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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
acaf905b | 2 | Copyright (C) 1985-1987, 1993-1995, 1999-2012 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> |
4e2fe2e6 | 22 | #include <stdio.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 | ||
c2d7786e | 34 | struct backtrace *backtrace_list; |
244ed907 PE |
35 | |
36 | #if !BYTE_MARK_STACK | |
37 | static | |
38 | #endif | |
db9f0278 JB |
39 | struct catchtag *catchlist; |
40 | ||
244ed907 PE |
41 | /* Chain of condition handlers currently in effect. |
42 | The elements of this chain are contained in the stack frames | |
43 | of Fcondition_case and internal_condition_case. | |
44 | When an error is signaled (by calling Fsignal, below), | |
45 | this chain is searched for an element that applies. */ | |
46 | ||
47 | #if !BYTE_MARK_STACK | |
48 | static | |
49 | #endif | |
50 | struct handler *handlerlist; | |
51 | ||
15934ffa RS |
52 | #ifdef DEBUG_GCPRO |
53 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
54 | int gcpro_level; | |
55 | #endif | |
56 | ||
61b108cc | 57 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp; |
29208e82 | 58 | Lisp_Object Qinhibit_quit; |
955cbe7b PE |
59 | Lisp_Object Qand_rest; |
60 | static Lisp_Object Qand_optional; | |
45b82ad0 | 61 | static Lisp_Object Qinhibit_debugger; |
955cbe7b | 62 | static Lisp_Object Qdeclare; |
b9598260 SM |
63 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
64 | ||
ed008a6d | 65 | static Lisp_Object Qdebug; |
db9f0278 | 66 | |
6e6e9f08 RS |
67 | /* This holds either the symbol `run-hooks' or nil. |
68 | It is nil at an early stage of startup, and when Emacs | |
69 | is shutting down. */ | |
4c576a83 | 70 | |
db9f0278 JB |
71 | Lisp_Object Vrun_hooks; |
72 | ||
73 | /* Non-nil means record all fset's and provide's, to be undone | |
74 | if the file being autoloaded is not fully loaded. | |
75 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 76 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
77 | |
78 | Lisp_Object Vautoload_queue; | |
79 | ||
80 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 81 | |
d311d28c | 82 | ptrdiff_t specpdl_size; |
db9f0278 JB |
83 | |
84 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 85 | |
db9f0278 JB |
86 | struct specbinding *specpdl; |
87 | ||
88 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 89 | |
ab837828 | 90 | struct specbinding *specpdl_ptr; |
db9f0278 | 91 | |
db9f0278 | 92 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 93 | |
57a96f5c | 94 | static EMACS_INT lisp_eval_depth; |
db9f0278 | 95 | |
be857679 | 96 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 97 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 98 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
99 | know that the debugger itself has an error, and we should just |
100 | signal the error instead of entering an infinite loop of debugger | |
101 | invocations. */ | |
4c576a83 | 102 | |
d311d28c | 103 | static EMACS_INT when_entered_debugger; |
db9f0278 | 104 | |
a2ff3819 GM |
105 | /* The function from which the last `signal' was called. Set in |
106 | Fsignal. */ | |
107 | ||
108 | Lisp_Object Vsignaling_function; | |
109 | ||
d1f55f16 CY |
110 | /* If non-nil, Lisp code must not be run since some part of Emacs is |
111 | in an inconsistent state. Currently, x-create-frame uses this to | |
112 | avoid triggering window-configuration-change-hook while the new | |
113 | frame is half-initialized. */ | |
114 | Lisp_Object inhibit_lisp_code; | |
115 | ||
f66c7cf8 | 116 | static Lisp_Object funcall_lambda (Lisp_Object, ptrdiff_t, Lisp_Object *); |
7200d79c | 117 | static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args); |
e46f2325 DA |
118 | |
119 | /* Functions to set Lisp_Object slots of struct specbinding. */ | |
120 | ||
b0ab8123 | 121 | static void |
e46f2325 DA |
122 | set_specpdl_symbol (Lisp_Object symbol) |
123 | { | |
124 | specpdl_ptr->symbol = symbol; | |
125 | } | |
126 | ||
b0ab8123 | 127 | static void |
e46f2325 DA |
128 | set_specpdl_old_value (Lisp_Object oldval) |
129 | { | |
130 | specpdl_ptr->old_value = oldval; | |
131 | } | |
132 | ||
dfcf069d | 133 | void |
d3da34e0 | 134 | init_eval_once (void) |
db9f0278 | 135 | { |
98e8eae1 | 136 | enum { size = 50 }; |
38182d90 | 137 | specpdl = xmalloc (size * sizeof *specpdl); |
98e8eae1 | 138 | specpdl_size = size; |
270e8074 | 139 | specpdl_ptr = specpdl; |
6588243d | 140 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
c530e1c2 | 141 | max_specpdl_size = 1300; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 142 | max_lisp_eval_depth = 600; |
34d470ba RS |
143 | |
144 | Vrun_hooks = Qnil; | |
db9f0278 JB |
145 | } |
146 | ||
dfcf069d | 147 | void |
d3da34e0 | 148 | init_eval (void) |
db9f0278 JB |
149 | { |
150 | specpdl_ptr = specpdl; | |
151 | catchlist = 0; | |
152 | handlerlist = 0; | |
153 | backtrace_list = 0; | |
154 | Vquit_flag = Qnil; | |
155 | debug_on_next_call = 0; | |
156 | lisp_eval_depth = 0; | |
87e21fbd | 157 | #ifdef DEBUG_GCPRO |
15934ffa | 158 | gcpro_level = 0; |
87e21fbd | 159 | #endif |
be857679 | 160 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 161 | when_entered_debugger = -1; |
db9f0278 JB |
162 | } |
163 | ||
f6d62986 | 164 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb RS |
165 | |
166 | static Lisp_Object | |
d3da34e0 | 167 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
168 | { |
169 | max_specpdl_size = XINT (XCAR (data)); | |
170 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 171 | return Qnil; |
9f5903bb RS |
172 | } |
173 | ||
174 | /* Call the Lisp debugger, giving it argument ARG. */ | |
175 | ||
7f7e0167 | 176 | Lisp_Object |
d3da34e0 | 177 | call_debugger (Lisp_Object arg) |
db9f0278 | 178 | { |
1882aa38 | 179 | bool debug_while_redisplaying; |
d311d28c | 180 | ptrdiff_t count = SPECPDL_INDEX (); |
3648c842 | 181 | Lisp_Object val; |
5816888b | 182 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 183 | |
9f5903bb RS |
184 | /* Temporarily bump up the stack limits, |
185 | so the debugger won't run out of stack. */ | |
177c0ea7 | 186 | |
9f5903bb RS |
187 | max_specpdl_size += 1; |
188 | record_unwind_protect (restore_stack_limits, | |
189 | Fcons (make_number (old_max), | |
190 | make_number (max_lisp_eval_depth))); | |
191 | max_specpdl_size = old_max; | |
192 | ||
193 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
194 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
195 | ||
98e8eae1 | 196 | if (max_specpdl_size - 100 < SPECPDL_INDEX ()) |
9f5903bb | 197 | max_specpdl_size = SPECPDL_INDEX () + 100; |
177c0ea7 | 198 | |
d148e14d | 199 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
200 | if (display_hourglass_p) |
201 | cancel_hourglass (); | |
237c23b0 GM |
202 | #endif |
203 | ||
db9f0278 | 204 | debug_on_next_call = 0; |
be857679 | 205 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
206 | |
207 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
208 | displayed if the debugger is invoked during redisplay. */ | |
209 | debug_while_redisplaying = redisplaying_p; | |
210 | redisplaying_p = 0; | |
556d7314 GM |
211 | specbind (intern ("debugger-may-continue"), |
212 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 213 | specbind (Qinhibit_redisplay, Qnil); |
45b82ad0 | 214 | specbind (Qinhibit_debugger, Qt); |
9db6f6b4 GM |
215 | |
216 | #if 0 /* Binding this prevents execution of Lisp code during | |
217 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 218 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 219 | #endif |
177c0ea7 | 220 | |
3648c842 GM |
221 | val = apply1 (Vdebugger, arg); |
222 | ||
223 | /* Interrupting redisplay and resuming it later is not safe under | |
224 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 225 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
226 | if (debug_while_redisplaying) |
227 | Ftop_level (); | |
228 | ||
556d7314 | 229 | return unbind_to (count, val); |
db9f0278 JB |
230 | } |
231 | ||
475545b5 | 232 | static void |
d3da34e0 | 233 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
234 | { |
235 | debug_on_next_call = 0; | |
236 | backtrace_list->debug_on_exit = 1; | |
237 | call_debugger (Fcons (code, Qnil)); | |
238 | } | |
239 | \f | |
240 | /* NOTE!!! Every function that can call EVAL must protect its args | |
241 | and temporaries from garbage collection while it needs them. | |
242 | The definition of `For' shows what you have to do. */ | |
243 | ||
244 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
245 | doc: /* Eval args until one of them yields non-nil, then return that value. |
246 | The remaining args are not evalled at all. | |
247 | If all args return nil, return nil. | |
533eb34b | 248 | usage: (or CONDITIONS...) */) |
5842a27b | 249 | (Lisp_Object args) |
db9f0278 | 250 | { |
e509f168 | 251 | register Lisp_Object val = Qnil; |
db9f0278 JB |
252 | struct gcpro gcpro1; |
253 | ||
e509f168 | 254 | GCPRO1 (args); |
db9f0278 | 255 | |
e509f168 | 256 | while (CONSP (args)) |
db9f0278 | 257 | { |
defb1411 | 258 | val = eval_sub (XCAR (args)); |
265a9e55 | 259 | if (!NILP (val)) |
db9f0278 | 260 | break; |
e509f168 | 261 | args = XCDR (args); |
db9f0278 | 262 | } |
db9f0278 JB |
263 | |
264 | UNGCPRO; | |
265 | return val; | |
266 | } | |
267 | ||
268 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 269 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
270 | The remaining args are not evalled at all. |
271 | If no arg yields nil, return the last arg's value. | |
533eb34b | 272 | usage: (and CONDITIONS...) */) |
5842a27b | 273 | (Lisp_Object args) |
db9f0278 | 274 | { |
e509f168 | 275 | register Lisp_Object val = Qt; |
db9f0278 JB |
276 | struct gcpro gcpro1; |
277 | ||
e509f168 | 278 | GCPRO1 (args); |
db9f0278 | 279 | |
e509f168 | 280 | while (CONSP (args)) |
db9f0278 | 281 | { |
defb1411 | 282 | val = eval_sub (XCAR (args)); |
265a9e55 | 283 | if (NILP (val)) |
db9f0278 | 284 | break; |
e509f168 | 285 | args = XCDR (args); |
db9f0278 | 286 | } |
db9f0278 JB |
287 | |
288 | UNGCPRO; | |
289 | return val; | |
290 | } | |
291 | ||
292 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 293 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
294 | Returns the value of THEN or the value of the last of the ELSE's. |
295 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
296 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 297 | usage: (if COND THEN ELSE...) */) |
5842a27b | 298 | (Lisp_Object args) |
db9f0278 JB |
299 | { |
300 | register Lisp_Object cond; | |
301 | struct gcpro gcpro1; | |
302 | ||
303 | GCPRO1 (args); | |
defb1411 | 304 | cond = eval_sub (Fcar (args)); |
db9f0278 JB |
305 | UNGCPRO; |
306 | ||
265a9e55 | 307 | if (!NILP (cond)) |
defb1411 | 308 | return eval_sub (Fcar (Fcdr (args))); |
db9f0278 JB |
309 | return Fprogn (Fcdr (Fcdr (args))); |
310 | } | |
311 | ||
312 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
313 | doc: /* Try each clause until one succeeds. |
314 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
315 | and, if the value is non-nil, this clause succeeds: | |
316 | then the expressions in BODY are evaluated and the last one's | |
317 | value is the value of the cond-form. | |
318 | If no clause succeeds, cond returns nil. | |
319 | If a clause has one element, as in (CONDITION), | |
320 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 321 | usage: (cond CLAUSES...) */) |
5842a27b | 322 | (Lisp_Object args) |
db9f0278 JB |
323 | { |
324 | register Lisp_Object clause, val; | |
325 | struct gcpro gcpro1; | |
326 | ||
327 | val = Qnil; | |
328 | GCPRO1 (args); | |
265a9e55 | 329 | while (!NILP (args)) |
db9f0278 JB |
330 | { |
331 | clause = Fcar (args); | |
defb1411 | 332 | val = eval_sub (Fcar (clause)); |
265a9e55 | 333 | if (!NILP (val)) |
db9f0278 | 334 | { |
03699b14 KR |
335 | if (!EQ (XCDR (clause), Qnil)) |
336 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
337 | break; |
338 | } | |
03699b14 | 339 | args = XCDR (args); |
db9f0278 JB |
340 | } |
341 | UNGCPRO; | |
342 | ||
343 | return val; | |
344 | } | |
345 | ||
a7ca3326 | 346 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, |
9dbc9081 | 347 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 348 | usage: (progn BODY...) */) |
5842a27b | 349 | (Lisp_Object args) |
db9f0278 | 350 | { |
e509f168 | 351 | register Lisp_Object val = Qnil; |
db9f0278 JB |
352 | struct gcpro gcpro1; |
353 | ||
e509f168 | 354 | GCPRO1 (args); |
db9f0278 | 355 | |
e509f168 | 356 | while (CONSP (args)) |
db9f0278 | 357 | { |
defb1411 | 358 | val = eval_sub (XCAR (args)); |
e509f168 | 359 | args = XCDR (args); |
db9f0278 | 360 | } |
db9f0278 JB |
361 | |
362 | UNGCPRO; | |
363 | return val; | |
364 | } | |
365 | ||
366 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 367 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
368 | The value of FIRST is saved during the evaluation of the remaining args, |
369 | whose values are discarded. | |
7a25dc6d | 370 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 371 | (Lisp_Object args) |
db9f0278 JB |
372 | { |
373 | Lisp_Object val; | |
374 | register Lisp_Object args_left; | |
375 | struct gcpro gcpro1, gcpro2; | |
db9f0278 JB |
376 | |
377 | args_left = args; | |
378 | val = Qnil; | |
379 | GCPRO2 (args, val); | |
380 | ||
856bbc81 PE |
381 | val = eval_sub (XCAR (args_left)); |
382 | while (CONSP (args_left = XCDR (args_left))) | |
383 | eval_sub (XCAR (args_left)); | |
db9f0278 JB |
384 | |
385 | UNGCPRO; | |
386 | return val; | |
387 | } | |
388 | ||
389 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 390 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
391 | The value of FORM2 is saved during the evaluation of the |
392 | remaining args, whose values are discarded. | |
393 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 394 | (Lisp_Object args) |
db9f0278 | 395 | { |
856bbc81 | 396 | struct gcpro gcpro1; |
db9f0278 | 397 | |
856bbc81 | 398 | GCPRO1 (args); |
856bbc81 | 399 | eval_sub (XCAR (args)); |
a63df926 PE |
400 | UNGCPRO; |
401 | return Fprog1 (XCDR (args)); | |
db9f0278 JB |
402 | } |
403 | ||
404 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
405 | doc: /* Set each SYM to the value of its VAL. |
406 | The symbols SYM are variables; they are literal (not evaluated). | |
407 | The values VAL are expressions; they are evaluated. | |
408 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
409 | The second VAL is not computed until after the first SYM is set, and so on; | |
410 | each VAL can use the new value of variables set earlier in the `setq'. | |
411 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 412 | usage: (setq [SYM VAL]...) */) |
5842a27b | 413 | (Lisp_Object args) |
db9f0278 JB |
414 | { |
415 | register Lisp_Object args_left; | |
b9598260 | 416 | register Lisp_Object val, sym, lex_binding; |
db9f0278 JB |
417 | struct gcpro gcpro1; |
418 | ||
1283140e | 419 | if (NILP (args)) |
db9f0278 JB |
420 | return Qnil; |
421 | ||
422 | args_left = args; | |
423 | GCPRO1 (args); | |
424 | ||
425 | do | |
426 | { | |
defb1411 | 427 | val = eval_sub (Fcar (Fcdr (args_left))); |
db9f0278 | 428 | sym = Fcar (args_left); |
b9598260 | 429 | |
defb1411 | 430 | /* Like for eval_sub, we do not check declared_special here since |
f07a954e SM |
431 | it's been done when let-binding. */ |
432 | if (!NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
b9598260 | 433 | && SYMBOLP (sym) |
f07a954e SM |
434 | && !NILP (lex_binding |
435 | = Fassq (sym, Vinternal_interpreter_environment))) | |
b9598260 SM |
436 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ |
437 | else | |
438 | Fset (sym, val); /* SYM is dynamically bound. */ | |
439 | ||
db9f0278 JB |
440 | args_left = Fcdr (Fcdr (args_left)); |
441 | } | |
5e617bc2 | 442 | while (!NILP (args_left)); |
db9f0278 JB |
443 | |
444 | UNGCPRO; | |
445 | return val; | |
446 | } | |
177c0ea7 | 447 | |
db9f0278 | 448 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 | 449 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
91a15bc6 SM |
450 | Warning: `quote' does not construct its return value, but just returns |
451 | the value that was pre-constructed by the Lisp reader (see info node | |
452 | `(elisp)Printed Representation'). | |
453 | This means that '(a . b) is not identical to (cons 'a 'b): the former | |
454 | does not cons. Quoting should be reserved for constants that will | |
455 | never be modified by side-effects, unless you like self-modifying code. | |
456 | See the common pitfall in info node `(elisp)Rearrangement' for an example | |
457 | of unexpected results when a quoted object is modified. | |
9dbc9081 | 458 | usage: (quote ARG) */) |
5842a27b | 459 | (Lisp_Object args) |
db9f0278 | 460 | { |
1283140e RS |
461 | if (!NILP (Fcdr (args))) |
462 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
463 | return Fcar (args); |
464 | } | |
177c0ea7 | 465 | |
db9f0278 | 466 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
467 | doc: /* Like `quote', but preferred for objects which are functions. |
468 | In byte compilation, `function' causes its argument to be compiled. | |
469 | `quote' cannot do that. | |
470 | usage: (function ARG) */) | |
5842a27b | 471 | (Lisp_Object args) |
db9f0278 | 472 | { |
b9598260 SM |
473 | Lisp_Object quoted = XCAR (args); |
474 | ||
1283140e RS |
475 | if (!NILP (Fcdr (args))) |
476 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
b9598260 SM |
477 | |
478 | if (!NILP (Vinternal_interpreter_environment) | |
479 | && CONSP (quoted) | |
480 | && EQ (XCAR (quoted), Qlambda)) | |
481 | /* This is a lambda expression within a lexical environment; | |
482 | return an interpreted closure instead of a simple lambda. */ | |
23aba0ea SM |
483 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, |
484 | XCDR (quoted))); | |
b9598260 SM |
485 | else |
486 | /* Simply quote the argument. */ | |
487 | return quoted; | |
db9f0278 JB |
488 | } |
489 | ||
e0f331ab | 490 | |
1848d15d | 491 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 492 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 493 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 494 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
495 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
496 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
497 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
498 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 499 | The return value is BASE-VARIABLE. */) |
5842a27b | 500 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
501 | { |
502 | struct Lisp_Symbol *sym; | |
1848d15d | 503 | |
4a9308b8 JB |
504 | CHECK_SYMBOL (new_alias); |
505 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 506 | |
4a9308b8 | 507 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
508 | |
509 | if (sym->constant) | |
178f2507 SM |
510 | /* Not sure why, but why not? */ |
511 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
512 | |
513 | switch (sym->redirect) | |
514 | { | |
515 | case SYMBOL_FORWARDED: | |
516 | error ("Cannot make an internal variable an alias"); | |
517 | case SYMBOL_LOCALIZED: | |
518 | error ("Don't know how to make a localized variable an alias"); | |
519 | } | |
520 | ||
dd60787c | 521 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
522 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
523 | so that old-code that affects n_a before the aliasing is setup | |
524 | still works. */ | |
525 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 526 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
527 | |
528 | { | |
529 | struct specbinding *p; | |
530 | ||
bc985141 | 531 | for (p = specpdl_ptr; p > specpdl; ) |
d311d28c | 532 | if ((--p)->func == NULL |
ce5b453a SM |
533 | && (EQ (new_alias, |
534 | CONSP (p->symbol) ? XCAR (p->symbol) : p->symbol))) | |
535 | error ("Don't know how to make a let-bound variable an alias"); | |
536 | } | |
537 | ||
b9598260 | 538 | sym->declared_special = 1; |
0ac30604 | 539 | XSYMBOL (base_variable)->declared_special = 1; |
ce5b453a SM |
540 | sym->redirect = SYMBOL_VARALIAS; |
541 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
542 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
543 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
544 | /* Even if docstring is nil: remove old docstring. */ |
545 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 546 | |
4a9308b8 | 547 | return base_variable; |
19cebf5a GM |
548 | } |
549 | ||
550 | ||
db9f0278 | 551 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 552 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
c3a70e2b CY |
553 | You are not required to define a variable in order to use it, but |
554 | defining it lets you supply an initial value and documentation, which | |
555 | can be referred to by the Emacs help facilities and other programming | |
556 | tools. The `defvar' form also declares the variable as \"special\", | |
557 | so that it is always dynamically bound even if `lexical-binding' is t. | |
558 | ||
559 | The optional argument INITVALUE is evaluated, and used to set SYMBOL, | |
560 | only if SYMBOL's value is void. If SYMBOL is buffer-local, its | |
561 | default value is what is set; buffer-local values are not affected. | |
9dbc9081 | 562 | If INITVALUE is missing, SYMBOL's value is not set. |
733f68b6 LT |
563 | |
564 | If SYMBOL has a local binding, then this form affects the local | |
565 | binding. This is usually not what you want. Thus, if you need to | |
566 | load a file defining variables, with this form or with `defconst' or | |
567 | `defcustom', you should always load that file _outside_ any bindings | |
568 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
569 | this respect.) | |
c3a70e2b CY |
570 | |
571 | The optional argument DOCSTRING is a documentation string for the | |
572 | variable. | |
573 | ||
574 | To define a user option, use `defcustom' instead of `defvar'. | |
2df5238c | 575 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 576 | (Lisp_Object args) |
db9f0278 | 577 | { |
a42ba017 | 578 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
579 | |
580 | sym = Fcar (args); | |
a42ba017 RS |
581 | tail = Fcdr (args); |
582 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 583 | error ("Too many arguments"); |
a42ba017 | 584 | |
33568849 | 585 | tem = Fdefault_boundp (sym); |
a42ba017 | 586 | if (!NILP (tail)) |
db9f0278 | 587 | { |
ba83908c SM |
588 | /* Do it before evaluating the initial value, for self-references. */ |
589 | XSYMBOL (sym)->declared_special = 1; | |
590130fb | 590 | |
265a9e55 | 591 | if (NILP (tem)) |
defb1411 | 592 | Fset_default (sym, eval_sub (Fcar (tail))); |
d0bce91e SM |
593 | else |
594 | { /* Check if there is really a global binding rather than just a let | |
595 | binding that shadows the global unboundness of the var. */ | |
40bce90b | 596 | struct specbinding *pdl = specpdl_ptr; |
d311d28c | 597 | while (pdl > specpdl) |
d0bce91e | 598 | { |
d311d28c | 599 | if (EQ ((--pdl)->symbol, sym) && !pdl->func |
d0bce91e SM |
600 | && EQ (pdl->old_value, Qunbound)) |
601 | { | |
23ba2705 SM |
602 | message_with_string |
603 | ("Warning: defvar ignored because %s is let-bound", | |
604 | SYMBOL_NAME (sym), 1); | |
d0bce91e SM |
605 | break; |
606 | } | |
607 | } | |
608 | } | |
33568849 | 609 | tail = Fcdr (tail); |
e509f168 SM |
610 | tem = Fcar (tail); |
611 | if (!NILP (tem)) | |
33568849 | 612 | { |
33568849 SM |
613 | if (!NILP (Vpurify_flag)) |
614 | tem = Fpurecopy (tem); | |
615 | Fput (sym, Qvariable_documentation, tem); | |
616 | } | |
6fd797f5 | 617 | LOADHIST_ATTACH (sym); |
db9f0278 | 618 | } |
f07a954e SM |
619 | else if (!NILP (Vinternal_interpreter_environment) |
620 | && !XSYMBOL (sym)->declared_special) | |
621 | /* A simple (defvar foo) with lexical scoping does "nothing" except | |
622 | declare that var to be dynamically scoped *locally* (i.e. within | |
623 | the current file or let-block). */ | |
23ba2705 SM |
624 | Vinternal_interpreter_environment |
625 | = Fcons (sym, Vinternal_interpreter_environment); | |
33568849 | 626 | else |
d28a2170 PE |
627 | { |
628 | /* Simple (defvar <var>) should not count as a definition at all. | |
629 | It could get in the way of other definitions, and unloading this | |
630 | package could try to make the variable unbound. */ | |
631 | } | |
addf35fd | 632 | |
db9f0278 JB |
633 | return sym; |
634 | } | |
635 | ||
636 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 | 637 | doc: /* Define SYMBOL as a constant variable. |
c3a70e2b CY |
638 | This declares that neither programs nor users should ever change the |
639 | value. This constancy is not actually enforced by Emacs Lisp, but | |
640 | SYMBOL is marked as a special variable so that it is never lexically | |
641 | bound. | |
642 | ||
643 | The `defconst' form always sets the value of SYMBOL to the result of | |
644 | evalling INITVALUE. If SYMBOL is buffer-local, its default value is | |
645 | what is set; buffer-local values are not affected. If SYMBOL has a | |
646 | local binding, then this form sets the local binding's value. | |
647 | However, you should normally not make local bindings for variables | |
648 | defined with this form. | |
649 | ||
650 | The optional DOCSTRING specifies the variable's documentation string. | |
7a25dc6d | 651 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 652 | (Lisp_Object args) |
db9f0278 JB |
653 | { |
654 | register Lisp_Object sym, tem; | |
655 | ||
656 | sym = Fcar (args); | |
a42ba017 | 657 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 658 | error ("Too many arguments"); |
a42ba017 | 659 | |
defb1411 | 660 | tem = eval_sub (Fcar (Fcdr (args))); |
1182a7cb DL |
661 | if (!NILP (Vpurify_flag)) |
662 | tem = Fpurecopy (tem); | |
663 | Fset_default (sym, tem); | |
b9598260 | 664 | XSYMBOL (sym)->declared_special = 1; |
db9f0278 | 665 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 666 | if (!NILP (tem)) |
db9f0278 | 667 | { |
265a9e55 | 668 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
669 | tem = Fpurecopy (tem); |
670 | Fput (sym, Qvariable_documentation, tem); | |
671 | } | |
873759d5 | 672 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 673 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
674 | return sym; |
675 | } | |
676 | ||
513749ee SM |
677 | /* Make SYMBOL lexically scoped. */ |
678 | DEFUN ("internal-make-var-non-special", Fmake_var_non_special, | |
679 | Smake_var_non_special, 1, 1, 0, | |
680 | doc: /* Internal function. */) | |
681 | (Lisp_Object symbol) | |
682 | { | |
683 | CHECK_SYMBOL (symbol); | |
684 | XSYMBOL (symbol)->declared_special = 0; | |
685 | return Qnil; | |
686 | } | |
687 | ||
db9f0278 JB |
688 | \f |
689 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
690 | doc: /* Bind variables according to VARLIST then eval BODY. |
691 | The value of the last form in BODY is returned. | |
692 | Each element of VARLIST is a symbol (which is bound to nil) | |
693 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
694 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 695 | usage: (let* VARLIST BODY...) */) |
5842a27b | 696 | (Lisp_Object args) |
db9f0278 | 697 | { |
b9598260 | 698 | Lisp_Object varlist, var, val, elt, lexenv; |
d311d28c | 699 | ptrdiff_t count = SPECPDL_INDEX (); |
db9f0278 JB |
700 | struct gcpro gcpro1, gcpro2, gcpro3; |
701 | ||
702 | GCPRO3 (args, elt, varlist); | |
703 | ||
b9598260 SM |
704 | lexenv = Vinternal_interpreter_environment; |
705 | ||
db9f0278 | 706 | varlist = Fcar (args); |
b9598260 | 707 | while (CONSP (varlist)) |
db9f0278 JB |
708 | { |
709 | QUIT; | |
b9598260 SM |
710 | |
711 | elt = XCAR (varlist); | |
90165123 | 712 | if (SYMBOLP (elt)) |
b9598260 SM |
713 | { |
714 | var = elt; | |
715 | val = Qnil; | |
716 | } | |
08564963 | 717 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 718 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
719 | else |
720 | { | |
b9598260 | 721 | var = Fcar (elt); |
defb1411 | 722 | val = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 | 723 | } |
b9598260 | 724 | |
f07a954e SM |
725 | if (!NILP (lexenv) && SYMBOLP (var) |
726 | && !XSYMBOL (var)->declared_special | |
727 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
728 | /* Lexically bind VAR by adding it to the interpreter's binding |
729 | alist. */ | |
730 | { | |
f07a954e SM |
731 | Lisp_Object newenv |
732 | = Fcons (Fcons (var, val), Vinternal_interpreter_environment); | |
733 | if (EQ (Vinternal_interpreter_environment, lexenv)) | |
734 | /* Save the old lexical environment on the specpdl stack, | |
735 | but only for the first lexical binding, since we'll never | |
736 | need to revert to one of the intermediate ones. */ | |
737 | specbind (Qinternal_interpreter_environment, newenv); | |
738 | else | |
739 | Vinternal_interpreter_environment = newenv; | |
db9f0278 | 740 | } |
b9598260 SM |
741 | else |
742 | specbind (var, val); | |
743 | ||
744 | varlist = XCDR (varlist); | |
db9f0278 JB |
745 | } |
746 | UNGCPRO; | |
747 | val = Fprogn (Fcdr (args)); | |
748 | return unbind_to (count, val); | |
749 | } | |
750 | ||
751 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
752 | doc: /* Bind variables according to VARLIST then eval BODY. |
753 | The value of the last form in BODY is returned. | |
754 | Each element of VARLIST is a symbol (which is bound to nil) | |
755 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
756 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 757 | usage: (let VARLIST BODY...) */) |
5842a27b | 758 | (Lisp_Object args) |
db9f0278 | 759 | { |
b9598260 | 760 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 761 | register Lisp_Object elt, varlist; |
d311d28c | 762 | ptrdiff_t count = SPECPDL_INDEX (); |
f66c7cf8 | 763 | ptrdiff_t argnum; |
db9f0278 | 764 | struct gcpro gcpro1, gcpro2; |
3a7a9129 | 765 | USE_SAFE_ALLOCA; |
db9f0278 JB |
766 | |
767 | varlist = Fcar (args); | |
768 | ||
f6d62986 | 769 | /* Make space to hold the values to give the bound variables. */ |
db9f0278 | 770 | elt = Flength (varlist); |
b72e0717 | 771 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 | 772 | |
f6d62986 | 773 | /* Compute the values and store them in `temps'. */ |
db9f0278 JB |
774 | |
775 | GCPRO2 (args, *temps); | |
776 | gcpro2.nvars = 0; | |
777 | ||
67ee9f6e | 778 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
779 | { |
780 | QUIT; | |
67ee9f6e | 781 | elt = XCAR (varlist); |
90165123 | 782 | if (SYMBOLP (elt)) |
db9f0278 | 783 | temps [argnum++] = Qnil; |
08564963 | 784 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 785 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 | 786 | else |
defb1411 | 787 | temps [argnum++] = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 JB |
788 | gcpro2.nvars = argnum; |
789 | } | |
790 | UNGCPRO; | |
791 | ||
b9598260 SM |
792 | lexenv = Vinternal_interpreter_environment; |
793 | ||
db9f0278 | 794 | varlist = Fcar (args); |
67ee9f6e | 795 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 796 | { |
b9598260 SM |
797 | Lisp_Object var; |
798 | ||
67ee9f6e | 799 | elt = XCAR (varlist); |
b9598260 | 800 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 801 | tem = temps[argnum++]; |
b9598260 | 802 | |
f07a954e SM |
803 | if (!NILP (lexenv) && SYMBOLP (var) |
804 | && !XSYMBOL (var)->declared_special | |
805 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
806 | /* Lexically bind VAR by adding it to the lexenv alist. */ |
807 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 808 | else |
b9598260 SM |
809 | /* Dynamically bind VAR. */ |
810 | specbind (var, tem); | |
db9f0278 JB |
811 | } |
812 | ||
b9598260 SM |
813 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
814 | /* Instantiate a new lexical environment. */ | |
815 | specbind (Qinternal_interpreter_environment, lexenv); | |
816 | ||
db9f0278 | 817 | elt = Fprogn (Fcdr (args)); |
3a7a9129 | 818 | SAFE_FREE (); |
db9f0278 JB |
819 | return unbind_to (count, elt); |
820 | } | |
821 | ||
822 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
823 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
824 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
825 | until TEST returns nil. | |
7a25dc6d | 826 | usage: (while TEST BODY...) */) |
5842a27b | 827 | (Lisp_Object args) |
db9f0278 | 828 | { |
2b9bde76 | 829 | Lisp_Object test, body; |
db9f0278 JB |
830 | struct gcpro gcpro1, gcpro2; |
831 | ||
832 | GCPRO2 (test, body); | |
833 | ||
834 | test = Fcar (args); | |
835 | body = Fcdr (args); | |
defb1411 | 836 | while (!NILP (eval_sub (test))) |
db9f0278 JB |
837 | { |
838 | QUIT; | |
839 | Fprogn (body); | |
840 | } | |
841 | ||
842 | UNGCPRO; | |
843 | return Qnil; | |
844 | } | |
845 | ||
846 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
847 | doc: /* Return result of expanding macros at top level of FORM. |
848 | If FORM is not a macro call, it is returned unchanged. | |
849 | Otherwise, the macro is expanded and the expansion is considered | |
850 | in place of FORM. When a non-macro-call results, it is returned. | |
851 | ||
852 | The second optional arg ENVIRONMENT specifies an environment of macro | |
853 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 854 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 855 | { |
23d6b5a6 | 856 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
857 | register Lisp_Object expander, sym, def, tem; |
858 | ||
859 | while (1) | |
860 | { | |
861 | /* Come back here each time we expand a macro call, | |
862 | in case it expands into another macro call. */ | |
90165123 | 863 | if (!CONSP (form)) |
db9f0278 | 864 | break; |
23d6b5a6 | 865 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 866 | def = sym = XCAR (form); |
23d6b5a6 | 867 | tem = Qnil; |
db9f0278 JB |
868 | /* Trace symbols aliases to other symbols |
869 | until we get a symbol that is not an alias. */ | |
90165123 | 870 | while (SYMBOLP (def)) |
db9f0278 JB |
871 | { |
872 | QUIT; | |
23d6b5a6 | 873 | sym = def; |
79e8bfbf | 874 | tem = Fassq (sym, environment); |
265a9e55 | 875 | if (NILP (tem)) |
db9f0278 | 876 | { |
c644523b | 877 | def = XSYMBOL (sym)->function; |
eadf1faa | 878 | if (!NILP (def)) |
23d6b5a6 | 879 | continue; |
db9f0278 | 880 | } |
23d6b5a6 | 881 | break; |
db9f0278 | 882 | } |
79e8bfbf | 883 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 884 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 885 | if (NILP (tem)) |
db9f0278 | 886 | { |
79e8bfbf | 887 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 888 | Look at its function definition. */ |
7abaf5cc SM |
889 | struct gcpro gcpro1; |
890 | GCPRO1 (form); | |
891 | def = Fautoload_do_load (def, sym, Qmacro); | |
892 | UNGCPRO; | |
eadf1faa | 893 | if (!CONSP (def)) |
f6d62986 | 894 | /* Not defined or definition not suitable. */ |
db9f0278 | 895 | break; |
7abaf5cc | 896 | if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 897 | break; |
03699b14 | 898 | else expander = XCDR (def); |
db9f0278 JB |
899 | } |
900 | else | |
901 | { | |
03699b14 | 902 | expander = XCDR (tem); |
265a9e55 | 903 | if (NILP (expander)) |
db9f0278 JB |
904 | break; |
905 | } | |
4f18a4ed SM |
906 | { |
907 | Lisp_Object newform = apply1 (expander, XCDR (form)); | |
908 | if (EQ (form, newform)) | |
909 | break; | |
910 | else | |
911 | form = newform; | |
912 | } | |
db9f0278 JB |
913 | } |
914 | return form; | |
915 | } | |
916 | \f | |
917 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
918 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
919 | TAG is evalled to get the tag to use; it must not be nil. | |
920 | ||
921 | Then the BODY is executed. | |
1d632ccf | 922 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
923 | If no throw happens, `catch' returns the value of the last BODY form. |
924 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 925 | usage: (catch TAG BODY...) */) |
5842a27b | 926 | (Lisp_Object args) |
db9f0278 JB |
927 | { |
928 | register Lisp_Object tag; | |
929 | struct gcpro gcpro1; | |
930 | ||
931 | GCPRO1 (args); | |
defb1411 | 932 | tag = eval_sub (Fcar (args)); |
db9f0278 JB |
933 | UNGCPRO; |
934 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
935 | } | |
936 | ||
937 | /* Set up a catch, then call C function FUNC on argument ARG. | |
938 | FUNC should return a Lisp_Object. | |
939 | This is how catches are done from within C code. */ | |
940 | ||
941 | Lisp_Object | |
d3da34e0 | 942 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
943 | { |
944 | /* This structure is made part of the chain `catchlist'. */ | |
945 | struct catchtag c; | |
946 | ||
947 | /* Fill in the components of c, and put it on the list. */ | |
948 | c.next = catchlist; | |
949 | c.tag = tag; | |
950 | c.val = Qnil; | |
951 | c.backlist = backtrace_list; | |
952 | c.handlerlist = handlerlist; | |
953 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 954 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 955 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 956 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 957 | c.gcpro = gcprolist; |
bcf28080 | 958 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
959 | catchlist = &c; |
960 | ||
961 | /* Call FUNC. */ | |
0328b6de | 962 | if (! sys_setjmp (c.jmp)) |
db9f0278 JB |
963 | c.val = (*func) (arg); |
964 | ||
965 | /* Throw works by a longjmp that comes right here. */ | |
966 | catchlist = c.next; | |
967 | return c.val; | |
968 | } | |
969 | ||
ba410f40 JB |
970 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
971 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 972 | |
4d7e6e51 | 973 | This is the guts of Fthrow and Fsignal; they differ only in the way |
ba410f40 JB |
974 | they choose the catch tag to throw to. A catch tag for a |
975 | condition-case form has a TAG of Qnil. | |
db9f0278 | 976 | |
ba410f40 JB |
977 | Before each catch is discarded, unbind all special bindings and |
978 | execute all unwind-protect clauses made above that catch. Unwind | |
979 | the handler stack as we go, so that the proper handlers are in | |
980 | effect for each unwind-protect clause we run. At the end, restore | |
981 | some static info saved in CATCH, and longjmp to the location | |
4d7e6e51 | 982 | specified there. |
ba410f40 JB |
983 | |
984 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 | 985 | |
845ca893 | 986 | static _Noreturn void |
d3da34e0 | 987 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 | 988 | { |
1882aa38 | 989 | bool last_time; |
db9f0278 | 990 | |
ba410f40 JB |
991 | /* Save the value in the tag. */ |
992 | catch->val = value; | |
993 | ||
0b31741c | 994 | /* Restore certain special C variables. */ |
1cdc3155 | 995 | set_poll_suppress_count (catch->poll_suppress_count); |
4d7e6e51 | 996 | unblock_input_to (catch->interrupt_input_blocked); |
69bbd6bd | 997 | immediate_quit = 0; |
82da7701 | 998 | |
db9f0278 JB |
999 | do |
1000 | { | |
1001 | last_time = catchlist == catch; | |
82da7701 JB |
1002 | |
1003 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1004 | handlers. */ |
db9f0278 JB |
1005 | unbind_to (catchlist->pdlcount, Qnil); |
1006 | handlerlist = catchlist->handlerlist; | |
1007 | catchlist = catchlist->next; | |
1008 | } | |
1009 | while (! last_time); | |
1010 | ||
bcf28080 | 1011 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1012 | gcprolist = catch->gcpro; |
15934ffa | 1013 | #ifdef DEBUG_GCPRO |
d8e2b5ba | 1014 | gcpro_level = gcprolist ? gcprolist->level + 1 : 0; |
15934ffa | 1015 | #endif |
db9f0278 JB |
1016 | backtrace_list = catch->backlist; |
1017 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1018 | |
0328b6de | 1019 | sys_longjmp (catch->jmp, 1); |
db9f0278 JB |
1020 | } |
1021 | ||
a7ca3326 | 1022 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, |
9dbc9081 PJ |
1023 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1024 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1025 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1026 | { |
1027 | register struct catchtag *c; | |
1028 | ||
8788120f KS |
1029 | if (!NILP (tag)) |
1030 | for (c = catchlist; c; c = c->next) | |
1031 | { | |
1032 | if (EQ (c->tag, tag)) | |
1033 | unwind_to_catch (c, value); | |
1034 | } | |
734d55a2 | 1035 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1036 | } |
1037 | ||
1038 | ||
1039 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1040 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1041 | If BODYFORM completes normally, its value is returned | |
1042 | after executing the UNWINDFORMS. | |
1043 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1044 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1045 | (Lisp_Object args) |
db9f0278 JB |
1046 | { |
1047 | Lisp_Object val; | |
d311d28c | 1048 | ptrdiff_t count = SPECPDL_INDEX (); |
db9f0278 | 1049 | |
04b28167 | 1050 | record_unwind_protect (Fprogn, Fcdr (args)); |
defb1411 | 1051 | val = eval_sub (Fcar (args)); |
177c0ea7 | 1052 | return unbind_to (count, val); |
db9f0278 JB |
1053 | } |
1054 | \f | |
db9f0278 | 1055 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, |
9dbc9081 | 1056 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1057 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1058 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1059 | where the BODY is made of Lisp expressions. | |
1060 | ||
1061 | A handler is applicable to an error | |
1062 | if CONDITION-NAME is one of the error's condition names. | |
1063 | If an error happens, the first applicable handler is run. | |
1064 | ||
024a2d76 CY |
1065 | The car of a handler may be a list of condition names instead of a |
1066 | single condition name; then it handles all of them. If the special | |
1067 | condition name `debug' is present in this list, it allows another | |
1068 | condition in the list to run the debugger if `debug-on-error' and the | |
1069 | other usual mechanisms says it should (otherwise, `condition-case' | |
1070 | suppresses the debugger). | |
9dbc9081 | 1071 | |
c997bb25 RS |
1072 | When a handler handles an error, control returns to the `condition-case' |
1073 | and it executes the handler's BODY... | |
d0acbbaf | 1074 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1075 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1076 | Then the value of the last BODY form is returned from the `condition-case' |
1077 | expression. | |
9dbc9081 | 1078 | |
9dbc9081 | 1079 | See also the function `signal' for more info. |
2b47b74d | 1080 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1081 | (Lisp_Object args) |
db9f0278 | 1082 | { |
40bce90b PE |
1083 | Lisp_Object var = Fcar (args); |
1084 | Lisp_Object bodyform = Fcar (Fcdr (args)); | |
1085 | Lisp_Object handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1086 | |
1087 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1088 | } | |
1089 | ||
1090 | /* Like Fcondition_case, but the args are separate | |
1091 | rather than passed in a list. Used by Fbyte_code. */ | |
1092 | ||
1093 | Lisp_Object | |
d3da34e0 JB |
1094 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1095 | Lisp_Object handlers) | |
ee830945 RS |
1096 | { |
1097 | Lisp_Object val; | |
1098 | struct catchtag c; | |
1099 | struct handler h; | |
1100 | ||
b7826503 | 1101 | CHECK_SYMBOL (var); |
82da7701 | 1102 | |
2b47b74d | 1103 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1104 | { |
1105 | Lisp_Object tem; | |
2b47b74d | 1106 | tem = XCAR (val); |
5f96776a RS |
1107 | if (! (NILP (tem) |
1108 | || (CONSP (tem) | |
03699b14 KR |
1109 | && (SYMBOLP (XCAR (tem)) |
1110 | || CONSP (XCAR (tem)))))) | |
e6c3da20 EZ |
1111 | error ("Invalid condition handler: %s", |
1112 | SDATA (Fprin1_to_string (tem, Qt))); | |
82da7701 | 1113 | } |
db9f0278 JB |
1114 | |
1115 | c.tag = Qnil; | |
1116 | c.val = Qnil; | |
1117 | c.backlist = backtrace_list; | |
1118 | c.handlerlist = handlerlist; | |
1119 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1120 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1121 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1122 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1123 | c.gcpro = gcprolist; |
bcf28080 | 1124 | c.byte_stack = byte_stack_list; |
0328b6de | 1125 | if (sys_setjmp (c.jmp)) |
db9f0278 | 1126 | { |
265a9e55 | 1127 | if (!NILP (h.var)) |
bb8e180f | 1128 | specbind (h.var, c.val); |
9d58218c | 1129 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1130 | |
1131 | /* Note that this just undoes the binding of h.var; whoever | |
1132 | longjumped to us unwound the stack to c.pdlcount before | |
1133 | throwing. */ | |
db9f0278 JB |
1134 | unbind_to (c.pdlcount, Qnil); |
1135 | return val; | |
1136 | } | |
1137 | c.next = catchlist; | |
1138 | catchlist = &c; | |
177c0ea7 | 1139 | |
82da7701 JB |
1140 | h.var = var; |
1141 | h.handler = handlers; | |
db9f0278 | 1142 | h.next = handlerlist; |
db9f0278 JB |
1143 | h.tag = &c; |
1144 | handlerlist = &h; | |
1145 | ||
defb1411 | 1146 | val = eval_sub (bodyform); |
db9f0278 JB |
1147 | catchlist = c.next; |
1148 | handlerlist = h.next; | |
1149 | return val; | |
1150 | } | |
1151 | ||
f029ca5f RS |
1152 | /* Call the function BFUN with no arguments, catching errors within it |
1153 | according to HANDLERS. If there is an error, call HFUN with | |
1154 | one argument which is the data that describes the error: | |
1155 | (SIGNALNAME . DATA) | |
1156 | ||
1157 | HANDLERS can be a list of conditions to catch. | |
1158 | If HANDLERS is Qt, catch all errors. | |
1159 | If HANDLERS is Qerror, catch all errors | |
1160 | but allow the debugger to run if that is enabled. */ | |
1161 | ||
db9f0278 | 1162 | Lisp_Object |
d3da34e0 JB |
1163 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1164 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1165 | { |
1166 | Lisp_Object val; | |
1167 | struct catchtag c; | |
1168 | struct handler h; | |
1169 | ||
1170 | c.tag = Qnil; | |
1171 | c.val = Qnil; | |
1172 | c.backlist = backtrace_list; | |
1173 | c.handlerlist = handlerlist; | |
1174 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1175 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1176 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1177 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1178 | c.gcpro = gcprolist; |
bcf28080 | 1179 | c.byte_stack = byte_stack_list; |
0328b6de | 1180 | if (sys_setjmp (c.jmp)) |
db9f0278 | 1181 | { |
9d58218c | 1182 | return (*hfun) (c.val); |
db9f0278 JB |
1183 | } |
1184 | c.next = catchlist; | |
1185 | catchlist = &c; | |
1186 | h.handler = handlers; | |
1187 | h.var = Qnil; | |
db9f0278 JB |
1188 | h.next = handlerlist; |
1189 | h.tag = &c; | |
1190 | handlerlist = &h; | |
1191 | ||
1192 | val = (*bfun) (); | |
1193 | catchlist = c.next; | |
1194 | handlerlist = h.next; | |
1195 | return val; | |
1196 | } | |
1197 | ||
2659a09f | 1198 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1199 | |
d227775c | 1200 | Lisp_Object |
d3da34e0 JB |
1201 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1202 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1203 | { |
1204 | Lisp_Object val; | |
1205 | struct catchtag c; | |
1206 | struct handler h; | |
1207 | ||
1208 | c.tag = Qnil; | |
1209 | c.val = Qnil; | |
1210 | c.backlist = backtrace_list; | |
1211 | c.handlerlist = handlerlist; | |
1212 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1213 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1214 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1215 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1216 | c.gcpro = gcprolist; |
bcf28080 | 1217 | c.byte_stack = byte_stack_list; |
0328b6de | 1218 | if (sys_setjmp (c.jmp)) |
d227775c | 1219 | { |
9d58218c | 1220 | return (*hfun) (c.val); |
d227775c RS |
1221 | } |
1222 | c.next = catchlist; | |
1223 | catchlist = &c; | |
1224 | h.handler = handlers; | |
1225 | h.var = Qnil; | |
1226 | h.next = handlerlist; | |
1227 | h.tag = &c; | |
1228 | handlerlist = &h; | |
1229 | ||
1230 | val = (*bfun) (arg); | |
1231 | catchlist = c.next; | |
1232 | handlerlist = h.next; | |
1233 | return val; | |
1234 | } | |
10b29d41 | 1235 | |
53967e09 CY |
1236 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1237 | its arguments. */ | |
1238 | ||
1239 | Lisp_Object | |
178f2507 SM |
1240 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1241 | Lisp_Object arg1, | |
1242 | Lisp_Object arg2, | |
1243 | Lisp_Object handlers, | |
1244 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1245 | { |
1246 | Lisp_Object val; | |
1247 | struct catchtag c; | |
1248 | struct handler h; | |
1249 | ||
53967e09 CY |
1250 | c.tag = Qnil; |
1251 | c.val = Qnil; | |
1252 | c.backlist = backtrace_list; | |
1253 | c.handlerlist = handlerlist; | |
1254 | c.lisp_eval_depth = lisp_eval_depth; | |
1255 | c.pdlcount = SPECPDL_INDEX (); | |
1256 | c.poll_suppress_count = poll_suppress_count; | |
1257 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1258 | c.gcpro = gcprolist; | |
1259 | c.byte_stack = byte_stack_list; | |
0328b6de | 1260 | if (sys_setjmp (c.jmp)) |
53967e09 CY |
1261 | { |
1262 | return (*hfun) (c.val); | |
1263 | } | |
1264 | c.next = catchlist; | |
1265 | catchlist = &c; | |
1266 | h.handler = handlers; | |
1267 | h.var = Qnil; | |
1268 | h.next = handlerlist; | |
1269 | h.tag = &c; | |
1270 | handlerlist = &h; | |
1271 | ||
1272 | val = (*bfun) (arg1, arg2); | |
1273 | catchlist = c.next; | |
1274 | handlerlist = h.next; | |
1275 | return val; | |
1276 | } | |
10b29d41 | 1277 | |
2659a09f | 1278 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1279 | and ARGS as second argument. */ |
1280 | ||
1281 | Lisp_Object | |
f66c7cf8 PE |
1282 | internal_condition_case_n (Lisp_Object (*bfun) (ptrdiff_t, Lisp_Object *), |
1283 | ptrdiff_t nargs, | |
178f2507 SM |
1284 | Lisp_Object *args, |
1285 | Lisp_Object handlers, | |
cc92c454 SM |
1286 | Lisp_Object (*hfun) (Lisp_Object err, |
1287 | ptrdiff_t nargs, | |
1288 | Lisp_Object *args)) | |
10b29d41 GM |
1289 | { |
1290 | Lisp_Object val; | |
1291 | struct catchtag c; | |
1292 | struct handler h; | |
1293 | ||
1294 | c.tag = Qnil; | |
1295 | c.val = Qnil; | |
1296 | c.backlist = backtrace_list; | |
1297 | c.handlerlist = handlerlist; | |
1298 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1299 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1300 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1301 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1302 | c.gcpro = gcprolist; |
1303 | c.byte_stack = byte_stack_list; | |
0328b6de | 1304 | if (sys_setjmp (c.jmp)) |
10b29d41 | 1305 | { |
cc92c454 | 1306 | return (*hfun) (c.val, nargs, args); |
10b29d41 GM |
1307 | } |
1308 | c.next = catchlist; | |
1309 | catchlist = &c; | |
1310 | h.handler = handlers; | |
1311 | h.var = Qnil; | |
1312 | h.next = handlerlist; | |
1313 | h.tag = &c; | |
1314 | handlerlist = &h; | |
1315 | ||
1316 | val = (*bfun) (nargs, args); | |
1317 | catchlist = c.next; | |
1318 | handlerlist = h.next; | |
1319 | return val; | |
1320 | } | |
1321 | ||
d227775c | 1322 | \f |
7d47b580 | 1323 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object); |
1882aa38 PE |
1324 | static bool maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1325 | Lisp_Object data); | |
db9f0278 | 1326 | |
6d5eb5b0 SM |
1327 | void |
1328 | process_quit_flag (void) | |
1329 | { | |
1330 | Lisp_Object flag = Vquit_flag; | |
1331 | Vquit_flag = Qnil; | |
1332 | if (EQ (flag, Qkill_emacs)) | |
1333 | Fkill_emacs (Qnil); | |
1334 | if (EQ (Vthrow_on_input, flag)) | |
1335 | Fthrow (Vthrow_on_input, Qt); | |
1336 | Fsignal (Qquit, Qnil); | |
1337 | } | |
1338 | ||
a7ca3326 | 1339 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, |
9dbc9081 PJ |
1340 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1341 | This function does not return. | |
1342 | ||
1343 | An error symbol is a symbol with an `error-conditions' property | |
1344 | that is a list of condition names. | |
1345 | A handler for any of those names will get to handle this signal. | |
1346 | The symbol `error' should normally be one of them. | |
1347 | ||
1348 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1349 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1350 | error message is constructed. | |
9dbc9081 PJ |
1351 | If the signal is handled, DATA is made available to the handler. |
1352 | See also the function `condition-case'. */) | |
5842a27b | 1353 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1354 | { |
bfa8ca43 | 1355 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1356 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1357 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1358 | Lisp_Object conditions; |
c11d3d17 | 1359 | Lisp_Object string; |
e7f7fbaa SM |
1360 | Lisp_Object real_error_symbol |
1361 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1362 | register Lisp_Object clause = Qnil; | |
1363 | struct handler *h; | |
a2ff3819 | 1364 | struct backtrace *bp; |
db9f0278 | 1365 | |
0caaedb1 | 1366 | immediate_quit = 0; |
d063129f | 1367 | abort_on_gc = 0; |
db9f0278 | 1368 | if (gc_in_progress || waiting_for_input) |
1088b922 | 1369 | emacs_abort (); |
db9f0278 | 1370 | |
26631f2b RS |
1371 | #if 0 /* rms: I don't know why this was here, |
1372 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1373 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1374 | if (display_hourglass_p) |
1375 | cancel_hourglass (); | |
48f8dfa3 | 1376 | #endif |
177c0ea7 | 1377 | #endif |
48f8dfa3 | 1378 | |
61ede770 | 1379 | /* This hook is used by edebug. */ |
26631f2b RS |
1380 | if (! NILP (Vsignal_hook_function) |
1381 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1382 | { |
1383 | /* Edebug takes care of restoring these variables when it exits. */ | |
1384 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1385 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1386 | ||
1387 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1388 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1389 | ||
1390 | call2 (Vsignal_hook_function, error_symbol, data); | |
1391 | } | |
61ede770 | 1392 | |
1ea9dec4 | 1393 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1394 | |
a2ff3819 GM |
1395 | /* Remember from where signal was called. Skip over the frame for |
1396 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1397 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1398 | is a memory-full error. */ | |
090a072f | 1399 | Vsignaling_function = Qnil; |
26631f2b | 1400 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1401 | { |
1402 | bp = backtrace_list->next; | |
e7c1b6ef | 1403 | if (bp && EQ (bp->function, Qerror)) |
090a072f | 1404 | bp = bp->next; |
e7c1b6ef SM |
1405 | if (bp) |
1406 | Vsignaling_function = bp->function; | |
090a072f | 1407 | } |
a2ff3819 | 1408 | |
e7f7fbaa | 1409 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1410 | { |
7d47b580 | 1411 | clause = find_handler_clause (h->handler, conditions); |
265a9e55 | 1412 | if (!NILP (clause)) |
e7f7fbaa | 1413 | break; |
db9f0278 | 1414 | } |
475545b5 | 1415 | |
e7f7fbaa | 1416 | if (/* Don't run the debugger for a memory-full error. |
e7c1b6ef | 1417 | (There is no room in memory to do that!) */ |
e7f7fbaa SM |
1418 | !NILP (error_symbol) |
1419 | && (!NILP (Vdebug_on_signal) | |
1420 | /* If no handler is present now, try to run the debugger. */ | |
1421 | || NILP (clause) | |
bd1ba3e8 CY |
1422 | /* A `debug' symbol in the handler list disables the normal |
1423 | suppression of the debugger. */ | |
1424 | || (CONSP (clause) && CONSP (XCAR (clause)) | |
1425 | && !NILP (Fmemq (Qdebug, XCAR (clause)))) | |
e7f7fbaa SM |
1426 | /* Special handler that means "print a message and run debugger |
1427 | if requested". */ | |
1428 | || EQ (h->handler, Qerror))) | |
1429 | { | |
1882aa38 | 1430 | bool debugger_called |
e7f7fbaa SM |
1431 | = maybe_call_debugger (conditions, error_symbol, data); |
1432 | /* We can't return values to code which signaled an error, but we | |
1433 | can continue code which has signaled a quit. */ | |
1434 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
1435 | return Qnil; | |
475545b5 | 1436 | } |
db9f0278 | 1437 | |
e7f7fbaa SM |
1438 | if (!NILP (clause)) |
1439 | { | |
1440 | Lisp_Object unwind_data | |
1441 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 1442 | |
e7f7fbaa SM |
1443 | h->chosen_clause = clause; |
1444 | unwind_to_catch (h->tag, unwind_data); | |
1445 | } | |
1446 | else | |
1447 | { | |
1448 | if (catchlist != 0) | |
1449 | Fthrow (Qtop_level, Qt); | |
1450 | } | |
c11d3d17 | 1451 | |
1ea9dec4 | 1452 | if (! NILP (error_symbol)) |
c11d3d17 | 1453 | data = Fcons (error_symbol, data); |
475545b5 | 1454 | |
c11d3d17 | 1455 | string = Ferror_message_string (data); |
583f48b9 | 1456 | fatal ("%s", SDATA (string)); |
db9f0278 JB |
1457 | } |
1458 | ||
734d55a2 KS |
1459 | /* Internal version of Fsignal that never returns. |
1460 | Used for anything but Qquit (which can return from Fsignal). */ | |
1461 | ||
1462 | void | |
d3da34e0 | 1463 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1464 | { |
1465 | Fsignal (error_symbol, data); | |
1088b922 | 1466 | emacs_abort (); |
734d55a2 KS |
1467 | } |
1468 | ||
1469 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1470 | ||
1471 | void | |
d3da34e0 | 1472 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1473 | { |
1474 | xsignal (error_symbol, Qnil); | |
1475 | } | |
1476 | ||
1477 | void | |
d3da34e0 | 1478 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1479 | { |
1480 | xsignal (error_symbol, list1 (arg)); | |
1481 | } | |
1482 | ||
1483 | void | |
d3da34e0 | 1484 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1485 | { |
1486 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1487 | } | |
1488 | ||
1489 | void | |
d3da34e0 | 1490 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1491 | { |
1492 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1493 | } | |
1494 | ||
1495 | /* Signal `error' with message S, and additional arg ARG. | |
1496 | If ARG is not a genuine list, make it a one-element list. */ | |
1497 | ||
1498 | void | |
a8fe7202 | 1499 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1500 | { |
1501 | Lisp_Object tortoise, hare; | |
1502 | ||
1503 | hare = tortoise = arg; | |
1504 | while (CONSP (hare)) | |
1505 | { | |
1506 | hare = XCDR (hare); | |
1507 | if (!CONSP (hare)) | |
1508 | break; | |
1509 | ||
1510 | hare = XCDR (hare); | |
1511 | tortoise = XCDR (tortoise); | |
1512 | ||
1513 | if (EQ (hare, tortoise)) | |
1514 | break; | |
1515 | } | |
1516 | ||
1517 | if (!NILP (hare)) | |
1518 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1519 | ||
1520 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1521 | } | |
1522 | ||
1523 | ||
1882aa38 | 1524 | /* Return true if LIST is a non-nil atom or |
128c0f66 RM |
1525 | a list containing one of CONDITIONS. */ |
1526 | ||
1882aa38 | 1527 | static bool |
d3da34e0 | 1528 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1529 | { |
4de86b16 | 1530 | if (NILP (list)) |
128c0f66 RM |
1531 | return 0; |
1532 | if (! CONSP (list)) | |
1533 | return 1; | |
1534 | ||
ab67260b | 1535 | while (CONSP (conditions)) |
128c0f66 | 1536 | { |
ab67260b | 1537 | Lisp_Object this, tail; |
03699b14 KR |
1538 | this = XCAR (conditions); |
1539 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1540 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1541 | return 1; |
03699b14 | 1542 | conditions = XCDR (conditions); |
128c0f66 | 1543 | } |
ab67260b | 1544 | return 0; |
128c0f66 RM |
1545 | } |
1546 | ||
1882aa38 | 1547 | /* Return true if an error with condition-symbols CONDITIONS, |
fc950e09 | 1548 | and described by SIGNAL-DATA, should skip the debugger |
1b1acc13 | 1549 | according to debugger-ignored-errors. */ |
fc950e09 | 1550 | |
1882aa38 | 1551 | static bool |
d3da34e0 | 1552 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1553 | { |
1554 | Lisp_Object tail; | |
1882aa38 | 1555 | bool first_string = 1; |
fc950e09 KH |
1556 | Lisp_Object error_message; |
1557 | ||
17401c97 GM |
1558 | error_message = Qnil; |
1559 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1560 | { |
03699b14 | 1561 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1562 | { |
1563 | if (first_string) | |
1564 | { | |
1565 | error_message = Ferror_message_string (data); | |
1566 | first_string = 0; | |
1567 | } | |
177c0ea7 | 1568 | |
03699b14 | 1569 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1570 | return 1; |
1571 | } | |
1572 | else | |
1573 | { | |
1574 | Lisp_Object contail; | |
1575 | ||
17401c97 | 1576 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1577 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1578 | return 1; |
1579 | } | |
1580 | } | |
1581 | ||
1582 | return 0; | |
1583 | } | |
1584 | ||
ddaa36e1 | 1585 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
7d47b580 JB |
1586 | SIG and DATA describe the signal. There are two ways to pass them: |
1587 | = SIG is the error symbol, and DATA is the rest of the data. | |
1588 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). | |
1589 | This is for memory-full errors only. */ | |
1882aa38 | 1590 | static bool |
d3da34e0 | 1591 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1592 | { |
1593 | Lisp_Object combined_data; | |
1594 | ||
1595 | combined_data = Fcons (sig, data); | |
1596 | ||
1597 | if ( | |
1598 | /* Don't try to run the debugger with interrupts blocked. | |
1599 | The editing loop would return anyway. */ | |
4d7e6e51 | 1600 | ! input_blocked_p () |
45b82ad0 | 1601 | && NILP (Vinhibit_debugger) |
ddaa36e1 AS |
1602 | /* Does user want to enter debugger for this kind of error? */ |
1603 | && (EQ (sig, Qquit) | |
1604 | ? debug_on_quit | |
1605 | : wants_debugger (Vdebug_on_error, conditions)) | |
1606 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1607 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1608 | && when_entered_debugger < num_nonmacro_input_events) |
1609 | { | |
1610 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1611 | return 1; | |
1612 | } | |
1613 | ||
1614 | return 0; | |
1615 | } | |
1616 | ||
db9f0278 | 1617 | static Lisp_Object |
7d47b580 | 1618 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions) |
db9f0278 JB |
1619 | { |
1620 | register Lisp_Object h; | |
db9f0278 | 1621 | |
f01cbfdd RS |
1622 | /* t is used by handlers for all conditions, set up by C code. */ |
1623 | if (EQ (handlers, Qt)) | |
db9f0278 | 1624 | return Qt; |
f01cbfdd | 1625 | |
61ede770 RS |
1626 | /* error is used similarly, but means print an error message |
1627 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1628 | if (EQ (handlers, Qerror)) |
1629 | return Qt; | |
f01cbfdd | 1630 | |
e7f7fbaa | 1631 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1632 | { |
e7f7fbaa SM |
1633 | Lisp_Object handler = XCAR (h); |
1634 | Lisp_Object condit, tem; | |
5f96776a | 1635 | |
5f96776a | 1636 | if (!CONSP (handler)) |
db9f0278 | 1637 | continue; |
e7f7fbaa | 1638 | condit = XCAR (handler); |
5f96776a RS |
1639 | /* Handle a single condition name in handler HANDLER. */ |
1640 | if (SYMBOLP (condit)) | |
1641 | { | |
1642 | tem = Fmemq (Fcar (handler), conditions); | |
1643 | if (!NILP (tem)) | |
1644 | return handler; | |
1645 | } | |
1646 | /* Handle a list of condition names in handler HANDLER. */ | |
1647 | else if (CONSP (condit)) | |
1648 | { | |
f01cbfdd RS |
1649 | Lisp_Object tail; |
1650 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1651 | { |
e7f7fbaa | 1652 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1653 | if (!NILP (tem)) |
e7f7fbaa | 1654 | return handler; |
5f96776a RS |
1655 | } |
1656 | } | |
db9f0278 | 1657 | } |
f01cbfdd | 1658 | |
db9f0278 JB |
1659 | return Qnil; |
1660 | } | |
1661 | ||
db9f0278 | 1662 | |
f6d62986 | 1663 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1664 | void |
b3ffc17c | 1665 | verror (const char *m, va_list ap) |
db9f0278 | 1666 | { |
70476b54 | 1667 | char buf[4000]; |
c2d1e36d PE |
1668 | ptrdiff_t size = sizeof buf; |
1669 | ptrdiff_t size_max = STRING_BYTES_BOUND + 1; | |
9125da08 | 1670 | char *buffer = buf; |
c2d1e36d | 1671 | ptrdiff_t used; |
9125da08 RS |
1672 | Lisp_Object string; |
1673 | ||
d749b01b | 1674 | used = evxprintf (&buffer, &size, buf, size_max, m, ap); |
5fdb398c | 1675 | string = make_string (buffer, used); |
eb3f1cc8 | 1676 | if (buffer != buf) |
9ae6734f | 1677 | xfree (buffer); |
9125da08 | 1678 | |
734d55a2 | 1679 | xsignal1 (Qerror, string); |
db9f0278 | 1680 | } |
b3ffc17c DN |
1681 | |
1682 | ||
f6d62986 | 1683 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
1684 | |
1685 | /* VARARGS 1 */ | |
1686 | void | |
1687 | error (const char *m, ...) | |
1688 | { | |
1689 | va_list ap; | |
1690 | va_start (ap, m); | |
1691 | verror (m, ap); | |
1692 | va_end (ap); | |
1693 | } | |
db9f0278 | 1694 | \f |
a7ca3326 | 1695 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
1696 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
1697 | This means it contains a description for how to read arguments to give it. | |
1698 | The value is nil for an invalid function or a symbol with no function | |
1699 | definition. | |
1700 | ||
1701 | Interactively callable functions include strings and vectors (treated | |
1702 | as keyboard macros), lambda-expressions that contain a top-level call | |
1703 | to `interactive', autoload definitions made by `autoload' with non-nil | |
1704 | fourth argument, and some of the built-in functions of Lisp. | |
1705 | ||
e72706be RS |
1706 | Also, a symbol satisfies `commandp' if its function definition does so. |
1707 | ||
1708 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 1709 | then strings and vectors are not accepted. */) |
5842a27b | 1710 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
1711 | { |
1712 | register Lisp_Object fun; | |
1713 | register Lisp_Object funcar; | |
52b71f49 | 1714 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
1715 | |
1716 | fun = function; | |
1717 | ||
eadf1faa SM |
1718 | fun = indirect_function (fun); /* Check cycles. */ |
1719 | if (NILP (fun)) | |
ffd56f97 | 1720 | return Qnil; |
db9f0278 | 1721 | |
52b71f49 | 1722 | /* Check an `interactive-form' property if present, analogous to the |
eadf1faa | 1723 | function-documentation property. */ |
52b71f49 SM |
1724 | fun = function; |
1725 | while (SYMBOLP (fun)) | |
1726 | { | |
2b9aa051 | 1727 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
1728 | if (!NILP (tmp)) |
1729 | if_prop = Qt; | |
1730 | fun = Fsymbol_function (fun); | |
1731 | } | |
1732 | ||
db9f0278 JB |
1733 | /* Emacs primitives are interactive if their DEFUN specifies an |
1734 | interactive spec. */ | |
90165123 | 1735 | if (SUBRP (fun)) |
04724b69 | 1736 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
1737 | |
1738 | /* Bytecode objects are interactive if they are long enough to | |
1739 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1740 | where the interactive spec is stored. */ | |
90165123 | 1741 | else if (COMPILEDP (fun)) |
845975f5 | 1742 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 1743 | ? Qt : if_prop); |
db9f0278 JB |
1744 | |
1745 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 1746 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 1747 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
1748 | |
1749 | /* Lists may represent commands. */ | |
1750 | if (!CONSP (fun)) | |
1751 | return Qnil; | |
ed16fb98 | 1752 | funcar = XCAR (fun); |
b38b1ec0 | 1753 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
1754 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
1755 | ? Qt : if_prop); | |
23aba0ea | 1756 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 1757 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 1758 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 1759 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
1760 | else |
1761 | return Qnil; | |
1762 | } | |
1763 | ||
db9f0278 | 1764 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
1765 | doc: /* Define FUNCTION to autoload from FILE. |
1766 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
1767 | Third arg DOCSTRING is documentation for the function. | |
1768 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
1769 | Fifth arg TYPE indicates the type of the object: | |
1770 | nil or omitted says FUNCTION is a function, | |
1771 | `keymap' says FUNCTION is really a keymap, and | |
1772 | `macro' or t says FUNCTION is really a macro. | |
1773 | Third through fifth args give info about the real definition. | |
1774 | They default to nil. | |
1775 | If FUNCTION is already defined other than as an autoload, | |
1776 | this does nothing and returns nil. */) | |
5842a27b | 1777 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 1778 | { |
b7826503 PJ |
1779 | CHECK_SYMBOL (function); |
1780 | CHECK_STRING (file); | |
db9f0278 | 1781 | |
f6d62986 | 1782 | /* If function is defined and not as an autoload, don't override. */ |
eadf1faa | 1783 | if (!NILP (XSYMBOL (function)->function) |
32e5c58c | 1784 | && !AUTOLOADP (XSYMBOL (function)->function)) |
db9f0278 JB |
1785 | return Qnil; |
1786 | ||
32e5c58c | 1787 | if (!NILP (Vpurify_flag) && EQ (docstring, make_number (0))) |
61b108cc SM |
1788 | /* `read1' in lread.c has found the docstring starting with "\ |
1789 | and assumed the docstring will be provided by Snarf-documentation, so it | |
1790 | passed us 0 instead. But that leads to accidental sharing in purecopy's | |
1791 | hash-consing, so we use a (hopefully) unique integer instead. */ | |
32e5c58c SM |
1792 | docstring = make_number (XHASH (function)); |
1793 | return Fdefalias (function, | |
1794 | list5 (Qautoload, file, docstring, interactive, type), | |
1795 | Qnil); | |
db9f0278 JB |
1796 | } |
1797 | ||
1798 | Lisp_Object | |
d3da34e0 | 1799 | un_autoload (Lisp_Object oldqueue) |
db9f0278 JB |
1800 | { |
1801 | register Lisp_Object queue, first, second; | |
1802 | ||
1803 | /* Queue to unwind is current value of Vautoload_queue. | |
1804 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1805 | queue = Vautoload_queue; | |
1806 | Vautoload_queue = oldqueue; | |
1807 | while (CONSP (queue)) | |
1808 | { | |
e509f168 | 1809 | first = XCAR (queue); |
db9f0278 JB |
1810 | second = Fcdr (first); |
1811 | first = Fcar (first); | |
47b82df9 RS |
1812 | if (EQ (first, make_number (0))) |
1813 | Vfeatures = second; | |
db9f0278 JB |
1814 | else |
1815 | Ffset (first, second); | |
e509f168 | 1816 | queue = XCDR (queue); |
db9f0278 JB |
1817 | } |
1818 | return Qnil; | |
1819 | } | |
1820 | ||
ca20916b RS |
1821 | /* Load an autoloaded function. |
1822 | FUNNAME is the symbol which is the function's name. | |
1823 | FUNDEF is the autoload definition (a list). */ | |
1824 | ||
7abaf5cc SM |
1825 | DEFUN ("autoload-do-load", Fautoload_do_load, Sautoload_do_load, 1, 3, 0, |
1826 | doc: /* Load FUNDEF which should be an autoload. | |
1827 | If non-nil, FUNNAME should be the symbol whose function value is FUNDEF, | |
1828 | in which case the function returns the new autoloaded function value. | |
1829 | If equal to `macro', MACRO-ONLY specifies that FUNDEF should only be loaded if | |
1830 | it is defines a macro. */) | |
1831 | (Lisp_Object fundef, Lisp_Object funname, Lisp_Object macro_only) | |
db9f0278 | 1832 | { |
d311d28c | 1833 | ptrdiff_t count = SPECPDL_INDEX (); |
ca20916b | 1834 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 1835 | |
7abaf5cc SM |
1836 | if (!CONSP (fundef) || !EQ (Qautoload, XCAR (fundef))) |
1837 | return fundef; | |
1838 | ||
1839 | if (EQ (macro_only, Qmacro)) | |
1840 | { | |
1841 | Lisp_Object kind = Fnth (make_number (4), fundef); | |
1842 | if (! (EQ (kind, Qt) || EQ (kind, Qmacro))) | |
1843 | return fundef; | |
1844 | } | |
1845 | ||
aea6173f RS |
1846 | /* This is to make sure that loadup.el gives a clear picture |
1847 | of what files are preloaded and when. */ | |
ab4db096 RS |
1848 | if (! NILP (Vpurify_flag)) |
1849 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 1850 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 1851 | |
b7826503 | 1852 | CHECK_SYMBOL (funname); |
7abaf5cc | 1853 | GCPRO3 (funname, fundef, macro_only); |
db9f0278 | 1854 | |
f87740dc | 1855 | /* Preserve the match data. */ |
89f2614d | 1856 | record_unwind_save_match_data (); |
177c0ea7 | 1857 | |
a04ee161 RS |
1858 | /* If autoloading gets an error (which includes the error of failing |
1859 | to define the function being called), we use Vautoload_queue | |
1860 | to undo function definitions and `provide' calls made by | |
1861 | the function. We do this in the specific case of autoloading | |
1862 | because autoloading is not an explicit request "load this file", | |
1863 | but rather a request to "call this function". | |
d3da34e0 | 1864 | |
a04ee161 | 1865 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
1866 | record_unwind_protect (un_autoload, Vautoload_queue); |
1867 | Vautoload_queue = Qt; | |
7abaf5cc SM |
1868 | /* If `macro_only', assume this autoload to be a "best-effort", |
1869 | so don't signal an error if autoloading fails. */ | |
1870 | Fload (Fcar (Fcdr (fundef)), macro_only, Qt, Qnil, Qt); | |
2a49b6e5 | 1871 | |
db9f0278 JB |
1872 | /* Once loading finishes, don't undo it. */ |
1873 | Vautoload_queue = Qt; | |
1874 | unbind_to (count, Qnil); | |
1875 | ||
ca20916b | 1876 | UNGCPRO; |
7abaf5cc SM |
1877 | |
1878 | if (NILP (funname)) | |
1879 | return Qnil; | |
1880 | else | |
1881 | { | |
1882 | Lisp_Object fun = Findirect_function (funname, Qnil); | |
1883 | ||
1884 | if (!NILP (Fequal (fun, fundef))) | |
1885 | error ("Autoloading failed to define function %s", | |
1886 | SDATA (SYMBOL_NAME (funname))); | |
1887 | else | |
1888 | return fun; | |
1889 | } | |
db9f0278 | 1890 | } |
4c576a83 | 1891 | |
db9f0278 | 1892 | \f |
a7ca3326 | 1893 | DEFUN ("eval", Feval, Seval, 1, 2, 0, |
a0ee6f27 SM |
1894 | doc: /* Evaluate FORM and return its value. |
1895 | If LEXICAL is t, evaluate using lexical scoping. */) | |
1896 | (Lisp_Object form, Lisp_Object lexical) | |
defb1411 | 1897 | { |
d311d28c | 1898 | ptrdiff_t count = SPECPDL_INDEX (); |
a0ee6f27 SM |
1899 | specbind (Qinternal_interpreter_environment, |
1900 | NILP (lexical) ? Qnil : Fcons (Qt, Qnil)); | |
defb1411 SM |
1901 | return unbind_to (count, eval_sub (form)); |
1902 | } | |
1903 | ||
1904 | /* Eval a sub-expression of the current expression (i.e. in the same | |
1905 | lexical scope). */ | |
1906 | Lisp_Object | |
1907 | eval_sub (Lisp_Object form) | |
db9f0278 JB |
1908 | { |
1909 | Lisp_Object fun, val, original_fun, original_args; | |
1910 | Lisp_Object funcar; | |
1911 | struct backtrace backtrace; | |
1912 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1913 | ||
90165123 | 1914 | if (SYMBOLP (form)) |
b9598260 | 1915 | { |
f07a954e SM |
1916 | /* Look up its binding in the lexical environment. |
1917 | We do not pay attention to the declared_special flag here, since we | |
1918 | already did that when let-binding the variable. */ | |
1919 | Lisp_Object lex_binding | |
1920 | = !NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
1921 | ? Fassq (form, Vinternal_interpreter_environment) | |
1922 | : Qnil; | |
1923 | if (CONSP (lex_binding)) | |
1924 | return XCDR (lex_binding); | |
1925 | else | |
1926 | return Fsymbol_value (form); | |
b9598260 SM |
1927 | } |
1928 | ||
db9f0278 JB |
1929 | if (!CONSP (form)) |
1930 | return form; | |
1931 | ||
1932 | QUIT; | |
765e61e3 | 1933 | maybe_gc (); |
db9f0278 JB |
1934 | |
1935 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1936 | { | |
1937 | if (max_lisp_eval_depth < 100) | |
1938 | max_lisp_eval_depth = 100; | |
1939 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 1940 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
1941 | } |
1942 | ||
7d7bbefd DA |
1943 | original_fun = XCAR (form); |
1944 | original_args = XCDR (form); | |
db9f0278 JB |
1945 | |
1946 | backtrace.next = backtrace_list; | |
e7c1b6ef | 1947 | backtrace.function = original_fun; /* This also protects them from gc. */ |
db9f0278 JB |
1948 | backtrace.args = &original_args; |
1949 | backtrace.nargs = UNEVALLED; | |
db9f0278 | 1950 | backtrace.debug_on_exit = 0; |
c2d7786e | 1951 | backtrace_list = &backtrace; |
db9f0278 JB |
1952 | |
1953 | if (debug_on_next_call) | |
1954 | do_debug_on_call (Qt); | |
1955 | ||
1956 | /* At this point, only original_fun and original_args | |
f6d62986 | 1957 | have values that will be used below. */ |
db9f0278 | 1958 | retry: |
8788120f KS |
1959 | |
1960 | /* Optimize for no indirection. */ | |
1961 | fun = original_fun; | |
eadf1faa | 1962 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 1963 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 1964 | fun = indirect_function (fun); |
db9f0278 | 1965 | |
90165123 | 1966 | if (SUBRP (fun)) |
db9f0278 JB |
1967 | { |
1968 | Lisp_Object numargs; | |
166c822d | 1969 | Lisp_Object argvals[8]; |
db9f0278 JB |
1970 | Lisp_Object args_left; |
1971 | register int i, maxargs; | |
1972 | ||
1973 | args_left = original_args; | |
1974 | numargs = Flength (args_left); | |
1975 | ||
7e63e0c3 | 1976 | check_cons_list (); |
c1788fbc | 1977 | |
f6d62986 SM |
1978 | if (XINT (numargs) < XSUBR (fun)->min_args |
1979 | || (XSUBR (fun)->max_args >= 0 | |
1980 | && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 1981 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 1982 | |
ef1b0ba7 | 1983 | else if (XSUBR (fun)->max_args == UNEVALLED) |
bbc6b304 | 1984 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
ef1b0ba7 | 1985 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 | 1986 | { |
f6d62986 | 1987 | /* Pass a vector of evaluated arguments. */ |
db9f0278 | 1988 | Lisp_Object *vals; |
f66c7cf8 | 1989 | ptrdiff_t argnum = 0; |
3a7a9129 | 1990 | USE_SAFE_ALLOCA; |
db9f0278 | 1991 | |
b72e0717 | 1992 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
1993 | |
1994 | GCPRO3 (args_left, fun, fun); | |
1995 | gcpro3.var = vals; | |
1996 | gcpro3.nvars = 0; | |
1997 | ||
265a9e55 | 1998 | while (!NILP (args_left)) |
db9f0278 | 1999 | { |
defb1411 | 2000 | vals[argnum++] = eval_sub (Fcar (args_left)); |
db9f0278 JB |
2001 | args_left = Fcdr (args_left); |
2002 | gcpro3.nvars = argnum; | |
2003 | } | |
db9f0278 JB |
2004 | |
2005 | backtrace.args = vals; | |
2006 | backtrace.nargs = XINT (numargs); | |
2007 | ||
d5273788 | 2008 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2009 | UNGCPRO; |
3a7a9129 | 2010 | SAFE_FREE (); |
db9f0278 | 2011 | } |
ef1b0ba7 | 2012 | else |
db9f0278 | 2013 | { |
ef1b0ba7 SM |
2014 | GCPRO3 (args_left, fun, fun); |
2015 | gcpro3.var = argvals; | |
2016 | gcpro3.nvars = 0; | |
db9f0278 | 2017 | |
ef1b0ba7 SM |
2018 | maxargs = XSUBR (fun)->max_args; |
2019 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2020 | { | |
a0ee6f27 | 2021 | argvals[i] = eval_sub (Fcar (args_left)); |
ef1b0ba7 SM |
2022 | gcpro3.nvars = ++i; |
2023 | } | |
db9f0278 | 2024 | |
ef1b0ba7 | 2025 | UNGCPRO; |
db9f0278 | 2026 | |
ef1b0ba7 SM |
2027 | backtrace.args = argvals; |
2028 | backtrace.nargs = XINT (numargs); | |
2029 | ||
2030 | switch (i) | |
2031 | { | |
2032 | case 0: | |
2033 | val = (XSUBR (fun)->function.a0 ()); | |
2034 | break; | |
2035 | case 1: | |
2036 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2037 | break; | |
2038 | case 2: | |
2039 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2040 | break; | |
2041 | case 3: | |
2042 | val = (XSUBR (fun)->function.a3 | |
2043 | (argvals[0], argvals[1], argvals[2])); | |
2044 | break; | |
2045 | case 4: | |
2046 | val = (XSUBR (fun)->function.a4 | |
2047 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2048 | break; | |
2049 | case 5: | |
2050 | val = (XSUBR (fun)->function.a5 | |
2051 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2052 | argvals[4])); | |
2053 | break; | |
2054 | case 6: | |
2055 | val = (XSUBR (fun)->function.a6 | |
2056 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2057 | argvals[4], argvals[5])); | |
2058 | break; | |
2059 | case 7: | |
2060 | val = (XSUBR (fun)->function.a7 | |
2061 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2062 | argvals[4], argvals[5], argvals[6])); | |
2063 | break; | |
2064 | ||
2065 | case 8: | |
2066 | val = (XSUBR (fun)->function.a8 | |
2067 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2068 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2069 | break; | |
2070 | ||
2071 | default: | |
2072 | /* Someone has created a subr that takes more arguments than | |
2073 | is supported by this code. We need to either rewrite the | |
2074 | subr to use a different argument protocol, or add more | |
2075 | cases to this switch. */ | |
1088b922 | 2076 | emacs_abort (); |
ef1b0ba7 | 2077 | } |
db9f0278 JB |
2078 | } |
2079 | } | |
ef1b0ba7 | 2080 | else if (COMPILEDP (fun)) |
defb1411 | 2081 | val = apply_lambda (fun, original_args); |
db9f0278 JB |
2082 | else |
2083 | { | |
eadf1faa | 2084 | if (NILP (fun)) |
734d55a2 | 2085 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2086 | if (!CONSP (fun)) |
734d55a2 KS |
2087 | xsignal1 (Qinvalid_function, original_fun); |
2088 | funcar = XCAR (fun); | |
90165123 | 2089 | if (!SYMBOLP (funcar)) |
734d55a2 | 2090 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2091 | if (EQ (funcar, Qautoload)) |
2092 | { | |
7abaf5cc | 2093 | Fautoload_do_load (fun, original_fun, Qnil); |
db9f0278 JB |
2094 | goto retry; |
2095 | } | |
2096 | if (EQ (funcar, Qmacro)) | |
8be3a09c SM |
2097 | { |
2098 | ptrdiff_t count = SPECPDL_INDEX (); | |
8be3a09c SM |
2099 | Lisp_Object exp; |
2100 | /* Bind lexical-binding during expansion of the macro, so the | |
2101 | macro can know reliably if the code it outputs will be | |
2102 | interpreted using lexical-binding or not. */ | |
2103 | specbind (Qlexical_binding, | |
2104 | NILP (Vinternal_interpreter_environment) ? Qnil : Qt); | |
2105 | exp = apply1 (Fcdr (fun), original_args); | |
2106 | unbind_to (count, Qnil); | |
2107 | val = eval_sub (exp); | |
2108 | } | |
defb1411 SM |
2109 | else if (EQ (funcar, Qlambda) |
2110 | || EQ (funcar, Qclosure)) | |
2111 | val = apply_lambda (fun, original_args); | |
db9f0278 | 2112 | else |
734d55a2 | 2113 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2114 | } |
7e63e0c3 | 2115 | check_cons_list (); |
c1788fbc | 2116 | |
db9f0278 JB |
2117 | lisp_eval_depth--; |
2118 | if (backtrace.debug_on_exit) | |
2119 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2120 | backtrace_list = backtrace.next; | |
824eb35e | 2121 | |
db9f0278 JB |
2122 | return val; |
2123 | } | |
2124 | \f | |
8edd4a2b | 2125 | DEFUN ("apply", Fapply, Sapply, 1, MANY, 0, |
9dbc9081 PJ |
2126 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2127 | Then return the value FUNCTION returns. | |
2128 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2129 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2130 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2131 | { |
d311d28c PE |
2132 | ptrdiff_t i; |
2133 | EMACS_INT numargs; | |
db9f0278 JB |
2134 | register Lisp_Object spread_arg; |
2135 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2136 | Lisp_Object fun, retval; |
96d44c64 | 2137 | struct gcpro gcpro1; |
3a7a9129 | 2138 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2139 | |
2140 | fun = args [0]; | |
2141 | funcall_args = 0; | |
2142 | spread_arg = args [nargs - 1]; | |
b7826503 | 2143 | CHECK_LIST (spread_arg); |
177c0ea7 | 2144 | |
db9f0278 JB |
2145 | numargs = XINT (Flength (spread_arg)); |
2146 | ||
2147 | if (numargs == 0) | |
2148 | return Ffuncall (nargs - 1, args); | |
2149 | else if (numargs == 1) | |
2150 | { | |
03699b14 | 2151 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2152 | return Ffuncall (nargs, args); |
2153 | } | |
2154 | ||
a6e3fa71 | 2155 | numargs += nargs - 2; |
db9f0278 | 2156 | |
8788120f | 2157 | /* Optimize for no indirection. */ |
eadf1faa | 2158 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2159 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2160 | fun = indirect_function (fun); |
eadf1faa | 2161 | if (NILP (fun)) |
db9f0278 | 2162 | { |
f6d62986 | 2163 | /* Let funcall get the error. */ |
ffd56f97 JB |
2164 | fun = args[0]; |
2165 | goto funcall; | |
db9f0278 JB |
2166 | } |
2167 | ||
90165123 | 2168 | if (SUBRP (fun)) |
db9f0278 JB |
2169 | { |
2170 | if (numargs < XSUBR (fun)->min_args | |
2171 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
f6d62986 | 2172 | goto funcall; /* Let funcall get the error. */ |
c5101a77 | 2173 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2174 | { |
2175 | /* Avoid making funcall cons up a yet another new vector of arguments | |
f6d62986 | 2176 | by explicitly supplying nil's for optional values. */ |
b72e0717 | 2177 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2178 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2179 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2180 | GCPRO1 (*funcall_args); |
2181 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2182 | } |
2183 | } | |
2184 | funcall: | |
2185 | /* We add 1 to numargs because funcall_args includes the | |
2186 | function itself as well as its arguments. */ | |
2187 | if (!funcall_args) | |
a6e3fa71 | 2188 | { |
b72e0717 | 2189 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2190 | GCPRO1 (*funcall_args); |
2191 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2192 | } |
2193 | ||
663e2b3f | 2194 | memcpy (funcall_args, args, nargs * word_size); |
db9f0278 JB |
2195 | /* Spread the last arg we got. Its first element goes in |
2196 | the slot that it used to occupy, hence this value of I. */ | |
2197 | i = nargs - 1; | |
265a9e55 | 2198 | while (!NILP (spread_arg)) |
db9f0278 | 2199 | { |
03699b14 KR |
2200 | funcall_args [i++] = XCAR (spread_arg); |
2201 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2202 | } |
a6e3fa71 | 2203 | |
96d44c64 | 2204 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2205 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2206 | UNGCPRO; | |
2207 | SAFE_FREE (); | |
2208 | ||
2209 | return retval; | |
db9f0278 JB |
2210 | } |
2211 | \f | |
ff936e53 SM |
2212 | /* Run hook variables in various ways. */ |
2213 | ||
f6d62986 | 2214 | static Lisp_Object |
f66c7cf8 | 2215 | funcall_nil (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2216 | { |
2217 | Ffuncall (nargs, args); | |
2218 | return Qnil; | |
2219 | } | |
ff936e53 | 2220 | |
a7ca3326 | 2221 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2222 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2223 | Each argument should be a symbol, a hook variable. |
2224 | These symbols are processed in the order specified. | |
2225 | If a hook symbol has a non-nil value, that value may be a function | |
2226 | or a list of functions to be called to run the hook. | |
2227 | If the value is a function, it is called with no arguments. | |
2228 | If it is a list, the elements are called, in order, with no arguments. | |
2229 | ||
9f685258 LK |
2230 | Major modes should not use this function directly to run their mode |
2231 | hook; they should use `run-mode-hooks' instead. | |
2232 | ||
72e85d5d RS |
2233 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2234 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2235 | usage: (run-hooks &rest HOOKS) */) |
f66c7cf8 | 2236 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 SM |
2237 | { |
2238 | Lisp_Object hook[1]; | |
f66c7cf8 | 2239 | ptrdiff_t i; |
ff936e53 SM |
2240 | |
2241 | for (i = 0; i < nargs; i++) | |
2242 | { | |
2243 | hook[0] = args[i]; | |
f6d62986 | 2244 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
2245 | } |
2246 | ||
2247 | return Qnil; | |
2248 | } | |
177c0ea7 | 2249 | |
a7ca3326 | 2250 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2251 | Srun_hook_with_args, 1, MANY, 0, |
2252 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2253 | HOOK should be a symbol, a hook variable. The value of HOOK |
2254 | may be nil, a function, or a list of functions. Call each | |
2255 | function in order with arguments ARGS. The final return value | |
2256 | is unspecified. | |
9dbc9081 | 2257 | |
72e85d5d RS |
2258 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2259 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2260 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
f66c7cf8 | 2261 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2262 | { |
f6d62986 | 2263 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
2264 | } |
2265 | ||
d393cefb GM |
2266 | /* NB this one still documents a specific non-nil return value. |
2267 | (As did run-hook-with-args and run-hook-with-args-until-failure | |
2268 | until they were changed in 24.1.) */ | |
a0d76c27 | 2269 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2270 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2271 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2272 | HOOK should be a symbol, a hook variable. The value of HOOK |
2273 | may be nil, a function, or a list of functions. Call each | |
2274 | function in order with arguments ARGS, stopping at the first | |
2275 | one that returns non-nil, and return that value. Otherwise (if | |
2276 | all functions return nil, or if there are no functions to call), | |
2277 | return nil. | |
9dbc9081 | 2278 | |
72e85d5d RS |
2279 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2280 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2281 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
f66c7cf8 | 2282 | (ptrdiff_t nargs, Lisp_Object *args) |
b0b667cb | 2283 | { |
f6d62986 SM |
2284 | return run_hook_with_args (nargs, args, Ffuncall); |
2285 | } | |
2286 | ||
2287 | static Lisp_Object | |
f66c7cf8 | 2288 | funcall_not (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2289 | { |
2290 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
2291 | } |
2292 | ||
a7ca3326 | 2293 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2294 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2295 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2296 | HOOK should be a symbol, a hook variable. The value of HOOK |
2297 | may be nil, a function, or a list of functions. Call each | |
2298 | function in order with arguments ARGS, stopping at the first | |
2299 | one that returns nil, and return nil. Otherwise (if all functions | |
2300 | return non-nil, or if there are no functions to call), return non-nil | |
2301 | \(do not rely on the precise return value in this case). | |
9dbc9081 | 2302 | |
72e85d5d RS |
2303 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2304 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2305 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
f66c7cf8 | 2306 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2307 | { |
f6d62986 | 2308 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
2309 | } |
2310 | ||
f6d62986 | 2311 | static Lisp_Object |
f66c7cf8 | 2312 | run_hook_wrapped_funcall (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2313 | { |
2314 | Lisp_Object tmp = args[0], ret; | |
2315 | args[0] = args[1]; | |
2316 | args[1] = tmp; | |
2317 | ret = Ffuncall (nargs, args); | |
2318 | args[1] = args[0]; | |
2319 | args[0] = tmp; | |
2320 | return ret; | |
2321 | } | |
2322 | ||
2323 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
2324 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
2325 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
2326 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
2327 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
2328 | aborts and returns that value. | |
2329 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
f66c7cf8 | 2330 | (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2331 | { |
2332 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
2333 | } | |
ff936e53 | 2334 | |
c933ea05 RS |
2335 | /* ARGS[0] should be a hook symbol. |
2336 | Call each of the functions in the hook value, passing each of them | |
2337 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 2338 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
2339 | The caller (or its caller, etc) must gcpro all of ARGS, |
2340 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2341 | ||
f6d62986 | 2342 | Lisp_Object |
f66c7cf8 PE |
2343 | run_hook_with_args (ptrdiff_t nargs, Lisp_Object *args, |
2344 | Lisp_Object (*funcall) (ptrdiff_t nargs, Lisp_Object *args)) | |
ff936e53 | 2345 | { |
f6d62986 | 2346 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 2347 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2348 | |
f029ca5f RS |
2349 | /* If we are dying or still initializing, |
2350 | don't do anything--it would probably crash if we tried. */ | |
2351 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2352 | return Qnil; |
f029ca5f | 2353 | |
b0b667cb | 2354 | sym = args[0]; |
aa681b51 | 2355 | val = find_symbol_value (sym); |
ff936e53 | 2356 | |
b0b667cb | 2357 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2358 | return ret; |
03699b14 | 2359 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2360 | { |
2361 | args[0] = val; | |
f6d62986 | 2362 | return funcall (nargs, args); |
b0b667cb KH |
2363 | } |
2364 | else | |
2365 | { | |
1faed8ae PE |
2366 | Lisp_Object global_vals = Qnil; |
2367 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2368 | |
ff936e53 | 2369 | for (; |
f6d62986 | 2370 | CONSP (val) && NILP (ret); |
03699b14 | 2371 | val = XCDR (val)) |
b0b667cb | 2372 | { |
03699b14 | 2373 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2374 | { |
2375 | /* t indicates this hook has a local binding; | |
2376 | it means to run the global binding too. */ | |
1faed8ae PE |
2377 | global_vals = Fdefault_value (sym); |
2378 | if (NILP (global_vals)) continue; | |
b0b667cb | 2379 | |
1faed8ae | 2380 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2381 | { |
1faed8ae | 2382 | args[0] = global_vals; |
f6d62986 | 2383 | ret = funcall (nargs, args); |
8932b1c2 CY |
2384 | } |
2385 | else | |
2386 | { | |
2387 | for (; | |
f6d62986 | 2388 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 2389 | global_vals = XCDR (global_vals)) |
8932b1c2 | 2390 | { |
1faed8ae | 2391 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2392 | /* In a global value, t should not occur. If it does, we |
2393 | must ignore it to avoid an endless loop. */ | |
2394 | if (!EQ (args[0], Qt)) | |
f6d62986 | 2395 | ret = funcall (nargs, args); |
8932b1c2 | 2396 | } |
b0b667cb KH |
2397 | } |
2398 | } | |
2399 | else | |
2400 | { | |
03699b14 | 2401 | args[0] = XCAR (val); |
f6d62986 | 2402 | ret = funcall (nargs, args); |
b0b667cb KH |
2403 | } |
2404 | } | |
cb9d21f8 RS |
2405 | |
2406 | UNGCPRO; | |
ff936e53 | 2407 | return ret; |
b0b667cb KH |
2408 | } |
2409 | } | |
c933ea05 | 2410 | |
7d48558f RS |
2411 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2412 | ||
2413 | void | |
d3da34e0 | 2414 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2415 | { |
2416 | Lisp_Object temp[3]; | |
2417 | temp[0] = hook; | |
2418 | temp[1] = arg1; | |
2419 | temp[2] = arg2; | |
2420 | ||
2421 | Frun_hook_with_args (3, temp); | |
2422 | } | |
ff936e53 | 2423 | \f |
f6d62986 | 2424 | /* Apply fn to arg. */ |
db9f0278 | 2425 | Lisp_Object |
d3da34e0 | 2426 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2427 | { |
a6e3fa71 JB |
2428 | struct gcpro gcpro1; |
2429 | ||
2430 | GCPRO1 (fn); | |
265a9e55 | 2431 | if (NILP (arg)) |
a6e3fa71 JB |
2432 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2433 | gcpro1.nvars = 2; | |
db9f0278 JB |
2434 | { |
2435 | Lisp_Object args[2]; | |
2436 | args[0] = fn; | |
2437 | args[1] = arg; | |
a6e3fa71 JB |
2438 | gcpro1.var = args; |
2439 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2440 | } |
db9f0278 JB |
2441 | } |
2442 | ||
f6d62986 | 2443 | /* Call function fn on no arguments. */ |
db9f0278 | 2444 | Lisp_Object |
d3da34e0 | 2445 | call0 (Lisp_Object fn) |
db9f0278 | 2446 | { |
a6e3fa71 JB |
2447 | struct gcpro gcpro1; |
2448 | ||
2449 | GCPRO1 (fn); | |
2450 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2451 | } |
2452 | ||
f6d62986 | 2453 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
2454 | /* ARGSUSED */ |
2455 | Lisp_Object | |
d3da34e0 | 2456 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2457 | { |
a6e3fa71 | 2458 | struct gcpro gcpro1; |
177c0ea7 | 2459 | Lisp_Object args[2]; |
a6e3fa71 | 2460 | |
db9f0278 | 2461 | args[0] = fn; |
15285f9f | 2462 | args[1] = arg1; |
a6e3fa71 JB |
2463 | GCPRO1 (args[0]); |
2464 | gcpro1.nvars = 2; | |
2465 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2466 | } |
2467 | ||
f6d62986 | 2468 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
2469 | /* ARGSUSED */ |
2470 | Lisp_Object | |
d3da34e0 | 2471 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2472 | { |
a6e3fa71 | 2473 | struct gcpro gcpro1; |
db9f0278 JB |
2474 | Lisp_Object args[3]; |
2475 | args[0] = fn; | |
15285f9f RS |
2476 | args[1] = arg1; |
2477 | args[2] = arg2; | |
a6e3fa71 JB |
2478 | GCPRO1 (args[0]); |
2479 | gcpro1.nvars = 3; | |
2480 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2481 | } |
2482 | ||
f6d62986 | 2483 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
2484 | /* ARGSUSED */ |
2485 | Lisp_Object | |
d3da34e0 | 2486 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2487 | { |
a6e3fa71 | 2488 | struct gcpro gcpro1; |
db9f0278 JB |
2489 | Lisp_Object args[4]; |
2490 | args[0] = fn; | |
15285f9f RS |
2491 | args[1] = arg1; |
2492 | args[2] = arg2; | |
2493 | args[3] = arg3; | |
a6e3fa71 JB |
2494 | GCPRO1 (args[0]); |
2495 | gcpro1.nvars = 4; | |
2496 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2497 | } |
2498 | ||
f6d62986 | 2499 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
2500 | /* ARGSUSED */ |
2501 | Lisp_Object | |
d3da34e0 JB |
2502 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2503 | Lisp_Object arg4) | |
a5a44b91 JB |
2504 | { |
2505 | struct gcpro gcpro1; | |
a5a44b91 JB |
2506 | Lisp_Object args[5]; |
2507 | args[0] = fn; | |
15285f9f RS |
2508 | args[1] = arg1; |
2509 | args[2] = arg2; | |
2510 | args[3] = arg3; | |
2511 | args[4] = arg4; | |
a5a44b91 JB |
2512 | GCPRO1 (args[0]); |
2513 | gcpro1.nvars = 5; | |
2514 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2515 | } |
2516 | ||
f6d62986 | 2517 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
2518 | /* ARGSUSED */ |
2519 | Lisp_Object | |
d3da34e0 JB |
2520 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2521 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2522 | { |
2523 | struct gcpro gcpro1; | |
15285f9f RS |
2524 | Lisp_Object args[6]; |
2525 | args[0] = fn; | |
2526 | args[1] = arg1; | |
2527 | args[2] = arg2; | |
2528 | args[3] = arg3; | |
2529 | args[4] = arg4; | |
2530 | args[5] = arg5; | |
2531 | GCPRO1 (args[0]); | |
2532 | gcpro1.nvars = 6; | |
2533 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2534 | } |
2535 | ||
f6d62986 | 2536 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
2537 | /* ARGSUSED */ |
2538 | Lisp_Object | |
d3da34e0 JB |
2539 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2540 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2541 | { |
2542 | struct gcpro gcpro1; | |
15285f9f RS |
2543 | Lisp_Object args[7]; |
2544 | args[0] = fn; | |
2545 | args[1] = arg1; | |
2546 | args[2] = arg2; | |
2547 | args[3] = arg3; | |
2548 | args[4] = arg4; | |
2549 | args[5] = arg5; | |
2550 | args[6] = arg6; | |
2551 | GCPRO1 (args[0]); | |
2552 | gcpro1.nvars = 7; | |
2553 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2554 | } |
2555 | ||
f6d62986 | 2556 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
2557 | /* ARGSUSED */ |
2558 | Lisp_Object | |
d3da34e0 JB |
2559 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2560 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2561 | { |
2562 | struct gcpro gcpro1; | |
574c05e2 KK |
2563 | Lisp_Object args[8]; |
2564 | args[0] = fn; | |
2565 | args[1] = arg1; | |
2566 | args[2] = arg2; | |
2567 | args[3] = arg3; | |
2568 | args[4] = arg4; | |
2569 | args[5] = arg5; | |
2570 | args[6] = arg6; | |
2571 | args[7] = arg7; | |
2572 | GCPRO1 (args[0]); | |
2573 | gcpro1.nvars = 8; | |
2574 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2575 | } |
2576 | ||
6c2ef893 RS |
2577 | /* The caller should GCPRO all the elements of ARGS. */ |
2578 | ||
a7ca3326 | 2579 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 2580 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 2581 | (Lisp_Object object) |
b9598260 | 2582 | { |
e1f29348 | 2583 | if (FUNCTIONP (object)) |
b9598260 | 2584 | return Qt; |
e1f29348 | 2585 | return Qnil; |
b9598260 SM |
2586 | } |
2587 | ||
a7ca3326 | 2588 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2589 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2590 | Return the value that function returns. | |
2591 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2592 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2593 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2594 | { |
8788120f | 2595 | Lisp_Object fun, original_fun; |
db9f0278 | 2596 | Lisp_Object funcar; |
f66c7cf8 | 2597 | ptrdiff_t numargs = nargs - 1; |
db9f0278 JB |
2598 | Lisp_Object lisp_numargs; |
2599 | Lisp_Object val; | |
2600 | struct backtrace backtrace; | |
2601 | register Lisp_Object *internal_args; | |
f66c7cf8 | 2602 | ptrdiff_t i; |
db9f0278 JB |
2603 | |
2604 | QUIT; | |
db9f0278 JB |
2605 | |
2606 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2607 | { | |
2608 | if (max_lisp_eval_depth < 100) | |
2609 | max_lisp_eval_depth = 100; | |
2610 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2611 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2612 | } |
2613 | ||
2614 | backtrace.next = backtrace_list; | |
e7c1b6ef | 2615 | backtrace.function = args[0]; |
7abaf5cc | 2616 | backtrace.args = &args[1]; /* This also GCPROs them. */ |
db9f0278 | 2617 | backtrace.nargs = nargs - 1; |
db9f0278 | 2618 | backtrace.debug_on_exit = 0; |
c2d7786e | 2619 | backtrace_list = &backtrace; |
db9f0278 | 2620 | |
7abaf5cc SM |
2621 | /* Call GC after setting up the backtrace, so the latter GCPROs the args. */ |
2622 | maybe_gc (); | |
2623 | ||
db9f0278 JB |
2624 | if (debug_on_next_call) |
2625 | do_debug_on_call (Qlambda); | |
2626 | ||
7e63e0c3 | 2627 | check_cons_list (); |
fff3ff9c | 2628 | |
8788120f KS |
2629 | original_fun = args[0]; |
2630 | ||
db9f0278 JB |
2631 | retry: |
2632 | ||
8788120f KS |
2633 | /* Optimize for no indirection. */ |
2634 | fun = original_fun; | |
eadf1faa | 2635 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2636 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2637 | fun = indirect_function (fun); |
db9f0278 | 2638 | |
90165123 | 2639 | if (SUBRP (fun)) |
db9f0278 | 2640 | { |
ef1b0ba7 | 2641 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
2642 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
2643 | { | |
a631e24c | 2644 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 2645 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
2646 | } |
2647 | ||
ef1b0ba7 | 2648 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 2649 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2650 | |
ef1b0ba7 SM |
2651 | else if (XSUBR (fun)->max_args == MANY) |
2652 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 2653 | else |
db9f0278 | 2654 | { |
ef1b0ba7 SM |
2655 | if (XSUBR (fun)->max_args > numargs) |
2656 | { | |
38182d90 PE |
2657 | internal_args = alloca (XSUBR (fun)->max_args |
2658 | * sizeof *internal_args); | |
663e2b3f | 2659 | memcpy (internal_args, args + 1, numargs * word_size); |
ef1b0ba7 SM |
2660 | for (i = numargs; i < XSUBR (fun)->max_args; i++) |
2661 | internal_args[i] = Qnil; | |
2662 | } | |
2663 | else | |
2664 | internal_args = args + 1; | |
2665 | switch (XSUBR (fun)->max_args) | |
2666 | { | |
2667 | case 0: | |
2668 | val = (XSUBR (fun)->function.a0 ()); | |
2669 | break; | |
2670 | case 1: | |
2671 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
2672 | break; | |
2673 | case 2: | |
2674 | val = (XSUBR (fun)->function.a2 | |
2675 | (internal_args[0], internal_args[1])); | |
2676 | break; | |
2677 | case 3: | |
2678 | val = (XSUBR (fun)->function.a3 | |
2679 | (internal_args[0], internal_args[1], internal_args[2])); | |
2680 | break; | |
2681 | case 4: | |
2682 | val = (XSUBR (fun)->function.a4 | |
2683 | (internal_args[0], internal_args[1], internal_args[2], | |
2684 | internal_args[3])); | |
2685 | break; | |
2686 | case 5: | |
2687 | val = (XSUBR (fun)->function.a5 | |
2688 | (internal_args[0], internal_args[1], internal_args[2], | |
2689 | internal_args[3], internal_args[4])); | |
2690 | break; | |
2691 | case 6: | |
2692 | val = (XSUBR (fun)->function.a6 | |
2693 | (internal_args[0], internal_args[1], internal_args[2], | |
2694 | internal_args[3], internal_args[4], internal_args[5])); | |
2695 | break; | |
2696 | case 7: | |
2697 | val = (XSUBR (fun)->function.a7 | |
2698 | (internal_args[0], internal_args[1], internal_args[2], | |
2699 | internal_args[3], internal_args[4], internal_args[5], | |
2700 | internal_args[6])); | |
2701 | break; | |
2702 | ||
2703 | case 8: | |
2704 | val = (XSUBR (fun)->function.a8 | |
2705 | (internal_args[0], internal_args[1], internal_args[2], | |
2706 | internal_args[3], internal_args[4], internal_args[5], | |
2707 | internal_args[6], internal_args[7])); | |
2708 | break; | |
2709 | ||
2710 | default: | |
2711 | ||
2712 | /* If a subr takes more than 8 arguments without using MANY | |
2713 | or UNEVALLED, we need to extend this function to support it. | |
2714 | Until this is done, there is no way to call the function. */ | |
1088b922 | 2715 | emacs_abort (); |
ef1b0ba7 | 2716 | } |
db9f0278 JB |
2717 | } |
2718 | } | |
ef1b0ba7 | 2719 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2720 | val = funcall_lambda (fun, numargs, args + 1); |
2721 | else | |
2722 | { | |
eadf1faa | 2723 | if (NILP (fun)) |
734d55a2 | 2724 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2725 | if (!CONSP (fun)) |
734d55a2 KS |
2726 | xsignal1 (Qinvalid_function, original_fun); |
2727 | funcar = XCAR (fun); | |
90165123 | 2728 | if (!SYMBOLP (funcar)) |
734d55a2 | 2729 | xsignal1 (Qinvalid_function, original_fun); |
defb1411 SM |
2730 | if (EQ (funcar, Qlambda) |
2731 | || EQ (funcar, Qclosure)) | |
db9f0278 | 2732 | val = funcall_lambda (fun, numargs, args + 1); |
db9f0278 JB |
2733 | else if (EQ (funcar, Qautoload)) |
2734 | { | |
7abaf5cc | 2735 | Fautoload_do_load (fun, original_fun, Qnil); |
7e63e0c3 | 2736 | check_cons_list (); |
db9f0278 JB |
2737 | goto retry; |
2738 | } | |
2739 | else | |
734d55a2 | 2740 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2741 | } |
7e63e0c3 | 2742 | check_cons_list (); |
db9f0278 JB |
2743 | lisp_eval_depth--; |
2744 | if (backtrace.debug_on_exit) | |
2745 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2746 | backtrace_list = backtrace.next; | |
2747 | return val; | |
2748 | } | |
2749 | \f | |
2f7c71a1 | 2750 | static Lisp_Object |
defb1411 | 2751 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
2752 | { |
2753 | Lisp_Object args_left; | |
d311d28c PE |
2754 | ptrdiff_t i; |
2755 | EMACS_INT numargs; | |
db9f0278 JB |
2756 | register Lisp_Object *arg_vector; |
2757 | struct gcpro gcpro1, gcpro2, gcpro3; | |
db9f0278 | 2758 | register Lisp_Object tem; |
3a7a9129 | 2759 | USE_SAFE_ALLOCA; |
db9f0278 | 2760 | |
f66c7cf8 | 2761 | numargs = XFASTINT (Flength (args)); |
c5101a77 | 2762 | SAFE_ALLOCA_LISP (arg_vector, numargs); |
db9f0278 JB |
2763 | args_left = args; |
2764 | ||
2765 | GCPRO3 (*arg_vector, args_left, fun); | |
2766 | gcpro1.nvars = 0; | |
2767 | ||
c5101a77 | 2768 | for (i = 0; i < numargs; ) |
db9f0278 JB |
2769 | { |
2770 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
defb1411 | 2771 | tem = eval_sub (tem); |
db9f0278 JB |
2772 | arg_vector[i++] = tem; |
2773 | gcpro1.nvars = i; | |
2774 | } | |
2775 | ||
2776 | UNGCPRO; | |
2777 | ||
f07a954e SM |
2778 | backtrace_list->args = arg_vector; |
2779 | backtrace_list->nargs = i; | |
c5101a77 | 2780 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
2781 | |
2782 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2783 | if (backtrace_list->debug_on_exit) | |
2784 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
2785 | /* Don't do it again when we return to eval. */ | |
2786 | backtrace_list->debug_on_exit = 0; | |
3a7a9129 | 2787 | SAFE_FREE (); |
db9f0278 JB |
2788 | return tem; |
2789 | } | |
2790 | ||
2791 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2792 | and return the result of evaluation. | |
2793 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2794 | ||
2901f1d1 | 2795 | static Lisp_Object |
f66c7cf8 | 2796 | funcall_lambda (Lisp_Object fun, ptrdiff_t nargs, |
c5101a77 | 2797 | register Lisp_Object *arg_vector) |
db9f0278 | 2798 | { |
defb1411 | 2799 | Lisp_Object val, syms_left, next, lexenv; |
d311d28c | 2800 | ptrdiff_t count = SPECPDL_INDEX (); |
f66c7cf8 | 2801 | ptrdiff_t i; |
1882aa38 | 2802 | bool optional, rest; |
db9f0278 | 2803 | |
90165123 | 2804 | if (CONSP (fun)) |
9ab90667 | 2805 | { |
defb1411 SM |
2806 | if (EQ (XCAR (fun), Qclosure)) |
2807 | { | |
2808 | fun = XCDR (fun); /* Drop `closure'. */ | |
2809 | lexenv = XCAR (fun); | |
23aba0ea | 2810 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
2811 | } |
2812 | else | |
2813 | lexenv = Qnil; | |
9ab90667 GM |
2814 | syms_left = XCDR (fun); |
2815 | if (CONSP (syms_left)) | |
2816 | syms_left = XCAR (syms_left); | |
2817 | else | |
734d55a2 | 2818 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 2819 | } |
90165123 | 2820 | else if (COMPILEDP (fun)) |
defb1411 | 2821 | { |
798cb644 SM |
2822 | syms_left = AREF (fun, COMPILED_ARGLIST); |
2823 | if (INTEGERP (syms_left)) | |
876c194c SM |
2824 | /* A byte-code object with a non-nil `push args' slot means we |
2825 | shouldn't bind any arguments, instead just call the byte-code | |
2826 | interpreter directly; it will push arguments as necessary. | |
2827 | ||
9173deec | 2828 | Byte-code objects with either a non-existent, or a nil value for |
876c194c SM |
2829 | the `push args' slot (the default), have dynamically-bound |
2830 | arguments, and use the argument-binding code below instead (as do | |
2831 | all interpreted functions, even lexically bound ones). */ | |
2832 | { | |
2833 | /* If we have not actually read the bytecode string | |
2834 | and constants vector yet, fetch them from the file. */ | |
2835 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
2836 | Ffetch_bytecode (fun); | |
2837 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
2838 | AREF (fun, COMPILED_CONSTANTS), | |
2839 | AREF (fun, COMPILED_STACK_DEPTH), | |
798cb644 | 2840 | syms_left, |
876c194c SM |
2841 | nargs, arg_vector); |
2842 | } | |
defb1411 SM |
2843 | lexenv = Qnil; |
2844 | } | |
9ab90667 | 2845 | else |
1088b922 | 2846 | emacs_abort (); |
db9f0278 | 2847 | |
9ab90667 GM |
2848 | i = optional = rest = 0; |
2849 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
2850 | { |
2851 | QUIT; | |
177c0ea7 | 2852 | |
9ab90667 | 2853 | next = XCAR (syms_left); |
8788120f | 2854 | if (!SYMBOLP (next)) |
734d55a2 | 2855 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 2856 | |
db9f0278 JB |
2857 | if (EQ (next, Qand_rest)) |
2858 | rest = 1; | |
2859 | else if (EQ (next, Qand_optional)) | |
2860 | optional = 1; | |
db9f0278 | 2861 | else |
db9f0278 | 2862 | { |
e610eaca | 2863 | Lisp_Object arg; |
defb1411 SM |
2864 | if (rest) |
2865 | { | |
e610eaca | 2866 | arg = Flist (nargs - i, &arg_vector[i]); |
defb1411 SM |
2867 | i = nargs; |
2868 | } | |
2869 | else if (i < nargs) | |
e610eaca | 2870 | arg = arg_vector[i++]; |
b9598260 SM |
2871 | else if (!optional) |
2872 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
2873 | else | |
e610eaca | 2874 | arg = Qnil; |
7200d79c | 2875 | |
b9598260 | 2876 | /* Bind the argument. */ |
876c194c | 2877 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 | 2878 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
e610eaca | 2879 | lexenv = Fcons (Fcons (next, arg), lexenv); |
b9598260 SM |
2880 | else |
2881 | /* Dynamically bind NEXT. */ | |
e610eaca | 2882 | specbind (next, arg); |
db9f0278 | 2883 | } |
db9f0278 JB |
2884 | } |
2885 | ||
9ab90667 | 2886 | if (!NILP (syms_left)) |
734d55a2 | 2887 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 2888 | else if (i < nargs) |
734d55a2 | 2889 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 2890 | |
b9598260 SM |
2891 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
2892 | /* Instantiate a new lexical environment. */ | |
2893 | specbind (Qinternal_interpreter_environment, lexenv); | |
2894 | ||
90165123 | 2895 | if (CONSP (fun)) |
9ab90667 | 2896 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 2897 | else |
ca248607 RS |
2898 | { |
2899 | /* If we have not actually read the bytecode string | |
2900 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 2901 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 2902 | Ffetch_bytecode (fun); |
b9598260 SM |
2903 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
2904 | AREF (fun, COMPILED_CONSTANTS), | |
2905 | AREF (fun, COMPILED_STACK_DEPTH), | |
2906 | Qnil, 0, 0); | |
ca248607 | 2907 | } |
177c0ea7 | 2908 | |
db9f0278 JB |
2909 | return unbind_to (count, val); |
2910 | } | |
661c7d6e KH |
2911 | |
2912 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
2913 | 1, 1, 0, |
2914 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 2915 | (Lisp_Object object) |
661c7d6e KH |
2916 | { |
2917 | Lisp_Object tem; | |
2918 | ||
845975f5 | 2919 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 2920 | { |
845975f5 | 2921 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 2922 | if (!CONSP (tem)) |
845975f5 SM |
2923 | { |
2924 | tem = AREF (object, COMPILED_BYTECODE); | |
2925 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 2926 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
2927 | else |
2928 | error ("Invalid byte code"); | |
2929 | } | |
3ae565b3 SM |
2930 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
2931 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
2932 | } |
2933 | return object; | |
2934 | } | |
db9f0278 | 2935 | \f |
475545b5 | 2936 | static void |
d3da34e0 | 2937 | grow_specpdl (void) |
db9f0278 | 2938 | { |
d311d28c PE |
2939 | register ptrdiff_t count = SPECPDL_INDEX (); |
2940 | ptrdiff_t max_size = min (max_specpdl_size, PTRDIFF_MAX); | |
98e8eae1 | 2941 | if (max_size <= specpdl_size) |
db9f0278 JB |
2942 | { |
2943 | if (max_specpdl_size < 400) | |
98e8eae1 PE |
2944 | max_size = max_specpdl_size = 400; |
2945 | if (max_size <= specpdl_size) | |
734d55a2 | 2946 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 | 2947 | } |
d311d28c | 2948 | specpdl = xpalloc (specpdl, &specpdl_size, 1, max_size, sizeof *specpdl); |
db9f0278 JB |
2949 | specpdl_ptr = specpdl + count; |
2950 | } | |
2951 | ||
f6d62986 | 2952 | /* `specpdl_ptr->symbol' is a field which describes which variable is |
4e2db1fe SM |
2953 | let-bound, so it can be properly undone when we unbind_to. |
2954 | It can have the following two shapes: | |
2955 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
2956 | a symbol that is not buffer-local (at least at the time | |
2957 | the let binding started). Note also that it should not be | |
2958 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
2959 | to record V2 here). | |
2960 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
2961 | variable SYMBOL which can be buffer-local. WHERE tells us | |
2962 | which buffer is affected (or nil if the let-binding affects the | |
2963 | global value of the variable) and BUFFER tells us which buffer was | |
2964 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
2965 | BUFFER did not yet have a buffer-local value). */ | |
2966 | ||
db9f0278 | 2967 | void |
d3da34e0 | 2968 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 2969 | { |
ce5b453a SM |
2970 | struct Lisp_Symbol *sym; |
2971 | ||
b7826503 | 2972 | CHECK_SYMBOL (symbol); |
ce5b453a | 2973 | sym = XSYMBOL (symbol); |
db9f0278 JB |
2974 | if (specpdl_ptr == specpdl + specpdl_size) |
2975 | grow_specpdl (); | |
719177b3 | 2976 | |
ce5b453a SM |
2977 | start: |
2978 | switch (sym->redirect) | |
719177b3 | 2979 | { |
ce5b453a SM |
2980 | case SYMBOL_VARALIAS: |
2981 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
2982 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
2983 | /* The most common case is that of a non-constant symbol with a |
2984 | trivial value. Make that as fast as we can. */ | |
e46f2325 DA |
2985 | set_specpdl_symbol (symbol); |
2986 | set_specpdl_old_value (SYMBOL_VAL (sym)); | |
bb8e180f AS |
2987 | specpdl_ptr->func = NULL; |
2988 | ++specpdl_ptr; | |
2989 | if (!sym->constant) | |
2990 | SET_SYMBOL_VAL (sym, value); | |
2991 | else | |
2992 | set_internal (symbol, value, Qnil, 1); | |
2993 | break; | |
4e2db1fe SM |
2994 | case SYMBOL_LOCALIZED: |
2995 | if (SYMBOL_BLV (sym)->frame_local) | |
2996 | error ("Frame-local vars cannot be let-bound"); | |
2997 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
2998 | { |
2999 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3000 | specpdl_ptr->func = 0; | |
e46f2325 | 3001 | set_specpdl_old_value (ovalue); |
ce5b453a SM |
3002 | |
3003 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3004 | || (EQ (SYMBOL_BLV (sym)->where, | |
3005 | SYMBOL_BLV (sym)->frame_local ? | |
3006 | Fselected_frame () : Fcurrent_buffer ()))); | |
3007 | ||
3008 | if (sym->redirect == SYMBOL_LOCALIZED | |
3009 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3010 | { | |
3011 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3012 | ||
3013 | /* For a local variable, record both the symbol and which | |
3014 | buffer's or frame's value we are saving. */ | |
3015 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3016 | { | |
3017 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
a04e2c62 | 3018 | || (blv_found (SYMBOL_BLV (sym)) |
ce5b453a SM |
3019 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); |
3020 | where = cur_buf; | |
3021 | } | |
3022 | else if (sym->redirect == SYMBOL_LOCALIZED | |
a04e2c62 | 3023 | && blv_found (SYMBOL_BLV (sym))) |
ce5b453a SM |
3024 | where = SYMBOL_BLV (sym)->where; |
3025 | else | |
3026 | where = Qnil; | |
3027 | ||
3028 | /* We're not using the `unused' slot in the specbinding | |
3029 | structure because this would mean we have to do more | |
3030 | work for simple variables. */ | |
3031 | /* FIXME: The third value `current_buffer' is only used in | |
3032 | let_shadows_buffer_binding_p which is itself only used | |
3033 | in set_internal for local_if_set. */ | |
4e2db1fe | 3034 | eassert (NILP (where) || EQ (where, cur_buf)); |
e46f2325 | 3035 | set_specpdl_symbol (Fcons (symbol, Fcons (where, cur_buf))); |
ce5b453a SM |
3036 | |
3037 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3038 | buffer-local value here, make the `let' change the global | |
3039 | value by changing the value of SYMBOL in all buffers not | |
3040 | having their own value. This is consistent with what | |
3041 | happens with other buffer-local variables. */ | |
3042 | if (NILP (where) | |
3043 | && sym->redirect == SYMBOL_FORWARDED) | |
3044 | { | |
3045 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3046 | ++specpdl_ptr; | |
3047 | Fset_default (symbol, value); | |
3048 | return; | |
3049 | } | |
3050 | } | |
3051 | else | |
e46f2325 | 3052 | set_specpdl_symbol (symbol); |
ce5b453a SM |
3053 | |
3054 | specpdl_ptr++; | |
94b612ad | 3055 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3056 | break; |
3057 | } | |
1088b922 | 3058 | default: emacs_abort (); |
9ab90667 | 3059 | } |
db9f0278 JB |
3060 | } |
3061 | ||
3062 | void | |
d3da34e0 | 3063 | record_unwind_protect (Lisp_Object (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
3064 | { |
3065 | if (specpdl_ptr == specpdl + specpdl_size) | |
3066 | grow_specpdl (); | |
3067 | specpdl_ptr->func = function; | |
e46f2325 DA |
3068 | set_specpdl_symbol (Qnil); |
3069 | set_specpdl_old_value (arg); | |
db9f0278 JB |
3070 | specpdl_ptr++; |
3071 | } | |
3072 | ||
3073 | Lisp_Object | |
d311d28c | 3074 | unbind_to (ptrdiff_t count, Lisp_Object value) |
db9f0278 | 3075 | { |
5a073f50 KS |
3076 | Lisp_Object quitf = Vquit_flag; |
3077 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3078 | |
5a073f50 | 3079 | GCPRO2 (value, quitf); |
db9f0278 JB |
3080 | Vquit_flag = Qnil; |
3081 | ||
3082 | while (specpdl_ptr != specpdl + count) | |
3083 | { | |
611a8f8c RS |
3084 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3085 | the work to unbind it. We decrement first | |
3086 | so that an error in unbinding won't try to unbind | |
3087 | the same entry again, and we copy the binding first | |
3088 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3089 | |
45f266dc DL |
3090 | struct specbinding this_binding; |
3091 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3092 | |
3093 | if (this_binding.func != 0) | |
3094 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3095 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3096 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3097 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3098 | bound a variable that had a buffer-local or frame-local |
3099 | binding. WHERE nil means that the variable had the default | |
0967b4b0 | 3100 | value when it was bound. CURRENT-BUFFER is the buffer that |
bb8e180f | 3101 | was current when the variable was bound. */ |
611a8f8c | 3102 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3103 | { |
eb700b82 | 3104 | Lisp_Object symbol, where; |
719177b3 | 3105 | |
611a8f8c RS |
3106 | symbol = XCAR (this_binding.symbol); |
3107 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3108 | |
eb700b82 | 3109 | if (NILP (where)) |
611a8f8c | 3110 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3111 | /* If `where' is non-nil, reset the value in the appropriate |
3112 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3113 | else if (BUFFERP (where) |
3114 | ? !NILP (Flocal_variable_p (symbol, where)) | |
e69b0960 | 3115 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) |
4e2db1fe | 3116 | set_internal (symbol, this_binding.old_value, where, 1); |
719177b3 | 3117 | } |
94b612ad SM |
3118 | /* If variable has a trivial value (no forwarding), we can |
3119 | just set it. No need to check for constant symbols here, | |
3120 | since that was already done by specbind. */ | |
3121 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3122 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3123 | this_binding.old_value); | |
db9f0278 | 3124 | else |
94b612ad SM |
3125 | /* NOTE: we only ever come here if make_local_foo was used for |
3126 | the first time on this var within this let. */ | |
3127 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3128 | } |
177c0ea7 | 3129 | |
5a073f50 KS |
3130 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3131 | Vquit_flag = quitf; | |
db9f0278 JB |
3132 | |
3133 | UNGCPRO; | |
db9f0278 JB |
3134 | return value; |
3135 | } | |
b9598260 | 3136 | |
4a330052 | 3137 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3138 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3139 | A special variable is one that will be bound dynamically, even in a | |
3140 | context where binding is lexical by default. */) | |
c566235d | 3141 | (Lisp_Object symbol) |
b9598260 SM |
3142 | { |
3143 | CHECK_SYMBOL (symbol); | |
3144 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3145 | } | |
3146 | ||
db9f0278 | 3147 | \f |
db9f0278 | 3148 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3149 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3150 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3151 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 JB |
3152 | { |
3153 | register struct backtrace *backlist = backtrace_list; | |
d311d28c | 3154 | register EMACS_INT i; |
db9f0278 | 3155 | |
b7826503 | 3156 | CHECK_NUMBER (level); |
db9f0278 JB |
3157 | |
3158 | for (i = 0; backlist && i < XINT (level); i++) | |
3159 | { | |
3160 | backlist = backlist->next; | |
3161 | } | |
3162 | ||
3163 | if (backlist) | |
265a9e55 | 3164 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3165 | |
3166 | return flag; | |
3167 | } | |
3168 | ||
3169 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3170 | doc: /* Print a trace of Lisp function calls currently active. |
3171 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3172 | (void) |
db9f0278 JB |
3173 | { |
3174 | register struct backtrace *backlist = backtrace_list; | |
db9f0278 JB |
3175 | Lisp_Object tail; |
3176 | Lisp_Object tem; | |
db9f0278 | 3177 | struct gcpro gcpro1; |
d4b6d95d | 3178 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3179 | |
d4b6d95d LMI |
3180 | if (NILP (Vprint_level)) |
3181 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 JB |
3182 | |
3183 | tail = Qnil; | |
3184 | GCPRO1 (tail); | |
3185 | ||
3186 | while (backlist) | |
3187 | { | |
3188 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
44f230aa | 3189 | if (backlist->nargs == UNEVALLED) |
db9f0278 | 3190 | { |
e7c1b6ef | 3191 | Fprin1 (Fcons (backlist->function, *backlist->args), Qnil); |
b6703b02 | 3192 | write_string ("\n", -1); |
db9f0278 JB |
3193 | } |
3194 | else | |
3195 | { | |
e7c1b6ef | 3196 | tem = backlist->function; |
f6d62986 | 3197 | Fprin1 (tem, Qnil); /* This can QUIT. */ |
db9f0278 | 3198 | write_string ("(", -1); |
44f230aa SM |
3199 | if (backlist->nargs == MANY) |
3200 | { /* FIXME: Can this happen? */ | |
1882aa38 PE |
3201 | bool later_arg = 0; |
3202 | for (tail = *backlist->args; !NILP (tail); tail = Fcdr (tail)) | |
db9f0278 | 3203 | { |
1882aa38 PE |
3204 | if (later_arg) |
3205 | write_string (" ", -1); | |
db9f0278 | 3206 | Fprin1 (Fcar (tail), Qnil); |
1882aa38 | 3207 | later_arg = 1; |
db9f0278 JB |
3208 | } |
3209 | } | |
3210 | else | |
3211 | { | |
f66c7cf8 | 3212 | ptrdiff_t i; |
db9f0278 JB |
3213 | for (i = 0; i < backlist->nargs; i++) |
3214 | { | |
3215 | if (i) write_string (" ", -1); | |
3216 | Fprin1 (backlist->args[i], Qnil); | |
3217 | } | |
3218 | } | |
b6703b02 | 3219 | write_string (")\n", -1); |
db9f0278 | 3220 | } |
db9f0278 JB |
3221 | backlist = backlist->next; |
3222 | } | |
3223 | ||
d4b6d95d | 3224 | Vprint_level = old_print_level; |
db9f0278 JB |
3225 | UNGCPRO; |
3226 | return Qnil; | |
3227 | } | |
3228 | ||
17401c97 | 3229 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3230 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3231 | If that frame has not evaluated the arguments yet (or is a special form), | |
3232 | the value is (nil FUNCTION ARG-FORMS...). | |
3233 | If that frame has evaluated its arguments and called its function already, | |
3234 | the value is (t FUNCTION ARG-VALUES...). | |
3235 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3236 | FUNCTION is whatever was supplied as car of evaluated list, | |
3237 | or a lambda expression for macro calls. | |
3238 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3239 | (Lisp_Object nframes) |
db9f0278 JB |
3240 | { |
3241 | register struct backtrace *backlist = backtrace_list; | |
5d5d959d | 3242 | register EMACS_INT i; |
db9f0278 JB |
3243 | Lisp_Object tem; |
3244 | ||
b7826503 | 3245 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3246 | |
3247 | /* Find the frame requested. */ | |
b6703b02 | 3248 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3249 | backlist = backlist->next; |
3250 | ||
3251 | if (!backlist) | |
3252 | return Qnil; | |
44f230aa | 3253 | if (backlist->nargs == UNEVALLED) |
e7c1b6ef | 3254 | return Fcons (Qnil, Fcons (backlist->function, *backlist->args)); |
db9f0278 JB |
3255 | else |
3256 | { | |
44f230aa | 3257 | if (backlist->nargs == MANY) /* FIXME: Can this happen? */ |
db9f0278 JB |
3258 | tem = *backlist->args; |
3259 | else | |
3260 | tem = Flist (backlist->nargs, backlist->args); | |
3261 | ||
e7c1b6ef | 3262 | return Fcons (Qt, Fcons (backlist->function, tem)); |
db9f0278 JB |
3263 | } |
3264 | } | |
a2ff3819 | 3265 | |
db9f0278 | 3266 | \f |
244ed907 | 3267 | #if BYTE_MARK_STACK |
4ce0541e | 3268 | void |
d3da34e0 | 3269 | mark_backtrace (void) |
4ce0541e SM |
3270 | { |
3271 | register struct backtrace *backlist; | |
f66c7cf8 | 3272 | ptrdiff_t i; |
4ce0541e SM |
3273 | |
3274 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3275 | { | |
bf20ea80 | 3276 | mark_object (backlist->function); |
4ce0541e | 3277 | |
44f230aa SM |
3278 | if (backlist->nargs == UNEVALLED |
3279 | || backlist->nargs == MANY) /* FIXME: Can this happen? */ | |
c5101a77 | 3280 | i = 1; |
4ce0541e | 3281 | else |
c5101a77 PE |
3282 | i = backlist->nargs; |
3283 | while (i--) | |
4ce0541e SM |
3284 | mark_object (backlist->args[i]); |
3285 | } | |
3286 | } | |
244ed907 | 3287 | #endif |
4ce0541e | 3288 | |
dfcf069d | 3289 | void |
d3da34e0 | 3290 | syms_of_eval (void) |
db9f0278 | 3291 | { |
29208e82 | 3292 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
fb7ada5f | 3293 | doc: /* Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3294 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3295 | an error is signaled. |
3296 | You can safely use a value considerably larger than the default value, | |
3297 | if that proves inconveniently small. However, if you increase it too far, | |
3298 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3299 | |
29208e82 | 3300 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
fb7ada5f | 3301 | doc: /* Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3302 | |
3303 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3304 | actual stack overflow in C, which would be fatal for Emacs. |
3305 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3306 | if that proves inconveniently small. However, if you increase it too far, |
3307 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3308 | |
29208e82 | 3309 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3310 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3311 | If the value is t, that means do an ordinary quit. |
3312 | If the value equals `throw-on-input', that means quit by throwing | |
3313 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3314 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3315 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3316 | Vquit_flag = Qnil; |
3317 | ||
29208e82 | 3318 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3319 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3320 | Note that `quit-flag' will still be set by typing C-g, | |
3321 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3322 | To prevent this happening, set `quit-flag' to nil | |
3323 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3324 | Vinhibit_quit = Qnil; |
3325 | ||
cd3520a4 JB |
3326 | DEFSYM (Qinhibit_quit, "inhibit-quit"); |
3327 | DEFSYM (Qautoload, "autoload"); | |
45b82ad0 | 3328 | DEFSYM (Qinhibit_debugger, "inhibit-debugger"); |
cd3520a4 JB |
3329 | DEFSYM (Qmacro, "macro"); |
3330 | DEFSYM (Qdeclare, "declare"); | |
177c0ea7 | 3331 | |
db9f0278 JB |
3332 | /* Note that the process handling also uses Qexit, but we don't want |
3333 | to staticpro it twice, so we just do it here. */ | |
cd3520a4 | 3334 | DEFSYM (Qexit, "exit"); |
b9598260 | 3335 | |
cd3520a4 JB |
3336 | DEFSYM (Qinteractive, "interactive"); |
3337 | DEFSYM (Qcommandp, "commandp"); | |
cd3520a4 JB |
3338 | DEFSYM (Qand_rest, "&rest"); |
3339 | DEFSYM (Qand_optional, "&optional"); | |
3340 | DEFSYM (Qclosure, "closure"); | |
3341 | DEFSYM (Qdebug, "debug"); | |
f01cbfdd | 3342 | |
45b82ad0 SM |
3343 | DEFVAR_LISP ("inhibit-debugger", Vinhibit_debugger, |
3344 | doc: /* Non-nil means never enter the debugger. | |
3345 | Normally set while the debugger is already active, to avoid recursive | |
3346 | invocations. */); | |
3347 | Vinhibit_debugger = Qnil; | |
3348 | ||
29208e82 | 3349 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
fb7ada5f | 3350 | doc: /* Non-nil means enter debugger if an error is signaled. |
9dbc9081 PJ |
3351 | Does not apply to errors handled by `condition-case' or those |
3352 | matched by `debug-ignored-errors'. | |
3353 | If the value is a list, an error only means to enter the debugger | |
3354 | if one of its condition symbols appears in the list. | |
3355 | When you evaluate an expression interactively, this variable | |
3356 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f | 3357 | The command `toggle-debug-on-error' toggles this. |
45b82ad0 | 3358 | See also the variable `debug-on-quit' and `inhibit-debugger'. */); |
128c0f66 | 3359 | Vdebug_on_error = Qnil; |
db9f0278 | 3360 | |
29208e82 | 3361 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
fb7ada5f | 3362 | doc: /* List of errors for which the debugger should not be called. |
9dbc9081 PJ |
3363 | Each element may be a condition-name or a regexp that matches error messages. |
3364 | If any element applies to a given error, that error skips the debugger | |
3365 | and just returns to top level. | |
3366 | This overrides the variable `debug-on-error'. | |
3367 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3368 | Vdebug_ignored_errors = Qnil; |
3369 | ||
29208e82 | 3370 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
fb7ada5f | 3371 | doc: /* Non-nil means enter debugger if quit is signaled (C-g, for example). |
82fc29a1 | 3372 | Does not apply if quit is handled by a `condition-case'. */); |
db9f0278 JB |
3373 | debug_on_quit = 0; |
3374 | ||
29208e82 | 3375 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3376 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3377 | |
29208e82 | 3378 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3379 | doc: /* Non-nil means debugger may continue execution. |
3380 | This is nil when the debugger is called under circumstances where it | |
3381 | might not be safe to continue. */); | |
dac204bc | 3382 | debugger_may_continue = 1; |
556d7314 | 3383 | |
29208e82 | 3384 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3385 | doc: /* Function to call to invoke debugger. |
3386 | If due to frame exit, args are `exit' and the value being returned; | |
3387 | this function's value will be returned instead of that. | |
3388 | If due to error, args are `error' and a list of the args to `signal'. | |
3389 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3390 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3391 | Vdebugger = Qnil; |
3392 | ||
29208e82 | 3393 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3394 | doc: /* If non-nil, this is a function for `signal' to call. |
3395 | It receives the same arguments that `signal' was given. | |
3396 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3397 | Vsignal_hook_function = Qnil; |
3398 | ||
29208e82 | 3399 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
fb7ada5f | 3400 | doc: /* Non-nil means call the debugger regardless of condition handlers. |
9dbc9081 PJ |
3401 | Note that `debug-on-error', `debug-on-quit' and friends |
3402 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3403 | Vdebug_on_signal = Qnil; |
61ede770 | 3404 | |
b38b1ec0 | 3405 | /* When lexical binding is being used, |
61b108cc | 3406 | Vinternal_interpreter_environment is non-nil, and contains an alist |
b38b1ec0 SM |
3407 | of lexically-bound variable, or (t), indicating an empty |
3408 | environment. The lisp name of this variable would be | |
3409 | `internal-interpreter-environment' if it weren't hidden. | |
3410 | Every element of this list can be either a cons (VAR . VAL) | |
3411 | specifying a lexical binding, or a single symbol VAR indicating | |
3412 | that this variable should use dynamic scoping. */ | |
61b108cc SM |
3413 | DEFSYM (Qinternal_interpreter_environment, |
3414 | "internal-interpreter-environment"); | |
b38b1ec0 SM |
3415 | DEFVAR_LISP ("internal-interpreter-environment", |
3416 | Vinternal_interpreter_environment, | |
b9598260 SM |
3417 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
3418 | When lexical binding is not being used, this variable is nil. | |
3419 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3420 | alist of active lexical bindings. */); | |
3421 | Vinternal_interpreter_environment = Qnil; | |
c80e3b4a | 3422 | /* Don't export this variable to Elisp, so no one can mess with it |
b38b1ec0 SM |
3423 | (Just imagine if someone makes it buffer-local). */ |
3424 | Funintern (Qinternal_interpreter_environment, Qnil); | |
b9598260 | 3425 | |
cd3520a4 | 3426 | DEFSYM (Vrun_hooks, "run-hooks"); |
db9f0278 JB |
3427 | |
3428 | staticpro (&Vautoload_queue); | |
3429 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3430 | staticpro (&Vsignaling_function); |
3431 | Vsignaling_function = Qnil; | |
db9f0278 | 3432 | |
d1f55f16 CY |
3433 | inhibit_lisp_code = Qnil; |
3434 | ||
db9f0278 JB |
3435 | defsubr (&Sor); |
3436 | defsubr (&Sand); | |
3437 | defsubr (&Sif); | |
3438 | defsubr (&Scond); | |
3439 | defsubr (&Sprogn); | |
3440 | defsubr (&Sprog1); | |
3441 | defsubr (&Sprog2); | |
3442 | defsubr (&Ssetq); | |
3443 | defsubr (&Squote); | |
3444 | defsubr (&Sfunction); | |
db9f0278 | 3445 | defsubr (&Sdefvar); |
19cebf5a | 3446 | defsubr (&Sdefvaralias); |
db9f0278 | 3447 | defsubr (&Sdefconst); |
513749ee | 3448 | defsubr (&Smake_var_non_special); |
db9f0278 JB |
3449 | defsubr (&Slet); |
3450 | defsubr (&SletX); | |
3451 | defsubr (&Swhile); | |
3452 | defsubr (&Smacroexpand); | |
3453 | defsubr (&Scatch); | |
3454 | defsubr (&Sthrow); | |
3455 | defsubr (&Sunwind_protect); | |
3456 | defsubr (&Scondition_case); | |
3457 | defsubr (&Ssignal); | |
db9f0278 JB |
3458 | defsubr (&Scommandp); |
3459 | defsubr (&Sautoload); | |
7abaf5cc | 3460 | defsubr (&Sautoload_do_load); |
db9f0278 JB |
3461 | defsubr (&Seval); |
3462 | defsubr (&Sapply); | |
3463 | defsubr (&Sfuncall); | |
ff936e53 SM |
3464 | defsubr (&Srun_hooks); |
3465 | defsubr (&Srun_hook_with_args); | |
3466 | defsubr (&Srun_hook_with_args_until_success); | |
3467 | defsubr (&Srun_hook_with_args_until_failure); | |
f6d62986 | 3468 | defsubr (&Srun_hook_wrapped); |
661c7d6e | 3469 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3470 | defsubr (&Sbacktrace_debug); |
3471 | defsubr (&Sbacktrace); | |
3472 | defsubr (&Sbacktrace_frame); | |
4a330052 | 3473 | defsubr (&Sspecial_variable_p); |
b9598260 | 3474 | defsubr (&Sfunctionp); |
db9f0278 | 3475 | } |