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0f2d19dd JB |
1 | /* classes: h_files */ |
2 | ||
729dbac3 DH |
3 | #ifndef SCM___SCM_H |
4 | #define SCM___SCM_H | |
8c494e99 | 5 | |
e20d7001 | 6 | /* Copyright (C) 1995,1996,1998,1999,2000,2001,2002,2003, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
8c494e99 | 7 | * |
d3cf93bc | 8 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
9 | * modify it under the terms of the GNU Lesser General Public License |
10 | * as published by the Free Software Foundation; either version 3 of | |
11 | * the License, or (at your option) any later version. | |
8c494e99 | 12 | * |
53befeb7 NJ |
13 | * This library is distributed in the hope that it will be useful, but |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
d3cf93bc NJ |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | * Lesser General Public License for more details. | |
8c494e99 | 17 | * |
d3cf93bc NJ |
18 | * You should have received a copy of the GNU Lesser General Public |
19 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
21 | * 02110-1301 USA | |
d3cf93bc | 22 | */ |
8c494e99 | 23 | |
0f2d19dd | 24 | \f |
176067df | 25 | |
92e6989f RB |
26 | /********************************************************************** |
27 | This file is Guile's central public header. | |
28 | ||
29 | When included by other files, this file should preceed any include | |
30 | other than __scm.h. | |
31 | ||
32 | Under *NO* circumstances should new items be added to the global | |
33 | namespace (via adding #define, typedef, or similar to this file) with | |
34 | generic names. This usually means that any new names should be | |
35 | prefixed by either SCM_ or GUILE_. i.e. do *not* #define HAVE_FOO or | |
36 | SIZEOF_BAR. See configure.in, gen-scmconfig.h.in, and | |
37 | gen-scmconfig.c for examples of how to properly handle this issue. | |
38 | The main documentation is in gen-scmconfig.c. | |
39 | ||
40 | "What's the difference between _scm.h and __scm.h?" | |
176067df JB |
41 | |
42 | _scm.h is not installed; it's only visible to the libguile sources | |
92e6989f | 43 | themselves, and it includes config.h, the private config header. |
176067df JB |
44 | |
45 | __scm.h is installed, and is #included by <libguile.h>. If both | |
46 | the client and libguile need some piece of information, and it | |
47 | doesn't fit well into the header file for any particular module, it | |
92e6989f RB |
48 | should go in __scm.h. __scm.h includes scmconfig.h, the public |
49 | config header. | |
50 | **********************************************************************/ | |
51 | ||
52 | /* What did the configure script discover about the outside world? */ | |
53 | #include "libguile/scmconfig.h" | |
176067df | 54 | |
92e6989f | 55 | \f |
176067df | 56 | |
e81d98ec DH |
57 | /* {Compiler hints} |
58 | * | |
59 | * The following macros are used to provide additional information for the | |
60 | * compiler, which may help to do better error checking and code | |
61 | * optimization. A second benefit of these macros is, that they also provide | |
62 | * additional information to the developers. | |
63 | */ | |
64 | ||
65 | /* The macro SCM_NORETURN indicates that a function will never return. | |
66 | * Examples: | |
67 | * 1) int foo (char arg) SCM_NORETURN; | |
68 | */ | |
69 | #ifdef __GNUC__ | |
70 | #define SCM_NORETURN __attribute__ ((noreturn)) | |
71 | #else | |
72 | #define SCM_NORETURN | |
73 | #endif | |
74 | ||
75 | /* The macro SCM_UNUSED indicates that a function, function argument or | |
76 | * variable may potentially be unused. | |
77 | * Examples: | |
78 | * 1) static int unused_function (char arg) SCM_UNUSED; | |
79 | * 2) int foo (char unused_argument SCM_UNUSED); | |
80 | * 3) int unused_variable SCM_UNUSED; | |
81 | */ | |
82 | #ifdef __GNUC__ | |
83 | #define SCM_UNUSED __attribute__ ((unused)) | |
84 | #else | |
85 | #define SCM_UNUSED | |
86 | #endif | |
87 | ||
88 | ||
9cc37597 LC |
89 | /* The SCM_EXPECT macros provide branch prediction hints to the compiler. To |
90 | * use only in places where the result of the expression under "normal" | |
91 | * circumstances is known. */ | |
92 | #if defined(__GNUC__) && (__GNUC__ >= 3) | |
93 | # define SCM_EXPECT __builtin_expect | |
94 | #else | |
95 | # define SCM_EXPECT(_expr, _value) (_expr) | |
96 | #endif | |
97 | ||
98 | #define SCM_LIKELY(_expr) SCM_EXPECT ((_expr), 1) | |
99 | #define SCM_UNLIKELY(_expr) SCM_EXPECT ((_expr), 0) | |
100 | ||
102dbb6f | 101 | /* The SCM_INTERNAL macro makes it possible to explicitly declare a function |
442f3f20 AW |
102 | * as having "internal" linkage. However our current tack on this problem is |
103 | * to use GCC 4's -fvisibility=hidden, making functions internal by default, | |
104 | * and then SCM_API marks them for export. */ | |
105 | #define SCM_INTERNAL extern | |
102dbb6f | 106 | |
743b8872 LC |
107 | /* The SCM_DEPRECATED macro is used in declarations of deprecated functions |
108 | * or variables. Defining `SCM_BUILDING_DEPRECATED_CODE' allows deprecated | |
109 | * functions to be implemented in terms of deprecated functions, and allows | |
110 | * deprecated functions to be referred to by `scm_c_define_gsubr ()'. */ | |
111 | #if !defined (SCM_BUILDING_DEPRECATED_CODE) \ | |
112 | && defined (__GNUC__) && (__GNUC__ >= 3) | |
113 | # define SCM_DEPRECATED SCM_API __attribute__ ((__deprecated__)) | |
114 | #else | |
115 | # define SCM_DEPRECATED SCM_API | |
116 | #endif | |
117 | ||
c6054fea LC |
118 | /* The SCM_ALIGNED macro, when defined, can be used to instruct the compiler |
119 | * to honor the given alignment constraint. */ | |
731dd0ce | 120 | #if defined __GNUC__ |
c6054fea | 121 | # define SCM_ALIGNED(x) __attribute__ ((aligned (x))) |
731dd0ce | 122 | #elif defined __INTEL_COMPILER |
c6054fea LC |
123 | # define SCM_ALIGNED(x) __declspec (align (x)) |
124 | #else | |
125 | /* Don't know how to align things. */ | |
126 | # undef SCM_ALIGNED | |
127 | #endif | |
9cc37597 LC |
128 | |
129 | \f | |
0f2d19dd JB |
130 | /* {Supported Options} |
131 | * | |
132 | * These may be defined or undefined. | |
133 | */ | |
134 | ||
16d35552 | 135 | /* #define GUILE_DEBUG_FREELIST */ |
70d63753 | 136 | |
0f2d19dd JB |
137 | /* All the number support there is. |
138 | */ | |
0f2d19dd JB |
139 | #define BIGNUMS |
140 | ||
686765af ML |
141 | /* GC should relinquish empty cons-pair arenas. */ |
142 | /* cmm:FIXME look at this after done mangling the GC */ | |
143 | /* #define GC_FREE_SEGMENTS */ | |
0f2d19dd JB |
144 | |
145 | /* Provide a scheme-accessible count-down timer that | |
146 | * generates a pseudo-interrupt. | |
147 | */ | |
148 | #define TICKS | |
149 | ||
150 | ||
151 | /* Use engineering notation when converting numbers strings? | |
152 | */ | |
153 | #undef ENGNOT | |
154 | ||
0f2d19dd JB |
155 | \f |
156 | /* {Unsupported Options} | |
157 | * | |
3c205827 | 158 | * These must be defined as given here. |
0f2d19dd JB |
159 | */ |
160 | ||
161 | ||
3c205827 JB |
162 | /* Guile Scheme supports the #f/() distinction; Guile Lisp won't. We |
163 | have horrible plans for their unification. */ | |
164 | #undef SICP | |
0f2d19dd JB |
165 | |
166 | \f | |
167 | ||
80c78696 | 168 | /* Random options (not yet supported or in final form). */ |
0f2d19dd | 169 | |
80c78696 MD |
170 | #define STACK_CHECKING |
171 | #undef NO_CEVAL_STACK_CHECKING | |
0f2d19dd | 172 | |
43ff3170 | 173 | \f |
3a9809df | 174 | |
1174045c | 175 | /* SCM_API is a macro prepended to all function and data definitions |
442f3f20 AW |
176 | which should be exported from libguile. */ |
177 | ||
178 | #if BUILDING_LIBGUILE && HAVE_VISIBILITY | |
179 | # define SCM_API extern __attribute__((__visibility__("default"))) | |
180 | #elif BUILDING_LIBGUILE && defined _MSC_VER | |
181 | # define SCM_API __declspec(dllexport) extern | |
182 | #elif defined _MSC_VER | |
183 | # define SCM_API __declspec(dllimport) extern | |
1174045c MV |
184 | #else |
185 | # define SCM_API extern | |
186 | #endif | |
187 | ||
188 | \f | |
189 | ||
3a9809df DH |
190 | /* {Debugging Options} |
191 | * | |
192 | * These compile time options determine whether to include code that is only | |
193 | * useful for debugging guile itself or C level extensions to guile. The | |
194 | * common prefix for all option macros of this kind is "SCM_DEBUG_". It is | |
fce0b22d DH |
195 | * guaranteed that a macro named SCM_DEBUG_XXX is always defined (typically to |
196 | * either 0 or 1), i. e. there is no need to test for the undefined case. | |
197 | * This allows to use these definitions comfortably within code, as in the | |
198 | * following example: | |
3a9809df DH |
199 | * #define FOO do { if (SCM_DEBUG_XXX) bar(); else baz(); } while (0) |
200 | * Any sane compiler will remove the unused branch without any performance | |
201 | * penalty for the resulting code. | |
202 | * | |
203 | * Note: Some SCM_DEBUG_XXX options are not settable at configure time. | |
204 | * To change the value of such options you will have to edit this header | |
56100716 DH |
205 | * file or give suitable options to make, like: |
206 | * make all CFLAGS="-DSCM_DEBUG_XXX=1 ..." | |
3a9809df DH |
207 | */ |
208 | ||
209 | ||
c8a54c4b DH |
210 | /* The value of SCM_DEBUG determines the default for most of the not yet |
211 | * defined debugging options. This allows, for example, to enable most of the | |
212 | * debugging options by simply defining SCM_DEBUG as 1. | |
213 | */ | |
214 | #ifndef SCM_DEBUG | |
215 | #define SCM_DEBUG 0 | |
216 | #endif | |
217 | ||
7ddb9baf HWN |
218 | /* For debugging purposes: define this is to ensure nobody is using |
219 | * the mark bits outside of the marking phase. This is meant for | |
220 | * debugging purposes only. | |
221 | */ | |
222 | #ifndef SCM_DEBUG_MARKING_API | |
223 | #define SCM_DEBUG_MARKING_API 0 | |
224 | #endif | |
225 | ||
46d53380 DH |
226 | /* If SCM_DEBUG_CELL_ACCESSES is set to 1, cell accesses will perform |
227 | * exhaustive parameter checking: It will be verified that cell parameters | |
228 | * actually point to a valid heap cell. Note: If this option is enabled, | |
229 | * guile will run about ten times slower than normally. | |
230 | */ | |
231 | #ifndef SCM_DEBUG_CELL_ACCESSES | |
232 | #define SCM_DEBUG_CELL_ACCESSES SCM_DEBUG | |
233 | #endif | |
234 | ||
216eedfc DH |
235 | /* If SCM_DEBUG_INTERRUPTS is set to 1, with every deferring and allowing of |
236 | * interrupts a consistency check will be performed. | |
237 | */ | |
238 | #ifndef SCM_DEBUG_INTERRUPTS | |
239 | #define SCM_DEBUG_INTERRUPTS SCM_DEBUG | |
240 | #endif | |
241 | ||
e81d98ec DH |
242 | /* If SCM_DEBUG_PAIR_ACCESSES is set to 1, accesses to cons cells will be |
243 | * exhaustively checked. Note: If this option is enabled, guile will run | |
244 | * slower than normally. | |
245 | */ | |
246 | #ifndef SCM_DEBUG_PAIR_ACCESSES | |
247 | #define SCM_DEBUG_PAIR_ACCESSES SCM_DEBUG | |
248 | #endif | |
249 | ||
af45e3b0 DH |
250 | /* If SCM_DEBUG_REST_ARGUMENT is set to 1, functions that take rest arguments |
251 | * will check whether the rest arguments are actually passed as a proper list. | |
252 | * Otherwise, if SCM_DEBUG_REST_ARGUMENT is 0, functions that take rest | |
253 | * arguments will take it for granted that these are passed as a proper list. | |
c8a54c4b | 254 | */ |
af45e3b0 DH |
255 | #ifndef SCM_DEBUG_REST_ARGUMENT |
256 | #define SCM_DEBUG_REST_ARGUMENT SCM_DEBUG | |
3a9809df DH |
257 | #endif |
258 | ||
fce0b22d DH |
259 | /* The macro SCM_DEBUG_TYPING_STRICTNESS indicates what level of type checking |
260 | * shall be performed with respect to the use of the SCM datatype. The macro | |
261 | * may be defined to one of the values 0, 1 and 2. | |
262 | * | |
263 | * A value of 0 means that there will be no compile time type checking, since | |
264 | * the SCM datatype will be declared as an integral type. This setting should | |
265 | * only be used on systems, where casting from integral types to pointers may | |
266 | * lead to loss of bit information. | |
267 | * | |
268 | * A value of 1 means that there will an intermediate level of compile time | |
269 | * type checking, since the SCM datatype will be declared as a pointer to an | |
270 | * undefined struct. This setting is the default, since it does not cost | |
271 | * anything in terms of performance or code size. | |
272 | * | |
273 | * A value of 2 provides a maximum level of compile time type checking since | |
274 | * the SCM datatype will be declared as a struct. This setting should be used | |
275 | * for _compile time_ type checking only, since the compiled result is likely | |
276 | * to be quite inefficient. The right way to make use of this option is to do | |
277 | * a 'make clean; make CFLAGS=-DSCM_DEBUG_TYPING_STRICTNESS=2', fix your | |
56100716 | 278 | * errors, and then do 'make clean; make'. |
c8a54c4b | 279 | */ |
56100716 | 280 | #ifndef SCM_DEBUG_TYPING_STRICTNESS |
729dbac3 | 281 | #define SCM_DEBUG_TYPING_STRICTNESS 1 |
56100716 DH |
282 | #endif |
283 | ||
d0624e39 DH |
284 | /* If SCM_DEBUG_DEBUGGING_SUPPORT is set to 1, guile will provide a set of |
285 | * special functions that support debugging with a debugger like gdb or | |
286 | * debugging of guile internals on the scheme level. The behaviour of guile | |
287 | * is not changed by this macro, only the set of functions that are available | |
288 | * will differ. All functions that are introduced this way have the prefix | |
289 | * 'scm_dbg_' on the C level and the prefix 'dbg-' on the scheme level. This | |
290 | * allows to easily determine the set of support functions, given that your | |
291 | * debugger or repl provide automatic name completion. Note that these | |
292 | * functions are intended to be used during interactive debugging sessions | |
293 | * only. They are not considered part of guile's official API. They may | |
294 | * change or disappear without notice or deprecation phase. | |
94fb5a6e | 295 | */ |
d0624e39 DH |
296 | #ifndef SCM_DEBUG_DEBUGGING_SUPPORT |
297 | #define SCM_DEBUG_DEBUGGING_SUPPORT SCM_DEBUG | |
94fb5a6e DH |
298 | #endif |
299 | ||
3a9809df DH |
300 | \f |
301 | ||
8c494e99 DH |
302 | /* {Feature Options} |
303 | * | |
304 | * These compile time options determine whether code for certain features | |
305 | * should be compiled into guile. The common prefix for all option macros | |
306 | * of this kind is "SCM_ENABLE_". It is guaranteed that a macro named | |
307 | * SCM_ENABLE_XXX is defined to be either 0 or 1, i. e. there is no need to | |
308 | * test for the undefined case. This allows to use these definitions | |
309 | * comfortably within code, as in the following example: | |
310 | * #define FOO do { if (SCM_ENABLE_XXX) bar(); else baz(); } while (0) | |
311 | * Any sane compiler will remove the unused branch without any performance | |
312 | * penalty for the resulting code. | |
313 | * | |
314 | * Note: Some SCM_ENABLE_XXX options are not settable at configure time. | |
315 | * To change the value of such options you will have to edit this header | |
316 | * file or give suitable options to make, like: | |
317 | * make all CFLAGS="-DSCM_ENABLE_XXX=1 ..." | |
0f2d19dd | 318 | */ |
1be6b49c | 319 | |
8c494e99 DH |
320 | /* If SCM_ENABLE_DEPRECATED is set to 1, deprecated code will be included in |
321 | * guile, as well as some functions to issue run-time warnings about uses of | |
322 | * deprecated functions. | |
323 | */ | |
324 | #ifndef SCM_ENABLE_DEPRECATED | |
325 | #define SCM_ENABLE_DEPRECATED 0 | |
1be6b49c | 326 | #endif |
0f2d19dd | 327 | |
b971d089 | 328 | \f |
0f2d19dd | 329 | |
5c75b29f | 330 | /* {Architecture and compiler properties} |
0f2d19dd | 331 | * |
5c75b29f DH |
332 | * Guile as of today can only work on systems which fulfill at least the |
333 | * following requirements: | |
59c4bb82 DH |
334 | * |
335 | * - scm_t_bits and SCM variables have at least 32 bits. | |
5c75b29f | 336 | * Guile's type system is based on this assumption. |
59c4bb82 DH |
337 | * |
338 | * - sizeof (scm_t_bits) >= sizeof (void*) and sizeof (SCM) >= sizeof (void*) | |
339 | * Guile's type system is based on this assumption, since it must be | |
340 | * possible to store pointers to cells on the heap in scm_t_bits and SCM | |
341 | * variables. | |
342 | * | |
343 | * - sizeof (scm_t_bits) >= 4 and sizeof (scm_t_bits) is a power of 2. | |
344 | * Guile's type system is based on this assumption. In particular, it is | |
345 | * assumed that cells, i. e. pairs of scm_t_bits variables, are eight | |
346 | * character aligned. This is because three bits of a scm_t_bits variable | |
347 | * that is holding a pointer to a cell on the heap must be available for | |
348 | * storing type data. | |
349 | * | |
350 | * - sizeof (scm_t_bits) <= sizeof (void*) and sizeof (SCM) <= sizeof (void*) | |
351 | * In some parts of guile, scm_t_bits and SCM variables are passed to | |
352 | * functions as void* arguments. Together with the requirement above, this | |
353 | * requires a one-to-one correspondence between the size of a void* and the | |
354 | * sizes of scm_t_bits and SCM variables. | |
355 | * | |
5c75b29f DH |
356 | * - numbers are encoded using two's complement. |
357 | * The implementation of the bitwise scheme level operations is based on | |
358 | * this assumption. | |
59c4bb82 | 359 | * |
5c75b29f | 360 | * - ... add more |
0f2d19dd JB |
361 | */ |
362 | ||
5c75b29f DH |
363 | #ifdef CHAR_BIT |
364 | # define SCM_CHAR_BIT CHAR_BIT | |
365 | #else | |
366 | # define SCM_CHAR_BIT 8 | |
367 | #endif | |
368 | ||
369 | #ifdef LONG_BIT | |
370 | # define SCM_LONG_BIT LONG_BIT | |
371 | #else | |
372 | # define SCM_LONG_BIT (SCM_CHAR_BIT * sizeof (long) / sizeof (char)) | |
373 | #endif | |
374 | ||
375 | #ifdef UCHAR_MAX | |
376 | # define SCM_CHAR_CODE_LIMIT (UCHAR_MAX + 1L) | |
0f2d19dd | 377 | #else |
e2806c10 | 378 | # define SCM_CHAR_CODE_LIMIT 256L |
5c75b29f DH |
379 | #endif |
380 | ||
e88d45aa MV |
381 | #define SCM_I_UTYPE_MAX(type) ((type)-1) |
382 | #define SCM_I_TYPE_MAX(type,umax) ((type)((umax)/2)) | |
383 | #define SCM_I_TYPE_MIN(type,umax) (-((type)((umax)/2))-1) | |
384 | ||
385 | #define SCM_T_UINT8_MAX SCM_I_UTYPE_MAX(scm_t_uint8) | |
386 | #define SCM_T_INT8_MIN SCM_I_TYPE_MIN(scm_t_int8,SCM_T_UINT8_MAX) | |
387 | #define SCM_T_INT8_MAX SCM_I_TYPE_MAX(scm_t_int8,SCM_T_UINT8_MAX) | |
388 | ||
389 | #define SCM_T_UINT16_MAX SCM_I_UTYPE_MAX(scm_t_uint16) | |
390 | #define SCM_T_INT16_MIN SCM_I_TYPE_MIN(scm_t_int16,SCM_T_UINT16_MAX) | |
391 | #define SCM_T_INT16_MAX SCM_I_TYPE_MAX(scm_t_int16,SCM_T_UINT16_MAX) | |
392 | ||
393 | #define SCM_T_UINT32_MAX SCM_I_UTYPE_MAX(scm_t_uint32) | |
394 | #define SCM_T_INT32_MIN SCM_I_TYPE_MIN(scm_t_int32,SCM_T_UINT32_MAX) | |
395 | #define SCM_T_INT32_MAX SCM_I_TYPE_MAX(scm_t_int32,SCM_T_UINT32_MAX) | |
396 | ||
397 | #if SCM_HAVE_T_INT64 | |
398 | #define SCM_T_UINT64_MAX SCM_I_UTYPE_MAX(scm_t_uint64) | |
399 | #define SCM_T_INT64_MIN SCM_I_TYPE_MIN(scm_t_int64,SCM_T_UINT64_MAX) | |
400 | #define SCM_T_INT64_MAX SCM_I_TYPE_MAX(scm_t_int64,SCM_T_UINT64_MAX) | |
401 | #endif | |
402 | ||
403 | #if SCM_SIZEOF_LONG_LONG | |
404 | #define SCM_I_ULLONG_MAX SCM_I_UTYPE_MAX(unsigned long long) | |
405 | #define SCM_I_LLONG_MIN SCM_I_TYPE_MIN(long long,SCM_I_ULLONG_MAX) | |
406 | #define SCM_I_LLONG_MAX SCM_I_TYPE_MAX(long long,SCM_I_ULLONG_MAX) | |
407 | #endif | |
408 | ||
409 | #define SCM_T_UINTMAX_MAX SCM_I_UTYPE_MAX(scm_t_uintmax) | |
410 | #define SCM_T_INTMAX_MIN SCM_I_TYPE_MIN(scm_t_intmax,SCM_T_UINTMAX_MAX) | |
411 | #define SCM_T_INTMAX_MAX SCM_I_TYPE_MAX(scm_t_intmax,SCM_T_UINTMAX_MAX) | |
412 | ||
413 | #define SCM_I_SIZE_MAX SCM_I_UTYPE_MAX(size_t) | |
414 | #define SCM_I_SSIZE_MIN SCM_I_TYPE_MIN(ssize_t,SCM_I_SIZE_MAX) | |
415 | #define SCM_I_SSIZE_MAX SCM_I_TYPE_MAX(ssize_t,SCM_I_SIZE_MAX) | |
416 | ||
0f2d19dd JB |
417 | \f |
418 | ||
2a1d8241 | 419 | #include "libguile/tags.h" |
0f2d19dd JB |
420 | |
421 | \f | |
422 | #ifdef vms | |
423 | # ifndef CHEAP_CONTINUATIONS | |
424 | typedef int jmp_buf[17]; | |
425 | extern int setjump(jmp_buf env); | |
426 | extern int longjump(jmp_buf env, int ret); | |
427 | # define setjmp setjump | |
428 | # define longjmp longjump | |
429 | # else | |
430 | # include <setjmp.h> | |
431 | # endif | |
432 | #else /* ndef vms */ | |
433 | # ifdef _CRAY1 | |
434 | typedef int jmp_buf[112]; | |
435 | extern int setjump(jmp_buf env); | |
436 | extern int longjump(jmp_buf env, int ret); | |
437 | # define setjmp setjump | |
438 | # define longjmp longjump | |
439 | # else /* ndef _CRAY1 */ | |
346e4402 NJ |
440 | # if defined (__ia64__) |
441 | /* For IA64, emulate the setjmp API using getcontext. */ | |
442 | # include <signal.h> | |
443 | # include <ucontext.h> | |
444 | typedef struct { | |
445 | ucontext_t ctx; | |
446 | int fresh; | |
a4dbe1ac NJ |
447 | } scm_i_jmp_buf; |
448 | # define SCM_I_SETJMP(JB) \ | |
346e4402 NJ |
449 | ( (JB).fresh = 1, \ |
450 | getcontext (&((JB).ctx)), \ | |
451 | ((JB).fresh ? ((JB).fresh = 0, 0) : 1) ) | |
a4dbe1ac NJ |
452 | # define SCM_I_LONGJMP(JB,VAL) scm_ia64_longjmp (&(JB), VAL) |
453 | void scm_ia64_longjmp (scm_i_jmp_buf *, int); | |
346e4402 NJ |
454 | # else /* ndef __ia64__ */ |
455 | # include <setjmp.h> | |
456 | # endif /* ndef __ia64__ */ | |
0f2d19dd JB |
457 | # endif /* ndef _CRAY1 */ |
458 | #endif /* ndef vms */ | |
459 | ||
a4dbe1ac NJ |
460 | /* For any platform where SCM_I_SETJMP hasn't been defined in some |
461 | special way above, map SCM_I_SETJMP, SCM_I_LONGJMP and | |
462 | scm_i_jmp_buf to setjmp, longjmp and jmp_buf. */ | |
463 | #ifndef SCM_I_SETJMP | |
464 | #define scm_i_jmp_buf jmp_buf | |
465 | #define SCM_I_SETJMP setjmp | |
466 | #define SCM_I_LONGJMP longjmp | |
467 | #endif | |
468 | ||
0f2d19dd JB |
469 | /* James Clark came up with this neat one instruction fix for |
470 | * continuations on the SPARC. It flushes the register windows so | |
3dd84ef1 | 471 | * that all the state of the process is contained in the stack. |
0f2d19dd JB |
472 | */ |
473 | ||
7c12f0ac | 474 | #if defined (sparc) || defined (__sparc__) || defined (__sparc) |
0f2d19dd JB |
475 | # define SCM_FLUSH_REGISTER_WINDOWS asm("ta 3") |
476 | #else | |
477 | # define SCM_FLUSH_REGISTER_WINDOWS /* empty */ | |
478 | #endif | |
479 | ||
3dd84ef1 | 480 | /* If stack is not longword aligned then |
0f2d19dd JB |
481 | */ |
482 | ||
483 | /* #define SHORT_ALIGN */ | |
484 | #ifdef THINK_C | |
485 | # define SHORT_ALIGN | |
486 | #endif | |
487 | #ifdef MSDOS | |
488 | # define SHORT_ALIGN | |
489 | #endif | |
490 | #ifdef atarist | |
491 | # define SHORT_ALIGN | |
492 | #endif | |
493 | ||
494 | #ifdef SHORT_ALIGN | |
495 | typedef short SCM_STACKITEM; | |
496 | #else | |
497 | typedef long SCM_STACKITEM; | |
498 | #endif | |
79f55b7c MD |
499 | |
500 | /* Cast pointer through (void *) in order to avoid compiler warnings | |
501 | when strict aliasing is enabled */ | |
502 | #define SCM_STACK_PTR(ptr) ((SCM_STACKITEM *) (void *) (ptr)) | |
0f2d19dd JB |
503 | \f |
504 | ||
46935a1f LC |
505 | SCM_API void scm_async_tick (void); |
506 | ||
507 | #ifdef BUILDING_LIBGUILE | |
508 | ||
509 | /* FIXME: should change names */ | |
510 | # define SCM_ASYNC_TICK \ | |
511 | do \ | |
512 | { \ | |
513 | if (SCM_I_CURRENT_THREAD->pending_asyncs) \ | |
514 | scm_async_click (); \ | |
515 | } \ | |
516 | while (0) | |
517 | ||
518 | #else /* !BUILDING_LIBGUILE */ | |
519 | ||
520 | # define SCM_ASYNC_TICK (scm_async_tick ()) | |
521 | ||
522 | #endif /* !BUILDING_LIBGUILE */ | |
25d3ee9d | 523 | |
0f2d19dd | 524 | |
8417b665 JB |
525 | /* Anthony Green writes: |
526 | When the compiler sees... | |
527 | DEFER_INTS; | |
528 | [critical code here] | |
529 | ALLOW_INTS; | |
530 | ...it doesn't actually promise to keep the critical code within the | |
531 | boundries of the DEFER/ALLOW_INTS instructions. It may very well | |
532 | schedule it outside of the magic defined in those macros. | |
533 | ||
534 | However, GCC's volatile asm feature forms a barrier over which code is | |
535 | never moved. So if you add... | |
35eec738 JB |
536 | asm (""); |
537 | ...to each of the DEFER_INTS and ALLOW_INTS macros, the critical | |
538 | code will always remain in place. asm's without inputs or outputs | |
539 | are implicitly volatile. */ | |
8417b665 | 540 | #ifdef __GNUC__ |
35eec738 | 541 | #define SCM_FENCE asm /* volatile */ ("") |
189b66ba MV |
542 | #elif defined (__INTEL_COMPILER) && defined (__ia64) |
543 | #define SCM_FENCE __memory_barrier() | |
8417b665 JB |
544 | #else |
545 | #define SCM_FENCE | |
546 | #endif | |
547 | ||
c72cc5fb | 548 | #define SCM_TICK \ |
bfc69694 | 549 | do { \ |
cd911565 | 550 | SCM_ASYNC_TICK; \ |
216eedfc | 551 | SCM_THREAD_SWITCHING_CODE; \ |
bfc69694 | 552 | } while (0) |
0f2d19dd JB |
553 | |
554 | \f | |
555 | ||
556 | /** SCM_ASSERT | |
3dd84ef1 | 557 | ** |
0f2d19dd JB |
558 | **/ |
559 | ||
560 | ||
561 | #ifdef SCM_RECKLESS | |
562 | #define SCM_ASSERT(_cond, _arg, _pos, _subr) | |
23deee81 | 563 | #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr, _msg) |
0f2d19dd JB |
564 | #define SCM_ASRTGO(_cond, _label) |
565 | #else | |
9cc37597 LC |
566 | #define SCM_ASSERT(_cond, _arg, _pos, _subr) \ |
567 | do { if (SCM_UNLIKELY (!(_cond))) \ | |
aeb4c2e1 | 568 | scm_wrong_type_arg (_subr, _pos, _arg); } while (0) |
9cc37597 LC |
569 | #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr, _msg) \ |
570 | do { if (SCM_UNLIKELY (!(_cond))) \ | |
aeb4c2e1 | 571 | scm_wrong_type_arg_msg(_subr, _pos, _arg, _msg); } while (0) |
9cc37597 LC |
572 | #define SCM_ASRTGO(_cond, _label) \ |
573 | do { if (SCM_UNLIKELY (!(_cond))) \ | |
aeb4c2e1 | 574 | goto _label; } while (0) |
0f2d19dd | 575 | #endif |
95b88819 | 576 | |
9de33deb MD |
577 | /* |
578 | * SCM_WTA_DISPATCH | |
579 | */ | |
580 | ||
451e591c DH |
581 | /* Dirk:FIXME:: In all of the SCM_WTA_DISPATCH_* macros it is assumed that |
582 | * 'gf' is zero if uninitialized. It would be cleaner if some valid SCM value | |
583 | * like SCM_BOOL_F or SCM_UNDEFINED was chosen. | |
584 | */ | |
585 | ||
1174045c | 586 | SCM_API SCM scm_call_generic_0 (SCM gf); |
b3c8a0f5 | 587 | |
e68fc829 | 588 | #define SCM_WTA_DISPATCH_0(gf, subr) \ |
c07b3fef MD |
589 | return (SCM_UNPACK (gf) \ |
590 | ? scm_call_generic_0 ((gf)) \ | |
e68fc829 | 591 | : (scm_error_num_args_subr ((subr)), SCM_UNSPECIFIED)) |
9cc37597 LC |
592 | #define SCM_GASSERT0(cond, gf, subr) \ |
593 | if (SCM_UNLIKELY(!(cond))) \ | |
594 | SCM_WTA_DISPATCH_0((gf), (subr)) | |
b3c8a0f5 | 595 | |
1174045c | 596 | SCM_API SCM scm_call_generic_1 (SCM gf, SCM a1); |
9de33deb | 597 | |
c07b3fef MD |
598 | #define SCM_WTA_DISPATCH_1(gf, a1, pos, subr) \ |
599 | return (SCM_UNPACK (gf) \ | |
600 | ? scm_call_generic_1 ((gf), (a1)) \ | |
601 | : (scm_wrong_type_arg ((subr), (pos), (a1)), SCM_UNSPECIFIED)) | |
0193377d MG |
602 | |
603 | /* This form is for dispatching a subroutine. */ | |
604 | #define SCM_WTA_DISPATCH_1_SUBR(subr, a1, pos) \ | |
605 | return (SCM_UNPACK ((*SCM_SUBR_GENERIC (subr))) \ | |
606 | ? scm_call_generic_1 ((*SCM_SUBR_GENERIC (subr)), (a1)) \ | |
607 | : (scm_i_wrong_type_arg_symbol (SCM_SUBR_NAME (subr), (pos), (a1)), SCM_UNSPECIFIED)) | |
608 | ||
9cc37597 LC |
609 | #define SCM_GASSERT1(cond, gf, a1, pos, subr) \ |
610 | if (SCM_UNLIKELY (!(cond))) \ | |
611 | SCM_WTA_DISPATCH_1((gf), (a1), (pos), (subr)) | |
9de33deb | 612 | |
1174045c | 613 | SCM_API SCM scm_call_generic_2 (SCM gf, SCM a1, SCM a2); |
9de33deb | 614 | |
c07b3fef MD |
615 | #define SCM_WTA_DISPATCH_2(gf, a1, a2, pos, subr) \ |
616 | return (SCM_UNPACK (gf) \ | |
617 | ? scm_call_generic_2 ((gf), (a1), (a2)) \ | |
618 | : (scm_wrong_type_arg ((subr), (pos), \ | |
619 | (pos) == SCM_ARG1 ? (a1) : (a2)), \ | |
620 | SCM_UNSPECIFIED)) | |
9cc37597 LC |
621 | #define SCM_GASSERT2(cond, gf, a1, a2, pos, subr) \ |
622 | if (SCM_UNLIKELY (!(cond))) \ | |
623 | SCM_WTA_DISPATCH_2((gf), (a1), (a2), (pos), (subr)) | |
9de33deb | 624 | |
1174045c | 625 | SCM_API SCM scm_apply_generic (SCM gf, SCM args); |
89c358b1 | 626 | |
c07b3fef MD |
627 | #define SCM_WTA_DISPATCH_n(gf, args, pos, subr) \ |
628 | return (SCM_UNPACK (gf) \ | |
629 | ? scm_apply_generic ((gf), (args)) \ | |
630 | : (scm_wrong_type_arg ((subr), (pos), \ | |
631 | scm_list_ref ((args), \ | |
93ccaef0 | 632 | scm_from_int ((pos) - 1))), \ |
c07b3fef | 633 | SCM_UNSPECIFIED)) |
9cc37597 LC |
634 | #define SCM_GASSERTn(cond, gf, args, pos, subr) \ |
635 | if (SCM_UNLIKELY (!(cond))) \ | |
636 | SCM_WTA_DISPATCH_n((gf), (args), (pos), (subr)) | |
89c358b1 | 637 | |
c751e5e3 GB |
638 | #ifndef SCM_MAGIC_SNARFER |
639 | /* Let these macros pass through if | |
640 | we are snarfing; thus we can tell the | |
641 | difference between the use of an actual | |
642 | number vs. the use of one of these macros -- | |
f5421cfc | 643 | actual numbers in SCM_VALIDATE_* and SCM_ASSERT |
c751e5e3 GB |
644 | constructs must match the formal argument name, |
645 | but using SCM_ARG* avoids the test */ | |
646 | ||
0f2d19dd JB |
647 | #define SCM_ARGn 0 |
648 | #define SCM_ARG1 1 | |
649 | #define SCM_ARG2 2 | |
650 | #define SCM_ARG3 3 | |
651 | #define SCM_ARG4 4 | |
652 | #define SCM_ARG5 5 | |
1146b6cd | 653 | #define SCM_ARG6 6 |
3dd84ef1 | 654 | #define SCM_ARG7 7 |
0f2d19dd | 655 | |
c751e5e3 | 656 | #endif /* SCM_MAGIC_SNARFER */ |
0f2d19dd | 657 | |
0f2d19dd JB |
658 | \f |
659 | ||
660 | /* SCM_EXIT_SUCCESS is the default code to return from SCM if no errors | |
661 | * were encountered. SCM_EXIT_FAILURE is the default code to return from | |
662 | * SCM if errors were encountered. The return code can be explicitly | |
663 | * specified in a SCM program with (scm_quit <n>). | |
664 | */ | |
665 | ||
666 | #ifndef SCM_EXIT_SUCCESS | |
667 | #ifdef vms | |
668 | #define SCM_EXIT_SUCCESS 1 | |
669 | #else | |
670 | #define SCM_EXIT_SUCCESS 0 | |
671 | #endif /* def vms */ | |
672 | #endif /* ndef SCM_EXIT_SUCCESS */ | |
673 | #ifndef SCM_EXIT_FAILURE | |
674 | #ifdef vms | |
675 | #define SCM_EXIT_FAILURE 2 | |
676 | #else | |
677 | #define SCM_EXIT_FAILURE 1 | |
678 | #endif /* def vms */ | |
679 | #endif /* ndef SCM_EXIT_FAILURE */ | |
680 | ||
570b6821 MV |
681 | /* Define SCM_C_INLINE_KEYWORD so that it can be used as a replacement |
682 | for the "inline" keyword, expanding to nothing when "inline" is not | |
683 | available. | |
684 | */ | |
685 | ||
686 | #ifdef SCM_C_INLINE | |
687 | #define SCM_C_INLINE_KEYWORD SCM_C_INLINE | |
688 | #else | |
689 | #define SCM_C_INLINE_KEYWORD | |
690 | #endif | |
691 | ||
705edb95 LC |
692 | /* Handling thread-local storage (TLS). */ |
693 | ||
694 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS | |
695 | # define SCM_THREAD_LOCAL __thread | |
696 | #else | |
697 | # define SCM_THREAD_LOCAL | |
698 | #endif | |
699 | ||
729dbac3 | 700 | #endif /* SCM___SCM_H */ |
89e00824 ML |
701 | |
702 | /* | |
703 | Local Variables: | |
704 | c-file-style: "gnu" | |
705 | End: | |
706 | */ |