[rfa] Deprecate msymbol.info, add msymbol.bfd_symbol?

[Michael Elizabeth Chastain]

ac says:

	sym = lookup_minimal_symbol_by_pc (memaddr);
	if (sym && sym->bfd_symbol is "elf like")
	  return (ELF_ST_TYPE (((elf_symbol_type *) 
(sym->bfd_symbol))->internal_elf_sym.st_info) == STT_LOPROC)
	else
	  return 0;

Okay, I see.  The existing code has a hook in the symbol reader that
reads the bfd symbol and calls MSYMBOL_SET_SPECIAL to stash some bits in
msymbol.info for later.  You would get rid of the hook or simplify and
just store a simple pointer in msymbol.bfd_symbol.  Have I got that
right?

Sounds like a great idea to me.  A bunch of squirrelly caching and
casting code would go away.

               /* Pass symbol size field in via BFD.  FIXME!!!  */
               size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size;
               msym = record_minimal_symbol_and_info
                 ((char *) sym->name, symaddr,
                  ms_type, (void *) size, sym->section, objfile);

Yeah, for this code, you could either have msymbol.size or use the
information available from msymbol.bfd_symbol.  Anything but
mysmbol.info.

> This could immediatly eliminate two of them.  I think the coff version 
> of ARM could also be eliminated if coffread (yea, right ... :-) fully 
> utilized BFD.

I'm saying that this code is already dead:

                gdb_assert (sizeof (void *) >= sizeof (cs->c_sclass));
                msym = prim_record_minimal_symbol_and_info
                  (cs->c_name, tmpaddr, ms_type, (void *) (long) cs->c_sclass,
                   sec, NULL, objfile);

I'm not sure about these lines immediately after it:

               if (msym)
                  COFF_MAKE_MSYMBOL_SPECIAL (cs->c_sclass, msym);

I think you are saying that coffread.c can be made to work using
the new fields.  I don't know whether the existing code works or not,
I'm juse pointing to the deadness.

Michael C