[snipe.git] / util / errormsg.sml

(* L1 Compiler
 * Error messages
 * Author: Kaustuv Chaudhuri <kaustuv+@cs.cmu.edu>
 * Annotations: Alex Vaynberg <alv@andrew.cmu.edu>
 * Modified: Frank Pfenning <fp@cs.cmu.edu>
 *)

signature ERRORMSG =
sig
  (* clears out all errors from the system *)
  val reset : unit -> unit
        
  (* global flag that indicates whether there were errors *)
  val anyErrors : bool ref

  (* sets the error flag and prints out an error message, does NOT raise ERROR *)
  val error : Mark.ext option -> string -> unit
  (* same, but does not increment error count *)
  val warn : Mark.ext option -> string -> unit

  (* generic code stopping exception *)
  exception Error
  exception InternalError of string
end

structure ErrorMsg :> ERRORMSG =
struct
  (* Initial values of compiler state variables *)
  val anyErrors = ref false
                   
  fun reset() = ( anyErrors := false )
              
  fun msg str ext note =
      (anyErrors := true;
       Option.map (TextIO.print o Mark.show) ext;
       List.app TextIO.print [":", str, ":", note, "\n"])
    
  fun error ext note = (anyErrors := true; msg "error" ext note)
  fun warn ext note = msg "warning" ext note
               
  (* Print the given error message and then abort compilation *)
  exception Error
  exception InternalError of string
end