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Re: [RFA]: breakpoint.c patch (prelude to pending breakpoint support)
- From: Daniel Jacobowitz <drow at mvista dot com>
- To: Eli Zaretskii <eliz at elta dot co dot il>
- Cc: Jeff Johnston <jjohnstn at redhat dot com>, gdb-patches at sources dot redhat dot com
- Date: Thu, 11 Dec 2003 09:21:19 -0500
- Subject: Re: [RFA]: breakpoint.c patch (prelude to pending breakpoint support)
- References: <3FD7C458.2080404@redhat.com> <u8yljvqnd.fsf@elta.co.il>
On Thu, Dec 11, 2003 at 08:01:58AM +0200, Eli Zaretskii wrote:
> The second comment is about this hunk of changes:
>
> > @@ -2574,9 +2581,7 @@ bpstat_stop_status (CORE_ADDR *pc, int n
> >
> > ALL_BREAKPOINTS_SAFE (b, temp)
> > {
> > - if (b->enable_state == bp_disabled
> > - || b->enable_state == bp_shlib_disabled
> > - || b->enable_state == bp_call_disabled)
> > + if (!breakpoint_enabled (b) && b->enable_state != bp_permanent)
> > continue;
>
> Bother. Is it really wise to replace an explicit check of equality to
> several bp_* constants with "!= bp_permanent"? Are we sure that any
> non-bp_permanent breakpoint should pass this test, even if in the
> future additional bp_* constants will be introduced that aren't there
> now?
I asked Jeff to do that, so I'll step in here :)
Right now, there are five possible enable states:
enabled
disabled
permanent
call_disabled
shlib_disabled
I'm not convinced that permanent should even be on the list. It's a
real oddball; and there's no reason that GDB couldn't virtually
"disable" a permanent breakpoint (step over it automatically when
hitting it; give it an always-false condition, in effect).
So the others boil down to a group of enabled breakpoint states and a
group of disabled breakpoint states. The body of the
bpstat_stop_status loop only cares about enabled breakpoints, and for
its purposes permanent breakpoints are enabled (because they might be
the reason that we stopped). So I think the new test is logically
correct.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer