| <!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/anyhow-1.0.71/src/backtrace.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>backtrace.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="../../anyhow/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="../../anyhow/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> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| <span id="193">193</span> |
| <span id="194">194</span> |
| <span id="195">195</span> |
| <span id="196">196</span> |
| <span id="197">197</span> |
| <span id="198">198</span> |
| <span id="199">199</span> |
| <span id="200">200</span> |
| <span id="201">201</span> |
| <span id="202">202</span> |
| <span id="203">203</span> |
| <span id="204">204</span> |
| <span id="205">205</span> |
| <span id="206">206</span> |
| <span id="207">207</span> |
| <span id="208">208</span> |
| <span id="209">209</span> |
| <span id="210">210</span> |
| <span id="211">211</span> |
| <span id="212">212</span> |
| <span id="213">213</span> |
| <span id="214">214</span> |
| <span id="215">215</span> |
| <span id="216">216</span> |
| <span id="217">217</span> |
| <span id="218">218</span> |
| <span id="219">219</span> |
| <span id="220">220</span> |
| <span id="221">221</span> |
| <span id="222">222</span> |
| <span id="223">223</span> |
| <span id="224">224</span> |
| <span id="225">225</span> |
| <span id="226">226</span> |
| <span id="227">227</span> |
| <span id="228">228</span> |
| <span id="229">229</span> |
| <span id="230">230</span> |
| <span id="231">231</span> |
| <span id="232">232</span> |
| <span id="233">233</span> |
| <span id="234">234</span> |
| <span id="235">235</span> |
| <span id="236">236</span> |
| <span id="237">237</span> |
| <span id="238">238</span> |
| <span id="239">239</span> |
| <span id="240">240</span> |
| <span id="241">241</span> |
| <span id="242">242</span> |
| <span id="243">243</span> |
| <span id="244">244</span> |
| <span id="245">245</span> |
| <span id="246">246</span> |
| <span id="247">247</span> |
| <span id="248">248</span> |
| <span id="249">249</span> |
| <span id="250">250</span> |
| <span id="251">251</span> |
| <span id="252">252</span> |
| <span id="253">253</span> |
| <span id="254">254</span> |
| <span id="255">255</span> |
| <span id="256">256</span> |
| <span id="257">257</span> |
| <span id="258">258</span> |
| <span id="259">259</span> |
| <span id="260">260</span> |
| <span id="261">261</span> |
| <span id="262">262</span> |
| <span id="263">263</span> |
| <span id="264">264</span> |
| <span id="265">265</span> |
| <span id="266">266</span> |
| <span id="267">267</span> |
| <span id="268">268</span> |
| <span id="269">269</span> |
| <span id="270">270</span> |
| <span id="271">271</span> |
| <span id="272">272</span> |
| <span id="273">273</span> |
| <span id="274">274</span> |
| <span id="275">275</span> |
| <span id="276">276</span> |
| <span id="277">277</span> |
| <span id="278">278</span> |
| <span id="279">279</span> |
| <span id="280">280</span> |
| <span id="281">281</span> |
| <span id="282">282</span> |
| <span id="283">283</span> |
| <span id="284">284</span> |
| <span id="285">285</span> |
| <span id="286">286</span> |
| <span id="287">287</span> |
| <span id="288">288</span> |
| <span id="289">289</span> |
| <span id="290">290</span> |
| <span id="291">291</span> |
| <span id="292">292</span> |
| <span id="293">293</span> |
| <span id="294">294</span> |
| <span id="295">295</span> |
| <span id="296">296</span> |
| <span id="297">297</span> |
| <span id="298">298</span> |
| <span id="299">299</span> |
| <span id="300">300</span> |
| <span id="301">301</span> |
| <span id="302">302</span> |
| <span id="303">303</span> |
| <span id="304">304</span> |
| <span id="305">305</span> |
| <span id="306">306</span> |
| <span id="307">307</span> |
| <span id="308">308</span> |
| <span id="309">309</span> |
| <span id="310">310</span> |
| <span id="311">311</span> |
| <span id="312">312</span> |
| <span id="313">313</span> |
| <span id="314">314</span> |
| <span id="315">315</span> |
| <span id="316">316</span> |
| <span id="317">317</span> |
| <span id="318">318</span> |
| <span id="319">319</span> |
| <span id="320">320</span> |
| <span id="321">321</span> |
| <span id="322">322</span> |
| <span id="323">323</span> |
| <span id="324">324</span> |
| <span id="325">325</span> |
| <span id="326">326</span> |
| <span id="327">327</span> |
| <span id="328">328</span> |
| <span id="329">329</span> |
| <span id="330">330</span> |
| <span id="331">331</span> |
| <span id="332">332</span> |
| <span id="333">333</span> |
| <span id="334">334</span> |
| <span id="335">335</span> |
| <span id="336">336</span> |
| <span id="337">337</span> |
| <span id="338">338</span> |
| <span id="339">339</span> |
| <span id="340">340</span> |
| <span id="341">341</span> |
| <span id="342">342</span> |
| <span id="343">343</span> |
| <span id="344">344</span> |
| <span id="345">345</span> |
| <span id="346">346</span> |
| <span id="347">347</span> |
| <span id="348">348</span> |
| <span id="349">349</span> |
| <span id="350">350</span> |
| <span id="351">351</span> |
| <span id="352">352</span> |
| <span id="353">353</span> |
| <span id="354">354</span> |
| <span id="355">355</span> |
| <span id="356">356</span> |
| <span id="357">357</span> |
| <span id="358">358</span> |
| <span id="359">359</span> |
| <span id="360">360</span> |
| <span id="361">361</span> |
| <span id="362">362</span> |
| <span id="363">363</span> |
| <span id="364">364</span> |
| <span id="365">365</span> |
| <span id="366">366</span> |
| <span id="367">367</span> |
| <span id="368">368</span> |
| <span id="369">369</span> |
| <span id="370">370</span> |
| <span id="371">371</span> |
| <span id="372">372</span> |
| <span id="373">373</span> |
| <span id="374">374</span> |
| <span id="375">375</span> |
| <span id="376">376</span> |
| <span id="377">377</span> |
| <span id="378">378</span> |
| <span id="379">379</span> |
| <span id="380">380</span> |
| <span id="381">381</span> |
| <span id="382">382</span> |
| <span id="383">383</span> |
| <span id="384">384</span> |
| <span id="385">385</span> |
| <span id="386">386</span> |
| <span id="387">387</span> |
| <span id="388">388</span> |
| <span id="389">389</span> |
| <span id="390">390</span> |
| <span id="391">391</span> |
| <span id="392">392</span> |
| <span id="393">393</span> |
| <span id="394">394</span> |
| <span id="395">395</span> |
| <span id="396">396</span> |
| <span id="397">397</span> |
| <span id="398">398</span> |
| <span id="399">399</span> |
| <span id="400">400</span> |
| <span id="401">401</span> |
| </pre><pre class="rust"><code><span class="attribute">#[cfg(backtrace)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>std::backtrace::{Backtrace, BacktraceStatus}; |
| |
| <span class="attribute">#[cfg(all(not(backtrace), feature = <span class="string">"backtrace"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span><span class="self">self</span>::capture::{Backtrace, BacktraceStatus}; |
| |
| <span class="attribute">#[cfg(not(any(backtrace, feature = <span class="string">"backtrace"</span>)))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Backtrace {} |
| |
| <span class="attribute">#[cfg(backtrace)] |
| </span><span class="macro">macro_rules! </span>impl_backtrace { |
| () => { |
| std::backtrace::Backtrace |
| }; |
| } |
| |
| <span class="attribute">#[cfg(all(not(backtrace), feature = <span class="string">"backtrace"</span>))] |
| </span><span class="macro">macro_rules! </span>impl_backtrace { |
| () => { |
| <span class="kw">impl </span>core::fmt::Debug + core::fmt::Display |
| }; |
| } |
| |
| <span class="attribute">#[cfg(any(backtrace, feature = <span class="string">"backtrace"</span>))] |
| </span><span class="macro">macro_rules! </span>backtrace { |
| () => { |
| <span class="prelude-val">Some</span>(<span class="kw">crate</span>::backtrace::Backtrace::capture()) |
| }; |
| } |
| |
| <span class="attribute">#[cfg(not(any(backtrace, feature = <span class="string">"backtrace"</span>)))] |
| </span><span class="macro">macro_rules! </span>backtrace { |
| () => { |
| <span class="prelude-val">None |
| </span>}; |
| } |
| |
| <span class="attribute">#[cfg(backtrace)] |
| </span><span class="macro">macro_rules! </span>backtrace_if_absent { |
| (<span class="macro-nonterminal">$err</span>:expr) => { |
| <span class="kw">match </span>(<span class="macro-nonterminal">$err </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>std::error::Error).request_ref::<std::backtrace::Backtrace>() { |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="prelude-val">None</span>, |
| <span class="prelude-val">None </span>=> <span class="macro">backtrace!</span>(), |
| } |
| }; |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"std"</span>, not(backtrace), feature = <span class="string">"backtrace"</span>))] |
| </span><span class="macro">macro_rules! </span>backtrace_if_absent { |
| (<span class="macro-nonterminal">$err</span>:expr) => { |
| <span class="macro">backtrace!</span>() |
| }; |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"std"</span>, not(backtrace), not(feature = <span class="string">"backtrace"</span>)))] |
| </span><span class="macro">macro_rules! </span>backtrace_if_absent { |
| (<span class="macro-nonterminal">$err</span>:expr) => { |
| <span class="prelude-val">None |
| </span>}; |
| } |
| |
| <span class="attribute">#[cfg(all(not(backtrace), feature = <span class="string">"backtrace"</span>))] |
| </span><span class="kw">mod </span>capture { |
| <span class="kw">use </span>backtrace::{BacktraceFmt, BytesOrWideString, Frame, PrintFmt, SymbolName}; |
| <span class="kw">use </span>core::cell::UnsafeCell; |
| <span class="kw">use </span>core::fmt::{<span class="self">self</span>, Debug, Display}; |
| <span class="kw">use </span>core::sync::atomic::{AtomicUsize, Ordering}; |
| <span class="kw">use </span>std::borrow::Cow; |
| <span class="kw">use </span>std::env; |
| <span class="kw">use </span>std::path::{<span class="self">self</span>, Path, PathBuf}; |
| <span class="kw">use </span>std::sync::Once; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Backtrace { |
| inner: Inner, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>BacktraceStatus { |
| Unsupported, |
| Disabled, |
| Captured, |
| } |
| |
| <span class="kw">enum </span>Inner { |
| Unsupported, |
| Disabled, |
| Captured(LazilyResolvedCapture), |
| } |
| |
| <span class="kw">struct </span>Capture { |
| actual_start: usize, |
| resolved: bool, |
| frames: Vec<BacktraceFrame>, |
| } |
| |
| <span class="kw">struct </span>BacktraceFrame { |
| frame: Frame, |
| symbols: Vec<BacktraceSymbol>, |
| } |
| |
| <span class="kw">struct </span>BacktraceSymbol { |
| name: <span class="prelude-ty">Option</span><Vec<u8>>, |
| filename: <span class="prelude-ty">Option</span><BytesOrWide>, |
| lineno: <span class="prelude-ty">Option</span><u32>, |
| colno: <span class="prelude-ty">Option</span><u32>, |
| } |
| |
| <span class="kw">enum </span>BytesOrWide { |
| Bytes(Vec<u8>), |
| Wide(Vec<u16>), |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>Backtrace { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">let </span>capture = <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.inner { |
| Inner::Unsupported => <span class="kw">return </span>fmt.write_str(<span class="string">"<unsupported>"</span>), |
| Inner::Disabled => <span class="kw">return </span>fmt.write_str(<span class="string">"<disabled>"</span>), |
| Inner::Captured(c) => c.force(), |
| }; |
| |
| <span class="kw">let </span>frames = <span class="kw-2">&</span>capture.frames[capture.actual_start..]; |
| |
| <span class="macro">write!</span>(fmt, <span class="string">"Backtrace "</span>)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>dbg = fmt.debug_list(); |
| |
| <span class="kw">for </span>frame <span class="kw">in </span>frames { |
| <span class="kw">if </span>frame.frame.ip().is_null() { |
| <span class="kw">continue</span>; |
| } |
| |
| dbg.entries(<span class="kw-2">&</span>frame.symbols); |
| } |
| |
| dbg.finish() |
| } |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>BacktraceFrame { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">let </span><span class="kw-2">mut </span>dbg = fmt.debug_list(); |
| dbg.entries(<span class="kw-2">&</span><span class="self">self</span>.symbols); |
| dbg.finish() |
| } |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>BacktraceSymbol { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="macro">write!</span>(fmt, <span class="string">"{{ "</span>)<span class="question-mark">?</span>; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(fn_name) = <span class="self">self</span>.name.as_ref().map(|b| SymbolName::new(b)) { |
| <span class="macro">write!</span>(fmt, <span class="string">"fn: \"{:#}\""</span>, fn_name)<span class="question-mark">?</span>; |
| } <span class="kw">else </span>{ |
| <span class="macro">write!</span>(fmt, <span class="string">"fn: <unknown>"</span>)<span class="question-mark">?</span>; |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(fname) = <span class="self">self</span>.filename.as_ref() { |
| <span class="macro">write!</span>(fmt, <span class="string">", file: \"{:?}\""</span>, fname)<span class="question-mark">?</span>; |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(line) = <span class="self">self</span>.lineno { |
| <span class="macro">write!</span>(fmt, <span class="string">", line: {:?}"</span>, line)<span class="question-mark">?</span>; |
| } |
| |
| <span class="macro">write!</span>(fmt, <span class="string">" }}"</span>) |
| } |
| } |
| |
| <span class="kw">impl </span>Debug <span class="kw">for </span>BytesOrWide { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| output_filename( |
| fmt, |
| <span class="kw">match </span><span class="self">self </span>{ |
| BytesOrWide::Bytes(w) => BytesOrWideString::Bytes(w), |
| BytesOrWide::Wide(w) => BytesOrWideString::Wide(w), |
| }, |
| PrintFmt::Short, |
| env::current_dir().as_ref().ok(), |
| ) |
| } |
| } |
| |
| <span class="kw">impl </span>Backtrace { |
| <span class="kw">fn </span>enabled() -> bool { |
| <span class="kw">static </span>ENABLED: AtomicUsize = AtomicUsize::new(<span class="number">0</span>); |
| <span class="kw">match </span>ENABLED.load(Ordering::Relaxed) { |
| <span class="number">0 </span>=> {} |
| <span class="number">1 </span>=> <span class="kw">return </span><span class="bool-val">false</span>, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="bool-val">true</span>, |
| } |
| <span class="kw">let </span>enabled = <span class="kw">match </span>env::var_os(<span class="string">"RUST_LIB_BACKTRACE"</span>) { |
| <span class="prelude-val">Some</span>(s) => s != <span class="string">"0"</span>, |
| <span class="prelude-val">None </span>=> <span class="kw">match </span>env::var_os(<span class="string">"RUST_BACKTRACE"</span>) { |
| <span class="prelude-val">Some</span>(s) => s != <span class="string">"0"</span>, |
| <span class="prelude-val">None </span>=> <span class="bool-val">false</span>, |
| }, |
| }; |
| ENABLED.store(enabled <span class="kw">as </span>usize + <span class="number">1</span>, Ordering::Relaxed); |
| enabled |
| } |
| |
| <span class="attribute">#[inline(never)] </span><span class="comment">// want to make sure there's a frame here to remove |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>capture() -> Backtrace { |
| <span class="kw">if </span>Backtrace::enabled() { |
| Backtrace::create(Backtrace::capture <span class="kw">as </span>usize) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>inner = Inner::Disabled; |
| Backtrace { inner } |
| } |
| } |
| |
| <span class="comment">// Capture a backtrace which starts just before the function addressed |
| // by `ip` |
| </span><span class="kw">fn </span>create(ip: usize) -> Backtrace { |
| <span class="kw">let </span><span class="kw-2">mut </span>frames = Vec::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>actual_start = <span class="prelude-val">None</span>; |
| backtrace::trace(|frame| { |
| frames.push(BacktraceFrame { |
| frame: frame.clone(), |
| symbols: Vec::new(), |
| }); |
| <span class="kw">if </span>frame.symbol_address() <span class="kw">as </span>usize == ip && actual_start.is_none() { |
| actual_start = <span class="prelude-val">Some</span>(frames.len() + <span class="number">1</span>); |
| } |
| <span class="bool-val">true |
| </span>}); |
| |
| <span class="comment">// If no frames came out assume that this is an unsupported platform |
| // since `backtrace` doesn't provide a way of learning this right |
| // now, and this should be a good enough approximation. |
| </span><span class="kw">let </span>inner = <span class="kw">if </span>frames.is_empty() { |
| Inner::Unsupported |
| } <span class="kw">else </span>{ |
| Inner::Captured(LazilyResolvedCapture::new(Capture { |
| actual_start: actual_start.unwrap_or(<span class="number">0</span>), |
| frames, |
| resolved: <span class="bool-val">false</span>, |
| })) |
| }; |
| |
| Backtrace { inner } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>status(<span class="kw-2">&</span><span class="self">self</span>) -> BacktraceStatus { |
| <span class="kw">match </span><span class="self">self</span>.inner { |
| Inner::Unsupported => BacktraceStatus::Unsupported, |
| Inner::Disabled => BacktraceStatus::Disabled, |
| Inner::Captured(<span class="kw">_</span>) => BacktraceStatus::Captured, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>Backtrace { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">let </span>capture = <span class="kw">match </span><span class="kw-2">&</span><span class="self">self</span>.inner { |
| Inner::Unsupported => <span class="kw">return </span>fmt.write_str(<span class="string">"unsupported backtrace"</span>), |
| Inner::Disabled => <span class="kw">return </span>fmt.write_str(<span class="string">"disabled backtrace"</span>), |
| Inner::Captured(c) => c.force(), |
| }; |
| |
| <span class="kw">let </span>full = fmt.alternate(); |
| <span class="kw">let </span>(frames, style) = <span class="kw">if </span>full { |
| (<span class="kw-2">&</span>capture.frames[..], PrintFmt::Full) |
| } <span class="kw">else </span>{ |
| (<span class="kw-2">&</span>capture.frames[capture.actual_start..], PrintFmt::Short) |
| }; |
| |
| <span class="comment">// When printing paths we try to strip the cwd if it exists, |
| // otherwise we just print the path as-is. Note that we also only do |
| // this for the short format, because if it's full we presumably |
| // want to print everything. |
| </span><span class="kw">let </span>cwd = env::current_dir(); |
| <span class="kw">let </span><span class="kw-2">mut </span>print_path = <span class="kw">move </span>|fmt: <span class="kw-2">&mut </span>fmt::Formatter, path: BytesOrWideString| { |
| output_filename(fmt, path, style, cwd.as_ref().ok()) |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>f = BacktraceFmt::new(fmt, style, <span class="kw-2">&mut </span>print_path); |
| f.add_context()<span class="question-mark">?</span>; |
| <span class="kw">for </span>frame <span class="kw">in </span>frames { |
| <span class="kw">let </span><span class="kw-2">mut </span>f = f.frame(); |
| <span class="kw">if </span>frame.symbols.is_empty() { |
| f.print_raw(frame.frame.ip(), <span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>)<span class="question-mark">?</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">for </span>symbol <span class="kw">in </span>frame.symbols.iter() { |
| f.print_raw_with_column( |
| frame.frame.ip(), |
| symbol.name.as_ref().map(|b| SymbolName::new(b)), |
| symbol.filename.as_ref().map(|b| <span class="kw">match </span>b { |
| BytesOrWide::Bytes(w) => BytesOrWideString::Bytes(w), |
| BytesOrWide::Wide(w) => BytesOrWideString::Wide(w), |
| }), |
| symbol.lineno, |
| symbol.colno, |
| )<span class="question-mark">?</span>; |
| } |
| } |
| } |
| f.finish()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">struct </span>LazilyResolvedCapture { |
| sync: Once, |
| capture: UnsafeCell<Capture>, |
| } |
| |
| <span class="kw">impl </span>LazilyResolvedCapture { |
| <span class="kw">fn </span>new(capture: Capture) -> <span class="self">Self </span>{ |
| LazilyResolvedCapture { |
| sync: Once::new(), |
| capture: UnsafeCell::new(capture), |
| } |
| } |
| |
| <span class="kw">fn </span>force(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Capture { |
| <span class="self">self</span>.sync.call_once(|| { |
| <span class="comment">// Safety: This exclusive reference can't overlap with any |
| // others. `Once` guarantees callers will block until this |
| // closure returns. `Once` also guarantees only a single caller |
| // will enter this closure. |
| </span><span class="kw">unsafe </span>{ <span class="kw-2">&mut *</span><span class="self">self</span>.capture.get() }.resolve(); |
| }); |
| |
| <span class="comment">// Safety: This shared reference can't overlap with the exclusive |
| // reference above. |
| </span><span class="kw">unsafe </span>{ <span class="kw-2">&*</span><span class="self">self</span>.capture.get() } |
| } |
| } |
| |
| <span class="comment">// Safety: Access to the inner value is synchronized using a thread-safe |
| // `Once`. So long as `Capture` is `Sync`, `LazilyResolvedCapture` is too |
| </span><span class="kw">unsafe impl </span>Sync <span class="kw">for </span>LazilyResolvedCapture <span class="kw">where </span>Capture: Sync {} |
| |
| <span class="kw">impl </span>Capture { |
| <span class="kw">fn </span>resolve(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// If we're already resolved, nothing to do! |
| </span><span class="kw">if </span><span class="self">self</span>.resolved { |
| <span class="kw">return</span>; |
| } |
| <span class="self">self</span>.resolved = <span class="bool-val">true</span>; |
| |
| <span class="kw">for </span>frame <span class="kw">in </span><span class="self">self</span>.frames.iter_mut() { |
| <span class="kw">let </span>symbols = <span class="kw-2">&mut </span>frame.symbols; |
| <span class="kw">let </span>frame = <span class="kw-2">&</span>frame.frame; |
| backtrace::resolve_frame(frame, |symbol| { |
| symbols.push(BacktraceSymbol { |
| name: symbol.name().map(|m| m.as_bytes().to_vec()), |
| filename: symbol.filename_raw().map(|b| <span class="kw">match </span>b { |
| BytesOrWideString::Bytes(b) => BytesOrWide::Bytes(b.to_owned()), |
| BytesOrWideString::Wide(b) => BytesOrWide::Wide(b.to_owned()), |
| }), |
| lineno: symbol.lineno(), |
| colno: symbol.colno(), |
| }); |
| }); |
| } |
| } |
| } |
| |
| <span class="comment">// Prints the filename of the backtrace frame. |
| </span><span class="kw">fn </span>output_filename( |
| fmt: <span class="kw-2">&mut </span>fmt::Formatter, |
| bows: BytesOrWideString, |
| print_fmt: PrintFmt, |
| cwd: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>PathBuf>, |
| ) -> fmt::Result { |
| <span class="kw">let </span>file: Cow<Path> = <span class="kw">match </span>bows { |
| <span class="attribute">#[cfg(unix)] |
| </span>BytesOrWideString::Bytes(bytes) => { |
| <span class="kw">use </span>std::os::unix::ffi::OsStrExt; |
| Path::new(std::ffi::OsStr::from_bytes(bytes)).into() |
| } |
| <span class="attribute">#[cfg(not(unix))] |
| </span>BytesOrWideString::Bytes(bytes) => { |
| Path::new(std::str::from_utf8(bytes).unwrap_or(<span class="string">"<unknown>"</span>)).into() |
| } |
| <span class="attribute">#[cfg(windows)] |
| </span>BytesOrWideString::Wide(wide) => { |
| <span class="kw">use </span>std::os::windows::ffi::OsStringExt; |
| Cow::Owned(std::ffi::OsString::from_wide(wide).into()) |
| } |
| <span class="attribute">#[cfg(not(windows))] |
| </span>BytesOrWideString::Wide(_wide) => Path::new(<span class="string">"<unknown>"</span>).into(), |
| }; |
| <span class="kw">if </span>print_fmt == PrintFmt::Short && file.is_absolute() { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(cwd) = cwd { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(stripped) = file.strip_prefix(<span class="kw-2">&</span>cwd) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(s) = stripped.to_str() { |
| <span class="kw">return </span><span class="macro">write!</span>(fmt, <span class="string">".{}{}"</span>, path::MAIN_SEPARATOR, s); |
| } |
| } |
| } |
| } |
| Display::fmt(<span class="kw-2">&</span>file.display(), fmt) |
| } |
| } |
| |
| <span class="kw">fn </span>_assert_send_sync() { |
| <span class="kw">fn </span>_assert<T: Send + Sync>() {} |
| _assert::<Backtrace>(); |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="anyhow" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
