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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
73b0cd50 | 2 | Copyright (C) 1985-1987, 1993-1995, 1999-2011 Free Software Foundation, Inc. |
db9f0278 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
9ec0b715 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
db9f0278 | 7 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
8 | the Free Software Foundation, either version 3 of the License, or |
9 | (at your option) any later version. | |
db9f0278 JB |
10 | |
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
db9f0278 JB |
18 | |
19 | ||
18160b98 | 20 | #include <config.h> |
d7306fe6 | 21 | #include <setjmp.h> |
db9f0278 | 22 | #include "lisp.h" |
9ac0d9e0 | 23 | #include "blockinput.h" |
db9f0278 | 24 | #include "commands.h" |
1f98fa48 | 25 | #include "keyboard.h" |
3648c842 | 26 | #include "dispextern.h" |
94b612ad | 27 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 28 | |
b70e1a2b SM |
29 | #if HAVE_X_WINDOWS |
30 | #include "xterm.h" | |
31 | #endif | |
32 | ||
db9f0278 JB |
33 | /* This definition is duplicated in alloc.c and keyboard.c */ |
34 | /* Putting it in lisp.h makes cc bomb out! */ | |
35 | ||
36 | struct backtrace | |
4c576a83 GM |
37 | { |
38 | struct backtrace *next; | |
39 | Lisp_Object *function; | |
40 | Lisp_Object *args; /* Points to vector of args. */ | |
c5101a77 PE |
41 | size_t nargs; /* Length of vector. |
42 | If nargs is (size_t) UNEVALLED, args points | |
43 | to slot holding list of unevalled args */ | |
4c576a83 GM |
44 | char evalargs; |
45 | /* Nonzero means call value of debugger when done with this operation. */ | |
46 | char debug_on_exit; | |
47 | }; | |
db9f0278 JB |
48 | |
49 | struct backtrace *backtrace_list; | |
50 | ||
db9f0278 JB |
51 | struct catchtag *catchlist; |
52 | ||
15934ffa RS |
53 | #ifdef DEBUG_GCPRO |
54 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
55 | int gcpro_level; | |
56 | #endif | |
57 | ||
6fd797f5 | 58 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
29208e82 | 59 | Lisp_Object Qinhibit_quit; |
db9f0278 JB |
60 | Lisp_Object Qand_rest, Qand_optional; |
61 | Lisp_Object Qdebug_on_error; | |
d6edd563 | 62 | Lisp_Object Qdeclare; |
f01cbfdd | 63 | Lisp_Object Qdebug; |
db9f0278 | 64 | |
6e6e9f08 RS |
65 | /* This holds either the symbol `run-hooks' or nil. |
66 | It is nil at an early stage of startup, and when Emacs | |
67 | is shutting down. */ | |
4c576a83 | 68 | |
db9f0278 JB |
69 | Lisp_Object Vrun_hooks; |
70 | ||
71 | /* Non-nil means record all fset's and provide's, to be undone | |
72 | if the file being autoloaded is not fully loaded. | |
73 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 74 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
75 | |
76 | Lisp_Object Vautoload_queue; | |
77 | ||
78 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 79 | |
5816888b | 80 | EMACS_INT specpdl_size; |
db9f0278 JB |
81 | |
82 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 83 | |
db9f0278 JB |
84 | struct specbinding *specpdl; |
85 | ||
86 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 87 | |
ab837828 | 88 | struct specbinding *specpdl_ptr; |
db9f0278 | 89 | |
db9f0278 | 90 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 91 | |
5816888b | 92 | EMACS_INT lisp_eval_depth; |
db9f0278 | 93 | |
be857679 | 94 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 95 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 96 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
97 | know that the debugger itself has an error, and we should just |
98 | signal the error instead of entering an infinite loop of debugger | |
99 | invocations. */ | |
4c576a83 | 100 | |
82da7701 | 101 | int when_entered_debugger; |
db9f0278 | 102 | |
a2ff3819 GM |
103 | /* The function from which the last `signal' was called. Set in |
104 | Fsignal. */ | |
105 | ||
106 | Lisp_Object Vsignaling_function; | |
107 | ||
4c576a83 GM |
108 | /* Set to non-zero while processing X events. Checked in Feval to |
109 | make sure the Lisp interpreter isn't called from a signal handler, | |
110 | which is unsafe because the interpreter isn't reentrant. */ | |
111 | ||
112 | int handling_signal; | |
113 | ||
c5101a77 | 114 | static Lisp_Object funcall_lambda (Lisp_Object, size_t, Lisp_Object*); |
f57e2426 | 115 | static void unwind_to_catch (struct catchtag *, Lisp_Object) NO_RETURN; |
2f7c71a1 AS |
116 | static int interactive_p (int); |
117 | static Lisp_Object apply_lambda (Lisp_Object, Lisp_Object, int); | |
873759d5 | 118 | \f |
dfcf069d | 119 | void |
d3da34e0 | 120 | init_eval_once (void) |
db9f0278 JB |
121 | { |
122 | specpdl_size = 50; | |
716acfce | 123 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 124 | specpdl_ptr = specpdl; |
6588243d | 125 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
a4547405 | 126 | max_specpdl_size = 1000; |
d46f6bbb | 127 | max_lisp_eval_depth = 600; |
34d470ba RS |
128 | |
129 | Vrun_hooks = Qnil; | |
db9f0278 JB |
130 | } |
131 | ||
dfcf069d | 132 | void |
d3da34e0 | 133 | init_eval (void) |
db9f0278 JB |
134 | { |
135 | specpdl_ptr = specpdl; | |
136 | catchlist = 0; | |
137 | handlerlist = 0; | |
138 | backtrace_list = 0; | |
139 | Vquit_flag = Qnil; | |
140 | debug_on_next_call = 0; | |
141 | lisp_eval_depth = 0; | |
87e21fbd | 142 | #ifdef DEBUG_GCPRO |
15934ffa | 143 | gcpro_level = 0; |
87e21fbd | 144 | #endif |
be857679 | 145 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 146 | when_entered_debugger = -1; |
db9f0278 JB |
147 | } |
148 | ||
9f5903bb RS |
149 | /* unwind-protect function used by call_debugger. */ |
150 | ||
151 | static Lisp_Object | |
d3da34e0 | 152 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
153 | { |
154 | max_specpdl_size = XINT (XCAR (data)); | |
155 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 156 | return Qnil; |
9f5903bb RS |
157 | } |
158 | ||
159 | /* Call the Lisp debugger, giving it argument ARG. */ | |
160 | ||
475545b5 | 161 | static Lisp_Object |
d3da34e0 | 162 | call_debugger (Lisp_Object arg) |
db9f0278 | 163 | { |
3648c842 | 164 | int debug_while_redisplaying; |
aed13378 | 165 | int count = SPECPDL_INDEX (); |
3648c842 | 166 | Lisp_Object val; |
5816888b | 167 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 168 | |
9f5903bb RS |
169 | /* Temporarily bump up the stack limits, |
170 | so the debugger won't run out of stack. */ | |
177c0ea7 | 171 | |
9f5903bb RS |
172 | max_specpdl_size += 1; |
173 | record_unwind_protect (restore_stack_limits, | |
174 | Fcons (make_number (old_max), | |
175 | make_number (max_lisp_eval_depth))); | |
176 | max_specpdl_size = old_max; | |
177 | ||
178 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
179 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
180 | ||
181 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
182 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 183 | |
d148e14d | 184 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
185 | if (display_hourglass_p) |
186 | cancel_hourglass (); | |
237c23b0 GM |
187 | #endif |
188 | ||
db9f0278 | 189 | debug_on_next_call = 0; |
be857679 | 190 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
191 | |
192 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
193 | displayed if the debugger is invoked during redisplay. */ | |
194 | debug_while_redisplaying = redisplaying_p; | |
195 | redisplaying_p = 0; | |
556d7314 GM |
196 | specbind (intern ("debugger-may-continue"), |
197 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 198 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 199 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
200 | |
201 | #if 0 /* Binding this prevents execution of Lisp code during | |
202 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 203 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 204 | #endif |
177c0ea7 | 205 | |
3648c842 GM |
206 | val = apply1 (Vdebugger, arg); |
207 | ||
208 | /* Interrupting redisplay and resuming it later is not safe under | |
209 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 210 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
211 | if (debug_while_redisplaying) |
212 | Ftop_level (); | |
213 | ||
556d7314 | 214 | return unbind_to (count, val); |
db9f0278 JB |
215 | } |
216 | ||
475545b5 | 217 | static void |
d3da34e0 | 218 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
219 | { |
220 | debug_on_next_call = 0; | |
221 | backtrace_list->debug_on_exit = 1; | |
222 | call_debugger (Fcons (code, Qnil)); | |
223 | } | |
224 | \f | |
225 | /* NOTE!!! Every function that can call EVAL must protect its args | |
226 | and temporaries from garbage collection while it needs them. | |
227 | The definition of `For' shows what you have to do. */ | |
228 | ||
229 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
230 | doc: /* Eval args until one of them yields non-nil, then return that value. |
231 | The remaining args are not evalled at all. | |
232 | If all args return nil, return nil. | |
533eb34b | 233 | usage: (or CONDITIONS...) */) |
5842a27b | 234 | (Lisp_Object args) |
db9f0278 | 235 | { |
e509f168 | 236 | register Lisp_Object val = Qnil; |
db9f0278 JB |
237 | struct gcpro gcpro1; |
238 | ||
e509f168 | 239 | GCPRO1 (args); |
db9f0278 | 240 | |
e509f168 | 241 | while (CONSP (args)) |
db9f0278 | 242 | { |
e509f168 | 243 | val = Feval (XCAR (args)); |
265a9e55 | 244 | if (!NILP (val)) |
db9f0278 | 245 | break; |
e509f168 | 246 | args = XCDR (args); |
db9f0278 | 247 | } |
db9f0278 JB |
248 | |
249 | UNGCPRO; | |
250 | return val; | |
251 | } | |
252 | ||
253 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 254 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
255 | The remaining args are not evalled at all. |
256 | If no arg yields nil, return the last arg's value. | |
533eb34b | 257 | usage: (and CONDITIONS...) */) |
5842a27b | 258 | (Lisp_Object args) |
db9f0278 | 259 | { |
e509f168 | 260 | register Lisp_Object val = Qt; |
db9f0278 JB |
261 | struct gcpro gcpro1; |
262 | ||
e509f168 | 263 | GCPRO1 (args); |
db9f0278 | 264 | |
e509f168 | 265 | while (CONSP (args)) |
db9f0278 | 266 | { |
e509f168 | 267 | val = Feval (XCAR (args)); |
265a9e55 | 268 | if (NILP (val)) |
db9f0278 | 269 | break; |
e509f168 | 270 | args = XCDR (args); |
db9f0278 | 271 | } |
db9f0278 JB |
272 | |
273 | UNGCPRO; | |
274 | return val; | |
275 | } | |
276 | ||
277 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 278 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
279 | Returns the value of THEN or the value of the last of the ELSE's. |
280 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
281 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 282 | usage: (if COND THEN ELSE...) */) |
5842a27b | 283 | (Lisp_Object args) |
db9f0278 JB |
284 | { |
285 | register Lisp_Object cond; | |
286 | struct gcpro gcpro1; | |
287 | ||
288 | GCPRO1 (args); | |
289 | cond = Feval (Fcar (args)); | |
290 | UNGCPRO; | |
291 | ||
265a9e55 | 292 | if (!NILP (cond)) |
db9f0278 JB |
293 | return Feval (Fcar (Fcdr (args))); |
294 | return Fprogn (Fcdr (Fcdr (args))); | |
295 | } | |
296 | ||
297 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
298 | doc: /* Try each clause until one succeeds. |
299 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
300 | and, if the value is non-nil, this clause succeeds: | |
301 | then the expressions in BODY are evaluated and the last one's | |
302 | value is the value of the cond-form. | |
303 | If no clause succeeds, cond returns nil. | |
304 | If a clause has one element, as in (CONDITION), | |
305 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 306 | usage: (cond CLAUSES...) */) |
5842a27b | 307 | (Lisp_Object args) |
db9f0278 JB |
308 | { |
309 | register Lisp_Object clause, val; | |
310 | struct gcpro gcpro1; | |
311 | ||
312 | val = Qnil; | |
313 | GCPRO1 (args); | |
265a9e55 | 314 | while (!NILP (args)) |
db9f0278 JB |
315 | { |
316 | clause = Fcar (args); | |
317 | val = Feval (Fcar (clause)); | |
265a9e55 | 318 | if (!NILP (val)) |
db9f0278 | 319 | { |
03699b14 KR |
320 | if (!EQ (XCDR (clause), Qnil)) |
321 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
322 | break; |
323 | } | |
03699b14 | 324 | args = XCDR (args); |
db9f0278 JB |
325 | } |
326 | UNGCPRO; | |
327 | ||
328 | return val; | |
329 | } | |
330 | ||
331 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
9dbc9081 | 332 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 333 | usage: (progn BODY...) */) |
5842a27b | 334 | (Lisp_Object args) |
db9f0278 | 335 | { |
e509f168 | 336 | register Lisp_Object val = Qnil; |
db9f0278 JB |
337 | struct gcpro gcpro1; |
338 | ||
e509f168 | 339 | GCPRO1 (args); |
db9f0278 | 340 | |
e509f168 | 341 | while (CONSP (args)) |
db9f0278 | 342 | { |
e509f168 SM |
343 | val = Feval (XCAR (args)); |
344 | args = XCDR (args); | |
db9f0278 | 345 | } |
db9f0278 JB |
346 | |
347 | UNGCPRO; | |
348 | return val; | |
349 | } | |
350 | ||
351 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 352 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
353 | The value of FIRST is saved during the evaluation of the remaining args, |
354 | whose values are discarded. | |
7a25dc6d | 355 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 356 | (Lisp_Object args) |
db9f0278 JB |
357 | { |
358 | Lisp_Object val; | |
359 | register Lisp_Object args_left; | |
360 | struct gcpro gcpro1, gcpro2; | |
361 | register int argnum = 0; | |
362 | ||
9ac66b45 | 363 | if (NILP (args)) |
db9f0278 JB |
364 | return Qnil; |
365 | ||
366 | args_left = args; | |
367 | val = Qnil; | |
368 | GCPRO2 (args, val); | |
369 | ||
370 | do | |
371 | { | |
372 | if (!(argnum++)) | |
bb8e180f | 373 | val = Feval (Fcar (args_left)); |
db9f0278 JB |
374 | else |
375 | Feval (Fcar (args_left)); | |
376 | args_left = Fcdr (args_left); | |
377 | } | |
265a9e55 | 378 | while (!NILP(args_left)); |
db9f0278 JB |
379 | |
380 | UNGCPRO; | |
381 | return val; | |
382 | } | |
383 | ||
384 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 385 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
386 | The value of FORM2 is saved during the evaluation of the |
387 | remaining args, whose values are discarded. | |
388 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 389 | (Lisp_Object args) |
db9f0278 JB |
390 | { |
391 | Lisp_Object val; | |
392 | register Lisp_Object args_left; | |
393 | struct gcpro gcpro1, gcpro2; | |
394 | register int argnum = -1; | |
395 | ||
396 | val = Qnil; | |
397 | ||
87d238ba | 398 | if (NILP (args)) |
db9f0278 JB |
399 | return Qnil; |
400 | ||
401 | args_left = args; | |
402 | val = Qnil; | |
403 | GCPRO2 (args, val); | |
404 | ||
405 | do | |
406 | { | |
407 | if (!(argnum++)) | |
bb8e180f | 408 | val = Feval (Fcar (args_left)); |
db9f0278 JB |
409 | else |
410 | Feval (Fcar (args_left)); | |
411 | args_left = Fcdr (args_left); | |
412 | } | |
87d238ba | 413 | while (!NILP (args_left)); |
db9f0278 JB |
414 | |
415 | UNGCPRO; | |
416 | return val; | |
417 | } | |
418 | ||
419 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
420 | doc: /* Set each SYM to the value of its VAL. |
421 | The symbols SYM are variables; they are literal (not evaluated). | |
422 | The values VAL are expressions; they are evaluated. | |
423 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
424 | The second VAL is not computed until after the first SYM is set, and so on; | |
425 | each VAL can use the new value of variables set earlier in the `setq'. | |
426 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 427 | usage: (setq [SYM VAL]...) */) |
5842a27b | 428 | (Lisp_Object args) |
db9f0278 JB |
429 | { |
430 | register Lisp_Object args_left; | |
431 | register Lisp_Object val, sym; | |
432 | struct gcpro gcpro1; | |
433 | ||
1283140e | 434 | if (NILP (args)) |
db9f0278 JB |
435 | return Qnil; |
436 | ||
437 | args_left = args; | |
438 | GCPRO1 (args); | |
439 | ||
440 | do | |
441 | { | |
442 | val = Feval (Fcar (Fcdr (args_left))); | |
443 | sym = Fcar (args_left); | |
444 | Fset (sym, val); | |
445 | args_left = Fcdr (Fcdr (args_left)); | |
446 | } | |
265a9e55 | 447 | while (!NILP(args_left)); |
db9f0278 JB |
448 | |
449 | UNGCPRO; | |
450 | return val; | |
451 | } | |
177c0ea7 | 452 | |
db9f0278 | 453 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
454 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
455 | usage: (quote ARG) */) | |
5842a27b | 456 | (Lisp_Object args) |
db9f0278 | 457 | { |
1283140e RS |
458 | if (!NILP (Fcdr (args))) |
459 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
460 | return Fcar (args); |
461 | } | |
177c0ea7 | 462 | |
db9f0278 | 463 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
464 | doc: /* Like `quote', but preferred for objects which are functions. |
465 | In byte compilation, `function' causes its argument to be compiled. | |
466 | `quote' cannot do that. | |
467 | usage: (function ARG) */) | |
5842a27b | 468 | (Lisp_Object args) |
db9f0278 | 469 | { |
1283140e RS |
470 | if (!NILP (Fcdr (args))) |
471 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
db9f0278 JB |
472 | return Fcar (args); |
473 | } | |
474 | ||
e0f331ab | 475 | |
db9f0278 | 476 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
84b17ab0 | 477 | doc: /* Return t if the containing function was run directly by user input. |
82fc29a1 JB |
478 | This means that the function was called with `call-interactively' |
479 | \(which includes being called as the binding of a key) | |
84b17ab0 | 480 | and input is currently coming from the keyboard (not a keyboard macro), |
c63df42b RS |
481 | and Emacs is not running in batch mode (`noninteractive' is nil). |
482 | ||
483 | The only known proper use of `interactive-p' is in deciding whether to | |
484 | display a helpful message, or how to display it. If you're thinking | |
485 | of using it for any other purpose, it is quite likely that you're | |
486 | making a mistake. Think: what do you want to do when the command is | |
487 | called from a keyboard macro? | |
488 | ||
84b17ab0 CY |
489 | To test whether your function was called with `call-interactively', |
490 | either (i) add an extra optional argument and give it an `interactive' | |
491 | spec that specifies non-nil unconditionally (such as \"p\"); or (ii) | |
492 | use `called-interactively-p'. */) | |
5842a27b | 493 | (void) |
db9f0278 | 494 | { |
c63df42b | 495 | return (INTERACTIVE && interactive_p (1)) ? Qt : Qnil; |
e0f331ab GM |
496 | } |
497 | ||
498 | ||
9d28c33e | 499 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 1, 0, |
84b17ab0 | 500 | doc: /* Return t if the containing function was called by `call-interactively'. |
9d28c33e SM |
501 | If KIND is `interactive', then only return t if the call was made |
502 | interactively by the user, i.e. not in `noninteractive' mode nor | |
503 | when `executing-kbd-macro'. | |
504 | If KIND is `any', on the other hand, it will return t for any kind of | |
505 | interactive call, including being called as the binding of a key, or | |
506 | from a keyboard macro, or in `noninteractive' mode. | |
507 | ||
508 | The only known proper use of `interactive' for KIND is in deciding | |
509 | whether to display a helpful message, or how to display it. If you're | |
510 | thinking of using it for any other purpose, it is quite likely that | |
511 | you're making a mistake. Think: what do you want to do when the | |
512 | command is called from a keyboard macro? | |
84b17ab0 CY |
513 | |
514 | This function is meant for implementing advice and other | |
515 | function-modifying features. Instead of using this, it is sometimes | |
516 | cleaner to give your function an extra optional argument whose | |
517 | `interactive' spec specifies non-nil unconditionally (\"p\" is a good | |
9d28c33e | 518 | way to do this), or via (not (or executing-kbd-macro noninteractive)). */) |
5842a27b | 519 | (Lisp_Object kind) |
c63df42b | 520 | { |
9d28c33e SM |
521 | return ((INTERACTIVE || !EQ (kind, intern ("interactive"))) |
522 | && interactive_p (1)) ? Qt : Qnil; | |
c63df42b RS |
523 | } |
524 | ||
525 | ||
526 | /* Return 1 if function in which this appears was called using | |
527 | call-interactively. | |
e0f331ab GM |
528 | |
529 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
530 | called is a built-in. */ | |
531 | ||
2f7c71a1 | 532 | static int |
d3da34e0 | 533 | interactive_p (int exclude_subrs_p) |
e0f331ab GM |
534 | { |
535 | struct backtrace *btp; | |
536 | Lisp_Object fun; | |
db9f0278 | 537 | |
db9f0278 | 538 | btp = backtrace_list; |
daa37602 JB |
539 | |
540 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 541 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 542 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
543 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
544 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 545 | btp = btp->next; |
daa37602 JB |
546 | |
547 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
548 | may be a frame for Fbytecode at the top level. In any version of |
549 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
550 | inside catch and condition-case. Skip past them. | |
daa37602 | 551 | |
4402a9ed | 552 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 553 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
554 | while (btp |
555 | && (EQ (*btp->function, Qbytecode) | |
c5101a77 | 556 | || btp->nargs == (size_t) UNEVALLED)) |
a6e3fa71 JB |
557 | btp = btp->next; |
558 | ||
daa37602 JB |
559 | /* btp now points at the frame of the innermost function that isn't |
560 | a special form, ignoring frames for Finteractive_p and/or | |
561 | Fbytecode at the top. If this frame is for a built-in function | |
562 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 563 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
564 | if (exclude_subrs_p && SUBRP (fun)) |
565 | return 0; | |
177c0ea7 | 566 | |
db9f0278 JB |
567 | /* btp points to the frame of a Lisp function that called interactive-p. |
568 | Return t if that function was called interactively. */ | |
569 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
570 | return 1; |
571 | return 0; | |
db9f0278 JB |
572 | } |
573 | ||
e0f331ab | 574 | |
db9f0278 | 575 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
576 | doc: /* Define NAME as a function. |
577 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
578 | See also the function `interactive'. | |
7a25dc6d | 579 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
5842a27b | 580 | (Lisp_Object args) |
db9f0278 JB |
581 | { |
582 | register Lisp_Object fn_name; | |
583 | register Lisp_Object defn; | |
584 | ||
585 | fn_name = Fcar (args); | |
6992a868 | 586 | CHECK_SYMBOL (fn_name); |
db9f0278 | 587 | defn = Fcons (Qlambda, Fcdr (args)); |
265a9e55 | 588 | if (!NILP (Vpurify_flag)) |
db9f0278 | 589 | defn = Fpurecopy (defn); |
f58e9f8c RS |
590 | if (CONSP (XSYMBOL (fn_name)->function) |
591 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
592 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 593 | Ffset (fn_name, defn); |
6fd797f5 | 594 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
595 | return fn_name; |
596 | } | |
597 | ||
598 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 599 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
600 | The actual definition looks like |
601 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
602 | When the macro is called, as in (NAME ARGS...), |
603 | the function (lambda ARGLIST BODY...) is applied to | |
604 | the list ARGS... as it appears in the expression, | |
605 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
606 | |
607 | DECL is a declaration, optional, which can specify how to indent | |
4ba50634 JPW |
608 | calls to this macro, how Edebug should handle it, and which argument |
609 | should be treated as documentation. It looks like this: | |
0654d6e3 RS |
610 | (declare SPECS...) |
611 | The elements can look like this: | |
612 | (indent INDENT) | |
613 | Set NAME's `lisp-indent-function' property to INDENT. | |
614 | ||
e509f168 | 615 | (debug DEBUG) |
0654d6e3 | 616 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 617 | equivalent to writing a `def-edebug-spec' for the macro.) |
4ba50634 JPW |
618 | |
619 | (doc-string ELT) | |
620 | Set NAME's `doc-string-elt' property to ELT. | |
621 | ||
0654d6e3 | 622 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
5842a27b | 623 | (Lisp_Object args) |
db9f0278 JB |
624 | { |
625 | register Lisp_Object fn_name; | |
626 | register Lisp_Object defn; | |
d6edd563 | 627 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
628 | |
629 | fn_name = Fcar (args); | |
8e975df9 | 630 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
631 | lambda_list = Fcar (Fcdr (args)); |
632 | tail = Fcdr (Fcdr (args)); | |
633 | ||
634 | doc = Qnil; | |
635 | if (STRINGP (Fcar (tail))) | |
636 | { | |
e509f168 SM |
637 | doc = XCAR (tail); |
638 | tail = XCDR (tail); | |
d6edd563 GM |
639 | } |
640 | ||
0193499f SM |
641 | if (CONSP (Fcar (tail)) |
642 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
d6edd563 GM |
643 | { |
644 | if (!NILP (Vmacro_declaration_function)) | |
645 | { | |
646 | struct gcpro gcpro1; | |
647 | GCPRO1 (args); | |
648 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
649 | UNGCPRO; | |
650 | } | |
177c0ea7 | 651 | |
d6edd563 GM |
652 | tail = Fcdr (tail); |
653 | } | |
654 | ||
655 | if (NILP (doc)) | |
656 | tail = Fcons (lambda_list, tail); | |
657 | else | |
658 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
659 | defn = Fcons (Qmacro, Fcons (Qlambda, tail)); | |
177c0ea7 | 660 | |
265a9e55 | 661 | if (!NILP (Vpurify_flag)) |
db9f0278 | 662 | defn = Fpurecopy (defn); |
f58e9f8c RS |
663 | if (CONSP (XSYMBOL (fn_name)->function) |
664 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
665 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 666 | Ffset (fn_name, defn); |
6fd797f5 | 667 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
668 | return fn_name; |
669 | } | |
670 | ||
19cebf5a | 671 | |
1848d15d | 672 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 673 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 674 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 675 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
676 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
677 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
678 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
679 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 680 | The return value is BASE-VARIABLE. */) |
5842a27b | 681 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
682 | { |
683 | struct Lisp_Symbol *sym; | |
1848d15d | 684 | |
4a9308b8 JB |
685 | CHECK_SYMBOL (new_alias); |
686 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 687 | |
4a9308b8 | 688 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
689 | |
690 | if (sym->constant) | |
178f2507 SM |
691 | /* Not sure why, but why not? */ |
692 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
693 | |
694 | switch (sym->redirect) | |
695 | { | |
696 | case SYMBOL_FORWARDED: | |
697 | error ("Cannot make an internal variable an alias"); | |
698 | case SYMBOL_LOCALIZED: | |
699 | error ("Don't know how to make a localized variable an alias"); | |
700 | } | |
701 | ||
dd60787c | 702 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
703 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
704 | so that old-code that affects n_a before the aliasing is setup | |
705 | still works. */ | |
706 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 707 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
708 | |
709 | { | |
710 | struct specbinding *p; | |
711 | ||
712 | for (p = specpdl_ptr - 1; p >= specpdl; p--) | |
713 | if (p->func == NULL | |
714 | && (EQ (new_alias, | |
715 | CONSP (p->symbol) ? XCAR (p->symbol) : p->symbol))) | |
716 | error ("Don't know how to make a let-bound variable an alias"); | |
717 | } | |
718 | ||
719 | sym->redirect = SYMBOL_VARALIAS; | |
720 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
721 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
722 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
723 | /* Even if docstring is nil: remove old docstring. */ |
724 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 725 | |
4a9308b8 | 726 | return base_variable; |
19cebf5a GM |
727 | } |
728 | ||
729 | ||
db9f0278 | 730 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 731 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
732 | You are not required to define a variable in order to use it, |
733 | but the definition can supply documentation and an initial value | |
734 | in a way that tags can recognize. | |
735 | ||
736 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
737 | If SYMBOL is buffer-local, its default value is what is set; | |
738 | buffer-local values are not affected. | |
739 | INITVALUE and DOCSTRING are optional. | |
740 | If DOCSTRING starts with *, this variable is identified as a user option. | |
741 | This means that M-x set-variable recognizes it. | |
742 | See also `user-variable-p'. | |
743 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
744 | |
745 | If SYMBOL has a local binding, then this form affects the local | |
746 | binding. This is usually not what you want. Thus, if you need to | |
747 | load a file defining variables, with this form or with `defconst' or | |
748 | `defcustom', you should always load that file _outside_ any bindings | |
749 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
750 | this respect.) | |
2df5238c | 751 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 752 | (Lisp_Object args) |
db9f0278 | 753 | { |
a42ba017 | 754 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
755 | |
756 | sym = Fcar (args); | |
a42ba017 RS |
757 | tail = Fcdr (args); |
758 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 759 | error ("Too many arguments"); |
a42ba017 | 760 | |
33568849 | 761 | tem = Fdefault_boundp (sym); |
a42ba017 | 762 | if (!NILP (tail)) |
db9f0278 | 763 | { |
1c9916a1 SM |
764 | if (SYMBOL_CONSTANT_P (sym)) |
765 | { | |
766 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
1faed8ae PE |
767 | Lisp_Object tem1 = Fcar (tail); |
768 | if (! (CONSP (tem1) | |
769 | && EQ (XCAR (tem1), Qquote) | |
770 | && CONSP (XCDR (tem1)) | |
771 | && EQ (XCAR (XCDR (tem1)), sym))) | |
1c9916a1 SM |
772 | error ("Constant symbol `%s' specified in defvar", |
773 | SDATA (SYMBOL_NAME (sym))); | |
774 | } | |
775 | ||
265a9e55 | 776 | if (NILP (tem)) |
33568849 | 777 | Fset_default (sym, Feval (Fcar (tail))); |
d0bce91e SM |
778 | else |
779 | { /* Check if there is really a global binding rather than just a let | |
780 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 781 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
782 | while (--pdl >= specpdl) |
783 | { | |
784 | if (EQ (pdl->symbol, sym) && !pdl->func | |
785 | && EQ (pdl->old_value, Qunbound)) | |
786 | { | |
787 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
788 | SYMBOL_NAME (sym), 1); | |
789 | break; | |
790 | } | |
791 | } | |
792 | } | |
33568849 | 793 | tail = Fcdr (tail); |
e509f168 SM |
794 | tem = Fcar (tail); |
795 | if (!NILP (tem)) | |
33568849 | 796 | { |
33568849 SM |
797 | if (!NILP (Vpurify_flag)) |
798 | tem = Fpurecopy (tem); | |
799 | Fput (sym, Qvariable_documentation, tem); | |
800 | } | |
6fd797f5 | 801 | LOADHIST_ATTACH (sym); |
db9f0278 | 802 | } |
33568849 | 803 | else |
d28a2170 PE |
804 | { |
805 | /* Simple (defvar <var>) should not count as a definition at all. | |
806 | It could get in the way of other definitions, and unloading this | |
807 | package could try to make the variable unbound. */ | |
808 | } | |
addf35fd | 809 | |
db9f0278 JB |
810 | return sym; |
811 | } | |
812 | ||
813 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
814 | doc: /* Define SYMBOL as a constant variable. |
815 | The intent is that neither programs nor users should ever change this value. | |
816 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
817 | If SYMBOL is buffer-local, its default value is what is set; | |
818 | buffer-local values are not affected. | |
819 | DOCSTRING is optional. | |
733f68b6 LT |
820 | |
821 | If SYMBOL has a local binding, then this form sets the local binding's | |
822 | value. However, you should normally not make local bindings for | |
823 | variables defined with this form. | |
7a25dc6d | 824 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 825 | (Lisp_Object args) |
db9f0278 JB |
826 | { |
827 | register Lisp_Object sym, tem; | |
828 | ||
829 | sym = Fcar (args); | |
a42ba017 | 830 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 831 | error ("Too many arguments"); |
a42ba017 | 832 | |
1182a7cb DL |
833 | tem = Feval (Fcar (Fcdr (args))); |
834 | if (!NILP (Vpurify_flag)) | |
835 | tem = Fpurecopy (tem); | |
836 | Fset_default (sym, tem); | |
db9f0278 | 837 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 838 | if (!NILP (tem)) |
db9f0278 | 839 | { |
265a9e55 | 840 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
841 | tem = Fpurecopy (tem); |
842 | Fput (sym, Qvariable_documentation, tem); | |
843 | } | |
873759d5 | 844 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 845 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
846 | return sym; |
847 | } | |
848 | ||
606cdb89 JB |
849 | /* Error handler used in Fuser_variable_p. */ |
850 | static Lisp_Object | |
d3da34e0 | 851 | user_variable_p_eh (Lisp_Object ignore) |
606cdb89 JB |
852 | { |
853 | return Qnil; | |
854 | } | |
855 | ||
40a69fac SM |
856 | static Lisp_Object |
857 | lisp_indirect_variable (Lisp_Object sym) | |
858 | { | |
cfcbfb1a PE |
859 | struct Lisp_Symbol *s = indirect_variable (XSYMBOL (sym)); |
860 | XSETSYMBOL (sym, s); | |
40a69fac SM |
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 (); |
c5101a77 | 962 | register size_t argnum; |
db9f0278 | 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 | |
c5101a77 PE |
1514 | internal_condition_case_n (Lisp_Object (*bfun) (size_t, Lisp_Object *), |
1515 | size_t nargs, | |
178f2507 SM |
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); |
e7f7fbaa SM |
1562 | static int maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1563 | Lisp_Object data); | |
db9f0278 JB |
1564 | |
1565 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
9dbc9081 PJ |
1566 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1567 | This function does not return. | |
1568 | ||
1569 | An error symbol is a symbol with an `error-conditions' property | |
1570 | that is a list of condition names. | |
1571 | A handler for any of those names will get to handle this signal. | |
1572 | The symbol `error' should normally be one of them. | |
1573 | ||
1574 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1575 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1576 | error message is constructed. | |
9dbc9081 PJ |
1577 | If the signal is handled, DATA is made available to the handler. |
1578 | See also the function `condition-case'. */) | |
5842a27b | 1579 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1580 | { |
bfa8ca43 | 1581 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1582 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1583 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1584 | Lisp_Object conditions; |
c11d3d17 | 1585 | Lisp_Object string; |
e7f7fbaa SM |
1586 | Lisp_Object real_error_symbol |
1587 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1588 | register Lisp_Object clause = Qnil; | |
1589 | struct handler *h; | |
a2ff3819 | 1590 | struct backtrace *bp; |
db9f0278 | 1591 | |
346598f1 | 1592 | immediate_quit = handling_signal = 0; |
d063129f | 1593 | abort_on_gc = 0; |
db9f0278 JB |
1594 | if (gc_in_progress || waiting_for_input) |
1595 | abort (); | |
1596 | ||
26631f2b RS |
1597 | #if 0 /* rms: I don't know why this was here, |
1598 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1599 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1600 | if (display_hourglass_p) |
1601 | cancel_hourglass (); | |
48f8dfa3 | 1602 | #endif |
177c0ea7 | 1603 | #endif |
48f8dfa3 | 1604 | |
61ede770 | 1605 | /* This hook is used by edebug. */ |
26631f2b RS |
1606 | if (! NILP (Vsignal_hook_function) |
1607 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1608 | { |
1609 | /* Edebug takes care of restoring these variables when it exits. */ | |
1610 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1611 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1612 | ||
1613 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1614 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1615 | ||
1616 | call2 (Vsignal_hook_function, error_symbol, data); | |
1617 | } | |
61ede770 | 1618 | |
1ea9dec4 | 1619 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1620 | |
a2ff3819 GM |
1621 | /* Remember from where signal was called. Skip over the frame for |
1622 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1623 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1624 | is a memory-full error. */ | |
090a072f | 1625 | Vsignaling_function = Qnil; |
26631f2b | 1626 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1627 | { |
1628 | bp = backtrace_list->next; | |
1629 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1630 | bp = bp->next; | |
1631 | if (bp && bp->function) | |
1632 | Vsignaling_function = *bp->function; | |
1633 | } | |
a2ff3819 | 1634 | |
e7f7fbaa | 1635 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1636 | { |
e7f7fbaa | 1637 | clause = find_handler_clause (h->handler, conditions, |
f01cbfdd | 1638 | error_symbol, data); |
265a9e55 | 1639 | if (!NILP (clause)) |
e7f7fbaa | 1640 | break; |
db9f0278 | 1641 | } |
475545b5 | 1642 | |
e7f7fbaa SM |
1643 | if (/* Don't run the debugger for a memory-full error. |
1644 | (There is no room in memory to do that!) */ | |
1645 | !NILP (error_symbol) | |
1646 | && (!NILP (Vdebug_on_signal) | |
1647 | /* If no handler is present now, try to run the debugger. */ | |
1648 | || NILP (clause) | |
1649 | /* Special handler that means "print a message and run debugger | |
1650 | if requested". */ | |
1651 | || EQ (h->handler, Qerror))) | |
1652 | { | |
1653 | int debugger_called | |
1654 | = maybe_call_debugger (conditions, error_symbol, data); | |
1655 | /* We can't return values to code which signaled an error, but we | |
1656 | can continue code which has signaled a quit. */ | |
1657 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
1658 | return Qnil; | |
475545b5 | 1659 | } |
db9f0278 | 1660 | |
e7f7fbaa SM |
1661 | if (!NILP (clause)) |
1662 | { | |
1663 | Lisp_Object unwind_data | |
1664 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 1665 | |
e7f7fbaa SM |
1666 | h->chosen_clause = clause; |
1667 | unwind_to_catch (h->tag, unwind_data); | |
1668 | } | |
1669 | else | |
1670 | { | |
1671 | if (catchlist != 0) | |
1672 | Fthrow (Qtop_level, Qt); | |
1673 | } | |
c11d3d17 | 1674 | |
1ea9dec4 | 1675 | if (! NILP (error_symbol)) |
c11d3d17 | 1676 | data = Fcons (error_symbol, data); |
475545b5 | 1677 | |
c11d3d17 | 1678 | string = Ferror_message_string (data); |
d5db4077 | 1679 | fatal ("%s", SDATA (string), 0); |
db9f0278 JB |
1680 | } |
1681 | ||
734d55a2 KS |
1682 | /* Internal version of Fsignal that never returns. |
1683 | Used for anything but Qquit (which can return from Fsignal). */ | |
1684 | ||
1685 | void | |
d3da34e0 | 1686 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1687 | { |
1688 | Fsignal (error_symbol, data); | |
1689 | abort (); | |
1690 | } | |
1691 | ||
1692 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1693 | ||
1694 | void | |
d3da34e0 | 1695 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1696 | { |
1697 | xsignal (error_symbol, Qnil); | |
1698 | } | |
1699 | ||
1700 | void | |
d3da34e0 | 1701 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1702 | { |
1703 | xsignal (error_symbol, list1 (arg)); | |
1704 | } | |
1705 | ||
1706 | void | |
d3da34e0 | 1707 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1708 | { |
1709 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1710 | } | |
1711 | ||
1712 | void | |
d3da34e0 | 1713 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1714 | { |
1715 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1716 | } | |
1717 | ||
1718 | /* Signal `error' with message S, and additional arg ARG. | |
1719 | If ARG is not a genuine list, make it a one-element list. */ | |
1720 | ||
1721 | void | |
a8fe7202 | 1722 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1723 | { |
1724 | Lisp_Object tortoise, hare; | |
1725 | ||
1726 | hare = tortoise = arg; | |
1727 | while (CONSP (hare)) | |
1728 | { | |
1729 | hare = XCDR (hare); | |
1730 | if (!CONSP (hare)) | |
1731 | break; | |
1732 | ||
1733 | hare = XCDR (hare); | |
1734 | tortoise = XCDR (tortoise); | |
1735 | ||
1736 | if (EQ (hare, tortoise)) | |
1737 | break; | |
1738 | } | |
1739 | ||
1740 | if (!NILP (hare)) | |
1741 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1742 | ||
1743 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1744 | } | |
1745 | ||
1746 | ||
e0f24100 | 1747 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1748 | a list containing one of CONDITIONS. */ |
1749 | ||
1750 | static int | |
d3da34e0 | 1751 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1752 | { |
4de86b16 | 1753 | if (NILP (list)) |
128c0f66 RM |
1754 | return 0; |
1755 | if (! CONSP (list)) | |
1756 | return 1; | |
1757 | ||
ab67260b | 1758 | while (CONSP (conditions)) |
128c0f66 | 1759 | { |
ab67260b | 1760 | Lisp_Object this, tail; |
03699b14 KR |
1761 | this = XCAR (conditions); |
1762 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1763 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1764 | return 1; |
03699b14 | 1765 | conditions = XCDR (conditions); |
128c0f66 | 1766 | } |
ab67260b | 1767 | return 0; |
128c0f66 RM |
1768 | } |
1769 | ||
fc950e09 KH |
1770 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1771 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1772 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1773 | |
1774 | static int | |
d3da34e0 | 1775 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1776 | { |
1777 | Lisp_Object tail; | |
1778 | int first_string = 1; | |
1779 | Lisp_Object error_message; | |
1780 | ||
17401c97 GM |
1781 | error_message = Qnil; |
1782 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1783 | { |
03699b14 | 1784 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1785 | { |
1786 | if (first_string) | |
1787 | { | |
1788 | error_message = Ferror_message_string (data); | |
1789 | first_string = 0; | |
1790 | } | |
177c0ea7 | 1791 | |
03699b14 | 1792 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1793 | return 1; |
1794 | } | |
1795 | else | |
1796 | { | |
1797 | Lisp_Object contail; | |
1798 | ||
17401c97 | 1799 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1800 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1801 | return 1; |
1802 | } | |
1803 | } | |
1804 | ||
1805 | return 0; | |
1806 | } | |
1807 | ||
ddaa36e1 AS |
1808 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
1809 | SIG and DATA describe the signal, as in find_handler_clause. */ | |
1810 | ||
1811 | static int | |
d3da34e0 | 1812 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1813 | { |
1814 | Lisp_Object combined_data; | |
1815 | ||
1816 | combined_data = Fcons (sig, data); | |
1817 | ||
1818 | if ( | |
1819 | /* Don't try to run the debugger with interrupts blocked. | |
1820 | The editing loop would return anyway. */ | |
1821 | ! INPUT_BLOCKED_P | |
1822 | /* Does user want to enter debugger for this kind of error? */ | |
1823 | && (EQ (sig, Qquit) | |
1824 | ? debug_on_quit | |
1825 | : wants_debugger (Vdebug_on_error, conditions)) | |
1826 | && ! skip_debugger (conditions, combined_data) | |
1827 | /* rms: what's this for? */ | |
1828 | && when_entered_debugger < num_nonmacro_input_events) | |
1829 | { | |
1830 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1831 | return 1; | |
1832 | } | |
1833 | ||
1834 | return 0; | |
1835 | } | |
1836 | ||
128c0f66 | 1837 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1838 | There are two ways to pass SIG and DATA: |
9b942ebd | 1839 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1840 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1841 | This is for memory-full errors only. |
1ea9dec4 | 1842 | |
9f5903bb RS |
1843 | We need to increase max_specpdl_size temporarily around |
1844 | anything we do that can push on the specpdl, so as not to get | |
1845 | a second error here in case we're handling specpdl overflow. */ | |
db9f0278 JB |
1846 | |
1847 | static Lisp_Object | |
d3da34e0 JB |
1848 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions, |
1849 | Lisp_Object sig, Lisp_Object data) | |
db9f0278 JB |
1850 | { |
1851 | register Lisp_Object h; | |
db9f0278 | 1852 | |
f01cbfdd RS |
1853 | /* t is used by handlers for all conditions, set up by C code. */ |
1854 | if (EQ (handlers, Qt)) | |
db9f0278 | 1855 | return Qt; |
f01cbfdd | 1856 | |
61ede770 RS |
1857 | /* error is used similarly, but means print an error message |
1858 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1859 | if (EQ (handlers, Qerror)) |
1860 | return Qt; | |
f01cbfdd | 1861 | |
e7f7fbaa | 1862 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1863 | { |
e7f7fbaa SM |
1864 | Lisp_Object handler = XCAR (h); |
1865 | Lisp_Object condit, tem; | |
5f96776a | 1866 | |
5f96776a | 1867 | if (!CONSP (handler)) |
db9f0278 | 1868 | continue; |
e7f7fbaa | 1869 | condit = XCAR (handler); |
5f96776a RS |
1870 | /* Handle a single condition name in handler HANDLER. */ |
1871 | if (SYMBOLP (condit)) | |
1872 | { | |
1873 | tem = Fmemq (Fcar (handler), conditions); | |
1874 | if (!NILP (tem)) | |
1875 | return handler; | |
1876 | } | |
1877 | /* Handle a list of condition names in handler HANDLER. */ | |
1878 | else if (CONSP (condit)) | |
1879 | { | |
f01cbfdd RS |
1880 | Lisp_Object tail; |
1881 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1882 | { |
e7f7fbaa | 1883 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1884 | if (!NILP (tem)) |
e7f7fbaa | 1885 | return handler; |
5f96776a RS |
1886 | } |
1887 | } | |
db9f0278 | 1888 | } |
f01cbfdd | 1889 | |
db9f0278 JB |
1890 | return Qnil; |
1891 | } | |
1892 | ||
db9f0278 | 1893 | |
b3ffc17c | 1894 | /* dump an error message; called like vprintf */ |
db9f0278 | 1895 | void |
b3ffc17c | 1896 | verror (const char *m, va_list ap) |
db9f0278 JB |
1897 | { |
1898 | char buf[200]; | |
5816888b | 1899 | EMACS_INT size = 200; |
9125da08 RS |
1900 | int mlen; |
1901 | char *buffer = buf; | |
9125da08 RS |
1902 | int allocated = 0; |
1903 | Lisp_Object string; | |
1904 | ||
9125da08 | 1905 | mlen = strlen (m); |
db9f0278 JB |
1906 | |
1907 | while (1) | |
9125da08 | 1908 | { |
db063399 | 1909 | EMACS_INT used; |
6a8033e1 | 1910 | used = doprnt (buffer, size, m, m + mlen, ap); |
9125da08 RS |
1911 | if (used < size) |
1912 | break; | |
1913 | size *= 2; | |
1914 | if (allocated) | |
1915 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
1916 | else |
1917 | { | |
1918 | buffer = (char *) xmalloc (size); | |
1919 | allocated = 1; | |
1920 | } | |
9125da08 RS |
1921 | } |
1922 | ||
955f3ff9 | 1923 | string = build_string (buffer); |
9125da08 | 1924 | if (allocated) |
9ae6734f | 1925 | xfree (buffer); |
9125da08 | 1926 | |
734d55a2 | 1927 | xsignal1 (Qerror, string); |
db9f0278 | 1928 | } |
b3ffc17c DN |
1929 | |
1930 | ||
1931 | /* dump an error message; called like printf */ | |
1932 | ||
1933 | /* VARARGS 1 */ | |
1934 | void | |
1935 | error (const char *m, ...) | |
1936 | { | |
1937 | va_list ap; | |
1938 | va_start (ap, m); | |
1939 | verror (m, ap); | |
1940 | va_end (ap); | |
1941 | } | |
db9f0278 | 1942 | \f |
e72706be | 1943 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
1944 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
1945 | This means it contains a description for how to read arguments to give it. | |
1946 | The value is nil for an invalid function or a symbol with no function | |
1947 | definition. | |
1948 | ||
1949 | Interactively callable functions include strings and vectors (treated | |
1950 | as keyboard macros), lambda-expressions that contain a top-level call | |
1951 | to `interactive', autoload definitions made by `autoload' with non-nil | |
1952 | fourth argument, and some of the built-in functions of Lisp. | |
1953 | ||
e72706be RS |
1954 | Also, a symbol satisfies `commandp' if its function definition does so. |
1955 | ||
1956 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 1957 | then strings and vectors are not accepted. */) |
5842a27b | 1958 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
1959 | { |
1960 | register Lisp_Object fun; | |
1961 | register Lisp_Object funcar; | |
52b71f49 | 1962 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
1963 | |
1964 | fun = function; | |
1965 | ||
52b71f49 SM |
1966 | fun = indirect_function (fun); /* Check cycles. */ |
1967 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 1968 | return Qnil; |
db9f0278 | 1969 | |
52b71f49 SM |
1970 | /* Check an `interactive-form' property if present, analogous to the |
1971 | function-documentation property. */ | |
1972 | fun = function; | |
1973 | while (SYMBOLP (fun)) | |
1974 | { | |
2b9aa051 | 1975 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
1976 | if (!NILP (tmp)) |
1977 | if_prop = Qt; | |
1978 | fun = Fsymbol_function (fun); | |
1979 | } | |
1980 | ||
db9f0278 JB |
1981 | /* Emacs primitives are interactive if their DEFUN specifies an |
1982 | interactive spec. */ | |
90165123 | 1983 | if (SUBRP (fun)) |
04724b69 | 1984 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
1985 | |
1986 | /* Bytecode objects are interactive if they are long enough to | |
1987 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1988 | where the interactive spec is stored. */ | |
90165123 | 1989 | else if (COMPILEDP (fun)) |
845975f5 | 1990 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 1991 | ? Qt : if_prop); |
db9f0278 JB |
1992 | |
1993 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 1994 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 1995 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
1996 | |
1997 | /* Lists may represent commands. */ | |
1998 | if (!CONSP (fun)) | |
1999 | return Qnil; | |
ed16fb98 | 2000 | funcar = XCAR (fun); |
db9f0278 | 2001 | if (EQ (funcar, Qlambda)) |
52b71f49 | 2002 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
db9f0278 | 2003 | if (EQ (funcar, Qautoload)) |
52b71f49 | 2004 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2005 | else |
2006 | return Qnil; | |
2007 | } | |
2008 | ||
db9f0278 | 2009 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
2010 | doc: /* Define FUNCTION to autoload from FILE. |
2011 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2012 | Third arg DOCSTRING is documentation for the function. | |
2013 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2014 | Fifth arg TYPE indicates the type of the object: | |
2015 | nil or omitted says FUNCTION is a function, | |
2016 | `keymap' says FUNCTION is really a keymap, and | |
2017 | `macro' or t says FUNCTION is really a macro. | |
2018 | Third through fifth args give info about the real definition. | |
2019 | They default to nil. | |
2020 | If FUNCTION is already defined other than as an autoload, | |
2021 | this does nothing and returns nil. */) | |
5842a27b | 2022 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 2023 | { |
b7826503 PJ |
2024 | CHECK_SYMBOL (function); |
2025 | CHECK_STRING (file); | |
db9f0278 JB |
2026 | |
2027 | /* If function is defined and not as an autoload, don't override */ | |
2028 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 2029 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2030 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2031 | return Qnil; |
2032 | ||
7973e637 SM |
2033 | if (NILP (Vpurify_flag)) |
2034 | /* Only add entries after dumping, because the ones before are | |
2035 | not useful and else we get loads of them from the loaddefs.el. */ | |
2036 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
905a9ed3 | 2037 | else |
a56eaaef | 2038 | /* We don't want the docstring in purespace (instead, |
d6d23852 SM |
2039 | Snarf-documentation should (hopefully) overwrite it). |
2040 | We used to use 0 here, but that leads to accidental sharing in | |
2041 | purecopy's hash-consing, so we use a (hopefully) unique integer | |
2042 | instead. */ | |
2043 | docstring = make_number (XHASH (function)); | |
a56eaaef DN |
2044 | return Ffset (function, |
2045 | Fpurecopy (list5 (Qautoload, file, docstring, | |
2046 | interactive, type))); | |
db9f0278 JB |
2047 | } |
2048 | ||
2049 | Lisp_Object | |
d3da34e0 | 2050 | un_autoload (Lisp_Object oldqueue) |
db9f0278 JB |
2051 | { |
2052 | register Lisp_Object queue, first, second; | |
2053 | ||
2054 | /* Queue to unwind is current value of Vautoload_queue. | |
2055 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2056 | queue = Vautoload_queue; | |
2057 | Vautoload_queue = oldqueue; | |
2058 | while (CONSP (queue)) | |
2059 | { | |
e509f168 | 2060 | first = XCAR (queue); |
db9f0278 JB |
2061 | second = Fcdr (first); |
2062 | first = Fcar (first); | |
47b82df9 RS |
2063 | if (EQ (first, make_number (0))) |
2064 | Vfeatures = second; | |
db9f0278 JB |
2065 | else |
2066 | Ffset (first, second); | |
e509f168 | 2067 | queue = XCDR (queue); |
db9f0278 JB |
2068 | } |
2069 | return Qnil; | |
2070 | } | |
2071 | ||
ca20916b RS |
2072 | /* Load an autoloaded function. |
2073 | FUNNAME is the symbol which is the function's name. | |
2074 | FUNDEF is the autoload definition (a list). */ | |
2075 | ||
045ba794 | 2076 | void |
d3da34e0 | 2077 | do_autoload (Lisp_Object fundef, Lisp_Object funname) |
db9f0278 | 2078 | { |
aed13378 | 2079 | int count = SPECPDL_INDEX (); |
d945992e | 2080 | Lisp_Object fun; |
ca20916b | 2081 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2082 | |
aea6173f RS |
2083 | /* This is to make sure that loadup.el gives a clear picture |
2084 | of what files are preloaded and when. */ | |
ab4db096 RS |
2085 | if (! NILP (Vpurify_flag)) |
2086 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2087 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2088 | |
db9f0278 | 2089 | fun = funname; |
b7826503 | 2090 | CHECK_SYMBOL (funname); |
ca20916b | 2091 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2092 | |
f87740dc | 2093 | /* Preserve the match data. */ |
89f2614d | 2094 | record_unwind_save_match_data (); |
177c0ea7 | 2095 | |
a04ee161 RS |
2096 | /* If autoloading gets an error (which includes the error of failing |
2097 | to define the function being called), we use Vautoload_queue | |
2098 | to undo function definitions and `provide' calls made by | |
2099 | the function. We do this in the specific case of autoloading | |
2100 | because autoloading is not an explicit request "load this file", | |
2101 | but rather a request to "call this function". | |
d3da34e0 | 2102 | |
a04ee161 | 2103 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
2104 | record_unwind_protect (un_autoload, Vautoload_queue); |
2105 | Vautoload_queue = Qt; | |
7351b242 | 2106 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2107 | |
db9f0278 JB |
2108 | /* Once loading finishes, don't undo it. */ |
2109 | Vautoload_queue = Qt; | |
2110 | unbind_to (count, Qnil); | |
2111 | ||
a7f96a35 | 2112 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2113 | |
76c2b0cc | 2114 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2115 | error ("Autoloading failed to define function %s", |
d5db4077 | 2116 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2117 | UNGCPRO; |
db9f0278 | 2118 | } |
4c576a83 | 2119 | |
db9f0278 JB |
2120 | \f |
2121 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
9dbc9081 | 2122 | doc: /* Evaluate FORM and return its value. */) |
5842a27b | 2123 | (Lisp_Object form) |
db9f0278 JB |
2124 | { |
2125 | Lisp_Object fun, val, original_fun, original_args; | |
2126 | Lisp_Object funcar; | |
2127 | struct backtrace backtrace; | |
2128 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2129 | ||
df470e3b | 2130 | if (handling_signal) |
48f8dfa3 | 2131 | abort (); |
177c0ea7 | 2132 | |
90165123 | 2133 | if (SYMBOLP (form)) |
2b9bde76 | 2134 | return Fsymbol_value (form); |
db9f0278 JB |
2135 | if (!CONSP (form)) |
2136 | return form; | |
2137 | ||
2138 | QUIT; | |
ee830945 RS |
2139 | if ((consing_since_gc > gc_cons_threshold |
2140 | && consing_since_gc > gc_relative_threshold) | |
2141 | || | |
2142 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2143 | { |
2144 | GCPRO1 (form); | |
2145 | Fgarbage_collect (); | |
2146 | UNGCPRO; | |
2147 | } | |
2148 | ||
2149 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2150 | { | |
2151 | if (max_lisp_eval_depth < 100) | |
2152 | max_lisp_eval_depth = 100; | |
2153 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2154 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2155 | } |
2156 | ||
2157 | original_fun = Fcar (form); | |
2158 | original_args = Fcdr (form); | |
2159 | ||
2160 | backtrace.next = backtrace_list; | |
2161 | backtrace_list = &backtrace; | |
2162 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
2163 | backtrace.args = &original_args; | |
2164 | backtrace.nargs = UNEVALLED; | |
2165 | backtrace.evalargs = 1; | |
2166 | backtrace.debug_on_exit = 0; | |
2167 | ||
2168 | if (debug_on_next_call) | |
2169 | do_debug_on_call (Qt); | |
2170 | ||
2171 | /* At this point, only original_fun and original_args | |
2172 | have values that will be used below */ | |
2173 | retry: | |
8788120f KS |
2174 | |
2175 | /* Optimize for no indirection. */ | |
2176 | fun = original_fun; | |
2177 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2178 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2179 | fun = indirect_function (fun); | |
db9f0278 | 2180 | |
90165123 | 2181 | if (SUBRP (fun)) |
db9f0278 JB |
2182 | { |
2183 | Lisp_Object numargs; | |
166c822d | 2184 | Lisp_Object argvals[8]; |
db9f0278 JB |
2185 | Lisp_Object args_left; |
2186 | register int i, maxargs; | |
2187 | ||
2188 | args_left = original_args; | |
2189 | numargs = Flength (args_left); | |
2190 | ||
c1788fbc RS |
2191 | CHECK_CONS_LIST (); |
2192 | ||
db9f0278 JB |
2193 | if (XINT (numargs) < XSUBR (fun)->min_args || |
2194 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2195 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2196 | |
ef1b0ba7 | 2197 | else if (XSUBR (fun)->max_args == UNEVALLED) |
db9f0278 JB |
2198 | { |
2199 | backtrace.evalargs = 0; | |
d5273788 | 2200 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
db9f0278 | 2201 | } |
ef1b0ba7 | 2202 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 JB |
2203 | { |
2204 | /* Pass a vector of evaluated arguments */ | |
2205 | Lisp_Object *vals; | |
c5101a77 | 2206 | register size_t argnum = 0; |
3a7a9129 | 2207 | USE_SAFE_ALLOCA; |
db9f0278 | 2208 | |
b72e0717 | 2209 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2210 | |
2211 | GCPRO3 (args_left, fun, fun); | |
2212 | gcpro3.var = vals; | |
2213 | gcpro3.nvars = 0; | |
2214 | ||
265a9e55 | 2215 | while (!NILP (args_left)) |
db9f0278 JB |
2216 | { |
2217 | vals[argnum++] = Feval (Fcar (args_left)); | |
2218 | args_left = Fcdr (args_left); | |
2219 | gcpro3.nvars = argnum; | |
2220 | } | |
db9f0278 JB |
2221 | |
2222 | backtrace.args = vals; | |
2223 | backtrace.nargs = XINT (numargs); | |
2224 | ||
d5273788 | 2225 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2226 | UNGCPRO; |
3a7a9129 | 2227 | SAFE_FREE (); |
db9f0278 | 2228 | } |
ef1b0ba7 | 2229 | else |
db9f0278 | 2230 | { |
ef1b0ba7 SM |
2231 | GCPRO3 (args_left, fun, fun); |
2232 | gcpro3.var = argvals; | |
2233 | gcpro3.nvars = 0; | |
db9f0278 | 2234 | |
ef1b0ba7 SM |
2235 | maxargs = XSUBR (fun)->max_args; |
2236 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2237 | { | |
2238 | argvals[i] = Feval (Fcar (args_left)); | |
2239 | gcpro3.nvars = ++i; | |
2240 | } | |
db9f0278 | 2241 | |
ef1b0ba7 | 2242 | UNGCPRO; |
db9f0278 | 2243 | |
ef1b0ba7 SM |
2244 | backtrace.args = argvals; |
2245 | backtrace.nargs = XINT (numargs); | |
2246 | ||
2247 | switch (i) | |
2248 | { | |
2249 | case 0: | |
2250 | val = (XSUBR (fun)->function.a0 ()); | |
2251 | break; | |
2252 | case 1: | |
2253 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2254 | break; | |
2255 | case 2: | |
2256 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2257 | break; | |
2258 | case 3: | |
2259 | val = (XSUBR (fun)->function.a3 | |
2260 | (argvals[0], argvals[1], argvals[2])); | |
2261 | break; | |
2262 | case 4: | |
2263 | val = (XSUBR (fun)->function.a4 | |
2264 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2265 | break; | |
2266 | case 5: | |
2267 | val = (XSUBR (fun)->function.a5 | |
2268 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2269 | argvals[4])); | |
2270 | break; | |
2271 | case 6: | |
2272 | val = (XSUBR (fun)->function.a6 | |
2273 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2274 | argvals[4], argvals[5])); | |
2275 | break; | |
2276 | case 7: | |
2277 | val = (XSUBR (fun)->function.a7 | |
2278 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2279 | argvals[4], argvals[5], argvals[6])); | |
2280 | break; | |
2281 | ||
2282 | case 8: | |
2283 | val = (XSUBR (fun)->function.a8 | |
2284 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2285 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2286 | break; | |
2287 | ||
2288 | default: | |
2289 | /* Someone has created a subr that takes more arguments than | |
2290 | is supported by this code. We need to either rewrite the | |
2291 | subr to use a different argument protocol, or add more | |
2292 | cases to this switch. */ | |
2293 | abort (); | |
2294 | } | |
db9f0278 JB |
2295 | } |
2296 | } | |
ef1b0ba7 | 2297 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2298 | val = apply_lambda (fun, original_args, 1); |
2299 | else | |
2300 | { | |
8788120f | 2301 | if (EQ (fun, Qunbound)) |
734d55a2 | 2302 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2303 | if (!CONSP (fun)) |
734d55a2 KS |
2304 | xsignal1 (Qinvalid_function, original_fun); |
2305 | funcar = XCAR (fun); | |
90165123 | 2306 | if (!SYMBOLP (funcar)) |
734d55a2 | 2307 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2308 | if (EQ (funcar, Qautoload)) |
2309 | { | |
2310 | do_autoload (fun, original_fun); | |
2311 | goto retry; | |
2312 | } | |
2313 | if (EQ (funcar, Qmacro)) | |
2314 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
2315 | else if (EQ (funcar, Qlambda)) | |
2316 | val = apply_lambda (fun, original_args, 1); | |
db9f0278 | 2317 | else |
734d55a2 | 2318 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2319 | } |
c1788fbc RS |
2320 | CHECK_CONS_LIST (); |
2321 | ||
db9f0278 JB |
2322 | lisp_eval_depth--; |
2323 | if (backtrace.debug_on_exit) | |
2324 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2325 | backtrace_list = backtrace.next; | |
824eb35e | 2326 | |
db9f0278 JB |
2327 | return val; |
2328 | } | |
2329 | \f | |
2330 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
9dbc9081 PJ |
2331 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2332 | Then return the value FUNCTION returns. | |
2333 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2334 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
c5101a77 | 2335 | (size_t nargs, Lisp_Object *args) |
db9f0278 | 2336 | { |
c5101a77 | 2337 | register size_t i, numargs; |
db9f0278 JB |
2338 | register Lisp_Object spread_arg; |
2339 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2340 | Lisp_Object fun, retval; |
96d44c64 | 2341 | struct gcpro gcpro1; |
3a7a9129 | 2342 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2343 | |
2344 | fun = args [0]; | |
2345 | funcall_args = 0; | |
2346 | spread_arg = args [nargs - 1]; | |
b7826503 | 2347 | CHECK_LIST (spread_arg); |
177c0ea7 | 2348 | |
db9f0278 JB |
2349 | numargs = XINT (Flength (spread_arg)); |
2350 | ||
2351 | if (numargs == 0) | |
2352 | return Ffuncall (nargs - 1, args); | |
2353 | else if (numargs == 1) | |
2354 | { | |
03699b14 | 2355 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2356 | return Ffuncall (nargs, args); |
2357 | } | |
2358 | ||
a6e3fa71 | 2359 | numargs += nargs - 2; |
db9f0278 | 2360 | |
8788120f KS |
2361 | /* Optimize for no indirection. */ |
2362 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2363 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2364 | fun = indirect_function (fun); | |
ffd56f97 | 2365 | if (EQ (fun, Qunbound)) |
db9f0278 | 2366 | { |
ffd56f97 JB |
2367 | /* Let funcall get the error */ |
2368 | fun = args[0]; | |
2369 | goto funcall; | |
db9f0278 JB |
2370 | } |
2371 | ||
90165123 | 2372 | if (SUBRP (fun)) |
db9f0278 JB |
2373 | { |
2374 | if (numargs < XSUBR (fun)->min_args | |
2375 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2376 | goto funcall; /* Let funcall get the error */ | |
c5101a77 | 2377 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2378 | { |
2379 | /* Avoid making funcall cons up a yet another new vector of arguments | |
2380 | by explicitly supplying nil's for optional values */ | |
b72e0717 | 2381 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2382 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2383 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2384 | GCPRO1 (*funcall_args); |
2385 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2386 | } |
2387 | } | |
2388 | funcall: | |
2389 | /* We add 1 to numargs because funcall_args includes the | |
2390 | function itself as well as its arguments. */ | |
2391 | if (!funcall_args) | |
a6e3fa71 | 2392 | { |
b72e0717 | 2393 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2394 | GCPRO1 (*funcall_args); |
2395 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2396 | } |
2397 | ||
72af86bd | 2398 | memcpy (funcall_args, args, nargs * sizeof (Lisp_Object)); |
db9f0278 JB |
2399 | /* Spread the last arg we got. Its first element goes in |
2400 | the slot that it used to occupy, hence this value of I. */ | |
2401 | i = nargs - 1; | |
265a9e55 | 2402 | while (!NILP (spread_arg)) |
db9f0278 | 2403 | { |
03699b14 KR |
2404 | funcall_args [i++] = XCAR (spread_arg); |
2405 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2406 | } |
a6e3fa71 | 2407 | |
96d44c64 | 2408 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2409 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2410 | UNGCPRO; | |
2411 | SAFE_FREE (); | |
2412 | ||
2413 | return retval; | |
db9f0278 JB |
2414 | } |
2415 | \f | |
ff936e53 SM |
2416 | /* Run hook variables in various ways. */ |
2417 | ||
2418 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
c5101a77 | 2419 | static Lisp_Object run_hook_with_args (size_t, Lisp_Object *, |
bb8e180f | 2420 | enum run_hooks_condition); |
ff936e53 | 2421 | |
8b5176cd | 2422 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2423 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2424 | Each argument should be a symbol, a hook variable. |
2425 | These symbols are processed in the order specified. | |
2426 | If a hook symbol has a non-nil value, that value may be a function | |
2427 | or a list of functions to be called to run the hook. | |
2428 | If the value is a function, it is called with no arguments. | |
2429 | If it is a list, the elements are called, in order, with no arguments. | |
2430 | ||
9f685258 LK |
2431 | Major modes should not use this function directly to run their mode |
2432 | hook; they should use `run-mode-hooks' instead. | |
2433 | ||
72e85d5d RS |
2434 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2435 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2436 | usage: (run-hooks &rest HOOKS) */) |
c5101a77 | 2437 | (size_t nargs, Lisp_Object *args) |
ff936e53 SM |
2438 | { |
2439 | Lisp_Object hook[1]; | |
c5101a77 | 2440 | register size_t i; |
ff936e53 SM |
2441 | |
2442 | for (i = 0; i < nargs; i++) | |
2443 | { | |
2444 | hook[0] = args[i]; | |
2445 | run_hook_with_args (1, hook, to_completion); | |
2446 | } | |
2447 | ||
2448 | return Qnil; | |
2449 | } | |
177c0ea7 | 2450 | |
a0d76c27 | 2451 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2452 | Srun_hook_with_args, 1, MANY, 0, |
2453 | doc: /* Run HOOK with the specified arguments ARGS. | |
2454 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2455 | value, that value may be a function or a list of functions to be | |
2456 | called to run the hook. If the value is a function, it is called with | |
2457 | the given arguments and its return value is returned. If it is a list | |
2458 | of functions, those functions are called, in order, | |
2459 | with the given arguments ARGS. | |
d5e2c90c | 2460 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2461 | as that may change. |
2462 | ||
72e85d5d RS |
2463 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2464 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2465 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
c5101a77 | 2466 | (size_t nargs, Lisp_Object *args) |
ff936e53 SM |
2467 | { |
2468 | return run_hook_with_args (nargs, args, to_completion); | |
2469 | } | |
2470 | ||
a0d76c27 | 2471 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2472 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2473 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2474 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2475 | value, that value may be a function or a list of functions to be | |
2476 | called to run the hook. If the value is a function, it is called with | |
2477 | the given arguments and its return value is returned. | |
2478 | If it is a list of functions, those functions are called, in order, | |
2479 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2480 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2481 | However, if they all return nil, we return nil. |
9dbc9081 | 2482 | |
72e85d5d RS |
2483 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2484 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2485 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
c5101a77 | 2486 | (size_t nargs, Lisp_Object *args) |
b0b667cb | 2487 | { |
ff936e53 SM |
2488 | return run_hook_with_args (nargs, args, until_success); |
2489 | } | |
2490 | ||
a0d76c27 | 2491 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2492 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2493 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2494 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2495 | value, that value may be a function or a list of functions to be | |
2496 | called to run the hook. If the value is a function, it is called with | |
2497 | the given arguments and its return value is returned. | |
2498 | If it is a list of functions, those functions are called, in order, | |
2499 | with the given arguments ARGS, until one of them returns nil. | |
2500 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2501 | |
72e85d5d RS |
2502 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2503 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2504 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
c5101a77 | 2505 | (size_t nargs, Lisp_Object *args) |
ff936e53 SM |
2506 | { |
2507 | return run_hook_with_args (nargs, args, until_failure); | |
2508 | } | |
2509 | ||
c933ea05 RS |
2510 | /* ARGS[0] should be a hook symbol. |
2511 | Call each of the functions in the hook value, passing each of them | |
2512 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2513 | COND specifies a condition to test after each call | |
2514 | to decide whether to stop. | |
2515 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2516 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2517 | ||
2901f1d1 | 2518 | static Lisp_Object |
c5101a77 PE |
2519 | run_hook_with_args (size_t nargs, Lisp_Object *args, |
2520 | enum run_hooks_condition cond) | |
ff936e53 SM |
2521 | { |
2522 | Lisp_Object sym, val, ret; | |
fada05d6 | 2523 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2524 | |
f029ca5f RS |
2525 | /* If we are dying or still initializing, |
2526 | don't do anything--it would probably crash if we tried. */ | |
2527 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2528 | return Qnil; |
f029ca5f | 2529 | |
b0b667cb | 2530 | sym = args[0]; |
aa681b51 | 2531 | val = find_symbol_value (sym); |
ff936e53 SM |
2532 | ret = (cond == until_failure ? Qt : Qnil); |
2533 | ||
b0b667cb | 2534 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2535 | return ret; |
03699b14 | 2536 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2537 | { |
2538 | args[0] = val; | |
2539 | return Ffuncall (nargs, args); | |
2540 | } | |
2541 | else | |
2542 | { | |
1faed8ae PE |
2543 | Lisp_Object global_vals = Qnil; |
2544 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2545 | |
ff936e53 SM |
2546 | for (; |
2547 | CONSP (val) && ((cond == to_completion) | |
2548 | || (cond == until_success ? NILP (ret) | |
2549 | : !NILP (ret))); | |
03699b14 | 2550 | val = XCDR (val)) |
b0b667cb | 2551 | { |
03699b14 | 2552 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2553 | { |
2554 | /* t indicates this hook has a local binding; | |
2555 | it means to run the global binding too. */ | |
1faed8ae PE |
2556 | global_vals = Fdefault_value (sym); |
2557 | if (NILP (global_vals)) continue; | |
b0b667cb | 2558 | |
1faed8ae | 2559 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2560 | { |
1faed8ae | 2561 | args[0] = global_vals; |
8932b1c2 CY |
2562 | ret = Ffuncall (nargs, args); |
2563 | } | |
2564 | else | |
2565 | { | |
2566 | for (; | |
1faed8ae PE |
2567 | (CONSP (global_vals) |
2568 | && (cond == to_completion | |
2569 | || (cond == until_success | |
2570 | ? NILP (ret) | |
2571 | : !NILP (ret)))); | |
2572 | global_vals = XCDR (global_vals)) | |
8932b1c2 | 2573 | { |
1faed8ae | 2574 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2575 | /* In a global value, t should not occur. If it does, we |
2576 | must ignore it to avoid an endless loop. */ | |
2577 | if (!EQ (args[0], Qt)) | |
2578 | ret = Ffuncall (nargs, args); | |
2579 | } | |
b0b667cb KH |
2580 | } |
2581 | } | |
2582 | else | |
2583 | { | |
03699b14 | 2584 | args[0] = XCAR (val); |
ff936e53 | 2585 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2586 | } |
2587 | } | |
cb9d21f8 RS |
2588 | |
2589 | UNGCPRO; | |
ff936e53 | 2590 | return ret; |
b0b667cb KH |
2591 | } |
2592 | } | |
c933ea05 | 2593 | |
7d48558f RS |
2594 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2595 | ||
2596 | void | |
d3da34e0 | 2597 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2598 | { |
2599 | Lisp_Object temp[3]; | |
2600 | temp[0] = hook; | |
2601 | temp[1] = arg1; | |
2602 | temp[2] = arg2; | |
2603 | ||
2604 | Frun_hook_with_args (3, temp); | |
2605 | } | |
ff936e53 | 2606 | \f |
db9f0278 JB |
2607 | /* Apply fn to arg */ |
2608 | Lisp_Object | |
d3da34e0 | 2609 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2610 | { |
a6e3fa71 JB |
2611 | struct gcpro gcpro1; |
2612 | ||
2613 | GCPRO1 (fn); | |
265a9e55 | 2614 | if (NILP (arg)) |
a6e3fa71 JB |
2615 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2616 | gcpro1.nvars = 2; | |
db9f0278 JB |
2617 | { |
2618 | Lisp_Object args[2]; | |
2619 | args[0] = fn; | |
2620 | args[1] = arg; | |
a6e3fa71 JB |
2621 | gcpro1.var = args; |
2622 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2623 | } |
db9f0278 JB |
2624 | } |
2625 | ||
2626 | /* Call function fn on no arguments */ | |
2627 | Lisp_Object | |
d3da34e0 | 2628 | call0 (Lisp_Object fn) |
db9f0278 | 2629 | { |
a6e3fa71 JB |
2630 | struct gcpro gcpro1; |
2631 | ||
2632 | GCPRO1 (fn); | |
2633 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2634 | } |
2635 | ||
15285f9f | 2636 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2637 | /* ARGSUSED */ |
2638 | Lisp_Object | |
d3da34e0 | 2639 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2640 | { |
a6e3fa71 | 2641 | struct gcpro gcpro1; |
177c0ea7 | 2642 | Lisp_Object args[2]; |
a6e3fa71 | 2643 | |
db9f0278 | 2644 | args[0] = fn; |
15285f9f | 2645 | args[1] = arg1; |
a6e3fa71 JB |
2646 | GCPRO1 (args[0]); |
2647 | gcpro1.nvars = 2; | |
2648 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2649 | } |
2650 | ||
15285f9f | 2651 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2652 | /* ARGSUSED */ |
2653 | Lisp_Object | |
d3da34e0 | 2654 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2655 | { |
a6e3fa71 | 2656 | struct gcpro gcpro1; |
db9f0278 JB |
2657 | Lisp_Object args[3]; |
2658 | args[0] = fn; | |
15285f9f RS |
2659 | args[1] = arg1; |
2660 | args[2] = arg2; | |
a6e3fa71 JB |
2661 | GCPRO1 (args[0]); |
2662 | gcpro1.nvars = 3; | |
2663 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2664 | } |
2665 | ||
15285f9f | 2666 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2667 | /* ARGSUSED */ |
2668 | Lisp_Object | |
d3da34e0 | 2669 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2670 | { |
a6e3fa71 | 2671 | struct gcpro gcpro1; |
db9f0278 JB |
2672 | Lisp_Object args[4]; |
2673 | args[0] = fn; | |
15285f9f RS |
2674 | args[1] = arg1; |
2675 | args[2] = arg2; | |
2676 | args[3] = arg3; | |
a6e3fa71 JB |
2677 | GCPRO1 (args[0]); |
2678 | gcpro1.nvars = 4; | |
2679 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2680 | } |
2681 | ||
15285f9f | 2682 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2683 | /* ARGSUSED */ |
2684 | Lisp_Object | |
d3da34e0 JB |
2685 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2686 | Lisp_Object arg4) | |
a5a44b91 JB |
2687 | { |
2688 | struct gcpro gcpro1; | |
a5a44b91 JB |
2689 | Lisp_Object args[5]; |
2690 | args[0] = fn; | |
15285f9f RS |
2691 | args[1] = arg1; |
2692 | args[2] = arg2; | |
2693 | args[3] = arg3; | |
2694 | args[4] = arg4; | |
a5a44b91 JB |
2695 | GCPRO1 (args[0]); |
2696 | gcpro1.nvars = 5; | |
2697 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2698 | } |
2699 | ||
15285f9f RS |
2700 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2701 | /* ARGSUSED */ | |
2702 | Lisp_Object | |
d3da34e0 JB |
2703 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2704 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2705 | { |
2706 | struct gcpro gcpro1; | |
15285f9f RS |
2707 | Lisp_Object args[6]; |
2708 | args[0] = fn; | |
2709 | args[1] = arg1; | |
2710 | args[2] = arg2; | |
2711 | args[3] = arg3; | |
2712 | args[4] = arg4; | |
2713 | args[5] = arg5; | |
2714 | GCPRO1 (args[0]); | |
2715 | gcpro1.nvars = 6; | |
2716 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2717 | } |
2718 | ||
2719 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2720 | /* ARGSUSED */ | |
2721 | Lisp_Object | |
d3da34e0 JB |
2722 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2723 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2724 | { |
2725 | struct gcpro gcpro1; | |
15285f9f RS |
2726 | Lisp_Object args[7]; |
2727 | args[0] = fn; | |
2728 | args[1] = arg1; | |
2729 | args[2] = arg2; | |
2730 | args[3] = arg3; | |
2731 | args[4] = arg4; | |
2732 | args[5] = arg5; | |
2733 | args[6] = arg6; | |
2734 | GCPRO1 (args[0]); | |
2735 | gcpro1.nvars = 7; | |
2736 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2737 | } |
2738 | ||
574c05e2 KK |
2739 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7 */ |
2740 | /* ARGSUSED */ | |
2741 | Lisp_Object | |
d3da34e0 JB |
2742 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2743 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2744 | { |
2745 | struct gcpro gcpro1; | |
574c05e2 KK |
2746 | Lisp_Object args[8]; |
2747 | args[0] = fn; | |
2748 | args[1] = arg1; | |
2749 | args[2] = arg2; | |
2750 | args[3] = arg3; | |
2751 | args[4] = arg4; | |
2752 | args[5] = arg5; | |
2753 | args[6] = arg6; | |
2754 | args[7] = arg7; | |
2755 | GCPRO1 (args[0]); | |
2756 | gcpro1.nvars = 8; | |
2757 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2758 | } |
2759 | ||
6c2ef893 RS |
2760 | /* The caller should GCPRO all the elements of ARGS. */ |
2761 | ||
db9f0278 | 2762 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2763 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2764 | Return the value that function returns. | |
2765 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2766 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
c5101a77 | 2767 | (size_t nargs, Lisp_Object *args) |
db9f0278 | 2768 | { |
8788120f | 2769 | Lisp_Object fun, original_fun; |
db9f0278 | 2770 | Lisp_Object funcar; |
c5101a77 | 2771 | size_t numargs = nargs - 1; |
db9f0278 JB |
2772 | Lisp_Object lisp_numargs; |
2773 | Lisp_Object val; | |
2774 | struct backtrace backtrace; | |
2775 | register Lisp_Object *internal_args; | |
c5101a77 | 2776 | register size_t i; |
db9f0278 JB |
2777 | |
2778 | QUIT; | |
ee830945 RS |
2779 | if ((consing_since_gc > gc_cons_threshold |
2780 | && consing_since_gc > gc_relative_threshold) | |
2781 | || | |
2782 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 2783 | Fgarbage_collect (); |
db9f0278 JB |
2784 | |
2785 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2786 | { | |
2787 | if (max_lisp_eval_depth < 100) | |
2788 | max_lisp_eval_depth = 100; | |
2789 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2790 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2791 | } |
2792 | ||
2793 | backtrace.next = backtrace_list; | |
2794 | backtrace_list = &backtrace; | |
2795 | backtrace.function = &args[0]; | |
2796 | backtrace.args = &args[1]; | |
2797 | backtrace.nargs = nargs - 1; | |
2798 | backtrace.evalargs = 0; | |
2799 | backtrace.debug_on_exit = 0; | |
2800 | ||
2801 | if (debug_on_next_call) | |
2802 | do_debug_on_call (Qlambda); | |
2803 | ||
fff3ff9c KS |
2804 | CHECK_CONS_LIST (); |
2805 | ||
8788120f KS |
2806 | original_fun = args[0]; |
2807 | ||
db9f0278 JB |
2808 | retry: |
2809 | ||
8788120f KS |
2810 | /* Optimize for no indirection. */ |
2811 | fun = original_fun; | |
2812 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2813 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2814 | fun = indirect_function (fun); | |
db9f0278 | 2815 | |
90165123 | 2816 | if (SUBRP (fun)) |
db9f0278 | 2817 | { |
ef1b0ba7 | 2818 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
2819 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
2820 | { | |
a631e24c | 2821 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 2822 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
2823 | } |
2824 | ||
ef1b0ba7 | 2825 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 2826 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2827 | |
ef1b0ba7 SM |
2828 | else if (XSUBR (fun)->max_args == MANY) |
2829 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 2830 | else |
db9f0278 | 2831 | { |
ef1b0ba7 SM |
2832 | if (XSUBR (fun)->max_args > numargs) |
2833 | { | |
2834 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
2835 | memcpy (internal_args, args + 1, numargs * sizeof (Lisp_Object)); | |
2836 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
2837 | internal_args[i] = Qnil; | |
2838 | } | |
2839 | else | |
2840 | internal_args = args + 1; | |
2841 | switch (XSUBR (fun)->max_args) | |
2842 | { | |
2843 | case 0: | |
2844 | val = (XSUBR (fun)->function.a0 ()); | |
2845 | break; | |
2846 | case 1: | |
2847 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
2848 | break; | |
2849 | case 2: | |
2850 | val = (XSUBR (fun)->function.a2 | |
2851 | (internal_args[0], internal_args[1])); | |
2852 | break; | |
2853 | case 3: | |
2854 | val = (XSUBR (fun)->function.a3 | |
2855 | (internal_args[0], internal_args[1], internal_args[2])); | |
2856 | break; | |
2857 | case 4: | |
2858 | val = (XSUBR (fun)->function.a4 | |
2859 | (internal_args[0], internal_args[1], internal_args[2], | |
2860 | internal_args[3])); | |
2861 | break; | |
2862 | case 5: | |
2863 | val = (XSUBR (fun)->function.a5 | |
2864 | (internal_args[0], internal_args[1], internal_args[2], | |
2865 | internal_args[3], internal_args[4])); | |
2866 | break; | |
2867 | case 6: | |
2868 | val = (XSUBR (fun)->function.a6 | |
2869 | (internal_args[0], internal_args[1], internal_args[2], | |
2870 | internal_args[3], internal_args[4], internal_args[5])); | |
2871 | break; | |
2872 | case 7: | |
2873 | val = (XSUBR (fun)->function.a7 | |
2874 | (internal_args[0], internal_args[1], internal_args[2], | |
2875 | internal_args[3], internal_args[4], internal_args[5], | |
2876 | internal_args[6])); | |
2877 | break; | |
2878 | ||
2879 | case 8: | |
2880 | val = (XSUBR (fun)->function.a8 | |
2881 | (internal_args[0], internal_args[1], internal_args[2], | |
2882 | internal_args[3], internal_args[4], internal_args[5], | |
2883 | internal_args[6], internal_args[7])); | |
2884 | break; | |
2885 | ||
2886 | default: | |
2887 | ||
2888 | /* If a subr takes more than 8 arguments without using MANY | |
2889 | or UNEVALLED, we need to extend this function to support it. | |
2890 | Until this is done, there is no way to call the function. */ | |
2891 | abort (); | |
2892 | } | |
db9f0278 JB |
2893 | } |
2894 | } | |
ef1b0ba7 | 2895 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2896 | val = funcall_lambda (fun, numargs, args + 1); |
2897 | else | |
2898 | { | |
8788120f | 2899 | if (EQ (fun, Qunbound)) |
734d55a2 | 2900 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2901 | if (!CONSP (fun)) |
734d55a2 KS |
2902 | xsignal1 (Qinvalid_function, original_fun); |
2903 | funcar = XCAR (fun); | |
90165123 | 2904 | if (!SYMBOLP (funcar)) |
734d55a2 | 2905 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2906 | if (EQ (funcar, Qlambda)) |
2907 | val = funcall_lambda (fun, numargs, args + 1); | |
db9f0278 JB |
2908 | else if (EQ (funcar, Qautoload)) |
2909 | { | |
8788120f | 2910 | do_autoload (fun, original_fun); |
fff3ff9c | 2911 | CHECK_CONS_LIST (); |
db9f0278 JB |
2912 | goto retry; |
2913 | } | |
2914 | else | |
734d55a2 | 2915 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2916 | } |
c1788fbc | 2917 | CHECK_CONS_LIST (); |
db9f0278 JB |
2918 | lisp_eval_depth--; |
2919 | if (backtrace.debug_on_exit) | |
2920 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2921 | backtrace_list = backtrace.next; | |
2922 | return val; | |
2923 | } | |
2924 | \f | |
2f7c71a1 | 2925 | static Lisp_Object |
d3da34e0 | 2926 | apply_lambda (Lisp_Object fun, Lisp_Object args, int eval_flag) |
db9f0278 JB |
2927 | { |
2928 | Lisp_Object args_left; | |
c5101a77 | 2929 | size_t numargs; |
db9f0278 JB |
2930 | register Lisp_Object *arg_vector; |
2931 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c5101a77 | 2932 | register size_t i; |
db9f0278 | 2933 | register Lisp_Object tem; |
3a7a9129 | 2934 | USE_SAFE_ALLOCA; |
db9f0278 | 2935 | |
c5101a77 PE |
2936 | numargs = XINT (Flength (args)); |
2937 | SAFE_ALLOCA_LISP (arg_vector, numargs); | |
db9f0278 JB |
2938 | args_left = args; |
2939 | ||
2940 | GCPRO3 (*arg_vector, args_left, fun); | |
2941 | gcpro1.nvars = 0; | |
2942 | ||
c5101a77 | 2943 | for (i = 0; i < numargs; ) |
db9f0278 JB |
2944 | { |
2945 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
2946 | if (eval_flag) tem = Feval (tem); | |
2947 | arg_vector[i++] = tem; | |
2948 | gcpro1.nvars = i; | |
2949 | } | |
2950 | ||
2951 | UNGCPRO; | |
2952 | ||
2953 | if (eval_flag) | |
2954 | { | |
2955 | backtrace_list->args = arg_vector; | |
2956 | backtrace_list->nargs = i; | |
2957 | } | |
2958 | backtrace_list->evalargs = 0; | |
c5101a77 | 2959 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
2960 | |
2961 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2962 | if (backtrace_list->debug_on_exit) | |
2963 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
2964 | /* Don't do it again when we return to eval. */ | |
2965 | backtrace_list->debug_on_exit = 0; | |
3a7a9129 | 2966 | SAFE_FREE (); |
db9f0278 JB |
2967 | return tem; |
2968 | } | |
2969 | ||
2970 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2971 | and return the result of evaluation. | |
2972 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2973 | ||
2901f1d1 | 2974 | static Lisp_Object |
c5101a77 PE |
2975 | funcall_lambda (Lisp_Object fun, size_t nargs, |
2976 | register Lisp_Object *arg_vector) | |
db9f0278 | 2977 | { |
9ab90667 | 2978 | Lisp_Object val, syms_left, next; |
aed13378 | 2979 | int count = SPECPDL_INDEX (); |
c5101a77 PE |
2980 | size_t i; |
2981 | int optional, rest; | |
db9f0278 | 2982 | |
90165123 | 2983 | if (CONSP (fun)) |
9ab90667 GM |
2984 | { |
2985 | syms_left = XCDR (fun); | |
2986 | if (CONSP (syms_left)) | |
2987 | syms_left = XCAR (syms_left); | |
2988 | else | |
734d55a2 | 2989 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 2990 | } |
90165123 | 2991 | else if (COMPILEDP (fun)) |
845975f5 | 2992 | syms_left = AREF (fun, COMPILED_ARGLIST); |
9ab90667 GM |
2993 | else |
2994 | abort (); | |
db9f0278 | 2995 | |
9ab90667 GM |
2996 | i = optional = rest = 0; |
2997 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
2998 | { |
2999 | QUIT; | |
177c0ea7 | 3000 | |
9ab90667 | 3001 | next = XCAR (syms_left); |
8788120f | 3002 | if (!SYMBOLP (next)) |
734d55a2 | 3003 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3004 | |
db9f0278 JB |
3005 | if (EQ (next, Qand_rest)) |
3006 | rest = 1; | |
3007 | else if (EQ (next, Qand_optional)) | |
3008 | optional = 1; | |
3009 | else if (rest) | |
3010 | { | |
9ffa21d4 | 3011 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
3012 | i = nargs; |
3013 | } | |
3014 | else if (i < nargs) | |
9ab90667 | 3015 | specbind (next, arg_vector[i++]); |
db9f0278 | 3016 | else if (!optional) |
734d55a2 | 3017 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 JB |
3018 | else |
3019 | specbind (next, Qnil); | |
3020 | } | |
3021 | ||
9ab90667 | 3022 | if (!NILP (syms_left)) |
734d55a2 | 3023 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3024 | else if (i < nargs) |
734d55a2 | 3025 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3026 | |
90165123 | 3027 | if (CONSP (fun)) |
9ab90667 | 3028 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3029 | else |
ca248607 RS |
3030 | { |
3031 | /* If we have not actually read the bytecode string | |
3032 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3033 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3034 | Ffetch_bytecode (fun); |
845975f5 SM |
3035 | val = Fbyte_code (AREF (fun, COMPILED_BYTECODE), |
3036 | AREF (fun, COMPILED_CONSTANTS), | |
3037 | AREF (fun, COMPILED_STACK_DEPTH)); | |
ca248607 | 3038 | } |
177c0ea7 | 3039 | |
db9f0278 JB |
3040 | return unbind_to (count, val); |
3041 | } | |
661c7d6e KH |
3042 | |
3043 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3044 | 1, 1, 0, |
3045 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3046 | (Lisp_Object object) |
661c7d6e KH |
3047 | { |
3048 | Lisp_Object tem; | |
3049 | ||
845975f5 | 3050 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3051 | { |
845975f5 | 3052 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3053 | if (!CONSP (tem)) |
845975f5 SM |
3054 | { |
3055 | tem = AREF (object, COMPILED_BYTECODE); | |
3056 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3057 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3058 | else |
3059 | error ("Invalid byte code"); | |
3060 | } | |
3ae565b3 SM |
3061 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3062 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3063 | } |
3064 | return object; | |
3065 | } | |
db9f0278 | 3066 | \f |
475545b5 | 3067 | static void |
d3da34e0 | 3068 | grow_specpdl (void) |
db9f0278 | 3069 | { |
aed13378 | 3070 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3071 | if (specpdl_size >= max_specpdl_size) |
3072 | { | |
3073 | if (max_specpdl_size < 400) | |
3074 | max_specpdl_size = 400; | |
3075 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3076 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3077 | } |
3078 | specpdl_size *= 2; | |
3079 | if (specpdl_size > max_specpdl_size) | |
3080 | specpdl_size = max_specpdl_size; | |
3081 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3082 | specpdl_ptr = specpdl + count; | |
3083 | } | |
3084 | ||
4e2db1fe SM |
3085 | /* specpdl_ptr->symbol is a field which describes which variable is |
3086 | let-bound, so it can be properly undone when we unbind_to. | |
3087 | It can have the following two shapes: | |
3088 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3089 | a symbol that is not buffer-local (at least at the time | |
3090 | the let binding started). Note also that it should not be | |
3091 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3092 | to record V2 here). | |
3093 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3094 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3095 | which buffer is affected (or nil if the let-binding affects the | |
3096 | global value of the variable) and BUFFER tells us which buffer was | |
3097 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3098 | BUFFER did not yet have a buffer-local value). */ | |
3099 | ||
db9f0278 | 3100 | void |
d3da34e0 | 3101 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3102 | { |
ce5b453a SM |
3103 | struct Lisp_Symbol *sym; |
3104 | ||
3105 | eassert (!handling_signal); | |
db9f0278 | 3106 | |
b7826503 | 3107 | CHECK_SYMBOL (symbol); |
ce5b453a | 3108 | sym = XSYMBOL (symbol); |
db9f0278 JB |
3109 | if (specpdl_ptr == specpdl + specpdl_size) |
3110 | grow_specpdl (); | |
719177b3 | 3111 | |
ce5b453a SM |
3112 | start: |
3113 | switch (sym->redirect) | |
719177b3 | 3114 | { |
ce5b453a SM |
3115 | case SYMBOL_VARALIAS: |
3116 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3117 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3118 | /* The most common case is that of a non-constant symbol with a |
3119 | trivial value. Make that as fast as we can. */ | |
3120 | specpdl_ptr->symbol = symbol; | |
3121 | specpdl_ptr->old_value = SYMBOL_VAL (sym); | |
3122 | specpdl_ptr->func = NULL; | |
3123 | ++specpdl_ptr; | |
3124 | if (!sym->constant) | |
3125 | SET_SYMBOL_VAL (sym, value); | |
3126 | else | |
3127 | set_internal (symbol, value, Qnil, 1); | |
3128 | break; | |
4e2db1fe SM |
3129 | case SYMBOL_LOCALIZED: |
3130 | if (SYMBOL_BLV (sym)->frame_local) | |
3131 | error ("Frame-local vars cannot be let-bound"); | |
3132 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3133 | { |
3134 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3135 | specpdl_ptr->func = 0; | |
3136 | specpdl_ptr->old_value = ovalue; | |
3137 | ||
3138 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3139 | || (EQ (SYMBOL_BLV (sym)->where, | |
3140 | SYMBOL_BLV (sym)->frame_local ? | |
3141 | Fselected_frame () : Fcurrent_buffer ()))); | |
3142 | ||
3143 | if (sym->redirect == SYMBOL_LOCALIZED | |
3144 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3145 | { | |
3146 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3147 | ||
3148 | /* For a local variable, record both the symbol and which | |
3149 | buffer's or frame's value we are saving. */ | |
3150 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3151 | { | |
3152 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3153 | || (BLV_FOUND (SYMBOL_BLV (sym)) | |
3154 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); | |
3155 | where = cur_buf; | |
3156 | } | |
3157 | else if (sym->redirect == SYMBOL_LOCALIZED | |
3158 | && BLV_FOUND (SYMBOL_BLV (sym))) | |
3159 | where = SYMBOL_BLV (sym)->where; | |
3160 | else | |
3161 | where = Qnil; | |
3162 | ||
3163 | /* We're not using the `unused' slot in the specbinding | |
3164 | structure because this would mean we have to do more | |
3165 | work for simple variables. */ | |
3166 | /* FIXME: The third value `current_buffer' is only used in | |
3167 | let_shadows_buffer_binding_p which is itself only used | |
3168 | in set_internal for local_if_set. */ | |
4e2db1fe | 3169 | eassert (NILP (where) || EQ (where, cur_buf)); |
ce5b453a SM |
3170 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, cur_buf)); |
3171 | ||
3172 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3173 | buffer-local value here, make the `let' change the global | |
3174 | value by changing the value of SYMBOL in all buffers not | |
3175 | having their own value. This is consistent with what | |
3176 | happens with other buffer-local variables. */ | |
3177 | if (NILP (where) | |
3178 | && sym->redirect == SYMBOL_FORWARDED) | |
3179 | { | |
3180 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3181 | ++specpdl_ptr; | |
3182 | Fset_default (symbol, value); | |
3183 | return; | |
3184 | } | |
3185 | } | |
3186 | else | |
3187 | specpdl_ptr->symbol = symbol; | |
3188 | ||
3189 | specpdl_ptr++; | |
94b612ad | 3190 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3191 | break; |
3192 | } | |
3193 | default: abort (); | |
9ab90667 | 3194 | } |
db9f0278 JB |
3195 | } |
3196 | ||
3197 | void | |
d3da34e0 | 3198 | record_unwind_protect (Lisp_Object (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3199 | { |
9ba8e10d CY |
3200 | eassert (!handling_signal); |
3201 | ||
db9f0278 JB |
3202 | if (specpdl_ptr == specpdl + specpdl_size) |
3203 | grow_specpdl (); | |
3204 | specpdl_ptr->func = function; | |
3205 | specpdl_ptr->symbol = Qnil; | |
3206 | specpdl_ptr->old_value = arg; | |
3207 | specpdl_ptr++; | |
3208 | } | |
3209 | ||
3210 | Lisp_Object | |
d3da34e0 | 3211 | unbind_to (int count, Lisp_Object value) |
db9f0278 | 3212 | { |
5a073f50 KS |
3213 | Lisp_Object quitf = Vquit_flag; |
3214 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3215 | |
5a073f50 | 3216 | GCPRO2 (value, quitf); |
db9f0278 JB |
3217 | Vquit_flag = Qnil; |
3218 | ||
3219 | while (specpdl_ptr != specpdl + count) | |
3220 | { | |
611a8f8c RS |
3221 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3222 | the work to unbind it. We decrement first | |
3223 | so that an error in unbinding won't try to unbind | |
3224 | the same entry again, and we copy the binding first | |
3225 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3226 | |
45f266dc DL |
3227 | struct specbinding this_binding; |
3228 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3229 | |
3230 | if (this_binding.func != 0) | |
3231 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3232 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3233 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3234 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3235 | bound a variable that had a buffer-local or frame-local |
3236 | binding. WHERE nil means that the variable had the default | |
0967b4b0 | 3237 | value when it was bound. CURRENT-BUFFER is the buffer that |
bb8e180f | 3238 | was current when the variable was bound. */ |
611a8f8c | 3239 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3240 | { |
eb700b82 | 3241 | Lisp_Object symbol, where; |
719177b3 | 3242 | |
611a8f8c RS |
3243 | symbol = XCAR (this_binding.symbol); |
3244 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3245 | |
eb700b82 | 3246 | if (NILP (where)) |
611a8f8c | 3247 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3248 | /* If `where' is non-nil, reset the value in the appropriate |
3249 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3250 | else if (BUFFERP (where) |
3251 | ? !NILP (Flocal_variable_p (symbol, where)) | |
3252 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) | |
3253 | set_internal (symbol, this_binding.old_value, where, 1); | |
719177b3 | 3254 | } |
94b612ad SM |
3255 | /* If variable has a trivial value (no forwarding), we can |
3256 | just set it. No need to check for constant symbols here, | |
3257 | since that was already done by specbind. */ | |
3258 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3259 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3260 | this_binding.old_value); | |
db9f0278 | 3261 | else |
94b612ad SM |
3262 | /* NOTE: we only ever come here if make_local_foo was used for |
3263 | the first time on this var within this let. */ | |
3264 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3265 | } |
177c0ea7 | 3266 | |
5a073f50 KS |
3267 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3268 | Vquit_flag = quitf; | |
db9f0278 JB |
3269 | |
3270 | UNGCPRO; | |
db9f0278 JB |
3271 | return value; |
3272 | } | |
3273 | \f | |
db9f0278 | 3274 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3275 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3276 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3277 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 JB |
3278 | { |
3279 | register struct backtrace *backlist = backtrace_list; | |
3280 | register int i; | |
3281 | ||
b7826503 | 3282 | CHECK_NUMBER (level); |
db9f0278 JB |
3283 | |
3284 | for (i = 0; backlist && i < XINT (level); i++) | |
3285 | { | |
3286 | backlist = backlist->next; | |
3287 | } | |
3288 | ||
3289 | if (backlist) | |
265a9e55 | 3290 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3291 | |
3292 | return flag; | |
3293 | } | |
3294 | ||
3295 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3296 | doc: /* Print a trace of Lisp function calls currently active. |
3297 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3298 | (void) |
db9f0278 JB |
3299 | { |
3300 | register struct backtrace *backlist = backtrace_list; | |
3301 | register int i; | |
3302 | Lisp_Object tail; | |
3303 | Lisp_Object tem; | |
db9f0278 | 3304 | struct gcpro gcpro1; |
d4b6d95d | 3305 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3306 | |
d4b6d95d LMI |
3307 | if (NILP (Vprint_level)) |
3308 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 JB |
3309 | |
3310 | tail = Qnil; | |
3311 | GCPRO1 (tail); | |
3312 | ||
3313 | while (backlist) | |
3314 | { | |
3315 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
c5101a77 | 3316 | if (backlist->nargs == (size_t) UNEVALLED) |
db9f0278 JB |
3317 | { |
3318 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3319 | write_string ("\n", -1); |
db9f0278 JB |
3320 | } |
3321 | else | |
3322 | { | |
3323 | tem = *backlist->function; | |
3324 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
3325 | write_string ("(", -1); | |
c5101a77 | 3326 | if (backlist->nargs == (size_t) MANY) |
db9f0278 JB |
3327 | { |
3328 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 3329 | !NILP (tail); |
db9f0278 JB |
3330 | tail = Fcdr (tail), i++) |
3331 | { | |
3332 | if (i) write_string (" ", -1); | |
3333 | Fprin1 (Fcar (tail), Qnil); | |
3334 | } | |
3335 | } | |
3336 | else | |
3337 | { | |
3338 | for (i = 0; i < backlist->nargs; i++) | |
3339 | { | |
3340 | if (i) write_string (" ", -1); | |
3341 | Fprin1 (backlist->args[i], Qnil); | |
3342 | } | |
3343 | } | |
b6703b02 | 3344 | write_string (")\n", -1); |
db9f0278 | 3345 | } |
db9f0278 JB |
3346 | backlist = backlist->next; |
3347 | } | |
3348 | ||
d4b6d95d | 3349 | Vprint_level = old_print_level; |
db9f0278 JB |
3350 | UNGCPRO; |
3351 | return Qnil; | |
3352 | } | |
3353 | ||
17401c97 | 3354 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3355 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3356 | If that frame has not evaluated the arguments yet (or is a special form), | |
3357 | the value is (nil FUNCTION ARG-FORMS...). | |
3358 | If that frame has evaluated its arguments and called its function already, | |
3359 | the value is (t FUNCTION ARG-VALUES...). | |
3360 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3361 | FUNCTION is whatever was supplied as car of evaluated list, | |
3362 | or a lambda expression for macro calls. | |
3363 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3364 | (Lisp_Object nframes) |
db9f0278 JB |
3365 | { |
3366 | register struct backtrace *backlist = backtrace_list; | |
3367 | register int i; | |
3368 | Lisp_Object tem; | |
3369 | ||
b7826503 | 3370 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3371 | |
3372 | /* Find the frame requested. */ | |
b6703b02 | 3373 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3374 | backlist = backlist->next; |
3375 | ||
3376 | if (!backlist) | |
3377 | return Qnil; | |
c5101a77 | 3378 | if (backlist->nargs == (size_t) UNEVALLED) |
db9f0278 JB |
3379 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); |
3380 | else | |
3381 | { | |
c5101a77 | 3382 | if (backlist->nargs == (size_t) MANY) |
db9f0278 JB |
3383 | tem = *backlist->args; |
3384 | else | |
3385 | tem = Flist (backlist->nargs, backlist->args); | |
3386 | ||
3387 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3388 | } | |
3389 | } | |
a2ff3819 | 3390 | |
db9f0278 | 3391 | \f |
4ce0541e | 3392 | void |
d3da34e0 | 3393 | mark_backtrace (void) |
4ce0541e SM |
3394 | { |
3395 | register struct backtrace *backlist; | |
c5101a77 | 3396 | register size_t i; |
4ce0541e SM |
3397 | |
3398 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3399 | { | |
3400 | mark_object (*backlist->function); | |
3401 | ||
c5101a77 PE |
3402 | if (backlist->nargs == (size_t) UNEVALLED |
3403 | || backlist->nargs == (size_t) MANY) | |
3404 | i = 1; | |
4ce0541e | 3405 | else |
c5101a77 PE |
3406 | i = backlist->nargs; |
3407 | while (i--) | |
4ce0541e SM |
3408 | mark_object (backlist->args[i]); |
3409 | } | |
3410 | } | |
3411 | ||
dfcf069d | 3412 | void |
d3da34e0 | 3413 | syms_of_eval (void) |
db9f0278 | 3414 | { |
29208e82 | 3415 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
82fc29a1 | 3416 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3417 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3418 | an error is signaled. |
3419 | You can safely use a value considerably larger than the default value, | |
3420 | if that proves inconveniently small. However, if you increase it too far, | |
3421 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3422 | |
29208e82 | 3423 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
9dbc9081 | 3424 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3425 | |
3426 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3427 | actual stack overflow in C, which would be fatal for Emacs. |
3428 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3429 | if that proves inconveniently small. However, if you increase it too far, |
3430 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3431 | |
29208e82 | 3432 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3433 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3434 | If the value is t, that means do an ordinary quit. |
3435 | If the value equals `throw-on-input', that means quit by throwing | |
3436 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3437 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3438 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3439 | Vquit_flag = Qnil; |
3440 | ||
29208e82 | 3441 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3442 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3443 | Note that `quit-flag' will still be set by typing C-g, | |
3444 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3445 | To prevent this happening, set `quit-flag' to nil | |
3446 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3447 | Vinhibit_quit = Qnil; |
3448 | ||
d67b4f80 | 3449 | Qinhibit_quit = intern_c_string ("inhibit-quit"); |
ad236261 JB |
3450 | staticpro (&Qinhibit_quit); |
3451 | ||
d67b4f80 | 3452 | Qautoload = intern_c_string ("autoload"); |
db9f0278 JB |
3453 | staticpro (&Qautoload); |
3454 | ||
d67b4f80 | 3455 | Qdebug_on_error = intern_c_string ("debug-on-error"); |
db9f0278 JB |
3456 | staticpro (&Qdebug_on_error); |
3457 | ||
d67b4f80 | 3458 | Qmacro = intern_c_string ("macro"); |
db9f0278 JB |
3459 | staticpro (&Qmacro); |
3460 | ||
d67b4f80 | 3461 | Qdeclare = intern_c_string ("declare"); |
d6edd563 | 3462 | staticpro (&Qdeclare); |
177c0ea7 | 3463 | |
db9f0278 JB |
3464 | /* Note that the process handling also uses Qexit, but we don't want |
3465 | to staticpro it twice, so we just do it here. */ | |
d67b4f80 | 3466 | Qexit = intern_c_string ("exit"); |
db9f0278 JB |
3467 | staticpro (&Qexit); |
3468 | ||
d67b4f80 | 3469 | Qinteractive = intern_c_string ("interactive"); |
db9f0278 JB |
3470 | staticpro (&Qinteractive); |
3471 | ||
d67b4f80 | 3472 | Qcommandp = intern_c_string ("commandp"); |
db9f0278 JB |
3473 | staticpro (&Qcommandp); |
3474 | ||
d67b4f80 | 3475 | Qdefun = intern_c_string ("defun"); |
db9f0278 JB |
3476 | staticpro (&Qdefun); |
3477 | ||
d67b4f80 | 3478 | Qand_rest = intern_c_string ("&rest"); |
db9f0278 JB |
3479 | staticpro (&Qand_rest); |
3480 | ||
d67b4f80 | 3481 | Qand_optional = intern_c_string ("&optional"); |
db9f0278 JB |
3482 | staticpro (&Qand_optional); |
3483 | ||
d67b4f80 | 3484 | Qdebug = intern_c_string ("debug"); |
f01cbfdd RS |
3485 | staticpro (&Qdebug); |
3486 | ||
29208e82 | 3487 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
9dbc9081 PJ |
3488 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3489 | Does not apply to errors handled by `condition-case' or those | |
3490 | matched by `debug-ignored-errors'. | |
3491 | If the value is a list, an error only means to enter the debugger | |
3492 | if one of its condition symbols appears in the list. | |
3493 | When you evaluate an expression interactively, this variable | |
3494 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f CY |
3495 | The command `toggle-debug-on-error' toggles this. |
3496 | See also the variable `debug-on-quit'. */); | |
128c0f66 | 3497 | Vdebug_on_error = Qnil; |
db9f0278 | 3498 | |
29208e82 | 3499 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
9dbc9081 PJ |
3500 | doc: /* *List of errors for which the debugger should not be called. |
3501 | Each element may be a condition-name or a regexp that matches error messages. | |
3502 | If any element applies to a given error, that error skips the debugger | |
3503 | and just returns to top level. | |
3504 | This overrides the variable `debug-on-error'. | |
3505 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3506 | Vdebug_ignored_errors = Qnil; |
3507 | ||
29208e82 | 3508 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
82fc29a1 JB |
3509 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3510 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3511 | debug_on_quit = 0; |
3512 | ||
29208e82 | 3513 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3514 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3515 | |
29208e82 | 3516 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3517 | doc: /* Non-nil means debugger may continue execution. |
3518 | This is nil when the debugger is called under circumstances where it | |
3519 | might not be safe to continue. */); | |
dac204bc | 3520 | debugger_may_continue = 1; |
556d7314 | 3521 | |
29208e82 | 3522 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3523 | doc: /* Function to call to invoke debugger. |
3524 | If due to frame exit, args are `exit' and the value being returned; | |
3525 | this function's value will be returned instead of that. | |
3526 | If due to error, args are `error' and a list of the args to `signal'. | |
3527 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3528 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3529 | Vdebugger = Qnil; |
3530 | ||
29208e82 | 3531 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3532 | doc: /* If non-nil, this is a function for `signal' to call. |
3533 | It receives the same arguments that `signal' was given. | |
3534 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3535 | Vsignal_hook_function = Qnil; |
3536 | ||
29208e82 | 3537 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
9dbc9081 PJ |
3538 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3539 | Note that `debug-on-error', `debug-on-quit' and friends | |
3540 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3541 | Vdebug_on_signal = Qnil; |
61ede770 | 3542 | |
29208e82 | 3543 | DEFVAR_LISP ("macro-declaration-function", Vmacro_declaration_function, |
d6edd563 GM |
3544 | doc: /* Function to process declarations in a macro definition. |
3545 | The function will be called with two args MACRO and DECL. | |
3546 | MACRO is the name of the macro being defined. | |
3547 | DECL is a list `(declare ...)' containing the declarations. | |
3548 | The value the function returns is not used. */); | |
3549 | Vmacro_declaration_function = Qnil; | |
3550 | ||
d67b4f80 | 3551 | Vrun_hooks = intern_c_string ("run-hooks"); |
6e6e9f08 | 3552 | staticpro (&Vrun_hooks); |
db9f0278 JB |
3553 | |
3554 | staticpro (&Vautoload_queue); | |
3555 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3556 | staticpro (&Vsignaling_function); |
3557 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3558 | |
3559 | defsubr (&Sor); | |
3560 | defsubr (&Sand); | |
3561 | defsubr (&Sif); | |
3562 | defsubr (&Scond); | |
3563 | defsubr (&Sprogn); | |
3564 | defsubr (&Sprog1); | |
3565 | defsubr (&Sprog2); | |
3566 | defsubr (&Ssetq); | |
3567 | defsubr (&Squote); | |
3568 | defsubr (&Sfunction); | |
3569 | defsubr (&Sdefun); | |
3570 | defsubr (&Sdefmacro); | |
3571 | defsubr (&Sdefvar); | |
19cebf5a | 3572 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3573 | defsubr (&Sdefconst); |
3574 | defsubr (&Suser_variable_p); | |
3575 | defsubr (&Slet); | |
3576 | defsubr (&SletX); | |
3577 | defsubr (&Swhile); | |
3578 | defsubr (&Smacroexpand); | |
3579 | defsubr (&Scatch); | |
3580 | defsubr (&Sthrow); | |
3581 | defsubr (&Sunwind_protect); | |
3582 | defsubr (&Scondition_case); | |
3583 | defsubr (&Ssignal); | |
3584 | defsubr (&Sinteractive_p); | |
4b664e76 | 3585 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
3586 | defsubr (&Scommandp); |
3587 | defsubr (&Sautoload); | |
3588 | defsubr (&Seval); | |
3589 | defsubr (&Sapply); | |
3590 | defsubr (&Sfuncall); | |
ff936e53 SM |
3591 | defsubr (&Srun_hooks); |
3592 | defsubr (&Srun_hook_with_args); | |
3593 | defsubr (&Srun_hook_with_args_until_success); | |
3594 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 3595 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3596 | defsubr (&Sbacktrace_debug); |
3597 | defsubr (&Sbacktrace); | |
3598 | defsubr (&Sbacktrace_frame); | |
3599 | } |