[Gambas-user] Debugging Gambas (again)

[KKing]

again, thankyou all. just for ref here is the backtrace from current dev 
system if it has any value, remember it is from 3.8.4

<<
(gdb) bt
#0  0x0806d8d3 in STRING_new (src=0x0, len=2) at gbx_string.c:311
#1  0x0806dc06 in STRING_new_temp_value (value=0xb7447a80, src=0x0, 
len=2) at gbx_string.c:459
#2  0x0806d058 in NUMBER_int_to_string (nbr=0, prec=0, base=10, 
value=0xb7447a80) at gbx_number.c:491
#3  0x0804dc92 in VALUE_convert (value=0xb7447a80, type=9) at 
gbx_value.c:576
#4  0x08061272 in SUBR_conv (code=26377) at gbx_subr_conv.c:108
#5  0x0807f282 in EXEC_loop () at gbx_exec_loop.c:510
#6  0x080510e2 in EXEC_function_loop () at gbx_exec.c:931
#7  0x08051765 in EXEC_function_real () at gbx_exec.c:895
#8  0x08052420 in EXEC_public_desc (class=0x80ac99c, object=0x0, 
desc=0x80c8834, nparam=0) at gbx_exec.c:1616
#9  0x0804b4fc in main (argc=1, argv=0xbffff3c4) at gbx.c:416
 >>

Could you elaborate on what you define as
<<
external functions
 >>
assuming you don't mean functions defined in other gambas modules or 
classes from the source folder, then the only thing that possibly stands 
out is the gb.ncurses component?


Yes I realise source code would help, and preferably a stripped down 
version that replicates the issue, but the former is rather large and 
frankly a mess from a rushed attempt to port from PowerBasic and the 
latter would take some time and could go a few different tacks, i.e. I 
could look to do this without ncurses to try and rule that out, but a 
console app is preferred so that effort if narrows it down to gb.ncurses 
is going to be thrown away and still leaves the issue to resolve.

I will try to find time to create a stripped down version to replicate 
the issue, which suspicion is currently around a class with a number of 
variables defined at top before any Sub or Function along with an 
Ncurses window excerpt is:
Private $hText As Window
Private sProductCode as String
Private sProductDescription as String
Private fPrice as Float

When the current code fails it is when it enters a routine to fetch data 
from a data file to populate the above variables which are then 
displayed via $hText.Print.

This works multiple times until the screen needs to scroll the content 
which it does all that and calls a routine to reset the data variables 
for the last line which performs the following
sProductCode = Space$(10)
sProductDescription = Space$(30)
fPrice = 0
and displays that to the screen via $hText.Print, still all okay.

But when it calls the routine to read from the data file that it 
SegFaults, currently on one my TraceLog calls.

So I will be trying to craft a cut down version around the above, though 
I would like to do that with a more recent version of Gambas Source.

Where should I pull the source from?

K.