75 lines
3.6 KiB
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75 lines
3.6 KiB
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<title>Custom Debug Info - Debugging with GDB</title>
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<div class="node">
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<a name="Custom-Debug-Info"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Unregistering-Code.html#Unregistering-Code">Unregistering Code</a>,
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Up: <a rel="up" accesskey="u" href="JIT-Interface.html#JIT-Interface">JIT Interface</a>
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<hr>
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</div>
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<h3 class="section">29.4 Custom Debug Info</h3>
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<p><a name="index-custom-JIT-debug-info-3152"></a><a name="index-JIT-debug-info-reader-3153"></a>
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Generating debug information in platform-native file formats (like ELF
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or COFF) may be an overkill for JIT compilers; especially if all the
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debug info is used for is displaying a meaningful backtrace. The
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issue can be resolved by having the JIT writers decide on a debug info
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format and also provide a reader that parses the debug info generated
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by the JIT compiler. This section gives a brief overview on writing
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such a parser. More specific details can be found in the source file
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<samp><span class="file">gdb/jit-reader.in</span></samp>, which is also installed as a header at
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<samp><var>includedir</var><span class="file">/gdb/jit-reader.h</span></samp> for easy inclusion.
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<p>The reader is implemented as a shared object (so this functionality is
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not available on platforms which don't allow loading shared objects at
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runtime). Two <span class="sc">gdb</span> commands, <code>jit-reader-load</code> and
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<code>jit-reader-unload</code> are provided, to be used to load and unload
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the readers from a preconfigured directory. Once loaded, the shared
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object is used the parse the debug information emitted by the JIT
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compiler.
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<ul class="menu">
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<li><a accesskey="1" href="Using-JIT-Debug-Info-Readers.html#Using-JIT-Debug-Info-Readers">Using JIT Debug Info Readers</a>: How to use supplied readers correctly
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<li><a accesskey="2" href="Writing-JIT-Debug-Info-Readers.html#Writing-JIT-Debug-Info-Readers">Writing JIT Debug Info Readers</a>: Creating a debug-info reader
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</ul>
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</body></html>
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