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, |
114f9c96 | 3 | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
8cabe764 | 4 | Free Software Foundation, Inc. |
db9f0278 JB |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
9ec0b715 | 8 | GNU Emacs is free software: you can redistribute it and/or modify |
db9f0278 | 9 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
db9f0278 JB |
12 | |
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
db9f0278 JB |
20 | |
21 | ||
18160b98 | 22 | #include <config.h> |
d7306fe6 | 23 | #include <setjmp.h> |
db9f0278 | 24 | #include "lisp.h" |
9ac0d9e0 | 25 | #include "blockinput.h" |
db9f0278 | 26 | #include "commands.h" |
1f98fa48 | 27 | #include "keyboard.h" |
3648c842 | 28 | #include "dispextern.h" |
94b612ad | 29 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 30 | |
b70e1a2b SM |
31 | #if HAVE_X_WINDOWS |
32 | #include "xterm.h" | |
33 | #endif | |
34 | ||
db9f0278 JB |
35 | /* This definition is duplicated in alloc.c and keyboard.c */ |
36 | /* Putting it in lisp.h makes cc bomb out! */ | |
37 | ||
38 | struct backtrace | |
4c576a83 GM |
39 | { |
40 | struct backtrace *next; | |
41 | Lisp_Object *function; | |
42 | Lisp_Object *args; /* Points to vector of args. */ | |
43 | int nargs; /* Length of vector. | |
daa37602 JB |
44 | If nargs is UNEVALLED, args points to slot holding |
45 | list of unevalled args */ | |
4c576a83 GM |
46 | char evalargs; |
47 | /* Nonzero means call value of debugger when done with this operation. */ | |
48 | char debug_on_exit; | |
49 | }; | |
db9f0278 JB |
50 | |
51 | struct backtrace *backtrace_list; | |
52 | ||
db9f0278 JB |
53 | struct catchtag *catchlist; |
54 | ||
15934ffa RS |
55 | #ifdef DEBUG_GCPRO |
56 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
57 | int gcpro_level; | |
58 | #endif | |
59 | ||
6fd797f5 | 60 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; |
ad236261 | 61 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
db9f0278 JB |
62 | Lisp_Object Qand_rest, Qand_optional; |
63 | Lisp_Object Qdebug_on_error; | |
d6edd563 | 64 | Lisp_Object Qdeclare; |
b9598260 SM |
65 | Lisp_Object Qcurry, Qunevalled; |
66 | Lisp_Object Qinternal_interpreter_environment, Qclosure; | |
67 | ||
f01cbfdd | 68 | Lisp_Object Qdebug; |
2b9aa051 | 69 | extern Lisp_Object Qinteractive_form; |
db9f0278 | 70 | |
6e6e9f08 RS |
71 | /* This holds either the symbol `run-hooks' or nil. |
72 | It is nil at an early stage of startup, and when Emacs | |
73 | is shutting down. */ | |
4c576a83 | 74 | |
db9f0278 JB |
75 | Lisp_Object Vrun_hooks; |
76 | ||
77 | /* Non-nil means record all fset's and provide's, to be undone | |
78 | if the file being autoloaded is not fully loaded. | |
79 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 80 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
81 | |
82 | Lisp_Object Vautoload_queue; | |
83 | ||
b9598260 SM |
84 | /* When lexical binding is being used, this is non-nil, and contains an |
85 | alist of lexically-bound variable, or t, indicating an empty | |
86 | environment. The lisp name of this variable is | |
87 | `internal-interpreter-lexical-environment'. */ | |
88 | ||
89 | Lisp_Object Vinternal_interpreter_environment; | |
90 | ||
db9f0278 | 91 | /* Current number of specbindings allocated in specpdl. */ |
4c576a83 | 92 | |
db9f0278 JB |
93 | int specpdl_size; |
94 | ||
95 | /* Pointer to beginning of specpdl. */ | |
4c576a83 | 96 | |
db9f0278 JB |
97 | struct specbinding *specpdl; |
98 | ||
99 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 100 | |
ab837828 | 101 | struct specbinding *specpdl_ptr; |
db9f0278 JB |
102 | |
103 | /* Maximum size allowed for specpdl allocation */ | |
4c576a83 | 104 | |
31ade731 | 105 | EMACS_INT max_specpdl_size; |
db9f0278 JB |
106 | |
107 | /* Depth in Lisp evaluations and function calls. */ | |
4c576a83 | 108 | |
db9f0278 JB |
109 | int lisp_eval_depth; |
110 | ||
111 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
4c576a83 | 112 | |
31ade731 | 113 | EMACS_INT max_lisp_eval_depth; |
db9f0278 JB |
114 | |
115 | /* Nonzero means enter debugger before next function call */ | |
4c576a83 | 116 | |
db9f0278 JB |
117 | int debug_on_next_call; |
118 | ||
1b1acc13 | 119 | /* Non-zero means debugger may continue. This is zero when the |
556d7314 GM |
120 | debugger is called during redisplay, where it might not be safe to |
121 | continue the interrupted redisplay. */ | |
122 | ||
123 | int debugger_may_continue; | |
124 | ||
128c0f66 | 125 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 126 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 127 | |
128c0f66 | 128 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 129 | |
128c0f66 | 130 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 131 | if an error is handled by the command loop's error handler. */ |
4c576a83 | 132 | |
128c0f66 | 133 | Lisp_Object Vdebug_on_error; |
db9f0278 | 134 | |
fc950e09 | 135 | /* List of conditions and regexps specifying error messages which |
1b1acc13 | 136 | do not enter the debugger even if Vdebug_on_error says they should. */ |
4c576a83 | 137 | |
fc950e09 KH |
138 | Lisp_Object Vdebug_ignored_errors; |
139 | ||
61ede770 | 140 | /* Non-nil means call the debugger even if the error will be handled. */ |
4c576a83 | 141 | |
57a6e758 | 142 | Lisp_Object Vdebug_on_signal; |
61ede770 RS |
143 | |
144 | /* Hook for edebug to use. */ | |
4c576a83 | 145 | |
61ede770 RS |
146 | Lisp_Object Vsignal_hook_function; |
147 | ||
db9f0278 | 148 | /* Nonzero means enter debugger if a quit signal |
128c0f66 | 149 | is handled by the command loop's error handler. */ |
4c576a83 | 150 | |
db9f0278 JB |
151 | int debug_on_quit; |
152 | ||
be857679 | 153 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 154 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 155 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
156 | know that the debugger itself has an error, and we should just |
157 | signal the error instead of entering an infinite loop of debugger | |
158 | invocations. */ | |
4c576a83 | 159 | |
82da7701 | 160 | int when_entered_debugger; |
db9f0278 JB |
161 | |
162 | Lisp_Object Vdebugger; | |
163 | ||
a2ff3819 GM |
164 | /* The function from which the last `signal' was called. Set in |
165 | Fsignal. */ | |
166 | ||
167 | Lisp_Object Vsignaling_function; | |
168 | ||
4c576a83 GM |
169 | /* Set to non-zero while processing X events. Checked in Feval to |
170 | make sure the Lisp interpreter isn't called from a signal handler, | |
171 | which is unsafe because the interpreter isn't reentrant. */ | |
172 | ||
173 | int handling_signal; | |
174 | ||
d6edd563 GM |
175 | /* Function to process declarations in defmacro forms. */ |
176 | ||
177 | Lisp_Object Vmacro_declaration_function; | |
178 | ||
873759d5 | 179 | extern Lisp_Object Qrisky_local_variable; |
1283140e RS |
180 | extern Lisp_Object Qfunction; |
181 | ||
b9598260 SM |
182 | static Lisp_Object funcall_lambda P_ ((Lisp_Object, int, Lisp_Object *, |
183 | Lisp_Object)); | |
184 | ||
2381d38d | 185 | static void unwind_to_catch P_ ((struct catchtag *, Lisp_Object)) NO_RETURN; |
eaa1e5ed EZ |
186 | |
187 | #if __GNUC__ | |
188 | /* "gcc -O3" enables automatic function inlining, which optimizes out | |
189 | the arguments for the invocations of these functions, whereas they | |
190 | expect these values on the stack. */ | |
191 | Lisp_Object apply1 () __attribute__((noinline)); | |
192 | Lisp_Object call2 () __attribute__((noinline)); | |
193 | #endif | |
873759d5 | 194 | \f |
dfcf069d | 195 | void |
db9f0278 JB |
196 | init_eval_once () |
197 | { | |
198 | specpdl_size = 50; | |
716acfce | 199 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
270e8074 | 200 | specpdl_ptr = specpdl; |
6588243d | 201 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
a4547405 | 202 | max_specpdl_size = 1000; |
f983eb8a | 203 | max_lisp_eval_depth = 500; |
34d470ba RS |
204 | |
205 | Vrun_hooks = Qnil; | |
db9f0278 JB |
206 | } |
207 | ||
dfcf069d | 208 | void |
db9f0278 JB |
209 | init_eval () |
210 | { | |
211 | specpdl_ptr = specpdl; | |
212 | catchlist = 0; | |
213 | handlerlist = 0; | |
214 | backtrace_list = 0; | |
215 | Vquit_flag = Qnil; | |
216 | debug_on_next_call = 0; | |
217 | lisp_eval_depth = 0; | |
87e21fbd | 218 | #ifdef DEBUG_GCPRO |
15934ffa | 219 | gcpro_level = 0; |
87e21fbd | 220 | #endif |
be857679 | 221 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 222 | when_entered_debugger = -1; |
db9f0278 JB |
223 | } |
224 | ||
9f5903bb RS |
225 | /* unwind-protect function used by call_debugger. */ |
226 | ||
227 | static Lisp_Object | |
228 | restore_stack_limits (data) | |
229 | Lisp_Object data; | |
230 | { | |
231 | max_specpdl_size = XINT (XCAR (data)); | |
232 | max_lisp_eval_depth = XINT (XCDR (data)); | |
538f78c3 | 233 | return Qnil; |
9f5903bb RS |
234 | } |
235 | ||
236 | /* Call the Lisp debugger, giving it argument ARG. */ | |
237 | ||
db9f0278 JB |
238 | Lisp_Object |
239 | call_debugger (arg) | |
240 | Lisp_Object arg; | |
241 | { | |
3648c842 | 242 | int debug_while_redisplaying; |
aed13378 | 243 | int count = SPECPDL_INDEX (); |
3648c842 | 244 | Lisp_Object val; |
9f5903bb | 245 | int old_max = max_specpdl_size; |
177c0ea7 | 246 | |
9f5903bb RS |
247 | /* Temporarily bump up the stack limits, |
248 | so the debugger won't run out of stack. */ | |
177c0ea7 | 249 | |
9f5903bb RS |
250 | max_specpdl_size += 1; |
251 | record_unwind_protect (restore_stack_limits, | |
252 | Fcons (make_number (old_max), | |
253 | make_number (max_lisp_eval_depth))); | |
254 | max_specpdl_size = old_max; | |
255 | ||
256 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
257 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
258 | ||
259 | if (SPECPDL_INDEX () + 100 > max_specpdl_size) | |
260 | max_specpdl_size = SPECPDL_INDEX () + 100; | |
177c0ea7 | 261 | |
d148e14d | 262 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
263 | if (display_hourglass_p) |
264 | cancel_hourglass (); | |
237c23b0 GM |
265 | #endif |
266 | ||
db9f0278 | 267 | debug_on_next_call = 0; |
be857679 | 268 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
269 | |
270 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
271 | displayed if the debugger is invoked during redisplay. */ | |
272 | debug_while_redisplaying = redisplaying_p; | |
273 | redisplaying_p = 0; | |
556d7314 GM |
274 | specbind (intern ("debugger-may-continue"), |
275 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 276 | specbind (Qinhibit_redisplay, Qnil); |
9f5903bb | 277 | specbind (Qdebug_on_error, Qnil); |
9db6f6b4 GM |
278 | |
279 | #if 0 /* Binding this prevents execution of Lisp code during | |
280 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 281 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 282 | #endif |
177c0ea7 | 283 | |
3648c842 GM |
284 | val = apply1 (Vdebugger, arg); |
285 | ||
286 | /* Interrupting redisplay and resuming it later is not safe under | |
287 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 288 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
289 | if (debug_while_redisplaying) |
290 | Ftop_level (); | |
291 | ||
556d7314 | 292 | return unbind_to (count, val); |
db9f0278 JB |
293 | } |
294 | ||
dfcf069d | 295 | void |
db9f0278 JB |
296 | do_debug_on_call (code) |
297 | Lisp_Object code; | |
298 | { | |
299 | debug_on_next_call = 0; | |
300 | backtrace_list->debug_on_exit = 1; | |
301 | call_debugger (Fcons (code, Qnil)); | |
302 | } | |
303 | \f | |
304 | /* NOTE!!! Every function that can call EVAL must protect its args | |
305 | and temporaries from garbage collection while it needs them. | |
306 | The definition of `For' shows what you have to do. */ | |
307 | ||
308 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
309 | doc: /* Eval args until one of them yields non-nil, then return that value. |
310 | The remaining args are not evalled at all. | |
311 | If all args return nil, return nil. | |
533eb34b | 312 | usage: (or CONDITIONS...) */) |
9dbc9081 | 313 | (args) |
db9f0278 JB |
314 | Lisp_Object args; |
315 | { | |
e509f168 | 316 | register Lisp_Object val = Qnil; |
db9f0278 JB |
317 | struct gcpro gcpro1; |
318 | ||
e509f168 | 319 | GCPRO1 (args); |
db9f0278 | 320 | |
e509f168 | 321 | while (CONSP (args)) |
db9f0278 | 322 | { |
e509f168 | 323 | val = Feval (XCAR (args)); |
265a9e55 | 324 | if (!NILP (val)) |
db9f0278 | 325 | break; |
e509f168 | 326 | args = XCDR (args); |
db9f0278 | 327 | } |
db9f0278 JB |
328 | |
329 | UNGCPRO; | |
330 | return val; | |
331 | } | |
332 | ||
333 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 334 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
335 | The remaining args are not evalled at all. |
336 | If no arg yields nil, return the last arg's value. | |
533eb34b | 337 | usage: (and CONDITIONS...) */) |
9dbc9081 | 338 | (args) |
db9f0278 JB |
339 | Lisp_Object args; |
340 | { | |
e509f168 | 341 | register Lisp_Object val = Qt; |
db9f0278 JB |
342 | struct gcpro gcpro1; |
343 | ||
e509f168 | 344 | GCPRO1 (args); |
db9f0278 | 345 | |
e509f168 | 346 | while (CONSP (args)) |
db9f0278 | 347 | { |
e509f168 | 348 | val = Feval (XCAR (args)); |
265a9e55 | 349 | if (NILP (val)) |
db9f0278 | 350 | break; |
e509f168 | 351 | args = XCDR (args); |
db9f0278 | 352 | } |
db9f0278 JB |
353 | |
354 | UNGCPRO; | |
355 | return val; | |
356 | } | |
357 | ||
358 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 359 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
360 | Returns the value of THEN or the value of the last of the ELSE's. |
361 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
362 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 363 | usage: (if COND THEN ELSE...) */) |
9dbc9081 | 364 | (args) |
db9f0278 JB |
365 | Lisp_Object args; |
366 | { | |
367 | register Lisp_Object cond; | |
368 | struct gcpro gcpro1; | |
369 | ||
370 | GCPRO1 (args); | |
371 | cond = Feval (Fcar (args)); | |
372 | UNGCPRO; | |
373 | ||
265a9e55 | 374 | if (!NILP (cond)) |
db9f0278 JB |
375 | return Feval (Fcar (Fcdr (args))); |
376 | return Fprogn (Fcdr (Fcdr (args))); | |
377 | } | |
378 | ||
379 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
380 | doc: /* Try each clause until one succeeds. |
381 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
382 | and, if the value is non-nil, this clause succeeds: | |
383 | then the expressions in BODY are evaluated and the last one's | |
384 | value is the value of the cond-form. | |
385 | If no clause succeeds, cond returns nil. | |
386 | If a clause has one element, as in (CONDITION), | |
387 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 388 | usage: (cond CLAUSES...) */) |
9dbc9081 | 389 | (args) |
db9f0278 JB |
390 | Lisp_Object args; |
391 | { | |
392 | register Lisp_Object clause, val; | |
393 | struct gcpro gcpro1; | |
394 | ||
395 | val = Qnil; | |
396 | GCPRO1 (args); | |
265a9e55 | 397 | while (!NILP (args)) |
db9f0278 JB |
398 | { |
399 | clause = Fcar (args); | |
400 | val = Feval (Fcar (clause)); | |
265a9e55 | 401 | if (!NILP (val)) |
db9f0278 | 402 | { |
03699b14 KR |
403 | if (!EQ (XCDR (clause), Qnil)) |
404 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
405 | break; |
406 | } | |
03699b14 | 407 | args = XCDR (args); |
db9f0278 JB |
408 | } |
409 | UNGCPRO; | |
410 | ||
411 | return val; | |
412 | } | |
413 | ||
414 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
9dbc9081 | 415 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 416 | usage: (progn BODY...) */) |
9dbc9081 | 417 | (args) |
db9f0278 JB |
418 | Lisp_Object args; |
419 | { | |
e509f168 | 420 | register Lisp_Object val = Qnil; |
db9f0278 JB |
421 | struct gcpro gcpro1; |
422 | ||
e509f168 | 423 | GCPRO1 (args); |
db9f0278 | 424 | |
e509f168 | 425 | while (CONSP (args)) |
db9f0278 | 426 | { |
e509f168 SM |
427 | val = Feval (XCAR (args)); |
428 | args = XCDR (args); | |
db9f0278 | 429 | } |
db9f0278 JB |
430 | |
431 | UNGCPRO; | |
432 | return val; | |
433 | } | |
434 | ||
435 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
bdee2ef3 | 436 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
437 | The value of FIRST is saved during the evaluation of the remaining args, |
438 | whose values are discarded. | |
7a25dc6d | 439 | usage: (prog1 FIRST BODY...) */) |
9dbc9081 | 440 | (args) |
db9f0278 JB |
441 | Lisp_Object args; |
442 | { | |
443 | Lisp_Object val; | |
444 | register Lisp_Object args_left; | |
445 | struct gcpro gcpro1, gcpro2; | |
446 | register int argnum = 0; | |
447 | ||
9ac66b45 | 448 | if (NILP (args)) |
db9f0278 JB |
449 | return Qnil; |
450 | ||
451 | args_left = args; | |
452 | val = Qnil; | |
453 | GCPRO2 (args, val); | |
454 | ||
455 | do | |
456 | { | |
457 | if (!(argnum++)) | |
458 | val = Feval (Fcar (args_left)); | |
459 | else | |
460 | Feval (Fcar (args_left)); | |
461 | args_left = Fcdr (args_left); | |
462 | } | |
265a9e55 | 463 | while (!NILP(args_left)); |
db9f0278 JB |
464 | |
465 | UNGCPRO; | |
466 | return val; | |
467 | } | |
468 | ||
469 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 470 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
471 | The value of FORM2 is saved during the evaluation of the |
472 | remaining args, whose values are discarded. | |
473 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
9dbc9081 | 474 | (args) |
db9f0278 JB |
475 | Lisp_Object args; |
476 | { | |
477 | Lisp_Object val; | |
478 | register Lisp_Object args_left; | |
479 | struct gcpro gcpro1, gcpro2; | |
480 | register int argnum = -1; | |
481 | ||
482 | val = Qnil; | |
483 | ||
87d238ba | 484 | if (NILP (args)) |
db9f0278 JB |
485 | return Qnil; |
486 | ||
487 | args_left = args; | |
488 | val = Qnil; | |
489 | GCPRO2 (args, val); | |
490 | ||
491 | do | |
492 | { | |
493 | if (!(argnum++)) | |
494 | val = Feval (Fcar (args_left)); | |
495 | else | |
496 | Feval (Fcar (args_left)); | |
497 | args_left = Fcdr (args_left); | |
498 | } | |
87d238ba | 499 | while (!NILP (args_left)); |
db9f0278 JB |
500 | |
501 | UNGCPRO; | |
502 | return val; | |
503 | } | |
504 | ||
505 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
506 | doc: /* Set each SYM to the value of its VAL. |
507 | The symbols SYM are variables; they are literal (not evaluated). | |
508 | The values VAL are expressions; they are evaluated. | |
509 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
510 | The second VAL is not computed until after the first SYM is set, and so on; | |
511 | each VAL can use the new value of variables set earlier in the `setq'. | |
512 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 513 | usage: (setq [SYM VAL]...) */) |
9dbc9081 | 514 | (args) |
db9f0278 JB |
515 | Lisp_Object args; |
516 | { | |
517 | register Lisp_Object args_left; | |
b9598260 | 518 | register Lisp_Object val, sym, lex_binding; |
db9f0278 JB |
519 | struct gcpro gcpro1; |
520 | ||
1283140e | 521 | if (NILP (args)) |
db9f0278 JB |
522 | return Qnil; |
523 | ||
524 | args_left = args; | |
525 | GCPRO1 (args); | |
526 | ||
527 | do | |
528 | { | |
529 | val = Feval (Fcar (Fcdr (args_left))); | |
530 | sym = Fcar (args_left); | |
b9598260 SM |
531 | |
532 | if (!NILP (Vinternal_interpreter_environment) | |
533 | && SYMBOLP (sym) | |
534 | && !XSYMBOL (sym)->declared_special | |
535 | && !NILP (lex_binding = Fassq (sym, Vinternal_interpreter_environment))) | |
536 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ | |
537 | else | |
538 | Fset (sym, val); /* SYM is dynamically bound. */ | |
539 | ||
db9f0278 JB |
540 | args_left = Fcdr (Fcdr (args_left)); |
541 | } | |
265a9e55 | 542 | while (!NILP(args_left)); |
db9f0278 JB |
543 | |
544 | UNGCPRO; | |
545 | return val; | |
546 | } | |
177c0ea7 | 547 | |
db9f0278 | 548 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 PJ |
549 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
550 | usage: (quote ARG) */) | |
551 | (args) | |
db9f0278 JB |
552 | Lisp_Object args; |
553 | { | |
1283140e RS |
554 | if (!NILP (Fcdr (args))) |
555 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
556 | return Fcar (args); |
557 | } | |
177c0ea7 | 558 | |
db9f0278 | 559 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
560 | doc: /* Like `quote', but preferred for objects which are functions. |
561 | In byte compilation, `function' causes its argument to be compiled. | |
562 | `quote' cannot do that. | |
563 | usage: (function ARG) */) | |
564 | (args) | |
db9f0278 JB |
565 | Lisp_Object args; |
566 | { | |
b9598260 SM |
567 | Lisp_Object quoted = XCAR (args); |
568 | ||
1283140e RS |
569 | if (!NILP (Fcdr (args))) |
570 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
b9598260 SM |
571 | |
572 | if (!NILP (Vinternal_interpreter_environment) | |
573 | && CONSP (quoted) | |
574 | && EQ (XCAR (quoted), Qlambda)) | |
575 | /* This is a lambda expression within a lexical environment; | |
576 | return an interpreted closure instead of a simple lambda. */ | |
577 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, quoted)); | |
578 | else | |
579 | /* Simply quote the argument. */ | |
580 | return quoted; | |
db9f0278 JB |
581 | } |
582 | ||
e0f331ab | 583 | |
db9f0278 | 584 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, |
84b17ab0 | 585 | doc: /* Return t if the containing function was run directly by user input. |
82fc29a1 JB |
586 | This means that the function was called with `call-interactively' |
587 | \(which includes being called as the binding of a key) | |
84b17ab0 | 588 | and input is currently coming from the keyboard (not a keyboard macro), |
c63df42b RS |
589 | and Emacs is not running in batch mode (`noninteractive' is nil). |
590 | ||
591 | The only known proper use of `interactive-p' is in deciding whether to | |
592 | display a helpful message, or how to display it. If you're thinking | |
593 | of using it for any other purpose, it is quite likely that you're | |
594 | making a mistake. Think: what do you want to do when the command is | |
595 | called from a keyboard macro? | |
596 | ||
84b17ab0 CY |
597 | To test whether your function was called with `call-interactively', |
598 | either (i) add an extra optional argument and give it an `interactive' | |
599 | spec that specifies non-nil unconditionally (such as \"p\"); or (ii) | |
600 | use `called-interactively-p'. */) | |
9dbc9081 | 601 | () |
db9f0278 | 602 | { |
b9598260 | 603 | return interactive_p (1) ? Qt : Qnil; |
e0f331ab GM |
604 | } |
605 | ||
606 | ||
9d28c33e | 607 | DEFUN ("called-interactively-p", Fcalled_interactively_p, Scalled_interactively_p, 0, 1, 0, |
84b17ab0 | 608 | doc: /* Return t if the containing function was called by `call-interactively'. |
9d28c33e SM |
609 | If KIND is `interactive', then only return t if the call was made |
610 | interactively by the user, i.e. not in `noninteractive' mode nor | |
611 | when `executing-kbd-macro'. | |
612 | If KIND is `any', on the other hand, it will return t for any kind of | |
613 | interactive call, including being called as the binding of a key, or | |
614 | from a keyboard macro, or in `noninteractive' mode. | |
615 | ||
616 | The only known proper use of `interactive' for KIND is in deciding | |
617 | whether to display a helpful message, or how to display it. If you're | |
618 | thinking of using it for any other purpose, it is quite likely that | |
619 | you're making a mistake. Think: what do you want to do when the | |
620 | command is called from a keyboard macro? | |
84b17ab0 CY |
621 | |
622 | This function is meant for implementing advice and other | |
623 | function-modifying features. Instead of using this, it is sometimes | |
624 | cleaner to give your function an extra optional argument whose | |
625 | `interactive' spec specifies non-nil unconditionally (\"p\" is a good | |
9d28c33e SM |
626 | way to do this), or via (not (or executing-kbd-macro noninteractive)). */) |
627 | (kind) | |
628 | Lisp_Object kind; | |
c63df42b | 629 | { |
9d28c33e SM |
630 | return ((INTERACTIVE || !EQ (kind, intern ("interactive"))) |
631 | && interactive_p (1)) ? Qt : Qnil; | |
c63df42b RS |
632 | } |
633 | ||
634 | ||
635 | /* Return 1 if function in which this appears was called using | |
636 | call-interactively. | |
e0f331ab GM |
637 | |
638 | EXCLUDE_SUBRS_P non-zero means always return 0 if the function | |
639 | called is a built-in. */ | |
640 | ||
641 | int | |
642 | interactive_p (exclude_subrs_p) | |
643 | int exclude_subrs_p; | |
644 | { | |
645 | struct backtrace *btp; | |
646 | Lisp_Object fun; | |
db9f0278 | 647 | |
db9f0278 | 648 | btp = backtrace_list; |
daa37602 JB |
649 | |
650 | /* If this isn't a byte-compiled function, there may be a frame at | |
e0f331ab | 651 | the top for Finteractive_p. If so, skip it. */ |
a7f96a35 | 652 | fun = Findirect_function (*btp->function, Qnil); |
0b31741c RS |
653 | if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p |
654 | || XSUBR (fun) == &Scalled_interactively_p)) | |
db9f0278 | 655 | btp = btp->next; |
daa37602 JB |
656 | |
657 | /* If we're running an Emacs 18-style byte-compiled function, there | |
4402a9ed RS |
658 | may be a frame for Fbytecode at the top level. In any version of |
659 | Emacs there can be Fbytecode frames for subexpressions evaluated | |
660 | inside catch and condition-case. Skip past them. | |
daa37602 | 661 | |
4402a9ed | 662 | If this isn't a byte-compiled function, then we may now be |
daa37602 | 663 | looking at several frames for special forms. Skip past them. */ |
4402a9ed RS |
664 | while (btp |
665 | && (EQ (*btp->function, Qbytecode) | |
666 | || btp->nargs == UNEVALLED)) | |
a6e3fa71 JB |
667 | btp = btp->next; |
668 | ||
daa37602 JB |
669 | /* btp now points at the frame of the innermost function that isn't |
670 | a special form, ignoring frames for Finteractive_p and/or | |
671 | Fbytecode at the top. If this frame is for a built-in function | |
672 | (such as load or eval-region) return nil. */ | |
a7f96a35 | 673 | fun = Findirect_function (*btp->function, Qnil); |
e0f331ab GM |
674 | if (exclude_subrs_p && SUBRP (fun)) |
675 | return 0; | |
177c0ea7 | 676 | |
db9f0278 JB |
677 | /* btp points to the frame of a Lisp function that called interactive-p. |
678 | Return t if that function was called interactively. */ | |
679 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
e0f331ab GM |
680 | return 1; |
681 | return 0; | |
db9f0278 JB |
682 | } |
683 | ||
e0f331ab | 684 | |
db9f0278 | 685 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, |
9dbc9081 PJ |
686 | doc: /* Define NAME as a function. |
687 | The definition is (lambda ARGLIST [DOCSTRING] BODY...). | |
688 | See also the function `interactive'. | |
7a25dc6d | 689 | usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */) |
9dbc9081 | 690 | (args) |
db9f0278 JB |
691 | Lisp_Object args; |
692 | { | |
693 | register Lisp_Object fn_name; | |
694 | register Lisp_Object defn; | |
695 | ||
696 | fn_name = Fcar (args); | |
6992a868 | 697 | CHECK_SYMBOL (fn_name); |
db9f0278 | 698 | defn = Fcons (Qlambda, Fcdr (args)); |
b9598260 SM |
699 | if (! NILP (Vinternal_interpreter_environment)) |
700 | defn = Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, defn)); | |
265a9e55 | 701 | if (!NILP (Vpurify_flag)) |
db9f0278 | 702 | defn = Fpurecopy (defn); |
f58e9f8c RS |
703 | if (CONSP (XSYMBOL (fn_name)->function) |
704 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
705 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 706 | Ffset (fn_name, defn); |
6fd797f5 | 707 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
708 | return fn_name; |
709 | } | |
710 | ||
711 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
9dbc9081 | 712 | doc: /* Define NAME as a macro. |
0654d6e3 RS |
713 | The actual definition looks like |
714 | (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...). | |
9dbc9081 PJ |
715 | When the macro is called, as in (NAME ARGS...), |
716 | the function (lambda ARGLIST BODY...) is applied to | |
717 | the list ARGS... as it appears in the expression, | |
718 | and the result should be a form to be evaluated instead of the original. | |
0654d6e3 RS |
719 | |
720 | DECL is a declaration, optional, which can specify how to indent | |
4ba50634 JPW |
721 | calls to this macro, how Edebug should handle it, and which argument |
722 | should be treated as documentation. It looks like this: | |
0654d6e3 RS |
723 | (declare SPECS...) |
724 | The elements can look like this: | |
725 | (indent INDENT) | |
726 | Set NAME's `lisp-indent-function' property to INDENT. | |
727 | ||
e509f168 | 728 | (debug DEBUG) |
0654d6e3 | 729 | Set NAME's `edebug-form-spec' property to DEBUG. (This is |
7d5c86e5 | 730 | equivalent to writing a `def-edebug-spec' for the macro.) |
4ba50634 JPW |
731 | |
732 | (doc-string ELT) | |
733 | Set NAME's `doc-string-elt' property to ELT. | |
734 | ||
0654d6e3 | 735 | usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */) |
9dbc9081 | 736 | (args) |
db9f0278 JB |
737 | Lisp_Object args; |
738 | { | |
739 | register Lisp_Object fn_name; | |
740 | register Lisp_Object defn; | |
d6edd563 | 741 | Lisp_Object lambda_list, doc, tail; |
db9f0278 JB |
742 | |
743 | fn_name = Fcar (args); | |
8e975df9 | 744 | CHECK_SYMBOL (fn_name); |
d6edd563 GM |
745 | lambda_list = Fcar (Fcdr (args)); |
746 | tail = Fcdr (Fcdr (args)); | |
747 | ||
748 | doc = Qnil; | |
749 | if (STRINGP (Fcar (tail))) | |
750 | { | |
e509f168 SM |
751 | doc = XCAR (tail); |
752 | tail = XCDR (tail); | |
d6edd563 GM |
753 | } |
754 | ||
755 | while (CONSP (Fcar (tail)) | |
756 | && EQ (Fcar (Fcar (tail)), Qdeclare)) | |
757 | { | |
758 | if (!NILP (Vmacro_declaration_function)) | |
759 | { | |
760 | struct gcpro gcpro1; | |
761 | GCPRO1 (args); | |
762 | call2 (Vmacro_declaration_function, fn_name, Fcar (tail)); | |
763 | UNGCPRO; | |
764 | } | |
177c0ea7 | 765 | |
d6edd563 GM |
766 | tail = Fcdr (tail); |
767 | } | |
768 | ||
769 | if (NILP (doc)) | |
770 | tail = Fcons (lambda_list, tail); | |
771 | else | |
772 | tail = Fcons (lambda_list, Fcons (doc, tail)); | |
b9598260 SM |
773 | |
774 | defn = Fcons (Qlambda, tail); | |
775 | if (! NILP (Vinternal_interpreter_environment)) | |
776 | defn = Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, defn)); | |
777 | defn = Fcons (Qmacro, defn); | |
177c0ea7 | 778 | |
265a9e55 | 779 | if (!NILP (Vpurify_flag)) |
db9f0278 | 780 | defn = Fpurecopy (defn); |
f58e9f8c RS |
781 | if (CONSP (XSYMBOL (fn_name)->function) |
782 | && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload)) | |
783 | LOADHIST_ATTACH (Fcons (Qt, fn_name)); | |
db9f0278 | 784 | Ffset (fn_name, defn); |
6fd797f5 | 785 | LOADHIST_ATTACH (Fcons (Qdefun, fn_name)); |
db9f0278 JB |
786 | return fn_name; |
787 | } | |
788 | ||
19cebf5a | 789 | |
1848d15d | 790 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 791 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 792 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 793 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
794 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
795 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
796 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
797 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 JB |
798 | The return value is BASE-VARIABLE. */) |
799 | (new_alias, base_variable, docstring) | |
800 | Lisp_Object new_alias, base_variable, docstring; | |
19cebf5a GM |
801 | { |
802 | struct Lisp_Symbol *sym; | |
1848d15d | 803 | |
4a9308b8 JB |
804 | CHECK_SYMBOL (new_alias); |
805 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 806 | |
4a9308b8 | 807 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
808 | |
809 | if (sym->constant) | |
178f2507 SM |
810 | /* Not sure why, but why not? */ |
811 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
812 | |
813 | switch (sym->redirect) | |
814 | { | |
815 | case SYMBOL_FORWARDED: | |
816 | error ("Cannot make an internal variable an alias"); | |
817 | case SYMBOL_LOCALIZED: | |
818 | error ("Don't know how to make a localized variable an alias"); | |
819 | } | |
820 | ||
dd60787c | 821 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
822 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
823 | so that old-code that affects n_a before the aliasing is setup | |
824 | still works. */ | |
825 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 826 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
827 | |
828 | { | |
829 | struct specbinding *p; | |
830 | ||
831 | for (p = specpdl_ptr - 1; p >= specpdl; p--) | |
832 | if (p->func == NULL | |
833 | && (EQ (new_alias, | |
834 | CONSP (p->symbol) ? XCAR (p->symbol) : p->symbol))) | |
835 | error ("Don't know how to make a let-bound variable an alias"); | |
836 | } | |
837 | ||
b9598260 | 838 | sym->declared_special = 1; |
ce5b453a SM |
839 | sym->redirect = SYMBOL_VARALIAS; |
840 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
841 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
842 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
843 | /* Even if docstring is nil: remove old docstring. */ |
844 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 845 | |
4a9308b8 | 846 | return base_variable; |
19cebf5a GM |
847 | } |
848 | ||
849 | ||
db9f0278 | 850 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 851 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
9dbc9081 PJ |
852 | You are not required to define a variable in order to use it, |
853 | but the definition can supply documentation and an initial value | |
854 | in a way that tags can recognize. | |
855 | ||
856 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void. | |
857 | If SYMBOL is buffer-local, its default value is what is set; | |
858 | buffer-local values are not affected. | |
859 | INITVALUE and DOCSTRING are optional. | |
860 | If DOCSTRING starts with *, this variable is identified as a user option. | |
861 | This means that M-x set-variable recognizes it. | |
862 | See also `user-variable-p'. | |
863 | If INITVALUE is missing, SYMBOL's value is not set. | |
733f68b6 LT |
864 | |
865 | If SYMBOL has a local binding, then this form affects the local | |
866 | binding. This is usually not what you want. Thus, if you need to | |
867 | load a file defining variables, with this form or with `defconst' or | |
868 | `defcustom', you should always load that file _outside_ any bindings | |
869 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
870 | this respect.) | |
2df5238c | 871 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
9dbc9081 | 872 | (args) |
db9f0278 JB |
873 | Lisp_Object args; |
874 | { | |
a42ba017 | 875 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
876 | |
877 | sym = Fcar (args); | |
a42ba017 RS |
878 | tail = Fcdr (args); |
879 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 880 | error ("Too many arguments"); |
a42ba017 | 881 | |
33568849 | 882 | tem = Fdefault_boundp (sym); |
a42ba017 | 883 | if (!NILP (tail)) |
db9f0278 | 884 | { |
1c9916a1 SM |
885 | if (SYMBOL_CONSTANT_P (sym)) |
886 | { | |
887 | /* For upward compatibility, allow (defvar :foo (quote :foo)). */ | |
888 | Lisp_Object tem = Fcar (tail); | |
889 | if (! (CONSP (tem) | |
890 | && EQ (XCAR (tem), Qquote) | |
891 | && CONSP (XCDR (tem)) | |
892 | && EQ (XCAR (XCDR (tem)), sym))) | |
893 | error ("Constant symbol `%s' specified in defvar", | |
894 | SDATA (SYMBOL_NAME (sym))); | |
895 | } | |
896 | ||
265a9e55 | 897 | if (NILP (tem)) |
33568849 | 898 | Fset_default (sym, Feval (Fcar (tail))); |
d0bce91e SM |
899 | else |
900 | { /* Check if there is really a global binding rather than just a let | |
901 | binding that shadows the global unboundness of the var. */ | |
b28d0d9a | 902 | volatile struct specbinding *pdl = specpdl_ptr; |
d0bce91e SM |
903 | while (--pdl >= specpdl) |
904 | { | |
905 | if (EQ (pdl->symbol, sym) && !pdl->func | |
906 | && EQ (pdl->old_value, Qunbound)) | |
907 | { | |
908 | message_with_string ("Warning: defvar ignored because %s is let-bound", | |
909 | SYMBOL_NAME (sym), 1); | |
910 | break; | |
911 | } | |
912 | } | |
913 | } | |
33568849 | 914 | tail = Fcdr (tail); |
e509f168 SM |
915 | tem = Fcar (tail); |
916 | if (!NILP (tem)) | |
33568849 | 917 | { |
33568849 SM |
918 | if (!NILP (Vpurify_flag)) |
919 | tem = Fpurecopy (tem); | |
920 | Fput (sym, Qvariable_documentation, tem); | |
921 | } | |
6fd797f5 | 922 | LOADHIST_ATTACH (sym); |
db9f0278 | 923 | } |
33568849 | 924 | else |
d7c1d0fc RS |
925 | /* Simple (defvar <var>) should not count as a definition at all. |
926 | It could get in the way of other definitions, and unloading this | |
927 | package could try to make the variable unbound. */ | |
addf35fd | 928 | ; |
b9598260 SM |
929 | |
930 | if (SYMBOLP (sym)) | |
931 | XSYMBOL (sym)->declared_special = 1; | |
addf35fd | 932 | |
db9f0278 JB |
933 | return sym; |
934 | } | |
935 | ||
936 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 PJ |
937 | doc: /* Define SYMBOL as a constant variable. |
938 | The intent is that neither programs nor users should ever change this value. | |
939 | Always sets the value of SYMBOL to the result of evalling INITVALUE. | |
940 | If SYMBOL is buffer-local, its default value is what is set; | |
941 | buffer-local values are not affected. | |
942 | DOCSTRING is optional. | |
733f68b6 LT |
943 | |
944 | If SYMBOL has a local binding, then this form sets the local binding's | |
945 | value. However, you should normally not make local bindings for | |
946 | variables defined with this form. | |
7a25dc6d | 947 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
9dbc9081 | 948 | (args) |
db9f0278 JB |
949 | Lisp_Object args; |
950 | { | |
951 | register Lisp_Object sym, tem; | |
952 | ||
953 | sym = Fcar (args); | |
a42ba017 | 954 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 955 | error ("Too many arguments"); |
a42ba017 | 956 | |
1182a7cb DL |
957 | tem = Feval (Fcar (Fcdr (args))); |
958 | if (!NILP (Vpurify_flag)) | |
959 | tem = Fpurecopy (tem); | |
960 | Fset_default (sym, tem); | |
b9598260 | 961 | XSYMBOL (sym)->declared_special = 1; |
db9f0278 | 962 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 963 | if (!NILP (tem)) |
db9f0278 | 964 | { |
265a9e55 | 965 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
966 | tem = Fpurecopy (tem); |
967 | Fput (sym, Qvariable_documentation, tem); | |
968 | } | |
873759d5 | 969 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 970 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
971 | return sym; |
972 | } | |
973 | ||
606cdb89 JB |
974 | /* Error handler used in Fuser_variable_p. */ |
975 | static Lisp_Object | |
976 | user_variable_p_eh (ignore) | |
977 | Lisp_Object ignore; | |
978 | { | |
979 | return Qnil; | |
980 | } | |
981 | ||
40a69fac SM |
982 | static Lisp_Object |
983 | lisp_indirect_variable (Lisp_Object sym) | |
984 | { | |
985 | XSETSYMBOL (sym, indirect_variable (XSYMBOL (sym))); | |
986 | return sym; | |
987 | } | |
988 | ||
db9f0278 | 989 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, |
606cdb89 | 990 | doc: /* Return t if VARIABLE is intended to be set and modified by users. |
9dbc9081 | 991 | \(The alternative is a variable used internally in a Lisp program.) |
606cdb89 JB |
992 | A variable is a user variable if |
993 | \(1) the first character of its documentation is `*', or | |
994 | \(2) it is customizable (its property list contains a non-nil value | |
995 | of `standard-value' or `custom-autoload'), or | |
996 | \(3) it is an alias for another user variable. | |
997 | Return nil if VARIABLE is an alias and there is a loop in the | |
998 | chain of symbols. */) | |
9dbc9081 | 999 | (variable) |
db9f0278 JB |
1000 | Lisp_Object variable; |
1001 | { | |
1002 | Lisp_Object documentation; | |
177c0ea7 | 1003 | |
5e78e475 RS |
1004 | if (!SYMBOLP (variable)) |
1005 | return Qnil; | |
1006 | ||
606cdb89 | 1007 | /* If indirect and there's an alias loop, don't check anything else. */ |
ce5b453a | 1008 | if (XSYMBOL (variable)->redirect == SYMBOL_VARALIAS |
40a69fac | 1009 | && NILP (internal_condition_case_1 (lisp_indirect_variable, variable, |
606cdb89 JB |
1010 | Qt, user_variable_p_eh))) |
1011 | return Qnil; | |
1012 | ||
1013 | while (1) | |
1014 | { | |
1015 | documentation = Fget (variable, Qvariable_documentation); | |
1016 | if (INTEGERP (documentation) && XINT (documentation) < 0) | |
1017 | return Qt; | |
1018 | if (STRINGP (documentation) | |
1019 | && ((unsigned char) SREF (documentation, 0) == '*')) | |
1020 | return Qt; | |
1021 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ | |
1022 | if (CONSP (documentation) | |
1023 | && STRINGP (XCAR (documentation)) | |
1024 | && INTEGERP (XCDR (documentation)) | |
1025 | && XINT (XCDR (documentation)) < 0) | |
1026 | return Qt; | |
1027 | /* Customizable? See `custom-variable-p'. */ | |
1028 | if ((!NILP (Fget (variable, intern ("standard-value")))) | |
1029 | || (!NILP (Fget (variable, intern ("custom-autoload"))))) | |
1030 | return Qt; | |
1031 | ||
ce5b453a | 1032 | if (!(XSYMBOL (variable)->redirect == SYMBOL_VARALIAS)) |
606cdb89 JB |
1033 | return Qnil; |
1034 | ||
1035 | /* An indirect variable? Let's follow the chain. */ | |
ce5b453a | 1036 | XSETSYMBOL (variable, SYMBOL_ALIAS (XSYMBOL (variable))); |
606cdb89 | 1037 | } |
177c0ea7 | 1038 | } |
db9f0278 JB |
1039 | \f |
1040 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1041 | doc: /* Bind variables according to VARLIST then eval BODY. |
1042 | The value of the last form in BODY is returned. | |
1043 | Each element of VARLIST is a symbol (which is bound to nil) | |
1044 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1045 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 1046 | usage: (let* VARLIST BODY...) */) |
9dbc9081 | 1047 | (args) |
db9f0278 JB |
1048 | Lisp_Object args; |
1049 | { | |
b9598260 | 1050 | Lisp_Object varlist, var, val, elt, lexenv; |
aed13378 | 1051 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
1052 | struct gcpro gcpro1, gcpro2, gcpro3; |
1053 | ||
1054 | GCPRO3 (args, elt, varlist); | |
1055 | ||
b9598260 SM |
1056 | lexenv = Vinternal_interpreter_environment; |
1057 | ||
db9f0278 | 1058 | varlist = Fcar (args); |
b9598260 | 1059 | while (CONSP (varlist)) |
db9f0278 JB |
1060 | { |
1061 | QUIT; | |
b9598260 SM |
1062 | |
1063 | elt = XCAR (varlist); | |
90165123 | 1064 | if (SYMBOLP (elt)) |
b9598260 SM |
1065 | { |
1066 | var = elt; | |
1067 | val = Qnil; | |
1068 | } | |
08564963 | 1069 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1070 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1071 | else |
1072 | { | |
b9598260 | 1073 | var = Fcar (elt); |
db9f0278 | 1074 | val = Feval (Fcar (Fcdr (elt))); |
db9f0278 | 1075 | } |
b9598260 SM |
1076 | |
1077 | if (!NILP (lexenv) && SYMBOLP (var) && !XSYMBOL (var)->declared_special) | |
1078 | /* Lexically bind VAR by adding it to the interpreter's binding | |
1079 | alist. */ | |
1080 | { | |
1081 | lexenv = Fcons (Fcons (var, val), lexenv); | |
1082 | specbind (Qinternal_interpreter_environment, lexenv); | |
1083 | } | |
1084 | else | |
1085 | specbind (var, val); | |
1086 | ||
1087 | varlist = XCDR (varlist); | |
db9f0278 | 1088 | } |
b9598260 | 1089 | |
db9f0278 | 1090 | UNGCPRO; |
b9598260 | 1091 | |
db9f0278 | 1092 | val = Fprogn (Fcdr (args)); |
b9598260 | 1093 | |
db9f0278 JB |
1094 | return unbind_to (count, val); |
1095 | } | |
1096 | ||
1097 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1098 | doc: /* Bind variables according to VARLIST then eval BODY. |
1099 | The value of the last form in BODY is returned. | |
1100 | Each element of VARLIST is a symbol (which is bound to nil) | |
1101 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
1102 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 1103 | usage: (let VARLIST BODY...) */) |
9dbc9081 | 1104 | (args) |
db9f0278 JB |
1105 | Lisp_Object args; |
1106 | { | |
b9598260 | 1107 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 1108 | register Lisp_Object elt, varlist; |
aed13378 | 1109 | int count = SPECPDL_INDEX (); |
db9f0278 JB |
1110 | register int argnum; |
1111 | struct gcpro gcpro1, gcpro2; | |
1112 | ||
1113 | varlist = Fcar (args); | |
1114 | ||
1115 | /* Make space to hold the values to give the bound variables */ | |
1116 | elt = Flength (varlist); | |
1117 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
1118 | ||
1119 | /* Compute the values and store them in `temps' */ | |
1120 | ||
1121 | GCPRO2 (args, *temps); | |
1122 | gcpro2.nvars = 0; | |
1123 | ||
67ee9f6e | 1124 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
1125 | { |
1126 | QUIT; | |
67ee9f6e | 1127 | elt = XCAR (varlist); |
90165123 | 1128 | if (SYMBOLP (elt)) |
db9f0278 | 1129 | temps [argnum++] = Qnil; |
08564963 | 1130 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 1131 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
1132 | else |
1133 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
1134 | gcpro2.nvars = argnum; | |
1135 | } | |
1136 | UNGCPRO; | |
1137 | ||
b9598260 SM |
1138 | lexenv = Vinternal_interpreter_environment; |
1139 | ||
db9f0278 | 1140 | varlist = Fcar (args); |
67ee9f6e | 1141 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 1142 | { |
b9598260 SM |
1143 | Lisp_Object var; |
1144 | ||
67ee9f6e | 1145 | elt = XCAR (varlist); |
b9598260 | 1146 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 1147 | tem = temps[argnum++]; |
b9598260 SM |
1148 | |
1149 | if (!NILP (lexenv) && SYMBOLP (var) && !XSYMBOL (var)->declared_special) | |
1150 | /* Lexically bind VAR by adding it to the lexenv alist. */ | |
1151 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 1152 | else |
b9598260 SM |
1153 | /* Dynamically bind VAR. */ |
1154 | specbind (var, tem); | |
db9f0278 JB |
1155 | } |
1156 | ||
b9598260 SM |
1157 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
1158 | /* Instantiate a new lexical environment. */ | |
1159 | specbind (Qinternal_interpreter_environment, lexenv); | |
1160 | ||
db9f0278 | 1161 | elt = Fprogn (Fcdr (args)); |
b9598260 | 1162 | |
db9f0278 JB |
1163 | return unbind_to (count, elt); |
1164 | } | |
1165 | ||
1166 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1167 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
1168 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
1169 | until TEST returns nil. | |
7a25dc6d | 1170 | usage: (while TEST BODY...) */) |
9dbc9081 | 1171 | (args) |
db9f0278 JB |
1172 | Lisp_Object args; |
1173 | { | |
2b9bde76 | 1174 | Lisp_Object test, body; |
db9f0278 JB |
1175 | struct gcpro gcpro1, gcpro2; |
1176 | ||
1177 | GCPRO2 (test, body); | |
1178 | ||
1179 | test = Fcar (args); | |
1180 | body = Fcdr (args); | |
2b9bde76 | 1181 | while (!NILP (Feval (test))) |
db9f0278 JB |
1182 | { |
1183 | QUIT; | |
1184 | Fprogn (body); | |
1185 | } | |
1186 | ||
1187 | UNGCPRO; | |
1188 | return Qnil; | |
1189 | } | |
1190 | ||
1191 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
1192 | doc: /* Return result of expanding macros at top level of FORM. |
1193 | If FORM is not a macro call, it is returned unchanged. | |
1194 | Otherwise, the macro is expanded and the expansion is considered | |
1195 | in place of FORM. When a non-macro-call results, it is returned. | |
1196 | ||
1197 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1198 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
1199 | (form, environment) | |
2e267a2e | 1200 | Lisp_Object form; |
79e8bfbf | 1201 | Lisp_Object environment; |
db9f0278 | 1202 | { |
23d6b5a6 | 1203 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1204 | register Lisp_Object expander, sym, def, tem; |
1205 | ||
1206 | while (1) | |
1207 | { | |
1208 | /* Come back here each time we expand a macro call, | |
1209 | in case it expands into another macro call. */ | |
90165123 | 1210 | if (!CONSP (form)) |
db9f0278 | 1211 | break; |
23d6b5a6 | 1212 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1213 | def = sym = XCAR (form); |
23d6b5a6 | 1214 | tem = Qnil; |
db9f0278 JB |
1215 | /* Trace symbols aliases to other symbols |
1216 | until we get a symbol that is not an alias. */ | |
90165123 | 1217 | while (SYMBOLP (def)) |
db9f0278 JB |
1218 | { |
1219 | QUIT; | |
23d6b5a6 | 1220 | sym = def; |
79e8bfbf | 1221 | tem = Fassq (sym, environment); |
265a9e55 | 1222 | if (NILP (tem)) |
db9f0278 JB |
1223 | { |
1224 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
1225 | if (!EQ (def, Qunbound)) |
1226 | continue; | |
db9f0278 | 1227 | } |
23d6b5a6 | 1228 | break; |
db9f0278 | 1229 | } |
79e8bfbf | 1230 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1231 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1232 | if (NILP (tem)) |
db9f0278 | 1233 | { |
79e8bfbf | 1234 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1235 | Look at its function definition. */ |
90165123 | 1236 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
1237 | /* Not defined or definition not suitable */ |
1238 | break; | |
03699b14 | 1239 | if (EQ (XCAR (def), Qautoload)) |
db9f0278 JB |
1240 | { |
1241 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 1242 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 1243 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
1244 | /* Yes, load it and try again. */ |
1245 | { | |
ca20916b RS |
1246 | struct gcpro gcpro1; |
1247 | GCPRO1 (form); | |
ee9ee63c | 1248 | do_autoload (def, sym); |
ca20916b | 1249 | UNGCPRO; |
ee9ee63c JB |
1250 | continue; |
1251 | } | |
1252 | else | |
db9f0278 | 1253 | break; |
db9f0278 | 1254 | } |
03699b14 | 1255 | else if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1256 | break; |
03699b14 | 1257 | else expander = XCDR (def); |
db9f0278 JB |
1258 | } |
1259 | else | |
1260 | { | |
03699b14 | 1261 | expander = XCDR (tem); |
265a9e55 | 1262 | if (NILP (expander)) |
db9f0278 JB |
1263 | break; |
1264 | } | |
03699b14 | 1265 | form = apply1 (expander, XCDR (form)); |
db9f0278 JB |
1266 | } |
1267 | return form; | |
1268 | } | |
1269 | \f | |
1270 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1271 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1272 | TAG is evalled to get the tag to use; it must not be nil. | |
1273 | ||
1274 | Then the BODY is executed. | |
1d632ccf | 1275 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1276 | If no throw happens, `catch' returns the value of the last BODY form. |
1277 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1278 | usage: (catch TAG BODY...) */) |
9dbc9081 | 1279 | (args) |
db9f0278 JB |
1280 | Lisp_Object args; |
1281 | { | |
1282 | register Lisp_Object tag; | |
1283 | struct gcpro gcpro1; | |
1284 | ||
1285 | GCPRO1 (args); | |
1286 | tag = Feval (Fcar (args)); | |
1287 | UNGCPRO; | |
1288 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1289 | } | |
1290 | ||
1291 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1292 | FUNC should return a Lisp_Object. | |
1293 | This is how catches are done from within C code. */ | |
1294 | ||
1295 | Lisp_Object | |
1296 | internal_catch (tag, func, arg) | |
1297 | Lisp_Object tag; | |
1298 | Lisp_Object (*func) (); | |
1299 | Lisp_Object arg; | |
1300 | { | |
1301 | /* This structure is made part of the chain `catchlist'. */ | |
1302 | struct catchtag c; | |
1303 | ||
1304 | /* Fill in the components of c, and put it on the list. */ | |
1305 | c.next = catchlist; | |
1306 | c.tag = tag; | |
1307 | c.val = Qnil; | |
1308 | c.backlist = backtrace_list; | |
1309 | c.handlerlist = handlerlist; | |
1310 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1311 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1312 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1313 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1314 | c.gcpro = gcprolist; |
bcf28080 | 1315 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1316 | catchlist = &c; |
1317 | ||
1318 | /* Call FUNC. */ | |
1319 | if (! _setjmp (c.jmp)) | |
1320 | c.val = (*func) (arg); | |
1321 | ||
1322 | /* Throw works by a longjmp that comes right here. */ | |
1323 | catchlist = c.next; | |
1324 | return c.val; | |
1325 | } | |
1326 | ||
ba410f40 JB |
1327 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1328 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1329 | |
ba410f40 JB |
1330 | This is the guts Fthrow and Fsignal; they differ only in the way |
1331 | they choose the catch tag to throw to. A catch tag for a | |
1332 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1333 | |
ba410f40 JB |
1334 | Before each catch is discarded, unbind all special bindings and |
1335 | execute all unwind-protect clauses made above that catch. Unwind | |
1336 | the handler stack as we go, so that the proper handlers are in | |
1337 | effect for each unwind-protect clause we run. At the end, restore | |
1338 | some static info saved in CATCH, and longjmp to the location | |
1339 | specified in the | |
1340 | ||
1341 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
1342 | |
1343 | static void | |
ba410f40 | 1344 | unwind_to_catch (catch, value) |
db9f0278 | 1345 | struct catchtag *catch; |
ba410f40 | 1346 | Lisp_Object value; |
db9f0278 JB |
1347 | { |
1348 | register int last_time; | |
1349 | ||
ba410f40 JB |
1350 | /* Save the value in the tag. */ |
1351 | catch->val = value; | |
1352 | ||
0b31741c | 1353 | /* Restore certain special C variables. */ |
1cdc3155 | 1354 | set_poll_suppress_count (catch->poll_suppress_count); |
c1788fbc | 1355 | UNBLOCK_INPUT_TO (catch->interrupt_input_blocked); |
0b31741c | 1356 | handling_signal = 0; |
69bbd6bd | 1357 | immediate_quit = 0; |
82da7701 | 1358 | |
db9f0278 JB |
1359 | do |
1360 | { | |
1361 | last_time = catchlist == catch; | |
82da7701 JB |
1362 | |
1363 | /* Unwind the specpdl stack, and then restore the proper set of | |
1364 | handlers. */ | |
db9f0278 JB |
1365 | unbind_to (catchlist->pdlcount, Qnil); |
1366 | handlerlist = catchlist->handlerlist; | |
1367 | catchlist = catchlist->next; | |
1368 | } | |
1369 | while (! last_time); | |
1370 | ||
a2a103bb | 1371 | #if HAVE_X_WINDOWS |
88019a63 RS |
1372 | /* If x_catch_errors was done, turn it off now. |
1373 | (First we give unbind_to a chance to do that.) */ | |
e6aee454 KL |
1374 | #if 0 /* This would disable x_catch_errors after x_connection_closed. |
1375 | * The catch must remain in effect during that delicate | |
1376 | * state. --lorentey */ | |
88019a63 | 1377 | x_fully_uncatch_errors (); |
e6aee454 | 1378 | #endif |
a2a103bb | 1379 | #endif |
88019a63 | 1380 | |
bcf28080 | 1381 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1382 | gcprolist = catch->gcpro; |
15934ffa RS |
1383 | #ifdef DEBUG_GCPRO |
1384 | if (gcprolist != 0) | |
1385 | gcpro_level = gcprolist->level + 1; | |
1386 | else | |
1387 | gcpro_level = 0; | |
1388 | #endif | |
db9f0278 JB |
1389 | backtrace_list = catch->backlist; |
1390 | lisp_eval_depth = catch->lisp_eval_depth; | |
177c0ea7 | 1391 | |
ba410f40 | 1392 | _longjmp (catch->jmp, 1); |
db9f0278 JB |
1393 | } |
1394 | ||
1395 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
9dbc9081 PJ |
1396 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1397 | Both TAG and VALUE are evalled. */) | |
1398 | (tag, value) | |
79e8bfbf | 1399 | register Lisp_Object tag, value; |
db9f0278 JB |
1400 | { |
1401 | register struct catchtag *c; | |
1402 | ||
8788120f KS |
1403 | if (!NILP (tag)) |
1404 | for (c = catchlist; c; c = c->next) | |
1405 | { | |
1406 | if (EQ (c->tag, tag)) | |
1407 | unwind_to_catch (c, value); | |
1408 | } | |
734d55a2 | 1409 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1410 | } |
1411 | ||
1412 | ||
1413 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1414 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1415 | If BODYFORM completes normally, its value is returned | |
1416 | after executing the UNWINDFORMS. | |
1417 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1418 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
9dbc9081 | 1419 | (args) |
db9f0278 JB |
1420 | Lisp_Object args; |
1421 | { | |
1422 | Lisp_Object val; | |
aed13378 | 1423 | int count = SPECPDL_INDEX (); |
db9f0278 | 1424 | |
04b28167 | 1425 | record_unwind_protect (Fprogn, Fcdr (args)); |
db9f0278 | 1426 | val = Feval (Fcar (args)); |
177c0ea7 | 1427 | return unbind_to (count, val); |
db9f0278 JB |
1428 | } |
1429 | \f | |
1430 | /* Chain of condition handlers currently in effect. | |
1431 | The elements of this chain are contained in the stack frames | |
1432 | of Fcondition_case and internal_condition_case. | |
1433 | When an error is signaled (by calling Fsignal, below), | |
1434 | this chain is searched for an element that applies. */ | |
1435 | ||
1436 | struct handler *handlerlist; | |
1437 | ||
1438 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
9dbc9081 | 1439 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1440 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1441 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1442 | where the BODY is made of Lisp expressions. | |
1443 | ||
1444 | A handler is applicable to an error | |
1445 | if CONDITION-NAME is one of the error's condition names. | |
1446 | If an error happens, the first applicable handler is run. | |
1447 | ||
1448 | The car of a handler may be a list of condition names | |
c997bb25 | 1449 | instead of a single condition name. Then it handles all of them. |
9dbc9081 | 1450 | |
c997bb25 RS |
1451 | When a handler handles an error, control returns to the `condition-case' |
1452 | and it executes the handler's BODY... | |
d0acbbaf | 1453 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
c997bb25 RS |
1454 | (If VAR is nil, the handler can't access that information.) |
1455 | Then the value of the last BODY form is returned from the `condition-case' | |
1456 | expression. | |
9dbc9081 | 1457 | |
9dbc9081 | 1458 | See also the function `signal' for more info. |
2b47b74d | 1459 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
9dbc9081 | 1460 | (args) |
db9f0278 JB |
1461 | Lisp_Object args; |
1462 | { | |
17401c97 GM |
1463 | register Lisp_Object bodyform, handlers; |
1464 | volatile Lisp_Object var; | |
db9f0278 | 1465 | |
82da7701 JB |
1466 | var = Fcar (args); |
1467 | bodyform = Fcar (Fcdr (args)); | |
1468 | handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1469 | |
1470 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1471 | } | |
1472 | ||
1473 | /* Like Fcondition_case, but the args are separate | |
1474 | rather than passed in a list. Used by Fbyte_code. */ | |
1475 | ||
1476 | Lisp_Object | |
1477 | internal_lisp_condition_case (var, bodyform, handlers) | |
1478 | volatile Lisp_Object var; | |
1479 | Lisp_Object bodyform, handlers; | |
1480 | { | |
1481 | Lisp_Object val; | |
1482 | struct catchtag c; | |
1483 | struct handler h; | |
1484 | ||
b7826503 | 1485 | CHECK_SYMBOL (var); |
82da7701 | 1486 | |
2b47b74d | 1487 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1488 | { |
1489 | Lisp_Object tem; | |
2b47b74d | 1490 | tem = XCAR (val); |
5f96776a RS |
1491 | if (! (NILP (tem) |
1492 | || (CONSP (tem) | |
03699b14 KR |
1493 | && (SYMBOLP (XCAR (tem)) |
1494 | || CONSP (XCAR (tem)))))) | |
82da7701 JB |
1495 | error ("Invalid condition handler", tem); |
1496 | } | |
db9f0278 JB |
1497 | |
1498 | c.tag = Qnil; | |
1499 | c.val = Qnil; | |
1500 | c.backlist = backtrace_list; | |
1501 | c.handlerlist = handlerlist; | |
1502 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1503 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1504 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1505 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1506 | c.gcpro = gcprolist; |
bcf28080 | 1507 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1508 | if (_setjmp (c.jmp)) |
1509 | { | |
265a9e55 | 1510 | if (!NILP (h.var)) |
9d58218c RS |
1511 | specbind (h.var, c.val); |
1512 | val = Fprogn (Fcdr (h.chosen_clause)); | |
82da7701 JB |
1513 | |
1514 | /* Note that this just undoes the binding of h.var; whoever | |
1515 | longjumped to us unwound the stack to c.pdlcount before | |
1516 | throwing. */ | |
db9f0278 JB |
1517 | unbind_to (c.pdlcount, Qnil); |
1518 | return val; | |
1519 | } | |
1520 | c.next = catchlist; | |
1521 | catchlist = &c; | |
177c0ea7 | 1522 | |
82da7701 JB |
1523 | h.var = var; |
1524 | h.handler = handlers; | |
db9f0278 | 1525 | h.next = handlerlist; |
db9f0278 JB |
1526 | h.tag = &c; |
1527 | handlerlist = &h; | |
1528 | ||
82da7701 | 1529 | val = Feval (bodyform); |
db9f0278 JB |
1530 | catchlist = c.next; |
1531 | handlerlist = h.next; | |
1532 | return val; | |
1533 | } | |
1534 | ||
f029ca5f RS |
1535 | /* Call the function BFUN with no arguments, catching errors within it |
1536 | according to HANDLERS. If there is an error, call HFUN with | |
1537 | one argument which is the data that describes the error: | |
1538 | (SIGNALNAME . DATA) | |
1539 | ||
1540 | HANDLERS can be a list of conditions to catch. | |
1541 | If HANDLERS is Qt, catch all errors. | |
1542 | If HANDLERS is Qerror, catch all errors | |
1543 | but allow the debugger to run if that is enabled. */ | |
1544 | ||
db9f0278 JB |
1545 | Lisp_Object |
1546 | internal_condition_case (bfun, handlers, hfun) | |
1547 | Lisp_Object (*bfun) (); | |
1548 | Lisp_Object handlers; | |
1549 | Lisp_Object (*hfun) (); | |
1550 | { | |
1551 | Lisp_Object val; | |
1552 | struct catchtag c; | |
1553 | struct handler h; | |
1554 | ||
88019a63 RS |
1555 | /* Since Fsignal will close off all calls to x_catch_errors, |
1556 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1557 | #if HAVE_X_WINDOWS |
88019a63 | 1558 | if (x_catching_errors ()) |
01591d17 | 1559 | abort (); |
a2a103bb | 1560 | #endif |
01591d17 | 1561 | |
db9f0278 JB |
1562 | c.tag = Qnil; |
1563 | c.val = Qnil; | |
1564 | c.backlist = backtrace_list; | |
1565 | c.handlerlist = handlerlist; | |
1566 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1567 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1568 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1569 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1570 | c.gcpro = gcprolist; |
bcf28080 | 1571 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1572 | if (_setjmp (c.jmp)) |
1573 | { | |
9d58218c | 1574 | return (*hfun) (c.val); |
db9f0278 JB |
1575 | } |
1576 | c.next = catchlist; | |
1577 | catchlist = &c; | |
1578 | h.handler = handlers; | |
1579 | h.var = Qnil; | |
db9f0278 JB |
1580 | h.next = handlerlist; |
1581 | h.tag = &c; | |
1582 | handlerlist = &h; | |
1583 | ||
1584 | val = (*bfun) (); | |
1585 | catchlist = c.next; | |
1586 | handlerlist = h.next; | |
1587 | return val; | |
1588 | } | |
1589 | ||
2659a09f | 1590 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1591 | |
d227775c RS |
1592 | Lisp_Object |
1593 | internal_condition_case_1 (bfun, arg, handlers, hfun) | |
1594 | Lisp_Object (*bfun) (); | |
1595 | Lisp_Object arg; | |
1596 | Lisp_Object handlers; | |
1597 | Lisp_Object (*hfun) (); | |
1598 | { | |
1599 | Lisp_Object val; | |
1600 | struct catchtag c; | |
1601 | struct handler h; | |
1602 | ||
88019a63 RS |
1603 | /* Since Fsignal will close off all calls to x_catch_errors, |
1604 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1605 | #if HAVE_X_WINDOWS |
88019a63 RS |
1606 | if (x_catching_errors ()) |
1607 | abort (); | |
a2a103bb | 1608 | #endif |
88019a63 | 1609 | |
d227775c RS |
1610 | c.tag = Qnil; |
1611 | c.val = Qnil; | |
1612 | c.backlist = backtrace_list; | |
1613 | c.handlerlist = handlerlist; | |
1614 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1615 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1616 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1617 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1618 | c.gcpro = gcprolist; |
bcf28080 | 1619 | c.byte_stack = byte_stack_list; |
d227775c RS |
1620 | if (_setjmp (c.jmp)) |
1621 | { | |
9d58218c | 1622 | return (*hfun) (c.val); |
d227775c RS |
1623 | } |
1624 | c.next = catchlist; | |
1625 | catchlist = &c; | |
1626 | h.handler = handlers; | |
1627 | h.var = Qnil; | |
1628 | h.next = handlerlist; | |
1629 | h.tag = &c; | |
1630 | handlerlist = &h; | |
1631 | ||
1632 | val = (*bfun) (arg); | |
1633 | catchlist = c.next; | |
1634 | handlerlist = h.next; | |
1635 | return val; | |
1636 | } | |
10b29d41 | 1637 | |
53967e09 CY |
1638 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1639 | its arguments. */ | |
1640 | ||
1641 | Lisp_Object | |
178f2507 SM |
1642 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1643 | Lisp_Object arg1, | |
1644 | Lisp_Object arg2, | |
1645 | Lisp_Object handlers, | |
1646 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1647 | { |
1648 | Lisp_Object val; | |
1649 | struct catchtag c; | |
1650 | struct handler h; | |
1651 | ||
1652 | /* Since Fsignal will close off all calls to x_catch_errors, | |
1653 | we will get the wrong results if some are not closed now. */ | |
1654 | #if HAVE_X_WINDOWS | |
1655 | if (x_catching_errors ()) | |
1656 | abort (); | |
1657 | #endif | |
1658 | ||
1659 | c.tag = Qnil; | |
1660 | c.val = Qnil; | |
1661 | c.backlist = backtrace_list; | |
1662 | c.handlerlist = handlerlist; | |
1663 | c.lisp_eval_depth = lisp_eval_depth; | |
1664 | c.pdlcount = SPECPDL_INDEX (); | |
1665 | c.poll_suppress_count = poll_suppress_count; | |
1666 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1667 | c.gcpro = gcprolist; | |
1668 | c.byte_stack = byte_stack_list; | |
1669 | if (_setjmp (c.jmp)) | |
1670 | { | |
1671 | return (*hfun) (c.val); | |
1672 | } | |
1673 | c.next = catchlist; | |
1674 | catchlist = &c; | |
1675 | h.handler = handlers; | |
1676 | h.var = Qnil; | |
1677 | h.next = handlerlist; | |
1678 | h.tag = &c; | |
1679 | handlerlist = &h; | |
1680 | ||
1681 | val = (*bfun) (arg1, arg2); | |
1682 | catchlist = c.next; | |
1683 | handlerlist = h.next; | |
1684 | return val; | |
1685 | } | |
10b29d41 | 1686 | |
2659a09f | 1687 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1688 | and ARGS as second argument. */ |
1689 | ||
1690 | Lisp_Object | |
178f2507 SM |
1691 | internal_condition_case_n (Lisp_Object (*bfun) (int, Lisp_Object*), |
1692 | int nargs, | |
1693 | Lisp_Object *args, | |
1694 | Lisp_Object handlers, | |
1695 | Lisp_Object (*hfun) (Lisp_Object)) | |
10b29d41 GM |
1696 | { |
1697 | Lisp_Object val; | |
1698 | struct catchtag c; | |
1699 | struct handler h; | |
1700 | ||
88019a63 RS |
1701 | /* Since Fsignal will close off all calls to x_catch_errors, |
1702 | we will get the wrong results if some are not closed now. */ | |
a2a103bb | 1703 | #if HAVE_X_WINDOWS |
88019a63 RS |
1704 | if (x_catching_errors ()) |
1705 | abort (); | |
a2a103bb | 1706 | #endif |
88019a63 | 1707 | |
10b29d41 GM |
1708 | c.tag = Qnil; |
1709 | c.val = Qnil; | |
1710 | c.backlist = backtrace_list; | |
1711 | c.handlerlist = handlerlist; | |
1712 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1713 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1714 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1715 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1716 | c.gcpro = gcprolist; |
1717 | c.byte_stack = byte_stack_list; | |
1718 | if (_setjmp (c.jmp)) | |
1719 | { | |
1720 | return (*hfun) (c.val); | |
1721 | } | |
1722 | c.next = catchlist; | |
1723 | catchlist = &c; | |
1724 | h.handler = handlers; | |
1725 | h.var = Qnil; | |
1726 | h.next = handlerlist; | |
1727 | h.tag = &c; | |
1728 | handlerlist = &h; | |
1729 | ||
1730 | val = (*bfun) (nargs, args); | |
1731 | catchlist = c.next; | |
1732 | handlerlist = h.next; | |
1733 | return val; | |
1734 | } | |
1735 | ||
d227775c | 1736 | \f |
2901f1d1 | 1737 | static Lisp_Object find_handler_clause P_ ((Lisp_Object, Lisp_Object, |
f01cbfdd | 1738 | Lisp_Object, Lisp_Object)); |
db9f0278 JB |
1739 | |
1740 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
9dbc9081 PJ |
1741 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1742 | This function does not return. | |
1743 | ||
1744 | An error symbol is a symbol with an `error-conditions' property | |
1745 | that is a list of condition names. | |
1746 | A handler for any of those names will get to handle this signal. | |
1747 | The symbol `error' should normally be one of them. | |
1748 | ||
1749 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1750 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1751 | error message is constructed. | |
9dbc9081 PJ |
1752 | If the signal is handled, DATA is made available to the handler. |
1753 | See also the function `condition-case'. */) | |
1754 | (error_symbol, data) | |
4200e719 | 1755 | Lisp_Object error_symbol, data; |
db9f0278 | 1756 | { |
bfa8ca43 | 1757 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1758 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1759 | That is a special case--don't do this in other situations. */ | |
db9f0278 JB |
1760 | register struct handler *allhandlers = handlerlist; |
1761 | Lisp_Object conditions; | |
1762 | extern int gc_in_progress; | |
1763 | extern int waiting_for_input; | |
c11d3d17 | 1764 | Lisp_Object string; |
1ea9dec4 | 1765 | Lisp_Object real_error_symbol; |
a2ff3819 | 1766 | struct backtrace *bp; |
db9f0278 | 1767 | |
346598f1 | 1768 | immediate_quit = handling_signal = 0; |
d063129f | 1769 | abort_on_gc = 0; |
db9f0278 JB |
1770 | if (gc_in_progress || waiting_for_input) |
1771 | abort (); | |
1772 | ||
1ea9dec4 RS |
1773 | if (NILP (error_symbol)) |
1774 | real_error_symbol = Fcar (data); | |
1775 | else | |
1776 | real_error_symbol = error_symbol; | |
1777 | ||
26631f2b RS |
1778 | #if 0 /* rms: I don't know why this was here, |
1779 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1780 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1781 | if (display_hourglass_p) |
1782 | cancel_hourglass (); | |
48f8dfa3 | 1783 | #endif |
177c0ea7 | 1784 | #endif |
48f8dfa3 | 1785 | |
61ede770 | 1786 | /* This hook is used by edebug. */ |
26631f2b RS |
1787 | if (! NILP (Vsignal_hook_function) |
1788 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1789 | { |
1790 | /* Edebug takes care of restoring these variables when it exits. */ | |
1791 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1792 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1793 | ||
1794 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1795 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1796 | ||
1797 | call2 (Vsignal_hook_function, error_symbol, data); | |
1798 | } | |
61ede770 | 1799 | |
1ea9dec4 | 1800 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1801 | |
a2ff3819 GM |
1802 | /* Remember from where signal was called. Skip over the frame for |
1803 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1804 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1805 | is a memory-full error. */ | |
090a072f | 1806 | Vsignaling_function = Qnil; |
26631f2b | 1807 | if (backtrace_list && !NILP (error_symbol)) |
090a072f GM |
1808 | { |
1809 | bp = backtrace_list->next; | |
1810 | if (bp && bp->function && EQ (*bp->function, Qerror)) | |
1811 | bp = bp->next; | |
1812 | if (bp && bp->function) | |
1813 | Vsignaling_function = *bp->function; | |
1814 | } | |
a2ff3819 | 1815 | |
db9f0278 JB |
1816 | for (; handlerlist; handlerlist = handlerlist->next) |
1817 | { | |
1818 | register Lisp_Object clause; | |
177c0ea7 | 1819 | |
db9f0278 | 1820 | clause = find_handler_clause (handlerlist->handler, conditions, |
f01cbfdd | 1821 | error_symbol, data); |
db9f0278 | 1822 | |
db9f0278 | 1823 | if (EQ (clause, Qlambda)) |
82da7701 | 1824 | { |
690337b7 KH |
1825 | /* We can't return values to code which signaled an error, but we |
1826 | can continue code which has signaled a quit. */ | |
1ea9dec4 | 1827 | if (EQ (real_error_symbol, Qquit)) |
82da7701 JB |
1828 | return Qnil; |
1829 | else | |
d3e6f8be | 1830 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1831 | } |
db9f0278 | 1832 | |
265a9e55 | 1833 | if (!NILP (clause)) |
db9f0278 | 1834 | { |
9d58218c | 1835 | Lisp_Object unwind_data; |
db9f0278 | 1836 | struct handler *h = handlerlist; |
9d58218c | 1837 | |
db9f0278 | 1838 | handlerlist = allhandlers; |
1ea9dec4 RS |
1839 | |
1840 | if (NILP (error_symbol)) | |
1841 | unwind_data = data; | |
9d58218c RS |
1842 | else |
1843 | unwind_data = Fcons (error_symbol, data); | |
1844 | h->chosen_clause = clause; | |
1845 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1846 | } |
1847 | } | |
1848 | ||
1849 | handlerlist = allhandlers; | |
1850 | /* If no handler is present now, try to run the debugger, | |
1851 | and if that fails, throw to top level. */ | |
f01cbfdd | 1852 | find_handler_clause (Qerror, conditions, error_symbol, data); |
c11d3d17 RS |
1853 | if (catchlist != 0) |
1854 | Fthrow (Qtop_level, Qt); | |
1855 | ||
1ea9dec4 | 1856 | if (! NILP (error_symbol)) |
c11d3d17 RS |
1857 | data = Fcons (error_symbol, data); |
1858 | ||
1859 | string = Ferror_message_string (data); | |
d5db4077 | 1860 | fatal ("%s", SDATA (string), 0); |
db9f0278 JB |
1861 | } |
1862 | ||
734d55a2 KS |
1863 | /* Internal version of Fsignal that never returns. |
1864 | Used for anything but Qquit (which can return from Fsignal). */ | |
1865 | ||
1866 | void | |
1867 | xsignal (error_symbol, data) | |
1868 | Lisp_Object error_symbol, data; | |
1869 | { | |
1870 | Fsignal (error_symbol, data); | |
1871 | abort (); | |
1872 | } | |
1873 | ||
1874 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1875 | ||
1876 | void | |
1877 | xsignal0 (error_symbol) | |
1878 | Lisp_Object error_symbol; | |
1879 | { | |
1880 | xsignal (error_symbol, Qnil); | |
1881 | } | |
1882 | ||
1883 | void | |
1884 | xsignal1 (error_symbol, arg) | |
1885 | Lisp_Object error_symbol, arg; | |
1886 | { | |
1887 | xsignal (error_symbol, list1 (arg)); | |
1888 | } | |
1889 | ||
1890 | void | |
1891 | xsignal2 (error_symbol, arg1, arg2) | |
1892 | Lisp_Object error_symbol, arg1, arg2; | |
1893 | { | |
1894 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1895 | } | |
1896 | ||
1897 | void | |
1898 | xsignal3 (error_symbol, arg1, arg2, arg3) | |
1899 | Lisp_Object error_symbol, arg1, arg2, arg3; | |
1900 | { | |
1901 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1902 | } | |
1903 | ||
1904 | /* Signal `error' with message S, and additional arg ARG. | |
1905 | If ARG is not a genuine list, make it a one-element list. */ | |
1906 | ||
1907 | void | |
1908 | signal_error (s, arg) | |
1909 | char *s; | |
1910 | Lisp_Object arg; | |
1911 | { | |
1912 | Lisp_Object tortoise, hare; | |
1913 | ||
1914 | hare = tortoise = arg; | |
1915 | while (CONSP (hare)) | |
1916 | { | |
1917 | hare = XCDR (hare); | |
1918 | if (!CONSP (hare)) | |
1919 | break; | |
1920 | ||
1921 | hare = XCDR (hare); | |
1922 | tortoise = XCDR (tortoise); | |
1923 | ||
1924 | if (EQ (hare, tortoise)) | |
1925 | break; | |
1926 | } | |
1927 | ||
1928 | if (!NILP (hare)) | |
1929 | arg = Fcons (arg, Qnil); /* Make it a list. */ | |
1930 | ||
1931 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1932 | } | |
1933 | ||
1934 | ||
e0f24100 | 1935 | /* Return nonzero if LIST is a non-nil atom or |
128c0f66 RM |
1936 | a list containing one of CONDITIONS. */ |
1937 | ||
1938 | static int | |
1939 | wants_debugger (list, conditions) | |
1940 | Lisp_Object list, conditions; | |
1941 | { | |
4de86b16 | 1942 | if (NILP (list)) |
128c0f66 RM |
1943 | return 0; |
1944 | if (! CONSP (list)) | |
1945 | return 1; | |
1946 | ||
ab67260b | 1947 | while (CONSP (conditions)) |
128c0f66 | 1948 | { |
ab67260b | 1949 | Lisp_Object this, tail; |
03699b14 KR |
1950 | this = XCAR (conditions); |
1951 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1952 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1953 | return 1; |
03699b14 | 1954 | conditions = XCDR (conditions); |
128c0f66 | 1955 | } |
ab67260b | 1956 | return 0; |
128c0f66 RM |
1957 | } |
1958 | ||
fc950e09 KH |
1959 | /* Return 1 if an error with condition-symbols CONDITIONS, |
1960 | and described by SIGNAL-DATA, should skip the debugger | |
1b1acc13 | 1961 | according to debugger-ignored-errors. */ |
fc950e09 KH |
1962 | |
1963 | static int | |
1964 | skip_debugger (conditions, data) | |
1965 | Lisp_Object conditions, data; | |
1966 | { | |
1967 | Lisp_Object tail; | |
1968 | int first_string = 1; | |
1969 | Lisp_Object error_message; | |
1970 | ||
17401c97 GM |
1971 | error_message = Qnil; |
1972 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1973 | { |
03699b14 | 1974 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1975 | { |
1976 | if (first_string) | |
1977 | { | |
1978 | error_message = Ferror_message_string (data); | |
1979 | first_string = 0; | |
1980 | } | |
177c0ea7 | 1981 | |
03699b14 | 1982 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1983 | return 1; |
1984 | } | |
1985 | else | |
1986 | { | |
1987 | Lisp_Object contail; | |
1988 | ||
17401c97 | 1989 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1990 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1991 | return 1; |
1992 | } | |
1993 | } | |
1994 | ||
1995 | return 0; | |
1996 | } | |
1997 | ||
ddaa36e1 AS |
1998 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
1999 | SIG and DATA describe the signal, as in find_handler_clause. */ | |
2000 | ||
2001 | static int | |
2002 | maybe_call_debugger (conditions, sig, data) | |
2003 | Lisp_Object conditions, sig, data; | |
2004 | { | |
2005 | Lisp_Object combined_data; | |
2006 | ||
2007 | combined_data = Fcons (sig, data); | |
2008 | ||
2009 | if ( | |
2010 | /* Don't try to run the debugger with interrupts blocked. | |
2011 | The editing loop would return anyway. */ | |
2012 | ! INPUT_BLOCKED_P | |
2013 | /* Does user want to enter debugger for this kind of error? */ | |
2014 | && (EQ (sig, Qquit) | |
2015 | ? debug_on_quit | |
2016 | : wants_debugger (Vdebug_on_error, conditions)) | |
2017 | && ! skip_debugger (conditions, combined_data) | |
2018 | /* rms: what's this for? */ | |
2019 | && when_entered_debugger < num_nonmacro_input_events) | |
2020 | { | |
2021 | call_debugger (Fcons (Qerror, Fcons (combined_data, Qnil))); | |
2022 | return 1; | |
2023 | } | |
2024 | ||
2025 | return 0; | |
2026 | } | |
2027 | ||
128c0f66 | 2028 | /* Value of Qlambda means we have called debugger and user has continued. |
1ea9dec4 | 2029 | There are two ways to pass SIG and DATA: |
9b942ebd | 2030 | = SIG is the error symbol, and DATA is the rest of the data. |
1ea9dec4 | 2031 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). |
9b942ebd | 2032 | This is for memory-full errors only. |
1ea9dec4 | 2033 | |
9f5903bb RS |
2034 | We need to increase max_specpdl_size temporarily around |
2035 | anything we do that can push on the specpdl, so as not to get | |
2036 | a second error here in case we're handling specpdl overflow. */ | |
db9f0278 JB |
2037 | |
2038 | static Lisp_Object | |
f01cbfdd | 2039 | find_handler_clause (handlers, conditions, sig, data) |
db9f0278 | 2040 | Lisp_Object handlers, conditions, sig, data; |
db9f0278 JB |
2041 | { |
2042 | register Lisp_Object h; | |
2043 | register Lisp_Object tem; | |
f01cbfdd RS |
2044 | int debugger_called = 0; |
2045 | int debugger_considered = 0; | |
db9f0278 | 2046 | |
f01cbfdd RS |
2047 | /* t is used by handlers for all conditions, set up by C code. */ |
2048 | if (EQ (handlers, Qt)) | |
db9f0278 | 2049 | return Qt; |
f01cbfdd RS |
2050 | |
2051 | /* Don't run the debugger for a memory-full error. | |
2052 | (There is no room in memory to do that!) */ | |
2053 | if (NILP (sig)) | |
2054 | debugger_considered = 1; | |
2055 | ||
61ede770 RS |
2056 | /* error is used similarly, but means print an error message |
2057 | and run the debugger if that is enabled. */ | |
2058 | if (EQ (handlers, Qerror) | |
57a6e758 RS |
2059 | || !NILP (Vdebug_on_signal)) /* This says call debugger even if |
2060 | there is a handler. */ | |
db9f0278 | 2061 | { |
f01cbfdd | 2062 | if (!NILP (sig) && wants_debugger (Vstack_trace_on_error, conditions)) |
88817f3b | 2063 | { |
48ce8ca7 | 2064 | max_lisp_eval_depth += 15; |
9f5903bb | 2065 | max_specpdl_size++; |
5b650faa SM |
2066 | if (noninteractive) |
2067 | Fbacktrace (); | |
2068 | else | |
2069 | internal_with_output_to_temp_buffer | |
2070 | ("*Backtrace*", | |
2071 | (Lisp_Object (*) (Lisp_Object)) Fbacktrace, | |
2072 | Qnil); | |
9f5903bb | 2073 | max_specpdl_size--; |
48ce8ca7 | 2074 | max_lisp_eval_depth -= 15; |
88817f3b | 2075 | } |
f01cbfdd RS |
2076 | |
2077 | if (!debugger_considered) | |
db9f0278 | 2078 | { |
f01cbfdd RS |
2079 | debugger_considered = 1; |
2080 | debugger_called = maybe_call_debugger (conditions, sig, data); | |
61ede770 | 2081 | } |
f01cbfdd | 2082 | |
61ede770 RS |
2083 | /* If there is no handler, return saying whether we ran the debugger. */ |
2084 | if (EQ (handlers, Qerror)) | |
2085 | { | |
2086 | if (debugger_called) | |
9f5903bb | 2087 | return Qlambda; |
61ede770 | 2088 | return Qt; |
db9f0278 | 2089 | } |
db9f0278 | 2090 | } |
f01cbfdd | 2091 | |
db9f0278 JB |
2092 | for (h = handlers; CONSP (h); h = Fcdr (h)) |
2093 | { | |
5f96776a RS |
2094 | Lisp_Object handler, condit; |
2095 | ||
2096 | handler = Fcar (h); | |
2097 | if (!CONSP (handler)) | |
db9f0278 | 2098 | continue; |
5f96776a RS |
2099 | condit = Fcar (handler); |
2100 | /* Handle a single condition name in handler HANDLER. */ | |
2101 | if (SYMBOLP (condit)) | |
2102 | { | |
2103 | tem = Fmemq (Fcar (handler), conditions); | |
2104 | if (!NILP (tem)) | |
2105 | return handler; | |
2106 | } | |
2107 | /* Handle a list of condition names in handler HANDLER. */ | |
2108 | else if (CONSP (condit)) | |
2109 | { | |
f01cbfdd RS |
2110 | Lisp_Object tail; |
2111 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 2112 | { |
f01cbfdd | 2113 | tem = Fmemq (Fcar (tail), conditions); |
5f96776a | 2114 | if (!NILP (tem)) |
f01cbfdd RS |
2115 | { |
2116 | /* This handler is going to apply. | |
2117 | Does it allow the debugger to run first? */ | |
2118 | if (! debugger_considered && !NILP (Fmemq (Qdebug, condit))) | |
2119 | maybe_call_debugger (conditions, sig, data); | |
2120 | return handler; | |
2121 | } | |
5f96776a RS |
2122 | } |
2123 | } | |
db9f0278 | 2124 | } |
f01cbfdd | 2125 | |
db9f0278 JB |
2126 | return Qnil; |
2127 | } | |
2128 | ||
2129 | /* dump an error message; called like printf */ | |
2130 | ||
2131 | /* VARARGS 1 */ | |
2132 | void | |
2133 | error (m, a1, a2, a3) | |
2134 | char *m; | |
9125da08 | 2135 | char *a1, *a2, *a3; |
db9f0278 JB |
2136 | { |
2137 | char buf[200]; | |
9125da08 RS |
2138 | int size = 200; |
2139 | int mlen; | |
2140 | char *buffer = buf; | |
2141 | char *args[3]; | |
2142 | int allocated = 0; | |
2143 | Lisp_Object string; | |
2144 | ||
2145 | args[0] = a1; | |
2146 | args[1] = a2; | |
2147 | args[2] = a3; | |
2148 | ||
2149 | mlen = strlen (m); | |
db9f0278 JB |
2150 | |
2151 | while (1) | |
9125da08 | 2152 | { |
955f3ff9 | 2153 | int used = doprnt (buffer, size, m, m + mlen, 3, args); |
9125da08 RS |
2154 | if (used < size) |
2155 | break; | |
2156 | size *= 2; | |
2157 | if (allocated) | |
2158 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
2159 | else |
2160 | { | |
2161 | buffer = (char *) xmalloc (size); | |
2162 | allocated = 1; | |
2163 | } | |
9125da08 RS |
2164 | } |
2165 | ||
955f3ff9 | 2166 | string = build_string (buffer); |
9125da08 | 2167 | if (allocated) |
9ae6734f | 2168 | xfree (buffer); |
9125da08 | 2169 | |
734d55a2 | 2170 | xsignal1 (Qerror, string); |
db9f0278 JB |
2171 | } |
2172 | \f | |
e72706be | 2173 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
2174 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
2175 | This means it contains a description for how to read arguments to give it. | |
2176 | The value is nil for an invalid function or a symbol with no function | |
2177 | definition. | |
2178 | ||
2179 | Interactively callable functions include strings and vectors (treated | |
2180 | as keyboard macros), lambda-expressions that contain a top-level call | |
2181 | to `interactive', autoload definitions made by `autoload' with non-nil | |
2182 | fourth argument, and some of the built-in functions of Lisp. | |
2183 | ||
e72706be RS |
2184 | Also, a symbol satisfies `commandp' if its function definition does so. |
2185 | ||
2186 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 2187 | then strings and vectors are not accepted. */) |
e72706be RS |
2188 | (function, for_call_interactively) |
2189 | Lisp_Object function, for_call_interactively; | |
db9f0278 JB |
2190 | { |
2191 | register Lisp_Object fun; | |
2192 | register Lisp_Object funcar; | |
52b71f49 | 2193 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
2194 | |
2195 | fun = function; | |
2196 | ||
52b71f49 SM |
2197 | fun = indirect_function (fun); /* Check cycles. */ |
2198 | if (NILP (fun) || EQ (fun, Qunbound)) | |
ffd56f97 | 2199 | return Qnil; |
db9f0278 | 2200 | |
52b71f49 SM |
2201 | /* Check an `interactive-form' property if present, analogous to the |
2202 | function-documentation property. */ | |
2203 | fun = function; | |
2204 | while (SYMBOLP (fun)) | |
2205 | { | |
2b9aa051 | 2206 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
2207 | if (!NILP (tmp)) |
2208 | if_prop = Qt; | |
2209 | fun = Fsymbol_function (fun); | |
2210 | } | |
2211 | ||
db9f0278 JB |
2212 | /* Emacs primitives are interactive if their DEFUN specifies an |
2213 | interactive spec. */ | |
90165123 | 2214 | if (SUBRP (fun)) |
04724b69 | 2215 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
2216 | |
2217 | /* Bytecode objects are interactive if they are long enough to | |
2218 | have an element whose index is COMPILED_INTERACTIVE, which is | |
2219 | where the interactive spec is stored. */ | |
90165123 | 2220 | else if (COMPILEDP (fun)) |
845975f5 | 2221 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 2222 | ? Qt : if_prop); |
db9f0278 JB |
2223 | |
2224 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 2225 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 2226 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
2227 | |
2228 | /* Lists may represent commands. */ | |
2229 | if (!CONSP (fun)) | |
2230 | return Qnil; | |
ed16fb98 | 2231 | funcar = XCAR (fun); |
db9f0278 | 2232 | if (EQ (funcar, Qlambda)) |
52b71f49 | 2233 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
db9f0278 | 2234 | if (EQ (funcar, Qautoload)) |
52b71f49 | 2235 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
2236 | else |
2237 | return Qnil; | |
2238 | } | |
2239 | ||
db9f0278 | 2240 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
2241 | doc: /* Define FUNCTION to autoload from FILE. |
2242 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
2243 | Third arg DOCSTRING is documentation for the function. | |
2244 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
2245 | Fifth arg TYPE indicates the type of the object: | |
2246 | nil or omitted says FUNCTION is a function, | |
2247 | `keymap' says FUNCTION is really a keymap, and | |
2248 | `macro' or t says FUNCTION is really a macro. | |
2249 | Third through fifth args give info about the real definition. | |
2250 | They default to nil. | |
2251 | If FUNCTION is already defined other than as an autoload, | |
2252 | this does nothing and returns nil. */) | |
2253 | (function, file, docstring, interactive, type) | |
ee9ee63c | 2254 | Lisp_Object function, file, docstring, interactive, type; |
db9f0278 | 2255 | { |
b7826503 PJ |
2256 | CHECK_SYMBOL (function); |
2257 | CHECK_STRING (file); | |
db9f0278 JB |
2258 | |
2259 | /* If function is defined and not as an autoload, don't override */ | |
2260 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 2261 | && !(CONSP (XSYMBOL (function)->function) |
03699b14 | 2262 | && EQ (XCAR (XSYMBOL (function)->function), Qautoload))) |
db9f0278 JB |
2263 | return Qnil; |
2264 | ||
7973e637 SM |
2265 | if (NILP (Vpurify_flag)) |
2266 | /* Only add entries after dumping, because the ones before are | |
2267 | not useful and else we get loads of them from the loaddefs.el. */ | |
2268 | LOADHIST_ATTACH (Fcons (Qautoload, function)); | |
905a9ed3 | 2269 | else |
a56eaaef | 2270 | /* We don't want the docstring in purespace (instead, |
d6d23852 SM |
2271 | Snarf-documentation should (hopefully) overwrite it). |
2272 | We used to use 0 here, but that leads to accidental sharing in | |
2273 | purecopy's hash-consing, so we use a (hopefully) unique integer | |
2274 | instead. */ | |
2275 | docstring = make_number (XHASH (function)); | |
a56eaaef DN |
2276 | return Ffset (function, |
2277 | Fpurecopy (list5 (Qautoload, file, docstring, | |
2278 | interactive, type))); | |
db9f0278 JB |
2279 | } |
2280 | ||
2281 | Lisp_Object | |
2282 | un_autoload (oldqueue) | |
2283 | Lisp_Object oldqueue; | |
2284 | { | |
2285 | register Lisp_Object queue, first, second; | |
2286 | ||
2287 | /* Queue to unwind is current value of Vautoload_queue. | |
2288 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
2289 | queue = Vautoload_queue; | |
2290 | Vautoload_queue = oldqueue; | |
2291 | while (CONSP (queue)) | |
2292 | { | |
e509f168 | 2293 | first = XCAR (queue); |
db9f0278 JB |
2294 | second = Fcdr (first); |
2295 | first = Fcar (first); | |
47b82df9 RS |
2296 | if (EQ (first, make_number (0))) |
2297 | Vfeatures = second; | |
db9f0278 JB |
2298 | else |
2299 | Ffset (first, second); | |
e509f168 | 2300 | queue = XCDR (queue); |
db9f0278 JB |
2301 | } |
2302 | return Qnil; | |
2303 | } | |
2304 | ||
ca20916b RS |
2305 | /* Load an autoloaded function. |
2306 | FUNNAME is the symbol which is the function's name. | |
2307 | FUNDEF is the autoload definition (a list). */ | |
2308 | ||
045ba794 | 2309 | void |
db9f0278 JB |
2310 | do_autoload (fundef, funname) |
2311 | Lisp_Object fundef, funname; | |
2312 | { | |
aed13378 | 2313 | int count = SPECPDL_INDEX (); |
d945992e | 2314 | Lisp_Object fun; |
ca20916b | 2315 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 2316 | |
aea6173f RS |
2317 | /* This is to make sure that loadup.el gives a clear picture |
2318 | of what files are preloaded and when. */ | |
ab4db096 RS |
2319 | if (! NILP (Vpurify_flag)) |
2320 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 2321 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 2322 | |
db9f0278 | 2323 | fun = funname; |
b7826503 | 2324 | CHECK_SYMBOL (funname); |
ca20916b | 2325 | GCPRO3 (fun, funname, fundef); |
db9f0278 | 2326 | |
f87740dc | 2327 | /* Preserve the match data. */ |
89f2614d | 2328 | record_unwind_save_match_data (); |
177c0ea7 | 2329 | |
a04ee161 RS |
2330 | /* If autoloading gets an error (which includes the error of failing |
2331 | to define the function being called), we use Vautoload_queue | |
2332 | to undo function definitions and `provide' calls made by | |
2333 | the function. We do this in the specific case of autoloading | |
2334 | because autoloading is not an explicit request "load this file", | |
2335 | but rather a request to "call this function". | |
2336 | ||
2337 | The value saved here is to be restored into Vautoload_queue. */ | |
db9f0278 JB |
2338 | record_unwind_protect (un_autoload, Vautoload_queue); |
2339 | Vautoload_queue = Qt; | |
7351b242 | 2340 | Fload (Fcar (Fcdr (fundef)), Qnil, Qt, Qnil, Qt); |
2a49b6e5 | 2341 | |
db9f0278 JB |
2342 | /* Once loading finishes, don't undo it. */ |
2343 | Vautoload_queue = Qt; | |
2344 | unbind_to (count, Qnil); | |
2345 | ||
a7f96a35 | 2346 | fun = Findirect_function (fun, Qnil); |
ffd56f97 | 2347 | |
76c2b0cc | 2348 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 | 2349 | error ("Autoloading failed to define function %s", |
d5db4077 | 2350 | SDATA (SYMBOL_NAME (funname))); |
ca20916b | 2351 | UNGCPRO; |
db9f0278 | 2352 | } |
4c576a83 | 2353 | |
db9f0278 JB |
2354 | \f |
2355 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
9dbc9081 PJ |
2356 | doc: /* Evaluate FORM and return its value. */) |
2357 | (form) | |
db9f0278 JB |
2358 | Lisp_Object form; |
2359 | { | |
2360 | Lisp_Object fun, val, original_fun, original_args; | |
2361 | Lisp_Object funcar; | |
2362 | struct backtrace backtrace; | |
2363 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2364 | ||
df470e3b | 2365 | if (handling_signal) |
48f8dfa3 | 2366 | abort (); |
177c0ea7 | 2367 | |
90165123 | 2368 | if (SYMBOLP (form)) |
b9598260 SM |
2369 | { |
2370 | /* If there's an active lexical environment, and the variable | |
2371 | isn't declared special, look up its binding in the lexical | |
2372 | environment. */ | |
2373 | if (!NILP (Vinternal_interpreter_environment) | |
2374 | && !XSYMBOL (form)->declared_special) | |
2375 | { | |
2376 | Lisp_Object lex_binding | |
2377 | = Fassq (form, Vinternal_interpreter_environment); | |
2378 | ||
2379 | /* If we found a lexical binding for FORM, return the value. | |
2380 | Otherwise, we just drop through and look for a dynamic | |
2381 | binding -- the variable isn't declared special, but there's | |
2382 | not much else we can do, and Fsymbol_value will take care | |
2383 | of signaling an error if there is no binding at all. */ | |
2384 | if (CONSP (lex_binding)) | |
2385 | return XCDR (lex_binding); | |
2386 | } | |
2387 | ||
2388 | return Fsymbol_value (form); | |
2389 | } | |
2390 | ||
db9f0278 JB |
2391 | if (!CONSP (form)) |
2392 | return form; | |
2393 | ||
2394 | QUIT; | |
ee830945 RS |
2395 | if ((consing_since_gc > gc_cons_threshold |
2396 | && consing_since_gc > gc_relative_threshold) | |
2397 | || | |
2398 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
db9f0278 JB |
2399 | { |
2400 | GCPRO1 (form); | |
2401 | Fgarbage_collect (); | |
2402 | UNGCPRO; | |
2403 | } | |
2404 | ||
2405 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2406 | { | |
2407 | if (max_lisp_eval_depth < 100) | |
2408 | max_lisp_eval_depth = 100; | |
2409 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2410 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2411 | } |
2412 | ||
2413 | original_fun = Fcar (form); | |
2414 | original_args = Fcdr (form); | |
2415 | ||
2416 | backtrace.next = backtrace_list; | |
2417 | backtrace_list = &backtrace; | |
2418 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
2419 | backtrace.args = &original_args; | |
2420 | backtrace.nargs = UNEVALLED; | |
2421 | backtrace.evalargs = 1; | |
2422 | backtrace.debug_on_exit = 0; | |
2423 | ||
2424 | if (debug_on_next_call) | |
2425 | do_debug_on_call (Qt); | |
2426 | ||
2427 | /* At this point, only original_fun and original_args | |
2428 | have values that will be used below */ | |
2429 | retry: | |
8788120f KS |
2430 | |
2431 | /* Optimize for no indirection. */ | |
2432 | fun = original_fun; | |
2433 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2434 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2435 | fun = indirect_function (fun); | |
db9f0278 | 2436 | |
90165123 | 2437 | if (SUBRP (fun)) |
db9f0278 JB |
2438 | { |
2439 | Lisp_Object numargs; | |
166c822d | 2440 | Lisp_Object argvals[8]; |
db9f0278 JB |
2441 | Lisp_Object args_left; |
2442 | register int i, maxargs; | |
2443 | ||
2444 | args_left = original_args; | |
2445 | numargs = Flength (args_left); | |
2446 | ||
c1788fbc RS |
2447 | CHECK_CONS_LIST (); |
2448 | ||
db9f0278 JB |
2449 | if (XINT (numargs) < XSUBR (fun)->min_args || |
2450 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2451 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 JB |
2452 | |
2453 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2454 | { | |
2455 | backtrace.evalargs = 0; | |
2456 | val = (*XSUBR (fun)->function) (args_left); | |
2457 | goto done; | |
2458 | } | |
2459 | ||
2460 | if (XSUBR (fun)->max_args == MANY) | |
2461 | { | |
2462 | /* Pass a vector of evaluated arguments */ | |
2463 | Lisp_Object *vals; | |
2464 | register int argnum = 0; | |
2465 | ||
2466 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
2467 | ||
2468 | GCPRO3 (args_left, fun, fun); | |
2469 | gcpro3.var = vals; | |
2470 | gcpro3.nvars = 0; | |
2471 | ||
265a9e55 | 2472 | while (!NILP (args_left)) |
db9f0278 JB |
2473 | { |
2474 | vals[argnum++] = Feval (Fcar (args_left)); | |
2475 | args_left = Fcdr (args_left); | |
2476 | gcpro3.nvars = argnum; | |
2477 | } | |
db9f0278 JB |
2478 | |
2479 | backtrace.args = vals; | |
2480 | backtrace.nargs = XINT (numargs); | |
2481 | ||
2482 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 2483 | UNGCPRO; |
db9f0278 JB |
2484 | goto done; |
2485 | } | |
2486 | ||
2487 | GCPRO3 (args_left, fun, fun); | |
2488 | gcpro3.var = argvals; | |
2489 | gcpro3.nvars = 0; | |
2490 | ||
2491 | maxargs = XSUBR (fun)->max_args; | |
2492 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2493 | { | |
2494 | argvals[i] = Feval (Fcar (args_left)); | |
2495 | gcpro3.nvars = ++i; | |
2496 | } | |
2497 | ||
2498 | UNGCPRO; | |
2499 | ||
2500 | backtrace.args = argvals; | |
2501 | backtrace.nargs = XINT (numargs); | |
2502 | ||
2503 | switch (i) | |
2504 | { | |
2505 | case 0: | |
2506 | val = (*XSUBR (fun)->function) (); | |
2507 | goto done; | |
2508 | case 1: | |
2509 | val = (*XSUBR (fun)->function) (argvals[0]); | |
2510 | goto done; | |
2511 | case 2: | |
2512 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
2513 | goto done; | |
2514 | case 3: | |
2515 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2516 | argvals[2]); | |
2517 | goto done; | |
2518 | case 4: | |
2519 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
2520 | argvals[2], argvals[3]); | |
2521 | goto done; | |
2522 | case 5: | |
2523 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2524 | argvals[3], argvals[4]); | |
2525 | goto done; | |
2526 | case 6: | |
2527 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2528 | argvals[3], argvals[4], argvals[5]); | |
2529 | goto done; | |
15c65264 RS |
2530 | case 7: |
2531 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2532 | argvals[3], argvals[4], argvals[5], | |
2533 | argvals[6]); | |
2534 | goto done; | |
db9f0278 | 2535 | |
166c822d KH |
2536 | case 8: |
2537 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
2538 | argvals[3], argvals[4], argvals[5], | |
2539 | argvals[6], argvals[7]); | |
2540 | goto done; | |
2541 | ||
db9f0278 | 2542 | default: |
08564963 JB |
2543 | /* Someone has created a subr that takes more arguments than |
2544 | is supported by this code. We need to either rewrite the | |
2545 | subr to use a different argument protocol, or add more | |
2546 | cases to this switch. */ | |
2547 | abort (); | |
db9f0278 JB |
2548 | } |
2549 | } | |
b9598260 SM |
2550 | if (FUNVECP (fun)) |
2551 | val = apply_lambda (fun, original_args, 1, Qnil); | |
db9f0278 JB |
2552 | else |
2553 | { | |
8788120f | 2554 | if (EQ (fun, Qunbound)) |
734d55a2 | 2555 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2556 | if (!CONSP (fun)) |
734d55a2 KS |
2557 | xsignal1 (Qinvalid_function, original_fun); |
2558 | funcar = XCAR (fun); | |
90165123 | 2559 | if (!SYMBOLP (funcar)) |
734d55a2 | 2560 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2561 | if (EQ (funcar, Qautoload)) |
2562 | { | |
2563 | do_autoload (fun, original_fun); | |
2564 | goto retry; | |
2565 | } | |
2566 | if (EQ (funcar, Qmacro)) | |
2567 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
2568 | else if (EQ (funcar, Qlambda)) | |
b9598260 SM |
2569 | val = apply_lambda (fun, original_args, 1, |
2570 | /* Only pass down the current lexical environment | |
2571 | if FUN is lexically embedded in FORM. */ | |
2572 | (CONSP (original_fun) | |
2573 | ? Vinternal_interpreter_environment | |
2574 | : Qnil)); | |
2575 | else if (EQ (funcar, Qclosure) | |
2576 | && CONSP (XCDR (fun)) | |
2577 | && CONSP (XCDR (XCDR (fun))) | |
2578 | && EQ (XCAR (XCDR (XCDR (fun))), Qlambda)) | |
2579 | val = apply_lambda (XCDR (XCDR (fun)), original_args, 1, | |
2580 | XCAR (XCDR (fun))); | |
db9f0278 | 2581 | else |
734d55a2 | 2582 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2583 | } |
2584 | done: | |
c1788fbc RS |
2585 | CHECK_CONS_LIST (); |
2586 | ||
db9f0278 JB |
2587 | lisp_eval_depth--; |
2588 | if (backtrace.debug_on_exit) | |
2589 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2590 | backtrace_list = backtrace.next; | |
824eb35e | 2591 | |
db9f0278 JB |
2592 | return val; |
2593 | } | |
2594 | \f | |
2595 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
9dbc9081 PJ |
2596 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2597 | Then return the value FUNCTION returns. | |
2598 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2599 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
2600 | (nargs, args) | |
db9f0278 JB |
2601 | int nargs; |
2602 | Lisp_Object *args; | |
2603 | { | |
2604 | register int i, numargs; | |
2605 | register Lisp_Object spread_arg; | |
2606 | register Lisp_Object *funcall_args; | |
db9f0278 | 2607 | Lisp_Object fun; |
96d44c64 | 2608 | struct gcpro gcpro1; |
db9f0278 JB |
2609 | |
2610 | fun = args [0]; | |
2611 | funcall_args = 0; | |
2612 | spread_arg = args [nargs - 1]; | |
b7826503 | 2613 | CHECK_LIST (spread_arg); |
177c0ea7 | 2614 | |
db9f0278 JB |
2615 | numargs = XINT (Flength (spread_arg)); |
2616 | ||
2617 | if (numargs == 0) | |
2618 | return Ffuncall (nargs - 1, args); | |
2619 | else if (numargs == 1) | |
2620 | { | |
03699b14 | 2621 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2622 | return Ffuncall (nargs, args); |
2623 | } | |
2624 | ||
a6e3fa71 | 2625 | numargs += nargs - 2; |
db9f0278 | 2626 | |
8788120f KS |
2627 | /* Optimize for no indirection. */ |
2628 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
2629 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
2630 | fun = indirect_function (fun); | |
ffd56f97 | 2631 | if (EQ (fun, Qunbound)) |
db9f0278 | 2632 | { |
ffd56f97 JB |
2633 | /* Let funcall get the error */ |
2634 | fun = args[0]; | |
2635 | goto funcall; | |
db9f0278 JB |
2636 | } |
2637 | ||
90165123 | 2638 | if (SUBRP (fun)) |
db9f0278 JB |
2639 | { |
2640 | if (numargs < XSUBR (fun)->min_args | |
2641 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2642 | goto funcall; /* Let funcall get the error */ | |
2643 | else if (XSUBR (fun)->max_args > numargs) | |
2644 | { | |
2645 | /* Avoid making funcall cons up a yet another new vector of arguments | |
2646 | by explicitly supplying nil's for optional values */ | |
2647 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
2648 | * sizeof (Lisp_Object)); | |
2649 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
2650 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2651 | GCPRO1 (*funcall_args); |
2652 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2653 | } |
2654 | } | |
2655 | funcall: | |
2656 | /* We add 1 to numargs because funcall_args includes the | |
2657 | function itself as well as its arguments. */ | |
2658 | if (!funcall_args) | |
a6e3fa71 JB |
2659 | { |
2660 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
2661 | * sizeof (Lisp_Object)); | |
96d44c64 SM |
2662 | GCPRO1 (*funcall_args); |
2663 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2664 | } |
2665 | ||
db9f0278 JB |
2666 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
2667 | /* Spread the last arg we got. Its first element goes in | |
2668 | the slot that it used to occupy, hence this value of I. */ | |
2669 | i = nargs - 1; | |
265a9e55 | 2670 | while (!NILP (spread_arg)) |
db9f0278 | 2671 | { |
03699b14 KR |
2672 | funcall_args [i++] = XCAR (spread_arg); |
2673 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2674 | } |
a6e3fa71 | 2675 | |
96d44c64 SM |
2676 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
2677 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
2678 | } |
2679 | \f | |
ff936e53 SM |
2680 | /* Run hook variables in various ways. */ |
2681 | ||
2682 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
2901f1d1 SM |
2683 | static Lisp_Object run_hook_with_args P_ ((int, Lisp_Object *, |
2684 | enum run_hooks_condition)); | |
ff936e53 | 2685 | |
8b5176cd | 2686 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2687 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2688 | Each argument should be a symbol, a hook variable. |
2689 | These symbols are processed in the order specified. | |
2690 | If a hook symbol has a non-nil value, that value may be a function | |
2691 | or a list of functions to be called to run the hook. | |
2692 | If the value is a function, it is called with no arguments. | |
2693 | If it is a list, the elements are called, in order, with no arguments. | |
2694 | ||
9f685258 LK |
2695 | Major modes should not use this function directly to run their mode |
2696 | hook; they should use `run-mode-hooks' instead. | |
2697 | ||
72e85d5d RS |
2698 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2699 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2700 | usage: (run-hooks &rest HOOKS) */) |
2701 | (nargs, args) | |
ff936e53 SM |
2702 | int nargs; |
2703 | Lisp_Object *args; | |
2704 | { | |
2705 | Lisp_Object hook[1]; | |
2706 | register int i; | |
2707 | ||
2708 | for (i = 0; i < nargs; i++) | |
2709 | { | |
2710 | hook[0] = args[i]; | |
2711 | run_hook_with_args (1, hook, to_completion); | |
2712 | } | |
2713 | ||
2714 | return Qnil; | |
2715 | } | |
177c0ea7 | 2716 | |
a0d76c27 | 2717 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2718 | Srun_hook_with_args, 1, MANY, 0, |
2719 | doc: /* Run HOOK with the specified arguments ARGS. | |
2720 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil | |
2721 | value, that value may be a function or a list of functions to be | |
2722 | called to run the hook. If the value is a function, it is called with | |
2723 | the given arguments and its return value is returned. If it is a list | |
2724 | of functions, those functions are called, in order, | |
2725 | with the given arguments ARGS. | |
d5e2c90c | 2726 | It is best not to depend on the value returned by `run-hook-with-args', |
9dbc9081 PJ |
2727 | as that may change. |
2728 | ||
72e85d5d RS |
2729 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2730 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2731 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
2732 | (nargs, args) | |
ff936e53 SM |
2733 | int nargs; |
2734 | Lisp_Object *args; | |
2735 | { | |
2736 | return run_hook_with_args (nargs, args, to_completion); | |
2737 | } | |
2738 | ||
a0d76c27 | 2739 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2740 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2741 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2742 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2743 | value, that value may be a function or a list of functions to be | |
2744 | called to run the hook. If the value is a function, it is called with | |
2745 | the given arguments and its return value is returned. | |
2746 | If it is a list of functions, those functions are called, in order, | |
2747 | with the given arguments ARGS, until one of them | |
9dbc9081 | 2748 | returns a non-nil value. Then we return that value. |
d5e2c90c | 2749 | However, if they all return nil, we return nil. |
9dbc9081 | 2750 | |
72e85d5d RS |
2751 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2752 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2753 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
2754 | (nargs, args) | |
b0b667cb KH |
2755 | int nargs; |
2756 | Lisp_Object *args; | |
2757 | { | |
ff936e53 SM |
2758 | return run_hook_with_args (nargs, args, until_success); |
2759 | } | |
2760 | ||
a0d76c27 | 2761 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2762 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2763 | doc: /* Run HOOK with the specified arguments ARGS. | |
d5e2c90c RS |
2764 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil |
2765 | value, that value may be a function or a list of functions to be | |
2766 | called to run the hook. If the value is a function, it is called with | |
2767 | the given arguments and its return value is returned. | |
2768 | If it is a list of functions, those functions are called, in order, | |
2769 | with the given arguments ARGS, until one of them returns nil. | |
2770 | Then we return nil. However, if they all return non-nil, we return non-nil. | |
9dbc9081 | 2771 | |
72e85d5d RS |
2772 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2773 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 PJ |
2774 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
2775 | (nargs, args) | |
ff936e53 SM |
2776 | int nargs; |
2777 | Lisp_Object *args; | |
2778 | { | |
2779 | return run_hook_with_args (nargs, args, until_failure); | |
2780 | } | |
2781 | ||
c933ea05 RS |
2782 | /* ARGS[0] should be a hook symbol. |
2783 | Call each of the functions in the hook value, passing each of them | |
2784 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
2785 | COND specifies a condition to test after each call | |
2786 | to decide whether to stop. | |
2787 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2788 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2789 | ||
2901f1d1 | 2790 | static Lisp_Object |
ff936e53 SM |
2791 | run_hook_with_args (nargs, args, cond) |
2792 | int nargs; | |
2793 | Lisp_Object *args; | |
2794 | enum run_hooks_condition cond; | |
2795 | { | |
2796 | Lisp_Object sym, val, ret; | |
fada05d6 | 2797 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2798 | |
f029ca5f RS |
2799 | /* If we are dying or still initializing, |
2800 | don't do anything--it would probably crash if we tried. */ | |
2801 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2802 | return Qnil; |
f029ca5f | 2803 | |
b0b667cb | 2804 | sym = args[0]; |
aa681b51 | 2805 | val = find_symbol_value (sym); |
ff936e53 SM |
2806 | ret = (cond == until_failure ? Qt : Qnil); |
2807 | ||
b0b667cb | 2808 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2809 | return ret; |
03699b14 | 2810 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2811 | { |
2812 | args[0] = val; | |
2813 | return Ffuncall (nargs, args); | |
2814 | } | |
2815 | else | |
2816 | { | |
8932b1c2 | 2817 | Lisp_Object globals = Qnil; |
fada05d6 | 2818 | GCPRO3 (sym, val, globals); |
cb9d21f8 | 2819 | |
ff936e53 SM |
2820 | for (; |
2821 | CONSP (val) && ((cond == to_completion) | |
2822 | || (cond == until_success ? NILP (ret) | |
2823 | : !NILP (ret))); | |
03699b14 | 2824 | val = XCDR (val)) |
b0b667cb | 2825 | { |
03699b14 | 2826 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2827 | { |
2828 | /* t indicates this hook has a local binding; | |
2829 | it means to run the global binding too. */ | |
8932b1c2 CY |
2830 | globals = Fdefault_value (sym); |
2831 | if (NILP (globals)) continue; | |
b0b667cb | 2832 | |
8932b1c2 | 2833 | if (!CONSP (globals) || EQ (XCAR (globals), Qlambda)) |
b0b667cb | 2834 | { |
8932b1c2 CY |
2835 | args[0] = globals; |
2836 | ret = Ffuncall (nargs, args); | |
2837 | } | |
2838 | else | |
2839 | { | |
2840 | for (; | |
2841 | CONSP (globals) && ((cond == to_completion) | |
2842 | || (cond == until_success ? NILP (ret) | |
2843 | : !NILP (ret))); | |
2844 | globals = XCDR (globals)) | |
2845 | { | |
2846 | args[0] = XCAR (globals); | |
2847 | /* In a global value, t should not occur. If it does, we | |
2848 | must ignore it to avoid an endless loop. */ | |
2849 | if (!EQ (args[0], Qt)) | |
2850 | ret = Ffuncall (nargs, args); | |
2851 | } | |
b0b667cb KH |
2852 | } |
2853 | } | |
2854 | else | |
2855 | { | |
03699b14 | 2856 | args[0] = XCAR (val); |
ff936e53 | 2857 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
2858 | } |
2859 | } | |
cb9d21f8 RS |
2860 | |
2861 | UNGCPRO; | |
ff936e53 | 2862 | return ret; |
b0b667cb KH |
2863 | } |
2864 | } | |
c933ea05 RS |
2865 | |
2866 | /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual | |
2867 | present value of that symbol. | |
2868 | Call each element of FUNLIST, | |
2869 | passing each of them the rest of ARGS. | |
2870 | The caller (or its caller, etc) must gcpro all of ARGS, | |
2871 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2872 | ||
2873 | Lisp_Object | |
2874 | run_hook_list_with_args (funlist, nargs, args) | |
2875 | Lisp_Object funlist; | |
2876 | int nargs; | |
2877 | Lisp_Object *args; | |
2878 | { | |
2879 | Lisp_Object sym; | |
2880 | Lisp_Object val; | |
fada05d6 KH |
2881 | Lisp_Object globals; |
2882 | struct gcpro gcpro1, gcpro2, gcpro3; | |
c933ea05 RS |
2883 | |
2884 | sym = args[0]; | |
fada05d6 KH |
2885 | globals = Qnil; |
2886 | GCPRO3 (sym, val, globals); | |
c933ea05 | 2887 | |
03699b14 | 2888 | for (val = funlist; CONSP (val); val = XCDR (val)) |
c933ea05 | 2889 | { |
03699b14 | 2890 | if (EQ (XCAR (val), Qt)) |
c933ea05 RS |
2891 | { |
2892 | /* t indicates this hook has a local binding; | |
2893 | it means to run the global binding too. */ | |
c933ea05 RS |
2894 | |
2895 | for (globals = Fdefault_value (sym); | |
2896 | CONSP (globals); | |
03699b14 | 2897 | globals = XCDR (globals)) |
c933ea05 | 2898 | { |
03699b14 | 2899 | args[0] = XCAR (globals); |
77d92e05 RS |
2900 | /* In a global value, t should not occur. If it does, we |
2901 | must ignore it to avoid an endless loop. */ | |
2902 | if (!EQ (args[0], Qt)) | |
2903 | Ffuncall (nargs, args); | |
c933ea05 RS |
2904 | } |
2905 | } | |
2906 | else | |
2907 | { | |
03699b14 | 2908 | args[0] = XCAR (val); |
c933ea05 RS |
2909 | Ffuncall (nargs, args); |
2910 | } | |
2911 | } | |
2912 | UNGCPRO; | |
2913 | return Qnil; | |
2914 | } | |
7d48558f RS |
2915 | |
2916 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ | |
2917 | ||
2918 | void | |
2919 | run_hook_with_args_2 (hook, arg1, arg2) | |
2920 | Lisp_Object hook, arg1, arg2; | |
2921 | { | |
2922 | Lisp_Object temp[3]; | |
2923 | temp[0] = hook; | |
2924 | temp[1] = arg1; | |
2925 | temp[2] = arg2; | |
2926 | ||
2927 | Frun_hook_with_args (3, temp); | |
2928 | } | |
ff936e53 | 2929 | \f |
db9f0278 JB |
2930 | /* Apply fn to arg */ |
2931 | Lisp_Object | |
2932 | apply1 (fn, arg) | |
2933 | Lisp_Object fn, arg; | |
2934 | { | |
a6e3fa71 JB |
2935 | struct gcpro gcpro1; |
2936 | ||
2937 | GCPRO1 (fn); | |
265a9e55 | 2938 | if (NILP (arg)) |
a6e3fa71 JB |
2939 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2940 | gcpro1.nvars = 2; | |
db9f0278 JB |
2941 | { |
2942 | Lisp_Object args[2]; | |
2943 | args[0] = fn; | |
2944 | args[1] = arg; | |
a6e3fa71 JB |
2945 | gcpro1.var = args; |
2946 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2947 | } |
db9f0278 JB |
2948 | } |
2949 | ||
2950 | /* Call function fn on no arguments */ | |
2951 | Lisp_Object | |
2952 | call0 (fn) | |
2953 | Lisp_Object fn; | |
2954 | { | |
a6e3fa71 JB |
2955 | struct gcpro gcpro1; |
2956 | ||
2957 | GCPRO1 (fn); | |
2958 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2959 | } |
2960 | ||
15285f9f | 2961 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2962 | /* ARGSUSED */ |
2963 | Lisp_Object | |
15285f9f RS |
2964 | call1 (fn, arg1) |
2965 | Lisp_Object fn, arg1; | |
db9f0278 | 2966 | { |
a6e3fa71 | 2967 | struct gcpro gcpro1; |
177c0ea7 | 2968 | Lisp_Object args[2]; |
a6e3fa71 | 2969 | |
db9f0278 | 2970 | args[0] = fn; |
15285f9f | 2971 | args[1] = arg1; |
a6e3fa71 JB |
2972 | GCPRO1 (args[0]); |
2973 | gcpro1.nvars = 2; | |
2974 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2975 | } |
2976 | ||
15285f9f | 2977 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2978 | /* ARGSUSED */ |
2979 | Lisp_Object | |
15285f9f RS |
2980 | call2 (fn, arg1, arg2) |
2981 | Lisp_Object fn, arg1, arg2; | |
db9f0278 | 2982 | { |
a6e3fa71 | 2983 | struct gcpro gcpro1; |
db9f0278 JB |
2984 | Lisp_Object args[3]; |
2985 | args[0] = fn; | |
15285f9f RS |
2986 | args[1] = arg1; |
2987 | args[2] = arg2; | |
a6e3fa71 JB |
2988 | GCPRO1 (args[0]); |
2989 | gcpro1.nvars = 3; | |
2990 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2991 | } |
2992 | ||
15285f9f | 2993 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2994 | /* ARGSUSED */ |
2995 | Lisp_Object | |
15285f9f RS |
2996 | call3 (fn, arg1, arg2, arg3) |
2997 | Lisp_Object fn, arg1, arg2, arg3; | |
db9f0278 | 2998 | { |
a6e3fa71 | 2999 | struct gcpro gcpro1; |
db9f0278 JB |
3000 | Lisp_Object args[4]; |
3001 | args[0] = fn; | |
15285f9f RS |
3002 | args[1] = arg1; |
3003 | args[2] = arg2; | |
3004 | args[3] = arg3; | |
a6e3fa71 JB |
3005 | GCPRO1 (args[0]); |
3006 | gcpro1.nvars = 4; | |
3007 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
3008 | } |
3009 | ||
15285f9f | 3010 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
3011 | /* ARGSUSED */ |
3012 | Lisp_Object | |
15285f9f RS |
3013 | call4 (fn, arg1, arg2, arg3, arg4) |
3014 | Lisp_Object fn, arg1, arg2, arg3, arg4; | |
a5a44b91 JB |
3015 | { |
3016 | struct gcpro gcpro1; | |
a5a44b91 JB |
3017 | Lisp_Object args[5]; |
3018 | args[0] = fn; | |
15285f9f RS |
3019 | args[1] = arg1; |
3020 | args[2] = arg2; | |
3021 | args[3] = arg3; | |
3022 | args[4] = arg4; | |
a5a44b91 JB |
3023 | GCPRO1 (args[0]); |
3024 | gcpro1.nvars = 5; | |
3025 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
3026 | } |
3027 | ||
15285f9f RS |
3028 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
3029 | /* ARGSUSED */ | |
3030 | Lisp_Object | |
3031 | call5 (fn, arg1, arg2, arg3, arg4, arg5) | |
3032 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5; | |
3033 | { | |
3034 | struct gcpro gcpro1; | |
15285f9f RS |
3035 | Lisp_Object args[6]; |
3036 | args[0] = fn; | |
3037 | args[1] = arg1; | |
3038 | args[2] = arg2; | |
3039 | args[3] = arg3; | |
3040 | args[4] = arg4; | |
3041 | args[5] = arg5; | |
3042 | GCPRO1 (args[0]); | |
3043 | gcpro1.nvars = 6; | |
3044 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
3045 | } |
3046 | ||
3047 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
3048 | /* ARGSUSED */ | |
3049 | Lisp_Object | |
3050 | call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6) | |
3051 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6; | |
3052 | { | |
3053 | struct gcpro gcpro1; | |
15285f9f RS |
3054 | Lisp_Object args[7]; |
3055 | args[0] = fn; | |
3056 | args[1] = arg1; | |
3057 | args[2] = arg2; | |
3058 | args[3] = arg3; | |
3059 | args[4] = arg4; | |
3060 | args[5] = arg5; | |
3061 | args[6] = arg6; | |
3062 | GCPRO1 (args[0]); | |
3063 | gcpro1.nvars = 7; | |
3064 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
3065 | } |
3066 | ||
574c05e2 KK |
3067 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7 */ |
3068 | /* ARGSUSED */ | |
3069 | Lisp_Object | |
3070 | call7 (fn, arg1, arg2, arg3, arg4, arg5, arg6, arg7) | |
3071 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6, arg7; | |
3072 | { | |
3073 | struct gcpro gcpro1; | |
574c05e2 KK |
3074 | Lisp_Object args[8]; |
3075 | args[0] = fn; | |
3076 | args[1] = arg1; | |
3077 | args[2] = arg2; | |
3078 | args[3] = arg3; | |
3079 | args[4] = arg4; | |
3080 | args[5] = arg5; | |
3081 | args[6] = arg6; | |
3082 | args[7] = arg7; | |
3083 | GCPRO1 (args[0]); | |
3084 | gcpro1.nvars = 8; | |
3085 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
3086 | } |
3087 | ||
6c2ef893 RS |
3088 | /* The caller should GCPRO all the elements of ARGS. */ |
3089 | ||
b9598260 SM |
3090 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
3091 | doc: /* Return non-nil if OBJECT is a type of object that can be called as a function. */) | |
3092 | (object) | |
3093 | Lisp_Object object; | |
3094 | { | |
3095 | if (SYMBOLP (object) && !NILP (Ffboundp (object))) | |
3096 | { | |
3097 | object = Findirect_function (object, Qnil); | |
3098 | ||
3099 | if (CONSP (object) && EQ (XCAR (object), Qautoload)) | |
3100 | { | |
3101 | /* Autoloaded symbols are functions, except if they load | |
3102 | macros or keymaps. */ | |
3103 | int i; | |
3104 | for (i = 0; i < 4 && CONSP (object); i++) | |
3105 | object = XCDR (object); | |
3106 | ||
3107 | return (CONSP (object) && !NILP (XCAR (object))) ? Qnil : Qt; | |
3108 | } | |
3109 | } | |
3110 | ||
3111 | if (SUBRP (object)) | |
3112 | return (XSUBR (object)->max_args != Qunevalled) ? Qt : Qnil; | |
3113 | else if (FUNVECP (object)) | |
3114 | return Qt; | |
3115 | else if (CONSP (object)) | |
3116 | { | |
3117 | Lisp_Object car = XCAR (object); | |
3118 | return (EQ (car, Qlambda) || EQ (car, Qclosure)) ? Qt : Qnil; | |
3119 | } | |
3120 | else | |
3121 | return Qnil; | |
3122 | } | |
3123 | ||
db9f0278 | 3124 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
3125 | doc: /* Call first argument as a function, passing remaining arguments to it. |
3126 | Return the value that function returns. | |
3127 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
3128 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
3129 | (nargs, args) | |
db9f0278 JB |
3130 | int nargs; |
3131 | Lisp_Object *args; | |
3132 | { | |
8788120f | 3133 | Lisp_Object fun, original_fun; |
db9f0278 JB |
3134 | Lisp_Object funcar; |
3135 | int numargs = nargs - 1; | |
3136 | Lisp_Object lisp_numargs; | |
3137 | Lisp_Object val; | |
3138 | struct backtrace backtrace; | |
3139 | register Lisp_Object *internal_args; | |
3140 | register int i; | |
3141 | ||
3142 | QUIT; | |
ee830945 RS |
3143 | if ((consing_since_gc > gc_cons_threshold |
3144 | && consing_since_gc > gc_relative_threshold) | |
3145 | || | |
3146 | (!NILP (Vmemory_full) && consing_since_gc > memory_full_cons_threshold)) | |
a6e3fa71 | 3147 | Fgarbage_collect (); |
db9f0278 JB |
3148 | |
3149 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
3150 | { | |
3151 | if (max_lisp_eval_depth < 100) | |
3152 | max_lisp_eval_depth = 100; | |
3153 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 3154 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
3155 | } |
3156 | ||
3157 | backtrace.next = backtrace_list; | |
3158 | backtrace_list = &backtrace; | |
3159 | backtrace.function = &args[0]; | |
3160 | backtrace.args = &args[1]; | |
3161 | backtrace.nargs = nargs - 1; | |
3162 | backtrace.evalargs = 0; | |
3163 | backtrace.debug_on_exit = 0; | |
3164 | ||
3165 | if (debug_on_next_call) | |
3166 | do_debug_on_call (Qlambda); | |
3167 | ||
fff3ff9c KS |
3168 | CHECK_CONS_LIST (); |
3169 | ||
8788120f KS |
3170 | original_fun = args[0]; |
3171 | ||
db9f0278 JB |
3172 | retry: |
3173 | ||
8788120f KS |
3174 | /* Optimize for no indirection. */ |
3175 | fun = original_fun; | |
3176 | if (SYMBOLP (fun) && !EQ (fun, Qunbound) | |
3177 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) | |
3178 | fun = indirect_function (fun); | |
db9f0278 | 3179 | |
90165123 | 3180 | if (SUBRP (fun)) |
db9f0278 | 3181 | { |
fff3ff9c | 3182 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
3183 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
3184 | { | |
a631e24c | 3185 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 3186 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
3187 | } |
3188 | ||
3189 | if (XSUBR (fun)->max_args == UNEVALLED) | |
734d55a2 | 3190 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3191 | |
3192 | if (XSUBR (fun)->max_args == MANY) | |
3193 | { | |
3194 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
3195 | goto done; | |
3196 | } | |
3197 | ||
3198 | if (XSUBR (fun)->max_args > numargs) | |
3199 | { | |
3200 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
3201 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
3202 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
3203 | internal_args[i] = Qnil; | |
3204 | } | |
3205 | else | |
3206 | internal_args = args + 1; | |
3207 | switch (XSUBR (fun)->max_args) | |
3208 | { | |
3209 | case 0: | |
3210 | val = (*XSUBR (fun)->function) (); | |
3211 | goto done; | |
3212 | case 1: | |
3213 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
3214 | goto done; | |
3215 | case 2: | |
82fc29a1 | 3216 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1]); |
db9f0278 JB |
3217 | goto done; |
3218 | case 3: | |
3219 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3220 | internal_args[2]); | |
3221 | goto done; | |
3222 | case 4: | |
3223 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
82fc29a1 | 3224 | internal_args[2], internal_args[3]); |
db9f0278 JB |
3225 | goto done; |
3226 | case 5: | |
3227 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3228 | internal_args[2], internal_args[3], | |
3229 | internal_args[4]); | |
3230 | goto done; | |
3231 | case 6: | |
3232 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3233 | internal_args[2], internal_args[3], | |
3234 | internal_args[4], internal_args[5]); | |
3235 | goto done; | |
15c65264 RS |
3236 | case 7: |
3237 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3238 | internal_args[2], internal_args[3], | |
3239 | internal_args[4], internal_args[5], | |
3240 | internal_args[6]); | |
3241 | goto done; | |
db9f0278 | 3242 | |
166c822d KH |
3243 | case 8: |
3244 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
3245 | internal_args[2], internal_args[3], | |
3246 | internal_args[4], internal_args[5], | |
3247 | internal_args[6], internal_args[7]); | |
3248 | goto done; | |
3249 | ||
db9f0278 | 3250 | default: |
70ee42f7 | 3251 | |
166c822d | 3252 | /* If a subr takes more than 8 arguments without using MANY |
177c0ea7 | 3253 | or UNEVALLED, we need to extend this function to support it. |
70ee42f7 JB |
3254 | Until this is done, there is no way to call the function. */ |
3255 | abort (); | |
db9f0278 JB |
3256 | } |
3257 | } | |
b9598260 SM |
3258 | |
3259 | if (FUNVECP (fun)) | |
3260 | val = funcall_lambda (fun, numargs, args + 1, Qnil); | |
db9f0278 JB |
3261 | else |
3262 | { | |
8788120f | 3263 | if (EQ (fun, Qunbound)) |
734d55a2 | 3264 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 3265 | if (!CONSP (fun)) |
734d55a2 KS |
3266 | xsignal1 (Qinvalid_function, original_fun); |
3267 | funcar = XCAR (fun); | |
90165123 | 3268 | if (!SYMBOLP (funcar)) |
734d55a2 | 3269 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 3270 | if (EQ (funcar, Qlambda)) |
b9598260 SM |
3271 | val = funcall_lambda (fun, numargs, args + 1, Qnil); |
3272 | else if (EQ (funcar, Qclosure) | |
3273 | && CONSP (XCDR (fun)) | |
3274 | && CONSP (XCDR (XCDR (fun))) | |
3275 | && EQ (XCAR (XCDR (XCDR (fun))), Qlambda)) | |
3276 | val = funcall_lambda (XCDR (XCDR (fun)), numargs, args + 1, | |
3277 | XCAR (XCDR (fun))); | |
db9f0278 JB |
3278 | else if (EQ (funcar, Qautoload)) |
3279 | { | |
8788120f | 3280 | do_autoload (fun, original_fun); |
fff3ff9c | 3281 | CHECK_CONS_LIST (); |
db9f0278 JB |
3282 | goto retry; |
3283 | } | |
3284 | else | |
734d55a2 | 3285 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
3286 | } |
3287 | done: | |
c1788fbc | 3288 | CHECK_CONS_LIST (); |
db9f0278 JB |
3289 | lisp_eval_depth--; |
3290 | if (backtrace.debug_on_exit) | |
3291 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
3292 | backtrace_list = backtrace.next; | |
3293 | return val; | |
3294 | } | |
3295 | \f | |
3296 | Lisp_Object | |
b9598260 | 3297 | apply_lambda (fun, args, eval_flag, lexenv) |
db9f0278 JB |
3298 | Lisp_Object fun, args; |
3299 | int eval_flag; | |
b9598260 | 3300 | Lisp_Object lexenv; |
db9f0278 JB |
3301 | { |
3302 | Lisp_Object args_left; | |
3303 | Lisp_Object numargs; | |
3304 | register Lisp_Object *arg_vector; | |
3305 | struct gcpro gcpro1, gcpro2, gcpro3; | |
3306 | register int i; | |
3307 | register Lisp_Object tem; | |
3308 | ||
3309 | numargs = Flength (args); | |
3310 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
3311 | args_left = args; | |
3312 | ||
3313 | GCPRO3 (*arg_vector, args_left, fun); | |
3314 | gcpro1.nvars = 0; | |
3315 | ||
3316 | for (i = 0; i < XINT (numargs);) | |
3317 | { | |
3318 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
3319 | if (eval_flag) tem = Feval (tem); | |
3320 | arg_vector[i++] = tem; | |
3321 | gcpro1.nvars = i; | |
3322 | } | |
3323 | ||
3324 | UNGCPRO; | |
3325 | ||
3326 | if (eval_flag) | |
3327 | { | |
3328 | backtrace_list->args = arg_vector; | |
3329 | backtrace_list->nargs = i; | |
3330 | } | |
3331 | backtrace_list->evalargs = 0; | |
b9598260 | 3332 | tem = funcall_lambda (fun, XINT (numargs), arg_vector, lexenv); |
db9f0278 JB |
3333 | |
3334 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
3335 | if (backtrace_list->debug_on_exit) | |
3336 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
3337 | /* Don't do it again when we return to eval. */ | |
3338 | backtrace_list->debug_on_exit = 0; | |
3339 | return tem; | |
3340 | } | |
3341 | ||
b9598260 SM |
3342 | |
3343 | /* Call a non-bytecode funvec object FUN, on the argments in ARGS (of | |
3344 | length NARGS). */ | |
3345 | ||
3346 | static Lisp_Object | |
3347 | funcall_funvec (fun, nargs, args) | |
3348 | Lisp_Object fun; | |
3349 | int nargs; | |
3350 | Lisp_Object *args; | |
3351 | { | |
3352 | int size = FUNVEC_SIZE (fun); | |
3353 | Lisp_Object tag = (size > 0 ? AREF (fun, 0) : Qnil); | |
3354 | ||
3355 | if (EQ (tag, Qcurry)) | |
3356 | { | |
3357 | /* A curried function is a way to attach arguments to a another | |
3358 | function. The first element of the vector is the identifier | |
3359 | `curry', the second is the wrapped function, and remaining | |
3360 | elements are the attached arguments. */ | |
3361 | int num_curried_args = size - 2; | |
3362 | /* Offset of the curried and user args in the final arglist. Curried | |
3363 | args are first in the new arg vector, after the function. User | |
3364 | args follow. */ | |
3365 | int curried_args_offs = 1; | |
3366 | int user_args_offs = curried_args_offs + num_curried_args; | |
3367 | /* The curried function and arguments. */ | |
3368 | Lisp_Object *curry_params = XVECTOR (fun)->contents + 1; | |
3369 | /* The arguments in the curry vector. */ | |
3370 | Lisp_Object *curried_args = curry_params + 1; | |
3371 | /* The number of arguments with which we'll call funcall, and the | |
3372 | arguments themselves. */ | |
3373 | int num_funcall_args = 1 + num_curried_args + nargs; | |
3374 | Lisp_Object *funcall_args | |
3375 | = (Lisp_Object *) alloca (num_funcall_args * sizeof (Lisp_Object)); | |
3376 | ||
3377 | /* First comes the real function. */ | |
3378 | funcall_args[0] = curry_params[0]; | |
3379 | ||
3380 | /* Then the arguments in the appropriate order. */ | |
3381 | bcopy (curried_args, funcall_args + curried_args_offs, | |
3382 | num_curried_args * sizeof (Lisp_Object)); | |
3383 | bcopy (args, funcall_args + user_args_offs, | |
3384 | nargs * sizeof (Lisp_Object)); | |
3385 | ||
3386 | return Ffuncall (num_funcall_args, funcall_args); | |
3387 | } | |
3388 | else | |
3389 | xsignal1 (Qinvalid_function, fun); | |
3390 | } | |
3391 | ||
3392 | ||
db9f0278 JB |
3393 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR |
3394 | and return the result of evaluation. | |
3395 | FUN must be either a lambda-expression or a compiled-code object. */ | |
3396 | ||
2901f1d1 | 3397 | static Lisp_Object |
b9598260 | 3398 | funcall_lambda (fun, nargs, arg_vector, lexenv) |
db9f0278 JB |
3399 | Lisp_Object fun; |
3400 | int nargs; | |
3401 | register Lisp_Object *arg_vector; | |
b9598260 | 3402 | Lisp_Object lexenv; |
db9f0278 | 3403 | { |
9ab90667 | 3404 | Lisp_Object val, syms_left, next; |
aed13378 | 3405 | int count = SPECPDL_INDEX (); |
9ab90667 | 3406 | int i, optional, rest; |
db9f0278 | 3407 | |
b9598260 SM |
3408 | if (COMPILEDP (fun) |
3409 | && FUNVEC_SIZE (fun) > COMPILED_PUSH_ARGS | |
3410 | && ! NILP (XVECTOR (fun)->contents[COMPILED_PUSH_ARGS])) | |
3411 | /* A byte-code object with a non-nil `push args' slot means we | |
3412 | shouldn't bind any arguments, instead just call the byte-code | |
3413 | interpreter directly; it will push arguments as necessary. | |
3414 | ||
3415 | Byte-code objects with either a non-existant, or a nil value for | |
3416 | the `push args' slot (the default), have dynamically-bound | |
3417 | arguments, and use the argument-binding code below instead (as do | |
3418 | all interpreted functions, even lexically bound ones). */ | |
3419 | { | |
3420 | /* If we have not actually read the bytecode string | |
3421 | and constants vector yet, fetch them from the file. */ | |
3422 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
3423 | Ffetch_bytecode (fun); | |
3424 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
3425 | AREF (fun, COMPILED_CONSTANTS), | |
3426 | AREF (fun, COMPILED_STACK_DEPTH), | |
3427 | AREF (fun, COMPILED_ARGLIST), | |
3428 | nargs, arg_vector); | |
3429 | } | |
3430 | ||
3431 | if (FUNVECP (fun) && !FUNVEC_COMPILED_P (fun)) | |
3432 | /* Byte-compiled functions are handled directly below, but we | |
3433 | call other funvec types via funcall_funvec. */ | |
3434 | return funcall_funvec (fun, nargs, arg_vector); | |
3435 | ||
90165123 | 3436 | if (CONSP (fun)) |
9ab90667 GM |
3437 | { |
3438 | syms_left = XCDR (fun); | |
3439 | if (CONSP (syms_left)) | |
3440 | syms_left = XCAR (syms_left); | |
3441 | else | |
734d55a2 | 3442 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3443 | } |
90165123 | 3444 | else if (COMPILEDP (fun)) |
845975f5 | 3445 | syms_left = AREF (fun, COMPILED_ARGLIST); |
9ab90667 GM |
3446 | else |
3447 | abort (); | |
db9f0278 | 3448 | |
9ab90667 GM |
3449 | i = optional = rest = 0; |
3450 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3451 | { |
3452 | QUIT; | |
177c0ea7 | 3453 | |
9ab90667 | 3454 | next = XCAR (syms_left); |
8788120f | 3455 | if (!SYMBOLP (next)) |
734d55a2 | 3456 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3457 | |
db9f0278 JB |
3458 | if (EQ (next, Qand_rest)) |
3459 | rest = 1; | |
3460 | else if (EQ (next, Qand_optional)) | |
3461 | optional = 1; | |
3462 | else if (rest) | |
3463 | { | |
9ffa21d4 | 3464 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
3465 | i = nargs; |
3466 | } | |
db9f0278 | 3467 | else |
b9598260 SM |
3468 | { |
3469 | Lisp_Object val; | |
3470 | ||
3471 | /* Get the argument's actual value. */ | |
3472 | if (i < nargs) | |
3473 | val = arg_vector[i++]; | |
3474 | else if (!optional) | |
3475 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3476 | else | |
3477 | val = Qnil; | |
3478 | ||
3479 | /* Bind the argument. */ | |
3480 | if (!NILP (lexenv) | |
3481 | && SYMBOLP (next) && !XSYMBOL (next)->declared_special) | |
3482 | /* Lexically bind NEXT by adding it to the lexenv alist. */ | |
3483 | lexenv = Fcons (Fcons (next, val), lexenv); | |
3484 | else | |
3485 | /* Dynamically bind NEXT. */ | |
3486 | specbind (next, val); | |
3487 | } | |
db9f0278 JB |
3488 | } |
3489 | ||
9ab90667 | 3490 | if (!NILP (syms_left)) |
734d55a2 | 3491 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3492 | else if (i < nargs) |
734d55a2 | 3493 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3494 | |
b9598260 SM |
3495 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3496 | /* Instantiate a new lexical environment. */ | |
3497 | specbind (Qinternal_interpreter_environment, lexenv); | |
3498 | ||
90165123 | 3499 | if (CONSP (fun)) |
9ab90667 | 3500 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3501 | else |
ca248607 RS |
3502 | { |
3503 | /* If we have not actually read the bytecode string | |
3504 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3505 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3506 | Ffetch_bytecode (fun); |
b9598260 SM |
3507 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3508 | AREF (fun, COMPILED_CONSTANTS), | |
3509 | AREF (fun, COMPILED_STACK_DEPTH), | |
3510 | Qnil, 0, 0); | |
ca248607 | 3511 | } |
177c0ea7 | 3512 | |
db9f0278 JB |
3513 | return unbind_to (count, val); |
3514 | } | |
661c7d6e KH |
3515 | |
3516 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3517 | 1, 1, 0, |
3518 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
3519 | (object) | |
661c7d6e KH |
3520 | Lisp_Object object; |
3521 | { | |
3522 | Lisp_Object tem; | |
3523 | ||
845975f5 | 3524 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3525 | { |
845975f5 | 3526 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3527 | if (!CONSP (tem)) |
845975f5 SM |
3528 | { |
3529 | tem = AREF (object, COMPILED_BYTECODE); | |
3530 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3531 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3532 | else |
3533 | error ("Invalid byte code"); | |
3534 | } | |
3ae565b3 SM |
3535 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3536 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3537 | } |
3538 | return object; | |
3539 | } | |
db9f0278 JB |
3540 | \f |
3541 | void | |
3542 | grow_specpdl () | |
3543 | { | |
aed13378 | 3544 | register int count = SPECPDL_INDEX (); |
db9f0278 JB |
3545 | if (specpdl_size >= max_specpdl_size) |
3546 | { | |
3547 | if (max_specpdl_size < 400) | |
3548 | max_specpdl_size = 400; | |
3549 | if (specpdl_size >= max_specpdl_size) | |
734d55a2 | 3550 | signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil); |
db9f0278 JB |
3551 | } |
3552 | specpdl_size *= 2; | |
3553 | if (specpdl_size > max_specpdl_size) | |
3554 | specpdl_size = max_specpdl_size; | |
3555 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
3556 | specpdl_ptr = specpdl + count; | |
3557 | } | |
3558 | ||
4e2db1fe SM |
3559 | /* specpdl_ptr->symbol is a field which describes which variable is |
3560 | let-bound, so it can be properly undone when we unbind_to. | |
3561 | It can have the following two shapes: | |
3562 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3563 | a symbol that is not buffer-local (at least at the time | |
3564 | the let binding started). Note also that it should not be | |
3565 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3566 | to record V2 here). | |
3567 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3568 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3569 | which buffer is affected (or nil if the let-binding affects the | |
3570 | global value of the variable) and BUFFER tells us which buffer was | |
3571 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3572 | BUFFER did not yet have a buffer-local value). */ | |
3573 | ||
db9f0278 JB |
3574 | void |
3575 | specbind (symbol, value) | |
3576 | Lisp_Object symbol, value; | |
3577 | { | |
ce5b453a SM |
3578 | struct Lisp_Symbol *sym; |
3579 | ||
3580 | eassert (!handling_signal); | |
db9f0278 | 3581 | |
b7826503 | 3582 | CHECK_SYMBOL (symbol); |
ce5b453a | 3583 | sym = XSYMBOL (symbol); |
db9f0278 JB |
3584 | if (specpdl_ptr == specpdl + specpdl_size) |
3585 | grow_specpdl (); | |
719177b3 | 3586 | |
ce5b453a SM |
3587 | start: |
3588 | switch (sym->redirect) | |
719177b3 | 3589 | { |
ce5b453a SM |
3590 | case SYMBOL_VARALIAS: |
3591 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3592 | case SYMBOL_PLAINVAL: | |
3593 | { /* The most common case is that of a non-constant symbol with a | |
3594 | trivial value. Make that as fast as we can. */ | |
3595 | specpdl_ptr->symbol = symbol; | |
3596 | specpdl_ptr->old_value = SYMBOL_VAL (sym); | |
3597 | specpdl_ptr->func = NULL; | |
3598 | ++specpdl_ptr; | |
3599 | if (!sym->constant) | |
3600 | SET_SYMBOL_VAL (sym, value); | |
eb700b82 | 3601 | else |
94b612ad | 3602 | set_internal (symbol, value, Qnil, 1); |
ce5b453a | 3603 | break; |
9ab90667 | 3604 | } |
4e2db1fe SM |
3605 | case SYMBOL_LOCALIZED: |
3606 | if (SYMBOL_BLV (sym)->frame_local) | |
3607 | error ("Frame-local vars cannot be let-bound"); | |
3608 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3609 | { |
3610 | Lisp_Object ovalue = find_symbol_value (symbol); | |
3611 | specpdl_ptr->func = 0; | |
3612 | specpdl_ptr->old_value = ovalue; | |
3613 | ||
3614 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3615 | || (EQ (SYMBOL_BLV (sym)->where, | |
3616 | SYMBOL_BLV (sym)->frame_local ? | |
3617 | Fselected_frame () : Fcurrent_buffer ()))); | |
3618 | ||
3619 | if (sym->redirect == SYMBOL_LOCALIZED | |
3620 | || BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
3621 | { | |
3622 | Lisp_Object where, cur_buf = Fcurrent_buffer (); | |
3623 | ||
3624 | /* For a local variable, record both the symbol and which | |
3625 | buffer's or frame's value we are saving. */ | |
3626 | if (!NILP (Flocal_variable_p (symbol, Qnil))) | |
3627 | { | |
3628 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
3629 | || (BLV_FOUND (SYMBOL_BLV (sym)) | |
3630 | && EQ (cur_buf, SYMBOL_BLV (sym)->where))); | |
3631 | where = cur_buf; | |
3632 | } | |
3633 | else if (sym->redirect == SYMBOL_LOCALIZED | |
3634 | && BLV_FOUND (SYMBOL_BLV (sym))) | |
3635 | where = SYMBOL_BLV (sym)->where; | |
3636 | else | |
3637 | where = Qnil; | |
3638 | ||
3639 | /* We're not using the `unused' slot in the specbinding | |
3640 | structure because this would mean we have to do more | |
3641 | work for simple variables. */ | |
3642 | /* FIXME: The third value `current_buffer' is only used in | |
3643 | let_shadows_buffer_binding_p which is itself only used | |
3644 | in set_internal for local_if_set. */ | |
4e2db1fe | 3645 | eassert (NILP (where) || EQ (where, cur_buf)); |
ce5b453a SM |
3646 | specpdl_ptr->symbol = Fcons (symbol, Fcons (where, cur_buf)); |
3647 | ||
3648 | /* If SYMBOL is a per-buffer variable which doesn't have a | |
3649 | buffer-local value here, make the `let' change the global | |
3650 | value by changing the value of SYMBOL in all buffers not | |
3651 | having their own value. This is consistent with what | |
3652 | happens with other buffer-local variables. */ | |
3653 | if (NILP (where) | |
3654 | && sym->redirect == SYMBOL_FORWARDED) | |
3655 | { | |
3656 | eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym))); | |
3657 | ++specpdl_ptr; | |
3658 | Fset_default (symbol, value); | |
3659 | return; | |
3660 | } | |
3661 | } | |
3662 | else | |
3663 | specpdl_ptr->symbol = symbol; | |
3664 | ||
3665 | specpdl_ptr++; | |
94b612ad | 3666 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3667 | break; |
3668 | } | |
3669 | default: abort (); | |
9ab90667 | 3670 | } |
db9f0278 JB |
3671 | } |
3672 | ||
3673 | void | |
3674 | record_unwind_protect (function, arg) | |
1d159538 | 3675 | Lisp_Object (*function) P_ ((Lisp_Object)); |
db9f0278 JB |
3676 | Lisp_Object arg; |
3677 | { | |
9ba8e10d CY |
3678 | eassert (!handling_signal); |
3679 | ||
db9f0278 JB |
3680 | if (specpdl_ptr == specpdl + specpdl_size) |
3681 | grow_specpdl (); | |
3682 | specpdl_ptr->func = function; | |
3683 | specpdl_ptr->symbol = Qnil; | |
3684 | specpdl_ptr->old_value = arg; | |
3685 | specpdl_ptr++; | |
3686 | } | |
3687 | ||
3688 | Lisp_Object | |
3689 | unbind_to (count, value) | |
3690 | int count; | |
3691 | Lisp_Object value; | |
3692 | { | |
5a073f50 KS |
3693 | Lisp_Object quitf = Vquit_flag; |
3694 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3695 | |
5a073f50 | 3696 | GCPRO2 (value, quitf); |
db9f0278 JB |
3697 | Vquit_flag = Qnil; |
3698 | ||
3699 | while (specpdl_ptr != specpdl + count) | |
3700 | { | |
611a8f8c RS |
3701 | /* Copy the binding, and decrement specpdl_ptr, before we do |
3702 | the work to unbind it. We decrement first | |
3703 | so that an error in unbinding won't try to unbind | |
3704 | the same entry again, and we copy the binding first | |
3705 | in case more bindings are made during some of the code we run. */ | |
eb700b82 | 3706 | |
45f266dc DL |
3707 | struct specbinding this_binding; |
3708 | this_binding = *--specpdl_ptr; | |
611a8f8c RS |
3709 | |
3710 | if (this_binding.func != 0) | |
3711 | (*this_binding.func) (this_binding.old_value); | |
0967b4b0 GM |
3712 | /* If the symbol is a list, it is really (SYMBOL WHERE |
3713 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3714 | frame. If WHERE is a buffer or frame, this indicates we | |
1b1acc13 PJ |
3715 | bound a variable that had a buffer-local or frame-local |
3716 | binding. WHERE nil means that the variable had the default | |
0967b4b0 GM |
3717 | value when it was bound. CURRENT-BUFFER is the buffer that |
3718 | was current when the variable was bound. */ | |
611a8f8c | 3719 | else if (CONSP (this_binding.symbol)) |
719177b3 | 3720 | { |
eb700b82 | 3721 | Lisp_Object symbol, where; |
719177b3 | 3722 | |
611a8f8c RS |
3723 | symbol = XCAR (this_binding.symbol); |
3724 | where = XCAR (XCDR (this_binding.symbol)); | |
719177b3 | 3725 | |
eb700b82 | 3726 | if (NILP (where)) |
611a8f8c | 3727 | Fset_default (symbol, this_binding.old_value); |
94b612ad SM |
3728 | /* If `where' is non-nil, reset the value in the appropriate |
3729 | local binding, but only if that binding still exists. */ | |
4e2db1fe SM |
3730 | else if (BUFFERP (where) |
3731 | ? !NILP (Flocal_variable_p (symbol, where)) | |
3732 | : !NILP (Fassq (symbol, XFRAME (where)->param_alist))) | |
3733 | set_internal (symbol, this_binding.old_value, where, 1); | |
719177b3 | 3734 | } |
94b612ad SM |
3735 | /* If variable has a trivial value (no forwarding), we can |
3736 | just set it. No need to check for constant symbols here, | |
3737 | since that was already done by specbind. */ | |
3738 | else if (XSYMBOL (this_binding.symbol)->redirect == SYMBOL_PLAINVAL) | |
3739 | SET_SYMBOL_VAL (XSYMBOL (this_binding.symbol), | |
3740 | this_binding.old_value); | |
db9f0278 | 3741 | else |
94b612ad SM |
3742 | /* NOTE: we only ever come here if make_local_foo was used for |
3743 | the first time on this var within this let. */ | |
3744 | Fset_default (this_binding.symbol, this_binding.old_value); | |
db9f0278 | 3745 | } |
177c0ea7 | 3746 | |
5a073f50 KS |
3747 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3748 | Vquit_flag = quitf; | |
db9f0278 JB |
3749 | |
3750 | UNGCPRO; | |
db9f0278 JB |
3751 | return value; |
3752 | } | |
b9598260 | 3753 | |
db9f0278 | 3754 | \f |
b9598260 SM |
3755 | |
3756 | DEFUN ("specialp", Fspecialp, Sspecialp, 1, 1, 0, | |
3757 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. | |
3758 | A special variable is one that will be bound dynamically, even in a | |
3759 | context where binding is lexical by default. */) | |
3760 | (symbol) | |
3761 | Lisp_Object symbol; | |
3762 | { | |
3763 | CHECK_SYMBOL (symbol); | |
3764 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3765 | } | |
3766 | ||
3767 | \f | |
3768 | ||
3769 | DEFUN ("curry", Fcurry, Scurry, 1, MANY, 0, | |
3770 | doc: /* Return FUN curried with ARGS. | |
3771 | The result is a function-like object that will append any arguments it | |
3772 | is called with to ARGS, and call FUN with the resulting list of arguments. | |
3773 | ||
3774 | For instance: | |
3775 | (funcall (curry '+ 3 4 5) 2) is the same as (funcall '+ 3 4 5 2) | |
3776 | and: | |
3777 | (mapcar (curry 'concat "The ") '("a" "b" "c")) | |
3778 | => ("The a" "The b" "The c") | |
3779 | ||
3780 | usage: (curry FUN &rest ARGS) */) | |
3781 | (nargs, args) | |
3782 | register int nargs; | |
3783 | Lisp_Object *args; | |
3784 | { | |
3785 | return make_funvec (Qcurry, 0, nargs, args); | |
3786 | } | |
3787 | \f | |
3788 | ||
db9f0278 | 3789 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3790 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3791 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
3792 | (level, flag) | |
db9f0278 JB |
3793 | Lisp_Object level, flag; |
3794 | { | |
3795 | register struct backtrace *backlist = backtrace_list; | |
3796 | register int i; | |
3797 | ||
b7826503 | 3798 | CHECK_NUMBER (level); |
db9f0278 JB |
3799 | |
3800 | for (i = 0; backlist && i < XINT (level); i++) | |
3801 | { | |
3802 | backlist = backlist->next; | |
3803 | } | |
3804 | ||
3805 | if (backlist) | |
265a9e55 | 3806 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
3807 | |
3808 | return flag; | |
3809 | } | |
3810 | ||
3811 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3812 | doc: /* Print a trace of Lisp function calls currently active. |
3813 | Output stream used is value of `standard-output'. */) | |
3814 | () | |
db9f0278 JB |
3815 | { |
3816 | register struct backtrace *backlist = backtrace_list; | |
3817 | register int i; | |
3818 | Lisp_Object tail; | |
3819 | Lisp_Object tem; | |
3820 | extern Lisp_Object Vprint_level; | |
3821 | struct gcpro gcpro1; | |
3822 | ||
a631e24c | 3823 | XSETFASTINT (Vprint_level, 3); |
db9f0278 JB |
3824 | |
3825 | tail = Qnil; | |
3826 | GCPRO1 (tail); | |
3827 | ||
3828 | while (backlist) | |
3829 | { | |
3830 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
3831 | if (backlist->nargs == UNEVALLED) | |
3832 | { | |
3833 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 3834 | write_string ("\n", -1); |
db9f0278 JB |
3835 | } |
3836 | else | |
3837 | { | |
3838 | tem = *backlist->function; | |
3839 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
3840 | write_string ("(", -1); | |
3841 | if (backlist->nargs == MANY) | |
3842 | { | |
3843 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 3844 | !NILP (tail); |
db9f0278 JB |
3845 | tail = Fcdr (tail), i++) |
3846 | { | |
3847 | if (i) write_string (" ", -1); | |
3848 | Fprin1 (Fcar (tail), Qnil); | |
3849 | } | |
3850 | } | |
3851 | else | |
3852 | { | |
3853 | for (i = 0; i < backlist->nargs; i++) | |
3854 | { | |
3855 | if (i) write_string (" ", -1); | |
3856 | Fprin1 (backlist->args[i], Qnil); | |
3857 | } | |
3858 | } | |
b6703b02 | 3859 | write_string (")\n", -1); |
db9f0278 | 3860 | } |
db9f0278 JB |
3861 | backlist = backlist->next; |
3862 | } | |
3863 | ||
3864 | Vprint_level = Qnil; | |
3865 | UNGCPRO; | |
3866 | return Qnil; | |
3867 | } | |
3868 | ||
17401c97 | 3869 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3870 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3871 | If that frame has not evaluated the arguments yet (or is a special form), | |
3872 | the value is (nil FUNCTION ARG-FORMS...). | |
3873 | If that frame has evaluated its arguments and called its function already, | |
3874 | the value is (t FUNCTION ARG-VALUES...). | |
3875 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3876 | FUNCTION is whatever was supplied as car of evaluated list, | |
3877 | or a lambda expression for macro calls. | |
3878 | If NFRAMES is more than the number of frames, the value is nil. */) | |
3879 | (nframes) | |
db9f0278 JB |
3880 | Lisp_Object nframes; |
3881 | { | |
3882 | register struct backtrace *backlist = backtrace_list; | |
3883 | register int i; | |
3884 | Lisp_Object tem; | |
3885 | ||
b7826503 | 3886 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3887 | |
3888 | /* Find the frame requested. */ | |
b6703b02 | 3889 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
3890 | backlist = backlist->next; |
3891 | ||
3892 | if (!backlist) | |
3893 | return Qnil; | |
3894 | if (backlist->nargs == UNEVALLED) | |
3895 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
3896 | else | |
3897 | { | |
3898 | if (backlist->nargs == MANY) | |
3899 | tem = *backlist->args; | |
3900 | else | |
3901 | tem = Flist (backlist->nargs, backlist->args); | |
3902 | ||
3903 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
3904 | } | |
3905 | } | |
a2ff3819 | 3906 | |
db9f0278 | 3907 | \f |
4ce0541e SM |
3908 | void |
3909 | mark_backtrace () | |
3910 | { | |
3911 | register struct backtrace *backlist; | |
3912 | register int i; | |
3913 | ||
3914 | for (backlist = backtrace_list; backlist; backlist = backlist->next) | |
3915 | { | |
3916 | mark_object (*backlist->function); | |
3917 | ||
3918 | if (backlist->nargs == UNEVALLED || backlist->nargs == MANY) | |
3919 | i = 0; | |
3920 | else | |
3921 | i = backlist->nargs - 1; | |
3922 | for (; i >= 0; i--) | |
3923 | mark_object (backlist->args[i]); | |
3924 | } | |
3925 | } | |
3926 | ||
dfcf069d | 3927 | void |
db9f0278 JB |
3928 | syms_of_eval () |
3929 | { | |
3930 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
82fc29a1 | 3931 | doc: /* *Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3932 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3933 | an error is signaled. |
3934 | You can safely use a value considerably larger than the default value, | |
3935 | if that proves inconveniently small. However, if you increase it too far, | |
3936 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 JB |
3937 | |
3938 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
9dbc9081 | 3939 | doc: /* *Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3940 | |
3941 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3942 | actual stack overflow in C, which would be fatal for Emacs. |
3943 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3944 | if that proves inconveniently small. However, if you increase it too far, |
3945 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 JB |
3946 | |
3947 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
9dbc9081 | 3948 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3949 | If the value is t, that means do an ordinary quit. |
3950 | If the value equals `throw-on-input', that means quit by throwing | |
3951 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3952 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3953 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3954 | Vquit_flag = Qnil; |
3955 | ||
3956 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
9dbc9081 PJ |
3957 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3958 | Note that `quit-flag' will still be set by typing C-g, | |
3959 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3960 | To prevent this happening, set `quit-flag' to nil | |
3961 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3962 | Vinhibit_quit = Qnil; |
3963 | ||
d67b4f80 | 3964 | Qinhibit_quit = intern_c_string ("inhibit-quit"); |
ad236261 JB |
3965 | staticpro (&Qinhibit_quit); |
3966 | ||
d67b4f80 | 3967 | Qautoload = intern_c_string ("autoload"); |
db9f0278 JB |
3968 | staticpro (&Qautoload); |
3969 | ||
d67b4f80 | 3970 | Qdebug_on_error = intern_c_string ("debug-on-error"); |
db9f0278 JB |
3971 | staticpro (&Qdebug_on_error); |
3972 | ||
d67b4f80 | 3973 | Qmacro = intern_c_string ("macro"); |
db9f0278 JB |
3974 | staticpro (&Qmacro); |
3975 | ||
d67b4f80 | 3976 | Qdeclare = intern_c_string ("declare"); |
d6edd563 | 3977 | staticpro (&Qdeclare); |
177c0ea7 | 3978 | |
db9f0278 JB |
3979 | /* Note that the process handling also uses Qexit, but we don't want |
3980 | to staticpro it twice, so we just do it here. */ | |
d67b4f80 | 3981 | Qexit = intern_c_string ("exit"); |
db9f0278 JB |
3982 | staticpro (&Qexit); |
3983 | ||
d67b4f80 | 3984 | Qinteractive = intern_c_string ("interactive"); |
db9f0278 JB |
3985 | staticpro (&Qinteractive); |
3986 | ||
d67b4f80 | 3987 | Qcommandp = intern_c_string ("commandp"); |
db9f0278 JB |
3988 | staticpro (&Qcommandp); |
3989 | ||
d67b4f80 | 3990 | Qdefun = intern_c_string ("defun"); |
db9f0278 JB |
3991 | staticpro (&Qdefun); |
3992 | ||
d67b4f80 | 3993 | Qand_rest = intern_c_string ("&rest"); |
db9f0278 JB |
3994 | staticpro (&Qand_rest); |
3995 | ||
d67b4f80 | 3996 | Qand_optional = intern_c_string ("&optional"); |
db9f0278 JB |
3997 | staticpro (&Qand_optional); |
3998 | ||
b9598260 SM |
3999 | Qclosure = intern_c_string ("closure"); |
4000 | staticpro (&Qclosure); | |
4001 | ||
4002 | Qcurry = intern_c_string ("curry"); | |
4003 | staticpro (&Qcurry); | |
4004 | ||
4005 | Qunevalled = intern_c_string ("unevalled"); | |
4006 | staticpro (&Qunevalled); | |
4007 | ||
d67b4f80 | 4008 | Qdebug = intern_c_string ("debug"); |
f01cbfdd RS |
4009 | staticpro (&Qdebug); |
4010 | ||
128c0f66 | 4011 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
704788b3 RS |
4012 | doc: /* *Non-nil means errors display a backtrace buffer. |
4013 | More precisely, this happens for any error that is handled | |
4014 | by the editor command loop. | |
9dbc9081 PJ |
4015 | If the value is a list, an error only means to display a backtrace |
4016 | if one of its condition symbols appears in the list. */); | |
128c0f66 | 4017 | Vstack_trace_on_error = Qnil; |
db9f0278 | 4018 | |
128c0f66 | 4019 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
9dbc9081 PJ |
4020 | doc: /* *Non-nil means enter debugger if an error is signaled. |
4021 | Does not apply to errors handled by `condition-case' or those | |
4022 | matched by `debug-ignored-errors'. | |
4023 | If the value is a list, an error only means to enter the debugger | |
4024 | if one of its condition symbols appears in the list. | |
4025 | When you evaluate an expression interactively, this variable | |
4026 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f CY |
4027 | The command `toggle-debug-on-error' toggles this. |
4028 | See also the variable `debug-on-quit'. */); | |
128c0f66 | 4029 | Vdebug_on_error = Qnil; |
db9f0278 | 4030 | |
fc950e09 | 4031 | DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors, |
9dbc9081 PJ |
4032 | doc: /* *List of errors for which the debugger should not be called. |
4033 | Each element may be a condition-name or a regexp that matches error messages. | |
4034 | If any element applies to a given error, that error skips the debugger | |
4035 | and just returns to top level. | |
4036 | This overrides the variable `debug-on-error'. | |
4037 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
4038 | Vdebug_ignored_errors = Qnil; |
4039 | ||
db9f0278 | 4040 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, |
82fc29a1 JB |
4041 | doc: /* *Non-nil means enter debugger if quit is signaled (C-g, for example). |
4042 | Does not apply if quit is handled by a `condition-case'. */); | |
db9f0278 JB |
4043 | debug_on_quit = 0; |
4044 | ||
4045 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
9dbc9081 | 4046 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 4047 | |
556d7314 | 4048 | DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue, |
9dbc9081 PJ |
4049 | doc: /* Non-nil means debugger may continue execution. |
4050 | This is nil when the debugger is called under circumstances where it | |
4051 | might not be safe to continue. */); | |
dac204bc | 4052 | debugger_may_continue = 1; |
556d7314 | 4053 | |
db9f0278 | 4054 | DEFVAR_LISP ("debugger", &Vdebugger, |
9dbc9081 PJ |
4055 | doc: /* Function to call to invoke debugger. |
4056 | If due to frame exit, args are `exit' and the value being returned; | |
4057 | this function's value will be returned instead of that. | |
4058 | If due to error, args are `error' and a list of the args to `signal'. | |
4059 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
4060 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
4061 | Vdebugger = Qnil; |
4062 | ||
61ede770 | 4063 | DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function, |
9dbc9081 PJ |
4064 | doc: /* If non-nil, this is a function for `signal' to call. |
4065 | It receives the same arguments that `signal' was given. | |
4066 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
4067 | Vsignal_hook_function = Qnil; |
4068 | ||
57a6e758 | 4069 | DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal, |
9dbc9081 PJ |
4070 | doc: /* *Non-nil means call the debugger regardless of condition handlers. |
4071 | Note that `debug-on-error', `debug-on-quit' and friends | |
4072 | still determine whether to handle the particular condition. */); | |
57a6e758 | 4073 | Vdebug_on_signal = Qnil; |
61ede770 | 4074 | |
d6edd563 GM |
4075 | DEFVAR_LISP ("macro-declaration-function", &Vmacro_declaration_function, |
4076 | doc: /* Function to process declarations in a macro definition. | |
4077 | The function will be called with two args MACRO and DECL. | |
4078 | MACRO is the name of the macro being defined. | |
4079 | DECL is a list `(declare ...)' containing the declarations. | |
4080 | The value the function returns is not used. */); | |
4081 | Vmacro_declaration_function = Qnil; | |
4082 | ||
b9598260 SM |
4083 | Qinternal_interpreter_environment |
4084 | = intern_c_string ("internal-interpreter-environment"); | |
4085 | staticpro (&Qinternal_interpreter_environment); | |
4086 | DEFVAR_LISP ("internal-interpreter-environment", | |
4087 | &Vinternal_interpreter_environment, | |
4088 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. | |
4089 | When lexical binding is not being used, this variable is nil. | |
4090 | A value of `(t)' indicates an empty environment, otherwise it is an | |
4091 | alist of active lexical bindings. */); | |
4092 | Vinternal_interpreter_environment = Qnil; | |
4093 | ||
d67b4f80 | 4094 | Vrun_hooks = intern_c_string ("run-hooks"); |
6e6e9f08 | 4095 | staticpro (&Vrun_hooks); |
db9f0278 JB |
4096 | |
4097 | staticpro (&Vautoload_queue); | |
4098 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
4099 | staticpro (&Vsignaling_function); |
4100 | Vsignaling_function = Qnil; | |
db9f0278 JB |
4101 | |
4102 | defsubr (&Sor); | |
4103 | defsubr (&Sand); | |
4104 | defsubr (&Sif); | |
4105 | defsubr (&Scond); | |
4106 | defsubr (&Sprogn); | |
4107 | defsubr (&Sprog1); | |
4108 | defsubr (&Sprog2); | |
4109 | defsubr (&Ssetq); | |
4110 | defsubr (&Squote); | |
4111 | defsubr (&Sfunction); | |
4112 | defsubr (&Sdefun); | |
4113 | defsubr (&Sdefmacro); | |
4114 | defsubr (&Sdefvar); | |
19cebf5a | 4115 | defsubr (&Sdefvaralias); |
db9f0278 JB |
4116 | defsubr (&Sdefconst); |
4117 | defsubr (&Suser_variable_p); | |
4118 | defsubr (&Slet); | |
4119 | defsubr (&SletX); | |
4120 | defsubr (&Swhile); | |
4121 | defsubr (&Smacroexpand); | |
4122 | defsubr (&Scatch); | |
4123 | defsubr (&Sthrow); | |
4124 | defsubr (&Sunwind_protect); | |
4125 | defsubr (&Scondition_case); | |
4126 | defsubr (&Ssignal); | |
4127 | defsubr (&Sinteractive_p); | |
4b664e76 | 4128 | defsubr (&Scalled_interactively_p); |
db9f0278 JB |
4129 | defsubr (&Scommandp); |
4130 | defsubr (&Sautoload); | |
4131 | defsubr (&Seval); | |
4132 | defsubr (&Sapply); | |
4133 | defsubr (&Sfuncall); | |
ff936e53 SM |
4134 | defsubr (&Srun_hooks); |
4135 | defsubr (&Srun_hook_with_args); | |
4136 | defsubr (&Srun_hook_with_args_until_success); | |
4137 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 4138 | defsubr (&Sfetch_bytecode); |
b9598260 | 4139 | defsubr (&Scurry); |
db9f0278 JB |
4140 | defsubr (&Sbacktrace_debug); |
4141 | defsubr (&Sbacktrace); | |
4142 | defsubr (&Sbacktrace_frame); | |
b9598260 SM |
4143 | defsubr (&Scurry); |
4144 | defsubr (&Sspecialp); | |
4145 | defsubr (&Sfunctionp); | |
db9f0278 | 4146 | } |
ab5796a9 MB |
4147 | |
4148 | /* arch-tag: 014a07aa-33ab-4a8f-a3d2-ee8a4a9ff7fb | |
4149 | (do not change this comment) */ |