mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-30 11:50:28 +02:00
131 lines
5.3 KiB
C
131 lines
5.3 KiB
C
#ifndef SCM_FOREIGN_H
|
||
#define SCM_FOREIGN_H
|
||
|
||
/* 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
|
||
*/
|
||
|
||
#include "libguile/__scm.h"
|
||
|
||
/* A foreign value is some value that exists outside of Guile. It is represented
|
||
by a cell whose second word is a pointer. The first word has the
|
||
scm_tc7_foreign typecode and type of the aliased (pointed-to) value in its
|
||
lower 16 bits.
|
||
|
||
There are numeric types, like uint32 and float, and there is a "generic
|
||
pointer" type, void. Void pointers also have a length associated with them,
|
||
in the high bits of the first word of the SCM object, but since they really
|
||
are pointers out into the wild wooly world of C, perhaps we don't actually
|
||
know how much memory they take up. In that, most general case, the "len"
|
||
will be stored as 0.
|
||
|
||
The basic idea is that we can help the programmer to avoid cutting herself,
|
||
but we won't take away her knives.
|
||
*/
|
||
typedef enum
|
||
{
|
||
SCM_FOREIGN_TYPE_VOID, /* a pointer out into the wilderness */
|
||
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_LAST = SCM_FOREIGN_TYPE_INT64
|
||
} 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_POINTER(x, ctype) \
|
||
((ctype*)SCM_CELL_WORD_1 (x))
|
||
#define SCM_FOREIGN_VALUE_REF(x, ctype) \
|
||
(*SCM_FOREIGN_POINTER (x, ctype))
|
||
#define SCM_FOREIGN_VALUE_SET(x, ctype, val) \
|
||
(*SCM_FOREIGN_POINTER (x, ctype) = (val))
|
||
#define SCM_FOREIGN_HAS_FINALIZER(x) \
|
||
((SCM_CELL_WORD_0 (x) >> 16) & 0x1)
|
||
#define SCM_FOREIGN_LEN(x) \
|
||
((size_t)(SCM_CELL_WORD_0 (x) >> 17))
|
||
|
||
#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_VALUE_P(x) \
|
||
(SCM_FOREIGN_P (x) && SCM_FOREIGN_TYPE (x) != SCM_FOREIGN_TYPE_VOID)
|
||
#define SCM_VALIDATE_FOREIGN_VALUE(pos, x) \
|
||
SCM_MAKE_VALIDATE (pos, x, FOREIGN_VALUE_P)
|
||
|
||
SCM_API SCM scm_take_foreign_pointer (scm_t_foreign_type type, void *ptr,
|
||
size_t len,
|
||
scm_t_foreign_finalizer finalizer);
|
||
|
||
SCM_API SCM scm_alignof (SCM type);
|
||
SCM_API SCM scm_sizeof (SCM type);
|
||
SCM_API SCM scm_foreign_type (SCM foreign);
|
||
SCM_API SCM scm_foreign_ref (SCM foreign);
|
||
SCM_API SCM scm_foreign_set_x (SCM foreign, SCM val);
|
||
SCM_API SCM scm_foreign_to_bytevector (SCM foreign, SCM type,
|
||
SCM offset, SCM len);
|
||
SCM_API SCM scm_foreign_set_finalizer_x (SCM foreign, SCM finalizer);
|
||
SCM_API SCM scm_bytevector_to_foreign (SCM bv, SCM offset, SCM len);
|
||
|
||
SCM_INTERNAL void scm_i_foreign_print (SCM foreign, SCM port,
|
||
scm_print_state *pstate);
|
||
|
||
|
||
|
||
/* Foreign functions */
|
||
|
||
/* The goal is to make it so that calling a foreign function doesn't cause any
|
||
heap allocation. That means we need native Scheme formats for all kinds of
|
||
arguments.
|
||
|
||
For "value" types like s64 or f32, we just use native Scheme value types.
|
||
(Note that in both these cases, allocation is possible / likely, as the
|
||
value might need to be boxed, but perhaps we won't worry about that. Hmm.)
|
||
|
||
For everything else, we use foreign pointers. This includes arrays, pointer
|
||
arguments and return vals, struct args and return vals, and out and in/out
|
||
arguments.
|
||
*/
|
||
|
||
SCM_API SCM scm_make_foreign_function (SCM return_type, SCM func_ptr,
|
||
SCM arg_types);
|
||
SCM_INTERNAL SCM scm_i_foreign_call (SCM foreign, SCM *argv);
|
||
|
||
|
||
|
||
SCM_INTERNAL void scm_register_foreign (void);
|
||
|
||
|
||
#endif /* SCM_FOREIGN_H */
|