Hi,
I'm trying to set a condition on a breakpoint.
I have a local variable aUnit, type string:
var
aUnit : string;
I wish the breakpoint is only triggered when aUnit equals 'termio'.
So, in the breakpoint properties dialog, I enter the condition:
aUnit='termio'
It seems to have no effect whatsoever. The breakpoint is triggered always at
the first traversal of the line.
I tried variations (uppercase, lowercase) , but to no avail.
Looking at the debug internals window, I see that the expression is
only (correctly) evaluated by gdb when I move the mouse over the identifier
in the sources:
(gdb)
<ptype AUNIT>
&"ptype AUNIT\n"
~"type = ^Char\n"
^done
(gdb)
<ptype AUNIT^>
&"ptype AUNIT^\n"
~"type = Char\n"
^done
(gdb)
<whatis AUNIT>
&"whatis AUNIT\n"
~"type = ANSISTRING\n"
^done
(gdb)
<-data-evaluate-expression AUNIT>
^done,value="0x7ffff7f73b18 'si_prc'"
(gdb)
So it can correctly evaluate the value aUnit.
The question is, why is it ignoring my condition ?
After some digging in the gdb output I find this:
&"Error in testing breakpoint condition:\n"
&"evaluation of this expression requires the program to have a function
\"malloc\".\n"
Hm. No mention of this in:
https://wiki.lazarus.freepascal.org/Debugger_Setup
https://wiki.lazarus.freepascal.org/IDE_Window:_Breakpoints#Breakpoint_properties
OK, File under 'undocumented' and ignore for the time being, but I add cmem unit
to my program.
Seemingly, gdb now accepts the breakpoint condition:
<-break-insert "\"/home/michael/domakefile.lpr\":161">
^done,bkpt={number="7",type="breakpoint",disp="keep",enabled="y",addr="0x0000000000401fe7",func="ADDRECIPE",file="domakefile.lpr",fullname="/home/michael/domakefile.lpr",line="161",thread-groups=["i1"],times="0",original-location="/home/michael/domakefile.lpr:161"}
(gdb)
<-break-condition 7 AUNIT="termio">
^done
(gdb)
<-break-enable 7>
^done
That makes it even worse: the breakpoint is simply never observed.
If I do a poor man's conditional breakpoint:
if (aUnit='termio') then
Writeln('Aloha'); <-- set breakpoint on this line
and run, I see that unit 'termio' is definitely encountered.
So, "Houston, we have a problem..."
Suggestions, things I maybe forgot ?
Michael.
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