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wrong-type-arg in scm_display_backtrace
From: |
William Morgan |
Subject: |
wrong-type-arg in scm_display_backtrace |
Date: |
Tue, 24 Dec 2002 16:46:07 -0500 |
User-agent: |
Mutt/1.4i |
Dear experts,
I am writing a C program that uses Guile as a scripting engine. In the
process of doing this, 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 code (mostly copied from an old email here
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 <address@hidden>
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