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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
f4cfd81a | 2 | Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1999, 2000, 2001, |
e9bffc61 GM |
3 | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
4 | 2011 Free Software Foundation, Inc. | |
db9f0278 JB |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
9ec0b715 | 8 | GNU Emacs is free software: you can redistribute it and/or modify |
db9f0278 | 9 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
db9f0278 JB |
12 | |
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
db9f0278 JB |
20 | |
21 | ||
18160b98 | 22 | #include <config.h> |
d7306fe6 | 23 | #include <setjmp.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" |
94b612ad | 29 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 30 | |
b70e1a2b SM |
31 | #if HAVE_X_WINDOWS |
32 | #include "xterm.h" | |
33 | #endif | |
34 | ||
db9f0278 JB |
35 | /* This definition is duplicated in alloc.c and keyboard.c */ |
36 | /* Putting it in lisp.h makes cc bomb out! */ | |
37 | ||
38 | struct backtrace | |
4c576a83 GM |
39 | { |
40 | struct backtrace *next; | |
41 | Lisp_Object *function; | |
42 | Lisp_Object *args; /* Points to vector of args. */ | |
43 | int nargs; /* Length of vector. | |
daa37602 JB |
44 | If nargs is UNEVALLED, args points to slot holding |
45 | list of unevalled args */ | |
4c576a83 GM |
46 | char evalargs; |
47 | /* Nonzero means call value of debugger when done with this operation. */ | |
48 | char debug_on_exit; | |
49 | }; | |
db9f0278 JB |
50 | |
51 | struct backtrace *backtrace_list; | |
52 | ||
db9f0278 JB |
53 | struct catchtag *catchlist; |
54 | ||
15934ffa RS |
55 | #ifdef DEBUG_GCPRO |
56 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
57 | int gcpro_level; | |
58 | #endif | |
59 | ||
6fd797f5 | 60 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
29208e82 | 61 | Lisp_Object Qinhibit_quit; |
db9f0278 JB |
62 | Lisp_Object Qand_rest, Qand_optional; |
63 | Lisp_Object Qdebug_on_error; | |
d6edd563 | 64 | Lisp_Object Qdeclare; |
f01cbfdd | 65 | Lisp_Object Qdebug; |
db9f0278 | 66 | |
6e6e9f08 RS |
67 | /* This holds either the symbol `run-hooks' or nil. |
68 | It is nil at an early stage of startup, and when Emacs | |
69 | is shutting down. */ | |
4c576a83 | 70 | |
db9f0278 JB |
71 | Lisp_Object Vrun_hooks; |
72 | ||
73 | /* Non-nil means record all fset's and provide's, to be undone | |
74 | if the file being autoloaded is not fully loaded. | |
75 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 76 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
77 | |
78 | Lisp_Object Vautoload_queue; | |
79 | ||
80 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 81 | |
5816888b | 82 | EMACS_INT specpdl_size; |
db9f0278 JB |
83 | |
84 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 85 | |
db9f0278 JB |
86 | struct specbinding *specpdl; |
87 | ||
88 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 89 | |
ab837828 | 90 | struct specbinding *specpdl_ptr; |
db9f0278 | 91 | |
db9f0278 | 92 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 93 | |
5816888b | 94 | EMACS_INT lisp_eval_depth; |
db9f0278 | 95 | |
be857679 | 96 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 97 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 98 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
99 | know that the debugger itself has an error, and we should just |
100 | signal the error instead of entering an infinite loop of debugger | |
101 | invocations. */ | |
4c576a83 | 102 | |
82da7701 | 103 | int when_entered_debugger; |
db9f0278 | 104 | |
a2ff3819 GM |
105 | /* The function from which the last `signal' was called. Set in |
106 | Fsignal. */ | |
107 | ||
108 | Lisp_Object Vsignaling_function; | |
109 | ||
4c576a83 GM |
110 | /* Set to non-zero while processing X events. Checked in Feval to |
111 | make sure the Lisp interpreter isn't called from a signal handler, | |
112 | which is unsafe because the interpreter isn't reentrant. */ | |
113 | ||
114 | int handling_signal; | |
115 | ||
f57e2426 J |
116 | static Lisp_Object funcall_lambda (Lisp_Object, int, Lisp_Object*); |
117 | static void unwind_to_catch (struct catchtag *, Lisp_Object) NO_RETURN; | |
2f7c71a1 AS |
118 | static int interactive_p (int); |
119 | static Lisp_Object apply_lambda (Lisp_Object, Lisp_Object, int); | |
873759d5 | 120 | \f |
dfcf069d | 121 | void |
d3da34e0 | 122 | init_eval_once (void) |
db9f0278 JB |
123 | { |
124 | specpdl_size = 50; | |
716acfce | 125 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 126 | specpdl_ptr = specpdl; |
6588243d | 127 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
a4547405 | 128 | max_specpdl_size = 1000; |
d46f6bbb | 129 | max_lisp_eval_depth = 600; |
34d470ba RS |
130 | |
131 | Vrun_hooks = Qnil; | |
db9f0278 JB |
132 | } |
133 | ||
dfcf069d | 134 | void |
d3da34e0 | 135 | init_eval (void) |
db9f0278 JB |
136 | { |
137 | specpdl_ptr = specpdl; | |
138 | catchlist = 0; | |
139 | handlerlist = 0; | |
140 | backtrace_list = 0; | |
141 | Vquit_flag = Qnil; | |
142 | debug_on_next_call = 0; | |
143 | lisp_eval_depth = 0; | |
87e21fbd | 144 | #ifdef DEBUG_GCPRO |
15934ffa | 145 | gcpro_level = 0; |
87e21fbd | 146 | #endif |
be857679 | 147 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 148 | when_entered_debugger = -1; |
db9f0278 JB |
149 | } |
150 | ||
9f5903bb RS |
151 | /* unwind-protect function used by call_debugger. */ |
152 | ||
153 | static Lisp_Object | |
d3da34e0 | 154 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
155 | { |
156 | max_specpdl_size = XINT (XCAR (data)); | |
157 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 158 | return Qnil; |
9f5903bb RS |
159 | } |
160 | ||
161 | /* Call the Lisp debugger, giving it argument ARG. */ | |
162 | ||
db9f0278 | 163 | Lisp_Object |
d3da34e0 | 164 | call_debugger (Lisp_Object arg) |
db9f0278 | 165 | { |
3648c842 | 166 | int debug_while_redisplaying; |
aed13378 | 167 | int count = SPECPDL_INDEX (); |
3648c842 | 168 | Lisp_Object val; |
5816888b | 169 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 170 | |
9f5903bb RS |
171 | /* Temporarily bump up the stack limits, |
172 | so the debugger won't run out of stack. */ | |
177c0ea7 | 173 | |
9f5903bb RS |
174 | max_specpdl_size += 1; |
175 | record_unwind_protect (restore_stack_limits, | |
176 | Fcons (make_number (old_max), | |
177 | make_number (max_lisp_eval_depth))); | |
178 | max_specpdl_size = old_max; | |
179 | ||
180 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
181 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
182 | ||
183 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
184 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 185 | |
d148e14d | 186 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
187 | if (display_hourglass_p) |
188 | cancel_hourglass (); | |
237c23b0 GM |
189 | #endif |
190 | ||
db9f0278 | 191 | debug_on_next_call = 0; |
be857679 | 192 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
193 | |
194 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
195 | displayed if the debugger is invoked during redisplay. */ | |
196 | debug_while_redisplaying = redisplaying_p; | |
197 | redisplaying_p = 0; | |
556d7314 GM |
198 | specbind (intern ("debugger-may-continue"), |
199 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 200 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 201 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
202 | |
203 | #if 0 /* Binding this prevents execution of Lisp code during | |
204 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 205 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 206 | #endif |
177c0ea7 | 207 | |
3648c842 GM |
208 | val = apply1 (Vdebugger, arg); |
209 | ||
210 | /* Interrupting redisplay and resuming it later is not safe under | |
211 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 212 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
213 | if (debug_while_redisplaying) |
214 | Ftop_level (); | |
215 | ||
556d7314 | 216 | return unbind_to (count, val); |
db9f0278 JB |
217 | } |
218 | ||
dfcf069d | 219 | void |
d3da34e0 | 220 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
221 | { |
222 | debug_on_next_call = 0; | |
223 | backtrace_list->debug_on_exit = 1; | |
224 | call_debugger (Fcons (code, Qnil)); | |
225 | } | |
226 | \f | |
227 | /* NOTE!!! Every function that can call EVAL must protect its args | |
228 | and temporaries from garbage collection while it needs them. | |
229 | The definition of `For' shows what you have to do. */ | |
230 | ||
231 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
232 | doc: /* Eval args until one of them yields non-nil, then return that value. |
233 | The remaining args are not evalled at all. | |
234 | If all args return nil, return nil. | |
533eb34b | 235 | usage: (or CONDITIONS...) */) |
5842a27b | 236 | (Lisp_Object args) |
db9f0278 | 237 | { |
e509f168 | 238 | register Lisp_Object val = Qnil; |
db9f0278 JB |
239 | struct gcpro gcpro1; |
240 | ||
e509f168 | 241 | GCPRO1 (args); |
db9f0278 | 242 | |
e509f168 | 243 | while (CONSP (args)) |
db9f0278 | 244 | { |
e509f168 | 245 | val = Feval (XCAR (args)); |
265a9e55 | 246 | if (!NILP (val)) |
db9f0278 | 247 | break; |
e509f168 | 248 | args = XCDR (args); |
db9f0278 | 249 | } |
db9f0278 JB |
250 | |
251 | UNGCPRO; | |
252 | return val; | |
253 | } | |
254 | ||
255 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 256 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
257 | The remaining args are not evalled at all. |
258 | If no arg yields nil, return the last arg's value. | |
533eb34b | 259 | usage: (and CONDITIONS...) */) |
5842a27b | 260 | (Lisp_Object args) |
db9f0278 | 261 | { |
e509f168 | 262 | register Lisp_Object val = Qt; |
db9f0278 JB |
263 | struct gcpro gcpro1; |
264 | ||
e509f168 | 265 | GCPRO1 (args); |
db9f0278 | 266 | |
e509f168 | 267 | while (CONSP (args)) |
db9f0278 | 268 | { |
e509f168 | 269 | val = Feval (XCAR (args)); |
265a9e55 | 270 | if (NILP (val)) |
db9f0278 | 271 | break; |
e509f168 | 272 | args = XCDR (args); |
db9f0278 | 273 | } |
db9f0278 JB |
274 | |
275 | UNGCPRO; | |
276 | return val; | |
277 | } | |
278 | ||
279 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 280 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
281 | Returns the value of THEN or the value of the last of the ELSE's. |
282 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
283 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 284 | usage: (if COND THEN ELSE...) */) |
5842a27b | 285 | (Lisp_Object args) |
db9f0278 JB |
286 | { |
287 | register Lisp_Object cond; | |
288 | struct gcpro gcpro1; | |
289 | ||
290 | GCPRO1 (args); | |
291 | cond = Feval (Fcar (args)); | |
292 | UNGCPRO; | |
293 | ||
265a9e55 | 294 | if (!NILP (cond)) |
db9f0278 JB |
295 | return Feval (Fcar (Fcdr (args))); |
296 | return Fprogn (Fcdr (Fcdr (args))); | |
297 | } | |
298 | ||
299 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
300 | doc: /* Try each clause until one succeeds. |
301 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
302 | and, if the value is non-nil, this clause succeeds: | |
303 | then the expressions in BODY are evaluated and the last one's | |
304 | value is the value of the cond-form. | |
305 | If no clause succeeds, cond returns nil. | |
306 | If a clause has one element, as in (CONDITION), | |
307 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 308 | usage: (cond CLAUSES...) */) |
5842a27b | 309 | (Lisp_Object args) |
db9f0278 JB |
310 | { |
311 | register Lisp_Object clause, val; | |
312 | struct gcpro gcpro1; | |
313 | ||
314 | val = Qnil; | |
315 | GCPRO1 (args); | |
265a9e55 | 316 | while (!NILP (args)) |
db9f0278 JB |
317 | { |
318 | clause = Fcar (args); | |
319 | val = Feval (Fcar (clause)); | |
265a9e55 | 320 | if (!NILP (val)) |
db9f0278 | 321 | { |
03699b14 KR |
322 | if (!EQ (XCDR (clause), Qnil)) |
323 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
324 | break; |
325 | } | |
03699b14 | 326 | args = XCDR (args); |
db9f0278 JB |
327 | } |
328 | UNGCPRO; | |
329 | ||
330 | return val; | |
331 | } | |
332 | ||
333 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
9dbc9081 | 334 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 335 | usage: (progn BODY...) */) |
5842a27b | 336 | (Lisp_Object args) |
db9f0278 | 337 | { |
e509f168 | 338 | register Lisp_Object val = Qnil; |
db9f0278 JB |
339 | struct gcpro gcpro1; |
340 | ||
e509f168 | 341 | GCPRO1 (args); |
db9f0278 | 342 | |
e509f168 | 343 | while (CONSP (args)) |
db9f0278 | 344 | { |
e509f168 SM |
345 | val = Feval (XCAR (args)); |
346 | args = XCDR (args); | |
db9f0278 | 347 | } |
db9f0278 JB |
348 | |
349 | UNGCPRO; | |
350 | return val; | |
351 | } | |
352 | ||
353 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 354 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
355 | The value of FIRST is saved during the evaluation of the remaining args, |
356 | whose values are discarded. | |
7a25dc6d | 357 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 358 | (Lisp_Object args) |
db9f0278 JB |
359 | { |
360 | Lisp_Object val; | |
361 | register Lisp_Object args_left; | |
362 | struct gcpro gcpro1, gcpro2; | |
363 | register int argnum = 0; | |
364 | ||
9ac66b45 | 365 | if (NILP (args)) |
db9f0278 JB |
366 | return Qnil; |
367 | ||
368 | args_left = args; | |
369 | val = Qnil; | |
370 | GCPRO2 (args, val); | |
371 | ||
372 | do | |
373 | { | |
374 | if (!(argnum++)) | |
bb8e180f | 375 | val = Feval (Fcar (args_left)); |
db9f0278 JB |
376 | else |
377 | Feval (Fcar (args_left)); | |
378 | args_left = Fcdr (args_left); | |
379 | } | |
265a9e55 | 380 | while (!NILP(args_left)); |
db9f0278 JB |
381 | |
382 | UNGCPRO; | |
383 | return val; | |
384 | } | |
385 | ||
386 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 387 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
388 | The value of FORM2 is saved during the evaluation of the |
389 | remaining args, whose values are discarded. | |
390 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 391 | (Lisp_Object args) |
db9f0278 JB |
392 | { |
393 | Lisp_Object val; | |
394 | register Lisp_Object args_left; | |
395 | struct gcpro gcpro1, gcpro2; | |
396 | register int argnum = -1; | |
397 | ||
398 | val = Qnil; | |
399 | ||
87d238ba | 400 | if (NILP (args)) |
db9f0278 JB |
401 | return Qnil; |
402 | ||
403 | args_left = args; | |
404 | val = Qnil; | |
405 | GCPRO2 (args, val); | |
406 | ||
407 | do | |
408 | { | |
409 | if (!(argnum++)) | |
bb8e180f | 410 | val = Feval (Fcar (args_left)); |
db9f0278 JB |
411 | else |
412 | Feval (Fcar (args_left)); | |
413 | args_left = Fcdr (args_left); | |
414 | } | |
87d238ba | 415 | while (!NILP (args_left)); |
db9f0278 JB |
416 | |
417 | UNGCPRO; | |
418 | return val; | |
419 | } | |
420 | ||
421 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
422 | doc: /* Set each SYM to the value of its VAL. |
423 | The symbols SYM are variables; they are literal (not evaluated). | |
424 | The values VAL are expressions; they are evaluated. | |
425 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
426 | The second VAL is not computed until after the first SYM is set, and so on; | |
427 | each VAL can use the new value of variables set earlier in the `setq'. | |
428 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 429 | usage: (setq [SYM VAL]...) */) |
5842a27b | 430 | (Lisp_Object args) |
db9f0278 JB |
431 | { |
432 | register Lisp_Object args_left; | |
433 | register Lisp_Object val, sym; | |
434 | struct gcpro gcpro1; | |
435 | ||
1283140e | 436 | if (NILP (args)) |
db9f0278 JB |
437 | return Qnil; |
438 | ||
439 | args_left = args; | |
440 | GCPRO1 (args); | |
441 | ||
442 | do | |
443 | { | |
444 | val = Feval (Fcar (Fcdr (args_left))); | |
445 | sym = Fcar (args_left); | |
446 | Fset (sym, val); | |
447 | args_left = Fcdr (Fcdr (args_left)); | |
448 | } | |
265a9e55 | 449 | while (!NILP(args_left)); |
db9f0278 JB |
450 | |
451 | UNGCPRO; | |
452 | return val; | |
453 | } | |
177c0ea7 | 454 | |
db9f0278 | 455 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
456 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
457 | usage: (quote ARG) */) | |
5842a27b | 458 | (Lisp_Object args) |
db9f0278 | 459 | { |
1283140e RS |
460 | if (!NILP (Fcdr (args))) |
461 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
462 | return Fcar (args); |
463 | } | |
177c0ea7 | 464 | |
db9f0278 | 465 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
466 | doc: /* Like `quote', but preferred for objects which are functions. |
467 | In byte compilation, `function' causes its argument to be compiled. | |
468 | `quote' cannot do that. | |
469 | usage: (function ARG) */) | |
5842a27b | 470 | (Lisp_Object args) |
db9f0278 | 471 | { |
1283140e RS |
472 | if (!NILP (Fcdr (args))) |
473 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
db9f0278 JB |
474 | return Fcar (args); |
475 | } | |
476 | ||
e0f331ab | 477 | |
db9f0278 | 478 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
84b17ab0 | 479 | doc: /* Return t if the containing function was run directly by user input. |
82fc29a1 JB |
480 | This means that the function was called with `call-interactively' |
481 | \(which includes being called as the binding of a key) | |
84b17ab0 | 482 | and input is currently coming from the keyboard (not a keyboard macro), |
c63df42b RS |
483 | and Emacs is not running in batch mode (`noninteractive' is nil). |
484 | ||
485 | The only known proper use of `interactive-p' is in deciding whether to | |
486 | display a helpful message, or how to display it. If you're thinking | |
487 | of using it for any other purpose, it is quite likely that you're | |
488 | making a mistake. Think: what do you want to do when the command is | |
489 | called from a keyboard macro? | |
490 | ||
84b17ab0 CY |
491 | To test whether your function was called with `call-interactively', |
492 | either (i) add an extra optional argument and give it an `interactive' | |
493 | spec that specifies non-nil unconditionally (such as \"p\"); or (ii) | |
494 | use `called-interactively-p'. */) | |
5842a27b | 495 | (void) |
db9f0278 | 496 | { |
c63df42b | 497 | return (INTERACTIVE && interactive_p (1)) ? Qt : Qnil; |
e0f331ab GM |
498 | } |
499 | ||
500 | ||
9d28c33e | 501 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 1, 0, |
84b17ab0 | 502 | doc: /* Return t if the containing function was called by `call-interactively'. |
9d28c33e SM |
503 | If KIND is `interactive', then only return t if the call was made |
504 | interactively by the user, i.e. not in `noninteractive' mode nor | |
505 | when `executing-kbd-macro'. | |
506 | If KIND is `any', on the other hand, it will return t for any kind of | |
507 | interactive call, including being called as the binding of a key, or | |
508 | from a keyboard macro, or in `noninteractive' mode. | |
509 | ||
510 | The only known proper use of `interactive' for KIND is in deciding | |
511 | whether to display a helpful message, or how to display it. If you're | |
512 | thinking of using it for any other purpose, it is quite likely that | |
513 | you're making a mistake. Think: what do you want to do when the | |
514 | command is called from a keyboard macro? | |
84b17ab0 CY |
515 | |
516 | This function is meant for implementing advice and other | |
517 | function-modifying features. Instead of using this, it is sometimes | |
518 | cleaner to give your function an extra optional argument whose | |
519 | `interactive' spec specifies non-nil unconditionally (\"p\" is a good | |
9d28c33e | 520 | way to do this), or via (not (or executing-kbd-macro noninteractive)). */) |
5842a27b | 521 | (Lisp_Object kind) |
c63df42b | 522 | { |
9d28c33e SM |
523 | return ((INTERACTIVE || !EQ (kind, intern ("interactive"))) |
524 | && interactive_p (1)) ? Qt : Qnil; | |
c63df42b RS |
525 | } |
526 | ||
527 | ||
528 | /* Return 1 if function in which this appears was called using | |
529 | call-interactively. | |
e0f331ab GM |
530 | |
531 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
532 | called is a built-in. */ | |
533 | ||
2f7c71a1 | 534 | static int |
d3da34e0 | 535 | interactive_p (int exclude_subrs_p) |
e0f331ab GM |
536 | { |
537 | struct backtrace *btp; | |
538 | Lisp_Object fun; | |
db9f0278 | 539 | |
db9f0278 | 540 | btp = backtrace_list; |
daa37602 JB |
541 | |
542 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 543 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 544 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
545 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
546 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 547 | btp = btp->next; |
daa37602 JB |
548 | |
549 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
550 | may be a frame for Fbytecode at the top level. In any version of |
551 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
552 | inside catch and condition-case. Skip past them. | |
daa37602 | 553 | |
4402a9ed | 554 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 555 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
556 | while (btp |
557 | && (EQ (*btp->function, Qbytecode) | |
558 | || btp->nargs == UNEVALLED)) | |
a6e3fa71 JB |
559 | btp = btp->next; |
560 | ||
daa37602 JB |
561 | /* btp now points at the frame of the innermost function that isn't |
562 | a special form, ignoring frames for Finteractive_p and/or | |
563 | Fbytecode at the top. If this frame is for a built-in function | |
564 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 565 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
566 | if (exclude_subrs_p && SUBRP (fun)) |
567 | return 0; | |
177c0ea7 | 568 | |
db9f0278 JB |
569 | /* btp points to the frame of a Lisp function that called interactive-p. |
570 | Return t if that function was called interactively. */ | |
571 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
572 | return 1; |
573 | return 0; | |
db9f0278 JB |
574 | } |
575 | ||
e0f331ab | 576 | |
db9f0278 | 577 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
578 | doc: /* Define NAME as a function. |
579 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
580 | See also the function `interactive'. | |
7a25dc6d | 581 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
5842a27b | 582 | (Lisp_Object args) |
db9f0278 JB |
583 | { |
584 | register Lisp_Object fn_name; | |
585 | register Lisp_Object defn; | |
586 | ||
587 | fn_name = Fcar (args); | |
6992a868 | 588 | CHECK_SYMBOL (fn_name); |
db9f0278 | 589 | defn = Fcons (Qlambda, Fcdr (args)); |
265a9e55 | 590 | if (!NILP (Vpurify_flag)) |
db9f0278 | 591 | defn = Fpurecopy (defn); |
f58e9f8c RS |
592 | if (CONSP (XSYMBOL (fn_name)->function) |
593 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
594 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 595 | Ffset (fn_name, defn); |
6fd797f5 | 596 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
597 | return fn_name; |
598 | } | |
599 | ||
600 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 601 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
602 | The actual definition looks like |
603 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
604 | When the macro is called, as in (NAME ARGS...), |
605 | the function (lambda ARGLIST BODY...) is applied to | |
606 | the list ARGS... as it appears in the expression, | |
607 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
608 | |
609 | DECL is a declaration, optional, which can specify how to indent | |
4ba50634 JPW |
610 | calls to this macro, how Edebug should handle it, and which argument |
611 | should be treated as documentation. It looks like this: | |
0654d6e3 RS |
612 | (declare SPECS...) |
613 | The elements can look like this: | |
614 | (indent INDENT) | |
615 | Set NAME's `lisp-indent-function' property to INDENT. | |
616 | ||
e509f168 | 617 | (debug DEBUG) |
0654d6e3 | 618 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 619 | equivalent to writing a `def-edebug-spec' for the macro.) |
4ba50634 JPW |
620 | |
621 | (doc-string ELT) | |
622 | Set NAME's `doc-string-elt' property to ELT. | |
623 | ||
0654d6e3 | 624 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
5842a27b | 625 | (Lisp_Object args) |
db9f0278 JB |
626 | { |
627 | register Lisp_Object fn_name; | |
628 | register Lisp_Object defn; | |
d6edd563 | 629 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
630 | |
631 | fn_name = Fcar (args); | |
8e975df9 | 632 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
633 | lambda_list = Fcar (Fcdr (args)); |
634 | tail = Fcdr (Fcdr (args)); | |
635 | ||
636 | doc = Qnil; | |
637 | if (STRINGP (Fcar (tail))) | |
638 | { | |
e509f168 SM |
639 | doc = XCAR (tail); |
640 | tail = XCDR (tail); | |
d6edd563 GM |
641 | } |
642 | ||
0193499f SM |
643 | if (CONSP (Fcar (tail)) |
644 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
d6edd563 GM |
645 | { |
646 | if (!NILP (Vmacro_declaration_function)) | |
647 | { | |
648 | struct gcpro gcpro1; | |
649 | GCPRO1 (args); | |
650 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
651 | UNGCPRO; | |
652 | } | |
177c0ea7 | 653 | |
d6edd563 GM |
654 | tail = Fcdr (tail); |
655 | } | |
656 | ||
657 | if (NILP (doc)) | |
658 | tail = Fcons (lambda_list, tail); | |
659 | else | |
660 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
661 | defn = Fcons (Qmacro, Fcons (Qlambda, tail)); | |
177c0ea7 | 662 | |
265a9e55 | 663 | if (!NILP (Vpurify_flag)) |
db9f0278 | 664 | defn = Fpurecopy (defn); |
f58e9f8c RS |
665 | if (CONSP (XSYMBOL (fn_name)->function) |
666 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
667 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 668 | Ffset (fn_name, defn); |
6fd797f5 | 669 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
670 | return fn_name; |
671 | } | |
672 | ||
19cebf5a | 673 | |
1848d15d | 674 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 675 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 676 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 677 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
678 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
679 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
680 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
681 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 682 | The return value is BASE-VARIABLE. */) |
5842a27b | 683 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
684 | { |
685 | struct Lisp_Symbol *sym; | |
1848d15d | 686 | |
4a9308b8 JB |
687 | CHECK_SYMBOL (new_alias); |
688 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 689 | |
4a9308b8 | 690 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
691 | |
692 | if (sym->constant) | |
178f2507 SM |
693 | /* Not sure why, but why not? */ |
694 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
695 | |
696 | switch (sym->redirect) | |
697 | { | |
698 | case SYMBOL_FORWARDED: | |
699 | error ("Cannot make an internal variable an alias"); | |
700 | case SYMBOL_LOCALIZED: | |
701 | error ("Don't know how to make a localized variable an alias"); | |
702 | } | |
703 | ||
dd60787c | 704 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
705 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
706 | so that old-code that affects n_a before the aliasing is setup | |
707 | still works. */ | |
708 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 709 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
710 | |
711 | { | |
712 | struct specbinding *p; | |
713 | ||
714 | for (p = specpdl_ptr - 1; p >= specpdl; p--) | |
715 | if (p->func == NULL | |
716 | && (EQ (new_alias, | |
717 | CONSP (p->symbol) ? XCAR (p->symbol) : p->symbol))) | |
718 | error ("Don't know how to make a let-bound variable an alias"); | |
719 | } | |
720 | ||
721 | sym->redirect = SYMBOL_VARALIAS; | |
722 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
723 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
724 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
725 | /* Even if docstring is nil: remove old docstring. */ |
726 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 727 | |
4a9308b8 | 728 | return base_variable; |
19cebf5a GM |
729 | } |
730 | ||
731 | ||
db9f0278 | 732 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 733 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
734 | You are not required to define a variable in order to use it, |
735 | but the definition can supply documentation and an initial value | |
736 | in a way that tags can recognize. | |
737 | ||
738 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
739 | If SYMBOL is buffer-local, its default value is what is set; | |
740 | buffer-local values are not affected. | |
741 | INITVALUE and DOCSTRING are optional. | |
742 | If DOCSTRING starts with *, this variable is identified as a user option. | |
743 | This means that M-x set-variable recognizes it. | |
744 | See also `user-variable-p'. | |
745 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
746 | |
747 | If SYMBOL has a local binding, then this form affects the local | |
748 | binding. This is usually not what you want. Thus, if you need to | |
749 | load a file defining variables, with this form or with `defconst' or | |
750 | `defcustom', you should always load that file _outside_ any bindings | |
751 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
752 | this respect.) | |
2df5238c | 753 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 754 | (Lisp_Object args) |
db9f0278 | 755 | { |
a42ba017 | 756 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
757 | |
758 | sym = Fcar (args); | |
a42ba017 RS |
759 | tail = Fcdr (args); |
760 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 761 | error ("Too many arguments"); |
a42ba017 | 762 | |
33568849 | 763 | tem = Fdefault_boundp (sym); |
a42ba017 | 764 | if (!NILP (tail)) |
db9f0278 | 765 | { |
1c9916a1 SM |
766 | if (SYMBOL_CONSTANT_P (sym)) |
767 | { | |
768 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
769 | Lisp_Object tem = Fcar (tail); | |
770 | if (! (CONSP (tem) | |
771 | && EQ (XCAR (tem), Qquote) | |
772 | && CONSP (XCDR (tem)) | |
773 | && EQ (XCAR (XCDR (tem)), sym))) | |
774 | error ("Constant symbol `%s' specified in defvar", | |
775 | SDATA (SYMBOL_NAME (sym))); | |
776 | } | |
777 | ||
265a9e55 | 778 | if (NILP (tem)) |
33568849 | 779 | Fset_default (sym, Feval (Fcar (tail))); |
d0bce91e SM |
780 | else |
781 | { /* Check if there is really a global binding rather than just a let | |
782 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 783 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
784 | while (--pdl >= specpdl) |
785 | { | |
786 | if (EQ (pdl->symbol, sym) && !pdl->func | |
787 | && EQ (pdl->old_value, Qunbound)) | |
788 | { | |
789 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
790 | SYMBOL_NAME (sym), 1); | |
791 | break; | |
792 | } | |
793 | } | |
794 | } | |
33568849 | 795 | tail = Fcdr (tail); |
e509f168 SM |
796 | tem = Fcar (tail); |
797 | if (!NILP (tem)) | |
33568849 | 798 | { |
33568849 SM |
799 | if (!NILP (Vpurify_flag)) |
800 | tem = Fpurecopy (tem); | |
801 | Fput (sym, Qvariable_documentation, tem); | |
802 | } | |
6fd797f5 | 803 | LOADHIST_ATTACH (sym); |
db9f0278 | 804 | } |
33568849 | 805 | else |
d7c1d0fc RS |
806 | /* Simple (defvar <var>) should not count as a definition at all. |
807 | It could get in the way of other definitions, and unloading this | |
808 | package could try to make the variable unbound. */ | |
addf35fd AS |
809 | ; |
810 | ||
db9f0278 JB |
811 | return sym; |
812 | } | |
813 | ||
814 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
815 | doc: /* Define SYMBOL as a constant variable. |
816 | The intent is that neither programs nor users should ever change this value. | |
817 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
818 | If SYMBOL is buffer-local, its default value is what is set; | |
819 | buffer-local values are not affected. | |
820 | DOCSTRING is optional. | |
733f68b6 LT |
821 | |
822 | If SYMBOL has a local binding, then this form sets the local binding's | |
823 | value. However, you should normally not make local bindings for | |
824 | variables defined with this form. | |
7a25dc6d | 825 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 826 | (Lisp_Object args) |
db9f0278 JB |
827 | { |
828 | register Lisp_Object sym, tem; | |
829 | ||
830 | sym = Fcar (args); | |
a42ba017 | 831 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 832 | error ("Too many arguments"); |
a42ba017 | 833 | |
1182a7cb DL |
834 | tem = Feval (Fcar (Fcdr (args))); |
835 | if (!NILP (Vpurify_flag)) | |
836 | tem = Fpurecopy (tem); | |
837 | Fset_default (sym, tem); | |
db9f0278 | 838 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 839 | if (!NILP (tem)) |
db9f0278 | 840 | { |
265a9e55 | 841 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
842 | tem = Fpurecopy (tem); |
843 | Fput (sym, Qvariable_documentation, tem); | |
844 | } | |
873759d5 | 845 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 846 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
847 | return sym; |
848 | } | |
849 | ||
606cdb89 JB |
850 | /* Error handler used in Fuser_variable_p. */ |
851 | static Lisp_Object | |
d3da34e0 | 852 | user_variable_p_eh (Lisp_Object ignore) |
606cdb89 JB |
853 | { |
854 | return Qnil; | |
855 | } | |
856 | ||
40a69fac SM |
857 | static Lisp_Object |
858 | lisp_indirect_variable (Lisp_Object sym) | |
859 | { | |
860 | XSETSYMBOL (sym, indirect_variable (XSYMBOL (sym))); | |
861 | return sym; | |
862 | } | |
863 | ||
db9f0278 | 864 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 865 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 866 | \(The alternative is a variable used internally in a Lisp program.) |
606cdb89 JB |
867 | A variable is a user variable if |
868 | \(1) the first character of its documentation is `*', or | |
869 | \(2) it is customizable (its property list contains a non-nil value | |
870 | of `standard-value' or `custom-autoload'), or | |
871 | \(3) it is an alias for another user variable. | |
872 | Return nil if VARIABLE is an alias and there is a loop in the | |
873 | chain of symbols. */) | |
5842a27b | 874 | (Lisp_Object variable) |
db9f0278 JB |
875 | { |
876 | Lisp_Object documentation; | |
177c0ea7 | 877 | |
5e78e475 RS |
878 | if (!SYMBOLP (variable)) |
879 | return Qnil; | |
880 | ||
606cdb89 | 881 | /* If indirect and there's an alias loop, don't check anything else. */ |
ce5b453a | 882 | if (XSYMBOL (variable)->redirect == SYMBOL_VARALIAS |
40a69fac | 883 | && NILP (internal_condition_case_1 (lisp_indirect_variable, variable, |
bb8e180f | 884 | Qt, user_variable_p_eh))) |
606cdb89 JB |
885 | return Qnil; |
886 | ||
887 | while (1) | |
888 | { | |
889 | documentation = Fget (variable, Qvariable_documentation); | |
890 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
bb8e180f | 891 | return Qt; |
606cdb89 | 892 | if (STRINGP (documentation) |
bb8e180f AS |
893 | && ((unsigned char) SREF (documentation, 0) == '*')) |
894 | return Qt; | |
606cdb89 JB |
895 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ |
896 | if (CONSP (documentation) | |
bb8e180f AS |
897 | && STRINGP (XCAR (documentation)) |
898 | && INTEGERP (XCDR (documentation)) | |
899 | && XINT (XCDR (documentation)) < 0) | |
900 | return Qt; | |
606cdb89 JB |
901 | /* Customizable? See `custom-variable-p'. */ |
902 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
bb8e180f AS |
903 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) |
904 | return Qt; | |
606cdb89 | 905 | |
ce5b453a | 906 | if (!(XSYMBOL (variable)->redirect == SYMBOL_VARALIAS)) |
bb8e180f | 907 | return Qnil; |
606cdb89 JB |
908 | |
909 | /* An indirect variable? Let's follow the chain. */ | |
ce5b453a | 910 | XSETSYMBOL (variable, SYMBOL_ALIAS (XSYMBOL (variable))); |
606cdb89 | 911 | } |
177c0ea7 | 912 | } |
db9f0278 JB |
913 | \f |
914 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
915 | doc: /* Bind variables according to VARLIST then eval BODY. |
916 | The value of the last form in BODY is returned. | |
917 | Each element of VARLIST is a symbol (which is bound to nil) | |
918 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
919 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 920 | usage: (let* VARLIST BODY...) */) |
5842a27b | 921 | (Lisp_Object args) |
db9f0278 JB |
922 | { |
923 | Lisp_Object varlist, val, elt; | |
aed13378 | 924 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
925 | struct gcpro gcpro1, gcpro2, gcpro3; |
926 | ||
927 | GCPRO3 (args, elt, varlist); | |
928 | ||
929 | varlist = Fcar (args); | |
265a9e55 | 930 | while (!NILP (varlist)) |
db9f0278 JB |
931 | { |
932 | QUIT; | |
933 | elt = Fcar (varlist); | |
90165123 | 934 | if (SYMBOLP (elt)) |
db9f0278 | 935 | specbind (elt, Qnil); |
08564963 | 936 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 937 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
938 | else |
939 | { | |
940 | val = Feval (Fcar (Fcdr (elt))); | |
941 | specbind (Fcar (elt), val); | |
942 | } | |
943 | varlist = Fcdr (varlist); | |
944 | } | |
945 | UNGCPRO; | |
946 | val = Fprogn (Fcdr (args)); | |
947 | return unbind_to (count, val); | |
948 | } | |
949 | ||
950 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
951 | doc: /* Bind variables according to VARLIST then eval BODY. |
952 | The value of the last form in BODY is returned. | |
953 | Each element of VARLIST is a symbol (which is bound to nil) | |
954 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
955 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 956 | usage: (let VARLIST BODY...) */) |
5842a27b | 957 | (Lisp_Object args) |
db9f0278 JB |
958 | { |
959 | Lisp_Object *temps, tem; | |
960 | register Lisp_Object elt, varlist; | |
aed13378 | 961 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
962 | register int argnum; |
963 | struct gcpro gcpro1, gcpro2; | |
3a7a9129 | 964 | USE_SAFE_ALLOCA; |
db9f0278 JB |
965 | |
966 | varlist = Fcar (args); | |
967 | ||
968 | /* Make space to hold the values to give the bound variables */ | |
969 | elt = Flength (varlist); | |
b72e0717 | 970 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 JB |
971 | |
972 | /* Compute the values and store them in `temps' */ | |
973 | ||
974 | GCPRO2 (args, *temps); | |
975 | gcpro2.nvars = 0; | |
976 | ||
67ee9f6e | 977 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
978 | { |
979 | QUIT; | |
67ee9f6e | 980 | elt = XCAR (varlist); |
90165123 | 981 | if (SYMBOLP (elt)) |
db9f0278 | 982 | temps [argnum++] = Qnil; |
08564963 | 983 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 984 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
985 | else |
986 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
987 | gcpro2.nvars = argnum; | |
988 | } | |
989 | UNGCPRO; | |
990 | ||
991 | varlist = Fcar (args); | |
67ee9f6e | 992 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 993 | { |
67ee9f6e | 994 | elt = XCAR (varlist); |
db9f0278 | 995 | tem = temps[argnum++]; |
90165123 | 996 | if (SYMBOLP (elt)) |
db9f0278 JB |
997 | specbind (elt, tem); |
998 | else | |
999 | specbind (Fcar (elt), tem); | |
1000 | } | |
1001 | ||
1002 | elt = Fprogn (Fcdr (args)); | |
3a7a9129 | 1003 | SAFE_FREE (); |
db9f0278 JB |
1004 | return unbind_to (count, elt); |
1005 | } | |
1006 | ||
1007 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1008 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1009 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1010 | until TEST returns nil. | |
7a25dc6d | 1011 | usage: (while TEST BODY...) */) |
5842a27b | 1012 | (Lisp_Object args) |
db9f0278 | 1013 | { |
2b9bde76 | 1014 | Lisp_Object test, body; |
db9f0278 JB |
1015 | struct gcpro gcpro1, gcpro2; |
1016 | ||
1017 | GCPRO2 (test, body); | |
1018 | ||
1019 | test = Fcar (args); | |
1020 | body = Fcdr (args); | |
2b9bde76 | 1021 | while (!NILP (Feval (test))) |
db9f0278 JB |
1022 | { |
1023 | QUIT; | |
1024 | Fprogn (body); | |
1025 | } | |
1026 | ||
1027 | UNGCPRO; | |
1028 | return Qnil; | |
1029 | } | |
1030 | ||
1031 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1032 | doc: /* Return result of expanding macros at top level of FORM. |
1033 | If FORM is not a macro call, it is returned unchanged. | |
1034 | Otherwise, the macro is expanded and the expansion is considered | |
1035 | in place of FORM. When a non-macro-call results, it is returned. | |
1036 | ||
1037 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1038 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 1039 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 1040 | { |
23d6b5a6 | 1041 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1042 | register Lisp_Object expander, sym, def, tem; |
1043 | ||
1044 | while (1) | |
1045 | { | |
1046 | /* Come back here each time we expand a macro call, | |
1047 | in case it expands into another macro call. */ | |
90165123 | 1048 | if (!CONSP (form)) |
db9f0278 | 1049 | break; |
23d6b5a6 | 1050 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1051 | def = sym = XCAR (form); |
23d6b5a6 | 1052 | tem = Qnil; |
db9f0278 JB |
1053 | /* Trace symbols aliases to other symbols |
1054 | until we get a symbol that is not an alias. */ | |
90165123 | 1055 | while (SYMBOLP (def)) |
db9f0278 JB |
1056 | { |
1057 | QUIT; | |
23d6b5a6 | 1058 | sym = def; |
79e8bfbf | 1059 | tem = Fassq (sym, environment); |
265a9e55 | 1060 | if (NILP (tem)) |
db9f0278 JB |
1061 | { |
1062 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1063 | if (!EQ (def, Qunbound)) |
1064 | continue; | |
db9f0278 | 1065 | } |
23d6b5a6 | 1066 | break; |
db9f0278 | 1067 | } |
79e8bfbf | 1068 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1069 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1070 | if (NILP (tem)) |
db9f0278 | 1071 | { |
79e8bfbf | 1072 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1073 | Look at its function definition. */ |
90165123 | 1074 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
1075 | /* Not defined or definition not suitable */ |
1076 | break; | |
03699b14 | 1077 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1078 | { |
1079 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1080 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1081 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1082 | /* Yes, load it and try again. */ |
1083 | { | |
ca20916b RS |
1084 | struct gcpro gcpro1; |
1085 | GCPRO1 (form); | |
ee9ee63c | 1086 | do_autoload (def, sym); |
ca20916b | 1087 | UNGCPRO; |
ee9ee63c JB |
1088 | continue; |
1089 | } | |
1090 | else | |
db9f0278 | 1091 | break; |
db9f0278 | 1092 | } |
03699b14 | 1093 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1094 | break; |
03699b14 | 1095 | else expander = XCDR (def); |
db9f0278 JB |
1096 | } |
1097 | else | |
1098 | { | |
03699b14 | 1099 | expander = XCDR (tem); |
265a9e55 | 1100 | if (NILP (expander)) |
db9f0278 JB |
1101 | break; |
1102 | } | |
03699b14 | 1103 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1104 | } |
1105 | return form; | |
1106 | } | |
1107 | \f | |
1108 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1109 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1110 | TAG is evalled to get the tag to use; it must not be nil. | |
1111 | ||
1112 | Then the BODY is executed. | |
1d632ccf | 1113 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1114 | If no throw happens, `catch' returns the value of the last BODY form. |
1115 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1116 | usage: (catch TAG BODY...) */) |
5842a27b | 1117 | (Lisp_Object args) |
db9f0278 JB |
1118 | { |
1119 | register Lisp_Object tag; | |
1120 | struct gcpro gcpro1; | |
1121 | ||
1122 | GCPRO1 (args); | |
1123 | tag = Feval (Fcar (args)); | |
1124 | UNGCPRO; | |
1125 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1126 | } | |
1127 | ||
1128 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1129 | FUNC should return a Lisp_Object. | |
1130 | This is how catches are done from within C code. */ | |
1131 | ||
1132 | Lisp_Object | |
d3da34e0 | 1133 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1134 | { |
1135 | /* This structure is made part of the chain `catchlist'. */ | |
1136 | struct catchtag c; | |
1137 | ||
1138 | /* Fill in the components of c, and put it on the list. */ | |
1139 | c.next = catchlist; | |
1140 | c.tag = tag; | |
1141 | c.val = Qnil; | |
1142 | c.backlist = backtrace_list; | |
1143 | c.handlerlist = handlerlist; | |
1144 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1145 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1146 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1147 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1148 | c.gcpro = gcprolist; |
bcf28080 | 1149 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1150 | catchlist = &c; |
1151 | ||
1152 | /* Call FUNC. */ | |
1153 | if (! _setjmp (c.jmp)) | |
1154 | c.val = (*func) (arg); | |
1155 | ||
1156 | /* Throw works by a longjmp that comes right here. */ | |
1157 | catchlist = c.next; | |
1158 | return c.val; | |
1159 | } | |
1160 | ||
ba410f40 JB |
1161 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1162 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1163 | |
ba410f40 JB |
1164 | This is the guts Fthrow and Fsignal; they differ only in the way |
1165 | they choose the catch tag to throw to. A catch tag for a | |
1166 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1167 | |
ba410f40 JB |
1168 | Before each catch is discarded, unbind all special bindings and |
1169 | execute all unwind-protect clauses made above that catch. Unwind | |
1170 | the handler stack as we go, so that the proper handlers are in | |
1171 | effect for each unwind-protect clause we run. At the end, restore | |
1172 | some static info saved in CATCH, and longjmp to the location | |
1173 | specified in the | |
1174 | ||
1175 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1176 | |
1177 | static void | |
d3da34e0 | 1178 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 JB |
1179 | { |
1180 | register int last_time; | |
1181 | ||
ba410f40 JB |
1182 | /* Save the value in the tag. */ |
1183 | catch->val = value; | |
1184 | ||
0b31741c | 1185 | /* Restore certain special C variables. */ |
1cdc3155 | 1186 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1187 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1188 | handling_signal = 0; |
69bbd6bd | 1189 | immediate_quit = 0; |
82da7701 | 1190 | |
db9f0278 JB |
1191 | do |
1192 | { | |
1193 | last_time = catchlist == catch; | |
82da7701 JB |
1194 | |
1195 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1196 | handlers. */ |
db9f0278 JB |
1197 | unbind_to (catchlist->pdlcount, Qnil); |
1198 | handlerlist = catchlist->handlerlist; | |
1199 | catchlist = catchlist->next; | |
1200 | } | |
1201 | while (! last_time); | |
1202 | ||
a2a103bb | 1203 | #if HAVE_X_WINDOWS |
88019a63 RS |
1204 | /* If x_catch_errors was done, turn it off now. |
1205 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 | 1206 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
bb8e180f AS |
1207 | The catch must remain in effect during that delicate |
1208 | state. --lorentey */ | |
88019a63 | 1209 | x_fully_uncatch_errors (); |
e6aee454 | 1210 | #endif |
a2a103bb | 1211 | #endif |
88019a63 | 1212 | |
bcf28080 | 1213 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1214 | gcprolist = catch->gcpro; |
15934ffa RS |
1215 | #ifdef DEBUG_GCPRO |
1216 | if (gcprolist != 0) | |
1217 | gcpro_level = gcprolist->level + 1; | |
1218 | else | |
1219 | gcpro_level = 0; | |
1220 | #endif | |
db9f0278 JB |
1221 | backtrace_list = catch->backlist; |
1222 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1223 | |
ba410f40 | 1224 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1225 | } |
1226 | ||
1227 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
9dbc9081 PJ |
1228 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1229 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1230 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1231 | { |
1232 | register struct catchtag *c; | |
1233 | ||
8788120f KS |
1234 | if (!NILP (tag)) |
1235 | for (c = catchlist; c; c = c->next) | |
1236 | { | |
1237 | if (EQ (c->tag, tag)) | |
1238 | unwind_to_catch (c, value); | |
1239 | } | |
734d55a2 | 1240 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1241 | } |
1242 | ||
1243 | ||
1244 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1245 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1246 | If BODYFORM completes normally, its value is returned | |
1247 | after executing the UNWINDFORMS. | |
1248 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1249 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1250 | (Lisp_Object args) |
db9f0278 JB |
1251 | { |
1252 | Lisp_Object val; | |
aed13378 | 1253 | int count = SPECPDL_INDEX (); |
db9f0278 | 1254 | |
04b28167 | 1255 | record_unwind_protect (Fprogn, Fcdr (args)); |
db9f0278 | 1256 | val = Feval (Fcar (args)); |
177c0ea7 | 1257 | return unbind_to (count, val); |
db9f0278 JB |
1258 | } |
1259 | \f | |
1260 | /* Chain of condition handlers currently in effect. | |
1261 | The elements of this chain are contained in the stack frames | |
1262 | of Fcondition_case and internal_condition_case. | |
1263 | When an error is signaled (by calling Fsignal, below), | |
1264 | this chain is searched for an element that applies. */ | |
1265 | ||
1266 | struct handler *handlerlist; | |
1267 | ||
1268 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
9dbc9081 | 1269 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1270 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1271 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1272 | where the BODY is made of Lisp expressions. | |
1273 | ||
1274 | A handler is applicable to an error | |
1275 | if CONDITION-NAME is one of the error's condition names. | |
1276 | If an error happens, the first applicable handler is run. | |
1277 | ||
1278 | The car of a handler may be a list of condition names | |
c997bb25 | 1279 | instead of a single condition name. Then it handles all of them. |
9dbc9081 | 1280 | |
c997bb25 RS |
1281 | When a handler handles an error, control returns to the `condition-case' |
1282 | and it executes the handler's BODY... | |
d0acbbaf | 1283 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1284 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1285 | Then the value of the last BODY form is returned from the `condition-case' |
1286 | expression. | |
9dbc9081 | 1287 | |
9dbc9081 | 1288 | See also the function `signal' for more info. |
2b47b74d | 1289 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1290 | (Lisp_Object args) |
db9f0278 | 1291 | { |
17401c97 GM |
1292 | register Lisp_Object bodyform, handlers; |
1293 | volatile Lisp_Object var; | |
db9f0278 | 1294 | |
82da7701 JB |
1295 | var = Fcar (args); |
1296 | bodyform = Fcar (Fcdr (args)); | |
1297 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1298 | |
1299 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1300 | } | |
1301 | ||
1302 | /* Like Fcondition_case, but the args are separate | |
1303 | rather than passed in a list. Used by Fbyte_code. */ | |
1304 | ||
1305 | Lisp_Object | |
d3da34e0 JB |
1306 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1307 | Lisp_Object handlers) | |
ee830945 RS |
1308 | { |
1309 | Lisp_Object val; | |
1310 | struct catchtag c; | |
1311 | struct handler h; | |
1312 | ||
b7826503 | 1313 | CHECK_SYMBOL (var); |
82da7701 | 1314 | |
2b47b74d | 1315 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1316 | { |
1317 | Lisp_Object tem; | |
2b47b74d | 1318 | tem = XCAR (val); |
5f96776a RS |
1319 | if (! (NILP (tem) |
1320 | || (CONSP (tem) | |
03699b14 KR |
1321 | && (SYMBOLP (XCAR (tem)) |
1322 | || CONSP (XCAR (tem)))))) | |
82da7701 JB |
1323 | error ("Invalid condition handler", tem); |
1324 | } | |
db9f0278 JB |
1325 | |
1326 | c.tag = Qnil; | |
1327 | c.val = Qnil; | |
1328 | c.backlist = backtrace_list; | |
1329 | c.handlerlist = handlerlist; | |
1330 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1331 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1332 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1333 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1334 | c.gcpro = gcprolist; |
bcf28080 | 1335 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1336 | if (_setjmp (c.jmp)) |
1337 | { | |
265a9e55 | 1338 | if (!NILP (h.var)) |
bb8e180f | 1339 | specbind (h.var, c.val); |
9d58218c | 1340 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1341 | |
1342 | /* Note that this just undoes the binding of h.var; whoever | |
1343 | longjumped to us unwound the stack to c.pdlcount before | |
1344 | throwing. */ | |
db9f0278 JB |
1345 | unbind_to (c.pdlcount, Qnil); |
1346 | return val; | |
1347 | } | |
1348 | c.next = catchlist; | |
1349 | catchlist = &c; | |
177c0ea7 | 1350 | |
82da7701 JB |
1351 | h.var = var; |
1352 | h.handler = handlers; | |
db9f0278 | 1353 | h.next = handlerlist; |
db9f0278 JB |
1354 | h.tag = &c; |
1355 | handlerlist = &h; | |
1356 | ||
82da7701 | 1357 | val = Feval (bodyform); |
db9f0278 JB |
1358 | catchlist = c.next; |
1359 | handlerlist = h.next; | |
1360 | return val; | |
1361 | } | |
1362 | ||
f029ca5f RS |
1363 | /* Call the function BFUN with no arguments, catching errors within it |
1364 | according to HANDLERS. If there is an error, call HFUN with | |
1365 | one argument which is the data that describes the error: | |
1366 | (SIGNALNAME . DATA) | |
1367 | ||
1368 | HANDLERS can be a list of conditions to catch. | |
1369 | If HANDLERS is Qt, catch all errors. | |
1370 | If HANDLERS is Qerror, catch all errors | |
1371 | but allow the debugger to run if that is enabled. */ | |
1372 | ||
db9f0278 | 1373 | Lisp_Object |
d3da34e0 JB |
1374 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1375 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1376 | { |
1377 | Lisp_Object val; | |
1378 | struct catchtag c; | |
1379 | struct handler h; | |
1380 | ||
88019a63 RS |
1381 | /* Since Fsignal will close off all calls to x_catch_errors, |
1382 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1383 | #if HAVE_X_WINDOWS |
88019a63 | 1384 | if (x_catching_errors ()) |
01591d17 | 1385 | abort (); |
a2a103bb | 1386 | #endif |
01591d17 | 1387 | |
db9f0278 JB |
1388 | c.tag = Qnil; |
1389 | c.val = Qnil; | |
1390 | c.backlist = backtrace_list; | |
1391 | c.handlerlist = handlerlist; | |
1392 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1393 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1394 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1395 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1396 | c.gcpro = gcprolist; |
bcf28080 | 1397 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1398 | if (_setjmp (c.jmp)) |
1399 | { | |
9d58218c | 1400 | return (*hfun) (c.val); |
db9f0278 JB |
1401 | } |
1402 | c.next = catchlist; | |
1403 | catchlist = &c; | |
1404 | h.handler = handlers; | |
1405 | h.var = Qnil; | |
db9f0278 JB |
1406 | h.next = handlerlist; |
1407 | h.tag = &c; | |
1408 | handlerlist = &h; | |
1409 | ||
1410 | val = (*bfun) (); | |
1411 | catchlist = c.next; | |
1412 | handlerlist = h.next; | |
1413 | return val; | |
1414 | } | |
1415 | ||
2659a09f | 1416 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1417 | |
d227775c | 1418 | Lisp_Object |
d3da34e0 JB |
1419 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1420 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1421 | { |
1422 | Lisp_Object val; | |
1423 | struct catchtag c; | |
1424 | struct handler h; | |
1425 | ||
88019a63 RS |
1426 | /* Since Fsignal will close off all calls to x_catch_errors, |
1427 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1428 | #if HAVE_X_WINDOWS |
88019a63 RS |
1429 | if (x_catching_errors ()) |
1430 | abort (); | |
a2a103bb | 1431 | #endif |
88019a63 | 1432 | |
d227775c RS |
1433 | c.tag = Qnil; |
1434 | c.val = Qnil; | |
1435 | c.backlist = backtrace_list; | |
1436 | c.handlerlist = handlerlist; | |
1437 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1438 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1439 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1440 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1441 | c.gcpro = gcprolist; |
bcf28080 | 1442 | c.byte_stack = byte_stack_list; |
d227775c RS |
1443 | if (_setjmp (c.jmp)) |
1444 | { | |
9d58218c | 1445 | return (*hfun) (c.val); |
d227775c RS |
1446 | } |
1447 | c.next = catchlist; | |
1448 | catchlist = &c; | |
1449 | h.handler = handlers; | |
1450 | h.var = Qnil; | |
1451 | h.next = handlerlist; | |
1452 | h.tag = &c; | |
1453 | handlerlist = &h; | |
1454 | ||
1455 | val = (*bfun) (arg); | |
1456 | catchlist = c.next; | |
1457 | handlerlist = h.next; | |
1458 | return val; | |
1459 | } | |
10b29d41 | 1460 | |
53967e09 CY |
1461 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1462 | its arguments. */ | |
1463 | ||
1464 | Lisp_Object | |
178f2507 SM |
1465 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1466 | Lisp_Object arg1, | |
1467 | Lisp_Object arg2, | |
1468 | Lisp_Object handlers, | |
1469 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1470 | { |
1471 | Lisp_Object val; | |
1472 | struct catchtag c; | |
1473 | struct handler h; | |
1474 | ||
1475 | /* Since Fsignal will close off all calls to x_catch_errors, | |
1476 | we will get the wrong results if some are not closed now. */ | |
1477 | #if HAVE_X_WINDOWS | |
1478 | if (x_catching_errors ()) | |
1479 | abort (); | |
1480 | #endif | |
1481 | ||
1482 | c.tag = Qnil; | |
1483 | c.val = Qnil; | |
1484 | c.backlist = backtrace_list; | |
1485 | c.handlerlist = handlerlist; | |
1486 | c.lisp_eval_depth = lisp_eval_depth; | |
1487 | c.pdlcount = SPECPDL_INDEX (); | |
1488 | c.poll_suppress_count = poll_suppress_count; | |
1489 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1490 | c.gcpro = gcprolist; | |
1491 | c.byte_stack = byte_stack_list; | |
1492 | if (_setjmp (c.jmp)) | |
1493 | { | |
1494 | return (*hfun) (c.val); | |
1495 | } | |
1496 | c.next = catchlist; | |
1497 | catchlist = &c; | |
1498 | h.handler = handlers; | |
1499 | h.var = Qnil; | |
1500 | h.next = handlerlist; | |
1501 | h.tag = &c; | |
1502 | handlerlist = &h; | |
1503 | ||
1504 | val = (*bfun) (arg1, arg2); | |
1505 | catchlist = c.next; | |
1506 | handlerlist = h.next; | |
1507 | return val; | |
1508 | } | |
10b29d41 | 1509 | |
2659a09f | 1510 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1511 | and ARGS as second argument. */ |
1512 | ||
1513 | Lisp_Object | |
178f2507 SM |
1514 | internal_condition_case_n (Lisp_Object (*bfun) (int, Lisp_Object*), |
1515 | int nargs, | |
1516 | Lisp_Object *args, | |
1517 | Lisp_Object handlers, | |
1518 | Lisp_Object (*hfun) (Lisp_Object)) | |
10b29d41 GM |
1519 | { |
1520 | Lisp_Object val; | |
1521 | struct catchtag c; | |
1522 | struct handler h; | |
1523 | ||
88019a63 RS |
1524 | /* Since Fsignal will close off all calls to x_catch_errors, |
1525 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1526 | #if HAVE_X_WINDOWS |
88019a63 RS |
1527 | if (x_catching_errors ()) |
1528 | abort (); | |
a2a103bb | 1529 | #endif |
88019a63 | 1530 | |
10b29d41 GM |
1531 | c.tag = Qnil; |
1532 | c.val = Qnil; | |
1533 | c.backlist = backtrace_list; | |
1534 | c.handlerlist = handlerlist; | |
1535 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1536 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1537 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1538 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1539 | c.gcpro = gcprolist; |
1540 | c.byte_stack = byte_stack_list; | |
1541 | if (_setjmp (c.jmp)) | |
1542 | { | |
1543 | return (*hfun) (c.val); | |
1544 | } | |
1545 | c.next = catchlist; | |
1546 | catchlist = &c; | |
1547 | h.handler = handlers; | |
1548 | h.var = Qnil; | |
1549 | h.next = handlerlist; | |
1550 | h.tag = &c; | |
1551 | handlerlist = &h; | |
1552 | ||
1553 | val = (*bfun) (nargs, args); | |
1554 | catchlist = c.next; | |
1555 | handlerlist = h.next; | |
1556 | return val; | |
1557 | } | |
1558 | ||
d227775c | 1559 | \f |
f57e2426 | 1560 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object, |
bb8e180f | 1561 | Lisp_Object, Lisp_Object); |
db9f0278 JB |
1562 | |
1563 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
9dbc9081 PJ |
1564 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1565 | This function does not return. | |
1566 | ||
1567 | An error symbol is a symbol with an `error-conditions' property | |
1568 | that is a list of condition names. | |
1569 | A handler for any of those names will get to handle this signal. | |
1570 | The symbol `error' should normally be one of them. | |
1571 | ||
1572 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1573 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1574 | error message is constructed. | |
9dbc9081 PJ |
1575 | If the signal is handled, DATA is made available to the handler. |
1576 | See also the function `condition-case'. */) | |
5842a27b | 1577 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1578 | { |
bfa8ca43 | 1579 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1580 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1581 | That is a special case--don't do this in other situations. */ | |
db9f0278 JB |
1582 | register struct handler *allhandlers = handlerlist; |
1583 | Lisp_Object conditions; | |
c11d3d17 | 1584 | Lisp_Object string; |
1ea9dec4 | 1585 | Lisp_Object real_error_symbol; |
a2ff3819 | 1586 | struct backtrace *bp; |
db9f0278 | 1587 | |
346598f1 | 1588 | immediate_quit = handling_signal = 0; |
d063129f | 1589 | abort_on_gc = 0; |
db9f0278 JB |
1590 | if (gc_in_progress || waiting_for_input) |
1591 | abort (); | |
1592 | ||
1ea9dec4 RS |
1593 | if (NILP (error_symbol)) |
1594 | real_error_symbol = Fcar (data); | |
1595 | else | |
1596 | real_error_symbol = error_symbol; | |
1597 | ||
26631f2b RS |
1598 | #if 0 /* rms: I don't know why this was here, |
1599 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1600 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1601 | if (display_hourglass_p) |
1602 | cancel_hourglass (); | |
48f8dfa3 | 1603 | #endif |
177c0ea7 | 1604 | #endif |
48f8dfa3 | 1605 | |
61ede770 | 1606 | /* This hook is used by edebug. */ |
26631f2b RS |
1607 | if (! NILP (Vsignal_hook_function) |
1608 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1609 | { |
1610 | /* Edebug takes care of restoring these variables when it exits. */ | |
1611 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1612 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1613 | ||
1614 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1615 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1616 | ||
1617 | call2 (Vsignal_hook_function, error_symbol, data); | |
1618 | } | |
61ede770 | 1619 | |
1ea9dec4 | 1620 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1621 | |
a2ff3819 GM |
1622 | /* Remember from where signal was called. Skip over the frame for |
1623 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1624 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1625 | is a memory-full error. */ | |
090a072f | 1626 | Vsignaling_function = Qnil; |
26631f2b | 1627 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1628 | { |
1629 | bp = backtrace_list->next; | |
1630 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1631 | bp = bp->next; | |
1632 | if (bp && bp->function) | |
1633 | Vsignaling_function = *bp->function; | |
1634 | } | |
a2ff3819 | 1635 | |
db9f0278 JB |
1636 | for (; handlerlist; handlerlist = handlerlist->next) |
1637 | { | |
1638 | register Lisp_Object clause; | |
177c0ea7 | 1639 | |
db9f0278 | 1640 | clause = find_handler_clause (handlerlist->handler, conditions, |
f01cbfdd | 1641 | error_symbol, data); |
db9f0278 | 1642 | |
db9f0278 | 1643 | if (EQ (clause, Qlambda)) |
82da7701 | 1644 | { |
690337b7 KH |
1645 | /* We can't return values to code which signaled an error, but we |
1646 | can continue code which has signaled a quit. */ | |
1ea9dec4 | 1647 | if (EQ (real_error_symbol, Qquit)) |
82da7701 JB |
1648 | return Qnil; |
1649 | else | |
d3e6f8be | 1650 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1651 | } |
db9f0278 | 1652 | |
265a9e55 | 1653 | if (!NILP (clause)) |
db9f0278 | 1654 | { |
9d58218c | 1655 | Lisp_Object unwind_data; |
db9f0278 | 1656 | struct handler *h = handlerlist; |
9d58218c | 1657 | |
db9f0278 | 1658 | handlerlist = allhandlers; |
1ea9dec4 RS |
1659 | |
1660 | if (NILP (error_symbol)) | |
1661 | unwind_data = data; | |
9d58218c RS |
1662 | else |
1663 | unwind_data = Fcons (error_symbol, data); | |
1664 | h->chosen_clause = clause; | |
1665 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1666 | } |
1667 | } | |
1668 | ||
1669 | handlerlist = allhandlers; | |
1670 | /* If no handler is present now, try to run the debugger, | |
1671 | and if that fails, throw to top level. */ | |
f01cbfdd | 1672 | find_handler_clause (Qerror, conditions, error_symbol, data); |
c11d3d17 RS |
1673 | if (catchlist != 0) |
1674 | Fthrow (Qtop_level, Qt); | |
1675 | ||
1ea9dec4 | 1676 | if (! NILP (error_symbol)) |
c11d3d17 RS |
1677 | data = Fcons (error_symbol, data); |
1678 | ||
1679 | string = Ferror_message_string (data); | |
d5db4077 | 1680 | fatal ("%s", SDATA (string), 0); |
db9f0278 JB |
1681 | } |
1682 | ||
734d55a2 KS |
1683 | /* Internal version of Fsignal that never returns. |
1684 | Used for anything but Qquit (which can return from Fsignal). */ | |
1685 | ||
1686 | void | |
d3da34e0 | 1687 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1688 | { |
1689 | Fsignal (error_symbol, data); | |
1690 | abort (); | |
1691 | } | |
1692 | ||
1693 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1694 | ||
1695 | void | |
d3da34e0 | 1696 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1697 | { |
1698 | xsignal (error_symbol, Qnil); | |
1699 | } | |
1700 | ||
1701 | void | |
d3da34e0 | 1702 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1703 | { |
1704 | xsignal (error_symbol, list1 (arg)); | |
1705 | } | |
1706 | ||
1707 | void | |
d3da34e0 | 1708 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1709 | { |
1710 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1711 | } | |
1712 | ||
1713 | void | |
d3da34e0 | 1714 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1715 | { |
1716 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1717 | } | |
1718 | ||
1719 | /* Signal `error' with message S, and additional arg ARG. | |
1720 | If ARG is not a genuine list, make it a one-element list. */ | |
1721 | ||
1722 | void | |
a8fe7202 | 1723 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1724 | { |
1725 | Lisp_Object tortoise, hare; | |
1726 | ||
1727 | hare = tortoise = arg; | |
1728 | while (CONSP (hare)) | |
1729 | { | |
1730 | hare = XCDR (hare); | |
1731 | if (!CONSP (hare)) | |
1732 | break; | |
1733 | ||
1734 | hare = XCDR (hare); | |
1735 | tortoise = XCDR (tortoise); | |
1736 | ||
1737 | if (EQ (hare, tortoise)) | |
1738 | break; | |
1739 | } | |
1740 | ||
1741 | if (!NILP (hare)) | |
1742 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1743 | ||
1744 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1745 | } | |
1746 | ||
1747 | ||
e0f24100 | 1748 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1749 | a list containing one of CONDITIONS. */ |
1750 | ||
1751 | static int | |
d3da34e0 | 1752 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1753 | { |
4de86b16 | 1754 | if (NILP (list)) |
128c0f66 RM |
1755 | return 0; |
1756 | if (! CONSP (list)) | |
1757 | return 1; | |
1758 | ||
ab67260b | 1759 | while (CONSP (conditions)) |
128c0f66 | 1760 | { |
ab67260b | 1761 | Lisp_Object this, tail; |
03699b14 KR |
1762 | this = XCAR (conditions); |
1763 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1764 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1765 | return 1; |
03699b14 | 1766 | conditions = XCDR (conditions); |
128c0f66 | 1767 | } |
ab67260b | 1768 | return 0; |
128c0f66 RM |
1769 | } |
1770 | ||
fc950e09 KH |
1771 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1772 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1773 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1774 | |
1775 | static int | |
d3da34e0 | 1776 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1777 | { |
1778 | Lisp_Object tail; | |
1779 | int first_string = 1; | |
1780 | Lisp_Object error_message; | |
1781 | ||
17401c97 GM |
1782 | error_message = Qnil; |
1783 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1784 | { |
03699b14 | 1785 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1786 | { |
1787 | if (first_string) | |
1788 | { | |
1789 | error_message = Ferror_message_string (data); | |
1790 | first_string = 0; | |
1791 | } | |
177c0ea7 | 1792 | |
03699b14 | 1793 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1794 | return 1; |
1795 | } | |
1796 | else | |
1797 | { | |
1798 | Lisp_Object contail; | |
1799 | ||
17401c97 | 1800 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1801 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1802 | return 1; |
1803 | } | |
1804 | } | |
1805 | ||
1806 | return 0; | |
1807 | } | |
1808 | ||
ddaa36e1 AS |
1809 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
1810 | SIG and DATA describe the signal, as in find_handler_clause. */ | |
1811 | ||
1812 | static int | |
d3da34e0 | 1813 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1814 | { |
1815 | Lisp_Object combined_data; | |
1816 | ||
1817 | combined_data = Fcons (sig, data); | |
1818 | ||
1819 | if ( | |
1820 | /* Don't try to run the debugger with interrupts blocked. | |
1821 | The editing loop would return anyway. */ | |
1822 | ! INPUT_BLOCKED_P | |
1823 | /* Does user want to enter debugger for this kind of error? */ | |
1824 | && (EQ (sig, Qquit) | |
1825 | ? debug_on_quit | |
1826 | : wants_debugger (Vdebug_on_error, conditions)) | |
1827 | && ! skip_debugger (conditions, combined_data) | |
1828 | /* rms: what's this for? */ | |
1829 | && when_entered_debugger < num_nonmacro_input_events) | |
1830 | { | |
1831 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1832 | return 1; | |
1833 | } | |
1834 | ||
1835 | return 0; | |
1836 | } | |
1837 | ||
128c0f66 | 1838 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1839 | There are two ways to pass SIG and DATA: |
9b942ebd | 1840 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1841 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1842 | This is for memory-full errors only. |
1ea9dec4 | 1843 | |
9f5903bb RS |
1844 | We need to increase max_specpdl_size temporarily around |
1845 | anything we do that can push on the specpdl, so as not to get | |
1846 | a second error here in case we're handling specpdl overflow. */ | |
db9f0278 JB |
1847 | |
1848 | static Lisp_Object | |
d3da34e0 JB |
1849 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions, |
1850 | Lisp_Object sig, Lisp_Object data) | |
db9f0278 JB |
1851 | { |
1852 | register Lisp_Object h; | |
1853 | register Lisp_Object tem; | |
f01cbfdd RS |
1854 | int debugger_called = 0; |
1855 | int debugger_considered = 0; | |
db9f0278 | 1856 | |
f01cbfdd RS |
1857 | /* t is used by handlers for all conditions, set up by C code. */ |
1858 | if (EQ (handlers, Qt)) | |
db9f0278 | 1859 | return Qt; |
f01cbfdd RS |
1860 | |
1861 | /* Don't run the debugger for a memory-full error. | |
1862 | (There is no room in memory to do that!) */ | |
1863 | if (NILP (sig)) | |
1864 | debugger_considered = 1; | |
1865 | ||
61ede770 RS |
1866 | /* error is used similarly, but means print an error message |
1867 | and run the debugger if that is enabled. */ | |
1868 | if (EQ (handlers, Qerror) | |
57a6e758 RS |
1869 | || !NILP (Vdebug_on_signal)) /* This says call debugger even if |
1870 | there is a handler. */ | |
db9f0278 | 1871 | { |
f01cbfdd | 1872 | if (!NILP (sig) && wants_debugger (Vstack_trace_on_error, conditions)) |
88817f3b | 1873 | { |
48ce8ca7 | 1874 | max_lisp_eval_depth += 15; |
9f5903bb | 1875 | max_specpdl_size++; |
5b650faa SM |
1876 | if (noninteractive) |
1877 | Fbacktrace (); | |
1878 | else | |
1879 | internal_with_output_to_temp_buffer | |
1880 | ("*Backtrace*", | |
1881 | (Lisp_Object (*) (Lisp_Object)) Fbacktrace, | |
1882 | Qnil); | |
9f5903bb | 1883 | max_specpdl_size--; |
48ce8ca7 | 1884 | max_lisp_eval_depth -= 15; |
88817f3b | 1885 | } |
f01cbfdd RS |
1886 | |
1887 | if (!debugger_considered) | |
db9f0278 | 1888 | { |
f01cbfdd RS |
1889 | debugger_considered = 1; |
1890 | debugger_called = maybe_call_debugger (conditions, sig, data); | |
61ede770 | 1891 | } |
f01cbfdd | 1892 | |
61ede770 RS |
1893 | /* If there is no handler, return saying whether we ran the debugger. */ |
1894 | if (EQ (handlers, Qerror)) | |
1895 | { | |
1896 | if (debugger_called) | |
9f5903bb | 1897 | return Qlambda; |
61ede770 | 1898 | return Qt; |
db9f0278 | 1899 | } |
db9f0278 | 1900 | } |
f01cbfdd | 1901 | |
db9f0278 JB |
1902 | for (h = handlers; CONSP (h); h = Fcdr (h)) |
1903 | { | |
5f96776a RS |
1904 | Lisp_Object handler, condit; |
1905 | ||
1906 | handler = Fcar (h); | |
1907 | if (!CONSP (handler)) | |
db9f0278 | 1908 | continue; |
5f96776a RS |
1909 | condit = Fcar (handler); |
1910 | /* Handle a single condition name in handler HANDLER. */ | |
1911 | if (SYMBOLP (condit)) | |
1912 | { | |
1913 | tem = Fmemq (Fcar (handler), conditions); | |
1914 | if (!NILP (tem)) | |
1915 | return handler; | |
1916 | } | |
1917 | /* Handle a list of condition names in handler HANDLER. */ | |
1918 | else if (CONSP (condit)) | |
1919 | { | |
f01cbfdd RS |
1920 | Lisp_Object tail; |
1921 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1922 | { |
f01cbfdd | 1923 | tem = Fmemq (Fcar (tail), conditions); |
5f96776a | 1924 | if (!NILP (tem)) |
f01cbfdd RS |
1925 | { |
1926 | /* This handler is going to apply. | |
1927 | Does it allow the debugger to run first? */ | |
1928 | if (! debugger_considered && !NILP (Fmemq (Qdebug, condit))) | |
1929 | maybe_call_debugger (conditions, sig, data); | |
1930 | return handler; | |
1931 | } | |
5f96776a RS |
1932 | } |
1933 | } | |
db9f0278 | 1934 | } |
f01cbfdd | 1935 | |
db9f0278 JB |
1936 | return Qnil; |
1937 | } | |
1938 | ||
db9f0278 | 1939 | |
b3ffc17c | 1940 | /* dump an error message; called like vprintf */ |
db9f0278 | 1941 | void |
b3ffc17c | 1942 | verror (const char *m, va_list ap) |
db9f0278 JB |
1943 | { |
1944 | char buf[200]; | |
5816888b | 1945 | EMACS_INT size = 200; |
9125da08 RS |
1946 | int mlen; |
1947 | char *buffer = buf; | |
1948 | char *args[3]; | |
1949 | int allocated = 0; | |
1950 | Lisp_Object string; | |
1951 | ||
9125da08 | 1952 | mlen = strlen (m); |
db9f0278 JB |
1953 | |
1954 | while (1) | |
9125da08 | 1955 | { |
db063399 | 1956 | EMACS_INT used; |
6a8033e1 | 1957 | used = doprnt (buffer, size, m, m + mlen, ap); |
9125da08 RS |
1958 | if (used < size) |
1959 | break; | |
1960 | size *= 2; | |
1961 | if (allocated) | |
1962 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
1963 | else |
1964 | { | |
1965 | buffer = (char *) xmalloc (size); | |
1966 | allocated = 1; | |
1967 | } | |
9125da08 RS |
1968 | } |
1969 | ||
955f3ff9 | 1970 | string = build_string (buffer); |
9125da08 | 1971 | if (allocated) |
9ae6734f | 1972 | xfree (buffer); |
9125da08 | 1973 | |
734d55a2 | 1974 | xsignal1 (Qerror, string); |
db9f0278 | 1975 | } |
b3ffc17c DN |
1976 | |
1977 | ||
1978 | /* dump an error message; called like printf */ | |
1979 | ||
1980 | /* VARARGS 1 */ | |
1981 | void | |
1982 | error (const char *m, ...) | |
1983 | { | |
1984 | va_list ap; | |
1985 | va_start (ap, m); | |
1986 | verror (m, ap); | |
1987 | va_end (ap); | |
1988 | } | |
db9f0278 | 1989 | \f |
e72706be | 1990 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
1991 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
1992 | This means it contains a description for how to read arguments to give it. | |
1993 | The value is nil for an invalid function or a symbol with no function | |
1994 | definition. | |
1995 | ||
1996 | Interactively callable functions include strings and vectors (treated | |
1997 | as keyboard macros), lambda-expressions that contain a top-level call | |
1998 | to `interactive', autoload definitions made by `autoload' with non-nil | |
1999 | fourth argument, and some of the built-in functions of Lisp. | |
2000 | ||
e72706be RS |
2001 | Also, a symbol satisfies `commandp' if its function definition does so. |
2002 | ||
2003 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2004 | then strings and vectors are not accepted. */) |
5842a27b | 2005 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
2006 | { |
2007 | register Lisp_Object fun; | |
2008 | register Lisp_Object funcar; | |
52b71f49 | 2009 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2010 | |
2011 | fun = function; | |
2012 | ||
52b71f49 SM |
2013 | fun = indirect_function (fun); /* Check cycles. */ |
2014 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2015 | return Qnil; |
db9f0278 | 2016 | |
52b71f49 SM |
2017 | /* Check an `interactive-form' property if present, analogous to the |
2018 | function-documentation property. */ | |
2019 | fun = function; | |
2020 | while (SYMBOLP (fun)) | |
2021 | { | |
2b9aa051 | 2022 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
2023 | if (!NILP (tmp)) |
2024 | if_prop = Qt; | |
2025 | fun = Fsymbol_function (fun); | |
2026 | } | |
2027 | ||
db9f0278 JB |
2028 | /* Emacs primitives are interactive if their DEFUN specifies an |
2029 | interactive spec. */ | |
90165123 | 2030 | if (SUBRP (fun)) |
04724b69 | 2031 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2032 | |
2033 | /* Bytecode objects are interactive if they are long enough to | |
2034 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2035 | where the interactive spec is stored. */ | |
90165123 | 2036 | else if (COMPILEDP (fun)) |
845975f5 | 2037 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2038 | ? Qt : if_prop); |
db9f0278 JB |
2039 | |
2040 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2041 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2042 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2043 | |
2044 | /* Lists may represent commands. */ | |
2045 | if (!CONSP (fun)) | |
2046 | return Qnil; | |
ed16fb98 | 2047 | funcar = XCAR (fun); |
db9f0278 | 2048 | if (EQ (funcar, Qlambda)) |
52b71f49 | 2049 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
db9f0278 | 2050 | if (EQ (funcar, Qautoload)) |
52b71f49 | 2051 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2052 | else |
2053 | return Qnil; | |
2054 | } | |
2055 | ||
db9f0278 | 2056 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
2057 | doc: /* Define FUNCTION to autoload from FILE. |
2058 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2059 | Third arg DOCSTRING is documentation for the function. | |
2060 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2061 | Fifth arg TYPE indicates the type of the object: | |
2062 | nil or omitted says FUNCTION is a function, | |
2063 | `keymap' says FUNCTION is really a keymap, and | |
2064 | `macro' or t says FUNCTION is really a macro. | |
2065 | Third through fifth args give info about the real definition. | |
2066 | They default to nil. | |
2067 | If FUNCTION is already defined other than as an autoload, | |
2068 | this does nothing and returns nil. */) | |
5842a27b | 2069 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 2070 | { |
b7826503 PJ |
2071 | CHECK_SYMBOL (function); |
2072 | CHECK_STRING (file); | |
db9f0278 JB |
2073 | |
2074 | /* If function is defined and not as an autoload, don't override */ | |
2075 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 2076 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2077 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2078 | return Qnil; |
2079 | ||
7973e637 SM |
2080 | if (NILP (Vpurify_flag)) |
2081 | /* Only add entries after dumping, because the ones before are | |
2082 | not useful and else we get loads of them from the loaddefs.el. */ | |
2083 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
905a9ed3 | 2084 | else |
a56eaaef | 2085 | /* We don't want the docstring in purespace (instead, |
d6d23852 SM |
2086 | Snarf-documentation should (hopefully) overwrite it). |
2087 | We used to use 0 here, but that leads to accidental sharing in | |
2088 | purecopy's hash-consing, so we use a (hopefully) unique integer | |
2089 | instead. */ | |
2090 | docstring = make_number (XHASH (function)); | |
a56eaaef DN |
2091 | return Ffset (function, |
2092 | Fpurecopy (list5 (Qautoload, file, docstring, | |
2093 | interactive, type))); | |
db9f0278 JB |
2094 | } |
2095 | ||
2096 | Lisp_Object | |
d3da34e0 | 2097 | un_autoload (Lisp_Object oldqueue) |
db9f0278 JB |
2098 | { |
2099 | register Lisp_Object queue, first, second; | |
2100 | ||
2101 | /* Queue to unwind is current value of Vautoload_queue. | |
2102 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2103 | queue = Vautoload_queue; | |
2104 | Vautoload_queue = oldqueue; | |
2105 | while (CONSP (queue)) | |
2106 | { | |
e509f168 | 2107 | first = XCAR (queue); |
db9f0278 JB |
2108 | second = Fcdr (first); |
2109 | first = Fcar (first); | |
47b82df9 RS |
2110 | if (EQ (first, make_number (0))) |
2111 | Vfeatures = second; | |
db9f0278 JB |
2112 | else |
2113 | Ffset (first, second); | |
e509f168 | 2114 | queue = XCDR (queue); |
db9f0278 JB |
2115 | } |
2116 | return Qnil; | |
2117 | } | |
2118 | ||
ca20916b RS |
2119 | /* Load an autoloaded function. |
2120 | FUNNAME is the symbol which is the function's name. | |
2121 | FUNDEF is the autoload definition (a list). */ | |
2122 | ||
045ba794 | 2123 | void |
d3da34e0 | 2124 | do_autoload (Lisp_Object fundef, Lisp_Object funname) |
db9f0278 | 2125 | { |
aed13378 | 2126 | int count = SPECPDL_INDEX (); |
d945992e | 2127 | Lisp_Object fun; |
ca20916b | 2128 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2129 | |
aea6173f RS |
2130 | /* This is to make sure that loadup.el gives a clear picture |
2131 | of what files are preloaded and when. */ | |
ab4db096 RS |
2132 | if (! NILP (Vpurify_flag)) |
2133 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2134 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2135 | |
db9f0278 | 2136 | fun = funname; |
b7826503 | 2137 | CHECK_SYMBOL (funname); |
ca20916b | 2138 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2139 | |
f87740dc | 2140 | /* Preserve the match data. */ |
89f2614d | 2141 | record_unwind_save_match_data (); |
177c0ea7 | 2142 | |
a04ee161 RS |
2143 | /* If autoloading gets an error (which includes the error of failing |
2144 | to define the function being called), we use Vautoload_queue | |
2145 | to undo function definitions and `provide' calls made by | |
2146 | the function. We do this in the specific case of autoloading | |
2147 | because autoloading is not an explicit request "load this file", | |
2148 | but rather a request to "call this function". | |
d3da34e0 | 2149 | |
a04ee161 | 2150 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
2151 | record_unwind_protect (un_autoload, Vautoload_queue); |
2152 | Vautoload_queue = Qt; | |
7351b242 | 2153 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2154 | |
db9f0278 JB |
2155 | /* Once loading finishes, don't undo it. */ |
2156 | Vautoload_queue = Qt; | |
2157 | unbind_to (count, Qnil); | |
2158 | ||
a7f96a35 | 2159 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2160 | |
76c2b0cc | 2161 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2162 | error ("Autoloading failed to define function %s", |
d5db4077 | 2163 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2164 | UNGCPRO; |
db9f0278 | 2165 | } |
4c576a83 | 2166 | |
db9f0278 JB |
2167 | \f |
2168 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
9dbc9081 | 2169 | doc: /* Evaluate FORM and return its value. */) |
5842a27b | 2170 | (Lisp_Object form) |
db9f0278 JB |
2171 | { |
2172 | Lisp_Object fun, val, original_fun, original_args; | |
2173 | Lisp_Object funcar; | |
2174 | struct backtrace backtrace; | |
2175 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2176 | ||
df470e3b | 2177 | if (handling_signal) |
48f8dfa3 | 2178 | abort (); |
177c0ea7 | 2179 | |
90165123 | 2180 | if (SYMBOLP (form)) |
2b9bde76 | 2181 | return Fsymbol_value (form); |
db9f0278 JB |
2182 | if (!CONSP (form)) |
2183 | return form; | |
2184 | ||
2185 | QUIT; | |
ee830945 RS |
2186 | if ((consing_since_gc > gc_cons_threshold |
2187 | && consing_since_gc > gc_relative_threshold) | |
2188 | || | |
2189 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2190 | { |
2191 | GCPRO1 (form); | |
2192 | Fgarbage_collect (); | |
2193 | UNGCPRO; | |
2194 | } | |
2195 | ||
2196 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2197 | { | |
2198 | if (max_lisp_eval_depth < 100) | |
2199 | max_lisp_eval_depth = 100; | |
2200 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2201 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2202 | } |
2203 | ||
2204 | original_fun = Fcar (form); | |
2205 | original_args = Fcdr (form); | |
2206 | ||
2207 | backtrace.next = backtrace_list; | |
2208 | backtrace_list = &backtrace; | |
2209 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
2210 | backtrace.args = &original_args; | |
2211 | backtrace.nargs = UNEVALLED; | |
2212 | backtrace.evalargs = 1; | |
2213 | backtrace.debug_on_exit = 0; | |
2214 | ||
2215 | if (debug_on_next_call) | |
2216 | do_debug_on_call (Qt); | |
2217 | ||
2218 | /* At this point, only original_fun and original_args | |
2219 | have values that will be used below */ | |
2220 | retry: | |
8788120f KS |
2221 | |
2222 | /* Optimize for no indirection. */ | |
2223 | fun = original_fun; | |
2224 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2225 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2226 | fun = indirect_function (fun); | |
db9f0278 | 2227 | |
90165123 | 2228 | if (SUBRP (fun)) |
db9f0278 JB |
2229 | { |
2230 | Lisp_Object numargs; | |
166c822d | 2231 | Lisp_Object argvals[8]; |
db9f0278 JB |
2232 | Lisp_Object args_left; |
2233 | register int i, maxargs; | |
2234 | ||
2235 | args_left = original_args; | |
2236 | numargs = Flength (args_left); | |
2237 | ||
c1788fbc RS |
2238 | CHECK_CONS_LIST (); |
2239 | ||
db9f0278 JB |
2240 | if (XINT (numargs) < XSUBR (fun)->min_args || |
2241 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2242 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2243 | |
ef1b0ba7 | 2244 | else if (XSUBR (fun)->max_args == UNEVALLED) |
db9f0278 JB |
2245 | { |
2246 | backtrace.evalargs = 0; | |
d5273788 | 2247 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
db9f0278 | 2248 | } |
ef1b0ba7 | 2249 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 JB |
2250 | { |
2251 | /* Pass a vector of evaluated arguments */ | |
2252 | Lisp_Object *vals; | |
2253 | register int argnum = 0; | |
3a7a9129 | 2254 | USE_SAFE_ALLOCA; |
db9f0278 | 2255 | |
b72e0717 | 2256 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2257 | |
2258 | GCPRO3 (args_left, fun, fun); | |
2259 | gcpro3.var = vals; | |
2260 | gcpro3.nvars = 0; | |
2261 | ||
265a9e55 | 2262 | while (!NILP (args_left)) |
db9f0278 JB |
2263 | { |
2264 | vals[argnum++] = Feval (Fcar (args_left)); | |
2265 | args_left = Fcdr (args_left); | |
2266 | gcpro3.nvars = argnum; | |
2267 | } | |
db9f0278 JB |
2268 | |
2269 | backtrace.args = vals; | |
2270 | backtrace.nargs = XINT (numargs); | |
2271 | ||
d5273788 | 2272 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2273 | UNGCPRO; |
3a7a9129 | 2274 | SAFE_FREE (); |
db9f0278 | 2275 | } |
ef1b0ba7 | 2276 | else |
db9f0278 | 2277 | { |
ef1b0ba7 SM |
2278 | GCPRO3 (args_left, fun, fun); |
2279 | gcpro3.var = argvals; | |
2280 | gcpro3.nvars = 0; | |
db9f0278 | 2281 | |
ef1b0ba7 SM |
2282 | maxargs = XSUBR (fun)->max_args; |
2283 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2284 | { | |
2285 | argvals[i] = Feval (Fcar (args_left)); | |
2286 | gcpro3.nvars = ++i; | |
2287 | } | |
db9f0278 | 2288 | |
ef1b0ba7 | 2289 | UNGCPRO; |
db9f0278 | 2290 | |
ef1b0ba7 SM |
2291 | backtrace.args = argvals; |
2292 | backtrace.nargs = XINT (numargs); | |
2293 | ||
2294 | switch (i) | |
2295 | { | |
2296 | case 0: | |
2297 | val = (XSUBR (fun)->function.a0 ()); | |
2298 | break; | |
2299 | case 1: | |
2300 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2301 | break; | |
2302 | case 2: | |
2303 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2304 | break; | |
2305 | case 3: | |
2306 | val = (XSUBR (fun)->function.a3 | |
2307 | (argvals[0], argvals[1], argvals[2])); | |
2308 | break; | |
2309 | case 4: | |
2310 | val = (XSUBR (fun)->function.a4 | |
2311 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2312 | break; | |
2313 | case 5: | |
2314 | val = (XSUBR (fun)->function.a5 | |
2315 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2316 | argvals[4])); | |
2317 | break; | |
2318 | case 6: | |
2319 | val = (XSUBR (fun)->function.a6 | |
2320 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2321 | argvals[4], argvals[5])); | |
2322 | break; | |
2323 | case 7: | |
2324 | val = (XSUBR (fun)->function.a7 | |
2325 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2326 | argvals[4], argvals[5], argvals[6])); | |
2327 | break; | |
2328 | ||
2329 | case 8: | |
2330 | val = (XSUBR (fun)->function.a8 | |
2331 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2332 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2333 | break; | |
2334 | ||
2335 | default: | |
2336 | /* Someone has created a subr that takes more arguments than | |
2337 | is supported by this code. We need to either rewrite the | |
2338 | subr to use a different argument protocol, or add more | |
2339 | cases to this switch. */ | |
2340 | abort (); | |
2341 | } | |
db9f0278 JB |
2342 | } |
2343 | } | |
ef1b0ba7 | 2344 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2345 | val = apply_lambda (fun, original_args, 1); |
2346 | else | |
2347 | { | |
8788120f | 2348 | if (EQ (fun, Qunbound)) |
734d55a2 | 2349 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2350 | if (!CONSP (fun)) |
734d55a2 KS |
2351 | xsignal1 (Qinvalid_function, original_fun); |
2352 | funcar = XCAR (fun); | |
90165123 | 2353 | if (!SYMBOLP (funcar)) |
734d55a2 | 2354 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2355 | if (EQ (funcar, Qautoload)) |
2356 | { | |
2357 | do_autoload (fun, original_fun); | |
2358 | goto retry; | |
2359 | } | |
2360 | if (EQ (funcar, Qmacro)) | |
2361 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
2362 | else if (EQ (funcar, Qlambda)) | |
2363 | val = apply_lambda (fun, original_args, 1); | |
db9f0278 | 2364 | else |
734d55a2 | 2365 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2366 | } |
c1788fbc RS |
2367 | CHECK_CONS_LIST (); |
2368 | ||
db9f0278 JB |
2369 | lisp_eval_depth--; |
2370 | if (backtrace.debug_on_exit) | |
2371 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2372 | backtrace_list = backtrace.next; | |
824eb35e | 2373 | |
db9f0278 JB |
2374 | return val; |
2375 | } | |
2376 | \f | |
2377 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
9dbc9081 PJ |
2378 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2379 | Then return the value FUNCTION returns. | |
2380 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2381 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
5842a27b | 2382 | (int nargs, Lisp_Object *args) |
db9f0278 JB |
2383 | { |
2384 | register int i, numargs; | |
2385 | register Lisp_Object spread_arg; | |
2386 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2387 | Lisp_Object fun, retval; |
96d44c64 | 2388 | struct gcpro gcpro1; |
3a7a9129 | 2389 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2390 | |
2391 | fun = args [0]; | |
2392 | funcall_args = 0; | |
2393 | spread_arg = args [nargs - 1]; | |
b7826503 | 2394 | CHECK_LIST (spread_arg); |
177c0ea7 | 2395 | |
db9f0278 JB |
2396 | numargs = XINT (Flength (spread_arg)); |
2397 | ||
2398 | if (numargs == 0) | |
2399 | return Ffuncall (nargs - 1, args); | |
2400 | else if (numargs == 1) | |
2401 | { | |
03699b14 | 2402 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2403 | return Ffuncall (nargs, args); |
2404 | } | |
2405 | ||
a6e3fa71 | 2406 | numargs += nargs - 2; |
db9f0278 | 2407 | |
8788120f KS |
2408 | /* Optimize for no indirection. */ |
2409 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2410 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2411 | fun = indirect_function (fun); | |
ffd56f97 | 2412 | if (EQ (fun, Qunbound)) |
db9f0278 | 2413 | { |
ffd56f97 JB |
2414 | /* Let funcall get the error */ |
2415 | fun = args[0]; | |
2416 | goto funcall; | |
db9f0278 JB |
2417 | } |
2418 | ||
90165123 | 2419 | if (SUBRP (fun)) |
db9f0278 JB |
2420 | { |
2421 | if (numargs < XSUBR (fun)->min_args | |
2422 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2423 | goto funcall; /* Let funcall get the error */ | |
2424 | else if (XSUBR (fun)->max_args > numargs) | |
2425 | { | |
2426 | /* Avoid making funcall cons up a yet another new vector of arguments | |
2427 | by explicitly supplying nil's for optional values */ | |
b72e0717 | 2428 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2429 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2430 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2431 | GCPRO1 (*funcall_args); |
2432 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2433 | } |
2434 | } | |
2435 | funcall: | |
2436 | /* We add 1 to numargs because funcall_args includes the | |
2437 | function itself as well as its arguments. */ | |
2438 | if (!funcall_args) | |
a6e3fa71 | 2439 | { |
b72e0717 | 2440 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2441 | GCPRO1 (*funcall_args); |
2442 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2443 | } |
2444 | ||
72af86bd | 2445 | memcpy (funcall_args, args, nargs * sizeof (Lisp_Object)); |
db9f0278 JB |
2446 | /* Spread the last arg we got. Its first element goes in |
2447 | the slot that it used to occupy, hence this value of I. */ | |
2448 | i = nargs - 1; | |
265a9e55 | 2449 | while (!NILP (spread_arg)) |
db9f0278 | 2450 | { |
03699b14 KR |
2451 | funcall_args [i++] = XCAR (spread_arg); |
2452 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2453 | } |
a6e3fa71 | 2454 | |
96d44c64 | 2455 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2456 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2457 | UNGCPRO; | |
2458 | SAFE_FREE (); | |
2459 | ||
2460 | return retval; | |
db9f0278 JB |
2461 | } |
2462 | \f | |
ff936e53 SM |
2463 | /* Run hook variables in various ways. */ |
2464 | ||
2465 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
f57e2426 | 2466 | static Lisp_Object run_hook_with_args (int, Lisp_Object *, |
bb8e180f | 2467 | enum run_hooks_condition); |
ff936e53 | 2468 | |
8b5176cd | 2469 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2470 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2471 | Each argument should be a symbol, a hook variable. |
2472 | These symbols are processed in the order specified. | |
2473 | If a hook symbol has a non-nil value, that value may be a function | |
2474 | or a list of functions to be called to run the hook. | |
2475 | If the value is a function, it is called with no arguments. | |
2476 | If it is a list, the elements are called, in order, with no arguments. | |
2477 | ||
9f685258 LK |
2478 | Major modes should not use this function directly to run their mode |
2479 | hook; they should use `run-mode-hooks' instead. | |
2480 | ||
72e85d5d RS |
2481 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2482 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2483 | usage: (run-hooks &rest HOOKS) */) |
5842a27b | 2484 | (int nargs, Lisp_Object *args) |
ff936e53 SM |
2485 | { |
2486 | Lisp_Object hook[1]; | |
2487 | register int i; | |
2488 | ||
2489 | for (i = 0; i < nargs; i++) | |
2490 | { | |
2491 | hook[0] = args[i]; | |
2492 | run_hook_with_args (1, hook, to_completion); | |
2493 | } | |
2494 | ||
2495 | return Qnil; | |
2496 | } | |
177c0ea7 | 2497 | |
a0d76c27 | 2498 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2499 | Srun_hook_with_args, 1, MANY, 0, |
2500 | doc: /* Run HOOK with the specified arguments ARGS. | |
2501 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2502 | value, that value may be a function or a list of functions to be | |
2503 | called to run the hook. If the value is a function, it is called with | |
2504 | the given arguments and its return value is returned. If it is a list | |
2505 | of functions, those functions are called, in order, | |
2506 | with the given arguments ARGS. | |
d5e2c90c | 2507 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2508 | as that may change. |
2509 | ||
72e85d5d RS |
2510 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2511 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2512 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
5842a27b | 2513 | (int nargs, Lisp_Object *args) |
ff936e53 SM |
2514 | { |
2515 | return run_hook_with_args (nargs, args, to_completion); | |
2516 | } | |
2517 | ||
a0d76c27 | 2518 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2519 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2520 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2521 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2522 | value, that value may be a function or a list of functions to be | |
2523 | called to run the hook. If the value is a function, it is called with | |
2524 | the given arguments and its return value is returned. | |
2525 | If it is a list of functions, those functions are called, in order, | |
2526 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2527 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2528 | However, if they all return nil, we return nil. |
9dbc9081 | 2529 | |
72e85d5d RS |
2530 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2531 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2532 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
5842a27b | 2533 | (int nargs, Lisp_Object *args) |
b0b667cb | 2534 | { |
ff936e53 SM |
2535 | return run_hook_with_args (nargs, args, until_success); |
2536 | } | |
2537 | ||
a0d76c27 | 2538 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2539 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2540 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2541 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2542 | value, that value may be a function or a list of functions to be | |
2543 | called to run the hook. If the value is a function, it is called with | |
2544 | the given arguments and its return value is returned. | |
2545 | If it is a list of functions, those functions are called, in order, | |
2546 | with the given arguments ARGS, until one of them returns nil. | |
2547 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2548 | |
72e85d5d RS |
2549 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2550 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2551 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
5842a27b | 2552 | (int nargs, Lisp_Object *args) |
ff936e53 SM |
2553 | { |
2554 | return run_hook_with_args (nargs, args, until_failure); | |
2555 | } | |
2556 | ||
c933ea05 RS |
2557 | /* ARGS[0] should be a hook symbol. |
2558 | Call each of the functions in the hook value, passing each of them | |
2559 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2560 | COND specifies a condition to test after each call | |
2561 | to decide whether to stop. | |
2562 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2563 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2564 | ||
2901f1d1 | 2565 | static Lisp_Object |
d3da34e0 | 2566 | run_hook_with_args (int nargs, Lisp_Object *args, enum run_hooks_condition cond) |
ff936e53 SM |
2567 | { |
2568 | Lisp_Object sym, val, ret; | |
fada05d6 | 2569 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2570 | |
f029ca5f RS |
2571 | /* If we are dying or still initializing, |
2572 | don't do anything--it would probably crash if we tried. */ | |
2573 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2574 | return Qnil; |
f029ca5f | 2575 | |
b0b667cb | 2576 | sym = args[0]; |
aa681b51 | 2577 | val = find_symbol_value (sym); |
ff936e53 SM |
2578 | ret = (cond == until_failure ? Qt : Qnil); |
2579 | ||
b0b667cb | 2580 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2581 | return ret; |
03699b14 | 2582 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2583 | { |
2584 | args[0] = val; | |
2585 | return Ffuncall (nargs, args); | |
2586 | } | |
2587 | else | |
2588 | { | |
8932b1c2 | 2589 | Lisp_Object globals = Qnil; |
fada05d6 | 2590 | GCPRO3 (sym, val, globals); |
cb9d21f8 | 2591 | |
ff936e53 SM |
2592 | for (; |
2593 | CONSP (val) && ((cond == to_completion) | |
2594 | || (cond == until_success ? NILP (ret) | |
2595 | : !NILP (ret))); | |
03699b14 | 2596 | val = XCDR (val)) |
b0b667cb | 2597 | { |
03699b14 | 2598 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2599 | { |
2600 | /* t indicates this hook has a local binding; | |
2601 | it means to run the global binding too. */ | |
8932b1c2 CY |
2602 | globals = Fdefault_value (sym); |
2603 | if (NILP (globals)) continue; | |
b0b667cb | 2604 | |
8932b1c2 | 2605 | if (!CONSP (globals) || EQ (XCAR (globals), Qlambda)) |
b0b667cb | 2606 | { |
8932b1c2 CY |
2607 | args[0] = globals; |
2608 | ret = Ffuncall (nargs, args); | |
2609 | } | |
2610 | else | |
2611 | { | |
2612 | for (; | |
2613 | CONSP (globals) && ((cond == to_completion) | |
2614 | || (cond == until_success ? NILP (ret) | |
2615 | : !NILP (ret))); | |
2616 | globals = XCDR (globals)) | |
2617 | { | |
2618 | args[0] = XCAR (globals); | |
2619 | /* In a global value, t should not occur. If it does, we | |
2620 | must ignore it to avoid an endless loop. */ | |
2621 | if (!EQ (args[0], Qt)) | |
2622 | ret = Ffuncall (nargs, args); | |
2623 | } | |
b0b667cb KH |
2624 | } |
2625 | } | |
2626 | else | |
2627 | { | |
03699b14 | 2628 | args[0] = XCAR (val); |
ff936e53 | 2629 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2630 | } |
2631 | } | |
cb9d21f8 RS |
2632 | |
2633 | UNGCPRO; | |
ff936e53 | 2634 | return ret; |
b0b667cb KH |
2635 | } |
2636 | } | |
c933ea05 | 2637 | |
7d48558f RS |
2638 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2639 | ||
2640 | void | |
d3da34e0 | 2641 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2642 | { |
2643 | Lisp_Object temp[3]; | |
2644 | temp[0] = hook; | |
2645 | temp[1] = arg1; | |
2646 | temp[2] = arg2; | |
2647 | ||
2648 | Frun_hook_with_args (3, temp); | |
2649 | } | |
ff936e53 | 2650 | \f |
db9f0278 JB |
2651 | /* Apply fn to arg */ |
2652 | Lisp_Object | |
d3da34e0 | 2653 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2654 | { |
a6e3fa71 JB |
2655 | struct gcpro gcpro1; |
2656 | ||
2657 | GCPRO1 (fn); | |
265a9e55 | 2658 | if (NILP (arg)) |
a6e3fa71 JB |
2659 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2660 | gcpro1.nvars = 2; | |
db9f0278 JB |
2661 | { |
2662 | Lisp_Object args[2]; | |
2663 | args[0] = fn; | |
2664 | args[1] = arg; | |
a6e3fa71 JB |
2665 | gcpro1.var = args; |
2666 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2667 | } |
db9f0278 JB |
2668 | } |
2669 | ||
2670 | /* Call function fn on no arguments */ | |
2671 | Lisp_Object | |
d3da34e0 | 2672 | call0 (Lisp_Object fn) |
db9f0278 | 2673 | { |
a6e3fa71 JB |
2674 | struct gcpro gcpro1; |
2675 | ||
2676 | GCPRO1 (fn); | |
2677 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2678 | } |
2679 | ||
15285f9f | 2680 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2681 | /* ARGSUSED */ |
2682 | Lisp_Object | |
d3da34e0 | 2683 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2684 | { |
a6e3fa71 | 2685 | struct gcpro gcpro1; |
177c0ea7 | 2686 | Lisp_Object args[2]; |
a6e3fa71 | 2687 | |
db9f0278 | 2688 | args[0] = fn; |
15285f9f | 2689 | args[1] = arg1; |
a6e3fa71 JB |
2690 | GCPRO1 (args[0]); |
2691 | gcpro1.nvars = 2; | |
2692 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2693 | } |
2694 | ||
15285f9f | 2695 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2696 | /* ARGSUSED */ |
2697 | Lisp_Object | |
d3da34e0 | 2698 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2699 | { |
a6e3fa71 | 2700 | struct gcpro gcpro1; |
db9f0278 JB |
2701 | Lisp_Object args[3]; |
2702 | args[0] = fn; | |
15285f9f RS |
2703 | args[1] = arg1; |
2704 | args[2] = arg2; | |
a6e3fa71 JB |
2705 | GCPRO1 (args[0]); |
2706 | gcpro1.nvars = 3; | |
2707 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2708 | } |
2709 | ||
15285f9f | 2710 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2711 | /* ARGSUSED */ |
2712 | Lisp_Object | |
d3da34e0 | 2713 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2714 | { |
a6e3fa71 | 2715 | struct gcpro gcpro1; |
db9f0278 JB |
2716 | Lisp_Object args[4]; |
2717 | args[0] = fn; | |
15285f9f RS |
2718 | args[1] = arg1; |
2719 | args[2] = arg2; | |
2720 | args[3] = arg3; | |
a6e3fa71 JB |
2721 | GCPRO1 (args[0]); |
2722 | gcpro1.nvars = 4; | |
2723 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2724 | } |
2725 | ||
15285f9f | 2726 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2727 | /* ARGSUSED */ |
2728 | Lisp_Object | |
d3da34e0 JB |
2729 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2730 | Lisp_Object arg4) | |
a5a44b91 JB |
2731 | { |
2732 | struct gcpro gcpro1; | |
a5a44b91 JB |
2733 | Lisp_Object args[5]; |
2734 | args[0] = fn; | |
15285f9f RS |
2735 | args[1] = arg1; |
2736 | args[2] = arg2; | |
2737 | args[3] = arg3; | |
2738 | args[4] = arg4; | |
a5a44b91 JB |
2739 | GCPRO1 (args[0]); |
2740 | gcpro1.nvars = 5; | |
2741 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2742 | } |
2743 | ||
15285f9f RS |
2744 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2745 | /* ARGSUSED */ | |
2746 | Lisp_Object | |
d3da34e0 JB |
2747 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2748 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2749 | { |
2750 | struct gcpro gcpro1; | |
15285f9f RS |
2751 | Lisp_Object args[6]; |
2752 | args[0] = fn; | |
2753 | args[1] = arg1; | |
2754 | args[2] = arg2; | |
2755 | args[3] = arg3; | |
2756 | args[4] = arg4; | |
2757 | args[5] = arg5; | |
2758 | GCPRO1 (args[0]); | |
2759 | gcpro1.nvars = 6; | |
2760 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2761 | } |
2762 | ||
2763 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2764 | /* ARGSUSED */ | |
2765 | Lisp_Object | |
d3da34e0 JB |
2766 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2767 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2768 | { |
2769 | struct gcpro gcpro1; | |
15285f9f RS |
2770 | Lisp_Object args[7]; |
2771 | args[0] = fn; | |
2772 | args[1] = arg1; | |
2773 | args[2] = arg2; | |
2774 | args[3] = arg3; | |
2775 | args[4] = arg4; | |
2776 | args[5] = arg5; | |
2777 | args[6] = arg6; | |
2778 | GCPRO1 (args[0]); | |
2779 | gcpro1.nvars = 7; | |
2780 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2781 | } |
2782 | ||
574c05e2 KK |
2783 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7 */ |
2784 | /* ARGSUSED */ | |
2785 | Lisp_Object | |
d3da34e0 JB |
2786 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2787 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2788 | { |
2789 | struct gcpro gcpro1; | |
574c05e2 KK |
2790 | Lisp_Object args[8]; |
2791 | args[0] = fn; | |
2792 | args[1] = arg1; | |
2793 | args[2] = arg2; | |
2794 | args[3] = arg3; | |
2795 | args[4] = arg4; | |
2796 | args[5] = arg5; | |
2797 | args[6] = arg6; | |
2798 | args[7] = arg7; | |
2799 | GCPRO1 (args[0]); | |
2800 | gcpro1.nvars = 8; | |
2801 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2802 | } |
2803 | ||
6c2ef893 RS |
2804 | /* The caller should GCPRO all the elements of ARGS. */ |
2805 | ||
db9f0278 | 2806 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2807 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2808 | Return the value that function returns. | |
2809 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2810 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
5842a27b | 2811 | (int nargs, Lisp_Object *args) |
db9f0278 | 2812 | { |
8788120f | 2813 | Lisp_Object fun, original_fun; |
db9f0278 JB |
2814 | Lisp_Object funcar; |
2815 | int numargs = nargs - 1; | |
2816 | Lisp_Object lisp_numargs; | |
2817 | Lisp_Object val; | |
2818 | struct backtrace backtrace; | |
2819 | register Lisp_Object *internal_args; | |
2820 | register int i; | |
2821 | ||
2822 | QUIT; | |
ee830945 RS |
2823 | if ((consing_since_gc > gc_cons_threshold |
2824 | && consing_since_gc > gc_relative_threshold) | |
2825 | || | |
2826 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 2827 | Fgarbage_collect (); |
db9f0278 JB |
2828 | |
2829 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2830 | { | |
2831 | if (max_lisp_eval_depth < 100) | |
2832 | max_lisp_eval_depth = 100; | |
2833 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2834 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2835 | } |
2836 | ||
2837 | backtrace.next = backtrace_list; | |
2838 | backtrace_list = &backtrace; | |
2839 | backtrace.function = &args[0]; | |
2840 | backtrace.args = &args[1]; | |
2841 | backtrace.nargs = nargs - 1; | |
2842 | backtrace.evalargs = 0; | |
2843 | backtrace.debug_on_exit = 0; | |
2844 | ||
2845 | if (debug_on_next_call) | |
2846 | do_debug_on_call (Qlambda); | |
2847 | ||
fff3ff9c KS |
2848 | CHECK_CONS_LIST (); |
2849 | ||
8788120f KS |
2850 | original_fun = args[0]; |
2851 | ||
db9f0278 JB |
2852 | retry: |
2853 | ||
8788120f KS |
2854 | /* Optimize for no indirection. */ |
2855 | fun = original_fun; | |
2856 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2857 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2858 | fun = indirect_function (fun); | |
db9f0278 | 2859 | |
90165123 | 2860 | if (SUBRP (fun)) |
db9f0278 | 2861 | { |
ef1b0ba7 | 2862 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
2863 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
2864 | { | |
a631e24c | 2865 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 2866 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
2867 | } |
2868 | ||
ef1b0ba7 | 2869 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 2870 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2871 | |
ef1b0ba7 SM |
2872 | else if (XSUBR (fun)->max_args == MANY) |
2873 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 2874 | else |
db9f0278 | 2875 | { |
ef1b0ba7 SM |
2876 | if (XSUBR (fun)->max_args > numargs) |
2877 | { | |
2878 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
2879 | memcpy (internal_args, args + 1, numargs * sizeof (Lisp_Object)); | |
2880 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
2881 | internal_args[i] = Qnil; | |
2882 | } | |
2883 | else | |
2884 | internal_args = args + 1; | |
2885 | switch (XSUBR (fun)->max_args) | |
2886 | { | |
2887 | case 0: | |
2888 | val = (XSUBR (fun)->function.a0 ()); | |
2889 | break; | |
2890 | case 1: | |
2891 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
2892 | break; | |
2893 | case 2: | |
2894 | val = (XSUBR (fun)->function.a2 | |
2895 | (internal_args[0], internal_args[1])); | |
2896 | break; | |
2897 | case 3: | |
2898 | val = (XSUBR (fun)->function.a3 | |
2899 | (internal_args[0], internal_args[1], internal_args[2])); | |
2900 | break; | |
2901 | case 4: | |
2902 | val = (XSUBR (fun)->function.a4 | |
2903 | (internal_args[0], internal_args[1], internal_args[2], | |
2904 | internal_args[3])); | |
2905 | break; | |
2906 | case 5: | |
2907 | val = (XSUBR (fun)->function.a5 | |
2908 | (internal_args[0], internal_args[1], internal_args[2], | |
2909 | internal_args[3], internal_args[4])); | |
2910 | break; | |
2911 | case 6: | |
2912 | val = (XSUBR (fun)->function.a6 | |
2913 | (internal_args[0], internal_args[1], internal_args[2], | |
2914 | internal_args[3], internal_args[4], internal_args[5])); | |
2915 | break; | |
2916 | case 7: | |
2917 | val = (XSUBR (fun)->function.a7 | |
2918 | (internal_args[0], internal_args[1], internal_args[2], | |
2919 | internal_args[3], internal_args[4], internal_args[5], | |
2920 | internal_args[6])); | |
2921 | break; | |
2922 | ||
2923 | case 8: | |
2924 | val = (XSUBR (fun)->function.a8 | |
2925 | (internal_args[0], internal_args[1], internal_args[2], | |
2926 | internal_args[3], internal_args[4], internal_args[5], | |
2927 | internal_args[6], internal_args[7])); | |
2928 | break; | |
2929 | ||
2930 | default: | |
2931 | ||
2932 | /* If a subr takes more than 8 arguments without using MANY | |
2933 | or UNEVALLED, we need to extend this function to support it. | |
2934 | Until this is done, there is no way to call the function. */ | |
2935 | abort (); | |
2936 | } | |
db9f0278 JB |
2937 | } |
2938 | } | |
ef1b0ba7 | 2939 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2940 | val = funcall_lambda (fun, numargs, args + 1); |
2941 | else | |
2942 | { | |
8788120f | 2943 | if (EQ (fun, Qunbound)) |
734d55a2 | 2944 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2945 | if (!CONSP (fun)) |
734d55a2 KS |
2946 | xsignal1 (Qinvalid_function, original_fun); |
2947 | funcar = XCAR (fun); | |
90165123 | 2948 | if (!SYMBOLP (funcar)) |
734d55a2 | 2949 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2950 | if (EQ (funcar, Qlambda)) |
2951 | val = funcall_lambda (fun, numargs, args + 1); | |
db9f0278 JB |
2952 | else if (EQ (funcar, Qautoload)) |
2953 | { | |
8788120f | 2954 | do_autoload (fun, original_fun); |
fff3ff9c | 2955 | CHECK_CONS_LIST (); |
db9f0278 JB |
2956 | goto retry; |
2957 | } | |
2958 | else | |
734d55a2 | 2959 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2960 | } |
c1788fbc | 2961 | CHECK_CONS_LIST (); |
db9f0278 JB |
2962 | lisp_eval_depth--; |
2963 | if (backtrace.debug_on_exit) | |
2964 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2965 | backtrace_list = backtrace.next; | |
2966 | return val; | |
2967 | } | |
2968 | \f | |
2f7c71a1 | 2969 | static Lisp_Object |
d3da34e0 | 2970 | apply_lambda (Lisp_Object fun, Lisp_Object args, int eval_flag) |
db9f0278 JB |
2971 | { |
2972 | Lisp_Object args_left; | |
2973 | Lisp_Object numargs; | |
2974 | register Lisp_Object *arg_vector; | |
2975 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2976 | register int i; | |
2977 | register Lisp_Object tem; | |
3a7a9129 | 2978 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2979 | |
2980 | numargs = Flength (args); | |
b72e0717 | 2981 | SAFE_ALLOCA_LISP (arg_vector, XINT (numargs)); |
db9f0278 JB |
2982 | args_left = args; |
2983 | ||
2984 | GCPRO3 (*arg_vector, args_left, fun); | |
2985 | gcpro1.nvars = 0; | |
2986 | ||
2987 | for (i = 0; i < XINT (numargs);) | |
2988 | { | |
2989 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
2990 | if (eval_flag) tem = Feval (tem); | |
2991 | arg_vector[i++] = tem; | |
2992 | gcpro1.nvars = i; | |
2993 | } | |
2994 | ||
2995 | UNGCPRO; | |
2996 | ||
2997 | if (eval_flag) | |
2998 | { | |
2999 | backtrace_list->args = arg_vector; | |
3000 | backtrace_list->nargs = i; | |
3001 | } | |
3002 | backtrace_list->evalargs = 0; | |
3003 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
3004 | ||
3005 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3006 | if (backtrace_list->debug_on_exit) | |
3007 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3008 | /* Don't do it again when we return to eval. */ | |
3009 | backtrace_list->debug_on_exit = 0; | |
3a7a9129 | 3010 | SAFE_FREE (); |
db9f0278 JB |
3011 | return tem; |
3012 | } | |
3013 | ||
3014 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
3015 | and return the result of evaluation. | |
3016 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3017 | ||
2901f1d1 | 3018 | static Lisp_Object |
d3da34e0 | 3019 | funcall_lambda (Lisp_Object fun, int nargs, register Lisp_Object *arg_vector) |
db9f0278 | 3020 | { |
9ab90667 | 3021 | Lisp_Object val, syms_left, next; |
aed13378 | 3022 | int count = SPECPDL_INDEX (); |
9ab90667 | 3023 | int i, optional, rest; |
db9f0278 | 3024 | |
90165123 | 3025 | if (CONSP (fun)) |
9ab90667 GM |
3026 | { |
3027 | syms_left = XCDR (fun); | |
3028 | if (CONSP (syms_left)) | |
3029 | syms_left = XCAR (syms_left); | |
3030 | else | |
734d55a2 | 3031 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3032 | } |
90165123 | 3033 | else if (COMPILEDP (fun)) |
845975f5 | 3034 | syms_left = AREF (fun, COMPILED_ARGLIST); |
9ab90667 GM |
3035 | else |
3036 | abort (); | |
db9f0278 | 3037 | |
9ab90667 GM |
3038 | i = optional = rest = 0; |
3039 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3040 | { |
3041 | QUIT; | |
177c0ea7 | 3042 | |
9ab90667 | 3043 | next = XCAR (syms_left); |
8788120f | 3044 | if (!SYMBOLP (next)) |
734d55a2 | 3045 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3046 | |
db9f0278 JB |
3047 | if (EQ (next, Qand_rest)) |
3048 | rest = 1; | |
3049 | else if (EQ (next, Qand_optional)) | |
3050 | optional = 1; | |
3051 | else if (rest) | |
3052 | { | |
9ffa21d4 | 3053 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
3054 | i = nargs; |
3055 | } | |
3056 | else if (i < nargs) | |
9ab90667 | 3057 | specbind (next, arg_vector[i++]); |
db9f0278 | 3058 | else if (!optional) |
734d55a2 | 3059 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 JB |
3060 | else |
3061 | specbind (next, Qnil); | |
3062 | } | |
3063 | ||
9ab90667 | 3064 | if (!NILP (syms_left)) |
734d55a2 | 3065 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3066 | else if (i < nargs) |
734d55a2 | 3067 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3068 | |
90165123 | 3069 | if (CONSP (fun)) |
9ab90667 | 3070 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3071 | else |
ca248607 RS |
3072 | { |
3073 | /* If we have not actually read the bytecode string | |
3074 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3075 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3076 | Ffetch_bytecode (fun); |
845975f5 SM |
3077 | val = Fbyte_code (AREF (fun, COMPILED_BYTECODE), |
3078 | AREF (fun, COMPILED_CONSTANTS), | |
3079 | AREF (fun, COMPILED_STACK_DEPTH)); | |
ca248607 | 3080 | } |
177c0ea7 | 3081 | |
db9f0278 JB |
3082 | return unbind_to (count, val); |
3083 | } | |
661c7d6e KH |
3084 | |
3085 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3086 | 1, 1, 0, |
3087 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3088 | (Lisp_Object object) |
661c7d6e KH |
3089 | { |
3090 | Lisp_Object tem; | |
3091 | ||
845975f5 | 3092 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3093 | { |
845975f5 | 3094 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3095 | if (!CONSP (tem)) |
845975f5 SM |
3096 | { |
3097 | tem = AREF (object, COMPILED_BYTECODE); | |
3098 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3099 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3100 | else |
3101 | error ("Invalid byte code"); | |
3102 | } | |
3ae565b3 SM |
3103 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3104 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3105 | } |
3106 | return object; | |
3107 | } | |
db9f0278 JB |
3108 | \f |
3109 | void | |
d3da34e0 | 3110 | grow_specpdl (void) |
db9f0278 | 3111 | { |
aed13378 | 3112 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3113 | if (specpdl_size >= max_specpdl_size) |
3114 | { | |
3115 | if (max_specpdl_size < 400) | |
3116 | max_specpdl_size = 400; | |
3117 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3118 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3119 | } |
3120 | specpdl_size *= 2; | |
3121 | if (specpdl_size > max_specpdl_size) | |
3122 | specpdl_size = max_specpdl_size; | |
3123 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3124 | specpdl_ptr = specpdl + count; | |
3125 | } | |
3126 | ||
4e2db1fe SM |
3127 | /* specpdl_ptr->symbol is a field which describes which variable is |
3128 | let-bound, so it can be properly undone when we unbind_to. | |
3129 | It can have the following two shapes: | |
3130 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3131 | a symbol that is not buffer-local (at least at the time | |
3132 | the let binding started). Note also that it should not be | |
3133 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3134 | to record V2 here). | |
3135 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3136 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3137 | which buffer is affected (or nil if the let-binding affects the | |
3138 | global value of the variable) and BUFFER tells us which buffer was | |
3139 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3140 | BUFFER did not yet have a buffer-local value). */ | |
3141 | ||
db9f0278 | 3142 | void |
d3da34e0 | 3143 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3144 | { |
ce5b453a SM |
3145 | struct Lisp_Symbol *sym; |
3146 | ||
3147 | eassert (!handling_signal); | |
db9f0278 | 3148 | |
b7826503 | 3149 | CHECK_SYMBOL (symbol); |
ce5b453a | 3150 | sym = XSYMBOL (symbol); |
db9f0278 JB |
3151 | if (specpdl_ptr == specpdl + specpdl_size) |
3152 | grow_specpdl (); | |
719177b3 | 3153 | |
ce5b453a SM |
3154 | start: |
3155 | switch (sym->redirect) | |
719177b3 | 3156 | { |
ce5b453a SM |
3157 | case SYMBOL_VARALIAS: |
3158 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3159 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3160 | /* The most common case is that of a non-constant symbol with a |
3161 | trivial value. Make that as fast as we can. */ | |
3162 | specpdl_ptr->symbol = symbol; | |
3163 | specpdl_ptr->old_value = SYMBOL_VAL (sym); | |
3164 | specpdl_ptr->func = NULL; | |
3165 | ++specpdl_ptr; | |
3166 | if (!sym->constant) | |
3167 | SET_SYMBOL_VAL (sym, value); | |
3168 | else | |
3169 | set_internal (symbol, value, Qnil, 1); | |
3170 | break; | |
4e2db1fe SM |
3171 | case SYMBOL_LOCALIZED: |
3172 | if (SYMBOL_BLV (sym)->frame_local) | |
3173 | error ("Frame-local vars cannot be let-bound"); | |
3174 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3175 | { |
3176 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3177 | specpdl_ptr->func = 0; | |
3178 | specpdl_ptr->old_value = ovalue; | |
3179 | ||
3180 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3181 | || (EQ (SYMBOL_BLV (sym)->where, | |
3182 | SYMBOL_BLV (sym)->frame_local ? | |
3183 | Fselected_frame () : Fcurrent_buffer ()))); | |
3184 | ||
3185 | if (sym->redirect == SYMBOL_LOCALIZED | |
3186 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3187 | { | |
3188 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3189 | ||
3190 | /* For a local variable, record both the symbol and which | |
3191 | buffer's or frame's value we are saving. */ | |
3192 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3193 | { | |
3194 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3195 | || (BLV_FOUND (SYMBOL_BLV (sym)) | |
3196 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); | |
3197 | where = cur_buf; | |
3198 | } | |
3199 | else if (sym->redirect == SYMBOL_LOCALIZED | |
3200 | && BLV_FOUND (SYMBOL_BLV (sym))) | |
3201 | where = SYMBOL_BLV (sym)->where; | |
3202 | else | |
3203 | where = Qnil; | |
3204 | ||
3205 | /* We're not using the `unused' slot in the specbinding | |
3206 | structure because this would mean we have to do more | |
3207 | work for simple variables. */ | |
3208 | /* FIXME: The third value `current_buffer' is only used in | |
3209 | let_shadows_buffer_binding_p which is itself only used | |
3210 | in set_internal for local_if_set. */ | |
4e2db1fe | 3211 | eassert (NILP (where) || EQ (where, cur_buf)); |
ce5b453a SM |
3212 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, cur_buf)); |
3213 | ||
3214 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3215 | buffer-local value here, make the `let' change the global | |
3216 | value by changing the value of SYMBOL in all buffers not | |
3217 | having their own value. This is consistent with what | |
3218 | happens with other buffer-local variables. */ | |
3219 | if (NILP (where) | |
3220 | && sym->redirect == SYMBOL_FORWARDED) | |
3221 | { | |
3222 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3223 | ++specpdl_ptr; | |
3224 | Fset_default (symbol, value); | |
3225 | return; | |
3226 | } | |
3227 | } | |
3228 | else | |
3229 | specpdl_ptr->symbol = symbol; | |
3230 | ||
3231 | specpdl_ptr++; | |
94b612ad | 3232 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3233 | break; |
3234 | } | |
3235 | default: abort (); | |
9ab90667 | 3236 | } |
db9f0278 JB |
3237 | } |
3238 | ||
3239 | void | |
d3da34e0 | 3240 | record_unwind_protect (Lisp_Object (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3241 | { |
9ba8e10d CY |
3242 | eassert (!handling_signal); |
3243 | ||
db9f0278 JB |
3244 | if (specpdl_ptr == specpdl + specpdl_size) |
3245 | grow_specpdl (); | |
3246 | specpdl_ptr->func = function; | |
3247 | specpdl_ptr->symbol = Qnil; | |
3248 | specpdl_ptr->old_value = arg; | |
3249 | specpdl_ptr++; | |
3250 | } | |
3251 | ||
3252 | Lisp_Object | |
d3da34e0 | 3253 | unbind_to (int count, Lisp_Object value) |
db9f0278 | 3254 | { |
5a073f50 KS |
3255 | Lisp_Object quitf = Vquit_flag; |
3256 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3257 | |
5a073f50 | 3258 | GCPRO2 (value, quitf); |
db9f0278 JB |
3259 | Vquit_flag = Qnil; |
3260 | ||
3261 | while (specpdl_ptr != specpdl + count) | |
3262 | { | |
611a8f8c RS |
3263 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3264 | the work to unbind it. We decrement first | |
3265 | so that an error in unbinding won't try to unbind | |
3266 | the same entry again, and we copy the binding first | |
3267 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3268 | |
45f266dc DL |
3269 | struct specbinding this_binding; |
3270 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3271 | |
3272 | if (this_binding.func != 0) | |
3273 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3274 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3275 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3276 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3277 | bound a variable that had a buffer-local or frame-local |
3278 | binding. WHERE nil means that the variable had the default | |
0967b4b0 | 3279 | value when it was bound. CURRENT-BUFFER is the buffer that |
bb8e180f | 3280 | was current when the variable was bound. */ |
611a8f8c | 3281 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3282 | { |
eb700b82 | 3283 | Lisp_Object symbol, where; |
719177b3 | 3284 | |
611a8f8c RS |
3285 | symbol = XCAR (this_binding.symbol); |
3286 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3287 | |
eb700b82 | 3288 | if (NILP (where)) |
611a8f8c | 3289 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3290 | /* If `where' is non-nil, reset the value in the appropriate |
3291 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3292 | else if (BUFFERP (where) |
3293 | ? !NILP (Flocal_variable_p (symbol, where)) | |
3294 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) | |
3295 | set_internal (symbol, this_binding.old_value, where, 1); | |
719177b3 | 3296 | } |
94b612ad SM |
3297 | /* If variable has a trivial value (no forwarding), we can |
3298 | just set it. No need to check for constant symbols here, | |
3299 | since that was already done by specbind. */ | |
3300 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3301 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3302 | this_binding.old_value); | |
db9f0278 | 3303 | else |
94b612ad SM |
3304 | /* NOTE: we only ever come here if make_local_foo was used for |
3305 | the first time on this var within this let. */ | |
3306 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3307 | } |
177c0ea7 | 3308 | |
5a073f50 KS |
3309 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3310 | Vquit_flag = quitf; | |
db9f0278 JB |
3311 | |
3312 | UNGCPRO; | |
db9f0278 JB |
3313 | return value; |
3314 | } | |
3315 | \f | |
db9f0278 | 3316 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3317 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3318 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3319 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 JB |
3320 | { |
3321 | register struct backtrace *backlist = backtrace_list; | |
3322 | register int i; | |
3323 | ||
b7826503 | 3324 | CHECK_NUMBER (level); |
db9f0278 JB |
3325 | |
3326 | for (i = 0; backlist && i < XINT (level); i++) | |
3327 | { | |
3328 | backlist = backlist->next; | |
3329 | } | |
3330 | ||
3331 | if (backlist) | |
265a9e55 | 3332 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3333 | |
3334 | return flag; | |
3335 | } | |
3336 | ||
3337 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3338 | doc: /* Print a trace of Lisp function calls currently active. |
3339 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3340 | (void) |
db9f0278 JB |
3341 | { |
3342 | register struct backtrace *backlist = backtrace_list; | |
3343 | register int i; | |
3344 | Lisp_Object tail; | |
3345 | Lisp_Object tem; | |
db9f0278 | 3346 | struct gcpro gcpro1; |
d4b6d95d | 3347 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3348 | |
d4b6d95d LMI |
3349 | if (NILP (Vprint_level)) |
3350 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 JB |
3351 | |
3352 | tail = Qnil; | |
3353 | GCPRO1 (tail); | |
3354 | ||
3355 | while (backlist) | |
3356 | { | |
3357 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
3358 | if (backlist->nargs == UNEVALLED) | |
3359 | { | |
3360 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3361 | write_string ("\n", -1); |
db9f0278 JB |
3362 | } |
3363 | else | |
3364 | { | |
3365 | tem = *backlist->function; | |
3366 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
3367 | write_string ("(", -1); | |
3368 | if (backlist->nargs == MANY) | |
3369 | { | |
3370 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 3371 | !NILP (tail); |
db9f0278 JB |
3372 | tail = Fcdr (tail), i++) |
3373 | { | |
3374 | if (i) write_string (" ", -1); | |
3375 | Fprin1 (Fcar (tail), Qnil); | |
3376 | } | |
3377 | } | |
3378 | else | |
3379 | { | |
3380 | for (i = 0; i < backlist->nargs; i++) | |
3381 | { | |
3382 | if (i) write_string (" ", -1); | |
3383 | Fprin1 (backlist->args[i], Qnil); | |
3384 | } | |
3385 | } | |
b6703b02 | 3386 | write_string (")\n", -1); |
db9f0278 | 3387 | } |
db9f0278 JB |
3388 | backlist = backlist->next; |
3389 | } | |
3390 | ||
d4b6d95d | 3391 | Vprint_level = old_print_level; |
db9f0278 JB |
3392 | UNGCPRO; |
3393 | return Qnil; | |
3394 | } | |
3395 | ||
17401c97 | 3396 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3397 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3398 | If that frame has not evaluated the arguments yet (or is a special form), | |
3399 | the value is (nil FUNCTION ARG-FORMS...). | |
3400 | If that frame has evaluated its arguments and called its function already, | |
3401 | the value is (t FUNCTION ARG-VALUES...). | |
3402 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3403 | FUNCTION is whatever was supplied as car of evaluated list, | |
3404 | or a lambda expression for macro calls. | |
3405 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3406 | (Lisp_Object nframes) |
db9f0278 JB |
3407 | { |
3408 | register struct backtrace *backlist = backtrace_list; | |
3409 | register int i; | |
3410 | Lisp_Object tem; | |
3411 | ||
b7826503 | 3412 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3413 | |
3414 | /* Find the frame requested. */ | |
b6703b02 | 3415 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3416 | backlist = backlist->next; |
3417 | ||
3418 | if (!backlist) | |
3419 | return Qnil; | |
3420 | if (backlist->nargs == UNEVALLED) | |
3421 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
3422 | else | |
3423 | { | |
3424 | if (backlist->nargs == MANY) | |
3425 | tem = *backlist->args; | |
3426 | else | |
3427 | tem = Flist (backlist->nargs, backlist->args); | |
3428 | ||
3429 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3430 | } | |
3431 | } | |
a2ff3819 | 3432 | |
db9f0278 | 3433 | \f |
4ce0541e | 3434 | void |
d3da34e0 | 3435 | mark_backtrace (void) |
4ce0541e SM |
3436 | { |
3437 | register struct backtrace *backlist; | |
3438 | register int i; | |
3439 | ||
3440 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3441 | { | |
3442 | mark_object (*backlist->function); | |
3443 | ||
3444 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) | |
3445 | i = 0; | |
3446 | else | |
3447 | i = backlist->nargs - 1; | |
3448 | for (; i >= 0; i--) | |
3449 | mark_object (backlist->args[i]); | |
3450 | } | |
3451 | } | |
3452 | ||
dfcf069d | 3453 | void |
d3da34e0 | 3454 | syms_of_eval (void) |
db9f0278 | 3455 | { |
29208e82 | 3456 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
82fc29a1 | 3457 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3458 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3459 | an error is signaled. |
3460 | You can safely use a value considerably larger than the default value, | |
3461 | if that proves inconveniently small. However, if you increase it too far, | |
3462 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3463 | |
29208e82 | 3464 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
9dbc9081 | 3465 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3466 | |
3467 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3468 | actual stack overflow in C, which would be fatal for Emacs. |
3469 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3470 | if that proves inconveniently small. However, if you increase it too far, |
3471 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3472 | |
29208e82 | 3473 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3474 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3475 | If the value is t, that means do an ordinary quit. |
3476 | If the value equals `throw-on-input', that means quit by throwing | |
3477 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3478 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3479 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3480 | Vquit_flag = Qnil; |
3481 | ||
29208e82 | 3482 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3483 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3484 | Note that `quit-flag' will still be set by typing C-g, | |
3485 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3486 | To prevent this happening, set `quit-flag' to nil | |
3487 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3488 | Vinhibit_quit = Qnil; |
3489 | ||
d67b4f80 | 3490 | Qinhibit_quit = intern_c_string ("inhibit-quit"); |
ad236261 JB |
3491 | staticpro (&Qinhibit_quit); |
3492 | ||
d67b4f80 | 3493 | Qautoload = intern_c_string ("autoload"); |
db9f0278 JB |
3494 | staticpro (&Qautoload); |
3495 | ||
d67b4f80 | 3496 | Qdebug_on_error = intern_c_string ("debug-on-error"); |
db9f0278 JB |
3497 | staticpro (&Qdebug_on_error); |
3498 | ||
d67b4f80 | 3499 | Qmacro = intern_c_string ("macro"); |
db9f0278 JB |
3500 | staticpro (&Qmacro); |
3501 | ||
d67b4f80 | 3502 | Qdeclare = intern_c_string ("declare"); |
d6edd563 | 3503 | staticpro (&Qdeclare); |
177c0ea7 | 3504 | |
db9f0278 JB |
3505 | /* Note that the process handling also uses Qexit, but we don't want |
3506 | to staticpro it twice, so we just do it here. */ | |
d67b4f80 | 3507 | Qexit = intern_c_string ("exit"); |
db9f0278 JB |
3508 | staticpro (&Qexit); |
3509 | ||
d67b4f80 | 3510 | Qinteractive = intern_c_string ("interactive"); |
db9f0278 JB |
3511 | staticpro (&Qinteractive); |
3512 | ||
d67b4f80 | 3513 | Qcommandp = intern_c_string ("commandp"); |
db9f0278 JB |
3514 | staticpro (&Qcommandp); |
3515 | ||
d67b4f80 | 3516 | Qdefun = intern_c_string ("defun"); |
db9f0278 JB |
3517 | staticpro (&Qdefun); |
3518 | ||
d67b4f80 | 3519 | Qand_rest = intern_c_string ("&rest"); |
db9f0278 JB |
3520 | staticpro (&Qand_rest); |
3521 | ||
d67b4f80 | 3522 | Qand_optional = intern_c_string ("&optional"); |
db9f0278 JB |
3523 | staticpro (&Qand_optional); |
3524 | ||
d67b4f80 | 3525 | Qdebug = intern_c_string ("debug"); |
f01cbfdd RS |
3526 | staticpro (&Qdebug); |
3527 | ||
29208e82 | 3528 | DEFVAR_LISP ("stack-trace-on-error", Vstack_trace_on_error, |
704788b3 RS |
3529 | doc: /* *Non-nil means errors display a backtrace buffer. |
3530 | More precisely, this happens for any error that is handled | |
3531 | by the editor command loop. | |
9dbc9081 PJ |
3532 | If the value is a list, an error only means to display a backtrace |
3533 | if one of its condition symbols appears in the list. */); | |
128c0f66 | 3534 | Vstack_trace_on_error = Qnil; |
db9f0278 | 3535 | |
29208e82 | 3536 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
9dbc9081 PJ |
3537 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3538 | Does not apply to errors handled by `condition-case' or those | |
3539 | matched by `debug-ignored-errors'. | |
3540 | If the value is a list, an error only means to enter the debugger | |
3541 | if one of its condition symbols appears in the list. | |
3542 | When you evaluate an expression interactively, this variable | |
3543 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f CY |
3544 | The command `toggle-debug-on-error' toggles this. |
3545 | See also the variable `debug-on-quit'. */); | |
128c0f66 | 3546 | Vdebug_on_error = Qnil; |
db9f0278 | 3547 | |
29208e82 | 3548 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
9dbc9081 PJ |
3549 | doc: /* *List of errors for which the debugger should not be called. |
3550 | Each element may be a condition-name or a regexp that matches error messages. | |
3551 | If any element applies to a given error, that error skips the debugger | |
3552 | and just returns to top level. | |
3553 | This overrides the variable `debug-on-error'. | |
3554 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3555 | Vdebug_ignored_errors = Qnil; |
3556 | ||
29208e82 | 3557 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
82fc29a1 JB |
3558 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3559 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3560 | debug_on_quit = 0; |
3561 | ||
29208e82 | 3562 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3563 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3564 | |
29208e82 | 3565 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3566 | doc: /* Non-nil means debugger may continue execution. |
3567 | This is nil when the debugger is called under circumstances where it | |
3568 | might not be safe to continue. */); | |
dac204bc | 3569 | debugger_may_continue = 1; |
556d7314 | 3570 | |
29208e82 | 3571 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3572 | doc: /* Function to call to invoke debugger. |
3573 | If due to frame exit, args are `exit' and the value being returned; | |
3574 | this function's value will be returned instead of that. | |
3575 | If due to error, args are `error' and a list of the args to `signal'. | |
3576 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3577 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3578 | Vdebugger = Qnil; |
3579 | ||
29208e82 | 3580 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3581 | doc: /* If non-nil, this is a function for `signal' to call. |
3582 | It receives the same arguments that `signal' was given. | |
3583 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3584 | Vsignal_hook_function = Qnil; |
3585 | ||
29208e82 | 3586 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
9dbc9081 PJ |
3587 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3588 | Note that `debug-on-error', `debug-on-quit' and friends | |
3589 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3590 | Vdebug_on_signal = Qnil; |
61ede770 | 3591 | |
29208e82 | 3592 | DEFVAR_LISP ("macro-declaration-function", Vmacro_declaration_function, |
d6edd563 GM |
3593 | doc: /* Function to process declarations in a macro definition. |
3594 | The function will be called with two args MACRO and DECL. | |
3595 | MACRO is the name of the macro being defined. | |
3596 | DECL is a list `(declare ...)' containing the declarations. | |
3597 | The value the function returns is not used. */); | |
3598 | Vmacro_declaration_function = Qnil; | |
3599 | ||
d67b4f80 | 3600 | Vrun_hooks = intern_c_string ("run-hooks"); |
6e6e9f08 | 3601 | staticpro (&Vrun_hooks); |
db9f0278 JB |
3602 | |
3603 | staticpro (&Vautoload_queue); | |
3604 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3605 | staticpro (&Vsignaling_function); |
3606 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3607 | |
3608 | defsubr (&Sor); | |
3609 | defsubr (&Sand); | |
3610 | defsubr (&Sif); | |
3611 | defsubr (&Scond); | |
3612 | defsubr (&Sprogn); | |
3613 | defsubr (&Sprog1); | |
3614 | defsubr (&Sprog2); | |
3615 | defsubr (&Ssetq); | |
3616 | defsubr (&Squote); | |
3617 | defsubr (&Sfunction); | |
3618 | defsubr (&Sdefun); | |
3619 | defsubr (&Sdefmacro); | |
3620 | defsubr (&Sdefvar); | |
19cebf5a | 3621 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3622 | defsubr (&Sdefconst); |
3623 | defsubr (&Suser_variable_p); | |
3624 | defsubr (&Slet); | |
3625 | defsubr (&SletX); | |
3626 | defsubr (&Swhile); | |
3627 | defsubr (&Smacroexpand); | |
3628 | defsubr (&Scatch); | |
3629 | defsubr (&Sthrow); | |
3630 | defsubr (&Sunwind_protect); | |
3631 | defsubr (&Scondition_case); | |
3632 | defsubr (&Ssignal); | |
3633 | defsubr (&Sinteractive_p); | |
4b664e76 | 3634 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
3635 | defsubr (&Scommandp); |
3636 | defsubr (&Sautoload); | |
3637 | defsubr (&Seval); | |
3638 | defsubr (&Sapply); | |
3639 | defsubr (&Sfuncall); | |
ff936e53 SM |
3640 | defsubr (&Srun_hooks); |
3641 | defsubr (&Srun_hook_with_args); | |
3642 | defsubr (&Srun_hook_with_args_until_success); | |
3643 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 3644 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3645 | defsubr (&Sbacktrace_debug); |
3646 | defsubr (&Sbacktrace); | |
3647 | defsubr (&Sbacktrace_frame); | |
3648 | } | |
ab5796a9 | 3649 |