[Bug gdb/30581] New: Improving the JIT Interface

[Bug gdb/30581] New: Improving the JIT Interface

[admin at typoflash dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30581

            Bug ID: 30581
           Summary: Improving the JIT Interface
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: admin at typoflash dot com
  Target Milestone: ---

From my understanding of the code, to load ELF debug symbols with the JIT
interface, the DWARF pc values must point to absolute addresses. Thus it is not
possible to e.g. use the interface with compiler-generated shared ELF
libraries.

This is due to:

1. "jit_bfd_try_read_symtab" stores the sections sec->sh_addr into sai.
2. "addr_info_make_relative" substracts the sec->sh_addr from the sai address,
making the sai addresses zero.
3. "relative_addr_info_to_section_offsets" sets the section_offsets to the zero
sai addresses.
4. "read_func_scope" takes a zero base address from section_offsets when
resolving a symbol address.

I assume the JIT ELF files are supposed to be created with absolute DWARF pc
values and the text sec->sh_addr values don't matter?

This incompatibility between regular and generated ELF files for the JIT
interface seems odd.

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