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0f2d19dd JB |
1 | /* Copyright (C) 1995,1996 Free Software Foundation, Inc. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
15 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
16 | * | |
17 | * As a special exception, the Free Software Foundation gives permission | |
18 | * for additional uses of the text contained in its release of GUILE. | |
19 | * | |
20 | * The exception is that, if you link the GUILE library with other files | |
21 | * to produce an executable, this does not by itself cause the | |
22 | * resulting executable to be covered by the GNU General Public License. | |
23 | * Your use of that executable is in no way restricted on account of | |
24 | * linking the GUILE library code into it. | |
25 | * | |
26 | * This exception does not however invalidate any other reasons why | |
27 | * the executable file might be covered by the GNU General Public License. | |
28 | * | |
29 | * This exception applies only to the code released by the | |
30 | * Free Software Foundation under the name GUILE. If you copy | |
31 | * code from other Free Software Foundation releases into a copy of | |
32 | * GUILE, as the General Public License permits, the exception does | |
33 | * not apply to the code that you add in this way. To avoid misleading | |
34 | * anyone as to the status of such modified files, you must delete | |
35 | * this exception notice from them. | |
36 | * | |
37 | * If you write modifications of your own for GUILE, it is your choice | |
38 | * whether to permit this exception to apply to your modifications. | |
39 | * If you do not wish that, delete this exception notice. | |
40 | */ | |
41 | \f | |
42 | ||
43 | #include <stdio.h> | |
44 | #include "_scm.h" | |
20e6290e JB |
45 | #include "genio.h" |
46 | #include "smob.h" | |
47 | #include "alist.h" | |
48 | #include "eval.h" | |
49 | #include "dynwind.h" | |
e82afdb8 | 50 | #include "backtrace.h" |
20e6290e JB |
51 | #ifdef DEBUG_EXTENSIONS |
52 | #include "debug.h" | |
53 | #endif | |
54 | #include "continuations.h" | |
7f759d79 | 55 | #include "stackchk.h" |
0f2d19dd | 56 | |
20e6290e | 57 | #include "throw.h" |
0f2d19dd | 58 | |
32f7b3a1 | 59 | \f |
0f2d19dd JB |
60 | /* {Catch and Throw} |
61 | */ | |
62 | static int scm_tc16_jmpbuffer; | |
63 | ||
0f2d19dd JB |
64 | #define SCM_JMPBUFP(O) (SCM_TYP16(O) == scm_tc16_jmpbuffer) |
65 | #define JBACTIVE(O) (SCM_CAR (O) & (1L << 16L)) | |
898a256f MD |
66 | #define ACTIVATEJB(O) (SCM_SETOR_CAR (O, (1L << 16L))) |
67 | #define DEACTIVATEJB(O) (SCM_SETAND_CAR (O, ~(1L << 16L))) | |
0f2d19dd | 68 | |
e137c6b3 MD |
69 | #ifndef DEBUG_EXTENSIONS |
70 | #define JBJMPBUF(O) ((jmp_buf*)SCM_CDR (O) ) | |
71 | #define SETJBJMPBUF SCM_SETCDR | |
72 | #else | |
08b5b88c | 73 | #define SCM_JBDFRAME(O) ((scm_debug_frame*)SCM_CAR (SCM_CDR (O)) ) |
0f2d19dd | 74 | #define JBJMPBUF(O) ((jmp_buf*)SCM_CDR (SCM_CDR (O)) ) |
898a256f | 75 | #define SCM_SETJBDFRAME(O,X) SCM_SETCAR (SCM_CDR (O), (SCM)(X)) |
0f2d19dd | 76 | #define SETJBJMPBUF(O,X) SCM_SETCDR(SCM_CDR (O), X) |
e137c6b3 | 77 | |
32f7b3a1 JB |
78 | static scm_sizet freejb SCM_P ((SCM jbsmob)); |
79 | ||
faa6b3df | 80 | static scm_sizet |
e137c6b3 MD |
81 | freejb (jbsmob) |
82 | SCM jbsmob; | |
e137c6b3 MD |
83 | { |
84 | scm_must_free ((char *) SCM_CDR (jbsmob)); | |
85 | return sizeof (scm_cell); | |
86 | } | |
0f2d19dd JB |
87 | #endif |
88 | ||
32f7b3a1 | 89 | static int printjb SCM_P ((SCM exp, SCM port, scm_print_state *pstate)); |
0f2d19dd | 90 | static int |
9882ea19 | 91 | printjb (exp, port, pstate) |
0f2d19dd JB |
92 | SCM exp; |
93 | SCM port; | |
9882ea19 | 94 | scm_print_state *pstate; |
0f2d19dd JB |
95 | { |
96 | scm_gen_puts (scm_regular_string, "#<jmpbuffer ", port); | |
11702758 | 97 | scm_gen_puts (scm_regular_string, JBACTIVE(exp) ? "(active) " : "(inactive) ", port); |
0f2d19dd JB |
98 | scm_intprint((SCM) JBJMPBUF(exp), 16, port); |
99 | scm_gen_putc ('>', port); | |
100 | return 1 ; | |
101 | } | |
102 | ||
e137c6b3 MD |
103 | static scm_smobfuns jbsmob = { |
104 | scm_mark0, | |
105 | #ifdef DEBUG_EXTENSIONS | |
106 | freejb, | |
107 | #else | |
108 | scm_free0, | |
109 | #endif | |
110 | printjb, | |
111 | 0 | |
112 | }; | |
0f2d19dd | 113 | |
11702758 | 114 | static SCM make_jmpbuf SCM_P ((void)); |
0f2d19dd | 115 | static SCM |
11702758 | 116 | make_jmpbuf () |
0f2d19dd JB |
117 | { |
118 | SCM answer; | |
119 | SCM_NEWCELL (answer); | |
7f759d79 | 120 | SCM_REDEFER_INTS; |
0f2d19dd | 121 | { |
e137c6b3 MD |
122 | #ifdef DEBUG_EXTENSIONS |
123 | char *mem = scm_must_malloc (sizeof (scm_cell), "jb"); | |
124 | SCM_SETCDR (answer, (SCM) mem); | |
125 | #endif | |
898a256f | 126 | SCM_SETCAR (answer, scm_tc16_jmpbuffer); |
11702758 MD |
127 | SETJBJMPBUF(answer, (jmp_buf *)0); |
128 | DEACTIVATEJB(answer); | |
0f2d19dd | 129 | } |
7f759d79 | 130 | SCM_REALLOW_INTS; |
0f2d19dd JB |
131 | return answer; |
132 | } | |
133 | ||
0f2d19dd JB |
134 | struct jmp_buf_and_retval /* use only on the stack, in scm_catch */ |
135 | { | |
136 | jmp_buf buf; /* must be first */ | |
137 | SCM throw_tag; | |
138 | SCM retval; | |
139 | }; | |
140 | ||
650fa1ab JB |
141 | |
142 | /* scm_internal_catch is the guts of catch. It handles all the | |
143 | mechanics of setting up a catch target, invoking the catch body, | |
144 | and perhaps invoking the handler if the body does a throw. | |
145 | ||
146 | The function is designed to be usable from C code, but is general | |
147 | enough to implement all the semantics Guile Scheme expects from | |
148 | throw. | |
149 | ||
150 | TAG is the catch tag. Typically, this is a symbol, but this | |
151 | function doesn't actually care about that. | |
152 | ||
153 | BODY is a pointer to a C function which runs the body of the catch; | |
154 | this is the code you can throw from. We call it like this: | |
816a6f06 | 155 | BODY (BODY_DATA, JMPBUF) |
650fa1ab | 156 | where: |
816a6f06 JB |
157 | BODY_DATA is just the BODY_DATA argument we received; we pass it |
158 | through to BODY as its first argument. The caller can make | |
159 | BODY_DATA point to anything useful that BODY might need. | |
650fa1ab JB |
160 | JMPBUF is the Scheme jmpbuf object corresponding to this catch, |
161 | which we have just created and initialized. | |
162 | ||
163 | HANDLER is a pointer to a C function to deal with a throw to TAG, | |
164 | should one occur. We call it like this: | |
816a6f06 | 165 | HANDLER (HANDLER_DATA, TAG, THROW_ARGS) |
650fa1ab | 166 | where |
816a6f06 JB |
167 | HANDLER_DATA is the HANDLER_DATA argument we recevied; it's the |
168 | same idea as BODY_DATA above. | |
650fa1ab JB |
169 | TAG is the tag that the user threw to; usually this is TAG, but |
170 | it could be something else if TAG was #t (i.e., a catch-all), | |
171 | or the user threw to a jmpbuf. | |
172 | THROW_ARGS is the list of arguments the user passed to the THROW | |
173 | function. | |
174 | ||
816a6f06 JB |
175 | BODY_DATA is just a pointer we pass through to BODY. |
176 | HANDLER_DATA is just a pointer we pass through to HANDLER. | |
177 | We don't actually use either of those pointers otherwise ourselves. | |
178 | The idea is that, if our caller wants to communicate something to | |
179 | BODY or HANDLER, it can pass a pointer to it as MUMBLE_DATA, which | |
180 | BODY and HANDLER can then use. Think of it as a way to make BODY | |
181 | and HANDLER closures, not just functions; MUMBLE_DATA points to the | |
182 | enclosed variables. */ | |
650fa1ab | 183 | |
0f2d19dd | 184 | SCM |
816a6f06 | 185 | scm_internal_catch (tag, body, body_data, handler, handler_data) |
0f2d19dd | 186 | SCM tag; |
650fa1ab | 187 | scm_catch_body_t body; |
816a6f06 | 188 | void *body_data; |
650fa1ab | 189 | scm_catch_handler_t handler; |
816a6f06 | 190 | void *handler_data; |
0f2d19dd JB |
191 | { |
192 | struct jmp_buf_and_retval jbr; | |
193 | SCM jmpbuf; | |
194 | SCM answer; | |
195 | ||
11702758 | 196 | jmpbuf = make_jmpbuf (); |
0f2d19dd JB |
197 | answer = SCM_EOL; |
198 | scm_dynwinds = scm_acons (tag, jmpbuf, scm_dynwinds); | |
199 | SETJBJMPBUF(jmpbuf, &jbr.buf); | |
200 | #ifdef DEBUG_EXTENSIONS | |
e68b42c1 | 201 | SCM_SETJBDFRAME(jmpbuf, scm_last_debug_frame); |
0f2d19dd JB |
202 | #endif |
203 | if (setjmp (jbr.buf)) | |
204 | { | |
205 | SCM throw_tag; | |
206 | SCM throw_args; | |
207 | ||
7f759d79 MD |
208 | #ifdef STACK_CHECKING |
209 | scm_stack_checking_enabled_p = SCM_STACK_CHECKING_P; | |
210 | #endif | |
211 | SCM_REDEFER_INTS; | |
0f2d19dd JB |
212 | DEACTIVATEJB (jmpbuf); |
213 | scm_dynwinds = SCM_CDR (scm_dynwinds); | |
7f759d79 | 214 | SCM_REALLOW_INTS; |
0f2d19dd JB |
215 | throw_args = jbr.retval; |
216 | throw_tag = jbr.throw_tag; | |
217 | jbr.throw_tag = SCM_EOL; | |
218 | jbr.retval = SCM_EOL; | |
816a6f06 | 219 | answer = handler (handler_data, throw_tag, throw_args); |
0f2d19dd JB |
220 | } |
221 | else | |
222 | { | |
223 | ACTIVATEJB (jmpbuf); | |
816a6f06 | 224 | answer = body (body_data, jmpbuf); |
7f759d79 | 225 | SCM_REDEFER_INTS; |
0f2d19dd JB |
226 | DEACTIVATEJB (jmpbuf); |
227 | scm_dynwinds = SCM_CDR (scm_dynwinds); | |
7f759d79 | 228 | SCM_REALLOW_INTS; |
0f2d19dd JB |
229 | } |
230 | return answer; | |
231 | } | |
232 | ||
650fa1ab | 233 | |
816a6f06 JB |
234 | /* This is a body function you can pass to scm_internal_catch if you |
235 | want the body to be like Scheme's `catch' --- a thunk, or a | |
236 | function of one argument if the tag is #f. | |
650fa1ab | 237 | |
816a6f06 JB |
238 | DATA contains the Scheme procedure to invoke. If the tag being |
239 | caught is #f, then we pass JMPBUF to the body procedure; otherwise, | |
240 | it gets no arguments. */ | |
650fa1ab | 241 | |
816a6f06 JB |
242 | SCM |
243 | scm_body_thunk (body_data, jmpbuf) | |
244 | void *body_data; | |
650fa1ab JB |
245 | SCM jmpbuf; |
246 | { | |
816a6f06 | 247 | struct scm_body_thunk_data *c = (struct scm_body_thunk_data *) body_data; |
650fa1ab JB |
248 | |
249 | if (c->tag == SCM_BOOL_F) | |
250 | return scm_apply (c->body_proc, scm_cons (jmpbuf, SCM_EOL), SCM_EOL); | |
251 | else | |
252 | return scm_apply (c->body_proc, SCM_EOL, SCM_EOL); | |
253 | } | |
254 | ||
255 | ||
816a6f06 JB |
256 | /* If the user does a throw to this catch, this function runs a |
257 | handler procedure written in Scheme. HANDLER_DATA is a pointer to | |
258 | an SCM variable holding the Scheme procedure object to invoke. It | |
259 | ought to be a pointer to an automatic, or the procedure object | |
260 | should be otherwise protected from GC. */ | |
261 | SCM | |
262 | scm_handle_by_proc (handler_data, tag, throw_args) | |
263 | void *handler_data; | |
650fa1ab JB |
264 | SCM tag; |
265 | SCM throw_args; | |
266 | { | |
816a6f06 | 267 | SCM *handler_proc_p = (SCM *) handler_data; |
650fa1ab | 268 | |
816a6f06 | 269 | return scm_apply (*handler_proc_p, scm_cons (tag, throw_args), SCM_EOL); |
650fa1ab JB |
270 | } |
271 | ||
272 | ||
e68b42c1 MD |
273 | SCM_PROC(s_catch, "catch", 3, 0, 0, scm_catch); |
274 | SCM | |
275 | scm_catch (tag, thunk, handler) | |
276 | SCM tag; | |
277 | SCM thunk; | |
278 | SCM handler; | |
279 | { | |
816a6f06 | 280 | struct scm_body_thunk_data c; |
650fa1ab | 281 | |
e68b42c1 MD |
282 | SCM_ASSERT ((tag == SCM_BOOL_F) |
283 | || (SCM_NIMP(tag) && SCM_SYMBOLP(tag)) | |
284 | || (tag == SCM_BOOL_T), | |
285 | tag, SCM_ARG1, s_catch); | |
650fa1ab JB |
286 | |
287 | c.tag = tag; | |
288 | c.body_proc = thunk; | |
650fa1ab JB |
289 | |
290 | /* scm_internal_catch takes care of all the mechanics of setting up | |
816a6f06 JB |
291 | a catch tag; we tell it to call scm_body_thunk to run the body, |
292 | and scm_handle_by_proc to deal with any throws to this catch. | |
293 | The former receives a pointer to c, telling it how to behave. | |
294 | The latter receives a pointer to HANDLER, so it knows who to call. */ | |
295 | return scm_internal_catch (tag, | |
296 | scm_body_thunk, &c, | |
297 | scm_handle_by_proc, &handler); | |
e68b42c1 MD |
298 | } |
299 | ||
300 | SCM_PROC(s_lazy_catch, "lazy-catch", 3, 0, 0, scm_lazy_catch); | |
301 | SCM | |
302 | scm_lazy_catch (tag, thunk, handler) | |
303 | SCM tag; | |
304 | SCM thunk; | |
305 | SCM handler; | |
306 | { | |
97a307b9 | 307 | SCM answer; |
11702758 | 308 | SCM_ASSERT ((SCM_NIMP(tag) && SCM_SYMBOLP(tag)) |
e68b42c1 MD |
309 | || (tag == SCM_BOOL_T), |
310 | tag, SCM_ARG1, s_lazy_catch); | |
97a307b9 | 311 | SCM_REDEFER_INTS; |
11702758 | 312 | scm_dynwinds = scm_acons (tag, handler, scm_dynwinds); |
97a307b9 MD |
313 | SCM_REALLOW_INTS; |
314 | answer = scm_apply (thunk, SCM_EOL, SCM_EOL); | |
315 | SCM_REDEFER_INTS; | |
316 | scm_dynwinds = SCM_CDR (scm_dynwinds); | |
317 | SCM_REALLOW_INTS; | |
318 | return answer; | |
e68b42c1 | 319 | } |
0f2d19dd | 320 | |
816a6f06 JB |
321 | /* The user has thrown to an uncaught key --- print a message and die. |
322 | At boot time, we establish a catch-all that uses this as its handler. | |
32f7b3a1 JB |
323 | 1) If the user wants something different, they can use (catch #t |
324 | ...) to do what they like. | |
325 | 2) Outside the context of a read-eval-print loop, there isn't | |
326 | anything else good to do; libguile should not assume the existence | |
327 | of a read-eval-print loop. | |
328 | 3) Given that we shouldn't do anything complex, it's much more | |
816a6f06 JB |
329 | robust to do it in C code. |
330 | ||
331 | HANDLER_DATA, if non-zero, is assumed to be a char * pointing to a | |
332 | message header to print; if zero, we use "guile" instead. That | |
333 | text is followed by a colon, then the message described by ARGS. */ | |
334 | ||
335 | SCM | |
336 | scm_handle_by_message (handler_data, tag, args) | |
337 | void *handler_data; | |
338 | SCM tag; | |
32f7b3a1 JB |
339 | SCM args; |
340 | { | |
816a6f06 | 341 | char *prog_name = (char *) handler_data; |
e82afdb8 JB |
342 | SCM p = scm_def_errp; |
343 | ||
816a6f06 JB |
344 | if (! prog_name) |
345 | prog_name = "guile"; | |
346 | ||
347 | scm_gen_puts (scm_regular_string, prog_name, p); | |
348 | scm_gen_puts (scm_regular_string, ": ", p); | |
349 | ||
e82afdb8 JB |
350 | if (scm_ilength (args) >= 3) |
351 | { | |
352 | SCM message = SCM_CADR (args); | |
353 | SCM parts = SCM_CADDR (args); | |
354 | ||
e82afdb8 JB |
355 | scm_display_error_message (message, parts, p); |
356 | } | |
357 | else | |
358 | { | |
816a6f06 JB |
359 | scm_gen_puts (scm_regular_string, "uncaught throw to ", p); |
360 | scm_prin1 (tag, p, 0); | |
e82afdb8 JB |
361 | scm_gen_puts (scm_regular_string, ": ", p); |
362 | scm_prin1 (args, p, 1); | |
363 | scm_gen_putc ('\n', p); | |
364 | } | |
365 | ||
32f7b3a1 JB |
366 | exit (2); |
367 | } | |
368 | ||
369 | ||
ad310508 MD |
370 | SCM_PROC(s_throw, "throw", 1, 0, 1, scm_throw); |
371 | SCM | |
372 | scm_throw (key, args) | |
373 | SCM key; | |
374 | SCM args; | |
375 | { | |
376 | /* May return if handled by lazy catch. */ | |
377 | return scm_ithrow (key, args, 1); | |
378 | } | |
379 | ||
380 | ||
0f2d19dd JB |
381 | SCM |
382 | scm_ithrow (key, args, noreturn) | |
383 | SCM key; | |
384 | SCM args; | |
385 | int noreturn; | |
0f2d19dd JB |
386 | { |
387 | SCM jmpbuf; | |
388 | SCM wind_goal; | |
389 | ||
390 | if (SCM_NIMP (key) && SCM_JMPBUFP (key)) | |
391 | { | |
392 | jmpbuf = key; | |
393 | if (noreturn) | |
394 | { | |
395 | SCM_ASSERT (JBACTIVE (jmpbuf), jmpbuf, | |
396 | "throw to dynamically inactive catch", | |
397 | s_throw); | |
398 | } | |
399 | else if (!JBACTIVE (jmpbuf)) | |
400 | return SCM_UNSPECIFIED; | |
401 | } | |
402 | else | |
403 | { | |
4dc2435a | 404 | SCM dynpair = SCM_UNDEFINED; |
32f7b3a1 | 405 | SCM winds; |
0f2d19dd JB |
406 | |
407 | if (noreturn) | |
408 | { | |
32f7b3a1 JB |
409 | SCM_ASSERT (SCM_NIMP (key) && SCM_SYMBOLP (key), key, SCM_ARG1, |
410 | s_throw); | |
0f2d19dd JB |
411 | } |
412 | else if (!(SCM_NIMP (key) && SCM_SYMBOLP (key))) | |
413 | return SCM_UNSPECIFIED; | |
414 | ||
32f7b3a1 JB |
415 | /* Search the wind list for an appropriate catch. |
416 | "Waiter, please bring us the wind list." */ | |
b20b2777 | 417 | for (winds = scm_dynwinds; SCM_NIMP (winds); winds = SCM_CDR (winds)) |
0f2d19dd | 418 | { |
b20b2777 JB |
419 | if (! SCM_CONSP (winds)) |
420 | abort (); | |
421 | ||
32f7b3a1 | 422 | dynpair = SCM_CAR (winds); |
b20b2777 | 423 | if (SCM_NIMP (dynpair) && SCM_CONSP (dynpair)) |
32f7b3a1 JB |
424 | { |
425 | SCM this_key = SCM_CAR (dynpair); | |
426 | ||
427 | if (this_key == SCM_BOOL_T || this_key == key) | |
428 | break; | |
429 | } | |
0f2d19dd | 430 | } |
32f7b3a1 | 431 | |
816a6f06 JB |
432 | /* If we didn't find anything, abort. scm_boot_guile should |
433 | have established a catch-all, but obviously things are | |
434 | thoroughly screwed up. */ | |
b20b2777 | 435 | if (winds == SCM_EOL) |
816a6f06 | 436 | abort (); |
b20b2777 JB |
437 | |
438 | if (SCM_IMP (winds) || SCM_NCONSP (winds)) | |
439 | abort (); | |
0f2d19dd JB |
440 | |
441 | if (dynpair != SCM_BOOL_F) | |
442 | jmpbuf = SCM_CDR (dynpair); | |
443 | else | |
444 | { | |
445 | if (!noreturn) | |
446 | return SCM_UNSPECIFIED; | |
447 | else | |
448 | { | |
449 | scm_exitval = scm_cons (key, args); | |
450 | scm_dowinds (SCM_EOL, scm_ilength (scm_dynwinds)); | |
faa6b3df | 451 | #ifdef DEBUG_EXTENSIONS |
e68b42c1 | 452 | scm_last_debug_frame = SCM_DFRAME (scm_rootcont); |
faa6b3df | 453 | #endif |
0f2d19dd JB |
454 | longjmp (SCM_JMPBUF (scm_rootcont), 1); |
455 | } | |
456 | } | |
457 | } | |
0f2d19dd JB |
458 | for (wind_goal = scm_dynwinds; |
459 | SCM_CDAR (wind_goal) != jmpbuf; | |
460 | wind_goal = SCM_CDR (wind_goal)) | |
461 | ; | |
11702758 MD |
462 | if (!SCM_JMPBUFP (jmpbuf)) |
463 | { | |
97a307b9 MD |
464 | SCM oldwinds = scm_dynwinds; |
465 | SCM handle, answer; | |
466 | scm_dowinds (wind_goal, scm_ilength (scm_dynwinds) - scm_ilength (wind_goal)); | |
11702758 | 467 | SCM_REDEFER_INTS; |
97a307b9 | 468 | handle = scm_dynwinds; |
11702758 MD |
469 | scm_dynwinds = SCM_CDR (scm_dynwinds); |
470 | SCM_REALLOW_INTS; | |
97a307b9 MD |
471 | answer = scm_apply (jmpbuf, scm_cons (key, args), SCM_EOL); |
472 | SCM_REDEFER_INTS; | |
473 | SCM_SETCDR (handle, scm_dynwinds); | |
474 | scm_dynwinds = handle; | |
475 | SCM_REALLOW_INTS; | |
476 | scm_dowinds (oldwinds, scm_ilength (scm_dynwinds) - scm_ilength (oldwinds)); | |
477 | return answer; | |
11702758 MD |
478 | } |
479 | else | |
480 | { | |
481 | struct jmp_buf_and_retval * jbr; | |
97a307b9 | 482 | scm_dowinds (wind_goal, scm_ilength (scm_dynwinds) - scm_ilength (wind_goal)); |
11702758 MD |
483 | jbr = (struct jmp_buf_and_retval *)JBJMPBUF (jmpbuf); |
484 | jbr->throw_tag = key; | |
485 | jbr->retval = args; | |
486 | } | |
faa6b3df | 487 | #ifdef DEBUG_EXTENSIONS |
e68b42c1 | 488 | scm_last_debug_frame = SCM_JBDFRAME (jmpbuf); |
faa6b3df | 489 | #endif |
0f2d19dd JB |
490 | longjmp (*JBJMPBUF (jmpbuf), 1); |
491 | } | |
492 | ||
493 | ||
0f2d19dd JB |
494 | void |
495 | scm_init_throw () | |
0f2d19dd JB |
496 | { |
497 | scm_tc16_jmpbuffer = scm_newsmob (&jbsmob); | |
0f2d19dd JB |
498 | #include "throw.x" |
499 | } |