94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/* $Id$
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Part of SWI-Prolog
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Author: Jan Wielemaker
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E-mail: J.Wielemaker@uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2008, University of Amsterdam
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PL_PRIVITF_H_INCLUDED
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#define PL_PRIVITF_H_INCLUDED
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COMMON(int) PL_get_char(term_t c, int *p, int eof);
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COMMON(int) PL_unify_char(term_t chr, int c, int mode);
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COMMON(int) PL_unify_predicate(term_t head, predicate_t pred, int how);
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/*******************************
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* LIST BUILDING *
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*******************************/
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Quickly create a list on the stack. This is for creating lists were we
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can give an upperbound to the length in advance. By allocation upfront,
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we know there are no garbage collections or stack-shifts and we can
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avoid using term-references to address the list.
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* allocList(size_t maxcells, list_ctx *ctx)
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Allocate enough space on the stack for a list of maxcells elements.
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The final list may be shorter!
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* addSmallIntList(list_ctx *ctx, int value)
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Add a small integer to the list
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* unifyList(term_t term, list_ctx *ctx);
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Unify term with the created list. This closes the list and adjusts
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the top of the stack.
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* unifyDiffList(term_t head, term_t tail, list_ctx *ctx);
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Represent the list as Head\Tail. This adjusts the top of the stack.
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#if __YAP_PROLOG__
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typedef struct list_ctx
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{
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YAP_Term gstore;
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YAP_Term start;
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} list_ctx;
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static inline void
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addSmallIntList(list_ctx *ctx, int value)
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{
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ctx->gstore = YAP_ExtendList(ctx->gstore,YAP_MkIntTerm(value));
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}
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#else
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typedef struct list_ctx
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{ Word lp;
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Word gstore;
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} list_ctx;
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static inline void
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addSmallIntList(list_ctx *ctx, int value)
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{ ctx->gstore[0] = consPtr(&ctx->gstore[1], TAG_COMPOUND|STG_GLOBAL);
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ctx->gstore[1] = FUNCTOR_dot2;
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ctx->gstore[2] = consInt(value);
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ctx->gstore += 3;
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}
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#endif
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COMMON(int) allocList(size_t maxcells, list_ctx *ctx);
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COMMON(int) unifyList(term_t term, list_ctx *ctx);
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COMMON(int) unifyDiffList(term_t head, term_t tail, list_ctx *ctx);
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#endif /*PL_PRIVITF_H_INCLUDED*/
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