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, |
8cabe764 GM |
3 | 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
4 | Free Software Foundation, Inc. | |
db9f0278 JB |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
8 | GNU Emacs is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
684d6f5b | 10 | the Free Software Foundation; either version 3, or (at your option) |
db9f0278 JB |
11 | any later version. |
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 | |
19 | along with GNU Emacs; see the file COPYING. If not, write to | |
4fc5845f LK |
20 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
db9f0278 JB |
22 | |
23 | ||
18160b98 | 24 | #include <config.h> |
db9f0278 | 25 | #include "lisp.h" |
9ac0d9e0 | 26 | #include "blockinput.h" |
db9f0278 | 27 | #include "commands.h" |
1f98fa48 | 28 | #include "keyboard.h" |
3648c842 | 29 | #include "dispextern.h" |
db9f0278 JB |
30 | #include <setjmp.h> |
31 | ||
b70e1a2b SM |
32 | #if HAVE_X_WINDOWS |
33 | #include "xterm.h" | |
34 | #endif | |
35 | ||
db9f0278 JB |
36 | /* This definition is duplicated in alloc.c and keyboard.c */ |
37 | /* Putting it in lisp.h makes cc bomb out! */ | |
38 | ||
39 | struct backtrace | |
4c576a83 GM |
40 | { |
41 | struct backtrace *next; | |
42 | Lisp_Object *function; | |
43 | Lisp_Object *args; /* Points to vector of args. */ | |
44 | int nargs; /* Length of vector. | |
daa37602 JB |
45 | If nargs is UNEVALLED, args points to slot holding |
46 | list of unevalled args */ | |
4c576a83 GM |
47 | char evalargs; |
48 | /* Nonzero means call value of debugger when done with this operation. */ | |
49 | char debug_on_exit; | |
50 | }; | |
db9f0278 JB |
51 | |
52 | struct backtrace *backtrace_list; | |
53 | ||
82da7701 JB |
54 | /* This structure helps implement the `catch' and `throw' control |
55 | structure. A struct catchtag contains all the information needed | |
56 | to restore the state of the interpreter after a non-local jump. | |
57 | ||
58 | Handlers for error conditions (represented by `struct handler' | |
59 | structures) just point to a catch tag to do the cleanup required | |
60 | for their jumps. | |
61 | ||
62 | catchtag structures are chained together in the C calling stack; | |
63 | the `next' member points to the next outer catchtag. | |
64 | ||
65 | A call like (throw TAG VAL) searches for a catchtag whose `tag' | |
66 | member is TAG, and then unbinds to it. The `val' member is used to | |
67 | hold VAL while the stack is unwound; `val' is returned as the value | |
68 | of the catch form. | |
69 | ||
70 | All the other members are concerned with restoring the interpreter | |
71 | state. */ | |
4c576a83 | 72 | |
db9f0278 | 73 | struct catchtag |
4c576a83 GM |
74 | { |
75 | Lisp_Object tag; | |
76 | Lisp_Object val; | |
77 | struct catchtag *next; | |
78 | struct gcpro *gcpro; | |
79 | jmp_buf jmp; | |
80 | struct backtrace *backlist; | |
81 | struct handler *handlerlist; | |
82 | int lisp_eval_depth; | |
83 | int pdlcount; | |
84 | int poll_suppress_count; | |
2659a09f | 85 | int interrupt_input_blocked; |
4c576a83 GM |
86 | struct byte_stack *byte_stack; |
87 | }; | |
db9f0278 JB |
88 | |
89 | struct catchtag *catchlist; | |
90 | ||
15934ffa RS |
91 | #ifdef DEBUG_GCPRO |
92 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
93 | int gcpro_level; | |
94 | #endif | |
95 | ||
6fd797f5 | 96 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
ad236261 | 97 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
db9f0278 JB |
98 | Lisp_Object Qand_rest, Qand_optional; |
99 | Lisp_Object Qdebug_on_error; | |
d6edd563 | 100 | Lisp_Object Qdeclare; |
f01cbfdd | 101 | Lisp_Object Qdebug; |
db9f0278 | 102 | |
6e6e9f08 RS |
103 | /* This holds either the symbol `run-hooks' or nil. |
104 | It is nil at an early stage of startup, and when Emacs | |
105 | is shutting down. */ | |
4c576a83 | 106 | |
db9f0278 JB |
107 | Lisp_Object Vrun_hooks; |
108 | ||
109 | /* Non-nil means record all fset's and provide's, to be undone | |
110 | if the file being autoloaded is not fully loaded. | |
111 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 112 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
113 | |
114 | Lisp_Object Vautoload_queue; | |
115 | ||
116 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 117 | |
db9f0278 JB |
118 | int specpdl_size; |
119 | ||
120 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 121 | |
db9f0278 JB |
122 | struct specbinding *specpdl; |
123 | ||
124 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 125 | |
ab837828 | 126 | struct specbinding *specpdl_ptr; |
db9f0278 JB |
127 | |
128 | /* Maximum size allowed for specpdl allocation */ | |
4c576a83 | 129 | |
31ade731 | 130 | EMACS_INT max_specpdl_size; |
db9f0278 JB |
131 | |
132 | /* Depth in Lisp evaluations and function calls. */ | |
4c576a83 | 133 | |
db9f0278 JB |
134 | int lisp_eval_depth; |
135 | ||
136 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
4c576a83 | 137 | |
31ade731 | 138 | EMACS_INT max_lisp_eval_depth; |
db9f0278 JB |
139 | |
140 | /* Nonzero means enter debugger before next function call */ | |
4c576a83 | 141 | |
db9f0278 JB |
142 | int debug_on_next_call; |
143 | ||
1b1acc13 | 144 | /* Non-zero means debugger may continue. This is zero when the |
556d7314 GM |
145 | debugger is called during redisplay, where it might not be safe to |
146 | continue the interrupted redisplay. */ | |
147 | ||
148 | int debugger_may_continue; | |
149 | ||
128c0f66 | 150 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 151 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 152 | |
128c0f66 | 153 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 154 | |
128c0f66 | 155 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 156 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 157 | |
128c0f66 | 158 | Lisp_Object Vdebug_on_error; |
db9f0278 | 159 | |
fc950e09 | 160 | /* List of conditions and regexps specifying error messages which |
1b1acc13 | 161 | do not enter the debugger even if Vdebug_on_error says they should. */ |
4c576a83 | 162 | |
fc950e09 KH |
163 | Lisp_Object Vdebug_ignored_errors; |
164 | ||
61ede770 | 165 | /* Non-nil means call the debugger even if the error will be handled. */ |
4c576a83 | 166 | |
57a6e758 | 167 | Lisp_Object Vdebug_on_signal; |
61ede770 RS |
168 | |
169 | /* Hook for edebug to use. */ | |
4c576a83 | 170 | |
61ede770 RS |
171 | Lisp_Object Vsignal_hook_function; |
172 | ||
db9f0278 | 173 | /* Nonzero means enter debugger if a quit signal |
128c0f66 | 174 | is handled by the command loop's error handler. */ |
4c576a83 | 175 | |
db9f0278 JB |
176 | int debug_on_quit; |
177 | ||
be857679 | 178 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 179 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 180 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
181 | know that the debugger itself has an error, and we should just |
182 | signal the error instead of entering an infinite loop of debugger | |
183 | invocations. */ | |
4c576a83 | 184 | |
82da7701 | 185 | int when_entered_debugger; |
db9f0278 JB |
186 | |
187 | Lisp_Object Vdebugger; | |
188 | ||
a2ff3819 GM |
189 | /* The function from which the last `signal' was called. Set in |
190 | Fsignal. */ | |
191 | ||
192 | Lisp_Object Vsignaling_function; | |
193 | ||
4c576a83 GM |
194 | /* Set to non-zero while processing X events. Checked in Feval to |
195 | make sure the Lisp interpreter isn't called from a signal handler, | |
196 | which is unsafe because the interpreter isn't reentrant. */ | |
197 | ||
198 | int handling_signal; | |
199 | ||
d6edd563 GM |
200 | /* Function to process declarations in defmacro forms. */ |
201 | ||
202 | Lisp_Object Vmacro_declaration_function; | |
203 | ||
873759d5 | 204 | extern Lisp_Object Qrisky_local_variable; |
d6edd563 | 205 | |
1283140e RS |
206 | extern Lisp_Object Qfunction; |
207 | ||
2901f1d1 | 208 | static Lisp_Object funcall_lambda P_ ((Lisp_Object, int, Lisp_Object*)); |
2381d38d | 209 | static void unwind_to_catch P_ ((struct catchtag *, Lisp_Object)) NO_RETURN; |
eaa1e5ed EZ |
210 | |
211 | #if __GNUC__ | |
212 | /* "gcc -O3" enables automatic function inlining, which optimizes out | |
213 | the arguments for the invocations of these functions, whereas they | |
214 | expect these values on the stack. */ | |
215 | Lisp_Object apply1 () __attribute__((noinline)); | |
216 | Lisp_Object call2 () __attribute__((noinline)); | |
217 | #endif | |
873759d5 | 218 | \f |
dfcf069d | 219 | void |
db9f0278 JB |
220 | init_eval_once () |
221 | { | |
222 | specpdl_size = 50; | |
716acfce | 223 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 224 | specpdl_ptr = specpdl; |
6588243d | 225 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
a4547405 | 226 | max_specpdl_size = 1000; |
be436d23 | 227 | max_lisp_eval_depth = 400; |
34d470ba RS |
228 | |
229 | Vrun_hooks = Qnil; | |
db9f0278 JB |
230 | } |
231 | ||
dfcf069d | 232 | void |
db9f0278 JB |
233 | init_eval () |
234 | { | |
235 | specpdl_ptr = specpdl; | |
236 | catchlist = 0; | |
237 | handlerlist = 0; | |
238 | backtrace_list = 0; | |
239 | Vquit_flag = Qnil; | |
240 | debug_on_next_call = 0; | |
241 | lisp_eval_depth = 0; | |
87e21fbd | 242 | #ifdef DEBUG_GCPRO |
15934ffa | 243 | gcpro_level = 0; |
87e21fbd | 244 | #endif |
be857679 | 245 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 246 | when_entered_debugger = -1; |
db9f0278 JB |
247 | } |
248 | ||
9f5903bb RS |
249 | /* unwind-protect function used by call_debugger. */ |
250 | ||
251 | static Lisp_Object | |
252 | restore_stack_limits (data) | |
253 | Lisp_Object data; | |
254 | { | |
255 | max_specpdl_size = XINT (XCAR (data)); | |
256 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 257 | return Qnil; |
9f5903bb RS |
258 | } |
259 | ||
260 | /* Call the Lisp debugger, giving it argument ARG. */ | |
261 | ||
db9f0278 JB |
262 | Lisp_Object |
263 | call_debugger (arg) | |
264 | Lisp_Object arg; | |
265 | { | |
3648c842 | 266 | int debug_while_redisplaying; |
aed13378 | 267 | int count = SPECPDL_INDEX (); |
3648c842 | 268 | Lisp_Object val; |
9f5903bb | 269 | int old_max = max_specpdl_size; |
177c0ea7 | 270 | |
9f5903bb RS |
271 | /* Temporarily bump up the stack limits, |
272 | so the debugger won't run out of stack. */ | |
177c0ea7 | 273 | |
9f5903bb RS |
274 | max_specpdl_size += 1; |
275 | record_unwind_protect (restore_stack_limits, | |
276 | Fcons (make_number (old_max), | |
277 | make_number (max_lisp_eval_depth))); | |
278 | max_specpdl_size = old_max; | |
279 | ||
280 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
281 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
282 | ||
283 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
284 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 285 | |
d148e14d | 286 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
287 | if (display_hourglass_p) |
288 | cancel_hourglass (); | |
237c23b0 GM |
289 | #endif |
290 | ||
db9f0278 | 291 | debug_on_next_call = 0; |
be857679 | 292 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
293 | |
294 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
295 | displayed if the debugger is invoked during redisplay. */ | |
296 | debug_while_redisplaying = redisplaying_p; | |
297 | redisplaying_p = 0; | |
556d7314 GM |
298 | specbind (intern ("debugger-may-continue"), |
299 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 300 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 301 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
302 | |
303 | #if 0 /* Binding this prevents execution of Lisp code during | |
304 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 305 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 306 | #endif |
177c0ea7 | 307 | |
3648c842 GM |
308 | val = apply1 (Vdebugger, arg); |
309 | ||
310 | /* Interrupting redisplay and resuming it later is not safe under | |
311 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 312 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
313 | if (debug_while_redisplaying) |
314 | Ftop_level (); | |
315 | ||
556d7314 | 316 | return unbind_to (count, val); |
db9f0278 JB |
317 | } |
318 | ||
dfcf069d | 319 | void |
db9f0278 JB |
320 | do_debug_on_call (code) |
321 | Lisp_Object code; | |
322 | { | |
323 | debug_on_next_call = 0; | |
324 | backtrace_list->debug_on_exit = 1; | |
325 | call_debugger (Fcons (code, Qnil)); | |
326 | } | |
327 | \f | |
328 | /* NOTE!!! Every function that can call EVAL must protect its args | |
329 | and temporaries from garbage collection while it needs them. | |
330 | The definition of `For' shows what you have to do. */ | |
331 | ||
332 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
333 | doc: /* Eval args until one of them yields non-nil, then return that value. |
334 | The remaining args are not evalled at all. | |
335 | If all args return nil, return nil. | |
533eb34b | 336 | usage: (or CONDITIONS...) */) |
9dbc9081 | 337 | (args) |
db9f0278 JB |
338 | Lisp_Object args; |
339 | { | |
e509f168 | 340 | register Lisp_Object val = Qnil; |
db9f0278 JB |
341 | struct gcpro gcpro1; |
342 | ||
e509f168 | 343 | GCPRO1 (args); |
db9f0278 | 344 | |
e509f168 | 345 | while (CONSP (args)) |
db9f0278 | 346 | { |
e509f168 | 347 | val = Feval (XCAR (args)); |
265a9e55 | 348 | if (!NILP (val)) |
db9f0278 | 349 | break; |
e509f168 | 350 | args = XCDR (args); |
db9f0278 | 351 | } |
db9f0278 JB |
352 | |
353 | UNGCPRO; | |
354 | return val; | |
355 | } | |
356 | ||
357 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 358 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
359 | The remaining args are not evalled at all. |
360 | If no arg yields nil, return the last arg's value. | |
533eb34b | 361 | usage: (and CONDITIONS...) */) |
9dbc9081 | 362 | (args) |
db9f0278 JB |
363 | Lisp_Object args; |
364 | { | |
e509f168 | 365 | register Lisp_Object val = Qt; |
db9f0278 JB |
366 | struct gcpro gcpro1; |
367 | ||
e509f168 | 368 | GCPRO1 (args); |
db9f0278 | 369 | |
e509f168 | 370 | while (CONSP (args)) |
db9f0278 | 371 | { |
e509f168 | 372 | val = Feval (XCAR (args)); |
265a9e55 | 373 | if (NILP (val)) |
db9f0278 | 374 | break; |
e509f168 | 375 | args = XCDR (args); |
db9f0278 | 376 | } |
db9f0278 JB |
377 | |
378 | UNGCPRO; | |
379 | return val; | |
380 | } | |
381 | ||
382 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 383 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
384 | Returns the value of THEN or the value of the last of the ELSE's. |
385 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
386 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 387 | usage: (if COND THEN ELSE...) */) |
9dbc9081 | 388 | (args) |
db9f0278 JB |
389 | Lisp_Object args; |
390 | { | |
391 | register Lisp_Object cond; | |
392 | struct gcpro gcpro1; | |
393 | ||
394 | GCPRO1 (args); | |
395 | cond = Feval (Fcar (args)); | |
396 | UNGCPRO; | |
397 | ||
265a9e55 | 398 | if (!NILP (cond)) |
db9f0278 JB |
399 | return Feval (Fcar (Fcdr (args))); |
400 | return Fprogn (Fcdr (Fcdr (args))); | |
401 | } | |
402 | ||
403 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
404 | doc: /* Try each clause until one succeeds. |
405 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
406 | and, if the value is non-nil, this clause succeeds: | |
407 | then the expressions in BODY are evaluated and the last one's | |
408 | value is the value of the cond-form. | |
409 | If no clause succeeds, cond returns nil. | |
410 | If a clause has one element, as in (CONDITION), | |
411 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 412 | usage: (cond CLAUSES...) */) |
9dbc9081 | 413 | (args) |
db9f0278 JB |
414 | Lisp_Object args; |
415 | { | |
416 | register Lisp_Object clause, val; | |
417 | struct gcpro gcpro1; | |
418 | ||
419 | val = Qnil; | |
420 | GCPRO1 (args); | |
265a9e55 | 421 | while (!NILP (args)) |
db9f0278 JB |
422 | { |
423 | clause = Fcar (args); | |
424 | val = Feval (Fcar (clause)); | |
265a9e55 | 425 | if (!NILP (val)) |
db9f0278 | 426 | { |
03699b14 KR |
427 | if (!EQ (XCDR (clause), Qnil)) |
428 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
429 | break; |
430 | } | |
03699b14 | 431 | args = XCDR (args); |
db9f0278 JB |
432 | } |
433 | UNGCPRO; | |
434 | ||
435 | return val; | |
436 | } | |
437 | ||
438 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
9dbc9081 | 439 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 440 | usage: (progn BODY...) */) |
9dbc9081 | 441 | (args) |
db9f0278 JB |
442 | Lisp_Object args; |
443 | { | |
e509f168 | 444 | register Lisp_Object val = Qnil; |
db9f0278 JB |
445 | struct gcpro gcpro1; |
446 | ||
e509f168 | 447 | GCPRO1 (args); |
db9f0278 | 448 | |
e509f168 | 449 | while (CONSP (args)) |
db9f0278 | 450 | { |
e509f168 SM |
451 | val = Feval (XCAR (args)); |
452 | args = XCDR (args); | |
db9f0278 | 453 | } |
db9f0278 JB |
454 | |
455 | UNGCPRO; | |
456 | return val; | |
457 | } | |
458 | ||
459 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
460 | doc: /* Eval FIRST and BODY sequentially; value from FIRST. |
461 | The value of FIRST is saved during the evaluation of the remaining args, | |
462 | whose values are discarded. | |
7a25dc6d | 463 | usage: (prog1 FIRST BODY...) */) |
9dbc9081 | 464 | (args) |
db9f0278 JB |
465 | Lisp_Object args; |
466 | { | |
467 | Lisp_Object val; | |
468 | register Lisp_Object args_left; | |
469 | struct gcpro gcpro1, gcpro2; | |
470 | register int argnum = 0; | |
471 | ||
9ac66b45 | 472 | if (NILP (args)) |
db9f0278 JB |
473 | return Qnil; |
474 | ||
475 | args_left = args; | |
476 | val = Qnil; | |
477 | GCPRO2 (args, val); | |
478 | ||
479 | do | |
480 | { | |
481 | if (!(argnum++)) | |
482 | val = Feval (Fcar (args_left)); | |
483 | else | |
484 | Feval (Fcar (args_left)); | |
485 | args_left = Fcdr (args_left); | |
486 | } | |
265a9e55 | 487 | while (!NILP(args_left)); |
db9f0278 JB |
488 | |
489 | UNGCPRO; | |
490 | return val; | |
491 | } | |
492 | ||
493 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
82fc29a1 JB |
494 | doc: /* Eval FORM1, FORM2 and BODY sequentially; value from FORM2. |
495 | The value of FORM2 is saved during the evaluation of the | |
496 | remaining args, whose values are discarded. | |
497 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
9dbc9081 | 498 | (args) |
db9f0278 JB |
499 | Lisp_Object args; |
500 | { | |
501 | Lisp_Object val; | |
502 | register Lisp_Object args_left; | |
503 | struct gcpro gcpro1, gcpro2; | |
504 | register int argnum = -1; | |
505 | ||
506 | val = Qnil; | |
507 | ||
87d238ba | 508 | if (NILP (args)) |
db9f0278 JB |
509 | return Qnil; |
510 | ||
511 | args_left = args; | |
512 | val = Qnil; | |
513 | GCPRO2 (args, val); | |
514 | ||
515 | do | |
516 | { | |
517 | if (!(argnum++)) | |
518 | val = Feval (Fcar (args_left)); | |
519 | else | |
520 | Feval (Fcar (args_left)); | |
521 | args_left = Fcdr (args_left); | |
522 | } | |
87d238ba | 523 | while (!NILP (args_left)); |
db9f0278 JB |
524 | |
525 | UNGCPRO; | |
526 | return val; | |
527 | } | |
528 | ||
529 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
530 | doc: /* Set each SYM to the value of its VAL. |
531 | The symbols SYM are variables; they are literal (not evaluated). | |
532 | The values VAL are expressions; they are evaluated. | |
533 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
534 | The second VAL is not computed until after the first SYM is set, and so on; | |
535 | each VAL can use the new value of variables set earlier in the `setq'. | |
536 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 537 | usage: (setq [SYM VAL]...) */) |
9dbc9081 | 538 | (args) |
db9f0278 JB |
539 | Lisp_Object args; |
540 | { | |
541 | register Lisp_Object args_left; | |
542 | register Lisp_Object val, sym; | |
543 | struct gcpro gcpro1; | |
544 | ||
1283140e | 545 | if (NILP (args)) |
db9f0278 JB |
546 | return Qnil; |
547 | ||
548 | args_left = args; | |
549 | GCPRO1 (args); | |
550 | ||
551 | do | |
552 | { | |
553 | val = Feval (Fcar (Fcdr (args_left))); | |
554 | sym = Fcar (args_left); | |
555 | Fset (sym, val); | |
556 | args_left = Fcdr (Fcdr (args_left)); | |
557 | } | |
265a9e55 | 558 | while (!NILP(args_left)); |
db9f0278 JB |
559 | |
560 | UNGCPRO; | |
561 | return val; | |
562 | } | |
177c0ea7 | 563 | |
db9f0278 | 564 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
565 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
566 | usage: (quote ARG) */) | |
567 | (args) | |
db9f0278 JB |
568 | Lisp_Object args; |
569 | { | |
1283140e RS |
570 | if (!NILP (Fcdr (args))) |
571 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
572 | return Fcar (args); |
573 | } | |
177c0ea7 | 574 | |
db9f0278 | 575 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
576 | doc: /* Like `quote', but preferred for objects which are functions. |
577 | In byte compilation, `function' causes its argument to be compiled. | |
578 | `quote' cannot do that. | |
579 | usage: (function ARG) */) | |
580 | (args) | |
db9f0278 JB |
581 | Lisp_Object args; |
582 | { | |
1283140e RS |
583 | if (!NILP (Fcdr (args))) |
584 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
db9f0278 JB |
585 | return Fcar (args); |
586 | } | |
587 | ||
e0f331ab | 588 | |
db9f0278 | 589 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
c63df42b | 590 | doc: /* Return t if the function was run directly by user input. |
82fc29a1 JB |
591 | This means that the function was called with `call-interactively' |
592 | \(which includes being called as the binding of a key) | |
c63df42b RS |
593 | and input is currently coming from the keyboard (not in keyboard macro), |
594 | and Emacs is not running in batch mode (`noninteractive' is nil). | |
595 | ||
596 | The only known proper use of `interactive-p' is in deciding whether to | |
597 | display a helpful message, or how to display it. If you're thinking | |
598 | of using it for any other purpose, it is quite likely that you're | |
599 | making a mistake. Think: what do you want to do when the command is | |
600 | called from a keyboard macro? | |
601 | ||
602 | If you want to test whether your function was called with | |
603 | `call-interactively', the way to do that is by adding an extra | |
604 | optional argument, and making the `interactive' spec specify non-nil | |
605 | unconditionally for that argument. (`p' is a good way to do this.) */) | |
9dbc9081 | 606 | () |
db9f0278 | 607 | { |
c63df42b | 608 | return (INTERACTIVE && interactive_p (1)) ? Qt : Qnil; |
e0f331ab GM |
609 | } |
610 | ||
611 | ||
4b664e76 | 612 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 0, 0, |
82fc29a1 | 613 | doc: /* Return t if the function using this was called with `call-interactively'. |
c63df42b RS |
614 | This is used for implementing advice and other function-modifying |
615 | features of Emacs. | |
616 | ||
617 | The cleanest way to test whether your function was called with | |
82fc29a1 JB |
618 | `call-interactively' is by adding an extra optional argument, |
619 | and making the `interactive' spec specify non-nil unconditionally | |
620 | for that argument. (`p' is a good way to do this.) */) | |
c63df42b RS |
621 | () |
622 | { | |
0b31741c | 623 | return interactive_p (1) ? Qt : Qnil; |
c63df42b RS |
624 | } |
625 | ||
626 | ||
627 | /* Return 1 if function in which this appears was called using | |
628 | call-interactively. | |
e0f331ab GM |
629 | |
630 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
631 | called is a built-in. */ | |
632 | ||
633 | int | |
634 | interactive_p (exclude_subrs_p) | |
635 | int exclude_subrs_p; | |
636 | { | |
637 | struct backtrace *btp; | |
638 | Lisp_Object fun; | |
db9f0278 | 639 | |
db9f0278 | 640 | btp = backtrace_list; |
daa37602 JB |
641 | |
642 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 643 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 644 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
645 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
646 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 647 | btp = btp->next; |
daa37602 JB |
648 | |
649 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
650 | may be a frame for Fbytecode at the top level. In any version of |
651 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
652 | inside catch and condition-case. Skip past them. | |
daa37602 | 653 | |
4402a9ed | 654 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 655 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
656 | while (btp |
657 | && (EQ (*btp->function, Qbytecode) | |
658 | || btp->nargs == UNEVALLED)) | |
a6e3fa71 JB |
659 | btp = btp->next; |
660 | ||
daa37602 JB |
661 | /* btp now points at the frame of the innermost function that isn't |
662 | a special form, ignoring frames for Finteractive_p and/or | |
663 | Fbytecode at the top. If this frame is for a built-in function | |
664 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 665 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
666 | if (exclude_subrs_p && SUBRP (fun)) |
667 | return 0; | |
177c0ea7 | 668 | |
db9f0278 JB |
669 | /* btp points to the frame of a Lisp function that called interactive-p. |
670 | Return t if that function was called interactively. */ | |
671 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
672 | return 1; |
673 | return 0; | |
db9f0278 JB |
674 | } |
675 | ||
e0f331ab | 676 | |
db9f0278 | 677 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
678 | doc: /* Define NAME as a function. |
679 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
680 | See also the function `interactive'. | |
7a25dc6d | 681 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
9dbc9081 | 682 | (args) |
db9f0278 JB |
683 | Lisp_Object args; |
684 | { | |
685 | register Lisp_Object fn_name; | |
686 | register Lisp_Object defn; | |
687 | ||
688 | fn_name = Fcar (args); | |
6992a868 | 689 | CHECK_SYMBOL (fn_name); |
db9f0278 | 690 | defn = Fcons (Qlambda, Fcdr (args)); |
265a9e55 | 691 | if (!NILP (Vpurify_flag)) |
db9f0278 | 692 | defn = Fpurecopy (defn); |
f58e9f8c RS |
693 | if (CONSP (XSYMBOL (fn_name)->function) |
694 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
695 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 696 | Ffset (fn_name, defn); |
6fd797f5 | 697 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
698 | return fn_name; |
699 | } | |
700 | ||
701 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 702 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
703 | The actual definition looks like |
704 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
705 | When the macro is called, as in (NAME ARGS...), |
706 | the function (lambda ARGLIST BODY...) is applied to | |
707 | the list ARGS... as it appears in the expression, | |
708 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
709 | |
710 | DECL is a declaration, optional, which can specify how to indent | |
711 | calls to this macro and how Edebug should handle it. It looks like this: | |
712 | (declare SPECS...) | |
713 | The elements can look like this: | |
714 | (indent INDENT) | |
715 | Set NAME's `lisp-indent-function' property to INDENT. | |
716 | ||
e509f168 | 717 | (debug DEBUG) |
0654d6e3 | 718 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 719 | equivalent to writing a `def-edebug-spec' for the macro.) |
0654d6e3 | 720 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
9dbc9081 | 721 | (args) |
db9f0278 JB |
722 | Lisp_Object args; |
723 | { | |
724 | register Lisp_Object fn_name; | |
725 | register Lisp_Object defn; | |
d6edd563 | 726 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
727 | |
728 | fn_name = Fcar (args); | |
8e975df9 | 729 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
730 | lambda_list = Fcar (Fcdr (args)); |
731 | tail = Fcdr (Fcdr (args)); | |
732 | ||
733 | doc = Qnil; | |
734 | if (STRINGP (Fcar (tail))) | |
735 | { | |
e509f168 SM |
736 | doc = XCAR (tail); |
737 | tail = XCDR (tail); | |
d6edd563 GM |
738 | } |
739 | ||
740 | while (CONSP (Fcar (tail)) | |
741 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
742 | { | |
743 | if (!NILP (Vmacro_declaration_function)) | |
744 | { | |
745 | struct gcpro gcpro1; | |
746 | GCPRO1 (args); | |
747 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
748 | UNGCPRO; | |
749 | } | |
177c0ea7 | 750 | |
d6edd563 GM |
751 | tail = Fcdr (tail); |
752 | } | |
753 | ||
754 | if (NILP (doc)) | |
755 | tail = Fcons (lambda_list, tail); | |
756 | else | |
757 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
758 | defn = Fcons (Qmacro, Fcons (Qlambda, tail)); | |
177c0ea7 | 759 | |
265a9e55 | 760 | if (!NILP (Vpurify_flag)) |
db9f0278 | 761 | defn = Fpurecopy (defn); |
f58e9f8c RS |
762 | if (CONSP (XSYMBOL (fn_name)->function) |
763 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
764 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 765 | Ffset (fn_name, defn); |
6fd797f5 | 766 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
767 | return fn_name; |
768 | } | |
769 | ||
19cebf5a | 770 | |
1848d15d | 771 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 772 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 773 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 774 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
775 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
776 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
777 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
778 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 JB |
779 | The return value is BASE-VARIABLE. */) |
780 | (new_alias, base_variable, docstring) | |
781 | Lisp_Object new_alias, base_variable, docstring; | |
19cebf5a GM |
782 | { |
783 | struct Lisp_Symbol *sym; | |
1848d15d | 784 | |
4a9308b8 JB |
785 | CHECK_SYMBOL (new_alias); |
786 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 787 | |
4a9308b8 | 788 | if (SYMBOL_CONSTANT_P (new_alias)) |
19cebf5a GM |
789 | error ("Cannot make a constant an alias"); |
790 | ||
4a9308b8 | 791 | sym = XSYMBOL (new_alias); |
dd60787c GM |
792 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
793 | If n_a is bound, but b_v is not, set the value of b_v to n_a. | |
794 | This is for the sake of define-obsolete-variable-alias and user | |
795 | customizations. */ | |
796 | if (NILP (Fboundp (base_variable)) && !NILP (Fboundp (new_alias))) | |
797 | XSYMBOL(base_variable)->value = sym->value; | |
19cebf5a | 798 | sym->indirect_variable = 1; |
4a9308b8 JB |
799 | sym->value = base_variable; |
800 | sym->constant = SYMBOL_CONSTANT_P (base_variable); | |
801 | LOADHIST_ATTACH (new_alias); | |
1848d15d | 802 | if (!NILP (docstring)) |
4a9308b8 | 803 | Fput (new_alias, Qvariable_documentation, docstring); |
bd81fcf8 | 804 | else |
4a9308b8 | 805 | Fput (new_alias, Qvariable_documentation, Qnil); |
1848d15d | 806 | |
4a9308b8 | 807 | return base_variable; |
19cebf5a GM |
808 | } |
809 | ||
810 | ||
db9f0278 | 811 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 812 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
813 | You are not required to define a variable in order to use it, |
814 | but the definition can supply documentation and an initial value | |
815 | in a way that tags can recognize. | |
816 | ||
817 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
818 | If SYMBOL is buffer-local, its default value is what is set; | |
819 | buffer-local values are not affected. | |
820 | INITVALUE and DOCSTRING are optional. | |
821 | If DOCSTRING starts with *, this variable is identified as a user option. | |
822 | This means that M-x set-variable recognizes it. | |
823 | See also `user-variable-p'. | |
824 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
825 | |
826 | If SYMBOL has a local binding, then this form affects the local | |
827 | binding. This is usually not what you want. Thus, if you need to | |
828 | load a file defining variables, with this form or with `defconst' or | |
829 | `defcustom', you should always load that file _outside_ any bindings | |
830 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
831 | this respect.) | |
2df5238c | 832 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
9dbc9081 | 833 | (args) |
db9f0278 JB |
834 | Lisp_Object args; |
835 | { | |
a42ba017 | 836 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
837 | |
838 | sym = Fcar (args); | |
a42ba017 RS |
839 | tail = Fcdr (args); |
840 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 841 | error ("Too many arguments"); |
a42ba017 | 842 | |
33568849 | 843 | tem = Fdefault_boundp (sym); |
a42ba017 | 844 | if (!NILP (tail)) |
db9f0278 | 845 | { |
1c9916a1 SM |
846 | if (SYMBOL_CONSTANT_P (sym)) |
847 | { | |
848 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
849 | Lisp_Object tem = Fcar (tail); | |
850 | if (! (CONSP (tem) | |
851 | && EQ (XCAR (tem), Qquote) | |
852 | && CONSP (XCDR (tem)) | |
853 | && EQ (XCAR (XCDR (tem)), sym))) | |
854 | error ("Constant symbol `%s' specified in defvar", | |
855 | SDATA (SYMBOL_NAME (sym))); | |
856 | } | |
857 | ||
265a9e55 | 858 | if (NILP (tem)) |
33568849 | 859 | Fset_default (sym, Feval (Fcar (tail))); |
d0bce91e SM |
860 | else |
861 | { /* Check if there is really a global binding rather than just a let | |
862 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 863 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
864 | while (--pdl >= specpdl) |
865 | { | |
866 | if (EQ (pdl->symbol, sym) && !pdl->func | |
867 | && EQ (pdl->old_value, Qunbound)) | |
868 | { | |
869 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
870 | SYMBOL_NAME (sym), 1); | |
871 | break; | |
872 | } | |
873 | } | |
874 | } | |
33568849 | 875 | tail = Fcdr (tail); |
e509f168 SM |
876 | tem = Fcar (tail); |
877 | if (!NILP (tem)) | |
33568849 | 878 | { |
33568849 SM |
879 | if (!NILP (Vpurify_flag)) |
880 | tem = Fpurecopy (tem); | |
881 | Fput (sym, Qvariable_documentation, tem); | |
882 | } | |
6fd797f5 | 883 | LOADHIST_ATTACH (sym); |
db9f0278 | 884 | } |
33568849 | 885 | else |
d7c1d0fc RS |
886 | /* Simple (defvar <var>) should not count as a definition at all. |
887 | It could get in the way of other definitions, and unloading this | |
888 | package could try to make the variable unbound. */ | |
addf35fd AS |
889 | ; |
890 | ||
db9f0278 JB |
891 | return sym; |
892 | } | |
893 | ||
894 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
895 | doc: /* Define SYMBOL as a constant variable. |
896 | The intent is that neither programs nor users should ever change this value. | |
897 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
898 | If SYMBOL is buffer-local, its default value is what is set; | |
899 | buffer-local values are not affected. | |
900 | DOCSTRING is optional. | |
733f68b6 LT |
901 | |
902 | If SYMBOL has a local binding, then this form sets the local binding's | |
903 | value. However, you should normally not make local bindings for | |
904 | variables defined with this form. | |
7a25dc6d | 905 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
9dbc9081 | 906 | (args) |
db9f0278 JB |
907 | Lisp_Object args; |
908 | { | |
909 | register Lisp_Object sym, tem; | |
910 | ||
911 | sym = Fcar (args); | |
a42ba017 | 912 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 913 | error ("Too many arguments"); |
a42ba017 | 914 | |
1182a7cb DL |
915 | tem = Feval (Fcar (Fcdr (args))); |
916 | if (!NILP (Vpurify_flag)) | |
917 | tem = Fpurecopy (tem); | |
918 | Fset_default (sym, tem); | |
db9f0278 | 919 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 920 | if (!NILP (tem)) |
db9f0278 | 921 | { |
265a9e55 | 922 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
923 | tem = Fpurecopy (tem); |
924 | Fput (sym, Qvariable_documentation, tem); | |
925 | } | |
873759d5 | 926 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 927 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
928 | return sym; |
929 | } | |
930 | ||
606cdb89 JB |
931 | /* Error handler used in Fuser_variable_p. */ |
932 | static Lisp_Object | |
933 | user_variable_p_eh (ignore) | |
934 | Lisp_Object ignore; | |
935 | { | |
936 | return Qnil; | |
937 | } | |
938 | ||
db9f0278 | 939 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 940 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 941 | \(The alternative is a variable used internally in a Lisp program.) |
606cdb89 JB |
942 | A variable is a user variable if |
943 | \(1) the first character of its documentation is `*', or | |
944 | \(2) it is customizable (its property list contains a non-nil value | |
945 | of `standard-value' or `custom-autoload'), or | |
946 | \(3) it is an alias for another user variable. | |
947 | Return nil if VARIABLE is an alias and there is a loop in the | |
948 | chain of symbols. */) | |
9dbc9081 | 949 | (variable) |
db9f0278 JB |
950 | Lisp_Object variable; |
951 | { | |
952 | Lisp_Object documentation; | |
177c0ea7 | 953 | |
5e78e475 RS |
954 | if (!SYMBOLP (variable)) |
955 | return Qnil; | |
956 | ||
606cdb89 JB |
957 | /* If indirect and there's an alias loop, don't check anything else. */ |
958 | if (XSYMBOL (variable)->indirect_variable | |
959 | && NILP (internal_condition_case_1 (indirect_variable, variable, | |
960 | Qt, user_variable_p_eh))) | |
961 | return Qnil; | |
962 | ||
963 | while (1) | |
964 | { | |
965 | documentation = Fget (variable, Qvariable_documentation); | |
966 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
967 | return Qt; | |
968 | if (STRINGP (documentation) | |
969 | && ((unsigned char) SREF (documentation, 0) == '*')) | |
970 | return Qt; | |
971 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ | |
972 | if (CONSP (documentation) | |
973 | && STRINGP (XCAR (documentation)) | |
974 | && INTEGERP (XCDR (documentation)) | |
975 | && XINT (XCDR (documentation)) < 0) | |
976 | return Qt; | |
977 | /* Customizable? See `custom-variable-p'. */ | |
978 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
979 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) | |
980 | return Qt; | |
981 | ||
982 | if (!XSYMBOL (variable)->indirect_variable) | |
983 | return Qnil; | |
984 | ||
985 | /* An indirect variable? Let's follow the chain. */ | |
986 | variable = XSYMBOL (variable)->value; | |
987 | } | |
177c0ea7 | 988 | } |
db9f0278 JB |
989 | \f |
990 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
991 | doc: /* Bind variables according to VARLIST then eval BODY. |
992 | The value of the last form in BODY is returned. | |
993 | Each element of VARLIST is a symbol (which is bound to nil) | |
994 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
995 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 996 | usage: (let* VARLIST BODY...) */) |
9dbc9081 | 997 | (args) |
db9f0278 JB |
998 | Lisp_Object args; |
999 | { | |
1000 | Lisp_Object varlist, val, elt; | |
aed13378 | 1001 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
1002 | struct gcpro gcpro1, gcpro2, gcpro3; |
1003 | ||
1004 | GCPRO3 (args, elt, varlist); | |
1005 | ||
1006 | varlist = Fcar (args); | |
265a9e55 | 1007 | while (!NILP (varlist)) |
db9f0278 JB |
1008 | { |
1009 | QUIT; | |
1010 | elt = Fcar (varlist); | |
90165123 | 1011 | if (SYMBOLP (elt)) |
db9f0278 | 1012 | specbind (elt, Qnil); |
08564963 | 1013 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1014 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1015 | else |
1016 | { | |
1017 | val = Feval (Fcar (Fcdr (elt))); | |
1018 | specbind (Fcar (elt), val); | |
1019 | } | |
1020 | varlist = Fcdr (varlist); | |
1021 | } | |
1022 | UNGCPRO; | |
1023 | val = Fprogn (Fcdr (args)); | |
1024 | return unbind_to (count, val); | |
1025 | } | |
1026 | ||
1027 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1028 | doc: /* Bind variables according to VARLIST then eval BODY. |
1029 | The value of the last form in BODY is returned. | |
1030 | Each element of VARLIST is a symbol (which is bound to nil) | |
1031 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1032 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 1033 | usage: (let VARLIST BODY...) */) |
9dbc9081 | 1034 | (args) |
db9f0278 JB |
1035 | Lisp_Object args; |
1036 | { | |
1037 | Lisp_Object *temps, tem; | |
1038 | register Lisp_Object elt, varlist; | |
aed13378 | 1039 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
1040 | register int argnum; |
1041 | struct gcpro gcpro1, gcpro2; | |
1042 | ||
1043 | varlist = Fcar (args); | |
1044 | ||
1045 | /* Make space to hold the values to give the bound variables */ | |
1046 | elt = Flength (varlist); | |
1047 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
1048 | ||
1049 | /* Compute the values and store them in `temps' */ | |
1050 | ||
1051 | GCPRO2 (args, *temps); | |
1052 | gcpro2.nvars = 0; | |
1053 | ||
67ee9f6e | 1054 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
1055 | { |
1056 | QUIT; | |
67ee9f6e | 1057 | elt = XCAR (varlist); |
90165123 | 1058 | if (SYMBOLP (elt)) |
db9f0278 | 1059 | temps [argnum++] = Qnil; |
08564963 | 1060 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1061 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1062 | else |
1063 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
1064 | gcpro2.nvars = argnum; | |
1065 | } | |
1066 | UNGCPRO; | |
1067 | ||
1068 | varlist = Fcar (args); | |
67ee9f6e | 1069 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 1070 | { |
67ee9f6e | 1071 | elt = XCAR (varlist); |
db9f0278 | 1072 | tem = temps[argnum++]; |
90165123 | 1073 | if (SYMBOLP (elt)) |
db9f0278 JB |
1074 | specbind (elt, tem); |
1075 | else | |
1076 | specbind (Fcar (elt), tem); | |
1077 | } | |
1078 | ||
1079 | elt = Fprogn (Fcdr (args)); | |
1080 | return unbind_to (count, elt); | |
1081 | } | |
1082 | ||
1083 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1084 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1085 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1086 | until TEST returns nil. | |
7a25dc6d | 1087 | usage: (while TEST BODY...) */) |
9dbc9081 | 1088 | (args) |
db9f0278 JB |
1089 | Lisp_Object args; |
1090 | { | |
2b9bde76 | 1091 | Lisp_Object test, body; |
db9f0278 JB |
1092 | struct gcpro gcpro1, gcpro2; |
1093 | ||
1094 | GCPRO2 (test, body); | |
1095 | ||
1096 | test = Fcar (args); | |
1097 | body = Fcdr (args); | |
2b9bde76 | 1098 | while (!NILP (Feval (test))) |
db9f0278 JB |
1099 | { |
1100 | QUIT; | |
1101 | Fprogn (body); | |
1102 | } | |
1103 | ||
1104 | UNGCPRO; | |
1105 | return Qnil; | |
1106 | } | |
1107 | ||
1108 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1109 | doc: /* Return result of expanding macros at top level of FORM. |
1110 | If FORM is not a macro call, it is returned unchanged. | |
1111 | Otherwise, the macro is expanded and the expansion is considered | |
1112 | in place of FORM. When a non-macro-call results, it is returned. | |
1113 | ||
1114 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1115 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
1116 | (form, environment) | |
2e267a2e | 1117 | Lisp_Object form; |
79e8bfbf | 1118 | Lisp_Object environment; |
db9f0278 | 1119 | { |
23d6b5a6 | 1120 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1121 | register Lisp_Object expander, sym, def, tem; |
1122 | ||
1123 | while (1) | |
1124 | { | |
1125 | /* Come back here each time we expand a macro call, | |
1126 | in case it expands into another macro call. */ | |
90165123 | 1127 | if (!CONSP (form)) |
db9f0278 | 1128 | break; |
23d6b5a6 | 1129 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1130 | def = sym = XCAR (form); |
23d6b5a6 | 1131 | tem = Qnil; |
db9f0278 JB |
1132 | /* Trace symbols aliases to other symbols |
1133 | until we get a symbol that is not an alias. */ | |
90165123 | 1134 | while (SYMBOLP (def)) |
db9f0278 JB |
1135 | { |
1136 | QUIT; | |
23d6b5a6 | 1137 | sym = def; |
79e8bfbf | 1138 | tem = Fassq (sym, environment); |
265a9e55 | 1139 | if (NILP (tem)) |
db9f0278 JB |
1140 | { |
1141 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1142 | if (!EQ (def, Qunbound)) |
1143 | continue; | |
db9f0278 | 1144 | } |
23d6b5a6 | 1145 | break; |
db9f0278 | 1146 | } |
79e8bfbf | 1147 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1148 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1149 | if (NILP (tem)) |
db9f0278 | 1150 | { |
79e8bfbf | 1151 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1152 | Look at its function definition. */ |
90165123 | 1153 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
1154 | /* Not defined or definition not suitable */ |
1155 | break; | |
03699b14 | 1156 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1157 | { |
1158 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1159 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1160 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1161 | /* Yes, load it and try again. */ |
1162 | { | |
ca20916b RS |
1163 | struct gcpro gcpro1; |
1164 | GCPRO1 (form); | |
ee9ee63c | 1165 | do_autoload (def, sym); |
ca20916b | 1166 | UNGCPRO; |
ee9ee63c JB |
1167 | continue; |
1168 | } | |
1169 | else | |
db9f0278 | 1170 | break; |
db9f0278 | 1171 | } |
03699b14 | 1172 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1173 | break; |
03699b14 | 1174 | else expander = XCDR (def); |
db9f0278 JB |
1175 | } |
1176 | else | |
1177 | { | |
03699b14 | 1178 | expander = XCDR (tem); |
265a9e55 | 1179 | if (NILP (expander)) |
db9f0278 JB |
1180 | break; |
1181 | } | |
03699b14 | 1182 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1183 | } |
1184 | return form; | |
1185 | } | |
1186 | \f | |
1187 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1188 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1189 | TAG is evalled to get the tag to use; it must not be nil. | |
1190 | ||
1191 | Then the BODY is executed. | |
1d632ccf | 1192 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1193 | If no throw happens, `catch' returns the value of the last BODY form. |
1194 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1195 | usage: (catch TAG BODY...) */) |
9dbc9081 | 1196 | (args) |
db9f0278 JB |
1197 | Lisp_Object args; |
1198 | { | |
1199 | register Lisp_Object tag; | |
1200 | struct gcpro gcpro1; | |
1201 | ||
1202 | GCPRO1 (args); | |
1203 | tag = Feval (Fcar (args)); | |
1204 | UNGCPRO; | |
1205 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1206 | } | |
1207 | ||
1208 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1209 | FUNC should return a Lisp_Object. | |
1210 | This is how catches are done from within C code. */ | |
1211 | ||
1212 | Lisp_Object | |
1213 | internal_catch (tag, func, arg) | |
1214 | Lisp_Object tag; | |
1215 | Lisp_Object (*func) (); | |
1216 | Lisp_Object arg; | |
1217 | { | |
1218 | /* This structure is made part of the chain `catchlist'. */ | |
1219 | struct catchtag c; | |
1220 | ||
1221 | /* Fill in the components of c, and put it on the list. */ | |
1222 | c.next = catchlist; | |
1223 | c.tag = tag; | |
1224 | c.val = Qnil; | |
1225 | c.backlist = backtrace_list; | |
1226 | c.handlerlist = handlerlist; | |
1227 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1228 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1229 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1230 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1231 | c.gcpro = gcprolist; |
bcf28080 | 1232 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1233 | catchlist = &c; |
1234 | ||
1235 | /* Call FUNC. */ | |
1236 | if (! _setjmp (c.jmp)) | |
1237 | c.val = (*func) (arg); | |
1238 | ||
1239 | /* Throw works by a longjmp that comes right here. */ | |
1240 | catchlist = c.next; | |
1241 | return c.val; | |
1242 | } | |
1243 | ||
ba410f40 JB |
1244 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1245 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1246 | |
ba410f40 JB |
1247 | This is the guts Fthrow and Fsignal; they differ only in the way |
1248 | they choose the catch tag to throw to. A catch tag for a | |
1249 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1250 | |
ba410f40 JB |
1251 | Before each catch is discarded, unbind all special bindings and |
1252 | execute all unwind-protect clauses made above that catch. Unwind | |
1253 | the handler stack as we go, so that the proper handlers are in | |
1254 | effect for each unwind-protect clause we run. At the end, restore | |
1255 | some static info saved in CATCH, and longjmp to the location | |
1256 | specified in the | |
1257 | ||
1258 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1259 | |
1260 | static void | |
ba410f40 | 1261 | unwind_to_catch (catch, value) |
db9f0278 | 1262 | struct catchtag *catch; |
ba410f40 | 1263 | Lisp_Object value; |
db9f0278 JB |
1264 | { |
1265 | register int last_time; | |
1266 | ||
ba410f40 JB |
1267 | /* Save the value in the tag. */ |
1268 | catch->val = value; | |
1269 | ||
0b31741c | 1270 | /* Restore certain special C variables. */ |
1cdc3155 | 1271 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1272 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1273 | handling_signal = 0; |
69bbd6bd | 1274 | immediate_quit = 0; |
82da7701 | 1275 | |
db9f0278 JB |
1276 | do |
1277 | { | |
1278 | last_time = catchlist == catch; | |
82da7701 JB |
1279 | |
1280 | /* Unwind the specpdl stack, and then restore the proper set of | |
1281 | handlers. */ | |
db9f0278 JB |
1282 | unbind_to (catchlist->pdlcount, Qnil); |
1283 | handlerlist = catchlist->handlerlist; | |
1284 | catchlist = catchlist->next; | |
1285 | } | |
1286 | while (! last_time); | |
1287 | ||
a2a103bb | 1288 | #if HAVE_X_WINDOWS |
88019a63 RS |
1289 | /* If x_catch_errors was done, turn it off now. |
1290 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 KL |
1291 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
1292 | * The catch must remain in effect during that delicate | |
1293 | * state. --lorentey */ | |
88019a63 | 1294 | x_fully_uncatch_errors (); |
e6aee454 | 1295 | #endif |
a2a103bb | 1296 | #endif |
88019a63 | 1297 | |
bcf28080 | 1298 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1299 | gcprolist = catch->gcpro; |
15934ffa RS |
1300 | #ifdef DEBUG_GCPRO |
1301 | if (gcprolist != 0) | |
1302 | gcpro_level = gcprolist->level + 1; | |
1303 | else | |
1304 | gcpro_level = 0; | |
1305 | #endif | |
db9f0278 JB |
1306 | backtrace_list = catch->backlist; |
1307 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1308 | |
ba410f40 | 1309 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1310 | } |
1311 | ||
1312 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
9dbc9081 PJ |
1313 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1314 | Both TAG and VALUE are evalled. */) | |
1315 | (tag, value) | |
79e8bfbf | 1316 | register Lisp_Object tag, value; |
db9f0278 JB |
1317 | { |
1318 | register struct catchtag *c; | |
1319 | ||
8788120f KS |
1320 | if (!NILP (tag)) |
1321 | for (c = catchlist; c; c = c->next) | |
1322 | { | |
1323 | if (EQ (c->tag, tag)) | |
1324 | unwind_to_catch (c, value); | |
1325 | } | |
734d55a2 | 1326 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1327 | } |
1328 | ||
1329 | ||
1330 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1331 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1332 | If BODYFORM completes normally, its value is returned | |
1333 | after executing the UNWINDFORMS. | |
1334 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1335 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
9dbc9081 | 1336 | (args) |
db9f0278 JB |
1337 | Lisp_Object args; |
1338 | { | |
1339 | Lisp_Object val; | |
aed13378 | 1340 | int count = SPECPDL_INDEX (); |
db9f0278 | 1341 | |
04b28167 | 1342 | record_unwind_protect (Fprogn, Fcdr (args)); |
db9f0278 | 1343 | val = Feval (Fcar (args)); |
177c0ea7 | 1344 | return unbind_to (count, val); |
db9f0278 JB |
1345 | } |
1346 | \f | |
1347 | /* Chain of condition handlers currently in effect. | |
1348 | The elements of this chain are contained in the stack frames | |
1349 | of Fcondition_case and internal_condition_case. | |
1350 | When an error is signaled (by calling Fsignal, below), | |
1351 | this chain is searched for an element that applies. */ | |
1352 | ||
1353 | struct handler *handlerlist; | |
1354 | ||
1355 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
9dbc9081 | 1356 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1357 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1358 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1359 | where the BODY is made of Lisp expressions. | |
1360 | ||
1361 | A handler is applicable to an error | |
1362 | if CONDITION-NAME is one of the error's condition names. | |
1363 | If an error happens, the first applicable handler is run. | |
1364 | ||
1365 | The car of a handler may be a list of condition names | |
c997bb25 | 1366 | instead of a single condition name. Then it handles all of them. |
9dbc9081 | 1367 | |
c997bb25 RS |
1368 | When a handler handles an error, control returns to the `condition-case' |
1369 | and it executes the handler's BODY... | |
1370 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA) from the error. | |
1371 | (If VAR is nil, the handler can't access that information.) | |
1372 | Then the value of the last BODY form is returned from the `condition-case' | |
1373 | expression. | |
9dbc9081 | 1374 | |
9dbc9081 | 1375 | See also the function `signal' for more info. |
2b47b74d | 1376 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
9dbc9081 | 1377 | (args) |
db9f0278 JB |
1378 | Lisp_Object args; |
1379 | { | |
17401c97 GM |
1380 | register Lisp_Object bodyform, handlers; |
1381 | volatile Lisp_Object var; | |
db9f0278 | 1382 | |
82da7701 JB |
1383 | var = Fcar (args); |
1384 | bodyform = Fcar (Fcdr (args)); | |
1385 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1386 | |
1387 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1388 | } | |
1389 | ||
1390 | /* Like Fcondition_case, but the args are separate | |
1391 | rather than passed in a list. Used by Fbyte_code. */ | |
1392 | ||
1393 | Lisp_Object | |
1394 | internal_lisp_condition_case (var, bodyform, handlers) | |
1395 | volatile Lisp_Object var; | |
1396 | Lisp_Object bodyform, handlers; | |
1397 | { | |
1398 | Lisp_Object val; | |
1399 | struct catchtag c; | |
1400 | struct handler h; | |
1401 | ||
b7826503 | 1402 | CHECK_SYMBOL (var); |
82da7701 | 1403 | |
2b47b74d | 1404 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1405 | { |
1406 | Lisp_Object tem; | |
2b47b74d | 1407 | tem = XCAR (val); |
5f96776a RS |
1408 | if (! (NILP (tem) |
1409 | || (CONSP (tem) | |
03699b14 KR |
1410 | && (SYMBOLP (XCAR (tem)) |
1411 | || CONSP (XCAR (tem)))))) | |
82da7701 JB |
1412 | error ("Invalid condition handler", tem); |
1413 | } | |
db9f0278 JB |
1414 | |
1415 | c.tag = Qnil; | |
1416 | c.val = Qnil; | |
1417 | c.backlist = backtrace_list; | |
1418 | c.handlerlist = handlerlist; | |
1419 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1420 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1421 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1422 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1423 | c.gcpro = gcprolist; |
bcf28080 | 1424 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1425 | if (_setjmp (c.jmp)) |
1426 | { | |
265a9e55 | 1427 | if (!NILP (h.var)) |
9d58218c RS |
1428 | specbind (h.var, c.val); |
1429 | val = Fprogn (Fcdr (h.chosen_clause)); | |
82da7701 JB |
1430 | |
1431 | /* Note that this just undoes the binding of h.var; whoever | |
1432 | longjumped to us unwound the stack to c.pdlcount before | |
1433 | throwing. */ | |
db9f0278 JB |
1434 | unbind_to (c.pdlcount, Qnil); |
1435 | return val; | |
1436 | } | |
1437 | c.next = catchlist; | |
1438 | catchlist = &c; | |
177c0ea7 | 1439 | |
82da7701 JB |
1440 | h.var = var; |
1441 | h.handler = handlers; | |
db9f0278 | 1442 | h.next = handlerlist; |
db9f0278 JB |
1443 | h.tag = &c; |
1444 | handlerlist = &h; | |
1445 | ||
82da7701 | 1446 | val = Feval (bodyform); |
db9f0278 JB |
1447 | catchlist = c.next; |
1448 | handlerlist = h.next; | |
1449 | return val; | |
1450 | } | |
1451 | ||
f029ca5f RS |
1452 | /* Call the function BFUN with no arguments, catching errors within it |
1453 | according to HANDLERS. If there is an error, call HFUN with | |
1454 | one argument which is the data that describes the error: | |
1455 | (SIGNALNAME . DATA) | |
1456 | ||
1457 | HANDLERS can be a list of conditions to catch. | |
1458 | If HANDLERS is Qt, catch all errors. | |
1459 | If HANDLERS is Qerror, catch all errors | |
1460 | but allow the debugger to run if that is enabled. */ | |
1461 | ||
db9f0278 JB |
1462 | Lisp_Object |
1463 | internal_condition_case (bfun, handlers, hfun) | |
1464 | Lisp_Object (*bfun) (); | |
1465 | Lisp_Object handlers; | |
1466 | Lisp_Object (*hfun) (); | |
1467 | { | |
1468 | Lisp_Object val; | |
1469 | struct catchtag c; | |
1470 | struct handler h; | |
1471 | ||
88019a63 RS |
1472 | /* Since Fsignal will close off all calls to x_catch_errors, |
1473 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1474 | #if HAVE_X_WINDOWS |
88019a63 | 1475 | if (x_catching_errors ()) |
01591d17 | 1476 | abort (); |
a2a103bb | 1477 | #endif |
01591d17 | 1478 | |
db9f0278 JB |
1479 | c.tag = Qnil; |
1480 | c.val = Qnil; | |
1481 | c.backlist = backtrace_list; | |
1482 | c.handlerlist = handlerlist; | |
1483 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1484 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1485 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1486 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1487 | c.gcpro = gcprolist; |
bcf28080 | 1488 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1489 | if (_setjmp (c.jmp)) |
1490 | { | |
9d58218c | 1491 | return (*hfun) (c.val); |
db9f0278 JB |
1492 | } |
1493 | c.next = catchlist; | |
1494 | catchlist = &c; | |
1495 | h.handler = handlers; | |
1496 | h.var = Qnil; | |
db9f0278 JB |
1497 | h.next = handlerlist; |
1498 | h.tag = &c; | |
1499 | handlerlist = &h; | |
1500 | ||
1501 | val = (*bfun) (); | |
1502 | catchlist = c.next; | |
1503 | handlerlist = h.next; | |
1504 | return val; | |
1505 | } | |
1506 | ||
2659a09f | 1507 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1508 | |
d227775c RS |
1509 | Lisp_Object |
1510 | internal_condition_case_1 (bfun, arg, handlers, hfun) | |
1511 | Lisp_Object (*bfun) (); | |
1512 | Lisp_Object arg; | |
1513 | Lisp_Object handlers; | |
1514 | Lisp_Object (*hfun) (); | |
1515 | { | |
1516 | Lisp_Object val; | |
1517 | struct catchtag c; | |
1518 | struct handler h; | |
1519 | ||
88019a63 RS |
1520 | /* Since Fsignal will close off all calls to x_catch_errors, |
1521 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1522 | #if HAVE_X_WINDOWS |
88019a63 RS |
1523 | if (x_catching_errors ()) |
1524 | abort (); | |
a2a103bb | 1525 | #endif |
88019a63 | 1526 | |
d227775c RS |
1527 | c.tag = Qnil; |
1528 | c.val = Qnil; | |
1529 | c.backlist = backtrace_list; | |
1530 | c.handlerlist = handlerlist; | |
1531 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1532 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1533 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1534 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1535 | c.gcpro = gcprolist; |
bcf28080 | 1536 | c.byte_stack = byte_stack_list; |
d227775c RS |
1537 | if (_setjmp (c.jmp)) |
1538 | { | |
9d58218c | 1539 | return (*hfun) (c.val); |
d227775c RS |
1540 | } |
1541 | c.next = catchlist; | |
1542 | catchlist = &c; | |
1543 | h.handler = handlers; | |
1544 | h.var = Qnil; | |
1545 | h.next = handlerlist; | |
1546 | h.tag = &c; | |
1547 | handlerlist = &h; | |
1548 | ||
1549 | val = (*bfun) (arg); | |
1550 | catchlist = c.next; | |
1551 | handlerlist = h.next; | |
1552 | return val; | |
1553 | } | |
10b29d41 GM |
1554 | |
1555 | ||
2659a09f | 1556 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1557 | and ARGS as second argument. */ |
1558 | ||
1559 | Lisp_Object | |
1560 | internal_condition_case_2 (bfun, nargs, args, handlers, hfun) | |
1561 | Lisp_Object (*bfun) (); | |
1562 | int nargs; | |
1563 | Lisp_Object *args; | |
1564 | Lisp_Object handlers; | |
1565 | Lisp_Object (*hfun) (); | |
1566 | { | |
1567 | Lisp_Object val; | |
1568 | struct catchtag c; | |
1569 | struct handler h; | |
1570 | ||
88019a63 RS |
1571 | /* Since Fsignal will close off all calls to x_catch_errors, |
1572 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1573 | #if HAVE_X_WINDOWS |
88019a63 RS |
1574 | if (x_catching_errors ()) |
1575 | abort (); | |
a2a103bb | 1576 | #endif |
88019a63 | 1577 | |
10b29d41 GM |
1578 | c.tag = Qnil; |
1579 | c.val = Qnil; | |
1580 | c.backlist = backtrace_list; | |
1581 | c.handlerlist = handlerlist; | |
1582 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1583 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1584 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1585 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1586 | c.gcpro = gcprolist; |
1587 | c.byte_stack = byte_stack_list; | |
1588 | if (_setjmp (c.jmp)) | |
1589 | { | |
1590 | return (*hfun) (c.val); | |
1591 | } | |
1592 | c.next = catchlist; | |
1593 | catchlist = &c; | |
1594 | h.handler = handlers; | |
1595 | h.var = Qnil; | |
1596 | h.next = handlerlist; | |
1597 | h.tag = &c; | |
1598 | handlerlist = &h; | |
1599 | ||
1600 | val = (*bfun) (nargs, args); | |
1601 | catchlist = c.next; | |
1602 | handlerlist = h.next; | |
1603 | return val; | |
1604 | } | |
1605 | ||
d227775c | 1606 | \f |
2901f1d1 | 1607 | static Lisp_Object find_handler_clause P_ ((Lisp_Object, Lisp_Object, |
f01cbfdd | 1608 | Lisp_Object, Lisp_Object)); |
db9f0278 JB |
1609 | |
1610 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
9dbc9081 PJ |
1611 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1612 | This function does not return. | |
1613 | ||
1614 | An error symbol is a symbol with an `error-conditions' property | |
1615 | that is a list of condition names. | |
1616 | A handler for any of those names will get to handle this signal. | |
1617 | The symbol `error' should normally be one of them. | |
1618 | ||
1619 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1620 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1621 | error message is constructed. | |
9dbc9081 PJ |
1622 | If the signal is handled, DATA is made available to the handler. |
1623 | See also the function `condition-case'. */) | |
1624 | (error_symbol, data) | |
4200e719 | 1625 | Lisp_Object error_symbol, data; |
db9f0278 | 1626 | { |
bfa8ca43 | 1627 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1628 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1629 | That is a special case--don't do this in other situations. */ | |
db9f0278 JB |
1630 | register struct handler *allhandlers = handlerlist; |
1631 | Lisp_Object conditions; | |
1632 | extern int gc_in_progress; | |
1633 | extern int waiting_for_input; | |
c11d3d17 | 1634 | Lisp_Object string; |
1ea9dec4 | 1635 | Lisp_Object real_error_symbol; |
a2ff3819 | 1636 | struct backtrace *bp; |
db9f0278 | 1637 | |
346598f1 | 1638 | immediate_quit = handling_signal = 0; |
d063129f | 1639 | abort_on_gc = 0; |
db9f0278 JB |
1640 | if (gc_in_progress || waiting_for_input) |
1641 | abort (); | |
1642 | ||
1ea9dec4 RS |
1643 | if (NILP (error_symbol)) |
1644 | real_error_symbol = Fcar (data); | |
1645 | else | |
1646 | real_error_symbol = error_symbol; | |
1647 | ||
26631f2b RS |
1648 | #if 0 /* rms: I don't know why this was here, |
1649 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1650 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1651 | if (display_hourglass_p) |
1652 | cancel_hourglass (); | |
48f8dfa3 | 1653 | #endif |
177c0ea7 | 1654 | #endif |
48f8dfa3 | 1655 | |
61ede770 | 1656 | /* This hook is used by edebug. */ |
26631f2b RS |
1657 | if (! NILP (Vsignal_hook_function) |
1658 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1659 | { |
1660 | /* Edebug takes care of restoring these variables when it exits. */ | |
1661 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1662 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1663 | ||
1664 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1665 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1666 | ||
1667 | call2 (Vsignal_hook_function, error_symbol, data); | |
1668 | } | |
61ede770 | 1669 | |
1ea9dec4 | 1670 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1671 | |
a2ff3819 GM |
1672 | /* Remember from where signal was called. Skip over the frame for |
1673 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1674 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1675 | is a memory-full error. */ | |
090a072f | 1676 | Vsignaling_function = Qnil; |
26631f2b | 1677 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1678 | { |
1679 | bp = backtrace_list->next; | |
1680 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1681 | bp = bp->next; | |
1682 | if (bp && bp->function) | |
1683 | Vsignaling_function = *bp->function; | |
1684 | } | |
a2ff3819 | 1685 | |
db9f0278 JB |
1686 | for (; handlerlist; handlerlist = handlerlist->next) |
1687 | { | |
1688 | register Lisp_Object clause; | |
177c0ea7 | 1689 | |
db9f0278 | 1690 | clause = find_handler_clause (handlerlist->handler, conditions, |
f01cbfdd | 1691 | error_symbol, data); |
db9f0278 | 1692 | |
db9f0278 | 1693 | if (EQ (clause, Qlambda)) |
82da7701 | 1694 | { |
690337b7 KH |
1695 | /* We can't return values to code which signaled an error, but we |
1696 | can continue code which has signaled a quit. */ | |
1ea9dec4 | 1697 | if (EQ (real_error_symbol, Qquit)) |
82da7701 JB |
1698 | return Qnil; |
1699 | else | |
d3e6f8be | 1700 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1701 | } |
db9f0278 | 1702 | |
265a9e55 | 1703 | if (!NILP (clause)) |
db9f0278 | 1704 | { |
9d58218c | 1705 | Lisp_Object unwind_data; |
db9f0278 | 1706 | struct handler *h = handlerlist; |
9d58218c | 1707 | |
db9f0278 | 1708 | handlerlist = allhandlers; |
1ea9dec4 RS |
1709 | |
1710 | if (NILP (error_symbol)) | |
1711 | unwind_data = data; | |
9d58218c RS |
1712 | else |
1713 | unwind_data = Fcons (error_symbol, data); | |
1714 | h->chosen_clause = clause; | |
1715 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1716 | } |
1717 | } | |
1718 | ||
1719 | handlerlist = allhandlers; | |
1720 | /* If no handler is present now, try to run the debugger, | |
1721 | and if that fails, throw to top level. */ | |
f01cbfdd | 1722 | find_handler_clause (Qerror, conditions, error_symbol, data); |
c11d3d17 RS |
1723 | if (catchlist != 0) |
1724 | Fthrow (Qtop_level, Qt); | |
1725 | ||
1ea9dec4 | 1726 | if (! NILP (error_symbol)) |
c11d3d17 RS |
1727 | data = Fcons (error_symbol, data); |
1728 | ||
1729 | string = Ferror_message_string (data); | |
d5db4077 | 1730 | fatal ("%s", SDATA (string), 0); |
db9f0278 JB |
1731 | } |
1732 | ||
734d55a2 KS |
1733 | /* Internal version of Fsignal that never returns. |
1734 | Used for anything but Qquit (which can return from Fsignal). */ | |
1735 | ||
1736 | void | |
1737 | xsignal (error_symbol, data) | |
1738 | Lisp_Object error_symbol, data; | |
1739 | { | |
1740 | Fsignal (error_symbol, data); | |
1741 | abort (); | |
1742 | } | |
1743 | ||
1744 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1745 | ||
1746 | void | |
1747 | xsignal0 (error_symbol) | |
1748 | Lisp_Object error_symbol; | |
1749 | { | |
1750 | xsignal (error_symbol, Qnil); | |
1751 | } | |
1752 | ||
1753 | void | |
1754 | xsignal1 (error_symbol, arg) | |
1755 | Lisp_Object error_symbol, arg; | |
1756 | { | |
1757 | xsignal (error_symbol, list1 (arg)); | |
1758 | } | |
1759 | ||
1760 | void | |
1761 | xsignal2 (error_symbol, arg1, arg2) | |
1762 | Lisp_Object error_symbol, arg1, arg2; | |
1763 | { | |
1764 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1765 | } | |
1766 | ||
1767 | void | |
1768 | xsignal3 (error_symbol, arg1, arg2, arg3) | |
1769 | Lisp_Object error_symbol, arg1, arg2, arg3; | |
1770 | { | |
1771 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1772 | } | |
1773 | ||
1774 | /* Signal `error' with message S, and additional arg ARG. | |
1775 | If ARG is not a genuine list, make it a one-element list. */ | |
1776 | ||
1777 | void | |
1778 | signal_error (s, arg) | |
1779 | char *s; | |
1780 | Lisp_Object arg; | |
1781 | { | |
1782 | Lisp_Object tortoise, hare; | |
1783 | ||
1784 | hare = tortoise = arg; | |
1785 | while (CONSP (hare)) | |
1786 | { | |
1787 | hare = XCDR (hare); | |
1788 | if (!CONSP (hare)) | |
1789 | break; | |
1790 | ||
1791 | hare = XCDR (hare); | |
1792 | tortoise = XCDR (tortoise); | |
1793 | ||
1794 | if (EQ (hare, tortoise)) | |
1795 | break; | |
1796 | } | |
1797 | ||
1798 | if (!NILP (hare)) | |
1799 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1800 | ||
1801 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1802 | } | |
1803 | ||
1804 | ||
e0f24100 | 1805 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1806 | a list containing one of CONDITIONS. */ |
1807 | ||
1808 | static int | |
1809 | wants_debugger (list, conditions) | |
1810 | Lisp_Object list, conditions; | |
1811 | { | |
4de86b16 | 1812 | if (NILP (list)) |
128c0f66 RM |
1813 | return 0; |
1814 | if (! CONSP (list)) | |
1815 | return 1; | |
1816 | ||
ab67260b | 1817 | while (CONSP (conditions)) |
128c0f66 | 1818 | { |
ab67260b | 1819 | Lisp_Object this, tail; |
03699b14 KR |
1820 | this = XCAR (conditions); |
1821 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1822 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1823 | return 1; |
03699b14 | 1824 | conditions = XCDR (conditions); |
128c0f66 | 1825 | } |
ab67260b | 1826 | return 0; |
128c0f66 RM |
1827 | } |
1828 | ||
fc950e09 KH |
1829 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1830 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1831 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1832 | |
1833 | static int | |
1834 | skip_debugger (conditions, data) | |
1835 | Lisp_Object conditions, data; | |
1836 | { | |
1837 | Lisp_Object tail; | |
1838 | int first_string = 1; | |
1839 | Lisp_Object error_message; | |
1840 | ||
17401c97 GM |
1841 | error_message = Qnil; |
1842 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1843 | { |
03699b14 | 1844 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1845 | { |
1846 | if (first_string) | |
1847 | { | |
1848 | error_message = Ferror_message_string (data); | |
1849 | first_string = 0; | |
1850 | } | |
177c0ea7 | 1851 | |
03699b14 | 1852 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1853 | return 1; |
1854 | } | |
1855 | else | |
1856 | { | |
1857 | Lisp_Object contail; | |
1858 | ||
17401c97 | 1859 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1860 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1861 | return 1; |
1862 | } | |
1863 | } | |
1864 | ||
1865 | return 0; | |
1866 | } | |
1867 | ||
128c0f66 | 1868 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1869 | There are two ways to pass SIG and DATA: |
9b942ebd | 1870 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1871 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1872 | This is for memory-full errors only. |
1ea9dec4 | 1873 | |
9f5903bb RS |
1874 | We need to increase max_specpdl_size temporarily around |
1875 | anything we do that can push on the specpdl, so as not to get | |
1876 | a second error here in case we're handling specpdl overflow. */ | |
db9f0278 JB |
1877 | |
1878 | static Lisp_Object | |
f01cbfdd | 1879 | find_handler_clause (handlers, conditions, sig, data) |
db9f0278 | 1880 | Lisp_Object handlers, conditions, sig, data; |
db9f0278 JB |
1881 | { |
1882 | register Lisp_Object h; | |
1883 | register Lisp_Object tem; | |
f01cbfdd RS |
1884 | int debugger_called = 0; |
1885 | int debugger_considered = 0; | |
db9f0278 | 1886 | |
f01cbfdd RS |
1887 | /* t is used by handlers for all conditions, set up by C code. */ |
1888 | if (EQ (handlers, Qt)) | |
db9f0278 | 1889 | return Qt; |
f01cbfdd RS |
1890 | |
1891 | /* Don't run the debugger for a memory-full error. | |
1892 | (There is no room in memory to do that!) */ | |
1893 | if (NILP (sig)) | |
1894 | debugger_considered = 1; | |
1895 | ||
61ede770 RS |
1896 | /* error is used similarly, but means print an error message |
1897 | and run the debugger if that is enabled. */ | |
1898 | if (EQ (handlers, Qerror) | |
57a6e758 RS |
1899 | || !NILP (Vdebug_on_signal)) /* This says call debugger even if |
1900 | there is a handler. */ | |
db9f0278 | 1901 | { |
f01cbfdd | 1902 | if (!NILP (sig) && wants_debugger (Vstack_trace_on_error, conditions)) |
88817f3b | 1903 | { |
9f5903bb | 1904 | max_specpdl_size++; |
f01cbfdd | 1905 | #ifdef PROTOTYPES |
88817f3b RS |
1906 | internal_with_output_to_temp_buffer ("*Backtrace*", |
1907 | (Lisp_Object (*) (Lisp_Object)) Fbacktrace, | |
1908 | Qnil); | |
f01cbfdd | 1909 | #else |
88817f3b RS |
1910 | internal_with_output_to_temp_buffer ("*Backtrace*", |
1911 | Fbacktrace, Qnil); | |
f01cbfdd | 1912 | #endif |
9f5903bb | 1913 | max_specpdl_size--; |
88817f3b | 1914 | } |
f01cbfdd RS |
1915 | |
1916 | if (!debugger_considered) | |
db9f0278 | 1917 | { |
f01cbfdd RS |
1918 | debugger_considered = 1; |
1919 | debugger_called = maybe_call_debugger (conditions, sig, data); | |
61ede770 | 1920 | } |
f01cbfdd | 1921 | |
61ede770 RS |
1922 | /* If there is no handler, return saying whether we ran the debugger. */ |
1923 | if (EQ (handlers, Qerror)) | |
1924 | { | |
1925 | if (debugger_called) | |
9f5903bb | 1926 | return Qlambda; |
61ede770 | 1927 | return Qt; |
db9f0278 | 1928 | } |
db9f0278 | 1929 | } |
f01cbfdd | 1930 | |
db9f0278 JB |
1931 | for (h = handlers; CONSP (h); h = Fcdr (h)) |
1932 | { | |
5f96776a RS |
1933 | Lisp_Object handler, condit; |
1934 | ||
1935 | handler = Fcar (h); | |
1936 | if (!CONSP (handler)) | |
db9f0278 | 1937 | continue; |
5f96776a RS |
1938 | condit = Fcar (handler); |
1939 | /* Handle a single condition name in handler HANDLER. */ | |
1940 | if (SYMBOLP (condit)) | |
1941 | { | |
1942 | tem = Fmemq (Fcar (handler), conditions); | |
1943 | if (!NILP (tem)) | |
1944 | return handler; | |
1945 | } | |
1946 | /* Handle a list of condition names in handler HANDLER. */ | |
1947 | else if (CONSP (condit)) | |
1948 | { | |
f01cbfdd RS |
1949 | Lisp_Object tail; |
1950 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1951 | { |
f01cbfdd | 1952 | tem = Fmemq (Fcar (tail), conditions); |
5f96776a | 1953 | if (!NILP (tem)) |
f01cbfdd RS |
1954 | { |
1955 | /* This handler is going to apply. | |
1956 | Does it allow the debugger to run first? */ | |
1957 | if (! debugger_considered && !NILP (Fmemq (Qdebug, condit))) | |
1958 | maybe_call_debugger (conditions, sig, data); | |
1959 | return handler; | |
1960 | } | |
5f96776a RS |
1961 | } |
1962 | } | |
db9f0278 | 1963 | } |
f01cbfdd | 1964 | |
db9f0278 JB |
1965 | return Qnil; |
1966 | } | |
1967 | ||
f01cbfdd RS |
1968 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
1969 | SIG and DATA describe the signal, as in find_handler_clause. */ | |
1970 | ||
1971 | int | |
1972 | maybe_call_debugger (conditions, sig, data) | |
1973 | Lisp_Object conditions, sig, data; | |
1974 | { | |
1975 | Lisp_Object combined_data; | |
1976 | ||
1977 | combined_data = Fcons (sig, data); | |
1978 | ||
1979 | if ( | |
1980 | /* Don't try to run the debugger with interrupts blocked. | |
1981 | The editing loop would return anyway. */ | |
1982 | ! INPUT_BLOCKED_P | |
1983 | /* Does user wants to enter debugger for this kind of error? */ | |
1984 | && (EQ (sig, Qquit) | |
1985 | ? debug_on_quit | |
1986 | : wants_debugger (Vdebug_on_error, conditions)) | |
1987 | && ! skip_debugger (conditions, combined_data) | |
1988 | /* rms: what's this for? */ | |
1989 | && when_entered_debugger < num_nonmacro_input_events) | |
1990 | { | |
1991 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1992 | return 1; | |
1993 | } | |
1994 | ||
1995 | return 0; | |
1996 | } | |
1997 | ||
db9f0278 JB |
1998 | /* dump an error message; called like printf */ |
1999 | ||
2000 | /* VARARGS 1 */ | |
2001 | void | |
2002 | error (m, a1, a2, a3) | |
2003 | char *m; | |
9125da08 | 2004 | char *a1, *a2, *a3; |
db9f0278 JB |
2005 | { |
2006 | char buf[200]; | |
9125da08 RS |
2007 | int size = 200; |
2008 | int mlen; | |
2009 | char *buffer = buf; | |
2010 | char *args[3]; | |
2011 | int allocated = 0; | |
2012 | Lisp_Object string; | |
2013 | ||
2014 | args[0] = a1; | |
2015 | args[1] = a2; | |
2016 | args[2] = a3; | |
2017 | ||
2018 | mlen = strlen (m); | |
db9f0278 JB |
2019 | |
2020 | while (1) | |
9125da08 | 2021 | { |
955f3ff9 | 2022 | int used = doprnt (buffer, size, m, m + mlen, 3, args); |
9125da08 RS |
2023 | if (used < size) |
2024 | break; | |
2025 | size *= 2; | |
2026 | if (allocated) | |
2027 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
2028 | else |
2029 | { | |
2030 | buffer = (char *) xmalloc (size); | |
2031 | allocated = 1; | |
2032 | } | |
9125da08 RS |
2033 | } |
2034 | ||
955f3ff9 | 2035 | string = build_string (buffer); |
9125da08 | 2036 | if (allocated) |
9ae6734f | 2037 | xfree (buffer); |
9125da08 | 2038 | |
734d55a2 | 2039 | xsignal1 (Qerror, string); |
db9f0278 JB |
2040 | } |
2041 | \f | |
e72706be | 2042 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
2043 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
2044 | This means it contains a description for how to read arguments to give it. | |
2045 | The value is nil for an invalid function or a symbol with no function | |
2046 | definition. | |
2047 | ||
2048 | Interactively callable functions include strings and vectors (treated | |
2049 | as keyboard macros), lambda-expressions that contain a top-level call | |
2050 | to `interactive', autoload definitions made by `autoload' with non-nil | |
2051 | fourth argument, and some of the built-in functions of Lisp. | |
2052 | ||
e72706be RS |
2053 | Also, a symbol satisfies `commandp' if its function definition does so. |
2054 | ||
2055 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2056 | then strings and vectors are not accepted. */) |
e72706be RS |
2057 | (function, for_call_interactively) |
2058 | Lisp_Object function, for_call_interactively; | |
db9f0278 JB |
2059 | { |
2060 | register Lisp_Object fun; | |
2061 | register Lisp_Object funcar; | |
52b71f49 | 2062 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2063 | |
2064 | fun = function; | |
2065 | ||
52b71f49 SM |
2066 | fun = indirect_function (fun); /* Check cycles. */ |
2067 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2068 | return Qnil; |
db9f0278 | 2069 | |
52b71f49 SM |
2070 | /* Check an `interactive-form' property if present, analogous to the |
2071 | function-documentation property. */ | |
2072 | fun = function; | |
2073 | while (SYMBOLP (fun)) | |
2074 | { | |
2075 | Lisp_Object tmp = Fget (fun, intern ("interactive-form")); | |
2076 | if (!NILP (tmp)) | |
2077 | if_prop = Qt; | |
2078 | fun = Fsymbol_function (fun); | |
2079 | } | |
2080 | ||
db9f0278 JB |
2081 | /* Emacs primitives are interactive if their DEFUN specifies an |
2082 | interactive spec. */ | |
90165123 | 2083 | if (SUBRP (fun)) |
04724b69 | 2084 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2085 | |
2086 | /* Bytecode objects are interactive if they are long enough to | |
2087 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2088 | where the interactive spec is stored. */ | |
90165123 | 2089 | else if (COMPILEDP (fun)) |
845975f5 | 2090 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2091 | ? Qt : if_prop); |
db9f0278 JB |
2092 | |
2093 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2094 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2095 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2096 | |
2097 | /* Lists may represent commands. */ | |
2098 | if (!CONSP (fun)) | |
2099 | return Qnil; | |
ed16fb98 | 2100 | funcar = XCAR (fun); |
db9f0278 | 2101 | if (EQ (funcar, Qlambda)) |
52b71f49 | 2102 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
db9f0278 | 2103 | if (EQ (funcar, Qautoload)) |
52b71f49 | 2104 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2105 | else |
2106 | return Qnil; | |
2107 | } | |
2108 | ||
2109 | /* ARGSUSED */ | |
2110 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, | |
9dbc9081 PJ |
2111 | doc: /* Define FUNCTION to autoload from FILE. |
2112 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2113 | Third arg DOCSTRING is documentation for the function. | |
2114 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2115 | Fifth arg TYPE indicates the type of the object: | |
2116 | nil or omitted says FUNCTION is a function, | |
2117 | `keymap' says FUNCTION is really a keymap, and | |
2118 | `macro' or t says FUNCTION is really a macro. | |
2119 | Third through fifth args give info about the real definition. | |
2120 | They default to nil. | |
2121 | If FUNCTION is already defined other than as an autoload, | |
2122 | this does nothing and returns nil. */) | |
2123 | (function, file, docstring, interactive, type) | |
ee9ee63c | 2124 | Lisp_Object function, file, docstring, interactive, type; |
db9f0278 JB |
2125 | { |
2126 | #ifdef NO_ARG_ARRAY | |
2127 | Lisp_Object args[4]; | |
2128 | #endif | |
2129 | ||
b7826503 PJ |
2130 | CHECK_SYMBOL (function); |
2131 | CHECK_STRING (file); | |
db9f0278 JB |
2132 | |
2133 | /* If function is defined and not as an autoload, don't override */ | |
2134 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 2135 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2136 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2137 | return Qnil; |
2138 | ||
7973e637 SM |
2139 | if (NILP (Vpurify_flag)) |
2140 | /* Only add entries after dumping, because the ones before are | |
2141 | not useful and else we get loads of them from the loaddefs.el. */ | |
2142 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
2143 | ||
db9f0278 JB |
2144 | #ifdef NO_ARG_ARRAY |
2145 | args[0] = file; | |
2146 | args[1] = docstring; | |
2147 | args[2] = interactive; | |
ee9ee63c | 2148 | args[3] = type; |
db9f0278 JB |
2149 | |
2150 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); | |
2151 | #else /* NO_ARG_ARRAY */ | |
2152 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); | |
2153 | #endif /* not NO_ARG_ARRAY */ | |
2154 | } | |
2155 | ||
2156 | Lisp_Object | |
2157 | un_autoload (oldqueue) | |
2158 | Lisp_Object oldqueue; | |
2159 | { | |
2160 | register Lisp_Object queue, first, second; | |
2161 | ||
2162 | /* Queue to unwind is current value of Vautoload_queue. | |
2163 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2164 | queue = Vautoload_queue; | |
2165 | Vautoload_queue = oldqueue; | |
2166 | while (CONSP (queue)) | |
2167 | { | |
e509f168 | 2168 | first = XCAR (queue); |
db9f0278 JB |
2169 | second = Fcdr (first); |
2170 | first = Fcar (first); | |
47b82df9 RS |
2171 | if (EQ (first, make_number (0))) |
2172 | Vfeatures = second; | |
db9f0278 JB |
2173 | else |
2174 | Ffset (first, second); | |
e509f168 | 2175 | queue = XCDR (queue); |
db9f0278 JB |
2176 | } |
2177 | return Qnil; | |
2178 | } | |
2179 | ||
ca20916b RS |
2180 | /* Load an autoloaded function. |
2181 | FUNNAME is the symbol which is the function's name. | |
2182 | FUNDEF is the autoload definition (a list). */ | |
2183 | ||
045ba794 | 2184 | void |
db9f0278 JB |
2185 | do_autoload (fundef, funname) |
2186 | Lisp_Object fundef, funname; | |
2187 | { | |
aed13378 | 2188 | int count = SPECPDL_INDEX (); |
d945992e | 2189 | Lisp_Object fun; |
ca20916b | 2190 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2191 | |
aea6173f RS |
2192 | /* This is to make sure that loadup.el gives a clear picture |
2193 | of what files are preloaded and when. */ | |
ab4db096 RS |
2194 | if (! NILP (Vpurify_flag)) |
2195 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2196 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2197 | |
db9f0278 | 2198 | fun = funname; |
b7826503 | 2199 | CHECK_SYMBOL (funname); |
ca20916b | 2200 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2201 | |
f87740dc | 2202 | /* Preserve the match data. */ |
89f2614d | 2203 | record_unwind_save_match_data (); |
177c0ea7 | 2204 | |
a04ee161 RS |
2205 | /* If autoloading gets an error (which includes the error of failing |
2206 | to define the function being called), we use Vautoload_queue | |
2207 | to undo function definitions and `provide' calls made by | |
2208 | the function. We do this in the specific case of autoloading | |
2209 | because autoloading is not an explicit request "load this file", | |
2210 | but rather a request to "call this function". | |
2211 | ||
2212 | The value saved here is to be restored into Vautoload_queue. */ | |
db9f0278 JB |
2213 | record_unwind_protect (un_autoload, Vautoload_queue); |
2214 | Vautoload_queue = Qt; | |
7351b242 | 2215 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2216 | |
db9f0278 JB |
2217 | /* Once loading finishes, don't undo it. */ |
2218 | Vautoload_queue = Qt; | |
2219 | unbind_to (count, Qnil); | |
2220 | ||
a7f96a35 | 2221 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2222 | |
76c2b0cc | 2223 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2224 | error ("Autoloading failed to define function %s", |
d5db4077 | 2225 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2226 | UNGCPRO; |
db9f0278 | 2227 | } |
4c576a83 | 2228 | |
db9f0278 JB |
2229 | \f |
2230 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
9dbc9081 PJ |
2231 | doc: /* Evaluate FORM and return its value. */) |
2232 | (form) | |
db9f0278 JB |
2233 | Lisp_Object form; |
2234 | { | |
2235 | Lisp_Object fun, val, original_fun, original_args; | |
2236 | Lisp_Object funcar; | |
2237 | struct backtrace backtrace; | |
2238 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2239 | ||
df470e3b | 2240 | if (handling_signal) |
48f8dfa3 | 2241 | abort (); |
177c0ea7 | 2242 | |
90165123 | 2243 | if (SYMBOLP (form)) |
2b9bde76 | 2244 | return Fsymbol_value (form); |
db9f0278 JB |
2245 | if (!CONSP (form)) |
2246 | return form; | |
2247 | ||
2248 | QUIT; | |
ee830945 RS |
2249 | if ((consing_since_gc > gc_cons_threshold |
2250 | && consing_since_gc > gc_relative_threshold) | |
2251 | || | |
2252 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2253 | { |
2254 | GCPRO1 (form); | |
2255 | Fgarbage_collect (); | |
2256 | UNGCPRO; | |
2257 | } | |
2258 | ||
2259 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2260 | { | |
2261 | if (max_lisp_eval_depth < 100) | |
2262 | max_lisp_eval_depth = 100; | |
2263 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2264 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2265 | } |
2266 | ||
2267 | original_fun = Fcar (form); | |
2268 | original_args = Fcdr (form); | |
2269 | ||
2270 | backtrace.next = backtrace_list; | |
2271 | backtrace_list = &backtrace; | |
2272 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
2273 | backtrace.args = &original_args; | |
2274 | backtrace.nargs = UNEVALLED; | |
2275 | backtrace.evalargs = 1; | |
2276 | backtrace.debug_on_exit = 0; | |
2277 | ||
2278 | if (debug_on_next_call) | |
2279 | do_debug_on_call (Qt); | |
2280 | ||
2281 | /* At this point, only original_fun and original_args | |
2282 | have values that will be used below */ | |
2283 | retry: | |
8788120f KS |
2284 | |
2285 | /* Optimize for no indirection. */ | |
2286 | fun = original_fun; | |
2287 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2288 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2289 | fun = indirect_function (fun); | |
db9f0278 | 2290 | |
90165123 | 2291 | if (SUBRP (fun)) |
db9f0278 JB |
2292 | { |
2293 | Lisp_Object numargs; | |
166c822d | 2294 | Lisp_Object argvals[8]; |
db9f0278 JB |
2295 | Lisp_Object args_left; |
2296 | register int i, maxargs; | |
2297 | ||
2298 | args_left = original_args; | |
2299 | numargs = Flength (args_left); | |
2300 | ||
c1788fbc RS |
2301 | CHECK_CONS_LIST (); |
2302 | ||
db9f0278 JB |
2303 | if (XINT (numargs) < XSUBR (fun)->min_args || |
2304 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2305 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 JB |
2306 | |
2307 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2308 | { | |
2309 | backtrace.evalargs = 0; | |
2310 | val = (*XSUBR (fun)->function) (args_left); | |
2311 | goto done; | |
2312 | } | |
2313 | ||
2314 | if (XSUBR (fun)->max_args == MANY) | |
2315 | { | |
2316 | /* Pass a vector of evaluated arguments */ | |
2317 | Lisp_Object *vals; | |
2318 | register int argnum = 0; | |
2319 | ||
2320 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
2321 | ||
2322 | GCPRO3 (args_left, fun, fun); | |
2323 | gcpro3.var = vals; | |
2324 | gcpro3.nvars = 0; | |
2325 | ||
265a9e55 | 2326 | while (!NILP (args_left)) |
db9f0278 JB |
2327 | { |
2328 | vals[argnum++] = Feval (Fcar (args_left)); | |
2329 | args_left = Fcdr (args_left); | |
2330 | gcpro3.nvars = argnum; | |
2331 | } | |
db9f0278 JB |
2332 | |
2333 | backtrace.args = vals; | |
2334 | backtrace.nargs = XINT (numargs); | |
2335 | ||
2336 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 2337 | UNGCPRO; |
db9f0278 JB |
2338 | goto done; |
2339 | } | |
2340 | ||
2341 | GCPRO3 (args_left, fun, fun); | |
2342 | gcpro3.var = argvals; | |
2343 | gcpro3.nvars = 0; | |
2344 | ||
2345 | maxargs = XSUBR (fun)->max_args; | |
2346 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2347 | { | |
2348 | argvals[i] = Feval (Fcar (args_left)); | |
2349 | gcpro3.nvars = ++i; | |
2350 | } | |
2351 | ||
2352 | UNGCPRO; | |
2353 | ||
2354 | backtrace.args = argvals; | |
2355 | backtrace.nargs = XINT (numargs); | |
2356 | ||
2357 | switch (i) | |
2358 | { | |
2359 | case 0: | |
2360 | val = (*XSUBR (fun)->function) (); | |
2361 | goto done; | |
2362 | case 1: | |
2363 | val = (*XSUBR (fun)->function) (argvals[0]); | |
2364 | goto done; | |
2365 | case 2: | |
2366 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
2367 | goto done; | |
2368 | case 3: | |
2369 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2370 | argvals[2]); | |
2371 | goto done; | |
2372 | case 4: | |
2373 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2374 | argvals[2], argvals[3]); | |
2375 | goto done; | |
2376 | case 5: | |
2377 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2378 | argvals[3], argvals[4]); | |
2379 | goto done; | |
2380 | case 6: | |
2381 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2382 | argvals[3], argvals[4], argvals[5]); | |
2383 | goto done; | |
15c65264 RS |
2384 | case 7: |
2385 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2386 | argvals[3], argvals[4], argvals[5], | |
2387 | argvals[6]); | |
2388 | goto done; | |
db9f0278 | 2389 | |
166c822d KH |
2390 | case 8: |
2391 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2392 | argvals[3], argvals[4], argvals[5], | |
2393 | argvals[6], argvals[7]); | |
2394 | goto done; | |
2395 | ||
db9f0278 | 2396 | default: |
08564963 JB |
2397 | /* Someone has created a subr that takes more arguments than |
2398 | is supported by this code. We need to either rewrite the | |
2399 | subr to use a different argument protocol, or add more | |
2400 | cases to this switch. */ | |
2401 | abort (); | |
db9f0278 JB |
2402 | } |
2403 | } | |
90165123 | 2404 | if (COMPILEDP (fun)) |
db9f0278 JB |
2405 | val = apply_lambda (fun, original_args, 1); |
2406 | else | |
2407 | { | |
8788120f | 2408 | if (EQ (fun, Qunbound)) |
734d55a2 | 2409 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2410 | if (!CONSP (fun)) |
734d55a2 KS |
2411 | xsignal1 (Qinvalid_function, original_fun); |
2412 | funcar = XCAR (fun); | |
90165123 | 2413 | if (!SYMBOLP (funcar)) |
734d55a2 | 2414 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2415 | if (EQ (funcar, Qautoload)) |
2416 | { | |
2417 | do_autoload (fun, original_fun); | |
2418 | goto retry; | |
2419 | } | |
2420 | if (EQ (funcar, Qmacro)) | |
2421 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
2422 | else if (EQ (funcar, Qlambda)) | |
2423 | val = apply_lambda (fun, original_args, 1); | |
db9f0278 | 2424 | else |
734d55a2 | 2425 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2426 | } |
2427 | done: | |
c1788fbc RS |
2428 | CHECK_CONS_LIST (); |
2429 | ||
db9f0278 JB |
2430 | lisp_eval_depth--; |
2431 | if (backtrace.debug_on_exit) | |
2432 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2433 | backtrace_list = backtrace.next; | |
824eb35e | 2434 | |
db9f0278 JB |
2435 | return val; |
2436 | } | |
2437 | \f | |
2438 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
9dbc9081 PJ |
2439 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2440 | Then return the value FUNCTION returns. | |
2441 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2442 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
2443 | (nargs, args) | |
db9f0278 JB |
2444 | int nargs; |
2445 | Lisp_Object *args; | |
2446 | { | |
2447 | register int i, numargs; | |
2448 | register Lisp_Object spread_arg; | |
2449 | register Lisp_Object *funcall_args; | |
db9f0278 | 2450 | Lisp_Object fun; |
96d44c64 | 2451 | struct gcpro gcpro1; |
db9f0278 JB |
2452 | |
2453 | fun = args [0]; | |
2454 | funcall_args = 0; | |
2455 | spread_arg = args [nargs - 1]; | |
b7826503 | 2456 | CHECK_LIST (spread_arg); |
177c0ea7 | 2457 | |
db9f0278 JB |
2458 | numargs = XINT (Flength (spread_arg)); |
2459 | ||
2460 | if (numargs == 0) | |
2461 | return Ffuncall (nargs - 1, args); | |
2462 | else if (numargs == 1) | |
2463 | { | |
03699b14 | 2464 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2465 | return Ffuncall (nargs, args); |
2466 | } | |
2467 | ||
a6e3fa71 | 2468 | numargs += nargs - 2; |
db9f0278 | 2469 | |
8788120f KS |
2470 | /* Optimize for no indirection. */ |
2471 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2472 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2473 | fun = indirect_function (fun); | |
ffd56f97 | 2474 | if (EQ (fun, Qunbound)) |
db9f0278 | 2475 | { |
ffd56f97 JB |
2476 | /* Let funcall get the error */ |
2477 | fun = args[0]; | |
2478 | goto funcall; | |
db9f0278 JB |
2479 | } |
2480 | ||
90165123 | 2481 | if (SUBRP (fun)) |
db9f0278 JB |
2482 | { |
2483 | if (numargs < XSUBR (fun)->min_args | |
2484 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2485 | goto funcall; /* Let funcall get the error */ | |
2486 | else if (XSUBR (fun)->max_args > numargs) | |
2487 | { | |
2488 | /* Avoid making funcall cons up a yet another new vector of arguments | |
2489 | by explicitly supplying nil's for optional values */ | |
2490 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
2491 | * sizeof (Lisp_Object)); | |
2492 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
2493 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2494 | GCPRO1 (*funcall_args); |
2495 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2496 | } |
2497 | } | |
2498 | funcall: | |
2499 | /* We add 1 to numargs because funcall_args includes the | |
2500 | function itself as well as its arguments. */ | |
2501 | if (!funcall_args) | |
a6e3fa71 JB |
2502 | { |
2503 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
2504 | * sizeof (Lisp_Object)); | |
96d44c64 SM |
2505 | GCPRO1 (*funcall_args); |
2506 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2507 | } |
2508 | ||
db9f0278 JB |
2509 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
2510 | /* Spread the last arg we got. Its first element goes in | |
2511 | the slot that it used to occupy, hence this value of I. */ | |
2512 | i = nargs - 1; | |
265a9e55 | 2513 | while (!NILP (spread_arg)) |
db9f0278 | 2514 | { |
03699b14 KR |
2515 | funcall_args [i++] = XCAR (spread_arg); |
2516 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2517 | } |
a6e3fa71 | 2518 | |
96d44c64 SM |
2519 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
2520 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
2521 | } |
2522 | \f | |
ff936e53 SM |
2523 | /* Run hook variables in various ways. */ |
2524 | ||
2525 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
2901f1d1 SM |
2526 | static Lisp_Object run_hook_with_args P_ ((int, Lisp_Object *, |
2527 | enum run_hooks_condition)); | |
ff936e53 | 2528 | |
8b5176cd | 2529 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2530 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2531 | Each argument should be a symbol, a hook variable. |
2532 | These symbols are processed in the order specified. | |
2533 | If a hook symbol has a non-nil value, that value may be a function | |
2534 | or a list of functions to be called to run the hook. | |
2535 | If the value is a function, it is called with no arguments. | |
2536 | If it is a list, the elements are called, in order, with no arguments. | |
2537 | ||
9f685258 LK |
2538 | Major modes should not use this function directly to run their mode |
2539 | hook; they should use `run-mode-hooks' instead. | |
2540 | ||
72e85d5d RS |
2541 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2542 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2543 | usage: (run-hooks &rest HOOKS) */) |
2544 | (nargs, args) | |
ff936e53 SM |
2545 | int nargs; |
2546 | Lisp_Object *args; | |
2547 | { | |
2548 | Lisp_Object hook[1]; | |
2549 | register int i; | |
2550 | ||
2551 | for (i = 0; i < nargs; i++) | |
2552 | { | |
2553 | hook[0] = args[i]; | |
2554 | run_hook_with_args (1, hook, to_completion); | |
2555 | } | |
2556 | ||
2557 | return Qnil; | |
2558 | } | |
177c0ea7 | 2559 | |
a0d76c27 | 2560 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2561 | Srun_hook_with_args, 1, MANY, 0, |
2562 | doc: /* Run HOOK with the specified arguments ARGS. | |
2563 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2564 | value, that value may be a function or a list of functions to be | |
2565 | called to run the hook. If the value is a function, it is called with | |
2566 | the given arguments and its return value is returned. If it is a list | |
2567 | of functions, those functions are called, in order, | |
2568 | with the given arguments ARGS. | |
d5e2c90c | 2569 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2570 | as that may change. |
2571 | ||
72e85d5d RS |
2572 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2573 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2574 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
2575 | (nargs, args) | |
ff936e53 SM |
2576 | int nargs; |
2577 | Lisp_Object *args; | |
2578 | { | |
2579 | return run_hook_with_args (nargs, args, to_completion); | |
2580 | } | |
2581 | ||
a0d76c27 | 2582 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2583 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2584 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2585 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2586 | value, that value may be a function or a list of functions to be | |
2587 | called to run the hook. If the value is a function, it is called with | |
2588 | the given arguments and its return value is returned. | |
2589 | If it is a list of functions, those functions are called, in order, | |
2590 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2591 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2592 | However, if they all return nil, we return nil. |
9dbc9081 | 2593 | |
72e85d5d RS |
2594 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2595 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2596 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
2597 | (nargs, args) | |
b0b667cb KH |
2598 | int nargs; |
2599 | Lisp_Object *args; | |
2600 | { | |
ff936e53 SM |
2601 | return run_hook_with_args (nargs, args, until_success); |
2602 | } | |
2603 | ||
a0d76c27 | 2604 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2605 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2606 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2607 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2608 | value, that value may be a function or a list of functions to be | |
2609 | called to run the hook. If the value is a function, it is called with | |
2610 | the given arguments and its return value is returned. | |
2611 | If it is a list of functions, those functions are called, in order, | |
2612 | with the given arguments ARGS, until one of them returns nil. | |
2613 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2614 | |
72e85d5d RS |
2615 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2616 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2617 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
2618 | (nargs, args) | |
ff936e53 SM |
2619 | int nargs; |
2620 | Lisp_Object *args; | |
2621 | { | |
2622 | return run_hook_with_args (nargs, args, until_failure); | |
2623 | } | |
2624 | ||
c933ea05 RS |
2625 | /* ARGS[0] should be a hook symbol. |
2626 | Call each of the functions in the hook value, passing each of them | |
2627 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2628 | COND specifies a condition to test after each call | |
2629 | to decide whether to stop. | |
2630 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2631 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2632 | ||
2901f1d1 | 2633 | static Lisp_Object |
ff936e53 SM |
2634 | run_hook_with_args (nargs, args, cond) |
2635 | int nargs; | |
2636 | Lisp_Object *args; | |
2637 | enum run_hooks_condition cond; | |
2638 | { | |
2639 | Lisp_Object sym, val, ret; | |
fada05d6 KH |
2640 | Lisp_Object globals; |
2641 | struct gcpro gcpro1, gcpro2, gcpro3; | |
b0b667cb | 2642 | |
f029ca5f RS |
2643 | /* If we are dying or still initializing, |
2644 | don't do anything--it would probably crash if we tried. */ | |
2645 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2646 | return Qnil; |
f029ca5f | 2647 | |
b0b667cb | 2648 | sym = args[0]; |
aa681b51 | 2649 | val = find_symbol_value (sym); |
ff936e53 SM |
2650 | ret = (cond == until_failure ? Qt : Qnil); |
2651 | ||
b0b667cb | 2652 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2653 | return ret; |
03699b14 | 2654 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2655 | { |
2656 | args[0] = val; | |
2657 | return Ffuncall (nargs, args); | |
2658 | } | |
2659 | else | |
2660 | { | |
fada05d6 KH |
2661 | globals = Qnil; |
2662 | GCPRO3 (sym, val, globals); | |
cb9d21f8 | 2663 | |
ff936e53 SM |
2664 | for (; |
2665 | CONSP (val) && ((cond == to_completion) | |
2666 | || (cond == until_success ? NILP (ret) | |
2667 | : !NILP (ret))); | |
03699b14 | 2668 | val = XCDR (val)) |
b0b667cb | 2669 | { |
03699b14 | 2670 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2671 | { |
2672 | /* t indicates this hook has a local binding; | |
2673 | it means to run the global binding too. */ | |
b0b667cb | 2674 | |
ff936e53 SM |
2675 | for (globals = Fdefault_value (sym); |
2676 | CONSP (globals) && ((cond == to_completion) | |
2677 | || (cond == until_success ? NILP (ret) | |
2678 | : !NILP (ret))); | |
03699b14 | 2679 | globals = XCDR (globals)) |
b0b667cb | 2680 | { |
03699b14 | 2681 | args[0] = XCAR (globals); |
77d92e05 RS |
2682 | /* In a global value, t should not occur. If it does, we |
2683 | must ignore it to avoid an endless loop. */ | |
2684 | if (!EQ (args[0], Qt)) | |
2685 | ret = Ffuncall (nargs, args); | |
b0b667cb KH |
2686 | } |
2687 | } | |
2688 | else | |
2689 | { | |
03699b14 | 2690 | args[0] = XCAR (val); |
ff936e53 | 2691 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2692 | } |
2693 | } | |
cb9d21f8 RS |
2694 | |
2695 | UNGCPRO; | |
ff936e53 | 2696 | return ret; |
b0b667cb KH |
2697 | } |
2698 | } | |
c933ea05 RS |
2699 | |
2700 | /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual | |
2701 | present value of that symbol. | |
2702 | Call each element of FUNLIST, | |
2703 | passing each of them the rest of ARGS. | |
2704 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2705 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2706 | ||
2707 | Lisp_Object | |
2708 | run_hook_list_with_args (funlist, nargs, args) | |
2709 | Lisp_Object funlist; | |
2710 | int nargs; | |
2711 | Lisp_Object *args; | |
2712 | { | |
2713 | Lisp_Object sym; | |
2714 | Lisp_Object val; | |
fada05d6 KH |
2715 | Lisp_Object globals; |
2716 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c933ea05 RS |
2717 | |
2718 | sym = args[0]; | |
fada05d6 KH |
2719 | globals = Qnil; |
2720 | GCPRO3 (sym, val, globals); | |
c933ea05 | 2721 | |
03699b14 | 2722 | for (val = funlist; CONSP (val); val = XCDR (val)) |
c933ea05 | 2723 | { |
03699b14 | 2724 | if (EQ (XCAR (val), Qt)) |
c933ea05 RS |
2725 | { |
2726 | /* t indicates this hook has a local binding; | |
2727 | it means to run the global binding too. */ | |
c933ea05 RS |
2728 | |
2729 | for (globals = Fdefault_value (sym); | |
2730 | CONSP (globals); | |
03699b14 | 2731 | globals = XCDR (globals)) |
c933ea05 | 2732 | { |
03699b14 | 2733 | args[0] = XCAR (globals); |
77d92e05 RS |
2734 | /* In a global value, t should not occur. If it does, we |
2735 | must ignore it to avoid an endless loop. */ | |
2736 | if (!EQ (args[0], Qt)) | |
2737 | Ffuncall (nargs, args); | |
c933ea05 RS |
2738 | } |
2739 | } | |
2740 | else | |
2741 | { | |
03699b14 | 2742 | args[0] = XCAR (val); |
c933ea05 RS |
2743 | Ffuncall (nargs, args); |
2744 | } | |
2745 | } | |
2746 | UNGCPRO; | |
2747 | return Qnil; | |
2748 | } | |
7d48558f RS |
2749 | |
2750 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ | |
2751 | ||
2752 | void | |
2753 | run_hook_with_args_2 (hook, arg1, arg2) | |
2754 | Lisp_Object hook, arg1, arg2; | |
2755 | { | |
2756 | Lisp_Object temp[3]; | |
2757 | temp[0] = hook; | |
2758 | temp[1] = arg1; | |
2759 | temp[2] = arg2; | |
2760 | ||
2761 | Frun_hook_with_args (3, temp); | |
2762 | } | |
ff936e53 | 2763 | \f |
db9f0278 JB |
2764 | /* Apply fn to arg */ |
2765 | Lisp_Object | |
2766 | apply1 (fn, arg) | |
2767 | Lisp_Object fn, arg; | |
2768 | { | |
a6e3fa71 JB |
2769 | struct gcpro gcpro1; |
2770 | ||
2771 | GCPRO1 (fn); | |
265a9e55 | 2772 | if (NILP (arg)) |
a6e3fa71 JB |
2773 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2774 | gcpro1.nvars = 2; | |
db9f0278 JB |
2775 | #ifdef NO_ARG_ARRAY |
2776 | { | |
2777 | Lisp_Object args[2]; | |
2778 | args[0] = fn; | |
2779 | args[1] = arg; | |
a6e3fa71 JB |
2780 | gcpro1.var = args; |
2781 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 JB |
2782 | } |
2783 | #else /* not NO_ARG_ARRAY */ | |
a6e3fa71 | 2784 | RETURN_UNGCPRO (Fapply (2, &fn)); |
db9f0278 JB |
2785 | #endif /* not NO_ARG_ARRAY */ |
2786 | } | |
2787 | ||
2788 | /* Call function fn on no arguments */ | |
2789 | Lisp_Object | |
2790 | call0 (fn) | |
2791 | Lisp_Object fn; | |
2792 | { | |
a6e3fa71 JB |
2793 | struct gcpro gcpro1; |
2794 | ||
2795 | GCPRO1 (fn); | |
2796 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2797 | } |
2798 | ||
15285f9f | 2799 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2800 | /* ARGSUSED */ |
2801 | Lisp_Object | |
15285f9f RS |
2802 | call1 (fn, arg1) |
2803 | Lisp_Object fn, arg1; | |
db9f0278 | 2804 | { |
a6e3fa71 | 2805 | struct gcpro gcpro1; |
db9f0278 | 2806 | #ifdef NO_ARG_ARRAY |
177c0ea7 | 2807 | Lisp_Object args[2]; |
a6e3fa71 | 2808 | |
db9f0278 | 2809 | args[0] = fn; |
15285f9f | 2810 | args[1] = arg1; |
a6e3fa71 JB |
2811 | GCPRO1 (args[0]); |
2812 | gcpro1.nvars = 2; | |
2813 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 | 2814 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2815 | GCPRO1 (fn); |
2816 | gcpro1.nvars = 2; | |
2817 | RETURN_UNGCPRO (Ffuncall (2, &fn)); | |
db9f0278 JB |
2818 | #endif /* not NO_ARG_ARRAY */ |
2819 | } | |
2820 | ||
15285f9f | 2821 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2822 | /* ARGSUSED */ |
2823 | Lisp_Object | |
15285f9f RS |
2824 | call2 (fn, arg1, arg2) |
2825 | Lisp_Object fn, arg1, arg2; | |
db9f0278 | 2826 | { |
a6e3fa71 | 2827 | struct gcpro gcpro1; |
db9f0278 JB |
2828 | #ifdef NO_ARG_ARRAY |
2829 | Lisp_Object args[3]; | |
2830 | args[0] = fn; | |
15285f9f RS |
2831 | args[1] = arg1; |
2832 | args[2] = arg2; | |
a6e3fa71 JB |
2833 | GCPRO1 (args[0]); |
2834 | gcpro1.nvars = 3; | |
2835 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 | 2836 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2837 | GCPRO1 (fn); |
2838 | gcpro1.nvars = 3; | |
2839 | RETURN_UNGCPRO (Ffuncall (3, &fn)); | |
db9f0278 JB |
2840 | #endif /* not NO_ARG_ARRAY */ |
2841 | } | |
2842 | ||
15285f9f | 2843 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2844 | /* ARGSUSED */ |
2845 | Lisp_Object | |
15285f9f RS |
2846 | call3 (fn, arg1, arg2, arg3) |
2847 | Lisp_Object fn, arg1, arg2, arg3; | |
db9f0278 | 2848 | { |
a6e3fa71 | 2849 | struct gcpro gcpro1; |
db9f0278 JB |
2850 | #ifdef NO_ARG_ARRAY |
2851 | Lisp_Object args[4]; | |
2852 | args[0] = fn; | |
15285f9f RS |
2853 | args[1] = arg1; |
2854 | args[2] = arg2; | |
2855 | args[3] = arg3; | |
a6e3fa71 JB |
2856 | GCPRO1 (args[0]); |
2857 | gcpro1.nvars = 4; | |
2858 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 | 2859 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2860 | GCPRO1 (fn); |
2861 | gcpro1.nvars = 4; | |
2862 | RETURN_UNGCPRO (Ffuncall (4, &fn)); | |
db9f0278 JB |
2863 | #endif /* not NO_ARG_ARRAY */ |
2864 | } | |
2865 | ||
15285f9f | 2866 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2867 | /* ARGSUSED */ |
2868 | Lisp_Object | |
15285f9f RS |
2869 | call4 (fn, arg1, arg2, arg3, arg4) |
2870 | Lisp_Object fn, arg1, arg2, arg3, arg4; | |
a5a44b91 JB |
2871 | { |
2872 | struct gcpro gcpro1; | |
2873 | #ifdef NO_ARG_ARRAY | |
2874 | Lisp_Object args[5]; | |
2875 | args[0] = fn; | |
15285f9f RS |
2876 | args[1] = arg1; |
2877 | args[2] = arg2; | |
2878 | args[3] = arg3; | |
2879 | args[4] = arg4; | |
a5a44b91 JB |
2880 | GCPRO1 (args[0]); |
2881 | gcpro1.nvars = 5; | |
2882 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
2883 | #else /* not NO_ARG_ARRAY */ | |
2884 | GCPRO1 (fn); | |
2885 | gcpro1.nvars = 5; | |
2886 | RETURN_UNGCPRO (Ffuncall (5, &fn)); | |
2887 | #endif /* not NO_ARG_ARRAY */ | |
2888 | } | |
2889 | ||
15285f9f RS |
2890 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2891 | /* ARGSUSED */ | |
2892 | Lisp_Object | |
2893 | call5 (fn, arg1, arg2, arg3, arg4, arg5) | |
2894 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5; | |
2895 | { | |
2896 | struct gcpro gcpro1; | |
2897 | #ifdef NO_ARG_ARRAY | |
2898 | Lisp_Object args[6]; | |
2899 | args[0] = fn; | |
2900 | args[1] = arg1; | |
2901 | args[2] = arg2; | |
2902 | args[3] = arg3; | |
2903 | args[4] = arg4; | |
2904 | args[5] = arg5; | |
2905 | GCPRO1 (args[0]); | |
2906 | gcpro1.nvars = 6; | |
2907 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
2908 | #else /* not NO_ARG_ARRAY */ | |
2909 | GCPRO1 (fn); | |
2910 | gcpro1.nvars = 6; | |
2911 | RETURN_UNGCPRO (Ffuncall (6, &fn)); | |
2912 | #endif /* not NO_ARG_ARRAY */ | |
2913 | } | |
2914 | ||
2915 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2916 | /* ARGSUSED */ | |
2917 | Lisp_Object | |
2918 | call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6) | |
2919 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6; | |
2920 | { | |
2921 | struct gcpro gcpro1; | |
2922 | #ifdef NO_ARG_ARRAY | |
2923 | Lisp_Object args[7]; | |
2924 | args[0] = fn; | |
2925 | args[1] = arg1; | |
2926 | args[2] = arg2; | |
2927 | args[3] = arg3; | |
2928 | args[4] = arg4; | |
2929 | args[5] = arg5; | |
2930 | args[6] = arg6; | |
2931 | GCPRO1 (args[0]); | |
2932 | gcpro1.nvars = 7; | |
2933 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
2934 | #else /* not NO_ARG_ARRAY */ | |
2935 | GCPRO1 (fn); | |
2936 | gcpro1.nvars = 7; | |
2937 | RETURN_UNGCPRO (Ffuncall (7, &fn)); | |
2938 | #endif /* not NO_ARG_ARRAY */ | |
2939 | } | |
2940 | ||
6c2ef893 RS |
2941 | /* The caller should GCPRO all the elements of ARGS. */ |
2942 | ||
db9f0278 | 2943 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2944 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2945 | Return the value that function returns. | |
2946 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2947 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
2948 | (nargs, args) | |
db9f0278 JB |
2949 | int nargs; |
2950 | Lisp_Object *args; | |
2951 | { | |
8788120f | 2952 | Lisp_Object fun, original_fun; |
db9f0278 JB |
2953 | Lisp_Object funcar; |
2954 | int numargs = nargs - 1; | |
2955 | Lisp_Object lisp_numargs; | |
2956 | Lisp_Object val; | |
2957 | struct backtrace backtrace; | |
2958 | register Lisp_Object *internal_args; | |
2959 | register int i; | |
2960 | ||
2961 | QUIT; | |
ee830945 RS |
2962 | if ((consing_since_gc > gc_cons_threshold |
2963 | && consing_since_gc > gc_relative_threshold) | |
2964 | || | |
2965 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 2966 | Fgarbage_collect (); |
db9f0278 JB |
2967 | |
2968 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2969 | { | |
2970 | if (max_lisp_eval_depth < 100) | |
2971 | max_lisp_eval_depth = 100; | |
2972 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2973 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2974 | } |
2975 | ||
2976 | backtrace.next = backtrace_list; | |
2977 | backtrace_list = &backtrace; | |
2978 | backtrace.function = &args[0]; | |
2979 | backtrace.args = &args[1]; | |
2980 | backtrace.nargs = nargs - 1; | |
2981 | backtrace.evalargs = 0; | |
2982 | backtrace.debug_on_exit = 0; | |
2983 | ||
2984 | if (debug_on_next_call) | |
2985 | do_debug_on_call (Qlambda); | |
2986 | ||
fff3ff9c KS |
2987 | CHECK_CONS_LIST (); |
2988 | ||
8788120f KS |
2989 | original_fun = args[0]; |
2990 | ||
db9f0278 JB |
2991 | retry: |
2992 | ||
8788120f KS |
2993 | /* Optimize for no indirection. */ |
2994 | fun = original_fun; | |
2995 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2996 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2997 | fun = indirect_function (fun); | |
db9f0278 | 2998 | |
90165123 | 2999 | if (SUBRP (fun)) |
db9f0278 | 3000 | { |
fff3ff9c | 3001 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
3002 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
3003 | { | |
a631e24c | 3004 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 3005 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
3006 | } |
3007 | ||
3008 | if (XSUBR (fun)->max_args == UNEVALLED) | |
734d55a2 | 3009 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3010 | |
3011 | if (XSUBR (fun)->max_args == MANY) | |
3012 | { | |
3013 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
3014 | goto done; | |
3015 | } | |
3016 | ||
3017 | if (XSUBR (fun)->max_args > numargs) | |
3018 | { | |
3019 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
3020 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
3021 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
3022 | internal_args[i] = Qnil; | |
3023 | } | |
3024 | else | |
3025 | internal_args = args + 1; | |
3026 | switch (XSUBR (fun)->max_args) | |
3027 | { | |
3028 | case 0: | |
3029 | val = (*XSUBR (fun)->function) (); | |
3030 | goto done; | |
3031 | case 1: | |
3032 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
3033 | goto done; | |
3034 | case 2: | |
82fc29a1 | 3035 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1]); |
db9f0278 JB |
3036 | goto done; |
3037 | case 3: | |
3038 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3039 | internal_args[2]); | |
3040 | goto done; | |
3041 | case 4: | |
3042 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
82fc29a1 | 3043 | internal_args[2], internal_args[3]); |
db9f0278 JB |
3044 | goto done; |
3045 | case 5: | |
3046 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3047 | internal_args[2], internal_args[3], | |
3048 | internal_args[4]); | |
3049 | goto done; | |
3050 | case 6: | |
3051 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3052 | internal_args[2], internal_args[3], | |
3053 | internal_args[4], internal_args[5]); | |
3054 | goto done; | |
15c65264 RS |
3055 | case 7: |
3056 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3057 | internal_args[2], internal_args[3], | |
3058 | internal_args[4], internal_args[5], | |
3059 | internal_args[6]); | |
3060 | goto done; | |
db9f0278 | 3061 | |
166c822d KH |
3062 | case 8: |
3063 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3064 | internal_args[2], internal_args[3], | |
3065 | internal_args[4], internal_args[5], | |
3066 | internal_args[6], internal_args[7]); | |
3067 | goto done; | |
3068 | ||
db9f0278 | 3069 | default: |
70ee42f7 | 3070 | |
166c822d | 3071 | /* If a subr takes more than 8 arguments without using MANY |
177c0ea7 | 3072 | or UNEVALLED, we need to extend this function to support it. |
70ee42f7 JB |
3073 | Until this is done, there is no way to call the function. */ |
3074 | abort (); | |
db9f0278 JB |
3075 | } |
3076 | } | |
90165123 | 3077 | if (COMPILEDP (fun)) |
db9f0278 JB |
3078 | val = funcall_lambda (fun, numargs, args + 1); |
3079 | else | |
3080 | { | |
8788120f | 3081 | if (EQ (fun, Qunbound)) |
734d55a2 | 3082 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 3083 | if (!CONSP (fun)) |
734d55a2 KS |
3084 | xsignal1 (Qinvalid_function, original_fun); |
3085 | funcar = XCAR (fun); | |
90165123 | 3086 | if (!SYMBOLP (funcar)) |
734d55a2 | 3087 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3088 | if (EQ (funcar, Qlambda)) |
3089 | val = funcall_lambda (fun, numargs, args + 1); | |
db9f0278 JB |
3090 | else if (EQ (funcar, Qautoload)) |
3091 | { | |
8788120f | 3092 | do_autoload (fun, original_fun); |
fff3ff9c | 3093 | CHECK_CONS_LIST (); |
db9f0278 JB |
3094 | goto retry; |
3095 | } | |
3096 | else | |
734d55a2 | 3097 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3098 | } |
3099 | done: | |
c1788fbc | 3100 | CHECK_CONS_LIST (); |
db9f0278 JB |
3101 | lisp_eval_depth--; |
3102 | if (backtrace.debug_on_exit) | |
3103 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
3104 | backtrace_list = backtrace.next; | |
3105 | return val; | |
3106 | } | |
3107 | \f | |
3108 | Lisp_Object | |
3109 | apply_lambda (fun, args, eval_flag) | |
3110 | Lisp_Object fun, args; | |
3111 | int eval_flag; | |
3112 | { | |
3113 | Lisp_Object args_left; | |
3114 | Lisp_Object numargs; | |
3115 | register Lisp_Object *arg_vector; | |
3116 | struct gcpro gcpro1, gcpro2, gcpro3; | |
3117 | register int i; | |
3118 | register Lisp_Object tem; | |
3119 | ||
3120 | numargs = Flength (args); | |
3121 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
3122 | args_left = args; | |
3123 | ||
3124 | GCPRO3 (*arg_vector, args_left, fun); | |
3125 | gcpro1.nvars = 0; | |
3126 | ||
3127 | for (i = 0; i < XINT (numargs);) | |
3128 | { | |
3129 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
3130 | if (eval_flag) tem = Feval (tem); | |
3131 | arg_vector[i++] = tem; | |
3132 | gcpro1.nvars = i; | |
3133 | } | |
3134 | ||
3135 | UNGCPRO; | |
3136 | ||
3137 | if (eval_flag) | |
3138 | { | |
3139 | backtrace_list->args = arg_vector; | |
3140 | backtrace_list->nargs = i; | |
3141 | } | |
3142 | backtrace_list->evalargs = 0; | |
3143 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
3144 | ||
3145 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3146 | if (backtrace_list->debug_on_exit) | |
3147 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3148 | /* Don't do it again when we return to eval. */ | |
3149 | backtrace_list->debug_on_exit = 0; | |
3150 | return tem; | |
3151 | } | |
3152 | ||
3153 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
3154 | and return the result of evaluation. | |
3155 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3156 | ||
2901f1d1 | 3157 | static Lisp_Object |
db9f0278 JB |
3158 | funcall_lambda (fun, nargs, arg_vector) |
3159 | Lisp_Object fun; | |
3160 | int nargs; | |
3161 | register Lisp_Object *arg_vector; | |
3162 | { | |
9ab90667 | 3163 | Lisp_Object val, syms_left, next; |
aed13378 | 3164 | int count = SPECPDL_INDEX (); |
9ab90667 | 3165 | int i, optional, rest; |
db9f0278 | 3166 | |
90165123 | 3167 | if (CONSP (fun)) |
9ab90667 GM |
3168 | { |
3169 | syms_left = XCDR (fun); | |
3170 | if (CONSP (syms_left)) | |
3171 | syms_left = XCAR (syms_left); | |
3172 | else | |
734d55a2 | 3173 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3174 | } |
90165123 | 3175 | else if (COMPILEDP (fun)) |
845975f5 | 3176 | syms_left = AREF (fun, COMPILED_ARGLIST); |
9ab90667 GM |
3177 | else |
3178 | abort (); | |
db9f0278 | 3179 | |
9ab90667 GM |
3180 | i = optional = rest = 0; |
3181 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3182 | { |
3183 | QUIT; | |
177c0ea7 | 3184 | |
9ab90667 | 3185 | next = XCAR (syms_left); |
8788120f | 3186 | if (!SYMBOLP (next)) |
734d55a2 | 3187 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3188 | |
db9f0278 JB |
3189 | if (EQ (next, Qand_rest)) |
3190 | rest = 1; | |
3191 | else if (EQ (next, Qand_optional)) | |
3192 | optional = 1; | |
3193 | else if (rest) | |
3194 | { | |
9ffa21d4 | 3195 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
3196 | i = nargs; |
3197 | } | |
3198 | else if (i < nargs) | |
9ab90667 | 3199 | specbind (next, arg_vector[i++]); |
db9f0278 | 3200 | else if (!optional) |
734d55a2 | 3201 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 JB |
3202 | else |
3203 | specbind (next, Qnil); | |
3204 | } | |
3205 | ||
9ab90667 | 3206 | if (!NILP (syms_left)) |
734d55a2 | 3207 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3208 | else if (i < nargs) |
734d55a2 | 3209 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3210 | |
90165123 | 3211 | if (CONSP (fun)) |
9ab90667 | 3212 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3213 | else |
ca248607 RS |
3214 | { |
3215 | /* If we have not actually read the bytecode string | |
3216 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3217 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3218 | Ffetch_bytecode (fun); |
845975f5 SM |
3219 | val = Fbyte_code (AREF (fun, COMPILED_BYTECODE), |
3220 | AREF (fun, COMPILED_CONSTANTS), | |
3221 | AREF (fun, COMPILED_STACK_DEPTH)); | |
ca248607 | 3222 | } |
177c0ea7 | 3223 | |
db9f0278 JB |
3224 | return unbind_to (count, val); |
3225 | } | |
661c7d6e KH |
3226 | |
3227 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3228 | 1, 1, 0, |
3229 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
3230 | (object) | |
661c7d6e KH |
3231 | Lisp_Object object; |
3232 | { | |
3233 | Lisp_Object tem; | |
3234 | ||
845975f5 | 3235 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3236 | { |
845975f5 | 3237 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3238 | if (!CONSP (tem)) |
845975f5 SM |
3239 | { |
3240 | tem = AREF (object, COMPILED_BYTECODE); | |
3241 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3242 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3243 | else |
3244 | error ("Invalid byte code"); | |
3245 | } | |
3ae565b3 SM |
3246 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3247 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3248 | } |
3249 | return object; | |
3250 | } | |
db9f0278 JB |
3251 | \f |
3252 | void | |
3253 | grow_specpdl () | |
3254 | { | |
aed13378 | 3255 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3256 | if (specpdl_size >= max_specpdl_size) |
3257 | { | |
3258 | if (max_specpdl_size < 400) | |
3259 | max_specpdl_size = 400; | |
3260 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3261 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3262 | } |
3263 | specpdl_size *= 2; | |
3264 | if (specpdl_size > max_specpdl_size) | |
3265 | specpdl_size = max_specpdl_size; | |
3266 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3267 | specpdl_ptr = specpdl + count; | |
3268 | } | |
3269 | ||
3270 | void | |
3271 | specbind (symbol, value) | |
3272 | Lisp_Object symbol, value; | |
3273 | { | |
19cebf5a | 3274 | Lisp_Object valcontents; |
db9f0278 | 3275 | |
b7826503 | 3276 | CHECK_SYMBOL (symbol); |
db9f0278 JB |
3277 | if (specpdl_ptr == specpdl + specpdl_size) |
3278 | grow_specpdl (); | |
719177b3 | 3279 | |
19cebf5a GM |
3280 | /* The most common case is that of a non-constant symbol with a |
3281 | trivial value. Make that as fast as we can. */ | |
3282 | valcontents = SYMBOL_VALUE (symbol); | |
3283 | if (!MISCP (valcontents) && !SYMBOL_CONSTANT_P (symbol)) | |
719177b3 | 3284 | { |
9ab90667 | 3285 | specpdl_ptr->symbol = symbol; |
19cebf5a | 3286 | specpdl_ptr->old_value = valcontents; |
9ab90667 GM |
3287 | specpdl_ptr->func = NULL; |
3288 | ++specpdl_ptr; | |
19cebf5a | 3289 | SET_SYMBOL_VALUE (symbol, value); |
719177b3 RS |
3290 | } |
3291 | else | |
9ab90667 | 3292 | { |
136eb6ed | 3293 | Lisp_Object ovalue = find_symbol_value (symbol); |
9ab90667 GM |
3294 | specpdl_ptr->func = 0; |
3295 | specpdl_ptr->old_value = ovalue; | |
719177b3 | 3296 | |
eb700b82 GM |
3297 | valcontents = XSYMBOL (symbol)->value; |
3298 | ||
3299 | if (BUFFER_LOCAL_VALUEP (valcontents) | |
eb700b82 | 3300 | || BUFFER_OBJFWDP (valcontents)) |
9ab90667 | 3301 | { |
0967b4b0 GM |
3302 | Lisp_Object where, current_buffer; |
3303 | ||
3304 | current_buffer = Fcurrent_buffer (); | |
177c0ea7 | 3305 | |
9ab90667 | 3306 | /* For a local variable, record both the symbol and which |
eb700b82 GM |
3307 | buffer's or frame's value we are saving. */ |
3308 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
0967b4b0 | 3309 | where = current_buffer; |
67ee9f6e | 3310 | else if (BUFFER_LOCAL_VALUEP (valcontents) |
eb700b82 GM |
3311 | && XBUFFER_LOCAL_VALUE (valcontents)->found_for_frame) |
3312 | where = XBUFFER_LOCAL_VALUE (valcontents)->frame; | |
3313 | else | |
3314 | where = Qnil; | |
3315 | ||
3316 | /* We're not using the `unused' slot in the specbinding | |
3317 | structure because this would mean we have to do more | |
3318 | work for simple variables. */ | |
0967b4b0 | 3319 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, current_buffer)); |
06bccf8e GM |
3320 | |
3321 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3322 | buffer-local value here, make the `let' change the global | |
3323 | value by changing the value of SYMBOL in all buffers not | |
3324 | having their own value. This is consistent with what | |
3325 | happens with other buffer-local variables. */ | |
eb700b82 GM |
3326 | if (NILP (where) |
3327 | && BUFFER_OBJFWDP (valcontents)) | |
06bccf8e GM |
3328 | { |
3329 | ++specpdl_ptr; | |
3330 | Fset_default (symbol, value); | |
3331 | return; | |
3332 | } | |
9ab90667 GM |
3333 | } |
3334 | else | |
3335 | specpdl_ptr->symbol = symbol; | |
3336 | ||
3337 | specpdl_ptr++; | |
136eb6ed SM |
3338 | /* We used to do |
3339 | if (BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue)) | |
3340 | store_symval_forwarding (symbol, ovalue, value, NULL); | |
3341 | else | |
3342 | but ovalue comes from find_symbol_value which should never return | |
3343 | such an internal value. */ | |
3344 | eassert (!(BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue))); | |
3345 | set_internal (symbol, value, 0, 1); | |
9ab90667 | 3346 | } |
db9f0278 JB |
3347 | } |
3348 | ||
3349 | void | |
3350 | record_unwind_protect (function, arg) | |
1d159538 | 3351 | Lisp_Object (*function) P_ ((Lisp_Object)); |
db9f0278 JB |
3352 | Lisp_Object arg; |
3353 | { | |
9ba8e10d CY |
3354 | eassert (!handling_signal); |
3355 | ||
db9f0278 JB |
3356 | if (specpdl_ptr == specpdl + specpdl_size) |
3357 | grow_specpdl (); | |
3358 | specpdl_ptr->func = function; | |
3359 | specpdl_ptr->symbol = Qnil; | |
3360 | specpdl_ptr->old_value = arg; | |
3361 | specpdl_ptr++; | |
3362 | } | |
3363 | ||
3364 | Lisp_Object | |
3365 | unbind_to (count, value) | |
3366 | int count; | |
3367 | Lisp_Object value; | |
3368 | { | |
5a073f50 KS |
3369 | Lisp_Object quitf = Vquit_flag; |
3370 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3371 | |
5a073f50 | 3372 | GCPRO2 (value, quitf); |
db9f0278 JB |
3373 | Vquit_flag = Qnil; |
3374 | ||
3375 | while (specpdl_ptr != specpdl + count) | |
3376 | { | |
611a8f8c RS |
3377 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3378 | the work to unbind it. We decrement first | |
3379 | so that an error in unbinding won't try to unbind | |
3380 | the same entry again, and we copy the binding first | |
3381 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3382 | |
45f266dc DL |
3383 | struct specbinding this_binding; |
3384 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3385 | |
3386 | if (this_binding.func != 0) | |
3387 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3388 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3389 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3390 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3391 | bound a variable that had a buffer-local or frame-local |
3392 | binding. WHERE nil means that the variable had the default | |
0967b4b0 GM |
3393 | value when it was bound. CURRENT-BUFFER is the buffer that |
3394 | was current when the variable was bound. */ | |
611a8f8c | 3395 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3396 | { |
eb700b82 | 3397 | Lisp_Object symbol, where; |
719177b3 | 3398 | |
611a8f8c RS |
3399 | symbol = XCAR (this_binding.symbol); |
3400 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3401 | |
eb700b82 | 3402 | if (NILP (where)) |
611a8f8c | 3403 | Fset_default (symbol, this_binding.old_value); |
eb700b82 | 3404 | else if (BUFFERP (where)) |
611a8f8c | 3405 | set_internal (symbol, this_binding.old_value, XBUFFER (where), 1); |
177c0ea7 | 3406 | else |
611a8f8c | 3407 | set_internal (symbol, this_binding.old_value, NULL, 1); |
719177b3 | 3408 | } |
db9f0278 | 3409 | else |
9ab90667 GM |
3410 | { |
3411 | /* If variable has a trivial value (no forwarding), we can | |
3412 | just set it. No need to check for constant symbols here, | |
3413 | since that was already done by specbind. */ | |
611a8f8c RS |
3414 | if (!MISCP (SYMBOL_VALUE (this_binding.symbol))) |
3415 | SET_SYMBOL_VALUE (this_binding.symbol, this_binding.old_value); | |
9ab90667 | 3416 | else |
611a8f8c | 3417 | set_internal (this_binding.symbol, this_binding.old_value, 0, 1); |
9ab90667 | 3418 | } |
db9f0278 | 3419 | } |
177c0ea7 | 3420 | |
5a073f50 KS |
3421 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3422 | Vquit_flag = quitf; | |
db9f0278 JB |
3423 | |
3424 | UNGCPRO; | |
db9f0278 JB |
3425 | return value; |
3426 | } | |
3427 | \f | |
db9f0278 | 3428 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3429 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3430 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
3431 | (level, flag) | |
db9f0278 JB |
3432 | Lisp_Object level, flag; |
3433 | { | |
3434 | register struct backtrace *backlist = backtrace_list; | |
3435 | register int i; | |
3436 | ||
b7826503 | 3437 | CHECK_NUMBER (level); |
db9f0278 JB |
3438 | |
3439 | for (i = 0; backlist && i < XINT (level); i++) | |
3440 | { | |
3441 | backlist = backlist->next; | |
3442 | } | |
3443 | ||
3444 | if (backlist) | |
265a9e55 | 3445 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3446 | |
3447 | return flag; | |
3448 | } | |
3449 | ||
3450 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3451 | doc: /* Print a trace of Lisp function calls currently active. |
3452 | Output stream used is value of `standard-output'. */) | |
3453 | () | |
db9f0278 JB |
3454 | { |
3455 | register struct backtrace *backlist = backtrace_list; | |
3456 | register int i; | |
3457 | Lisp_Object tail; | |
3458 | Lisp_Object tem; | |
3459 | extern Lisp_Object Vprint_level; | |
3460 | struct gcpro gcpro1; | |
3461 | ||
a631e24c | 3462 | XSETFASTINT (Vprint_level, 3); |
db9f0278 JB |
3463 | |
3464 | tail = Qnil; | |
3465 | GCPRO1 (tail); | |
3466 | ||
3467 | while (backlist) | |
3468 | { | |
3469 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
3470 | if (backlist->nargs == UNEVALLED) | |
3471 | { | |
3472 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3473 | write_string ("\n", -1); |
db9f0278 JB |
3474 | } |
3475 | else | |
3476 | { | |
3477 | tem = *backlist->function; | |
3478 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
3479 | write_string ("(", -1); | |
3480 | if (backlist->nargs == MANY) | |
3481 | { | |
3482 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 3483 | !NILP (tail); |
db9f0278 JB |
3484 | tail = Fcdr (tail), i++) |
3485 | { | |
3486 | if (i) write_string (" ", -1); | |
3487 | Fprin1 (Fcar (tail), Qnil); | |
3488 | } | |
3489 | } | |
3490 | else | |
3491 | { | |
3492 | for (i = 0; i < backlist->nargs; i++) | |
3493 | { | |
3494 | if (i) write_string (" ", -1); | |
3495 | Fprin1 (backlist->args[i], Qnil); | |
3496 | } | |
3497 | } | |
b6703b02 | 3498 | write_string (")\n", -1); |
db9f0278 | 3499 | } |
db9f0278 JB |
3500 | backlist = backlist->next; |
3501 | } | |
3502 | ||
3503 | Vprint_level = Qnil; | |
3504 | UNGCPRO; | |
3505 | return Qnil; | |
3506 | } | |
3507 | ||
17401c97 | 3508 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3509 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3510 | If that frame has not evaluated the arguments yet (or is a special form), | |
3511 | the value is (nil FUNCTION ARG-FORMS...). | |
3512 | If that frame has evaluated its arguments and called its function already, | |
3513 | the value is (t FUNCTION ARG-VALUES...). | |
3514 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3515 | FUNCTION is whatever was supplied as car of evaluated list, | |
3516 | or a lambda expression for macro calls. | |
3517 | If NFRAMES is more than the number of frames, the value is nil. */) | |
3518 | (nframes) | |
db9f0278 JB |
3519 | Lisp_Object nframes; |
3520 | { | |
3521 | register struct backtrace *backlist = backtrace_list; | |
3522 | register int i; | |
3523 | Lisp_Object tem; | |
3524 | ||
b7826503 | 3525 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3526 | |
3527 | /* Find the frame requested. */ | |
b6703b02 | 3528 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3529 | backlist = backlist->next; |
3530 | ||
3531 | if (!backlist) | |
3532 | return Qnil; | |
3533 | if (backlist->nargs == UNEVALLED) | |
3534 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
3535 | else | |
3536 | { | |
3537 | if (backlist->nargs == MANY) | |
3538 | tem = *backlist->args; | |
3539 | else | |
3540 | tem = Flist (backlist->nargs, backlist->args); | |
3541 | ||
3542 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3543 | } | |
3544 | } | |
a2ff3819 | 3545 | |
db9f0278 | 3546 | \f |
4ce0541e SM |
3547 | void |
3548 | mark_backtrace () | |
3549 | { | |
3550 | register struct backtrace *backlist; | |
3551 | register int i; | |
3552 | ||
3553 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3554 | { | |
3555 | mark_object (*backlist->function); | |
3556 | ||
3557 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) | |
3558 | i = 0; | |
3559 | else | |
3560 | i = backlist->nargs - 1; | |
3561 | for (; i >= 0; i--) | |
3562 | mark_object (backlist->args[i]); | |
3563 | } | |
3564 | } | |
3565 | ||
dfcf069d | 3566 | void |
db9f0278 JB |
3567 | syms_of_eval () |
3568 | { | |
3569 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
82fc29a1 | 3570 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3571 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3572 | an error is signaled. |
3573 | You can safely use a value considerably larger than the default value, | |
3574 | if that proves inconveniently small. However, if you increase it too far, | |
3575 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 JB |
3576 | |
3577 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
9dbc9081 | 3578 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3579 | |
3580 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3581 | actual stack overflow in C, which would be fatal for Emacs. |
3582 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3583 | if that proves inconveniently small. However, if you increase it too far, |
3584 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 JB |
3585 | |
3586 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
9dbc9081 | 3587 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3588 | If the value is t, that means do an ordinary quit. |
3589 | If the value equals `throw-on-input', that means quit by throwing | |
3590 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3591 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3592 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3593 | Vquit_flag = Qnil; |
3594 | ||
3595 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
9dbc9081 PJ |
3596 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3597 | Note that `quit-flag' will still be set by typing C-g, | |
3598 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3599 | To prevent this happening, set `quit-flag' to nil | |
3600 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3601 | Vinhibit_quit = Qnil; |
3602 | ||
ad236261 JB |
3603 | Qinhibit_quit = intern ("inhibit-quit"); |
3604 | staticpro (&Qinhibit_quit); | |
3605 | ||
db9f0278 JB |
3606 | Qautoload = intern ("autoload"); |
3607 | staticpro (&Qautoload); | |
3608 | ||
3609 | Qdebug_on_error = intern ("debug-on-error"); | |
3610 | staticpro (&Qdebug_on_error); | |
3611 | ||
3612 | Qmacro = intern ("macro"); | |
3613 | staticpro (&Qmacro); | |
3614 | ||
d6edd563 GM |
3615 | Qdeclare = intern ("declare"); |
3616 | staticpro (&Qdeclare); | |
177c0ea7 | 3617 | |
db9f0278 JB |
3618 | /* Note that the process handling also uses Qexit, but we don't want |
3619 | to staticpro it twice, so we just do it here. */ | |
3620 | Qexit = intern ("exit"); | |
3621 | staticpro (&Qexit); | |
3622 | ||
3623 | Qinteractive = intern ("interactive"); | |
3624 | staticpro (&Qinteractive); | |
3625 | ||
3626 | Qcommandp = intern ("commandp"); | |
3627 | staticpro (&Qcommandp); | |
3628 | ||
3629 | Qdefun = intern ("defun"); | |
3630 | staticpro (&Qdefun); | |
3631 | ||
3632 | Qand_rest = intern ("&rest"); | |
3633 | staticpro (&Qand_rest); | |
3634 | ||
3635 | Qand_optional = intern ("&optional"); | |
3636 | staticpro (&Qand_optional); | |
3637 | ||
f01cbfdd RS |
3638 | Qdebug = intern ("debug"); |
3639 | staticpro (&Qdebug); | |
3640 | ||
128c0f66 | 3641 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
704788b3 RS |
3642 | doc: /* *Non-nil means errors display a backtrace buffer. |
3643 | More precisely, this happens for any error that is handled | |
3644 | by the editor command loop. | |
9dbc9081 PJ |
3645 | If the value is a list, an error only means to display a backtrace |
3646 | if one of its condition symbols appears in the list. */); | |
128c0f66 | 3647 | Vstack_trace_on_error = Qnil; |
db9f0278 | 3648 | |
128c0f66 | 3649 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
9dbc9081 PJ |
3650 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3651 | Does not apply to errors handled by `condition-case' or those | |
3652 | matched by `debug-ignored-errors'. | |
3653 | If the value is a list, an error only means to enter the debugger | |
3654 | if one of its condition symbols appears in the list. | |
3655 | When you evaluate an expression interactively, this variable | |
3656 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
3657 | See also variable `debug-on-quit'. */); | |
128c0f66 | 3658 | Vdebug_on_error = Qnil; |
db9f0278 | 3659 | |
fc950e09 | 3660 | DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors, |
9dbc9081 PJ |
3661 | doc: /* *List of errors for which the debugger should not be called. |
3662 | Each element may be a condition-name or a regexp that matches error messages. | |
3663 | If any element applies to a given error, that error skips the debugger | |
3664 | and just returns to top level. | |
3665 | This overrides the variable `debug-on-error'. | |
3666 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3667 | Vdebug_ignored_errors = Qnil; |
3668 | ||
db9f0278 | 3669 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, |
82fc29a1 JB |
3670 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3671 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3672 | debug_on_quit = 0; |
3673 | ||
3674 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
9dbc9081 | 3675 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3676 | |
556d7314 | 3677 | DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue, |
9dbc9081 PJ |
3678 | doc: /* Non-nil means debugger may continue execution. |
3679 | This is nil when the debugger is called under circumstances where it | |
3680 | might not be safe to continue. */); | |
dac204bc | 3681 | debugger_may_continue = 1; |
556d7314 | 3682 | |
db9f0278 | 3683 | DEFVAR_LISP ("debugger", &Vdebugger, |
9dbc9081 PJ |
3684 | doc: /* Function to call to invoke debugger. |
3685 | If due to frame exit, args are `exit' and the value being returned; | |
3686 | this function's value will be returned instead of that. | |
3687 | If due to error, args are `error' and a list of the args to `signal'. | |
3688 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3689 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3690 | Vdebugger = Qnil; |
3691 | ||
61ede770 | 3692 | DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function, |
9dbc9081 PJ |
3693 | doc: /* If non-nil, this is a function for `signal' to call. |
3694 | It receives the same arguments that `signal' was given. | |
3695 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3696 | Vsignal_hook_function = Qnil; |
3697 | ||
57a6e758 | 3698 | DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal, |
9dbc9081 PJ |
3699 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3700 | Note that `debug-on-error', `debug-on-quit' and friends | |
3701 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3702 | Vdebug_on_signal = Qnil; |
61ede770 | 3703 | |
d6edd563 GM |
3704 | DEFVAR_LISP ("macro-declaration-function", &Vmacro_declaration_function, |
3705 | doc: /* Function to process declarations in a macro definition. | |
3706 | The function will be called with two args MACRO and DECL. | |
3707 | MACRO is the name of the macro being defined. | |
3708 | DECL is a list `(declare ...)' containing the declarations. | |
3709 | The value the function returns is not used. */); | |
3710 | Vmacro_declaration_function = Qnil; | |
3711 | ||
6e6e9f08 RS |
3712 | Vrun_hooks = intern ("run-hooks"); |
3713 | staticpro (&Vrun_hooks); | |
db9f0278 JB |
3714 | |
3715 | staticpro (&Vautoload_queue); | |
3716 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3717 | staticpro (&Vsignaling_function); |
3718 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3719 | |
3720 | defsubr (&Sor); | |
3721 | defsubr (&Sand); | |
3722 | defsubr (&Sif); | |
3723 | defsubr (&Scond); | |
3724 | defsubr (&Sprogn); | |
3725 | defsubr (&Sprog1); | |
3726 | defsubr (&Sprog2); | |
3727 | defsubr (&Ssetq); | |
3728 | defsubr (&Squote); | |
3729 | defsubr (&Sfunction); | |
3730 | defsubr (&Sdefun); | |
3731 | defsubr (&Sdefmacro); | |
3732 | defsubr (&Sdefvar); | |
19cebf5a | 3733 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3734 | defsubr (&Sdefconst); |
3735 | defsubr (&Suser_variable_p); | |
3736 | defsubr (&Slet); | |
3737 | defsubr (&SletX); | |
3738 | defsubr (&Swhile); | |
3739 | defsubr (&Smacroexpand); | |
3740 | defsubr (&Scatch); | |
3741 | defsubr (&Sthrow); | |
3742 | defsubr (&Sunwind_protect); | |
3743 | defsubr (&Scondition_case); | |
3744 | defsubr (&Ssignal); | |
3745 | defsubr (&Sinteractive_p); | |
4b664e76 | 3746 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
3747 | defsubr (&Scommandp); |
3748 | defsubr (&Sautoload); | |
3749 | defsubr (&Seval); | |
3750 | defsubr (&Sapply); | |
3751 | defsubr (&Sfuncall); | |
ff936e53 SM |
3752 | defsubr (&Srun_hooks); |
3753 | defsubr (&Srun_hook_with_args); | |
3754 | defsubr (&Srun_hook_with_args_until_success); | |
3755 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 3756 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3757 | defsubr (&Sbacktrace_debug); |
3758 | defsubr (&Sbacktrace); | |
3759 | defsubr (&Sbacktrace_frame); | |
3760 | } | |
ab5796a9 MB |
3761 | |
3762 | /* arch-tag: 014a07aa-33ab-4a8f-a3d2-ee8a4a9ff7fb | |
3763 | (do not change this comment) */ |