| <!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 `crates/span/src/ast_id.rs`."><title>ast_id.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="span" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.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"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">span/</div>ast_id.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! `AstIdMap` allows to create stable IDs for "large" syntax nodes like items |
| <a href=#2 id=2 data-nosnippet>2</a>//! and macro calls. |
| <a href=#3 id=3 data-nosnippet>3</a>//! |
| <a href=#4 id=4 data-nosnippet>4</a>//! Specifically, it enumerates all items in a file and uses position of a an |
| <a href=#5 id=5 data-nosnippet>5</a>//! item as an ID. That way, id's don't change unless the set of items itself |
| <a href=#6 id=6 data-nosnippet>6</a>//! changes. |
| <a href=#7 id=7 data-nosnippet>7</a>//! |
| <a href=#8 id=8 data-nosnippet>8</a>//! These IDs are tricky. If one of them invalidates, its interned ID invalidates, |
| <a href=#9 id=9 data-nosnippet>9</a>//! and this can cause *a lot* to be recomputed. For example, if you invalidate the ID |
| <a href=#10 id=10 data-nosnippet>10</a>//! of a struct, and that struct has an impl (any impl!) this will cause the `Self` |
| <a href=#11 id=11 data-nosnippet>11</a>//! type of the impl to invalidate, which will cause the all impls queries to be |
| <a href=#12 id=12 data-nosnippet>12</a>//! invalidated, which will cause every trait solve query in this crate *and* all |
| <a href=#13 id=13 data-nosnippet>13</a>//! transitive reverse dependencies to be invalidated, which is pretty much the worst |
| <a href=#14 id=14 data-nosnippet>14</a>//! thing that can happen incrementality wise. |
| <a href=#15 id=15 data-nosnippet>15</a>//! |
| <a href=#16 id=16 data-nosnippet>16</a>//! So we want these IDs to stay as stable as possible. For top-level items, we store |
| <a href=#17 id=17 data-nosnippet>17</a>//! their kind and name, which should be unique, but since they can still not be, we |
| <a href=#18 id=18 data-nosnippet>18</a>//! also store an index disambiguator. For nested items, we also store the ID of their |
| <a href=#19 id=19 data-nosnippet>19</a>//! parent. For macro calls, we store the macro name and an index. There aren't usually |
| <a href=#20 id=20 data-nosnippet>20</a>//! a lot of macro calls in item position, and invalidation in bodies is not much of |
| <a href=#21 id=21 data-nosnippet>21</a>//! a problem, so this should be enough. |
| <a href=#22 id=22 data-nosnippet>22</a> |
| <a href=#23 id=23 data-nosnippet>23</a></span><span class="kw">use </span>std::{ |
| <a href=#24 id=24 data-nosnippet>24</a> any::type_name, |
| <a href=#25 id=25 data-nosnippet>25</a> fmt, |
| <a href=#26 id=26 data-nosnippet>26</a> hash::{BuildHasher, Hash, Hasher}, |
| <a href=#27 id=27 data-nosnippet>27</a> marker::PhantomData, |
| <a href=#28 id=28 data-nosnippet>28</a>}; |
| <a href=#29 id=29 data-nosnippet>29</a> |
| <a href=#30 id=30 data-nosnippet>30</a><span class="kw">use </span>la_arena::{Arena, Idx, RawIdx}; |
| <a href=#31 id=31 data-nosnippet>31</a><span class="kw">use </span>rustc_hash::{FxBuildHasher, FxHashMap}; |
| <a href=#32 id=32 data-nosnippet>32</a><span class="kw">use </span>syntax::{ |
| <a href=#33 id=33 data-nosnippet>33</a> AstNode, AstPtr, SyntaxKind, SyntaxNode, SyntaxNodePtr, |
| <a href=#34 id=34 data-nosnippet>34</a> ast::{<span class="self">self</span>, HasName}, |
| <a href=#35 id=35 data-nosnippet>35</a> match_ast, |
| <a href=#36 id=36 data-nosnippet>36</a>}; |
| <a href=#37 id=37 data-nosnippet>37</a> |
| <a href=#38 id=38 data-nosnippet>38</a><span class="comment">// The first index is always the root node's AstId |
| <a href=#39 id=39 data-nosnippet>39</a></span><span class="doccomment">/// The root ast id always points to the encompassing file, using this in spans is discouraged as |
| <a href=#40 id=40 data-nosnippet>40</a>/// any range relative to it will be effectively absolute, ruining the entire point of anchored |
| <a href=#41 id=41 data-nosnippet>41</a>/// relative text ranges. |
| <a href=#42 id=42 data-nosnippet>42</a></span><span class="kw">pub const </span>ROOT_ERASED_FILE_AST_ID: ErasedFileAstId = |
| <a href=#43 id=43 data-nosnippet>43</a> ErasedFileAstId(pack_hash_index_and_kind(<span class="number">0</span>, <span class="number">0</span>, ErasedFileAstIdKind::Root <span class="kw">as </span>u32)); |
| <a href=#44 id=44 data-nosnippet>44</a> |
| <a href=#45 id=45 data-nosnippet>45</a><span class="doccomment">/// ErasedFileAstId used as the span for syntax node fixups. Any Span containing this file id is to be |
| <a href=#46 id=46 data-nosnippet>46</a>/// considered fake. |
| <a href=#47 id=47 data-nosnippet>47</a>/// Do not modify this, it is used by the proc-macro server. |
| <a href=#48 id=48 data-nosnippet>48</a></span><span class="kw">pub const </span>FIXUP_ERASED_FILE_AST_ID_MARKER: ErasedFileAstId = |
| <a href=#49 id=49 data-nosnippet>49</a> ErasedFileAstId(pack_hash_index_and_kind(<span class="number">0</span>, <span class="number">0</span>, ErasedFileAstIdKind::Fixup <span class="kw">as </span>u32)); |
| <a href=#50 id=50 data-nosnippet>50</a> |
| <a href=#51 id=51 data-nosnippet>51</a><span class="doccomment">/// [`ErasedFileAstId`] used as the span for syntax nodes that should not be mapped down to |
| <a href=#52 id=52 data-nosnippet>52</a>/// macro expansion. Any `Span` containing this file id is to be considered fake. |
| <a href=#53 id=53 data-nosnippet>53</a></span><span class="kw">pub const </span>NO_DOWNMAP_ERASED_FILE_AST_ID_MARKER: ErasedFileAstId = |
| <a href=#54 id=54 data-nosnippet>54</a> ErasedFileAstId(pack_hash_index_and_kind(<span class="number">0</span>, <span class="number">0</span>, ErasedFileAstIdKind::NoDownmap <span class="kw">as </span>u32)); |
| <a href=#55 id=55 data-nosnippet>55</a> |
| <a href=#56 id=56 data-nosnippet>56</a><span class="doccomment">/// This is a type erased FileAstId. |
| <a href=#57 id=57 data-nosnippet>57</a></span><span class="attr">#[derive(Clone, Copy, PartialEq, Eq, Hash)] |
| <a href=#58 id=58 data-nosnippet>58</a></span><span class="kw">pub struct </span>ErasedFileAstId(u32); |
| <a href=#59 id=59 data-nosnippet>59</a> |
| <a href=#60 id=60 data-nosnippet>60</a><span class="kw">impl </span>fmt::Debug <span class="kw">for </span>ErasedFileAstId { |
| <a href=#61 id=61 data-nosnippet>61</a> <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <a href=#62 id=62 data-nosnippet>62</a> <span class="kw">let </span>kind = <span class="self">self</span>.kind(); |
| <a href=#63 id=63 data-nosnippet>63</a> <span class="macro">macro_rules!</span> kind { |
| <a href=#64 id=64 data-nosnippet>64</a> ($(<span class="macro-nonterminal">$kind</span>:ident),* $(,)<span class="question-mark">?</span>) => { |
| <a href=#65 id=65 data-nosnippet>65</a> <span class="kw">if </span><span class="bool-val">false </span>{ |
| <a href=#66 id=66 data-nosnippet>66</a> <span class="comment">// Ensure we covered all variants. |
| <a href=#67 id=67 data-nosnippet>67</a> </span><span class="kw">match </span>ErasedFileAstIdKind::Root { |
| <a href=#68 id=68 data-nosnippet>68</a> $( ErasedFileAstIdKind::<span class="macro-nonterminal">$kind </span>=> {} )* |
| <a href=#69 id=69 data-nosnippet>69</a> } |
| <a href=#70 id=70 data-nosnippet>70</a> <span class="macro">unreachable!</span>() |
| <a href=#71 id=71 data-nosnippet>71</a> } |
| <a href=#72 id=72 data-nosnippet>72</a> $( <span class="kw">else if </span>kind == ErasedFileAstIdKind::<span class="macro-nonterminal">$kind </span><span class="kw">as </span>u32 { |
| <a href=#73 id=73 data-nosnippet>73</a> <span class="macro">stringify!</span>(<span class="macro-nonterminal">$kind</span>) |
| <a href=#74 id=74 data-nosnippet>74</a> } )* |
| <a href=#75 id=75 data-nosnippet>75</a> <span class="kw">else </span>{ |
| <a href=#76 id=76 data-nosnippet>76</a> <span class="string">"Unknown" |
| <a href=#77 id=77 data-nosnippet>77</a> </span>} |
| <a href=#78 id=78 data-nosnippet>78</a> }; |
| <a href=#79 id=79 data-nosnippet>79</a> } |
| <a href=#80 id=80 data-nosnippet>80</a> <span class="kw">let </span>kind = <span class="macro">kind!</span>( |
| <a href=#81 id=81 data-nosnippet>81</a> Root, |
| <a href=#82 id=82 data-nosnippet>82</a> Enum, |
| <a href=#83 id=83 data-nosnippet>83</a> Struct, |
| <a href=#84 id=84 data-nosnippet>84</a> Union, |
| <a href=#85 id=85 data-nosnippet>85</a> ExternCrate, |
| <a href=#86 id=86 data-nosnippet>86</a> MacroDef, |
| <a href=#87 id=87 data-nosnippet>87</a> MacroRules, |
| <a href=#88 id=88 data-nosnippet>88</a> Module, |
| <a href=#89 id=89 data-nosnippet>89</a> Static, |
| <a href=#90 id=90 data-nosnippet>90</a> Trait, |
| <a href=#91 id=91 data-nosnippet>91</a> Variant, |
| <a href=#92 id=92 data-nosnippet>92</a> Const, |
| <a href=#93 id=93 data-nosnippet>93</a> Fn, |
| <a href=#94 id=94 data-nosnippet>94</a> MacroCall, |
| <a href=#95 id=95 data-nosnippet>95</a> TypeAlias, |
| <a href=#96 id=96 data-nosnippet>96</a> ExternBlock, |
| <a href=#97 id=97 data-nosnippet>97</a> Use, |
| <a href=#98 id=98 data-nosnippet>98</a> Impl, |
| <a href=#99 id=99 data-nosnippet>99</a> BlockExpr, |
| <a href=#100 id=100 data-nosnippet>100</a> AsmExpr, |
| <a href=#101 id=101 data-nosnippet>101</a> Fixup, |
| <a href=#102 id=102 data-nosnippet>102</a> NoDownmap, |
| <a href=#103 id=103 data-nosnippet>103</a> ); |
| <a href=#104 id=104 data-nosnippet>104</a> <span class="kw">if </span>f.alternate() { |
| <a href=#105 id=105 data-nosnippet>105</a> <span class="macro">write!</span>(f, <span class="string">"{kind}[{:04X}, {}]"</span>, <span class="self">self</span>.hash_value(), <span class="self">self</span>.index()) |
| <a href=#106 id=106 data-nosnippet>106</a> } <span class="kw">else </span>{ |
| <a href=#107 id=107 data-nosnippet>107</a> f.debug_struct(<span class="string">"ErasedFileAstId"</span>) |
| <a href=#108 id=108 data-nosnippet>108</a> .field(<span class="string">"kind"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{kind}"</span>)) |
| <a href=#109 id=109 data-nosnippet>109</a> .field(<span class="string">"index"</span>, <span class="kw-2">&</span><span class="self">self</span>.index()) |
| <a href=#110 id=110 data-nosnippet>110</a> .field(<span class="string">"hash"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{:04X}"</span>, <span class="self">self</span>.hash_value())) |
| <a href=#111 id=111 data-nosnippet>111</a> .finish() |
| <a href=#112 id=112 data-nosnippet>112</a> } |
| <a href=#113 id=113 data-nosnippet>113</a> } |
| <a href=#114 id=114 data-nosnippet>114</a>} |
| <a href=#115 id=115 data-nosnippet>115</a> |
| <a href=#116 id=116 data-nosnippet>116</a><span class="attr">#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)] |
| <a href=#117 id=117 data-nosnippet>117</a>#[repr(u8)] |
| <a href=#118 id=118 data-nosnippet>118</a></span><span class="kw">enum </span>ErasedFileAstIdKind { |
| <a href=#119 id=119 data-nosnippet>119</a> <span class="doccomment">/// This needs to not change because it's depended upon by the proc macro server. |
| <a href=#120 id=120 data-nosnippet>120</a> </span>Fixup = <span class="number">0</span>, |
| <a href=#121 id=121 data-nosnippet>121</a> <span class="comment">// The following are associated with `ErasedHasNameFileAstId`. |
| <a href=#122 id=122 data-nosnippet>122</a> </span>Enum, |
| <a href=#123 id=123 data-nosnippet>123</a> Struct, |
| <a href=#124 id=124 data-nosnippet>124</a> Union, |
| <a href=#125 id=125 data-nosnippet>125</a> ExternCrate, |
| <a href=#126 id=126 data-nosnippet>126</a> MacroDef, |
| <a href=#127 id=127 data-nosnippet>127</a> MacroRules, |
| <a href=#128 id=128 data-nosnippet>128</a> Module, |
| <a href=#129 id=129 data-nosnippet>129</a> Static, |
| <a href=#130 id=130 data-nosnippet>130</a> Trait, |
| <a href=#131 id=131 data-nosnippet>131</a> <span class="comment">// Until here associated with `ErasedHasNameFileAstId`. |
| <a href=#132 id=132 data-nosnippet>132</a> // The following are associated with `ErasedAssocItemFileAstId`. |
| <a href=#133 id=133 data-nosnippet>133</a> </span>Variant, |
| <a href=#134 id=134 data-nosnippet>134</a> Const, |
| <a href=#135 id=135 data-nosnippet>135</a> Fn, |
| <a href=#136 id=136 data-nosnippet>136</a> MacroCall, |
| <a href=#137 id=137 data-nosnippet>137</a> TypeAlias, |
| <a href=#138 id=138 data-nosnippet>138</a> <span class="comment">// Until here associated with `ErasedAssocItemFileAstId`. |
| <a href=#139 id=139 data-nosnippet>139</a> // Extern blocks don't really have any identifying property unfortunately. |
| <a href=#140 id=140 data-nosnippet>140</a> </span>ExternBlock, |
| <a href=#141 id=141 data-nosnippet>141</a> <span class="comment">// FIXME: If we store the final `UseTree` instead of the top-level `Use`, we can store its name, |
| <a href=#142 id=142 data-nosnippet>142</a> // and be way more granular for incrementality, at the expense of increased memory usage. |
| <a href=#143 id=143 data-nosnippet>143</a> // Use IDs aren't used a lot. The main thing that stores them is the def map. So everything that |
| <a href=#144 id=144 data-nosnippet>144</a> // uses the def map will be invalidated. That includes infers, and so is pretty bad, but our |
| <a href=#145 id=145 data-nosnippet>145</a> // def map incrementality story is pretty bad anyway and needs to be improved (see |
| <a href=#146 id=146 data-nosnippet>146</a> // https://rust-lang.zulipchat.com/#narrow/channel/185405-t-compiler.2Frust-analyzer/topic/.60infer.60.20queries.20and.20splitting.20.60DefMap.60). |
| <a href=#147 id=147 data-nosnippet>147</a> // So I left this as-is for now, as the def map improvement should also mitigate this. |
| <a href=#148 id=148 data-nosnippet>148</a> </span>Use, |
| <a href=#149 id=149 data-nosnippet>149</a> <span class="doccomment">/// Associated with [`ImplFileAstId`]. |
| <a href=#150 id=150 data-nosnippet>150</a> </span>Impl, |
| <a href=#151 id=151 data-nosnippet>151</a> <span class="doccomment">/// Associated with [`BlockExprFileAstId`]. |
| <a href=#152 id=152 data-nosnippet>152</a> </span>BlockExpr, |
| <a href=#153 id=153 data-nosnippet>153</a> <span class="comment">// `global_asm!()` is an item, so we need to give it an `AstId`. So we give to all inline asm |
| <a href=#154 id=154 data-nosnippet>154</a> // because incrementality is not a problem, they will always be the only item in the macro file, |
| <a href=#155 id=155 data-nosnippet>155</a> // and memory usage also not because they're rare. |
| <a href=#156 id=156 data-nosnippet>156</a> </span>AsmExpr, |
| <a href=#157 id=157 data-nosnippet>157</a> <span class="doccomment">/// Represents a fake [`ErasedFileAstId`] that should not be mapped down to macro expansion |
| <a href=#158 id=158 data-nosnippet>158</a> /// result. |
| <a href=#159 id=159 data-nosnippet>159</a> </span>NoDownmap, |
| <a href=#160 id=160 data-nosnippet>160</a> <span class="doccomment">/// Keep this last. |
| <a href=#161 id=161 data-nosnippet>161</a> </span>Root, |
| <a href=#162 id=162 data-nosnippet>162</a>} |
| <a href=#163 id=163 data-nosnippet>163</a> |
| <a href=#164 id=164 data-nosnippet>164</a><span class="comment">// First hash, then index, then kind. |
| <a href=#165 id=165 data-nosnippet>165</a></span><span class="kw">const </span>HASH_BITS: u32 = <span class="number">16</span>; |
| <a href=#166 id=166 data-nosnippet>166</a><span class="kw">const </span>INDEX_BITS: u32 = <span class="number">11</span>; |
| <a href=#167 id=167 data-nosnippet>167</a><span class="kw">const </span>KIND_BITS: u32 = <span class="number">5</span>; |
| <a href=#168 id=168 data-nosnippet>168</a><span class="kw">const _</span>: () = <span class="macro">assert!</span>(ErasedFileAstIdKind::Root <span class="kw">as </span>u32 <= ((<span class="number">1 </span><< KIND_BITS) - <span class="number">1</span>)); |
| <a href=#169 id=169 data-nosnippet>169</a><span class="kw">const _</span>: () = <span class="macro">assert!</span>(HASH_BITS + INDEX_BITS + KIND_BITS == u32::BITS); |
| <a href=#170 id=170 data-nosnippet>170</a> |
| <a href=#171 id=171 data-nosnippet>171</a><span class="attr">#[inline] |
| <a href=#172 id=172 data-nosnippet>172</a></span><span class="kw">const fn </span>u16_hash(hash: u64) -> u16 { |
| <a href=#173 id=173 data-nosnippet>173</a> <span class="comment">// We do basically the same as `FxHasher`. We don't use rustc-hash and truncate because the |
| <a href=#174 id=174 data-nosnippet>174</a> // higher bits have more entropy, but unlike rustc-hash we don't rotate because it rotates |
| <a href=#175 id=175 data-nosnippet>175</a> // for hashmaps that just use the low bits, but we compare all bits. |
| <a href=#176 id=176 data-nosnippet>176</a> </span><span class="kw">const </span>K: u16 = <span class="number">0xecc5</span>; |
| <a href=#177 id=177 data-nosnippet>177</a> <span class="kw">let </span>(part1, part2, part3, part4) = |
| <a href=#178 id=178 data-nosnippet>178</a> (hash <span class="kw">as </span>u16, (hash >> <span class="number">16</span>) <span class="kw">as </span>u16, (hash >> <span class="number">32</span>) <span class="kw">as </span>u16, (hash >> <span class="number">48</span>) <span class="kw">as </span>u16); |
| <a href=#179 id=179 data-nosnippet>179</a> part1 |
| <a href=#180 id=180 data-nosnippet>180</a> .wrapping_add(part2) |
| <a href=#181 id=181 data-nosnippet>181</a> .wrapping_mul(K) |
| <a href=#182 id=182 data-nosnippet>182</a> .wrapping_add(part3) |
| <a href=#183 id=183 data-nosnippet>183</a> .wrapping_mul(K) |
| <a href=#184 id=184 data-nosnippet>184</a> .wrapping_add(part4) |
| <a href=#185 id=185 data-nosnippet>185</a> .wrapping_mul(K) |
| <a href=#186 id=186 data-nosnippet>186</a>} |
| <a href=#187 id=187 data-nosnippet>187</a> |
| <a href=#188 id=188 data-nosnippet>188</a><span class="attr">#[inline] |
| <a href=#189 id=189 data-nosnippet>189</a></span><span class="kw">const fn </span>pack_hash_index_and_kind(hash: u16, index: u32, kind: u32) -> u32 { |
| <a href=#190 id=190 data-nosnippet>190</a> (hash <span class="kw">as </span>u32) | (index << HASH_BITS) | (kind << (HASH_BITS + INDEX_BITS)) |
| <a href=#191 id=191 data-nosnippet>191</a>} |
| <a href=#192 id=192 data-nosnippet>192</a> |
| <a href=#193 id=193 data-nosnippet>193</a><span class="kw">impl </span>ErasedFileAstId { |
| <a href=#194 id=194 data-nosnippet>194</a> <span class="attr">#[inline] |
| <a href=#195 id=195 data-nosnippet>195</a> </span><span class="kw">fn </span>hash_value(<span class="self">self</span>) -> u16 { |
| <a href=#196 id=196 data-nosnippet>196</a> <span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>u16 |
| <a href=#197 id=197 data-nosnippet>197</a> } |
| <a href=#198 id=198 data-nosnippet>198</a> |
| <a href=#199 id=199 data-nosnippet>199</a> <span class="attr">#[inline] |
| <a href=#200 id=200 data-nosnippet>200</a> </span><span class="kw">fn </span>index(<span class="self">self</span>) -> u32 { |
| <a href=#201 id=201 data-nosnippet>201</a> (<span class="self">self</span>.<span class="number">0 </span><< KIND_BITS) >> (HASH_BITS + KIND_BITS) |
| <a href=#202 id=202 data-nosnippet>202</a> } |
| <a href=#203 id=203 data-nosnippet>203</a> |
| <a href=#204 id=204 data-nosnippet>204</a> <span class="attr">#[inline] |
| <a href=#205 id=205 data-nosnippet>205</a> </span><span class="kw">fn </span>kind(<span class="self">self</span>) -> u32 { |
| <a href=#206 id=206 data-nosnippet>206</a> <span class="self">self</span>.<span class="number">0 </span>>> (HASH_BITS + INDEX_BITS) |
| <a href=#207 id=207 data-nosnippet>207</a> } |
| <a href=#208 id=208 data-nosnippet>208</a> |
| <a href=#209 id=209 data-nosnippet>209</a> <span class="kw">fn </span>ast_id_for( |
| <a href=#210 id=210 data-nosnippet>210</a> node: <span class="kw-2">&</span>SyntaxNode, |
| <a href=#211 id=211 data-nosnippet>211</a> index_map: <span class="kw-2">&mut </span>ErasedAstIdNextIndexMap, |
| <a href=#212 id=212 data-nosnippet>212</a> parent: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>ErasedFileAstId>, |
| <a href=#213 id=213 data-nosnippet>213</a> ) -> <span class="prelude-ty">Option</span><ErasedFileAstId> { |
| <a href=#214 id=214 data-nosnippet>214</a> <span class="comment">// Blocks are deliberately not here - we only want to allocate a block if it contains items. |
| <a href=#215 id=215 data-nosnippet>215</a> </span>has_name_ast_id(node, index_map) |
| <a href=#216 id=216 data-nosnippet>216</a> .or_else(|| assoc_item_ast_id(node, index_map, parent)) |
| <a href=#217 id=217 data-nosnippet>217</a> .or_else(|| extern_block_ast_id(node, index_map)) |
| <a href=#218 id=218 data-nosnippet>218</a> .or_else(|| use_ast_id(node, index_map)) |
| <a href=#219 id=219 data-nosnippet>219</a> .or_else(|| impl_ast_id(node, index_map)) |
| <a href=#220 id=220 data-nosnippet>220</a> .or_else(|| asm_expr_ast_id(node, index_map)) |
| <a href=#221 id=221 data-nosnippet>221</a> } |
| <a href=#222 id=222 data-nosnippet>222</a> |
| <a href=#223 id=223 data-nosnippet>223</a> <span class="kw">fn </span>should_alloc(node: <span class="kw-2">&</span>SyntaxNode) -> bool { |
| <a href=#224 id=224 data-nosnippet>224</a> <span class="kw">let </span>kind = node.kind(); |
| <a href=#225 id=225 data-nosnippet>225</a> should_alloc_has_name(kind) |
| <a href=#226 id=226 data-nosnippet>226</a> || should_alloc_assoc_item(kind) |
| <a href=#227 id=227 data-nosnippet>227</a> || ast::ExternBlock::can_cast(kind) |
| <a href=#228 id=228 data-nosnippet>228</a> || ast::Use::can_cast(kind) |
| <a href=#229 id=229 data-nosnippet>229</a> || ast::Impl::can_cast(kind) |
| <a href=#230 id=230 data-nosnippet>230</a> || ast::AsmExpr::can_cast(kind) |
| <a href=#231 id=231 data-nosnippet>231</a> } |
| <a href=#232 id=232 data-nosnippet>232</a> |
| <a href=#233 id=233 data-nosnippet>233</a> <span class="attr">#[inline] |
| <a href=#234 id=234 data-nosnippet>234</a> </span><span class="kw">pub fn </span>into_raw(<span class="self">self</span>) -> u32 { |
| <a href=#235 id=235 data-nosnippet>235</a> <span class="self">self</span>.<span class="number">0 |
| <a href=#236 id=236 data-nosnippet>236</a> </span>} |
| <a href=#237 id=237 data-nosnippet>237</a> |
| <a href=#238 id=238 data-nosnippet>238</a> <span class="attr">#[inline] |
| <a href=#239 id=239 data-nosnippet>239</a> </span><span class="kw">pub const fn </span>from_raw(v: u32) -> <span class="self">Self </span>{ |
| <a href=#240 id=240 data-nosnippet>240</a> <span class="self">Self</span>(v) |
| <a href=#241 id=241 data-nosnippet>241</a> } |
| <a href=#242 id=242 data-nosnippet>242</a>} |
| <a href=#243 id=243 data-nosnippet>243</a> |
| <a href=#244 id=244 data-nosnippet>244</a><span class="kw">pub trait </span>AstIdNode: AstNode {} |
| <a href=#245 id=245 data-nosnippet>245</a> |
| <a href=#246 id=246 data-nosnippet>246</a><span class="doccomment">/// `AstId` points to an AST node in a specific file. |
| <a href=#247 id=247 data-nosnippet>247</a></span><span class="kw">pub struct </span>FileAstId<N> { |
| <a href=#248 id=248 data-nosnippet>248</a> raw: ErasedFileAstId, |
| <a href=#249 id=249 data-nosnippet>249</a> _marker: PhantomData<<span class="kw">fn</span>() -> N>, |
| <a href=#250 id=250 data-nosnippet>250</a>} |
| <a href=#251 id=251 data-nosnippet>251</a> |
| <a href=#252 id=252 data-nosnippet>252</a><span class="doccomment">/// Traits are manually implemented because `derive` adds redundant bounds. |
| <a href=#253 id=253 data-nosnippet>253</a></span><span class="kw">impl</span><N> Clone <span class="kw">for </span>FileAstId<N> { |
| <a href=#254 id=254 data-nosnippet>254</a> <span class="attr">#[inline] |
| <a href=#255 id=255 data-nosnippet>255</a> </span><span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> FileAstId<N> { |
| <a href=#256 id=256 data-nosnippet>256</a> <span class="kw-2">*</span><span class="self">self |
| <a href=#257 id=257 data-nosnippet>257</a> </span>} |
| <a href=#258 id=258 data-nosnippet>258</a>} |
| <a href=#259 id=259 data-nosnippet>259</a><span class="kw">impl</span><N> Copy <span class="kw">for </span>FileAstId<N> {} |
| <a href=#260 id=260 data-nosnippet>260</a> |
| <a href=#261 id=261 data-nosnippet>261</a><span class="kw">impl</span><N> PartialEq <span class="kw">for </span>FileAstId<N> { |
| <a href=#262 id=262 data-nosnippet>262</a> <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <a href=#263 id=263 data-nosnippet>263</a> <span class="self">self</span>.raw == other.raw |
| <a href=#264 id=264 data-nosnippet>264</a> } |
| <a href=#265 id=265 data-nosnippet>265</a>} |
| <a href=#266 id=266 data-nosnippet>266</a><span class="kw">impl</span><N> Eq <span class="kw">for </span>FileAstId<N> {} |
| <a href=#267 id=267 data-nosnippet>267</a><span class="kw">impl</span><N> Hash <span class="kw">for </span>FileAstId<N> { |
| <a href=#268 id=268 data-nosnippet>268</a> <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, hasher: <span class="kw-2">&mut </span>H) { |
| <a href=#269 id=269 data-nosnippet>269</a> <span class="self">self</span>.raw.hash(hasher); |
| <a href=#270 id=270 data-nosnippet>270</a> } |
| <a href=#271 id=271 data-nosnippet>271</a>} |
| <a href=#272 id=272 data-nosnippet>272</a> |
| <a href=#273 id=273 data-nosnippet>273</a><span class="kw">impl</span><N> fmt::Debug <span class="kw">for </span>FileAstId<N> { |
| <a href=#274 id=274 data-nosnippet>274</a> <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <a href=#275 id=275 data-nosnippet>275</a> <span class="macro">write!</span>(f, <span class="string">"FileAstId::<{}>({:?})"</span>, type_name::<N>(), <span class="self">self</span>.raw) |
| <a href=#276 id=276 data-nosnippet>276</a> } |
| <a href=#277 id=277 data-nosnippet>277</a>} |
| <a href=#278 id=278 data-nosnippet>278</a> |
| <a href=#279 id=279 data-nosnippet>279</a><span class="kw">impl</span><N> FileAstId<N> { |
| <a href=#280 id=280 data-nosnippet>280</a> <span class="comment">// Can't make this a From implementation because of coherence |
| <a href=#281 id=281 data-nosnippet>281</a> </span><span class="attr">#[inline] |
| <a href=#282 id=282 data-nosnippet>282</a> </span><span class="kw">pub fn </span>upcast<M: AstIdNode>(<span class="self">self</span>) -> FileAstId<M> |
| <a href=#283 id=283 data-nosnippet>283</a> <span class="kw">where |
| <a href=#284 id=284 data-nosnippet>284</a> </span>N: Into<M>, |
| <a href=#285 id=285 data-nosnippet>285</a> { |
| <a href=#286 id=286 data-nosnippet>286</a> FileAstId { raw: <span class="self">self</span>.raw, _marker: PhantomData } |
| <a href=#287 id=287 data-nosnippet>287</a> } |
| <a href=#288 id=288 data-nosnippet>288</a> |
| <a href=#289 id=289 data-nosnippet>289</a> <span class="attr">#[inline] |
| <a href=#290 id=290 data-nosnippet>290</a> </span><span class="kw">pub fn </span>erase(<span class="self">self</span>) -> ErasedFileAstId { |
| <a href=#291 id=291 data-nosnippet>291</a> <span class="self">self</span>.raw |
| <a href=#292 id=292 data-nosnippet>292</a> } |
| <a href=#293 id=293 data-nosnippet>293</a>} |
| <a href=#294 id=294 data-nosnippet>294</a> |
| <a href=#295 id=295 data-nosnippet>295</a><span class="attr">#[derive(Hash)] |
| <a href=#296 id=296 data-nosnippet>296</a></span><span class="kw">struct </span>ErasedHasNameFileAstId<<span class="lifetime">'a</span>> { |
| <a href=#297 id=297 data-nosnippet>297</a> name: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| <a href=#298 id=298 data-nosnippet>298</a>} |
| <a href=#299 id=299 data-nosnippet>299</a> |
| <a href=#300 id=300 data-nosnippet>300</a><span class="doccomment">/// This holds the ast ID for variants too (they're a kind of assoc item). |
| <a href=#301 id=301 data-nosnippet>301</a></span><span class="attr">#[derive(Hash)] |
| <a href=#302 id=302 data-nosnippet>302</a></span><span class="kw">struct </span>ErasedAssocItemFileAstId<<span class="lifetime">'a</span>> { |
| <a href=#303 id=303 data-nosnippet>303</a> <span class="doccomment">/// Subtle: items in `extern` blocks **do not** store the ID of the extern block here. |
| <a href=#304 id=304 data-nosnippet>304</a> /// Instead this is left empty. The reason is that `ExternBlockFileAstId` is pretty unstable |
| <a href=#305 id=305 data-nosnippet>305</a> /// (it contains only an index), and extern blocks don't introduce a new scope, so storing |
| <a href=#306 id=306 data-nosnippet>306</a> /// the extern block ID will do more harm to incrementality than help. |
| <a href=#307 id=307 data-nosnippet>307</a> </span>parent: <span class="prelude-ty">Option</span><ErasedFileAstId>, |
| <a href=#308 id=308 data-nosnippet>308</a> properties: ErasedHasNameFileAstId<<span class="lifetime">'a</span>>, |
| <a href=#309 id=309 data-nosnippet>309</a>} |
| <a href=#310 id=310 data-nosnippet>310</a> |
| <a href=#311 id=311 data-nosnippet>311</a><span class="attr">#[derive(Debug, Clone, PartialEq, Eq, Hash)] |
| <a href=#312 id=312 data-nosnippet>312</a></span><span class="kw">struct </span>ImplFileAstId<<span class="lifetime">'a</span>> { |
| <a href=#313 id=313 data-nosnippet>313</a> <span class="doccomment">/// This can be `None` if the `Self` type is not a named type, or if it is inside a macro call. |
| <a href=#314 id=314 data-nosnippet>314</a> </span>self_ty_name: <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str>, |
| <a href=#315 id=315 data-nosnippet>315</a> <span class="doccomment">/// This can be `None` if this is an inherent impl, or if the trait name is inside a macro call. |
| <a href=#316 id=316 data-nosnippet>316</a> </span>trait_name: <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str>, |
| <a href=#317 id=317 data-nosnippet>317</a>} |
| <a href=#318 id=318 data-nosnippet>318</a> |
| <a href=#319 id=319 data-nosnippet>319</a><span class="attr">#[derive(Debug, Clone, PartialEq, Eq, Hash)] |
| <a href=#320 id=320 data-nosnippet>320</a></span><span class="kw">struct </span>BlockExprFileAstId { |
| <a href=#321 id=321 data-nosnippet>321</a> parent: <span class="prelude-ty">Option</span><ErasedFileAstId>, |
| <a href=#322 id=322 data-nosnippet>322</a>} |
| <a href=#323 id=323 data-nosnippet>323</a> |
| <a href=#324 id=324 data-nosnippet>324</a><span class="kw">impl </span>AstIdNode <span class="kw">for </span>ast::ExternBlock {} |
| <a href=#325 id=325 data-nosnippet>325</a> |
| <a href=#326 id=326 data-nosnippet>326</a><span class="kw">fn </span>extern_block_ast_id( |
| <a href=#327 id=327 data-nosnippet>327</a> node: <span class="kw-2">&</span>SyntaxNode, |
| <a href=#328 id=328 data-nosnippet>328</a> index_map: <span class="kw-2">&mut </span>ErasedAstIdNextIndexMap, |
| <a href=#329 id=329 data-nosnippet>329</a>) -> <span class="prelude-ty">Option</span><ErasedFileAstId> { |
| <a href=#330 id=330 data-nosnippet>330</a> <span class="kw">if </span>ast::ExternBlock::can_cast(node.kind()) { |
| <a href=#331 id=331 data-nosnippet>331</a> <span class="prelude-val">Some</span>(index_map.new_id(ErasedFileAstIdKind::ExternBlock, ())) |
| <a href=#332 id=332 data-nosnippet>332</a> } <span class="kw">else </span>{ |
| <a href=#333 id=333 data-nosnippet>333</a> <span class="prelude-val">None |
| <a href=#334 id=334 data-nosnippet>334</a> </span>} |
| <a href=#335 id=335 data-nosnippet>335</a>} |
| <a href=#336 id=336 data-nosnippet>336</a> |
| <a href=#337 id=337 data-nosnippet>337</a><span class="kw">impl </span>AstIdNode <span class="kw">for </span>ast::Use {} |
| <a href=#338 id=338 data-nosnippet>338</a> |
| <a href=#339 id=339 data-nosnippet>339</a><span class="kw">fn </span>use_ast_id( |
| <a href=#340 id=340 data-nosnippet>340</a> node: <span class="kw-2">&</span>SyntaxNode, |
| <a href=#341 id=341 data-nosnippet>341</a> index_map: <span class="kw-2">&mut </span>ErasedAstIdNextIndexMap, |
| <a href=#342 id=342 data-nosnippet>342</a>) -> <span class="prelude-ty">Option</span><ErasedFileAstId> { |
| <a href=#343 id=343 data-nosnippet>343</a> <span class="kw">if </span>ast::Use::can_cast(node.kind()) { |
| <a href=#344 id=344 data-nosnippet>344</a> <span class="prelude-val">Some</span>(index_map.new_id(ErasedFileAstIdKind::Use, ())) |
| <a href=#345 id=345 data-nosnippet>345</a> } <span class="kw">else </span>{ |
| <a href=#346 id=346 data-nosnippet>346</a> <span class="prelude-val">None |
| <a href=#347 id=347 data-nosnippet>347</a> </span>} |
| <a href=#348 id=348 data-nosnippet>348</a>} |
| <a href=#349 id=349 data-nosnippet>349</a> |
| <a href=#350 id=350 data-nosnippet>350</a><span class="kw">impl </span>AstIdNode <span class="kw">for </span>ast::AsmExpr {} |
| <a href=#351 id=351 data-nosnippet>351</a> |
| <a href=#352 id=352 data-nosnippet>352</a><span class="kw">fn </span>asm_expr_ast_id( |
| <a href=#353 id=353 data-nosnippet>353</a> node: <span class="kw-2">&</span>SyntaxNode, |
| <a href=#354 id=354 data-nosnippet>354</a> index_map: <span class="kw-2">&mut </span>ErasedAstIdNextIndexMap, |
| <a href=#355 id=355 data-nosnippet>355</a>) -> <span class="prelude-ty">Option</span><ErasedFileAstId> { |
| <a href=#356 id=356 data-nosnippet>356</a> <span class="kw">if </span>ast::AsmExpr::can_cast(node.kind()) { |
| <a href=#357 id=357 data-nosnippet>357</a> <span class="prelude-val">Some</span>(index_map.new_id(ErasedFileAstIdKind::AsmExpr, ())) |
| <a href=#358 id=358 data-nosnippet>358</a> } <span class="kw">else </span>{ |
| <a href=#359 id=359 data-nosnippet>359</a> <span class="prelude-val">None |
| <a href=#360 id=360 data-nosnippet>360</a> </span>} |
| <a href=#361 id=361 data-nosnippet>361</a>} |
| <a href=#362 id=362 data-nosnippet>362</a> |
| <a href=#363 id=363 data-nosnippet>363</a><span class="kw">impl </span>AstIdNode <span class="kw">for </span>ast::Impl {} |
| <a href=#364 id=364 data-nosnippet>364</a> |
| <a href=#365 id=365 data-nosnippet>365</a><span class="kw">fn </span>impl_ast_id( |
| <a href=#366 id=366 data-nosnippet>366</a> node: <span class="kw-2">&</span>SyntaxNode, |
| <a href=#367 id=367 data-nosnippet>367</a> index_map: <span class="kw-2">&mut </span>ErasedAstIdNextIndexMap, |
| <a href=#368 id=368 data-nosnippet>368</a>) -> <span class="prelude-ty">Option</span><ErasedFileAstId> { |
| <a href=#369 id=369 data-nosnippet>369</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(node) = ast::Impl::cast(node.clone()) { |
| <a href=#370 id=370 data-nosnippet>370</a> <span class="kw">let </span>type_as_name = |ty: <span class="prelude-ty">Option</span><ast::Type>| <span class="kw">match </span>ty<span class="question-mark">? </span>{ |
| <a href=#371 id=371 data-nosnippet>371</a> ast::Type::PathType(it) => <span class="prelude-val">Some</span>(it.path()<span class="question-mark">?</span>.segment()<span class="question-mark">?</span>.name_ref()<span class="question-mark">?</span>), |
| <a href=#372 id=372 data-nosnippet>372</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| <a href=#373 id=373 data-nosnippet>373</a> }; |
| <a href=#374 id=374 data-nosnippet>374</a> <span class="kw">let </span>self_ty_name = type_as_name(node.self_ty()); |
| <a href=#375 id=375 data-nosnippet>375</a> <span class="kw">let </span>trait_name = type_as_name(node.trait_()); |
| <a href=#376 id=376 data-nosnippet>376</a> <span class="kw">let </span>data = ImplFileAstId { |
| <a href=#377 id=377 data-nosnippet>377</a> self_ty_name: self_ty_name.as_ref().map(|it| it.text_non_mutable()), |
| <a href=#378 id=378 data-nosnippet>378</a> trait_name: trait_name.as_ref().map(|it| it.text_non_mutable()), |
| <a href=#379 id=379 data-nosnippet>379</a> }; |
| <a href=#380 id=380 data-nosnippet>380</a> <span class="prelude-val">Some</span>(index_map.new_id(ErasedFileAstIdKind::Impl, data)) |
| <a href=#381 id=381 data-nosnippet>381</a> } <span class="kw">else </span>{ |
| <a href=#382 id=382 data-nosnippet>382</a> <span class="prelude-val">None |
| <a href=#383 id=383 data-nosnippet>383</a> </span>} |
| <a href=#384 id=384 data-nosnippet>384</a>} |
| <a href=#385 id=385 data-nosnippet>385</a> |
| <a href=#386 id=386 data-nosnippet>386</a><span class="comment">// Blocks aren't `AstIdNode`s deliberately, because unlike other nodes, not all blocks get their own |
| <a href=#387 id=387 data-nosnippet>387</a>// ast id, only if they have items. To account for that we have a different, fallible, API for blocks. |
| <a href=#388 id=388 data-nosnippet>388</a>// impl !AstIdNode for ast::BlockExpr {} |
| <a href=#389 id=389 data-nosnippet>389</a> |
| <a href=#390 id=390 data-nosnippet>390</a></span><span class="kw">fn </span>block_expr_ast_id( |
| <a href=#391 id=391 data-nosnippet>391</a> node: <span class="kw-2">&</span>SyntaxNode, |
| <a href=#392 id=392 data-nosnippet>392</a> index_map: <span class="kw-2">&mut </span>ErasedAstIdNextIndexMap, |
| <a href=#393 id=393 data-nosnippet>393</a> parent: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>ErasedFileAstId>, |
| <a href=#394 id=394 data-nosnippet>394</a>) -> <span class="prelude-ty">Option</span><ErasedFileAstId> { |
| <a href=#395 id=395 data-nosnippet>395</a> <span class="kw">if </span>ast::BlockExpr::can_cast(node.kind()) { |
| <a href=#396 id=396 data-nosnippet>396</a> <span class="prelude-val">Some</span>( |
| <a href=#397 id=397 data-nosnippet>397</a> index_map.new_id( |
| <a href=#398 id=398 data-nosnippet>398</a> ErasedFileAstIdKind::BlockExpr, |
| <a href=#399 id=399 data-nosnippet>399</a> BlockExprFileAstId { parent: parent.copied() }, |
| <a href=#400 id=400 data-nosnippet>400</a> ), |
| <a href=#401 id=401 data-nosnippet>401</a> ) |
| <a href=#402 id=402 data-nosnippet>402</a> } <span class="kw">else </span>{ |
| <a href=#403 id=403 data-nosnippet>403</a> <span class="prelude-val">None |
| <a href=#404 id=404 data-nosnippet>404</a> </span>} |
| <a href=#405 id=405 data-nosnippet>405</a>} |
| <a href=#406 id=406 data-nosnippet>406</a> |
| <a href=#407 id=407 data-nosnippet>407</a><span class="attr">#[derive(Default)] |
| <a href=#408 id=408 data-nosnippet>408</a></span><span class="kw">struct </span>ErasedAstIdNextIndexMap(FxHashMap<(ErasedFileAstIdKind, u16), u32>); |
| <a href=#409 id=409 data-nosnippet>409</a> |
| <a href=#410 id=410 data-nosnippet>410</a><span class="kw">impl </span>ErasedAstIdNextIndexMap { |
| <a href=#411 id=411 data-nosnippet>411</a> <span class="attr">#[inline] |
| <a href=#412 id=412 data-nosnippet>412</a> </span><span class="kw">fn </span>new_id(<span class="kw-2">&mut </span><span class="self">self</span>, kind: ErasedFileAstIdKind, data: <span class="kw">impl </span>Hash) -> ErasedFileAstId { |
| <a href=#413 id=413 data-nosnippet>413</a> <span class="kw">let </span>hash = FxBuildHasher.hash_one(<span class="kw-2">&</span>data); |
| <a href=#414 id=414 data-nosnippet>414</a> <span class="kw">let </span>initial_hash = u16_hash(hash); |
| <a href=#415 id=415 data-nosnippet>415</a> <span class="comment">// Even though 2^INDEX_BITS=2048 items with the same hash seems like a lot, |
| <a href=#416 id=416 data-nosnippet>416</a> // it could happen with macro calls or `use`s in macro-generated files. So we want |
| <a href=#417 id=417 data-nosnippet>417</a> // to handle it gracefully. We just increment the hash. |
| <a href=#418 id=418 data-nosnippet>418</a> </span><span class="kw">let </span><span class="kw-2">mut </span>hash = initial_hash; |
| <a href=#419 id=419 data-nosnippet>419</a> <span class="kw">let </span>index = <span class="kw">loop </span>{ |
| <a href=#420 id=420 data-nosnippet>420</a> <span class="kw">match </span><span class="self">self</span>.<span class="number">0</span>.entry((kind, hash)) { |
| <a href=#421 id=421 data-nosnippet>421</a> std::collections::hash_map::Entry::Occupied(<span class="kw-2">mut </span>entry) => { |
| <a href=#422 id=422 data-nosnippet>422</a> <span class="kw">let </span>i = entry.get_mut(); |
| <a href=#423 id=423 data-nosnippet>423</a> <span class="kw">if </span><span class="kw-2">*</span>i < ((<span class="number">1 </span><< INDEX_BITS) - <span class="number">1</span>) { |
| <a href=#424 id=424 data-nosnippet>424</a> <span class="kw-2">*</span>i += <span class="number">1</span>; |
| <a href=#425 id=425 data-nosnippet>425</a> <span class="kw">break </span><span class="kw-2">*</span>i; |
| <a href=#426 id=426 data-nosnippet>426</a> } |
| <a href=#427 id=427 data-nosnippet>427</a> } |
| <a href=#428 id=428 data-nosnippet>428</a> std::collections::hash_map::Entry::Vacant(entry) => { |
| <a href=#429 id=429 data-nosnippet>429</a> entry.insert(<span class="number">0</span>); |
| <a href=#430 id=430 data-nosnippet>430</a> <span class="kw">break </span><span class="number">0</span>; |
| <a href=#431 id=431 data-nosnippet>431</a> } |
| <a href=#432 id=432 data-nosnippet>432</a> } |
| <a href=#433 id=433 data-nosnippet>433</a> hash = hash.wrapping_add(<span class="number">1</span>); |
| <a href=#434 id=434 data-nosnippet>434</a> <span class="kw">if </span>hash == initial_hash { |
| <a href=#435 id=435 data-nosnippet>435</a> <span class="comment">// That's 2^27=134,217,728 items! |
| <a href=#436 id=436 data-nosnippet>436</a> </span><span class="macro">panic!</span>(<span class="string">"you have way too many items in the same file!"</span>); |
| <a href=#437 id=437 data-nosnippet>437</a> } |
| <a href=#438 id=438 data-nosnippet>438</a> }; |
| <a href=#439 id=439 data-nosnippet>439</a> <span class="kw">let </span>kind = kind <span class="kw">as </span>u32; |
| <a href=#440 id=440 data-nosnippet>440</a> ErasedFileAstId(pack_hash_index_and_kind(hash, index, kind)) |
| <a href=#441 id=441 data-nosnippet>441</a> } |
| <a href=#442 id=442 data-nosnippet>442</a>} |
| <a href=#443 id=443 data-nosnippet>443</a> |
| <a href=#444 id=444 data-nosnippet>444</a><span class="macro">macro_rules!</span> register_enum_ast_id { |
| <a href=#445 id=445 data-nosnippet>445</a> (<span class="kw">impl </span><span class="macro-nonterminal">$AstIdNode</span>:ident <span class="kw">for </span>$(<span class="macro-nonterminal">$ident</span>:ident),+ ) => { |
| <a href=#446 id=446 data-nosnippet>446</a> $( |
| <a href=#447 id=447 data-nosnippet>447</a> <span class="kw">impl </span><span class="macro-nonterminal">$AstIdNode </span><span class="kw">for </span>ast::<span class="macro-nonterminal">$ident </span>{} |
| <a href=#448 id=448 data-nosnippet>448</a> )+ |
| <a href=#449 id=449 data-nosnippet>449</a> }; |
| <a href=#450 id=450 data-nosnippet>450</a>} |
| <a href=#451 id=451 data-nosnippet>451</a><span class="macro">register_enum_ast_id!</span> { |
| <a href=#452 id=452 data-nosnippet>452</a> <span class="kw">impl </span>AstIdNode <span class="kw">for |
| <a href=#453 id=453 data-nosnippet>453</a> </span>Item, AnyHasGenericParams, Adt, Macro, |
| <a href=#454 id=454 data-nosnippet>454</a> AssocItem |
| <a href=#455 id=455 data-nosnippet>455</a>} |
| <a href=#456 id=456 data-nosnippet>456</a> |
| <a href=#457 id=457 data-nosnippet>457</a><span class="macro">macro_rules!</span> register_has_name_ast_id { |
| <a href=#458 id=458 data-nosnippet>458</a> (<span class="kw">impl </span><span class="macro-nonterminal">$AstIdNode</span>:ident <span class="kw">for </span>$(<span class="macro-nonterminal">$ident</span>:ident = <span class="macro-nonterminal">$name_method</span>:ident),+ ) => { |
| <a href=#459 id=459 data-nosnippet>459</a> $( |
| <a href=#460 id=460 data-nosnippet>460</a> <span class="kw">impl </span><span class="macro-nonterminal">$AstIdNode </span><span class="kw">for </span>ast::<span class="macro-nonterminal">$ident </span>{} |
| <a href=#461 id=461 data-nosnippet>461</a> )+ |
| <a href=#462 id=462 data-nosnippet>462</a> |
| <a href=#463 id=463 data-nosnippet>463</a> <span class="kw">fn </span>has_name_ast_id(node: <span class="kw-2">&</span>SyntaxNode, index_map: <span class="kw-2">&mut </span>ErasedAstIdNextIndexMap) -> <span class="prelude-ty">Option</span><ErasedFileAstId> { |
| <a href=#464 id=464 data-nosnippet>464</a> <span class="macro">match_ast!</span> { |
| <a href=#465 id=465 data-nosnippet>465</a> <span class="kw">match </span>node { |
| <a href=#466 id=466 data-nosnippet>466</a> $( |
| <a href=#467 id=467 data-nosnippet>467</a> ast::<span class="macro-nonterminal">$ident</span>(node) => { |
| <a href=#468 id=468 data-nosnippet>468</a> <span class="kw">let </span>name = node.<span class="macro-nonterminal">$name_method</span>(); |
| <a href=#469 id=469 data-nosnippet>469</a> <span class="kw">let </span>name = name.as_ref().map_or(<span class="string">""</span>, |it| it.text_non_mutable()); |
| <a href=#470 id=470 data-nosnippet>470</a> <span class="kw">let </span>result = ErasedHasNameFileAstId { |
| <a href=#471 id=471 data-nosnippet>471</a> name, |
| <a href=#472 id=472 data-nosnippet>472</a> }; |
| <a href=#473 id=473 data-nosnippet>473</a> <span class="prelude-val">Some</span>(index_map.new_id(ErasedFileAstIdKind::<span class="macro-nonterminal">$ident</span>, result)) |
| <a href=#474 id=474 data-nosnippet>474</a> }, |
| <a href=#475 id=475 data-nosnippet>475</a> )* |
| <a href=#476 id=476 data-nosnippet>476</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| <a href=#477 id=477 data-nosnippet>477</a> } |
| <a href=#478 id=478 data-nosnippet>478</a> } |
| <a href=#479 id=479 data-nosnippet>479</a> } |
| <a href=#480 id=480 data-nosnippet>480</a> |
| <a href=#481 id=481 data-nosnippet>481</a> <span class="kw">fn </span>should_alloc_has_name(kind: SyntaxKind) -> bool { |
| <a href=#482 id=482 data-nosnippet>482</a> <span class="bool-val">false </span>$( || ast::<span class="macro-nonterminal">$ident::can_cast</span>(kind) )* |
| <a href=#483 id=483 data-nosnippet>483</a> } |
| <a href=#484 id=484 data-nosnippet>484</a> }; |
| <a href=#485 id=485 data-nosnippet>485</a>} |
| <a href=#486 id=486 data-nosnippet>486</a><span class="macro">register_has_name_ast_id!</span> { |
| <a href=#487 id=487 data-nosnippet>487</a> <span class="kw">impl </span>AstIdNode <span class="kw">for |
| <a href=#488 id=488 data-nosnippet>488</a> </span>Enum = name, |
| <a href=#489 id=489 data-nosnippet>489</a> Struct = name, |
| <a href=#490 id=490 data-nosnippet>490</a> Union = name, |
| <a href=#491 id=491 data-nosnippet>491</a> ExternCrate = name_ref, |
| <a href=#492 id=492 data-nosnippet>492</a> MacroDef = name, |
| <a href=#493 id=493 data-nosnippet>493</a> MacroRules = name, |
| <a href=#494 id=494 data-nosnippet>494</a> Module = name, |
| <a href=#495 id=495 data-nosnippet>495</a> Static = name, |
| <a href=#496 id=496 data-nosnippet>496</a> Trait = name |
| <a href=#497 id=497 data-nosnippet>497</a>} |
| <a href=#498 id=498 data-nosnippet>498</a> |
| <a href=#499 id=499 data-nosnippet>499</a><span class="macro">macro_rules!</span> register_assoc_item_ast_id { |
| <a href=#500 id=500 data-nosnippet>500</a> (<span class="kw">impl </span><span class="macro-nonterminal">$AstIdNode</span>:ident <span class="kw">for </span>$(<span class="macro-nonterminal">$ident</span>:ident = <span class="macro-nonterminal">$name_callback</span>:expr),+ ) => { |
| <a href=#501 id=501 data-nosnippet>501</a> $( |
| <a href=#502 id=502 data-nosnippet>502</a> <span class="kw">impl </span><span class="macro-nonterminal">$AstIdNode </span><span class="kw">for </span>ast::<span class="macro-nonterminal">$ident </span>{} |
| <a href=#503 id=503 data-nosnippet>503</a> )+ |
| <a href=#504 id=504 data-nosnippet>504</a> |
| <a href=#505 id=505 data-nosnippet>505</a> <span class="kw">fn </span>assoc_item_ast_id( |
| <a href=#506 id=506 data-nosnippet>506</a> node: <span class="kw-2">&</span>SyntaxNode, |
| <a href=#507 id=507 data-nosnippet>507</a> index_map: <span class="kw-2">&mut </span>ErasedAstIdNextIndexMap, |
| <a href=#508 id=508 data-nosnippet>508</a> parent: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>ErasedFileAstId>, |
| <a href=#509 id=509 data-nosnippet>509</a> ) -> <span class="prelude-ty">Option</span><ErasedFileAstId> { |
| <a href=#510 id=510 data-nosnippet>510</a> <span class="macro">match_ast!</span> { |
| <a href=#511 id=511 data-nosnippet>511</a> <span class="kw">match </span>node { |
| <a href=#512 id=512 data-nosnippet>512</a> $( |
| <a href=#513 id=513 data-nosnippet>513</a> ast::<span class="macro-nonterminal">$ident</span>(node) => { |
| <a href=#514 id=514 data-nosnippet>514</a> <span class="kw">let </span>name = <span class="macro-nonterminal">$name_callback</span>(node); |
| <a href=#515 id=515 data-nosnippet>515</a> <span class="kw">let </span>name = name.as_ref().map_or(<span class="string">""</span>, |it| it.text_non_mutable()); |
| <a href=#516 id=516 data-nosnippet>516</a> <span class="kw">let </span>properties = ErasedHasNameFileAstId { |
| <a href=#517 id=517 data-nosnippet>517</a> name, |
| <a href=#518 id=518 data-nosnippet>518</a> }; |
| <a href=#519 id=519 data-nosnippet>519</a> <span class="kw">let </span>result = ErasedAssocItemFileAstId { |
| <a href=#520 id=520 data-nosnippet>520</a> parent: parent.copied(), |
| <a href=#521 id=521 data-nosnippet>521</a> properties, |
| <a href=#522 id=522 data-nosnippet>522</a> }; |
| <a href=#523 id=523 data-nosnippet>523</a> <span class="prelude-val">Some</span>(index_map.new_id(ErasedFileAstIdKind::<span class="macro-nonterminal">$ident</span>, result)) |
| <a href=#524 id=524 data-nosnippet>524</a> }, |
| <a href=#525 id=525 data-nosnippet>525</a> )* |
| <a href=#526 id=526 data-nosnippet>526</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| <a href=#527 id=527 data-nosnippet>527</a> } |
| <a href=#528 id=528 data-nosnippet>528</a> } |
| <a href=#529 id=529 data-nosnippet>529</a> } |
| <a href=#530 id=530 data-nosnippet>530</a> |
| <a href=#531 id=531 data-nosnippet>531</a> <span class="kw">fn </span>should_alloc_assoc_item(kind: SyntaxKind) -> bool { |
| <a href=#532 id=532 data-nosnippet>532</a> <span class="bool-val">false </span>$( || ast::<span class="macro-nonterminal">$ident::can_cast</span>(kind) )* |
| <a href=#533 id=533 data-nosnippet>533</a> } |
| <a href=#534 id=534 data-nosnippet>534</a> }; |
| <a href=#535 id=535 data-nosnippet>535</a>} |
| <a href=#536 id=536 data-nosnippet>536</a><span class="macro">register_assoc_item_ast_id!</span> { |
| <a href=#537 id=537 data-nosnippet>537</a> <span class="kw">impl </span>AstIdNode <span class="kw">for |
| <a href=#538 id=538 data-nosnippet>538</a> </span>Variant = |it: ast::Variant| it.name(), |
| <a href=#539 id=539 data-nosnippet>539</a> Const = |it: ast::Const| it.name(), |
| <a href=#540 id=540 data-nosnippet>540</a> Fn = |it: ast::Fn| it.name(), |
| <a href=#541 id=541 data-nosnippet>541</a> MacroCall = |it: ast::MacroCall| it.path().and_then(|path| path.segment()<span class="question-mark">?</span>.name_ref()), |
| <a href=#542 id=542 data-nosnippet>542</a> TypeAlias = |it: ast::TypeAlias| it.name() |
| <a href=#543 id=543 data-nosnippet>543</a>} |
| <a href=#544 id=544 data-nosnippet>544</a> |
| <a href=#545 id=545 data-nosnippet>545</a><span class="doccomment">/// Maps items' `SyntaxNode`s to `ErasedFileAstId`s and back. |
| <a href=#546 id=546 data-nosnippet>546</a></span><span class="attr">#[derive(Default)] |
| <a href=#547 id=547 data-nosnippet>547</a></span><span class="kw">pub struct </span>AstIdMap { |
| <a href=#548 id=548 data-nosnippet>548</a> <span class="doccomment">/// An arena of the ptrs and their associated ID. |
| <a href=#549 id=549 data-nosnippet>549</a> </span>arena: Arena<(SyntaxNodePtr, ErasedFileAstId)>, |
| <a href=#550 id=550 data-nosnippet>550</a> <span class="doccomment">/// Map ptr to id. |
| <a href=#551 id=551 data-nosnippet>551</a> </span>ptr_map: hashbrown::HashTable<ArenaId>, |
| <a href=#552 id=552 data-nosnippet>552</a> <span class="doccomment">/// Map id to ptr. |
| <a href=#553 id=553 data-nosnippet>553</a> </span>id_map: hashbrown::HashTable<ArenaId>, |
| <a href=#554 id=554 data-nosnippet>554</a>} |
| <a href=#555 id=555 data-nosnippet>555</a> |
| <a href=#556 id=556 data-nosnippet>556</a><span class="kw">type </span>ArenaId = Idx<(SyntaxNodePtr, ErasedFileAstId)>; |
| <a href=#557 id=557 data-nosnippet>557</a> |
| <a href=#558 id=558 data-nosnippet>558</a><span class="kw">impl </span>fmt::Debug <span class="kw">for </span>AstIdMap { |
| <a href=#559 id=559 data-nosnippet>559</a> <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <a href=#560 id=560 data-nosnippet>560</a> f.debug_struct(<span class="string">"AstIdMap"</span>).field(<span class="string">"arena"</span>, <span class="kw-2">&</span><span class="self">self</span>.arena).finish() |
| <a href=#561 id=561 data-nosnippet>561</a> } |
| <a href=#562 id=562 data-nosnippet>562</a>} |
| <a href=#563 id=563 data-nosnippet>563</a> |
| <a href=#564 id=564 data-nosnippet>564</a><span class="kw">impl </span>PartialEq <span class="kw">for </span>AstIdMap { |
| <a href=#565 id=565 data-nosnippet>565</a> <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <a href=#566 id=566 data-nosnippet>566</a> <span class="self">self</span>.arena == other.arena |
| <a href=#567 id=567 data-nosnippet>567</a> } |
| <a href=#568 id=568 data-nosnippet>568</a>} |
| <a href=#569 id=569 data-nosnippet>569</a><span class="kw">impl </span>Eq <span class="kw">for </span>AstIdMap {} |
| <a href=#570 id=570 data-nosnippet>570</a> |
| <a href=#571 id=571 data-nosnippet>571</a><span class="attr">#[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| <a href=#572 id=572 data-nosnippet>572</a></span><span class="kw">enum </span>ContainsItems { |
| <a href=#573 id=573 data-nosnippet>573</a> Yes, |
| <a href=#574 id=574 data-nosnippet>574</a> No, |
| <a href=#575 id=575 data-nosnippet>575</a>} |
| <a href=#576 id=576 data-nosnippet>576</a> |
| <a href=#577 id=577 data-nosnippet>577</a><span class="kw">impl </span>AstIdMap { |
| <a href=#578 id=578 data-nosnippet>578</a> <span class="kw">pub fn </span>from_source(node: <span class="kw-2">&</span>SyntaxNode) -> AstIdMap { |
| <a href=#579 id=579 data-nosnippet>579</a> <span class="macro">assert!</span>(node.parent().is_none()); |
| <a href=#580 id=580 data-nosnippet>580</a> <span class="kw">let </span><span class="kw-2">mut </span>res = AstIdMap::default(); |
| <a href=#581 id=581 data-nosnippet>581</a> <span class="kw">let </span><span class="kw-2">mut </span>index_map = ErasedAstIdNextIndexMap::default(); |
| <a href=#582 id=582 data-nosnippet>582</a> |
| <a href=#583 id=583 data-nosnippet>583</a> <span class="comment">// Ensure we allocate the root. |
| <a href=#584 id=584 data-nosnippet>584</a> </span>res.arena.alloc((SyntaxNodePtr::new(node), ROOT_ERASED_FILE_AST_ID)); |
| <a href=#585 id=585 data-nosnippet>585</a> |
| <a href=#586 id=586 data-nosnippet>586</a> <span class="comment">// By walking the tree in breadth-first order we make sure that parents |
| <a href=#587 id=587 data-nosnippet>587</a> // get lower ids then children. That is, adding a new child does not |
| <a href=#588 id=588 data-nosnippet>588</a> // change parent's id. This means that, say, adding a new function to a |
| <a href=#589 id=589 data-nosnippet>589</a> // trait does not change ids of top-level items, which helps caching. |
| <a href=#590 id=590 data-nosnippet>590</a> |
| <a href=#591 id=591 data-nosnippet>591</a> // This contains the stack of the `BlockExpr`s we are under. We do this |
| <a href=#592 id=592 data-nosnippet>592</a> // so we only allocate `BlockExpr`s if they contain items. |
| <a href=#593 id=593 data-nosnippet>593</a> // The general idea is: when we enter a block we push `(block, false)` here. |
| <a href=#594 id=594 data-nosnippet>594</a> // Items inside the block are attributed to the block's container, not the block. |
| <a href=#595 id=595 data-nosnippet>595</a> // For the first item we find inside a block, we make this `(block, true)` |
| <a href=#596 id=596 data-nosnippet>596</a> // and create an ast id for the block. When exiting the block we pop it, |
| <a href=#597 id=597 data-nosnippet>597</a> // whether or not we created an ast id for it. |
| <a href=#598 id=598 data-nosnippet>598</a> // It may seem that with this setup we will generate an ID for blocks that |
| <a href=#599 id=599 data-nosnippet>599</a> // have no items directly but have items inside other items inside them. |
| <a href=#600 id=600 data-nosnippet>600</a> // This is true, but it doesn't matter, because such blocks can't exist. |
| <a href=#601 id=601 data-nosnippet>601</a> // After all, the block will then contain the *outer* item, so we allocate |
| <a href=#602 id=602 data-nosnippet>602</a> // an ID for it anyway. |
| <a href=#603 id=603 data-nosnippet>603</a> </span><span class="kw">let </span><span class="kw-2">mut </span>blocks = Vec::new(); |
| <a href=#604 id=604 data-nosnippet>604</a> <span class="kw">let </span><span class="kw-2">mut </span>curr_layer = Vec::with_capacity(<span class="number">32</span>); |
| <a href=#605 id=605 data-nosnippet>605</a> curr_layer.push((node.clone(), <span class="prelude-val">None</span>)); |
| <a href=#606 id=606 data-nosnippet>606</a> <span class="kw">let </span><span class="kw-2">mut </span>next_layer = Vec::with_capacity(<span class="number">32</span>); |
| <a href=#607 id=607 data-nosnippet>607</a> <span class="kw">while </span>!curr_layer.is_empty() { |
| <a href=#608 id=608 data-nosnippet>608</a> curr_layer.drain(..).for_each(|(node, parent_idx)| { |
| <a href=#609 id=609 data-nosnippet>609</a> <span class="kw">let </span><span class="kw-2">mut </span>preorder = node.preorder(); |
| <a href=#610 id=610 data-nosnippet>610</a> <span class="kw">while let </span><span class="prelude-val">Some</span>(event) = preorder.next() { |
| <a href=#611 id=611 data-nosnippet>611</a> <span class="kw">match </span>event { |
| <a href=#612 id=612 data-nosnippet>612</a> syntax::WalkEvent::Enter(node) => { |
| <a href=#613 id=613 data-nosnippet>613</a> <span class="kw">if </span>ast::BlockExpr::can_cast(node.kind()) { |
| <a href=#614 id=614 data-nosnippet>614</a> blocks.push((node, ContainsItems::No)); |
| <a href=#615 id=615 data-nosnippet>615</a> } <span class="kw">else if </span>ErasedFileAstId::should_alloc(<span class="kw-2">&</span>node) { |
| <a href=#616 id=616 data-nosnippet>616</a> <span class="comment">// Allocate blocks on-demand, only if they have items. |
| <a href=#617 id=617 data-nosnippet>617</a> // We don't associate items with blocks, only with items, since block IDs can be quite unstable. |
| <a href=#618 id=618 data-nosnippet>618</a> // FIXME: Is this the correct thing to do? Macro calls might actually be more incremental if |
| <a href=#619 id=619 data-nosnippet>619</a> // associated with blocks (not sure). Either way it's not a big deal. |
| <a href=#620 id=620 data-nosnippet>620</a> </span><span class="kw">if let </span><span class="prelude-val">Some</span>(( |
| <a href=#621 id=621 data-nosnippet>621</a> last_block_node, |
| <a href=#622 id=622 data-nosnippet>622</a> already_allocated @ ContainsItems::No, |
| <a href=#623 id=623 data-nosnippet>623</a> )) = blocks.last_mut() |
| <a href=#624 id=624 data-nosnippet>624</a> { |
| <a href=#625 id=625 data-nosnippet>625</a> <span class="kw">let </span>block_ast_id = block_expr_ast_id( |
| <a href=#626 id=626 data-nosnippet>626</a> last_block_node, |
| <a href=#627 id=627 data-nosnippet>627</a> <span class="kw-2">&mut </span>index_map, |
| <a href=#628 id=628 data-nosnippet>628</a> parent_of(parent_idx, <span class="kw-2">&</span>res), |
| <a href=#629 id=629 data-nosnippet>629</a> ) |
| <a href=#630 id=630 data-nosnippet>630</a> .expect(<span class="string">"not a BlockExpr"</span>); |
| <a href=#631 id=631 data-nosnippet>631</a> res.arena |
| <a href=#632 id=632 data-nosnippet>632</a> .alloc((SyntaxNodePtr::new(last_block_node), block_ast_id)); |
| <a href=#633 id=633 data-nosnippet>633</a> <span class="kw-2">*</span>already_allocated = ContainsItems::Yes; |
| <a href=#634 id=634 data-nosnippet>634</a> } |
| <a href=#635 id=635 data-nosnippet>635</a> |
| <a href=#636 id=636 data-nosnippet>636</a> <span class="kw">let </span>parent = parent_of(parent_idx, <span class="kw-2">&</span>res); |
| <a href=#637 id=637 data-nosnippet>637</a> <span class="kw">let </span>ast_id = |
| <a href=#638 id=638 data-nosnippet>638</a> ErasedFileAstId::ast_id_for(<span class="kw-2">&</span>node, <span class="kw-2">&mut </span>index_map, parent) |
| <a href=#639 id=639 data-nosnippet>639</a> .expect(<span class="string">"this node should have an ast id"</span>); |
| <a href=#640 id=640 data-nosnippet>640</a> <span class="kw">let </span>idx = res.arena.alloc((SyntaxNodePtr::new(<span class="kw-2">&</span>node), ast_id)); |
| <a href=#641 id=641 data-nosnippet>641</a> |
| <a href=#642 id=642 data-nosnippet>642</a> next_layer.extend(node.children().map(|child| (child, <span class="prelude-val">Some</span>(idx)))); |
| <a href=#643 id=643 data-nosnippet>643</a> preorder.skip_subtree(); |
| <a href=#644 id=644 data-nosnippet>644</a> } |
| <a href=#645 id=645 data-nosnippet>645</a> } |
| <a href=#646 id=646 data-nosnippet>646</a> syntax::WalkEvent::Leave(node) => { |
| <a href=#647 id=647 data-nosnippet>647</a> <span class="kw">if </span>ast::BlockExpr::can_cast(node.kind()) { |
| <a href=#648 id=648 data-nosnippet>648</a> <span class="macro">assert_eq!</span>( |
| <a href=#649 id=649 data-nosnippet>649</a> blocks.pop().map(|it| it.<span class="number">0</span>), |
| <a href=#650 id=650 data-nosnippet>650</a> <span class="prelude-val">Some</span>(node), |
| <a href=#651 id=651 data-nosnippet>651</a> <span class="string">"left a BlockExpr we never entered" |
| <a href=#652 id=652 data-nosnippet>652</a> </span>); |
| <a href=#653 id=653 data-nosnippet>653</a> } |
| <a href=#654 id=654 data-nosnippet>654</a> } |
| <a href=#655 id=655 data-nosnippet>655</a> } |
| <a href=#656 id=656 data-nosnippet>656</a> } |
| <a href=#657 id=657 data-nosnippet>657</a> }); |
| <a href=#658 id=658 data-nosnippet>658</a> std::mem::swap(<span class="kw-2">&mut </span>curr_layer, <span class="kw-2">&mut </span>next_layer); |
| <a href=#659 id=659 data-nosnippet>659</a> <span class="macro">assert!</span>(blocks.is_empty(), <span class="string">"didn't leave all BlockExprs"</span>); |
| <a href=#660 id=660 data-nosnippet>660</a> } |
| <a href=#661 id=661 data-nosnippet>661</a> |
| <a href=#662 id=662 data-nosnippet>662</a> res.ptr_map = hashbrown::HashTable::with_capacity(res.arena.len()); |
| <a href=#663 id=663 data-nosnippet>663</a> res.id_map = hashbrown::HashTable::with_capacity(res.arena.len()); |
| <a href=#664 id=664 data-nosnippet>664</a> <span class="kw">for </span>(idx, (ptr, ast_id)) <span class="kw">in </span>res.arena.iter() { |
| <a href=#665 id=665 data-nosnippet>665</a> <span class="kw">let </span>ptr_hash = hash_ptr(ptr); |
| <a href=#666 id=666 data-nosnippet>666</a> <span class="kw">let </span>ast_id_hash = hash_ast_id(ast_id); |
| <a href=#667 id=667 data-nosnippet>667</a> <span class="kw">match </span>res.ptr_map.entry( |
| <a href=#668 id=668 data-nosnippet>668</a> ptr_hash, |
| <a href=#669 id=669 data-nosnippet>669</a> |idx2| <span class="kw-2">*</span>idx2 == idx, |
| <a href=#670 id=670 data-nosnippet>670</a> |<span class="kw-2">&</span>idx| hash_ptr(<span class="kw-2">&</span>res.arena[idx].<span class="number">0</span>), |
| <a href=#671 id=671 data-nosnippet>671</a> ) { |
| <a href=#672 id=672 data-nosnippet>672</a> hashbrown::hash_table::Entry::Occupied(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(), |
| <a href=#673 id=673 data-nosnippet>673</a> hashbrown::hash_table::Entry::Vacant(entry) => { |
| <a href=#674 id=674 data-nosnippet>674</a> entry.insert(idx); |
| <a href=#675 id=675 data-nosnippet>675</a> } |
| <a href=#676 id=676 data-nosnippet>676</a> } |
| <a href=#677 id=677 data-nosnippet>677</a> <span class="kw">match </span>res.id_map.entry( |
| <a href=#678 id=678 data-nosnippet>678</a> ast_id_hash, |
| <a href=#679 id=679 data-nosnippet>679</a> |idx2| <span class="kw-2">*</span>idx2 == idx, |
| <a href=#680 id=680 data-nosnippet>680</a> |<span class="kw-2">&</span>idx| hash_ast_id(<span class="kw-2">&</span>res.arena[idx].<span class="number">1</span>), |
| <a href=#681 id=681 data-nosnippet>681</a> ) { |
| <a href=#682 id=682 data-nosnippet>682</a> hashbrown::hash_table::Entry::Occupied(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(), |
| <a href=#683 id=683 data-nosnippet>683</a> hashbrown::hash_table::Entry::Vacant(entry) => { |
| <a href=#684 id=684 data-nosnippet>684</a> entry.insert(idx); |
| <a href=#685 id=685 data-nosnippet>685</a> } |
| <a href=#686 id=686 data-nosnippet>686</a> } |
| <a href=#687 id=687 data-nosnippet>687</a> } |
| <a href=#688 id=688 data-nosnippet>688</a> res.arena.shrink_to_fit(); |
| <a href=#689 id=689 data-nosnippet>689</a> <span class="kw">return </span>res; |
| <a href=#690 id=690 data-nosnippet>690</a> |
| <a href=#691 id=691 data-nosnippet>691</a> <span class="kw">fn </span>parent_of(parent_idx: <span class="prelude-ty">Option</span><ArenaId>, res: <span class="kw-2">&</span>AstIdMap) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>ErasedFileAstId> { |
| <a href=#692 id=692 data-nosnippet>692</a> <span class="kw">let </span><span class="kw-2">mut </span>parent = parent_idx.map(|parent_idx| <span class="kw-2">&</span>res.arena[parent_idx].<span class="number">1</span>); |
| <a href=#693 id=693 data-nosnippet>693</a> <span class="kw">if </span>parent.is_some_and(|parent| parent.kind() == ErasedFileAstIdKind::ExternBlock <span class="kw">as </span>u32) |
| <a href=#694 id=694 data-nosnippet>694</a> { |
| <a href=#695 id=695 data-nosnippet>695</a> <span class="comment">// See the comment on `ErasedAssocItemFileAstId` for why is this. |
| <a href=#696 id=696 data-nosnippet>696</a> // FIXME: Technically there could be an extern block inside another item, e.g.: |
| <a href=#697 id=697 data-nosnippet>697</a> // ``` |
| <a href=#698 id=698 data-nosnippet>698</a> // fn foo() { |
| <a href=#699 id=699 data-nosnippet>699</a> // extern "C" { |
| <a href=#700 id=700 data-nosnippet>700</a> // fn bar(); |
| <a href=#701 id=701 data-nosnippet>701</a> // } |
| <a href=#702 id=702 data-nosnippet>702</a> // } |
| <a href=#703 id=703 data-nosnippet>703</a> // ``` |
| <a href=#704 id=704 data-nosnippet>704</a> // Here we want to make `foo()` the parent of `bar()`, but we make it `None`. |
| <a href=#705 id=705 data-nosnippet>705</a> // Shouldn't be a big deal though. |
| <a href=#706 id=706 data-nosnippet>706</a> </span>parent = <span class="prelude-val">None</span>; |
| <a href=#707 id=707 data-nosnippet>707</a> } |
| <a href=#708 id=708 data-nosnippet>708</a> parent |
| <a href=#709 id=709 data-nosnippet>709</a> } |
| <a href=#710 id=710 data-nosnippet>710</a> } |
| <a href=#711 id=711 data-nosnippet>711</a> |
| <a href=#712 id=712 data-nosnippet>712</a> <span class="doccomment">/// The root node. |
| <a href=#713 id=713 data-nosnippet>713</a> </span><span class="kw">pub fn </span>root(<span class="kw-2">&</span><span class="self">self</span>) -> SyntaxNodePtr { |
| <a href=#714 id=714 data-nosnippet>714</a> <span class="self">self</span>.arena[Idx::from_raw(RawIdx::from_u32(<span class="number">0</span>))].<span class="number">0 |
| <a href=#715 id=715 data-nosnippet>715</a> </span>} |
| <a href=#716 id=716 data-nosnippet>716</a> |
| <a href=#717 id=717 data-nosnippet>717</a> <span class="kw">pub fn </span>ast_id<N: AstIdNode>(<span class="kw-2">&</span><span class="self">self</span>, item: <span class="kw-2">&</span>N) -> FileAstId<N> { |
| <a href=#718 id=718 data-nosnippet>718</a> <span class="self">self</span>.ast_id_for_ptr(AstPtr::new(item)) |
| <a href=#719 id=719 data-nosnippet>719</a> } |
| <a href=#720 id=720 data-nosnippet>720</a> |
| <a href=#721 id=721 data-nosnippet>721</a> <span class="doccomment">/// Blocks may not be allocated (if they have no items), so they have a different API. |
| <a href=#722 id=722 data-nosnippet>722</a> </span><span class="kw">pub fn </span>ast_id_for_block(<span class="kw-2">&</span><span class="self">self</span>, block: <span class="kw-2">&</span>ast::BlockExpr) -> <span class="prelude-ty">Option</span><FileAstId<ast::BlockExpr>> { |
| <a href=#723 id=723 data-nosnippet>723</a> <span class="self">self</span>.ast_id_for_ptr_for_block(AstPtr::new(block)) |
| <a href=#724 id=724 data-nosnippet>724</a> } |
| <a href=#725 id=725 data-nosnippet>725</a> |
| <a href=#726 id=726 data-nosnippet>726</a> <span class="kw">pub fn </span>ast_id_for_ptr<N: AstIdNode>(<span class="kw-2">&</span><span class="self">self</span>, ptr: AstPtr<N>) -> FileAstId<N> { |
| <a href=#727 id=727 data-nosnippet>727</a> <span class="kw">let </span>ptr = ptr.syntax_node_ptr(); |
| <a href=#728 id=728 data-nosnippet>728</a> FileAstId { raw: <span class="self">self</span>.erased_ast_id(ptr), _marker: PhantomData } |
| <a href=#729 id=729 data-nosnippet>729</a> } |
| <a href=#730 id=730 data-nosnippet>730</a> |
| <a href=#731 id=731 data-nosnippet>731</a> <span class="doccomment">/// Blocks may not be allocated (if they have no items), so they have a different API. |
| <a href=#732 id=732 data-nosnippet>732</a> </span><span class="kw">pub fn </span>ast_id_for_ptr_for_block( |
| <a href=#733 id=733 data-nosnippet>733</a> <span class="kw-2">&</span><span class="self">self</span>, |
| <a href=#734 id=734 data-nosnippet>734</a> ptr: AstPtr<ast::BlockExpr>, |
| <a href=#735 id=735 data-nosnippet>735</a> ) -> <span class="prelude-ty">Option</span><FileAstId<ast::BlockExpr>> { |
| <a href=#736 id=736 data-nosnippet>736</a> <span class="kw">let </span>ptr = ptr.syntax_node_ptr(); |
| <a href=#737 id=737 data-nosnippet>737</a> <span class="self">self</span>.try_erased_ast_id(ptr).map(|raw| FileAstId { raw, _marker: PhantomData }) |
| <a href=#738 id=738 data-nosnippet>738</a> } |
| <a href=#739 id=739 data-nosnippet>739</a> |
| <a href=#740 id=740 data-nosnippet>740</a> <span class="kw">fn </span>erased_ast_id(<span class="kw-2">&</span><span class="self">self</span>, ptr: SyntaxNodePtr) -> ErasedFileAstId { |
| <a href=#741 id=741 data-nosnippet>741</a> <span class="self">self</span>.try_erased_ast_id(ptr).unwrap_or_else(|| { |
| <a href=#742 id=742 data-nosnippet>742</a> <span class="macro">panic!</span>( |
| <a href=#743 id=743 data-nosnippet>743</a> <span class="string">"Can't find SyntaxNodePtr {:?} in AstIdMap:\n{:?}"</span>, |
| <a href=#744 id=744 data-nosnippet>744</a> ptr, |
| <a href=#745 id=745 data-nosnippet>745</a> <span class="self">self</span>.arena.iter().map(|(_id, i)| i).collect::<Vec<<span class="kw">_</span>>>(), |
| <a href=#746 id=746 data-nosnippet>746</a> ) |
| <a href=#747 id=747 data-nosnippet>747</a> }) |
| <a href=#748 id=748 data-nosnippet>748</a> } |
| <a href=#749 id=749 data-nosnippet>749</a> |
| <a href=#750 id=750 data-nosnippet>750</a> <span class="kw">fn </span>try_erased_ast_id(<span class="kw-2">&</span><span class="self">self</span>, ptr: SyntaxNodePtr) -> <span class="prelude-ty">Option</span><ErasedFileAstId> { |
| <a href=#751 id=751 data-nosnippet>751</a> <span class="kw">let </span>hash = hash_ptr(<span class="kw-2">&</span>ptr); |
| <a href=#752 id=752 data-nosnippet>752</a> <span class="kw">let </span>idx = <span class="kw-2">*</span><span class="self">self</span>.ptr_map.find(hash, |<span class="kw-2">&</span>idx| <span class="self">self</span>.arena[idx].<span class="number">0 </span>== ptr)<span class="question-mark">?</span>; |
| <a href=#753 id=753 data-nosnippet>753</a> <span class="prelude-val">Some</span>(<span class="self">self</span>.arena[idx].<span class="number">1</span>) |
| <a href=#754 id=754 data-nosnippet>754</a> } |
| <a href=#755 id=755 data-nosnippet>755</a> |
| <a href=#756 id=756 data-nosnippet>756</a> <span class="comment">// Don't bound on `AstIdNode` here, because `BlockExpr`s are also valid here (`ast::BlockExpr` |
| <a href=#757 id=757 data-nosnippet>757</a> // doesn't always have a matching `FileAstId`, but a `FileAstId<ast::BlockExpr>` always has |
| <a href=#758 id=758 data-nosnippet>758</a> // a matching node). |
| <a href=#759 id=759 data-nosnippet>759</a> </span><span class="kw">pub fn </span>get<N: AstNode>(<span class="kw-2">&</span><span class="self">self</span>, id: FileAstId<N>) -> AstPtr<N> { |
| <a href=#760 id=760 data-nosnippet>760</a> <span class="kw">let </span>ptr = <span class="self">self</span>.get_erased(id.raw); |
| <a href=#761 id=761 data-nosnippet>761</a> AstPtr::try_from_raw(ptr) |
| <a href=#762 id=762 data-nosnippet>762</a> .unwrap_or_else(|| <span class="macro">panic!</span>(<span class="string">"AstIdMap node mismatch with node `{ptr:?}`"</span>)) |
| <a href=#763 id=763 data-nosnippet>763</a> } |
| <a href=#764 id=764 data-nosnippet>764</a> |
| <a href=#765 id=765 data-nosnippet>765</a> <span class="kw">pub fn </span>get_erased(<span class="kw-2">&</span><span class="self">self</span>, id: ErasedFileAstId) -> SyntaxNodePtr { |
| <a href=#766 id=766 data-nosnippet>766</a> <span class="kw">let </span>hash = hash_ast_id(<span class="kw-2">&</span>id); |
| <a href=#767 id=767 data-nosnippet>767</a> <span class="kw">match </span><span class="self">self</span>.id_map.find(hash, |<span class="kw-2">&</span>idx| <span class="self">self</span>.arena[idx].<span class="number">1 </span>== id) { |
| <a href=#768 id=768 data-nosnippet>768</a> <span class="prelude-val">Some</span>(<span class="kw-2">&</span>idx) => <span class="self">self</span>.arena[idx].<span class="number">0</span>, |
| <a href=#769 id=769 data-nosnippet>769</a> <span class="prelude-val">None </span>=> <span class="macro">panic!</span>( |
| <a href=#770 id=770 data-nosnippet>770</a> <span class="string">"Can't find ast id {:?} in AstIdMap:\n{:?}"</span>, |
| <a href=#771 id=771 data-nosnippet>771</a> id, |
| <a href=#772 id=772 data-nosnippet>772</a> <span class="self">self</span>.arena.iter().map(|(_id, i)| i).collect::<Vec<<span class="kw">_</span>>>(), |
| <a href=#773 id=773 data-nosnippet>773</a> ), |
| <a href=#774 id=774 data-nosnippet>774</a> } |
| <a href=#775 id=775 data-nosnippet>775</a> } |
| <a href=#776 id=776 data-nosnippet>776</a>} |
| <a href=#777 id=777 data-nosnippet>777</a> |
| <a href=#778 id=778 data-nosnippet>778</a><span class="attr">#[cfg(not(no_salsa_async_drops))] |
| <a href=#779 id=779 data-nosnippet>779</a></span><span class="kw">impl </span>Drop <span class="kw">for </span>AstIdMap { |
| <a href=#780 id=780 data-nosnippet>780</a> <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <a href=#781 id=781 data-nosnippet>781</a> <span class="kw">let </span>arena = std::mem::take(<span class="kw-2">&mut </span><span class="self">self</span>.arena); |
| <a href=#782 id=782 data-nosnippet>782</a> <span class="kw">let </span>ptr_map = std::mem::take(<span class="kw-2">&mut </span><span class="self">self</span>.ptr_map); |
| <a href=#783 id=783 data-nosnippet>783</a> <span class="kw">let </span>id_map = std::mem::take(<span class="kw-2">&mut </span><span class="self">self</span>.id_map); |
| <a href=#784 id=784 data-nosnippet>784</a> <span class="kw">static </span>AST_ID_MAP_DROP_THREAD: std::sync::OnceLock< |
| <a href=#785 id=785 data-nosnippet>785</a> std::sync::mpsc::Sender<( |
| <a href=#786 id=786 data-nosnippet>786</a> Arena<(SyntaxNodePtr, ErasedFileAstId)>, |
| <a href=#787 id=787 data-nosnippet>787</a> hashbrown::HashTable<ArenaId>, |
| <a href=#788 id=788 data-nosnippet>788</a> hashbrown::HashTable<ArenaId>, |
| <a href=#789 id=789 data-nosnippet>789</a> )>, |
| <a href=#790 id=790 data-nosnippet>790</a> > = std::sync::OnceLock::new(); |
| <a href=#791 id=791 data-nosnippet>791</a> AST_ID_MAP_DROP_THREAD |
| <a href=#792 id=792 data-nosnippet>792</a> .get_or_init(|| { |
| <a href=#793 id=793 data-nosnippet>793</a> <span class="kw">let </span>(sender, receiver) = std::sync::mpsc::channel::<( |
| <a href=#794 id=794 data-nosnippet>794</a> Arena<(SyntaxNodePtr, ErasedFileAstId)>, |
| <a href=#795 id=795 data-nosnippet>795</a> hashbrown::HashTable<ArenaId>, |
| <a href=#796 id=796 data-nosnippet>796</a> hashbrown::HashTable<ArenaId>, |
| <a href=#797 id=797 data-nosnippet>797</a> )>(); |
| <a href=#798 id=798 data-nosnippet>798</a> std::thread::Builder::new() |
| <a href=#799 id=799 data-nosnippet>799</a> .name(<span class="string">"AstIdMapDropper"</span>.to_owned()) |
| <a href=#800 id=800 data-nosnippet>800</a> .spawn(<span class="kw">move </span>|| { |
| <a href=#801 id=801 data-nosnippet>801</a> <span class="kw">loop </span>{ |
| <a href=#802 id=802 data-nosnippet>802</a> <span class="comment">// block on a receive |
| <a href=#803 id=803 data-nosnippet>803</a> </span><span class="kw">_ </span>= receiver.recv(); |
| <a href=#804 id=804 data-nosnippet>804</a> <span class="comment">// then drain the entire channel |
| <a href=#805 id=805 data-nosnippet>805</a> </span><span class="kw">while </span>receiver.try_recv().is_ok() {} |
| <a href=#806 id=806 data-nosnippet>806</a> <span class="comment">// and sleep for a bit |
| <a href=#807 id=807 data-nosnippet>807</a> </span>std::thread::sleep(std::time::Duration::from_millis(<span class="number">100</span>)); |
| <a href=#808 id=808 data-nosnippet>808</a> } |
| <a href=#809 id=809 data-nosnippet>809</a> <span class="comment">// why do this over just a `receiver.iter().for_each(drop)`? To reduce contention on the channel lock. |
| <a href=#810 id=810 data-nosnippet>810</a> // otherwise this thread will constantly wake up and sleep again. |
| <a href=#811 id=811 data-nosnippet>811</a> </span>}) |
| <a href=#812 id=812 data-nosnippet>812</a> .unwrap(); |
| <a href=#813 id=813 data-nosnippet>813</a> sender |
| <a href=#814 id=814 data-nosnippet>814</a> }) |
| <a href=#815 id=815 data-nosnippet>815</a> .send((arena, ptr_map, id_map)) |
| <a href=#816 id=816 data-nosnippet>816</a> .unwrap(); |
| <a href=#817 id=817 data-nosnippet>817</a> } |
| <a href=#818 id=818 data-nosnippet>818</a>} |
| <a href=#819 id=819 data-nosnippet>819</a> |
| <a href=#820 id=820 data-nosnippet>820</a><span class="attr">#[inline] |
| <a href=#821 id=821 data-nosnippet>821</a></span><span class="kw">fn </span>hash_ptr(ptr: <span class="kw-2">&</span>SyntaxNodePtr) -> u64 { |
| <a href=#822 id=822 data-nosnippet>822</a> FxBuildHasher.hash_one(ptr) |
| <a href=#823 id=823 data-nosnippet>823</a>} |
| <a href=#824 id=824 data-nosnippet>824</a> |
| <a href=#825 id=825 data-nosnippet>825</a><span class="attr">#[inline] |
| <a href=#826 id=826 data-nosnippet>826</a></span><span class="kw">fn </span>hash_ast_id(ptr: <span class="kw-2">&</span>ErasedFileAstId) -> u64 { |
| <a href=#827 id=827 data-nosnippet>827</a> FxBuildHasher.hash_one(ptr) |
| <a href=#828 id=828 data-nosnippet>828</a>} |
| <a href=#829 id=829 data-nosnippet>829</a> |
| <a href=#830 id=830 data-nosnippet>830</a><span class="attr">#[cfg(test)] |
| <a href=#831 id=831 data-nosnippet>831</a></span><span class="kw">mod </span>tests { |
| <a href=#832 id=832 data-nosnippet>832</a> <span class="kw">use </span>syntax::{AstNode, Edition, SourceFile, SyntaxKind, SyntaxNodePtr, WalkEvent, ast}; |
| <a href=#833 id=833 data-nosnippet>833</a> |
| <a href=#834 id=834 data-nosnippet>834</a> <span class="kw">use </span><span class="kw">crate</span>::AstIdMap; |
| <a href=#835 id=835 data-nosnippet>835</a> |
| <a href=#836 id=836 data-nosnippet>836</a> <span class="attr">#[test] |
| <a href=#837 id=837 data-nosnippet>837</a> </span><span class="kw">fn </span>check_all_nodes() { |
| <a href=#838 id=838 data-nosnippet>838</a> <span class="kw">let </span>syntax = SourceFile::parse( |
| <a href=#839 id=839 data-nosnippet>839</a> <span class="string">r#" |
| <a href=#840 id=840 data-nosnippet>840</a>extern crate foo; |
| <a href=#841 id=841 data-nosnippet>841</a>fn foo() { |
| <a href=#842 id=842 data-nosnippet>842</a> union U {} |
| <a href=#843 id=843 data-nosnippet>843</a>} |
| <a href=#844 id=844 data-nosnippet>844</a>struct S; |
| <a href=#845 id=845 data-nosnippet>845</a>macro_rules! m {} |
| <a href=#846 id=846 data-nosnippet>846</a>macro m2() {} |
| <a href=#847 id=847 data-nosnippet>847</a>trait Trait {} |
| <a href=#848 id=848 data-nosnippet>848</a>impl Trait for S {} |
| <a href=#849 id=849 data-nosnippet>849</a>impl S {} |
| <a href=#850 id=850 data-nosnippet>850</a>impl m!() {} |
| <a href=#851 id=851 data-nosnippet>851</a>impl m2!() for m!() {} |
| <a href=#852 id=852 data-nosnippet>852</a>type T = i32; |
| <a href=#853 id=853 data-nosnippet>853</a>enum E { |
| <a href=#854 id=854 data-nosnippet>854</a> V1(), |
| <a href=#855 id=855 data-nosnippet>855</a> V2 {}, |
| <a href=#856 id=856 data-nosnippet>856</a> V3, |
| <a href=#857 id=857 data-nosnippet>857</a>} |
| <a href=#858 id=858 data-nosnippet>858</a>struct S; // duplicate |
| <a href=#859 id=859 data-nosnippet>859</a>extern "C" { |
| <a href=#860 id=860 data-nosnippet>860</a> static S: i32; |
| <a href=#861 id=861 data-nosnippet>861</a>} |
| <a href=#862 id=862 data-nosnippet>862</a>static mut S: i32 = 0; |
| <a href=#863 id=863 data-nosnippet>863</a>const FOO: i32 = 0; |
| <a href=#864 id=864 data-nosnippet>864</a> "#</span>, |
| <a href=#865 id=865 data-nosnippet>865</a> Edition::CURRENT, |
| <a href=#866 id=866 data-nosnippet>866</a> ) |
| <a href=#867 id=867 data-nosnippet>867</a> .syntax_node(); |
| <a href=#868 id=868 data-nosnippet>868</a> <span class="kw">let </span>ast_id_map = AstIdMap::from_source(<span class="kw-2">&</span>syntax); |
| <a href=#869 id=869 data-nosnippet>869</a> <span class="kw">for </span>node <span class="kw">in </span>syntax.preorder() { |
| <a href=#870 id=870 data-nosnippet>870</a> <span class="kw">let </span>WalkEvent::Enter(node) = node <span class="kw">else </span>{ <span class="kw">continue </span>}; |
| <a href=#871 id=871 data-nosnippet>871</a> <span class="kw">if </span>!<span class="macro">matches!</span>( |
| <a href=#872 id=872 data-nosnippet>872</a> node.kind(), |
| <a href=#873 id=873 data-nosnippet>873</a> SyntaxKind::EXTERN_CRATE |
| <a href=#874 id=874 data-nosnippet>874</a> | SyntaxKind::FN |
| <a href=#875 id=875 data-nosnippet>875</a> | SyntaxKind::UNION |
| <a href=#876 id=876 data-nosnippet>876</a> | SyntaxKind::STRUCT |
| <a href=#877 id=877 data-nosnippet>877</a> | SyntaxKind::MACRO_RULES |
| <a href=#878 id=878 data-nosnippet>878</a> | SyntaxKind::MACRO_DEF |
| <a href=#879 id=879 data-nosnippet>879</a> | SyntaxKind::MACRO_CALL |
| <a href=#880 id=880 data-nosnippet>880</a> | SyntaxKind::TRAIT |
| <a href=#881 id=881 data-nosnippet>881</a> | SyntaxKind::IMPL |
| <a href=#882 id=882 data-nosnippet>882</a> | SyntaxKind::TYPE_ALIAS |
| <a href=#883 id=883 data-nosnippet>883</a> | SyntaxKind::ENUM |
| <a href=#884 id=884 data-nosnippet>884</a> | SyntaxKind::VARIANT |
| <a href=#885 id=885 data-nosnippet>885</a> | SyntaxKind::EXTERN_BLOCK |
| <a href=#886 id=886 data-nosnippet>886</a> | SyntaxKind::STATIC |
| <a href=#887 id=887 data-nosnippet>887</a> | SyntaxKind::CONST |
| <a href=#888 id=888 data-nosnippet>888</a> ) { |
| <a href=#889 id=889 data-nosnippet>889</a> <span class="kw">continue</span>; |
| <a href=#890 id=890 data-nosnippet>890</a> } |
| <a href=#891 id=891 data-nosnippet>891</a> <span class="kw">let </span>ptr = SyntaxNodePtr::new(<span class="kw-2">&</span>node); |
| <a href=#892 id=892 data-nosnippet>892</a> <span class="kw">let </span>ast_id = ast_id_map.erased_ast_id(ptr); |
| <a href=#893 id=893 data-nosnippet>893</a> <span class="kw">let </span>turn_back = ast_id_map.get_erased(ast_id); |
| <a href=#894 id=894 data-nosnippet>894</a> <span class="macro">assert_eq!</span>(ptr, turn_back); |
| <a href=#895 id=895 data-nosnippet>895</a> } |
| <a href=#896 id=896 data-nosnippet>896</a> } |
| <a href=#897 id=897 data-nosnippet>897</a> |
| <a href=#898 id=898 data-nosnippet>898</a> <span class="attr">#[test] |
| <a href=#899 id=899 data-nosnippet>899</a> </span><span class="kw">fn </span>different_names_get_different_hashes() { |
| <a href=#900 id=900 data-nosnippet>900</a> <span class="kw">let </span>syntax = SourceFile::parse( |
| <a href=#901 id=901 data-nosnippet>901</a> <span class="string">r#" |
| <a href=#902 id=902 data-nosnippet>902</a>fn foo() {} |
| <a href=#903 id=903 data-nosnippet>903</a>fn bar() {} |
| <a href=#904 id=904 data-nosnippet>904</a> "#</span>, |
| <a href=#905 id=905 data-nosnippet>905</a> Edition::CURRENT, |
| <a href=#906 id=906 data-nosnippet>906</a> ) |
| <a href=#907 id=907 data-nosnippet>907</a> .syntax_node(); |
| <a href=#908 id=908 data-nosnippet>908</a> <span class="kw">let </span>ast_id_map = AstIdMap::from_source(<span class="kw-2">&</span>syntax); |
| <a href=#909 id=909 data-nosnippet>909</a> <span class="kw">let </span>fns = syntax.descendants().filter_map(ast::Fn::cast).collect::<Vec<<span class="kw">_</span>>>(); |
| <a href=#910 id=910 data-nosnippet>910</a> <span class="kw">let </span>[foo_fn, bar_fn] = fns.as_slice() <span class="kw">else </span>{ |
| <a href=#911 id=911 data-nosnippet>911</a> <span class="macro">panic!</span>(<span class="string">"not exactly 2 functions"</span>); |
| <a href=#912 id=912 data-nosnippet>912</a> }; |
| <a href=#913 id=913 data-nosnippet>913</a> <span class="kw">let </span>foo_fn_id = ast_id_map.ast_id(foo_fn); |
| <a href=#914 id=914 data-nosnippet>914</a> <span class="kw">let </span>bar_fn_id = ast_id_map.ast_id(bar_fn); |
| <a href=#915 id=915 data-nosnippet>915</a> <span class="macro">assert_ne!</span>(foo_fn_id.raw.hash_value(), bar_fn_id.raw.hash_value(), <span class="string">"hashes are equal"</span>); |
| <a href=#916 id=916 data-nosnippet>916</a> } |
| <a href=#917 id=917 data-nosnippet>917</a> |
| <a href=#918 id=918 data-nosnippet>918</a> <span class="attr">#[test] |
| <a href=#919 id=919 data-nosnippet>919</a> </span><span class="kw">fn </span>different_parents_get_different_hashes() { |
| <a href=#920 id=920 data-nosnippet>920</a> <span class="kw">let </span>syntax = SourceFile::parse( |
| <a href=#921 id=921 data-nosnippet>921</a> <span class="string">r#" |
| <a href=#922 id=922 data-nosnippet>922</a>fn foo() { |
| <a href=#923 id=923 data-nosnippet>923</a> m!(); |
| <a href=#924 id=924 data-nosnippet>924</a>} |
| <a href=#925 id=925 data-nosnippet>925</a>fn bar() { |
| <a href=#926 id=926 data-nosnippet>926</a> m!(); |
| <a href=#927 id=927 data-nosnippet>927</a>} |
| <a href=#928 id=928 data-nosnippet>928</a> "#</span>, |
| <a href=#929 id=929 data-nosnippet>929</a> Edition::CURRENT, |
| <a href=#930 id=930 data-nosnippet>930</a> ) |
| <a href=#931 id=931 data-nosnippet>931</a> .syntax_node(); |
| <a href=#932 id=932 data-nosnippet>932</a> <span class="kw">let </span>ast_id_map = AstIdMap::from_source(<span class="kw-2">&</span>syntax); |
| <a href=#933 id=933 data-nosnippet>933</a> <span class="kw">let </span>macro_calls = syntax.descendants().filter_map(ast::MacroCall::cast).collect::<Vec<<span class="kw">_</span>>>(); |
| <a href=#934 id=934 data-nosnippet>934</a> <span class="kw">let </span>[macro_call_foo, macro_call_bar] = macro_calls.as_slice() <span class="kw">else </span>{ |
| <a href=#935 id=935 data-nosnippet>935</a> <span class="macro">panic!</span>(<span class="string">"not exactly 2 macro calls"</span>); |
| <a href=#936 id=936 data-nosnippet>936</a> }; |
| <a href=#937 id=937 data-nosnippet>937</a> <span class="kw">let </span>macro_call_foo_id = ast_id_map.ast_id(macro_call_foo); |
| <a href=#938 id=938 data-nosnippet>938</a> <span class="kw">let </span>macro_call_bar_id = ast_id_map.ast_id(macro_call_bar); |
| <a href=#939 id=939 data-nosnippet>939</a> <span class="macro">assert_ne!</span>( |
| <a href=#940 id=940 data-nosnippet>940</a> macro_call_foo_id.raw.hash_value(), |
| <a href=#941 id=941 data-nosnippet>941</a> macro_call_bar_id.raw.hash_value(), |
| <a href=#942 id=942 data-nosnippet>942</a> <span class="string">"hashes are equal" |
| <a href=#943 id=943 data-nosnippet>943</a> </span>); |
| <a href=#944 id=944 data-nosnippet>944</a> } |
| <a href=#945 id=945 data-nosnippet>945</a> |
| <a href=#946 id=946 data-nosnippet>946</a> <span class="attr">#[test] |
| <a href=#947 id=947 data-nosnippet>947</a> </span><span class="kw">fn </span>blocks_with_no_items_have_no_id() { |
| <a href=#948 id=948 data-nosnippet>948</a> <span class="kw">let </span>syntax = SourceFile::parse( |
| <a href=#949 id=949 data-nosnippet>949</a> <span class="string">r#" |
| <a href=#950 id=950 data-nosnippet>950</a>fn foo() { |
| <a href=#951 id=951 data-nosnippet>951</a> let foo = 1; |
| <a href=#952 id=952 data-nosnippet>952</a> bar(foo); |
| <a href=#953 id=953 data-nosnippet>953</a>} |
| <a href=#954 id=954 data-nosnippet>954</a> "#</span>, |
| <a href=#955 id=955 data-nosnippet>955</a> Edition::CURRENT, |
| <a href=#956 id=956 data-nosnippet>956</a> ) |
| <a href=#957 id=957 data-nosnippet>957</a> .syntax_node(); |
| <a href=#958 id=958 data-nosnippet>958</a> <span class="kw">let </span>ast_id_map = AstIdMap::from_source(<span class="kw-2">&</span>syntax); |
| <a href=#959 id=959 data-nosnippet>959</a> <span class="kw">let </span>block = syntax.descendants().find_map(ast::BlockExpr::cast).expect(<span class="string">"no block"</span>); |
| <a href=#960 id=960 data-nosnippet>960</a> <span class="macro">assert!</span>(ast_id_map.ast_id_for_block(<span class="kw-2">&</span>block).is_none()); |
| <a href=#961 id=961 data-nosnippet>961</a> } |
| <a href=#962 id=962 data-nosnippet>962</a>} |
| </code></pre></div></section></main></body></html> |
