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structure GlobalExnHandler: sig val handler: exn -> unit end = struct
fun eprint s = printLn $ "error: " ^ s
fun otherExn e =
let
val hist = MLton.Exn.history e
in
eprint $ "exception " ^ exnMessage e ^ " was raised";
if hist = [] then
(printLn "No stack trace is avaliable";
printLn "Recompile with -const \"Exn.keepHistory true\"")
else
List.app (fn x => printLn $ "\t" ^ x) hist
end
fun exit code = Posix.Process.exit $ Word8.fromInt code
fun ioExn (IO.Io { name, function = _, cause }) =
let
open OS
val prefix = name ^ ": "
val reason =
case cause of
SysErr (str, _) => str
| _ => exnMessage cause
in
printLn $ prefix ^ reason
end
| ioExn _ = (printLn "ioExn: unreachable"; exit 254)
fun handler e =
let
open Tokenizer
in
(case e of
FsmTableIsTooSmall =>
eprint "fsm table is too small. Increate 'maxState' value"
| IO.Io _ => ioExn e
| TkErrorAug (pos, msg) => eprint $ Stream.ppos2str pos ^ ": " ^ msg
| _ => otherExn e;
exit 255)
end
end
val () = MLton.Exn.setTopLevelHandler GlobalExnHandler.handler
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