swipl crashes when handling uninitialized pl functor (through CFFI)

It was a mistake on my part as I forgot to initialize some functor_t
variables. When PL_unify_term is called on the uninitialized functor the
whole program crashes. I am using swi 6.4.1 on a Windows 8 machine.

This is not a big deal as it was a bug on my part in the first place but I
thought it may be worth reporting as crashing may not be the best response
here:-) Here is the first part of the stack trace:

%@ Stack trace labeled "crash":
%@   [0] <c:\Program
Files\swipl\bin\libswipl.dll>:PL_unify_functor+000000007020D39C
%@   [1] <c:\Program
Files\swipl\bin\libswipl.dll>:PL_warning+000000007020BB9D
%@   [2] <c:\Program
Files\swipl\bin\libswipl.dll>:PL_unify_term+000000007020BFF2

I believe it is in response to a call like this:

PL_unify_term(t_node_literal,
              PL_FUNCTOR, FUNCTOR_literal1,
              PL_TERM, t_node)

with the FUNCTOR_literal1 being either uninitialized or garbage collected
between foreign calls.

Incidentally what is the best way to keep a term like FUNCTOR_literal1 that
is really a constant across foreign calls?

Haitao
-------------- next part --------------
HTML attachment scrubbed and removed