diff options
Diffstat (limited to 'libguile/weak-vector.c')
-rw-r--r-- | libguile/weak-vector.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/libguile/weak-vector.c b/libguile/weak-vector.c new file mode 100644 index 000000000..a42166bf5 --- /dev/null +++ b/libguile/weak-vector.c @@ -0,0 +1,207 @@ +/* Copyright (C) 1995,1996,1998,2000,2001, 2003, 2006, 2008, 2009, 2010, 2011 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 + */ + + + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <stdio.h> + +#include "libguile/_scm.h" +#include "libguile/vectors.h" + +#include "libguile/validate.h" + + + +/* {Weak Vectors} + */ + +#define VECTOR_MAX_LENGTH (SCM_T_BITS_MAX >> 8) + +static SCM +make_weak_vector (size_t len, SCM fill) +#define FUNC_NAME "make-weak-vector" +{ + SCM wv; + size_t j; + + SCM_ASSERT_RANGE (1, scm_from_size_t (len), len <= VECTOR_MAX_LENGTH); + + if (SCM_UNBNDP (fill)) + fill = SCM_UNSPECIFIED; + + wv = PTR2SCM (scm_gc_malloc_pointerless ((len + 1) * sizeof (SCM), + "weak vector")); + + SCM_SET_CELL_WORD_0 (wv, (len << 8) | scm_tc7_wvect); + + if (SCM_NIMP (fill)) + { + memset (SCM_I_VECTOR_WELTS (wv), 0, len * sizeof (SCM)); + for (j = 0; j < len; j++) + scm_c_weak_vector_set_x (wv, j, fill); + } + else + for (j = 0; j < len; j++) + SCM_SIMPLE_VECTOR_SET (wv, j, fill); + + return wv; +} +#undef FUNC_NAME + +SCM_DEFINE (scm_make_weak_vector, "make-weak-vector", 1, 1, 0, + (SCM size, SCM fill), + "Return a weak vector with @var{size} elements. If the optional\n" + "argument @var{fill} is given, all entries in the vector will be\n" + "set to @var{fill}. The default value for @var{fill} is the\n" + "empty list.") +#define FUNC_NAME s_scm_make_weak_vector +{ + return make_weak_vector (scm_to_size_t (size), fill); +} +#undef FUNC_NAME + + +SCM_REGISTER_PROC(s_list_to_weak_vector, "list->weak-vector", 1, 0, 0, scm_weak_vector); + +SCM_DEFINE (scm_weak_vector, "weak-vector", 0, 0, 1, + (SCM lst), + "@deffnx {Scheme Procedure} list->weak-vector lst\n" + "Construct a weak vector from a list: @code{weak-vector} uses\n" + "the list of its arguments while @code{list->weak-vector} uses\n" + "its only argument @var{l} (a list) to construct a weak vector\n" + "the same way @code{list->vector} would.") +#define FUNC_NAME s_scm_weak_vector +{ + SCM wv; + size_t i; + long c_size; + + SCM_VALIDATE_LIST_COPYLEN (SCM_ARG1, lst, c_size); + + wv = make_weak_vector ((size_t) c_size, SCM_BOOL_F); + + for (i = 0; scm_is_pair (lst); lst = SCM_CDR (lst), i++) + scm_c_weak_vector_set_x (wv, i, SCM_CAR (lst)); + + return wv; +} +#undef FUNC_NAME + + +SCM_DEFINE (scm_weak_vector_p, "weak-vector?", 1, 0, 0, + (SCM obj), + "Return @code{#t} if @var{obj} is a weak vector. Note that all\n" + "weak hashes are also weak vectors.") +#define FUNC_NAME s_scm_weak_vector_p +{ + return scm_from_bool (SCM_I_WVECTP (obj)); +} +#undef FUNC_NAME + + +struct weak_vector_ref_data +{ + SCM wv; + size_t k; +}; + +static void* +weak_vector_ref (void *data) +{ + struct weak_vector_ref_data *d = data; + + return SCM_SIMPLE_VECTOR_REF (d->wv, d->k); +} + +SCM +scm_c_weak_vector_ref (SCM wv, size_t k) +{ + struct weak_vector_ref_data d; + void *ret; + + d.wv = wv; + d.k = k; + + if (k >= SCM_I_VECTOR_LENGTH (wv)) + scm_out_of_range (NULL, scm_from_size_t (k)); + + ret = GC_call_with_alloc_lock (weak_vector_ref, &d); + + if (ret) + return PTR2SCM (ret); + else + return SCM_BOOL_F; +} + + +void +scm_c_weak_vector_set_x (SCM wv, size_t k, SCM x) +{ + SCM *elts; + struct weak_vector_ref_data d; + void *prev; + + d.wv = wv; + d.k = k; + + if (k >= SCM_I_VECTOR_LENGTH (wv)) + scm_out_of_range (NULL, scm_from_size_t (k)); + + prev = GC_call_with_alloc_lock (weak_vector_ref, &d); + + elts = SCM_I_VECTOR_WELTS (wv); + + if (prev && SCM_NIMP (PTR2SCM (prev))) + GC_unregister_disappearing_link ((GC_PTR) &elts[k]); + + elts[k] = x; + + if (SCM_NIMP (x)) + SCM_I_REGISTER_DISAPPEARING_LINK ((GC_PTR) &elts[k], + (GC_PTR) SCM2PTR (x)); +} + + + +static void +scm_init_weak_vector_builtins (void) +{ +#ifndef SCM_MAGIC_SNARFER +#include "libguile/weak-vector.x" +#endif +} + +void +scm_init_weak_vectors () +{ + scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION, + "scm_init_weak_vector_builtins", + (scm_t_extension_init_func)scm_init_weak_vector_builtins, + NULL); +} + + +/* + Local Variables: + c-file-style: "gnu" + End: +*/ |