cmdline: use handler instead of catch for errors.

Errors encountered when parsing or evaluating a source file
should be handled using a handler rather than a catch, so that
the unwind stack is available to the error reporting function.
This anticipates being able to dump a backtrace.

* txr.c (parse_once_noerr, read_eval_stream_noerr): Adjust
to reduced argument count in ignerr_func_body macro.

* unwind.c (uw_trace_error): New function.

* unwind.h (uw_trace_error): Declared.
(ignerr_func_body): Revised to establish a handler in addition
to the catch. The catch now doesn't do anything other than
provide an intercepting exit point; the error_trace call is
moved into the handler, and so it executes in a context where
unwinding hasn't happened yet.

0 files changed, 0 insertions, 0 deletions