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</pre><pre class="rust ">
<span class="doccomment">//! Demangle Rust compiler symbol names.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This crate provides a `demangle` function which will return a `Demangle`</span>
<span class="doccomment">//! sentinel value that can be used to learn about the demangled version of a</span>
<span class="doccomment">//! symbol name. The demangled representation will be the same as the original</span>
<span class="doccomment">//! if it doesn't look like a mangled symbol name.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! `Demangle` can be formatted with the `Display` trait. The alternate</span>
<span class="doccomment">//! modifier (`#`) can be used to format the symbol name without the</span>
<span class="doccomment">//! trailing hash value.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use rustc_demangle::demangle;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! assert_eq!(demangle("_ZN4testE").to_string(), "test");</span>
<span class="doccomment">//! assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");</span>
<span class="doccomment">//! assert_eq!(demangle("foo").to_string(), "foo");</span>
<span class="doccomment">//! // With hash</span>
<span class="doccomment">//! assert_eq!(format!("{}", demangle("_ZN3foo17h05af221e174051e9E")), "foo::h05af221e174051e9");</span>
<span class="doccomment">//! // Without hash</span>
<span class="doccomment">//! assert_eq!(format!("{:#}", demangle("_ZN3foo17h05af221e174051e9E")), "foo");</span>
<span class="doccomment">//! ```</span>
<span class="attribute">#![<span class="ident">no_std</span>]</span>
<span class="attribute">#![<span class="ident">deny</span>(<span class="ident">missing_docs</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>;
<span class="doccomment">/// Representation of a demangled symbol name.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Demangle</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">original</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>,
<span class="ident">inner</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>,
<span class="ident">valid</span>: <span class="ident">bool</span>,
<span class="doccomment">/// The number of ::-separated elements in the original name.</span>
<span class="ident">elements</span>: <span class="ident">usize</span>,
}
<span class="doccomment">/// De-mangles a Rust symbol into a more readable version</span>
<span class="doccomment">///</span>
<span class="doccomment">/// All rust symbols by default are mangled as they contain characters that</span>
<span class="doccomment">/// cannot be represented in all object files. The mangling mechanism is similar</span>
<span class="doccomment">/// to C++'s, but Rust has a few specifics to handle items like lifetimes in</span>
<span class="doccomment">/// symbols.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will take a **mangled** symbol (typically acquired from a</span>
<span class="doccomment">/// `Symbol` which is in turn resolved from a `Frame`) and then writes the</span>
<span class="doccomment">/// de-mangled version into the given `writer`. If the symbol does not look like</span>
<span class="doccomment">/// a mangled symbol, it is still written to `writer`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use rustc_demangle::demangle;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(demangle("_ZN4testE").to_string(), "test");</span>
<span class="doccomment">/// assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");</span>
<span class="doccomment">/// assert_eq!(demangle("foo").to_string(), "foo");</span>
<span class="doccomment">/// ```</span>
<span class="comment">// All rust symbols are in theory lists of "::"-separated identifiers. Some</span>
<span class="comment">// assemblers, however, can't handle these characters in symbol names. To get</span>
<span class="comment">// around this, we use C++-style mangling. The mangling method is:</span>
<span class="comment">//</span>
<span class="comment">// 1. Prefix the symbol with "_ZN"</span>
<span class="comment">// 2. For each element of the path, emit the length plus the element</span>
<span class="comment">// 3. End the path with "E"</span>
<span class="comment">//</span>
<span class="comment">// For example, "_ZN4testE" => "test" and "_ZN3foo3barE" => "foo::bar".</span>
<span class="comment">//</span>
<span class="comment">// We're the ones printing our backtraces, so we can't rely on anything else to</span>
<span class="comment">// demangle our symbols. It's *much* nicer to look at demangled symbols, so</span>
<span class="comment">// this function is implemented to give us nice pretty output.</span>
<span class="comment">//</span>
<span class="comment">// Note that this demangler isn't quite as fancy as it could be. We have lots</span>
<span class="comment">// of other information in our symbols like hashes, version, type information,</span>
<span class="comment">// etc. Additionally, this doesn't handle glue symbols at all.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">demangle</span>(<span class="kw-2">mut</span> <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">Demangle</span> {
<span class="comment">// During ThinLTO LLVM may import and rename internal symbols, so strip out</span>
<span class="comment">// those endings first as they're on of the last manglings applied to symbol</span>
<span class="comment">// names.</span>
<span class="kw">let</span> <span class="ident">llvm</span> <span class="op">=</span> <span class="string">".llvm."</span>;
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">find</span>(<span class="ident">llvm</span>) {
<span class="kw">let</span> <span class="ident">candidate</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="ident">i</span> <span class="op">+</span> <span class="ident">llvm</span>.<span class="ident">len</span>()..];
<span class="kw">let</span> <span class="ident">all_hex</span> <span class="op">=</span> <span class="ident">candidate</span>.<span class="ident">chars</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> {
<span class="kw">match</span> <span class="ident">c</span> {
<span class="string">'A'</span> ... <span class="string">'F'</span> <span class="op">|</span> <span class="string">'0'</span> ... <span class="string">'9'</span> <span class="op">|</span> <span class="string">'@'</span> <span class="op">=></span> <span class="bool-val">true</span>,
_ <span class="op">=></span> <span class="bool-val">false</span>,
}
});
<span class="kw">if</span> <span class="ident">all_hex</span> {
<span class="ident">s</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[..<span class="ident">i</span>];
}
}
<span class="comment">// First validate the symbol. If it doesn't look like anything we're</span>
<span class="comment">// expecting, we just print it literally. Note that we must handle non-rust</span>
<span class="comment">// symbols because we could have any function in the backtrace.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">valid</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">s</span>;
<span class="kw">if</span> <span class="ident">s</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">4</span> <span class="op">&&</span> <span class="ident">s</span>.<span class="ident">starts_with</span>(<span class="string">"_ZN"</span>) <span class="op">&&</span> <span class="ident">s</span>.<span class="ident">ends_with</span>(<span class="string">'E'</span>) {
<span class="ident">inner</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">3</span>..<span class="ident">s</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>];
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">3</span> <span class="op">&&</span> <span class="ident">s</span>.<span class="ident">starts_with</span>(<span class="string">"ZN"</span>) <span class="op">&&</span> <span class="ident">s</span>.<span class="ident">ends_with</span>(<span class="string">'E'</span>) {
<span class="comment">// On Windows, dbghelp strips leading underscores, so we accept "ZN...E"</span>
<span class="comment">// form too.</span>
<span class="ident">inner</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">2</span>..<span class="ident">s</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>];
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">5</span> <span class="op">&&</span> <span class="ident">s</span>.<span class="ident">starts_with</span>(<span class="string">"__ZN"</span>) <span class="op">&&</span> <span class="ident">s</span>.<span class="ident">ends_with</span>(<span class="string">'E'</span>) {
<span class="comment">// On OSX, symbols are prefixed with an extra _</span>
<span class="ident">inner</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">s</span>[<span class="number">4</span>..<span class="ident">s</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>];
} <span class="kw">else</span> {
<span class="ident">valid</span> <span class="op">=</span> <span class="bool-val">false</span>;
}
<span class="comment">// only work with ascii text</span>
<span class="kw">if</span> <span class="ident">inner</span>.<span class="ident">bytes</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">&</span> <span class="number">0x80</span> <span class="op">!=</span> <span class="number">0</span>) {
<span class="ident">valid</span> <span class="op">=</span> <span class="bool-val">false</span>;
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">elements</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">if</span> <span class="ident">valid</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span> <span class="op">=</span> <span class="ident">inner</span>.<span class="ident">chars</span>().<span class="ident">peekable</span>();
<span class="kw">while</span> <span class="ident">valid</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0usize</span>;
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">c</span>) <span class="op">=</span> <span class="ident">chars</span>.<span class="ident">peek</span>() {
<span class="kw">if</span> <span class="op">!</span><span class="ident">c</span>.<span class="ident">is_digit</span>(<span class="number">10</span>) {
<span class="kw">break</span>
}
<span class="ident">chars</span>.<span class="ident">next</span>();
<span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="ident">i</span>.<span class="ident">checked_mul</span>(<span class="number">10</span>)
.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span>.<span class="ident">checked_add</span>(<span class="ident">c</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="string">'0'</span> <span class="kw">as</span> <span class="ident">usize</span>));
<span class="ident">i</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">next</span> {
<span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=></span> <span class="ident">i</span>,
<span class="prelude-val">None</span> <span class="op">=></span> {
<span class="ident">valid</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>
}
};
}
<span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="number">0</span> {
<span class="ident">valid</span> <span class="op">=</span> <span class="ident">chars</span>.<span class="ident">next</span>().<span class="ident">is_none</span>();
<span class="kw">break</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">chars</span>.<span class="ident">by_ref</span>().<span class="ident">take</span>(<span class="ident">i</span>).<span class="ident">count</span>() <span class="op">!=</span> <span class="ident">i</span> {
<span class="ident">valid</span> <span class="op">=</span> <span class="bool-val">false</span>;
} <span class="kw">else</span> {
<span class="ident">elements</span> <span class="op">+=</span> <span class="number">1</span>;
}
}
}
<span class="ident">Demangle</span> {
<span class="ident">inner</span>: <span class="ident">inner</span>,
<span class="ident">valid</span>: <span class="ident">valid</span>,
<span class="ident">elements</span>: <span class="ident">elements</span>,
<span class="ident">original</span>: <span class="ident">s</span>,
}
}
<span class="doccomment">/// Error returned from the `try_demangle` function below when demangling fails.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">TryDemangleError</span> {
<span class="ident">_priv</span>: (),
}
<span class="doccomment">/// The same as `demangle`, except return an `Err` if the string does not appear</span>
<span class="doccomment">/// to be a Rust symbol, rather than "demangling" the given string as a no-op.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// extern crate rustc_demangle;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let not_a_rust_symbol = "la la la";</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The `try_demangle` function will reject strings which are not Rust symbols.</span>
<span class="doccomment">/// assert!(rustc_demangle::try_demangle(not_a_rust_symbol).is_err());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // While `demangle` will just pass the non-symbol through as a no-op.</span>
<span class="doccomment">/// assert_eq!(rustc_demangle::demangle(not_a_rust_symbol).as_str(), not_a_rust_symbol);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_demangle</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Demangle</span>, <span class="ident">TryDemangleError</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">sym</span> <span class="op">=</span> <span class="ident">demangle</span>(<span class="ident">s</span>);
<span class="kw">if</span> <span class="ident">sym</span>.<span class="ident">valid</span> {
<span class="prelude-val">Ok</span>(<span class="ident">sym</span>)
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">TryDemangleError</span> { <span class="ident">_priv</span>: () })
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Demangle</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// Returns the underlying string that's being demangled.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_str</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span> {
<span class="self">self</span>.<span class="ident">original</span>
}
}
<span class="comment">// Rust hashes are hex digits with an `h` prepended.</span>
<span class="kw">fn</span> <span class="ident">is_rust_hash</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">s</span>.<span class="ident">starts_with</span>(<span class="string">'h'</span>) <span class="op">&&</span> <span class="ident">s</span>[<span class="number">1</span>..].<span class="ident">chars</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">is_digit</span>(<span class="number">16</span>))
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Demangle</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></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="comment">// Alright, let's do this.</span>
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">valid</span> {
<span class="kw">return</span> <span class="ident">f</span>.<span class="ident">write_str</span>(<span class="self">self</span>.<span class="ident">inner</span>);
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">inner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>;
<span class="kw">for</span> <span class="ident">element</span> <span class="kw">in</span> <span class="number">0</span>..<span class="self">self</span>.<span class="ident">elements</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rest</span> <span class="op">=</span> <span class="ident">inner</span>;
<span class="kw">while</span> <span class="ident">rest</span>.<span class="ident">chars</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">is_digit</span>(<span class="number">10</span>) {
<span class="ident">rest</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">rest</span>[<span class="number">1</span>..];
}
<span class="kw">let</span> <span class="ident">i</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">inner</span>[..(<span class="ident">inner</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">rest</span>.<span class="ident">len</span>())].<span class="ident">parse</span>().<span class="ident">unwrap</span>();
<span class="ident">inner</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">rest</span>[<span class="ident">i</span>..];
<span class="ident">rest</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">rest</span>[..<span class="ident">i</span>];
<span class="comment">// Skip printing the hash if alternate formatting</span>
<span class="comment">// was requested.</span>
<span class="kw">if</span> <span class="ident">f</span>.<span class="ident">alternate</span>() <span class="op">&&</span> <span class="ident">element</span><span class="op">+</span><span class="number">1</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">elements</span> <span class="op">&&</span> <span class="ident">is_rust_hash</span>(<span class="kw-2">&</span><span class="ident">rest</span>) {
<span class="kw">break</span>;
}
<span class="kw">if</span> <span class="ident">element</span> <span class="op">!=</span> <span class="number">0</span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">"::"</span>));
}
<span class="kw">if</span> <span class="ident">rest</span>.<span class="ident">starts_with</span>(<span class="string">"_$"</span>) {
<span class="ident">rest</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">rest</span>[<span class="number">1</span>..];
}
<span class="kw">while</span> <span class="op">!</span><span class="ident">rest</span>.<span class="ident">is_empty</span>() {
<span class="kw">if</span> <span class="ident">rest</span>.<span class="ident">starts_with</span>(<span class="string">'.'</span>) {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="string">'.'</span>) <span class="op">=</span> <span class="ident">rest</span>[<span class="number">1</span>..].<span class="ident">chars</span>().<span class="ident">next</span>() {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">"::"</span>));
<span class="ident">rest</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">rest</span>[<span class="number">2</span>..];
} <span class="kw">else</span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">"."</span>));
<span class="ident">rest</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">rest</span>[<span class="number">1</span>..];
}
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">rest</span>.<span class="ident">starts_with</span>(<span class="string">'$'</span>) {
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">demangle</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pat</span>:<span class="ident">expr</span> <span class="op">=></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">demangled</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=></span> ({
$(<span class="kw">if</span> <span class="ident">rest</span>.<span class="ident">starts_with</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pat</span>) {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">demangled</span>));
<span class="ident">rest</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">rest</span>[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pat</span>.<span class="ident">len</span>()..];
} <span class="kw">else</span>)<span class="op">*</span>
{
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="ident">rest</span>));
<span class="kw">break</span>;
}
})
}
<span class="comment">// see src/librustc/back/link.rs for these mappings</span>
<span class="macro">demangle</span><span class="macro">!</span> {
<span class="string">"$SP$"</span> <span class="op">=></span> <span class="string">"@"</span>,
<span class="string">"$BP$"</span> <span class="op">=></span> <span class="string">"*"</span>,
<span class="string">"$RF$"</span> <span class="op">=></span> <span class="string">"&"</span>,
<span class="string">"$LT$"</span> <span class="op">=></span> <span class="string">"<"</span>,
<span class="string">"$GT$"</span> <span class="op">=></span> <span class="string">">"</span>,
<span class="string">"$LP$"</span> <span class="op">=></span> <span class="string">"("</span>,
<span class="string">"$RP$"</span> <span class="op">=></span> <span class="string">")"</span>,
<span class="string">"$C$"</span> <span class="op">=></span> <span class="string">","</span>,
<span class="comment">// in theory we can demangle any Unicode code point, but</span>
<span class="comment">// for simplicity we just catch the common ones.</span>
<span class="string">"$u7e$"</span> <span class="op">=></span> <span class="string">"~"</span>,
<span class="string">"$u20$"</span> <span class="op">=></span> <span class="string">" "</span>,
<span class="string">"$u27$"</span> <span class="op">=></span> <span class="string">"'"</span>,
<span class="string">"$u5b$"</span> <span class="op">=></span> <span class="string">"["</span>,
<span class="string">"$u5d$"</span> <span class="op">=></span> <span class="string">"]"</span>,
<span class="string">"$u7b$"</span> <span class="op">=></span> <span class="string">"{"</span>,
<span class="string">"$u7d$"</span> <span class="op">=></span> <span class="string">"}"</span>,
<span class="string">"$u3b$"</span> <span class="op">=></span> <span class="string">";"</span>,
<span class="string">"$u2b$"</span> <span class="op">=></span> <span class="string">"+"</span>,
<span class="string">"$u22$"</span> <span class="op">=></span> <span class="string">"\""</span>
}
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">rest</span>.<span class="ident">char_indices</span>().<span class="ident">find</span>(<span class="op">|</span><span class="kw-2">&</span>(_, <span class="ident">c</span>)<span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'$'</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'.'</span>) {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="ident">rest</span>.<span class="ident">len</span>(),
<span class="prelude-val">Some</span>((<span class="ident">i</span>, _)) <span class="op">=></span> <span class="ident">i</span>,
};
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="kw-2">&</span><span class="ident">rest</span>[..<span class="ident">idx</span>]));
<span class="ident">rest</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">rest</span>[<span class="ident">idx</span>..];
}
}
}
<span class="prelude-val">Ok</span>(())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Demangle</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></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="ident">fmt</span>::<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</span>)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">prelude</span>::<span class="ident">v1</span>::<span class="kw-2">*</span>;
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">t</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">expr</span>) <span class="op">=></span> ({
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw">super</span>::<span class="ident">demangle</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>).<span class="ident">to_string</span>(), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>);
})
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">t_nohash</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>:<span class="ident">expr</span>) <span class="op">=></span> ({
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"{:#}"</span>, <span class="kw">super</span>::<span class="ident">demangle</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>)), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">b</span>);
})
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle</span>() {
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"test"</span>, <span class="string">"test"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN4testE"</span>, <span class="string">"test"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN4test"</span>, <span class="string">"_ZN4test"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN4test1a2bcE"</span>, <span class="string">"test::a::bc"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle_dollars</span>() {
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN4$RP$E"</span>, <span class="string">")"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN8$RF$testE"</span>, <span class="string">"&test"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN8$BP$test4foobE"</span>, <span class="string">"*test::foob"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN9$u20$test4foobE"</span>, <span class="string">" test::foob"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN35Bar$LT$$u5b$u32$u3b$$u20$4$u5d$$GT$E"</span>, <span class="string">"Bar<[u32; 4]>"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle_many_dollars</span>() {
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN13test$u20$test4foobE"</span>, <span class="string">"test test::foob"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN12test$BP$test4foobE"</span>, <span class="string">"test*test::foob"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle_osx</span>() {
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"__ZN5alloc9allocator6Layout9for_value17h02a996811f781011E"</span>, <span class="string">"alloc::allocator::Layout::for_value::h02a996811f781011"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"__ZN38_$LT$core..option..Option$LT$T$GT$$GT$6unwrap18_MSG_FILE_LINE_COL17haf7cb8d5824ee659E"</span>, <span class="string">"<core::option::Option<T>>::unwrap::_MSG_FILE_LINE_COL::haf7cb8d5824ee659"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"__ZN4core5slice89_$LT$impl$u20$core..iter..traits..IntoIterator$u20$for$u20$$RF$$u27$a$u20$$u5b$T$u5d$$GT$9into_iter17h450e234d27262170E"</span>, <span class="string">"core::slice::<impl core::iter::traits::IntoIterator for &'a [T]>::into_iter::h450e234d27262170"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle_windows</span>() {
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"ZN4testE"</span>, <span class="string">"test"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"ZN13test$u20$test4foobE"</span>, <span class="string">"test test::foob"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"ZN12test$RF$test4foobE"</span>, <span class="string">"test&test::foob"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle_elements_beginning_with_underscore</span>() {
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN13_$LT$test$GT$E"</span>, <span class="string">"<test>"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN28_$u7b$$u7b$closure$u7d$$u7d$E"</span>, <span class="string">"{{closure}}"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN15__STATIC_FMTSTRE"</span>, <span class="string">"__STATIC_FMTSTR"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle_trait_impls</span>() {
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN71_$LT$Test$u20$$u2b$$u20$$u27$static$u20$as$u20$foo..Bar$LT$Test$GT$$GT$3barE"</span>,
<span class="string">"<Test + 'static as foo::Bar<Test>>::bar"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle_without_hash</span>() {
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"_ZN3foo17h05af221e174051e9E"</span>;
<span class="macro">t</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">"foo::h05af221e174051e9"</span>);
<span class="macro">t_nohash</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">"foo"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle_without_hash_edgecases</span>() {
<span class="comment">// One element, no hash.</span>
<span class="macro">t_nohash</span><span class="macro">!</span>(<span class="string">"_ZN3fooE"</span>, <span class="string">"foo"</span>);
<span class="comment">// Two elements, no hash.</span>
<span class="macro">t_nohash</span><span class="macro">!</span>(<span class="string">"_ZN3foo3barE"</span>, <span class="string">"foo::bar"</span>);
<span class="comment">// Longer-than-normal hash.</span>
<span class="macro">t_nohash</span><span class="macro">!</span>(<span class="string">"_ZN3foo20h05af221e174051e9abcE"</span>, <span class="string">"foo"</span>);
<span class="comment">// Shorter-than-normal hash.</span>
<span class="macro">t_nohash</span><span class="macro">!</span>(<span class="string">"_ZN3foo5h05afE"</span>, <span class="string">"foo"</span>);
<span class="comment">// Valid hash, but not at the end.</span>
<span class="macro">t_nohash</span><span class="macro">!</span>(<span class="string">"_ZN17h05af221e174051e93fooE"</span>, <span class="string">"h05af221e174051e9::foo"</span>);
<span class="comment">// Not a valid hash, missing the 'h'.</span>
<span class="macro">t_nohash</span><span class="macro">!</span>(<span class="string">"_ZN3foo16ffaf221e174051e9E"</span>, <span class="string">"foo::ffaf221e174051e9"</span>);
<span class="comment">// Not a valid hash, has a non-hex-digit.</span>
<span class="macro">t_nohash</span><span class="macro">!</span>(<span class="string">"_ZN3foo17hg5af221e174051e9E"</span>, <span class="string">"foo::hg5af221e174051e9"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">demangle_thinlto</span>() {
<span class="comment">// One element, no hash.</span>
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN3fooE.llvm.9D1C9369"</span>, <span class="string">"foo"</span>);
<span class="macro">t</span><span class="macro">!</span>(<span class="string">"_ZN3fooE.llvm.9D1C9369@@16"</span>, <span class="string">"foo"</span>);
<span class="macro">t_nohash</span><span class="macro">!</span>(<span class="string">"_ZN9backtrace3foo17hbb467fcdaea5d79bE.llvm.A5310EB9"</span>, <span class="string">"backtrace::foo"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">dont_panic</span>() {
<span class="kw">super</span>::<span class="ident">demangle</span>(<span class="string">"_ZN2222222222222222222222EE"</span>).<span class="ident">to_string</span>();
<span class="kw">super</span>::<span class="ident">demangle</span>(<span class="string">"_ZN5*70527e27.ll34csaғE"</span>).<span class="ident">to_string</span>();
<span class="kw">super</span>::<span class="ident">demangle</span>(<span class="string">"_ZN5*70527a54.ll34_$b.1E"</span>).<span class="ident">to_string</span>();
<span class="kw">super</span>::<span class="ident">demangle</span>(<span class="string">"\
_ZN5~saäb4e\n\
2734cOsbE\n\
5usage20h)3\0\0\0\0\0\0\07e2734cOsbE\
"</span>).<span class="ident">to_string</span>();
}
}
</pre>
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