(*  Title:      Pure/ML-Systems/polyml_common.ML

Compatibility file for Poly/ML -- common part for 4.x and 5.x.

*)

exception Interrupt = SML90.Interrupt;

use "ML-Systems/exn.ML";

use "ML-Systems/multithreading.ML";

use "ML-Systems/time_limit.ML";

use "ML-Systems/system_shell.ML";

use "ML-Systems/ml_name_space.ML";

use "ML-Systems/ml_pretty.ML";

(** ML system and platform related **)

val forget_structure = PolyML.Compiler.forgetStructure;

(* Compiler options *)

val ml_system_fix_ints = false;

PolyML.Compiler.printInAlphabeticalOrder := false;

PolyML.Compiler.maxInlineSize := 80;

(* old Poly/ML emulation *)

local

  val orig_exit = exit;

in

  open PolyML;

  val exit = orig_exit;

  fun quit () = exit 0;

end;

(* restore old-style character / string functions *)

val ord = SML90.ord;

val chr = SML90.chr;

val explode = SML90.explode;

val implode = SML90.implode;

(* compiler-independent timing functions *)

fun start_timing () =

  let

    val timer = Timer.startCPUTimer ();

    val time = Timer.checkCPUTimer timer;

  in (timer, time) end;

fun end_timing (timer, {sys, usr}) =

  let

    open Time;  (*...for Time.toString, Time.+ and Time.- *)

    val {sys = sys2, usr = usr2} = Timer.checkCPUTimer timer;

    val user = usr2 - usr;

    val all = user + sys2 - sys;

    val message = "User " ^ toString user ^ "  All "^ toString all ^ " secs" handle Time => "";

  in {message = message, user = user, all = all} end;

fun check_timer timer =

  let

    val {sys, usr} = Timer.checkCPUTimer timer;

    val gc = Timer.checkGCTime timer;    (* FIXME already included in usr? *)

  in (sys, usr, gc) end;

(* prompts *)

fun ml_prompts p1 p2 = (PolyML.Compiler.prompt1 := p1; PolyML.Compiler.prompt2 := p2);

(* toplevel pretty printing (see also Pure/pure_setup.ML) *)

fun make_pp _ pprint (str, blk, brk, en) _ _ obj =

  pprint obj (str, fn ind => blk (ind, false), fn wd => brk (wd, 0),

    fn () => brk (99999, 0), en);

(*print depth*)

local

  val depth = ref 10;

in

  fun get_print_depth () = ! depth;

  fun print_depth n = (depth := n; PolyML.print_depth n);

end;

(** interrupts **)

local

val sig_int = 2;

val default_handler = Signal.SIG_HANDLE (fn _ => Process.interruptConsoleProcesses ());

val _ = Signal.signal (sig_int, default_handler);

val _ = PolyML.onEntry (fn () => (Signal.signal (sig_int, default_handler); ()));

fun change_signal new_handler f x =

  let

    (*RACE wrt. other signals!*)

    val old_handler = Signal.signal (sig_int, new_handler);

    val result = Exn.capture (f old_handler) x;

    val _ = Signal.signal (sig_int, old_handler);

  in Exn.release result end;

in

fun interruptible f = change_signal default_handler (fn _ => f);

fun uninterruptible f =

  change_signal Signal.SIG_IGN

    (fn old_handler => f (fn g => change_signal old_handler (fn _ => g)));

end;

(** OS related **)

(* current directory *)

val cd = OS.FileSys.chDir;

val pwd = OS.FileSys.getDir;

fun process_id () =

  Word.fmt StringCvt.DEC (Word.fromLargeWord (Posix.Process.pidToWord (Posix.ProcEnv.getpid ())));

(* getenv *)

fun getenv var =

  (case OS.Process.getEnv var of

    NONE => ""

  | SOME txt => txt);

(* profile execution *)

fun profile 0 f x = f x

  | profile n f x =

      let

        val _ = RunCall.run_call1 RuntimeCalls.POLY_SYS_profiler n;

        val res = Exn.capture f x;

        val _ = RunCall.run_call1 RuntimeCalls.POLY_SYS_profiler 0;

      in Exn.release res end;