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@@ -1,5 +1,31 @@ 2014-02-16 Kaz Kylheku <kaz@kylheku.com> + In the spirit of the previous hack, here is another hack to + alleviate a long-standing pain: when an exception happens in + TXR's library somewhere, the program dies without leaving + a clue about what code was being evaluated when that happened. + What we can do is have the evaluator publish the most recent + compound form it has processed by stashing it in a variable. + Then when an unhandled exception occurs, we can peek at that + and try to pull out source location info. + + * eval.c (last_form_evaled): New variable. + (do_eval): When evaluating a compound form, stash it in + last_form_evaled. + (eval_init): Protect last_form_evaled from gc. + + * eval.h (last_form_evaled): Declared. + (eval_error_s): Existing variable declared. + + * unwind.c: Has to include "eval.h" for the above variable + and "parser.h" for the source_loc function. + (uw_throw): When an exception is unhandled, if + last_form_evaled has source info, add it to the diagnostic. + But not if the exception is eval-error; because errors from + the evaluators already have the info. + +2014-02-16 Kaz Kylheku <kaz@kylheku.com> + Nice idea: how about a function which walks the tree structure and back-fills some missing source code location info. We apply this to macro expansions. If some error occurs in expanded code, this way it |