Re: [RFA] Debug info detection.

[Andrew Cagney <ac131313@redhat.com>]

> For now I have...
> 
> const struct frame_unwind *
> x86_64_frame_p (CORE_ADDR pc)
> {
>   struct frame_unwind *unwind_cfi = NULL;
>   struct frame_unwind *unwind_asm = &x86_64_asm_frame_unwind;
>   struct frame_unwind *unwind_sigtramp = &x86_64_sigtramp_frame_unwind;
>   char *name;
> 
>   find_pc_partial_function (pc, &name, NULL, NULL);
>   if (gdbarch_pc_in_sigtramp (current_gdbarch, pc, name))
>     return unwind_sigtramp;
>   else if (cfi_have_unwind_info (pc))
>     return unwind_cfi;   /* Returns NULL here...  */
>   else
>     return unwind_asm;
> }

The function x86-64-tdep.c:x86_64_frame_p() should contain:
	return x86_64_unwind;

The file/function dwarf2cfi-frame.c:dwarf2cfi_frame_p() should contain:
	if (cfi_have_unwind_info (pc))
	     return dwarf2cfi_unwind;

(Assuming sigtramps are os specific) The file/function 
x86-64-linux-tdep.c:x86_64_linux_sigtramp_frame_p() should contain:
 >   if (gdbarch_pc_in_sigtramp (current_gdbarch, pc, name))
 >     return x86_64_linux_sigtramp_unwind;

Andrew