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 | ||
9ec0b715 | 8 | GNU Emacs is free software: you can redistribute it and/or modify |
db9f0278 | 9 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
db9f0278 JB |
12 | |
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
db9f0278 JB |
20 | |
21 | ||
18160b98 | 22 | #include <config.h> |
db9f0278 | 23 | #include "lisp.h" |
9ac0d9e0 | 24 | #include "blockinput.h" |
db9f0278 | 25 | #include "commands.h" |
1f98fa48 | 26 | #include "keyboard.h" |
3648c842 | 27 | #include "dispextern.h" |
db9f0278 JB |
28 | #include <setjmp.h> |
29 | ||
b70e1a2b SM |
30 | #if HAVE_X_WINDOWS |
31 | #include "xterm.h" | |
32 | #endif | |
33 | ||
db9f0278 JB |
34 | /* This definition is duplicated in alloc.c and keyboard.c */ |
35 | /* Putting it in lisp.h makes cc bomb out! */ | |
36 | ||
37 | struct backtrace | |
4c576a83 GM |
38 | { |
39 | struct backtrace *next; | |
40 | Lisp_Object *function; | |
41 | Lisp_Object *args; /* Points to vector of args. */ | |
42 | int nargs; /* Length of vector. | |
daa37602 JB |
43 | If nargs is UNEVALLED, args points to slot holding |
44 | list of unevalled args */ | |
4c576a83 GM |
45 | char evalargs; |
46 | /* Nonzero means call value of debugger when done with this operation. */ | |
47 | char debug_on_exit; | |
48 | }; | |
db9f0278 JB |
49 | |
50 | struct backtrace *backtrace_list; | |
51 | ||
82da7701 JB |
52 | /* This structure helps implement the `catch' and `throw' control |
53 | structure. A struct catchtag contains all the information needed | |
54 | to restore the state of the interpreter after a non-local jump. | |
55 | ||
56 | Handlers for error conditions (represented by `struct handler' | |
57 | structures) just point to a catch tag to do the cleanup required | |
58 | for their jumps. | |
59 | ||
60 | catchtag structures are chained together in the C calling stack; | |
61 | the `next' member points to the next outer catchtag. | |
62 | ||
63 | A call like (throw TAG VAL) searches for a catchtag whose `tag' | |
64 | member is TAG, and then unbinds to it. The `val' member is used to | |
65 | hold VAL while the stack is unwound; `val' is returned as the value | |
66 | of the catch form. | |
67 | ||
68 | All the other members are concerned with restoring the interpreter | |
69 | state. */ | |
4c576a83 | 70 | |
db9f0278 | 71 | struct catchtag |
4c576a83 GM |
72 | { |
73 | Lisp_Object tag; | |
74 | Lisp_Object val; | |
75 | struct catchtag *next; | |
76 | struct gcpro *gcpro; | |
77 | jmp_buf jmp; | |
78 | struct backtrace *backlist; | |
79 | struct handler *handlerlist; | |
80 | int lisp_eval_depth; | |
81 | int pdlcount; | |
82 | int poll_suppress_count; | |
2659a09f | 83 | int interrupt_input_blocked; |
4c576a83 GM |
84 | struct byte_stack *byte_stack; |
85 | }; | |
db9f0278 JB |
86 | |
87 | struct catchtag *catchlist; | |
88 | ||
15934ffa RS |
89 | #ifdef DEBUG_GCPRO |
90 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
91 | int gcpro_level; | |
92 | #endif | |
93 | ||
6fd797f5 | 94 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
ad236261 | 95 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
db9f0278 JB |
96 | Lisp_Object Qand_rest, Qand_optional; |
97 | Lisp_Object Qdebug_on_error; | |
d6edd563 | 98 | Lisp_Object Qdeclare; |
f01cbfdd | 99 | Lisp_Object Qdebug; |
db9f0278 | 100 | |
6e6e9f08 RS |
101 | /* This holds either the symbol `run-hooks' or nil. |
102 | It is nil at an early stage of startup, and when Emacs | |
103 | is shutting down. */ | |
4c576a83 | 104 | |
db9f0278 JB |
105 | Lisp_Object Vrun_hooks; |
106 | ||
107 | /* Non-nil means record all fset's and provide's, to be undone | |
108 | if the file being autoloaded is not fully loaded. | |
109 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 110 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
111 | |
112 | Lisp_Object Vautoload_queue; | |
113 | ||
114 | /* Current number of specbindings allocated in specpdl. */ | |
4c576a83 | 115 | |
db9f0278 JB |
116 | int specpdl_size; |
117 | ||
118 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 119 | |
db9f0278 JB |
120 | struct specbinding *specpdl; |
121 | ||
122 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 123 | |
ab837828 | 124 | struct specbinding *specpdl_ptr; |
db9f0278 JB |
125 | |
126 | /* Maximum size allowed for specpdl allocation */ | |
4c576a83 | 127 | |
31ade731 | 128 | EMACS_INT max_specpdl_size; |
db9f0278 JB |
129 | |
130 | /* Depth in Lisp evaluations and function calls. */ | |
4c576a83 | 131 | |
db9f0278 JB |
132 | int lisp_eval_depth; |
133 | ||
134 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
4c576a83 | 135 | |
31ade731 | 136 | EMACS_INT max_lisp_eval_depth; |
db9f0278 JB |
137 | |
138 | /* Nonzero means enter debugger before next function call */ | |
4c576a83 | 139 | |
db9f0278 JB |
140 | int debug_on_next_call; |
141 | ||
1b1acc13 | 142 | /* Non-zero means debugger may continue. This is zero when the |
556d7314 GM |
143 | debugger is called during redisplay, where it might not be safe to |
144 | continue the interrupted redisplay. */ | |
145 | ||
146 | int debugger_may_continue; | |
147 | ||
128c0f66 | 148 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 149 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 150 | |
128c0f66 | 151 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 152 | |
128c0f66 | 153 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 154 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 155 | |
128c0f66 | 156 | Lisp_Object Vdebug_on_error; |
db9f0278 | 157 | |
fc950e09 | 158 | /* List of conditions and regexps specifying error messages which |
1b1acc13 | 159 | do not enter the debugger even if Vdebug_on_error says they should. */ |
4c576a83 | 160 | |
fc950e09 KH |
161 | Lisp_Object Vdebug_ignored_errors; |
162 | ||
61ede770 | 163 | /* Non-nil means call the debugger even if the error will be handled. */ |
4c576a83 | 164 | |
57a6e758 | 165 | Lisp_Object Vdebug_on_signal; |
61ede770 RS |
166 | |
167 | /* Hook for edebug to use. */ | |
4c576a83 | 168 | |
61ede770 RS |
169 | Lisp_Object Vsignal_hook_function; |
170 | ||
db9f0278 | 171 | /* Nonzero means enter debugger if a quit signal |
128c0f66 | 172 | is handled by the command loop's error handler. */ |
4c576a83 | 173 | |
db9f0278 JB |
174 | int debug_on_quit; |
175 | ||
be857679 | 176 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 177 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 178 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
179 | know that the debugger itself has an error, and we should just |
180 | signal the error instead of entering an infinite loop of debugger | |
181 | invocations. */ | |
4c576a83 | 182 | |
82da7701 | 183 | int when_entered_debugger; |
db9f0278 JB |
184 | |
185 | Lisp_Object Vdebugger; | |
186 | ||
a2ff3819 GM |
187 | /* The function from which the last `signal' was called. Set in |
188 | Fsignal. */ | |
189 | ||
190 | Lisp_Object Vsignaling_function; | |
191 | ||
4c576a83 GM |
192 | /* Set to non-zero while processing X events. Checked in Feval to |
193 | make sure the Lisp interpreter isn't called from a signal handler, | |
194 | which is unsafe because the interpreter isn't reentrant. */ | |
195 | ||
196 | int handling_signal; | |
197 | ||
d6edd563 GM |
198 | /* Function to process declarations in defmacro forms. */ |
199 | ||
200 | Lisp_Object Vmacro_declaration_function; | |
201 | ||
873759d5 | 202 | extern Lisp_Object Qrisky_local_variable; |
d6edd563 | 203 | |
1283140e RS |
204 | extern Lisp_Object Qfunction; |
205 | ||
2901f1d1 | 206 | static Lisp_Object funcall_lambda P_ ((Lisp_Object, int, Lisp_Object*)); |
2381d38d | 207 | static void unwind_to_catch P_ ((struct catchtag *, Lisp_Object)) NO_RETURN; |
eaa1e5ed EZ |
208 | |
209 | #if __GNUC__ | |
210 | /* "gcc -O3" enables automatic function inlining, which optimizes out | |
211 | the arguments for the invocations of these functions, whereas they | |
212 | expect these values on the stack. */ | |
213 | Lisp_Object apply1 () __attribute__((noinline)); | |
214 | Lisp_Object call2 () __attribute__((noinline)); | |
215 | #endif | |
873759d5 | 216 | \f |
dfcf069d | 217 | void |
db9f0278 JB |
218 | init_eval_once () |
219 | { | |
220 | specpdl_size = 50; | |
716acfce | 221 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 222 | specpdl_ptr = specpdl; |
6588243d | 223 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
a4547405 | 224 | max_specpdl_size = 1000; |
be436d23 | 225 | max_lisp_eval_depth = 400; |
34d470ba RS |
226 | |
227 | Vrun_hooks = Qnil; | |
db9f0278 JB |
228 | } |
229 | ||
dfcf069d | 230 | void |
db9f0278 JB |
231 | init_eval () |
232 | { | |
233 | specpdl_ptr = specpdl; | |
234 | catchlist = 0; | |
235 | handlerlist = 0; | |
236 | backtrace_list = 0; | |
237 | Vquit_flag = Qnil; | |
238 | debug_on_next_call = 0; | |
239 | lisp_eval_depth = 0; | |
87e21fbd | 240 | #ifdef DEBUG_GCPRO |
15934ffa | 241 | gcpro_level = 0; |
87e21fbd | 242 | #endif |
be857679 | 243 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 244 | when_entered_debugger = -1; |
db9f0278 JB |
245 | } |
246 | ||
9f5903bb RS |
247 | /* unwind-protect function used by call_debugger. */ |
248 | ||
249 | static Lisp_Object | |
250 | restore_stack_limits (data) | |
251 | Lisp_Object data; | |
252 | { | |
253 | max_specpdl_size = XINT (XCAR (data)); | |
254 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 255 | return Qnil; |
9f5903bb RS |
256 | } |
257 | ||
258 | /* Call the Lisp debugger, giving it argument ARG. */ | |
259 | ||
db9f0278 JB |
260 | Lisp_Object |
261 | call_debugger (arg) | |
262 | Lisp_Object arg; | |
263 | { | |
3648c842 | 264 | int debug_while_redisplaying; |
aed13378 | 265 | int count = SPECPDL_INDEX (); |
3648c842 | 266 | Lisp_Object val; |
9f5903bb | 267 | int old_max = max_specpdl_size; |
177c0ea7 | 268 | |
9f5903bb RS |
269 | /* Temporarily bump up the stack limits, |
270 | so the debugger won't run out of stack. */ | |
177c0ea7 | 271 | |
9f5903bb RS |
272 | max_specpdl_size += 1; |
273 | record_unwind_protect (restore_stack_limits, | |
274 | Fcons (make_number (old_max), | |
275 | make_number (max_lisp_eval_depth))); | |
276 | max_specpdl_size = old_max; | |
277 | ||
278 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
279 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
280 | ||
281 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
282 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 283 | |
d148e14d | 284 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
285 | if (display_hourglass_p) |
286 | cancel_hourglass (); | |
237c23b0 GM |
287 | #endif |
288 | ||
db9f0278 | 289 | debug_on_next_call = 0; |
be857679 | 290 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
291 | |
292 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
293 | displayed if the debugger is invoked during redisplay. */ | |
294 | debug_while_redisplaying = redisplaying_p; | |
295 | redisplaying_p = 0; | |
556d7314 GM |
296 | specbind (intern ("debugger-may-continue"), |
297 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 298 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 299 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
300 | |
301 | #if 0 /* Binding this prevents execution of Lisp code during | |
302 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 303 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 304 | #endif |
177c0ea7 | 305 | |
3648c842 GM |
306 | val = apply1 (Vdebugger, arg); |
307 | ||
308 | /* Interrupting redisplay and resuming it later is not safe under | |
309 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 310 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
311 | if (debug_while_redisplaying) |
312 | Ftop_level (); | |
313 | ||
556d7314 | 314 | return unbind_to (count, val); |
db9f0278 JB |
315 | } |
316 | ||
dfcf069d | 317 | void |
db9f0278 JB |
318 | do_debug_on_call (code) |
319 | Lisp_Object code; | |
320 | { | |
321 | debug_on_next_call = 0; | |
322 | backtrace_list->debug_on_exit = 1; | |
323 | call_debugger (Fcons (code, Qnil)); | |
324 | } | |
325 | \f | |
326 | /* NOTE!!! Every function that can call EVAL must protect its args | |
327 | and temporaries from garbage collection while it needs them. | |
328 | The definition of `For' shows what you have to do. */ | |
329 | ||
330 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
331 | doc: /* Eval args until one of them yields non-nil, then return that value. |
332 | The remaining args are not evalled at all. | |
333 | If all args return nil, return nil. | |
533eb34b | 334 | usage: (or CONDITIONS...) */) |
9dbc9081 | 335 | (args) |
db9f0278 JB |
336 | Lisp_Object args; |
337 | { | |
e509f168 | 338 | register Lisp_Object val = Qnil; |
db9f0278 JB |
339 | struct gcpro gcpro1; |
340 | ||
e509f168 | 341 | GCPRO1 (args); |
db9f0278 | 342 | |
e509f168 | 343 | while (CONSP (args)) |
db9f0278 | 344 | { |
e509f168 | 345 | val = Feval (XCAR (args)); |
265a9e55 | 346 | if (!NILP (val)) |
db9f0278 | 347 | break; |
e509f168 | 348 | args = XCDR (args); |
db9f0278 | 349 | } |
db9f0278 JB |
350 | |
351 | UNGCPRO; | |
352 | return val; | |
353 | } | |
354 | ||
355 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 356 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
357 | The remaining args are not evalled at all. |
358 | If no arg yields nil, return the last arg's value. | |
533eb34b | 359 | usage: (and CONDITIONS...) */) |
9dbc9081 | 360 | (args) |
db9f0278 JB |
361 | Lisp_Object args; |
362 | { | |
e509f168 | 363 | register Lisp_Object val = Qt; |
db9f0278 JB |
364 | struct gcpro gcpro1; |
365 | ||
e509f168 | 366 | GCPRO1 (args); |
db9f0278 | 367 | |
e509f168 | 368 | while (CONSP (args)) |
db9f0278 | 369 | { |
e509f168 | 370 | val = Feval (XCAR (args)); |
265a9e55 | 371 | if (NILP (val)) |
db9f0278 | 372 | break; |
e509f168 | 373 | args = XCDR (args); |
db9f0278 | 374 | } |
db9f0278 JB |
375 | |
376 | UNGCPRO; | |
377 | return val; | |
378 | } | |
379 | ||
380 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 381 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
382 | Returns the value of THEN or the value of the last of the ELSE's. |
383 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
384 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 385 | usage: (if COND THEN ELSE...) */) |
9dbc9081 | 386 | (args) |
db9f0278 JB |
387 | Lisp_Object args; |
388 | { | |
389 | register Lisp_Object cond; | |
390 | struct gcpro gcpro1; | |
391 | ||
392 | GCPRO1 (args); | |
393 | cond = Feval (Fcar (args)); | |
394 | UNGCPRO; | |
395 | ||
265a9e55 | 396 | if (!NILP (cond)) |
db9f0278 JB |
397 | return Feval (Fcar (Fcdr (args))); |
398 | return Fprogn (Fcdr (Fcdr (args))); | |
399 | } | |
400 | ||
401 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
402 | doc: /* Try each clause until one succeeds. |
403 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
404 | and, if the value is non-nil, this clause succeeds: | |
405 | then the expressions in BODY are evaluated and the last one's | |
406 | value is the value of the cond-form. | |
407 | If no clause succeeds, cond returns nil. | |
408 | If a clause has one element, as in (CONDITION), | |
409 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 410 | usage: (cond CLAUSES...) */) |
9dbc9081 | 411 | (args) |
db9f0278 JB |
412 | Lisp_Object args; |
413 | { | |
414 | register Lisp_Object clause, val; | |
415 | struct gcpro gcpro1; | |
416 | ||
417 | val = Qnil; | |
418 | GCPRO1 (args); | |
265a9e55 | 419 | while (!NILP (args)) |
db9f0278 JB |
420 | { |
421 | clause = Fcar (args); | |
422 | val = Feval (Fcar (clause)); | |
265a9e55 | 423 | if (!NILP (val)) |
db9f0278 | 424 | { |
03699b14 KR |
425 | if (!EQ (XCDR (clause), Qnil)) |
426 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
427 | break; |
428 | } | |
03699b14 | 429 | args = XCDR (args); |
db9f0278 JB |
430 | } |
431 | UNGCPRO; | |
432 | ||
433 | return val; | |
434 | } | |
435 | ||
436 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
9dbc9081 | 437 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 438 | usage: (progn BODY...) */) |
9dbc9081 | 439 | (args) |
db9f0278 JB |
440 | Lisp_Object args; |
441 | { | |
e509f168 | 442 | register Lisp_Object val = Qnil; |
db9f0278 JB |
443 | struct gcpro gcpro1; |
444 | ||
e509f168 | 445 | GCPRO1 (args); |
db9f0278 | 446 | |
e509f168 | 447 | while (CONSP (args)) |
db9f0278 | 448 | { |
e509f168 SM |
449 | val = Feval (XCAR (args)); |
450 | args = XCDR (args); | |
db9f0278 | 451 | } |
db9f0278 JB |
452 | |
453 | UNGCPRO; | |
454 | return val; | |
455 | } | |
456 | ||
457 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
458 | doc: /* Eval FIRST and BODY sequentially; value from FIRST. |
459 | The value of FIRST is saved during the evaluation of the remaining args, | |
460 | whose values are discarded. | |
7a25dc6d | 461 | usage: (prog1 FIRST BODY...) */) |
9dbc9081 | 462 | (args) |
db9f0278 JB |
463 | Lisp_Object args; |
464 | { | |
465 | Lisp_Object val; | |
466 | register Lisp_Object args_left; | |
467 | struct gcpro gcpro1, gcpro2; | |
468 | register int argnum = 0; | |
469 | ||
9ac66b45 | 470 | if (NILP (args)) |
db9f0278 JB |
471 | return Qnil; |
472 | ||
473 | args_left = args; | |
474 | val = Qnil; | |
475 | GCPRO2 (args, val); | |
476 | ||
477 | do | |
478 | { | |
479 | if (!(argnum++)) | |
480 | val = Feval (Fcar (args_left)); | |
481 | else | |
482 | Feval (Fcar (args_left)); | |
483 | args_left = Fcdr (args_left); | |
484 | } | |
265a9e55 | 485 | while (!NILP(args_left)); |
db9f0278 JB |
486 | |
487 | UNGCPRO; | |
488 | return val; | |
489 | } | |
490 | ||
491 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
82fc29a1 JB |
492 | doc: /* Eval FORM1, FORM2 and BODY sequentially; value from FORM2. |
493 | The value of FORM2 is saved during the evaluation of the | |
494 | remaining args, whose values are discarded. | |
495 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
9dbc9081 | 496 | (args) |
db9f0278 JB |
497 | Lisp_Object args; |
498 | { | |
499 | Lisp_Object val; | |
500 | register Lisp_Object args_left; | |
501 | struct gcpro gcpro1, gcpro2; | |
502 | register int argnum = -1; | |
503 | ||
504 | val = Qnil; | |
505 | ||
87d238ba | 506 | if (NILP (args)) |
db9f0278 JB |
507 | return Qnil; |
508 | ||
509 | args_left = args; | |
510 | val = Qnil; | |
511 | GCPRO2 (args, val); | |
512 | ||
513 | do | |
514 | { | |
515 | if (!(argnum++)) | |
516 | val = Feval (Fcar (args_left)); | |
517 | else | |
518 | Feval (Fcar (args_left)); | |
519 | args_left = Fcdr (args_left); | |
520 | } | |
87d238ba | 521 | while (!NILP (args_left)); |
db9f0278 JB |
522 | |
523 | UNGCPRO; | |
524 | return val; | |
525 | } | |
526 | ||
527 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
528 | doc: /* Set each SYM to the value of its VAL. |
529 | The symbols SYM are variables; they are literal (not evaluated). | |
530 | The values VAL are expressions; they are evaluated. | |
531 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
532 | The second VAL is not computed until after the first SYM is set, and so on; | |
533 | each VAL can use the new value of variables set earlier in the `setq'. | |
534 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 535 | usage: (setq [SYM VAL]...) */) |
9dbc9081 | 536 | (args) |
db9f0278 JB |
537 | Lisp_Object args; |
538 | { | |
539 | register Lisp_Object args_left; | |
540 | register Lisp_Object val, sym; | |
541 | struct gcpro gcpro1; | |
542 | ||
1283140e | 543 | if (NILP (args)) |
db9f0278 JB |
544 | return Qnil; |
545 | ||
546 | args_left = args; | |
547 | GCPRO1 (args); | |
548 | ||
549 | do | |
550 | { | |
551 | val = Feval (Fcar (Fcdr (args_left))); | |
552 | sym = Fcar (args_left); | |
553 | Fset (sym, val); | |
554 | args_left = Fcdr (Fcdr (args_left)); | |
555 | } | |
265a9e55 | 556 | while (!NILP(args_left)); |
db9f0278 JB |
557 | |
558 | UNGCPRO; | |
559 | return val; | |
560 | } | |
177c0ea7 | 561 | |
db9f0278 | 562 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
563 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
564 | usage: (quote ARG) */) | |
565 | (args) | |
db9f0278 JB |
566 | Lisp_Object args; |
567 | { | |
1283140e RS |
568 | if (!NILP (Fcdr (args))) |
569 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
570 | return Fcar (args); |
571 | } | |
177c0ea7 | 572 | |
db9f0278 | 573 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
574 | doc: /* Like `quote', but preferred for objects which are functions. |
575 | In byte compilation, `function' causes its argument to be compiled. | |
576 | `quote' cannot do that. | |
577 | usage: (function ARG) */) | |
578 | (args) | |
db9f0278 JB |
579 | Lisp_Object args; |
580 | { | |
1283140e RS |
581 | if (!NILP (Fcdr (args))) |
582 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
db9f0278 JB |
583 | return Fcar (args); |
584 | } | |
585 | ||
e0f331ab | 586 | |
db9f0278 | 587 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
c63df42b | 588 | doc: /* Return t if the function was run directly by user input. |
82fc29a1 JB |
589 | This means that the function was called with `call-interactively' |
590 | \(which includes being called as the binding of a key) | |
c63df42b RS |
591 | and input is currently coming from the keyboard (not in keyboard macro), |
592 | and Emacs is not running in batch mode (`noninteractive' is nil). | |
593 | ||
594 | The only known proper use of `interactive-p' is in deciding whether to | |
595 | display a helpful message, or how to display it. If you're thinking | |
596 | of using it for any other purpose, it is quite likely that you're | |
597 | making a mistake. Think: what do you want to do when the command is | |
598 | called from a keyboard macro? | |
599 | ||
600 | If you want to test whether your function was called with | |
601 | `call-interactively', the way to do that is by adding an extra | |
602 | optional argument, and making the `interactive' spec specify non-nil | |
603 | unconditionally for that argument. (`p' is a good way to do this.) */) | |
9dbc9081 | 604 | () |
db9f0278 | 605 | { |
c63df42b | 606 | return (INTERACTIVE && interactive_p (1)) ? Qt : Qnil; |
e0f331ab GM |
607 | } |
608 | ||
609 | ||
4b664e76 | 610 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 0, 0, |
82fc29a1 | 611 | doc: /* Return t if the function using this was called with `call-interactively'. |
c63df42b RS |
612 | This is used for implementing advice and other function-modifying |
613 | features of Emacs. | |
614 | ||
615 | The cleanest way to test whether your function was called with | |
82fc29a1 JB |
616 | `call-interactively' is by adding an extra optional argument, |
617 | and making the `interactive' spec specify non-nil unconditionally | |
618 | for that argument. (`p' is a good way to do this.) */) | |
c63df42b RS |
619 | () |
620 | { | |
0b31741c | 621 | return interactive_p (1) ? Qt : Qnil; |
c63df42b RS |
622 | } |
623 | ||
624 | ||
625 | /* Return 1 if function in which this appears was called using | |
626 | call-interactively. | |
e0f331ab GM |
627 | |
628 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
629 | called is a built-in. */ | |
630 | ||
631 | int | |
632 | interactive_p (exclude_subrs_p) | |
633 | int exclude_subrs_p; | |
634 | { | |
635 | struct backtrace *btp; | |
636 | Lisp_Object fun; | |
db9f0278 | 637 | |
db9f0278 | 638 | btp = backtrace_list; |
daa37602 JB |
639 | |
640 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 641 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 642 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
643 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
644 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 645 | btp = btp->next; |
daa37602 JB |
646 | |
647 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
648 | may be a frame for Fbytecode at the top level. In any version of |
649 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
650 | inside catch and condition-case. Skip past them. | |
daa37602 | 651 | |
4402a9ed | 652 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 653 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
654 | while (btp |
655 | && (EQ (*btp->function, Qbytecode) | |
656 | || btp->nargs == UNEVALLED)) | |
a6e3fa71 JB |
657 | btp = btp->next; |
658 | ||
daa37602 JB |
659 | /* btp now points at the frame of the innermost function that isn't |
660 | a special form, ignoring frames for Finteractive_p and/or | |
661 | Fbytecode at the top. If this frame is for a built-in function | |
662 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 663 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
664 | if (exclude_subrs_p && SUBRP (fun)) |
665 | return 0; | |
177c0ea7 | 666 | |
db9f0278 JB |
667 | /* btp points to the frame of a Lisp function that called interactive-p. |
668 | Return t if that function was called interactively. */ | |
669 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
670 | return 1; |
671 | return 0; | |
db9f0278 JB |
672 | } |
673 | ||
e0f331ab | 674 | |
db9f0278 | 675 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
676 | doc: /* Define NAME as a function. |
677 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
678 | See also the function `interactive'. | |
7a25dc6d | 679 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
9dbc9081 | 680 | (args) |
db9f0278 JB |
681 | Lisp_Object args; |
682 | { | |
683 | register Lisp_Object fn_name; | |
684 | register Lisp_Object defn; | |
685 | ||
686 | fn_name = Fcar (args); | |
6992a868 | 687 | CHECK_SYMBOL (fn_name); |
db9f0278 | 688 | defn = Fcons (Qlambda, Fcdr (args)); |
265a9e55 | 689 | if (!NILP (Vpurify_flag)) |
db9f0278 | 690 | defn = Fpurecopy (defn); |
f58e9f8c RS |
691 | if (CONSP (XSYMBOL (fn_name)->function) |
692 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
693 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 694 | Ffset (fn_name, defn); |
6fd797f5 | 695 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
696 | return fn_name; |
697 | } | |
698 | ||
699 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 700 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
701 | The actual definition looks like |
702 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
703 | When the macro is called, as in (NAME ARGS...), |
704 | the function (lambda ARGLIST BODY...) is applied to | |
705 | the list ARGS... as it appears in the expression, | |
706 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
707 | |
708 | DECL is a declaration, optional, which can specify how to indent | |
709 | calls to this macro and how Edebug should handle it. It looks like this: | |
710 | (declare SPECS...) | |
711 | The elements can look like this: | |
712 | (indent INDENT) | |
713 | Set NAME's `lisp-indent-function' property to INDENT. | |
714 | ||
e509f168 | 715 | (debug DEBUG) |
0654d6e3 | 716 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 717 | equivalent to writing a `def-edebug-spec' for the macro.) |
0654d6e3 | 718 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
9dbc9081 | 719 | (args) |
db9f0278 JB |
720 | Lisp_Object args; |
721 | { | |
722 | register Lisp_Object fn_name; | |
723 | register Lisp_Object defn; | |
d6edd563 | 724 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
725 | |
726 | fn_name = Fcar (args); | |
8e975df9 | 727 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
728 | lambda_list = Fcar (Fcdr (args)); |
729 | tail = Fcdr (Fcdr (args)); | |
730 | ||
731 | doc = Qnil; | |
732 | if (STRINGP (Fcar (tail))) | |
733 | { | |
e509f168 SM |
734 | doc = XCAR (tail); |
735 | tail = XCDR (tail); | |
d6edd563 GM |
736 | } |
737 | ||
738 | while (CONSP (Fcar (tail)) | |
739 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
740 | { | |
741 | if (!NILP (Vmacro_declaration_function)) | |
742 | { | |
743 | struct gcpro gcpro1; | |
744 | GCPRO1 (args); | |
745 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
746 | UNGCPRO; | |
747 | } | |
177c0ea7 | 748 | |
d6edd563 GM |
749 | tail = Fcdr (tail); |
750 | } | |
751 | ||
752 | if (NILP (doc)) | |
753 | tail = Fcons (lambda_list, tail); | |
754 | else | |
755 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
756 | defn = Fcons (Qmacro, Fcons (Qlambda, tail)); | |
177c0ea7 | 757 | |
265a9e55 | 758 | if (!NILP (Vpurify_flag)) |
db9f0278 | 759 | defn = Fpurecopy (defn); |
f58e9f8c RS |
760 | if (CONSP (XSYMBOL (fn_name)->function) |
761 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
762 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 763 | Ffset (fn_name, defn); |
6fd797f5 | 764 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
765 | return fn_name; |
766 | } | |
767 | ||
19cebf5a | 768 | |
1848d15d | 769 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 770 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 771 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 772 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
773 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
774 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
775 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
776 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 JB |
777 | The return value is BASE-VARIABLE. */) |
778 | (new_alias, base_variable, docstring) | |
779 | Lisp_Object new_alias, base_variable, docstring; | |
19cebf5a GM |
780 | { |
781 | struct Lisp_Symbol *sym; | |
1848d15d | 782 | |
4a9308b8 JB |
783 | CHECK_SYMBOL (new_alias); |
784 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 785 | |
4a9308b8 | 786 | if (SYMBOL_CONSTANT_P (new_alias)) |
19cebf5a GM |
787 | error ("Cannot make a constant an alias"); |
788 | ||
4a9308b8 | 789 | sym = XSYMBOL (new_alias); |
dd60787c GM |
790 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
791 | If n_a is bound, but b_v is not, set the value of b_v to n_a. | |
792 | This is for the sake of define-obsolete-variable-alias and user | |
793 | customizations. */ | |
794 | if (NILP (Fboundp (base_variable)) && !NILP (Fboundp (new_alias))) | |
795 | XSYMBOL(base_variable)->value = sym->value; | |
19cebf5a | 796 | sym->indirect_variable = 1; |
4a9308b8 JB |
797 | sym->value = base_variable; |
798 | sym->constant = SYMBOL_CONSTANT_P (base_variable); | |
799 | LOADHIST_ATTACH (new_alias); | |
1848d15d | 800 | if (!NILP (docstring)) |
4a9308b8 | 801 | Fput (new_alias, Qvariable_documentation, docstring); |
bd81fcf8 | 802 | else |
4a9308b8 | 803 | Fput (new_alias, Qvariable_documentation, Qnil); |
1848d15d | 804 | |
4a9308b8 | 805 | return base_variable; |
19cebf5a GM |
806 | } |
807 | ||
808 | ||
db9f0278 | 809 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 810 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
811 | You are not required to define a variable in order to use it, |
812 | but the definition can supply documentation and an initial value | |
813 | in a way that tags can recognize. | |
814 | ||
815 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
816 | If SYMBOL is buffer-local, its default value is what is set; | |
817 | buffer-local values are not affected. | |
818 | INITVALUE and DOCSTRING are optional. | |
819 | If DOCSTRING starts with *, this variable is identified as a user option. | |
820 | This means that M-x set-variable recognizes it. | |
821 | See also `user-variable-p'. | |
822 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
823 | |
824 | If SYMBOL has a local binding, then this form affects the local | |
825 | binding. This is usually not what you want. Thus, if you need to | |
826 | load a file defining variables, with this form or with `defconst' or | |
827 | `defcustom', you should always load that file _outside_ any bindings | |
828 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
829 | this respect.) | |
2df5238c | 830 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
9dbc9081 | 831 | (args) |
db9f0278 JB |
832 | Lisp_Object args; |
833 | { | |
a42ba017 | 834 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
835 | |
836 | sym = Fcar (args); | |
a42ba017 RS |
837 | tail = Fcdr (args); |
838 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 839 | error ("Too many arguments"); |
a42ba017 | 840 | |
33568849 | 841 | tem = Fdefault_boundp (sym); |
a42ba017 | 842 | if (!NILP (tail)) |
db9f0278 | 843 | { |
1c9916a1 SM |
844 | if (SYMBOL_CONSTANT_P (sym)) |
845 | { | |
846 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
847 | Lisp_Object tem = Fcar (tail); | |
848 | if (! (CONSP (tem) | |
849 | && EQ (XCAR (tem), Qquote) | |
850 | && CONSP (XCDR (tem)) | |
851 | && EQ (XCAR (XCDR (tem)), sym))) | |
852 | error ("Constant symbol `%s' specified in defvar", | |
853 | SDATA (SYMBOL_NAME (sym))); | |
854 | } | |
855 | ||
265a9e55 | 856 | if (NILP (tem)) |
33568849 | 857 | Fset_default (sym, Feval (Fcar (tail))); |
d0bce91e SM |
858 | else |
859 | { /* Check if there is really a global binding rather than just a let | |
860 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 861 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
862 | while (--pdl >= specpdl) |
863 | { | |
864 | if (EQ (pdl->symbol, sym) && !pdl->func | |
865 | && EQ (pdl->old_value, Qunbound)) | |
866 | { | |
867 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
868 | SYMBOL_NAME (sym), 1); | |
869 | break; | |
870 | } | |
871 | } | |
872 | } | |
33568849 | 873 | tail = Fcdr (tail); |
e509f168 SM |
874 | tem = Fcar (tail); |
875 | if (!NILP (tem)) | |
33568849 | 876 | { |
33568849 SM |
877 | if (!NILP (Vpurify_flag)) |
878 | tem = Fpurecopy (tem); | |
879 | Fput (sym, Qvariable_documentation, tem); | |
880 | } | |
6fd797f5 | 881 | LOADHIST_ATTACH (sym); |
db9f0278 | 882 | } |
33568849 | 883 | else |
d7c1d0fc RS |
884 | /* Simple (defvar <var>) should not count as a definition at all. |
885 | It could get in the way of other definitions, and unloading this | |
886 | package could try to make the variable unbound. */ | |
addf35fd AS |
887 | ; |
888 | ||
db9f0278 JB |
889 | return sym; |
890 | } | |
891 | ||
892 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
893 | doc: /* Define SYMBOL as a constant variable. |
894 | The intent is that neither programs nor users should ever change this value. | |
895 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
896 | If SYMBOL is buffer-local, its default value is what is set; | |
897 | buffer-local values are not affected. | |
898 | DOCSTRING is optional. | |
733f68b6 LT |
899 | |
900 | If SYMBOL has a local binding, then this form sets the local binding's | |
901 | value. However, you should normally not make local bindings for | |
902 | variables defined with this form. | |
7a25dc6d | 903 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
9dbc9081 | 904 | (args) |
db9f0278 JB |
905 | Lisp_Object args; |
906 | { | |
907 | register Lisp_Object sym, tem; | |
908 | ||
909 | sym = Fcar (args); | |
a42ba017 | 910 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 911 | error ("Too many arguments"); |
a42ba017 | 912 | |
1182a7cb DL |
913 | tem = Feval (Fcar (Fcdr (args))); |
914 | if (!NILP (Vpurify_flag)) | |
915 | tem = Fpurecopy (tem); | |
916 | Fset_default (sym, tem); | |
db9f0278 | 917 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 918 | if (!NILP (tem)) |
db9f0278 | 919 | { |
265a9e55 | 920 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
921 | tem = Fpurecopy (tem); |
922 | Fput (sym, Qvariable_documentation, tem); | |
923 | } | |
873759d5 | 924 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 925 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
926 | return sym; |
927 | } | |
928 | ||
606cdb89 JB |
929 | /* Error handler used in Fuser_variable_p. */ |
930 | static Lisp_Object | |
931 | user_variable_p_eh (ignore) | |
932 | Lisp_Object ignore; | |
933 | { | |
934 | return Qnil; | |
935 | } | |
936 | ||
db9f0278 | 937 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 938 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 939 | \(The alternative is a variable used internally in a Lisp program.) |
606cdb89 JB |
940 | A variable is a user variable if |
941 | \(1) the first character of its documentation is `*', or | |
942 | \(2) it is customizable (its property list contains a non-nil value | |
943 | of `standard-value' or `custom-autoload'), or | |
944 | \(3) it is an alias for another user variable. | |
945 | Return nil if VARIABLE is an alias and there is a loop in the | |
946 | chain of symbols. */) | |
9dbc9081 | 947 | (variable) |
db9f0278 JB |
948 | Lisp_Object variable; |
949 | { | |
950 | Lisp_Object documentation; | |
177c0ea7 | 951 | |
5e78e475 RS |
952 | if (!SYMBOLP (variable)) |
953 | return Qnil; | |
954 | ||
606cdb89 JB |
955 | /* If indirect and there's an alias loop, don't check anything else. */ |
956 | if (XSYMBOL (variable)->indirect_variable | |
957 | && NILP (internal_condition_case_1 (indirect_variable, variable, | |
958 | Qt, user_variable_p_eh))) | |
959 | return Qnil; | |
960 | ||
961 | while (1) | |
962 | { | |
963 | documentation = Fget (variable, Qvariable_documentation); | |
964 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
965 | return Qt; | |
966 | if (STRINGP (documentation) | |
967 | && ((unsigned char) SREF (documentation, 0) == '*')) | |
968 | return Qt; | |
969 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ | |
970 | if (CONSP (documentation) | |
971 | && STRINGP (XCAR (documentation)) | |
972 | && INTEGERP (XCDR (documentation)) | |
973 | && XINT (XCDR (documentation)) < 0) | |
974 | return Qt; | |
975 | /* Customizable? See `custom-variable-p'. */ | |
976 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
977 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) | |
978 | return Qt; | |
979 | ||
980 | if (!XSYMBOL (variable)->indirect_variable) | |
981 | return Qnil; | |
982 | ||
983 | /* An indirect variable? Let's follow the chain. */ | |
984 | variable = XSYMBOL (variable)->value; | |
985 | } | |
177c0ea7 | 986 | } |
db9f0278 JB |
987 | \f |
988 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
989 | doc: /* Bind variables according to VARLIST then eval BODY. |
990 | The value of the last form in BODY is returned. | |
991 | Each element of VARLIST is a symbol (which is bound to nil) | |
992 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
993 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 994 | usage: (let* VARLIST BODY...) */) |
9dbc9081 | 995 | (args) |
db9f0278 JB |
996 | Lisp_Object args; |
997 | { | |
998 | Lisp_Object varlist, val, elt; | |
aed13378 | 999 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
1000 | struct gcpro gcpro1, gcpro2, gcpro3; |
1001 | ||
1002 | GCPRO3 (args, elt, varlist); | |
1003 | ||
1004 | varlist = Fcar (args); | |
265a9e55 | 1005 | while (!NILP (varlist)) |
db9f0278 JB |
1006 | { |
1007 | QUIT; | |
1008 | elt = Fcar (varlist); | |
90165123 | 1009 | if (SYMBOLP (elt)) |
db9f0278 | 1010 | specbind (elt, Qnil); |
08564963 | 1011 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1012 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1013 | else |
1014 | { | |
1015 | val = Feval (Fcar (Fcdr (elt))); | |
1016 | specbind (Fcar (elt), val); | |
1017 | } | |
1018 | varlist = Fcdr (varlist); | |
1019 | } | |
1020 | UNGCPRO; | |
1021 | val = Fprogn (Fcdr (args)); | |
1022 | return unbind_to (count, val); | |
1023 | } | |
1024 | ||
1025 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1026 | doc: /* Bind variables according to VARLIST then eval BODY. |
1027 | The value of the last form in BODY is returned. | |
1028 | Each element of VARLIST is a symbol (which is bound to nil) | |
1029 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1030 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 1031 | usage: (let VARLIST BODY...) */) |
9dbc9081 | 1032 | (args) |
db9f0278 JB |
1033 | Lisp_Object args; |
1034 | { | |
1035 | Lisp_Object *temps, tem; | |
1036 | register Lisp_Object elt, varlist; | |
aed13378 | 1037 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
1038 | register int argnum; |
1039 | struct gcpro gcpro1, gcpro2; | |
1040 | ||
1041 | varlist = Fcar (args); | |
1042 | ||
1043 | /* Make space to hold the values to give the bound variables */ | |
1044 | elt = Flength (varlist); | |
1045 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
1046 | ||
1047 | /* Compute the values and store them in `temps' */ | |
1048 | ||
1049 | GCPRO2 (args, *temps); | |
1050 | gcpro2.nvars = 0; | |
1051 | ||
67ee9f6e | 1052 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
1053 | { |
1054 | QUIT; | |
67ee9f6e | 1055 | elt = XCAR (varlist); |
90165123 | 1056 | if (SYMBOLP (elt)) |
db9f0278 | 1057 | temps [argnum++] = Qnil; |
08564963 | 1058 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1059 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1060 | else |
1061 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
1062 | gcpro2.nvars = argnum; | |
1063 | } | |
1064 | UNGCPRO; | |
1065 | ||
1066 | varlist = Fcar (args); | |
67ee9f6e | 1067 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 1068 | { |
67ee9f6e | 1069 | elt = XCAR (varlist); |
db9f0278 | 1070 | tem = temps[argnum++]; |
90165123 | 1071 | if (SYMBOLP (elt)) |
db9f0278 JB |
1072 | specbind (elt, tem); |
1073 | else | |
1074 | specbind (Fcar (elt), tem); | |
1075 | } | |
1076 | ||
1077 | elt = Fprogn (Fcdr (args)); | |
1078 | return unbind_to (count, elt); | |
1079 | } | |
1080 | ||
1081 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1082 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1083 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1084 | until TEST returns nil. | |
7a25dc6d | 1085 | usage: (while TEST BODY...) */) |
9dbc9081 | 1086 | (args) |
db9f0278 JB |
1087 | Lisp_Object args; |
1088 | { | |
2b9bde76 | 1089 | Lisp_Object test, body; |
db9f0278 JB |
1090 | struct gcpro gcpro1, gcpro2; |
1091 | ||
1092 | GCPRO2 (test, body); | |
1093 | ||
1094 | test = Fcar (args); | |
1095 | body = Fcdr (args); | |
2b9bde76 | 1096 | while (!NILP (Feval (test))) |
db9f0278 JB |
1097 | { |
1098 | QUIT; | |
1099 | Fprogn (body); | |
1100 | } | |
1101 | ||
1102 | UNGCPRO; | |
1103 | return Qnil; | |
1104 | } | |
1105 | ||
1106 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1107 | doc: /* Return result of expanding macros at top level of FORM. |
1108 | If FORM is not a macro call, it is returned unchanged. | |
1109 | Otherwise, the macro is expanded and the expansion is considered | |
1110 | in place of FORM. When a non-macro-call results, it is returned. | |
1111 | ||
1112 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1113 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
1114 | (form, environment) | |
2e267a2e | 1115 | Lisp_Object form; |
79e8bfbf | 1116 | Lisp_Object environment; |
db9f0278 | 1117 | { |
23d6b5a6 | 1118 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1119 | register Lisp_Object expander, sym, def, tem; |
1120 | ||
1121 | while (1) | |
1122 | { | |
1123 | /* Come back here each time we expand a macro call, | |
1124 | in case it expands into another macro call. */ | |
90165123 | 1125 | if (!CONSP (form)) |
db9f0278 | 1126 | break; |
23d6b5a6 | 1127 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1128 | def = sym = XCAR (form); |
23d6b5a6 | 1129 | tem = Qnil; |
db9f0278 JB |
1130 | /* Trace symbols aliases to other symbols |
1131 | until we get a symbol that is not an alias. */ | |
90165123 | 1132 | while (SYMBOLP (def)) |
db9f0278 JB |
1133 | { |
1134 | QUIT; | |
23d6b5a6 | 1135 | sym = def; |
79e8bfbf | 1136 | tem = Fassq (sym, environment); |
265a9e55 | 1137 | if (NILP (tem)) |
db9f0278 JB |
1138 | { |
1139 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1140 | if (!EQ (def, Qunbound)) |
1141 | continue; | |
db9f0278 | 1142 | } |
23d6b5a6 | 1143 | break; |
db9f0278 | 1144 | } |
79e8bfbf | 1145 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1146 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1147 | if (NILP (tem)) |
db9f0278 | 1148 | { |
79e8bfbf | 1149 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1150 | Look at its function definition. */ |
90165123 | 1151 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
1152 | /* Not defined or definition not suitable */ |
1153 | break; | |
03699b14 | 1154 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1155 | { |
1156 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1157 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1158 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1159 | /* Yes, load it and try again. */ |
1160 | { | |
ca20916b RS |
1161 | struct gcpro gcpro1; |
1162 | GCPRO1 (form); | |
ee9ee63c | 1163 | do_autoload (def, sym); |
ca20916b | 1164 | UNGCPRO; |
ee9ee63c JB |
1165 | continue; |
1166 | } | |
1167 | else | |
db9f0278 | 1168 | break; |
db9f0278 | 1169 | } |
03699b14 | 1170 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1171 | break; |
03699b14 | 1172 | else expander = XCDR (def); |
db9f0278 JB |
1173 | } |
1174 | else | |
1175 | { | |
03699b14 | 1176 | expander = XCDR (tem); |
265a9e55 | 1177 | if (NILP (expander)) |
db9f0278 JB |
1178 | break; |
1179 | } | |
03699b14 | 1180 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1181 | } |
1182 | return form; | |
1183 | } | |
1184 | \f | |
1185 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1186 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1187 | TAG is evalled to get the tag to use; it must not be nil. | |
1188 | ||
1189 | Then the BODY is executed. | |
1d632ccf | 1190 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1191 | If no throw happens, `catch' returns the value of the last BODY form. |
1192 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1193 | usage: (catch TAG BODY...) */) |
9dbc9081 | 1194 | (args) |
db9f0278 JB |
1195 | Lisp_Object args; |
1196 | { | |
1197 | register Lisp_Object tag; | |
1198 | struct gcpro gcpro1; | |
1199 | ||
1200 | GCPRO1 (args); | |
1201 | tag = Feval (Fcar (args)); | |
1202 | UNGCPRO; | |
1203 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1204 | } | |
1205 | ||
1206 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1207 | FUNC should return a Lisp_Object. | |
1208 | This is how catches are done from within C code. */ | |
1209 | ||
1210 | Lisp_Object | |
1211 | internal_catch (tag, func, arg) | |
1212 | Lisp_Object tag; | |
1213 | Lisp_Object (*func) (); | |
1214 | Lisp_Object arg; | |
1215 | { | |
1216 | /* This structure is made part of the chain `catchlist'. */ | |
1217 | struct catchtag c; | |
1218 | ||
1219 | /* Fill in the components of c, and put it on the list. */ | |
1220 | c.next = catchlist; | |
1221 | c.tag = tag; | |
1222 | c.val = Qnil; | |
1223 | c.backlist = backtrace_list; | |
1224 | c.handlerlist = handlerlist; | |
1225 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1226 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1227 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1228 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1229 | c.gcpro = gcprolist; |
bcf28080 | 1230 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1231 | catchlist = &c; |
1232 | ||
1233 | /* Call FUNC. */ | |
1234 | if (! _setjmp (c.jmp)) | |
1235 | c.val = (*func) (arg); | |
1236 | ||
1237 | /* Throw works by a longjmp that comes right here. */ | |
1238 | catchlist = c.next; | |
1239 | return c.val; | |
1240 | } | |
1241 | ||
ba410f40 JB |
1242 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1243 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1244 | |
ba410f40 JB |
1245 | This is the guts Fthrow and Fsignal; they differ only in the way |
1246 | they choose the catch tag to throw to. A catch tag for a | |
1247 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1248 | |
ba410f40 JB |
1249 | Before each catch is discarded, unbind all special bindings and |
1250 | execute all unwind-protect clauses made above that catch. Unwind | |
1251 | the handler stack as we go, so that the proper handlers are in | |
1252 | effect for each unwind-protect clause we run. At the end, restore | |
1253 | some static info saved in CATCH, and longjmp to the location | |
1254 | specified in the | |
1255 | ||
1256 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1257 | |
1258 | static void | |
ba410f40 | 1259 | unwind_to_catch (catch, value) |
db9f0278 | 1260 | struct catchtag *catch; |
ba410f40 | 1261 | Lisp_Object value; |
db9f0278 JB |
1262 | { |
1263 | register int last_time; | |
1264 | ||
ba410f40 JB |
1265 | /* Save the value in the tag. */ |
1266 | catch->val = value; | |
1267 | ||
0b31741c | 1268 | /* Restore certain special C variables. */ |
1cdc3155 | 1269 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1270 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1271 | handling_signal = 0; |
69bbd6bd | 1272 | immediate_quit = 0; |
82da7701 | 1273 | |
db9f0278 JB |
1274 | do |
1275 | { | |
1276 | last_time = catchlist == catch; | |
82da7701 JB |
1277 | |
1278 | /* Unwind the specpdl stack, and then restore the proper set of | |
1279 | handlers. */ | |
db9f0278 JB |
1280 | unbind_to (catchlist->pdlcount, Qnil); |
1281 | handlerlist = catchlist->handlerlist; | |
1282 | catchlist = catchlist->next; | |
1283 | } | |
1284 | while (! last_time); | |
1285 | ||
a2a103bb | 1286 | #if HAVE_X_WINDOWS |
88019a63 RS |
1287 | /* If x_catch_errors was done, turn it off now. |
1288 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 KL |
1289 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
1290 | * The catch must remain in effect during that delicate | |
1291 | * state. --lorentey */ | |
88019a63 | 1292 | x_fully_uncatch_errors (); |
e6aee454 | 1293 | #endif |
a2a103bb | 1294 | #endif |
88019a63 | 1295 | |
bcf28080 | 1296 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1297 | gcprolist = catch->gcpro; |
15934ffa RS |
1298 | #ifdef DEBUG_GCPRO |
1299 | if (gcprolist != 0) | |
1300 | gcpro_level = gcprolist->level + 1; | |
1301 | else | |
1302 | gcpro_level = 0; | |
1303 | #endif | |
db9f0278 JB |
1304 | backtrace_list = catch->backlist; |
1305 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1306 | |
ba410f40 | 1307 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1308 | } |
1309 | ||
1310 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
9dbc9081 PJ |
1311 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1312 | Both TAG and VALUE are evalled. */) | |
1313 | (tag, value) | |
79e8bfbf | 1314 | register Lisp_Object tag, value; |
db9f0278 JB |
1315 | { |
1316 | register struct catchtag *c; | |
1317 | ||
8788120f KS |
1318 | if (!NILP (tag)) |
1319 | for (c = catchlist; c; c = c->next) | |
1320 | { | |
1321 | if (EQ (c->tag, tag)) | |
1322 | unwind_to_catch (c, value); | |
1323 | } | |
734d55a2 | 1324 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1325 | } |
1326 | ||
1327 | ||
1328 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1329 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1330 | If BODYFORM completes normally, its value is returned | |
1331 | after executing the UNWINDFORMS. | |
1332 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1333 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
9dbc9081 | 1334 | (args) |
db9f0278 JB |
1335 | Lisp_Object args; |
1336 | { | |
1337 | Lisp_Object val; | |
aed13378 | 1338 | int count = SPECPDL_INDEX (); |
db9f0278 | 1339 | |
04b28167 | 1340 | record_unwind_protect (Fprogn, Fcdr (args)); |
db9f0278 | 1341 | val = Feval (Fcar (args)); |
177c0ea7 | 1342 | return unbind_to (count, val); |
db9f0278 JB |
1343 | } |
1344 | \f | |
1345 | /* Chain of condition handlers currently in effect. | |
1346 | The elements of this chain are contained in the stack frames | |
1347 | of Fcondition_case and internal_condition_case. | |
1348 | When an error is signaled (by calling Fsignal, below), | |
1349 | this chain is searched for an element that applies. */ | |
1350 | ||
1351 | struct handler *handlerlist; | |
1352 | ||
1353 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
9dbc9081 | 1354 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1355 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1356 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1357 | where the BODY is made of Lisp expressions. | |
1358 | ||
1359 | A handler is applicable to an error | |
1360 | if CONDITION-NAME is one of the error's condition names. | |
1361 | If an error happens, the first applicable handler is run. | |
1362 | ||
1363 | The car of a handler may be a list of condition names | |
c997bb25 | 1364 | instead of a single condition name. Then it handles all of them. |
9dbc9081 | 1365 | |
c997bb25 RS |
1366 | When a handler handles an error, control returns to the `condition-case' |
1367 | and it executes the handler's BODY... | |
1368 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA) from the error. | |
1369 | (If VAR is nil, the handler can't access that information.) | |
1370 | Then the value of the last BODY form is returned from the `condition-case' | |
1371 | expression. | |
9dbc9081 | 1372 | |
9dbc9081 | 1373 | See also the function `signal' for more info. |
2b47b74d | 1374 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
9dbc9081 | 1375 | (args) |
db9f0278 JB |
1376 | Lisp_Object args; |
1377 | { | |
17401c97 GM |
1378 | register Lisp_Object bodyform, handlers; |
1379 | volatile Lisp_Object var; | |
db9f0278 | 1380 | |
82da7701 JB |
1381 | var = Fcar (args); |
1382 | bodyform = Fcar (Fcdr (args)); | |
1383 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1384 | |
1385 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1386 | } | |
1387 | ||
1388 | /* Like Fcondition_case, but the args are separate | |
1389 | rather than passed in a list. Used by Fbyte_code. */ | |
1390 | ||
1391 | Lisp_Object | |
1392 | internal_lisp_condition_case (var, bodyform, handlers) | |
1393 | volatile Lisp_Object var; | |
1394 | Lisp_Object bodyform, handlers; | |
1395 | { | |
1396 | Lisp_Object val; | |
1397 | struct catchtag c; | |
1398 | struct handler h; | |
1399 | ||
b7826503 | 1400 | CHECK_SYMBOL (var); |
82da7701 | 1401 | |
2b47b74d | 1402 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1403 | { |
1404 | Lisp_Object tem; | |
2b47b74d | 1405 | tem = XCAR (val); |
5f96776a RS |
1406 | if (! (NILP (tem) |
1407 | || (CONSP (tem) | |
03699b14 KR |
1408 | && (SYMBOLP (XCAR (tem)) |
1409 | || CONSP (XCAR (tem)))))) | |
82da7701 JB |
1410 | error ("Invalid condition handler", tem); |
1411 | } | |
db9f0278 JB |
1412 | |
1413 | c.tag = Qnil; | |
1414 | c.val = Qnil; | |
1415 | c.backlist = backtrace_list; | |
1416 | c.handlerlist = handlerlist; | |
1417 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1418 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1419 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1420 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1421 | c.gcpro = gcprolist; |
bcf28080 | 1422 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1423 | if (_setjmp (c.jmp)) |
1424 | { | |
265a9e55 | 1425 | if (!NILP (h.var)) |
9d58218c RS |
1426 | specbind (h.var, c.val); |
1427 | val = Fprogn (Fcdr (h.chosen_clause)); | |
82da7701 JB |
1428 | |
1429 | /* Note that this just undoes the binding of h.var; whoever | |
1430 | longjumped to us unwound the stack to c.pdlcount before | |
1431 | throwing. */ | |
db9f0278 JB |
1432 | unbind_to (c.pdlcount, Qnil); |
1433 | return val; | |
1434 | } | |
1435 | c.next = catchlist; | |
1436 | catchlist = &c; | |
177c0ea7 | 1437 | |
82da7701 JB |
1438 | h.var = var; |
1439 | h.handler = handlers; | |
db9f0278 | 1440 | h.next = handlerlist; |
db9f0278 JB |
1441 | h.tag = &c; |
1442 | handlerlist = &h; | |
1443 | ||
82da7701 | 1444 | val = Feval (bodyform); |
db9f0278 JB |
1445 | catchlist = c.next; |
1446 | handlerlist = h.next; | |
1447 | return val; | |
1448 | } | |
1449 | ||
f029ca5f RS |
1450 | /* Call the function BFUN with no arguments, catching errors within it |
1451 | according to HANDLERS. If there is an error, call HFUN with | |
1452 | one argument which is the data that describes the error: | |
1453 | (SIGNALNAME . DATA) | |
1454 | ||
1455 | HANDLERS can be a list of conditions to catch. | |
1456 | If HANDLERS is Qt, catch all errors. | |
1457 | If HANDLERS is Qerror, catch all errors | |
1458 | but allow the debugger to run if that is enabled. */ | |
1459 | ||
db9f0278 JB |
1460 | Lisp_Object |
1461 | internal_condition_case (bfun, handlers, hfun) | |
1462 | Lisp_Object (*bfun) (); | |
1463 | Lisp_Object handlers; | |
1464 | Lisp_Object (*hfun) (); | |
1465 | { | |
1466 | Lisp_Object val; | |
1467 | struct catchtag c; | |
1468 | struct handler h; | |
1469 | ||
88019a63 RS |
1470 | /* Since Fsignal will close off all calls to x_catch_errors, |
1471 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1472 | #if HAVE_X_WINDOWS |
88019a63 | 1473 | if (x_catching_errors ()) |
01591d17 | 1474 | abort (); |
a2a103bb | 1475 | #endif |
01591d17 | 1476 | |
db9f0278 JB |
1477 | c.tag = Qnil; |
1478 | c.val = Qnil; | |
1479 | c.backlist = backtrace_list; | |
1480 | c.handlerlist = handlerlist; | |
1481 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1482 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1483 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1484 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1485 | c.gcpro = gcprolist; |
bcf28080 | 1486 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1487 | if (_setjmp (c.jmp)) |
1488 | { | |
9d58218c | 1489 | return (*hfun) (c.val); |
db9f0278 JB |
1490 | } |
1491 | c.next = catchlist; | |
1492 | catchlist = &c; | |
1493 | h.handler = handlers; | |
1494 | h.var = Qnil; | |
db9f0278 JB |
1495 | h.next = handlerlist; |
1496 | h.tag = &c; | |
1497 | handlerlist = &h; | |
1498 | ||
1499 | val = (*bfun) (); | |
1500 | catchlist = c.next; | |
1501 | handlerlist = h.next; | |
1502 | return val; | |
1503 | } | |
1504 | ||
2659a09f | 1505 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1506 | |
d227775c RS |
1507 | Lisp_Object |
1508 | internal_condition_case_1 (bfun, arg, handlers, hfun) | |
1509 | Lisp_Object (*bfun) (); | |
1510 | Lisp_Object arg; | |
1511 | Lisp_Object handlers; | |
1512 | Lisp_Object (*hfun) (); | |
1513 | { | |
1514 | Lisp_Object val; | |
1515 | struct catchtag c; | |
1516 | struct handler h; | |
1517 | ||
88019a63 RS |
1518 | /* Since Fsignal will close off all calls to x_catch_errors, |
1519 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1520 | #if HAVE_X_WINDOWS |
88019a63 RS |
1521 | if (x_catching_errors ()) |
1522 | abort (); | |
a2a103bb | 1523 | #endif |
88019a63 | 1524 | |
d227775c RS |
1525 | c.tag = Qnil; |
1526 | c.val = Qnil; | |
1527 | c.backlist = backtrace_list; | |
1528 | c.handlerlist = handlerlist; | |
1529 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1530 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1531 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1532 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1533 | c.gcpro = gcprolist; |
bcf28080 | 1534 | c.byte_stack = byte_stack_list; |
d227775c RS |
1535 | if (_setjmp (c.jmp)) |
1536 | { | |
9d58218c | 1537 | return (*hfun) (c.val); |
d227775c RS |
1538 | } |
1539 | c.next = catchlist; | |
1540 | catchlist = &c; | |
1541 | h.handler = handlers; | |
1542 | h.var = Qnil; | |
1543 | h.next = handlerlist; | |
1544 | h.tag = &c; | |
1545 | handlerlist = &h; | |
1546 | ||
1547 | val = (*bfun) (arg); | |
1548 | catchlist = c.next; | |
1549 | handlerlist = h.next; | |
1550 | return val; | |
1551 | } | |
10b29d41 GM |
1552 | |
1553 | ||
2659a09f | 1554 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1555 | and ARGS as second argument. */ |
1556 | ||
1557 | Lisp_Object | |
1558 | internal_condition_case_2 (bfun, nargs, args, handlers, hfun) | |
1559 | Lisp_Object (*bfun) (); | |
1560 | int nargs; | |
1561 | Lisp_Object *args; | |
1562 | Lisp_Object handlers; | |
1563 | Lisp_Object (*hfun) (); | |
1564 | { | |
1565 | Lisp_Object val; | |
1566 | struct catchtag c; | |
1567 | struct handler h; | |
1568 | ||
88019a63 RS |
1569 | /* Since Fsignal will close off all calls to x_catch_errors, |
1570 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1571 | #if HAVE_X_WINDOWS |
88019a63 RS |
1572 | if (x_catching_errors ()) |
1573 | abort (); | |
a2a103bb | 1574 | #endif |
88019a63 | 1575 | |
10b29d41 GM |
1576 | c.tag = Qnil; |
1577 | c.val = Qnil; | |
1578 | c.backlist = backtrace_list; | |
1579 | c.handlerlist = handlerlist; | |
1580 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1581 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1582 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1583 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1584 | c.gcpro = gcprolist; |
1585 | c.byte_stack = byte_stack_list; | |
1586 | if (_setjmp (c.jmp)) | |
1587 | { | |
1588 | return (*hfun) (c.val); | |
1589 | } | |
1590 | c.next = catchlist; | |
1591 | catchlist = &c; | |
1592 | h.handler = handlers; | |
1593 | h.var = Qnil; | |
1594 | h.next = handlerlist; | |
1595 | h.tag = &c; | |
1596 | handlerlist = &h; | |
1597 | ||
1598 | val = (*bfun) (nargs, args); | |
1599 | catchlist = c.next; | |
1600 | handlerlist = h.next; | |
1601 | return val; | |
1602 | } | |
1603 | ||
d227775c | 1604 | \f |
2901f1d1 | 1605 | static Lisp_Object find_handler_clause P_ ((Lisp_Object, Lisp_Object, |
f01cbfdd | 1606 | Lisp_Object, Lisp_Object)); |
db9f0278 JB |
1607 | |
1608 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
9dbc9081 PJ |
1609 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1610 | This function does not return. | |
1611 | ||
1612 | An error symbol is a symbol with an `error-conditions' property | |
1613 | that is a list of condition names. | |
1614 | A handler for any of those names will get to handle this signal. | |
1615 | The symbol `error' should normally be one of them. | |
1616 | ||
1617 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1618 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1619 | error message is constructed. | |
9dbc9081 PJ |
1620 | If the signal is handled, DATA is made available to the handler. |
1621 | See also the function `condition-case'. */) | |
1622 | (error_symbol, data) | |
4200e719 | 1623 | Lisp_Object error_symbol, data; |
db9f0278 | 1624 | { |
bfa8ca43 | 1625 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1626 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1627 | That is a special case--don't do this in other situations. */ | |
db9f0278 JB |
1628 | register struct handler *allhandlers = handlerlist; |
1629 | Lisp_Object conditions; | |
1630 | extern int gc_in_progress; | |
1631 | extern int waiting_for_input; | |
c11d3d17 | 1632 | Lisp_Object string; |
1ea9dec4 | 1633 | Lisp_Object real_error_symbol; |
a2ff3819 | 1634 | struct backtrace *bp; |
db9f0278 | 1635 | |
346598f1 | 1636 | immediate_quit = handling_signal = 0; |
d063129f | 1637 | abort_on_gc = 0; |
db9f0278 JB |
1638 | if (gc_in_progress || waiting_for_input) |
1639 | abort (); | |
1640 | ||
1ea9dec4 RS |
1641 | if (NILP (error_symbol)) |
1642 | real_error_symbol = Fcar (data); | |
1643 | else | |
1644 | real_error_symbol = error_symbol; | |
1645 | ||
26631f2b RS |
1646 | #if 0 /* rms: I don't know why this was here, |
1647 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1648 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1649 | if (display_hourglass_p) |
1650 | cancel_hourglass (); | |
48f8dfa3 | 1651 | #endif |
177c0ea7 | 1652 | #endif |
48f8dfa3 | 1653 | |
61ede770 | 1654 | /* This hook is used by edebug. */ |
26631f2b RS |
1655 | if (! NILP (Vsignal_hook_function) |
1656 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1657 | { |
1658 | /* Edebug takes care of restoring these variables when it exits. */ | |
1659 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1660 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1661 | ||
1662 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1663 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1664 | ||
1665 | call2 (Vsignal_hook_function, error_symbol, data); | |
1666 | } | |
61ede770 | 1667 | |
1ea9dec4 | 1668 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1669 | |
a2ff3819 GM |
1670 | /* Remember from where signal was called. Skip over the frame for |
1671 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1672 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1673 | is a memory-full error. */ | |
090a072f | 1674 | Vsignaling_function = Qnil; |
26631f2b | 1675 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1676 | { |
1677 | bp = backtrace_list->next; | |
1678 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1679 | bp = bp->next; | |
1680 | if (bp && bp->function) | |
1681 | Vsignaling_function = *bp->function; | |
1682 | } | |
a2ff3819 | 1683 | |
db9f0278 JB |
1684 | for (; handlerlist; handlerlist = handlerlist->next) |
1685 | { | |
1686 | register Lisp_Object clause; | |
177c0ea7 | 1687 | |
db9f0278 | 1688 | clause = find_handler_clause (handlerlist->handler, conditions, |
f01cbfdd | 1689 | error_symbol, data); |
db9f0278 | 1690 | |
db9f0278 | 1691 | if (EQ (clause, Qlambda)) |
82da7701 | 1692 | { |
690337b7 KH |
1693 | /* We can't return values to code which signaled an error, but we |
1694 | can continue code which has signaled a quit. */ | |
1ea9dec4 | 1695 | if (EQ (real_error_symbol, Qquit)) |
82da7701 JB |
1696 | return Qnil; |
1697 | else | |
d3e6f8be | 1698 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1699 | } |
db9f0278 | 1700 | |
265a9e55 | 1701 | if (!NILP (clause)) |
db9f0278 | 1702 | { |
9d58218c | 1703 | Lisp_Object unwind_data; |
db9f0278 | 1704 | struct handler *h = handlerlist; |
9d58218c | 1705 | |
db9f0278 | 1706 | handlerlist = allhandlers; |
1ea9dec4 RS |
1707 | |
1708 | if (NILP (error_symbol)) | |
1709 | unwind_data = data; | |
9d58218c RS |
1710 | else |
1711 | unwind_data = Fcons (error_symbol, data); | |
1712 | h->chosen_clause = clause; | |
1713 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1714 | } |
1715 | } | |
1716 | ||
1717 | handlerlist = allhandlers; | |
1718 | /* If no handler is present now, try to run the debugger, | |
1719 | and if that fails, throw to top level. */ | |
f01cbfdd | 1720 | find_handler_clause (Qerror, conditions, error_symbol, data); |
c11d3d17 RS |
1721 | if (catchlist != 0) |
1722 | Fthrow (Qtop_level, Qt); | |
1723 | ||
1ea9dec4 | 1724 | if (! NILP (error_symbol)) |
c11d3d17 RS |
1725 | data = Fcons (error_symbol, data); |
1726 | ||
1727 | string = Ferror_message_string (data); | |
d5db4077 | 1728 | fatal ("%s", SDATA (string), 0); |
db9f0278 JB |
1729 | } |
1730 | ||
734d55a2 KS |
1731 | /* Internal version of Fsignal that never returns. |
1732 | Used for anything but Qquit (which can return from Fsignal). */ | |
1733 | ||
1734 | void | |
1735 | xsignal (error_symbol, data) | |
1736 | Lisp_Object error_symbol, data; | |
1737 | { | |
1738 | Fsignal (error_symbol, data); | |
1739 | abort (); | |
1740 | } | |
1741 | ||
1742 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1743 | ||
1744 | void | |
1745 | xsignal0 (error_symbol) | |
1746 | Lisp_Object error_symbol; | |
1747 | { | |
1748 | xsignal (error_symbol, Qnil); | |
1749 | } | |
1750 | ||
1751 | void | |
1752 | xsignal1 (error_symbol, arg) | |
1753 | Lisp_Object error_symbol, arg; | |
1754 | { | |
1755 | xsignal (error_symbol, list1 (arg)); | |
1756 | } | |
1757 | ||
1758 | void | |
1759 | xsignal2 (error_symbol, arg1, arg2) | |
1760 | Lisp_Object error_symbol, arg1, arg2; | |
1761 | { | |
1762 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1763 | } | |
1764 | ||
1765 | void | |
1766 | xsignal3 (error_symbol, arg1, arg2, arg3) | |
1767 | Lisp_Object error_symbol, arg1, arg2, arg3; | |
1768 | { | |
1769 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1770 | } | |
1771 | ||
1772 | /* Signal `error' with message S, and additional arg ARG. | |
1773 | If ARG is not a genuine list, make it a one-element list. */ | |
1774 | ||
1775 | void | |
1776 | signal_error (s, arg) | |
1777 | char *s; | |
1778 | Lisp_Object arg; | |
1779 | { | |
1780 | Lisp_Object tortoise, hare; | |
1781 | ||
1782 | hare = tortoise = arg; | |
1783 | while (CONSP (hare)) | |
1784 | { | |
1785 | hare = XCDR (hare); | |
1786 | if (!CONSP (hare)) | |
1787 | break; | |
1788 | ||
1789 | hare = XCDR (hare); | |
1790 | tortoise = XCDR (tortoise); | |
1791 | ||
1792 | if (EQ (hare, tortoise)) | |
1793 | break; | |
1794 | } | |
1795 | ||
1796 | if (!NILP (hare)) | |
1797 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1798 | ||
1799 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1800 | } | |
1801 | ||
1802 | ||
e0f24100 | 1803 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1804 | a list containing one of CONDITIONS. */ |
1805 | ||
1806 | static int | |
1807 | wants_debugger (list, conditions) | |
1808 | Lisp_Object list, conditions; | |
1809 | { | |
4de86b16 | 1810 | if (NILP (list)) |
128c0f66 RM |
1811 | return 0; |
1812 | if (! CONSP (list)) | |
1813 | return 1; | |
1814 | ||
ab67260b | 1815 | while (CONSP (conditions)) |
128c0f66 | 1816 | { |
ab67260b | 1817 | Lisp_Object this, tail; |
03699b14 KR |
1818 | this = XCAR (conditions); |
1819 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1820 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1821 | return 1; |
03699b14 | 1822 | conditions = XCDR (conditions); |
128c0f66 | 1823 | } |
ab67260b | 1824 | return 0; |
128c0f66 RM |
1825 | } |
1826 | ||
fc950e09 KH |
1827 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1828 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1829 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1830 | |
1831 | static int | |
1832 | skip_debugger (conditions, data) | |
1833 | Lisp_Object conditions, data; | |
1834 | { | |
1835 | Lisp_Object tail; | |
1836 | int first_string = 1; | |
1837 | Lisp_Object error_message; | |
1838 | ||
17401c97 GM |
1839 | error_message = Qnil; |
1840 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1841 | { |
03699b14 | 1842 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1843 | { |
1844 | if (first_string) | |
1845 | { | |
1846 | error_message = Ferror_message_string (data); | |
1847 | first_string = 0; | |
1848 | } | |
177c0ea7 | 1849 | |
03699b14 | 1850 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1851 | return 1; |
1852 | } | |
1853 | else | |
1854 | { | |
1855 | Lisp_Object contail; | |
1856 | ||
17401c97 | 1857 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1858 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1859 | return 1; |
1860 | } | |
1861 | } | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
128c0f66 | 1866 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 1867 | There are two ways to pass SIG and DATA: |
9b942ebd | 1868 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 1869 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 1870 | This is for memory-full errors only. |
1ea9dec4 | 1871 | |
9f5903bb RS |
1872 | We need to increase max_specpdl_size temporarily around |
1873 | anything we do that can push on the specpdl, so as not to get | |
1874 | a second error here in case we're handling specpdl overflow. */ | |
db9f0278 JB |
1875 | |
1876 | static Lisp_Object | |
f01cbfdd | 1877 | find_handler_clause (handlers, conditions, sig, data) |
db9f0278 | 1878 | Lisp_Object handlers, conditions, sig, data; |
db9f0278 JB |
1879 | { |
1880 | register Lisp_Object h; | |
1881 | register Lisp_Object tem; | |
f01cbfdd RS |
1882 | int debugger_called = 0; |
1883 | int debugger_considered = 0; | |
db9f0278 | 1884 | |
f01cbfdd RS |
1885 | /* t is used by handlers for all conditions, set up by C code. */ |
1886 | if (EQ (handlers, Qt)) | |
db9f0278 | 1887 | return Qt; |
f01cbfdd RS |
1888 | |
1889 | /* Don't run the debugger for a memory-full error. | |
1890 | (There is no room in memory to do that!) */ | |
1891 | if (NILP (sig)) | |
1892 | debugger_considered = 1; | |
1893 | ||
61ede770 RS |
1894 | /* error is used similarly, but means print an error message |
1895 | and run the debugger if that is enabled. */ | |
1896 | if (EQ (handlers, Qerror) | |
57a6e758 RS |
1897 | || !NILP (Vdebug_on_signal)) /* This says call debugger even if |
1898 | there is a handler. */ | |
db9f0278 | 1899 | { |
f01cbfdd | 1900 | if (!NILP (sig) && wants_debugger (Vstack_trace_on_error, conditions)) |
88817f3b | 1901 | { |
9f5903bb | 1902 | max_specpdl_size++; |
f01cbfdd | 1903 | #ifdef PROTOTYPES |
88817f3b RS |
1904 | internal_with_output_to_temp_buffer ("*Backtrace*", |
1905 | (Lisp_Object (*) (Lisp_Object)) Fbacktrace, | |
1906 | Qnil); | |
f01cbfdd | 1907 | #else |
88817f3b RS |
1908 | internal_with_output_to_temp_buffer ("*Backtrace*", |
1909 | Fbacktrace, Qnil); | |
f01cbfdd | 1910 | #endif |
9f5903bb | 1911 | max_specpdl_size--; |
88817f3b | 1912 | } |
f01cbfdd RS |
1913 | |
1914 | if (!debugger_considered) | |
db9f0278 | 1915 | { |
f01cbfdd RS |
1916 | debugger_considered = 1; |
1917 | debugger_called = maybe_call_debugger (conditions, sig, data); | |
61ede770 | 1918 | } |
f01cbfdd | 1919 | |
61ede770 RS |
1920 | /* If there is no handler, return saying whether we ran the debugger. */ |
1921 | if (EQ (handlers, Qerror)) | |
1922 | { | |
1923 | if (debugger_called) | |
9f5903bb | 1924 | return Qlambda; |
61ede770 | 1925 | return Qt; |
db9f0278 | 1926 | } |
db9f0278 | 1927 | } |
f01cbfdd | 1928 | |
db9f0278 JB |
1929 | for (h = handlers; CONSP (h); h = Fcdr (h)) |
1930 | { | |
5f96776a RS |
1931 | Lisp_Object handler, condit; |
1932 | ||
1933 | handler = Fcar (h); | |
1934 | if (!CONSP (handler)) | |
db9f0278 | 1935 | continue; |
5f96776a RS |
1936 | condit = Fcar (handler); |
1937 | /* Handle a single condition name in handler HANDLER. */ | |
1938 | if (SYMBOLP (condit)) | |
1939 | { | |
1940 | tem = Fmemq (Fcar (handler), conditions); | |
1941 | if (!NILP (tem)) | |
1942 | return handler; | |
1943 | } | |
1944 | /* Handle a list of condition names in handler HANDLER. */ | |
1945 | else if (CONSP (condit)) | |
1946 | { | |
f01cbfdd RS |
1947 | Lisp_Object tail; |
1948 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1949 | { |
f01cbfdd | 1950 | tem = Fmemq (Fcar (tail), conditions); |
5f96776a | 1951 | if (!NILP (tem)) |
f01cbfdd RS |
1952 | { |
1953 | /* This handler is going to apply. | |
1954 | Does it allow the debugger to run first? */ | |
1955 | if (! debugger_considered && !NILP (Fmemq (Qdebug, condit))) | |
1956 | maybe_call_debugger (conditions, sig, data); | |
1957 | return handler; | |
1958 | } | |
5f96776a RS |
1959 | } |
1960 | } | |
db9f0278 | 1961 | } |
f01cbfdd | 1962 | |
db9f0278 JB |
1963 | return Qnil; |
1964 | } | |
1965 | ||
f01cbfdd RS |
1966 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
1967 | SIG and DATA describe the signal, as in find_handler_clause. */ | |
1968 | ||
1969 | int | |
1970 | maybe_call_debugger (conditions, sig, data) | |
1971 | Lisp_Object conditions, sig, data; | |
1972 | { | |
1973 | Lisp_Object combined_data; | |
1974 | ||
1975 | combined_data = Fcons (sig, data); | |
1976 | ||
1977 | if ( | |
1978 | /* Don't try to run the debugger with interrupts blocked. | |
1979 | The editing loop would return anyway. */ | |
1980 | ! INPUT_BLOCKED_P | |
1981 | /* Does user wants to enter debugger for this kind of error? */ | |
1982 | && (EQ (sig, Qquit) | |
1983 | ? debug_on_quit | |
1984 | : wants_debugger (Vdebug_on_error, conditions)) | |
1985 | && ! skip_debugger (conditions, combined_data) | |
1986 | /* rms: what's this for? */ | |
1987 | && when_entered_debugger < num_nonmacro_input_events) | |
1988 | { | |
1989 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
1990 | return 1; | |
1991 | } | |
1992 | ||
1993 | return 0; | |
1994 | } | |
1995 | ||
db9f0278 JB |
1996 | /* dump an error message; called like printf */ |
1997 | ||
1998 | /* VARARGS 1 */ | |
1999 | void | |
2000 | error (m, a1, a2, a3) | |
2001 | char *m; | |
9125da08 | 2002 | char *a1, *a2, *a3; |
db9f0278 JB |
2003 | { |
2004 | char buf[200]; | |
9125da08 RS |
2005 | int size = 200; |
2006 | int mlen; | |
2007 | char *buffer = buf; | |
2008 | char *args[3]; | |
2009 | int allocated = 0; | |
2010 | Lisp_Object string; | |
2011 | ||
2012 | args[0] = a1; | |
2013 | args[1] = a2; | |
2014 | args[2] = a3; | |
2015 | ||
2016 | mlen = strlen (m); | |
db9f0278 JB |
2017 | |
2018 | while (1) | |
9125da08 | 2019 | { |
955f3ff9 | 2020 | int used = doprnt (buffer, size, m, m + mlen, 3, args); |
9125da08 RS |
2021 | if (used < size) |
2022 | break; | |
2023 | size *= 2; | |
2024 | if (allocated) | |
2025 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
2026 | else |
2027 | { | |
2028 | buffer = (char *) xmalloc (size); | |
2029 | allocated = 1; | |
2030 | } | |
9125da08 RS |
2031 | } |
2032 | ||
955f3ff9 | 2033 | string = build_string (buffer); |
9125da08 | 2034 | if (allocated) |
9ae6734f | 2035 | xfree (buffer); |
9125da08 | 2036 | |
734d55a2 | 2037 | xsignal1 (Qerror, string); |
db9f0278 JB |
2038 | } |
2039 | \f | |
e72706be | 2040 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
2041 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
2042 | This means it contains a description for how to read arguments to give it. | |
2043 | The value is nil for an invalid function or a symbol with no function | |
2044 | definition. | |
2045 | ||
2046 | Interactively callable functions include strings and vectors (treated | |
2047 | as keyboard macros), lambda-expressions that contain a top-level call | |
2048 | to `interactive', autoload definitions made by `autoload' with non-nil | |
2049 | fourth argument, and some of the built-in functions of Lisp. | |
2050 | ||
e72706be RS |
2051 | Also, a symbol satisfies `commandp' if its function definition does so. |
2052 | ||
2053 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2054 | then strings and vectors are not accepted. */) |
e72706be RS |
2055 | (function, for_call_interactively) |
2056 | Lisp_Object function, for_call_interactively; | |
db9f0278 JB |
2057 | { |
2058 | register Lisp_Object fun; | |
2059 | register Lisp_Object funcar; | |
52b71f49 | 2060 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2061 | |
2062 | fun = function; | |
2063 | ||
52b71f49 SM |
2064 | fun = indirect_function (fun); /* Check cycles. */ |
2065 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2066 | return Qnil; |
db9f0278 | 2067 | |
52b71f49 SM |
2068 | /* Check an `interactive-form' property if present, analogous to the |
2069 | function-documentation property. */ | |
2070 | fun = function; | |
2071 | while (SYMBOLP (fun)) | |
2072 | { | |
2073 | Lisp_Object tmp = Fget (fun, intern ("interactive-form")); | |
2074 | if (!NILP (tmp)) | |
2075 | if_prop = Qt; | |
2076 | fun = Fsymbol_function (fun); | |
2077 | } | |
2078 | ||
db9f0278 JB |
2079 | /* Emacs primitives are interactive if their DEFUN specifies an |
2080 | interactive spec. */ | |
90165123 | 2081 | if (SUBRP (fun)) |
04724b69 | 2082 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2083 | |
2084 | /* Bytecode objects are interactive if they are long enough to | |
2085 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2086 | where the interactive spec is stored. */ | |
90165123 | 2087 | else if (COMPILEDP (fun)) |
845975f5 | 2088 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2089 | ? Qt : if_prop); |
db9f0278 JB |
2090 | |
2091 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2092 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2093 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2094 | |
2095 | /* Lists may represent commands. */ | |
2096 | if (!CONSP (fun)) | |
2097 | return Qnil; | |
ed16fb98 | 2098 | funcar = XCAR (fun); |
db9f0278 | 2099 | if (EQ (funcar, Qlambda)) |
52b71f49 | 2100 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
db9f0278 | 2101 | if (EQ (funcar, Qautoload)) |
52b71f49 | 2102 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2103 | else |
2104 | return Qnil; | |
2105 | } | |
2106 | ||
2107 | /* ARGSUSED */ | |
2108 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, | |
9dbc9081 PJ |
2109 | doc: /* Define FUNCTION to autoload from FILE. |
2110 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2111 | Third arg DOCSTRING is documentation for the function. | |
2112 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2113 | Fifth arg TYPE indicates the type of the object: | |
2114 | nil or omitted says FUNCTION is a function, | |
2115 | `keymap' says FUNCTION is really a keymap, and | |
2116 | `macro' or t says FUNCTION is really a macro. | |
2117 | Third through fifth args give info about the real definition. | |
2118 | They default to nil. | |
2119 | If FUNCTION is already defined other than as an autoload, | |
2120 | this does nothing and returns nil. */) | |
2121 | (function, file, docstring, interactive, type) | |
ee9ee63c | 2122 | Lisp_Object function, file, docstring, interactive, type; |
db9f0278 JB |
2123 | { |
2124 | #ifdef NO_ARG_ARRAY | |
2125 | Lisp_Object args[4]; | |
2126 | #endif | |
2127 | ||
b7826503 PJ |
2128 | CHECK_SYMBOL (function); |
2129 | CHECK_STRING (file); | |
db9f0278 JB |
2130 | |
2131 | /* If function is defined and not as an autoload, don't override */ | |
2132 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 2133 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2134 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2135 | return Qnil; |
2136 | ||
7973e637 SM |
2137 | if (NILP (Vpurify_flag)) |
2138 | /* Only add entries after dumping, because the ones before are | |
2139 | not useful and else we get loads of them from the loaddefs.el. */ | |
2140 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
2141 | ||
db9f0278 JB |
2142 | #ifdef NO_ARG_ARRAY |
2143 | args[0] = file; | |
2144 | args[1] = docstring; | |
2145 | args[2] = interactive; | |
ee9ee63c | 2146 | args[3] = type; |
db9f0278 JB |
2147 | |
2148 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); | |
2149 | #else /* NO_ARG_ARRAY */ | |
2150 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); | |
2151 | #endif /* not NO_ARG_ARRAY */ | |
2152 | } | |
2153 | ||
2154 | Lisp_Object | |
2155 | un_autoload (oldqueue) | |
2156 | Lisp_Object oldqueue; | |
2157 | { | |
2158 | register Lisp_Object queue, first, second; | |
2159 | ||
2160 | /* Queue to unwind is current value of Vautoload_queue. | |
2161 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2162 | queue = Vautoload_queue; | |
2163 | Vautoload_queue = oldqueue; | |
2164 | while (CONSP (queue)) | |
2165 | { | |
e509f168 | 2166 | first = XCAR (queue); |
db9f0278 JB |
2167 | second = Fcdr (first); |
2168 | first = Fcar (first); | |
47b82df9 RS |
2169 | if (EQ (first, make_number (0))) |
2170 | Vfeatures = second; | |
db9f0278 JB |
2171 | else |
2172 | Ffset (first, second); | |
e509f168 | 2173 | queue = XCDR (queue); |
db9f0278 JB |
2174 | } |
2175 | return Qnil; | |
2176 | } | |
2177 | ||
ca20916b RS |
2178 | /* Load an autoloaded function. |
2179 | FUNNAME is the symbol which is the function's name. | |
2180 | FUNDEF is the autoload definition (a list). */ | |
2181 | ||
045ba794 | 2182 | void |
db9f0278 JB |
2183 | do_autoload (fundef, funname) |
2184 | Lisp_Object fundef, funname; | |
2185 | { | |
aed13378 | 2186 | int count = SPECPDL_INDEX (); |
d945992e | 2187 | Lisp_Object fun; |
ca20916b | 2188 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2189 | |
aea6173f RS |
2190 | /* This is to make sure that loadup.el gives a clear picture |
2191 | of what files are preloaded and when. */ | |
ab4db096 RS |
2192 | if (! NILP (Vpurify_flag)) |
2193 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2194 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2195 | |
db9f0278 | 2196 | fun = funname; |
b7826503 | 2197 | CHECK_SYMBOL (funname); |
ca20916b | 2198 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2199 | |
f87740dc | 2200 | /* Preserve the match data. */ |
89f2614d | 2201 | record_unwind_save_match_data (); |
177c0ea7 | 2202 | |
a04ee161 RS |
2203 | /* If autoloading gets an error (which includes the error of failing |
2204 | to define the function being called), we use Vautoload_queue | |
2205 | to undo function definitions and `provide' calls made by | |
2206 | the function. We do this in the specific case of autoloading | |
2207 | because autoloading is not an explicit request "load this file", | |
2208 | but rather a request to "call this function". | |
2209 | ||
2210 | The value saved here is to be restored into Vautoload_queue. */ | |
db9f0278 JB |
2211 | record_unwind_protect (un_autoload, Vautoload_queue); |
2212 | Vautoload_queue = Qt; | |
7351b242 | 2213 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2214 | |
db9f0278 JB |
2215 | /* Once loading finishes, don't undo it. */ |
2216 | Vautoload_queue = Qt; | |
2217 | unbind_to (count, Qnil); | |
2218 | ||
a7f96a35 | 2219 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2220 | |
76c2b0cc | 2221 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2222 | error ("Autoloading failed to define function %s", |
d5db4077 | 2223 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2224 | UNGCPRO; |
db9f0278 | 2225 | } |
4c576a83 | 2226 | |
db9f0278 JB |
2227 | \f |
2228 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
9dbc9081 PJ |
2229 | doc: /* Evaluate FORM and return its value. */) |
2230 | (form) | |
db9f0278 JB |
2231 | Lisp_Object form; |
2232 | { | |
2233 | Lisp_Object fun, val, original_fun, original_args; | |
2234 | Lisp_Object funcar; | |
2235 | struct backtrace backtrace; | |
2236 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2237 | ||
df470e3b | 2238 | if (handling_signal) |
48f8dfa3 | 2239 | abort (); |
177c0ea7 | 2240 | |
90165123 | 2241 | if (SYMBOLP (form)) |
2b9bde76 | 2242 | return Fsymbol_value (form); |
db9f0278 JB |
2243 | if (!CONSP (form)) |
2244 | return form; | |
2245 | ||
2246 | QUIT; | |
ee830945 RS |
2247 | if ((consing_since_gc > gc_cons_threshold |
2248 | && consing_since_gc > gc_relative_threshold) | |
2249 | || | |
2250 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2251 | { |
2252 | GCPRO1 (form); | |
2253 | Fgarbage_collect (); | |
2254 | UNGCPRO; | |
2255 | } | |
2256 | ||
2257 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2258 | { | |
2259 | if (max_lisp_eval_depth < 100) | |
2260 | max_lisp_eval_depth = 100; | |
2261 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2262 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2263 | } |
2264 | ||
2265 | original_fun = Fcar (form); | |
2266 | original_args = Fcdr (form); | |
2267 | ||
2268 | backtrace.next = backtrace_list; | |
2269 | backtrace_list = &backtrace; | |
2270 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
2271 | backtrace.args = &original_args; | |
2272 | backtrace.nargs = UNEVALLED; | |
2273 | backtrace.evalargs = 1; | |
2274 | backtrace.debug_on_exit = 0; | |
2275 | ||
2276 | if (debug_on_next_call) | |
2277 | do_debug_on_call (Qt); | |
2278 | ||
2279 | /* At this point, only original_fun and original_args | |
2280 | have values that will be used below */ | |
2281 | retry: | |
8788120f KS |
2282 | |
2283 | /* Optimize for no indirection. */ | |
2284 | fun = original_fun; | |
2285 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2286 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2287 | fun = indirect_function (fun); | |
db9f0278 | 2288 | |
90165123 | 2289 | if (SUBRP (fun)) |
db9f0278 JB |
2290 | { |
2291 | Lisp_Object numargs; | |
166c822d | 2292 | Lisp_Object argvals[8]; |
db9f0278 JB |
2293 | Lisp_Object args_left; |
2294 | register int i, maxargs; | |
2295 | ||
2296 | args_left = original_args; | |
2297 | numargs = Flength (args_left); | |
2298 | ||
c1788fbc RS |
2299 | CHECK_CONS_LIST (); |
2300 | ||
db9f0278 JB |
2301 | if (XINT (numargs) < XSUBR (fun)->min_args || |
2302 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2303 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 JB |
2304 | |
2305 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2306 | { | |
2307 | backtrace.evalargs = 0; | |
2308 | val = (*XSUBR (fun)->function) (args_left); | |
2309 | goto done; | |
2310 | } | |
2311 | ||
2312 | if (XSUBR (fun)->max_args == MANY) | |
2313 | { | |
2314 | /* Pass a vector of evaluated arguments */ | |
2315 | Lisp_Object *vals; | |
2316 | register int argnum = 0; | |
2317 | ||
2318 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
2319 | ||
2320 | GCPRO3 (args_left, fun, fun); | |
2321 | gcpro3.var = vals; | |
2322 | gcpro3.nvars = 0; | |
2323 | ||
265a9e55 | 2324 | while (!NILP (args_left)) |
db9f0278 JB |
2325 | { |
2326 | vals[argnum++] = Feval (Fcar (args_left)); | |
2327 | args_left = Fcdr (args_left); | |
2328 | gcpro3.nvars = argnum; | |
2329 | } | |
db9f0278 JB |
2330 | |
2331 | backtrace.args = vals; | |
2332 | backtrace.nargs = XINT (numargs); | |
2333 | ||
2334 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 2335 | UNGCPRO; |
db9f0278 JB |
2336 | goto done; |
2337 | } | |
2338 | ||
2339 | GCPRO3 (args_left, fun, fun); | |
2340 | gcpro3.var = argvals; | |
2341 | gcpro3.nvars = 0; | |
2342 | ||
2343 | maxargs = XSUBR (fun)->max_args; | |
2344 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2345 | { | |
2346 | argvals[i] = Feval (Fcar (args_left)); | |
2347 | gcpro3.nvars = ++i; | |
2348 | } | |
2349 | ||
2350 | UNGCPRO; | |
2351 | ||
2352 | backtrace.args = argvals; | |
2353 | backtrace.nargs = XINT (numargs); | |
2354 | ||
2355 | switch (i) | |
2356 | { | |
2357 | case 0: | |
2358 | val = (*XSUBR (fun)->function) (); | |
2359 | goto done; | |
2360 | case 1: | |
2361 | val = (*XSUBR (fun)->function) (argvals[0]); | |
2362 | goto done; | |
2363 | case 2: | |
2364 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
2365 | goto done; | |
2366 | case 3: | |
2367 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2368 | argvals[2]); | |
2369 | goto done; | |
2370 | case 4: | |
2371 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2372 | argvals[2], argvals[3]); | |
2373 | goto done; | |
2374 | case 5: | |
2375 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2376 | argvals[3], argvals[4]); | |
2377 | goto done; | |
2378 | case 6: | |
2379 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2380 | argvals[3], argvals[4], argvals[5]); | |
2381 | goto done; | |
15c65264 RS |
2382 | case 7: |
2383 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2384 | argvals[3], argvals[4], argvals[5], | |
2385 | argvals[6]); | |
2386 | goto done; | |
db9f0278 | 2387 | |
166c822d KH |
2388 | case 8: |
2389 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2390 | argvals[3], argvals[4], argvals[5], | |
2391 | argvals[6], argvals[7]); | |
2392 | goto done; | |
2393 | ||
db9f0278 | 2394 | default: |
08564963 JB |
2395 | /* Someone has created a subr that takes more arguments than |
2396 | is supported by this code. We need to either rewrite the | |
2397 | subr to use a different argument protocol, or add more | |
2398 | cases to this switch. */ | |
2399 | abort (); | |
db9f0278 JB |
2400 | } |
2401 | } | |
90165123 | 2402 | if (COMPILEDP (fun)) |
db9f0278 JB |
2403 | val = apply_lambda (fun, original_args, 1); |
2404 | else | |
2405 | { | |
8788120f | 2406 | if (EQ (fun, Qunbound)) |
734d55a2 | 2407 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2408 | if (!CONSP (fun)) |
734d55a2 KS |
2409 | xsignal1 (Qinvalid_function, original_fun); |
2410 | funcar = XCAR (fun); | |
90165123 | 2411 | if (!SYMBOLP (funcar)) |
734d55a2 | 2412 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2413 | if (EQ (funcar, Qautoload)) |
2414 | { | |
2415 | do_autoload (fun, original_fun); | |
2416 | goto retry; | |
2417 | } | |
2418 | if (EQ (funcar, Qmacro)) | |
2419 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
2420 | else if (EQ (funcar, Qlambda)) | |
2421 | val = apply_lambda (fun, original_args, 1); | |
db9f0278 | 2422 | else |
734d55a2 | 2423 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2424 | } |
2425 | done: | |
c1788fbc RS |
2426 | CHECK_CONS_LIST (); |
2427 | ||
db9f0278 JB |
2428 | lisp_eval_depth--; |
2429 | if (backtrace.debug_on_exit) | |
2430 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2431 | backtrace_list = backtrace.next; | |
824eb35e | 2432 | |
db9f0278 JB |
2433 | return val; |
2434 | } | |
2435 | \f | |
2436 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
9dbc9081 PJ |
2437 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2438 | Then return the value FUNCTION returns. | |
2439 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2440 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
2441 | (nargs, args) | |
db9f0278 JB |
2442 | int nargs; |
2443 | Lisp_Object *args; | |
2444 | { | |
2445 | register int i, numargs; | |
2446 | register Lisp_Object spread_arg; | |
2447 | register Lisp_Object *funcall_args; | |
db9f0278 | 2448 | Lisp_Object fun; |
96d44c64 | 2449 | struct gcpro gcpro1; |
db9f0278 JB |
2450 | |
2451 | fun = args [0]; | |
2452 | funcall_args = 0; | |
2453 | spread_arg = args [nargs - 1]; | |
b7826503 | 2454 | CHECK_LIST (spread_arg); |
177c0ea7 | 2455 | |
db9f0278 JB |
2456 | numargs = XINT (Flength (spread_arg)); |
2457 | ||
2458 | if (numargs == 0) | |
2459 | return Ffuncall (nargs - 1, args); | |
2460 | else if (numargs == 1) | |
2461 | { | |
03699b14 | 2462 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2463 | return Ffuncall (nargs, args); |
2464 | } | |
2465 | ||
a6e3fa71 | 2466 | numargs += nargs - 2; |
db9f0278 | 2467 | |
8788120f KS |
2468 | /* Optimize for no indirection. */ |
2469 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2470 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2471 | fun = indirect_function (fun); | |
ffd56f97 | 2472 | if (EQ (fun, Qunbound)) |
db9f0278 | 2473 | { |
ffd56f97 JB |
2474 | /* Let funcall get the error */ |
2475 | fun = args[0]; | |
2476 | goto funcall; | |
db9f0278 JB |
2477 | } |
2478 | ||
90165123 | 2479 | if (SUBRP (fun)) |
db9f0278 JB |
2480 | { |
2481 | if (numargs < XSUBR (fun)->min_args | |
2482 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2483 | goto funcall; /* Let funcall get the error */ | |
2484 | else if (XSUBR (fun)->max_args > numargs) | |
2485 | { | |
2486 | /* Avoid making funcall cons up a yet another new vector of arguments | |
2487 | by explicitly supplying nil's for optional values */ | |
2488 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
2489 | * sizeof (Lisp_Object)); | |
2490 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
2491 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2492 | GCPRO1 (*funcall_args); |
2493 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2494 | } |
2495 | } | |
2496 | funcall: | |
2497 | /* We add 1 to numargs because funcall_args includes the | |
2498 | function itself as well as its arguments. */ | |
2499 | if (!funcall_args) | |
a6e3fa71 JB |
2500 | { |
2501 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
2502 | * sizeof (Lisp_Object)); | |
96d44c64 SM |
2503 | GCPRO1 (*funcall_args); |
2504 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2505 | } |
2506 | ||
db9f0278 JB |
2507 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
2508 | /* Spread the last arg we got. Its first element goes in | |
2509 | the slot that it used to occupy, hence this value of I. */ | |
2510 | i = nargs - 1; | |
265a9e55 | 2511 | while (!NILP (spread_arg)) |
db9f0278 | 2512 | { |
03699b14 KR |
2513 | funcall_args [i++] = XCAR (spread_arg); |
2514 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2515 | } |
a6e3fa71 | 2516 | |
96d44c64 SM |
2517 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
2518 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
2519 | } |
2520 | \f | |
ff936e53 SM |
2521 | /* Run hook variables in various ways. */ |
2522 | ||
2523 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
2901f1d1 SM |
2524 | static Lisp_Object run_hook_with_args P_ ((int, Lisp_Object *, |
2525 | enum run_hooks_condition)); | |
ff936e53 | 2526 | |
8b5176cd | 2527 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2528 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2529 | Each argument should be a symbol, a hook variable. |
2530 | These symbols are processed in the order specified. | |
2531 | If a hook symbol has a non-nil value, that value may be a function | |
2532 | or a list of functions to be called to run the hook. | |
2533 | If the value is a function, it is called with no arguments. | |
2534 | If it is a list, the elements are called, in order, with no arguments. | |
2535 | ||
9f685258 LK |
2536 | Major modes should not use this function directly to run their mode |
2537 | hook; they should use `run-mode-hooks' instead. | |
2538 | ||
72e85d5d RS |
2539 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2540 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2541 | usage: (run-hooks &rest HOOKS) */) |
2542 | (nargs, args) | |
ff936e53 SM |
2543 | int nargs; |
2544 | Lisp_Object *args; | |
2545 | { | |
2546 | Lisp_Object hook[1]; | |
2547 | register int i; | |
2548 | ||
2549 | for (i = 0; i < nargs; i++) | |
2550 | { | |
2551 | hook[0] = args[i]; | |
2552 | run_hook_with_args (1, hook, to_completion); | |
2553 | } | |
2554 | ||
2555 | return Qnil; | |
2556 | } | |
177c0ea7 | 2557 | |
a0d76c27 | 2558 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2559 | Srun_hook_with_args, 1, MANY, 0, |
2560 | doc: /* Run HOOK with the specified arguments ARGS. | |
2561 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2562 | value, that value may be a function or a list of functions to be | |
2563 | called to run the hook. If the value is a function, it is called with | |
2564 | the given arguments and its return value is returned. If it is a list | |
2565 | of functions, those functions are called, in order, | |
2566 | with the given arguments ARGS. | |
d5e2c90c | 2567 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2568 | as that may change. |
2569 | ||
72e85d5d RS |
2570 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2571 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2572 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
2573 | (nargs, args) | |
ff936e53 SM |
2574 | int nargs; |
2575 | Lisp_Object *args; | |
2576 | { | |
2577 | return run_hook_with_args (nargs, args, to_completion); | |
2578 | } | |
2579 | ||
a0d76c27 | 2580 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2581 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2582 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2583 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2584 | value, that value may be a function or a list of functions to be | |
2585 | called to run the hook. If the value is a function, it is called with | |
2586 | the given arguments and its return value is returned. | |
2587 | If it is a list of functions, those functions are called, in order, | |
2588 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2589 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2590 | However, if they all return nil, we return nil. |
9dbc9081 | 2591 | |
72e85d5d RS |
2592 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2593 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2594 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
2595 | (nargs, args) | |
b0b667cb KH |
2596 | int nargs; |
2597 | Lisp_Object *args; | |
2598 | { | |
ff936e53 SM |
2599 | return run_hook_with_args (nargs, args, until_success); |
2600 | } | |
2601 | ||
a0d76c27 | 2602 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2603 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2604 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2605 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2606 | value, that value may be a function or a list of functions to be | |
2607 | called to run the hook. If the value is a function, it is called with | |
2608 | the given arguments and its return value is returned. | |
2609 | If it is a list of functions, those functions are called, in order, | |
2610 | with the given arguments ARGS, until one of them returns nil. | |
2611 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2612 | |
72e85d5d RS |
2613 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2614 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2615 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
2616 | (nargs, args) | |
ff936e53 SM |
2617 | int nargs; |
2618 | Lisp_Object *args; | |
2619 | { | |
2620 | return run_hook_with_args (nargs, args, until_failure); | |
2621 | } | |
2622 | ||
c933ea05 RS |
2623 | /* ARGS[0] should be a hook symbol. |
2624 | Call each of the functions in the hook value, passing each of them | |
2625 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2626 | COND specifies a condition to test after each call | |
2627 | to decide whether to stop. | |
2628 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2629 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2630 | ||
2901f1d1 | 2631 | static Lisp_Object |
ff936e53 SM |
2632 | run_hook_with_args (nargs, args, cond) |
2633 | int nargs; | |
2634 | Lisp_Object *args; | |
2635 | enum run_hooks_condition cond; | |
2636 | { | |
2637 | Lisp_Object sym, val, ret; | |
fada05d6 KH |
2638 | Lisp_Object globals; |
2639 | struct gcpro gcpro1, gcpro2, gcpro3; | |
b0b667cb | 2640 | |
f029ca5f RS |
2641 | /* If we are dying or still initializing, |
2642 | don't do anything--it would probably crash if we tried. */ | |
2643 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2644 | return Qnil; |
f029ca5f | 2645 | |
b0b667cb | 2646 | sym = args[0]; |
aa681b51 | 2647 | val = find_symbol_value (sym); |
ff936e53 SM |
2648 | ret = (cond == until_failure ? Qt : Qnil); |
2649 | ||
b0b667cb | 2650 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2651 | return ret; |
03699b14 | 2652 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2653 | { |
2654 | args[0] = val; | |
2655 | return Ffuncall (nargs, args); | |
2656 | } | |
2657 | else | |
2658 | { | |
fada05d6 KH |
2659 | globals = Qnil; |
2660 | GCPRO3 (sym, val, globals); | |
cb9d21f8 | 2661 | |
ff936e53 SM |
2662 | for (; |
2663 | CONSP (val) && ((cond == to_completion) | |
2664 | || (cond == until_success ? NILP (ret) | |
2665 | : !NILP (ret))); | |
03699b14 | 2666 | val = XCDR (val)) |
b0b667cb | 2667 | { |
03699b14 | 2668 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2669 | { |
2670 | /* t indicates this hook has a local binding; | |
2671 | it means to run the global binding too. */ | |
b0b667cb | 2672 | |
ff936e53 SM |
2673 | for (globals = Fdefault_value (sym); |
2674 | CONSP (globals) && ((cond == to_completion) | |
2675 | || (cond == until_success ? NILP (ret) | |
2676 | : !NILP (ret))); | |
03699b14 | 2677 | globals = XCDR (globals)) |
b0b667cb | 2678 | { |
03699b14 | 2679 | args[0] = XCAR (globals); |
77d92e05 RS |
2680 | /* In a global value, t should not occur. If it does, we |
2681 | must ignore it to avoid an endless loop. */ | |
2682 | if (!EQ (args[0], Qt)) | |
2683 | ret = Ffuncall (nargs, args); | |
b0b667cb KH |
2684 | } |
2685 | } | |
2686 | else | |
2687 | { | |
03699b14 | 2688 | args[0] = XCAR (val); |
ff936e53 | 2689 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2690 | } |
2691 | } | |
cb9d21f8 RS |
2692 | |
2693 | UNGCPRO; | |
ff936e53 | 2694 | return ret; |
b0b667cb KH |
2695 | } |
2696 | } | |
c933ea05 RS |
2697 | |
2698 | /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual | |
2699 | present value of that symbol. | |
2700 | Call each element of FUNLIST, | |
2701 | passing each of them the rest of ARGS. | |
2702 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2703 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2704 | ||
2705 | Lisp_Object | |
2706 | run_hook_list_with_args (funlist, nargs, args) | |
2707 | Lisp_Object funlist; | |
2708 | int nargs; | |
2709 | Lisp_Object *args; | |
2710 | { | |
2711 | Lisp_Object sym; | |
2712 | Lisp_Object val; | |
fada05d6 KH |
2713 | Lisp_Object globals; |
2714 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c933ea05 RS |
2715 | |
2716 | sym = args[0]; | |
fada05d6 KH |
2717 | globals = Qnil; |
2718 | GCPRO3 (sym, val, globals); | |
c933ea05 | 2719 | |
03699b14 | 2720 | for (val = funlist; CONSP (val); val = XCDR (val)) |
c933ea05 | 2721 | { |
03699b14 | 2722 | if (EQ (XCAR (val), Qt)) |
c933ea05 RS |
2723 | { |
2724 | /* t indicates this hook has a local binding; | |
2725 | it means to run the global binding too. */ | |
c933ea05 RS |
2726 | |
2727 | for (globals = Fdefault_value (sym); | |
2728 | CONSP (globals); | |
03699b14 | 2729 | globals = XCDR (globals)) |
c933ea05 | 2730 | { |
03699b14 | 2731 | args[0] = XCAR (globals); |
77d92e05 RS |
2732 | /* In a global value, t should not occur. If it does, we |
2733 | must ignore it to avoid an endless loop. */ | |
2734 | if (!EQ (args[0], Qt)) | |
2735 | Ffuncall (nargs, args); | |
c933ea05 RS |
2736 | } |
2737 | } | |
2738 | else | |
2739 | { | |
03699b14 | 2740 | args[0] = XCAR (val); |
c933ea05 RS |
2741 | Ffuncall (nargs, args); |
2742 | } | |
2743 | } | |
2744 | UNGCPRO; | |
2745 | return Qnil; | |
2746 | } | |
7d48558f RS |
2747 | |
2748 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ | |
2749 | ||
2750 | void | |
2751 | run_hook_with_args_2 (hook, arg1, arg2) | |
2752 | Lisp_Object hook, arg1, arg2; | |
2753 | { | |
2754 | Lisp_Object temp[3]; | |
2755 | temp[0] = hook; | |
2756 | temp[1] = arg1; | |
2757 | temp[2] = arg2; | |
2758 | ||
2759 | Frun_hook_with_args (3, temp); | |
2760 | } | |
ff936e53 | 2761 | \f |
db9f0278 JB |
2762 | /* Apply fn to arg */ |
2763 | Lisp_Object | |
2764 | apply1 (fn, arg) | |
2765 | Lisp_Object fn, arg; | |
2766 | { | |
a6e3fa71 JB |
2767 | struct gcpro gcpro1; |
2768 | ||
2769 | GCPRO1 (fn); | |
265a9e55 | 2770 | if (NILP (arg)) |
a6e3fa71 JB |
2771 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2772 | gcpro1.nvars = 2; | |
db9f0278 JB |
2773 | #ifdef NO_ARG_ARRAY |
2774 | { | |
2775 | Lisp_Object args[2]; | |
2776 | args[0] = fn; | |
2777 | args[1] = arg; | |
a6e3fa71 JB |
2778 | gcpro1.var = args; |
2779 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 JB |
2780 | } |
2781 | #else /* not NO_ARG_ARRAY */ | |
a6e3fa71 | 2782 | RETURN_UNGCPRO (Fapply (2, &fn)); |
db9f0278 JB |
2783 | #endif /* not NO_ARG_ARRAY */ |
2784 | } | |
2785 | ||
2786 | /* Call function fn on no arguments */ | |
2787 | Lisp_Object | |
2788 | call0 (fn) | |
2789 | Lisp_Object fn; | |
2790 | { | |
a6e3fa71 JB |
2791 | struct gcpro gcpro1; |
2792 | ||
2793 | GCPRO1 (fn); | |
2794 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2795 | } |
2796 | ||
15285f9f | 2797 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2798 | /* ARGSUSED */ |
2799 | Lisp_Object | |
15285f9f RS |
2800 | call1 (fn, arg1) |
2801 | Lisp_Object fn, arg1; | |
db9f0278 | 2802 | { |
a6e3fa71 | 2803 | struct gcpro gcpro1; |
db9f0278 | 2804 | #ifdef NO_ARG_ARRAY |
177c0ea7 | 2805 | Lisp_Object args[2]; |
a6e3fa71 | 2806 | |
db9f0278 | 2807 | args[0] = fn; |
15285f9f | 2808 | args[1] = arg1; |
a6e3fa71 JB |
2809 | GCPRO1 (args[0]); |
2810 | gcpro1.nvars = 2; | |
2811 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 | 2812 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2813 | GCPRO1 (fn); |
2814 | gcpro1.nvars = 2; | |
2815 | RETURN_UNGCPRO (Ffuncall (2, &fn)); | |
db9f0278 JB |
2816 | #endif /* not NO_ARG_ARRAY */ |
2817 | } | |
2818 | ||
15285f9f | 2819 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2820 | /* ARGSUSED */ |
2821 | Lisp_Object | |
15285f9f RS |
2822 | call2 (fn, arg1, arg2) |
2823 | Lisp_Object fn, arg1, arg2; | |
db9f0278 | 2824 | { |
a6e3fa71 | 2825 | struct gcpro gcpro1; |
db9f0278 JB |
2826 | #ifdef NO_ARG_ARRAY |
2827 | Lisp_Object args[3]; | |
2828 | args[0] = fn; | |
15285f9f RS |
2829 | args[1] = arg1; |
2830 | args[2] = arg2; | |
a6e3fa71 JB |
2831 | GCPRO1 (args[0]); |
2832 | gcpro1.nvars = 3; | |
2833 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 | 2834 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2835 | GCPRO1 (fn); |
2836 | gcpro1.nvars = 3; | |
2837 | RETURN_UNGCPRO (Ffuncall (3, &fn)); | |
db9f0278 JB |
2838 | #endif /* not NO_ARG_ARRAY */ |
2839 | } | |
2840 | ||
15285f9f | 2841 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2842 | /* ARGSUSED */ |
2843 | Lisp_Object | |
15285f9f RS |
2844 | call3 (fn, arg1, arg2, arg3) |
2845 | Lisp_Object fn, arg1, arg2, arg3; | |
db9f0278 | 2846 | { |
a6e3fa71 | 2847 | struct gcpro gcpro1; |
db9f0278 JB |
2848 | #ifdef NO_ARG_ARRAY |
2849 | Lisp_Object args[4]; | |
2850 | args[0] = fn; | |
15285f9f RS |
2851 | args[1] = arg1; |
2852 | args[2] = arg2; | |
2853 | args[3] = arg3; | |
a6e3fa71 JB |
2854 | GCPRO1 (args[0]); |
2855 | gcpro1.nvars = 4; | |
2856 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 | 2857 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2858 | GCPRO1 (fn); |
2859 | gcpro1.nvars = 4; | |
2860 | RETURN_UNGCPRO (Ffuncall (4, &fn)); | |
db9f0278 JB |
2861 | #endif /* not NO_ARG_ARRAY */ |
2862 | } | |
2863 | ||
15285f9f | 2864 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2865 | /* ARGSUSED */ |
2866 | Lisp_Object | |
15285f9f RS |
2867 | call4 (fn, arg1, arg2, arg3, arg4) |
2868 | Lisp_Object fn, arg1, arg2, arg3, arg4; | |
a5a44b91 JB |
2869 | { |
2870 | struct gcpro gcpro1; | |
2871 | #ifdef NO_ARG_ARRAY | |
2872 | Lisp_Object args[5]; | |
2873 | args[0] = fn; | |
15285f9f RS |
2874 | args[1] = arg1; |
2875 | args[2] = arg2; | |
2876 | args[3] = arg3; | |
2877 | args[4] = arg4; | |
a5a44b91 JB |
2878 | GCPRO1 (args[0]); |
2879 | gcpro1.nvars = 5; | |
2880 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
2881 | #else /* not NO_ARG_ARRAY */ | |
2882 | GCPRO1 (fn); | |
2883 | gcpro1.nvars = 5; | |
2884 | RETURN_UNGCPRO (Ffuncall (5, &fn)); | |
2885 | #endif /* not NO_ARG_ARRAY */ | |
2886 | } | |
2887 | ||
15285f9f RS |
2888 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2889 | /* ARGSUSED */ | |
2890 | Lisp_Object | |
2891 | call5 (fn, arg1, arg2, arg3, arg4, arg5) | |
2892 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5; | |
2893 | { | |
2894 | struct gcpro gcpro1; | |
2895 | #ifdef NO_ARG_ARRAY | |
2896 | Lisp_Object args[6]; | |
2897 | args[0] = fn; | |
2898 | args[1] = arg1; | |
2899 | args[2] = arg2; | |
2900 | args[3] = arg3; | |
2901 | args[4] = arg4; | |
2902 | args[5] = arg5; | |
2903 | GCPRO1 (args[0]); | |
2904 | gcpro1.nvars = 6; | |
2905 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
2906 | #else /* not NO_ARG_ARRAY */ | |
2907 | GCPRO1 (fn); | |
2908 | gcpro1.nvars = 6; | |
2909 | RETURN_UNGCPRO (Ffuncall (6, &fn)); | |
2910 | #endif /* not NO_ARG_ARRAY */ | |
2911 | } | |
2912 | ||
2913 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2914 | /* ARGSUSED */ | |
2915 | Lisp_Object | |
2916 | call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6) | |
2917 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6; | |
2918 | { | |
2919 | struct gcpro gcpro1; | |
2920 | #ifdef NO_ARG_ARRAY | |
2921 | Lisp_Object args[7]; | |
2922 | args[0] = fn; | |
2923 | args[1] = arg1; | |
2924 | args[2] = arg2; | |
2925 | args[3] = arg3; | |
2926 | args[4] = arg4; | |
2927 | args[5] = arg5; | |
2928 | args[6] = arg6; | |
2929 | GCPRO1 (args[0]); | |
2930 | gcpro1.nvars = 7; | |
2931 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
2932 | #else /* not NO_ARG_ARRAY */ | |
2933 | GCPRO1 (fn); | |
2934 | gcpro1.nvars = 7; | |
2935 | RETURN_UNGCPRO (Ffuncall (7, &fn)); | |
2936 | #endif /* not NO_ARG_ARRAY */ | |
2937 | } | |
2938 | ||
6c2ef893 RS |
2939 | /* The caller should GCPRO all the elements of ARGS. */ |
2940 | ||
db9f0278 | 2941 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2942 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2943 | Return the value that function returns. | |
2944 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2945 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
2946 | (nargs, args) | |
db9f0278 JB |
2947 | int nargs; |
2948 | Lisp_Object *args; | |
2949 | { | |
8788120f | 2950 | Lisp_Object fun, original_fun; |
db9f0278 JB |
2951 | Lisp_Object funcar; |
2952 | int numargs = nargs - 1; | |
2953 | Lisp_Object lisp_numargs; | |
2954 | Lisp_Object val; | |
2955 | struct backtrace backtrace; | |
2956 | register Lisp_Object *internal_args; | |
2957 | register int i; | |
2958 | ||
2959 | QUIT; | |
ee830945 RS |
2960 | if ((consing_since_gc > gc_cons_threshold |
2961 | && consing_since_gc > gc_relative_threshold) | |
2962 | || | |
2963 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 2964 | Fgarbage_collect (); |
db9f0278 JB |
2965 | |
2966 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2967 | { | |
2968 | if (max_lisp_eval_depth < 100) | |
2969 | max_lisp_eval_depth = 100; | |
2970 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2971 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2972 | } |
2973 | ||
2974 | backtrace.next = backtrace_list; | |
2975 | backtrace_list = &backtrace; | |
2976 | backtrace.function = &args[0]; | |
2977 | backtrace.args = &args[1]; | |
2978 | backtrace.nargs = nargs - 1; | |
2979 | backtrace.evalargs = 0; | |
2980 | backtrace.debug_on_exit = 0; | |
2981 | ||
2982 | if (debug_on_next_call) | |
2983 | do_debug_on_call (Qlambda); | |
2984 | ||
fff3ff9c KS |
2985 | CHECK_CONS_LIST (); |
2986 | ||
8788120f KS |
2987 | original_fun = args[0]; |
2988 | ||
db9f0278 JB |
2989 | retry: |
2990 | ||
8788120f KS |
2991 | /* Optimize for no indirection. */ |
2992 | fun = original_fun; | |
2993 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2994 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2995 | fun = indirect_function (fun); | |
db9f0278 | 2996 | |
90165123 | 2997 | if (SUBRP (fun)) |
db9f0278 | 2998 | { |
fff3ff9c | 2999 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
3000 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
3001 | { | |
a631e24c | 3002 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 3003 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
3004 | } |
3005 | ||
3006 | if (XSUBR (fun)->max_args == UNEVALLED) | |
734d55a2 | 3007 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3008 | |
3009 | if (XSUBR (fun)->max_args == MANY) | |
3010 | { | |
3011 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
3012 | goto done; | |
3013 | } | |
3014 | ||
3015 | if (XSUBR (fun)->max_args > numargs) | |
3016 | { | |
3017 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
3018 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
3019 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
3020 | internal_args[i] = Qnil; | |
3021 | } | |
3022 | else | |
3023 | internal_args = args + 1; | |
3024 | switch (XSUBR (fun)->max_args) | |
3025 | { | |
3026 | case 0: | |
3027 | val = (*XSUBR (fun)->function) (); | |
3028 | goto done; | |
3029 | case 1: | |
3030 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
3031 | goto done; | |
3032 | case 2: | |
82fc29a1 | 3033 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1]); |
db9f0278 JB |
3034 | goto done; |
3035 | case 3: | |
3036 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3037 | internal_args[2]); | |
3038 | goto done; | |
3039 | case 4: | |
3040 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
82fc29a1 | 3041 | internal_args[2], internal_args[3]); |
db9f0278 JB |
3042 | goto done; |
3043 | case 5: | |
3044 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3045 | internal_args[2], internal_args[3], | |
3046 | internal_args[4]); | |
3047 | goto done; | |
3048 | case 6: | |
3049 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3050 | internal_args[2], internal_args[3], | |
3051 | internal_args[4], internal_args[5]); | |
3052 | goto done; | |
15c65264 RS |
3053 | case 7: |
3054 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3055 | internal_args[2], internal_args[3], | |
3056 | internal_args[4], internal_args[5], | |
3057 | internal_args[6]); | |
3058 | goto done; | |
db9f0278 | 3059 | |
166c822d KH |
3060 | case 8: |
3061 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3062 | internal_args[2], internal_args[3], | |
3063 | internal_args[4], internal_args[5], | |
3064 | internal_args[6], internal_args[7]); | |
3065 | goto done; | |
3066 | ||
db9f0278 | 3067 | default: |
70ee42f7 | 3068 | |
166c822d | 3069 | /* If a subr takes more than 8 arguments without using MANY |
177c0ea7 | 3070 | or UNEVALLED, we need to extend this function to support it. |
70ee42f7 JB |
3071 | Until this is done, there is no way to call the function. */ |
3072 | abort (); | |
db9f0278 JB |
3073 | } |
3074 | } | |
90165123 | 3075 | if (COMPILEDP (fun)) |
db9f0278 JB |
3076 | val = funcall_lambda (fun, numargs, args + 1); |
3077 | else | |
3078 | { | |
8788120f | 3079 | if (EQ (fun, Qunbound)) |
734d55a2 | 3080 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 3081 | if (!CONSP (fun)) |
734d55a2 KS |
3082 | xsignal1 (Qinvalid_function, original_fun); |
3083 | funcar = XCAR (fun); | |
90165123 | 3084 | if (!SYMBOLP (funcar)) |
734d55a2 | 3085 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3086 | if (EQ (funcar, Qlambda)) |
3087 | val = funcall_lambda (fun, numargs, args + 1); | |
db9f0278 JB |
3088 | else if (EQ (funcar, Qautoload)) |
3089 | { | |
8788120f | 3090 | do_autoload (fun, original_fun); |
fff3ff9c | 3091 | CHECK_CONS_LIST (); |
db9f0278 JB |
3092 | goto retry; |
3093 | } | |
3094 | else | |
734d55a2 | 3095 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3096 | } |
3097 | done: | |
c1788fbc | 3098 | CHECK_CONS_LIST (); |
db9f0278 JB |
3099 | lisp_eval_depth--; |
3100 | if (backtrace.debug_on_exit) | |
3101 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
3102 | backtrace_list = backtrace.next; | |
3103 | return val; | |
3104 | } | |
3105 | \f | |
3106 | Lisp_Object | |
3107 | apply_lambda (fun, args, eval_flag) | |
3108 | Lisp_Object fun, args; | |
3109 | int eval_flag; | |
3110 | { | |
3111 | Lisp_Object args_left; | |
3112 | Lisp_Object numargs; | |
3113 | register Lisp_Object *arg_vector; | |
3114 | struct gcpro gcpro1, gcpro2, gcpro3; | |
3115 | register int i; | |
3116 | register Lisp_Object tem; | |
3117 | ||
3118 | numargs = Flength (args); | |
3119 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
3120 | args_left = args; | |
3121 | ||
3122 | GCPRO3 (*arg_vector, args_left, fun); | |
3123 | gcpro1.nvars = 0; | |
3124 | ||
3125 | for (i = 0; i < XINT (numargs);) | |
3126 | { | |
3127 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
3128 | if (eval_flag) tem = Feval (tem); | |
3129 | arg_vector[i++] = tem; | |
3130 | gcpro1.nvars = i; | |
3131 | } | |
3132 | ||
3133 | UNGCPRO; | |
3134 | ||
3135 | if (eval_flag) | |
3136 | { | |
3137 | backtrace_list->args = arg_vector; | |
3138 | backtrace_list->nargs = i; | |
3139 | } | |
3140 | backtrace_list->evalargs = 0; | |
3141 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
3142 | ||
3143 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3144 | if (backtrace_list->debug_on_exit) | |
3145 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3146 | /* Don't do it again when we return to eval. */ | |
3147 | backtrace_list->debug_on_exit = 0; | |
3148 | return tem; | |
3149 | } | |
3150 | ||
3151 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
3152 | and return the result of evaluation. | |
3153 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3154 | ||
2901f1d1 | 3155 | static Lisp_Object |
db9f0278 JB |
3156 | funcall_lambda (fun, nargs, arg_vector) |
3157 | Lisp_Object fun; | |
3158 | int nargs; | |
3159 | register Lisp_Object *arg_vector; | |
3160 | { | |
9ab90667 | 3161 | Lisp_Object val, syms_left, next; |
aed13378 | 3162 | int count = SPECPDL_INDEX (); |
9ab90667 | 3163 | int i, optional, rest; |
db9f0278 | 3164 | |
90165123 | 3165 | if (CONSP (fun)) |
9ab90667 GM |
3166 | { |
3167 | syms_left = XCDR (fun); | |
3168 | if (CONSP (syms_left)) | |
3169 | syms_left = XCAR (syms_left); | |
3170 | else | |
734d55a2 | 3171 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3172 | } |
90165123 | 3173 | else if (COMPILEDP (fun)) |
845975f5 | 3174 | syms_left = AREF (fun, COMPILED_ARGLIST); |
9ab90667 GM |
3175 | else |
3176 | abort (); | |
db9f0278 | 3177 | |
9ab90667 GM |
3178 | i = optional = rest = 0; |
3179 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3180 | { |
3181 | QUIT; | |
177c0ea7 | 3182 | |
9ab90667 | 3183 | next = XCAR (syms_left); |
8788120f | 3184 | if (!SYMBOLP (next)) |
734d55a2 | 3185 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3186 | |
db9f0278 JB |
3187 | if (EQ (next, Qand_rest)) |
3188 | rest = 1; | |
3189 | else if (EQ (next, Qand_optional)) | |
3190 | optional = 1; | |
3191 | else if (rest) | |
3192 | { | |
9ffa21d4 | 3193 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
3194 | i = nargs; |
3195 | } | |
3196 | else if (i < nargs) | |
9ab90667 | 3197 | specbind (next, arg_vector[i++]); |
db9f0278 | 3198 | else if (!optional) |
734d55a2 | 3199 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 JB |
3200 | else |
3201 | specbind (next, Qnil); | |
3202 | } | |
3203 | ||
9ab90667 | 3204 | if (!NILP (syms_left)) |
734d55a2 | 3205 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3206 | else if (i < nargs) |
734d55a2 | 3207 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3208 | |
90165123 | 3209 | if (CONSP (fun)) |
9ab90667 | 3210 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3211 | else |
ca248607 RS |
3212 | { |
3213 | /* If we have not actually read the bytecode string | |
3214 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3215 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3216 | Ffetch_bytecode (fun); |
845975f5 SM |
3217 | val = Fbyte_code (AREF (fun, COMPILED_BYTECODE), |
3218 | AREF (fun, COMPILED_CONSTANTS), | |
3219 | AREF (fun, COMPILED_STACK_DEPTH)); | |
ca248607 | 3220 | } |
177c0ea7 | 3221 | |
db9f0278 JB |
3222 | return unbind_to (count, val); |
3223 | } | |
661c7d6e KH |
3224 | |
3225 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3226 | 1, 1, 0, |
3227 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
3228 | (object) | |
661c7d6e KH |
3229 | Lisp_Object object; |
3230 | { | |
3231 | Lisp_Object tem; | |
3232 | ||
845975f5 | 3233 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3234 | { |
845975f5 | 3235 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3236 | if (!CONSP (tem)) |
845975f5 SM |
3237 | { |
3238 | tem = AREF (object, COMPILED_BYTECODE); | |
3239 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3240 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3241 | else |
3242 | error ("Invalid byte code"); | |
3243 | } | |
3ae565b3 SM |
3244 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3245 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3246 | } |
3247 | return object; | |
3248 | } | |
db9f0278 JB |
3249 | \f |
3250 | void | |
3251 | grow_specpdl () | |
3252 | { | |
aed13378 | 3253 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3254 | if (specpdl_size >= max_specpdl_size) |
3255 | { | |
3256 | if (max_specpdl_size < 400) | |
3257 | max_specpdl_size = 400; | |
3258 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3259 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3260 | } |
3261 | specpdl_size *= 2; | |
3262 | if (specpdl_size > max_specpdl_size) | |
3263 | specpdl_size = max_specpdl_size; | |
3264 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3265 | specpdl_ptr = specpdl + count; | |
3266 | } | |
3267 | ||
3268 | void | |
3269 | specbind (symbol, value) | |
3270 | Lisp_Object symbol, value; | |
3271 | { | |
19cebf5a | 3272 | Lisp_Object valcontents; |
db9f0278 | 3273 | |
b7826503 | 3274 | CHECK_SYMBOL (symbol); |
db9f0278 JB |
3275 | if (specpdl_ptr == specpdl + specpdl_size) |
3276 | grow_specpdl (); | |
719177b3 | 3277 | |
19cebf5a GM |
3278 | /* The most common case is that of a non-constant symbol with a |
3279 | trivial value. Make that as fast as we can. */ | |
3280 | valcontents = SYMBOL_VALUE (symbol); | |
3281 | if (!MISCP (valcontents) && !SYMBOL_CONSTANT_P (symbol)) | |
719177b3 | 3282 | { |
9ab90667 | 3283 | specpdl_ptr->symbol = symbol; |
19cebf5a | 3284 | specpdl_ptr->old_value = valcontents; |
9ab90667 GM |
3285 | specpdl_ptr->func = NULL; |
3286 | ++specpdl_ptr; | |
19cebf5a | 3287 | SET_SYMBOL_VALUE (symbol, value); |
719177b3 RS |
3288 | } |
3289 | else | |
9ab90667 | 3290 | { |
136eb6ed | 3291 | Lisp_Object ovalue = find_symbol_value (symbol); |
9ab90667 GM |
3292 | specpdl_ptr->func = 0; |
3293 | specpdl_ptr->old_value = ovalue; | |
719177b3 | 3294 | |
eb700b82 GM |
3295 | valcontents = XSYMBOL (symbol)->value; |
3296 | ||
3297 | if (BUFFER_LOCAL_VALUEP (valcontents) | |
eb700b82 | 3298 | || BUFFER_OBJFWDP (valcontents)) |
9ab90667 | 3299 | { |
0967b4b0 GM |
3300 | Lisp_Object where, current_buffer; |
3301 | ||
3302 | current_buffer = Fcurrent_buffer (); | |
177c0ea7 | 3303 | |
9ab90667 | 3304 | /* For a local variable, record both the symbol and which |
eb700b82 GM |
3305 | buffer's or frame's value we are saving. */ |
3306 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
0967b4b0 | 3307 | where = current_buffer; |
67ee9f6e | 3308 | else if (BUFFER_LOCAL_VALUEP (valcontents) |
eb700b82 GM |
3309 | && XBUFFER_LOCAL_VALUE (valcontents)->found_for_frame) |
3310 | where = XBUFFER_LOCAL_VALUE (valcontents)->frame; | |
3311 | else | |
3312 | where = Qnil; | |
3313 | ||
3314 | /* We're not using the `unused' slot in the specbinding | |
3315 | structure because this would mean we have to do more | |
3316 | work for simple variables. */ | |
0967b4b0 | 3317 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, current_buffer)); |
06bccf8e GM |
3318 | |
3319 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3320 | buffer-local value here, make the `let' change the global | |
3321 | value by changing the value of SYMBOL in all buffers not | |
3322 | having their own value. This is consistent with what | |
3323 | happens with other buffer-local variables. */ | |
eb700b82 GM |
3324 | if (NILP (where) |
3325 | && BUFFER_OBJFWDP (valcontents)) | |
06bccf8e GM |
3326 | { |
3327 | ++specpdl_ptr; | |
3328 | Fset_default (symbol, value); | |
3329 | return; | |
3330 | } | |
9ab90667 GM |
3331 | } |
3332 | else | |
3333 | specpdl_ptr->symbol = symbol; | |
3334 | ||
3335 | specpdl_ptr++; | |
136eb6ed SM |
3336 | /* We used to do |
3337 | if (BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue)) | |
3338 | store_symval_forwarding (symbol, ovalue, value, NULL); | |
3339 | else | |
3340 | but ovalue comes from find_symbol_value which should never return | |
3341 | such an internal value. */ | |
3342 | eassert (!(BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue))); | |
3343 | set_internal (symbol, value, 0, 1); | |
9ab90667 | 3344 | } |
db9f0278 JB |
3345 | } |
3346 | ||
3347 | void | |
3348 | record_unwind_protect (function, arg) | |
1d159538 | 3349 | Lisp_Object (*function) P_ ((Lisp_Object)); |
db9f0278 JB |
3350 | Lisp_Object arg; |
3351 | { | |
9ba8e10d CY |
3352 | eassert (!handling_signal); |
3353 | ||
db9f0278 JB |
3354 | if (specpdl_ptr == specpdl + specpdl_size) |
3355 | grow_specpdl (); | |
3356 | specpdl_ptr->func = function; | |
3357 | specpdl_ptr->symbol = Qnil; | |
3358 | specpdl_ptr->old_value = arg; | |
3359 | specpdl_ptr++; | |
3360 | } | |
3361 | ||
3362 | Lisp_Object | |
3363 | unbind_to (count, value) | |
3364 | int count; | |
3365 | Lisp_Object value; | |
3366 | { | |
5a073f50 KS |
3367 | Lisp_Object quitf = Vquit_flag; |
3368 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3369 | |
5a073f50 | 3370 | GCPRO2 (value, quitf); |
db9f0278 JB |
3371 | Vquit_flag = Qnil; |
3372 | ||
3373 | while (specpdl_ptr != specpdl + count) | |
3374 | { | |
611a8f8c RS |
3375 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3376 | the work to unbind it. We decrement first | |
3377 | so that an error in unbinding won't try to unbind | |
3378 | the same entry again, and we copy the binding first | |
3379 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3380 | |
45f266dc DL |
3381 | struct specbinding this_binding; |
3382 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3383 | |
3384 | if (this_binding.func != 0) | |
3385 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3386 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3387 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3388 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3389 | bound a variable that had a buffer-local or frame-local |
3390 | binding. WHERE nil means that the variable had the default | |
0967b4b0 GM |
3391 | value when it was bound. CURRENT-BUFFER is the buffer that |
3392 | was current when the variable was bound. */ | |
611a8f8c | 3393 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3394 | { |
eb700b82 | 3395 | Lisp_Object symbol, where; |
719177b3 | 3396 | |
611a8f8c RS |
3397 | symbol = XCAR (this_binding.symbol); |
3398 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3399 | |
eb700b82 | 3400 | if (NILP (where)) |
611a8f8c | 3401 | Fset_default (symbol, this_binding.old_value); |
eb700b82 | 3402 | else if (BUFFERP (where)) |
611a8f8c | 3403 | set_internal (symbol, this_binding.old_value, XBUFFER (where), 1); |
177c0ea7 | 3404 | else |
611a8f8c | 3405 | set_internal (symbol, this_binding.old_value, NULL, 1); |
719177b3 | 3406 | } |
db9f0278 | 3407 | else |
9ab90667 GM |
3408 | { |
3409 | /* If variable has a trivial value (no forwarding), we can | |
3410 | just set it. No need to check for constant symbols here, | |
3411 | since that was already done by specbind. */ | |
611a8f8c RS |
3412 | if (!MISCP (SYMBOL_VALUE (this_binding.symbol))) |
3413 | SET_SYMBOL_VALUE (this_binding.symbol, this_binding.old_value); | |
9ab90667 | 3414 | else |
611a8f8c | 3415 | set_internal (this_binding.symbol, this_binding.old_value, 0, 1); |
9ab90667 | 3416 | } |
db9f0278 | 3417 | } |
177c0ea7 | 3418 | |
5a073f50 KS |
3419 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3420 | Vquit_flag = quitf; | |
db9f0278 JB |
3421 | |
3422 | UNGCPRO; | |
db9f0278 JB |
3423 | return value; |
3424 | } | |
3425 | \f | |
db9f0278 | 3426 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3427 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3428 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
3429 | (level, flag) | |
db9f0278 JB |
3430 | Lisp_Object level, flag; |
3431 | { | |
3432 | register struct backtrace *backlist = backtrace_list; | |
3433 | register int i; | |
3434 | ||
b7826503 | 3435 | CHECK_NUMBER (level); |
db9f0278 JB |
3436 | |
3437 | for (i = 0; backlist && i < XINT (level); i++) | |
3438 | { | |
3439 | backlist = backlist->next; | |
3440 | } | |
3441 | ||
3442 | if (backlist) | |
265a9e55 | 3443 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3444 | |
3445 | return flag; | |
3446 | } | |
3447 | ||
3448 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3449 | doc: /* Print a trace of Lisp function calls currently active. |
3450 | Output stream used is value of `standard-output'. */) | |
3451 | () | |
db9f0278 JB |
3452 | { |
3453 | register struct backtrace *backlist = backtrace_list; | |
3454 | register int i; | |
3455 | Lisp_Object tail; | |
3456 | Lisp_Object tem; | |
3457 | extern Lisp_Object Vprint_level; | |
3458 | struct gcpro gcpro1; | |
3459 | ||
a631e24c | 3460 | XSETFASTINT (Vprint_level, 3); |
db9f0278 JB |
3461 | |
3462 | tail = Qnil; | |
3463 | GCPRO1 (tail); | |
3464 | ||
3465 | while (backlist) | |
3466 | { | |
3467 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
3468 | if (backlist->nargs == UNEVALLED) | |
3469 | { | |
3470 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3471 | write_string ("\n", -1); |
db9f0278 JB |
3472 | } |
3473 | else | |
3474 | { | |
3475 | tem = *backlist->function; | |
3476 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
3477 | write_string ("(", -1); | |
3478 | if (backlist->nargs == MANY) | |
3479 | { | |
3480 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 3481 | !NILP (tail); |
db9f0278 JB |
3482 | tail = Fcdr (tail), i++) |
3483 | { | |
3484 | if (i) write_string (" ", -1); | |
3485 | Fprin1 (Fcar (tail), Qnil); | |
3486 | } | |
3487 | } | |
3488 | else | |
3489 | { | |
3490 | for (i = 0; i < backlist->nargs; i++) | |
3491 | { | |
3492 | if (i) write_string (" ", -1); | |
3493 | Fprin1 (backlist->args[i], Qnil); | |
3494 | } | |
3495 | } | |
b6703b02 | 3496 | write_string (")\n", -1); |
db9f0278 | 3497 | } |
db9f0278 JB |
3498 | backlist = backlist->next; |
3499 | } | |
3500 | ||
3501 | Vprint_level = Qnil; | |
3502 | UNGCPRO; | |
3503 | return Qnil; | |
3504 | } | |
3505 | ||
17401c97 | 3506 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3507 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3508 | If that frame has not evaluated the arguments yet (or is a special form), | |
3509 | the value is (nil FUNCTION ARG-FORMS...). | |
3510 | If that frame has evaluated its arguments and called its function already, | |
3511 | the value is (t FUNCTION ARG-VALUES...). | |
3512 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3513 | FUNCTION is whatever was supplied as car of evaluated list, | |
3514 | or a lambda expression for macro calls. | |
3515 | If NFRAMES is more than the number of frames, the value is nil. */) | |
3516 | (nframes) | |
db9f0278 JB |
3517 | Lisp_Object nframes; |
3518 | { | |
3519 | register struct backtrace *backlist = backtrace_list; | |
3520 | register int i; | |
3521 | Lisp_Object tem; | |
3522 | ||
b7826503 | 3523 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3524 | |
3525 | /* Find the frame requested. */ | |
b6703b02 | 3526 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3527 | backlist = backlist->next; |
3528 | ||
3529 | if (!backlist) | |
3530 | return Qnil; | |
3531 | if (backlist->nargs == UNEVALLED) | |
3532 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
3533 | else | |
3534 | { | |
3535 | if (backlist->nargs == MANY) | |
3536 | tem = *backlist->args; | |
3537 | else | |
3538 | tem = Flist (backlist->nargs, backlist->args); | |
3539 | ||
3540 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3541 | } | |
3542 | } | |
a2ff3819 | 3543 | |
db9f0278 | 3544 | \f |
4ce0541e SM |
3545 | void |
3546 | mark_backtrace () | |
3547 | { | |
3548 | register struct backtrace *backlist; | |
3549 | register int i; | |
3550 | ||
3551 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3552 | { | |
3553 | mark_object (*backlist->function); | |
3554 | ||
3555 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) | |
3556 | i = 0; | |
3557 | else | |
3558 | i = backlist->nargs - 1; | |
3559 | for (; i >= 0; i--) | |
3560 | mark_object (backlist->args[i]); | |
3561 | } | |
3562 | } | |
3563 | ||
dfcf069d | 3564 | void |
db9f0278 JB |
3565 | syms_of_eval () |
3566 | { | |
3567 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
82fc29a1 | 3568 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3569 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3570 | an error is signaled. |
3571 | You can safely use a value considerably larger than the default value, | |
3572 | if that proves inconveniently small. However, if you increase it too far, | |
3573 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 JB |
3574 | |
3575 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
9dbc9081 | 3576 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3577 | |
3578 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3579 | actual stack overflow in C, which would be fatal for Emacs. |
3580 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3581 | if that proves inconveniently small. However, if you increase it too far, |
3582 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 JB |
3583 | |
3584 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
9dbc9081 | 3585 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3586 | If the value is t, that means do an ordinary quit. |
3587 | If the value equals `throw-on-input', that means quit by throwing | |
3588 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3589 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3590 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3591 | Vquit_flag = Qnil; |
3592 | ||
3593 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
9dbc9081 PJ |
3594 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3595 | Note that `quit-flag' will still be set by typing C-g, | |
3596 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3597 | To prevent this happening, set `quit-flag' to nil | |
3598 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3599 | Vinhibit_quit = Qnil; |
3600 | ||
ad236261 JB |
3601 | Qinhibit_quit = intern ("inhibit-quit"); |
3602 | staticpro (&Qinhibit_quit); | |
3603 | ||
db9f0278 JB |
3604 | Qautoload = intern ("autoload"); |
3605 | staticpro (&Qautoload); | |
3606 | ||
3607 | Qdebug_on_error = intern ("debug-on-error"); | |
3608 | staticpro (&Qdebug_on_error); | |
3609 | ||
3610 | Qmacro = intern ("macro"); | |
3611 | staticpro (&Qmacro); | |
3612 | ||
d6edd563 GM |
3613 | Qdeclare = intern ("declare"); |
3614 | staticpro (&Qdeclare); | |
177c0ea7 | 3615 | |
db9f0278 JB |
3616 | /* Note that the process handling also uses Qexit, but we don't want |
3617 | to staticpro it twice, so we just do it here. */ | |
3618 | Qexit = intern ("exit"); | |
3619 | staticpro (&Qexit); | |
3620 | ||
3621 | Qinteractive = intern ("interactive"); | |
3622 | staticpro (&Qinteractive); | |
3623 | ||
3624 | Qcommandp = intern ("commandp"); | |
3625 | staticpro (&Qcommandp); | |
3626 | ||
3627 | Qdefun = intern ("defun"); | |
3628 | staticpro (&Qdefun); | |
3629 | ||
3630 | Qand_rest = intern ("&rest"); | |
3631 | staticpro (&Qand_rest); | |
3632 | ||
3633 | Qand_optional = intern ("&optional"); | |
3634 | staticpro (&Qand_optional); | |
3635 | ||
f01cbfdd RS |
3636 | Qdebug = intern ("debug"); |
3637 | staticpro (&Qdebug); | |
3638 | ||
128c0f66 | 3639 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
704788b3 RS |
3640 | doc: /* *Non-nil means errors display a backtrace buffer. |
3641 | More precisely, this happens for any error that is handled | |
3642 | by the editor command loop. | |
9dbc9081 PJ |
3643 | If the value is a list, an error only means to display a backtrace |
3644 | if one of its condition symbols appears in the list. */); | |
128c0f66 | 3645 | Vstack_trace_on_error = Qnil; |
db9f0278 | 3646 | |
128c0f66 | 3647 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
9dbc9081 PJ |
3648 | doc: /* *Non-nil means enter debugger if an error is signaled. |
3649 | Does not apply to errors handled by `condition-case' or those | |
3650 | matched by `debug-ignored-errors'. | |
3651 | If the value is a list, an error only means to enter the debugger | |
3652 | if one of its condition symbols appears in the list. | |
3653 | When you evaluate an expression interactively, this variable | |
3654 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
3655 | See also variable `debug-on-quit'. */); | |
128c0f66 | 3656 | Vdebug_on_error = Qnil; |
db9f0278 | 3657 | |
fc950e09 | 3658 | DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors, |
9dbc9081 PJ |
3659 | doc: /* *List of errors for which the debugger should not be called. |
3660 | Each element may be a condition-name or a regexp that matches error messages. | |
3661 | If any element applies to a given error, that error skips the debugger | |
3662 | and just returns to top level. | |
3663 | This overrides the variable `debug-on-error'. | |
3664 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3665 | Vdebug_ignored_errors = Qnil; |
3666 | ||
db9f0278 | 3667 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, |
82fc29a1 JB |
3668 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
3669 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
3670 | debug_on_quit = 0; |
3671 | ||
3672 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
9dbc9081 | 3673 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3674 | |
556d7314 | 3675 | DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue, |
9dbc9081 PJ |
3676 | doc: /* Non-nil means debugger may continue execution. |
3677 | This is nil when the debugger is called under circumstances where it | |
3678 | might not be safe to continue. */); | |
dac204bc | 3679 | debugger_may_continue = 1; |
556d7314 | 3680 | |
db9f0278 | 3681 | DEFVAR_LISP ("debugger", &Vdebugger, |
9dbc9081 PJ |
3682 | doc: /* Function to call to invoke debugger. |
3683 | If due to frame exit, args are `exit' and the value being returned; | |
3684 | this function's value will be returned instead of that. | |
3685 | If due to error, args are `error' and a list of the args to `signal'. | |
3686 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3687 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3688 | Vdebugger = Qnil; |
3689 | ||
61ede770 | 3690 | DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function, |
9dbc9081 PJ |
3691 | doc: /* If non-nil, this is a function for `signal' to call. |
3692 | It receives the same arguments that `signal' was given. | |
3693 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3694 | Vsignal_hook_function = Qnil; |
3695 | ||
57a6e758 | 3696 | DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal, |
9dbc9081 PJ |
3697 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
3698 | Note that `debug-on-error', `debug-on-quit' and friends | |
3699 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3700 | Vdebug_on_signal = Qnil; |
61ede770 | 3701 | |
d6edd563 GM |
3702 | DEFVAR_LISP ("macro-declaration-function", &Vmacro_declaration_function, |
3703 | doc: /* Function to process declarations in a macro definition. | |
3704 | The function will be called with two args MACRO and DECL. | |
3705 | MACRO is the name of the macro being defined. | |
3706 | DECL is a list `(declare ...)' containing the declarations. | |
3707 | The value the function returns is not used. */); | |
3708 | Vmacro_declaration_function = Qnil; | |
3709 | ||
6e6e9f08 RS |
3710 | Vrun_hooks = intern ("run-hooks"); |
3711 | staticpro (&Vrun_hooks); | |
db9f0278 JB |
3712 | |
3713 | staticpro (&Vautoload_queue); | |
3714 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3715 | staticpro (&Vsignaling_function); |
3716 | Vsignaling_function = Qnil; | |
db9f0278 JB |
3717 | |
3718 | defsubr (&Sor); | |
3719 | defsubr (&Sand); | |
3720 | defsubr (&Sif); | |
3721 | defsubr (&Scond); | |
3722 | defsubr (&Sprogn); | |
3723 | defsubr (&Sprog1); | |
3724 | defsubr (&Sprog2); | |
3725 | defsubr (&Ssetq); | |
3726 | defsubr (&Squote); | |
3727 | defsubr (&Sfunction); | |
3728 | defsubr (&Sdefun); | |
3729 | defsubr (&Sdefmacro); | |
3730 | defsubr (&Sdefvar); | |
19cebf5a | 3731 | defsubr (&Sdefvaralias); |
db9f0278 JB |
3732 | defsubr (&Sdefconst); |
3733 | defsubr (&Suser_variable_p); | |
3734 | defsubr (&Slet); | |
3735 | defsubr (&SletX); | |
3736 | defsubr (&Swhile); | |
3737 | defsubr (&Smacroexpand); | |
3738 | defsubr (&Scatch); | |
3739 | defsubr (&Sthrow); | |
3740 | defsubr (&Sunwind_protect); | |
3741 | defsubr (&Scondition_case); | |
3742 | defsubr (&Ssignal); | |
3743 | defsubr (&Sinteractive_p); | |
4b664e76 | 3744 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
3745 | defsubr (&Scommandp); |
3746 | defsubr (&Sautoload); | |
3747 | defsubr (&Seval); | |
3748 | defsubr (&Sapply); | |
3749 | defsubr (&Sfuncall); | |
ff936e53 SM |
3750 | defsubr (&Srun_hooks); |
3751 | defsubr (&Srun_hook_with_args); | |
3752 | defsubr (&Srun_hook_with_args_until_success); | |
3753 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 3754 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3755 | defsubr (&Sbacktrace_debug); |
3756 | defsubr (&Sbacktrace); | |
3757 | defsubr (&Sbacktrace_frame); | |
3758 | } | |
ab5796a9 MB |
3759 | |
3760 | /* arch-tag: 014a07aa-33ab-4a8f-a3d2-ee8a4a9ff7fb | |
3761 | (do not change this comment) */ |