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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> |
eb3f1cc8 | 21 | #include <limits.h> |
d7306fe6 | 22 | #include <setjmp.h> |
4e2fe2e6 | 23 | #include <stdio.h> |
db9f0278 | 24 | #include "lisp.h" |
9ac0d9e0 | 25 | #include "blockinput.h" |
db9f0278 | 26 | #include "commands.h" |
1f98fa48 | 27 | #include "keyboard.h" |
3648c842 | 28 | #include "dispextern.h" |
94b612ad | 29 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 30 | |
b70e1a2b SM |
31 | #if HAVE_X_WINDOWS |
32 | #include "xterm.h" | |
33 | #endif | |
34 | ||
db9f0278 | 35 | struct backtrace |
4c576a83 GM |
36 | { |
37 | struct backtrace *next; | |
38 | Lisp_Object *function; | |
f6d62986 | 39 | Lisp_Object *args; /* Points to vector of args. */ |
bbc6b304 | 40 | ptrdiff_t nargs; /* Length of vector. */ |
f6d62986 | 41 | /* Nonzero means call value of debugger when done with this operation. */ |
bbc6b304 | 42 | unsigned int debug_on_exit : 1; |
4c576a83 | 43 | }; |
db9f0278 | 44 | |
57a96f5c | 45 | static struct backtrace *backtrace_list; |
244ed907 PE |
46 | |
47 | #if !BYTE_MARK_STACK | |
48 | static | |
49 | #endif | |
db9f0278 JB |
50 | struct catchtag *catchlist; |
51 | ||
244ed907 PE |
52 | /* Chain of condition handlers currently in effect. |
53 | The elements of this chain are contained in the stack frames | |
54 | of Fcondition_case and internal_condition_case. | |
55 | When an error is signaled (by calling Fsignal, below), | |
56 | this chain is searched for an element that applies. */ | |
57 | ||
58 | #if !BYTE_MARK_STACK | |
59 | static | |
60 | #endif | |
61 | struct handler *handlerlist; | |
62 | ||
15934ffa RS |
63 | #ifdef DEBUG_GCPRO |
64 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
65 | int gcpro_level; | |
66 | #endif | |
67 | ||
6fd797f5 | 68 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
29208e82 | 69 | Lisp_Object Qinhibit_quit; |
955cbe7b PE |
70 | Lisp_Object Qand_rest; |
71 | static Lisp_Object Qand_optional; | |
72 | static Lisp_Object Qdebug_on_error; | |
73 | static Lisp_Object Qdeclare; | |
b9598260 SM |
74 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
75 | ||
ed008a6d | 76 | static Lisp_Object Qdebug; |
db9f0278 | 77 | |
6e6e9f08 RS |
78 | /* This holds either the symbol `run-hooks' or nil. |
79 | It is nil at an early stage of startup, and when Emacs | |
80 | is shutting down. */ | |
4c576a83 | 81 | |
db9f0278 JB |
82 | Lisp_Object Vrun_hooks; |
83 | ||
84 | /* Non-nil means record all fset's and provide's, to be undone | |
85 | if the file being autoloaded is not fully loaded. | |
86 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 87 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
88 | |
89 | Lisp_Object Vautoload_queue; | |
90 | ||
91 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 92 | |
5816888b | 93 | EMACS_INT specpdl_size; |
db9f0278 JB |
94 | |
95 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 96 | |
db9f0278 JB |
97 | struct specbinding *specpdl; |
98 | ||
99 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 100 | |
ab837828 | 101 | struct specbinding *specpdl_ptr; |
db9f0278 | 102 | |
db9f0278 | 103 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 104 | |
57a96f5c | 105 | static EMACS_INT lisp_eval_depth; |
db9f0278 | 106 | |
be857679 | 107 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 108 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 109 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
110 | know that the debugger itself has an error, and we should just |
111 | signal the error instead of entering an infinite loop of debugger | |
112 | invocations. */ | |
4c576a83 | 113 | |
57a96f5c | 114 | static int when_entered_debugger; |
db9f0278 | 115 | |
a2ff3819 GM |
116 | /* The function from which the last `signal' was called. Set in |
117 | Fsignal. */ | |
118 | ||
119 | Lisp_Object Vsignaling_function; | |
120 | ||
4c576a83 GM |
121 | /* Set to non-zero while processing X events. Checked in Feval to |
122 | make sure the Lisp interpreter isn't called from a signal handler, | |
123 | which is unsafe because the interpreter isn't reentrant. */ | |
124 | ||
125 | int handling_signal; | |
126 | ||
f66c7cf8 | 127 | static Lisp_Object funcall_lambda (Lisp_Object, ptrdiff_t, Lisp_Object *); |
f57e2426 | 128 | static void unwind_to_catch (struct catchtag *, Lisp_Object) NO_RETURN; |
2f7c71a1 | 129 | static int interactive_p (int); |
7200d79c | 130 | static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args); |
cd64ea1d | 131 | static Lisp_Object Ffetch_bytecode (Lisp_Object); |
873759d5 | 132 | \f |
dfcf069d | 133 | void |
d3da34e0 | 134 | init_eval_once (void) |
db9f0278 JB |
135 | { |
136 | specpdl_size = 50; | |
716acfce | 137 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 138 | specpdl_ptr = specpdl; |
6588243d | 139 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
c530e1c2 | 140 | max_specpdl_size = 1300; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 141 | max_lisp_eval_depth = 600; |
34d470ba RS |
142 | |
143 | Vrun_hooks = Qnil; | |
db9f0278 JB |
144 | } |
145 | ||
dfcf069d | 146 | void |
d3da34e0 | 147 | init_eval (void) |
db9f0278 JB |
148 | { |
149 | specpdl_ptr = specpdl; | |
150 | catchlist = 0; | |
151 | handlerlist = 0; | |
152 | backtrace_list = 0; | |
153 | Vquit_flag = Qnil; | |
154 | debug_on_next_call = 0; | |
155 | lisp_eval_depth = 0; | |
87e21fbd | 156 | #ifdef DEBUG_GCPRO |
15934ffa | 157 | gcpro_level = 0; |
87e21fbd | 158 | #endif |
be857679 | 159 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 160 | when_entered_debugger = -1; |
db9f0278 JB |
161 | } |
162 | ||
f6d62986 | 163 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb RS |
164 | |
165 | static Lisp_Object | |
d3da34e0 | 166 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
167 | { |
168 | max_specpdl_size = XINT (XCAR (data)); | |
169 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 170 | return Qnil; |
9f5903bb RS |
171 | } |
172 | ||
173 | /* Call the Lisp debugger, giving it argument ARG. */ | |
174 | ||
475545b5 | 175 | static Lisp_Object |
d3da34e0 | 176 | call_debugger (Lisp_Object arg) |
db9f0278 | 177 | { |
3648c842 | 178 | int debug_while_redisplaying; |
aed13378 | 179 | int count = SPECPDL_INDEX (); |
3648c842 | 180 | Lisp_Object val; |
5816888b | 181 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 182 | |
9f5903bb RS |
183 | /* Temporarily bump up the stack limits, |
184 | so the debugger won't run out of stack. */ | |
177c0ea7 | 185 | |
9f5903bb RS |
186 | max_specpdl_size += 1; |
187 | record_unwind_protect (restore_stack_limits, | |
188 | Fcons (make_number (old_max), | |
189 | make_number (max_lisp_eval_depth))); | |
190 | max_specpdl_size = old_max; | |
191 | ||
192 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
193 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
194 | ||
195 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
196 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 197 | |
d148e14d | 198 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
199 | if (display_hourglass_p) |
200 | cancel_hourglass (); | |
237c23b0 GM |
201 | #endif |
202 | ||
db9f0278 | 203 | debug_on_next_call = 0; |
be857679 | 204 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
205 | |
206 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
207 | displayed if the debugger is invoked during redisplay. */ | |
208 | debug_while_redisplaying = redisplaying_p; | |
209 | redisplaying_p = 0; | |
556d7314 GM |
210 | specbind (intern ("debugger-may-continue"), |
211 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 212 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 213 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
214 | |
215 | #if 0 /* Binding this prevents execution of Lisp code during | |
216 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 217 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 218 | #endif |
177c0ea7 | 219 | |
3648c842 GM |
220 | val = apply1 (Vdebugger, arg); |
221 | ||
222 | /* Interrupting redisplay and resuming it later is not safe under | |
223 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 224 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
225 | if (debug_while_redisplaying) |
226 | Ftop_level (); | |
227 | ||
556d7314 | 228 | return unbind_to (count, val); |
db9f0278 JB |
229 | } |
230 | ||
475545b5 | 231 | static void |
d3da34e0 | 232 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
233 | { |
234 | debug_on_next_call = 0; | |
235 | backtrace_list->debug_on_exit = 1; | |
236 | call_debugger (Fcons (code, Qnil)); | |
237 | } | |
238 | \f | |
239 | /* NOTE!!! Every function that can call EVAL must protect its args | |
240 | and temporaries from garbage collection while it needs them. | |
241 | The definition of `For' shows what you have to do. */ | |
242 | ||
243 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
244 | doc: /* Eval args until one of them yields non-nil, then return that value. |
245 | The remaining args are not evalled at all. | |
246 | If all args return nil, return nil. | |
533eb34b | 247 | usage: (or CONDITIONS...) */) |
5842a27b | 248 | (Lisp_Object args) |
db9f0278 | 249 | { |
e509f168 | 250 | register Lisp_Object val = Qnil; |
db9f0278 JB |
251 | struct gcpro gcpro1; |
252 | ||
e509f168 | 253 | GCPRO1 (args); |
db9f0278 | 254 | |
e509f168 | 255 | while (CONSP (args)) |
db9f0278 | 256 | { |
defb1411 | 257 | val = eval_sub (XCAR (args)); |
265a9e55 | 258 | if (!NILP (val)) |
db9f0278 | 259 | break; |
e509f168 | 260 | args = XCDR (args); |
db9f0278 | 261 | } |
db9f0278 JB |
262 | |
263 | UNGCPRO; | |
264 | return val; | |
265 | } | |
266 | ||
267 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 268 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
269 | The remaining args are not evalled at all. |
270 | If no arg yields nil, return the last arg's value. | |
533eb34b | 271 | usage: (and CONDITIONS...) */) |
5842a27b | 272 | (Lisp_Object args) |
db9f0278 | 273 | { |
e509f168 | 274 | register Lisp_Object val = Qt; |
db9f0278 JB |
275 | struct gcpro gcpro1; |
276 | ||
e509f168 | 277 | GCPRO1 (args); |
db9f0278 | 278 | |
e509f168 | 279 | while (CONSP (args)) |
db9f0278 | 280 | { |
defb1411 | 281 | val = eval_sub (XCAR (args)); |
265a9e55 | 282 | if (NILP (val)) |
db9f0278 | 283 | break; |
e509f168 | 284 | args = XCDR (args); |
db9f0278 | 285 | } |
db9f0278 JB |
286 | |
287 | UNGCPRO; | |
288 | return val; | |
289 | } | |
290 | ||
291 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 292 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
293 | Returns the value of THEN or the value of the last of the ELSE's. |
294 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
295 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 296 | usage: (if COND THEN ELSE...) */) |
5842a27b | 297 | (Lisp_Object args) |
db9f0278 JB |
298 | { |
299 | register Lisp_Object cond; | |
300 | struct gcpro gcpro1; | |
301 | ||
302 | GCPRO1 (args); | |
defb1411 | 303 | cond = eval_sub (Fcar (args)); |
db9f0278 JB |
304 | UNGCPRO; |
305 | ||
265a9e55 | 306 | if (!NILP (cond)) |
defb1411 | 307 | return eval_sub (Fcar (Fcdr (args))); |
db9f0278 JB |
308 | return Fprogn (Fcdr (Fcdr (args))); |
309 | } | |
310 | ||
311 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
312 | doc: /* Try each clause until one succeeds. |
313 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
314 | and, if the value is non-nil, this clause succeeds: | |
315 | then the expressions in BODY are evaluated and the last one's | |
316 | value is the value of the cond-form. | |
317 | If no clause succeeds, cond returns nil. | |
318 | If a clause has one element, as in (CONDITION), | |
319 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 320 | usage: (cond CLAUSES...) */) |
5842a27b | 321 | (Lisp_Object args) |
db9f0278 JB |
322 | { |
323 | register Lisp_Object clause, val; | |
324 | struct gcpro gcpro1; | |
325 | ||
326 | val = Qnil; | |
327 | GCPRO1 (args); | |
265a9e55 | 328 | while (!NILP (args)) |
db9f0278 JB |
329 | { |
330 | clause = Fcar (args); | |
defb1411 | 331 | val = eval_sub (Fcar (clause)); |
265a9e55 | 332 | if (!NILP (val)) |
db9f0278 | 333 | { |
03699b14 KR |
334 | if (!EQ (XCDR (clause), Qnil)) |
335 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
336 | break; |
337 | } | |
03699b14 | 338 | args = XCDR (args); |
db9f0278 JB |
339 | } |
340 | UNGCPRO; | |
341 | ||
342 | return val; | |
343 | } | |
344 | ||
a7ca3326 | 345 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, |
9dbc9081 | 346 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 347 | usage: (progn BODY...) */) |
5842a27b | 348 | (Lisp_Object args) |
db9f0278 | 349 | { |
e509f168 | 350 | register Lisp_Object val = Qnil; |
db9f0278 JB |
351 | struct gcpro gcpro1; |
352 | ||
e509f168 | 353 | GCPRO1 (args); |
db9f0278 | 354 | |
e509f168 | 355 | while (CONSP (args)) |
db9f0278 | 356 | { |
defb1411 | 357 | val = eval_sub (XCAR (args)); |
e509f168 | 358 | args = XCDR (args); |
db9f0278 | 359 | } |
db9f0278 JB |
360 | |
361 | UNGCPRO; | |
362 | return val; | |
363 | } | |
364 | ||
365 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 366 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
367 | The value of FIRST is saved during the evaluation of the remaining args, |
368 | whose values are discarded. | |
7a25dc6d | 369 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 370 | (Lisp_Object args) |
db9f0278 JB |
371 | { |
372 | Lisp_Object val; | |
373 | register Lisp_Object args_left; | |
374 | struct gcpro gcpro1, gcpro2; | |
375 | register int argnum = 0; | |
376 | ||
9ac66b45 | 377 | if (NILP (args)) |
db9f0278 JB |
378 | return Qnil; |
379 | ||
380 | args_left = args; | |
381 | val = Qnil; | |
382 | GCPRO2 (args, val); | |
383 | ||
384 | do | |
385 | { | |
ba83908c | 386 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 387 | if (!(argnum++)) |
ba83908c SM |
388 | val = tem; |
389 | args_left = XCDR (args_left); | |
db9f0278 | 390 | } |
ba83908c | 391 | while (CONSP (args_left)); |
db9f0278 JB |
392 | |
393 | UNGCPRO; | |
394 | return val; | |
395 | } | |
396 | ||
397 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 398 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
399 | The value of FORM2 is saved during the evaluation of the |
400 | remaining args, whose values are discarded. | |
401 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 402 | (Lisp_Object args) |
db9f0278 JB |
403 | { |
404 | Lisp_Object val; | |
405 | register Lisp_Object args_left; | |
406 | struct gcpro gcpro1, gcpro2; | |
407 | register int argnum = -1; | |
408 | ||
409 | val = Qnil; | |
410 | ||
87d238ba | 411 | if (NILP (args)) |
db9f0278 JB |
412 | return Qnil; |
413 | ||
414 | args_left = args; | |
415 | val = Qnil; | |
416 | GCPRO2 (args, val); | |
417 | ||
418 | do | |
419 | { | |
ba83908c | 420 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 421 | if (!(argnum++)) |
ba83908c SM |
422 | val = tem; |
423 | args_left = XCDR (args_left); | |
db9f0278 | 424 | } |
ba83908c | 425 | while (CONSP (args_left)); |
db9f0278 JB |
426 | |
427 | UNGCPRO; | |
428 | return val; | |
429 | } | |
430 | ||
431 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
432 | doc: /* Set each SYM to the value of its VAL. |
433 | The symbols SYM are variables; they are literal (not evaluated). | |
434 | The values VAL are expressions; they are evaluated. | |
435 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
436 | The second VAL is not computed until after the first SYM is set, and so on; | |
437 | each VAL can use the new value of variables set earlier in the `setq'. | |
438 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 439 | usage: (setq [SYM VAL]...) */) |
5842a27b | 440 | (Lisp_Object args) |
db9f0278 JB |
441 | { |
442 | register Lisp_Object args_left; | |
b9598260 | 443 | register Lisp_Object val, sym, lex_binding; |
db9f0278 JB |
444 | struct gcpro gcpro1; |
445 | ||
1283140e | 446 | if (NILP (args)) |
db9f0278 JB |
447 | return Qnil; |
448 | ||
449 | args_left = args; | |
450 | GCPRO1 (args); | |
451 | ||
452 | do | |
453 | { | |
defb1411 | 454 | val = eval_sub (Fcar (Fcdr (args_left))); |
db9f0278 | 455 | sym = Fcar (args_left); |
b9598260 | 456 | |
defb1411 | 457 | /* Like for eval_sub, we do not check declared_special here since |
f07a954e SM |
458 | it's been done when let-binding. */ |
459 | if (!NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
b9598260 | 460 | && SYMBOLP (sym) |
f07a954e SM |
461 | && !NILP (lex_binding |
462 | = Fassq (sym, Vinternal_interpreter_environment))) | |
b9598260 SM |
463 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ |
464 | else | |
465 | Fset (sym, val); /* SYM is dynamically bound. */ | |
466 | ||
db9f0278 JB |
467 | args_left = Fcdr (Fcdr (args_left)); |
468 | } | |
265a9e55 | 469 | while (!NILP(args_left)); |
db9f0278 JB |
470 | |
471 | UNGCPRO; | |
472 | return val; | |
473 | } | |
177c0ea7 | 474 | |
db9f0278 | 475 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
476 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
477 | usage: (quote ARG) */) | |
5842a27b | 478 | (Lisp_Object args) |
db9f0278 | 479 | { |
1283140e RS |
480 | if (!NILP (Fcdr (args))) |
481 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
482 | return Fcar (args); |
483 | } | |
177c0ea7 | 484 | |
db9f0278 | 485 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
486 | doc: /* Like `quote', but preferred for objects which are functions. |
487 | In byte compilation, `function' causes its argument to be compiled. | |
488 | `quote' cannot do that. | |
489 | usage: (function ARG) */) | |
5842a27b | 490 | (Lisp_Object args) |
db9f0278 | 491 | { |
b9598260 SM |
492 | Lisp_Object quoted = XCAR (args); |
493 | ||
1283140e RS |
494 | if (!NILP (Fcdr (args))) |
495 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
b9598260 SM |
496 | |
497 | if (!NILP (Vinternal_interpreter_environment) | |
498 | && CONSP (quoted) | |
499 | && EQ (XCAR (quoted), Qlambda)) | |
500 | /* This is a lambda expression within a lexical environment; | |
501 | return an interpreted closure instead of a simple lambda. */ | |
23aba0ea SM |
502 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, |
503 | XCDR (quoted))); | |
b9598260 SM |
504 | else |
505 | /* Simply quote the argument. */ | |
506 | return quoted; | |
db9f0278 JB |
507 | } |
508 | ||
e0f331ab | 509 | |
a7ca3326 | 510 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
84b17ab0 | 511 | doc: /* Return t if the containing function was run directly by user input. |
82fc29a1 JB |
512 | This means that the function was called with `call-interactively' |
513 | \(which includes being called as the binding of a key) | |
84b17ab0 | 514 | and input is currently coming from the keyboard (not a keyboard macro), |
c63df42b RS |
515 | and Emacs is not running in batch mode (`noninteractive' is nil). |
516 | ||
517 | The only known proper use of `interactive-p' is in deciding whether to | |
518 | display a helpful message, or how to display it. If you're thinking | |
519 | of using it for any other purpose, it is quite likely that you're | |
520 | making a mistake. Think: what do you want to do when the command is | |
521 | called from a keyboard macro? | |
522 | ||
84b17ab0 CY |
523 | To test whether your function was called with `call-interactively', |
524 | either (i) add an extra optional argument and give it an `interactive' | |
525 | spec that specifies non-nil unconditionally (such as \"p\"); or (ii) | |
526 | use `called-interactively-p'. */) | |
5842a27b | 527 | (void) |
db9f0278 | 528 | { |
b9598260 | 529 | return interactive_p (1) ? Qt : Qnil; |
e0f331ab GM |
530 | } |
531 | ||
532 | ||
9d28c33e | 533 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 1, 0, |
84b17ab0 | 534 | doc: /* Return t if the containing function was called by `call-interactively'. |
9d28c33e SM |
535 | If KIND is `interactive', then only return t if the call was made |
536 | interactively by the user, i.e. not in `noninteractive' mode nor | |
537 | when `executing-kbd-macro'. | |
538 | If KIND is `any', on the other hand, it will return t for any kind of | |
539 | interactive call, including being called as the binding of a key, or | |
540 | from a keyboard macro, or in `noninteractive' mode. | |
541 | ||
542 | The only known proper use of `interactive' for KIND is in deciding | |
543 | whether to display a helpful message, or how to display it. If you're | |
544 | thinking of using it for any other purpose, it is quite likely that | |
545 | you're making a mistake. Think: what do you want to do when the | |
546 | command is called from a keyboard macro? | |
84b17ab0 CY |
547 | |
548 | This function is meant for implementing advice and other | |
549 | function-modifying features. Instead of using this, it is sometimes | |
550 | cleaner to give your function an extra optional argument whose | |
551 | `interactive' spec specifies non-nil unconditionally (\"p\" is a good | |
9d28c33e | 552 | way to do this), or via (not (or executing-kbd-macro noninteractive)). */) |
5842a27b | 553 | (Lisp_Object kind) |
c63df42b | 554 | { |
9d28c33e SM |
555 | return ((INTERACTIVE || !EQ (kind, intern ("interactive"))) |
556 | && interactive_p (1)) ? Qt : Qnil; | |
c63df42b RS |
557 | } |
558 | ||
559 | ||
560 | /* Return 1 if function in which this appears was called using | |
561 | call-interactively. | |
e0f331ab GM |
562 | |
563 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
564 | called is a built-in. */ | |
565 | ||
2f7c71a1 | 566 | static int |
d3da34e0 | 567 | interactive_p (int exclude_subrs_p) |
e0f331ab GM |
568 | { |
569 | struct backtrace *btp; | |
570 | Lisp_Object fun; | |
db9f0278 | 571 | |
db9f0278 | 572 | btp = backtrace_list; |
daa37602 JB |
573 | |
574 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 575 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 576 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
577 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
578 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 579 | btp = btp->next; |
daa37602 JB |
580 | |
581 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
582 | may be a frame for Fbytecode at the top level. In any version of |
583 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
584 | inside catch and condition-case. Skip past them. | |
daa37602 | 585 | |
4402a9ed | 586 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 587 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
588 | while (btp |
589 | && (EQ (*btp->function, Qbytecode) | |
44f230aa | 590 | || btp->nargs == UNEVALLED)) |
a6e3fa71 JB |
591 | btp = btp->next; |
592 | ||
f6d62986 | 593 | /* `btp' now points at the frame of the innermost function that isn't |
daa37602 JB |
594 | a special form, ignoring frames for Finteractive_p and/or |
595 | Fbytecode at the top. If this frame is for a built-in function | |
596 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 597 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
598 | if (exclude_subrs_p && SUBRP (fun)) |
599 | return 0; | |
177c0ea7 | 600 | |
f6d62986 | 601 | /* `btp' points to the frame of a Lisp function that called interactive-p. |
db9f0278 JB |
602 | Return t if that function was called interactively. */ |
603 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
604 | return 1; |
605 | return 0; | |
db9f0278 JB |
606 | } |
607 | ||
e0f331ab | 608 | |
db9f0278 | 609 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
610 | doc: /* Define NAME as a function. |
611 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
612 | See also the function `interactive'. | |
7a25dc6d | 613 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
5842a27b | 614 | (Lisp_Object args) |
db9f0278 JB |
615 | { |
616 | register Lisp_Object fn_name; | |
617 | register Lisp_Object defn; | |
618 | ||
619 | fn_name = Fcar (args); | |
6992a868 | 620 | CHECK_SYMBOL (fn_name); |
db9f0278 | 621 | defn = Fcons (Qlambda, Fcdr (args)); |
f07a954e SM |
622 | if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */ |
623 | defn = Ffunction (Fcons (defn, Qnil)); | |
265a9e55 | 624 | if (!NILP (Vpurify_flag)) |
db9f0278 | 625 | defn = Fpurecopy (defn); |
f58e9f8c RS |
626 | if (CONSP (XSYMBOL (fn_name)->function) |
627 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
628 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 629 | Ffset (fn_name, defn); |
6fd797f5 | 630 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
631 | return fn_name; |
632 | } | |
633 | ||
634 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 635 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
636 | The actual definition looks like |
637 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
638 | When the macro is called, as in (NAME ARGS...), |
639 | the function (lambda ARGLIST BODY...) is applied to | |
640 | the list ARGS... as it appears in the expression, | |
641 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
642 | |
643 | DECL is a declaration, optional, which can specify how to indent | |
4ba50634 JPW |
644 | calls to this macro, how Edebug should handle it, and which argument |
645 | should be treated as documentation. It looks like this: | |
0654d6e3 RS |
646 | (declare SPECS...) |
647 | The elements can look like this: | |
648 | (indent INDENT) | |
649 | Set NAME's `lisp-indent-function' property to INDENT. | |
650 | ||
e509f168 | 651 | (debug DEBUG) |
0654d6e3 | 652 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 653 | equivalent to writing a `def-edebug-spec' for the macro.) |
4ba50634 JPW |
654 | |
655 | (doc-string ELT) | |
656 | Set NAME's `doc-string-elt' property to ELT. | |
657 | ||
0654d6e3 | 658 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
5842a27b | 659 | (Lisp_Object args) |
db9f0278 JB |
660 | { |
661 | register Lisp_Object fn_name; | |
662 | register Lisp_Object defn; | |
d6edd563 | 663 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
664 | |
665 | fn_name = Fcar (args); | |
8e975df9 | 666 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
667 | lambda_list = Fcar (Fcdr (args)); |
668 | tail = Fcdr (Fcdr (args)); | |
669 | ||
670 | doc = Qnil; | |
671 | if (STRINGP (Fcar (tail))) | |
672 | { | |
e509f168 SM |
673 | doc = XCAR (tail); |
674 | tail = XCDR (tail); | |
d6edd563 GM |
675 | } |
676 | ||
0193499f SM |
677 | if (CONSP (Fcar (tail)) |
678 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
d6edd563 GM |
679 | { |
680 | if (!NILP (Vmacro_declaration_function)) | |
681 | { | |
682 | struct gcpro gcpro1; | |
683 | GCPRO1 (args); | |
684 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
685 | UNGCPRO; | |
686 | } | |
177c0ea7 | 687 | |
d6edd563 GM |
688 | tail = Fcdr (tail); |
689 | } | |
690 | ||
691 | if (NILP (doc)) | |
692 | tail = Fcons (lambda_list, tail); | |
693 | else | |
694 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
7200d79c | 695 | |
b9598260 | 696 | defn = Fcons (Qlambda, tail); |
f07a954e SM |
697 | if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */ |
698 | defn = Ffunction (Fcons (defn, Qnil)); | |
b9598260 | 699 | defn = Fcons (Qmacro, defn); |
177c0ea7 | 700 | |
265a9e55 | 701 | if (!NILP (Vpurify_flag)) |
db9f0278 | 702 | defn = Fpurecopy (defn); |
f58e9f8c RS |
703 | if (CONSP (XSYMBOL (fn_name)->function) |
704 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
705 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 706 | Ffset (fn_name, defn); |
6fd797f5 | 707 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
708 | return fn_name; |
709 | } | |
710 | ||
19cebf5a | 711 | |
1848d15d | 712 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 713 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 714 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 715 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
716 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
717 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
718 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
719 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 720 | The return value is BASE-VARIABLE. */) |
5842a27b | 721 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
722 | { |
723 | struct Lisp_Symbol *sym; | |
1848d15d | 724 | |
4a9308b8 JB |
725 | CHECK_SYMBOL (new_alias); |
726 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 727 | |
4a9308b8 | 728 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
729 | |
730 | if (sym->constant) | |
178f2507 SM |
731 | /* Not sure why, but why not? */ |
732 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
733 | |
734 | switch (sym->redirect) | |
735 | { | |
736 | case SYMBOL_FORWARDED: | |
737 | error ("Cannot make an internal variable an alias"); | |
738 | case SYMBOL_LOCALIZED: | |
739 | error ("Don't know how to make a localized variable an alias"); | |
740 | } | |
741 | ||
dd60787c | 742 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
743 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
744 | so that old-code that affects n_a before the aliasing is setup | |
745 | still works. */ | |
746 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 747 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
748 | |
749 | { | |
750 | struct specbinding *p; | |
751 | ||
752 | for (p = specpdl_ptr - 1; p >= specpdl; p--) | |
753 | if (p->func == NULL | |
754 | && (EQ (new_alias, | |
755 | CONSP (p->symbol) ? XCAR (p->symbol) : p->symbol))) | |
756 | error ("Don't know how to make a let-bound variable an alias"); | |
757 | } | |
758 | ||
b9598260 | 759 | sym->declared_special = 1; |
0ac30604 | 760 | XSYMBOL (base_variable)->declared_special = 1; |
ce5b453a SM |
761 | sym->redirect = SYMBOL_VARALIAS; |
762 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
763 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
764 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
765 | /* Even if docstring is nil: remove old docstring. */ |
766 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 767 | |
4a9308b8 | 768 | return base_variable; |
19cebf5a GM |
769 | } |
770 | ||
771 | ||
db9f0278 | 772 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 773 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
774 | You are not required to define a variable in order to use it, |
775 | but the definition can supply documentation and an initial value | |
776 | in a way that tags can recognize. | |
777 | ||
778 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
779 | If SYMBOL is buffer-local, its default value is what is set; | |
780 | buffer-local values are not affected. | |
781 | INITVALUE and DOCSTRING are optional. | |
782 | If DOCSTRING starts with *, this variable is identified as a user option. | |
783 | This means that M-x set-variable recognizes it. | |
784 | See also `user-variable-p'. | |
785 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
786 | |
787 | If SYMBOL has a local binding, then this form affects the local | |
788 | binding. This is usually not what you want. Thus, if you need to | |
789 | load a file defining variables, with this form or with `defconst' or | |
790 | `defcustom', you should always load that file _outside_ any bindings | |
791 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
792 | this respect.) | |
2df5238c | 793 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 794 | (Lisp_Object args) |
db9f0278 | 795 | { |
a42ba017 | 796 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
797 | |
798 | sym = Fcar (args); | |
a42ba017 RS |
799 | tail = Fcdr (args); |
800 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 801 | error ("Too many arguments"); |
a42ba017 | 802 | |
33568849 | 803 | tem = Fdefault_boundp (sym); |
a42ba017 | 804 | if (!NILP (tail)) |
db9f0278 | 805 | { |
ba83908c SM |
806 | /* Do it before evaluating the initial value, for self-references. */ |
807 | XSYMBOL (sym)->declared_special = 1; | |
590130fb | 808 | |
1c9916a1 SM |
809 | if (SYMBOL_CONSTANT_P (sym)) |
810 | { | |
811 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
1faed8ae PE |
812 | Lisp_Object tem1 = Fcar (tail); |
813 | if (! (CONSP (tem1) | |
814 | && EQ (XCAR (tem1), Qquote) | |
815 | && CONSP (XCDR (tem1)) | |
816 | && EQ (XCAR (XCDR (tem1)), sym))) | |
1c9916a1 SM |
817 | error ("Constant symbol `%s' specified in defvar", |
818 | SDATA (SYMBOL_NAME (sym))); | |
819 | } | |
820 | ||
265a9e55 | 821 | if (NILP (tem)) |
defb1411 | 822 | Fset_default (sym, eval_sub (Fcar (tail))); |
d0bce91e SM |
823 | else |
824 | { /* Check if there is really a global binding rather than just a let | |
825 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 826 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
827 | while (--pdl >= specpdl) |
828 | { | |
829 | if (EQ (pdl->symbol, sym) && !pdl->func | |
830 | && EQ (pdl->old_value, Qunbound)) | |
831 | { | |
832 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
833 | SYMBOL_NAME (sym), 1); | |
834 | break; | |
835 | } | |
836 | } | |
837 | } | |
33568849 | 838 | tail = Fcdr (tail); |
e509f168 SM |
839 | tem = Fcar (tail); |
840 | if (!NILP (tem)) | |
33568849 | 841 | { |
33568849 SM |
842 | if (!NILP (Vpurify_flag)) |
843 | tem = Fpurecopy (tem); | |
844 | Fput (sym, Qvariable_documentation, tem); | |
845 | } | |
6fd797f5 | 846 | LOADHIST_ATTACH (sym); |
db9f0278 | 847 | } |
f07a954e SM |
848 | else if (!NILP (Vinternal_interpreter_environment) |
849 | && !XSYMBOL (sym)->declared_special) | |
850 | /* A simple (defvar foo) with lexical scoping does "nothing" except | |
851 | declare that var to be dynamically scoped *locally* (i.e. within | |
852 | the current file or let-block). */ | |
853 | Vinternal_interpreter_environment = | |
854 | Fcons (sym, Vinternal_interpreter_environment); | |
33568849 | 855 | else |
d28a2170 PE |
856 | { |
857 | /* Simple (defvar <var>) should not count as a definition at all. | |
858 | It could get in the way of other definitions, and unloading this | |
859 | package could try to make the variable unbound. */ | |
860 | } | |
addf35fd | 861 | |
db9f0278 JB |
862 | return sym; |
863 | } | |
864 | ||
865 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
866 | doc: /* Define SYMBOL as a constant variable. |
867 | The intent is that neither programs nor users should ever change this value. | |
868 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
869 | If SYMBOL is buffer-local, its default value is what is set; | |
870 | buffer-local values are not affected. | |
871 | DOCSTRING is optional. | |
733f68b6 LT |
872 | |
873 | If SYMBOL has a local binding, then this form sets the local binding's | |
874 | value. However, you should normally not make local bindings for | |
875 | variables defined with this form. | |
7a25dc6d | 876 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 877 | (Lisp_Object args) |
db9f0278 JB |
878 | { |
879 | register Lisp_Object sym, tem; | |
880 | ||
881 | sym = Fcar (args); | |
a42ba017 | 882 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 883 | error ("Too many arguments"); |
a42ba017 | 884 | |
defb1411 | 885 | tem = eval_sub (Fcar (Fcdr (args))); |
1182a7cb DL |
886 | if (!NILP (Vpurify_flag)) |
887 | tem = Fpurecopy (tem); | |
888 | Fset_default (sym, tem); | |
b9598260 | 889 | XSYMBOL (sym)->declared_special = 1; |
db9f0278 | 890 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 891 | if (!NILP (tem)) |
db9f0278 | 892 | { |
265a9e55 | 893 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
894 | tem = Fpurecopy (tem); |
895 | Fput (sym, Qvariable_documentation, tem); | |
896 | } | |
873759d5 | 897 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 898 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
899 | return sym; |
900 | } | |
901 | ||
606cdb89 JB |
902 | /* Error handler used in Fuser_variable_p. */ |
903 | static Lisp_Object | |
d3da34e0 | 904 | user_variable_p_eh (Lisp_Object ignore) |
606cdb89 JB |
905 | { |
906 | return Qnil; | |
907 | } | |
908 | ||
40a69fac SM |
909 | static Lisp_Object |
910 | lisp_indirect_variable (Lisp_Object sym) | |
911 | { | |
cfcbfb1a PE |
912 | struct Lisp_Symbol *s = indirect_variable (XSYMBOL (sym)); |
913 | XSETSYMBOL (sym, s); | |
40a69fac SM |
914 | return sym; |
915 | } | |
916 | ||
db9f0278 | 917 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 918 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 919 | \(The alternative is a variable used internally in a Lisp program.) |
606cdb89 JB |
920 | A variable is a user variable if |
921 | \(1) the first character of its documentation is `*', or | |
922 | \(2) it is customizable (its property list contains a non-nil value | |
923 | of `standard-value' or `custom-autoload'), or | |
924 | \(3) it is an alias for another user variable. | |
925 | Return nil if VARIABLE is an alias and there is a loop in the | |
926 | chain of symbols. */) | |
5842a27b | 927 | (Lisp_Object variable) |
db9f0278 JB |
928 | { |
929 | Lisp_Object documentation; | |
177c0ea7 | 930 | |
5e78e475 RS |
931 | if (!SYMBOLP (variable)) |
932 | return Qnil; | |
933 | ||
606cdb89 | 934 | /* If indirect and there's an alias loop, don't check anything else. */ |
ce5b453a | 935 | if (XSYMBOL (variable)->redirect == SYMBOL_VARALIAS |
40a69fac | 936 | && NILP (internal_condition_case_1 (lisp_indirect_variable, variable, |
bb8e180f | 937 | Qt, user_variable_p_eh))) |
606cdb89 JB |
938 | return Qnil; |
939 | ||
940 | while (1) | |
941 | { | |
942 | documentation = Fget (variable, Qvariable_documentation); | |
943 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
bb8e180f | 944 | return Qt; |
606cdb89 | 945 | if (STRINGP (documentation) |
bb8e180f AS |
946 | && ((unsigned char) SREF (documentation, 0) == '*')) |
947 | return Qt; | |
606cdb89 JB |
948 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ |
949 | if (CONSP (documentation) | |
bb8e180f AS |
950 | && STRINGP (XCAR (documentation)) |
951 | && INTEGERP (XCDR (documentation)) | |
952 | && XINT (XCDR (documentation)) < 0) | |
953 | return Qt; | |
606cdb89 JB |
954 | /* Customizable? See `custom-variable-p'. */ |
955 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
bb8e180f AS |
956 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) |
957 | return Qt; | |
606cdb89 | 958 | |
ce5b453a | 959 | if (!(XSYMBOL (variable)->redirect == SYMBOL_VARALIAS)) |
bb8e180f | 960 | return Qnil; |
606cdb89 JB |
961 | |
962 | /* An indirect variable? Let's follow the chain. */ | |
ce5b453a | 963 | XSETSYMBOL (variable, SYMBOL_ALIAS (XSYMBOL (variable))); |
606cdb89 | 964 | } |
177c0ea7 | 965 | } |
db9f0278 JB |
966 | \f |
967 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
968 | doc: /* Bind variables according to VARLIST then eval BODY. |
969 | The value of the last form in BODY is returned. | |
970 | Each element of VARLIST is a symbol (which is bound to nil) | |
971 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
972 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 973 | usage: (let* VARLIST BODY...) */) |
5842a27b | 974 | (Lisp_Object args) |
db9f0278 | 975 | { |
b9598260 | 976 | Lisp_Object varlist, var, val, elt, lexenv; |
aed13378 | 977 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
978 | struct gcpro gcpro1, gcpro2, gcpro3; |
979 | ||
980 | GCPRO3 (args, elt, varlist); | |
981 | ||
b9598260 SM |
982 | lexenv = Vinternal_interpreter_environment; |
983 | ||
db9f0278 | 984 | varlist = Fcar (args); |
b9598260 | 985 | while (CONSP (varlist)) |
db9f0278 JB |
986 | { |
987 | QUIT; | |
b9598260 SM |
988 | |
989 | elt = XCAR (varlist); | |
90165123 | 990 | if (SYMBOLP (elt)) |
b9598260 SM |
991 | { |
992 | var = elt; | |
993 | val = Qnil; | |
994 | } | |
08564963 | 995 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 996 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
997 | else |
998 | { | |
b9598260 | 999 | var = Fcar (elt); |
defb1411 | 1000 | val = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 | 1001 | } |
b9598260 | 1002 | |
f07a954e SM |
1003 | if (!NILP (lexenv) && SYMBOLP (var) |
1004 | && !XSYMBOL (var)->declared_special | |
1005 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
1006 | /* Lexically bind VAR by adding it to the interpreter's binding |
1007 | alist. */ | |
1008 | { | |
f07a954e SM |
1009 | Lisp_Object newenv |
1010 | = Fcons (Fcons (var, val), Vinternal_interpreter_environment); | |
1011 | if (EQ (Vinternal_interpreter_environment, lexenv)) | |
1012 | /* Save the old lexical environment on the specpdl stack, | |
1013 | but only for the first lexical binding, since we'll never | |
1014 | need to revert to one of the intermediate ones. */ | |
1015 | specbind (Qinternal_interpreter_environment, newenv); | |
1016 | else | |
1017 | Vinternal_interpreter_environment = newenv; | |
db9f0278 | 1018 | } |
b9598260 SM |
1019 | else |
1020 | specbind (var, val); | |
1021 | ||
1022 | varlist = XCDR (varlist); | |
db9f0278 JB |
1023 | } |
1024 | UNGCPRO; | |
1025 | val = Fprogn (Fcdr (args)); | |
1026 | return unbind_to (count, val); | |
1027 | } | |
1028 | ||
1029 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1030 | doc: /* Bind variables according to VARLIST then eval BODY. |
1031 | The value of the last form in BODY is returned. | |
1032 | Each element of VARLIST is a symbol (which is bound to nil) | |
1033 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1034 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 1035 | usage: (let VARLIST BODY...) */) |
5842a27b | 1036 | (Lisp_Object args) |
db9f0278 | 1037 | { |
b9598260 | 1038 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 1039 | register Lisp_Object elt, varlist; |
aed13378 | 1040 | int count = SPECPDL_INDEX (); |
f66c7cf8 | 1041 | ptrdiff_t argnum; |
db9f0278 | 1042 | struct gcpro gcpro1, gcpro2; |
3a7a9129 | 1043 | USE_SAFE_ALLOCA; |
db9f0278 JB |
1044 | |
1045 | varlist = Fcar (args); | |
1046 | ||
f6d62986 | 1047 | /* Make space to hold the values to give the bound variables. */ |
db9f0278 | 1048 | elt = Flength (varlist); |
b72e0717 | 1049 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 | 1050 | |
f6d62986 | 1051 | /* Compute the values and store them in `temps'. */ |
db9f0278 JB |
1052 | |
1053 | GCPRO2 (args, *temps); | |
1054 | gcpro2.nvars = 0; | |
1055 | ||
67ee9f6e | 1056 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
1057 | { |
1058 | QUIT; | |
67ee9f6e | 1059 | elt = XCAR (varlist); |
90165123 | 1060 | if (SYMBOLP (elt)) |
db9f0278 | 1061 | temps [argnum++] = Qnil; |
08564963 | 1062 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1063 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 | 1064 | else |
defb1411 | 1065 | temps [argnum++] = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 JB |
1066 | gcpro2.nvars = argnum; |
1067 | } | |
1068 | UNGCPRO; | |
1069 | ||
b9598260 SM |
1070 | lexenv = Vinternal_interpreter_environment; |
1071 | ||
db9f0278 | 1072 | varlist = Fcar (args); |
67ee9f6e | 1073 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 1074 | { |
b9598260 SM |
1075 | Lisp_Object var; |
1076 | ||
67ee9f6e | 1077 | elt = XCAR (varlist); |
b9598260 | 1078 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 1079 | tem = temps[argnum++]; |
b9598260 | 1080 | |
f07a954e SM |
1081 | if (!NILP (lexenv) && SYMBOLP (var) |
1082 | && !XSYMBOL (var)->declared_special | |
1083 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
1084 | /* Lexically bind VAR by adding it to the lexenv alist. */ |
1085 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 1086 | else |
b9598260 SM |
1087 | /* Dynamically bind VAR. */ |
1088 | specbind (var, tem); | |
db9f0278 JB |
1089 | } |
1090 | ||
b9598260 SM |
1091 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
1092 | /* Instantiate a new lexical environment. */ | |
1093 | specbind (Qinternal_interpreter_environment, lexenv); | |
1094 | ||
db9f0278 | 1095 | elt = Fprogn (Fcdr (args)); |
3a7a9129 | 1096 | SAFE_FREE (); |
db9f0278 JB |
1097 | return unbind_to (count, elt); |
1098 | } | |
1099 | ||
1100 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1101 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1102 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1103 | until TEST returns nil. | |
7a25dc6d | 1104 | usage: (while TEST BODY...) */) |
5842a27b | 1105 | (Lisp_Object args) |
db9f0278 | 1106 | { |
2b9bde76 | 1107 | Lisp_Object test, body; |
db9f0278 JB |
1108 | struct gcpro gcpro1, gcpro2; |
1109 | ||
1110 | GCPRO2 (test, body); | |
1111 | ||
1112 | test = Fcar (args); | |
1113 | body = Fcdr (args); | |
defb1411 | 1114 | while (!NILP (eval_sub (test))) |
db9f0278 JB |
1115 | { |
1116 | QUIT; | |
1117 | Fprogn (body); | |
1118 | } | |
1119 | ||
1120 | UNGCPRO; | |
1121 | return Qnil; | |
1122 | } | |
1123 | ||
1124 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1125 | doc: /* Return result of expanding macros at top level of FORM. |
1126 | If FORM is not a macro call, it is returned unchanged. | |
1127 | Otherwise, the macro is expanded and the expansion is considered | |
1128 | in place of FORM. When a non-macro-call results, it is returned. | |
1129 | ||
1130 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1131 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 1132 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 1133 | { |
23d6b5a6 | 1134 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1135 | register Lisp_Object expander, sym, def, tem; |
1136 | ||
1137 | while (1) | |
1138 | { | |
1139 | /* Come back here each time we expand a macro call, | |
1140 | in case it expands into another macro call. */ | |
90165123 | 1141 | if (!CONSP (form)) |
db9f0278 | 1142 | break; |
23d6b5a6 | 1143 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1144 | def = sym = XCAR (form); |
23d6b5a6 | 1145 | tem = Qnil; |
db9f0278 JB |
1146 | /* Trace symbols aliases to other symbols |
1147 | until we get a symbol that is not an alias. */ | |
90165123 | 1148 | while (SYMBOLP (def)) |
db9f0278 JB |
1149 | { |
1150 | QUIT; | |
23d6b5a6 | 1151 | sym = def; |
79e8bfbf | 1152 | tem = Fassq (sym, environment); |
265a9e55 | 1153 | if (NILP (tem)) |
db9f0278 JB |
1154 | { |
1155 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1156 | if (!EQ (def, Qunbound)) |
1157 | continue; | |
db9f0278 | 1158 | } |
23d6b5a6 | 1159 | break; |
db9f0278 | 1160 | } |
79e8bfbf | 1161 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1162 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1163 | if (NILP (tem)) |
db9f0278 | 1164 | { |
79e8bfbf | 1165 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1166 | Look at its function definition. */ |
90165123 | 1167 | if (EQ (def, Qunbound) || !CONSP (def)) |
f6d62986 | 1168 | /* Not defined or definition not suitable. */ |
db9f0278 | 1169 | break; |
03699b14 | 1170 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1171 | { |
1172 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1173 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1174 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1175 | /* Yes, load it and try again. */ |
1176 | { | |
ca20916b RS |
1177 | struct gcpro gcpro1; |
1178 | GCPRO1 (form); | |
ee9ee63c | 1179 | do_autoload (def, sym); |
ca20916b | 1180 | UNGCPRO; |
ee9ee63c JB |
1181 | continue; |
1182 | } | |
1183 | else | |
db9f0278 | 1184 | break; |
db9f0278 | 1185 | } |
03699b14 | 1186 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1187 | break; |
03699b14 | 1188 | else expander = XCDR (def); |
db9f0278 JB |
1189 | } |
1190 | else | |
1191 | { | |
03699b14 | 1192 | expander = XCDR (tem); |
265a9e55 | 1193 | if (NILP (expander)) |
db9f0278 JB |
1194 | break; |
1195 | } | |
03699b14 | 1196 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1197 | } |
1198 | return form; | |
1199 | } | |
1200 | \f | |
1201 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1202 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1203 | TAG is evalled to get the tag to use; it must not be nil. | |
1204 | ||
1205 | Then the BODY is executed. | |
1d632ccf | 1206 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1207 | If no throw happens, `catch' returns the value of the last BODY form. |
1208 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1209 | usage: (catch TAG BODY...) */) |
5842a27b | 1210 | (Lisp_Object args) |
db9f0278 JB |
1211 | { |
1212 | register Lisp_Object tag; | |
1213 | struct gcpro gcpro1; | |
1214 | ||
1215 | GCPRO1 (args); | |
defb1411 | 1216 | tag = eval_sub (Fcar (args)); |
db9f0278 JB |
1217 | UNGCPRO; |
1218 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1219 | } | |
1220 | ||
1221 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1222 | FUNC should return a Lisp_Object. | |
1223 | This is how catches are done from within C code. */ | |
1224 | ||
1225 | Lisp_Object | |
d3da34e0 | 1226 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1227 | { |
1228 | /* This structure is made part of the chain `catchlist'. */ | |
1229 | struct catchtag c; | |
1230 | ||
1231 | /* Fill in the components of c, and put it on the list. */ | |
1232 | c.next = catchlist; | |
1233 | c.tag = tag; | |
1234 | c.val = Qnil; | |
1235 | c.backlist = backtrace_list; | |
1236 | c.handlerlist = handlerlist; | |
1237 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1238 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1239 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1240 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1241 | c.gcpro = gcprolist; |
bcf28080 | 1242 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1243 | catchlist = &c; |
1244 | ||
1245 | /* Call FUNC. */ | |
1246 | if (! _setjmp (c.jmp)) | |
1247 | c.val = (*func) (arg); | |
1248 | ||
1249 | /* Throw works by a longjmp that comes right here. */ | |
1250 | catchlist = c.next; | |
1251 | return c.val; | |
1252 | } | |
1253 | ||
ba410f40 JB |
1254 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1255 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1256 | |
ba410f40 JB |
1257 | This is the guts Fthrow and Fsignal; they differ only in the way |
1258 | they choose the catch tag to throw to. A catch tag for a | |
1259 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1260 | |
ba410f40 JB |
1261 | Before each catch is discarded, unbind all special bindings and |
1262 | execute all unwind-protect clauses made above that catch. Unwind | |
1263 | the handler stack as we go, so that the proper handlers are in | |
1264 | effect for each unwind-protect clause we run. At the end, restore | |
1265 | some static info saved in CATCH, and longjmp to the location | |
1266 | specified in the | |
1267 | ||
1268 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1269 | |
1270 | static void | |
d3da34e0 | 1271 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 JB |
1272 | { |
1273 | register int last_time; | |
1274 | ||
ba410f40 JB |
1275 | /* Save the value in the tag. */ |
1276 | catch->val = value; | |
1277 | ||
0b31741c | 1278 | /* Restore certain special C variables. */ |
1cdc3155 | 1279 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1280 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1281 | handling_signal = 0; |
69bbd6bd | 1282 | immediate_quit = 0; |
82da7701 | 1283 | |
db9f0278 JB |
1284 | do |
1285 | { | |
1286 | last_time = catchlist == catch; | |
82da7701 JB |
1287 | |
1288 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1289 | handlers. */ |
db9f0278 JB |
1290 | unbind_to (catchlist->pdlcount, Qnil); |
1291 | handlerlist = catchlist->handlerlist; | |
1292 | catchlist = catchlist->next; | |
1293 | } | |
1294 | while (! last_time); | |
1295 | ||
a2a103bb | 1296 | #if HAVE_X_WINDOWS |
88019a63 RS |
1297 | /* If x_catch_errors was done, turn it off now. |
1298 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 | 1299 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
bb8e180f AS |
1300 | The catch must remain in effect during that delicate |
1301 | state. --lorentey */ | |
88019a63 | 1302 | x_fully_uncatch_errors (); |
e6aee454 | 1303 | #endif |
a2a103bb | 1304 | #endif |
88019a63 | 1305 | |
bcf28080 | 1306 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1307 | gcprolist = catch->gcpro; |
15934ffa | 1308 | #ifdef DEBUG_GCPRO |
d8e2b5ba | 1309 | gcpro_level = gcprolist ? gcprolist->level + 1 : 0; |
15934ffa | 1310 | #endif |
db9f0278 JB |
1311 | backtrace_list = catch->backlist; |
1312 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1313 | |
ba410f40 | 1314 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1315 | } |
1316 | ||
a7ca3326 | 1317 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, |
9dbc9081 PJ |
1318 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1319 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1320 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1321 | { |
1322 | register struct catchtag *c; | |
1323 | ||
8788120f KS |
1324 | if (!NILP (tag)) |
1325 | for (c = catchlist; c; c = c->next) | |
1326 | { | |
1327 | if (EQ (c->tag, tag)) | |
1328 | unwind_to_catch (c, value); | |
1329 | } | |
734d55a2 | 1330 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1331 | } |
1332 | ||
1333 | ||
1334 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1335 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1336 | If BODYFORM completes normally, its value is returned | |
1337 | after executing the UNWINDFORMS. | |
1338 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1339 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1340 | (Lisp_Object args) |
db9f0278 JB |
1341 | { |
1342 | Lisp_Object val; | |
aed13378 | 1343 | int count = SPECPDL_INDEX (); |
db9f0278 | 1344 | |
04b28167 | 1345 | record_unwind_protect (Fprogn, Fcdr (args)); |
defb1411 | 1346 | val = eval_sub (Fcar (args)); |
177c0ea7 | 1347 | return unbind_to (count, val); |
db9f0278 JB |
1348 | } |
1349 | \f | |
db9f0278 | 1350 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, |
9dbc9081 | 1351 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1352 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1353 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1354 | where the BODY is made of Lisp expressions. | |
1355 | ||
1356 | A handler is applicable to an error | |
1357 | if CONDITION-NAME is one of the error's condition names. | |
1358 | If an error happens, the first applicable handler is run. | |
1359 | ||
1360 | The car of a handler may be a list of condition names | |
c997bb25 | 1361 | instead of a single condition name. Then it handles all of them. |
9dbc9081 | 1362 | |
c997bb25 RS |
1363 | When a handler handles an error, control returns to the `condition-case' |
1364 | and it executes the handler's BODY... | |
d0acbbaf | 1365 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1366 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1367 | Then the value of the last BODY form is returned from the `condition-case' |
1368 | expression. | |
9dbc9081 | 1369 | |
9dbc9081 | 1370 | See also the function `signal' for more info. |
2b47b74d | 1371 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1372 | (Lisp_Object args) |
db9f0278 | 1373 | { |
17401c97 GM |
1374 | register Lisp_Object bodyform, handlers; |
1375 | volatile Lisp_Object var; | |
db9f0278 | 1376 | |
82da7701 JB |
1377 | var = Fcar (args); |
1378 | bodyform = Fcar (Fcdr (args)); | |
1379 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1380 | |
1381 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1382 | } | |
1383 | ||
1384 | /* Like Fcondition_case, but the args are separate | |
1385 | rather than passed in a list. Used by Fbyte_code. */ | |
1386 | ||
1387 | Lisp_Object | |
d3da34e0 JB |
1388 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1389 | Lisp_Object handlers) | |
ee830945 RS |
1390 | { |
1391 | Lisp_Object val; | |
1392 | struct catchtag c; | |
1393 | struct handler h; | |
1394 | ||
b7826503 | 1395 | CHECK_SYMBOL (var); |
82da7701 | 1396 | |
2b47b74d | 1397 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1398 | { |
1399 | Lisp_Object tem; | |
2b47b74d | 1400 | tem = XCAR (val); |
5f96776a RS |
1401 | if (! (NILP (tem) |
1402 | || (CONSP (tem) | |
03699b14 KR |
1403 | && (SYMBOLP (XCAR (tem)) |
1404 | || CONSP (XCAR (tem)))))) | |
e6c3da20 EZ |
1405 | error ("Invalid condition handler: %s", |
1406 | SDATA (Fprin1_to_string (tem, Qt))); | |
82da7701 | 1407 | } |
db9f0278 JB |
1408 | |
1409 | c.tag = Qnil; | |
1410 | c.val = Qnil; | |
1411 | c.backlist = backtrace_list; | |
1412 | c.handlerlist = handlerlist; | |
1413 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1414 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1415 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1416 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1417 | c.gcpro = gcprolist; |
bcf28080 | 1418 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1419 | if (_setjmp (c.jmp)) |
1420 | { | |
265a9e55 | 1421 | if (!NILP (h.var)) |
bb8e180f | 1422 | specbind (h.var, c.val); |
9d58218c | 1423 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1424 | |
1425 | /* Note that this just undoes the binding of h.var; whoever | |
1426 | longjumped to us unwound the stack to c.pdlcount before | |
1427 | throwing. */ | |
db9f0278 JB |
1428 | unbind_to (c.pdlcount, Qnil); |
1429 | return val; | |
1430 | } | |
1431 | c.next = catchlist; | |
1432 | catchlist = &c; | |
177c0ea7 | 1433 | |
82da7701 JB |
1434 | h.var = var; |
1435 | h.handler = handlers; | |
db9f0278 | 1436 | h.next = handlerlist; |
db9f0278 JB |
1437 | h.tag = &c; |
1438 | handlerlist = &h; | |
1439 | ||
defb1411 | 1440 | val = eval_sub (bodyform); |
db9f0278 JB |
1441 | catchlist = c.next; |
1442 | handlerlist = h.next; | |
1443 | return val; | |
1444 | } | |
1445 | ||
f029ca5f RS |
1446 | /* Call the function BFUN with no arguments, catching errors within it |
1447 | according to HANDLERS. If there is an error, call HFUN with | |
1448 | one argument which is the data that describes the error: | |
1449 | (SIGNALNAME . DATA) | |
1450 | ||
1451 | HANDLERS can be a list of conditions to catch. | |
1452 | If HANDLERS is Qt, catch all errors. | |
1453 | If HANDLERS is Qerror, catch all errors | |
1454 | but allow the debugger to run if that is enabled. */ | |
1455 | ||
db9f0278 | 1456 | Lisp_Object |
d3da34e0 JB |
1457 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1458 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1459 | { |
1460 | Lisp_Object val; | |
1461 | struct catchtag c; | |
1462 | struct handler h; | |
1463 | ||
88019a63 RS |
1464 | /* Since Fsignal will close off all calls to x_catch_errors, |
1465 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1466 | #if HAVE_X_WINDOWS |
88019a63 | 1467 | if (x_catching_errors ()) |
01591d17 | 1468 | abort (); |
a2a103bb | 1469 | #endif |
01591d17 | 1470 | |
db9f0278 JB |
1471 | c.tag = Qnil; |
1472 | c.val = Qnil; | |
1473 | c.backlist = backtrace_list; | |
1474 | c.handlerlist = handlerlist; | |
1475 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1476 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1477 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1478 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1479 | c.gcpro = gcprolist; |
bcf28080 | 1480 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1481 | if (_setjmp (c.jmp)) |
1482 | { | |
9d58218c | 1483 | return (*hfun) (c.val); |
db9f0278 JB |
1484 | } |
1485 | c.next = catchlist; | |
1486 | catchlist = &c; | |
1487 | h.handler = handlers; | |
1488 | h.var = Qnil; | |
db9f0278 JB |
1489 | h.next = handlerlist; |
1490 | h.tag = &c; | |
1491 | handlerlist = &h; | |
1492 | ||
1493 | val = (*bfun) (); | |
1494 | catchlist = c.next; | |
1495 | handlerlist = h.next; | |
1496 | return val; | |
1497 | } | |
1498 | ||
2659a09f | 1499 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1500 | |
d227775c | 1501 | Lisp_Object |
d3da34e0 JB |
1502 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1503 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1504 | { |
1505 | Lisp_Object val; | |
1506 | struct catchtag c; | |
1507 | struct handler h; | |
1508 | ||
88019a63 RS |
1509 | /* Since Fsignal will close off all calls to x_catch_errors, |
1510 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1511 | #if HAVE_X_WINDOWS |
88019a63 RS |
1512 | if (x_catching_errors ()) |
1513 | abort (); | |
a2a103bb | 1514 | #endif |
88019a63 | 1515 | |
d227775c RS |
1516 | c.tag = Qnil; |
1517 | c.val = Qnil; | |
1518 | c.backlist = backtrace_list; | |
1519 | c.handlerlist = handlerlist; | |
1520 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1521 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1522 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1523 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1524 | c.gcpro = gcprolist; |
bcf28080 | 1525 | c.byte_stack = byte_stack_list; |
d227775c RS |
1526 | if (_setjmp (c.jmp)) |
1527 | { | |
9d58218c | 1528 | return (*hfun) (c.val); |
d227775c RS |
1529 | } |
1530 | c.next = catchlist; | |
1531 | catchlist = &c; | |
1532 | h.handler = handlers; | |
1533 | h.var = Qnil; | |
1534 | h.next = handlerlist; | |
1535 | h.tag = &c; | |
1536 | handlerlist = &h; | |
1537 | ||
1538 | val = (*bfun) (arg); | |
1539 | catchlist = c.next; | |
1540 | handlerlist = h.next; | |
1541 | return val; | |
1542 | } | |
10b29d41 | 1543 | |
53967e09 CY |
1544 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1545 | its arguments. */ | |
1546 | ||
1547 | Lisp_Object | |
178f2507 SM |
1548 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1549 | Lisp_Object arg1, | |
1550 | Lisp_Object arg2, | |
1551 | Lisp_Object handlers, | |
1552 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1553 | { |
1554 | Lisp_Object val; | |
1555 | struct catchtag c; | |
1556 | struct handler h; | |
1557 | ||
1558 | /* Since Fsignal will close off all calls to x_catch_errors, | |
1559 | we will get the wrong results if some are not closed now. */ | |
1560 | #if HAVE_X_WINDOWS | |
1561 | if (x_catching_errors ()) | |
1562 | abort (); | |
1563 | #endif | |
1564 | ||
1565 | c.tag = Qnil; | |
1566 | c.val = Qnil; | |
1567 | c.backlist = backtrace_list; | |
1568 | c.handlerlist = handlerlist; | |
1569 | c.lisp_eval_depth = lisp_eval_depth; | |
1570 | c.pdlcount = SPECPDL_INDEX (); | |
1571 | c.poll_suppress_count = poll_suppress_count; | |
1572 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1573 | c.gcpro = gcprolist; | |
1574 | c.byte_stack = byte_stack_list; | |
1575 | if (_setjmp (c.jmp)) | |
1576 | { | |
1577 | return (*hfun) (c.val); | |
1578 | } | |
1579 | c.next = catchlist; | |
1580 | catchlist = &c; | |
1581 | h.handler = handlers; | |
1582 | h.var = Qnil; | |
1583 | h.next = handlerlist; | |
1584 | h.tag = &c; | |
1585 | handlerlist = &h; | |
1586 | ||
1587 | val = (*bfun) (arg1, arg2); | |
1588 | catchlist = c.next; | |
1589 | handlerlist = h.next; | |
1590 | return val; | |
1591 | } | |
10b29d41 | 1592 | |
2659a09f | 1593 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1594 | and ARGS as second argument. */ |
1595 | ||
1596 | Lisp_Object | |
f66c7cf8 PE |
1597 | internal_condition_case_n (Lisp_Object (*bfun) (ptrdiff_t, Lisp_Object *), |
1598 | ptrdiff_t nargs, | |
178f2507 SM |
1599 | Lisp_Object *args, |
1600 | Lisp_Object handlers, | |
1601 | Lisp_Object (*hfun) (Lisp_Object)) | |
10b29d41 GM |
1602 | { |
1603 | Lisp_Object val; | |
1604 | struct catchtag c; | |
1605 | struct handler h; | |
1606 | ||
88019a63 RS |
1607 | /* Since Fsignal will close off all calls to x_catch_errors, |
1608 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1609 | #if HAVE_X_WINDOWS |
88019a63 RS |
1610 | if (x_catching_errors ()) |
1611 | abort (); | |
a2a103bb | 1612 | #endif |
88019a63 | 1613 | |
10b29d41 GM |
1614 | c.tag = Qnil; |
1615 | c.val = Qnil; | |
1616 | c.backlist = backtrace_list; | |
1617 | c.handlerlist = handlerlist; | |
1618 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1619 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1620 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1621 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1622 | c.gcpro = gcprolist; |
1623 | c.byte_stack = byte_stack_list; | |
1624 | if (_setjmp (c.jmp)) | |
1625 | { | |
1626 | return (*hfun) (c.val); | |
1627 | } | |
1628 | c.next = catchlist; | |
1629 | catchlist = &c; | |
1630 | h.handler = handlers; | |
1631 | h.var = Qnil; | |
1632 | h.next = handlerlist; | |
1633 | h.tag = &c; | |
1634 | handlerlist = &h; | |
1635 | ||
1636 | val = (*bfun) (nargs, args); | |
1637 | catchlist = c.next; | |
1638 | handlerlist = h.next; | |
1639 | return val; | |
1640 | } | |
1641 | ||
d227775c | 1642 | \f |
7d47b580 | 1643 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object); |
e7f7fbaa SM |
1644 | static int maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1645 | Lisp_Object data); | |
db9f0278 | 1646 | |
a7ca3326 | 1647 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, |
9dbc9081 PJ |
1648 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1649 | This function does not return. | |
1650 | ||
1651 | An error symbol is a symbol with an `error-conditions' property | |
1652 | that is a list of condition names. | |
1653 | A handler for any of those names will get to handle this signal. | |
1654 | The symbol `error' should normally be one of them. | |
1655 | ||
1656 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1657 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1658 | error message is constructed. | |
9dbc9081 PJ |
1659 | If the signal is handled, DATA is made available to the handler. |
1660 | See also the function `condition-case'. */) | |
5842a27b | 1661 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1662 | { |
bfa8ca43 | 1663 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1664 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1665 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1666 | Lisp_Object conditions; |
c11d3d17 | 1667 | Lisp_Object string; |
e7f7fbaa SM |
1668 | Lisp_Object real_error_symbol |
1669 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1670 | register Lisp_Object clause = Qnil; | |
1671 | struct handler *h; | |
a2ff3819 | 1672 | struct backtrace *bp; |
db9f0278 | 1673 | |
346598f1 | 1674 | immediate_quit = handling_signal = 0; |
d063129f | 1675 | abort_on_gc = 0; |
db9f0278 JB |
1676 | if (gc_in_progress || waiting_for_input) |
1677 | abort (); | |
1678 | ||
26631f2b RS |
1679 | #if 0 /* rms: I don't know why this was here, |
1680 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1681 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1682 | if (display_hourglass_p) |
1683 | cancel_hourglass (); | |
48f8dfa3 | 1684 | #endif |
177c0ea7 | 1685 | #endif |
48f8dfa3 | 1686 | |
61ede770 | 1687 | /* This hook is used by edebug. */ |
26631f2b RS |
1688 | if (! NILP (Vsignal_hook_function) |
1689 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1690 | { |
1691 | /* Edebug takes care of restoring these variables when it exits. */ | |
1692 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1693 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1694 | ||
1695 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1696 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1697 | ||
1698 | call2 (Vsignal_hook_function, error_symbol, data); | |
1699 | } | |
61ede770 | 1700 | |
1ea9dec4 | 1701 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1702 | |
a2ff3819 GM |
1703 | /* Remember from where signal was called. Skip over the frame for |
1704 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1705 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1706 | is a memory-full error. */ | |
090a072f | 1707 | Vsignaling_function = Qnil; |
26631f2b | 1708 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1709 | { |
1710 | bp = backtrace_list->next; | |
1711 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1712 | bp = bp->next; | |
1713 | if (bp && bp->function) | |
1714 | Vsignaling_function = *bp->function; | |
1715 | } | |
a2ff3819 | 1716 | |
e7f7fbaa | 1717 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1718 | { |
7d47b580 | 1719 | clause = find_handler_clause (h->handler, conditions); |
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); |
583f48b9 | 1760 | fatal ("%s", SDATA (string)); |
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 | 1889 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
7d47b580 JB |
1890 | SIG and DATA describe the signal. There are two ways to pass them: |
1891 | = SIG is the error symbol, and DATA is the rest of the data. | |
1892 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). | |
1893 | This is for memory-full errors only. */ | |
ddaa36e1 | 1894 | static int |
d3da34e0 | 1895 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1896 | { |
1897 | Lisp_Object combined_data; | |
1898 | ||
1899 | combined_data = Fcons (sig, data); | |
1900 | ||
1901 | if ( | |
1902 | /* Don't try to run the debugger with interrupts blocked. | |
1903 | The editing loop would return anyway. */ | |
1904 | ! INPUT_BLOCKED_P | |
1905 | /* Does user want to enter debugger for this kind of error? */ | |
1906 | && (EQ (sig, Qquit) | |
1907 | ? debug_on_quit | |
1908 | : wants_debugger (Vdebug_on_error, conditions)) | |
1909 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1910 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1911 | && when_entered_debugger < num_nonmacro_input_events) |
1912 | { | |
1913 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1914 | return 1; | |
1915 | } | |
1916 | ||
1917 | return 0; | |
1918 | } | |
1919 | ||
db9f0278 | 1920 | static Lisp_Object |
7d47b580 | 1921 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions) |
db9f0278 JB |
1922 | { |
1923 | register Lisp_Object h; | |
db9f0278 | 1924 | |
f01cbfdd RS |
1925 | /* t is used by handlers for all conditions, set up by C code. */ |
1926 | if (EQ (handlers, Qt)) | |
db9f0278 | 1927 | return Qt; |
f01cbfdd | 1928 | |
61ede770 RS |
1929 | /* error is used similarly, but means print an error message |
1930 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1931 | if (EQ (handlers, Qerror)) |
1932 | return Qt; | |
f01cbfdd | 1933 | |
e7f7fbaa | 1934 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1935 | { |
e7f7fbaa SM |
1936 | Lisp_Object handler = XCAR (h); |
1937 | Lisp_Object condit, tem; | |
5f96776a | 1938 | |
5f96776a | 1939 | if (!CONSP (handler)) |
db9f0278 | 1940 | continue; |
e7f7fbaa | 1941 | condit = XCAR (handler); |
5f96776a RS |
1942 | /* Handle a single condition name in handler HANDLER. */ |
1943 | if (SYMBOLP (condit)) | |
1944 | { | |
1945 | tem = Fmemq (Fcar (handler), conditions); | |
1946 | if (!NILP (tem)) | |
1947 | return handler; | |
1948 | } | |
1949 | /* Handle a list of condition names in handler HANDLER. */ | |
1950 | else if (CONSP (condit)) | |
1951 | { | |
f01cbfdd RS |
1952 | Lisp_Object tail; |
1953 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1954 | { |
e7f7fbaa | 1955 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1956 | if (!NILP (tem)) |
e7f7fbaa | 1957 | return handler; |
5f96776a RS |
1958 | } |
1959 | } | |
db9f0278 | 1960 | } |
f01cbfdd | 1961 | |
db9f0278 JB |
1962 | return Qnil; |
1963 | } | |
1964 | ||
db9f0278 | 1965 | |
f6d62986 | 1966 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1967 | void |
b3ffc17c | 1968 | verror (const char *m, va_list ap) |
db9f0278 | 1969 | { |
70476b54 | 1970 | char buf[4000]; |
5fdb398c | 1971 | size_t size = sizeof buf; |
c9d624c6 | 1972 | size_t size_max = STRING_BYTES_BOUND + 1; |
e6c3da20 | 1973 | size_t mlen = strlen (m); |
9125da08 | 1974 | char *buffer = buf; |
e6c3da20 | 1975 | size_t used; |
9125da08 RS |
1976 | Lisp_Object string; |
1977 | ||
db9f0278 | 1978 | while (1) |
9125da08 | 1979 | { |
c378da0b PE |
1980 | va_list ap_copy; |
1981 | va_copy (ap_copy, ap); | |
1982 | used = doprnt (buffer, size, m, m + mlen, ap_copy); | |
1983 | va_end (ap_copy); | |
eb3f1cc8 | 1984 | |
e6c3da20 EZ |
1985 | /* Note: the -1 below is because `doprnt' returns the number of bytes |
1986 | excluding the terminating null byte, and it always terminates with a | |
1987 | null byte, even when producing a truncated message. */ | |
1988 | if (used < size - 1) | |
eb3f1cc8 | 1989 | break; |
e6c3da20 EZ |
1990 | if (size <= size_max / 2) |
1991 | size *= 2; | |
825cd63c EZ |
1992 | else if (size < size_max) |
1993 | size = size_max; | |
e6c3da20 EZ |
1994 | else |
1995 | break; /* and leave the message truncated */ | |
eb3f1cc8 | 1996 | |
825cd63c EZ |
1997 | if (buffer != buf) |
1998 | xfree (buffer); | |
1999 | buffer = (char *) xmalloc (size); | |
9125da08 RS |
2000 | } |
2001 | ||
5fdb398c | 2002 | string = make_string (buffer, used); |
eb3f1cc8 | 2003 | if (buffer != buf) |
9ae6734f | 2004 | xfree (buffer); |
9125da08 | 2005 | |
734d55a2 | 2006 | xsignal1 (Qerror, string); |
db9f0278 | 2007 | } |
b3ffc17c DN |
2008 | |
2009 | ||
f6d62986 | 2010 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
2011 | |
2012 | /* VARARGS 1 */ | |
2013 | void | |
2014 | error (const char *m, ...) | |
2015 | { | |
2016 | va_list ap; | |
2017 | va_start (ap, m); | |
2018 | verror (m, ap); | |
2019 | va_end (ap); | |
2020 | } | |
db9f0278 | 2021 | \f |
a7ca3326 | 2022 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
2023 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
2024 | This means it contains a description for how to read arguments to give it. | |
2025 | The value is nil for an invalid function or a symbol with no function | |
2026 | definition. | |
2027 | ||
2028 | Interactively callable functions include strings and vectors (treated | |
2029 | as keyboard macros), lambda-expressions that contain a top-level call | |
2030 | to `interactive', autoload definitions made by `autoload' with non-nil | |
2031 | fourth argument, and some of the built-in functions of Lisp. | |
2032 | ||
e72706be RS |
2033 | Also, a symbol satisfies `commandp' if its function definition does so. |
2034 | ||
2035 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2036 | then strings and vectors are not accepted. */) |
5842a27b | 2037 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
2038 | { |
2039 | register Lisp_Object fun; | |
2040 | register Lisp_Object funcar; | |
52b71f49 | 2041 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2042 | |
2043 | fun = function; | |
2044 | ||
52b71f49 SM |
2045 | fun = indirect_function (fun); /* Check cycles. */ |
2046 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2047 | return Qnil; |
db9f0278 | 2048 | |
52b71f49 SM |
2049 | /* Check an `interactive-form' property if present, analogous to the |
2050 | function-documentation property. */ | |
2051 | fun = function; | |
2052 | while (SYMBOLP (fun)) | |
2053 | { | |
2b9aa051 | 2054 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
2055 | if (!NILP (tmp)) |
2056 | if_prop = Qt; | |
2057 | fun = Fsymbol_function (fun); | |
2058 | } | |
2059 | ||
db9f0278 JB |
2060 | /* Emacs primitives are interactive if their DEFUN specifies an |
2061 | interactive spec. */ | |
90165123 | 2062 | if (SUBRP (fun)) |
04724b69 | 2063 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2064 | |
2065 | /* Bytecode objects are interactive if they are long enough to | |
2066 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2067 | where the interactive spec is stored. */ | |
90165123 | 2068 | else if (COMPILEDP (fun)) |
845975f5 | 2069 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2070 | ? Qt : if_prop); |
db9f0278 JB |
2071 | |
2072 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2073 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2074 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2075 | |
2076 | /* Lists may represent commands. */ | |
2077 | if (!CONSP (fun)) | |
2078 | return Qnil; | |
ed16fb98 | 2079 | funcar = XCAR (fun); |
b38b1ec0 | 2080 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
2081 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
2082 | ? Qt : if_prop); | |
23aba0ea | 2083 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 2084 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 2085 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 2086 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2087 | else |
2088 | return Qnil; | |
2089 | } | |
2090 | ||
db9f0278 | 2091 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
2092 | doc: /* Define FUNCTION to autoload from FILE. |
2093 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2094 | Third arg DOCSTRING is documentation for the function. | |
2095 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2096 | Fifth arg TYPE indicates the type of the object: | |
2097 | nil or omitted says FUNCTION is a function, | |
2098 | `keymap' says FUNCTION is really a keymap, and | |
2099 | `macro' or t says FUNCTION is really a macro. | |
2100 | Third through fifth args give info about the real definition. | |
2101 | They default to nil. | |
2102 | If FUNCTION is already defined other than as an autoload, | |
2103 | this does nothing and returns nil. */) | |
5842a27b | 2104 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 2105 | { |
b7826503 PJ |
2106 | CHECK_SYMBOL (function); |
2107 | CHECK_STRING (file); | |
db9f0278 | 2108 | |
f6d62986 | 2109 | /* If function is defined and not as an autoload, don't override. */ |
db9f0278 | 2110 | if (!EQ (XSYMBOL (function)->function, Qunbound) |
90165123 | 2111 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2112 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2113 | return Qnil; |
2114 | ||
7973e637 SM |
2115 | if (NILP (Vpurify_flag)) |
2116 | /* Only add entries after dumping, because the ones before are | |
2117 | not useful and else we get loads of them from the loaddefs.el. */ | |
2118 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
905a9ed3 | 2119 | else |
a56eaaef | 2120 | /* We don't want the docstring in purespace (instead, |
d6d23852 SM |
2121 | Snarf-documentation should (hopefully) overwrite it). |
2122 | We used to use 0 here, but that leads to accidental sharing in | |
2123 | purecopy's hash-consing, so we use a (hopefully) unique integer | |
2124 | instead. */ | |
51639eac | 2125 | docstring = make_number (XPNTR (function)); |
a56eaaef DN |
2126 | return Ffset (function, |
2127 | Fpurecopy (list5 (Qautoload, file, docstring, | |
2128 | interactive, type))); | |
db9f0278 JB |
2129 | } |
2130 | ||
2131 | Lisp_Object | |
d3da34e0 | 2132 | un_autoload (Lisp_Object oldqueue) |
db9f0278 JB |
2133 | { |
2134 | register Lisp_Object queue, first, second; | |
2135 | ||
2136 | /* Queue to unwind is current value of Vautoload_queue. | |
2137 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2138 | queue = Vautoload_queue; | |
2139 | Vautoload_queue = oldqueue; | |
2140 | while (CONSP (queue)) | |
2141 | { | |
e509f168 | 2142 | first = XCAR (queue); |
db9f0278 JB |
2143 | second = Fcdr (first); |
2144 | first = Fcar (first); | |
47b82df9 RS |
2145 | if (EQ (first, make_number (0))) |
2146 | Vfeatures = second; | |
db9f0278 JB |
2147 | else |
2148 | Ffset (first, second); | |
e509f168 | 2149 | queue = XCDR (queue); |
db9f0278 JB |
2150 | } |
2151 | return Qnil; | |
2152 | } | |
2153 | ||
ca20916b RS |
2154 | /* Load an autoloaded function. |
2155 | FUNNAME is the symbol which is the function's name. | |
2156 | FUNDEF is the autoload definition (a list). */ | |
2157 | ||
045ba794 | 2158 | void |
d3da34e0 | 2159 | do_autoload (Lisp_Object fundef, Lisp_Object funname) |
db9f0278 | 2160 | { |
aed13378 | 2161 | int count = SPECPDL_INDEX (); |
d945992e | 2162 | Lisp_Object fun; |
ca20916b | 2163 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2164 | |
aea6173f RS |
2165 | /* This is to make sure that loadup.el gives a clear picture |
2166 | of what files are preloaded and when. */ | |
ab4db096 RS |
2167 | if (! NILP (Vpurify_flag)) |
2168 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2169 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2170 | |
db9f0278 | 2171 | fun = funname; |
b7826503 | 2172 | CHECK_SYMBOL (funname); |
ca20916b | 2173 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2174 | |
f87740dc | 2175 | /* Preserve the match data. */ |
89f2614d | 2176 | record_unwind_save_match_data (); |
177c0ea7 | 2177 | |
a04ee161 RS |
2178 | /* If autoloading gets an error (which includes the error of failing |
2179 | to define the function being called), we use Vautoload_queue | |
2180 | to undo function definitions and `provide' calls made by | |
2181 | the function. We do this in the specific case of autoloading | |
2182 | because autoloading is not an explicit request "load this file", | |
2183 | but rather a request to "call this function". | |
d3da34e0 | 2184 | |
a04ee161 | 2185 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
2186 | record_unwind_protect (un_autoload, Vautoload_queue); |
2187 | Vautoload_queue = Qt; | |
7351b242 | 2188 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2189 | |
db9f0278 JB |
2190 | /* Once loading finishes, don't undo it. */ |
2191 | Vautoload_queue = Qt; | |
2192 | unbind_to (count, Qnil); | |
2193 | ||
a7f96a35 | 2194 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2195 | |
76c2b0cc | 2196 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2197 | error ("Autoloading failed to define function %s", |
d5db4077 | 2198 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2199 | UNGCPRO; |
db9f0278 | 2200 | } |
4c576a83 | 2201 | |
db9f0278 | 2202 | \f |
a7ca3326 | 2203 | DEFUN ("eval", Feval, Seval, 1, 2, 0, |
a0ee6f27 SM |
2204 | doc: /* Evaluate FORM and return its value. |
2205 | If LEXICAL is t, evaluate using lexical scoping. */) | |
2206 | (Lisp_Object form, Lisp_Object lexical) | |
defb1411 SM |
2207 | { |
2208 | int count = SPECPDL_INDEX (); | |
a0ee6f27 SM |
2209 | specbind (Qinternal_interpreter_environment, |
2210 | NILP (lexical) ? Qnil : Fcons (Qt, Qnil)); | |
defb1411 SM |
2211 | return unbind_to (count, eval_sub (form)); |
2212 | } | |
2213 | ||
2214 | /* Eval a sub-expression of the current expression (i.e. in the same | |
2215 | lexical scope). */ | |
2216 | Lisp_Object | |
2217 | eval_sub (Lisp_Object form) | |
db9f0278 JB |
2218 | { |
2219 | Lisp_Object fun, val, original_fun, original_args; | |
2220 | Lisp_Object funcar; | |
2221 | struct backtrace backtrace; | |
2222 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2223 | ||
df470e3b | 2224 | if (handling_signal) |
48f8dfa3 | 2225 | abort (); |
177c0ea7 | 2226 | |
90165123 | 2227 | if (SYMBOLP (form)) |
b9598260 | 2228 | { |
f07a954e SM |
2229 | /* Look up its binding in the lexical environment. |
2230 | We do not pay attention to the declared_special flag here, since we | |
2231 | already did that when let-binding the variable. */ | |
2232 | Lisp_Object lex_binding | |
2233 | = !NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
2234 | ? Fassq (form, Vinternal_interpreter_environment) | |
2235 | : Qnil; | |
2236 | if (CONSP (lex_binding)) | |
2237 | return XCDR (lex_binding); | |
2238 | else | |
2239 | return Fsymbol_value (form); | |
b9598260 SM |
2240 | } |
2241 | ||
db9f0278 JB |
2242 | if (!CONSP (form)) |
2243 | return form; | |
2244 | ||
2245 | QUIT; | |
ee830945 RS |
2246 | if ((consing_since_gc > gc_cons_threshold |
2247 | && consing_since_gc > gc_relative_threshold) | |
2248 | || | |
2249 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2250 | { |
2251 | GCPRO1 (form); | |
2252 | Fgarbage_collect (); | |
2253 | UNGCPRO; | |
2254 | } | |
2255 | ||
2256 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2257 | { | |
2258 | if (max_lisp_eval_depth < 100) | |
2259 | max_lisp_eval_depth = 100; | |
2260 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2261 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2262 | } |
2263 | ||
2264 | original_fun = Fcar (form); | |
2265 | original_args = Fcdr (form); | |
2266 | ||
2267 | backtrace.next = backtrace_list; | |
2268 | backtrace_list = &backtrace; | |
f6d62986 | 2269 | backtrace.function = &original_fun; /* This also protects them from gc. */ |
db9f0278 JB |
2270 | backtrace.args = &original_args; |
2271 | backtrace.nargs = UNEVALLED; | |
db9f0278 JB |
2272 | backtrace.debug_on_exit = 0; |
2273 | ||
2274 | if (debug_on_next_call) | |
2275 | do_debug_on_call (Qt); | |
2276 | ||
2277 | /* At this point, only original_fun and original_args | |
f6d62986 | 2278 | have values that will be used below. */ |
db9f0278 | 2279 | retry: |
8788120f KS |
2280 | |
2281 | /* Optimize for no indirection. */ | |
2282 | fun = original_fun; | |
2283 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2284 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2285 | fun = indirect_function (fun); | |
db9f0278 | 2286 | |
90165123 | 2287 | if (SUBRP (fun)) |
db9f0278 JB |
2288 | { |
2289 | Lisp_Object numargs; | |
166c822d | 2290 | Lisp_Object argvals[8]; |
db9f0278 JB |
2291 | Lisp_Object args_left; |
2292 | register int i, maxargs; | |
2293 | ||
2294 | args_left = original_args; | |
2295 | numargs = Flength (args_left); | |
2296 | ||
c1788fbc RS |
2297 | CHECK_CONS_LIST (); |
2298 | ||
f6d62986 SM |
2299 | if (XINT (numargs) < XSUBR (fun)->min_args |
2300 | || (XSUBR (fun)->max_args >= 0 | |
2301 | && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2302 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2303 | |
ef1b0ba7 | 2304 | else if (XSUBR (fun)->max_args == UNEVALLED) |
bbc6b304 | 2305 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
ef1b0ba7 | 2306 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 | 2307 | { |
f6d62986 | 2308 | /* Pass a vector of evaluated arguments. */ |
db9f0278 | 2309 | Lisp_Object *vals; |
f66c7cf8 | 2310 | ptrdiff_t argnum = 0; |
3a7a9129 | 2311 | USE_SAFE_ALLOCA; |
db9f0278 | 2312 | |
b72e0717 | 2313 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2314 | |
2315 | GCPRO3 (args_left, fun, fun); | |
2316 | gcpro3.var = vals; | |
2317 | gcpro3.nvars = 0; | |
2318 | ||
265a9e55 | 2319 | while (!NILP (args_left)) |
db9f0278 | 2320 | { |
defb1411 | 2321 | vals[argnum++] = eval_sub (Fcar (args_left)); |
db9f0278 JB |
2322 | args_left = Fcdr (args_left); |
2323 | gcpro3.nvars = argnum; | |
2324 | } | |
db9f0278 JB |
2325 | |
2326 | backtrace.args = vals; | |
2327 | backtrace.nargs = XINT (numargs); | |
2328 | ||
d5273788 | 2329 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2330 | UNGCPRO; |
3a7a9129 | 2331 | SAFE_FREE (); |
db9f0278 | 2332 | } |
ef1b0ba7 | 2333 | else |
db9f0278 | 2334 | { |
ef1b0ba7 SM |
2335 | GCPRO3 (args_left, fun, fun); |
2336 | gcpro3.var = argvals; | |
2337 | gcpro3.nvars = 0; | |
db9f0278 | 2338 | |
ef1b0ba7 SM |
2339 | maxargs = XSUBR (fun)->max_args; |
2340 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2341 | { | |
a0ee6f27 | 2342 | argvals[i] = eval_sub (Fcar (args_left)); |
ef1b0ba7 SM |
2343 | gcpro3.nvars = ++i; |
2344 | } | |
db9f0278 | 2345 | |
ef1b0ba7 | 2346 | UNGCPRO; |
db9f0278 | 2347 | |
ef1b0ba7 SM |
2348 | backtrace.args = argvals; |
2349 | backtrace.nargs = XINT (numargs); | |
2350 | ||
2351 | switch (i) | |
2352 | { | |
2353 | case 0: | |
2354 | val = (XSUBR (fun)->function.a0 ()); | |
2355 | break; | |
2356 | case 1: | |
2357 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2358 | break; | |
2359 | case 2: | |
2360 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2361 | break; | |
2362 | case 3: | |
2363 | val = (XSUBR (fun)->function.a3 | |
2364 | (argvals[0], argvals[1], argvals[2])); | |
2365 | break; | |
2366 | case 4: | |
2367 | val = (XSUBR (fun)->function.a4 | |
2368 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2369 | break; | |
2370 | case 5: | |
2371 | val = (XSUBR (fun)->function.a5 | |
2372 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2373 | argvals[4])); | |
2374 | break; | |
2375 | case 6: | |
2376 | val = (XSUBR (fun)->function.a6 | |
2377 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2378 | argvals[4], argvals[5])); | |
2379 | break; | |
2380 | case 7: | |
2381 | val = (XSUBR (fun)->function.a7 | |
2382 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2383 | argvals[4], argvals[5], argvals[6])); | |
2384 | break; | |
2385 | ||
2386 | case 8: | |
2387 | val = (XSUBR (fun)->function.a8 | |
2388 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2389 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2390 | break; | |
2391 | ||
2392 | default: | |
2393 | /* Someone has created a subr that takes more arguments than | |
2394 | is supported by this code. We need to either rewrite the | |
2395 | subr to use a different argument protocol, or add more | |
2396 | cases to this switch. */ | |
2397 | abort (); | |
2398 | } | |
db9f0278 JB |
2399 | } |
2400 | } | |
ef1b0ba7 | 2401 | else if (COMPILEDP (fun)) |
defb1411 | 2402 | val = apply_lambda (fun, original_args); |
db9f0278 JB |
2403 | else |
2404 | { | |
8788120f | 2405 | if (EQ (fun, Qunbound)) |
734d55a2 | 2406 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2407 | if (!CONSP (fun)) |
734d55a2 KS |
2408 | xsignal1 (Qinvalid_function, original_fun); |
2409 | funcar = XCAR (fun); | |
90165123 | 2410 | if (!SYMBOLP (funcar)) |
734d55a2 | 2411 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2412 | if (EQ (funcar, Qautoload)) |
2413 | { | |
2414 | do_autoload (fun, original_fun); | |
2415 | goto retry; | |
2416 | } | |
2417 | if (EQ (funcar, Qmacro)) | |
defb1411 SM |
2418 | val = eval_sub (apply1 (Fcdr (fun), original_args)); |
2419 | else if (EQ (funcar, Qlambda) | |
2420 | || EQ (funcar, Qclosure)) | |
2421 | val = apply_lambda (fun, original_args); | |
db9f0278 | 2422 | else |
734d55a2 | 2423 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2424 | } |
c1788fbc RS |
2425 | CHECK_CONS_LIST (); |
2426 | ||
db9f0278 JB |
2427 | lisp_eval_depth--; |
2428 | if (backtrace.debug_on_exit) | |
2429 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2430 | backtrace_list = backtrace.next; | |
824eb35e | 2431 | |
db9f0278 JB |
2432 | return val; |
2433 | } | |
2434 | \f | |
a7ca3326 | 2435 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, |
9dbc9081 PJ |
2436 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2437 | Then return the value FUNCTION returns. | |
2438 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2439 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2440 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2441 | { |
f66c7cf8 | 2442 | ptrdiff_t i, numargs; |
db9f0278 JB |
2443 | register Lisp_Object spread_arg; |
2444 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2445 | Lisp_Object fun, retval; |
96d44c64 | 2446 | struct gcpro gcpro1; |
3a7a9129 | 2447 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2448 | |
2449 | fun = args [0]; | |
2450 | funcall_args = 0; | |
2451 | spread_arg = args [nargs - 1]; | |
b7826503 | 2452 | CHECK_LIST (spread_arg); |
177c0ea7 | 2453 | |
db9f0278 JB |
2454 | numargs = XINT (Flength (spread_arg)); |
2455 | ||
2456 | if (numargs == 0) | |
2457 | return Ffuncall (nargs - 1, args); | |
2458 | else if (numargs == 1) | |
2459 | { | |
03699b14 | 2460 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2461 | return Ffuncall (nargs, args); |
2462 | } | |
2463 | ||
a6e3fa71 | 2464 | numargs += nargs - 2; |
db9f0278 | 2465 | |
8788120f KS |
2466 | /* Optimize for no indirection. */ |
2467 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2468 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2469 | fun = indirect_function (fun); | |
ffd56f97 | 2470 | if (EQ (fun, Qunbound)) |
db9f0278 | 2471 | { |
f6d62986 | 2472 | /* Let funcall get the error. */ |
ffd56f97 JB |
2473 | fun = args[0]; |
2474 | goto funcall; | |
db9f0278 JB |
2475 | } |
2476 | ||
90165123 | 2477 | if (SUBRP (fun)) |
db9f0278 JB |
2478 | { |
2479 | if (numargs < XSUBR (fun)->min_args | |
2480 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
f6d62986 | 2481 | goto funcall; /* Let funcall get the error. */ |
c5101a77 | 2482 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2483 | { |
2484 | /* Avoid making funcall cons up a yet another new vector of arguments | |
f6d62986 | 2485 | by explicitly supplying nil's for optional values. */ |
b72e0717 | 2486 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2487 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2488 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2489 | GCPRO1 (*funcall_args); |
2490 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2491 | } |
2492 | } | |
2493 | funcall: | |
2494 | /* We add 1 to numargs because funcall_args includes the | |
2495 | function itself as well as its arguments. */ | |
2496 | if (!funcall_args) | |
a6e3fa71 | 2497 | { |
b72e0717 | 2498 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2499 | GCPRO1 (*funcall_args); |
2500 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2501 | } |
2502 | ||
72af86bd | 2503 | memcpy (funcall_args, args, nargs * sizeof (Lisp_Object)); |
db9f0278 JB |
2504 | /* Spread the last arg we got. Its first element goes in |
2505 | the slot that it used to occupy, hence this value of I. */ | |
2506 | i = nargs - 1; | |
265a9e55 | 2507 | while (!NILP (spread_arg)) |
db9f0278 | 2508 | { |
03699b14 KR |
2509 | funcall_args [i++] = XCAR (spread_arg); |
2510 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2511 | } |
a6e3fa71 | 2512 | |
96d44c64 | 2513 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2514 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2515 | UNGCPRO; | |
2516 | SAFE_FREE (); | |
2517 | ||
2518 | return retval; | |
db9f0278 JB |
2519 | } |
2520 | \f | |
ff936e53 SM |
2521 | /* Run hook variables in various ways. */ |
2522 | ||
f6d62986 | 2523 | static Lisp_Object |
f66c7cf8 | 2524 | funcall_nil (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2525 | { |
2526 | Ffuncall (nargs, args); | |
2527 | return Qnil; | |
2528 | } | |
ff936e53 | 2529 | |
a7ca3326 | 2530 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2531 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2532 | Each argument should be a symbol, a hook variable. |
2533 | These symbols are processed in the order specified. | |
2534 | If a hook symbol has a non-nil value, that value may be a function | |
2535 | or a list of functions to be called to run the hook. | |
2536 | If the value is a function, it is called with no arguments. | |
2537 | If it is a list, the elements are called, in order, with no arguments. | |
2538 | ||
9f685258 LK |
2539 | Major modes should not use this function directly to run their mode |
2540 | hook; they should use `run-mode-hooks' instead. | |
2541 | ||
72e85d5d RS |
2542 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2543 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2544 | usage: (run-hooks &rest HOOKS) */) |
f66c7cf8 | 2545 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 SM |
2546 | { |
2547 | Lisp_Object hook[1]; | |
f66c7cf8 | 2548 | ptrdiff_t i; |
ff936e53 SM |
2549 | |
2550 | for (i = 0; i < nargs; i++) | |
2551 | { | |
2552 | hook[0] = args[i]; | |
f6d62986 | 2553 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
2554 | } |
2555 | ||
2556 | return Qnil; | |
2557 | } | |
177c0ea7 | 2558 | |
a7ca3326 | 2559 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2560 | Srun_hook_with_args, 1, MANY, 0, |
2561 | doc: /* Run HOOK with the specified arguments ARGS. | |
2562 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2563 | value, that value may be a function or a list of functions to be | |
2564 | called to run the hook. If the value is a function, it is called with | |
2565 | the given arguments and its return value is returned. If it is a list | |
2566 | of functions, those functions are called, in order, | |
2567 | with the given arguments ARGS. | |
d5e2c90c | 2568 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2569 | as that may change. |
2570 | ||
72e85d5d RS |
2571 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2572 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2573 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
f66c7cf8 | 2574 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2575 | { |
f6d62986 | 2576 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
2577 | } |
2578 | ||
a0d76c27 | 2579 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2580 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2581 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2582 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2583 | value, that value may be a function or a list of functions to be | |
2584 | called to run the hook. If the value is a function, it is called with | |
2585 | the given arguments and its return value is returned. | |
2586 | If it is a list of functions, those functions are called, in order, | |
2587 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2588 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2589 | However, if they all return nil, we return nil. |
9dbc9081 | 2590 | |
72e85d5d RS |
2591 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2592 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2593 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
f66c7cf8 | 2594 | (ptrdiff_t nargs, Lisp_Object *args) |
b0b667cb | 2595 | { |
f6d62986 SM |
2596 | return run_hook_with_args (nargs, args, Ffuncall); |
2597 | } | |
2598 | ||
2599 | static Lisp_Object | |
f66c7cf8 | 2600 | funcall_not (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2601 | { |
2602 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
2603 | } |
2604 | ||
a7ca3326 | 2605 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2606 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2607 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2608 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2609 | value, that value may be a function or a list of functions to be | |
2610 | called to run the hook. If the value is a function, it is called with | |
2611 | the given arguments and its return value is returned. | |
2612 | If it is a list of functions, those functions are called, in order, | |
2613 | with the given arguments ARGS, until one of them returns nil. | |
2614 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2615 | |
72e85d5d RS |
2616 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2617 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2618 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
f66c7cf8 | 2619 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2620 | { |
f6d62986 | 2621 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
2622 | } |
2623 | ||
f6d62986 | 2624 | static Lisp_Object |
f66c7cf8 | 2625 | run_hook_wrapped_funcall (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2626 | { |
2627 | Lisp_Object tmp = args[0], ret; | |
2628 | args[0] = args[1]; | |
2629 | args[1] = tmp; | |
2630 | ret = Ffuncall (nargs, args); | |
2631 | args[1] = args[0]; | |
2632 | args[0] = tmp; | |
2633 | return ret; | |
2634 | } | |
2635 | ||
2636 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
2637 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
2638 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
2639 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
2640 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
2641 | aborts and returns that value. | |
2642 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
f66c7cf8 | 2643 | (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2644 | { |
2645 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
2646 | } | |
ff936e53 | 2647 | |
c933ea05 RS |
2648 | /* ARGS[0] should be a hook symbol. |
2649 | Call each of the functions in the hook value, passing each of them | |
2650 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 2651 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
2652 | The caller (or its caller, etc) must gcpro all of ARGS, |
2653 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2654 | ||
f6d62986 | 2655 | Lisp_Object |
f66c7cf8 PE |
2656 | run_hook_with_args (ptrdiff_t nargs, Lisp_Object *args, |
2657 | Lisp_Object (*funcall) (ptrdiff_t nargs, Lisp_Object *args)) | |
ff936e53 | 2658 | { |
f6d62986 | 2659 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 2660 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2661 | |
f029ca5f RS |
2662 | /* If we are dying or still initializing, |
2663 | don't do anything--it would probably crash if we tried. */ | |
2664 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2665 | return Qnil; |
f029ca5f | 2666 | |
b0b667cb | 2667 | sym = args[0]; |
aa681b51 | 2668 | val = find_symbol_value (sym); |
ff936e53 | 2669 | |
b0b667cb | 2670 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2671 | return ret; |
03699b14 | 2672 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2673 | { |
2674 | args[0] = val; | |
f6d62986 | 2675 | return funcall (nargs, args); |
b0b667cb KH |
2676 | } |
2677 | else | |
2678 | { | |
1faed8ae PE |
2679 | Lisp_Object global_vals = Qnil; |
2680 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2681 | |
ff936e53 | 2682 | for (; |
f6d62986 | 2683 | CONSP (val) && NILP (ret); |
03699b14 | 2684 | val = XCDR (val)) |
b0b667cb | 2685 | { |
03699b14 | 2686 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2687 | { |
2688 | /* t indicates this hook has a local binding; | |
2689 | it means to run the global binding too. */ | |
1faed8ae PE |
2690 | global_vals = Fdefault_value (sym); |
2691 | if (NILP (global_vals)) continue; | |
b0b667cb | 2692 | |
1faed8ae | 2693 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2694 | { |
1faed8ae | 2695 | args[0] = global_vals; |
f6d62986 | 2696 | ret = funcall (nargs, args); |
8932b1c2 CY |
2697 | } |
2698 | else | |
2699 | { | |
2700 | for (; | |
f6d62986 | 2701 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 2702 | global_vals = XCDR (global_vals)) |
8932b1c2 | 2703 | { |
1faed8ae | 2704 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2705 | /* In a global value, t should not occur. If it does, we |
2706 | must ignore it to avoid an endless loop. */ | |
2707 | if (!EQ (args[0], Qt)) | |
f6d62986 | 2708 | ret = funcall (nargs, args); |
8932b1c2 | 2709 | } |
b0b667cb KH |
2710 | } |
2711 | } | |
2712 | else | |
2713 | { | |
03699b14 | 2714 | args[0] = XCAR (val); |
f6d62986 | 2715 | ret = funcall (nargs, args); |
b0b667cb KH |
2716 | } |
2717 | } | |
cb9d21f8 RS |
2718 | |
2719 | UNGCPRO; | |
ff936e53 | 2720 | return ret; |
b0b667cb KH |
2721 | } |
2722 | } | |
c933ea05 | 2723 | |
7d48558f RS |
2724 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2725 | ||
2726 | void | |
d3da34e0 | 2727 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2728 | { |
2729 | Lisp_Object temp[3]; | |
2730 | temp[0] = hook; | |
2731 | temp[1] = arg1; | |
2732 | temp[2] = arg2; | |
2733 | ||
2734 | Frun_hook_with_args (3, temp); | |
2735 | } | |
ff936e53 | 2736 | \f |
f6d62986 | 2737 | /* Apply fn to arg. */ |
db9f0278 | 2738 | Lisp_Object |
d3da34e0 | 2739 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2740 | { |
a6e3fa71 JB |
2741 | struct gcpro gcpro1; |
2742 | ||
2743 | GCPRO1 (fn); | |
265a9e55 | 2744 | if (NILP (arg)) |
a6e3fa71 JB |
2745 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2746 | gcpro1.nvars = 2; | |
db9f0278 JB |
2747 | { |
2748 | Lisp_Object args[2]; | |
2749 | args[0] = fn; | |
2750 | args[1] = arg; | |
a6e3fa71 JB |
2751 | gcpro1.var = args; |
2752 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2753 | } |
db9f0278 JB |
2754 | } |
2755 | ||
f6d62986 | 2756 | /* Call function fn on no arguments. */ |
db9f0278 | 2757 | Lisp_Object |
d3da34e0 | 2758 | call0 (Lisp_Object fn) |
db9f0278 | 2759 | { |
a6e3fa71 JB |
2760 | struct gcpro gcpro1; |
2761 | ||
2762 | GCPRO1 (fn); | |
2763 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2764 | } |
2765 | ||
f6d62986 | 2766 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
2767 | /* ARGSUSED */ |
2768 | Lisp_Object | |
d3da34e0 | 2769 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2770 | { |
a6e3fa71 | 2771 | struct gcpro gcpro1; |
177c0ea7 | 2772 | Lisp_Object args[2]; |
a6e3fa71 | 2773 | |
db9f0278 | 2774 | args[0] = fn; |
15285f9f | 2775 | args[1] = arg1; |
a6e3fa71 JB |
2776 | GCPRO1 (args[0]); |
2777 | gcpro1.nvars = 2; | |
2778 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2779 | } |
2780 | ||
f6d62986 | 2781 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
2782 | /* ARGSUSED */ |
2783 | Lisp_Object | |
d3da34e0 | 2784 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2785 | { |
a6e3fa71 | 2786 | struct gcpro gcpro1; |
db9f0278 JB |
2787 | Lisp_Object args[3]; |
2788 | args[0] = fn; | |
15285f9f RS |
2789 | args[1] = arg1; |
2790 | args[2] = arg2; | |
a6e3fa71 JB |
2791 | GCPRO1 (args[0]); |
2792 | gcpro1.nvars = 3; | |
2793 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2794 | } |
2795 | ||
f6d62986 | 2796 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
2797 | /* ARGSUSED */ |
2798 | Lisp_Object | |
d3da34e0 | 2799 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2800 | { |
a6e3fa71 | 2801 | struct gcpro gcpro1; |
db9f0278 JB |
2802 | Lisp_Object args[4]; |
2803 | args[0] = fn; | |
15285f9f RS |
2804 | args[1] = arg1; |
2805 | args[2] = arg2; | |
2806 | args[3] = arg3; | |
a6e3fa71 JB |
2807 | GCPRO1 (args[0]); |
2808 | gcpro1.nvars = 4; | |
2809 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2810 | } |
2811 | ||
f6d62986 | 2812 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
2813 | /* ARGSUSED */ |
2814 | Lisp_Object | |
d3da34e0 JB |
2815 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2816 | Lisp_Object arg4) | |
a5a44b91 JB |
2817 | { |
2818 | struct gcpro gcpro1; | |
a5a44b91 JB |
2819 | Lisp_Object args[5]; |
2820 | args[0] = fn; | |
15285f9f RS |
2821 | args[1] = arg1; |
2822 | args[2] = arg2; | |
2823 | args[3] = arg3; | |
2824 | args[4] = arg4; | |
a5a44b91 JB |
2825 | GCPRO1 (args[0]); |
2826 | gcpro1.nvars = 5; | |
2827 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2828 | } |
2829 | ||
f6d62986 | 2830 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
2831 | /* ARGSUSED */ |
2832 | Lisp_Object | |
d3da34e0 JB |
2833 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2834 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2835 | { |
2836 | struct gcpro gcpro1; | |
15285f9f RS |
2837 | Lisp_Object args[6]; |
2838 | args[0] = fn; | |
2839 | args[1] = arg1; | |
2840 | args[2] = arg2; | |
2841 | args[3] = arg3; | |
2842 | args[4] = arg4; | |
2843 | args[5] = arg5; | |
2844 | GCPRO1 (args[0]); | |
2845 | gcpro1.nvars = 6; | |
2846 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2847 | } |
2848 | ||
f6d62986 | 2849 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
2850 | /* ARGSUSED */ |
2851 | Lisp_Object | |
d3da34e0 JB |
2852 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2853 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2854 | { |
2855 | struct gcpro gcpro1; | |
15285f9f RS |
2856 | Lisp_Object args[7]; |
2857 | args[0] = fn; | |
2858 | args[1] = arg1; | |
2859 | args[2] = arg2; | |
2860 | args[3] = arg3; | |
2861 | args[4] = arg4; | |
2862 | args[5] = arg5; | |
2863 | args[6] = arg6; | |
2864 | GCPRO1 (args[0]); | |
2865 | gcpro1.nvars = 7; | |
2866 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2867 | } |
2868 | ||
f6d62986 | 2869 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
2870 | /* ARGSUSED */ |
2871 | Lisp_Object | |
d3da34e0 JB |
2872 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2873 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2874 | { |
2875 | struct gcpro gcpro1; | |
574c05e2 KK |
2876 | Lisp_Object args[8]; |
2877 | args[0] = fn; | |
2878 | args[1] = arg1; | |
2879 | args[2] = arg2; | |
2880 | args[3] = arg3; | |
2881 | args[4] = arg4; | |
2882 | args[5] = arg5; | |
2883 | args[6] = arg6; | |
2884 | args[7] = arg7; | |
2885 | GCPRO1 (args[0]); | |
2886 | gcpro1.nvars = 8; | |
2887 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2888 | } |
2889 | ||
6c2ef893 RS |
2890 | /* The caller should GCPRO all the elements of ARGS. */ |
2891 | ||
a7ca3326 | 2892 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 2893 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 2894 | (Lisp_Object object) |
b9598260 SM |
2895 | { |
2896 | if (SYMBOLP (object) && !NILP (Ffboundp (object))) | |
2897 | { | |
ba83908c | 2898 | object = Findirect_function (object, Qt); |
b9598260 SM |
2899 | |
2900 | if (CONSP (object) && EQ (XCAR (object), Qautoload)) | |
2901 | { | |
2902 | /* Autoloaded symbols are functions, except if they load | |
2903 | macros or keymaps. */ | |
2904 | int i; | |
2905 | for (i = 0; i < 4 && CONSP (object); i++) | |
2906 | object = XCDR (object); | |
2907 | ||
2908 | return (CONSP (object) && !NILP (XCAR (object))) ? Qnil : Qt; | |
2909 | } | |
2910 | } | |
2911 | ||
2912 | if (SUBRP (object)) | |
3c3ddb98 | 2913 | return (XSUBR (object)->max_args != UNEVALLED) ? Qt : Qnil; |
876c194c | 2914 | else if (COMPILEDP (object)) |
b9598260 SM |
2915 | return Qt; |
2916 | else if (CONSP (object)) | |
2917 | { | |
2918 | Lisp_Object car = XCAR (object); | |
2919 | return (EQ (car, Qlambda) || EQ (car, Qclosure)) ? Qt : Qnil; | |
2920 | } | |
2921 | else | |
2922 | return Qnil; | |
2923 | } | |
2924 | ||
a7ca3326 | 2925 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2926 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2927 | Return the value that function returns. | |
2928 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2929 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2930 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2931 | { |
8788120f | 2932 | Lisp_Object fun, original_fun; |
db9f0278 | 2933 | Lisp_Object funcar; |
f66c7cf8 | 2934 | ptrdiff_t numargs = nargs - 1; |
db9f0278 JB |
2935 | Lisp_Object lisp_numargs; |
2936 | Lisp_Object val; | |
2937 | struct backtrace backtrace; | |
2938 | register Lisp_Object *internal_args; | |
f66c7cf8 | 2939 | ptrdiff_t i; |
db9f0278 JB |
2940 | |
2941 | QUIT; | |
ee830945 RS |
2942 | if ((consing_since_gc > gc_cons_threshold |
2943 | && consing_since_gc > gc_relative_threshold) | |
2944 | || | |
2945 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 2946 | Fgarbage_collect (); |
db9f0278 JB |
2947 | |
2948 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2949 | { | |
2950 | if (max_lisp_eval_depth < 100) | |
2951 | max_lisp_eval_depth = 100; | |
2952 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2953 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2954 | } |
2955 | ||
2956 | backtrace.next = backtrace_list; | |
2957 | backtrace_list = &backtrace; | |
2958 | backtrace.function = &args[0]; | |
2959 | backtrace.args = &args[1]; | |
2960 | backtrace.nargs = nargs - 1; | |
db9f0278 JB |
2961 | backtrace.debug_on_exit = 0; |
2962 | ||
2963 | if (debug_on_next_call) | |
2964 | do_debug_on_call (Qlambda); | |
2965 | ||
fff3ff9c KS |
2966 | CHECK_CONS_LIST (); |
2967 | ||
8788120f KS |
2968 | original_fun = args[0]; |
2969 | ||
db9f0278 JB |
2970 | retry: |
2971 | ||
8788120f KS |
2972 | /* Optimize for no indirection. */ |
2973 | fun = original_fun; | |
2974 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2975 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2976 | fun = indirect_function (fun); | |
db9f0278 | 2977 | |
90165123 | 2978 | if (SUBRP (fun)) |
db9f0278 | 2979 | { |
ef1b0ba7 | 2980 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
2981 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
2982 | { | |
a631e24c | 2983 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 2984 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
2985 | } |
2986 | ||
ef1b0ba7 | 2987 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 2988 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2989 | |
ef1b0ba7 SM |
2990 | else if (XSUBR (fun)->max_args == MANY) |
2991 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 2992 | else |
db9f0278 | 2993 | { |
ef1b0ba7 SM |
2994 | if (XSUBR (fun)->max_args > numargs) |
2995 | { | |
2996 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
2997 | memcpy (internal_args, args + 1, numargs * sizeof (Lisp_Object)); | |
2998 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
2999 | internal_args[i] = Qnil; | |
3000 | } | |
3001 | else | |
3002 | internal_args = args + 1; | |
3003 | switch (XSUBR (fun)->max_args) | |
3004 | { | |
3005 | case 0: | |
3006 | val = (XSUBR (fun)->function.a0 ()); | |
3007 | break; | |
3008 | case 1: | |
3009 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
3010 | break; | |
3011 | case 2: | |
3012 | val = (XSUBR (fun)->function.a2 | |
3013 | (internal_args[0], internal_args[1])); | |
3014 | break; | |
3015 | case 3: | |
3016 | val = (XSUBR (fun)->function.a3 | |
3017 | (internal_args[0], internal_args[1], internal_args[2])); | |
3018 | break; | |
3019 | case 4: | |
3020 | val = (XSUBR (fun)->function.a4 | |
3021 | (internal_args[0], internal_args[1], internal_args[2], | |
3022 | internal_args[3])); | |
3023 | break; | |
3024 | case 5: | |
3025 | val = (XSUBR (fun)->function.a5 | |
3026 | (internal_args[0], internal_args[1], internal_args[2], | |
3027 | internal_args[3], internal_args[4])); | |
3028 | break; | |
3029 | case 6: | |
3030 | val = (XSUBR (fun)->function.a6 | |
3031 | (internal_args[0], internal_args[1], internal_args[2], | |
3032 | internal_args[3], internal_args[4], internal_args[5])); | |
3033 | break; | |
3034 | case 7: | |
3035 | val = (XSUBR (fun)->function.a7 | |
3036 | (internal_args[0], internal_args[1], internal_args[2], | |
3037 | internal_args[3], internal_args[4], internal_args[5], | |
3038 | internal_args[6])); | |
3039 | break; | |
3040 | ||
3041 | case 8: | |
3042 | val = (XSUBR (fun)->function.a8 | |
3043 | (internal_args[0], internal_args[1], internal_args[2], | |
3044 | internal_args[3], internal_args[4], internal_args[5], | |
3045 | internal_args[6], internal_args[7])); | |
3046 | break; | |
3047 | ||
3048 | default: | |
3049 | ||
3050 | /* If a subr takes more than 8 arguments without using MANY | |
3051 | or UNEVALLED, we need to extend this function to support it. | |
3052 | Until this is done, there is no way to call the function. */ | |
3053 | abort (); | |
3054 | } | |
db9f0278 JB |
3055 | } |
3056 | } | |
ef1b0ba7 | 3057 | else if (COMPILEDP (fun)) |
db9f0278 JB |
3058 | val = funcall_lambda (fun, numargs, args + 1); |
3059 | else | |
3060 | { | |
8788120f | 3061 | if (EQ (fun, Qunbound)) |
734d55a2 | 3062 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 3063 | if (!CONSP (fun)) |
734d55a2 KS |
3064 | xsignal1 (Qinvalid_function, original_fun); |
3065 | funcar = XCAR (fun); | |
90165123 | 3066 | if (!SYMBOLP (funcar)) |
734d55a2 | 3067 | xsignal1 (Qinvalid_function, original_fun); |
defb1411 SM |
3068 | if (EQ (funcar, Qlambda) |
3069 | || EQ (funcar, Qclosure)) | |
db9f0278 | 3070 | val = funcall_lambda (fun, numargs, args + 1); |
db9f0278 JB |
3071 | else if (EQ (funcar, Qautoload)) |
3072 | { | |
8788120f | 3073 | do_autoload (fun, original_fun); |
fff3ff9c | 3074 | CHECK_CONS_LIST (); |
db9f0278 JB |
3075 | goto retry; |
3076 | } | |
3077 | else | |
734d55a2 | 3078 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 3079 | } |
c1788fbc | 3080 | CHECK_CONS_LIST (); |
db9f0278 JB |
3081 | lisp_eval_depth--; |
3082 | if (backtrace.debug_on_exit) | |
3083 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
3084 | backtrace_list = backtrace.next; | |
3085 | return val; | |
3086 | } | |
3087 | \f | |
2f7c71a1 | 3088 | static Lisp_Object |
defb1411 | 3089 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
3090 | { |
3091 | Lisp_Object args_left; | |
f66c7cf8 | 3092 | ptrdiff_t i, numargs; |
db9f0278 JB |
3093 | register Lisp_Object *arg_vector; |
3094 | struct gcpro gcpro1, gcpro2, gcpro3; | |
db9f0278 | 3095 | register Lisp_Object tem; |
3a7a9129 | 3096 | USE_SAFE_ALLOCA; |
db9f0278 | 3097 | |
f66c7cf8 | 3098 | numargs = XFASTINT (Flength (args)); |
c5101a77 | 3099 | SAFE_ALLOCA_LISP (arg_vector, numargs); |
db9f0278 JB |
3100 | args_left = args; |
3101 | ||
3102 | GCPRO3 (*arg_vector, args_left, fun); | |
3103 | gcpro1.nvars = 0; | |
3104 | ||
c5101a77 | 3105 | for (i = 0; i < numargs; ) |
db9f0278 JB |
3106 | { |
3107 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
defb1411 | 3108 | tem = eval_sub (tem); |
db9f0278 JB |
3109 | arg_vector[i++] = tem; |
3110 | gcpro1.nvars = i; | |
3111 | } | |
3112 | ||
3113 | UNGCPRO; | |
3114 | ||
f07a954e SM |
3115 | backtrace_list->args = arg_vector; |
3116 | backtrace_list->nargs = i; | |
c5101a77 | 3117 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
3118 | |
3119 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3120 | if (backtrace_list->debug_on_exit) | |
3121 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3122 | /* Don't do it again when we return to eval. */ | |
3123 | backtrace_list->debug_on_exit = 0; | |
3a7a9129 | 3124 | SAFE_FREE (); |
db9f0278 JB |
3125 | return tem; |
3126 | } | |
3127 | ||
3128 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
3129 | and return the result of evaluation. | |
3130 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3131 | ||
2901f1d1 | 3132 | static Lisp_Object |
f66c7cf8 | 3133 | funcall_lambda (Lisp_Object fun, ptrdiff_t nargs, |
c5101a77 | 3134 | register Lisp_Object *arg_vector) |
db9f0278 | 3135 | { |
defb1411 | 3136 | Lisp_Object val, syms_left, next, lexenv; |
aed13378 | 3137 | int count = SPECPDL_INDEX (); |
f66c7cf8 | 3138 | ptrdiff_t i; |
c5101a77 | 3139 | int optional, rest; |
db9f0278 | 3140 | |
90165123 | 3141 | if (CONSP (fun)) |
9ab90667 | 3142 | { |
defb1411 SM |
3143 | if (EQ (XCAR (fun), Qclosure)) |
3144 | { | |
3145 | fun = XCDR (fun); /* Drop `closure'. */ | |
3146 | lexenv = XCAR (fun); | |
23aba0ea | 3147 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
3148 | } |
3149 | else | |
3150 | lexenv = Qnil; | |
9ab90667 GM |
3151 | syms_left = XCDR (fun); |
3152 | if (CONSP (syms_left)) | |
3153 | syms_left = XCAR (syms_left); | |
3154 | else | |
734d55a2 | 3155 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3156 | } |
90165123 | 3157 | else if (COMPILEDP (fun)) |
defb1411 | 3158 | { |
798cb644 SM |
3159 | syms_left = AREF (fun, COMPILED_ARGLIST); |
3160 | if (INTEGERP (syms_left)) | |
876c194c SM |
3161 | /* A byte-code object with a non-nil `push args' slot means we |
3162 | shouldn't bind any arguments, instead just call the byte-code | |
3163 | interpreter directly; it will push arguments as necessary. | |
3164 | ||
9173deec | 3165 | Byte-code objects with either a non-existent, or a nil value for |
876c194c SM |
3166 | the `push args' slot (the default), have dynamically-bound |
3167 | arguments, and use the argument-binding code below instead (as do | |
3168 | all interpreted functions, even lexically bound ones). */ | |
3169 | { | |
3170 | /* If we have not actually read the bytecode string | |
3171 | and constants vector yet, fetch them from the file. */ | |
3172 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
3173 | Ffetch_bytecode (fun); | |
3174 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
3175 | AREF (fun, COMPILED_CONSTANTS), | |
3176 | AREF (fun, COMPILED_STACK_DEPTH), | |
798cb644 | 3177 | syms_left, |
876c194c SM |
3178 | nargs, arg_vector); |
3179 | } | |
defb1411 SM |
3180 | lexenv = Qnil; |
3181 | } | |
9ab90667 GM |
3182 | else |
3183 | abort (); | |
db9f0278 | 3184 | |
9ab90667 GM |
3185 | i = optional = rest = 0; |
3186 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3187 | { |
3188 | QUIT; | |
177c0ea7 | 3189 | |
9ab90667 | 3190 | next = XCAR (syms_left); |
8788120f | 3191 | if (!SYMBOLP (next)) |
734d55a2 | 3192 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3193 | |
db9f0278 JB |
3194 | if (EQ (next, Qand_rest)) |
3195 | rest = 1; | |
3196 | else if (EQ (next, Qand_optional)) | |
3197 | optional = 1; | |
db9f0278 | 3198 | else |
db9f0278 | 3199 | { |
e610eaca | 3200 | Lisp_Object arg; |
defb1411 SM |
3201 | if (rest) |
3202 | { | |
e610eaca | 3203 | arg = Flist (nargs - i, &arg_vector[i]); |
defb1411 SM |
3204 | i = nargs; |
3205 | } | |
3206 | else if (i < nargs) | |
e610eaca | 3207 | arg = arg_vector[i++]; |
b9598260 SM |
3208 | else if (!optional) |
3209 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3210 | else | |
e610eaca | 3211 | arg = Qnil; |
7200d79c | 3212 | |
b9598260 | 3213 | /* Bind the argument. */ |
876c194c | 3214 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 | 3215 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
e610eaca | 3216 | lexenv = Fcons (Fcons (next, arg), lexenv); |
b9598260 SM |
3217 | else |
3218 | /* Dynamically bind NEXT. */ | |
e610eaca | 3219 | specbind (next, arg); |
db9f0278 | 3220 | } |
db9f0278 JB |
3221 | } |
3222 | ||
9ab90667 | 3223 | if (!NILP (syms_left)) |
734d55a2 | 3224 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3225 | else if (i < nargs) |
734d55a2 | 3226 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3227 | |
b9598260 SM |
3228 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3229 | /* Instantiate a new lexical environment. */ | |
3230 | specbind (Qinternal_interpreter_environment, lexenv); | |
3231 | ||
90165123 | 3232 | if (CONSP (fun)) |
9ab90667 | 3233 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3234 | else |
ca248607 RS |
3235 | { |
3236 | /* If we have not actually read the bytecode string | |
3237 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3238 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3239 | Ffetch_bytecode (fun); |
b9598260 SM |
3240 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3241 | AREF (fun, COMPILED_CONSTANTS), | |
3242 | AREF (fun, COMPILED_STACK_DEPTH), | |
3243 | Qnil, 0, 0); | |
ca248607 | 3244 | } |
177c0ea7 | 3245 | |
db9f0278 JB |
3246 | return unbind_to (count, val); |
3247 | } | |
661c7d6e KH |
3248 | |
3249 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3250 | 1, 1, 0, |
3251 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3252 | (Lisp_Object object) |
661c7d6e KH |
3253 | { |
3254 | Lisp_Object tem; | |
3255 | ||
845975f5 | 3256 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3257 | { |
845975f5 | 3258 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3259 | if (!CONSP (tem)) |
845975f5 SM |
3260 | { |
3261 | tem = AREF (object, COMPILED_BYTECODE); | |
3262 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3263 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3264 | else |
3265 | error ("Invalid byte code"); | |
3266 | } | |
3ae565b3 SM |
3267 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3268 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3269 | } |
3270 | return object; | |
3271 | } | |
db9f0278 | 3272 | \f |
475545b5 | 3273 | static void |
d3da34e0 | 3274 | grow_specpdl (void) |
db9f0278 | 3275 | { |
aed13378 | 3276 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3277 | if (specpdl_size >= max_specpdl_size) |
3278 | { | |
3279 | if (max_specpdl_size < 400) | |
3280 | max_specpdl_size = 400; | |
3281 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3282 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3283 | } |
3284 | specpdl_size *= 2; | |
3285 | if (specpdl_size > max_specpdl_size) | |
3286 | specpdl_size = max_specpdl_size; | |
3287 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3288 | specpdl_ptr = specpdl + count; | |
3289 | } | |
3290 | ||
f6d62986 | 3291 | /* `specpdl_ptr->symbol' is a field which describes which variable is |
4e2db1fe SM |
3292 | let-bound, so it can be properly undone when we unbind_to. |
3293 | It can have the following two shapes: | |
3294 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3295 | a symbol that is not buffer-local (at least at the time | |
3296 | the let binding started). Note also that it should not be | |
3297 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3298 | to record V2 here). | |
3299 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3300 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3301 | which buffer is affected (or nil if the let-binding affects the | |
3302 | global value of the variable) and BUFFER tells us which buffer was | |
3303 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3304 | BUFFER did not yet have a buffer-local value). */ | |
3305 | ||
db9f0278 | 3306 | void |
d3da34e0 | 3307 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3308 | { |
ce5b453a SM |
3309 | struct Lisp_Symbol *sym; |
3310 | ||
3311 | eassert (!handling_signal); | |
db9f0278 | 3312 | |
b7826503 | 3313 | CHECK_SYMBOL (symbol); |
ce5b453a | 3314 | sym = XSYMBOL (symbol); |
db9f0278 JB |
3315 | if (specpdl_ptr == specpdl + specpdl_size) |
3316 | grow_specpdl (); | |
719177b3 | 3317 | |
ce5b453a SM |
3318 | start: |
3319 | switch (sym->redirect) | |
719177b3 | 3320 | { |
ce5b453a SM |
3321 | case SYMBOL_VARALIAS: |
3322 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3323 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3324 | /* The most common case is that of a non-constant symbol with a |
3325 | trivial value. Make that as fast as we can. */ | |
3326 | specpdl_ptr->symbol = symbol; | |
3327 | specpdl_ptr->old_value = SYMBOL_VAL (sym); | |
3328 | specpdl_ptr->func = NULL; | |
3329 | ++specpdl_ptr; | |
3330 | if (!sym->constant) | |
3331 | SET_SYMBOL_VAL (sym, value); | |
3332 | else | |
3333 | set_internal (symbol, value, Qnil, 1); | |
3334 | break; | |
4e2db1fe SM |
3335 | case SYMBOL_LOCALIZED: |
3336 | if (SYMBOL_BLV (sym)->frame_local) | |
3337 | error ("Frame-local vars cannot be let-bound"); | |
3338 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3339 | { |
3340 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3341 | specpdl_ptr->func = 0; | |
3342 | specpdl_ptr->old_value = ovalue; | |
3343 | ||
3344 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3345 | || (EQ (SYMBOL_BLV (sym)->where, | |
3346 | SYMBOL_BLV (sym)->frame_local ? | |
3347 | Fselected_frame () : Fcurrent_buffer ()))); | |
3348 | ||
3349 | if (sym->redirect == SYMBOL_LOCALIZED | |
3350 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3351 | { | |
3352 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3353 | ||
3354 | /* For a local variable, record both the symbol and which | |
3355 | buffer's or frame's value we are saving. */ | |
3356 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3357 | { | |
3358 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3359 | || (BLV_FOUND (SYMBOL_BLV (sym)) | |
3360 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); | |
3361 | where = cur_buf; | |
3362 | } | |
3363 | else if (sym->redirect == SYMBOL_LOCALIZED | |
3364 | && BLV_FOUND (SYMBOL_BLV (sym))) | |
3365 | where = SYMBOL_BLV (sym)->where; | |
3366 | else | |
3367 | where = Qnil; | |
3368 | ||
3369 | /* We're not using the `unused' slot in the specbinding | |
3370 | structure because this would mean we have to do more | |
3371 | work for simple variables. */ | |
3372 | /* FIXME: The third value `current_buffer' is only used in | |
3373 | let_shadows_buffer_binding_p which is itself only used | |
3374 | in set_internal for local_if_set. */ | |
4e2db1fe | 3375 | eassert (NILP (where) || EQ (where, cur_buf)); |
ce5b453a SM |
3376 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, cur_buf)); |
3377 | ||
3378 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3379 | buffer-local value here, make the `let' change the global | |
3380 | value by changing the value of SYMBOL in all buffers not | |
3381 | having their own value. This is consistent with what | |
3382 | happens with other buffer-local variables. */ | |
3383 | if (NILP (where) | |
3384 | && sym->redirect == SYMBOL_FORWARDED) | |
3385 | { | |
3386 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3387 | ++specpdl_ptr; | |
3388 | Fset_default (symbol, value); | |
3389 | return; | |
3390 | } | |
3391 | } | |
3392 | else | |
3393 | specpdl_ptr->symbol = symbol; | |
3394 | ||
3395 | specpdl_ptr++; | |
94b612ad | 3396 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3397 | break; |
3398 | } | |
3399 | default: abort (); | |
9ab90667 | 3400 | } |
db9f0278 JB |
3401 | } |
3402 | ||
3403 | void | |
d3da34e0 | 3404 | record_unwind_protect (Lisp_Object (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3405 | { |
9ba8e10d CY |
3406 | eassert (!handling_signal); |
3407 | ||
db9f0278 JB |
3408 | if (specpdl_ptr == specpdl + specpdl_size) |
3409 | grow_specpdl (); | |
3410 | specpdl_ptr->func = function; | |
3411 | specpdl_ptr->symbol = Qnil; | |
3412 | specpdl_ptr->old_value = arg; | |
3413 | specpdl_ptr++; | |
3414 | } | |
3415 | ||
3416 | Lisp_Object | |
d3da34e0 | 3417 | unbind_to (int count, Lisp_Object value) |
db9f0278 | 3418 | { |
5a073f50 KS |
3419 | Lisp_Object quitf = Vquit_flag; |
3420 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3421 | |
5a073f50 | 3422 | GCPRO2 (value, quitf); |
db9f0278 JB |
3423 | Vquit_flag = Qnil; |
3424 | ||
3425 | while (specpdl_ptr != specpdl + count) | |
3426 | { | |
611a8f8c RS |
3427 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3428 | the work to unbind it. We decrement first | |
3429 | so that an error in unbinding won't try to unbind | |
3430 | the same entry again, and we copy the binding first | |
3431 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3432 | |
45f266dc DL |
3433 | struct specbinding this_binding; |
3434 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3435 | |
3436 | if (this_binding.func != 0) | |
3437 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3438 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3439 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3440 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3441 | bound a variable that had a buffer-local or frame-local |
3442 | binding. WHERE nil means that the variable had the default | |
0967b4b0 | 3443 | value when it was bound. CURRENT-BUFFER is the buffer that |
bb8e180f | 3444 | was current when the variable was bound. */ |
611a8f8c | 3445 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3446 | { |
eb700b82 | 3447 | Lisp_Object symbol, where; |
719177b3 | 3448 | |
611a8f8c RS |
3449 | symbol = XCAR (this_binding.symbol); |
3450 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3451 | |
eb700b82 | 3452 | if (NILP (where)) |
611a8f8c | 3453 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3454 | /* If `where' is non-nil, reset the value in the appropriate |
3455 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3456 | else if (BUFFERP (where) |
3457 | ? !NILP (Flocal_variable_p (symbol, where)) | |
3458 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) | |
3459 | set_internal (symbol, this_binding.old_value, where, 1); | |
719177b3 | 3460 | } |
94b612ad SM |
3461 | /* If variable has a trivial value (no forwarding), we can |
3462 | just set it. No need to check for constant symbols here, | |
3463 | since that was already done by specbind. */ | |
3464 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3465 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3466 | this_binding.old_value); | |
db9f0278 | 3467 | else |
94b612ad SM |
3468 | /* NOTE: we only ever come here if make_local_foo was used for |
3469 | the first time on this var within this let. */ | |
3470 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3471 | } |
177c0ea7 | 3472 | |
5a073f50 KS |
3473 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3474 | Vquit_flag = quitf; | |
db9f0278 JB |
3475 | |
3476 | UNGCPRO; | |
db9f0278 JB |
3477 | return value; |
3478 | } | |
b9598260 | 3479 | |
4a330052 | 3480 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3481 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3482 | A special variable is one that will be bound dynamically, even in a | |
3483 | context where binding is lexical by default. */) | |
c566235d | 3484 | (Lisp_Object symbol) |
b9598260 SM |
3485 | { |
3486 | CHECK_SYMBOL (symbol); | |
3487 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3488 | } | |
3489 | ||
db9f0278 | 3490 | \f |
db9f0278 | 3491 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3492 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3493 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3494 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 JB |
3495 | { |
3496 | register struct backtrace *backlist = backtrace_list; | |
3497 | register int i; | |
3498 | ||
b7826503 | 3499 | CHECK_NUMBER (level); |
db9f0278 JB |
3500 | |
3501 | for (i = 0; backlist && i < XINT (level); i++) | |
3502 | { | |
3503 | backlist = backlist->next; | |
3504 | } | |
3505 | ||
3506 | if (backlist) | |
265a9e55 | 3507 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3508 | |
3509 | return flag; | |
3510 | } | |
3511 | ||
3512 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3513 | doc: /* Print a trace of Lisp function calls currently active. |
3514 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3515 | (void) |
db9f0278 JB |
3516 | { |
3517 | register struct backtrace *backlist = backtrace_list; | |
db9f0278 JB |
3518 | Lisp_Object tail; |
3519 | Lisp_Object tem; | |
db9f0278 | 3520 | struct gcpro gcpro1; |
d4b6d95d | 3521 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3522 | |
d4b6d95d LMI |
3523 | if (NILP (Vprint_level)) |
3524 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 JB |
3525 | |
3526 | tail = Qnil; | |
3527 | GCPRO1 (tail); | |
3528 | ||
3529 | while (backlist) | |
3530 | { | |
3531 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
44f230aa | 3532 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3533 | { |
3534 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3535 | write_string ("\n", -1); |
db9f0278 JB |
3536 | } |
3537 | else | |
3538 | { | |
3539 | tem = *backlist->function; | |
f6d62986 | 3540 | Fprin1 (tem, Qnil); /* This can QUIT. */ |
db9f0278 | 3541 | write_string ("(", -1); |
44f230aa SM |
3542 | if (backlist->nargs == MANY) |
3543 | { /* FIXME: Can this happen? */ | |
a3eed478 | 3544 | int i; |
db9f0278 | 3545 | for (tail = *backlist->args, i = 0; |
265a9e55 | 3546 | !NILP (tail); |
a3eed478 | 3547 | tail = Fcdr (tail), i = 1) |
db9f0278 JB |
3548 | { |
3549 | if (i) write_string (" ", -1); | |
3550 | Fprin1 (Fcar (tail), Qnil); | |
3551 | } | |
3552 | } | |
3553 | else | |
3554 | { | |
f66c7cf8 | 3555 | ptrdiff_t i; |
db9f0278 JB |
3556 | for (i = 0; i < backlist->nargs; i++) |
3557 | { | |
3558 | if (i) write_string (" ", -1); | |
3559 | Fprin1 (backlist->args[i], Qnil); | |
3560 | } | |
3561 | } | |
b6703b02 | 3562 | write_string (")\n", -1); |
db9f0278 | 3563 | } |
db9f0278 JB |
3564 | backlist = backlist->next; |
3565 | } | |
3566 | ||
d4b6d95d | 3567 | Vprint_level = old_print_level; |
db9f0278 JB |
3568 | UNGCPRO; |
3569 | return Qnil; | |
3570 | } | |
3571 | ||
17401c97 | 3572 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3573 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3574 | If that frame has not evaluated the arguments yet (or is a special form), | |
3575 | the value is (nil FUNCTION ARG-FORMS...). | |
3576 | If that frame has evaluated its arguments and called its function already, | |
3577 | the value is (t FUNCTION ARG-VALUES...). | |
3578 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3579 | FUNCTION is whatever was supplied as car of evaluated list, | |
3580 | or a lambda expression for macro calls. | |
3581 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3582 | (Lisp_Object nframes) |
db9f0278 JB |
3583 | { |
3584 | register struct backtrace *backlist = backtrace_list; | |
5d5d959d | 3585 | register EMACS_INT i; |
db9f0278 JB |
3586 | Lisp_Object tem; |
3587 | ||
b7826503 | 3588 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3589 | |
3590 | /* Find the frame requested. */ | |
b6703b02 | 3591 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3592 | backlist = backlist->next; |
3593 | ||
3594 | if (!backlist) | |
3595 | return Qnil; | |
44f230aa | 3596 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3597 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); |
3598 | else | |
3599 | { | |
44f230aa | 3600 | if (backlist->nargs == MANY) /* FIXME: Can this happen? */ |
db9f0278 JB |
3601 | tem = *backlist->args; |
3602 | else | |
3603 | tem = Flist (backlist->nargs, backlist->args); | |
3604 | ||
3605 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3606 | } | |
3607 | } | |
a2ff3819 | 3608 | |
db9f0278 | 3609 | \f |
244ed907 | 3610 | #if BYTE_MARK_STACK |
4ce0541e | 3611 | void |
d3da34e0 | 3612 | mark_backtrace (void) |
4ce0541e SM |
3613 | { |
3614 | register struct backtrace *backlist; | |
f66c7cf8 | 3615 | ptrdiff_t i; |
4ce0541e SM |
3616 | |
3617 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3618 | { | |
3619 | mark_object (*backlist->function); | |
3620 | ||
44f230aa SM |
3621 | if (backlist->nargs == UNEVALLED |
3622 | || backlist->nargs == MANY) /* FIXME: Can this happen? */ | |
c5101a77 | 3623 | i = 1; |
4ce0541e | 3624 | else |
c5101a77 PE |
3625 | i = backlist->nargs; |
3626 | while (i--) | |
4ce0541e SM |
3627 | mark_object (backlist->args[i]); |
3628 | } | |
3629 | } | |
244ed907 | 3630 | #endif |
4ce0541e | 3631 | |
dfcf069d | 3632 | void |
d3da34e0 | 3633 | syms_of_eval (void) |
db9f0278 | 3634 | { |
29208e82 | 3635 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
82fc29a1 | 3636 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3637 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3638 | an error is signaled. |
3639 | You can safely use a value considerably larger than the default value, | |
3640 | if that proves inconveniently small. However, if you increase it too far, | |
3641 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3642 | |
29208e82 | 3643 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
9dbc9081 | 3644 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3645 | |
3646 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3647 | actual stack overflow in C, which would be fatal for Emacs. |
3648 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3649 | if that proves inconveniently small. However, if you increase it too far, |
3650 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3651 | |
29208e82 | 3652 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3653 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3654 | If the value is t, that means do an ordinary quit. |
3655 | If the value equals `throw-on-input', that means quit by throwing | |
3656 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3657 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3658 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3659 | Vquit_flag = Qnil; |
3660 | ||
29208e82 | 3661 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3662 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3663 | Note that `quit-flag' will still be set by typing C-g, | |
3664 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3665 | To prevent this happening, set `quit-flag' to nil | |
3666 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3667 | Vinhibit_quit = Qnil; |
3668 | ||
cd3520a4 JB |
3669 | DEFSYM (Qinhibit_quit, "inhibit-quit"); |
3670 | DEFSYM (Qautoload, "autoload"); | |
3671 | DEFSYM (Qdebug_on_error, "debug-on-error"); | |
3672 | DEFSYM (Qmacro, "macro"); | |
3673 | DEFSYM (Qdeclare, "declare"); | |
177c0ea7 | 3674 | |
db9f0278 JB |
3675 | /* Note that the process handling also uses Qexit, but we don't want |
3676 | to staticpro it twice, so we just do it here. */ | |
cd3520a4 | 3677 | DEFSYM (Qexit, "exit"); |
b9598260 | 3678 | |
cd3520a4 JB |
3679 | DEFSYM (Qinteractive, "interactive"); |
3680 | DEFSYM (Qcommandp, "commandp"); | |
3681 | DEFSYM (Qdefun, "defun"); | |
3682 | DEFSYM (Qand_rest, "&rest"); | |
3683 | DEFSYM (Qand_optional, "&optional"); | |
3684 | DEFSYM (Qclosure, "closure"); | |
3685 | DEFSYM (Qdebug, "debug"); | |
f01cbfdd | 3686 | |
29208e82 | 3687 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
9dbc9081 PJ |
3688 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3689 | Does not apply to errors handled by `condition-case' or those | |
3690 | matched by `debug-ignored-errors'. | |
3691 | If the value is a list, an error only means to enter the debugger | |
3692 | if one of its condition symbols appears in the list. | |
3693 | When you evaluate an expression interactively, this variable | |
3694 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f CY |
3695 | The command `toggle-debug-on-error' toggles this. |
3696 | See also the variable `debug-on-quit'. */); | |
128c0f66 | 3697 | Vdebug_on_error = Qnil; |
db9f0278 | 3698 | |
29208e82 | 3699 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
9dbc9081 PJ |
3700 | doc: /* *List of errors for which the debugger should not be called. |
3701 | Each element may be a condition-name or a regexp that matches error messages. | |
3702 | If any element applies to a given error, that error skips the debugger | |
3703 | and just returns to top level. | |
3704 | This overrides the variable `debug-on-error'. | |
3705 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3706 | Vdebug_ignored_errors = Qnil; |
3707 | ||
29208e82 | 3708 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
82fc29a1 JB |
3709 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3710 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3711 | debug_on_quit = 0; |
3712 | ||
29208e82 | 3713 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3714 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3715 | |
29208e82 | 3716 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3717 | doc: /* Non-nil means debugger may continue execution. |
3718 | This is nil when the debugger is called under circumstances where it | |
3719 | might not be safe to continue. */); | |
dac204bc | 3720 | debugger_may_continue = 1; |
556d7314 | 3721 | |
29208e82 | 3722 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3723 | doc: /* Function to call to invoke debugger. |
3724 | If due to frame exit, args are `exit' and the value being returned; | |
3725 | this function's value will be returned instead of that. | |
3726 | If due to error, args are `error' and a list of the args to `signal'. | |
3727 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3728 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3729 | Vdebugger = Qnil; |
3730 | ||
29208e82 | 3731 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3732 | doc: /* If non-nil, this is a function for `signal' to call. |
3733 | It receives the same arguments that `signal' was given. | |
3734 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3735 | Vsignal_hook_function = Qnil; |
3736 | ||
29208e82 | 3737 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
9dbc9081 PJ |
3738 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3739 | Note that `debug-on-error', `debug-on-quit' and friends | |
3740 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3741 | Vdebug_on_signal = Qnil; |
61ede770 | 3742 | |
29208e82 | 3743 | DEFVAR_LISP ("macro-declaration-function", Vmacro_declaration_function, |
d6edd563 GM |
3744 | doc: /* Function to process declarations in a macro definition. |
3745 | The function will be called with two args MACRO and DECL. | |
3746 | MACRO is the name of the macro being defined. | |
3747 | DECL is a list `(declare ...)' containing the declarations. | |
3748 | The value the function returns is not used. */); | |
3749 | Vmacro_declaration_function = Qnil; | |
3750 | ||
b38b1ec0 SM |
3751 | /* When lexical binding is being used, |
3752 | vinternal_interpreter_environment is non-nil, and contains an alist | |
3753 | of lexically-bound variable, or (t), indicating an empty | |
3754 | environment. The lisp name of this variable would be | |
3755 | `internal-interpreter-environment' if it weren't hidden. | |
3756 | Every element of this list can be either a cons (VAR . VAL) | |
3757 | specifying a lexical binding, or a single symbol VAR indicating | |
3758 | that this variable should use dynamic scoping. */ | |
cd3520a4 | 3759 | DEFSYM (Qinternal_interpreter_environment, "internal-interpreter-environment"); |
b38b1ec0 SM |
3760 | DEFVAR_LISP ("internal-interpreter-environment", |
3761 | Vinternal_interpreter_environment, | |
b9598260 SM |
3762 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
3763 | When lexical binding is not being used, this variable is nil. | |
3764 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3765 | alist of active lexical bindings. */); | |
3766 | Vinternal_interpreter_environment = Qnil; | |
b38b1ec0 SM |
3767 | /* Don't export this variable to Elisp, so noone can mess with it |
3768 | (Just imagine if someone makes it buffer-local). */ | |
3769 | Funintern (Qinternal_interpreter_environment, Qnil); | |
b9598260 | 3770 | |
cd3520a4 | 3771 | DEFSYM (Vrun_hooks, "run-hooks"); |
db9f0278 JB |
3772 | |
3773 | staticpro (&Vautoload_queue); | |
3774 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3775 | staticpro (&Vsignaling_function); |
3776 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3777 | |
3778 | defsubr (&Sor); | |
3779 | defsubr (&Sand); | |
3780 | defsubr (&Sif); | |
3781 | defsubr (&Scond); | |
3782 | defsubr (&Sprogn); | |
3783 | defsubr (&Sprog1); | |
3784 | defsubr (&Sprog2); | |
3785 | defsubr (&Ssetq); | |
3786 | defsubr (&Squote); | |
3787 | defsubr (&Sfunction); | |
3788 | defsubr (&Sdefun); | |
3789 | defsubr (&Sdefmacro); | |
3790 | defsubr (&Sdefvar); | |
19cebf5a | 3791 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3792 | defsubr (&Sdefconst); |
3793 | defsubr (&Suser_variable_p); | |
3794 | defsubr (&Slet); | |
3795 | defsubr (&SletX); | |
3796 | defsubr (&Swhile); | |
3797 | defsubr (&Smacroexpand); | |
3798 | defsubr (&Scatch); | |
3799 | defsubr (&Sthrow); | |
3800 | defsubr (&Sunwind_protect); | |
3801 | defsubr (&Scondition_case); | |
3802 | defsubr (&Ssignal); | |
3803 | defsubr (&Sinteractive_p); | |
4b664e76 | 3804 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
3805 | defsubr (&Scommandp); |
3806 | defsubr (&Sautoload); | |
3807 | defsubr (&Seval); | |
3808 | defsubr (&Sapply); | |
3809 | defsubr (&Sfuncall); | |
ff936e53 SM |
3810 | defsubr (&Srun_hooks); |
3811 | defsubr (&Srun_hook_with_args); | |
3812 | defsubr (&Srun_hook_with_args_until_success); | |
3813 | defsubr (&Srun_hook_with_args_until_failure); | |
f6d62986 | 3814 | defsubr (&Srun_hook_wrapped); |
661c7d6e | 3815 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3816 | defsubr (&Sbacktrace_debug); |
3817 | defsubr (&Sbacktrace); | |
3818 | defsubr (&Sbacktrace_frame); | |
4a330052 | 3819 | defsubr (&Sspecial_variable_p); |
b9598260 | 3820 | defsubr (&Sfunctionp); |
db9f0278 | 3821 | } |