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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 | ||
f6d62986 SM |
33 | /* This definition is duplicated in alloc.c and keyboard.c. */ |
34 | /* Putting it in lisp.h makes cc bomb out! */ | |
db9f0278 JB |
35 | |
36 | struct backtrace | |
4c576a83 GM |
37 | { |
38 | struct backtrace *next; | |
39 | Lisp_Object *function; | |
f6d62986 | 40 | Lisp_Object *args; /* Points to vector of args. */ |
44f230aa SM |
41 | #define NARGS_BITS (BITS_PER_INT - 2) |
42 | /* Let's not use size_t because we want to allow negative values (for | |
43 | UNEVALLED). Also let's steal 2 bits so we save a word (or more for | |
44 | alignment). In any case I doubt Emacs would survive a function call with | |
45 | more than 500M arguments. */ | |
46 | int nargs : NARGS_BITS; /* Length of vector. | |
47 | If nargs is UNEVALLED, args points | |
48 | to slot holding list of unevalled args. */ | |
49 | char evalargs : 1; | |
f6d62986 | 50 | /* Nonzero means call value of debugger when done with this operation. */ |
44f230aa | 51 | char debug_on_exit : 1; |
4c576a83 | 52 | }; |
db9f0278 JB |
53 | |
54 | struct backtrace *backtrace_list; | |
db9f0278 JB |
55 | struct catchtag *catchlist; |
56 | ||
15934ffa RS |
57 | #ifdef DEBUG_GCPRO |
58 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
59 | int gcpro_level; | |
60 | #endif | |
61 | ||
6fd797f5 | 62 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
29208e82 | 63 | Lisp_Object Qinhibit_quit; |
db9f0278 JB |
64 | Lisp_Object Qand_rest, Qand_optional; |
65 | Lisp_Object Qdebug_on_error; | |
d6edd563 | 66 | Lisp_Object Qdeclare; |
b9598260 SM |
67 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
68 | ||
f01cbfdd | 69 | Lisp_Object Qdebug; |
db9f0278 | 70 | |
6e6e9f08 RS |
71 | /* This holds either the symbol `run-hooks' or nil. |
72 | It is nil at an early stage of startup, and when Emacs | |
73 | is shutting down. */ | |
4c576a83 | 74 | |
db9f0278 JB |
75 | Lisp_Object Vrun_hooks; |
76 | ||
77 | /* Non-nil means record all fset's and provide's, to be undone | |
78 | if the file being autoloaded is not fully loaded. | |
79 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 80 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
81 | |
82 | Lisp_Object Vautoload_queue; | |
83 | ||
84 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 85 | |
5816888b | 86 | EMACS_INT specpdl_size; |
db9f0278 JB |
87 | |
88 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 89 | |
db9f0278 JB |
90 | struct specbinding *specpdl; |
91 | ||
92 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 93 | |
ab837828 | 94 | struct specbinding *specpdl_ptr; |
db9f0278 | 95 | |
db9f0278 | 96 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 97 | |
5816888b | 98 | EMACS_INT lisp_eval_depth; |
db9f0278 | 99 | |
be857679 | 100 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 101 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 102 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
103 | know that the debugger itself has an error, and we should just |
104 | signal the error instead of entering an infinite loop of debugger | |
105 | invocations. */ | |
4c576a83 | 106 | |
82da7701 | 107 | int when_entered_debugger; |
db9f0278 | 108 | |
a2ff3819 GM |
109 | /* The function from which the last `signal' was called. Set in |
110 | Fsignal. */ | |
111 | ||
112 | Lisp_Object Vsignaling_function; | |
113 | ||
4c576a83 GM |
114 | /* Set to non-zero while processing X events. Checked in Feval to |
115 | make sure the Lisp interpreter isn't called from a signal handler, | |
116 | which is unsafe because the interpreter isn't reentrant. */ | |
117 | ||
118 | int handling_signal; | |
119 | ||
40d83b41 | 120 | static Lisp_Object funcall_lambda (Lisp_Object, size_t, Lisp_Object *); |
f57e2426 | 121 | static void unwind_to_catch (struct catchtag *, Lisp_Object) NO_RETURN; |
2f7c71a1 | 122 | static int interactive_p (int); |
7200d79c | 123 | static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args); |
873759d5 | 124 | \f |
dfcf069d | 125 | void |
d3da34e0 | 126 | init_eval_once (void) |
db9f0278 JB |
127 | { |
128 | specpdl_size = 50; | |
716acfce | 129 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 130 | specpdl_ptr = specpdl; |
6588243d | 131 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
c530e1c2 | 132 | max_specpdl_size = 1300; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 133 | max_lisp_eval_depth = 600; |
34d470ba RS |
134 | |
135 | Vrun_hooks = Qnil; | |
db9f0278 JB |
136 | } |
137 | ||
dfcf069d | 138 | void |
d3da34e0 | 139 | init_eval (void) |
db9f0278 JB |
140 | { |
141 | specpdl_ptr = specpdl; | |
142 | catchlist = 0; | |
143 | handlerlist = 0; | |
144 | backtrace_list = 0; | |
145 | Vquit_flag = Qnil; | |
146 | debug_on_next_call = 0; | |
147 | lisp_eval_depth = 0; | |
87e21fbd | 148 | #ifdef DEBUG_GCPRO |
15934ffa | 149 | gcpro_level = 0; |
87e21fbd | 150 | #endif |
be857679 | 151 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 152 | when_entered_debugger = -1; |
db9f0278 JB |
153 | } |
154 | ||
f6d62986 | 155 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb RS |
156 | |
157 | static Lisp_Object | |
d3da34e0 | 158 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
159 | { |
160 | max_specpdl_size = XINT (XCAR (data)); | |
161 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 162 | return Qnil; |
9f5903bb RS |
163 | } |
164 | ||
165 | /* Call the Lisp debugger, giving it argument ARG. */ | |
166 | ||
475545b5 | 167 | static Lisp_Object |
d3da34e0 | 168 | call_debugger (Lisp_Object arg) |
db9f0278 | 169 | { |
3648c842 | 170 | int debug_while_redisplaying; |
aed13378 | 171 | int count = SPECPDL_INDEX (); |
3648c842 | 172 | Lisp_Object val; |
5816888b | 173 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 174 | |
9f5903bb RS |
175 | /* Temporarily bump up the stack limits, |
176 | so the debugger won't run out of stack. */ | |
177c0ea7 | 177 | |
9f5903bb RS |
178 | max_specpdl_size += 1; |
179 | record_unwind_protect (restore_stack_limits, | |
180 | Fcons (make_number (old_max), | |
181 | make_number (max_lisp_eval_depth))); | |
182 | max_specpdl_size = old_max; | |
183 | ||
184 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
185 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
186 | ||
187 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
188 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 189 | |
d148e14d | 190 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
191 | if (display_hourglass_p) |
192 | cancel_hourglass (); | |
237c23b0 GM |
193 | #endif |
194 | ||
db9f0278 | 195 | debug_on_next_call = 0; |
be857679 | 196 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
197 | |
198 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
199 | displayed if the debugger is invoked during redisplay. */ | |
200 | debug_while_redisplaying = redisplaying_p; | |
201 | redisplaying_p = 0; | |
556d7314 GM |
202 | specbind (intern ("debugger-may-continue"), |
203 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 204 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 205 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
206 | |
207 | #if 0 /* Binding this prevents execution of Lisp code during | |
208 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 209 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 210 | #endif |
177c0ea7 | 211 | |
3648c842 GM |
212 | val = apply1 (Vdebugger, arg); |
213 | ||
214 | /* Interrupting redisplay and resuming it later is not safe under | |
215 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 216 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
217 | if (debug_while_redisplaying) |
218 | Ftop_level (); | |
219 | ||
556d7314 | 220 | return unbind_to (count, val); |
db9f0278 JB |
221 | } |
222 | ||
475545b5 | 223 | static void |
d3da34e0 | 224 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
225 | { |
226 | debug_on_next_call = 0; | |
227 | backtrace_list->debug_on_exit = 1; | |
228 | call_debugger (Fcons (code, Qnil)); | |
229 | } | |
230 | \f | |
231 | /* NOTE!!! Every function that can call EVAL must protect its args | |
232 | and temporaries from garbage collection while it needs them. | |
233 | The definition of `For' shows what you have to do. */ | |
234 | ||
235 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
236 | doc: /* Eval args until one of them yields non-nil, then return that value. |
237 | The remaining args are not evalled at all. | |
238 | If all args return nil, return nil. | |
533eb34b | 239 | usage: (or CONDITIONS...) */) |
5842a27b | 240 | (Lisp_Object args) |
db9f0278 | 241 | { |
e509f168 | 242 | register Lisp_Object val = Qnil; |
db9f0278 JB |
243 | struct gcpro gcpro1; |
244 | ||
e509f168 | 245 | GCPRO1 (args); |
db9f0278 | 246 | |
e509f168 | 247 | while (CONSP (args)) |
db9f0278 | 248 | { |
defb1411 | 249 | val = eval_sub (XCAR (args)); |
265a9e55 | 250 | if (!NILP (val)) |
db9f0278 | 251 | break; |
e509f168 | 252 | args = XCDR (args); |
db9f0278 | 253 | } |
db9f0278 JB |
254 | |
255 | UNGCPRO; | |
256 | return val; | |
257 | } | |
258 | ||
259 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 260 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
261 | The remaining args are not evalled at all. |
262 | If no arg yields nil, return the last arg's value. | |
533eb34b | 263 | usage: (and CONDITIONS...) */) |
5842a27b | 264 | (Lisp_Object args) |
db9f0278 | 265 | { |
e509f168 | 266 | register Lisp_Object val = Qt; |
db9f0278 JB |
267 | struct gcpro gcpro1; |
268 | ||
e509f168 | 269 | GCPRO1 (args); |
db9f0278 | 270 | |
e509f168 | 271 | while (CONSP (args)) |
db9f0278 | 272 | { |
defb1411 | 273 | val = eval_sub (XCAR (args)); |
265a9e55 | 274 | if (NILP (val)) |
db9f0278 | 275 | break; |
e509f168 | 276 | args = XCDR (args); |
db9f0278 | 277 | } |
db9f0278 JB |
278 | |
279 | UNGCPRO; | |
280 | return val; | |
281 | } | |
282 | ||
283 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 284 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
285 | Returns the value of THEN or the value of the last of the ELSE's. |
286 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
287 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 288 | usage: (if COND THEN ELSE...) */) |
5842a27b | 289 | (Lisp_Object args) |
db9f0278 JB |
290 | { |
291 | register Lisp_Object cond; | |
292 | struct gcpro gcpro1; | |
293 | ||
294 | GCPRO1 (args); | |
defb1411 | 295 | cond = eval_sub (Fcar (args)); |
db9f0278 JB |
296 | UNGCPRO; |
297 | ||
265a9e55 | 298 | if (!NILP (cond)) |
defb1411 | 299 | return eval_sub (Fcar (Fcdr (args))); |
db9f0278 JB |
300 | return Fprogn (Fcdr (Fcdr (args))); |
301 | } | |
302 | ||
303 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
304 | doc: /* Try each clause until one succeeds. |
305 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
306 | and, if the value is non-nil, this clause succeeds: | |
307 | then the expressions in BODY are evaluated and the last one's | |
308 | value is the value of the cond-form. | |
309 | If no clause succeeds, cond returns nil. | |
310 | If a clause has one element, as in (CONDITION), | |
311 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 312 | usage: (cond CLAUSES...) */) |
5842a27b | 313 | (Lisp_Object args) |
db9f0278 JB |
314 | { |
315 | register Lisp_Object clause, val; | |
316 | struct gcpro gcpro1; | |
317 | ||
318 | val = Qnil; | |
319 | GCPRO1 (args); | |
265a9e55 | 320 | while (!NILP (args)) |
db9f0278 JB |
321 | { |
322 | clause = Fcar (args); | |
defb1411 | 323 | val = eval_sub (Fcar (clause)); |
265a9e55 | 324 | if (!NILP (val)) |
db9f0278 | 325 | { |
03699b14 KR |
326 | if (!EQ (XCDR (clause), Qnil)) |
327 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
328 | break; |
329 | } | |
03699b14 | 330 | args = XCDR (args); |
db9f0278 JB |
331 | } |
332 | UNGCPRO; | |
333 | ||
334 | return val; | |
335 | } | |
336 | ||
337 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
9dbc9081 | 338 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 339 | usage: (progn BODY...) */) |
5842a27b | 340 | (Lisp_Object args) |
db9f0278 | 341 | { |
e509f168 | 342 | register Lisp_Object val = Qnil; |
db9f0278 JB |
343 | struct gcpro gcpro1; |
344 | ||
e509f168 | 345 | GCPRO1 (args); |
db9f0278 | 346 | |
e509f168 | 347 | while (CONSP (args)) |
db9f0278 | 348 | { |
defb1411 | 349 | val = eval_sub (XCAR (args)); |
e509f168 | 350 | args = XCDR (args); |
db9f0278 | 351 | } |
db9f0278 JB |
352 | |
353 | UNGCPRO; | |
354 | return val; | |
355 | } | |
356 | ||
357 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 358 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
359 | The value of FIRST is saved during the evaluation of the remaining args, |
360 | whose values are discarded. | |
7a25dc6d | 361 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 362 | (Lisp_Object args) |
db9f0278 JB |
363 | { |
364 | Lisp_Object val; | |
365 | register Lisp_Object args_left; | |
366 | struct gcpro gcpro1, gcpro2; | |
367 | register int argnum = 0; | |
368 | ||
9ac66b45 | 369 | if (NILP (args)) |
db9f0278 JB |
370 | return Qnil; |
371 | ||
372 | args_left = args; | |
373 | val = Qnil; | |
374 | GCPRO2 (args, val); | |
375 | ||
376 | do | |
377 | { | |
ba83908c | 378 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 379 | if (!(argnum++)) |
ba83908c SM |
380 | val = tem; |
381 | args_left = XCDR (args_left); | |
db9f0278 | 382 | } |
ba83908c | 383 | while (CONSP (args_left)); |
db9f0278 JB |
384 | |
385 | UNGCPRO; | |
386 | return val; | |
387 | } | |
388 | ||
389 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 390 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
391 | The value of FORM2 is saved during the evaluation of the |
392 | remaining args, whose values are discarded. | |
393 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 394 | (Lisp_Object args) |
db9f0278 JB |
395 | { |
396 | Lisp_Object val; | |
397 | register Lisp_Object args_left; | |
398 | struct gcpro gcpro1, gcpro2; | |
399 | register int argnum = -1; | |
400 | ||
401 | val = Qnil; | |
402 | ||
87d238ba | 403 | if (NILP (args)) |
db9f0278 JB |
404 | return Qnil; |
405 | ||
406 | args_left = args; | |
407 | val = Qnil; | |
408 | GCPRO2 (args, val); | |
409 | ||
410 | do | |
411 | { | |
ba83908c | 412 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 413 | if (!(argnum++)) |
ba83908c SM |
414 | val = tem; |
415 | args_left = XCDR (args_left); | |
db9f0278 | 416 | } |
ba83908c | 417 | while (CONSP (args_left)); |
db9f0278 JB |
418 | |
419 | UNGCPRO; | |
420 | return val; | |
421 | } | |
422 | ||
423 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
424 | doc: /* Set each SYM to the value of its VAL. |
425 | The symbols SYM are variables; they are literal (not evaluated). | |
426 | The values VAL are expressions; they are evaluated. | |
427 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
428 | The second VAL is not computed until after the first SYM is set, and so on; | |
429 | each VAL can use the new value of variables set earlier in the `setq'. | |
430 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 431 | usage: (setq [SYM VAL]...) */) |
5842a27b | 432 | (Lisp_Object args) |
db9f0278 JB |
433 | { |
434 | register Lisp_Object args_left; | |
b9598260 | 435 | register Lisp_Object val, sym, lex_binding; |
db9f0278 JB |
436 | struct gcpro gcpro1; |
437 | ||
1283140e | 438 | if (NILP (args)) |
db9f0278 JB |
439 | return Qnil; |
440 | ||
441 | args_left = args; | |
442 | GCPRO1 (args); | |
443 | ||
444 | do | |
445 | { | |
defb1411 | 446 | val = eval_sub (Fcar (Fcdr (args_left))); |
db9f0278 | 447 | sym = Fcar (args_left); |
b9598260 | 448 | |
defb1411 | 449 | /* Like for eval_sub, we do not check declared_special here since |
f07a954e SM |
450 | it's been done when let-binding. */ |
451 | if (!NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
b9598260 | 452 | && SYMBOLP (sym) |
f07a954e SM |
453 | && !NILP (lex_binding |
454 | = Fassq (sym, Vinternal_interpreter_environment))) | |
b9598260 SM |
455 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ |
456 | else | |
457 | Fset (sym, val); /* SYM is dynamically bound. */ | |
458 | ||
db9f0278 JB |
459 | args_left = Fcdr (Fcdr (args_left)); |
460 | } | |
265a9e55 | 461 | while (!NILP(args_left)); |
db9f0278 JB |
462 | |
463 | UNGCPRO; | |
464 | return val; | |
465 | } | |
177c0ea7 | 466 | |
db9f0278 | 467 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
468 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
469 | usage: (quote ARG) */) | |
5842a27b | 470 | (Lisp_Object args) |
db9f0278 | 471 | { |
1283140e RS |
472 | if (!NILP (Fcdr (args))) |
473 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
474 | return Fcar (args); |
475 | } | |
177c0ea7 | 476 | |
db9f0278 | 477 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
478 | doc: /* Like `quote', but preferred for objects which are functions. |
479 | In byte compilation, `function' causes its argument to be compiled. | |
480 | `quote' cannot do that. | |
481 | usage: (function ARG) */) | |
5842a27b | 482 | (Lisp_Object args) |
db9f0278 | 483 | { |
b9598260 SM |
484 | Lisp_Object quoted = XCAR (args); |
485 | ||
1283140e RS |
486 | if (!NILP (Fcdr (args))) |
487 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
b9598260 SM |
488 | |
489 | if (!NILP (Vinternal_interpreter_environment) | |
490 | && CONSP (quoted) | |
491 | && EQ (XCAR (quoted), Qlambda)) | |
492 | /* This is a lambda expression within a lexical environment; | |
493 | return an interpreted closure instead of a simple lambda. */ | |
23aba0ea SM |
494 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, |
495 | XCDR (quoted))); | |
b9598260 SM |
496 | else |
497 | /* Simply quote the argument. */ | |
498 | return quoted; | |
db9f0278 JB |
499 | } |
500 | ||
e0f331ab | 501 | |
db9f0278 | 502 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
84b17ab0 | 503 | doc: /* Return t if the containing function was run directly by user input. |
82fc29a1 JB |
504 | This means that the function was called with `call-interactively' |
505 | \(which includes being called as the binding of a key) | |
84b17ab0 | 506 | and input is currently coming from the keyboard (not a keyboard macro), |
c63df42b RS |
507 | and Emacs is not running in batch mode (`noninteractive' is nil). |
508 | ||
509 | The only known proper use of `interactive-p' is in deciding whether to | |
510 | display a helpful message, or how to display it. If you're thinking | |
511 | of using it for any other purpose, it is quite likely that you're | |
512 | making a mistake. Think: what do you want to do when the command is | |
513 | called from a keyboard macro? | |
514 | ||
84b17ab0 CY |
515 | To test whether your function was called with `call-interactively', |
516 | either (i) add an extra optional argument and give it an `interactive' | |
517 | spec that specifies non-nil unconditionally (such as \"p\"); or (ii) | |
518 | use `called-interactively-p'. */) | |
5842a27b | 519 | (void) |
db9f0278 | 520 | { |
b9598260 | 521 | return interactive_p (1) ? Qt : Qnil; |
e0f331ab GM |
522 | } |
523 | ||
524 | ||
9d28c33e | 525 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 1, 0, |
84b17ab0 | 526 | doc: /* Return t if the containing function was called by `call-interactively'. |
9d28c33e SM |
527 | If KIND is `interactive', then only return t if the call was made |
528 | interactively by the user, i.e. not in `noninteractive' mode nor | |
529 | when `executing-kbd-macro'. | |
530 | If KIND is `any', on the other hand, it will return t for any kind of | |
531 | interactive call, including being called as the binding of a key, or | |
532 | from a keyboard macro, or in `noninteractive' mode. | |
533 | ||
534 | The only known proper use of `interactive' for KIND is in deciding | |
535 | whether to display a helpful message, or how to display it. If you're | |
536 | thinking of using it for any other purpose, it is quite likely that | |
537 | you're making a mistake. Think: what do you want to do when the | |
538 | command is called from a keyboard macro? | |
84b17ab0 CY |
539 | |
540 | This function is meant for implementing advice and other | |
541 | function-modifying features. Instead of using this, it is sometimes | |
542 | cleaner to give your function an extra optional argument whose | |
543 | `interactive' spec specifies non-nil unconditionally (\"p\" is a good | |
9d28c33e | 544 | way to do this), or via (not (or executing-kbd-macro noninteractive)). */) |
5842a27b | 545 | (Lisp_Object kind) |
c63df42b | 546 | { |
9d28c33e SM |
547 | return ((INTERACTIVE || !EQ (kind, intern ("interactive"))) |
548 | && interactive_p (1)) ? Qt : Qnil; | |
c63df42b RS |
549 | } |
550 | ||
551 | ||
552 | /* Return 1 if function in which this appears was called using | |
553 | call-interactively. | |
e0f331ab GM |
554 | |
555 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
556 | called is a built-in. */ | |
557 | ||
2f7c71a1 | 558 | static int |
d3da34e0 | 559 | interactive_p (int exclude_subrs_p) |
e0f331ab GM |
560 | { |
561 | struct backtrace *btp; | |
562 | Lisp_Object fun; | |
db9f0278 | 563 | |
db9f0278 | 564 | btp = backtrace_list; |
daa37602 JB |
565 | |
566 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 567 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 568 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
569 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
570 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 571 | btp = btp->next; |
daa37602 JB |
572 | |
573 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
574 | may be a frame for Fbytecode at the top level. In any version of |
575 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
576 | inside catch and condition-case. Skip past them. | |
daa37602 | 577 | |
4402a9ed | 578 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 579 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
580 | while (btp |
581 | && (EQ (*btp->function, Qbytecode) | |
44f230aa | 582 | || btp->nargs == UNEVALLED)) |
a6e3fa71 JB |
583 | btp = btp->next; |
584 | ||
f6d62986 | 585 | /* `btp' now points at the frame of the innermost function that isn't |
daa37602 JB |
586 | a special form, ignoring frames for Finteractive_p and/or |
587 | Fbytecode at the top. If this frame is for a built-in function | |
588 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 589 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
590 | if (exclude_subrs_p && SUBRP (fun)) |
591 | return 0; | |
177c0ea7 | 592 | |
f6d62986 | 593 | /* `btp' points to the frame of a Lisp function that called interactive-p. |
db9f0278 JB |
594 | Return t if that function was called interactively. */ |
595 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
596 | return 1; |
597 | return 0; | |
db9f0278 JB |
598 | } |
599 | ||
e0f331ab | 600 | |
db9f0278 | 601 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
602 | doc: /* Define NAME as a function. |
603 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
604 | See also the function `interactive'. | |
7a25dc6d | 605 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
5842a27b | 606 | (Lisp_Object args) |
db9f0278 JB |
607 | { |
608 | register Lisp_Object fn_name; | |
609 | register Lisp_Object defn; | |
610 | ||
611 | fn_name = Fcar (args); | |
6992a868 | 612 | CHECK_SYMBOL (fn_name); |
db9f0278 | 613 | defn = Fcons (Qlambda, Fcdr (args)); |
f07a954e SM |
614 | if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */ |
615 | defn = Ffunction (Fcons (defn, Qnil)); | |
265a9e55 | 616 | if (!NILP (Vpurify_flag)) |
db9f0278 | 617 | defn = Fpurecopy (defn); |
f58e9f8c RS |
618 | if (CONSP (XSYMBOL (fn_name)->function) |
619 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
620 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 621 | Ffset (fn_name, defn); |
6fd797f5 | 622 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
623 | return fn_name; |
624 | } | |
625 | ||
626 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 627 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
628 | The actual definition looks like |
629 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
630 | When the macro is called, as in (NAME ARGS...), |
631 | the function (lambda ARGLIST BODY...) is applied to | |
632 | the list ARGS... as it appears in the expression, | |
633 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
634 | |
635 | DECL is a declaration, optional, which can specify how to indent | |
4ba50634 JPW |
636 | calls to this macro, how Edebug should handle it, and which argument |
637 | should be treated as documentation. It looks like this: | |
0654d6e3 RS |
638 | (declare SPECS...) |
639 | The elements can look like this: | |
640 | (indent INDENT) | |
641 | Set NAME's `lisp-indent-function' property to INDENT. | |
642 | ||
e509f168 | 643 | (debug DEBUG) |
0654d6e3 | 644 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 645 | equivalent to writing a `def-edebug-spec' for the macro.) |
4ba50634 JPW |
646 | |
647 | (doc-string ELT) | |
648 | Set NAME's `doc-string-elt' property to ELT. | |
649 | ||
0654d6e3 | 650 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
5842a27b | 651 | (Lisp_Object args) |
db9f0278 JB |
652 | { |
653 | register Lisp_Object fn_name; | |
654 | register Lisp_Object defn; | |
d6edd563 | 655 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
656 | |
657 | fn_name = Fcar (args); | |
8e975df9 | 658 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
659 | lambda_list = Fcar (Fcdr (args)); |
660 | tail = Fcdr (Fcdr (args)); | |
661 | ||
662 | doc = Qnil; | |
663 | if (STRINGP (Fcar (tail))) | |
664 | { | |
e509f168 SM |
665 | doc = XCAR (tail); |
666 | tail = XCDR (tail); | |
d6edd563 GM |
667 | } |
668 | ||
0193499f SM |
669 | if (CONSP (Fcar (tail)) |
670 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
d6edd563 GM |
671 | { |
672 | if (!NILP (Vmacro_declaration_function)) | |
673 | { | |
674 | struct gcpro gcpro1; | |
675 | GCPRO1 (args); | |
676 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
677 | UNGCPRO; | |
678 | } | |
177c0ea7 | 679 | |
d6edd563 GM |
680 | tail = Fcdr (tail); |
681 | } | |
682 | ||
683 | if (NILP (doc)) | |
684 | tail = Fcons (lambda_list, tail); | |
685 | else | |
686 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
7200d79c | 687 | |
b9598260 | 688 | defn = Fcons (Qlambda, tail); |
f07a954e SM |
689 | if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */ |
690 | defn = Ffunction (Fcons (defn, Qnil)); | |
b9598260 | 691 | defn = Fcons (Qmacro, defn); |
177c0ea7 | 692 | |
265a9e55 | 693 | if (!NILP (Vpurify_flag)) |
db9f0278 | 694 | defn = Fpurecopy (defn); |
f58e9f8c RS |
695 | if (CONSP (XSYMBOL (fn_name)->function) |
696 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
697 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 698 | Ffset (fn_name, defn); |
6fd797f5 | 699 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
700 | return fn_name; |
701 | } | |
702 | ||
19cebf5a | 703 | |
1848d15d | 704 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 705 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 706 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 707 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
708 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
709 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
710 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
711 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 712 | The return value is BASE-VARIABLE. */) |
5842a27b | 713 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
714 | { |
715 | struct Lisp_Symbol *sym; | |
1848d15d | 716 | |
4a9308b8 JB |
717 | CHECK_SYMBOL (new_alias); |
718 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 719 | |
4a9308b8 | 720 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
721 | |
722 | if (sym->constant) | |
178f2507 SM |
723 | /* Not sure why, but why not? */ |
724 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
725 | |
726 | switch (sym->redirect) | |
727 | { | |
728 | case SYMBOL_FORWARDED: | |
729 | error ("Cannot make an internal variable an alias"); | |
730 | case SYMBOL_LOCALIZED: | |
731 | error ("Don't know how to make a localized variable an alias"); | |
732 | } | |
733 | ||
dd60787c | 734 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
735 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
736 | so that old-code that affects n_a before the aliasing is setup | |
737 | still works. */ | |
738 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 739 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
740 | |
741 | { | |
742 | struct specbinding *p; | |
743 | ||
744 | for (p = specpdl_ptr - 1; p >= specpdl; p--) | |
745 | if (p->func == NULL | |
746 | && (EQ (new_alias, | |
747 | CONSP (p->symbol) ? XCAR (p->symbol) : p->symbol))) | |
748 | error ("Don't know how to make a let-bound variable an alias"); | |
749 | } | |
750 | ||
b9598260 | 751 | sym->declared_special = 1; |
ce5b453a SM |
752 | sym->redirect = SYMBOL_VARALIAS; |
753 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
754 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
755 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
756 | /* Even if docstring is nil: remove old docstring. */ |
757 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 758 | |
4a9308b8 | 759 | return base_variable; |
19cebf5a GM |
760 | } |
761 | ||
762 | ||
db9f0278 | 763 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 764 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
765 | You are not required to define a variable in order to use it, |
766 | but the definition can supply documentation and an initial value | |
767 | in a way that tags can recognize. | |
768 | ||
769 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
770 | If SYMBOL is buffer-local, its default value is what is set; | |
771 | buffer-local values are not affected. | |
772 | INITVALUE and DOCSTRING are optional. | |
773 | If DOCSTRING starts with *, this variable is identified as a user option. | |
774 | This means that M-x set-variable recognizes it. | |
775 | See also `user-variable-p'. | |
776 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
777 | |
778 | If SYMBOL has a local binding, then this form affects the local | |
779 | binding. This is usually not what you want. Thus, if you need to | |
780 | load a file defining variables, with this form or with `defconst' or | |
781 | `defcustom', you should always load that file _outside_ any bindings | |
782 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
783 | this respect.) | |
2df5238c | 784 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 785 | (Lisp_Object args) |
db9f0278 | 786 | { |
a42ba017 | 787 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
788 | |
789 | sym = Fcar (args); | |
a42ba017 RS |
790 | tail = Fcdr (args); |
791 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 792 | error ("Too many arguments"); |
a42ba017 | 793 | |
33568849 | 794 | tem = Fdefault_boundp (sym); |
a42ba017 | 795 | if (!NILP (tail)) |
db9f0278 | 796 | { |
ba83908c SM |
797 | /* Do it before evaluating the initial value, for self-references. */ |
798 | XSYMBOL (sym)->declared_special = 1; | |
590130fb | 799 | |
1c9916a1 SM |
800 | if (SYMBOL_CONSTANT_P (sym)) |
801 | { | |
802 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
1faed8ae PE |
803 | Lisp_Object tem1 = Fcar (tail); |
804 | if (! (CONSP (tem1) | |
805 | && EQ (XCAR (tem1), Qquote) | |
806 | && CONSP (XCDR (tem1)) | |
807 | && EQ (XCAR (XCDR (tem1)), sym))) | |
1c9916a1 SM |
808 | error ("Constant symbol `%s' specified in defvar", |
809 | SDATA (SYMBOL_NAME (sym))); | |
810 | } | |
811 | ||
265a9e55 | 812 | if (NILP (tem)) |
defb1411 | 813 | Fset_default (sym, eval_sub (Fcar (tail))); |
d0bce91e SM |
814 | else |
815 | { /* Check if there is really a global binding rather than just a let | |
816 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 817 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
818 | while (--pdl >= specpdl) |
819 | { | |
820 | if (EQ (pdl->symbol, sym) && !pdl->func | |
821 | && EQ (pdl->old_value, Qunbound)) | |
822 | { | |
823 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
824 | SYMBOL_NAME (sym), 1); | |
825 | break; | |
826 | } | |
827 | } | |
828 | } | |
33568849 | 829 | tail = Fcdr (tail); |
e509f168 SM |
830 | tem = Fcar (tail); |
831 | if (!NILP (tem)) | |
33568849 | 832 | { |
33568849 SM |
833 | if (!NILP (Vpurify_flag)) |
834 | tem = Fpurecopy (tem); | |
835 | Fput (sym, Qvariable_documentation, tem); | |
836 | } | |
6fd797f5 | 837 | LOADHIST_ATTACH (sym); |
db9f0278 | 838 | } |
f07a954e SM |
839 | else if (!NILP (Vinternal_interpreter_environment) |
840 | && !XSYMBOL (sym)->declared_special) | |
841 | /* A simple (defvar foo) with lexical scoping does "nothing" except | |
842 | declare that var to be dynamically scoped *locally* (i.e. within | |
843 | the current file or let-block). */ | |
844 | Vinternal_interpreter_environment = | |
845 | Fcons (sym, Vinternal_interpreter_environment); | |
33568849 | 846 | else |
d28a2170 PE |
847 | { |
848 | /* Simple (defvar <var>) should not count as a definition at all. | |
849 | It could get in the way of other definitions, and unloading this | |
850 | package could try to make the variable unbound. */ | |
851 | } | |
addf35fd | 852 | |
db9f0278 JB |
853 | return sym; |
854 | } | |
855 | ||
856 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
857 | doc: /* Define SYMBOL as a constant variable. |
858 | The intent is that neither programs nor users should ever change this value. | |
859 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
860 | If SYMBOL is buffer-local, its default value is what is set; | |
861 | buffer-local values are not affected. | |
862 | DOCSTRING is optional. | |
733f68b6 LT |
863 | |
864 | If SYMBOL has a local binding, then this form sets the local binding's | |
865 | value. However, you should normally not make local bindings for | |
866 | variables defined with this form. | |
7a25dc6d | 867 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 868 | (Lisp_Object args) |
db9f0278 JB |
869 | { |
870 | register Lisp_Object sym, tem; | |
871 | ||
872 | sym = Fcar (args); | |
a42ba017 | 873 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 874 | error ("Too many arguments"); |
a42ba017 | 875 | |
defb1411 | 876 | tem = eval_sub (Fcar (Fcdr (args))); |
1182a7cb DL |
877 | if (!NILP (Vpurify_flag)) |
878 | tem = Fpurecopy (tem); | |
879 | Fset_default (sym, tem); | |
b9598260 | 880 | XSYMBOL (sym)->declared_special = 1; |
db9f0278 | 881 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 882 | if (!NILP (tem)) |
db9f0278 | 883 | { |
265a9e55 | 884 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
885 | tem = Fpurecopy (tem); |
886 | Fput (sym, Qvariable_documentation, tem); | |
887 | } | |
873759d5 | 888 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 889 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
890 | return sym; |
891 | } | |
892 | ||
606cdb89 JB |
893 | /* Error handler used in Fuser_variable_p. */ |
894 | static Lisp_Object | |
d3da34e0 | 895 | user_variable_p_eh (Lisp_Object ignore) |
606cdb89 JB |
896 | { |
897 | return Qnil; | |
898 | } | |
899 | ||
40a69fac SM |
900 | static Lisp_Object |
901 | lisp_indirect_variable (Lisp_Object sym) | |
902 | { | |
cfcbfb1a PE |
903 | struct Lisp_Symbol *s = indirect_variable (XSYMBOL (sym)); |
904 | XSETSYMBOL (sym, s); | |
40a69fac SM |
905 | return sym; |
906 | } | |
907 | ||
db9f0278 | 908 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 909 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 910 | \(The alternative is a variable used internally in a Lisp program.) |
606cdb89 JB |
911 | A variable is a user variable if |
912 | \(1) the first character of its documentation is `*', or | |
913 | \(2) it is customizable (its property list contains a non-nil value | |
914 | of `standard-value' or `custom-autoload'), or | |
915 | \(3) it is an alias for another user variable. | |
916 | Return nil if VARIABLE is an alias and there is a loop in the | |
917 | chain of symbols. */) | |
5842a27b | 918 | (Lisp_Object variable) |
db9f0278 JB |
919 | { |
920 | Lisp_Object documentation; | |
177c0ea7 | 921 | |
5e78e475 RS |
922 | if (!SYMBOLP (variable)) |
923 | return Qnil; | |
924 | ||
606cdb89 | 925 | /* If indirect and there's an alias loop, don't check anything else. */ |
ce5b453a | 926 | if (XSYMBOL (variable)->redirect == SYMBOL_VARALIAS |
40a69fac | 927 | && NILP (internal_condition_case_1 (lisp_indirect_variable, variable, |
bb8e180f | 928 | Qt, user_variable_p_eh))) |
606cdb89 JB |
929 | return Qnil; |
930 | ||
931 | while (1) | |
932 | { | |
933 | documentation = Fget (variable, Qvariable_documentation); | |
934 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
bb8e180f | 935 | return Qt; |
606cdb89 | 936 | if (STRINGP (documentation) |
bb8e180f AS |
937 | && ((unsigned char) SREF (documentation, 0) == '*')) |
938 | return Qt; | |
606cdb89 JB |
939 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ |
940 | if (CONSP (documentation) | |
bb8e180f AS |
941 | && STRINGP (XCAR (documentation)) |
942 | && INTEGERP (XCDR (documentation)) | |
943 | && XINT (XCDR (documentation)) < 0) | |
944 | return Qt; | |
606cdb89 JB |
945 | /* Customizable? See `custom-variable-p'. */ |
946 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
bb8e180f AS |
947 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) |
948 | return Qt; | |
606cdb89 | 949 | |
ce5b453a | 950 | if (!(XSYMBOL (variable)->redirect == SYMBOL_VARALIAS)) |
bb8e180f | 951 | return Qnil; |
606cdb89 JB |
952 | |
953 | /* An indirect variable? Let's follow the chain. */ | |
ce5b453a | 954 | XSETSYMBOL (variable, SYMBOL_ALIAS (XSYMBOL (variable))); |
606cdb89 | 955 | } |
177c0ea7 | 956 | } |
db9f0278 JB |
957 | \f |
958 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
959 | doc: /* Bind variables according to VARLIST then eval BODY. |
960 | The value of the last form in BODY is returned. | |
961 | Each element of VARLIST is a symbol (which is bound to nil) | |
962 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
963 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 964 | usage: (let* VARLIST BODY...) */) |
5842a27b | 965 | (Lisp_Object args) |
db9f0278 | 966 | { |
b9598260 | 967 | Lisp_Object varlist, var, val, elt, lexenv; |
aed13378 | 968 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
969 | struct gcpro gcpro1, gcpro2, gcpro3; |
970 | ||
971 | GCPRO3 (args, elt, varlist); | |
972 | ||
b9598260 SM |
973 | lexenv = Vinternal_interpreter_environment; |
974 | ||
db9f0278 | 975 | varlist = Fcar (args); |
b9598260 | 976 | while (CONSP (varlist)) |
db9f0278 JB |
977 | { |
978 | QUIT; | |
b9598260 SM |
979 | |
980 | elt = XCAR (varlist); | |
90165123 | 981 | if (SYMBOLP (elt)) |
b9598260 SM |
982 | { |
983 | var = elt; | |
984 | val = Qnil; | |
985 | } | |
08564963 | 986 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 987 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
988 | else |
989 | { | |
b9598260 | 990 | var = Fcar (elt); |
defb1411 | 991 | val = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 | 992 | } |
b9598260 | 993 | |
f07a954e SM |
994 | if (!NILP (lexenv) && SYMBOLP (var) |
995 | && !XSYMBOL (var)->declared_special | |
996 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
997 | /* Lexically bind VAR by adding it to the interpreter's binding |
998 | alist. */ | |
999 | { | |
f07a954e SM |
1000 | Lisp_Object newenv |
1001 | = Fcons (Fcons (var, val), Vinternal_interpreter_environment); | |
1002 | if (EQ (Vinternal_interpreter_environment, lexenv)) | |
1003 | /* Save the old lexical environment on the specpdl stack, | |
1004 | but only for the first lexical binding, since we'll never | |
1005 | need to revert to one of the intermediate ones. */ | |
1006 | specbind (Qinternal_interpreter_environment, newenv); | |
1007 | else | |
1008 | Vinternal_interpreter_environment = newenv; | |
db9f0278 | 1009 | } |
b9598260 SM |
1010 | else |
1011 | specbind (var, val); | |
1012 | ||
1013 | varlist = XCDR (varlist); | |
db9f0278 JB |
1014 | } |
1015 | UNGCPRO; | |
1016 | val = Fprogn (Fcdr (args)); | |
1017 | return unbind_to (count, val); | |
1018 | } | |
1019 | ||
1020 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1021 | doc: /* Bind variables according to VARLIST then eval BODY. |
1022 | The value of the last form in BODY is returned. | |
1023 | Each element of VARLIST is a symbol (which is bound to nil) | |
1024 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1025 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 1026 | usage: (let VARLIST BODY...) */) |
5842a27b | 1027 | (Lisp_Object args) |
db9f0278 | 1028 | { |
b9598260 | 1029 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 1030 | register Lisp_Object elt, varlist; |
aed13378 | 1031 | int count = SPECPDL_INDEX (); |
c5101a77 | 1032 | register size_t argnum; |
db9f0278 | 1033 | struct gcpro gcpro1, gcpro2; |
3a7a9129 | 1034 | USE_SAFE_ALLOCA; |
db9f0278 JB |
1035 | |
1036 | varlist = Fcar (args); | |
1037 | ||
f6d62986 | 1038 | /* Make space to hold the values to give the bound variables. */ |
db9f0278 | 1039 | elt = Flength (varlist); |
b72e0717 | 1040 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 | 1041 | |
f6d62986 | 1042 | /* Compute the values and store them in `temps'. */ |
db9f0278 JB |
1043 | |
1044 | GCPRO2 (args, *temps); | |
1045 | gcpro2.nvars = 0; | |
1046 | ||
67ee9f6e | 1047 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
1048 | { |
1049 | QUIT; | |
67ee9f6e | 1050 | elt = XCAR (varlist); |
90165123 | 1051 | if (SYMBOLP (elt)) |
db9f0278 | 1052 | temps [argnum++] = Qnil; |
08564963 | 1053 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1054 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 | 1055 | else |
defb1411 | 1056 | temps [argnum++] = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 JB |
1057 | gcpro2.nvars = argnum; |
1058 | } | |
1059 | UNGCPRO; | |
1060 | ||
b9598260 SM |
1061 | lexenv = Vinternal_interpreter_environment; |
1062 | ||
db9f0278 | 1063 | varlist = Fcar (args); |
67ee9f6e | 1064 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 1065 | { |
b9598260 SM |
1066 | Lisp_Object var; |
1067 | ||
67ee9f6e | 1068 | elt = XCAR (varlist); |
b9598260 | 1069 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 1070 | tem = temps[argnum++]; |
b9598260 | 1071 | |
f07a954e SM |
1072 | if (!NILP (lexenv) && SYMBOLP (var) |
1073 | && !XSYMBOL (var)->declared_special | |
1074 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
1075 | /* Lexically bind VAR by adding it to the lexenv alist. */ |
1076 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 1077 | else |
b9598260 SM |
1078 | /* Dynamically bind VAR. */ |
1079 | specbind (var, tem); | |
db9f0278 JB |
1080 | } |
1081 | ||
b9598260 SM |
1082 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
1083 | /* Instantiate a new lexical environment. */ | |
1084 | specbind (Qinternal_interpreter_environment, lexenv); | |
1085 | ||
db9f0278 | 1086 | elt = Fprogn (Fcdr (args)); |
3a7a9129 | 1087 | SAFE_FREE (); |
db9f0278 JB |
1088 | return unbind_to (count, elt); |
1089 | } | |
1090 | ||
1091 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1092 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1093 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1094 | until TEST returns nil. | |
7a25dc6d | 1095 | usage: (while TEST BODY...) */) |
5842a27b | 1096 | (Lisp_Object args) |
db9f0278 | 1097 | { |
2b9bde76 | 1098 | Lisp_Object test, body; |
db9f0278 JB |
1099 | struct gcpro gcpro1, gcpro2; |
1100 | ||
1101 | GCPRO2 (test, body); | |
1102 | ||
1103 | test = Fcar (args); | |
1104 | body = Fcdr (args); | |
defb1411 | 1105 | while (!NILP (eval_sub (test))) |
db9f0278 JB |
1106 | { |
1107 | QUIT; | |
1108 | Fprogn (body); | |
1109 | } | |
1110 | ||
1111 | UNGCPRO; | |
1112 | return Qnil; | |
1113 | } | |
1114 | ||
1115 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1116 | doc: /* Return result of expanding macros at top level of FORM. |
1117 | If FORM is not a macro call, it is returned unchanged. | |
1118 | Otherwise, the macro is expanded and the expansion is considered | |
1119 | in place of FORM. When a non-macro-call results, it is returned. | |
1120 | ||
1121 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1122 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 1123 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 1124 | { |
23d6b5a6 | 1125 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1126 | register Lisp_Object expander, sym, def, tem; |
1127 | ||
1128 | while (1) | |
1129 | { | |
1130 | /* Come back here each time we expand a macro call, | |
1131 | in case it expands into another macro call. */ | |
90165123 | 1132 | if (!CONSP (form)) |
db9f0278 | 1133 | break; |
23d6b5a6 | 1134 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1135 | def = sym = XCAR (form); |
23d6b5a6 | 1136 | tem = Qnil; |
db9f0278 JB |
1137 | /* Trace symbols aliases to other symbols |
1138 | until we get a symbol that is not an alias. */ | |
90165123 | 1139 | while (SYMBOLP (def)) |
db9f0278 JB |
1140 | { |
1141 | QUIT; | |
23d6b5a6 | 1142 | sym = def; |
79e8bfbf | 1143 | tem = Fassq (sym, environment); |
265a9e55 | 1144 | if (NILP (tem)) |
db9f0278 JB |
1145 | { |
1146 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1147 | if (!EQ (def, Qunbound)) |
1148 | continue; | |
db9f0278 | 1149 | } |
23d6b5a6 | 1150 | break; |
db9f0278 | 1151 | } |
79e8bfbf | 1152 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1153 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1154 | if (NILP (tem)) |
db9f0278 | 1155 | { |
79e8bfbf | 1156 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1157 | Look at its function definition. */ |
90165123 | 1158 | if (EQ (def, Qunbound) || !CONSP (def)) |
f6d62986 | 1159 | /* Not defined or definition not suitable. */ |
db9f0278 | 1160 | break; |
03699b14 | 1161 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1162 | { |
1163 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1164 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1165 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1166 | /* Yes, load it and try again. */ |
1167 | { | |
ca20916b RS |
1168 | struct gcpro gcpro1; |
1169 | GCPRO1 (form); | |
ee9ee63c | 1170 | do_autoload (def, sym); |
ca20916b | 1171 | UNGCPRO; |
ee9ee63c JB |
1172 | continue; |
1173 | } | |
1174 | else | |
db9f0278 | 1175 | break; |
db9f0278 | 1176 | } |
03699b14 | 1177 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1178 | break; |
03699b14 | 1179 | else expander = XCDR (def); |
db9f0278 JB |
1180 | } |
1181 | else | |
1182 | { | |
03699b14 | 1183 | expander = XCDR (tem); |
265a9e55 | 1184 | if (NILP (expander)) |
db9f0278 JB |
1185 | break; |
1186 | } | |
03699b14 | 1187 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1188 | } |
1189 | return form; | |
1190 | } | |
1191 | \f | |
1192 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1193 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1194 | TAG is evalled to get the tag to use; it must not be nil. | |
1195 | ||
1196 | Then the BODY is executed. | |
1d632ccf | 1197 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1198 | If no throw happens, `catch' returns the value of the last BODY form. |
1199 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1200 | usage: (catch TAG BODY...) */) |
5842a27b | 1201 | (Lisp_Object args) |
db9f0278 JB |
1202 | { |
1203 | register Lisp_Object tag; | |
1204 | struct gcpro gcpro1; | |
1205 | ||
1206 | GCPRO1 (args); | |
defb1411 | 1207 | tag = eval_sub (Fcar (args)); |
db9f0278 JB |
1208 | UNGCPRO; |
1209 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1210 | } | |
1211 | ||
1212 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1213 | FUNC should return a Lisp_Object. | |
1214 | This is how catches are done from within C code. */ | |
1215 | ||
1216 | Lisp_Object | |
d3da34e0 | 1217 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1218 | { |
1219 | /* This structure is made part of the chain `catchlist'. */ | |
1220 | struct catchtag c; | |
1221 | ||
1222 | /* Fill in the components of c, and put it on the list. */ | |
1223 | c.next = catchlist; | |
1224 | c.tag = tag; | |
1225 | c.val = Qnil; | |
1226 | c.backlist = backtrace_list; | |
1227 | c.handlerlist = handlerlist; | |
1228 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1229 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1230 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1231 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1232 | c.gcpro = gcprolist; |
bcf28080 | 1233 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1234 | catchlist = &c; |
1235 | ||
1236 | /* Call FUNC. */ | |
1237 | if (! _setjmp (c.jmp)) | |
1238 | c.val = (*func) (arg); | |
1239 | ||
1240 | /* Throw works by a longjmp that comes right here. */ | |
1241 | catchlist = c.next; | |
1242 | return c.val; | |
1243 | } | |
1244 | ||
ba410f40 JB |
1245 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1246 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1247 | |
ba410f40 JB |
1248 | This is the guts Fthrow and Fsignal; they differ only in the way |
1249 | they choose the catch tag to throw to. A catch tag for a | |
1250 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1251 | |
ba410f40 JB |
1252 | Before each catch is discarded, unbind all special bindings and |
1253 | execute all unwind-protect clauses made above that catch. Unwind | |
1254 | the handler stack as we go, so that the proper handlers are in | |
1255 | effect for each unwind-protect clause we run. At the end, restore | |
1256 | some static info saved in CATCH, and longjmp to the location | |
1257 | specified in the | |
1258 | ||
1259 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1260 | |
1261 | static void | |
d3da34e0 | 1262 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 JB |
1263 | { |
1264 | register int last_time; | |
1265 | ||
ba410f40 JB |
1266 | /* Save the value in the tag. */ |
1267 | catch->val = value; | |
1268 | ||
0b31741c | 1269 | /* Restore certain special C variables. */ |
1cdc3155 | 1270 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1271 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1272 | handling_signal = 0; |
69bbd6bd | 1273 | immediate_quit = 0; |
82da7701 | 1274 | |
db9f0278 JB |
1275 | do |
1276 | { | |
1277 | last_time = catchlist == catch; | |
82da7701 JB |
1278 | |
1279 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1280 | handlers. */ |
db9f0278 JB |
1281 | unbind_to (catchlist->pdlcount, Qnil); |
1282 | handlerlist = catchlist->handlerlist; | |
1283 | catchlist = catchlist->next; | |
1284 | } | |
1285 | while (! last_time); | |
1286 | ||
a2a103bb | 1287 | #if HAVE_X_WINDOWS |
88019a63 RS |
1288 | /* If x_catch_errors was done, turn it off now. |
1289 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 | 1290 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
bb8e180f AS |
1291 | The catch must remain in effect during that delicate |
1292 | state. --lorentey */ | |
88019a63 | 1293 | x_fully_uncatch_errors (); |
e6aee454 | 1294 | #endif |
a2a103bb | 1295 | #endif |
88019a63 | 1296 | |
bcf28080 | 1297 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1298 | gcprolist = catch->gcpro; |
15934ffa | 1299 | #ifdef DEBUG_GCPRO |
d8e2b5ba | 1300 | gcpro_level = gcprolist ? gcprolist->level + 1 : 0; |
15934ffa | 1301 | #endif |
db9f0278 JB |
1302 | backtrace_list = catch->backlist; |
1303 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1304 | |
ba410f40 | 1305 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1306 | } |
1307 | ||
1308 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
9dbc9081 PJ |
1309 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1310 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1311 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1312 | { |
1313 | register struct catchtag *c; | |
1314 | ||
8788120f KS |
1315 | if (!NILP (tag)) |
1316 | for (c = catchlist; c; c = c->next) | |
1317 | { | |
1318 | if (EQ (c->tag, tag)) | |
1319 | unwind_to_catch (c, value); | |
1320 | } | |
734d55a2 | 1321 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1322 | } |
1323 | ||
1324 | ||
1325 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1326 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1327 | If BODYFORM completes normally, its value is returned | |
1328 | after executing the UNWINDFORMS. | |
1329 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1330 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1331 | (Lisp_Object args) |
db9f0278 JB |
1332 | { |
1333 | Lisp_Object val; | |
aed13378 | 1334 | int count = SPECPDL_INDEX (); |
db9f0278 | 1335 | |
04b28167 | 1336 | record_unwind_protect (Fprogn, Fcdr (args)); |
defb1411 | 1337 | val = eval_sub (Fcar (args)); |
177c0ea7 | 1338 | return unbind_to (count, val); |
db9f0278 JB |
1339 | } |
1340 | \f | |
1341 | /* Chain of condition handlers currently in effect. | |
1342 | The elements of this chain are contained in the stack frames | |
1343 | of Fcondition_case and internal_condition_case. | |
1344 | When an error is signaled (by calling Fsignal, below), | |
1345 | this chain is searched for an element that applies. */ | |
1346 | ||
1347 | struct handler *handlerlist; | |
1348 | ||
1349 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
9dbc9081 | 1350 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1351 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1352 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1353 | where the BODY is made of Lisp expressions. | |
1354 | ||
1355 | A handler is applicable to an error | |
1356 | if CONDITION-NAME is one of the error's condition names. | |
1357 | If an error happens, the first applicable handler is run. | |
1358 | ||
1359 | The car of a handler may be a list of condition names | |
c997bb25 | 1360 | instead of a single condition name. Then it handles all of them. |
9dbc9081 | 1361 | |
c997bb25 RS |
1362 | When a handler handles an error, control returns to the `condition-case' |
1363 | and it executes the handler's BODY... | |
d0acbbaf | 1364 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1365 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1366 | Then the value of the last BODY form is returned from the `condition-case' |
1367 | expression. | |
9dbc9081 | 1368 | |
9dbc9081 | 1369 | See also the function `signal' for more info. |
2b47b74d | 1370 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1371 | (Lisp_Object args) |
db9f0278 | 1372 | { |
17401c97 GM |
1373 | register Lisp_Object bodyform, handlers; |
1374 | volatile Lisp_Object var; | |
db9f0278 | 1375 | |
82da7701 JB |
1376 | var = Fcar (args); |
1377 | bodyform = Fcar (Fcdr (args)); | |
1378 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1379 | |
1380 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1381 | } | |
1382 | ||
1383 | /* Like Fcondition_case, but the args are separate | |
1384 | rather than passed in a list. Used by Fbyte_code. */ | |
1385 | ||
1386 | Lisp_Object | |
d3da34e0 JB |
1387 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1388 | Lisp_Object handlers) | |
ee830945 RS |
1389 | { |
1390 | Lisp_Object val; | |
1391 | struct catchtag c; | |
1392 | struct handler h; | |
1393 | ||
b7826503 | 1394 | CHECK_SYMBOL (var); |
82da7701 | 1395 | |
2b47b74d | 1396 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1397 | { |
1398 | Lisp_Object tem; | |
2b47b74d | 1399 | tem = XCAR (val); |
5f96776a RS |
1400 | if (! (NILP (tem) |
1401 | || (CONSP (tem) | |
03699b14 KR |
1402 | && (SYMBOLP (XCAR (tem)) |
1403 | || CONSP (XCAR (tem)))))) | |
82da7701 JB |
1404 | error ("Invalid condition handler", tem); |
1405 | } | |
db9f0278 JB |
1406 | |
1407 | c.tag = Qnil; | |
1408 | c.val = Qnil; | |
1409 | c.backlist = backtrace_list; | |
1410 | c.handlerlist = handlerlist; | |
1411 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1412 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1413 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1414 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1415 | c.gcpro = gcprolist; |
bcf28080 | 1416 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1417 | if (_setjmp (c.jmp)) |
1418 | { | |
265a9e55 | 1419 | if (!NILP (h.var)) |
bb8e180f | 1420 | specbind (h.var, c.val); |
9d58218c | 1421 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1422 | |
1423 | /* Note that this just undoes the binding of h.var; whoever | |
1424 | longjumped to us unwound the stack to c.pdlcount before | |
1425 | throwing. */ | |
db9f0278 JB |
1426 | unbind_to (c.pdlcount, Qnil); |
1427 | return val; | |
1428 | } | |
1429 | c.next = catchlist; | |
1430 | catchlist = &c; | |
177c0ea7 | 1431 | |
82da7701 JB |
1432 | h.var = var; |
1433 | h.handler = handlers; | |
db9f0278 | 1434 | h.next = handlerlist; |
db9f0278 JB |
1435 | h.tag = &c; |
1436 | handlerlist = &h; | |
1437 | ||
defb1411 | 1438 | val = eval_sub (bodyform); |
db9f0278 JB |
1439 | catchlist = c.next; |
1440 | handlerlist = h.next; | |
1441 | return val; | |
1442 | } | |
1443 | ||
f029ca5f RS |
1444 | /* Call the function BFUN with no arguments, catching errors within it |
1445 | according to HANDLERS. If there is an error, call HFUN with | |
1446 | one argument which is the data that describes the error: | |
1447 | (SIGNALNAME . DATA) | |
1448 | ||
1449 | HANDLERS can be a list of conditions to catch. | |
1450 | If HANDLERS is Qt, catch all errors. | |
1451 | If HANDLERS is Qerror, catch all errors | |
1452 | but allow the debugger to run if that is enabled. */ | |
1453 | ||
db9f0278 | 1454 | Lisp_Object |
d3da34e0 JB |
1455 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1456 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1457 | { |
1458 | Lisp_Object val; | |
1459 | struct catchtag c; | |
1460 | struct handler h; | |
1461 | ||
88019a63 RS |
1462 | /* Since Fsignal will close off all calls to x_catch_errors, |
1463 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1464 | #if HAVE_X_WINDOWS |
88019a63 | 1465 | if (x_catching_errors ()) |
01591d17 | 1466 | abort (); |
a2a103bb | 1467 | #endif |
01591d17 | 1468 | |
db9f0278 JB |
1469 | c.tag = Qnil; |
1470 | c.val = Qnil; | |
1471 | c.backlist = backtrace_list; | |
1472 | c.handlerlist = handlerlist; | |
1473 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1474 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1475 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1476 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1477 | c.gcpro = gcprolist; |
bcf28080 | 1478 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1479 | if (_setjmp (c.jmp)) |
1480 | { | |
9d58218c | 1481 | return (*hfun) (c.val); |
db9f0278 JB |
1482 | } |
1483 | c.next = catchlist; | |
1484 | catchlist = &c; | |
1485 | h.handler = handlers; | |
1486 | h.var = Qnil; | |
db9f0278 JB |
1487 | h.next = handlerlist; |
1488 | h.tag = &c; | |
1489 | handlerlist = &h; | |
1490 | ||
1491 | val = (*bfun) (); | |
1492 | catchlist = c.next; | |
1493 | handlerlist = h.next; | |
1494 | return val; | |
1495 | } | |
1496 | ||
2659a09f | 1497 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1498 | |
d227775c | 1499 | Lisp_Object |
d3da34e0 JB |
1500 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1501 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1502 | { |
1503 | Lisp_Object val; | |
1504 | struct catchtag c; | |
1505 | struct handler h; | |
1506 | ||
88019a63 RS |
1507 | /* Since Fsignal will close off all calls to x_catch_errors, |
1508 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1509 | #if HAVE_X_WINDOWS |
88019a63 RS |
1510 | if (x_catching_errors ()) |
1511 | abort (); | |
a2a103bb | 1512 | #endif |
88019a63 | 1513 | |
d227775c RS |
1514 | c.tag = Qnil; |
1515 | c.val = Qnil; | |
1516 | c.backlist = backtrace_list; | |
1517 | c.handlerlist = handlerlist; | |
1518 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1519 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1520 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1521 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1522 | c.gcpro = gcprolist; |
bcf28080 | 1523 | c.byte_stack = byte_stack_list; |
d227775c RS |
1524 | if (_setjmp (c.jmp)) |
1525 | { | |
9d58218c | 1526 | return (*hfun) (c.val); |
d227775c RS |
1527 | } |
1528 | c.next = catchlist; | |
1529 | catchlist = &c; | |
1530 | h.handler = handlers; | |
1531 | h.var = Qnil; | |
1532 | h.next = handlerlist; | |
1533 | h.tag = &c; | |
1534 | handlerlist = &h; | |
1535 | ||
1536 | val = (*bfun) (arg); | |
1537 | catchlist = c.next; | |
1538 | handlerlist = h.next; | |
1539 | return val; | |
1540 | } | |
10b29d41 | 1541 | |
53967e09 CY |
1542 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1543 | its arguments. */ | |
1544 | ||
1545 | Lisp_Object | |
178f2507 SM |
1546 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1547 | Lisp_Object arg1, | |
1548 | Lisp_Object arg2, | |
1549 | Lisp_Object handlers, | |
1550 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1551 | { |
1552 | Lisp_Object val; | |
1553 | struct catchtag c; | |
1554 | struct handler h; | |
1555 | ||
1556 | /* Since Fsignal will close off all calls to x_catch_errors, | |
1557 | we will get the wrong results if some are not closed now. */ | |
1558 | #if HAVE_X_WINDOWS | |
1559 | if (x_catching_errors ()) | |
1560 | abort (); | |
1561 | #endif | |
1562 | ||
1563 | c.tag = Qnil; | |
1564 | c.val = Qnil; | |
1565 | c.backlist = backtrace_list; | |
1566 | c.handlerlist = handlerlist; | |
1567 | c.lisp_eval_depth = lisp_eval_depth; | |
1568 | c.pdlcount = SPECPDL_INDEX (); | |
1569 | c.poll_suppress_count = poll_suppress_count; | |
1570 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1571 | c.gcpro = gcprolist; | |
1572 | c.byte_stack = byte_stack_list; | |
1573 | if (_setjmp (c.jmp)) | |
1574 | { | |
1575 | return (*hfun) (c.val); | |
1576 | } | |
1577 | c.next = catchlist; | |
1578 | catchlist = &c; | |
1579 | h.handler = handlers; | |
1580 | h.var = Qnil; | |
1581 | h.next = handlerlist; | |
1582 | h.tag = &c; | |
1583 | handlerlist = &h; | |
1584 | ||
1585 | val = (*bfun) (arg1, arg2); | |
1586 | catchlist = c.next; | |
1587 | handlerlist = h.next; | |
1588 | return val; | |
1589 | } | |
10b29d41 | 1590 | |
2659a09f | 1591 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1592 | and ARGS as second argument. */ |
1593 | ||
1594 | Lisp_Object | |
c5101a77 PE |
1595 | internal_condition_case_n (Lisp_Object (*bfun) (size_t, Lisp_Object *), |
1596 | size_t nargs, | |
178f2507 SM |
1597 | Lisp_Object *args, |
1598 | Lisp_Object handlers, | |
1599 | Lisp_Object (*hfun) (Lisp_Object)) | |
10b29d41 GM |
1600 | { |
1601 | Lisp_Object val; | |
1602 | struct catchtag c; | |
1603 | struct handler h; | |
1604 | ||
88019a63 RS |
1605 | /* Since Fsignal will close off all calls to x_catch_errors, |
1606 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1607 | #if HAVE_X_WINDOWS |
88019a63 RS |
1608 | if (x_catching_errors ()) |
1609 | abort (); | |
a2a103bb | 1610 | #endif |
88019a63 | 1611 | |
10b29d41 GM |
1612 | c.tag = Qnil; |
1613 | c.val = Qnil; | |
1614 | c.backlist = backtrace_list; | |
1615 | c.handlerlist = handlerlist; | |
1616 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1617 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1618 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1619 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1620 | c.gcpro = gcprolist; |
1621 | c.byte_stack = byte_stack_list; | |
1622 | if (_setjmp (c.jmp)) | |
1623 | { | |
1624 | return (*hfun) (c.val); | |
1625 | } | |
1626 | c.next = catchlist; | |
1627 | catchlist = &c; | |
1628 | h.handler = handlers; | |
1629 | h.var = Qnil; | |
1630 | h.next = handlerlist; | |
1631 | h.tag = &c; | |
1632 | handlerlist = &h; | |
1633 | ||
1634 | val = (*bfun) (nargs, args); | |
1635 | catchlist = c.next; | |
1636 | handlerlist = h.next; | |
1637 | return val; | |
1638 | } | |
1639 | ||
d227775c | 1640 | \f |
f57e2426 | 1641 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object, |
bb8e180f | 1642 | Lisp_Object, Lisp_Object); |
e7f7fbaa SM |
1643 | static int maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1644 | Lisp_Object data); | |
db9f0278 JB |
1645 | |
1646 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
9dbc9081 PJ |
1647 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1648 | This function does not return. | |
1649 | ||
1650 | An error symbol is a symbol with an `error-conditions' property | |
1651 | that is a list of condition names. | |
1652 | A handler for any of those names will get to handle this signal. | |
1653 | The symbol `error' should normally be one of them. | |
1654 | ||
1655 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1656 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1657 | error message is constructed. | |
9dbc9081 PJ |
1658 | If the signal is handled, DATA is made available to the handler. |
1659 | See also the function `condition-case'. */) | |
5842a27b | 1660 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1661 | { |
bfa8ca43 | 1662 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1663 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1664 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1665 | Lisp_Object conditions; |
c11d3d17 | 1666 | Lisp_Object string; |
e7f7fbaa SM |
1667 | Lisp_Object real_error_symbol |
1668 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1669 | register Lisp_Object clause = Qnil; | |
1670 | struct handler *h; | |
a2ff3819 | 1671 | struct backtrace *bp; |
db9f0278 | 1672 | |
346598f1 | 1673 | immediate_quit = handling_signal = 0; |
d063129f | 1674 | abort_on_gc = 0; |
db9f0278 JB |
1675 | if (gc_in_progress || waiting_for_input) |
1676 | abort (); | |
1677 | ||
26631f2b RS |
1678 | #if 0 /* rms: I don't know why this was here, |
1679 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1680 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1681 | if (display_hourglass_p) |
1682 | cancel_hourglass (); | |
48f8dfa3 | 1683 | #endif |
177c0ea7 | 1684 | #endif |
48f8dfa3 | 1685 | |
61ede770 | 1686 | /* This hook is used by edebug. */ |
26631f2b RS |
1687 | if (! NILP (Vsignal_hook_function) |
1688 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1689 | { |
1690 | /* Edebug takes care of restoring these variables when it exits. */ | |
1691 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1692 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1693 | ||
1694 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1695 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1696 | ||
1697 | call2 (Vsignal_hook_function, error_symbol, data); | |
1698 | } | |
61ede770 | 1699 | |
1ea9dec4 | 1700 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1701 | |
a2ff3819 GM |
1702 | /* Remember from where signal was called. Skip over the frame for |
1703 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1704 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1705 | is a memory-full error. */ | |
090a072f | 1706 | Vsignaling_function = Qnil; |
26631f2b | 1707 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1708 | { |
1709 | bp = backtrace_list->next; | |
1710 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1711 | bp = bp->next; | |
1712 | if (bp && bp->function) | |
1713 | Vsignaling_function = *bp->function; | |
1714 | } | |
a2ff3819 | 1715 | |
e7f7fbaa | 1716 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1717 | { |
e7f7fbaa | 1718 | clause = find_handler_clause (h->handler, conditions, |
f01cbfdd | 1719 | error_symbol, data); |
265a9e55 | 1720 | if (!NILP (clause)) |
e7f7fbaa | 1721 | break; |
db9f0278 | 1722 | } |
475545b5 | 1723 | |
e7f7fbaa SM |
1724 | if (/* Don't run the debugger for a memory-full error. |
1725 | (There is no room in memory to do that!) */ | |
1726 | !NILP (error_symbol) | |
1727 | && (!NILP (Vdebug_on_signal) | |
1728 | /* If no handler is present now, try to run the debugger. */ | |
1729 | || NILP (clause) | |
1730 | /* Special handler that means "print a message and run debugger | |
1731 | if requested". */ | |
1732 | || EQ (h->handler, Qerror))) | |
1733 | { | |
1734 | int debugger_called | |
1735 | = maybe_call_debugger (conditions, error_symbol, data); | |
1736 | /* We can't return values to code which signaled an error, but we | |
1737 | can continue code which has signaled a quit. */ | |
1738 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
1739 | return Qnil; | |
475545b5 | 1740 | } |
db9f0278 | 1741 | |
e7f7fbaa SM |
1742 | if (!NILP (clause)) |
1743 | { | |
1744 | Lisp_Object unwind_data | |
1745 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 1746 | |
e7f7fbaa SM |
1747 | h->chosen_clause = clause; |
1748 | unwind_to_catch (h->tag, unwind_data); | |
1749 | } | |
1750 | else | |
1751 | { | |
1752 | if (catchlist != 0) | |
1753 | Fthrow (Qtop_level, Qt); | |
1754 | } | |
c11d3d17 | 1755 | |
1ea9dec4 | 1756 | if (! NILP (error_symbol)) |
c11d3d17 | 1757 | data = Fcons (error_symbol, data); |
475545b5 | 1758 | |
c11d3d17 | 1759 | string = Ferror_message_string (data); |
d5db4077 | 1760 | fatal ("%s", SDATA (string), 0); |
db9f0278 JB |
1761 | } |
1762 | ||
734d55a2 KS |
1763 | /* Internal version of Fsignal that never returns. |
1764 | Used for anything but Qquit (which can return from Fsignal). */ | |
1765 | ||
1766 | void | |
d3da34e0 | 1767 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1768 | { |
1769 | Fsignal (error_symbol, data); | |
1770 | abort (); | |
1771 | } | |
1772 | ||
1773 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1774 | ||
1775 | void | |
d3da34e0 | 1776 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1777 | { |
1778 | xsignal (error_symbol, Qnil); | |
1779 | } | |
1780 | ||
1781 | void | |
d3da34e0 | 1782 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1783 | { |
1784 | xsignal (error_symbol, list1 (arg)); | |
1785 | } | |
1786 | ||
1787 | void | |
d3da34e0 | 1788 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1789 | { |
1790 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1791 | } | |
1792 | ||
1793 | void | |
d3da34e0 | 1794 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1795 | { |
1796 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1797 | } | |
1798 | ||
1799 | /* Signal `error' with message S, and additional arg ARG. | |
1800 | If ARG is not a genuine list, make it a one-element list. */ | |
1801 | ||
1802 | void | |
a8fe7202 | 1803 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1804 | { |
1805 | Lisp_Object tortoise, hare; | |
1806 | ||
1807 | hare = tortoise = arg; | |
1808 | while (CONSP (hare)) | |
1809 | { | |
1810 | hare = XCDR (hare); | |
1811 | if (!CONSP (hare)) | |
1812 | break; | |
1813 | ||
1814 | hare = XCDR (hare); | |
1815 | tortoise = XCDR (tortoise); | |
1816 | ||
1817 | if (EQ (hare, tortoise)) | |
1818 | break; | |
1819 | } | |
1820 | ||
1821 | if (!NILP (hare)) | |
1822 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1823 | ||
1824 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1825 | } | |
1826 | ||
1827 | ||
e0f24100 | 1828 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1829 | a list containing one of CONDITIONS. */ |
1830 | ||
1831 | static int | |
d3da34e0 | 1832 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1833 | { |
4de86b16 | 1834 | if (NILP (list)) |
128c0f66 RM |
1835 | return 0; |
1836 | if (! CONSP (list)) | |
1837 | return 1; | |
1838 | ||
ab67260b | 1839 | while (CONSP (conditions)) |
128c0f66 | 1840 | { |
ab67260b | 1841 | Lisp_Object this, tail; |
03699b14 KR |
1842 | this = XCAR (conditions); |
1843 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1844 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1845 | return 1; |
03699b14 | 1846 | conditions = XCDR (conditions); |
128c0f66 | 1847 | } |
ab67260b | 1848 | return 0; |
128c0f66 RM |
1849 | } |
1850 | ||
fc950e09 KH |
1851 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1852 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1853 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1854 | |
1855 | static int | |
d3da34e0 | 1856 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1857 | { |
1858 | Lisp_Object tail; | |
1859 | int first_string = 1; | |
1860 | Lisp_Object error_message; | |
1861 | ||
17401c97 GM |
1862 | error_message = Qnil; |
1863 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1864 | { |
03699b14 | 1865 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1866 | { |
1867 | if (first_string) | |
1868 | { | |
1869 | error_message = Ferror_message_string (data); | |
1870 | first_string = 0; | |
1871 | } | |
177c0ea7 | 1872 | |
03699b14 | 1873 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1874 | return 1; |
1875 | } | |
1876 | else | |
1877 | { | |
1878 | Lisp_Object contail; | |
1879 | ||
17401c97 | 1880 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1881 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1882 | return 1; |
1883 | } | |
1884 | } | |
1885 | ||
1886 | return 0; | |
1887 | } | |
1888 | ||
ddaa36e1 AS |
1889 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
1890 | SIG and DATA describe the signal, as in find_handler_clause. */ | |
1891 | ||
1892 | static int | |
d3da34e0 | 1893 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1894 | { |
1895 | Lisp_Object combined_data; | |
1896 | ||
1897 | combined_data = Fcons (sig, data); | |
1898 | ||
1899 | if ( | |
1900 | /* Don't try to run the debugger with interrupts blocked. | |
1901 | The editing loop would return anyway. */ | |
1902 | ! INPUT_BLOCKED_P | |
1903 | /* Does user want to enter debugger for this kind of error? */ | |
1904 | && (EQ (sig, Qquit) | |
1905 | ? debug_on_quit | |
1906 | : wants_debugger (Vdebug_on_error, conditions)) | |
1907 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1908 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1909 | && when_entered_debugger < num_nonmacro_input_events) |
1910 | { | |
1911 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1912 | return 1; | |
1913 | } | |
1914 | ||
1915 | return 0; | |
1916 | } | |
1917 | ||
128c0f66 | 1918 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1919 | There are two ways to pass SIG and DATA: |
9b942ebd | 1920 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1921 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1922 | This is for memory-full errors only. |
1ea9dec4 | 1923 | |
9f5903bb RS |
1924 | We need to increase max_specpdl_size temporarily around |
1925 | anything we do that can push on the specpdl, so as not to get | |
1926 | a second error here in case we're handling specpdl overflow. */ | |
db9f0278 JB |
1927 | |
1928 | static Lisp_Object | |
d3da34e0 JB |
1929 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions, |
1930 | Lisp_Object sig, Lisp_Object data) | |
db9f0278 JB |
1931 | { |
1932 | register Lisp_Object h; | |
db9f0278 | 1933 | |
f01cbfdd RS |
1934 | /* t is used by handlers for all conditions, set up by C code. */ |
1935 | if (EQ (handlers, Qt)) | |
db9f0278 | 1936 | return Qt; |
f01cbfdd | 1937 | |
61ede770 RS |
1938 | /* error is used similarly, but means print an error message |
1939 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1940 | if (EQ (handlers, Qerror)) |
1941 | return Qt; | |
f01cbfdd | 1942 | |
e7f7fbaa | 1943 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1944 | { |
e7f7fbaa SM |
1945 | Lisp_Object handler = XCAR (h); |
1946 | Lisp_Object condit, tem; | |
5f96776a | 1947 | |
5f96776a | 1948 | if (!CONSP (handler)) |
db9f0278 | 1949 | continue; |
e7f7fbaa | 1950 | condit = XCAR (handler); |
5f96776a RS |
1951 | /* Handle a single condition name in handler HANDLER. */ |
1952 | if (SYMBOLP (condit)) | |
1953 | { | |
1954 | tem = Fmemq (Fcar (handler), conditions); | |
1955 | if (!NILP (tem)) | |
1956 | return handler; | |
1957 | } | |
1958 | /* Handle a list of condition names in handler HANDLER. */ | |
1959 | else if (CONSP (condit)) | |
1960 | { | |
f01cbfdd RS |
1961 | Lisp_Object tail; |
1962 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1963 | { |
e7f7fbaa | 1964 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1965 | if (!NILP (tem)) |
e7f7fbaa | 1966 | return handler; |
5f96776a RS |
1967 | } |
1968 | } | |
db9f0278 | 1969 | } |
f01cbfdd | 1970 | |
db9f0278 JB |
1971 | return Qnil; |
1972 | } | |
1973 | ||
db9f0278 | 1974 | |
f6d62986 | 1975 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1976 | void |
b3ffc17c | 1977 | verror (const char *m, va_list ap) |
db9f0278 JB |
1978 | { |
1979 | char buf[200]; | |
5816888b | 1980 | EMACS_INT size = 200; |
9125da08 RS |
1981 | int mlen; |
1982 | char *buffer = buf; | |
9125da08 RS |
1983 | int allocated = 0; |
1984 | Lisp_Object string; | |
1985 | ||
9125da08 | 1986 | mlen = strlen (m); |
db9f0278 JB |
1987 | |
1988 | while (1) | |
9125da08 | 1989 | { |
db063399 | 1990 | EMACS_INT used; |
6a8033e1 | 1991 | used = doprnt (buffer, size, m, m + mlen, ap); |
9125da08 RS |
1992 | if (used < size) |
1993 | break; | |
1994 | size *= 2; | |
1995 | if (allocated) | |
1996 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
1997 | else |
1998 | { | |
1999 | buffer = (char *) xmalloc (size); | |
2000 | allocated = 1; | |
2001 | } | |
9125da08 RS |
2002 | } |
2003 | ||
955f3ff9 | 2004 | string = build_string (buffer); |
9125da08 | 2005 | if (allocated) |
9ae6734f | 2006 | xfree (buffer); |
9125da08 | 2007 | |
734d55a2 | 2008 | xsignal1 (Qerror, string); |
db9f0278 | 2009 | } |
b3ffc17c DN |
2010 | |
2011 | ||
f6d62986 | 2012 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
2013 | |
2014 | /* VARARGS 1 */ | |
2015 | void | |
2016 | error (const char *m, ...) | |
2017 | { | |
2018 | va_list ap; | |
2019 | va_start (ap, m); | |
2020 | verror (m, ap); | |
2021 | va_end (ap); | |
2022 | } | |
db9f0278 | 2023 | \f |
e72706be | 2024 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
2025 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
2026 | This means it contains a description for how to read arguments to give it. | |
2027 | The value is nil for an invalid function or a symbol with no function | |
2028 | definition. | |
2029 | ||
2030 | Interactively callable functions include strings and vectors (treated | |
2031 | as keyboard macros), lambda-expressions that contain a top-level call | |
2032 | to `interactive', autoload definitions made by `autoload' with non-nil | |
2033 | fourth argument, and some of the built-in functions of Lisp. | |
2034 | ||
e72706be RS |
2035 | Also, a symbol satisfies `commandp' if its function definition does so. |
2036 | ||
2037 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2038 | then strings and vectors are not accepted. */) |
5842a27b | 2039 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
2040 | { |
2041 | register Lisp_Object fun; | |
2042 | register Lisp_Object funcar; | |
52b71f49 | 2043 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2044 | |
2045 | fun = function; | |
2046 | ||
52b71f49 SM |
2047 | fun = indirect_function (fun); /* Check cycles. */ |
2048 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2049 | return Qnil; |
db9f0278 | 2050 | |
52b71f49 SM |
2051 | /* Check an `interactive-form' property if present, analogous to the |
2052 | function-documentation property. */ | |
2053 | fun = function; | |
2054 | while (SYMBOLP (fun)) | |
2055 | { | |
2b9aa051 | 2056 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
2057 | if (!NILP (tmp)) |
2058 | if_prop = Qt; | |
2059 | fun = Fsymbol_function (fun); | |
2060 | } | |
2061 | ||
db9f0278 JB |
2062 | /* Emacs primitives are interactive if their DEFUN specifies an |
2063 | interactive spec. */ | |
90165123 | 2064 | if (SUBRP (fun)) |
04724b69 | 2065 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2066 | |
2067 | /* Bytecode objects are interactive if they are long enough to | |
2068 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2069 | where the interactive spec is stored. */ | |
90165123 | 2070 | else if (COMPILEDP (fun)) |
845975f5 | 2071 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2072 | ? Qt : if_prop); |
db9f0278 JB |
2073 | |
2074 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2075 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2076 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2077 | |
2078 | /* Lists may represent commands. */ | |
2079 | if (!CONSP (fun)) | |
2080 | return Qnil; | |
ed16fb98 | 2081 | funcar = XCAR (fun); |
b38b1ec0 | 2082 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
2083 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
2084 | ? Qt : if_prop); | |
23aba0ea | 2085 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 2086 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 2087 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 2088 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2089 | else |
2090 | return Qnil; | |
2091 | } | |
2092 | ||
db9f0278 | 2093 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
2094 | doc: /* Define FUNCTION to autoload from FILE. |
2095 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2096 | Third arg DOCSTRING is documentation for the function. | |
2097 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2098 | Fifth arg TYPE indicates the type of the object: | |
2099 | nil or omitted says FUNCTION is a function, | |
2100 | `keymap' says FUNCTION is really a keymap, and | |
2101 | `macro' or t says FUNCTION is really a macro. | |
2102 | Third through fifth args give info about the real definition. | |
2103 | They default to nil. | |
2104 | If FUNCTION is already defined other than as an autoload, | |
2105 | this does nothing and returns nil. */) | |
5842a27b | 2106 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 2107 | { |
b7826503 PJ |
2108 | CHECK_SYMBOL (function); |
2109 | CHECK_STRING (file); | |
db9f0278 | 2110 | |
f6d62986 | 2111 | /* If function is defined and not as an autoload, don't override. */ |
db9f0278 | 2112 | if (!EQ (XSYMBOL (function)->function, Qunbound) |
90165123 | 2113 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2114 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2115 | return Qnil; |
2116 | ||
7973e637 SM |
2117 | if (NILP (Vpurify_flag)) |
2118 | /* Only add entries after dumping, because the ones before are | |
2119 | not useful and else we get loads of them from the loaddefs.el. */ | |
2120 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
905a9ed3 | 2121 | else |
a56eaaef | 2122 | /* We don't want the docstring in purespace (instead, |
d6d23852 SM |
2123 | Snarf-documentation should (hopefully) overwrite it). |
2124 | We used to use 0 here, but that leads to accidental sharing in | |
2125 | purecopy's hash-consing, so we use a (hopefully) unique integer | |
2126 | instead. */ | |
2127 | docstring = make_number (XHASH (function)); | |
a56eaaef DN |
2128 | return Ffset (function, |
2129 | Fpurecopy (list5 (Qautoload, file, docstring, | |
2130 | interactive, type))); | |
db9f0278 JB |
2131 | } |
2132 | ||
2133 | Lisp_Object | |
d3da34e0 | 2134 | un_autoload (Lisp_Object oldqueue) |
db9f0278 JB |
2135 | { |
2136 | register Lisp_Object queue, first, second; | |
2137 | ||
2138 | /* Queue to unwind is current value of Vautoload_queue. | |
2139 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2140 | queue = Vautoload_queue; | |
2141 | Vautoload_queue = oldqueue; | |
2142 | while (CONSP (queue)) | |
2143 | { | |
e509f168 | 2144 | first = XCAR (queue); |
db9f0278 JB |
2145 | second = Fcdr (first); |
2146 | first = Fcar (first); | |
47b82df9 RS |
2147 | if (EQ (first, make_number (0))) |
2148 | Vfeatures = second; | |
db9f0278 JB |
2149 | else |
2150 | Ffset (first, second); | |
e509f168 | 2151 | queue = XCDR (queue); |
db9f0278 JB |
2152 | } |
2153 | return Qnil; | |
2154 | } | |
2155 | ||
ca20916b RS |
2156 | /* Load an autoloaded function. |
2157 | FUNNAME is the symbol which is the function's name. | |
2158 | FUNDEF is the autoload definition (a list). */ | |
2159 | ||
045ba794 | 2160 | void |
d3da34e0 | 2161 | do_autoload (Lisp_Object fundef, Lisp_Object funname) |
db9f0278 | 2162 | { |
aed13378 | 2163 | int count = SPECPDL_INDEX (); |
d945992e | 2164 | Lisp_Object fun; |
ca20916b | 2165 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2166 | |
aea6173f RS |
2167 | /* This is to make sure that loadup.el gives a clear picture |
2168 | of what files are preloaded and when. */ | |
ab4db096 RS |
2169 | if (! NILP (Vpurify_flag)) |
2170 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2171 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2172 | |
db9f0278 | 2173 | fun = funname; |
b7826503 | 2174 | CHECK_SYMBOL (funname); |
ca20916b | 2175 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2176 | |
f87740dc | 2177 | /* Preserve the match data. */ |
89f2614d | 2178 | record_unwind_save_match_data (); |
177c0ea7 | 2179 | |
a04ee161 RS |
2180 | /* If autoloading gets an error (which includes the error of failing |
2181 | to define the function being called), we use Vautoload_queue | |
2182 | to undo function definitions and `provide' calls made by | |
2183 | the function. We do this in the specific case of autoloading | |
2184 | because autoloading is not an explicit request "load this file", | |
2185 | but rather a request to "call this function". | |
d3da34e0 | 2186 | |
a04ee161 | 2187 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
2188 | record_unwind_protect (un_autoload, Vautoload_queue); |
2189 | Vautoload_queue = Qt; | |
7351b242 | 2190 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2191 | |
db9f0278 JB |
2192 | /* Once loading finishes, don't undo it. */ |
2193 | Vautoload_queue = Qt; | |
2194 | unbind_to (count, Qnil); | |
2195 | ||
a7f96a35 | 2196 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2197 | |
76c2b0cc | 2198 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2199 | error ("Autoloading failed to define function %s", |
d5db4077 | 2200 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2201 | UNGCPRO; |
db9f0278 | 2202 | } |
4c576a83 | 2203 | |
db9f0278 | 2204 | \f |
a0ee6f27 SM |
2205 | DEFUN ("eval", Feval, Seval, 1, 2, 0, |
2206 | doc: /* Evaluate FORM and return its value. | |
2207 | If LEXICAL is t, evaluate using lexical scoping. */) | |
2208 | (Lisp_Object form, Lisp_Object lexical) | |
defb1411 SM |
2209 | { |
2210 | int count = SPECPDL_INDEX (); | |
a0ee6f27 SM |
2211 | specbind (Qinternal_interpreter_environment, |
2212 | NILP (lexical) ? Qnil : Fcons (Qt, Qnil)); | |
defb1411 SM |
2213 | return unbind_to (count, eval_sub (form)); |
2214 | } | |
2215 | ||
2216 | /* Eval a sub-expression of the current expression (i.e. in the same | |
2217 | lexical scope). */ | |
2218 | Lisp_Object | |
2219 | eval_sub (Lisp_Object form) | |
db9f0278 JB |
2220 | { |
2221 | Lisp_Object fun, val, original_fun, original_args; | |
2222 | Lisp_Object funcar; | |
2223 | struct backtrace backtrace; | |
2224 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2225 | ||
df470e3b | 2226 | if (handling_signal) |
48f8dfa3 | 2227 | abort (); |
177c0ea7 | 2228 | |
90165123 | 2229 | if (SYMBOLP (form)) |
b9598260 | 2230 | { |
f07a954e SM |
2231 | /* Look up its binding in the lexical environment. |
2232 | We do not pay attention to the declared_special flag here, since we | |
2233 | already did that when let-binding the variable. */ | |
2234 | Lisp_Object lex_binding | |
2235 | = !NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
2236 | ? Fassq (form, Vinternal_interpreter_environment) | |
2237 | : Qnil; | |
2238 | if (CONSP (lex_binding)) | |
2239 | return XCDR (lex_binding); | |
2240 | else | |
2241 | return Fsymbol_value (form); | |
b9598260 SM |
2242 | } |
2243 | ||
db9f0278 JB |
2244 | if (!CONSP (form)) |
2245 | return form; | |
2246 | ||
2247 | QUIT; | |
ee830945 RS |
2248 | if ((consing_since_gc > gc_cons_threshold |
2249 | && consing_since_gc > gc_relative_threshold) | |
2250 | || | |
2251 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2252 | { |
2253 | GCPRO1 (form); | |
2254 | Fgarbage_collect (); | |
2255 | UNGCPRO; | |
2256 | } | |
2257 | ||
2258 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2259 | { | |
2260 | if (max_lisp_eval_depth < 100) | |
2261 | max_lisp_eval_depth = 100; | |
2262 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2263 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2264 | } |
2265 | ||
2266 | original_fun = Fcar (form); | |
2267 | original_args = Fcdr (form); | |
2268 | ||
2269 | backtrace.next = backtrace_list; | |
2270 | backtrace_list = &backtrace; | |
f6d62986 | 2271 | backtrace.function = &original_fun; /* This also protects them from gc. */ |
db9f0278 JB |
2272 | backtrace.args = &original_args; |
2273 | backtrace.nargs = UNEVALLED; | |
2274 | backtrace.evalargs = 1; | |
2275 | backtrace.debug_on_exit = 0; | |
2276 | ||
2277 | if (debug_on_next_call) | |
2278 | do_debug_on_call (Qt); | |
2279 | ||
2280 | /* At this point, only original_fun and original_args | |
f6d62986 | 2281 | have values that will be used below. */ |
db9f0278 | 2282 | retry: |
8788120f KS |
2283 | |
2284 | /* Optimize for no indirection. */ | |
2285 | fun = original_fun; | |
2286 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2287 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2288 | fun = indirect_function (fun); | |
db9f0278 | 2289 | |
90165123 | 2290 | if (SUBRP (fun)) |
db9f0278 JB |
2291 | { |
2292 | Lisp_Object numargs; | |
166c822d | 2293 | Lisp_Object argvals[8]; |
db9f0278 JB |
2294 | Lisp_Object args_left; |
2295 | register int i, maxargs; | |
2296 | ||
2297 | args_left = original_args; | |
2298 | numargs = Flength (args_left); | |
2299 | ||
c1788fbc RS |
2300 | CHECK_CONS_LIST (); |
2301 | ||
f6d62986 SM |
2302 | if (XINT (numargs) < XSUBR (fun)->min_args |
2303 | || (XSUBR (fun)->max_args >= 0 | |
2304 | && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2305 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2306 | |
ef1b0ba7 | 2307 | else if (XSUBR (fun)->max_args == UNEVALLED) |
db9f0278 JB |
2308 | { |
2309 | backtrace.evalargs = 0; | |
d5273788 | 2310 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
db9f0278 | 2311 | } |
ef1b0ba7 | 2312 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 | 2313 | { |
f6d62986 | 2314 | /* Pass a vector of evaluated arguments. */ |
db9f0278 | 2315 | Lisp_Object *vals; |
c5101a77 | 2316 | register size_t argnum = 0; |
3a7a9129 | 2317 | USE_SAFE_ALLOCA; |
db9f0278 | 2318 | |
b72e0717 | 2319 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2320 | |
2321 | GCPRO3 (args_left, fun, fun); | |
2322 | gcpro3.var = vals; | |
2323 | gcpro3.nvars = 0; | |
2324 | ||
265a9e55 | 2325 | while (!NILP (args_left)) |
db9f0278 | 2326 | { |
defb1411 | 2327 | vals[argnum++] = eval_sub (Fcar (args_left)); |
db9f0278 JB |
2328 | args_left = Fcdr (args_left); |
2329 | gcpro3.nvars = argnum; | |
2330 | } | |
db9f0278 JB |
2331 | |
2332 | backtrace.args = vals; | |
2333 | backtrace.nargs = XINT (numargs); | |
2334 | ||
d5273788 | 2335 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2336 | UNGCPRO; |
3a7a9129 | 2337 | SAFE_FREE (); |
db9f0278 | 2338 | } |
ef1b0ba7 | 2339 | else |
db9f0278 | 2340 | { |
ef1b0ba7 SM |
2341 | GCPRO3 (args_left, fun, fun); |
2342 | gcpro3.var = argvals; | |
2343 | gcpro3.nvars = 0; | |
db9f0278 | 2344 | |
ef1b0ba7 SM |
2345 | maxargs = XSUBR (fun)->max_args; |
2346 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2347 | { | |
a0ee6f27 | 2348 | argvals[i] = eval_sub (Fcar (args_left)); |
ef1b0ba7 SM |
2349 | gcpro3.nvars = ++i; |
2350 | } | |
db9f0278 | 2351 | |
ef1b0ba7 | 2352 | UNGCPRO; |
db9f0278 | 2353 | |
ef1b0ba7 SM |
2354 | backtrace.args = argvals; |
2355 | backtrace.nargs = XINT (numargs); | |
2356 | ||
2357 | switch (i) | |
2358 | { | |
2359 | case 0: | |
2360 | val = (XSUBR (fun)->function.a0 ()); | |
2361 | break; | |
2362 | case 1: | |
2363 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2364 | break; | |
2365 | case 2: | |
2366 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2367 | break; | |
2368 | case 3: | |
2369 | val = (XSUBR (fun)->function.a3 | |
2370 | (argvals[0], argvals[1], argvals[2])); | |
2371 | break; | |
2372 | case 4: | |
2373 | val = (XSUBR (fun)->function.a4 | |
2374 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2375 | break; | |
2376 | case 5: | |
2377 | val = (XSUBR (fun)->function.a5 | |
2378 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2379 | argvals[4])); | |
2380 | break; | |
2381 | case 6: | |
2382 | val = (XSUBR (fun)->function.a6 | |
2383 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2384 | argvals[4], argvals[5])); | |
2385 | break; | |
2386 | case 7: | |
2387 | val = (XSUBR (fun)->function.a7 | |
2388 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2389 | argvals[4], argvals[5], argvals[6])); | |
2390 | break; | |
2391 | ||
2392 | case 8: | |
2393 | val = (XSUBR (fun)->function.a8 | |
2394 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2395 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2396 | break; | |
2397 | ||
2398 | default: | |
2399 | /* Someone has created a subr that takes more arguments than | |
2400 | is supported by this code. We need to either rewrite the | |
2401 | subr to use a different argument protocol, or add more | |
2402 | cases to this switch. */ | |
2403 | abort (); | |
2404 | } | |
db9f0278 JB |
2405 | } |
2406 | } | |
ef1b0ba7 | 2407 | else if (COMPILEDP (fun)) |
defb1411 | 2408 | val = apply_lambda (fun, original_args); |
db9f0278 JB |
2409 | else |
2410 | { | |
8788120f | 2411 | if (EQ (fun, Qunbound)) |
734d55a2 | 2412 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2413 | if (!CONSP (fun)) |
734d55a2 KS |
2414 | xsignal1 (Qinvalid_function, original_fun); |
2415 | funcar = XCAR (fun); | |
90165123 | 2416 | if (!SYMBOLP (funcar)) |
734d55a2 | 2417 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2418 | if (EQ (funcar, Qautoload)) |
2419 | { | |
2420 | do_autoload (fun, original_fun); | |
2421 | goto retry; | |
2422 | } | |
2423 | if (EQ (funcar, Qmacro)) | |
defb1411 SM |
2424 | val = eval_sub (apply1 (Fcdr (fun), original_args)); |
2425 | else if (EQ (funcar, Qlambda) | |
2426 | || EQ (funcar, Qclosure)) | |
2427 | val = apply_lambda (fun, original_args); | |
db9f0278 | 2428 | else |
734d55a2 | 2429 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2430 | } |
c1788fbc RS |
2431 | CHECK_CONS_LIST (); |
2432 | ||
db9f0278 JB |
2433 | lisp_eval_depth--; |
2434 | if (backtrace.debug_on_exit) | |
2435 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2436 | backtrace_list = backtrace.next; | |
824eb35e | 2437 | |
db9f0278 JB |
2438 | return val; |
2439 | } | |
2440 | \f | |
2441 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
9dbc9081 PJ |
2442 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2443 | Then return the value FUNCTION returns. | |
2444 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2445 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
c5101a77 | 2446 | (size_t nargs, Lisp_Object *args) |
db9f0278 | 2447 | { |
c5101a77 | 2448 | register size_t i, numargs; |
db9f0278 JB |
2449 | register Lisp_Object spread_arg; |
2450 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2451 | Lisp_Object fun, retval; |
96d44c64 | 2452 | struct gcpro gcpro1; |
3a7a9129 | 2453 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2454 | |
2455 | fun = args [0]; | |
2456 | funcall_args = 0; | |
2457 | spread_arg = args [nargs - 1]; | |
b7826503 | 2458 | CHECK_LIST (spread_arg); |
177c0ea7 | 2459 | |
db9f0278 JB |
2460 | numargs = XINT (Flength (spread_arg)); |
2461 | ||
2462 | if (numargs == 0) | |
2463 | return Ffuncall (nargs - 1, args); | |
2464 | else if (numargs == 1) | |
2465 | { | |
03699b14 | 2466 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2467 | return Ffuncall (nargs, args); |
2468 | } | |
2469 | ||
a6e3fa71 | 2470 | numargs += nargs - 2; |
db9f0278 | 2471 | |
8788120f KS |
2472 | /* Optimize for no indirection. */ |
2473 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2474 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2475 | fun = indirect_function (fun); | |
ffd56f97 | 2476 | if (EQ (fun, Qunbound)) |
db9f0278 | 2477 | { |
f6d62986 | 2478 | /* Let funcall get the error. */ |
ffd56f97 JB |
2479 | fun = args[0]; |
2480 | goto funcall; | |
db9f0278 JB |
2481 | } |
2482 | ||
90165123 | 2483 | if (SUBRP (fun)) |
db9f0278 JB |
2484 | { |
2485 | if (numargs < XSUBR (fun)->min_args | |
2486 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
f6d62986 | 2487 | goto funcall; /* Let funcall get the error. */ |
c5101a77 | 2488 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2489 | { |
2490 | /* Avoid making funcall cons up a yet another new vector of arguments | |
f6d62986 | 2491 | by explicitly supplying nil's for optional values. */ |
b72e0717 | 2492 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2493 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2494 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2495 | GCPRO1 (*funcall_args); |
2496 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2497 | } |
2498 | } | |
2499 | funcall: | |
2500 | /* We add 1 to numargs because funcall_args includes the | |
2501 | function itself as well as its arguments. */ | |
2502 | if (!funcall_args) | |
a6e3fa71 | 2503 | { |
b72e0717 | 2504 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2505 | GCPRO1 (*funcall_args); |
2506 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2507 | } |
2508 | ||
72af86bd | 2509 | memcpy (funcall_args, args, nargs * sizeof (Lisp_Object)); |
db9f0278 JB |
2510 | /* Spread the last arg we got. Its first element goes in |
2511 | the slot that it used to occupy, hence this value of I. */ | |
2512 | i = nargs - 1; | |
265a9e55 | 2513 | while (!NILP (spread_arg)) |
db9f0278 | 2514 | { |
03699b14 KR |
2515 | funcall_args [i++] = XCAR (spread_arg); |
2516 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2517 | } |
a6e3fa71 | 2518 | |
96d44c64 | 2519 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2520 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2521 | UNGCPRO; | |
2522 | SAFE_FREE (); | |
2523 | ||
2524 | return retval; | |
db9f0278 JB |
2525 | } |
2526 | \f | |
ff936e53 SM |
2527 | /* Run hook variables in various ways. */ |
2528 | ||
f6d62986 | 2529 | static Lisp_Object |
82892965 | 2530 | funcall_nil (size_t nargs, Lisp_Object *args) |
f6d62986 SM |
2531 | { |
2532 | Ffuncall (nargs, args); | |
2533 | return Qnil; | |
2534 | } | |
ff936e53 | 2535 | |
8b5176cd | 2536 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2537 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2538 | Each argument should be a symbol, a hook variable. |
2539 | These symbols are processed in the order specified. | |
2540 | If a hook symbol has a non-nil value, that value may be a function | |
2541 | or a list of functions to be called to run the hook. | |
2542 | If the value is a function, it is called with no arguments. | |
2543 | If it is a list, the elements are called, in order, with no arguments. | |
2544 | ||
9f685258 LK |
2545 | Major modes should not use this function directly to run their mode |
2546 | hook; they should use `run-mode-hooks' instead. | |
2547 | ||
72e85d5d RS |
2548 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2549 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2550 | usage: (run-hooks &rest HOOKS) */) |
c5101a77 | 2551 | (size_t nargs, Lisp_Object *args) |
ff936e53 SM |
2552 | { |
2553 | Lisp_Object hook[1]; | |
c5101a77 | 2554 | register size_t i; |
ff936e53 SM |
2555 | |
2556 | for (i = 0; i < nargs; i++) | |
2557 | { | |
2558 | hook[0] = args[i]; | |
f6d62986 | 2559 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
2560 | } |
2561 | ||
2562 | return Qnil; | |
2563 | } | |
177c0ea7 | 2564 | |
a0d76c27 | 2565 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2566 | Srun_hook_with_args, 1, MANY, 0, |
2567 | doc: /* Run HOOK with the specified arguments ARGS. | |
2568 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2569 | value, that value may be a function or a list of functions to be | |
2570 | called to run the hook. If the value is a function, it is called with | |
2571 | the given arguments and its return value is returned. If it is a list | |
2572 | of functions, those functions are called, in order, | |
2573 | with the given arguments ARGS. | |
d5e2c90c | 2574 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2575 | as that may change. |
2576 | ||
72e85d5d RS |
2577 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2578 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2579 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
c5101a77 | 2580 | (size_t nargs, Lisp_Object *args) |
ff936e53 | 2581 | { |
f6d62986 | 2582 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
2583 | } |
2584 | ||
a0d76c27 | 2585 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2586 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2587 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2588 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2589 | value, that value may be a function or a list of functions to be | |
2590 | called to run the hook. If the value is a function, it is called with | |
2591 | the given arguments and its return value is returned. | |
2592 | If it is a list of functions, those functions are called, in order, | |
2593 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2594 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2595 | However, if they all return nil, we return nil. |
9dbc9081 | 2596 | |
72e85d5d RS |
2597 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2598 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2599 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
c5101a77 | 2600 | (size_t nargs, Lisp_Object *args) |
b0b667cb | 2601 | { |
f6d62986 SM |
2602 | return run_hook_with_args (nargs, args, Ffuncall); |
2603 | } | |
2604 | ||
2605 | static Lisp_Object | |
82892965 | 2606 | funcall_not (size_t nargs, Lisp_Object *args) |
f6d62986 SM |
2607 | { |
2608 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
2609 | } |
2610 | ||
a0d76c27 | 2611 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2612 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2613 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2614 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2615 | value, that value may be a function or a list of functions to be | |
2616 | called to run the hook. If the value is a function, it is called with | |
2617 | the given arguments and its return value is returned. | |
2618 | If it is a list of functions, those functions are called, in order, | |
2619 | with the given arguments ARGS, until one of them returns nil. | |
2620 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2621 | |
72e85d5d RS |
2622 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2623 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2624 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
c5101a77 | 2625 | (size_t nargs, Lisp_Object *args) |
ff936e53 | 2626 | { |
f6d62986 | 2627 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
2628 | } |
2629 | ||
f6d62986 | 2630 | static Lisp_Object |
82892965 | 2631 | run_hook_wrapped_funcall (size_t nargs, Lisp_Object *args) |
f6d62986 SM |
2632 | { |
2633 | Lisp_Object tmp = args[0], ret; | |
2634 | args[0] = args[1]; | |
2635 | args[1] = tmp; | |
2636 | ret = Ffuncall (nargs, args); | |
2637 | args[1] = args[0]; | |
2638 | args[0] = tmp; | |
2639 | return ret; | |
2640 | } | |
2641 | ||
2642 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
2643 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
2644 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
2645 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
2646 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
2647 | aborts and returns that value. | |
2648 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
82892965 | 2649 | (size_t nargs, Lisp_Object *args) |
f6d62986 SM |
2650 | { |
2651 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
2652 | } | |
ff936e53 | 2653 | |
c933ea05 RS |
2654 | /* ARGS[0] should be a hook symbol. |
2655 | Call each of the functions in the hook value, passing each of them | |
2656 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 2657 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
2658 | The caller (or its caller, etc) must gcpro all of ARGS, |
2659 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2660 | ||
f6d62986 | 2661 | Lisp_Object |
c5101a77 | 2662 | run_hook_with_args (size_t nargs, Lisp_Object *args, |
82892965 | 2663 | Lisp_Object (*funcall) (size_t nargs, Lisp_Object *args)) |
ff936e53 | 2664 | { |
f6d62986 | 2665 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 2666 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2667 | |
f029ca5f RS |
2668 | /* If we are dying or still initializing, |
2669 | don't do anything--it would probably crash if we tried. */ | |
2670 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2671 | return Qnil; |
f029ca5f | 2672 | |
b0b667cb | 2673 | sym = args[0]; |
aa681b51 | 2674 | val = find_symbol_value (sym); |
ff936e53 | 2675 | |
b0b667cb | 2676 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2677 | return ret; |
03699b14 | 2678 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2679 | { |
2680 | args[0] = val; | |
f6d62986 | 2681 | return funcall (nargs, args); |
b0b667cb KH |
2682 | } |
2683 | else | |
2684 | { | |
1faed8ae PE |
2685 | Lisp_Object global_vals = Qnil; |
2686 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2687 | |
ff936e53 | 2688 | for (; |
f6d62986 | 2689 | CONSP (val) && NILP (ret); |
03699b14 | 2690 | val = XCDR (val)) |
b0b667cb | 2691 | { |
03699b14 | 2692 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2693 | { |
2694 | /* t indicates this hook has a local binding; | |
2695 | it means to run the global binding too. */ | |
1faed8ae PE |
2696 | global_vals = Fdefault_value (sym); |
2697 | if (NILP (global_vals)) continue; | |
b0b667cb | 2698 | |
1faed8ae | 2699 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2700 | { |
1faed8ae | 2701 | args[0] = global_vals; |
f6d62986 | 2702 | ret = funcall (nargs, args); |
8932b1c2 CY |
2703 | } |
2704 | else | |
2705 | { | |
2706 | for (; | |
f6d62986 | 2707 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 2708 | global_vals = XCDR (global_vals)) |
8932b1c2 | 2709 | { |
1faed8ae | 2710 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2711 | /* In a global value, t should not occur. If it does, we |
2712 | must ignore it to avoid an endless loop. */ | |
2713 | if (!EQ (args[0], Qt)) | |
f6d62986 | 2714 | ret = funcall (nargs, args); |
8932b1c2 | 2715 | } |
b0b667cb KH |
2716 | } |
2717 | } | |
2718 | else | |
2719 | { | |
03699b14 | 2720 | args[0] = XCAR (val); |
f6d62986 | 2721 | ret = funcall (nargs, args); |
b0b667cb KH |
2722 | } |
2723 | } | |
cb9d21f8 RS |
2724 | |
2725 | UNGCPRO; | |
ff936e53 | 2726 | return ret; |
b0b667cb KH |
2727 | } |
2728 | } | |
c933ea05 | 2729 | |
7d48558f RS |
2730 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2731 | ||
2732 | void | |
d3da34e0 | 2733 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2734 | { |
2735 | Lisp_Object temp[3]; | |
2736 | temp[0] = hook; | |
2737 | temp[1] = arg1; | |
2738 | temp[2] = arg2; | |
2739 | ||
2740 | Frun_hook_with_args (3, temp); | |
2741 | } | |
ff936e53 | 2742 | \f |
f6d62986 | 2743 | /* Apply fn to arg. */ |
db9f0278 | 2744 | Lisp_Object |
d3da34e0 | 2745 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2746 | { |
a6e3fa71 JB |
2747 | struct gcpro gcpro1; |
2748 | ||
2749 | GCPRO1 (fn); | |
265a9e55 | 2750 | if (NILP (arg)) |
a6e3fa71 JB |
2751 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2752 | gcpro1.nvars = 2; | |
db9f0278 JB |
2753 | { |
2754 | Lisp_Object args[2]; | |
2755 | args[0] = fn; | |
2756 | args[1] = arg; | |
a6e3fa71 JB |
2757 | gcpro1.var = args; |
2758 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2759 | } |
db9f0278 JB |
2760 | } |
2761 | ||
f6d62986 | 2762 | /* Call function fn on no arguments. */ |
db9f0278 | 2763 | Lisp_Object |
d3da34e0 | 2764 | call0 (Lisp_Object fn) |
db9f0278 | 2765 | { |
a6e3fa71 JB |
2766 | struct gcpro gcpro1; |
2767 | ||
2768 | GCPRO1 (fn); | |
2769 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2770 | } |
2771 | ||
f6d62986 | 2772 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
2773 | /* ARGSUSED */ |
2774 | Lisp_Object | |
d3da34e0 | 2775 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2776 | { |
a6e3fa71 | 2777 | struct gcpro gcpro1; |
177c0ea7 | 2778 | Lisp_Object args[2]; |
a6e3fa71 | 2779 | |
db9f0278 | 2780 | args[0] = fn; |
15285f9f | 2781 | args[1] = arg1; |
a6e3fa71 JB |
2782 | GCPRO1 (args[0]); |
2783 | gcpro1.nvars = 2; | |
2784 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2785 | } |
2786 | ||
f6d62986 | 2787 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
2788 | /* ARGSUSED */ |
2789 | Lisp_Object | |
d3da34e0 | 2790 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2791 | { |
a6e3fa71 | 2792 | struct gcpro gcpro1; |
db9f0278 JB |
2793 | Lisp_Object args[3]; |
2794 | args[0] = fn; | |
15285f9f RS |
2795 | args[1] = arg1; |
2796 | args[2] = arg2; | |
a6e3fa71 JB |
2797 | GCPRO1 (args[0]); |
2798 | gcpro1.nvars = 3; | |
2799 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2800 | } |
2801 | ||
f6d62986 | 2802 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
2803 | /* ARGSUSED */ |
2804 | Lisp_Object | |
d3da34e0 | 2805 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2806 | { |
a6e3fa71 | 2807 | struct gcpro gcpro1; |
db9f0278 JB |
2808 | Lisp_Object args[4]; |
2809 | args[0] = fn; | |
15285f9f RS |
2810 | args[1] = arg1; |
2811 | args[2] = arg2; | |
2812 | args[3] = arg3; | |
a6e3fa71 JB |
2813 | GCPRO1 (args[0]); |
2814 | gcpro1.nvars = 4; | |
2815 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2816 | } |
2817 | ||
f6d62986 | 2818 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
2819 | /* ARGSUSED */ |
2820 | Lisp_Object | |
d3da34e0 JB |
2821 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2822 | Lisp_Object arg4) | |
a5a44b91 JB |
2823 | { |
2824 | struct gcpro gcpro1; | |
a5a44b91 JB |
2825 | Lisp_Object args[5]; |
2826 | args[0] = fn; | |
15285f9f RS |
2827 | args[1] = arg1; |
2828 | args[2] = arg2; | |
2829 | args[3] = arg3; | |
2830 | args[4] = arg4; | |
a5a44b91 JB |
2831 | GCPRO1 (args[0]); |
2832 | gcpro1.nvars = 5; | |
2833 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2834 | } |
2835 | ||
f6d62986 | 2836 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
2837 | /* ARGSUSED */ |
2838 | Lisp_Object | |
d3da34e0 JB |
2839 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2840 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2841 | { |
2842 | struct gcpro gcpro1; | |
15285f9f RS |
2843 | Lisp_Object args[6]; |
2844 | args[0] = fn; | |
2845 | args[1] = arg1; | |
2846 | args[2] = arg2; | |
2847 | args[3] = arg3; | |
2848 | args[4] = arg4; | |
2849 | args[5] = arg5; | |
2850 | GCPRO1 (args[0]); | |
2851 | gcpro1.nvars = 6; | |
2852 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2853 | } |
2854 | ||
f6d62986 | 2855 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
2856 | /* ARGSUSED */ |
2857 | Lisp_Object | |
d3da34e0 JB |
2858 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2859 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2860 | { |
2861 | struct gcpro gcpro1; | |
15285f9f RS |
2862 | Lisp_Object args[7]; |
2863 | args[0] = fn; | |
2864 | args[1] = arg1; | |
2865 | args[2] = arg2; | |
2866 | args[3] = arg3; | |
2867 | args[4] = arg4; | |
2868 | args[5] = arg5; | |
2869 | args[6] = arg6; | |
2870 | GCPRO1 (args[0]); | |
2871 | gcpro1.nvars = 7; | |
2872 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2873 | } |
2874 | ||
f6d62986 | 2875 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
2876 | /* ARGSUSED */ |
2877 | Lisp_Object | |
d3da34e0 JB |
2878 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2879 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2880 | { |
2881 | struct gcpro gcpro1; | |
574c05e2 KK |
2882 | Lisp_Object args[8]; |
2883 | args[0] = fn; | |
2884 | args[1] = arg1; | |
2885 | args[2] = arg2; | |
2886 | args[3] = arg3; | |
2887 | args[4] = arg4; | |
2888 | args[5] = arg5; | |
2889 | args[6] = arg6; | |
2890 | args[7] = arg7; | |
2891 | GCPRO1 (args[0]); | |
2892 | gcpro1.nvars = 8; | |
2893 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2894 | } |
2895 | ||
6c2ef893 RS |
2896 | /* The caller should GCPRO all the elements of ARGS. */ |
2897 | ||
b9598260 | 2898 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 2899 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 2900 | (Lisp_Object object) |
b9598260 SM |
2901 | { |
2902 | if (SYMBOLP (object) && !NILP (Ffboundp (object))) | |
2903 | { | |
ba83908c | 2904 | object = Findirect_function (object, Qt); |
b9598260 SM |
2905 | |
2906 | if (CONSP (object) && EQ (XCAR (object), Qautoload)) | |
2907 | { | |
2908 | /* Autoloaded symbols are functions, except if they load | |
2909 | macros or keymaps. */ | |
2910 | int i; | |
2911 | for (i = 0; i < 4 && CONSP (object); i++) | |
2912 | object = XCDR (object); | |
2913 | ||
2914 | return (CONSP (object) && !NILP (XCAR (object))) ? Qnil : Qt; | |
2915 | } | |
2916 | } | |
2917 | ||
2918 | if (SUBRP (object)) | |
3c3ddb98 | 2919 | return (XSUBR (object)->max_args != UNEVALLED) ? Qt : Qnil; |
876c194c | 2920 | else if (COMPILEDP (object)) |
b9598260 SM |
2921 | return Qt; |
2922 | else if (CONSP (object)) | |
2923 | { | |
2924 | Lisp_Object car = XCAR (object); | |
2925 | return (EQ (car, Qlambda) || EQ (car, Qclosure)) ? Qt : Qnil; | |
2926 | } | |
2927 | else | |
2928 | return Qnil; | |
2929 | } | |
2930 | ||
db9f0278 | 2931 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2932 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2933 | Return the value that function returns. | |
2934 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2935 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
c5101a77 | 2936 | (size_t nargs, Lisp_Object *args) |
db9f0278 | 2937 | { |
8788120f | 2938 | Lisp_Object fun, original_fun; |
db9f0278 | 2939 | Lisp_Object funcar; |
c5101a77 | 2940 | size_t numargs = nargs - 1; |
db9f0278 JB |
2941 | Lisp_Object lisp_numargs; |
2942 | Lisp_Object val; | |
2943 | struct backtrace backtrace; | |
2944 | register Lisp_Object *internal_args; | |
c5101a77 | 2945 | register size_t i; |
db9f0278 JB |
2946 | |
2947 | QUIT; | |
ee830945 RS |
2948 | if ((consing_since_gc > gc_cons_threshold |
2949 | && consing_since_gc > gc_relative_threshold) | |
2950 | || | |
2951 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 2952 | Fgarbage_collect (); |
db9f0278 JB |
2953 | |
2954 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2955 | { | |
2956 | if (max_lisp_eval_depth < 100) | |
2957 | max_lisp_eval_depth = 100; | |
2958 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2959 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2960 | } |
2961 | ||
2962 | backtrace.next = backtrace_list; | |
2963 | backtrace_list = &backtrace; | |
2964 | backtrace.function = &args[0]; | |
2965 | backtrace.args = &args[1]; | |
2966 | backtrace.nargs = nargs - 1; | |
2967 | backtrace.evalargs = 0; | |
2968 | backtrace.debug_on_exit = 0; | |
2969 | ||
2970 | if (debug_on_next_call) | |
2971 | do_debug_on_call (Qlambda); | |
2972 | ||
fff3ff9c KS |
2973 | CHECK_CONS_LIST (); |
2974 | ||
8788120f KS |
2975 | original_fun = args[0]; |
2976 | ||
db9f0278 JB |
2977 | retry: |
2978 | ||
8788120f KS |
2979 | /* Optimize for no indirection. */ |
2980 | fun = original_fun; | |
2981 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2982 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2983 | fun = indirect_function (fun); | |
db9f0278 | 2984 | |
90165123 | 2985 | if (SUBRP (fun)) |
db9f0278 | 2986 | { |
ef1b0ba7 | 2987 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
2988 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
2989 | { | |
a631e24c | 2990 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 2991 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
2992 | } |
2993 | ||
ef1b0ba7 | 2994 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 2995 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2996 | |
ef1b0ba7 SM |
2997 | else if (XSUBR (fun)->max_args == MANY) |
2998 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 2999 | else |
db9f0278 | 3000 | { |
ef1b0ba7 SM |
3001 | if (XSUBR (fun)->max_args > numargs) |
3002 | { | |
3003 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
3004 | memcpy (internal_args, args + 1, numargs * sizeof (Lisp_Object)); | |
3005 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
3006 | internal_args[i] = Qnil; | |
3007 | } | |
3008 | else | |
3009 | internal_args = args + 1; | |
3010 | switch (XSUBR (fun)->max_args) | |
3011 | { | |
3012 | case 0: | |
3013 | val = (XSUBR (fun)->function.a0 ()); | |
3014 | break; | |
3015 | case 1: | |
3016 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
3017 | break; | |
3018 | case 2: | |
3019 | val = (XSUBR (fun)->function.a2 | |
3020 | (internal_args[0], internal_args[1])); | |
3021 | break; | |
3022 | case 3: | |
3023 | val = (XSUBR (fun)->function.a3 | |
3024 | (internal_args[0], internal_args[1], internal_args[2])); | |
3025 | break; | |
3026 | case 4: | |
3027 | val = (XSUBR (fun)->function.a4 | |
3028 | (internal_args[0], internal_args[1], internal_args[2], | |
3029 | internal_args[3])); | |
3030 | break; | |
3031 | case 5: | |
3032 | val = (XSUBR (fun)->function.a5 | |
3033 | (internal_args[0], internal_args[1], internal_args[2], | |
3034 | internal_args[3], internal_args[4])); | |
3035 | break; | |
3036 | case 6: | |
3037 | val = (XSUBR (fun)->function.a6 | |
3038 | (internal_args[0], internal_args[1], internal_args[2], | |
3039 | internal_args[3], internal_args[4], internal_args[5])); | |
3040 | break; | |
3041 | case 7: | |
3042 | val = (XSUBR (fun)->function.a7 | |
3043 | (internal_args[0], internal_args[1], internal_args[2], | |
3044 | internal_args[3], internal_args[4], internal_args[5], | |
3045 | internal_args[6])); | |
3046 | break; | |
3047 | ||
3048 | case 8: | |
3049 | val = (XSUBR (fun)->function.a8 | |
3050 | (internal_args[0], internal_args[1], internal_args[2], | |
3051 | internal_args[3], internal_args[4], internal_args[5], | |
3052 | internal_args[6], internal_args[7])); | |
3053 | break; | |
3054 | ||
3055 | default: | |
3056 | ||
3057 | /* If a subr takes more than 8 arguments without using MANY | |
3058 | or UNEVALLED, we need to extend this function to support it. | |
3059 | Until this is done, there is no way to call the function. */ | |
3060 | abort (); | |
3061 | } | |
db9f0278 JB |
3062 | } |
3063 | } | |
ef1b0ba7 | 3064 | else if (COMPILEDP (fun)) |
db9f0278 JB |
3065 | val = funcall_lambda (fun, numargs, args + 1); |
3066 | else | |
3067 | { | |
8788120f | 3068 | if (EQ (fun, Qunbound)) |
734d55a2 | 3069 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 3070 | if (!CONSP (fun)) |
734d55a2 KS |
3071 | xsignal1 (Qinvalid_function, original_fun); |
3072 | funcar = XCAR (fun); | |
90165123 | 3073 | if (!SYMBOLP (funcar)) |
734d55a2 | 3074 | xsignal1 (Qinvalid_function, original_fun); |
defb1411 SM |
3075 | if (EQ (funcar, Qlambda) |
3076 | || EQ (funcar, Qclosure)) | |
db9f0278 | 3077 | val = funcall_lambda (fun, numargs, args + 1); |
db9f0278 JB |
3078 | else if (EQ (funcar, Qautoload)) |
3079 | { | |
8788120f | 3080 | do_autoload (fun, original_fun); |
fff3ff9c | 3081 | CHECK_CONS_LIST (); |
db9f0278 JB |
3082 | goto retry; |
3083 | } | |
3084 | else | |
734d55a2 | 3085 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 3086 | } |
c1788fbc | 3087 | CHECK_CONS_LIST (); |
db9f0278 JB |
3088 | lisp_eval_depth--; |
3089 | if (backtrace.debug_on_exit) | |
3090 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
3091 | backtrace_list = backtrace.next; | |
3092 | return val; | |
3093 | } | |
3094 | \f | |
2f7c71a1 | 3095 | static Lisp_Object |
defb1411 | 3096 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
3097 | { |
3098 | Lisp_Object args_left; | |
c5101a77 | 3099 | size_t numargs; |
db9f0278 JB |
3100 | register Lisp_Object *arg_vector; |
3101 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c5101a77 | 3102 | register size_t i; |
db9f0278 | 3103 | register Lisp_Object tem; |
3a7a9129 | 3104 | USE_SAFE_ALLOCA; |
db9f0278 | 3105 | |
c5101a77 PE |
3106 | numargs = XINT (Flength (args)); |
3107 | SAFE_ALLOCA_LISP (arg_vector, numargs); | |
db9f0278 JB |
3108 | args_left = args; |
3109 | ||
3110 | GCPRO3 (*arg_vector, args_left, fun); | |
3111 | gcpro1.nvars = 0; | |
3112 | ||
c5101a77 | 3113 | for (i = 0; i < numargs; ) |
db9f0278 JB |
3114 | { |
3115 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
defb1411 | 3116 | tem = eval_sub (tem); |
db9f0278 JB |
3117 | arg_vector[i++] = tem; |
3118 | gcpro1.nvars = i; | |
3119 | } | |
3120 | ||
3121 | UNGCPRO; | |
3122 | ||
f07a954e SM |
3123 | backtrace_list->args = arg_vector; |
3124 | backtrace_list->nargs = i; | |
db9f0278 | 3125 | backtrace_list->evalargs = 0; |
c5101a77 | 3126 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
3127 | |
3128 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3129 | if (backtrace_list->debug_on_exit) | |
3130 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3131 | /* Don't do it again when we return to eval. */ | |
3132 | backtrace_list->debug_on_exit = 0; | |
3a7a9129 | 3133 | SAFE_FREE (); |
db9f0278 JB |
3134 | return tem; |
3135 | } | |
3136 | ||
3137 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
3138 | and return the result of evaluation. | |
3139 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3140 | ||
2901f1d1 | 3141 | static Lisp_Object |
c5101a77 PE |
3142 | funcall_lambda (Lisp_Object fun, size_t nargs, |
3143 | register Lisp_Object *arg_vector) | |
db9f0278 | 3144 | { |
defb1411 | 3145 | Lisp_Object val, syms_left, next, lexenv; |
aed13378 | 3146 | int count = SPECPDL_INDEX (); |
c5101a77 PE |
3147 | size_t i; |
3148 | int optional, rest; | |
db9f0278 | 3149 | |
90165123 | 3150 | if (CONSP (fun)) |
9ab90667 | 3151 | { |
defb1411 SM |
3152 | if (EQ (XCAR (fun), Qclosure)) |
3153 | { | |
3154 | fun = XCDR (fun); /* Drop `closure'. */ | |
3155 | lexenv = XCAR (fun); | |
23aba0ea | 3156 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
3157 | } |
3158 | else | |
3159 | lexenv = Qnil; | |
9ab90667 GM |
3160 | syms_left = XCDR (fun); |
3161 | if (CONSP (syms_left)) | |
3162 | syms_left = XCAR (syms_left); | |
3163 | else | |
734d55a2 | 3164 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3165 | } |
90165123 | 3166 | else if (COMPILEDP (fun)) |
defb1411 | 3167 | { |
798cb644 SM |
3168 | syms_left = AREF (fun, COMPILED_ARGLIST); |
3169 | if (INTEGERP (syms_left)) | |
876c194c SM |
3170 | /* A byte-code object with a non-nil `push args' slot means we |
3171 | shouldn't bind any arguments, instead just call the byte-code | |
3172 | interpreter directly; it will push arguments as necessary. | |
3173 | ||
3174 | Byte-code objects with either a non-existant, or a nil value for | |
3175 | the `push args' slot (the default), have dynamically-bound | |
3176 | arguments, and use the argument-binding code below instead (as do | |
3177 | all interpreted functions, even lexically bound ones). */ | |
3178 | { | |
3179 | /* If we have not actually read the bytecode string | |
3180 | and constants vector yet, fetch them from the file. */ | |
3181 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
3182 | Ffetch_bytecode (fun); | |
3183 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
3184 | AREF (fun, COMPILED_CONSTANTS), | |
3185 | AREF (fun, COMPILED_STACK_DEPTH), | |
798cb644 | 3186 | syms_left, |
876c194c SM |
3187 | nargs, arg_vector); |
3188 | } | |
defb1411 SM |
3189 | lexenv = Qnil; |
3190 | } | |
9ab90667 GM |
3191 | else |
3192 | abort (); | |
db9f0278 | 3193 | |
9ab90667 GM |
3194 | i = optional = rest = 0; |
3195 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3196 | { |
3197 | QUIT; | |
177c0ea7 | 3198 | |
9ab90667 | 3199 | next = XCAR (syms_left); |
8788120f | 3200 | if (!SYMBOLP (next)) |
734d55a2 | 3201 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3202 | |
db9f0278 JB |
3203 | if (EQ (next, Qand_rest)) |
3204 | rest = 1; | |
3205 | else if (EQ (next, Qand_optional)) | |
3206 | optional = 1; | |
db9f0278 | 3207 | else |
db9f0278 | 3208 | { |
b9598260 | 3209 | Lisp_Object val; |
defb1411 SM |
3210 | if (rest) |
3211 | { | |
3212 | val = Flist (nargs - i, &arg_vector[i]); | |
3213 | i = nargs; | |
3214 | } | |
3215 | else if (i < nargs) | |
b9598260 SM |
3216 | val = arg_vector[i++]; |
3217 | else if (!optional) | |
3218 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3219 | else | |
3220 | val = Qnil; | |
7200d79c | 3221 | |
b9598260 | 3222 | /* Bind the argument. */ |
876c194c | 3223 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 SM |
3224 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
3225 | lexenv = Fcons (Fcons (next, val), lexenv); | |
3226 | else | |
3227 | /* Dynamically bind NEXT. */ | |
3228 | specbind (next, val); | |
db9f0278 | 3229 | } |
db9f0278 JB |
3230 | } |
3231 | ||
9ab90667 | 3232 | if (!NILP (syms_left)) |
734d55a2 | 3233 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3234 | else if (i < nargs) |
734d55a2 | 3235 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3236 | |
b9598260 SM |
3237 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3238 | /* Instantiate a new lexical environment. */ | |
3239 | specbind (Qinternal_interpreter_environment, lexenv); | |
3240 | ||
90165123 | 3241 | if (CONSP (fun)) |
9ab90667 | 3242 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3243 | else |
ca248607 RS |
3244 | { |
3245 | /* If we have not actually read the bytecode string | |
3246 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3247 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3248 | Ffetch_bytecode (fun); |
b9598260 SM |
3249 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3250 | AREF (fun, COMPILED_CONSTANTS), | |
3251 | AREF (fun, COMPILED_STACK_DEPTH), | |
3252 | Qnil, 0, 0); | |
ca248607 | 3253 | } |
177c0ea7 | 3254 | |
db9f0278 JB |
3255 | return unbind_to (count, val); |
3256 | } | |
661c7d6e KH |
3257 | |
3258 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3259 | 1, 1, 0, |
3260 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3261 | (Lisp_Object object) |
661c7d6e KH |
3262 | { |
3263 | Lisp_Object tem; | |
3264 | ||
845975f5 | 3265 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3266 | { |
845975f5 | 3267 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3268 | if (!CONSP (tem)) |
845975f5 SM |
3269 | { |
3270 | tem = AREF (object, COMPILED_BYTECODE); | |
3271 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3272 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3273 | else |
3274 | error ("Invalid byte code"); | |
3275 | } | |
3ae565b3 SM |
3276 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3277 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3278 | } |
3279 | return object; | |
3280 | } | |
db9f0278 | 3281 | \f |
475545b5 | 3282 | static void |
d3da34e0 | 3283 | grow_specpdl (void) |
db9f0278 | 3284 | { |
aed13378 | 3285 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3286 | if (specpdl_size >= max_specpdl_size) |
3287 | { | |
3288 | if (max_specpdl_size < 400) | |
3289 | max_specpdl_size = 400; | |
3290 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3291 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3292 | } |
3293 | specpdl_size *= 2; | |
3294 | if (specpdl_size > max_specpdl_size) | |
3295 | specpdl_size = max_specpdl_size; | |
3296 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3297 | specpdl_ptr = specpdl + count; | |
3298 | } | |
3299 | ||
f6d62986 | 3300 | /* `specpdl_ptr->symbol' is a field which describes which variable is |
4e2db1fe SM |
3301 | let-bound, so it can be properly undone when we unbind_to. |
3302 | It can have the following two shapes: | |
3303 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3304 | a symbol that is not buffer-local (at least at the time | |
3305 | the let binding started). Note also that it should not be | |
3306 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3307 | to record V2 here). | |
3308 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3309 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3310 | which buffer is affected (or nil if the let-binding affects the | |
3311 | global value of the variable) and BUFFER tells us which buffer was | |
3312 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3313 | BUFFER did not yet have a buffer-local value). */ | |
3314 | ||
db9f0278 | 3315 | void |
d3da34e0 | 3316 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3317 | { |
ce5b453a SM |
3318 | struct Lisp_Symbol *sym; |
3319 | ||
3320 | eassert (!handling_signal); | |
db9f0278 | 3321 | |
b7826503 | 3322 | CHECK_SYMBOL (symbol); |
ce5b453a | 3323 | sym = XSYMBOL (symbol); |
db9f0278 JB |
3324 | if (specpdl_ptr == specpdl + specpdl_size) |
3325 | grow_specpdl (); | |
719177b3 | 3326 | |
ce5b453a SM |
3327 | start: |
3328 | switch (sym->redirect) | |
719177b3 | 3329 | { |
ce5b453a SM |
3330 | case SYMBOL_VARALIAS: |
3331 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3332 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3333 | /* The most common case is that of a non-constant symbol with a |
3334 | trivial value. Make that as fast as we can. */ | |
3335 | specpdl_ptr->symbol = symbol; | |
3336 | specpdl_ptr->old_value = SYMBOL_VAL (sym); | |
3337 | specpdl_ptr->func = NULL; | |
3338 | ++specpdl_ptr; | |
3339 | if (!sym->constant) | |
3340 | SET_SYMBOL_VAL (sym, value); | |
3341 | else | |
3342 | set_internal (symbol, value, Qnil, 1); | |
3343 | break; | |
4e2db1fe SM |
3344 | case SYMBOL_LOCALIZED: |
3345 | if (SYMBOL_BLV (sym)->frame_local) | |
3346 | error ("Frame-local vars cannot be let-bound"); | |
3347 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3348 | { |
3349 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3350 | specpdl_ptr->func = 0; | |
3351 | specpdl_ptr->old_value = ovalue; | |
3352 | ||
3353 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3354 | || (EQ (SYMBOL_BLV (sym)->where, | |
3355 | SYMBOL_BLV (sym)->frame_local ? | |
3356 | Fselected_frame () : Fcurrent_buffer ()))); | |
3357 | ||
3358 | if (sym->redirect == SYMBOL_LOCALIZED | |
3359 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3360 | { | |
3361 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3362 | ||
3363 | /* For a local variable, record both the symbol and which | |
3364 | buffer's or frame's value we are saving. */ | |
3365 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3366 | { | |
3367 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3368 | || (BLV_FOUND (SYMBOL_BLV (sym)) | |
3369 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); | |
3370 | where = cur_buf; | |
3371 | } | |
3372 | else if (sym->redirect == SYMBOL_LOCALIZED | |
3373 | && BLV_FOUND (SYMBOL_BLV (sym))) | |
3374 | where = SYMBOL_BLV (sym)->where; | |
3375 | else | |
3376 | where = Qnil; | |
3377 | ||
3378 | /* We're not using the `unused' slot in the specbinding | |
3379 | structure because this would mean we have to do more | |
3380 | work for simple variables. */ | |
3381 | /* FIXME: The third value `current_buffer' is only used in | |
3382 | let_shadows_buffer_binding_p which is itself only used | |
3383 | in set_internal for local_if_set. */ | |
4e2db1fe | 3384 | eassert (NILP (where) || EQ (where, cur_buf)); |
ce5b453a SM |
3385 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, cur_buf)); |
3386 | ||
3387 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3388 | buffer-local value here, make the `let' change the global | |
3389 | value by changing the value of SYMBOL in all buffers not | |
3390 | having their own value. This is consistent with what | |
3391 | happens with other buffer-local variables. */ | |
3392 | if (NILP (where) | |
3393 | && sym->redirect == SYMBOL_FORWARDED) | |
3394 | { | |
3395 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3396 | ++specpdl_ptr; | |
3397 | Fset_default (symbol, value); | |
3398 | return; | |
3399 | } | |
3400 | } | |
3401 | else | |
3402 | specpdl_ptr->symbol = symbol; | |
3403 | ||
3404 | specpdl_ptr++; | |
94b612ad | 3405 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3406 | break; |
3407 | } | |
3408 | default: abort (); | |
9ab90667 | 3409 | } |
db9f0278 JB |
3410 | } |
3411 | ||
3412 | void | |
d3da34e0 | 3413 | record_unwind_protect (Lisp_Object (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3414 | { |
9ba8e10d CY |
3415 | eassert (!handling_signal); |
3416 | ||
db9f0278 JB |
3417 | if (specpdl_ptr == specpdl + specpdl_size) |
3418 | grow_specpdl (); | |
3419 | specpdl_ptr->func = function; | |
3420 | specpdl_ptr->symbol = Qnil; | |
3421 | specpdl_ptr->old_value = arg; | |
3422 | specpdl_ptr++; | |
3423 | } | |
3424 | ||
3425 | Lisp_Object | |
d3da34e0 | 3426 | unbind_to (int count, Lisp_Object value) |
db9f0278 | 3427 | { |
5a073f50 KS |
3428 | Lisp_Object quitf = Vquit_flag; |
3429 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3430 | |
5a073f50 | 3431 | GCPRO2 (value, quitf); |
db9f0278 JB |
3432 | Vquit_flag = Qnil; |
3433 | ||
3434 | while (specpdl_ptr != specpdl + count) | |
3435 | { | |
611a8f8c RS |
3436 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3437 | the work to unbind it. We decrement first | |
3438 | so that an error in unbinding won't try to unbind | |
3439 | the same entry again, and we copy the binding first | |
3440 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3441 | |
45f266dc DL |
3442 | struct specbinding this_binding; |
3443 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3444 | |
3445 | if (this_binding.func != 0) | |
3446 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3447 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3448 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3449 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3450 | bound a variable that had a buffer-local or frame-local |
3451 | binding. WHERE nil means that the variable had the default | |
0967b4b0 | 3452 | value when it was bound. CURRENT-BUFFER is the buffer that |
bb8e180f | 3453 | was current when the variable was bound. */ |
611a8f8c | 3454 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3455 | { |
eb700b82 | 3456 | Lisp_Object symbol, where; |
719177b3 | 3457 | |
611a8f8c RS |
3458 | symbol = XCAR (this_binding.symbol); |
3459 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3460 | |
eb700b82 | 3461 | if (NILP (where)) |
611a8f8c | 3462 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3463 | /* If `where' is non-nil, reset the value in the appropriate |
3464 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3465 | else if (BUFFERP (where) |
3466 | ? !NILP (Flocal_variable_p (symbol, where)) | |
3467 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) | |
3468 | set_internal (symbol, this_binding.old_value, where, 1); | |
719177b3 | 3469 | } |
94b612ad SM |
3470 | /* If variable has a trivial value (no forwarding), we can |
3471 | just set it. No need to check for constant symbols here, | |
3472 | since that was already done by specbind. */ | |
3473 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3474 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3475 | this_binding.old_value); | |
db9f0278 | 3476 | else |
94b612ad SM |
3477 | /* NOTE: we only ever come here if make_local_foo was used for |
3478 | the first time on this var within this let. */ | |
3479 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3480 | } |
177c0ea7 | 3481 | |
5a073f50 KS |
3482 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3483 | Vquit_flag = quitf; | |
db9f0278 JB |
3484 | |
3485 | UNGCPRO; | |
db9f0278 JB |
3486 | return value; |
3487 | } | |
b9598260 | 3488 | |
4a330052 | 3489 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3490 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3491 | A special variable is one that will be bound dynamically, even in a | |
3492 | context where binding is lexical by default. */) | |
c566235d | 3493 | (Lisp_Object symbol) |
b9598260 SM |
3494 | { |
3495 | CHECK_SYMBOL (symbol); | |
3496 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3497 | } | |
3498 | ||
db9f0278 | 3499 | \f |
db9f0278 | 3500 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3501 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3502 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3503 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 JB |
3504 | { |
3505 | register struct backtrace *backlist = backtrace_list; | |
3506 | register int i; | |
3507 | ||
b7826503 | 3508 | CHECK_NUMBER (level); |
db9f0278 JB |
3509 | |
3510 | for (i = 0; backlist && i < XINT (level); i++) | |
3511 | { | |
3512 | backlist = backlist->next; | |
3513 | } | |
3514 | ||
3515 | if (backlist) | |
265a9e55 | 3516 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3517 | |
3518 | return flag; | |
3519 | } | |
3520 | ||
3521 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3522 | doc: /* Print a trace of Lisp function calls currently active. |
3523 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3524 | (void) |
db9f0278 JB |
3525 | { |
3526 | register struct backtrace *backlist = backtrace_list; | |
db9f0278 JB |
3527 | Lisp_Object tail; |
3528 | Lisp_Object tem; | |
db9f0278 | 3529 | struct gcpro gcpro1; |
d4b6d95d | 3530 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3531 | |
d4b6d95d LMI |
3532 | if (NILP (Vprint_level)) |
3533 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 JB |
3534 | |
3535 | tail = Qnil; | |
3536 | GCPRO1 (tail); | |
3537 | ||
3538 | while (backlist) | |
3539 | { | |
3540 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
44f230aa | 3541 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3542 | { |
3543 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3544 | write_string ("\n", -1); |
db9f0278 JB |
3545 | } |
3546 | else | |
3547 | { | |
3548 | tem = *backlist->function; | |
f6d62986 | 3549 | Fprin1 (tem, Qnil); /* This can QUIT. */ |
db9f0278 | 3550 | write_string ("(", -1); |
44f230aa SM |
3551 | if (backlist->nargs == MANY) |
3552 | { /* FIXME: Can this happen? */ | |
a3eed478 | 3553 | int i; |
db9f0278 | 3554 | for (tail = *backlist->args, i = 0; |
265a9e55 | 3555 | !NILP (tail); |
a3eed478 | 3556 | tail = Fcdr (tail), i = 1) |
db9f0278 JB |
3557 | { |
3558 | if (i) write_string (" ", -1); | |
3559 | Fprin1 (Fcar (tail), Qnil); | |
3560 | } | |
3561 | } | |
3562 | else | |
3563 | { | |
a3eed478 | 3564 | size_t i; |
db9f0278 JB |
3565 | for (i = 0; i < backlist->nargs; i++) |
3566 | { | |
3567 | if (i) write_string (" ", -1); | |
3568 | Fprin1 (backlist->args[i], Qnil); | |
3569 | } | |
3570 | } | |
b6703b02 | 3571 | write_string (")\n", -1); |
db9f0278 | 3572 | } |
db9f0278 JB |
3573 | backlist = backlist->next; |
3574 | } | |
3575 | ||
d4b6d95d | 3576 | Vprint_level = old_print_level; |
db9f0278 JB |
3577 | UNGCPRO; |
3578 | return Qnil; | |
3579 | } | |
3580 | ||
17401c97 | 3581 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3582 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3583 | If that frame has not evaluated the arguments yet (or is a special form), | |
3584 | the value is (nil FUNCTION ARG-FORMS...). | |
3585 | If that frame has evaluated its arguments and called its function already, | |
3586 | the value is (t FUNCTION ARG-VALUES...). | |
3587 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3588 | FUNCTION is whatever was supplied as car of evaluated list, | |
3589 | or a lambda expression for macro calls. | |
3590 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3591 | (Lisp_Object nframes) |
db9f0278 JB |
3592 | { |
3593 | register struct backtrace *backlist = backtrace_list; | |
5d5d959d | 3594 | register EMACS_INT i; |
db9f0278 JB |
3595 | Lisp_Object tem; |
3596 | ||
b7826503 | 3597 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3598 | |
3599 | /* Find the frame requested. */ | |
b6703b02 | 3600 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3601 | backlist = backlist->next; |
3602 | ||
3603 | if (!backlist) | |
3604 | return Qnil; | |
44f230aa | 3605 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3606 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); |
3607 | else | |
3608 | { | |
44f230aa | 3609 | if (backlist->nargs == MANY) /* FIXME: Can this happen? */ |
db9f0278 JB |
3610 | tem = *backlist->args; |
3611 | else | |
3612 | tem = Flist (backlist->nargs, backlist->args); | |
3613 | ||
3614 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3615 | } | |
3616 | } | |
a2ff3819 | 3617 | |
db9f0278 | 3618 | \f |
4ce0541e | 3619 | void |
d3da34e0 | 3620 | mark_backtrace (void) |
4ce0541e SM |
3621 | { |
3622 | register struct backtrace *backlist; | |
c5101a77 | 3623 | register size_t i; |
4ce0541e SM |
3624 | |
3625 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3626 | { | |
3627 | mark_object (*backlist->function); | |
3628 | ||
44f230aa SM |
3629 | if (backlist->nargs == UNEVALLED |
3630 | || backlist->nargs == MANY) /* FIXME: Can this happen? */ | |
c5101a77 | 3631 | i = 1; |
4ce0541e | 3632 | else |
c5101a77 PE |
3633 | i = backlist->nargs; |
3634 | while (i--) | |
4ce0541e SM |
3635 | mark_object (backlist->args[i]); |
3636 | } | |
3637 | } | |
3638 | ||
b38b1ec0 SM |
3639 | EXFUN (Funintern, 2); |
3640 | ||
dfcf069d | 3641 | void |
d3da34e0 | 3642 | syms_of_eval (void) |
db9f0278 | 3643 | { |
29208e82 | 3644 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
82fc29a1 | 3645 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3646 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3647 | an error is signaled. |
3648 | You can safely use a value considerably larger than the default value, | |
3649 | if that proves inconveniently small. However, if you increase it too far, | |
3650 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3651 | |
29208e82 | 3652 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
9dbc9081 | 3653 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3654 | |
3655 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3656 | actual stack overflow in C, which would be fatal for Emacs. |
3657 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3658 | if that proves inconveniently small. However, if you increase it too far, |
3659 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3660 | |
29208e82 | 3661 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3662 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3663 | If the value is t, that means do an ordinary quit. |
3664 | If the value equals `throw-on-input', that means quit by throwing | |
3665 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3666 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3667 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3668 | Vquit_flag = Qnil; |
3669 | ||
29208e82 | 3670 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3671 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3672 | Note that `quit-flag' will still be set by typing C-g, | |
3673 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3674 | To prevent this happening, set `quit-flag' to nil | |
3675 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3676 | Vinhibit_quit = Qnil; |
3677 | ||
d67b4f80 | 3678 | Qinhibit_quit = intern_c_string ("inhibit-quit"); |
ad236261 JB |
3679 | staticpro (&Qinhibit_quit); |
3680 | ||
d67b4f80 | 3681 | Qautoload = intern_c_string ("autoload"); |
db9f0278 JB |
3682 | staticpro (&Qautoload); |
3683 | ||
d67b4f80 | 3684 | Qdebug_on_error = intern_c_string ("debug-on-error"); |
db9f0278 JB |
3685 | staticpro (&Qdebug_on_error); |
3686 | ||
d67b4f80 | 3687 | Qmacro = intern_c_string ("macro"); |
db9f0278 JB |
3688 | staticpro (&Qmacro); |
3689 | ||
d67b4f80 | 3690 | Qdeclare = intern_c_string ("declare"); |
d6edd563 | 3691 | staticpro (&Qdeclare); |
177c0ea7 | 3692 | |
db9f0278 JB |
3693 | /* Note that the process handling also uses Qexit, but we don't want |
3694 | to staticpro it twice, so we just do it here. */ | |
d67b4f80 | 3695 | Qexit = intern_c_string ("exit"); |
db9f0278 JB |
3696 | staticpro (&Qexit); |
3697 | ||
d67b4f80 | 3698 | Qinteractive = intern_c_string ("interactive"); |
db9f0278 JB |
3699 | staticpro (&Qinteractive); |
3700 | ||
d67b4f80 | 3701 | Qcommandp = intern_c_string ("commandp"); |
db9f0278 JB |
3702 | staticpro (&Qcommandp); |
3703 | ||
d67b4f80 | 3704 | Qdefun = intern_c_string ("defun"); |
db9f0278 JB |
3705 | staticpro (&Qdefun); |
3706 | ||
d67b4f80 | 3707 | Qand_rest = intern_c_string ("&rest"); |
db9f0278 JB |
3708 | staticpro (&Qand_rest); |
3709 | ||
d67b4f80 | 3710 | Qand_optional = intern_c_string ("&optional"); |
db9f0278 JB |
3711 | staticpro (&Qand_optional); |
3712 | ||
b9598260 SM |
3713 | Qclosure = intern_c_string ("closure"); |
3714 | staticpro (&Qclosure); | |
3715 | ||
d67b4f80 | 3716 | Qdebug = intern_c_string ("debug"); |
f01cbfdd RS |
3717 | staticpro (&Qdebug); |
3718 | ||
29208e82 | 3719 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
9dbc9081 PJ |
3720 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3721 | Does not apply to errors handled by `condition-case' or those | |
3722 | matched by `debug-ignored-errors'. | |
3723 | If the value is a list, an error only means to enter the debugger | |
3724 | if one of its condition symbols appears in the list. | |
3725 | When you evaluate an expression interactively, this variable | |
3726 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f CY |
3727 | The command `toggle-debug-on-error' toggles this. |
3728 | See also the variable `debug-on-quit'. */); | |
128c0f66 | 3729 | Vdebug_on_error = Qnil; |
db9f0278 | 3730 | |
29208e82 | 3731 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
9dbc9081 PJ |
3732 | doc: /* *List of errors for which the debugger should not be called. |
3733 | Each element may be a condition-name or a regexp that matches error messages. | |
3734 | If any element applies to a given error, that error skips the debugger | |
3735 | and just returns to top level. | |
3736 | This overrides the variable `debug-on-error'. | |
3737 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3738 | Vdebug_ignored_errors = Qnil; |
3739 | ||
29208e82 | 3740 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
82fc29a1 JB |
3741 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3742 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3743 | debug_on_quit = 0; |
3744 | ||
29208e82 | 3745 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3746 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3747 | |
29208e82 | 3748 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3749 | doc: /* Non-nil means debugger may continue execution. |
3750 | This is nil when the debugger is called under circumstances where it | |
3751 | might not be safe to continue. */); | |
dac204bc | 3752 | debugger_may_continue = 1; |
556d7314 | 3753 | |
29208e82 | 3754 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3755 | doc: /* Function to call to invoke debugger. |
3756 | If due to frame exit, args are `exit' and the value being returned; | |
3757 | this function's value will be returned instead of that. | |
3758 | If due to error, args are `error' and a list of the args to `signal'. | |
3759 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3760 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3761 | Vdebugger = Qnil; |
3762 | ||
29208e82 | 3763 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3764 | doc: /* If non-nil, this is a function for `signal' to call. |
3765 | It receives the same arguments that `signal' was given. | |
3766 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3767 | Vsignal_hook_function = Qnil; |
3768 | ||
29208e82 | 3769 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
9dbc9081 PJ |
3770 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3771 | Note that `debug-on-error', `debug-on-quit' and friends | |
3772 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3773 | Vdebug_on_signal = Qnil; |
61ede770 | 3774 | |
29208e82 | 3775 | DEFVAR_LISP ("macro-declaration-function", Vmacro_declaration_function, |
d6edd563 GM |
3776 | doc: /* Function to process declarations in a macro definition. |
3777 | The function will be called with two args MACRO and DECL. | |
3778 | MACRO is the name of the macro being defined. | |
3779 | DECL is a list `(declare ...)' containing the declarations. | |
3780 | The value the function returns is not used. */); | |
3781 | Vmacro_declaration_function = Qnil; | |
3782 | ||
b38b1ec0 SM |
3783 | /* When lexical binding is being used, |
3784 | vinternal_interpreter_environment is non-nil, and contains an alist | |
3785 | of lexically-bound variable, or (t), indicating an empty | |
3786 | environment. The lisp name of this variable would be | |
3787 | `internal-interpreter-environment' if it weren't hidden. | |
3788 | Every element of this list can be either a cons (VAR . VAL) | |
3789 | specifying a lexical binding, or a single symbol VAR indicating | |
3790 | that this variable should use dynamic scoping. */ | |
b9598260 SM |
3791 | Qinternal_interpreter_environment |
3792 | = intern_c_string ("internal-interpreter-environment"); | |
3793 | staticpro (&Qinternal_interpreter_environment); | |
b38b1ec0 SM |
3794 | DEFVAR_LISP ("internal-interpreter-environment", |
3795 | Vinternal_interpreter_environment, | |
b9598260 SM |
3796 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
3797 | When lexical binding is not being used, this variable is nil. | |
3798 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3799 | alist of active lexical bindings. */); | |
3800 | Vinternal_interpreter_environment = Qnil; | |
b38b1ec0 SM |
3801 | /* Don't export this variable to Elisp, so noone can mess with it |
3802 | (Just imagine if someone makes it buffer-local). */ | |
3803 | Funintern (Qinternal_interpreter_environment, Qnil); | |
b9598260 | 3804 | |
d67b4f80 | 3805 | Vrun_hooks = intern_c_string ("run-hooks"); |
6e6e9f08 | 3806 | staticpro (&Vrun_hooks); |
db9f0278 JB |
3807 | |
3808 | staticpro (&Vautoload_queue); | |
3809 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3810 | staticpro (&Vsignaling_function); |
3811 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3812 | |
3813 | defsubr (&Sor); | |
3814 | defsubr (&Sand); | |
3815 | defsubr (&Sif); | |
3816 | defsubr (&Scond); | |
3817 | defsubr (&Sprogn); | |
3818 | defsubr (&Sprog1); | |
3819 | defsubr (&Sprog2); | |
3820 | defsubr (&Ssetq); | |
3821 | defsubr (&Squote); | |
3822 | defsubr (&Sfunction); | |
3823 | defsubr (&Sdefun); | |
3824 | defsubr (&Sdefmacro); | |
3825 | defsubr (&Sdefvar); | |
19cebf5a | 3826 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3827 | defsubr (&Sdefconst); |
3828 | defsubr (&Suser_variable_p); | |
3829 | defsubr (&Slet); | |
3830 | defsubr (&SletX); | |
3831 | defsubr (&Swhile); | |
3832 | defsubr (&Smacroexpand); | |
3833 | defsubr (&Scatch); | |
3834 | defsubr (&Sthrow); | |
3835 | defsubr (&Sunwind_protect); | |
3836 | defsubr (&Scondition_case); | |
3837 | defsubr (&Ssignal); | |
3838 | defsubr (&Sinteractive_p); | |
4b664e76 | 3839 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
3840 | defsubr (&Scommandp); |
3841 | defsubr (&Sautoload); | |
3842 | defsubr (&Seval); | |
3843 | defsubr (&Sapply); | |
3844 | defsubr (&Sfuncall); | |
ff936e53 SM |
3845 | defsubr (&Srun_hooks); |
3846 | defsubr (&Srun_hook_with_args); | |
3847 | defsubr (&Srun_hook_with_args_until_success); | |
3848 | defsubr (&Srun_hook_with_args_until_failure); | |
f6d62986 | 3849 | defsubr (&Srun_hook_wrapped); |
661c7d6e | 3850 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3851 | defsubr (&Sbacktrace_debug); |
3852 | defsubr (&Sbacktrace); | |
3853 | defsubr (&Sbacktrace_frame); | |
4a330052 | 3854 | defsubr (&Sspecial_variable_p); |
b9598260 | 3855 | defsubr (&Sfunctionp); |
db9f0278 | 3856 | } |