argument, which specifies the value to return to the catch, or the
data to give to the condition handler. Renamed to
unwind_to_catch, to reflect new role.
(Fsignal, Fthrow): Removed code to set catch tag value and do the
long-jump; this is taken care of by unwind_to_catch.
of this structure; it is always equal to the poll_suppress_count
of its catchtag structure. The non-local exit code in eval.c is
difficult enough to understand as it is; needless duplication
doesn't help.
* lisp.h (struct specbinding, struct handler): More documentation.
about setting h.poll_suppress_count; it's guaranteed to be the
same as c.poll_suppress_count.
(internal_condition_case): Don't worry about
h.poll_suppress_count.
(Fsignal): Use h->tag->poll_suppress_count instead of
h->poll_suppress_count.
* eval.c (Fsignal): It's okay for the debugger to return to the
caller if the caller was signalling a quit.
* eval.c (unbind_catch): Restore the polling suppression count
here, instead of in Fsignal and Fthrow.
(Fthrow, Fsignal): Don't restore the polling suppression count here.
* eval.c (struct catchtag): More documentation.
* eval.c (entering_debugger): Variable renamed
when_entered_debugger, and is now a timestamp based on
num_nonmacro_input_chars.
(init_eval): Initialize when_entered_debugger, not
entering_debugger.
(call_debugger): Set when_entered_debugger to the current value of
num_nonmacro_input_chars.
(find_handler_clause): Don't call debugger unless
num_nonmacro_input_chars is greater than when_entered_debugger;
that way, we won't call the debugger unless the user has had a
chance to take control.
(Fbacktrace): Don't clear entering_debugger here.
(Fverify_visited_file_modtime):
Pass buffer itself to handler, if have handler.
(Fwrite_region): GCPRO around Fexpand_file_name, Ffie_name_directory.
(Fread_file_name_internal): GCPRO around file name manip.
(Ffile_writable_p, Ffile_readable_p): Use abspath, not filename,
(Ffile_executable_p, Ffile_exists_p): to run the handler.
(Fset_file_modes, Ffile_directory_p, Ffile_modes): Likewise.
(Ffile_newer_than_file_p): GCPRO around expand_and_dir_to_file.
if comment-end is 2 chars, assume it does end a comment.
Otherwise, scan back to previous comment-end to see if there's
a comment starter between. Also record whether the string quotes
between the start and the end are paired and uniform.
If so, skip to comment starter. If not, scan from start of
defun to find comment starter if any.
(find_defun_start): New function.
