e5f4633c39
which included commits to RCS files with non-trunk default branches. git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@5 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
92 lines
3.2 KiB
Plaintext
92 lines
3.2 KiB
Plaintext
/*************************************************************************
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* *
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* YAP Prolog %W% %G% *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: Tags_32LowTag.h.m4 *
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* Last rev: December 90 *
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* mods: *
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* comments: Original Tag Scheme for machines with 32 bits adresses *
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* version: $Id: Tags_32LowTag.h.m4,v 1.1.1.1 2001-04-09 19:53:46 vsc Exp $ *
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*************************************************************************/
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#define TAG_LOW_BITS_32 1
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/* Version for 32 bit addresses machines,
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Each term is represented internally as an unsigned 32 bit integer as
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follows:
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tag value
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ints m.....110 numeric value
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atoms m.....010 offset of atom entry
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pairs mr.....11 ptr to pair
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aplied functor mr.....01 ptr to functor followed by args
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ref mr.....00 address of cell
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undefined mr.....00 address of cell pointing to itself
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functors are represented as ptrs to the functor entry in the atom
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property list
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*/
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#define SHIFT_LOW_TAG 2
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#define SHIFT_HIGH_TAG 2
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#define MKTAG(HI,LO) ((((UInt) (HI))<<SHIFT_HIGH_TAG)|(LO))
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#define TagBits /* 0x00000007L */ MKTAG(0x1,3)
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#define LowTagBits /* 0x00000003L */ MKTAG(0x0,3)
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#define LowBit /* 0x00000001L */ MKTAG(0x0,1)
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#define HighTagBits /* 0x0000000cL */ MKTAG(0x1,0)
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#define NumberTag /* 0x0000000dL */ MKTAG(0x1,2)
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#define AtomTag /* 0x00000006L */ MKTAG(0x0,2)
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/*
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subtract the total for tag bits, plus 1 bit for GC, plus another
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for sign
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*/
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#define MAX_ABS_INT ((Int)0x04000000L)
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/*
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UNIQUE_TAG_FOR_PAIR gives the representation for pair an
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unique tag
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This allows optimisation of switch_list
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*/
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#define UNIQUE_TAG_FOR_PAIRS 1
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#define PairBits /* 0x00000003L */ MKTAG(0x0,3)
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#define ApplBit /* 0x00000001L */ MKTAG(0x0,1)
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#define PrimiBits /* 0x00000002L */ MKTAG(0x0,2)
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#define NumberBits /* 0x0000000aL */ MKTAG(0x2,2)
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#define NumberMask /* 0x0000000bL */ MKTAG(0x2,3)
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#define NonTagPart(V) (Unsigned(V)>>(SHIFT_LOW_TAG+SHIFT_HIGH_TAG))
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#define TAGGED(TAG,V) (((Unsigned(V)<<(SHIFT_HIGH_TAG+SHIFT_LOW_TAG+1))>>1)|(TAG))
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#define NONTAGGED(TAG,V) ((Unsigned(V)<<(SHIFT_HIGH_TAG+SHIFT_LOW_TAG+1))>>1)
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#define TAGGEDA(TAG,V) ((Unsigned(V) << (SHIFT_HIGH_TAG+SHIFT_LOW_TAG))|(TAG))
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#define CHKTAG(t,Tag) ((Unsigned(t)&TagBits)==Tag)
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/* bits that should not be used by anyone but us */
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#define YAP_PROTECTED_MASK 0xc0000000L
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Inline(IsVarTerm, int, Term, t, !((t) & LowTagBits))
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Inline(IsNonVarTerm, int, Term, t, ((t) & LowTagBits))
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Inline(RepPair, Term *, Term, t, (t)-PairBits)
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Inline(AbsPair, Term, Term *, p, Unsigned(p)+PairBits)
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Inline(IsPairTerm, Int, Term, t, (((t) & LowTagBits) == PairBits))
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Inline(RepAppl, Term *, Term, t, ((t)-ApplBit))
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Inline(AbsAppl, Term, Term *, p, Unsigned(p)+ApplBit)
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Inline(IsApplTerm, Int, Term, t, (((t) & LowTagBits) == ApplBit))
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Inline(IsAtomOrIntTerm, Int, Term, t, (((t) & LowTagBits) == 2))
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Inline2(AdjustPtr, Term, Term, t, Term, off, (t)+off)
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Inline2(AdjustIDBPtr, Term, Term, t, Term, off, (t)+off)
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Inline(IntOfTerm, Int, Term, t, ((Int)(t << 1))>>(SHIFT_LOW_TAG+SHIFT_HIGH_TAG+1))
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