[fpc-pascal] How to get a full backtrace in code?

[Mattias Gaertner]

On Thu, 10 Apr 2008 16:39:09 +0200
Graeme Geldenhuys <graemeg.lists at gmail.com> wrote:

> Hi,
> 
> I'm trying to create a default exception handler dialog for fpGUI. It 
> should display the error message and when the user clicks on the 
> 'Details' button, it should show the full backtrace. For some reason
> the backtrace I get is much smaller compared to the one if I don't
> handle exceptions at all (and the program crashes).
> 
> Currently I'm simply outputting to the console, until I get this
> right, which should then output to a Memo component. Here is my code
> to output a backtrace... called by my default exception handler
> (try...except block).
> 
> procedure DumpStack;
> begin
>    writeln(' Stack trace:');
>    Dump_Stack(StdOut, get_frame);
> end;
> 
> ... which gives the following output to the console.....
> 
> $ ./tutoradmin.exe
> exception at 0809DAAA:
> Unknown parameter HELLO.
>   Stack trace:
>    $080578F3  TFPGAPPLICATION__HANDLEEXCEPTION,  line 981 of 
> /home/graemeg/programming/fpGUI/src/corelib/fpgfx.pas
>    $08057A05  TFPGAPPLICATION__RUNMESSAGELOOP,  line 1010 of 
> /home/graemeg/programming/fpGUI/src/corelib/fpgfx.pas
>    $080570A1  TFPGAPPLICATION__RUN,  line 848 of 
> /home/graemeg/programming/fpGUI/src/corelib/fpgfx.pas
>    $080ED713  MAINPROC,  line 70 of tutoradmin.lpr
>    $080ED57D  main,  line 79 of tutoradmin.lpr
>    $080ED54D
> 
> 
> .... Now if I remove the try...except block and let FPC handle the 
> exception (and the program terminates), I get the following output to 
> the console. As you can see, it's a lot more detailed. How do I
> generate this myself, so I can display this in a Memo component.

Increase Max_Frame_Dump.


Mattias