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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> |
db9f0278 | 23 | #include "lisp.h" |
9ac0d9e0 | 24 | #include "blockinput.h" |
db9f0278 | 25 | #include "commands.h" |
1f98fa48 | 26 | #include "keyboard.h" |
3648c842 | 27 | #include "dispextern.h" |
94b612ad | 28 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 29 | |
b70e1a2b SM |
30 | #if HAVE_X_WINDOWS |
31 | #include "xterm.h" | |
32 | #endif | |
33 | ||
eb3f1cc8 PE |
34 | #ifndef SIZE_MAX |
35 | # define SIZE_MAX ((size_t) -1) | |
36 | #endif | |
37 | ||
f6d62986 SM |
38 | /* This definition is duplicated in alloc.c and keyboard.c. */ |
39 | /* Putting it in lisp.h makes cc bomb out! */ | |
db9f0278 JB |
40 | |
41 | struct backtrace | |
4c576a83 GM |
42 | { |
43 | struct backtrace *next; | |
44 | Lisp_Object *function; | |
f6d62986 | 45 | Lisp_Object *args; /* Points to vector of args. */ |
44f230aa SM |
46 | #define NARGS_BITS (BITS_PER_INT - 2) |
47 | /* Let's not use size_t because we want to allow negative values (for | |
48 | UNEVALLED). Also let's steal 2 bits so we save a word (or more for | |
49 | alignment). In any case I doubt Emacs would survive a function call with | |
50 | more than 500M arguments. */ | |
51 | int nargs : NARGS_BITS; /* Length of vector. | |
52 | If nargs is UNEVALLED, args points | |
53 | to slot holding list of unevalled args. */ | |
54 | char evalargs : 1; | |
f6d62986 | 55 | /* Nonzero means call value of debugger when done with this operation. */ |
44f230aa | 56 | char debug_on_exit : 1; |
4c576a83 | 57 | }; |
db9f0278 JB |
58 | |
59 | struct backtrace *backtrace_list; | |
db9f0278 JB |
60 | struct catchtag *catchlist; |
61 | ||
15934ffa RS |
62 | #ifdef DEBUG_GCPRO |
63 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
64 | int gcpro_level; | |
65 | #endif | |
66 | ||
6fd797f5 | 67 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
29208e82 | 68 | Lisp_Object Qinhibit_quit; |
db9f0278 JB |
69 | Lisp_Object Qand_rest, Qand_optional; |
70 | Lisp_Object Qdebug_on_error; | |
d6edd563 | 71 | Lisp_Object Qdeclare; |
b9598260 SM |
72 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
73 | ||
f01cbfdd | 74 | Lisp_Object Qdebug; |
db9f0278 | 75 | |
6e6e9f08 RS |
76 | /* This holds either the symbol `run-hooks' or nil. |
77 | It is nil at an early stage of startup, and when Emacs | |
78 | is shutting down. */ | |
4c576a83 | 79 | |
db9f0278 JB |
80 | Lisp_Object Vrun_hooks; |
81 | ||
82 | /* Non-nil means record all fset's and provide's, to be undone | |
83 | if the file being autoloaded is not fully loaded. | |
84 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 85 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
86 | |
87 | Lisp_Object Vautoload_queue; | |
88 | ||
89 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 90 | |
5816888b | 91 | EMACS_INT specpdl_size; |
db9f0278 JB |
92 | |
93 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 94 | |
db9f0278 JB |
95 | struct specbinding *specpdl; |
96 | ||
97 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 98 | |
ab837828 | 99 | struct specbinding *specpdl_ptr; |
db9f0278 | 100 | |
db9f0278 | 101 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 102 | |
5816888b | 103 | EMACS_INT lisp_eval_depth; |
db9f0278 | 104 | |
be857679 | 105 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 106 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 107 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
108 | know that the debugger itself has an error, and we should just |
109 | signal the error instead of entering an infinite loop of debugger | |
110 | invocations. */ | |
4c576a83 | 111 | |
82da7701 | 112 | int when_entered_debugger; |
db9f0278 | 113 | |
a2ff3819 GM |
114 | /* The function from which the last `signal' was called. Set in |
115 | Fsignal. */ | |
116 | ||
117 | Lisp_Object Vsignaling_function; | |
118 | ||
4c576a83 GM |
119 | /* Set to non-zero while processing X events. Checked in Feval to |
120 | make sure the Lisp interpreter isn't called from a signal handler, | |
121 | which is unsafe because the interpreter isn't reentrant. */ | |
122 | ||
123 | int handling_signal; | |
124 | ||
40d83b41 | 125 | static Lisp_Object funcall_lambda (Lisp_Object, size_t, Lisp_Object *); |
f57e2426 | 126 | static void unwind_to_catch (struct catchtag *, Lisp_Object) NO_RETURN; |
2f7c71a1 | 127 | static int interactive_p (int); |
7200d79c | 128 | static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args); |
16a97296 | 129 | INFUN (Ffetch_bytecode, 1); |
873759d5 | 130 | \f |
dfcf069d | 131 | void |
d3da34e0 | 132 | init_eval_once (void) |
db9f0278 JB |
133 | { |
134 | specpdl_size = 50; | |
716acfce | 135 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 136 | specpdl_ptr = specpdl; |
6588243d | 137 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
c530e1c2 | 138 | max_specpdl_size = 1300; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 139 | max_lisp_eval_depth = 600; |
34d470ba RS |
140 | |
141 | Vrun_hooks = Qnil; | |
db9f0278 JB |
142 | } |
143 | ||
dfcf069d | 144 | void |
d3da34e0 | 145 | init_eval (void) |
db9f0278 JB |
146 | { |
147 | specpdl_ptr = specpdl; | |
148 | catchlist = 0; | |
149 | handlerlist = 0; | |
150 | backtrace_list = 0; | |
151 | Vquit_flag = Qnil; | |
152 | debug_on_next_call = 0; | |
153 | lisp_eval_depth = 0; | |
87e21fbd | 154 | #ifdef DEBUG_GCPRO |
15934ffa | 155 | gcpro_level = 0; |
87e21fbd | 156 | #endif |
be857679 | 157 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 158 | when_entered_debugger = -1; |
db9f0278 JB |
159 | } |
160 | ||
f6d62986 | 161 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb RS |
162 | |
163 | static Lisp_Object | |
d3da34e0 | 164 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
165 | { |
166 | max_specpdl_size = XINT (XCAR (data)); | |
167 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 168 | return Qnil; |
9f5903bb RS |
169 | } |
170 | ||
171 | /* Call the Lisp debugger, giving it argument ARG. */ | |
172 | ||
475545b5 | 173 | static Lisp_Object |
d3da34e0 | 174 | call_debugger (Lisp_Object arg) |
db9f0278 | 175 | { |
3648c842 | 176 | int debug_while_redisplaying; |
aed13378 | 177 | int count = SPECPDL_INDEX (); |
3648c842 | 178 | Lisp_Object val; |
5816888b | 179 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 180 | |
9f5903bb RS |
181 | /* Temporarily bump up the stack limits, |
182 | so the debugger won't run out of stack. */ | |
177c0ea7 | 183 | |
9f5903bb RS |
184 | max_specpdl_size += 1; |
185 | record_unwind_protect (restore_stack_limits, | |
186 | Fcons (make_number (old_max), | |
187 | make_number (max_lisp_eval_depth))); | |
188 | max_specpdl_size = old_max; | |
189 | ||
190 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
191 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
192 | ||
193 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
194 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 195 | |
d148e14d | 196 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
197 | if (display_hourglass_p) |
198 | cancel_hourglass (); | |
237c23b0 GM |
199 | #endif |
200 | ||
db9f0278 | 201 | debug_on_next_call = 0; |
be857679 | 202 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
203 | |
204 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
205 | displayed if the debugger is invoked during redisplay. */ | |
206 | debug_while_redisplaying = redisplaying_p; | |
207 | redisplaying_p = 0; | |
556d7314 GM |
208 | specbind (intern ("debugger-may-continue"), |
209 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 210 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 211 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
212 | |
213 | #if 0 /* Binding this prevents execution of Lisp code during | |
214 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 215 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 216 | #endif |
177c0ea7 | 217 | |
3648c842 GM |
218 | val = apply1 (Vdebugger, arg); |
219 | ||
220 | /* Interrupting redisplay and resuming it later is not safe under | |
221 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 222 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
223 | if (debug_while_redisplaying) |
224 | Ftop_level (); | |
225 | ||
556d7314 | 226 | return unbind_to (count, val); |
db9f0278 JB |
227 | } |
228 | ||
475545b5 | 229 | static void |
d3da34e0 | 230 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
231 | { |
232 | debug_on_next_call = 0; | |
233 | backtrace_list->debug_on_exit = 1; | |
234 | call_debugger (Fcons (code, Qnil)); | |
235 | } | |
236 | \f | |
237 | /* NOTE!!! Every function that can call EVAL must protect its args | |
238 | and temporaries from garbage collection while it needs them. | |
239 | The definition of `For' shows what you have to do. */ | |
240 | ||
241 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
242 | doc: /* Eval args until one of them yields non-nil, then return that value. |
243 | The remaining args are not evalled at all. | |
244 | If all args return nil, return nil. | |
533eb34b | 245 | usage: (or CONDITIONS...) */) |
5842a27b | 246 | (Lisp_Object args) |
db9f0278 | 247 | { |
e509f168 | 248 | register Lisp_Object val = Qnil; |
db9f0278 JB |
249 | struct gcpro gcpro1; |
250 | ||
e509f168 | 251 | GCPRO1 (args); |
db9f0278 | 252 | |
e509f168 | 253 | while (CONSP (args)) |
db9f0278 | 254 | { |
defb1411 | 255 | val = eval_sub (XCAR (args)); |
265a9e55 | 256 | if (!NILP (val)) |
db9f0278 | 257 | break; |
e509f168 | 258 | args = XCDR (args); |
db9f0278 | 259 | } |
db9f0278 JB |
260 | |
261 | UNGCPRO; | |
262 | return val; | |
263 | } | |
264 | ||
265 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 266 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
267 | The remaining args are not evalled at all. |
268 | If no arg yields nil, return the last arg's value. | |
533eb34b | 269 | usage: (and CONDITIONS...) */) |
5842a27b | 270 | (Lisp_Object args) |
db9f0278 | 271 | { |
e509f168 | 272 | register Lisp_Object val = Qt; |
db9f0278 JB |
273 | struct gcpro gcpro1; |
274 | ||
e509f168 | 275 | GCPRO1 (args); |
db9f0278 | 276 | |
e509f168 | 277 | while (CONSP (args)) |
db9f0278 | 278 | { |
defb1411 | 279 | val = eval_sub (XCAR (args)); |
265a9e55 | 280 | if (NILP (val)) |
db9f0278 | 281 | break; |
e509f168 | 282 | args = XCDR (args); |
db9f0278 | 283 | } |
db9f0278 JB |
284 | |
285 | UNGCPRO; | |
286 | return val; | |
287 | } | |
288 | ||
289 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 290 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
291 | Returns the value of THEN or the value of the last of the ELSE's. |
292 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
293 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 294 | usage: (if COND THEN ELSE...) */) |
5842a27b | 295 | (Lisp_Object args) |
db9f0278 JB |
296 | { |
297 | register Lisp_Object cond; | |
298 | struct gcpro gcpro1; | |
299 | ||
300 | GCPRO1 (args); | |
defb1411 | 301 | cond = eval_sub (Fcar (args)); |
db9f0278 JB |
302 | UNGCPRO; |
303 | ||
265a9e55 | 304 | if (!NILP (cond)) |
defb1411 | 305 | return eval_sub (Fcar (Fcdr (args))); |
db9f0278 JB |
306 | return Fprogn (Fcdr (Fcdr (args))); |
307 | } | |
308 | ||
309 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
310 | doc: /* Try each clause until one succeeds. |
311 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
312 | and, if the value is non-nil, this clause succeeds: | |
313 | then the expressions in BODY are evaluated and the last one's | |
314 | value is the value of the cond-form. | |
315 | If no clause succeeds, cond returns nil. | |
316 | If a clause has one element, as in (CONDITION), | |
317 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 318 | usage: (cond CLAUSES...) */) |
5842a27b | 319 | (Lisp_Object args) |
db9f0278 JB |
320 | { |
321 | register Lisp_Object clause, val; | |
322 | struct gcpro gcpro1; | |
323 | ||
324 | val = Qnil; | |
325 | GCPRO1 (args); | |
265a9e55 | 326 | while (!NILP (args)) |
db9f0278 JB |
327 | { |
328 | clause = Fcar (args); | |
defb1411 | 329 | val = eval_sub (Fcar (clause)); |
265a9e55 | 330 | if (!NILP (val)) |
db9f0278 | 331 | { |
03699b14 KR |
332 | if (!EQ (XCDR (clause), Qnil)) |
333 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
334 | break; |
335 | } | |
03699b14 | 336 | args = XCDR (args); |
db9f0278 JB |
337 | } |
338 | UNGCPRO; | |
339 | ||
340 | return val; | |
341 | } | |
342 | ||
16a97296 | 343 | DEFUE ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, |
9dbc9081 | 344 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 345 | usage: (progn BODY...) */) |
5842a27b | 346 | (Lisp_Object args) |
db9f0278 | 347 | { |
e509f168 | 348 | register Lisp_Object val = Qnil; |
db9f0278 JB |
349 | struct gcpro gcpro1; |
350 | ||
e509f168 | 351 | GCPRO1 (args); |
db9f0278 | 352 | |
e509f168 | 353 | while (CONSP (args)) |
db9f0278 | 354 | { |
defb1411 | 355 | val = eval_sub (XCAR (args)); |
e509f168 | 356 | args = XCDR (args); |
db9f0278 | 357 | } |
db9f0278 JB |
358 | |
359 | UNGCPRO; | |
360 | return val; | |
361 | } | |
362 | ||
363 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 364 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
365 | The value of FIRST is saved during the evaluation of the remaining args, |
366 | whose values are discarded. | |
7a25dc6d | 367 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 368 | (Lisp_Object args) |
db9f0278 JB |
369 | { |
370 | Lisp_Object val; | |
371 | register Lisp_Object args_left; | |
372 | struct gcpro gcpro1, gcpro2; | |
373 | register int argnum = 0; | |
374 | ||
9ac66b45 | 375 | if (NILP (args)) |
db9f0278 JB |
376 | return Qnil; |
377 | ||
378 | args_left = args; | |
379 | val = Qnil; | |
380 | GCPRO2 (args, val); | |
381 | ||
382 | do | |
383 | { | |
ba83908c | 384 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 385 | if (!(argnum++)) |
ba83908c SM |
386 | val = tem; |
387 | args_left = XCDR (args_left); | |
db9f0278 | 388 | } |
ba83908c | 389 | while (CONSP (args_left)); |
db9f0278 JB |
390 | |
391 | UNGCPRO; | |
392 | return val; | |
393 | } | |
394 | ||
395 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 396 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
397 | The value of FORM2 is saved during the evaluation of the |
398 | remaining args, whose values are discarded. | |
399 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 400 | (Lisp_Object args) |
db9f0278 JB |
401 | { |
402 | Lisp_Object val; | |
403 | register Lisp_Object args_left; | |
404 | struct gcpro gcpro1, gcpro2; | |
405 | register int argnum = -1; | |
406 | ||
407 | val = Qnil; | |
408 | ||
87d238ba | 409 | if (NILP (args)) |
db9f0278 JB |
410 | return Qnil; |
411 | ||
412 | args_left = args; | |
413 | val = Qnil; | |
414 | GCPRO2 (args, val); | |
415 | ||
416 | do | |
417 | { | |
ba83908c | 418 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 419 | if (!(argnum++)) |
ba83908c SM |
420 | val = tem; |
421 | args_left = XCDR (args_left); | |
db9f0278 | 422 | } |
ba83908c | 423 | while (CONSP (args_left)); |
db9f0278 JB |
424 | |
425 | UNGCPRO; | |
426 | return val; | |
427 | } | |
428 | ||
429 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
430 | doc: /* Set each SYM to the value of its VAL. |
431 | The symbols SYM are variables; they are literal (not evaluated). | |
432 | The values VAL are expressions; they are evaluated. | |
433 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
434 | The second VAL is not computed until after the first SYM is set, and so on; | |
435 | each VAL can use the new value of variables set earlier in the `setq'. | |
436 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 437 | usage: (setq [SYM VAL]...) */) |
5842a27b | 438 | (Lisp_Object args) |
db9f0278 JB |
439 | { |
440 | register Lisp_Object args_left; | |
b9598260 | 441 | register Lisp_Object val, sym, lex_binding; |
db9f0278 JB |
442 | struct gcpro gcpro1; |
443 | ||
1283140e | 444 | if (NILP (args)) |
db9f0278 JB |
445 | return Qnil; |
446 | ||
447 | args_left = args; | |
448 | GCPRO1 (args); | |
449 | ||
450 | do | |
451 | { | |
defb1411 | 452 | val = eval_sub (Fcar (Fcdr (args_left))); |
db9f0278 | 453 | sym = Fcar (args_left); |
b9598260 | 454 | |
defb1411 | 455 | /* Like for eval_sub, we do not check declared_special here since |
f07a954e SM |
456 | it's been done when let-binding. */ |
457 | if (!NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
b9598260 | 458 | && SYMBOLP (sym) |
f07a954e SM |
459 | && !NILP (lex_binding |
460 | = Fassq (sym, Vinternal_interpreter_environment))) | |
b9598260 SM |
461 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ |
462 | else | |
463 | Fset (sym, val); /* SYM is dynamically bound. */ | |
464 | ||
db9f0278 JB |
465 | args_left = Fcdr (Fcdr (args_left)); |
466 | } | |
265a9e55 | 467 | while (!NILP(args_left)); |
db9f0278 JB |
468 | |
469 | UNGCPRO; | |
470 | return val; | |
471 | } | |
177c0ea7 | 472 | |
db9f0278 | 473 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
474 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
475 | usage: (quote ARG) */) | |
5842a27b | 476 | (Lisp_Object args) |
db9f0278 | 477 | { |
1283140e RS |
478 | if (!NILP (Fcdr (args))) |
479 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
480 | return Fcar (args); |
481 | } | |
177c0ea7 | 482 | |
db9f0278 | 483 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
484 | doc: /* Like `quote', but preferred for objects which are functions. |
485 | In byte compilation, `function' causes its argument to be compiled. | |
486 | `quote' cannot do that. | |
487 | usage: (function ARG) */) | |
5842a27b | 488 | (Lisp_Object args) |
db9f0278 | 489 | { |
b9598260 SM |
490 | Lisp_Object quoted = XCAR (args); |
491 | ||
1283140e RS |
492 | if (!NILP (Fcdr (args))) |
493 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
b9598260 SM |
494 | |
495 | if (!NILP (Vinternal_interpreter_environment) | |
496 | && CONSP (quoted) | |
497 | && EQ (XCAR (quoted), Qlambda)) | |
498 | /* This is a lambda expression within a lexical environment; | |
499 | return an interpreted closure instead of a simple lambda. */ | |
23aba0ea SM |
500 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, |
501 | XCDR (quoted))); | |
b9598260 SM |
502 | else |
503 | /* Simply quote the argument. */ | |
504 | return quoted; | |
db9f0278 JB |
505 | } |
506 | ||
e0f331ab | 507 | |
16a97296 | 508 | DEFUE ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
84b17ab0 | 509 | doc: /* Return t if the containing function was run directly by user input. |
82fc29a1 JB |
510 | This means that the function was called with `call-interactively' |
511 | \(which includes being called as the binding of a key) | |
84b17ab0 | 512 | and input is currently coming from the keyboard (not a keyboard macro), |
c63df42b RS |
513 | and Emacs is not running in batch mode (`noninteractive' is nil). |
514 | ||
515 | The only known proper use of `interactive-p' is in deciding whether to | |
516 | display a helpful message, or how to display it. If you're thinking | |
517 | of using it for any other purpose, it is quite likely that you're | |
518 | making a mistake. Think: what do you want to do when the command is | |
519 | called from a keyboard macro? | |
520 | ||
84b17ab0 CY |
521 | To test whether your function was called with `call-interactively', |
522 | either (i) add an extra optional argument and give it an `interactive' | |
523 | spec that specifies non-nil unconditionally (such as \"p\"); or (ii) | |
524 | use `called-interactively-p'. */) | |
5842a27b | 525 | (void) |
db9f0278 | 526 | { |
b9598260 | 527 | return interactive_p (1) ? Qt : Qnil; |
e0f331ab GM |
528 | } |
529 | ||
530 | ||
9d28c33e | 531 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 1, 0, |
84b17ab0 | 532 | doc: /* Return t if the containing function was called by `call-interactively'. |
9d28c33e SM |
533 | If KIND is `interactive', then only return t if the call was made |
534 | interactively by the user, i.e. not in `noninteractive' mode nor | |
535 | when `executing-kbd-macro'. | |
536 | If KIND is `any', on the other hand, it will return t for any kind of | |
537 | interactive call, including being called as the binding of a key, or | |
538 | from a keyboard macro, or in `noninteractive' mode. | |
539 | ||
540 | The only known proper use of `interactive' for KIND is in deciding | |
541 | whether to display a helpful message, or how to display it. If you're | |
542 | thinking of using it for any other purpose, it is quite likely that | |
543 | you're making a mistake. Think: what do you want to do when the | |
544 | command is called from a keyboard macro? | |
84b17ab0 CY |
545 | |
546 | This function is meant for implementing advice and other | |
547 | function-modifying features. Instead of using this, it is sometimes | |
548 | cleaner to give your function an extra optional argument whose | |
549 | `interactive' spec specifies non-nil unconditionally (\"p\" is a good | |
9d28c33e | 550 | way to do this), or via (not (or executing-kbd-macro noninteractive)). */) |
5842a27b | 551 | (Lisp_Object kind) |
c63df42b | 552 | { |
9d28c33e SM |
553 | return ((INTERACTIVE || !EQ (kind, intern ("interactive"))) |
554 | && interactive_p (1)) ? Qt : Qnil; | |
c63df42b RS |
555 | } |
556 | ||
557 | ||
558 | /* Return 1 if function in which this appears was called using | |
559 | call-interactively. | |
e0f331ab GM |
560 | |
561 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
562 | called is a built-in. */ | |
563 | ||
2f7c71a1 | 564 | static int |
d3da34e0 | 565 | interactive_p (int exclude_subrs_p) |
e0f331ab GM |
566 | { |
567 | struct backtrace *btp; | |
568 | Lisp_Object fun; | |
db9f0278 | 569 | |
db9f0278 | 570 | btp = backtrace_list; |
daa37602 JB |
571 | |
572 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 573 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 574 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
575 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
576 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 577 | btp = btp->next; |
daa37602 JB |
578 | |
579 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
580 | may be a frame for Fbytecode at the top level. In any version of |
581 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
582 | inside catch and condition-case. Skip past them. | |
daa37602 | 583 | |
4402a9ed | 584 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 585 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
586 | while (btp |
587 | && (EQ (*btp->function, Qbytecode) | |
44f230aa | 588 | || btp->nargs == UNEVALLED)) |
a6e3fa71 JB |
589 | btp = btp->next; |
590 | ||
f6d62986 | 591 | /* `btp' now points at the frame of the innermost function that isn't |
daa37602 JB |
592 | a special form, ignoring frames for Finteractive_p and/or |
593 | Fbytecode at the top. If this frame is for a built-in function | |
594 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 595 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
596 | if (exclude_subrs_p && SUBRP (fun)) |
597 | return 0; | |
177c0ea7 | 598 | |
f6d62986 | 599 | /* `btp' points to the frame of a Lisp function that called interactive-p. |
db9f0278 JB |
600 | Return t if that function was called interactively. */ |
601 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
602 | return 1; |
603 | return 0; | |
db9f0278 JB |
604 | } |
605 | ||
e0f331ab | 606 | |
db9f0278 | 607 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
608 | doc: /* Define NAME as a function. |
609 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
610 | See also the function `interactive'. | |
7a25dc6d | 611 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
5842a27b | 612 | (Lisp_Object args) |
db9f0278 JB |
613 | { |
614 | register Lisp_Object fn_name; | |
615 | register Lisp_Object defn; | |
616 | ||
617 | fn_name = Fcar (args); | |
6992a868 | 618 | CHECK_SYMBOL (fn_name); |
db9f0278 | 619 | defn = Fcons (Qlambda, Fcdr (args)); |
f07a954e SM |
620 | if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */ |
621 | defn = Ffunction (Fcons (defn, Qnil)); | |
265a9e55 | 622 | if (!NILP (Vpurify_flag)) |
db9f0278 | 623 | defn = Fpurecopy (defn); |
f58e9f8c RS |
624 | if (CONSP (XSYMBOL (fn_name)->function) |
625 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
626 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 627 | Ffset (fn_name, defn); |
6fd797f5 | 628 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
629 | return fn_name; |
630 | } | |
631 | ||
632 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 633 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
634 | The actual definition looks like |
635 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
636 | When the macro is called, as in (NAME ARGS...), |
637 | the function (lambda ARGLIST BODY...) is applied to | |
638 | the list ARGS... as it appears in the expression, | |
639 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
640 | |
641 | DECL is a declaration, optional, which can specify how to indent | |
4ba50634 JPW |
642 | calls to this macro, how Edebug should handle it, and which argument |
643 | should be treated as documentation. It looks like this: | |
0654d6e3 RS |
644 | (declare SPECS...) |
645 | The elements can look like this: | |
646 | (indent INDENT) | |
647 | Set NAME's `lisp-indent-function' property to INDENT. | |
648 | ||
e509f168 | 649 | (debug DEBUG) |
0654d6e3 | 650 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 651 | equivalent to writing a `def-edebug-spec' for the macro.) |
4ba50634 JPW |
652 | |
653 | (doc-string ELT) | |
654 | Set NAME's `doc-string-elt' property to ELT. | |
655 | ||
0654d6e3 | 656 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
5842a27b | 657 | (Lisp_Object args) |
db9f0278 JB |
658 | { |
659 | register Lisp_Object fn_name; | |
660 | register Lisp_Object defn; | |
d6edd563 | 661 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
662 | |
663 | fn_name = Fcar (args); | |
8e975df9 | 664 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
665 | lambda_list = Fcar (Fcdr (args)); |
666 | tail = Fcdr (Fcdr (args)); | |
667 | ||
668 | doc = Qnil; | |
669 | if (STRINGP (Fcar (tail))) | |
670 | { | |
e509f168 SM |
671 | doc = XCAR (tail); |
672 | tail = XCDR (tail); | |
d6edd563 GM |
673 | } |
674 | ||
0193499f SM |
675 | if (CONSP (Fcar (tail)) |
676 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
d6edd563 GM |
677 | { |
678 | if (!NILP (Vmacro_declaration_function)) | |
679 | { | |
680 | struct gcpro gcpro1; | |
681 | GCPRO1 (args); | |
682 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
683 | UNGCPRO; | |
684 | } | |
177c0ea7 | 685 | |
d6edd563 GM |
686 | tail = Fcdr (tail); |
687 | } | |
688 | ||
689 | if (NILP (doc)) | |
690 | tail = Fcons (lambda_list, tail); | |
691 | else | |
692 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
7200d79c | 693 | |
b9598260 | 694 | defn = Fcons (Qlambda, tail); |
f07a954e SM |
695 | if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */ |
696 | defn = Ffunction (Fcons (defn, Qnil)); | |
b9598260 | 697 | defn = Fcons (Qmacro, defn); |
177c0ea7 | 698 | |
265a9e55 | 699 | if (!NILP (Vpurify_flag)) |
db9f0278 | 700 | defn = Fpurecopy (defn); |
f58e9f8c RS |
701 | if (CONSP (XSYMBOL (fn_name)->function) |
702 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
703 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 704 | Ffset (fn_name, defn); |
6fd797f5 | 705 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
706 | return fn_name; |
707 | } | |
708 | ||
19cebf5a | 709 | |
1848d15d | 710 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 711 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 712 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 713 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
714 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
715 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
716 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
717 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 718 | The return value is BASE-VARIABLE. */) |
5842a27b | 719 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
720 | { |
721 | struct Lisp_Symbol *sym; | |
1848d15d | 722 | |
4a9308b8 JB |
723 | CHECK_SYMBOL (new_alias); |
724 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 725 | |
4a9308b8 | 726 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
727 | |
728 | if (sym->constant) | |
178f2507 SM |
729 | /* Not sure why, but why not? */ |
730 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
731 | |
732 | switch (sym->redirect) | |
733 | { | |
734 | case SYMBOL_FORWARDED: | |
735 | error ("Cannot make an internal variable an alias"); | |
736 | case SYMBOL_LOCALIZED: | |
737 | error ("Don't know how to make a localized variable an alias"); | |
738 | } | |
739 | ||
dd60787c | 740 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
741 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
742 | so that old-code that affects n_a before the aliasing is setup | |
743 | still works. */ | |
744 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 745 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
746 | |
747 | { | |
748 | struct specbinding *p; | |
749 | ||
750 | for (p = specpdl_ptr - 1; p >= specpdl; p--) | |
751 | if (p->func == NULL | |
752 | && (EQ (new_alias, | |
753 | CONSP (p->symbol) ? XCAR (p->symbol) : p->symbol))) | |
754 | error ("Don't know how to make a let-bound variable an alias"); | |
755 | } | |
756 | ||
b9598260 | 757 | sym->declared_special = 1; |
ce5b453a SM |
758 | sym->redirect = SYMBOL_VARALIAS; |
759 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
760 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
761 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
762 | /* Even if docstring is nil: remove old docstring. */ |
763 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 764 | |
4a9308b8 | 765 | return base_variable; |
19cebf5a GM |
766 | } |
767 | ||
768 | ||
db9f0278 | 769 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 770 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
771 | You are not required to define a variable in order to use it, |
772 | but the definition can supply documentation and an initial value | |
773 | in a way that tags can recognize. | |
774 | ||
775 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
776 | If SYMBOL is buffer-local, its default value is what is set; | |
777 | buffer-local values are not affected. | |
778 | INITVALUE and DOCSTRING are optional. | |
779 | If DOCSTRING starts with *, this variable is identified as a user option. | |
780 | This means that M-x set-variable recognizes it. | |
781 | See also `user-variable-p'. | |
782 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
783 | |
784 | If SYMBOL has a local binding, then this form affects the local | |
785 | binding. This is usually not what you want. Thus, if you need to | |
786 | load a file defining variables, with this form or with `defconst' or | |
787 | `defcustom', you should always load that file _outside_ any bindings | |
788 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
789 | this respect.) | |
2df5238c | 790 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 791 | (Lisp_Object args) |
db9f0278 | 792 | { |
a42ba017 | 793 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
794 | |
795 | sym = Fcar (args); | |
a42ba017 RS |
796 | tail = Fcdr (args); |
797 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 798 | error ("Too many arguments"); |
a42ba017 | 799 | |
33568849 | 800 | tem = Fdefault_boundp (sym); |
a42ba017 | 801 | if (!NILP (tail)) |
db9f0278 | 802 | { |
ba83908c SM |
803 | /* Do it before evaluating the initial value, for self-references. */ |
804 | XSYMBOL (sym)->declared_special = 1; | |
590130fb | 805 | |
1c9916a1 SM |
806 | if (SYMBOL_CONSTANT_P (sym)) |
807 | { | |
808 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
1faed8ae PE |
809 | Lisp_Object tem1 = Fcar (tail); |
810 | if (! (CONSP (tem1) | |
811 | && EQ (XCAR (tem1), Qquote) | |
812 | && CONSP (XCDR (tem1)) | |
813 | && EQ (XCAR (XCDR (tem1)), sym))) | |
1c9916a1 SM |
814 | error ("Constant symbol `%s' specified in defvar", |
815 | SDATA (SYMBOL_NAME (sym))); | |
816 | } | |
817 | ||
265a9e55 | 818 | if (NILP (tem)) |
defb1411 | 819 | Fset_default (sym, eval_sub (Fcar (tail))); |
d0bce91e SM |
820 | else |
821 | { /* Check if there is really a global binding rather than just a let | |
822 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 823 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
824 | while (--pdl >= specpdl) |
825 | { | |
826 | if (EQ (pdl->symbol, sym) && !pdl->func | |
827 | && EQ (pdl->old_value, Qunbound)) | |
828 | { | |
829 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
830 | SYMBOL_NAME (sym), 1); | |
831 | break; | |
832 | } | |
833 | } | |
834 | } | |
33568849 | 835 | tail = Fcdr (tail); |
e509f168 SM |
836 | tem = Fcar (tail); |
837 | if (!NILP (tem)) | |
33568849 | 838 | { |
33568849 SM |
839 | if (!NILP (Vpurify_flag)) |
840 | tem = Fpurecopy (tem); | |
841 | Fput (sym, Qvariable_documentation, tem); | |
842 | } | |
6fd797f5 | 843 | LOADHIST_ATTACH (sym); |
db9f0278 | 844 | } |
f07a954e SM |
845 | else if (!NILP (Vinternal_interpreter_environment) |
846 | && !XSYMBOL (sym)->declared_special) | |
847 | /* A simple (defvar foo) with lexical scoping does "nothing" except | |
848 | declare that var to be dynamically scoped *locally* (i.e. within | |
849 | the current file or let-block). */ | |
850 | Vinternal_interpreter_environment = | |
851 | Fcons (sym, Vinternal_interpreter_environment); | |
33568849 | 852 | else |
d28a2170 PE |
853 | { |
854 | /* Simple (defvar <var>) should not count as a definition at all. | |
855 | It could get in the way of other definitions, and unloading this | |
856 | package could try to make the variable unbound. */ | |
857 | } | |
addf35fd | 858 | |
db9f0278 JB |
859 | return sym; |
860 | } | |
861 | ||
862 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
863 | doc: /* Define SYMBOL as a constant variable. |
864 | The intent is that neither programs nor users should ever change this value. | |
865 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
866 | If SYMBOL is buffer-local, its default value is what is set; | |
867 | buffer-local values are not affected. | |
868 | DOCSTRING is optional. | |
733f68b6 LT |
869 | |
870 | If SYMBOL has a local binding, then this form sets the local binding's | |
871 | value. However, you should normally not make local bindings for | |
872 | variables defined with this form. | |
7a25dc6d | 873 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 874 | (Lisp_Object args) |
db9f0278 JB |
875 | { |
876 | register Lisp_Object sym, tem; | |
877 | ||
878 | sym = Fcar (args); | |
a42ba017 | 879 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 880 | error ("Too many arguments"); |
a42ba017 | 881 | |
defb1411 | 882 | tem = eval_sub (Fcar (Fcdr (args))); |
1182a7cb DL |
883 | if (!NILP (Vpurify_flag)) |
884 | tem = Fpurecopy (tem); | |
885 | Fset_default (sym, tem); | |
b9598260 | 886 | XSYMBOL (sym)->declared_special = 1; |
db9f0278 | 887 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 888 | if (!NILP (tem)) |
db9f0278 | 889 | { |
265a9e55 | 890 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
891 | tem = Fpurecopy (tem); |
892 | Fput (sym, Qvariable_documentation, tem); | |
893 | } | |
873759d5 | 894 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 895 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
896 | return sym; |
897 | } | |
898 | ||
606cdb89 JB |
899 | /* Error handler used in Fuser_variable_p. */ |
900 | static Lisp_Object | |
d3da34e0 | 901 | user_variable_p_eh (Lisp_Object ignore) |
606cdb89 JB |
902 | { |
903 | return Qnil; | |
904 | } | |
905 | ||
40a69fac SM |
906 | static Lisp_Object |
907 | lisp_indirect_variable (Lisp_Object sym) | |
908 | { | |
cfcbfb1a PE |
909 | struct Lisp_Symbol *s = indirect_variable (XSYMBOL (sym)); |
910 | XSETSYMBOL (sym, s); | |
40a69fac SM |
911 | return sym; |
912 | } | |
913 | ||
db9f0278 | 914 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 915 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 916 | \(The alternative is a variable used internally in a Lisp program.) |
606cdb89 JB |
917 | A variable is a user variable if |
918 | \(1) the first character of its documentation is `*', or | |
919 | \(2) it is customizable (its property list contains a non-nil value | |
920 | of `standard-value' or `custom-autoload'), or | |
921 | \(3) it is an alias for another user variable. | |
922 | Return nil if VARIABLE is an alias and there is a loop in the | |
923 | chain of symbols. */) | |
5842a27b | 924 | (Lisp_Object variable) |
db9f0278 JB |
925 | { |
926 | Lisp_Object documentation; | |
177c0ea7 | 927 | |
5e78e475 RS |
928 | if (!SYMBOLP (variable)) |
929 | return Qnil; | |
930 | ||
606cdb89 | 931 | /* If indirect and there's an alias loop, don't check anything else. */ |
ce5b453a | 932 | if (XSYMBOL (variable)->redirect == SYMBOL_VARALIAS |
40a69fac | 933 | && NILP (internal_condition_case_1 (lisp_indirect_variable, variable, |
bb8e180f | 934 | Qt, user_variable_p_eh))) |
606cdb89 JB |
935 | return Qnil; |
936 | ||
937 | while (1) | |
938 | { | |
939 | documentation = Fget (variable, Qvariable_documentation); | |
940 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
bb8e180f | 941 | return Qt; |
606cdb89 | 942 | if (STRINGP (documentation) |
bb8e180f AS |
943 | && ((unsigned char) SREF (documentation, 0) == '*')) |
944 | return Qt; | |
606cdb89 JB |
945 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ |
946 | if (CONSP (documentation) | |
bb8e180f AS |
947 | && STRINGP (XCAR (documentation)) |
948 | && INTEGERP (XCDR (documentation)) | |
949 | && XINT (XCDR (documentation)) < 0) | |
950 | return Qt; | |
606cdb89 JB |
951 | /* Customizable? See `custom-variable-p'. */ |
952 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
bb8e180f AS |
953 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) |
954 | return Qt; | |
606cdb89 | 955 | |
ce5b453a | 956 | if (!(XSYMBOL (variable)->redirect == SYMBOL_VARALIAS)) |
bb8e180f | 957 | return Qnil; |
606cdb89 JB |
958 | |
959 | /* An indirect variable? Let's follow the chain. */ | |
ce5b453a | 960 | XSETSYMBOL (variable, SYMBOL_ALIAS (XSYMBOL (variable))); |
606cdb89 | 961 | } |
177c0ea7 | 962 | } |
db9f0278 JB |
963 | \f |
964 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
965 | doc: /* Bind variables according to VARLIST then eval BODY. |
966 | The value of the last form in BODY is returned. | |
967 | Each element of VARLIST is a symbol (which is bound to nil) | |
968 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
969 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 970 | usage: (let* VARLIST BODY...) */) |
5842a27b | 971 | (Lisp_Object args) |
db9f0278 | 972 | { |
b9598260 | 973 | Lisp_Object varlist, var, val, elt, lexenv; |
aed13378 | 974 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
975 | struct gcpro gcpro1, gcpro2, gcpro3; |
976 | ||
977 | GCPRO3 (args, elt, varlist); | |
978 | ||
b9598260 SM |
979 | lexenv = Vinternal_interpreter_environment; |
980 | ||
db9f0278 | 981 | varlist = Fcar (args); |
b9598260 | 982 | while (CONSP (varlist)) |
db9f0278 JB |
983 | { |
984 | QUIT; | |
b9598260 SM |
985 | |
986 | elt = XCAR (varlist); | |
90165123 | 987 | if (SYMBOLP (elt)) |
b9598260 SM |
988 | { |
989 | var = elt; | |
990 | val = Qnil; | |
991 | } | |
08564963 | 992 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 993 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
994 | else |
995 | { | |
b9598260 | 996 | var = Fcar (elt); |
defb1411 | 997 | val = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 | 998 | } |
b9598260 | 999 | |
f07a954e SM |
1000 | if (!NILP (lexenv) && SYMBOLP (var) |
1001 | && !XSYMBOL (var)->declared_special | |
1002 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
1003 | /* Lexically bind VAR by adding it to the interpreter's binding |
1004 | alist. */ | |
1005 | { | |
f07a954e SM |
1006 | Lisp_Object newenv |
1007 | = Fcons (Fcons (var, val), Vinternal_interpreter_environment); | |
1008 | if (EQ (Vinternal_interpreter_environment, lexenv)) | |
1009 | /* Save the old lexical environment on the specpdl stack, | |
1010 | but only for the first lexical binding, since we'll never | |
1011 | need to revert to one of the intermediate ones. */ | |
1012 | specbind (Qinternal_interpreter_environment, newenv); | |
1013 | else | |
1014 | Vinternal_interpreter_environment = newenv; | |
db9f0278 | 1015 | } |
b9598260 SM |
1016 | else |
1017 | specbind (var, val); | |
1018 | ||
1019 | varlist = XCDR (varlist); | |
db9f0278 JB |
1020 | } |
1021 | UNGCPRO; | |
1022 | val = Fprogn (Fcdr (args)); | |
1023 | return unbind_to (count, val); | |
1024 | } | |
1025 | ||
1026 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1027 | doc: /* Bind variables according to VARLIST then eval BODY. |
1028 | The value of the last form in BODY is returned. | |
1029 | Each element of VARLIST is a symbol (which is bound to nil) | |
1030 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1031 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 1032 | usage: (let VARLIST BODY...) */) |
5842a27b | 1033 | (Lisp_Object args) |
db9f0278 | 1034 | { |
b9598260 | 1035 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 1036 | register Lisp_Object elt, varlist; |
aed13378 | 1037 | int count = SPECPDL_INDEX (); |
c5101a77 | 1038 | register size_t argnum; |
db9f0278 | 1039 | struct gcpro gcpro1, gcpro2; |
3a7a9129 | 1040 | USE_SAFE_ALLOCA; |
db9f0278 JB |
1041 | |
1042 | varlist = Fcar (args); | |
1043 | ||
f6d62986 | 1044 | /* Make space to hold the values to give the bound variables. */ |
db9f0278 | 1045 | elt = Flength (varlist); |
b72e0717 | 1046 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 | 1047 | |
f6d62986 | 1048 | /* Compute the values and store them in `temps'. */ |
db9f0278 JB |
1049 | |
1050 | GCPRO2 (args, *temps); | |
1051 | gcpro2.nvars = 0; | |
1052 | ||
67ee9f6e | 1053 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
1054 | { |
1055 | QUIT; | |
67ee9f6e | 1056 | elt = XCAR (varlist); |
90165123 | 1057 | if (SYMBOLP (elt)) |
db9f0278 | 1058 | temps [argnum++] = Qnil; |
08564963 | 1059 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1060 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 | 1061 | else |
defb1411 | 1062 | temps [argnum++] = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 JB |
1063 | gcpro2.nvars = argnum; |
1064 | } | |
1065 | UNGCPRO; | |
1066 | ||
b9598260 SM |
1067 | lexenv = Vinternal_interpreter_environment; |
1068 | ||
db9f0278 | 1069 | varlist = Fcar (args); |
67ee9f6e | 1070 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 1071 | { |
b9598260 SM |
1072 | Lisp_Object var; |
1073 | ||
67ee9f6e | 1074 | elt = XCAR (varlist); |
b9598260 | 1075 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 1076 | tem = temps[argnum++]; |
b9598260 | 1077 | |
f07a954e SM |
1078 | if (!NILP (lexenv) && SYMBOLP (var) |
1079 | && !XSYMBOL (var)->declared_special | |
1080 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
1081 | /* Lexically bind VAR by adding it to the lexenv alist. */ |
1082 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 1083 | else |
b9598260 SM |
1084 | /* Dynamically bind VAR. */ |
1085 | specbind (var, tem); | |
db9f0278 JB |
1086 | } |
1087 | ||
b9598260 SM |
1088 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
1089 | /* Instantiate a new lexical environment. */ | |
1090 | specbind (Qinternal_interpreter_environment, lexenv); | |
1091 | ||
db9f0278 | 1092 | elt = Fprogn (Fcdr (args)); |
3a7a9129 | 1093 | SAFE_FREE (); |
db9f0278 JB |
1094 | return unbind_to (count, elt); |
1095 | } | |
1096 | ||
1097 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1098 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1099 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1100 | until TEST returns nil. | |
7a25dc6d | 1101 | usage: (while TEST BODY...) */) |
5842a27b | 1102 | (Lisp_Object args) |
db9f0278 | 1103 | { |
2b9bde76 | 1104 | Lisp_Object test, body; |
db9f0278 JB |
1105 | struct gcpro gcpro1, gcpro2; |
1106 | ||
1107 | GCPRO2 (test, body); | |
1108 | ||
1109 | test = Fcar (args); | |
1110 | body = Fcdr (args); | |
defb1411 | 1111 | while (!NILP (eval_sub (test))) |
db9f0278 JB |
1112 | { |
1113 | QUIT; | |
1114 | Fprogn (body); | |
1115 | } | |
1116 | ||
1117 | UNGCPRO; | |
1118 | return Qnil; | |
1119 | } | |
1120 | ||
1121 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1122 | doc: /* Return result of expanding macros at top level of FORM. |
1123 | If FORM is not a macro call, it is returned unchanged. | |
1124 | Otherwise, the macro is expanded and the expansion is considered | |
1125 | in place of FORM. When a non-macro-call results, it is returned. | |
1126 | ||
1127 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1128 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 1129 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 1130 | { |
23d6b5a6 | 1131 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1132 | register Lisp_Object expander, sym, def, tem; |
1133 | ||
1134 | while (1) | |
1135 | { | |
1136 | /* Come back here each time we expand a macro call, | |
1137 | in case it expands into another macro call. */ | |
90165123 | 1138 | if (!CONSP (form)) |
db9f0278 | 1139 | break; |
23d6b5a6 | 1140 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1141 | def = sym = XCAR (form); |
23d6b5a6 | 1142 | tem = Qnil; |
db9f0278 JB |
1143 | /* Trace symbols aliases to other symbols |
1144 | until we get a symbol that is not an alias. */ | |
90165123 | 1145 | while (SYMBOLP (def)) |
db9f0278 JB |
1146 | { |
1147 | QUIT; | |
23d6b5a6 | 1148 | sym = def; |
79e8bfbf | 1149 | tem = Fassq (sym, environment); |
265a9e55 | 1150 | if (NILP (tem)) |
db9f0278 JB |
1151 | { |
1152 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1153 | if (!EQ (def, Qunbound)) |
1154 | continue; | |
db9f0278 | 1155 | } |
23d6b5a6 | 1156 | break; |
db9f0278 | 1157 | } |
79e8bfbf | 1158 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1159 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1160 | if (NILP (tem)) |
db9f0278 | 1161 | { |
79e8bfbf | 1162 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1163 | Look at its function definition. */ |
90165123 | 1164 | if (EQ (def, Qunbound) || !CONSP (def)) |
f6d62986 | 1165 | /* Not defined or definition not suitable. */ |
db9f0278 | 1166 | break; |
03699b14 | 1167 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1168 | { |
1169 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1170 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1171 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1172 | /* Yes, load it and try again. */ |
1173 | { | |
ca20916b RS |
1174 | struct gcpro gcpro1; |
1175 | GCPRO1 (form); | |
ee9ee63c | 1176 | do_autoload (def, sym); |
ca20916b | 1177 | UNGCPRO; |
ee9ee63c JB |
1178 | continue; |
1179 | } | |
1180 | else | |
db9f0278 | 1181 | break; |
db9f0278 | 1182 | } |
03699b14 | 1183 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1184 | break; |
03699b14 | 1185 | else expander = XCDR (def); |
db9f0278 JB |
1186 | } |
1187 | else | |
1188 | { | |
03699b14 | 1189 | expander = XCDR (tem); |
265a9e55 | 1190 | if (NILP (expander)) |
db9f0278 JB |
1191 | break; |
1192 | } | |
03699b14 | 1193 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1194 | } |
1195 | return form; | |
1196 | } | |
1197 | \f | |
1198 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1199 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1200 | TAG is evalled to get the tag to use; it must not be nil. | |
1201 | ||
1202 | Then the BODY is executed. | |
1d632ccf | 1203 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1204 | If no throw happens, `catch' returns the value of the last BODY form. |
1205 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1206 | usage: (catch TAG BODY...) */) |
5842a27b | 1207 | (Lisp_Object args) |
db9f0278 JB |
1208 | { |
1209 | register Lisp_Object tag; | |
1210 | struct gcpro gcpro1; | |
1211 | ||
1212 | GCPRO1 (args); | |
defb1411 | 1213 | tag = eval_sub (Fcar (args)); |
db9f0278 JB |
1214 | UNGCPRO; |
1215 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1216 | } | |
1217 | ||
1218 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1219 | FUNC should return a Lisp_Object. | |
1220 | This is how catches are done from within C code. */ | |
1221 | ||
1222 | Lisp_Object | |
d3da34e0 | 1223 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1224 | { |
1225 | /* This structure is made part of the chain `catchlist'. */ | |
1226 | struct catchtag c; | |
1227 | ||
1228 | /* Fill in the components of c, and put it on the list. */ | |
1229 | c.next = catchlist; | |
1230 | c.tag = tag; | |
1231 | c.val = Qnil; | |
1232 | c.backlist = backtrace_list; | |
1233 | c.handlerlist = handlerlist; | |
1234 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1235 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1236 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1237 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1238 | c.gcpro = gcprolist; |
bcf28080 | 1239 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1240 | catchlist = &c; |
1241 | ||
1242 | /* Call FUNC. */ | |
1243 | if (! _setjmp (c.jmp)) | |
1244 | c.val = (*func) (arg); | |
1245 | ||
1246 | /* Throw works by a longjmp that comes right here. */ | |
1247 | catchlist = c.next; | |
1248 | return c.val; | |
1249 | } | |
1250 | ||
ba410f40 JB |
1251 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1252 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1253 | |
ba410f40 JB |
1254 | This is the guts Fthrow and Fsignal; they differ only in the way |
1255 | they choose the catch tag to throw to. A catch tag for a | |
1256 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1257 | |
ba410f40 JB |
1258 | Before each catch is discarded, unbind all special bindings and |
1259 | execute all unwind-protect clauses made above that catch. Unwind | |
1260 | the handler stack as we go, so that the proper handlers are in | |
1261 | effect for each unwind-protect clause we run. At the end, restore | |
1262 | some static info saved in CATCH, and longjmp to the location | |
1263 | specified in the | |
1264 | ||
1265 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1266 | |
1267 | static void | |
d3da34e0 | 1268 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 JB |
1269 | { |
1270 | register int last_time; | |
1271 | ||
ba410f40 JB |
1272 | /* Save the value in the tag. */ |
1273 | catch->val = value; | |
1274 | ||
0b31741c | 1275 | /* Restore certain special C variables. */ |
1cdc3155 | 1276 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1277 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1278 | handling_signal = 0; |
69bbd6bd | 1279 | immediate_quit = 0; |
82da7701 | 1280 | |
db9f0278 JB |
1281 | do |
1282 | { | |
1283 | last_time = catchlist == catch; | |
82da7701 JB |
1284 | |
1285 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1286 | handlers. */ |
db9f0278 JB |
1287 | unbind_to (catchlist->pdlcount, Qnil); |
1288 | handlerlist = catchlist->handlerlist; | |
1289 | catchlist = catchlist->next; | |
1290 | } | |
1291 | while (! last_time); | |
1292 | ||
a2a103bb | 1293 | #if HAVE_X_WINDOWS |
88019a63 RS |
1294 | /* If x_catch_errors was done, turn it off now. |
1295 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 | 1296 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
bb8e180f AS |
1297 | The catch must remain in effect during that delicate |
1298 | state. --lorentey */ | |
88019a63 | 1299 | x_fully_uncatch_errors (); |
e6aee454 | 1300 | #endif |
a2a103bb | 1301 | #endif |
88019a63 | 1302 | |
bcf28080 | 1303 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1304 | gcprolist = catch->gcpro; |
15934ffa | 1305 | #ifdef DEBUG_GCPRO |
d8e2b5ba | 1306 | gcpro_level = gcprolist ? gcprolist->level + 1 : 0; |
15934ffa | 1307 | #endif |
db9f0278 JB |
1308 | backtrace_list = catch->backlist; |
1309 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1310 | |
ba410f40 | 1311 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1312 | } |
1313 | ||
16a97296 | 1314 | DEFUE ("throw", Fthrow, Sthrow, 2, 2, 0, |
9dbc9081 PJ |
1315 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1316 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1317 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1318 | { |
1319 | register struct catchtag *c; | |
1320 | ||
8788120f KS |
1321 | if (!NILP (tag)) |
1322 | for (c = catchlist; c; c = c->next) | |
1323 | { | |
1324 | if (EQ (c->tag, tag)) | |
1325 | unwind_to_catch (c, value); | |
1326 | } | |
734d55a2 | 1327 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1328 | } |
1329 | ||
1330 | ||
1331 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1332 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1333 | If BODYFORM completes normally, its value is returned | |
1334 | after executing the UNWINDFORMS. | |
1335 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1336 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1337 | (Lisp_Object args) |
db9f0278 JB |
1338 | { |
1339 | Lisp_Object val; | |
aed13378 | 1340 | int count = SPECPDL_INDEX (); |
db9f0278 | 1341 | |
04b28167 | 1342 | record_unwind_protect (Fprogn, Fcdr (args)); |
defb1411 | 1343 | val = eval_sub (Fcar (args)); |
177c0ea7 | 1344 | return unbind_to (count, val); |
db9f0278 JB |
1345 | } |
1346 | \f | |
1347 | /* Chain of condition handlers currently in effect. | |
1348 | The elements of this chain are contained in the stack frames | |
1349 | of Fcondition_case and internal_condition_case. | |
1350 | When an error is signaled (by calling Fsignal, below), | |
1351 | this chain is searched for an element that applies. */ | |
1352 | ||
1353 | struct handler *handlerlist; | |
1354 | ||
1355 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
9dbc9081 | 1356 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1357 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1358 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1359 | where the BODY is made of Lisp expressions. | |
1360 | ||
1361 | A handler is applicable to an error | |
1362 | if CONDITION-NAME is one of the error's condition names. | |
1363 | If an error happens, the first applicable handler is run. | |
1364 | ||
1365 | The car of a handler may be a list of condition names | |
c997bb25 | 1366 | instead of a single condition name. Then it handles all of them. |
9dbc9081 | 1367 | |
c997bb25 RS |
1368 | When a handler handles an error, control returns to the `condition-case' |
1369 | and it executes the handler's BODY... | |
d0acbbaf | 1370 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1371 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1372 | Then the value of the last BODY form is returned from the `condition-case' |
1373 | expression. | |
9dbc9081 | 1374 | |
9dbc9081 | 1375 | See also the function `signal' for more info. |
2b47b74d | 1376 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1377 | (Lisp_Object args) |
db9f0278 | 1378 | { |
17401c97 GM |
1379 | register Lisp_Object bodyform, handlers; |
1380 | volatile Lisp_Object var; | |
db9f0278 | 1381 | |
82da7701 JB |
1382 | var = Fcar (args); |
1383 | bodyform = Fcar (Fcdr (args)); | |
1384 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1385 | |
1386 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1387 | } | |
1388 | ||
1389 | /* Like Fcondition_case, but the args are separate | |
1390 | rather than passed in a list. Used by Fbyte_code. */ | |
1391 | ||
1392 | Lisp_Object | |
d3da34e0 JB |
1393 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1394 | Lisp_Object handlers) | |
ee830945 RS |
1395 | { |
1396 | Lisp_Object val; | |
1397 | struct catchtag c; | |
1398 | struct handler h; | |
1399 | ||
b7826503 | 1400 | CHECK_SYMBOL (var); |
82da7701 | 1401 | |
2b47b74d | 1402 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1403 | { |
1404 | Lisp_Object tem; | |
2b47b74d | 1405 | tem = XCAR (val); |
5f96776a RS |
1406 | if (! (NILP (tem) |
1407 | || (CONSP (tem) | |
03699b14 KR |
1408 | && (SYMBOLP (XCAR (tem)) |
1409 | || CONSP (XCAR (tem)))))) | |
b189fa66 | 1410 | error ("Invalid condition handler"); |
82da7701 | 1411 | } |
db9f0278 JB |
1412 | |
1413 | c.tag = Qnil; | |
1414 | c.val = Qnil; | |
1415 | c.backlist = backtrace_list; | |
1416 | c.handlerlist = handlerlist; | |
1417 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1418 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1419 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1420 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1421 | c.gcpro = gcprolist; |
bcf28080 | 1422 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1423 | if (_setjmp (c.jmp)) |
1424 | { | |
265a9e55 | 1425 | if (!NILP (h.var)) |
bb8e180f | 1426 | specbind (h.var, c.val); |
9d58218c | 1427 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1428 | |
1429 | /* Note that this just undoes the binding of h.var; whoever | |
1430 | longjumped to us unwound the stack to c.pdlcount before | |
1431 | throwing. */ | |
db9f0278 JB |
1432 | unbind_to (c.pdlcount, Qnil); |
1433 | return val; | |
1434 | } | |
1435 | c.next = catchlist; | |
1436 | catchlist = &c; | |
177c0ea7 | 1437 | |
82da7701 JB |
1438 | h.var = var; |
1439 | h.handler = handlers; | |
db9f0278 | 1440 | h.next = handlerlist; |
db9f0278 JB |
1441 | h.tag = &c; |
1442 | handlerlist = &h; | |
1443 | ||
defb1411 | 1444 | val = eval_sub (bodyform); |
db9f0278 JB |
1445 | catchlist = c.next; |
1446 | handlerlist = h.next; | |
1447 | return val; | |
1448 | } | |
1449 | ||
f029ca5f RS |
1450 | /* Call the function BFUN with no arguments, catching errors within it |
1451 | according to HANDLERS. If there is an error, call HFUN with | |
1452 | one argument which is the data that describes the error: | |
1453 | (SIGNALNAME . DATA) | |
1454 | ||
1455 | HANDLERS can be a list of conditions to catch. | |
1456 | If HANDLERS is Qt, catch all errors. | |
1457 | If HANDLERS is Qerror, catch all errors | |
1458 | but allow the debugger to run if that is enabled. */ | |
1459 | ||
db9f0278 | 1460 | Lisp_Object |
d3da34e0 JB |
1461 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1462 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1463 | { |
1464 | Lisp_Object val; | |
1465 | struct catchtag c; | |
1466 | struct handler h; | |
1467 | ||
88019a63 RS |
1468 | /* Since Fsignal will close off all calls to x_catch_errors, |
1469 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1470 | #if HAVE_X_WINDOWS |
88019a63 | 1471 | if (x_catching_errors ()) |
01591d17 | 1472 | abort (); |
a2a103bb | 1473 | #endif |
01591d17 | 1474 | |
db9f0278 JB |
1475 | c.tag = Qnil; |
1476 | c.val = Qnil; | |
1477 | c.backlist = backtrace_list; | |
1478 | c.handlerlist = handlerlist; | |
1479 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1480 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1481 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1482 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1483 | c.gcpro = gcprolist; |
bcf28080 | 1484 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1485 | if (_setjmp (c.jmp)) |
1486 | { | |
9d58218c | 1487 | return (*hfun) (c.val); |
db9f0278 JB |
1488 | } |
1489 | c.next = catchlist; | |
1490 | catchlist = &c; | |
1491 | h.handler = handlers; | |
1492 | h.var = Qnil; | |
db9f0278 JB |
1493 | h.next = handlerlist; |
1494 | h.tag = &c; | |
1495 | handlerlist = &h; | |
1496 | ||
1497 | val = (*bfun) (); | |
1498 | catchlist = c.next; | |
1499 | handlerlist = h.next; | |
1500 | return val; | |
1501 | } | |
1502 | ||
2659a09f | 1503 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1504 | |
d227775c | 1505 | Lisp_Object |
d3da34e0 JB |
1506 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1507 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1508 | { |
1509 | Lisp_Object val; | |
1510 | struct catchtag c; | |
1511 | struct handler h; | |
1512 | ||
88019a63 RS |
1513 | /* Since Fsignal will close off all calls to x_catch_errors, |
1514 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1515 | #if HAVE_X_WINDOWS |
88019a63 RS |
1516 | if (x_catching_errors ()) |
1517 | abort (); | |
a2a103bb | 1518 | #endif |
88019a63 | 1519 | |
d227775c RS |
1520 | c.tag = Qnil; |
1521 | c.val = Qnil; | |
1522 | c.backlist = backtrace_list; | |
1523 | c.handlerlist = handlerlist; | |
1524 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1525 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1526 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1527 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1528 | c.gcpro = gcprolist; |
bcf28080 | 1529 | c.byte_stack = byte_stack_list; |
d227775c RS |
1530 | if (_setjmp (c.jmp)) |
1531 | { | |
9d58218c | 1532 | return (*hfun) (c.val); |
d227775c RS |
1533 | } |
1534 | c.next = catchlist; | |
1535 | catchlist = &c; | |
1536 | h.handler = handlers; | |
1537 | h.var = Qnil; | |
1538 | h.next = handlerlist; | |
1539 | h.tag = &c; | |
1540 | handlerlist = &h; | |
1541 | ||
1542 | val = (*bfun) (arg); | |
1543 | catchlist = c.next; | |
1544 | handlerlist = h.next; | |
1545 | return val; | |
1546 | } | |
10b29d41 | 1547 | |
53967e09 CY |
1548 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1549 | its arguments. */ | |
1550 | ||
1551 | Lisp_Object | |
178f2507 SM |
1552 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1553 | Lisp_Object arg1, | |
1554 | Lisp_Object arg2, | |
1555 | Lisp_Object handlers, | |
1556 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1557 | { |
1558 | Lisp_Object val; | |
1559 | struct catchtag c; | |
1560 | struct handler h; | |
1561 | ||
1562 | /* Since Fsignal will close off all calls to x_catch_errors, | |
1563 | we will get the wrong results if some are not closed now. */ | |
1564 | #if HAVE_X_WINDOWS | |
1565 | if (x_catching_errors ()) | |
1566 | abort (); | |
1567 | #endif | |
1568 | ||
1569 | c.tag = Qnil; | |
1570 | c.val = Qnil; | |
1571 | c.backlist = backtrace_list; | |
1572 | c.handlerlist = handlerlist; | |
1573 | c.lisp_eval_depth = lisp_eval_depth; | |
1574 | c.pdlcount = SPECPDL_INDEX (); | |
1575 | c.poll_suppress_count = poll_suppress_count; | |
1576 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1577 | c.gcpro = gcprolist; | |
1578 | c.byte_stack = byte_stack_list; | |
1579 | if (_setjmp (c.jmp)) | |
1580 | { | |
1581 | return (*hfun) (c.val); | |
1582 | } | |
1583 | c.next = catchlist; | |
1584 | catchlist = &c; | |
1585 | h.handler = handlers; | |
1586 | h.var = Qnil; | |
1587 | h.next = handlerlist; | |
1588 | h.tag = &c; | |
1589 | handlerlist = &h; | |
1590 | ||
1591 | val = (*bfun) (arg1, arg2); | |
1592 | catchlist = c.next; | |
1593 | handlerlist = h.next; | |
1594 | return val; | |
1595 | } | |
10b29d41 | 1596 | |
2659a09f | 1597 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1598 | and ARGS as second argument. */ |
1599 | ||
1600 | Lisp_Object | |
c5101a77 PE |
1601 | internal_condition_case_n (Lisp_Object (*bfun) (size_t, Lisp_Object *), |
1602 | size_t nargs, | |
178f2507 SM |
1603 | Lisp_Object *args, |
1604 | Lisp_Object handlers, | |
1605 | Lisp_Object (*hfun) (Lisp_Object)) | |
10b29d41 GM |
1606 | { |
1607 | Lisp_Object val; | |
1608 | struct catchtag c; | |
1609 | struct handler h; | |
1610 | ||
88019a63 RS |
1611 | /* Since Fsignal will close off all calls to x_catch_errors, |
1612 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1613 | #if HAVE_X_WINDOWS |
88019a63 RS |
1614 | if (x_catching_errors ()) |
1615 | abort (); | |
a2a103bb | 1616 | #endif |
88019a63 | 1617 | |
10b29d41 GM |
1618 | c.tag = Qnil; |
1619 | c.val = Qnil; | |
1620 | c.backlist = backtrace_list; | |
1621 | c.handlerlist = handlerlist; | |
1622 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1623 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1624 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1625 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1626 | c.gcpro = gcprolist; |
1627 | c.byte_stack = byte_stack_list; | |
1628 | if (_setjmp (c.jmp)) | |
1629 | { | |
1630 | return (*hfun) (c.val); | |
1631 | } | |
1632 | c.next = catchlist; | |
1633 | catchlist = &c; | |
1634 | h.handler = handlers; | |
1635 | h.var = Qnil; | |
1636 | h.next = handlerlist; | |
1637 | h.tag = &c; | |
1638 | handlerlist = &h; | |
1639 | ||
1640 | val = (*bfun) (nargs, args); | |
1641 | catchlist = c.next; | |
1642 | handlerlist = h.next; | |
1643 | return val; | |
1644 | } | |
1645 | ||
d227775c | 1646 | \f |
f57e2426 | 1647 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object, |
bb8e180f | 1648 | Lisp_Object, Lisp_Object); |
e7f7fbaa SM |
1649 | static int maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1650 | Lisp_Object data); | |
db9f0278 | 1651 | |
16a97296 | 1652 | DEFUE ("signal", Fsignal, Ssignal, 2, 2, 0, |
9dbc9081 PJ |
1653 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1654 | This function does not return. | |
1655 | ||
1656 | An error symbol is a symbol with an `error-conditions' property | |
1657 | that is a list of condition names. | |
1658 | A handler for any of those names will get to handle this signal. | |
1659 | The symbol `error' should normally be one of them. | |
1660 | ||
1661 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1662 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1663 | error message is constructed. | |
9dbc9081 PJ |
1664 | If the signal is handled, DATA is made available to the handler. |
1665 | See also the function `condition-case'. */) | |
5842a27b | 1666 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1667 | { |
bfa8ca43 | 1668 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1669 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1670 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1671 | Lisp_Object conditions; |
c11d3d17 | 1672 | Lisp_Object string; |
e7f7fbaa SM |
1673 | Lisp_Object real_error_symbol |
1674 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1675 | register Lisp_Object clause = Qnil; | |
1676 | struct handler *h; | |
a2ff3819 | 1677 | struct backtrace *bp; |
db9f0278 | 1678 | |
346598f1 | 1679 | immediate_quit = handling_signal = 0; |
d063129f | 1680 | abort_on_gc = 0; |
db9f0278 JB |
1681 | if (gc_in_progress || waiting_for_input) |
1682 | abort (); | |
1683 | ||
26631f2b RS |
1684 | #if 0 /* rms: I don't know why this was here, |
1685 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1686 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1687 | if (display_hourglass_p) |
1688 | cancel_hourglass (); | |
48f8dfa3 | 1689 | #endif |
177c0ea7 | 1690 | #endif |
48f8dfa3 | 1691 | |
61ede770 | 1692 | /* This hook is used by edebug. */ |
26631f2b RS |
1693 | if (! NILP (Vsignal_hook_function) |
1694 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1695 | { |
1696 | /* Edebug takes care of restoring these variables when it exits. */ | |
1697 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1698 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1699 | ||
1700 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1701 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1702 | ||
1703 | call2 (Vsignal_hook_function, error_symbol, data); | |
1704 | } | |
61ede770 | 1705 | |
1ea9dec4 | 1706 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1707 | |
a2ff3819 GM |
1708 | /* Remember from where signal was called. Skip over the frame for |
1709 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1710 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1711 | is a memory-full error. */ | |
090a072f | 1712 | Vsignaling_function = Qnil; |
26631f2b | 1713 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1714 | { |
1715 | bp = backtrace_list->next; | |
1716 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1717 | bp = bp->next; | |
1718 | if (bp && bp->function) | |
1719 | Vsignaling_function = *bp->function; | |
1720 | } | |
a2ff3819 | 1721 | |
e7f7fbaa | 1722 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1723 | { |
e7f7fbaa | 1724 | clause = find_handler_clause (h->handler, conditions, |
f01cbfdd | 1725 | error_symbol, data); |
265a9e55 | 1726 | if (!NILP (clause)) |
e7f7fbaa | 1727 | break; |
db9f0278 | 1728 | } |
475545b5 | 1729 | |
e7f7fbaa SM |
1730 | if (/* Don't run the debugger for a memory-full error. |
1731 | (There is no room in memory to do that!) */ | |
1732 | !NILP (error_symbol) | |
1733 | && (!NILP (Vdebug_on_signal) | |
1734 | /* If no handler is present now, try to run the debugger. */ | |
1735 | || NILP (clause) | |
1736 | /* Special handler that means "print a message and run debugger | |
1737 | if requested". */ | |
1738 | || EQ (h->handler, Qerror))) | |
1739 | { | |
1740 | int debugger_called | |
1741 | = maybe_call_debugger (conditions, error_symbol, data); | |
1742 | /* We can't return values to code which signaled an error, but we | |
1743 | can continue code which has signaled a quit. */ | |
1744 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
1745 | return Qnil; | |
475545b5 | 1746 | } |
db9f0278 | 1747 | |
e7f7fbaa SM |
1748 | if (!NILP (clause)) |
1749 | { | |
1750 | Lisp_Object unwind_data | |
1751 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 1752 | |
e7f7fbaa SM |
1753 | h->chosen_clause = clause; |
1754 | unwind_to_catch (h->tag, unwind_data); | |
1755 | } | |
1756 | else | |
1757 | { | |
1758 | if (catchlist != 0) | |
1759 | Fthrow (Qtop_level, Qt); | |
1760 | } | |
c11d3d17 | 1761 | |
1ea9dec4 | 1762 | if (! NILP (error_symbol)) |
c11d3d17 | 1763 | data = Fcons (error_symbol, data); |
475545b5 | 1764 | |
c11d3d17 | 1765 | string = Ferror_message_string (data); |
583f48b9 | 1766 | fatal ("%s", SDATA (string)); |
db9f0278 JB |
1767 | } |
1768 | ||
734d55a2 KS |
1769 | /* Internal version of Fsignal that never returns. |
1770 | Used for anything but Qquit (which can return from Fsignal). */ | |
1771 | ||
1772 | void | |
d3da34e0 | 1773 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1774 | { |
1775 | Fsignal (error_symbol, data); | |
1776 | abort (); | |
1777 | } | |
1778 | ||
1779 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1780 | ||
1781 | void | |
d3da34e0 | 1782 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1783 | { |
1784 | xsignal (error_symbol, Qnil); | |
1785 | } | |
1786 | ||
1787 | void | |
d3da34e0 | 1788 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1789 | { |
1790 | xsignal (error_symbol, list1 (arg)); | |
1791 | } | |
1792 | ||
1793 | void | |
d3da34e0 | 1794 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1795 | { |
1796 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1797 | } | |
1798 | ||
1799 | void | |
d3da34e0 | 1800 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1801 | { |
1802 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1803 | } | |
1804 | ||
1805 | /* Signal `error' with message S, and additional arg ARG. | |
1806 | If ARG is not a genuine list, make it a one-element list. */ | |
1807 | ||
1808 | void | |
a8fe7202 | 1809 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1810 | { |
1811 | Lisp_Object tortoise, hare; | |
1812 | ||
1813 | hare = tortoise = arg; | |
1814 | while (CONSP (hare)) | |
1815 | { | |
1816 | hare = XCDR (hare); | |
1817 | if (!CONSP (hare)) | |
1818 | break; | |
1819 | ||
1820 | hare = XCDR (hare); | |
1821 | tortoise = XCDR (tortoise); | |
1822 | ||
1823 | if (EQ (hare, tortoise)) | |
1824 | break; | |
1825 | } | |
1826 | ||
1827 | if (!NILP (hare)) | |
1828 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1829 | ||
1830 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1831 | } | |
1832 | ||
1833 | ||
e0f24100 | 1834 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1835 | a list containing one of CONDITIONS. */ |
1836 | ||
1837 | static int | |
d3da34e0 | 1838 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1839 | { |
4de86b16 | 1840 | if (NILP (list)) |
128c0f66 RM |
1841 | return 0; |
1842 | if (! CONSP (list)) | |
1843 | return 1; | |
1844 | ||
ab67260b | 1845 | while (CONSP (conditions)) |
128c0f66 | 1846 | { |
ab67260b | 1847 | Lisp_Object this, tail; |
03699b14 KR |
1848 | this = XCAR (conditions); |
1849 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1850 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1851 | return 1; |
03699b14 | 1852 | conditions = XCDR (conditions); |
128c0f66 | 1853 | } |
ab67260b | 1854 | return 0; |
128c0f66 RM |
1855 | } |
1856 | ||
fc950e09 KH |
1857 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1858 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1859 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1860 | |
1861 | static int | |
d3da34e0 | 1862 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1863 | { |
1864 | Lisp_Object tail; | |
1865 | int first_string = 1; | |
1866 | Lisp_Object error_message; | |
1867 | ||
17401c97 GM |
1868 | error_message = Qnil; |
1869 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1870 | { |
03699b14 | 1871 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1872 | { |
1873 | if (first_string) | |
1874 | { | |
1875 | error_message = Ferror_message_string (data); | |
1876 | first_string = 0; | |
1877 | } | |
177c0ea7 | 1878 | |
03699b14 | 1879 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1880 | return 1; |
1881 | } | |
1882 | else | |
1883 | { | |
1884 | Lisp_Object contail; | |
1885 | ||
17401c97 | 1886 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1887 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1888 | return 1; |
1889 | } | |
1890 | } | |
1891 | ||
1892 | return 0; | |
1893 | } | |
1894 | ||
ddaa36e1 AS |
1895 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
1896 | SIG and DATA describe the signal, as in find_handler_clause. */ | |
1897 | ||
1898 | static int | |
d3da34e0 | 1899 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1900 | { |
1901 | Lisp_Object combined_data; | |
1902 | ||
1903 | combined_data = Fcons (sig, data); | |
1904 | ||
1905 | if ( | |
1906 | /* Don't try to run the debugger with interrupts blocked. | |
1907 | The editing loop would return anyway. */ | |
1908 | ! INPUT_BLOCKED_P | |
1909 | /* Does user want to enter debugger for this kind of error? */ | |
1910 | && (EQ (sig, Qquit) | |
1911 | ? debug_on_quit | |
1912 | : wants_debugger (Vdebug_on_error, conditions)) | |
1913 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1914 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1915 | && when_entered_debugger < num_nonmacro_input_events) |
1916 | { | |
1917 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1918 | return 1; | |
1919 | } | |
1920 | ||
1921 | return 0; | |
1922 | } | |
1923 | ||
128c0f66 | 1924 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1925 | There are two ways to pass SIG and DATA: |
9b942ebd | 1926 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1927 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1928 | This is for memory-full errors only. |
1ea9dec4 | 1929 | |
9f5903bb RS |
1930 | We need to increase max_specpdl_size temporarily around |
1931 | anything we do that can push on the specpdl, so as not to get | |
1932 | a second error here in case we're handling specpdl overflow. */ | |
db9f0278 JB |
1933 | |
1934 | static Lisp_Object | |
d3da34e0 JB |
1935 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions, |
1936 | Lisp_Object sig, Lisp_Object data) | |
db9f0278 JB |
1937 | { |
1938 | register Lisp_Object h; | |
db9f0278 | 1939 | |
f01cbfdd RS |
1940 | /* t is used by handlers for all conditions, set up by C code. */ |
1941 | if (EQ (handlers, Qt)) | |
db9f0278 | 1942 | return Qt; |
f01cbfdd | 1943 | |
61ede770 RS |
1944 | /* error is used similarly, but means print an error message |
1945 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1946 | if (EQ (handlers, Qerror)) |
1947 | return Qt; | |
f01cbfdd | 1948 | |
e7f7fbaa | 1949 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1950 | { |
e7f7fbaa SM |
1951 | Lisp_Object handler = XCAR (h); |
1952 | Lisp_Object condit, tem; | |
5f96776a | 1953 | |
5f96776a | 1954 | if (!CONSP (handler)) |
db9f0278 | 1955 | continue; |
e7f7fbaa | 1956 | condit = XCAR (handler); |
5f96776a RS |
1957 | /* Handle a single condition name in handler HANDLER. */ |
1958 | if (SYMBOLP (condit)) | |
1959 | { | |
1960 | tem = Fmemq (Fcar (handler), conditions); | |
1961 | if (!NILP (tem)) | |
1962 | return handler; | |
1963 | } | |
1964 | /* Handle a list of condition names in handler HANDLER. */ | |
1965 | else if (CONSP (condit)) | |
1966 | { | |
f01cbfdd RS |
1967 | Lisp_Object tail; |
1968 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1969 | { |
e7f7fbaa | 1970 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1971 | if (!NILP (tem)) |
e7f7fbaa | 1972 | return handler; |
5f96776a RS |
1973 | } |
1974 | } | |
db9f0278 | 1975 | } |
f01cbfdd | 1976 | |
db9f0278 JB |
1977 | return Qnil; |
1978 | } | |
1979 | ||
db9f0278 | 1980 | |
f6d62986 | 1981 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1982 | void |
b3ffc17c | 1983 | verror (const char *m, va_list ap) |
db9f0278 | 1984 | { |
70476b54 | 1985 | char buf[4000]; |
5fdb398c | 1986 | size_t size = sizeof buf; |
eb3f1cc8 PE |
1987 | size_t size_max = |
1988 | min (MOST_POSITIVE_FIXNUM, min (INT_MAX, SIZE_MAX - 1)) + 1; | |
9125da08 | 1989 | char *buffer = buf; |
5fdb398c | 1990 | int used; |
9125da08 RS |
1991 | Lisp_Object string; |
1992 | ||
db9f0278 | 1993 | while (1) |
9125da08 | 1994 | { |
5fdb398c | 1995 | used = vsnprintf (buffer, size, m, ap); |
eb3f1cc8 | 1996 | |
5fdb398c | 1997 | if (used < 0) |
5ece1728 | 1998 | { |
eb3f1cc8 PE |
1999 | /* Non-C99 vsnprintf, such as w32, returns -1 when SIZE is too small. |
2000 | Guess a larger USED to work around the incompatibility. */ | |
2001 | used = (size <= size_max / 2 ? 2 * size | |
2002 | : size < size_max ? size_max - 1 | |
2003 | : size_max); | |
5ece1728 | 2004 | } |
eb3f1cc8 PE |
2005 | else if (used < size) |
2006 | break; | |
2007 | if (size_max <= used) | |
2008 | memory_full (); | |
2009 | size = used + 1; | |
2010 | ||
2011 | if (buffer != buf) | |
2012 | xfree (buffer); | |
2013 | buffer = (char *) xmalloc (size); | |
9125da08 RS |
2014 | } |
2015 | ||
5fdb398c | 2016 | string = make_string (buffer, used); |
eb3f1cc8 | 2017 | if (buffer != buf) |
9ae6734f | 2018 | xfree (buffer); |
9125da08 | 2019 | |
734d55a2 | 2020 | xsignal1 (Qerror, string); |
db9f0278 | 2021 | } |
b3ffc17c DN |
2022 | |
2023 | ||
f6d62986 | 2024 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
2025 | |
2026 | /* VARARGS 1 */ | |
2027 | void | |
2028 | error (const char *m, ...) | |
2029 | { | |
2030 | va_list ap; | |
2031 | va_start (ap, m); | |
2032 | verror (m, ap); | |
2033 | va_end (ap); | |
2034 | } | |
db9f0278 | 2035 | \f |
16a97296 | 2036 | DEFUE ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
2037 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
2038 | This means it contains a description for how to read arguments to give it. | |
2039 | The value is nil for an invalid function or a symbol with no function | |
2040 | definition. | |
2041 | ||
2042 | Interactively callable functions include strings and vectors (treated | |
2043 | as keyboard macros), lambda-expressions that contain a top-level call | |
2044 | to `interactive', autoload definitions made by `autoload' with non-nil | |
2045 | fourth argument, and some of the built-in functions of Lisp. | |
2046 | ||
e72706be RS |
2047 | Also, a symbol satisfies `commandp' if its function definition does so. |
2048 | ||
2049 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2050 | then strings and vectors are not accepted. */) |
5842a27b | 2051 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
2052 | { |
2053 | register Lisp_Object fun; | |
2054 | register Lisp_Object funcar; | |
52b71f49 | 2055 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2056 | |
2057 | fun = function; | |
2058 | ||
52b71f49 SM |
2059 | fun = indirect_function (fun); /* Check cycles. */ |
2060 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2061 | return Qnil; |
db9f0278 | 2062 | |
52b71f49 SM |
2063 | /* Check an `interactive-form' property if present, analogous to the |
2064 | function-documentation property. */ | |
2065 | fun = function; | |
2066 | while (SYMBOLP (fun)) | |
2067 | { | |
2b9aa051 | 2068 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
2069 | if (!NILP (tmp)) |
2070 | if_prop = Qt; | |
2071 | fun = Fsymbol_function (fun); | |
2072 | } | |
2073 | ||
db9f0278 JB |
2074 | /* Emacs primitives are interactive if their DEFUN specifies an |
2075 | interactive spec. */ | |
90165123 | 2076 | if (SUBRP (fun)) |
04724b69 | 2077 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2078 | |
2079 | /* Bytecode objects are interactive if they are long enough to | |
2080 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2081 | where the interactive spec is stored. */ | |
90165123 | 2082 | else if (COMPILEDP (fun)) |
845975f5 | 2083 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2084 | ? Qt : if_prop); |
db9f0278 JB |
2085 | |
2086 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2087 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2088 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2089 | |
2090 | /* Lists may represent commands. */ | |
2091 | if (!CONSP (fun)) | |
2092 | return Qnil; | |
ed16fb98 | 2093 | funcar = XCAR (fun); |
b38b1ec0 | 2094 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
2095 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
2096 | ? Qt : if_prop); | |
23aba0ea | 2097 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 2098 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 2099 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 2100 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2101 | else |
2102 | return Qnil; | |
2103 | } | |
2104 | ||
db9f0278 | 2105 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
2106 | doc: /* Define FUNCTION to autoload from FILE. |
2107 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2108 | Third arg DOCSTRING is documentation for the function. | |
2109 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2110 | Fifth arg TYPE indicates the type of the object: | |
2111 | nil or omitted says FUNCTION is a function, | |
2112 | `keymap' says FUNCTION is really a keymap, and | |
2113 | `macro' or t says FUNCTION is really a macro. | |
2114 | Third through fifth args give info about the real definition. | |
2115 | They default to nil. | |
2116 | If FUNCTION is already defined other than as an autoload, | |
2117 | this does nothing and returns nil. */) | |
5842a27b | 2118 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 2119 | { |
b7826503 PJ |
2120 | CHECK_SYMBOL (function); |
2121 | CHECK_STRING (file); | |
db9f0278 | 2122 | |
f6d62986 | 2123 | /* If function is defined and not as an autoload, don't override. */ |
db9f0278 | 2124 | if (!EQ (XSYMBOL (function)->function, Qunbound) |
90165123 | 2125 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2126 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2127 | return Qnil; |
2128 | ||
7973e637 SM |
2129 | if (NILP (Vpurify_flag)) |
2130 | /* Only add entries after dumping, because the ones before are | |
2131 | not useful and else we get loads of them from the loaddefs.el. */ | |
2132 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
905a9ed3 | 2133 | else |
a56eaaef | 2134 | /* We don't want the docstring in purespace (instead, |
d6d23852 SM |
2135 | Snarf-documentation should (hopefully) overwrite it). |
2136 | We used to use 0 here, but that leads to accidental sharing in | |
2137 | purecopy's hash-consing, so we use a (hopefully) unique integer | |
2138 | instead. */ | |
2139 | docstring = make_number (XHASH (function)); | |
a56eaaef DN |
2140 | return Ffset (function, |
2141 | Fpurecopy (list5 (Qautoload, file, docstring, | |
2142 | interactive, type))); | |
db9f0278 JB |
2143 | } |
2144 | ||
2145 | Lisp_Object | |
d3da34e0 | 2146 | un_autoload (Lisp_Object oldqueue) |
db9f0278 JB |
2147 | { |
2148 | register Lisp_Object queue, first, second; | |
2149 | ||
2150 | /* Queue to unwind is current value of Vautoload_queue. | |
2151 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2152 | queue = Vautoload_queue; | |
2153 | Vautoload_queue = oldqueue; | |
2154 | while (CONSP (queue)) | |
2155 | { | |
e509f168 | 2156 | first = XCAR (queue); |
db9f0278 JB |
2157 | second = Fcdr (first); |
2158 | first = Fcar (first); | |
47b82df9 RS |
2159 | if (EQ (first, make_number (0))) |
2160 | Vfeatures = second; | |
db9f0278 JB |
2161 | else |
2162 | Ffset (first, second); | |
e509f168 | 2163 | queue = XCDR (queue); |
db9f0278 JB |
2164 | } |
2165 | return Qnil; | |
2166 | } | |
2167 | ||
ca20916b RS |
2168 | /* Load an autoloaded function. |
2169 | FUNNAME is the symbol which is the function's name. | |
2170 | FUNDEF is the autoload definition (a list). */ | |
2171 | ||
045ba794 | 2172 | void |
d3da34e0 | 2173 | do_autoload (Lisp_Object fundef, Lisp_Object funname) |
db9f0278 | 2174 | { |
aed13378 | 2175 | int count = SPECPDL_INDEX (); |
d945992e | 2176 | Lisp_Object fun; |
ca20916b | 2177 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2178 | |
aea6173f RS |
2179 | /* This is to make sure that loadup.el gives a clear picture |
2180 | of what files are preloaded and when. */ | |
ab4db096 RS |
2181 | if (! NILP (Vpurify_flag)) |
2182 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2183 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2184 | |
db9f0278 | 2185 | fun = funname; |
b7826503 | 2186 | CHECK_SYMBOL (funname); |
ca20916b | 2187 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2188 | |
f87740dc | 2189 | /* Preserve the match data. */ |
89f2614d | 2190 | record_unwind_save_match_data (); |
177c0ea7 | 2191 | |
a04ee161 RS |
2192 | /* If autoloading gets an error (which includes the error of failing |
2193 | to define the function being called), we use Vautoload_queue | |
2194 | to undo function definitions and `provide' calls made by | |
2195 | the function. We do this in the specific case of autoloading | |
2196 | because autoloading is not an explicit request "load this file", | |
2197 | but rather a request to "call this function". | |
d3da34e0 | 2198 | |
a04ee161 | 2199 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
2200 | record_unwind_protect (un_autoload, Vautoload_queue); |
2201 | Vautoload_queue = Qt; | |
7351b242 | 2202 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2203 | |
db9f0278 JB |
2204 | /* Once loading finishes, don't undo it. */ |
2205 | Vautoload_queue = Qt; | |
2206 | unbind_to (count, Qnil); | |
2207 | ||
a7f96a35 | 2208 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2209 | |
76c2b0cc | 2210 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2211 | error ("Autoloading failed to define function %s", |
d5db4077 | 2212 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2213 | UNGCPRO; |
db9f0278 | 2214 | } |
4c576a83 | 2215 | |
db9f0278 | 2216 | \f |
16a97296 | 2217 | DEFUE ("eval", Feval, Seval, 1, 2, 0, |
a0ee6f27 SM |
2218 | doc: /* Evaluate FORM and return its value. |
2219 | If LEXICAL is t, evaluate using lexical scoping. */) | |
2220 | (Lisp_Object form, Lisp_Object lexical) | |
defb1411 SM |
2221 | { |
2222 | int count = SPECPDL_INDEX (); | |
a0ee6f27 SM |
2223 | specbind (Qinternal_interpreter_environment, |
2224 | NILP (lexical) ? Qnil : Fcons (Qt, Qnil)); | |
defb1411 SM |
2225 | return unbind_to (count, eval_sub (form)); |
2226 | } | |
2227 | ||
2228 | /* Eval a sub-expression of the current expression (i.e. in the same | |
2229 | lexical scope). */ | |
2230 | Lisp_Object | |
2231 | eval_sub (Lisp_Object form) | |
db9f0278 JB |
2232 | { |
2233 | Lisp_Object fun, val, original_fun, original_args; | |
2234 | Lisp_Object funcar; | |
2235 | struct backtrace backtrace; | |
2236 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2237 | ||
df470e3b | 2238 | if (handling_signal) |
48f8dfa3 | 2239 | abort (); |
177c0ea7 | 2240 | |
90165123 | 2241 | if (SYMBOLP (form)) |
b9598260 | 2242 | { |
f07a954e SM |
2243 | /* Look up its binding in the lexical environment. |
2244 | We do not pay attention to the declared_special flag here, since we | |
2245 | already did that when let-binding the variable. */ | |
2246 | Lisp_Object lex_binding | |
2247 | = !NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
2248 | ? Fassq (form, Vinternal_interpreter_environment) | |
2249 | : Qnil; | |
2250 | if (CONSP (lex_binding)) | |
2251 | return XCDR (lex_binding); | |
2252 | else | |
2253 | return Fsymbol_value (form); | |
b9598260 SM |
2254 | } |
2255 | ||
db9f0278 JB |
2256 | if (!CONSP (form)) |
2257 | return form; | |
2258 | ||
2259 | QUIT; | |
ee830945 RS |
2260 | if ((consing_since_gc > gc_cons_threshold |
2261 | && consing_since_gc > gc_relative_threshold) | |
2262 | || | |
2263 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2264 | { |
2265 | GCPRO1 (form); | |
2266 | Fgarbage_collect (); | |
2267 | UNGCPRO; | |
2268 | } | |
2269 | ||
2270 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2271 | { | |
2272 | if (max_lisp_eval_depth < 100) | |
2273 | max_lisp_eval_depth = 100; | |
2274 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2275 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2276 | } |
2277 | ||
2278 | original_fun = Fcar (form); | |
2279 | original_args = Fcdr (form); | |
2280 | ||
2281 | backtrace.next = backtrace_list; | |
2282 | backtrace_list = &backtrace; | |
f6d62986 | 2283 | backtrace.function = &original_fun; /* This also protects them from gc. */ |
db9f0278 JB |
2284 | backtrace.args = &original_args; |
2285 | backtrace.nargs = UNEVALLED; | |
2286 | backtrace.evalargs = 1; | |
2287 | backtrace.debug_on_exit = 0; | |
2288 | ||
2289 | if (debug_on_next_call) | |
2290 | do_debug_on_call (Qt); | |
2291 | ||
2292 | /* At this point, only original_fun and original_args | |
f6d62986 | 2293 | have values that will be used below. */ |
db9f0278 | 2294 | retry: |
8788120f KS |
2295 | |
2296 | /* Optimize for no indirection. */ | |
2297 | fun = original_fun; | |
2298 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2299 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2300 | fun = indirect_function (fun); | |
db9f0278 | 2301 | |
90165123 | 2302 | if (SUBRP (fun)) |
db9f0278 JB |
2303 | { |
2304 | Lisp_Object numargs; | |
166c822d | 2305 | Lisp_Object argvals[8]; |
db9f0278 JB |
2306 | Lisp_Object args_left; |
2307 | register int i, maxargs; | |
2308 | ||
2309 | args_left = original_args; | |
2310 | numargs = Flength (args_left); | |
2311 | ||
c1788fbc RS |
2312 | CHECK_CONS_LIST (); |
2313 | ||
f6d62986 SM |
2314 | if (XINT (numargs) < XSUBR (fun)->min_args |
2315 | || (XSUBR (fun)->max_args >= 0 | |
2316 | && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2317 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2318 | |
ef1b0ba7 | 2319 | else if (XSUBR (fun)->max_args == UNEVALLED) |
db9f0278 JB |
2320 | { |
2321 | backtrace.evalargs = 0; | |
d5273788 | 2322 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
db9f0278 | 2323 | } |
ef1b0ba7 | 2324 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 | 2325 | { |
f6d62986 | 2326 | /* Pass a vector of evaluated arguments. */ |
db9f0278 | 2327 | Lisp_Object *vals; |
c5101a77 | 2328 | register size_t argnum = 0; |
3a7a9129 | 2329 | USE_SAFE_ALLOCA; |
db9f0278 | 2330 | |
b72e0717 | 2331 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2332 | |
2333 | GCPRO3 (args_left, fun, fun); | |
2334 | gcpro3.var = vals; | |
2335 | gcpro3.nvars = 0; | |
2336 | ||
265a9e55 | 2337 | while (!NILP (args_left)) |
db9f0278 | 2338 | { |
defb1411 | 2339 | vals[argnum++] = eval_sub (Fcar (args_left)); |
db9f0278 JB |
2340 | args_left = Fcdr (args_left); |
2341 | gcpro3.nvars = argnum; | |
2342 | } | |
db9f0278 JB |
2343 | |
2344 | backtrace.args = vals; | |
2345 | backtrace.nargs = XINT (numargs); | |
2346 | ||
d5273788 | 2347 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2348 | UNGCPRO; |
3a7a9129 | 2349 | SAFE_FREE (); |
db9f0278 | 2350 | } |
ef1b0ba7 | 2351 | else |
db9f0278 | 2352 | { |
ef1b0ba7 SM |
2353 | GCPRO3 (args_left, fun, fun); |
2354 | gcpro3.var = argvals; | |
2355 | gcpro3.nvars = 0; | |
db9f0278 | 2356 | |
ef1b0ba7 SM |
2357 | maxargs = XSUBR (fun)->max_args; |
2358 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2359 | { | |
a0ee6f27 | 2360 | argvals[i] = eval_sub (Fcar (args_left)); |
ef1b0ba7 SM |
2361 | gcpro3.nvars = ++i; |
2362 | } | |
db9f0278 | 2363 | |
ef1b0ba7 | 2364 | UNGCPRO; |
db9f0278 | 2365 | |
ef1b0ba7 SM |
2366 | backtrace.args = argvals; |
2367 | backtrace.nargs = XINT (numargs); | |
2368 | ||
2369 | switch (i) | |
2370 | { | |
2371 | case 0: | |
2372 | val = (XSUBR (fun)->function.a0 ()); | |
2373 | break; | |
2374 | case 1: | |
2375 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2376 | break; | |
2377 | case 2: | |
2378 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2379 | break; | |
2380 | case 3: | |
2381 | val = (XSUBR (fun)->function.a3 | |
2382 | (argvals[0], argvals[1], argvals[2])); | |
2383 | break; | |
2384 | case 4: | |
2385 | val = (XSUBR (fun)->function.a4 | |
2386 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2387 | break; | |
2388 | case 5: | |
2389 | val = (XSUBR (fun)->function.a5 | |
2390 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2391 | argvals[4])); | |
2392 | break; | |
2393 | case 6: | |
2394 | val = (XSUBR (fun)->function.a6 | |
2395 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2396 | argvals[4], argvals[5])); | |
2397 | break; | |
2398 | case 7: | |
2399 | val = (XSUBR (fun)->function.a7 | |
2400 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2401 | argvals[4], argvals[5], argvals[6])); | |
2402 | break; | |
2403 | ||
2404 | case 8: | |
2405 | val = (XSUBR (fun)->function.a8 | |
2406 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2407 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2408 | break; | |
2409 | ||
2410 | default: | |
2411 | /* Someone has created a subr that takes more arguments than | |
2412 | is supported by this code. We need to either rewrite the | |
2413 | subr to use a different argument protocol, or add more | |
2414 | cases to this switch. */ | |
2415 | abort (); | |
2416 | } | |
db9f0278 JB |
2417 | } |
2418 | } | |
ef1b0ba7 | 2419 | else if (COMPILEDP (fun)) |
defb1411 | 2420 | val = apply_lambda (fun, original_args); |
db9f0278 JB |
2421 | else |
2422 | { | |
8788120f | 2423 | if (EQ (fun, Qunbound)) |
734d55a2 | 2424 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2425 | if (!CONSP (fun)) |
734d55a2 KS |
2426 | xsignal1 (Qinvalid_function, original_fun); |
2427 | funcar = XCAR (fun); | |
90165123 | 2428 | if (!SYMBOLP (funcar)) |
734d55a2 | 2429 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2430 | if (EQ (funcar, Qautoload)) |
2431 | { | |
2432 | do_autoload (fun, original_fun); | |
2433 | goto retry; | |
2434 | } | |
2435 | if (EQ (funcar, Qmacro)) | |
defb1411 SM |
2436 | val = eval_sub (apply1 (Fcdr (fun), original_args)); |
2437 | else if (EQ (funcar, Qlambda) | |
2438 | || EQ (funcar, Qclosure)) | |
2439 | val = apply_lambda (fun, original_args); | |
db9f0278 | 2440 | else |
734d55a2 | 2441 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2442 | } |
c1788fbc RS |
2443 | CHECK_CONS_LIST (); |
2444 | ||
db9f0278 JB |
2445 | lisp_eval_depth--; |
2446 | if (backtrace.debug_on_exit) | |
2447 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2448 | backtrace_list = backtrace.next; | |
824eb35e | 2449 | |
db9f0278 JB |
2450 | return val; |
2451 | } | |
2452 | \f | |
16a97296 | 2453 | DEFUE ("apply", Fapply, Sapply, 2, MANY, 0, |
9dbc9081 PJ |
2454 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2455 | Then return the value FUNCTION returns. | |
2456 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2457 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
c5101a77 | 2458 | (size_t nargs, Lisp_Object *args) |
db9f0278 | 2459 | { |
c5101a77 | 2460 | register size_t i, numargs; |
db9f0278 JB |
2461 | register Lisp_Object spread_arg; |
2462 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2463 | Lisp_Object fun, retval; |
96d44c64 | 2464 | struct gcpro gcpro1; |
3a7a9129 | 2465 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2466 | |
2467 | fun = args [0]; | |
2468 | funcall_args = 0; | |
2469 | spread_arg = args [nargs - 1]; | |
b7826503 | 2470 | CHECK_LIST (spread_arg); |
177c0ea7 | 2471 | |
db9f0278 JB |
2472 | numargs = XINT (Flength (spread_arg)); |
2473 | ||
2474 | if (numargs == 0) | |
2475 | return Ffuncall (nargs - 1, args); | |
2476 | else if (numargs == 1) | |
2477 | { | |
03699b14 | 2478 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2479 | return Ffuncall (nargs, args); |
2480 | } | |
2481 | ||
a6e3fa71 | 2482 | numargs += nargs - 2; |
db9f0278 | 2483 | |
8788120f KS |
2484 | /* Optimize for no indirection. */ |
2485 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2486 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2487 | fun = indirect_function (fun); | |
ffd56f97 | 2488 | if (EQ (fun, Qunbound)) |
db9f0278 | 2489 | { |
f6d62986 | 2490 | /* Let funcall get the error. */ |
ffd56f97 JB |
2491 | fun = args[0]; |
2492 | goto funcall; | |
db9f0278 JB |
2493 | } |
2494 | ||
90165123 | 2495 | if (SUBRP (fun)) |
db9f0278 JB |
2496 | { |
2497 | if (numargs < XSUBR (fun)->min_args | |
2498 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
f6d62986 | 2499 | goto funcall; /* Let funcall get the error. */ |
c5101a77 | 2500 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2501 | { |
2502 | /* Avoid making funcall cons up a yet another new vector of arguments | |
f6d62986 | 2503 | by explicitly supplying nil's for optional values. */ |
b72e0717 | 2504 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2505 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2506 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2507 | GCPRO1 (*funcall_args); |
2508 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2509 | } |
2510 | } | |
2511 | funcall: | |
2512 | /* We add 1 to numargs because funcall_args includes the | |
2513 | function itself as well as its arguments. */ | |
2514 | if (!funcall_args) | |
a6e3fa71 | 2515 | { |
b72e0717 | 2516 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2517 | GCPRO1 (*funcall_args); |
2518 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2519 | } |
2520 | ||
72af86bd | 2521 | memcpy (funcall_args, args, nargs * sizeof (Lisp_Object)); |
db9f0278 JB |
2522 | /* Spread the last arg we got. Its first element goes in |
2523 | the slot that it used to occupy, hence this value of I. */ | |
2524 | i = nargs - 1; | |
265a9e55 | 2525 | while (!NILP (spread_arg)) |
db9f0278 | 2526 | { |
03699b14 KR |
2527 | funcall_args [i++] = XCAR (spread_arg); |
2528 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2529 | } |
a6e3fa71 | 2530 | |
96d44c64 | 2531 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2532 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2533 | UNGCPRO; | |
2534 | SAFE_FREE (); | |
2535 | ||
2536 | return retval; | |
db9f0278 JB |
2537 | } |
2538 | \f | |
ff936e53 SM |
2539 | /* Run hook variables in various ways. */ |
2540 | ||
f6d62986 | 2541 | static Lisp_Object |
82892965 | 2542 | funcall_nil (size_t nargs, Lisp_Object *args) |
f6d62986 SM |
2543 | { |
2544 | Ffuncall (nargs, args); | |
2545 | return Qnil; | |
2546 | } | |
ff936e53 | 2547 | |
16a97296 | 2548 | DEFUE ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2549 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2550 | Each argument should be a symbol, a hook variable. |
2551 | These symbols are processed in the order specified. | |
2552 | If a hook symbol has a non-nil value, that value may be a function | |
2553 | or a list of functions to be called to run the hook. | |
2554 | If the value is a function, it is called with no arguments. | |
2555 | If it is a list, the elements are called, in order, with no arguments. | |
2556 | ||
9f685258 LK |
2557 | Major modes should not use this function directly to run their mode |
2558 | hook; they should use `run-mode-hooks' instead. | |
2559 | ||
72e85d5d RS |
2560 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2561 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2562 | usage: (run-hooks &rest HOOKS) */) |
c5101a77 | 2563 | (size_t nargs, Lisp_Object *args) |
ff936e53 SM |
2564 | { |
2565 | Lisp_Object hook[1]; | |
c5101a77 | 2566 | register size_t i; |
ff936e53 SM |
2567 | |
2568 | for (i = 0; i < nargs; i++) | |
2569 | { | |
2570 | hook[0] = args[i]; | |
f6d62986 | 2571 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
2572 | } |
2573 | ||
2574 | return Qnil; | |
2575 | } | |
177c0ea7 | 2576 | |
16a97296 | 2577 | DEFUE ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2578 | Srun_hook_with_args, 1, MANY, 0, |
2579 | doc: /* Run HOOK with the specified arguments ARGS. | |
2580 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2581 | value, that value may be a function or a list of functions to be | |
2582 | called to run the hook. If the value is a function, it is called with | |
2583 | the given arguments and its return value is returned. If it is a list | |
2584 | of functions, those functions are called, in order, | |
2585 | with the given arguments ARGS. | |
d5e2c90c | 2586 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2587 | as that may change. |
2588 | ||
72e85d5d RS |
2589 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2590 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2591 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
c5101a77 | 2592 | (size_t nargs, Lisp_Object *args) |
ff936e53 | 2593 | { |
f6d62986 | 2594 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
2595 | } |
2596 | ||
a0d76c27 | 2597 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2598 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2599 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2600 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2601 | value, that value may be a function or a list of functions to be | |
2602 | called to run the hook. If the value is a function, it is called with | |
2603 | the given arguments and its return value is returned. | |
2604 | If it is a list of functions, those functions are called, in order, | |
2605 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2606 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2607 | However, if they all return nil, we return nil. |
9dbc9081 | 2608 | |
72e85d5d RS |
2609 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2610 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2611 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
c5101a77 | 2612 | (size_t nargs, Lisp_Object *args) |
b0b667cb | 2613 | { |
f6d62986 SM |
2614 | return run_hook_with_args (nargs, args, Ffuncall); |
2615 | } | |
2616 | ||
2617 | static Lisp_Object | |
82892965 | 2618 | funcall_not (size_t nargs, Lisp_Object *args) |
f6d62986 SM |
2619 | { |
2620 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
2621 | } |
2622 | ||
16a97296 | 2623 | DEFUE ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2624 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2625 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2626 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2627 | value, that value may be a function or a list of functions to be | |
2628 | called to run the hook. If the value is a function, it is called with | |
2629 | the given arguments and its return value is returned. | |
2630 | If it is a list of functions, those functions are called, in order, | |
2631 | with the given arguments ARGS, until one of them returns nil. | |
2632 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2633 | |
72e85d5d RS |
2634 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2635 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2636 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
c5101a77 | 2637 | (size_t nargs, Lisp_Object *args) |
ff936e53 | 2638 | { |
f6d62986 | 2639 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
2640 | } |
2641 | ||
f6d62986 | 2642 | static Lisp_Object |
82892965 | 2643 | run_hook_wrapped_funcall (size_t nargs, Lisp_Object *args) |
f6d62986 SM |
2644 | { |
2645 | Lisp_Object tmp = args[0], ret; | |
2646 | args[0] = args[1]; | |
2647 | args[1] = tmp; | |
2648 | ret = Ffuncall (nargs, args); | |
2649 | args[1] = args[0]; | |
2650 | args[0] = tmp; | |
2651 | return ret; | |
2652 | } | |
2653 | ||
2654 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
2655 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
2656 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
2657 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
2658 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
2659 | aborts and returns that value. | |
2660 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
82892965 | 2661 | (size_t nargs, Lisp_Object *args) |
f6d62986 SM |
2662 | { |
2663 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
2664 | } | |
ff936e53 | 2665 | |
c933ea05 RS |
2666 | /* ARGS[0] should be a hook symbol. |
2667 | Call each of the functions in the hook value, passing each of them | |
2668 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 2669 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
2670 | The caller (or its caller, etc) must gcpro all of ARGS, |
2671 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2672 | ||
f6d62986 | 2673 | Lisp_Object |
c5101a77 | 2674 | run_hook_with_args (size_t nargs, Lisp_Object *args, |
82892965 | 2675 | Lisp_Object (*funcall) (size_t nargs, Lisp_Object *args)) |
ff936e53 | 2676 | { |
f6d62986 | 2677 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 2678 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2679 | |
f029ca5f RS |
2680 | /* If we are dying or still initializing, |
2681 | don't do anything--it would probably crash if we tried. */ | |
2682 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2683 | return Qnil; |
f029ca5f | 2684 | |
b0b667cb | 2685 | sym = args[0]; |
aa681b51 | 2686 | val = find_symbol_value (sym); |
ff936e53 | 2687 | |
b0b667cb | 2688 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2689 | return ret; |
03699b14 | 2690 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2691 | { |
2692 | args[0] = val; | |
f6d62986 | 2693 | return funcall (nargs, args); |
b0b667cb KH |
2694 | } |
2695 | else | |
2696 | { | |
1faed8ae PE |
2697 | Lisp_Object global_vals = Qnil; |
2698 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2699 | |
ff936e53 | 2700 | for (; |
f6d62986 | 2701 | CONSP (val) && NILP (ret); |
03699b14 | 2702 | val = XCDR (val)) |
b0b667cb | 2703 | { |
03699b14 | 2704 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2705 | { |
2706 | /* t indicates this hook has a local binding; | |
2707 | it means to run the global binding too. */ | |
1faed8ae PE |
2708 | global_vals = Fdefault_value (sym); |
2709 | if (NILP (global_vals)) continue; | |
b0b667cb | 2710 | |
1faed8ae | 2711 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2712 | { |
1faed8ae | 2713 | args[0] = global_vals; |
f6d62986 | 2714 | ret = funcall (nargs, args); |
8932b1c2 CY |
2715 | } |
2716 | else | |
2717 | { | |
2718 | for (; | |
f6d62986 | 2719 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 2720 | global_vals = XCDR (global_vals)) |
8932b1c2 | 2721 | { |
1faed8ae | 2722 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2723 | /* In a global value, t should not occur. If it does, we |
2724 | must ignore it to avoid an endless loop. */ | |
2725 | if (!EQ (args[0], Qt)) | |
f6d62986 | 2726 | ret = funcall (nargs, args); |
8932b1c2 | 2727 | } |
b0b667cb KH |
2728 | } |
2729 | } | |
2730 | else | |
2731 | { | |
03699b14 | 2732 | args[0] = XCAR (val); |
f6d62986 | 2733 | ret = funcall (nargs, args); |
b0b667cb KH |
2734 | } |
2735 | } | |
cb9d21f8 RS |
2736 | |
2737 | UNGCPRO; | |
ff936e53 | 2738 | return ret; |
b0b667cb KH |
2739 | } |
2740 | } | |
c933ea05 | 2741 | |
7d48558f RS |
2742 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2743 | ||
2744 | void | |
d3da34e0 | 2745 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2746 | { |
2747 | Lisp_Object temp[3]; | |
2748 | temp[0] = hook; | |
2749 | temp[1] = arg1; | |
2750 | temp[2] = arg2; | |
2751 | ||
2752 | Frun_hook_with_args (3, temp); | |
2753 | } | |
ff936e53 | 2754 | \f |
f6d62986 | 2755 | /* Apply fn to arg. */ |
db9f0278 | 2756 | Lisp_Object |
d3da34e0 | 2757 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2758 | { |
a6e3fa71 JB |
2759 | struct gcpro gcpro1; |
2760 | ||
2761 | GCPRO1 (fn); | |
265a9e55 | 2762 | if (NILP (arg)) |
a6e3fa71 JB |
2763 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2764 | gcpro1.nvars = 2; | |
db9f0278 JB |
2765 | { |
2766 | Lisp_Object args[2]; | |
2767 | args[0] = fn; | |
2768 | args[1] = arg; | |
a6e3fa71 JB |
2769 | gcpro1.var = args; |
2770 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2771 | } |
db9f0278 JB |
2772 | } |
2773 | ||
f6d62986 | 2774 | /* Call function fn on no arguments. */ |
db9f0278 | 2775 | Lisp_Object |
d3da34e0 | 2776 | call0 (Lisp_Object fn) |
db9f0278 | 2777 | { |
a6e3fa71 JB |
2778 | struct gcpro gcpro1; |
2779 | ||
2780 | GCPRO1 (fn); | |
2781 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2782 | } |
2783 | ||
f6d62986 | 2784 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
2785 | /* ARGSUSED */ |
2786 | Lisp_Object | |
d3da34e0 | 2787 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2788 | { |
a6e3fa71 | 2789 | struct gcpro gcpro1; |
177c0ea7 | 2790 | Lisp_Object args[2]; |
a6e3fa71 | 2791 | |
db9f0278 | 2792 | args[0] = fn; |
15285f9f | 2793 | args[1] = arg1; |
a6e3fa71 JB |
2794 | GCPRO1 (args[0]); |
2795 | gcpro1.nvars = 2; | |
2796 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2797 | } |
2798 | ||
f6d62986 | 2799 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
2800 | /* ARGSUSED */ |
2801 | Lisp_Object | |
d3da34e0 | 2802 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2803 | { |
a6e3fa71 | 2804 | struct gcpro gcpro1; |
db9f0278 JB |
2805 | Lisp_Object args[3]; |
2806 | args[0] = fn; | |
15285f9f RS |
2807 | args[1] = arg1; |
2808 | args[2] = arg2; | |
a6e3fa71 JB |
2809 | GCPRO1 (args[0]); |
2810 | gcpro1.nvars = 3; | |
2811 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2812 | } |
2813 | ||
f6d62986 | 2814 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
2815 | /* ARGSUSED */ |
2816 | Lisp_Object | |
d3da34e0 | 2817 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2818 | { |
a6e3fa71 | 2819 | struct gcpro gcpro1; |
db9f0278 JB |
2820 | Lisp_Object args[4]; |
2821 | args[0] = fn; | |
15285f9f RS |
2822 | args[1] = arg1; |
2823 | args[2] = arg2; | |
2824 | args[3] = arg3; | |
a6e3fa71 JB |
2825 | GCPRO1 (args[0]); |
2826 | gcpro1.nvars = 4; | |
2827 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2828 | } |
2829 | ||
f6d62986 | 2830 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
2831 | /* ARGSUSED */ |
2832 | Lisp_Object | |
d3da34e0 JB |
2833 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2834 | Lisp_Object arg4) | |
a5a44b91 JB |
2835 | { |
2836 | struct gcpro gcpro1; | |
a5a44b91 JB |
2837 | Lisp_Object args[5]; |
2838 | args[0] = fn; | |
15285f9f RS |
2839 | args[1] = arg1; |
2840 | args[2] = arg2; | |
2841 | args[3] = arg3; | |
2842 | args[4] = arg4; | |
a5a44b91 JB |
2843 | GCPRO1 (args[0]); |
2844 | gcpro1.nvars = 5; | |
2845 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2846 | } |
2847 | ||
f6d62986 | 2848 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
2849 | /* ARGSUSED */ |
2850 | Lisp_Object | |
d3da34e0 JB |
2851 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2852 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2853 | { |
2854 | struct gcpro gcpro1; | |
15285f9f RS |
2855 | Lisp_Object args[6]; |
2856 | args[0] = fn; | |
2857 | args[1] = arg1; | |
2858 | args[2] = arg2; | |
2859 | args[3] = arg3; | |
2860 | args[4] = arg4; | |
2861 | args[5] = arg5; | |
2862 | GCPRO1 (args[0]); | |
2863 | gcpro1.nvars = 6; | |
2864 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2865 | } |
2866 | ||
f6d62986 | 2867 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
2868 | /* ARGSUSED */ |
2869 | Lisp_Object | |
d3da34e0 JB |
2870 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2871 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2872 | { |
2873 | struct gcpro gcpro1; | |
15285f9f RS |
2874 | Lisp_Object args[7]; |
2875 | args[0] = fn; | |
2876 | args[1] = arg1; | |
2877 | args[2] = arg2; | |
2878 | args[3] = arg3; | |
2879 | args[4] = arg4; | |
2880 | args[5] = arg5; | |
2881 | args[6] = arg6; | |
2882 | GCPRO1 (args[0]); | |
2883 | gcpro1.nvars = 7; | |
2884 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2885 | } |
2886 | ||
f6d62986 | 2887 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
2888 | /* ARGSUSED */ |
2889 | Lisp_Object | |
d3da34e0 JB |
2890 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2891 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2892 | { |
2893 | struct gcpro gcpro1; | |
574c05e2 KK |
2894 | Lisp_Object args[8]; |
2895 | args[0] = fn; | |
2896 | args[1] = arg1; | |
2897 | args[2] = arg2; | |
2898 | args[3] = arg3; | |
2899 | args[4] = arg4; | |
2900 | args[5] = arg5; | |
2901 | args[6] = arg6; | |
2902 | args[7] = arg7; | |
2903 | GCPRO1 (args[0]); | |
2904 | gcpro1.nvars = 8; | |
2905 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2906 | } |
2907 | ||
6c2ef893 RS |
2908 | /* The caller should GCPRO all the elements of ARGS. */ |
2909 | ||
16a97296 | 2910 | DEFUE ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 2911 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 2912 | (Lisp_Object object) |
b9598260 SM |
2913 | { |
2914 | if (SYMBOLP (object) && !NILP (Ffboundp (object))) | |
2915 | { | |
ba83908c | 2916 | object = Findirect_function (object, Qt); |
b9598260 SM |
2917 | |
2918 | if (CONSP (object) && EQ (XCAR (object), Qautoload)) | |
2919 | { | |
2920 | /* Autoloaded symbols are functions, except if they load | |
2921 | macros or keymaps. */ | |
2922 | int i; | |
2923 | for (i = 0; i < 4 && CONSP (object); i++) | |
2924 | object = XCDR (object); | |
2925 | ||
2926 | return (CONSP (object) && !NILP (XCAR (object))) ? Qnil : Qt; | |
2927 | } | |
2928 | } | |
2929 | ||
2930 | if (SUBRP (object)) | |
3c3ddb98 | 2931 | return (XSUBR (object)->max_args != UNEVALLED) ? Qt : Qnil; |
876c194c | 2932 | else if (COMPILEDP (object)) |
b9598260 SM |
2933 | return Qt; |
2934 | else if (CONSP (object)) | |
2935 | { | |
2936 | Lisp_Object car = XCAR (object); | |
2937 | return (EQ (car, Qlambda) || EQ (car, Qclosure)) ? Qt : Qnil; | |
2938 | } | |
2939 | else | |
2940 | return Qnil; | |
2941 | } | |
2942 | ||
16a97296 | 2943 | DEFUE ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2944 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2945 | Return the value that function returns. | |
2946 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2947 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
c5101a77 | 2948 | (size_t nargs, Lisp_Object *args) |
db9f0278 | 2949 | { |
8788120f | 2950 | Lisp_Object fun, original_fun; |
db9f0278 | 2951 | Lisp_Object funcar; |
c5101a77 | 2952 | size_t numargs = nargs - 1; |
db9f0278 JB |
2953 | Lisp_Object lisp_numargs; |
2954 | Lisp_Object val; | |
2955 | struct backtrace backtrace; | |
2956 | register Lisp_Object *internal_args; | |
c5101a77 | 2957 | register size_t i; |
db9f0278 JB |
2958 | |
2959 | QUIT; | |
ee830945 RS |
2960 | if ((consing_since_gc > gc_cons_threshold |
2961 | && consing_since_gc > gc_relative_threshold) | |
2962 | || | |
2963 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 2964 | Fgarbage_collect (); |
db9f0278 JB |
2965 | |
2966 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2967 | { | |
2968 | if (max_lisp_eval_depth < 100) | |
2969 | max_lisp_eval_depth = 100; | |
2970 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2971 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2972 | } |
2973 | ||
2974 | backtrace.next = backtrace_list; | |
2975 | backtrace_list = &backtrace; | |
2976 | backtrace.function = &args[0]; | |
2977 | backtrace.args = &args[1]; | |
2978 | backtrace.nargs = nargs - 1; | |
2979 | backtrace.evalargs = 0; | |
2980 | backtrace.debug_on_exit = 0; | |
2981 | ||
2982 | if (debug_on_next_call) | |
2983 | do_debug_on_call (Qlambda); | |
2984 | ||
fff3ff9c KS |
2985 | CHECK_CONS_LIST (); |
2986 | ||
8788120f KS |
2987 | original_fun = args[0]; |
2988 | ||
db9f0278 JB |
2989 | retry: |
2990 | ||
8788120f KS |
2991 | /* Optimize for no indirection. */ |
2992 | fun = original_fun; | |
2993 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2994 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2995 | fun = indirect_function (fun); | |
db9f0278 | 2996 | |
90165123 | 2997 | if (SUBRP (fun)) |
db9f0278 | 2998 | { |
ef1b0ba7 | 2999 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
3000 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
3001 | { | |
a631e24c | 3002 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 3003 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
3004 | } |
3005 | ||
ef1b0ba7 | 3006 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 3007 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 3008 | |
ef1b0ba7 SM |
3009 | else if (XSUBR (fun)->max_args == MANY) |
3010 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 3011 | else |
db9f0278 | 3012 | { |
ef1b0ba7 SM |
3013 | if (XSUBR (fun)->max_args > numargs) |
3014 | { | |
3015 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
3016 | memcpy (internal_args, args + 1, numargs * sizeof (Lisp_Object)); | |
3017 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
3018 | internal_args[i] = Qnil; | |
3019 | } | |
3020 | else | |
3021 | internal_args = args + 1; | |
3022 | switch (XSUBR (fun)->max_args) | |
3023 | { | |
3024 | case 0: | |
3025 | val = (XSUBR (fun)->function.a0 ()); | |
3026 | break; | |
3027 | case 1: | |
3028 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
3029 | break; | |
3030 | case 2: | |
3031 | val = (XSUBR (fun)->function.a2 | |
3032 | (internal_args[0], internal_args[1])); | |
3033 | break; | |
3034 | case 3: | |
3035 | val = (XSUBR (fun)->function.a3 | |
3036 | (internal_args[0], internal_args[1], internal_args[2])); | |
3037 | break; | |
3038 | case 4: | |
3039 | val = (XSUBR (fun)->function.a4 | |
3040 | (internal_args[0], internal_args[1], internal_args[2], | |
3041 | internal_args[3])); | |
3042 | break; | |
3043 | case 5: | |
3044 | val = (XSUBR (fun)->function.a5 | |
3045 | (internal_args[0], internal_args[1], internal_args[2], | |
3046 | internal_args[3], internal_args[4])); | |
3047 | break; | |
3048 | case 6: | |
3049 | val = (XSUBR (fun)->function.a6 | |
3050 | (internal_args[0], internal_args[1], internal_args[2], | |
3051 | internal_args[3], internal_args[4], internal_args[5])); | |
3052 | break; | |
3053 | case 7: | |
3054 | val = (XSUBR (fun)->function.a7 | |
3055 | (internal_args[0], internal_args[1], internal_args[2], | |
3056 | internal_args[3], internal_args[4], internal_args[5], | |
3057 | internal_args[6])); | |
3058 | break; | |
3059 | ||
3060 | case 8: | |
3061 | val = (XSUBR (fun)->function.a8 | |
3062 | (internal_args[0], internal_args[1], internal_args[2], | |
3063 | internal_args[3], internal_args[4], internal_args[5], | |
3064 | internal_args[6], internal_args[7])); | |
3065 | break; | |
3066 | ||
3067 | default: | |
3068 | ||
3069 | /* If a subr takes more than 8 arguments without using MANY | |
3070 | or UNEVALLED, we need to extend this function to support it. | |
3071 | Until this is done, there is no way to call the function. */ | |
3072 | abort (); | |
3073 | } | |
db9f0278 JB |
3074 | } |
3075 | } | |
ef1b0ba7 | 3076 | else if (COMPILEDP (fun)) |
db9f0278 JB |
3077 | val = funcall_lambda (fun, numargs, args + 1); |
3078 | else | |
3079 | { | |
8788120f | 3080 | if (EQ (fun, Qunbound)) |
734d55a2 | 3081 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 3082 | if (!CONSP (fun)) |
734d55a2 KS |
3083 | xsignal1 (Qinvalid_function, original_fun); |
3084 | funcar = XCAR (fun); | |
90165123 | 3085 | if (!SYMBOLP (funcar)) |
734d55a2 | 3086 | xsignal1 (Qinvalid_function, original_fun); |
defb1411 SM |
3087 | if (EQ (funcar, Qlambda) |
3088 | || EQ (funcar, Qclosure)) | |
db9f0278 | 3089 | val = funcall_lambda (fun, numargs, args + 1); |
db9f0278 JB |
3090 | else if (EQ (funcar, Qautoload)) |
3091 | { | |
8788120f | 3092 | do_autoload (fun, original_fun); |
fff3ff9c | 3093 | CHECK_CONS_LIST (); |
db9f0278 JB |
3094 | goto retry; |
3095 | } | |
3096 | else | |
734d55a2 | 3097 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 3098 | } |
c1788fbc | 3099 | CHECK_CONS_LIST (); |
db9f0278 JB |
3100 | lisp_eval_depth--; |
3101 | if (backtrace.debug_on_exit) | |
3102 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
3103 | backtrace_list = backtrace.next; | |
3104 | return val; | |
3105 | } | |
3106 | \f | |
2f7c71a1 | 3107 | static Lisp_Object |
defb1411 | 3108 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
3109 | { |
3110 | Lisp_Object args_left; | |
c5101a77 | 3111 | size_t numargs; |
db9f0278 JB |
3112 | register Lisp_Object *arg_vector; |
3113 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c5101a77 | 3114 | register size_t i; |
db9f0278 | 3115 | register Lisp_Object tem; |
3a7a9129 | 3116 | USE_SAFE_ALLOCA; |
db9f0278 | 3117 | |
c5101a77 PE |
3118 | numargs = XINT (Flength (args)); |
3119 | SAFE_ALLOCA_LISP (arg_vector, numargs); | |
db9f0278 JB |
3120 | args_left = args; |
3121 | ||
3122 | GCPRO3 (*arg_vector, args_left, fun); | |
3123 | gcpro1.nvars = 0; | |
3124 | ||
c5101a77 | 3125 | for (i = 0; i < numargs; ) |
db9f0278 JB |
3126 | { |
3127 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
defb1411 | 3128 | tem = eval_sub (tem); |
db9f0278 JB |
3129 | arg_vector[i++] = tem; |
3130 | gcpro1.nvars = i; | |
3131 | } | |
3132 | ||
3133 | UNGCPRO; | |
3134 | ||
f07a954e SM |
3135 | backtrace_list->args = arg_vector; |
3136 | backtrace_list->nargs = i; | |
db9f0278 | 3137 | backtrace_list->evalargs = 0; |
c5101a77 | 3138 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
3139 | |
3140 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3141 | if (backtrace_list->debug_on_exit) | |
3142 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3143 | /* Don't do it again when we return to eval. */ | |
3144 | backtrace_list->debug_on_exit = 0; | |
3a7a9129 | 3145 | SAFE_FREE (); |
db9f0278 JB |
3146 | return tem; |
3147 | } | |
3148 | ||
3149 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
3150 | and return the result of evaluation. | |
3151 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3152 | ||
2901f1d1 | 3153 | static Lisp_Object |
c5101a77 PE |
3154 | funcall_lambda (Lisp_Object fun, size_t nargs, |
3155 | register Lisp_Object *arg_vector) | |
db9f0278 | 3156 | { |
defb1411 | 3157 | Lisp_Object val, syms_left, next, lexenv; |
aed13378 | 3158 | int count = SPECPDL_INDEX (); |
c5101a77 PE |
3159 | size_t i; |
3160 | int optional, rest; | |
db9f0278 | 3161 | |
90165123 | 3162 | if (CONSP (fun)) |
9ab90667 | 3163 | { |
defb1411 SM |
3164 | if (EQ (XCAR (fun), Qclosure)) |
3165 | { | |
3166 | fun = XCDR (fun); /* Drop `closure'. */ | |
3167 | lexenv = XCAR (fun); | |
23aba0ea | 3168 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
3169 | } |
3170 | else | |
3171 | lexenv = Qnil; | |
9ab90667 GM |
3172 | syms_left = XCDR (fun); |
3173 | if (CONSP (syms_left)) | |
3174 | syms_left = XCAR (syms_left); | |
3175 | else | |
734d55a2 | 3176 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3177 | } |
90165123 | 3178 | else if (COMPILEDP (fun)) |
defb1411 | 3179 | { |
798cb644 SM |
3180 | syms_left = AREF (fun, COMPILED_ARGLIST); |
3181 | if (INTEGERP (syms_left)) | |
876c194c SM |
3182 | /* A byte-code object with a non-nil `push args' slot means we |
3183 | shouldn't bind any arguments, instead just call the byte-code | |
3184 | interpreter directly; it will push arguments as necessary. | |
3185 | ||
3186 | Byte-code objects with either a non-existant, or a nil value for | |
3187 | the `push args' slot (the default), have dynamically-bound | |
3188 | arguments, and use the argument-binding code below instead (as do | |
3189 | all interpreted functions, even lexically bound ones). */ | |
3190 | { | |
3191 | /* If we have not actually read the bytecode string | |
3192 | and constants vector yet, fetch them from the file. */ | |
3193 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
3194 | Ffetch_bytecode (fun); | |
3195 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
3196 | AREF (fun, COMPILED_CONSTANTS), | |
3197 | AREF (fun, COMPILED_STACK_DEPTH), | |
798cb644 | 3198 | syms_left, |
876c194c SM |
3199 | nargs, arg_vector); |
3200 | } | |
defb1411 SM |
3201 | lexenv = Qnil; |
3202 | } | |
9ab90667 GM |
3203 | else |
3204 | abort (); | |
db9f0278 | 3205 | |
9ab90667 GM |
3206 | i = optional = rest = 0; |
3207 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3208 | { |
3209 | QUIT; | |
177c0ea7 | 3210 | |
9ab90667 | 3211 | next = XCAR (syms_left); |
8788120f | 3212 | if (!SYMBOLP (next)) |
734d55a2 | 3213 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3214 | |
db9f0278 JB |
3215 | if (EQ (next, Qand_rest)) |
3216 | rest = 1; | |
3217 | else if (EQ (next, Qand_optional)) | |
3218 | optional = 1; | |
db9f0278 | 3219 | else |
db9f0278 | 3220 | { |
e610eaca | 3221 | Lisp_Object arg; |
defb1411 SM |
3222 | if (rest) |
3223 | { | |
e610eaca | 3224 | arg = Flist (nargs - i, &arg_vector[i]); |
defb1411 SM |
3225 | i = nargs; |
3226 | } | |
3227 | else if (i < nargs) | |
e610eaca | 3228 | arg = arg_vector[i++]; |
b9598260 SM |
3229 | else if (!optional) |
3230 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3231 | else | |
e610eaca | 3232 | arg = Qnil; |
7200d79c | 3233 | |
b9598260 | 3234 | /* Bind the argument. */ |
876c194c | 3235 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 | 3236 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
e610eaca | 3237 | lexenv = Fcons (Fcons (next, arg), lexenv); |
b9598260 SM |
3238 | else |
3239 | /* Dynamically bind NEXT. */ | |
e610eaca | 3240 | specbind (next, arg); |
db9f0278 | 3241 | } |
db9f0278 JB |
3242 | } |
3243 | ||
9ab90667 | 3244 | if (!NILP (syms_left)) |
734d55a2 | 3245 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3246 | else if (i < nargs) |
734d55a2 | 3247 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3248 | |
b9598260 SM |
3249 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3250 | /* Instantiate a new lexical environment. */ | |
3251 | specbind (Qinternal_interpreter_environment, lexenv); | |
3252 | ||
90165123 | 3253 | if (CONSP (fun)) |
9ab90667 | 3254 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3255 | else |
ca248607 RS |
3256 | { |
3257 | /* If we have not actually read the bytecode string | |
3258 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3259 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3260 | Ffetch_bytecode (fun); |
b9598260 SM |
3261 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3262 | AREF (fun, COMPILED_CONSTANTS), | |
3263 | AREF (fun, COMPILED_STACK_DEPTH), | |
3264 | Qnil, 0, 0); | |
ca248607 | 3265 | } |
177c0ea7 | 3266 | |
db9f0278 JB |
3267 | return unbind_to (count, val); |
3268 | } | |
661c7d6e KH |
3269 | |
3270 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3271 | 1, 1, 0, |
3272 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3273 | (Lisp_Object object) |
661c7d6e KH |
3274 | { |
3275 | Lisp_Object tem; | |
3276 | ||
845975f5 | 3277 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3278 | { |
845975f5 | 3279 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3280 | if (!CONSP (tem)) |
845975f5 SM |
3281 | { |
3282 | tem = AREF (object, COMPILED_BYTECODE); | |
3283 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3284 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3285 | else |
3286 | error ("Invalid byte code"); | |
3287 | } | |
3ae565b3 SM |
3288 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3289 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3290 | } |
3291 | return object; | |
3292 | } | |
db9f0278 | 3293 | \f |
475545b5 | 3294 | static void |
d3da34e0 | 3295 | grow_specpdl (void) |
db9f0278 | 3296 | { |
aed13378 | 3297 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3298 | if (specpdl_size >= max_specpdl_size) |
3299 | { | |
3300 | if (max_specpdl_size < 400) | |
3301 | max_specpdl_size = 400; | |
3302 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3303 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3304 | } |
3305 | specpdl_size *= 2; | |
3306 | if (specpdl_size > max_specpdl_size) | |
3307 | specpdl_size = max_specpdl_size; | |
3308 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3309 | specpdl_ptr = specpdl + count; | |
3310 | } | |
3311 | ||
f6d62986 | 3312 | /* `specpdl_ptr->symbol' is a field which describes which variable is |
4e2db1fe SM |
3313 | let-bound, so it can be properly undone when we unbind_to. |
3314 | It can have the following two shapes: | |
3315 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3316 | a symbol that is not buffer-local (at least at the time | |
3317 | the let binding started). Note also that it should not be | |
3318 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3319 | to record V2 here). | |
3320 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3321 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3322 | which buffer is affected (or nil if the let-binding affects the | |
3323 | global value of the variable) and BUFFER tells us which buffer was | |
3324 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3325 | BUFFER did not yet have a buffer-local value). */ | |
3326 | ||
db9f0278 | 3327 | void |
d3da34e0 | 3328 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3329 | { |
ce5b453a SM |
3330 | struct Lisp_Symbol *sym; |
3331 | ||
3332 | eassert (!handling_signal); | |
db9f0278 | 3333 | |
b7826503 | 3334 | CHECK_SYMBOL (symbol); |
ce5b453a | 3335 | sym = XSYMBOL (symbol); |
db9f0278 JB |
3336 | if (specpdl_ptr == specpdl + specpdl_size) |
3337 | grow_specpdl (); | |
719177b3 | 3338 | |
ce5b453a SM |
3339 | start: |
3340 | switch (sym->redirect) | |
719177b3 | 3341 | { |
ce5b453a SM |
3342 | case SYMBOL_VARALIAS: |
3343 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3344 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3345 | /* The most common case is that of a non-constant symbol with a |
3346 | trivial value. Make that as fast as we can. */ | |
3347 | specpdl_ptr->symbol = symbol; | |
3348 | specpdl_ptr->old_value = SYMBOL_VAL (sym); | |
3349 | specpdl_ptr->func = NULL; | |
3350 | ++specpdl_ptr; | |
3351 | if (!sym->constant) | |
3352 | SET_SYMBOL_VAL (sym, value); | |
3353 | else | |
3354 | set_internal (symbol, value, Qnil, 1); | |
3355 | break; | |
4e2db1fe SM |
3356 | case SYMBOL_LOCALIZED: |
3357 | if (SYMBOL_BLV (sym)->frame_local) | |
3358 | error ("Frame-local vars cannot be let-bound"); | |
3359 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3360 | { |
3361 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3362 | specpdl_ptr->func = 0; | |
3363 | specpdl_ptr->old_value = ovalue; | |
3364 | ||
3365 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3366 | || (EQ (SYMBOL_BLV (sym)->where, | |
3367 | SYMBOL_BLV (sym)->frame_local ? | |
3368 | Fselected_frame () : Fcurrent_buffer ()))); | |
3369 | ||
3370 | if (sym->redirect == SYMBOL_LOCALIZED | |
3371 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3372 | { | |
3373 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3374 | ||
3375 | /* For a local variable, record both the symbol and which | |
3376 | buffer's or frame's value we are saving. */ | |
3377 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3378 | { | |
3379 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3380 | || (BLV_FOUND (SYMBOL_BLV (sym)) | |
3381 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); | |
3382 | where = cur_buf; | |
3383 | } | |
3384 | else if (sym->redirect == SYMBOL_LOCALIZED | |
3385 | && BLV_FOUND (SYMBOL_BLV (sym))) | |
3386 | where = SYMBOL_BLV (sym)->where; | |
3387 | else | |
3388 | where = Qnil; | |
3389 | ||
3390 | /* We're not using the `unused' slot in the specbinding | |
3391 | structure because this would mean we have to do more | |
3392 | work for simple variables. */ | |
3393 | /* FIXME: The third value `current_buffer' is only used in | |
3394 | let_shadows_buffer_binding_p which is itself only used | |
3395 | in set_internal for local_if_set. */ | |
4e2db1fe | 3396 | eassert (NILP (where) || EQ (where, cur_buf)); |
ce5b453a SM |
3397 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, cur_buf)); |
3398 | ||
3399 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3400 | buffer-local value here, make the `let' change the global | |
3401 | value by changing the value of SYMBOL in all buffers not | |
3402 | having their own value. This is consistent with what | |
3403 | happens with other buffer-local variables. */ | |
3404 | if (NILP (where) | |
3405 | && sym->redirect == SYMBOL_FORWARDED) | |
3406 | { | |
3407 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3408 | ++specpdl_ptr; | |
3409 | Fset_default (symbol, value); | |
3410 | return; | |
3411 | } | |
3412 | } | |
3413 | else | |
3414 | specpdl_ptr->symbol = symbol; | |
3415 | ||
3416 | specpdl_ptr++; | |
94b612ad | 3417 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3418 | break; |
3419 | } | |
3420 | default: abort (); | |
9ab90667 | 3421 | } |
db9f0278 JB |
3422 | } |
3423 | ||
3424 | void | |
d3da34e0 | 3425 | record_unwind_protect (Lisp_Object (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3426 | { |
9ba8e10d CY |
3427 | eassert (!handling_signal); |
3428 | ||
db9f0278 JB |
3429 | if (specpdl_ptr == specpdl + specpdl_size) |
3430 | grow_specpdl (); | |
3431 | specpdl_ptr->func = function; | |
3432 | specpdl_ptr->symbol = Qnil; | |
3433 | specpdl_ptr->old_value = arg; | |
3434 | specpdl_ptr++; | |
3435 | } | |
3436 | ||
3437 | Lisp_Object | |
d3da34e0 | 3438 | unbind_to (int count, Lisp_Object value) |
db9f0278 | 3439 | { |
5a073f50 KS |
3440 | Lisp_Object quitf = Vquit_flag; |
3441 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3442 | |
5a073f50 | 3443 | GCPRO2 (value, quitf); |
db9f0278 JB |
3444 | Vquit_flag = Qnil; |
3445 | ||
3446 | while (specpdl_ptr != specpdl + count) | |
3447 | { | |
611a8f8c RS |
3448 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3449 | the work to unbind it. We decrement first | |
3450 | so that an error in unbinding won't try to unbind | |
3451 | the same entry again, and we copy the binding first | |
3452 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3453 | |
45f266dc DL |
3454 | struct specbinding this_binding; |
3455 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3456 | |
3457 | if (this_binding.func != 0) | |
3458 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3459 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3460 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3461 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3462 | bound a variable that had a buffer-local or frame-local |
3463 | binding. WHERE nil means that the variable had the default | |
0967b4b0 | 3464 | value when it was bound. CURRENT-BUFFER is the buffer that |
bb8e180f | 3465 | was current when the variable was bound. */ |
611a8f8c | 3466 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3467 | { |
eb700b82 | 3468 | Lisp_Object symbol, where; |
719177b3 | 3469 | |
611a8f8c RS |
3470 | symbol = XCAR (this_binding.symbol); |
3471 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3472 | |
eb700b82 | 3473 | if (NILP (where)) |
611a8f8c | 3474 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3475 | /* If `where' is non-nil, reset the value in the appropriate |
3476 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3477 | else if (BUFFERP (where) |
3478 | ? !NILP (Flocal_variable_p (symbol, where)) | |
3479 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) | |
3480 | set_internal (symbol, this_binding.old_value, where, 1); | |
719177b3 | 3481 | } |
94b612ad SM |
3482 | /* If variable has a trivial value (no forwarding), we can |
3483 | just set it. No need to check for constant symbols here, | |
3484 | since that was already done by specbind. */ | |
3485 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3486 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3487 | this_binding.old_value); | |
db9f0278 | 3488 | else |
94b612ad SM |
3489 | /* NOTE: we only ever come here if make_local_foo was used for |
3490 | the first time on this var within this let. */ | |
3491 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3492 | } |
177c0ea7 | 3493 | |
5a073f50 KS |
3494 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3495 | Vquit_flag = quitf; | |
db9f0278 JB |
3496 | |
3497 | UNGCPRO; | |
db9f0278 JB |
3498 | return value; |
3499 | } | |
b9598260 | 3500 | |
4a330052 | 3501 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3502 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3503 | A special variable is one that will be bound dynamically, even in a | |
3504 | context where binding is lexical by default. */) | |
c566235d | 3505 | (Lisp_Object symbol) |
b9598260 SM |
3506 | { |
3507 | CHECK_SYMBOL (symbol); | |
3508 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3509 | } | |
3510 | ||
db9f0278 | 3511 | \f |
db9f0278 | 3512 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3513 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3514 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3515 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 JB |
3516 | { |
3517 | register struct backtrace *backlist = backtrace_list; | |
3518 | register int i; | |
3519 | ||
b7826503 | 3520 | CHECK_NUMBER (level); |
db9f0278 JB |
3521 | |
3522 | for (i = 0; backlist && i < XINT (level); i++) | |
3523 | { | |
3524 | backlist = backlist->next; | |
3525 | } | |
3526 | ||
3527 | if (backlist) | |
265a9e55 | 3528 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3529 | |
3530 | return flag; | |
3531 | } | |
3532 | ||
3533 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3534 | doc: /* Print a trace of Lisp function calls currently active. |
3535 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3536 | (void) |
db9f0278 JB |
3537 | { |
3538 | register struct backtrace *backlist = backtrace_list; | |
db9f0278 JB |
3539 | Lisp_Object tail; |
3540 | Lisp_Object tem; | |
db9f0278 | 3541 | struct gcpro gcpro1; |
d4b6d95d | 3542 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3543 | |
d4b6d95d LMI |
3544 | if (NILP (Vprint_level)) |
3545 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 JB |
3546 | |
3547 | tail = Qnil; | |
3548 | GCPRO1 (tail); | |
3549 | ||
3550 | while (backlist) | |
3551 | { | |
3552 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
44f230aa | 3553 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3554 | { |
3555 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3556 | write_string ("\n", -1); |
db9f0278 JB |
3557 | } |
3558 | else | |
3559 | { | |
3560 | tem = *backlist->function; | |
f6d62986 | 3561 | Fprin1 (tem, Qnil); /* This can QUIT. */ |
db9f0278 | 3562 | write_string ("(", -1); |
44f230aa SM |
3563 | if (backlist->nargs == MANY) |
3564 | { /* FIXME: Can this happen? */ | |
a3eed478 | 3565 | int i; |
db9f0278 | 3566 | for (tail = *backlist->args, i = 0; |
265a9e55 | 3567 | !NILP (tail); |
a3eed478 | 3568 | tail = Fcdr (tail), i = 1) |
db9f0278 JB |
3569 | { |
3570 | if (i) write_string (" ", -1); | |
3571 | Fprin1 (Fcar (tail), Qnil); | |
3572 | } | |
3573 | } | |
3574 | else | |
3575 | { | |
a3eed478 | 3576 | size_t i; |
db9f0278 JB |
3577 | for (i = 0; i < backlist->nargs; i++) |
3578 | { | |
3579 | if (i) write_string (" ", -1); | |
3580 | Fprin1 (backlist->args[i], Qnil); | |
3581 | } | |
3582 | } | |
b6703b02 | 3583 | write_string (")\n", -1); |
db9f0278 | 3584 | } |
db9f0278 JB |
3585 | backlist = backlist->next; |
3586 | } | |
3587 | ||
d4b6d95d | 3588 | Vprint_level = old_print_level; |
db9f0278 JB |
3589 | UNGCPRO; |
3590 | return Qnil; | |
3591 | } | |
3592 | ||
17401c97 | 3593 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3594 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3595 | If that frame has not evaluated the arguments yet (or is a special form), | |
3596 | the value is (nil FUNCTION ARG-FORMS...). | |
3597 | If that frame has evaluated its arguments and called its function already, | |
3598 | the value is (t FUNCTION ARG-VALUES...). | |
3599 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3600 | FUNCTION is whatever was supplied as car of evaluated list, | |
3601 | or a lambda expression for macro calls. | |
3602 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3603 | (Lisp_Object nframes) |
db9f0278 JB |
3604 | { |
3605 | register struct backtrace *backlist = backtrace_list; | |
5d5d959d | 3606 | register EMACS_INT i; |
db9f0278 JB |
3607 | Lisp_Object tem; |
3608 | ||
b7826503 | 3609 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3610 | |
3611 | /* Find the frame requested. */ | |
b6703b02 | 3612 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3613 | backlist = backlist->next; |
3614 | ||
3615 | if (!backlist) | |
3616 | return Qnil; | |
44f230aa | 3617 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3618 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); |
3619 | else | |
3620 | { | |
44f230aa | 3621 | if (backlist->nargs == MANY) /* FIXME: Can this happen? */ |
db9f0278 JB |
3622 | tem = *backlist->args; |
3623 | else | |
3624 | tem = Flist (backlist->nargs, backlist->args); | |
3625 | ||
3626 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3627 | } | |
3628 | } | |
a2ff3819 | 3629 | |
db9f0278 | 3630 | \f |
4ce0541e | 3631 | void |
d3da34e0 | 3632 | mark_backtrace (void) |
4ce0541e SM |
3633 | { |
3634 | register struct backtrace *backlist; | |
c5101a77 | 3635 | register size_t i; |
4ce0541e SM |
3636 | |
3637 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3638 | { | |
3639 | mark_object (*backlist->function); | |
3640 | ||
44f230aa SM |
3641 | if (backlist->nargs == UNEVALLED |
3642 | || backlist->nargs == MANY) /* FIXME: Can this happen? */ | |
c5101a77 | 3643 | i = 1; |
4ce0541e | 3644 | else |
c5101a77 PE |
3645 | i = backlist->nargs; |
3646 | while (i--) | |
4ce0541e SM |
3647 | mark_object (backlist->args[i]); |
3648 | } | |
3649 | } | |
3650 | ||
dfcf069d | 3651 | void |
d3da34e0 | 3652 | syms_of_eval (void) |
db9f0278 | 3653 | { |
29208e82 | 3654 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
82fc29a1 | 3655 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3656 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3657 | an error is signaled. |
3658 | You can safely use a value considerably larger than the default value, | |
3659 | if that proves inconveniently small. However, if you increase it too far, | |
3660 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3661 | |
29208e82 | 3662 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
9dbc9081 | 3663 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3664 | |
3665 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3666 | actual stack overflow in C, which would be fatal for Emacs. |
3667 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3668 | if that proves inconveniently small. However, if you increase it too far, |
3669 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3670 | |
29208e82 | 3671 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3672 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3673 | If the value is t, that means do an ordinary quit. |
3674 | If the value equals `throw-on-input', that means quit by throwing | |
3675 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3676 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3677 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3678 | Vquit_flag = Qnil; |
3679 | ||
29208e82 | 3680 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3681 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3682 | Note that `quit-flag' will still be set by typing C-g, | |
3683 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3684 | To prevent this happening, set `quit-flag' to nil | |
3685 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3686 | Vinhibit_quit = Qnil; |
3687 | ||
d67b4f80 | 3688 | Qinhibit_quit = intern_c_string ("inhibit-quit"); |
ad236261 JB |
3689 | staticpro (&Qinhibit_quit); |
3690 | ||
d67b4f80 | 3691 | Qautoload = intern_c_string ("autoload"); |
db9f0278 JB |
3692 | staticpro (&Qautoload); |
3693 | ||
d67b4f80 | 3694 | Qdebug_on_error = intern_c_string ("debug-on-error"); |
db9f0278 JB |
3695 | staticpro (&Qdebug_on_error); |
3696 | ||
d67b4f80 | 3697 | Qmacro = intern_c_string ("macro"); |
db9f0278 JB |
3698 | staticpro (&Qmacro); |
3699 | ||
d67b4f80 | 3700 | Qdeclare = intern_c_string ("declare"); |
d6edd563 | 3701 | staticpro (&Qdeclare); |
177c0ea7 | 3702 | |
db9f0278 JB |
3703 | /* Note that the process handling also uses Qexit, but we don't want |
3704 | to staticpro it twice, so we just do it here. */ | |
d67b4f80 | 3705 | Qexit = intern_c_string ("exit"); |
db9f0278 JB |
3706 | staticpro (&Qexit); |
3707 | ||
d67b4f80 | 3708 | Qinteractive = intern_c_string ("interactive"); |
db9f0278 JB |
3709 | staticpro (&Qinteractive); |
3710 | ||
d67b4f80 | 3711 | Qcommandp = intern_c_string ("commandp"); |
db9f0278 JB |
3712 | staticpro (&Qcommandp); |
3713 | ||
d67b4f80 | 3714 | Qdefun = intern_c_string ("defun"); |
db9f0278 JB |
3715 | staticpro (&Qdefun); |
3716 | ||
d67b4f80 | 3717 | Qand_rest = intern_c_string ("&rest"); |
db9f0278 JB |
3718 | staticpro (&Qand_rest); |
3719 | ||
d67b4f80 | 3720 | Qand_optional = intern_c_string ("&optional"); |
db9f0278 JB |
3721 | staticpro (&Qand_optional); |
3722 | ||
b9598260 SM |
3723 | Qclosure = intern_c_string ("closure"); |
3724 | staticpro (&Qclosure); | |
3725 | ||
d67b4f80 | 3726 | Qdebug = intern_c_string ("debug"); |
f01cbfdd RS |
3727 | staticpro (&Qdebug); |
3728 | ||
29208e82 | 3729 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
9dbc9081 PJ |
3730 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3731 | Does not apply to errors handled by `condition-case' or those | |
3732 | matched by `debug-ignored-errors'. | |
3733 | If the value is a list, an error only means to enter the debugger | |
3734 | if one of its condition symbols appears in the list. | |
3735 | When you evaluate an expression interactively, this variable | |
3736 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f CY |
3737 | The command `toggle-debug-on-error' toggles this. |
3738 | See also the variable `debug-on-quit'. */); | |
128c0f66 | 3739 | Vdebug_on_error = Qnil; |
db9f0278 | 3740 | |
29208e82 | 3741 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
9dbc9081 PJ |
3742 | doc: /* *List of errors for which the debugger should not be called. |
3743 | Each element may be a condition-name or a regexp that matches error messages. | |
3744 | If any element applies to a given error, that error skips the debugger | |
3745 | and just returns to top level. | |
3746 | This overrides the variable `debug-on-error'. | |
3747 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3748 | Vdebug_ignored_errors = Qnil; |
3749 | ||
29208e82 | 3750 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
82fc29a1 JB |
3751 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3752 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3753 | debug_on_quit = 0; |
3754 | ||
29208e82 | 3755 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3756 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3757 | |
29208e82 | 3758 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3759 | doc: /* Non-nil means debugger may continue execution. |
3760 | This is nil when the debugger is called under circumstances where it | |
3761 | might not be safe to continue. */); | |
dac204bc | 3762 | debugger_may_continue = 1; |
556d7314 | 3763 | |
29208e82 | 3764 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3765 | doc: /* Function to call to invoke debugger. |
3766 | If due to frame exit, args are `exit' and the value being returned; | |
3767 | this function's value will be returned instead of that. | |
3768 | If due to error, args are `error' and a list of the args to `signal'. | |
3769 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3770 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3771 | Vdebugger = Qnil; |
3772 | ||
29208e82 | 3773 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3774 | doc: /* If non-nil, this is a function for `signal' to call. |
3775 | It receives the same arguments that `signal' was given. | |
3776 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3777 | Vsignal_hook_function = Qnil; |
3778 | ||
29208e82 | 3779 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
9dbc9081 PJ |
3780 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3781 | Note that `debug-on-error', `debug-on-quit' and friends | |
3782 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3783 | Vdebug_on_signal = Qnil; |
61ede770 | 3784 | |
29208e82 | 3785 | DEFVAR_LISP ("macro-declaration-function", Vmacro_declaration_function, |
d6edd563 GM |
3786 | doc: /* Function to process declarations in a macro definition. |
3787 | The function will be called with two args MACRO and DECL. | |
3788 | MACRO is the name of the macro being defined. | |
3789 | DECL is a list `(declare ...)' containing the declarations. | |
3790 | The value the function returns is not used. */); | |
3791 | Vmacro_declaration_function = Qnil; | |
3792 | ||
b38b1ec0 SM |
3793 | /* When lexical binding is being used, |
3794 | vinternal_interpreter_environment is non-nil, and contains an alist | |
3795 | of lexically-bound variable, or (t), indicating an empty | |
3796 | environment. The lisp name of this variable would be | |
3797 | `internal-interpreter-environment' if it weren't hidden. | |
3798 | Every element of this list can be either a cons (VAR . VAL) | |
3799 | specifying a lexical binding, or a single symbol VAR indicating | |
3800 | that this variable should use dynamic scoping. */ | |
b9598260 SM |
3801 | Qinternal_interpreter_environment |
3802 | = intern_c_string ("internal-interpreter-environment"); | |
3803 | staticpro (&Qinternal_interpreter_environment); | |
b38b1ec0 SM |
3804 | DEFVAR_LISP ("internal-interpreter-environment", |
3805 | Vinternal_interpreter_environment, | |
b9598260 SM |
3806 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
3807 | When lexical binding is not being used, this variable is nil. | |
3808 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3809 | alist of active lexical bindings. */); | |
3810 | Vinternal_interpreter_environment = Qnil; | |
b38b1ec0 SM |
3811 | /* Don't export this variable to Elisp, so noone can mess with it |
3812 | (Just imagine if someone makes it buffer-local). */ | |
3813 | Funintern (Qinternal_interpreter_environment, Qnil); | |
b9598260 | 3814 | |
d67b4f80 | 3815 | Vrun_hooks = intern_c_string ("run-hooks"); |
6e6e9f08 | 3816 | staticpro (&Vrun_hooks); |
db9f0278 JB |
3817 | |
3818 | staticpro (&Vautoload_queue); | |
3819 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3820 | staticpro (&Vsignaling_function); |
3821 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3822 | |
3823 | defsubr (&Sor); | |
3824 | defsubr (&Sand); | |
3825 | defsubr (&Sif); | |
3826 | defsubr (&Scond); | |
3827 | defsubr (&Sprogn); | |
3828 | defsubr (&Sprog1); | |
3829 | defsubr (&Sprog2); | |
3830 | defsubr (&Ssetq); | |
3831 | defsubr (&Squote); | |
3832 | defsubr (&Sfunction); | |
3833 | defsubr (&Sdefun); | |
3834 | defsubr (&Sdefmacro); | |
3835 | defsubr (&Sdefvar); | |
19cebf5a | 3836 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3837 | defsubr (&Sdefconst); |
3838 | defsubr (&Suser_variable_p); | |
3839 | defsubr (&Slet); | |
3840 | defsubr (&SletX); | |
3841 | defsubr (&Swhile); | |
3842 | defsubr (&Smacroexpand); | |
3843 | defsubr (&Scatch); | |
3844 | defsubr (&Sthrow); | |
3845 | defsubr (&Sunwind_protect); | |
3846 | defsubr (&Scondition_case); | |
3847 | defsubr (&Ssignal); | |
3848 | defsubr (&Sinteractive_p); | |
4b664e76 | 3849 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
3850 | defsubr (&Scommandp); |
3851 | defsubr (&Sautoload); | |
3852 | defsubr (&Seval); | |
3853 | defsubr (&Sapply); | |
3854 | defsubr (&Sfuncall); | |
ff936e53 SM |
3855 | defsubr (&Srun_hooks); |
3856 | defsubr (&Srun_hook_with_args); | |
3857 | defsubr (&Srun_hook_with_args_until_success); | |
3858 | defsubr (&Srun_hook_with_args_until_failure); | |
f6d62986 | 3859 | defsubr (&Srun_hook_wrapped); |
661c7d6e | 3860 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3861 | defsubr (&Sbacktrace_debug); |
3862 | defsubr (&Sbacktrace); | |
3863 | defsubr (&Sbacktrace_frame); | |
4a330052 | 3864 | defsubr (&Sspecial_variable_p); |
b9598260 | 3865 | defsubr (&Sfunctionp); |
db9f0278 | 3866 | } |