stubgen/src/Type.m3


 Copyright (C) 1989, Digital Equipment Corporation           
 All rights reserved.                                        
 See the file COPYRIGHT for a full description.              

File: Type.m3 Last Modified On Mon Feb 28 16:52:17 PST 1994 by wobber Modified On Fri Jun 11 16:48:09 PDT 1993 by owicki Modified On Mon May 17 14:03:42 PDT 1993 by mjordan Modified On Fri Feb 2 10:35:09 PST 1990 by gnelson Modified On Wed Dec 20 18:07:50 1989 by kalsow

MODULE Type;

IMPORT Atom, Fmt, StubUtils, Text, Value, ValueProc;

TYPE Foo = OBJECT name: Qid; visited := FALSE; brandsOK := TRUE; END;

REVEAL T =  Foo BRANDED OBJECT END;

PROCEDURE ToText(t: T; byName: BOOLEAN := TRUE): Text.T =
  VAR text: Text.T;
  BEGIN
    IF t = NIL THEN RETURN "" END;
    IF t.name # NIL AND byName THEN RETURN QidToText(t.name); END;
    TYPECASE t OF
      | Char => RETURN "CHAR"
      | WideChar => RETURN "WIDECHAR"
      | UserDefined (ud) =>
          IF NUMBER(ud.elts^) = 0 THEN text := "";
          ELSE
            text := Atom.ToText(ud.elts[0]);
            FOR i := 1 TO LAST(ud.elts^) DO
              text := text & ", " & Atom.ToText(ud.elts[i]);
            END;
          END;
          RETURN "{" & text & "}";
      | Enumeration (enum) =>
          IF enum = boolean THEN RETURN "BOOLEAN"; END;
          StubUtils.Die("Type.ToText: unsupported enumeration type");
      | Subrange (sub) =>
          VAR min, max: INTEGER;
              ud: UserDefined;
          BEGIN
            IF sub = integer THEN RETURN "INTEGER" END;
            min := NARROW(sub.min, Value.Ordinal).ord;
            max := NARROW(sub.max, Value.Ordinal).ord;
            IF sub.base = integer THEN RETURN
               "[" & Fmt.Int(min) &  ".." & Fmt.Int(max) &"]"
            END;
            IF sub.base = char THEN RETURN
               "[VAL(" & Fmt.Int(min) &  ", CHAR) .. VAL(" &
                     Fmt.Int(max) & ", CHAR)]"
            END;
            IF sub.base = widechar THEN RETURN
               "[VAL(" & Fmt.Int(min) &  ", WIDECHAR) .. VAL(" &
                     Fmt.Int(max) & ", WIDECHAR)]"
            END;
            ud := NARROW(sub.base, UserDefined);
            RETURN "[" & ToText(sub.base) & "." & Atom.ToText(ud.elts[min]) &
                    ".." & ToText(sub.base) & "." & Atom.ToText(ud.elts[max]) &
                     "]";
          END;
      | Real => RETURN "REAL";
      | LongReal => RETURN "LONGREAL";
      | Extended => RETURN "EXTENDED";
      | Reference (ref) =>
          TYPECASE ref OF
          | Opaque (o) =>
            (* Type can only be displayed by name *)
            RETURN "***Error*** Opaque type only printed by name: "
                    & "supertype " & ToText(o.revealedSuperType);
            (* RETURN Atom.ToText(t.name.intf) & "." & Atom.ToText(t.name.item)*)
          | Object, Ref =>
            IF ref.brand # NIL THEN
              text := "BRANDED \"" &  Atom.ToText(ref.brand) & "\" ";
            ELSE
              text := ""
            END;
            TYPECASE ref OF
            | Object(o) =>
              RETURN ToText(o.super) & " " & text & "OBJECT\n" &
                   FieldsToText(o.fields) &
                  "\nMETHODS\n" & MethodsToText(o.methods) & "\nEND";
            | Ref (r) =>
              IF NOT r.traced THEN text := "UNTRACED " & text END;
              RETURN text & "REF " & ToText(r.target, TRUE);
            ELSE StubUtils.Die("Type.ToText: unsupported reference type");
            END;
          ELSE StubUtils.Die("Type.ToText: unsupported reference type");
          END;
      | Array (arr) =>
          IF arr.index = NIL THEN
            text := "";
          ELSE
            text := ToText(arr.index);
          END;
          RETURN "ARRAY " & text & " OF " & ToText(arr.element);
      | Packed (p) =>
          RETURN "BITS " & Fmt.Int(p.size) & "FORF " & ToText(p.base);
      | Record (rec) =>
            RETURN "RECORD " & FieldsToText(rec.fields) & " END";
      | Set (set) =>
          RETURN "SET OF " & ToText(set.range);
      | Procedure (proc) =>
          RETURN "PROCEDURE" & SigToText(proc.sig);
      ELSE  StubUtils.Die("Type.ToText: unsupported type");
    END;

    RETURN NIL;
  END ToText;

PROCEDURE QidToText(qid: Qid): TEXT =
  BEGIN
    IF qid.intf = nullAtm THEN RETURN Atom.ToText(qid.item)
    ELSE RETURN Atom.ToText(qid.intf) & "." & Atom.ToText(qid.item)
    END;
  END QidToText;

PROCEDURE SigToText(sig: Signature): TEXT =
  VAR result: TEXT;
      raises: TEXT;
  BEGIN
    IF sig.result # NIL THEN
      result := ": " & ToText(sig.result);
    ELSE
      result := "";
    END;
    IF sig.raises = NIL THEN
      raises := " RAISES ANY"
    ELSIF NUMBER(sig.raises^) = 0 THEN
      raises := "";
    ELSE
      raises := " RAISES {" & QidToText(sig.raises[0].qid);
      FOR i := 1 TO LAST(sig.raises^) DO
        raises := raises & ", " & QidToText(sig.raises[i].qid);
      END;
      raises := raises & "}";
    END;
    RETURN "(" & FormalsToText(sig.formals) & ")" & result & raises;
  END SigToText;

PROCEDURE FieldsToText(f: REF ARRAY OF Field): TEXT =
  VAR notFirst := FALSE;
      text := "";
  BEGIN
    FOR i := 0 TO LAST(f^) DO
      IF notFirst THEN text := text & "; "; END;
      notFirst := TRUE;
      text := text & Atom.ToText(f[i].name) & ": " &
                ToText(f[i].type);
      IF f[i].default # NIL THEN
        text := text & ":= " & ValueProc.ToText(f[i].default, f[i].type);
      END;
    END;
    RETURN text;
  END FieldsToText;

PROCEDURE MethodsToText(m: REF ARRAY OF Method): TEXT =
  VAR notFirst := FALSE;
      text := "";
  BEGIN
    FOR i := 0 TO LAST(m^) DO
      IF notFirst THEN text := text & ";\n"; END;
      notFirst := TRUE;
      text := text & Atom.ToText(m[i].name) & SigToText(m[i].sig);
      IF m[i].default # NIL THEN
        text := text & ":= " ;
        TYPECASE m[i].default OF
          MethodDefault1 (md1) => text := text & QidToText(md1.qid);
        | MethodDefault2 (md2) => text := text & ToText(md2.obType) &
                                 "." & Atom.ToText(md2.method);
        ELSE StubUtils.Die("Type.MethodsToText: unrecognized method value");
        END;
      END;
    END;
    RETURN text;
  END MethodsToText;

PROCEDURE FormalsToText(f: REF ARRAY OF Formal): TEXT =
  VAR notFirst := FALSE;
      text := "";
      modeName := ARRAY Mode OF TEXT {"", "VAR ", "READONLY "};
      outPrag: TEXT;
  BEGIN
    FOR i := 0 TO LAST(f^) DO
      IF notFirst THEN text := text & "; "; END;
      notFirst := TRUE;
      IF f[i].outOnly THEN outPrag := "<*OUT*> " ELSE outPrag := "" END;
      text := text & modeName[f[i].mode] & " " & outPrag &
                Atom.ToText(f[i].name) & ": " & ToText(f[i].type);
      IF f[i].default # NIL THEN
        text := text & ":= " & ValueProc.ToText(f[i].default, f[i].type);
      END;
    END;
    RETURN text;
  END FormalsToText;

PROCEDURE MayBeRefAny(t: T): BOOLEAN =
  BEGIN
    IF t = refany THEN RETURN TRUE; END;
    TYPECASE t OF
    | Ref, Object => RETURN FALSE;
    | Opaque (o) => RETURN MayBeRefAny(o.revealedSuperType);
    ELSE RETURN FALSE (* e.g. type TEXT *)
    END;
  END MayBeRefAny;

PROCEDURE NamedType(t: T): BOOLEAN =
  BEGIN
    RETURN t.name # NIL;
  END NamedType;

PROCEDURE Size (t: T): INTEGER = BEGIN END Size;

PROCEDURE MinSize (t: T): INTEGER = BEGIN END MinSize;

PROCEDURE Alignment (t: T): INTEGER = BEGIN END Alignment;

PROCEDURE Bounds (t: T): Interval.T = BEGIN END Bounds;

PROCEDURE Base (t: T): T = BEGIN END Base;

PROCEDURE IsTraced (t: T): BOOLEAN = BEGIN END IsTraced;

PROCEDURE IsEmpty (t: T): BOOLEAN = BEGIN END IsEmpty;

VAR nullAtm: Atom.T;

BEGIN
  nullAtm := Atom.FromText("");
  integer := NEW(Subrange,
                name := NEW(Qid, intf := nullAtm, item := Atom.FromText("INTEGER")),
                min := NEW(Value.Ordinal, ord:=FIRST(INTEGER)),
                max := NEW(Value.Ordinal, ord:=LAST(INTEGER)));
  integer.base := integer;

  cardinal := NEW(Subrange,
               name := NEW(Qid, intf := nullAtm, item := Atom.FromText("CARDINAL")),
               base := integer,
               min := NEW(Value.Ordinal, ord:=0),
               max := integer.max);

  boolean := NEW(UserDefined,
               name := NEW(Qid, intf := nullAtm, item := Atom.FromText("BOOLEAN")));
  boolean.elts := NEW(REF ARRAY OF Atom.T, 2);
  boolean.elts[0] := Atom.FromText("FALSE");
  boolean.elts[1] := Atom.FromText("TRUE");

  char :=    NEW(Char,
               name := NEW(Qid, intf := nullAtm, item := Atom.FromText("CHAR")));
  widechar := NEW(WideChar,
               name := NEW(Qid, intf := nullAtm, item := Atom.FromText("WIDECHAR")));
  real    := NEW(Real,
               name := NEW(Qid, intf := nullAtm, item := Atom.FromText("REAL")));
  longreal := NEW(LongReal, name :=
               NEW(Qid, intf := nullAtm, item := Atom.FromText("LONGREAL")));
  extended := NEW(Extended, name :=
               NEW(Qid, intf := nullAtm, item := Atom.FromText("EXTENDED")));
  refany  := NEW(Reference,
               name := NEW(Qid, intf := nullAtm, item := Atom.FromText("REFANY")),
               traced := TRUE);
  address := NEW(Reference,
               name := NEW(Qid, intf := nullAtm, item := Atom.FromText("ADDRESS")),
               traced := FALSE);
  root    := NEW(Object,
                 name := NEW(Qid, intf := nullAtm, item := Atom.FromText("ROOT")),
                 traced := TRUE,
                 fields := NEW(REF ARRAY OF Field, 0),
                 methods := NEW(REF ARRAY OF Method, 0));
  untracedRoot := NEW(Object,
                      name := NEW(Qid, intf := nullAtm,
                                  item := Atom.FromText("UNTRACED ROOT")),
                      traced := FALSE,
                      fields := NEW(REF ARRAY OF Field, 0),
                      methods := NEW(REF ARRAY OF Method, 0));
  null          := NEW(Reference,
                 name := NEW(Qid, intf := nullAtm, item := Atom.FromText("NULL")));
  text          := NEW(Opaque,
                 name := NEW(Qid, intf := nullAtm, item := Atom.FromText("TEXT")),
                 revealedSuperType := refany);
  mutex         := NEW(Opaque,
                 name := NEW(Qid, intf := nullAtm, item := Atom.FromText("MUTEX")),
                 revealedSuperType := root);
END Type.

interface Type is in:


interface Value is in:


interface ValueProc is in: