1381 lines
41 KiB
C
1381 lines
41 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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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: utilpreds.c * Last rev: 4/03/88
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** mods: * comments: new utility predicates for YAP *
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* *
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*************************************************************************/
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/**
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* @file C/terms.c
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*
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* @brief applications of the tree walker pattern.
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*
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* @addtogroup Terms
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*
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* @{
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*
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*/
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#include "absmi.h"
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#include "YapHeap.h"
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#include "attvar.h"
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#include "yapio.h"
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#ifdef HAVE_STRING_H
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#include "string.h"
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#endif
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static int expand_vts(int args USES_REGS) {
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UInt expand = LOCAL_Error_Size;
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yap_error_number yap_errno = LOCAL_Error_TYPE;
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LOCAL_Error_Size = 0;
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LOCAL_Error_TYPE = YAP_NO_ERROR;
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if (yap_errno == RESOURCE_ERROR_TRAIL) {
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/* Trail overflow */
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if (!Yap_growtrail(expand, false)) {
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return false;
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}
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} else if (yap_errno == RESOURCE_ERROR_AUXILIARY_STACK) {
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/* Aux space overflow */
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if (expand > 4 * 1024 * 1024)
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expand = 4 * 1024 * 1024;
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if (!Yap_ExpandPreAllocCodeSpace(expand, NULL, true)) {
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return false;
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}
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} else {
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if (!Yap_gcl(expand, 3, ENV, gc_P(P, CP))) {
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Yap_Error(RESOURCE_ERROR_STACK, TermNil, "in term_variables");
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return false;
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}
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}
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return true;
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}
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static inline void clean_tr(tr_fr_ptr TR0 USES_REGS) {
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if (TR != TR0) {
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do {
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Term p = TrailTerm(--TR);
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RESET_VARIABLE(p);
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} while (TR != TR0);
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}
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}
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static inline void clean_dirty_tr(tr_fr_ptr TR0 USES_REGS) {
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tr_fr_ptr pt0 = TR;
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while (pt0 != TR0) {
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Term p = TrailTerm(--pt0);
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if (IsApplTerm(p)) {
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CELL *pt = RepAppl(p);
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#ifdef FROZEN_STACKS
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pt[0] = TrailVal(pt0);
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#else
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pt[0] = TrailTerm(pt0 - 1);
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pt0--;
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#endif /* FROZEN_STACKS */
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} else {
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RESET_VARIABLE(p);
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}
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}
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TR = TR0;
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}
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/// @brief recover original term while fixing direct refs.
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///
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/// @param USES_REGS
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///
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static inline void clean_complex_tr(tr_fr_ptr TR0 USES_REGS) {
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tr_fr_ptr pt0 = TR;
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while (pt0 != TR0) {
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Term p = TrailTerm(--pt0);
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if (IsApplTerm(p)) {
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/// pt: points to the address of the new term we may want to fix.
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CELL *pt = RepAppl(p);
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if (pt >= HB && pt < HR) { /// is it new?
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Term v = pt[0];
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if (IsApplTerm(v)) {
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/// yes, more than a single ref
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*pt = (CELL)RepAppl(v);
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}
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#ifndef FROZEN_STACKS
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pt0--;
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#endif /* FROZEN_STACKS */
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continue;
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}
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#ifdef FROZEN_STACKS
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pt[0] = TrailVal(pt0);
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#else
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pt[0] = TrailTerm(pt0 - 1);
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pt0--;
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#endif /* FROZEN_STACKS */
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} else {
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RESET_VARIABLE(p);
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}
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}
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TR = TR0;
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}
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typedef struct {
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Term old_var;
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Term new_var;
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} * vcell;
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typedef struct non_single_struct_t {
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CELL *ptd0;
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CELL d0;
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CELL *pt0, *pt0_end;
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} non_singletons_t;
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#define WALK_COMPLEX_TERM__(LIST0, STRUCT0, PRIMI0) \
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int lvl = push_text_stack(); \
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\
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struct non_single_struct_t *to_visit = Malloc( \
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1024 * sizeof(struct non_single_struct_t)), \
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*to_visit0 = to_visit, \
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*to_visit_max = to_visit + 1024; \
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\
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restart: \
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if (pt0 < pt0_end) { \
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register CELL d0; \
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register CELL *ptd0; \
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++pt0; \
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ptd0 = pt0; \
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d0 = *ptd0; \
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list_loop: \
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deref_head(d0, var_in_term_unk); \
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var_in_term_nvar : { \
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if (IsPairTerm(d0)) { \
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if (to_visit + 32 >= to_visit_max) { \
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goto aux_overflow; \
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} \
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LIST0; \
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ptd0 = RepPair(d0); \
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if (*ptd0 == TermFreeTerm) \
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goto restart; \
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to_visit->pt0 = pt0; \
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to_visit->pt0_end = pt0_end; \
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to_visit->ptd0 = ptd0; \
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to_visit->d0 = *ptd0; \
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to_visit++; \
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d0 = ptd0[0]; \
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pt0 = ptd0; \
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*ptd0 = TermFreeTerm; \
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pt0_end = pt0 + 1; \
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if (pt0 <= pt0_end) \
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goto list_loop; \
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} else if (IsApplTerm(d0)) { \
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register Functor f; \
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register CELL *ap2; \
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/* store the terms to visit */ \
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ap2 = RepAppl(d0); \
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f = (Functor)(*ap2); \
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\
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if (IsExtensionFunctor(f) || IsAtomTerm((CELL)f)) { \
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\
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goto restart; \
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} \
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STRUCT0; \
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if (to_visit + 32 >= to_visit_max) { \
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goto aux_overflow; \
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} \
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to_visit->pt0 = pt0; \
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to_visit->pt0_end = pt0_end; \
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to_visit->ptd0 = ap2; \
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to_visit->d0 = (CELL)f; \
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to_visit++; \
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\
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*ap2 = TermNil; \
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d0 = ArityOfFunctor(f); \
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pt0 = ap2; \
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pt0_end = ap2 + d0; \
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goto restart;\
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} else { \
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PRIMI0; \
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goto restart; } \
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} \
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derefa_body(d0, ptd0, var_in_term_unk, var_in_term_nvar);
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#define WALK_COMPLEX_TERM() WALK_COMPLEX_TERM__({}, {}, {})
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#define END_WALK() \
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}
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#define def_aux_overflow() \
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aux_overflow : { \
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size_t d1 = to_visit - to_visit0; \
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size_t d2 = to_visit_max - to_visit0; \
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to_visit0 = \
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Realloc(to_visit0, (d2 + 128) * sizeof(struct non_single_struct_t)); \
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to_visit = to_visit0 + d1; \
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to_visit_max = to_visit0 + (d2 + 128); \
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pt0--; \
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} \
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goto restart;
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#define def_trail_overflow() \
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trail_overflow : { \
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while (to_visit > to_visit0) { \
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to_visit--; \
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CELL *ptd0 = to_visit->ptd0; \
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*ptd0 = to_visit->d0; \
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} \
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pop_text_stack(lvl); \
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LOCAL_Error_TYPE = RESOURCE_ERROR_TRAIL; \
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LOCAL_Error_Size = (TR - TR0) * sizeof(tr_fr_ptr *); \
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clean_tr(TR0 PASS_REGS); \
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HR = InitialH; \
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return 0L; \
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}
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#define def_global_overflow() \
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global_overflow : { \
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while (to_visit > to_visit0) { \
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to_visit--; \
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CELL *ptd0 = to_visit->ptd0; \
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*ptd0 = to_visit->d0; \
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} \
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pop_text_stack(lvl); \
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clean_tr(TR0 PASS_REGS); \
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HR = InitialH; \
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LOCAL_Error_TYPE = RESOURCE_ERROR_STACK; \
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LOCAL_Error_Size = (ASP - HR) * sizeof(CELL); \
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return false; \
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}
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static Int var_in_complex_term(register CELL *pt0, register CELL *pt0_end,
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Term v USES_REGS) {
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WALK_COMPLEX_TERM();
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if ((CELL)d0 == v) { /* we found it */
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/* Do we still have compound terms to visit */
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while (to_visit > to_visit0) {
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to_visit--;
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CELL *ptd0 = to_visit->ptd0;
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*ptd0 = to_visit->d0;
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}
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pop_text_stack(lvl);
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return true;
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}
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END_WALK();
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if (to_visit > to_visit0) {
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to_visit--;
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CELL *ptd0 = to_visit->ptd0;
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*ptd0 = to_visit->d0;
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pt0 = to_visit->pt0;
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pt0_end = to_visit->pt0_end;
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}
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pop_text_stack(lvl);
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return false;
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def_aux_overflow();
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}
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static Int var_in_term(Term v,
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Term t USES_REGS) /* variables in term t */
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{
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must_be_variable(v);
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t = Deref(t);
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if (IsVarTerm(t)) {
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return (v == t);
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} else if (IsPrimitiveTerm(t)) {
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return (false);
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}
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return (var_in_complex_term(&(t)-1, &(t), v PASS_REGS));
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}
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/** @pred variable_in_term(? _Term_,? _Var_)
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Succeed if the second argument _Var_ is a variable and occurs in
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term _Term_.
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*/
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static Int variable_in_term(USES_REGS1) {
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return var_in_term(Deref(ARG2), Deref(ARG1) PASS_REGS);
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}
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/**
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@brief routine to locate all variables in a term, and its applications */
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static Term vars_in_complex_term(register CELL *pt0, register CELL *pt0_end,
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Term inp USES_REGS) {
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register tr_fr_ptr TR0 = TR;
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CELL *InitialH = HR;
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CELL output = AbsPair(HR);
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WALK_COMPLEX_TERM();
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/* do or pt2 are unbound */
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*ptd0 = TermNil;
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/* leave an empty slot to fill in later */
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if (HR + 1024 > ASP) {
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goto global_overflow;
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}
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HR[1] = AbsPair(HR + 2);
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HR += 2;
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HR[-2] = (CELL)ptd0;
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/* next make sure noone will see this as a variable again */
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if (TR > (tr_fr_ptr)LOCAL_TrailTop - 256) {
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/* Trail overflow */
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if (!Yap_growtrail((TR - TR0) * sizeof(tr_fr_ptr *), true)) {
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goto trail_overflow;
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}
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}
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TrailTerm(TR++) = (CELL)ptd0;
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END_WALK();
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/* Do we still have compound terms to visit */
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if (to_visit > to_visit0) {
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to_visit--;
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pt0 = to_visit->pt0;
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pt0_end = to_visit->pt0_end;
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CELL *ptd0 = to_visit->ptd0;
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*ptd0 = to_visit->d0;
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goto restart;
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}
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clean_tr(TR0 PASS_REGS);
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pop_text_stack(lvl);
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if (HR != InitialH) {
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/* close the list */
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Term t2 = Deref(inp);
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if (IsVarTerm(t2)) {
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RESET_VARIABLE(HR - 1);
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Yap_unify((CELL)(HR - 1), inp);
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} else {
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HR[-1] = t2; /* don't need to trail */
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}
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return (output);
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} else {
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return (inp);
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}
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def_trail_overflow();
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def_aux_overflow();
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def_global_overflow();
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}
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static Int
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p_variables_in_term(USES_REGS1) /* variables in term t */
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{
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Term out, inp;
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int count;
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restart:
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count = 0;
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inp = Deref(ARG2);
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while (!IsVarTerm(inp) && IsPairTerm(inp)) {
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Term t = HeadOfTerm(inp);
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if (IsVarTerm(t)) {
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CELL *ptr = VarOfTerm(t);
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*ptr = TermFoundVar;
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TrailTerm(TR++) = t;
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count++;
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if (TR > (tr_fr_ptr)LOCAL_TrailTop - 256) {
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clean_tr(TR - count PASS_REGS);
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if (!Yap_growtrail(count * sizeof(tr_fr_ptr *), false)) {
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return false;
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}
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goto restart;
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}
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}
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inp = TailOfTerm(inp);
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}
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do {
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Term t = Deref(ARG1);
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out = vars_in_complex_term(&(t)-1, &(t), ARG2 PASS_REGS);
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if (out == 0L) {
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if (!expand_vts(3 PASS_REGS))
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return false;
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}
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} while (out == 0L);
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clean_tr(TR - count PASS_REGS);
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return Yap_unify(ARG3, out);
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}
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/** @pred term_variables(? _Term_, - _Variables_, +_ExternalVars_) is iso
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Unify the difference list between _Variables_ and _ExternaVars_
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with the list of all variables of term _Term_. The variables
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occur in the order of their first appearance when traversing the
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term depth-first, left-to-right.
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|
|
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*/
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static Int p_term_variables3(USES_REGS1) /* variables in term t */
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{
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Term out;
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do {
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Term t = Deref(ARG1);
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if (IsVarTerm(t)) {
|
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Term out = Yap_MkNewPairTerm();
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return Yap_unify(t, HeadOfTerm(out)) &&
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Yap_unify(ARG3, TailOfTerm(out)) && Yap_unify(out, ARG2);
|
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} else if (IsPrimitiveTerm(t)) {
|
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return Yap_unify(ARG2, ARG3);
|
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} else {
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out = vars_in_complex_term(&(t)-1, &(t), ARG3 PASS_REGS);
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}
|
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if (out == 0L) {
|
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if (!expand_vts(3 PASS_REGS))
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return false;
|
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}
|
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} while (out == 0L);
|
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|
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return Yap_unify(ARG2, out);
|
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}
|
|
|
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/**
|
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* Exports a nil-terminated list with all the variables in a term.
|
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* @param[t] the term
|
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* @param[arity] the arity of the calling predicate (required for exact garbage
|
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* collection).
|
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* @param[USES_REGS] threading
|
|
*/
|
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Term Yap_TermVariables(
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Term t, UInt arity USES_REGS) /* variables in term t */
|
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{
|
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Term out;
|
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|
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do {
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t = Deref(t);
|
|
if (IsVarTerm(t)) {
|
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return MkPairTerm(t, TermNil);
|
|
} else if (IsPrimitiveTerm(t)) {
|
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return TermNil;
|
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} else {
|
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out = vars_in_complex_term(&(t)-1, &(t), TermNil PASS_REGS);
|
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}
|
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if (out == 0L) {
|
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if (!expand_vts(arity PASS_REGS))
|
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return false;
|
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}
|
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} while (out == 0L);
|
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return out;
|
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}
|
|
|
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/** @pred term_variables(? _Term_, - _Variables_) is iso
|
|
|
|
|
|
|
|
Unify _Variables_ with the list of all variables of term
|
|
_Term_. The variables occur in the order of their first
|
|
appearance when traversing the term depth-first, left-to-right.
|
|
|
|
|
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*/
|
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static Int p_term_variables(USES_REGS1) /* variables in term t */
|
|
{
|
|
Term out;
|
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|
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if (!Yap_IsListOrPartialListTerm(ARG2)) {
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Yap_Error(TYPE_ERROR_LIST, ARG2, "term_variables/2");
|
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return false;
|
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}
|
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|
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do {
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Term t = Deref(ARG1);
|
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|
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out = vars_in_complex_term(&(t)-1, &(t), TermNil PASS_REGS);
|
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if (out == 0L) {
|
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if (!expand_vts(3 PASS_REGS))
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return false;
|
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}
|
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} while (out == 0L);
|
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return Yap_unify(ARG2, out);
|
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}
|
|
|
|
/** routine to locate attributed variables */
|
|
|
|
typedef struct att_rec {
|
|
CELL *beg, *end;
|
|
CELL oval;
|
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} att_rec_t;
|
|
|
|
static Term attvars_in_complex_term(register CELL *pt0, register CELL *pt0_end,
|
|
Term inp USES_REGS) {
|
|
register tr_fr_ptr TR0 = TR;
|
|
CELL *InitialH = HR;
|
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CELL output = AbsPair(HR);
|
|
|
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WALK_COMPLEX_TERM();
|
|
|
|
if (IsAttVar(ptd0)) {
|
|
/* do or pt2 are unbound */
|
|
attvar_record *a0 = RepAttVar(ptd0);
|
|
if (a0->AttFunc == (Functor)TermNil)
|
|
goto restart;
|
|
/* leave an empty slot to fill in later */
|
|
if (HR + 1024 > ASP) {
|
|
goto global_overflow;
|
|
}
|
|
HR[1] = AbsPair(HR + 2);
|
|
HR += 2;
|
|
HR[-2] = (CELL) & (a0->Done);
|
|
/* store the terms to visit */
|
|
if (to_visit + 32 >= to_visit_max) {
|
|
goto aux_overflow;
|
|
}
|
|
ptd0 = (CELL *)a0;
|
|
to_visit->pt0 = pt0;
|
|
to_visit->pt0_end = pt0_end;
|
|
to_visit->d0 = *ptd0;
|
|
to_visit->ptd0 = ptd0;
|
|
to_visit++;
|
|
*ptd0 = TermNil;
|
|
pt0_end = &RepAttVar(ptd0)->Atts;
|
|
pt0 = pt0_end - 1;
|
|
}
|
|
END_WALK();
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
|
|
pt0 = to_visit->pt0;
|
|
pt0_end = to_visit->pt0_end;
|
|
CELL *ptd0 = to_visit->ptd0;
|
|
*ptd0 = to_visit->d0;
|
|
goto restart;
|
|
}
|
|
|
|
clean_tr(TR0 PASS_REGS);
|
|
pop_text_stack(lvl);
|
|
if (HR != InitialH) {
|
|
/* close the list */
|
|
Term t2 = Deref(inp);
|
|
if (IsVarTerm(t2)) {
|
|
RESET_VARIABLE(HR - 1);
|
|
Yap_unify((CELL)(HR - 1), t2);
|
|
} else {
|
|
HR[-1] = t2; /* don't need to trail */
|
|
}
|
|
return (output);
|
|
} else {
|
|
return (inp);
|
|
}
|
|
|
|
def_aux_overflow();
|
|
def_global_overflow();
|
|
}
|
|
|
|
/** @pred term_attvars(+ _Term_,- _AttVars_)
|
|
|
|
|
|
_AttVars_ is a list of all attributed variables in _Term_ and
|
|
its attributes. I.e., term_attvars/2 works recursively through
|
|
attributes. This predicate is Cycle-safe.
|
|
|
|
|
|
*/
|
|
static Int p_term_attvars(USES_REGS1) /* variables in term t */
|
|
{
|
|
Term out;
|
|
|
|
do {
|
|
Term t = Deref(ARG1);
|
|
if (IsPrimitiveTerm(t)) {
|
|
return Yap_unify(TermNil, ARG2);
|
|
} else {
|
|
out = attvars_in_complex_term(&(t)-1, &(t), TermNil PASS_REGS);
|
|
}
|
|
if (out == 0L) {
|
|
if (!expand_vts(3 PASS_REGS))
|
|
return false;
|
|
}
|
|
} while (out == 0L);
|
|
return Yap_unify(ARG2, out);
|
|
}
|
|
|
|
/** @brief output the difference between variables in _T_ and variables in some
|
|
* list.
|
|
*/
|
|
static Term new_vars_in_complex_term(register CELL *pt0, register CELL *pt0_end,
|
|
Term inp USES_REGS) {
|
|
register tr_fr_ptr TR0 = TR;
|
|
CELL *InitialH = HR;
|
|
CELL output = AbsPair(HR);
|
|
|
|
while (!IsVarTerm(inp) && IsPairTerm(inp)) {
|
|
Term t = HeadOfTerm(inp);
|
|
if (IsVarTerm(t)) {
|
|
CELL *ptr = VarOfTerm(t);
|
|
*ptr = TermFoundVar;
|
|
TrailTerm(TR++) = t;
|
|
if (TR > (tr_fr_ptr)LOCAL_TrailTop - 256) {
|
|
if (!Yap_growtrail((TR - TR0) * sizeof(tr_fr_ptr *), true)) {
|
|
goto trail_overflow;
|
|
}
|
|
}
|
|
}
|
|
inp = TailOfTerm(inp);
|
|
}
|
|
|
|
WALK_COMPLEX_TERM();
|
|
|
|
/* do or pt2 are unbound */
|
|
*ptd0 = TermNil;
|
|
/* leave an empty slot to fill in later */
|
|
if (HR + 1024 > ASP) {
|
|
goto global_overflow;
|
|
}
|
|
HR[1] = AbsPair(HR + 2);
|
|
HR += 2;
|
|
HR[-2] = (CELL)ptd0;
|
|
/* next make sure noone will see this as a variable again */
|
|
if (TR > (tr_fr_ptr)LOCAL_TrailTop - 256) {
|
|
/* Trail overflow */
|
|
if (!Yap_growtrail((TR - TR0) * sizeof(tr_fr_ptr *), true)) {
|
|
goto trail_overflow;
|
|
}
|
|
}
|
|
TrailTerm(TR++) = (CELL)ptd0;
|
|
END_WALK();
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
|
|
pt0 = to_visit->pt0;
|
|
pt0_end = to_visit->pt0_end;
|
|
CELL *ptd0 = to_visit->ptd0;
|
|
*ptd0 = to_visit->d0;
|
|
goto restart;
|
|
}
|
|
|
|
clean_tr(TR0 PASS_REGS);
|
|
pop_text_stack(lvl);
|
|
if (HR != InitialH) {
|
|
HR[-1] = TermNil;
|
|
return output;
|
|
} else {
|
|
return TermNil;
|
|
}
|
|
|
|
def_aux_overflow();
|
|
|
|
def_trail_overflow();
|
|
|
|
def_global_overflow();
|
|
}
|
|
|
|
/** @pred new_variables_in_term(+_CurrentVariables_, ? _Term_, -_Variables_)
|
|
|
|
|
|
|
|
Unify _Variables_ with the list of all variables of term
|
|
_Term_ that do not occur in _CurrentVariables_. The variables occur in the
|
|
order of their first appearance when traversing the term depth-first,
|
|
left-to-right.
|
|
|
|
|
|
*/
|
|
static Int
|
|
p_new_variables_in_term(USES_REGS1) /* variables within term t */
|
|
{
|
|
Term out;
|
|
|
|
do {
|
|
Term t = Deref(ARG2);
|
|
if (IsPrimitiveTerm(t))
|
|
out = TermNil;
|
|
else {
|
|
out = new_vars_in_complex_term(&(t)-1, &(t), Deref(ARG1) PASS_REGS);
|
|
}
|
|
if (out == 0L) {
|
|
if (!expand_vts(3 PASS_REGS))
|
|
return false;
|
|
}
|
|
} while (out == 0L);
|
|
return Yap_unify(ARG3, out);
|
|
}
|
|
|
|
#define FOUND_VAR() \
|
|
if (d0 == TermFoundVar) { \
|
|
/* leave an empty slot to fill in later */ \
|
|
if (HR + 1024 > ASP) { \
|
|
goto global_overflow; \
|
|
} \
|
|
HR[1] = AbsPair(HR + 2); \
|
|
HR += 2; \
|
|
HR[-2] = (CELL)ptd0; \
|
|
*ptd0 = TermNil; \
|
|
}
|
|
|
|
static Term vars_within_complex_term(register CELL *pt0, register CELL *pt0_end,
|
|
Term inp USES_REGS) {
|
|
|
|
tr_fr_ptr TR0 = TR;
|
|
CELL *InitialH = HR;
|
|
CELL output = AbsPair(HR);
|
|
|
|
while (!IsVarTerm(inp) && IsPairTerm(inp)) {
|
|
Term t = HeadOfTerm(inp);
|
|
if (IsVarTerm(t)) {
|
|
CELL *ptr = VarOfTerm(t);
|
|
*ptr = TermFoundVar;
|
|
TrailTerm(TR++) = t;
|
|
if (TR > (tr_fr_ptr)LOCAL_TrailTop - 256) {
|
|
Yap_growtrail((TR - TR0) * sizeof(tr_fr_ptr *), true);
|
|
}
|
|
}
|
|
inp = TailOfTerm(inp);
|
|
}
|
|
|
|
WALK_COMPLEX_TERM__({}, {}, FOUND_VAR());
|
|
|
|
END_WALK();
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
|
|
pt0 = to_visit->pt0;
|
|
pt0_end = to_visit->pt0_end;
|
|
CELL *ptd0 = to_visit->ptd0;
|
|
*ptd0 = to_visit->d0;
|
|
goto restart;
|
|
}
|
|
|
|
clean_tr(TR0 PASS_REGS);
|
|
pop_text_stack(lvl);
|
|
if (HR != InitialH) {
|
|
HR[-1] = TermNil;
|
|
return output;
|
|
} else {
|
|
return TermNil;
|
|
}
|
|
|
|
|
|
def_aux_overflow();
|
|
|
|
def_global_overflow();
|
|
}
|
|
|
|
/** @pred variables_within_term(+_CurrentVariables_, ? _Term_, -_Variables_)
|
|
|
|
Unify _Variables_ with the list of all variables of term _Term_
|
|
that *also* occur in _CurrentVariables_. The variables occur in
|
|
the order of their first appearance when traversing the term
|
|
depth-first, left-to-right.
|
|
|
|
This predicate performs the opposite of new_variables_in_term/3.
|
|
|
|
*/
|
|
static Int p_variables_within_term(USES_REGS1) /* variables within term t */
|
|
{
|
|
Term out;
|
|
|
|
do {
|
|
Term t = Deref(ARG2);
|
|
if (IsPrimitiveTerm(t))
|
|
out = TermNil;
|
|
else {
|
|
out = vars_within_complex_term(&(t)-1, &(t), Deref(ARG1) PASS_REGS);
|
|
}
|
|
if (out == 0L) {
|
|
if (!expand_vts(3 PASS_REGS))
|
|
return false;
|
|
}
|
|
} while (out == 0L);
|
|
return Yap_unify(ARG3, out);
|
|
}
|
|
|
|
static Term free_vars_in_complex_term(CELL *pt0, CELL *pt0_end,
|
|
tr_fr_ptr TR0 USES_REGS) {
|
|
Term o = TermNil;
|
|
CELL *InitialH = HR;
|
|
|
|
WALK_COMPLEX_TERM();
|
|
/* do or pt2 are unbound */
|
|
*ptd0 = TermNil;
|
|
/* leave an empty slot to fill in later */
|
|
if (HR + 1024 > ASP) {
|
|
o = TermNil;
|
|
goto global_overflow;
|
|
}
|
|
HR[0] = (CELL)ptd0;
|
|
HR[1] = o;
|
|
o = AbsPair(HR);
|
|
HR += 2;
|
|
/* next make sure noone will see this as a variable again */
|
|
if (TR > (tr_fr_ptr)LOCAL_TrailTop - 256) {
|
|
/* Trail overflow */
|
|
if (!Yap_growtrail((TR - TR0) * sizeof(tr_fr_ptr *), true)) {
|
|
goto trail_overflow;
|
|
}
|
|
}
|
|
TrailTerm(TR++) = (CELL)ptd0;
|
|
END_WALK();
|
|
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
|
|
pt0 = to_visit->pt0;
|
|
pt0_end = to_visit->pt0_end;
|
|
CELL *ptd0 = to_visit->ptd0;
|
|
*ptd0 = to_visit->d0;
|
|
goto restart;
|
|
}
|
|
|
|
clean_tr(TR0 PASS_REGS);
|
|
pop_text_stack(lvl);
|
|
return o;
|
|
|
|
def_aux_overflow();
|
|
|
|
def_trail_overflow();
|
|
|
|
def_global_overflow();
|
|
}
|
|
|
|
static Term bind_vars_in_complex_term(CELL *pt0, CELL *pt0_end,
|
|
tr_fr_ptr TR0 USES_REGS) {
|
|
CELL *InitialH = HR;
|
|
|
|
WALK_COMPLEX_TERM();
|
|
/* do or pt2 are unbound */
|
|
*ptd0 = TermFoundVar;
|
|
/* next make sure noone will see this as a variable again */
|
|
if (TR > (tr_fr_ptr)LOCAL_TrailTop - 256) {
|
|
/* Trail overflow */
|
|
if (!Yap_growtrail((TR - TR0) * sizeof(tr_fr_ptr *), true)) {
|
|
goto trail_overflow;
|
|
}
|
|
}
|
|
TrailTerm(TR++) = (CELL)ptd0;
|
|
END_WALK();
|
|
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
pt0 = to_visit->ptd0;
|
|
*pt0 = to_visit0->d0;
|
|
goto list_loop;
|
|
}
|
|
|
|
pop_text_stack(lvl);
|
|
return TermNil;
|
|
|
|
def_aux_overflow();
|
|
|
|
def_trail_overflow();
|
|
|
|
}
|
|
|
|
static Int
|
|
p_free_variables_in_term(USES_REGS1) /* variables within term t */
|
|
{
|
|
Term out;
|
|
Term t, t0;
|
|
Term found_module = 0L;
|
|
|
|
do {
|
|
tr_fr_ptr TR0 = TR;
|
|
|
|
t = t0 = Deref(ARG1);
|
|
while (!IsVarTerm(t) && IsApplTerm(t)) {
|
|
Functor f = FunctorOfTerm(t);
|
|
if (f == FunctorHat) {
|
|
out = bind_vars_in_complex_term(RepAppl(t), RepAppl(t) + 1,
|
|
TR0 PASS_REGS);
|
|
if (out == 0L) {
|
|
goto trail_overflow;
|
|
}
|
|
} else if (f == FunctorModule) {
|
|
found_module = ArgOfTerm(1, t);
|
|
} else if (f == FunctorCall) {
|
|
t = ArgOfTerm(1, t);
|
|
} else if (f == FunctorExecuteInMod) {
|
|
found_module = ArgOfTerm(2, t);
|
|
t = ArgOfTerm(1, t);
|
|
} else {
|
|
break;
|
|
}
|
|
t = ArgOfTerm(2, t);
|
|
}
|
|
if (IsPrimitiveTerm(t))
|
|
out = TermNil;
|
|
else {
|
|
out = free_vars_in_complex_term(&(t)-1, &(t), TR0 PASS_REGS);
|
|
}
|
|
if (out == 0L) {
|
|
trail_overflow:
|
|
if (!expand_vts(3 PASS_REGS))
|
|
return false;
|
|
}
|
|
} while (out == 0L);
|
|
if (found_module && t != t0) {
|
|
Term ts[2];
|
|
ts[0] = found_module;
|
|
ts[1] = t;
|
|
t = Yap_MkApplTerm(FunctorModule, 2, ts);
|
|
}
|
|
return Yap_unify(ARG2, t) && Yap_unify(ARG3, out);
|
|
}
|
|
|
|
#define FOUND_VAR_AGAIN() \
|
|
if (d0 == TermFoundVar) { \
|
|
CELL *pt2 = pt0; \
|
|
while (IsVarTerm(*pt2)) \
|
|
pt2 = (CELL *)(*pt2); \
|
|
HR[1] = AbsPair(HR + 2); \
|
|
HR[0] = (CELL)pt2; \
|
|
HR += 2; \
|
|
*pt2 = TermRefoundVar; \
|
|
}
|
|
|
|
static Term non_singletons_in_complex_term(CELL *pt0, CELL *pt0_end USES_REGS) {
|
|
tr_fr_ptr TR0 = TR;
|
|
CELL *InitialH = HR;
|
|
CELL output = AbsPair(HR);
|
|
|
|
WALK_COMPLEX_TERM__({}, {}, FOUND_VAR_AGAIN());
|
|
/* do or pt2 are unbound */
|
|
*ptd0 = TermFoundVar;
|
|
/* next make sure we can recover the variable again */
|
|
TrailTerm(TR++) = (CELL)ptd0;
|
|
END_WALK();
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
|
|
pt0 = to_visit->pt0;
|
|
pt0_end = to_visit->pt0_end;
|
|
CELL *ptd0 = to_visit->ptd0;
|
|
*ptd0 = to_visit->d0;
|
|
goto restart;
|
|
}
|
|
|
|
clean_tr(TR0 PASS_REGS);
|
|
|
|
pop_text_stack(lvl);
|
|
if (HR != InitialH) {
|
|
/* close the list */
|
|
HR[-1] = Deref(ARG2);
|
|
return output;
|
|
} else {
|
|
return ARG2;
|
|
}
|
|
|
|
def_aux_overflow();
|
|
|
|
}
|
|
|
|
static Int p_non_singletons_in_term(
|
|
USES_REGS1) /* non_singletons in term t */
|
|
{
|
|
Term t;
|
|
Term out;
|
|
|
|
while (true) {
|
|
t = Deref(ARG1);
|
|
if (IsVarTerm(t)) {
|
|
out = ARG2;
|
|
} else if (IsPrimitiveTerm(t)) {
|
|
out = ARG2;
|
|
} else {
|
|
out = non_singletons_in_complex_term(&(t)-1, &(t)PASS_REGS);
|
|
}
|
|
if (out != 0L) {
|
|
return Yap_unify(ARG3, out);
|
|
}
|
|
}
|
|
}
|
|
|
|
static Int ground_complex_term(CELL *pt0, CELL *pt0_end USES_REGS) {
|
|
|
|
WALK_COMPLEX_TERM();
|
|
|
|
/* found a variable */
|
|
while (to_visit > to_visit0) {
|
|
to_visit--;
|
|
CELL *ptd0 = to_visit->ptd0;
|
|
*ptd0 = to_visit->d0;
|
|
}
|
|
pop_text_stack(lvl);
|
|
return false;
|
|
END_WALK();
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
|
|
pt0 = to_visit->pt0;
|
|
pt0_end = to_visit->pt0_end;
|
|
CELL *ptd0 = to_visit->ptd0;
|
|
*ptd0 = to_visit->d0;
|
|
goto restart;
|
|
}
|
|
pop_text_stack(lvl);
|
|
return true;
|
|
|
|
def_aux_overflow();
|
|
|
|
|
|
}
|
|
|
|
bool Yap_IsGroundTerm(Term t) {
|
|
CACHE_REGS
|
|
while (true) {
|
|
Int out;
|
|
|
|
if (IsVarTerm(t)) {
|
|
return false;
|
|
} else if (IsPrimitiveTerm(t)) {
|
|
return true;
|
|
} else {
|
|
if ((out = ground_complex_term(&(t)-1, &(t)PASS_REGS)) >= 0) {
|
|
return out != 0;
|
|
}
|
|
if (out < 0) {
|
|
*HR++ = t;
|
|
|
|
t = *--HR;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/** @pred ground( _T_) is iso
|
|
|
|
Succeeds if there are no free variables in the term _T_.
|
|
*/
|
|
static Int p_ground(USES_REGS1) /* ground(+T) */
|
|
{
|
|
return Yap_IsGroundTerm(Deref(ARG1));
|
|
}
|
|
|
|
static Term numbervar(Int id USES_REGS) {
|
|
Term ts[1];
|
|
ts[0] = MkIntegerTerm(id);
|
|
return Yap_MkApplTerm(FunctorDollarVar, 1, ts);
|
|
}
|
|
|
|
static Term numbervar_singleton(USES_REGS1) {
|
|
Term ts[1];
|
|
ts[0] = MkIntegerTerm(-1);
|
|
return Yap_MkApplTerm(FunctorDollarVar, 1, ts);
|
|
}
|
|
|
|
static void renumbervar(Term t, Int id USES_REGS) {
|
|
Term *ts = RepAppl(t);
|
|
ts[1] = MkIntegerTerm(id);
|
|
}
|
|
|
|
#define RENUMBER_SINGLES \
|
|
if (singles && ap2 >= InitialH && ap2 < HR) { \
|
|
renumbervar(d0, numbv++ PASS_REGS); \
|
|
goto restart; \
|
|
}
|
|
|
|
static Int numbervars_in_complex_term(CELL *pt0, CELL *pt0_end, Int numbv,
|
|
int singles USES_REGS) {
|
|
|
|
tr_fr_ptr TR0 = TR;
|
|
CELL *InitialH = HR;
|
|
|
|
WALK_COMPLEX_TERM__({}, RENUMBER_SINGLES, {});
|
|
|
|
/* do or pt2 are unbound */
|
|
if (singles)
|
|
*ptd0 = numbervar_singleton(PASS_REGS1);
|
|
else
|
|
*ptd0 = numbervar(numbv++ PASS_REGS);
|
|
/* leave an empty slot to fill in later */
|
|
if (HR + 1024 > ASP) {
|
|
goto global_overflow;
|
|
}
|
|
/* next make sure noone will see this as a variable again */
|
|
if (TR > (tr_fr_ptr)LOCAL_TrailTop - 256) {
|
|
/* Trail overflow */
|
|
if (!Yap_growtrail((TR - TR0) * sizeof(tr_fr_ptr *), true)) {
|
|
goto trail_overflow;
|
|
}
|
|
}
|
|
|
|
#if defined(TABLING) || defined(YAPOR_SBA)
|
|
TrailVal(TR) = (CELL)ptd0;
|
|
#endif
|
|
TrailTerm(TR++) = (CELL)ptd0;
|
|
|
|
END_WALK();
|
|
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
|
|
pt0 = to_visit->pt0;
|
|
pt0_end = to_visit->pt0_end;
|
|
CELL *ptd0 = to_visit->ptd0;
|
|
*ptd0 = to_visit->d0;
|
|
goto restart;
|
|
}
|
|
|
|
prune(B PASS_REGS);
|
|
pop_text_stack(lvl);
|
|
return numbv;
|
|
|
|
def_aux_overflow();
|
|
|
|
def_global_overflow();
|
|
def_trail_overflow();
|
|
|
|
}
|
|
|
|
Int Yap_NumberVars(Term inp, Int numbv,
|
|
bool handle_singles) /*
|
|
* numbervariables in term t */
|
|
{
|
|
CACHE_REGS
|
|
Int out;
|
|
Term t;
|
|
|
|
restart:
|
|
t = Deref(inp);
|
|
if (IsPrimitiveTerm(t)) {
|
|
return numbv;
|
|
} else {
|
|
|
|
out = numbervars_in_complex_term(&(t)-1, &(t), numbv,
|
|
handle_singles PASS_REGS);
|
|
}
|
|
if (out < numbv) {
|
|
if (!expand_vts(3 PASS_REGS))
|
|
return false;
|
|
goto restart;
|
|
}
|
|
return out;
|
|
}
|
|
|
|
/** @pred numbervars( _T_,+ _N1_,- _Nn_)
|
|
|
|
|
|
Instantiates each variable in term _T_ to a term of the form:
|
|
`$VAR( _I_)`, with _I_ increasing from _N1_ to _Nn_.
|
|
|
|
|
|
*/
|
|
static Int p_numbervars(USES_REGS1) {
|
|
Term t2 = Deref(ARG2);
|
|
Int out;
|
|
|
|
if (IsVarTerm(t2)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t2, "numbervars/3");
|
|
return false;
|
|
}
|
|
if (!IsIntegerTerm(t2)) {
|
|
Yap_Error(TYPE_ERROR_INTEGER, t2, "numbervars/3");
|
|
return (false);
|
|
}
|
|
if ((out = Yap_NumberVars(ARG1, IntegerOfTerm(t2), false)) < 0)
|
|
return false;
|
|
return Yap_unify(ARG3, MkIntegerTerm(out));
|
|
}
|
|
|
|
#define MAX_NUMBERED \
|
|
if (FunctorOfTerm(d0) == FunctorDollarVar) { \
|
|
Term t1 = ArgOfTerm(1, d0); \
|
|
Int i; \
|
|
if (IsIntegerTerm(t1) && ((i = IntegerOfTerm(t1)) > *maxp)) \
|
|
*maxp = i; \
|
|
goto restart; \
|
|
}
|
|
|
|
static int max_numbered_var(CELL *pt0, CELL *pt0_end, Int *maxp USES_REGS) {
|
|
|
|
WALK_COMPLEX_TERM__({}, MAX_NUMBERED, {});
|
|
END_WALK();
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
|
|
pt0 = to_visit->pt0;
|
|
pt0_end = to_visit->pt0_end;
|
|
CELL *ptd0 = to_visit->ptd0;
|
|
*ptd0 = to_visit->d0;
|
|
}
|
|
|
|
prune(B PASS_REGS);
|
|
pop_text_stack(lvl);
|
|
return 0;
|
|
|
|
def_aux_overflow();
|
|
|
|
}
|
|
|
|
static Int MaxNumberedVar(Term inp, UInt arity_REGS) {
|
|
Term t = Deref(inp);
|
|
|
|
if (IsPrimitiveTerm(t)) {
|
|
return MkIntegerTerm(0);
|
|
} else {
|
|
Int res;
|
|
Int max;
|
|
res = max_numbered_var(&t - 1, &t, &max PASS_REGS) - 1;
|
|
if (res < 0)
|
|
return -1;
|
|
return MkIntegerTerm(max);
|
|
}
|
|
}
|
|
|
|
#define BREAK_LOOP(BOTTOM, TOP) (AtomTag | (CELL)to_visit)
|
|
|
|
#define WALK_CYCLES_IN_TERM(LIST0, STRUCT0) \
|
|
if (IsPairTerm(d0)) { \
|
|
if (to_visit + 32 >= to_visit_max) { \
|
|
goto aux_overflow; \
|
|
} \
|
|
CELL *headp = RepPair(d0); \
|
|
if (IsAtomTerm(*headp) && \
|
|
(CELL *)AtomOfTerm(*headp) >= (CELL *)to_visit0 && \
|
|
(CELL *)AtomOfTerm(*headp) < (CELL *)to_visit_max) { \
|
|
LIST0; \
|
|
*headp = BREAK_LOOP(ptd0, headp); \
|
|
goto restart; \
|
|
} \
|
|
to_visit->pt0 = pt0; \
|
|
to_visit->pt0_end = pt0_end; \
|
|
to_visit->ptd0 = headp; \
|
|
to_visit->d0 = *headp; \
|
|
to_visit++; \
|
|
d0 = *headp; \
|
|
pt0 = headp; \
|
|
*pt0 = TermFreeTerm; \
|
|
pt0_end = headp + 1; \
|
|
if (pt0 <= pt0_end) \
|
|
goto list_loop; \
|
|
} else if (IsApplTerm(d0)) { \
|
|
register Functor f; \
|
|
register CELL *ap2; \
|
|
/* store the terms to visit */ \
|
|
ap2 = RepAppl(d0); \
|
|
f = (Functor)(*ap2); \
|
|
\
|
|
if (IsExtensionFunctor(f) || IsAtomTerm((CELL)f)) { \
|
|
\
|
|
*ap2 = BREAK_LOOP(ptd0, ap2); \
|
|
goto restart; \
|
|
} \
|
|
STRUCT0; \
|
|
if (to_visit + 32 >= to_visit_max) { \
|
|
goto aux_overflow; \
|
|
} \
|
|
to_visit->pt0 = pt0; \
|
|
to_visit->pt0_end = pt0_end; \
|
|
to_visit->ptd0 = ap2; \
|
|
to_visit->d0 = *ap2; \
|
|
to_visit++; \
|
|
\
|
|
*ap2 = TermFoundVar; \
|
|
d0 = ArityOfFunctor(f); \
|
|
pt0 = ap2; \
|
|
pt0_end = ap2 + d0; \
|
|
goto restart;\
|
|
}
|
|
|
|
|
|
static int loops_in_complex_term(CELL *pt0, CELL *pt0_end USES_REGS) {
|
|
int lvl = push_text_stack();
|
|
|
|
struct non_single_struct_t *to_visit = Malloc(
|
|
1024 * sizeof(struct non_single_struct_t)),
|
|
*to_visit0 = to_visit,
|
|
*to_visit_max = to_visit + 1024;
|
|
|
|
to_visit0 = to_visit;
|
|
to_visit_max = to_visit0 + 1024;
|
|
restart:
|
|
if (pt0 < pt0_end) {
|
|
CELL d0;
|
|
CELL *ptd0;
|
|
++pt0;
|
|
ptd0 = pt0;
|
|
d0 = *ptd0;
|
|
list_loop:
|
|
deref_head(d0, vars_in_term_unk);
|
|
vars_in_term_nvar : {
|
|
WALK_CYCLES_IN_TERM({}, {});
|
|
|
|
goto restart;
|
|
}
|
|
|
|
derefa_body(d0, ptd0, vars_in_term_unk, vars_in_term_nvar);
|
|
|
|
/* Do we still have compound terms to visit */
|
|
if (to_visit > to_visit0) {
|
|
to_visit--;
|
|
CELL *headp = to_visit->ptd0;
|
|
pt0 = to_visit->pt0;
|
|
pt0_end = to_visit->pt0_end;
|
|
if (IsAtomTerm(*headp) &&
|
|
(CELL *)AtomOfTerm(*headp) >= (CELL *)to_visit0 &&
|
|
(CELL *)AtomOfTerm(*headp) < (CELL *)to_visit_max) {
|
|
*to_visit->ptd0 = to_visit->d0;
|
|
}
|
|
}
|
|
goto restart;
|
|
}
|
|
pop_text_stack(lvl);
|
|
return 0;
|
|
def_aux_overflow();
|
|
}
|
|
|
|
Term Yap_CheckLoops(Term inp, UInt arity_REGS) {
|
|
Term t = Deref(inp);
|
|
return t;
|
|
if (IsPrimitiveTerm(t)) {
|
|
return t;
|
|
} else {
|
|
Int res;
|
|
|
|
res = loops_in_complex_term(&t - 1, &t PASS_REGS) - 1;
|
|
if (res < 0)
|
|
return -1;
|
|
return t;
|
|
}
|
|
}
|
|
|
|
void Yap_InitTermCPreds(void) {
|
|
Yap_InitCPred("term_variables", 2, p_term_variables, 0);
|
|
Yap_InitCPred("term_variables", 3, p_term_variables3, 0);
|
|
Yap_InitCPred("$variables_in_term", 3, p_variables_in_term, 0);
|
|
|
|
Yap_InitCPred("$free_variables_in_term", 3, p_free_variables_in_term, 0);
|
|
|
|
Yap_InitCPred("term_attvars", 2, p_term_attvars, 0);
|
|
|
|
CurrentModule = TERMS_MODULE;
|
|
Yap_InitCPred("variable_in_term", 2, variable_in_term, 0);
|
|
Yap_InitCPred("variables_within_term", 3, p_variables_within_term, 0);
|
|
Yap_InitCPred("new_variables_in_term", 3, p_new_variables_in_term, 0);
|
|
CurrentModule = PROLOG_MODULE;
|
|
|
|
Yap_InitCPred("$non_singletons_in_term", 3, p_non_singletons_in_term, 0);
|
|
|
|
Yap_InitCPred("ground", 1, p_ground, SafePredFlag);
|
|
|
|
Yap_InitCPred("numbervars", 3, p_numbervars, 0);
|
|
}
|