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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 | |
d3cf93bc | 6 | /* Copyright (C) 1995,1996,1998,1999,2000,2001,2002,2003, 2006, 2007, 2008 Free Software Foundation, Inc. |
8c494e99 | 7 | * |
d3cf93bc NJ |
8 | * This library is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
8c494e99 | 12 | * |
d3cf93bc | 13 | * This library is distributed in the hope that it will be useful, |
0f2d19dd | 14 | * but 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 | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
8c494e99 | 22 | |
0f2d19dd | 23 | \f |
176067df | 24 | |
92e6989f RB |
25 | /********************************************************************** |
26 | This file is Guile's central public header. | |
27 | ||
28 | When included by other files, this file should preceed any include | |
29 | other than __scm.h. | |
30 | ||
31 | Under *NO* circumstances should new items be added to the global | |
32 | namespace (via adding #define, typedef, or similar to this file) with | |
33 | generic names. This usually means that any new names should be | |
34 | prefixed by either SCM_ or GUILE_. i.e. do *not* #define HAVE_FOO or | |
35 | SIZEOF_BAR. See configure.in, gen-scmconfig.h.in, and | |
36 | gen-scmconfig.c for examples of how to properly handle this issue. | |
37 | The main documentation is in gen-scmconfig.c. | |
38 | ||
39 | "What's the difference between _scm.h and __scm.h?" | |
176067df JB |
40 | |
41 | _scm.h is not installed; it's only visible to the libguile sources | |
92e6989f | 42 | themselves, and it includes config.h, the private config header. |
176067df JB |
43 | |
44 | __scm.h is installed, and is #included by <libguile.h>. If both | |
45 | the client and libguile need some piece of information, and it | |
46 | doesn't fit well into the header file for any particular module, it | |
92e6989f RB |
47 | should go in __scm.h. __scm.h includes scmconfig.h, the public |
48 | config header. | |
49 | **********************************************************************/ | |
50 | ||
51 | /* What did the configure script discover about the outside world? */ | |
52 | #include "libguile/scmconfig.h" | |
176067df | 53 | |
92e6989f | 54 | \f |
176067df | 55 | |
e81d98ec DH |
56 | /* {Compiler hints} |
57 | * | |
58 | * The following macros are used to provide additional information for the | |
59 | * compiler, which may help to do better error checking and code | |
60 | * optimization. A second benefit of these macros is, that they also provide | |
61 | * additional information to the developers. | |
62 | */ | |
63 | ||
64 | /* The macro SCM_NORETURN indicates that a function will never return. | |
65 | * Examples: | |
66 | * 1) int foo (char arg) SCM_NORETURN; | |
67 | */ | |
68 | #ifdef __GNUC__ | |
69 | #define SCM_NORETURN __attribute__ ((noreturn)) | |
70 | #else | |
71 | #define SCM_NORETURN | |
72 | #endif | |
73 | ||
74 | /* The macro SCM_UNUSED indicates that a function, function argument or | |
75 | * variable may potentially be unused. | |
76 | * Examples: | |
77 | * 1) static int unused_function (char arg) SCM_UNUSED; | |
78 | * 2) int foo (char unused_argument SCM_UNUSED); | |
79 | * 3) int unused_variable SCM_UNUSED; | |
80 | */ | |
81 | #ifdef __GNUC__ | |
82 | #define SCM_UNUSED __attribute__ ((unused)) | |
83 | #else | |
84 | #define SCM_UNUSED | |
85 | #endif | |
86 | ||
87 | ||
9cc37597 LC |
88 | /* The SCM_EXPECT macros provide branch prediction hints to the compiler. To |
89 | * use only in places where the result of the expression under "normal" | |
90 | * circumstances is known. */ | |
91 | #if defined(__GNUC__) && (__GNUC__ >= 3) | |
92 | # define SCM_EXPECT __builtin_expect | |
93 | #else | |
94 | # define SCM_EXPECT(_expr, _value) (_expr) | |
95 | #endif | |
96 | ||
97 | #define SCM_LIKELY(_expr) SCM_EXPECT ((_expr), 1) | |
98 | #define SCM_UNLIKELY(_expr) SCM_EXPECT ((_expr), 0) | |
99 | ||
102dbb6f LC |
100 | /* The SCM_INTERNAL macro makes it possible to explicitly declare a function |
101 | * as having "internal" linkage. */ | |
102 | #if (defined __GNUC__) && \ | |
103 | ((__GNUC__ >= 4) || (__GNUC__ == 3 && __GNUC_MINOR__ == 3)) | |
3e28462f | 104 | # define SCM_INTERNAL extern __attribute__ ((__visibility__ ("internal"))) |
102dbb6f | 105 | #else |
3e28462f | 106 | # define SCM_INTERNAL extern |
102dbb6f LC |
107 | #endif |
108 | ||
9cc37597 LC |
109 | |
110 | \f | |
0f2d19dd JB |
111 | /* {Supported Options} |
112 | * | |
113 | * These may be defined or undefined. | |
114 | */ | |
115 | ||
16d35552 | 116 | /* #define GUILE_DEBUG_FREELIST */ |
70d63753 | 117 | |
0f2d19dd JB |
118 | /* All the number support there is. |
119 | */ | |
0f2d19dd JB |
120 | #define BIGNUMS |
121 | ||
686765af ML |
122 | /* GC should relinquish empty cons-pair arenas. */ |
123 | /* cmm:FIXME look at this after done mangling the GC */ | |
124 | /* #define GC_FREE_SEGMENTS */ | |
0f2d19dd JB |
125 | |
126 | /* Provide a scheme-accessible count-down timer that | |
127 | * generates a pseudo-interrupt. | |
128 | */ | |
129 | #define TICKS | |
130 | ||
131 | ||
132 | /* Use engineering notation when converting numbers strings? | |
133 | */ | |
134 | #undef ENGNOT | |
135 | ||
0f2d19dd JB |
136 | \f |
137 | /* {Unsupported Options} | |
138 | * | |
3c205827 | 139 | * These must be defined as given here. |
0f2d19dd JB |
140 | */ |
141 | ||
142 | ||
143 | #define CCLO | |
3c205827 JB |
144 | |
145 | /* Guile Scheme supports the #f/() distinction; Guile Lisp won't. We | |
146 | have horrible plans for their unification. */ | |
147 | #undef SICP | |
0f2d19dd JB |
148 | |
149 | \f | |
150 | ||
80c78696 | 151 | /* Random options (not yet supported or in final form). */ |
0f2d19dd | 152 | |
80c78696 MD |
153 | #define STACK_CHECKING |
154 | #undef NO_CEVAL_STACK_CHECKING | |
0f2d19dd | 155 | |
43ff3170 | 156 | \f |
3a9809df | 157 | |
1174045c MV |
158 | /* SCM_API is a macro prepended to all function and data definitions |
159 | which should be exported or imported in the resulting dynamic link | |
8f99e3f3 | 160 | library (DLL) in the Win32 port. */ |
1174045c | 161 | |
8f99e3f3 | 162 | #if defined (SCM_IMPORT) |
1174045c | 163 | # define SCM_API __declspec (dllimport) extern |
8f99e3f3 | 164 | #elif defined (SCM_EXPORT) || defined (DLL_EXPORT) |
1174045c MV |
165 | # define SCM_API __declspec (dllexport) extern |
166 | #else | |
167 | # define SCM_API extern | |
168 | #endif | |
169 | ||
170 | \f | |
171 | ||
3a9809df DH |
172 | /* {Debugging Options} |
173 | * | |
174 | * These compile time options determine whether to include code that is only | |
175 | * useful for debugging guile itself or C level extensions to guile. The | |
176 | * common prefix for all option macros of this kind is "SCM_DEBUG_". It is | |
fce0b22d DH |
177 | * guaranteed that a macro named SCM_DEBUG_XXX is always defined (typically to |
178 | * either 0 or 1), i. e. there is no need to test for the undefined case. | |
179 | * This allows to use these definitions comfortably within code, as in the | |
180 | * following example: | |
3a9809df DH |
181 | * #define FOO do { if (SCM_DEBUG_XXX) bar(); else baz(); } while (0) |
182 | * Any sane compiler will remove the unused branch without any performance | |
183 | * penalty for the resulting code. | |
184 | * | |
185 | * Note: Some SCM_DEBUG_XXX options are not settable at configure time. | |
186 | * To change the value of such options you will have to edit this header | |
56100716 DH |
187 | * file or give suitable options to make, like: |
188 | * make all CFLAGS="-DSCM_DEBUG_XXX=1 ..." | |
3a9809df DH |
189 | */ |
190 | ||
191 | ||
c8a54c4b DH |
192 | /* The value of SCM_DEBUG determines the default for most of the not yet |
193 | * defined debugging options. This allows, for example, to enable most of the | |
194 | * debugging options by simply defining SCM_DEBUG as 1. | |
195 | */ | |
196 | #ifndef SCM_DEBUG | |
197 | #define SCM_DEBUG 0 | |
198 | #endif | |
199 | ||
46d53380 DH |
200 | /* If SCM_DEBUG_CELL_ACCESSES is set to 1, cell accesses will perform |
201 | * exhaustive parameter checking: It will be verified that cell parameters | |
202 | * actually point to a valid heap cell. Note: If this option is enabled, | |
203 | * guile will run about ten times slower than normally. | |
204 | */ | |
205 | #ifndef SCM_DEBUG_CELL_ACCESSES | |
206 | #define SCM_DEBUG_CELL_ACCESSES SCM_DEBUG | |
207 | #endif | |
208 | ||
216eedfc DH |
209 | /* If SCM_DEBUG_INTERRUPTS is set to 1, with every deferring and allowing of |
210 | * interrupts a consistency check will be performed. | |
211 | */ | |
212 | #ifndef SCM_DEBUG_INTERRUPTS | |
213 | #define SCM_DEBUG_INTERRUPTS SCM_DEBUG | |
214 | #endif | |
215 | ||
e81d98ec DH |
216 | /* If SCM_DEBUG_PAIR_ACCESSES is set to 1, accesses to cons cells will be |
217 | * exhaustively checked. Note: If this option is enabled, guile will run | |
218 | * slower than normally. | |
219 | */ | |
220 | #ifndef SCM_DEBUG_PAIR_ACCESSES | |
221 | #define SCM_DEBUG_PAIR_ACCESSES SCM_DEBUG | |
222 | #endif | |
223 | ||
af45e3b0 DH |
224 | /* If SCM_DEBUG_REST_ARGUMENT is set to 1, functions that take rest arguments |
225 | * will check whether the rest arguments are actually passed as a proper list. | |
226 | * Otherwise, if SCM_DEBUG_REST_ARGUMENT is 0, functions that take rest | |
227 | * arguments will take it for granted that these are passed as a proper list. | |
c8a54c4b | 228 | */ |
af45e3b0 DH |
229 | #ifndef SCM_DEBUG_REST_ARGUMENT |
230 | #define SCM_DEBUG_REST_ARGUMENT SCM_DEBUG | |
3a9809df DH |
231 | #endif |
232 | ||
fce0b22d DH |
233 | /* The macro SCM_DEBUG_TYPING_STRICTNESS indicates what level of type checking |
234 | * shall be performed with respect to the use of the SCM datatype. The macro | |
235 | * may be defined to one of the values 0, 1 and 2. | |
236 | * | |
237 | * A value of 0 means that there will be no compile time type checking, since | |
238 | * the SCM datatype will be declared as an integral type. This setting should | |
239 | * only be used on systems, where casting from integral types to pointers may | |
240 | * lead to loss of bit information. | |
241 | * | |
242 | * A value of 1 means that there will an intermediate level of compile time | |
243 | * type checking, since the SCM datatype will be declared as a pointer to an | |
244 | * undefined struct. This setting is the default, since it does not cost | |
245 | * anything in terms of performance or code size. | |
246 | * | |
247 | * A value of 2 provides a maximum level of compile time type checking since | |
248 | * the SCM datatype will be declared as a struct. This setting should be used | |
249 | * for _compile time_ type checking only, since the compiled result is likely | |
250 | * to be quite inefficient. The right way to make use of this option is to do | |
251 | * a 'make clean; make CFLAGS=-DSCM_DEBUG_TYPING_STRICTNESS=2', fix your | |
56100716 | 252 | * errors, and then do 'make clean; make'. |
c8a54c4b | 253 | */ |
56100716 | 254 | #ifndef SCM_DEBUG_TYPING_STRICTNESS |
729dbac3 | 255 | #define SCM_DEBUG_TYPING_STRICTNESS 1 |
56100716 DH |
256 | #endif |
257 | ||
d0624e39 DH |
258 | /* If SCM_DEBUG_DEBUGGING_SUPPORT is set to 1, guile will provide a set of |
259 | * special functions that support debugging with a debugger like gdb or | |
260 | * debugging of guile internals on the scheme level. The behaviour of guile | |
261 | * is not changed by this macro, only the set of functions that are available | |
262 | * will differ. All functions that are introduced this way have the prefix | |
263 | * 'scm_dbg_' on the C level and the prefix 'dbg-' on the scheme level. This | |
264 | * allows to easily determine the set of support functions, given that your | |
265 | * debugger or repl provide automatic name completion. Note that these | |
266 | * functions are intended to be used during interactive debugging sessions | |
267 | * only. They are not considered part of guile's official API. They may | |
268 | * change or disappear without notice or deprecation phase. | |
94fb5a6e | 269 | */ |
d0624e39 DH |
270 | #ifndef SCM_DEBUG_DEBUGGING_SUPPORT |
271 | #define SCM_DEBUG_DEBUGGING_SUPPORT SCM_DEBUG | |
94fb5a6e DH |
272 | #endif |
273 | ||
3a9809df DH |
274 | \f |
275 | ||
8c494e99 DH |
276 | /* {Feature Options} |
277 | * | |
278 | * These compile time options determine whether code for certain features | |
279 | * should be compiled into guile. The common prefix for all option macros | |
280 | * of this kind is "SCM_ENABLE_". It is guaranteed that a macro named | |
281 | * SCM_ENABLE_XXX is defined to be either 0 or 1, i. e. there is no need to | |
282 | * test for the undefined case. This allows to use these definitions | |
283 | * comfortably within code, as in the following example: | |
284 | * #define FOO do { if (SCM_ENABLE_XXX) bar(); else baz(); } while (0) | |
285 | * Any sane compiler will remove the unused branch without any performance | |
286 | * penalty for the resulting code. | |
287 | * | |
288 | * Note: Some SCM_ENABLE_XXX options are not settable at configure time. | |
289 | * To change the value of such options you will have to edit this header | |
290 | * file or give suitable options to make, like: | |
291 | * make all CFLAGS="-DSCM_ENABLE_XXX=1 ..." | |
0f2d19dd | 292 | */ |
1be6b49c | 293 | |
8c494e99 DH |
294 | /* If SCM_ENABLE_DEPRECATED is set to 1, deprecated code will be included in |
295 | * guile, as well as some functions to issue run-time warnings about uses of | |
296 | * deprecated functions. | |
297 | */ | |
298 | #ifndef SCM_ENABLE_DEPRECATED | |
299 | #define SCM_ENABLE_DEPRECATED 0 | |
1be6b49c | 300 | #endif |
0f2d19dd | 301 | |
b971d089 | 302 | \f |
0f2d19dd | 303 | |
5c75b29f | 304 | /* {Architecture and compiler properties} |
0f2d19dd | 305 | * |
5c75b29f DH |
306 | * Guile as of today can only work on systems which fulfill at least the |
307 | * following requirements: | |
59c4bb82 DH |
308 | * |
309 | * - scm_t_bits and SCM variables have at least 32 bits. | |
5c75b29f | 310 | * Guile's type system is based on this assumption. |
59c4bb82 DH |
311 | * |
312 | * - sizeof (scm_t_bits) >= sizeof (void*) and sizeof (SCM) >= sizeof (void*) | |
313 | * Guile's type system is based on this assumption, since it must be | |
314 | * possible to store pointers to cells on the heap in scm_t_bits and SCM | |
315 | * variables. | |
316 | * | |
317 | * - sizeof (scm_t_bits) >= 4 and sizeof (scm_t_bits) is a power of 2. | |
318 | * Guile's type system is based on this assumption. In particular, it is | |
319 | * assumed that cells, i. e. pairs of scm_t_bits variables, are eight | |
320 | * character aligned. This is because three bits of a scm_t_bits variable | |
321 | * that is holding a pointer to a cell on the heap must be available for | |
322 | * storing type data. | |
323 | * | |
324 | * - sizeof (scm_t_bits) <= sizeof (void*) and sizeof (SCM) <= sizeof (void*) | |
325 | * In some parts of guile, scm_t_bits and SCM variables are passed to | |
326 | * functions as void* arguments. Together with the requirement above, this | |
327 | * requires a one-to-one correspondence between the size of a void* and the | |
328 | * sizes of scm_t_bits and SCM variables. | |
329 | * | |
5c75b29f DH |
330 | * - numbers are encoded using two's complement. |
331 | * The implementation of the bitwise scheme level operations is based on | |
332 | * this assumption. | |
59c4bb82 | 333 | * |
5c75b29f | 334 | * - ... add more |
0f2d19dd JB |
335 | */ |
336 | ||
5c75b29f DH |
337 | #ifdef CHAR_BIT |
338 | # define SCM_CHAR_BIT CHAR_BIT | |
339 | #else | |
340 | # define SCM_CHAR_BIT 8 | |
341 | #endif | |
342 | ||
343 | #ifdef LONG_BIT | |
344 | # define SCM_LONG_BIT LONG_BIT | |
345 | #else | |
346 | # define SCM_LONG_BIT (SCM_CHAR_BIT * sizeof (long) / sizeof (char)) | |
347 | #endif | |
348 | ||
349 | #ifdef UCHAR_MAX | |
350 | # define SCM_CHAR_CODE_LIMIT (UCHAR_MAX + 1L) | |
0f2d19dd | 351 | #else |
e2806c10 | 352 | # define SCM_CHAR_CODE_LIMIT 256L |
5c75b29f DH |
353 | #endif |
354 | ||
e88d45aa MV |
355 | #define SCM_I_UTYPE_MAX(type) ((type)-1) |
356 | #define SCM_I_TYPE_MAX(type,umax) ((type)((umax)/2)) | |
357 | #define SCM_I_TYPE_MIN(type,umax) (-((type)((umax)/2))-1) | |
358 | ||
359 | #define SCM_T_UINT8_MAX SCM_I_UTYPE_MAX(scm_t_uint8) | |
360 | #define SCM_T_INT8_MIN SCM_I_TYPE_MIN(scm_t_int8,SCM_T_UINT8_MAX) | |
361 | #define SCM_T_INT8_MAX SCM_I_TYPE_MAX(scm_t_int8,SCM_T_UINT8_MAX) | |
362 | ||
363 | #define SCM_T_UINT16_MAX SCM_I_UTYPE_MAX(scm_t_uint16) | |
364 | #define SCM_T_INT16_MIN SCM_I_TYPE_MIN(scm_t_int16,SCM_T_UINT16_MAX) | |
365 | #define SCM_T_INT16_MAX SCM_I_TYPE_MAX(scm_t_int16,SCM_T_UINT16_MAX) | |
366 | ||
367 | #define SCM_T_UINT32_MAX SCM_I_UTYPE_MAX(scm_t_uint32) | |
368 | #define SCM_T_INT32_MIN SCM_I_TYPE_MIN(scm_t_int32,SCM_T_UINT32_MAX) | |
369 | #define SCM_T_INT32_MAX SCM_I_TYPE_MAX(scm_t_int32,SCM_T_UINT32_MAX) | |
370 | ||
371 | #if SCM_HAVE_T_INT64 | |
372 | #define SCM_T_UINT64_MAX SCM_I_UTYPE_MAX(scm_t_uint64) | |
373 | #define SCM_T_INT64_MIN SCM_I_TYPE_MIN(scm_t_int64,SCM_T_UINT64_MAX) | |
374 | #define SCM_T_INT64_MAX SCM_I_TYPE_MAX(scm_t_int64,SCM_T_UINT64_MAX) | |
375 | #endif | |
376 | ||
377 | #if SCM_SIZEOF_LONG_LONG | |
378 | #define SCM_I_ULLONG_MAX SCM_I_UTYPE_MAX(unsigned long long) | |
379 | #define SCM_I_LLONG_MIN SCM_I_TYPE_MIN(long long,SCM_I_ULLONG_MAX) | |
380 | #define SCM_I_LLONG_MAX SCM_I_TYPE_MAX(long long,SCM_I_ULLONG_MAX) | |
381 | #endif | |
382 | ||
383 | #define SCM_T_UINTMAX_MAX SCM_I_UTYPE_MAX(scm_t_uintmax) | |
384 | #define SCM_T_INTMAX_MIN SCM_I_TYPE_MIN(scm_t_intmax,SCM_T_UINTMAX_MAX) | |
385 | #define SCM_T_INTMAX_MAX SCM_I_TYPE_MAX(scm_t_intmax,SCM_T_UINTMAX_MAX) | |
386 | ||
387 | #define SCM_I_SIZE_MAX SCM_I_UTYPE_MAX(size_t) | |
388 | #define SCM_I_SSIZE_MIN SCM_I_TYPE_MIN(ssize_t,SCM_I_SIZE_MAX) | |
389 | #define SCM_I_SSIZE_MAX SCM_I_TYPE_MAX(ssize_t,SCM_I_SIZE_MAX) | |
390 | ||
0f2d19dd JB |
391 | \f |
392 | ||
2a1d8241 | 393 | #include "libguile/tags.h" |
0f2d19dd JB |
394 | |
395 | \f | |
396 | #ifdef vms | |
397 | # ifndef CHEAP_CONTINUATIONS | |
398 | typedef int jmp_buf[17]; | |
399 | extern int setjump(jmp_buf env); | |
400 | extern int longjump(jmp_buf env, int ret); | |
401 | # define setjmp setjump | |
402 | # define longjmp longjump | |
403 | # else | |
404 | # include <setjmp.h> | |
405 | # endif | |
406 | #else /* ndef vms */ | |
407 | # ifdef _CRAY1 | |
408 | typedef int jmp_buf[112]; | |
409 | extern int setjump(jmp_buf env); | |
410 | extern int longjump(jmp_buf env, int ret); | |
411 | # define setjmp setjump | |
412 | # define longjmp longjump | |
413 | # else /* ndef _CRAY1 */ | |
346e4402 NJ |
414 | # if defined (__ia64__) |
415 | /* For IA64, emulate the setjmp API using getcontext. */ | |
416 | # include <signal.h> | |
417 | # include <ucontext.h> | |
418 | typedef struct { | |
419 | ucontext_t ctx; | |
420 | int fresh; | |
421 | } jmp_buf; | |
422 | # define setjmp(JB) \ | |
423 | ( (JB).fresh = 1, \ | |
424 | getcontext (&((JB).ctx)), \ | |
425 | ((JB).fresh ? ((JB).fresh = 0, 0) : 1) ) | |
426 | # define longjmp(JB,VAL) scm_ia64_longjmp (&(JB), VAL) | |
427 | void scm_ia64_longjmp (jmp_buf *, int); | |
428 | # else /* ndef __ia64__ */ | |
429 | # include <setjmp.h> | |
430 | # endif /* ndef __ia64__ */ | |
0f2d19dd JB |
431 | # endif /* ndef _CRAY1 */ |
432 | #endif /* ndef vms */ | |
433 | ||
0f2d19dd JB |
434 | /* James Clark came up with this neat one instruction fix for |
435 | * continuations on the SPARC. It flushes the register windows so | |
3dd84ef1 | 436 | * that all the state of the process is contained in the stack. |
0f2d19dd JB |
437 | */ |
438 | ||
7c12f0ac | 439 | #if defined (sparc) || defined (__sparc__) || defined (__sparc) |
0f2d19dd JB |
440 | # define SCM_FLUSH_REGISTER_WINDOWS asm("ta 3") |
441 | #else | |
442 | # define SCM_FLUSH_REGISTER_WINDOWS /* empty */ | |
443 | #endif | |
444 | ||
3dd84ef1 | 445 | /* If stack is not longword aligned then |
0f2d19dd JB |
446 | */ |
447 | ||
448 | /* #define SHORT_ALIGN */ | |
449 | #ifdef THINK_C | |
450 | # define SHORT_ALIGN | |
451 | #endif | |
452 | #ifdef MSDOS | |
453 | # define SHORT_ALIGN | |
454 | #endif | |
455 | #ifdef atarist | |
456 | # define SHORT_ALIGN | |
457 | #endif | |
458 | ||
459 | #ifdef SHORT_ALIGN | |
460 | typedef short SCM_STACKITEM; | |
461 | #else | |
462 | typedef long SCM_STACKITEM; | |
463 | #endif | |
79f55b7c MD |
464 | |
465 | /* Cast pointer through (void *) in order to avoid compiler warnings | |
466 | when strict aliasing is enabled */ | |
467 | #define SCM_STACK_PTR(ptr) ((SCM_STACKITEM *) (void *) (ptr)) | |
0f2d19dd JB |
468 | \f |
469 | ||
9f0e55a6 MD |
470 | #define SCM_ASYNC_TICK /*fixme* should change names */ \ |
471 | do { \ | |
9de87eea | 472 | if (SCM_I_CURRENT_THREAD->pending_asyncs) \ |
9f0e55a6 MD |
473 | scm_async_click (); \ |
474 | } while (0) | |
25d3ee9d | 475 | |
0f2d19dd | 476 | |
8417b665 JB |
477 | /* Anthony Green writes: |
478 | When the compiler sees... | |
479 | DEFER_INTS; | |
480 | [critical code here] | |
481 | ALLOW_INTS; | |
482 | ...it doesn't actually promise to keep the critical code within the | |
483 | boundries of the DEFER/ALLOW_INTS instructions. It may very well | |
484 | schedule it outside of the magic defined in those macros. | |
485 | ||
486 | However, GCC's volatile asm feature forms a barrier over which code is | |
487 | never moved. So if you add... | |
35eec738 JB |
488 | asm (""); |
489 | ...to each of the DEFER_INTS and ALLOW_INTS macros, the critical | |
490 | code will always remain in place. asm's without inputs or outputs | |
491 | are implicitly volatile. */ | |
8417b665 | 492 | #ifdef __GNUC__ |
35eec738 | 493 | #define SCM_FENCE asm /* volatile */ ("") |
189b66ba MV |
494 | #elif defined (__INTEL_COMPILER) && defined (__ia64) |
495 | #define SCM_FENCE __memory_barrier() | |
8417b665 JB |
496 | #else |
497 | #define SCM_FENCE | |
498 | #endif | |
499 | ||
c72cc5fb | 500 | #define SCM_TICK \ |
bfc69694 | 501 | do { \ |
cd911565 | 502 | SCM_ASYNC_TICK; \ |
216eedfc | 503 | SCM_THREAD_SWITCHING_CODE; \ |
bfc69694 | 504 | } while (0) |
0f2d19dd JB |
505 | |
506 | \f | |
507 | ||
508 | /** SCM_ASSERT | |
3dd84ef1 | 509 | ** |
0f2d19dd JB |
510 | **/ |
511 | ||
512 | ||
513 | #ifdef SCM_RECKLESS | |
514 | #define SCM_ASSERT(_cond, _arg, _pos, _subr) | |
23deee81 | 515 | #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr, _msg) |
0f2d19dd JB |
516 | #define SCM_ASRTGO(_cond, _label) |
517 | #else | |
9cc37597 LC |
518 | #define SCM_ASSERT(_cond, _arg, _pos, _subr) \ |
519 | do { if (SCM_UNLIKELY (!(_cond))) \ | |
aeb4c2e1 | 520 | scm_wrong_type_arg (_subr, _pos, _arg); } while (0) |
9cc37597 LC |
521 | #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr, _msg) \ |
522 | do { if (SCM_UNLIKELY (!(_cond))) \ | |
aeb4c2e1 | 523 | scm_wrong_type_arg_msg(_subr, _pos, _arg, _msg); } while (0) |
9cc37597 LC |
524 | #define SCM_ASRTGO(_cond, _label) \ |
525 | do { if (SCM_UNLIKELY (!(_cond))) \ | |
aeb4c2e1 | 526 | goto _label; } while (0) |
0f2d19dd | 527 | #endif |
95b88819 | 528 | |
9de33deb MD |
529 | /* |
530 | * SCM_WTA_DISPATCH | |
531 | */ | |
532 | ||
451e591c DH |
533 | /* Dirk:FIXME:: In all of the SCM_WTA_DISPATCH_* macros it is assumed that |
534 | * 'gf' is zero if uninitialized. It would be cleaner if some valid SCM value | |
535 | * like SCM_BOOL_F or SCM_UNDEFINED was chosen. | |
536 | */ | |
537 | ||
1174045c | 538 | SCM_API SCM scm_call_generic_0 (SCM gf); |
b3c8a0f5 | 539 | |
e68fc829 | 540 | #define SCM_WTA_DISPATCH_0(gf, subr) \ |
c07b3fef MD |
541 | return (SCM_UNPACK (gf) \ |
542 | ? scm_call_generic_0 ((gf)) \ | |
e68fc829 | 543 | : (scm_error_num_args_subr ((subr)), SCM_UNSPECIFIED)) |
9cc37597 LC |
544 | #define SCM_GASSERT0(cond, gf, subr) \ |
545 | if (SCM_UNLIKELY(!(cond))) \ | |
546 | SCM_WTA_DISPATCH_0((gf), (subr)) | |
b3c8a0f5 | 547 | |
1174045c | 548 | SCM_API SCM scm_call_generic_1 (SCM gf, SCM a1); |
9de33deb | 549 | |
c07b3fef MD |
550 | #define SCM_WTA_DISPATCH_1(gf, a1, pos, subr) \ |
551 | return (SCM_UNPACK (gf) \ | |
552 | ? scm_call_generic_1 ((gf), (a1)) \ | |
553 | : (scm_wrong_type_arg ((subr), (pos), (a1)), SCM_UNSPECIFIED)) | |
9cc37597 LC |
554 | #define SCM_GASSERT1(cond, gf, a1, pos, subr) \ |
555 | if (SCM_UNLIKELY (!(cond))) \ | |
556 | SCM_WTA_DISPATCH_1((gf), (a1), (pos), (subr)) | |
9de33deb | 557 | |
1174045c | 558 | SCM_API SCM scm_call_generic_2 (SCM gf, SCM a1, SCM a2); |
9de33deb | 559 | |
c07b3fef MD |
560 | #define SCM_WTA_DISPATCH_2(gf, a1, a2, pos, subr) \ |
561 | return (SCM_UNPACK (gf) \ | |
562 | ? scm_call_generic_2 ((gf), (a1), (a2)) \ | |
563 | : (scm_wrong_type_arg ((subr), (pos), \ | |
564 | (pos) == SCM_ARG1 ? (a1) : (a2)), \ | |
565 | SCM_UNSPECIFIED)) | |
9cc37597 LC |
566 | #define SCM_GASSERT2(cond, gf, a1, a2, pos, subr) \ |
567 | if (SCM_UNLIKELY (!(cond))) \ | |
568 | SCM_WTA_DISPATCH_2((gf), (a1), (a2), (pos), (subr)) | |
9de33deb | 569 | |
1174045c | 570 | SCM_API SCM scm_apply_generic (SCM gf, SCM args); |
89c358b1 | 571 | |
c07b3fef MD |
572 | #define SCM_WTA_DISPATCH_n(gf, args, pos, subr) \ |
573 | return (SCM_UNPACK (gf) \ | |
574 | ? scm_apply_generic ((gf), (args)) \ | |
575 | : (scm_wrong_type_arg ((subr), (pos), \ | |
576 | scm_list_ref ((args), \ | |
93ccaef0 | 577 | scm_from_int ((pos) - 1))), \ |
c07b3fef | 578 | SCM_UNSPECIFIED)) |
9cc37597 LC |
579 | #define SCM_GASSERTn(cond, gf, args, pos, subr) \ |
580 | if (SCM_UNLIKELY (!(cond))) \ | |
581 | SCM_WTA_DISPATCH_n((gf), (args), (pos), (subr)) | |
89c358b1 | 582 | |
c751e5e3 GB |
583 | #ifndef SCM_MAGIC_SNARFER |
584 | /* Let these macros pass through if | |
585 | we are snarfing; thus we can tell the | |
586 | difference between the use of an actual | |
587 | number vs. the use of one of these macros -- | |
f5421cfc | 588 | actual numbers in SCM_VALIDATE_* and SCM_ASSERT |
c751e5e3 GB |
589 | constructs must match the formal argument name, |
590 | but using SCM_ARG* avoids the test */ | |
591 | ||
0f2d19dd JB |
592 | #define SCM_ARGn 0 |
593 | #define SCM_ARG1 1 | |
594 | #define SCM_ARG2 2 | |
595 | #define SCM_ARG3 3 | |
596 | #define SCM_ARG4 4 | |
597 | #define SCM_ARG5 5 | |
1146b6cd | 598 | #define SCM_ARG6 6 |
3dd84ef1 | 599 | #define SCM_ARG7 7 |
0f2d19dd | 600 | |
c751e5e3 | 601 | #endif /* SCM_MAGIC_SNARFER */ |
0f2d19dd | 602 | |
0f2d19dd JB |
603 | \f |
604 | ||
605 | /* SCM_EXIT_SUCCESS is the default code to return from SCM if no errors | |
606 | * were encountered. SCM_EXIT_FAILURE is the default code to return from | |
607 | * SCM if errors were encountered. The return code can be explicitly | |
608 | * specified in a SCM program with (scm_quit <n>). | |
609 | */ | |
610 | ||
611 | #ifndef SCM_EXIT_SUCCESS | |
612 | #ifdef vms | |
613 | #define SCM_EXIT_SUCCESS 1 | |
614 | #else | |
615 | #define SCM_EXIT_SUCCESS 0 | |
616 | #endif /* def vms */ | |
617 | #endif /* ndef SCM_EXIT_SUCCESS */ | |
618 | #ifndef SCM_EXIT_FAILURE | |
619 | #ifdef vms | |
620 | #define SCM_EXIT_FAILURE 2 | |
621 | #else | |
622 | #define SCM_EXIT_FAILURE 1 | |
623 | #endif /* def vms */ | |
624 | #endif /* ndef SCM_EXIT_FAILURE */ | |
625 | ||
570b6821 MV |
626 | /* Define SCM_C_INLINE_KEYWORD so that it can be used as a replacement |
627 | for the "inline" keyword, expanding to nothing when "inline" is not | |
628 | available. | |
629 | */ | |
630 | ||
631 | #ifdef SCM_C_INLINE | |
632 | #define SCM_C_INLINE_KEYWORD SCM_C_INLINE | |
633 | #else | |
634 | #define SCM_C_INLINE_KEYWORD | |
635 | #endif | |
636 | ||
729dbac3 | 637 | #endif /* SCM___SCM_H */ |
89e00824 ML |
638 | |
639 | /* | |
640 | Local Variables: | |
641 | c-file-style: "gnu" | |
642 | End: | |
643 | */ |