[fpc-pascal] Debug information

[Rainer Stratmann]

Am Tuesday 11 September 2012 19:30:55 schrieb Mark Morgan Lloyd:
> Rainer Stratmann wrote:
> > Am Tuesday 11 September 2012 18:14:57 schrieb Mark Morgan Lloyd:
> >> Martin wrote:
> >>> On 11/09/2012 10:28, Rainer Stratmann wrote:
> >>>> I found out that there is no line information shown (-gl) if an error
> >>>> occurs
> >>>> (more or less shortly) after the program loads a dynamic library.
> >>>>
> >>>> This same behaviour happens with fpc version 2.4.2-0 and 2.6.0.
> >>>>
> >>>> If no library is loaded line information is shown.
> >>>> The error adresses are the same in both cases.
> >>
> >> How is the library being loaded: using FPC's dynlibs unit?
> >
> > Yes.
> >
> >> If using dynlibs, is the problem immediately after loading the library
> >> (.so) or is it on a call of an entry point in the library?
> >
> > Immediately after loading the library.
>
> In which case I presume that you could comment out the calls to the
> entry points in the library and duplicate the problem (have you tried
> this?). Does the recently-added GetLoadError() function tell you
> anything useful?

The error is produced immediately after loading (not executing) the library 
(writing to a random memory adress).

I did not find information of the GetLoadError() function.

> >> Is the DLL successfully called, does it exit predictably, and does the
> >> stack recover to the state it was on entry (i.e. without an extra or
> >> missing word)?
> >
> > The program restarts some times and there is no error.
>
> If it's specifically something that happens at load time then below
> probably isn't relevant.

> > Stack recovery I don't know. I think it will be ok. How can I see that?
>
> Inline assembler to dump esp and ebp.

?

> > I use loadlibrary and freelibrary.
> > There are only 3 functions/procedures calling from the program.
> > (init_proc, loop_proc, exit_proc).
> > The library calls back a procedure (add a key to a keybuffer) but in this
> > procedure there is no error.
> > I tried safeloadlibrary but the same thing.