src/Pure/ML-Systems/polyml_common.ML
author wenzelm
Mon, 29 Sep 2008 21:26:49 +0200
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child 28443 de653f1ad78b
permissions -rw-r--r--
added type pp, which helps installing polymorphic pretty printers;
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(*  Title:      Pure/ML-Systems/polyml_common.ML
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    ID:         $Id$
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Compatibility file for Poly/ML -- common part for 4.x and 5.x.
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*)
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use "ML-Systems/exn.ML";
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use "ML-Systems/multithreading.ML";
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use "ML-Systems/time_limit.ML";
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use "ML-Systems/system_shell.ML";
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use "ML-Systems/ml_name_space.ML";
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(** ML system and platform related **)
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val forget_structure = PolyML.Compiler.forgetStructure;
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(* Compiler options *)
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val ml_system_fix_ints = false;
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PolyML.Compiler.printInAlphabeticalOrder := false;
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PolyML.Compiler.maxInlineSize := 80;
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(* old Poly/ML emulation *)
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local
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  val orig_exit = exit;
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in
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  open PolyML;
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  val exit = orig_exit;
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  fun quit () = exit 0;
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end;
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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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(* compiler-independent timing functions *)
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fun start_timing () =
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  let val CPUtimer = Timer.startCPUTimer();
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      val time = Timer.checkCPUTimer(CPUtimer)
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  in  (CPUtimer,time)  end;
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fun end_timing (CPUtimer, {sys,usr}) =
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  let open Time  (*...for Time.toString, Time.+ and Time.- *)
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      val {sys=sys2,usr=usr2} = Timer.checkCPUTimer(CPUtimer)
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  in  "User " ^ toString (usr2-usr) ^
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      "  All "^ toString (sys2-sys + usr2-usr) ^
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      " secs"
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      handle Time => ""
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  end;
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fun check_timer timer =
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  let
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    val {sys, usr} = Timer.checkCPUTimer timer;
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    val gc = Timer.checkGCTime timer;    (* FIXME already included in usr? *)
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  in (sys, usr, gc) end;
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(* prompts *)
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fun ml_prompts p1 p2 = (PolyML.Compiler.prompt1 := p1; PolyML.Compiler.prompt2 := p2);
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(* toplevel pretty printing (see also Pure/pure_setup.ML) *)
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type ('a, 'b) pp =
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  (string -> unit) * (int * bool -> unit) * (int * int -> unit) * (unit -> unit) ->
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    int -> ('a * int -> unit) -> 'b -> unit;
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fun make_pp _ pprint (str, blk, brk, en) _ _ obj =
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  pprint obj (str, fn ind => blk (ind, false), fn wd => brk (wd, 0),
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    fn () => brk (99999, 0), en);
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(*print depth*)
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local
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  val depth = ref 10;
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in
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  fun get_print_depth () = ! depth;
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  fun print_depth n = (depth := n; PolyML.print_depth n);
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end;
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(** interrupts **)
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exception Interrupt = SML90.Interrupt;
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local
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val sig_int = 2;
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val default_handler = Signal.SIG_HANDLE (fn _ => Process.interruptConsoleProcesses ());
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val _ = Signal.signal (sig_int, default_handler);
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val _ = PolyML.onEntry (fn () => (Signal.signal (sig_int, default_handler); ()));
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fun change_signal new_handler f x =
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  let
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    (*RACE wrt. other signals!*)
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    val old_handler = Signal.signal (sig_int, new_handler);
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    val result = Exn.capture (f old_handler) x;
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    val _ = Signal.signal (sig_int, old_handler);
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  in Exn.release result end;
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in
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fun interruptible f = change_signal default_handler (fn _ => f);
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fun uninterruptible f =
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  change_signal Signal.SIG_IGN
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    (fn old_handler => f (fn g => change_signal old_handler (fn _ => g)));
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end;
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(** OS related **)
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(* Posix patches *)
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(*This extension of the Poly/ML Signal structure is only necessary
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  because in SML/NJ, types Posix.Signal.signal and Signals.signal differ.*)
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structure IsaSignal =
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struct
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  open Signal
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  val usr1 = Posix.Signal.usr1
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  val usr2 = Posix.Signal.usr2
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  val alrm = Posix.Signal.alrm
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  val chld = Posix.Signal.chld
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  val cont = Posix.Signal.cont
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  val int  = Posix.Signal.int
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  val quit = Posix.Signal.quit
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end;
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(* current directory *)
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val cd = OS.FileSys.chDir;
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val pwd = OS.FileSys.getDir;
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(*Convert a process ID to a decimal string (chiefly for tracing)*)
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fun string_of_pid pid =
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  Word.fmt StringCvt.DEC (Word.fromLargeWord (Posix.Process.pidToWord pid));
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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);
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(* profile execution *)
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fun profile 0 f x = f x
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  | profile n f x =
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      let
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        val _ = RunCall.run_call1 RuntimeCalls.POLY_SYS_profiler n;
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        val res = Exn.capture f x;
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        val _ = RunCall.run_call1 RuntimeCalls.POLY_SYS_profiler 0;
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      in Exn.release res end;
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