1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
<!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="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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
<link rel="alternate icon" type="image/png" href="../../favicon-16x16.png">
<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></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="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../llvm_kaleidoscope_rs/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img src="../../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img src="../../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" 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">
<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="op">-</span><span class="op">></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="op">-</span><span class="op">></span> <span class="kw-2">*</span><span class="kw">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="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="self">Self</span><span class="ident">::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>());
}
}
</pre></div>
</section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="llvm_kaleidoscope_rs" data-search-index-js="../../search-index.js" data-search-js="../../search.js"></div><script src="../../main.js"></script><script src="../../source-script.js"></script><script src="../../source-files.js"></script></body></html>
|
