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