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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="Source to the Rust file `libstd/sys/unix/backtrace/tracing/gcc_s.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>gcc_s.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../../../../light.css" id="themeStyle"><script src="../../../../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[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">&#9776;</div><a href='../../../../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></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"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><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"><pre class="line-numbers"><span id="1">  1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="kw">use</span> <span class="ident">error</span>::<span class="ident">Error</span>;
<span class="kw">use</span> <span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">libc</span>;
<span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">backtrace</span>::<span class="ident">BacktraceContext</span>;
<span class="kw">use</span> <span class="ident">sys_common</span>::<span class="ident">backtrace</span>::<span class="ident">Frame</span>;

<span class="kw">use</span> <span class="ident">unwind</span> <span class="kw">as</span> <span class="ident">uw</span>;

<span class="kw">struct</span> <span class="ident">Context</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="ident">idx</span>: <span class="ident">usize</span>,
    <span class="ident">frames</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> [<span class="ident">Frame</span>],
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">UnwindError</span>(<span class="ident">uw</span>::<span class="ident">_Unwind_Reason_Code</span>);

<span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">UnwindError</span> {
    <span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span> {
        <span class="string">&quot;unexpected return value while unwinding&quot;</span>
    }
}

<span class="kw">impl</span> ::<span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">UnwindError</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> ::<span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> ::<span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;{}: {:?}&quot;</span>, <span class="self">self</span>.<span class="ident">description</span>(), <span class="self">self</span>.<span class="number">0</span>)
    }
}

<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span> <span class="comment">// if we know this is a function call, we can skip it when</span>
                 <span class="comment">// tracing</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unwind_backtrace</span>(<span class="ident">frames</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">Frame</span>])
    <span class="op">-&gt;</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">BacktraceContext</span>)<span class="op">&gt;</span>
{
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cx</span> <span class="op">=</span> <span class="ident">Context</span> {
        <span class="ident">idx</span>: <span class="number">0</span>,
        <span class="ident">frames</span>,
    };
    <span class="kw">let</span> <span class="ident">result_unwind</span> <span class="op">=</span> <span class="kw">unsafe</span> {
        <span class="ident">uw</span>::<span class="ident">_Unwind_Backtrace</span>(<span class="ident">trace_fn</span>,
                              <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">cx</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Context</span>
                              <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span>)
    };
    <span class="comment">// See libunwind:src/unwind/Backtrace.c for the return values.</span>
    <span class="comment">// No, there is no doc.</span>
    <span class="kw">match</span> <span class="ident">result_unwind</span> {
        <span class="comment">// These return codes seem to be benign and need to be ignored for backtraces</span>
        <span class="comment">// to show up properly on all tested platforms.</span>
        <span class="ident">uw</span>::<span class="ident">_URC_END_OF_STACK</span> <span class="op">|</span> <span class="ident">uw</span>::<span class="ident">_URC_FATAL_PHASE1_ERROR</span> <span class="op">|</span> <span class="ident">uw</span>::<span class="ident">_URC_FAILURE</span> <span class="op">=&gt;</span> {
            <span class="prelude-val">Ok</span>((<span class="ident">cx</span>.<span class="ident">idx</span>, <span class="ident">BacktraceContext</span>))
        }
        <span class="kw">_</span> <span class="op">=&gt;</span> {
            <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>,
                               <span class="ident">UnwindError</span>(<span class="ident">result_unwind</span>)))
        }
    }
}

<span class="kw">extern</span> <span class="kw">fn</span> <span class="ident">trace_fn</span>(<span class="ident">ctx</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">uw</span>::<span class="ident">_Unwind_Context</span>,
                   <span class="ident">arg</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span>) <span class="op">-&gt;</span> <span class="ident">uw</span>::<span class="ident">_Unwind_Reason_Code</span> {
    <span class="kw">let</span> <span class="ident">cx</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="ident">arg</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Context</span>) };
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ip_before_insn</span> <span class="op">=</span> <span class="number">0</span>;
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ip</span> <span class="op">=</span> <span class="kw">unsafe</span> {
        <span class="ident">uw</span>::<span class="ident">_Unwind_GetIPInfo</span>(<span class="ident">ctx</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">ip_before_insn</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span>
    };
    <span class="kw">if</span> <span class="op">!</span><span class="ident">ip</span>.<span class="ident">is_null</span>() <span class="op">&amp;&amp;</span> <span class="ident">ip_before_insn</span> <span class="op">==</span> <span class="number">0</span> {
        <span class="comment">// this is a non-signaling frame, so `ip` refers to the address</span>
        <span class="comment">// after the calling instruction. account for that.</span>
        <span class="ident">ip</span> <span class="op">=</span> (<span class="ident">ip</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw">_</span>;
    }

    <span class="comment">// dladdr() on osx gets whiny when we use FindEnclosingFunction, and</span>
    <span class="comment">// it appears to work fine without it, so we only use</span>
    <span class="comment">// FindEnclosingFunction on non-osx platforms. In doing so, we get a</span>
    <span class="comment">// slightly more accurate stack trace in the process.</span>
    <span class="comment">//</span>
    <span class="comment">// This is often because panic involves the last instruction of a</span>
    <span class="comment">// function being &quot;call std::rt::begin_unwind&quot;, with no ret</span>
    <span class="comment">// instructions after it. This means that the return instruction</span>
    <span class="comment">// pointer points *outside* of the calling function, and by</span>
    <span class="comment">// unwinding it we go back to the original function.</span>
    <span class="kw">let</span> <span class="ident">symaddr</span> <span class="op">=</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;macos&quot;</span>) <span class="op">||</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;ios&quot;</span>) {
        <span class="ident">ip</span>
    } <span class="kw">else</span> {
        <span class="kw">unsafe</span> { <span class="ident">uw</span>::<span class="ident">_Unwind_FindEnclosingFunction</span>(<span class="ident">ip</span>) }
    };

    <span class="kw">if</span> <span class="ident">cx</span>.<span class="ident">idx</span> <span class="op">&lt;</span> <span class="ident">cx</span>.<span class="ident">frames</span>.<span class="ident">len</span>() {
        <span class="ident">cx</span>.<span class="ident">frames</span>[<span class="ident">cx</span>.<span class="ident">idx</span>] <span class="op">=</span> <span class="ident">Frame</span> {
            <span class="ident">symbol_addr</span>: <span class="ident">symaddr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>,
            <span class="ident">exact_position</span>: <span class="ident">ip</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>,
            <span class="ident">inline_context</span>: <span class="number">0</span>,
        };
        <span class="ident">cx</span>.<span class="ident">idx</span> <span class="op">+=</span> <span class="number">1</span>;
    }

    <span class="ident">uw</span>::<span class="ident">_URC_NO_REASON</span>
}
</pre>
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