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/* classes: h_files */
#ifndef SCM_WEAKS_H
#define SCM_WEAKS_H
/* Copyright (C) 1995,1996,2000,2001, 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "libguile/__scm.h"
#define SCM_WVECTF_WEAK_KEY 1
#define SCM_WVECTF_WEAK_VALUE 2
#define SCM_WVECT_WEAK_KEY_P(x) (SCM_I_WVECT_EXTRA(x) & SCM_WVECTF_WEAK_KEY)
#define SCM_WVECT_WEAK_VALUE_P(x) (SCM_I_WVECT_EXTRA(x) & SCM_WVECTF_WEAK_VALUE)
#define SCM_I_WVECT_TYPE(x) (SCM_I_WVECT_EXTRA(x) & 7)
#define SCM_I_SET_WVECT_TYPE(x,t) (SCM_I_SET_WVECT_EXTRA \
((x), (SCM_I_WVECT_EXTRA (x) & ~7) | (t)))
#define SCM_IS_WHVEC(X) (SCM_I_WVECT_TYPE (X) == 1)
#define SCM_IS_WHVEC_V(X) (SCM_I_WVECT_TYPE (X) == 2)
#define SCM_IS_WHVEC_B(X) (SCM_I_WVECT_TYPE (X) == 3)
#define SCM_IS_WHVEC_ANY(X) (SCM_I_WVECT_TYPE (X) != 0)
/* Weak pairs. */
SCM_INTERNAL SCM scm_weak_car_pair (SCM car, SCM cdr);
SCM_INTERNAL SCM scm_weak_cdr_pair (SCM car, SCM cdr);
SCM_INTERNAL SCM scm_doubly_weak_pair (SCM car, SCM cdr);
/* Testing the weak component(s) of a cell for reachability. */
#define SCM_WEAK_PAIR_WORD_DELETED_P(_cell, _word) \
(SCM_CELL_OBJECT ((_cell), (_word)) == SCM_PACK (NULL))
#define SCM_WEAK_PAIR_CAR_DELETED_P(_cell) \
(SCM_WEAK_PAIR_WORD_DELETED_P ((_cell), 0))
#define SCM_WEAK_PAIR_CDR_DELETED_P(_cell) \
(SCM_WEAK_PAIR_WORD_DELETED_P ((_cell), 1))
#define SCM_WEAK_PAIR_DELETED_P(_cell) \
((SCM_WEAK_PAIR_CAR_DELETED_P (_cell)) \
|| (SCM_WEAK_PAIR_CDR_DELETED_P (_cell)))
/* Accessing the components of a weak cell. These return `SCM_UNDEFINED' if
the car/cdr has been collected. */
#define SCM_WEAK_PAIR_WORD(_cell, _word) \
(SCM_WEAK_PAIR_WORD_DELETED_P ((_cell), (_word)) \
? SCM_UNDEFINED \
: SCM_CELL_OBJECT ((_cell), (_word)))
#define SCM_WEAK_PAIR_CAR(_cell) (SCM_WEAK_PAIR_WORD ((_cell), 0))
#define SCM_WEAK_PAIR_CDR(_cell) (SCM_WEAK_PAIR_WORD ((_cell), 1))
/* Weak vectors and weak hash tables. */
SCM_API SCM scm_make_weak_vector (SCM k, SCM fill);
SCM_API SCM scm_weak_vector (SCM l);
SCM_API SCM scm_weak_vector_p (SCM x);
SCM_API SCM scm_make_weak_key_alist_vector (SCM k);
SCM_API SCM scm_make_weak_value_alist_vector (SCM k);
SCM_API SCM scm_make_doubly_weak_alist_vector (SCM k);
SCM_API SCM scm_weak_key_alist_vector_p (SCM x);
SCM_API SCM scm_weak_value_alist_vector_p (SCM x);
SCM_API SCM scm_doubly_weak_alist_vector_p (SCM x);
SCM_INTERNAL SCM scm_init_weaks_builtins (void);
SCM_INTERNAL void scm_weaks_prehistory (void);
SCM_INTERNAL void scm_init_weaks (void);
SCM_INTERNAL void scm_i_init_weak_vectors_for_gc (void);
SCM_INTERNAL void scm_i_mark_weak_vector (SCM w);
SCM_INTERNAL int scm_i_mark_weak_vectors_non_weaks (void);
SCM_INTERNAL void scm_i_remove_weaks_from_weak_vectors (void);
#endif /* SCM_WEAKS_H */
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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