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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
1182a7cb DL |
2 | Copyright (C) 1985, 86, 87, 93, 94, 95, 99, 2000 |
3 | Free Software Foundation, Inc. | |
db9f0278 JB |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
96277b2d | 9 | the Free Software Foundation; either version 2, or (at your option) |
db9f0278 JB |
10 | any later version. |
11 | ||
12 | GNU Emacs 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. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
db9f0278 JB |
21 | |
22 | ||
18160b98 | 23 | #include <config.h> |
db9f0278 | 24 | #include "lisp.h" |
9ac0d9e0 | 25 | #include "blockinput.h" |
db9f0278 | 26 | #include "commands.h" |
1f98fa48 | 27 | #include "keyboard.h" |
3648c842 | 28 | #include "dispextern.h" |
db9f0278 JB |
29 | #include <setjmp.h> |
30 | ||
31 | /* This definition is duplicated in alloc.c and keyboard.c */ | |
32 | /* Putting it in lisp.h makes cc bomb out! */ | |
33 | ||
34 | struct backtrace | |
4c576a83 GM |
35 | { |
36 | struct backtrace *next; | |
37 | Lisp_Object *function; | |
38 | Lisp_Object *args; /* Points to vector of args. */ | |
39 | int nargs; /* Length of vector. | |
daa37602 JB |
40 | If nargs is UNEVALLED, args points to slot holding |
41 | list of unevalled args */ | |
4c576a83 GM |
42 | char evalargs; |
43 | /* Nonzero means call value of debugger when done with this operation. */ | |
44 | char debug_on_exit; | |
45 | }; | |
db9f0278 JB |
46 | |
47 | struct backtrace *backtrace_list; | |
48 | ||
82da7701 JB |
49 | /* This structure helps implement the `catch' and `throw' control |
50 | structure. A struct catchtag contains all the information needed | |
51 | to restore the state of the interpreter after a non-local jump. | |
52 | ||
53 | Handlers for error conditions (represented by `struct handler' | |
54 | structures) just point to a catch tag to do the cleanup required | |
55 | for their jumps. | |
56 | ||
57 | catchtag structures are chained together in the C calling stack; | |
58 | the `next' member points to the next outer catchtag. | |
59 | ||
60 | A call like (throw TAG VAL) searches for a catchtag whose `tag' | |
61 | member is TAG, and then unbinds to it. The `val' member is used to | |
62 | hold VAL while the stack is unwound; `val' is returned as the value | |
63 | of the catch form. | |
64 | ||
65 | All the other members are concerned with restoring the interpreter | |
66 | state. */ | |
4c576a83 | 67 | |
db9f0278 | 68 | struct catchtag |
4c576a83 GM |
69 | { |
70 | Lisp_Object tag; | |
71 | Lisp_Object val; | |
72 | struct catchtag *next; | |
73 | struct gcpro *gcpro; | |
74 | jmp_buf jmp; | |
75 | struct backtrace *backlist; | |
76 | struct handler *handlerlist; | |
77 | int lisp_eval_depth; | |
78 | int pdlcount; | |
79 | int poll_suppress_count; | |
80 | struct byte_stack *byte_stack; | |
81 | }; | |
db9f0278 JB |
82 | |
83 | struct catchtag *catchlist; | |
84 | ||
15934ffa RS |
85 | #ifdef DEBUG_GCPRO |
86 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
87 | int gcpro_level; | |
88 | #endif | |
89 | ||
db9f0278 | 90 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
ad236261 | 91 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
db9f0278 JB |
92 | Lisp_Object Qmocklisp_arguments, Vmocklisp_arguments, Qmocklisp; |
93 | Lisp_Object Qand_rest, Qand_optional; | |
94 | Lisp_Object Qdebug_on_error; | |
95 | ||
6e6e9f08 RS |
96 | /* This holds either the symbol `run-hooks' or nil. |
97 | It is nil at an early stage of startup, and when Emacs | |
98 | is shutting down. */ | |
4c576a83 | 99 | |
db9f0278 JB |
100 | Lisp_Object Vrun_hooks; |
101 | ||
102 | /* Non-nil means record all fset's and provide's, to be undone | |
103 | if the file being autoloaded is not fully loaded. | |
104 | They are recorded by being consed onto the front of Vautoload_queue: | |
105 | (FUN . ODEF) for a defun, (OFEATURES . nil) for a provide. */ | |
106 | ||
107 | Lisp_Object Vautoload_queue; | |
108 | ||
109 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 110 | |
db9f0278 JB |
111 | int specpdl_size; |
112 | ||
113 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 114 | |
db9f0278 JB |
115 | struct specbinding *specpdl; |
116 | ||
117 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 118 | |
db9f0278 JB |
119 | struct specbinding *specpdl_ptr; |
120 | ||
121 | /* Maximum size allowed for specpdl allocation */ | |
4c576a83 | 122 | |
db9f0278 JB |
123 | int max_specpdl_size; |
124 | ||
125 | /* Depth in Lisp evaluations and function calls. */ | |
4c576a83 | 126 | |
db9f0278 JB |
127 | int lisp_eval_depth; |
128 | ||
129 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
4c576a83 | 130 | |
db9f0278 JB |
131 | int max_lisp_eval_depth; |
132 | ||
133 | /* Nonzero means enter debugger before next function call */ | |
4c576a83 | 134 | |
db9f0278 JB |
135 | int debug_on_next_call; |
136 | ||
556d7314 GM |
137 | /* Non-zero means debuffer may continue. This is zero when the |
138 | debugger is called during redisplay, where it might not be safe to | |
139 | continue the interrupted redisplay. */ | |
140 | ||
141 | int debugger_may_continue; | |
142 | ||
128c0f66 | 143 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 144 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 145 | |
128c0f66 | 146 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 147 | |
128c0f66 | 148 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 149 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 150 | |
128c0f66 | 151 | Lisp_Object Vdebug_on_error; |
db9f0278 | 152 | |
fc950e09 KH |
153 | /* List of conditions and regexps specifying error messages which |
154 | do not enter the debugger even if Vdebug_on_errors says they should. */ | |
4c576a83 | 155 | |
fc950e09 KH |
156 | Lisp_Object Vdebug_ignored_errors; |
157 | ||
61ede770 | 158 | /* Non-nil means call the debugger even if the error will be handled. */ |
4c576a83 | 159 | |
57a6e758 | 160 | Lisp_Object Vdebug_on_signal; |
61ede770 RS |
161 | |
162 | /* Hook for edebug to use. */ | |
4c576a83 | 163 | |
61ede770 RS |
164 | Lisp_Object Vsignal_hook_function; |
165 | ||
db9f0278 | 166 | /* Nonzero means enter debugger if a quit signal |
128c0f66 | 167 | is handled by the command loop's error handler. */ |
4c576a83 | 168 | |
db9f0278 JB |
169 | int debug_on_quit; |
170 | ||
be857679 | 171 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 172 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 173 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
174 | know that the debugger itself has an error, and we should just |
175 | signal the error instead of entering an infinite loop of debugger | |
176 | invocations. */ | |
4c576a83 | 177 | |
82da7701 | 178 | int when_entered_debugger; |
db9f0278 JB |
179 | |
180 | Lisp_Object Vdebugger; | |
181 | ||
a2ff3819 GM |
182 | /* The function from which the last `signal' was called. Set in |
183 | Fsignal. */ | |
184 | ||
185 | Lisp_Object Vsignaling_function; | |
186 | ||
4c576a83 GM |
187 | /* Set to non-zero while processing X events. Checked in Feval to |
188 | make sure the Lisp interpreter isn't called from a signal handler, | |
189 | which is unsafe because the interpreter isn't reentrant. */ | |
190 | ||
191 | int handling_signal; | |
192 | ||
db9f0278 JB |
193 | void specbind (), record_unwind_protect (); |
194 | ||
420e60e6 RS |
195 | Lisp_Object run_hook_with_args (); |
196 | ||
db9f0278 JB |
197 | Lisp_Object funcall_lambda (); |
198 | extern Lisp_Object ml_apply (); /* Apply a mocklisp function to unevaluated argument list */ | |
199 | ||
dfcf069d | 200 | void |
db9f0278 JB |
201 | init_eval_once () |
202 | { | |
203 | specpdl_size = 50; | |
716acfce | 204 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 205 | specpdl_ptr = specpdl; |
db9f0278 | 206 | max_specpdl_size = 600; |
969f5145 | 207 | max_lisp_eval_depth = 300; |
34d470ba RS |
208 | |
209 | Vrun_hooks = Qnil; | |
db9f0278 JB |
210 | } |
211 | ||
dfcf069d | 212 | void |
db9f0278 JB |
213 | init_eval () |
214 | { | |
215 | specpdl_ptr = specpdl; | |
216 | catchlist = 0; | |
217 | handlerlist = 0; | |
218 | backtrace_list = 0; | |
219 | Vquit_flag = Qnil; | |
220 | debug_on_next_call = 0; | |
221 | lisp_eval_depth = 0; | |
87e21fbd | 222 | #ifdef DEBUG_GCPRO |
15934ffa | 223 | gcpro_level = 0; |
87e21fbd | 224 | #endif |
be857679 | 225 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 226 | when_entered_debugger = -1; |
db9f0278 JB |
227 | } |
228 | ||
229 | Lisp_Object | |
230 | call_debugger (arg) | |
231 | Lisp_Object arg; | |
232 | { | |
3648c842 | 233 | int debug_while_redisplaying; |
556d7314 | 234 | int count = specpdl_ptr - specpdl; |
3648c842 GM |
235 | Lisp_Object val; |
236 | ||
db9f0278 JB |
237 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) |
238 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
3648c842 | 239 | |
db9f0278 JB |
240 | if (specpdl_size + 40 > max_specpdl_size) |
241 | max_specpdl_size = specpdl_size + 40; | |
3648c842 | 242 | |
237c23b0 GM |
243 | #ifdef HAVE_X_WINDOWS |
244 | if (display_busy_cursor_p) | |
245 | cancel_busy_cursor (); | |
246 | #endif | |
247 | ||
db9f0278 | 248 | debug_on_next_call = 0; |
be857679 | 249 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
250 | |
251 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
252 | displayed if the debugger is invoked during redisplay. */ | |
253 | debug_while_redisplaying = redisplaying_p; | |
254 | redisplaying_p = 0; | |
556d7314 GM |
255 | specbind (intern ("debugger-may-continue"), |
256 | debug_while_redisplaying ? Qnil : Qt); | |
3648c842 GM |
257 | |
258 | val = apply1 (Vdebugger, arg); | |
259 | ||
260 | /* Interrupting redisplay and resuming it later is not safe under | |
261 | all circumstances. So, when the debugger returns, abort the | |
262 | interupted redisplay by going back to the top-level. */ | |
263 | if (debug_while_redisplaying) | |
264 | Ftop_level (); | |
265 | ||
556d7314 | 266 | return unbind_to (count, val); |
db9f0278 JB |
267 | } |
268 | ||
dfcf069d | 269 | void |
db9f0278 JB |
270 | do_debug_on_call (code) |
271 | Lisp_Object code; | |
272 | { | |
273 | debug_on_next_call = 0; | |
274 | backtrace_list->debug_on_exit = 1; | |
275 | call_debugger (Fcons (code, Qnil)); | |
276 | } | |
277 | \f | |
278 | /* NOTE!!! Every function that can call EVAL must protect its args | |
279 | and temporaries from garbage collection while it needs them. | |
280 | The definition of `For' shows what you have to do. */ | |
281 | ||
282 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
283 | "Eval args until one of them yields non-nil, then return that value.\n\ | |
284 | The remaining args are not evalled at all.\n\ | |
285 | If all args return nil, return nil.") | |
286 | (args) | |
287 | Lisp_Object args; | |
288 | { | |
289 | register Lisp_Object val; | |
290 | Lisp_Object args_left; | |
291 | struct gcpro gcpro1; | |
292 | ||
265a9e55 | 293 | if (NILP(args)) |
db9f0278 JB |
294 | return Qnil; |
295 | ||
296 | args_left = args; | |
297 | GCPRO1 (args_left); | |
298 | ||
299 | do | |
300 | { | |
301 | val = Feval (Fcar (args_left)); | |
265a9e55 | 302 | if (!NILP (val)) |
db9f0278 JB |
303 | break; |
304 | args_left = Fcdr (args_left); | |
305 | } | |
265a9e55 | 306 | while (!NILP(args_left)); |
db9f0278 JB |
307 | |
308 | UNGCPRO; | |
309 | return val; | |
310 | } | |
311 | ||
312 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
313 | "Eval args until one of them yields nil, then return nil.\n\ | |
314 | The remaining args are not evalled at all.\n\ | |
315 | If no arg yields nil, return the last arg's value.") | |
316 | (args) | |
317 | Lisp_Object args; | |
318 | { | |
319 | register Lisp_Object val; | |
320 | Lisp_Object args_left; | |
321 | struct gcpro gcpro1; | |
322 | ||
265a9e55 | 323 | if (NILP(args)) |
db9f0278 JB |
324 | return Qt; |
325 | ||
326 | args_left = args; | |
327 | GCPRO1 (args_left); | |
328 | ||
329 | do | |
330 | { | |
331 | val = Feval (Fcar (args_left)); | |
265a9e55 | 332 | if (NILP (val)) |
db9f0278 JB |
333 | break; |
334 | args_left = Fcdr (args_left); | |
335 | } | |
265a9e55 | 336 | while (!NILP(args_left)); |
db9f0278 JB |
337 | |
338 | UNGCPRO; | |
339 | return val; | |
340 | } | |
341 | ||
342 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
1182a7cb | 343 | "If COND yields non-nil, do THEN, else do ELSE...\n\ |
db9f0278 JB |
344 | Returns the value of THEN or the value of the last of the ELSE's.\n\ |
345 | THEN must be one expression, but ELSE... can be zero or more expressions.\n\ | |
346 | If COND yields nil, and there are no ELSE's, the value is nil.") | |
347 | (args) | |
348 | Lisp_Object args; | |
349 | { | |
350 | register Lisp_Object cond; | |
351 | struct gcpro gcpro1; | |
352 | ||
353 | GCPRO1 (args); | |
354 | cond = Feval (Fcar (args)); | |
355 | UNGCPRO; | |
356 | ||
265a9e55 | 357 | if (!NILP (cond)) |
db9f0278 JB |
358 | return Feval (Fcar (Fcdr (args))); |
359 | return Fprogn (Fcdr (Fcdr (args))); | |
360 | } | |
361 | ||
362 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
1182a7cb | 363 | "Try each clause until one succeeds.\n\ |
db9f0278 JB |
364 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated\n\ |
365 | and, if the value is non-nil, this clause succeeds:\n\ | |
366 | then the expressions in BODY are evaluated and the last one's\n\ | |
367 | value is the value of the cond-form.\n\ | |
368 | If no clause succeeds, cond returns nil.\n\ | |
369 | If a clause has one element, as in (CONDITION),\n\ | |
370 | CONDITION's value if non-nil is returned from the cond-form.") | |
371 | (args) | |
372 | Lisp_Object args; | |
373 | { | |
374 | register Lisp_Object clause, val; | |
375 | struct gcpro gcpro1; | |
376 | ||
377 | val = Qnil; | |
378 | GCPRO1 (args); | |
265a9e55 | 379 | while (!NILP (args)) |
db9f0278 JB |
380 | { |
381 | clause = Fcar (args); | |
382 | val = Feval (Fcar (clause)); | |
265a9e55 | 383 | if (!NILP (val)) |
db9f0278 | 384 | { |
03699b14 KR |
385 | if (!EQ (XCDR (clause), Qnil)) |
386 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
387 | break; |
388 | } | |
03699b14 | 389 | args = XCDR (args); |
db9f0278 JB |
390 | } |
391 | UNGCPRO; | |
392 | ||
393 | return val; | |
394 | } | |
395 | ||
396 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
1182a7cb | 397 | "Eval BODY forms sequentially and return value of last one.") |
db9f0278 JB |
398 | (args) |
399 | Lisp_Object args; | |
400 | { | |
401 | register Lisp_Object val, tem; | |
402 | Lisp_Object args_left; | |
403 | struct gcpro gcpro1; | |
404 | ||
405 | /* In Mocklisp code, symbols at the front of the progn arglist | |
406 | are to be bound to zero. */ | |
407 | if (!EQ (Vmocklisp_arguments, Qt)) | |
408 | { | |
409 | val = make_number (0); | |
90165123 | 410 | while (!NILP (args) && (tem = Fcar (args), SYMBOLP (tem))) |
db9f0278 JB |
411 | { |
412 | QUIT; | |
413 | specbind (tem, val), args = Fcdr (args); | |
414 | } | |
415 | } | |
416 | ||
265a9e55 | 417 | if (NILP(args)) |
db9f0278 JB |
418 | return Qnil; |
419 | ||
420 | args_left = args; | |
421 | GCPRO1 (args_left); | |
422 | ||
423 | do | |
424 | { | |
425 | val = Feval (Fcar (args_left)); | |
426 | args_left = Fcdr (args_left); | |
427 | } | |
265a9e55 | 428 | while (!NILP(args_left)); |
db9f0278 JB |
429 | |
430 | UNGCPRO; | |
431 | return val; | |
432 | } | |
433 | ||
434 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
1182a7cb | 435 | "Eval FIRST and BODY sequentially; value from FIRST.\n\ |
db9f0278 JB |
436 | The value of FIRST is saved during the evaluation of the remaining args,\n\ |
437 | whose values are discarded.") | |
438 | (args) | |
439 | Lisp_Object args; | |
440 | { | |
441 | Lisp_Object val; | |
442 | register Lisp_Object args_left; | |
443 | struct gcpro gcpro1, gcpro2; | |
444 | register int argnum = 0; | |
445 | ||
265a9e55 | 446 | if (NILP(args)) |
db9f0278 JB |
447 | return Qnil; |
448 | ||
449 | args_left = args; | |
450 | val = Qnil; | |
451 | GCPRO2 (args, val); | |
452 | ||
453 | do | |
454 | { | |
455 | if (!(argnum++)) | |
456 | val = Feval (Fcar (args_left)); | |
457 | else | |
458 | Feval (Fcar (args_left)); | |
459 | args_left = Fcdr (args_left); | |
460 | } | |
265a9e55 | 461 | while (!NILP(args_left)); |
db9f0278 JB |
462 | |
463 | UNGCPRO; | |
464 | return val; | |
465 | } | |
466 | ||
467 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
1182a7cb | 468 | "Eval X, Y and BODY sequentially; value from Y.\n\ |
db9f0278 JB |
469 | The value of Y is saved during the evaluation of the remaining args,\n\ |
470 | whose values are discarded.") | |
471 | (args) | |
472 | Lisp_Object args; | |
473 | { | |
474 | Lisp_Object val; | |
475 | register Lisp_Object args_left; | |
476 | struct gcpro gcpro1, gcpro2; | |
477 | register int argnum = -1; | |
478 | ||
479 | val = Qnil; | |
480 | ||
87d238ba | 481 | if (NILP (args)) |
db9f0278 JB |
482 | return Qnil; |
483 | ||
484 | args_left = args; | |
485 | val = Qnil; | |
486 | GCPRO2 (args, val); | |
487 | ||
488 | do | |
489 | { | |
490 | if (!(argnum++)) | |
491 | val = Feval (Fcar (args_left)); | |
492 | else | |
493 | Feval (Fcar (args_left)); | |
494 | args_left = Fcdr (args_left); | |
495 | } | |
87d238ba | 496 | while (!NILP (args_left)); |
db9f0278 JB |
497 | |
498 | UNGCPRO; | |
499 | return val; | |
500 | } | |
501 | ||
502 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
1182a7cb | 503 | "Set each SYM to the value of its VAL.\n\ |
b0d75191 RS |
504 | The symbols SYM are variables; they are literal (not evaluated).\n\ |
505 | The values VAL are expressions; they are evaluated.\n\ | |
506 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.\n\ | |
507 | The second VAL is not computed until after the first SYM is set, and so on;\n\ | |
508 | each VAL can use the new value of variables set earlier in the `setq'.\n\ | |
196e7d3f | 509 | The return value of the `setq' form is the value of the last VAL.") |
db9f0278 JB |
510 | (args) |
511 | Lisp_Object args; | |
512 | { | |
513 | register Lisp_Object args_left; | |
514 | register Lisp_Object val, sym; | |
515 | struct gcpro gcpro1; | |
516 | ||
265a9e55 | 517 | if (NILP(args)) |
db9f0278 JB |
518 | return Qnil; |
519 | ||
520 | args_left = args; | |
521 | GCPRO1 (args); | |
522 | ||
523 | do | |
524 | { | |
525 | val = Feval (Fcar (Fcdr (args_left))); | |
526 | sym = Fcar (args_left); | |
527 | Fset (sym, val); | |
528 | args_left = Fcdr (Fcdr (args_left)); | |
529 | } | |
265a9e55 | 530 | while (!NILP(args_left)); |
db9f0278 JB |
531 | |
532 | UNGCPRO; | |
533 | return val; | |
534 | } | |
535 | ||
536 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, | |
537 | "Return the argument, without evaluating it. `(quote x)' yields `x'.") | |
538 | (args) | |
539 | Lisp_Object args; | |
540 | { | |
541 | return Fcar (args); | |
542 | } | |
543 | ||
544 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, | |
545 | "Like `quote', but preferred for objects which are functions.\n\ | |
546 | In byte compilation, `function' causes its argument to be compiled.\n\ | |
547 | `quote' cannot do that.") | |
548 | (args) | |
549 | Lisp_Object args; | |
550 | { | |
551 | return Fcar (args); | |
552 | } | |
553 | ||
554 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, | |
555 | "Return t if function in which this appears was called interactively.\n\ | |
556 | This means that the function was called with call-interactively (which\n\ | |
557 | includes being called as the binding of a key)\n\ | |
558 | and input is currently coming from the keyboard (not in keyboard macro).") | |
559 | () | |
560 | { | |
561 | register struct backtrace *btp; | |
562 | register Lisp_Object fun; | |
563 | ||
564 | if (!INTERACTIVE) | |
565 | return Qnil; | |
566 | ||
db9f0278 | 567 | btp = backtrace_list; |
daa37602 JB |
568 | |
569 | /* If this isn't a byte-compiled function, there may be a frame at | |
570 | the top for Finteractive_p itself. If so, skip it. */ | |
571 | fun = Findirect_function (*btp->function); | |
0598f773 | 572 | if (SUBRP (fun) && XSUBR (fun) == &Sinteractive_p) |
db9f0278 | 573 | btp = btp->next; |
daa37602 JB |
574 | |
575 | /* If we're running an Emacs 18-style byte-compiled function, there | |
576 | may be a frame for Fbytecode. Now, given the strictest | |
577 | definition, this function isn't really being called | |
578 | interactively, but because that's the way Emacs 18 always builds | |
579 | byte-compiled functions, we'll accept it for now. */ | |
580 | if (EQ (*btp->function, Qbytecode)) | |
581 | btp = btp->next; | |
582 | ||
583 | /* If this isn't a byte-compiled function, then we may now be | |
584 | looking at several frames for special forms. Skip past them. */ | |
585 | while (btp && | |
586 | btp->nargs == UNEVALLED) | |
a6e3fa71 JB |
587 | btp = btp->next; |
588 | ||
daa37602 JB |
589 | /* btp now points at the frame of the innermost function that isn't |
590 | a special form, ignoring frames for Finteractive_p and/or | |
591 | Fbytecode at the top. If this frame is for a built-in function | |
592 | (such as load or eval-region) return nil. */ | |
ffd56f97 | 593 | fun = Findirect_function (*btp->function); |
90165123 | 594 | if (SUBRP (fun)) |
db9f0278 JB |
595 | return Qnil; |
596 | /* btp points to the frame of a Lisp function that called interactive-p. | |
597 | Return t if that function was called interactively. */ | |
598 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
599 | return Qt; | |
600 | return Qnil; | |
601 | } | |
602 | ||
603 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, | |
1182a7cb | 604 | "Define NAME as a function.\n\ |
db9f0278 JB |
605 | The definition is (lambda ARGLIST [DOCSTRING] BODY...).\n\ |
606 | See also the function `interactive'.") | |
607 | (args) | |
608 | Lisp_Object args; | |
609 | { | |
610 | register Lisp_Object fn_name; | |
611 | register Lisp_Object defn; | |
612 | ||
613 | fn_name = Fcar (args); | |
614 | defn = Fcons (Qlambda, Fcdr (args)); | |
265a9e55 | 615 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
616 | defn = Fpurecopy (defn); |
617 | Ffset (fn_name, defn); | |
2a49b6e5 | 618 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
619 | return fn_name; |
620 | } | |
621 | ||
622 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
1182a7cb | 623 | "Define NAME as a macro.\n\ |
db9f0278 JB |
624 | The definition is (macro lambda ARGLIST [DOCSTRING] BODY...).\n\ |
625 | When the macro is called, as in (NAME ARGS...),\n\ | |
626 | the function (lambda ARGLIST BODY...) is applied to\n\ | |
627 | the list ARGS... as it appears in the expression,\n\ | |
628 | and the result should be a form to be evaluated instead of the original.") | |
629 | (args) | |
630 | Lisp_Object args; | |
631 | { | |
632 | register Lisp_Object fn_name; | |
633 | register Lisp_Object defn; | |
634 | ||
635 | fn_name = Fcar (args); | |
636 | defn = Fcons (Qmacro, Fcons (Qlambda, Fcdr (args))); | |
265a9e55 | 637 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
638 | defn = Fpurecopy (defn); |
639 | Ffset (fn_name, defn); | |
2a49b6e5 | 640 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
641 | return fn_name; |
642 | } | |
643 | ||
644 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, | |
1182a7cb | 645 | "Define SYMBOL as a variable.\n\ |
db9f0278 JB |
646 | You are not required to define a variable in order to use it,\n\ |
647 | but the definition can supply documentation and an initial value\n\ | |
648 | in a way that tags can recognize.\n\n\ | |
649 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.\n\ | |
06ef7355 RS |
650 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
651 | buffer-local values are not affected.\n\ | |
db9f0278 JB |
652 | INITVALUE and DOCSTRING are optional.\n\ |
653 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ | |
654 | This means that M-x set-variable and M-x edit-options recognize it.\n\ | |
655 | If INITVALUE is missing, SYMBOL's value is not set.") | |
656 | (args) | |
657 | Lisp_Object args; | |
658 | { | |
a42ba017 | 659 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
660 | |
661 | sym = Fcar (args); | |
a42ba017 RS |
662 | tail = Fcdr (args); |
663 | if (!NILP (Fcdr (Fcdr (tail)))) | |
664 | error ("too many arguments"); | |
665 | ||
666 | if (!NILP (tail)) | |
db9f0278 JB |
667 | { |
668 | tem = Fdefault_boundp (sym); | |
265a9e55 | 669 | if (NILP (tem)) |
db9f0278 JB |
670 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); |
671 | } | |
a42ba017 RS |
672 | tail = Fcdr (Fcdr (args)); |
673 | if (!NILP (Fcar (tail))) | |
db9f0278 | 674 | { |
ca248607 | 675 | tem = Fcar (tail); |
265a9e55 | 676 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
677 | tem = Fpurecopy (tem); |
678 | Fput (sym, Qvariable_documentation, tem); | |
679 | } | |
2a49b6e5 | 680 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
681 | return sym; |
682 | } | |
683 | ||
684 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
1182a7cb | 685 | "Define SYMBOL as a constant variable.\n\ |
c569512a | 686 | The intent is that neither programs nor users should ever change this value.\n\ |
db9f0278 | 687 | Always sets the value of SYMBOL to the result of evalling INITVALUE.\n\ |
06ef7355 RS |
688 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
689 | buffer-local values are not affected.\n\ | |
701b1ec2 | 690 | DOCSTRING is optional.") |
db9f0278 JB |
691 | (args) |
692 | Lisp_Object args; | |
693 | { | |
694 | register Lisp_Object sym, tem; | |
695 | ||
696 | sym = Fcar (args); | |
a42ba017 RS |
697 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
698 | error ("too many arguments"); | |
699 | ||
1182a7cb DL |
700 | tem = Feval (Fcar (Fcdr (args))); |
701 | if (!NILP (Vpurify_flag)) | |
702 | tem = Fpurecopy (tem); | |
703 | Fset_default (sym, tem); | |
db9f0278 | 704 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 705 | if (!NILP (tem)) |
db9f0278 | 706 | { |
265a9e55 | 707 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
708 | tem = Fpurecopy (tem); |
709 | Fput (sym, Qvariable_documentation, tem); | |
710 | } | |
2a49b6e5 | 711 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
712 | return sym; |
713 | } | |
714 | ||
715 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, | |
716 | "Returns t if VARIABLE is intended to be set and modified by users.\n\ | |
717 | \(The alternative is a variable used internally in a Lisp program.)\n\ | |
718 | Determined by whether the first character of the documentation\n\ | |
caff32a7 DL |
719 | for the variable is `*' or if the variable is customizable (has a non-nil\n\ |
720 | value of any of `custom-type', `custom-loads' or `standard-value'\n\ | |
721 | on its property list).") | |
db9f0278 JB |
722 | (variable) |
723 | Lisp_Object variable; | |
724 | { | |
725 | Lisp_Object documentation; | |
726 | ||
5e78e475 RS |
727 | if (!SYMBOLP (variable)) |
728 | return Qnil; | |
729 | ||
db9f0278 | 730 | documentation = Fget (variable, Qvariable_documentation); |
90165123 | 731 | if (INTEGERP (documentation) && XINT (documentation) < 0) |
db9f0278 | 732 | return Qt; |
65411977 RS |
733 | if (STRINGP (documentation) |
734 | && ((unsigned char) XSTRING (documentation)->data[0] == '*')) | |
735 | return Qt; | |
736 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ | |
737 | if (CONSP (documentation) | |
03699b14 KR |
738 | && STRINGP (XCAR (documentation)) |
739 | && INTEGERP (XCDR (documentation)) | |
740 | && XINT (XCDR (documentation)) < 0) | |
db9f0278 | 741 | return Qt; |
caff32a7 DL |
742 | /* Customizable? */ |
743 | if ((!NILP (Fget (variable, intern ("custom-type")))) | |
744 | || (!NILP (Fget (variable, intern ("custom-loads")))) | |
745 | || (!NILP (Fget (variable, intern ("standard-value"))))) | |
746 | return Qt; | |
db9f0278 JB |
747 | return Qnil; |
748 | } | |
749 | \f | |
750 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
1182a7cb | 751 | "Bind variables according to VARLIST then eval BODY.\n\ |
db9f0278 JB |
752 | The value of the last form in BODY is returned.\n\ |
753 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
754 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
755 | Each VALUEFORM can refer to the symbols already bound by this VARLIST.") | |
756 | (args) | |
757 | Lisp_Object args; | |
758 | { | |
759 | Lisp_Object varlist, val, elt; | |
760 | int count = specpdl_ptr - specpdl; | |
761 | struct gcpro gcpro1, gcpro2, gcpro3; | |
762 | ||
763 | GCPRO3 (args, elt, varlist); | |
764 | ||
765 | varlist = Fcar (args); | |
265a9e55 | 766 | while (!NILP (varlist)) |
db9f0278 JB |
767 | { |
768 | QUIT; | |
769 | elt = Fcar (varlist); | |
90165123 | 770 | if (SYMBOLP (elt)) |
db9f0278 | 771 | specbind (elt, Qnil); |
08564963 JB |
772 | else if (! NILP (Fcdr (Fcdr (elt)))) |
773 | Fsignal (Qerror, | |
774 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
775 | elt)); | |
db9f0278 JB |
776 | else |
777 | { | |
778 | val = Feval (Fcar (Fcdr (elt))); | |
779 | specbind (Fcar (elt), val); | |
780 | } | |
781 | varlist = Fcdr (varlist); | |
782 | } | |
783 | UNGCPRO; | |
784 | val = Fprogn (Fcdr (args)); | |
785 | return unbind_to (count, val); | |
786 | } | |
787 | ||
788 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
1182a7cb | 789 | "Bind variables according to VARLIST then eval BODY.\n\ |
db9f0278 JB |
790 | The value of the last form in BODY is returned.\n\ |
791 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
792 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
793 | All the VALUEFORMs are evalled before any symbols are bound.") | |
794 | (args) | |
795 | Lisp_Object args; | |
796 | { | |
797 | Lisp_Object *temps, tem; | |
798 | register Lisp_Object elt, varlist; | |
799 | int count = specpdl_ptr - specpdl; | |
800 | register int argnum; | |
801 | struct gcpro gcpro1, gcpro2; | |
802 | ||
803 | varlist = Fcar (args); | |
804 | ||
805 | /* Make space to hold the values to give the bound variables */ | |
806 | elt = Flength (varlist); | |
807 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
808 | ||
809 | /* Compute the values and store them in `temps' */ | |
810 | ||
811 | GCPRO2 (args, *temps); | |
812 | gcpro2.nvars = 0; | |
813 | ||
265a9e55 | 814 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
815 | { |
816 | QUIT; | |
817 | elt = Fcar (varlist); | |
90165123 | 818 | if (SYMBOLP (elt)) |
db9f0278 | 819 | temps [argnum++] = Qnil; |
08564963 JB |
820 | else if (! NILP (Fcdr (Fcdr (elt)))) |
821 | Fsignal (Qerror, | |
822 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
823 | elt)); | |
db9f0278 JB |
824 | else |
825 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
826 | gcpro2.nvars = argnum; | |
827 | } | |
828 | UNGCPRO; | |
829 | ||
830 | varlist = Fcar (args); | |
265a9e55 | 831 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
832 | { |
833 | elt = Fcar (varlist); | |
834 | tem = temps[argnum++]; | |
90165123 | 835 | if (SYMBOLP (elt)) |
db9f0278 JB |
836 | specbind (elt, tem); |
837 | else | |
838 | specbind (Fcar (elt), tem); | |
839 | } | |
840 | ||
841 | elt = Fprogn (Fcdr (args)); | |
842 | return unbind_to (count, elt); | |
843 | } | |
844 | ||
845 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
1182a7cb | 846 | "If TEST yields non-nil, eval BODY... and repeat.\n\ |
db9f0278 JB |
847 | The order of execution is thus TEST, BODY, TEST, BODY and so on\n\ |
848 | until TEST returns nil.") | |
849 | (args) | |
850 | Lisp_Object args; | |
851 | { | |
852 | Lisp_Object test, body, tem; | |
853 | struct gcpro gcpro1, gcpro2; | |
854 | ||
855 | GCPRO2 (test, body); | |
856 | ||
857 | test = Fcar (args); | |
858 | body = Fcdr (args); | |
e3c24a74 RS |
859 | while (tem = Feval (test), |
860 | (!EQ (Vmocklisp_arguments, Qt) ? XINT (tem) : !NILP (tem))) | |
db9f0278 JB |
861 | { |
862 | QUIT; | |
863 | Fprogn (body); | |
864 | } | |
865 | ||
866 | UNGCPRO; | |
867 | return Qnil; | |
868 | } | |
869 | ||
870 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
871 | "Return result of expanding macros at top level of FORM.\n\ | |
872 | If FORM is not a macro call, it is returned unchanged.\n\ | |
873 | Otherwise, the macro is expanded and the expansion is considered\n\ | |
874 | in place of FORM. When a non-macro-call results, it is returned.\n\n\ | |
875 | The second optional arg ENVIRONMENT species an environment of macro\n\ | |
876 | definitions to shadow the loaded ones for use in file byte-compilation.") | |
79e8bfbf | 877 | (form, environment) |
2e267a2e | 878 | Lisp_Object form; |
79e8bfbf | 879 | Lisp_Object environment; |
db9f0278 | 880 | { |
23d6b5a6 | 881 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
882 | register Lisp_Object expander, sym, def, tem; |
883 | ||
884 | while (1) | |
885 | { | |
886 | /* Come back here each time we expand a macro call, | |
887 | in case it expands into another macro call. */ | |
90165123 | 888 | if (!CONSP (form)) |
db9f0278 | 889 | break; |
23d6b5a6 | 890 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 891 | def = sym = XCAR (form); |
23d6b5a6 | 892 | tem = Qnil; |
db9f0278 JB |
893 | /* Trace symbols aliases to other symbols |
894 | until we get a symbol that is not an alias. */ | |
90165123 | 895 | while (SYMBOLP (def)) |
db9f0278 JB |
896 | { |
897 | QUIT; | |
23d6b5a6 | 898 | sym = def; |
79e8bfbf | 899 | tem = Fassq (sym, environment); |
265a9e55 | 900 | if (NILP (tem)) |
db9f0278 JB |
901 | { |
902 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
903 | if (!EQ (def, Qunbound)) |
904 | continue; | |
db9f0278 | 905 | } |
23d6b5a6 | 906 | break; |
db9f0278 | 907 | } |
79e8bfbf | 908 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 909 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 910 | if (NILP (tem)) |
db9f0278 | 911 | { |
79e8bfbf | 912 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 913 | Look at its function definition. */ |
90165123 | 914 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
915 | /* Not defined or definition not suitable */ |
916 | break; | |
03699b14 | 917 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
918 | { |
919 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 920 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 921 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
922 | /* Yes, load it and try again. */ |
923 | { | |
ca20916b RS |
924 | struct gcpro gcpro1; |
925 | GCPRO1 (form); | |
ee9ee63c | 926 | do_autoload (def, sym); |
ca20916b | 927 | UNGCPRO; |
ee9ee63c JB |
928 | continue; |
929 | } | |
930 | else | |
db9f0278 | 931 | break; |
db9f0278 | 932 | } |
03699b14 | 933 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 934 | break; |
03699b14 | 935 | else expander = XCDR (def); |
db9f0278 JB |
936 | } |
937 | else | |
938 | { | |
03699b14 | 939 | expander = XCDR (tem); |
265a9e55 | 940 | if (NILP (expander)) |
db9f0278 JB |
941 | break; |
942 | } | |
03699b14 | 943 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
944 | } |
945 | return form; | |
946 | } | |
947 | \f | |
948 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
1182a7cb | 949 | "Eval BODY allowing nonlocal exits using `throw'.\n\ |
4e306308 RS |
950 | TAG is evalled to get the tag to use; it must not be nil.\n\ |
951 | \n\ | |
952 | Then the BODY is executed.\n\ | |
db9f0278 JB |
953 | Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.\n\ |
954 | If no throw happens, `catch' returns the value of the last BODY form.\n\ | |
955 | If a throw happens, it specifies the value to return from `catch'.") | |
956 | (args) | |
957 | Lisp_Object args; | |
958 | { | |
959 | register Lisp_Object tag; | |
960 | struct gcpro gcpro1; | |
961 | ||
962 | GCPRO1 (args); | |
963 | tag = Feval (Fcar (args)); | |
964 | UNGCPRO; | |
965 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
966 | } | |
967 | ||
968 | /* Set up a catch, then call C function FUNC on argument ARG. | |
969 | FUNC should return a Lisp_Object. | |
970 | This is how catches are done from within C code. */ | |
971 | ||
972 | Lisp_Object | |
973 | internal_catch (tag, func, arg) | |
974 | Lisp_Object tag; | |
975 | Lisp_Object (*func) (); | |
976 | Lisp_Object arg; | |
977 | { | |
978 | /* This structure is made part of the chain `catchlist'. */ | |
979 | struct catchtag c; | |
980 | ||
981 | /* Fill in the components of c, and put it on the list. */ | |
982 | c.next = catchlist; | |
983 | c.tag = tag; | |
984 | c.val = Qnil; | |
985 | c.backlist = backtrace_list; | |
986 | c.handlerlist = handlerlist; | |
987 | c.lisp_eval_depth = lisp_eval_depth; | |
988 | c.pdlcount = specpdl_ptr - specpdl; | |
989 | c.poll_suppress_count = poll_suppress_count; | |
990 | c.gcpro = gcprolist; | |
bcf28080 | 991 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
992 | catchlist = &c; |
993 | ||
994 | /* Call FUNC. */ | |
995 | if (! _setjmp (c.jmp)) | |
996 | c.val = (*func) (arg); | |
997 | ||
998 | /* Throw works by a longjmp that comes right here. */ | |
999 | catchlist = c.next; | |
1000 | return c.val; | |
1001 | } | |
1002 | ||
ba410f40 JB |
1003 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1004 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1005 | |
ba410f40 JB |
1006 | This is the guts Fthrow and Fsignal; they differ only in the way |
1007 | they choose the catch tag to throw to. A catch tag for a | |
1008 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1009 | |
ba410f40 JB |
1010 | Before each catch is discarded, unbind all special bindings and |
1011 | execute all unwind-protect clauses made above that catch. Unwind | |
1012 | the handler stack as we go, so that the proper handlers are in | |
1013 | effect for each unwind-protect clause we run. At the end, restore | |
1014 | some static info saved in CATCH, and longjmp to the location | |
1015 | specified in the | |
1016 | ||
1017 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1018 | |
1019 | static void | |
ba410f40 | 1020 | unwind_to_catch (catch, value) |
db9f0278 | 1021 | struct catchtag *catch; |
ba410f40 | 1022 | Lisp_Object value; |
db9f0278 JB |
1023 | { |
1024 | register int last_time; | |
1025 | ||
ba410f40 JB |
1026 | /* Save the value in the tag. */ |
1027 | catch->val = value; | |
1028 | ||
82da7701 | 1029 | /* Restore the polling-suppression count. */ |
1cdc3155 | 1030 | set_poll_suppress_count (catch->poll_suppress_count); |
82da7701 | 1031 | |
db9f0278 JB |
1032 | do |
1033 | { | |
1034 | last_time = catchlist == catch; | |
82da7701 JB |
1035 | |
1036 | /* Unwind the specpdl stack, and then restore the proper set of | |
1037 | handlers. */ | |
db9f0278 JB |
1038 | unbind_to (catchlist->pdlcount, Qnil); |
1039 | handlerlist = catchlist->handlerlist; | |
1040 | catchlist = catchlist->next; | |
1041 | } | |
1042 | while (! last_time); | |
1043 | ||
bcf28080 | 1044 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1045 | gcprolist = catch->gcpro; |
15934ffa RS |
1046 | #ifdef DEBUG_GCPRO |
1047 | if (gcprolist != 0) | |
1048 | gcpro_level = gcprolist->level + 1; | |
1049 | else | |
1050 | gcpro_level = 0; | |
1051 | #endif | |
db9f0278 JB |
1052 | backtrace_list = catch->backlist; |
1053 | lisp_eval_depth = catch->lisp_eval_depth; | |
ba410f40 JB |
1054 | |
1055 | _longjmp (catch->jmp, 1); | |
db9f0278 JB |
1056 | } |
1057 | ||
1058 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
1182a7cb | 1059 | "Throw to the catch for TAG and return VALUE from it.\n\ |
db9f0278 | 1060 | Both TAG and VALUE are evalled.") |
79e8bfbf EN |
1061 | (tag, value) |
1062 | register Lisp_Object tag, value; | |
db9f0278 JB |
1063 | { |
1064 | register struct catchtag *c; | |
1065 | ||
1066 | while (1) | |
1067 | { | |
265a9e55 | 1068 | if (!NILP (tag)) |
db9f0278 JB |
1069 | for (c = catchlist; c; c = c->next) |
1070 | { | |
1071 | if (EQ (c->tag, tag)) | |
79e8bfbf | 1072 | unwind_to_catch (c, value); |
db9f0278 | 1073 | } |
79e8bfbf | 1074 | tag = Fsignal (Qno_catch, Fcons (tag, Fcons (value, Qnil))); |
db9f0278 JB |
1075 | } |
1076 | } | |
1077 | ||
1078 | ||
1079 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
1080 | "Do BODYFORM, protecting with UNWINDFORMS.\n\ | |
db9f0278 JB |
1081 | If BODYFORM completes normally, its value is returned\n\ |
1082 | after executing the UNWINDFORMS.\n\ | |
1083 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.") | |
1084 | (args) | |
1085 | Lisp_Object args; | |
1086 | { | |
1087 | Lisp_Object val; | |
1088 | int count = specpdl_ptr - specpdl; | |
1089 | ||
1090 | record_unwind_protect (0, Fcdr (args)); | |
1091 | val = Feval (Fcar (args)); | |
1092 | return unbind_to (count, val); | |
1093 | } | |
1094 | \f | |
1095 | /* Chain of condition handlers currently in effect. | |
1096 | The elements of this chain are contained in the stack frames | |
1097 | of Fcondition_case and internal_condition_case. | |
1098 | When an error is signaled (by calling Fsignal, below), | |
1099 | this chain is searched for an element that applies. */ | |
1100 | ||
1101 | struct handler *handlerlist; | |
1102 | ||
1103 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
1104 | "Regain control when an error is signaled.\n\ | |
db9f0278 JB |
1105 | executes BODYFORM and returns its value if no error happens.\n\ |
1106 | Each element of HANDLERS looks like (CONDITION-NAME BODY...)\n\ | |
1107 | where the BODY is made of Lisp expressions.\n\n\ | |
1108 | A handler is applicable to an error\n\ | |
1109 | if CONDITION-NAME is one of the error's condition names.\n\ | |
1110 | If an error happens, the first applicable handler is run.\n\ | |
1111 | \n\ | |
633357d4 RS |
1112 | The car of a handler may be a list of condition names\n\ |
1113 | instead of a single condition name.\n\ | |
1114 | \n\ | |
db9f0278 JB |
1115 | When a handler handles an error,\n\ |
1116 | control returns to the condition-case and the handler BODY... is executed\n\ | |
1117 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).\n\ | |
1118 | VAR may be nil; then you do not get access to the signal information.\n\ | |
1119 | \n\ | |
1120 | The value of the last BODY form is returned from the condition-case.\n\ | |
1121 | See also the function `signal' for more info.") | |
1122 | (args) | |
1123 | Lisp_Object args; | |
1124 | { | |
1125 | Lisp_Object val; | |
1126 | struct catchtag c; | |
1127 | struct handler h; | |
82da7701 | 1128 | register Lisp_Object var, bodyform, handlers; |
db9f0278 | 1129 | |
82da7701 JB |
1130 | var = Fcar (args); |
1131 | bodyform = Fcar (Fcdr (args)); | |
1132 | handlers = Fcdr (Fcdr (args)); | |
1133 | CHECK_SYMBOL (var, 0); | |
1134 | ||
1135 | for (val = handlers; ! NILP (val); val = Fcdr (val)) | |
1136 | { | |
1137 | Lisp_Object tem; | |
1138 | tem = Fcar (val); | |
5f96776a RS |
1139 | if (! (NILP (tem) |
1140 | || (CONSP (tem) | |
03699b14 KR |
1141 | && (SYMBOLP (XCAR (tem)) |
1142 | || CONSP (XCAR (tem)))))) | |
82da7701 JB |
1143 | error ("Invalid condition handler", tem); |
1144 | } | |
db9f0278 JB |
1145 | |
1146 | c.tag = Qnil; | |
1147 | c.val = Qnil; | |
1148 | c.backlist = backtrace_list; | |
1149 | c.handlerlist = handlerlist; | |
1150 | c.lisp_eval_depth = lisp_eval_depth; | |
1151 | c.pdlcount = specpdl_ptr - specpdl; | |
1152 | c.poll_suppress_count = poll_suppress_count; | |
1153 | c.gcpro = gcprolist; | |
bcf28080 | 1154 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1155 | if (_setjmp (c.jmp)) |
1156 | { | |
265a9e55 | 1157 | if (!NILP (h.var)) |
9d58218c RS |
1158 | specbind (h.var, c.val); |
1159 | val = Fprogn (Fcdr (h.chosen_clause)); | |
82da7701 JB |
1160 | |
1161 | /* Note that this just undoes the binding of h.var; whoever | |
1162 | longjumped to us unwound the stack to c.pdlcount before | |
1163 | throwing. */ | |
db9f0278 JB |
1164 | unbind_to (c.pdlcount, Qnil); |
1165 | return val; | |
1166 | } | |
1167 | c.next = catchlist; | |
1168 | catchlist = &c; | |
db9f0278 | 1169 | |
82da7701 JB |
1170 | h.var = var; |
1171 | h.handler = handlers; | |
db9f0278 | 1172 | h.next = handlerlist; |
db9f0278 JB |
1173 | h.tag = &c; |
1174 | handlerlist = &h; | |
1175 | ||
82da7701 | 1176 | val = Feval (bodyform); |
db9f0278 JB |
1177 | catchlist = c.next; |
1178 | handlerlist = h.next; | |
1179 | return val; | |
1180 | } | |
1181 | ||
f029ca5f RS |
1182 | /* Call the function BFUN with no arguments, catching errors within it |
1183 | according to HANDLERS. If there is an error, call HFUN with | |
1184 | one argument which is the data that describes the error: | |
1185 | (SIGNALNAME . DATA) | |
1186 | ||
1187 | HANDLERS can be a list of conditions to catch. | |
1188 | If HANDLERS is Qt, catch all errors. | |
1189 | If HANDLERS is Qerror, catch all errors | |
1190 | but allow the debugger to run if that is enabled. */ | |
1191 | ||
db9f0278 JB |
1192 | Lisp_Object |
1193 | internal_condition_case (bfun, handlers, hfun) | |
1194 | Lisp_Object (*bfun) (); | |
1195 | Lisp_Object handlers; | |
1196 | Lisp_Object (*hfun) (); | |
1197 | { | |
1198 | Lisp_Object val; | |
1199 | struct catchtag c; | |
1200 | struct handler h; | |
1201 | ||
dccfb979 AI |
1202 | #if 0 /* Can't do this check anymore because realize_basic_faces has |
1203 | to BLOCK_INPUT, and can call Lisp. What's really needed is a | |
1204 | flag indicating that we're currently handling a signal. */ | |
01591d17 RS |
1205 | /* Since Fsignal resets this to 0, it had better be 0 now |
1206 | or else we have a potential bug. */ | |
1207 | if (interrupt_input_blocked != 0) | |
1208 | abort (); | |
dccfb979 | 1209 | #endif |
01591d17 | 1210 | |
db9f0278 JB |
1211 | c.tag = Qnil; |
1212 | c.val = Qnil; | |
1213 | c.backlist = backtrace_list; | |
1214 | c.handlerlist = handlerlist; | |
1215 | c.lisp_eval_depth = lisp_eval_depth; | |
1216 | c.pdlcount = specpdl_ptr - specpdl; | |
1217 | c.poll_suppress_count = poll_suppress_count; | |
1218 | c.gcpro = gcprolist; | |
bcf28080 | 1219 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1220 | if (_setjmp (c.jmp)) |
1221 | { | |
9d58218c | 1222 | return (*hfun) (c.val); |
db9f0278 JB |
1223 | } |
1224 | c.next = catchlist; | |
1225 | catchlist = &c; | |
1226 | h.handler = handlers; | |
1227 | h.var = Qnil; | |
db9f0278 JB |
1228 | h.next = handlerlist; |
1229 | h.tag = &c; | |
1230 | handlerlist = &h; | |
1231 | ||
1232 | val = (*bfun) (); | |
1233 | catchlist = c.next; | |
1234 | handlerlist = h.next; | |
1235 | return val; | |
1236 | } | |
1237 | ||
f029ca5f RS |
1238 | /* Like internal_condition_case but call HFUN with ARG as its argument. */ |
1239 | ||
d227775c RS |
1240 | Lisp_Object |
1241 | internal_condition_case_1 (bfun, arg, handlers, hfun) | |
1242 | Lisp_Object (*bfun) (); | |
1243 | Lisp_Object arg; | |
1244 | Lisp_Object handlers; | |
1245 | Lisp_Object (*hfun) (); | |
1246 | { | |
1247 | Lisp_Object val; | |
1248 | struct catchtag c; | |
1249 | struct handler h; | |
1250 | ||
1251 | c.tag = Qnil; | |
1252 | c.val = Qnil; | |
1253 | c.backlist = backtrace_list; | |
1254 | c.handlerlist = handlerlist; | |
1255 | c.lisp_eval_depth = lisp_eval_depth; | |
1256 | c.pdlcount = specpdl_ptr - specpdl; | |
1257 | c.poll_suppress_count = poll_suppress_count; | |
1258 | c.gcpro = gcprolist; | |
bcf28080 | 1259 | c.byte_stack = byte_stack_list; |
d227775c RS |
1260 | if (_setjmp (c.jmp)) |
1261 | { | |
9d58218c | 1262 | return (*hfun) (c.val); |
d227775c RS |
1263 | } |
1264 | c.next = catchlist; | |
1265 | catchlist = &c; | |
1266 | h.handler = handlers; | |
1267 | h.var = Qnil; | |
1268 | h.next = handlerlist; | |
1269 | h.tag = &c; | |
1270 | handlerlist = &h; | |
1271 | ||
1272 | val = (*bfun) (arg); | |
1273 | catchlist = c.next; | |
1274 | handlerlist = h.next; | |
1275 | return val; | |
1276 | } | |
10b29d41 GM |
1277 | |
1278 | ||
1279 | /* Like internal_condition_case but call HFUN with NARGS as first, | |
1280 | and ARGS as second argument. */ | |
1281 | ||
1282 | Lisp_Object | |
1283 | internal_condition_case_2 (bfun, nargs, args, handlers, hfun) | |
1284 | Lisp_Object (*bfun) (); | |
1285 | int nargs; | |
1286 | Lisp_Object *args; | |
1287 | Lisp_Object handlers; | |
1288 | Lisp_Object (*hfun) (); | |
1289 | { | |
1290 | Lisp_Object val; | |
1291 | struct catchtag c; | |
1292 | struct handler h; | |
1293 | ||
1294 | c.tag = Qnil; | |
1295 | c.val = Qnil; | |
1296 | c.backlist = backtrace_list; | |
1297 | c.handlerlist = handlerlist; | |
1298 | c.lisp_eval_depth = lisp_eval_depth; | |
1299 | c.pdlcount = specpdl_ptr - specpdl; | |
1300 | c.poll_suppress_count = poll_suppress_count; | |
1301 | c.gcpro = gcprolist; | |
1302 | c.byte_stack = byte_stack_list; | |
1303 | if (_setjmp (c.jmp)) | |
1304 | { | |
1305 | return (*hfun) (c.val); | |
1306 | } | |
1307 | c.next = catchlist; | |
1308 | catchlist = &c; | |
1309 | h.handler = handlers; | |
1310 | h.var = Qnil; | |
1311 | h.next = handlerlist; | |
1312 | h.tag = &c; | |
1313 | handlerlist = &h; | |
1314 | ||
1315 | val = (*bfun) (nargs, args); | |
1316 | catchlist = c.next; | |
1317 | handlerlist = h.next; | |
1318 | return val; | |
1319 | } | |
1320 | ||
d227775c | 1321 | \f |
db9f0278 JB |
1322 | static Lisp_Object find_handler_clause (); |
1323 | ||
1324 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
4200e719 | 1325 | "Signal an error. Args are ERROR-SYMBOL and associated DATA.\n\ |
db9f0278 | 1326 | This function does not return.\n\n\ |
4200e719 | 1327 | An error symbol is a symbol with an `error-conditions' property\n\ |
db9f0278 JB |
1328 | that is a list of condition names.\n\ |
1329 | A handler for any of those names will get to handle this signal.\n\ | |
1330 | The symbol `error' should normally be one of them.\n\ | |
1331 | \n\ | |
1332 | DATA should be a list. Its elements are printed as part of the error message.\n\ | |
1333 | If the signal is handled, DATA is made available to the handler.\n\ | |
1334 | See also the function `condition-case'.") | |
4200e719 RS |
1335 | (error_symbol, data) |
1336 | Lisp_Object error_symbol, data; | |
db9f0278 | 1337 | { |
bfa8ca43 AS |
1338 | /* When memory is full, ERROR-SYMBOL is nil, |
1339 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). */ | |
db9f0278 JB |
1340 | register struct handler *allhandlers = handlerlist; |
1341 | Lisp_Object conditions; | |
1342 | extern int gc_in_progress; | |
1343 | extern int waiting_for_input; | |
1344 | Lisp_Object debugger_value; | |
c11d3d17 | 1345 | Lisp_Object string; |
1ea9dec4 | 1346 | Lisp_Object real_error_symbol; |
48f8dfa3 | 1347 | extern int display_busy_cursor_p; |
a2ff3819 | 1348 | struct backtrace *bp; |
db9f0278 | 1349 | |
db9f0278 JB |
1350 | immediate_quit = 0; |
1351 | if (gc_in_progress || waiting_for_input) | |
1352 | abort (); | |
1353 | ||
1354 | TOTALLY_UNBLOCK_INPUT; | |
1355 | ||
1ea9dec4 RS |
1356 | if (NILP (error_symbol)) |
1357 | real_error_symbol = Fcar (data); | |
1358 | else | |
1359 | real_error_symbol = error_symbol; | |
1360 | ||
48f8dfa3 GM |
1361 | #ifdef HAVE_X_WINDOWS |
1362 | if (display_busy_cursor_p) | |
d67235d8 | 1363 | cancel_busy_cursor (); |
48f8dfa3 | 1364 | #endif |
48f8dfa3 | 1365 | |
61ede770 RS |
1366 | /* This hook is used by edebug. */ |
1367 | if (! NILP (Vsignal_hook_function)) | |
f01a9c5b | 1368 | call2 (Vsignal_hook_function, error_symbol, data); |
61ede770 | 1369 | |
1ea9dec4 | 1370 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1371 | |
a2ff3819 GM |
1372 | /* Remember from where signal was called. Skip over the frame for |
1373 | `signal' itself. If a frame for `error' follows, skip that, | |
1374 | too. */ | |
090a072f GM |
1375 | Vsignaling_function = Qnil; |
1376 | if (backtrace_list) | |
1377 | { | |
1378 | bp = backtrace_list->next; | |
1379 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1380 | bp = bp->next; | |
1381 | if (bp && bp->function) | |
1382 | Vsignaling_function = *bp->function; | |
1383 | } | |
a2ff3819 | 1384 | |
db9f0278 JB |
1385 | for (; handlerlist; handlerlist = handlerlist->next) |
1386 | { | |
1387 | register Lisp_Object clause; | |
8515044c GM |
1388 | |
1389 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1390 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1391 | ||
1392 | if (specpdl_size + 40 > max_specpdl_size) | |
1393 | max_specpdl_size = specpdl_size + 40; | |
1394 | ||
db9f0278 | 1395 | clause = find_handler_clause (handlerlist->handler, conditions, |
4200e719 | 1396 | error_symbol, data, &debugger_value); |
db9f0278 JB |
1397 | |
1398 | #if 0 /* Most callers are not prepared to handle gc if this returns. | |
1399 | So, since this feature is not very useful, take it out. */ | |
1400 | /* If have called debugger and user wants to continue, | |
1401 | just return nil. */ | |
1402 | if (EQ (clause, Qlambda)) | |
1403 | return debugger_value; | |
1404 | #else | |
1405 | if (EQ (clause, Qlambda)) | |
82da7701 | 1406 | { |
690337b7 KH |
1407 | /* We can't return values to code which signaled an error, but we |
1408 | can continue code which has signaled a quit. */ | |
1ea9dec4 | 1409 | if (EQ (real_error_symbol, Qquit)) |
82da7701 JB |
1410 | return Qnil; |
1411 | else | |
d3e6f8be | 1412 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1413 | } |
db9f0278 JB |
1414 | #endif |
1415 | ||
265a9e55 | 1416 | if (!NILP (clause)) |
db9f0278 | 1417 | { |
9d58218c | 1418 | Lisp_Object unwind_data; |
db9f0278 | 1419 | struct handler *h = handlerlist; |
9d58218c | 1420 | |
db9f0278 | 1421 | handlerlist = allhandlers; |
1ea9dec4 RS |
1422 | |
1423 | if (NILP (error_symbol)) | |
1424 | unwind_data = data; | |
9d58218c RS |
1425 | else |
1426 | unwind_data = Fcons (error_symbol, data); | |
1427 | h->chosen_clause = clause; | |
1428 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1429 | } |
1430 | } | |
1431 | ||
1432 | handlerlist = allhandlers; | |
1433 | /* If no handler is present now, try to run the debugger, | |
1434 | and if that fails, throw to top level. */ | |
4200e719 | 1435 | find_handler_clause (Qerror, conditions, error_symbol, data, &debugger_value); |
c11d3d17 RS |
1436 | if (catchlist != 0) |
1437 | Fthrow (Qtop_level, Qt); | |
1438 | ||
1ea9dec4 | 1439 | if (! NILP (error_symbol)) |
c11d3d17 RS |
1440 | data = Fcons (error_symbol, data); |
1441 | ||
1442 | string = Ferror_message_string (data); | |
377127ce | 1443 | fatal ("%s", XSTRING (string)->data, 0); |
db9f0278 JB |
1444 | } |
1445 | ||
128c0f66 RM |
1446 | /* Return nonzero iff LIST is a non-nil atom or |
1447 | a list containing one of CONDITIONS. */ | |
1448 | ||
1449 | static int | |
1450 | wants_debugger (list, conditions) | |
1451 | Lisp_Object list, conditions; | |
1452 | { | |
4de86b16 | 1453 | if (NILP (list)) |
128c0f66 RM |
1454 | return 0; |
1455 | if (! CONSP (list)) | |
1456 | return 1; | |
1457 | ||
ab67260b | 1458 | while (CONSP (conditions)) |
128c0f66 | 1459 | { |
ab67260b | 1460 | Lisp_Object this, tail; |
03699b14 KR |
1461 | this = XCAR (conditions); |
1462 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1463 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1464 | return 1; |
03699b14 | 1465 | conditions = XCDR (conditions); |
128c0f66 | 1466 | } |
ab67260b | 1467 | return 0; |
128c0f66 RM |
1468 | } |
1469 | ||
fc950e09 KH |
1470 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1471 | and described by SIGNAL-DATA, should skip the debugger | |
1472 | according to debugger-ignore-errors. */ | |
1473 | ||
1474 | static int | |
1475 | skip_debugger (conditions, data) | |
1476 | Lisp_Object conditions, data; | |
1477 | { | |
1478 | Lisp_Object tail; | |
1479 | int first_string = 1; | |
1480 | Lisp_Object error_message; | |
1481 | ||
1482 | for (tail = Vdebug_ignored_errors; CONSP (tail); | |
03699b14 | 1483 | tail = XCDR (tail)) |
fc950e09 | 1484 | { |
03699b14 | 1485 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1486 | { |
1487 | if (first_string) | |
1488 | { | |
1489 | error_message = Ferror_message_string (data); | |
1490 | first_string = 0; | |
1491 | } | |
03699b14 | 1492 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1493 | return 1; |
1494 | } | |
1495 | else | |
1496 | { | |
1497 | Lisp_Object contail; | |
1498 | ||
1499 | for (contail = conditions; CONSP (contail); | |
03699b14 KR |
1500 | contail = XCDR (contail)) |
1501 | if (EQ (XCAR (tail), XCAR (contail))) | |
fc950e09 KH |
1502 | return 1; |
1503 | } | |
1504 | } | |
1505 | ||
1506 | return 0; | |
1507 | } | |
1508 | ||
128c0f66 | 1509 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1510 | There are two ways to pass SIG and DATA: |
9b942ebd | 1511 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1512 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1513 | This is for memory-full errors only. |
1ea9dec4 | 1514 | |
128c0f66 | 1515 | Store value returned from debugger into *DEBUGGER_VALUE_PTR. */ |
db9f0278 JB |
1516 | |
1517 | static Lisp_Object | |
1518 | find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr) | |
1519 | Lisp_Object handlers, conditions, sig, data; | |
1520 | Lisp_Object *debugger_value_ptr; | |
1521 | { | |
1522 | register Lisp_Object h; | |
1523 | register Lisp_Object tem; | |
db9f0278 JB |
1524 | |
1525 | if (EQ (handlers, Qt)) /* t is used by handlers for all conditions, set up by C code. */ | |
1526 | return Qt; | |
61ede770 RS |
1527 | /* error is used similarly, but means print an error message |
1528 | and run the debugger if that is enabled. */ | |
1529 | if (EQ (handlers, Qerror) | |
57a6e758 RS |
1530 | || !NILP (Vdebug_on_signal)) /* This says call debugger even if |
1531 | there is a handler. */ | |
db9f0278 | 1532 | { |
61ede770 RS |
1533 | int count = specpdl_ptr - specpdl; |
1534 | int debugger_called = 0; | |
1ea9dec4 | 1535 | Lisp_Object sig_symbol, combined_data; |
9b942ebd RS |
1536 | /* This is set to 1 if we are handling a memory-full error, |
1537 | because these must not run the debugger. | |
1538 | (There is no room in memory to do that!) */ | |
1539 | int no_debugger = 0; | |
1ea9dec4 RS |
1540 | |
1541 | if (NILP (sig)) | |
1542 | { | |
1543 | combined_data = data; | |
1544 | sig_symbol = Fcar (data); | |
9b942ebd | 1545 | no_debugger = 1; |
1ea9dec4 RS |
1546 | } |
1547 | else | |
1548 | { | |
1549 | combined_data = Fcons (sig, data); | |
1550 | sig_symbol = sig; | |
1551 | } | |
61ede770 | 1552 | |
128c0f66 | 1553 | if (wants_debugger (Vstack_trace_on_error, conditions)) |
88817f3b | 1554 | { |
b369fa65 | 1555 | #ifdef PROTOTYPES |
88817f3b RS |
1556 | internal_with_output_to_temp_buffer ("*Backtrace*", |
1557 | (Lisp_Object (*) (Lisp_Object)) Fbacktrace, | |
1558 | Qnil); | |
1559 | #else | |
1560 | internal_with_output_to_temp_buffer ("*Backtrace*", | |
1561 | Fbacktrace, Qnil); | |
1562 | #endif | |
1563 | } | |
9b942ebd RS |
1564 | if (! no_debugger |
1565 | && (EQ (sig_symbol, Qquit) | |
1566 | ? debug_on_quit | |
1567 | : wants_debugger (Vdebug_on_error, conditions)) | |
1ea9dec4 | 1568 | && ! skip_debugger (conditions, combined_data) |
be857679 | 1569 | && when_entered_debugger < num_nonmacro_input_events) |
db9f0278 | 1570 | { |
db9f0278 | 1571 | specbind (Qdebug_on_error, Qnil); |
fc950e09 KH |
1572 | *debugger_value_ptr |
1573 | = call_debugger (Fcons (Qerror, | |
1ea9dec4 | 1574 | Fcons (combined_data, Qnil))); |
61ede770 RS |
1575 | debugger_called = 1; |
1576 | } | |
1577 | /* If there is no handler, return saying whether we ran the debugger. */ | |
1578 | if (EQ (handlers, Qerror)) | |
1579 | { | |
1580 | if (debugger_called) | |
1581 | return unbind_to (count, Qlambda); | |
1582 | return Qt; | |
db9f0278 | 1583 | } |
db9f0278 JB |
1584 | } |
1585 | for (h = handlers; CONSP (h); h = Fcdr (h)) | |
1586 | { | |
5f96776a RS |
1587 | Lisp_Object handler, condit; |
1588 | ||
1589 | handler = Fcar (h); | |
1590 | if (!CONSP (handler)) | |
db9f0278 | 1591 | continue; |
5f96776a RS |
1592 | condit = Fcar (handler); |
1593 | /* Handle a single condition name in handler HANDLER. */ | |
1594 | if (SYMBOLP (condit)) | |
1595 | { | |
1596 | tem = Fmemq (Fcar (handler), conditions); | |
1597 | if (!NILP (tem)) | |
1598 | return handler; | |
1599 | } | |
1600 | /* Handle a list of condition names in handler HANDLER. */ | |
1601 | else if (CONSP (condit)) | |
1602 | { | |
1603 | while (CONSP (condit)) | |
1604 | { | |
1605 | tem = Fmemq (Fcar (condit), conditions); | |
1606 | if (!NILP (tem)) | |
1607 | return handler; | |
03699b14 | 1608 | condit = XCDR (condit); |
5f96776a RS |
1609 | } |
1610 | } | |
db9f0278 JB |
1611 | } |
1612 | return Qnil; | |
1613 | } | |
1614 | ||
1615 | /* dump an error message; called like printf */ | |
1616 | ||
1617 | /* VARARGS 1 */ | |
1618 | void | |
1619 | error (m, a1, a2, a3) | |
1620 | char *m; | |
9125da08 | 1621 | char *a1, *a2, *a3; |
db9f0278 JB |
1622 | { |
1623 | char buf[200]; | |
9125da08 RS |
1624 | int size = 200; |
1625 | int mlen; | |
1626 | char *buffer = buf; | |
1627 | char *args[3]; | |
1628 | int allocated = 0; | |
1629 | Lisp_Object string; | |
1630 | ||
1631 | args[0] = a1; | |
1632 | args[1] = a2; | |
1633 | args[2] = a3; | |
1634 | ||
1635 | mlen = strlen (m); | |
db9f0278 JB |
1636 | |
1637 | while (1) | |
9125da08 | 1638 | { |
955f3ff9 | 1639 | int used = doprnt (buffer, size, m, m + mlen, 3, args); |
9125da08 RS |
1640 | if (used < size) |
1641 | break; | |
1642 | size *= 2; | |
1643 | if (allocated) | |
1644 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
1645 | else |
1646 | { | |
1647 | buffer = (char *) xmalloc (size); | |
1648 | allocated = 1; | |
1649 | } | |
9125da08 RS |
1650 | } |
1651 | ||
955f3ff9 | 1652 | string = build_string (buffer); |
9125da08 | 1653 | if (allocated) |
9ae6734f | 1654 | xfree (buffer); |
9125da08 RS |
1655 | |
1656 | Fsignal (Qerror, Fcons (string, Qnil)); | |
db9f0278 JB |
1657 | } |
1658 | \f | |
1659 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 1, 0, | |
1660 | "T if FUNCTION makes provisions for interactive calling.\n\ | |
1661 | This means it contains a description for how to read arguments to give it.\n\ | |
1662 | The value is nil for an invalid function or a symbol with no function\n\ | |
1663 | definition.\n\ | |
1664 | \n\ | |
1665 | Interactively callable functions include strings and vectors (treated\n\ | |
1666 | as keyboard macros), lambda-expressions that contain a top-level call\n\ | |
1667 | to `interactive', autoload definitions made by `autoload' with non-nil\n\ | |
1668 | fourth argument, and some of the built-in functions of Lisp.\n\ | |
1669 | \n\ | |
1670 | Also, a symbol satisfies `commandp' if its function definition does so.") | |
1671 | (function) | |
1672 | Lisp_Object function; | |
1673 | { | |
1674 | register Lisp_Object fun; | |
1675 | register Lisp_Object funcar; | |
db9f0278 JB |
1676 | |
1677 | fun = function; | |
1678 | ||
ffd56f97 JB |
1679 | fun = indirect_function (fun); |
1680 | if (EQ (fun, Qunbound)) | |
1681 | return Qnil; | |
db9f0278 JB |
1682 | |
1683 | /* Emacs primitives are interactive if their DEFUN specifies an | |
1684 | interactive spec. */ | |
90165123 | 1685 | if (SUBRP (fun)) |
db9f0278 JB |
1686 | { |
1687 | if (XSUBR (fun)->prompt) | |
1688 | return Qt; | |
1689 | else | |
1690 | return Qnil; | |
1691 | } | |
1692 | ||
1693 | /* Bytecode objects are interactive if they are long enough to | |
1694 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1695 | where the interactive spec is stored. */ | |
90165123 | 1696 | else if (COMPILEDP (fun)) |
f9b4aacf | 1697 | return ((XVECTOR (fun)->size & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
db9f0278 JB |
1698 | ? Qt : Qnil); |
1699 | ||
1700 | /* Strings and vectors are keyboard macros. */ | |
90165123 | 1701 | if (STRINGP (fun) || VECTORP (fun)) |
db9f0278 JB |
1702 | return Qt; |
1703 | ||
1704 | /* Lists may represent commands. */ | |
1705 | if (!CONSP (fun)) | |
1706 | return Qnil; | |
1707 | funcar = Fcar (fun); | |
90165123 | 1708 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
1709 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
1710 | if (EQ (funcar, Qlambda)) | |
1711 | return Fassq (Qinteractive, Fcdr (Fcdr (fun))); | |
1712 | if (EQ (funcar, Qmocklisp)) | |
1713 | return Qt; /* All mocklisp functions can be called interactively */ | |
1714 | if (EQ (funcar, Qautoload)) | |
1715 | return Fcar (Fcdr (Fcdr (Fcdr (fun)))); | |
1716 | else | |
1717 | return Qnil; | |
1718 | } | |
1719 | ||
1720 | /* ARGSUSED */ | |
1721 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, | |
1722 | "Define FUNCTION to autoload from FILE.\n\ | |
1723 | FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\ | |
1724 | Third arg DOCSTRING is documentation for the function.\n\ | |
1725 | Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\ | |
ee9ee63c JB |
1726 | Fifth arg TYPE indicates the type of the object:\n\ |
1727 | nil or omitted says FUNCTION is a function,\n\ | |
1728 | `keymap' says FUNCTION is really a keymap, and\n\ | |
1729 | `macro' or t says FUNCTION is really a macro.\n\ | |
db9f0278 JB |
1730 | Third through fifth args give info about the real definition.\n\ |
1731 | They default to nil.\n\ | |
1732 | If FUNCTION is already defined other than as an autoload,\n\ | |
1733 | this does nothing and returns nil.") | |
ee9ee63c JB |
1734 | (function, file, docstring, interactive, type) |
1735 | Lisp_Object function, file, docstring, interactive, type; | |
db9f0278 JB |
1736 | { |
1737 | #ifdef NO_ARG_ARRAY | |
1738 | Lisp_Object args[4]; | |
1739 | #endif | |
1740 | ||
1741 | CHECK_SYMBOL (function, 0); | |
1742 | CHECK_STRING (file, 1); | |
1743 | ||
1744 | /* If function is defined and not as an autoload, don't override */ | |
1745 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 1746 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 1747 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
1748 | return Qnil; |
1749 | ||
7973e637 SM |
1750 | if (NILP (Vpurify_flag)) |
1751 | /* Only add entries after dumping, because the ones before are | |
1752 | not useful and else we get loads of them from the loaddefs.el. */ | |
1753 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
1754 | ||
db9f0278 JB |
1755 | #ifdef NO_ARG_ARRAY |
1756 | args[0] = file; | |
1757 | args[1] = docstring; | |
1758 | args[2] = interactive; | |
ee9ee63c | 1759 | args[3] = type; |
db9f0278 JB |
1760 | |
1761 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); | |
1762 | #else /* NO_ARG_ARRAY */ | |
1763 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); | |
1764 | #endif /* not NO_ARG_ARRAY */ | |
1765 | } | |
1766 | ||
1767 | Lisp_Object | |
1768 | un_autoload (oldqueue) | |
1769 | Lisp_Object oldqueue; | |
1770 | { | |
1771 | register Lisp_Object queue, first, second; | |
1772 | ||
1773 | /* Queue to unwind is current value of Vautoload_queue. | |
1774 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1775 | queue = Vautoload_queue; | |
1776 | Vautoload_queue = oldqueue; | |
1777 | while (CONSP (queue)) | |
1778 | { | |
1779 | first = Fcar (queue); | |
1780 | second = Fcdr (first); | |
1781 | first = Fcar (first); | |
1782 | if (EQ (second, Qnil)) | |
1783 | Vfeatures = first; | |
1784 | else | |
1785 | Ffset (first, second); | |
1786 | queue = Fcdr (queue); | |
1787 | } | |
1788 | return Qnil; | |
1789 | } | |
1790 | ||
ca20916b RS |
1791 | /* Load an autoloaded function. |
1792 | FUNNAME is the symbol which is the function's name. | |
1793 | FUNDEF is the autoload definition (a list). */ | |
1794 | ||
045ba794 | 1795 | void |
db9f0278 JB |
1796 | do_autoload (fundef, funname) |
1797 | Lisp_Object fundef, funname; | |
1798 | { | |
1799 | int count = specpdl_ptr - specpdl; | |
cb81ac97 | 1800 | Lisp_Object fun, queue, first, second; |
ca20916b | 1801 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 JB |
1802 | |
1803 | fun = funname; | |
1804 | CHECK_SYMBOL (funname, 0); | |
ca20916b | 1805 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 1806 | |
f87740dc RS |
1807 | /* Preserve the match data. */ |
1808 | record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil)); | |
1809 | ||
1810 | /* Value saved here is to be restored into Vautoload_queue. */ | |
db9f0278 JB |
1811 | record_unwind_protect (un_autoload, Vautoload_queue); |
1812 | Vautoload_queue = Qt; | |
4aac2302 | 1813 | Fload (Fcar (Fcdr (fundef)), Qnil, noninteractive ? Qt : Qnil, Qnil, Qt); |
2a49b6e5 | 1814 | |
f87740dc | 1815 | /* Save the old autoloads, in case we ever do an unload. */ |
2a49b6e5 RS |
1816 | queue = Vautoload_queue; |
1817 | while (CONSP (queue)) | |
1818 | { | |
1819 | first = Fcar (queue); | |
1820 | second = Fcdr (first); | |
1821 | first = Fcar (first); | |
5739ce6b ER |
1822 | |
1823 | /* Note: This test is subtle. The cdr of an autoload-queue entry | |
1824 | may be an atom if the autoload entry was generated by a defalias | |
f87740dc | 1825 | or fset. */ |
5739ce6b | 1826 | if (CONSP (second)) |
03e267c2 | 1827 | Fput (first, Qautoload, (Fcdr (second))); |
5739ce6b | 1828 | |
2a49b6e5 RS |
1829 | queue = Fcdr (queue); |
1830 | } | |
1831 | ||
db9f0278 JB |
1832 | /* Once loading finishes, don't undo it. */ |
1833 | Vautoload_queue = Qt; | |
1834 | unbind_to (count, Qnil); | |
1835 | ||
ffd56f97 JB |
1836 | fun = Findirect_function (fun); |
1837 | ||
76c2b0cc | 1838 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 JB |
1839 | error ("Autoloading failed to define function %s", |
1840 | XSYMBOL (funname)->name->data); | |
ca20916b | 1841 | UNGCPRO; |
db9f0278 | 1842 | } |
4c576a83 | 1843 | |
db9f0278 JB |
1844 | \f |
1845 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
1846 | "Evaluate FORM and return its value.") | |
1847 | (form) | |
1848 | Lisp_Object form; | |
1849 | { | |
1850 | Lisp_Object fun, val, original_fun, original_args; | |
1851 | Lisp_Object funcar; | |
1852 | struct backtrace backtrace; | |
1853 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1854 | ||
4c576a83 | 1855 | if (handling_signal) |
48f8dfa3 GM |
1856 | abort (); |
1857 | ||
90165123 | 1858 | if (SYMBOLP (form)) |
db9f0278 JB |
1859 | { |
1860 | if (EQ (Vmocklisp_arguments, Qt)) | |
1861 | return Fsymbol_value (form); | |
1862 | val = Fsymbol_value (form); | |
265a9e55 | 1863 | if (NILP (val)) |
a631e24c | 1864 | XSETFASTINT (val, 0); |
db9f0278 | 1865 | else if (EQ (val, Qt)) |
a631e24c | 1866 | XSETFASTINT (val, 1); |
db9f0278 JB |
1867 | return val; |
1868 | } | |
1869 | if (!CONSP (form)) | |
1870 | return form; | |
1871 | ||
1872 | QUIT; | |
1873 | if (consing_since_gc > gc_cons_threshold) | |
1874 | { | |
1875 | GCPRO1 (form); | |
1876 | Fgarbage_collect (); | |
1877 | UNGCPRO; | |
1878 | } | |
1879 | ||
1880 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1881 | { | |
1882 | if (max_lisp_eval_depth < 100) | |
1883 | max_lisp_eval_depth = 100; | |
1884 | if (lisp_eval_depth > max_lisp_eval_depth) | |
1885 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
1886 | } | |
1887 | ||
1888 | original_fun = Fcar (form); | |
1889 | original_args = Fcdr (form); | |
1890 | ||
1891 | backtrace.next = backtrace_list; | |
1892 | backtrace_list = &backtrace; | |
1893 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
1894 | backtrace.args = &original_args; | |
1895 | backtrace.nargs = UNEVALLED; | |
1896 | backtrace.evalargs = 1; | |
1897 | backtrace.debug_on_exit = 0; | |
1898 | ||
1899 | if (debug_on_next_call) | |
1900 | do_debug_on_call (Qt); | |
1901 | ||
1902 | /* At this point, only original_fun and original_args | |
1903 | have values that will be used below */ | |
1904 | retry: | |
ffd56f97 | 1905 | fun = Findirect_function (original_fun); |
db9f0278 | 1906 | |
90165123 | 1907 | if (SUBRP (fun)) |
db9f0278 JB |
1908 | { |
1909 | Lisp_Object numargs; | |
166c822d | 1910 | Lisp_Object argvals[8]; |
db9f0278 JB |
1911 | Lisp_Object args_left; |
1912 | register int i, maxargs; | |
1913 | ||
1914 | args_left = original_args; | |
1915 | numargs = Flength (args_left); | |
1916 | ||
1917 | if (XINT (numargs) < XSUBR (fun)->min_args || | |
1918 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
1919 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
1920 | ||
1921 | if (XSUBR (fun)->max_args == UNEVALLED) | |
1922 | { | |
1923 | backtrace.evalargs = 0; | |
1924 | val = (*XSUBR (fun)->function) (args_left); | |
1925 | goto done; | |
1926 | } | |
1927 | ||
1928 | if (XSUBR (fun)->max_args == MANY) | |
1929 | { | |
1930 | /* Pass a vector of evaluated arguments */ | |
1931 | Lisp_Object *vals; | |
1932 | register int argnum = 0; | |
1933 | ||
1934 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
1935 | ||
1936 | GCPRO3 (args_left, fun, fun); | |
1937 | gcpro3.var = vals; | |
1938 | gcpro3.nvars = 0; | |
1939 | ||
265a9e55 | 1940 | while (!NILP (args_left)) |
db9f0278 JB |
1941 | { |
1942 | vals[argnum++] = Feval (Fcar (args_left)); | |
1943 | args_left = Fcdr (args_left); | |
1944 | gcpro3.nvars = argnum; | |
1945 | } | |
db9f0278 JB |
1946 | |
1947 | backtrace.args = vals; | |
1948 | backtrace.nargs = XINT (numargs); | |
1949 | ||
1950 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 1951 | UNGCPRO; |
db9f0278 JB |
1952 | goto done; |
1953 | } | |
1954 | ||
1955 | GCPRO3 (args_left, fun, fun); | |
1956 | gcpro3.var = argvals; | |
1957 | gcpro3.nvars = 0; | |
1958 | ||
1959 | maxargs = XSUBR (fun)->max_args; | |
1960 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
1961 | { | |
1962 | argvals[i] = Feval (Fcar (args_left)); | |
1963 | gcpro3.nvars = ++i; | |
1964 | } | |
1965 | ||
1966 | UNGCPRO; | |
1967 | ||
1968 | backtrace.args = argvals; | |
1969 | backtrace.nargs = XINT (numargs); | |
1970 | ||
1971 | switch (i) | |
1972 | { | |
1973 | case 0: | |
1974 | val = (*XSUBR (fun)->function) (); | |
1975 | goto done; | |
1976 | case 1: | |
1977 | val = (*XSUBR (fun)->function) (argvals[0]); | |
1978 | goto done; | |
1979 | case 2: | |
1980 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
1981 | goto done; | |
1982 | case 3: | |
1983 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1984 | argvals[2]); | |
1985 | goto done; | |
1986 | case 4: | |
1987 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1988 | argvals[2], argvals[3]); | |
1989 | goto done; | |
1990 | case 5: | |
1991 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1992 | argvals[3], argvals[4]); | |
1993 | goto done; | |
1994 | case 6: | |
1995 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1996 | argvals[3], argvals[4], argvals[5]); | |
1997 | goto done; | |
15c65264 RS |
1998 | case 7: |
1999 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2000 | argvals[3], argvals[4], argvals[5], | |
2001 | argvals[6]); | |
2002 | goto done; | |
db9f0278 | 2003 | |
166c822d KH |
2004 | case 8: |
2005 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2006 | argvals[3], argvals[4], argvals[5], | |
2007 | argvals[6], argvals[7]); | |
2008 | goto done; | |
2009 | ||
db9f0278 | 2010 | default: |
08564963 JB |
2011 | /* Someone has created a subr that takes more arguments than |
2012 | is supported by this code. We need to either rewrite the | |
2013 | subr to use a different argument protocol, or add more | |
2014 | cases to this switch. */ | |
2015 | abort (); | |
db9f0278 JB |
2016 | } |
2017 | } | |
90165123 | 2018 | if (COMPILEDP (fun)) |
db9f0278 JB |
2019 | val = apply_lambda (fun, original_args, 1); |
2020 | else | |
2021 | { | |
2022 | if (!CONSP (fun)) | |
2023 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2024 | funcar = Fcar (fun); | |
90165123 | 2025 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
2026 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
2027 | if (EQ (funcar, Qautoload)) | |
2028 | { | |
2029 | do_autoload (fun, original_fun); | |
2030 | goto retry; | |
2031 | } | |
2032 | if (EQ (funcar, Qmacro)) | |
2033 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
2034 | else if (EQ (funcar, Qlambda)) | |
2035 | val = apply_lambda (fun, original_args, 1); | |
2036 | else if (EQ (funcar, Qmocklisp)) | |
2037 | val = ml_apply (fun, original_args); | |
2038 | else | |
2039 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2040 | } | |
2041 | done: | |
2042 | if (!EQ (Vmocklisp_arguments, Qt)) | |
2043 | { | |
265a9e55 | 2044 | if (NILP (val)) |
a631e24c | 2045 | XSETFASTINT (val, 0); |
db9f0278 | 2046 | else if (EQ (val, Qt)) |
a631e24c | 2047 | XSETFASTINT (val, 1); |
db9f0278 JB |
2048 | } |
2049 | lisp_eval_depth--; | |
2050 | if (backtrace.debug_on_exit) | |
2051 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2052 | backtrace_list = backtrace.next; | |
2053 | return val; | |
2054 | } | |
2055 | \f | |
2056 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
2057 | "Call FUNCTION with our remaining args, using our last arg as list of args.\n\ | |
fd7fe9a1 | 2058 | Then return the value FUNCTION returns.\n\ |
db9f0278 JB |
2059 | Thus, (apply '+ 1 2 '(3 4)) returns 10.") |
2060 | (nargs, args) | |
2061 | int nargs; | |
2062 | Lisp_Object *args; | |
2063 | { | |
2064 | register int i, numargs; | |
2065 | register Lisp_Object spread_arg; | |
2066 | register Lisp_Object *funcall_args; | |
db9f0278 | 2067 | Lisp_Object fun; |
a6e3fa71 | 2068 | struct gcpro gcpro1; |
db9f0278 JB |
2069 | |
2070 | fun = args [0]; | |
2071 | funcall_args = 0; | |
2072 | spread_arg = args [nargs - 1]; | |
2073 | CHECK_LIST (spread_arg, nargs); | |
2074 | ||
2075 | numargs = XINT (Flength (spread_arg)); | |
2076 | ||
2077 | if (numargs == 0) | |
2078 | return Ffuncall (nargs - 1, args); | |
2079 | else if (numargs == 1) | |
2080 | { | |
03699b14 | 2081 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2082 | return Ffuncall (nargs, args); |
2083 | } | |
2084 | ||
a6e3fa71 | 2085 | numargs += nargs - 2; |
db9f0278 | 2086 | |
ffd56f97 JB |
2087 | fun = indirect_function (fun); |
2088 | if (EQ (fun, Qunbound)) | |
db9f0278 | 2089 | { |
ffd56f97 JB |
2090 | /* Let funcall get the error */ |
2091 | fun = args[0]; | |
2092 | goto funcall; | |
db9f0278 JB |
2093 | } |
2094 | ||
90165123 | 2095 | if (SUBRP (fun)) |
db9f0278 JB |
2096 | { |
2097 | if (numargs < XSUBR (fun)->min_args | |
2098 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2099 | goto funcall; /* Let funcall get the error */ | |
2100 | else if (XSUBR (fun)->max_args > numargs) | |
2101 | { | |
2102 | /* Avoid making funcall cons up a yet another new vector of arguments | |
2103 | by explicitly supplying nil's for optional values */ | |
2104 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
2105 | * sizeof (Lisp_Object)); | |
2106 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
2107 | funcall_args[++i] = Qnil; | |
a6e3fa71 JB |
2108 | GCPRO1 (*funcall_args); |
2109 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2110 | } |
2111 | } | |
2112 | funcall: | |
2113 | /* We add 1 to numargs because funcall_args includes the | |
2114 | function itself as well as its arguments. */ | |
2115 | if (!funcall_args) | |
a6e3fa71 JB |
2116 | { |
2117 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
2118 | * sizeof (Lisp_Object)); | |
2119 | GCPRO1 (*funcall_args); | |
2120 | gcpro1.nvars = 1 + numargs; | |
2121 | } | |
2122 | ||
db9f0278 JB |
2123 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
2124 | /* Spread the last arg we got. Its first element goes in | |
2125 | the slot that it used to occupy, hence this value of I. */ | |
2126 | i = nargs - 1; | |
265a9e55 | 2127 | while (!NILP (spread_arg)) |
db9f0278 | 2128 | { |
03699b14 KR |
2129 | funcall_args [i++] = XCAR (spread_arg); |
2130 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2131 | } |
a6e3fa71 JB |
2132 | |
2133 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
2134 | } |
2135 | \f | |
ff936e53 SM |
2136 | /* Run hook variables in various ways. */ |
2137 | ||
2138 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
2139 | ||
2140 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 1, MANY, 0, | |
2141 | "Run each hook in HOOKS. Major mode functions use this.\n\ | |
2142 | Each argument should be a symbol, a hook variable.\n\ | |
2143 | These symbols are processed in the order specified.\n\ | |
2144 | If a hook symbol has a non-nil value, that value may be a function\n\ | |
2145 | or a list of functions to be called to run the hook.\n\ | |
2146 | If the value is a function, it is called with no arguments.\n\ | |
2147 | If it is a list, the elements are called, in order, with no arguments.\n\ | |
2148 | \n\ | |
2149 | To make a hook variable buffer-local, use `make-local-hook',\n\ | |
2150 | not `make-local-variable'.") | |
2151 | (nargs, args) | |
2152 | int nargs; | |
2153 | Lisp_Object *args; | |
2154 | { | |
2155 | Lisp_Object hook[1]; | |
2156 | register int i; | |
2157 | ||
2158 | for (i = 0; i < nargs; i++) | |
2159 | { | |
2160 | hook[0] = args[i]; | |
2161 | run_hook_with_args (1, hook, to_completion); | |
2162 | } | |
2163 | ||
2164 | return Qnil; | |
2165 | } | |
2166 | ||
a0d76c27 EN |
2167 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
2168 | Srun_hook_with_args, 1, MANY, 0, | |
b0b667cb KH |
2169 | "Run HOOK with the specified arguments ARGS.\n\ |
2170 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil\n\ | |
2171 | value, that value may be a function or a list of functions to be\n\ | |
2172 | called to run the hook. If the value is a function, it is called with\n\ | |
2173 | the given arguments and its return value is returned. If it is a list\n\ | |
2174 | of functions, those functions are called, in order,\n\ | |
2175 | with the given arguments ARGS.\n\ | |
2176 | It is best not to depend on the value return by `run-hook-with-args',\n\ | |
2177 | as that may change.\n\ | |
2178 | \n\ | |
ff936e53 SM |
2179 | To make a hook variable buffer-local, use `make-local-hook',\n\ |
2180 | not `make-local-variable'.") | |
2181 | (nargs, args) | |
2182 | int nargs; | |
2183 | Lisp_Object *args; | |
2184 | { | |
2185 | return run_hook_with_args (nargs, args, to_completion); | |
2186 | } | |
2187 | ||
a0d76c27 EN |
2188 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
2189 | Srun_hook_with_args_until_success, 1, MANY, 0, | |
ff936e53 SM |
2190 | "Run HOOK with the specified arguments ARGS.\n\ |
2191 | HOOK should be a symbol, a hook variable. Its value should\n\ | |
2192 | be a list of functions. We call those functions, one by one,\n\ | |
2193 | passing arguments ARGS to each of them, until one of them\n\ | |
2194 | returns a non-nil value. Then we return that value.\n\ | |
2195 | If all the functions return nil, we return nil.\n\ | |
2196 | \n\ | |
2197 | To make a hook variable buffer-local, use `make-local-hook',\n\ | |
2198 | not `make-local-variable'.") | |
b0b667cb KH |
2199 | (nargs, args) |
2200 | int nargs; | |
2201 | Lisp_Object *args; | |
2202 | { | |
ff936e53 SM |
2203 | return run_hook_with_args (nargs, args, until_success); |
2204 | } | |
2205 | ||
a0d76c27 EN |
2206 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
2207 | Srun_hook_with_args_until_failure, 1, MANY, 0, | |
ff936e53 SM |
2208 | "Run HOOK with the specified arguments ARGS.\n\ |
2209 | HOOK should be a symbol, a hook variable. Its value should\n\ | |
2210 | be a list of functions. We call those functions, one by one,\n\ | |
2211 | passing arguments ARGS to each of them, until one of them\n\ | |
2212 | returns nil. Then we return nil.\n\ | |
2213 | If all the functions return non-nil, we return non-nil.\n\ | |
2214 | \n\ | |
2215 | To make a hook variable buffer-local, use `make-local-hook',\n\ | |
2216 | not `make-local-variable'.") | |
2217 | (nargs, args) | |
2218 | int nargs; | |
2219 | Lisp_Object *args; | |
2220 | { | |
2221 | return run_hook_with_args (nargs, args, until_failure); | |
2222 | } | |
2223 | ||
c933ea05 RS |
2224 | /* ARGS[0] should be a hook symbol. |
2225 | Call each of the functions in the hook value, passing each of them | |
2226 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2227 | COND specifies a condition to test after each call | |
2228 | to decide whether to stop. | |
2229 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2230 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2231 | ||
ff936e53 SM |
2232 | Lisp_Object |
2233 | run_hook_with_args (nargs, args, cond) | |
2234 | int nargs; | |
2235 | Lisp_Object *args; | |
2236 | enum run_hooks_condition cond; | |
2237 | { | |
2238 | Lisp_Object sym, val, ret; | |
fada05d6 KH |
2239 | Lisp_Object globals; |
2240 | struct gcpro gcpro1, gcpro2, gcpro3; | |
b0b667cb | 2241 | |
f029ca5f RS |
2242 | /* If we are dying or still initializing, |
2243 | don't do anything--it would probably crash if we tried. */ | |
2244 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2245 | return Qnil; |
f029ca5f | 2246 | |
b0b667cb | 2247 | sym = args[0]; |
aa681b51 | 2248 | val = find_symbol_value (sym); |
ff936e53 SM |
2249 | ret = (cond == until_failure ? Qt : Qnil); |
2250 | ||
b0b667cb | 2251 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2252 | return ret; |
03699b14 | 2253 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2254 | { |
2255 | args[0] = val; | |
2256 | return Ffuncall (nargs, args); | |
2257 | } | |
2258 | else | |
2259 | { | |
fada05d6 KH |
2260 | globals = Qnil; |
2261 | GCPRO3 (sym, val, globals); | |
cb9d21f8 | 2262 | |
ff936e53 SM |
2263 | for (; |
2264 | CONSP (val) && ((cond == to_completion) | |
2265 | || (cond == until_success ? NILP (ret) | |
2266 | : !NILP (ret))); | |
03699b14 | 2267 | val = XCDR (val)) |
b0b667cb | 2268 | { |
03699b14 | 2269 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2270 | { |
2271 | /* t indicates this hook has a local binding; | |
2272 | it means to run the global binding too. */ | |
b0b667cb | 2273 | |
ff936e53 SM |
2274 | for (globals = Fdefault_value (sym); |
2275 | CONSP (globals) && ((cond == to_completion) | |
2276 | || (cond == until_success ? NILP (ret) | |
2277 | : !NILP (ret))); | |
03699b14 | 2278 | globals = XCDR (globals)) |
b0b667cb | 2279 | { |
03699b14 | 2280 | args[0] = XCAR (globals); |
77d92e05 RS |
2281 | /* In a global value, t should not occur. If it does, we |
2282 | must ignore it to avoid an endless loop. */ | |
2283 | if (!EQ (args[0], Qt)) | |
2284 | ret = Ffuncall (nargs, args); | |
b0b667cb KH |
2285 | } |
2286 | } | |
2287 | else | |
2288 | { | |
03699b14 | 2289 | args[0] = XCAR (val); |
ff936e53 | 2290 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2291 | } |
2292 | } | |
cb9d21f8 RS |
2293 | |
2294 | UNGCPRO; | |
ff936e53 | 2295 | return ret; |
b0b667cb KH |
2296 | } |
2297 | } | |
c933ea05 RS |
2298 | |
2299 | /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual | |
2300 | present value of that symbol. | |
2301 | Call each element of FUNLIST, | |
2302 | passing each of them the rest of ARGS. | |
2303 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2304 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2305 | ||
2306 | Lisp_Object | |
2307 | run_hook_list_with_args (funlist, nargs, args) | |
2308 | Lisp_Object funlist; | |
2309 | int nargs; | |
2310 | Lisp_Object *args; | |
2311 | { | |
2312 | Lisp_Object sym; | |
2313 | Lisp_Object val; | |
fada05d6 KH |
2314 | Lisp_Object globals; |
2315 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c933ea05 RS |
2316 | |
2317 | sym = args[0]; | |
fada05d6 KH |
2318 | globals = Qnil; |
2319 | GCPRO3 (sym, val, globals); | |
c933ea05 | 2320 | |
03699b14 | 2321 | for (val = funlist; CONSP (val); val = XCDR (val)) |
c933ea05 | 2322 | { |
03699b14 | 2323 | if (EQ (XCAR (val), Qt)) |
c933ea05 RS |
2324 | { |
2325 | /* t indicates this hook has a local binding; | |
2326 | it means to run the global binding too. */ | |
c933ea05 RS |
2327 | |
2328 | for (globals = Fdefault_value (sym); | |
2329 | CONSP (globals); | |
03699b14 | 2330 | globals = XCDR (globals)) |
c933ea05 | 2331 | { |
03699b14 | 2332 | args[0] = XCAR (globals); |
77d92e05 RS |
2333 | /* In a global value, t should not occur. If it does, we |
2334 | must ignore it to avoid an endless loop. */ | |
2335 | if (!EQ (args[0], Qt)) | |
2336 | Ffuncall (nargs, args); | |
c933ea05 RS |
2337 | } |
2338 | } | |
2339 | else | |
2340 | { | |
03699b14 | 2341 | args[0] = XCAR (val); |
c933ea05 RS |
2342 | Ffuncall (nargs, args); |
2343 | } | |
2344 | } | |
2345 | UNGCPRO; | |
2346 | return Qnil; | |
2347 | } | |
7d48558f RS |
2348 | |
2349 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ | |
2350 | ||
2351 | void | |
2352 | run_hook_with_args_2 (hook, arg1, arg2) | |
2353 | Lisp_Object hook, arg1, arg2; | |
2354 | { | |
2355 | Lisp_Object temp[3]; | |
2356 | temp[0] = hook; | |
2357 | temp[1] = arg1; | |
2358 | temp[2] = arg2; | |
2359 | ||
2360 | Frun_hook_with_args (3, temp); | |
2361 | } | |
ff936e53 | 2362 | \f |
db9f0278 JB |
2363 | /* Apply fn to arg */ |
2364 | Lisp_Object | |
2365 | apply1 (fn, arg) | |
2366 | Lisp_Object fn, arg; | |
2367 | { | |
a6e3fa71 JB |
2368 | struct gcpro gcpro1; |
2369 | ||
2370 | GCPRO1 (fn); | |
265a9e55 | 2371 | if (NILP (arg)) |
a6e3fa71 JB |
2372 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2373 | gcpro1.nvars = 2; | |
db9f0278 JB |
2374 | #ifdef NO_ARG_ARRAY |
2375 | { | |
2376 | Lisp_Object args[2]; | |
2377 | args[0] = fn; | |
2378 | args[1] = arg; | |
a6e3fa71 JB |
2379 | gcpro1.var = args; |
2380 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 JB |
2381 | } |
2382 | #else /* not NO_ARG_ARRAY */ | |
a6e3fa71 | 2383 | RETURN_UNGCPRO (Fapply (2, &fn)); |
db9f0278 JB |
2384 | #endif /* not NO_ARG_ARRAY */ |
2385 | } | |
2386 | ||
2387 | /* Call function fn on no arguments */ | |
2388 | Lisp_Object | |
2389 | call0 (fn) | |
2390 | Lisp_Object fn; | |
2391 | { | |
a6e3fa71 JB |
2392 | struct gcpro gcpro1; |
2393 | ||
2394 | GCPRO1 (fn); | |
2395 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2396 | } |
2397 | ||
15285f9f | 2398 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2399 | /* ARGSUSED */ |
2400 | Lisp_Object | |
15285f9f RS |
2401 | call1 (fn, arg1) |
2402 | Lisp_Object fn, arg1; | |
db9f0278 | 2403 | { |
a6e3fa71 | 2404 | struct gcpro gcpro1; |
db9f0278 | 2405 | #ifdef NO_ARG_ARRAY |
a6e3fa71 JB |
2406 | Lisp_Object args[2]; |
2407 | ||
db9f0278 | 2408 | args[0] = fn; |
15285f9f | 2409 | args[1] = arg1; |
a6e3fa71 JB |
2410 | GCPRO1 (args[0]); |
2411 | gcpro1.nvars = 2; | |
2412 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 | 2413 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2414 | GCPRO1 (fn); |
2415 | gcpro1.nvars = 2; | |
2416 | RETURN_UNGCPRO (Ffuncall (2, &fn)); | |
db9f0278 JB |
2417 | #endif /* not NO_ARG_ARRAY */ |
2418 | } | |
2419 | ||
15285f9f | 2420 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2421 | /* ARGSUSED */ |
2422 | Lisp_Object | |
15285f9f RS |
2423 | call2 (fn, arg1, arg2) |
2424 | Lisp_Object fn, arg1, arg2; | |
db9f0278 | 2425 | { |
a6e3fa71 | 2426 | struct gcpro gcpro1; |
db9f0278 JB |
2427 | #ifdef NO_ARG_ARRAY |
2428 | Lisp_Object args[3]; | |
2429 | args[0] = fn; | |
15285f9f RS |
2430 | args[1] = arg1; |
2431 | args[2] = arg2; | |
a6e3fa71 JB |
2432 | GCPRO1 (args[0]); |
2433 | gcpro1.nvars = 3; | |
2434 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 | 2435 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2436 | GCPRO1 (fn); |
2437 | gcpro1.nvars = 3; | |
2438 | RETURN_UNGCPRO (Ffuncall (3, &fn)); | |
db9f0278 JB |
2439 | #endif /* not NO_ARG_ARRAY */ |
2440 | } | |
2441 | ||
15285f9f | 2442 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2443 | /* ARGSUSED */ |
2444 | Lisp_Object | |
15285f9f RS |
2445 | call3 (fn, arg1, arg2, arg3) |
2446 | Lisp_Object fn, arg1, arg2, arg3; | |
db9f0278 | 2447 | { |
a6e3fa71 | 2448 | struct gcpro gcpro1; |
db9f0278 JB |
2449 | #ifdef NO_ARG_ARRAY |
2450 | Lisp_Object args[4]; | |
2451 | args[0] = fn; | |
15285f9f RS |
2452 | args[1] = arg1; |
2453 | args[2] = arg2; | |
2454 | args[3] = arg3; | |
a6e3fa71 JB |
2455 | GCPRO1 (args[0]); |
2456 | gcpro1.nvars = 4; | |
2457 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 | 2458 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2459 | GCPRO1 (fn); |
2460 | gcpro1.nvars = 4; | |
2461 | RETURN_UNGCPRO (Ffuncall (4, &fn)); | |
db9f0278 JB |
2462 | #endif /* not NO_ARG_ARRAY */ |
2463 | } | |
2464 | ||
15285f9f | 2465 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2466 | /* ARGSUSED */ |
2467 | Lisp_Object | |
15285f9f RS |
2468 | call4 (fn, arg1, arg2, arg3, arg4) |
2469 | Lisp_Object fn, arg1, arg2, arg3, arg4; | |
a5a44b91 JB |
2470 | { |
2471 | struct gcpro gcpro1; | |
2472 | #ifdef NO_ARG_ARRAY | |
2473 | Lisp_Object args[5]; | |
2474 | args[0] = fn; | |
15285f9f RS |
2475 | args[1] = arg1; |
2476 | args[2] = arg2; | |
2477 | args[3] = arg3; | |
2478 | args[4] = arg4; | |
a5a44b91 JB |
2479 | GCPRO1 (args[0]); |
2480 | gcpro1.nvars = 5; | |
2481 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
2482 | #else /* not NO_ARG_ARRAY */ | |
2483 | GCPRO1 (fn); | |
2484 | gcpro1.nvars = 5; | |
2485 | RETURN_UNGCPRO (Ffuncall (5, &fn)); | |
2486 | #endif /* not NO_ARG_ARRAY */ | |
2487 | } | |
2488 | ||
15285f9f RS |
2489 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2490 | /* ARGSUSED */ | |
2491 | Lisp_Object | |
2492 | call5 (fn, arg1, arg2, arg3, arg4, arg5) | |
2493 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5; | |
2494 | { | |
2495 | struct gcpro gcpro1; | |
2496 | #ifdef NO_ARG_ARRAY | |
2497 | Lisp_Object args[6]; | |
2498 | args[0] = fn; | |
2499 | args[1] = arg1; | |
2500 | args[2] = arg2; | |
2501 | args[3] = arg3; | |
2502 | args[4] = arg4; | |
2503 | args[5] = arg5; | |
2504 | GCPRO1 (args[0]); | |
2505 | gcpro1.nvars = 6; | |
2506 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
2507 | #else /* not NO_ARG_ARRAY */ | |
2508 | GCPRO1 (fn); | |
2509 | gcpro1.nvars = 6; | |
2510 | RETURN_UNGCPRO (Ffuncall (6, &fn)); | |
2511 | #endif /* not NO_ARG_ARRAY */ | |
2512 | } | |
2513 | ||
2514 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2515 | /* ARGSUSED */ | |
2516 | Lisp_Object | |
2517 | call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6) | |
2518 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6; | |
2519 | { | |
2520 | struct gcpro gcpro1; | |
2521 | #ifdef NO_ARG_ARRAY | |
2522 | Lisp_Object args[7]; | |
2523 | args[0] = fn; | |
2524 | args[1] = arg1; | |
2525 | args[2] = arg2; | |
2526 | args[3] = arg3; | |
2527 | args[4] = arg4; | |
2528 | args[5] = arg5; | |
2529 | args[6] = arg6; | |
2530 | GCPRO1 (args[0]); | |
2531 | gcpro1.nvars = 7; | |
2532 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
2533 | #else /* not NO_ARG_ARRAY */ | |
2534 | GCPRO1 (fn); | |
2535 | gcpro1.nvars = 7; | |
2536 | RETURN_UNGCPRO (Ffuncall (7, &fn)); | |
2537 | #endif /* not NO_ARG_ARRAY */ | |
2538 | } | |
2539 | ||
db9f0278 JB |
2540 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
2541 | "Call first argument as a function, passing remaining arguments to it.\n\ | |
fd7fe9a1 | 2542 | Return the value that function returns.\n\ |
db9f0278 JB |
2543 | Thus, (funcall 'cons 'x 'y) returns (x . y).") |
2544 | (nargs, args) | |
2545 | int nargs; | |
2546 | Lisp_Object *args; | |
2547 | { | |
2548 | Lisp_Object fun; | |
2549 | Lisp_Object funcar; | |
2550 | int numargs = nargs - 1; | |
2551 | Lisp_Object lisp_numargs; | |
2552 | Lisp_Object val; | |
2553 | struct backtrace backtrace; | |
2554 | register Lisp_Object *internal_args; | |
2555 | register int i; | |
2556 | ||
2557 | QUIT; | |
2558 | if (consing_since_gc > gc_cons_threshold) | |
a6e3fa71 | 2559 | Fgarbage_collect (); |
db9f0278 JB |
2560 | |
2561 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2562 | { | |
2563 | if (max_lisp_eval_depth < 100) | |
2564 | max_lisp_eval_depth = 100; | |
2565 | if (lisp_eval_depth > max_lisp_eval_depth) | |
2566 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
2567 | } | |
2568 | ||
2569 | backtrace.next = backtrace_list; | |
2570 | backtrace_list = &backtrace; | |
2571 | backtrace.function = &args[0]; | |
2572 | backtrace.args = &args[1]; | |
2573 | backtrace.nargs = nargs - 1; | |
2574 | backtrace.evalargs = 0; | |
2575 | backtrace.debug_on_exit = 0; | |
2576 | ||
2577 | if (debug_on_next_call) | |
2578 | do_debug_on_call (Qlambda); | |
2579 | ||
2580 | retry: | |
2581 | ||
2582 | fun = args[0]; | |
ffd56f97 JB |
2583 | |
2584 | fun = Findirect_function (fun); | |
db9f0278 | 2585 | |
90165123 | 2586 | if (SUBRP (fun)) |
db9f0278 JB |
2587 | { |
2588 | if (numargs < XSUBR (fun)->min_args | |
2589 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2590 | { | |
a631e24c | 2591 | XSETFASTINT (lisp_numargs, numargs); |
db9f0278 JB |
2592 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (lisp_numargs, Qnil))); |
2593 | } | |
2594 | ||
2595 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2596 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2597 | ||
2598 | if (XSUBR (fun)->max_args == MANY) | |
2599 | { | |
2600 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
2601 | goto done; | |
2602 | } | |
2603 | ||
2604 | if (XSUBR (fun)->max_args > numargs) | |
2605 | { | |
2606 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
2607 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
2608 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
2609 | internal_args[i] = Qnil; | |
2610 | } | |
2611 | else | |
2612 | internal_args = args + 1; | |
2613 | switch (XSUBR (fun)->max_args) | |
2614 | { | |
2615 | case 0: | |
2616 | val = (*XSUBR (fun)->function) (); | |
2617 | goto done; | |
2618 | case 1: | |
2619 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
2620 | goto done; | |
2621 | case 2: | |
2622 | val = (*XSUBR (fun)->function) (internal_args[0], | |
2623 | internal_args[1]); | |
2624 | goto done; | |
2625 | case 3: | |
2626 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2627 | internal_args[2]); | |
2628 | goto done; | |
2629 | case 4: | |
2630 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2631 | internal_args[2], | |
2632 | internal_args[3]); | |
2633 | goto done; | |
2634 | case 5: | |
2635 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2636 | internal_args[2], internal_args[3], | |
2637 | internal_args[4]); | |
2638 | goto done; | |
2639 | case 6: | |
2640 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2641 | internal_args[2], internal_args[3], | |
2642 | internal_args[4], internal_args[5]); | |
2643 | goto done; | |
15c65264 RS |
2644 | case 7: |
2645 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2646 | internal_args[2], internal_args[3], | |
2647 | internal_args[4], internal_args[5], | |
2648 | internal_args[6]); | |
2649 | goto done; | |
db9f0278 | 2650 | |
166c822d KH |
2651 | case 8: |
2652 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2653 | internal_args[2], internal_args[3], | |
2654 | internal_args[4], internal_args[5], | |
2655 | internal_args[6], internal_args[7]); | |
2656 | goto done; | |
2657 | ||
db9f0278 | 2658 | default: |
70ee42f7 | 2659 | |
166c822d | 2660 | /* If a subr takes more than 8 arguments without using MANY |
70ee42f7 JB |
2661 | or UNEVALLED, we need to extend this function to support it. |
2662 | Until this is done, there is no way to call the function. */ | |
2663 | abort (); | |
db9f0278 JB |
2664 | } |
2665 | } | |
90165123 | 2666 | if (COMPILEDP (fun)) |
db9f0278 JB |
2667 | val = funcall_lambda (fun, numargs, args + 1); |
2668 | else | |
2669 | { | |
2670 | if (!CONSP (fun)) | |
2671 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2672 | funcar = Fcar (fun); | |
90165123 | 2673 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
2674 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
2675 | if (EQ (funcar, Qlambda)) | |
2676 | val = funcall_lambda (fun, numargs, args + 1); | |
2677 | else if (EQ (funcar, Qmocklisp)) | |
2678 | val = ml_apply (fun, Flist (numargs, args + 1)); | |
2679 | else if (EQ (funcar, Qautoload)) | |
2680 | { | |
2681 | do_autoload (fun, args[0]); | |
2682 | goto retry; | |
2683 | } | |
2684 | else | |
2685 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2686 | } | |
2687 | done: | |
2688 | lisp_eval_depth--; | |
2689 | if (backtrace.debug_on_exit) | |
2690 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2691 | backtrace_list = backtrace.next; | |
2692 | return val; | |
2693 | } | |
2694 | \f | |
2695 | Lisp_Object | |
2696 | apply_lambda (fun, args, eval_flag) | |
2697 | Lisp_Object fun, args; | |
2698 | int eval_flag; | |
2699 | { | |
2700 | Lisp_Object args_left; | |
2701 | Lisp_Object numargs; | |
2702 | register Lisp_Object *arg_vector; | |
2703 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2704 | register int i; | |
2705 | register Lisp_Object tem; | |
2706 | ||
2707 | numargs = Flength (args); | |
2708 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
2709 | args_left = args; | |
2710 | ||
2711 | GCPRO3 (*arg_vector, args_left, fun); | |
2712 | gcpro1.nvars = 0; | |
2713 | ||
2714 | for (i = 0; i < XINT (numargs);) | |
2715 | { | |
2716 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
2717 | if (eval_flag) tem = Feval (tem); | |
2718 | arg_vector[i++] = tem; | |
2719 | gcpro1.nvars = i; | |
2720 | } | |
2721 | ||
2722 | UNGCPRO; | |
2723 | ||
2724 | if (eval_flag) | |
2725 | { | |
2726 | backtrace_list->args = arg_vector; | |
2727 | backtrace_list->nargs = i; | |
2728 | } | |
2729 | backtrace_list->evalargs = 0; | |
2730 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
2731 | ||
2732 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2733 | if (backtrace_list->debug_on_exit) | |
2734 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
2735 | /* Don't do it again when we return to eval. */ | |
2736 | backtrace_list->debug_on_exit = 0; | |
2737 | return tem; | |
2738 | } | |
2739 | ||
2740 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2741 | and return the result of evaluation. | |
2742 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2743 | ||
2744 | Lisp_Object | |
2745 | funcall_lambda (fun, nargs, arg_vector) | |
2746 | Lisp_Object fun; | |
2747 | int nargs; | |
2748 | register Lisp_Object *arg_vector; | |
2749 | { | |
9ab90667 | 2750 | Lisp_Object val, syms_left, next; |
db9f0278 | 2751 | int count = specpdl_ptr - specpdl; |
9ab90667 | 2752 | int i, optional, rest; |
db9f0278 | 2753 | |
9ab90667 GM |
2754 | if (NILP (Vmocklisp_arguments)) |
2755 | specbind (Qmocklisp_arguments, Qt); /* t means NOT mocklisp! */ | |
db9f0278 | 2756 | |
90165123 | 2757 | if (CONSP (fun)) |
9ab90667 GM |
2758 | { |
2759 | syms_left = XCDR (fun); | |
2760 | if (CONSP (syms_left)) | |
2761 | syms_left = XCAR (syms_left); | |
2762 | else | |
2763 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2764 | } | |
90165123 | 2765 | else if (COMPILEDP (fun)) |
db9f0278 | 2766 | syms_left = XVECTOR (fun)->contents[COMPILED_ARGLIST]; |
9ab90667 GM |
2767 | else |
2768 | abort (); | |
db9f0278 | 2769 | |
9ab90667 GM |
2770 | i = optional = rest = 0; |
2771 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
2772 | { |
2773 | QUIT; | |
9ab90667 GM |
2774 | |
2775 | next = XCAR (syms_left); | |
90165123 | 2776 | while (!SYMBOLP (next)) |
9ffa21d4 | 2777 | next = Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
9ab90667 | 2778 | |
db9f0278 JB |
2779 | if (EQ (next, Qand_rest)) |
2780 | rest = 1; | |
2781 | else if (EQ (next, Qand_optional)) | |
2782 | optional = 1; | |
2783 | else if (rest) | |
2784 | { | |
9ffa21d4 | 2785 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
2786 | i = nargs; |
2787 | } | |
2788 | else if (i < nargs) | |
9ab90667 | 2789 | specbind (next, arg_vector[i++]); |
db9f0278 | 2790 | else if (!optional) |
9ab90667 GM |
2791 | return Fsignal (Qwrong_number_of_arguments, |
2792 | Fcons (fun, Fcons (make_number (nargs), Qnil))); | |
db9f0278 JB |
2793 | else |
2794 | specbind (next, Qnil); | |
2795 | } | |
2796 | ||
9ab90667 GM |
2797 | if (!NILP (syms_left)) |
2798 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2799 | else if (i < nargs) | |
2800 | return Fsignal (Qwrong_number_of_arguments, | |
2801 | Fcons (fun, Fcons (make_number (nargs), Qnil))); | |
db9f0278 | 2802 | |
90165123 | 2803 | if (CONSP (fun)) |
9ab90667 | 2804 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 2805 | else |
ca248607 RS |
2806 | { |
2807 | /* If we have not actually read the bytecode string | |
2808 | and constants vector yet, fetch them from the file. */ | |
2809 | if (CONSP (XVECTOR (fun)->contents[COMPILED_BYTECODE])) | |
661c7d6e | 2810 | Ffetch_bytecode (fun); |
ca248607 RS |
2811 | val = Fbyte_code (XVECTOR (fun)->contents[COMPILED_BYTECODE], |
2812 | XVECTOR (fun)->contents[COMPILED_CONSTANTS], | |
2813 | XVECTOR (fun)->contents[COMPILED_STACK_DEPTH]); | |
2814 | } | |
9ab90667 | 2815 | |
db9f0278 JB |
2816 | return unbind_to (count, val); |
2817 | } | |
661c7d6e KH |
2818 | |
2819 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
2820 | 1, 1, 0, | |
2821 | "If byte-compiled OBJECT is lazy-loaded, fetch it now.") | |
2822 | (object) | |
2823 | Lisp_Object object; | |
2824 | { | |
2825 | Lisp_Object tem; | |
2826 | ||
2827 | if (COMPILEDP (object) | |
2828 | && CONSP (XVECTOR (object)->contents[COMPILED_BYTECODE])) | |
2829 | { | |
2830 | tem = read_doc_string (XVECTOR (object)->contents[COMPILED_BYTECODE]); | |
5bbdb090 RS |
2831 | if (!CONSP (tem)) |
2832 | error ("invalid byte code"); | |
03699b14 KR |
2833 | XVECTOR (object)->contents[COMPILED_BYTECODE] = XCAR (tem); |
2834 | XVECTOR (object)->contents[COMPILED_CONSTANTS] = XCDR (tem); | |
661c7d6e KH |
2835 | } |
2836 | return object; | |
2837 | } | |
db9f0278 JB |
2838 | \f |
2839 | void | |
2840 | grow_specpdl () | |
2841 | { | |
2842 | register int count = specpdl_ptr - specpdl; | |
2843 | if (specpdl_size >= max_specpdl_size) | |
2844 | { | |
2845 | if (max_specpdl_size < 400) | |
2846 | max_specpdl_size = 400; | |
2847 | if (specpdl_size >= max_specpdl_size) | |
2848 | { | |
debee8fe RS |
2849 | if (!NILP (Vdebug_on_error)) |
2850 | /* Leave room for some specpdl in the debugger. */ | |
2851 | max_specpdl_size = specpdl_size + 100; | |
db9f0278 JB |
2852 | Fsignal (Qerror, |
2853 | Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil)); | |
db9f0278 JB |
2854 | } |
2855 | } | |
2856 | specpdl_size *= 2; | |
2857 | if (specpdl_size > max_specpdl_size) | |
2858 | specpdl_size = max_specpdl_size; | |
2859 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
2860 | specpdl_ptr = specpdl + count; | |
2861 | } | |
2862 | ||
2863 | void | |
2864 | specbind (symbol, value) | |
2865 | Lisp_Object symbol, value; | |
2866 | { | |
db9f0278 JB |
2867 | Lisp_Object ovalue; |
2868 | ||
9ffa21d4 | 2869 | CHECK_SYMBOL (symbol, 0); |
db9f0278 JB |
2870 | if (specpdl_ptr == specpdl + specpdl_size) |
2871 | grow_specpdl (); | |
719177b3 | 2872 | |
9ab90667 GM |
2873 | /* The most common case is that a non-constant symbol with a trivial |
2874 | value. Make that as fast as we can. */ | |
2875 | if (!MISCP (XSYMBOL (symbol)->value) | |
2876 | && !EQ (symbol, Qnil) | |
2877 | && !EQ (symbol, Qt) | |
2878 | && !(XSYMBOL (symbol)->name->data[0] == ':' | |
2879 | && EQ (XSYMBOL (symbol)->obarray, initial_obarray) | |
9ab90667 | 2880 | && !EQ (value, symbol))) |
719177b3 | 2881 | { |
9ab90667 GM |
2882 | specpdl_ptr->symbol = symbol; |
2883 | specpdl_ptr->old_value = XSYMBOL (symbol)->value; | |
2884 | specpdl_ptr->func = NULL; | |
2885 | ++specpdl_ptr; | |
2886 | XSYMBOL (symbol)->value = value; | |
719177b3 RS |
2887 | } |
2888 | else | |
9ab90667 GM |
2889 | { |
2890 | ovalue = find_symbol_value (symbol); | |
2891 | specpdl_ptr->func = 0; | |
2892 | specpdl_ptr->old_value = ovalue; | |
719177b3 | 2893 | |
9ab90667 GM |
2894 | if (BUFFER_LOCAL_VALUEP (XSYMBOL (symbol)->value) |
2895 | || SOME_BUFFER_LOCAL_VALUEP (XSYMBOL (symbol)->value) | |
2896 | || BUFFER_OBJFWDP (XSYMBOL (symbol)->value)) | |
2897 | { | |
2898 | Lisp_Object current_buffer, binding_buffer; | |
2899 | /* For a local variable, record both the symbol and which | |
2900 | buffer's value we are saving. */ | |
2901 | current_buffer = Fcurrent_buffer (); | |
2902 | binding_buffer = current_buffer; | |
2903 | /* If the variable is not local in this buffer, | |
2904 | we are saving the global value, so restore that. */ | |
2905 | if (NILP (Flocal_variable_p (symbol, binding_buffer))) | |
2906 | binding_buffer = Qnil; | |
2907 | specpdl_ptr->symbol | |
2908 | = Fcons (symbol, Fcons (binding_buffer, current_buffer)); | |
2909 | } | |
2910 | else | |
2911 | specpdl_ptr->symbol = symbol; | |
2912 | ||
2913 | specpdl_ptr++; | |
2914 | if (BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue)) | |
2915 | store_symval_forwarding (symbol, ovalue, value); | |
2916 | else | |
2917 | set_internal (symbol, value, 0, 1); | |
2918 | } | |
db9f0278 JB |
2919 | } |
2920 | ||
2921 | void | |
2922 | record_unwind_protect (function, arg) | |
1d159538 | 2923 | Lisp_Object (*function) P_ ((Lisp_Object)); |
db9f0278 JB |
2924 | Lisp_Object arg; |
2925 | { | |
2926 | if (specpdl_ptr == specpdl + specpdl_size) | |
2927 | grow_specpdl (); | |
2928 | specpdl_ptr->func = function; | |
2929 | specpdl_ptr->symbol = Qnil; | |
2930 | specpdl_ptr->old_value = arg; | |
2931 | specpdl_ptr++; | |
2932 | } | |
2933 | ||
2934 | Lisp_Object | |
2935 | unbind_to (count, value) | |
2936 | int count; | |
2937 | Lisp_Object value; | |
2938 | { | |
265a9e55 | 2939 | int quitf = !NILP (Vquit_flag); |
db9f0278 JB |
2940 | struct gcpro gcpro1; |
2941 | ||
2942 | GCPRO1 (value); | |
db9f0278 JB |
2943 | Vquit_flag = Qnil; |
2944 | ||
2945 | while (specpdl_ptr != specpdl + count) | |
2946 | { | |
2947 | --specpdl_ptr; | |
9ab90667 | 2948 | |
db9f0278 JB |
2949 | if (specpdl_ptr->func != 0) |
2950 | (*specpdl_ptr->func) (specpdl_ptr->old_value); | |
2951 | /* Note that a "binding" of nil is really an unwind protect, | |
719177b3 | 2952 | so in that case the "old value" is a list of forms to evaluate. */ |
265a9e55 | 2953 | else if (NILP (specpdl_ptr->symbol)) |
db9f0278 | 2954 | Fprogn (specpdl_ptr->old_value); |
27a6c729 RS |
2955 | /* If the symbol is a list, it is really |
2956 | (SYMBOL BINDING_BUFFER . CURRENT_BUFFER) | |
2957 | and it indicates we bound a variable that has | |
2958 | buffer-local bindings. */ | |
719177b3 RS |
2959 | else if (CONSP (specpdl_ptr->symbol)) |
2960 | { | |
2961 | Lisp_Object symbol, buffer; | |
2962 | ||
2963 | symbol = XCAR (specpdl_ptr->symbol); | |
27a6c729 | 2964 | buffer = XCAR (XCDR (specpdl_ptr->symbol)); |
719177b3 RS |
2965 | |
2966 | /* Handle restoring a default value. */ | |
2967 | if (NILP (buffer)) | |
2968 | Fset_default (symbol, specpdl_ptr->old_value); | |
2969 | /* Handle restoring a value saved from a live buffer. */ | |
2970 | else | |
2971 | set_internal (symbol, specpdl_ptr->old_value, XBUFFER (buffer), 1); | |
2972 | } | |
db9f0278 | 2973 | else |
9ab90667 GM |
2974 | { |
2975 | /* If variable has a trivial value (no forwarding), we can | |
2976 | just set it. No need to check for constant symbols here, | |
2977 | since that was already done by specbind. */ | |
2978 | if (!MISCP (XSYMBOL (specpdl_ptr->symbol)->value)) | |
2979 | XSYMBOL (specpdl_ptr->symbol)->value = specpdl_ptr->old_value; | |
2980 | else | |
2981 | set_internal (specpdl_ptr->symbol, specpdl_ptr->old_value, 0, 1); | |
2982 | } | |
db9f0278 | 2983 | } |
9ab90667 GM |
2984 | |
2985 | if (NILP (Vquit_flag) && quitf) | |
2986 | Vquit_flag = Qt; | |
db9f0278 JB |
2987 | |
2988 | UNGCPRO; | |
db9f0278 JB |
2989 | return value; |
2990 | } | |
2991 | \f | |
2992 | #if 0 | |
2993 | ||
2994 | /* Get the value of symbol's global binding, even if that binding | |
2995 | is not now dynamically visible. */ | |
2996 | ||
2997 | Lisp_Object | |
2998 | top_level_value (symbol) | |
2999 | Lisp_Object symbol; | |
3000 | { | |
3001 | register struct specbinding *ptr = specpdl; | |
3002 | ||
3003 | CHECK_SYMBOL (symbol, 0); | |
3004 | for (; ptr != specpdl_ptr; ptr++) | |
3005 | { | |
3006 | if (EQ (ptr->symbol, symbol)) | |
3007 | return ptr->old_value; | |
3008 | } | |
3009 | return Fsymbol_value (symbol); | |
3010 | } | |
3011 | ||
3012 | Lisp_Object | |
3013 | top_level_set (symbol, newval) | |
3014 | Lisp_Object symbol, newval; | |
3015 | { | |
3016 | register struct specbinding *ptr = specpdl; | |
3017 | ||
3018 | CHECK_SYMBOL (symbol, 0); | |
3019 | for (; ptr != specpdl_ptr; ptr++) | |
3020 | { | |
3021 | if (EQ (ptr->symbol, symbol)) | |
3022 | { | |
3023 | ptr->old_value = newval; | |
3024 | return newval; | |
3025 | } | |
3026 | } | |
3027 | return Fset (symbol, newval); | |
3028 | } | |
3029 | ||
3030 | #endif /* 0 */ | |
3031 | \f | |
3032 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, | |
3033 | "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\ | |
3034 | The debugger is entered when that frame exits, if the flag is non-nil.") | |
3035 | (level, flag) | |
3036 | Lisp_Object level, flag; | |
3037 | { | |
3038 | register struct backtrace *backlist = backtrace_list; | |
3039 | register int i; | |
3040 | ||
3041 | CHECK_NUMBER (level, 0); | |
3042 | ||
3043 | for (i = 0; backlist && i < XINT (level); i++) | |
3044 | { | |
3045 | backlist = backlist->next; | |
3046 | } | |
3047 | ||
3048 | if (backlist) | |
265a9e55 | 3049 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3050 | |
3051 | return flag; | |
3052 | } | |
3053 | ||
3054 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
3055 | "Print a trace of Lisp function calls currently active.\n\ | |
3056 | Output stream used is value of `standard-output'.") | |
3057 | () | |
3058 | { | |
3059 | register struct backtrace *backlist = backtrace_list; | |
3060 | register int i; | |
3061 | Lisp_Object tail; | |
3062 | Lisp_Object tem; | |
3063 | extern Lisp_Object Vprint_level; | |
3064 | struct gcpro gcpro1; | |
3065 | ||
a631e24c | 3066 | XSETFASTINT (Vprint_level, 3); |
db9f0278 JB |
3067 | |
3068 | tail = Qnil; | |
3069 | GCPRO1 (tail); | |
3070 | ||
3071 | while (backlist) | |
3072 | { | |
3073 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
3074 | if (backlist->nargs == UNEVALLED) | |
3075 | { | |
3076 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3077 | write_string ("\n", -1); |
db9f0278 JB |
3078 | } |
3079 | else | |
3080 | { | |
3081 | tem = *backlist->function; | |
3082 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
3083 | write_string ("(", -1); | |
3084 | if (backlist->nargs == MANY) | |
3085 | { | |
3086 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 3087 | !NILP (tail); |
db9f0278 JB |
3088 | tail = Fcdr (tail), i++) |
3089 | { | |
3090 | if (i) write_string (" ", -1); | |
3091 | Fprin1 (Fcar (tail), Qnil); | |
3092 | } | |
3093 | } | |
3094 | else | |
3095 | { | |
3096 | for (i = 0; i < backlist->nargs; i++) | |
3097 | { | |
3098 | if (i) write_string (" ", -1); | |
3099 | Fprin1 (backlist->args[i], Qnil); | |
3100 | } | |
3101 | } | |
b6703b02 | 3102 | write_string (")\n", -1); |
db9f0278 | 3103 | } |
db9f0278 JB |
3104 | backlist = backlist->next; |
3105 | } | |
3106 | ||
3107 | Vprint_level = Qnil; | |
3108 | UNGCPRO; | |
3109 | return Qnil; | |
3110 | } | |
3111 | ||
3112 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, "", | |
79e8bfbf | 3113 | "Return the function and arguments NFRAMES up from current execution point.\n\ |
db9f0278 JB |
3114 | If that frame has not evaluated the arguments yet (or is a special form),\n\ |
3115 | the value is (nil FUNCTION ARG-FORMS...).\n\ | |
3116 | If that frame has evaluated its arguments and called its function already,\n\ | |
3117 | the value is (t FUNCTION ARG-VALUES...).\n\ | |
3118 | A &rest arg is represented as the tail of the list ARG-VALUES.\n\ | |
3119 | FUNCTION is whatever was supplied as car of evaluated list,\n\ | |
3120 | or a lambda expression for macro calls.\n\ | |
79e8bfbf | 3121 | If NFRAMES is more than the number of frames, the value is nil.") |
db9f0278 JB |
3122 | (nframes) |
3123 | Lisp_Object nframes; | |
3124 | { | |
3125 | register struct backtrace *backlist = backtrace_list; | |
3126 | register int i; | |
3127 | Lisp_Object tem; | |
3128 | ||
3129 | CHECK_NATNUM (nframes, 0); | |
3130 | ||
3131 | /* Find the frame requested. */ | |
b6703b02 | 3132 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3133 | backlist = backlist->next; |
3134 | ||
3135 | if (!backlist) | |
3136 | return Qnil; | |
3137 | if (backlist->nargs == UNEVALLED) | |
3138 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
3139 | else | |
3140 | { | |
3141 | if (backlist->nargs == MANY) | |
3142 | tem = *backlist->args; | |
3143 | else | |
3144 | tem = Flist (backlist->nargs, backlist->args); | |
3145 | ||
3146 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3147 | } | |
3148 | } | |
a2ff3819 | 3149 | |
db9f0278 | 3150 | \f |
dfcf069d | 3151 | void |
db9f0278 JB |
3152 | syms_of_eval () |
3153 | { | |
3154 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
7eaada67 RS |
3155 | "*Limit on number of Lisp variable bindings & unwind-protects.\n\ |
3156 | If Lisp code tries to make more than this many at once,\n\ | |
3157 | an error is signaled."); | |
db9f0278 JB |
3158 | |
3159 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
7eaada67 | 3160 | "*Limit on depth in `eval', `apply' and `funcall' before error.\n\ |
db9f0278 JB |
3161 | This limit is to catch infinite recursions for you before they cause\n\ |
3162 | actual stack overflow in C, which would be fatal for Emacs.\n\ | |
3163 | You can safely make it considerably larger than its default value,\n\ | |
3164 | if that proves inconveniently small."); | |
3165 | ||
3166 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
3167 | "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\ | |
d0b68896 | 3168 | Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'."); |
db9f0278 JB |
3169 | Vquit_flag = Qnil; |
3170 | ||
3171 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
3172 | "Non-nil inhibits C-g quitting from happening immediately.\n\ | |
3173 | Note that `quit-flag' will still be set by typing C-g,\n\ | |
690337b7 | 3174 | so a quit will be signaled as soon as `inhibit-quit' is nil.\n\ |
db9f0278 JB |
3175 | To prevent this happening, set `quit-flag' to nil\n\ |
3176 | before making `inhibit-quit' nil."); | |
3177 | Vinhibit_quit = Qnil; | |
3178 | ||
ad236261 JB |
3179 | Qinhibit_quit = intern ("inhibit-quit"); |
3180 | staticpro (&Qinhibit_quit); | |
3181 | ||
db9f0278 JB |
3182 | Qautoload = intern ("autoload"); |
3183 | staticpro (&Qautoload); | |
3184 | ||
3185 | Qdebug_on_error = intern ("debug-on-error"); | |
3186 | staticpro (&Qdebug_on_error); | |
3187 | ||
3188 | Qmacro = intern ("macro"); | |
3189 | staticpro (&Qmacro); | |
3190 | ||
3191 | /* Note that the process handling also uses Qexit, but we don't want | |
3192 | to staticpro it twice, so we just do it here. */ | |
3193 | Qexit = intern ("exit"); | |
3194 | staticpro (&Qexit); | |
3195 | ||
3196 | Qinteractive = intern ("interactive"); | |
3197 | staticpro (&Qinteractive); | |
3198 | ||
3199 | Qcommandp = intern ("commandp"); | |
3200 | staticpro (&Qcommandp); | |
3201 | ||
3202 | Qdefun = intern ("defun"); | |
3203 | staticpro (&Qdefun); | |
3204 | ||
3205 | Qand_rest = intern ("&rest"); | |
3206 | staticpro (&Qand_rest); | |
3207 | ||
3208 | Qand_optional = intern ("&optional"); | |
3209 | staticpro (&Qand_optional); | |
3210 | ||
128c0f66 | 3211 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
db9f0278 | 3212 | "*Non-nil means automatically display a backtrace buffer\n\ |
128c0f66 RM |
3213 | after any error that is handled by the editor command loop.\n\ |
3214 | If the value is a list, an error only means to display a backtrace\n\ | |
3215 | if one of its condition symbols appears in the list."); | |
3216 | Vstack_trace_on_error = Qnil; | |
db9f0278 | 3217 | |
128c0f66 | 3218 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
db9f0278 JB |
3219 | "*Non-nil means enter debugger if an error is signaled.\n\ |
3220 | Does not apply to errors handled by `condition-case'.\n\ | |
128c0f66 RM |
3221 | If the value is a list, an error only means to enter the debugger\n\ |
3222 | if one of its condition symbols appears in the list.\n\ | |
db9f0278 | 3223 | See also variable `debug-on-quit'."); |
128c0f66 | 3224 | Vdebug_on_error = Qnil; |
db9f0278 | 3225 | |
fc950e09 KH |
3226 | DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors, |
3227 | "*List of errors for which the debugger should not be called.\n\ | |
3228 | Each element may be a condition-name or a regexp that matches error messages.\n\ | |
3229 | If any element applies to a given error, that error skips the debugger\n\ | |
3230 | and just returns to top level.\n\ | |
3231 | This overrides the variable `debug-on-error'.\n\ | |
3232 | It does not apply to errors handled by `condition-case'."); | |
3233 | Vdebug_ignored_errors = Qnil; | |
3234 | ||
db9f0278 | 3235 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, |
d0b68896 | 3236 | "*Non-nil means enter debugger if quit is signaled (C-g, for example).\n\ |
1b7d8239 | 3237 | Does not apply if quit is handled by a `condition-case'."); |
db9f0278 JB |
3238 | debug_on_quit = 0; |
3239 | ||
3240 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
3241 | "Non-nil means enter debugger before next `eval', `apply' or `funcall'."); | |
3242 | ||
556d7314 GM |
3243 | DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue, |
3244 | "Non-nil means debugger may continue execution.\n\ | |
3245 | This is nil when the debugger is called under circumstances where it\n\ | |
3246 | might not be safe to continue."); | |
dac204bc | 3247 | debugger_may_continue = 1; |
556d7314 | 3248 | |
db9f0278 JB |
3249 | DEFVAR_LISP ("debugger", &Vdebugger, |
3250 | "Function to call to invoke debugger.\n\ | |
3251 | If due to frame exit, args are `exit' and the value being returned;\n\ | |
3252 | this function's value will be returned instead of that.\n\ | |
3253 | If due to error, args are `error' and a list of the args to `signal'.\n\ | |
3254 | If due to `apply' or `funcall' entry, one arg, `lambda'.\n\ | |
3255 | If due to `eval' entry, one arg, t."); | |
3256 | Vdebugger = Qnil; | |
3257 | ||
61ede770 RS |
3258 | DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function, |
3259 | "If non-nil, this is a function for `signal' to call.\n\ | |
3260 | It receives the same arguments that `signal' was given.\n\ | |
3261 | The Edebug package uses this to regain control."); | |
3262 | Vsignal_hook_function = Qnil; | |
3263 | ||
db9f0278 JB |
3264 | Qmocklisp_arguments = intern ("mocklisp-arguments"); |
3265 | staticpro (&Qmocklisp_arguments); | |
3266 | DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments, | |
3267 | "While in a mocklisp function, the list of its unevaluated args."); | |
3268 | Vmocklisp_arguments = Qt; | |
3269 | ||
57a6e758 | 3270 | DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal, |
61ede770 RS |
3271 | "*Non-nil means call the debugger regardless of condition handlers.\n\ |
3272 | Note that `debug-on-error', `debug-on-quit' and friends\n\ | |
3273 | still determine whether to handle the particular condition."); | |
57a6e758 | 3274 | Vdebug_on_signal = Qnil; |
61ede770 | 3275 | |
6e6e9f08 RS |
3276 | Vrun_hooks = intern ("run-hooks"); |
3277 | staticpro (&Vrun_hooks); | |
db9f0278 JB |
3278 | |
3279 | staticpro (&Vautoload_queue); | |
3280 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3281 | staticpro (&Vsignaling_function); |
3282 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3283 | |
3284 | defsubr (&Sor); | |
3285 | defsubr (&Sand); | |
3286 | defsubr (&Sif); | |
3287 | defsubr (&Scond); | |
3288 | defsubr (&Sprogn); | |
3289 | defsubr (&Sprog1); | |
3290 | defsubr (&Sprog2); | |
3291 | defsubr (&Ssetq); | |
3292 | defsubr (&Squote); | |
3293 | defsubr (&Sfunction); | |
3294 | defsubr (&Sdefun); | |
3295 | defsubr (&Sdefmacro); | |
3296 | defsubr (&Sdefvar); | |
3297 | defsubr (&Sdefconst); | |
3298 | defsubr (&Suser_variable_p); | |
3299 | defsubr (&Slet); | |
3300 | defsubr (&SletX); | |
3301 | defsubr (&Swhile); | |
3302 | defsubr (&Smacroexpand); | |
3303 | defsubr (&Scatch); | |
3304 | defsubr (&Sthrow); | |
3305 | defsubr (&Sunwind_protect); | |
3306 | defsubr (&Scondition_case); | |
3307 | defsubr (&Ssignal); | |
3308 | defsubr (&Sinteractive_p); | |
3309 | defsubr (&Scommandp); | |
3310 | defsubr (&Sautoload); | |
3311 | defsubr (&Seval); | |
3312 | defsubr (&Sapply); | |
3313 | defsubr (&Sfuncall); | |
ff936e53 SM |
3314 | defsubr (&Srun_hooks); |
3315 | defsubr (&Srun_hook_with_args); | |
3316 | defsubr (&Srun_hook_with_args_until_success); | |
3317 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 3318 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3319 | defsubr (&Sbacktrace_debug); |
3320 | defsubr (&Sbacktrace); | |
3321 | defsubr (&Sbacktrace_frame); | |
3322 | } |