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123 lines
4.1 KiB
C
123 lines
4.1 KiB
C
/* ref.c: REFERENCES
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*
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* $Id$
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* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
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*
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* .purpose: Implement operations on Ref, RefSet, ZoneSet, and Rank.
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*
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* .design: See design.mps.ref and design.mps.refset.
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*/
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#include "mpm.h"
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SRCID(ref, "$Id$");
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/* RankCheck -- check a rank value */
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Bool RankCheck(Rank rank)
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{
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CHECKL(rank < RankLIMIT);
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UNUSED(rank); /* <code/mpm.c#check.unused> */
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return TRUE;
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}
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/* RankSetCheck -- check a rank set */
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Bool RankSetCheck(RankSet rankSet)
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{
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CHECKL(rankSet < ((ULongest)1 << RankLIMIT));
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UNUSED(rankSet); /* <code/mpm.c#check.unused> */
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return TRUE;
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}
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/* ZoneSetOfRange -- calculate the zone set of a range of addresses */
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RefSet ZoneSetOfRange(Arena arena, Addr base, Addr limit)
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{
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Word zbase, zlimit;
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AVERT(Arena, arena);
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AVER(limit > base);
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/* The base and limit zones of the range are calculated. The limit */
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/* zone is the zone after the last zone of the range, not the zone of */
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/* the limit address. */
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zbase = (Word)base >> arena->zoneShift;
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zlimit = (((Word)limit-1) >> arena->zoneShift) + 1;
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/* If the range is large enough to span all zones, its zone set is */
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/* universal. */
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if (zlimit - zbase >= MPS_WORD_WIDTH)
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return ZoneSetUNIV;
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zbase &= MPS_WORD_WIDTH - 1;
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zlimit &= MPS_WORD_WIDTH - 1;
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/* If the base zone is less than the limit zone, the zone set looks */
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/* like 000111100, otherwise it looks like 111000011. */
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if (zbase < zlimit)
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return ((ZoneSet)1<<zlimit) - ((ZoneSet)1<<zbase);
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else
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return ~(((ZoneSet)1<<zbase) - ((ZoneSet)1<<zlimit));
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}
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/* ZoneSetOfSeg -- calculate the zone set of segment addresses
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*
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* .rsor.def: The zone set of a segment is the union of the zones the
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* segment occupies.
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*/
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ZoneSet ZoneSetOfSeg(Arena arena, Seg seg)
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{
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/* arena is checked by ZoneSetOfRange */
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AVERT(Seg, seg);
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return ZoneSetOfRange(arena, SegBase(seg), SegLimit(seg));
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
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* All rights reserved. This is an open source license. Contact
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* Ravenbrook for commercial licensing options.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Redistributions in any form must be accompanied by information on how
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* to obtain complete source code for this software and any accompanying
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* software that uses this software. The source code must either be
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* included in the distribution or be available for no more than the cost
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* of distribution plus a nominal fee, and must be freely redistributable
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* under reasonable conditions. For an executable file, complete source
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* code means the source code for all modules it contains. It does not
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* include source code for modules or files that typically accompany the
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* major components of the operating system on which the executable file
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* runs.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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