(* Title: Pure/Isar/runtime.ML
Author: Makarius
Isar toplevel runtime support.
*)
signature RUNTIME =
sig
exception UNDEF
exception TERMINATE
exception EXCURSION_FAIL of exn * string
exception TOPLEVEL_ERROR
val exn_context: Proof.context option -> exn -> exn
val exn_message: (exn -> Position.T) -> exn -> string
val debugging: ('a -> 'b) -> 'a -> 'b
val controlled_execution: ('a -> 'b) -> 'a -> 'b
val toplevel_error: (exn -> string) -> ('a -> 'b) -> 'a -> 'b
end;
structure Runtime: RUNTIME =
struct
(** exceptions **)
exception UNDEF;
exception TERMINATE;
exception EXCURSION_FAIL of exn * string;
exception TOPLEVEL_ERROR;
(* exn_context *)
exception CONTEXT of Proof.context * exn;
fun exn_context NONE exn = exn
| exn_context (SOME ctxt) exn = CONTEXT (ctxt, exn);
(* exn_message *)
fun if_context NONE _ _ = []
| if_context (SOME ctxt) f xs = map (f ctxt) xs;
fun exn_message exn_position e =
let
fun raised exn name msgs =
let val pos = Position.str_of (exn_position exn) in
(case msgs of
[] => "exception " ^ name ^ " raised" ^ pos
| [msg] => "exception " ^ name ^ " raised" ^ pos ^ ": " ^ msg
| _ => cat_lines (("exception " ^ name ^ " raised" ^ pos ^ ":") :: msgs))
end;
val detailed = ! Output.debugging;
fun exn_msg _ (CONTEXT (ctxt, exn)) = exn_msg (SOME ctxt) exn
| exn_msg ctxt (Exn.EXCEPTIONS exns) = cat_lines (map (exn_msg ctxt) exns)
| exn_msg ctxt (EXCURSION_FAIL (exn, loc)) =
exn_msg ctxt exn ^ Markup.markup Markup.location ("\n" ^ loc)
| exn_msg _ TERMINATE = "Exit."
| exn_msg _ Exn.Interrupt = "Interrupt."
| exn_msg _ TimeLimit.TimeOut = "Timeout."
| exn_msg _ TOPLEVEL_ERROR = "Error."
| exn_msg _ (SYS_ERROR msg) = "## SYSTEM ERROR ##\n" ^ msg
| exn_msg _ (ERROR msg) = msg
| exn_msg _ (exn as Fail msg) = raised exn "Fail" [msg]
| exn_msg _ (exn as THEORY (msg, thys)) =
raised exn "THEORY" (msg :: (if detailed then map Context.str_of_thy thys else []))
| exn_msg _ (exn as Syntax.AST (msg, asts)) = raised exn "AST" (msg ::
(if detailed then map (Pretty.string_of o Syntax.pretty_ast) asts else []))
| exn_msg ctxt (exn as TYPE (msg, Ts, ts)) = raised exn "TYPE" (msg ::
(if detailed then
if_context ctxt Syntax.string_of_typ Ts @ if_context ctxt Syntax.string_of_term ts
else []))
| exn_msg ctxt (exn as TERM (msg, ts)) = raised exn "TERM" (msg ::
(if detailed then if_context ctxt Syntax.string_of_term ts else []))
| exn_msg ctxt (exn as THM (msg, i, thms)) = raised exn ("THM " ^ string_of_int i) (msg ::
(if detailed then if_context ctxt Display.string_of_thm thms else []))
| exn_msg _ exn = raised exn (General.exnMessage exn) [];
in exn_msg NONE e end;
(** controlled execution **)
fun debugging f x =
if ! Output.debugging then
Exn.release (exception_trace (fn () =>
Exn.Result (f x) handle
exn as UNDEF => Exn.Exn exn
| exn as EXCURSION_FAIL _ => Exn.Exn exn))
else f x;
fun controlled_execution f =
f
|> debugging
|> Future.interruptible_task;
fun toplevel_error exn_message f x =
let val ctxt = Option.map Context.proof_of (Context.thread_data ()) in
f x handle exn =>
(Output.error_msg (exn_message (exn_context ctxt exn));
raise TOPLEVEL_ERROR)
end;
end;