Re: RFA: Breakpoint infrastructure cleanups [0/8]

[Daniel Jacobowitz <drow@mvista.com>]

On Wed, Oct 08, 2003 at 05:06:35PM -0400, Elena Zannoni wrote:
> Daniel Jacobowitz writes:
>  > > I think 'info break' should list the addresses.  I don't know how this
>  > > should fit into the MI format, but it ought to be MI that changes,
>  > > rather than omitting useful behavior.
>  > > 
>  > > In my ideal world, you'd get an explanation for why each address was
>  > > chosen, when it's not obvious:
>  > > 
>  > > (gdb) info break
>  > > Num Type           Disp Enb Address    What
>  > > 1   breakpoint     keep y   0x08048354 in foo::foo (in-charge) at hello.c:8
>  > >                             0x08048364 in foo::foo (not-in-charge) at hello.c:8
>  > > (gdb) 
>  > 
>  > Here's the problem that I see.
>  > 
>  > For foo::foo, there are two of these things.  Having them both in the
>  > list would be nice.  Really nice.
>  > 
>  > For inline_accessor_fn there are 3.8 million.  In addition to needing
>  > to do a whole lot of work on GDB internals before we could survive this
>  > (memory usage; ptrace thrashing inserting and removing them; linked
>  > lists of breakpoints; and that's just the beginning) this has some
>  > severe user interface implications.  We don't want to print out all
>  > those addresses by default!
>  > 
>  > I'm open to suggestions on how to deal with this.
>  > 
> 
> There is already 'maint info break', how about extending that?  Would
> you be able to distinguish between foo::foo breakpoints and inline
> breakpoints so that they can be displayed on separate lists/commands?

Hmm... sure, I suppose so.  I haven't thought about how well it scales
and I don't think I can until I have some implementation in front of me
to play with.  Something like this?

1   breakpoint     keep y   0x08048354 in foo::foo() (in-charge) at hello.c:8
                            0x08048364 in foo::foo() (not-in-charge) at hello.c:8

2   breakpoint     keep y   <multiple> in foo::baz at hello.c:12

3   breakpoint     keep y   <multiple> in foo::foo(int) (in-charge) at hello.c:10
                            <multiple> in foo::foo(int) (not-in-charge) at hello.c:10

Where the latter two describe inlined copies.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer