DebugBreak() in Ada

DebugBreak() in Ada

[Petter]

I used some way to cause a DebugBreak() (programmatically causeng a break command in gdb) some 10 years ago. Now I can't find it. Perhaps one could raise int3? But I can't find how to either.
Regards,
Petter

Re: DebugBreak() in Ada

[Niklas Holsti]

On 2023-04-25 14:18, Petter wrote:
> I used some way to cause a DebugBreak() (programmatically causeng a
> break command in gdb) some 10 years ago. Now I can't find it. Perhaps
> one could raise int3? But I can't find how to either. Regards, 
> Petter


What do you mean by "causing a break command in gdb"? Do you intend to 
run the program under gdb, and want to be able to insert something -- 
perhaps a call DebugBreak -- in the Ada source to always cause a break 
into gdb control at the point of that call, without having to set gdb 
breakpoints at every call?

It is not a fully automatic method, but you could write a null Ada 
procedure DebugBreak and set a breakpoint in that procedure, manually 
from gdb, before starting the program. Then every call to DebugBreak 
will break, and you can look one level down in the call chain to see the 
state at the point of call.

Re: DebugBreak() in Ada

[Petter]

tisdag 25 april 2023 kl. 14:12:02 UTC+2 skrev Niklas Holsti:
> On 2023-04-25 14:18, Petter wrote: 
> > I used some way to cause a DebugBreak() (programmatically causeng a 
> > break command in gdb) some 10 years ago. Now I can't find it. Perhaps 
> > one could raise int3? But I can't find how to either. Regards, 
> > Petter
> What do you mean by "causing a break command in gdb"? Do you intend to 
> run the program under gdb, and want to be able to insert something -- 
> perhaps a call DebugBreak -- in the Ada source to always cause a break 
> into gdb control at the point of that call, without having to set gdb 
> breakpoints at every call? 
> 
> It is not a fully automatic method, but you could write a null Ada 
> procedure DebugBreak and set a breakpoint in that procedure, manually 
> from gdb, before starting the program. Then every call to DebugBreak 
> will break, and you can look one level down in the call chain to see the 
> state at the point of call.

Sorry, I thougth DebugBreak() was familiar. If you in other languages not used by me call DebugBreak() i cuases the debugger to stop a running execution. I'm thought we had a similar for Ada. But I can be mistaken

Re: DebugBreak() in Ada

[Simon Wright]

Niklas Holsti <niklas.holsti@tidorum.invalid> writes:

> It is not a fully automatic method, but you could write a null Ada
> procedure DebugBreak and set a breakpoint in that procedure, manually
> from gdb, before starting the program. Then every call to DebugBreak
> will break, and you can look one level down in the call chain to see
> the state at the point of call.

Great idea!

Re: DebugBreak() in Ada

[Simon Wright]

Petter <petter_fryklund@hotmail.com> writes:

> I used some way to cause a DebugBreak() (programmatically causeng a
> break command in gdb) some 10 years ago. Now I can't find it. Perhaps
> one could raise int3? But I can't find how to either.

I just googled debugbreak and the third hit was this:
  https://github.com/scottt/debugbreak

It'd need some work, but at least on macOS/x86_64 GCC & clang[++] both
give a SIGTRAP.