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| -<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 39. Demangling</title><meta name="generator" content="DocBook XSL Stylesheets V1.74.0" /><meta name="keywords" content=" ISO C++ , library " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="extensions.html" title="Part XII. Extensions" /><link rel="prev" href="ext_io.html" title="Chapter 38. Input and Output" /><link rel="next" href="ext_concurrency.html" title="Chapter 40. Concurrency" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 39. Demangling</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ext_io.html">Prev</a> </td><th width="60%" align="center">Part XII.
|
| - Extensions
|
| -
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| -</th><td width="20%" align="right"> <a accesskey="n" href="ext_concurrency.html">Next</a></td></tr></table><hr /></div><div class="chapter" lang="en" xml:lang="en"><div class="titlepage"><div><div><h2 class="title"><a id="manual.ext.demangle"></a>Chapter 39. Demangling</h2></div></div></div><p>
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| - Transforming C++ ABI identifiers (like RTTI symbols) into the
|
| - original C++ source identifiers is called
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| - “<span class="quote">demangling.</span>”
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| - </p><p>
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| - If you have read the <a class="ulink" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespaceabi.html" target="_top">source
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| - documentation for <code class="code">namespace abi</code></a> then you are
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| - aware of the cross-vendor C++ ABI in use by GCC. One of the
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| - exposed functions is used for demangling,
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| - <code class="code">abi::__cxa_demangle</code>.
|
| - </p><p>
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| - In programs like <span class="command"><strong>c++filt</strong></span>, the linker, and other tools
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| - have the ability to decode C++ ABI names, and now so can you.
|
| - </p><p>
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| - (The function itself might use different demanglers, but that's the
|
| - whole point of abstract interfaces. If we change the implementation,
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| - you won't notice.)
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| - </p><p>
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| - Probably the only times you'll be interested in demangling at runtime
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| - are when you're seeing <code class="code">typeid</code> strings in RTTI, or when
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| - you're handling the runtime-support exception classes. For example:
|
| - </p><pre class="programlisting">
|
| -#include <exception>
|
| -#include <iostream>
|
| -#include <cxxabi.h>
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| -
|
| -struct empty { };
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| -
|
| -template <typename T, int N>
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| - struct bar { };
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| -
|
| -
|
| -int main()
|
| -{
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| - int status;
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| - char *realname;
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| -
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| - // exception classes not in <stdexcept>, thrown by the implementation
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| - // instead of the user
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| - std::bad_exception e;
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| - realname = abi::__cxa_demangle(e.what(), 0, 0, &status);
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| - std::cout << e.what() << "\t=> " << realname << "\t: " << status << '\n';
|
| - free(realname);
|
| -
|
| -
|
| - // typeid
|
| - bar<empty,17> u;
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| - const std::type_info &ti = typeid(u);
|
| -
|
| - realname = abi::__cxa_demangle(ti.name(), 0, 0, &status);
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| - std::cout << ti.name() << "\t=> " << realname << "\t: " << status << '\n';
|
| - free(realname);
|
| -
|
| - return 0;
|
| -}
|
| - </pre><p>
|
| - This prints
|
| - </p><pre class="screen">
|
| - <code class="computeroutput">
|
| - St13bad_exception => std::bad_exception : 0
|
| - 3barI5emptyLi17EE => bar<empty, 17> : 0
|
| - </code>
|
| - </pre><p>
|
| - The demangler interface is described in the source documentation
|
| - linked to above. It is actually written in C, so you don't need to
|
| - be writing C++ in order to demangle C++. (That also means we have to
|
| - use crummy memory management facilities, so don't forget to free()
|
| - the returned char array.)
|
| - </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ext_io.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="extensions.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ext_concurrency.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 38. Input and Output </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 40. Concurrency</td></tr></table></div></body></html>
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|
|
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