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fix copy_term for attributed variables.

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git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1079 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
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vsc 2004-06-16 14:10:20 +00:00
parent 1e50d32aed
commit ceaa77c6f5
1 changed files with 23 additions and 40 deletions
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63
C/utilpreds.c
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@ -54,6 +54,26 @@ clean_tr(tr_fr_ptr TR0) {
} }
} }
static inline void
clean_dirty_tr(tr_fr_ptr TR0) {
if (TR != TR0) {
tr_fr_ptr pt = TR0;
do {
Term p = TrailTerm(pt++);
if (IsVarTerm(p)) {
RESET_VARIABLE(p);
} else {
TrailTerm(TR0+1) = TrailTerm(pt);
TrailTerm(TR0) = TrailTerm(TR0+2) = p;
pt+=2;
TR0 += 3;
}
} while (pt != TR);
TR = TR0;
}
}
static int static int
copy_complex_term(register CELL *pt0, register CELL *pt0_end, CELL *ptf, CELL *HLow) copy_complex_term(register CELL *pt0, register CELL *pt0_end, CELL *ptf, CELL *HLow)
{ {
@ -201,43 +221,6 @@ copy_complex_term(register CELL *pt0, register CELL *pt0_end, CELL *ptf, CELL *H
} }
to_visit = bp[0]; to_visit = bp[0];
HB = HLow; HB = HLow;
if (CurTR != TR) {
/* Problem here is that the attached routine might
* have changed the list of suspended goals and stored
* new entries in the trail. This should be quite
* rare, so for simplicity we just swap cells from
* bottom and top of Trail, not nice but not worth
* complicating everything else.
*/
CELL *pt1 = (CELL *)TR0;
CELL *pt2 = (CELL *)CurTR;
CELL *pt3 = (CELL *)TR;
if (pt1 == pt2) {
TR0 = TR;
} else {
/* make a backup copy */
while (pt2 < pt3)
*((CELL *)TR)++ = *pt2++;
/* reset pointers */
TR = (tr_fr_ptr)pt3;
pt2 = (CELL *)CurTR;
/* now go to old trail */
pt3 = pt1+(pt2-pt1);
/* copy old trail above */
if (pt3 != pt1) {
while (pt3 < pt2) {
*pt3++ = *pt1++;
}
}
pt1 = (CELL *)TR0;
pt2 = pt1 + (pt3-(CELL *)CurTR);
/* copy new trail below */
while (pt1 < pt2) {
*pt1++ = *pt3++;
}
TR0 = (tr_fr_ptr)pt1;
}
}
ptf++; ptf++;
Bind_Global(ptd0, ptf[-1]); Bind_Global(ptd0, ptf[-1]);
} }
@ -271,7 +254,7 @@ copy_complex_term(register CELL *pt0, register CELL *pt0_end, CELL *ptf, CELL *H
/* restore our nice, friendly, term to its original state */ /* restore our nice, friendly, term to its original state */
HB = HB0; HB = HB0;
clean_tr(TR0); clean_dirty_tr(TR0);
return(0); return(0);
overflow: overflow:
@ -289,7 +272,7 @@ copy_complex_term(register CELL *pt0, register CELL *pt0_end, CELL *ptf, CELL *H
*pt0 = (CELL)to_visit[3]; *pt0 = (CELL)to_visit[3];
} }
#endif #endif
clean_tr(TR0); clean_dirty_tr(TR0);
return(-1); return(-1);
heap_overflow: heap_overflow:
@ -307,7 +290,7 @@ copy_complex_term(register CELL *pt0, register CELL *pt0_end, CELL *ptf, CELL *H
*pt0 = (CELL)to_visit[3]; *pt0 = (CELL)to_visit[3];
} }
#endif #endif
clean_tr(TR0); clean_dirty_tr(TR0);
return(-2); return(-2);
} }