">&</span><span class="ident">src</span>);
<span class="macro">assert_eq!</span>(<span class="ident">scs</span>, <span class="prelude-val">None</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_try_into</span>() {
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="string">"\x30\x31\x32\x33"</span>;
<span class="kw">let</span> <span class="ident">scs</span>: <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">SmallCStr</span>, ()<span class="op">></span> <span class="op">=</span> <span class="ident">src</span>.<span class="ident">try_into</span>();
<span class="macro">assert!</span>(<span class="ident">scs</span>.<span class="ident">is_ok</span>());
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> (<span class="number">0</span>..<span class="ident">SMALL_STR_SIZE</span>).<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="string">'a'</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">scs</span>: <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">SmallCStr</span>, ()<span class="op">></span> <span class="op">=</span> <span class="ident">src</span>.<span class="ident">as_str</span>().<span class="ident">try_into</span>();
<span class="macro">assert!</span>(<span class="ident">scs</span>.<span class="ident">is_err</span>());
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> (<span class="number">0</span>..<span class="ident">SMALL_STR_SIZE</span> <span class="op">+</span> <span class="number">10</span>).<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="string">'a'</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">scs</span>: <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">SmallCStr</span>, ()<span class="op">></span> <span class="op">=</span> <span class="ident">src</span>.<span class="ident">as_str</span>().<span class="ident">try_into</span>();
<span class="macro">assert!</span>(<span class="ident">scs</span>.<span class="ident">is_err</span>());
}
}
</code></pre></div>
</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="llvm_kaleidoscope_rs" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.63.0 (4b91a6ea7 2022-08-08)" ></div>
</body></html>
|
