Evaluate functions in the debugger
lazarus / 12-Debugger

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paulvanderlinden · 2022-07-14 07:16

Hi all,

Is it possible to see the result of a function in the evaluate window
when debugging a program?
f.e. when stepping through
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i program
Project1;type   { TClass }   TClass=class    function Res:integer; 
end; { TClass } function TClass.Res:integer;begin  Result :=
42;end; var C:TClass;begin  C := TClass.Create;  C.Res;end. 
If I try to see the value of C.Res I get a
"Type TCLASS has no component named RES."
Is this dependent on debugger/os/?? or is this not possible in
general?

Paul

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Zvoni · 2022-07-14 07:28

Pretty much the same: https://forum.lazarus.freepascal.org/index.php/t
opic,59852.msg446723.html#msg446723

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paulvanderlinden · 2022-07-14 07:33

Thanks!
Not the answer I was hoping for, but at least it clarifies it

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Martin_fr · 2022-07-14 08:51

Yes, for some functions. (only retuning, int or ordinal value / not
returning string or managed types / strings work in trunk when using
dwarf-3)

Tools > Debugger > General: enable function calling
And enable for each watch individually in its properties.

Should work if the function body is in your code. And in case of
methods, in the same unit.

Quote from: paulvanderlinden on July 14, 2022, 09:16:19 amIf I try to
see the value of C.Res I get a
"Type TCLASS has no component named RES."
Is this dependent on debugger/os/?? or is this not possible in
general?

Only with FpDebug (tools > debugger > backend)

On Win 64/32 and Linux 64.  (And Linux 32 bit with Lazarus 2.3 main-
branch)