29.2 Registering Code
To register code with gdb, the JIT should follow this protocol:
- Generate an object file in memory with symbols and other desired debug information. The file must include the virtual addresses of the sections.
- Create a code entry for the file, which gives the start and size of the symbol file.
- Add it to the linked list in the JIT descriptor.
- Point the relevant_entry field of the descriptor at the entry.
When gdb is attached and the breakpoint fires, gdb uses the
relevant_entry pointer so it doesn't have to walk the list looking for
new code. However, the linked list must still be maintained in order to allow
gdb to attach to a running process and still find the symbol files.