| <!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 `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/aho-corasick-1.0.2/src/packed/teddy/compile.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>compile.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../aho_corasick/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../aho_corasick/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// See the README in this directory for an explanation of the Teddy algorithm. |
| |
| </span><span class="kw">use </span>core::{cmp, fmt}; |
| |
| <span class="kw">use </span>alloc::{collections::BTreeMap, format, vec, vec::Vec}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::packed::{ |
| pattern::{PatternID, Patterns}, |
| teddy::Teddy, |
| }; |
| |
| <span class="doccomment">/// A builder for constructing a Teddy matcher. |
| /// |
| /// The builder primarily permits fine grained configuration of the Teddy |
| /// matcher. Most options are made only available for testing/benchmarking |
| /// purposes. In reality, options are automatically determined by the nature |
| /// and number of patterns given to the builder. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>Builder { |
| <span class="doccomment">/// When none, this is automatically determined. Otherwise, `false` means |
| /// slim Teddy is used (8 buckets) and `true` means fat Teddy is used |
| /// (16 buckets). Fat Teddy requires AVX2, so if that CPU feature isn't |
| /// available and Fat Teddy was requested, no matcher will be built. |
| </span>fat: <span class="prelude-ty">Option</span><bool>, |
| <span class="doccomment">/// When none, this is automatically determined. Otherwise, `false` means |
| /// that 128-bit vectors will be used (up to SSSE3 instructions) where as |
| /// `true` means that 256-bit vectors will be used. As with `fat`, if |
| /// 256-bit vectors are requested and they aren't available, then a |
| /// searcher will not be built. |
| </span>avx: <span class="prelude-ty">Option</span><bool>, |
| } |
| |
| <span class="kw">impl </span>Default <span class="kw">for </span>Builder { |
| <span class="kw">fn </span>default() -> Builder { |
| Builder::new() |
| } |
| } |
| |
| <span class="kw">impl </span>Builder { |
| <span class="doccomment">/// Create a new builder for configuring a Teddy matcher. |
| </span><span class="kw">pub fn </span>new() -> Builder { |
| Builder { fat: <span class="prelude-val">None</span>, avx: <span class="prelude-val">None </span>} |
| } |
| |
| <span class="doccomment">/// Build a matcher for the set of patterns given. If a matcher could not |
| /// be built, then `None` is returned. |
| /// |
| /// Generally, a matcher isn't built if the necessary CPU features aren't |
| /// available, an unsupported target or if the searcher is believed to be |
| /// slower than standard techniques (i.e., if there are too many literals). |
| </span><span class="kw">pub fn </span>build(<span class="kw-2">&</span><span class="self">self</span>, patterns: <span class="kw-2">&</span>Patterns) -> <span class="prelude-ty">Option</span><Teddy> { |
| <span class="self">self</span>.build_imp(patterns) |
| } |
| |
| <span class="doccomment">/// Require the use of Fat (true) or Slim (false) Teddy. Fat Teddy uses |
| /// 16 buckets where as Slim Teddy uses 8 buckets. More buckets are useful |
| /// for a larger set of literals. |
| /// |
| /// `None` is the default, which results in an automatic selection based |
| /// on the number of literals and available CPU features. |
| </span><span class="kw">pub fn </span>fat(<span class="kw-2">&mut </span><span class="self">self</span>, yes: <span class="prelude-ty">Option</span><bool>) -> <span class="kw-2">&mut </span>Builder { |
| <span class="self">self</span>.fat = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="doccomment">/// Request the use of 256-bit vectors (true) or 128-bit vectors (false). |
| /// Generally, a larger vector size is better since it either permits |
| /// matching more patterns or matching more bytes in the haystack at once. |
| /// |
| /// `None` is the default, which results in an automatic selection based on |
| /// the number of literals and available CPU features. |
| </span><span class="kw">pub fn </span>avx(<span class="kw-2">&mut </span><span class="self">self</span>, yes: <span class="prelude-ty">Option</span><bool>) -> <span class="kw-2">&mut </span>Builder { |
| <span class="self">self</span>.avx = yes; |
| <span class="self">self |
| </span>} |
| |
| <span class="kw">fn </span>build_imp(<span class="kw-2">&</span><span class="self">self</span>, patterns: <span class="kw-2">&</span>Patterns) -> <span class="prelude-ty">Option</span><Teddy> { |
| <span class="kw">use </span><span class="kw">crate</span>::packed::teddy::runtime; |
| |
| <span class="comment">// Most of the logic here is just about selecting the optimal settings, |
| // or perhaps even rejecting construction altogether. The choices |
| // we have are: fat (avx only) or not, ssse3 or avx2, and how many |
| // patterns we allow ourselves to search. Additionally, for testing |
| // and benchmarking, we permit callers to try to "force" a setting, |
| // and if the setting isn't allowed (e.g., forcing AVX when AVX isn't |
| // available), then we bail and return nothing. |
| |
| </span><span class="kw">if </span>patterns.len() > <span class="number">64 </span>{ |
| <span class="macro">debug!</span>(<span class="string">"skipping Teddy because of too many patterns"</span>); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span>has_ssse3 = <span class="macro">std::is_x86_feature_detected!</span>(<span class="string">"ssse3"</span>); |
| <span class="kw">let </span>has_avx = <span class="macro">std::is_x86_feature_detected!</span>(<span class="string">"avx2"</span>); |
| <span class="kw">let </span>avx = <span class="kw">if </span><span class="self">self</span>.avx == <span class="prelude-val">Some</span>(<span class="bool-val">true</span>) { |
| <span class="kw">if </span>!has_avx { |
| <span class="macro">debug!</span>( |
| <span class="string">"skipping Teddy because avx was demanded but unavailable" |
| </span>); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="bool-val">true |
| </span>} <span class="kw">else if </span><span class="self">self</span>.avx == <span class="prelude-val">Some</span>(<span class="bool-val">false</span>) { |
| <span class="kw">if </span>!has_ssse3 { |
| <span class="macro">debug!</span>( |
| <span class="string">"skipping Teddy because ssse3 was demanded but unavailable" |
| </span>); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="bool-val">false |
| </span>} <span class="kw">else if </span>!has_ssse3 && !has_avx { |
| <span class="macro">debug!</span>(<span class="string">"skipping Teddy because ssse3 and avx are unavailable"</span>); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } <span class="kw">else </span>{ |
| has_avx |
| }; |
| <span class="kw">let </span>fat = <span class="kw">match </span><span class="self">self</span>.fat { |
| <span class="prelude-val">None </span>=> avx && patterns.len() > <span class="number">32</span>, |
| <span class="prelude-val">Some</span>(<span class="bool-val">false</span>) => <span class="bool-val">false</span>, |
| <span class="prelude-val">Some</span>(<span class="bool-val">true</span>) <span class="kw">if </span>!avx => { |
| <span class="macro">debug!</span>( |
| <span class="string">"skipping Teddy because it needs to be fat, but fat \ |
| Teddy requires avx which is unavailable" |
| </span>); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="prelude-val">Some</span>(<span class="bool-val">true</span>) => <span class="bool-val">true</span>, |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>compiler = Compiler::new(patterns, fat); |
| compiler.compile(); |
| <span class="kw">let </span>Compiler { buckets, masks, .. } = compiler; |
| <span class="comment">// SAFETY: It is required that the builder only produce Teddy matchers |
| // that are allowed to run on the current CPU, since we later assume |
| // that the presence of (for example) TeddySlim1Mask256 means it is |
| // safe to call functions marked with the `avx2` target feature. |
| </span><span class="kw">match </span>(masks.len(), avx, fat) { |
| (<span class="number">1</span>, <span class="bool-val">false</span>, <span class="kw">_</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 128-bit slim, 1 byte"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddySlim1Mask128( |
| runtime::TeddySlim1Mask128 { |
| mask1: runtime::Mask128::new(masks[<span class="number">0</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">1</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 256-bit slim, 1 byte"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddySlim1Mask256( |
| runtime::TeddySlim1Mask256 { |
| mask1: runtime::Mask256::new(masks[<span class="number">0</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">1</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 256-bit fat, 1 byte"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddyFat1Mask256( |
| runtime::TeddyFat1Mask256 { |
| mask1: runtime::Mask256::new(masks[<span class="number">0</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">2</span>, <span class="bool-val">false</span>, <span class="kw">_</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 128-bit slim, 2 bytes"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddySlim2Mask128( |
| runtime::TeddySlim2Mask128 { |
| mask1: runtime::Mask128::new(masks[<span class="number">0</span>]), |
| mask2: runtime::Mask128::new(masks[<span class="number">1</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">2</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 256-bit slim, 2 bytes"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddySlim2Mask256( |
| runtime::TeddySlim2Mask256 { |
| mask1: runtime::Mask256::new(masks[<span class="number">0</span>]), |
| mask2: runtime::Mask256::new(masks[<span class="number">1</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">2</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 256-bit fat, 2 bytes"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddyFat2Mask256( |
| runtime::TeddyFat2Mask256 { |
| mask1: runtime::Mask256::new(masks[<span class="number">0</span>]), |
| mask2: runtime::Mask256::new(masks[<span class="number">1</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">3</span>, <span class="bool-val">false</span>, <span class="kw">_</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 128-bit slim, 3 bytes"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddySlim3Mask128( |
| runtime::TeddySlim3Mask128 { |
| mask1: runtime::Mask128::new(masks[<span class="number">0</span>]), |
| mask2: runtime::Mask128::new(masks[<span class="number">1</span>]), |
| mask3: runtime::Mask128::new(masks[<span class="number">2</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">3</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 256-bit slim, 3 bytes"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddySlim3Mask256( |
| runtime::TeddySlim3Mask256 { |
| mask1: runtime::Mask256::new(masks[<span class="number">0</span>]), |
| mask2: runtime::Mask256::new(masks[<span class="number">1</span>]), |
| mask3: runtime::Mask256::new(masks[<span class="number">2</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">3</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 256-bit fat, 3 bytes"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddyFat3Mask256( |
| runtime::TeddyFat3Mask256 { |
| mask1: runtime::Mask256::new(masks[<span class="number">0</span>]), |
| mask2: runtime::Mask256::new(masks[<span class="number">1</span>]), |
| mask3: runtime::Mask256::new(masks[<span class="number">2</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">4</span>, <span class="bool-val">false</span>, <span class="kw">_</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 128-bit slim, 4 bytes"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddySlim4Mask128( |
| runtime::TeddySlim4Mask128 { |
| mask1: runtime::Mask128::new(masks[<span class="number">0</span>]), |
| mask2: runtime::Mask128::new(masks[<span class="number">1</span>]), |
| mask3: runtime::Mask128::new(masks[<span class="number">2</span>]), |
| mask4: runtime::Mask128::new(masks[<span class="number">3</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">4</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 256-bit slim, 4 bytes"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddySlim4Mask256( |
| runtime::TeddySlim4Mask256 { |
| mask1: runtime::Mask256::new(masks[<span class="number">0</span>]), |
| mask2: runtime::Mask256::new(masks[<span class="number">1</span>]), |
| mask3: runtime::Mask256::new(masks[<span class="number">2</span>]), |
| mask4: runtime::Mask256::new(masks[<span class="number">3</span>]), |
| }, |
| ), |
| }) |
| } |
| (<span class="number">4</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>) => { |
| <span class="macro">debug!</span>(<span class="string">"Teddy choice: 256-bit fat, 4 bytes"</span>); |
| <span class="prelude-val">Some</span>(Teddy { |
| buckets, |
| max_pattern_id: patterns.max_pattern_id(), |
| exec: runtime::Exec::TeddyFat4Mask256( |
| runtime::TeddyFat4Mask256 { |
| mask1: runtime::Mask256::new(masks[<span class="number">0</span>]), |
| mask2: runtime::Mask256::new(masks[<span class="number">1</span>]), |
| mask3: runtime::Mask256::new(masks[<span class="number">2</span>]), |
| mask4: runtime::Mask256::new(masks[<span class="number">3</span>]), |
| }, |
| ), |
| }) |
| } |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A compiler is in charge of allocating patterns into buckets and generating |
| /// the masks necessary for searching. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">struct </span>Compiler<<span class="lifetime">'p</span>> { |
| patterns: <span class="kw-2">&</span><span class="lifetime">'p </span>Patterns, |
| buckets: Vec<Vec<PatternID>>, |
| masks: Vec<Mask>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'p</span>> Compiler<<span class="lifetime">'p</span>> { |
| <span class="doccomment">/// Create a new Teddy compiler for the given patterns. If `fat` is true, |
| /// then 16 buckets will be used instead of 8. |
| /// |
| /// This panics if any of the patterns given are empty. |
| </span><span class="kw">fn </span>new(patterns: <span class="kw-2">&</span><span class="lifetime">'p </span>Patterns, fat: bool) -> Compiler<<span class="lifetime">'p</span>> { |
| <span class="kw">let </span>mask_len = cmp::min(<span class="number">4</span>, patterns.minimum_len()); |
| <span class="macro">assert!</span>(<span class="number">1 </span><= mask_len && mask_len <= <span class="number">4</span>); |
| |
| Compiler { |
| patterns, |
| buckets: <span class="macro">vec!</span>[<span class="macro">vec!</span>[]; <span class="kw">if </span>fat { <span class="number">16 </span>} <span class="kw">else </span>{ <span class="number">8 </span>}], |
| masks: <span class="macro">vec!</span>[Mask::default(); mask_len], |
| } |
| } |
| |
| <span class="doccomment">/// Compile the patterns in this compiler into buckets and masks. |
| </span><span class="kw">fn </span>compile(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">let </span><span class="kw-2">mut </span>lonibble_to_bucket: BTreeMap<Vec<u8>, usize> = BTreeMap::new(); |
| <span class="kw">for </span>(id, pattern) <span class="kw">in </span><span class="self">self</span>.patterns.iter() { |
| <span class="comment">// We try to be slightly clever in how we assign patterns into |
| // buckets. Generally speaking, we want patterns with the same |
| // prefix to be in the same bucket, since it minimizes the amount |
| // of time we spend churning through buckets in the verification |
| // step. |
| // |
| // So we could assign patterns with the same N-prefix (where N |
| // is the size of the mask, which is one of {1, 2, 3}) to the |
| // same bucket. However, case insensitive searches are fairly |
| // common, so we'd for example, ideally want to treat `abc` and |
| // `ABC` as if they shared the same prefix. ASCII has the nice |
| // property that the lower 4 bits of A and a are the same, so we |
| // therefore group patterns with the same low-nybbe-N-prefix into |
| // the same bucket. |
| // |
| // MOREOVER, this is actually necessary for correctness! In |
| // particular, by grouping patterns with the same prefix into the |
| // same bucket, we ensure that we preserve correct leftmost-first |
| // and leftmost-longest match semantics. In addition to the fact |
| // that `patterns.iter()` iterates in the correct order, this |
| // guarantees that all possible ambiguous matches will occur in |
| // the same bucket. The verification routine could be adjusted to |
| // support correct leftmost match semantics regardless of bucket |
| // allocation, but that results in a performance hit. It's much |
| // nicer to be able to just stop as soon as a match is found. |
| </span><span class="kw">let </span>lonybs = pattern.low_nybbles(<span class="self">self</span>.masks.len()); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span>bucket) = lonibble_to_bucket.get(<span class="kw-2">&</span>lonybs) { |
| <span class="self">self</span>.buckets[bucket].push(id); |
| } <span class="kw">else </span>{ |
| <span class="comment">// N.B. We assign buckets in reverse because it shouldn't have |
| // any influence on performance, but it does make it harder to |
| // get leftmost match semantics accidentally correct. |
| </span><span class="kw">let </span>bucket = (<span class="self">self</span>.buckets.len() - <span class="number">1</span>) |
| - (id <span class="kw">as </span>usize % <span class="self">self</span>.buckets.len()); |
| <span class="self">self</span>.buckets[bucket].push(id); |
| lonibble_to_bucket.insert(lonybs, bucket); |
| } |
| } |
| <span class="kw">for </span>(bucket_index, bucket) <span class="kw">in </span><span class="self">self</span>.buckets.iter().enumerate() { |
| <span class="kw">for </span><span class="kw-2">&</span>pat_id <span class="kw">in </span>bucket { |
| <span class="kw">let </span>pat = <span class="self">self</span>.patterns.get(pat_id); |
| <span class="kw">for </span>(i, mask) <span class="kw">in </span><span class="self">self</span>.masks.iter_mut().enumerate() { |
| <span class="kw">if </span><span class="self">self</span>.buckets.len() == <span class="number">8 </span>{ |
| mask.add_slim(bucket_index <span class="kw">as </span>u8, pat.bytes()[i]); |
| } <span class="kw">else </span>{ |
| mask.add_fat(bucket_index <span class="kw">as </span>u8, pat.bytes()[i]); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'p</span>> fmt::Debug <span class="kw">for </span>Compiler<<span class="lifetime">'p</span>> { |
| <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 { |
| <span class="kw">let </span><span class="kw-2">mut </span>buckets = <span class="macro">vec!</span>[<span class="macro">vec!</span>[]; <span class="self">self</span>.buckets.len()]; |
| <span class="kw">for </span>(i, bucket) <span class="kw">in </span><span class="self">self</span>.buckets.iter().enumerate() { |
| <span class="kw">for </span><span class="kw-2">&</span>patid <span class="kw">in </span>bucket { |
| buckets[i].push(<span class="self">self</span>.patterns.get(patid)); |
| } |
| } |
| f.debug_struct(<span class="string">"Compiler"</span>) |
| .field(<span class="string">"buckets"</span>, <span class="kw-2">&</span>buckets) |
| .field(<span class="string">"masks"</span>, <span class="kw-2">&</span><span class="self">self</span>.masks) |
| .finish() |
| } |
| } |
| |
| <span class="doccomment">/// Mask represents the low and high nybble masks that will be used during |
| /// search. Each mask is 32 bytes wide, although only the first 16 bytes are |
| /// used for the SSSE3 runtime. |
| /// |
| /// Each byte in the mask corresponds to a 8-bit bitset, where bit `i` is set |
| /// if and only if the corresponding nybble is in the ith bucket. The index of |
| /// the byte (0-15, inclusive) corresponds to the nybble. |
| /// |
| /// Each mask is used as the target of a shuffle, where the indices for the |
| /// shuffle are taken from the haystack. AND'ing the shuffles for both the |
| /// low and high masks together also results in 8-bit bitsets, but where bit |
| /// `i` is set if and only if the correspond *byte* is in the ith bucket. |
| /// |
| /// During compilation, masks are just arrays. But during search, these masks |
| /// are represented as 128-bit or 256-bit vectors. |
| /// |
| /// (See the README is this directory for more details.) |
| </span><span class="attribute">#[derive(Clone, Copy, Default)] |
| </span><span class="kw">pub struct </span>Mask { |
| lo: [u8; <span class="number">32</span>], |
| hi: [u8; <span class="number">32</span>], |
| } |
| |
| <span class="kw">impl </span>Mask { |
| <span class="doccomment">/// Update this mask by adding the given byte to the given bucket. The |
| /// given bucket must be in the range 0-7. |
| /// |
| /// This is for "slim" Teddy, where there are only 8 buckets. |
| </span><span class="kw">fn </span>add_slim(<span class="kw-2">&mut </span><span class="self">self</span>, bucket: u8, byte: u8) { |
| <span class="macro">assert!</span>(bucket < <span class="number">8</span>); |
| |
| <span class="kw">let </span>byte_lo = (byte & <span class="number">0xF</span>) <span class="kw">as </span>usize; |
| <span class="kw">let </span>byte_hi = ((byte >> <span class="number">4</span>) & <span class="number">0xF</span>) <span class="kw">as </span>usize; |
| <span class="comment">// When using 256-bit vectors, we need to set this bucket assignment in |
| // the low and high 128-bit portions of the mask. This allows us to |
| // process 32 bytes at a time. Namely, AVX2 shuffles operate on each |
| // of the 128-bit lanes, rather than the full 256-bit vector at once. |
| </span><span class="self">self</span>.lo[byte_lo] |= <span class="number">1 </span><< bucket; |
| <span class="self">self</span>.lo[byte_lo + <span class="number">16</span>] |= <span class="number">1 </span><< bucket; |
| <span class="self">self</span>.hi[byte_hi] |= <span class="number">1 </span><< bucket; |
| <span class="self">self</span>.hi[byte_hi + <span class="number">16</span>] |= <span class="number">1 </span><< bucket; |
| } |
| |
| <span class="doccomment">/// Update this mask by adding the given byte to the given bucket. The |
| /// given bucket must be in the range 0-15. |
| /// |
| /// This is for "fat" Teddy, where there are 16 buckets. |
| </span><span class="kw">fn </span>add_fat(<span class="kw-2">&mut </span><span class="self">self</span>, bucket: u8, byte: u8) { |
| <span class="macro">assert!</span>(bucket < <span class="number">16</span>); |
| |
| <span class="kw">let </span>byte_lo = (byte & <span class="number">0xF</span>) <span class="kw">as </span>usize; |
| <span class="kw">let </span>byte_hi = ((byte >> <span class="number">4</span>) & <span class="number">0xF</span>) <span class="kw">as </span>usize; |
| <span class="comment">// Unlike slim teddy, fat teddy only works with AVX2. For fat teddy, |
| // the high 128 bits of our mask correspond to buckets 8-15, while the |
| // low 128 bits correspond to buckets 0-7. |
| </span><span class="kw">if </span>bucket < <span class="number">8 </span>{ |
| <span class="self">self</span>.lo[byte_lo] |= <span class="number">1 </span><< bucket; |
| <span class="self">self</span>.hi[byte_hi] |= <span class="number">1 </span><< bucket; |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.lo[byte_lo + <span class="number">16</span>] |= <span class="number">1 </span><< (bucket % <span class="number">8</span>); |
| <span class="self">self</span>.hi[byte_hi + <span class="number">16</span>] |= <span class="number">1 </span><< (bucket % <span class="number">8</span>); |
| } |
| } |
| |
| <span class="doccomment">/// Return the low 128 bits of the low-nybble mask. |
| </span><span class="kw">pub fn </span>lo128(<span class="kw-2">&</span><span class="self">self</span>) -> [u8; <span class="number">16</span>] { |
| <span class="kw">let </span><span class="kw-2">mut </span>tmp = [<span class="number">0</span>; <span class="number">16</span>]; |
| tmp.copy_from_slice(<span class="kw-2">&</span><span class="self">self</span>.lo[..<span class="number">16</span>]); |
| tmp |
| } |
| |
| <span class="doccomment">/// Return the full low-nybble mask. |
| </span><span class="kw">pub fn </span>lo256(<span class="kw-2">&</span><span class="self">self</span>) -> [u8; <span class="number">32</span>] { |
| <span class="self">self</span>.lo |
| } |
| |
| <span class="doccomment">/// Return the low 128 bits of the high-nybble mask. |
| </span><span class="kw">pub fn </span>hi128(<span class="kw-2">&</span><span class="self">self</span>) -> [u8; <span class="number">16</span>] { |
| <span class="kw">let </span><span class="kw-2">mut </span>tmp = [<span class="number">0</span>; <span class="number">16</span>]; |
| tmp.copy_from_slice(<span class="kw-2">&</span><span class="self">self</span>.hi[..<span class="number">16</span>]); |
| tmp |
| } |
| |
| <span class="doccomment">/// Return the full high-nybble mask. |
| </span><span class="kw">pub fn </span>hi256(<span class="kw-2">&</span><span class="self">self</span>) -> [u8; <span class="number">32</span>] { |
| <span class="self">self</span>.hi |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Mask { |
| <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 { |
| <span class="kw">let </span>(<span class="kw-2">mut </span>parts_lo, <span class="kw-2">mut </span>parts_hi) = (<span class="macro">vec!</span>[], <span class="macro">vec!</span>[]); |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">32 </span>{ |
| parts_lo.push(<span class="macro">format!</span>(<span class="string">"{:02}: {:08b}"</span>, i, <span class="self">self</span>.lo[i])); |
| parts_hi.push(<span class="macro">format!</span>(<span class="string">"{:02}: {:08b}"</span>, i, <span class="self">self</span>.hi[i])); |
| } |
| f.debug_struct(<span class="string">"Mask"</span>) |
| .field(<span class="string">"lo"</span>, <span class="kw-2">&</span>parts_lo) |
| .field(<span class="string">"hi"</span>, <span class="kw-2">&</span>parts_hi) |
| .finish() |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="aho_corasick" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
