Commit | Line | Data |
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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
f4cfd81a | 2 | Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1999, 2000, 2001, |
bb8e180f AS |
3 | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
4 | Free Software Foundation, Inc. | |
db9f0278 JB |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
9ec0b715 | 8 | GNU Emacs is free software: you can redistribute it and/or modify |
db9f0278 | 9 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
db9f0278 JB |
12 | |
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
db9f0278 JB |
20 | |
21 | ||
18160b98 | 22 | #include <config.h> |
d7306fe6 | 23 | #include <setjmp.h> |
db9f0278 | 24 | #include "lisp.h" |
9ac0d9e0 | 25 | #include "blockinput.h" |
db9f0278 | 26 | #include "commands.h" |
1f98fa48 | 27 | #include "keyboard.h" |
3648c842 | 28 | #include "dispextern.h" |
94b612ad | 29 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 30 | |
b70e1a2b SM |
31 | #if HAVE_X_WINDOWS |
32 | #include "xterm.h" | |
33 | #endif | |
34 | ||
db9f0278 JB |
35 | /* This definition is duplicated in alloc.c and keyboard.c */ |
36 | /* Putting it in lisp.h makes cc bomb out! */ | |
37 | ||
38 | struct backtrace | |
4c576a83 GM |
39 | { |
40 | struct backtrace *next; | |
41 | Lisp_Object *function; | |
42 | Lisp_Object *args; /* Points to vector of args. */ | |
43 | int nargs; /* Length of vector. | |
daa37602 JB |
44 | If nargs is UNEVALLED, args points to slot holding |
45 | list of unevalled args */ | |
4c576a83 GM |
46 | char evalargs; |
47 | /* Nonzero means call value of debugger when done with this operation. */ | |
48 | char debug_on_exit; | |
49 | }; | |
db9f0278 JB |
50 | |
51 | struct backtrace *backtrace_list; | |
52 | ||
db9f0278 JB |
53 | struct catchtag *catchlist; |
54 | ||
15934ffa RS |
55 | #ifdef DEBUG_GCPRO |
56 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
57 | int gcpro_level; | |
58 | #endif | |
59 | ||
6fd797f5 | 60 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
ad236261 | 61 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
db9f0278 JB |
62 | Lisp_Object Qand_rest, Qand_optional; |
63 | Lisp_Object Qdebug_on_error; | |
d6edd563 | 64 | Lisp_Object Qdeclare; |
3c3ddb98 | 65 | Lisp_Object Qcurry; |
b9598260 SM |
66 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
67 | ||
f01cbfdd | 68 | Lisp_Object Qdebug; |
db9f0278 | 69 | |
6e6e9f08 RS |
70 | /* This holds either the symbol `run-hooks' or nil. |
71 | It is nil at an early stage of startup, and when Emacs | |
72 | is shutting down. */ | |
4c576a83 | 73 | |
db9f0278 JB |
74 | Lisp_Object Vrun_hooks; |
75 | ||
76 | /* Non-nil means record all fset's and provide's, to be undone | |
77 | if the file being autoloaded is not fully loaded. | |
78 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 79 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
80 | |
81 | Lisp_Object Vautoload_queue; | |
82 | ||
b9598260 SM |
83 | /* When lexical binding is being used, this is non-nil, and contains an |
84 | alist of lexically-bound variable, or t, indicating an empty | |
85 | environment. The lisp name of this variable is | |
86 | `internal-interpreter-lexical-environment'. */ | |
87 | ||
88 | Lisp_Object Vinternal_interpreter_environment; | |
89 | ||
db9f0278 | 90 | /* Current number of specbindings allocated in specpdl. */ |
4c576a83 | 91 | |
5816888b | 92 | EMACS_INT specpdl_size; |
db9f0278 JB |
93 | |
94 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 95 | |
db9f0278 JB |
96 | struct specbinding *specpdl; |
97 | ||
98 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 99 | |
ab837828 | 100 | struct specbinding *specpdl_ptr; |
db9f0278 JB |
101 | |
102 | /* Maximum size allowed for specpdl allocation */ | |
4c576a83 | 103 | |
31ade731 | 104 | EMACS_INT max_specpdl_size; |
db9f0278 JB |
105 | |
106 | /* Depth in Lisp evaluations and function calls. */ | |
4c576a83 | 107 | |
5816888b | 108 | EMACS_INT lisp_eval_depth; |
db9f0278 JB |
109 | |
110 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
4c576a83 | 111 | |
31ade731 | 112 | EMACS_INT max_lisp_eval_depth; |
db9f0278 JB |
113 | |
114 | /* Nonzero means enter debugger before next function call */ | |
4c576a83 | 115 | |
db9f0278 JB |
116 | int debug_on_next_call; |
117 | ||
1b1acc13 | 118 | /* Non-zero means debugger may continue. This is zero when the |
556d7314 GM |
119 | debugger is called during redisplay, where it might not be safe to |
120 | continue the interrupted redisplay. */ | |
121 | ||
122 | int debugger_may_continue; | |
123 | ||
128c0f66 | 124 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 125 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 126 | |
128c0f66 | 127 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 128 | |
128c0f66 | 129 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 130 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 131 | |
128c0f66 | 132 | Lisp_Object Vdebug_on_error; |
db9f0278 | 133 | |
fc950e09 | 134 | /* List of conditions and regexps specifying error messages which |
1b1acc13 | 135 | do not enter the debugger even if Vdebug_on_error says they should. */ |
4c576a83 | 136 | |
fc950e09 KH |
137 | Lisp_Object Vdebug_ignored_errors; |
138 | ||
61ede770 | 139 | /* Non-nil means call the debugger even if the error will be handled. */ |
4c576a83 | 140 | |
57a6e758 | 141 | Lisp_Object Vdebug_on_signal; |
61ede770 RS |
142 | |
143 | /* Hook for edebug to use. */ | |
4c576a83 | 144 | |
61ede770 RS |
145 | Lisp_Object Vsignal_hook_function; |
146 | ||
db9f0278 | 147 | /* Nonzero means enter debugger if a quit signal |
128c0f66 | 148 | is handled by the command loop's error handler. */ |
4c576a83 | 149 | |
db9f0278 JB |
150 | int debug_on_quit; |
151 | ||
be857679 | 152 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 153 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 154 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
155 | know that the debugger itself has an error, and we should just |
156 | signal the error instead of entering an infinite loop of debugger | |
157 | invocations. */ | |
4c576a83 | 158 | |
82da7701 | 159 | int when_entered_debugger; |
db9f0278 JB |
160 | |
161 | Lisp_Object Vdebugger; | |
162 | ||
a2ff3819 GM |
163 | /* The function from which the last `signal' was called. Set in |
164 | Fsignal. */ | |
165 | ||
166 | Lisp_Object Vsignaling_function; | |
167 | ||
4c576a83 GM |
168 | /* Set to non-zero while processing X events. Checked in Feval to |
169 | make sure the Lisp interpreter isn't called from a signal handler, | |
170 | which is unsafe because the interpreter isn't reentrant. */ | |
171 | ||
172 | int handling_signal; | |
173 | ||
d6edd563 GM |
174 | /* Function to process declarations in defmacro forms. */ |
175 | ||
176 | Lisp_Object Vmacro_declaration_function; | |
177 | ||
0ee81a0c SM |
178 | static Lisp_Object funcall_lambda (Lisp_Object, int, Lisp_Object *, |
179 | Lisp_Object); | |
f57e2426 | 180 | static void unwind_to_catch (struct catchtag *, Lisp_Object) NO_RETURN; |
873759d5 | 181 | \f |
dfcf069d | 182 | void |
d3da34e0 | 183 | init_eval_once (void) |
db9f0278 JB |
184 | { |
185 | specpdl_size = 50; | |
716acfce | 186 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 187 | specpdl_ptr = specpdl; |
6588243d | 188 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
0c747cb1 | 189 | max_specpdl_size = 1200; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 190 | max_lisp_eval_depth = 600; |
34d470ba RS |
191 | |
192 | Vrun_hooks = Qnil; | |
db9f0278 JB |
193 | } |
194 | ||
dfcf069d | 195 | void |
d3da34e0 | 196 | init_eval (void) |
db9f0278 JB |
197 | { |
198 | specpdl_ptr = specpdl; | |
199 | catchlist = 0; | |
200 | handlerlist = 0; | |
201 | backtrace_list = 0; | |
202 | Vquit_flag = Qnil; | |
203 | debug_on_next_call = 0; | |
204 | lisp_eval_depth = 0; | |
87e21fbd | 205 | #ifdef DEBUG_GCPRO |
15934ffa | 206 | gcpro_level = 0; |
87e21fbd | 207 | #endif |
be857679 | 208 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 209 | when_entered_debugger = -1; |
db9f0278 JB |
210 | } |
211 | ||
9f5903bb RS |
212 | /* unwind-protect function used by call_debugger. */ |
213 | ||
214 | static Lisp_Object | |
d3da34e0 | 215 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
216 | { |
217 | max_specpdl_size = XINT (XCAR (data)); | |
218 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 219 | return Qnil; |
9f5903bb RS |
220 | } |
221 | ||
222 | /* Call the Lisp debugger, giving it argument ARG. */ | |
223 | ||
db9f0278 | 224 | Lisp_Object |
d3da34e0 | 225 | call_debugger (Lisp_Object arg) |
db9f0278 | 226 | { |
3648c842 | 227 | int debug_while_redisplaying; |
aed13378 | 228 | int count = SPECPDL_INDEX (); |
3648c842 | 229 | Lisp_Object val; |
5816888b | 230 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 231 | |
9f5903bb RS |
232 | /* Temporarily bump up the stack limits, |
233 | so the debugger won't run out of stack. */ | |
177c0ea7 | 234 | |
9f5903bb RS |
235 | max_specpdl_size += 1; |
236 | record_unwind_protect (restore_stack_limits, | |
237 | Fcons (make_number (old_max), | |
238 | make_number (max_lisp_eval_depth))); | |
239 | max_specpdl_size = old_max; | |
240 | ||
241 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
242 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
243 | ||
244 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
245 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 246 | |
d148e14d | 247 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
248 | if (display_hourglass_p) |
249 | cancel_hourglass (); | |
237c23b0 GM |
250 | #endif |
251 | ||
db9f0278 | 252 | debug_on_next_call = 0; |
be857679 | 253 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
254 | |
255 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
256 | displayed if the debugger is invoked during redisplay. */ | |
257 | debug_while_redisplaying = redisplaying_p; | |
258 | redisplaying_p = 0; | |
556d7314 GM |
259 | specbind (intern ("debugger-may-continue"), |
260 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 261 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 262 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
263 | |
264 | #if 0 /* Binding this prevents execution of Lisp code during | |
265 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 266 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 267 | #endif |
177c0ea7 | 268 | |
3648c842 GM |
269 | val = apply1 (Vdebugger, arg); |
270 | ||
271 | /* Interrupting redisplay and resuming it later is not safe under | |
272 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 273 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
274 | if (debug_while_redisplaying) |
275 | Ftop_level (); | |
276 | ||
556d7314 | 277 | return unbind_to (count, val); |
db9f0278 JB |
278 | } |
279 | ||
dfcf069d | 280 | void |
d3da34e0 | 281 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
282 | { |
283 | debug_on_next_call = 0; | |
284 | backtrace_list->debug_on_exit = 1; | |
285 | call_debugger (Fcons (code, Qnil)); | |
286 | } | |
287 | \f | |
288 | /* NOTE!!! Every function that can call EVAL must protect its args | |
289 | and temporaries from garbage collection while it needs them. | |
290 | The definition of `For' shows what you have to do. */ | |
291 | ||
292 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
293 | doc: /* Eval args until one of them yields non-nil, then return that value. |
294 | The remaining args are not evalled at all. | |
295 | If all args return nil, return nil. | |
533eb34b | 296 | usage: (or CONDITIONS...) */) |
5842a27b | 297 | (Lisp_Object args) |
db9f0278 | 298 | { |
e509f168 | 299 | register Lisp_Object val = Qnil; |
db9f0278 JB |
300 | struct gcpro gcpro1; |
301 | ||
e509f168 | 302 | GCPRO1 (args); |
db9f0278 | 303 | |
e509f168 | 304 | while (CONSP (args)) |
db9f0278 | 305 | { |
e509f168 | 306 | val = Feval (XCAR (args)); |
265a9e55 | 307 | if (!NILP (val)) |
db9f0278 | 308 | break; |
e509f168 | 309 | args = XCDR (args); |
db9f0278 | 310 | } |
db9f0278 JB |
311 | |
312 | UNGCPRO; | |
313 | return val; | |
314 | } | |
315 | ||
316 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 317 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
318 | The remaining args are not evalled at all. |
319 | If no arg yields nil, return the last arg's value. | |
533eb34b | 320 | usage: (and CONDITIONS...) */) |
5842a27b | 321 | (Lisp_Object args) |
db9f0278 | 322 | { |
e509f168 | 323 | register Lisp_Object val = Qt; |
db9f0278 JB |
324 | struct gcpro gcpro1; |
325 | ||
e509f168 | 326 | GCPRO1 (args); |
db9f0278 | 327 | |
e509f168 | 328 | while (CONSP (args)) |
db9f0278 | 329 | { |
e509f168 | 330 | val = Feval (XCAR (args)); |
265a9e55 | 331 | if (NILP (val)) |
db9f0278 | 332 | break; |
e509f168 | 333 | args = XCDR (args); |
db9f0278 | 334 | } |
db9f0278 JB |
335 | |
336 | UNGCPRO; | |
337 | return val; | |
338 | } | |
339 | ||
340 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 341 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
342 | Returns the value of THEN or the value of the last of the ELSE's. |
343 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
344 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 345 | usage: (if COND THEN ELSE...) */) |
5842a27b | 346 | (Lisp_Object args) |
db9f0278 JB |
347 | { |
348 | register Lisp_Object cond; | |
349 | struct gcpro gcpro1; | |
350 | ||
351 | GCPRO1 (args); | |
352 | cond = Feval (Fcar (args)); | |
353 | UNGCPRO; | |
354 | ||
265a9e55 | 355 | if (!NILP (cond)) |
db9f0278 JB |
356 | return Feval (Fcar (Fcdr (args))); |
357 | return Fprogn (Fcdr (Fcdr (args))); | |
358 | } | |
359 | ||
360 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
361 | doc: /* Try each clause until one succeeds. |
362 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
363 | and, if the value is non-nil, this clause succeeds: | |
364 | then the expressions in BODY are evaluated and the last one's | |
365 | value is the value of the cond-form. | |
366 | If no clause succeeds, cond returns nil. | |
367 | If a clause has one element, as in (CONDITION), | |
368 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 369 | usage: (cond CLAUSES...) */) |
5842a27b | 370 | (Lisp_Object args) |
db9f0278 JB |
371 | { |
372 | register Lisp_Object clause, val; | |
373 | struct gcpro gcpro1; | |
374 | ||
375 | val = Qnil; | |
376 | GCPRO1 (args); | |
265a9e55 | 377 | while (!NILP (args)) |
db9f0278 JB |
378 | { |
379 | clause = Fcar (args); | |
380 | val = Feval (Fcar (clause)); | |
265a9e55 | 381 | if (!NILP (val)) |
db9f0278 | 382 | { |
03699b14 KR |
383 | if (!EQ (XCDR (clause), Qnil)) |
384 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
385 | break; |
386 | } | |
03699b14 | 387 | args = XCDR (args); |
db9f0278 JB |
388 | } |
389 | UNGCPRO; | |
390 | ||
391 | return val; | |
392 | } | |
393 | ||
394 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
9dbc9081 | 395 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 396 | usage: (progn BODY...) */) |
5842a27b | 397 | (Lisp_Object args) |
db9f0278 | 398 | { |
e509f168 | 399 | register Lisp_Object val = Qnil; |
db9f0278 JB |
400 | struct gcpro gcpro1; |
401 | ||
e509f168 | 402 | GCPRO1 (args); |
db9f0278 | 403 | |
e509f168 | 404 | while (CONSP (args)) |
db9f0278 | 405 | { |
e509f168 SM |
406 | val = Feval (XCAR (args)); |
407 | args = XCDR (args); | |
db9f0278 | 408 | } |
db9f0278 JB |
409 | |
410 | UNGCPRO; | |
411 | return val; | |
412 | } | |
413 | ||
414 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 415 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
416 | The value of FIRST is saved during the evaluation of the remaining args, |
417 | whose values are discarded. | |
7a25dc6d | 418 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 419 | (Lisp_Object args) |
db9f0278 JB |
420 | { |
421 | Lisp_Object val; | |
422 | register Lisp_Object args_left; | |
423 | struct gcpro gcpro1, gcpro2; | |
424 | register int argnum = 0; | |
425 | ||
9ac66b45 | 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 | { | |
435 | if (!(argnum++)) | |
bb8e180f | 436 | val = Feval (Fcar (args_left)); |
db9f0278 JB |
437 | else |
438 | Feval (Fcar (args_left)); | |
439 | args_left = Fcdr (args_left); | |
440 | } | |
265a9e55 | 441 | while (!NILP(args_left)); |
db9f0278 JB |
442 | |
443 | UNGCPRO; | |
444 | return val; | |
445 | } | |
446 | ||
447 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 448 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
449 | The value of FORM2 is saved during the evaluation of the |
450 | remaining args, whose values are discarded. | |
451 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 452 | (Lisp_Object args) |
db9f0278 JB |
453 | { |
454 | Lisp_Object val; | |
455 | register Lisp_Object args_left; | |
456 | struct gcpro gcpro1, gcpro2; | |
457 | register int argnum = -1; | |
458 | ||
459 | val = Qnil; | |
460 | ||
87d238ba | 461 | if (NILP (args)) |
db9f0278 JB |
462 | return Qnil; |
463 | ||
464 | args_left = args; | |
465 | val = Qnil; | |
466 | GCPRO2 (args, val); | |
467 | ||
468 | do | |
469 | { | |
470 | if (!(argnum++)) | |
bb8e180f | 471 | val = Feval (Fcar (args_left)); |
db9f0278 JB |
472 | else |
473 | Feval (Fcar (args_left)); | |
474 | args_left = Fcdr (args_left); | |
475 | } | |
87d238ba | 476 | while (!NILP (args_left)); |
db9f0278 JB |
477 | |
478 | UNGCPRO; | |
479 | return val; | |
480 | } | |
481 | ||
482 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
483 | doc: /* Set each SYM to the value of its VAL. |
484 | The symbols SYM are variables; they are literal (not evaluated). | |
485 | The values VAL are expressions; they are evaluated. | |
486 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
487 | The second VAL is not computed until after the first SYM is set, and so on; | |
488 | each VAL can use the new value of variables set earlier in the `setq'. | |
489 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 490 | usage: (setq [SYM VAL]...) */) |
5842a27b | 491 | (Lisp_Object args) |
db9f0278 JB |
492 | { |
493 | register Lisp_Object args_left; | |
b9598260 | 494 | register Lisp_Object val, sym, lex_binding; |
db9f0278 JB |
495 | struct gcpro gcpro1; |
496 | ||
1283140e | 497 | if (NILP (args)) |
db9f0278 JB |
498 | return Qnil; |
499 | ||
500 | args_left = args; | |
501 | GCPRO1 (args); | |
502 | ||
503 | do | |
504 | { | |
505 | val = Feval (Fcar (Fcdr (args_left))); | |
506 | sym = Fcar (args_left); | |
b9598260 SM |
507 | |
508 | if (!NILP (Vinternal_interpreter_environment) | |
509 | && SYMBOLP (sym) | |
510 | && !XSYMBOL (sym)->declared_special | |
511 | && !NILP (lex_binding = Fassq (sym, Vinternal_interpreter_environment))) | |
512 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ | |
513 | else | |
514 | Fset (sym, val); /* SYM is dynamically bound. */ | |
515 | ||
db9f0278 JB |
516 | args_left = Fcdr (Fcdr (args_left)); |
517 | } | |
265a9e55 | 518 | while (!NILP(args_left)); |
db9f0278 JB |
519 | |
520 | UNGCPRO; | |
521 | return val; | |
522 | } | |
177c0ea7 | 523 | |
db9f0278 | 524 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
525 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
526 | usage: (quote ARG) */) | |
5842a27b | 527 | (Lisp_Object args) |
db9f0278 | 528 | { |
1283140e RS |
529 | if (!NILP (Fcdr (args))) |
530 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
531 | return Fcar (args); |
532 | } | |
177c0ea7 | 533 | |
db9f0278 | 534 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
535 | doc: /* Like `quote', but preferred for objects which are functions. |
536 | In byte compilation, `function' causes its argument to be compiled. | |
537 | `quote' cannot do that. | |
538 | usage: (function ARG) */) | |
5842a27b | 539 | (Lisp_Object args) |
db9f0278 | 540 | { |
b9598260 SM |
541 | Lisp_Object quoted = XCAR (args); |
542 | ||
1283140e RS |
543 | if (!NILP (Fcdr (args))) |
544 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
b9598260 SM |
545 | |
546 | if (!NILP (Vinternal_interpreter_environment) | |
547 | && CONSP (quoted) | |
548 | && EQ (XCAR (quoted), Qlambda)) | |
549 | /* This is a lambda expression within a lexical environment; | |
550 | return an interpreted closure instead of a simple lambda. */ | |
551 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, quoted)); | |
552 | else | |
553 | /* Simply quote the argument. */ | |
554 | return quoted; | |
db9f0278 JB |
555 | } |
556 | ||
e0f331ab | 557 | |
db9f0278 | 558 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
84b17ab0 | 559 | doc: /* Return t if the containing function was run directly by user input. |
82fc29a1 JB |
560 | This means that the function was called with `call-interactively' |
561 | \(which includes being called as the binding of a key) | |
84b17ab0 | 562 | and input is currently coming from the keyboard (not a keyboard macro), |
c63df42b RS |
563 | and Emacs is not running in batch mode (`noninteractive' is nil). |
564 | ||
565 | The only known proper use of `interactive-p' is in deciding whether to | |
566 | display a helpful message, or how to display it. If you're thinking | |
567 | of using it for any other purpose, it is quite likely that you're | |
568 | making a mistake. Think: what do you want to do when the command is | |
569 | called from a keyboard macro? | |
570 | ||
84b17ab0 CY |
571 | To test whether your function was called with `call-interactively', |
572 | either (i) add an extra optional argument and give it an `interactive' | |
573 | spec that specifies non-nil unconditionally (such as \"p\"); or (ii) | |
574 | use `called-interactively-p'. */) | |
5842a27b | 575 | (void) |
db9f0278 | 576 | { |
b9598260 | 577 | return interactive_p (1) ? Qt : Qnil; |
e0f331ab GM |
578 | } |
579 | ||
580 | ||
9d28c33e | 581 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 1, 0, |
84b17ab0 | 582 | doc: /* Return t if the containing function was called by `call-interactively'. |
9d28c33e SM |
583 | If KIND is `interactive', then only return t if the call was made |
584 | interactively by the user, i.e. not in `noninteractive' mode nor | |
585 | when `executing-kbd-macro'. | |
586 | If KIND is `any', on the other hand, it will return t for any kind of | |
587 | interactive call, including being called as the binding of a key, or | |
588 | from a keyboard macro, or in `noninteractive' mode. | |
589 | ||
590 | The only known proper use of `interactive' for KIND is in deciding | |
591 | whether to display a helpful message, or how to display it. If you're | |
592 | thinking of using it for any other purpose, it is quite likely that | |
593 | you're making a mistake. Think: what do you want to do when the | |
594 | command is called from a keyboard macro? | |
84b17ab0 CY |
595 | |
596 | This function is meant for implementing advice and other | |
597 | function-modifying features. Instead of using this, it is sometimes | |
598 | cleaner to give your function an extra optional argument whose | |
599 | `interactive' spec specifies non-nil unconditionally (\"p\" is a good | |
9d28c33e | 600 | way to do this), or via (not (or executing-kbd-macro noninteractive)). */) |
5842a27b | 601 | (Lisp_Object kind) |
c63df42b | 602 | { |
9d28c33e SM |
603 | return ((INTERACTIVE || !EQ (kind, intern ("interactive"))) |
604 | && interactive_p (1)) ? Qt : Qnil; | |
c63df42b RS |
605 | } |
606 | ||
607 | ||
608 | /* Return 1 if function in which this appears was called using | |
609 | call-interactively. | |
e0f331ab GM |
610 | |
611 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
612 | called is a built-in. */ | |
613 | ||
614 | int | |
d3da34e0 | 615 | interactive_p (int exclude_subrs_p) |
e0f331ab GM |
616 | { |
617 | struct backtrace *btp; | |
618 | Lisp_Object fun; | |
db9f0278 | 619 | |
db9f0278 | 620 | btp = backtrace_list; |
daa37602 JB |
621 | |
622 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 623 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 624 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
625 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
626 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 627 | btp = btp->next; |
daa37602 JB |
628 | |
629 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
630 | may be a frame for Fbytecode at the top level. In any version of |
631 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
632 | inside catch and condition-case. Skip past them. | |
daa37602 | 633 | |
4402a9ed | 634 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 635 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
636 | while (btp |
637 | && (EQ (*btp->function, Qbytecode) | |
638 | || btp->nargs == UNEVALLED)) | |
a6e3fa71 JB |
639 | btp = btp->next; |
640 | ||
daa37602 JB |
641 | /* btp now points at the frame of the innermost function that isn't |
642 | a special form, ignoring frames for Finteractive_p and/or | |
643 | Fbytecode at the top. If this frame is for a built-in function | |
644 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 645 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
646 | if (exclude_subrs_p && SUBRP (fun)) |
647 | return 0; | |
177c0ea7 | 648 | |
db9f0278 JB |
649 | /* btp points to the frame of a Lisp function that called interactive-p. |
650 | Return t if that function was called interactively. */ | |
651 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
652 | return 1; |
653 | return 0; | |
db9f0278 JB |
654 | } |
655 | ||
e0f331ab | 656 | |
db9f0278 | 657 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
658 | doc: /* Define NAME as a function. |
659 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
660 | See also the function `interactive'. | |
7a25dc6d | 661 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
5842a27b | 662 | (Lisp_Object args) |
db9f0278 JB |
663 | { |
664 | register Lisp_Object fn_name; | |
665 | register Lisp_Object defn; | |
666 | ||
667 | fn_name = Fcar (args); | |
6992a868 | 668 | CHECK_SYMBOL (fn_name); |
db9f0278 | 669 | defn = Fcons (Qlambda, Fcdr (args)); |
b9598260 SM |
670 | if (! NILP (Vinternal_interpreter_environment)) |
671 | defn = Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, defn)); | |
265a9e55 | 672 | if (!NILP (Vpurify_flag)) |
db9f0278 | 673 | defn = Fpurecopy (defn); |
f58e9f8c RS |
674 | if (CONSP (XSYMBOL (fn_name)->function) |
675 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
676 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 677 | Ffset (fn_name, defn); |
6fd797f5 | 678 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
679 | return fn_name; |
680 | } | |
681 | ||
682 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 683 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
684 | The actual definition looks like |
685 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
686 | When the macro is called, as in (NAME ARGS...), |
687 | the function (lambda ARGLIST BODY...) is applied to | |
688 | the list ARGS... as it appears in the expression, | |
689 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
690 | |
691 | DECL is a declaration, optional, which can specify how to indent | |
4ba50634 JPW |
692 | calls to this macro, how Edebug should handle it, and which argument |
693 | should be treated as documentation. It looks like this: | |
0654d6e3 RS |
694 | (declare SPECS...) |
695 | The elements can look like this: | |
696 | (indent INDENT) | |
697 | Set NAME's `lisp-indent-function' property to INDENT. | |
698 | ||
e509f168 | 699 | (debug DEBUG) |
0654d6e3 | 700 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 701 | equivalent to writing a `def-edebug-spec' for the macro.) |
4ba50634 JPW |
702 | |
703 | (doc-string ELT) | |
704 | Set NAME's `doc-string-elt' property to ELT. | |
705 | ||
0654d6e3 | 706 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
5842a27b | 707 | (Lisp_Object args) |
db9f0278 JB |
708 | { |
709 | register Lisp_Object fn_name; | |
710 | register Lisp_Object defn; | |
d6edd563 | 711 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
712 | |
713 | fn_name = Fcar (args); | |
8e975df9 | 714 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
715 | lambda_list = Fcar (Fcdr (args)); |
716 | tail = Fcdr (Fcdr (args)); | |
717 | ||
718 | doc = Qnil; | |
719 | if (STRINGP (Fcar (tail))) | |
720 | { | |
e509f168 SM |
721 | doc = XCAR (tail); |
722 | tail = XCDR (tail); | |
d6edd563 GM |
723 | } |
724 | ||
0193499f SM |
725 | if (CONSP (Fcar (tail)) |
726 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
d6edd563 GM |
727 | { |
728 | if (!NILP (Vmacro_declaration_function)) | |
729 | { | |
730 | struct gcpro gcpro1; | |
731 | GCPRO1 (args); | |
732 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
733 | UNGCPRO; | |
734 | } | |
177c0ea7 | 735 | |
d6edd563 GM |
736 | tail = Fcdr (tail); |
737 | } | |
738 | ||
739 | if (NILP (doc)) | |
740 | tail = Fcons (lambda_list, tail); | |
741 | else | |
742 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
b9598260 SM |
743 | |
744 | defn = Fcons (Qlambda, tail); | |
745 | if (! NILP (Vinternal_interpreter_environment)) | |
746 | defn = Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, defn)); | |
747 | defn = Fcons (Qmacro, defn); | |
177c0ea7 | 748 | |
265a9e55 | 749 | if (!NILP (Vpurify_flag)) |
db9f0278 | 750 | defn = Fpurecopy (defn); |
f58e9f8c RS |
751 | if (CONSP (XSYMBOL (fn_name)->function) |
752 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
753 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 754 | Ffset (fn_name, defn); |
6fd797f5 | 755 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
756 | return fn_name; |
757 | } | |
758 | ||
19cebf5a | 759 | |
1848d15d | 760 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 761 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 762 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 763 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
764 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
765 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
766 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
767 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 768 | The return value is BASE-VARIABLE. */) |
5842a27b | 769 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
770 | { |
771 | struct Lisp_Symbol *sym; | |
1848d15d | 772 | |
4a9308b8 JB |
773 | CHECK_SYMBOL (new_alias); |
774 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 775 | |
4a9308b8 | 776 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
777 | |
778 | if (sym->constant) | |
178f2507 SM |
779 | /* Not sure why, but why not? */ |
780 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
781 | |
782 | switch (sym->redirect) | |
783 | { | |
784 | case SYMBOL_FORWARDED: | |
785 | error ("Cannot make an internal variable an alias"); | |
786 | case SYMBOL_LOCALIZED: | |
787 | error ("Don't know how to make a localized variable an alias"); | |
788 | } | |
789 | ||
dd60787c | 790 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
791 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
792 | so that old-code that affects n_a before the aliasing is setup | |
793 | still works. */ | |
794 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 795 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
796 | |
797 | { | |
798 | struct specbinding *p; | |
799 | ||
800 | for (p = specpdl_ptr - 1; p >= specpdl; p--) | |
801 | if (p->func == NULL | |
802 | && (EQ (new_alias, | |
803 | CONSP (p->symbol) ? XCAR (p->symbol) : p->symbol))) | |
804 | error ("Don't know how to make a let-bound variable an alias"); | |
805 | } | |
806 | ||
b9598260 | 807 | sym->declared_special = 1; |
ce5b453a SM |
808 | sym->redirect = SYMBOL_VARALIAS; |
809 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
810 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
811 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
812 | /* Even if docstring is nil: remove old docstring. */ |
813 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 814 | |
4a9308b8 | 815 | return base_variable; |
19cebf5a GM |
816 | } |
817 | ||
818 | ||
db9f0278 | 819 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 820 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
821 | You are not required to define a variable in order to use it, |
822 | but the definition can supply documentation and an initial value | |
823 | in a way that tags can recognize. | |
824 | ||
825 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
826 | If SYMBOL is buffer-local, its default value is what is set; | |
827 | buffer-local values are not affected. | |
828 | INITVALUE and DOCSTRING are optional. | |
829 | If DOCSTRING starts with *, this variable is identified as a user option. | |
830 | This means that M-x set-variable recognizes it. | |
831 | See also `user-variable-p'. | |
832 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
833 | |
834 | If SYMBOL has a local binding, then this form affects the local | |
835 | binding. This is usually not what you want. Thus, if you need to | |
836 | load a file defining variables, with this form or with `defconst' or | |
837 | `defcustom', you should always load that file _outside_ any bindings | |
838 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
839 | this respect.) | |
2df5238c | 840 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 841 | (Lisp_Object args) |
db9f0278 | 842 | { |
a42ba017 | 843 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
844 | |
845 | sym = Fcar (args); | |
a42ba017 RS |
846 | tail = Fcdr (args); |
847 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 848 | error ("Too many arguments"); |
a42ba017 | 849 | |
33568849 | 850 | tem = Fdefault_boundp (sym); |
a42ba017 | 851 | if (!NILP (tail)) |
db9f0278 | 852 | { |
1c9916a1 SM |
853 | if (SYMBOL_CONSTANT_P (sym)) |
854 | { | |
855 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
856 | Lisp_Object tem = Fcar (tail); | |
857 | if (! (CONSP (tem) | |
858 | && EQ (XCAR (tem), Qquote) | |
859 | && CONSP (XCDR (tem)) | |
860 | && EQ (XCAR (XCDR (tem)), sym))) | |
861 | error ("Constant symbol `%s' specified in defvar", | |
862 | SDATA (SYMBOL_NAME (sym))); | |
863 | } | |
864 | ||
265a9e55 | 865 | if (NILP (tem)) |
33568849 | 866 | Fset_default (sym, Feval (Fcar (tail))); |
d0bce91e SM |
867 | else |
868 | { /* Check if there is really a global binding rather than just a let | |
869 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 870 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
871 | while (--pdl >= specpdl) |
872 | { | |
873 | if (EQ (pdl->symbol, sym) && !pdl->func | |
874 | && EQ (pdl->old_value, Qunbound)) | |
875 | { | |
876 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
877 | SYMBOL_NAME (sym), 1); | |
878 | break; | |
879 | } | |
880 | } | |
881 | } | |
33568849 | 882 | tail = Fcdr (tail); |
e509f168 SM |
883 | tem = Fcar (tail); |
884 | if (!NILP (tem)) | |
33568849 | 885 | { |
33568849 SM |
886 | if (!NILP (Vpurify_flag)) |
887 | tem = Fpurecopy (tem); | |
888 | Fput (sym, Qvariable_documentation, tem); | |
889 | } | |
6fd797f5 | 890 | LOADHIST_ATTACH (sym); |
db9f0278 | 891 | } |
33568849 | 892 | else |
d7c1d0fc RS |
893 | /* Simple (defvar <var>) should not count as a definition at all. |
894 | It could get in the way of other definitions, and unloading this | |
895 | package could try to make the variable unbound. */ | |
addf35fd | 896 | ; |
b9598260 SM |
897 | |
898 | if (SYMBOLP (sym)) | |
899 | XSYMBOL (sym)->declared_special = 1; | |
addf35fd | 900 | |
db9f0278 JB |
901 | return sym; |
902 | } | |
903 | ||
904 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
905 | doc: /* Define SYMBOL as a constant variable. |
906 | The intent is that neither programs nor users should ever change this value. | |
907 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
908 | If SYMBOL is buffer-local, its default value is what is set; | |
909 | buffer-local values are not affected. | |
910 | DOCSTRING is optional. | |
733f68b6 LT |
911 | |
912 | If SYMBOL has a local binding, then this form sets the local binding's | |
913 | value. However, you should normally not make local bindings for | |
914 | variables defined with this form. | |
7a25dc6d | 915 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 916 | (Lisp_Object args) |
db9f0278 JB |
917 | { |
918 | register Lisp_Object sym, tem; | |
919 | ||
920 | sym = Fcar (args); | |
a42ba017 | 921 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 922 | error ("Too many arguments"); |
a42ba017 | 923 | |
1182a7cb DL |
924 | tem = Feval (Fcar (Fcdr (args))); |
925 | if (!NILP (Vpurify_flag)) | |
926 | tem = Fpurecopy (tem); | |
927 | Fset_default (sym, tem); | |
b9598260 | 928 | XSYMBOL (sym)->declared_special = 1; |
db9f0278 | 929 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 930 | if (!NILP (tem)) |
db9f0278 | 931 | { |
265a9e55 | 932 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
933 | tem = Fpurecopy (tem); |
934 | Fput (sym, Qvariable_documentation, tem); | |
935 | } | |
873759d5 | 936 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 937 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
938 | return sym; |
939 | } | |
940 | ||
606cdb89 JB |
941 | /* Error handler used in Fuser_variable_p. */ |
942 | static Lisp_Object | |
d3da34e0 | 943 | user_variable_p_eh (Lisp_Object ignore) |
606cdb89 JB |
944 | { |
945 | return Qnil; | |
946 | } | |
947 | ||
40a69fac SM |
948 | static Lisp_Object |
949 | lisp_indirect_variable (Lisp_Object sym) | |
950 | { | |
951 | XSETSYMBOL (sym, indirect_variable (XSYMBOL (sym))); | |
952 | return sym; | |
953 | } | |
954 | ||
db9f0278 | 955 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 956 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 957 | \(The alternative is a variable used internally in a Lisp program.) |
606cdb89 JB |
958 | A variable is a user variable if |
959 | \(1) the first character of its documentation is `*', or | |
960 | \(2) it is customizable (its property list contains a non-nil value | |
961 | of `standard-value' or `custom-autoload'), or | |
962 | \(3) it is an alias for another user variable. | |
963 | Return nil if VARIABLE is an alias and there is a loop in the | |
964 | chain of symbols. */) | |
5842a27b | 965 | (Lisp_Object variable) |
db9f0278 JB |
966 | { |
967 | Lisp_Object documentation; | |
177c0ea7 | 968 | |
5e78e475 RS |
969 | if (!SYMBOLP (variable)) |
970 | return Qnil; | |
971 | ||
606cdb89 | 972 | /* If indirect and there's an alias loop, don't check anything else. */ |
ce5b453a | 973 | if (XSYMBOL (variable)->redirect == SYMBOL_VARALIAS |
40a69fac | 974 | && NILP (internal_condition_case_1 (lisp_indirect_variable, variable, |
bb8e180f | 975 | Qt, user_variable_p_eh))) |
606cdb89 JB |
976 | return Qnil; |
977 | ||
978 | while (1) | |
979 | { | |
980 | documentation = Fget (variable, Qvariable_documentation); | |
981 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
bb8e180f | 982 | return Qt; |
606cdb89 | 983 | if (STRINGP (documentation) |
bb8e180f AS |
984 | && ((unsigned char) SREF (documentation, 0) == '*')) |
985 | return Qt; | |
606cdb89 JB |
986 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ |
987 | if (CONSP (documentation) | |
bb8e180f AS |
988 | && STRINGP (XCAR (documentation)) |
989 | && INTEGERP (XCDR (documentation)) | |
990 | && XINT (XCDR (documentation)) < 0) | |
991 | return Qt; | |
606cdb89 JB |
992 | /* Customizable? See `custom-variable-p'. */ |
993 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
bb8e180f AS |
994 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) |
995 | return Qt; | |
606cdb89 | 996 | |
ce5b453a | 997 | if (!(XSYMBOL (variable)->redirect == SYMBOL_VARALIAS)) |
bb8e180f | 998 | return Qnil; |
606cdb89 JB |
999 | |
1000 | /* An indirect variable? Let's follow the chain. */ | |
ce5b453a | 1001 | XSETSYMBOL (variable, SYMBOL_ALIAS (XSYMBOL (variable))); |
606cdb89 | 1002 | } |
177c0ea7 | 1003 | } |
db9f0278 JB |
1004 | \f |
1005 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1006 | doc: /* Bind variables according to VARLIST then eval BODY. |
1007 | The value of the last form in BODY is returned. | |
1008 | Each element of VARLIST is a symbol (which is bound to nil) | |
1009 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1010 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 1011 | usage: (let* VARLIST BODY...) */) |
5842a27b | 1012 | (Lisp_Object args) |
db9f0278 | 1013 | { |
b9598260 | 1014 | Lisp_Object varlist, var, val, elt, lexenv; |
aed13378 | 1015 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
1016 | struct gcpro gcpro1, gcpro2, gcpro3; |
1017 | ||
1018 | GCPRO3 (args, elt, varlist); | |
1019 | ||
b9598260 SM |
1020 | lexenv = Vinternal_interpreter_environment; |
1021 | ||
db9f0278 | 1022 | varlist = Fcar (args); |
b9598260 | 1023 | while (CONSP (varlist)) |
db9f0278 JB |
1024 | { |
1025 | QUIT; | |
b9598260 SM |
1026 | |
1027 | elt = XCAR (varlist); | |
90165123 | 1028 | if (SYMBOLP (elt)) |
b9598260 SM |
1029 | { |
1030 | var = elt; | |
1031 | val = Qnil; | |
1032 | } | |
08564963 | 1033 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1034 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1035 | else |
1036 | { | |
b9598260 | 1037 | var = Fcar (elt); |
db9f0278 | 1038 | val = Feval (Fcar (Fcdr (elt))); |
db9f0278 | 1039 | } |
b9598260 SM |
1040 | |
1041 | if (!NILP (lexenv) && SYMBOLP (var) && !XSYMBOL (var)->declared_special) | |
1042 | /* Lexically bind VAR by adding it to the interpreter's binding | |
1043 | alist. */ | |
1044 | { | |
1045 | lexenv = Fcons (Fcons (var, val), lexenv); | |
1046 | specbind (Qinternal_interpreter_environment, lexenv); | |
1047 | } | |
1048 | else | |
1049 | specbind (var, val); | |
1050 | ||
1051 | varlist = XCDR (varlist); | |
db9f0278 | 1052 | } |
b9598260 | 1053 | |
db9f0278 | 1054 | UNGCPRO; |
b9598260 | 1055 | |
db9f0278 | 1056 | val = Fprogn (Fcdr (args)); |
b9598260 | 1057 | |
db9f0278 JB |
1058 | return unbind_to (count, val); |
1059 | } | |
1060 | ||
1061 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1062 | doc: /* Bind variables according to VARLIST then eval BODY. |
1063 | The value of the last form in BODY is returned. | |
1064 | Each element of VARLIST is a symbol (which is bound to nil) | |
1065 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1066 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 1067 | usage: (let VARLIST BODY...) */) |
5842a27b | 1068 | (Lisp_Object args) |
db9f0278 | 1069 | { |
b9598260 | 1070 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 1071 | register Lisp_Object elt, varlist; |
aed13378 | 1072 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
1073 | register int argnum; |
1074 | struct gcpro gcpro1, gcpro2; | |
3a7a9129 | 1075 | USE_SAFE_ALLOCA; |
db9f0278 JB |
1076 | |
1077 | varlist = Fcar (args); | |
1078 | ||
1079 | /* Make space to hold the values to give the bound variables */ | |
1080 | elt = Flength (varlist); | |
b72e0717 | 1081 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 JB |
1082 | |
1083 | /* Compute the values and store them in `temps' */ | |
1084 | ||
1085 | GCPRO2 (args, *temps); | |
1086 | gcpro2.nvars = 0; | |
1087 | ||
67ee9f6e | 1088 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
1089 | { |
1090 | QUIT; | |
67ee9f6e | 1091 | elt = XCAR (varlist); |
90165123 | 1092 | if (SYMBOLP (elt)) |
db9f0278 | 1093 | temps [argnum++] = Qnil; |
08564963 | 1094 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1095 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1096 | else |
1097 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
1098 | gcpro2.nvars = argnum; | |
1099 | } | |
1100 | UNGCPRO; | |
1101 | ||
b9598260 SM |
1102 | lexenv = Vinternal_interpreter_environment; |
1103 | ||
db9f0278 | 1104 | varlist = Fcar (args); |
67ee9f6e | 1105 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 1106 | { |
b9598260 SM |
1107 | Lisp_Object var; |
1108 | ||
67ee9f6e | 1109 | elt = XCAR (varlist); |
b9598260 | 1110 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 1111 | tem = temps[argnum++]; |
b9598260 SM |
1112 | |
1113 | if (!NILP (lexenv) && SYMBOLP (var) && !XSYMBOL (var)->declared_special) | |
1114 | /* Lexically bind VAR by adding it to the lexenv alist. */ | |
1115 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 1116 | else |
b9598260 SM |
1117 | /* Dynamically bind VAR. */ |
1118 | specbind (var, tem); | |
db9f0278 JB |
1119 | } |
1120 | ||
b9598260 SM |
1121 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
1122 | /* Instantiate a new lexical environment. */ | |
1123 | specbind (Qinternal_interpreter_environment, lexenv); | |
1124 | ||
db9f0278 | 1125 | elt = Fprogn (Fcdr (args)); |
3a7a9129 | 1126 | SAFE_FREE (); |
db9f0278 JB |
1127 | return unbind_to (count, elt); |
1128 | } | |
1129 | ||
1130 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1131 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1132 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1133 | until TEST returns nil. | |
7a25dc6d | 1134 | usage: (while TEST BODY...) */) |
5842a27b | 1135 | (Lisp_Object args) |
db9f0278 | 1136 | { |
2b9bde76 | 1137 | Lisp_Object test, body; |
db9f0278 JB |
1138 | struct gcpro gcpro1, gcpro2; |
1139 | ||
1140 | GCPRO2 (test, body); | |
1141 | ||
1142 | test = Fcar (args); | |
1143 | body = Fcdr (args); | |
2b9bde76 | 1144 | while (!NILP (Feval (test))) |
db9f0278 JB |
1145 | { |
1146 | QUIT; | |
1147 | Fprogn (body); | |
1148 | } | |
1149 | ||
1150 | UNGCPRO; | |
1151 | return Qnil; | |
1152 | } | |
1153 | ||
1154 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1155 | doc: /* Return result of expanding macros at top level of FORM. |
1156 | If FORM is not a macro call, it is returned unchanged. | |
1157 | Otherwise, the macro is expanded and the expansion is considered | |
1158 | in place of FORM. When a non-macro-call results, it is returned. | |
1159 | ||
1160 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1161 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 1162 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 1163 | { |
23d6b5a6 | 1164 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1165 | register Lisp_Object expander, sym, def, tem; |
1166 | ||
1167 | while (1) | |
1168 | { | |
1169 | /* Come back here each time we expand a macro call, | |
1170 | in case it expands into another macro call. */ | |
90165123 | 1171 | if (!CONSP (form)) |
db9f0278 | 1172 | break; |
23d6b5a6 | 1173 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1174 | def = sym = XCAR (form); |
23d6b5a6 | 1175 | tem = Qnil; |
db9f0278 JB |
1176 | /* Trace symbols aliases to other symbols |
1177 | until we get a symbol that is not an alias. */ | |
90165123 | 1178 | while (SYMBOLP (def)) |
db9f0278 JB |
1179 | { |
1180 | QUIT; | |
23d6b5a6 | 1181 | sym = def; |
79e8bfbf | 1182 | tem = Fassq (sym, environment); |
265a9e55 | 1183 | if (NILP (tem)) |
db9f0278 JB |
1184 | { |
1185 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1186 | if (!EQ (def, Qunbound)) |
1187 | continue; | |
db9f0278 | 1188 | } |
23d6b5a6 | 1189 | break; |
db9f0278 | 1190 | } |
79e8bfbf | 1191 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1192 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1193 | if (NILP (tem)) |
db9f0278 | 1194 | { |
79e8bfbf | 1195 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1196 | Look at its function definition. */ |
90165123 | 1197 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
1198 | /* Not defined or definition not suitable */ |
1199 | break; | |
03699b14 | 1200 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1201 | { |
1202 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1203 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1204 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1205 | /* Yes, load it and try again. */ |
1206 | { | |
ca20916b RS |
1207 | struct gcpro gcpro1; |
1208 | GCPRO1 (form); | |
ee9ee63c | 1209 | do_autoload (def, sym); |
ca20916b | 1210 | UNGCPRO; |
ee9ee63c JB |
1211 | continue; |
1212 | } | |
1213 | else | |
db9f0278 | 1214 | break; |
db9f0278 | 1215 | } |
03699b14 | 1216 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1217 | break; |
03699b14 | 1218 | else expander = XCDR (def); |
db9f0278 JB |
1219 | } |
1220 | else | |
1221 | { | |
03699b14 | 1222 | expander = XCDR (tem); |
265a9e55 | 1223 | if (NILP (expander)) |
db9f0278 JB |
1224 | break; |
1225 | } | |
03699b14 | 1226 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1227 | } |
1228 | return form; | |
1229 | } | |
1230 | \f | |
1231 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1232 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1233 | TAG is evalled to get the tag to use; it must not be nil. | |
1234 | ||
1235 | Then the BODY is executed. | |
1d632ccf | 1236 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1237 | If no throw happens, `catch' returns the value of the last BODY form. |
1238 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1239 | usage: (catch TAG BODY...) */) |
5842a27b | 1240 | (Lisp_Object args) |
db9f0278 JB |
1241 | { |
1242 | register Lisp_Object tag; | |
1243 | struct gcpro gcpro1; | |
1244 | ||
1245 | GCPRO1 (args); | |
1246 | tag = Feval (Fcar (args)); | |
1247 | UNGCPRO; | |
1248 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1249 | } | |
1250 | ||
1251 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1252 | FUNC should return a Lisp_Object. | |
1253 | This is how catches are done from within C code. */ | |
1254 | ||
1255 | Lisp_Object | |
d3da34e0 | 1256 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1257 | { |
1258 | /* This structure is made part of the chain `catchlist'. */ | |
1259 | struct catchtag c; | |
1260 | ||
1261 | /* Fill in the components of c, and put it on the list. */ | |
1262 | c.next = catchlist; | |
1263 | c.tag = tag; | |
1264 | c.val = Qnil; | |
1265 | c.backlist = backtrace_list; | |
1266 | c.handlerlist = handlerlist; | |
1267 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1268 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1269 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1270 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1271 | c.gcpro = gcprolist; |
bcf28080 | 1272 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1273 | catchlist = &c; |
1274 | ||
1275 | /* Call FUNC. */ | |
1276 | if (! _setjmp (c.jmp)) | |
1277 | c.val = (*func) (arg); | |
1278 | ||
1279 | /* Throw works by a longjmp that comes right here. */ | |
1280 | catchlist = c.next; | |
1281 | return c.val; | |
1282 | } | |
1283 | ||
ba410f40 JB |
1284 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1285 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1286 | |
ba410f40 JB |
1287 | This is the guts Fthrow and Fsignal; they differ only in the way |
1288 | they choose the catch tag to throw to. A catch tag for a | |
1289 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1290 | |
ba410f40 JB |
1291 | Before each catch is discarded, unbind all special bindings and |
1292 | execute all unwind-protect clauses made above that catch. Unwind | |
1293 | the handler stack as we go, so that the proper handlers are in | |
1294 | effect for each unwind-protect clause we run. At the end, restore | |
1295 | some static info saved in CATCH, and longjmp to the location | |
1296 | specified in the | |
1297 | ||
1298 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1299 | |
1300 | static void | |
d3da34e0 | 1301 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 JB |
1302 | { |
1303 | register int last_time; | |
1304 | ||
ba410f40 JB |
1305 | /* Save the value in the tag. */ |
1306 | catch->val = value; | |
1307 | ||
0b31741c | 1308 | /* Restore certain special C variables. */ |
1cdc3155 | 1309 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1310 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1311 | handling_signal = 0; |
69bbd6bd | 1312 | immediate_quit = 0; |
82da7701 | 1313 | |
db9f0278 JB |
1314 | do |
1315 | { | |
1316 | last_time = catchlist == catch; | |
82da7701 JB |
1317 | |
1318 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1319 | handlers. */ |
db9f0278 JB |
1320 | unbind_to (catchlist->pdlcount, Qnil); |
1321 | handlerlist = catchlist->handlerlist; | |
1322 | catchlist = catchlist->next; | |
1323 | } | |
1324 | while (! last_time); | |
1325 | ||
a2a103bb | 1326 | #if HAVE_X_WINDOWS |
88019a63 RS |
1327 | /* If x_catch_errors was done, turn it off now. |
1328 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 | 1329 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
bb8e180f AS |
1330 | The catch must remain in effect during that delicate |
1331 | state. --lorentey */ | |
88019a63 | 1332 | x_fully_uncatch_errors (); |
e6aee454 | 1333 | #endif |
a2a103bb | 1334 | #endif |
88019a63 | 1335 | |
bcf28080 | 1336 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1337 | gcprolist = catch->gcpro; |
15934ffa RS |
1338 | #ifdef DEBUG_GCPRO |
1339 | if (gcprolist != 0) | |
1340 | gcpro_level = gcprolist->level + 1; | |
1341 | else | |
1342 | gcpro_level = 0; | |
1343 | #endif | |
db9f0278 JB |
1344 | backtrace_list = catch->backlist; |
1345 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1346 | |
ba410f40 | 1347 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1348 | } |
1349 | ||
1350 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
9dbc9081 PJ |
1351 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1352 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1353 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1354 | { |
1355 | register struct catchtag *c; | |
1356 | ||
8788120f KS |
1357 | if (!NILP (tag)) |
1358 | for (c = catchlist; c; c = c->next) | |
1359 | { | |
1360 | if (EQ (c->tag, tag)) | |
1361 | unwind_to_catch (c, value); | |
1362 | } | |
734d55a2 | 1363 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1364 | } |
1365 | ||
1366 | ||
1367 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1368 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1369 | If BODYFORM completes normally, its value is returned | |
1370 | after executing the UNWINDFORMS. | |
1371 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1372 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1373 | (Lisp_Object args) |
db9f0278 JB |
1374 | { |
1375 | Lisp_Object val; | |
aed13378 | 1376 | int count = SPECPDL_INDEX (); |
db9f0278 | 1377 | |
04b28167 | 1378 | record_unwind_protect (Fprogn, Fcdr (args)); |
db9f0278 | 1379 | val = Feval (Fcar (args)); |
177c0ea7 | 1380 | return unbind_to (count, val); |
db9f0278 JB |
1381 | } |
1382 | \f | |
1383 | /* Chain of condition handlers currently in effect. | |
1384 | The elements of this chain are contained in the stack frames | |
1385 | of Fcondition_case and internal_condition_case. | |
1386 | When an error is signaled (by calling Fsignal, below), | |
1387 | this chain is searched for an element that applies. */ | |
1388 | ||
1389 | struct handler *handlerlist; | |
1390 | ||
1391 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
9dbc9081 | 1392 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1393 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1394 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1395 | where the BODY is made of Lisp expressions. | |
1396 | ||
1397 | A handler is applicable to an error | |
1398 | if CONDITION-NAME is one of the error's condition names. | |
1399 | If an error happens, the first applicable handler is run. | |
1400 | ||
1401 | The car of a handler may be a list of condition names | |
c997bb25 | 1402 | instead of a single condition name. Then it handles all of them. |
9dbc9081 | 1403 | |
c997bb25 RS |
1404 | When a handler handles an error, control returns to the `condition-case' |
1405 | and it executes the handler's BODY... | |
d0acbbaf | 1406 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1407 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1408 | Then the value of the last BODY form is returned from the `condition-case' |
1409 | expression. | |
9dbc9081 | 1410 | |
9dbc9081 | 1411 | See also the function `signal' for more info. |
2b47b74d | 1412 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1413 | (Lisp_Object args) |
db9f0278 | 1414 | { |
17401c97 GM |
1415 | register Lisp_Object bodyform, handlers; |
1416 | volatile Lisp_Object var; | |
db9f0278 | 1417 | |
82da7701 JB |
1418 | var = Fcar (args); |
1419 | bodyform = Fcar (Fcdr (args)); | |
1420 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1421 | |
1422 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1423 | } | |
1424 | ||
1425 | /* Like Fcondition_case, but the args are separate | |
1426 | rather than passed in a list. Used by Fbyte_code. */ | |
1427 | ||
1428 | Lisp_Object | |
d3da34e0 JB |
1429 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1430 | Lisp_Object handlers) | |
ee830945 RS |
1431 | { |
1432 | Lisp_Object val; | |
1433 | struct catchtag c; | |
1434 | struct handler h; | |
1435 | ||
b7826503 | 1436 | CHECK_SYMBOL (var); |
82da7701 | 1437 | |
2b47b74d | 1438 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1439 | { |
1440 | Lisp_Object tem; | |
2b47b74d | 1441 | tem = XCAR (val); |
5f96776a RS |
1442 | if (! (NILP (tem) |
1443 | || (CONSP (tem) | |
03699b14 KR |
1444 | && (SYMBOLP (XCAR (tem)) |
1445 | || CONSP (XCAR (tem)))))) | |
82da7701 JB |
1446 | error ("Invalid condition handler", tem); |
1447 | } | |
db9f0278 JB |
1448 | |
1449 | c.tag = Qnil; | |
1450 | c.val = Qnil; | |
1451 | c.backlist = backtrace_list; | |
1452 | c.handlerlist = handlerlist; | |
1453 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1454 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1455 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1456 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1457 | c.gcpro = gcprolist; |
bcf28080 | 1458 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1459 | if (_setjmp (c.jmp)) |
1460 | { | |
265a9e55 | 1461 | if (!NILP (h.var)) |
bb8e180f | 1462 | specbind (h.var, c.val); |
9d58218c | 1463 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1464 | |
1465 | /* Note that this just undoes the binding of h.var; whoever | |
1466 | longjumped to us unwound the stack to c.pdlcount before | |
1467 | throwing. */ | |
db9f0278 JB |
1468 | unbind_to (c.pdlcount, Qnil); |
1469 | return val; | |
1470 | } | |
1471 | c.next = catchlist; | |
1472 | catchlist = &c; | |
177c0ea7 | 1473 | |
82da7701 JB |
1474 | h.var = var; |
1475 | h.handler = handlers; | |
db9f0278 | 1476 | h.next = handlerlist; |
db9f0278 JB |
1477 | h.tag = &c; |
1478 | handlerlist = &h; | |
1479 | ||
82da7701 | 1480 | val = Feval (bodyform); |
db9f0278 JB |
1481 | catchlist = c.next; |
1482 | handlerlist = h.next; | |
1483 | return val; | |
1484 | } | |
1485 | ||
f029ca5f RS |
1486 | /* Call the function BFUN with no arguments, catching errors within it |
1487 | according to HANDLERS. If there is an error, call HFUN with | |
1488 | one argument which is the data that describes the error: | |
1489 | (SIGNALNAME . DATA) | |
1490 | ||
1491 | HANDLERS can be a list of conditions to catch. | |
1492 | If HANDLERS is Qt, catch all errors. | |
1493 | If HANDLERS is Qerror, catch all errors | |
1494 | but allow the debugger to run if that is enabled. */ | |
1495 | ||
db9f0278 | 1496 | Lisp_Object |
d3da34e0 JB |
1497 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1498 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1499 | { |
1500 | Lisp_Object val; | |
1501 | struct catchtag c; | |
1502 | struct handler h; | |
1503 | ||
88019a63 RS |
1504 | /* Since Fsignal will close off all calls to x_catch_errors, |
1505 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1506 | #if HAVE_X_WINDOWS |
88019a63 | 1507 | if (x_catching_errors ()) |
01591d17 | 1508 | abort (); |
a2a103bb | 1509 | #endif |
01591d17 | 1510 | |
db9f0278 JB |
1511 | c.tag = Qnil; |
1512 | c.val = Qnil; | |
1513 | c.backlist = backtrace_list; | |
1514 | c.handlerlist = handlerlist; | |
1515 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1516 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1517 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1518 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1519 | c.gcpro = gcprolist; |
bcf28080 | 1520 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1521 | if (_setjmp (c.jmp)) |
1522 | { | |
9d58218c | 1523 | return (*hfun) (c.val); |
db9f0278 JB |
1524 | } |
1525 | c.next = catchlist; | |
1526 | catchlist = &c; | |
1527 | h.handler = handlers; | |
1528 | h.var = Qnil; | |
db9f0278 JB |
1529 | h.next = handlerlist; |
1530 | h.tag = &c; | |
1531 | handlerlist = &h; | |
1532 | ||
1533 | val = (*bfun) (); | |
1534 | catchlist = c.next; | |
1535 | handlerlist = h.next; | |
1536 | return val; | |
1537 | } | |
1538 | ||
2659a09f | 1539 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1540 | |
d227775c | 1541 | Lisp_Object |
d3da34e0 JB |
1542 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1543 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1544 | { |
1545 | Lisp_Object val; | |
1546 | struct catchtag c; | |
1547 | struct handler h; | |
1548 | ||
88019a63 RS |
1549 | /* Since Fsignal will close off all calls to x_catch_errors, |
1550 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1551 | #if HAVE_X_WINDOWS |
88019a63 RS |
1552 | if (x_catching_errors ()) |
1553 | abort (); | |
a2a103bb | 1554 | #endif |
88019a63 | 1555 | |
d227775c RS |
1556 | c.tag = Qnil; |
1557 | c.val = Qnil; | |
1558 | c.backlist = backtrace_list; | |
1559 | c.handlerlist = handlerlist; | |
1560 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1561 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1562 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1563 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1564 | c.gcpro = gcprolist; |
bcf28080 | 1565 | c.byte_stack = byte_stack_list; |
d227775c RS |
1566 | if (_setjmp (c.jmp)) |
1567 | { | |
9d58218c | 1568 | return (*hfun) (c.val); |
d227775c RS |
1569 | } |
1570 | c.next = catchlist; | |
1571 | catchlist = &c; | |
1572 | h.handler = handlers; | |
1573 | h.var = Qnil; | |
1574 | h.next = handlerlist; | |
1575 | h.tag = &c; | |
1576 | handlerlist = &h; | |
1577 | ||
1578 | val = (*bfun) (arg); | |
1579 | catchlist = c.next; | |
1580 | handlerlist = h.next; | |
1581 | return val; | |
1582 | } | |
10b29d41 | 1583 | |
53967e09 CY |
1584 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1585 | its arguments. */ | |
1586 | ||
1587 | Lisp_Object | |
178f2507 SM |
1588 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1589 | Lisp_Object arg1, | |
1590 | Lisp_Object arg2, | |
1591 | Lisp_Object handlers, | |
1592 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1593 | { |
1594 | Lisp_Object val; | |
1595 | struct catchtag c; | |
1596 | struct handler h; | |
1597 | ||
1598 | /* Since Fsignal will close off all calls to x_catch_errors, | |
1599 | we will get the wrong results if some are not closed now. */ | |
1600 | #if HAVE_X_WINDOWS | |
1601 | if (x_catching_errors ()) | |
1602 | abort (); | |
1603 | #endif | |
1604 | ||
1605 | c.tag = Qnil; | |
1606 | c.val = Qnil; | |
1607 | c.backlist = backtrace_list; | |
1608 | c.handlerlist = handlerlist; | |
1609 | c.lisp_eval_depth = lisp_eval_depth; | |
1610 | c.pdlcount = SPECPDL_INDEX (); | |
1611 | c.poll_suppress_count = poll_suppress_count; | |
1612 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1613 | c.gcpro = gcprolist; | |
1614 | c.byte_stack = byte_stack_list; | |
1615 | if (_setjmp (c.jmp)) | |
1616 | { | |
1617 | return (*hfun) (c.val); | |
1618 | } | |
1619 | c.next = catchlist; | |
1620 | catchlist = &c; | |
1621 | h.handler = handlers; | |
1622 | h.var = Qnil; | |
1623 | h.next = handlerlist; | |
1624 | h.tag = &c; | |
1625 | handlerlist = &h; | |
1626 | ||
1627 | val = (*bfun) (arg1, arg2); | |
1628 | catchlist = c.next; | |
1629 | handlerlist = h.next; | |
1630 | return val; | |
1631 | } | |
10b29d41 | 1632 | |
2659a09f | 1633 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1634 | and ARGS as second argument. */ |
1635 | ||
1636 | Lisp_Object | |
178f2507 SM |
1637 | internal_condition_case_n (Lisp_Object (*bfun) (int, Lisp_Object*), |
1638 | int nargs, | |
1639 | Lisp_Object *args, | |
1640 | Lisp_Object handlers, | |
1641 | Lisp_Object (*hfun) (Lisp_Object)) | |
10b29d41 GM |
1642 | { |
1643 | Lisp_Object val; | |
1644 | struct catchtag c; | |
1645 | struct handler h; | |
1646 | ||
88019a63 RS |
1647 | /* Since Fsignal will close off all calls to x_catch_errors, |
1648 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1649 | #if HAVE_X_WINDOWS |
88019a63 RS |
1650 | if (x_catching_errors ()) |
1651 | abort (); | |
a2a103bb | 1652 | #endif |
88019a63 | 1653 | |
10b29d41 GM |
1654 | c.tag = Qnil; |
1655 | c.val = Qnil; | |
1656 | c.backlist = backtrace_list; | |
1657 | c.handlerlist = handlerlist; | |
1658 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1659 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1660 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1661 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1662 | c.gcpro = gcprolist; |
1663 | c.byte_stack = byte_stack_list; | |
1664 | if (_setjmp (c.jmp)) | |
1665 | { | |
1666 | return (*hfun) (c.val); | |
1667 | } | |
1668 | c.next = catchlist; | |
1669 | catchlist = &c; | |
1670 | h.handler = handlers; | |
1671 | h.var = Qnil; | |
1672 | h.next = handlerlist; | |
1673 | h.tag = &c; | |
1674 | handlerlist = &h; | |
1675 | ||
1676 | val = (*bfun) (nargs, args); | |
1677 | catchlist = c.next; | |
1678 | handlerlist = h.next; | |
1679 | return val; | |
1680 | } | |
1681 | ||
d227775c | 1682 | \f |
f57e2426 | 1683 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object, |
bb8e180f | 1684 | Lisp_Object, Lisp_Object); |
db9f0278 JB |
1685 | |
1686 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
9dbc9081 PJ |
1687 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1688 | This function does not return. | |
1689 | ||
1690 | An error symbol is a symbol with an `error-conditions' property | |
1691 | that is a list of condition names. | |
1692 | A handler for any of those names will get to handle this signal. | |
1693 | The symbol `error' should normally be one of them. | |
1694 | ||
1695 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1696 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1697 | error message is constructed. | |
9dbc9081 PJ |
1698 | If the signal is handled, DATA is made available to the handler. |
1699 | See also the function `condition-case'. */) | |
5842a27b | 1700 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1701 | { |
bfa8ca43 | 1702 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1703 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1704 | That is a special case--don't do this in other situations. */ | |
db9f0278 JB |
1705 | register struct handler *allhandlers = handlerlist; |
1706 | Lisp_Object conditions; | |
c11d3d17 | 1707 | Lisp_Object string; |
1ea9dec4 | 1708 | Lisp_Object real_error_symbol; |
a2ff3819 | 1709 | struct backtrace *bp; |
db9f0278 | 1710 | |
346598f1 | 1711 | immediate_quit = handling_signal = 0; |
d063129f | 1712 | abort_on_gc = 0; |
db9f0278 JB |
1713 | if (gc_in_progress || waiting_for_input) |
1714 | abort (); | |
1715 | ||
1ea9dec4 RS |
1716 | if (NILP (error_symbol)) |
1717 | real_error_symbol = Fcar (data); | |
1718 | else | |
1719 | real_error_symbol = error_symbol; | |
1720 | ||
26631f2b RS |
1721 | #if 0 /* rms: I don't know why this was here, |
1722 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1723 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1724 | if (display_hourglass_p) |
1725 | cancel_hourglass (); | |
48f8dfa3 | 1726 | #endif |
177c0ea7 | 1727 | #endif |
48f8dfa3 | 1728 | |
61ede770 | 1729 | /* This hook is used by edebug. */ |
26631f2b RS |
1730 | if (! NILP (Vsignal_hook_function) |
1731 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1732 | { |
1733 | /* Edebug takes care of restoring these variables when it exits. */ | |
1734 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1735 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1736 | ||
1737 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1738 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1739 | ||
1740 | call2 (Vsignal_hook_function, error_symbol, data); | |
1741 | } | |
61ede770 | 1742 | |
1ea9dec4 | 1743 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1744 | |
a2ff3819 GM |
1745 | /* Remember from where signal was called. Skip over the frame for |
1746 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1747 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1748 | is a memory-full error. */ | |
090a072f | 1749 | Vsignaling_function = Qnil; |
26631f2b | 1750 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1751 | { |
1752 | bp = backtrace_list->next; | |
1753 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1754 | bp = bp->next; | |
1755 | if (bp && bp->function) | |
1756 | Vsignaling_function = *bp->function; | |
1757 | } | |
a2ff3819 | 1758 | |
db9f0278 JB |
1759 | for (; handlerlist; handlerlist = handlerlist->next) |
1760 | { | |
1761 | register Lisp_Object clause; | |
177c0ea7 | 1762 | |
db9f0278 | 1763 | clause = find_handler_clause (handlerlist->handler, conditions, |
f01cbfdd | 1764 | error_symbol, data); |
db9f0278 | 1765 | |
db9f0278 | 1766 | if (EQ (clause, Qlambda)) |
82da7701 | 1767 | { |
690337b7 KH |
1768 | /* We can't return values to code which signaled an error, but we |
1769 | can continue code which has signaled a quit. */ | |
1ea9dec4 | 1770 | if (EQ (real_error_symbol, Qquit)) |
82da7701 JB |
1771 | return Qnil; |
1772 | else | |
d3e6f8be | 1773 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1774 | } |
db9f0278 | 1775 | |
265a9e55 | 1776 | if (!NILP (clause)) |
db9f0278 | 1777 | { |
9d58218c | 1778 | Lisp_Object unwind_data; |
db9f0278 | 1779 | struct handler *h = handlerlist; |
9d58218c | 1780 | |
db9f0278 | 1781 | handlerlist = allhandlers; |
1ea9dec4 RS |
1782 | |
1783 | if (NILP (error_symbol)) | |
1784 | unwind_data = data; | |
9d58218c RS |
1785 | else |
1786 | unwind_data = Fcons (error_symbol, data); | |
1787 | h->chosen_clause = clause; | |
1788 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1789 | } |
1790 | } | |
1791 | ||
1792 | handlerlist = allhandlers; | |
1793 | /* If no handler is present now, try to run the debugger, | |
1794 | and if that fails, throw to top level. */ | |
f01cbfdd | 1795 | find_handler_clause (Qerror, conditions, error_symbol, data); |
c11d3d17 RS |
1796 | if (catchlist != 0) |
1797 | Fthrow (Qtop_level, Qt); | |
1798 | ||
1ea9dec4 | 1799 | if (! NILP (error_symbol)) |
c11d3d17 RS |
1800 | data = Fcons (error_symbol, data); |
1801 | ||
1802 | string = Ferror_message_string (data); | |
d5db4077 | 1803 | fatal ("%s", SDATA (string), 0); |
db9f0278 JB |
1804 | } |
1805 | ||
734d55a2 KS |
1806 | /* Internal version of Fsignal that never returns. |
1807 | Used for anything but Qquit (which can return from Fsignal). */ | |
1808 | ||
1809 | void | |
d3da34e0 | 1810 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1811 | { |
1812 | Fsignal (error_symbol, data); | |
1813 | abort (); | |
1814 | } | |
1815 | ||
1816 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1817 | ||
1818 | void | |
d3da34e0 | 1819 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1820 | { |
1821 | xsignal (error_symbol, Qnil); | |
1822 | } | |
1823 | ||
1824 | void | |
d3da34e0 | 1825 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1826 | { |
1827 | xsignal (error_symbol, list1 (arg)); | |
1828 | } | |
1829 | ||
1830 | void | |
d3da34e0 | 1831 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1832 | { |
1833 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1834 | } | |
1835 | ||
1836 | void | |
d3da34e0 | 1837 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1838 | { |
1839 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1840 | } | |
1841 | ||
1842 | /* Signal `error' with message S, and additional arg ARG. | |
1843 | If ARG is not a genuine list, make it a one-element list. */ | |
1844 | ||
1845 | void | |
a8fe7202 | 1846 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1847 | { |
1848 | Lisp_Object tortoise, hare; | |
1849 | ||
1850 | hare = tortoise = arg; | |
1851 | while (CONSP (hare)) | |
1852 | { | |
1853 | hare = XCDR (hare); | |
1854 | if (!CONSP (hare)) | |
1855 | break; | |
1856 | ||
1857 | hare = XCDR (hare); | |
1858 | tortoise = XCDR (tortoise); | |
1859 | ||
1860 | if (EQ (hare, tortoise)) | |
1861 | break; | |
1862 | } | |
1863 | ||
1864 | if (!NILP (hare)) | |
1865 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1866 | ||
1867 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1868 | } | |
1869 | ||
1870 | ||
e0f24100 | 1871 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1872 | a list containing one of CONDITIONS. */ |
1873 | ||
1874 | static int | |
d3da34e0 | 1875 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1876 | { |
4de86b16 | 1877 | if (NILP (list)) |
128c0f66 RM |
1878 | return 0; |
1879 | if (! CONSP (list)) | |
1880 | return 1; | |
1881 | ||
ab67260b | 1882 | while (CONSP (conditions)) |
128c0f66 | 1883 | { |
ab67260b | 1884 | Lisp_Object this, tail; |
03699b14 KR |
1885 | this = XCAR (conditions); |
1886 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1887 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1888 | return 1; |
03699b14 | 1889 | conditions = XCDR (conditions); |
128c0f66 | 1890 | } |
ab67260b | 1891 | return 0; |
128c0f66 RM |
1892 | } |
1893 | ||
fc950e09 KH |
1894 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1895 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1896 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1897 | |
1898 | static int | |
d3da34e0 | 1899 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1900 | { |
1901 | Lisp_Object tail; | |
1902 | int first_string = 1; | |
1903 | Lisp_Object error_message; | |
1904 | ||
17401c97 GM |
1905 | error_message = Qnil; |
1906 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1907 | { |
03699b14 | 1908 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1909 | { |
1910 | if (first_string) | |
1911 | { | |
1912 | error_message = Ferror_message_string (data); | |
1913 | first_string = 0; | |
1914 | } | |
177c0ea7 | 1915 | |
03699b14 | 1916 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1917 | return 1; |
1918 | } | |
1919 | else | |
1920 | { | |
1921 | Lisp_Object contail; | |
1922 | ||
17401c97 | 1923 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1924 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1925 | return 1; |
1926 | } | |
1927 | } | |
1928 | ||
1929 | return 0; | |
1930 | } | |
1931 | ||
ddaa36e1 AS |
1932 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
1933 | SIG and DATA describe the signal, as in find_handler_clause. */ | |
1934 | ||
1935 | static int | |
d3da34e0 | 1936 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1937 | { |
1938 | Lisp_Object combined_data; | |
1939 | ||
1940 | combined_data = Fcons (sig, data); | |
1941 | ||
1942 | if ( | |
1943 | /* Don't try to run the debugger with interrupts blocked. | |
1944 | The editing loop would return anyway. */ | |
1945 | ! INPUT_BLOCKED_P | |
1946 | /* Does user want to enter debugger for this kind of error? */ | |
1947 | && (EQ (sig, Qquit) | |
1948 | ? debug_on_quit | |
1949 | : wants_debugger (Vdebug_on_error, conditions)) | |
1950 | && ! skip_debugger (conditions, combined_data) | |
1951 | /* rms: what's this for? */ | |
1952 | && when_entered_debugger < num_nonmacro_input_events) | |
1953 | { | |
1954 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1955 | return 1; | |
1956 | } | |
1957 | ||
1958 | return 0; | |
1959 | } | |
1960 | ||
128c0f66 | 1961 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1962 | There are two ways to pass SIG and DATA: |
9b942ebd | 1963 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1964 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1965 | This is for memory-full errors only. |
1ea9dec4 | 1966 | |
9f5903bb RS |
1967 | We need to increase max_specpdl_size temporarily around |
1968 | anything we do that can push on the specpdl, so as not to get | |
1969 | a second error here in case we're handling specpdl overflow. */ | |
db9f0278 JB |
1970 | |
1971 | static Lisp_Object | |
d3da34e0 JB |
1972 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions, |
1973 | Lisp_Object sig, Lisp_Object data) | |
db9f0278 JB |
1974 | { |
1975 | register Lisp_Object h; | |
1976 | register Lisp_Object tem; | |
f01cbfdd RS |
1977 | int debugger_called = 0; |
1978 | int debugger_considered = 0; | |
db9f0278 | 1979 | |
f01cbfdd RS |
1980 | /* t is used by handlers for all conditions, set up by C code. */ |
1981 | if (EQ (handlers, Qt)) | |
db9f0278 | 1982 | return Qt; |
f01cbfdd RS |
1983 | |
1984 | /* Don't run the debugger for a memory-full error. | |
1985 | (There is no room in memory to do that!) */ | |
1986 | if (NILP (sig)) | |
1987 | debugger_considered = 1; | |
1988 | ||
61ede770 RS |
1989 | /* error is used similarly, but means print an error message |
1990 | and run the debugger if that is enabled. */ | |
1991 | if (EQ (handlers, Qerror) | |
57a6e758 RS |
1992 | || !NILP (Vdebug_on_signal)) /* This says call debugger even if |
1993 | there is a handler. */ | |
db9f0278 | 1994 | { |
f01cbfdd | 1995 | if (!NILP (sig) && wants_debugger (Vstack_trace_on_error, conditions)) |
88817f3b | 1996 | { |
48ce8ca7 | 1997 | max_lisp_eval_depth += 15; |
9f5903bb | 1998 | max_specpdl_size++; |
5b650faa SM |
1999 | if (noninteractive) |
2000 | Fbacktrace (); | |
2001 | else | |
2002 | internal_with_output_to_temp_buffer | |
2003 | ("*Backtrace*", | |
2004 | (Lisp_Object (*) (Lisp_Object)) Fbacktrace, | |
2005 | Qnil); | |
9f5903bb | 2006 | max_specpdl_size--; |
48ce8ca7 | 2007 | max_lisp_eval_depth -= 15; |
88817f3b | 2008 | } |
f01cbfdd RS |
2009 | |
2010 | if (!debugger_considered) | |
db9f0278 | 2011 | { |
f01cbfdd RS |
2012 | debugger_considered = 1; |
2013 | debugger_called = maybe_call_debugger (conditions, sig, data); | |
61ede770 | 2014 | } |
f01cbfdd | 2015 | |
61ede770 RS |
2016 | /* If there is no handler, return saying whether we ran the debugger. */ |
2017 | if (EQ (handlers, Qerror)) | |
2018 | { | |
2019 | if (debugger_called) | |
9f5903bb | 2020 | return Qlambda; |
61ede770 | 2021 | return Qt; |
db9f0278 | 2022 | } |
db9f0278 | 2023 | } |
f01cbfdd | 2024 | |
db9f0278 JB |
2025 | for (h = handlers; CONSP (h); h = Fcdr (h)) |
2026 | { | |
5f96776a RS |
2027 | Lisp_Object handler, condit; |
2028 | ||
2029 | handler = Fcar (h); | |
2030 | if (!CONSP (handler)) | |
db9f0278 | 2031 | continue; |
5f96776a RS |
2032 | condit = Fcar (handler); |
2033 | /* Handle a single condition name in handler HANDLER. */ | |
2034 | if (SYMBOLP (condit)) | |
2035 | { | |
2036 | tem = Fmemq (Fcar (handler), conditions); | |
2037 | if (!NILP (tem)) | |
2038 | return handler; | |
2039 | } | |
2040 | /* Handle a list of condition names in handler HANDLER. */ | |
2041 | else if (CONSP (condit)) | |
2042 | { | |
f01cbfdd RS |
2043 | Lisp_Object tail; |
2044 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 2045 | { |
f01cbfdd | 2046 | tem = Fmemq (Fcar (tail), conditions); |
5f96776a | 2047 | if (!NILP (tem)) |
f01cbfdd RS |
2048 | { |
2049 | /* This handler is going to apply. | |
2050 | Does it allow the debugger to run first? */ | |
2051 | if (! debugger_considered && !NILP (Fmemq (Qdebug, condit))) | |
2052 | maybe_call_debugger (conditions, sig, data); | |
2053 | return handler; | |
2054 | } | |
5f96776a RS |
2055 | } |
2056 | } | |
db9f0278 | 2057 | } |
f01cbfdd | 2058 | |
db9f0278 JB |
2059 | return Qnil; |
2060 | } | |
2061 | ||
db9f0278 | 2062 | |
b3ffc17c | 2063 | /* dump an error message; called like vprintf */ |
db9f0278 | 2064 | void |
b3ffc17c | 2065 | verror (const char *m, va_list ap) |
db9f0278 JB |
2066 | { |
2067 | char buf[200]; | |
5816888b | 2068 | EMACS_INT size = 200; |
9125da08 RS |
2069 | int mlen; |
2070 | char *buffer = buf; | |
2071 | char *args[3]; | |
2072 | int allocated = 0; | |
2073 | Lisp_Object string; | |
2074 | ||
9125da08 | 2075 | mlen = strlen (m); |
db9f0278 JB |
2076 | |
2077 | while (1) | |
9125da08 | 2078 | { |
db063399 | 2079 | EMACS_INT used; |
6a8033e1 | 2080 | used = doprnt (buffer, size, m, m + mlen, ap); |
9125da08 RS |
2081 | if (used < size) |
2082 | break; | |
2083 | size *= 2; | |
2084 | if (allocated) | |
2085 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
2086 | else |
2087 | { | |
2088 | buffer = (char *) xmalloc (size); | |
2089 | allocated = 1; | |
2090 | } | |
9125da08 RS |
2091 | } |
2092 | ||
955f3ff9 | 2093 | string = build_string (buffer); |
9125da08 | 2094 | if (allocated) |
9ae6734f | 2095 | xfree (buffer); |
9125da08 | 2096 | |
734d55a2 | 2097 | xsignal1 (Qerror, string); |
db9f0278 | 2098 | } |
b3ffc17c DN |
2099 | |
2100 | ||
2101 | /* dump an error message; called like printf */ | |
2102 | ||
2103 | /* VARARGS 1 */ | |
2104 | void | |
2105 | error (const char *m, ...) | |
2106 | { | |
2107 | va_list ap; | |
2108 | va_start (ap, m); | |
2109 | verror (m, ap); | |
2110 | va_end (ap); | |
2111 | } | |
db9f0278 | 2112 | \f |
e72706be | 2113 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
2114 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
2115 | This means it contains a description for how to read arguments to give it. | |
2116 | The value is nil for an invalid function or a symbol with no function | |
2117 | definition. | |
2118 | ||
2119 | Interactively callable functions include strings and vectors (treated | |
2120 | as keyboard macros), lambda-expressions that contain a top-level call | |
2121 | to `interactive', autoload definitions made by `autoload' with non-nil | |
2122 | fourth argument, and some of the built-in functions of Lisp. | |
2123 | ||
e72706be RS |
2124 | Also, a symbol satisfies `commandp' if its function definition does so. |
2125 | ||
2126 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2127 | then strings and vectors are not accepted. */) |
5842a27b | 2128 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
2129 | { |
2130 | register Lisp_Object fun; | |
2131 | register Lisp_Object funcar; | |
52b71f49 | 2132 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2133 | |
2134 | fun = function; | |
2135 | ||
52b71f49 SM |
2136 | fun = indirect_function (fun); /* Check cycles. */ |
2137 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2138 | return Qnil; |
db9f0278 | 2139 | |
52b71f49 SM |
2140 | /* Check an `interactive-form' property if present, analogous to the |
2141 | function-documentation property. */ | |
2142 | fun = function; | |
2143 | while (SYMBOLP (fun)) | |
2144 | { | |
2b9aa051 | 2145 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
2146 | if (!NILP (tmp)) |
2147 | if_prop = Qt; | |
2148 | fun = Fsymbol_function (fun); | |
2149 | } | |
2150 | ||
db9f0278 JB |
2151 | /* Emacs primitives are interactive if their DEFUN specifies an |
2152 | interactive spec. */ | |
90165123 | 2153 | if (SUBRP (fun)) |
04724b69 | 2154 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2155 | |
2156 | /* Bytecode objects are interactive if they are long enough to | |
2157 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2158 | where the interactive spec is stored. */ | |
90165123 | 2159 | else if (COMPILEDP (fun)) |
845975f5 | 2160 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2161 | ? Qt : if_prop); |
db9f0278 JB |
2162 | |
2163 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2164 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2165 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2166 | |
2167 | /* Lists may represent commands. */ | |
2168 | if (!CONSP (fun)) | |
2169 | return Qnil; | |
ed16fb98 | 2170 | funcar = XCAR (fun); |
db9f0278 | 2171 | if (EQ (funcar, Qlambda)) |
52b71f49 | 2172 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
db9f0278 | 2173 | if (EQ (funcar, Qautoload)) |
52b71f49 | 2174 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2175 | else |
2176 | return Qnil; | |
2177 | } | |
2178 | ||
db9f0278 | 2179 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
2180 | doc: /* Define FUNCTION to autoload from FILE. |
2181 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2182 | Third arg DOCSTRING is documentation for the function. | |
2183 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2184 | Fifth arg TYPE indicates the type of the object: | |
2185 | nil or omitted says FUNCTION is a function, | |
2186 | `keymap' says FUNCTION is really a keymap, and | |
2187 | `macro' or t says FUNCTION is really a macro. | |
2188 | Third through fifth args give info about the real definition. | |
2189 | They default to nil. | |
2190 | If FUNCTION is already defined other than as an autoload, | |
2191 | this does nothing and returns nil. */) | |
5842a27b | 2192 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 2193 | { |
b7826503 PJ |
2194 | CHECK_SYMBOL (function); |
2195 | CHECK_STRING (file); | |
db9f0278 JB |
2196 | |
2197 | /* If function is defined and not as an autoload, don't override */ | |
2198 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 2199 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2200 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2201 | return Qnil; |
2202 | ||
7973e637 SM |
2203 | if (NILP (Vpurify_flag)) |
2204 | /* Only add entries after dumping, because the ones before are | |
2205 | not useful and else we get loads of them from the loaddefs.el. */ | |
2206 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
905a9ed3 | 2207 | else |
a56eaaef | 2208 | /* We don't want the docstring in purespace (instead, |
d6d23852 SM |
2209 | Snarf-documentation should (hopefully) overwrite it). |
2210 | We used to use 0 here, but that leads to accidental sharing in | |
2211 | purecopy's hash-consing, so we use a (hopefully) unique integer | |
2212 | instead. */ | |
2213 | docstring = make_number (XHASH (function)); | |
a56eaaef DN |
2214 | return Ffset (function, |
2215 | Fpurecopy (list5 (Qautoload, file, docstring, | |
2216 | interactive, type))); | |
db9f0278 JB |
2217 | } |
2218 | ||
2219 | Lisp_Object | |
d3da34e0 | 2220 | un_autoload (Lisp_Object oldqueue) |
db9f0278 JB |
2221 | { |
2222 | register Lisp_Object queue, first, second; | |
2223 | ||
2224 | /* Queue to unwind is current value of Vautoload_queue. | |
2225 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2226 | queue = Vautoload_queue; | |
2227 | Vautoload_queue = oldqueue; | |
2228 | while (CONSP (queue)) | |
2229 | { | |
e509f168 | 2230 | first = XCAR (queue); |
db9f0278 JB |
2231 | second = Fcdr (first); |
2232 | first = Fcar (first); | |
47b82df9 RS |
2233 | if (EQ (first, make_number (0))) |
2234 | Vfeatures = second; | |
db9f0278 JB |
2235 | else |
2236 | Ffset (first, second); | |
e509f168 | 2237 | queue = XCDR (queue); |
db9f0278 JB |
2238 | } |
2239 | return Qnil; | |
2240 | } | |
2241 | ||
ca20916b RS |
2242 | /* Load an autoloaded function. |
2243 | FUNNAME is the symbol which is the function's name. | |
2244 | FUNDEF is the autoload definition (a list). */ | |
2245 | ||
045ba794 | 2246 | void |
d3da34e0 | 2247 | do_autoload (Lisp_Object fundef, Lisp_Object funname) |
db9f0278 | 2248 | { |
aed13378 | 2249 | int count = SPECPDL_INDEX (); |
d945992e | 2250 | Lisp_Object fun; |
ca20916b | 2251 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2252 | |
aea6173f RS |
2253 | /* This is to make sure that loadup.el gives a clear picture |
2254 | of what files are preloaded and when. */ | |
ab4db096 RS |
2255 | if (! NILP (Vpurify_flag)) |
2256 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2257 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2258 | |
db9f0278 | 2259 | fun = funname; |
b7826503 | 2260 | CHECK_SYMBOL (funname); |
ca20916b | 2261 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2262 | |
f87740dc | 2263 | /* Preserve the match data. */ |
89f2614d | 2264 | record_unwind_save_match_data (); |
177c0ea7 | 2265 | |
a04ee161 RS |
2266 | /* If autoloading gets an error (which includes the error of failing |
2267 | to define the function being called), we use Vautoload_queue | |
2268 | to undo function definitions and `provide' calls made by | |
2269 | the function. We do this in the specific case of autoloading | |
2270 | because autoloading is not an explicit request "load this file", | |
2271 | but rather a request to "call this function". | |
d3da34e0 | 2272 | |
a04ee161 | 2273 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
2274 | record_unwind_protect (un_autoload, Vautoload_queue); |
2275 | Vautoload_queue = Qt; | |
7351b242 | 2276 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2277 | |
db9f0278 JB |
2278 | /* Once loading finishes, don't undo it. */ |
2279 | Vautoload_queue = Qt; | |
2280 | unbind_to (count, Qnil); | |
2281 | ||
a7f96a35 | 2282 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2283 | |
76c2b0cc | 2284 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2285 | error ("Autoloading failed to define function %s", |
d5db4077 | 2286 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2287 | UNGCPRO; |
db9f0278 | 2288 | } |
4c576a83 | 2289 | |
db9f0278 JB |
2290 | \f |
2291 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
9dbc9081 | 2292 | doc: /* Evaluate FORM and return its value. */) |
5842a27b | 2293 | (Lisp_Object form) |
db9f0278 JB |
2294 | { |
2295 | Lisp_Object fun, val, original_fun, original_args; | |
2296 | Lisp_Object funcar; | |
2297 | struct backtrace backtrace; | |
2298 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2299 | ||
df470e3b | 2300 | if (handling_signal) |
48f8dfa3 | 2301 | abort (); |
177c0ea7 | 2302 | |
90165123 | 2303 | if (SYMBOLP (form)) |
b9598260 SM |
2304 | { |
2305 | /* If there's an active lexical environment, and the variable | |
2306 | isn't declared special, look up its binding in the lexical | |
2307 | environment. */ | |
2308 | if (!NILP (Vinternal_interpreter_environment) | |
2309 | && !XSYMBOL (form)->declared_special) | |
2310 | { | |
2311 | Lisp_Object lex_binding | |
2312 | = Fassq (form, Vinternal_interpreter_environment); | |
2313 | ||
2314 | /* If we found a lexical binding for FORM, return the value. | |
2315 | Otherwise, we just drop through and look for a dynamic | |
2316 | binding -- the variable isn't declared special, but there's | |
2317 | not much else we can do, and Fsymbol_value will take care | |
2318 | of signaling an error if there is no binding at all. */ | |
2319 | if (CONSP (lex_binding)) | |
2320 | return XCDR (lex_binding); | |
2321 | } | |
2322 | ||
2323 | return Fsymbol_value (form); | |
2324 | } | |
2325 | ||
db9f0278 JB |
2326 | if (!CONSP (form)) |
2327 | return form; | |
2328 | ||
2329 | QUIT; | |
ee830945 RS |
2330 | if ((consing_since_gc > gc_cons_threshold |
2331 | && consing_since_gc > gc_relative_threshold) | |
2332 | || | |
2333 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2334 | { |
2335 | GCPRO1 (form); | |
2336 | Fgarbage_collect (); | |
2337 | UNGCPRO; | |
2338 | } | |
2339 | ||
2340 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2341 | { | |
2342 | if (max_lisp_eval_depth < 100) | |
2343 | max_lisp_eval_depth = 100; | |
2344 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2345 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2346 | } |
2347 | ||
2348 | original_fun = Fcar (form); | |
2349 | original_args = Fcdr (form); | |
2350 | ||
2351 | backtrace.next = backtrace_list; | |
2352 | backtrace_list = &backtrace; | |
2353 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
2354 | backtrace.args = &original_args; | |
2355 | backtrace.nargs = UNEVALLED; | |
2356 | backtrace.evalargs = 1; | |
2357 | backtrace.debug_on_exit = 0; | |
2358 | ||
2359 | if (debug_on_next_call) | |
2360 | do_debug_on_call (Qt); | |
2361 | ||
2362 | /* At this point, only original_fun and original_args | |
2363 | have values that will be used below */ | |
2364 | retry: | |
8788120f KS |
2365 | |
2366 | /* Optimize for no indirection. */ | |
2367 | fun = original_fun; | |
2368 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2369 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2370 | fun = indirect_function (fun); | |
db9f0278 | 2371 | |
90165123 | 2372 | if (SUBRP (fun)) |
db9f0278 JB |
2373 | { |
2374 | Lisp_Object numargs; | |
166c822d | 2375 | Lisp_Object argvals[8]; |
db9f0278 JB |
2376 | Lisp_Object args_left; |
2377 | register int i, maxargs; | |
2378 | ||
2379 | args_left = original_args; | |
2380 | numargs = Flength (args_left); | |
2381 | ||
c1788fbc RS |
2382 | CHECK_CONS_LIST (); |
2383 | ||
db9f0278 JB |
2384 | if (XINT (numargs) < XSUBR (fun)->min_args || |
2385 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2386 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 JB |
2387 | |
2388 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2389 | { | |
2390 | backtrace.evalargs = 0; | |
d5273788 | 2391 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
db9f0278 JB |
2392 | goto done; |
2393 | } | |
2394 | ||
2395 | if (XSUBR (fun)->max_args == MANY) | |
2396 | { | |
2397 | /* Pass a vector of evaluated arguments */ | |
2398 | Lisp_Object *vals; | |
2399 | register int argnum = 0; | |
3a7a9129 | 2400 | USE_SAFE_ALLOCA; |
db9f0278 | 2401 | |
b72e0717 | 2402 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2403 | |
2404 | GCPRO3 (args_left, fun, fun); | |
2405 | gcpro3.var = vals; | |
2406 | gcpro3.nvars = 0; | |
2407 | ||
265a9e55 | 2408 | while (!NILP (args_left)) |
db9f0278 JB |
2409 | { |
2410 | vals[argnum++] = Feval (Fcar (args_left)); | |
2411 | args_left = Fcdr (args_left); | |
2412 | gcpro3.nvars = argnum; | |
2413 | } | |
db9f0278 JB |
2414 | |
2415 | backtrace.args = vals; | |
2416 | backtrace.nargs = XINT (numargs); | |
2417 | ||
d5273788 | 2418 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2419 | UNGCPRO; |
3a7a9129 | 2420 | SAFE_FREE (); |
db9f0278 JB |
2421 | goto done; |
2422 | } | |
2423 | ||
2424 | GCPRO3 (args_left, fun, fun); | |
2425 | gcpro3.var = argvals; | |
2426 | gcpro3.nvars = 0; | |
2427 | ||
2428 | maxargs = XSUBR (fun)->max_args; | |
2429 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2430 | { | |
2431 | argvals[i] = Feval (Fcar (args_left)); | |
2432 | gcpro3.nvars = ++i; | |
2433 | } | |
2434 | ||
2435 | UNGCPRO; | |
2436 | ||
2437 | backtrace.args = argvals; | |
2438 | backtrace.nargs = XINT (numargs); | |
2439 | ||
2440 | switch (i) | |
2441 | { | |
2442 | case 0: | |
c0f2f16b | 2443 | val = (XSUBR (fun)->function.a0) (); |
db9f0278 JB |
2444 | goto done; |
2445 | case 1: | |
c0f2f16b | 2446 | val = (XSUBR (fun)->function.a1) (argvals[0]); |
db9f0278 JB |
2447 | goto done; |
2448 | case 2: | |
c0f2f16b | 2449 | val = (XSUBR (fun)->function.a2) (argvals[0], argvals[1]); |
db9f0278 JB |
2450 | goto done; |
2451 | case 3: | |
c0f2f16b DN |
2452 | val = (XSUBR (fun)->function.a3) (argvals[0], argvals[1], |
2453 | argvals[2]); | |
db9f0278 JB |
2454 | goto done; |
2455 | case 4: | |
c0f2f16b DN |
2456 | val = (XSUBR (fun)->function.a4) (argvals[0], argvals[1], |
2457 | argvals[2], argvals[3]); | |
db9f0278 JB |
2458 | goto done; |
2459 | case 5: | |
c0f2f16b DN |
2460 | val = (XSUBR (fun)->function.a5) (argvals[0], argvals[1], argvals[2], |
2461 | argvals[3], argvals[4]); | |
db9f0278 JB |
2462 | goto done; |
2463 | case 6: | |
c0f2f16b DN |
2464 | val = (XSUBR (fun)->function.a6) (argvals[0], argvals[1], argvals[2], |
2465 | argvals[3], argvals[4], argvals[5]); | |
db9f0278 | 2466 | goto done; |
15c65264 | 2467 | case 7: |
c0f2f16b DN |
2468 | val = (XSUBR (fun)->function.a7) (argvals[0], argvals[1], argvals[2], |
2469 | argvals[3], argvals[4], argvals[5], | |
2470 | argvals[6]); | |
15c65264 | 2471 | goto done; |
db9f0278 | 2472 | |
166c822d | 2473 | case 8: |
c0f2f16b DN |
2474 | val = (XSUBR (fun)->function.a8) (argvals[0], argvals[1], argvals[2], |
2475 | argvals[3], argvals[4], argvals[5], | |
2476 | argvals[6], argvals[7]); | |
166c822d KH |
2477 | goto done; |
2478 | ||
db9f0278 | 2479 | default: |
08564963 JB |
2480 | /* Someone has created a subr that takes more arguments than |
2481 | is supported by this code. We need to either rewrite the | |
2482 | subr to use a different argument protocol, or add more | |
2483 | cases to this switch. */ | |
2484 | abort (); | |
db9f0278 JB |
2485 | } |
2486 | } | |
b9598260 SM |
2487 | if (FUNVECP (fun)) |
2488 | val = apply_lambda (fun, original_args, 1, Qnil); | |
db9f0278 JB |
2489 | else |
2490 | { | |
8788120f | 2491 | if (EQ (fun, Qunbound)) |
734d55a2 | 2492 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2493 | if (!CONSP (fun)) |
734d55a2 KS |
2494 | xsignal1 (Qinvalid_function, original_fun); |
2495 | funcar = XCAR (fun); | |
90165123 | 2496 | if (!SYMBOLP (funcar)) |
734d55a2 | 2497 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2498 | if (EQ (funcar, Qautoload)) |
2499 | { | |
2500 | do_autoload (fun, original_fun); | |
2501 | goto retry; | |
2502 | } | |
2503 | if (EQ (funcar, Qmacro)) | |
2504 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
2505 | else if (EQ (funcar, Qlambda)) | |
b9598260 SM |
2506 | val = apply_lambda (fun, original_args, 1, |
2507 | /* Only pass down the current lexical environment | |
2508 | if FUN is lexically embedded in FORM. */ | |
2509 | (CONSP (original_fun) | |
2510 | ? Vinternal_interpreter_environment | |
2511 | : Qnil)); | |
2512 | else if (EQ (funcar, Qclosure) | |
2513 | && CONSP (XCDR (fun)) | |
2514 | && CONSP (XCDR (XCDR (fun))) | |
2515 | && EQ (XCAR (XCDR (XCDR (fun))), Qlambda)) | |
2516 | val = apply_lambda (XCDR (XCDR (fun)), original_args, 1, | |
2517 | XCAR (XCDR (fun))); | |
db9f0278 | 2518 | else |
734d55a2 | 2519 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2520 | } |
2521 | done: | |
c1788fbc RS |
2522 | CHECK_CONS_LIST (); |
2523 | ||
db9f0278 JB |
2524 | lisp_eval_depth--; |
2525 | if (backtrace.debug_on_exit) | |
2526 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2527 | backtrace_list = backtrace.next; | |
824eb35e | 2528 | |
db9f0278 JB |
2529 | return val; |
2530 | } | |
2531 | \f | |
2532 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
9dbc9081 PJ |
2533 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2534 | Then return the value FUNCTION returns. | |
2535 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2536 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
5842a27b | 2537 | (int nargs, Lisp_Object *args) |
db9f0278 JB |
2538 | { |
2539 | register int i, numargs; | |
2540 | register Lisp_Object spread_arg; | |
2541 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2542 | Lisp_Object fun, retval; |
96d44c64 | 2543 | struct gcpro gcpro1; |
3a7a9129 | 2544 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2545 | |
2546 | fun = args [0]; | |
2547 | funcall_args = 0; | |
2548 | spread_arg = args [nargs - 1]; | |
b7826503 | 2549 | CHECK_LIST (spread_arg); |
177c0ea7 | 2550 | |
db9f0278 JB |
2551 | numargs = XINT (Flength (spread_arg)); |
2552 | ||
2553 | if (numargs == 0) | |
2554 | return Ffuncall (nargs - 1, args); | |
2555 | else if (numargs == 1) | |
2556 | { | |
03699b14 | 2557 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2558 | return Ffuncall (nargs, args); |
2559 | } | |
2560 | ||
a6e3fa71 | 2561 | numargs += nargs - 2; |
db9f0278 | 2562 | |
8788120f KS |
2563 | /* Optimize for no indirection. */ |
2564 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2565 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2566 | fun = indirect_function (fun); | |
ffd56f97 | 2567 | if (EQ (fun, Qunbound)) |
db9f0278 | 2568 | { |
ffd56f97 JB |
2569 | /* Let funcall get the error */ |
2570 | fun = args[0]; | |
2571 | goto funcall; | |
db9f0278 JB |
2572 | } |
2573 | ||
90165123 | 2574 | if (SUBRP (fun)) |
db9f0278 JB |
2575 | { |
2576 | if (numargs < XSUBR (fun)->min_args | |
2577 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2578 | goto funcall; /* Let funcall get the error */ | |
2579 | else if (XSUBR (fun)->max_args > numargs) | |
2580 | { | |
2581 | /* Avoid making funcall cons up a yet another new vector of arguments | |
2582 | by explicitly supplying nil's for optional values */ | |
b72e0717 | 2583 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2584 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2585 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2586 | GCPRO1 (*funcall_args); |
2587 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2588 | } |
2589 | } | |
2590 | funcall: | |
2591 | /* We add 1 to numargs because funcall_args includes the | |
2592 | function itself as well as its arguments. */ | |
2593 | if (!funcall_args) | |
a6e3fa71 | 2594 | { |
b72e0717 | 2595 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2596 | GCPRO1 (*funcall_args); |
2597 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2598 | } |
2599 | ||
72af86bd | 2600 | memcpy (funcall_args, args, nargs * sizeof (Lisp_Object)); |
db9f0278 JB |
2601 | /* Spread the last arg we got. Its first element goes in |
2602 | the slot that it used to occupy, hence this value of I. */ | |
2603 | i = nargs - 1; | |
265a9e55 | 2604 | while (!NILP (spread_arg)) |
db9f0278 | 2605 | { |
03699b14 KR |
2606 | funcall_args [i++] = XCAR (spread_arg); |
2607 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2608 | } |
a6e3fa71 | 2609 | |
96d44c64 | 2610 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2611 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2612 | UNGCPRO; | |
2613 | SAFE_FREE (); | |
2614 | ||
2615 | return retval; | |
db9f0278 JB |
2616 | } |
2617 | \f | |
ff936e53 SM |
2618 | /* Run hook variables in various ways. */ |
2619 | ||
2620 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
f57e2426 | 2621 | static Lisp_Object run_hook_with_args (int, Lisp_Object *, |
bb8e180f | 2622 | enum run_hooks_condition); |
ff936e53 | 2623 | |
8b5176cd | 2624 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2625 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2626 | Each argument should be a symbol, a hook variable. |
2627 | These symbols are processed in the order specified. | |
2628 | If a hook symbol has a non-nil value, that value may be a function | |
2629 | or a list of functions to be called to run the hook. | |
2630 | If the value is a function, it is called with no arguments. | |
2631 | If it is a list, the elements are called, in order, with no arguments. | |
2632 | ||
9f685258 LK |
2633 | Major modes should not use this function directly to run their mode |
2634 | hook; they should use `run-mode-hooks' instead. | |
2635 | ||
72e85d5d RS |
2636 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2637 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2638 | usage: (run-hooks &rest HOOKS) */) |
5842a27b | 2639 | (int nargs, Lisp_Object *args) |
ff936e53 SM |
2640 | { |
2641 | Lisp_Object hook[1]; | |
2642 | register int i; | |
2643 | ||
2644 | for (i = 0; i < nargs; i++) | |
2645 | { | |
2646 | hook[0] = args[i]; | |
2647 | run_hook_with_args (1, hook, to_completion); | |
2648 | } | |
2649 | ||
2650 | return Qnil; | |
2651 | } | |
177c0ea7 | 2652 | |
a0d76c27 | 2653 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2654 | Srun_hook_with_args, 1, MANY, 0, |
2655 | doc: /* Run HOOK with the specified arguments ARGS. | |
2656 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2657 | value, that value may be a function or a list of functions to be | |
2658 | called to run the hook. If the value is a function, it is called with | |
2659 | the given arguments and its return value is returned. If it is a list | |
2660 | of functions, those functions are called, in order, | |
2661 | with the given arguments ARGS. | |
d5e2c90c | 2662 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2663 | as that may change. |
2664 | ||
72e85d5d RS |
2665 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2666 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2667 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
5842a27b | 2668 | (int nargs, Lisp_Object *args) |
ff936e53 SM |
2669 | { |
2670 | return run_hook_with_args (nargs, args, to_completion); | |
2671 | } | |
2672 | ||
a0d76c27 | 2673 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2674 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2675 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2676 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2677 | value, that value may be a function or a list of functions to be | |
2678 | called to run the hook. If the value is a function, it is called with | |
2679 | the given arguments and its return value is returned. | |
2680 | If it is a list of functions, those functions are called, in order, | |
2681 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2682 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2683 | However, if they all return nil, we return nil. |
9dbc9081 | 2684 | |
72e85d5d RS |
2685 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2686 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2687 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
5842a27b | 2688 | (int nargs, Lisp_Object *args) |
b0b667cb | 2689 | { |
ff936e53 SM |
2690 | return run_hook_with_args (nargs, args, until_success); |
2691 | } | |
2692 | ||
a0d76c27 | 2693 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2694 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2695 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2696 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2697 | value, that value may be a function or a list of functions to be | |
2698 | called to run the hook. If the value is a function, it is called with | |
2699 | the given arguments and its return value is returned. | |
2700 | If it is a list of functions, those functions are called, in order, | |
2701 | with the given arguments ARGS, until one of them returns nil. | |
2702 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2703 | |
72e85d5d RS |
2704 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2705 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2706 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
5842a27b | 2707 | (int nargs, Lisp_Object *args) |
ff936e53 SM |
2708 | { |
2709 | return run_hook_with_args (nargs, args, until_failure); | |
2710 | } | |
2711 | ||
c933ea05 RS |
2712 | /* ARGS[0] should be a hook symbol. |
2713 | Call each of the functions in the hook value, passing each of them | |
2714 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2715 | COND specifies a condition to test after each call | |
2716 | to decide whether to stop. | |
2717 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2718 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2719 | ||
2901f1d1 | 2720 | static Lisp_Object |
d3da34e0 | 2721 | run_hook_with_args (int nargs, Lisp_Object *args, enum run_hooks_condition cond) |
ff936e53 SM |
2722 | { |
2723 | Lisp_Object sym, val, ret; | |
fada05d6 | 2724 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2725 | |
f029ca5f RS |
2726 | /* If we are dying or still initializing, |
2727 | don't do anything--it would probably crash if we tried. */ | |
2728 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2729 | return Qnil; |
f029ca5f | 2730 | |
b0b667cb | 2731 | sym = args[0]; |
aa681b51 | 2732 | val = find_symbol_value (sym); |
ff936e53 SM |
2733 | ret = (cond == until_failure ? Qt : Qnil); |
2734 | ||
b0b667cb | 2735 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2736 | return ret; |
03699b14 | 2737 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2738 | { |
2739 | args[0] = val; | |
2740 | return Ffuncall (nargs, args); | |
2741 | } | |
2742 | else | |
2743 | { | |
8932b1c2 | 2744 | Lisp_Object globals = Qnil; |
fada05d6 | 2745 | GCPRO3 (sym, val, globals); |
cb9d21f8 | 2746 | |
ff936e53 SM |
2747 | for (; |
2748 | CONSP (val) && ((cond == to_completion) | |
2749 | || (cond == until_success ? NILP (ret) | |
2750 | : !NILP (ret))); | |
03699b14 | 2751 | val = XCDR (val)) |
b0b667cb | 2752 | { |
03699b14 | 2753 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2754 | { |
2755 | /* t indicates this hook has a local binding; | |
2756 | it means to run the global binding too. */ | |
8932b1c2 CY |
2757 | globals = Fdefault_value (sym); |
2758 | if (NILP (globals)) continue; | |
b0b667cb | 2759 | |
8932b1c2 | 2760 | if (!CONSP (globals) || EQ (XCAR (globals), Qlambda)) |
b0b667cb | 2761 | { |
8932b1c2 CY |
2762 | args[0] = globals; |
2763 | ret = Ffuncall (nargs, args); | |
2764 | } | |
2765 | else | |
2766 | { | |
2767 | for (; | |
2768 | CONSP (globals) && ((cond == to_completion) | |
2769 | || (cond == until_success ? NILP (ret) | |
2770 | : !NILP (ret))); | |
2771 | globals = XCDR (globals)) | |
2772 | { | |
2773 | args[0] = XCAR (globals); | |
2774 | /* In a global value, t should not occur. If it does, we | |
2775 | must ignore it to avoid an endless loop. */ | |
2776 | if (!EQ (args[0], Qt)) | |
2777 | ret = Ffuncall (nargs, args); | |
2778 | } | |
b0b667cb KH |
2779 | } |
2780 | } | |
2781 | else | |
2782 | { | |
03699b14 | 2783 | args[0] = XCAR (val); |
ff936e53 | 2784 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2785 | } |
2786 | } | |
cb9d21f8 RS |
2787 | |
2788 | UNGCPRO; | |
ff936e53 | 2789 | return ret; |
b0b667cb KH |
2790 | } |
2791 | } | |
c933ea05 RS |
2792 | |
2793 | /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual | |
2794 | present value of that symbol. | |
2795 | Call each element of FUNLIST, | |
2796 | passing each of them the rest of ARGS. | |
2797 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2798 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2799 | ||
2800 | Lisp_Object | |
d3da34e0 | 2801 | run_hook_list_with_args (Lisp_Object funlist, int nargs, Lisp_Object *args) |
c933ea05 RS |
2802 | { |
2803 | Lisp_Object sym; | |
2804 | Lisp_Object val; | |
fada05d6 KH |
2805 | Lisp_Object globals; |
2806 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c933ea05 RS |
2807 | |
2808 | sym = args[0]; | |
fada05d6 KH |
2809 | globals = Qnil; |
2810 | GCPRO3 (sym, val, globals); | |
c933ea05 | 2811 | |
03699b14 | 2812 | for (val = funlist; CONSP (val); val = XCDR (val)) |
c933ea05 | 2813 | { |
03699b14 | 2814 | if (EQ (XCAR (val), Qt)) |
c933ea05 RS |
2815 | { |
2816 | /* t indicates this hook has a local binding; | |
2817 | it means to run the global binding too. */ | |
c933ea05 RS |
2818 | |
2819 | for (globals = Fdefault_value (sym); | |
2820 | CONSP (globals); | |
03699b14 | 2821 | globals = XCDR (globals)) |
c933ea05 | 2822 | { |
03699b14 | 2823 | args[0] = XCAR (globals); |
77d92e05 RS |
2824 | /* In a global value, t should not occur. If it does, we |
2825 | must ignore it to avoid an endless loop. */ | |
2826 | if (!EQ (args[0], Qt)) | |
2827 | Ffuncall (nargs, args); | |
c933ea05 RS |
2828 | } |
2829 | } | |
2830 | else | |
2831 | { | |
03699b14 | 2832 | args[0] = XCAR (val); |
c933ea05 RS |
2833 | Ffuncall (nargs, args); |
2834 | } | |
2835 | } | |
2836 | UNGCPRO; | |
2837 | return Qnil; | |
2838 | } | |
7d48558f RS |
2839 | |
2840 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ | |
2841 | ||
2842 | void | |
d3da34e0 | 2843 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2844 | { |
2845 | Lisp_Object temp[3]; | |
2846 | temp[0] = hook; | |
2847 | temp[1] = arg1; | |
2848 | temp[2] = arg2; | |
2849 | ||
2850 | Frun_hook_with_args (3, temp); | |
2851 | } | |
ff936e53 | 2852 | \f |
db9f0278 JB |
2853 | /* Apply fn to arg */ |
2854 | Lisp_Object | |
d3da34e0 | 2855 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2856 | { |
a6e3fa71 JB |
2857 | struct gcpro gcpro1; |
2858 | ||
2859 | GCPRO1 (fn); | |
265a9e55 | 2860 | if (NILP (arg)) |
a6e3fa71 JB |
2861 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2862 | gcpro1.nvars = 2; | |
db9f0278 JB |
2863 | { |
2864 | Lisp_Object args[2]; | |
2865 | args[0] = fn; | |
2866 | args[1] = arg; | |
a6e3fa71 JB |
2867 | gcpro1.var = args; |
2868 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2869 | } |
db9f0278 JB |
2870 | } |
2871 | ||
2872 | /* Call function fn on no arguments */ | |
2873 | Lisp_Object | |
d3da34e0 | 2874 | call0 (Lisp_Object fn) |
db9f0278 | 2875 | { |
a6e3fa71 JB |
2876 | struct gcpro gcpro1; |
2877 | ||
2878 | GCPRO1 (fn); | |
2879 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2880 | } |
2881 | ||
15285f9f | 2882 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2883 | /* ARGSUSED */ |
2884 | Lisp_Object | |
d3da34e0 | 2885 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2886 | { |
a6e3fa71 | 2887 | struct gcpro gcpro1; |
177c0ea7 | 2888 | Lisp_Object args[2]; |
a6e3fa71 | 2889 | |
db9f0278 | 2890 | args[0] = fn; |
15285f9f | 2891 | args[1] = arg1; |
a6e3fa71 JB |
2892 | GCPRO1 (args[0]); |
2893 | gcpro1.nvars = 2; | |
2894 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2895 | } |
2896 | ||
15285f9f | 2897 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2898 | /* ARGSUSED */ |
2899 | Lisp_Object | |
d3da34e0 | 2900 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2901 | { |
a6e3fa71 | 2902 | struct gcpro gcpro1; |
db9f0278 JB |
2903 | Lisp_Object args[3]; |
2904 | args[0] = fn; | |
15285f9f RS |
2905 | args[1] = arg1; |
2906 | args[2] = arg2; | |
a6e3fa71 JB |
2907 | GCPRO1 (args[0]); |
2908 | gcpro1.nvars = 3; | |
2909 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2910 | } |
2911 | ||
15285f9f | 2912 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2913 | /* ARGSUSED */ |
2914 | Lisp_Object | |
d3da34e0 | 2915 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2916 | { |
a6e3fa71 | 2917 | struct gcpro gcpro1; |
db9f0278 JB |
2918 | Lisp_Object args[4]; |
2919 | args[0] = fn; | |
15285f9f RS |
2920 | args[1] = arg1; |
2921 | args[2] = arg2; | |
2922 | args[3] = arg3; | |
a6e3fa71 JB |
2923 | GCPRO1 (args[0]); |
2924 | gcpro1.nvars = 4; | |
2925 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2926 | } |
2927 | ||
15285f9f | 2928 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2929 | /* ARGSUSED */ |
2930 | Lisp_Object | |
d3da34e0 JB |
2931 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2932 | Lisp_Object arg4) | |
a5a44b91 JB |
2933 | { |
2934 | struct gcpro gcpro1; | |
a5a44b91 JB |
2935 | Lisp_Object args[5]; |
2936 | args[0] = fn; | |
15285f9f RS |
2937 | args[1] = arg1; |
2938 | args[2] = arg2; | |
2939 | args[3] = arg3; | |
2940 | args[4] = arg4; | |
a5a44b91 JB |
2941 | GCPRO1 (args[0]); |
2942 | gcpro1.nvars = 5; | |
2943 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2944 | } |
2945 | ||
15285f9f RS |
2946 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2947 | /* ARGSUSED */ | |
2948 | Lisp_Object | |
d3da34e0 JB |
2949 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2950 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2951 | { |
2952 | struct gcpro gcpro1; | |
15285f9f RS |
2953 | Lisp_Object args[6]; |
2954 | args[0] = fn; | |
2955 | args[1] = arg1; | |
2956 | args[2] = arg2; | |
2957 | args[3] = arg3; | |
2958 | args[4] = arg4; | |
2959 | args[5] = arg5; | |
2960 | GCPRO1 (args[0]); | |
2961 | gcpro1.nvars = 6; | |
2962 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2963 | } |
2964 | ||
2965 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2966 | /* ARGSUSED */ | |
2967 | Lisp_Object | |
d3da34e0 JB |
2968 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2969 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2970 | { |
2971 | struct gcpro gcpro1; | |
15285f9f RS |
2972 | Lisp_Object args[7]; |
2973 | args[0] = fn; | |
2974 | args[1] = arg1; | |
2975 | args[2] = arg2; | |
2976 | args[3] = arg3; | |
2977 | args[4] = arg4; | |
2978 | args[5] = arg5; | |
2979 | args[6] = arg6; | |
2980 | GCPRO1 (args[0]); | |
2981 | gcpro1.nvars = 7; | |
2982 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2983 | } |
2984 | ||
574c05e2 KK |
2985 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7 */ |
2986 | /* ARGSUSED */ | |
2987 | Lisp_Object | |
d3da34e0 JB |
2988 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2989 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2990 | { |
2991 | struct gcpro gcpro1; | |
574c05e2 KK |
2992 | Lisp_Object args[8]; |
2993 | args[0] = fn; | |
2994 | args[1] = arg1; | |
2995 | args[2] = arg2; | |
2996 | args[3] = arg3; | |
2997 | args[4] = arg4; | |
2998 | args[5] = arg5; | |
2999 | args[6] = arg6; | |
3000 | args[7] = arg7; | |
3001 | GCPRO1 (args[0]); | |
3002 | gcpro1.nvars = 8; | |
3003 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
3004 | } |
3005 | ||
6c2ef893 RS |
3006 | /* The caller should GCPRO all the elements of ARGS. */ |
3007 | ||
b9598260 SM |
3008 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
3009 | doc: /* Return non-nil if OBJECT is a type of object that can be called as a function. */) | |
c566235d | 3010 | (Lisp_Object object) |
b9598260 SM |
3011 | { |
3012 | if (SYMBOLP (object) && !NILP (Ffboundp (object))) | |
3013 | { | |
3014 | object = Findirect_function (object, Qnil); | |
3015 | ||
3016 | if (CONSP (object) && EQ (XCAR (object), Qautoload)) | |
3017 | { | |
3018 | /* Autoloaded symbols are functions, except if they load | |
3019 | macros or keymaps. */ | |
3020 | int i; | |
3021 | for (i = 0; i < 4 && CONSP (object); i++) | |
3022 | object = XCDR (object); | |
3023 | ||
3024 | return (CONSP (object) && !NILP (XCAR (object))) ? Qnil : Qt; | |
3025 | } | |
3026 | } | |
3027 | ||
3028 | if (SUBRP (object)) | |
3c3ddb98 | 3029 | return (XSUBR (object)->max_args != UNEVALLED) ? Qt : Qnil; |
b9598260 SM |
3030 | else if (FUNVECP (object)) |
3031 | return Qt; | |
3032 | else if (CONSP (object)) | |
3033 | { | |
3034 | Lisp_Object car = XCAR (object); | |
3035 | return (EQ (car, Qlambda) || EQ (car, Qclosure)) ? Qt : Qnil; | |
3036 | } | |
3037 | else | |
3038 | return Qnil; | |
3039 | } | |
3040 | ||
db9f0278 | 3041 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
3042 | doc: /* Call first argument as a function, passing remaining arguments to it. |
3043 | Return the value that function returns. | |
3044 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
3045 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
5842a27b | 3046 | (int nargs, Lisp_Object *args) |
db9f0278 | 3047 | { |
8788120f | 3048 | Lisp_Object fun, original_fun; |
db9f0278 JB |
3049 | Lisp_Object funcar; |
3050 | int numargs = nargs - 1; | |
3051 | Lisp_Object lisp_numargs; | |
3052 | Lisp_Object val; | |
3053 | struct backtrace backtrace; | |
3054 | register Lisp_Object *internal_args; | |
3055 | register int i; | |
3056 | ||
3057 | QUIT; | |
ee830945 RS |
3058 | if ((consing_since_gc > gc_cons_threshold |
3059 | && consing_since_gc > gc_relative_threshold) | |
3060 | || | |
3061 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 3062 | Fgarbage_collect (); |
db9f0278 JB |
3063 | |
3064 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
3065 | { | |
3066 | if (max_lisp_eval_depth < 100) | |
3067 | max_lisp_eval_depth = 100; | |
3068 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 3069 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
3070 | } |
3071 | ||
3072 | backtrace.next = backtrace_list; | |
3073 | backtrace_list = &backtrace; | |
3074 | backtrace.function = &args[0]; | |
3075 | backtrace.args = &args[1]; | |
3076 | backtrace.nargs = nargs - 1; | |
3077 | backtrace.evalargs = 0; | |
3078 | backtrace.debug_on_exit = 0; | |
3079 | ||
3080 | if (debug_on_next_call) | |
3081 | do_debug_on_call (Qlambda); | |
3082 | ||
fff3ff9c KS |
3083 | CHECK_CONS_LIST (); |
3084 | ||
8788120f KS |
3085 | original_fun = args[0]; |
3086 | ||
db9f0278 JB |
3087 | retry: |
3088 | ||
8788120f KS |
3089 | /* Optimize for no indirection. */ |
3090 | fun = original_fun; | |
3091 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
3092 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
3093 | fun = indirect_function (fun); | |
db9f0278 | 3094 | |
90165123 | 3095 | if (SUBRP (fun)) |
db9f0278 | 3096 | { |
fff3ff9c | 3097 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
3098 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
3099 | { | |
a631e24c | 3100 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 3101 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
3102 | } |
3103 | ||
3104 | if (XSUBR (fun)->max_args == UNEVALLED) | |
734d55a2 | 3105 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3106 | |
3107 | if (XSUBR (fun)->max_args == MANY) | |
3108 | { | |
d5273788 | 3109 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); |
db9f0278 JB |
3110 | goto done; |
3111 | } | |
3112 | ||
3113 | if (XSUBR (fun)->max_args > numargs) | |
3114 | { | |
3115 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
72af86bd | 3116 | memcpy (internal_args, args + 1, numargs * sizeof (Lisp_Object)); |
db9f0278 JB |
3117 | for (i = numargs; i < XSUBR (fun)->max_args; i++) |
3118 | internal_args[i] = Qnil; | |
3119 | } | |
3120 | else | |
3121 | internal_args = args + 1; | |
3122 | switch (XSUBR (fun)->max_args) | |
3123 | { | |
3124 | case 0: | |
c0f2f16b | 3125 | val = (XSUBR (fun)->function.a0) (); |
db9f0278 JB |
3126 | goto done; |
3127 | case 1: | |
c0f2f16b | 3128 | val = (XSUBR (fun)->function.a1) (internal_args[0]); |
db9f0278 JB |
3129 | goto done; |
3130 | case 2: | |
c0f2f16b | 3131 | val = (XSUBR (fun)->function.a2) (internal_args[0], internal_args[1]); |
db9f0278 JB |
3132 | goto done; |
3133 | case 3: | |
c0f2f16b DN |
3134 | val = (XSUBR (fun)->function.a3) (internal_args[0], internal_args[1], |
3135 | internal_args[2]); | |
db9f0278 JB |
3136 | goto done; |
3137 | case 4: | |
c0f2f16b DN |
3138 | val = (XSUBR (fun)->function.a4) (internal_args[0], internal_args[1], |
3139 | internal_args[2], internal_args[3]); | |
db9f0278 JB |
3140 | goto done; |
3141 | case 5: | |
c0f2f16b DN |
3142 | val = (XSUBR (fun)->function.a5) (internal_args[0], internal_args[1], |
3143 | internal_args[2], internal_args[3], | |
3144 | internal_args[4]); | |
db9f0278 JB |
3145 | goto done; |
3146 | case 6: | |
c0f2f16b DN |
3147 | val = (XSUBR (fun)->function.a6) (internal_args[0], internal_args[1], |
3148 | internal_args[2], internal_args[3], | |
3149 | internal_args[4], internal_args[5]); | |
db9f0278 | 3150 | goto done; |
15c65264 | 3151 | case 7: |
c0f2f16b DN |
3152 | val = (XSUBR (fun)->function.a7) (internal_args[0], internal_args[1], |
3153 | internal_args[2], internal_args[3], | |
3154 | internal_args[4], internal_args[5], | |
3155 | internal_args[6]); | |
15c65264 | 3156 | goto done; |
db9f0278 | 3157 | |
166c822d | 3158 | case 8: |
c0f2f16b DN |
3159 | val = (XSUBR (fun)->function.a8) (internal_args[0], internal_args[1], |
3160 | internal_args[2], internal_args[3], | |
3161 | internal_args[4], internal_args[5], | |
3162 | internal_args[6], internal_args[7]); | |
166c822d KH |
3163 | goto done; |
3164 | ||
db9f0278 | 3165 | default: |
70ee42f7 | 3166 | |
166c822d | 3167 | /* If a subr takes more than 8 arguments without using MANY |
177c0ea7 | 3168 | or UNEVALLED, we need to extend this function to support it. |
70ee42f7 JB |
3169 | Until this is done, there is no way to call the function. */ |
3170 | abort (); | |
db9f0278 JB |
3171 | } |
3172 | } | |
b9598260 SM |
3173 | |
3174 | if (FUNVECP (fun)) | |
3175 | val = funcall_lambda (fun, numargs, args + 1, Qnil); | |
db9f0278 JB |
3176 | else |
3177 | { | |
8788120f | 3178 | if (EQ (fun, Qunbound)) |
734d55a2 | 3179 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 3180 | if (!CONSP (fun)) |
734d55a2 KS |
3181 | xsignal1 (Qinvalid_function, original_fun); |
3182 | funcar = XCAR (fun); | |
90165123 | 3183 | if (!SYMBOLP (funcar)) |
734d55a2 | 3184 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 3185 | if (EQ (funcar, Qlambda)) |
b9598260 SM |
3186 | val = funcall_lambda (fun, numargs, args + 1, Qnil); |
3187 | else if (EQ (funcar, Qclosure) | |
3188 | && CONSP (XCDR (fun)) | |
3189 | && CONSP (XCDR (XCDR (fun))) | |
3190 | && EQ (XCAR (XCDR (XCDR (fun))), Qlambda)) | |
3191 | val = funcall_lambda (XCDR (XCDR (fun)), numargs, args + 1, | |
3192 | XCAR (XCDR (fun))); | |
db9f0278 JB |
3193 | else if (EQ (funcar, Qautoload)) |
3194 | { | |
8788120f | 3195 | do_autoload (fun, original_fun); |
fff3ff9c | 3196 | CHECK_CONS_LIST (); |
db9f0278 JB |
3197 | goto retry; |
3198 | } | |
3199 | else | |
734d55a2 | 3200 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3201 | } |
3202 | done: | |
c1788fbc | 3203 | CHECK_CONS_LIST (); |
db9f0278 JB |
3204 | lisp_eval_depth--; |
3205 | if (backtrace.debug_on_exit) | |
3206 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
3207 | backtrace_list = backtrace.next; | |
3208 | return val; | |
3209 | } | |
3210 | \f | |
3211 | Lisp_Object | |
0ee81a0c SM |
3212 | apply_lambda (Lisp_Object fun, Lisp_Object args, int eval_flag, |
3213 | Lisp_Object lexenv) | |
db9f0278 JB |
3214 | { |
3215 | Lisp_Object args_left; | |
3216 | Lisp_Object numargs; | |
3217 | register Lisp_Object *arg_vector; | |
3218 | struct gcpro gcpro1, gcpro2, gcpro3; | |
3219 | register int i; | |
3220 | register Lisp_Object tem; | |
3a7a9129 | 3221 | USE_SAFE_ALLOCA; |
db9f0278 JB |
3222 | |
3223 | numargs = Flength (args); | |
b72e0717 | 3224 | SAFE_ALLOCA_LISP (arg_vector, XINT (numargs)); |
db9f0278 JB |
3225 | args_left = args; |
3226 | ||
3227 | GCPRO3 (*arg_vector, args_left, fun); | |
3228 | gcpro1.nvars = 0; | |
3229 | ||
3230 | for (i = 0; i < XINT (numargs);) | |
3231 | { | |
3232 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
3233 | if (eval_flag) tem = Feval (tem); | |
3234 | arg_vector[i++] = tem; | |
3235 | gcpro1.nvars = i; | |
3236 | } | |
3237 | ||
3238 | UNGCPRO; | |
3239 | ||
3240 | if (eval_flag) | |
3241 | { | |
3242 | backtrace_list->args = arg_vector; | |
3243 | backtrace_list->nargs = i; | |
3244 | } | |
3245 | backtrace_list->evalargs = 0; | |
b9598260 | 3246 | tem = funcall_lambda (fun, XINT (numargs), arg_vector, lexenv); |
db9f0278 JB |
3247 | |
3248 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3249 | if (backtrace_list->debug_on_exit) | |
3250 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3251 | /* Don't do it again when we return to eval. */ | |
3252 | backtrace_list->debug_on_exit = 0; | |
3a7a9129 | 3253 | SAFE_FREE (); |
db9f0278 JB |
3254 | return tem; |
3255 | } | |
3256 | ||
b9598260 SM |
3257 | |
3258 | /* Call a non-bytecode funvec object FUN, on the argments in ARGS (of | |
3259 | length NARGS). */ | |
3260 | ||
3261 | static Lisp_Object | |
c566235d | 3262 | funcall_funvec (Lisp_Object fun, int nargs, Lisp_Object *args) |
b9598260 SM |
3263 | { |
3264 | int size = FUNVEC_SIZE (fun); | |
3265 | Lisp_Object tag = (size > 0 ? AREF (fun, 0) : Qnil); | |
3266 | ||
3267 | if (EQ (tag, Qcurry)) | |
3268 | { | |
3269 | /* A curried function is a way to attach arguments to a another | |
3270 | function. The first element of the vector is the identifier | |
3271 | `curry', the second is the wrapped function, and remaining | |
3272 | elements are the attached arguments. */ | |
3273 | int num_curried_args = size - 2; | |
3274 | /* Offset of the curried and user args in the final arglist. Curried | |
3275 | args are first in the new arg vector, after the function. User | |
3276 | args follow. */ | |
3277 | int curried_args_offs = 1; | |
3278 | int user_args_offs = curried_args_offs + num_curried_args; | |
3279 | /* The curried function and arguments. */ | |
3280 | Lisp_Object *curry_params = XVECTOR (fun)->contents + 1; | |
3281 | /* The arguments in the curry vector. */ | |
3282 | Lisp_Object *curried_args = curry_params + 1; | |
3283 | /* The number of arguments with which we'll call funcall, and the | |
3284 | arguments themselves. */ | |
3285 | int num_funcall_args = 1 + num_curried_args + nargs; | |
3286 | Lisp_Object *funcall_args | |
3287 | = (Lisp_Object *) alloca (num_funcall_args * sizeof (Lisp_Object)); | |
3288 | ||
3289 | /* First comes the real function. */ | |
3290 | funcall_args[0] = curry_params[0]; | |
3291 | ||
3292 | /* Then the arguments in the appropriate order. */ | |
0bfdb86f AS |
3293 | memcpy (funcall_args + curried_args_offs, curried_args, |
3294 | num_curried_args * sizeof (Lisp_Object)); | |
3295 | memcpy (funcall_args + user_args_offs, args, | |
3296 | nargs * sizeof (Lisp_Object)); | |
b9598260 SM |
3297 | |
3298 | return Ffuncall (num_funcall_args, funcall_args); | |
3299 | } | |
3300 | else | |
3301 | xsignal1 (Qinvalid_function, fun); | |
3302 | } | |
3303 | ||
3304 | ||
db9f0278 JB |
3305 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR |
3306 | and return the result of evaluation. | |
3307 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3308 | ||
2901f1d1 | 3309 | static Lisp_Object |
0ee81a0c SM |
3310 | funcall_lambda (Lisp_Object fun, int nargs, |
3311 | register Lisp_Object *arg_vector, | |
3312 | Lisp_Object lexenv) | |
db9f0278 | 3313 | { |
9ab90667 | 3314 | Lisp_Object val, syms_left, next; |
aed13378 | 3315 | int count = SPECPDL_INDEX (); |
9ab90667 | 3316 | int i, optional, rest; |
db9f0278 | 3317 | |
b9598260 SM |
3318 | if (COMPILEDP (fun) |
3319 | && FUNVEC_SIZE (fun) > COMPILED_PUSH_ARGS | |
3320 | && ! NILP (XVECTOR (fun)->contents[COMPILED_PUSH_ARGS])) | |
3321 | /* A byte-code object with a non-nil `push args' slot means we | |
3322 | shouldn't bind any arguments, instead just call the byte-code | |
3323 | interpreter directly; it will push arguments as necessary. | |
3324 | ||
3325 | Byte-code objects with either a non-existant, or a nil value for | |
3326 | the `push args' slot (the default), have dynamically-bound | |
3327 | arguments, and use the argument-binding code below instead (as do | |
3328 | all interpreted functions, even lexically bound ones). */ | |
3329 | { | |
3330 | /* If we have not actually read the bytecode string | |
3331 | and constants vector yet, fetch them from the file. */ | |
3332 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
3333 | Ffetch_bytecode (fun); | |
3334 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
3335 | AREF (fun, COMPILED_CONSTANTS), | |
3336 | AREF (fun, COMPILED_STACK_DEPTH), | |
3337 | AREF (fun, COMPILED_ARGLIST), | |
3338 | nargs, arg_vector); | |
3339 | } | |
3340 | ||
3341 | if (FUNVECP (fun) && !FUNVEC_COMPILED_P (fun)) | |
3342 | /* Byte-compiled functions are handled directly below, but we | |
3343 | call other funvec types via funcall_funvec. */ | |
3344 | return funcall_funvec (fun, nargs, arg_vector); | |
3345 | ||
90165123 | 3346 | if (CONSP (fun)) |
9ab90667 GM |
3347 | { |
3348 | syms_left = XCDR (fun); | |
3349 | if (CONSP (syms_left)) | |
3350 | syms_left = XCAR (syms_left); | |
3351 | else | |
734d55a2 | 3352 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3353 | } |
90165123 | 3354 | else if (COMPILEDP (fun)) |
845975f5 | 3355 | syms_left = AREF (fun, COMPILED_ARGLIST); |
9ab90667 GM |
3356 | else |
3357 | abort (); | |
db9f0278 | 3358 | |
9ab90667 GM |
3359 | i = optional = rest = 0; |
3360 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3361 | { |
3362 | QUIT; | |
177c0ea7 | 3363 | |
9ab90667 | 3364 | next = XCAR (syms_left); |
8788120f | 3365 | if (!SYMBOLP (next)) |
734d55a2 | 3366 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3367 | |
db9f0278 JB |
3368 | if (EQ (next, Qand_rest)) |
3369 | rest = 1; | |
3370 | else if (EQ (next, Qand_optional)) | |
3371 | optional = 1; | |
3372 | else if (rest) | |
3373 | { | |
9ffa21d4 | 3374 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
3375 | i = nargs; |
3376 | } | |
db9f0278 | 3377 | else |
b9598260 SM |
3378 | { |
3379 | Lisp_Object val; | |
3380 | ||
3381 | /* Get the argument's actual value. */ | |
3382 | if (i < nargs) | |
3383 | val = arg_vector[i++]; | |
3384 | else if (!optional) | |
3385 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3386 | else | |
3387 | val = Qnil; | |
3388 | ||
3389 | /* Bind the argument. */ | |
3390 | if (!NILP (lexenv) | |
3391 | && SYMBOLP (next) && !XSYMBOL (next)->declared_special) | |
3392 | /* Lexically bind NEXT by adding it to the lexenv alist. */ | |
3393 | lexenv = Fcons (Fcons (next, val), lexenv); | |
3394 | else | |
3395 | /* Dynamically bind NEXT. */ | |
3396 | specbind (next, val); | |
3397 | } | |
db9f0278 JB |
3398 | } |
3399 | ||
9ab90667 | 3400 | if (!NILP (syms_left)) |
734d55a2 | 3401 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3402 | else if (i < nargs) |
734d55a2 | 3403 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3404 | |
b9598260 SM |
3405 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3406 | /* Instantiate a new lexical environment. */ | |
3407 | specbind (Qinternal_interpreter_environment, lexenv); | |
3408 | ||
90165123 | 3409 | if (CONSP (fun)) |
9ab90667 | 3410 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3411 | else |
ca248607 RS |
3412 | { |
3413 | /* If we have not actually read the bytecode string | |
3414 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3415 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3416 | Ffetch_bytecode (fun); |
b9598260 SM |
3417 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3418 | AREF (fun, COMPILED_CONSTANTS), | |
3419 | AREF (fun, COMPILED_STACK_DEPTH), | |
3420 | Qnil, 0, 0); | |
ca248607 | 3421 | } |
177c0ea7 | 3422 | |
db9f0278 JB |
3423 | return unbind_to (count, val); |
3424 | } | |
661c7d6e KH |
3425 | |
3426 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3427 | 1, 1, 0, |
3428 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3429 | (Lisp_Object object) |
661c7d6e KH |
3430 | { |
3431 | Lisp_Object tem; | |
3432 | ||
845975f5 | 3433 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3434 | { |
845975f5 | 3435 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3436 | if (!CONSP (tem)) |
845975f5 SM |
3437 | { |
3438 | tem = AREF (object, COMPILED_BYTECODE); | |
3439 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3440 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3441 | else |
3442 | error ("Invalid byte code"); | |
3443 | } | |
3ae565b3 SM |
3444 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3445 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3446 | } |
3447 | return object; | |
3448 | } | |
db9f0278 JB |
3449 | \f |
3450 | void | |
d3da34e0 | 3451 | grow_specpdl (void) |
db9f0278 | 3452 | { |
aed13378 | 3453 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3454 | if (specpdl_size >= max_specpdl_size) |
3455 | { | |
3456 | if (max_specpdl_size < 400) | |
3457 | max_specpdl_size = 400; | |
3458 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3459 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3460 | } |
3461 | specpdl_size *= 2; | |
3462 | if (specpdl_size > max_specpdl_size) | |
3463 | specpdl_size = max_specpdl_size; | |
3464 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3465 | specpdl_ptr = specpdl + count; | |
3466 | } | |
3467 | ||
4e2db1fe SM |
3468 | /* specpdl_ptr->symbol is a field which describes which variable is |
3469 | let-bound, so it can be properly undone when we unbind_to. | |
3470 | It can have the following two shapes: | |
3471 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3472 | a symbol that is not buffer-local (at least at the time | |
3473 | the let binding started). Note also that it should not be | |
3474 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3475 | to record V2 here). | |
3476 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3477 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3478 | which buffer is affected (or nil if the let-binding affects the | |
3479 | global value of the variable) and BUFFER tells us which buffer was | |
3480 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3481 | BUFFER did not yet have a buffer-local value). */ | |
3482 | ||
db9f0278 | 3483 | void |
d3da34e0 | 3484 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3485 | { |
ce5b453a SM |
3486 | struct Lisp_Symbol *sym; |
3487 | ||
3488 | eassert (!handling_signal); | |
db9f0278 | 3489 | |
b7826503 | 3490 | CHECK_SYMBOL (symbol); |
ce5b453a | 3491 | sym = XSYMBOL (symbol); |
db9f0278 JB |
3492 | if (specpdl_ptr == specpdl + specpdl_size) |
3493 | grow_specpdl (); | |
719177b3 | 3494 | |
ce5b453a SM |
3495 | start: |
3496 | switch (sym->redirect) | |
719177b3 | 3497 | { |
ce5b453a SM |
3498 | case SYMBOL_VARALIAS: |
3499 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3500 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3501 | /* The most common case is that of a non-constant symbol with a |
3502 | trivial value. Make that as fast as we can. */ | |
3503 | specpdl_ptr->symbol = symbol; | |
3504 | specpdl_ptr->old_value = SYMBOL_VAL (sym); | |
3505 | specpdl_ptr->func = NULL; | |
3506 | ++specpdl_ptr; | |
3507 | if (!sym->constant) | |
3508 | SET_SYMBOL_VAL (sym, value); | |
3509 | else | |
3510 | set_internal (symbol, value, Qnil, 1); | |
3511 | break; | |
4e2db1fe SM |
3512 | case SYMBOL_LOCALIZED: |
3513 | if (SYMBOL_BLV (sym)->frame_local) | |
3514 | error ("Frame-local vars cannot be let-bound"); | |
3515 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3516 | { |
3517 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3518 | specpdl_ptr->func = 0; | |
3519 | specpdl_ptr->old_value = ovalue; | |
3520 | ||
3521 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3522 | || (EQ (SYMBOL_BLV (sym)->where, | |
3523 | SYMBOL_BLV (sym)->frame_local ? | |
3524 | Fselected_frame () : Fcurrent_buffer ()))); | |
3525 | ||
3526 | if (sym->redirect == SYMBOL_LOCALIZED | |
3527 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3528 | { | |
3529 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3530 | ||
3531 | /* For a local variable, record both the symbol and which | |
3532 | buffer's or frame's value we are saving. */ | |
3533 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3534 | { | |
3535 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3536 | || (BLV_FOUND (SYMBOL_BLV (sym)) | |
3537 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); | |
3538 | where = cur_buf; | |
3539 | } | |
3540 | else if (sym->redirect == SYMBOL_LOCALIZED | |
3541 | && BLV_FOUND (SYMBOL_BLV (sym))) | |
3542 | where = SYMBOL_BLV (sym)->where; | |
3543 | else | |
3544 | where = Qnil; | |
3545 | ||
3546 | /* We're not using the `unused' slot in the specbinding | |
3547 | structure because this would mean we have to do more | |
3548 | work for simple variables. */ | |
3549 | /* FIXME: The third value `current_buffer' is only used in | |
3550 | let_shadows_buffer_binding_p which is itself only used | |
3551 | in set_internal for local_if_set. */ | |
4e2db1fe | 3552 | eassert (NILP (where) || EQ (where, cur_buf)); |
ce5b453a SM |
3553 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, cur_buf)); |
3554 | ||
3555 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3556 | buffer-local value here, make the `let' change the global | |
3557 | value by changing the value of SYMBOL in all buffers not | |
3558 | having their own value. This is consistent with what | |
3559 | happens with other buffer-local variables. */ | |
3560 | if (NILP (where) | |
3561 | && sym->redirect == SYMBOL_FORWARDED) | |
3562 | { | |
3563 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3564 | ++specpdl_ptr; | |
3565 | Fset_default (symbol, value); | |
3566 | return; | |
3567 | } | |
3568 | } | |
3569 | else | |
3570 | specpdl_ptr->symbol = symbol; | |
3571 | ||
3572 | specpdl_ptr++; | |
94b612ad | 3573 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3574 | break; |
3575 | } | |
3576 | default: abort (); | |
9ab90667 | 3577 | } |
db9f0278 JB |
3578 | } |
3579 | ||
3580 | void | |
d3da34e0 | 3581 | record_unwind_protect (Lisp_Object (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3582 | { |
9ba8e10d CY |
3583 | eassert (!handling_signal); |
3584 | ||
db9f0278 JB |
3585 | if (specpdl_ptr == specpdl + specpdl_size) |
3586 | grow_specpdl (); | |
3587 | specpdl_ptr->func = function; | |
3588 | specpdl_ptr->symbol = Qnil; | |
3589 | specpdl_ptr->old_value = arg; | |
3590 | specpdl_ptr++; | |
3591 | } | |
3592 | ||
3593 | Lisp_Object | |
d3da34e0 | 3594 | unbind_to (int count, Lisp_Object value) |
db9f0278 | 3595 | { |
5a073f50 KS |
3596 | Lisp_Object quitf = Vquit_flag; |
3597 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3598 | |
5a073f50 | 3599 | GCPRO2 (value, quitf); |
db9f0278 JB |
3600 | Vquit_flag = Qnil; |
3601 | ||
3602 | while (specpdl_ptr != specpdl + count) | |
3603 | { | |
611a8f8c RS |
3604 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3605 | the work to unbind it. We decrement first | |
3606 | so that an error in unbinding won't try to unbind | |
3607 | the same entry again, and we copy the binding first | |
3608 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3609 | |
45f266dc DL |
3610 | struct specbinding this_binding; |
3611 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3612 | |
3613 | if (this_binding.func != 0) | |
3614 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3615 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3616 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3617 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3618 | bound a variable that had a buffer-local or frame-local |
3619 | binding. WHERE nil means that the variable had the default | |
0967b4b0 | 3620 | value when it was bound. CURRENT-BUFFER is the buffer that |
bb8e180f | 3621 | was current when the variable was bound. */ |
611a8f8c | 3622 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3623 | { |
eb700b82 | 3624 | Lisp_Object symbol, where; |
719177b3 | 3625 | |
611a8f8c RS |
3626 | symbol = XCAR (this_binding.symbol); |
3627 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3628 | |
eb700b82 | 3629 | if (NILP (where)) |
611a8f8c | 3630 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3631 | /* If `where' is non-nil, reset the value in the appropriate |
3632 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3633 | else if (BUFFERP (where) |
3634 | ? !NILP (Flocal_variable_p (symbol, where)) | |
3635 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) | |
3636 | set_internal (symbol, this_binding.old_value, where, 1); | |
719177b3 | 3637 | } |
94b612ad SM |
3638 | /* If variable has a trivial value (no forwarding), we can |
3639 | just set it. No need to check for constant symbols here, | |
3640 | since that was already done by specbind. */ | |
3641 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3642 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3643 | this_binding.old_value); | |
db9f0278 | 3644 | else |
94b612ad SM |
3645 | /* NOTE: we only ever come here if make_local_foo was used for |
3646 | the first time on this var within this let. */ | |
3647 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3648 | } |
177c0ea7 | 3649 | |
5a073f50 KS |
3650 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3651 | Vquit_flag = quitf; | |
db9f0278 JB |
3652 | |
3653 | UNGCPRO; | |
db9f0278 JB |
3654 | return value; |
3655 | } | |
b9598260 | 3656 | |
db9f0278 | 3657 | \f |
b9598260 | 3658 | |
4a330052 | 3659 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3660 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3661 | A special variable is one that will be bound dynamically, even in a | |
3662 | context where binding is lexical by default. */) | |
c566235d | 3663 | (Lisp_Object symbol) |
b9598260 SM |
3664 | { |
3665 | CHECK_SYMBOL (symbol); | |
3666 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3667 | } | |
3668 | ||
3669 | \f | |
3670 | ||
3671 | DEFUN ("curry", Fcurry, Scurry, 1, MANY, 0, | |
3672 | doc: /* Return FUN curried with ARGS. | |
3673 | The result is a function-like object that will append any arguments it | |
3674 | is called with to ARGS, and call FUN with the resulting list of arguments. | |
3675 | ||
3676 | For instance: | |
3677 | (funcall (curry '+ 3 4 5) 2) is the same as (funcall '+ 3 4 5 2) | |
3678 | and: | |
3679 | (mapcar (curry 'concat "The ") '("a" "b" "c")) | |
3680 | => ("The a" "The b" "The c") | |
3681 | ||
3682 | usage: (curry FUN &rest ARGS) */) | |
c566235d | 3683 | (int nargs, Lisp_Object *args) |
b9598260 SM |
3684 | { |
3685 | return make_funvec (Qcurry, 0, nargs, args); | |
3686 | } | |
3687 | \f | |
3688 | ||
db9f0278 | 3689 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3690 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3691 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3692 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 JB |
3693 | { |
3694 | register struct backtrace *backlist = backtrace_list; | |
3695 | register int i; | |
3696 | ||
b7826503 | 3697 | CHECK_NUMBER (level); |
db9f0278 JB |
3698 | |
3699 | for (i = 0; backlist && i < XINT (level); i++) | |
3700 | { | |
3701 | backlist = backlist->next; | |
3702 | } | |
3703 | ||
3704 | if (backlist) | |
265a9e55 | 3705 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3706 | |
3707 | return flag; | |
3708 | } | |
3709 | ||
3710 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3711 | doc: /* Print a trace of Lisp function calls currently active. |
3712 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3713 | (void) |
db9f0278 JB |
3714 | { |
3715 | register struct backtrace *backlist = backtrace_list; | |
3716 | register int i; | |
3717 | Lisp_Object tail; | |
3718 | Lisp_Object tem; | |
db9f0278 | 3719 | struct gcpro gcpro1; |
d4b6d95d | 3720 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3721 | |
d4b6d95d LMI |
3722 | if (NILP (Vprint_level)) |
3723 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 JB |
3724 | |
3725 | tail = Qnil; | |
3726 | GCPRO1 (tail); | |
3727 | ||
3728 | while (backlist) | |
3729 | { | |
3730 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
3731 | if (backlist->nargs == UNEVALLED) | |
3732 | { | |
3733 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3734 | write_string ("\n", -1); |
db9f0278 JB |
3735 | } |
3736 | else | |
3737 | { | |
3738 | tem = *backlist->function; | |
3739 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
3740 | write_string ("(", -1); | |
3741 | if (backlist->nargs == MANY) | |
3742 | { | |
3743 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 3744 | !NILP (tail); |
db9f0278 JB |
3745 | tail = Fcdr (tail), i++) |
3746 | { | |
3747 | if (i) write_string (" ", -1); | |
3748 | Fprin1 (Fcar (tail), Qnil); | |
3749 | } | |
3750 | } | |
3751 | else | |
3752 | { | |
3753 | for (i = 0; i < backlist->nargs; i++) | |
3754 | { | |
3755 | if (i) write_string (" ", -1); | |
3756 | Fprin1 (backlist->args[i], Qnil); | |
3757 | } | |
3758 | } | |
b6703b02 | 3759 | write_string (")\n", -1); |
db9f0278 | 3760 | } |
db9f0278 JB |
3761 | backlist = backlist->next; |
3762 | } | |
3763 | ||
d4b6d95d | 3764 | Vprint_level = old_print_level; |
db9f0278 JB |
3765 | UNGCPRO; |
3766 | return Qnil; | |
3767 | } | |
3768 | ||
17401c97 | 3769 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3770 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3771 | If that frame has not evaluated the arguments yet (or is a special form), | |
3772 | the value is (nil FUNCTION ARG-FORMS...). | |
3773 | If that frame has evaluated its arguments and called its function already, | |
3774 | the value is (t FUNCTION ARG-VALUES...). | |
3775 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3776 | FUNCTION is whatever was supplied as car of evaluated list, | |
3777 | or a lambda expression for macro calls. | |
3778 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3779 | (Lisp_Object nframes) |
db9f0278 JB |
3780 | { |
3781 | register struct backtrace *backlist = backtrace_list; | |
3782 | register int i; | |
3783 | Lisp_Object tem; | |
3784 | ||
b7826503 | 3785 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3786 | |
3787 | /* Find the frame requested. */ | |
b6703b02 | 3788 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3789 | backlist = backlist->next; |
3790 | ||
3791 | if (!backlist) | |
3792 | return Qnil; | |
3793 | if (backlist->nargs == UNEVALLED) | |
3794 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
3795 | else | |
3796 | { | |
3797 | if (backlist->nargs == MANY) | |
3798 | tem = *backlist->args; | |
3799 | else | |
3800 | tem = Flist (backlist->nargs, backlist->args); | |
3801 | ||
3802 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3803 | } | |
3804 | } | |
a2ff3819 | 3805 | |
db9f0278 | 3806 | \f |
4ce0541e | 3807 | void |
d3da34e0 | 3808 | mark_backtrace (void) |
4ce0541e SM |
3809 | { |
3810 | register struct backtrace *backlist; | |
3811 | register int i; | |
3812 | ||
3813 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3814 | { | |
3815 | mark_object (*backlist->function); | |
3816 | ||
3817 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) | |
3818 | i = 0; | |
3819 | else | |
3820 | i = backlist->nargs - 1; | |
3821 | for (; i >= 0; i--) | |
3822 | mark_object (backlist->args[i]); | |
3823 | } | |
3824 | } | |
3825 | ||
dfcf069d | 3826 | void |
d3da34e0 | 3827 | syms_of_eval (void) |
db9f0278 JB |
3828 | { |
3829 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
82fc29a1 | 3830 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3831 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3832 | an error is signaled. |
3833 | You can safely use a value considerably larger than the default value, | |
3834 | if that proves inconveniently small. However, if you increase it too far, | |
3835 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 JB |
3836 | |
3837 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
9dbc9081 | 3838 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3839 | |
3840 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3841 | actual stack overflow in C, which would be fatal for Emacs. |
3842 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3843 | if that proves inconveniently small. However, if you increase it too far, |
3844 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 JB |
3845 | |
3846 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
9dbc9081 | 3847 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3848 | If the value is t, that means do an ordinary quit. |
3849 | If the value equals `throw-on-input', that means quit by throwing | |
3850 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3851 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3852 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3853 | Vquit_flag = Qnil; |
3854 | ||
3855 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
9dbc9081 PJ |
3856 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3857 | Note that `quit-flag' will still be set by typing C-g, | |
3858 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3859 | To prevent this happening, set `quit-flag' to nil | |
3860 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3861 | Vinhibit_quit = Qnil; |
3862 | ||
d67b4f80 | 3863 | Qinhibit_quit = intern_c_string ("inhibit-quit"); |
ad236261 JB |
3864 | staticpro (&Qinhibit_quit); |
3865 | ||
d67b4f80 | 3866 | Qautoload = intern_c_string ("autoload"); |
db9f0278 JB |
3867 | staticpro (&Qautoload); |
3868 | ||
d67b4f80 | 3869 | Qdebug_on_error = intern_c_string ("debug-on-error"); |
db9f0278 JB |
3870 | staticpro (&Qdebug_on_error); |
3871 | ||
d67b4f80 | 3872 | Qmacro = intern_c_string ("macro"); |
db9f0278 JB |
3873 | staticpro (&Qmacro); |
3874 | ||
d67b4f80 | 3875 | Qdeclare = intern_c_string ("declare"); |
d6edd563 | 3876 | staticpro (&Qdeclare); |
177c0ea7 | 3877 | |
db9f0278 JB |
3878 | /* Note that the process handling also uses Qexit, but we don't want |
3879 | to staticpro it twice, so we just do it here. */ | |
d67b4f80 | 3880 | Qexit = intern_c_string ("exit"); |
db9f0278 JB |
3881 | staticpro (&Qexit); |
3882 | ||
d67b4f80 | 3883 | Qinteractive = intern_c_string ("interactive"); |
db9f0278 JB |
3884 | staticpro (&Qinteractive); |
3885 | ||
d67b4f80 | 3886 | Qcommandp = intern_c_string ("commandp"); |
db9f0278 JB |
3887 | staticpro (&Qcommandp); |
3888 | ||
d67b4f80 | 3889 | Qdefun = intern_c_string ("defun"); |
db9f0278 JB |
3890 | staticpro (&Qdefun); |
3891 | ||
d67b4f80 | 3892 | Qand_rest = intern_c_string ("&rest"); |
db9f0278 JB |
3893 | staticpro (&Qand_rest); |
3894 | ||
d67b4f80 | 3895 | Qand_optional = intern_c_string ("&optional"); |
db9f0278 JB |
3896 | staticpro (&Qand_optional); |
3897 | ||
b9598260 SM |
3898 | Qclosure = intern_c_string ("closure"); |
3899 | staticpro (&Qclosure); | |
3900 | ||
3901 | Qcurry = intern_c_string ("curry"); | |
3902 | staticpro (&Qcurry); | |
3903 | ||
d67b4f80 | 3904 | Qdebug = intern_c_string ("debug"); |
f01cbfdd RS |
3905 | staticpro (&Qdebug); |
3906 | ||
128c0f66 | 3907 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
704788b3 RS |
3908 | doc: /* *Non-nil means errors display a backtrace buffer. |
3909 | More precisely, this happens for any error that is handled | |
3910 | by the editor command loop. | |
9dbc9081 PJ |
3911 | If the value is a list, an error only means to display a backtrace |
3912 | if one of its condition symbols appears in the list. */); | |
128c0f66 | 3913 | Vstack_trace_on_error = Qnil; |
db9f0278 | 3914 | |
128c0f66 | 3915 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
9dbc9081 PJ |
3916 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3917 | Does not apply to errors handled by `condition-case' or those | |
3918 | matched by `debug-ignored-errors'. | |
3919 | If the value is a list, an error only means to enter the debugger | |
3920 | if one of its condition symbols appears in the list. | |
3921 | When you evaluate an expression interactively, this variable | |
3922 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f CY |
3923 | The command `toggle-debug-on-error' toggles this. |
3924 | See also the variable `debug-on-quit'. */); | |
128c0f66 | 3925 | Vdebug_on_error = Qnil; |
db9f0278 | 3926 | |
fc950e09 | 3927 | DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors, |
9dbc9081 PJ |
3928 | doc: /* *List of errors for which the debugger should not be called. |
3929 | Each element may be a condition-name or a regexp that matches error messages. | |
3930 | If any element applies to a given error, that error skips the debugger | |
3931 | and just returns to top level. | |
3932 | This overrides the variable `debug-on-error'. | |
3933 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3934 | Vdebug_ignored_errors = Qnil; |
3935 | ||
db9f0278 | 3936 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, |
82fc29a1 JB |
3937 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3938 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3939 | debug_on_quit = 0; |
3940 | ||
3941 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
9dbc9081 | 3942 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3943 | |
556d7314 | 3944 | DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue, |
9dbc9081 PJ |
3945 | doc: /* Non-nil means debugger may continue execution. |
3946 | This is nil when the debugger is called under circumstances where it | |
3947 | might not be safe to continue. */); | |
dac204bc | 3948 | debugger_may_continue = 1; |
556d7314 | 3949 | |
db9f0278 | 3950 | DEFVAR_LISP ("debugger", &Vdebugger, |
9dbc9081 PJ |
3951 | doc: /* Function to call to invoke debugger. |
3952 | If due to frame exit, args are `exit' and the value being returned; | |
3953 | this function's value will be returned instead of that. | |
3954 | If due to error, args are `error' and a list of the args to `signal'. | |
3955 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3956 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3957 | Vdebugger = Qnil; |
3958 | ||
61ede770 | 3959 | DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function, |
9dbc9081 PJ |
3960 | doc: /* If non-nil, this is a function for `signal' to call. |
3961 | It receives the same arguments that `signal' was given. | |
3962 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3963 | Vsignal_hook_function = Qnil; |
3964 | ||
57a6e758 | 3965 | DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal, |
9dbc9081 PJ |
3966 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3967 | Note that `debug-on-error', `debug-on-quit' and friends | |
3968 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3969 | Vdebug_on_signal = Qnil; |
61ede770 | 3970 | |
d6edd563 GM |
3971 | DEFVAR_LISP ("macro-declaration-function", &Vmacro_declaration_function, |
3972 | doc: /* Function to process declarations in a macro definition. | |
3973 | The function will be called with two args MACRO and DECL. | |
3974 | MACRO is the name of the macro being defined. | |
3975 | DECL is a list `(declare ...)' containing the declarations. | |
3976 | The value the function returns is not used. */); | |
3977 | Vmacro_declaration_function = Qnil; | |
3978 | ||
b9598260 SM |
3979 | Qinternal_interpreter_environment |
3980 | = intern_c_string ("internal-interpreter-environment"); | |
3981 | staticpro (&Qinternal_interpreter_environment); | |
3982 | DEFVAR_LISP ("internal-interpreter-environment", | |
3983 | &Vinternal_interpreter_environment, | |
3984 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. | |
3985 | When lexical binding is not being used, this variable is nil. | |
3986 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3987 | alist of active lexical bindings. */); | |
3988 | Vinternal_interpreter_environment = Qnil; | |
3989 | ||
d67b4f80 | 3990 | Vrun_hooks = intern_c_string ("run-hooks"); |
6e6e9f08 | 3991 | staticpro (&Vrun_hooks); |
db9f0278 JB |
3992 | |
3993 | staticpro (&Vautoload_queue); | |
3994 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3995 | staticpro (&Vsignaling_function); |
3996 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3997 | |
3998 | defsubr (&Sor); | |
3999 | defsubr (&Sand); | |
4000 | defsubr (&Sif); | |
4001 | defsubr (&Scond); | |
4002 | defsubr (&Sprogn); | |
4003 | defsubr (&Sprog1); | |
4004 | defsubr (&Sprog2); | |
4005 | defsubr (&Ssetq); | |
4006 | defsubr (&Squote); | |
4007 | defsubr (&Sfunction); | |
4008 | defsubr (&Sdefun); | |
4009 | defsubr (&Sdefmacro); | |
4010 | defsubr (&Sdefvar); | |
19cebf5a | 4011 | defsubr (&Sdefvaralias); |
db9f0278 JB |
4012 | defsubr (&Sdefconst); |
4013 | defsubr (&Suser_variable_p); | |
4014 | defsubr (&Slet); | |
4015 | defsubr (&SletX); | |
4016 | defsubr (&Swhile); | |
4017 | defsubr (&Smacroexpand); | |
4018 | defsubr (&Scatch); | |
4019 | defsubr (&Sthrow); | |
4020 | defsubr (&Sunwind_protect); | |
4021 | defsubr (&Scondition_case); | |
4022 | defsubr (&Ssignal); | |
4023 | defsubr (&Sinteractive_p); | |
4b664e76 | 4024 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
4025 | defsubr (&Scommandp); |
4026 | defsubr (&Sautoload); | |
4027 | defsubr (&Seval); | |
4028 | defsubr (&Sapply); | |
4029 | defsubr (&Sfuncall); | |
ff936e53 SM |
4030 | defsubr (&Srun_hooks); |
4031 | defsubr (&Srun_hook_with_args); | |
4032 | defsubr (&Srun_hook_with_args_until_success); | |
4033 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 4034 | defsubr (&Sfetch_bytecode); |
b9598260 | 4035 | defsubr (&Scurry); |
db9f0278 JB |
4036 | defsubr (&Sbacktrace_debug); |
4037 | defsubr (&Sbacktrace); | |
4038 | defsubr (&Sbacktrace_frame); | |
b9598260 | 4039 | defsubr (&Scurry); |
4a330052 | 4040 | defsubr (&Sspecial_variable_p); |
b9598260 | 4041 | defsubr (&Sfunctionp); |
db9f0278 | 4042 | } |
ab5796a9 MB |
4043 | |
4044 | /* arch-tag: 014a07aa-33ab-4a8f-a3d2-ee8a4a9ff7fb | |
4045 | (do not change this comment) */ |