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

    ID:         $Id$

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

*)

use "ML-Systems/exn.ML";

if List.exists (fn s => s = "Universal") (PolyML.Compiler.structureNames ()) then ()

else use "ML-Systems/universal.ML";

use "ML-Systems/multithreading.ML";

use "ML-Systems/time_limit.ML";

use "ML-Systems/system_shell.ML";

(** ML system and platform related **)

(* Compiler options *)

val ml_system_fix_ints = false;

PolyML.Compiler.printInAlphabeticalOrder := false;

PolyML.Compiler.maxInlineSize := 80;

(* String compatibility *)

(*low-level pointer equality*)

val pointer_eq = Address.wordEq;

(* 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 CPUtimer = Timer.startCPUTimer();

      val time = Timer.checkCPUTimer(CPUtimer)

  in  (CPUtimer,time)  end;

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

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

      val {sys=sys2,usr=usr2} = Timer.checkCPUTimer(CPUtimer)

  in  "User " ^ toString (usr2-usr) ^

      "  All "^ toString (sys2-sys + usr2-usr) ^

      " secs"

      handle Time => ""

  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;

(* ML command execution -- 'eval' *)

fun use_text (tune: string -> string) name (print, err) verbose txt =

  let

    val in_buffer = ref (explode (tune txt));

    val out_buffer = ref ([]: string list);

    fun output () = implode (rev (case ! out_buffer of "\n" :: cs => cs | cs => cs));

    fun get () =

      (case ! in_buffer of

        [] => ""

      | c :: cs => (in_buffer := cs; c));

    fun put s = out_buffer := s :: ! out_buffer;

    fun exec () =

      (case ! in_buffer of

        [] => ()

      | _ => (PolyML.compiler (get, put) (); exec ()));

  in

    exec () handle exn =>

      (err ((if name = "" then "" else "Error in " ^ name ^ "\n") ^ output ()); raise exn);

    if verbose then print (output ()) else ()

  end;

fun use_file tune output verbose name =

  let

    val instream = TextIO.openIn name;

    val txt = TextIO.inputAll instream before TextIO.closeIn instream;

  in use_text tune name output verbose txt end;

(*eval command line arguments*)

local

  fun println s =

    (TextIO.output (TextIO.stdOut, s ^ "\n"); TextIO.flushOut TextIO.stdOut);

  fun eval "-q" = ()

    | eval txt = use_text (fn x => x) "" (println, println) false txt;

in

  val _ = PolyML.onEntry (fn () =>

   (Signal.signal (2, Signal.SIG_HANDLE (fn _ => Process.interruptConsoleProcesses ()));

    app eval (CommandLine.arguments ())));

end;

(** interrupts **)

exception Interrupt = SML90.Interrupt;

local

val sig_int = 2;

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

val _ = 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 **)

(* Posix patches *)

(*This extension of the Poly/ML Signal structure is only necessary

  because in SML/NJ, types Posix.Signal.signal and Signals.signal differ.*)

structure IsaSignal =

struct

  open Signal

  val usr1 = Posix.Signal.usr1

  val usr2 = Posix.Signal.usr2

  val alrm = Posix.Signal.alrm

  val chld = Posix.Signal.chld

  val cont = Posix.Signal.cont

  val int  = Posix.Signal.int

  val quit = Posix.Signal.quit

end;

(* current directory *)

val cd = OS.FileSys.chDir;

val pwd = OS.FileSys.getDir;

(*Convert a process ID to a decimal string (chiefly for tracing)*)

fun string_of_pid pid =

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

(* 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;