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add foreign value wrapper

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* libguile/foreign.h:
* libguile/foreign.c: New files, implementing simple wrappers around
  foreign values, such as those that one might link in dynamically from
  a library.

* libguile/tags.h (scm_tc7_foreign): Take a tc7 for foreign values.

* libguile.h:
* libguile/init.c: Add foreign.h to headers and init.

* libguile/print.c (iprin1): Add printer for foreign values.

* libguile/gc.c (scm_i_tag_name): Case for foreign values.
* libguile/goops.c (scm_class_of, create_standard_classes): Add a class
  for foreign values.

* libguile/evalext.c (scm_self_evaluating_p): Add case for foreign
  values.

* libguile/Makefile.am: Add foreign.[ch] to the build.
This commit is contained in:
Andy Wingo 2010-01-04 12:11:33 +01:00
parent 208fae8a0e
commit e2c2a6994d
10 changed files with 401 additions and 9 deletions
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87
libguile/foreign.h Normal file
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/* Copyright (C) 2010 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
*/
#ifndef SCM_FOREIGN_H
#define SCM_FOREIGN_H
/* A subset of libffi's types. */
typedef enum
{
SCM_FOREIGN_TYPE_VOID,
SCM_FOREIGN_TYPE_FLOAT,
SCM_FOREIGN_TYPE_DOUBLE,
SCM_FOREIGN_TYPE_UINT8,
SCM_FOREIGN_TYPE_INT8,
SCM_FOREIGN_TYPE_UINT16,
SCM_FOREIGN_TYPE_INT16,
SCM_FOREIGN_TYPE_UINT32,
SCM_FOREIGN_TYPE_INT32,
SCM_FOREIGN_TYPE_UINT64,
SCM_FOREIGN_TYPE_INT64,
SCM_FOREIGN_TYPE_STRUCT,
SCM_FOREIGN_TYPE_POINTER
} scm_t_foreign_type;
typedef void (*scm_t_foreign_finalizer) (void *);
#define SCM_FOREIGN_P(x) \
(!SCM_IMP (x) && SCM_TYP7(x) == scm_tc7_foreign)
#define SCM_VALIDATE_FOREIGN(pos, x) \
SCM_MAKE_VALIDATE (pos, x, FOREIGN_P)
#define SCM_FOREIGN_TYPE(x) \
((scm_t_foreign_type)((SCM_CELL_WORD_0 (x) >> 8)&0xff))
#define SCM_FOREIGN_OBJECT(x, ctype) \
((ctype*)SCM_CELL_OBJECT_1 (x))
#define SCM_FOREIGN_OBJECT_REF(x, ctype) \
(*SCM_FOREIGN_OBJECT (x, ctype))
#define SCM_FOREIGN_OBJECT_SET(x, ctype, val) \
(*SCM_FOREIGN_OBJECT (x, ctype) = (val))
#define SCM_FOREIGN_TYPED_P(x, type) \
(SCM_FOREIGN_P (x) && SCM_FOREIGN_TYPE (x) == SCM_FOREIGN_TYPE_##type)
#define SCM_VALIDATE_FOREIGN_TYPED(pos, x, type) \
do { \
SCM_ASSERT_TYPE (SCM_FOREIGN_TYPED_P (x, type), x, pos, FUNC_NAME, \
"FOREIGN_"#type"_P"); \
} while (0)
#define SCM_FOREIGN_SIMPLE_P(x) \
(SCM_FOREIGN_P (x) \
&& SCM_FOREIGN_TYPE (x) != SCM_FOREIGN_TYPE_VOID \
&& SCM_FOREIGN_TYPE (x) != SCM_FOREIGN_TYPE_STRUCT \
&& SCM_FOREIGN_TYPE (x) != SCM_FOREIGN_TYPE_POINTER)
#define SCM_VALIDATE_FOREIGN_SIMPLE(pos, x) \
SCM_MAKE_VALIDATE (pos, x, FOREIGN_SIMPLE_P)
SCM_API SCM scm_c_from_foreign (scm_t_foreign_type type, void *val, size_t size,
scm_t_foreign_finalizer finalizer);
SCM_API SCM scm_c_take_foreign (scm_t_foreign_type type, void *val,
scm_t_foreign_finalizer finalizer);
SCM_API SCM scm_foreign_ref (SCM foreign);
SCM_API SCM scm_foreign_set_x (SCM foreign, SCM val);
SCM_INTERNAL void scm_i_foreign_print (SCM foreign, SCM port,
scm_print_state *pstate);
SCM_INTERNAL void scm_init_foreign (void);
#endif /* SCM_FOREIGN_H */