Commit | Line | Data |
---|---|---|
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 Qand_rest, Qand_optional; |
93 | Lisp_Object Qdebug_on_error; | |
94 | ||
6e6e9f08 RS |
95 | /* This holds either the symbol `run-hooks' or nil. |
96 | It is nil at an early stage of startup, and when Emacs | |
97 | is shutting down. */ | |
4c576a83 | 98 | |
db9f0278 JB |
99 | Lisp_Object Vrun_hooks; |
100 | ||
101 | /* Non-nil means record all fset's and provide's, to be undone | |
102 | if the file being autoloaded is not fully loaded. | |
103 | They are recorded by being consed onto the front of Vautoload_queue: | |
104 | (FUN . ODEF) for a defun, (OFEATURES . nil) for a provide. */ | |
105 | ||
106 | Lisp_Object Vautoload_queue; | |
107 | ||
108 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 109 | |
db9f0278 JB |
110 | int specpdl_size; |
111 | ||
112 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 113 | |
db9f0278 JB |
114 | struct specbinding *specpdl; |
115 | ||
116 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 117 | |
db9f0278 JB |
118 | struct specbinding *specpdl_ptr; |
119 | ||
120 | /* Maximum size allowed for specpdl allocation */ | |
4c576a83 | 121 | |
2901f1d1 | 122 | EMACS_INT max_specpdl_size; |
db9f0278 JB |
123 | |
124 | /* Depth in Lisp evaluations and function calls. */ | |
4c576a83 | 125 | |
db9f0278 JB |
126 | int lisp_eval_depth; |
127 | ||
128 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
4c576a83 | 129 | |
2901f1d1 | 130 | EMACS_INT max_lisp_eval_depth; |
db9f0278 JB |
131 | |
132 | /* Nonzero means enter debugger before next function call */ | |
4c576a83 | 133 | |
db9f0278 JB |
134 | int debug_on_next_call; |
135 | ||
1b1acc13 | 136 | /* Non-zero means debugger may continue. This is zero when the |
556d7314 GM |
137 | debugger is called during redisplay, where it might not be safe to |
138 | continue the interrupted redisplay. */ | |
139 | ||
140 | int debugger_may_continue; | |
141 | ||
128c0f66 | 142 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 143 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 144 | |
128c0f66 | 145 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 146 | |
128c0f66 | 147 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 148 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 149 | |
128c0f66 | 150 | Lisp_Object Vdebug_on_error; |
db9f0278 | 151 | |
fc950e09 | 152 | /* List of conditions and regexps specifying error messages which |
1b1acc13 | 153 | do not enter the debugger even if Vdebug_on_error says they should. */ |
4c576a83 | 154 | |
fc950e09 KH |
155 | Lisp_Object Vdebug_ignored_errors; |
156 | ||
61ede770 | 157 | /* Non-nil means call the debugger even if the error will be handled. */ |
4c576a83 | 158 | |
57a6e758 | 159 | Lisp_Object Vdebug_on_signal; |
61ede770 RS |
160 | |
161 | /* Hook for edebug to use. */ | |
4c576a83 | 162 | |
61ede770 RS |
163 | Lisp_Object Vsignal_hook_function; |
164 | ||
db9f0278 | 165 | /* Nonzero means enter debugger if a quit signal |
128c0f66 | 166 | is handled by the command loop's error handler. */ |
4c576a83 | 167 | |
db9f0278 JB |
168 | int debug_on_quit; |
169 | ||
be857679 | 170 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 171 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 172 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
173 | know that the debugger itself has an error, and we should just |
174 | signal the error instead of entering an infinite loop of debugger | |
175 | invocations. */ | |
4c576a83 | 176 | |
82da7701 | 177 | int when_entered_debugger; |
db9f0278 JB |
178 | |
179 | Lisp_Object Vdebugger; | |
180 | ||
a2ff3819 GM |
181 | /* The function from which the last `signal' was called. Set in |
182 | Fsignal. */ | |
183 | ||
184 | Lisp_Object Vsignaling_function; | |
185 | ||
4c576a83 GM |
186 | /* Set to non-zero while processing X events. Checked in Feval to |
187 | make sure the Lisp interpreter isn't called from a signal handler, | |
188 | which is unsafe because the interpreter isn't reentrant. */ | |
189 | ||
190 | int handling_signal; | |
191 | ||
2901f1d1 | 192 | static Lisp_Object funcall_lambda P_ ((Lisp_Object, int, Lisp_Object*)); |
db9f0278 | 193 | |
dfcf069d | 194 | void |
db9f0278 JB |
195 | init_eval_once () |
196 | { | |
197 | specpdl_size = 50; | |
716acfce | 198 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 199 | specpdl_ptr = specpdl; |
db9f0278 | 200 | max_specpdl_size = 600; |
969f5145 | 201 | max_lisp_eval_depth = 300; |
34d470ba RS |
202 | |
203 | Vrun_hooks = Qnil; | |
db9f0278 JB |
204 | } |
205 | ||
dfcf069d | 206 | void |
db9f0278 JB |
207 | init_eval () |
208 | { | |
209 | specpdl_ptr = specpdl; | |
210 | catchlist = 0; | |
211 | handlerlist = 0; | |
212 | backtrace_list = 0; | |
213 | Vquit_flag = Qnil; | |
214 | debug_on_next_call = 0; | |
215 | lisp_eval_depth = 0; | |
87e21fbd | 216 | #ifdef DEBUG_GCPRO |
15934ffa | 217 | gcpro_level = 0; |
87e21fbd | 218 | #endif |
be857679 | 219 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 220 | when_entered_debugger = -1; |
db9f0278 JB |
221 | } |
222 | ||
223 | Lisp_Object | |
224 | call_debugger (arg) | |
225 | Lisp_Object arg; | |
226 | { | |
3648c842 | 227 | int debug_while_redisplaying; |
556d7314 | 228 | int count = specpdl_ptr - specpdl; |
3648c842 GM |
229 | Lisp_Object val; |
230 | ||
db9f0278 JB |
231 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) |
232 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
3648c842 | 233 | |
db9f0278 JB |
234 | if (specpdl_size + 40 > max_specpdl_size) |
235 | max_specpdl_size = specpdl_size + 40; | |
3648c842 | 236 | |
237c23b0 | 237 | #ifdef HAVE_X_WINDOWS |
df6c90d8 GM |
238 | if (display_hourglass_p) |
239 | cancel_hourglass (); | |
237c23b0 GM |
240 | #endif |
241 | ||
db9f0278 | 242 | debug_on_next_call = 0; |
be857679 | 243 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
244 | |
245 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
246 | displayed if the debugger is invoked during redisplay. */ | |
247 | debug_while_redisplaying = redisplaying_p; | |
248 | redisplaying_p = 0; | |
556d7314 GM |
249 | specbind (intern ("debugger-may-continue"), |
250 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 251 | specbind (Qinhibit_redisplay, Qnil); |
9db6f6b4 GM |
252 | |
253 | #if 0 /* Binding this prevents execution of Lisp code during | |
254 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 255 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 256 | #endif |
3648c842 GM |
257 | |
258 | val = apply1 (Vdebugger, arg); | |
259 | ||
260 | /* Interrupting redisplay and resuming it later is not safe under | |
261 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 262 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
263 | if (debug_while_redisplaying) |
264 | Ftop_level (); | |
265 | ||
556d7314 | 266 | return unbind_to (count, val); |
db9f0278 JB |
267 | } |
268 | ||
dfcf069d | 269 | void |
db9f0278 JB |
270 | do_debug_on_call (code) |
271 | Lisp_Object code; | |
272 | { | |
273 | debug_on_next_call = 0; | |
274 | backtrace_list->debug_on_exit = 1; | |
275 | call_debugger (Fcons (code, Qnil)); | |
276 | } | |
277 | \f | |
278 | /* NOTE!!! Every function that can call EVAL must protect its args | |
279 | and temporaries from garbage collection while it needs them. | |
280 | The definition of `For' shows what you have to do. */ | |
281 | ||
282 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
283 | doc: /* Eval args until one of them yields non-nil, then return that value. |
284 | The remaining args are not evalled at all. | |
285 | If all args return nil, return nil. | |
7a25dc6d | 286 | usage: (or CONDITIONS ...) */) |
9dbc9081 | 287 | (args) |
db9f0278 JB |
288 | Lisp_Object args; |
289 | { | |
290 | register Lisp_Object val; | |
291 | Lisp_Object args_left; | |
292 | struct gcpro gcpro1; | |
293 | ||
265a9e55 | 294 | if (NILP(args)) |
db9f0278 JB |
295 | return Qnil; |
296 | ||
297 | args_left = args; | |
298 | GCPRO1 (args_left); | |
299 | ||
300 | do | |
301 | { | |
302 | val = Feval (Fcar (args_left)); | |
265a9e55 | 303 | if (!NILP (val)) |
db9f0278 JB |
304 | break; |
305 | args_left = Fcdr (args_left); | |
306 | } | |
265a9e55 | 307 | while (!NILP(args_left)); |
db9f0278 JB |
308 | |
309 | UNGCPRO; | |
310 | return val; | |
311 | } | |
312 | ||
313 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 314 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
315 | The remaining args are not evalled at all. |
316 | If no arg yields nil, return the last arg's value. | |
7a25dc6d | 317 | usage: (and CONDITIONS ...) */) |
9dbc9081 | 318 | (args) |
db9f0278 JB |
319 | Lisp_Object args; |
320 | { | |
321 | register Lisp_Object val; | |
322 | Lisp_Object args_left; | |
323 | struct gcpro gcpro1; | |
324 | ||
265a9e55 | 325 | if (NILP(args)) |
db9f0278 JB |
326 | return Qt; |
327 | ||
328 | args_left = args; | |
329 | GCPRO1 (args_left); | |
330 | ||
331 | do | |
332 | { | |
333 | val = Feval (Fcar (args_left)); | |
265a9e55 | 334 | if (NILP (val)) |
db9f0278 JB |
335 | break; |
336 | args_left = Fcdr (args_left); | |
337 | } | |
265a9e55 | 338 | while (!NILP(args_left)); |
db9f0278 JB |
339 | |
340 | UNGCPRO; | |
341 | return val; | |
342 | } | |
343 | ||
344 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 345 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
346 | Returns the value of THEN or the value of the last of the ELSE's. |
347 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
348 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 349 | usage: (if COND THEN ELSE...) */) |
9dbc9081 | 350 | (args) |
db9f0278 JB |
351 | Lisp_Object args; |
352 | { | |
353 | register Lisp_Object cond; | |
354 | struct gcpro gcpro1; | |
355 | ||
356 | GCPRO1 (args); | |
357 | cond = Feval (Fcar (args)); | |
358 | UNGCPRO; | |
359 | ||
265a9e55 | 360 | if (!NILP (cond)) |
db9f0278 JB |
361 | return Feval (Fcar (Fcdr (args))); |
362 | return Fprogn (Fcdr (Fcdr (args))); | |
363 | } | |
364 | ||
365 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
366 | doc: /* Try each clause until one succeeds. |
367 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
368 | and, if the value is non-nil, this clause succeeds: | |
369 | then the expressions in BODY are evaluated and the last one's | |
370 | value is the value of the cond-form. | |
371 | If no clause succeeds, cond returns nil. | |
372 | If a clause has one element, as in (CONDITION), | |
373 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 374 | usage: (cond CLAUSES...) */) |
9dbc9081 | 375 | (args) |
db9f0278 JB |
376 | Lisp_Object args; |
377 | { | |
378 | register Lisp_Object clause, val; | |
379 | struct gcpro gcpro1; | |
380 | ||
381 | val = Qnil; | |
382 | GCPRO1 (args); | |
265a9e55 | 383 | while (!NILP (args)) |
db9f0278 JB |
384 | { |
385 | clause = Fcar (args); | |
386 | val = Feval (Fcar (clause)); | |
265a9e55 | 387 | if (!NILP (val)) |
db9f0278 | 388 | { |
03699b14 KR |
389 | if (!EQ (XCDR (clause), Qnil)) |
390 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
391 | break; |
392 | } | |
03699b14 | 393 | args = XCDR (args); |
db9f0278 JB |
394 | } |
395 | UNGCPRO; | |
396 | ||
397 | return val; | |
398 | } | |
399 | ||
400 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
9dbc9081 | 401 | doc: /* Eval BODY forms sequentially and return value of last one. |
7a25dc6d | 402 | usage: (progn BODY ...) */) |
9dbc9081 | 403 | (args) |
db9f0278 JB |
404 | Lisp_Object args; |
405 | { | |
2b9bde76 | 406 | register Lisp_Object val; |
db9f0278 JB |
407 | Lisp_Object args_left; |
408 | struct gcpro gcpro1; | |
409 | ||
265a9e55 | 410 | if (NILP(args)) |
db9f0278 JB |
411 | return Qnil; |
412 | ||
413 | args_left = args; | |
414 | GCPRO1 (args_left); | |
415 | ||
416 | do | |
417 | { | |
418 | val = Feval (Fcar (args_left)); | |
419 | args_left = Fcdr (args_left); | |
420 | } | |
265a9e55 | 421 | while (!NILP(args_left)); |
db9f0278 JB |
422 | |
423 | UNGCPRO; | |
424 | return val; | |
425 | } | |
426 | ||
427 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
428 | doc: /* Eval FIRST and BODY sequentially; value from FIRST. |
429 | The value of FIRST is saved during the evaluation of the remaining args, | |
430 | whose values are discarded. | |
7a25dc6d | 431 | usage: (prog1 FIRST BODY...) */) |
9dbc9081 | 432 | (args) |
db9f0278 JB |
433 | Lisp_Object args; |
434 | { | |
435 | Lisp_Object val; | |
436 | register Lisp_Object args_left; | |
437 | struct gcpro gcpro1, gcpro2; | |
438 | register int argnum = 0; | |
439 | ||
265a9e55 | 440 | if (NILP(args)) |
db9f0278 JB |
441 | return Qnil; |
442 | ||
443 | args_left = args; | |
444 | val = Qnil; | |
445 | GCPRO2 (args, val); | |
446 | ||
447 | do | |
448 | { | |
449 | if (!(argnum++)) | |
450 | val = Feval (Fcar (args_left)); | |
451 | else | |
452 | Feval (Fcar (args_left)); | |
453 | args_left = Fcdr (args_left); | |
454 | } | |
265a9e55 | 455 | while (!NILP(args_left)); |
db9f0278 JB |
456 | |
457 | UNGCPRO; | |
458 | return val; | |
459 | } | |
460 | ||
461 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
462 | doc: /* Eval X, Y and BODY sequentially; value from Y. |
463 | The value of Y is saved during the evaluation of the remaining args, | |
464 | whose values are discarded. | |
7a25dc6d | 465 | usage: (prog2 X Y BODY...) */) |
9dbc9081 | 466 | (args) |
db9f0278 JB |
467 | Lisp_Object args; |
468 | { | |
469 | Lisp_Object val; | |
470 | register Lisp_Object args_left; | |
471 | struct gcpro gcpro1, gcpro2; | |
472 | register int argnum = -1; | |
473 | ||
474 | val = Qnil; | |
475 | ||
87d238ba | 476 | if (NILP (args)) |
db9f0278 JB |
477 | return Qnil; |
478 | ||
479 | args_left = args; | |
480 | val = Qnil; | |
481 | GCPRO2 (args, val); | |
482 | ||
483 | do | |
484 | { | |
485 | if (!(argnum++)) | |
486 | val = Feval (Fcar (args_left)); | |
487 | else | |
488 | Feval (Fcar (args_left)); | |
489 | args_left = Fcdr (args_left); | |
490 | } | |
87d238ba | 491 | while (!NILP (args_left)); |
db9f0278 JB |
492 | |
493 | UNGCPRO; | |
494 | return val; | |
495 | } | |
496 | ||
497 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
498 | doc: /* Set each SYM to the value of its VAL. |
499 | The symbols SYM are variables; they are literal (not evaluated). | |
500 | The values VAL are expressions; they are evaluated. | |
501 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
502 | The second VAL is not computed until after the first SYM is set, and so on; | |
503 | each VAL can use the new value of variables set earlier in the `setq'. | |
504 | The return value of the `setq' form is the value of the last VAL. | |
505 | usage: (setq SYM VAL SYM VAL ...) */) | |
506 | (args) | |
db9f0278 JB |
507 | Lisp_Object args; |
508 | { | |
509 | register Lisp_Object args_left; | |
510 | register Lisp_Object val, sym; | |
511 | struct gcpro gcpro1; | |
512 | ||
265a9e55 | 513 | if (NILP(args)) |
db9f0278 JB |
514 | return Qnil; |
515 | ||
516 | args_left = args; | |
517 | GCPRO1 (args); | |
518 | ||
519 | do | |
520 | { | |
521 | val = Feval (Fcar (Fcdr (args_left))); | |
522 | sym = Fcar (args_left); | |
523 | Fset (sym, val); | |
524 | args_left = Fcdr (Fcdr (args_left)); | |
525 | } | |
265a9e55 | 526 | while (!NILP(args_left)); |
db9f0278 JB |
527 | |
528 | UNGCPRO; | |
529 | return val; | |
530 | } | |
531 | ||
532 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
533 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
534 | usage: (quote ARG) */) | |
535 | (args) | |
db9f0278 JB |
536 | Lisp_Object args; |
537 | { | |
538 | return Fcar (args); | |
539 | } | |
540 | ||
541 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
542 | doc: /* Like `quote', but preferred for objects which are functions. |
543 | In byte compilation, `function' causes its argument to be compiled. | |
544 | `quote' cannot do that. | |
545 | usage: (function ARG) */) | |
546 | (args) | |
db9f0278 JB |
547 | Lisp_Object args; |
548 | { | |
549 | return Fcar (args); | |
550 | } | |
551 | ||
e0f331ab | 552 | |
db9f0278 | 553 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
9dbc9081 PJ |
554 | doc: /* Return t if function in which this appears was called interactively. |
555 | This means that the function was called with call-interactively (which | |
556 | includes being called as the binding of a key) | |
557 | and input is currently coming from the keyboard (not in keyboard macro). */) | |
558 | () | |
db9f0278 | 559 | { |
e0f331ab GM |
560 | return interactive_p (1) ? Qt : Qnil; |
561 | } | |
562 | ||
563 | ||
564 | /* Return 1 if function in which this appears was called | |
565 | interactively. This means that the function was called with | |
566 | call-interactively (which includes being called as the binding of | |
567 | a key) and input is currently coming from the keyboard (not in | |
568 | keyboard macro). | |
569 | ||
570 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
571 | called is a built-in. */ | |
572 | ||
573 | int | |
574 | interactive_p (exclude_subrs_p) | |
575 | int exclude_subrs_p; | |
576 | { | |
577 | struct backtrace *btp; | |
578 | Lisp_Object fun; | |
db9f0278 JB |
579 | |
580 | if (!INTERACTIVE) | |
e0f331ab | 581 | return 0; |
db9f0278 | 582 | |
db9f0278 | 583 | btp = backtrace_list; |
daa37602 JB |
584 | |
585 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 586 | the top for Finteractive_p. If so, skip it. */ |
daa37602 | 587 | fun = Findirect_function (*btp->function); |
0598f773 | 588 | if (SUBRP (fun) && XSUBR (fun) == &Sinteractive_p) |
db9f0278 | 589 | btp = btp->next; |
daa37602 JB |
590 | |
591 | /* If we're running an Emacs 18-style byte-compiled function, there | |
592 | may be a frame for Fbytecode. Now, given the strictest | |
593 | definition, this function isn't really being called | |
594 | interactively, but because that's the way Emacs 18 always builds | |
595 | byte-compiled functions, we'll accept it for now. */ | |
596 | if (EQ (*btp->function, Qbytecode)) | |
597 | btp = btp->next; | |
598 | ||
599 | /* If this isn't a byte-compiled function, then we may now be | |
600 | looking at several frames for special forms. Skip past them. */ | |
601 | while (btp && | |
602 | btp->nargs == UNEVALLED) | |
a6e3fa71 JB |
603 | btp = btp->next; |
604 | ||
daa37602 JB |
605 | /* btp now points at the frame of the innermost function that isn't |
606 | a special form, ignoring frames for Finteractive_p and/or | |
607 | Fbytecode at the top. If this frame is for a built-in function | |
608 | (such as load or eval-region) return nil. */ | |
ffd56f97 | 609 | fun = Findirect_function (*btp->function); |
e0f331ab GM |
610 | if (exclude_subrs_p && SUBRP (fun)) |
611 | return 0; | |
612 | ||
db9f0278 JB |
613 | /* btp points to the frame of a Lisp function that called interactive-p. |
614 | Return t if that function was called interactively. */ | |
615 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
616 | return 1; |
617 | return 0; | |
db9f0278 JB |
618 | } |
619 | ||
e0f331ab | 620 | |
db9f0278 | 621 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
622 | doc: /* Define NAME as a function. |
623 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
624 | See also the function `interactive'. | |
7a25dc6d | 625 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
9dbc9081 | 626 | (args) |
db9f0278 JB |
627 | Lisp_Object args; |
628 | { | |
629 | register Lisp_Object fn_name; | |
630 | register Lisp_Object defn; | |
631 | ||
632 | fn_name = Fcar (args); | |
633 | defn = Fcons (Qlambda, Fcdr (args)); | |
265a9e55 | 634 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
635 | defn = Fpurecopy (defn); |
636 | Ffset (fn_name, defn); | |
2a49b6e5 | 637 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
638 | return fn_name; |
639 | } | |
640 | ||
641 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
642 | doc: /* Define NAME as a macro. |
643 | The definition is (macro lambda ARGLIST [DOCSTRING] BODY...). | |
644 | When the macro is called, as in (NAME ARGS...), | |
645 | the function (lambda ARGLIST BODY...) is applied to | |
646 | the list ARGS... as it appears in the expression, | |
647 | and the result should be a form to be evaluated instead of the original. | |
7a25dc6d | 648 | usage: (defmacro NAME ARGLIST [DOCSTRING] BODY...) */) |
9dbc9081 | 649 | (args) |
db9f0278 JB |
650 | Lisp_Object args; |
651 | { | |
652 | register Lisp_Object fn_name; | |
653 | register Lisp_Object defn; | |
654 | ||
655 | fn_name = Fcar (args); | |
656 | defn = Fcons (Qmacro, Fcons (Qlambda, Fcdr (args))); | |
265a9e55 | 657 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
658 | defn = Fpurecopy (defn); |
659 | Ffset (fn_name, defn); | |
2a49b6e5 | 660 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
661 | return fn_name; |
662 | } | |
663 | ||
19cebf5a GM |
664 | |
665 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 2, 0, | |
9dbc9081 PJ |
666 | doc: /* Make SYMBOL a variable alias for symbol ALIASED. |
667 | Setting the value of SYMBOL will subsequently set the value of ALIASED, | |
668 | and getting the value of SYMBOL will return the value ALIASED has. | |
669 | ALIASED nil means remove the alias; SYMBOL is unbound after that. */) | |
670 | (symbol, aliased) | |
19cebf5a GM |
671 | Lisp_Object symbol, aliased; |
672 | { | |
673 | struct Lisp_Symbol *sym; | |
674 | ||
b7826503 PJ |
675 | CHECK_SYMBOL (symbol); |
676 | CHECK_SYMBOL (aliased); | |
19cebf5a GM |
677 | |
678 | if (SYMBOL_CONSTANT_P (symbol)) | |
679 | error ("Cannot make a constant an alias"); | |
680 | ||
681 | sym = XSYMBOL (symbol); | |
682 | sym->indirect_variable = 1; | |
683 | sym->value = aliased; | |
684 | sym->constant = SYMBOL_CONSTANT_P (aliased); | |
685 | LOADHIST_ATTACH (symbol); | |
686 | ||
687 | return aliased; | |
688 | } | |
689 | ||
690 | ||
db9f0278 | 691 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
9dbc9081 PJ |
692 | doc: /* Define SYMBOL as a variable. |
693 | You are not required to define a variable in order to use it, | |
694 | but the definition can supply documentation and an initial value | |
695 | in a way that tags can recognize. | |
696 | ||
697 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
698 | If SYMBOL is buffer-local, its default value is what is set; | |
699 | buffer-local values are not affected. | |
700 | INITVALUE and DOCSTRING are optional. | |
701 | If DOCSTRING starts with *, this variable is identified as a user option. | |
702 | This means that M-x set-variable recognizes it. | |
703 | See also `user-variable-p'. | |
704 | If INITVALUE is missing, SYMBOL's value is not set. | |
2df5238c | 705 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
9dbc9081 | 706 | (args) |
db9f0278 JB |
707 | Lisp_Object args; |
708 | { | |
a42ba017 | 709 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
710 | |
711 | sym = Fcar (args); | |
a42ba017 RS |
712 | tail = Fcdr (args); |
713 | if (!NILP (Fcdr (Fcdr (tail)))) | |
714 | error ("too many arguments"); | |
715 | ||
33568849 | 716 | tem = Fdefault_boundp (sym); |
a42ba017 | 717 | if (!NILP (tail)) |
db9f0278 | 718 | { |
265a9e55 | 719 | if (NILP (tem)) |
33568849 SM |
720 | Fset_default (sym, Feval (Fcar (tail))); |
721 | tail = Fcdr (tail); | |
722 | if (!NILP (Fcar (tail))) | |
723 | { | |
724 | tem = Fcar (tail); | |
725 | if (!NILP (Vpurify_flag)) | |
726 | tem = Fpurecopy (tem); | |
727 | Fput (sym, Qvariable_documentation, tem); | |
728 | } | |
729 | LOADHIST_ATTACH (sym); | |
db9f0278 | 730 | } |
33568849 SM |
731 | else |
732 | /* A (defvar <var>) should not take precedence in the load-history over | |
733 | an earlier (defvar <var> <val>), so only add to history if the default | |
734 | value is still unbound. */ | |
735 | if (NILP (tem)) | |
736 | LOADHIST_ATTACH (sym); | |
737 | ||
db9f0278 JB |
738 | return sym; |
739 | } | |
740 | ||
741 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
742 | doc: /* Define SYMBOL as a constant variable. |
743 | The intent is that neither programs nor users should ever change this value. | |
744 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
745 | If SYMBOL is buffer-local, its default value is what is set; | |
746 | buffer-local values are not affected. | |
747 | DOCSTRING is optional. | |
7a25dc6d | 748 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
9dbc9081 | 749 | (args) |
db9f0278 JB |
750 | Lisp_Object args; |
751 | { | |
752 | register Lisp_Object sym, tem; | |
753 | ||
754 | sym = Fcar (args); | |
a42ba017 RS |
755 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
756 | error ("too many arguments"); | |
757 | ||
1182a7cb DL |
758 | tem = Feval (Fcar (Fcdr (args))); |
759 | if (!NILP (Vpurify_flag)) | |
760 | tem = Fpurecopy (tem); | |
761 | Fset_default (sym, tem); | |
db9f0278 | 762 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 763 | if (!NILP (tem)) |
db9f0278 | 764 | { |
265a9e55 | 765 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
766 | tem = Fpurecopy (tem); |
767 | Fput (sym, Qvariable_documentation, tem); | |
768 | } | |
2a49b6e5 | 769 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
770 | return sym; |
771 | } | |
772 | ||
773 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, | |
9dbc9081 PJ |
774 | doc: /* Returns t if VARIABLE is intended to be set and modified by users. |
775 | \(The alternative is a variable used internally in a Lisp program.) | |
776 | Determined by whether the first character of the documentation | |
777 | for the variable is `*' or if the variable is customizable (has a non-nil | |
778 | value of any of `custom-type', `custom-loads' or `standard-value' | |
779 | on its property list). */) | |
780 | (variable) | |
db9f0278 JB |
781 | Lisp_Object variable; |
782 | { | |
783 | Lisp_Object documentation; | |
784 | ||
5e78e475 RS |
785 | if (!SYMBOLP (variable)) |
786 | return Qnil; | |
787 | ||
db9f0278 | 788 | documentation = Fget (variable, Qvariable_documentation); |
90165123 | 789 | if (INTEGERP (documentation) && XINT (documentation) < 0) |
db9f0278 | 790 | return Qt; |
65411977 RS |
791 | if (STRINGP (documentation) |
792 | && ((unsigned char) XSTRING (documentation)->data[0] == '*')) | |
793 | return Qt; | |
794 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ | |
795 | if (CONSP (documentation) | |
03699b14 KR |
796 | && STRINGP (XCAR (documentation)) |
797 | && INTEGERP (XCDR (documentation)) | |
798 | && XINT (XCDR (documentation)) < 0) | |
db9f0278 | 799 | return Qt; |
caff32a7 DL |
800 | /* Customizable? */ |
801 | if ((!NILP (Fget (variable, intern ("custom-type")))) | |
802 | || (!NILP (Fget (variable, intern ("custom-loads")))) | |
803 | || (!NILP (Fget (variable, intern ("standard-value"))))) | |
804 | return Qt; | |
db9f0278 JB |
805 | return Qnil; |
806 | } | |
807 | \f | |
808 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
809 | doc: /* Bind variables according to VARLIST then eval BODY. |
810 | The value of the last form in BODY is returned. | |
811 | Each element of VARLIST is a symbol (which is bound to nil) | |
812 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
813 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 814 | usage: (let* VARLIST BODY...) */) |
9dbc9081 | 815 | (args) |
db9f0278 JB |
816 | Lisp_Object args; |
817 | { | |
818 | Lisp_Object varlist, val, elt; | |
819 | int count = specpdl_ptr - specpdl; | |
820 | struct gcpro gcpro1, gcpro2, gcpro3; | |
821 | ||
822 | GCPRO3 (args, elt, varlist); | |
823 | ||
824 | varlist = Fcar (args); | |
265a9e55 | 825 | while (!NILP (varlist)) |
db9f0278 JB |
826 | { |
827 | QUIT; | |
828 | elt = Fcar (varlist); | |
90165123 | 829 | if (SYMBOLP (elt)) |
db9f0278 | 830 | specbind (elt, Qnil); |
08564963 JB |
831 | else if (! NILP (Fcdr (Fcdr (elt)))) |
832 | Fsignal (Qerror, | |
833 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
834 | elt)); | |
db9f0278 JB |
835 | else |
836 | { | |
837 | val = Feval (Fcar (Fcdr (elt))); | |
838 | specbind (Fcar (elt), val); | |
839 | } | |
840 | varlist = Fcdr (varlist); | |
841 | } | |
842 | UNGCPRO; | |
843 | val = Fprogn (Fcdr (args)); | |
844 | return unbind_to (count, val); | |
845 | } | |
846 | ||
847 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
848 | doc: /* Bind variables according to VARLIST then eval BODY. |
849 | The value of the last form in BODY is returned. | |
850 | Each element of VARLIST is a symbol (which is bound to nil) | |
851 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
852 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 853 | usage: (let VARLIST BODY...) */) |
9dbc9081 | 854 | (args) |
db9f0278 JB |
855 | Lisp_Object args; |
856 | { | |
857 | Lisp_Object *temps, tem; | |
858 | register Lisp_Object elt, varlist; | |
859 | int count = specpdl_ptr - specpdl; | |
860 | register int argnum; | |
861 | struct gcpro gcpro1, gcpro2; | |
862 | ||
863 | varlist = Fcar (args); | |
864 | ||
865 | /* Make space to hold the values to give the bound variables */ | |
866 | elt = Flength (varlist); | |
867 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
868 | ||
869 | /* Compute the values and store them in `temps' */ | |
870 | ||
871 | GCPRO2 (args, *temps); | |
872 | gcpro2.nvars = 0; | |
873 | ||
265a9e55 | 874 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
875 | { |
876 | QUIT; | |
877 | elt = Fcar (varlist); | |
90165123 | 878 | if (SYMBOLP (elt)) |
db9f0278 | 879 | temps [argnum++] = Qnil; |
08564963 JB |
880 | else if (! NILP (Fcdr (Fcdr (elt)))) |
881 | Fsignal (Qerror, | |
882 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
883 | elt)); | |
db9f0278 JB |
884 | else |
885 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
886 | gcpro2.nvars = argnum; | |
887 | } | |
888 | UNGCPRO; | |
889 | ||
890 | varlist = Fcar (args); | |
265a9e55 | 891 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
892 | { |
893 | elt = Fcar (varlist); | |
894 | tem = temps[argnum++]; | |
90165123 | 895 | if (SYMBOLP (elt)) |
db9f0278 JB |
896 | specbind (elt, tem); |
897 | else | |
898 | specbind (Fcar (elt), tem); | |
899 | } | |
900 | ||
901 | elt = Fprogn (Fcdr (args)); | |
902 | return unbind_to (count, elt); | |
903 | } | |
904 | ||
905 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
906 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
907 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
908 | until TEST returns nil. | |
7a25dc6d | 909 | usage: (while TEST BODY...) */) |
9dbc9081 | 910 | (args) |
db9f0278 JB |
911 | Lisp_Object args; |
912 | { | |
2b9bde76 | 913 | Lisp_Object test, body; |
db9f0278 JB |
914 | struct gcpro gcpro1, gcpro2; |
915 | ||
916 | GCPRO2 (test, body); | |
917 | ||
918 | test = Fcar (args); | |
919 | body = Fcdr (args); | |
2b9bde76 | 920 | while (!NILP (Feval (test))) |
db9f0278 JB |
921 | { |
922 | QUIT; | |
923 | Fprogn (body); | |
924 | } | |
925 | ||
926 | UNGCPRO; | |
927 | return Qnil; | |
928 | } | |
929 | ||
930 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
931 | doc: /* Return result of expanding macros at top level of FORM. |
932 | If FORM is not a macro call, it is returned unchanged. | |
933 | Otherwise, the macro is expanded and the expansion is considered | |
934 | in place of FORM. When a non-macro-call results, it is returned. | |
935 | ||
936 | The second optional arg ENVIRONMENT specifies an environment of macro | |
937 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
938 | (form, environment) | |
2e267a2e | 939 | Lisp_Object form; |
79e8bfbf | 940 | Lisp_Object environment; |
db9f0278 | 941 | { |
23d6b5a6 | 942 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
943 | register Lisp_Object expander, sym, def, tem; |
944 | ||
945 | while (1) | |
946 | { | |
947 | /* Come back here each time we expand a macro call, | |
948 | in case it expands into another macro call. */ | |
90165123 | 949 | if (!CONSP (form)) |
db9f0278 | 950 | break; |
23d6b5a6 | 951 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 952 | def = sym = XCAR (form); |
23d6b5a6 | 953 | tem = Qnil; |
db9f0278 JB |
954 | /* Trace symbols aliases to other symbols |
955 | until we get a symbol that is not an alias. */ | |
90165123 | 956 | while (SYMBOLP (def)) |
db9f0278 JB |
957 | { |
958 | QUIT; | |
23d6b5a6 | 959 | sym = def; |
79e8bfbf | 960 | tem = Fassq (sym, environment); |
265a9e55 | 961 | if (NILP (tem)) |
db9f0278 JB |
962 | { |
963 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
964 | if (!EQ (def, Qunbound)) |
965 | continue; | |
db9f0278 | 966 | } |
23d6b5a6 | 967 | break; |
db9f0278 | 968 | } |
79e8bfbf | 969 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 970 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 971 | if (NILP (tem)) |
db9f0278 | 972 | { |
79e8bfbf | 973 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 974 | Look at its function definition. */ |
90165123 | 975 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
976 | /* Not defined or definition not suitable */ |
977 | break; | |
03699b14 | 978 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
979 | { |
980 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 981 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 982 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
983 | /* Yes, load it and try again. */ |
984 | { | |
ca20916b RS |
985 | struct gcpro gcpro1; |
986 | GCPRO1 (form); | |
ee9ee63c | 987 | do_autoload (def, sym); |
ca20916b | 988 | UNGCPRO; |
ee9ee63c JB |
989 | continue; |
990 | } | |
991 | else | |
db9f0278 | 992 | break; |
db9f0278 | 993 | } |
03699b14 | 994 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 995 | break; |
03699b14 | 996 | else expander = XCDR (def); |
db9f0278 JB |
997 | } |
998 | else | |
999 | { | |
03699b14 | 1000 | expander = XCDR (tem); |
265a9e55 | 1001 | if (NILP (expander)) |
db9f0278 JB |
1002 | break; |
1003 | } | |
03699b14 | 1004 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1005 | } |
1006 | return form; | |
1007 | } | |
1008 | \f | |
1009 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1010 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1011 | TAG is evalled to get the tag to use; it must not be nil. | |
1012 | ||
1013 | Then the BODY is executed. | |
1014 | Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'. | |
1015 | If no throw happens, `catch' returns the value of the last BODY form. | |
1016 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1017 | usage: (catch TAG BODY...) */) |
9dbc9081 | 1018 | (args) |
db9f0278 JB |
1019 | Lisp_Object args; |
1020 | { | |
1021 | register Lisp_Object tag; | |
1022 | struct gcpro gcpro1; | |
1023 | ||
1024 | GCPRO1 (args); | |
1025 | tag = Feval (Fcar (args)); | |
1026 | UNGCPRO; | |
1027 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1028 | } | |
1029 | ||
1030 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1031 | FUNC should return a Lisp_Object. | |
1032 | This is how catches are done from within C code. */ | |
1033 | ||
1034 | Lisp_Object | |
1035 | internal_catch (tag, func, arg) | |
1036 | Lisp_Object tag; | |
1037 | Lisp_Object (*func) (); | |
1038 | Lisp_Object arg; | |
1039 | { | |
1040 | /* This structure is made part of the chain `catchlist'. */ | |
1041 | struct catchtag c; | |
1042 | ||
1043 | /* Fill in the components of c, and put it on the list. */ | |
1044 | c.next = catchlist; | |
1045 | c.tag = tag; | |
1046 | c.val = Qnil; | |
1047 | c.backlist = backtrace_list; | |
1048 | c.handlerlist = handlerlist; | |
1049 | c.lisp_eval_depth = lisp_eval_depth; | |
1050 | c.pdlcount = specpdl_ptr - specpdl; | |
1051 | c.poll_suppress_count = poll_suppress_count; | |
1052 | c.gcpro = gcprolist; | |
bcf28080 | 1053 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1054 | catchlist = &c; |
1055 | ||
1056 | /* Call FUNC. */ | |
1057 | if (! _setjmp (c.jmp)) | |
1058 | c.val = (*func) (arg); | |
1059 | ||
1060 | /* Throw works by a longjmp that comes right here. */ | |
1061 | catchlist = c.next; | |
1062 | return c.val; | |
1063 | } | |
1064 | ||
ba410f40 JB |
1065 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1066 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1067 | |
ba410f40 JB |
1068 | This is the guts Fthrow and Fsignal; they differ only in the way |
1069 | they choose the catch tag to throw to. A catch tag for a | |
1070 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1071 | |
ba410f40 JB |
1072 | Before each catch is discarded, unbind all special bindings and |
1073 | execute all unwind-protect clauses made above that catch. Unwind | |
1074 | the handler stack as we go, so that the proper handlers are in | |
1075 | effect for each unwind-protect clause we run. At the end, restore | |
1076 | some static info saved in CATCH, and longjmp to the location | |
1077 | specified in the | |
1078 | ||
1079 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1080 | |
1081 | static void | |
ba410f40 | 1082 | unwind_to_catch (catch, value) |
db9f0278 | 1083 | struct catchtag *catch; |
ba410f40 | 1084 | Lisp_Object value; |
db9f0278 JB |
1085 | { |
1086 | register int last_time; | |
1087 | ||
ba410f40 JB |
1088 | /* Save the value in the tag. */ |
1089 | catch->val = value; | |
1090 | ||
82da7701 | 1091 | /* Restore the polling-suppression count. */ |
1cdc3155 | 1092 | set_poll_suppress_count (catch->poll_suppress_count); |
82da7701 | 1093 | |
db9f0278 JB |
1094 | do |
1095 | { | |
1096 | last_time = catchlist == catch; | |
82da7701 JB |
1097 | |
1098 | /* Unwind the specpdl stack, and then restore the proper set of | |
1099 | handlers. */ | |
db9f0278 JB |
1100 | unbind_to (catchlist->pdlcount, Qnil); |
1101 | handlerlist = catchlist->handlerlist; | |
1102 | catchlist = catchlist->next; | |
1103 | } | |
1104 | while (! last_time); | |
1105 | ||
bcf28080 | 1106 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1107 | gcprolist = catch->gcpro; |
15934ffa RS |
1108 | #ifdef DEBUG_GCPRO |
1109 | if (gcprolist != 0) | |
1110 | gcpro_level = gcprolist->level + 1; | |
1111 | else | |
1112 | gcpro_level = 0; | |
1113 | #endif | |
db9f0278 JB |
1114 | backtrace_list = catch->backlist; |
1115 | lisp_eval_depth = catch->lisp_eval_depth; | |
ba410f40 JB |
1116 | |
1117 | _longjmp (catch->jmp, 1); | |
db9f0278 JB |
1118 | } |
1119 | ||
1120 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
9dbc9081 PJ |
1121 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1122 | Both TAG and VALUE are evalled. */) | |
1123 | (tag, value) | |
79e8bfbf | 1124 | register Lisp_Object tag, value; |
db9f0278 JB |
1125 | { |
1126 | register struct catchtag *c; | |
1127 | ||
1128 | while (1) | |
1129 | { | |
265a9e55 | 1130 | if (!NILP (tag)) |
db9f0278 JB |
1131 | for (c = catchlist; c; c = c->next) |
1132 | { | |
1133 | if (EQ (c->tag, tag)) | |
79e8bfbf | 1134 | unwind_to_catch (c, value); |
db9f0278 | 1135 | } |
79e8bfbf | 1136 | tag = Fsignal (Qno_catch, Fcons (tag, Fcons (value, Qnil))); |
db9f0278 JB |
1137 | } |
1138 | } | |
1139 | ||
1140 | ||
1141 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1142 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1143 | If BODYFORM completes normally, its value is returned | |
1144 | after executing the UNWINDFORMS. | |
1145 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1146 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
9dbc9081 | 1147 | (args) |
db9f0278 JB |
1148 | Lisp_Object args; |
1149 | { | |
1150 | Lisp_Object val; | |
1151 | int count = specpdl_ptr - specpdl; | |
1152 | ||
1153 | record_unwind_protect (0, Fcdr (args)); | |
1154 | val = Feval (Fcar (args)); | |
1155 | return unbind_to (count, val); | |
1156 | } | |
1157 | \f | |
1158 | /* Chain of condition handlers currently in effect. | |
1159 | The elements of this chain are contained in the stack frames | |
1160 | of Fcondition_case and internal_condition_case. | |
1161 | When an error is signaled (by calling Fsignal, below), | |
1162 | this chain is searched for an element that applies. */ | |
1163 | ||
1164 | struct handler *handlerlist; | |
1165 | ||
1166 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
9dbc9081 | 1167 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1168 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1169 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1170 | where the BODY is made of Lisp expressions. | |
1171 | ||
1172 | A handler is applicable to an error | |
1173 | if CONDITION-NAME is one of the error's condition names. | |
1174 | If an error happens, the first applicable handler is run. | |
1175 | ||
1176 | The car of a handler may be a list of condition names | |
1177 | instead of a single condition name. | |
1178 | ||
1179 | When a handler handles an error, | |
1180 | control returns to the condition-case and the handler BODY... is executed | |
1181 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA). | |
1182 | VAR may be nil; then you do not get access to the signal information. | |
1183 | ||
1184 | The value of the last BODY form is returned from the condition-case. | |
1185 | See also the function `signal' for more info. | |
7a25dc6d | 1186 | usage: (condition-case VAR BODYFORM HANDLERS...) */) |
9dbc9081 | 1187 | (args) |
db9f0278 JB |
1188 | Lisp_Object args; |
1189 | { | |
1190 | Lisp_Object val; | |
1191 | struct catchtag c; | |
1192 | struct handler h; | |
17401c97 GM |
1193 | register Lisp_Object bodyform, handlers; |
1194 | volatile Lisp_Object var; | |
db9f0278 | 1195 | |
82da7701 JB |
1196 | var = Fcar (args); |
1197 | bodyform = Fcar (Fcdr (args)); | |
1198 | handlers = Fcdr (Fcdr (args)); | |
b7826503 | 1199 | CHECK_SYMBOL (var); |
82da7701 JB |
1200 | |
1201 | for (val = handlers; ! NILP (val); val = Fcdr (val)) | |
1202 | { | |
1203 | Lisp_Object tem; | |
1204 | tem = Fcar (val); | |
5f96776a RS |
1205 | if (! (NILP (tem) |
1206 | || (CONSP (tem) | |
03699b14 KR |
1207 | && (SYMBOLP (XCAR (tem)) |
1208 | || CONSP (XCAR (tem)))))) | |
82da7701 JB |
1209 | error ("Invalid condition handler", tem); |
1210 | } | |
db9f0278 JB |
1211 | |
1212 | c.tag = Qnil; | |
1213 | c.val = Qnil; | |
1214 | c.backlist = backtrace_list; | |
1215 | c.handlerlist = handlerlist; | |
1216 | c.lisp_eval_depth = lisp_eval_depth; | |
1217 | c.pdlcount = specpdl_ptr - specpdl; | |
1218 | c.poll_suppress_count = poll_suppress_count; | |
1219 | c.gcpro = gcprolist; | |
bcf28080 | 1220 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1221 | if (_setjmp (c.jmp)) |
1222 | { | |
265a9e55 | 1223 | if (!NILP (h.var)) |
9d58218c RS |
1224 | specbind (h.var, c.val); |
1225 | val = Fprogn (Fcdr (h.chosen_clause)); | |
82da7701 JB |
1226 | |
1227 | /* Note that this just undoes the binding of h.var; whoever | |
1228 | longjumped to us unwound the stack to c.pdlcount before | |
1229 | throwing. */ | |
db9f0278 JB |
1230 | unbind_to (c.pdlcount, Qnil); |
1231 | return val; | |
1232 | } | |
1233 | c.next = catchlist; | |
1234 | catchlist = &c; | |
db9f0278 | 1235 | |
82da7701 JB |
1236 | h.var = var; |
1237 | h.handler = handlers; | |
db9f0278 | 1238 | h.next = handlerlist; |
db9f0278 JB |
1239 | h.tag = &c; |
1240 | handlerlist = &h; | |
1241 | ||
82da7701 | 1242 | val = Feval (bodyform); |
db9f0278 JB |
1243 | catchlist = c.next; |
1244 | handlerlist = h.next; | |
1245 | return val; | |
1246 | } | |
1247 | ||
f029ca5f RS |
1248 | /* Call the function BFUN with no arguments, catching errors within it |
1249 | according to HANDLERS. If there is an error, call HFUN with | |
1250 | one argument which is the data that describes the error: | |
1251 | (SIGNALNAME . DATA) | |
1252 | ||
1253 | HANDLERS can be a list of conditions to catch. | |
1254 | If HANDLERS is Qt, catch all errors. | |
1255 | If HANDLERS is Qerror, catch all errors | |
1256 | but allow the debugger to run if that is enabled. */ | |
1257 | ||
db9f0278 JB |
1258 | Lisp_Object |
1259 | internal_condition_case (bfun, handlers, hfun) | |
1260 | Lisp_Object (*bfun) (); | |
1261 | Lisp_Object handlers; | |
1262 | Lisp_Object (*hfun) (); | |
1263 | { | |
1264 | Lisp_Object val; | |
1265 | struct catchtag c; | |
1266 | struct handler h; | |
1267 | ||
dccfb979 AI |
1268 | #if 0 /* Can't do this check anymore because realize_basic_faces has |
1269 | to BLOCK_INPUT, and can call Lisp. What's really needed is a | |
1270 | flag indicating that we're currently handling a signal. */ | |
01591d17 RS |
1271 | /* Since Fsignal resets this to 0, it had better be 0 now |
1272 | or else we have a potential bug. */ | |
1273 | if (interrupt_input_blocked != 0) | |
1274 | abort (); | |
dccfb979 | 1275 | #endif |
01591d17 | 1276 | |
db9f0278 JB |
1277 | c.tag = Qnil; |
1278 | c.val = Qnil; | |
1279 | c.backlist = backtrace_list; | |
1280 | c.handlerlist = handlerlist; | |
1281 | c.lisp_eval_depth = lisp_eval_depth; | |
1282 | c.pdlcount = specpdl_ptr - specpdl; | |
1283 | c.poll_suppress_count = poll_suppress_count; | |
1284 | c.gcpro = gcprolist; | |
bcf28080 | 1285 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1286 | if (_setjmp (c.jmp)) |
1287 | { | |
9d58218c | 1288 | return (*hfun) (c.val); |
db9f0278 JB |
1289 | } |
1290 | c.next = catchlist; | |
1291 | catchlist = &c; | |
1292 | h.handler = handlers; | |
1293 | h.var = Qnil; | |
db9f0278 JB |
1294 | h.next = handlerlist; |
1295 | h.tag = &c; | |
1296 | handlerlist = &h; | |
1297 | ||
1298 | val = (*bfun) (); | |
1299 | catchlist = c.next; | |
1300 | handlerlist = h.next; | |
1301 | return val; | |
1302 | } | |
1303 | ||
f029ca5f RS |
1304 | /* Like internal_condition_case but call HFUN with ARG as its argument. */ |
1305 | ||
d227775c RS |
1306 | Lisp_Object |
1307 | internal_condition_case_1 (bfun, arg, handlers, hfun) | |
1308 | Lisp_Object (*bfun) (); | |
1309 | Lisp_Object arg; | |
1310 | Lisp_Object handlers; | |
1311 | Lisp_Object (*hfun) (); | |
1312 | { | |
1313 | Lisp_Object val; | |
1314 | struct catchtag c; | |
1315 | struct handler h; | |
1316 | ||
1317 | c.tag = Qnil; | |
1318 | c.val = Qnil; | |
1319 | c.backlist = backtrace_list; | |
1320 | c.handlerlist = handlerlist; | |
1321 | c.lisp_eval_depth = lisp_eval_depth; | |
1322 | c.pdlcount = specpdl_ptr - specpdl; | |
1323 | c.poll_suppress_count = poll_suppress_count; | |
1324 | c.gcpro = gcprolist; | |
bcf28080 | 1325 | c.byte_stack = byte_stack_list; |
d227775c RS |
1326 | if (_setjmp (c.jmp)) |
1327 | { | |
9d58218c | 1328 | return (*hfun) (c.val); |
d227775c RS |
1329 | } |
1330 | c.next = catchlist; | |
1331 | catchlist = &c; | |
1332 | h.handler = handlers; | |
1333 | h.var = Qnil; | |
1334 | h.next = handlerlist; | |
1335 | h.tag = &c; | |
1336 | handlerlist = &h; | |
1337 | ||
1338 | val = (*bfun) (arg); | |
1339 | catchlist = c.next; | |
1340 | handlerlist = h.next; | |
1341 | return val; | |
1342 | } | |
10b29d41 GM |
1343 | |
1344 | ||
1345 | /* Like internal_condition_case but call HFUN with NARGS as first, | |
1346 | and ARGS as second argument. */ | |
1347 | ||
1348 | Lisp_Object | |
1349 | internal_condition_case_2 (bfun, nargs, args, handlers, hfun) | |
1350 | Lisp_Object (*bfun) (); | |
1351 | int nargs; | |
1352 | Lisp_Object *args; | |
1353 | Lisp_Object handlers; | |
1354 | Lisp_Object (*hfun) (); | |
1355 | { | |
1356 | Lisp_Object val; | |
1357 | struct catchtag c; | |
1358 | struct handler h; | |
1359 | ||
1360 | c.tag = Qnil; | |
1361 | c.val = Qnil; | |
1362 | c.backlist = backtrace_list; | |
1363 | c.handlerlist = handlerlist; | |
1364 | c.lisp_eval_depth = lisp_eval_depth; | |
1365 | c.pdlcount = specpdl_ptr - specpdl; | |
1366 | c.poll_suppress_count = poll_suppress_count; | |
1367 | c.gcpro = gcprolist; | |
1368 | c.byte_stack = byte_stack_list; | |
1369 | if (_setjmp (c.jmp)) | |
1370 | { | |
1371 | return (*hfun) (c.val); | |
1372 | } | |
1373 | c.next = catchlist; | |
1374 | catchlist = &c; | |
1375 | h.handler = handlers; | |
1376 | h.var = Qnil; | |
1377 | h.next = handlerlist; | |
1378 | h.tag = &c; | |
1379 | handlerlist = &h; | |
1380 | ||
1381 | val = (*bfun) (nargs, args); | |
1382 | catchlist = c.next; | |
1383 | handlerlist = h.next; | |
1384 | return val; | |
1385 | } | |
1386 | ||
d227775c | 1387 | \f |
2901f1d1 SM |
1388 | static Lisp_Object find_handler_clause P_ ((Lisp_Object, Lisp_Object, |
1389 | Lisp_Object, Lisp_Object, | |
1390 | Lisp_Object *)); | |
db9f0278 JB |
1391 | |
1392 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
9dbc9081 PJ |
1393 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1394 | This function does not return. | |
1395 | ||
1396 | An error symbol is a symbol with an `error-conditions' property | |
1397 | that is a list of condition names. | |
1398 | A handler for any of those names will get to handle this signal. | |
1399 | The symbol `error' should normally be one of them. | |
1400 | ||
1401 | DATA should be a list. Its elements are printed as part of the error message. | |
1402 | If the signal is handled, DATA is made available to the handler. | |
1403 | See also the function `condition-case'. */) | |
1404 | (error_symbol, data) | |
4200e719 | 1405 | Lisp_Object error_symbol, data; |
db9f0278 | 1406 | { |
bfa8ca43 AS |
1407 | /* When memory is full, ERROR-SYMBOL is nil, |
1408 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). */ | |
db9f0278 JB |
1409 | register struct handler *allhandlers = handlerlist; |
1410 | Lisp_Object conditions; | |
1411 | extern int gc_in_progress; | |
1412 | extern int waiting_for_input; | |
1413 | Lisp_Object debugger_value; | |
c11d3d17 | 1414 | Lisp_Object string; |
1ea9dec4 | 1415 | Lisp_Object real_error_symbol; |
df6c90d8 | 1416 | extern int display_hourglass_p; |
a2ff3819 | 1417 | struct backtrace *bp; |
db9f0278 | 1418 | |
346598f1 | 1419 | immediate_quit = handling_signal = 0; |
db9f0278 JB |
1420 | if (gc_in_progress || waiting_for_input) |
1421 | abort (); | |
1422 | ||
1423 | TOTALLY_UNBLOCK_INPUT; | |
1424 | ||
1ea9dec4 RS |
1425 | if (NILP (error_symbol)) |
1426 | real_error_symbol = Fcar (data); | |
1427 | else | |
1428 | real_error_symbol = error_symbol; | |
1429 | ||
48f8dfa3 | 1430 | #ifdef HAVE_X_WINDOWS |
df6c90d8 GM |
1431 | if (display_hourglass_p) |
1432 | cancel_hourglass (); | |
48f8dfa3 | 1433 | #endif |
48f8dfa3 | 1434 | |
61ede770 RS |
1435 | /* This hook is used by edebug. */ |
1436 | if (! NILP (Vsignal_hook_function)) | |
f01a9c5b | 1437 | call2 (Vsignal_hook_function, error_symbol, data); |
61ede770 | 1438 | |
1ea9dec4 | 1439 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1440 | |
a2ff3819 GM |
1441 | /* Remember from where signal was called. Skip over the frame for |
1442 | `signal' itself. If a frame for `error' follows, skip that, | |
1443 | too. */ | |
090a072f GM |
1444 | Vsignaling_function = Qnil; |
1445 | if (backtrace_list) | |
1446 | { | |
1447 | bp = backtrace_list->next; | |
1448 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1449 | bp = bp->next; | |
1450 | if (bp && bp->function) | |
1451 | Vsignaling_function = *bp->function; | |
1452 | } | |
a2ff3819 | 1453 | |
db9f0278 JB |
1454 | for (; handlerlist; handlerlist = handlerlist->next) |
1455 | { | |
1456 | register Lisp_Object clause; | |
8515044c GM |
1457 | |
1458 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1459 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1460 | ||
1461 | if (specpdl_size + 40 > max_specpdl_size) | |
1462 | max_specpdl_size = specpdl_size + 40; | |
1463 | ||
db9f0278 | 1464 | clause = find_handler_clause (handlerlist->handler, conditions, |
4200e719 | 1465 | error_symbol, data, &debugger_value); |
db9f0278 JB |
1466 | |
1467 | #if 0 /* Most callers are not prepared to handle gc if this returns. | |
1468 | So, since this feature is not very useful, take it out. */ | |
1469 | /* If have called debugger and user wants to continue, | |
1470 | just return nil. */ | |
1471 | if (EQ (clause, Qlambda)) | |
1472 | return debugger_value; | |
1473 | #else | |
1474 | if (EQ (clause, Qlambda)) | |
82da7701 | 1475 | { |
690337b7 KH |
1476 | /* We can't return values to code which signaled an error, but we |
1477 | can continue code which has signaled a quit. */ | |
1ea9dec4 | 1478 | if (EQ (real_error_symbol, Qquit)) |
82da7701 JB |
1479 | return Qnil; |
1480 | else | |
d3e6f8be | 1481 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1482 | } |
db9f0278 JB |
1483 | #endif |
1484 | ||
265a9e55 | 1485 | if (!NILP (clause)) |
db9f0278 | 1486 | { |
9d58218c | 1487 | Lisp_Object unwind_data; |
db9f0278 | 1488 | struct handler *h = handlerlist; |
9d58218c | 1489 | |
db9f0278 | 1490 | handlerlist = allhandlers; |
1ea9dec4 RS |
1491 | |
1492 | if (NILP (error_symbol)) | |
1493 | unwind_data = data; | |
9d58218c RS |
1494 | else |
1495 | unwind_data = Fcons (error_symbol, data); | |
1496 | h->chosen_clause = clause; | |
1497 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1498 | } |
1499 | } | |
1500 | ||
1501 | handlerlist = allhandlers; | |
1502 | /* If no handler is present now, try to run the debugger, | |
1503 | and if that fails, throw to top level. */ | |
4200e719 | 1504 | find_handler_clause (Qerror, conditions, error_symbol, data, &debugger_value); |
c11d3d17 RS |
1505 | if (catchlist != 0) |
1506 | Fthrow (Qtop_level, Qt); | |
1507 | ||
1ea9dec4 | 1508 | if (! NILP (error_symbol)) |
c11d3d17 RS |
1509 | data = Fcons (error_symbol, data); |
1510 | ||
1511 | string = Ferror_message_string (data); | |
377127ce | 1512 | fatal ("%s", XSTRING (string)->data, 0); |
db9f0278 JB |
1513 | } |
1514 | ||
128c0f66 RM |
1515 | /* Return nonzero iff LIST is a non-nil atom or |
1516 | a list containing one of CONDITIONS. */ | |
1517 | ||
1518 | static int | |
1519 | wants_debugger (list, conditions) | |
1520 | Lisp_Object list, conditions; | |
1521 | { | |
4de86b16 | 1522 | if (NILP (list)) |
128c0f66 RM |
1523 | return 0; |
1524 | if (! CONSP (list)) | |
1525 | return 1; | |
1526 | ||
ab67260b | 1527 | while (CONSP (conditions)) |
128c0f66 | 1528 | { |
ab67260b | 1529 | Lisp_Object this, tail; |
03699b14 KR |
1530 | this = XCAR (conditions); |
1531 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1532 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1533 | return 1; |
03699b14 | 1534 | conditions = XCDR (conditions); |
128c0f66 | 1535 | } |
ab67260b | 1536 | return 0; |
128c0f66 RM |
1537 | } |
1538 | ||
fc950e09 KH |
1539 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1540 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1541 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1542 | |
1543 | static int | |
1544 | skip_debugger (conditions, data) | |
1545 | Lisp_Object conditions, data; | |
1546 | { | |
1547 | Lisp_Object tail; | |
1548 | int first_string = 1; | |
1549 | Lisp_Object error_message; | |
1550 | ||
17401c97 GM |
1551 | error_message = Qnil; |
1552 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1553 | { |
03699b14 | 1554 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1555 | { |
1556 | if (first_string) | |
1557 | { | |
1558 | error_message = Ferror_message_string (data); | |
1559 | first_string = 0; | |
1560 | } | |
17401c97 | 1561 | |
03699b14 | 1562 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1563 | return 1; |
1564 | } | |
1565 | else | |
1566 | { | |
1567 | Lisp_Object contail; | |
1568 | ||
17401c97 | 1569 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1570 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1571 | return 1; |
1572 | } | |
1573 | } | |
1574 | ||
1575 | return 0; | |
1576 | } | |
1577 | ||
128c0f66 | 1578 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1579 | There are two ways to pass SIG and DATA: |
9b942ebd | 1580 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1581 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1582 | This is for memory-full errors only. |
1ea9dec4 | 1583 | |
128c0f66 | 1584 | Store value returned from debugger into *DEBUGGER_VALUE_PTR. */ |
db9f0278 JB |
1585 | |
1586 | static Lisp_Object | |
1587 | find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr) | |
1588 | Lisp_Object handlers, conditions, sig, data; | |
1589 | Lisp_Object *debugger_value_ptr; | |
1590 | { | |
1591 | register Lisp_Object h; | |
1592 | register Lisp_Object tem; | |
db9f0278 JB |
1593 | |
1594 | if (EQ (handlers, Qt)) /* t is used by handlers for all conditions, set up by C code. */ | |
1595 | return Qt; | |
61ede770 RS |
1596 | /* error is used similarly, but means print an error message |
1597 | and run the debugger if that is enabled. */ | |
1598 | if (EQ (handlers, Qerror) | |
57a6e758 RS |
1599 | || !NILP (Vdebug_on_signal)) /* This says call debugger even if |
1600 | there is a handler. */ | |
db9f0278 | 1601 | { |
61ede770 RS |
1602 | int count = specpdl_ptr - specpdl; |
1603 | int debugger_called = 0; | |
1ea9dec4 | 1604 | Lisp_Object sig_symbol, combined_data; |
9b942ebd RS |
1605 | /* This is set to 1 if we are handling a memory-full error, |
1606 | because these must not run the debugger. | |
1607 | (There is no room in memory to do that!) */ | |
1608 | int no_debugger = 0; | |
1ea9dec4 RS |
1609 | |
1610 | if (NILP (sig)) | |
1611 | { | |
1612 | combined_data = data; | |
1613 | sig_symbol = Fcar (data); | |
9b942ebd | 1614 | no_debugger = 1; |
1ea9dec4 RS |
1615 | } |
1616 | else | |
1617 | { | |
1618 | combined_data = Fcons (sig, data); | |
1619 | sig_symbol = sig; | |
1620 | } | |
61ede770 | 1621 | |
128c0f66 | 1622 | if (wants_debugger (Vstack_trace_on_error, conditions)) |
88817f3b | 1623 | { |
b369fa65 | 1624 | #ifdef PROTOTYPES |
88817f3b RS |
1625 | internal_with_output_to_temp_buffer ("*Backtrace*", |
1626 | (Lisp_Object (*) (Lisp_Object)) Fbacktrace, | |
1627 | Qnil); | |
1628 | #else | |
1629 | internal_with_output_to_temp_buffer ("*Backtrace*", | |
1630 | Fbacktrace, Qnil); | |
1631 | #endif | |
1632 | } | |
9b942ebd RS |
1633 | if (! no_debugger |
1634 | && (EQ (sig_symbol, Qquit) | |
1635 | ? debug_on_quit | |
1636 | : wants_debugger (Vdebug_on_error, conditions)) | |
1ea9dec4 | 1637 | && ! skip_debugger (conditions, combined_data) |
be857679 | 1638 | && when_entered_debugger < num_nonmacro_input_events) |
db9f0278 | 1639 | { |
db9f0278 | 1640 | specbind (Qdebug_on_error, Qnil); |
fc950e09 KH |
1641 | *debugger_value_ptr |
1642 | = call_debugger (Fcons (Qerror, | |
1ea9dec4 | 1643 | Fcons (combined_data, Qnil))); |
61ede770 RS |
1644 | debugger_called = 1; |
1645 | } | |
1646 | /* If there is no handler, return saying whether we ran the debugger. */ | |
1647 | if (EQ (handlers, Qerror)) | |
1648 | { | |
1649 | if (debugger_called) | |
1650 | return unbind_to (count, Qlambda); | |
1651 | return Qt; | |
db9f0278 | 1652 | } |
db9f0278 JB |
1653 | } |
1654 | for (h = handlers; CONSP (h); h = Fcdr (h)) | |
1655 | { | |
5f96776a RS |
1656 | Lisp_Object handler, condit; |
1657 | ||
1658 | handler = Fcar (h); | |
1659 | if (!CONSP (handler)) | |
db9f0278 | 1660 | continue; |
5f96776a RS |
1661 | condit = Fcar (handler); |
1662 | /* Handle a single condition name in handler HANDLER. */ | |
1663 | if (SYMBOLP (condit)) | |
1664 | { | |
1665 | tem = Fmemq (Fcar (handler), conditions); | |
1666 | if (!NILP (tem)) | |
1667 | return handler; | |
1668 | } | |
1669 | /* Handle a list of condition names in handler HANDLER. */ | |
1670 | else if (CONSP (condit)) | |
1671 | { | |
1672 | while (CONSP (condit)) | |
1673 | { | |
1674 | tem = Fmemq (Fcar (condit), conditions); | |
1675 | if (!NILP (tem)) | |
1676 | return handler; | |
03699b14 | 1677 | condit = XCDR (condit); |
5f96776a RS |
1678 | } |
1679 | } | |
db9f0278 JB |
1680 | } |
1681 | return Qnil; | |
1682 | } | |
1683 | ||
1684 | /* dump an error message; called like printf */ | |
1685 | ||
1686 | /* VARARGS 1 */ | |
1687 | void | |
1688 | error (m, a1, a2, a3) | |
1689 | char *m; | |
9125da08 | 1690 | char *a1, *a2, *a3; |
db9f0278 JB |
1691 | { |
1692 | char buf[200]; | |
9125da08 RS |
1693 | int size = 200; |
1694 | int mlen; | |
1695 | char *buffer = buf; | |
1696 | char *args[3]; | |
1697 | int allocated = 0; | |
1698 | Lisp_Object string; | |
1699 | ||
1700 | args[0] = a1; | |
1701 | args[1] = a2; | |
1702 | args[2] = a3; | |
1703 | ||
1704 | mlen = strlen (m); | |
db9f0278 JB |
1705 | |
1706 | while (1) | |
9125da08 | 1707 | { |
955f3ff9 | 1708 | int used = doprnt (buffer, size, m, m + mlen, 3, args); |
9125da08 RS |
1709 | if (used < size) |
1710 | break; | |
1711 | size *= 2; | |
1712 | if (allocated) | |
1713 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
1714 | else |
1715 | { | |
1716 | buffer = (char *) xmalloc (size); | |
1717 | allocated = 1; | |
1718 | } | |
9125da08 RS |
1719 | } |
1720 | ||
955f3ff9 | 1721 | string = build_string (buffer); |
9125da08 | 1722 | if (allocated) |
9ae6734f | 1723 | xfree (buffer); |
9125da08 RS |
1724 | |
1725 | Fsignal (Qerror, Fcons (string, Qnil)); | |
9402dba5 | 1726 | abort (); |
db9f0278 JB |
1727 | } |
1728 | \f | |
1729 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 1, 0, | |
9dbc9081 PJ |
1730 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
1731 | This means it contains a description for how to read arguments to give it. | |
1732 | The value is nil for an invalid function or a symbol with no function | |
1733 | definition. | |
1734 | ||
1735 | Interactively callable functions include strings and vectors (treated | |
1736 | as keyboard macros), lambda-expressions that contain a top-level call | |
1737 | to `interactive', autoload definitions made by `autoload' with non-nil | |
1738 | fourth argument, and some of the built-in functions of Lisp. | |
1739 | ||
1740 | Also, a symbol satisfies `commandp' if its function definition does so. */) | |
1741 | (function) | |
db9f0278 JB |
1742 | Lisp_Object function; |
1743 | { | |
1744 | register Lisp_Object fun; | |
1745 | register Lisp_Object funcar; | |
db9f0278 JB |
1746 | |
1747 | fun = function; | |
1748 | ||
ffd56f97 JB |
1749 | fun = indirect_function (fun); |
1750 | if (EQ (fun, Qunbound)) | |
1751 | return Qnil; | |
db9f0278 JB |
1752 | |
1753 | /* Emacs primitives are interactive if their DEFUN specifies an | |
1754 | interactive spec. */ | |
90165123 | 1755 | if (SUBRP (fun)) |
db9f0278 JB |
1756 | { |
1757 | if (XSUBR (fun)->prompt) | |
1758 | return Qt; | |
1759 | else | |
1760 | return Qnil; | |
1761 | } | |
1762 | ||
1763 | /* Bytecode objects are interactive if they are long enough to | |
1764 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1765 | where the interactive spec is stored. */ | |
90165123 | 1766 | else if (COMPILEDP (fun)) |
845975f5 | 1767 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
db9f0278 JB |
1768 | ? Qt : Qnil); |
1769 | ||
1770 | /* Strings and vectors are keyboard macros. */ | |
90165123 | 1771 | if (STRINGP (fun) || VECTORP (fun)) |
db9f0278 JB |
1772 | return Qt; |
1773 | ||
1774 | /* Lists may represent commands. */ | |
1775 | if (!CONSP (fun)) | |
1776 | return Qnil; | |
1777 | funcar = Fcar (fun); | |
90165123 | 1778 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
1779 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
1780 | if (EQ (funcar, Qlambda)) | |
1781 | return Fassq (Qinteractive, Fcdr (Fcdr (fun))); | |
db9f0278 JB |
1782 | if (EQ (funcar, Qautoload)) |
1783 | return Fcar (Fcdr (Fcdr (Fcdr (fun)))); | |
1784 | else | |
1785 | return Qnil; | |
1786 | } | |
1787 | ||
1788 | /* ARGSUSED */ | |
1789 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, | |
9dbc9081 PJ |
1790 | doc: /* Define FUNCTION to autoload from FILE. |
1791 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
1792 | Third arg DOCSTRING is documentation for the function. | |
1793 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
1794 | Fifth arg TYPE indicates the type of the object: | |
1795 | nil or omitted says FUNCTION is a function, | |
1796 | `keymap' says FUNCTION is really a keymap, and | |
1797 | `macro' or t says FUNCTION is really a macro. | |
1798 | Third through fifth args give info about the real definition. | |
1799 | They default to nil. | |
1800 | If FUNCTION is already defined other than as an autoload, | |
1801 | this does nothing and returns nil. */) | |
1802 | (function, file, docstring, interactive, type) | |
ee9ee63c | 1803 | Lisp_Object function, file, docstring, interactive, type; |
db9f0278 JB |
1804 | { |
1805 | #ifdef NO_ARG_ARRAY | |
1806 | Lisp_Object args[4]; | |
1807 | #endif | |
1808 | ||
b7826503 PJ |
1809 | CHECK_SYMBOL (function); |
1810 | CHECK_STRING (file); | |
db9f0278 JB |
1811 | |
1812 | /* If function is defined and not as an autoload, don't override */ | |
1813 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 1814 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 1815 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
1816 | return Qnil; |
1817 | ||
7973e637 SM |
1818 | if (NILP (Vpurify_flag)) |
1819 | /* Only add entries after dumping, because the ones before are | |
1820 | not useful and else we get loads of them from the loaddefs.el. */ | |
1821 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
1822 | ||
db9f0278 JB |
1823 | #ifdef NO_ARG_ARRAY |
1824 | args[0] = file; | |
1825 | args[1] = docstring; | |
1826 | args[2] = interactive; | |
ee9ee63c | 1827 | args[3] = type; |
db9f0278 JB |
1828 | |
1829 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); | |
1830 | #else /* NO_ARG_ARRAY */ | |
1831 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); | |
1832 | #endif /* not NO_ARG_ARRAY */ | |
1833 | } | |
1834 | ||
1835 | Lisp_Object | |
1836 | un_autoload (oldqueue) | |
1837 | Lisp_Object oldqueue; | |
1838 | { | |
1839 | register Lisp_Object queue, first, second; | |
1840 | ||
1841 | /* Queue to unwind is current value of Vautoload_queue. | |
1842 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1843 | queue = Vautoload_queue; | |
1844 | Vautoload_queue = oldqueue; | |
1845 | while (CONSP (queue)) | |
1846 | { | |
1847 | first = Fcar (queue); | |
1848 | second = Fcdr (first); | |
1849 | first = Fcar (first); | |
1850 | if (EQ (second, Qnil)) | |
1851 | Vfeatures = first; | |
1852 | else | |
1853 | Ffset (first, second); | |
1854 | queue = Fcdr (queue); | |
1855 | } | |
1856 | return Qnil; | |
1857 | } | |
1858 | ||
ca20916b RS |
1859 | /* Load an autoloaded function. |
1860 | FUNNAME is the symbol which is the function's name. | |
1861 | FUNDEF is the autoload definition (a list). */ | |
1862 | ||
045ba794 | 1863 | void |
db9f0278 JB |
1864 | do_autoload (fundef, funname) |
1865 | Lisp_Object fundef, funname; | |
1866 | { | |
1867 | int count = specpdl_ptr - specpdl; | |
cb81ac97 | 1868 | Lisp_Object fun, queue, first, second; |
ca20916b | 1869 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 JB |
1870 | |
1871 | fun = funname; | |
b7826503 | 1872 | CHECK_SYMBOL (funname); |
ca20916b | 1873 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 1874 | |
f87740dc RS |
1875 | /* Preserve the match data. */ |
1876 | record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil)); | |
1877 | ||
1878 | /* Value saved here is to be restored into Vautoload_queue. */ | |
db9f0278 JB |
1879 | record_unwind_protect (un_autoload, Vautoload_queue); |
1880 | Vautoload_queue = Qt; | |
4aac2302 | 1881 | Fload (Fcar (Fcdr (fundef)), Qnil, noninteractive ? Qt : Qnil, Qnil, Qt); |
2a49b6e5 | 1882 | |
f87740dc | 1883 | /* Save the old autoloads, in case we ever do an unload. */ |
2a49b6e5 RS |
1884 | queue = Vautoload_queue; |
1885 | while (CONSP (queue)) | |
1886 | { | |
1887 | first = Fcar (queue); | |
1888 | second = Fcdr (first); | |
1889 | first = Fcar (first); | |
5739ce6b ER |
1890 | |
1891 | /* Note: This test is subtle. The cdr of an autoload-queue entry | |
1892 | may be an atom if the autoload entry was generated by a defalias | |
f87740dc | 1893 | or fset. */ |
5739ce6b | 1894 | if (CONSP (second)) |
03e267c2 | 1895 | Fput (first, Qautoload, (Fcdr (second))); |
5739ce6b | 1896 | |
2a49b6e5 RS |
1897 | queue = Fcdr (queue); |
1898 | } | |
1899 | ||
db9f0278 JB |
1900 | /* Once loading finishes, don't undo it. */ |
1901 | Vautoload_queue = Qt; | |
1902 | unbind_to (count, Qnil); | |
1903 | ||
ffd56f97 JB |
1904 | fun = Findirect_function (fun); |
1905 | ||
76c2b0cc | 1906 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 JB |
1907 | error ("Autoloading failed to define function %s", |
1908 | XSYMBOL (funname)->name->data); | |
ca20916b | 1909 | UNGCPRO; |
db9f0278 | 1910 | } |
4c576a83 | 1911 | |
db9f0278 JB |
1912 | \f |
1913 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
9dbc9081 PJ |
1914 | doc: /* Evaluate FORM and return its value. */) |
1915 | (form) | |
db9f0278 JB |
1916 | Lisp_Object form; |
1917 | { | |
1918 | Lisp_Object fun, val, original_fun, original_args; | |
1919 | Lisp_Object funcar; | |
1920 | struct backtrace backtrace; | |
1921 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1922 | ||
4c576a83 | 1923 | if (handling_signal) |
48f8dfa3 GM |
1924 | abort (); |
1925 | ||
90165123 | 1926 | if (SYMBOLP (form)) |
2b9bde76 | 1927 | return Fsymbol_value (form); |
db9f0278 JB |
1928 | if (!CONSP (form)) |
1929 | return form; | |
1930 | ||
1931 | QUIT; | |
1932 | if (consing_since_gc > gc_cons_threshold) | |
1933 | { | |
1934 | GCPRO1 (form); | |
1935 | Fgarbage_collect (); | |
1936 | UNGCPRO; | |
1937 | } | |
1938 | ||
1939 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1940 | { | |
1941 | if (max_lisp_eval_depth < 100) | |
1942 | max_lisp_eval_depth = 100; | |
1943 | if (lisp_eval_depth > max_lisp_eval_depth) | |
1944 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
1945 | } | |
1946 | ||
1947 | original_fun = Fcar (form); | |
1948 | original_args = Fcdr (form); | |
1949 | ||
1950 | backtrace.next = backtrace_list; | |
1951 | backtrace_list = &backtrace; | |
1952 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
1953 | backtrace.args = &original_args; | |
1954 | backtrace.nargs = UNEVALLED; | |
1955 | backtrace.evalargs = 1; | |
1956 | backtrace.debug_on_exit = 0; | |
1957 | ||
1958 | if (debug_on_next_call) | |
1959 | do_debug_on_call (Qt); | |
1960 | ||
1961 | /* At this point, only original_fun and original_args | |
1962 | have values that will be used below */ | |
1963 | retry: | |
ffd56f97 | 1964 | fun = Findirect_function (original_fun); |
db9f0278 | 1965 | |
90165123 | 1966 | if (SUBRP (fun)) |
db9f0278 JB |
1967 | { |
1968 | Lisp_Object numargs; | |
166c822d | 1969 | Lisp_Object argvals[8]; |
db9f0278 JB |
1970 | Lisp_Object args_left; |
1971 | register int i, maxargs; | |
1972 | ||
1973 | args_left = original_args; | |
1974 | numargs = Flength (args_left); | |
1975 | ||
1976 | if (XINT (numargs) < XSUBR (fun)->min_args || | |
1977 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
1978 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
1979 | ||
1980 | if (XSUBR (fun)->max_args == UNEVALLED) | |
1981 | { | |
1982 | backtrace.evalargs = 0; | |
1983 | val = (*XSUBR (fun)->function) (args_left); | |
1984 | goto done; | |
1985 | } | |
1986 | ||
1987 | if (XSUBR (fun)->max_args == MANY) | |
1988 | { | |
1989 | /* Pass a vector of evaluated arguments */ | |
1990 | Lisp_Object *vals; | |
1991 | register int argnum = 0; | |
1992 | ||
1993 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
1994 | ||
1995 | GCPRO3 (args_left, fun, fun); | |
1996 | gcpro3.var = vals; | |
1997 | gcpro3.nvars = 0; | |
1998 | ||
265a9e55 | 1999 | while (!NILP (args_left)) |
db9f0278 JB |
2000 | { |
2001 | vals[argnum++] = Feval (Fcar (args_left)); | |
2002 | args_left = Fcdr (args_left); | |
2003 | gcpro3.nvars = argnum; | |
2004 | } | |
db9f0278 JB |
2005 | |
2006 | backtrace.args = vals; | |
2007 | backtrace.nargs = XINT (numargs); | |
2008 | ||
2009 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 2010 | UNGCPRO; |
db9f0278 JB |
2011 | goto done; |
2012 | } | |
2013 | ||
2014 | GCPRO3 (args_left, fun, fun); | |
2015 | gcpro3.var = argvals; | |
2016 | gcpro3.nvars = 0; | |
2017 | ||
2018 | maxargs = XSUBR (fun)->max_args; | |
2019 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2020 | { | |
2021 | argvals[i] = Feval (Fcar (args_left)); | |
2022 | gcpro3.nvars = ++i; | |
2023 | } | |
2024 | ||
2025 | UNGCPRO; | |
2026 | ||
2027 | backtrace.args = argvals; | |
2028 | backtrace.nargs = XINT (numargs); | |
2029 | ||
2030 | switch (i) | |
2031 | { | |
2032 | case 0: | |
2033 | val = (*XSUBR (fun)->function) (); | |
2034 | goto done; | |
2035 | case 1: | |
2036 | val = (*XSUBR (fun)->function) (argvals[0]); | |
2037 | goto done; | |
2038 | case 2: | |
2039 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
2040 | goto done; | |
2041 | case 3: | |
2042 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2043 | argvals[2]); | |
2044 | goto done; | |
2045 | case 4: | |
2046 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2047 | argvals[2], argvals[3]); | |
2048 | goto done; | |
2049 | case 5: | |
2050 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2051 | argvals[3], argvals[4]); | |
2052 | goto done; | |
2053 | case 6: | |
2054 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2055 | argvals[3], argvals[4], argvals[5]); | |
2056 | goto done; | |
15c65264 RS |
2057 | case 7: |
2058 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2059 | argvals[3], argvals[4], argvals[5], | |
2060 | argvals[6]); | |
2061 | goto done; | |
db9f0278 | 2062 | |
166c822d KH |
2063 | case 8: |
2064 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2065 | argvals[3], argvals[4], argvals[5], | |
2066 | argvals[6], argvals[7]); | |
2067 | goto done; | |
2068 | ||
db9f0278 | 2069 | default: |
08564963 JB |
2070 | /* Someone has created a subr that takes more arguments than |
2071 | is supported by this code. We need to either rewrite the | |
2072 | subr to use a different argument protocol, or add more | |
2073 | cases to this switch. */ | |
2074 | abort (); | |
db9f0278 JB |
2075 | } |
2076 | } | |
90165123 | 2077 | if (COMPILEDP (fun)) |
db9f0278 JB |
2078 | val = apply_lambda (fun, original_args, 1); |
2079 | else | |
2080 | { | |
2081 | if (!CONSP (fun)) | |
2082 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2083 | funcar = Fcar (fun); | |
90165123 | 2084 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
2085 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
2086 | if (EQ (funcar, Qautoload)) | |
2087 | { | |
2088 | do_autoload (fun, original_fun); | |
2089 | goto retry; | |
2090 | } | |
2091 | if (EQ (funcar, Qmacro)) | |
2092 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
2093 | else if (EQ (funcar, Qlambda)) | |
2094 | val = apply_lambda (fun, original_args, 1); | |
db9f0278 JB |
2095 | else |
2096 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2097 | } | |
2098 | done: | |
db9f0278 JB |
2099 | lisp_eval_depth--; |
2100 | if (backtrace.debug_on_exit) | |
2101 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2102 | backtrace_list = backtrace.next; | |
2103 | return val; | |
2104 | } | |
2105 | \f | |
2106 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
9dbc9081 PJ |
2107 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2108 | Then return the value FUNCTION returns. | |
2109 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2110 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
2111 | (nargs, args) | |
db9f0278 JB |
2112 | int nargs; |
2113 | Lisp_Object *args; | |
2114 | { | |
2115 | register int i, numargs; | |
2116 | register Lisp_Object spread_arg; | |
2117 | register Lisp_Object *funcall_args; | |
db9f0278 | 2118 | Lisp_Object fun; |
a6e3fa71 | 2119 | struct gcpro gcpro1; |
db9f0278 JB |
2120 | |
2121 | fun = args [0]; | |
2122 | funcall_args = 0; | |
2123 | spread_arg = args [nargs - 1]; | |
b7826503 | 2124 | CHECK_LIST (spread_arg); |
db9f0278 JB |
2125 | |
2126 | numargs = XINT (Flength (spread_arg)); | |
2127 | ||
2128 | if (numargs == 0) | |
2129 | return Ffuncall (nargs - 1, args); | |
2130 | else if (numargs == 1) | |
2131 | { | |
03699b14 | 2132 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2133 | return Ffuncall (nargs, args); |
2134 | } | |
2135 | ||
a6e3fa71 | 2136 | numargs += nargs - 2; |
db9f0278 | 2137 | |
ffd56f97 JB |
2138 | fun = indirect_function (fun); |
2139 | if (EQ (fun, Qunbound)) | |
db9f0278 | 2140 | { |
ffd56f97 JB |
2141 | /* Let funcall get the error */ |
2142 | fun = args[0]; | |
2143 | goto funcall; | |
db9f0278 JB |
2144 | } |
2145 | ||
90165123 | 2146 | if (SUBRP (fun)) |
db9f0278 JB |
2147 | { |
2148 | if (numargs < XSUBR (fun)->min_args | |
2149 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2150 | goto funcall; /* Let funcall get the error */ | |
2151 | else if (XSUBR (fun)->max_args > numargs) | |
2152 | { | |
2153 | /* Avoid making funcall cons up a yet another new vector of arguments | |
2154 | by explicitly supplying nil's for optional values */ | |
2155 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
2156 | * sizeof (Lisp_Object)); | |
2157 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
2158 | funcall_args[++i] = Qnil; | |
a6e3fa71 JB |
2159 | GCPRO1 (*funcall_args); |
2160 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2161 | } |
2162 | } | |
2163 | funcall: | |
2164 | /* We add 1 to numargs because funcall_args includes the | |
2165 | function itself as well as its arguments. */ | |
2166 | if (!funcall_args) | |
a6e3fa71 JB |
2167 | { |
2168 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
2169 | * sizeof (Lisp_Object)); | |
2170 | GCPRO1 (*funcall_args); | |
2171 | gcpro1.nvars = 1 + numargs; | |
2172 | } | |
2173 | ||
db9f0278 JB |
2174 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
2175 | /* Spread the last arg we got. Its first element goes in | |
2176 | the slot that it used to occupy, hence this value of I. */ | |
2177 | i = nargs - 1; | |
265a9e55 | 2178 | while (!NILP (spread_arg)) |
db9f0278 | 2179 | { |
03699b14 KR |
2180 | funcall_args [i++] = XCAR (spread_arg); |
2181 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2182 | } |
a6e3fa71 JB |
2183 | |
2184 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
2185 | } |
2186 | \f | |
ff936e53 SM |
2187 | /* Run hook variables in various ways. */ |
2188 | ||
2189 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
2901f1d1 SM |
2190 | static Lisp_Object run_hook_with_args P_ ((int, Lisp_Object *, |
2191 | enum run_hooks_condition)); | |
ff936e53 | 2192 | |
8b5176cd | 2193 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9dbc9081 PJ |
2194 | doc: /* Run each hook in HOOKS. Major mode functions use this. |
2195 | Each argument should be a symbol, a hook variable. | |
2196 | These symbols are processed in the order specified. | |
2197 | If a hook symbol has a non-nil value, that value may be a function | |
2198 | or a list of functions to be called to run the hook. | |
2199 | If the value is a function, it is called with no arguments. | |
2200 | If it is a list, the elements are called, in order, with no arguments. | |
2201 | ||
72e85d5d RS |
2202 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2203 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2204 | usage: (run-hooks &rest HOOKS) */) |
2205 | (nargs, args) | |
ff936e53 SM |
2206 | int nargs; |
2207 | Lisp_Object *args; | |
2208 | { | |
2209 | Lisp_Object hook[1]; | |
2210 | register int i; | |
2211 | ||
2212 | for (i = 0; i < nargs; i++) | |
2213 | { | |
2214 | hook[0] = args[i]; | |
2215 | run_hook_with_args (1, hook, to_completion); | |
2216 | } | |
2217 | ||
2218 | return Qnil; | |
2219 | } | |
2220 | ||
a0d76c27 | 2221 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2222 | Srun_hook_with_args, 1, MANY, 0, |
2223 | doc: /* Run HOOK with the specified arguments ARGS. | |
2224 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2225 | value, that value may be a function or a list of functions to be | |
2226 | called to run the hook. If the value is a function, it is called with | |
2227 | the given arguments and its return value is returned. If it is a list | |
2228 | of functions, those functions are called, in order, | |
2229 | with the given arguments ARGS. | |
2230 | It is best not to depend on the value return by `run-hook-with-args', | |
2231 | as that may change. | |
2232 | ||
72e85d5d RS |
2233 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2234 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2235 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
2236 | (nargs, args) | |
ff936e53 SM |
2237 | int nargs; |
2238 | Lisp_Object *args; | |
2239 | { | |
2240 | return run_hook_with_args (nargs, args, to_completion); | |
2241 | } | |
2242 | ||
a0d76c27 | 2243 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2244 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2245 | doc: /* Run HOOK with the specified arguments ARGS. | |
2246 | HOOK should be a symbol, a hook variable. Its value should | |
2247 | be a list of functions. We call those functions, one by one, | |
2248 | passing arguments ARGS to each of them, until one of them | |
2249 | returns a non-nil value. Then we return that value. | |
2250 | If all the functions return nil, we return nil. | |
2251 | ||
72e85d5d RS |
2252 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2253 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2254 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
2255 | (nargs, args) | |
b0b667cb KH |
2256 | int nargs; |
2257 | Lisp_Object *args; | |
2258 | { | |
ff936e53 SM |
2259 | return run_hook_with_args (nargs, args, until_success); |
2260 | } | |
2261 | ||
a0d76c27 | 2262 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2263 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2264 | doc: /* Run HOOK with the specified arguments ARGS. | |
2265 | HOOK should be a symbol, a hook variable. Its value should | |
2266 | be a list of functions. We call those functions, one by one, | |
2267 | passing arguments ARGS to each of them, until one of them | |
2268 | returns nil. Then we return nil. | |
2269 | If all the functions return non-nil, we return non-nil. | |
2270 | ||
72e85d5d RS |
2271 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2272 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2273 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
2274 | (nargs, args) | |
ff936e53 SM |
2275 | int nargs; |
2276 | Lisp_Object *args; | |
2277 | { | |
2278 | return run_hook_with_args (nargs, args, until_failure); | |
2279 | } | |
2280 | ||
c933ea05 RS |
2281 | /* ARGS[0] should be a hook symbol. |
2282 | Call each of the functions in the hook value, passing each of them | |
2283 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2284 | COND specifies a condition to test after each call | |
2285 | to decide whether to stop. | |
2286 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2287 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2288 | ||
2901f1d1 | 2289 | static Lisp_Object |
ff936e53 SM |
2290 | run_hook_with_args (nargs, args, cond) |
2291 | int nargs; | |
2292 | Lisp_Object *args; | |
2293 | enum run_hooks_condition cond; | |
2294 | { | |
2295 | Lisp_Object sym, val, ret; | |
fada05d6 KH |
2296 | Lisp_Object globals; |
2297 | struct gcpro gcpro1, gcpro2, gcpro3; | |
b0b667cb | 2298 | |
f029ca5f RS |
2299 | /* If we are dying or still initializing, |
2300 | don't do anything--it would probably crash if we tried. */ | |
2301 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2302 | return Qnil; |
f029ca5f | 2303 | |
b0b667cb | 2304 | sym = args[0]; |
aa681b51 | 2305 | val = find_symbol_value (sym); |
ff936e53 SM |
2306 | ret = (cond == until_failure ? Qt : Qnil); |
2307 | ||
b0b667cb | 2308 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2309 | return ret; |
03699b14 | 2310 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2311 | { |
2312 | args[0] = val; | |
2313 | return Ffuncall (nargs, args); | |
2314 | } | |
2315 | else | |
2316 | { | |
fada05d6 KH |
2317 | globals = Qnil; |
2318 | GCPRO3 (sym, val, globals); | |
cb9d21f8 | 2319 | |
ff936e53 SM |
2320 | for (; |
2321 | CONSP (val) && ((cond == to_completion) | |
2322 | || (cond == until_success ? NILP (ret) | |
2323 | : !NILP (ret))); | |
03699b14 | 2324 | val = XCDR (val)) |
b0b667cb | 2325 | { |
03699b14 | 2326 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2327 | { |
2328 | /* t indicates this hook has a local binding; | |
2329 | it means to run the global binding too. */ | |
b0b667cb | 2330 | |
ff936e53 SM |
2331 | for (globals = Fdefault_value (sym); |
2332 | CONSP (globals) && ((cond == to_completion) | |
2333 | || (cond == until_success ? NILP (ret) | |
2334 | : !NILP (ret))); | |
03699b14 | 2335 | globals = XCDR (globals)) |
b0b667cb | 2336 | { |
03699b14 | 2337 | args[0] = XCAR (globals); |
77d92e05 RS |
2338 | /* In a global value, t should not occur. If it does, we |
2339 | must ignore it to avoid an endless loop. */ | |
2340 | if (!EQ (args[0], Qt)) | |
2341 | ret = Ffuncall (nargs, args); | |
b0b667cb KH |
2342 | } |
2343 | } | |
2344 | else | |
2345 | { | |
03699b14 | 2346 | args[0] = XCAR (val); |
ff936e53 | 2347 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2348 | } |
2349 | } | |
cb9d21f8 RS |
2350 | |
2351 | UNGCPRO; | |
ff936e53 | 2352 | return ret; |
b0b667cb KH |
2353 | } |
2354 | } | |
c933ea05 RS |
2355 | |
2356 | /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual | |
2357 | present value of that symbol. | |
2358 | Call each element of FUNLIST, | |
2359 | passing each of them the rest of ARGS. | |
2360 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2361 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2362 | ||
2363 | Lisp_Object | |
2364 | run_hook_list_with_args (funlist, nargs, args) | |
2365 | Lisp_Object funlist; | |
2366 | int nargs; | |
2367 | Lisp_Object *args; | |
2368 | { | |
2369 | Lisp_Object sym; | |
2370 | Lisp_Object val; | |
fada05d6 KH |
2371 | Lisp_Object globals; |
2372 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c933ea05 RS |
2373 | |
2374 | sym = args[0]; | |
fada05d6 KH |
2375 | globals = Qnil; |
2376 | GCPRO3 (sym, val, globals); | |
c933ea05 | 2377 | |
03699b14 | 2378 | for (val = funlist; CONSP (val); val = XCDR (val)) |
c933ea05 | 2379 | { |
03699b14 | 2380 | if (EQ (XCAR (val), Qt)) |
c933ea05 RS |
2381 | { |
2382 | /* t indicates this hook has a local binding; | |
2383 | it means to run the global binding too. */ | |
c933ea05 RS |
2384 | |
2385 | for (globals = Fdefault_value (sym); | |
2386 | CONSP (globals); | |
03699b14 | 2387 | globals = XCDR (globals)) |
c933ea05 | 2388 | { |
03699b14 | 2389 | args[0] = XCAR (globals); |
77d92e05 RS |
2390 | /* In a global value, t should not occur. If it does, we |
2391 | must ignore it to avoid an endless loop. */ | |
2392 | if (!EQ (args[0], Qt)) | |
2393 | Ffuncall (nargs, args); | |
c933ea05 RS |
2394 | } |
2395 | } | |
2396 | else | |
2397 | { | |
03699b14 | 2398 | args[0] = XCAR (val); |
c933ea05 RS |
2399 | Ffuncall (nargs, args); |
2400 | } | |
2401 | } | |
2402 | UNGCPRO; | |
2403 | return Qnil; | |
2404 | } | |
7d48558f RS |
2405 | |
2406 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ | |
2407 | ||
2408 | void | |
2409 | run_hook_with_args_2 (hook, arg1, arg2) | |
2410 | Lisp_Object hook, arg1, arg2; | |
2411 | { | |
2412 | Lisp_Object temp[3]; | |
2413 | temp[0] = hook; | |
2414 | temp[1] = arg1; | |
2415 | temp[2] = arg2; | |
2416 | ||
2417 | Frun_hook_with_args (3, temp); | |
2418 | } | |
ff936e53 | 2419 | \f |
db9f0278 JB |
2420 | /* Apply fn to arg */ |
2421 | Lisp_Object | |
2422 | apply1 (fn, arg) | |
2423 | Lisp_Object fn, arg; | |
2424 | { | |
a6e3fa71 JB |
2425 | struct gcpro gcpro1; |
2426 | ||
2427 | GCPRO1 (fn); | |
265a9e55 | 2428 | if (NILP (arg)) |
a6e3fa71 JB |
2429 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2430 | gcpro1.nvars = 2; | |
db9f0278 JB |
2431 | #ifdef NO_ARG_ARRAY |
2432 | { | |
2433 | Lisp_Object args[2]; | |
2434 | args[0] = fn; | |
2435 | args[1] = arg; | |
a6e3fa71 JB |
2436 | gcpro1.var = args; |
2437 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 JB |
2438 | } |
2439 | #else /* not NO_ARG_ARRAY */ | |
a6e3fa71 | 2440 | RETURN_UNGCPRO (Fapply (2, &fn)); |
db9f0278 JB |
2441 | #endif /* not NO_ARG_ARRAY */ |
2442 | } | |
2443 | ||
2444 | /* Call function fn on no arguments */ | |
2445 | Lisp_Object | |
2446 | call0 (fn) | |
2447 | Lisp_Object fn; | |
2448 | { | |
a6e3fa71 JB |
2449 | struct gcpro gcpro1; |
2450 | ||
2451 | GCPRO1 (fn); | |
2452 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2453 | } |
2454 | ||
15285f9f | 2455 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2456 | /* ARGSUSED */ |
2457 | Lisp_Object | |
15285f9f RS |
2458 | call1 (fn, arg1) |
2459 | Lisp_Object fn, arg1; | |
db9f0278 | 2460 | { |
a6e3fa71 | 2461 | struct gcpro gcpro1; |
db9f0278 | 2462 | #ifdef NO_ARG_ARRAY |
a6e3fa71 JB |
2463 | Lisp_Object args[2]; |
2464 | ||
db9f0278 | 2465 | args[0] = fn; |
15285f9f | 2466 | args[1] = arg1; |
a6e3fa71 JB |
2467 | GCPRO1 (args[0]); |
2468 | gcpro1.nvars = 2; | |
2469 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 | 2470 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2471 | GCPRO1 (fn); |
2472 | gcpro1.nvars = 2; | |
2473 | RETURN_UNGCPRO (Ffuncall (2, &fn)); | |
db9f0278 JB |
2474 | #endif /* not NO_ARG_ARRAY */ |
2475 | } | |
2476 | ||
15285f9f | 2477 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2478 | /* ARGSUSED */ |
2479 | Lisp_Object | |
15285f9f RS |
2480 | call2 (fn, arg1, arg2) |
2481 | Lisp_Object fn, arg1, arg2; | |
db9f0278 | 2482 | { |
a6e3fa71 | 2483 | struct gcpro gcpro1; |
db9f0278 JB |
2484 | #ifdef NO_ARG_ARRAY |
2485 | Lisp_Object args[3]; | |
2486 | args[0] = fn; | |
15285f9f RS |
2487 | args[1] = arg1; |
2488 | args[2] = arg2; | |
a6e3fa71 JB |
2489 | GCPRO1 (args[0]); |
2490 | gcpro1.nvars = 3; | |
2491 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 | 2492 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2493 | GCPRO1 (fn); |
2494 | gcpro1.nvars = 3; | |
2495 | RETURN_UNGCPRO (Ffuncall (3, &fn)); | |
db9f0278 JB |
2496 | #endif /* not NO_ARG_ARRAY */ |
2497 | } | |
2498 | ||
15285f9f | 2499 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2500 | /* ARGSUSED */ |
2501 | Lisp_Object | |
15285f9f RS |
2502 | call3 (fn, arg1, arg2, arg3) |
2503 | Lisp_Object fn, arg1, arg2, arg3; | |
db9f0278 | 2504 | { |
a6e3fa71 | 2505 | struct gcpro gcpro1; |
db9f0278 JB |
2506 | #ifdef NO_ARG_ARRAY |
2507 | Lisp_Object args[4]; | |
2508 | args[0] = fn; | |
15285f9f RS |
2509 | args[1] = arg1; |
2510 | args[2] = arg2; | |
2511 | args[3] = arg3; | |
a6e3fa71 JB |
2512 | GCPRO1 (args[0]); |
2513 | gcpro1.nvars = 4; | |
2514 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 | 2515 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2516 | GCPRO1 (fn); |
2517 | gcpro1.nvars = 4; | |
2518 | RETURN_UNGCPRO (Ffuncall (4, &fn)); | |
db9f0278 JB |
2519 | #endif /* not NO_ARG_ARRAY */ |
2520 | } | |
2521 | ||
15285f9f | 2522 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2523 | /* ARGSUSED */ |
2524 | Lisp_Object | |
15285f9f RS |
2525 | call4 (fn, arg1, arg2, arg3, arg4) |
2526 | Lisp_Object fn, arg1, arg2, arg3, arg4; | |
a5a44b91 JB |
2527 | { |
2528 | struct gcpro gcpro1; | |
2529 | #ifdef NO_ARG_ARRAY | |
2530 | Lisp_Object args[5]; | |
2531 | args[0] = fn; | |
15285f9f RS |
2532 | args[1] = arg1; |
2533 | args[2] = arg2; | |
2534 | args[3] = arg3; | |
2535 | args[4] = arg4; | |
a5a44b91 JB |
2536 | GCPRO1 (args[0]); |
2537 | gcpro1.nvars = 5; | |
2538 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
2539 | #else /* not NO_ARG_ARRAY */ | |
2540 | GCPRO1 (fn); | |
2541 | gcpro1.nvars = 5; | |
2542 | RETURN_UNGCPRO (Ffuncall (5, &fn)); | |
2543 | #endif /* not NO_ARG_ARRAY */ | |
2544 | } | |
2545 | ||
15285f9f RS |
2546 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2547 | /* ARGSUSED */ | |
2548 | Lisp_Object | |
2549 | call5 (fn, arg1, arg2, arg3, arg4, arg5) | |
2550 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5; | |
2551 | { | |
2552 | struct gcpro gcpro1; | |
2553 | #ifdef NO_ARG_ARRAY | |
2554 | Lisp_Object args[6]; | |
2555 | args[0] = fn; | |
2556 | args[1] = arg1; | |
2557 | args[2] = arg2; | |
2558 | args[3] = arg3; | |
2559 | args[4] = arg4; | |
2560 | args[5] = arg5; | |
2561 | GCPRO1 (args[0]); | |
2562 | gcpro1.nvars = 6; | |
2563 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
2564 | #else /* not NO_ARG_ARRAY */ | |
2565 | GCPRO1 (fn); | |
2566 | gcpro1.nvars = 6; | |
2567 | RETURN_UNGCPRO (Ffuncall (6, &fn)); | |
2568 | #endif /* not NO_ARG_ARRAY */ | |
2569 | } | |
2570 | ||
2571 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2572 | /* ARGSUSED */ | |
2573 | Lisp_Object | |
2574 | call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6) | |
2575 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6; | |
2576 | { | |
2577 | struct gcpro gcpro1; | |
2578 | #ifdef NO_ARG_ARRAY | |
2579 | Lisp_Object args[7]; | |
2580 | args[0] = fn; | |
2581 | args[1] = arg1; | |
2582 | args[2] = arg2; | |
2583 | args[3] = arg3; | |
2584 | args[4] = arg4; | |
2585 | args[5] = arg5; | |
2586 | args[6] = arg6; | |
2587 | GCPRO1 (args[0]); | |
2588 | gcpro1.nvars = 7; | |
2589 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
2590 | #else /* not NO_ARG_ARRAY */ | |
2591 | GCPRO1 (fn); | |
2592 | gcpro1.nvars = 7; | |
2593 | RETURN_UNGCPRO (Ffuncall (7, &fn)); | |
2594 | #endif /* not NO_ARG_ARRAY */ | |
2595 | } | |
2596 | ||
db9f0278 | 2597 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2598 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2599 | Return the value that function returns. | |
2600 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2601 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
2602 | (nargs, args) | |
db9f0278 JB |
2603 | int nargs; |
2604 | Lisp_Object *args; | |
2605 | { | |
2606 | Lisp_Object fun; | |
2607 | Lisp_Object funcar; | |
2608 | int numargs = nargs - 1; | |
2609 | Lisp_Object lisp_numargs; | |
2610 | Lisp_Object val; | |
2611 | struct backtrace backtrace; | |
2612 | register Lisp_Object *internal_args; | |
2613 | register int i; | |
2614 | ||
2615 | QUIT; | |
2616 | if (consing_since_gc > gc_cons_threshold) | |
a6e3fa71 | 2617 | Fgarbage_collect (); |
db9f0278 JB |
2618 | |
2619 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2620 | { | |
2621 | if (max_lisp_eval_depth < 100) | |
2622 | max_lisp_eval_depth = 100; | |
2623 | if (lisp_eval_depth > max_lisp_eval_depth) | |
2624 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
2625 | } | |
2626 | ||
2627 | backtrace.next = backtrace_list; | |
2628 | backtrace_list = &backtrace; | |
2629 | backtrace.function = &args[0]; | |
2630 | backtrace.args = &args[1]; | |
2631 | backtrace.nargs = nargs - 1; | |
2632 | backtrace.evalargs = 0; | |
2633 | backtrace.debug_on_exit = 0; | |
2634 | ||
2635 | if (debug_on_next_call) | |
2636 | do_debug_on_call (Qlambda); | |
2637 | ||
2638 | retry: | |
2639 | ||
2640 | fun = args[0]; | |
ffd56f97 JB |
2641 | |
2642 | fun = Findirect_function (fun); | |
db9f0278 | 2643 | |
90165123 | 2644 | if (SUBRP (fun)) |
db9f0278 JB |
2645 | { |
2646 | if (numargs < XSUBR (fun)->min_args | |
2647 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2648 | { | |
a631e24c | 2649 | XSETFASTINT (lisp_numargs, numargs); |
db9f0278 JB |
2650 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (lisp_numargs, Qnil))); |
2651 | } | |
2652 | ||
2653 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2654 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2655 | ||
2656 | if (XSUBR (fun)->max_args == MANY) | |
2657 | { | |
2658 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
2659 | goto done; | |
2660 | } | |
2661 | ||
2662 | if (XSUBR (fun)->max_args > numargs) | |
2663 | { | |
2664 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
2665 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
2666 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
2667 | internal_args[i] = Qnil; | |
2668 | } | |
2669 | else | |
2670 | internal_args = args + 1; | |
2671 | switch (XSUBR (fun)->max_args) | |
2672 | { | |
2673 | case 0: | |
2674 | val = (*XSUBR (fun)->function) (); | |
2675 | goto done; | |
2676 | case 1: | |
2677 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
2678 | goto done; | |
2679 | case 2: | |
2680 | val = (*XSUBR (fun)->function) (internal_args[0], | |
2681 | internal_args[1]); | |
2682 | goto done; | |
2683 | case 3: | |
2684 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2685 | internal_args[2]); | |
2686 | goto done; | |
2687 | case 4: | |
2688 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2689 | internal_args[2], | |
2690 | internal_args[3]); | |
2691 | goto done; | |
2692 | case 5: | |
2693 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2694 | internal_args[2], internal_args[3], | |
2695 | internal_args[4]); | |
2696 | goto done; | |
2697 | case 6: | |
2698 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2699 | internal_args[2], internal_args[3], | |
2700 | internal_args[4], internal_args[5]); | |
2701 | goto done; | |
15c65264 RS |
2702 | case 7: |
2703 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2704 | internal_args[2], internal_args[3], | |
2705 | internal_args[4], internal_args[5], | |
2706 | internal_args[6]); | |
2707 | goto done; | |
db9f0278 | 2708 | |
166c822d KH |
2709 | case 8: |
2710 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2711 | internal_args[2], internal_args[3], | |
2712 | internal_args[4], internal_args[5], | |
2713 | internal_args[6], internal_args[7]); | |
2714 | goto done; | |
2715 | ||
db9f0278 | 2716 | default: |
70ee42f7 | 2717 | |
166c822d | 2718 | /* If a subr takes more than 8 arguments without using MANY |
70ee42f7 JB |
2719 | or UNEVALLED, we need to extend this function to support it. |
2720 | Until this is done, there is no way to call the function. */ | |
2721 | abort (); | |
db9f0278 JB |
2722 | } |
2723 | } | |
90165123 | 2724 | if (COMPILEDP (fun)) |
db9f0278 JB |
2725 | val = funcall_lambda (fun, numargs, args + 1); |
2726 | else | |
2727 | { | |
2728 | if (!CONSP (fun)) | |
2729 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2730 | funcar = Fcar (fun); | |
90165123 | 2731 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
2732 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
2733 | if (EQ (funcar, Qlambda)) | |
2734 | val = funcall_lambda (fun, numargs, args + 1); | |
db9f0278 JB |
2735 | else if (EQ (funcar, Qautoload)) |
2736 | { | |
2737 | do_autoload (fun, args[0]); | |
2738 | goto retry; | |
2739 | } | |
2740 | else | |
2741 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2742 | } | |
2743 | done: | |
2744 | lisp_eval_depth--; | |
2745 | if (backtrace.debug_on_exit) | |
2746 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2747 | backtrace_list = backtrace.next; | |
2748 | return val; | |
2749 | } | |
2750 | \f | |
2751 | Lisp_Object | |
2752 | apply_lambda (fun, args, eval_flag) | |
2753 | Lisp_Object fun, args; | |
2754 | int eval_flag; | |
2755 | { | |
2756 | Lisp_Object args_left; | |
2757 | Lisp_Object numargs; | |
2758 | register Lisp_Object *arg_vector; | |
2759 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2760 | register int i; | |
2761 | register Lisp_Object tem; | |
2762 | ||
2763 | numargs = Flength (args); | |
2764 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
2765 | args_left = args; | |
2766 | ||
2767 | GCPRO3 (*arg_vector, args_left, fun); | |
2768 | gcpro1.nvars = 0; | |
2769 | ||
2770 | for (i = 0; i < XINT (numargs);) | |
2771 | { | |
2772 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
2773 | if (eval_flag) tem = Feval (tem); | |
2774 | arg_vector[i++] = tem; | |
2775 | gcpro1.nvars = i; | |
2776 | } | |
2777 | ||
2778 | UNGCPRO; | |
2779 | ||
2780 | if (eval_flag) | |
2781 | { | |
2782 | backtrace_list->args = arg_vector; | |
2783 | backtrace_list->nargs = i; | |
2784 | } | |
2785 | backtrace_list->evalargs = 0; | |
2786 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
2787 | ||
2788 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2789 | if (backtrace_list->debug_on_exit) | |
2790 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
2791 | /* Don't do it again when we return to eval. */ | |
2792 | backtrace_list->debug_on_exit = 0; | |
2793 | return tem; | |
2794 | } | |
2795 | ||
2796 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2797 | and return the result of evaluation. | |
2798 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2799 | ||
2901f1d1 | 2800 | static Lisp_Object |
db9f0278 JB |
2801 | funcall_lambda (fun, nargs, arg_vector) |
2802 | Lisp_Object fun; | |
2803 | int nargs; | |
2804 | register Lisp_Object *arg_vector; | |
2805 | { | |
9ab90667 | 2806 | Lisp_Object val, syms_left, next; |
db9f0278 | 2807 | int count = specpdl_ptr - specpdl; |
9ab90667 | 2808 | int i, optional, rest; |
db9f0278 | 2809 | |
90165123 | 2810 | if (CONSP (fun)) |
9ab90667 GM |
2811 | { |
2812 | syms_left = XCDR (fun); | |
2813 | if (CONSP (syms_left)) | |
2814 | syms_left = XCAR (syms_left); | |
2815 | else | |
2816 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2817 | } | |
90165123 | 2818 | else if (COMPILEDP (fun)) |
845975f5 | 2819 | syms_left = AREF (fun, COMPILED_ARGLIST); |
9ab90667 GM |
2820 | else |
2821 | abort (); | |
db9f0278 | 2822 | |
9ab90667 GM |
2823 | i = optional = rest = 0; |
2824 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
2825 | { |
2826 | QUIT; | |
9ab90667 GM |
2827 | |
2828 | next = XCAR (syms_left); | |
90165123 | 2829 | while (!SYMBOLP (next)) |
9ffa21d4 | 2830 | next = Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
9ab90667 | 2831 | |
db9f0278 JB |
2832 | if (EQ (next, Qand_rest)) |
2833 | rest = 1; | |
2834 | else if (EQ (next, Qand_optional)) | |
2835 | optional = 1; | |
2836 | else if (rest) | |
2837 | { | |
9ffa21d4 | 2838 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
2839 | i = nargs; |
2840 | } | |
2841 | else if (i < nargs) | |
9ab90667 | 2842 | specbind (next, arg_vector[i++]); |
db9f0278 | 2843 | else if (!optional) |
9ab90667 GM |
2844 | return Fsignal (Qwrong_number_of_arguments, |
2845 | Fcons (fun, Fcons (make_number (nargs), Qnil))); | |
db9f0278 JB |
2846 | else |
2847 | specbind (next, Qnil); | |
2848 | } | |
2849 | ||
9ab90667 GM |
2850 | if (!NILP (syms_left)) |
2851 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2852 | else if (i < nargs) | |
2853 | return Fsignal (Qwrong_number_of_arguments, | |
2854 | Fcons (fun, Fcons (make_number (nargs), Qnil))); | |
db9f0278 | 2855 | |
90165123 | 2856 | if (CONSP (fun)) |
9ab90667 | 2857 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 2858 | else |
ca248607 RS |
2859 | { |
2860 | /* If we have not actually read the bytecode string | |
2861 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 2862 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 2863 | Ffetch_bytecode (fun); |
845975f5 SM |
2864 | val = Fbyte_code (AREF (fun, COMPILED_BYTECODE), |
2865 | AREF (fun, COMPILED_CONSTANTS), | |
2866 | AREF (fun, COMPILED_STACK_DEPTH)); | |
ca248607 | 2867 | } |
9ab90667 | 2868 | |
db9f0278 JB |
2869 | return unbind_to (count, val); |
2870 | } | |
661c7d6e KH |
2871 | |
2872 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
2873 | 1, 1, 0, |
2874 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
2875 | (object) | |
661c7d6e KH |
2876 | Lisp_Object object; |
2877 | { | |
2878 | Lisp_Object tem; | |
2879 | ||
845975f5 | 2880 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 2881 | { |
845975f5 | 2882 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 2883 | if (!CONSP (tem)) |
845975f5 SM |
2884 | { |
2885 | tem = AREF (object, COMPILED_BYTECODE); | |
2886 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
2887 | error ("Invalid byte code in %s", XSTRING (XCAR (tem))->data); | |
2888 | else | |
2889 | error ("Invalid byte code"); | |
2890 | } | |
2891 | AREF (object, COMPILED_BYTECODE) = XCAR (tem); | |
2892 | AREF (object, COMPILED_CONSTANTS) = XCDR (tem); | |
661c7d6e KH |
2893 | } |
2894 | return object; | |
2895 | } | |
db9f0278 JB |
2896 | \f |
2897 | void | |
2898 | grow_specpdl () | |
2899 | { | |
2900 | register int count = specpdl_ptr - specpdl; | |
2901 | if (specpdl_size >= max_specpdl_size) | |
2902 | { | |
2903 | if (max_specpdl_size < 400) | |
2904 | max_specpdl_size = 400; | |
2905 | if (specpdl_size >= max_specpdl_size) | |
2906 | { | |
debee8fe RS |
2907 | if (!NILP (Vdebug_on_error)) |
2908 | /* Leave room for some specpdl in the debugger. */ | |
2909 | max_specpdl_size = specpdl_size + 100; | |
db9f0278 JB |
2910 | Fsignal (Qerror, |
2911 | Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil)); | |
db9f0278 JB |
2912 | } |
2913 | } | |
2914 | specpdl_size *= 2; | |
2915 | if (specpdl_size > max_specpdl_size) | |
2916 | specpdl_size = max_specpdl_size; | |
2917 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
2918 | specpdl_ptr = specpdl + count; | |
2919 | } | |
2920 | ||
2921 | void | |
2922 | specbind (symbol, value) | |
2923 | Lisp_Object symbol, value; | |
2924 | { | |
db9f0278 | 2925 | Lisp_Object ovalue; |
19cebf5a | 2926 | Lisp_Object valcontents; |
db9f0278 | 2927 | |
b7826503 | 2928 | CHECK_SYMBOL (symbol); |
db9f0278 JB |
2929 | if (specpdl_ptr == specpdl + specpdl_size) |
2930 | grow_specpdl (); | |
719177b3 | 2931 | |
19cebf5a GM |
2932 | /* The most common case is that of a non-constant symbol with a |
2933 | trivial value. Make that as fast as we can. */ | |
2934 | valcontents = SYMBOL_VALUE (symbol); | |
2935 | if (!MISCP (valcontents) && !SYMBOL_CONSTANT_P (symbol)) | |
719177b3 | 2936 | { |
9ab90667 | 2937 | specpdl_ptr->symbol = symbol; |
19cebf5a | 2938 | specpdl_ptr->old_value = valcontents; |
9ab90667 GM |
2939 | specpdl_ptr->func = NULL; |
2940 | ++specpdl_ptr; | |
19cebf5a | 2941 | SET_SYMBOL_VALUE (symbol, value); |
719177b3 RS |
2942 | } |
2943 | else | |
9ab90667 | 2944 | { |
eb700b82 GM |
2945 | Lisp_Object valcontents; |
2946 | ||
9ab90667 GM |
2947 | ovalue = find_symbol_value (symbol); |
2948 | specpdl_ptr->func = 0; | |
2949 | specpdl_ptr->old_value = ovalue; | |
719177b3 | 2950 | |
eb700b82 GM |
2951 | valcontents = XSYMBOL (symbol)->value; |
2952 | ||
2953 | if (BUFFER_LOCAL_VALUEP (valcontents) | |
2954 | || SOME_BUFFER_LOCAL_VALUEP (valcontents) | |
2955 | || BUFFER_OBJFWDP (valcontents)) | |
9ab90667 | 2956 | { |
0967b4b0 GM |
2957 | Lisp_Object where, current_buffer; |
2958 | ||
2959 | current_buffer = Fcurrent_buffer (); | |
06bccf8e | 2960 | |
9ab90667 | 2961 | /* For a local variable, record both the symbol and which |
eb700b82 GM |
2962 | buffer's or frame's value we are saving. */ |
2963 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
0967b4b0 | 2964 | where = current_buffer; |
eb700b82 GM |
2965 | else if (!BUFFER_OBJFWDP (valcontents) |
2966 | && XBUFFER_LOCAL_VALUE (valcontents)->found_for_frame) | |
2967 | where = XBUFFER_LOCAL_VALUE (valcontents)->frame; | |
2968 | else | |
2969 | where = Qnil; | |
2970 | ||
2971 | /* We're not using the `unused' slot in the specbinding | |
2972 | structure because this would mean we have to do more | |
2973 | work for simple variables. */ | |
0967b4b0 | 2974 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, current_buffer)); |
06bccf8e GM |
2975 | |
2976 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
2977 | buffer-local value here, make the `let' change the global | |
2978 | value by changing the value of SYMBOL in all buffers not | |
2979 | having their own value. This is consistent with what | |
2980 | happens with other buffer-local variables. */ | |
eb700b82 GM |
2981 | if (NILP (where) |
2982 | && BUFFER_OBJFWDP (valcontents)) | |
06bccf8e GM |
2983 | { |
2984 | ++specpdl_ptr; | |
2985 | Fset_default (symbol, value); | |
2986 | return; | |
2987 | } | |
9ab90667 GM |
2988 | } |
2989 | else | |
2990 | specpdl_ptr->symbol = symbol; | |
2991 | ||
2992 | specpdl_ptr++; | |
2993 | if (BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue)) | |
eae0e123 | 2994 | store_symval_forwarding (symbol, ovalue, value, NULL); |
9ab90667 GM |
2995 | else |
2996 | set_internal (symbol, value, 0, 1); | |
2997 | } | |
db9f0278 JB |
2998 | } |
2999 | ||
3000 | void | |
3001 | record_unwind_protect (function, arg) | |
1d159538 | 3002 | Lisp_Object (*function) P_ ((Lisp_Object)); |
db9f0278 JB |
3003 | Lisp_Object arg; |
3004 | { | |
3005 | if (specpdl_ptr == specpdl + specpdl_size) | |
3006 | grow_specpdl (); | |
3007 | specpdl_ptr->func = function; | |
3008 | specpdl_ptr->symbol = Qnil; | |
3009 | specpdl_ptr->old_value = arg; | |
3010 | specpdl_ptr++; | |
3011 | } | |
3012 | ||
3013 | Lisp_Object | |
3014 | unbind_to (count, value) | |
3015 | int count; | |
3016 | Lisp_Object value; | |
3017 | { | |
265a9e55 | 3018 | int quitf = !NILP (Vquit_flag); |
db9f0278 JB |
3019 | struct gcpro gcpro1; |
3020 | ||
3021 | GCPRO1 (value); | |
db9f0278 JB |
3022 | Vquit_flag = Qnil; |
3023 | ||
3024 | while (specpdl_ptr != specpdl + count) | |
3025 | { | |
3026 | --specpdl_ptr; | |
eb700b82 | 3027 | |
db9f0278 JB |
3028 | if (specpdl_ptr->func != 0) |
3029 | (*specpdl_ptr->func) (specpdl_ptr->old_value); | |
3030 | /* Note that a "binding" of nil is really an unwind protect, | |
719177b3 | 3031 | so in that case the "old value" is a list of forms to evaluate. */ |
265a9e55 | 3032 | else if (NILP (specpdl_ptr->symbol)) |
db9f0278 | 3033 | Fprogn (specpdl_ptr->old_value); |
0967b4b0 GM |
3034 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3035 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3036 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3037 | bound a variable that had a buffer-local or frame-local |
3038 | binding. WHERE nil means that the variable had the default | |
0967b4b0 GM |
3039 | value when it was bound. CURRENT-BUFFER is the buffer that |
3040 | was current when the variable was bound. */ | |
719177b3 RS |
3041 | else if (CONSP (specpdl_ptr->symbol)) |
3042 | { | |
eb700b82 | 3043 | Lisp_Object symbol, where; |
719177b3 RS |
3044 | |
3045 | symbol = XCAR (specpdl_ptr->symbol); | |
0967b4b0 | 3046 | where = XCAR (XCDR (specpdl_ptr->symbol)); |
719177b3 | 3047 | |
eb700b82 | 3048 | if (NILP (where)) |
719177b3 | 3049 | Fset_default (symbol, specpdl_ptr->old_value); |
eb700b82 GM |
3050 | else if (BUFFERP (where)) |
3051 | set_internal (symbol, specpdl_ptr->old_value, XBUFFER (where), 1); | |
3052 | else | |
3053 | set_internal (symbol, specpdl_ptr->old_value, NULL, 1); | |
719177b3 | 3054 | } |
db9f0278 | 3055 | else |
9ab90667 GM |
3056 | { |
3057 | /* If variable has a trivial value (no forwarding), we can | |
3058 | just set it. No need to check for constant symbols here, | |
3059 | since that was already done by specbind. */ | |
19cebf5a GM |
3060 | if (!MISCP (SYMBOL_VALUE (specpdl_ptr->symbol))) |
3061 | SET_SYMBOL_VALUE (specpdl_ptr->symbol, specpdl_ptr->old_value); | |
9ab90667 GM |
3062 | else |
3063 | set_internal (specpdl_ptr->symbol, specpdl_ptr->old_value, 0, 1); | |
3064 | } | |
db9f0278 | 3065 | } |
9ab90667 GM |
3066 | |
3067 | if (NILP (Vquit_flag) && quitf) | |
3068 | Vquit_flag = Qt; | |
db9f0278 JB |
3069 | |
3070 | UNGCPRO; | |
db9f0278 JB |
3071 | return value; |
3072 | } | |
3073 | \f | |
db9f0278 | 3074 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3075 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3076 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
3077 | (level, flag) | |
db9f0278 JB |
3078 | Lisp_Object level, flag; |
3079 | { | |
3080 | register struct backtrace *backlist = backtrace_list; | |
3081 | register int i; | |
3082 | ||
b7826503 | 3083 | CHECK_NUMBER (level); |
db9f0278 JB |
3084 | |
3085 | for (i = 0; backlist && i < XINT (level); i++) | |
3086 | { | |
3087 | backlist = backlist->next; | |
3088 | } | |
3089 | ||
3090 | if (backlist) | |
265a9e55 | 3091 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3092 | |
3093 | return flag; | |
3094 | } | |
3095 | ||
3096 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3097 | doc: /* Print a trace of Lisp function calls currently active. |
3098 | Output stream used is value of `standard-output'. */) | |
3099 | () | |
db9f0278 JB |
3100 | { |
3101 | register struct backtrace *backlist = backtrace_list; | |
3102 | register int i; | |
3103 | Lisp_Object tail; | |
3104 | Lisp_Object tem; | |
3105 | extern Lisp_Object Vprint_level; | |
3106 | struct gcpro gcpro1; | |
3107 | ||
a631e24c | 3108 | XSETFASTINT (Vprint_level, 3); |
db9f0278 JB |
3109 | |
3110 | tail = Qnil; | |
3111 | GCPRO1 (tail); | |
3112 | ||
3113 | while (backlist) | |
3114 | { | |
3115 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
3116 | if (backlist->nargs == UNEVALLED) | |
3117 | { | |
3118 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3119 | write_string ("\n", -1); |
db9f0278 JB |
3120 | } |
3121 | else | |
3122 | { | |
3123 | tem = *backlist->function; | |
3124 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
3125 | write_string ("(", -1); | |
3126 | if (backlist->nargs == MANY) | |
3127 | { | |
3128 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 3129 | !NILP (tail); |
db9f0278 JB |
3130 | tail = Fcdr (tail), i++) |
3131 | { | |
3132 | if (i) write_string (" ", -1); | |
3133 | Fprin1 (Fcar (tail), Qnil); | |
3134 | } | |
3135 | } | |
3136 | else | |
3137 | { | |
3138 | for (i = 0; i < backlist->nargs; i++) | |
3139 | { | |
3140 | if (i) write_string (" ", -1); | |
3141 | Fprin1 (backlist->args[i], Qnil); | |
3142 | } | |
3143 | } | |
b6703b02 | 3144 | write_string (")\n", -1); |
db9f0278 | 3145 | } |
db9f0278 JB |
3146 | backlist = backlist->next; |
3147 | } | |
3148 | ||
3149 | Vprint_level = Qnil; | |
3150 | UNGCPRO; | |
3151 | return Qnil; | |
3152 | } | |
3153 | ||
17401c97 | 3154 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3155 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3156 | If that frame has not evaluated the arguments yet (or is a special form), | |
3157 | the value is (nil FUNCTION ARG-FORMS...). | |
3158 | If that frame has evaluated its arguments and called its function already, | |
3159 | the value is (t FUNCTION ARG-VALUES...). | |
3160 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3161 | FUNCTION is whatever was supplied as car of evaluated list, | |
3162 | or a lambda expression for macro calls. | |
3163 | If NFRAMES is more than the number of frames, the value is nil. */) | |
3164 | (nframes) | |
db9f0278 JB |
3165 | Lisp_Object nframes; |
3166 | { | |
3167 | register struct backtrace *backlist = backtrace_list; | |
3168 | register int i; | |
3169 | Lisp_Object tem; | |
3170 | ||
b7826503 | 3171 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3172 | |
3173 | /* Find the frame requested. */ | |
b6703b02 | 3174 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3175 | backlist = backlist->next; |
3176 | ||
3177 | if (!backlist) | |
3178 | return Qnil; | |
3179 | if (backlist->nargs == UNEVALLED) | |
3180 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
3181 | else | |
3182 | { | |
3183 | if (backlist->nargs == MANY) | |
3184 | tem = *backlist->args; | |
3185 | else | |
3186 | tem = Flist (backlist->nargs, backlist->args); | |
3187 | ||
3188 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3189 | } | |
3190 | } | |
a2ff3819 | 3191 | |
db9f0278 | 3192 | \f |
dfcf069d | 3193 | void |
db9f0278 JB |
3194 | syms_of_eval () |
3195 | { | |
3196 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
9dbc9081 PJ |
3197 | doc: /* *Limit on number of Lisp variable bindings & unwind-protects. |
3198 | If Lisp code tries to make more than this many at once, | |
3199 | an error is signaled. */); | |
db9f0278 JB |
3200 | |
3201 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
9dbc9081 PJ |
3202 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
3203 | This limit is to catch infinite recursions for you before they cause | |
3204 | actual stack overflow in C, which would be fatal for Emacs. | |
3205 | You can safely make it considerably larger than its default value, | |
3206 | if that proves inconveniently small. */); | |
db9f0278 JB |
3207 | |
3208 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
9dbc9081 PJ |
3209 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
3210 | Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'. */); | |
db9f0278 JB |
3211 | Vquit_flag = Qnil; |
3212 | ||
3213 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
9dbc9081 PJ |
3214 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3215 | Note that `quit-flag' will still be set by typing C-g, | |
3216 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3217 | To prevent this happening, set `quit-flag' to nil | |
3218 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3219 | Vinhibit_quit = Qnil; |
3220 | ||
ad236261 JB |
3221 | Qinhibit_quit = intern ("inhibit-quit"); |
3222 | staticpro (&Qinhibit_quit); | |
3223 | ||
db9f0278 JB |
3224 | Qautoload = intern ("autoload"); |
3225 | staticpro (&Qautoload); | |
3226 | ||
3227 | Qdebug_on_error = intern ("debug-on-error"); | |
3228 | staticpro (&Qdebug_on_error); | |
3229 | ||
3230 | Qmacro = intern ("macro"); | |
3231 | staticpro (&Qmacro); | |
3232 | ||
3233 | /* Note that the process handling also uses Qexit, but we don't want | |
3234 | to staticpro it twice, so we just do it here. */ | |
3235 | Qexit = intern ("exit"); | |
3236 | staticpro (&Qexit); | |
3237 | ||
3238 | Qinteractive = intern ("interactive"); | |
3239 | staticpro (&Qinteractive); | |
3240 | ||
3241 | Qcommandp = intern ("commandp"); | |
3242 | staticpro (&Qcommandp); | |
3243 | ||
3244 | Qdefun = intern ("defun"); | |
3245 | staticpro (&Qdefun); | |
3246 | ||
3247 | Qand_rest = intern ("&rest"); | |
3248 | staticpro (&Qand_rest); | |
3249 | ||
3250 | Qand_optional = intern ("&optional"); | |
3251 | staticpro (&Qand_optional); | |
3252 | ||
128c0f66 | 3253 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
704788b3 RS |
3254 | doc: /* *Non-nil means errors display a backtrace buffer. |
3255 | More precisely, this happens for any error that is handled | |
3256 | by the editor command loop. | |
9dbc9081 PJ |
3257 | If the value is a list, an error only means to display a backtrace |
3258 | if one of its condition symbols appears in the list. */); | |
128c0f66 | 3259 | Vstack_trace_on_error = Qnil; |
db9f0278 | 3260 | |
128c0f66 | 3261 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
9dbc9081 PJ |
3262 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3263 | Does not apply to errors handled by `condition-case' or those | |
3264 | matched by `debug-ignored-errors'. | |
3265 | If the value is a list, an error only means to enter the debugger | |
3266 | if one of its condition symbols appears in the list. | |
3267 | When you evaluate an expression interactively, this variable | |
3268 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
3269 | See also variable `debug-on-quit'. */); | |
128c0f66 | 3270 | Vdebug_on_error = Qnil; |
db9f0278 | 3271 | |
fc950e09 | 3272 | DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors, |
9dbc9081 PJ |
3273 | doc: /* *List of errors for which the debugger should not be called. |
3274 | Each element may be a condition-name or a regexp that matches error messages. | |
3275 | If any element applies to a given error, that error skips the debugger | |
3276 | and just returns to top level. | |
3277 | This overrides the variable `debug-on-error'. | |
3278 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3279 | Vdebug_ignored_errors = Qnil; |
3280 | ||
db9f0278 | 3281 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, |
9dbc9081 PJ |
3282 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3283 | Does not apply if quit is handled by a `condition-case'. | |
3284 | When you evaluate an expression interactively, this variable | |
3285 | is temporarily non-nil if `eval-expression-debug-on-quit' is non-nil. */); | |
db9f0278 JB |
3286 | debug_on_quit = 0; |
3287 | ||
3288 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
9dbc9081 | 3289 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3290 | |
556d7314 | 3291 | DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue, |
9dbc9081 PJ |
3292 | doc: /* Non-nil means debugger may continue execution. |
3293 | This is nil when the debugger is called under circumstances where it | |
3294 | might not be safe to continue. */); | |
dac204bc | 3295 | debugger_may_continue = 1; |
556d7314 | 3296 | |
db9f0278 | 3297 | DEFVAR_LISP ("debugger", &Vdebugger, |
9dbc9081 PJ |
3298 | doc: /* Function to call to invoke debugger. |
3299 | If due to frame exit, args are `exit' and the value being returned; | |
3300 | this function's value will be returned instead of that. | |
3301 | If due to error, args are `error' and a list of the args to `signal'. | |
3302 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3303 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3304 | Vdebugger = Qnil; |
3305 | ||
61ede770 | 3306 | DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function, |
9dbc9081 PJ |
3307 | doc: /* If non-nil, this is a function for `signal' to call. |
3308 | It receives the same arguments that `signal' was given. | |
3309 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3310 | Vsignal_hook_function = Qnil; |
3311 | ||
57a6e758 | 3312 | DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal, |
9dbc9081 PJ |
3313 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3314 | Note that `debug-on-error', `debug-on-quit' and friends | |
3315 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3316 | Vdebug_on_signal = Qnil; |
61ede770 | 3317 | |
6e6e9f08 RS |
3318 | Vrun_hooks = intern ("run-hooks"); |
3319 | staticpro (&Vrun_hooks); | |
db9f0278 JB |
3320 | |
3321 | staticpro (&Vautoload_queue); | |
3322 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3323 | staticpro (&Vsignaling_function); |
3324 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3325 | |
3326 | defsubr (&Sor); | |
3327 | defsubr (&Sand); | |
3328 | defsubr (&Sif); | |
3329 | defsubr (&Scond); | |
3330 | defsubr (&Sprogn); | |
3331 | defsubr (&Sprog1); | |
3332 | defsubr (&Sprog2); | |
3333 | defsubr (&Ssetq); | |
3334 | defsubr (&Squote); | |
3335 | defsubr (&Sfunction); | |
3336 | defsubr (&Sdefun); | |
3337 | defsubr (&Sdefmacro); | |
3338 | defsubr (&Sdefvar); | |
19cebf5a | 3339 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3340 | defsubr (&Sdefconst); |
3341 | defsubr (&Suser_variable_p); | |
3342 | defsubr (&Slet); | |
3343 | defsubr (&SletX); | |
3344 | defsubr (&Swhile); | |
3345 | defsubr (&Smacroexpand); | |
3346 | defsubr (&Scatch); | |
3347 | defsubr (&Sthrow); | |
3348 | defsubr (&Sunwind_protect); | |
3349 | defsubr (&Scondition_case); | |
3350 | defsubr (&Ssignal); | |
3351 | defsubr (&Sinteractive_p); | |
3352 | defsubr (&Scommandp); | |
3353 | defsubr (&Sautoload); | |
3354 | defsubr (&Seval); | |
3355 | defsubr (&Sapply); | |
3356 | defsubr (&Sfuncall); | |
ff936e53 SM |
3357 | defsubr (&Srun_hooks); |
3358 | defsubr (&Srun_hook_with_args); | |
3359 | defsubr (&Srun_hook_with_args_until_success); | |
3360 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 3361 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3362 | defsubr (&Sbacktrace_debug); |
3363 | defsubr (&Sbacktrace); | |
3364 | defsubr (&Sbacktrace_frame); | |
3365 | } |