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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
e0f331ab | 2 | Copyright (C) 1985, 86, 87, 93, 94, 95, 99, 2000, 2001 |
1182a7cb | 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 | |
2901f1d1 | 123 | EMACS_INT max_specpdl_size; |
db9f0278 JB |
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 | |
2901f1d1 | 131 | EMACS_INT max_lisp_eval_depth; |
db9f0278 JB |
132 | |
133 | /* Nonzero means enter debugger before next function call */ | |
4c576a83 | 134 | |
db9f0278 JB |
135 | int debug_on_next_call; |
136 | ||
1b1acc13 | 137 | /* Non-zero means debugger may continue. This is zero when the |
556d7314 GM |
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 | 153 | /* List of conditions and regexps specifying error messages which |
1b1acc13 | 154 | do not enter the debugger even if Vdebug_on_error 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 | ||
2901f1d1 SM |
193 | static Lisp_Object funcall_lambda P_ ((Lisp_Object, int, Lisp_Object*)); |
194 | /* Apply a mocklisp function to unevaluated argument list. */ | |
195 | extern Lisp_Object ml_apply P_ ((Lisp_Object, Lisp_Object)); | |
db9f0278 | 196 | |
dfcf069d | 197 | void |
db9f0278 JB |
198 | init_eval_once () |
199 | { | |
200 | specpdl_size = 50; | |
716acfce | 201 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 202 | specpdl_ptr = specpdl; |
db9f0278 | 203 | max_specpdl_size = 600; |
969f5145 | 204 | max_lisp_eval_depth = 300; |
34d470ba RS |
205 | |
206 | Vrun_hooks = Qnil; | |
db9f0278 JB |
207 | } |
208 | ||
dfcf069d | 209 | void |
db9f0278 JB |
210 | init_eval () |
211 | { | |
212 | specpdl_ptr = specpdl; | |
213 | catchlist = 0; | |
214 | handlerlist = 0; | |
215 | backtrace_list = 0; | |
216 | Vquit_flag = Qnil; | |
217 | debug_on_next_call = 0; | |
218 | lisp_eval_depth = 0; | |
87e21fbd | 219 | #ifdef DEBUG_GCPRO |
15934ffa | 220 | gcpro_level = 0; |
87e21fbd | 221 | #endif |
be857679 | 222 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 223 | when_entered_debugger = -1; |
db9f0278 JB |
224 | } |
225 | ||
226 | Lisp_Object | |
227 | call_debugger (arg) | |
228 | Lisp_Object arg; | |
229 | { | |
3648c842 | 230 | int debug_while_redisplaying; |
556d7314 | 231 | int count = specpdl_ptr - specpdl; |
3648c842 GM |
232 | Lisp_Object val; |
233 | ||
db9f0278 JB |
234 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) |
235 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
3648c842 | 236 | |
db9f0278 JB |
237 | if (specpdl_size + 40 > max_specpdl_size) |
238 | max_specpdl_size = specpdl_size + 40; | |
3648c842 | 239 | |
237c23b0 | 240 | #ifdef HAVE_X_WINDOWS |
df6c90d8 GM |
241 | if (display_hourglass_p) |
242 | cancel_hourglass (); | |
237c23b0 GM |
243 | #endif |
244 | ||
db9f0278 | 245 | debug_on_next_call = 0; |
be857679 | 246 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
247 | |
248 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
249 | displayed if the debugger is invoked during redisplay. */ | |
250 | debug_while_redisplaying = redisplaying_p; | |
251 | redisplaying_p = 0; | |
556d7314 GM |
252 | specbind (intern ("debugger-may-continue"), |
253 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 254 | specbind (Qinhibit_redisplay, Qnil); |
9db6f6b4 GM |
255 | |
256 | #if 0 /* Binding this prevents execution of Lisp code during | |
257 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 258 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 259 | #endif |
3648c842 GM |
260 | |
261 | val = apply1 (Vdebugger, arg); | |
262 | ||
263 | /* Interrupting redisplay and resuming it later is not safe under | |
264 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 265 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
266 | if (debug_while_redisplaying) |
267 | Ftop_level (); | |
268 | ||
556d7314 | 269 | return unbind_to (count, val); |
db9f0278 JB |
270 | } |
271 | ||
dfcf069d | 272 | void |
db9f0278 JB |
273 | do_debug_on_call (code) |
274 | Lisp_Object code; | |
275 | { | |
276 | debug_on_next_call = 0; | |
277 | backtrace_list->debug_on_exit = 1; | |
278 | call_debugger (Fcons (code, Qnil)); | |
279 | } | |
280 | \f | |
281 | /* NOTE!!! Every function that can call EVAL must protect its args | |
282 | and temporaries from garbage collection while it needs them. | |
283 | The definition of `For' shows what you have to do. */ | |
284 | ||
285 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
286 | doc: /* Eval args until one of them yields non-nil, then return that value. |
287 | The remaining args are not evalled at all. | |
288 | If all args return nil, return nil. | |
289 | usage: (or CONDITIONS ...) */) | |
290 | (args) | |
db9f0278 JB |
291 | Lisp_Object args; |
292 | { | |
293 | register Lisp_Object val; | |
294 | Lisp_Object args_left; | |
295 | struct gcpro gcpro1; | |
296 | ||
265a9e55 | 297 | if (NILP(args)) |
db9f0278 JB |
298 | return Qnil; |
299 | ||
300 | args_left = args; | |
301 | GCPRO1 (args_left); | |
302 | ||
303 | do | |
304 | { | |
305 | val = Feval (Fcar (args_left)); | |
265a9e55 | 306 | if (!NILP (val)) |
db9f0278 JB |
307 | break; |
308 | args_left = Fcdr (args_left); | |
309 | } | |
265a9e55 | 310 | while (!NILP(args_left)); |
db9f0278 JB |
311 | |
312 | UNGCPRO; | |
313 | return val; | |
314 | } | |
315 | ||
316 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 317 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
318 | The remaining args are not evalled at all. |
319 | If no arg yields nil, return the last arg's value. | |
320 | usage: (and CONDITIONS ...) */) | |
321 | (args) | |
db9f0278 JB |
322 | Lisp_Object args; |
323 | { | |
324 | register Lisp_Object val; | |
325 | Lisp_Object args_left; | |
326 | struct gcpro gcpro1; | |
327 | ||
265a9e55 | 328 | if (NILP(args)) |
db9f0278 JB |
329 | return Qt; |
330 | ||
331 | args_left = args; | |
332 | GCPRO1 (args_left); | |
333 | ||
334 | do | |
335 | { | |
336 | val = Feval (Fcar (args_left)); | |
265a9e55 | 337 | if (NILP (val)) |
db9f0278 JB |
338 | break; |
339 | args_left = Fcdr (args_left); | |
340 | } | |
265a9e55 | 341 | while (!NILP(args_left)); |
db9f0278 JB |
342 | |
343 | UNGCPRO; | |
344 | return val; | |
345 | } | |
346 | ||
347 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 348 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
349 | Returns the value of THEN or the value of the last of the ELSE's. |
350 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
351 | If COND yields nil, and there are no ELSE's, the value is nil. | |
352 | usage: (if COND THEN ELSE...) */) | |
353 | (args) | |
db9f0278 JB |
354 | Lisp_Object args; |
355 | { | |
356 | register Lisp_Object cond; | |
357 | struct gcpro gcpro1; | |
358 | ||
359 | GCPRO1 (args); | |
360 | cond = Feval (Fcar (args)); | |
361 | UNGCPRO; | |
362 | ||
265a9e55 | 363 | if (!NILP (cond)) |
db9f0278 JB |
364 | return Feval (Fcar (Fcdr (args))); |
365 | return Fprogn (Fcdr (Fcdr (args))); | |
366 | } | |
367 | ||
368 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
369 | doc: /* Try each clause until one succeeds. |
370 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
371 | and, if the value is non-nil, this clause succeeds: | |
372 | then the expressions in BODY are evaluated and the last one's | |
373 | value is the value of the cond-form. | |
374 | If no clause succeeds, cond returns nil. | |
375 | If a clause has one element, as in (CONDITION), | |
376 | CONDITION's value if non-nil is returned from the cond-form. | |
377 | usage: (cond CLAUSES...) */) | |
378 | (args) | |
db9f0278 JB |
379 | Lisp_Object args; |
380 | { | |
381 | register Lisp_Object clause, val; | |
382 | struct gcpro gcpro1; | |
383 | ||
384 | val = Qnil; | |
385 | GCPRO1 (args); | |
265a9e55 | 386 | while (!NILP (args)) |
db9f0278 JB |
387 | { |
388 | clause = Fcar (args); | |
389 | val = Feval (Fcar (clause)); | |
265a9e55 | 390 | if (!NILP (val)) |
db9f0278 | 391 | { |
03699b14 KR |
392 | if (!EQ (XCDR (clause), Qnil)) |
393 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
394 | break; |
395 | } | |
03699b14 | 396 | args = XCDR (args); |
db9f0278 JB |
397 | } |
398 | UNGCPRO; | |
399 | ||
400 | return val; | |
401 | } | |
402 | ||
403 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
404 | doc: /* Eval BODY forms sequentially and return value of last one. |
405 | usage: (progn BODY ...) */) | |
406 | (args) | |
db9f0278 JB |
407 | Lisp_Object args; |
408 | { | |
409 | register Lisp_Object val, tem; | |
410 | Lisp_Object args_left; | |
411 | struct gcpro gcpro1; | |
412 | ||
413 | /* In Mocklisp code, symbols at the front of the progn arglist | |
414 | are to be bound to zero. */ | |
415 | if (!EQ (Vmocklisp_arguments, Qt)) | |
416 | { | |
417 | val = make_number (0); | |
90165123 | 418 | while (!NILP (args) && (tem = Fcar (args), SYMBOLP (tem))) |
db9f0278 JB |
419 | { |
420 | QUIT; | |
421 | specbind (tem, val), args = Fcdr (args); | |
422 | } | |
423 | } | |
424 | ||
265a9e55 | 425 | if (NILP(args)) |
db9f0278 JB |
426 | return Qnil; |
427 | ||
428 | args_left = args; | |
429 | GCPRO1 (args_left); | |
430 | ||
431 | do | |
432 | { | |
433 | val = Feval (Fcar (args_left)); | |
434 | args_left = Fcdr (args_left); | |
435 | } | |
265a9e55 | 436 | while (!NILP(args_left)); |
db9f0278 JB |
437 | |
438 | UNGCPRO; | |
439 | return val; | |
440 | } | |
441 | ||
442 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
443 | doc: /* Eval FIRST and BODY sequentially; value from FIRST. |
444 | The value of FIRST is saved during the evaluation of the remaining args, | |
445 | whose values are discarded. | |
446 | usage: (prog1 FIRST BODY...) */) | |
447 | (args) | |
db9f0278 JB |
448 | Lisp_Object args; |
449 | { | |
450 | Lisp_Object val; | |
451 | register Lisp_Object args_left; | |
452 | struct gcpro gcpro1, gcpro2; | |
453 | register int argnum = 0; | |
454 | ||
265a9e55 | 455 | if (NILP(args)) |
db9f0278 JB |
456 | return Qnil; |
457 | ||
458 | args_left = args; | |
459 | val = Qnil; | |
460 | GCPRO2 (args, val); | |
461 | ||
462 | do | |
463 | { | |
464 | if (!(argnum++)) | |
465 | val = Feval (Fcar (args_left)); | |
466 | else | |
467 | Feval (Fcar (args_left)); | |
468 | args_left = Fcdr (args_left); | |
469 | } | |
265a9e55 | 470 | while (!NILP(args_left)); |
db9f0278 JB |
471 | |
472 | UNGCPRO; | |
473 | return val; | |
474 | } | |
475 | ||
476 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
477 | doc: /* Eval X, Y and BODY sequentially; value from Y. |
478 | The value of Y is saved during the evaluation of the remaining args, | |
479 | whose values are discarded. | |
480 | usage: (prog2 X Y BODY...) */) | |
481 | (args) | |
db9f0278 JB |
482 | Lisp_Object args; |
483 | { | |
484 | Lisp_Object val; | |
485 | register Lisp_Object args_left; | |
486 | struct gcpro gcpro1, gcpro2; | |
487 | register int argnum = -1; | |
488 | ||
489 | val = Qnil; | |
490 | ||
87d238ba | 491 | if (NILP (args)) |
db9f0278 JB |
492 | return Qnil; |
493 | ||
494 | args_left = args; | |
495 | val = Qnil; | |
496 | GCPRO2 (args, val); | |
497 | ||
498 | do | |
499 | { | |
500 | if (!(argnum++)) | |
501 | val = Feval (Fcar (args_left)); | |
502 | else | |
503 | Feval (Fcar (args_left)); | |
504 | args_left = Fcdr (args_left); | |
505 | } | |
87d238ba | 506 | while (!NILP (args_left)); |
db9f0278 JB |
507 | |
508 | UNGCPRO; | |
509 | return val; | |
510 | } | |
511 | ||
512 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
513 | doc: /* Set each SYM to the value of its VAL. |
514 | The symbols SYM are variables; they are literal (not evaluated). | |
515 | The values VAL are expressions; they are evaluated. | |
516 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
517 | The second VAL is not computed until after the first SYM is set, and so on; | |
518 | each VAL can use the new value of variables set earlier in the `setq'. | |
519 | The return value of the `setq' form is the value of the last VAL. | |
520 | usage: (setq SYM VAL SYM VAL ...) */) | |
521 | (args) | |
db9f0278 JB |
522 | Lisp_Object args; |
523 | { | |
524 | register Lisp_Object args_left; | |
525 | register Lisp_Object val, sym; | |
526 | struct gcpro gcpro1; | |
527 | ||
265a9e55 | 528 | if (NILP(args)) |
db9f0278 JB |
529 | return Qnil; |
530 | ||
531 | args_left = args; | |
532 | GCPRO1 (args); | |
533 | ||
534 | do | |
535 | { | |
536 | val = Feval (Fcar (Fcdr (args_left))); | |
537 | sym = Fcar (args_left); | |
538 | Fset (sym, val); | |
539 | args_left = Fcdr (Fcdr (args_left)); | |
540 | } | |
265a9e55 | 541 | while (!NILP(args_left)); |
db9f0278 JB |
542 | |
543 | UNGCPRO; | |
544 | return val; | |
545 | } | |
546 | ||
547 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
548 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
549 | usage: (quote ARG) */) | |
550 | (args) | |
db9f0278 JB |
551 | Lisp_Object args; |
552 | { | |
553 | return Fcar (args); | |
554 | } | |
555 | ||
556 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
557 | doc: /* Like `quote', but preferred for objects which are functions. |
558 | In byte compilation, `function' causes its argument to be compiled. | |
559 | `quote' cannot do that. | |
560 | usage: (function ARG) */) | |
561 | (args) | |
db9f0278 JB |
562 | Lisp_Object args; |
563 | { | |
564 | return Fcar (args); | |
565 | } | |
566 | ||
e0f331ab | 567 | |
db9f0278 | 568 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
9dbc9081 PJ |
569 | doc: /* Return t if function in which this appears was called interactively. |
570 | This means that the function was called with call-interactively (which | |
571 | includes being called as the binding of a key) | |
572 | and input is currently coming from the keyboard (not in keyboard macro). */) | |
573 | () | |
db9f0278 | 574 | { |
e0f331ab GM |
575 | return interactive_p (1) ? Qt : Qnil; |
576 | } | |
577 | ||
578 | ||
579 | /* Return 1 if function in which this appears was called | |
580 | interactively. This means that the function was called with | |
581 | call-interactively (which includes being called as the binding of | |
582 | a key) and input is currently coming from the keyboard (not in | |
583 | keyboard macro). | |
584 | ||
585 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
586 | called is a built-in. */ | |
587 | ||
588 | int | |
589 | interactive_p (exclude_subrs_p) | |
590 | int exclude_subrs_p; | |
591 | { | |
592 | struct backtrace *btp; | |
593 | Lisp_Object fun; | |
db9f0278 JB |
594 | |
595 | if (!INTERACTIVE) | |
e0f331ab | 596 | return 0; |
db9f0278 | 597 | |
db9f0278 | 598 | btp = backtrace_list; |
daa37602 JB |
599 | |
600 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 601 | the top for Finteractive_p. If so, skip it. */ |
daa37602 | 602 | fun = Findirect_function (*btp->function); |
0598f773 | 603 | if (SUBRP (fun) && XSUBR (fun) == &Sinteractive_p) |
db9f0278 | 604 | btp = btp->next; |
daa37602 JB |
605 | |
606 | /* If we're running an Emacs 18-style byte-compiled function, there | |
607 | may be a frame for Fbytecode. Now, given the strictest | |
608 | definition, this function isn't really being called | |
609 | interactively, but because that's the way Emacs 18 always builds | |
610 | byte-compiled functions, we'll accept it for now. */ | |
611 | if (EQ (*btp->function, Qbytecode)) | |
612 | btp = btp->next; | |
613 | ||
614 | /* If this isn't a byte-compiled function, then we may now be | |
615 | looking at several frames for special forms. Skip past them. */ | |
616 | while (btp && | |
617 | btp->nargs == UNEVALLED) | |
a6e3fa71 JB |
618 | btp = btp->next; |
619 | ||
daa37602 JB |
620 | /* btp now points at the frame of the innermost function that isn't |
621 | a special form, ignoring frames for Finteractive_p and/or | |
622 | Fbytecode at the top. If this frame is for a built-in function | |
623 | (such as load or eval-region) return nil. */ | |
ffd56f97 | 624 | fun = Findirect_function (*btp->function); |
e0f331ab GM |
625 | if (exclude_subrs_p && SUBRP (fun)) |
626 | return 0; | |
627 | ||
db9f0278 JB |
628 | /* btp points to the frame of a Lisp function that called interactive-p. |
629 | Return t if that function was called interactively. */ | |
630 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
631 | return 1; |
632 | return 0; | |
db9f0278 JB |
633 | } |
634 | ||
e0f331ab | 635 | |
db9f0278 | 636 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
637 | doc: /* Define NAME as a function. |
638 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
639 | See also the function `interactive'. | |
640 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) | |
641 | (args) | |
db9f0278 JB |
642 | Lisp_Object args; |
643 | { | |
644 | register Lisp_Object fn_name; | |
645 | register Lisp_Object defn; | |
646 | ||
647 | fn_name = Fcar (args); | |
648 | defn = Fcons (Qlambda, Fcdr (args)); | |
265a9e55 | 649 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
650 | defn = Fpurecopy (defn); |
651 | Ffset (fn_name, defn); | |
2a49b6e5 | 652 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
653 | return fn_name; |
654 | } | |
655 | ||
656 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
657 | doc: /* Define NAME as a macro. |
658 | The definition is (macro lambda ARGLIST [DOCSTRING] BODY...). | |
659 | When the macro is called, as in (NAME ARGS...), | |
660 | the function (lambda ARGLIST BODY...) is applied to | |
661 | the list ARGS... as it appears in the expression, | |
662 | and the result should be a form to be evaluated instead of the original. | |
663 | usage: (defmacro NAME ARGLIST [DOCSTRING] BODY...) */) | |
664 | (args) | |
db9f0278 JB |
665 | Lisp_Object args; |
666 | { | |
667 | register Lisp_Object fn_name; | |
668 | register Lisp_Object defn; | |
669 | ||
670 | fn_name = Fcar (args); | |
671 | defn = Fcons (Qmacro, Fcons (Qlambda, Fcdr (args))); | |
265a9e55 | 672 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
673 | defn = Fpurecopy (defn); |
674 | Ffset (fn_name, defn); | |
2a49b6e5 | 675 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
676 | return fn_name; |
677 | } | |
678 | ||
19cebf5a GM |
679 | |
680 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 2, 0, | |
9dbc9081 PJ |
681 | doc: /* Make SYMBOL a variable alias for symbol ALIASED. |
682 | Setting the value of SYMBOL will subsequently set the value of ALIASED, | |
683 | and getting the value of SYMBOL will return the value ALIASED has. | |
684 | ALIASED nil means remove the alias; SYMBOL is unbound after that. */) | |
685 | (symbol, aliased) | |
19cebf5a GM |
686 | Lisp_Object symbol, aliased; |
687 | { | |
688 | struct Lisp_Symbol *sym; | |
689 | ||
b7826503 PJ |
690 | CHECK_SYMBOL (symbol); |
691 | CHECK_SYMBOL (aliased); | |
19cebf5a GM |
692 | |
693 | if (SYMBOL_CONSTANT_P (symbol)) | |
694 | error ("Cannot make a constant an alias"); | |
695 | ||
696 | sym = XSYMBOL (symbol); | |
697 | sym->indirect_variable = 1; | |
698 | sym->value = aliased; | |
699 | sym->constant = SYMBOL_CONSTANT_P (aliased); | |
700 | LOADHIST_ATTACH (symbol); | |
701 | ||
702 | return aliased; | |
703 | } | |
704 | ||
705 | ||
db9f0278 | 706 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
9dbc9081 PJ |
707 | doc: /* Define SYMBOL as a variable. |
708 | You are not required to define a variable in order to use it, | |
709 | but the definition can supply documentation and an initial value | |
710 | in a way that tags can recognize. | |
711 | ||
712 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
713 | If SYMBOL is buffer-local, its default value is what is set; | |
714 | buffer-local values are not affected. | |
715 | INITVALUE and DOCSTRING are optional. | |
716 | If DOCSTRING starts with *, this variable is identified as a user option. | |
717 | This means that M-x set-variable recognizes it. | |
718 | See also `user-variable-p'. | |
719 | If INITVALUE is missing, SYMBOL's value is not set. | |
2df5238c | 720 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
9dbc9081 | 721 | (args) |
db9f0278 JB |
722 | Lisp_Object args; |
723 | { | |
a42ba017 | 724 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
725 | |
726 | sym = Fcar (args); | |
a42ba017 RS |
727 | tail = Fcdr (args); |
728 | if (!NILP (Fcdr (Fcdr (tail)))) | |
729 | error ("too many arguments"); | |
730 | ||
33568849 | 731 | tem = Fdefault_boundp (sym); |
a42ba017 | 732 | if (!NILP (tail)) |
db9f0278 | 733 | { |
265a9e55 | 734 | if (NILP (tem)) |
33568849 SM |
735 | Fset_default (sym, Feval (Fcar (tail))); |
736 | tail = Fcdr (tail); | |
737 | if (!NILP (Fcar (tail))) | |
738 | { | |
739 | tem = Fcar (tail); | |
740 | if (!NILP (Vpurify_flag)) | |
741 | tem = Fpurecopy (tem); | |
742 | Fput (sym, Qvariable_documentation, tem); | |
743 | } | |
744 | LOADHIST_ATTACH (sym); | |
db9f0278 | 745 | } |
33568849 SM |
746 | else |
747 | /* A (defvar <var>) should not take precedence in the load-history over | |
748 | an earlier (defvar <var> <val>), so only add to history if the default | |
749 | value is still unbound. */ | |
750 | if (NILP (tem)) | |
751 | LOADHIST_ATTACH (sym); | |
752 | ||
db9f0278 JB |
753 | return sym; |
754 | } | |
755 | ||
756 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
757 | doc: /* Define SYMBOL as a constant variable. |
758 | The intent is that neither programs nor users should ever change this value. | |
759 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
760 | If SYMBOL is buffer-local, its default value is what is set; | |
761 | buffer-local values are not affected. | |
762 | DOCSTRING is optional. | |
763 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) | |
764 | (args) | |
db9f0278 JB |
765 | Lisp_Object args; |
766 | { | |
767 | register Lisp_Object sym, tem; | |
768 | ||
769 | sym = Fcar (args); | |
a42ba017 RS |
770 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
771 | error ("too many arguments"); | |
772 | ||
1182a7cb DL |
773 | tem = Feval (Fcar (Fcdr (args))); |
774 | if (!NILP (Vpurify_flag)) | |
775 | tem = Fpurecopy (tem); | |
776 | Fset_default (sym, tem); | |
db9f0278 | 777 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 778 | if (!NILP (tem)) |
db9f0278 | 779 | { |
265a9e55 | 780 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
781 | tem = Fpurecopy (tem); |
782 | Fput (sym, Qvariable_documentation, tem); | |
783 | } | |
2a49b6e5 | 784 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
785 | return sym; |
786 | } | |
787 | ||
788 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, | |
9dbc9081 PJ |
789 | doc: /* Returns t if VARIABLE is intended to be set and modified by users. |
790 | \(The alternative is a variable used internally in a Lisp program.) | |
791 | Determined by whether the first character of the documentation | |
792 | for the variable is `*' or if the variable is customizable (has a non-nil | |
793 | value of any of `custom-type', `custom-loads' or `standard-value' | |
794 | on its property list). */) | |
795 | (variable) | |
db9f0278 JB |
796 | Lisp_Object variable; |
797 | { | |
798 | Lisp_Object documentation; | |
799 | ||
5e78e475 RS |
800 | if (!SYMBOLP (variable)) |
801 | return Qnil; | |
802 | ||
db9f0278 | 803 | documentation = Fget (variable, Qvariable_documentation); |
90165123 | 804 | if (INTEGERP (documentation) && XINT (documentation) < 0) |
db9f0278 | 805 | return Qt; |
65411977 RS |
806 | if (STRINGP (documentation) |
807 | && ((unsigned char) XSTRING (documentation)->data[0] == '*')) | |
808 | return Qt; | |
809 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ | |
810 | if (CONSP (documentation) | |
03699b14 KR |
811 | && STRINGP (XCAR (documentation)) |
812 | && INTEGERP (XCDR (documentation)) | |
813 | && XINT (XCDR (documentation)) < 0) | |
db9f0278 | 814 | return Qt; |
caff32a7 DL |
815 | /* Customizable? */ |
816 | if ((!NILP (Fget (variable, intern ("custom-type")))) | |
817 | || (!NILP (Fget (variable, intern ("custom-loads")))) | |
818 | || (!NILP (Fget (variable, intern ("standard-value"))))) | |
819 | return Qt; | |
db9f0278 JB |
820 | return Qnil; |
821 | } | |
822 | \f | |
823 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
824 | doc: /* Bind variables according to VARLIST then eval BODY. |
825 | The value of the last form in BODY is returned. | |
826 | Each element of VARLIST is a symbol (which is bound to nil) | |
827 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
828 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
829 | usage: (let* VARLIST BODY...) */) | |
830 | (args) | |
db9f0278 JB |
831 | Lisp_Object args; |
832 | { | |
833 | Lisp_Object varlist, val, elt; | |
834 | int count = specpdl_ptr - specpdl; | |
835 | struct gcpro gcpro1, gcpro2, gcpro3; | |
836 | ||
837 | GCPRO3 (args, elt, varlist); | |
838 | ||
839 | varlist = Fcar (args); | |
265a9e55 | 840 | while (!NILP (varlist)) |
db9f0278 JB |
841 | { |
842 | QUIT; | |
843 | elt = Fcar (varlist); | |
90165123 | 844 | if (SYMBOLP (elt)) |
db9f0278 | 845 | specbind (elt, Qnil); |
08564963 JB |
846 | else if (! NILP (Fcdr (Fcdr (elt)))) |
847 | Fsignal (Qerror, | |
848 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
849 | elt)); | |
db9f0278 JB |
850 | else |
851 | { | |
852 | val = Feval (Fcar (Fcdr (elt))); | |
853 | specbind (Fcar (elt), val); | |
854 | } | |
855 | varlist = Fcdr (varlist); | |
856 | } | |
857 | UNGCPRO; | |
858 | val = Fprogn (Fcdr (args)); | |
859 | return unbind_to (count, val); | |
860 | } | |
861 | ||
862 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
863 | doc: /* Bind variables according to VARLIST then eval BODY. |
864 | The value of the last form in BODY is returned. | |
865 | Each element of VARLIST is a symbol (which is bound to nil) | |
866 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
867 | All the VALUEFORMs are evalled before any symbols are bound. | |
868 | usage: (let VARLIST BODY...) */) | |
869 | (args) | |
db9f0278 JB |
870 | Lisp_Object args; |
871 | { | |
872 | Lisp_Object *temps, tem; | |
873 | register Lisp_Object elt, varlist; | |
874 | int count = specpdl_ptr - specpdl; | |
875 | register int argnum; | |
876 | struct gcpro gcpro1, gcpro2; | |
877 | ||
878 | varlist = Fcar (args); | |
879 | ||
880 | /* Make space to hold the values to give the bound variables */ | |
881 | elt = Flength (varlist); | |
882 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
883 | ||
884 | /* Compute the values and store them in `temps' */ | |
885 | ||
886 | GCPRO2 (args, *temps); | |
887 | gcpro2.nvars = 0; | |
888 | ||
265a9e55 | 889 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
890 | { |
891 | QUIT; | |
892 | elt = Fcar (varlist); | |
90165123 | 893 | if (SYMBOLP (elt)) |
db9f0278 | 894 | temps [argnum++] = Qnil; |
08564963 JB |
895 | else if (! NILP (Fcdr (Fcdr (elt)))) |
896 | Fsignal (Qerror, | |
897 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
898 | elt)); | |
db9f0278 JB |
899 | else |
900 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
901 | gcpro2.nvars = argnum; | |
902 | } | |
903 | UNGCPRO; | |
904 | ||
905 | varlist = Fcar (args); | |
265a9e55 | 906 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
907 | { |
908 | elt = Fcar (varlist); | |
909 | tem = temps[argnum++]; | |
90165123 | 910 | if (SYMBOLP (elt)) |
db9f0278 JB |
911 | specbind (elt, tem); |
912 | else | |
913 | specbind (Fcar (elt), tem); | |
914 | } | |
915 | ||
916 | elt = Fprogn (Fcdr (args)); | |
917 | return unbind_to (count, elt); | |
918 | } | |
919 | ||
920 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
921 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
922 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
923 | until TEST returns nil. | |
924 | usage: (while TEST BODY...) */) | |
925 | (args) | |
db9f0278 JB |
926 | Lisp_Object args; |
927 | { | |
928 | Lisp_Object test, body, tem; | |
929 | struct gcpro gcpro1, gcpro2; | |
930 | ||
931 | GCPRO2 (test, body); | |
932 | ||
933 | test = Fcar (args); | |
934 | body = Fcdr (args); | |
e3c24a74 RS |
935 | while (tem = Feval (test), |
936 | (!EQ (Vmocklisp_arguments, Qt) ? XINT (tem) : !NILP (tem))) | |
db9f0278 JB |
937 | { |
938 | QUIT; | |
939 | Fprogn (body); | |
940 | } | |
941 | ||
942 | UNGCPRO; | |
943 | return Qnil; | |
944 | } | |
945 | ||
946 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
947 | doc: /* Return result of expanding macros at top level of FORM. |
948 | If FORM is not a macro call, it is returned unchanged. | |
949 | Otherwise, the macro is expanded and the expansion is considered | |
950 | in place of FORM. When a non-macro-call results, it is returned. | |
951 | ||
952 | The second optional arg ENVIRONMENT specifies an environment of macro | |
953 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
954 | (form, environment) | |
2e267a2e | 955 | Lisp_Object form; |
79e8bfbf | 956 | Lisp_Object environment; |
db9f0278 | 957 | { |
23d6b5a6 | 958 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
959 | register Lisp_Object expander, sym, def, tem; |
960 | ||
961 | while (1) | |
962 | { | |
963 | /* Come back here each time we expand a macro call, | |
964 | in case it expands into another macro call. */ | |
90165123 | 965 | if (!CONSP (form)) |
db9f0278 | 966 | break; |
23d6b5a6 | 967 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 968 | def = sym = XCAR (form); |
23d6b5a6 | 969 | tem = Qnil; |
db9f0278 JB |
970 | /* Trace symbols aliases to other symbols |
971 | until we get a symbol that is not an alias. */ | |
90165123 | 972 | while (SYMBOLP (def)) |
db9f0278 JB |
973 | { |
974 | QUIT; | |
23d6b5a6 | 975 | sym = def; |
79e8bfbf | 976 | tem = Fassq (sym, environment); |
265a9e55 | 977 | if (NILP (tem)) |
db9f0278 JB |
978 | { |
979 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
980 | if (!EQ (def, Qunbound)) |
981 | continue; | |
db9f0278 | 982 | } |
23d6b5a6 | 983 | break; |
db9f0278 | 984 | } |
79e8bfbf | 985 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 986 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 987 | if (NILP (tem)) |
db9f0278 | 988 | { |
79e8bfbf | 989 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 990 | Look at its function definition. */ |
90165123 | 991 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
992 | /* Not defined or definition not suitable */ |
993 | break; | |
03699b14 | 994 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
995 | { |
996 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 997 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 998 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
999 | /* Yes, load it and try again. */ |
1000 | { | |
ca20916b RS |
1001 | struct gcpro gcpro1; |
1002 | GCPRO1 (form); | |
ee9ee63c | 1003 | do_autoload (def, sym); |
ca20916b | 1004 | UNGCPRO; |
ee9ee63c JB |
1005 | continue; |
1006 | } | |
1007 | else | |
db9f0278 | 1008 | break; |
db9f0278 | 1009 | } |
03699b14 | 1010 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1011 | break; |
03699b14 | 1012 | else expander = XCDR (def); |
db9f0278 JB |
1013 | } |
1014 | else | |
1015 | { | |
03699b14 | 1016 | expander = XCDR (tem); |
265a9e55 | 1017 | if (NILP (expander)) |
db9f0278 JB |
1018 | break; |
1019 | } | |
03699b14 | 1020 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1021 | } |
1022 | return form; | |
1023 | } | |
1024 | \f | |
1025 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1026 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1027 | TAG is evalled to get the tag to use; it must not be nil. | |
1028 | ||
1029 | Then the BODY is executed. | |
1030 | Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'. | |
1031 | If no throw happens, `catch' returns the value of the last BODY form. | |
1032 | If a throw happens, it specifies the value to return from `catch'. | |
1033 | usage: (catch TAG BODY...) */) | |
1034 | (args) | |
db9f0278 JB |
1035 | Lisp_Object args; |
1036 | { | |
1037 | register Lisp_Object tag; | |
1038 | struct gcpro gcpro1; | |
1039 | ||
1040 | GCPRO1 (args); | |
1041 | tag = Feval (Fcar (args)); | |
1042 | UNGCPRO; | |
1043 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1044 | } | |
1045 | ||
1046 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1047 | FUNC should return a Lisp_Object. | |
1048 | This is how catches are done from within C code. */ | |
1049 | ||
1050 | Lisp_Object | |
1051 | internal_catch (tag, func, arg) | |
1052 | Lisp_Object tag; | |
1053 | Lisp_Object (*func) (); | |
1054 | Lisp_Object arg; | |
1055 | { | |
1056 | /* This structure is made part of the chain `catchlist'. */ | |
1057 | struct catchtag c; | |
1058 | ||
1059 | /* Fill in the components of c, and put it on the list. */ | |
1060 | c.next = catchlist; | |
1061 | c.tag = tag; | |
1062 | c.val = Qnil; | |
1063 | c.backlist = backtrace_list; | |
1064 | c.handlerlist = handlerlist; | |
1065 | c.lisp_eval_depth = lisp_eval_depth; | |
1066 | c.pdlcount = specpdl_ptr - specpdl; | |
1067 | c.poll_suppress_count = poll_suppress_count; | |
1068 | c.gcpro = gcprolist; | |
bcf28080 | 1069 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1070 | catchlist = &c; |
1071 | ||
1072 | /* Call FUNC. */ | |
1073 | if (! _setjmp (c.jmp)) | |
1074 | c.val = (*func) (arg); | |
1075 | ||
1076 | /* Throw works by a longjmp that comes right here. */ | |
1077 | catchlist = c.next; | |
1078 | return c.val; | |
1079 | } | |
1080 | ||
ba410f40 JB |
1081 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1082 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1083 | |
ba410f40 JB |
1084 | This is the guts Fthrow and Fsignal; they differ only in the way |
1085 | they choose the catch tag to throw to. A catch tag for a | |
1086 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1087 | |
ba410f40 JB |
1088 | Before each catch is discarded, unbind all special bindings and |
1089 | execute all unwind-protect clauses made above that catch. Unwind | |
1090 | the handler stack as we go, so that the proper handlers are in | |
1091 | effect for each unwind-protect clause we run. At the end, restore | |
1092 | some static info saved in CATCH, and longjmp to the location | |
1093 | specified in the | |
1094 | ||
1095 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1096 | |
1097 | static void | |
ba410f40 | 1098 | unwind_to_catch (catch, value) |
db9f0278 | 1099 | struct catchtag *catch; |
ba410f40 | 1100 | Lisp_Object value; |
db9f0278 JB |
1101 | { |
1102 | register int last_time; | |
1103 | ||
ba410f40 JB |
1104 | /* Save the value in the tag. */ |
1105 | catch->val = value; | |
1106 | ||
82da7701 | 1107 | /* Restore the polling-suppression count. */ |
1cdc3155 | 1108 | set_poll_suppress_count (catch->poll_suppress_count); |
82da7701 | 1109 | |
db9f0278 JB |
1110 | do |
1111 | { | |
1112 | last_time = catchlist == catch; | |
82da7701 JB |
1113 | |
1114 | /* Unwind the specpdl stack, and then restore the proper set of | |
1115 | handlers. */ | |
db9f0278 JB |
1116 | unbind_to (catchlist->pdlcount, Qnil); |
1117 | handlerlist = catchlist->handlerlist; | |
1118 | catchlist = catchlist->next; | |
1119 | } | |
1120 | while (! last_time); | |
1121 | ||
bcf28080 | 1122 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1123 | gcprolist = catch->gcpro; |
15934ffa RS |
1124 | #ifdef DEBUG_GCPRO |
1125 | if (gcprolist != 0) | |
1126 | gcpro_level = gcprolist->level + 1; | |
1127 | else | |
1128 | gcpro_level = 0; | |
1129 | #endif | |
db9f0278 JB |
1130 | backtrace_list = catch->backlist; |
1131 | lisp_eval_depth = catch->lisp_eval_depth; | |
ba410f40 JB |
1132 | |
1133 | _longjmp (catch->jmp, 1); | |
db9f0278 JB |
1134 | } |
1135 | ||
1136 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
9dbc9081 PJ |
1137 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1138 | Both TAG and VALUE are evalled. */) | |
1139 | (tag, value) | |
79e8bfbf | 1140 | register Lisp_Object tag, value; |
db9f0278 JB |
1141 | { |
1142 | register struct catchtag *c; | |
1143 | ||
1144 | while (1) | |
1145 | { | |
265a9e55 | 1146 | if (!NILP (tag)) |
db9f0278 JB |
1147 | for (c = catchlist; c; c = c->next) |
1148 | { | |
1149 | if (EQ (c->tag, tag)) | |
79e8bfbf | 1150 | unwind_to_catch (c, value); |
db9f0278 | 1151 | } |
79e8bfbf | 1152 | tag = Fsignal (Qno_catch, Fcons (tag, Fcons (value, Qnil))); |
db9f0278 JB |
1153 | } |
1154 | } | |
1155 | ||
1156 | ||
1157 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1158 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1159 | If BODYFORM completes normally, its value is returned | |
1160 | after executing the UNWINDFORMS. | |
1161 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
1162 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) | |
1163 | (args) | |
db9f0278 JB |
1164 | Lisp_Object args; |
1165 | { | |
1166 | Lisp_Object val; | |
1167 | int count = specpdl_ptr - specpdl; | |
1168 | ||
1169 | record_unwind_protect (0, Fcdr (args)); | |
1170 | val = Feval (Fcar (args)); | |
1171 | return unbind_to (count, val); | |
1172 | } | |
1173 | \f | |
1174 | /* Chain of condition handlers currently in effect. | |
1175 | The elements of this chain are contained in the stack frames | |
1176 | of Fcondition_case and internal_condition_case. | |
1177 | When an error is signaled (by calling Fsignal, below), | |
1178 | this chain is searched for an element that applies. */ | |
1179 | ||
1180 | struct handler *handlerlist; | |
1181 | ||
1182 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
9dbc9081 | 1183 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1184 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1185 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1186 | where the BODY is made of Lisp expressions. | |
1187 | ||
1188 | A handler is applicable to an error | |
1189 | if CONDITION-NAME is one of the error's condition names. | |
1190 | If an error happens, the first applicable handler is run. | |
1191 | ||
1192 | The car of a handler may be a list of condition names | |
1193 | instead of a single condition name. | |
1194 | ||
1195 | When a handler handles an error, | |
1196 | control returns to the condition-case and the handler BODY... is executed | |
1197 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA). | |
1198 | VAR may be nil; then you do not get access to the signal information. | |
1199 | ||
1200 | The value of the last BODY form is returned from the condition-case. | |
1201 | See also the function `signal' for more info. | |
1202 | usage: (condition-case VAR BODYFORM HANDLERS...) */) | |
1203 | (args) | |
db9f0278 JB |
1204 | Lisp_Object args; |
1205 | { | |
1206 | Lisp_Object val; | |
1207 | struct catchtag c; | |
1208 | struct handler h; | |
17401c97 GM |
1209 | register Lisp_Object bodyform, handlers; |
1210 | volatile Lisp_Object var; | |
db9f0278 | 1211 | |
82da7701 JB |
1212 | var = Fcar (args); |
1213 | bodyform = Fcar (Fcdr (args)); | |
1214 | handlers = Fcdr (Fcdr (args)); | |
b7826503 | 1215 | CHECK_SYMBOL (var); |
82da7701 JB |
1216 | |
1217 | for (val = handlers; ! NILP (val); val = Fcdr (val)) | |
1218 | { | |
1219 | Lisp_Object tem; | |
1220 | tem = Fcar (val); | |
5f96776a RS |
1221 | if (! (NILP (tem) |
1222 | || (CONSP (tem) | |
03699b14 KR |
1223 | && (SYMBOLP (XCAR (tem)) |
1224 | || CONSP (XCAR (tem)))))) | |
82da7701 JB |
1225 | error ("Invalid condition handler", tem); |
1226 | } | |
db9f0278 JB |
1227 | |
1228 | c.tag = Qnil; | |
1229 | c.val = Qnil; | |
1230 | c.backlist = backtrace_list; | |
1231 | c.handlerlist = handlerlist; | |
1232 | c.lisp_eval_depth = lisp_eval_depth; | |
1233 | c.pdlcount = specpdl_ptr - specpdl; | |
1234 | c.poll_suppress_count = poll_suppress_count; | |
1235 | c.gcpro = gcprolist; | |
bcf28080 | 1236 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1237 | if (_setjmp (c.jmp)) |
1238 | { | |
265a9e55 | 1239 | if (!NILP (h.var)) |
9d58218c RS |
1240 | specbind (h.var, c.val); |
1241 | val = Fprogn (Fcdr (h.chosen_clause)); | |
82da7701 JB |
1242 | |
1243 | /* Note that this just undoes the binding of h.var; whoever | |
1244 | longjumped to us unwound the stack to c.pdlcount before | |
1245 | throwing. */ | |
db9f0278 JB |
1246 | unbind_to (c.pdlcount, Qnil); |
1247 | return val; | |
1248 | } | |
1249 | c.next = catchlist; | |
1250 | catchlist = &c; | |
db9f0278 | 1251 | |
82da7701 JB |
1252 | h.var = var; |
1253 | h.handler = handlers; | |
db9f0278 | 1254 | h.next = handlerlist; |
db9f0278 JB |
1255 | h.tag = &c; |
1256 | handlerlist = &h; | |
1257 | ||
82da7701 | 1258 | val = Feval (bodyform); |
db9f0278 JB |
1259 | catchlist = c.next; |
1260 | handlerlist = h.next; | |
1261 | return val; | |
1262 | } | |
1263 | ||
f029ca5f RS |
1264 | /* Call the function BFUN with no arguments, catching errors within it |
1265 | according to HANDLERS. If there is an error, call HFUN with | |
1266 | one argument which is the data that describes the error: | |
1267 | (SIGNALNAME . DATA) | |
1268 | ||
1269 | HANDLERS can be a list of conditions to catch. | |
1270 | If HANDLERS is Qt, catch all errors. | |
1271 | If HANDLERS is Qerror, catch all errors | |
1272 | but allow the debugger to run if that is enabled. */ | |
1273 | ||
db9f0278 JB |
1274 | Lisp_Object |
1275 | internal_condition_case (bfun, handlers, hfun) | |
1276 | Lisp_Object (*bfun) (); | |
1277 | Lisp_Object handlers; | |
1278 | Lisp_Object (*hfun) (); | |
1279 | { | |
1280 | Lisp_Object val; | |
1281 | struct catchtag c; | |
1282 | struct handler h; | |
1283 | ||
dccfb979 AI |
1284 | #if 0 /* Can't do this check anymore because realize_basic_faces has |
1285 | to BLOCK_INPUT, and can call Lisp. What's really needed is a | |
1286 | flag indicating that we're currently handling a signal. */ | |
01591d17 RS |
1287 | /* Since Fsignal resets this to 0, it had better be 0 now |
1288 | or else we have a potential bug. */ | |
1289 | if (interrupt_input_blocked != 0) | |
1290 | abort (); | |
dccfb979 | 1291 | #endif |
01591d17 | 1292 | |
db9f0278 JB |
1293 | c.tag = Qnil; |
1294 | c.val = Qnil; | |
1295 | c.backlist = backtrace_list; | |
1296 | c.handlerlist = handlerlist; | |
1297 | c.lisp_eval_depth = lisp_eval_depth; | |
1298 | c.pdlcount = specpdl_ptr - specpdl; | |
1299 | c.poll_suppress_count = poll_suppress_count; | |
1300 | c.gcpro = gcprolist; | |
bcf28080 | 1301 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1302 | if (_setjmp (c.jmp)) |
1303 | { | |
9d58218c | 1304 | return (*hfun) (c.val); |
db9f0278 JB |
1305 | } |
1306 | c.next = catchlist; | |
1307 | catchlist = &c; | |
1308 | h.handler = handlers; | |
1309 | h.var = Qnil; | |
db9f0278 JB |
1310 | h.next = handlerlist; |
1311 | h.tag = &c; | |
1312 | handlerlist = &h; | |
1313 | ||
1314 | val = (*bfun) (); | |
1315 | catchlist = c.next; | |
1316 | handlerlist = h.next; | |
1317 | return val; | |
1318 | } | |
1319 | ||
f029ca5f RS |
1320 | /* Like internal_condition_case but call HFUN with ARG as its argument. */ |
1321 | ||
d227775c RS |
1322 | Lisp_Object |
1323 | internal_condition_case_1 (bfun, arg, handlers, hfun) | |
1324 | Lisp_Object (*bfun) (); | |
1325 | Lisp_Object arg; | |
1326 | Lisp_Object handlers; | |
1327 | Lisp_Object (*hfun) (); | |
1328 | { | |
1329 | Lisp_Object val; | |
1330 | struct catchtag c; | |
1331 | struct handler h; | |
1332 | ||
1333 | c.tag = Qnil; | |
1334 | c.val = Qnil; | |
1335 | c.backlist = backtrace_list; | |
1336 | c.handlerlist = handlerlist; | |
1337 | c.lisp_eval_depth = lisp_eval_depth; | |
1338 | c.pdlcount = specpdl_ptr - specpdl; | |
1339 | c.poll_suppress_count = poll_suppress_count; | |
1340 | c.gcpro = gcprolist; | |
bcf28080 | 1341 | c.byte_stack = byte_stack_list; |
d227775c RS |
1342 | if (_setjmp (c.jmp)) |
1343 | { | |
9d58218c | 1344 | return (*hfun) (c.val); |
d227775c RS |
1345 | } |
1346 | c.next = catchlist; | |
1347 | catchlist = &c; | |
1348 | h.handler = handlers; | |
1349 | h.var = Qnil; | |
1350 | h.next = handlerlist; | |
1351 | h.tag = &c; | |
1352 | handlerlist = &h; | |
1353 | ||
1354 | val = (*bfun) (arg); | |
1355 | catchlist = c.next; | |
1356 | handlerlist = h.next; | |
1357 | return val; | |
1358 | } | |
10b29d41 GM |
1359 | |
1360 | ||
1361 | /* Like internal_condition_case but call HFUN with NARGS as first, | |
1362 | and ARGS as second argument. */ | |
1363 | ||
1364 | Lisp_Object | |
1365 | internal_condition_case_2 (bfun, nargs, args, handlers, hfun) | |
1366 | Lisp_Object (*bfun) (); | |
1367 | int nargs; | |
1368 | Lisp_Object *args; | |
1369 | Lisp_Object handlers; | |
1370 | Lisp_Object (*hfun) (); | |
1371 | { | |
1372 | Lisp_Object val; | |
1373 | struct catchtag c; | |
1374 | struct handler h; | |
1375 | ||
1376 | c.tag = Qnil; | |
1377 | c.val = Qnil; | |
1378 | c.backlist = backtrace_list; | |
1379 | c.handlerlist = handlerlist; | |
1380 | c.lisp_eval_depth = lisp_eval_depth; | |
1381 | c.pdlcount = specpdl_ptr - specpdl; | |
1382 | c.poll_suppress_count = poll_suppress_count; | |
1383 | c.gcpro = gcprolist; | |
1384 | c.byte_stack = byte_stack_list; | |
1385 | if (_setjmp (c.jmp)) | |
1386 | { | |
1387 | return (*hfun) (c.val); | |
1388 | } | |
1389 | c.next = catchlist; | |
1390 | catchlist = &c; | |
1391 | h.handler = handlers; | |
1392 | h.var = Qnil; | |
1393 | h.next = handlerlist; | |
1394 | h.tag = &c; | |
1395 | handlerlist = &h; | |
1396 | ||
1397 | val = (*bfun) (nargs, args); | |
1398 | catchlist = c.next; | |
1399 | handlerlist = h.next; | |
1400 | return val; | |
1401 | } | |
1402 | ||
d227775c | 1403 | \f |
2901f1d1 SM |
1404 | static Lisp_Object find_handler_clause P_ ((Lisp_Object, Lisp_Object, |
1405 | Lisp_Object, Lisp_Object, | |
1406 | Lisp_Object *)); | |
db9f0278 JB |
1407 | |
1408 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
9dbc9081 PJ |
1409 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1410 | This function does not return. | |
1411 | ||
1412 | An error symbol is a symbol with an `error-conditions' property | |
1413 | that is a list of condition names. | |
1414 | A handler for any of those names will get to handle this signal. | |
1415 | The symbol `error' should normally be one of them. | |
1416 | ||
1417 | DATA should be a list. Its elements are printed as part of the error message. | |
1418 | If the signal is handled, DATA is made available to the handler. | |
1419 | See also the function `condition-case'. */) | |
1420 | (error_symbol, data) | |
4200e719 | 1421 | Lisp_Object error_symbol, data; |
db9f0278 | 1422 | { |
bfa8ca43 AS |
1423 | /* When memory is full, ERROR-SYMBOL is nil, |
1424 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). */ | |
db9f0278 JB |
1425 | register struct handler *allhandlers = handlerlist; |
1426 | Lisp_Object conditions; | |
1427 | extern int gc_in_progress; | |
1428 | extern int waiting_for_input; | |
1429 | Lisp_Object debugger_value; | |
c11d3d17 | 1430 | Lisp_Object string; |
1ea9dec4 | 1431 | Lisp_Object real_error_symbol; |
df6c90d8 | 1432 | extern int display_hourglass_p; |
a2ff3819 | 1433 | struct backtrace *bp; |
db9f0278 | 1434 | |
346598f1 | 1435 | immediate_quit = handling_signal = 0; |
db9f0278 JB |
1436 | if (gc_in_progress || waiting_for_input) |
1437 | abort (); | |
1438 | ||
1439 | TOTALLY_UNBLOCK_INPUT; | |
1440 | ||
1ea9dec4 RS |
1441 | if (NILP (error_symbol)) |
1442 | real_error_symbol = Fcar (data); | |
1443 | else | |
1444 | real_error_symbol = error_symbol; | |
1445 | ||
48f8dfa3 | 1446 | #ifdef HAVE_X_WINDOWS |
df6c90d8 GM |
1447 | if (display_hourglass_p) |
1448 | cancel_hourglass (); | |
48f8dfa3 | 1449 | #endif |
48f8dfa3 | 1450 | |
61ede770 RS |
1451 | /* This hook is used by edebug. */ |
1452 | if (! NILP (Vsignal_hook_function)) | |
f01a9c5b | 1453 | call2 (Vsignal_hook_function, error_symbol, data); |
61ede770 | 1454 | |
1ea9dec4 | 1455 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1456 | |
a2ff3819 GM |
1457 | /* Remember from where signal was called. Skip over the frame for |
1458 | `signal' itself. If a frame for `error' follows, skip that, | |
1459 | too. */ | |
090a072f GM |
1460 | Vsignaling_function = Qnil; |
1461 | if (backtrace_list) | |
1462 | { | |
1463 | bp = backtrace_list->next; | |
1464 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1465 | bp = bp->next; | |
1466 | if (bp && bp->function) | |
1467 | Vsignaling_function = *bp->function; | |
1468 | } | |
a2ff3819 | 1469 | |
db9f0278 JB |
1470 | for (; handlerlist; handlerlist = handlerlist->next) |
1471 | { | |
1472 | register Lisp_Object clause; | |
8515044c GM |
1473 | |
1474 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1475 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1476 | ||
1477 | if (specpdl_size + 40 > max_specpdl_size) | |
1478 | max_specpdl_size = specpdl_size + 40; | |
1479 | ||
db9f0278 | 1480 | clause = find_handler_clause (handlerlist->handler, conditions, |
4200e719 | 1481 | error_symbol, data, &debugger_value); |
db9f0278 JB |
1482 | |
1483 | #if 0 /* Most callers are not prepared to handle gc if this returns. | |
1484 | So, since this feature is not very useful, take it out. */ | |
1485 | /* If have called debugger and user wants to continue, | |
1486 | just return nil. */ | |
1487 | if (EQ (clause, Qlambda)) | |
1488 | return debugger_value; | |
1489 | #else | |
1490 | if (EQ (clause, Qlambda)) | |
82da7701 | 1491 | { |
690337b7 KH |
1492 | /* We can't return values to code which signaled an error, but we |
1493 | can continue code which has signaled a quit. */ | |
1ea9dec4 | 1494 | if (EQ (real_error_symbol, Qquit)) |
82da7701 JB |
1495 | return Qnil; |
1496 | else | |
d3e6f8be | 1497 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1498 | } |
db9f0278 JB |
1499 | #endif |
1500 | ||
265a9e55 | 1501 | if (!NILP (clause)) |
db9f0278 | 1502 | { |
9d58218c | 1503 | Lisp_Object unwind_data; |
db9f0278 | 1504 | struct handler *h = handlerlist; |
9d58218c | 1505 | |
db9f0278 | 1506 | handlerlist = allhandlers; |
1ea9dec4 RS |
1507 | |
1508 | if (NILP (error_symbol)) | |
1509 | unwind_data = data; | |
9d58218c RS |
1510 | else |
1511 | unwind_data = Fcons (error_symbol, data); | |
1512 | h->chosen_clause = clause; | |
1513 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1514 | } |
1515 | } | |
1516 | ||
1517 | handlerlist = allhandlers; | |
1518 | /* If no handler is present now, try to run the debugger, | |
1519 | and if that fails, throw to top level. */ | |
4200e719 | 1520 | find_handler_clause (Qerror, conditions, error_symbol, data, &debugger_value); |
c11d3d17 RS |
1521 | if (catchlist != 0) |
1522 | Fthrow (Qtop_level, Qt); | |
1523 | ||
1ea9dec4 | 1524 | if (! NILP (error_symbol)) |
c11d3d17 RS |
1525 | data = Fcons (error_symbol, data); |
1526 | ||
1527 | string = Ferror_message_string (data); | |
377127ce | 1528 | fatal ("%s", XSTRING (string)->data, 0); |
db9f0278 JB |
1529 | } |
1530 | ||
128c0f66 RM |
1531 | /* Return nonzero iff LIST is a non-nil atom or |
1532 | a list containing one of CONDITIONS. */ | |
1533 | ||
1534 | static int | |
1535 | wants_debugger (list, conditions) | |
1536 | Lisp_Object list, conditions; | |
1537 | { | |
4de86b16 | 1538 | if (NILP (list)) |
128c0f66 RM |
1539 | return 0; |
1540 | if (! CONSP (list)) | |
1541 | return 1; | |
1542 | ||
ab67260b | 1543 | while (CONSP (conditions)) |
128c0f66 | 1544 | { |
ab67260b | 1545 | Lisp_Object this, tail; |
03699b14 KR |
1546 | this = XCAR (conditions); |
1547 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1548 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1549 | return 1; |
03699b14 | 1550 | conditions = XCDR (conditions); |
128c0f66 | 1551 | } |
ab67260b | 1552 | return 0; |
128c0f66 RM |
1553 | } |
1554 | ||
fc950e09 KH |
1555 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1556 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1557 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1558 | |
1559 | static int | |
1560 | skip_debugger (conditions, data) | |
1561 | Lisp_Object conditions, data; | |
1562 | { | |
1563 | Lisp_Object tail; | |
1564 | int first_string = 1; | |
1565 | Lisp_Object error_message; | |
1566 | ||
17401c97 GM |
1567 | error_message = Qnil; |
1568 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1569 | { |
03699b14 | 1570 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1571 | { |
1572 | if (first_string) | |
1573 | { | |
1574 | error_message = Ferror_message_string (data); | |
1575 | first_string = 0; | |
1576 | } | |
17401c97 | 1577 | |
03699b14 | 1578 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1579 | return 1; |
1580 | } | |
1581 | else | |
1582 | { | |
1583 | Lisp_Object contail; | |
1584 | ||
17401c97 | 1585 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1586 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1587 | return 1; |
1588 | } | |
1589 | } | |
1590 | ||
1591 | return 0; | |
1592 | } | |
1593 | ||
128c0f66 | 1594 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1595 | There are two ways to pass SIG and DATA: |
9b942ebd | 1596 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1597 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1598 | This is for memory-full errors only. |
1ea9dec4 | 1599 | |
128c0f66 | 1600 | Store value returned from debugger into *DEBUGGER_VALUE_PTR. */ |
db9f0278 JB |
1601 | |
1602 | static Lisp_Object | |
1603 | find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr) | |
1604 | Lisp_Object handlers, conditions, sig, data; | |
1605 | Lisp_Object *debugger_value_ptr; | |
1606 | { | |
1607 | register Lisp_Object h; | |
1608 | register Lisp_Object tem; | |
db9f0278 JB |
1609 | |
1610 | if (EQ (handlers, Qt)) /* t is used by handlers for all conditions, set up by C code. */ | |
1611 | return Qt; | |
61ede770 RS |
1612 | /* error is used similarly, but means print an error message |
1613 | and run the debugger if that is enabled. */ | |
1614 | if (EQ (handlers, Qerror) | |
57a6e758 RS |
1615 | || !NILP (Vdebug_on_signal)) /* This says call debugger even if |
1616 | there is a handler. */ | |
db9f0278 | 1617 | { |
61ede770 RS |
1618 | int count = specpdl_ptr - specpdl; |
1619 | int debugger_called = 0; | |
1ea9dec4 | 1620 | Lisp_Object sig_symbol, combined_data; |
9b942ebd RS |
1621 | /* This is set to 1 if we are handling a memory-full error, |
1622 | because these must not run the debugger. | |
1623 | (There is no room in memory to do that!) */ | |
1624 | int no_debugger = 0; | |
1ea9dec4 RS |
1625 | |
1626 | if (NILP (sig)) | |
1627 | { | |
1628 | combined_data = data; | |
1629 | sig_symbol = Fcar (data); | |
9b942ebd | 1630 | no_debugger = 1; |
1ea9dec4 RS |
1631 | } |
1632 | else | |
1633 | { | |
1634 | combined_data = Fcons (sig, data); | |
1635 | sig_symbol = sig; | |
1636 | } | |
61ede770 | 1637 | |
128c0f66 | 1638 | if (wants_debugger (Vstack_trace_on_error, conditions)) |
88817f3b | 1639 | { |
b369fa65 | 1640 | #ifdef PROTOTYPES |
88817f3b RS |
1641 | internal_with_output_to_temp_buffer ("*Backtrace*", |
1642 | (Lisp_Object (*) (Lisp_Object)) Fbacktrace, | |
1643 | Qnil); | |
1644 | #else | |
1645 | internal_with_output_to_temp_buffer ("*Backtrace*", | |
1646 | Fbacktrace, Qnil); | |
1647 | #endif | |
1648 | } | |
9b942ebd RS |
1649 | if (! no_debugger |
1650 | && (EQ (sig_symbol, Qquit) | |
1651 | ? debug_on_quit | |
1652 | : wants_debugger (Vdebug_on_error, conditions)) | |
1ea9dec4 | 1653 | && ! skip_debugger (conditions, combined_data) |
be857679 | 1654 | && when_entered_debugger < num_nonmacro_input_events) |
db9f0278 | 1655 | { |
db9f0278 | 1656 | specbind (Qdebug_on_error, Qnil); |
fc950e09 KH |
1657 | *debugger_value_ptr |
1658 | = call_debugger (Fcons (Qerror, | |
1ea9dec4 | 1659 | Fcons (combined_data, Qnil))); |
61ede770 RS |
1660 | debugger_called = 1; |
1661 | } | |
1662 | /* If there is no handler, return saying whether we ran the debugger. */ | |
1663 | if (EQ (handlers, Qerror)) | |
1664 | { | |
1665 | if (debugger_called) | |
1666 | return unbind_to (count, Qlambda); | |
1667 | return Qt; | |
db9f0278 | 1668 | } |
db9f0278 JB |
1669 | } |
1670 | for (h = handlers; CONSP (h); h = Fcdr (h)) | |
1671 | { | |
5f96776a RS |
1672 | Lisp_Object handler, condit; |
1673 | ||
1674 | handler = Fcar (h); | |
1675 | if (!CONSP (handler)) | |
db9f0278 | 1676 | continue; |
5f96776a RS |
1677 | condit = Fcar (handler); |
1678 | /* Handle a single condition name in handler HANDLER. */ | |
1679 | if (SYMBOLP (condit)) | |
1680 | { | |
1681 | tem = Fmemq (Fcar (handler), conditions); | |
1682 | if (!NILP (tem)) | |
1683 | return handler; | |
1684 | } | |
1685 | /* Handle a list of condition names in handler HANDLER. */ | |
1686 | else if (CONSP (condit)) | |
1687 | { | |
1688 | while (CONSP (condit)) | |
1689 | { | |
1690 | tem = Fmemq (Fcar (condit), conditions); | |
1691 | if (!NILP (tem)) | |
1692 | return handler; | |
03699b14 | 1693 | condit = XCDR (condit); |
5f96776a RS |
1694 | } |
1695 | } | |
db9f0278 JB |
1696 | } |
1697 | return Qnil; | |
1698 | } | |
1699 | ||
1700 | /* dump an error message; called like printf */ | |
1701 | ||
1702 | /* VARARGS 1 */ | |
1703 | void | |
1704 | error (m, a1, a2, a3) | |
1705 | char *m; | |
9125da08 | 1706 | char *a1, *a2, *a3; |
db9f0278 JB |
1707 | { |
1708 | char buf[200]; | |
9125da08 RS |
1709 | int size = 200; |
1710 | int mlen; | |
1711 | char *buffer = buf; | |
1712 | char *args[3]; | |
1713 | int allocated = 0; | |
1714 | Lisp_Object string; | |
1715 | ||
1716 | args[0] = a1; | |
1717 | args[1] = a2; | |
1718 | args[2] = a3; | |
1719 | ||
1720 | mlen = strlen (m); | |
db9f0278 JB |
1721 | |
1722 | while (1) | |
9125da08 | 1723 | { |
955f3ff9 | 1724 | int used = doprnt (buffer, size, m, m + mlen, 3, args); |
9125da08 RS |
1725 | if (used < size) |
1726 | break; | |
1727 | size *= 2; | |
1728 | if (allocated) | |
1729 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
1730 | else |
1731 | { | |
1732 | buffer = (char *) xmalloc (size); | |
1733 | allocated = 1; | |
1734 | } | |
9125da08 RS |
1735 | } |
1736 | ||
955f3ff9 | 1737 | string = build_string (buffer); |
9125da08 | 1738 | if (allocated) |
9ae6734f | 1739 | xfree (buffer); |
9125da08 RS |
1740 | |
1741 | Fsignal (Qerror, Fcons (string, Qnil)); | |
9402dba5 | 1742 | abort (); |
db9f0278 JB |
1743 | } |
1744 | \f | |
1745 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 1, 0, | |
9dbc9081 PJ |
1746 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
1747 | This means it contains a description for how to read arguments to give it. | |
1748 | The value is nil for an invalid function or a symbol with no function | |
1749 | definition. | |
1750 | ||
1751 | Interactively callable functions include strings and vectors (treated | |
1752 | as keyboard macros), lambda-expressions that contain a top-level call | |
1753 | to `interactive', autoload definitions made by `autoload' with non-nil | |
1754 | fourth argument, and some of the built-in functions of Lisp. | |
1755 | ||
1756 | Also, a symbol satisfies `commandp' if its function definition does so. */) | |
1757 | (function) | |
db9f0278 JB |
1758 | Lisp_Object function; |
1759 | { | |
1760 | register Lisp_Object fun; | |
1761 | register Lisp_Object funcar; | |
db9f0278 JB |
1762 | |
1763 | fun = function; | |
1764 | ||
ffd56f97 JB |
1765 | fun = indirect_function (fun); |
1766 | if (EQ (fun, Qunbound)) | |
1767 | return Qnil; | |
db9f0278 JB |
1768 | |
1769 | /* Emacs primitives are interactive if their DEFUN specifies an | |
1770 | interactive spec. */ | |
90165123 | 1771 | if (SUBRP (fun)) |
db9f0278 JB |
1772 | { |
1773 | if (XSUBR (fun)->prompt) | |
1774 | return Qt; | |
1775 | else | |
1776 | return Qnil; | |
1777 | } | |
1778 | ||
1779 | /* Bytecode objects are interactive if they are long enough to | |
1780 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1781 | where the interactive spec is stored. */ | |
90165123 | 1782 | else if (COMPILEDP (fun)) |
f9b4aacf | 1783 | return ((XVECTOR (fun)->size & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
db9f0278 JB |
1784 | ? Qt : Qnil); |
1785 | ||
1786 | /* Strings and vectors are keyboard macros. */ | |
90165123 | 1787 | if (STRINGP (fun) || VECTORP (fun)) |
db9f0278 JB |
1788 | return Qt; |
1789 | ||
1790 | /* Lists may represent commands. */ | |
1791 | if (!CONSP (fun)) | |
1792 | return Qnil; | |
1793 | funcar = Fcar (fun); | |
90165123 | 1794 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
1795 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
1796 | if (EQ (funcar, Qlambda)) | |
1797 | return Fassq (Qinteractive, Fcdr (Fcdr (fun))); | |
1798 | if (EQ (funcar, Qmocklisp)) | |
1799 | return Qt; /* All mocklisp functions can be called interactively */ | |
1800 | if (EQ (funcar, Qautoload)) | |
1801 | return Fcar (Fcdr (Fcdr (Fcdr (fun)))); | |
1802 | else | |
1803 | return Qnil; | |
1804 | } | |
1805 | ||
1806 | /* ARGSUSED */ | |
1807 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, | |
9dbc9081 PJ |
1808 | doc: /* Define FUNCTION to autoload from FILE. |
1809 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
1810 | Third arg DOCSTRING is documentation for the function. | |
1811 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
1812 | Fifth arg TYPE indicates the type of the object: | |
1813 | nil or omitted says FUNCTION is a function, | |
1814 | `keymap' says FUNCTION is really a keymap, and | |
1815 | `macro' or t says FUNCTION is really a macro. | |
1816 | Third through fifth args give info about the real definition. | |
1817 | They default to nil. | |
1818 | If FUNCTION is already defined other than as an autoload, | |
1819 | this does nothing and returns nil. */) | |
1820 | (function, file, docstring, interactive, type) | |
ee9ee63c | 1821 | Lisp_Object function, file, docstring, interactive, type; |
db9f0278 JB |
1822 | { |
1823 | #ifdef NO_ARG_ARRAY | |
1824 | Lisp_Object args[4]; | |
1825 | #endif | |
1826 | ||
b7826503 PJ |
1827 | CHECK_SYMBOL (function); |
1828 | CHECK_STRING (file); | |
db9f0278 JB |
1829 | |
1830 | /* If function is defined and not as an autoload, don't override */ | |
1831 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 1832 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 1833 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
1834 | return Qnil; |
1835 | ||
7973e637 SM |
1836 | if (NILP (Vpurify_flag)) |
1837 | /* Only add entries after dumping, because the ones before are | |
1838 | not useful and else we get loads of them from the loaddefs.el. */ | |
1839 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
1840 | ||
db9f0278 JB |
1841 | #ifdef NO_ARG_ARRAY |
1842 | args[0] = file; | |
1843 | args[1] = docstring; | |
1844 | args[2] = interactive; | |
ee9ee63c | 1845 | args[3] = type; |
db9f0278 JB |
1846 | |
1847 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); | |
1848 | #else /* NO_ARG_ARRAY */ | |
1849 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); | |
1850 | #endif /* not NO_ARG_ARRAY */ | |
1851 | } | |
1852 | ||
1853 | Lisp_Object | |
1854 | un_autoload (oldqueue) | |
1855 | Lisp_Object oldqueue; | |
1856 | { | |
1857 | register Lisp_Object queue, first, second; | |
1858 | ||
1859 | /* Queue to unwind is current value of Vautoload_queue. | |
1860 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1861 | queue = Vautoload_queue; | |
1862 | Vautoload_queue = oldqueue; | |
1863 | while (CONSP (queue)) | |
1864 | { | |
1865 | first = Fcar (queue); | |
1866 | second = Fcdr (first); | |
1867 | first = Fcar (first); | |
1868 | if (EQ (second, Qnil)) | |
1869 | Vfeatures = first; | |
1870 | else | |
1871 | Ffset (first, second); | |
1872 | queue = Fcdr (queue); | |
1873 | } | |
1874 | return Qnil; | |
1875 | } | |
1876 | ||
ca20916b RS |
1877 | /* Load an autoloaded function. |
1878 | FUNNAME is the symbol which is the function's name. | |
1879 | FUNDEF is the autoload definition (a list). */ | |
1880 | ||
045ba794 | 1881 | void |
db9f0278 JB |
1882 | do_autoload (fundef, funname) |
1883 | Lisp_Object fundef, funname; | |
1884 | { | |
1885 | int count = specpdl_ptr - specpdl; | |
cb81ac97 | 1886 | Lisp_Object fun, queue, first, second; |
ca20916b | 1887 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 JB |
1888 | |
1889 | fun = funname; | |
b7826503 | 1890 | CHECK_SYMBOL (funname); |
ca20916b | 1891 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 1892 | |
f87740dc RS |
1893 | /* Preserve the match data. */ |
1894 | record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil)); | |
1895 | ||
1896 | /* Value saved here is to be restored into Vautoload_queue. */ | |
db9f0278 JB |
1897 | record_unwind_protect (un_autoload, Vautoload_queue); |
1898 | Vautoload_queue = Qt; | |
4aac2302 | 1899 | Fload (Fcar (Fcdr (fundef)), Qnil, noninteractive ? Qt : Qnil, Qnil, Qt); |
2a49b6e5 | 1900 | |
f87740dc | 1901 | /* Save the old autoloads, in case we ever do an unload. */ |
2a49b6e5 RS |
1902 | queue = Vautoload_queue; |
1903 | while (CONSP (queue)) | |
1904 | { | |
1905 | first = Fcar (queue); | |
1906 | second = Fcdr (first); | |
1907 | first = Fcar (first); | |
5739ce6b ER |
1908 | |
1909 | /* Note: This test is subtle. The cdr of an autoload-queue entry | |
1910 | may be an atom if the autoload entry was generated by a defalias | |
f87740dc | 1911 | or fset. */ |
5739ce6b | 1912 | if (CONSP (second)) |
03e267c2 | 1913 | Fput (first, Qautoload, (Fcdr (second))); |
5739ce6b | 1914 | |
2a49b6e5 RS |
1915 | queue = Fcdr (queue); |
1916 | } | |
1917 | ||
db9f0278 JB |
1918 | /* Once loading finishes, don't undo it. */ |
1919 | Vautoload_queue = Qt; | |
1920 | unbind_to (count, Qnil); | |
1921 | ||
ffd56f97 JB |
1922 | fun = Findirect_function (fun); |
1923 | ||
76c2b0cc | 1924 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 JB |
1925 | error ("Autoloading failed to define function %s", |
1926 | XSYMBOL (funname)->name->data); | |
ca20916b | 1927 | UNGCPRO; |
db9f0278 | 1928 | } |
4c576a83 | 1929 | |
db9f0278 JB |
1930 | \f |
1931 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
9dbc9081 PJ |
1932 | doc: /* Evaluate FORM and return its value. */) |
1933 | (form) | |
db9f0278 JB |
1934 | Lisp_Object form; |
1935 | { | |
1936 | Lisp_Object fun, val, original_fun, original_args; | |
1937 | Lisp_Object funcar; | |
1938 | struct backtrace backtrace; | |
1939 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1940 | ||
4c576a83 | 1941 | if (handling_signal) |
48f8dfa3 GM |
1942 | abort (); |
1943 | ||
90165123 | 1944 | if (SYMBOLP (form)) |
db9f0278 JB |
1945 | { |
1946 | if (EQ (Vmocklisp_arguments, Qt)) | |
1947 | return Fsymbol_value (form); | |
1948 | val = Fsymbol_value (form); | |
265a9e55 | 1949 | if (NILP (val)) |
a631e24c | 1950 | XSETFASTINT (val, 0); |
db9f0278 | 1951 | else if (EQ (val, Qt)) |
a631e24c | 1952 | XSETFASTINT (val, 1); |
db9f0278 JB |
1953 | return val; |
1954 | } | |
1955 | if (!CONSP (form)) | |
1956 | return form; | |
1957 | ||
1958 | QUIT; | |
1959 | if (consing_since_gc > gc_cons_threshold) | |
1960 | { | |
1961 | GCPRO1 (form); | |
1962 | Fgarbage_collect (); | |
1963 | UNGCPRO; | |
1964 | } | |
1965 | ||
1966 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1967 | { | |
1968 | if (max_lisp_eval_depth < 100) | |
1969 | max_lisp_eval_depth = 100; | |
1970 | if (lisp_eval_depth > max_lisp_eval_depth) | |
1971 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
1972 | } | |
1973 | ||
1974 | original_fun = Fcar (form); | |
1975 | original_args = Fcdr (form); | |
1976 | ||
1977 | backtrace.next = backtrace_list; | |
1978 | backtrace_list = &backtrace; | |
1979 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
1980 | backtrace.args = &original_args; | |
1981 | backtrace.nargs = UNEVALLED; | |
1982 | backtrace.evalargs = 1; | |
1983 | backtrace.debug_on_exit = 0; | |
1984 | ||
1985 | if (debug_on_next_call) | |
1986 | do_debug_on_call (Qt); | |
1987 | ||
1988 | /* At this point, only original_fun and original_args | |
1989 | have values that will be used below */ | |
1990 | retry: | |
ffd56f97 | 1991 | fun = Findirect_function (original_fun); |
db9f0278 | 1992 | |
90165123 | 1993 | if (SUBRP (fun)) |
db9f0278 JB |
1994 | { |
1995 | Lisp_Object numargs; | |
166c822d | 1996 | Lisp_Object argvals[8]; |
db9f0278 JB |
1997 | Lisp_Object args_left; |
1998 | register int i, maxargs; | |
1999 | ||
2000 | args_left = original_args; | |
2001 | numargs = Flength (args_left); | |
2002 | ||
2003 | if (XINT (numargs) < XSUBR (fun)->min_args || | |
2004 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
2005 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
2006 | ||
2007 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2008 | { | |
2009 | backtrace.evalargs = 0; | |
2010 | val = (*XSUBR (fun)->function) (args_left); | |
2011 | goto done; | |
2012 | } | |
2013 | ||
2014 | if (XSUBR (fun)->max_args == MANY) | |
2015 | { | |
2016 | /* Pass a vector of evaluated arguments */ | |
2017 | Lisp_Object *vals; | |
2018 | register int argnum = 0; | |
2019 | ||
2020 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
2021 | ||
2022 | GCPRO3 (args_left, fun, fun); | |
2023 | gcpro3.var = vals; | |
2024 | gcpro3.nvars = 0; | |
2025 | ||
265a9e55 | 2026 | while (!NILP (args_left)) |
db9f0278 JB |
2027 | { |
2028 | vals[argnum++] = Feval (Fcar (args_left)); | |
2029 | args_left = Fcdr (args_left); | |
2030 | gcpro3.nvars = argnum; | |
2031 | } | |
db9f0278 JB |
2032 | |
2033 | backtrace.args = vals; | |
2034 | backtrace.nargs = XINT (numargs); | |
2035 | ||
2036 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 2037 | UNGCPRO; |
db9f0278 JB |
2038 | goto done; |
2039 | } | |
2040 | ||
2041 | GCPRO3 (args_left, fun, fun); | |
2042 | gcpro3.var = argvals; | |
2043 | gcpro3.nvars = 0; | |
2044 | ||
2045 | maxargs = XSUBR (fun)->max_args; | |
2046 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2047 | { | |
2048 | argvals[i] = Feval (Fcar (args_left)); | |
2049 | gcpro3.nvars = ++i; | |
2050 | } | |
2051 | ||
2052 | UNGCPRO; | |
2053 | ||
2054 | backtrace.args = argvals; | |
2055 | backtrace.nargs = XINT (numargs); | |
2056 | ||
2057 | switch (i) | |
2058 | { | |
2059 | case 0: | |
2060 | val = (*XSUBR (fun)->function) (); | |
2061 | goto done; | |
2062 | case 1: | |
2063 | val = (*XSUBR (fun)->function) (argvals[0]); | |
2064 | goto done; | |
2065 | case 2: | |
2066 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
2067 | goto done; | |
2068 | case 3: | |
2069 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2070 | argvals[2]); | |
2071 | goto done; | |
2072 | case 4: | |
2073 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2074 | argvals[2], argvals[3]); | |
2075 | goto done; | |
2076 | case 5: | |
2077 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2078 | argvals[3], argvals[4]); | |
2079 | goto done; | |
2080 | case 6: | |
2081 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2082 | argvals[3], argvals[4], argvals[5]); | |
2083 | goto done; | |
15c65264 RS |
2084 | case 7: |
2085 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2086 | argvals[3], argvals[4], argvals[5], | |
2087 | argvals[6]); | |
2088 | goto done; | |
db9f0278 | 2089 | |
166c822d KH |
2090 | case 8: |
2091 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2092 | argvals[3], argvals[4], argvals[5], | |
2093 | argvals[6], argvals[7]); | |
2094 | goto done; | |
2095 | ||
db9f0278 | 2096 | default: |
08564963 JB |
2097 | /* Someone has created a subr that takes more arguments than |
2098 | is supported by this code. We need to either rewrite the | |
2099 | subr to use a different argument protocol, or add more | |
2100 | cases to this switch. */ | |
2101 | abort (); | |
db9f0278 JB |
2102 | } |
2103 | } | |
90165123 | 2104 | if (COMPILEDP (fun)) |
db9f0278 JB |
2105 | val = apply_lambda (fun, original_args, 1); |
2106 | else | |
2107 | { | |
2108 | if (!CONSP (fun)) | |
2109 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2110 | funcar = Fcar (fun); | |
90165123 | 2111 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
2112 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
2113 | if (EQ (funcar, Qautoload)) | |
2114 | { | |
2115 | do_autoload (fun, original_fun); | |
2116 | goto retry; | |
2117 | } | |
2118 | if (EQ (funcar, Qmacro)) | |
2119 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
2120 | else if (EQ (funcar, Qlambda)) | |
2121 | val = apply_lambda (fun, original_args, 1); | |
2122 | else if (EQ (funcar, Qmocklisp)) | |
2123 | val = ml_apply (fun, original_args); | |
2124 | else | |
2125 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2126 | } | |
2127 | done: | |
2128 | if (!EQ (Vmocklisp_arguments, Qt)) | |
2129 | { | |
265a9e55 | 2130 | if (NILP (val)) |
a631e24c | 2131 | XSETFASTINT (val, 0); |
db9f0278 | 2132 | else if (EQ (val, Qt)) |
a631e24c | 2133 | XSETFASTINT (val, 1); |
db9f0278 JB |
2134 | } |
2135 | lisp_eval_depth--; | |
2136 | if (backtrace.debug_on_exit) | |
2137 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2138 | backtrace_list = backtrace.next; | |
2139 | return val; | |
2140 | } | |
2141 | \f | |
2142 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
9dbc9081 PJ |
2143 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2144 | Then return the value FUNCTION returns. | |
2145 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2146 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
2147 | (nargs, args) | |
db9f0278 JB |
2148 | int nargs; |
2149 | Lisp_Object *args; | |
2150 | { | |
2151 | register int i, numargs; | |
2152 | register Lisp_Object spread_arg; | |
2153 | register Lisp_Object *funcall_args; | |
db9f0278 | 2154 | Lisp_Object fun; |
a6e3fa71 | 2155 | struct gcpro gcpro1; |
db9f0278 JB |
2156 | |
2157 | fun = args [0]; | |
2158 | funcall_args = 0; | |
2159 | spread_arg = args [nargs - 1]; | |
b7826503 | 2160 | CHECK_LIST (spread_arg); |
db9f0278 JB |
2161 | |
2162 | numargs = XINT (Flength (spread_arg)); | |
2163 | ||
2164 | if (numargs == 0) | |
2165 | return Ffuncall (nargs - 1, args); | |
2166 | else if (numargs == 1) | |
2167 | { | |
03699b14 | 2168 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2169 | return Ffuncall (nargs, args); |
2170 | } | |
2171 | ||
a6e3fa71 | 2172 | numargs += nargs - 2; |
db9f0278 | 2173 | |
ffd56f97 JB |
2174 | fun = indirect_function (fun); |
2175 | if (EQ (fun, Qunbound)) | |
db9f0278 | 2176 | { |
ffd56f97 JB |
2177 | /* Let funcall get the error */ |
2178 | fun = args[0]; | |
2179 | goto funcall; | |
db9f0278 JB |
2180 | } |
2181 | ||
90165123 | 2182 | if (SUBRP (fun)) |
db9f0278 JB |
2183 | { |
2184 | if (numargs < XSUBR (fun)->min_args | |
2185 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2186 | goto funcall; /* Let funcall get the error */ | |
2187 | else if (XSUBR (fun)->max_args > numargs) | |
2188 | { | |
2189 | /* Avoid making funcall cons up a yet another new vector of arguments | |
2190 | by explicitly supplying nil's for optional values */ | |
2191 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
2192 | * sizeof (Lisp_Object)); | |
2193 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
2194 | funcall_args[++i] = Qnil; | |
a6e3fa71 JB |
2195 | GCPRO1 (*funcall_args); |
2196 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2197 | } |
2198 | } | |
2199 | funcall: | |
2200 | /* We add 1 to numargs because funcall_args includes the | |
2201 | function itself as well as its arguments. */ | |
2202 | if (!funcall_args) | |
a6e3fa71 JB |
2203 | { |
2204 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
2205 | * sizeof (Lisp_Object)); | |
2206 | GCPRO1 (*funcall_args); | |
2207 | gcpro1.nvars = 1 + numargs; | |
2208 | } | |
2209 | ||
db9f0278 JB |
2210 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
2211 | /* Spread the last arg we got. Its first element goes in | |
2212 | the slot that it used to occupy, hence this value of I. */ | |
2213 | i = nargs - 1; | |
265a9e55 | 2214 | while (!NILP (spread_arg)) |
db9f0278 | 2215 | { |
03699b14 KR |
2216 | funcall_args [i++] = XCAR (spread_arg); |
2217 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2218 | } |
a6e3fa71 JB |
2219 | |
2220 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
2221 | } |
2222 | \f | |
ff936e53 SM |
2223 | /* Run hook variables in various ways. */ |
2224 | ||
2225 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
2901f1d1 SM |
2226 | static Lisp_Object run_hook_with_args P_ ((int, Lisp_Object *, |
2227 | enum run_hooks_condition)); | |
ff936e53 | 2228 | |
8b5176cd | 2229 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9dbc9081 PJ |
2230 | doc: /* Run each hook in HOOKS. Major mode functions use this. |
2231 | Each argument should be a symbol, a hook variable. | |
2232 | These symbols are processed in the order specified. | |
2233 | If a hook symbol has a non-nil value, that value may be a function | |
2234 | or a list of functions to be called to run the hook. | |
2235 | If the value is a function, it is called with no arguments. | |
2236 | If it is a list, the elements are called, in order, with no arguments. | |
2237 | ||
72e85d5d RS |
2238 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2239 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2240 | usage: (run-hooks &rest HOOKS) */) |
2241 | (nargs, args) | |
ff936e53 SM |
2242 | int nargs; |
2243 | Lisp_Object *args; | |
2244 | { | |
2245 | Lisp_Object hook[1]; | |
2246 | register int i; | |
2247 | ||
2248 | for (i = 0; i < nargs; i++) | |
2249 | { | |
2250 | hook[0] = args[i]; | |
2251 | run_hook_with_args (1, hook, to_completion); | |
2252 | } | |
2253 | ||
2254 | return Qnil; | |
2255 | } | |
2256 | ||
a0d76c27 | 2257 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2258 | Srun_hook_with_args, 1, MANY, 0, |
2259 | doc: /* Run HOOK with the specified arguments ARGS. | |
2260 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2261 | value, that value may be a function or a list of functions to be | |
2262 | called to run the hook. If the value is a function, it is called with | |
2263 | the given arguments and its return value is returned. If it is a list | |
2264 | of functions, those functions are called, in order, | |
2265 | with the given arguments ARGS. | |
2266 | It is best not to depend on the value return by `run-hook-with-args', | |
2267 | as that may change. | |
2268 | ||
72e85d5d RS |
2269 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2270 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2271 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
2272 | (nargs, args) | |
ff936e53 SM |
2273 | int nargs; |
2274 | Lisp_Object *args; | |
2275 | { | |
2276 | return run_hook_with_args (nargs, args, to_completion); | |
2277 | } | |
2278 | ||
a0d76c27 | 2279 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2280 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2281 | doc: /* Run HOOK with the specified arguments ARGS. | |
2282 | HOOK should be a symbol, a hook variable. Its value should | |
2283 | be a list of functions. We call those functions, one by one, | |
2284 | passing arguments ARGS to each of them, until one of them | |
2285 | returns a non-nil value. Then we return that value. | |
2286 | If all the functions return nil, we return nil. | |
2287 | ||
72e85d5d RS |
2288 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2289 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2290 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
2291 | (nargs, args) | |
b0b667cb KH |
2292 | int nargs; |
2293 | Lisp_Object *args; | |
2294 | { | |
ff936e53 SM |
2295 | return run_hook_with_args (nargs, args, until_success); |
2296 | } | |
2297 | ||
a0d76c27 | 2298 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2299 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2300 | doc: /* Run HOOK with the specified arguments ARGS. | |
2301 | HOOK should be a symbol, a hook variable. Its value should | |
2302 | be a list of functions. We call those functions, one by one, | |
2303 | passing arguments ARGS to each of them, until one of them | |
2304 | returns nil. Then we return nil. | |
2305 | If all the functions return non-nil, we return non-nil. | |
2306 | ||
72e85d5d RS |
2307 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2308 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2309 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
2310 | (nargs, args) | |
ff936e53 SM |
2311 | int nargs; |
2312 | Lisp_Object *args; | |
2313 | { | |
2314 | return run_hook_with_args (nargs, args, until_failure); | |
2315 | } | |
2316 | ||
c933ea05 RS |
2317 | /* ARGS[0] should be a hook symbol. |
2318 | Call each of the functions in the hook value, passing each of them | |
2319 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2320 | COND specifies a condition to test after each call | |
2321 | to decide whether to stop. | |
2322 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2323 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2324 | ||
2901f1d1 | 2325 | static Lisp_Object |
ff936e53 SM |
2326 | run_hook_with_args (nargs, args, cond) |
2327 | int nargs; | |
2328 | Lisp_Object *args; | |
2329 | enum run_hooks_condition cond; | |
2330 | { | |
2331 | Lisp_Object sym, val, ret; | |
fada05d6 KH |
2332 | Lisp_Object globals; |
2333 | struct gcpro gcpro1, gcpro2, gcpro3; | |
b0b667cb | 2334 | |
f029ca5f RS |
2335 | /* If we are dying or still initializing, |
2336 | don't do anything--it would probably crash if we tried. */ | |
2337 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2338 | return Qnil; |
f029ca5f | 2339 | |
b0b667cb | 2340 | sym = args[0]; |
aa681b51 | 2341 | val = find_symbol_value (sym); |
ff936e53 SM |
2342 | ret = (cond == until_failure ? Qt : Qnil); |
2343 | ||
b0b667cb | 2344 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2345 | return ret; |
03699b14 | 2346 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2347 | { |
2348 | args[0] = val; | |
2349 | return Ffuncall (nargs, args); | |
2350 | } | |
2351 | else | |
2352 | { | |
fada05d6 KH |
2353 | globals = Qnil; |
2354 | GCPRO3 (sym, val, globals); | |
cb9d21f8 | 2355 | |
ff936e53 SM |
2356 | for (; |
2357 | CONSP (val) && ((cond == to_completion) | |
2358 | || (cond == until_success ? NILP (ret) | |
2359 | : !NILP (ret))); | |
03699b14 | 2360 | val = XCDR (val)) |
b0b667cb | 2361 | { |
03699b14 | 2362 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2363 | { |
2364 | /* t indicates this hook has a local binding; | |
2365 | it means to run the global binding too. */ | |
b0b667cb | 2366 | |
ff936e53 SM |
2367 | for (globals = Fdefault_value (sym); |
2368 | CONSP (globals) && ((cond == to_completion) | |
2369 | || (cond == until_success ? NILP (ret) | |
2370 | : !NILP (ret))); | |
03699b14 | 2371 | globals = XCDR (globals)) |
b0b667cb | 2372 | { |
03699b14 | 2373 | args[0] = XCAR (globals); |
77d92e05 RS |
2374 | /* In a global value, t should not occur. If it does, we |
2375 | must ignore it to avoid an endless loop. */ | |
2376 | if (!EQ (args[0], Qt)) | |
2377 | ret = Ffuncall (nargs, args); | |
b0b667cb KH |
2378 | } |
2379 | } | |
2380 | else | |
2381 | { | |
03699b14 | 2382 | args[0] = XCAR (val); |
ff936e53 | 2383 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2384 | } |
2385 | } | |
cb9d21f8 RS |
2386 | |
2387 | UNGCPRO; | |
ff936e53 | 2388 | return ret; |
b0b667cb KH |
2389 | } |
2390 | } | |
c933ea05 RS |
2391 | |
2392 | /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual | |
2393 | present value of that symbol. | |
2394 | Call each element of FUNLIST, | |
2395 | passing each of them the rest of ARGS. | |
2396 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2397 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2398 | ||
2399 | Lisp_Object | |
2400 | run_hook_list_with_args (funlist, nargs, args) | |
2401 | Lisp_Object funlist; | |
2402 | int nargs; | |
2403 | Lisp_Object *args; | |
2404 | { | |
2405 | Lisp_Object sym; | |
2406 | Lisp_Object val; | |
fada05d6 KH |
2407 | Lisp_Object globals; |
2408 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c933ea05 RS |
2409 | |
2410 | sym = args[0]; | |
fada05d6 KH |
2411 | globals = Qnil; |
2412 | GCPRO3 (sym, val, globals); | |
c933ea05 | 2413 | |
03699b14 | 2414 | for (val = funlist; CONSP (val); val = XCDR (val)) |
c933ea05 | 2415 | { |
03699b14 | 2416 | if (EQ (XCAR (val), Qt)) |
c933ea05 RS |
2417 | { |
2418 | /* t indicates this hook has a local binding; | |
2419 | it means to run the global binding too. */ | |
c933ea05 RS |
2420 | |
2421 | for (globals = Fdefault_value (sym); | |
2422 | CONSP (globals); | |
03699b14 | 2423 | globals = XCDR (globals)) |
c933ea05 | 2424 | { |
03699b14 | 2425 | args[0] = XCAR (globals); |
77d92e05 RS |
2426 | /* In a global value, t should not occur. If it does, we |
2427 | must ignore it to avoid an endless loop. */ | |
2428 | if (!EQ (args[0], Qt)) | |
2429 | Ffuncall (nargs, args); | |
c933ea05 RS |
2430 | } |
2431 | } | |
2432 | else | |
2433 | { | |
03699b14 | 2434 | args[0] = XCAR (val); |
c933ea05 RS |
2435 | Ffuncall (nargs, args); |
2436 | } | |
2437 | } | |
2438 | UNGCPRO; | |
2439 | return Qnil; | |
2440 | } | |
7d48558f RS |
2441 | |
2442 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ | |
2443 | ||
2444 | void | |
2445 | run_hook_with_args_2 (hook, arg1, arg2) | |
2446 | Lisp_Object hook, arg1, arg2; | |
2447 | { | |
2448 | Lisp_Object temp[3]; | |
2449 | temp[0] = hook; | |
2450 | temp[1] = arg1; | |
2451 | temp[2] = arg2; | |
2452 | ||
2453 | Frun_hook_with_args (3, temp); | |
2454 | } | |
ff936e53 | 2455 | \f |
db9f0278 JB |
2456 | /* Apply fn to arg */ |
2457 | Lisp_Object | |
2458 | apply1 (fn, arg) | |
2459 | Lisp_Object fn, arg; | |
2460 | { | |
a6e3fa71 JB |
2461 | struct gcpro gcpro1; |
2462 | ||
2463 | GCPRO1 (fn); | |
265a9e55 | 2464 | if (NILP (arg)) |
a6e3fa71 JB |
2465 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2466 | gcpro1.nvars = 2; | |
db9f0278 JB |
2467 | #ifdef NO_ARG_ARRAY |
2468 | { | |
2469 | Lisp_Object args[2]; | |
2470 | args[0] = fn; | |
2471 | args[1] = arg; | |
a6e3fa71 JB |
2472 | gcpro1.var = args; |
2473 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 JB |
2474 | } |
2475 | #else /* not NO_ARG_ARRAY */ | |
a6e3fa71 | 2476 | RETURN_UNGCPRO (Fapply (2, &fn)); |
db9f0278 JB |
2477 | #endif /* not NO_ARG_ARRAY */ |
2478 | } | |
2479 | ||
2480 | /* Call function fn on no arguments */ | |
2481 | Lisp_Object | |
2482 | call0 (fn) | |
2483 | Lisp_Object fn; | |
2484 | { | |
a6e3fa71 JB |
2485 | struct gcpro gcpro1; |
2486 | ||
2487 | GCPRO1 (fn); | |
2488 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2489 | } |
2490 | ||
15285f9f | 2491 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2492 | /* ARGSUSED */ |
2493 | Lisp_Object | |
15285f9f RS |
2494 | call1 (fn, arg1) |
2495 | Lisp_Object fn, arg1; | |
db9f0278 | 2496 | { |
a6e3fa71 | 2497 | struct gcpro gcpro1; |
db9f0278 | 2498 | #ifdef NO_ARG_ARRAY |
a6e3fa71 JB |
2499 | Lisp_Object args[2]; |
2500 | ||
db9f0278 | 2501 | args[0] = fn; |
15285f9f | 2502 | args[1] = arg1; |
a6e3fa71 JB |
2503 | GCPRO1 (args[0]); |
2504 | gcpro1.nvars = 2; | |
2505 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 | 2506 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2507 | GCPRO1 (fn); |
2508 | gcpro1.nvars = 2; | |
2509 | RETURN_UNGCPRO (Ffuncall (2, &fn)); | |
db9f0278 JB |
2510 | #endif /* not NO_ARG_ARRAY */ |
2511 | } | |
2512 | ||
15285f9f | 2513 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2514 | /* ARGSUSED */ |
2515 | Lisp_Object | |
15285f9f RS |
2516 | call2 (fn, arg1, arg2) |
2517 | Lisp_Object fn, arg1, arg2; | |
db9f0278 | 2518 | { |
a6e3fa71 | 2519 | struct gcpro gcpro1; |
db9f0278 JB |
2520 | #ifdef NO_ARG_ARRAY |
2521 | Lisp_Object args[3]; | |
2522 | args[0] = fn; | |
15285f9f RS |
2523 | args[1] = arg1; |
2524 | args[2] = arg2; | |
a6e3fa71 JB |
2525 | GCPRO1 (args[0]); |
2526 | gcpro1.nvars = 3; | |
2527 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 | 2528 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2529 | GCPRO1 (fn); |
2530 | gcpro1.nvars = 3; | |
2531 | RETURN_UNGCPRO (Ffuncall (3, &fn)); | |
db9f0278 JB |
2532 | #endif /* not NO_ARG_ARRAY */ |
2533 | } | |
2534 | ||
15285f9f | 2535 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2536 | /* ARGSUSED */ |
2537 | Lisp_Object | |
15285f9f RS |
2538 | call3 (fn, arg1, arg2, arg3) |
2539 | Lisp_Object fn, arg1, arg2, arg3; | |
db9f0278 | 2540 | { |
a6e3fa71 | 2541 | struct gcpro gcpro1; |
db9f0278 JB |
2542 | #ifdef NO_ARG_ARRAY |
2543 | Lisp_Object args[4]; | |
2544 | args[0] = fn; | |
15285f9f RS |
2545 | args[1] = arg1; |
2546 | args[2] = arg2; | |
2547 | args[3] = arg3; | |
a6e3fa71 JB |
2548 | GCPRO1 (args[0]); |
2549 | gcpro1.nvars = 4; | |
2550 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 | 2551 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2552 | GCPRO1 (fn); |
2553 | gcpro1.nvars = 4; | |
2554 | RETURN_UNGCPRO (Ffuncall (4, &fn)); | |
db9f0278 JB |
2555 | #endif /* not NO_ARG_ARRAY */ |
2556 | } | |
2557 | ||
15285f9f | 2558 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2559 | /* ARGSUSED */ |
2560 | Lisp_Object | |
15285f9f RS |
2561 | call4 (fn, arg1, arg2, arg3, arg4) |
2562 | Lisp_Object fn, arg1, arg2, arg3, arg4; | |
a5a44b91 JB |
2563 | { |
2564 | struct gcpro gcpro1; | |
2565 | #ifdef NO_ARG_ARRAY | |
2566 | Lisp_Object args[5]; | |
2567 | args[0] = fn; | |
15285f9f RS |
2568 | args[1] = arg1; |
2569 | args[2] = arg2; | |
2570 | args[3] = arg3; | |
2571 | args[4] = arg4; | |
a5a44b91 JB |
2572 | GCPRO1 (args[0]); |
2573 | gcpro1.nvars = 5; | |
2574 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
2575 | #else /* not NO_ARG_ARRAY */ | |
2576 | GCPRO1 (fn); | |
2577 | gcpro1.nvars = 5; | |
2578 | RETURN_UNGCPRO (Ffuncall (5, &fn)); | |
2579 | #endif /* not NO_ARG_ARRAY */ | |
2580 | } | |
2581 | ||
15285f9f RS |
2582 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2583 | /* ARGSUSED */ | |
2584 | Lisp_Object | |
2585 | call5 (fn, arg1, arg2, arg3, arg4, arg5) | |
2586 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5; | |
2587 | { | |
2588 | struct gcpro gcpro1; | |
2589 | #ifdef NO_ARG_ARRAY | |
2590 | Lisp_Object args[6]; | |
2591 | args[0] = fn; | |
2592 | args[1] = arg1; | |
2593 | args[2] = arg2; | |
2594 | args[3] = arg3; | |
2595 | args[4] = arg4; | |
2596 | args[5] = arg5; | |
2597 | GCPRO1 (args[0]); | |
2598 | gcpro1.nvars = 6; | |
2599 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
2600 | #else /* not NO_ARG_ARRAY */ | |
2601 | GCPRO1 (fn); | |
2602 | gcpro1.nvars = 6; | |
2603 | RETURN_UNGCPRO (Ffuncall (6, &fn)); | |
2604 | #endif /* not NO_ARG_ARRAY */ | |
2605 | } | |
2606 | ||
2607 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2608 | /* ARGSUSED */ | |
2609 | Lisp_Object | |
2610 | call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6) | |
2611 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6; | |
2612 | { | |
2613 | struct gcpro gcpro1; | |
2614 | #ifdef NO_ARG_ARRAY | |
2615 | Lisp_Object args[7]; | |
2616 | args[0] = fn; | |
2617 | args[1] = arg1; | |
2618 | args[2] = arg2; | |
2619 | args[3] = arg3; | |
2620 | args[4] = arg4; | |
2621 | args[5] = arg5; | |
2622 | args[6] = arg6; | |
2623 | GCPRO1 (args[0]); | |
2624 | gcpro1.nvars = 7; | |
2625 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
2626 | #else /* not NO_ARG_ARRAY */ | |
2627 | GCPRO1 (fn); | |
2628 | gcpro1.nvars = 7; | |
2629 | RETURN_UNGCPRO (Ffuncall (7, &fn)); | |
2630 | #endif /* not NO_ARG_ARRAY */ | |
2631 | } | |
2632 | ||
db9f0278 | 2633 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2634 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2635 | Return the value that function returns. | |
2636 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2637 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
2638 | (nargs, args) | |
db9f0278 JB |
2639 | int nargs; |
2640 | Lisp_Object *args; | |
2641 | { | |
2642 | Lisp_Object fun; | |
2643 | Lisp_Object funcar; | |
2644 | int numargs = nargs - 1; | |
2645 | Lisp_Object lisp_numargs; | |
2646 | Lisp_Object val; | |
2647 | struct backtrace backtrace; | |
2648 | register Lisp_Object *internal_args; | |
2649 | register int i; | |
2650 | ||
2651 | QUIT; | |
2652 | if (consing_since_gc > gc_cons_threshold) | |
a6e3fa71 | 2653 | Fgarbage_collect (); |
db9f0278 JB |
2654 | |
2655 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2656 | { | |
2657 | if (max_lisp_eval_depth < 100) | |
2658 | max_lisp_eval_depth = 100; | |
2659 | if (lisp_eval_depth > max_lisp_eval_depth) | |
2660 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
2661 | } | |
2662 | ||
2663 | backtrace.next = backtrace_list; | |
2664 | backtrace_list = &backtrace; | |
2665 | backtrace.function = &args[0]; | |
2666 | backtrace.args = &args[1]; | |
2667 | backtrace.nargs = nargs - 1; | |
2668 | backtrace.evalargs = 0; | |
2669 | backtrace.debug_on_exit = 0; | |
2670 | ||
2671 | if (debug_on_next_call) | |
2672 | do_debug_on_call (Qlambda); | |
2673 | ||
2674 | retry: | |
2675 | ||
2676 | fun = args[0]; | |
ffd56f97 JB |
2677 | |
2678 | fun = Findirect_function (fun); | |
db9f0278 | 2679 | |
90165123 | 2680 | if (SUBRP (fun)) |
db9f0278 JB |
2681 | { |
2682 | if (numargs < XSUBR (fun)->min_args | |
2683 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2684 | { | |
a631e24c | 2685 | XSETFASTINT (lisp_numargs, numargs); |
db9f0278 JB |
2686 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (lisp_numargs, Qnil))); |
2687 | } | |
2688 | ||
2689 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2690 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2691 | ||
2692 | if (XSUBR (fun)->max_args == MANY) | |
2693 | { | |
2694 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
2695 | goto done; | |
2696 | } | |
2697 | ||
2698 | if (XSUBR (fun)->max_args > numargs) | |
2699 | { | |
2700 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
2701 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
2702 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
2703 | internal_args[i] = Qnil; | |
2704 | } | |
2705 | else | |
2706 | internal_args = args + 1; | |
2707 | switch (XSUBR (fun)->max_args) | |
2708 | { | |
2709 | case 0: | |
2710 | val = (*XSUBR (fun)->function) (); | |
2711 | goto done; | |
2712 | case 1: | |
2713 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
2714 | goto done; | |
2715 | case 2: | |
2716 | val = (*XSUBR (fun)->function) (internal_args[0], | |
2717 | internal_args[1]); | |
2718 | goto done; | |
2719 | case 3: | |
2720 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2721 | internal_args[2]); | |
2722 | goto done; | |
2723 | case 4: | |
2724 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2725 | internal_args[2], | |
2726 | internal_args[3]); | |
2727 | goto done; | |
2728 | case 5: | |
2729 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2730 | internal_args[2], internal_args[3], | |
2731 | internal_args[4]); | |
2732 | goto done; | |
2733 | case 6: | |
2734 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2735 | internal_args[2], internal_args[3], | |
2736 | internal_args[4], internal_args[5]); | |
2737 | goto done; | |
15c65264 RS |
2738 | case 7: |
2739 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2740 | internal_args[2], internal_args[3], | |
2741 | internal_args[4], internal_args[5], | |
2742 | internal_args[6]); | |
2743 | goto done; | |
db9f0278 | 2744 | |
166c822d KH |
2745 | case 8: |
2746 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2747 | internal_args[2], internal_args[3], | |
2748 | internal_args[4], internal_args[5], | |
2749 | internal_args[6], internal_args[7]); | |
2750 | goto done; | |
2751 | ||
db9f0278 | 2752 | default: |
70ee42f7 | 2753 | |
166c822d | 2754 | /* If a subr takes more than 8 arguments without using MANY |
70ee42f7 JB |
2755 | or UNEVALLED, we need to extend this function to support it. |
2756 | Until this is done, there is no way to call the function. */ | |
2757 | abort (); | |
db9f0278 JB |
2758 | } |
2759 | } | |
90165123 | 2760 | if (COMPILEDP (fun)) |
db9f0278 JB |
2761 | val = funcall_lambda (fun, numargs, args + 1); |
2762 | else | |
2763 | { | |
2764 | if (!CONSP (fun)) | |
2765 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2766 | funcar = Fcar (fun); | |
90165123 | 2767 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
2768 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
2769 | if (EQ (funcar, Qlambda)) | |
2770 | val = funcall_lambda (fun, numargs, args + 1); | |
2771 | else if (EQ (funcar, Qmocklisp)) | |
2772 | val = ml_apply (fun, Flist (numargs, args + 1)); | |
2773 | else if (EQ (funcar, Qautoload)) | |
2774 | { | |
2775 | do_autoload (fun, args[0]); | |
2776 | goto retry; | |
2777 | } | |
2778 | else | |
2779 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2780 | } | |
2781 | done: | |
2782 | lisp_eval_depth--; | |
2783 | if (backtrace.debug_on_exit) | |
2784 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2785 | backtrace_list = backtrace.next; | |
2786 | return val; | |
2787 | } | |
2788 | \f | |
2789 | Lisp_Object | |
2790 | apply_lambda (fun, args, eval_flag) | |
2791 | Lisp_Object fun, args; | |
2792 | int eval_flag; | |
2793 | { | |
2794 | Lisp_Object args_left; | |
2795 | Lisp_Object numargs; | |
2796 | register Lisp_Object *arg_vector; | |
2797 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2798 | register int i; | |
2799 | register Lisp_Object tem; | |
2800 | ||
2801 | numargs = Flength (args); | |
2802 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
2803 | args_left = args; | |
2804 | ||
2805 | GCPRO3 (*arg_vector, args_left, fun); | |
2806 | gcpro1.nvars = 0; | |
2807 | ||
2808 | for (i = 0; i < XINT (numargs);) | |
2809 | { | |
2810 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
2811 | if (eval_flag) tem = Feval (tem); | |
2812 | arg_vector[i++] = tem; | |
2813 | gcpro1.nvars = i; | |
2814 | } | |
2815 | ||
2816 | UNGCPRO; | |
2817 | ||
2818 | if (eval_flag) | |
2819 | { | |
2820 | backtrace_list->args = arg_vector; | |
2821 | backtrace_list->nargs = i; | |
2822 | } | |
2823 | backtrace_list->evalargs = 0; | |
2824 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
2825 | ||
2826 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2827 | if (backtrace_list->debug_on_exit) | |
2828 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
2829 | /* Don't do it again when we return to eval. */ | |
2830 | backtrace_list->debug_on_exit = 0; | |
2831 | return tem; | |
2832 | } | |
2833 | ||
2834 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2835 | and return the result of evaluation. | |
2836 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2837 | ||
2901f1d1 | 2838 | static Lisp_Object |
db9f0278 JB |
2839 | funcall_lambda (fun, nargs, arg_vector) |
2840 | Lisp_Object fun; | |
2841 | int nargs; | |
2842 | register Lisp_Object *arg_vector; | |
2843 | { | |
9ab90667 | 2844 | Lisp_Object val, syms_left, next; |
db9f0278 | 2845 | int count = specpdl_ptr - specpdl; |
9ab90667 | 2846 | int i, optional, rest; |
db9f0278 | 2847 | |
9ab90667 GM |
2848 | if (NILP (Vmocklisp_arguments)) |
2849 | specbind (Qmocklisp_arguments, Qt); /* t means NOT mocklisp! */ | |
db9f0278 | 2850 | |
90165123 | 2851 | if (CONSP (fun)) |
9ab90667 GM |
2852 | { |
2853 | syms_left = XCDR (fun); | |
2854 | if (CONSP (syms_left)) | |
2855 | syms_left = XCAR (syms_left); | |
2856 | else | |
2857 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2858 | } | |
90165123 | 2859 | else if (COMPILEDP (fun)) |
db9f0278 | 2860 | syms_left = XVECTOR (fun)->contents[COMPILED_ARGLIST]; |
9ab90667 GM |
2861 | else |
2862 | abort (); | |
db9f0278 | 2863 | |
9ab90667 GM |
2864 | i = optional = rest = 0; |
2865 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
2866 | { |
2867 | QUIT; | |
9ab90667 GM |
2868 | |
2869 | next = XCAR (syms_left); | |
90165123 | 2870 | while (!SYMBOLP (next)) |
9ffa21d4 | 2871 | next = Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
9ab90667 | 2872 | |
db9f0278 JB |
2873 | if (EQ (next, Qand_rest)) |
2874 | rest = 1; | |
2875 | else if (EQ (next, Qand_optional)) | |
2876 | optional = 1; | |
2877 | else if (rest) | |
2878 | { | |
9ffa21d4 | 2879 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
2880 | i = nargs; |
2881 | } | |
2882 | else if (i < nargs) | |
9ab90667 | 2883 | specbind (next, arg_vector[i++]); |
db9f0278 | 2884 | else if (!optional) |
9ab90667 GM |
2885 | return Fsignal (Qwrong_number_of_arguments, |
2886 | Fcons (fun, Fcons (make_number (nargs), Qnil))); | |
db9f0278 JB |
2887 | else |
2888 | specbind (next, Qnil); | |
2889 | } | |
2890 | ||
9ab90667 GM |
2891 | if (!NILP (syms_left)) |
2892 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2893 | else if (i < nargs) | |
2894 | return Fsignal (Qwrong_number_of_arguments, | |
2895 | Fcons (fun, Fcons (make_number (nargs), Qnil))); | |
db9f0278 | 2896 | |
90165123 | 2897 | if (CONSP (fun)) |
9ab90667 | 2898 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 2899 | else |
ca248607 RS |
2900 | { |
2901 | /* If we have not actually read the bytecode string | |
2902 | and constants vector yet, fetch them from the file. */ | |
2903 | if (CONSP (XVECTOR (fun)->contents[COMPILED_BYTECODE])) | |
661c7d6e | 2904 | Ffetch_bytecode (fun); |
ca248607 RS |
2905 | val = Fbyte_code (XVECTOR (fun)->contents[COMPILED_BYTECODE], |
2906 | XVECTOR (fun)->contents[COMPILED_CONSTANTS], | |
2907 | XVECTOR (fun)->contents[COMPILED_STACK_DEPTH]); | |
2908 | } | |
9ab90667 | 2909 | |
db9f0278 JB |
2910 | return unbind_to (count, val); |
2911 | } | |
661c7d6e KH |
2912 | |
2913 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
2914 | 1, 1, 0, |
2915 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
2916 | (object) | |
661c7d6e KH |
2917 | Lisp_Object object; |
2918 | { | |
2919 | Lisp_Object tem; | |
2920 | ||
2921 | if (COMPILEDP (object) | |
2922 | && CONSP (XVECTOR (object)->contents[COMPILED_BYTECODE])) | |
2923 | { | |
2924 | tem = read_doc_string (XVECTOR (object)->contents[COMPILED_BYTECODE]); | |
5bbdb090 RS |
2925 | if (!CONSP (tem)) |
2926 | error ("invalid byte code"); | |
03699b14 KR |
2927 | XVECTOR (object)->contents[COMPILED_BYTECODE] = XCAR (tem); |
2928 | XVECTOR (object)->contents[COMPILED_CONSTANTS] = XCDR (tem); | |
661c7d6e KH |
2929 | } |
2930 | return object; | |
2931 | } | |
db9f0278 JB |
2932 | \f |
2933 | void | |
2934 | grow_specpdl () | |
2935 | { | |
2936 | register int count = specpdl_ptr - specpdl; | |
2937 | if (specpdl_size >= max_specpdl_size) | |
2938 | { | |
2939 | if (max_specpdl_size < 400) | |
2940 | max_specpdl_size = 400; | |
2941 | if (specpdl_size >= max_specpdl_size) | |
2942 | { | |
debee8fe RS |
2943 | if (!NILP (Vdebug_on_error)) |
2944 | /* Leave room for some specpdl in the debugger. */ | |
2945 | max_specpdl_size = specpdl_size + 100; | |
db9f0278 JB |
2946 | Fsignal (Qerror, |
2947 | Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil)); | |
db9f0278 JB |
2948 | } |
2949 | } | |
2950 | specpdl_size *= 2; | |
2951 | if (specpdl_size > max_specpdl_size) | |
2952 | specpdl_size = max_specpdl_size; | |
2953 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
2954 | specpdl_ptr = specpdl + count; | |
2955 | } | |
2956 | ||
2957 | void | |
2958 | specbind (symbol, value) | |
2959 | Lisp_Object symbol, value; | |
2960 | { | |
db9f0278 | 2961 | Lisp_Object ovalue; |
19cebf5a | 2962 | Lisp_Object valcontents; |
db9f0278 | 2963 | |
b7826503 | 2964 | CHECK_SYMBOL (symbol); |
db9f0278 JB |
2965 | if (specpdl_ptr == specpdl + specpdl_size) |
2966 | grow_specpdl (); | |
719177b3 | 2967 | |
19cebf5a GM |
2968 | /* The most common case is that of a non-constant symbol with a |
2969 | trivial value. Make that as fast as we can. */ | |
2970 | valcontents = SYMBOL_VALUE (symbol); | |
2971 | if (!MISCP (valcontents) && !SYMBOL_CONSTANT_P (symbol)) | |
719177b3 | 2972 | { |
9ab90667 | 2973 | specpdl_ptr->symbol = symbol; |
19cebf5a | 2974 | specpdl_ptr->old_value = valcontents; |
9ab90667 GM |
2975 | specpdl_ptr->func = NULL; |
2976 | ++specpdl_ptr; | |
19cebf5a | 2977 | SET_SYMBOL_VALUE (symbol, value); |
719177b3 RS |
2978 | } |
2979 | else | |
9ab90667 | 2980 | { |
eb700b82 GM |
2981 | Lisp_Object valcontents; |
2982 | ||
9ab90667 GM |
2983 | ovalue = find_symbol_value (symbol); |
2984 | specpdl_ptr->func = 0; | |
2985 | specpdl_ptr->old_value = ovalue; | |
719177b3 | 2986 | |
eb700b82 GM |
2987 | valcontents = XSYMBOL (symbol)->value; |
2988 | ||
2989 | if (BUFFER_LOCAL_VALUEP (valcontents) | |
2990 | || SOME_BUFFER_LOCAL_VALUEP (valcontents) | |
2991 | || BUFFER_OBJFWDP (valcontents)) | |
9ab90667 | 2992 | { |
0967b4b0 GM |
2993 | Lisp_Object where, current_buffer; |
2994 | ||
2995 | current_buffer = Fcurrent_buffer (); | |
06bccf8e | 2996 | |
9ab90667 | 2997 | /* For a local variable, record both the symbol and which |
eb700b82 GM |
2998 | buffer's or frame's value we are saving. */ |
2999 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
0967b4b0 | 3000 | where = current_buffer; |
eb700b82 GM |
3001 | else if (!BUFFER_OBJFWDP (valcontents) |
3002 | && XBUFFER_LOCAL_VALUE (valcontents)->found_for_frame) | |
3003 | where = XBUFFER_LOCAL_VALUE (valcontents)->frame; | |
3004 | else | |
3005 | where = Qnil; | |
3006 | ||
3007 | /* We're not using the `unused' slot in the specbinding | |
3008 | structure because this would mean we have to do more | |
3009 | work for simple variables. */ | |
0967b4b0 | 3010 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, current_buffer)); |
06bccf8e GM |
3011 | |
3012 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3013 | buffer-local value here, make the `let' change the global | |
3014 | value by changing the value of SYMBOL in all buffers not | |
3015 | having their own value. This is consistent with what | |
3016 | happens with other buffer-local variables. */ | |
eb700b82 GM |
3017 | if (NILP (where) |
3018 | && BUFFER_OBJFWDP (valcontents)) | |
06bccf8e GM |
3019 | { |
3020 | ++specpdl_ptr; | |
3021 | Fset_default (symbol, value); | |
3022 | return; | |
3023 | } | |
9ab90667 GM |
3024 | } |
3025 | else | |
3026 | specpdl_ptr->symbol = symbol; | |
3027 | ||
3028 | specpdl_ptr++; | |
3029 | if (BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue)) | |
eae0e123 | 3030 | store_symval_forwarding (symbol, ovalue, value, NULL); |
9ab90667 GM |
3031 | else |
3032 | set_internal (symbol, value, 0, 1); | |
3033 | } | |
db9f0278 JB |
3034 | } |
3035 | ||
3036 | void | |
3037 | record_unwind_protect (function, arg) | |
1d159538 | 3038 | Lisp_Object (*function) P_ ((Lisp_Object)); |
db9f0278 JB |
3039 | Lisp_Object arg; |
3040 | { | |
3041 | if (specpdl_ptr == specpdl + specpdl_size) | |
3042 | grow_specpdl (); | |
3043 | specpdl_ptr->func = function; | |
3044 | specpdl_ptr->symbol = Qnil; | |
3045 | specpdl_ptr->old_value = arg; | |
3046 | specpdl_ptr++; | |
3047 | } | |
3048 | ||
3049 | Lisp_Object | |
3050 | unbind_to (count, value) | |
3051 | int count; | |
3052 | Lisp_Object value; | |
3053 | { | |
265a9e55 | 3054 | int quitf = !NILP (Vquit_flag); |
db9f0278 JB |
3055 | struct gcpro gcpro1; |
3056 | ||
3057 | GCPRO1 (value); | |
db9f0278 JB |
3058 | Vquit_flag = Qnil; |
3059 | ||
3060 | while (specpdl_ptr != specpdl + count) | |
3061 | { | |
3062 | --specpdl_ptr; | |
eb700b82 | 3063 | |
db9f0278 JB |
3064 | if (specpdl_ptr->func != 0) |
3065 | (*specpdl_ptr->func) (specpdl_ptr->old_value); | |
3066 | /* Note that a "binding" of nil is really an unwind protect, | |
719177b3 | 3067 | so in that case the "old value" is a list of forms to evaluate. */ |
265a9e55 | 3068 | else if (NILP (specpdl_ptr->symbol)) |
db9f0278 | 3069 | Fprogn (specpdl_ptr->old_value); |
0967b4b0 GM |
3070 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3071 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3072 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3073 | bound a variable that had a buffer-local or frame-local |
3074 | binding. WHERE nil means that the variable had the default | |
0967b4b0 GM |
3075 | value when it was bound. CURRENT-BUFFER is the buffer that |
3076 | was current when the variable was bound. */ | |
719177b3 RS |
3077 | else if (CONSP (specpdl_ptr->symbol)) |
3078 | { | |
eb700b82 | 3079 | Lisp_Object symbol, where; |
719177b3 RS |
3080 | |
3081 | symbol = XCAR (specpdl_ptr->symbol); | |
0967b4b0 | 3082 | where = XCAR (XCDR (specpdl_ptr->symbol)); |
719177b3 | 3083 | |
eb700b82 | 3084 | if (NILP (where)) |
719177b3 | 3085 | Fset_default (symbol, specpdl_ptr->old_value); |
eb700b82 GM |
3086 | else if (BUFFERP (where)) |
3087 | set_internal (symbol, specpdl_ptr->old_value, XBUFFER (where), 1); | |
3088 | else | |
3089 | set_internal (symbol, specpdl_ptr->old_value, NULL, 1); | |
719177b3 | 3090 | } |
db9f0278 | 3091 | else |
9ab90667 GM |
3092 | { |
3093 | /* If variable has a trivial value (no forwarding), we can | |
3094 | just set it. No need to check for constant symbols here, | |
3095 | since that was already done by specbind. */ | |
19cebf5a GM |
3096 | if (!MISCP (SYMBOL_VALUE (specpdl_ptr->symbol))) |
3097 | SET_SYMBOL_VALUE (specpdl_ptr->symbol, specpdl_ptr->old_value); | |
9ab90667 GM |
3098 | else |
3099 | set_internal (specpdl_ptr->symbol, specpdl_ptr->old_value, 0, 1); | |
3100 | } | |
db9f0278 | 3101 | } |
9ab90667 GM |
3102 | |
3103 | if (NILP (Vquit_flag) && quitf) | |
3104 | Vquit_flag = Qt; | |
db9f0278 JB |
3105 | |
3106 | UNGCPRO; | |
db9f0278 JB |
3107 | return value; |
3108 | } | |
3109 | \f | |
db9f0278 | 3110 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3111 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3112 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
3113 | (level, flag) | |
db9f0278 JB |
3114 | Lisp_Object level, flag; |
3115 | { | |
3116 | register struct backtrace *backlist = backtrace_list; | |
3117 | register int i; | |
3118 | ||
b7826503 | 3119 | CHECK_NUMBER (level); |
db9f0278 JB |
3120 | |
3121 | for (i = 0; backlist && i < XINT (level); i++) | |
3122 | { | |
3123 | backlist = backlist->next; | |
3124 | } | |
3125 | ||
3126 | if (backlist) | |
265a9e55 | 3127 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3128 | |
3129 | return flag; | |
3130 | } | |
3131 | ||
3132 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3133 | doc: /* Print a trace of Lisp function calls currently active. |
3134 | Output stream used is value of `standard-output'. */) | |
3135 | () | |
db9f0278 JB |
3136 | { |
3137 | register struct backtrace *backlist = backtrace_list; | |
3138 | register int i; | |
3139 | Lisp_Object tail; | |
3140 | Lisp_Object tem; | |
3141 | extern Lisp_Object Vprint_level; | |
3142 | struct gcpro gcpro1; | |
3143 | ||
a631e24c | 3144 | XSETFASTINT (Vprint_level, 3); |
db9f0278 JB |
3145 | |
3146 | tail = Qnil; | |
3147 | GCPRO1 (tail); | |
3148 | ||
3149 | while (backlist) | |
3150 | { | |
3151 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
3152 | if (backlist->nargs == UNEVALLED) | |
3153 | { | |
3154 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3155 | write_string ("\n", -1); |
db9f0278 JB |
3156 | } |
3157 | else | |
3158 | { | |
3159 | tem = *backlist->function; | |
3160 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
3161 | write_string ("(", -1); | |
3162 | if (backlist->nargs == MANY) | |
3163 | { | |
3164 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 3165 | !NILP (tail); |
db9f0278 JB |
3166 | tail = Fcdr (tail), i++) |
3167 | { | |
3168 | if (i) write_string (" ", -1); | |
3169 | Fprin1 (Fcar (tail), Qnil); | |
3170 | } | |
3171 | } | |
3172 | else | |
3173 | { | |
3174 | for (i = 0; i < backlist->nargs; i++) | |
3175 | { | |
3176 | if (i) write_string (" ", -1); | |
3177 | Fprin1 (backlist->args[i], Qnil); | |
3178 | } | |
3179 | } | |
b6703b02 | 3180 | write_string (")\n", -1); |
db9f0278 | 3181 | } |
db9f0278 JB |
3182 | backlist = backlist->next; |
3183 | } | |
3184 | ||
3185 | Vprint_level = Qnil; | |
3186 | UNGCPRO; | |
3187 | return Qnil; | |
3188 | } | |
3189 | ||
17401c97 | 3190 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3191 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3192 | If that frame has not evaluated the arguments yet (or is a special form), | |
3193 | the value is (nil FUNCTION ARG-FORMS...). | |
3194 | If that frame has evaluated its arguments and called its function already, | |
3195 | the value is (t FUNCTION ARG-VALUES...). | |
3196 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3197 | FUNCTION is whatever was supplied as car of evaluated list, | |
3198 | or a lambda expression for macro calls. | |
3199 | If NFRAMES is more than the number of frames, the value is nil. */) | |
3200 | (nframes) | |
db9f0278 JB |
3201 | Lisp_Object nframes; |
3202 | { | |
3203 | register struct backtrace *backlist = backtrace_list; | |
3204 | register int i; | |
3205 | Lisp_Object tem; | |
3206 | ||
b7826503 | 3207 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3208 | |
3209 | /* Find the frame requested. */ | |
b6703b02 | 3210 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3211 | backlist = backlist->next; |
3212 | ||
3213 | if (!backlist) | |
3214 | return Qnil; | |
3215 | if (backlist->nargs == UNEVALLED) | |
3216 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
3217 | else | |
3218 | { | |
3219 | if (backlist->nargs == MANY) | |
3220 | tem = *backlist->args; | |
3221 | else | |
3222 | tem = Flist (backlist->nargs, backlist->args); | |
3223 | ||
3224 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3225 | } | |
3226 | } | |
a2ff3819 | 3227 | |
db9f0278 | 3228 | \f |
dfcf069d | 3229 | void |
db9f0278 JB |
3230 | syms_of_eval () |
3231 | { | |
3232 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
9dbc9081 PJ |
3233 | doc: /* *Limit on number of Lisp variable bindings & unwind-protects. |
3234 | If Lisp code tries to make more than this many at once, | |
3235 | an error is signaled. */); | |
db9f0278 JB |
3236 | |
3237 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
9dbc9081 PJ |
3238 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
3239 | This limit is to catch infinite recursions for you before they cause | |
3240 | actual stack overflow in C, which would be fatal for Emacs. | |
3241 | You can safely make it considerably larger than its default value, | |
3242 | if that proves inconveniently small. */); | |
db9f0278 JB |
3243 | |
3244 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
9dbc9081 PJ |
3245 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
3246 | Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'. */); | |
db9f0278 JB |
3247 | Vquit_flag = Qnil; |
3248 | ||
3249 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
9dbc9081 PJ |
3250 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3251 | Note that `quit-flag' will still be set by typing C-g, | |
3252 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3253 | To prevent this happening, set `quit-flag' to nil | |
3254 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3255 | Vinhibit_quit = Qnil; |
3256 | ||
ad236261 JB |
3257 | Qinhibit_quit = intern ("inhibit-quit"); |
3258 | staticpro (&Qinhibit_quit); | |
3259 | ||
db9f0278 JB |
3260 | Qautoload = intern ("autoload"); |
3261 | staticpro (&Qautoload); | |
3262 | ||
3263 | Qdebug_on_error = intern ("debug-on-error"); | |
3264 | staticpro (&Qdebug_on_error); | |
3265 | ||
3266 | Qmacro = intern ("macro"); | |
3267 | staticpro (&Qmacro); | |
3268 | ||
3269 | /* Note that the process handling also uses Qexit, but we don't want | |
3270 | to staticpro it twice, so we just do it here. */ | |
3271 | Qexit = intern ("exit"); | |
3272 | staticpro (&Qexit); | |
3273 | ||
3274 | Qinteractive = intern ("interactive"); | |
3275 | staticpro (&Qinteractive); | |
3276 | ||
3277 | Qcommandp = intern ("commandp"); | |
3278 | staticpro (&Qcommandp); | |
3279 | ||
3280 | Qdefun = intern ("defun"); | |
3281 | staticpro (&Qdefun); | |
3282 | ||
3283 | Qand_rest = intern ("&rest"); | |
3284 | staticpro (&Qand_rest); | |
3285 | ||
3286 | Qand_optional = intern ("&optional"); | |
3287 | staticpro (&Qand_optional); | |
3288 | ||
128c0f66 | 3289 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
704788b3 RS |
3290 | doc: /* *Non-nil means errors display a backtrace buffer. |
3291 | More precisely, this happens for any error that is handled | |
3292 | by the editor command loop. | |
9dbc9081 PJ |
3293 | If the value is a list, an error only means to display a backtrace |
3294 | if one of its condition symbols appears in the list. */); | |
128c0f66 | 3295 | Vstack_trace_on_error = Qnil; |
db9f0278 | 3296 | |
128c0f66 | 3297 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
9dbc9081 PJ |
3298 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3299 | Does not apply to errors handled by `condition-case' or those | |
3300 | matched by `debug-ignored-errors'. | |
3301 | If the value is a list, an error only means to enter the debugger | |
3302 | if one of its condition symbols appears in the list. | |
3303 | When you evaluate an expression interactively, this variable | |
3304 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
3305 | See also variable `debug-on-quit'. */); | |
128c0f66 | 3306 | Vdebug_on_error = Qnil; |
db9f0278 | 3307 | |
fc950e09 | 3308 | DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors, |
9dbc9081 PJ |
3309 | doc: /* *List of errors for which the debugger should not be called. |
3310 | Each element may be a condition-name or a regexp that matches error messages. | |
3311 | If any element applies to a given error, that error skips the debugger | |
3312 | and just returns to top level. | |
3313 | This overrides the variable `debug-on-error'. | |
3314 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3315 | Vdebug_ignored_errors = Qnil; |
3316 | ||
db9f0278 | 3317 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, |
9dbc9081 PJ |
3318 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3319 | Does not apply if quit is handled by a `condition-case'. | |
3320 | When you evaluate an expression interactively, this variable | |
3321 | is temporarily non-nil if `eval-expression-debug-on-quit' is non-nil. */); | |
db9f0278 JB |
3322 | debug_on_quit = 0; |
3323 | ||
3324 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
9dbc9081 | 3325 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3326 | |
556d7314 | 3327 | DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue, |
9dbc9081 PJ |
3328 | doc: /* Non-nil means debugger may continue execution. |
3329 | This is nil when the debugger is called under circumstances where it | |
3330 | might not be safe to continue. */); | |
dac204bc | 3331 | debugger_may_continue = 1; |
556d7314 | 3332 | |
db9f0278 | 3333 | DEFVAR_LISP ("debugger", &Vdebugger, |
9dbc9081 PJ |
3334 | doc: /* Function to call to invoke debugger. |
3335 | If due to frame exit, args are `exit' and the value being returned; | |
3336 | this function's value will be returned instead of that. | |
3337 | If due to error, args are `error' and a list of the args to `signal'. | |
3338 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3339 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3340 | Vdebugger = Qnil; |
3341 | ||
61ede770 | 3342 | DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function, |
9dbc9081 PJ |
3343 | doc: /* If non-nil, this is a function for `signal' to call. |
3344 | It receives the same arguments that `signal' was given. | |
3345 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3346 | Vsignal_hook_function = Qnil; |
3347 | ||
db9f0278 JB |
3348 | Qmocklisp_arguments = intern ("mocklisp-arguments"); |
3349 | staticpro (&Qmocklisp_arguments); | |
3350 | DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments, | |
9dbc9081 | 3351 | doc: /* While in a mocklisp function, the list of its unevaluated args. */); |
db9f0278 JB |
3352 | Vmocklisp_arguments = Qt; |
3353 | ||
57a6e758 | 3354 | DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal, |
9dbc9081 PJ |
3355 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3356 | Note that `debug-on-error', `debug-on-quit' and friends | |
3357 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3358 | Vdebug_on_signal = Qnil; |
61ede770 | 3359 | |
6e6e9f08 RS |
3360 | Vrun_hooks = intern ("run-hooks"); |
3361 | staticpro (&Vrun_hooks); | |
db9f0278 JB |
3362 | |
3363 | staticpro (&Vautoload_queue); | |
3364 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3365 | staticpro (&Vsignaling_function); |
3366 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3367 | |
3368 | defsubr (&Sor); | |
3369 | defsubr (&Sand); | |
3370 | defsubr (&Sif); | |
3371 | defsubr (&Scond); | |
3372 | defsubr (&Sprogn); | |
3373 | defsubr (&Sprog1); | |
3374 | defsubr (&Sprog2); | |
3375 | defsubr (&Ssetq); | |
3376 | defsubr (&Squote); | |
3377 | defsubr (&Sfunction); | |
3378 | defsubr (&Sdefun); | |
3379 | defsubr (&Sdefmacro); | |
3380 | defsubr (&Sdefvar); | |
19cebf5a | 3381 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3382 | defsubr (&Sdefconst); |
3383 | defsubr (&Suser_variable_p); | |
3384 | defsubr (&Slet); | |
3385 | defsubr (&SletX); | |
3386 | defsubr (&Swhile); | |
3387 | defsubr (&Smacroexpand); | |
3388 | defsubr (&Scatch); | |
3389 | defsubr (&Sthrow); | |
3390 | defsubr (&Sunwind_protect); | |
3391 | defsubr (&Scondition_case); | |
3392 | defsubr (&Ssignal); | |
3393 | defsubr (&Sinteractive_p); | |
3394 | defsubr (&Scommandp); | |
3395 | defsubr (&Sautoload); | |
3396 | defsubr (&Seval); | |
3397 | defsubr (&Sapply); | |
3398 | defsubr (&Sfuncall); | |
ff936e53 SM |
3399 | defsubr (&Srun_hooks); |
3400 | defsubr (&Srun_hook_with_args); | |
3401 | defsubr (&Srun_hook_with_args_until_success); | |
3402 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 3403 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3404 | defsubr (&Sbacktrace_debug); |
3405 | defsubr (&Sbacktrace); | |
3406 | defsubr (&Sbacktrace_frame); | |
3407 | } |