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(* M2Bitset.mod provides the BITSET type.
Copyright (C) 2003-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Modula-2; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE M2Bitset ;
FROM M2Debug IMPORT Assert ;
FROM m2tree IMPORT Tree ;
FROM m2linemap IMPORT BuiltinsLocation ;
FROM m2type IMPORT GetWordType ;
FROM m2decl IMPORT GetBitsPerBitset ;
FROM m2expr IMPORT GetSizeOf ;
FROM M2ALU IMPORT PushCard, PushIntegerTree ;
FROM NameKey IMPORT MakeKey ;
FROM M2System IMPORT Word ;
FROM M2Base IMPORT Cardinal ;
FROM M2LexBuf IMPORT BuiltinTokenNo ;
FROM SymbolTable IMPORT NulSym,
MakeConstLit,
MakeConstVar,
MakeSet,
MakeSubrange,
PutSet,
PutSubrange,
PopValue,
PopSize ;
VAR
MinBitset, MaxBitset : CARDINAL ;
(*
MakeBitset - creates and declares the type BITSET.
*)
PROCEDURE MakeBitset ;
BEGIN
Bitset := MakeSet (BuiltinTokenNo, MakeKey('BITSET')) ; (* Base Type *)
(* MinBitset *)
MinBitset := MakeConstLit (BuiltinTokenNo, MakeKey('0'), Cardinal) ;
(* MaxBitset *)
MaxBitset := MakeConstVar (BuiltinTokenNo, MakeKey('MaxBitset')) ;
PushCard (GetBitsPerBitset()-1) ;
PopValue (MaxBitset) ;
Assert (Word#NulSym) ;
Bitnum := MakeSubrange (BuiltinTokenNo, MakeKey('BITNUM')) ;
PutSubrange (Bitnum, MinBitset, MaxBitset, Cardinal) ;
PutSet (Bitset, Bitnum, FALSE) ;
PushIntegerTree (GetSizeOf(BuiltinsLocation(), GetWordType())) ;
PopSize (Bitset)
END MakeBitset ;
(*
GetBitsetMinMax - assigns min and max to the minimum and maximum values of BITSET.
*)
PROCEDURE GetBitsetMinMax (VAR min, max: CARDINAL) ;
BEGIN
min := MinBitset ;
max := MaxBitset
END GetBitsetMinMax ;
END M2Bitset.
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