src/Pure/ML-Systems/smlnj.ML
author paulson
Wed, 22 Jun 2005 11:20:45 +0200
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child 16542 1259088dc448
permissions -rw-r--r--
pointer equality for sml/nj
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(*  Title:      Pure/ML-Systems/smlnj.ML
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    ID:         $Id$
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    Author:     Carsten Clasohm and Markus Wenzel, TU Muenchen
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Compatibility file for Standard ML of New Jersey 110 or later.
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*)
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(case #version_id (Compiler.version) of
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  [110, x] => if x >= 35 then use "ML-Systems/smlnj-compiler.ML" else ()
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| _ => ());
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(** ML system related **)
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(* low-level pointer equality *)
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(*proper implementation available? This declaration may get overridden below.*)
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fun pointer_eq (x:''a, y) = false;
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(case #version_id (Compiler.version) of
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  [110, x] => if x >= 49 then use "ML-Systems/smlnj-ptreql.ML" else ()
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| _ => ());
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(* restore old-style character / string functions *)
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val ord     = SML90.ord;
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val chr     = SML90.chr;
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val explode = SML90.explode;
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val implode = SML90.implode;
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(* New Jersey ML parameters *)
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val _ =
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 (Compiler.Control.Print.printLength := 1000;
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  Compiler.Control.Print.printDepth := 350;
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  Compiler.Control.Print.stringDepth := 250;
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  Compiler.Control.Print.signatures := 2;
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  Compiler.Control.MC.matchRedundantError := false);
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(* Poly/ML emulation *)
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fun quit () = exit 0;
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(*limit the printing depth -- divided by 2 for comparibility with Poly/ML*)
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fun print_depth n =
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 (Compiler.Control.Print.printDepth := n div 2;
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  Compiler.Control.Print.printLength := n);
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(* compiler-independent timing functions *)
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(case #version_id (Compiler.version) of
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  [110, x] => if x >= 44
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	      then use "ML-Systems/cpu-timer-basis.ML"
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	      else use "ML-Systems/cpu-timer-gc.ML"
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| _ => use "ML-Systems/cpu-timer-gc.ML");
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(* prompts *)
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fun ml_prompts p1 p2 =
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  (Compiler.Control.primaryPrompt := p1; Compiler.Control.secondaryPrompt := p2);
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(case #version_id (Compiler.version) of
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  [110, x] => if x >= 44
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	      then use "ML-Systems/smlnj-basis-compat.ML"
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	      else ()
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| _ => ());
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(* toplevel pretty printing (see also Pure/install_pp.ML) *)
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(case #version_id (Compiler.version) of
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  [110, x] => if x >= 44
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	      then use "ML-Systems/smlnj-pp-new.ML"
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	      else use "ML-Systems/smlnj-pp-old.ML"
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| _ => use "ML-Systems/smlnj-pp-old.ML");
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fun install_pp (path, pp) = Compiler.PPTable.install_pp path pp;
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(* ML command execution *)
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fun use_text (print, err) verbose txt =
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  let
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    val ref out_orig = Compiler.Control.Print.out;
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    val out_buffer = ref ([]: string list);
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    val out = {say = (fn s => out_buffer := s :: ! out_buffer), flush = (fn () => ())};
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    fun output () =
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      let val str = implode (rev (! out_buffer))
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      in String.substring (str, 0, Int.max (0, size str - 1)) end;
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  in
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    Compiler.Control.Print.out := out;
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    Compiler.Interact.useStream (TextIO.openString txt) handle exn =>
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      (Compiler.Control.Print.out := out_orig; err (output ()); raise exn);
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    Compiler.Control.Print.out := out_orig;
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    if verbose then print (output ()) else ()
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  end;
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(** interrupts **)
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exception Interrupt;
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local
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fun capture f x = ((f x): unit; NONE) handle exn => SOME exn;
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fun release NONE = ()
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  | release (SOME exn) = raise exn;
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in
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fun ignore_interrupt f x =
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  let
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    val old_handler = Signals.setHandler (Signals.sigINT, Signals.IGNORE);
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    val result = capture f x;
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    val _ = Signals.setHandler (Signals.sigINT, old_handler);
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  in release result end;
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fun raise_interrupt f x =
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  let
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    val interrupted = ref false;
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    val result = ref NONE;
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    val old_handler = Signals.inqHandler Signals.sigINT;
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  in
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    SMLofNJ.Cont.callcc (fn cont =>
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      (Signals.setHandler (Signals.sigINT, Signals.HANDLER (fn _ => (interrupted := true; cont)));
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      result := capture f x));
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    Signals.setHandler (Signals.sigINT, old_handler);
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    if ! interrupted then raise Interrupt else release (! result)
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  end;
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end;
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(** Signal handling: emulation of the Poly/ML Signal structure. Note that types 
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    Posix.Signal.signal and Signals.signal differ **)
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structure IsaSignal =
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struct
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datatype sig_handle = SIG_DFL | SIG_IGN | SIG_HANDLE of Signals.signal -> unit;
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(*From the SML/NJ documentation:
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"HANDLER(f) installs a handler for a signal. When signal is delivered to the process, the execution state of the current thread will be bundled up as a continuation k, then f(signal,n,k) will be called. The number n is the number of times signal has been signalled since the last time f was invoked for it."*)
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fun toAction SIG_DFL = Signals.DEFAULT
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  | toAction SIG_IGN = Signals.IGNORE
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  | toAction (SIG_HANDLE iu) = 
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      Signals.HANDLER (fn (signo,_,cont) => (iu signo; cont));
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(*The types are correct, but I'm not sure about the semantics!*)
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fun fromAction Signals.DEFAULT = SIG_DFL
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  | fromAction Signals.IGNORE = SIG_IGN
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  | fromAction (Signals.HANDLER f) = 
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      SIG_HANDLE (fn signo => SMLofNJ.Cont.callcc (fn k => (f (signo,0,k); ())));
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(*Poly/ML version has type  int * sig_handle -> sig_handle*)
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fun signal (signo, sh) = fromAction (Signals.setHandler (signo, toAction sh));
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val usr1 = UnixSignals.sigUSR1
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val usr2 = UnixSignals.sigUSR2
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end;
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(** OS related **)
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(* system command execution *)
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(*execute Unix command which doesn't take any input from stdin and
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  sends its output to stdout; could be done more easily by Unix.execute,
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  but that function doesn't use the PATH*)
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fun execute command =
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  let
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    val tmp_name = OS.FileSys.tmpName ();
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    val is = (OS.Process.system (command ^ " > " ^ tmp_name); TextIO.openIn tmp_name);
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    val result = TextIO.inputAll is;
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  in
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    TextIO.closeIn is;
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    OS.FileSys.remove tmp_name;
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    result
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  end;
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(*plain version; with return code*)
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val system = OS.Process.system: string -> int;
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(* getenv *)
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fun getenv var =
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  (case OS.Process.getEnv var of
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    NONE => ""
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  | SOME txt => txt);