Re: egcs debugging (on alpha)

[Jason Duerstock <jason at sdi dot cluephone dot com>]

On Tue, 9 Feb 1999, Jeffrey A Law wrote:

> Probably the next thing is to find out what the allocators *thought* they
> did :-)
> 
> I would put a breakpoint in "reload", then p reg_renumber[597] at the start
> of reload.  Then "finish" and print it again.
> 
> The point is to find out if it had a register before or after reload.

Okay, I put in the first breakpoint

(gdb) p reg_renumber[597]
$4 = -1
(gdb) finish
[segmentation fault]

> You might also want to put a conditional breakpoint in emit_reload_insns
> Something like
> 
> b emit_reload_insns if chain->insn->fld[0].rtint == 11940
> 
> Would be the magic for the current sources.
> 
> For the egcs-1.1.x releases use this instead:
> 
> b emit_reload_insns if insn->fld[0].rtint == 11940
> 
> When you stop do
> 
> p debug_reload()
> p debug_rtx(reg_equiv_mem[597])
> p debug_rtx(reg_equiv_address[597])

I tried to set the breakpoint but it kept complaining 'error in testing
breakpoint condition: cannot access memory at address 0x9'

> Are you having fun yet?

Actually this is lots of fun.  I feel like I'm making some real progress.
:)

Jason