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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
73b0cd50 | 2 | Copyright (C) 1985-1987, 1993-1995, 1999-2011 Free Software Foundation, Inc. |
db9f0278 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
9ec0b715 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
db9f0278 | 7 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
8 | the Free Software Foundation, either version 3 of the License, or |
9 | (at your option) any later version. | |
db9f0278 JB |
10 | |
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
db9f0278 JB |
18 | |
19 | ||
18160b98 | 20 | #include <config.h> |
eb3f1cc8 | 21 | #include <limits.h> |
d7306fe6 | 22 | #include <setjmp.h> |
4e2fe2e6 | 23 | #include <stdio.h> |
db9f0278 | 24 | #include "lisp.h" |
9ac0d9e0 | 25 | #include "blockinput.h" |
db9f0278 | 26 | #include "commands.h" |
1f98fa48 | 27 | #include "keyboard.h" |
3648c842 | 28 | #include "dispextern.h" |
94b612ad | 29 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 30 | |
b70e1a2b SM |
31 | #if HAVE_X_WINDOWS |
32 | #include "xterm.h" | |
33 | #endif | |
34 | ||
eb3f1cc8 PE |
35 | #ifndef SIZE_MAX |
36 | # define SIZE_MAX ((size_t) -1) | |
37 | #endif | |
38 | ||
f6d62986 SM |
39 | /* This definition is duplicated in alloc.c and keyboard.c. */ |
40 | /* Putting it in lisp.h makes cc bomb out! */ | |
db9f0278 JB |
41 | |
42 | struct backtrace | |
4c576a83 GM |
43 | { |
44 | struct backtrace *next; | |
45 | Lisp_Object *function; | |
f6d62986 | 46 | Lisp_Object *args; /* Points to vector of args. */ |
44f230aa SM |
47 | #define NARGS_BITS (BITS_PER_INT - 2) |
48 | /* Let's not use size_t because we want to allow negative values (for | |
49 | UNEVALLED). Also let's steal 2 bits so we save a word (or more for | |
50 | alignment). In any case I doubt Emacs would survive a function call with | |
51 | more than 500M arguments. */ | |
52 | int nargs : NARGS_BITS; /* Length of vector. | |
53 | If nargs is UNEVALLED, args points | |
54 | to slot holding list of unevalled args. */ | |
55 | char evalargs : 1; | |
f6d62986 | 56 | /* Nonzero means call value of debugger when done with this operation. */ |
44f230aa | 57 | char debug_on_exit : 1; |
4c576a83 | 58 | }; |
db9f0278 | 59 | |
57a96f5c | 60 | static struct backtrace *backtrace_list; |
244ed907 PE |
61 | |
62 | #if !BYTE_MARK_STACK | |
63 | static | |
64 | #endif | |
db9f0278 JB |
65 | struct catchtag *catchlist; |
66 | ||
244ed907 PE |
67 | /* Chain of condition handlers currently in effect. |
68 | The elements of this chain are contained in the stack frames | |
69 | of Fcondition_case and internal_condition_case. | |
70 | When an error is signaled (by calling Fsignal, below), | |
71 | this chain is searched for an element that applies. */ | |
72 | ||
73 | #if !BYTE_MARK_STACK | |
74 | static | |
75 | #endif | |
76 | struct handler *handlerlist; | |
77 | ||
15934ffa RS |
78 | #ifdef DEBUG_GCPRO |
79 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
80 | int gcpro_level; | |
81 | #endif | |
82 | ||
6fd797f5 | 83 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
29208e82 | 84 | Lisp_Object Qinhibit_quit; |
955cbe7b PE |
85 | Lisp_Object Qand_rest; |
86 | static Lisp_Object Qand_optional; | |
87 | static Lisp_Object Qdebug_on_error; | |
88 | static Lisp_Object Qdeclare; | |
b9598260 SM |
89 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
90 | ||
ed008a6d | 91 | static Lisp_Object Qdebug; |
db9f0278 | 92 | |
6e6e9f08 RS |
93 | /* This holds either the symbol `run-hooks' or nil. |
94 | It is nil at an early stage of startup, and when Emacs | |
95 | is shutting down. */ | |
4c576a83 | 96 | |
db9f0278 JB |
97 | Lisp_Object Vrun_hooks; |
98 | ||
99 | /* Non-nil means record all fset's and provide's, to be undone | |
100 | if the file being autoloaded is not fully loaded. | |
101 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 102 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
103 | |
104 | Lisp_Object Vautoload_queue; | |
105 | ||
106 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 107 | |
5816888b | 108 | EMACS_INT specpdl_size; |
db9f0278 JB |
109 | |
110 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 111 | |
db9f0278 JB |
112 | struct specbinding *specpdl; |
113 | ||
114 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 115 | |
ab837828 | 116 | struct specbinding *specpdl_ptr; |
db9f0278 | 117 | |
db9f0278 | 118 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 119 | |
57a96f5c | 120 | static EMACS_INT lisp_eval_depth; |
db9f0278 | 121 | |
be857679 | 122 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 123 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 124 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
125 | know that the debugger itself has an error, and we should just |
126 | signal the error instead of entering an infinite loop of debugger | |
127 | invocations. */ | |
4c576a83 | 128 | |
57a96f5c | 129 | static int when_entered_debugger; |
db9f0278 | 130 | |
a2ff3819 GM |
131 | /* The function from which the last `signal' was called. Set in |
132 | Fsignal. */ | |
133 | ||
134 | Lisp_Object Vsignaling_function; | |
135 | ||
4c576a83 GM |
136 | /* Set to non-zero while processing X events. Checked in Feval to |
137 | make sure the Lisp interpreter isn't called from a signal handler, | |
138 | which is unsafe because the interpreter isn't reentrant. */ | |
139 | ||
140 | int handling_signal; | |
141 | ||
f66c7cf8 | 142 | static Lisp_Object funcall_lambda (Lisp_Object, ptrdiff_t, Lisp_Object *); |
f57e2426 | 143 | static void unwind_to_catch (struct catchtag *, Lisp_Object) NO_RETURN; |
2f7c71a1 | 144 | static int interactive_p (int); |
7200d79c | 145 | static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args); |
cd64ea1d | 146 | static Lisp_Object Ffetch_bytecode (Lisp_Object); |
873759d5 | 147 | \f |
dfcf069d | 148 | void |
d3da34e0 | 149 | init_eval_once (void) |
db9f0278 JB |
150 | { |
151 | specpdl_size = 50; | |
716acfce | 152 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 153 | specpdl_ptr = specpdl; |
6588243d | 154 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
c530e1c2 | 155 | max_specpdl_size = 1300; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 156 | max_lisp_eval_depth = 600; |
34d470ba RS |
157 | |
158 | Vrun_hooks = Qnil; | |
db9f0278 JB |
159 | } |
160 | ||
dfcf069d | 161 | void |
d3da34e0 | 162 | init_eval (void) |
db9f0278 JB |
163 | { |
164 | specpdl_ptr = specpdl; | |
165 | catchlist = 0; | |
166 | handlerlist = 0; | |
167 | backtrace_list = 0; | |
168 | Vquit_flag = Qnil; | |
169 | debug_on_next_call = 0; | |
170 | lisp_eval_depth = 0; | |
87e21fbd | 171 | #ifdef DEBUG_GCPRO |
15934ffa | 172 | gcpro_level = 0; |
87e21fbd | 173 | #endif |
be857679 | 174 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 175 | when_entered_debugger = -1; |
db9f0278 JB |
176 | } |
177 | ||
f6d62986 | 178 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb RS |
179 | |
180 | static Lisp_Object | |
d3da34e0 | 181 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
182 | { |
183 | max_specpdl_size = XINT (XCAR (data)); | |
184 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 185 | return Qnil; |
9f5903bb RS |
186 | } |
187 | ||
188 | /* Call the Lisp debugger, giving it argument ARG. */ | |
189 | ||
475545b5 | 190 | static Lisp_Object |
d3da34e0 | 191 | call_debugger (Lisp_Object arg) |
db9f0278 | 192 | { |
3648c842 | 193 | int debug_while_redisplaying; |
aed13378 | 194 | int count = SPECPDL_INDEX (); |
3648c842 | 195 | Lisp_Object val; |
5816888b | 196 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 197 | |
9f5903bb RS |
198 | /* Temporarily bump up the stack limits, |
199 | so the debugger won't run out of stack. */ | |
177c0ea7 | 200 | |
9f5903bb RS |
201 | max_specpdl_size += 1; |
202 | record_unwind_protect (restore_stack_limits, | |
203 | Fcons (make_number (old_max), | |
204 | make_number (max_lisp_eval_depth))); | |
205 | max_specpdl_size = old_max; | |
206 | ||
207 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
208 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
209 | ||
210 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
211 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 212 | |
d148e14d | 213 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
214 | if (display_hourglass_p) |
215 | cancel_hourglass (); | |
237c23b0 GM |
216 | #endif |
217 | ||
db9f0278 | 218 | debug_on_next_call = 0; |
be857679 | 219 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
220 | |
221 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
222 | displayed if the debugger is invoked during redisplay. */ | |
223 | debug_while_redisplaying = redisplaying_p; | |
224 | redisplaying_p = 0; | |
556d7314 GM |
225 | specbind (intern ("debugger-may-continue"), |
226 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 227 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 228 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
229 | |
230 | #if 0 /* Binding this prevents execution of Lisp code during | |
231 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 232 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 233 | #endif |
177c0ea7 | 234 | |
3648c842 GM |
235 | val = apply1 (Vdebugger, arg); |
236 | ||
237 | /* Interrupting redisplay and resuming it later is not safe under | |
238 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 239 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
240 | if (debug_while_redisplaying) |
241 | Ftop_level (); | |
242 | ||
556d7314 | 243 | return unbind_to (count, val); |
db9f0278 JB |
244 | } |
245 | ||
475545b5 | 246 | static void |
d3da34e0 | 247 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
248 | { |
249 | debug_on_next_call = 0; | |
250 | backtrace_list->debug_on_exit = 1; | |
251 | call_debugger (Fcons (code, Qnil)); | |
252 | } | |
253 | \f | |
254 | /* NOTE!!! Every function that can call EVAL must protect its args | |
255 | and temporaries from garbage collection while it needs them. | |
256 | The definition of `For' shows what you have to do. */ | |
257 | ||
258 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
259 | doc: /* Eval args until one of them yields non-nil, then return that value. |
260 | The remaining args are not evalled at all. | |
261 | If all args return nil, return nil. | |
533eb34b | 262 | usage: (or CONDITIONS...) */) |
5842a27b | 263 | (Lisp_Object args) |
db9f0278 | 264 | { |
e509f168 | 265 | register Lisp_Object val = Qnil; |
db9f0278 JB |
266 | struct gcpro gcpro1; |
267 | ||
e509f168 | 268 | GCPRO1 (args); |
db9f0278 | 269 | |
e509f168 | 270 | while (CONSP (args)) |
db9f0278 | 271 | { |
defb1411 | 272 | val = eval_sub (XCAR (args)); |
265a9e55 | 273 | if (!NILP (val)) |
db9f0278 | 274 | break; |
e509f168 | 275 | args = XCDR (args); |
db9f0278 | 276 | } |
db9f0278 JB |
277 | |
278 | UNGCPRO; | |
279 | return val; | |
280 | } | |
281 | ||
282 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 283 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
284 | The remaining args are not evalled at all. |
285 | If no arg yields nil, return the last arg's value. | |
533eb34b | 286 | usage: (and CONDITIONS...) */) |
5842a27b | 287 | (Lisp_Object args) |
db9f0278 | 288 | { |
e509f168 | 289 | register Lisp_Object val = Qt; |
db9f0278 JB |
290 | struct gcpro gcpro1; |
291 | ||
e509f168 | 292 | GCPRO1 (args); |
db9f0278 | 293 | |
e509f168 | 294 | while (CONSP (args)) |
db9f0278 | 295 | { |
defb1411 | 296 | val = eval_sub (XCAR (args)); |
265a9e55 | 297 | if (NILP (val)) |
db9f0278 | 298 | break; |
e509f168 | 299 | args = XCDR (args); |
db9f0278 | 300 | } |
db9f0278 JB |
301 | |
302 | UNGCPRO; | |
303 | return val; | |
304 | } | |
305 | ||
306 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 307 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
308 | Returns the value of THEN or the value of the last of the ELSE's. |
309 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
310 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 311 | usage: (if COND THEN ELSE...) */) |
5842a27b | 312 | (Lisp_Object args) |
db9f0278 JB |
313 | { |
314 | register Lisp_Object cond; | |
315 | struct gcpro gcpro1; | |
316 | ||
317 | GCPRO1 (args); | |
defb1411 | 318 | cond = eval_sub (Fcar (args)); |
db9f0278 JB |
319 | UNGCPRO; |
320 | ||
265a9e55 | 321 | if (!NILP (cond)) |
defb1411 | 322 | return eval_sub (Fcar (Fcdr (args))); |
db9f0278 JB |
323 | return Fprogn (Fcdr (Fcdr (args))); |
324 | } | |
325 | ||
326 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
327 | doc: /* Try each clause until one succeeds. |
328 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
329 | and, if the value is non-nil, this clause succeeds: | |
330 | then the expressions in BODY are evaluated and the last one's | |
331 | value is the value of the cond-form. | |
332 | If no clause succeeds, cond returns nil. | |
333 | If a clause has one element, as in (CONDITION), | |
334 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 335 | usage: (cond CLAUSES...) */) |
5842a27b | 336 | (Lisp_Object args) |
db9f0278 JB |
337 | { |
338 | register Lisp_Object clause, val; | |
339 | struct gcpro gcpro1; | |
340 | ||
341 | val = Qnil; | |
342 | GCPRO1 (args); | |
265a9e55 | 343 | while (!NILP (args)) |
db9f0278 JB |
344 | { |
345 | clause = Fcar (args); | |
defb1411 | 346 | val = eval_sub (Fcar (clause)); |
265a9e55 | 347 | if (!NILP (val)) |
db9f0278 | 348 | { |
03699b14 KR |
349 | if (!EQ (XCDR (clause), Qnil)) |
350 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
351 | break; |
352 | } | |
03699b14 | 353 | args = XCDR (args); |
db9f0278 JB |
354 | } |
355 | UNGCPRO; | |
356 | ||
357 | return val; | |
358 | } | |
359 | ||
a7ca3326 | 360 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, |
9dbc9081 | 361 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 362 | usage: (progn BODY...) */) |
5842a27b | 363 | (Lisp_Object args) |
db9f0278 | 364 | { |
e509f168 | 365 | register Lisp_Object val = Qnil; |
db9f0278 JB |
366 | struct gcpro gcpro1; |
367 | ||
e509f168 | 368 | GCPRO1 (args); |
db9f0278 | 369 | |
e509f168 | 370 | while (CONSP (args)) |
db9f0278 | 371 | { |
defb1411 | 372 | val = eval_sub (XCAR (args)); |
e509f168 | 373 | args = XCDR (args); |
db9f0278 | 374 | } |
db9f0278 JB |
375 | |
376 | UNGCPRO; | |
377 | return val; | |
378 | } | |
379 | ||
380 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 381 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
382 | The value of FIRST is saved during the evaluation of the remaining args, |
383 | whose values are discarded. | |
7a25dc6d | 384 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 385 | (Lisp_Object args) |
db9f0278 JB |
386 | { |
387 | Lisp_Object val; | |
388 | register Lisp_Object args_left; | |
389 | struct gcpro gcpro1, gcpro2; | |
390 | register int argnum = 0; | |
391 | ||
9ac66b45 | 392 | if (NILP (args)) |
db9f0278 JB |
393 | return Qnil; |
394 | ||
395 | args_left = args; | |
396 | val = Qnil; | |
397 | GCPRO2 (args, val); | |
398 | ||
399 | do | |
400 | { | |
ba83908c | 401 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 402 | if (!(argnum++)) |
ba83908c SM |
403 | val = tem; |
404 | args_left = XCDR (args_left); | |
db9f0278 | 405 | } |
ba83908c | 406 | while (CONSP (args_left)); |
db9f0278 JB |
407 | |
408 | UNGCPRO; | |
409 | return val; | |
410 | } | |
411 | ||
412 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 413 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
414 | The value of FORM2 is saved during the evaluation of the |
415 | remaining args, whose values are discarded. | |
416 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 417 | (Lisp_Object args) |
db9f0278 JB |
418 | { |
419 | Lisp_Object val; | |
420 | register Lisp_Object args_left; | |
421 | struct gcpro gcpro1, gcpro2; | |
422 | register int argnum = -1; | |
423 | ||
424 | val = Qnil; | |
425 | ||
87d238ba | 426 | if (NILP (args)) |
db9f0278 JB |
427 | return Qnil; |
428 | ||
429 | args_left = args; | |
430 | val = Qnil; | |
431 | GCPRO2 (args, val); | |
432 | ||
433 | do | |
434 | { | |
ba83908c | 435 | Lisp_Object tem = eval_sub (XCAR (args_left)); |
db9f0278 | 436 | if (!(argnum++)) |
ba83908c SM |
437 | val = tem; |
438 | args_left = XCDR (args_left); | |
db9f0278 | 439 | } |
ba83908c | 440 | while (CONSP (args_left)); |
db9f0278 JB |
441 | |
442 | UNGCPRO; | |
443 | return val; | |
444 | } | |
445 | ||
446 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
447 | doc: /* Set each SYM to the value of its VAL. |
448 | The symbols SYM are variables; they are literal (not evaluated). | |
449 | The values VAL are expressions; they are evaluated. | |
450 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
451 | The second VAL is not computed until after the first SYM is set, and so on; | |
452 | each VAL can use the new value of variables set earlier in the `setq'. | |
453 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 454 | usage: (setq [SYM VAL]...) */) |
5842a27b | 455 | (Lisp_Object args) |
db9f0278 JB |
456 | { |
457 | register Lisp_Object args_left; | |
b9598260 | 458 | register Lisp_Object val, sym, lex_binding; |
db9f0278 JB |
459 | struct gcpro gcpro1; |
460 | ||
1283140e | 461 | if (NILP (args)) |
db9f0278 JB |
462 | return Qnil; |
463 | ||
464 | args_left = args; | |
465 | GCPRO1 (args); | |
466 | ||
467 | do | |
468 | { | |
defb1411 | 469 | val = eval_sub (Fcar (Fcdr (args_left))); |
db9f0278 | 470 | sym = Fcar (args_left); |
b9598260 | 471 | |
defb1411 | 472 | /* Like for eval_sub, we do not check declared_special here since |
f07a954e SM |
473 | it's been done when let-binding. */ |
474 | if (!NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
b9598260 | 475 | && SYMBOLP (sym) |
f07a954e SM |
476 | && !NILP (lex_binding |
477 | = Fassq (sym, Vinternal_interpreter_environment))) | |
b9598260 SM |
478 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ |
479 | else | |
480 | Fset (sym, val); /* SYM is dynamically bound. */ | |
481 | ||
db9f0278 JB |
482 | args_left = Fcdr (Fcdr (args_left)); |
483 | } | |
265a9e55 | 484 | while (!NILP(args_left)); |
db9f0278 JB |
485 | |
486 | UNGCPRO; | |
487 | return val; | |
488 | } | |
177c0ea7 | 489 | |
db9f0278 | 490 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
491 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
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; |
ce5b453a SM |
775 | sym->redirect = SYMBOL_VARALIAS; |
776 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
777 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
778 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
779 | /* Even if docstring is nil: remove old docstring. */ |
780 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 781 | |
4a9308b8 | 782 | return base_variable; |
19cebf5a GM |
783 | } |
784 | ||
785 | ||
db9f0278 | 786 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 787 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
788 | You are not required to define a variable in order to use it, |
789 | but the definition can supply documentation and an initial value | |
790 | in a way that tags can recognize. | |
791 | ||
792 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
793 | If SYMBOL is buffer-local, its default value is what is set; | |
794 | buffer-local values are not affected. | |
795 | INITVALUE and DOCSTRING are optional. | |
796 | If DOCSTRING starts with *, this variable is identified as a user option. | |
797 | This means that M-x set-variable recognizes it. | |
798 | See also `user-variable-p'. | |
799 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
800 | |
801 | If SYMBOL has a local binding, then this form affects the local | |
802 | binding. This is usually not what you want. Thus, if you need to | |
803 | load a file defining variables, with this form or with `defconst' or | |
804 | `defcustom', you should always load that file _outside_ any bindings | |
805 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
806 | this respect.) | |
2df5238c | 807 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 808 | (Lisp_Object args) |
db9f0278 | 809 | { |
a42ba017 | 810 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
811 | |
812 | sym = Fcar (args); | |
a42ba017 RS |
813 | tail = Fcdr (args); |
814 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 815 | error ("Too many arguments"); |
a42ba017 | 816 | |
33568849 | 817 | tem = Fdefault_boundp (sym); |
a42ba017 | 818 | if (!NILP (tail)) |
db9f0278 | 819 | { |
ba83908c SM |
820 | /* Do it before evaluating the initial value, for self-references. */ |
821 | XSYMBOL (sym)->declared_special = 1; | |
590130fb | 822 | |
1c9916a1 SM |
823 | if (SYMBOL_CONSTANT_P (sym)) |
824 | { | |
825 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
1faed8ae PE |
826 | Lisp_Object tem1 = Fcar (tail); |
827 | if (! (CONSP (tem1) | |
828 | && EQ (XCAR (tem1), Qquote) | |
829 | && CONSP (XCDR (tem1)) | |
830 | && EQ (XCAR (XCDR (tem1)), sym))) | |
1c9916a1 SM |
831 | error ("Constant symbol `%s' specified in defvar", |
832 | SDATA (SYMBOL_NAME (sym))); | |
833 | } | |
834 | ||
265a9e55 | 835 | if (NILP (tem)) |
defb1411 | 836 | Fset_default (sym, eval_sub (Fcar (tail))); |
d0bce91e SM |
837 | else |
838 | { /* Check if there is really a global binding rather than just a let | |
839 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 840 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
841 | while (--pdl >= specpdl) |
842 | { | |
843 | if (EQ (pdl->symbol, sym) && !pdl->func | |
844 | && EQ (pdl->old_value, Qunbound)) | |
845 | { | |
846 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
847 | SYMBOL_NAME (sym), 1); | |
848 | break; | |
849 | } | |
850 | } | |
851 | } | |
33568849 | 852 | tail = Fcdr (tail); |
e509f168 SM |
853 | tem = Fcar (tail); |
854 | if (!NILP (tem)) | |
33568849 | 855 | { |
33568849 SM |
856 | if (!NILP (Vpurify_flag)) |
857 | tem = Fpurecopy (tem); | |
858 | Fput (sym, Qvariable_documentation, tem); | |
859 | } | |
6fd797f5 | 860 | LOADHIST_ATTACH (sym); |
db9f0278 | 861 | } |
f07a954e SM |
862 | else if (!NILP (Vinternal_interpreter_environment) |
863 | && !XSYMBOL (sym)->declared_special) | |
864 | /* A simple (defvar foo) with lexical scoping does "nothing" except | |
865 | declare that var to be dynamically scoped *locally* (i.e. within | |
866 | the current file or let-block). */ | |
867 | Vinternal_interpreter_environment = | |
868 | Fcons (sym, Vinternal_interpreter_environment); | |
33568849 | 869 | else |
d28a2170 PE |
870 | { |
871 | /* Simple (defvar <var>) should not count as a definition at all. | |
872 | It could get in the way of other definitions, and unloading this | |
873 | package could try to make the variable unbound. */ | |
874 | } | |
addf35fd | 875 | |
db9f0278 JB |
876 | return sym; |
877 | } | |
878 | ||
879 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
880 | doc: /* Define SYMBOL as a constant variable. |
881 | The intent is that neither programs nor users should ever change this value. | |
882 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
883 | If SYMBOL is buffer-local, its default value is what is set; | |
884 | buffer-local values are not affected. | |
885 | DOCSTRING is optional. | |
733f68b6 LT |
886 | |
887 | If SYMBOL has a local binding, then this form sets the local binding's | |
888 | value. However, you should normally not make local bindings for | |
889 | variables defined with this form. | |
7a25dc6d | 890 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 891 | (Lisp_Object args) |
db9f0278 JB |
892 | { |
893 | register Lisp_Object sym, tem; | |
894 | ||
895 | sym = Fcar (args); | |
a42ba017 | 896 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 897 | error ("Too many arguments"); |
a42ba017 | 898 | |
defb1411 | 899 | tem = eval_sub (Fcar (Fcdr (args))); |
1182a7cb DL |
900 | if (!NILP (Vpurify_flag)) |
901 | tem = Fpurecopy (tem); | |
902 | Fset_default (sym, tem); | |
b9598260 | 903 | XSYMBOL (sym)->declared_special = 1; |
db9f0278 | 904 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 905 | if (!NILP (tem)) |
db9f0278 | 906 | { |
265a9e55 | 907 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
908 | tem = Fpurecopy (tem); |
909 | Fput (sym, Qvariable_documentation, tem); | |
910 | } | |
873759d5 | 911 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 912 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
913 | return sym; |
914 | } | |
915 | ||
606cdb89 JB |
916 | /* Error handler used in Fuser_variable_p. */ |
917 | static Lisp_Object | |
d3da34e0 | 918 | user_variable_p_eh (Lisp_Object ignore) |
606cdb89 JB |
919 | { |
920 | return Qnil; | |
921 | } | |
922 | ||
40a69fac SM |
923 | static Lisp_Object |
924 | lisp_indirect_variable (Lisp_Object sym) | |
925 | { | |
cfcbfb1a PE |
926 | struct Lisp_Symbol *s = indirect_variable (XSYMBOL (sym)); |
927 | XSETSYMBOL (sym, s); | |
40a69fac SM |
928 | return sym; |
929 | } | |
930 | ||
db9f0278 | 931 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 932 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 933 | \(The alternative is a variable used internally in a Lisp program.) |
606cdb89 JB |
934 | A variable is a user variable if |
935 | \(1) the first character of its documentation is `*', or | |
936 | \(2) it is customizable (its property list contains a non-nil value | |
937 | of `standard-value' or `custom-autoload'), or | |
938 | \(3) it is an alias for another user variable. | |
939 | Return nil if VARIABLE is an alias and there is a loop in the | |
940 | chain of symbols. */) | |
5842a27b | 941 | (Lisp_Object variable) |
db9f0278 JB |
942 | { |
943 | Lisp_Object documentation; | |
177c0ea7 | 944 | |
5e78e475 RS |
945 | if (!SYMBOLP (variable)) |
946 | return Qnil; | |
947 | ||
606cdb89 | 948 | /* If indirect and there's an alias loop, don't check anything else. */ |
ce5b453a | 949 | if (XSYMBOL (variable)->redirect == SYMBOL_VARALIAS |
40a69fac | 950 | && NILP (internal_condition_case_1 (lisp_indirect_variable, variable, |
bb8e180f | 951 | Qt, user_variable_p_eh))) |
606cdb89 JB |
952 | return Qnil; |
953 | ||
954 | while (1) | |
955 | { | |
956 | documentation = Fget (variable, Qvariable_documentation); | |
957 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
bb8e180f | 958 | return Qt; |
606cdb89 | 959 | if (STRINGP (documentation) |
bb8e180f AS |
960 | && ((unsigned char) SREF (documentation, 0) == '*')) |
961 | return Qt; | |
606cdb89 JB |
962 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ |
963 | if (CONSP (documentation) | |
bb8e180f AS |
964 | && STRINGP (XCAR (documentation)) |
965 | && INTEGERP (XCDR (documentation)) | |
966 | && XINT (XCDR (documentation)) < 0) | |
967 | return Qt; | |
606cdb89 JB |
968 | /* Customizable? See `custom-variable-p'. */ |
969 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
bb8e180f AS |
970 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) |
971 | return Qt; | |
606cdb89 | 972 | |
ce5b453a | 973 | if (!(XSYMBOL (variable)->redirect == SYMBOL_VARALIAS)) |
bb8e180f | 974 | return Qnil; |
606cdb89 JB |
975 | |
976 | /* An indirect variable? Let's follow the chain. */ | |
ce5b453a | 977 | XSETSYMBOL (variable, SYMBOL_ALIAS (XSYMBOL (variable))); |
606cdb89 | 978 | } |
177c0ea7 | 979 | } |
db9f0278 JB |
980 | \f |
981 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
982 | doc: /* Bind variables according to VARLIST then eval BODY. |
983 | The value of the last form in BODY is returned. | |
984 | Each element of VARLIST is a symbol (which is bound to nil) | |
985 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
986 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 987 | usage: (let* VARLIST BODY...) */) |
5842a27b | 988 | (Lisp_Object args) |
db9f0278 | 989 | { |
b9598260 | 990 | Lisp_Object varlist, var, val, elt, lexenv; |
aed13378 | 991 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
992 | struct gcpro gcpro1, gcpro2, gcpro3; |
993 | ||
994 | GCPRO3 (args, elt, varlist); | |
995 | ||
b9598260 SM |
996 | lexenv = Vinternal_interpreter_environment; |
997 | ||
db9f0278 | 998 | varlist = Fcar (args); |
b9598260 | 999 | while (CONSP (varlist)) |
db9f0278 JB |
1000 | { |
1001 | QUIT; | |
b9598260 SM |
1002 | |
1003 | elt = XCAR (varlist); | |
90165123 | 1004 | if (SYMBOLP (elt)) |
b9598260 SM |
1005 | { |
1006 | var = elt; | |
1007 | val = Qnil; | |
1008 | } | |
08564963 | 1009 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1010 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1011 | else |
1012 | { | |
b9598260 | 1013 | var = Fcar (elt); |
defb1411 | 1014 | val = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 | 1015 | } |
b9598260 | 1016 | |
f07a954e SM |
1017 | if (!NILP (lexenv) && SYMBOLP (var) |
1018 | && !XSYMBOL (var)->declared_special | |
1019 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
1020 | /* Lexically bind VAR by adding it to the interpreter's binding |
1021 | alist. */ | |
1022 | { | |
f07a954e SM |
1023 | Lisp_Object newenv |
1024 | = Fcons (Fcons (var, val), Vinternal_interpreter_environment); | |
1025 | if (EQ (Vinternal_interpreter_environment, lexenv)) | |
1026 | /* Save the old lexical environment on the specpdl stack, | |
1027 | but only for the first lexical binding, since we'll never | |
1028 | need to revert to one of the intermediate ones. */ | |
1029 | specbind (Qinternal_interpreter_environment, newenv); | |
1030 | else | |
1031 | Vinternal_interpreter_environment = newenv; | |
db9f0278 | 1032 | } |
b9598260 SM |
1033 | else |
1034 | specbind (var, val); | |
1035 | ||
1036 | varlist = XCDR (varlist); | |
db9f0278 JB |
1037 | } |
1038 | UNGCPRO; | |
1039 | val = Fprogn (Fcdr (args)); | |
1040 | return unbind_to (count, val); | |
1041 | } | |
1042 | ||
1043 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1044 | doc: /* Bind variables according to VARLIST then eval BODY. |
1045 | The value of the last form in BODY is returned. | |
1046 | Each element of VARLIST is a symbol (which is bound to nil) | |
1047 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1048 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 1049 | usage: (let VARLIST BODY...) */) |
5842a27b | 1050 | (Lisp_Object args) |
db9f0278 | 1051 | { |
b9598260 | 1052 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 1053 | register Lisp_Object elt, varlist; |
aed13378 | 1054 | int count = SPECPDL_INDEX (); |
f66c7cf8 | 1055 | ptrdiff_t argnum; |
db9f0278 | 1056 | struct gcpro gcpro1, gcpro2; |
3a7a9129 | 1057 | USE_SAFE_ALLOCA; |
db9f0278 JB |
1058 | |
1059 | varlist = Fcar (args); | |
1060 | ||
f6d62986 | 1061 | /* Make space to hold the values to give the bound variables. */ |
db9f0278 | 1062 | elt = Flength (varlist); |
b72e0717 | 1063 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 | 1064 | |
f6d62986 | 1065 | /* Compute the values and store them in `temps'. */ |
db9f0278 JB |
1066 | |
1067 | GCPRO2 (args, *temps); | |
1068 | gcpro2.nvars = 0; | |
1069 | ||
67ee9f6e | 1070 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
1071 | { |
1072 | QUIT; | |
67ee9f6e | 1073 | elt = XCAR (varlist); |
90165123 | 1074 | if (SYMBOLP (elt)) |
db9f0278 | 1075 | temps [argnum++] = Qnil; |
08564963 | 1076 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1077 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 | 1078 | else |
defb1411 | 1079 | temps [argnum++] = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 JB |
1080 | gcpro2.nvars = argnum; |
1081 | } | |
1082 | UNGCPRO; | |
1083 | ||
b9598260 SM |
1084 | lexenv = Vinternal_interpreter_environment; |
1085 | ||
db9f0278 | 1086 | varlist = Fcar (args); |
67ee9f6e | 1087 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 1088 | { |
b9598260 SM |
1089 | Lisp_Object var; |
1090 | ||
67ee9f6e | 1091 | elt = XCAR (varlist); |
b9598260 | 1092 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 1093 | tem = temps[argnum++]; |
b9598260 | 1094 | |
f07a954e SM |
1095 | if (!NILP (lexenv) && SYMBOLP (var) |
1096 | && !XSYMBOL (var)->declared_special | |
1097 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
1098 | /* Lexically bind VAR by adding it to the lexenv alist. */ |
1099 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 1100 | else |
b9598260 SM |
1101 | /* Dynamically bind VAR. */ |
1102 | specbind (var, tem); | |
db9f0278 JB |
1103 | } |
1104 | ||
b9598260 SM |
1105 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
1106 | /* Instantiate a new lexical environment. */ | |
1107 | specbind (Qinternal_interpreter_environment, lexenv); | |
1108 | ||
db9f0278 | 1109 | elt = Fprogn (Fcdr (args)); |
3a7a9129 | 1110 | SAFE_FREE (); |
db9f0278 JB |
1111 | return unbind_to (count, elt); |
1112 | } | |
1113 | ||
1114 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1115 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1116 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1117 | until TEST returns nil. | |
7a25dc6d | 1118 | usage: (while TEST BODY...) */) |
5842a27b | 1119 | (Lisp_Object args) |
db9f0278 | 1120 | { |
2b9bde76 | 1121 | Lisp_Object test, body; |
db9f0278 JB |
1122 | struct gcpro gcpro1, gcpro2; |
1123 | ||
1124 | GCPRO2 (test, body); | |
1125 | ||
1126 | test = Fcar (args); | |
1127 | body = Fcdr (args); | |
defb1411 | 1128 | while (!NILP (eval_sub (test))) |
db9f0278 JB |
1129 | { |
1130 | QUIT; | |
1131 | Fprogn (body); | |
1132 | } | |
1133 | ||
1134 | UNGCPRO; | |
1135 | return Qnil; | |
1136 | } | |
1137 | ||
1138 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1139 | doc: /* Return result of expanding macros at top level of FORM. |
1140 | If FORM is not a macro call, it is returned unchanged. | |
1141 | Otherwise, the macro is expanded and the expansion is considered | |
1142 | in place of FORM. When a non-macro-call results, it is returned. | |
1143 | ||
1144 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1145 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 1146 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 1147 | { |
23d6b5a6 | 1148 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1149 | register Lisp_Object expander, sym, def, tem; |
1150 | ||
1151 | while (1) | |
1152 | { | |
1153 | /* Come back here each time we expand a macro call, | |
1154 | in case it expands into another macro call. */ | |
90165123 | 1155 | if (!CONSP (form)) |
db9f0278 | 1156 | break; |
23d6b5a6 | 1157 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1158 | def = sym = XCAR (form); |
23d6b5a6 | 1159 | tem = Qnil; |
db9f0278 JB |
1160 | /* Trace symbols aliases to other symbols |
1161 | until we get a symbol that is not an alias. */ | |
90165123 | 1162 | while (SYMBOLP (def)) |
db9f0278 JB |
1163 | { |
1164 | QUIT; | |
23d6b5a6 | 1165 | sym = def; |
79e8bfbf | 1166 | tem = Fassq (sym, environment); |
265a9e55 | 1167 | if (NILP (tem)) |
db9f0278 JB |
1168 | { |
1169 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1170 | if (!EQ (def, Qunbound)) |
1171 | continue; | |
db9f0278 | 1172 | } |
23d6b5a6 | 1173 | break; |
db9f0278 | 1174 | } |
79e8bfbf | 1175 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1176 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1177 | if (NILP (tem)) |
db9f0278 | 1178 | { |
79e8bfbf | 1179 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1180 | Look at its function definition. */ |
90165123 | 1181 | if (EQ (def, Qunbound) || !CONSP (def)) |
f6d62986 | 1182 | /* Not defined or definition not suitable. */ |
db9f0278 | 1183 | break; |
03699b14 | 1184 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1185 | { |
1186 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1187 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1188 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1189 | /* Yes, load it and try again. */ |
1190 | { | |
ca20916b RS |
1191 | struct gcpro gcpro1; |
1192 | GCPRO1 (form); | |
ee9ee63c | 1193 | do_autoload (def, sym); |
ca20916b | 1194 | UNGCPRO; |
ee9ee63c JB |
1195 | continue; |
1196 | } | |
1197 | else | |
db9f0278 | 1198 | break; |
db9f0278 | 1199 | } |
03699b14 | 1200 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1201 | break; |
03699b14 | 1202 | else expander = XCDR (def); |
db9f0278 JB |
1203 | } |
1204 | else | |
1205 | { | |
03699b14 | 1206 | expander = XCDR (tem); |
265a9e55 | 1207 | if (NILP (expander)) |
db9f0278 JB |
1208 | break; |
1209 | } | |
03699b14 | 1210 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1211 | } |
1212 | return form; | |
1213 | } | |
1214 | \f | |
1215 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1216 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1217 | TAG is evalled to get the tag to use; it must not be nil. | |
1218 | ||
1219 | Then the BODY is executed. | |
1d632ccf | 1220 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1221 | If no throw happens, `catch' returns the value of the last BODY form. |
1222 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1223 | usage: (catch TAG BODY...) */) |
5842a27b | 1224 | (Lisp_Object args) |
db9f0278 JB |
1225 | { |
1226 | register Lisp_Object tag; | |
1227 | struct gcpro gcpro1; | |
1228 | ||
1229 | GCPRO1 (args); | |
defb1411 | 1230 | tag = eval_sub (Fcar (args)); |
db9f0278 JB |
1231 | UNGCPRO; |
1232 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1233 | } | |
1234 | ||
1235 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1236 | FUNC should return a Lisp_Object. | |
1237 | This is how catches are done from within C code. */ | |
1238 | ||
1239 | Lisp_Object | |
d3da34e0 | 1240 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1241 | { |
1242 | /* This structure is made part of the chain `catchlist'. */ | |
1243 | struct catchtag c; | |
1244 | ||
1245 | /* Fill in the components of c, and put it on the list. */ | |
1246 | c.next = catchlist; | |
1247 | c.tag = tag; | |
1248 | c.val = Qnil; | |
1249 | c.backlist = backtrace_list; | |
1250 | c.handlerlist = handlerlist; | |
1251 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1252 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1253 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1254 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1255 | c.gcpro = gcprolist; |
bcf28080 | 1256 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1257 | catchlist = &c; |
1258 | ||
1259 | /* Call FUNC. */ | |
1260 | if (! _setjmp (c.jmp)) | |
1261 | c.val = (*func) (arg); | |
1262 | ||
1263 | /* Throw works by a longjmp that comes right here. */ | |
1264 | catchlist = c.next; | |
1265 | return c.val; | |
1266 | } | |
1267 | ||
ba410f40 JB |
1268 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1269 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1270 | |
ba410f40 JB |
1271 | This is the guts Fthrow and Fsignal; they differ only in the way |
1272 | they choose the catch tag to throw to. A catch tag for a | |
1273 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1274 | |
ba410f40 JB |
1275 | Before each catch is discarded, unbind all special bindings and |
1276 | execute all unwind-protect clauses made above that catch. Unwind | |
1277 | the handler stack as we go, so that the proper handlers are in | |
1278 | effect for each unwind-protect clause we run. At the end, restore | |
1279 | some static info saved in CATCH, and longjmp to the location | |
1280 | specified in the | |
1281 | ||
1282 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1283 | |
1284 | static void | |
d3da34e0 | 1285 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 JB |
1286 | { |
1287 | register int last_time; | |
1288 | ||
ba410f40 JB |
1289 | /* Save the value in the tag. */ |
1290 | catch->val = value; | |
1291 | ||
0b31741c | 1292 | /* Restore certain special C variables. */ |
1cdc3155 | 1293 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1294 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1295 | handling_signal = 0; |
69bbd6bd | 1296 | immediate_quit = 0; |
82da7701 | 1297 | |
db9f0278 JB |
1298 | do |
1299 | { | |
1300 | last_time = catchlist == catch; | |
82da7701 JB |
1301 | |
1302 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1303 | handlers. */ |
db9f0278 JB |
1304 | unbind_to (catchlist->pdlcount, Qnil); |
1305 | handlerlist = catchlist->handlerlist; | |
1306 | catchlist = catchlist->next; | |
1307 | } | |
1308 | while (! last_time); | |
1309 | ||
a2a103bb | 1310 | #if HAVE_X_WINDOWS |
88019a63 RS |
1311 | /* If x_catch_errors was done, turn it off now. |
1312 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 | 1313 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
bb8e180f AS |
1314 | The catch must remain in effect during that delicate |
1315 | state. --lorentey */ | |
88019a63 | 1316 | x_fully_uncatch_errors (); |
e6aee454 | 1317 | #endif |
a2a103bb | 1318 | #endif |
88019a63 | 1319 | |
bcf28080 | 1320 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1321 | gcprolist = catch->gcpro; |
15934ffa | 1322 | #ifdef DEBUG_GCPRO |
d8e2b5ba | 1323 | gcpro_level = gcprolist ? gcprolist->level + 1 : 0; |
15934ffa | 1324 | #endif |
db9f0278 JB |
1325 | backtrace_list = catch->backlist; |
1326 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1327 | |
ba410f40 | 1328 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1329 | } |
1330 | ||
a7ca3326 | 1331 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, |
9dbc9081 PJ |
1332 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1333 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1334 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1335 | { |
1336 | register struct catchtag *c; | |
1337 | ||
8788120f KS |
1338 | if (!NILP (tag)) |
1339 | for (c = catchlist; c; c = c->next) | |
1340 | { | |
1341 | if (EQ (c->tag, tag)) | |
1342 | unwind_to_catch (c, value); | |
1343 | } | |
734d55a2 | 1344 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1345 | } |
1346 | ||
1347 | ||
1348 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1349 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1350 | If BODYFORM completes normally, its value is returned | |
1351 | after executing the UNWINDFORMS. | |
1352 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1353 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1354 | (Lisp_Object args) |
db9f0278 JB |
1355 | { |
1356 | Lisp_Object val; | |
aed13378 | 1357 | int count = SPECPDL_INDEX (); |
db9f0278 | 1358 | |
04b28167 | 1359 | record_unwind_protect (Fprogn, Fcdr (args)); |
defb1411 | 1360 | val = eval_sub (Fcar (args)); |
177c0ea7 | 1361 | return unbind_to (count, val); |
db9f0278 JB |
1362 | } |
1363 | \f | |
db9f0278 | 1364 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, |
9dbc9081 | 1365 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1366 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1367 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1368 | where the BODY is made of Lisp expressions. | |
1369 | ||
1370 | A handler is applicable to an error | |
1371 | if CONDITION-NAME is one of the error's condition names. | |
1372 | If an error happens, the first applicable handler is run. | |
1373 | ||
1374 | The car of a handler may be a list of condition names | |
c997bb25 | 1375 | instead of a single condition name. Then it handles all of them. |
9dbc9081 | 1376 | |
c997bb25 RS |
1377 | When a handler handles an error, control returns to the `condition-case' |
1378 | and it executes the handler's BODY... | |
d0acbbaf | 1379 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1380 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1381 | Then the value of the last BODY form is returned from the `condition-case' |
1382 | expression. | |
9dbc9081 | 1383 | |
9dbc9081 | 1384 | See also the function `signal' for more info. |
2b47b74d | 1385 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1386 | (Lisp_Object args) |
db9f0278 | 1387 | { |
17401c97 GM |
1388 | register Lisp_Object bodyform, handlers; |
1389 | volatile Lisp_Object var; | |
db9f0278 | 1390 | |
82da7701 JB |
1391 | var = Fcar (args); |
1392 | bodyform = Fcar (Fcdr (args)); | |
1393 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1394 | |
1395 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1396 | } | |
1397 | ||
1398 | /* Like Fcondition_case, but the args are separate | |
1399 | rather than passed in a list. Used by Fbyte_code. */ | |
1400 | ||
1401 | Lisp_Object | |
d3da34e0 JB |
1402 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1403 | Lisp_Object handlers) | |
ee830945 RS |
1404 | { |
1405 | Lisp_Object val; | |
1406 | struct catchtag c; | |
1407 | struct handler h; | |
1408 | ||
b7826503 | 1409 | CHECK_SYMBOL (var); |
82da7701 | 1410 | |
2b47b74d | 1411 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1412 | { |
1413 | Lisp_Object tem; | |
2b47b74d | 1414 | tem = XCAR (val); |
5f96776a RS |
1415 | if (! (NILP (tem) |
1416 | || (CONSP (tem) | |
03699b14 KR |
1417 | && (SYMBOLP (XCAR (tem)) |
1418 | || CONSP (XCAR (tem)))))) | |
e6c3da20 EZ |
1419 | error ("Invalid condition handler: %s", |
1420 | SDATA (Fprin1_to_string (tem, Qt))); | |
82da7701 | 1421 | } |
db9f0278 JB |
1422 | |
1423 | c.tag = Qnil; | |
1424 | c.val = Qnil; | |
1425 | c.backlist = backtrace_list; | |
1426 | c.handlerlist = handlerlist; | |
1427 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1428 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1429 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1430 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1431 | c.gcpro = gcprolist; |
bcf28080 | 1432 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1433 | if (_setjmp (c.jmp)) |
1434 | { | |
265a9e55 | 1435 | if (!NILP (h.var)) |
bb8e180f | 1436 | specbind (h.var, c.val); |
9d58218c | 1437 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1438 | |
1439 | /* Note that this just undoes the binding of h.var; whoever | |
1440 | longjumped to us unwound the stack to c.pdlcount before | |
1441 | throwing. */ | |
db9f0278 JB |
1442 | unbind_to (c.pdlcount, Qnil); |
1443 | return val; | |
1444 | } | |
1445 | c.next = catchlist; | |
1446 | catchlist = &c; | |
177c0ea7 | 1447 | |
82da7701 JB |
1448 | h.var = var; |
1449 | h.handler = handlers; | |
db9f0278 | 1450 | h.next = handlerlist; |
db9f0278 JB |
1451 | h.tag = &c; |
1452 | handlerlist = &h; | |
1453 | ||
defb1411 | 1454 | val = eval_sub (bodyform); |
db9f0278 JB |
1455 | catchlist = c.next; |
1456 | handlerlist = h.next; | |
1457 | return val; | |
1458 | } | |
1459 | ||
f029ca5f RS |
1460 | /* Call the function BFUN with no arguments, catching errors within it |
1461 | according to HANDLERS. If there is an error, call HFUN with | |
1462 | one argument which is the data that describes the error: | |
1463 | (SIGNALNAME . DATA) | |
1464 | ||
1465 | HANDLERS can be a list of conditions to catch. | |
1466 | If HANDLERS is Qt, catch all errors. | |
1467 | If HANDLERS is Qerror, catch all errors | |
1468 | but allow the debugger to run if that is enabled. */ | |
1469 | ||
db9f0278 | 1470 | Lisp_Object |
d3da34e0 JB |
1471 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1472 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1473 | { |
1474 | Lisp_Object val; | |
1475 | struct catchtag c; | |
1476 | struct handler h; | |
1477 | ||
88019a63 RS |
1478 | /* Since Fsignal will close off all calls to x_catch_errors, |
1479 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1480 | #if HAVE_X_WINDOWS |
88019a63 | 1481 | if (x_catching_errors ()) |
01591d17 | 1482 | abort (); |
a2a103bb | 1483 | #endif |
01591d17 | 1484 | |
db9f0278 JB |
1485 | c.tag = Qnil; |
1486 | c.val = Qnil; | |
1487 | c.backlist = backtrace_list; | |
1488 | c.handlerlist = handlerlist; | |
1489 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1490 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1491 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1492 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1493 | c.gcpro = gcprolist; |
bcf28080 | 1494 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1495 | if (_setjmp (c.jmp)) |
1496 | { | |
9d58218c | 1497 | return (*hfun) (c.val); |
db9f0278 JB |
1498 | } |
1499 | c.next = catchlist; | |
1500 | catchlist = &c; | |
1501 | h.handler = handlers; | |
1502 | h.var = Qnil; | |
db9f0278 JB |
1503 | h.next = handlerlist; |
1504 | h.tag = &c; | |
1505 | handlerlist = &h; | |
1506 | ||
1507 | val = (*bfun) (); | |
1508 | catchlist = c.next; | |
1509 | handlerlist = h.next; | |
1510 | return val; | |
1511 | } | |
1512 | ||
2659a09f | 1513 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1514 | |
d227775c | 1515 | Lisp_Object |
d3da34e0 JB |
1516 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1517 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1518 | { |
1519 | Lisp_Object val; | |
1520 | struct catchtag c; | |
1521 | struct handler h; | |
1522 | ||
88019a63 RS |
1523 | /* Since Fsignal will close off all calls to x_catch_errors, |
1524 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1525 | #if HAVE_X_WINDOWS |
88019a63 RS |
1526 | if (x_catching_errors ()) |
1527 | abort (); | |
a2a103bb | 1528 | #endif |
88019a63 | 1529 | |
d227775c RS |
1530 | c.tag = Qnil; |
1531 | c.val = Qnil; | |
1532 | c.backlist = backtrace_list; | |
1533 | c.handlerlist = handlerlist; | |
1534 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1535 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1536 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1537 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1538 | c.gcpro = gcprolist; |
bcf28080 | 1539 | c.byte_stack = byte_stack_list; |
d227775c RS |
1540 | if (_setjmp (c.jmp)) |
1541 | { | |
9d58218c | 1542 | return (*hfun) (c.val); |
d227775c RS |
1543 | } |
1544 | c.next = catchlist; | |
1545 | catchlist = &c; | |
1546 | h.handler = handlers; | |
1547 | h.var = Qnil; | |
1548 | h.next = handlerlist; | |
1549 | h.tag = &c; | |
1550 | handlerlist = &h; | |
1551 | ||
1552 | val = (*bfun) (arg); | |
1553 | catchlist = c.next; | |
1554 | handlerlist = h.next; | |
1555 | return val; | |
1556 | } | |
10b29d41 | 1557 | |
53967e09 CY |
1558 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1559 | its arguments. */ | |
1560 | ||
1561 | Lisp_Object | |
178f2507 SM |
1562 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1563 | Lisp_Object arg1, | |
1564 | Lisp_Object arg2, | |
1565 | Lisp_Object handlers, | |
1566 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1567 | { |
1568 | Lisp_Object val; | |
1569 | struct catchtag c; | |
1570 | struct handler h; | |
1571 | ||
1572 | /* Since Fsignal will close off all calls to x_catch_errors, | |
1573 | we will get the wrong results if some are not closed now. */ | |
1574 | #if HAVE_X_WINDOWS | |
1575 | if (x_catching_errors ()) | |
1576 | abort (); | |
1577 | #endif | |
1578 | ||
1579 | c.tag = Qnil; | |
1580 | c.val = Qnil; | |
1581 | c.backlist = backtrace_list; | |
1582 | c.handlerlist = handlerlist; | |
1583 | c.lisp_eval_depth = lisp_eval_depth; | |
1584 | c.pdlcount = SPECPDL_INDEX (); | |
1585 | c.poll_suppress_count = poll_suppress_count; | |
1586 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1587 | c.gcpro = gcprolist; | |
1588 | c.byte_stack = byte_stack_list; | |
1589 | if (_setjmp (c.jmp)) | |
1590 | { | |
1591 | return (*hfun) (c.val); | |
1592 | } | |
1593 | c.next = catchlist; | |
1594 | catchlist = &c; | |
1595 | h.handler = handlers; | |
1596 | h.var = Qnil; | |
1597 | h.next = handlerlist; | |
1598 | h.tag = &c; | |
1599 | handlerlist = &h; | |
1600 | ||
1601 | val = (*bfun) (arg1, arg2); | |
1602 | catchlist = c.next; | |
1603 | handlerlist = h.next; | |
1604 | return val; | |
1605 | } | |
10b29d41 | 1606 | |
2659a09f | 1607 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1608 | and ARGS as second argument. */ |
1609 | ||
1610 | Lisp_Object | |
f66c7cf8 PE |
1611 | internal_condition_case_n (Lisp_Object (*bfun) (ptrdiff_t, Lisp_Object *), |
1612 | ptrdiff_t nargs, | |
178f2507 SM |
1613 | Lisp_Object *args, |
1614 | Lisp_Object handlers, | |
1615 | Lisp_Object (*hfun) (Lisp_Object)) | |
10b29d41 GM |
1616 | { |
1617 | Lisp_Object val; | |
1618 | struct catchtag c; | |
1619 | struct handler h; | |
1620 | ||
88019a63 RS |
1621 | /* Since Fsignal will close off all calls to x_catch_errors, |
1622 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1623 | #if HAVE_X_WINDOWS |
88019a63 RS |
1624 | if (x_catching_errors ()) |
1625 | abort (); | |
a2a103bb | 1626 | #endif |
88019a63 | 1627 | |
10b29d41 GM |
1628 | c.tag = Qnil; |
1629 | c.val = Qnil; | |
1630 | c.backlist = backtrace_list; | |
1631 | c.handlerlist = handlerlist; | |
1632 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1633 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1634 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1635 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1636 | c.gcpro = gcprolist; |
1637 | c.byte_stack = byte_stack_list; | |
1638 | if (_setjmp (c.jmp)) | |
1639 | { | |
1640 | return (*hfun) (c.val); | |
1641 | } | |
1642 | c.next = catchlist; | |
1643 | catchlist = &c; | |
1644 | h.handler = handlers; | |
1645 | h.var = Qnil; | |
1646 | h.next = handlerlist; | |
1647 | h.tag = &c; | |
1648 | handlerlist = &h; | |
1649 | ||
1650 | val = (*bfun) (nargs, args); | |
1651 | catchlist = c.next; | |
1652 | handlerlist = h.next; | |
1653 | return val; | |
1654 | } | |
1655 | ||
d227775c | 1656 | \f |
f57e2426 | 1657 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object, |
bb8e180f | 1658 | Lisp_Object, Lisp_Object); |
e7f7fbaa SM |
1659 | static int maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1660 | Lisp_Object data); | |
db9f0278 | 1661 | |
a7ca3326 | 1662 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, |
9dbc9081 PJ |
1663 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1664 | This function does not return. | |
1665 | ||
1666 | An error symbol is a symbol with an `error-conditions' property | |
1667 | that is a list of condition names. | |
1668 | A handler for any of those names will get to handle this signal. | |
1669 | The symbol `error' should normally be one of them. | |
1670 | ||
1671 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1672 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1673 | error message is constructed. | |
9dbc9081 PJ |
1674 | If the signal is handled, DATA is made available to the handler. |
1675 | See also the function `condition-case'. */) | |
5842a27b | 1676 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1677 | { |
bfa8ca43 | 1678 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1679 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1680 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1681 | Lisp_Object conditions; |
c11d3d17 | 1682 | Lisp_Object string; |
e7f7fbaa SM |
1683 | Lisp_Object real_error_symbol |
1684 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1685 | register Lisp_Object clause = Qnil; | |
1686 | struct handler *h; | |
a2ff3819 | 1687 | struct backtrace *bp; |
db9f0278 | 1688 | |
346598f1 | 1689 | immediate_quit = handling_signal = 0; |
d063129f | 1690 | abort_on_gc = 0; |
db9f0278 JB |
1691 | if (gc_in_progress || waiting_for_input) |
1692 | abort (); | |
1693 | ||
26631f2b RS |
1694 | #if 0 /* rms: I don't know why this was here, |
1695 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1696 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1697 | if (display_hourglass_p) |
1698 | cancel_hourglass (); | |
48f8dfa3 | 1699 | #endif |
177c0ea7 | 1700 | #endif |
48f8dfa3 | 1701 | |
61ede770 | 1702 | /* This hook is used by edebug. */ |
26631f2b RS |
1703 | if (! NILP (Vsignal_hook_function) |
1704 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1705 | { |
1706 | /* Edebug takes care of restoring these variables when it exits. */ | |
1707 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1708 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1709 | ||
1710 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1711 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1712 | ||
1713 | call2 (Vsignal_hook_function, error_symbol, data); | |
1714 | } | |
61ede770 | 1715 | |
1ea9dec4 | 1716 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1717 | |
a2ff3819 GM |
1718 | /* Remember from where signal was called. Skip over the frame for |
1719 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1720 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1721 | is a memory-full error. */ | |
090a072f | 1722 | Vsignaling_function = Qnil; |
26631f2b | 1723 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1724 | { |
1725 | bp = backtrace_list->next; | |
1726 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1727 | bp = bp->next; | |
1728 | if (bp && bp->function) | |
1729 | Vsignaling_function = *bp->function; | |
1730 | } | |
a2ff3819 | 1731 | |
e7f7fbaa | 1732 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1733 | { |
e7f7fbaa | 1734 | clause = find_handler_clause (h->handler, conditions, |
f01cbfdd | 1735 | error_symbol, data); |
265a9e55 | 1736 | if (!NILP (clause)) |
e7f7fbaa | 1737 | break; |
db9f0278 | 1738 | } |
475545b5 | 1739 | |
e7f7fbaa SM |
1740 | if (/* Don't run the debugger for a memory-full error. |
1741 | (There is no room in memory to do that!) */ | |
1742 | !NILP (error_symbol) | |
1743 | && (!NILP (Vdebug_on_signal) | |
1744 | /* If no handler is present now, try to run the debugger. */ | |
1745 | || NILP (clause) | |
1746 | /* Special handler that means "print a message and run debugger | |
1747 | if requested". */ | |
1748 | || EQ (h->handler, Qerror))) | |
1749 | { | |
1750 | int debugger_called | |
1751 | = maybe_call_debugger (conditions, error_symbol, data); | |
1752 | /* We can't return values to code which signaled an error, but we | |
1753 | can continue code which has signaled a quit. */ | |
1754 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
1755 | return Qnil; | |
475545b5 | 1756 | } |
db9f0278 | 1757 | |
e7f7fbaa SM |
1758 | if (!NILP (clause)) |
1759 | { | |
1760 | Lisp_Object unwind_data | |
1761 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 1762 | |
e7f7fbaa SM |
1763 | h->chosen_clause = clause; |
1764 | unwind_to_catch (h->tag, unwind_data); | |
1765 | } | |
1766 | else | |
1767 | { | |
1768 | if (catchlist != 0) | |
1769 | Fthrow (Qtop_level, Qt); | |
1770 | } | |
c11d3d17 | 1771 | |
1ea9dec4 | 1772 | if (! NILP (error_symbol)) |
c11d3d17 | 1773 | data = Fcons (error_symbol, data); |
475545b5 | 1774 | |
c11d3d17 | 1775 | string = Ferror_message_string (data); |
583f48b9 | 1776 | fatal ("%s", SDATA (string)); |
db9f0278 JB |
1777 | } |
1778 | ||
734d55a2 KS |
1779 | /* Internal version of Fsignal that never returns. |
1780 | Used for anything but Qquit (which can return from Fsignal). */ | |
1781 | ||
1782 | void | |
d3da34e0 | 1783 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1784 | { |
1785 | Fsignal (error_symbol, data); | |
1786 | abort (); | |
1787 | } | |
1788 | ||
1789 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1790 | ||
1791 | void | |
d3da34e0 | 1792 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1793 | { |
1794 | xsignal (error_symbol, Qnil); | |
1795 | } | |
1796 | ||
1797 | void | |
d3da34e0 | 1798 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1799 | { |
1800 | xsignal (error_symbol, list1 (arg)); | |
1801 | } | |
1802 | ||
1803 | void | |
d3da34e0 | 1804 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1805 | { |
1806 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1807 | } | |
1808 | ||
1809 | void | |
d3da34e0 | 1810 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1811 | { |
1812 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1813 | } | |
1814 | ||
1815 | /* Signal `error' with message S, and additional arg ARG. | |
1816 | If ARG is not a genuine list, make it a one-element list. */ | |
1817 | ||
1818 | void | |
a8fe7202 | 1819 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1820 | { |
1821 | Lisp_Object tortoise, hare; | |
1822 | ||
1823 | hare = tortoise = arg; | |
1824 | while (CONSP (hare)) | |
1825 | { | |
1826 | hare = XCDR (hare); | |
1827 | if (!CONSP (hare)) | |
1828 | break; | |
1829 | ||
1830 | hare = XCDR (hare); | |
1831 | tortoise = XCDR (tortoise); | |
1832 | ||
1833 | if (EQ (hare, tortoise)) | |
1834 | break; | |
1835 | } | |
1836 | ||
1837 | if (!NILP (hare)) | |
1838 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1839 | ||
1840 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1841 | } | |
1842 | ||
1843 | ||
e0f24100 | 1844 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1845 | a list containing one of CONDITIONS. */ |
1846 | ||
1847 | static int | |
d3da34e0 | 1848 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1849 | { |
4de86b16 | 1850 | if (NILP (list)) |
128c0f66 RM |
1851 | return 0; |
1852 | if (! CONSP (list)) | |
1853 | return 1; | |
1854 | ||
ab67260b | 1855 | while (CONSP (conditions)) |
128c0f66 | 1856 | { |
ab67260b | 1857 | Lisp_Object this, tail; |
03699b14 KR |
1858 | this = XCAR (conditions); |
1859 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1860 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1861 | return 1; |
03699b14 | 1862 | conditions = XCDR (conditions); |
128c0f66 | 1863 | } |
ab67260b | 1864 | return 0; |
128c0f66 RM |
1865 | } |
1866 | ||
fc950e09 KH |
1867 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1868 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1869 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1870 | |
1871 | static int | |
d3da34e0 | 1872 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1873 | { |
1874 | Lisp_Object tail; | |
1875 | int first_string = 1; | |
1876 | Lisp_Object error_message; | |
1877 | ||
17401c97 GM |
1878 | error_message = Qnil; |
1879 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1880 | { |
03699b14 | 1881 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1882 | { |
1883 | if (first_string) | |
1884 | { | |
1885 | error_message = Ferror_message_string (data); | |
1886 | first_string = 0; | |
1887 | } | |
177c0ea7 | 1888 | |
03699b14 | 1889 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1890 | return 1; |
1891 | } | |
1892 | else | |
1893 | { | |
1894 | Lisp_Object contail; | |
1895 | ||
17401c97 | 1896 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1897 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1898 | return 1; |
1899 | } | |
1900 | } | |
1901 | ||
1902 | return 0; | |
1903 | } | |
1904 | ||
ddaa36e1 AS |
1905 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
1906 | SIG and DATA describe the signal, as in find_handler_clause. */ | |
1907 | ||
1908 | static int | |
d3da34e0 | 1909 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1910 | { |
1911 | Lisp_Object combined_data; | |
1912 | ||
1913 | combined_data = Fcons (sig, data); | |
1914 | ||
1915 | if ( | |
1916 | /* Don't try to run the debugger with interrupts blocked. | |
1917 | The editing loop would return anyway. */ | |
1918 | ! INPUT_BLOCKED_P | |
1919 | /* Does user want to enter debugger for this kind of error? */ | |
1920 | && (EQ (sig, Qquit) | |
1921 | ? debug_on_quit | |
1922 | : wants_debugger (Vdebug_on_error, conditions)) | |
1923 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1924 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1925 | && when_entered_debugger < num_nonmacro_input_events) |
1926 | { | |
1927 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1928 | return 1; | |
1929 | } | |
1930 | ||
1931 | return 0; | |
1932 | } | |
1933 | ||
128c0f66 | 1934 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1935 | There are two ways to pass SIG and DATA: |
9b942ebd | 1936 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1937 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1938 | This is for memory-full errors only. |
1ea9dec4 | 1939 | |
9f5903bb RS |
1940 | We need to increase max_specpdl_size temporarily around |
1941 | anything we do that can push on the specpdl, so as not to get | |
1942 | a second error here in case we're handling specpdl overflow. */ | |
db9f0278 JB |
1943 | |
1944 | static Lisp_Object | |
d3da34e0 JB |
1945 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions, |
1946 | Lisp_Object sig, Lisp_Object data) | |
db9f0278 JB |
1947 | { |
1948 | register Lisp_Object h; | |
db9f0278 | 1949 | |
f01cbfdd RS |
1950 | /* t is used by handlers for all conditions, set up by C code. */ |
1951 | if (EQ (handlers, Qt)) | |
db9f0278 | 1952 | return Qt; |
f01cbfdd | 1953 | |
61ede770 RS |
1954 | /* error is used similarly, but means print an error message |
1955 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1956 | if (EQ (handlers, Qerror)) |
1957 | return Qt; | |
f01cbfdd | 1958 | |
e7f7fbaa | 1959 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1960 | { |
e7f7fbaa SM |
1961 | Lisp_Object handler = XCAR (h); |
1962 | Lisp_Object condit, tem; | |
5f96776a | 1963 | |
5f96776a | 1964 | if (!CONSP (handler)) |
db9f0278 | 1965 | continue; |
e7f7fbaa | 1966 | condit = XCAR (handler); |
5f96776a RS |
1967 | /* Handle a single condition name in handler HANDLER. */ |
1968 | if (SYMBOLP (condit)) | |
1969 | { | |
1970 | tem = Fmemq (Fcar (handler), conditions); | |
1971 | if (!NILP (tem)) | |
1972 | return handler; | |
1973 | } | |
1974 | /* Handle a list of condition names in handler HANDLER. */ | |
1975 | else if (CONSP (condit)) | |
1976 | { | |
f01cbfdd RS |
1977 | Lisp_Object tail; |
1978 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1979 | { |
e7f7fbaa | 1980 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1981 | if (!NILP (tem)) |
e7f7fbaa | 1982 | return handler; |
5f96776a RS |
1983 | } |
1984 | } | |
db9f0278 | 1985 | } |
f01cbfdd | 1986 | |
db9f0278 JB |
1987 | return Qnil; |
1988 | } | |
1989 | ||
db9f0278 | 1990 | |
f6d62986 | 1991 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1992 | void |
b3ffc17c | 1993 | verror (const char *m, va_list ap) |
db9f0278 | 1994 | { |
70476b54 | 1995 | char buf[4000]; |
5fdb398c | 1996 | size_t size = sizeof buf; |
c9d624c6 | 1997 | size_t size_max = STRING_BYTES_BOUND + 1; |
e6c3da20 | 1998 | size_t mlen = strlen (m); |
9125da08 | 1999 | char *buffer = buf; |
e6c3da20 | 2000 | size_t used; |
9125da08 RS |
2001 | Lisp_Object string; |
2002 | ||
db9f0278 | 2003 | while (1) |
9125da08 | 2004 | { |
c378da0b PE |
2005 | va_list ap_copy; |
2006 | va_copy (ap_copy, ap); | |
2007 | used = doprnt (buffer, size, m, m + mlen, ap_copy); | |
2008 | va_end (ap_copy); | |
eb3f1cc8 | 2009 | |
e6c3da20 EZ |
2010 | /* Note: the -1 below is because `doprnt' returns the number of bytes |
2011 | excluding the terminating null byte, and it always terminates with a | |
2012 | null byte, even when producing a truncated message. */ | |
2013 | if (used < size - 1) | |
eb3f1cc8 | 2014 | break; |
e6c3da20 EZ |
2015 | if (size <= size_max / 2) |
2016 | size *= 2; | |
825cd63c EZ |
2017 | else if (size < size_max) |
2018 | size = size_max; | |
e6c3da20 EZ |
2019 | else |
2020 | break; /* and leave the message truncated */ | |
eb3f1cc8 | 2021 | |
825cd63c EZ |
2022 | if (buffer != buf) |
2023 | xfree (buffer); | |
2024 | buffer = (char *) xmalloc (size); | |
9125da08 RS |
2025 | } |
2026 | ||
5fdb398c | 2027 | string = make_string (buffer, used); |
eb3f1cc8 | 2028 | if (buffer != buf) |
9ae6734f | 2029 | xfree (buffer); |
9125da08 | 2030 | |
734d55a2 | 2031 | xsignal1 (Qerror, string); |
db9f0278 | 2032 | } |
b3ffc17c DN |
2033 | |
2034 | ||
f6d62986 | 2035 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
2036 | |
2037 | /* VARARGS 1 */ | |
2038 | void | |
2039 | error (const char *m, ...) | |
2040 | { | |
2041 | va_list ap; | |
2042 | va_start (ap, m); | |
2043 | verror (m, ap); | |
2044 | va_end (ap); | |
2045 | } | |
db9f0278 | 2046 | \f |
a7ca3326 | 2047 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
2048 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
2049 | This means it contains a description for how to read arguments to give it. | |
2050 | The value is nil for an invalid function or a symbol with no function | |
2051 | definition. | |
2052 | ||
2053 | Interactively callable functions include strings and vectors (treated | |
2054 | as keyboard macros), lambda-expressions that contain a top-level call | |
2055 | to `interactive', autoload definitions made by `autoload' with non-nil | |
2056 | fourth argument, and some of the built-in functions of Lisp. | |
2057 | ||
e72706be RS |
2058 | Also, a symbol satisfies `commandp' if its function definition does so. |
2059 | ||
2060 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2061 | then strings and vectors are not accepted. */) |
5842a27b | 2062 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
2063 | { |
2064 | register Lisp_Object fun; | |
2065 | register Lisp_Object funcar; | |
52b71f49 | 2066 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2067 | |
2068 | fun = function; | |
2069 | ||
52b71f49 SM |
2070 | fun = indirect_function (fun); /* Check cycles. */ |
2071 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2072 | return Qnil; |
db9f0278 | 2073 | |
52b71f49 SM |
2074 | /* Check an `interactive-form' property if present, analogous to the |
2075 | function-documentation property. */ | |
2076 | fun = function; | |
2077 | while (SYMBOLP (fun)) | |
2078 | { | |
2b9aa051 | 2079 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
2080 | if (!NILP (tmp)) |
2081 | if_prop = Qt; | |
2082 | fun = Fsymbol_function (fun); | |
2083 | } | |
2084 | ||
db9f0278 JB |
2085 | /* Emacs primitives are interactive if their DEFUN specifies an |
2086 | interactive spec. */ | |
90165123 | 2087 | if (SUBRP (fun)) |
04724b69 | 2088 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2089 | |
2090 | /* Bytecode objects are interactive if they are long enough to | |
2091 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2092 | where the interactive spec is stored. */ | |
90165123 | 2093 | else if (COMPILEDP (fun)) |
845975f5 | 2094 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2095 | ? Qt : if_prop); |
db9f0278 JB |
2096 | |
2097 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2098 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2099 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2100 | |
2101 | /* Lists may represent commands. */ | |
2102 | if (!CONSP (fun)) | |
2103 | return Qnil; | |
ed16fb98 | 2104 | funcar = XCAR (fun); |
b38b1ec0 | 2105 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
2106 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
2107 | ? Qt : if_prop); | |
23aba0ea | 2108 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 2109 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 2110 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 2111 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2112 | else |
2113 | return Qnil; | |
2114 | } | |
2115 | ||
db9f0278 | 2116 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
2117 | doc: /* Define FUNCTION to autoload from FILE. |
2118 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2119 | Third arg DOCSTRING is documentation for the function. | |
2120 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2121 | Fifth arg TYPE indicates the type of the object: | |
2122 | nil or omitted says FUNCTION is a function, | |
2123 | `keymap' says FUNCTION is really a keymap, and | |
2124 | `macro' or t says FUNCTION is really a macro. | |
2125 | Third through fifth args give info about the real definition. | |
2126 | They default to nil. | |
2127 | If FUNCTION is already defined other than as an autoload, | |
2128 | this does nothing and returns nil. */) | |
5842a27b | 2129 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 2130 | { |
b7826503 PJ |
2131 | CHECK_SYMBOL (function); |
2132 | CHECK_STRING (file); | |
db9f0278 | 2133 | |
f6d62986 | 2134 | /* If function is defined and not as an autoload, don't override. */ |
db9f0278 | 2135 | if (!EQ (XSYMBOL (function)->function, Qunbound) |
90165123 | 2136 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2137 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2138 | return Qnil; |
2139 | ||
7973e637 SM |
2140 | if (NILP (Vpurify_flag)) |
2141 | /* Only add entries after dumping, because the ones before are | |
2142 | not useful and else we get loads of them from the loaddefs.el. */ | |
2143 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
905a9ed3 | 2144 | else |
a56eaaef | 2145 | /* We don't want the docstring in purespace (instead, |
d6d23852 SM |
2146 | Snarf-documentation should (hopefully) overwrite it). |
2147 | We used to use 0 here, but that leads to accidental sharing in | |
2148 | purecopy's hash-consing, so we use a (hopefully) unique integer | |
2149 | instead. */ | |
51639eac | 2150 | docstring = make_number (XPNTR (function)); |
a56eaaef DN |
2151 | return Ffset (function, |
2152 | Fpurecopy (list5 (Qautoload, file, docstring, | |
2153 | interactive, type))); | |
db9f0278 JB |
2154 | } |
2155 | ||
2156 | Lisp_Object | |
d3da34e0 | 2157 | un_autoload (Lisp_Object oldqueue) |
db9f0278 JB |
2158 | { |
2159 | register Lisp_Object queue, first, second; | |
2160 | ||
2161 | /* Queue to unwind is current value of Vautoload_queue. | |
2162 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2163 | queue = Vautoload_queue; | |
2164 | Vautoload_queue = oldqueue; | |
2165 | while (CONSP (queue)) | |
2166 | { | |
e509f168 | 2167 | first = XCAR (queue); |
db9f0278 JB |
2168 | second = Fcdr (first); |
2169 | first = Fcar (first); | |
47b82df9 RS |
2170 | if (EQ (first, make_number (0))) |
2171 | Vfeatures = second; | |
db9f0278 JB |
2172 | else |
2173 | Ffset (first, second); | |
e509f168 | 2174 | queue = XCDR (queue); |
db9f0278 JB |
2175 | } |
2176 | return Qnil; | |
2177 | } | |
2178 | ||
ca20916b RS |
2179 | /* Load an autoloaded function. |
2180 | FUNNAME is the symbol which is the function's name. | |
2181 | FUNDEF is the autoload definition (a list). */ | |
2182 | ||
045ba794 | 2183 | void |
d3da34e0 | 2184 | do_autoload (Lisp_Object fundef, Lisp_Object funname) |
db9f0278 | 2185 | { |
aed13378 | 2186 | int count = SPECPDL_INDEX (); |
d945992e | 2187 | Lisp_Object fun; |
ca20916b | 2188 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2189 | |
aea6173f RS |
2190 | /* This is to make sure that loadup.el gives a clear picture |
2191 | of what files are preloaded and when. */ | |
ab4db096 RS |
2192 | if (! NILP (Vpurify_flag)) |
2193 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2194 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2195 | |
db9f0278 | 2196 | fun = funname; |
b7826503 | 2197 | CHECK_SYMBOL (funname); |
ca20916b | 2198 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2199 | |
f87740dc | 2200 | /* Preserve the match data. */ |
89f2614d | 2201 | record_unwind_save_match_data (); |
177c0ea7 | 2202 | |
a04ee161 RS |
2203 | /* If autoloading gets an error (which includes the error of failing |
2204 | to define the function being called), we use Vautoload_queue | |
2205 | to undo function definitions and `provide' calls made by | |
2206 | the function. We do this in the specific case of autoloading | |
2207 | because autoloading is not an explicit request "load this file", | |
2208 | but rather a request to "call this function". | |
d3da34e0 | 2209 | |
a04ee161 | 2210 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
2211 | record_unwind_protect (un_autoload, Vautoload_queue); |
2212 | Vautoload_queue = Qt; | |
7351b242 | 2213 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2214 | |
db9f0278 JB |
2215 | /* Once loading finishes, don't undo it. */ |
2216 | Vautoload_queue = Qt; | |
2217 | unbind_to (count, Qnil); | |
2218 | ||
a7f96a35 | 2219 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2220 | |
76c2b0cc | 2221 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2222 | error ("Autoloading failed to define function %s", |
d5db4077 | 2223 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2224 | UNGCPRO; |
db9f0278 | 2225 | } |
4c576a83 | 2226 | |
db9f0278 | 2227 | \f |
a7ca3326 | 2228 | DEFUN ("eval", Feval, Seval, 1, 2, 0, |
a0ee6f27 SM |
2229 | doc: /* Evaluate FORM and return its value. |
2230 | If LEXICAL is t, evaluate using lexical scoping. */) | |
2231 | (Lisp_Object form, Lisp_Object lexical) | |
defb1411 SM |
2232 | { |
2233 | int count = SPECPDL_INDEX (); | |
a0ee6f27 SM |
2234 | specbind (Qinternal_interpreter_environment, |
2235 | NILP (lexical) ? Qnil : Fcons (Qt, Qnil)); | |
defb1411 SM |
2236 | return unbind_to (count, eval_sub (form)); |
2237 | } | |
2238 | ||
2239 | /* Eval a sub-expression of the current expression (i.e. in the same | |
2240 | lexical scope). */ | |
2241 | Lisp_Object | |
2242 | eval_sub (Lisp_Object form) | |
db9f0278 JB |
2243 | { |
2244 | Lisp_Object fun, val, original_fun, original_args; | |
2245 | Lisp_Object funcar; | |
2246 | struct backtrace backtrace; | |
2247 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2248 | ||
df470e3b | 2249 | if (handling_signal) |
48f8dfa3 | 2250 | abort (); |
177c0ea7 | 2251 | |
90165123 | 2252 | if (SYMBOLP (form)) |
b9598260 | 2253 | { |
f07a954e SM |
2254 | /* Look up its binding in the lexical environment. |
2255 | We do not pay attention to the declared_special flag here, since we | |
2256 | already did that when let-binding the variable. */ | |
2257 | Lisp_Object lex_binding | |
2258 | = !NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
2259 | ? Fassq (form, Vinternal_interpreter_environment) | |
2260 | : Qnil; | |
2261 | if (CONSP (lex_binding)) | |
2262 | return XCDR (lex_binding); | |
2263 | else | |
2264 | return Fsymbol_value (form); | |
b9598260 SM |
2265 | } |
2266 | ||
db9f0278 JB |
2267 | if (!CONSP (form)) |
2268 | return form; | |
2269 | ||
2270 | QUIT; | |
ee830945 RS |
2271 | if ((consing_since_gc > gc_cons_threshold |
2272 | && consing_since_gc > gc_relative_threshold) | |
2273 | || | |
2274 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2275 | { |
2276 | GCPRO1 (form); | |
2277 | Fgarbage_collect (); | |
2278 | UNGCPRO; | |
2279 | } | |
2280 | ||
2281 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2282 | { | |
2283 | if (max_lisp_eval_depth < 100) | |
2284 | max_lisp_eval_depth = 100; | |
2285 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2286 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2287 | } |
2288 | ||
2289 | original_fun = Fcar (form); | |
2290 | original_args = Fcdr (form); | |
2291 | ||
2292 | backtrace.next = backtrace_list; | |
2293 | backtrace_list = &backtrace; | |
f6d62986 | 2294 | backtrace.function = &original_fun; /* This also protects them from gc. */ |
db9f0278 JB |
2295 | backtrace.args = &original_args; |
2296 | backtrace.nargs = UNEVALLED; | |
2297 | backtrace.evalargs = 1; | |
2298 | backtrace.debug_on_exit = 0; | |
2299 | ||
2300 | if (debug_on_next_call) | |
2301 | do_debug_on_call (Qt); | |
2302 | ||
2303 | /* At this point, only original_fun and original_args | |
f6d62986 | 2304 | have values that will be used below. */ |
db9f0278 | 2305 | retry: |
8788120f KS |
2306 | |
2307 | /* Optimize for no indirection. */ | |
2308 | fun = original_fun; | |
2309 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2310 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2311 | fun = indirect_function (fun); | |
db9f0278 | 2312 | |
90165123 | 2313 | if (SUBRP (fun)) |
db9f0278 JB |
2314 | { |
2315 | Lisp_Object numargs; | |
166c822d | 2316 | Lisp_Object argvals[8]; |
db9f0278 JB |
2317 | Lisp_Object args_left; |
2318 | register int i, maxargs; | |
2319 | ||
2320 | args_left = original_args; | |
2321 | numargs = Flength (args_left); | |
2322 | ||
c1788fbc RS |
2323 | CHECK_CONS_LIST (); |
2324 | ||
f6d62986 SM |
2325 | if (XINT (numargs) < XSUBR (fun)->min_args |
2326 | || (XSUBR (fun)->max_args >= 0 | |
2327 | && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2328 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2329 | |
ef1b0ba7 | 2330 | else if (XSUBR (fun)->max_args == UNEVALLED) |
db9f0278 JB |
2331 | { |
2332 | backtrace.evalargs = 0; | |
d5273788 | 2333 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
db9f0278 | 2334 | } |
ef1b0ba7 | 2335 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 | 2336 | { |
f6d62986 | 2337 | /* Pass a vector of evaluated arguments. */ |
db9f0278 | 2338 | Lisp_Object *vals; |
f66c7cf8 | 2339 | ptrdiff_t argnum = 0; |
3a7a9129 | 2340 | USE_SAFE_ALLOCA; |
db9f0278 | 2341 | |
b72e0717 | 2342 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2343 | |
2344 | GCPRO3 (args_left, fun, fun); | |
2345 | gcpro3.var = vals; | |
2346 | gcpro3.nvars = 0; | |
2347 | ||
265a9e55 | 2348 | while (!NILP (args_left)) |
db9f0278 | 2349 | { |
defb1411 | 2350 | vals[argnum++] = eval_sub (Fcar (args_left)); |
db9f0278 JB |
2351 | args_left = Fcdr (args_left); |
2352 | gcpro3.nvars = argnum; | |
2353 | } | |
db9f0278 JB |
2354 | |
2355 | backtrace.args = vals; | |
2356 | backtrace.nargs = XINT (numargs); | |
2357 | ||
d5273788 | 2358 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2359 | UNGCPRO; |
3a7a9129 | 2360 | SAFE_FREE (); |
db9f0278 | 2361 | } |
ef1b0ba7 | 2362 | else |
db9f0278 | 2363 | { |
ef1b0ba7 SM |
2364 | GCPRO3 (args_left, fun, fun); |
2365 | gcpro3.var = argvals; | |
2366 | gcpro3.nvars = 0; | |
db9f0278 | 2367 | |
ef1b0ba7 SM |
2368 | maxargs = XSUBR (fun)->max_args; |
2369 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2370 | { | |
a0ee6f27 | 2371 | argvals[i] = eval_sub (Fcar (args_left)); |
ef1b0ba7 SM |
2372 | gcpro3.nvars = ++i; |
2373 | } | |
db9f0278 | 2374 | |
ef1b0ba7 | 2375 | UNGCPRO; |
db9f0278 | 2376 | |
ef1b0ba7 SM |
2377 | backtrace.args = argvals; |
2378 | backtrace.nargs = XINT (numargs); | |
2379 | ||
2380 | switch (i) | |
2381 | { | |
2382 | case 0: | |
2383 | val = (XSUBR (fun)->function.a0 ()); | |
2384 | break; | |
2385 | case 1: | |
2386 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2387 | break; | |
2388 | case 2: | |
2389 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2390 | break; | |
2391 | case 3: | |
2392 | val = (XSUBR (fun)->function.a3 | |
2393 | (argvals[0], argvals[1], argvals[2])); | |
2394 | break; | |
2395 | case 4: | |
2396 | val = (XSUBR (fun)->function.a4 | |
2397 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2398 | break; | |
2399 | case 5: | |
2400 | val = (XSUBR (fun)->function.a5 | |
2401 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2402 | argvals[4])); | |
2403 | break; | |
2404 | case 6: | |
2405 | val = (XSUBR (fun)->function.a6 | |
2406 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2407 | argvals[4], argvals[5])); | |
2408 | break; | |
2409 | case 7: | |
2410 | val = (XSUBR (fun)->function.a7 | |
2411 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2412 | argvals[4], argvals[5], argvals[6])); | |
2413 | break; | |
2414 | ||
2415 | case 8: | |
2416 | val = (XSUBR (fun)->function.a8 | |
2417 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2418 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2419 | break; | |
2420 | ||
2421 | default: | |
2422 | /* Someone has created a subr that takes more arguments than | |
2423 | is supported by this code. We need to either rewrite the | |
2424 | subr to use a different argument protocol, or add more | |
2425 | cases to this switch. */ | |
2426 | abort (); | |
2427 | } | |
db9f0278 JB |
2428 | } |
2429 | } | |
ef1b0ba7 | 2430 | else if (COMPILEDP (fun)) |
defb1411 | 2431 | val = apply_lambda (fun, original_args); |
db9f0278 JB |
2432 | else |
2433 | { | |
8788120f | 2434 | if (EQ (fun, Qunbound)) |
734d55a2 | 2435 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2436 | if (!CONSP (fun)) |
734d55a2 KS |
2437 | xsignal1 (Qinvalid_function, original_fun); |
2438 | funcar = XCAR (fun); | |
90165123 | 2439 | if (!SYMBOLP (funcar)) |
734d55a2 | 2440 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2441 | if (EQ (funcar, Qautoload)) |
2442 | { | |
2443 | do_autoload (fun, original_fun); | |
2444 | goto retry; | |
2445 | } | |
2446 | if (EQ (funcar, Qmacro)) | |
defb1411 SM |
2447 | val = eval_sub (apply1 (Fcdr (fun), original_args)); |
2448 | else if (EQ (funcar, Qlambda) | |
2449 | || EQ (funcar, Qclosure)) | |
2450 | val = apply_lambda (fun, original_args); | |
db9f0278 | 2451 | else |
734d55a2 | 2452 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2453 | } |
c1788fbc RS |
2454 | CHECK_CONS_LIST (); |
2455 | ||
db9f0278 JB |
2456 | lisp_eval_depth--; |
2457 | if (backtrace.debug_on_exit) | |
2458 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2459 | backtrace_list = backtrace.next; | |
824eb35e | 2460 | |
db9f0278 JB |
2461 | return val; |
2462 | } | |
2463 | \f | |
a7ca3326 | 2464 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, |
9dbc9081 PJ |
2465 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2466 | Then return the value FUNCTION returns. | |
2467 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2468 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2469 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2470 | { |
f66c7cf8 | 2471 | ptrdiff_t i, numargs; |
db9f0278 JB |
2472 | register Lisp_Object spread_arg; |
2473 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2474 | Lisp_Object fun, retval; |
96d44c64 | 2475 | struct gcpro gcpro1; |
3a7a9129 | 2476 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2477 | |
2478 | fun = args [0]; | |
2479 | funcall_args = 0; | |
2480 | spread_arg = args [nargs - 1]; | |
b7826503 | 2481 | CHECK_LIST (spread_arg); |
177c0ea7 | 2482 | |
db9f0278 JB |
2483 | numargs = XINT (Flength (spread_arg)); |
2484 | ||
2485 | if (numargs == 0) | |
2486 | return Ffuncall (nargs - 1, args); | |
2487 | else if (numargs == 1) | |
2488 | { | |
03699b14 | 2489 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2490 | return Ffuncall (nargs, args); |
2491 | } | |
2492 | ||
a6e3fa71 | 2493 | numargs += nargs - 2; |
db9f0278 | 2494 | |
8788120f KS |
2495 | /* Optimize for no indirection. */ |
2496 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2497 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2498 | fun = indirect_function (fun); | |
ffd56f97 | 2499 | if (EQ (fun, Qunbound)) |
db9f0278 | 2500 | { |
f6d62986 | 2501 | /* Let funcall get the error. */ |
ffd56f97 JB |
2502 | fun = args[0]; |
2503 | goto funcall; | |
db9f0278 JB |
2504 | } |
2505 | ||
90165123 | 2506 | if (SUBRP (fun)) |
db9f0278 JB |
2507 | { |
2508 | if (numargs < XSUBR (fun)->min_args | |
2509 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
f6d62986 | 2510 | goto funcall; /* Let funcall get the error. */ |
c5101a77 | 2511 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2512 | { |
2513 | /* Avoid making funcall cons up a yet another new vector of arguments | |
f6d62986 | 2514 | by explicitly supplying nil's for optional values. */ |
b72e0717 | 2515 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2516 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2517 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2518 | GCPRO1 (*funcall_args); |
2519 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2520 | } |
2521 | } | |
2522 | funcall: | |
2523 | /* We add 1 to numargs because funcall_args includes the | |
2524 | function itself as well as its arguments. */ | |
2525 | if (!funcall_args) | |
a6e3fa71 | 2526 | { |
b72e0717 | 2527 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2528 | GCPRO1 (*funcall_args); |
2529 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2530 | } |
2531 | ||
72af86bd | 2532 | memcpy (funcall_args, args, nargs * sizeof (Lisp_Object)); |
db9f0278 JB |
2533 | /* Spread the last arg we got. Its first element goes in |
2534 | the slot that it used to occupy, hence this value of I. */ | |
2535 | i = nargs - 1; | |
265a9e55 | 2536 | while (!NILP (spread_arg)) |
db9f0278 | 2537 | { |
03699b14 KR |
2538 | funcall_args [i++] = XCAR (spread_arg); |
2539 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2540 | } |
a6e3fa71 | 2541 | |
96d44c64 | 2542 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2543 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2544 | UNGCPRO; | |
2545 | SAFE_FREE (); | |
2546 | ||
2547 | return retval; | |
db9f0278 JB |
2548 | } |
2549 | \f | |
ff936e53 SM |
2550 | /* Run hook variables in various ways. */ |
2551 | ||
f6d62986 | 2552 | static Lisp_Object |
f66c7cf8 | 2553 | funcall_nil (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2554 | { |
2555 | Ffuncall (nargs, args); | |
2556 | return Qnil; | |
2557 | } | |
ff936e53 | 2558 | |
a7ca3326 | 2559 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2560 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2561 | Each argument should be a symbol, a hook variable. |
2562 | These symbols are processed in the order specified. | |
2563 | If a hook symbol has a non-nil value, that value may be a function | |
2564 | or a list of functions to be called to run the hook. | |
2565 | If the value is a function, it is called with no arguments. | |
2566 | If it is a list, the elements are called, in order, with no arguments. | |
2567 | ||
9f685258 LK |
2568 | Major modes should not use this function directly to run their mode |
2569 | hook; they should use `run-mode-hooks' instead. | |
2570 | ||
72e85d5d RS |
2571 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2572 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2573 | usage: (run-hooks &rest HOOKS) */) |
f66c7cf8 | 2574 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 SM |
2575 | { |
2576 | Lisp_Object hook[1]; | |
f66c7cf8 | 2577 | ptrdiff_t i; |
ff936e53 SM |
2578 | |
2579 | for (i = 0; i < nargs; i++) | |
2580 | { | |
2581 | hook[0] = args[i]; | |
f6d62986 | 2582 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
2583 | } |
2584 | ||
2585 | return Qnil; | |
2586 | } | |
177c0ea7 | 2587 | |
a7ca3326 | 2588 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2589 | Srun_hook_with_args, 1, MANY, 0, |
2590 | doc: /* Run HOOK with the specified arguments ARGS. | |
2591 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2592 | value, that value may be a function or a list of functions to be | |
2593 | called to run the hook. If the value is a function, it is called with | |
2594 | the given arguments and its return value is returned. If it is a list | |
2595 | of functions, those functions are called, in order, | |
2596 | with the given arguments ARGS. | |
d5e2c90c | 2597 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2598 | as that may change. |
2599 | ||
72e85d5d RS |
2600 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2601 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2602 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
f66c7cf8 | 2603 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2604 | { |
f6d62986 | 2605 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
2606 | } |
2607 | ||
a0d76c27 | 2608 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2609 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2610 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2611 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2612 | value, that value may be a function or a list of functions to be | |
2613 | called to run the hook. If the value is a function, it is called with | |
2614 | the given arguments and its return value is returned. | |
2615 | If it is a list of functions, those functions are called, in order, | |
2616 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2617 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2618 | However, if they all return nil, we return nil. |
9dbc9081 | 2619 | |
72e85d5d RS |
2620 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2621 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2622 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
f66c7cf8 | 2623 | (ptrdiff_t nargs, Lisp_Object *args) |
b0b667cb | 2624 | { |
f6d62986 SM |
2625 | return run_hook_with_args (nargs, args, Ffuncall); |
2626 | } | |
2627 | ||
2628 | static Lisp_Object | |
f66c7cf8 | 2629 | funcall_not (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2630 | { |
2631 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
2632 | } |
2633 | ||
a7ca3326 | 2634 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2635 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2636 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2637 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2638 | value, that value may be a function or a list of functions to be | |
2639 | called to run the hook. If the value is a function, it is called with | |
2640 | the given arguments and its return value is returned. | |
2641 | If it is a list of functions, those functions are called, in order, | |
2642 | with the given arguments ARGS, until one of them returns nil. | |
2643 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2644 | |
72e85d5d RS |
2645 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2646 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2647 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
f66c7cf8 | 2648 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2649 | { |
f6d62986 | 2650 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
2651 | } |
2652 | ||
f6d62986 | 2653 | static Lisp_Object |
f66c7cf8 | 2654 | run_hook_wrapped_funcall (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2655 | { |
2656 | Lisp_Object tmp = args[0], ret; | |
2657 | args[0] = args[1]; | |
2658 | args[1] = tmp; | |
2659 | ret = Ffuncall (nargs, args); | |
2660 | args[1] = args[0]; | |
2661 | args[0] = tmp; | |
2662 | return ret; | |
2663 | } | |
2664 | ||
2665 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
2666 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
2667 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
2668 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
2669 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
2670 | aborts and returns that value. | |
2671 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
f66c7cf8 | 2672 | (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2673 | { |
2674 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
2675 | } | |
ff936e53 | 2676 | |
c933ea05 RS |
2677 | /* ARGS[0] should be a hook symbol. |
2678 | Call each of the functions in the hook value, passing each of them | |
2679 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 2680 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
2681 | The caller (or its caller, etc) must gcpro all of ARGS, |
2682 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2683 | ||
f6d62986 | 2684 | Lisp_Object |
f66c7cf8 PE |
2685 | run_hook_with_args (ptrdiff_t nargs, Lisp_Object *args, |
2686 | Lisp_Object (*funcall) (ptrdiff_t nargs, Lisp_Object *args)) | |
ff936e53 | 2687 | { |
f6d62986 | 2688 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 2689 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2690 | |
f029ca5f RS |
2691 | /* If we are dying or still initializing, |
2692 | don't do anything--it would probably crash if we tried. */ | |
2693 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2694 | return Qnil; |
f029ca5f | 2695 | |
b0b667cb | 2696 | sym = args[0]; |
aa681b51 | 2697 | val = find_symbol_value (sym); |
ff936e53 | 2698 | |
b0b667cb | 2699 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2700 | return ret; |
03699b14 | 2701 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2702 | { |
2703 | args[0] = val; | |
f6d62986 | 2704 | return funcall (nargs, args); |
b0b667cb KH |
2705 | } |
2706 | else | |
2707 | { | |
1faed8ae PE |
2708 | Lisp_Object global_vals = Qnil; |
2709 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2710 | |
ff936e53 | 2711 | for (; |
f6d62986 | 2712 | CONSP (val) && NILP (ret); |
03699b14 | 2713 | val = XCDR (val)) |
b0b667cb | 2714 | { |
03699b14 | 2715 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2716 | { |
2717 | /* t indicates this hook has a local binding; | |
2718 | it means to run the global binding too. */ | |
1faed8ae PE |
2719 | global_vals = Fdefault_value (sym); |
2720 | if (NILP (global_vals)) continue; | |
b0b667cb | 2721 | |
1faed8ae | 2722 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2723 | { |
1faed8ae | 2724 | args[0] = global_vals; |
f6d62986 | 2725 | ret = funcall (nargs, args); |
8932b1c2 CY |
2726 | } |
2727 | else | |
2728 | { | |
2729 | for (; | |
f6d62986 | 2730 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 2731 | global_vals = XCDR (global_vals)) |
8932b1c2 | 2732 | { |
1faed8ae | 2733 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2734 | /* In a global value, t should not occur. If it does, we |
2735 | must ignore it to avoid an endless loop. */ | |
2736 | if (!EQ (args[0], Qt)) | |
f6d62986 | 2737 | ret = funcall (nargs, args); |
8932b1c2 | 2738 | } |
b0b667cb KH |
2739 | } |
2740 | } | |
2741 | else | |
2742 | { | |
03699b14 | 2743 | args[0] = XCAR (val); |
f6d62986 | 2744 | ret = funcall (nargs, args); |
b0b667cb KH |
2745 | } |
2746 | } | |
cb9d21f8 RS |
2747 | |
2748 | UNGCPRO; | |
ff936e53 | 2749 | return ret; |
b0b667cb KH |
2750 | } |
2751 | } | |
c933ea05 | 2752 | |
7d48558f RS |
2753 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2754 | ||
2755 | void | |
d3da34e0 | 2756 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2757 | { |
2758 | Lisp_Object temp[3]; | |
2759 | temp[0] = hook; | |
2760 | temp[1] = arg1; | |
2761 | temp[2] = arg2; | |
2762 | ||
2763 | Frun_hook_with_args (3, temp); | |
2764 | } | |
ff936e53 | 2765 | \f |
f6d62986 | 2766 | /* Apply fn to arg. */ |
db9f0278 | 2767 | Lisp_Object |
d3da34e0 | 2768 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2769 | { |
a6e3fa71 JB |
2770 | struct gcpro gcpro1; |
2771 | ||
2772 | GCPRO1 (fn); | |
265a9e55 | 2773 | if (NILP (arg)) |
a6e3fa71 JB |
2774 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2775 | gcpro1.nvars = 2; | |
db9f0278 JB |
2776 | { |
2777 | Lisp_Object args[2]; | |
2778 | args[0] = fn; | |
2779 | args[1] = arg; | |
a6e3fa71 JB |
2780 | gcpro1.var = args; |
2781 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2782 | } |
db9f0278 JB |
2783 | } |
2784 | ||
f6d62986 | 2785 | /* Call function fn on no arguments. */ |
db9f0278 | 2786 | Lisp_Object |
d3da34e0 | 2787 | call0 (Lisp_Object fn) |
db9f0278 | 2788 | { |
a6e3fa71 JB |
2789 | struct gcpro gcpro1; |
2790 | ||
2791 | GCPRO1 (fn); | |
2792 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2793 | } |
2794 | ||
f6d62986 | 2795 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
2796 | /* ARGSUSED */ |
2797 | Lisp_Object | |
d3da34e0 | 2798 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2799 | { |
a6e3fa71 | 2800 | struct gcpro gcpro1; |
177c0ea7 | 2801 | Lisp_Object args[2]; |
a6e3fa71 | 2802 | |
db9f0278 | 2803 | args[0] = fn; |
15285f9f | 2804 | args[1] = arg1; |
a6e3fa71 JB |
2805 | GCPRO1 (args[0]); |
2806 | gcpro1.nvars = 2; | |
2807 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2808 | } |
2809 | ||
f6d62986 | 2810 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
2811 | /* ARGSUSED */ |
2812 | Lisp_Object | |
d3da34e0 | 2813 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2814 | { |
a6e3fa71 | 2815 | struct gcpro gcpro1; |
db9f0278 JB |
2816 | Lisp_Object args[3]; |
2817 | args[0] = fn; | |
15285f9f RS |
2818 | args[1] = arg1; |
2819 | args[2] = arg2; | |
a6e3fa71 JB |
2820 | GCPRO1 (args[0]); |
2821 | gcpro1.nvars = 3; | |
2822 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2823 | } |
2824 | ||
f6d62986 | 2825 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
2826 | /* ARGSUSED */ |
2827 | Lisp_Object | |
d3da34e0 | 2828 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2829 | { |
a6e3fa71 | 2830 | struct gcpro gcpro1; |
db9f0278 JB |
2831 | Lisp_Object args[4]; |
2832 | args[0] = fn; | |
15285f9f RS |
2833 | args[1] = arg1; |
2834 | args[2] = arg2; | |
2835 | args[3] = arg3; | |
a6e3fa71 JB |
2836 | GCPRO1 (args[0]); |
2837 | gcpro1.nvars = 4; | |
2838 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2839 | } |
2840 | ||
f6d62986 | 2841 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
2842 | /* ARGSUSED */ |
2843 | Lisp_Object | |
d3da34e0 JB |
2844 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2845 | Lisp_Object arg4) | |
a5a44b91 JB |
2846 | { |
2847 | struct gcpro gcpro1; | |
a5a44b91 JB |
2848 | Lisp_Object args[5]; |
2849 | args[0] = fn; | |
15285f9f RS |
2850 | args[1] = arg1; |
2851 | args[2] = arg2; | |
2852 | args[3] = arg3; | |
2853 | args[4] = arg4; | |
a5a44b91 JB |
2854 | GCPRO1 (args[0]); |
2855 | gcpro1.nvars = 5; | |
2856 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2857 | } |
2858 | ||
f6d62986 | 2859 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
2860 | /* ARGSUSED */ |
2861 | Lisp_Object | |
d3da34e0 JB |
2862 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2863 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2864 | { |
2865 | struct gcpro gcpro1; | |
15285f9f RS |
2866 | Lisp_Object args[6]; |
2867 | args[0] = fn; | |
2868 | args[1] = arg1; | |
2869 | args[2] = arg2; | |
2870 | args[3] = arg3; | |
2871 | args[4] = arg4; | |
2872 | args[5] = arg5; | |
2873 | GCPRO1 (args[0]); | |
2874 | gcpro1.nvars = 6; | |
2875 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2876 | } |
2877 | ||
f6d62986 | 2878 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
2879 | /* ARGSUSED */ |
2880 | Lisp_Object | |
d3da34e0 JB |
2881 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2882 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2883 | { |
2884 | struct gcpro gcpro1; | |
15285f9f RS |
2885 | Lisp_Object args[7]; |
2886 | args[0] = fn; | |
2887 | args[1] = arg1; | |
2888 | args[2] = arg2; | |
2889 | args[3] = arg3; | |
2890 | args[4] = arg4; | |
2891 | args[5] = arg5; | |
2892 | args[6] = arg6; | |
2893 | GCPRO1 (args[0]); | |
2894 | gcpro1.nvars = 7; | |
2895 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2896 | } |
2897 | ||
f6d62986 | 2898 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
2899 | /* ARGSUSED */ |
2900 | Lisp_Object | |
d3da34e0 JB |
2901 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2902 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2903 | { |
2904 | struct gcpro gcpro1; | |
574c05e2 KK |
2905 | Lisp_Object args[8]; |
2906 | args[0] = fn; | |
2907 | args[1] = arg1; | |
2908 | args[2] = arg2; | |
2909 | args[3] = arg3; | |
2910 | args[4] = arg4; | |
2911 | args[5] = arg5; | |
2912 | args[6] = arg6; | |
2913 | args[7] = arg7; | |
2914 | GCPRO1 (args[0]); | |
2915 | gcpro1.nvars = 8; | |
2916 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2917 | } |
2918 | ||
6c2ef893 RS |
2919 | /* The caller should GCPRO all the elements of ARGS. */ |
2920 | ||
a7ca3326 | 2921 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 2922 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 2923 | (Lisp_Object object) |
b9598260 SM |
2924 | { |
2925 | if (SYMBOLP (object) && !NILP (Ffboundp (object))) | |
2926 | { | |
ba83908c | 2927 | object = Findirect_function (object, Qt); |
b9598260 SM |
2928 | |
2929 | if (CONSP (object) && EQ (XCAR (object), Qautoload)) | |
2930 | { | |
2931 | /* Autoloaded symbols are functions, except if they load | |
2932 | macros or keymaps. */ | |
2933 | int i; | |
2934 | for (i = 0; i < 4 && CONSP (object); i++) | |
2935 | object = XCDR (object); | |
2936 | ||
2937 | return (CONSP (object) && !NILP (XCAR (object))) ? Qnil : Qt; | |
2938 | } | |
2939 | } | |
2940 | ||
2941 | if (SUBRP (object)) | |
3c3ddb98 | 2942 | return (XSUBR (object)->max_args != UNEVALLED) ? Qt : Qnil; |
876c194c | 2943 | else if (COMPILEDP (object)) |
b9598260 SM |
2944 | return Qt; |
2945 | else if (CONSP (object)) | |
2946 | { | |
2947 | Lisp_Object car = XCAR (object); | |
2948 | return (EQ (car, Qlambda) || EQ (car, Qclosure)) ? Qt : Qnil; | |
2949 | } | |
2950 | else | |
2951 | return Qnil; | |
2952 | } | |
2953 | ||
a7ca3326 | 2954 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2955 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2956 | Return the value that function returns. | |
2957 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2958 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2959 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2960 | { |
8788120f | 2961 | Lisp_Object fun, original_fun; |
db9f0278 | 2962 | Lisp_Object funcar; |
f66c7cf8 | 2963 | ptrdiff_t numargs = nargs - 1; |
db9f0278 JB |
2964 | Lisp_Object lisp_numargs; |
2965 | Lisp_Object val; | |
2966 | struct backtrace backtrace; | |
2967 | register Lisp_Object *internal_args; | |
f66c7cf8 | 2968 | ptrdiff_t i; |
db9f0278 JB |
2969 | |
2970 | QUIT; | |
ee830945 RS |
2971 | if ((consing_since_gc > gc_cons_threshold |
2972 | && consing_since_gc > gc_relative_threshold) | |
2973 | || | |
2974 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 2975 | Fgarbage_collect (); |
db9f0278 JB |
2976 | |
2977 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2978 | { | |
2979 | if (max_lisp_eval_depth < 100) | |
2980 | max_lisp_eval_depth = 100; | |
2981 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2982 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2983 | } |
2984 | ||
2985 | backtrace.next = backtrace_list; | |
2986 | backtrace_list = &backtrace; | |
2987 | backtrace.function = &args[0]; | |
2988 | backtrace.args = &args[1]; | |
2989 | backtrace.nargs = nargs - 1; | |
2990 | backtrace.evalargs = 0; | |
2991 | backtrace.debug_on_exit = 0; | |
2992 | ||
2993 | if (debug_on_next_call) | |
2994 | do_debug_on_call (Qlambda); | |
2995 | ||
fff3ff9c KS |
2996 | CHECK_CONS_LIST (); |
2997 | ||
8788120f KS |
2998 | original_fun = args[0]; |
2999 | ||
db9f0278 JB |
3000 | retry: |
3001 | ||
8788120f KS |
3002 | /* Optimize for no indirection. */ |
3003 | fun = original_fun; | |
3004 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
3005 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
3006 | fun = indirect_function (fun); | |
db9f0278 | 3007 | |
90165123 | 3008 | if (SUBRP (fun)) |
db9f0278 | 3009 | { |
ef1b0ba7 | 3010 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
3011 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
3012 | { | |
a631e24c | 3013 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 3014 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
3015 | } |
3016 | ||
ef1b0ba7 | 3017 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 3018 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 3019 | |
ef1b0ba7 SM |
3020 | else if (XSUBR (fun)->max_args == MANY) |
3021 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 3022 | else |
db9f0278 | 3023 | { |
ef1b0ba7 SM |
3024 | if (XSUBR (fun)->max_args > numargs) |
3025 | { | |
3026 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
3027 | memcpy (internal_args, args + 1, numargs * sizeof (Lisp_Object)); | |
3028 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
3029 | internal_args[i] = Qnil; | |
3030 | } | |
3031 | else | |
3032 | internal_args = args + 1; | |
3033 | switch (XSUBR (fun)->max_args) | |
3034 | { | |
3035 | case 0: | |
3036 | val = (XSUBR (fun)->function.a0 ()); | |
3037 | break; | |
3038 | case 1: | |
3039 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
3040 | break; | |
3041 | case 2: | |
3042 | val = (XSUBR (fun)->function.a2 | |
3043 | (internal_args[0], internal_args[1])); | |
3044 | break; | |
3045 | case 3: | |
3046 | val = (XSUBR (fun)->function.a3 | |
3047 | (internal_args[0], internal_args[1], internal_args[2])); | |
3048 | break; | |
3049 | case 4: | |
3050 | val = (XSUBR (fun)->function.a4 | |
3051 | (internal_args[0], internal_args[1], internal_args[2], | |
3052 | internal_args[3])); | |
3053 | break; | |
3054 | case 5: | |
3055 | val = (XSUBR (fun)->function.a5 | |
3056 | (internal_args[0], internal_args[1], internal_args[2], | |
3057 | internal_args[3], internal_args[4])); | |
3058 | break; | |
3059 | case 6: | |
3060 | val = (XSUBR (fun)->function.a6 | |
3061 | (internal_args[0], internal_args[1], internal_args[2], | |
3062 | internal_args[3], internal_args[4], internal_args[5])); | |
3063 | break; | |
3064 | case 7: | |
3065 | val = (XSUBR (fun)->function.a7 | |
3066 | (internal_args[0], internal_args[1], internal_args[2], | |
3067 | internal_args[3], internal_args[4], internal_args[5], | |
3068 | internal_args[6])); | |
3069 | break; | |
3070 | ||
3071 | case 8: | |
3072 | val = (XSUBR (fun)->function.a8 | |
3073 | (internal_args[0], internal_args[1], internal_args[2], | |
3074 | internal_args[3], internal_args[4], internal_args[5], | |
3075 | internal_args[6], internal_args[7])); | |
3076 | break; | |
3077 | ||
3078 | default: | |
3079 | ||
3080 | /* If a subr takes more than 8 arguments without using MANY | |
3081 | or UNEVALLED, we need to extend this function to support it. | |
3082 | Until this is done, there is no way to call the function. */ | |
3083 | abort (); | |
3084 | } | |
db9f0278 JB |
3085 | } |
3086 | } | |
ef1b0ba7 | 3087 | else if (COMPILEDP (fun)) |
db9f0278 JB |
3088 | val = funcall_lambda (fun, numargs, args + 1); |
3089 | else | |
3090 | { | |
8788120f | 3091 | if (EQ (fun, Qunbound)) |
734d55a2 | 3092 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 3093 | if (!CONSP (fun)) |
734d55a2 KS |
3094 | xsignal1 (Qinvalid_function, original_fun); |
3095 | funcar = XCAR (fun); | |
90165123 | 3096 | if (!SYMBOLP (funcar)) |
734d55a2 | 3097 | xsignal1 (Qinvalid_function, original_fun); |
defb1411 SM |
3098 | if (EQ (funcar, Qlambda) |
3099 | || EQ (funcar, Qclosure)) | |
db9f0278 | 3100 | val = funcall_lambda (fun, numargs, args + 1); |
db9f0278 JB |
3101 | else if (EQ (funcar, Qautoload)) |
3102 | { | |
8788120f | 3103 | do_autoload (fun, original_fun); |
fff3ff9c | 3104 | CHECK_CONS_LIST (); |
db9f0278 JB |
3105 | goto retry; |
3106 | } | |
3107 | else | |
734d55a2 | 3108 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 3109 | } |
c1788fbc | 3110 | CHECK_CONS_LIST (); |
db9f0278 JB |
3111 | lisp_eval_depth--; |
3112 | if (backtrace.debug_on_exit) | |
3113 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
3114 | backtrace_list = backtrace.next; | |
3115 | return val; | |
3116 | } | |
3117 | \f | |
2f7c71a1 | 3118 | static Lisp_Object |
defb1411 | 3119 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
3120 | { |
3121 | Lisp_Object args_left; | |
f66c7cf8 | 3122 | ptrdiff_t i, numargs; |
db9f0278 JB |
3123 | register Lisp_Object *arg_vector; |
3124 | struct gcpro gcpro1, gcpro2, gcpro3; | |
db9f0278 | 3125 | register Lisp_Object tem; |
3a7a9129 | 3126 | USE_SAFE_ALLOCA; |
db9f0278 | 3127 | |
f66c7cf8 | 3128 | numargs = XFASTINT (Flength (args)); |
c5101a77 | 3129 | SAFE_ALLOCA_LISP (arg_vector, numargs); |
db9f0278 JB |
3130 | args_left = args; |
3131 | ||
3132 | GCPRO3 (*arg_vector, args_left, fun); | |
3133 | gcpro1.nvars = 0; | |
3134 | ||
c5101a77 | 3135 | for (i = 0; i < numargs; ) |
db9f0278 JB |
3136 | { |
3137 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
defb1411 | 3138 | tem = eval_sub (tem); |
db9f0278 JB |
3139 | arg_vector[i++] = tem; |
3140 | gcpro1.nvars = i; | |
3141 | } | |
3142 | ||
3143 | UNGCPRO; | |
3144 | ||
f07a954e SM |
3145 | backtrace_list->args = arg_vector; |
3146 | backtrace_list->nargs = i; | |
db9f0278 | 3147 | backtrace_list->evalargs = 0; |
c5101a77 | 3148 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
3149 | |
3150 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3151 | if (backtrace_list->debug_on_exit) | |
3152 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3153 | /* Don't do it again when we return to eval. */ | |
3154 | backtrace_list->debug_on_exit = 0; | |
3a7a9129 | 3155 | SAFE_FREE (); |
db9f0278 JB |
3156 | return tem; |
3157 | } | |
3158 | ||
3159 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
3160 | and return the result of evaluation. | |
3161 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3162 | ||
2901f1d1 | 3163 | static Lisp_Object |
f66c7cf8 | 3164 | funcall_lambda (Lisp_Object fun, ptrdiff_t nargs, |
c5101a77 | 3165 | register Lisp_Object *arg_vector) |
db9f0278 | 3166 | { |
defb1411 | 3167 | Lisp_Object val, syms_left, next, lexenv; |
aed13378 | 3168 | int count = SPECPDL_INDEX (); |
f66c7cf8 | 3169 | ptrdiff_t i; |
c5101a77 | 3170 | int optional, rest; |
db9f0278 | 3171 | |
90165123 | 3172 | if (CONSP (fun)) |
9ab90667 | 3173 | { |
defb1411 SM |
3174 | if (EQ (XCAR (fun), Qclosure)) |
3175 | { | |
3176 | fun = XCDR (fun); /* Drop `closure'. */ | |
3177 | lexenv = XCAR (fun); | |
23aba0ea | 3178 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
3179 | } |
3180 | else | |
3181 | lexenv = Qnil; | |
9ab90667 GM |
3182 | syms_left = XCDR (fun); |
3183 | if (CONSP (syms_left)) | |
3184 | syms_left = XCAR (syms_left); | |
3185 | else | |
734d55a2 | 3186 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3187 | } |
90165123 | 3188 | else if (COMPILEDP (fun)) |
defb1411 | 3189 | { |
798cb644 SM |
3190 | syms_left = AREF (fun, COMPILED_ARGLIST); |
3191 | if (INTEGERP (syms_left)) | |
876c194c SM |
3192 | /* A byte-code object with a non-nil `push args' slot means we |
3193 | shouldn't bind any arguments, instead just call the byte-code | |
3194 | interpreter directly; it will push arguments as necessary. | |
3195 | ||
3196 | Byte-code objects with either a non-existant, or a nil value for | |
3197 | the `push args' slot (the default), have dynamically-bound | |
3198 | arguments, and use the argument-binding code below instead (as do | |
3199 | all interpreted functions, even lexically bound ones). */ | |
3200 | { | |
3201 | /* If we have not actually read the bytecode string | |
3202 | and constants vector yet, fetch them from the file. */ | |
3203 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
3204 | Ffetch_bytecode (fun); | |
3205 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
3206 | AREF (fun, COMPILED_CONSTANTS), | |
3207 | AREF (fun, COMPILED_STACK_DEPTH), | |
798cb644 | 3208 | syms_left, |
876c194c SM |
3209 | nargs, arg_vector); |
3210 | } | |
defb1411 SM |
3211 | lexenv = Qnil; |
3212 | } | |
9ab90667 GM |
3213 | else |
3214 | abort (); | |
db9f0278 | 3215 | |
9ab90667 GM |
3216 | i = optional = rest = 0; |
3217 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3218 | { |
3219 | QUIT; | |
177c0ea7 | 3220 | |
9ab90667 | 3221 | next = XCAR (syms_left); |
8788120f | 3222 | if (!SYMBOLP (next)) |
734d55a2 | 3223 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3224 | |
db9f0278 JB |
3225 | if (EQ (next, Qand_rest)) |
3226 | rest = 1; | |
3227 | else if (EQ (next, Qand_optional)) | |
3228 | optional = 1; | |
db9f0278 | 3229 | else |
db9f0278 | 3230 | { |
e610eaca | 3231 | Lisp_Object arg; |
defb1411 SM |
3232 | if (rest) |
3233 | { | |
e610eaca | 3234 | arg = Flist (nargs - i, &arg_vector[i]); |
defb1411 SM |
3235 | i = nargs; |
3236 | } | |
3237 | else if (i < nargs) | |
e610eaca | 3238 | arg = arg_vector[i++]; |
b9598260 SM |
3239 | else if (!optional) |
3240 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3241 | else | |
e610eaca | 3242 | arg = Qnil; |
7200d79c | 3243 | |
b9598260 | 3244 | /* Bind the argument. */ |
876c194c | 3245 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 | 3246 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
e610eaca | 3247 | lexenv = Fcons (Fcons (next, arg), lexenv); |
b9598260 SM |
3248 | else |
3249 | /* Dynamically bind NEXT. */ | |
e610eaca | 3250 | specbind (next, arg); |
db9f0278 | 3251 | } |
db9f0278 JB |
3252 | } |
3253 | ||
9ab90667 | 3254 | if (!NILP (syms_left)) |
734d55a2 | 3255 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3256 | else if (i < nargs) |
734d55a2 | 3257 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3258 | |
b9598260 SM |
3259 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3260 | /* Instantiate a new lexical environment. */ | |
3261 | specbind (Qinternal_interpreter_environment, lexenv); | |
3262 | ||
90165123 | 3263 | if (CONSP (fun)) |
9ab90667 | 3264 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3265 | else |
ca248607 RS |
3266 | { |
3267 | /* If we have not actually read the bytecode string | |
3268 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3269 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3270 | Ffetch_bytecode (fun); |
b9598260 SM |
3271 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3272 | AREF (fun, COMPILED_CONSTANTS), | |
3273 | AREF (fun, COMPILED_STACK_DEPTH), | |
3274 | Qnil, 0, 0); | |
ca248607 | 3275 | } |
177c0ea7 | 3276 | |
db9f0278 JB |
3277 | return unbind_to (count, val); |
3278 | } | |
661c7d6e KH |
3279 | |
3280 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3281 | 1, 1, 0, |
3282 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3283 | (Lisp_Object object) |
661c7d6e KH |
3284 | { |
3285 | Lisp_Object tem; | |
3286 | ||
845975f5 | 3287 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3288 | { |
845975f5 | 3289 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3290 | if (!CONSP (tem)) |
845975f5 SM |
3291 | { |
3292 | tem = AREF (object, COMPILED_BYTECODE); | |
3293 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3294 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3295 | else |
3296 | error ("Invalid byte code"); | |
3297 | } | |
3ae565b3 SM |
3298 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3299 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3300 | } |
3301 | return object; | |
3302 | } | |
db9f0278 | 3303 | \f |
475545b5 | 3304 | static void |
d3da34e0 | 3305 | grow_specpdl (void) |
db9f0278 | 3306 | { |
aed13378 | 3307 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3308 | if (specpdl_size >= max_specpdl_size) |
3309 | { | |
3310 | if (max_specpdl_size < 400) | |
3311 | max_specpdl_size = 400; | |
3312 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3313 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3314 | } |
3315 | specpdl_size *= 2; | |
3316 | if (specpdl_size > max_specpdl_size) | |
3317 | specpdl_size = max_specpdl_size; | |
3318 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3319 | specpdl_ptr = specpdl + count; | |
3320 | } | |
3321 | ||
f6d62986 | 3322 | /* `specpdl_ptr->symbol' is a field which describes which variable is |
4e2db1fe SM |
3323 | let-bound, so it can be properly undone when we unbind_to. |
3324 | It can have the following two shapes: | |
3325 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3326 | a symbol that is not buffer-local (at least at the time | |
3327 | the let binding started). Note also that it should not be | |
3328 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3329 | to record V2 here). | |
3330 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3331 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3332 | which buffer is affected (or nil if the let-binding affects the | |
3333 | global value of the variable) and BUFFER tells us which buffer was | |
3334 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3335 | BUFFER did not yet have a buffer-local value). */ | |
3336 | ||
db9f0278 | 3337 | void |
d3da34e0 | 3338 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3339 | { |
ce5b453a SM |
3340 | struct Lisp_Symbol *sym; |
3341 | ||
3342 | eassert (!handling_signal); | |
db9f0278 | 3343 | |
b7826503 | 3344 | CHECK_SYMBOL (symbol); |
ce5b453a | 3345 | sym = XSYMBOL (symbol); |
db9f0278 JB |
3346 | if (specpdl_ptr == specpdl + specpdl_size) |
3347 | grow_specpdl (); | |
719177b3 | 3348 | |
ce5b453a SM |
3349 | start: |
3350 | switch (sym->redirect) | |
719177b3 | 3351 | { |
ce5b453a SM |
3352 | case SYMBOL_VARALIAS: |
3353 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3354 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3355 | /* The most common case is that of a non-constant symbol with a |
3356 | trivial value. Make that as fast as we can. */ | |
3357 | specpdl_ptr->symbol = symbol; | |
3358 | specpdl_ptr->old_value = SYMBOL_VAL (sym); | |
3359 | specpdl_ptr->func = NULL; | |
3360 | ++specpdl_ptr; | |
3361 | if (!sym->constant) | |
3362 | SET_SYMBOL_VAL (sym, value); | |
3363 | else | |
3364 | set_internal (symbol, value, Qnil, 1); | |
3365 | break; | |
4e2db1fe SM |
3366 | case SYMBOL_LOCALIZED: |
3367 | if (SYMBOL_BLV (sym)->frame_local) | |
3368 | error ("Frame-local vars cannot be let-bound"); | |
3369 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3370 | { |
3371 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3372 | specpdl_ptr->func = 0; | |
3373 | specpdl_ptr->old_value = ovalue; | |
3374 | ||
3375 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3376 | || (EQ (SYMBOL_BLV (sym)->where, | |
3377 | SYMBOL_BLV (sym)->frame_local ? | |
3378 | Fselected_frame () : Fcurrent_buffer ()))); | |
3379 | ||
3380 | if (sym->redirect == SYMBOL_LOCALIZED | |
3381 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3382 | { | |
3383 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3384 | ||
3385 | /* For a local variable, record both the symbol and which | |
3386 | buffer's or frame's value we are saving. */ | |
3387 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3388 | { | |
3389 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3390 | || (BLV_FOUND (SYMBOL_BLV (sym)) | |
3391 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); | |
3392 | where = cur_buf; | |
3393 | } | |
3394 | else if (sym->redirect == SYMBOL_LOCALIZED | |
3395 | && BLV_FOUND (SYMBOL_BLV (sym))) | |
3396 | where = SYMBOL_BLV (sym)->where; | |
3397 | else | |
3398 | where = Qnil; | |
3399 | ||
3400 | /* We're not using the `unused' slot in the specbinding | |
3401 | structure because this would mean we have to do more | |
3402 | work for simple variables. */ | |
3403 | /* FIXME: The third value `current_buffer' is only used in | |
3404 | let_shadows_buffer_binding_p which is itself only used | |
3405 | in set_internal for local_if_set. */ | |
4e2db1fe | 3406 | eassert (NILP (where) || EQ (where, cur_buf)); |
ce5b453a SM |
3407 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, cur_buf)); |
3408 | ||
3409 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3410 | buffer-local value here, make the `let' change the global | |
3411 | value by changing the value of SYMBOL in all buffers not | |
3412 | having their own value. This is consistent with what | |
3413 | happens with other buffer-local variables. */ | |
3414 | if (NILP (where) | |
3415 | && sym->redirect == SYMBOL_FORWARDED) | |
3416 | { | |
3417 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3418 | ++specpdl_ptr; | |
3419 | Fset_default (symbol, value); | |
3420 | return; | |
3421 | } | |
3422 | } | |
3423 | else | |
3424 | specpdl_ptr->symbol = symbol; | |
3425 | ||
3426 | specpdl_ptr++; | |
94b612ad | 3427 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3428 | break; |
3429 | } | |
3430 | default: abort (); | |
9ab90667 | 3431 | } |
db9f0278 JB |
3432 | } |
3433 | ||
3434 | void | |
d3da34e0 | 3435 | record_unwind_protect (Lisp_Object (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3436 | { |
9ba8e10d CY |
3437 | eassert (!handling_signal); |
3438 | ||
db9f0278 JB |
3439 | if (specpdl_ptr == specpdl + specpdl_size) |
3440 | grow_specpdl (); | |
3441 | specpdl_ptr->func = function; | |
3442 | specpdl_ptr->symbol = Qnil; | |
3443 | specpdl_ptr->old_value = arg; | |
3444 | specpdl_ptr++; | |
3445 | } | |
3446 | ||
3447 | Lisp_Object | |
d3da34e0 | 3448 | unbind_to (int count, Lisp_Object value) |
db9f0278 | 3449 | { |
5a073f50 KS |
3450 | Lisp_Object quitf = Vquit_flag; |
3451 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3452 | |
5a073f50 | 3453 | GCPRO2 (value, quitf); |
db9f0278 JB |
3454 | Vquit_flag = Qnil; |
3455 | ||
3456 | while (specpdl_ptr != specpdl + count) | |
3457 | { | |
611a8f8c RS |
3458 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3459 | the work to unbind it. We decrement first | |
3460 | so that an error in unbinding won't try to unbind | |
3461 | the same entry again, and we copy the binding first | |
3462 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3463 | |
45f266dc DL |
3464 | struct specbinding this_binding; |
3465 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3466 | |
3467 | if (this_binding.func != 0) | |
3468 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3469 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3470 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3471 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3472 | bound a variable that had a buffer-local or frame-local |
3473 | binding. WHERE nil means that the variable had the default | |
0967b4b0 | 3474 | value when it was bound. CURRENT-BUFFER is the buffer that |
bb8e180f | 3475 | was current when the variable was bound. */ |
611a8f8c | 3476 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3477 | { |
eb700b82 | 3478 | Lisp_Object symbol, where; |
719177b3 | 3479 | |
611a8f8c RS |
3480 | symbol = XCAR (this_binding.symbol); |
3481 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3482 | |
eb700b82 | 3483 | if (NILP (where)) |
611a8f8c | 3484 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3485 | /* If `where' is non-nil, reset the value in the appropriate |
3486 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3487 | else if (BUFFERP (where) |
3488 | ? !NILP (Flocal_variable_p (symbol, where)) | |
3489 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) | |
3490 | set_internal (symbol, this_binding.old_value, where, 1); | |
719177b3 | 3491 | } |
94b612ad SM |
3492 | /* If variable has a trivial value (no forwarding), we can |
3493 | just set it. No need to check for constant symbols here, | |
3494 | since that was already done by specbind. */ | |
3495 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3496 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3497 | this_binding.old_value); | |
db9f0278 | 3498 | else |
94b612ad SM |
3499 | /* NOTE: we only ever come here if make_local_foo was used for |
3500 | the first time on this var within this let. */ | |
3501 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3502 | } |
177c0ea7 | 3503 | |
5a073f50 KS |
3504 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3505 | Vquit_flag = quitf; | |
db9f0278 JB |
3506 | |
3507 | UNGCPRO; | |
db9f0278 JB |
3508 | return value; |
3509 | } | |
b9598260 | 3510 | |
4a330052 | 3511 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3512 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3513 | A special variable is one that will be bound dynamically, even in a | |
3514 | context where binding is lexical by default. */) | |
c566235d | 3515 | (Lisp_Object symbol) |
b9598260 SM |
3516 | { |
3517 | CHECK_SYMBOL (symbol); | |
3518 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3519 | } | |
3520 | ||
db9f0278 | 3521 | \f |
db9f0278 | 3522 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3523 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3524 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3525 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 JB |
3526 | { |
3527 | register struct backtrace *backlist = backtrace_list; | |
3528 | register int i; | |
3529 | ||
b7826503 | 3530 | CHECK_NUMBER (level); |
db9f0278 JB |
3531 | |
3532 | for (i = 0; backlist && i < XINT (level); i++) | |
3533 | { | |
3534 | backlist = backlist->next; | |
3535 | } | |
3536 | ||
3537 | if (backlist) | |
265a9e55 | 3538 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3539 | |
3540 | return flag; | |
3541 | } | |
3542 | ||
3543 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3544 | doc: /* Print a trace of Lisp function calls currently active. |
3545 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3546 | (void) |
db9f0278 JB |
3547 | { |
3548 | register struct backtrace *backlist = backtrace_list; | |
db9f0278 JB |
3549 | Lisp_Object tail; |
3550 | Lisp_Object tem; | |
db9f0278 | 3551 | struct gcpro gcpro1; |
d4b6d95d | 3552 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3553 | |
d4b6d95d LMI |
3554 | if (NILP (Vprint_level)) |
3555 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 JB |
3556 | |
3557 | tail = Qnil; | |
3558 | GCPRO1 (tail); | |
3559 | ||
3560 | while (backlist) | |
3561 | { | |
3562 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
44f230aa | 3563 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3564 | { |
3565 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3566 | write_string ("\n", -1); |
db9f0278 JB |
3567 | } |
3568 | else | |
3569 | { | |
3570 | tem = *backlist->function; | |
f6d62986 | 3571 | Fprin1 (tem, Qnil); /* This can QUIT. */ |
db9f0278 | 3572 | write_string ("(", -1); |
44f230aa SM |
3573 | if (backlist->nargs == MANY) |
3574 | { /* FIXME: Can this happen? */ | |
a3eed478 | 3575 | int i; |
db9f0278 | 3576 | for (tail = *backlist->args, i = 0; |
265a9e55 | 3577 | !NILP (tail); |
a3eed478 | 3578 | tail = Fcdr (tail), i = 1) |
db9f0278 JB |
3579 | { |
3580 | if (i) write_string (" ", -1); | |
3581 | Fprin1 (Fcar (tail), Qnil); | |
3582 | } | |
3583 | } | |
3584 | else | |
3585 | { | |
f66c7cf8 | 3586 | ptrdiff_t i; |
db9f0278 JB |
3587 | for (i = 0; i < backlist->nargs; i++) |
3588 | { | |
3589 | if (i) write_string (" ", -1); | |
3590 | Fprin1 (backlist->args[i], Qnil); | |
3591 | } | |
3592 | } | |
b6703b02 | 3593 | write_string (")\n", -1); |
db9f0278 | 3594 | } |
db9f0278 JB |
3595 | backlist = backlist->next; |
3596 | } | |
3597 | ||
d4b6d95d | 3598 | Vprint_level = old_print_level; |
db9f0278 JB |
3599 | UNGCPRO; |
3600 | return Qnil; | |
3601 | } | |
3602 | ||
17401c97 | 3603 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3604 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3605 | If that frame has not evaluated the arguments yet (or is a special form), | |
3606 | the value is (nil FUNCTION ARG-FORMS...). | |
3607 | If that frame has evaluated its arguments and called its function already, | |
3608 | the value is (t FUNCTION ARG-VALUES...). | |
3609 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3610 | FUNCTION is whatever was supplied as car of evaluated list, | |
3611 | or a lambda expression for macro calls. | |
3612 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3613 | (Lisp_Object nframes) |
db9f0278 JB |
3614 | { |
3615 | register struct backtrace *backlist = backtrace_list; | |
5d5d959d | 3616 | register EMACS_INT i; |
db9f0278 JB |
3617 | Lisp_Object tem; |
3618 | ||
b7826503 | 3619 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3620 | |
3621 | /* Find the frame requested. */ | |
b6703b02 | 3622 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3623 | backlist = backlist->next; |
3624 | ||
3625 | if (!backlist) | |
3626 | return Qnil; | |
44f230aa | 3627 | if (backlist->nargs == UNEVALLED) |
db9f0278 JB |
3628 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); |
3629 | else | |
3630 | { | |
44f230aa | 3631 | if (backlist->nargs == MANY) /* FIXME: Can this happen? */ |
db9f0278 JB |
3632 | tem = *backlist->args; |
3633 | else | |
3634 | tem = Flist (backlist->nargs, backlist->args); | |
3635 | ||
3636 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3637 | } | |
3638 | } | |
a2ff3819 | 3639 | |
db9f0278 | 3640 | \f |
244ed907 | 3641 | #if BYTE_MARK_STACK |
4ce0541e | 3642 | void |
d3da34e0 | 3643 | mark_backtrace (void) |
4ce0541e SM |
3644 | { |
3645 | register struct backtrace *backlist; | |
f66c7cf8 | 3646 | ptrdiff_t i; |
4ce0541e SM |
3647 | |
3648 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3649 | { | |
3650 | mark_object (*backlist->function); | |
3651 | ||
44f230aa SM |
3652 | if (backlist->nargs == UNEVALLED |
3653 | || backlist->nargs == MANY) /* FIXME: Can this happen? */ | |
c5101a77 | 3654 | i = 1; |
4ce0541e | 3655 | else |
c5101a77 PE |
3656 | i = backlist->nargs; |
3657 | while (i--) | |
4ce0541e SM |
3658 | mark_object (backlist->args[i]); |
3659 | } | |
3660 | } | |
244ed907 | 3661 | #endif |
4ce0541e | 3662 | |
dfcf069d | 3663 | void |
d3da34e0 | 3664 | syms_of_eval (void) |
db9f0278 | 3665 | { |
29208e82 | 3666 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
82fc29a1 | 3667 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3668 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3669 | an error is signaled. |
3670 | You can safely use a value considerably larger than the default value, | |
3671 | if that proves inconveniently small. However, if you increase it too far, | |
3672 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3673 | |
29208e82 | 3674 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
9dbc9081 | 3675 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3676 | |
3677 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3678 | actual stack overflow in C, which would be fatal for Emacs. |
3679 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3680 | if that proves inconveniently small. However, if you increase it too far, |
3681 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3682 | |
29208e82 | 3683 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3684 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3685 | If the value is t, that means do an ordinary quit. |
3686 | If the value equals `throw-on-input', that means quit by throwing | |
3687 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3688 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3689 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3690 | Vquit_flag = Qnil; |
3691 | ||
29208e82 | 3692 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3693 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3694 | Note that `quit-flag' will still be set by typing C-g, | |
3695 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3696 | To prevent this happening, set `quit-flag' to nil | |
3697 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3698 | Vinhibit_quit = Qnil; |
3699 | ||
d67b4f80 | 3700 | Qinhibit_quit = intern_c_string ("inhibit-quit"); |
ad236261 JB |
3701 | staticpro (&Qinhibit_quit); |
3702 | ||
d67b4f80 | 3703 | Qautoload = intern_c_string ("autoload"); |
db9f0278 JB |
3704 | staticpro (&Qautoload); |
3705 | ||
d67b4f80 | 3706 | Qdebug_on_error = intern_c_string ("debug-on-error"); |
db9f0278 JB |
3707 | staticpro (&Qdebug_on_error); |
3708 | ||
d67b4f80 | 3709 | Qmacro = intern_c_string ("macro"); |
db9f0278 JB |
3710 | staticpro (&Qmacro); |
3711 | ||
d67b4f80 | 3712 | Qdeclare = intern_c_string ("declare"); |
d6edd563 | 3713 | staticpro (&Qdeclare); |
177c0ea7 | 3714 | |
db9f0278 JB |
3715 | /* Note that the process handling also uses Qexit, but we don't want |
3716 | to staticpro it twice, so we just do it here. */ | |
d67b4f80 | 3717 | Qexit = intern_c_string ("exit"); |
db9f0278 JB |
3718 | staticpro (&Qexit); |
3719 | ||
d67b4f80 | 3720 | Qinteractive = intern_c_string ("interactive"); |
db9f0278 JB |
3721 | staticpro (&Qinteractive); |
3722 | ||
d67b4f80 | 3723 | Qcommandp = intern_c_string ("commandp"); |
db9f0278 JB |
3724 | staticpro (&Qcommandp); |
3725 | ||
d67b4f80 | 3726 | Qdefun = intern_c_string ("defun"); |
db9f0278 JB |
3727 | staticpro (&Qdefun); |
3728 | ||
d67b4f80 | 3729 | Qand_rest = intern_c_string ("&rest"); |
db9f0278 JB |
3730 | staticpro (&Qand_rest); |
3731 | ||
d67b4f80 | 3732 | Qand_optional = intern_c_string ("&optional"); |
db9f0278 JB |
3733 | staticpro (&Qand_optional); |
3734 | ||
b9598260 SM |
3735 | Qclosure = intern_c_string ("closure"); |
3736 | staticpro (&Qclosure); | |
3737 | ||
d67b4f80 | 3738 | Qdebug = intern_c_string ("debug"); |
f01cbfdd RS |
3739 | staticpro (&Qdebug); |
3740 | ||
29208e82 | 3741 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
9dbc9081 PJ |
3742 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3743 | Does not apply to errors handled by `condition-case' or those | |
3744 | matched by `debug-ignored-errors'. | |
3745 | If the value is a list, an error only means to enter the debugger | |
3746 | if one of its condition symbols appears in the list. | |
3747 | When you evaluate an expression interactively, this variable | |
3748 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f CY |
3749 | The command `toggle-debug-on-error' toggles this. |
3750 | See also the variable `debug-on-quit'. */); | |
128c0f66 | 3751 | Vdebug_on_error = Qnil; |
db9f0278 | 3752 | |
29208e82 | 3753 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
9dbc9081 PJ |
3754 | doc: /* *List of errors for which the debugger should not be called. |
3755 | Each element may be a condition-name or a regexp that matches error messages. | |
3756 | If any element applies to a given error, that error skips the debugger | |
3757 | and just returns to top level. | |
3758 | This overrides the variable `debug-on-error'. | |
3759 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3760 | Vdebug_ignored_errors = Qnil; |
3761 | ||
29208e82 | 3762 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
82fc29a1 JB |
3763 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3764 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3765 | debug_on_quit = 0; |
3766 | ||
29208e82 | 3767 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3768 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3769 | |
29208e82 | 3770 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3771 | doc: /* Non-nil means debugger may continue execution. |
3772 | This is nil when the debugger is called under circumstances where it | |
3773 | might not be safe to continue. */); | |
dac204bc | 3774 | debugger_may_continue = 1; |
556d7314 | 3775 | |
29208e82 | 3776 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3777 | doc: /* Function to call to invoke debugger. |
3778 | If due to frame exit, args are `exit' and the value being returned; | |
3779 | this function's value will be returned instead of that. | |
3780 | If due to error, args are `error' and a list of the args to `signal'. | |
3781 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3782 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3783 | Vdebugger = Qnil; |
3784 | ||
29208e82 | 3785 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3786 | doc: /* If non-nil, this is a function for `signal' to call. |
3787 | It receives the same arguments that `signal' was given. | |
3788 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3789 | Vsignal_hook_function = Qnil; |
3790 | ||
29208e82 | 3791 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
9dbc9081 PJ |
3792 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3793 | Note that `debug-on-error', `debug-on-quit' and friends | |
3794 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3795 | Vdebug_on_signal = Qnil; |
61ede770 | 3796 | |
29208e82 | 3797 | DEFVAR_LISP ("macro-declaration-function", Vmacro_declaration_function, |
d6edd563 GM |
3798 | doc: /* Function to process declarations in a macro definition. |
3799 | The function will be called with two args MACRO and DECL. | |
3800 | MACRO is the name of the macro being defined. | |
3801 | DECL is a list `(declare ...)' containing the declarations. | |
3802 | The value the function returns is not used. */); | |
3803 | Vmacro_declaration_function = Qnil; | |
3804 | ||
b38b1ec0 SM |
3805 | /* When lexical binding is being used, |
3806 | vinternal_interpreter_environment is non-nil, and contains an alist | |
3807 | of lexically-bound variable, or (t), indicating an empty | |
3808 | environment. The lisp name of this variable would be | |
3809 | `internal-interpreter-environment' if it weren't hidden. | |
3810 | Every element of this list can be either a cons (VAR . VAL) | |
3811 | specifying a lexical binding, or a single symbol VAR indicating | |
3812 | that this variable should use dynamic scoping. */ | |
b9598260 SM |
3813 | Qinternal_interpreter_environment |
3814 | = intern_c_string ("internal-interpreter-environment"); | |
3815 | staticpro (&Qinternal_interpreter_environment); | |
b38b1ec0 SM |
3816 | DEFVAR_LISP ("internal-interpreter-environment", |
3817 | Vinternal_interpreter_environment, | |
b9598260 SM |
3818 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
3819 | When lexical binding is not being used, this variable is nil. | |
3820 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3821 | alist of active lexical bindings. */); | |
3822 | Vinternal_interpreter_environment = Qnil; | |
b38b1ec0 SM |
3823 | /* Don't export this variable to Elisp, so noone can mess with it |
3824 | (Just imagine if someone makes it buffer-local). */ | |
3825 | Funintern (Qinternal_interpreter_environment, Qnil); | |
b9598260 | 3826 | |
d67b4f80 | 3827 | Vrun_hooks = intern_c_string ("run-hooks"); |
6e6e9f08 | 3828 | staticpro (&Vrun_hooks); |
db9f0278 JB |
3829 | |
3830 | staticpro (&Vautoload_queue); | |
3831 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3832 | staticpro (&Vsignaling_function); |
3833 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3834 | |
3835 | defsubr (&Sor); | |
3836 | defsubr (&Sand); | |
3837 | defsubr (&Sif); | |
3838 | defsubr (&Scond); | |
3839 | defsubr (&Sprogn); | |
3840 | defsubr (&Sprog1); | |
3841 | defsubr (&Sprog2); | |
3842 | defsubr (&Ssetq); | |
3843 | defsubr (&Squote); | |
3844 | defsubr (&Sfunction); | |
3845 | defsubr (&Sdefun); | |
3846 | defsubr (&Sdefmacro); | |
3847 | defsubr (&Sdefvar); | |
19cebf5a | 3848 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3849 | defsubr (&Sdefconst); |
3850 | defsubr (&Suser_variable_p); | |
3851 | defsubr (&Slet); | |
3852 | defsubr (&SletX); | |
3853 | defsubr (&Swhile); | |
3854 | defsubr (&Smacroexpand); | |
3855 | defsubr (&Scatch); | |
3856 | defsubr (&Sthrow); | |
3857 | defsubr (&Sunwind_protect); | |
3858 | defsubr (&Scondition_case); | |
3859 | defsubr (&Ssignal); | |
3860 | defsubr (&Sinteractive_p); | |
4b664e76 | 3861 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
3862 | defsubr (&Scommandp); |
3863 | defsubr (&Sautoload); | |
3864 | defsubr (&Seval); | |
3865 | defsubr (&Sapply); | |
3866 | defsubr (&Sfuncall); | |
ff936e53 SM |
3867 | defsubr (&Srun_hooks); |
3868 | defsubr (&Srun_hook_with_args); | |
3869 | defsubr (&Srun_hook_with_args_until_success); | |
3870 | defsubr (&Srun_hook_with_args_until_failure); | |
f6d62986 | 3871 | defsubr (&Srun_hook_wrapped); |
661c7d6e | 3872 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3873 | defsubr (&Sbacktrace_debug); |
3874 | defsubr (&Sbacktrace); | |
3875 | defsubr (&Sbacktrace_frame); | |
4a330052 | 3876 | defsubr (&Sspecial_variable_p); |
b9598260 | 3877 | defsubr (&Sfunctionp); |
db9f0278 | 3878 | } |