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Diffstat (limited to 'libguile/array-handle.c')
-rw-r--r-- | libguile/array-handle.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/libguile/array-handle.c b/libguile/array-handle.c new file mode 100644 index 000000000..cd5a46698 --- /dev/null +++ b/libguile/array-handle.c @@ -0,0 +1,162 @@ +/* Copyright (C) 1995,1996,1997,1998,2000,2001,2002,2003,2004, 2005, 2006, 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 + */ + + + + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include "libguile/_scm.h" +#include "libguile/__scm.h" + +#include "libguile/array-handle.h" + + +SCM scm_i_array_element_types[SCM_ARRAY_ELEMENT_TYPE_LAST + 1]; + + +#define ARRAY_IMPLS_N_STATIC_ALLOC 7 +static scm_t_array_implementation array_impls[ARRAY_IMPLS_N_STATIC_ALLOC]; +static int num_array_impls_registered = 0; + + +void +scm_i_register_array_implementation (scm_t_array_implementation *impl) +{ + if (num_array_impls_registered >= ARRAY_IMPLS_N_STATIC_ALLOC) + /* need to increase ARRAY_IMPLS_N_STATIC_ALLOC, buster */ + abort (); + else + array_impls[num_array_impls_registered++] = *impl; +} + +scm_t_array_implementation* +scm_i_array_implementation_for_obj (SCM obj) +{ + int i; + for (i = 0; i < num_array_impls_registered; i++) + if (SCM_NIMP (obj) + && (SCM_CELL_TYPE (obj) & array_impls[i].mask) == array_impls[i].tag) + return &array_impls[i]; + return NULL; +} + +void +scm_array_get_handle (SCM array, scm_t_array_handle *h) +{ + scm_t_array_implementation *impl = scm_i_array_implementation_for_obj (array); + if (!impl) + scm_wrong_type_arg_msg (NULL, 0, array, "array"); + h->array = array; + h->impl = impl; + h->base = 0; + h->ndims = 0; + h->dims = NULL; + h->element_type = SCM_ARRAY_ELEMENT_TYPE_SCM; /* have to default to + something... */ + h->elements = NULL; + h->writable_elements = NULL; + h->impl->get_handle (array, h); +} + +ssize_t +scm_array_handle_pos (scm_t_array_handle *h, SCM indices) +{ + scm_t_array_dim *s = scm_array_handle_dims (h); + ssize_t pos = 0, i; + size_t k = scm_array_handle_rank (h); + + while (k > 0 && scm_is_pair (indices)) + { + i = scm_to_signed_integer (SCM_CAR (indices), s->lbnd, s->ubnd); + pos += (i - s->lbnd) * s->inc; + k--; + s++; + indices = SCM_CDR (indices); + } + if (k > 0 || !scm_is_null (indices)) + scm_misc_error (NULL, "wrong number of indices, expecting ~a", + scm_list_1 (scm_from_size_t (scm_array_handle_rank (h)))); + return pos; +} + +SCM +scm_array_handle_element_type (scm_t_array_handle *h) +{ + if (h->element_type < 0 || h->element_type > SCM_ARRAY_ELEMENT_TYPE_LAST) + abort (); /* guile programming error */ + return scm_i_array_element_types[h->element_type]; +} + +void +scm_array_handle_release (scm_t_array_handle *h) +{ + /* Nothing to do here until arrays need to be reserved for real. + */ +} + +const SCM * +scm_array_handle_elements (scm_t_array_handle *h) +{ + if (h->element_type != SCM_ARRAY_ELEMENT_TYPE_SCM) + scm_wrong_type_arg_msg (NULL, 0, h->array, "non-uniform array"); + return ((const SCM*)h->elements) + h->base; +} + +SCM * +scm_array_handle_writable_elements (scm_t_array_handle *h) +{ + if (h->element_type != SCM_ARRAY_ELEMENT_TYPE_SCM) + scm_wrong_type_arg_msg (NULL, 0, h->array, "non-uniform array"); + return ((SCM*)h->elements) + h->base; +} + +void +scm_init_array_handle (void) +{ +#define DEFINE_ARRAY_TYPE(tag, TAG) \ + scm_i_array_element_types[SCM_ARRAY_ELEMENT_TYPE_##TAG] \ + = (scm_permanent_object (scm_from_locale_symbol (#tag))) + + scm_i_array_element_types[SCM_ARRAY_ELEMENT_TYPE_SCM] = SCM_BOOL_T; + DEFINE_ARRAY_TYPE (a, CHAR); + DEFINE_ARRAY_TYPE (b, BIT); + DEFINE_ARRAY_TYPE (vu8, VU8); + DEFINE_ARRAY_TYPE (u8, U8); + DEFINE_ARRAY_TYPE (s8, S8); + DEFINE_ARRAY_TYPE (u16, U16); + DEFINE_ARRAY_TYPE (s16, S16); + DEFINE_ARRAY_TYPE (u32, U32); + DEFINE_ARRAY_TYPE (s32, S32); + DEFINE_ARRAY_TYPE (u64, U64); + DEFINE_ARRAY_TYPE (s64, S64); + DEFINE_ARRAY_TYPE (f32, F32); + DEFINE_ARRAY_TYPE (f64, F64); + DEFINE_ARRAY_TYPE (c32, C32); + DEFINE_ARRAY_TYPE (c64, C64); + +#include "libguile/array-handle.x" +} + +/* + Local Variables: + c-file-style: "gnu" + End: +*/ |