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| <h3 class="section">29.4 Custom Debug Info</h3> |
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| <p>Generating debug information in platform-native file formats (like ELF |
| or COFF) may be an overkill for JIT compilers; especially if all the |
| debug info is used for is displaying a meaningful backtrace. The |
| issue can be resolved by having the JIT writers decide on a debug info |
| format and also provide a reader that parses the debug info generated |
| by the JIT compiler. This section gives a brief overview on writing |
| such a parser. More specific details can be found in the source file |
| <samp>gdb/jit-reader.in</samp>, which is also installed as a header at |
| <samp><var>includedir</var>/gdb/jit-reader.h</samp> for easy inclusion. |
| </p> |
| <p>The reader is implemented as a shared object (so this functionality is |
| not available on platforms which don’t allow loading shared objects at |
| runtime). Two <small>GDB</small> commands, <code>jit-reader-load</code> and |
| <code>jit-reader-unload</code> are provided, to be used to load and unload |
| the readers from a preconfigured directory. Once loaded, the shared |
| object is used the parse the debug information emitted by the JIT |
| compiler. |
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| <tr><td align="left" valign="top">• <a href="Using-JIT-Debug-Info-Readers.html#Using-JIT-Debug-Info-Readers" accesskey="1">Using JIT Debug Info Readers</a>:</td><td> </td><td align="left" valign="top">How to use supplied readers correctly |
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