From: William Morgan <wmorgan-gu2@masanjin.net>
Subject: wrong-type-arg in scm_display_backtrace
Date: Sun, 29 Dec 2002 20:31:49 -0500 [thread overview]
Message-ID: <20021230013149.GB25056@masanjin.net> (raw)
Dear Guile experts,
I am writing a C program that uses Guile as a scripting engine. There
doesn't seem to be a lot of documentation about this aspect of Guile and
I am relying my interpretation of other people's code. Now I have a
problem.
I need to catch Guile exceptions in my own handler. However, when I try
to display the backtrace, I invariably get the following message:
Exception during displaying of backtrace: wrong-type-arg
Here's the exception-handling procedure I'm passing to scm_internal_cwdr
(mostly copied from an old email by Mikael Djurfeldt):
--- cut here ---
SCM guile_error_handler(void *data, SCM tag, SCM throw_args) {
SCM port = scm_def_errp;
if (scm_ilength (throw_args) >= 3) {
SCM stack = scm_fluid_ref(SCM_VARIABLE_REF (scm_the_last_stack_fluid_var));
SCM subr = SCM_CAR (throw_args);
SCM message = SCM_CADR (throw_args);
SCM args = SCM_CADDR (throw_args);
scm_newline (port);
scm_display_backtrace (stack, port, SCM_UNDEFINED, SCM_UNDEFINED);
scm_newline (port);
scm_display_error (stack, port, subr, message, args, SCM_EOL);
return SCM_BOOL_F;
}
else {
scm_puts ("uncaught throw to ", port);
scm_prin1 (tag, port, 0);
scm_puts (": ", port);
scm_prin1 (throw_args, port, 1);
scm_putc ('\n', port);
}
return SCM_BOOL_T;
}
--- cut here ---
I don't fully understand the internals of Guile, particlarly how to deal with
fluids, so perhaps my treatment of scm_the_last_stack_fluid_var is incorrect?
(But the call to scm_display_error seems fine...)
Any help would be appreciated.
Thanks,
--
William <wmorgan-gu2@masanjin.net>
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next reply other threads:[~2002-12-30 1:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-30 1:31 William Morgan [this message]
2002-12-31 23:42 ` wrong-type-arg in scm_display_backtrace Neil Jerram
2003-01-05 3:57 ` William Morgan
2003-01-06 19:06 ` Neil Jerram
2003-01-07 5:42 ` William Morgan
2003-01-08 20:21 ` Neil Jerram
2003-01-08 22:38 ` William Morgan
2003-01-09 23:42 ` Neil Jerram
2003-01-10 20:31 ` vports from c questions William Morgan
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