183 lines
4.0 KiB
C
183 lines
4.0 KiB
C
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/*************************************************************************
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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_32bits.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_32bits.h,v 1.9 2002-06-01 04:29:01 vsc Exp $ *
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*************************************************************************/
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/* Original 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 1m1....00 numeric value
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atoms 1m0....00 offset of atom entry
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pairs 1mr....01 ptr to pair
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aplied functor 1mr....10 ptr to functor followed by args
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ref 0mr....00 address of cell
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undefined 0mr....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_HIGH_TAG 29
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#define MKTAG(HI,LO) ((((UInt) (HI))<<SHIFT_HIGH_TAG)|(LO))
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#define TagBits /* 0xe0000003L */ MKTAG(0x7,3)
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#define LowTagBits /* 0x00000003L */ MKTAG(0x0,3)
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#define HighTagBits /* 0xe0000000L */ MKTAG(0x7,0)
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#define AdrHiBit /* 0x10000000L */ (((UInt)1) << (SHIFT_HIGH_TAG-1))
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#define MaskAdr /* 0x1ffffffcL */ ((((UInt)1) << SHIFT_HIGH_TAG)-4)
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#define MaskPrim /* 0x0ffffffcL */ ((((UInt)1) << (SHIFT_HIGH_TAG))-4)
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#define NumberTag /* 0xa0000000L */ MKTAG(0x5,0)
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#define AtomTag /* 0x80000000L */ MKTAG(0x4,0)
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#define PairTag /* 0x80000001L */ MKTAG(0x4,1)
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#define ApplTag /* 0x80000002L */ MKTAG(0x4,2)
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#define MAX_ABS_INT /* 0x04000000L */ (1 << (SHIFT_HIGH_TAG-3))
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/* bits that should not be used by anyone but us */
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#define YAP_PROTECTED_MASK 0xe0000000L
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#define MaskBits 4
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#define PairBit /* 0x00000001L */ 1
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#define ApplBit /* 0x00000002L */ 2
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#define NonTagPart(X) (Signed(X) & MaskPrim)
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#define TAGGEDA(TAG,V) (TAG | Unsigned(V))
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#define TAGGED(TAG,V) (TAG | NonTagPart(Unsigned(V)<<2))
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#define NONTAGGED(TAG,V) NonTagPart(Unsigned(V)<<2)
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#define BitOn(Bit,V) (Bit & Unsigned(V))
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#define CHKTAG(t,Tag) ((Unsigned(t)&TagBits)==Tag)
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inline EXTERN int IsVarTerm(Term);
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inline EXTERN int IsVarTerm(Term t)
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{
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return (int) (Signed(t) >= 0);
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}
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inline EXTERN int IsNonVarTerm(Term);
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inline EXTERN int IsNonVarTerm(Term t)
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{
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return (int) (Signed(t) < 0);
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}
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inline EXTERN Term * RepPair(Term);
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inline EXTERN Term * RepPair(Term t)
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{
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return (Term *) (NonTagPart(t));
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}
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inline EXTERN Term AbsPair(Term *);
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inline EXTERN Term AbsPair(Term * p)
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{
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return (Term) (TAGGEDA(PairTag, (p)));
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}
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inline EXTERN Int IsPairTerm(Term);
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inline EXTERN Int IsPairTerm(Term t)
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{
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return (Int) (BitOn(PairBit, (t)));
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}
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inline EXTERN Term * RepAppl(Term);
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inline EXTERN Term * RepAppl(Term t)
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{
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return (Term *) (NonTagPart(t));
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}
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inline EXTERN Term AbsAppl(Term *);
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inline EXTERN Term AbsAppl(Term * p)
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{
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return (Term) (TAGGEDA(ApplTag, (p)));
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}
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inline EXTERN Int IsApplTerm(Term);
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inline EXTERN Int IsApplTerm(Term t)
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{
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return (Int) (BitOn(ApplBit, (t)));
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}
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inline EXTERN int IsAtomOrIntTerm(Term);
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inline EXTERN int IsAtomOrIntTerm(Term t)
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{
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return (int) (((Unsigned(t) & LowTagBits) == 0));
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}
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inline EXTERN Term AdjustPtr(Term t, Term off);
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inline EXTERN Term AdjustPtr(Term t, Term off)
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{
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return (Term) ((t)+off);
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}
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inline EXTERN Term AdjustIDBPtr(Term t, Term off);
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inline EXTERN Term AdjustIDBPtr(Term t, Term off)
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{
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return (Term) ((t)+off);
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}
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inline EXTERN Int IntOfTerm(Term);
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inline EXTERN Int IntOfTerm(Term t)
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{
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return (Int) (((Int)(t << 3))>>(3+2));
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}
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