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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 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, 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"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">idx</span>: <span class="ident">usize</span>,
<span class="ident">frames</span>: <span class="kw-2">&</span><span class="lifetime">'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">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> {
<span class="string">"unexpected return value while unwinding"</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">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> ::<span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></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">"{}: {:?}"</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">&</span><span class="kw-2">mut</span> [<span class="ident">Frame</span>])
<span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">BacktraceContext</span>)<span class="op">></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">&</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">=></span> {
<span class="prelude-val">Ok</span>((<span class="ident">cx</span>.<span class="ident">idx</span>, <span class="ident">BacktraceContext</span>))
}
_ <span class="op">=></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">-></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">&</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">&</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">&&</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="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 "call std::rt::begin_unwind", 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">"macos"</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">"ios"</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"><</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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