1 /* Copyright (C) 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public License
5 * as published by the Free Software Foundation; either version 3 of
6 * the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
30 #include "libguile/_scm.h"
31 #include "libguile/bytevectors.h"
32 #include "libguile/instructions.h"
33 #include "libguile/threads.h"
34 #include "libguile/foreign.h"
38 SCM_SYMBOL (sym_void
, "void");
39 SCM_SYMBOL (sym_float
, "float");
40 SCM_SYMBOL (sym_double
, "double");
41 SCM_SYMBOL (sym_uint8
, "uint8");
42 SCM_SYMBOL (sym_int8
, "int8");
43 SCM_SYMBOL (sym_uint16
, "uint16");
44 SCM_SYMBOL (sym_int16
, "int16");
45 SCM_SYMBOL (sym_uint32
, "uint32");
46 SCM_SYMBOL (sym_int32
, "int32");
47 SCM_SYMBOL (sym_uint64
, "uint64");
48 SCM_SYMBOL (sym_int64
, "int64");
49 SCM_SYMBOL (sym_short
, "short");
50 SCM_SYMBOL (sym_int
, "int");
51 SCM_SYMBOL (sym_long
, "long");
52 SCM_SYMBOL (sym_unsigned_short
, "unsigned-short");
53 SCM_SYMBOL (sym_unsigned_int
, "unsigned-int");
54 SCM_SYMBOL (sym_unsigned_long
, "unsigned-long");
55 SCM_SYMBOL (sym_size_t
, "size_t");
56 SCM_SYMBOL (sym_ssize_t
, "ssize_t");
57 SCM_SYMBOL (sym_ptrdiff_t
, "ptrdiff_t");
59 /* that's for pointers, you know. */
60 SCM_SYMBOL (sym_asterisk
, "*");
62 SCM_SYMBOL (sym_null
, "%null-pointer");
63 SCM_SYMBOL (sym_null_pointer_error
, "null-pointer-error");
65 /* The cell representing the null pointer. */
66 static SCM null_pointer
;
69 /* Raise a null pointer dereference error. */
71 null_pointer_error (const char *func_name
)
73 scm_error (sym_null_pointer_error
, func_name
,
74 "null pointer dereference", SCM_EOL
, SCM_EOL
);
78 static SCM
cif_to_procedure (SCM cif
, SCM func_ptr
);
81 static SCM pointer_weak_refs
= SCM_BOOL_F
;
85 register_weak_reference (SCM from
, SCM to
)
87 scm_weak_table_putq_x (pointer_weak_refs
, from
, to
);
91 pointer_finalizer_trampoline (void *ptr
, void *data
)
93 scm_t_pointer_finalizer finalizer
= data
;
94 finalizer (SCM_POINTER_VALUE (SCM_PACK_POINTER (ptr
)));
97 SCM_DEFINE (scm_pointer_p
, "pointer?", 1, 0, 0,
99 "Return @code{#t} if @var{obj} is a pointer object, "
100 "@code{#f} otherwise.\n")
101 #define FUNC_NAME s_scm_pointer_p
103 return scm_from_bool (SCM_POINTER_P (obj
));
107 SCM_DEFINE (scm_make_pointer
, "make-pointer", 1, 1, 0,
108 (SCM address
, SCM finalizer
),
109 "Return a foreign pointer object pointing to @var{address}. "
110 "If @var{finalizer} is passed, it should be a pointer to a "
111 "one-argument C function that will be called when the pointer "
112 "object becomes unreachable.")
113 #define FUNC_NAME s_scm_make_pointer
116 scm_t_uintptr c_address
;
118 c_address
= scm_to_uintptr_t (address
);
119 if (SCM_UNBNDP (finalizer
))
123 SCM_VALIDATE_POINTER (2, finalizer
);
124 c_finalizer
= SCM_POINTER_VALUE (finalizer
);
127 return scm_from_pointer ((void *) c_address
, c_finalizer
);
132 scm_to_pointer (SCM pointer
)
133 #define FUNC_NAME "scm_to_pointer"
135 SCM_VALIDATE_POINTER (1, pointer
);
136 return SCM_POINTER_VALUE (pointer
);
141 scm_from_pointer (void *ptr
, scm_t_pointer_finalizer finalizer
)
145 if (ptr
== NULL
&& finalizer
== NULL
)
149 ret
= scm_cell (scm_tc7_pointer
, (scm_t_bits
) ptr
);
152 scm_i_set_finalizer (SCM2PTR (ret
), pointer_finalizer_trampoline
,
159 SCM_DEFINE (scm_pointer_address
, "pointer-address", 1, 0, 0,
161 "Return the numerical value of @var{pointer}.")
162 #define FUNC_NAME s_scm_pointer_address
164 SCM_VALIDATE_POINTER (1, pointer
);
166 return scm_from_uintptr_t ((scm_t_uintptr
) SCM_POINTER_VALUE (pointer
));
170 SCM_DEFINE (scm_pointer_to_scm
, "pointer->scm", 1, 0, 0,
172 "Unsafely cast @var{pointer} to a Scheme object.\n"
173 "Cross your fingers!")
174 #define FUNC_NAME s_scm_pointer_to_scm
176 SCM_VALIDATE_POINTER (1, pointer
);
178 return SCM_PACK ((scm_t_bits
) SCM_POINTER_VALUE (pointer
));
182 SCM_DEFINE (scm_scm_to_pointer
, "scm->pointer", 1, 0, 0,
184 "Return a foreign pointer object with the @code{object-address}\n"
186 #define FUNC_NAME s_scm_scm_to_pointer
190 ret
= scm_from_pointer ((void*) SCM_UNPACK (scm
), NULL
);
191 if (SCM_HEAP_OBJECT_P (ret
))
192 register_weak_reference (ret
, scm
);
198 SCM_DEFINE (scm_pointer_to_bytevector
, "pointer->bytevector", 2, 2, 0,
199 (SCM pointer
, SCM len
, SCM offset
, SCM uvec_type
),
200 "Return a bytevector aliasing the @var{len} bytes pointed\n"
201 "to by @var{pointer}.\n\n"
202 "The user may specify an alternate default interpretation for\n"
203 "the memory by passing the @var{uvec_type} argument, to indicate\n"
204 "that the memory is an array of elements of that type.\n"
205 "@var{uvec_type} should be something that\n"
206 "@code{uniform-vector-element-type} would return, like @code{f32}\n"
208 "When @var{offset} is passed, it specifies the offset in bytes\n"
209 "relative to @var{pointer} of the memory region aliased by the\n"
210 "returned bytevector.")
211 #define FUNC_NAME s_scm_pointer_to_bytevector
215 size_t boffset
, blen
;
216 scm_t_array_element_type btype
;
218 SCM_VALIDATE_POINTER (1, pointer
);
219 ptr
= SCM_POINTER_VALUE (pointer
);
221 if (SCM_UNLIKELY (ptr
== NULL
))
222 null_pointer_error (FUNC_NAME
);
224 if (SCM_UNBNDP (uvec_type
))
225 btype
= SCM_ARRAY_ELEMENT_TYPE_VU8
;
229 for (i
= 0; i
<= SCM_ARRAY_ELEMENT_TYPE_LAST
; i
++)
230 if (scm_is_eq (uvec_type
, scm_i_array_element_types
[i
]))
234 case SCM_ARRAY_ELEMENT_TYPE_VU8
:
235 case SCM_ARRAY_ELEMENT_TYPE_U8
:
236 case SCM_ARRAY_ELEMENT_TYPE_S8
:
237 case SCM_ARRAY_ELEMENT_TYPE_U16
:
238 case SCM_ARRAY_ELEMENT_TYPE_S16
:
239 case SCM_ARRAY_ELEMENT_TYPE_U32
:
240 case SCM_ARRAY_ELEMENT_TYPE_S32
:
241 case SCM_ARRAY_ELEMENT_TYPE_U64
:
242 case SCM_ARRAY_ELEMENT_TYPE_S64
:
243 case SCM_ARRAY_ELEMENT_TYPE_F32
:
244 case SCM_ARRAY_ELEMENT_TYPE_F64
:
245 case SCM_ARRAY_ELEMENT_TYPE_C32
:
246 case SCM_ARRAY_ELEMENT_TYPE_C64
:
250 scm_wrong_type_arg_msg (FUNC_NAME
, SCM_ARG1
, uvec_type
,
251 "uniform vector type");
255 if (SCM_UNBNDP (offset
))
258 boffset
= scm_to_size_t (offset
);
260 blen
= scm_to_size_t (len
);
262 ret
= scm_c_take_typed_bytevector ((signed char *) ptr
+ boffset
,
263 blen
, btype
, pointer
);
269 SCM_DEFINE (scm_bytevector_to_pointer
, "bytevector->pointer", 1, 1, 0,
270 (SCM bv
, SCM offset
),
271 "Return a pointer pointer aliasing the memory pointed to by\n"
272 "@var{bv} or @var{offset} bytes after @var{bv} when @var{offset}\n"
274 #define FUNC_NAME s_scm_bytevector_to_pointer
280 SCM_VALIDATE_BYTEVECTOR (1, bv
);
281 ptr
= SCM_BYTEVECTOR_CONTENTS (bv
);
283 if (SCM_UNBNDP (offset
))
286 boffset
= scm_to_unsigned_integer (offset
, 0,
287 SCM_BYTEVECTOR_LENGTH (bv
) - 1);
289 ret
= scm_from_pointer (ptr
+ boffset
, NULL
);
290 register_weak_reference (ret
, bv
);
295 SCM_DEFINE (scm_set_pointer_finalizer_x
, "set-pointer-finalizer!", 2, 0, 0,
296 (SCM pointer
, SCM finalizer
),
297 "Arrange for the C procedure wrapped by @var{finalizer} to be\n"
298 "called on the pointer wrapped by @var{pointer} when @var{pointer}\n"
299 "becomes unreachable. Note: the C procedure should not call into\n"
300 "Scheme. If you need a Scheme finalizer, use guardians.")
301 #define FUNC_NAME s_scm_set_pointer_finalizer_x
303 SCM_VALIDATE_POINTER (1, pointer
);
304 SCM_VALIDATE_POINTER (2, finalizer
);
306 scm_i_add_finalizer (SCM2PTR (pointer
), pointer_finalizer_trampoline
,
307 SCM_POINTER_VALUE (finalizer
));
309 return SCM_UNSPECIFIED
;
314 scm_i_pointer_print (SCM pointer
, SCM port
, scm_print_state
*pstate
)
316 scm_puts_unlocked ("#<pointer 0x", port
);
317 scm_uintprint (scm_to_uintptr_t (scm_pointer_address (pointer
)), 16, port
);
318 scm_putc_unlocked ('>', port
);
322 /* Non-primitive helpers functions. These procedures could be
323 implemented in terms of the primitives above but would be inefficient
324 (heap allocation overhead, Scheme/C round trips, etc.) */
326 SCM_DEFINE (scm_dereference_pointer
, "dereference-pointer", 1, 0, 0,
328 "Assuming @var{pointer} points to a memory region that\n"
329 "holds a pointer, return this pointer.")
330 #define FUNC_NAME s_scm_dereference_pointer
332 SCM_VALIDATE_POINTER (1, pointer
);
334 return scm_from_pointer (* (void **) SCM_POINTER_VALUE (pointer
), NULL
);
338 SCM_DEFINE (scm_string_to_pointer
, "string->pointer", 1, 1, 0,
339 (SCM string
, SCM encoding
),
340 "Return a foreign pointer to a nul-terminated copy of\n"
341 "@var{string} in the given @var{encoding}, defaulting to\n"
342 "the current locale encoding. The C string is freed when\n"
343 "the returned foreign pointer becomes unreachable.\n\n"
344 "This is the Scheme equivalent of @code{scm_to_stringn}.")
345 #define FUNC_NAME s_scm_string_to_pointer
347 SCM_VALIDATE_STRING (1, string
);
349 /* XXX: Finalizers slow down libgc; they could be avoided if
350 `scm_to_string' & co. were able to use libgc-allocated memory. */
352 if (SCM_UNBNDP (encoding
))
353 return scm_from_pointer (scm_to_locale_string (string
), free
);
359 SCM_VALIDATE_STRING (2, encoding
);
361 enc
= scm_to_locale_string (encoding
);
362 scm_dynwind_begin (0);
363 scm_dynwind_free (enc
);
365 ret
= scm_from_pointer
366 (scm_to_stringn (string
, NULL
, enc
,
367 scm_i_default_port_conversion_handler ()),
377 SCM_DEFINE (scm_pointer_to_string
, "pointer->string", 1, 2, 0,
378 (SCM pointer
, SCM length
, SCM encoding
),
379 "Return the string representing the C string pointed to by\n"
380 "@var{pointer}. If @var{length} is omitted or @code{-1}, the\n"
381 "string is assumed to be nul-terminated. Otherwise\n"
382 "@var{length} is the number of bytes in memory pointed to by\n"
383 "@var{pointer}. The C string is assumed to be in the given\n"
384 "@var{encoding}, defaulting to the current locale encoding.\n\n"
385 "This is the Scheme equivalent of @code{scm_from_stringn}.")
386 #define FUNC_NAME s_scm_pointer_to_string
390 SCM_VALIDATE_POINTER (1, pointer
);
392 if (SCM_UNBNDP (length
)
393 || scm_is_true (scm_eqv_p (length
, scm_from_int (-1))))
396 len
= scm_to_size_t (length
);
398 if (SCM_UNBNDP (encoding
))
399 return scm_from_locale_stringn (SCM_POINTER_VALUE (pointer
), len
);
405 SCM_VALIDATE_STRING (3, encoding
);
407 enc
= scm_to_locale_string (encoding
);
408 scm_dynwind_begin (0);
409 scm_dynwind_free (enc
);
411 ret
= scm_from_stringn (SCM_POINTER_VALUE (pointer
), len
, enc
,
412 scm_i_default_port_conversion_handler ());
423 SCM_DEFINE (scm_alignof
, "alignof", 1, 0, 0, (SCM type
),
424 "Return the alignment of @var{type}, in bytes.\n\n"
425 "@var{type} should be a valid C type, like @code{int}.\n"
426 "Alternately @var{type} may be the symbol @code{*}, in which\n"
427 "case the alignment of a pointer is returned. @var{type} may\n"
428 "also be a list of types, in which case the alignment of a\n"
429 "@code{struct} with ABI-conventional packing is returned.")
430 #define FUNC_NAME s_scm_alignof
432 if (SCM_I_INUMP (type
))
434 switch (SCM_I_INUM (type
))
436 case SCM_FOREIGN_TYPE_FLOAT
:
437 return scm_from_size_t (alignof_type (float));
438 case SCM_FOREIGN_TYPE_DOUBLE
:
439 return scm_from_size_t (alignof_type (double));
440 case SCM_FOREIGN_TYPE_UINT8
:
441 return scm_from_size_t (alignof_type (scm_t_uint8
));
442 case SCM_FOREIGN_TYPE_INT8
:
443 return scm_from_size_t (alignof_type (scm_t_int8
));
444 case SCM_FOREIGN_TYPE_UINT16
:
445 return scm_from_size_t (alignof_type (scm_t_uint16
));
446 case SCM_FOREIGN_TYPE_INT16
:
447 return scm_from_size_t (alignof_type (scm_t_int16
));
448 case SCM_FOREIGN_TYPE_UINT32
:
449 return scm_from_size_t (alignof_type (scm_t_uint32
));
450 case SCM_FOREIGN_TYPE_INT32
:
451 return scm_from_size_t (alignof_type (scm_t_int32
));
452 case SCM_FOREIGN_TYPE_UINT64
:
453 return scm_from_size_t (alignof_type (scm_t_uint64
));
454 case SCM_FOREIGN_TYPE_INT64
:
455 return scm_from_size_t (alignof_type (scm_t_int64
));
457 scm_wrong_type_arg (FUNC_NAME
, 1, type
);
460 else if (scm_is_eq (type
, sym_asterisk
))
462 return scm_from_size_t (alignof_type (void*));
463 else if (scm_is_pair (type
))
465 /* TYPE is a structure. Section 3-3 of the i386, x86_64, PowerPC,
466 and SPARC P.S. of the System V ABI all say: "Aggregates
467 (structures and arrays) and unions assume the alignment of
468 their most strictly aligned component." */
471 for (max
= 0; scm_is_pair (type
); type
= SCM_CDR (type
))
475 align
= scm_to_size_t (scm_alignof (SCM_CAR (type
)));
480 return scm_from_size_t (max
);
483 scm_wrong_type_arg (FUNC_NAME
, 1, type
);
487 SCM_DEFINE (scm_sizeof
, "sizeof", 1, 0, 0, (SCM type
),
488 "Return the size of @var{type}, in bytes.\n\n"
489 "@var{type} should be a valid C type, like @code{int}.\n"
490 "Alternately @var{type} may be the symbol @code{*}, in which\n"
491 "case the size of a pointer is returned. @var{type} may also\n"
492 "be a list of types, in which case the size of a @code{struct}\n"
493 "with ABI-conventional packing is returned.")
494 #define FUNC_NAME s_scm_sizeof
496 if (SCM_I_INUMP (type
))
498 switch (SCM_I_INUM (type
))
500 case SCM_FOREIGN_TYPE_FLOAT
:
501 return scm_from_size_t (sizeof (float));
502 case SCM_FOREIGN_TYPE_DOUBLE
:
503 return scm_from_size_t (sizeof (double));
504 case SCM_FOREIGN_TYPE_UINT8
:
505 return scm_from_size_t (sizeof (scm_t_uint8
));
506 case SCM_FOREIGN_TYPE_INT8
:
507 return scm_from_size_t (sizeof (scm_t_int8
));
508 case SCM_FOREIGN_TYPE_UINT16
:
509 return scm_from_size_t (sizeof (scm_t_uint16
));
510 case SCM_FOREIGN_TYPE_INT16
:
511 return scm_from_size_t (sizeof (scm_t_int16
));
512 case SCM_FOREIGN_TYPE_UINT32
:
513 return scm_from_size_t (sizeof (scm_t_uint32
));
514 case SCM_FOREIGN_TYPE_INT32
:
515 return scm_from_size_t (sizeof (scm_t_int32
));
516 case SCM_FOREIGN_TYPE_UINT64
:
517 return scm_from_size_t (sizeof (scm_t_uint64
));
518 case SCM_FOREIGN_TYPE_INT64
:
519 return scm_from_size_t (sizeof (scm_t_int64
));
521 scm_wrong_type_arg (FUNC_NAME
, 1, type
);
524 else if (scm_is_eq (type
, sym_asterisk
))
526 return scm_from_size_t (sizeof (void*));
527 else if (scm_is_pair (type
))
531 size_t align
= scm_to_size_t (scm_alignof(type
));
532 while (scm_is_pair (type
))
534 off
= ROUND_UP (off
, scm_to_size_t (scm_alignof (scm_car (type
))));
535 off
+= scm_to_size_t (scm_sizeof (scm_car (type
)));
536 type
= scm_cdr (type
);
538 return scm_from_size_t (ROUND_UP(off
, align
));
541 scm_wrong_type_arg (FUNC_NAME
, 1, type
);
546 /* return 1 on success, 0 on failure */
548 parse_ffi_type (SCM type
, int return_p
, long *n_structs
, long *n_struct_elts
)
550 if (SCM_I_INUMP (type
))
552 if ((SCM_I_INUM (type
) < 0 )
553 || (SCM_I_INUM (type
) > SCM_FOREIGN_TYPE_LAST
))
555 else if (SCM_I_INUM (type
) == SCM_FOREIGN_TYPE_VOID
&& !return_p
)
560 else if (scm_is_eq (type
, sym_asterisk
))
567 len
= scm_ilength (type
);
572 if (!parse_ffi_type (scm_car (type
), 0, n_structs
, n_struct_elts
))
575 type
= scm_cdr (type
);
583 fill_ffi_type (SCM type
, ffi_type
*ftype
, ffi_type
***type_ptrs
,
586 if (SCM_I_INUMP (type
))
588 switch (SCM_I_INUM (type
))
590 case SCM_FOREIGN_TYPE_FLOAT
:
591 *ftype
= ffi_type_float
;
593 case SCM_FOREIGN_TYPE_DOUBLE
:
594 *ftype
= ffi_type_double
;
596 case SCM_FOREIGN_TYPE_UINT8
:
597 *ftype
= ffi_type_uint8
;
599 case SCM_FOREIGN_TYPE_INT8
:
600 *ftype
= ffi_type_sint8
;
602 case SCM_FOREIGN_TYPE_UINT16
:
603 *ftype
= ffi_type_uint16
;
605 case SCM_FOREIGN_TYPE_INT16
:
606 *ftype
= ffi_type_sint16
;
608 case SCM_FOREIGN_TYPE_UINT32
:
609 *ftype
= ffi_type_uint32
;
611 case SCM_FOREIGN_TYPE_INT32
:
612 *ftype
= ffi_type_sint32
;
614 case SCM_FOREIGN_TYPE_UINT64
:
615 *ftype
= ffi_type_uint64
;
617 case SCM_FOREIGN_TYPE_INT64
:
618 *ftype
= ffi_type_sint64
;
620 case SCM_FOREIGN_TYPE_VOID
:
621 *ftype
= ffi_type_void
;
624 scm_wrong_type_arg_msg ("pointer->procedure", 0, type
,
628 else if (scm_is_eq (type
, sym_asterisk
))
631 *ftype
= ffi_type_pointer
;
638 len
= scm_ilength (type
);
641 ftype
->alignment
= 0;
642 ftype
->type
= FFI_TYPE_STRUCT
;
643 ftype
->elements
= *type_ptrs
;
644 *type_ptrs
+= len
+ 1;
646 for (i
= 0; i
< len
; i
++)
648 ftype
->elements
[i
] = *types
;
650 fill_ffi_type (scm_car (type
), ftype
->elements
[i
],
652 type
= scm_cdr (type
);
654 ftype
->elements
[i
] = NULL
;
658 /* Return a "cif" (call interface) for the given RETURN_TYPE and
661 make_cif (SCM return_type
, SCM arg_types
, const char *caller
)
662 #define FUNC_NAME caller
665 long i
, nargs
, n_structs
, n_struct_elts
;
669 ffi_type
**type_ptrs
;
672 nargs
= scm_ilength (arg_types
);
673 SCM_ASSERT (nargs
>= 0, arg_types
, 3, FUNC_NAME
);
674 /* fixme: assert nargs < 1<<32 */
675 n_structs
= n_struct_elts
= 0;
677 /* For want of talloc, we're going to have to do this in two passes: first we
678 figure out how much memory is needed for all types, then we allocate the
679 cif and the types all in one block. */
680 if (!parse_ffi_type (return_type
, 1, &n_structs
, &n_struct_elts
))
681 scm_wrong_type_arg (FUNC_NAME
, 1, return_type
);
682 for (walk
= arg_types
; scm_is_pair (walk
); walk
= scm_cdr (walk
))
683 if (!parse_ffi_type (scm_car (walk
), 0, &n_structs
, &n_struct_elts
))
684 scm_wrong_type_arg (FUNC_NAME
, 3, scm_car (walk
));
686 /* the memory: with space for the cif itself */
687 cif_len
= sizeof (ffi_cif
);
689 /* then ffi_type pointers: one for each arg, one for each struct
690 element, and one for each struct (for null-termination) */
691 cif_len
= (ROUND_UP (cif_len
, alignof_type (void *))
692 + (nargs
+ n_structs
+ n_struct_elts
)*sizeof(void*));
694 /* then the ffi_type structs themselves, one per arg and struct element, and
695 one for the return val */
696 cif_len
= (ROUND_UP (cif_len
, alignof_type (ffi_type
))
697 + (nargs
+ n_struct_elts
+ 1)*sizeof(ffi_type
));
699 mem
= scm_gc_malloc_pointerless (cif_len
, "foreign");
700 /* ensure all the memory is initialized, even the holes */
701 memset (mem
, 0, cif_len
);
702 cif
= (ffi_cif
*) mem
;
704 /* reuse cif_len to walk through the mem */
705 cif_len
= ROUND_UP (sizeof (ffi_cif
), alignof_type (void *));
706 type_ptrs
= (ffi_type
**)(mem
+ cif_len
);
707 cif_len
= ROUND_UP (cif_len
708 + (nargs
+ n_structs
+ n_struct_elts
)*sizeof(void*),
709 alignof_type (ffi_type
));
710 types
= (ffi_type
*)(mem
+ cif_len
);
712 /* whew. now knit the pointers together. */
713 cif
->rtype
= types
++;
714 fill_ffi_type (return_type
, cif
->rtype
, &type_ptrs
, &types
);
715 cif
->arg_types
= type_ptrs
;
717 for (walk
= arg_types
, i
= 0; scm_is_pair (walk
); walk
= scm_cdr (walk
), i
++)
719 cif
->arg_types
[i
] = types
++;
720 fill_ffi_type (scm_car (walk
), cif
->arg_types
[i
], &type_ptrs
, &types
);
723 /* round out the cif, and we're done. */
724 cif
->abi
= FFI_DEFAULT_ABI
;
729 if (FFI_OK
!= ffi_prep_cif (cif
, FFI_DEFAULT_ABI
, cif
->nargs
, cif
->rtype
,
731 SCM_MISC_ERROR ("ffi_prep_cif failed", SCM_EOL
);
737 SCM_DEFINE (scm_pointer_to_procedure
, "pointer->procedure", 3, 0, 0,
738 (SCM return_type
, SCM func_ptr
, SCM arg_types
),
739 "Make a foreign function.\n\n"
740 "Given the foreign void pointer @var{func_ptr}, its argument and\n"
741 "return types @var{arg_types} and @var{return_type}, return a\n"
742 "procedure that will pass arguments to the foreign function\n"
743 "and return appropriate values.\n\n"
744 "@var{arg_types} should be a list of foreign types.\n"
745 "@code{return_type} should be a foreign type.")
746 #define FUNC_NAME s_scm_pointer_to_procedure
750 SCM_VALIDATE_POINTER (2, func_ptr
);
752 cif
= make_cif (return_type
, arg_types
, FUNC_NAME
);
754 return cif_to_procedure (scm_from_pointer (cif
, NULL
), func_ptr
);
760 /* Pre-generate trampolines for less than 10 arguments. */
762 #ifdef WORDS_BIGENDIAN
763 #define OBJCODE_HEADER(M) M (0), M (0), M (0), M (8), M (0), M (0), M (0), M (40)
764 #define META_HEADER(M) M (0), M (0), M (0), M (32), M (0), M (0), M (0), M (0)
766 #define OBJCODE_HEADER(M) M (8), M (0), M (0), M (0), M (40), M (0), M (0), M (0)
767 #define META_HEADER(M) M (32), M (0), M (0), M (0), M (0), M (0), M (0), M (0)
770 #define GEN_CODE(M, nreq) \
771 OBJCODE_HEADER (M), \
772 /* 0 */ M (scm_op_assert_nargs_ee), M (0), M (nreq), /* assert number of args */ \
773 /* 3 */ M (scm_op_object_ref), M (0), /* push the pair with the cif and the function pointer */ \
774 /* 5 */ M (scm_op_foreign_call), M (nreq), /* and call (will return value as well) */ \
775 /* 7 */ M (scm_op_nop), \
776 /* 8 */ META (M, 3, 7, nreq)
778 #define META(M, start, end, nreq) \
780 /* 0 */ M (scm_op_make_eol), /* bindings */ \
781 /* 1 */ M (scm_op_make_eol), /* sources */ \
782 /* 2 */ M (scm_op_make_int8), M (start), M (scm_op_make_int8), M (end), /* arity: from ip N to ip N */ \
783 /* 6 */ M (scm_op_make_int8), M (nreq), /* the arity is N required args */ \
784 /* 8 */ M (scm_op_list), M (0), M (3), /* make a list of those 3 vals */ \
785 /* 11 */ M (scm_op_list), M (0), M (1), /* and the arities will be a list of that one list */ \
786 /* 14 */ M (scm_op_load_symbol), M (0), M (0), M (4), M ('n'), M ('a'), M ('M'), M ('e'), /* `name' */ \
787 /* 22 */ M (scm_op_object_ref), M (1), /* the name from the object table */ \
788 /* 24 */ M (scm_op_cons), /* make a pair for the properties */ \
789 /* 25 */ M (scm_op_list), M (0), M (4), /* pack bindings, sources, and arities into list */ \
790 /* 28 */ M (scm_op_return), /* and return */ \
791 /* 29 */ M (scm_op_nop), M (scm_op_nop), M (scm_op_nop) \
794 #define M_STATIC(x) (x)
795 #define CODE(nreq) GEN_CODE (M_STATIC, nreq)
799 scm_t_uint64 dummy
; /* ensure 8-byte alignment; perhaps there's a better way */
800 const scm_t_uint8 bytes
[10 * (sizeof (struct scm_objcode
) + 8
801 + sizeof (struct scm_objcode
) + 32)];
805 CODE (0), CODE (1), CODE (2), CODE (3), CODE (4),
806 CODE (5), CODE (6), CODE (7), CODE (8), CODE (9)
811 make_objcode_trampoline (unsigned int nargs
)
813 const int size
= sizeof (struct scm_objcode
) + 8
814 + sizeof (struct scm_objcode
) + 32;
815 SCM bytecode
= scm_c_make_bytevector (size
);
816 scm_t_uint8
*bytes
= (scm_t_uint8
*) SCM_BYTEVECTOR_CONTENTS (bytecode
);
819 #define M_DYNAMIC(x) (bytes[i++] = (x))
820 GEN_CODE (M_DYNAMIC
, nargs
);
824 scm_syserror ("make_objcode_trampoline");
825 return scm_bytecode_to_objcode (bytecode
, SCM_UNDEFINED
);
832 #undef OBJCODE_HEADER
836 (defun generate-objcode-cells (n)
837 "Generate objcode cells for up to N arguments"
842 (format " { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + %d) },\n"
843 (* (+ 4 4 8 4 4 32) i)))
844 (insert " { SCM_BOOL_F, SCM_PACK (0) },\n")
847 #define STATIC_OBJCODE_TAG \
848 SCM_PACK (SCM_MAKE_OBJCODE_TAG (SCM_OBJCODE_TYPE_STATIC, 0))
852 scm_t_uint64 dummy
; /* alignment */
853 scm_t_cell cells
[10 * 2]; /* 10 double cells */
856 /* C-u 1 0 M-x generate-objcode-cells RET */
858 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 0) },
859 { SCM_BOOL_F
, SCM_PACK (0) },
860 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 56) },
861 { SCM_BOOL_F
, SCM_PACK (0) },
862 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 112) },
863 { SCM_BOOL_F
, SCM_PACK (0) },
864 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 168) },
865 { SCM_BOOL_F
, SCM_PACK (0) },
866 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 224) },
867 { SCM_BOOL_F
, SCM_PACK (0) },
868 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 280) },
869 { SCM_BOOL_F
, SCM_PACK (0) },
870 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 336) },
871 { SCM_BOOL_F
, SCM_PACK (0) },
872 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 392) },
873 { SCM_BOOL_F
, SCM_PACK (0) },
874 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 448) },
875 { SCM_BOOL_F
, SCM_PACK (0) },
876 { STATIC_OBJCODE_TAG
, SCM_PACK (raw_bytecode
.bytes
+ 504) },
877 { SCM_BOOL_F
, SCM_PACK (0) }
881 static const SCM objcode_trampolines
[10] = {
882 SCM_PACK (objcode_cells
.cells
+0),
883 SCM_PACK (objcode_cells
.cells
+2),
884 SCM_PACK (objcode_cells
.cells
+4),
885 SCM_PACK (objcode_cells
.cells
+6),
886 SCM_PACK (objcode_cells
.cells
+8),
887 SCM_PACK (objcode_cells
.cells
+10),
888 SCM_PACK (objcode_cells
.cells
+12),
889 SCM_PACK (objcode_cells
.cells
+14),
890 SCM_PACK (objcode_cells
.cells
+16),
891 SCM_PACK (objcode_cells
.cells
+18),
894 static SCM large_objcode_trampolines
= SCM_UNDEFINED
;
895 static scm_i_pthread_mutex_t large_objcode_trampolines_mutex
=
896 SCM_I_PTHREAD_MUTEX_INITIALIZER
;
899 get_objcode_trampoline (unsigned int nargs
)
904 objcode
= objcode_trampolines
[nargs
];
905 else if (nargs
< 128)
907 scm_i_scm_pthread_mutex_lock (&large_objcode_trampolines_mutex
);
908 if (SCM_UNBNDP (large_objcode_trampolines
))
909 large_objcode_trampolines
= scm_c_make_vector (128, SCM_UNDEFINED
);
910 objcode
= scm_c_vector_ref (large_objcode_trampolines
, nargs
);
911 if (SCM_UNBNDP (objcode
))
912 scm_c_vector_set_x (large_objcode_trampolines
, nargs
,
913 objcode
= make_objcode_trampoline (nargs
));
914 scm_i_pthread_mutex_unlock (&large_objcode_trampolines_mutex
);
917 scm_misc_error ("make-foreign-function", "args >= 128 currently unimplemented",
924 cif_to_procedure (SCM cif
, SCM func_ptr
)
927 SCM objcode
, table
, ret
;
929 c_cif
= (ffi_cif
*) SCM_POINTER_VALUE (cif
);
930 objcode
= get_objcode_trampoline (c_cif
->nargs
);
932 table
= scm_c_make_vector (2, SCM_UNDEFINED
);
933 SCM_SIMPLE_VECTOR_SET (table
, 0, scm_cons (cif
, func_ptr
));
934 SCM_SIMPLE_VECTOR_SET (table
, 1, SCM_BOOL_F
); /* name */
935 ret
= scm_make_program (objcode
, table
, SCM_BOOL_F
);
940 /* Set *LOC to the foreign representation of X with TYPE. */
942 unpack (const ffi_type
*type
, void *loc
, SCM x
, int return_value_p
)
943 #define FUNC_NAME "scm_i_foreign_call"
948 *(float *) loc
= scm_to_double (x
);
950 case FFI_TYPE_DOUBLE
:
951 *(double *) loc
= scm_to_double (x
);
954 /* For integer return values smaller than `int', libffi expects the
955 result in an `ffi_arg'-long buffer. */
959 *(ffi_arg
*) loc
= scm_to_uint8 (x
);
961 *(scm_t_uint8
*) loc
= scm_to_uint8 (x
);
965 *(ffi_arg
*) loc
= scm_to_int8 (x
);
967 *(scm_t_int8
*) loc
= scm_to_int8 (x
);
969 case FFI_TYPE_UINT16
:
971 *(ffi_arg
*) loc
= scm_to_uint16 (x
);
973 *(scm_t_uint16
*) loc
= scm_to_uint16 (x
);
975 case FFI_TYPE_SINT16
:
977 *(ffi_arg
*) loc
= scm_to_int16 (x
);
979 *(scm_t_int16
*) loc
= scm_to_int16 (x
);
981 case FFI_TYPE_UINT32
:
983 *(ffi_arg
*) loc
= scm_to_uint32 (x
);
985 *(scm_t_uint32
*) loc
= scm_to_uint32 (x
);
987 case FFI_TYPE_SINT32
:
989 *(ffi_arg
*) loc
= scm_to_int32 (x
);
991 *(scm_t_int32
*) loc
= scm_to_int32 (x
);
993 case FFI_TYPE_UINT64
:
994 *(scm_t_uint64
*) loc
= scm_to_uint64 (x
);
996 case FFI_TYPE_SINT64
:
997 *(scm_t_int64
*) loc
= scm_to_int64 (x
);
999 case FFI_TYPE_STRUCT
:
1000 SCM_VALIDATE_POINTER (1, x
);
1001 memcpy (loc
, SCM_POINTER_VALUE (x
), type
->size
);
1003 case FFI_TYPE_POINTER
:
1004 SCM_VALIDATE_POINTER (1, x
);
1005 *(void **) loc
= SCM_POINTER_VALUE (x
);
1016 /* Return a Scheme representation of the foreign value at LOC of type
1017 TYPE. When RETURN_VALUE_P is true, LOC is assumed to point to a
1018 return value buffer; otherwise LOC is assumed to point to an
1021 pack (const ffi_type
* type
, const void *loc
, int return_value_p
)
1026 return SCM_UNSPECIFIED
;
1027 case FFI_TYPE_FLOAT
:
1028 return scm_from_double (*(float *) loc
);
1029 case FFI_TYPE_DOUBLE
:
1030 return scm_from_double (*(double *) loc
);
1032 /* For integer return values smaller than `int', libffi stores the
1033 result in an `ffi_arg'-long buffer, of which only the
1034 significant bits must be kept---hence the pair of casts below.
1035 See <http://thread.gmane.org/gmane.comp.lib.ffi.general/406>
1038 case FFI_TYPE_UINT8
:
1040 return scm_from_uint8 ((scm_t_uint8
) *(ffi_arg
*) loc
);
1042 return scm_from_uint8 (* (scm_t_uint8
*) loc
);
1043 case FFI_TYPE_SINT8
:
1045 return scm_from_int8 ((scm_t_int8
) *(ffi_arg
*) loc
);
1047 return scm_from_int8 (* (scm_t_int8
*) loc
);
1048 case FFI_TYPE_UINT16
:
1050 return scm_from_uint16 ((scm_t_uint16
) *(ffi_arg
*) loc
);
1052 return scm_from_uint16 (* (scm_t_uint16
*) loc
);
1053 case FFI_TYPE_SINT16
:
1055 return scm_from_int16 ((scm_t_int16
) *(ffi_arg
*) loc
);
1057 return scm_from_int16 (* (scm_t_int16
*) loc
);
1058 case FFI_TYPE_UINT32
:
1060 return scm_from_uint32 ((scm_t_uint32
) *(ffi_arg
*) loc
);
1062 return scm_from_uint32 (* (scm_t_uint32
*) loc
);
1063 case FFI_TYPE_SINT32
:
1065 return scm_from_int32 ((scm_t_int32
) *(ffi_arg
*) loc
);
1067 return scm_from_int32 (* (scm_t_int32
*) loc
);
1068 case FFI_TYPE_UINT64
:
1069 return scm_from_uint64 (*(scm_t_uint64
*) loc
);
1070 case FFI_TYPE_SINT64
:
1071 return scm_from_int64 (*(scm_t_int64
*) loc
);
1073 case FFI_TYPE_STRUCT
:
1075 void *mem
= scm_gc_malloc_pointerless (type
->size
, "foreign");
1076 memcpy (mem
, loc
, type
->size
);
1077 return scm_from_pointer (mem
, NULL
);
1079 case FFI_TYPE_POINTER
:
1080 return scm_from_pointer (*(void **) loc
, NULL
);
1088 scm_i_foreign_call (SCM foreign
, const SCM
*argv
)
1090 /* FOREIGN is the pair that cif_to_procedure set as the 0th element of the
1093 void (*func
) (void);
1101 cif
= SCM_POINTER_VALUE (SCM_CAR (foreign
));
1102 func
= SCM_POINTER_VALUE (SCM_CDR (foreign
));
1104 /* Argument pointers. */
1105 args
= alloca (sizeof (void *) * cif
->nargs
);
1107 /* Compute the worst-case amount of memory needed to store all the argument
1108 values. Note: as of libffi 3.0.9 `cif->bytes' is undocumented and is zero,
1109 so it can't be used for that purpose. */
1110 for (i
= 0, arg_size
= 0; i
< cif
->nargs
; i
++)
1111 arg_size
+= cif
->arg_types
[i
]->size
+ cif
->arg_types
[i
]->alignment
- 1;
1113 /* Space for argument values, followed by return value. */
1114 data
= alloca (arg_size
+ cif
->rtype
->size
1115 + max (sizeof (void *), cif
->rtype
->alignment
));
1117 /* Unpack ARGV to native values, setting ARGV pointers. */
1118 for (i
= 0, off
= 0;
1120 off
= (scm_t_uint8
*) args
[i
] - data
+ cif
->arg_types
[i
]->size
,
1123 /* Suitably align the storage area for argument I. */
1124 args
[i
] = (void *) ROUND_UP ((scm_t_uintptr
) data
+ off
,
1125 cif
->arg_types
[i
]->alignment
);
1126 assert ((scm_t_uintptr
) args
[i
] % cif
->arg_types
[i
]->alignment
== 0);
1127 unpack (cif
->arg_types
[i
], args
[i
], argv
[i
], 0);
1130 /* Prepare space for the return value. On some platforms, such as
1131 `armv5tel-*-linux-gnueabi', the return value has to be at least
1132 word-aligned, even if its type doesn't have any alignment requirement as is
1133 the case with `char'. */
1134 rvalue
= (void *) ROUND_UP ((scm_t_uintptr
) data
+ off
,
1135 max (sizeof (void *), cif
->rtype
->alignment
));
1138 ffi_call (cif
, func
, rvalue
, args
);
1140 return pack (cif
->rtype
, rvalue
, 1);
1144 /* Function pointers aka. "callbacks" or "closures". */
1148 /* Trampoline to invoke a libffi closure that wraps a Scheme
1151 invoke_closure (ffi_cif
*cif
, void *ret
, void **args
, void *data
)
1154 SCM proc
, *argv
, result
;
1156 proc
= SCM_PACK_POINTER (data
);
1158 argv
= alloca (cif
->nargs
* sizeof (*argv
));
1160 /* Pack ARGS to SCM values, setting ARGV pointers. */
1161 for (i
= 0; i
< cif
->nargs
; i
++)
1162 argv
[i
] = pack (cif
->arg_types
[i
], args
[i
], 0);
1164 result
= scm_call_n (proc
, argv
, cif
->nargs
);
1166 unpack (cif
->rtype
, ret
, result
, 1);
1169 SCM_DEFINE (scm_procedure_to_pointer
, "procedure->pointer", 3, 0, 0,
1170 (SCM return_type
, SCM proc
, SCM arg_types
),
1171 "Return a pointer to a C function of type @var{return_type}\n"
1172 "taking arguments of types @var{arg_types} (a list) and\n"
1173 "behaving as a proxy to procedure @var{proc}. Thus\n"
1174 "@var{proc}'s arity, supported argument types, and return\n"
1175 "type should match @var{return_type} and @var{arg_types}.\n")
1176 #define FUNC_NAME s_scm_procedure_to_pointer
1178 SCM cif_pointer
, pointer
;
1181 void *closure
, *executable
;
1183 cif
= make_cif (return_type
, arg_types
, FUNC_NAME
);
1185 closure
= ffi_closure_alloc (sizeof (ffi_closure
), &executable
);
1186 err
= ffi_prep_closure_loc ((ffi_closure
*) closure
, cif
,
1187 invoke_closure
, SCM_UNPACK_POINTER (proc
),
1191 ffi_closure_free (closure
);
1192 SCM_MISC_ERROR ("`ffi_prep_closure_loc' failed", SCM_EOL
);
1195 /* CIF points to GC-managed memory and it should remain as long as
1196 POINTER (see below) is live. Wrap it in a Scheme pointer to then
1197 hold a weak reference on it. */
1198 cif_pointer
= scm_from_pointer (cif
, NULL
);
1200 if (closure
== executable
)
1202 pointer
= scm_from_pointer (executable
, ffi_closure_free
);
1203 register_weak_reference (pointer
,
1204 scm_list_2 (proc
, cif_pointer
));
1208 /* CLOSURE needs to be freed eventually. However, since
1209 `GC_all_interior_pointers' is disabled, we can't just register
1210 a finalizer for CLOSURE. Instead, we create a pointer object
1211 for CLOSURE, with a finalizer, and register it as a weak
1212 reference of POINTER. */
1215 pointer
= scm_from_pointer (executable
, NULL
);
1216 friend = scm_from_pointer (closure
, ffi_closure_free
);
1218 register_weak_reference (pointer
,
1219 scm_list_3 (proc
, cif_pointer
, friend));
1226 #endif /* FFI_CLOSURES */
1231 scm_init_foreign (void)
1233 #ifndef SCM_MAGIC_SNARFER
1234 #include "libguile/foreign.x"
1236 scm_define (sym_void
, scm_from_uint8 (SCM_FOREIGN_TYPE_VOID
));
1237 scm_define (sym_float
, scm_from_uint8 (SCM_FOREIGN_TYPE_FLOAT
));
1238 scm_define (sym_double
, scm_from_uint8 (SCM_FOREIGN_TYPE_DOUBLE
));
1239 scm_define (sym_uint8
, scm_from_uint8 (SCM_FOREIGN_TYPE_UINT8
));
1240 scm_define (sym_int8
, scm_from_uint8 (SCM_FOREIGN_TYPE_INT8
));
1241 scm_define (sym_uint16
, scm_from_uint8 (SCM_FOREIGN_TYPE_UINT16
));
1242 scm_define (sym_int16
, scm_from_uint8 (SCM_FOREIGN_TYPE_INT16
));
1243 scm_define (sym_uint32
, scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32
));
1244 scm_define (sym_int32
, scm_from_uint8 (SCM_FOREIGN_TYPE_INT32
));
1245 scm_define (sym_uint64
, scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64
));
1246 scm_define (sym_int64
, scm_from_uint8 (SCM_FOREIGN_TYPE_INT64
));
1248 scm_define (sym_short
,
1249 #if SIZEOF_SHORT == 8
1250 scm_from_uint8 (SCM_FOREIGN_TYPE_INT64
)
1251 #elif SIZEOF_SHORT == 4
1252 scm_from_uint8 (SCM_FOREIGN_TYPE_INT32
)
1253 #elif SIZEOF_SHORT == 2
1254 scm_from_uint8 (SCM_FOREIGN_TYPE_INT16
)
1256 # error unsupported sizeof (short)
1260 scm_define (sym_unsigned_short
,
1261 #if SIZEOF_SHORT == 8
1262 scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64
)
1263 #elif SIZEOF_SHORT == 4
1264 scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32
)
1265 #elif SIZEOF_SHORT == 2
1266 scm_from_uint8 (SCM_FOREIGN_TYPE_UINT16
)
1268 # error unsupported sizeof (short)
1272 scm_define (sym_int
,
1274 scm_from_uint8 (SCM_FOREIGN_TYPE_INT64
)
1275 #elif SIZEOF_INT == 4
1276 scm_from_uint8 (SCM_FOREIGN_TYPE_INT32
)
1278 # error unsupported sizeof (int)
1282 scm_define (sym_unsigned_int
,
1283 #if SIZEOF_UNSIGNED_INT == 8
1284 scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64
)
1285 #elif SIZEOF_UNSIGNED_INT == 4
1286 scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32
)
1288 # error unsupported sizeof (unsigned int)
1292 scm_define (sym_long
,
1293 #if SIZEOF_LONG == 8
1294 scm_from_uint8 (SCM_FOREIGN_TYPE_INT64
)
1295 #elif SIZEOF_LONG == 4
1296 scm_from_uint8 (SCM_FOREIGN_TYPE_INT32
)
1298 # error unsupported sizeof (long)
1302 scm_define (sym_unsigned_long
,
1303 #if SIZEOF_UNSIGNED_LONG == 8
1304 scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64
)
1305 #elif SIZEOF_UNSIGNED_LONG == 4
1306 scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32
)
1308 # error unsupported sizeof (unsigned long)
1312 scm_define (sym_size_t
,
1313 #if SIZEOF_SIZE_T == 8
1314 scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64
)
1315 #elif SIZEOF_SIZE_T == 4
1316 scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32
)
1318 # error unsupported sizeof (size_t)
1322 scm_define (sym_ssize_t
,
1323 #if SIZEOF_SIZE_T == 8
1324 scm_from_uint8 (SCM_FOREIGN_TYPE_INT64
)
1325 #elif SIZEOF_SIZE_T == 4
1326 scm_from_uint8 (SCM_FOREIGN_TYPE_INT32
)
1328 # error unsupported sizeof (ssize_t)
1332 scm_define (sym_ptrdiff_t
,
1333 #if SCM_SIZEOF_SCM_T_PTRDIFF == 8
1334 scm_from_uint8 (SCM_FOREIGN_TYPE_INT64
)
1335 #elif SCM_SIZEOF_SCM_T_PTRDIFF == 4
1336 scm_from_uint8 (SCM_FOREIGN_TYPE_INT32
)
1338 # error unsupported sizeof (scm_t_ptrdiff)
1342 null_pointer
= scm_cell (scm_tc7_pointer
, 0);
1343 scm_define (sym_null
, null_pointer
);
1347 scm_register_foreign (void)
1349 scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION
,
1351 (scm_t_extension_init_func
)scm_init_foreign
,
1353 pointer_weak_refs
= scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY
);