diff options
Diffstat (limited to 'libguile/foreign-object.c')
-rw-r--r-- | libguile/foreign-object.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/libguile/foreign-object.c b/libguile/foreign-object.c new file mode 100644 index 000000000..830f73f80 --- /dev/null +++ b/libguile/foreign-object.c @@ -0,0 +1,229 @@ +/* Copyright (C) 2014 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/goops.h" +#include "libguile/foreign-object.h" + + + + +static SCM make_fobj_type_var; + +static void +init_make_fobj_type_var (void) +{ + make_fobj_type_var = scm_c_private_lookup ("system foreign-object", + "make-foreign-object-type"); +} + +SCM +scm_make_foreign_object_type (SCM name, SCM slot_names, + scm_t_struct_finalize finalizer) +{ + SCM type; + + static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT; + scm_i_pthread_once (&once, init_make_fobj_type_var); + + type = scm_call_2 (scm_variable_ref (make_fobj_type_var), name, slot_names); + + if (finalizer) + SCM_SET_VTABLE_INSTANCE_FINALIZER (type, finalizer); + + return type; +} + +void +scm_assert_foreign_object_type (SCM type, SCM val) +{ + if (!SCM_IS_A_P (val, type)) + scm_error (scm_arg_type_key, NULL, "Wrong type (expecting ~A): ~S", + scm_list_2 (scm_class_name (type), val), scm_list_1 (val)); +} + +SCM +scm_make_foreign_object_0 (SCM type) +{ + return scm_make_foreign_object_n (type, 0, NULL); +} + +SCM +scm_make_foreign_object_1 (SCM type, void *val0) +{ + return scm_make_foreign_object_n (type, 1, &val0); +} + +SCM +scm_make_foreign_object_2 (SCM type, void *val0, void *val1) +{ + void *vals[2]; + + vals[0] = val0; + vals[1] = val1; + + return scm_make_foreign_object_n (type, 2, vals); +} + +SCM +scm_make_foreign_object_3 (SCM type, void *val0, void *val1, void *val2) +{ + void *vals[3]; + + vals[0] = val0; + vals[1] = val1; + vals[2] = val2; + + return scm_make_foreign_object_n (type, 3, vals); +} + +SCM +scm_make_foreign_object_n (SCM type, size_t n, void *vals[]) +#define FUNC_NAME "make-foreign-object" +{ + SCM obj; + SCM layout; + size_t i; + const char *layout_chars; + + SCM_VALIDATE_VTABLE (SCM_ARG1, type); + + layout = SCM_VTABLE_LAYOUT (type); + + if (scm_i_symbol_length (layout) / 2 < n) + scm_out_of_range (FUNC_NAME, scm_from_size_t (n)); + + layout_chars = scm_i_symbol_chars (layout); + for (i = 0; i < n; i++) + if (layout_chars[i * 2] != 'u') + scm_wrong_type_arg_msg (FUNC_NAME, 0, layout, "'u' field"); + + obj = scm_c_make_structv (type, 0, 0, NULL); + + for (i = 0; i < n; i++) + SCM_STRUCT_DATA_SET (obj, i, (scm_t_bits) vals[i]); + + return obj; +} +#undef FUNC_NAME + +scm_t_bits +scm_foreign_object_unsigned_ref (SCM obj, size_t n) +#define FUNC_NAME "foreign-object-ref" +{ + SCM layout; + + SCM_VALIDATE_STRUCT (SCM_ARG1, obj); + + layout = SCM_STRUCT_LAYOUT (obj); + if (scm_i_symbol_length (layout) / 2 < n) + scm_out_of_range (FUNC_NAME, scm_from_size_t (n)); + + if (scm_i_symbol_ref (layout, n * 2) != 'u') + scm_wrong_type_arg_msg (FUNC_NAME, 0, layout, "'u' field"); + + return SCM_STRUCT_DATA_REF (obj, n); +} +#undef FUNC_NAME + +void +scm_foreign_object_unsigned_set_x (SCM obj, size_t n, scm_t_bits val) +#define FUNC_NAME "foreign-object-set!" +{ + SCM layout; + + SCM_VALIDATE_STRUCT (SCM_ARG1, obj); + + layout = SCM_STRUCT_LAYOUT (obj); + if (scm_i_symbol_length (layout) / 2 < n) + scm_out_of_range (FUNC_NAME, scm_from_size_t (n)); + + if (scm_i_symbol_ref (layout, n * 2) != 'u') + scm_wrong_type_arg_msg (FUNC_NAME, 0, layout, "'u' field"); + + SCM_STRUCT_DATA_SET (obj, n, val); +} +#undef FUNC_NAME + +scm_t_signed_bits +scm_foreign_object_signed_ref (SCM obj, size_t n) +{ + scm_t_bits bits = scm_foreign_object_unsigned_ref (obj, n); + return (scm_t_signed_bits) bits; +} + +void +scm_foreign_object_signed_set_x (SCM obj, size_t n, scm_t_signed_bits val) +{ + scm_t_bits bits = (scm_t_bits) val; + scm_foreign_object_unsigned_set_x (obj, n, bits); +} + +void* +scm_foreign_object_ref (SCM obj, size_t n) +{ + scm_t_bits bits = scm_foreign_object_unsigned_ref (obj, n); + return (void *) bits; +} + +void +scm_foreign_object_set_x (SCM obj, size_t n, void *val) +{ + scm_t_bits bits = (scm_t_bits) val; + scm_foreign_object_unsigned_set_x (obj, n, bits); +} + +static void +invoke_finalizer (void *obj, void *data) +{ + scm_call_1 (PTR2SCM (data), PTR2SCM (obj)); +} + +static SCM +sys_add_finalizer_x (SCM obj, SCM finalizer) +#define FUNC_NAME "%add-finalizer!" +{ + SCM_VALIDATE_PROC (SCM_ARG2, finalizer); + + scm_i_add_finalizer (SCM2PTR (obj), invoke_finalizer, SCM2PTR (finalizer)); + + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + +static void +scm_init_foreign_object (void) +{ + scm_c_define_gsubr ("%add-finalizer!", 2, 0, 0, + (scm_t_subr) sys_add_finalizer_x); +} + +void +scm_register_foreign_object (void) +{ + scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION, + "scm_init_foreign_object", + (scm_t_extension_init_func)scm_init_foreign_object, + NULL); +} |