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156119b0 | 1 | /* Copyright (C) 2010-2014 Free Software Foundation, Inc. |
5b46a8c2 | 2 | * |
e2c2a699 AW |
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. | |
7 | * | |
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. | |
12 | * | |
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 | |
16 | * 02110-1301 USA | |
17 | */ | |
18 | ||
19 | #if HAVE_CONFIG_H | |
20 | # include <config.h> | |
21 | #endif | |
22 | ||
d8b04f04 AW |
23 | #include <ffi.h> |
24 | ||
cdd47ec7 | 25 | #include <alloca.h> |
d8b04f04 | 26 | #include <alignof.h> |
e2c2a699 | 27 | #include <string.h> |
86425e26 LC |
28 | #include <assert.h> |
29 | ||
ea7d717b | 30 | #include "libguile/_scm.h" |
20aafae2 | 31 | #include "libguile/bytevectors.h" |
d8b04f04 | 32 | #include "libguile/instructions.h" |
05e74813 | 33 | #include "libguile/threads.h" |
ea7d717b | 34 | #include "libguile/foreign.h" |
e2c2a699 AW |
35 | |
36 | \f | |
37 | ||
ab4779ff AW |
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"); | |
42f7c01e | 49 | SCM_SYMBOL (sym_short, "short"); |
dd1464bf LC |
50 | SCM_SYMBOL (sym_int, "int"); |
51 | SCM_SYMBOL (sym_long, "long"); | |
42f7c01e | 52 | SCM_SYMBOL (sym_unsigned_short, "unsigned-short"); |
dd1464bf LC |
53 | SCM_SYMBOL (sym_unsigned_int, "unsigned-int"); |
54 | SCM_SYMBOL (sym_unsigned_long, "unsigned-long"); | |
55 | SCM_SYMBOL (sym_size_t, "size_t"); | |
3a3bea72 MW |
56 | SCM_SYMBOL (sym_ssize_t, "ssize_t"); |
57 | SCM_SYMBOL (sym_ptrdiff_t, "ptrdiff_t"); | |
ab4779ff | 58 | |
3435f3c0 AW |
59 | /* that's for pointers, you know. */ |
60 | SCM_SYMBOL (sym_asterisk, "*"); | |
61 | ||
54eb59cf | 62 | SCM_SYMBOL (sym_null, "%null-pointer"); |
01ad5a7b | 63 | SCM_SYMBOL (sym_null_pointer_error, "null-pointer-error"); |
54eb59cf LC |
64 | |
65 | /* The cell representing the null pointer. */ | |
3e5ea35c | 66 | static SCM null_pointer; |
3435f3c0 | 67 | |
d4149a51 LC |
68 | #if SIZEOF_VOID_P == 4 |
69 | # define scm_to_uintptr scm_to_uint32 | |
70 | # define scm_from_uintptr scm_from_uint32 | |
71 | #elif SIZEOF_VOID_P == 8 | |
72 | # define scm_to_uintptr scm_to_uint64 | |
73 | # define scm_from_uintptr scm_from_uint64 | |
74 | #else | |
75 | # error unsupported pointer size | |
76 | #endif | |
77 | ||
78 | ||
01ad5a7b LC |
79 | /* Raise a null pointer dereference error. */ |
80 | static void | |
81 | null_pointer_error (const char *func_name) | |
82 | { | |
83 | scm_error (sym_null_pointer_error, func_name, | |
84 | "null pointer dereference", SCM_EOL, SCM_EOL); | |
85 | } | |
86 | ||
87 | \f | |
d8b04f04 AW |
88 | static SCM cif_to_procedure (SCM cif, SCM func_ptr); |
89 | ||
90 | ||
5b46a8c2 | 91 | static SCM pointer_weak_refs = SCM_BOOL_F; |
05e74813 AW |
92 | static scm_i_pthread_mutex_t weak_refs_lock = SCM_I_PTHREAD_MUTEX_INITIALIZER; |
93 | ||
20aafae2 AW |
94 | |
95 | static void | |
96 | register_weak_reference (SCM from, SCM to) | |
97 | { | |
05e74813 | 98 | scm_i_pthread_mutex_lock (&weak_refs_lock); |
5b46a8c2 | 99 | scm_hashq_set_x (pointer_weak_refs, from, to); |
05e74813 | 100 | scm_i_pthread_mutex_unlock (&weak_refs_lock); |
20aafae2 | 101 | } |
d4149a51 | 102 | |
e2c2a699 | 103 | static void |
6922d92f | 104 | pointer_finalizer_trampoline (void *ptr, void *data) |
e2c2a699 | 105 | { |
5b46a8c2 LC |
106 | scm_t_pointer_finalizer finalizer = data; |
107 | finalizer (SCM_POINTER_VALUE (PTR2SCM (ptr))); | |
e2c2a699 AW |
108 | } |
109 | ||
6e097560 LC |
110 | SCM_DEFINE (scm_pointer_p, "pointer?", 1, 0, 0, |
111 | (SCM obj), | |
112 | "Return @code{#t} if @var{obj} is a pointer object, " | |
113 | "@code{#f} otherwise.\n") | |
114 | #define FUNC_NAME s_scm_pointer_p | |
115 | { | |
116 | return scm_from_bool (SCM_POINTER_P (obj)); | |
117 | } | |
118 | #undef FUNC_NAME | |
119 | ||
d4149a51 LC |
120 | SCM_DEFINE (scm_make_pointer, "make-pointer", 1, 1, 0, |
121 | (SCM address, SCM finalizer), | |
122 | "Return a foreign pointer object pointing to @var{address}. " | |
123 | "If @var{finalizer} is passed, it should be a pointer to a " | |
124 | "one-argument C function that will be called when the pointer " | |
125 | "object becomes unreachable.") | |
126 | #define FUNC_NAME s_scm_make_pointer | |
127 | { | |
128 | void *c_finalizer; | |
129 | scm_t_uintptr c_address; | |
d4149a51 LC |
130 | |
131 | c_address = scm_to_uintptr (address); | |
132 | if (SCM_UNBNDP (finalizer)) | |
133 | c_finalizer = NULL; | |
134 | else | |
135 | { | |
5b46a8c2 LC |
136 | SCM_VALIDATE_POINTER (2, finalizer); |
137 | c_finalizer = SCM_POINTER_VALUE (finalizer); | |
d4149a51 LC |
138 | } |
139 | ||
854aa906 | 140 | return scm_from_pointer ((void *) c_address, c_finalizer); |
d4149a51 LC |
141 | } |
142 | #undef FUNC_NAME | |
143 | ||
1d00abb0 MW |
144 | void * |
145 | scm_to_pointer (SCM pointer) | |
146 | #define FUNC_NAME "scm_to_pointer" | |
147 | { | |
148 | SCM_VALIDATE_POINTER (1, pointer); | |
149 | return SCM_POINTER_VALUE (pointer); | |
150 | } | |
151 | #undef FUNC_NAME | |
152 | ||
e2c2a699 | 153 | SCM |
5b46a8c2 | 154 | scm_from_pointer (void *ptr, scm_t_pointer_finalizer finalizer) |
e2c2a699 | 155 | { |
9fdee5b4 | 156 | SCM ret; |
d4149a51 | 157 | |
854aa906 LC |
158 | if (ptr == NULL && finalizer == NULL) |
159 | ret = null_pointer; | |
160 | else | |
e2c2a699 | 161 | { |
690a0112 | 162 | ret = scm_cell (scm_tc7_pointer, (scm_t_bits) ptr); |
854aa906 LC |
163 | |
164 | if (finalizer) | |
75ba64d6 AW |
165 | scm_i_set_finalizer (SCM2PTR (ret), pointer_finalizer_trampoline, |
166 | finalizer); | |
e2c2a699 AW |
167 | } |
168 | ||
9fdee5b4 | 169 | return ret; |
e2c2a699 AW |
170 | } |
171 | ||
5b46a8c2 LC |
172 | SCM_DEFINE (scm_pointer_address, "pointer-address", 1, 0, 0, |
173 | (SCM pointer), | |
174 | "Return the numerical value of @var{pointer}.") | |
175 | #define FUNC_NAME s_scm_pointer_address | |
e2c2a699 | 176 | { |
5b46a8c2 | 177 | SCM_VALIDATE_POINTER (1, pointer); |
01ad5a7b | 178 | |
5b46a8c2 | 179 | return scm_from_uintptr ((scm_t_uintptr) SCM_POINTER_VALUE (pointer)); |
e2c2a699 AW |
180 | } |
181 | #undef FUNC_NAME | |
182 | ||
148c3317 AW |
183 | SCM_DEFINE (scm_pointer_to_scm, "pointer->scm", 1, 0, 0, |
184 | (SCM pointer), | |
185 | "Unsafely cast @var{pointer} to a Scheme object.\n" | |
186 | "Cross your fingers!") | |
187 | #define FUNC_NAME s_scm_pointer_to_scm | |
188 | { | |
189 | SCM_VALIDATE_POINTER (1, pointer); | |
190 | ||
191 | return SCM_PACK ((scm_t_bits) SCM_POINTER_VALUE (pointer)); | |
192 | } | |
193 | #undef FUNC_NAME | |
194 | ||
195 | SCM_DEFINE (scm_scm_to_pointer, "scm->pointer", 1, 0, 0, | |
196 | (SCM scm), | |
197 | "Return a foreign pointer object with the @code{object-address}\n" | |
198 | "of @var{scm}.") | |
199 | #define FUNC_NAME s_scm_scm_to_pointer | |
200 | { | |
201 | SCM ret; | |
202 | ||
203 | ret = scm_from_pointer ((void*) SCM_UNPACK (scm), NULL); | |
204 | if (SCM_NIMP (ret)) | |
205 | register_weak_reference (ret, scm); | |
206 | ||
207 | return ret; | |
208 | } | |
209 | #undef FUNC_NAME | |
210 | ||
5b46a8c2 LC |
211 | SCM_DEFINE (scm_pointer_to_bytevector, "pointer->bytevector", 2, 2, 0, |
212 | (SCM pointer, SCM len, SCM offset, SCM uvec_type), | |
183a2a22 LC |
213 | "Return a bytevector aliasing the @var{len} bytes pointed\n" |
214 | "to by @var{pointer}.\n\n" | |
20aafae2 AW |
215 | "The user may specify an alternate default interpretation for\n" |
216 | "the memory by passing the @var{uvec_type} argument, to indicate\n" | |
217 | "that the memory is an array of elements of that type.\n" | |
218 | "@var{uvec_type} should be something that\n" | |
219 | "@code{uniform-vector-element-type} would return, like @code{f32}\n" | |
220 | "or @code{s16}.\n\n" | |
183a2a22 LC |
221 | "When @var{offset} is passed, it specifies the offset in bytes\n" |
222 | "relative to @var{pointer} of the memory region aliased by the\n" | |
223 | "returned bytevector.") | |
5b46a8c2 | 224 | #define FUNC_NAME s_scm_pointer_to_bytevector |
20aafae2 AW |
225 | { |
226 | SCM ret; | |
227 | scm_t_int8 *ptr; | |
228 | size_t boffset, blen; | |
229 | scm_t_array_element_type btype; | |
230 | ||
5b46a8c2 LC |
231 | SCM_VALIDATE_POINTER (1, pointer); |
232 | ptr = SCM_POINTER_VALUE (pointer); | |
54eb59cf LC |
233 | |
234 | if (SCM_UNLIKELY (ptr == NULL)) | |
01ad5a7b | 235 | null_pointer_error (FUNC_NAME); |
54eb59cf | 236 | |
20aafae2 AW |
237 | if (SCM_UNBNDP (uvec_type)) |
238 | btype = SCM_ARRAY_ELEMENT_TYPE_VU8; | |
239 | else | |
240 | { | |
241 | int i; | |
242 | for (i = 0; i <= SCM_ARRAY_ELEMENT_TYPE_LAST; i++) | |
243 | if (scm_is_eq (uvec_type, scm_i_array_element_types[i])) | |
244 | break; | |
245 | switch (i) | |
246 | { | |
247 | case SCM_ARRAY_ELEMENT_TYPE_VU8: | |
248 | case SCM_ARRAY_ELEMENT_TYPE_U8: | |
249 | case SCM_ARRAY_ELEMENT_TYPE_S8: | |
250 | case SCM_ARRAY_ELEMENT_TYPE_U16: | |
251 | case SCM_ARRAY_ELEMENT_TYPE_S16: | |
252 | case SCM_ARRAY_ELEMENT_TYPE_U32: | |
253 | case SCM_ARRAY_ELEMENT_TYPE_S32: | |
254 | case SCM_ARRAY_ELEMENT_TYPE_U64: | |
255 | case SCM_ARRAY_ELEMENT_TYPE_S64: | |
256 | case SCM_ARRAY_ELEMENT_TYPE_F32: | |
257 | case SCM_ARRAY_ELEMENT_TYPE_F64: | |
258 | case SCM_ARRAY_ELEMENT_TYPE_C32: | |
259 | case SCM_ARRAY_ELEMENT_TYPE_C64: | |
260 | btype = i; | |
261 | break; | |
262 | default: | |
263 | scm_wrong_type_arg_msg (FUNC_NAME, SCM_ARG1, uvec_type, | |
264 | "uniform vector type"); | |
265 | } | |
266 | } | |
d4149a51 | 267 | |
20aafae2 AW |
268 | if (SCM_UNBNDP (offset)) |
269 | boffset = 0; | |
20aafae2 AW |
270 | else |
271 | boffset = scm_to_size_t (offset); | |
272 | ||
d4149a51 | 273 | blen = scm_to_size_t (len); |
20aafae2 | 274 | |
1acb290f LC |
275 | ret = scm_c_take_typed_bytevector ((signed char *) ptr + boffset, |
276 | blen, btype); | |
5b46a8c2 | 277 | register_weak_reference (ret, pointer); |
20aafae2 AW |
278 | return ret; |
279 | } | |
280 | #undef FUNC_NAME | |
281 | ||
22697acb LC |
282 | SCM_DEFINE (scm_bytevector_to_pointer, "bytevector->pointer", 1, 1, 0, |
283 | (SCM bv, SCM offset), | |
5b46a8c2 | 284 | "Return a pointer pointer aliasing the memory pointed to by\n" |
22697acb LC |
285 | "@var{bv} or @var{offset} bytes after @var{bv} when @var{offset}\n" |
286 | "is passed.") | |
5b46a8c2 | 287 | #define FUNC_NAME s_scm_bytevector_to_pointer |
20aafae2 AW |
288 | { |
289 | SCM ret; | |
1acb290f | 290 | signed char *ptr; |
22697acb | 291 | size_t boffset; |
20aafae2 AW |
292 | |
293 | SCM_VALIDATE_BYTEVECTOR (1, bv); | |
294 | ptr = SCM_BYTEVECTOR_CONTENTS (bv); | |
22697acb | 295 | |
20aafae2 AW |
296 | if (SCM_UNBNDP (offset)) |
297 | boffset = 0; | |
298 | else | |
299 | boffset = scm_to_unsigned_integer (offset, 0, | |
300 | SCM_BYTEVECTOR_LENGTH (bv) - 1); | |
301 | ||
5b46a8c2 | 302 | ret = scm_from_pointer (ptr + boffset, NULL); |
20aafae2 AW |
303 | register_weak_reference (ret, bv); |
304 | return ret; | |
305 | } | |
306 | #undef FUNC_NAME | |
307 | ||
5b46a8c2 LC |
308 | SCM_DEFINE (scm_set_pointer_finalizer_x, "set-pointer-finalizer!", 2, 0, 0, |
309 | (SCM pointer, SCM finalizer), | |
3435f3c0 | 310 | "Arrange for the C procedure wrapped by @var{finalizer} to be\n" |
5b46a8c2 | 311 | "called on the pointer wrapped by @var{pointer} when @var{pointer}\n" |
3435f3c0 AW |
312 | "becomes unreachable. Note: the C procedure should not call into\n" |
313 | "Scheme. If you need a Scheme finalizer, use guardians.") | |
5b46a8c2 | 314 | #define FUNC_NAME s_scm_set_pointer_finalizer_x |
3435f3c0 | 315 | { |
5b46a8c2 LC |
316 | SCM_VALIDATE_POINTER (1, pointer); |
317 | SCM_VALIDATE_POINTER (2, finalizer); | |
d4149a51 | 318 | |
75ba64d6 AW |
319 | scm_i_add_finalizer (SCM2PTR (pointer), pointer_finalizer_trampoline, |
320 | SCM_POINTER_VALUE (finalizer)); | |
3435f3c0 AW |
321 | |
322 | return SCM_UNSPECIFIED; | |
323 | } | |
324 | #undef FUNC_NAME | |
325 | ||
e2c2a699 | 326 | void |
5b46a8c2 | 327 | scm_i_pointer_print (SCM pointer, SCM port, scm_print_state *pstate) |
e2c2a699 | 328 | { |
e5f7f675 AW |
329 | scm_puts ("#<pointer 0x", port); |
330 | scm_uintprint (scm_to_uintptr (scm_pointer_address (pointer)), 16, port); | |
e2c2a699 AW |
331 | scm_putc ('>', port); |
332 | } | |
333 | ||
334 | \f | |
fa2a89a6 LC |
335 | /* Non-primitive helpers functions. These procedures could be |
336 | implemented in terms of the primitives above but would be inefficient | |
337 | (heap allocation overhead, Scheme/C round trips, etc.) */ | |
338 | ||
339 | SCM_DEFINE (scm_dereference_pointer, "dereference-pointer", 1, 0, 0, | |
340 | (SCM pointer), | |
341 | "Assuming @var{pointer} points to a memory region that\n" | |
342 | "holds a pointer, return this pointer.") | |
343 | #define FUNC_NAME s_scm_dereference_pointer | |
344 | { | |
b7c1b60c MW |
345 | void **ptr; |
346 | ||
fa2a89a6 LC |
347 | SCM_VALIDATE_POINTER (1, pointer); |
348 | ||
b7c1b60c MW |
349 | ptr = SCM_POINTER_VALUE (pointer); |
350 | if (SCM_UNLIKELY (ptr == NULL)) | |
351 | null_pointer_error (FUNC_NAME); | |
352 | ||
353 | return scm_from_pointer (*ptr, NULL); | |
fa2a89a6 LC |
354 | } |
355 | #undef FUNC_NAME | |
356 | ||
c6b08d21 AW |
357 | SCM_DEFINE (scm_string_to_pointer, "string->pointer", 1, 1, 0, |
358 | (SCM string, SCM encoding), | |
fa2a89a6 | 359 | "Return a foreign pointer to a nul-terminated copy of\n" |
c6b08d21 AW |
360 | "@var{string} in the given @var{encoding}, defaulting to\n" |
361 | "the current locale encoding. The C string is freed when\n" | |
362 | "the returned foreign pointer becomes unreachable.\n\n" | |
363 | "This is the Scheme equivalent of @code{scm_to_stringn}.") | |
fa2a89a6 LC |
364 | #define FUNC_NAME s_scm_string_to_pointer |
365 | { | |
366 | SCM_VALIDATE_STRING (1, string); | |
367 | ||
368 | /* XXX: Finalizers slow down libgc; they could be avoided if | |
369 | `scm_to_string' & co. were able to use libgc-allocated memory. */ | |
370 | ||
c6b08d21 AW |
371 | if (SCM_UNBNDP (encoding)) |
372 | return scm_from_pointer (scm_to_locale_string (string), free); | |
373 | else | |
374 | { | |
375 | char *enc; | |
376 | SCM ret; | |
377 | ||
378 | SCM_VALIDATE_STRING (2, encoding); | |
379 | ||
380 | enc = scm_to_locale_string (encoding); | |
381 | scm_dynwind_begin (0); | |
382 | scm_dynwind_free (enc); | |
383 | ||
384 | ret = scm_from_pointer | |
385 | (scm_to_stringn (string, NULL, enc, | |
b22e94db | 386 | scm_i_default_port_conversion_handler ()), |
c6b08d21 AW |
387 | free); |
388 | ||
389 | scm_dynwind_end (); | |
390 | ||
391 | return ret; | |
392 | } | |
fa2a89a6 LC |
393 | } |
394 | #undef FUNC_NAME | |
395 | ||
c6b08d21 AW |
396 | SCM_DEFINE (scm_pointer_to_string, "pointer->string", 1, 2, 0, |
397 | (SCM pointer, SCM length, SCM encoding), | |
398 | "Return the string representing the C string pointed to by\n" | |
399 | "@var{pointer}. If @var{length} is omitted or @code{-1}, the\n" | |
400 | "string is assumed to be nul-terminated. Otherwise\n" | |
401 | "@var{length} is the number of bytes in memory pointed to by\n" | |
402 | "@var{pointer}. The C string is assumed to be in the given\n" | |
403 | "@var{encoding}, defaulting to the current locale encoding.\n\n" | |
404 | "This is the Scheme equivalent of @code{scm_from_stringn}.") | |
fa2a89a6 LC |
405 | #define FUNC_NAME s_scm_pointer_to_string |
406 | { | |
c6b08d21 AW |
407 | size_t len; |
408 | ||
fa2a89a6 LC |
409 | SCM_VALIDATE_POINTER (1, pointer); |
410 | ||
c6b08d21 AW |
411 | if (SCM_UNBNDP (length) |
412 | || scm_is_true (scm_eqv_p (length, scm_from_int (-1)))) | |
413 | len = (size_t)-1; | |
414 | else | |
415 | len = scm_to_size_t (length); | |
416 | ||
417 | if (SCM_UNBNDP (encoding)) | |
418 | return scm_from_locale_stringn (SCM_POINTER_VALUE (pointer), len); | |
419 | else | |
420 | { | |
421 | char *enc; | |
422 | SCM ret; | |
423 | ||
424 | SCM_VALIDATE_STRING (3, encoding); | |
425 | ||
426 | enc = scm_to_locale_string (encoding); | |
427 | scm_dynwind_begin (0); | |
428 | scm_dynwind_free (enc); | |
429 | ||
430 | ret = scm_from_stringn (SCM_POINTER_VALUE (pointer), len, enc, | |
b22e94db | 431 | scm_i_default_port_conversion_handler ()); |
c6b08d21 AW |
432 | |
433 | scm_dynwind_end (); | |
434 | ||
435 | return ret; | |
436 | } | |
fa2a89a6 LC |
437 | } |
438 | #undef FUNC_NAME | |
439 | ||
440 | \f | |
e2c2a699 | 441 | |
b9264dc5 AW |
442 | SCM_DEFINE (scm_alignof, "alignof", 1, 0, 0, (SCM type), |
443 | "Return the alignment of @var{type}, in bytes.\n\n" | |
444 | "@var{type} should be a valid C type, like @code{int}.\n" | |
445 | "Alternately @var{type} may be the symbol @code{*}, in which\n" | |
446 | "case the alignment of a pointer is returned. @var{type} may\n" | |
447 | "also be a list of types, in which case the alignment of a\n" | |
448 | "@code{struct} with ABI-conventional packing is returned.") | |
9a396cbd AW |
449 | #define FUNC_NAME s_scm_alignof |
450 | { | |
451 | if (SCM_I_INUMP (type)) | |
452 | { | |
453 | switch (SCM_I_INUM (type)) | |
454 | { | |
455 | case SCM_FOREIGN_TYPE_FLOAT: | |
1002c774 | 456 | return scm_from_size_t (alignof_type (float)); |
9a396cbd | 457 | case SCM_FOREIGN_TYPE_DOUBLE: |
1002c774 | 458 | return scm_from_size_t (alignof_type (double)); |
9a396cbd | 459 | case SCM_FOREIGN_TYPE_UINT8: |
1002c774 | 460 | return scm_from_size_t (alignof_type (scm_t_uint8)); |
9a396cbd | 461 | case SCM_FOREIGN_TYPE_INT8: |
1002c774 | 462 | return scm_from_size_t (alignof_type (scm_t_int8)); |
9a396cbd | 463 | case SCM_FOREIGN_TYPE_UINT16: |
1002c774 | 464 | return scm_from_size_t (alignof_type (scm_t_uint16)); |
9a396cbd | 465 | case SCM_FOREIGN_TYPE_INT16: |
1002c774 | 466 | return scm_from_size_t (alignof_type (scm_t_int16)); |
9a396cbd | 467 | case SCM_FOREIGN_TYPE_UINT32: |
1002c774 | 468 | return scm_from_size_t (alignof_type (scm_t_uint32)); |
9a396cbd | 469 | case SCM_FOREIGN_TYPE_INT32: |
1002c774 | 470 | return scm_from_size_t (alignof_type (scm_t_int32)); |
9a396cbd | 471 | case SCM_FOREIGN_TYPE_UINT64: |
1002c774 | 472 | return scm_from_size_t (alignof_type (scm_t_uint64)); |
9a396cbd | 473 | case SCM_FOREIGN_TYPE_INT64: |
1002c774 | 474 | return scm_from_size_t (alignof_type (scm_t_int64)); |
9a396cbd AW |
475 | default: |
476 | scm_wrong_type_arg (FUNC_NAME, 1, type); | |
477 | } | |
478 | } | |
3435f3c0 AW |
479 | else if (scm_is_eq (type, sym_asterisk)) |
480 | /* a pointer */ | |
1002c774 | 481 | return scm_from_size_t (alignof_type (void*)); |
9a396cbd | 482 | else if (scm_is_pair (type)) |
d82f8518 LC |
483 | { |
484 | /* TYPE is a structure. Section 3-3 of the i386, x86_64, PowerPC, | |
485 | and SPARC P.S. of the System V ABI all say: "Aggregates | |
486 | (structures and arrays) and unions assume the alignment of | |
487 | their most strictly aligned component." */ | |
488 | size_t max; | |
489 | ||
490 | for (max = 0; scm_is_pair (type); type = SCM_CDR (type)) | |
491 | { | |
492 | size_t align; | |
493 | ||
494 | align = scm_to_size_t (scm_alignof (SCM_CAR (type))); | |
495 | if (align > max) | |
496 | max = align; | |
497 | } | |
498 | ||
499 | return scm_from_size_t (max); | |
500 | } | |
9a396cbd AW |
501 | else |
502 | scm_wrong_type_arg (FUNC_NAME, 1, type); | |
503 | } | |
504 | #undef FUNC_NAME | |
505 | ||
b9264dc5 AW |
506 | SCM_DEFINE (scm_sizeof, "sizeof", 1, 0, 0, (SCM type), |
507 | "Return the size of @var{type}, in bytes.\n\n" | |
508 | "@var{type} should be a valid C type, like @code{int}.\n" | |
509 | "Alternately @var{type} may be the symbol @code{*}, in which\n" | |
510 | "case the size of a pointer is returned. @var{type} may also\n" | |
511 | "be a list of types, in which case the size of a @code{struct}\n" | |
512 | "with ABI-conventional packing is returned.") | |
9a396cbd AW |
513 | #define FUNC_NAME s_scm_sizeof |
514 | { | |
515 | if (SCM_I_INUMP (type)) | |
516 | { | |
517 | switch (SCM_I_INUM (type)) | |
518 | { | |
519 | case SCM_FOREIGN_TYPE_FLOAT: | |
520 | return scm_from_size_t (sizeof (float)); | |
521 | case SCM_FOREIGN_TYPE_DOUBLE: | |
522 | return scm_from_size_t (sizeof (double)); | |
523 | case SCM_FOREIGN_TYPE_UINT8: | |
524 | return scm_from_size_t (sizeof (scm_t_uint8)); | |
525 | case SCM_FOREIGN_TYPE_INT8: | |
526 | return scm_from_size_t (sizeof (scm_t_int8)); | |
527 | case SCM_FOREIGN_TYPE_UINT16: | |
528 | return scm_from_size_t (sizeof (scm_t_uint16)); | |
529 | case SCM_FOREIGN_TYPE_INT16: | |
530 | return scm_from_size_t (sizeof (scm_t_int16)); | |
531 | case SCM_FOREIGN_TYPE_UINT32: | |
532 | return scm_from_size_t (sizeof (scm_t_uint32)); | |
533 | case SCM_FOREIGN_TYPE_INT32: | |
534 | return scm_from_size_t (sizeof (scm_t_int32)); | |
535 | case SCM_FOREIGN_TYPE_UINT64: | |
536 | return scm_from_size_t (sizeof (scm_t_uint64)); | |
537 | case SCM_FOREIGN_TYPE_INT64: | |
538 | return scm_from_size_t (sizeof (scm_t_int64)); | |
539 | default: | |
540 | scm_wrong_type_arg (FUNC_NAME, 1, type); | |
541 | } | |
542 | } | |
3435f3c0 AW |
543 | else if (scm_is_eq (type, sym_asterisk)) |
544 | /* a pointer */ | |
545 | return scm_from_size_t (sizeof (void*)); | |
9a396cbd AW |
546 | else if (scm_is_pair (type)) |
547 | { | |
548 | /* a struct */ | |
549 | size_t off = 0; | |
550 | while (scm_is_pair (type)) | |
551 | { | |
552 | off = ROUND_UP (off, scm_to_size_t (scm_alignof (scm_car (type)))); | |
553 | off += scm_to_size_t (scm_sizeof (scm_car (type))); | |
554 | type = scm_cdr (type); | |
555 | } | |
556 | return scm_from_size_t (off); | |
557 | } | |
558 | else | |
559 | scm_wrong_type_arg (FUNC_NAME, 1, type); | |
560 | } | |
561 | #undef FUNC_NAME | |
562 | ||
563 | ||
d8b04f04 AW |
564 | /* return 1 on success, 0 on failure */ |
565 | static int | |
566 | parse_ffi_type (SCM type, int return_p, long *n_structs, long *n_struct_elts) | |
567 | { | |
568 | if (SCM_I_INUMP (type)) | |
569 | { | |
570 | if ((SCM_I_INUM (type) < 0 ) | |
571 | || (SCM_I_INUM (type) > SCM_FOREIGN_TYPE_LAST)) | |
572 | return 0; | |
573 | else if (SCM_I_INUM (type) == SCM_FOREIGN_TYPE_VOID && !return_p) | |
574 | return 0; | |
575 | else | |
576 | return 1; | |
577 | } | |
3435f3c0 AW |
578 | else if (scm_is_eq (type, sym_asterisk)) |
579 | /* a pointer */ | |
580 | return 1; | |
d8b04f04 AW |
581 | else |
582 | { | |
583 | long len; | |
584 | ||
585 | len = scm_ilength (type); | |
586 | if (len < 1) | |
587 | return 0; | |
588 | while (len--) | |
589 | { | |
590 | if (!parse_ffi_type (scm_car (type), 0, n_structs, n_struct_elts)) | |
591 | return 0; | |
592 | (*n_struct_elts)++; | |
593 | type = scm_cdr (type); | |
594 | } | |
595 | (*n_structs)++; | |
596 | return 1; | |
597 | } | |
598 | } | |
599 | ||
600 | static void | |
601 | fill_ffi_type (SCM type, ffi_type *ftype, ffi_type ***type_ptrs, | |
602 | ffi_type **types) | |
603 | { | |
604 | if (SCM_I_INUMP (type)) | |
605 | { | |
606 | switch (SCM_I_INUM (type)) | |
607 | { | |
608 | case SCM_FOREIGN_TYPE_FLOAT: | |
609 | *ftype = ffi_type_float; | |
610 | return; | |
611 | case SCM_FOREIGN_TYPE_DOUBLE: | |
612 | *ftype = ffi_type_double; | |
613 | return; | |
614 | case SCM_FOREIGN_TYPE_UINT8: | |
615 | *ftype = ffi_type_uint8; | |
616 | return; | |
617 | case SCM_FOREIGN_TYPE_INT8: | |
618 | *ftype = ffi_type_sint8; | |
619 | return; | |
620 | case SCM_FOREIGN_TYPE_UINT16: | |
621 | *ftype = ffi_type_uint16; | |
622 | return; | |
623 | case SCM_FOREIGN_TYPE_INT16: | |
624 | *ftype = ffi_type_sint16; | |
625 | return; | |
626 | case SCM_FOREIGN_TYPE_UINT32: | |
627 | *ftype = ffi_type_uint32; | |
628 | return; | |
629 | case SCM_FOREIGN_TYPE_INT32: | |
630 | *ftype = ffi_type_sint32; | |
631 | return; | |
632 | case SCM_FOREIGN_TYPE_UINT64: | |
633 | *ftype = ffi_type_uint64; | |
634 | return; | |
635 | case SCM_FOREIGN_TYPE_INT64: | |
636 | *ftype = ffi_type_sint64; | |
637 | return; | |
638 | case SCM_FOREIGN_TYPE_VOID: | |
639 | *ftype = ffi_type_void; | |
640 | return; | |
641 | default: | |
2ee07358 | 642 | scm_wrong_type_arg_msg ("pointer->procedure", 0, type, |
75383ddb | 643 | "foreign type"); |
d8b04f04 AW |
644 | } |
645 | } | |
3435f3c0 AW |
646 | else if (scm_is_eq (type, sym_asterisk)) |
647 | /* a pointer */ | |
648 | { | |
649 | *ftype = ffi_type_pointer; | |
650 | return; | |
651 | } | |
d8b04f04 AW |
652 | else |
653 | { | |
654 | long i, len; | |
655 | ||
656 | len = scm_ilength (type); | |
657 | ||
658 | ftype->size = 0; | |
659 | ftype->alignment = 0; | |
660 | ftype->type = FFI_TYPE_STRUCT; | |
661 | ftype->elements = *type_ptrs; | |
662 | *type_ptrs += len + 1; | |
663 | ||
664 | for (i = 0; i < len; i++) | |
665 | { | |
9a396cbd AW |
666 | ftype->elements[i] = *types; |
667 | *types += 1; | |
d8b04f04 AW |
668 | fill_ffi_type (scm_car (type), ftype->elements[i], |
669 | type_ptrs, types); | |
670 | type = scm_cdr (type); | |
671 | } | |
672 | ftype->elements[i] = NULL; | |
673 | } | |
674 | } | |
33186356 LC |
675 | |
676 | /* Return a "cif" (call interface) for the given RETURN_TYPE and | |
677 | ARG_TYPES. */ | |
678 | static ffi_cif * | |
679 | make_cif (SCM return_type, SCM arg_types, const char *caller) | |
680 | #define FUNC_NAME caller | |
d8b04f04 | 681 | { |
33186356 | 682 | SCM walk; |
d8b04f04 AW |
683 | long i, nargs, n_structs, n_struct_elts; |
684 | size_t cif_len; | |
685 | char *mem; | |
686 | ffi_cif *cif; | |
687 | ffi_type **type_ptrs; | |
688 | ffi_type *types; | |
5b46a8c2 | 689 | |
d8b04f04 AW |
690 | nargs = scm_ilength (arg_types); |
691 | SCM_ASSERT (nargs >= 0, arg_types, 3, FUNC_NAME); | |
692 | /* fixme: assert nargs < 1<<32 */ | |
693 | n_structs = n_struct_elts = 0; | |
694 | ||
695 | /* For want of talloc, we're going to have to do this in two passes: first we | |
696 | figure out how much memory is needed for all types, then we allocate the | |
697 | cif and the types all in one block. */ | |
698 | if (!parse_ffi_type (return_type, 1, &n_structs, &n_struct_elts)) | |
699 | scm_wrong_type_arg (FUNC_NAME, 1, return_type); | |
700 | for (walk = arg_types; scm_is_pair (walk); walk = scm_cdr (walk)) | |
701 | if (!parse_ffi_type (scm_car (walk), 0, &n_structs, &n_struct_elts)) | |
702 | scm_wrong_type_arg (FUNC_NAME, 3, scm_car (walk)); | |
33186356 | 703 | |
d8b04f04 AW |
704 | /* the memory: with space for the cif itself */ |
705 | cif_len = sizeof (ffi_cif); | |
706 | ||
707 | /* then ffi_type pointers: one for each arg, one for each struct | |
708 | element, and one for each struct (for null-termination) */ | |
1002c774 | 709 | cif_len = (ROUND_UP (cif_len, alignof_type (void *)) |
33186356 LC |
710 | + (nargs + n_structs + n_struct_elts)*sizeof(void*)); |
711 | ||
d8b04f04 AW |
712 | /* then the ffi_type structs themselves, one per arg and struct element, and |
713 | one for the return val */ | |
1002c774 | 714 | cif_len = (ROUND_UP (cif_len, alignof_type (ffi_type)) |
33186356 | 715 | + (nargs + n_struct_elts + 1)*sizeof(ffi_type)); |
087aa6aa LC |
716 | |
717 | mem = scm_gc_malloc_pointerless (cif_len, "foreign"); | |
3ef6650d AW |
718 | /* ensure all the memory is initialized, even the holes */ |
719 | memset (mem, 0, cif_len); | |
087aa6aa LC |
720 | cif = (ffi_cif *) mem; |
721 | ||
d8b04f04 | 722 | /* reuse cif_len to walk through the mem */ |
1002c774 | 723 | cif_len = ROUND_UP (sizeof (ffi_cif), alignof_type (void *)); |
d8b04f04 AW |
724 | type_ptrs = (ffi_type**)(mem + cif_len); |
725 | cif_len = ROUND_UP (cif_len | |
33186356 | 726 | + (nargs + n_structs + n_struct_elts)*sizeof(void*), |
1002c774 | 727 | alignof_type (ffi_type)); |
d8b04f04 | 728 | types = (ffi_type*)(mem + cif_len); |
33186356 | 729 | |
d8b04f04 AW |
730 | /* whew. now knit the pointers together. */ |
731 | cif->rtype = types++; | |
732 | fill_ffi_type (return_type, cif->rtype, &type_ptrs, &types); | |
733 | cif->arg_types = type_ptrs; | |
734 | type_ptrs += nargs; | |
735 | for (walk = arg_types, i = 0; scm_is_pair (walk); walk = scm_cdr (walk), i++) | |
736 | { | |
737 | cif->arg_types[i] = types++; | |
738 | fill_ffi_type (scm_car (walk), cif->arg_types[i], &type_ptrs, &types); | |
739 | } | |
740 | ||
741 | /* round out the cif, and we're done. */ | |
742 | cif->abi = FFI_DEFAULT_ABI; | |
743 | cif->nargs = nargs; | |
744 | cif->bytes = 0; | |
745 | cif->flags = 0; | |
33186356 | 746 | |
d8b04f04 | 747 | if (FFI_OK != ffi_prep_cif (cif, FFI_DEFAULT_ABI, cif->nargs, cif->rtype, |
33186356 LC |
748 | cif->arg_types)) |
749 | SCM_MISC_ERROR ("ffi_prep_cif failed", SCM_EOL); | |
750 | ||
751 | return cif; | |
752 | } | |
753 | #undef FUNC_NAME | |
754 | ||
2ee07358 | 755 | SCM_DEFINE (scm_pointer_to_procedure, "pointer->procedure", 3, 0, 0, |
33186356 LC |
756 | (SCM return_type, SCM func_ptr, SCM arg_types), |
757 | "Make a foreign function.\n\n" | |
758 | "Given the foreign void pointer @var{func_ptr}, its argument and\n" | |
759 | "return types @var{arg_types} and @var{return_type}, return a\n" | |
760 | "procedure that will pass arguments to the foreign function\n" | |
761 | "and return appropriate values.\n\n" | |
762 | "@var{arg_types} should be a list of foreign types.\n" | |
763 | "@code{return_type} should be a foreign type.") | |
2ee07358 | 764 | #define FUNC_NAME s_scm_pointer_to_procedure |
33186356 LC |
765 | { |
766 | ffi_cif *cif; | |
767 | ||
768 | SCM_VALIDATE_POINTER (2, func_ptr); | |
d8b04f04 | 769 | |
33186356 LC |
770 | cif = make_cif (return_type, arg_types, FUNC_NAME); |
771 | ||
772 | return cif_to_procedure (scm_from_pointer (cif, NULL), func_ptr); | |
d8b04f04 AW |
773 | } |
774 | #undef FUNC_NAME | |
775 | ||
776 | \f | |
777 | ||
778 | /* Pre-generate trampolines for less than 10 arguments. */ | |
779 | ||
780 | #ifdef WORDS_BIGENDIAN | |
5ccc3764 MW |
781 | #define OBJCODE_HEADER(M) M (0), M (0), M (0), M (8), M (0), M (0), M (0), M (40) |
782 | #define META_HEADER(M) M (0), M (0), M (0), M (32), M (0), M (0), M (0), M (0) | |
d8b04f04 | 783 | #else |
5ccc3764 MW |
784 | #define OBJCODE_HEADER(M) M (8), M (0), M (0), M (0), M (40), M (0), M (0), M (0) |
785 | #define META_HEADER(M) M (32), M (0), M (0), M (0), M (0), M (0), M (0), M (0) | |
d8b04f04 AW |
786 | #endif |
787 | ||
5ccc3764 MW |
788 | #define GEN_CODE(M, nreq) \ |
789 | OBJCODE_HEADER (M), \ | |
790 | /* 0 */ M (scm_op_assert_nargs_ee), M (0), M (nreq), /* assert number of args */ \ | |
791 | /* 3 */ M (scm_op_object_ref), M (0), /* push the pair with the cif and the function pointer */ \ | |
792 | /* 5 */ M (scm_op_foreign_call), M (nreq), /* and call (will return value as well) */ \ | |
793 | /* 7 */ M (scm_op_nop), \ | |
794 | /* 8 */ META (M, 3, 7, nreq) | |
795 | ||
796 | #define META(M, start, end, nreq) \ | |
797 | META_HEADER (M), \ | |
798 | /* 0 */ M (scm_op_make_eol), /* bindings */ \ | |
799 | /* 1 */ M (scm_op_make_eol), /* sources */ \ | |
800 | /* 2 */ M (scm_op_make_int8), M (start), M (scm_op_make_int8), M (end), /* arity: from ip N to ip N */ \ | |
801 | /* 6 */ M (scm_op_make_int8), M (nreq), /* the arity is N required args */ \ | |
802 | /* 8 */ M (scm_op_list), M (0), M (3), /* make a list of those 3 vals */ \ | |
803 | /* 11 */ M (scm_op_list), M (0), M (1), /* and the arities will be a list of that one list */ \ | |
804 | /* 14 */ M (scm_op_load_symbol), M (0), M (0), M (4), M ('n'), M ('a'), M ('M'), M ('e'), /* `name' */ \ | |
805 | /* 22 */ M (scm_op_object_ref), M (1), /* the name from the object table */ \ | |
806 | /* 24 */ M (scm_op_cons), /* make a pair for the properties */ \ | |
807 | /* 25 */ M (scm_op_list), M (0), M (4), /* pack bindings, sources, and arities into list */ \ | |
808 | /* 28 */ M (scm_op_return), /* and return */ \ | |
809 | /* 29 */ M (scm_op_nop), M (scm_op_nop), M (scm_op_nop) \ | |
d8b04f04 AW |
810 | /* 32 */ |
811 | ||
5ccc3764 MW |
812 | #define M_STATIC(x) (x) |
813 | #define CODE(nreq) GEN_CODE (M_STATIC, nreq) | |
814 | ||
d8b04f04 AW |
815 | static const struct |
816 | { | |
156119b0 | 817 | SCM_ALIGNED (8) scm_t_uint64 dummy; /* alignment */ |
d8b04f04 AW |
818 | const scm_t_uint8 bytes[10 * (sizeof (struct scm_objcode) + 8 |
819 | + sizeof (struct scm_objcode) + 32)]; | |
820 | } raw_bytecode = { | |
821 | 0, | |
822 | { | |
823 | CODE (0), CODE (1), CODE (2), CODE (3), CODE (4), | |
824 | CODE (5), CODE (6), CODE (7), CODE (8), CODE (9) | |
825 | } | |
826 | }; | |
827 | ||
5ccc3764 MW |
828 | static SCM |
829 | make_objcode_trampoline (unsigned int nargs) | |
830 | { | |
831 | const int size = sizeof (struct scm_objcode) + 8 | |
832 | + sizeof (struct scm_objcode) + 32; | |
833 | SCM bytecode = scm_c_make_bytevector (size); | |
834 | scm_t_uint8 *bytes = (scm_t_uint8 *) SCM_BYTEVECTOR_CONTENTS (bytecode); | |
835 | int i = 0; | |
836 | ||
837 | #define M_DYNAMIC(x) (bytes[i++] = (x)) | |
838 | GEN_CODE (M_DYNAMIC, nargs); | |
839 | #undef M_DYNAMIC | |
840 | ||
841 | if (i != size) | |
842 | scm_syserror ("make_objcode_trampoline"); | |
843 | return scm_bytecode_to_native_objcode (bytecode); | |
844 | } | |
845 | ||
846 | #undef GEN_CODE | |
d8b04f04 | 847 | #undef META |
5ccc3764 MW |
848 | #undef M_STATIC |
849 | #undef CODE | |
d8b04f04 AW |
850 | #undef OBJCODE_HEADER |
851 | #undef META_HEADER | |
852 | ||
853 | /* | |
854 | (defun generate-objcode-cells (n) | |
855 | "Generate objcode cells for up to N arguments" | |
856 | (interactive "p") | |
857 | (let ((i 0)) | |
858 | (while (< i n) | |
859 | (insert | |
860 | (format " { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + %d) },\n" | |
861 | (* (+ 4 4 8 4 4 32) i))) | |
862 | (insert " { SCM_BOOL_F, SCM_PACK (0) },\n") | |
863 | (setq i (1+ i))))) | |
864 | */ | |
865 | #define STATIC_OBJCODE_TAG \ | |
f9654187 | 866 | SCM_PACK (SCM_MAKE_OBJCODE_TAG (SCM_OBJCODE_TYPE_STATIC, 0)) |
d8b04f04 AW |
867 | |
868 | static const struct | |
869 | { | |
156119b0 | 870 | SCM_ALIGNED (8) scm_t_uint64 dummy; /* alignment */ |
d8b04f04 AW |
871 | scm_t_cell cells[10 * 2]; /* 10 double cells */ |
872 | } objcode_cells = { | |
873 | 0, | |
874 | /* C-u 1 0 M-x generate-objcode-cells RET */ | |
875 | { | |
876 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 0) }, | |
877 | { SCM_BOOL_F, SCM_PACK (0) }, | |
878 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 56) }, | |
879 | { SCM_BOOL_F, SCM_PACK (0) }, | |
880 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 112) }, | |
881 | { SCM_BOOL_F, SCM_PACK (0) }, | |
882 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 168) }, | |
883 | { SCM_BOOL_F, SCM_PACK (0) }, | |
884 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 224) }, | |
885 | { SCM_BOOL_F, SCM_PACK (0) }, | |
886 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 280) }, | |
887 | { SCM_BOOL_F, SCM_PACK (0) }, | |
888 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 336) }, | |
889 | { SCM_BOOL_F, SCM_PACK (0) }, | |
890 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 392) }, | |
891 | { SCM_BOOL_F, SCM_PACK (0) }, | |
892 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 448) }, | |
893 | { SCM_BOOL_F, SCM_PACK (0) }, | |
894 | { STATIC_OBJCODE_TAG, SCM_PACK (raw_bytecode.bytes + 504) }, | |
895 | { SCM_BOOL_F, SCM_PACK (0) } | |
896 | } | |
897 | }; | |
898 | ||
899 | static const SCM objcode_trampolines[10] = { | |
900 | SCM_PACK (objcode_cells.cells+0), | |
901 | SCM_PACK (objcode_cells.cells+2), | |
902 | SCM_PACK (objcode_cells.cells+4), | |
903 | SCM_PACK (objcode_cells.cells+6), | |
904 | SCM_PACK (objcode_cells.cells+8), | |
905 | SCM_PACK (objcode_cells.cells+10), | |
906 | SCM_PACK (objcode_cells.cells+12), | |
907 | SCM_PACK (objcode_cells.cells+14), | |
908 | SCM_PACK (objcode_cells.cells+16), | |
909 | SCM_PACK (objcode_cells.cells+18), | |
910 | }; | |
911 | ||
5ccc3764 MW |
912 | static SCM large_objcode_trampolines = SCM_UNDEFINED; |
913 | static scm_i_pthread_mutex_t large_objcode_trampolines_mutex = | |
914 | SCM_I_PTHREAD_MUTEX_INITIALIZER; | |
915 | ||
d8b04f04 | 916 | static SCM |
5ccc3764 | 917 | get_objcode_trampoline (unsigned int nargs) |
d8b04f04 | 918 | { |
5ccc3764 | 919 | SCM objcode; |
d4149a51 | 920 | |
d8b04f04 AW |
921 | if (nargs < 10) |
922 | objcode = objcode_trampolines[nargs]; | |
5ccc3764 MW |
923 | else if (nargs < 128) |
924 | { | |
925 | scm_i_scm_pthread_mutex_lock (&large_objcode_trampolines_mutex); | |
926 | if (SCM_UNBNDP (large_objcode_trampolines)) | |
927 | large_objcode_trampolines = scm_c_make_vector (128, SCM_UNDEFINED); | |
928 | objcode = scm_c_vector_ref (large_objcode_trampolines, nargs); | |
929 | if (SCM_UNBNDP (objcode)) | |
930 | scm_c_vector_set_x (large_objcode_trampolines, nargs, | |
931 | objcode = make_objcode_trampoline (nargs)); | |
932 | scm_i_pthread_mutex_unlock (&large_objcode_trampolines_mutex); | |
933 | } | |
d8b04f04 | 934 | else |
5ccc3764 | 935 | scm_misc_error ("make-foreign-function", "args >= 128 currently unimplemented", |
75383ddb | 936 | SCM_EOL); |
5ccc3764 MW |
937 | |
938 | return objcode; | |
939 | } | |
940 | ||
941 | static SCM | |
942 | cif_to_procedure (SCM cif, SCM func_ptr) | |
943 | { | |
944 | ffi_cif *c_cif; | |
945 | SCM objcode, table, ret; | |
946 | ||
947 | c_cif = (ffi_cif *) SCM_POINTER_VALUE (cif); | |
948 | objcode = get_objcode_trampoline (c_cif->nargs); | |
d8b04f04 AW |
949 | |
950 | table = scm_c_make_vector (2, SCM_UNDEFINED); | |
951 | SCM_SIMPLE_VECTOR_SET (table, 0, scm_cons (cif, func_ptr)); | |
952 | SCM_SIMPLE_VECTOR_SET (table, 1, SCM_BOOL_F); /* name */ | |
953 | ret = scm_make_program (objcode, table, SCM_BOOL_F); | |
954 | ||
955 | return ret; | |
956 | } | |
957 | ||
165a8643 | 958 | /* Set *LOC to the foreign representation of X with TYPE. */ |
4d9130a5 | 959 | static void |
a6ea740b | 960 | unpack (const ffi_type *type, void *loc, SCM x, int return_value_p) |
9970cf67 | 961 | #define FUNC_NAME "scm_i_foreign_call" |
4d9130a5 AW |
962 | { |
963 | switch (type->type) | |
964 | { | |
965 | case FFI_TYPE_FLOAT: | |
165a8643 | 966 | *(float *) loc = scm_to_double (x); |
4d9130a5 AW |
967 | break; |
968 | case FFI_TYPE_DOUBLE: | |
165a8643 | 969 | *(double *) loc = scm_to_double (x); |
4d9130a5 | 970 | break; |
a6ea740b AS |
971 | |
972 | /* For integer return values smaller than `int', libffi expects the | |
973 | result in an `ffi_arg'-long buffer. */ | |
974 | ||
4d9130a5 | 975 | case FFI_TYPE_UINT8: |
a6ea740b AS |
976 | if (return_value_p) |
977 | *(ffi_arg *) loc = scm_to_uint8 (x); | |
978 | else | |
979 | *(scm_t_uint8 *) loc = scm_to_uint8 (x); | |
4d9130a5 AW |
980 | break; |
981 | case FFI_TYPE_SINT8: | |
a6ea740b AS |
982 | if (return_value_p) |
983 | *(ffi_arg *) loc = scm_to_int8 (x); | |
984 | else | |
985 | *(scm_t_int8 *) loc = scm_to_int8 (x); | |
4d9130a5 AW |
986 | break; |
987 | case FFI_TYPE_UINT16: | |
a6ea740b AS |
988 | if (return_value_p) |
989 | *(ffi_arg *) loc = scm_to_uint16 (x); | |
990 | else | |
991 | *(scm_t_uint16 *) loc = scm_to_uint16 (x); | |
4d9130a5 AW |
992 | break; |
993 | case FFI_TYPE_SINT16: | |
a6ea740b AS |
994 | if (return_value_p) |
995 | *(ffi_arg *) loc = scm_to_int16 (x); | |
996 | else | |
997 | *(scm_t_int16 *) loc = scm_to_int16 (x); | |
4d9130a5 AW |
998 | break; |
999 | case FFI_TYPE_UINT32: | |
a6ea740b AS |
1000 | if (return_value_p) |
1001 | *(ffi_arg *) loc = scm_to_uint32 (x); | |
1002 | else | |
1003 | *(scm_t_uint32 *) loc = scm_to_uint32 (x); | |
4d9130a5 AW |
1004 | break; |
1005 | case FFI_TYPE_SINT32: | |
a6ea740b AS |
1006 | if (return_value_p) |
1007 | *(ffi_arg *) loc = scm_to_int32 (x); | |
1008 | else | |
1009 | *(scm_t_int32 *) loc = scm_to_int32 (x); | |
4d9130a5 AW |
1010 | break; |
1011 | case FFI_TYPE_UINT64: | |
165a8643 | 1012 | *(scm_t_uint64 *) loc = scm_to_uint64 (x); |
4d9130a5 AW |
1013 | break; |
1014 | case FFI_TYPE_SINT64: | |
165a8643 | 1015 | *(scm_t_int64 *) loc = scm_to_int64 (x); |
4d9130a5 AW |
1016 | break; |
1017 | case FFI_TYPE_STRUCT: | |
9970cf67 | 1018 | SCM_VALIDATE_POINTER (1, x); |
5b46a8c2 | 1019 | memcpy (loc, SCM_POINTER_VALUE (x), type->size); |
4d9130a5 AW |
1020 | break; |
1021 | case FFI_TYPE_POINTER: | |
9970cf67 | 1022 | SCM_VALIDATE_POINTER (1, x); |
5b46a8c2 | 1023 | *(void **) loc = SCM_POINTER_VALUE (x); |
4d9130a5 | 1024 | break; |
443f25dc LC |
1025 | case FFI_TYPE_VOID: |
1026 | /* Do nothing. */ | |
1027 | break; | |
4d9130a5 AW |
1028 | default: |
1029 | abort (); | |
1030 | } | |
1031 | } | |
9970cf67 | 1032 | #undef FUNC_NAME |
4d9130a5 | 1033 | |
012062a0 LC |
1034 | /* Return a Scheme representation of the foreign value at LOC of type |
1035 | TYPE. When RETURN_VALUE_P is true, LOC is assumed to point to a | |
1036 | return value buffer; otherwise LOC is assumed to point to an | |
1037 | argument buffer. */ | |
4d9130a5 | 1038 | static SCM |
012062a0 | 1039 | pack (const ffi_type * type, const void *loc, int return_value_p) |
4d9130a5 AW |
1040 | { |
1041 | switch (type->type) | |
1042 | { | |
1043 | case FFI_TYPE_VOID: | |
1044 | return SCM_UNSPECIFIED; | |
1045 | case FFI_TYPE_FLOAT: | |
165a8643 | 1046 | return scm_from_double (*(float *) loc); |
4d9130a5 | 1047 | case FFI_TYPE_DOUBLE: |
165a8643 | 1048 | return scm_from_double (*(double *) loc); |
012062a0 LC |
1049 | |
1050 | /* For integer return values smaller than `int', libffi stores the | |
1051 | result in an `ffi_arg'-long buffer, of which only the | |
1052 | significant bits must be kept---hence the pair of casts below. | |
1053 | See <http://thread.gmane.org/gmane.comp.lib.ffi.general/406> | |
1054 | for details. */ | |
1055 | ||
4d9130a5 | 1056 | case FFI_TYPE_UINT8: |
012062a0 LC |
1057 | if (return_value_p) |
1058 | return scm_from_uint8 ((scm_t_uint8) *(ffi_arg *) loc); | |
1059 | else | |
1060 | return scm_from_uint8 (* (scm_t_uint8 *) loc); | |
4d9130a5 | 1061 | case FFI_TYPE_SINT8: |
012062a0 LC |
1062 | if (return_value_p) |
1063 | return scm_from_int8 ((scm_t_int8) *(ffi_arg *) loc); | |
1064 | else | |
1065 | return scm_from_int8 (* (scm_t_int8 *) loc); | |
4d9130a5 | 1066 | case FFI_TYPE_UINT16: |
012062a0 LC |
1067 | if (return_value_p) |
1068 | return scm_from_uint16 ((scm_t_uint16) *(ffi_arg *) loc); | |
1069 | else | |
1070 | return scm_from_uint16 (* (scm_t_uint16 *) loc); | |
4d9130a5 | 1071 | case FFI_TYPE_SINT16: |
012062a0 LC |
1072 | if (return_value_p) |
1073 | return scm_from_int16 ((scm_t_int16) *(ffi_arg *) loc); | |
1074 | else | |
1075 | return scm_from_int16 (* (scm_t_int16 *) loc); | |
4d9130a5 | 1076 | case FFI_TYPE_UINT32: |
012062a0 LC |
1077 | if (return_value_p) |
1078 | return scm_from_uint32 ((scm_t_uint32) *(ffi_arg *) loc); | |
1079 | else | |
1080 | return scm_from_uint32 (* (scm_t_uint32 *) loc); | |
4d9130a5 | 1081 | case FFI_TYPE_SINT32: |
012062a0 LC |
1082 | if (return_value_p) |
1083 | return scm_from_int32 ((scm_t_int32) *(ffi_arg *) loc); | |
1084 | else | |
1085 | return scm_from_int32 (* (scm_t_int32 *) loc); | |
4d9130a5 | 1086 | case FFI_TYPE_UINT64: |
165a8643 | 1087 | return scm_from_uint64 (*(scm_t_uint64 *) loc); |
4d9130a5 | 1088 | case FFI_TYPE_SINT64: |
165a8643 | 1089 | return scm_from_int64 (*(scm_t_int64 *) loc); |
012062a0 | 1090 | |
4d9130a5 AW |
1091 | case FFI_TYPE_STRUCT: |
1092 | { | |
165a8643 LC |
1093 | void *mem = scm_gc_malloc_pointerless (type->size, "foreign"); |
1094 | memcpy (mem, loc, type->size); | |
5b46a8c2 | 1095 | return scm_from_pointer (mem, NULL); |
4d9130a5 AW |
1096 | } |
1097 | case FFI_TYPE_POINTER: | |
5b46a8c2 | 1098 | return scm_from_pointer (*(void **) loc, NULL); |
4d9130a5 AW |
1099 | default: |
1100 | abort (); | |
1101 | } | |
1102 | } | |
1103 | ||
165a8643 | 1104 | |
4d9130a5 | 1105 | SCM |
165a8643 | 1106 | scm_i_foreign_call (SCM foreign, const SCM *argv) |
4d9130a5 AW |
1107 | { |
1108 | /* FOREIGN is the pair that cif_to_procedure set as the 0th element of the | |
1109 | objtable. */ | |
1110 | ffi_cif *cif; | |
b577bc90 | 1111 | void (*func) (void); |
4d9130a5 AW |
1112 | scm_t_uint8 *data; |
1113 | void *rvalue; | |
1114 | void **args; | |
1115 | unsigned i; | |
a2c69049 | 1116 | size_t arg_size; |
4d9130a5 AW |
1117 | scm_t_ptrdiff off; |
1118 | ||
5b46a8c2 LC |
1119 | cif = SCM_POINTER_VALUE (SCM_CAR (foreign)); |
1120 | func = SCM_POINTER_VALUE (SCM_CDR (foreign)); | |
a2c69049 LC |
1121 | |
1122 | /* Argument pointers. */ | |
b577bc90 | 1123 | args = alloca (sizeof (void *) * cif->nargs); |
a2c69049 | 1124 | |
86425e26 LC |
1125 | /* Compute the worst-case amount of memory needed to store all the argument |
1126 | values. Note: as of libffi 3.0.9 `cif->bytes' is undocumented and is zero, | |
1127 | so it can't be used for that purpose. */ | |
1128 | for (i = 0, arg_size = 0; i < cif->nargs; i++) | |
1129 | arg_size += cif->arg_types[i]->size + cif->arg_types[i]->alignment - 1; | |
a2c69049 LC |
1130 | |
1131 | /* Space for argument values, followed by return value. */ | |
86425e26 LC |
1132 | data = alloca (arg_size + cif->rtype->size |
1133 | + max (sizeof (void *), cif->rtype->alignment)); | |
a2c69049 | 1134 | |
165a8643 LC |
1135 | /* Unpack ARGV to native values, setting ARGV pointers. */ |
1136 | for (i = 0, off = 0; | |
1137 | i < cif->nargs; | |
86425e26 LC |
1138 | off = (scm_t_uint8 *) args[i] - data + cif->arg_types[i]->size, |
1139 | i++) | |
4d9130a5 | 1140 | { |
86425e26 LC |
1141 | /* Suitably align the storage area for argument I. */ |
1142 | args[i] = (void *) ROUND_UP ((scm_t_uintptr) data + off, | |
1143 | cif->arg_types[i]->alignment); | |
1144 | assert ((scm_t_uintptr) args[i] % cif->arg_types[i]->alignment == 0); | |
a6ea740b | 1145 | unpack (cif->arg_types[i], args[i], argv[i], 0); |
4d9130a5 | 1146 | } |
165a8643 | 1147 | |
86425e26 LC |
1148 | /* Prepare space for the return value. On some platforms, such as |
1149 | `armv5tel-*-linux-gnueabi', the return value has to be at least | |
1150 | word-aligned, even if its type doesn't have any alignment requirement as is | |
1151 | the case with `char'. */ | |
1152 | rvalue = (void *) ROUND_UP ((scm_t_uintptr) data + off, | |
1153 | max (sizeof (void *), cif->rtype->alignment)); | |
4d9130a5 AW |
1154 | |
1155 | /* off we go! */ | |
1156 | ffi_call (cif, func, rvalue, args); | |
1157 | ||
012062a0 | 1158 | return pack (cif->rtype, rvalue, 1); |
4d9130a5 AW |
1159 | } |
1160 | ||
d8b04f04 | 1161 | \f |
33186356 LC |
1162 | /* Function pointers aka. "callbacks" or "closures". */ |
1163 | ||
1164 | #ifdef FFI_CLOSURES | |
1165 | ||
1166 | /* Trampoline to invoke a libffi closure that wraps a Scheme | |
1167 | procedure. */ | |
1168 | static void | |
1169 | invoke_closure (ffi_cif *cif, void *ret, void **args, void *data) | |
1170 | { | |
1171 | size_t i; | |
1172 | SCM proc, *argv, result; | |
1173 | ||
1174 | proc = PTR2SCM (data); | |
1175 | ||
1176 | argv = alloca (cif->nargs * sizeof (*argv)); | |
1177 | ||
1178 | /* Pack ARGS to SCM values, setting ARGV pointers. */ | |
1179 | for (i = 0; i < cif->nargs; i++) | |
012062a0 | 1180 | argv[i] = pack (cif->arg_types[i], args[i], 0); |
33186356 LC |
1181 | |
1182 | result = scm_call_n (proc, argv, cif->nargs); | |
1183 | ||
a6ea740b | 1184 | unpack (cif->rtype, ret, result, 1); |
33186356 LC |
1185 | } |
1186 | ||
1187 | SCM_DEFINE (scm_procedure_to_pointer, "procedure->pointer", 3, 0, 0, | |
1188 | (SCM return_type, SCM proc, SCM arg_types), | |
b7e64f8b BT |
1189 | "Return a pointer to a C function of type @var{return_type}\n" |
1190 | "taking arguments of types @var{arg_types} (a list) and\n" | |
33186356 LC |
1191 | "behaving as a proxy to procedure @var{proc}. Thus\n" |
1192 | "@var{proc}'s arity, supported argument types, and return\n" | |
b7e64f8b | 1193 | "type should match @var{return_type} and @var{arg_types}.\n") |
33186356 LC |
1194 | #define FUNC_NAME s_scm_procedure_to_pointer |
1195 | { | |
46d80cae | 1196 | SCM cif_pointer, pointer; |
33186356 LC |
1197 | ffi_cif *cif; |
1198 | ffi_status err; | |
1199 | void *closure, *executable; | |
1200 | ||
1201 | cif = make_cif (return_type, arg_types, FUNC_NAME); | |
1202 | ||
1203 | closure = ffi_closure_alloc (sizeof (ffi_closure), &executable); | |
1204 | err = ffi_prep_closure_loc ((ffi_closure *) closure, cif, | |
1205 | invoke_closure, SCM2PTR (proc), | |
1206 | executable); | |
1207 | if (err != FFI_OK) | |
1208 | { | |
1209 | ffi_closure_free (closure); | |
1210 | SCM_MISC_ERROR ("`ffi_prep_closure_loc' failed", SCM_EOL); | |
1211 | } | |
1212 | ||
46d80cae LC |
1213 | /* CIF points to GC-managed memory and it should remain as long as |
1214 | POINTER (see below) is live. Wrap it in a Scheme pointer to then | |
1215 | hold a weak reference on it. */ | |
1216 | cif_pointer = scm_from_pointer (cif, NULL); | |
1217 | ||
33186356 | 1218 | if (closure == executable) |
46d80cae LC |
1219 | { |
1220 | pointer = scm_from_pointer (executable, ffi_closure_free); | |
59a02733 LC |
1221 | register_weak_reference (pointer, |
1222 | scm_list_2 (proc, cif_pointer)); | |
46d80cae | 1223 | } |
33186356 LC |
1224 | else |
1225 | { | |
1226 | /* CLOSURE needs to be freed eventually. However, since | |
1227 | `GC_all_interior_pointers' is disabled, we can't just register | |
1228 | a finalizer for CLOSURE. Instead, we create a pointer object | |
1229 | for CLOSURE, with a finalizer, and register it as a weak | |
1230 | reference of POINTER. */ | |
1231 | SCM friend; | |
1232 | ||
1233 | pointer = scm_from_pointer (executable, NULL); | |
1234 | friend = scm_from_pointer (closure, ffi_closure_free); | |
1235 | ||
59a02733 LC |
1236 | register_weak_reference (pointer, |
1237 | scm_list_3 (proc, cif_pointer, friend)); | |
33186356 LC |
1238 | } |
1239 | ||
1240 | return pointer; | |
1241 | } | |
1242 | #undef FUNC_NAME | |
1243 | ||
1244 | #endif /* FFI_CLOSURES */ | |
1245 | ||
1246 | \f | |
d8b04f04 | 1247 | |
ab4779ff | 1248 | static void |
e2c2a699 AW |
1249 | scm_init_foreign (void) |
1250 | { | |
1251 | #ifndef SCM_MAGIC_SNARFER | |
1252 | #include "libguile/foreign.x" | |
1253 | #endif | |
ab4779ff AW |
1254 | scm_define (sym_void, scm_from_uint8 (SCM_FOREIGN_TYPE_VOID)); |
1255 | scm_define (sym_float, scm_from_uint8 (SCM_FOREIGN_TYPE_FLOAT)); | |
1256 | scm_define (sym_double, scm_from_uint8 (SCM_FOREIGN_TYPE_DOUBLE)); | |
1257 | scm_define (sym_uint8, scm_from_uint8 (SCM_FOREIGN_TYPE_UINT8)); | |
1258 | scm_define (sym_int8, scm_from_uint8 (SCM_FOREIGN_TYPE_INT8)); | |
1259 | scm_define (sym_uint16, scm_from_uint8 (SCM_FOREIGN_TYPE_UINT16)); | |
1260 | scm_define (sym_int16, scm_from_uint8 (SCM_FOREIGN_TYPE_INT16)); | |
1261 | scm_define (sym_uint32, scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32)); | |
1262 | scm_define (sym_int32, scm_from_uint8 (SCM_FOREIGN_TYPE_INT32)); | |
1263 | scm_define (sym_uint64, scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64)); | |
1264 | scm_define (sym_int64, scm_from_uint8 (SCM_FOREIGN_TYPE_INT64)); | |
dd1464bf | 1265 | |
42f7c01e LC |
1266 | scm_define (sym_short, |
1267 | #if SIZEOF_SHORT == 8 | |
1268 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT64) | |
1269 | #elif SIZEOF_SHORT == 4 | |
1270 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT32) | |
1271 | #elif SIZEOF_SHORT == 2 | |
1272 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT16) | |
1273 | #else | |
1274 | # error unsupported sizeof (short) | |
1275 | #endif | |
1276 | ); | |
1277 | ||
1278 | scm_define (sym_unsigned_short, | |
1279 | #if SIZEOF_SHORT == 8 | |
1280 | scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64) | |
1281 | #elif SIZEOF_SHORT == 4 | |
1282 | scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32) | |
1283 | #elif SIZEOF_SHORT == 2 | |
1284 | scm_from_uint8 (SCM_FOREIGN_TYPE_UINT16) | |
1285 | #else | |
1286 | # error unsupported sizeof (short) | |
1287 | #endif | |
1288 | ); | |
1289 | ||
dd1464bf LC |
1290 | scm_define (sym_int, |
1291 | #if SIZEOF_INT == 8 | |
1292 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT64) | |
1293 | #elif SIZEOF_INT == 4 | |
1294 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT32) | |
1295 | #else | |
1296 | # error unsupported sizeof (int) | |
1297 | #endif | |
1298 | ); | |
1299 | ||
1300 | scm_define (sym_unsigned_int, | |
1301 | #if SIZEOF_UNSIGNED_INT == 8 | |
1302 | scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64) | |
1303 | #elif SIZEOF_UNSIGNED_INT == 4 | |
1304 | scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32) | |
1305 | #else | |
1306 | # error unsupported sizeof (unsigned int) | |
1307 | #endif | |
1308 | ); | |
1309 | ||
1310 | scm_define (sym_long, | |
1311 | #if SIZEOF_LONG == 8 | |
1312 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT64) | |
1313 | #elif SIZEOF_LONG == 4 | |
1314 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT32) | |
1315 | #else | |
1316 | # error unsupported sizeof (long) | |
1317 | #endif | |
1318 | ); | |
1319 | ||
1320 | scm_define (sym_unsigned_long, | |
1321 | #if SIZEOF_UNSIGNED_LONG == 8 | |
1322 | scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64) | |
1323 | #elif SIZEOF_UNSIGNED_LONG == 4 | |
1324 | scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32) | |
1325 | #else | |
1326 | # error unsupported sizeof (unsigned long) | |
1327 | #endif | |
1328 | ); | |
1329 | ||
1330 | scm_define (sym_size_t, | |
1331 | #if SIZEOF_SIZE_T == 8 | |
1332 | scm_from_uint8 (SCM_FOREIGN_TYPE_UINT64) | |
1333 | #elif SIZEOF_SIZE_T == 4 | |
1334 | scm_from_uint8 (SCM_FOREIGN_TYPE_UINT32) | |
1335 | #else | |
1336 | # error unsupported sizeof (size_t) | |
3a3bea72 MW |
1337 | #endif |
1338 | ); | |
1339 | ||
1340 | scm_define (sym_ssize_t, | |
1341 | #if SIZEOF_SIZE_T == 8 | |
1342 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT64) | |
1343 | #elif SIZEOF_SIZE_T == 4 | |
1344 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT32) | |
1345 | #else | |
1346 | # error unsupported sizeof (ssize_t) | |
1347 | #endif | |
1348 | ); | |
1349 | ||
1350 | scm_define (sym_ptrdiff_t, | |
1351 | #if SCM_SIZEOF_SCM_T_PTRDIFF == 8 | |
1352 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT64) | |
1353 | #elif SCM_SIZEOF_SCM_T_PTRDIFF == 4 | |
1354 | scm_from_uint8 (SCM_FOREIGN_TYPE_INT32) | |
1355 | #else | |
1356 | # error unsupported sizeof (scm_t_ptrdiff) | |
dd1464bf LC |
1357 | #endif |
1358 | ); | |
54eb59cf | 1359 | |
5b46a8c2 | 1360 | null_pointer = scm_cell (scm_tc7_pointer, 0); |
3e5ea35c | 1361 | scm_define (sym_null, null_pointer); |
ab4779ff AW |
1362 | } |
1363 | ||
1364 | void | |
1365 | scm_register_foreign (void) | |
1366 | { | |
44602b08 AW |
1367 | scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION, |
1368 | "scm_init_foreign", | |
ab4779ff AW |
1369 | (scm_t_extension_init_func)scm_init_foreign, |
1370 | NULL); | |
5b46a8c2 | 1371 | pointer_weak_refs = scm_make_weak_key_hash_table (SCM_UNDEFINED); |
e2c2a699 AW |
1372 | } |
1373 | ||
1374 | /* | |
1375 | Local Variables: | |
1376 | c-file-style: "gnu" | |
1377 | End: | |
1378 | */ |