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<!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="API documentation for the Rust `resolve` fn in crate `backtrace`."><meta name="keywords" content="rust, rustlang, rust-lang, resolve"><title>backtrace::resolve - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../backtrace/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='index.html'>backtrace</a></p><script>window.sidebarCurrent = {name: 'resolve', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/backtrace/symbolize/mod.rs.html#61-64' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='index.html'>backtrace</a>::<wbr><a class="fn" href=''>resolve</a></span></h1><pre class='rust fn'>pub fn resolve<F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="../backtrace/struct.Symbol.html" title="struct backtrace::Symbol">Symbol</a>)>(addr: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut </a><a class="enum" href="https://doc.rust-lang.org/nightly/core/ffi/enum.c_void.html" title="enum core::ffi::c_void">c_void</a>, cb: F)</pre><div class='docblock'><p>Resolve an address to a symbol, passing the symbol to the specified
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closure.</p>
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<p>This function will look up the given address in areas such as the local
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symbol table, dynamic symbol table, or DWARF debug info (depending on the
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activated implementation) to find symbols to yield.</p>
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<p>The closure may not be called if resolution could not be performed, and it
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also may be called more than once in the case of inlined functions.</p>
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<p>Symbols yielded represent the execution at the specified <code>addr</code>, returning
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file/line pairs for that address (if available).</p>
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<p>Note that if you have a <code>Frame</code> then it's recommended to use the
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<code>resolve_frame</code> function instead of this one.</p>
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<h1 id="required-features" class="section-header"><a href="#required-features">Required features</a></h1>
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<p>This function requires the <code>std</code> feature of the <code>backtrace</code> crate to be
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enabled, and the <code>std</code> feature is enabled by default.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>This function strives to never panic, but if the <code>cb</code> provided panics then
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some platforms will force a double panic to abort the process. Some
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platforms use a C library which internally uses callbacks which cannot be
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unwound through, so panicking from <code>cb</code> may trigger a process abort.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">backtrace</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="ident">backtrace</span>::<span class="ident">trace</span>(<span class="op">|</span><span class="ident">frame</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="ident">ip</span> <span class="op">=</span> <span class="ident">frame</span>.<span class="ident">ip</span>();
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<span class="ident">backtrace</span>::<span class="ident">resolve</span>(<span class="ident">ip</span>, <span class="op">|</span><span class="ident">symbol</span><span class="op">|</span> {
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<span class="comment">// ...</span>
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});
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<span class="bool-val">false</span> <span class="comment">// only look at the top frame</span>
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});
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}</pre></div>
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