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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> |
d7306fe6 | 22 | #include <setjmp.h> |
4e2fe2e6 | 23 | #include <stdio.h> |
db9f0278 | 24 | #include "lisp.h" |
9ac0d9e0 | 25 | #include "blockinput.h" |
db9f0278 | 26 | #include "commands.h" |
1f98fa48 | 27 | #include "keyboard.h" |
3648c842 | 28 | #include "dispextern.h" |
94b612ad | 29 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 30 | |
b70e1a2b SM |
31 | #if HAVE_X_WINDOWS |
32 | #include "xterm.h" | |
33 | #endif | |
34 | ||
db9f0278 | 35 | struct backtrace |
4c576a83 GM |
36 | { |
37 | struct backtrace *next; | |
38 | Lisp_Object *function; | |
f6d62986 | 39 | Lisp_Object *args; /* Points to vector of args. */ |
bbc6b304 | 40 | ptrdiff_t nargs; /* Length of vector. */ |
f6d62986 | 41 | /* Nonzero means call value of debugger when done with this operation. */ |
bbc6b304 | 42 | unsigned int debug_on_exit : 1; |
4c576a83 | 43 | }; |
db9f0278 | 44 | |
57a96f5c | 45 | static struct backtrace *backtrace_list; |
244ed907 PE |
46 | |
47 | #if !BYTE_MARK_STACK | |
48 | static | |
49 | #endif | |
db9f0278 JB |
50 | struct catchtag *catchlist; |
51 | ||
244ed907 PE |
52 | /* Chain of condition handlers currently in effect. |
53 | The elements of this chain are contained in the stack frames | |
54 | of Fcondition_case and internal_condition_case. | |
55 | When an error is signaled (by calling Fsignal, below), | |
56 | this chain is searched for an element that applies. */ | |
57 | ||
58 | #if !BYTE_MARK_STACK | |
59 | static | |
60 | #endif | |
61 | struct handler *handlerlist; | |
62 | ||
15934ffa RS |
63 | #ifdef DEBUG_GCPRO |
64 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
65 | int gcpro_level; | |
66 | #endif | |
67 | ||
6fd797f5 | 68 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
29208e82 | 69 | Lisp_Object Qinhibit_quit; |
955cbe7b PE |
70 | Lisp_Object Qand_rest; |
71 | static Lisp_Object Qand_optional; | |
72 | static Lisp_Object Qdebug_on_error; | |
73 | static Lisp_Object Qdeclare; | |
b9598260 SM |
74 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
75 | ||
ed008a6d | 76 | static Lisp_Object Qdebug; |
db9f0278 | 77 | |
6e6e9f08 RS |
78 | /* This holds either the symbol `run-hooks' or nil. |
79 | It is nil at an early stage of startup, and when Emacs | |
80 | is shutting down. */ | |
4c576a83 | 81 | |
db9f0278 JB |
82 | Lisp_Object Vrun_hooks; |
83 | ||
84 | /* Non-nil means record all fset's and provide's, to be undone | |
85 | if the file being autoloaded is not fully loaded. | |
86 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 87 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
88 | |
89 | Lisp_Object Vautoload_queue; | |
90 | ||
91 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 92 | |
5816888b | 93 | EMACS_INT specpdl_size; |
db9f0278 JB |
94 | |
95 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 96 | |
db9f0278 JB |
97 | struct specbinding *specpdl; |
98 | ||
99 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 100 | |
ab837828 | 101 | struct specbinding *specpdl_ptr; |
db9f0278 | 102 | |
db9f0278 | 103 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 104 | |
57a96f5c | 105 | static EMACS_INT lisp_eval_depth; |
db9f0278 | 106 | |
be857679 | 107 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 108 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 109 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
110 | know that the debugger itself has an error, and we should just |
111 | signal the error instead of entering an infinite loop of debugger | |
112 | invocations. */ | |
4c576a83 | 113 | |
57a96f5c | 114 | static int when_entered_debugger; |
db9f0278 | 115 | |
a2ff3819 GM |
116 | /* The function from which the last `signal' was called. Set in |
117 | Fsignal. */ | |
118 | ||
119 | Lisp_Object Vsignaling_function; | |
120 | ||
4c576a83 GM |
121 | /* Set to non-zero while processing X events. Checked in Feval to |
122 | make sure the Lisp interpreter isn't called from a signal handler, | |
123 | which is unsafe because the interpreter isn't reentrant. */ | |
124 | ||
125 | int handling_signal; | |
126 | ||
d1f55f16 CY |
127 | /* If non-nil, Lisp code must not be run since some part of Emacs is |
128 | in an inconsistent state. Currently, x-create-frame uses this to | |
129 | avoid triggering window-configuration-change-hook while the new | |
130 | frame is half-initialized. */ | |
131 | Lisp_Object inhibit_lisp_code; | |
132 | ||
f66c7cf8 | 133 | static Lisp_Object funcall_lambda (Lisp_Object, ptrdiff_t, Lisp_Object *); |
f57e2426 | 134 | static void unwind_to_catch (struct catchtag *, Lisp_Object) NO_RETURN; |
2f7c71a1 | 135 | static int interactive_p (int); |
7200d79c | 136 | static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args); |
cd64ea1d | 137 | static Lisp_Object Ffetch_bytecode (Lisp_Object); |
873759d5 | 138 | \f |
dfcf069d | 139 | void |
d3da34e0 | 140 | init_eval_once (void) |
db9f0278 | 141 | { |
98e8eae1 PE |
142 | enum { size = 50 }; |
143 | specpdl = (struct specbinding *) xmalloc (size * sizeof (struct specbinding)); | |
144 | specpdl_size = size; | |
270e8074 | 145 | specpdl_ptr = specpdl; |
6588243d | 146 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
c530e1c2 | 147 | max_specpdl_size = 1300; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 148 | max_lisp_eval_depth = 600; |
34d470ba RS |
149 | |
150 | Vrun_hooks = Qnil; | |
db9f0278 JB |
151 | } |
152 | ||
dfcf069d | 153 | void |
d3da34e0 | 154 | init_eval (void) |
db9f0278 JB |
155 | { |
156 | specpdl_ptr = specpdl; | |
157 | catchlist = 0; | |
158 | handlerlist = 0; | |
159 | backtrace_list = 0; | |
160 | Vquit_flag = Qnil; | |
161 | debug_on_next_call = 0; | |
162 | lisp_eval_depth = 0; | |
87e21fbd | 163 | #ifdef DEBUG_GCPRO |
15934ffa | 164 | gcpro_level = 0; |
87e21fbd | 165 | #endif |
be857679 | 166 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 167 | when_entered_debugger = -1; |
db9f0278 JB |
168 | } |
169 | ||
f6d62986 | 170 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb RS |
171 | |
172 | static Lisp_Object | |
d3da34e0 | 173 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
174 | { |
175 | max_specpdl_size = XINT (XCAR (data)); | |
176 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 177 | return Qnil; |
9f5903bb RS |
178 | } |
179 | ||
180 | /* Call the Lisp debugger, giving it argument ARG. */ | |
181 | ||
475545b5 | 182 | static Lisp_Object |
d3da34e0 | 183 | call_debugger (Lisp_Object arg) |
db9f0278 | 184 | { |
3648c842 | 185 | int debug_while_redisplaying; |
aed13378 | 186 | int count = SPECPDL_INDEX (); |
3648c842 | 187 | Lisp_Object val; |
5816888b | 188 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 189 | |
9f5903bb RS |
190 | /* Temporarily bump up the stack limits, |
191 | so the debugger won't run out of stack. */ | |
177c0ea7 | 192 | |
9f5903bb RS |
193 | max_specpdl_size += 1; |
194 | record_unwind_protect (restore_stack_limits, | |
195 | Fcons (make_number (old_max), | |
196 | make_number (max_lisp_eval_depth))); | |
197 | max_specpdl_size = old_max; | |
198 | ||
199 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
200 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
201 | ||
98e8eae1 | 202 | if (max_specpdl_size - 100 < SPECPDL_INDEX ()) |
9f5903bb | 203 | max_specpdl_size = SPECPDL_INDEX () + 100; |
177c0ea7 | 204 | |
d148e14d | 205 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
206 | if (display_hourglass_p) |
207 | cancel_hourglass (); | |
237c23b0 GM |
208 | #endif |
209 | ||
db9f0278 | 210 | debug_on_next_call = 0; |
be857679 | 211 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
212 | |
213 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
214 | displayed if the debugger is invoked during redisplay. */ | |
215 | debug_while_redisplaying = redisplaying_p; | |
216 | redisplaying_p = 0; | |
556d7314 GM |
217 | specbind (intern ("debugger-may-continue"), |
218 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 219 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 220 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
221 | |
222 | #if 0 /* Binding this prevents execution of Lisp code during | |
223 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 224 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 225 | #endif |
177c0ea7 | 226 | |
3648c842 GM |
227 | val = apply1 (Vdebugger, arg); |
228 | ||
229 | /* Interrupting redisplay and resuming it later is not safe under | |
230 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 231 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
232 | if (debug_while_redisplaying) |
233 | Ftop_level (); | |
234 | ||
556d7314 | 235 | return unbind_to (count, val); |
db9f0278 JB |
236 | } |
237 | ||
475545b5 | 238 | static void |
d3da34e0 | 239 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
240 | { |
241 | debug_on_next_call = 0; | |
242 | backtrace_list->debug_on_exit = 1; | |
243 | call_debugger (Fcons (code, Qnil)); | |
244 | } | |
245 | \f | |
246 | /* NOTE!!! Every function that can call EVAL must protect its args | |
247 | and temporaries from garbage collection while it needs them. | |
248 | The definition of `For' shows what you have to do. */ | |
249 | ||
250 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
251 | doc: /* Eval args until one of them yields non-nil, then return that value. |
252 | The remaining args are not evalled at all. | |
253 | If all args return nil, return nil. | |
533eb34b | 254 | usage: (or CONDITIONS...) */) |
5842a27b | 255 | (Lisp_Object args) |
db9f0278 | 256 | { |
e509f168 | 257 | register Lisp_Object val = Qnil; |
db9f0278 JB |
258 | struct gcpro gcpro1; |
259 | ||
e509f168 | 260 | GCPRO1 (args); |
db9f0278 | 261 | |
e509f168 | 262 | while (CONSP (args)) |
db9f0278 | 263 | { |
defb1411 | 264 | val = eval_sub (XCAR (args)); |
265a9e55 | 265 | if (!NILP (val)) |
db9f0278 | 266 | break; |
e509f168 | 267 | args = XCDR (args); |
db9f0278 | 268 | } |
db9f0278 JB |
269 | |
270 | UNGCPRO; | |
271 | return val; | |
272 | } | |
273 | ||
274 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 275 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
276 | The remaining args are not evalled at all. |
277 | If no arg yields nil, return the last arg's value. | |
533eb34b | 278 | usage: (and CONDITIONS...) */) |
5842a27b | 279 | (Lisp_Object args) |
db9f0278 | 280 | { |
e509f168 | 281 | register Lisp_Object val = Qt; |
db9f0278 JB |
282 | struct gcpro gcpro1; |
283 | ||
e509f168 | 284 | GCPRO1 (args); |
db9f0278 | 285 | |
e509f168 | 286 | while (CONSP (args)) |
db9f0278 | 287 | { |
defb1411 | 288 | val = eval_sub (XCAR (args)); |
265a9e55 | 289 | if (NILP (val)) |
db9f0278 | 290 | break; |
e509f168 | 291 | args = XCDR (args); |
db9f0278 | 292 | } |
db9f0278 JB |
293 | |
294 | UNGCPRO; | |
295 | return val; | |
296 | } | |
297 | ||
298 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 299 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
300 | Returns the value of THEN or the value of the last of the ELSE's. |
301 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
302 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 303 | usage: (if COND THEN ELSE...) */) |
5842a27b | 304 | (Lisp_Object args) |
db9f0278 JB |
305 | { |
306 | register Lisp_Object cond; | |
307 | struct gcpro gcpro1; | |
308 | ||
309 | GCPRO1 (args); | |
defb1411 | 310 | cond = eval_sub (Fcar (args)); |
db9f0278 JB |
311 | UNGCPRO; |
312 | ||
265a9e55 | 313 | if (!NILP (cond)) |
defb1411 | 314 | return eval_sub (Fcar (Fcdr (args))); |
db9f0278 JB |
315 | return Fprogn (Fcdr (Fcdr (args))); |
316 | } | |
317 | ||
318 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
319 | doc: /* Try each clause until one succeeds. |
320 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
321 | and, if the value is non-nil, this clause succeeds: | |
322 | then the expressions in BODY are evaluated and the last one's | |
323 | value is the value of the cond-form. | |
324 | If no clause succeeds, cond returns nil. | |
325 | If a clause has one element, as in (CONDITION), | |
326 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 327 | usage: (cond CLAUSES...) */) |
5842a27b | 328 | (Lisp_Object args) |
db9f0278 JB |
329 | { |
330 | register Lisp_Object clause, val; | |
331 | struct gcpro gcpro1; | |
332 | ||
333 | val = Qnil; | |
334 | GCPRO1 (args); | |
265a9e55 | 335 | while (!NILP (args)) |
db9f0278 JB |
336 | { |
337 | clause = Fcar (args); | |
defb1411 | 338 | val = eval_sub (Fcar (clause)); |
265a9e55 | 339 | if (!NILP (val)) |
db9f0278 | 340 | { |
03699b14 KR |
341 | if (!EQ (XCDR (clause), Qnil)) |
342 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
343 | break; |
344 | } | |
03699b14 | 345 | args = XCDR (args); |
db9f0278 JB |
346 | } |
347 | UNGCPRO; | |
348 | ||
349 | return val; | |
350 | } | |
351 | ||
a7ca3326 | 352 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, |
9dbc9081 | 353 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 354 | usage: (progn BODY...) */) |
5842a27b | 355 | (Lisp_Object args) |
db9f0278 | 356 | { |
e509f168 | 357 | register Lisp_Object val = Qnil; |
db9f0278 JB |
358 | struct gcpro gcpro1; |
359 | ||
e509f168 | 360 | GCPRO1 (args); |
db9f0278 | 361 | |
e509f168 | 362 | while (CONSP (args)) |
db9f0278 | 363 | { |
defb1411 | 364 | val = eval_sub (XCAR (args)); |
e509f168 | 365 | args = XCDR (args); |
db9f0278 | 366 | } |
db9f0278 JB |
367 | |
368 | UNGCPRO; | |
369 | return val; | |
370 | } | |
371 | ||
372 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 373 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
374 | The value of FIRST is saved during the evaluation of the remaining args, |
375 | whose values are discarded. | |
7a25dc6d | 376 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 377 | (Lisp_Object args) |
db9f0278 JB |
378 | { |
379 | Lisp_Object val; | |
380 | register Lisp_Object args_left; | |
381 | struct gcpro gcpro1, gcpro2; | |
382 | register int argnum = 0; | |
383 | ||
9ac66b45 | 384 | if (NILP (args)) |
db9f0278 JB |
385 | return Qnil; |
386 | ||
387 | args_left = args; | |
388 | val = Qnil; | |
389 | GCPRO2 (args, val); | |
390 | ||
391 | do | |
392 | { | |
ba83908c | 393 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 394 | if (!(argnum++)) |
ba83908c SM |
395 | val = tem; |
396 | args_left = XCDR (args_left); | |
db9f0278 | 397 | } |
ba83908c | 398 | while (CONSP (args_left)); |
db9f0278 JB |
399 | |
400 | UNGCPRO; | |
401 | return val; | |
402 | } | |
403 | ||
404 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 405 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
406 | The value of FORM2 is saved during the evaluation of the |
407 | remaining args, whose values are discarded. | |
408 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 409 | (Lisp_Object args) |
db9f0278 JB |
410 | { |
411 | Lisp_Object val; | |
412 | register Lisp_Object args_left; | |
413 | struct gcpro gcpro1, gcpro2; | |
414 | register int argnum = -1; | |
415 | ||
416 | val = Qnil; | |
417 | ||
87d238ba | 418 | if (NILP (args)) |
db9f0278 JB |
419 | return Qnil; |
420 | ||
421 | args_left = args; | |
422 | val = Qnil; | |
423 | GCPRO2 (args, val); | |
424 | ||
425 | do | |
426 | { | |
ba83908c | 427 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 428 | if (!(argnum++)) |
ba83908c SM |
429 | val = tem; |
430 | args_left = XCDR (args_left); | |
db9f0278 | 431 | } |
ba83908c | 432 | while (CONSP (args_left)); |
db9f0278 JB |
433 | |
434 | UNGCPRO; | |
435 | return val; | |
436 | } | |
437 | ||
438 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
439 | doc: /* Set each SYM to the value of its VAL. |
440 | The symbols SYM are variables; they are literal (not evaluated). | |
441 | The values VAL are expressions; they are evaluated. | |
442 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
443 | The second VAL is not computed until after the first SYM is set, and so on; | |
444 | each VAL can use the new value of variables set earlier in the `setq'. | |
445 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 446 | usage: (setq [SYM VAL]...) */) |
5842a27b | 447 | (Lisp_Object args) |
db9f0278 JB |
448 | { |
449 | register Lisp_Object args_left; | |
b9598260 | 450 | register Lisp_Object val, sym, lex_binding; |
db9f0278 JB |
451 | struct gcpro gcpro1; |
452 | ||
1283140e | 453 | if (NILP (args)) |
db9f0278 JB |
454 | return Qnil; |
455 | ||
456 | args_left = args; | |
457 | GCPRO1 (args); | |
458 | ||
459 | do | |
460 | { | |
defb1411 | 461 | val = eval_sub (Fcar (Fcdr (args_left))); |
db9f0278 | 462 | sym = Fcar (args_left); |
b9598260 | 463 | |
defb1411 | 464 | /* Like for eval_sub, we do not check declared_special here since |
f07a954e SM |
465 | it's been done when let-binding. */ |
466 | if (!NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
b9598260 | 467 | && SYMBOLP (sym) |
f07a954e SM |
468 | && !NILP (lex_binding |
469 | = Fassq (sym, Vinternal_interpreter_environment))) | |
b9598260 SM |
470 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ |
471 | else | |
472 | Fset (sym, val); /* SYM is dynamically bound. */ | |
473 | ||
db9f0278 JB |
474 | args_left = Fcdr (Fcdr (args_left)); |
475 | } | |
5e617bc2 | 476 | while (!NILP (args_left)); |
db9f0278 JB |
477 | |
478 | UNGCPRO; | |
479 | return val; | |
480 | } | |
177c0ea7 | 481 | |
db9f0278 | 482 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 | 483 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
91a15bc6 SM |
484 | Warning: `quote' does not construct its return value, but just returns |
485 | the value that was pre-constructed by the Lisp reader (see info node | |
486 | `(elisp)Printed Representation'). | |
487 | This means that '(a . b) is not identical to (cons 'a 'b): the former | |
488 | does not cons. Quoting should be reserved for constants that will | |
489 | never be modified by side-effects, unless you like self-modifying code. | |
490 | See the common pitfall in info node `(elisp)Rearrangement' for an example | |
491 | of unexpected results when a quoted object is modified. | |
9dbc9081 | 492 | usage: (quote ARG) */) |
5842a27b | 493 | (Lisp_Object args) |
db9f0278 | 494 | { |
1283140e RS |
495 | if (!NILP (Fcdr (args))) |
496 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
497 | return Fcar (args); |
498 | } | |
177c0ea7 | 499 | |
db9f0278 | 500 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
501 | doc: /* Like `quote', but preferred for objects which are functions. |
502 | In byte compilation, `function' causes its argument to be compiled. | |
503 | `quote' cannot do that. | |
504 | usage: (function ARG) */) | |
5842a27b | 505 | (Lisp_Object args) |
db9f0278 | 506 | { |
b9598260 SM |
507 | Lisp_Object quoted = XCAR (args); |
508 | ||
1283140e RS |
509 | if (!NILP (Fcdr (args))) |
510 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
b9598260 SM |
511 | |
512 | if (!NILP (Vinternal_interpreter_environment) | |
513 | && CONSP (quoted) | |
514 | && EQ (XCAR (quoted), Qlambda)) | |
515 | /* This is a lambda expression within a lexical environment; | |
516 | return an interpreted closure instead of a simple lambda. */ | |
23aba0ea SM |
517 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, |
518 | XCDR (quoted))); | |
b9598260 SM |
519 | else |
520 | /* Simply quote the argument. */ | |
521 | return quoted; | |
db9f0278 JB |
522 | } |
523 | ||
e0f331ab | 524 | |
a7ca3326 | 525 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
84b17ab0 | 526 | doc: /* Return t if the containing function was run directly by user input. |
82fc29a1 JB |
527 | This means that the function was called with `call-interactively' |
528 | \(which includes being called as the binding of a key) | |
84b17ab0 | 529 | and input is currently coming from the keyboard (not a keyboard macro), |
c63df42b RS |
530 | and Emacs is not running in batch mode (`noninteractive' is nil). |
531 | ||
532 | The only known proper use of `interactive-p' is in deciding whether to | |
533 | display a helpful message, or how to display it. If you're thinking | |
534 | of using it for any other purpose, it is quite likely that you're | |
535 | making a mistake. Think: what do you want to do when the command is | |
536 | called from a keyboard macro? | |
537 | ||
84b17ab0 CY |
538 | To test whether your function was called with `call-interactively', |
539 | either (i) add an extra optional argument and give it an `interactive' | |
540 | spec that specifies non-nil unconditionally (such as \"p\"); or (ii) | |
541 | use `called-interactively-p'. */) | |
5842a27b | 542 | (void) |
db9f0278 | 543 | { |
b9598260 | 544 | return interactive_p (1) ? Qt : Qnil; |
e0f331ab GM |
545 | } |
546 | ||
547 | ||
9d28c33e | 548 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 1, 0, |
84b17ab0 | 549 | doc: /* Return t if the containing function was called by `call-interactively'. |
9d28c33e SM |
550 | If KIND is `interactive', then only return t if the call was made |
551 | interactively by the user, i.e. not in `noninteractive' mode nor | |
552 | when `executing-kbd-macro'. | |
553 | If KIND is `any', on the other hand, it will return t for any kind of | |
554 | interactive call, including being called as the binding of a key, or | |
555 | from a keyboard macro, or in `noninteractive' mode. | |
556 | ||
557 | The only known proper use of `interactive' for KIND is in deciding | |
558 | whether to display a helpful message, or how to display it. If you're | |
559 | thinking of using it for any other purpose, it is quite likely that | |
560 | you're making a mistake. Think: what do you want to do when the | |
561 | command is called from a keyboard macro? | |
84b17ab0 CY |
562 | |
563 | This function is meant for implementing advice and other | |
564 | function-modifying features. Instead of using this, it is sometimes | |
565 | cleaner to give your function an extra optional argument whose | |
566 | `interactive' spec specifies non-nil unconditionally (\"p\" is a good | |
9d28c33e | 567 | way to do this), or via (not (or executing-kbd-macro noninteractive)). */) |
5842a27b | 568 | (Lisp_Object kind) |
c63df42b | 569 | { |
9d28c33e SM |
570 | return ((INTERACTIVE || !EQ (kind, intern ("interactive"))) |
571 | && interactive_p (1)) ? Qt : Qnil; | |
c63df42b RS |
572 | } |
573 | ||
574 | ||
575 | /* Return 1 if function in which this appears was called using | |
576 | call-interactively. | |
e0f331ab GM |
577 | |
578 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
579 | called is a built-in. */ | |
580 | ||
2f7c71a1 | 581 | static int |
d3da34e0 | 582 | interactive_p (int exclude_subrs_p) |
e0f331ab GM |
583 | { |
584 | struct backtrace *btp; | |
585 | Lisp_Object fun; | |
db9f0278 | 586 | |
db9f0278 | 587 | btp = backtrace_list; |
daa37602 JB |
588 | |
589 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 590 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 591 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
592 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
593 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 594 | btp = btp->next; |
daa37602 JB |
595 | |
596 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
597 | may be a frame for Fbytecode at the top level. In any version of |
598 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
599 | inside catch and condition-case. Skip past them. | |
daa37602 | 600 | |
4402a9ed | 601 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 602 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
603 | while (btp |
604 | && (EQ (*btp->function, Qbytecode) | |
44f230aa | 605 | || btp->nargs == UNEVALLED)) |
a6e3fa71 JB |
606 | btp = btp->next; |
607 | ||
f6d62986 | 608 | /* `btp' now points at the frame of the innermost function that isn't |
daa37602 JB |
609 | a special form, ignoring frames for Finteractive_p and/or |
610 | Fbytecode at the top. If this frame is for a built-in function | |
611 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 612 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
613 | if (exclude_subrs_p && SUBRP (fun)) |
614 | return 0; | |
177c0ea7 | 615 | |
f6d62986 | 616 | /* `btp' points to the frame of a Lisp function that called interactive-p. |
db9f0278 JB |
617 | Return t if that function was called interactively. */ |
618 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
619 | return 1; |
620 | return 0; | |
db9f0278 JB |
621 | } |
622 | ||
e0f331ab | 623 | |
db9f0278 | 624 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
625 | doc: /* Define NAME as a function. |
626 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
627 | See also the function `interactive'. | |
7a25dc6d | 628 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
5842a27b | 629 | (Lisp_Object args) |
db9f0278 JB |
630 | { |
631 | register Lisp_Object fn_name; | |
632 | register Lisp_Object defn; | |
633 | ||
634 | fn_name = Fcar (args); | |
6992a868 | 635 | CHECK_SYMBOL (fn_name); |
db9f0278 | 636 | defn = Fcons (Qlambda, Fcdr (args)); |
f07a954e SM |
637 | if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */ |
638 | defn = Ffunction (Fcons (defn, Qnil)); | |
265a9e55 | 639 | if (!NILP (Vpurify_flag)) |
db9f0278 | 640 | defn = Fpurecopy (defn); |
f58e9f8c RS |
641 | if (CONSP (XSYMBOL (fn_name)->function) |
642 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
643 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 644 | Ffset (fn_name, defn); |
6fd797f5 | 645 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
646 | return fn_name; |
647 | } | |
648 | ||
649 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 650 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
651 | The actual definition looks like |
652 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
653 | When the macro is called, as in (NAME ARGS...), |
654 | the function (lambda ARGLIST BODY...) is applied to | |
655 | the list ARGS... as it appears in the expression, | |
656 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
657 | |
658 | DECL is a declaration, optional, which can specify how to indent | |
4ba50634 JPW |
659 | calls to this macro, how Edebug should handle it, and which argument |
660 | should be treated as documentation. It looks like this: | |
0654d6e3 RS |
661 | (declare SPECS...) |
662 | The elements can look like this: | |
663 | (indent INDENT) | |
664 | Set NAME's `lisp-indent-function' property to INDENT. | |
665 | ||
e509f168 | 666 | (debug DEBUG) |
0654d6e3 | 667 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 668 | equivalent to writing a `def-edebug-spec' for the macro.) |
4ba50634 JPW |
669 | |
670 | (doc-string ELT) | |
671 | Set NAME's `doc-string-elt' property to ELT. | |
672 | ||
0654d6e3 | 673 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
5842a27b | 674 | (Lisp_Object args) |
db9f0278 JB |
675 | { |
676 | register Lisp_Object fn_name; | |
677 | register Lisp_Object defn; | |
d6edd563 | 678 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
679 | |
680 | fn_name = Fcar (args); | |
8e975df9 | 681 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
682 | lambda_list = Fcar (Fcdr (args)); |
683 | tail = Fcdr (Fcdr (args)); | |
684 | ||
685 | doc = Qnil; | |
686 | if (STRINGP (Fcar (tail))) | |
687 | { | |
e509f168 SM |
688 | doc = XCAR (tail); |
689 | tail = XCDR (tail); | |
d6edd563 GM |
690 | } |
691 | ||
0193499f SM |
692 | if (CONSP (Fcar (tail)) |
693 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
d6edd563 GM |
694 | { |
695 | if (!NILP (Vmacro_declaration_function)) | |
696 | { | |
697 | struct gcpro gcpro1; | |
698 | GCPRO1 (args); | |
699 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
700 | UNGCPRO; | |
701 | } | |
177c0ea7 | 702 | |
d6edd563 GM |
703 | tail = Fcdr (tail); |
704 | } | |
705 | ||
706 | if (NILP (doc)) | |
707 | tail = Fcons (lambda_list, tail); | |
708 | else | |
709 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
7200d79c | 710 | |
b9598260 | 711 | defn = Fcons (Qlambda, tail); |
f07a954e SM |
712 | if (!NILP (Vinternal_interpreter_environment)) /* Mere optimization! */ |
713 | defn = Ffunction (Fcons (defn, Qnil)); | |
b9598260 | 714 | defn = Fcons (Qmacro, defn); |
177c0ea7 | 715 | |
265a9e55 | 716 | if (!NILP (Vpurify_flag)) |
db9f0278 | 717 | defn = Fpurecopy (defn); |
f58e9f8c RS |
718 | if (CONSP (XSYMBOL (fn_name)->function) |
719 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
720 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 721 | Ffset (fn_name, defn); |
6fd797f5 | 722 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
723 | return fn_name; |
724 | } | |
725 | ||
19cebf5a | 726 | |
1848d15d | 727 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 728 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 729 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 730 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
731 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
732 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
733 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
734 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 735 | The return value is BASE-VARIABLE. */) |
5842a27b | 736 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
737 | { |
738 | struct Lisp_Symbol *sym; | |
1848d15d | 739 | |
4a9308b8 JB |
740 | CHECK_SYMBOL (new_alias); |
741 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 742 | |
4a9308b8 | 743 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
744 | |
745 | if (sym->constant) | |
178f2507 SM |
746 | /* Not sure why, but why not? */ |
747 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
748 | |
749 | switch (sym->redirect) | |
750 | { | |
751 | case SYMBOL_FORWARDED: | |
752 | error ("Cannot make an internal variable an alias"); | |
753 | case SYMBOL_LOCALIZED: | |
754 | error ("Don't know how to make a localized variable an alias"); | |
755 | } | |
756 | ||
dd60787c | 757 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
758 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
759 | so that old-code that affects n_a before the aliasing is setup | |
760 | still works. */ | |
761 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 762 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
763 | |
764 | { | |
765 | struct specbinding *p; | |
766 | ||
767 | for (p = specpdl_ptr - 1; p >= specpdl; p--) | |
768 | if (p->func == NULL | |
769 | && (EQ (new_alias, | |
770 | CONSP (p->symbol) ? XCAR (p->symbol) : p->symbol))) | |
771 | error ("Don't know how to make a let-bound variable an alias"); | |
772 | } | |
773 | ||
b9598260 | 774 | sym->declared_special = 1; |
0ac30604 | 775 | XSYMBOL (base_variable)->declared_special = 1; |
ce5b453a SM |
776 | sym->redirect = SYMBOL_VARALIAS; |
777 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
778 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
779 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
780 | /* Even if docstring is nil: remove old docstring. */ |
781 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 782 | |
4a9308b8 | 783 | return base_variable; |
19cebf5a GM |
784 | } |
785 | ||
786 | ||
db9f0278 | 787 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 788 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
c3a70e2b CY |
789 | You are not required to define a variable in order to use it, but |
790 | defining it lets you supply an initial value and documentation, which | |
791 | can be referred to by the Emacs help facilities and other programming | |
792 | tools. The `defvar' form also declares the variable as \"special\", | |
793 | so that it is always dynamically bound even if `lexical-binding' is t. | |
794 | ||
795 | The optional argument INITVALUE is evaluated, and used to set SYMBOL, | |
796 | only if SYMBOL's value is void. If SYMBOL is buffer-local, its | |
797 | default value is what is set; buffer-local values are not affected. | |
9dbc9081 | 798 | If INITVALUE is missing, SYMBOL's value is not set. |
733f68b6 LT |
799 | |
800 | If SYMBOL has a local binding, then this form affects the local | |
801 | binding. This is usually not what you want. Thus, if you need to | |
802 | load a file defining variables, with this form or with `defconst' or | |
803 | `defcustom', you should always load that file _outside_ any bindings | |
804 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
805 | this respect.) | |
c3a70e2b CY |
806 | |
807 | The optional argument DOCSTRING is a documentation string for the | |
808 | variable. | |
809 | ||
810 | To define a user option, use `defcustom' instead of `defvar'. | |
811 | The function `user-variable-p' also identifies a variable as a user | |
812 | option if its DOCSTRING starts with *, but this behavior is obsolete. | |
2df5238c | 813 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 814 | (Lisp_Object args) |
db9f0278 | 815 | { |
a42ba017 | 816 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
817 | |
818 | sym = Fcar (args); | |
a42ba017 RS |
819 | tail = Fcdr (args); |
820 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 821 | error ("Too many arguments"); |
a42ba017 | 822 | |
33568849 | 823 | tem = Fdefault_boundp (sym); |
a42ba017 | 824 | if (!NILP (tail)) |
db9f0278 | 825 | { |
ba83908c SM |
826 | /* Do it before evaluating the initial value, for self-references. */ |
827 | XSYMBOL (sym)->declared_special = 1; | |
590130fb | 828 | |
1c9916a1 SM |
829 | if (SYMBOL_CONSTANT_P (sym)) |
830 | { | |
831 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
1faed8ae PE |
832 | Lisp_Object tem1 = Fcar (tail); |
833 | if (! (CONSP (tem1) | |
834 | && EQ (XCAR (tem1), Qquote) | |
835 | && CONSP (XCDR (tem1)) | |
836 | && EQ (XCAR (XCDR (tem1)), sym))) | |
1c9916a1 SM |
837 | error ("Constant symbol `%s' specified in defvar", |
838 | SDATA (SYMBOL_NAME (sym))); | |
839 | } | |
840 | ||
265a9e55 | 841 | if (NILP (tem)) |
defb1411 | 842 | Fset_default (sym, eval_sub (Fcar (tail))); |
d0bce91e SM |
843 | else |
844 | { /* Check if there is really a global binding rather than just a let | |
845 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 846 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
847 | while (--pdl >= specpdl) |
848 | { | |
849 | if (EQ (pdl->symbol, sym) && !pdl->func | |
850 | && EQ (pdl->old_value, Qunbound)) | |
851 | { | |
852 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
853 | SYMBOL_NAME (sym), 1); | |
854 | break; | |
855 | } | |
856 | } | |
857 | } | |
33568849 | 858 | tail = Fcdr (tail); |
e509f168 SM |
859 | tem = Fcar (tail); |
860 | if (!NILP (tem)) | |
33568849 | 861 | { |
33568849 SM |
862 | if (!NILP (Vpurify_flag)) |
863 | tem = Fpurecopy (tem); | |
864 | Fput (sym, Qvariable_documentation, tem); | |
865 | } | |
6fd797f5 | 866 | LOADHIST_ATTACH (sym); |
db9f0278 | 867 | } |
f07a954e SM |
868 | else if (!NILP (Vinternal_interpreter_environment) |
869 | && !XSYMBOL (sym)->declared_special) | |
870 | /* A simple (defvar foo) with lexical scoping does "nothing" except | |
871 | declare that var to be dynamically scoped *locally* (i.e. within | |
872 | the current file or let-block). */ | |
873 | Vinternal_interpreter_environment = | |
874 | Fcons (sym, Vinternal_interpreter_environment); | |
33568849 | 875 | else |
d28a2170 PE |
876 | { |
877 | /* Simple (defvar <var>) should not count as a definition at all. | |
878 | It could get in the way of other definitions, and unloading this | |
879 | package could try to make the variable unbound. */ | |
880 | } | |
addf35fd | 881 | |
db9f0278 JB |
882 | return sym; |
883 | } | |
884 | ||
885 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 | 886 | doc: /* Define SYMBOL as a constant variable. |
c3a70e2b CY |
887 | This declares that neither programs nor users should ever change the |
888 | value. This constancy is not actually enforced by Emacs Lisp, but | |
889 | SYMBOL is marked as a special variable so that it is never lexically | |
890 | bound. | |
891 | ||
892 | The `defconst' form always sets the value of SYMBOL to the result of | |
893 | evalling INITVALUE. If SYMBOL is buffer-local, its default value is | |
894 | what is set; buffer-local values are not affected. If SYMBOL has a | |
895 | local binding, then this form sets the local binding's value. | |
896 | However, you should normally not make local bindings for variables | |
897 | defined with this form. | |
898 | ||
899 | The optional DOCSTRING specifies the variable's documentation string. | |
7a25dc6d | 900 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 901 | (Lisp_Object args) |
db9f0278 JB |
902 | { |
903 | register Lisp_Object sym, tem; | |
904 | ||
905 | sym = Fcar (args); | |
a42ba017 | 906 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 907 | error ("Too many arguments"); |
a42ba017 | 908 | |
defb1411 | 909 | tem = eval_sub (Fcar (Fcdr (args))); |
1182a7cb DL |
910 | if (!NILP (Vpurify_flag)) |
911 | tem = Fpurecopy (tem); | |
912 | Fset_default (sym, tem); | |
b9598260 | 913 | XSYMBOL (sym)->declared_special = 1; |
db9f0278 | 914 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 915 | if (!NILP (tem)) |
db9f0278 | 916 | { |
265a9e55 | 917 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
918 | tem = Fpurecopy (tem); |
919 | Fput (sym, Qvariable_documentation, tem); | |
920 | } | |
873759d5 | 921 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 922 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
923 | return sym; |
924 | } | |
925 | ||
606cdb89 JB |
926 | /* Error handler used in Fuser_variable_p. */ |
927 | static Lisp_Object | |
d3da34e0 | 928 | user_variable_p_eh (Lisp_Object ignore) |
606cdb89 JB |
929 | { |
930 | return Qnil; | |
931 | } | |
932 | ||
40a69fac SM |
933 | static Lisp_Object |
934 | lisp_indirect_variable (Lisp_Object sym) | |
935 | { | |
cfcbfb1a PE |
936 | struct Lisp_Symbol *s = indirect_variable (XSYMBOL (sym)); |
937 | XSETSYMBOL (sym, s); | |
40a69fac SM |
938 | return sym; |
939 | } | |
940 | ||
db9f0278 | 941 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 942 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 943 | \(The alternative is a variable used internally in a Lisp program.) |
0b21c100 CY |
944 | |
945 | This function returns t if (i) the first character of its | |
946 | documentation is `*', or (ii) it is customizable (its property list | |
947 | contains a non-nil value of `standard-value' or `custom-autoload'), or | |
948 | \(iii) it is an alias for a user variable. | |
949 | ||
950 | But condition (i) is considered obsolete, so for most purposes this is | |
951 | equivalent to `custom-variable-p'. */) | |
5842a27b | 952 | (Lisp_Object variable) |
db9f0278 JB |
953 | { |
954 | Lisp_Object documentation; | |
177c0ea7 | 955 | |
5e78e475 RS |
956 | if (!SYMBOLP (variable)) |
957 | return Qnil; | |
958 | ||
606cdb89 | 959 | /* If indirect and there's an alias loop, don't check anything else. */ |
ce5b453a | 960 | if (XSYMBOL (variable)->redirect == SYMBOL_VARALIAS |
40a69fac | 961 | && NILP (internal_condition_case_1 (lisp_indirect_variable, variable, |
bb8e180f | 962 | Qt, user_variable_p_eh))) |
606cdb89 JB |
963 | return Qnil; |
964 | ||
965 | while (1) | |
966 | { | |
967 | documentation = Fget (variable, Qvariable_documentation); | |
968 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
bb8e180f | 969 | return Qt; |
606cdb89 | 970 | if (STRINGP (documentation) |
bb8e180f AS |
971 | && ((unsigned char) SREF (documentation, 0) == '*')) |
972 | return Qt; | |
606cdb89 JB |
973 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ |
974 | if (CONSP (documentation) | |
bb8e180f AS |
975 | && STRINGP (XCAR (documentation)) |
976 | && INTEGERP (XCDR (documentation)) | |
977 | && XINT (XCDR (documentation)) < 0) | |
978 | return Qt; | |
606cdb89 JB |
979 | /* Customizable? See `custom-variable-p'. */ |
980 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
bb8e180f AS |
981 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) |
982 | return Qt; | |
606cdb89 | 983 | |
ce5b453a | 984 | if (!(XSYMBOL (variable)->redirect == SYMBOL_VARALIAS)) |
bb8e180f | 985 | return Qnil; |
606cdb89 JB |
986 | |
987 | /* An indirect variable? Let's follow the chain. */ | |
ce5b453a | 988 | XSETSYMBOL (variable, SYMBOL_ALIAS (XSYMBOL (variable))); |
606cdb89 | 989 | } |
177c0ea7 | 990 | } |
db9f0278 JB |
991 | \f |
992 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
993 | doc: /* Bind variables according to VARLIST then eval BODY. |
994 | The value of the last form in BODY is returned. | |
995 | Each element of VARLIST is a symbol (which is bound to nil) | |
996 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
997 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 998 | usage: (let* VARLIST BODY...) */) |
5842a27b | 999 | (Lisp_Object args) |
db9f0278 | 1000 | { |
b9598260 | 1001 | Lisp_Object varlist, var, val, elt, lexenv; |
aed13378 | 1002 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
1003 | struct gcpro gcpro1, gcpro2, gcpro3; |
1004 | ||
1005 | GCPRO3 (args, elt, varlist); | |
1006 | ||
b9598260 SM |
1007 | lexenv = Vinternal_interpreter_environment; |
1008 | ||
db9f0278 | 1009 | varlist = Fcar (args); |
b9598260 | 1010 | while (CONSP (varlist)) |
db9f0278 JB |
1011 | { |
1012 | QUIT; | |
b9598260 SM |
1013 | |
1014 | elt = XCAR (varlist); | |
90165123 | 1015 | if (SYMBOLP (elt)) |
b9598260 SM |
1016 | { |
1017 | var = elt; | |
1018 | val = Qnil; | |
1019 | } | |
08564963 | 1020 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1021 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1022 | else |
1023 | { | |
b9598260 | 1024 | var = Fcar (elt); |
defb1411 | 1025 | val = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 | 1026 | } |
b9598260 | 1027 | |
f07a954e SM |
1028 | if (!NILP (lexenv) && SYMBOLP (var) |
1029 | && !XSYMBOL (var)->declared_special | |
1030 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
1031 | /* Lexically bind VAR by adding it to the interpreter's binding |
1032 | alist. */ | |
1033 | { | |
f07a954e SM |
1034 | Lisp_Object newenv |
1035 | = Fcons (Fcons (var, val), Vinternal_interpreter_environment); | |
1036 | if (EQ (Vinternal_interpreter_environment, lexenv)) | |
1037 | /* Save the old lexical environment on the specpdl stack, | |
1038 | but only for the first lexical binding, since we'll never | |
1039 | need to revert to one of the intermediate ones. */ | |
1040 | specbind (Qinternal_interpreter_environment, newenv); | |
1041 | else | |
1042 | Vinternal_interpreter_environment = newenv; | |
db9f0278 | 1043 | } |
b9598260 SM |
1044 | else |
1045 | specbind (var, val); | |
1046 | ||
1047 | varlist = XCDR (varlist); | |
db9f0278 JB |
1048 | } |
1049 | UNGCPRO; | |
1050 | val = Fprogn (Fcdr (args)); | |
1051 | return unbind_to (count, val); | |
1052 | } | |
1053 | ||
1054 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1055 | doc: /* Bind variables according to VARLIST then eval BODY. |
1056 | The value of the last form in BODY is returned. | |
1057 | Each element of VARLIST is a symbol (which is bound to nil) | |
1058 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1059 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 1060 | usage: (let VARLIST BODY...) */) |
5842a27b | 1061 | (Lisp_Object args) |
db9f0278 | 1062 | { |
b9598260 | 1063 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 1064 | register Lisp_Object elt, varlist; |
aed13378 | 1065 | int count = SPECPDL_INDEX (); |
f66c7cf8 | 1066 | ptrdiff_t argnum; |
db9f0278 | 1067 | struct gcpro gcpro1, gcpro2; |
3a7a9129 | 1068 | USE_SAFE_ALLOCA; |
db9f0278 JB |
1069 | |
1070 | varlist = Fcar (args); | |
1071 | ||
f6d62986 | 1072 | /* Make space to hold the values to give the bound variables. */ |
db9f0278 | 1073 | elt = Flength (varlist); |
b72e0717 | 1074 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 | 1075 | |
f6d62986 | 1076 | /* Compute the values and store them in `temps'. */ |
db9f0278 JB |
1077 | |
1078 | GCPRO2 (args, *temps); | |
1079 | gcpro2.nvars = 0; | |
1080 | ||
67ee9f6e | 1081 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
1082 | { |
1083 | QUIT; | |
67ee9f6e | 1084 | elt = XCAR (varlist); |
90165123 | 1085 | if (SYMBOLP (elt)) |
db9f0278 | 1086 | temps [argnum++] = Qnil; |
08564963 | 1087 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1088 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 | 1089 | else |
defb1411 | 1090 | temps [argnum++] = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 JB |
1091 | gcpro2.nvars = argnum; |
1092 | } | |
1093 | UNGCPRO; | |
1094 | ||
b9598260 SM |
1095 | lexenv = Vinternal_interpreter_environment; |
1096 | ||
db9f0278 | 1097 | varlist = Fcar (args); |
67ee9f6e | 1098 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 1099 | { |
b9598260 SM |
1100 | Lisp_Object var; |
1101 | ||
67ee9f6e | 1102 | elt = XCAR (varlist); |
b9598260 | 1103 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 1104 | tem = temps[argnum++]; |
b9598260 | 1105 | |
f07a954e SM |
1106 | if (!NILP (lexenv) && SYMBOLP (var) |
1107 | && !XSYMBOL (var)->declared_special | |
1108 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
1109 | /* Lexically bind VAR by adding it to the lexenv alist. */ |
1110 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 1111 | else |
b9598260 SM |
1112 | /* Dynamically bind VAR. */ |
1113 | specbind (var, tem); | |
db9f0278 JB |
1114 | } |
1115 | ||
b9598260 SM |
1116 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
1117 | /* Instantiate a new lexical environment. */ | |
1118 | specbind (Qinternal_interpreter_environment, lexenv); | |
1119 | ||
db9f0278 | 1120 | elt = Fprogn (Fcdr (args)); |
3a7a9129 | 1121 | SAFE_FREE (); |
db9f0278 JB |
1122 | return unbind_to (count, elt); |
1123 | } | |
1124 | ||
1125 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1126 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1127 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1128 | until TEST returns nil. | |
7a25dc6d | 1129 | usage: (while TEST BODY...) */) |
5842a27b | 1130 | (Lisp_Object args) |
db9f0278 | 1131 | { |
2b9bde76 | 1132 | Lisp_Object test, body; |
db9f0278 JB |
1133 | struct gcpro gcpro1, gcpro2; |
1134 | ||
1135 | GCPRO2 (test, body); | |
1136 | ||
1137 | test = Fcar (args); | |
1138 | body = Fcdr (args); | |
defb1411 | 1139 | while (!NILP (eval_sub (test))) |
db9f0278 JB |
1140 | { |
1141 | QUIT; | |
1142 | Fprogn (body); | |
1143 | } | |
1144 | ||
1145 | UNGCPRO; | |
1146 | return Qnil; | |
1147 | } | |
1148 | ||
1149 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1150 | doc: /* Return result of expanding macros at top level of FORM. |
1151 | If FORM is not a macro call, it is returned unchanged. | |
1152 | Otherwise, the macro is expanded and the expansion is considered | |
1153 | in place of FORM. When a non-macro-call results, it is returned. | |
1154 | ||
1155 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1156 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 1157 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 1158 | { |
23d6b5a6 | 1159 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1160 | register Lisp_Object expander, sym, def, tem; |
1161 | ||
1162 | while (1) | |
1163 | { | |
1164 | /* Come back here each time we expand a macro call, | |
1165 | in case it expands into another macro call. */ | |
90165123 | 1166 | if (!CONSP (form)) |
db9f0278 | 1167 | break; |
23d6b5a6 | 1168 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1169 | def = sym = XCAR (form); |
23d6b5a6 | 1170 | tem = Qnil; |
db9f0278 JB |
1171 | /* Trace symbols aliases to other symbols |
1172 | until we get a symbol that is not an alias. */ | |
90165123 | 1173 | while (SYMBOLP (def)) |
db9f0278 JB |
1174 | { |
1175 | QUIT; | |
23d6b5a6 | 1176 | sym = def; |
79e8bfbf | 1177 | tem = Fassq (sym, environment); |
265a9e55 | 1178 | if (NILP (tem)) |
db9f0278 JB |
1179 | { |
1180 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1181 | if (!EQ (def, Qunbound)) |
1182 | continue; | |
db9f0278 | 1183 | } |
23d6b5a6 | 1184 | break; |
db9f0278 | 1185 | } |
79e8bfbf | 1186 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1187 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1188 | if (NILP (tem)) |
db9f0278 | 1189 | { |
79e8bfbf | 1190 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1191 | Look at its function definition. */ |
90165123 | 1192 | if (EQ (def, Qunbound) || !CONSP (def)) |
f6d62986 | 1193 | /* Not defined or definition not suitable. */ |
db9f0278 | 1194 | break; |
03699b14 | 1195 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1196 | { |
1197 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1198 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1199 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1200 | /* Yes, load it and try again. */ |
1201 | { | |
ca20916b RS |
1202 | struct gcpro gcpro1; |
1203 | GCPRO1 (form); | |
ee9ee63c | 1204 | do_autoload (def, sym); |
ca20916b | 1205 | UNGCPRO; |
ee9ee63c JB |
1206 | continue; |
1207 | } | |
1208 | else | |
db9f0278 | 1209 | break; |
db9f0278 | 1210 | } |
03699b14 | 1211 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1212 | break; |
03699b14 | 1213 | else expander = XCDR (def); |
db9f0278 JB |
1214 | } |
1215 | else | |
1216 | { | |
03699b14 | 1217 | expander = XCDR (tem); |
265a9e55 | 1218 | if (NILP (expander)) |
db9f0278 JB |
1219 | break; |
1220 | } | |
03699b14 | 1221 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1222 | } |
1223 | return form; | |
1224 | } | |
1225 | \f | |
1226 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1227 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1228 | TAG is evalled to get the tag to use; it must not be nil. | |
1229 | ||
1230 | Then the BODY is executed. | |
1d632ccf | 1231 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1232 | If no throw happens, `catch' returns the value of the last BODY form. |
1233 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1234 | usage: (catch TAG BODY...) */) |
5842a27b | 1235 | (Lisp_Object args) |
db9f0278 JB |
1236 | { |
1237 | register Lisp_Object tag; | |
1238 | struct gcpro gcpro1; | |
1239 | ||
1240 | GCPRO1 (args); | |
defb1411 | 1241 | tag = eval_sub (Fcar (args)); |
db9f0278 JB |
1242 | UNGCPRO; |
1243 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1244 | } | |
1245 | ||
1246 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1247 | FUNC should return a Lisp_Object. | |
1248 | This is how catches are done from within C code. */ | |
1249 | ||
1250 | Lisp_Object | |
d3da34e0 | 1251 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1252 | { |
1253 | /* This structure is made part of the chain `catchlist'. */ | |
1254 | struct catchtag c; | |
1255 | ||
1256 | /* Fill in the components of c, and put it on the list. */ | |
1257 | c.next = catchlist; | |
1258 | c.tag = tag; | |
1259 | c.val = Qnil; | |
1260 | c.backlist = backtrace_list; | |
1261 | c.handlerlist = handlerlist; | |
1262 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1263 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1264 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1265 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1266 | c.gcpro = gcprolist; |
bcf28080 | 1267 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1268 | catchlist = &c; |
1269 | ||
1270 | /* Call FUNC. */ | |
1271 | if (! _setjmp (c.jmp)) | |
1272 | c.val = (*func) (arg); | |
1273 | ||
1274 | /* Throw works by a longjmp that comes right here. */ | |
1275 | catchlist = c.next; | |
1276 | return c.val; | |
1277 | } | |
1278 | ||
ba410f40 JB |
1279 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1280 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1281 | |
ba410f40 JB |
1282 | This is the guts Fthrow and Fsignal; they differ only in the way |
1283 | they choose the catch tag to throw to. A catch tag for a | |
1284 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1285 | |
ba410f40 JB |
1286 | Before each catch is discarded, unbind all special bindings and |
1287 | execute all unwind-protect clauses made above that catch. Unwind | |
1288 | the handler stack as we go, so that the proper handlers are in | |
1289 | effect for each unwind-protect clause we run. At the end, restore | |
1290 | some static info saved in CATCH, and longjmp to the location | |
1291 | specified in the | |
1292 | ||
1293 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1294 | |
1295 | static void | |
d3da34e0 | 1296 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 JB |
1297 | { |
1298 | register int last_time; | |
1299 | ||
ba410f40 JB |
1300 | /* Save the value in the tag. */ |
1301 | catch->val = value; | |
1302 | ||
0b31741c | 1303 | /* Restore certain special C variables. */ |
1cdc3155 | 1304 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1305 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1306 | handling_signal = 0; |
69bbd6bd | 1307 | immediate_quit = 0; |
82da7701 | 1308 | |
db9f0278 JB |
1309 | do |
1310 | { | |
1311 | last_time = catchlist == catch; | |
82da7701 JB |
1312 | |
1313 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1314 | handlers. */ |
db9f0278 JB |
1315 | unbind_to (catchlist->pdlcount, Qnil); |
1316 | handlerlist = catchlist->handlerlist; | |
1317 | catchlist = catchlist->next; | |
1318 | } | |
1319 | while (! last_time); | |
1320 | ||
a2a103bb | 1321 | #if HAVE_X_WINDOWS |
88019a63 RS |
1322 | /* If x_catch_errors was done, turn it off now. |
1323 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 | 1324 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
bb8e180f AS |
1325 | The catch must remain in effect during that delicate |
1326 | state. --lorentey */ | |
88019a63 | 1327 | x_fully_uncatch_errors (); |
e6aee454 | 1328 | #endif |
a2a103bb | 1329 | #endif |
88019a63 | 1330 | |
bcf28080 | 1331 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1332 | gcprolist = catch->gcpro; |
15934ffa | 1333 | #ifdef DEBUG_GCPRO |
d8e2b5ba | 1334 | gcpro_level = gcprolist ? gcprolist->level + 1 : 0; |
15934ffa | 1335 | #endif |
db9f0278 JB |
1336 | backtrace_list = catch->backlist; |
1337 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1338 | |
ba410f40 | 1339 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1340 | } |
1341 | ||
a7ca3326 | 1342 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, |
9dbc9081 PJ |
1343 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1344 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1345 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1346 | { |
1347 | register struct catchtag *c; | |
1348 | ||
8788120f KS |
1349 | if (!NILP (tag)) |
1350 | for (c = catchlist; c; c = c->next) | |
1351 | { | |
1352 | if (EQ (c->tag, tag)) | |
1353 | unwind_to_catch (c, value); | |
1354 | } | |
734d55a2 | 1355 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1356 | } |
1357 | ||
1358 | ||
1359 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1360 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1361 | If BODYFORM completes normally, its value is returned | |
1362 | after executing the UNWINDFORMS. | |
1363 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1364 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1365 | (Lisp_Object args) |
db9f0278 JB |
1366 | { |
1367 | Lisp_Object val; | |
aed13378 | 1368 | int count = SPECPDL_INDEX (); |
db9f0278 | 1369 | |
04b28167 | 1370 | record_unwind_protect (Fprogn, Fcdr (args)); |
defb1411 | 1371 | val = eval_sub (Fcar (args)); |
177c0ea7 | 1372 | return unbind_to (count, val); |
db9f0278 JB |
1373 | } |
1374 | \f | |
db9f0278 | 1375 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, |
9dbc9081 | 1376 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1377 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1378 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1379 | where the BODY is made of Lisp expressions. | |
1380 | ||
1381 | A handler is applicable to an error | |
1382 | if CONDITION-NAME is one of the error's condition names. | |
1383 | If an error happens, the first applicable handler is run. | |
1384 | ||
024a2d76 CY |
1385 | The car of a handler may be a list of condition names instead of a |
1386 | single condition name; then it handles all of them. If the special | |
1387 | condition name `debug' is present in this list, it allows another | |
1388 | condition in the list to run the debugger if `debug-on-error' and the | |
1389 | other usual mechanisms says it should (otherwise, `condition-case' | |
1390 | suppresses the debugger). | |
9dbc9081 | 1391 | |
c997bb25 RS |
1392 | When a handler handles an error, control returns to the `condition-case' |
1393 | and it executes the handler's BODY... | |
d0acbbaf | 1394 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1395 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1396 | Then the value of the last BODY form is returned from the `condition-case' |
1397 | expression. | |
9dbc9081 | 1398 | |
9dbc9081 | 1399 | See also the function `signal' for more info. |
2b47b74d | 1400 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1401 | (Lisp_Object args) |
db9f0278 | 1402 | { |
17401c97 GM |
1403 | register Lisp_Object bodyform, handlers; |
1404 | volatile Lisp_Object var; | |
db9f0278 | 1405 | |
82da7701 JB |
1406 | var = Fcar (args); |
1407 | bodyform = Fcar (Fcdr (args)); | |
1408 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1409 | |
1410 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1411 | } | |
1412 | ||
1413 | /* Like Fcondition_case, but the args are separate | |
1414 | rather than passed in a list. Used by Fbyte_code. */ | |
1415 | ||
1416 | Lisp_Object | |
d3da34e0 JB |
1417 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1418 | Lisp_Object handlers) | |
ee830945 RS |
1419 | { |
1420 | Lisp_Object val; | |
1421 | struct catchtag c; | |
1422 | struct handler h; | |
1423 | ||
b7826503 | 1424 | CHECK_SYMBOL (var); |
82da7701 | 1425 | |
2b47b74d | 1426 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1427 | { |
1428 | Lisp_Object tem; | |
2b47b74d | 1429 | tem = XCAR (val); |
5f96776a RS |
1430 | if (! (NILP (tem) |
1431 | || (CONSP (tem) | |
03699b14 KR |
1432 | && (SYMBOLP (XCAR (tem)) |
1433 | || CONSP (XCAR (tem)))))) | |
e6c3da20 EZ |
1434 | error ("Invalid condition handler: %s", |
1435 | SDATA (Fprin1_to_string (tem, Qt))); | |
82da7701 | 1436 | } |
db9f0278 JB |
1437 | |
1438 | c.tag = Qnil; | |
1439 | c.val = Qnil; | |
1440 | c.backlist = backtrace_list; | |
1441 | c.handlerlist = handlerlist; | |
1442 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1443 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1444 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1445 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1446 | c.gcpro = gcprolist; |
bcf28080 | 1447 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1448 | if (_setjmp (c.jmp)) |
1449 | { | |
265a9e55 | 1450 | if (!NILP (h.var)) |
bb8e180f | 1451 | specbind (h.var, c.val); |
9d58218c | 1452 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1453 | |
1454 | /* Note that this just undoes the binding of h.var; whoever | |
1455 | longjumped to us unwound the stack to c.pdlcount before | |
1456 | throwing. */ | |
db9f0278 JB |
1457 | unbind_to (c.pdlcount, Qnil); |
1458 | return val; | |
1459 | } | |
1460 | c.next = catchlist; | |
1461 | catchlist = &c; | |
177c0ea7 | 1462 | |
82da7701 JB |
1463 | h.var = var; |
1464 | h.handler = handlers; | |
db9f0278 | 1465 | h.next = handlerlist; |
db9f0278 JB |
1466 | h.tag = &c; |
1467 | handlerlist = &h; | |
1468 | ||
defb1411 | 1469 | val = eval_sub (bodyform); |
db9f0278 JB |
1470 | catchlist = c.next; |
1471 | handlerlist = h.next; | |
1472 | return val; | |
1473 | } | |
1474 | ||
f029ca5f RS |
1475 | /* Call the function BFUN with no arguments, catching errors within it |
1476 | according to HANDLERS. If there is an error, call HFUN with | |
1477 | one argument which is the data that describes the error: | |
1478 | (SIGNALNAME . DATA) | |
1479 | ||
1480 | HANDLERS can be a list of conditions to catch. | |
1481 | If HANDLERS is Qt, catch all errors. | |
1482 | If HANDLERS is Qerror, catch all errors | |
1483 | but allow the debugger to run if that is enabled. */ | |
1484 | ||
db9f0278 | 1485 | Lisp_Object |
d3da34e0 JB |
1486 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1487 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1488 | { |
1489 | Lisp_Object val; | |
1490 | struct catchtag c; | |
1491 | struct handler h; | |
1492 | ||
1493 | c.tag = Qnil; | |
1494 | c.val = Qnil; | |
1495 | c.backlist = backtrace_list; | |
1496 | c.handlerlist = handlerlist; | |
1497 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1498 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1499 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1500 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1501 | c.gcpro = gcprolist; |
bcf28080 | 1502 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1503 | if (_setjmp (c.jmp)) |
1504 | { | |
9d58218c | 1505 | return (*hfun) (c.val); |
db9f0278 JB |
1506 | } |
1507 | c.next = catchlist; | |
1508 | catchlist = &c; | |
1509 | h.handler = handlers; | |
1510 | h.var = Qnil; | |
db9f0278 JB |
1511 | h.next = handlerlist; |
1512 | h.tag = &c; | |
1513 | handlerlist = &h; | |
1514 | ||
1515 | val = (*bfun) (); | |
1516 | catchlist = c.next; | |
1517 | handlerlist = h.next; | |
1518 | return val; | |
1519 | } | |
1520 | ||
2659a09f | 1521 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1522 | |
d227775c | 1523 | Lisp_Object |
d3da34e0 JB |
1524 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1525 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1526 | { |
1527 | Lisp_Object val; | |
1528 | struct catchtag c; | |
1529 | struct handler h; | |
1530 | ||
1531 | c.tag = Qnil; | |
1532 | c.val = Qnil; | |
1533 | c.backlist = backtrace_list; | |
1534 | c.handlerlist = handlerlist; | |
1535 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1536 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1537 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1538 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1539 | c.gcpro = gcprolist; |
bcf28080 | 1540 | c.byte_stack = byte_stack_list; |
d227775c RS |
1541 | if (_setjmp (c.jmp)) |
1542 | { | |
9d58218c | 1543 | return (*hfun) (c.val); |
d227775c RS |
1544 | } |
1545 | c.next = catchlist; | |
1546 | catchlist = &c; | |
1547 | h.handler = handlers; | |
1548 | h.var = Qnil; | |
1549 | h.next = handlerlist; | |
1550 | h.tag = &c; | |
1551 | handlerlist = &h; | |
1552 | ||
1553 | val = (*bfun) (arg); | |
1554 | catchlist = c.next; | |
1555 | handlerlist = h.next; | |
1556 | return val; | |
1557 | } | |
10b29d41 | 1558 | |
53967e09 CY |
1559 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1560 | its arguments. */ | |
1561 | ||
1562 | Lisp_Object | |
178f2507 SM |
1563 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1564 | Lisp_Object arg1, | |
1565 | Lisp_Object arg2, | |
1566 | Lisp_Object handlers, | |
1567 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1568 | { |
1569 | Lisp_Object val; | |
1570 | struct catchtag c; | |
1571 | struct handler h; | |
1572 | ||
53967e09 CY |
1573 | c.tag = Qnil; |
1574 | c.val = Qnil; | |
1575 | c.backlist = backtrace_list; | |
1576 | c.handlerlist = handlerlist; | |
1577 | c.lisp_eval_depth = lisp_eval_depth; | |
1578 | c.pdlcount = SPECPDL_INDEX (); | |
1579 | c.poll_suppress_count = poll_suppress_count; | |
1580 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1581 | c.gcpro = gcprolist; | |
1582 | c.byte_stack = byte_stack_list; | |
1583 | if (_setjmp (c.jmp)) | |
1584 | { | |
1585 | return (*hfun) (c.val); | |
1586 | } | |
1587 | c.next = catchlist; | |
1588 | catchlist = &c; | |
1589 | h.handler = handlers; | |
1590 | h.var = Qnil; | |
1591 | h.next = handlerlist; | |
1592 | h.tag = &c; | |
1593 | handlerlist = &h; | |
1594 | ||
1595 | val = (*bfun) (arg1, arg2); | |
1596 | catchlist = c.next; | |
1597 | handlerlist = h.next; | |
1598 | return val; | |
1599 | } | |
10b29d41 | 1600 | |
2659a09f | 1601 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1602 | and ARGS as second argument. */ |
1603 | ||
1604 | Lisp_Object | |
f66c7cf8 PE |
1605 | internal_condition_case_n (Lisp_Object (*bfun) (ptrdiff_t, Lisp_Object *), |
1606 | ptrdiff_t nargs, | |
178f2507 SM |
1607 | Lisp_Object *args, |
1608 | Lisp_Object handlers, | |
1609 | Lisp_Object (*hfun) (Lisp_Object)) | |
10b29d41 GM |
1610 | { |
1611 | Lisp_Object val; | |
1612 | struct catchtag c; | |
1613 | struct handler h; | |
1614 | ||
1615 | c.tag = Qnil; | |
1616 | c.val = Qnil; | |
1617 | c.backlist = backtrace_list; | |
1618 | c.handlerlist = handlerlist; | |
1619 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1620 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1621 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1622 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1623 | c.gcpro = gcprolist; |
1624 | c.byte_stack = byte_stack_list; | |
1625 | if (_setjmp (c.jmp)) | |
1626 | { | |
1627 | return (*hfun) (c.val); | |
1628 | } | |
1629 | c.next = catchlist; | |
1630 | catchlist = &c; | |
1631 | h.handler = handlers; | |
1632 | h.var = Qnil; | |
1633 | h.next = handlerlist; | |
1634 | h.tag = &c; | |
1635 | handlerlist = &h; | |
1636 | ||
1637 | val = (*bfun) (nargs, args); | |
1638 | catchlist = c.next; | |
1639 | handlerlist = h.next; | |
1640 | return val; | |
1641 | } | |
1642 | ||
d227775c | 1643 | \f |
7d47b580 | 1644 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object); |
e7f7fbaa SM |
1645 | static int maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1646 | Lisp_Object data); | |
db9f0278 | 1647 | |
6d5eb5b0 SM |
1648 | void |
1649 | process_quit_flag (void) | |
1650 | { | |
1651 | Lisp_Object flag = Vquit_flag; | |
1652 | Vquit_flag = Qnil; | |
1653 | if (EQ (flag, Qkill_emacs)) | |
1654 | Fkill_emacs (Qnil); | |
1655 | if (EQ (Vthrow_on_input, flag)) | |
1656 | Fthrow (Vthrow_on_input, Qt); | |
1657 | Fsignal (Qquit, Qnil); | |
1658 | } | |
1659 | ||
a7ca3326 | 1660 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, |
9dbc9081 PJ |
1661 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1662 | This function does not return. | |
1663 | ||
1664 | An error symbol is a symbol with an `error-conditions' property | |
1665 | that is a list of condition names. | |
1666 | A handler for any of those names will get to handle this signal. | |
1667 | The symbol `error' should normally be one of them. | |
1668 | ||
1669 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1670 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1671 | error message is constructed. | |
9dbc9081 PJ |
1672 | If the signal is handled, DATA is made available to the handler. |
1673 | See also the function `condition-case'. */) | |
5842a27b | 1674 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1675 | { |
bfa8ca43 | 1676 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1677 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1678 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1679 | Lisp_Object conditions; |
c11d3d17 | 1680 | Lisp_Object string; |
e7f7fbaa SM |
1681 | Lisp_Object real_error_symbol |
1682 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1683 | register Lisp_Object clause = Qnil; | |
1684 | struct handler *h; | |
a2ff3819 | 1685 | struct backtrace *bp; |
db9f0278 | 1686 | |
346598f1 | 1687 | immediate_quit = handling_signal = 0; |
d063129f | 1688 | abort_on_gc = 0; |
db9f0278 JB |
1689 | if (gc_in_progress || waiting_for_input) |
1690 | abort (); | |
1691 | ||
26631f2b RS |
1692 | #if 0 /* rms: I don't know why this was here, |
1693 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1694 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1695 | if (display_hourglass_p) |
1696 | cancel_hourglass (); | |
48f8dfa3 | 1697 | #endif |
177c0ea7 | 1698 | #endif |
48f8dfa3 | 1699 | |
61ede770 | 1700 | /* This hook is used by edebug. */ |
26631f2b RS |
1701 | if (! NILP (Vsignal_hook_function) |
1702 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1703 | { |
1704 | /* Edebug takes care of restoring these variables when it exits. */ | |
1705 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1706 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1707 | ||
1708 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1709 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1710 | ||
1711 | call2 (Vsignal_hook_function, error_symbol, data); | |
1712 | } | |
61ede770 | 1713 | |
1ea9dec4 | 1714 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1715 | |
a2ff3819 GM |
1716 | /* Remember from where signal was called. Skip over the frame for |
1717 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1718 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1719 | is a memory-full error. */ | |
090a072f | 1720 | Vsignaling_function = Qnil; |
26631f2b | 1721 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1722 | { |
1723 | bp = backtrace_list->next; | |
1724 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1725 | bp = bp->next; | |
1726 | if (bp && bp->function) | |
1727 | Vsignaling_function = *bp->function; | |
1728 | } | |
a2ff3819 | 1729 | |
e7f7fbaa | 1730 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1731 | { |
7d47b580 | 1732 | clause = find_handler_clause (h->handler, conditions); |
265a9e55 | 1733 | if (!NILP (clause)) |
e7f7fbaa | 1734 | break; |
db9f0278 | 1735 | } |
475545b5 | 1736 | |
e7f7fbaa SM |
1737 | if (/* Don't run the debugger for a memory-full error. |
1738 | (There is no room in memory to do that!) */ | |
1739 | !NILP (error_symbol) | |
1740 | && (!NILP (Vdebug_on_signal) | |
1741 | /* If no handler is present now, try to run the debugger. */ | |
1742 | || NILP (clause) | |
bd1ba3e8 CY |
1743 | /* A `debug' symbol in the handler list disables the normal |
1744 | suppression of the debugger. */ | |
1745 | || (CONSP (clause) && CONSP (XCAR (clause)) | |
1746 | && !NILP (Fmemq (Qdebug, XCAR (clause)))) | |
e7f7fbaa SM |
1747 | /* Special handler that means "print a message and run debugger |
1748 | if requested". */ | |
1749 | || EQ (h->handler, Qerror))) | |
1750 | { | |
1751 | int debugger_called | |
1752 | = maybe_call_debugger (conditions, error_symbol, data); | |
1753 | /* We can't return values to code which signaled an error, but we | |
1754 | can continue code which has signaled a quit. */ | |
1755 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
1756 | return Qnil; | |
475545b5 | 1757 | } |
db9f0278 | 1758 | |
e7f7fbaa SM |
1759 | if (!NILP (clause)) |
1760 | { | |
1761 | Lisp_Object unwind_data | |
1762 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 1763 | |
e7f7fbaa SM |
1764 | h->chosen_clause = clause; |
1765 | unwind_to_catch (h->tag, unwind_data); | |
1766 | } | |
1767 | else | |
1768 | { | |
1769 | if (catchlist != 0) | |
1770 | Fthrow (Qtop_level, Qt); | |
1771 | } | |
c11d3d17 | 1772 | |
1ea9dec4 | 1773 | if (! NILP (error_symbol)) |
c11d3d17 | 1774 | data = Fcons (error_symbol, data); |
475545b5 | 1775 | |
c11d3d17 | 1776 | string = Ferror_message_string (data); |
583f48b9 | 1777 | fatal ("%s", SDATA (string)); |
db9f0278 JB |
1778 | } |
1779 | ||
734d55a2 KS |
1780 | /* Internal version of Fsignal that never returns. |
1781 | Used for anything but Qquit (which can return from Fsignal). */ | |
1782 | ||
1783 | void | |
d3da34e0 | 1784 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1785 | { |
1786 | Fsignal (error_symbol, data); | |
1787 | abort (); | |
1788 | } | |
1789 | ||
1790 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1791 | ||
1792 | void | |
d3da34e0 | 1793 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1794 | { |
1795 | xsignal (error_symbol, Qnil); | |
1796 | } | |
1797 | ||
1798 | void | |
d3da34e0 | 1799 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1800 | { |
1801 | xsignal (error_symbol, list1 (arg)); | |
1802 | } | |
1803 | ||
1804 | void | |
d3da34e0 | 1805 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1806 | { |
1807 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1808 | } | |
1809 | ||
1810 | void | |
d3da34e0 | 1811 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1812 | { |
1813 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1814 | } | |
1815 | ||
1816 | /* Signal `error' with message S, and additional arg ARG. | |
1817 | If ARG is not a genuine list, make it a one-element list. */ | |
1818 | ||
1819 | void | |
a8fe7202 | 1820 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1821 | { |
1822 | Lisp_Object tortoise, hare; | |
1823 | ||
1824 | hare = tortoise = arg; | |
1825 | while (CONSP (hare)) | |
1826 | { | |
1827 | hare = XCDR (hare); | |
1828 | if (!CONSP (hare)) | |
1829 | break; | |
1830 | ||
1831 | hare = XCDR (hare); | |
1832 | tortoise = XCDR (tortoise); | |
1833 | ||
1834 | if (EQ (hare, tortoise)) | |
1835 | break; | |
1836 | } | |
1837 | ||
1838 | if (!NILP (hare)) | |
1839 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1840 | ||
1841 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1842 | } | |
1843 | ||
1844 | ||
e0f24100 | 1845 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1846 | a list containing one of CONDITIONS. */ |
1847 | ||
1848 | static int | |
d3da34e0 | 1849 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1850 | { |
4de86b16 | 1851 | if (NILP (list)) |
128c0f66 RM |
1852 | return 0; |
1853 | if (! CONSP (list)) | |
1854 | return 1; | |
1855 | ||
ab67260b | 1856 | while (CONSP (conditions)) |
128c0f66 | 1857 | { |
ab67260b | 1858 | Lisp_Object this, tail; |
03699b14 KR |
1859 | this = XCAR (conditions); |
1860 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1861 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1862 | return 1; |
03699b14 | 1863 | conditions = XCDR (conditions); |
128c0f66 | 1864 | } |
ab67260b | 1865 | return 0; |
128c0f66 RM |
1866 | } |
1867 | ||
fc950e09 KH |
1868 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1869 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1870 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1871 | |
1872 | static int | |
d3da34e0 | 1873 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1874 | { |
1875 | Lisp_Object tail; | |
1876 | int first_string = 1; | |
1877 | Lisp_Object error_message; | |
1878 | ||
17401c97 GM |
1879 | error_message = Qnil; |
1880 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1881 | { |
03699b14 | 1882 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1883 | { |
1884 | if (first_string) | |
1885 | { | |
1886 | error_message = Ferror_message_string (data); | |
1887 | first_string = 0; | |
1888 | } | |
177c0ea7 | 1889 | |
03699b14 | 1890 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1891 | return 1; |
1892 | } | |
1893 | else | |
1894 | { | |
1895 | Lisp_Object contail; | |
1896 | ||
17401c97 | 1897 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1898 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1899 | return 1; |
1900 | } | |
1901 | } | |
1902 | ||
1903 | return 0; | |
1904 | } | |
1905 | ||
ddaa36e1 | 1906 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
7d47b580 JB |
1907 | SIG and DATA describe the signal. There are two ways to pass them: |
1908 | = SIG is the error symbol, and DATA is the rest of the data. | |
1909 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). | |
1910 | This is for memory-full errors only. */ | |
ddaa36e1 | 1911 | static int |
d3da34e0 | 1912 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1913 | { |
1914 | Lisp_Object combined_data; | |
1915 | ||
1916 | combined_data = Fcons (sig, data); | |
1917 | ||
1918 | if ( | |
1919 | /* Don't try to run the debugger with interrupts blocked. | |
1920 | The editing loop would return anyway. */ | |
1921 | ! INPUT_BLOCKED_P | |
1922 | /* Does user want to enter debugger for this kind of error? */ | |
1923 | && (EQ (sig, Qquit) | |
1924 | ? debug_on_quit | |
1925 | : wants_debugger (Vdebug_on_error, conditions)) | |
1926 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1927 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1928 | && when_entered_debugger < num_nonmacro_input_events) |
1929 | { | |
1930 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1931 | return 1; | |
1932 | } | |
1933 | ||
1934 | return 0; | |
1935 | } | |
1936 | ||
db9f0278 | 1937 | static Lisp_Object |
7d47b580 | 1938 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions) |
db9f0278 JB |
1939 | { |
1940 | register Lisp_Object h; | |
db9f0278 | 1941 | |
f01cbfdd RS |
1942 | /* t is used by handlers for all conditions, set up by C code. */ |
1943 | if (EQ (handlers, Qt)) | |
db9f0278 | 1944 | return Qt; |
f01cbfdd | 1945 | |
61ede770 RS |
1946 | /* error is used similarly, but means print an error message |
1947 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1948 | if (EQ (handlers, Qerror)) |
1949 | return Qt; | |
f01cbfdd | 1950 | |
e7f7fbaa | 1951 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1952 | { |
e7f7fbaa SM |
1953 | Lisp_Object handler = XCAR (h); |
1954 | Lisp_Object condit, tem; | |
5f96776a | 1955 | |
5f96776a | 1956 | if (!CONSP (handler)) |
db9f0278 | 1957 | continue; |
e7f7fbaa | 1958 | condit = XCAR (handler); |
5f96776a RS |
1959 | /* Handle a single condition name in handler HANDLER. */ |
1960 | if (SYMBOLP (condit)) | |
1961 | { | |
1962 | tem = Fmemq (Fcar (handler), conditions); | |
1963 | if (!NILP (tem)) | |
1964 | return handler; | |
1965 | } | |
1966 | /* Handle a list of condition names in handler HANDLER. */ | |
1967 | else if (CONSP (condit)) | |
1968 | { | |
f01cbfdd RS |
1969 | Lisp_Object tail; |
1970 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1971 | { |
e7f7fbaa | 1972 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1973 | if (!NILP (tem)) |
e7f7fbaa | 1974 | return handler; |
5f96776a RS |
1975 | } |
1976 | } | |
db9f0278 | 1977 | } |
f01cbfdd | 1978 | |
db9f0278 JB |
1979 | return Qnil; |
1980 | } | |
1981 | ||
db9f0278 | 1982 | |
f6d62986 | 1983 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1984 | void |
b3ffc17c | 1985 | verror (const char *m, va_list ap) |
db9f0278 | 1986 | { |
70476b54 | 1987 | char buf[4000]; |
c2d1e36d PE |
1988 | ptrdiff_t size = sizeof buf; |
1989 | ptrdiff_t size_max = STRING_BYTES_BOUND + 1; | |
9125da08 | 1990 | char *buffer = buf; |
c2d1e36d | 1991 | ptrdiff_t used; |
9125da08 RS |
1992 | Lisp_Object string; |
1993 | ||
d749b01b | 1994 | used = evxprintf (&buffer, &size, buf, size_max, m, ap); |
5fdb398c | 1995 | string = make_string (buffer, used); |
eb3f1cc8 | 1996 | if (buffer != buf) |
9ae6734f | 1997 | xfree (buffer); |
9125da08 | 1998 | |
734d55a2 | 1999 | xsignal1 (Qerror, string); |
db9f0278 | 2000 | } |
b3ffc17c DN |
2001 | |
2002 | ||
f6d62986 | 2003 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
2004 | |
2005 | /* VARARGS 1 */ | |
2006 | void | |
2007 | error (const char *m, ...) | |
2008 | { | |
2009 | va_list ap; | |
2010 | va_start (ap, m); | |
2011 | verror (m, ap); | |
2012 | va_end (ap); | |
2013 | } | |
db9f0278 | 2014 | \f |
a7ca3326 | 2015 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
2016 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
2017 | This means it contains a description for how to read arguments to give it. | |
2018 | The value is nil for an invalid function or a symbol with no function | |
2019 | definition. | |
2020 | ||
2021 | Interactively callable functions include strings and vectors (treated | |
2022 | as keyboard macros), lambda-expressions that contain a top-level call | |
2023 | to `interactive', autoload definitions made by `autoload' with non-nil | |
2024 | fourth argument, and some of the built-in functions of Lisp. | |
2025 | ||
e72706be RS |
2026 | Also, a symbol satisfies `commandp' if its function definition does so. |
2027 | ||
2028 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2029 | then strings and vectors are not accepted. */) |
5842a27b | 2030 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
2031 | { |
2032 | register Lisp_Object fun; | |
2033 | register Lisp_Object funcar; | |
52b71f49 | 2034 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2035 | |
2036 | fun = function; | |
2037 | ||
52b71f49 SM |
2038 | fun = indirect_function (fun); /* Check cycles. */ |
2039 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2040 | return Qnil; |
db9f0278 | 2041 | |
52b71f49 SM |
2042 | /* Check an `interactive-form' property if present, analogous to the |
2043 | function-documentation property. */ | |
2044 | fun = function; | |
2045 | while (SYMBOLP (fun)) | |
2046 | { | |
2b9aa051 | 2047 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
2048 | if (!NILP (tmp)) |
2049 | if_prop = Qt; | |
2050 | fun = Fsymbol_function (fun); | |
2051 | } | |
2052 | ||
db9f0278 JB |
2053 | /* Emacs primitives are interactive if their DEFUN specifies an |
2054 | interactive spec. */ | |
90165123 | 2055 | if (SUBRP (fun)) |
04724b69 | 2056 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2057 | |
2058 | /* Bytecode objects are interactive if they are long enough to | |
2059 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2060 | where the interactive spec is stored. */ | |
90165123 | 2061 | else if (COMPILEDP (fun)) |
845975f5 | 2062 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2063 | ? Qt : if_prop); |
db9f0278 JB |
2064 | |
2065 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2066 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2067 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2068 | |
2069 | /* Lists may represent commands. */ | |
2070 | if (!CONSP (fun)) | |
2071 | return Qnil; | |
ed16fb98 | 2072 | funcar = XCAR (fun); |
b38b1ec0 | 2073 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
2074 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
2075 | ? Qt : if_prop); | |
23aba0ea | 2076 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 2077 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 2078 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 2079 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2080 | else |
2081 | return Qnil; | |
2082 | } | |
2083 | ||
db9f0278 | 2084 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
2085 | doc: /* Define FUNCTION to autoload from FILE. |
2086 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2087 | Third arg DOCSTRING is documentation for the function. | |
2088 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2089 | Fifth arg TYPE indicates the type of the object: | |
2090 | nil or omitted says FUNCTION is a function, | |
2091 | `keymap' says FUNCTION is really a keymap, and | |
2092 | `macro' or t says FUNCTION is really a macro. | |
2093 | Third through fifth args give info about the real definition. | |
2094 | They default to nil. | |
2095 | If FUNCTION is already defined other than as an autoload, | |
2096 | this does nothing and returns nil. */) | |
5842a27b | 2097 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 2098 | { |
b7826503 PJ |
2099 | CHECK_SYMBOL (function); |
2100 | CHECK_STRING (file); | |
db9f0278 | 2101 | |
f6d62986 | 2102 | /* If function is defined and not as an autoload, don't override. */ |
db9f0278 | 2103 | if (!EQ (XSYMBOL (function)->function, Qunbound) |
90165123 | 2104 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2105 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2106 | return Qnil; |
2107 | ||
7973e637 SM |
2108 | if (NILP (Vpurify_flag)) |
2109 | /* Only add entries after dumping, because the ones before are | |
2110 | not useful and else we get loads of them from the loaddefs.el. */ | |
2111 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
905a9ed3 | 2112 | else |
a56eaaef | 2113 | /* We don't want the docstring in purespace (instead, |
d6d23852 SM |
2114 | Snarf-documentation should (hopefully) overwrite it). |
2115 | We used to use 0 here, but that leads to accidental sharing in | |
2116 | purecopy's hash-consing, so we use a (hopefully) unique integer | |
2117 | instead. */ | |
51639eac | 2118 | docstring = make_number (XPNTR (function)); |
a56eaaef DN |
2119 | return Ffset (function, |
2120 | Fpurecopy (list5 (Qautoload, file, docstring, | |
2121 | interactive, type))); | |
db9f0278 JB |
2122 | } |
2123 | ||
2124 | Lisp_Object | |
d3da34e0 | 2125 | un_autoload (Lisp_Object oldqueue) |
db9f0278 JB |
2126 | { |
2127 | register Lisp_Object queue, first, second; | |
2128 | ||
2129 | /* Queue to unwind is current value of Vautoload_queue. | |
2130 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2131 | queue = Vautoload_queue; | |
2132 | Vautoload_queue = oldqueue; | |
2133 | while (CONSP (queue)) | |
2134 | { | |
e509f168 | 2135 | first = XCAR (queue); |
db9f0278 JB |
2136 | second = Fcdr (first); |
2137 | first = Fcar (first); | |
47b82df9 RS |
2138 | if (EQ (first, make_number (0))) |
2139 | Vfeatures = second; | |
db9f0278 JB |
2140 | else |
2141 | Ffset (first, second); | |
e509f168 | 2142 | queue = XCDR (queue); |
db9f0278 JB |
2143 | } |
2144 | return Qnil; | |
2145 | } | |
2146 | ||
ca20916b RS |
2147 | /* Load an autoloaded function. |
2148 | FUNNAME is the symbol which is the function's name. | |
2149 | FUNDEF is the autoload definition (a list). */ | |
2150 | ||
045ba794 | 2151 | void |
d3da34e0 | 2152 | do_autoload (Lisp_Object fundef, Lisp_Object funname) |
db9f0278 | 2153 | { |
aed13378 | 2154 | int count = SPECPDL_INDEX (); |
d945992e | 2155 | Lisp_Object fun; |
ca20916b | 2156 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2157 | |
aea6173f RS |
2158 | /* This is to make sure that loadup.el gives a clear picture |
2159 | of what files are preloaded and when. */ | |
ab4db096 RS |
2160 | if (! NILP (Vpurify_flag)) |
2161 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2162 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2163 | |
db9f0278 | 2164 | fun = funname; |
b7826503 | 2165 | CHECK_SYMBOL (funname); |
ca20916b | 2166 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2167 | |
f87740dc | 2168 | /* Preserve the match data. */ |
89f2614d | 2169 | record_unwind_save_match_data (); |
177c0ea7 | 2170 | |
a04ee161 RS |
2171 | /* If autoloading gets an error (which includes the error of failing |
2172 | to define the function being called), we use Vautoload_queue | |
2173 | to undo function definitions and `provide' calls made by | |
2174 | the function. We do this in the specific case of autoloading | |
2175 | because autoloading is not an explicit request "load this file", | |
2176 | but rather a request to "call this function". | |
d3da34e0 | 2177 | |
a04ee161 | 2178 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
2179 | record_unwind_protect (un_autoload, Vautoload_queue); |
2180 | Vautoload_queue = Qt; | |
7351b242 | 2181 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2182 | |
db9f0278 JB |
2183 | /* Once loading finishes, don't undo it. */ |
2184 | Vautoload_queue = Qt; | |
2185 | unbind_to (count, Qnil); | |
2186 | ||
a7f96a35 | 2187 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2188 | |
76c2b0cc | 2189 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2190 | error ("Autoloading failed to define function %s", |
d5db4077 | 2191 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2192 | UNGCPRO; |
db9f0278 | 2193 | } |
4c576a83 | 2194 | |
db9f0278 | 2195 | \f |
a7ca3326 | 2196 | DEFUN ("eval", Feval, Seval, 1, 2, 0, |
a0ee6f27 SM |
2197 | doc: /* Evaluate FORM and return its value. |
2198 | If LEXICAL is t, evaluate using lexical scoping. */) | |
2199 | (Lisp_Object form, Lisp_Object lexical) | |
defb1411 SM |
2200 | { |
2201 | int count = SPECPDL_INDEX (); | |
a0ee6f27 SM |
2202 | specbind (Qinternal_interpreter_environment, |
2203 | NILP (lexical) ? Qnil : Fcons (Qt, Qnil)); | |
defb1411 SM |
2204 | return unbind_to (count, eval_sub (form)); |
2205 | } | |
2206 | ||
2207 | /* Eval a sub-expression of the current expression (i.e. in the same | |
2208 | lexical scope). */ | |
2209 | Lisp_Object | |
2210 | eval_sub (Lisp_Object form) | |
db9f0278 JB |
2211 | { |
2212 | Lisp_Object fun, val, original_fun, original_args; | |
2213 | Lisp_Object funcar; | |
2214 | struct backtrace backtrace; | |
2215 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2216 | ||
df470e3b | 2217 | if (handling_signal) |
48f8dfa3 | 2218 | abort (); |
177c0ea7 | 2219 | |
90165123 | 2220 | if (SYMBOLP (form)) |
b9598260 | 2221 | { |
f07a954e SM |
2222 | /* Look up its binding in the lexical environment. |
2223 | We do not pay attention to the declared_special flag here, since we | |
2224 | already did that when let-binding the variable. */ | |
2225 | Lisp_Object lex_binding | |
2226 | = !NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
2227 | ? Fassq (form, Vinternal_interpreter_environment) | |
2228 | : Qnil; | |
2229 | if (CONSP (lex_binding)) | |
2230 | return XCDR (lex_binding); | |
2231 | else | |
2232 | return Fsymbol_value (form); | |
b9598260 SM |
2233 | } |
2234 | ||
db9f0278 JB |
2235 | if (!CONSP (form)) |
2236 | return form; | |
2237 | ||
2238 | QUIT; | |
ee830945 RS |
2239 | if ((consing_since_gc > gc_cons_threshold |
2240 | && consing_since_gc > gc_relative_threshold) | |
2241 | || | |
2242 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2243 | { |
2244 | GCPRO1 (form); | |
2245 | Fgarbage_collect (); | |
2246 | UNGCPRO; | |
2247 | } | |
2248 | ||
2249 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2250 | { | |
2251 | if (max_lisp_eval_depth < 100) | |
2252 | max_lisp_eval_depth = 100; | |
2253 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2254 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2255 | } |
2256 | ||
2257 | original_fun = Fcar (form); | |
2258 | original_args = Fcdr (form); | |
2259 | ||
2260 | backtrace.next = backtrace_list; | |
2261 | backtrace_list = &backtrace; | |
f6d62986 | 2262 | backtrace.function = &original_fun; /* This also protects them from gc. */ |
db9f0278 JB |
2263 | backtrace.args = &original_args; |
2264 | backtrace.nargs = UNEVALLED; | |
db9f0278 JB |
2265 | backtrace.debug_on_exit = 0; |
2266 | ||
2267 | if (debug_on_next_call) | |
2268 | do_debug_on_call (Qt); | |
2269 | ||
2270 | /* At this point, only original_fun and original_args | |
f6d62986 | 2271 | have values that will be used below. */ |
db9f0278 | 2272 | retry: |
8788120f KS |
2273 | |
2274 | /* Optimize for no indirection. */ | |
2275 | fun = original_fun; | |
2276 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2277 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2278 | fun = indirect_function (fun); | |
db9f0278 | 2279 | |
90165123 | 2280 | if (SUBRP (fun)) |
db9f0278 JB |
2281 | { |
2282 | Lisp_Object numargs; | |
166c822d | 2283 | Lisp_Object argvals[8]; |
db9f0278 JB |
2284 | Lisp_Object args_left; |
2285 | register int i, maxargs; | |
2286 | ||
2287 | args_left = original_args; | |
2288 | numargs = Flength (args_left); | |
2289 | ||
c1788fbc RS |
2290 | CHECK_CONS_LIST (); |
2291 | ||
f6d62986 SM |
2292 | if (XINT (numargs) < XSUBR (fun)->min_args |
2293 | || (XSUBR (fun)->max_args >= 0 | |
2294 | && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2295 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2296 | |
ef1b0ba7 | 2297 | else if (XSUBR (fun)->max_args == UNEVALLED) |
bbc6b304 | 2298 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
ef1b0ba7 | 2299 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 | 2300 | { |
f6d62986 | 2301 | /* Pass a vector of evaluated arguments. */ |
db9f0278 | 2302 | Lisp_Object *vals; |
f66c7cf8 | 2303 | ptrdiff_t argnum = 0; |
3a7a9129 | 2304 | USE_SAFE_ALLOCA; |
db9f0278 | 2305 | |
b72e0717 | 2306 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2307 | |
2308 | GCPRO3 (args_left, fun, fun); | |
2309 | gcpro3.var = vals; | |
2310 | gcpro3.nvars = 0; | |
2311 | ||
265a9e55 | 2312 | while (!NILP (args_left)) |
db9f0278 | 2313 | { |
defb1411 | 2314 | vals[argnum++] = eval_sub (Fcar (args_left)); |
db9f0278 JB |
2315 | args_left = Fcdr (args_left); |
2316 | gcpro3.nvars = argnum; | |
2317 | } | |
db9f0278 JB |
2318 | |
2319 | backtrace.args = vals; | |
2320 | backtrace.nargs = XINT (numargs); | |
2321 | ||
d5273788 | 2322 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2323 | UNGCPRO; |
3a7a9129 | 2324 | SAFE_FREE (); |
db9f0278 | 2325 | } |
ef1b0ba7 | 2326 | else |
db9f0278 | 2327 | { |
ef1b0ba7 SM |
2328 | GCPRO3 (args_left, fun, fun); |
2329 | gcpro3.var = argvals; | |
2330 | gcpro3.nvars = 0; | |
db9f0278 | 2331 | |
ef1b0ba7 SM |
2332 | maxargs = XSUBR (fun)->max_args; |
2333 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2334 | { | |
a0ee6f27 | 2335 | argvals[i] = eval_sub (Fcar (args_left)); |
ef1b0ba7 SM |
2336 | gcpro3.nvars = ++i; |
2337 | } | |
db9f0278 | 2338 | |
ef1b0ba7 | 2339 | UNGCPRO; |
db9f0278 | 2340 | |
ef1b0ba7 SM |
2341 | backtrace.args = argvals; |
2342 | backtrace.nargs = XINT (numargs); | |
2343 | ||
2344 | switch (i) | |
2345 | { | |
2346 | case 0: | |
2347 | val = (XSUBR (fun)->function.a0 ()); | |
2348 | break; | |
2349 | case 1: | |
2350 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2351 | break; | |
2352 | case 2: | |
2353 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2354 | break; | |
2355 | case 3: | |
2356 | val = (XSUBR (fun)->function.a3 | |
2357 | (argvals[0], argvals[1], argvals[2])); | |
2358 | break; | |
2359 | case 4: | |
2360 | val = (XSUBR (fun)->function.a4 | |
2361 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2362 | break; | |
2363 | case 5: | |
2364 | val = (XSUBR (fun)->function.a5 | |
2365 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2366 | argvals[4])); | |
2367 | break; | |
2368 | case 6: | |
2369 | val = (XSUBR (fun)->function.a6 | |
2370 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2371 | argvals[4], argvals[5])); | |
2372 | break; | |
2373 | case 7: | |
2374 | val = (XSUBR (fun)->function.a7 | |
2375 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2376 | argvals[4], argvals[5], argvals[6])); | |
2377 | break; | |
2378 | ||
2379 | case 8: | |
2380 | val = (XSUBR (fun)->function.a8 | |
2381 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2382 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2383 | break; | |
2384 | ||
2385 | default: | |
2386 | /* Someone has created a subr that takes more arguments than | |
2387 | is supported by this code. We need to either rewrite the | |
2388 | subr to use a different argument protocol, or add more | |
2389 | cases to this switch. */ | |
2390 | abort (); | |
2391 | } | |
db9f0278 JB |
2392 | } |
2393 | } | |
ef1b0ba7 | 2394 | else if (COMPILEDP (fun)) |
defb1411 | 2395 | val = apply_lambda (fun, original_args); |
db9f0278 JB |
2396 | else |
2397 | { | |
8788120f | 2398 | if (EQ (fun, Qunbound)) |
734d55a2 | 2399 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2400 | if (!CONSP (fun)) |
734d55a2 KS |
2401 | xsignal1 (Qinvalid_function, original_fun); |
2402 | funcar = XCAR (fun); | |
90165123 | 2403 | if (!SYMBOLP (funcar)) |
734d55a2 | 2404 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2405 | if (EQ (funcar, Qautoload)) |
2406 | { | |
2407 | do_autoload (fun, original_fun); | |
2408 | goto retry; | |
2409 | } | |
2410 | if (EQ (funcar, Qmacro)) | |
defb1411 SM |
2411 | val = eval_sub (apply1 (Fcdr (fun), original_args)); |
2412 | else if (EQ (funcar, Qlambda) | |
2413 | || EQ (funcar, Qclosure)) | |
2414 | val = apply_lambda (fun, original_args); | |
db9f0278 | 2415 | else |
734d55a2 | 2416 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2417 | } |
c1788fbc RS |
2418 | CHECK_CONS_LIST (); |
2419 | ||
db9f0278 JB |
2420 | lisp_eval_depth--; |
2421 | if (backtrace.debug_on_exit) | |
2422 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2423 | backtrace_list = backtrace.next; | |
824eb35e | 2424 | |
db9f0278 JB |
2425 | return val; |
2426 | } | |
2427 | \f | |
a7ca3326 | 2428 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, |
9dbc9081 PJ |
2429 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2430 | Then return the value FUNCTION returns. | |
2431 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2432 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2433 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2434 | { |
f66c7cf8 | 2435 | ptrdiff_t i, numargs; |
db9f0278 JB |
2436 | register Lisp_Object spread_arg; |
2437 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2438 | Lisp_Object fun, retval; |
96d44c64 | 2439 | struct gcpro gcpro1; |
3a7a9129 | 2440 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2441 | |
2442 | fun = args [0]; | |
2443 | funcall_args = 0; | |
2444 | spread_arg = args [nargs - 1]; | |
b7826503 | 2445 | CHECK_LIST (spread_arg); |
177c0ea7 | 2446 | |
db9f0278 JB |
2447 | numargs = XINT (Flength (spread_arg)); |
2448 | ||
2449 | if (numargs == 0) | |
2450 | return Ffuncall (nargs - 1, args); | |
2451 | else if (numargs == 1) | |
2452 | { | |
03699b14 | 2453 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2454 | return Ffuncall (nargs, args); |
2455 | } | |
2456 | ||
a6e3fa71 | 2457 | numargs += nargs - 2; |
db9f0278 | 2458 | |
8788120f KS |
2459 | /* Optimize for no indirection. */ |
2460 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2461 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2462 | fun = indirect_function (fun); | |
ffd56f97 | 2463 | if (EQ (fun, Qunbound)) |
db9f0278 | 2464 | { |
f6d62986 | 2465 | /* Let funcall get the error. */ |
ffd56f97 JB |
2466 | fun = args[0]; |
2467 | goto funcall; | |
db9f0278 JB |
2468 | } |
2469 | ||
90165123 | 2470 | if (SUBRP (fun)) |
db9f0278 JB |
2471 | { |
2472 | if (numargs < XSUBR (fun)->min_args | |
2473 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
f6d62986 | 2474 | goto funcall; /* Let funcall get the error. */ |
c5101a77 | 2475 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2476 | { |
2477 | /* Avoid making funcall cons up a yet another new vector of arguments | |
f6d62986 | 2478 | by explicitly supplying nil's for optional values. */ |
b72e0717 | 2479 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2480 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2481 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2482 | GCPRO1 (*funcall_args); |
2483 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2484 | } |
2485 | } | |
2486 | funcall: | |
2487 | /* We add 1 to numargs because funcall_args includes the | |
2488 | function itself as well as its arguments. */ | |
2489 | if (!funcall_args) | |
a6e3fa71 | 2490 | { |
b72e0717 | 2491 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2492 | GCPRO1 (*funcall_args); |
2493 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2494 | } |
2495 | ||
72af86bd | 2496 | memcpy (funcall_args, args, nargs * sizeof (Lisp_Object)); |
db9f0278 JB |
2497 | /* Spread the last arg we got. Its first element goes in |
2498 | the slot that it used to occupy, hence this value of I. */ | |
2499 | i = nargs - 1; | |
265a9e55 | 2500 | while (!NILP (spread_arg)) |
db9f0278 | 2501 | { |
03699b14 KR |
2502 | funcall_args [i++] = XCAR (spread_arg); |
2503 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2504 | } |
a6e3fa71 | 2505 | |
96d44c64 | 2506 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2507 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2508 | UNGCPRO; | |
2509 | SAFE_FREE (); | |
2510 | ||
2511 | return retval; | |
db9f0278 JB |
2512 | } |
2513 | \f | |
ff936e53 SM |
2514 | /* Run hook variables in various ways. */ |
2515 | ||
f6d62986 | 2516 | static Lisp_Object |
f66c7cf8 | 2517 | funcall_nil (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2518 | { |
2519 | Ffuncall (nargs, args); | |
2520 | return Qnil; | |
2521 | } | |
ff936e53 | 2522 | |
a7ca3326 | 2523 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2524 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2525 | Each argument should be a symbol, a hook variable. |
2526 | These symbols are processed in the order specified. | |
2527 | If a hook symbol has a non-nil value, that value may be a function | |
2528 | or a list of functions to be called to run the hook. | |
2529 | If the value is a function, it is called with no arguments. | |
2530 | If it is a list, the elements are called, in order, with no arguments. | |
2531 | ||
9f685258 LK |
2532 | Major modes should not use this function directly to run their mode |
2533 | hook; they should use `run-mode-hooks' instead. | |
2534 | ||
72e85d5d RS |
2535 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2536 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2537 | usage: (run-hooks &rest HOOKS) */) |
f66c7cf8 | 2538 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 SM |
2539 | { |
2540 | Lisp_Object hook[1]; | |
f66c7cf8 | 2541 | ptrdiff_t i; |
ff936e53 SM |
2542 | |
2543 | for (i = 0; i < nargs; i++) | |
2544 | { | |
2545 | hook[0] = args[i]; | |
f6d62986 | 2546 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
2547 | } |
2548 | ||
2549 | return Qnil; | |
2550 | } | |
177c0ea7 | 2551 | |
a7ca3326 | 2552 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2553 | Srun_hook_with_args, 1, MANY, 0, |
2554 | doc: /* Run HOOK with the specified arguments ARGS. | |
2555 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2556 | value, that value may be a function or a list of functions to be | |
2557 | called to run the hook. If the value is a function, it is called with | |
2558 | the given arguments and its return value is returned. If it is a list | |
2559 | of functions, those functions are called, in order, | |
2560 | with the given arguments ARGS. | |
d5e2c90c | 2561 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2562 | as that may change. |
2563 | ||
72e85d5d RS |
2564 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2565 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2566 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
f66c7cf8 | 2567 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2568 | { |
f6d62986 | 2569 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
2570 | } |
2571 | ||
a0d76c27 | 2572 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2573 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2574 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2575 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2576 | value, that value may be a function or a list of functions to be | |
2577 | called to run the hook. If the value is a function, it is called with | |
2578 | the given arguments and its return value is returned. | |
2579 | If it is a list of functions, those functions are called, in order, | |
2580 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2581 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2582 | However, if they all return nil, we return nil. |
9dbc9081 | 2583 | |
72e85d5d RS |
2584 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2585 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2586 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
f66c7cf8 | 2587 | (ptrdiff_t nargs, Lisp_Object *args) |
b0b667cb | 2588 | { |
f6d62986 SM |
2589 | return run_hook_with_args (nargs, args, Ffuncall); |
2590 | } | |
2591 | ||
2592 | static Lisp_Object | |
f66c7cf8 | 2593 | funcall_not (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2594 | { |
2595 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
2596 | } |
2597 | ||
a7ca3326 | 2598 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2599 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2600 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2601 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2602 | value, that value may be a function or a list of functions to be | |
2603 | called to run the hook. If the value is a function, it is called with | |
2604 | the given arguments and its return value is returned. | |
2605 | If it is a list of functions, those functions are called, in order, | |
2606 | with the given arguments ARGS, until one of them returns nil. | |
2607 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2608 | |
72e85d5d RS |
2609 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2610 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2611 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
f66c7cf8 | 2612 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2613 | { |
f6d62986 | 2614 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
2615 | } |
2616 | ||
f6d62986 | 2617 | static Lisp_Object |
f66c7cf8 | 2618 | run_hook_wrapped_funcall (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2619 | { |
2620 | Lisp_Object tmp = args[0], ret; | |
2621 | args[0] = args[1]; | |
2622 | args[1] = tmp; | |
2623 | ret = Ffuncall (nargs, args); | |
2624 | args[1] = args[0]; | |
2625 | args[0] = tmp; | |
2626 | return ret; | |
2627 | } | |
2628 | ||
2629 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
2630 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
2631 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
2632 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
2633 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
2634 | aborts and returns that value. | |
2635 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
f66c7cf8 | 2636 | (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2637 | { |
2638 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
2639 | } | |
ff936e53 | 2640 | |
c933ea05 RS |
2641 | /* ARGS[0] should be a hook symbol. |
2642 | Call each of the functions in the hook value, passing each of them | |
2643 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 2644 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
2645 | The caller (or its caller, etc) must gcpro all of ARGS, |
2646 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2647 | ||
f6d62986 | 2648 | Lisp_Object |
f66c7cf8 PE |
2649 | run_hook_with_args (ptrdiff_t nargs, Lisp_Object *args, |
2650 | Lisp_Object (*funcall) (ptrdiff_t nargs, Lisp_Object *args)) | |
ff936e53 | 2651 | { |
f6d62986 | 2652 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 2653 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2654 | |
f029ca5f RS |
2655 | /* If we are dying or still initializing, |
2656 | don't do anything--it would probably crash if we tried. */ | |
2657 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2658 | return Qnil; |
f029ca5f | 2659 | |
b0b667cb | 2660 | sym = args[0]; |
aa681b51 | 2661 | val = find_symbol_value (sym); |
ff936e53 | 2662 | |
b0b667cb | 2663 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2664 | return ret; |
03699b14 | 2665 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2666 | { |
2667 | args[0] = val; | |
f6d62986 | 2668 | return funcall (nargs, args); |
b0b667cb KH |
2669 | } |
2670 | else | |
2671 | { | |
1faed8ae PE |
2672 | Lisp_Object global_vals = Qnil; |
2673 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2674 | |
ff936e53 | 2675 | for (; |
f6d62986 | 2676 | CONSP (val) && NILP (ret); |
03699b14 | 2677 | val = XCDR (val)) |
b0b667cb | 2678 | { |
03699b14 | 2679 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2680 | { |
2681 | /* t indicates this hook has a local binding; | |
2682 | it means to run the global binding too. */ | |
1faed8ae PE |
2683 | global_vals = Fdefault_value (sym); |
2684 | if (NILP (global_vals)) continue; | |
b0b667cb | 2685 | |
1faed8ae | 2686 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2687 | { |
1faed8ae | 2688 | args[0] = global_vals; |
f6d62986 | 2689 | ret = funcall (nargs, args); |
8932b1c2 CY |
2690 | } |
2691 | else | |
2692 | { | |
2693 | for (; | |
f6d62986 | 2694 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 2695 | global_vals = XCDR (global_vals)) |
8932b1c2 | 2696 | { |
1faed8ae | 2697 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2698 | /* In a global value, t should not occur. If it does, we |
2699 | must ignore it to avoid an endless loop. */ | |
2700 | if (!EQ (args[0], Qt)) | |
f6d62986 | 2701 | ret = funcall (nargs, args); |
8932b1c2 | 2702 | } |
b0b667cb KH |
2703 | } |
2704 | } | |
2705 | else | |
2706 | { | |
03699b14 | 2707 | args[0] = XCAR (val); |
f6d62986 | 2708 | ret = funcall (nargs, args); |
b0b667cb KH |
2709 | } |
2710 | } | |
cb9d21f8 RS |
2711 | |
2712 | UNGCPRO; | |
ff936e53 | 2713 | return ret; |
b0b667cb KH |
2714 | } |
2715 | } | |
c933ea05 | 2716 | |
7d48558f RS |
2717 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2718 | ||
2719 | void | |
d3da34e0 | 2720 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2721 | { |
2722 | Lisp_Object temp[3]; | |
2723 | temp[0] = hook; | |
2724 | temp[1] = arg1; | |
2725 | temp[2] = arg2; | |
2726 | ||
2727 | Frun_hook_with_args (3, temp); | |
2728 | } | |
ff936e53 | 2729 | \f |
f6d62986 | 2730 | /* Apply fn to arg. */ |
db9f0278 | 2731 | Lisp_Object |
d3da34e0 | 2732 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2733 | { |
a6e3fa71 JB |
2734 | struct gcpro gcpro1; |
2735 | ||
2736 | GCPRO1 (fn); | |
265a9e55 | 2737 | if (NILP (arg)) |
a6e3fa71 JB |
2738 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2739 | gcpro1.nvars = 2; | |
db9f0278 JB |
2740 | { |
2741 | Lisp_Object args[2]; | |
2742 | args[0] = fn; | |
2743 | args[1] = arg; | |
a6e3fa71 JB |
2744 | gcpro1.var = args; |
2745 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2746 | } |
db9f0278 JB |
2747 | } |
2748 | ||
f6d62986 | 2749 | /* Call function fn on no arguments. */ |
db9f0278 | 2750 | Lisp_Object |
d3da34e0 | 2751 | call0 (Lisp_Object fn) |
db9f0278 | 2752 | { |
a6e3fa71 JB |
2753 | struct gcpro gcpro1; |
2754 | ||
2755 | GCPRO1 (fn); | |
2756 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2757 | } |
2758 | ||
f6d62986 | 2759 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
2760 | /* ARGSUSED */ |
2761 | Lisp_Object | |
d3da34e0 | 2762 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2763 | { |
a6e3fa71 | 2764 | struct gcpro gcpro1; |
177c0ea7 | 2765 | Lisp_Object args[2]; |
a6e3fa71 | 2766 | |
db9f0278 | 2767 | args[0] = fn; |
15285f9f | 2768 | args[1] = arg1; |
a6e3fa71 JB |
2769 | GCPRO1 (args[0]); |
2770 | gcpro1.nvars = 2; | |
2771 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2772 | } |
2773 | ||
f6d62986 | 2774 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
2775 | /* ARGSUSED */ |
2776 | Lisp_Object | |
d3da34e0 | 2777 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2778 | { |
a6e3fa71 | 2779 | struct gcpro gcpro1; |
db9f0278 JB |
2780 | Lisp_Object args[3]; |
2781 | args[0] = fn; | |
15285f9f RS |
2782 | args[1] = arg1; |
2783 | args[2] = arg2; | |
a6e3fa71 JB |
2784 | GCPRO1 (args[0]); |
2785 | gcpro1.nvars = 3; | |
2786 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2787 | } |
2788 | ||
f6d62986 | 2789 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
2790 | /* ARGSUSED */ |
2791 | Lisp_Object | |
d3da34e0 | 2792 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2793 | { |
a6e3fa71 | 2794 | struct gcpro gcpro1; |
db9f0278 JB |
2795 | Lisp_Object args[4]; |
2796 | args[0] = fn; | |
15285f9f RS |
2797 | args[1] = arg1; |
2798 | args[2] = arg2; | |
2799 | args[3] = arg3; | |
a6e3fa71 JB |
2800 | GCPRO1 (args[0]); |
2801 | gcpro1.nvars = 4; | |
2802 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2803 | } |
2804 | ||
f6d62986 | 2805 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
2806 | /* ARGSUSED */ |
2807 | Lisp_Object | |
d3da34e0 JB |
2808 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2809 | Lisp_Object arg4) | |
a5a44b91 JB |
2810 | { |
2811 | struct gcpro gcpro1; | |
a5a44b91 JB |
2812 | Lisp_Object args[5]; |
2813 | args[0] = fn; | |
15285f9f RS |
2814 | args[1] = arg1; |
2815 | args[2] = arg2; | |
2816 | args[3] = arg3; | |
2817 | args[4] = arg4; | |
a5a44b91 JB |
2818 | GCPRO1 (args[0]); |
2819 | gcpro1.nvars = 5; | |
2820 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2821 | } |
2822 | ||
f6d62986 | 2823 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
2824 | /* ARGSUSED */ |
2825 | Lisp_Object | |
d3da34e0 JB |
2826 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2827 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2828 | { |
2829 | struct gcpro gcpro1; | |
15285f9f RS |
2830 | Lisp_Object args[6]; |
2831 | args[0] = fn; | |
2832 | args[1] = arg1; | |
2833 | args[2] = arg2; | |
2834 | args[3] = arg3; | |
2835 | args[4] = arg4; | |
2836 | args[5] = arg5; | |
2837 | GCPRO1 (args[0]); | |
2838 | gcpro1.nvars = 6; | |
2839 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2840 | } |
2841 | ||
f6d62986 | 2842 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
2843 | /* ARGSUSED */ |
2844 | Lisp_Object | |
d3da34e0 JB |
2845 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2846 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2847 | { |
2848 | struct gcpro gcpro1; | |
15285f9f RS |
2849 | Lisp_Object args[7]; |
2850 | args[0] = fn; | |
2851 | args[1] = arg1; | |
2852 | args[2] = arg2; | |
2853 | args[3] = arg3; | |
2854 | args[4] = arg4; | |
2855 | args[5] = arg5; | |
2856 | args[6] = arg6; | |
2857 | GCPRO1 (args[0]); | |
2858 | gcpro1.nvars = 7; | |
2859 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2860 | } |
2861 | ||
f6d62986 | 2862 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
2863 | /* ARGSUSED */ |
2864 | Lisp_Object | |
d3da34e0 JB |
2865 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2866 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2867 | { |
2868 | struct gcpro gcpro1; | |
574c05e2 KK |
2869 | Lisp_Object args[8]; |
2870 | args[0] = fn; | |
2871 | args[1] = arg1; | |
2872 | args[2] = arg2; | |
2873 | args[3] = arg3; | |
2874 | args[4] = arg4; | |
2875 | args[5] = arg5; | |
2876 | args[6] = arg6; | |
2877 | args[7] = arg7; | |
2878 | GCPRO1 (args[0]); | |
2879 | gcpro1.nvars = 8; | |
2880 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2881 | } |
2882 | ||
6c2ef893 RS |
2883 | /* The caller should GCPRO all the elements of ARGS. */ |
2884 | ||
a7ca3326 | 2885 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 2886 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 2887 | (Lisp_Object object) |
b9598260 SM |
2888 | { |
2889 | if (SYMBOLP (object) && !NILP (Ffboundp (object))) | |
2890 | { | |
ba83908c | 2891 | object = Findirect_function (object, Qt); |
b9598260 SM |
2892 | |
2893 | if (CONSP (object) && EQ (XCAR (object), Qautoload)) | |
2894 | { | |
2895 | /* Autoloaded symbols are functions, except if they load | |
2896 | macros or keymaps. */ | |
2897 | int i; | |
2898 | for (i = 0; i < 4 && CONSP (object); i++) | |
2899 | object = XCDR (object); | |
2900 | ||
2901 | return (CONSP (object) && !NILP (XCAR (object))) ? Qnil : Qt; | |
2902 | } | |
2903 | } | |
2904 | ||
2905 | if (SUBRP (object)) | |
3c3ddb98 | 2906 | return (XSUBR (object)->max_args != UNEVALLED) ? Qt : Qnil; |
876c194c | 2907 | else if (COMPILEDP (object)) |
b9598260 SM |
2908 | return Qt; |
2909 | else if (CONSP (object)) | |
2910 | { | |
2911 | Lisp_Object car = XCAR (object); | |
2912 | return (EQ (car, Qlambda) || EQ (car, Qclosure)) ? Qt : Qnil; | |
2913 | } | |
2914 | else | |
2915 | return Qnil; | |
2916 | } | |
2917 | ||
a7ca3326 | 2918 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2919 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2920 | Return the value that function returns. | |
2921 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2922 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2923 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2924 | { |
8788120f | 2925 | Lisp_Object fun, original_fun; |
db9f0278 | 2926 | Lisp_Object funcar; |
f66c7cf8 | 2927 | ptrdiff_t numargs = nargs - 1; |
db9f0278 JB |
2928 | Lisp_Object lisp_numargs; |
2929 | Lisp_Object val; | |
2930 | struct backtrace backtrace; | |
2931 | register Lisp_Object *internal_args; | |
f66c7cf8 | 2932 | ptrdiff_t i; |
db9f0278 JB |
2933 | |
2934 | QUIT; | |
ee830945 RS |
2935 | if ((consing_since_gc > gc_cons_threshold |
2936 | && consing_since_gc > gc_relative_threshold) | |
2937 | || | |
2938 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 2939 | Fgarbage_collect (); |
db9f0278 JB |
2940 | |
2941 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2942 | { | |
2943 | if (max_lisp_eval_depth < 100) | |
2944 | max_lisp_eval_depth = 100; | |
2945 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2946 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2947 | } |
2948 | ||
2949 | backtrace.next = backtrace_list; | |
2950 | backtrace_list = &backtrace; | |
2951 | backtrace.function = &args[0]; | |
2952 | backtrace.args = &args[1]; | |
2953 | backtrace.nargs = nargs - 1; | |
db9f0278 JB |
2954 | backtrace.debug_on_exit = 0; |
2955 | ||
2956 | if (debug_on_next_call) | |
2957 | do_debug_on_call (Qlambda); | |
2958 | ||
fff3ff9c KS |
2959 | CHECK_CONS_LIST (); |
2960 | ||
8788120f KS |
2961 | original_fun = args[0]; |
2962 | ||
db9f0278 JB |
2963 | retry: |
2964 | ||
8788120f KS |
2965 | /* Optimize for no indirection. */ |
2966 | fun = original_fun; | |
2967 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2968 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2969 | fun = indirect_function (fun); | |
db9f0278 | 2970 | |
90165123 | 2971 | if (SUBRP (fun)) |
db9f0278 | 2972 | { |
ef1b0ba7 | 2973 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
2974 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
2975 | { | |
a631e24c | 2976 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 2977 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
2978 | } |
2979 | ||
ef1b0ba7 | 2980 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 2981 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2982 | |
ef1b0ba7 SM |
2983 | else if (XSUBR (fun)->max_args == MANY) |
2984 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 2985 | else |
db9f0278 | 2986 | { |
ef1b0ba7 SM |
2987 | if (XSUBR (fun)->max_args > numargs) |
2988 | { | |
2989 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
2990 | memcpy (internal_args, args + 1, numargs * sizeof (Lisp_Object)); | |
2991 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
2992 | internal_args[i] = Qnil; | |
2993 | } | |
2994 | else | |
2995 | internal_args = args + 1; | |
2996 | switch (XSUBR (fun)->max_args) | |
2997 | { | |
2998 | case 0: | |
2999 | val = (XSUBR (fun)->function.a0 ()); | |
3000 | break; | |
3001 | case 1: | |
3002 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
3003 | break; | |
3004 | case 2: | |
3005 | val = (XSUBR (fun)->function.a2 | |
3006 | (internal_args[0], internal_args[1])); | |
3007 | break; | |
3008 | case 3: | |
3009 | val = (XSUBR (fun)->function.a3 | |
3010 | (internal_args[0], internal_args[1], internal_args[2])); | |
3011 | break; | |
3012 | case 4: | |
3013 | val = (XSUBR (fun)->function.a4 | |
3014 | (internal_args[0], internal_args[1], internal_args[2], | |
3015 | internal_args[3])); | |
3016 | break; | |
3017 | case 5: | |
3018 | val = (XSUBR (fun)->function.a5 | |
3019 | (internal_args[0], internal_args[1], internal_args[2], | |
3020 | internal_args[3], internal_args[4])); | |
3021 | break; | |
3022 | case 6: | |
3023 | val = (XSUBR (fun)->function.a6 | |
3024 | (internal_args[0], internal_args[1], internal_args[2], | |
3025 | internal_args[3], internal_args[4], internal_args[5])); | |
3026 | break; | |
3027 | case 7: | |
3028 | val = (XSUBR (fun)->function.a7 | |
3029 | (internal_args[0], internal_args[1], internal_args[2], | |
3030 | internal_args[3], internal_args[4], internal_args[5], | |
3031 | internal_args[6])); | |
3032 | break; | |
3033 | ||
3034 | case 8: | |
3035 | val = (XSUBR (fun)->function.a8 | |
3036 | (internal_args[0], internal_args[1], internal_args[2], | |
3037 | internal_args[3], internal_args[4], internal_args[5], | |
3038 | internal_args[6], internal_args[7])); | |
3039 | break; | |
3040 | ||
3041 | default: | |
3042 | ||
3043 | /* If a subr takes more than 8 arguments without using MANY | |
3044 | or UNEVALLED, we need to extend this function to support it. | |
3045 | Until this is done, there is no way to call the function. */ | |
3046 | abort (); | |
3047 | } | |
db9f0278 JB |
3048 | } |
3049 | } | |
ef1b0ba7 | 3050 | else if (COMPILEDP (fun)) |
db9f0278 JB |
3051 | val = funcall_lambda (fun, numargs, args + 1); |
3052 | else | |
3053 | { | |
8788120f | 3054 | if (EQ (fun, Qunbound)) |
734d55a2 | 3055 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 3056 | if (!CONSP (fun)) |
734d55a2 KS |
3057 | xsignal1 (Qinvalid_function, original_fun); |
3058 | funcar = XCAR (fun); | |
90165123 | 3059 | if (!SYMBOLP (funcar)) |
734d55a2 | 3060 | xsignal1 (Qinvalid_function, original_fun); |
defb1411 SM |
3061 | if (EQ (funcar, Qlambda) |
3062 | || EQ (funcar, Qclosure)) | |
db9f0278 | 3063 | val = funcall_lambda (fun, numargs, args + 1); |
db9f0278 JB |
3064 | else if (EQ (funcar, Qautoload)) |
3065 | { | |
8788120f | 3066 | do_autoload (fun, original_fun); |
fff3ff9c | 3067 | CHECK_CONS_LIST (); |
db9f0278 JB |
3068 | goto retry; |
3069 | } | |
3070 | else | |
734d55a2 | 3071 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 3072 | } |
c1788fbc | 3073 | CHECK_CONS_LIST (); |
db9f0278 JB |
3074 | lisp_eval_depth--; |
3075 | if (backtrace.debug_on_exit) | |
3076 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
3077 | backtrace_list = backtrace.next; | |
3078 | return val; | |
3079 | } | |
3080 | \f | |
2f7c71a1 | 3081 | static Lisp_Object |
defb1411 | 3082 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
3083 | { |
3084 | Lisp_Object args_left; | |
f66c7cf8 | 3085 | ptrdiff_t i, numargs; |
db9f0278 JB |
3086 | register Lisp_Object *arg_vector; |
3087 | struct gcpro gcpro1, gcpro2, gcpro3; | |
db9f0278 | 3088 | register Lisp_Object tem; |
3a7a9129 | 3089 | USE_SAFE_ALLOCA; |
db9f0278 | 3090 | |
f66c7cf8 | 3091 | numargs = XFASTINT (Flength (args)); |
c5101a77 | 3092 | SAFE_ALLOCA_LISP (arg_vector, numargs); |
db9f0278 JB |
3093 | args_left = args; |
3094 | ||
3095 | GCPRO3 (*arg_vector, args_left, fun); | |
3096 | gcpro1.nvars = 0; | |
3097 | ||
c5101a77 | 3098 | for (i = 0; i < numargs; ) |
db9f0278 JB |
3099 | { |
3100 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
defb1411 | 3101 | tem = eval_sub (tem); |
db9f0278 JB |
3102 | arg_vector[i++] = tem; |
3103 | gcpro1.nvars = i; | |
3104 | } | |
3105 | ||
3106 | UNGCPRO; | |
3107 | ||
f07a954e SM |
3108 | backtrace_list->args = arg_vector; |
3109 | backtrace_list->nargs = i; | |
c5101a77 | 3110 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
3111 | |
3112 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3113 | if (backtrace_list->debug_on_exit) | |
3114 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3115 | /* Don't do it again when we return to eval. */ | |
3116 | backtrace_list->debug_on_exit = 0; | |
3a7a9129 | 3117 | SAFE_FREE (); |
db9f0278 JB |
3118 | return tem; |
3119 | } | |
3120 | ||
3121 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
3122 | and return the result of evaluation. | |
3123 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3124 | ||
2901f1d1 | 3125 | static Lisp_Object |
f66c7cf8 | 3126 | funcall_lambda (Lisp_Object fun, ptrdiff_t nargs, |
c5101a77 | 3127 | register Lisp_Object *arg_vector) |
db9f0278 | 3128 | { |
defb1411 | 3129 | Lisp_Object val, syms_left, next, lexenv; |
aed13378 | 3130 | int count = SPECPDL_INDEX (); |
f66c7cf8 | 3131 | ptrdiff_t i; |
c5101a77 | 3132 | int optional, rest; |
db9f0278 | 3133 | |
90165123 | 3134 | if (CONSP (fun)) |
9ab90667 | 3135 | { |
defb1411 SM |
3136 | if (EQ (XCAR (fun), Qclosure)) |
3137 | { | |
3138 | fun = XCDR (fun); /* Drop `closure'. */ | |
3139 | lexenv = XCAR (fun); | |
23aba0ea | 3140 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
3141 | } |
3142 | else | |
3143 | lexenv = Qnil; | |
9ab90667 GM |
3144 | syms_left = XCDR (fun); |
3145 | if (CONSP (syms_left)) | |
3146 | syms_left = XCAR (syms_left); | |
3147 | else | |
734d55a2 | 3148 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3149 | } |
90165123 | 3150 | else if (COMPILEDP (fun)) |
defb1411 | 3151 | { |
798cb644 SM |
3152 | syms_left = AREF (fun, COMPILED_ARGLIST); |
3153 | if (INTEGERP (syms_left)) | |
876c194c SM |
3154 | /* A byte-code object with a non-nil `push args' slot means we |
3155 | shouldn't bind any arguments, instead just call the byte-code | |
3156 | interpreter directly; it will push arguments as necessary. | |
3157 | ||
9173deec | 3158 | Byte-code objects with either a non-existent, or a nil value for |
876c194c SM |
3159 | the `push args' slot (the default), have dynamically-bound |
3160 | arguments, and use the argument-binding code below instead (as do | |
3161 | all interpreted functions, even lexically bound ones). */ | |
3162 | { | |
3163 | /* If we have not actually read the bytecode string | |
3164 | and constants vector yet, fetch them from the file. */ | |
3165 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
3166 | Ffetch_bytecode (fun); | |
3167 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
3168 | AREF (fun, COMPILED_CONSTANTS), | |
3169 | AREF (fun, COMPILED_STACK_DEPTH), | |
798cb644 | 3170 | syms_left, |
876c194c SM |
3171 | nargs, arg_vector); |
3172 | } | |
defb1411 SM |
3173 | lexenv = Qnil; |
3174 | } | |
9ab90667 GM |
3175 | else |
3176 | abort (); | |
db9f0278 | 3177 | |
9ab90667 GM |
3178 | i = optional = rest = 0; |
3179 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3180 | { |
3181 | QUIT; | |
177c0ea7 | 3182 | |
9ab90667 | 3183 | next = XCAR (syms_left); |
8788120f | 3184 | if (!SYMBOLP (next)) |
734d55a2 | 3185 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3186 | |
db9f0278 JB |
3187 | if (EQ (next, Qand_rest)) |
3188 | rest = 1; | |
3189 | else if (EQ (next, Qand_optional)) | |
3190 | optional = 1; | |
db9f0278 | 3191 | else |
db9f0278 | 3192 | { |
e610eaca | 3193 | Lisp_Object arg; |
defb1411 SM |
3194 | if (rest) |
3195 | { | |
e610eaca | 3196 | arg = Flist (nargs - i, &arg_vector[i]); |
defb1411 SM |
3197 | i = nargs; |
3198 | } | |
3199 | else if (i < nargs) | |
e610eaca | 3200 | arg = arg_vector[i++]; |
b9598260 SM |
3201 | else if (!optional) |
3202 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3203 | else | |
e610eaca | 3204 | arg = Qnil; |
7200d79c | 3205 | |
b9598260 | 3206 | /* Bind the argument. */ |
876c194c | 3207 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 | 3208 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
e610eaca | 3209 | lexenv = Fcons (Fcons (next, arg), lexenv); |
b9598260 SM |
3210 | else |
3211 | /* Dynamically bind NEXT. */ | |
e610eaca | 3212 | specbind (next, arg); |
db9f0278 | 3213 | } |
db9f0278 JB |
3214 | } |
3215 | ||
9ab90667 | 3216 | if (!NILP (syms_left)) |
734d55a2 | 3217 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3218 | else if (i < nargs) |
734d55a2 | 3219 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3220 | |
b9598260 SM |
3221 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3222 | /* Instantiate a new lexical environment. */ | |
3223 | specbind (Qinternal_interpreter_environment, lexenv); | |
3224 | ||
90165123 | 3225 | if (CONSP (fun)) |
9ab90667 | 3226 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3227 | else |
ca248607 RS |
3228 | { |
3229 | /* If we have not actually read the bytecode string | |
3230 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3231 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3232 | Ffetch_bytecode (fun); |
b9598260 SM |
3233 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3234 | AREF (fun, COMPILED_CONSTANTS), | |
3235 | AREF (fun, COMPILED_STACK_DEPTH), | |
3236 | Qnil, 0, 0); | |
ca248607 | 3237 | } |
177c0ea7 | 3238 | |
db9f0278 JB |
3239 | return unbind_to (count, val); |
3240 | } | |
661c7d6e KH |
3241 | |
3242 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3243 | 1, 1, 0, |
3244 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3245 | (Lisp_Object object) |
661c7d6e KH |
3246 | { |
3247 | Lisp_Object tem; | |
3248 | ||
845975f5 | 3249 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3250 | { |
845975f5 | 3251 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3252 | if (!CONSP (tem)) |
845975f5 SM |
3253 | { |
3254 | tem = AREF (object, COMPILED_BYTECODE); | |
3255 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3256 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3257 | else |
3258 | error ("Invalid byte code"); | |
3259 | } | |
3ae565b3 SM |
3260 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3261 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3262 | } |
3263 | return object; | |
3264 | } | |
db9f0278 | 3265 | \f |
475545b5 | 3266 | static void |
d3da34e0 | 3267 | grow_specpdl (void) |
db9f0278 | 3268 | { |
aed13378 | 3269 | register int count = SPECPDL_INDEX (); |
98e8eae1 PE |
3270 | int max_size = |
3271 | min (max_specpdl_size, | |
3272 | min (max (PTRDIFF_MAX, SIZE_MAX) / sizeof (struct specbinding), | |
3273 | INT_MAX)); | |
3274 | int size; | |
3275 | if (max_size <= specpdl_size) | |
db9f0278 JB |
3276 | { |
3277 | if (max_specpdl_size < 400) | |
98e8eae1 PE |
3278 | max_size = max_specpdl_size = 400; |
3279 | if (max_size <= specpdl_size) | |
734d55a2 | 3280 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 | 3281 | } |
98e8eae1 | 3282 | size = specpdl_size < max_size / 2 ? 2 * specpdl_size : max_size; |
0065d054 | 3283 | specpdl = xnrealloc (specpdl, size, sizeof *specpdl); |
98e8eae1 | 3284 | specpdl_size = size; |
db9f0278 JB |
3285 | specpdl_ptr = specpdl + count; |
3286 | } | |
3287 | ||
f6d62986 | 3288 | /* `specpdl_ptr->symbol' is a field which describes which variable is |
4e2db1fe SM |
3289 | let-bound, so it can be properly undone when we unbind_to. |
3290 | It can have the following two shapes: | |
3291 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3292 | a symbol that is not buffer-local (at least at the time | |
3293 | the let binding started). Note also that it should not be | |
3294 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3295 | to record V2 here). | |
3296 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3297 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3298 | which buffer is affected (or nil if the let-binding affects the | |
3299 | global value of the variable) and BUFFER tells us which buffer was | |
3300 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3301 | BUFFER did not yet have a buffer-local value). */ | |
3302 | ||
db9f0278 | 3303 | void |
d3da34e0 | 3304 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3305 | { |
ce5b453a SM |
3306 | struct Lisp_Symbol *sym; |
3307 | ||
3308 | eassert (!handling_signal); | |
db9f0278 | 3309 | |
b7826503 | 3310 | CHECK_SYMBOL (symbol); |
ce5b453a | 3311 | sym = XSYMBOL (symbol); |
db9f0278 JB |
3312 | if (specpdl_ptr == specpdl + specpdl_size) |
3313 | grow_specpdl (); | |
719177b3 | 3314 | |
ce5b453a SM |
3315 | start: |
3316 | switch (sym->redirect) | |
719177b3 | 3317 | { |
ce5b453a SM |
3318 | case SYMBOL_VARALIAS: |
3319 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3320 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3321 | /* The most common case is that of a non-constant symbol with a |
3322 | trivial value. Make that as fast as we can. */ | |
3323 | specpdl_ptr->symbol = symbol; | |
3324 | specpdl_ptr->old_value = SYMBOL_VAL (sym); | |
3325 | specpdl_ptr->func = NULL; | |
3326 | ++specpdl_ptr; | |
3327 | if (!sym->constant) | |
3328 | SET_SYMBOL_VAL (sym, value); | |
3329 | else | |
3330 | set_internal (symbol, value, Qnil, 1); | |
3331 | break; | |
4e2db1fe SM |
3332 | case SYMBOL_LOCALIZED: |
3333 | if (SYMBOL_BLV (sym)->frame_local) | |
3334 | error ("Frame-local vars cannot be let-bound"); | |
3335 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3336 | { |
3337 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3338 | specpdl_ptr->func = 0; | |
3339 | specpdl_ptr->old_value = ovalue; | |
3340 | ||
3341 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3342 | || (EQ (SYMBOL_BLV (sym)->where, | |
3343 | SYMBOL_BLV (sym)->frame_local ? | |
3344 | Fselected_frame () : Fcurrent_buffer ()))); | |
3345 | ||
3346 | if (sym->redirect == SYMBOL_LOCALIZED | |
3347 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3348 | { | |
3349 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3350 | ||
3351 | /* For a local variable, record both the symbol and which | |
3352 | buffer's or frame's value we are saving. */ | |
3353 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3354 | { | |
3355 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3356 | || (BLV_FOUND (SYMBOL_BLV (sym)) | |
3357 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); | |
3358 | where = cur_buf; | |
3359 | } | |
3360 | else if (sym->redirect == SYMBOL_LOCALIZED | |
3361 | && BLV_FOUND (SYMBOL_BLV (sym))) | |
3362 | where = SYMBOL_BLV (sym)->where; | |
3363 | else | |
3364 | where = Qnil; | |
3365 | ||
3366 | /* We're not using the `unused' slot in the specbinding | |
3367 | structure because this would mean we have to do more | |
3368 | work for simple variables. */ | |
3369 | /* FIXME: The third value `current_buffer' is only used in | |
3370 | let_shadows_buffer_binding_p which is itself only used | |
3371 | in set_internal for local_if_set. */ | |
4e2db1fe | 3372 | eassert (NILP (where) || EQ (where, cur_buf)); |
ce5b453a SM |
3373 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, cur_buf)); |
3374 | ||
3375 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3376 | buffer-local value here, make the `let' change the global | |
3377 | value by changing the value of SYMBOL in all buffers not | |
3378 | having their own value. This is consistent with what | |
3379 | happens with other buffer-local variables. */ | |
3380 | if (NILP (where) | |
3381 | && sym->redirect == SYMBOL_FORWARDED) | |
3382 | { | |
3383 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3384 | ++specpdl_ptr; | |
3385 | Fset_default (symbol, value); | |
3386 | return; | |
3387 | } | |
3388 | } | |
3389 | else | |
3390 | specpdl_ptr->symbol = symbol; | |
3391 | ||
3392 | specpdl_ptr++; | |
94b612ad | 3393 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3394 | break; |
3395 | } | |
3396 | default: abort (); | |
9ab90667 | 3397 | } |
db9f0278 JB |
3398 | } |
3399 | ||
3400 | void | |
d3da34e0 | 3401 | record_unwind_protect (Lisp_Object (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3402 | { |
9ba8e10d CY |
3403 | eassert (!handling_signal); |
3404 | ||
db9f0278 JB |
3405 | if (specpdl_ptr == specpdl + specpdl_size) |
3406 | grow_specpdl (); | |
3407 | specpdl_ptr->func = function; | |
3408 | specpdl_ptr->symbol = Qnil; | |
3409 | specpdl_ptr->old_value = arg; | |
3410 | specpdl_ptr++; | |
3411 | } | |
3412 | ||
3413 | Lisp_Object | |
d3da34e0 | 3414 | unbind_to (int count, Lisp_Object value) |
db9f0278 | 3415 | { |
5a073f50 KS |
3416 | Lisp_Object quitf = Vquit_flag; |
3417 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3418 | |
5a073f50 | 3419 | GCPRO2 (value, quitf); |
db9f0278 JB |
3420 | Vquit_flag = Qnil; |
3421 | ||
3422 | while (specpdl_ptr != specpdl + count) | |
3423 | { | |
611a8f8c RS |
3424 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3425 | the work to unbind it. We decrement first | |
3426 | so that an error in unbinding won't try to unbind | |
3427 | the same entry again, and we copy the binding first | |
3428 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3429 | |
45f266dc DL |
3430 | struct specbinding this_binding; |
3431 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3432 | |
3433 | if (this_binding.func != 0) | |
3434 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3435 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3436 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3437 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3438 | bound a variable that had a buffer-local or frame-local |
3439 | binding. WHERE nil means that the variable had the default | |
0967b4b0 | 3440 | value when it was bound. CURRENT-BUFFER is the buffer that |
bb8e180f | 3441 | was current when the variable was bound. */ |
611a8f8c | 3442 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3443 | { |
eb700b82 | 3444 | Lisp_Object symbol, where; |
719177b3 | 3445 | |
611a8f8c RS |
3446 | symbol = XCAR (this_binding.symbol); |
3447 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3448 | |
eb700b82 | 3449 | if (NILP (where)) |
611a8f8c | 3450 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3451 | /* If `where' is non-nil, reset the value in the appropriate |
3452 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3453 | else if (BUFFERP (where) |
3454 | ? !NILP (Flocal_variable_p (symbol, where)) | |
3455 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) | |
3456 | set_internal (symbol, this_binding.old_value, where, 1); | |
719177b3 | 3457 | } |
94b612ad SM |
3458 | /* If variable has a trivial value (no forwarding), we can |
3459 | just set it. No need to check for constant symbols here, | |
3460 | since that was already done by specbind. */ | |
3461 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3462 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3463 | this_binding.old_value); | |
db9f0278 | 3464 | else |
94b612ad SM |
3465 | /* NOTE: we only ever come here if make_local_foo was used for |
3466 | the first time on this var within this let. */ | |
3467 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3468 | } |
177c0ea7 | 3469 | |
5a073f50 KS |
3470 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3471 | Vquit_flag = quitf; | |
db9f0278 JB |
3472 | |
3473 | UNGCPRO; | |
db9f0278 JB |
3474 | return value; |
3475 | } | |
b9598260 | 3476 | |
4a330052 | 3477 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3478 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3479 | A special variable is one that will be bound dynamically, even in a | |
3480 | context where binding is lexical by default. */) | |
c566235d | 3481 | (Lisp_Object symbol) |
b9598260 SM |
3482 | { |
3483 | CHECK_SYMBOL (symbol); | |
3484 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3485 | } | |
3486 | ||
db9f0278 | 3487 | \f |
db9f0278 | 3488 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3489 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3490 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3491 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 JB |
3492 | { |
3493 | register struct backtrace *backlist = backtrace_list; | |
3494 | register int i; | |
3495 | ||
b7826503 | 3496 | CHECK_NUMBER (level); |
db9f0278 JB |
3497 | |
3498 | for (i = 0; backlist && i < XINT (level); i++) | |
3499 | { | |
3500 | backlist = backlist->next; | |
3501 | } | |
3502 | ||
3503 | if (backlist) | |
265a9e55 | 3504 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3505 | |
3506 | return flag; | |
3507 | } | |
3508 | ||
3509 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3510 | doc: /* Print a trace of Lisp function calls currently active. |
3511 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3512 | (void) |
db9f0278 JB |
3513 | { |
3514 | register struct backtrace *backlist = backtrace_list; | |
db9f0278 JB |
3515 | Lisp_Object tail; |
3516 | Lisp_Object tem; | |
db9f0278 | 3517 | struct gcpro gcpro1; |
d4b6d95d | 3518 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3519 | |
d4b6d95d LMI |
3520 | if (NILP (Vprint_level)) |
3521 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 JB |
3522 | |
3523 | tail = Qnil; | |
3524 | GCPRO1 (tail); | |
3525 | ||
3526 | while (backlist) | |
3527 | { | |
3528 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
44f230aa | 3529 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3530 | { |
3531 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3532 | write_string ("\n", -1); |
db9f0278 JB |
3533 | } |
3534 | else | |
3535 | { | |
3536 | tem = *backlist->function; | |
f6d62986 | 3537 | Fprin1 (tem, Qnil); /* This can QUIT. */ |
db9f0278 | 3538 | write_string ("(", -1); |
44f230aa SM |
3539 | if (backlist->nargs == MANY) |
3540 | { /* FIXME: Can this happen? */ | |
a3eed478 | 3541 | int i; |
db9f0278 | 3542 | for (tail = *backlist->args, i = 0; |
265a9e55 | 3543 | !NILP (tail); |
a3eed478 | 3544 | tail = Fcdr (tail), i = 1) |
db9f0278 JB |
3545 | { |
3546 | if (i) write_string (" ", -1); | |
3547 | Fprin1 (Fcar (tail), Qnil); | |
3548 | } | |
3549 | } | |
3550 | else | |
3551 | { | |
f66c7cf8 | 3552 | ptrdiff_t i; |
db9f0278 JB |
3553 | for (i = 0; i < backlist->nargs; i++) |
3554 | { | |
3555 | if (i) write_string (" ", -1); | |
3556 | Fprin1 (backlist->args[i], Qnil); | |
3557 | } | |
3558 | } | |
b6703b02 | 3559 | write_string (")\n", -1); |
db9f0278 | 3560 | } |
db9f0278 JB |
3561 | backlist = backlist->next; |
3562 | } | |
3563 | ||
d4b6d95d | 3564 | Vprint_level = old_print_level; |
db9f0278 JB |
3565 | UNGCPRO; |
3566 | return Qnil; | |
3567 | } | |
3568 | ||
17401c97 | 3569 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3570 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3571 | If that frame has not evaluated the arguments yet (or is a special form), | |
3572 | the value is (nil FUNCTION ARG-FORMS...). | |
3573 | If that frame has evaluated its arguments and called its function already, | |
3574 | the value is (t FUNCTION ARG-VALUES...). | |
3575 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3576 | FUNCTION is whatever was supplied as car of evaluated list, | |
3577 | or a lambda expression for macro calls. | |
3578 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3579 | (Lisp_Object nframes) |
db9f0278 JB |
3580 | { |
3581 | register struct backtrace *backlist = backtrace_list; | |
5d5d959d | 3582 | register EMACS_INT i; |
db9f0278 JB |
3583 | Lisp_Object tem; |
3584 | ||
b7826503 | 3585 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3586 | |
3587 | /* Find the frame requested. */ | |
b6703b02 | 3588 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3589 | backlist = backlist->next; |
3590 | ||
3591 | if (!backlist) | |
3592 | return Qnil; | |
44f230aa | 3593 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3594 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); |
3595 | else | |
3596 | { | |
44f230aa | 3597 | if (backlist->nargs == MANY) /* FIXME: Can this happen? */ |
db9f0278 JB |
3598 | tem = *backlist->args; |
3599 | else | |
3600 | tem = Flist (backlist->nargs, backlist->args); | |
3601 | ||
3602 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3603 | } | |
3604 | } | |
a2ff3819 | 3605 | |
db9f0278 | 3606 | \f |
244ed907 | 3607 | #if BYTE_MARK_STACK |
4ce0541e | 3608 | void |
d3da34e0 | 3609 | mark_backtrace (void) |
4ce0541e SM |
3610 | { |
3611 | register struct backtrace *backlist; | |
f66c7cf8 | 3612 | ptrdiff_t i; |
4ce0541e SM |
3613 | |
3614 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3615 | { | |
3616 | mark_object (*backlist->function); | |
3617 | ||
44f230aa SM |
3618 | if (backlist->nargs == UNEVALLED |
3619 | || backlist->nargs == MANY) /* FIXME: Can this happen? */ | |
c5101a77 | 3620 | i = 1; |
4ce0541e | 3621 | else |
c5101a77 PE |
3622 | i = backlist->nargs; |
3623 | while (i--) | |
4ce0541e SM |
3624 | mark_object (backlist->args[i]); |
3625 | } | |
3626 | } | |
244ed907 | 3627 | #endif |
4ce0541e | 3628 | |
dfcf069d | 3629 | void |
d3da34e0 | 3630 | syms_of_eval (void) |
db9f0278 | 3631 | { |
29208e82 | 3632 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
82fc29a1 | 3633 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3634 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3635 | an error is signaled. |
3636 | You can safely use a value considerably larger than the default value, | |
3637 | if that proves inconveniently small. However, if you increase it too far, | |
3638 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3639 | |
29208e82 | 3640 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
9dbc9081 | 3641 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3642 | |
3643 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3644 | actual stack overflow in C, which would be fatal for Emacs. |
3645 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3646 | if that proves inconveniently small. However, if you increase it too far, |
3647 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3648 | |
29208e82 | 3649 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3650 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3651 | If the value is t, that means do an ordinary quit. |
3652 | If the value equals `throw-on-input', that means quit by throwing | |
3653 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3654 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3655 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3656 | Vquit_flag = Qnil; |
3657 | ||
29208e82 | 3658 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3659 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3660 | Note that `quit-flag' will still be set by typing C-g, | |
3661 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3662 | To prevent this happening, set `quit-flag' to nil | |
3663 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3664 | Vinhibit_quit = Qnil; |
3665 | ||
cd3520a4 JB |
3666 | DEFSYM (Qinhibit_quit, "inhibit-quit"); |
3667 | DEFSYM (Qautoload, "autoload"); | |
3668 | DEFSYM (Qdebug_on_error, "debug-on-error"); | |
3669 | DEFSYM (Qmacro, "macro"); | |
3670 | DEFSYM (Qdeclare, "declare"); | |
177c0ea7 | 3671 | |
db9f0278 JB |
3672 | /* Note that the process handling also uses Qexit, but we don't want |
3673 | to staticpro it twice, so we just do it here. */ | |
cd3520a4 | 3674 | DEFSYM (Qexit, "exit"); |
b9598260 | 3675 | |
cd3520a4 JB |
3676 | DEFSYM (Qinteractive, "interactive"); |
3677 | DEFSYM (Qcommandp, "commandp"); | |
3678 | DEFSYM (Qdefun, "defun"); | |
3679 | DEFSYM (Qand_rest, "&rest"); | |
3680 | DEFSYM (Qand_optional, "&optional"); | |
3681 | DEFSYM (Qclosure, "closure"); | |
3682 | DEFSYM (Qdebug, "debug"); | |
f01cbfdd | 3683 | |
29208e82 | 3684 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
9dbc9081 PJ |
3685 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3686 | Does not apply to errors handled by `condition-case' or those | |
3687 | matched by `debug-ignored-errors'. | |
3688 | If the value is a list, an error only means to enter the debugger | |
3689 | if one of its condition symbols appears in the list. | |
3690 | When you evaluate an expression interactively, this variable | |
3691 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f CY |
3692 | The command `toggle-debug-on-error' toggles this. |
3693 | See also the variable `debug-on-quit'. */); | |
128c0f66 | 3694 | Vdebug_on_error = Qnil; |
db9f0278 | 3695 | |
29208e82 | 3696 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
9dbc9081 PJ |
3697 | doc: /* *List of errors for which the debugger should not be called. |
3698 | Each element may be a condition-name or a regexp that matches error messages. | |
3699 | If any element applies to a given error, that error skips the debugger | |
3700 | and just returns to top level. | |
3701 | This overrides the variable `debug-on-error'. | |
3702 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3703 | Vdebug_ignored_errors = Qnil; |
3704 | ||
29208e82 | 3705 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
82fc29a1 JB |
3706 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3707 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3708 | debug_on_quit = 0; |
3709 | ||
29208e82 | 3710 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3711 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3712 | |
29208e82 | 3713 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3714 | doc: /* Non-nil means debugger may continue execution. |
3715 | This is nil when the debugger is called under circumstances where it | |
3716 | might not be safe to continue. */); | |
dac204bc | 3717 | debugger_may_continue = 1; |
556d7314 | 3718 | |
29208e82 | 3719 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3720 | doc: /* Function to call to invoke debugger. |
3721 | If due to frame exit, args are `exit' and the value being returned; | |
3722 | this function's value will be returned instead of that. | |
3723 | If due to error, args are `error' and a list of the args to `signal'. | |
3724 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3725 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3726 | Vdebugger = Qnil; |
3727 | ||
29208e82 | 3728 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3729 | doc: /* If non-nil, this is a function for `signal' to call. |
3730 | It receives the same arguments that `signal' was given. | |
3731 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3732 | Vsignal_hook_function = Qnil; |
3733 | ||
29208e82 | 3734 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
9dbc9081 PJ |
3735 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3736 | Note that `debug-on-error', `debug-on-quit' and friends | |
3737 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3738 | Vdebug_on_signal = Qnil; |
61ede770 | 3739 | |
29208e82 | 3740 | DEFVAR_LISP ("macro-declaration-function", Vmacro_declaration_function, |
d6edd563 GM |
3741 | doc: /* Function to process declarations in a macro definition. |
3742 | The function will be called with two args MACRO and DECL. | |
3743 | MACRO is the name of the macro being defined. | |
3744 | DECL is a list `(declare ...)' containing the declarations. | |
3745 | The value the function returns is not used. */); | |
3746 | Vmacro_declaration_function = Qnil; | |
3747 | ||
b38b1ec0 SM |
3748 | /* When lexical binding is being used, |
3749 | vinternal_interpreter_environment is non-nil, and contains an alist | |
3750 | of lexically-bound variable, or (t), indicating an empty | |
3751 | environment. The lisp name of this variable would be | |
3752 | `internal-interpreter-environment' if it weren't hidden. | |
3753 | Every element of this list can be either a cons (VAR . VAL) | |
3754 | specifying a lexical binding, or a single symbol VAR indicating | |
3755 | that this variable should use dynamic scoping. */ | |
cd3520a4 | 3756 | DEFSYM (Qinternal_interpreter_environment, "internal-interpreter-environment"); |
b38b1ec0 SM |
3757 | DEFVAR_LISP ("internal-interpreter-environment", |
3758 | Vinternal_interpreter_environment, | |
b9598260 SM |
3759 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
3760 | When lexical binding is not being used, this variable is nil. | |
3761 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3762 | alist of active lexical bindings. */); | |
3763 | Vinternal_interpreter_environment = Qnil; | |
c80e3b4a | 3764 | /* Don't export this variable to Elisp, so no one can mess with it |
b38b1ec0 SM |
3765 | (Just imagine if someone makes it buffer-local). */ |
3766 | Funintern (Qinternal_interpreter_environment, Qnil); | |
b9598260 | 3767 | |
cd3520a4 | 3768 | DEFSYM (Vrun_hooks, "run-hooks"); |
db9f0278 JB |
3769 | |
3770 | staticpro (&Vautoload_queue); | |
3771 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3772 | staticpro (&Vsignaling_function); |
3773 | Vsignaling_function = Qnil; | |
db9f0278 | 3774 | |
d1f55f16 CY |
3775 | inhibit_lisp_code = Qnil; |
3776 | ||
db9f0278 JB |
3777 | defsubr (&Sor); |
3778 | defsubr (&Sand); | |
3779 | defsubr (&Sif); | |
3780 | defsubr (&Scond); | |
3781 | defsubr (&Sprogn); | |
3782 | defsubr (&Sprog1); | |
3783 | defsubr (&Sprog2); | |
3784 | defsubr (&Ssetq); | |
3785 | defsubr (&Squote); | |
3786 | defsubr (&Sfunction); | |
3787 | defsubr (&Sdefun); | |
3788 | defsubr (&Sdefmacro); | |
3789 | defsubr (&Sdefvar); | |
19cebf5a | 3790 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3791 | defsubr (&Sdefconst); |
3792 | defsubr (&Suser_variable_p); | |
3793 | defsubr (&Slet); | |
3794 | defsubr (&SletX); | |
3795 | defsubr (&Swhile); | |
3796 | defsubr (&Smacroexpand); | |
3797 | defsubr (&Scatch); | |
3798 | defsubr (&Sthrow); | |
3799 | defsubr (&Sunwind_protect); | |
3800 | defsubr (&Scondition_case); | |
3801 | defsubr (&Ssignal); | |
3802 | defsubr (&Sinteractive_p); | |
4b664e76 | 3803 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
3804 | defsubr (&Scommandp); |
3805 | defsubr (&Sautoload); | |
3806 | defsubr (&Seval); | |
3807 | defsubr (&Sapply); | |
3808 | defsubr (&Sfuncall); | |
ff936e53 SM |
3809 | defsubr (&Srun_hooks); |
3810 | defsubr (&Srun_hook_with_args); | |
3811 | defsubr (&Srun_hook_with_args_until_success); | |
3812 | defsubr (&Srun_hook_with_args_until_failure); | |
f6d62986 | 3813 | defsubr (&Srun_hook_wrapped); |
661c7d6e | 3814 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3815 | defsubr (&Sbacktrace_debug); |
3816 | defsubr (&Sbacktrace); | |
3817 | defsubr (&Sbacktrace_frame); | |
4a330052 | 3818 | defsubr (&Sspecial_variable_p); |
b9598260 | 3819 | defsubr (&Sfunctionp); |
db9f0278 | 3820 | } |