236 lines
5.6 KiB
C
236 lines
5.6 KiB
C
#include <stdio.h>
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#include "Yap.h"
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#include "YapInterface.h"
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#include "clause.h"
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#include "clause_list.h"
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#include "udi_private.h"
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/* to keep a vector of udi indexers */
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UT_icd udicb_icd = {sizeof(UdiControlBlock), NULL, NULL, NULL};
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UT_array *indexing_structures;
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/*
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* New user indexed predicate (used by the public udi interface)
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*/
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void
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Yap_UdiRegister(UdiControlBlock cb){
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/*TODO: check structure integrity and duplicates */
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utarray_push_back(indexing_structures, &cb);
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}
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/*
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* New user indexed predicate:
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* the first argument is the term.
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*/
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static YAP_Int
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p_new_udi( USES_REGS1 )
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{
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Term spec = Deref(ARG1);
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PredEntry *p;
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UdiInfo blk;
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int info;
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//fprintf(stderr,"new pred\n");
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/* get the predicate from the spec, copied from cdmgr.c */
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if (IsVarTerm(spec)) {
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Yap_Error(INSTANTIATION_ERROR,spec,"new user index/1");
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return FALSE;
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} else if (!IsApplTerm(spec)) {
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Yap_Error(TYPE_ERROR_COMPOUND,spec,"new user index/1");
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return FALSE;
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} else {
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Functor fun = FunctorOfTerm(spec);
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Term tmod = CurrentModule;
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while (fun == FunctorModule) {
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tmod = ArgOfTerm(1,spec);
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if (IsVarTerm(tmod) ) {
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Yap_Error(INSTANTIATION_ERROR, spec, "new user index/1");
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return FALSE;
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}
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if (!IsAtomTerm(tmod) ) {
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Yap_Error(TYPE_ERROR_ATOM, spec, "new user index/1");
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return FALSE;
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}
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spec = ArgOfTerm(2, spec);
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fun = FunctorOfTerm(spec);
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}
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p = RepPredProp(PredPropByFunc(fun, tmod));
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}
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if (!p)
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return FALSE;
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/* boring, boring, boring! */
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if ((p->PredFlags
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& (DynamicPredFlag|LogUpdatePredFlag|UserCPredFlag|CArgsPredFlag|NumberDBPredFlag|AtomDBPredFlag|TestPredFlag|AsmPredFlag|CPredFlag|BinaryPredFlag))
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|| (p->ModuleOfPred == PROLOG_MODULE)) {
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Yap_Error(PERMISSION_ERROR_MODIFY_STATIC_PROCEDURE, spec, "udi/2");
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return FALSE;
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}
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if (p->PredFlags & (DynamicPredFlag|LogUpdatePredFlag|TabledPredFlag)) {
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Yap_Error(PERMISSION_ERROR_ACCESS_PRIVATE_PROCEDURE, spec, "udi/2");
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return FALSE;
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}
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/* TODO: remove AtomRTree from atom list */
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/* this is the real work */
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blk = (UdiInfo) Yap_AllocCodeSpace(sizeof(struct udi_info));
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memset((void *) blk,0, sizeof(struct udi_info));
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if (!blk) {
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Yap_Error(OUT_OF_HEAP_ERROR, spec, "new user index/1");
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return FALSE;
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}
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utarray_new(blk->clauselist, &ptr_icd);
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utarray_new(blk->args, &arg_icd);
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blk->p = p;
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HASH_ADD_UdiInfo(UdiControlBlocks, p, blk);
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//fprintf(stderr,"PRED %p\n",p);
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info = Yap_udi_args_init(spec, p->ArityOfPE, blk);
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if (!info) /*TODO: clear blk here*/
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return FALSE;
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p->PredFlags |= UDIPredFlag;
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return TRUE;
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}
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/*
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* Here we initialize the arguments indexing
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*/
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int
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Yap_udi_args_init(Term spec, int arity, UdiInfo blk)
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{
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int i;
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Term arg;
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Atom idxtype;
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UdiControlBlock *p;
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struct udi_p_args p_arg;
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//fprintf(stderr,"udi init\n");
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for (i = 1; i <= arity; i++) {
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arg = ArgOfTerm(i,spec);
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if (IsAtomTerm(arg)) {
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idxtype = AtomOfTerm(arg);
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// fprintf(stderr,"%p-%s %p-%s\n",idxtype, YAP_AtomName(idxtype),
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// AtomMinus, YAP_AtomName(AtomMinus));
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if (idxtype == AtomMinus)
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continue;
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p_arg.control = NULL;
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p = NULL;
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while ((p = (UdiControlBlock *) utarray_next(indexing_structures, p))) {
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//fprintf(stderr,"cb: %p %p-%s\n", *p, (*p)->decl, YAP_AtomName((*p)->decl));
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if (idxtype == (*p)->decl){
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p_arg.arg = i;
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p_arg.control = *p;
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p_arg.idxstr = (*p)->init(spec, i, arity);
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utarray_push_back(blk->args, &p_arg);
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}
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}
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if (p_arg.control == NULL){ /* not "-" and not found*/
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fprintf(stderr, "Invalid Spec (%s)\n", AtomName(idxtype));
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return FALSE;
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}
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}
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}
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return TRUE;
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}
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/* just pass info to user, called from cdmgr.c */
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int
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Yap_new_udi_clause(PredEntry *p, yamop *cl, Term t)
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{
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int i;
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UdiPArg parg;
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UdiInfo info;
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/* try to find our structure*/
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HASH_FIND_UdiInfo(UdiControlBlocks,p,info);
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if (!info)
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return FALSE;
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/*insert into clauselist will be used latter*/
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utarray_push_back(info->clauselist,(void *) cl);
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for (i = 0; i < utarray_len(info->args) ; i++) {
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parg = (UdiPArg) utarray_eltptr(info->args,i);
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//fprintf(stderr,"call insert\n");
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parg->idxstr = parg->control->insert(parg->idxstr, t, parg->arg, (void *)cl);
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//info->cb = info->functions->insert(t, info->cb, (void *)cl);
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}
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return TRUE;
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}
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/* index, called from absmi.c */
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yamop *
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Yap_udi_search(PredEntry *p)
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{
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int i, r = -1;
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struct ClauseList clauselist;
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struct CallbackM cm;
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callback_m_t c;
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UdiPArg parg;
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UdiInfo info;
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/* find our structure*/
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HASH_FIND_UdiInfo(UdiControlBlocks,p,info);
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if (!info)
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return NULL;
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/*TODO: handle intersection*/
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c = &cm;
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c->cl = Yap_ClauseListInit(&clauselist);
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c->pred = p;
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for (i = 0; i < utarray_len(info->args) ; i++) {
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parg = (UdiPArg) utarray_eltptr(info->args,i);
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//fprintf(stderr,"call search %d %p\n", i, (void *)c);
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r = parg->control->search(parg->idxstr, parg->arg, callback, c);
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/*info->functions->search(info->cb);*/
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}
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Yap_ClauseListClose(c->cl);
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if (r >= 0) {
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if (Yap_ClauseListCount(c->cl) == 0)
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{
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Yap_ClauseListDestroy(c->cl);
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return Yap_FAILCODE();
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}
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if (Yap_ClauseListCount(c->cl) == 1)
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{
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return Yap_ClauseListToClause(c->cl);
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}
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return Yap_ClauseListCode(c->cl);
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}
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else
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Yap_ClauseListDestroy(c->cl);
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return NULL;
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}
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/* index, called from absmi.c */
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void
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Yap_udi_abolish(PredEntry *p)
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{
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/* tell the predicate destroy */
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}
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/*
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* Init Yap udi interface
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*/
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void
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Yap_udi_init(void)
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{
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UdiControlBlocks = NULL;
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/*init indexing structures array*/
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utarray_new(indexing_structures, &udicb_icd);
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Yap_InitCPred("$udi_init", 1, p_new_udi, 0);
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/* TODO: decide if udi.yap should be loaded automaticaly in init.yap */
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}
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