5 /* Copyright (C) 1995, 1996, 1998 Free Software Foundation, Inc.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this software; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20 * Boston, MA 02111-1307 USA
22 * As a special exception, the Free Software Foundation gives permission
23 * for additional uses of the text contained in its release of GUILE.
25 * The exception is that, if you link the GUILE library with other files
26 * to produce an executable, this does not by itself cause the
27 * resulting executable to be covered by the GNU General Public License.
28 * Your use of that executable is in no way restricted on account of
29 * linking the GUILE library code into it.
31 * This exception does not however invalidate any other reasons why
32 * the executable file might be covered by the GNU General Public License.
34 * This exception applies only to the code released by the
35 * Free Software Foundation under the name GUILE. If you copy
36 * code from other Free Software Foundation releases into a copy of
37 * GUILE, as the General Public License permits, the exception does
38 * not apply to the code that you add in this way. To avoid misleading
39 * anyone as to the status of such modified files, you must delete
40 * this exception notice from them.
42 * If you write modifications of your own for GUILE, it is your choice
43 * whether to permit this exception to apply to your modifications.
44 * If you do not wish that, delete this exception notice. */
46 /* {Supported Options}
48 * These may be defined or undefined.
51 /* If the compile FLAG `SCM_CAUTIOUS' is #defined then the number of
52 * arguments is always checked for application of closures. If the
53 * compile FLAG `SCM_RECKLESS' is #defined then they are not checked.
54 * Otherwise, number of argument checks for closures are made only when
55 * the function position (whose value is the closure) of a combination is
56 * not an ILOC or GLOC. When the function position of a combination is a
57 * symbol it will be checked only the first time it is evaluated because
58 * it will then be replaced with an ILOC or GLOC.
63 /* After looking up a local for the first time, rewrite the
64 * code graph, caching its position.
66 #define MEMOIZE_LOCALS
68 /* All the number support there is.
73 /* GC should relinquish empty cons-pair arenas.
75 #define GC_FREE_SEGMENTS
77 /* Provide a scheme-accessible count-down timer that
78 * generates a pseudo-interrupt.
83 /* Use engineering notation when converting numbers strings?
87 /* Include support for uniform arrays?
89 * Possibly some of the initialization code depends on this
90 * being defined, but that is a bug and should be fixed.
94 #undef SCM_CAREFUL_INTS
96 /* {Unsupported Options}
98 * These must be defined as given here.
104 /* Guile Scheme supports the #f/() distinction; Guile Lisp won't. We
105 have horrible plans for their unification. */
110 /* Random options (not yet supported or in final form). */
112 #define STACK_CHECKING
113 #undef NO_CEVAL_STACK_CHECKING
116 /* Some auto-generated .h files contain unused prototypes
117 * that need these typedefs.
119 typedef long long_long
;
120 typedef unsigned long ulong_long
;
124 /* What did the configure script discover about the outside world? */
125 #include "libguile/scmconfig.h"
128 /* Write prototype declarations like this:
129 int foo SCM_P ((int a, int b));
130 At definitions, use K&R style declarations, but make sure there's a
131 declarative prototype (as above) in scope. This will give you
132 argument type checking, when available, and be harmless otherwise. */
143 * SCM_CHAR_CODE_LIMIT == UCHAR_MAX + 1
144 * SCM_MOST_POSITIVE_FIXNUM (LONG_MAX>>2)
145 * SCM_MOST_NEGATIVE_FIXNUM == SCM_SRS((long)LONG_MIN, 2)
151 # define SCM_CHAR_CODE_LIMIT (UCHAR_MAX+1L)
153 # define SCM_CHAR_CODE_LIMIT 256L
154 # endif /* def UCHAR_MAX */
155 # define SCM_MOST_POSITIVE_FIXNUM (LONG_MAX>>2)
156 # ifdef _UNICOS /* Stupid cray bug */
157 # define SCM_MOST_NEGATIVE_FIXNUM ((long)LONG_MIN/4)
159 # define SCM_MOST_NEGATIVE_FIXNUM SCM_SRS((long)LONG_MIN, 2)
162 # define SCM_CHAR_CODE_LIMIT 256L
163 # define SCM_MOST_POSITIVE_FIXNUM ((long)((unsigned long)~0L>>3))
165 # define SCM_MOST_NEGATIVE_FIXNUM (-SCM_MOST_POSITIVE_FIXNUM-1)
167 # define SCM_MOST_NEGATIVE_FIXNUM (-SCM_MOST_POSITIVE_FIXNUM)
168 # endif /* (0 != ~0) */
169 #endif /* def HAVE_LIMITS_H */
176 # endif /* def AMIGA */
177 # define scm_sizet size_t
180 # define scm_sizet size_t
182 # define scm_sizet unsigned int
183 # endif /* def _SIZE_T */
184 #endif /* def STDC_HEADERS */
188 #include "libguile/tags.h"
192 # ifndef CHEAP_CONTINUATIONS
193 typedef int jmp_buf[17];
194 extern int setjump(jmp_buf env
);
195 extern int longjump(jmp_buf env
, int ret
);
196 # define setjmp setjump
197 # define longjmp longjump
203 typedef int jmp_buf[112];
204 extern int setjump(jmp_buf env
);
205 extern int longjump(jmp_buf env
, int ret
);
206 # define setjmp setjump
207 # define longjmp longjump
208 # else /* ndef _CRAY1 */
210 # endif /* ndef _CRAY1 */
211 #endif /* ndef vms */
213 /* James Clark came up with this neat one instruction fix for
214 * continuations on the SPARC. It flushes the register windows so
215 * that all the state of the process is contained in the stack.
219 # define SCM_FLUSH_REGISTER_WINDOWS asm("ta 3")
221 # define SCM_FLUSH_REGISTER_WINDOWS /* empty */
224 /* If stack is not longword aligned then
227 /* #define SHORT_ALIGN */
239 typedef short SCM_STACKITEM
;
241 typedef long SCM_STACKITEM
;
246 #define SCM_THREAD_DEFER
247 #define SCM_THREAD_ALLOW
248 #define SCM_THREAD_REDEFER
249 #define SCM_THREAD_REALLOW_1
250 #define SCM_THREAD_REALLOW_2
251 #define SCM_THREAD_SWITCHING_CODE
254 extern unsigned int scm_async_clock
;
256 #define SCM_ASYNC_TICK \
258 if (0 == --scm_async_clock) \
259 scm_async_click (); \
262 #ifdef SCM_CAREFUL_INTS
263 #define SCM_CHECK_NOT_DISABLED \
264 if (scm_ints_disabled) \
265 fputs("ints already disabled\n", stderr); \
267 #define SCM_CHECK_NOT_ENABLED \
268 if (!scm_ints_disabled) \
269 fputs("ints already enabled\n", stderr); \
272 #define SCM_CHECK_NOT_DISABLED
273 #define SCM_CHECK_NOT_ENABLED
277 /* Anthony Green writes:
278 When the compiler sees...
282 ...it doesn't actually promise to keep the critical code within the
283 boundries of the DEFER/ALLOW_INTS instructions. It may very well
284 schedule it outside of the magic defined in those macros.
286 However, GCC's volatile asm feature forms a barrier over which code is
287 never moved. So if you add...
289 ...to each of the DEFER_INTS and ALLOW_INTS macros, the critical code
290 will always remain in place. */
292 #define SCM_FENCE asm volatile ("")
297 #define SCM_DEFER_INTS \
300 SCM_CHECK_NOT_DISABLED; \
303 scm_ints_disabled = 1; \
308 #define SCM_ALLOW_INTS_ONLY \
311 scm_ints_disabled = 0; \
315 #define SCM_ALLOW_INTS \
318 SCM_CHECK_NOT_ENABLED; \
319 SCM_THREAD_SWITCHING_CODE; \
321 scm_ints_disabled = 0; \
329 #define SCM_REDEFER_INTS \
332 SCM_THREAD_REDEFER; \
333 ++scm_ints_disabled; \
338 #define SCM_REALLOW_INTS \
341 SCM_THREAD_REALLOW_1; \
342 SCM_THREAD_SWITCHING_CODE; \
344 --scm_ints_disabled; \
345 if (!scm_ints_disabled) \
347 SCM_THREAD_REALLOW_2; \
362 /* Classification of critical sections
364 * When Guile moves to POSIX threads, it won't be possible to prevent
365 * context switching. In fact, the whole idea of context switching is
366 * bogus if threads are run by different processors. Therefore, we
367 * must ultimately eliminate all critical sections or enforce them by
370 * All instances of SCM_DEFER_INTS and SCM_ALLOW_INTS should therefore
371 * be classified and replaced by one of the delimiters below. If you
372 * understand what this is all about, I'd like to encourage you to
373 * help with this task. The set of classes below must of course be
374 * incrementally augmented.
376 * MDJ 980419 <djurfeldt@nada.kth.se>
381 * Allocation of a cell with type tag in the CAR.
383 * With POSIX threads, each thread will have a private pool of free
384 * cells. Therefore, this type of section can be removed. But! It
385 * is important that the CDR is initialized first (with the CAR still
386 * indicating a free cell) so that we can guarantee a consistent heap
390 #ifdef SCM_POSIX_THREADS
391 #define SCM_ENTER_A_SECTION
392 #define SCM_EXIT_A_SECTION
394 #define SCM_ENTER_A_SECTION SCM_DEFER_INTS
395 #define SCM_EXIT_A_SECTION SCM_ALLOW_INTS
406 #define SCM_ASSERT(_cond, _arg, _pos, _subr)
407 #define SCM_ASRTGO(_cond, _label)
409 #define SCM_ASSERT(_cond, _arg, _pos, _subr) \
411 scm_wta(_arg, (char *)(_pos), _subr)
412 #define SCM_ASRTGO(_cond, _label) \
425 /* #define SCM_ARGERR(X) ((X) < SCM_WNA \
427 : "wrong type argument")
430 /* Following must match entry indexes in scm_errmsgs[].
431 * Also, SCM_WNA must follow the last SCM_ARGn in sequence.
434 /* #define SCM_OVSCM_FLOW 9 */
435 #define SCM_OUTOFRANGE 10
436 #define SCM_NALLOC 11
437 /* #define SCM_STACK_OVFLOW 12 */
438 /* #define SCM_EXIT 13 */
441 /* (...still matching scm_errmsgs) These
442 * are signals. Signals may become errors
443 * but are distinguished because they first
444 * try to invoke a handler that can resume
445 * the interrupted routine.
447 #define SCM_HUP_SIGNAL 14
448 #define SCM_INT_SIGNAL 15
449 #define SCM_FPE_SIGNAL 16
450 #define SCM_BUS_SIGNAL 17
451 #define SCM_SEGV_SIGNAL 18
452 #define SCM_ALRM_SIGNAL 19
453 #define SCM_GC_SIGNAL 20
454 #define SCM_TICK_SIGNAL 21
456 #define SCM_SIG_ORD(X) ((X) - SCM_HUP_SIGNAL)
457 #define SCM_ORD_SIG(X) ((X) + SCM_HUP_SIGNAL)
458 #define SCM_NUM_SIGS (SCM_SIG_ORD (SCM_TICK_SIGNAL) + 1)
469 extern struct errdesc scm_errmsgs
[];
474 /* SCM_EXIT_SUCCESS is the default code to return from SCM if no errors
475 * were encountered. SCM_EXIT_FAILURE is the default code to return from
476 * SCM if errors were encountered. The return code can be explicitly
477 * specified in a SCM program with (scm_quit <n>).
480 #ifndef SCM_EXIT_SUCCESS
482 #define SCM_EXIT_SUCCESS 1
484 #define SCM_EXIT_SUCCESS 0
486 #endif /* ndef SCM_EXIT_SUCCESS */
487 #ifndef SCM_EXIT_FAILURE
489 #define SCM_EXIT_FAILURE 2
491 #define SCM_EXIT_FAILURE 1
493 #endif /* ndef SCM_EXIT_FAILURE */