gdb: Custom Debug Info
29.4 Custom Debug Info
======================
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
'gdb/jit-reader.in', which is also installed as a header at
'INCLUDEDIR/gdb/jit-reader.h' for easy inclusion.
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 GDB commands, 'jit-reader-load' and
'jit-reader-unload' 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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