330 lines
6.2 KiB
C
330 lines
6.2 KiB
C
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*************************************************************************
|
|
* *
|
|
* YAP Prolog %W% %G% *
|
|
* Yap Prolog was developed at NCCUP - Universidade do Porto *
|
|
* *
|
|
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
|
|
* *
|
|
**************************************************************************
|
|
* *
|
|
* File: Tags_32Ops.h.m4 *
|
|
* Last rev: December 90 *
|
|
* mods: *
|
|
* comments: Original Tag Scheme for machines with 32 bits adresses *
|
|
* version: $Id: Tags_32Ops.h,v 1.3 2008-01-30 10:35:43 vsc Exp $ *
|
|
*************************************************************************/
|
|
|
|
/*
|
|
|
|
Version for 32 bit addresses machines,
|
|
Each term is represented internally as an unsigned 32 bit integer as
|
|
follows:
|
|
tag value
|
|
ints 1m1....01 numeric value
|
|
atoms 1m0....01 offset of atom entry
|
|
pairs 1mr....11 ptr to pair
|
|
aplied functor 1mr....00 ptr to functor followed by args
|
|
undefined 0mr....00 address of cell pointing to itself
|
|
|
|
functors are represented as ptrs to the functor entry in the atom
|
|
property list
|
|
|
|
This version speeds up access to lists and to compound
|
|
terms by using the XOR and NOT operations to build their tags. This
|
|
saves operations on RISC machines.
|
|
|
|
As a further optimisation, only pairs or compound terms have
|
|
the second lowest bit set. This allows one to recognise lists or
|
|
compound terms with a single operation.
|
|
|
|
The main problem is that the default value of the M and R bits for GC
|
|
are now 1 in compound terms and structures.
|
|
|
|
*/
|
|
|
|
#if SIZEOF_INT_P==4 && !defined(USE_LOW32_TAGS)
|
|
|
|
#define TAGS_FAST_OPS 1
|
|
|
|
#define SHIFT_HIGH_TAG 29
|
|
|
|
#define MKTAG(HI,LO) ((((UInt) (HI))<<SHIFT_HIGH_TAG)|(LO))
|
|
|
|
#define TagBits /* 0xb0000003L */ MKTAG(0x5,3)
|
|
#define LowTagBits /* 0x00000003L */ MKTAG(0x0,3)
|
|
#define LowBit /* 0x00000001L */ MKTAG(0x0,1)
|
|
#define HighTagBits /* 0xf0000000L */ MKTAG(0x7,0)
|
|
#define AdrHiBit /* 0x08000000L */ (((UInt)1) << (SHIFT_HIGH_TAG-1))
|
|
#define MaskAdr /* 0x1ffffffcL */ ((((UInt)1) << (SHIFT_HIGH_TAG))-4)
|
|
#define MaskPrim /* 0x0ffffffcL */ ((((UInt)1) << (SHIFT_HIGH_TAG))-4)
|
|
#define NumberTag /* 0xb0000001L */ MKTAG(0x5,2)
|
|
#define AtomTag /* 0x90000001L */ MKTAG(0x4,2)
|
|
#define MAX_ABS_INT /* 0xfe00000LL */ ((Int)0x04000000L)
|
|
|
|
/* bits that should not be used by anyone but us */
|
|
#define YAP_PROTECTED_MASK 0xe0000000L
|
|
|
|
#define MaskBits 4
|
|
|
|
/*
|
|
UNIQUE_TAG_FOR_PAIR gives the representation for pair an
|
|
unique tag
|
|
|
|
This allows optimisation of switch_list
|
|
|
|
*/
|
|
#if defined(i386) || defined(sparc) || defined(_POWER) || defined(__POWERPC__) || defined(__sparc)
|
|
#define UNIQUE_TAG_FOR_PAIRS 1
|
|
#endif
|
|
|
|
#if UNIQUE_TAG_FOR_PAIRS
|
|
#define PairBit /* 0x00000001L */ 1
|
|
#define ApplBit /* 0x00000000L */ 0
|
|
#else
|
|
#define PairBit /* 0x00000000L */ 0
|
|
#define ApplBit /* 0x00000001L */ 1
|
|
#endif
|
|
|
|
#define TagOf(t) (Unsigned(t)&TagBits)
|
|
#define LowTagOf(t) (Unsigned(t)&TagBits)
|
|
#define NonTagPart(X) (Signed(X) & MaskPrim)
|
|
#define TAGGEDA(TAG,V) (TAG | Unsigned(V))
|
|
#define TAGGED(TAG,V) (TAG | NonTagPart(Unsigned(V)<<2))
|
|
#define NONTAGGED(TAG,V) NonTagPart(Unsigned(V)<<2)
|
|
#define BitOn(Bit,V) (Bit & Unsigned(V))
|
|
#define CHKTAG(t,Tag) ((Unsigned(t)&TagBits)==Tag)
|
|
|
|
/* never forget to surround arguments to a macro by brackets */
|
|
|
|
#include "inline-only.h"
|
|
INLINE_ONLY int IsVarTerm (Term);
|
|
|
|
INLINE_ONLY int
|
|
IsVarTerm (Term t)
|
|
{
|
|
return (int) (Signed (t) >= 0);
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY int IsNonVarTerm (Term);
|
|
|
|
INLINE_ONLY int
|
|
IsNonVarTerm (Term t)
|
|
{
|
|
return (int) (Signed (t) < 0);
|
|
}
|
|
|
|
|
|
#if UNIQUE_TAG_FOR_PAIRS
|
|
|
|
INLINE_ONLY Term *RepPair (Term);
|
|
|
|
INLINE_ONLY Term *
|
|
RepPair (Term t)
|
|
{
|
|
return (Term *) ((~(t)));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Term AbsPair (Term *);
|
|
|
|
INLINE_ONLY Term
|
|
AbsPair (Term * p)
|
|
{
|
|
return (Term) ((~Unsigned (p)));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Int IsPairTerm (Term);
|
|
|
|
INLINE_ONLY Int
|
|
IsPairTerm (Term t)
|
|
{
|
|
return (Int) (((t) & PairBit));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Term *RepAppl (Term);
|
|
|
|
INLINE_ONLY Term *
|
|
RepAppl (Term t)
|
|
{
|
|
return (Term *) ((-Signed (t)));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Term AbsAppl (Term *);
|
|
|
|
INLINE_ONLY Term
|
|
AbsAppl (Term * p)
|
|
{
|
|
return (Term) ((-Signed (p)));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Int IsApplTerm (Term);
|
|
|
|
INLINE_ONLY Int
|
|
IsApplTerm (Term t)
|
|
{
|
|
return (Int) ((!((t) & LowTagBits)));
|
|
}
|
|
|
|
|
|
#else
|
|
|
|
INLINE_ONLY Term *RepPair (Term);
|
|
|
|
INLINE_ONLY Term *
|
|
RepPair (Term t)
|
|
{
|
|
return (Term *) ((-Signed (t)));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Term AbsPair (Term *);
|
|
|
|
INLINE_ONLY Term
|
|
AbsPair (Term * p)
|
|
{
|
|
return (Term) (((CELL) (-Signed (p))));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Int IsPairTerm (Term);
|
|
|
|
INLINE_ONLY Int
|
|
IsPairTerm (Term t)
|
|
{
|
|
return (Int) ((!((t) & LowTagBits)));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Term *RepAppl (Term);
|
|
|
|
INLINE_ONLY Term *
|
|
RepAppl (Term t)
|
|
{
|
|
return (Term *) ((~(t)));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Term AbsAppl (Term *);
|
|
|
|
INLINE_ONLY Term
|
|
AbsAppl (Term * p)
|
|
{
|
|
return (Term) ((~Unsigned (p)));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Int IsApplTerm (Term);
|
|
|
|
INLINE_ONLY Int
|
|
IsApplTerm (Term t)
|
|
{
|
|
return (Int) (((t) & ApplBit));
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
INLINE_ONLY Int IsAtomOrIntTerm (Term);
|
|
|
|
INLINE_ONLY Int
|
|
IsAtomOrIntTerm (Term t)
|
|
{
|
|
return (Int) (((Unsigned (t) & LowTagBits) == 0x2));
|
|
}
|
|
|
|
|
|
|
|
|
|
INLINE_ONLY Int IntOfTerm (Term);
|
|
|
|
INLINE_ONLY Int
|
|
IntOfTerm (Term t)
|
|
{
|
|
return (Int) ((Int) (Unsigned (t) << 3) >> 5);
|
|
}
|
|
|
|
|
|
|
|
#if UNIQUE_TAG_FOR_PAIRS
|
|
|
|
INLINE_ONLY Term AdjustPtr (Term t, Term off);
|
|
|
|
INLINE_ONLY Term
|
|
AdjustPtr (Term t, Term off)
|
|
{
|
|
return (Term) (((IsVarTerm (t)
|
|
|| IsAtomOrIntTerm (t)) ? (t) +
|
|
(off) : (IsPairTerm (t) ? (CELL)
|
|
AbsPair ((CELL *) ((CELL) RepPair (t) +
|
|
(off))) : (t) - (off))));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Term AdjustIDBPtr (Term t, Term off);
|
|
|
|
INLINE_ONLY Term
|
|
AdjustIDBPtr (Term t, Term off)
|
|
{
|
|
return (Term) (IsVarTerm (t) ? (t) + (off) : (t) - (off));
|
|
}
|
|
|
|
|
|
#else
|
|
|
|
INLINE_ONLY Term AdjustPtr (Term t, Term off);
|
|
|
|
INLINE_ONLY Term
|
|
AdjustPtr (Term t, Term off)
|
|
{
|
|
return (Term) (((IsVarTerm (t)
|
|
|| IsAtomOrIntTerm (t)) ? (t) +
|
|
(off) : (IsApplTerm (t) ? (CELL)
|
|
AbsAppl ((CELL *) ((CELL) RepAppl (t) +
|
|
(off))) : (t) - (off))));
|
|
}
|
|
|
|
|
|
|
|
INLINE_ONLY Term AdjustIDBPtr (Term t, Term off);
|
|
|
|
INLINE_ONLY Term
|
|
AdjustIDBPtr (Term t, Term off)
|
|
{
|
|
return (Term) (IsVarTerm (t) ? (t) +
|
|
(off) : (IsApplTerm (t) ? (CELL)
|
|
AbsAppl ((CELL *) ((CELL) RepAppl (t) +
|
|
(off))) : (t) - (off)));
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
#endif /* SIZEOF_INT_P==4 */
|
|
|
|
|
|
|