I define a command in .gdbinit to display a Python stack trace:
define ppystack
set $__fr = 0
select-frame $__fr
while $pc < Py_Main || $pc > Py_GetArgcArgv
if $pc > eval_code2 && $pc < set_exc_info || $pc > eval_code2r && $pc <
ceval_end
set $__fn = PyString_AsString(co->co_filename)
set $__n = PyString_AsString(co->co_name)
printf "%s (%d): %s\n", $__fn, f->f_lineno, $__n
end
set $__fr = $__fr + 1
select-frame $__fr
end
select-frame 0
end
This works fine unless the stack is a bit bolluxed up, in which case, even
though my test of the range of $pc succeeds, gdb might tell me there is no
variable named "co" in the local scope, bombing out of the stack print at
that point. Is there a way to test if a variable exists in the local scope
before accessing it? I'm thinking of something like
if defined("co")
do stuff with co->...
end
but couldn't find anything in the gdb info file.
Thanks,
Skip Montanaro
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