2dfdca263d
don't use TR directly in scanner/parser, this avoids trouble with ^C while consulting large files. pass gcc -mno-cygwin to library compilation in cygwin environment (cygwin should compile out of the box now). git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1168 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
467 lines
13 KiB
C
467 lines
13 KiB
C
/*************************************************************************
|
|
* *
|
|
* YAP Prolog *
|
|
* *
|
|
* Yap Prolog was developed at NCCUP - Universidade do Porto *
|
|
* *
|
|
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
|
|
* *
|
|
**************************************************************************
|
|
* *
|
|
* File: amiops.h *
|
|
* Last rev: *
|
|
* mods: *
|
|
* comments: Basic abstract machine operations, such as *
|
|
* dereferencing, binding, trailing, and unification. *
|
|
* *
|
|
*************************************************************************/
|
|
#ifdef SCCS
|
|
static char SccsId[] = "%W% %G%";
|
|
#endif /* SCCS */
|
|
|
|
#define IsArrayReference(a) ((a)->array_access_func == FunctorArrayAccess)
|
|
|
|
|
|
/* dereferencing macros */
|
|
|
|
/************************************************************
|
|
|
|
Dereferencing macros
|
|
|
|
*************************************************************/
|
|
|
|
/* For DEREFD, D has both the input and the exit argument */
|
|
/* A is only used locally */
|
|
|
|
#define deref_head(D,Label) if (IsVarTerm(D)) goto Label
|
|
|
|
#define deref_body(D,A,LabelUnk,LabelNonVar) \
|
|
do { \
|
|
if(!IsVarTerm(D)) goto LabelNonVar; \
|
|
LabelUnk: \
|
|
(A) = (CELL *)(D); \
|
|
(D) = *(CELL *)(D); \
|
|
} while (Unsigned(A) != (D))
|
|
|
|
#define derefa_body(D,A,LabelUnk,LabelNonVar) \
|
|
do { \
|
|
(A) = (CELL *)(D); \
|
|
(D) = *(CELL *)(D); \
|
|
if(!IsVarTerm(D)) goto LabelNonVar; \
|
|
LabelUnk: ; \
|
|
} while (Unsigned(A) != (D))
|
|
|
|
#if UNIQUE_TAG_FOR_PAIRS
|
|
|
|
/* If you have an unique tag for pairs you can use these macros which will
|
|
speed up detection of dereferenced pairs, but will be slow
|
|
for the other cases.
|
|
|
|
The only instruction where this seems useful is
|
|
switch_list_nl
|
|
*/
|
|
|
|
#define deref_list_head(D,Label) if (!IsPairTerm(D)) goto Label
|
|
|
|
#define deref_list_body(D,A,LabelList,LabelNonVar) \
|
|
do { \
|
|
if (!IsVarTerm(D)) goto LabelNonVar; \
|
|
(A) = (CELL *)(D); \
|
|
(D) = *(A); \
|
|
if (Unsigned(A) == (D)) break; \
|
|
if (IsPairTerm(D)) goto LabelList; \
|
|
} while (TRUE);
|
|
|
|
#endif /* UNIQUE_TAG_FOR_PAIRS */
|
|
|
|
EXTERN Term STD_PROTO(Deref,(Term));
|
|
EXTERN Term STD_PROTO(Derefa,(CELL *));
|
|
|
|
EXTERN inline Term Deref(Term a)
|
|
{
|
|
while(IsVarTerm(a)) {
|
|
Term *b = (Term *) a;
|
|
a = *b;
|
|
if(a==((Term) b)) return a;
|
|
}
|
|
return(a);
|
|
}
|
|
|
|
EXTERN inline Term
|
|
Derefa(CELL *b)
|
|
{
|
|
Term a = *b;
|
|
restart:
|
|
if (!IsVarTerm(a)) {
|
|
return(a);
|
|
} else if (a == (CELL)b) {
|
|
return(a);
|
|
} else {
|
|
b = (CELL *)a;
|
|
a = *b;
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
/************************************************************
|
|
|
|
TRAIL VARIABLE
|
|
|
|
A contains the address of the variable that is to be trailed
|
|
|
|
*************************************************************/
|
|
|
|
|
|
#define RESET_VARIABLE(V) (*(CELL *)(V) = Unsigned(V))
|
|
|
|
#if SIZEOF_DOUBLE == 2*SIZEOF_LONG_INT
|
|
|
|
EXTERN inline void
|
|
AlignGlobalForDouble(void)
|
|
{
|
|
/* Force Alignment for floats. Note that garbage collector may
|
|
break the alignment; */
|
|
if (!DOUBLE_ALIGNED(H)) {
|
|
RESET_VARIABLE(H);
|
|
H++;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef TABLING
|
|
|
|
#define DO_TRAIL(TERM, VAL) \
|
|
{ \
|
|
register tr_fr_ptr r; \
|
|
r = TR; \
|
|
TR = r + 1; \
|
|
TrailTerm(r) = (CELL) (TERM); \
|
|
TrailVal(r) = (VAL); \
|
|
}
|
|
|
|
#ifdef BFZ_TRAIL_SCHEME
|
|
|
|
#define TRAIL(TERM, VAL) \
|
|
if (OUTSIDE(HBREG,TERM,B) || \
|
|
((TERM) > (CELL *)B_FZ)) \
|
|
DO_TRAIL(TERM, VAL)
|
|
|
|
#define TRAIL_LOCAL(TERM, VAL) \
|
|
if ((TERM) > (CELL *)B || (TERM) > (CELL *)B_FZ) \
|
|
DO_TRAIL(TERM, VAL)
|
|
|
|
#ifdef TERM_EXTENSIONS
|
|
|
|
#define Trail(TERM, VAL, LAB) \
|
|
if (IN_BETWEEN(HBREG,TERM,B) && \
|
|
((TERM) < (CELL *)B_FZ)) \
|
|
goto LAB
|
|
|
|
#else
|
|
#define Trail(TERM, VAL, LAB) \
|
|
TRAIL(TERM, VAL)
|
|
#endif
|
|
|
|
#else /* BBREG_TRAIL_SCHEME */
|
|
|
|
#define TRAIL(TERM, VAL) \
|
|
if (OUTSIDE(HBREG,TERM,BBREG)) \
|
|
DO_TRAIL(TERM, VAL)
|
|
|
|
#ifdef TERM_EXTENSIONS
|
|
#define Trail(TERM, VAL, LAB) \
|
|
if (IN_BETWEEN(HBREG,TERM,BBREG)) \
|
|
goto LAB
|
|
#else
|
|
#define Trail(TERM, VAL, LAB) \
|
|
TRAIL(TERM, VAL)
|
|
#endif
|
|
|
|
#define TRAIL_LOCAL(TERM, VAL) \
|
|
if ((TERM) > (CELL *)BBREG) DO_TRAIL(TERM, VAL)
|
|
|
|
#endif /* TRAIL_SCHEME */
|
|
|
|
/* ------------------------------------------------------ */
|
|
|
|
#define TRAIL_GLOBAL(TERM, VAL) \
|
|
if ((TERM) < HBREG) DO_TRAIL(TERM, VAL)
|
|
|
|
#ifdef TERM_EXTENSIONS
|
|
#define Trail_Global(TERM, VAL, LAB) \
|
|
if ((TERM) >= HBREG) goto LAB
|
|
#else
|
|
#define Trail_Global(TERM, VAL, LAB) \
|
|
TRAIL_GLOBAL(TERM, VAL)
|
|
#endif
|
|
|
|
#define DO_MATRAIL(TERM, OLDVAL, NEWVAL) \
|
|
{ \
|
|
register tr_fr_ptr r = TR; \
|
|
TR = r + 2; \
|
|
TrailVal(r) = (OLDVAL); \
|
|
TrailTerm(r) = TrailTerm(r+1) = AbsAppl((CELL *)(TERM)); \
|
|
TrailVal(r+1) = (NEWVAL); \
|
|
}
|
|
|
|
#define MATRAIL(TERM, OVAL, VAL) \
|
|
if (OUTSIDE(HBREG,TERM,B)) \
|
|
DO_MATRAIL(TERM, OVAL, VAL)
|
|
|
|
#else /* TABLING */
|
|
|
|
#if defined(i386) && !defined(TERM_EXTENSIONS)
|
|
|
|
#define DO_TRAIL(A,D) \
|
|
{ \
|
|
register tr_fr_ptr r; \
|
|
r = TR; \
|
|
TR = r+1; \
|
|
TrailTerm(r) = (CELL)(A); \
|
|
}
|
|
|
|
#define TRAIL(A,D) if (OUTSIDE(HBREG,A,B)) \
|
|
DO_TRAIL(A,D);
|
|
|
|
#define Trail(A, D, LAB) TRAIL(A,D)
|
|
|
|
#define TRAIL_GLOBAL(A,D) if ((A) < HBREG) DO_TRAIL(A,D);
|
|
|
|
#define Trail_Global(A,D,LAB) if ((A) < HBREG) DO_TRAIL(A,D);
|
|
|
|
#define TRAIL_LOCAL(A,D) if ((A) > (CELL *)B) DO_TRAIL(A,D);
|
|
|
|
|
|
#elif __alpha && !defined(TERM_EXTENSIONS)
|
|
|
|
/* alpha machines have a move conditional instruction, which avoids a
|
|
branch when jumping */
|
|
#define TRAIL(A,D) TrailTerm(TR) = (CELL)(A); \
|
|
if (OUTSIDE(HBREG,A,B)) \
|
|
TR++
|
|
|
|
#define Trail(A,D,LAB) TRAIL(A,D)
|
|
|
|
#define TRAIL_GLOBAL(A,D) TR[0] = (CELL)(A); if ((A) < HBREG) TR++
|
|
|
|
#define Trail_Global(A,D,LAB) TRAIL_GLOBAL(A,D)
|
|
|
|
#define TRAIL_LOCAL(A,D) TR[0] = (CELL)(A); if ((A) > ((CELL *)(B))) TR++
|
|
|
|
#elif !defined(TERM_EXTENSIONS)
|
|
|
|
#define DO_TRAIL(A,D) TrailTerm(TR++) = (CELL)(A)
|
|
|
|
#define TRAIL(A,D) if (OUTSIDE(HBREG,A,B)) \
|
|
DO_TRAIL(A,D)
|
|
|
|
#define Trail(A,D,LAB) TRAIL(A,D)
|
|
|
|
#define TRAIL_GLOBAL(A,D) if ((A) < HBREG) DO_TRAIL(A,D)
|
|
|
|
#define Trail_Global(A,D,LAB) TRAIL_GLOBAL(A,D)
|
|
|
|
#define Trail_Global2(A,D,LAB) TRAIL_GLOBAL(A,D)
|
|
|
|
#define TRAIL_LOCAL(A,D) if ((A) > ((CELL *)B)) DO_TRAIL(A,D)
|
|
|
|
#else
|
|
|
|
#define DO_TRAIL(A,D) TrailTerm(TR++) = (CELL)(A)
|
|
|
|
#define TRAIL(A,D) if (OUTSIDE(HBREG,A,B)) \
|
|
DO_TRAIL(A,D)
|
|
|
|
#define Trail(A,D,LAB) if (IN_BETWEEN(HBREG,A,B)) \
|
|
goto LAB
|
|
|
|
#define TRAIL_GLOBAL(A,D) if ((A) < HBREG) DO_TRAIL(A,D)
|
|
|
|
#define Trail_Global(A,D,LAB) if ((A) >= HBREG) goto LAB
|
|
|
|
#define Trail_Global2(A,D,LAB) if ((A) < HBREG) goto LAB
|
|
|
|
#define TRAIL_LOCAL(A,D) if ((A) > ((CELL *)B)) DO_TRAIL(A,D)
|
|
|
|
#endif
|
|
|
|
/************************************************************
|
|
|
|
Binding Macros for Multiple Assignment Variables.
|
|
|
|
************************************************************/
|
|
|
|
#define DO_MATRAIL(VP, OLDV, D) \
|
|
{ TrailTerm(TR+1) = OLDV; \
|
|
TrailTerm(TR) = TrailTerm(TR+2) = AbsAppl(VP); \
|
|
TR += 3; \
|
|
}
|
|
|
|
#define MATRAIL(VP,OLDV,D) if (OUTSIDE(HBREG,VP,B)) \
|
|
DO_MATRAIL(VP, OLDV, D)
|
|
|
|
#endif /* TABLING */
|
|
|
|
|
|
#define REF_TO_TRENTRY(REF) AbsPair(((CELL *)&((REF)->Flags)))
|
|
#define CLREF_TO_TRENTRY(REF) AbsPair(((CELL *)&((REF)->ClFlags)))
|
|
|
|
#define TRAIL_REF(REF) TrailTerm(TR++) = REF_TO_TRENTRY(REF)
|
|
#define TRAIL_CLREF(REF) TrailTerm(TR++) = CLREF_TO_TRENTRY(REF)
|
|
#define TRAIL_LINK(REF) TrailTerm(TR++) = AbsPair((CELL *)(REF))
|
|
|
|
#define Bind(A,D) TRAIL(A,D); *(A) = (D)
|
|
|
|
#define Bind_Global(A,D) TRAIL_GLOBAL(A,D); *(A) = (D)
|
|
|
|
#define BIND(A,D,L) *(A) = (D); Trail(A,D,L)
|
|
|
|
#define BIND_GLOBAL(A,D,L) *(A) = (D); Trail_Global(A,D,L)
|
|
|
|
#ifdef COROUTINING
|
|
#define BIND_GLOBAL2(A,D,LAB,LAB1) *(A) = (D); if ((A) < HBREG) goto LAB; goto LAB1
|
|
|
|
#define BIND_GLOBALCELL(A,D) *(A) = (D); \
|
|
if ((A) >= HBREG) continue; \
|
|
TRAIL_GLOBAL(A,D); if ((A) >= H0) continue; \
|
|
Yap_WakeUp((A)); continue
|
|
#else
|
|
#define BIND_GLOBAL2(A,D,LAB,LAB1) BIND_GLOBAL(A,D,LAB)
|
|
|
|
#define BIND_GLOBALCELL(A,D) BIND_GLOBAL(A,D,L); continue
|
|
#endif
|
|
|
|
#define Bind_Local(A,D) { TRAIL_LOCAL(A,D); *(A) = (D); }
|
|
|
|
|
|
#define MaBind(VP,D) { MATRAIL((VP),*(VP),(D)); *(VP) = (D); }
|
|
|
|
#if defined(__GNUC__) && defined(i386) && !defined(TERM_EXTENSIONS) && !defined(TABLING)
|
|
/* destroy d0 and pt0 */
|
|
#define DBIND(A,D,L) \
|
|
{ register CELL *t1=HBREG; \
|
|
__asm__("movl %4,(%0)\n\t" \
|
|
"movl %2,%4\n\t" \
|
|
"subl %1,%2\n\t" \
|
|
"subl %0,%4\n\t" \
|
|
"cmpl %2,%4\n\t" \
|
|
"jae 1f\n\t" \
|
|
"movl %3,%4\n\t" \
|
|
"movl %0,(%4)\n\t" \
|
|
"addl $4,%4\n\t" \
|
|
"movl %4,%3\n\t" \
|
|
"1:" \
|
|
: /* no outputs */ \
|
|
: "r" (A), "m" (B), "r" (t1), "m" (TR), "r" (D) ); \
|
|
}
|
|
|
|
#else
|
|
#define DBIND(A,D,L) BIND(A,D,L)
|
|
#endif
|
|
|
|
|
|
/************************************************************
|
|
|
|
Unification Routines
|
|
|
|
*************************************************************/
|
|
|
|
EXTERN Int STD_PROTO(Yap_unify,(Term,Term));
|
|
|
|
inline EXTERN void STD_PROTO(reset_trail,(tr_fr_ptr));
|
|
|
|
inline EXTERN void
|
|
reset_trail(tr_fr_ptr TR0) {
|
|
while(TR != TR0) {
|
|
CELL d1;
|
|
--TR;
|
|
d1 = TrailTerm(TR);
|
|
#ifdef MULTI_ASSIGNMENT_VARIABLES
|
|
if (IsVarTerm(d1)) {
|
|
#endif
|
|
CELL *pt = (CELL *)d1;
|
|
RESET_VARIABLE(pt);
|
|
#ifdef MULTI_ASSIGNMENT_VARIABLES
|
|
} else {
|
|
CELL *pt = RepAppl(d1);
|
|
/* AbsAppl means */
|
|
/* multi-assignment variable */
|
|
/* so the next cell is the old value */
|
|
#if FROZEN_STACKS
|
|
pt[0] = TrailVal(TR-1);
|
|
#else
|
|
pt[0] = TrailTerm(TR-1);
|
|
#endif /* FROZEN_STACKS */
|
|
TR -= 2;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
EXTERN inline
|
|
Int Yap_unify(Term t0, Term t1)
|
|
{
|
|
tr_fr_ptr TR0 = TR;
|
|
|
|
if (Yap_IUnify(t0,t1)) {
|
|
return TRUE;
|
|
} else {
|
|
reset_trail(TR0);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
EXTERN Int STD_PROTO(Yap_unify_constant,(Term,Term));
|
|
|
|
EXTERN inline Int
|
|
Yap_unify_constant(register Term a, register Term cons)
|
|
{
|
|
CELL *pt;
|
|
deref_head(a,unify_cons_unk);
|
|
unify_cons_nonvar:
|
|
{
|
|
if (a == cons) return(TRUE);
|
|
else if (IsApplTerm(a)) {
|
|
Functor f;
|
|
if (!IsApplTerm(cons))
|
|
return(FALSE);
|
|
f = FunctorOfTerm(a);
|
|
if (f != FunctorOfTerm(cons))
|
|
return(FALSE);
|
|
if (IsExtensionFunctor(f)) {
|
|
switch((CELL)f) {
|
|
case (CELL)FunctorDBRef:
|
|
return(a == cons);
|
|
case (CELL)FunctorLongInt:
|
|
return(RepAppl(a)[1] == RepAppl(cons)[1]);
|
|
case (CELL)FunctorDouble:
|
|
return(FloatOfTerm(a) == FloatOfTerm(cons));
|
|
#ifdef USE_GMP
|
|
case (CELL)FunctorBigInt:
|
|
return(mpz_cmp(Yap_BigIntOfTerm(a),Yap_BigIntOfTerm(cons)) == 0);
|
|
#endif /* USE_GMP */
|
|
default:
|
|
return(FALSE);
|
|
}
|
|
}
|
|
} else return(FALSE);
|
|
}
|
|
|
|
|
|
deref_body(a,pt,unify_cons_unk,unify_cons_nonvar);
|
|
BIND(pt,cons,wake_for_cons);
|
|
#ifdef COROUTINING
|
|
DO_TRAIL(pt, cons);
|
|
if (pt < H0) Yap_WakeUp(pt);
|
|
wake_for_cons:
|
|
#endif
|
|
return(TRUE);
|
|
}
|
|
|
|
|
|
#define EQ_OK_IN_CMP 1
|
|
#define LT_OK_IN_CMP 2
|
|
#define GT_OK_IN_CMP 4
|
|
|