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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
ab422c4d PE |
2 | Copyright (C) 1985-1987, 1993-1995, 1999-2013 Free Software |
3 | Foundation, Inc. | |
db9f0278 JB |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
9ec0b715 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
db9f0278 | 8 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
db9f0278 JB |
11 | |
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
db9f0278 JB |
19 | |
20 | ||
18160b98 | 21 | #include <config.h> |
eb3f1cc8 | 22 | #include <limits.h> |
4e2fe2e6 | 23 | #include <stdio.h> |
db9f0278 | 24 | #include "lisp.h" |
9ac0d9e0 | 25 | #include "blockinput.h" |
db9f0278 | 26 | #include "commands.h" |
1f98fa48 | 27 | #include "keyboard.h" |
3648c842 | 28 | #include "dispextern.h" |
94b612ad | 29 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 30 | |
b70e1a2b SM |
31 | #if HAVE_X_WINDOWS |
32 | #include "xterm.h" | |
33 | #endif | |
34 | ||
244ed907 PE |
35 | #if !BYTE_MARK_STACK |
36 | static | |
37 | #endif | |
db9f0278 JB |
38 | struct catchtag *catchlist; |
39 | ||
244ed907 PE |
40 | /* Chain of condition handlers currently in effect. |
41 | The elements of this chain are contained in the stack frames | |
42 | of Fcondition_case and internal_condition_case. | |
43 | When an error is signaled (by calling Fsignal, below), | |
44 | this chain is searched for an element that applies. */ | |
45 | ||
46 | #if !BYTE_MARK_STACK | |
47 | static | |
48 | #endif | |
49 | struct handler *handlerlist; | |
50 | ||
15934ffa RS |
51 | #ifdef DEBUG_GCPRO |
52 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
53 | int gcpro_level; | |
54 | #endif | |
55 | ||
61b108cc | 56 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp; |
29208e82 | 57 | Lisp_Object Qinhibit_quit; |
955cbe7b PE |
58 | Lisp_Object Qand_rest; |
59 | static Lisp_Object Qand_optional; | |
45b82ad0 | 60 | static Lisp_Object Qinhibit_debugger; |
955cbe7b | 61 | static Lisp_Object Qdeclare; |
b9598260 SM |
62 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
63 | ||
ed008a6d | 64 | static Lisp_Object Qdebug; |
db9f0278 | 65 | |
6e6e9f08 RS |
66 | /* This holds either the symbol `run-hooks' or nil. |
67 | It is nil at an early stage of startup, and when Emacs | |
68 | is shutting down. */ | |
4c576a83 | 69 | |
db9f0278 JB |
70 | Lisp_Object Vrun_hooks; |
71 | ||
72 | /* Non-nil means record all fset's and provide's, to be undone | |
73 | if the file being autoloaded is not fully loaded. | |
74 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 75 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
76 | |
77 | Lisp_Object Vautoload_queue; | |
78 | ||
9349e5f7 PE |
79 | /* Current number of specbindings allocated in specpdl, not counting |
80 | the dummy entry specpdl[-1]. */ | |
4c576a83 | 81 | |
d311d28c | 82 | ptrdiff_t specpdl_size; |
db9f0278 | 83 | |
9349e5f7 PE |
84 | /* Pointer to beginning of specpdl. A dummy entry specpdl[-1] exists |
85 | only so that its address can be taken. */ | |
4c576a83 | 86 | |
9349e5f7 | 87 | union specbinding *specpdl; |
db9f0278 JB |
88 | |
89 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 90 | |
9349e5f7 | 91 | union specbinding *specpdl_ptr; |
db9f0278 | 92 | |
db9f0278 | 93 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 94 | |
57a96f5c | 95 | static EMACS_INT lisp_eval_depth; |
db9f0278 | 96 | |
be857679 | 97 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 98 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 99 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
100 | know that the debugger itself has an error, and we should just |
101 | signal the error instead of entering an infinite loop of debugger | |
102 | invocations. */ | |
4c576a83 | 103 | |
d311d28c | 104 | static EMACS_INT when_entered_debugger; |
db9f0278 | 105 | |
a2ff3819 GM |
106 | /* The function from which the last `signal' was called. Set in |
107 | Fsignal. */ | |
2f592f95 | 108 | /* FIXME: We should probably get rid of this! */ |
a2ff3819 GM |
109 | Lisp_Object Vsignaling_function; |
110 | ||
d1f55f16 CY |
111 | /* If non-nil, Lisp code must not be run since some part of Emacs is |
112 | in an inconsistent state. Currently, x-create-frame uses this to | |
113 | avoid triggering window-configuration-change-hook while the new | |
114 | frame is half-initialized. */ | |
115 | Lisp_Object inhibit_lisp_code; | |
116 | ||
9c203066 PE |
117 | /* These would ordinarily be static, but they need to be visible to GDB. */ |
118 | bool backtrace_p (union specbinding *) EXTERNALLY_VISIBLE; | |
119 | Lisp_Object *backtrace_args (union specbinding *) EXTERNALLY_VISIBLE; | |
120 | Lisp_Object backtrace_function (union specbinding *) EXTERNALLY_VISIBLE; | |
121 | union specbinding *backtrace_next (union specbinding *) EXTERNALLY_VISIBLE; | |
122 | union specbinding *backtrace_top (void) EXTERNALLY_VISIBLE; | |
123 | ||
f66c7cf8 | 124 | static Lisp_Object funcall_lambda (Lisp_Object, ptrdiff_t, Lisp_Object *); |
7200d79c | 125 | static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args); |
e46f2325 | 126 | |
84575e67 | 127 | static Lisp_Object |
9349e5f7 | 128 | specpdl_symbol (union specbinding *pdl) |
84575e67 PE |
129 | { |
130 | eassert (pdl->kind >= SPECPDL_LET); | |
9349e5f7 | 131 | return pdl->let.symbol; |
84575e67 PE |
132 | } |
133 | ||
134 | static Lisp_Object | |
9349e5f7 | 135 | specpdl_old_value (union specbinding *pdl) |
84575e67 PE |
136 | { |
137 | eassert (pdl->kind >= SPECPDL_LET); | |
9349e5f7 | 138 | return pdl->let.old_value; |
84575e67 PE |
139 | } |
140 | ||
141 | static Lisp_Object | |
9349e5f7 | 142 | specpdl_where (union specbinding *pdl) |
84575e67 PE |
143 | { |
144 | eassert (pdl->kind > SPECPDL_LET); | |
9349e5f7 | 145 | return pdl->let.where; |
84575e67 PE |
146 | } |
147 | ||
148 | static Lisp_Object | |
9349e5f7 | 149 | specpdl_arg (union specbinding *pdl) |
84575e67 PE |
150 | { |
151 | eassert (pdl->kind == SPECPDL_UNWIND); | |
9349e5f7 | 152 | return pdl->unwind.arg; |
84575e67 PE |
153 | } |
154 | ||
9c203066 | 155 | Lisp_Object |
9349e5f7 | 156 | backtrace_function (union specbinding *pdl) |
84575e67 PE |
157 | { |
158 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 159 | return pdl->bt.function; |
84575e67 PE |
160 | } |
161 | ||
162 | static ptrdiff_t | |
9349e5f7 | 163 | backtrace_nargs (union specbinding *pdl) |
84575e67 PE |
164 | { |
165 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 166 | return pdl->bt.nargs; |
84575e67 PE |
167 | } |
168 | ||
9c203066 | 169 | Lisp_Object * |
9349e5f7 | 170 | backtrace_args (union specbinding *pdl) |
84575e67 PE |
171 | { |
172 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 173 | return pdl->bt.args; |
84575e67 PE |
174 | } |
175 | ||
176 | static bool | |
9349e5f7 | 177 | backtrace_debug_on_exit (union specbinding *pdl) |
84575e67 PE |
178 | { |
179 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 180 | return pdl->bt.debug_on_exit; |
84575e67 PE |
181 | } |
182 | ||
2f592f95 | 183 | /* Functions to modify slots of backtrace records. */ |
e46f2325 | 184 | |
3d5ee10a | 185 | static void |
9349e5f7 PE |
186 | set_backtrace_args (union specbinding *pdl, Lisp_Object *args) |
187 | { | |
188 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
189 | pdl->bt.args = args; | |
190 | } | |
2f592f95 | 191 | |
3d5ee10a | 192 | static void |
9349e5f7 PE |
193 | set_backtrace_nargs (union specbinding *pdl, ptrdiff_t n) |
194 | { | |
195 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
196 | pdl->bt.nargs = n; | |
197 | } | |
2f592f95 | 198 | |
3d5ee10a | 199 | static void |
9349e5f7 PE |
200 | set_backtrace_debug_on_exit (union specbinding *pdl, bool doe) |
201 | { | |
202 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
203 | pdl->bt.debug_on_exit = doe; | |
204 | } | |
2f592f95 SM |
205 | |
206 | /* Helper functions to scan the backtrace. */ | |
207 | ||
9349e5f7 PE |
208 | bool |
209 | backtrace_p (union specbinding *pdl) | |
2f592f95 | 210 | { return pdl >= specpdl; } |
a8a7c5f6 | 211 | |
9349e5f7 | 212 | union specbinding * |
3d5ee10a | 213 | backtrace_top (void) |
e46f2325 | 214 | { |
9349e5f7 | 215 | union specbinding *pdl = specpdl_ptr - 1; |
a8a7c5f6 | 216 | while (backtrace_p (pdl) && pdl->kind != SPECPDL_BACKTRACE) |
2f592f95 SM |
217 | pdl--; |
218 | return pdl; | |
e46f2325 | 219 | } |
a8a7c5f6 | 220 | |
9349e5f7 PE |
221 | union specbinding * |
222 | backtrace_next (union specbinding *pdl) | |
e46f2325 | 223 | { |
2f592f95 SM |
224 | pdl--; |
225 | while (backtrace_p (pdl) && pdl->kind != SPECPDL_BACKTRACE) | |
226 | pdl--; | |
227 | return pdl; | |
e46f2325 DA |
228 | } |
229 | ||
2f592f95 | 230 | |
dfcf069d | 231 | void |
d3da34e0 | 232 | init_eval_once (void) |
db9f0278 | 233 | { |
98e8eae1 | 234 | enum { size = 50 }; |
9349e5f7 | 235 | union specbinding *pdlvec = xmalloc ((size + 1) * sizeof *specpdl); |
98e8eae1 | 236 | specpdl_size = size; |
9349e5f7 | 237 | specpdl = specpdl_ptr = pdlvec + 1; |
6588243d | 238 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
c530e1c2 | 239 | max_specpdl_size = 1300; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 240 | max_lisp_eval_depth = 600; |
34d470ba RS |
241 | |
242 | Vrun_hooks = Qnil; | |
db9f0278 JB |
243 | } |
244 | ||
dfcf069d | 245 | void |
d3da34e0 | 246 | init_eval (void) |
db9f0278 JB |
247 | { |
248 | specpdl_ptr = specpdl; | |
249 | catchlist = 0; | |
250 | handlerlist = 0; | |
db9f0278 JB |
251 | Vquit_flag = Qnil; |
252 | debug_on_next_call = 0; | |
253 | lisp_eval_depth = 0; | |
87e21fbd | 254 | #ifdef DEBUG_GCPRO |
15934ffa | 255 | gcpro_level = 0; |
87e21fbd | 256 | #endif |
be857679 | 257 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 258 | when_entered_debugger = -1; |
db9f0278 JB |
259 | } |
260 | ||
f6d62986 | 261 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb | 262 | |
27e498e6 | 263 | static void |
d3da34e0 | 264 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
265 | { |
266 | max_specpdl_size = XINT (XCAR (data)); | |
267 | max_lisp_eval_depth = XINT (XCDR (data)); | |
268 | } | |
269 | ||
270 | /* Call the Lisp debugger, giving it argument ARG. */ | |
271 | ||
7f7e0167 | 272 | Lisp_Object |
d3da34e0 | 273 | call_debugger (Lisp_Object arg) |
db9f0278 | 274 | { |
1882aa38 | 275 | bool debug_while_redisplaying; |
d311d28c | 276 | ptrdiff_t count = SPECPDL_INDEX (); |
3648c842 | 277 | Lisp_Object val; |
5816888b | 278 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 279 | |
9f5903bb RS |
280 | /* Temporarily bump up the stack limits, |
281 | so the debugger won't run out of stack. */ | |
177c0ea7 | 282 | |
9f5903bb RS |
283 | max_specpdl_size += 1; |
284 | record_unwind_protect (restore_stack_limits, | |
285 | Fcons (make_number (old_max), | |
286 | make_number (max_lisp_eval_depth))); | |
287 | max_specpdl_size = old_max; | |
288 | ||
289 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
290 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
291 | ||
98e8eae1 | 292 | if (max_specpdl_size - 100 < SPECPDL_INDEX ()) |
9f5903bb | 293 | max_specpdl_size = SPECPDL_INDEX () + 100; |
177c0ea7 | 294 | |
d148e14d | 295 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
296 | if (display_hourglass_p) |
297 | cancel_hourglass (); | |
237c23b0 GM |
298 | #endif |
299 | ||
db9f0278 | 300 | debug_on_next_call = 0; |
be857679 | 301 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
302 | |
303 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
304 | displayed if the debugger is invoked during redisplay. */ | |
305 | debug_while_redisplaying = redisplaying_p; | |
306 | redisplaying_p = 0; | |
556d7314 GM |
307 | specbind (intern ("debugger-may-continue"), |
308 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 309 | specbind (Qinhibit_redisplay, Qnil); |
45b82ad0 | 310 | specbind (Qinhibit_debugger, Qt); |
9db6f6b4 GM |
311 | |
312 | #if 0 /* Binding this prevents execution of Lisp code during | |
313 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 314 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 315 | #endif |
177c0ea7 | 316 | |
3648c842 GM |
317 | val = apply1 (Vdebugger, arg); |
318 | ||
319 | /* Interrupting redisplay and resuming it later is not safe under | |
320 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 321 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
322 | if (debug_while_redisplaying) |
323 | Ftop_level (); | |
324 | ||
556d7314 | 325 | return unbind_to (count, val); |
db9f0278 JB |
326 | } |
327 | ||
475545b5 | 328 | static void |
d3da34e0 | 329 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
330 | { |
331 | debug_on_next_call = 0; | |
2f592f95 | 332 | set_backtrace_debug_on_exit (specpdl_ptr - 1, true); |
6c6f1994 | 333 | call_debugger (list1 (code)); |
db9f0278 JB |
334 | } |
335 | \f | |
336 | /* NOTE!!! Every function that can call EVAL must protect its args | |
337 | and temporaries from garbage collection while it needs them. | |
338 | The definition of `For' shows what you have to do. */ | |
339 | ||
340 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
341 | doc: /* Eval args until one of them yields non-nil, then return that value. |
342 | The remaining args are not evalled at all. | |
343 | If all args return nil, return nil. | |
533eb34b | 344 | usage: (or CONDITIONS...) */) |
5842a27b | 345 | (Lisp_Object args) |
db9f0278 | 346 | { |
e509f168 | 347 | register Lisp_Object val = Qnil; |
db9f0278 JB |
348 | struct gcpro gcpro1; |
349 | ||
e509f168 | 350 | GCPRO1 (args); |
db9f0278 | 351 | |
e509f168 | 352 | while (CONSP (args)) |
db9f0278 | 353 | { |
defb1411 | 354 | val = eval_sub (XCAR (args)); |
265a9e55 | 355 | if (!NILP (val)) |
db9f0278 | 356 | break; |
e509f168 | 357 | args = XCDR (args); |
db9f0278 | 358 | } |
db9f0278 JB |
359 | |
360 | UNGCPRO; | |
361 | return val; | |
362 | } | |
363 | ||
364 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 365 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
366 | The remaining args are not evalled at all. |
367 | If no arg yields nil, return the last arg's value. | |
533eb34b | 368 | usage: (and CONDITIONS...) */) |
5842a27b | 369 | (Lisp_Object args) |
db9f0278 | 370 | { |
e509f168 | 371 | register Lisp_Object val = Qt; |
db9f0278 JB |
372 | struct gcpro gcpro1; |
373 | ||
e509f168 | 374 | GCPRO1 (args); |
db9f0278 | 375 | |
e509f168 | 376 | while (CONSP (args)) |
db9f0278 | 377 | { |
defb1411 | 378 | val = eval_sub (XCAR (args)); |
265a9e55 | 379 | if (NILP (val)) |
db9f0278 | 380 | break; |
e509f168 | 381 | args = XCDR (args); |
db9f0278 | 382 | } |
db9f0278 JB |
383 | |
384 | UNGCPRO; | |
385 | return val; | |
386 | } | |
387 | ||
388 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 389 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
390 | Returns the value of THEN or the value of the last of the ELSE's. |
391 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
392 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 393 | usage: (if COND THEN ELSE...) */) |
5842a27b | 394 | (Lisp_Object args) |
db9f0278 JB |
395 | { |
396 | register Lisp_Object cond; | |
397 | struct gcpro gcpro1; | |
398 | ||
399 | GCPRO1 (args); | |
defb1411 | 400 | cond = eval_sub (Fcar (args)); |
db9f0278 JB |
401 | UNGCPRO; |
402 | ||
265a9e55 | 403 | if (!NILP (cond)) |
defb1411 | 404 | return eval_sub (Fcar (Fcdr (args))); |
db9f0278 JB |
405 | return Fprogn (Fcdr (Fcdr (args))); |
406 | } | |
407 | ||
408 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
409 | doc: /* Try each clause until one succeeds. |
410 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
411 | and, if the value is non-nil, this clause succeeds: | |
412 | then the expressions in BODY are evaluated and the last one's | |
413 | value is the value of the cond-form. | |
414 | If no clause succeeds, cond returns nil. | |
415 | If a clause has one element, as in (CONDITION), | |
416 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 417 | usage: (cond CLAUSES...) */) |
5842a27b | 418 | (Lisp_Object args) |
db9f0278 JB |
419 | { |
420 | register Lisp_Object clause, val; | |
421 | struct gcpro gcpro1; | |
422 | ||
423 | val = Qnil; | |
424 | GCPRO1 (args); | |
265a9e55 | 425 | while (!NILP (args)) |
db9f0278 JB |
426 | { |
427 | clause = Fcar (args); | |
defb1411 | 428 | val = eval_sub (Fcar (clause)); |
265a9e55 | 429 | if (!NILP (val)) |
db9f0278 | 430 | { |
03699b14 KR |
431 | if (!EQ (XCDR (clause), Qnil)) |
432 | val = Fprogn (XCDR (clause)); | |
db9f0278 JB |
433 | break; |
434 | } | |
03699b14 | 435 | args = XCDR (args); |
db9f0278 JB |
436 | } |
437 | UNGCPRO; | |
438 | ||
439 | return val; | |
440 | } | |
441 | ||
a7ca3326 | 442 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, |
9dbc9081 | 443 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 444 | usage: (progn BODY...) */) |
27e498e6 | 445 | (Lisp_Object body) |
db9f0278 | 446 | { |
27e498e6 | 447 | Lisp_Object val = Qnil; |
db9f0278 JB |
448 | struct gcpro gcpro1; |
449 | ||
27e498e6 | 450 | GCPRO1 (body); |
db9f0278 | 451 | |
27e498e6 | 452 | while (CONSP (body)) |
db9f0278 | 453 | { |
27e498e6 PE |
454 | val = eval_sub (XCAR (body)); |
455 | body = XCDR (body); | |
db9f0278 | 456 | } |
db9f0278 JB |
457 | |
458 | UNGCPRO; | |
459 | return val; | |
460 | } | |
461 | ||
27e498e6 PE |
462 | /* Evaluate BODY sequentually, discarding its value. Suitable for |
463 | record_unwind_protect. */ | |
464 | ||
465 | void | |
466 | unwind_body (Lisp_Object body) | |
467 | { | |
468 | Fprogn (body); | |
469 | } | |
470 | ||
db9f0278 | 471 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, |
bdee2ef3 | 472 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
473 | The value of FIRST is saved during the evaluation of the remaining args, |
474 | whose values are discarded. | |
7a25dc6d | 475 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 476 | (Lisp_Object args) |
db9f0278 JB |
477 | { |
478 | Lisp_Object val; | |
479 | register Lisp_Object args_left; | |
480 | struct gcpro gcpro1, gcpro2; | |
db9f0278 JB |
481 | |
482 | args_left = args; | |
483 | val = Qnil; | |
484 | GCPRO2 (args, val); | |
485 | ||
856bbc81 PE |
486 | val = eval_sub (XCAR (args_left)); |
487 | while (CONSP (args_left = XCDR (args_left))) | |
488 | eval_sub (XCAR (args_left)); | |
db9f0278 JB |
489 | |
490 | UNGCPRO; | |
491 | return val; | |
492 | } | |
493 | ||
494 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 495 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
496 | The value of FORM2 is saved during the evaluation of the |
497 | remaining args, whose values are discarded. | |
498 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 499 | (Lisp_Object args) |
db9f0278 | 500 | { |
856bbc81 | 501 | struct gcpro gcpro1; |
db9f0278 | 502 | |
856bbc81 | 503 | GCPRO1 (args); |
856bbc81 | 504 | eval_sub (XCAR (args)); |
a63df926 PE |
505 | UNGCPRO; |
506 | return Fprog1 (XCDR (args)); | |
db9f0278 JB |
507 | } |
508 | ||
509 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
510 | doc: /* Set each SYM to the value of its VAL. |
511 | The symbols SYM are variables; they are literal (not evaluated). | |
512 | The values VAL are expressions; they are evaluated. | |
513 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
514 | The second VAL is not computed until after the first SYM is set, and so on; | |
515 | each VAL can use the new value of variables set earlier in the `setq'. | |
516 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 517 | usage: (setq [SYM VAL]...) */) |
5842a27b | 518 | (Lisp_Object args) |
db9f0278 JB |
519 | { |
520 | register Lisp_Object args_left; | |
b9598260 | 521 | register Lisp_Object val, sym, lex_binding; |
db9f0278 JB |
522 | struct gcpro gcpro1; |
523 | ||
1283140e | 524 | if (NILP (args)) |
db9f0278 JB |
525 | return Qnil; |
526 | ||
527 | args_left = args; | |
528 | GCPRO1 (args); | |
529 | ||
530 | do | |
531 | { | |
defb1411 | 532 | val = eval_sub (Fcar (Fcdr (args_left))); |
db9f0278 | 533 | sym = Fcar (args_left); |
b9598260 | 534 | |
defb1411 | 535 | /* Like for eval_sub, we do not check declared_special here since |
f07a954e SM |
536 | it's been done when let-binding. */ |
537 | if (!NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
b9598260 | 538 | && SYMBOLP (sym) |
f07a954e SM |
539 | && !NILP (lex_binding |
540 | = Fassq (sym, Vinternal_interpreter_environment))) | |
b9598260 SM |
541 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ |
542 | else | |
543 | Fset (sym, val); /* SYM is dynamically bound. */ | |
544 | ||
db9f0278 JB |
545 | args_left = Fcdr (Fcdr (args_left)); |
546 | } | |
5e617bc2 | 547 | while (!NILP (args_left)); |
db9f0278 JB |
548 | |
549 | UNGCPRO; | |
550 | return val; | |
551 | } | |
177c0ea7 | 552 | |
db9f0278 | 553 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 | 554 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
91a15bc6 SM |
555 | Warning: `quote' does not construct its return value, but just returns |
556 | the value that was pre-constructed by the Lisp reader (see info node | |
557 | `(elisp)Printed Representation'). | |
558 | This means that '(a . b) is not identical to (cons 'a 'b): the former | |
559 | does not cons. Quoting should be reserved for constants that will | |
560 | never be modified by side-effects, unless you like self-modifying code. | |
561 | See the common pitfall in info node `(elisp)Rearrangement' for an example | |
562 | of unexpected results when a quoted object is modified. | |
9dbc9081 | 563 | usage: (quote ARG) */) |
5842a27b | 564 | (Lisp_Object args) |
db9f0278 | 565 | { |
1283140e RS |
566 | if (!NILP (Fcdr (args))) |
567 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); | |
db9f0278 JB |
568 | return Fcar (args); |
569 | } | |
177c0ea7 | 570 | |
db9f0278 | 571 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
572 | doc: /* Like `quote', but preferred for objects which are functions. |
573 | In byte compilation, `function' causes its argument to be compiled. | |
574 | `quote' cannot do that. | |
575 | usage: (function ARG) */) | |
5842a27b | 576 | (Lisp_Object args) |
db9f0278 | 577 | { |
b9598260 SM |
578 | Lisp_Object quoted = XCAR (args); |
579 | ||
1283140e RS |
580 | if (!NILP (Fcdr (args))) |
581 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); | |
b9598260 SM |
582 | |
583 | if (!NILP (Vinternal_interpreter_environment) | |
584 | && CONSP (quoted) | |
585 | && EQ (XCAR (quoted), Qlambda)) | |
586 | /* This is a lambda expression within a lexical environment; | |
587 | return an interpreted closure instead of a simple lambda. */ | |
23aba0ea SM |
588 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, |
589 | XCDR (quoted))); | |
b9598260 SM |
590 | else |
591 | /* Simply quote the argument. */ | |
592 | return quoted; | |
db9f0278 JB |
593 | } |
594 | ||
e0f331ab | 595 | |
1848d15d | 596 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 597 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 598 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 599 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
600 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
601 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
602 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
603 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 604 | The return value is BASE-VARIABLE. */) |
5842a27b | 605 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
606 | { |
607 | struct Lisp_Symbol *sym; | |
1848d15d | 608 | |
4a9308b8 JB |
609 | CHECK_SYMBOL (new_alias); |
610 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 611 | |
4a9308b8 | 612 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
613 | |
614 | if (sym->constant) | |
178f2507 SM |
615 | /* Not sure why, but why not? */ |
616 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
617 | |
618 | switch (sym->redirect) | |
619 | { | |
620 | case SYMBOL_FORWARDED: | |
621 | error ("Cannot make an internal variable an alias"); | |
622 | case SYMBOL_LOCALIZED: | |
623 | error ("Don't know how to make a localized variable an alias"); | |
624 | } | |
625 | ||
dd60787c | 626 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
627 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
628 | so that old-code that affects n_a before the aliasing is setup | |
629 | still works. */ | |
630 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 631 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
632 | |
633 | { | |
9349e5f7 | 634 | union specbinding *p; |
ce5b453a | 635 | |
bc985141 | 636 | for (p = specpdl_ptr; p > specpdl; ) |
2f592f95 SM |
637 | if ((--p)->kind >= SPECPDL_LET |
638 | && (EQ (new_alias, specpdl_symbol (p)))) | |
ce5b453a SM |
639 | error ("Don't know how to make a let-bound variable an alias"); |
640 | } | |
641 | ||
b9598260 | 642 | sym->declared_special = 1; |
0ac30604 | 643 | XSYMBOL (base_variable)->declared_special = 1; |
ce5b453a SM |
644 | sym->redirect = SYMBOL_VARALIAS; |
645 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
646 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
647 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
648 | /* Even if docstring is nil: remove old docstring. */ |
649 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 650 | |
4a9308b8 | 651 | return base_variable; |
19cebf5a GM |
652 | } |
653 | ||
654 | ||
db9f0278 | 655 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 656 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
c3a70e2b CY |
657 | You are not required to define a variable in order to use it, but |
658 | defining it lets you supply an initial value and documentation, which | |
659 | can be referred to by the Emacs help facilities and other programming | |
660 | tools. The `defvar' form also declares the variable as \"special\", | |
661 | so that it is always dynamically bound even if `lexical-binding' is t. | |
662 | ||
663 | The optional argument INITVALUE is evaluated, and used to set SYMBOL, | |
664 | only if SYMBOL's value is void. If SYMBOL is buffer-local, its | |
665 | default value is what is set; buffer-local values are not affected. | |
9dbc9081 | 666 | If INITVALUE is missing, SYMBOL's value is not set. |
733f68b6 LT |
667 | |
668 | If SYMBOL has a local binding, then this form affects the local | |
669 | binding. This is usually not what you want. Thus, if you need to | |
670 | load a file defining variables, with this form or with `defconst' or | |
671 | `defcustom', you should always load that file _outside_ any bindings | |
672 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
673 | this respect.) | |
c3a70e2b CY |
674 | |
675 | The optional argument DOCSTRING is a documentation string for the | |
676 | variable. | |
677 | ||
678 | To define a user option, use `defcustom' instead of `defvar'. | |
2df5238c | 679 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 680 | (Lisp_Object args) |
db9f0278 | 681 | { |
a42ba017 | 682 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
683 | |
684 | sym = Fcar (args); | |
a42ba017 RS |
685 | tail = Fcdr (args); |
686 | if (!NILP (Fcdr (Fcdr (tail)))) | |
921baa95 | 687 | error ("Too many arguments"); |
a42ba017 | 688 | |
33568849 | 689 | tem = Fdefault_boundp (sym); |
a42ba017 | 690 | if (!NILP (tail)) |
db9f0278 | 691 | { |
ba83908c SM |
692 | /* Do it before evaluating the initial value, for self-references. */ |
693 | XSYMBOL (sym)->declared_special = 1; | |
590130fb | 694 | |
265a9e55 | 695 | if (NILP (tem)) |
defb1411 | 696 | Fset_default (sym, eval_sub (Fcar (tail))); |
d0bce91e SM |
697 | else |
698 | { /* Check if there is really a global binding rather than just a let | |
699 | binding that shadows the global unboundness of the var. */ | |
9349e5f7 | 700 | union specbinding *pdl = specpdl_ptr; |
d311d28c | 701 | while (pdl > specpdl) |
d0bce91e | 702 | { |
2f592f95 SM |
703 | if ((--pdl)->kind >= SPECPDL_LET |
704 | && EQ (specpdl_symbol (pdl), sym) | |
705 | && EQ (specpdl_old_value (pdl), Qunbound)) | |
d0bce91e | 706 | { |
23ba2705 SM |
707 | message_with_string |
708 | ("Warning: defvar ignored because %s is let-bound", | |
709 | SYMBOL_NAME (sym), 1); | |
d0bce91e SM |
710 | break; |
711 | } | |
712 | } | |
713 | } | |
33568849 | 714 | tail = Fcdr (tail); |
e509f168 SM |
715 | tem = Fcar (tail); |
716 | if (!NILP (tem)) | |
33568849 | 717 | { |
33568849 SM |
718 | if (!NILP (Vpurify_flag)) |
719 | tem = Fpurecopy (tem); | |
720 | Fput (sym, Qvariable_documentation, tem); | |
721 | } | |
6fd797f5 | 722 | LOADHIST_ATTACH (sym); |
db9f0278 | 723 | } |
f07a954e SM |
724 | else if (!NILP (Vinternal_interpreter_environment) |
725 | && !XSYMBOL (sym)->declared_special) | |
726 | /* A simple (defvar foo) with lexical scoping does "nothing" except | |
727 | declare that var to be dynamically scoped *locally* (i.e. within | |
728 | the current file or let-block). */ | |
23ba2705 SM |
729 | Vinternal_interpreter_environment |
730 | = Fcons (sym, Vinternal_interpreter_environment); | |
33568849 | 731 | else |
d28a2170 PE |
732 | { |
733 | /* Simple (defvar <var>) should not count as a definition at all. | |
734 | It could get in the way of other definitions, and unloading this | |
735 | package could try to make the variable unbound. */ | |
736 | } | |
addf35fd | 737 | |
db9f0278 JB |
738 | return sym; |
739 | } | |
740 | ||
741 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 | 742 | doc: /* Define SYMBOL as a constant variable. |
c3a70e2b CY |
743 | This declares that neither programs nor users should ever change the |
744 | value. This constancy is not actually enforced by Emacs Lisp, but | |
745 | SYMBOL is marked as a special variable so that it is never lexically | |
746 | bound. | |
747 | ||
748 | The `defconst' form always sets the value of SYMBOL to the result of | |
749 | evalling INITVALUE. If SYMBOL is buffer-local, its default value is | |
750 | what is set; buffer-local values are not affected. If SYMBOL has a | |
751 | local binding, then this form sets the local binding's value. | |
752 | However, you should normally not make local bindings for variables | |
753 | defined with this form. | |
754 | ||
755 | The optional DOCSTRING specifies the variable's documentation string. | |
7a25dc6d | 756 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 757 | (Lisp_Object args) |
db9f0278 JB |
758 | { |
759 | register Lisp_Object sym, tem; | |
760 | ||
761 | sym = Fcar (args); | |
a42ba017 | 762 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
921baa95 | 763 | error ("Too many arguments"); |
a42ba017 | 764 | |
defb1411 | 765 | tem = eval_sub (Fcar (Fcdr (args))); |
1182a7cb DL |
766 | if (!NILP (Vpurify_flag)) |
767 | tem = Fpurecopy (tem); | |
768 | Fset_default (sym, tem); | |
b9598260 | 769 | XSYMBOL (sym)->declared_special = 1; |
db9f0278 | 770 | tem = Fcar (Fcdr (Fcdr (args))); |
265a9e55 | 771 | if (!NILP (tem)) |
db9f0278 | 772 | { |
265a9e55 | 773 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
774 | tem = Fpurecopy (tem); |
775 | Fput (sym, Qvariable_documentation, tem); | |
776 | } | |
873759d5 | 777 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 778 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
779 | return sym; |
780 | } | |
781 | ||
513749ee SM |
782 | /* Make SYMBOL lexically scoped. */ |
783 | DEFUN ("internal-make-var-non-special", Fmake_var_non_special, | |
784 | Smake_var_non_special, 1, 1, 0, | |
785 | doc: /* Internal function. */) | |
786 | (Lisp_Object symbol) | |
787 | { | |
788 | CHECK_SYMBOL (symbol); | |
789 | XSYMBOL (symbol)->declared_special = 0; | |
790 | return Qnil; | |
791 | } | |
792 | ||
db9f0278 JB |
793 | \f |
794 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
795 | doc: /* Bind variables according to VARLIST then eval BODY. |
796 | The value of the last form in BODY is returned. | |
797 | Each element of VARLIST is a symbol (which is bound to nil) | |
798 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
799 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 800 | usage: (let* VARLIST BODY...) */) |
5842a27b | 801 | (Lisp_Object args) |
db9f0278 | 802 | { |
b9598260 | 803 | Lisp_Object varlist, var, val, elt, lexenv; |
d311d28c | 804 | ptrdiff_t count = SPECPDL_INDEX (); |
db9f0278 JB |
805 | struct gcpro gcpro1, gcpro2, gcpro3; |
806 | ||
807 | GCPRO3 (args, elt, varlist); | |
808 | ||
b9598260 SM |
809 | lexenv = Vinternal_interpreter_environment; |
810 | ||
db9f0278 | 811 | varlist = Fcar (args); |
b9598260 | 812 | while (CONSP (varlist)) |
db9f0278 JB |
813 | { |
814 | QUIT; | |
b9598260 SM |
815 | |
816 | elt = XCAR (varlist); | |
90165123 | 817 | if (SYMBOLP (elt)) |
b9598260 SM |
818 | { |
819 | var = elt; | |
820 | val = Qnil; | |
821 | } | |
08564963 | 822 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 823 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
824 | else |
825 | { | |
b9598260 | 826 | var = Fcar (elt); |
defb1411 | 827 | val = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 | 828 | } |
b9598260 | 829 | |
f07a954e SM |
830 | if (!NILP (lexenv) && SYMBOLP (var) |
831 | && !XSYMBOL (var)->declared_special | |
832 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
833 | /* Lexically bind VAR by adding it to the interpreter's binding |
834 | alist. */ | |
835 | { | |
f07a954e SM |
836 | Lisp_Object newenv |
837 | = Fcons (Fcons (var, val), Vinternal_interpreter_environment); | |
838 | if (EQ (Vinternal_interpreter_environment, lexenv)) | |
839 | /* Save the old lexical environment on the specpdl stack, | |
840 | but only for the first lexical binding, since we'll never | |
841 | need to revert to one of the intermediate ones. */ | |
842 | specbind (Qinternal_interpreter_environment, newenv); | |
843 | else | |
844 | Vinternal_interpreter_environment = newenv; | |
db9f0278 | 845 | } |
b9598260 SM |
846 | else |
847 | specbind (var, val); | |
848 | ||
849 | varlist = XCDR (varlist); | |
db9f0278 JB |
850 | } |
851 | UNGCPRO; | |
852 | val = Fprogn (Fcdr (args)); | |
853 | return unbind_to (count, val); | |
854 | } | |
855 | ||
856 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
857 | doc: /* Bind variables according to VARLIST then eval BODY. |
858 | The value of the last form in BODY is returned. | |
859 | Each element of VARLIST is a symbol (which is bound to nil) | |
860 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
861 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 862 | usage: (let VARLIST BODY...) */) |
5842a27b | 863 | (Lisp_Object args) |
db9f0278 | 864 | { |
b9598260 | 865 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 866 | register Lisp_Object elt, varlist; |
d311d28c | 867 | ptrdiff_t count = SPECPDL_INDEX (); |
f66c7cf8 | 868 | ptrdiff_t argnum; |
db9f0278 | 869 | struct gcpro gcpro1, gcpro2; |
3a7a9129 | 870 | USE_SAFE_ALLOCA; |
db9f0278 JB |
871 | |
872 | varlist = Fcar (args); | |
873 | ||
f6d62986 | 874 | /* Make space to hold the values to give the bound variables. */ |
db9f0278 | 875 | elt = Flength (varlist); |
b72e0717 | 876 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 | 877 | |
f6d62986 | 878 | /* Compute the values and store them in `temps'. */ |
db9f0278 JB |
879 | |
880 | GCPRO2 (args, *temps); | |
881 | gcpro2.nvars = 0; | |
882 | ||
67ee9f6e | 883 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
884 | { |
885 | QUIT; | |
67ee9f6e | 886 | elt = XCAR (varlist); |
90165123 | 887 | if (SYMBOLP (elt)) |
db9f0278 | 888 | temps [argnum++] = Qnil; |
08564963 | 889 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 890 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 | 891 | else |
defb1411 | 892 | temps [argnum++] = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 JB |
893 | gcpro2.nvars = argnum; |
894 | } | |
895 | UNGCPRO; | |
896 | ||
b9598260 SM |
897 | lexenv = Vinternal_interpreter_environment; |
898 | ||
db9f0278 | 899 | varlist = Fcar (args); |
67ee9f6e | 900 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 901 | { |
b9598260 SM |
902 | Lisp_Object var; |
903 | ||
67ee9f6e | 904 | elt = XCAR (varlist); |
b9598260 | 905 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 906 | tem = temps[argnum++]; |
b9598260 | 907 | |
f07a954e SM |
908 | if (!NILP (lexenv) && SYMBOLP (var) |
909 | && !XSYMBOL (var)->declared_special | |
910 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
911 | /* Lexically bind VAR by adding it to the lexenv alist. */ |
912 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 913 | else |
b9598260 SM |
914 | /* Dynamically bind VAR. */ |
915 | specbind (var, tem); | |
db9f0278 JB |
916 | } |
917 | ||
b9598260 SM |
918 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
919 | /* Instantiate a new lexical environment. */ | |
920 | specbind (Qinternal_interpreter_environment, lexenv); | |
921 | ||
db9f0278 | 922 | elt = Fprogn (Fcdr (args)); |
3a7a9129 | 923 | SAFE_FREE (); |
db9f0278 JB |
924 | return unbind_to (count, elt); |
925 | } | |
926 | ||
927 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
928 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
929 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
930 | until TEST returns nil. | |
7a25dc6d | 931 | usage: (while TEST BODY...) */) |
5842a27b | 932 | (Lisp_Object args) |
db9f0278 | 933 | { |
2b9bde76 | 934 | Lisp_Object test, body; |
db9f0278 JB |
935 | struct gcpro gcpro1, gcpro2; |
936 | ||
937 | GCPRO2 (test, body); | |
938 | ||
939 | test = Fcar (args); | |
940 | body = Fcdr (args); | |
defb1411 | 941 | while (!NILP (eval_sub (test))) |
db9f0278 JB |
942 | { |
943 | QUIT; | |
944 | Fprogn (body); | |
945 | } | |
946 | ||
947 | UNGCPRO; | |
948 | return Qnil; | |
949 | } | |
950 | ||
951 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
952 | doc: /* Return result of expanding macros at top level of FORM. |
953 | If FORM is not a macro call, it is returned unchanged. | |
954 | Otherwise, the macro is expanded and the expansion is considered | |
955 | in place of FORM. When a non-macro-call results, it is returned. | |
956 | ||
957 | The second optional arg ENVIRONMENT specifies an environment of macro | |
958 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 959 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 960 | { |
23d6b5a6 | 961 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
962 | register Lisp_Object expander, sym, def, tem; |
963 | ||
964 | while (1) | |
965 | { | |
966 | /* Come back here each time we expand a macro call, | |
967 | in case it expands into another macro call. */ | |
90165123 | 968 | if (!CONSP (form)) |
db9f0278 | 969 | break; |
23d6b5a6 | 970 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 971 | def = sym = XCAR (form); |
23d6b5a6 | 972 | tem = Qnil; |
db9f0278 JB |
973 | /* Trace symbols aliases to other symbols |
974 | until we get a symbol that is not an alias. */ | |
90165123 | 975 | while (SYMBOLP (def)) |
db9f0278 JB |
976 | { |
977 | QUIT; | |
23d6b5a6 | 978 | sym = def; |
79e8bfbf | 979 | tem = Fassq (sym, environment); |
265a9e55 | 980 | if (NILP (tem)) |
db9f0278 | 981 | { |
c644523b | 982 | def = XSYMBOL (sym)->function; |
eadf1faa | 983 | if (!NILP (def)) |
23d6b5a6 | 984 | continue; |
db9f0278 | 985 | } |
23d6b5a6 | 986 | break; |
db9f0278 | 987 | } |
79e8bfbf | 988 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 989 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 990 | if (NILP (tem)) |
db9f0278 | 991 | { |
79e8bfbf | 992 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 993 | Look at its function definition. */ |
7abaf5cc SM |
994 | struct gcpro gcpro1; |
995 | GCPRO1 (form); | |
996 | def = Fautoload_do_load (def, sym, Qmacro); | |
997 | UNGCPRO; | |
eadf1faa | 998 | if (!CONSP (def)) |
f6d62986 | 999 | /* Not defined or definition not suitable. */ |
db9f0278 | 1000 | break; |
7abaf5cc | 1001 | if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1002 | break; |
03699b14 | 1003 | else expander = XCDR (def); |
db9f0278 JB |
1004 | } |
1005 | else | |
1006 | { | |
03699b14 | 1007 | expander = XCDR (tem); |
265a9e55 | 1008 | if (NILP (expander)) |
db9f0278 JB |
1009 | break; |
1010 | } | |
4f18a4ed SM |
1011 | { |
1012 | Lisp_Object newform = apply1 (expander, XCDR (form)); | |
1013 | if (EQ (form, newform)) | |
1014 | break; | |
1015 | else | |
1016 | form = newform; | |
1017 | } | |
db9f0278 JB |
1018 | } |
1019 | return form; | |
1020 | } | |
1021 | \f | |
1022 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1023 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1024 | TAG is evalled to get the tag to use; it must not be nil. | |
1025 | ||
1026 | Then the BODY is executed. | |
1d632ccf | 1027 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1028 | If no throw happens, `catch' returns the value of the last BODY form. |
1029 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1030 | usage: (catch TAG BODY...) */) |
5842a27b | 1031 | (Lisp_Object args) |
db9f0278 JB |
1032 | { |
1033 | register Lisp_Object tag; | |
1034 | struct gcpro gcpro1; | |
1035 | ||
1036 | GCPRO1 (args); | |
defb1411 | 1037 | tag = eval_sub (Fcar (args)); |
db9f0278 JB |
1038 | UNGCPRO; |
1039 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
1040 | } | |
1041 | ||
1042 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1043 | FUNC should return a Lisp_Object. | |
2f592f95 | 1044 | This is how catches are done from within C code. */ |
db9f0278 JB |
1045 | |
1046 | Lisp_Object | |
d3da34e0 | 1047 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1048 | { |
1049 | /* This structure is made part of the chain `catchlist'. */ | |
1050 | struct catchtag c; | |
1051 | ||
1052 | /* Fill in the components of c, and put it on the list. */ | |
1053 | c.next = catchlist; | |
1054 | c.tag = tag; | |
1055 | c.val = Qnil; | |
db9f0278 JB |
1056 | c.handlerlist = handlerlist; |
1057 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1058 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1059 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1060 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1061 | c.gcpro = gcprolist; |
bcf28080 | 1062 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1063 | catchlist = &c; |
1064 | ||
1065 | /* Call FUNC. */ | |
0328b6de | 1066 | if (! sys_setjmp (c.jmp)) |
db9f0278 JB |
1067 | c.val = (*func) (arg); |
1068 | ||
1069 | /* Throw works by a longjmp that comes right here. */ | |
1070 | catchlist = c.next; | |
1071 | return c.val; | |
1072 | } | |
1073 | ||
ba410f40 JB |
1074 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1075 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1076 | |
4d7e6e51 | 1077 | This is the guts of Fthrow and Fsignal; they differ only in the way |
ba410f40 JB |
1078 | they choose the catch tag to throw to. A catch tag for a |
1079 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1080 | |
ba410f40 JB |
1081 | Before each catch is discarded, unbind all special bindings and |
1082 | execute all unwind-protect clauses made above that catch. Unwind | |
1083 | the handler stack as we go, so that the proper handlers are in | |
1084 | effect for each unwind-protect clause we run. At the end, restore | |
1085 | some static info saved in CATCH, and longjmp to the location | |
4d7e6e51 | 1086 | specified there. |
ba410f40 JB |
1087 | |
1088 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 | 1089 | |
845ca893 | 1090 | static _Noreturn void |
d3da34e0 | 1091 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 | 1092 | { |
1882aa38 | 1093 | bool last_time; |
db9f0278 | 1094 | |
ba410f40 JB |
1095 | /* Save the value in the tag. */ |
1096 | catch->val = value; | |
1097 | ||
0b31741c | 1098 | /* Restore certain special C variables. */ |
1cdc3155 | 1099 | set_poll_suppress_count (catch->poll_suppress_count); |
4d7e6e51 | 1100 | unblock_input_to (catch->interrupt_input_blocked); |
69bbd6bd | 1101 | immediate_quit = 0; |
82da7701 | 1102 | |
db9f0278 JB |
1103 | do |
1104 | { | |
1105 | last_time = catchlist == catch; | |
82da7701 JB |
1106 | |
1107 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1108 | handlers. */ |
db9f0278 JB |
1109 | unbind_to (catchlist->pdlcount, Qnil); |
1110 | handlerlist = catchlist->handlerlist; | |
1111 | catchlist = catchlist->next; | |
1112 | } | |
1113 | while (! last_time); | |
1114 | ||
bcf28080 | 1115 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1116 | gcprolist = catch->gcpro; |
15934ffa | 1117 | #ifdef DEBUG_GCPRO |
d8e2b5ba | 1118 | gcpro_level = gcprolist ? gcprolist->level + 1 : 0; |
15934ffa | 1119 | #endif |
db9f0278 | 1120 | lisp_eval_depth = catch->lisp_eval_depth; |
177c0ea7 | 1121 | |
0328b6de | 1122 | sys_longjmp (catch->jmp, 1); |
db9f0278 JB |
1123 | } |
1124 | ||
a7ca3326 | 1125 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, |
9dbc9081 PJ |
1126 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1127 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1128 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1129 | { |
1130 | register struct catchtag *c; | |
1131 | ||
8788120f KS |
1132 | if (!NILP (tag)) |
1133 | for (c = catchlist; c; c = c->next) | |
1134 | { | |
1135 | if (EQ (c->tag, tag)) | |
1136 | unwind_to_catch (c, value); | |
1137 | } | |
734d55a2 | 1138 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1139 | } |
1140 | ||
1141 | ||
1142 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1143 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1144 | If BODYFORM completes normally, its value is returned | |
1145 | after executing the UNWINDFORMS. | |
1146 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1147 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1148 | (Lisp_Object args) |
db9f0278 JB |
1149 | { |
1150 | Lisp_Object val; | |
d311d28c | 1151 | ptrdiff_t count = SPECPDL_INDEX (); |
db9f0278 | 1152 | |
27e498e6 | 1153 | record_unwind_protect (unwind_body, Fcdr (args)); |
defb1411 | 1154 | val = eval_sub (Fcar (args)); |
177c0ea7 | 1155 | return unbind_to (count, val); |
db9f0278 JB |
1156 | } |
1157 | \f | |
db9f0278 | 1158 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, |
9dbc9081 | 1159 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1160 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1161 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1162 | where the BODY is made of Lisp expressions. | |
1163 | ||
1164 | A handler is applicable to an error | |
1165 | if CONDITION-NAME is one of the error's condition names. | |
1166 | If an error happens, the first applicable handler is run. | |
1167 | ||
024a2d76 CY |
1168 | The car of a handler may be a list of condition names instead of a |
1169 | single condition name; then it handles all of them. If the special | |
1170 | condition name `debug' is present in this list, it allows another | |
1171 | condition in the list to run the debugger if `debug-on-error' and the | |
1172 | other usual mechanisms says it should (otherwise, `condition-case' | |
1173 | suppresses the debugger). | |
9dbc9081 | 1174 | |
c997bb25 RS |
1175 | When a handler handles an error, control returns to the `condition-case' |
1176 | and it executes the handler's BODY... | |
d0acbbaf | 1177 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1178 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1179 | Then the value of the last BODY form is returned from the `condition-case' |
1180 | expression. | |
9dbc9081 | 1181 | |
9dbc9081 | 1182 | See also the function `signal' for more info. |
2b47b74d | 1183 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1184 | (Lisp_Object args) |
db9f0278 | 1185 | { |
40bce90b PE |
1186 | Lisp_Object var = Fcar (args); |
1187 | Lisp_Object bodyform = Fcar (Fcdr (args)); | |
1188 | Lisp_Object handlers = Fcdr (Fcdr (args)); | |
ee830945 RS |
1189 | |
1190 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1191 | } | |
1192 | ||
1193 | /* Like Fcondition_case, but the args are separate | |
1194 | rather than passed in a list. Used by Fbyte_code. */ | |
1195 | ||
1196 | Lisp_Object | |
d3da34e0 JB |
1197 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1198 | Lisp_Object handlers) | |
ee830945 RS |
1199 | { |
1200 | Lisp_Object val; | |
1201 | struct catchtag c; | |
1202 | struct handler h; | |
1203 | ||
b7826503 | 1204 | CHECK_SYMBOL (var); |
82da7701 | 1205 | |
2b47b74d | 1206 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1207 | { |
1208 | Lisp_Object tem; | |
2b47b74d | 1209 | tem = XCAR (val); |
5f96776a RS |
1210 | if (! (NILP (tem) |
1211 | || (CONSP (tem) | |
03699b14 KR |
1212 | && (SYMBOLP (XCAR (tem)) |
1213 | || CONSP (XCAR (tem)))))) | |
e6c3da20 EZ |
1214 | error ("Invalid condition handler: %s", |
1215 | SDATA (Fprin1_to_string (tem, Qt))); | |
82da7701 | 1216 | } |
db9f0278 JB |
1217 | |
1218 | c.tag = Qnil; | |
1219 | c.val = Qnil; | |
db9f0278 JB |
1220 | c.handlerlist = handlerlist; |
1221 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1222 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1223 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1224 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1225 | c.gcpro = gcprolist; |
bcf28080 | 1226 | c.byte_stack = byte_stack_list; |
0328b6de | 1227 | if (sys_setjmp (c.jmp)) |
db9f0278 | 1228 | { |
265a9e55 | 1229 | if (!NILP (h.var)) |
bb8e180f | 1230 | specbind (h.var, c.val); |
9d58218c | 1231 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1232 | |
1233 | /* Note that this just undoes the binding of h.var; whoever | |
1234 | longjumped to us unwound the stack to c.pdlcount before | |
2f592f95 | 1235 | throwing. */ |
db9f0278 JB |
1236 | unbind_to (c.pdlcount, Qnil); |
1237 | return val; | |
1238 | } | |
1239 | c.next = catchlist; | |
1240 | catchlist = &c; | |
177c0ea7 | 1241 | |
82da7701 JB |
1242 | h.var = var; |
1243 | h.handler = handlers; | |
db9f0278 | 1244 | h.next = handlerlist; |
db9f0278 JB |
1245 | h.tag = &c; |
1246 | handlerlist = &h; | |
1247 | ||
defb1411 | 1248 | val = eval_sub (bodyform); |
db9f0278 JB |
1249 | catchlist = c.next; |
1250 | handlerlist = h.next; | |
1251 | return val; | |
1252 | } | |
1253 | ||
f029ca5f RS |
1254 | /* Call the function BFUN with no arguments, catching errors within it |
1255 | according to HANDLERS. If there is an error, call HFUN with | |
1256 | one argument which is the data that describes the error: | |
1257 | (SIGNALNAME . DATA) | |
1258 | ||
1259 | HANDLERS can be a list of conditions to catch. | |
1260 | If HANDLERS is Qt, catch all errors. | |
1261 | If HANDLERS is Qerror, catch all errors | |
1262 | but allow the debugger to run if that is enabled. */ | |
1263 | ||
db9f0278 | 1264 | Lisp_Object |
d3da34e0 JB |
1265 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1266 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1267 | { |
1268 | Lisp_Object val; | |
1269 | struct catchtag c; | |
1270 | struct handler h; | |
1271 | ||
1272 | c.tag = Qnil; | |
1273 | c.val = Qnil; | |
db9f0278 JB |
1274 | c.handlerlist = handlerlist; |
1275 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1276 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1277 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1278 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1279 | c.gcpro = gcprolist; |
bcf28080 | 1280 | c.byte_stack = byte_stack_list; |
0328b6de | 1281 | if (sys_setjmp (c.jmp)) |
db9f0278 | 1282 | { |
9d58218c | 1283 | return (*hfun) (c.val); |
db9f0278 JB |
1284 | } |
1285 | c.next = catchlist; | |
1286 | catchlist = &c; | |
1287 | h.handler = handlers; | |
1288 | h.var = Qnil; | |
db9f0278 JB |
1289 | h.next = handlerlist; |
1290 | h.tag = &c; | |
1291 | handlerlist = &h; | |
1292 | ||
1293 | val = (*bfun) (); | |
1294 | catchlist = c.next; | |
1295 | handlerlist = h.next; | |
1296 | return val; | |
1297 | } | |
1298 | ||
2659a09f | 1299 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1300 | |
d227775c | 1301 | Lisp_Object |
d3da34e0 JB |
1302 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1303 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1304 | { |
1305 | Lisp_Object val; | |
1306 | struct catchtag c; | |
1307 | struct handler h; | |
1308 | ||
1309 | c.tag = Qnil; | |
1310 | c.val = Qnil; | |
d227775c RS |
1311 | c.handlerlist = handlerlist; |
1312 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1313 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1314 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1315 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1316 | c.gcpro = gcprolist; |
bcf28080 | 1317 | c.byte_stack = byte_stack_list; |
0328b6de | 1318 | if (sys_setjmp (c.jmp)) |
d227775c | 1319 | { |
9d58218c | 1320 | return (*hfun) (c.val); |
d227775c RS |
1321 | } |
1322 | c.next = catchlist; | |
1323 | catchlist = &c; | |
1324 | h.handler = handlers; | |
1325 | h.var = Qnil; | |
1326 | h.next = handlerlist; | |
1327 | h.tag = &c; | |
1328 | handlerlist = &h; | |
1329 | ||
1330 | val = (*bfun) (arg); | |
1331 | catchlist = c.next; | |
1332 | handlerlist = h.next; | |
1333 | return val; | |
1334 | } | |
10b29d41 | 1335 | |
53967e09 CY |
1336 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1337 | its arguments. */ | |
1338 | ||
1339 | Lisp_Object | |
178f2507 SM |
1340 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1341 | Lisp_Object arg1, | |
1342 | Lisp_Object arg2, | |
1343 | Lisp_Object handlers, | |
1344 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1345 | { |
1346 | Lisp_Object val; | |
1347 | struct catchtag c; | |
1348 | struct handler h; | |
1349 | ||
53967e09 CY |
1350 | c.tag = Qnil; |
1351 | c.val = Qnil; | |
53967e09 CY |
1352 | c.handlerlist = handlerlist; |
1353 | c.lisp_eval_depth = lisp_eval_depth; | |
1354 | c.pdlcount = SPECPDL_INDEX (); | |
1355 | c.poll_suppress_count = poll_suppress_count; | |
1356 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1357 | c.gcpro = gcprolist; | |
1358 | c.byte_stack = byte_stack_list; | |
0328b6de | 1359 | if (sys_setjmp (c.jmp)) |
53967e09 CY |
1360 | { |
1361 | return (*hfun) (c.val); | |
1362 | } | |
1363 | c.next = catchlist; | |
1364 | catchlist = &c; | |
1365 | h.handler = handlers; | |
1366 | h.var = Qnil; | |
1367 | h.next = handlerlist; | |
1368 | h.tag = &c; | |
1369 | handlerlist = &h; | |
1370 | ||
1371 | val = (*bfun) (arg1, arg2); | |
1372 | catchlist = c.next; | |
1373 | handlerlist = h.next; | |
1374 | return val; | |
1375 | } | |
10b29d41 | 1376 | |
2659a09f | 1377 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1378 | and ARGS as second argument. */ |
1379 | ||
1380 | Lisp_Object | |
f66c7cf8 PE |
1381 | internal_condition_case_n (Lisp_Object (*bfun) (ptrdiff_t, Lisp_Object *), |
1382 | ptrdiff_t nargs, | |
178f2507 SM |
1383 | Lisp_Object *args, |
1384 | Lisp_Object handlers, | |
cc92c454 SM |
1385 | Lisp_Object (*hfun) (Lisp_Object err, |
1386 | ptrdiff_t nargs, | |
1387 | Lisp_Object *args)) | |
10b29d41 GM |
1388 | { |
1389 | Lisp_Object val; | |
1390 | struct catchtag c; | |
1391 | struct handler h; | |
1392 | ||
1393 | c.tag = Qnil; | |
1394 | c.val = Qnil; | |
10b29d41 GM |
1395 | c.handlerlist = handlerlist; |
1396 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1397 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1398 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1399 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1400 | c.gcpro = gcprolist; |
1401 | c.byte_stack = byte_stack_list; | |
0328b6de | 1402 | if (sys_setjmp (c.jmp)) |
10b29d41 | 1403 | { |
cc92c454 | 1404 | return (*hfun) (c.val, nargs, args); |
10b29d41 GM |
1405 | } |
1406 | c.next = catchlist; | |
1407 | catchlist = &c; | |
1408 | h.handler = handlers; | |
1409 | h.var = Qnil; | |
1410 | h.next = handlerlist; | |
1411 | h.tag = &c; | |
1412 | handlerlist = &h; | |
1413 | ||
1414 | val = (*bfun) (nargs, args); | |
1415 | catchlist = c.next; | |
1416 | handlerlist = h.next; | |
1417 | return val; | |
1418 | } | |
1419 | ||
d227775c | 1420 | \f |
7d47b580 | 1421 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object); |
1882aa38 PE |
1422 | static bool maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1423 | Lisp_Object data); | |
db9f0278 | 1424 | |
6d5eb5b0 SM |
1425 | void |
1426 | process_quit_flag (void) | |
1427 | { | |
1428 | Lisp_Object flag = Vquit_flag; | |
1429 | Vquit_flag = Qnil; | |
1430 | if (EQ (flag, Qkill_emacs)) | |
1431 | Fkill_emacs (Qnil); | |
1432 | if (EQ (Vthrow_on_input, flag)) | |
1433 | Fthrow (Vthrow_on_input, Qt); | |
1434 | Fsignal (Qquit, Qnil); | |
1435 | } | |
1436 | ||
a7ca3326 | 1437 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, |
9dbc9081 PJ |
1438 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1439 | This function does not return. | |
1440 | ||
1441 | An error symbol is a symbol with an `error-conditions' property | |
1442 | that is a list of condition names. | |
1443 | A handler for any of those names will get to handle this signal. | |
1444 | The symbol `error' should normally be one of them. | |
1445 | ||
1446 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1447 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1448 | error message is constructed. | |
9dbc9081 PJ |
1449 | If the signal is handled, DATA is made available to the handler. |
1450 | See also the function `condition-case'. */) | |
5842a27b | 1451 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1452 | { |
bfa8ca43 | 1453 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1454 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1455 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1456 | Lisp_Object conditions; |
c11d3d17 | 1457 | Lisp_Object string; |
e7f7fbaa SM |
1458 | Lisp_Object real_error_symbol |
1459 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1460 | register Lisp_Object clause = Qnil; | |
1461 | struct handler *h; | |
db9f0278 | 1462 | |
0caaedb1 | 1463 | immediate_quit = 0; |
d063129f | 1464 | abort_on_gc = 0; |
db9f0278 | 1465 | if (gc_in_progress || waiting_for_input) |
1088b922 | 1466 | emacs_abort (); |
db9f0278 | 1467 | |
26631f2b RS |
1468 | #if 0 /* rms: I don't know why this was here, |
1469 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1470 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1471 | if (display_hourglass_p) |
1472 | cancel_hourglass (); | |
48f8dfa3 | 1473 | #endif |
177c0ea7 | 1474 | #endif |
48f8dfa3 | 1475 | |
61ede770 | 1476 | /* This hook is used by edebug. */ |
26631f2b RS |
1477 | if (! NILP (Vsignal_hook_function) |
1478 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1479 | { |
1480 | /* Edebug takes care of restoring these variables when it exits. */ | |
1481 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1482 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1483 | ||
1484 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1485 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1486 | ||
1487 | call2 (Vsignal_hook_function, error_symbol, data); | |
1488 | } | |
61ede770 | 1489 | |
1ea9dec4 | 1490 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1491 | |
a2ff3819 GM |
1492 | /* Remember from where signal was called. Skip over the frame for |
1493 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1494 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1495 | is a memory-full error. */ | |
090a072f | 1496 | Vsignaling_function = Qnil; |
2f592f95 | 1497 | if (!NILP (error_symbol)) |
090a072f | 1498 | { |
9349e5f7 | 1499 | union specbinding *pdl = backtrace_next (backtrace_top ()); |
2f592f95 SM |
1500 | if (backtrace_p (pdl) && EQ (backtrace_function (pdl), Qerror)) |
1501 | pdl = backtrace_next (pdl); | |
1502 | if (backtrace_p (pdl)) | |
1503 | Vsignaling_function = backtrace_function (pdl); | |
090a072f | 1504 | } |
a2ff3819 | 1505 | |
e7f7fbaa | 1506 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1507 | { |
7d47b580 | 1508 | clause = find_handler_clause (h->handler, conditions); |
265a9e55 | 1509 | if (!NILP (clause)) |
e7f7fbaa | 1510 | break; |
db9f0278 | 1511 | } |
475545b5 | 1512 | |
e7f7fbaa | 1513 | if (/* Don't run the debugger for a memory-full error. |
e7c1b6ef | 1514 | (There is no room in memory to do that!) */ |
e7f7fbaa SM |
1515 | !NILP (error_symbol) |
1516 | && (!NILP (Vdebug_on_signal) | |
1517 | /* If no handler is present now, try to run the debugger. */ | |
1518 | || NILP (clause) | |
bd1ba3e8 CY |
1519 | /* A `debug' symbol in the handler list disables the normal |
1520 | suppression of the debugger. */ | |
1521 | || (CONSP (clause) && CONSP (XCAR (clause)) | |
1522 | && !NILP (Fmemq (Qdebug, XCAR (clause)))) | |
e7f7fbaa SM |
1523 | /* Special handler that means "print a message and run debugger |
1524 | if requested". */ | |
1525 | || EQ (h->handler, Qerror))) | |
1526 | { | |
1882aa38 | 1527 | bool debugger_called |
e7f7fbaa SM |
1528 | = maybe_call_debugger (conditions, error_symbol, data); |
1529 | /* We can't return values to code which signaled an error, but we | |
1530 | can continue code which has signaled a quit. */ | |
1531 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
1532 | return Qnil; | |
475545b5 | 1533 | } |
db9f0278 | 1534 | |
e7f7fbaa SM |
1535 | if (!NILP (clause)) |
1536 | { | |
1537 | Lisp_Object unwind_data | |
1538 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 1539 | |
e7f7fbaa SM |
1540 | h->chosen_clause = clause; |
1541 | unwind_to_catch (h->tag, unwind_data); | |
1542 | } | |
1543 | else | |
1544 | { | |
1545 | if (catchlist != 0) | |
1546 | Fthrow (Qtop_level, Qt); | |
1547 | } | |
c11d3d17 | 1548 | |
1ea9dec4 | 1549 | if (! NILP (error_symbol)) |
c11d3d17 | 1550 | data = Fcons (error_symbol, data); |
475545b5 | 1551 | |
c11d3d17 | 1552 | string = Ferror_message_string (data); |
583f48b9 | 1553 | fatal ("%s", SDATA (string)); |
db9f0278 JB |
1554 | } |
1555 | ||
734d55a2 KS |
1556 | /* Internal version of Fsignal that never returns. |
1557 | Used for anything but Qquit (which can return from Fsignal). */ | |
1558 | ||
1559 | void | |
d3da34e0 | 1560 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1561 | { |
1562 | Fsignal (error_symbol, data); | |
1088b922 | 1563 | emacs_abort (); |
734d55a2 KS |
1564 | } |
1565 | ||
1566 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1567 | ||
1568 | void | |
d3da34e0 | 1569 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1570 | { |
1571 | xsignal (error_symbol, Qnil); | |
1572 | } | |
1573 | ||
1574 | void | |
d3da34e0 | 1575 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1576 | { |
1577 | xsignal (error_symbol, list1 (arg)); | |
1578 | } | |
1579 | ||
1580 | void | |
d3da34e0 | 1581 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1582 | { |
1583 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1584 | } | |
1585 | ||
1586 | void | |
d3da34e0 | 1587 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1588 | { |
1589 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1590 | } | |
1591 | ||
1592 | /* Signal `error' with message S, and additional arg ARG. | |
1593 | If ARG is not a genuine list, make it a one-element list. */ | |
1594 | ||
1595 | void | |
a8fe7202 | 1596 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1597 | { |
1598 | Lisp_Object tortoise, hare; | |
1599 | ||
1600 | hare = tortoise = arg; | |
1601 | while (CONSP (hare)) | |
1602 | { | |
1603 | hare = XCDR (hare); | |
1604 | if (!CONSP (hare)) | |
1605 | break; | |
1606 | ||
1607 | hare = XCDR (hare); | |
1608 | tortoise = XCDR (tortoise); | |
1609 | ||
1610 | if (EQ (hare, tortoise)) | |
1611 | break; | |
1612 | } | |
1613 | ||
1614 | if (!NILP (hare)) | |
6c6f1994 | 1615 | arg = list1 (arg); |
734d55a2 KS |
1616 | |
1617 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1618 | } | |
1619 | ||
1620 | ||
1882aa38 | 1621 | /* Return true if LIST is a non-nil atom or |
128c0f66 RM |
1622 | a list containing one of CONDITIONS. */ |
1623 | ||
1882aa38 | 1624 | static bool |
d3da34e0 | 1625 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1626 | { |
4de86b16 | 1627 | if (NILP (list)) |
128c0f66 RM |
1628 | return 0; |
1629 | if (! CONSP (list)) | |
1630 | return 1; | |
1631 | ||
ab67260b | 1632 | while (CONSP (conditions)) |
128c0f66 | 1633 | { |
ab67260b | 1634 | Lisp_Object this, tail; |
03699b14 KR |
1635 | this = XCAR (conditions); |
1636 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1637 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1638 | return 1; |
03699b14 | 1639 | conditions = XCDR (conditions); |
128c0f66 | 1640 | } |
ab67260b | 1641 | return 0; |
128c0f66 RM |
1642 | } |
1643 | ||
1882aa38 | 1644 | /* Return true if an error with condition-symbols CONDITIONS, |
fc950e09 | 1645 | and described by SIGNAL-DATA, should skip the debugger |
1b1acc13 | 1646 | according to debugger-ignored-errors. */ |
fc950e09 | 1647 | |
1882aa38 | 1648 | static bool |
d3da34e0 | 1649 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1650 | { |
1651 | Lisp_Object tail; | |
1882aa38 | 1652 | bool first_string = 1; |
fc950e09 KH |
1653 | Lisp_Object error_message; |
1654 | ||
17401c97 GM |
1655 | error_message = Qnil; |
1656 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1657 | { |
03699b14 | 1658 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1659 | { |
1660 | if (first_string) | |
1661 | { | |
1662 | error_message = Ferror_message_string (data); | |
1663 | first_string = 0; | |
1664 | } | |
177c0ea7 | 1665 | |
03699b14 | 1666 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1667 | return 1; |
1668 | } | |
1669 | else | |
1670 | { | |
1671 | Lisp_Object contail; | |
1672 | ||
17401c97 | 1673 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1674 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1675 | return 1; |
1676 | } | |
1677 | } | |
1678 | ||
1679 | return 0; | |
1680 | } | |
1681 | ||
ddaa36e1 | 1682 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
7d47b580 JB |
1683 | SIG and DATA describe the signal. There are two ways to pass them: |
1684 | = SIG is the error symbol, and DATA is the rest of the data. | |
1685 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). | |
1686 | This is for memory-full errors only. */ | |
1882aa38 | 1687 | static bool |
d3da34e0 | 1688 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1689 | { |
1690 | Lisp_Object combined_data; | |
1691 | ||
1692 | combined_data = Fcons (sig, data); | |
1693 | ||
1694 | if ( | |
1695 | /* Don't try to run the debugger with interrupts blocked. | |
1696 | The editing loop would return anyway. */ | |
4d7e6e51 | 1697 | ! input_blocked_p () |
45b82ad0 | 1698 | && NILP (Vinhibit_debugger) |
ddaa36e1 AS |
1699 | /* Does user want to enter debugger for this kind of error? */ |
1700 | && (EQ (sig, Qquit) | |
1701 | ? debug_on_quit | |
1702 | : wants_debugger (Vdebug_on_error, conditions)) | |
1703 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1704 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1705 | && when_entered_debugger < num_nonmacro_input_events) |
1706 | { | |
6c6f1994 | 1707 | call_debugger (list2 (Qerror, combined_data)); |
ddaa36e1 AS |
1708 | return 1; |
1709 | } | |
1710 | ||
1711 | return 0; | |
1712 | } | |
1713 | ||
db9f0278 | 1714 | static Lisp_Object |
7d47b580 | 1715 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions) |
db9f0278 JB |
1716 | { |
1717 | register Lisp_Object h; | |
db9f0278 | 1718 | |
f01cbfdd RS |
1719 | /* t is used by handlers for all conditions, set up by C code. */ |
1720 | if (EQ (handlers, Qt)) | |
db9f0278 | 1721 | return Qt; |
f01cbfdd | 1722 | |
61ede770 RS |
1723 | /* error is used similarly, but means print an error message |
1724 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1725 | if (EQ (handlers, Qerror)) |
1726 | return Qt; | |
f01cbfdd | 1727 | |
e7f7fbaa | 1728 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1729 | { |
e7f7fbaa SM |
1730 | Lisp_Object handler = XCAR (h); |
1731 | Lisp_Object condit, tem; | |
5f96776a | 1732 | |
5f96776a | 1733 | if (!CONSP (handler)) |
db9f0278 | 1734 | continue; |
e7f7fbaa | 1735 | condit = XCAR (handler); |
5f96776a RS |
1736 | /* Handle a single condition name in handler HANDLER. */ |
1737 | if (SYMBOLP (condit)) | |
1738 | { | |
1739 | tem = Fmemq (Fcar (handler), conditions); | |
1740 | if (!NILP (tem)) | |
1741 | return handler; | |
1742 | } | |
1743 | /* Handle a list of condition names in handler HANDLER. */ | |
1744 | else if (CONSP (condit)) | |
1745 | { | |
f01cbfdd RS |
1746 | Lisp_Object tail; |
1747 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1748 | { |
e7f7fbaa | 1749 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1750 | if (!NILP (tem)) |
e7f7fbaa | 1751 | return handler; |
5f96776a RS |
1752 | } |
1753 | } | |
db9f0278 | 1754 | } |
f01cbfdd | 1755 | |
db9f0278 JB |
1756 | return Qnil; |
1757 | } | |
1758 | ||
db9f0278 | 1759 | |
f6d62986 | 1760 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1761 | void |
b3ffc17c | 1762 | verror (const char *m, va_list ap) |
db9f0278 | 1763 | { |
70476b54 | 1764 | char buf[4000]; |
c2d1e36d PE |
1765 | ptrdiff_t size = sizeof buf; |
1766 | ptrdiff_t size_max = STRING_BYTES_BOUND + 1; | |
9125da08 | 1767 | char *buffer = buf; |
c2d1e36d | 1768 | ptrdiff_t used; |
9125da08 RS |
1769 | Lisp_Object string; |
1770 | ||
d749b01b | 1771 | used = evxprintf (&buffer, &size, buf, size_max, m, ap); |
5fdb398c | 1772 | string = make_string (buffer, used); |
eb3f1cc8 | 1773 | if (buffer != buf) |
9ae6734f | 1774 | xfree (buffer); |
9125da08 | 1775 | |
734d55a2 | 1776 | xsignal1 (Qerror, string); |
db9f0278 | 1777 | } |
b3ffc17c DN |
1778 | |
1779 | ||
f6d62986 | 1780 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
1781 | |
1782 | /* VARARGS 1 */ | |
1783 | void | |
1784 | error (const char *m, ...) | |
1785 | { | |
1786 | va_list ap; | |
1787 | va_start (ap, m); | |
1788 | verror (m, ap); | |
b3ffc17c | 1789 | } |
db9f0278 | 1790 | \f |
a7ca3326 | 1791 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
1792 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
1793 | This means it contains a description for how to read arguments to give it. | |
1794 | The value is nil for an invalid function or a symbol with no function | |
1795 | definition. | |
1796 | ||
1797 | Interactively callable functions include strings and vectors (treated | |
1798 | as keyboard macros), lambda-expressions that contain a top-level call | |
1799 | to `interactive', autoload definitions made by `autoload' with non-nil | |
1800 | fourth argument, and some of the built-in functions of Lisp. | |
1801 | ||
e72706be RS |
1802 | Also, a symbol satisfies `commandp' if its function definition does so. |
1803 | ||
1804 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 1805 | then strings and vectors are not accepted. */) |
5842a27b | 1806 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
1807 | { |
1808 | register Lisp_Object fun; | |
1809 | register Lisp_Object funcar; | |
52b71f49 | 1810 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
1811 | |
1812 | fun = function; | |
1813 | ||
eadf1faa SM |
1814 | fun = indirect_function (fun); /* Check cycles. */ |
1815 | if (NILP (fun)) | |
ffd56f97 | 1816 | return Qnil; |
db9f0278 | 1817 | |
52b71f49 | 1818 | /* Check an `interactive-form' property if present, analogous to the |
eadf1faa | 1819 | function-documentation property. */ |
52b71f49 SM |
1820 | fun = function; |
1821 | while (SYMBOLP (fun)) | |
1822 | { | |
2b9aa051 | 1823 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
1824 | if (!NILP (tmp)) |
1825 | if_prop = Qt; | |
1826 | fun = Fsymbol_function (fun); | |
1827 | } | |
1828 | ||
db9f0278 JB |
1829 | /* Emacs primitives are interactive if their DEFUN specifies an |
1830 | interactive spec. */ | |
90165123 | 1831 | if (SUBRP (fun)) |
04724b69 | 1832 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
1833 | |
1834 | /* Bytecode objects are interactive if they are long enough to | |
1835 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1836 | where the interactive spec is stored. */ | |
90165123 | 1837 | else if (COMPILEDP (fun)) |
845975f5 | 1838 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 1839 | ? Qt : if_prop); |
db9f0278 JB |
1840 | |
1841 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 1842 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 1843 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
1844 | |
1845 | /* Lists may represent commands. */ | |
1846 | if (!CONSP (fun)) | |
1847 | return Qnil; | |
ed16fb98 | 1848 | funcar = XCAR (fun); |
b38b1ec0 | 1849 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
1850 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
1851 | ? Qt : if_prop); | |
23aba0ea | 1852 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 1853 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 1854 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 1855 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
1856 | else |
1857 | return Qnil; | |
1858 | } | |
1859 | ||
db9f0278 | 1860 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
1861 | doc: /* Define FUNCTION to autoload from FILE. |
1862 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
1863 | Third arg DOCSTRING is documentation for the function. | |
1864 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
1865 | Fifth arg TYPE indicates the type of the object: | |
1866 | nil or omitted says FUNCTION is a function, | |
1867 | `keymap' says FUNCTION is really a keymap, and | |
1868 | `macro' or t says FUNCTION is really a macro. | |
1869 | Third through fifth args give info about the real definition. | |
1870 | They default to nil. | |
1871 | If FUNCTION is already defined other than as an autoload, | |
1872 | this does nothing and returns nil. */) | |
5842a27b | 1873 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 1874 | { |
b7826503 PJ |
1875 | CHECK_SYMBOL (function); |
1876 | CHECK_STRING (file); | |
db9f0278 | 1877 | |
f6d62986 | 1878 | /* If function is defined and not as an autoload, don't override. */ |
eadf1faa | 1879 | if (!NILP (XSYMBOL (function)->function) |
32e5c58c | 1880 | && !AUTOLOADP (XSYMBOL (function)->function)) |
db9f0278 JB |
1881 | return Qnil; |
1882 | ||
32e5c58c | 1883 | if (!NILP (Vpurify_flag) && EQ (docstring, make_number (0))) |
61b108cc SM |
1884 | /* `read1' in lread.c has found the docstring starting with "\ |
1885 | and assumed the docstring will be provided by Snarf-documentation, so it | |
1886 | passed us 0 instead. But that leads to accidental sharing in purecopy's | |
1887 | hash-consing, so we use a (hopefully) unique integer instead. */ | |
32e5c58c SM |
1888 | docstring = make_number (XHASH (function)); |
1889 | return Fdefalias (function, | |
1890 | list5 (Qautoload, file, docstring, interactive, type), | |
1891 | Qnil); | |
db9f0278 JB |
1892 | } |
1893 | ||
27e498e6 | 1894 | void |
d3da34e0 | 1895 | un_autoload (Lisp_Object oldqueue) |
db9f0278 | 1896 | { |
27e498e6 | 1897 | Lisp_Object queue, first, second; |
db9f0278 JB |
1898 | |
1899 | /* Queue to unwind is current value of Vautoload_queue. | |
1900 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1901 | queue = Vautoload_queue; | |
1902 | Vautoload_queue = oldqueue; | |
1903 | while (CONSP (queue)) | |
1904 | { | |
e509f168 | 1905 | first = XCAR (queue); |
db9f0278 JB |
1906 | second = Fcdr (first); |
1907 | first = Fcar (first); | |
47b82df9 RS |
1908 | if (EQ (first, make_number (0))) |
1909 | Vfeatures = second; | |
db9f0278 JB |
1910 | else |
1911 | Ffset (first, second); | |
e509f168 | 1912 | queue = XCDR (queue); |
db9f0278 | 1913 | } |
db9f0278 JB |
1914 | } |
1915 | ||
ca20916b RS |
1916 | /* Load an autoloaded function. |
1917 | FUNNAME is the symbol which is the function's name. | |
1918 | FUNDEF is the autoload definition (a list). */ | |
1919 | ||
7abaf5cc SM |
1920 | DEFUN ("autoload-do-load", Fautoload_do_load, Sautoload_do_load, 1, 3, 0, |
1921 | doc: /* Load FUNDEF which should be an autoload. | |
1922 | If non-nil, FUNNAME should be the symbol whose function value is FUNDEF, | |
1923 | in which case the function returns the new autoloaded function value. | |
1924 | If equal to `macro', MACRO-ONLY specifies that FUNDEF should only be loaded if | |
1925 | it is defines a macro. */) | |
1926 | (Lisp_Object fundef, Lisp_Object funname, Lisp_Object macro_only) | |
db9f0278 | 1927 | { |
d311d28c | 1928 | ptrdiff_t count = SPECPDL_INDEX (); |
ca20916b | 1929 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 1930 | |
7abaf5cc SM |
1931 | if (!CONSP (fundef) || !EQ (Qautoload, XCAR (fundef))) |
1932 | return fundef; | |
1933 | ||
1934 | if (EQ (macro_only, Qmacro)) | |
1935 | { | |
1936 | Lisp_Object kind = Fnth (make_number (4), fundef); | |
1937 | if (! (EQ (kind, Qt) || EQ (kind, Qmacro))) | |
1938 | return fundef; | |
1939 | } | |
1940 | ||
aea6173f RS |
1941 | /* This is to make sure that loadup.el gives a clear picture |
1942 | of what files are preloaded and when. */ | |
ab4db096 RS |
1943 | if (! NILP (Vpurify_flag)) |
1944 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 1945 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 1946 | |
b7826503 | 1947 | CHECK_SYMBOL (funname); |
7abaf5cc | 1948 | GCPRO3 (funname, fundef, macro_only); |
db9f0278 | 1949 | |
f87740dc | 1950 | /* Preserve the match data. */ |
89f2614d | 1951 | record_unwind_save_match_data (); |
177c0ea7 | 1952 | |
a04ee161 RS |
1953 | /* If autoloading gets an error (which includes the error of failing |
1954 | to define the function being called), we use Vautoload_queue | |
1955 | to undo function definitions and `provide' calls made by | |
1956 | the function. We do this in the specific case of autoloading | |
1957 | because autoloading is not an explicit request "load this file", | |
1958 | but rather a request to "call this function". | |
d3da34e0 | 1959 | |
a04ee161 | 1960 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
1961 | record_unwind_protect (un_autoload, Vautoload_queue); |
1962 | Vautoload_queue = Qt; | |
7abaf5cc SM |
1963 | /* If `macro_only', assume this autoload to be a "best-effort", |
1964 | so don't signal an error if autoloading fails. */ | |
1965 | Fload (Fcar (Fcdr (fundef)), macro_only, Qt, Qnil, Qt); | |
2a49b6e5 | 1966 | |
db9f0278 JB |
1967 | /* Once loading finishes, don't undo it. */ |
1968 | Vautoload_queue = Qt; | |
1969 | unbind_to (count, Qnil); | |
1970 | ||
ca20916b | 1971 | UNGCPRO; |
7abaf5cc SM |
1972 | |
1973 | if (NILP (funname)) | |
1974 | return Qnil; | |
1975 | else | |
1976 | { | |
1977 | Lisp_Object fun = Findirect_function (funname, Qnil); | |
1978 | ||
1979 | if (!NILP (Fequal (fun, fundef))) | |
1980 | error ("Autoloading failed to define function %s", | |
1981 | SDATA (SYMBOL_NAME (funname))); | |
1982 | else | |
1983 | return fun; | |
1984 | } | |
db9f0278 | 1985 | } |
4c576a83 | 1986 | |
db9f0278 | 1987 | \f |
a7ca3326 | 1988 | DEFUN ("eval", Feval, Seval, 1, 2, 0, |
a0ee6f27 SM |
1989 | doc: /* Evaluate FORM and return its value. |
1990 | If LEXICAL is t, evaluate using lexical scoping. */) | |
1991 | (Lisp_Object form, Lisp_Object lexical) | |
defb1411 | 1992 | { |
d311d28c | 1993 | ptrdiff_t count = SPECPDL_INDEX (); |
a0ee6f27 | 1994 | specbind (Qinternal_interpreter_environment, |
6c6f1994 | 1995 | CONSP (lexical) || NILP (lexical) ? lexical : list1 (Qt)); |
defb1411 SM |
1996 | return unbind_to (count, eval_sub (form)); |
1997 | } | |
1998 | ||
5e301d76 PE |
1999 | /* Grow the specpdl stack by one entry. |
2000 | The caller should have already initialized the entry. | |
2001 | Signal an error on stack overflow. | |
2002 | ||
2003 | Make sure that there is always one unused entry past the top of the | |
2004 | stack, so that the just-initialized entry is safely unwound if | |
2005 | memory exhausted and an error is signaled here. Also, allocate a | |
2006 | never-used entry just before the bottom of the stack; sometimes its | |
2007 | address is taken. */ | |
2008 | ||
2f592f95 SM |
2009 | static void |
2010 | grow_specpdl (void) | |
2011 | { | |
5e301d76 PE |
2012 | specpdl_ptr++; |
2013 | ||
2014 | if (specpdl_ptr == specpdl + specpdl_size) | |
2f592f95 | 2015 | { |
5e301d76 PE |
2016 | ptrdiff_t count = SPECPDL_INDEX (); |
2017 | ptrdiff_t max_size = min (max_specpdl_size, PTRDIFF_MAX - 1000); | |
2018 | union specbinding *pdlvec = specpdl - 1; | |
2019 | ptrdiff_t pdlvecsize = specpdl_size + 1; | |
2f592f95 | 2020 | if (max_size <= specpdl_size) |
5e301d76 PE |
2021 | { |
2022 | if (max_specpdl_size < 400) | |
2023 | max_size = max_specpdl_size = 400; | |
2024 | if (max_size <= specpdl_size) | |
2025 | signal_error ("Variable binding depth exceeds max-specpdl-size", | |
2026 | Qnil); | |
2027 | } | |
2028 | pdlvec = xpalloc (pdlvec, &pdlvecsize, 1, max_size + 1, sizeof *specpdl); | |
2029 | specpdl = pdlvec + 1; | |
2030 | specpdl_size = pdlvecsize - 1; | |
2031 | specpdl_ptr = specpdl + count; | |
2f592f95 | 2032 | } |
2f592f95 SM |
2033 | } |
2034 | ||
3d5ee10a | 2035 | void |
2f592f95 SM |
2036 | record_in_backtrace (Lisp_Object function, Lisp_Object *args, ptrdiff_t nargs) |
2037 | { | |
2038 | eassert (nargs >= UNEVALLED); | |
9349e5f7 PE |
2039 | specpdl_ptr->bt.kind = SPECPDL_BACKTRACE; |
2040 | specpdl_ptr->bt.debug_on_exit = false; | |
2041 | specpdl_ptr->bt.function = function; | |
2042 | specpdl_ptr->bt.args = args; | |
2043 | specpdl_ptr->bt.nargs = nargs; | |
5e301d76 | 2044 | grow_specpdl (); |
2f592f95 SM |
2045 | } |
2046 | ||
defb1411 SM |
2047 | /* Eval a sub-expression of the current expression (i.e. in the same |
2048 | lexical scope). */ | |
2049 | Lisp_Object | |
2050 | eval_sub (Lisp_Object form) | |
db9f0278 JB |
2051 | { |
2052 | Lisp_Object fun, val, original_fun, original_args; | |
2053 | Lisp_Object funcar; | |
db9f0278 JB |
2054 | struct gcpro gcpro1, gcpro2, gcpro3; |
2055 | ||
90165123 | 2056 | if (SYMBOLP (form)) |
b9598260 | 2057 | { |
f07a954e SM |
2058 | /* Look up its binding in the lexical environment. |
2059 | We do not pay attention to the declared_special flag here, since we | |
2060 | already did that when let-binding the variable. */ | |
2061 | Lisp_Object lex_binding | |
2062 | = !NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
2063 | ? Fassq (form, Vinternal_interpreter_environment) | |
2064 | : Qnil; | |
2065 | if (CONSP (lex_binding)) | |
2066 | return XCDR (lex_binding); | |
2067 | else | |
2068 | return Fsymbol_value (form); | |
b9598260 SM |
2069 | } |
2070 | ||
db9f0278 JB |
2071 | if (!CONSP (form)) |
2072 | return form; | |
2073 | ||
2074 | QUIT; | |
9d5a1260 DA |
2075 | |
2076 | GCPRO1 (form); | |
765e61e3 | 2077 | maybe_gc (); |
9d5a1260 | 2078 | UNGCPRO; |
db9f0278 JB |
2079 | |
2080 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2081 | { | |
2082 | if (max_lisp_eval_depth < 100) | |
2083 | max_lisp_eval_depth = 100; | |
2084 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2085 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2086 | } |
2087 | ||
7d7bbefd DA |
2088 | original_fun = XCAR (form); |
2089 | original_args = XCDR (form); | |
db9f0278 | 2090 | |
2f592f95 SM |
2091 | /* This also protects them from gc. */ |
2092 | record_in_backtrace (original_fun, &original_args, UNEVALLED); | |
db9f0278 JB |
2093 | |
2094 | if (debug_on_next_call) | |
2095 | do_debug_on_call (Qt); | |
2096 | ||
2097 | /* At this point, only original_fun and original_args | |
f6d62986 | 2098 | have values that will be used below. */ |
db9f0278 | 2099 | retry: |
8788120f KS |
2100 | |
2101 | /* Optimize for no indirection. */ | |
2102 | fun = original_fun; | |
eadf1faa | 2103 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2104 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2105 | fun = indirect_function (fun); |
db9f0278 | 2106 | |
90165123 | 2107 | if (SUBRP (fun)) |
db9f0278 JB |
2108 | { |
2109 | Lisp_Object numargs; | |
166c822d | 2110 | Lisp_Object argvals[8]; |
db9f0278 JB |
2111 | Lisp_Object args_left; |
2112 | register int i, maxargs; | |
2113 | ||
2114 | args_left = original_args; | |
2115 | numargs = Flength (args_left); | |
2116 | ||
7e63e0c3 | 2117 | check_cons_list (); |
c1788fbc | 2118 | |
f6d62986 SM |
2119 | if (XINT (numargs) < XSUBR (fun)->min_args |
2120 | || (XSUBR (fun)->max_args >= 0 | |
2121 | && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2122 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2123 | |
ef1b0ba7 | 2124 | else if (XSUBR (fun)->max_args == UNEVALLED) |
bbc6b304 | 2125 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
ef1b0ba7 | 2126 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 | 2127 | { |
f6d62986 | 2128 | /* Pass a vector of evaluated arguments. */ |
db9f0278 | 2129 | Lisp_Object *vals; |
f66c7cf8 | 2130 | ptrdiff_t argnum = 0; |
3a7a9129 | 2131 | USE_SAFE_ALLOCA; |
db9f0278 | 2132 | |
b72e0717 | 2133 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2134 | |
2135 | GCPRO3 (args_left, fun, fun); | |
2136 | gcpro3.var = vals; | |
2137 | gcpro3.nvars = 0; | |
2138 | ||
265a9e55 | 2139 | while (!NILP (args_left)) |
db9f0278 | 2140 | { |
defb1411 | 2141 | vals[argnum++] = eval_sub (Fcar (args_left)); |
db9f0278 JB |
2142 | args_left = Fcdr (args_left); |
2143 | gcpro3.nvars = argnum; | |
2144 | } | |
db9f0278 | 2145 | |
2f592f95 SM |
2146 | set_backtrace_args (specpdl_ptr - 1, vals); |
2147 | set_backtrace_nargs (specpdl_ptr - 1, XINT (numargs)); | |
db9f0278 | 2148 | |
d5273788 | 2149 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2150 | UNGCPRO; |
3a7a9129 | 2151 | SAFE_FREE (); |
db9f0278 | 2152 | } |
ef1b0ba7 | 2153 | else |
db9f0278 | 2154 | { |
ef1b0ba7 SM |
2155 | GCPRO3 (args_left, fun, fun); |
2156 | gcpro3.var = argvals; | |
2157 | gcpro3.nvars = 0; | |
db9f0278 | 2158 | |
ef1b0ba7 SM |
2159 | maxargs = XSUBR (fun)->max_args; |
2160 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2161 | { | |
a0ee6f27 | 2162 | argvals[i] = eval_sub (Fcar (args_left)); |
ef1b0ba7 SM |
2163 | gcpro3.nvars = ++i; |
2164 | } | |
db9f0278 | 2165 | |
ef1b0ba7 | 2166 | UNGCPRO; |
db9f0278 | 2167 | |
2f592f95 SM |
2168 | set_backtrace_args (specpdl_ptr - 1, argvals); |
2169 | set_backtrace_nargs (specpdl_ptr - 1, XINT (numargs)); | |
ef1b0ba7 SM |
2170 | |
2171 | switch (i) | |
2172 | { | |
2173 | case 0: | |
2174 | val = (XSUBR (fun)->function.a0 ()); | |
2175 | break; | |
2176 | case 1: | |
2177 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2178 | break; | |
2179 | case 2: | |
2180 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2181 | break; | |
2182 | case 3: | |
2183 | val = (XSUBR (fun)->function.a3 | |
2184 | (argvals[0], argvals[1], argvals[2])); | |
2185 | break; | |
2186 | case 4: | |
2187 | val = (XSUBR (fun)->function.a4 | |
2188 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2189 | break; | |
2190 | case 5: | |
2191 | val = (XSUBR (fun)->function.a5 | |
2192 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2193 | argvals[4])); | |
2194 | break; | |
2195 | case 6: | |
2196 | val = (XSUBR (fun)->function.a6 | |
2197 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2198 | argvals[4], argvals[5])); | |
2199 | break; | |
2200 | case 7: | |
2201 | val = (XSUBR (fun)->function.a7 | |
2202 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2203 | argvals[4], argvals[5], argvals[6])); | |
2204 | break; | |
2205 | ||
2206 | case 8: | |
2207 | val = (XSUBR (fun)->function.a8 | |
2208 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2209 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2210 | break; | |
2211 | ||
2212 | default: | |
2213 | /* Someone has created a subr that takes more arguments than | |
2214 | is supported by this code. We need to either rewrite the | |
2215 | subr to use a different argument protocol, or add more | |
2216 | cases to this switch. */ | |
1088b922 | 2217 | emacs_abort (); |
ef1b0ba7 | 2218 | } |
db9f0278 JB |
2219 | } |
2220 | } | |
ef1b0ba7 | 2221 | else if (COMPILEDP (fun)) |
defb1411 | 2222 | val = apply_lambda (fun, original_args); |
db9f0278 JB |
2223 | else |
2224 | { | |
eadf1faa | 2225 | if (NILP (fun)) |
734d55a2 | 2226 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2227 | if (!CONSP (fun)) |
734d55a2 KS |
2228 | xsignal1 (Qinvalid_function, original_fun); |
2229 | funcar = XCAR (fun); | |
90165123 | 2230 | if (!SYMBOLP (funcar)) |
734d55a2 | 2231 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2232 | if (EQ (funcar, Qautoload)) |
2233 | { | |
7abaf5cc | 2234 | Fautoload_do_load (fun, original_fun, Qnil); |
db9f0278 JB |
2235 | goto retry; |
2236 | } | |
2237 | if (EQ (funcar, Qmacro)) | |
8be3a09c SM |
2238 | { |
2239 | ptrdiff_t count = SPECPDL_INDEX (); | |
8be3a09c SM |
2240 | Lisp_Object exp; |
2241 | /* Bind lexical-binding during expansion of the macro, so the | |
2242 | macro can know reliably if the code it outputs will be | |
2243 | interpreted using lexical-binding or not. */ | |
2244 | specbind (Qlexical_binding, | |
2245 | NILP (Vinternal_interpreter_environment) ? Qnil : Qt); | |
2246 | exp = apply1 (Fcdr (fun), original_args); | |
2247 | unbind_to (count, Qnil); | |
2248 | val = eval_sub (exp); | |
2249 | } | |
defb1411 SM |
2250 | else if (EQ (funcar, Qlambda) |
2251 | || EQ (funcar, Qclosure)) | |
2252 | val = apply_lambda (fun, original_args); | |
db9f0278 | 2253 | else |
734d55a2 | 2254 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2255 | } |
7e63e0c3 | 2256 | check_cons_list (); |
c1788fbc | 2257 | |
db9f0278 | 2258 | lisp_eval_depth--; |
2f592f95 | 2259 | if (backtrace_debug_on_exit (specpdl_ptr - 1)) |
6c6f1994 | 2260 | val = call_debugger (list2 (Qexit, val)); |
2f592f95 | 2261 | specpdl_ptr--; |
824eb35e | 2262 | |
db9f0278 JB |
2263 | return val; |
2264 | } | |
2265 | \f | |
8edd4a2b | 2266 | DEFUN ("apply", Fapply, Sapply, 1, MANY, 0, |
9dbc9081 PJ |
2267 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2268 | Then return the value FUNCTION returns. | |
2269 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2270 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2271 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2272 | { |
d311d28c PE |
2273 | ptrdiff_t i; |
2274 | EMACS_INT numargs; | |
db9f0278 JB |
2275 | register Lisp_Object spread_arg; |
2276 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2277 | Lisp_Object fun, retval; |
96d44c64 | 2278 | struct gcpro gcpro1; |
3a7a9129 | 2279 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2280 | |
2281 | fun = args [0]; | |
2282 | funcall_args = 0; | |
2283 | spread_arg = args [nargs - 1]; | |
b7826503 | 2284 | CHECK_LIST (spread_arg); |
177c0ea7 | 2285 | |
db9f0278 JB |
2286 | numargs = XINT (Flength (spread_arg)); |
2287 | ||
2288 | if (numargs == 0) | |
2289 | return Ffuncall (nargs - 1, args); | |
2290 | else if (numargs == 1) | |
2291 | { | |
03699b14 | 2292 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2293 | return Ffuncall (nargs, args); |
2294 | } | |
2295 | ||
a6e3fa71 | 2296 | numargs += nargs - 2; |
db9f0278 | 2297 | |
8788120f | 2298 | /* Optimize for no indirection. */ |
eadf1faa | 2299 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2300 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2301 | fun = indirect_function (fun); |
eadf1faa | 2302 | if (NILP (fun)) |
db9f0278 | 2303 | { |
f6d62986 | 2304 | /* Let funcall get the error. */ |
ffd56f97 JB |
2305 | fun = args[0]; |
2306 | goto funcall; | |
db9f0278 JB |
2307 | } |
2308 | ||
90165123 | 2309 | if (SUBRP (fun)) |
db9f0278 JB |
2310 | { |
2311 | if (numargs < XSUBR (fun)->min_args | |
2312 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
f6d62986 | 2313 | goto funcall; /* Let funcall get the error. */ |
c5101a77 | 2314 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2315 | { |
2316 | /* Avoid making funcall cons up a yet another new vector of arguments | |
f6d62986 | 2317 | by explicitly supplying nil's for optional values. */ |
b72e0717 | 2318 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2319 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2320 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2321 | GCPRO1 (*funcall_args); |
2322 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2323 | } |
2324 | } | |
2325 | funcall: | |
2326 | /* We add 1 to numargs because funcall_args includes the | |
2327 | function itself as well as its arguments. */ | |
2328 | if (!funcall_args) | |
a6e3fa71 | 2329 | { |
b72e0717 | 2330 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2331 | GCPRO1 (*funcall_args); |
2332 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2333 | } |
2334 | ||
663e2b3f | 2335 | memcpy (funcall_args, args, nargs * word_size); |
db9f0278 JB |
2336 | /* Spread the last arg we got. Its first element goes in |
2337 | the slot that it used to occupy, hence this value of I. */ | |
2338 | i = nargs - 1; | |
265a9e55 | 2339 | while (!NILP (spread_arg)) |
db9f0278 | 2340 | { |
03699b14 KR |
2341 | funcall_args [i++] = XCAR (spread_arg); |
2342 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2343 | } |
a6e3fa71 | 2344 | |
96d44c64 | 2345 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2346 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2347 | UNGCPRO; | |
2348 | SAFE_FREE (); | |
2349 | ||
2350 | return retval; | |
db9f0278 JB |
2351 | } |
2352 | \f | |
ff936e53 SM |
2353 | /* Run hook variables in various ways. */ |
2354 | ||
f6d62986 | 2355 | static Lisp_Object |
f66c7cf8 | 2356 | funcall_nil (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2357 | { |
2358 | Ffuncall (nargs, args); | |
2359 | return Qnil; | |
2360 | } | |
ff936e53 | 2361 | |
a7ca3326 | 2362 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2363 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2364 | Each argument should be a symbol, a hook variable. |
2365 | These symbols are processed in the order specified. | |
2366 | If a hook symbol has a non-nil value, that value may be a function | |
2367 | or a list of functions to be called to run the hook. | |
2368 | If the value is a function, it is called with no arguments. | |
2369 | If it is a list, the elements are called, in order, with no arguments. | |
2370 | ||
9f685258 LK |
2371 | Major modes should not use this function directly to run their mode |
2372 | hook; they should use `run-mode-hooks' instead. | |
2373 | ||
72e85d5d RS |
2374 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2375 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2376 | usage: (run-hooks &rest HOOKS) */) |
f66c7cf8 | 2377 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 SM |
2378 | { |
2379 | Lisp_Object hook[1]; | |
f66c7cf8 | 2380 | ptrdiff_t i; |
ff936e53 SM |
2381 | |
2382 | for (i = 0; i < nargs; i++) | |
2383 | { | |
2384 | hook[0] = args[i]; | |
f6d62986 | 2385 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
2386 | } |
2387 | ||
2388 | return Qnil; | |
2389 | } | |
177c0ea7 | 2390 | |
a7ca3326 | 2391 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2392 | Srun_hook_with_args, 1, MANY, 0, |
2393 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2394 | HOOK should be a symbol, a hook variable. The value of HOOK |
2395 | may be nil, a function, or a list of functions. Call each | |
2396 | function in order with arguments ARGS. The final return value | |
2397 | is unspecified. | |
9dbc9081 | 2398 | |
72e85d5d RS |
2399 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2400 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2401 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
f66c7cf8 | 2402 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2403 | { |
f6d62986 | 2404 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
2405 | } |
2406 | ||
d393cefb GM |
2407 | /* NB this one still documents a specific non-nil return value. |
2408 | (As did run-hook-with-args and run-hook-with-args-until-failure | |
2409 | until they were changed in 24.1.) */ | |
a0d76c27 | 2410 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2411 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2412 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2413 | HOOK should be a symbol, a hook variable. The value of HOOK |
2414 | may be nil, a function, or a list of functions. Call each | |
2415 | function in order with arguments ARGS, stopping at the first | |
2416 | one that returns non-nil, and return that value. Otherwise (if | |
2417 | all functions return nil, or if there are no functions to call), | |
2418 | return nil. | |
9dbc9081 | 2419 | |
72e85d5d RS |
2420 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2421 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2422 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
f66c7cf8 | 2423 | (ptrdiff_t nargs, Lisp_Object *args) |
b0b667cb | 2424 | { |
f6d62986 SM |
2425 | return run_hook_with_args (nargs, args, Ffuncall); |
2426 | } | |
2427 | ||
2428 | static Lisp_Object | |
f66c7cf8 | 2429 | funcall_not (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2430 | { |
2431 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
2432 | } |
2433 | ||
a7ca3326 | 2434 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2435 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2436 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2437 | HOOK should be a symbol, a hook variable. The value of HOOK |
2438 | may be nil, a function, or a list of functions. Call each | |
2439 | function in order with arguments ARGS, stopping at the first | |
2440 | one that returns nil, and return nil. Otherwise (if all functions | |
2441 | return non-nil, or if there are no functions to call), return non-nil | |
2442 | \(do not rely on the precise return value in this case). | |
9dbc9081 | 2443 | |
72e85d5d RS |
2444 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2445 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2446 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
f66c7cf8 | 2447 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2448 | { |
f6d62986 | 2449 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
2450 | } |
2451 | ||
f6d62986 | 2452 | static Lisp_Object |
f66c7cf8 | 2453 | run_hook_wrapped_funcall (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2454 | { |
2455 | Lisp_Object tmp = args[0], ret; | |
2456 | args[0] = args[1]; | |
2457 | args[1] = tmp; | |
2458 | ret = Ffuncall (nargs, args); | |
2459 | args[1] = args[0]; | |
2460 | args[0] = tmp; | |
2461 | return ret; | |
2462 | } | |
2463 | ||
2464 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
2465 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
2466 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
2467 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
2468 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
2469 | aborts and returns that value. | |
2470 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
f66c7cf8 | 2471 | (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2472 | { |
2473 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
2474 | } | |
ff936e53 | 2475 | |
c933ea05 RS |
2476 | /* ARGS[0] should be a hook symbol. |
2477 | Call each of the functions in the hook value, passing each of them | |
2478 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 2479 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
2480 | The caller (or its caller, etc) must gcpro all of ARGS, |
2481 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2482 | ||
f6d62986 | 2483 | Lisp_Object |
f66c7cf8 PE |
2484 | run_hook_with_args (ptrdiff_t nargs, Lisp_Object *args, |
2485 | Lisp_Object (*funcall) (ptrdiff_t nargs, Lisp_Object *args)) | |
ff936e53 | 2486 | { |
f6d62986 | 2487 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 2488 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2489 | |
f029ca5f RS |
2490 | /* If we are dying or still initializing, |
2491 | don't do anything--it would probably crash if we tried. */ | |
2492 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2493 | return Qnil; |
f029ca5f | 2494 | |
b0b667cb | 2495 | sym = args[0]; |
aa681b51 | 2496 | val = find_symbol_value (sym); |
ff936e53 | 2497 | |
b0b667cb | 2498 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2499 | return ret; |
03699b14 | 2500 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2501 | { |
2502 | args[0] = val; | |
f6d62986 | 2503 | return funcall (nargs, args); |
b0b667cb KH |
2504 | } |
2505 | else | |
2506 | { | |
1faed8ae PE |
2507 | Lisp_Object global_vals = Qnil; |
2508 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2509 | |
ff936e53 | 2510 | for (; |
f6d62986 | 2511 | CONSP (val) && NILP (ret); |
03699b14 | 2512 | val = XCDR (val)) |
b0b667cb | 2513 | { |
03699b14 | 2514 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2515 | { |
2516 | /* t indicates this hook has a local binding; | |
2517 | it means to run the global binding too. */ | |
1faed8ae PE |
2518 | global_vals = Fdefault_value (sym); |
2519 | if (NILP (global_vals)) continue; | |
b0b667cb | 2520 | |
1faed8ae | 2521 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2522 | { |
1faed8ae | 2523 | args[0] = global_vals; |
f6d62986 | 2524 | ret = funcall (nargs, args); |
8932b1c2 CY |
2525 | } |
2526 | else | |
2527 | { | |
2528 | for (; | |
f6d62986 | 2529 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 2530 | global_vals = XCDR (global_vals)) |
8932b1c2 | 2531 | { |
1faed8ae | 2532 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2533 | /* In a global value, t should not occur. If it does, we |
2534 | must ignore it to avoid an endless loop. */ | |
2535 | if (!EQ (args[0], Qt)) | |
f6d62986 | 2536 | ret = funcall (nargs, args); |
8932b1c2 | 2537 | } |
b0b667cb KH |
2538 | } |
2539 | } | |
2540 | else | |
2541 | { | |
03699b14 | 2542 | args[0] = XCAR (val); |
f6d62986 | 2543 | ret = funcall (nargs, args); |
b0b667cb KH |
2544 | } |
2545 | } | |
cb9d21f8 RS |
2546 | |
2547 | UNGCPRO; | |
ff936e53 | 2548 | return ret; |
b0b667cb KH |
2549 | } |
2550 | } | |
c933ea05 | 2551 | |
7d48558f RS |
2552 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2553 | ||
2554 | void | |
d3da34e0 | 2555 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2556 | { |
2557 | Lisp_Object temp[3]; | |
2558 | temp[0] = hook; | |
2559 | temp[1] = arg1; | |
2560 | temp[2] = arg2; | |
2561 | ||
2562 | Frun_hook_with_args (3, temp); | |
2563 | } | |
ff936e53 | 2564 | \f |
f6d62986 | 2565 | /* Apply fn to arg. */ |
db9f0278 | 2566 | Lisp_Object |
d3da34e0 | 2567 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2568 | { |
a6e3fa71 JB |
2569 | struct gcpro gcpro1; |
2570 | ||
2571 | GCPRO1 (fn); | |
265a9e55 | 2572 | if (NILP (arg)) |
a6e3fa71 JB |
2573 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2574 | gcpro1.nvars = 2; | |
db9f0278 JB |
2575 | { |
2576 | Lisp_Object args[2]; | |
2577 | args[0] = fn; | |
2578 | args[1] = arg; | |
a6e3fa71 JB |
2579 | gcpro1.var = args; |
2580 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2581 | } |
db9f0278 JB |
2582 | } |
2583 | ||
f6d62986 | 2584 | /* Call function fn on no arguments. */ |
db9f0278 | 2585 | Lisp_Object |
d3da34e0 | 2586 | call0 (Lisp_Object fn) |
db9f0278 | 2587 | { |
a6e3fa71 JB |
2588 | struct gcpro gcpro1; |
2589 | ||
2590 | GCPRO1 (fn); | |
2591 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2592 | } |
2593 | ||
f6d62986 | 2594 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
2595 | /* ARGSUSED */ |
2596 | Lisp_Object | |
d3da34e0 | 2597 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2598 | { |
a6e3fa71 | 2599 | struct gcpro gcpro1; |
177c0ea7 | 2600 | Lisp_Object args[2]; |
a6e3fa71 | 2601 | |
db9f0278 | 2602 | args[0] = fn; |
15285f9f | 2603 | args[1] = arg1; |
a6e3fa71 JB |
2604 | GCPRO1 (args[0]); |
2605 | gcpro1.nvars = 2; | |
2606 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2607 | } |
2608 | ||
f6d62986 | 2609 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
2610 | /* ARGSUSED */ |
2611 | Lisp_Object | |
d3da34e0 | 2612 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2613 | { |
a6e3fa71 | 2614 | struct gcpro gcpro1; |
db9f0278 JB |
2615 | Lisp_Object args[3]; |
2616 | args[0] = fn; | |
15285f9f RS |
2617 | args[1] = arg1; |
2618 | args[2] = arg2; | |
a6e3fa71 JB |
2619 | GCPRO1 (args[0]); |
2620 | gcpro1.nvars = 3; | |
2621 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2622 | } |
2623 | ||
f6d62986 | 2624 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
2625 | /* ARGSUSED */ |
2626 | Lisp_Object | |
d3da34e0 | 2627 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2628 | { |
a6e3fa71 | 2629 | struct gcpro gcpro1; |
db9f0278 JB |
2630 | Lisp_Object args[4]; |
2631 | args[0] = fn; | |
15285f9f RS |
2632 | args[1] = arg1; |
2633 | args[2] = arg2; | |
2634 | args[3] = arg3; | |
a6e3fa71 JB |
2635 | GCPRO1 (args[0]); |
2636 | gcpro1.nvars = 4; | |
2637 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2638 | } |
2639 | ||
f6d62986 | 2640 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
2641 | /* ARGSUSED */ |
2642 | Lisp_Object | |
d3da34e0 JB |
2643 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2644 | Lisp_Object arg4) | |
a5a44b91 JB |
2645 | { |
2646 | struct gcpro gcpro1; | |
a5a44b91 JB |
2647 | Lisp_Object args[5]; |
2648 | args[0] = fn; | |
15285f9f RS |
2649 | args[1] = arg1; |
2650 | args[2] = arg2; | |
2651 | args[3] = arg3; | |
2652 | args[4] = arg4; | |
a5a44b91 JB |
2653 | GCPRO1 (args[0]); |
2654 | gcpro1.nvars = 5; | |
2655 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2656 | } |
2657 | ||
f6d62986 | 2658 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
2659 | /* ARGSUSED */ |
2660 | Lisp_Object | |
d3da34e0 JB |
2661 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2662 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2663 | { |
2664 | struct gcpro gcpro1; | |
15285f9f RS |
2665 | Lisp_Object args[6]; |
2666 | args[0] = fn; | |
2667 | args[1] = arg1; | |
2668 | args[2] = arg2; | |
2669 | args[3] = arg3; | |
2670 | args[4] = arg4; | |
2671 | args[5] = arg5; | |
2672 | GCPRO1 (args[0]); | |
2673 | gcpro1.nvars = 6; | |
2674 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2675 | } |
2676 | ||
f6d62986 | 2677 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
2678 | /* ARGSUSED */ |
2679 | Lisp_Object | |
d3da34e0 JB |
2680 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2681 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2682 | { |
2683 | struct gcpro gcpro1; | |
15285f9f RS |
2684 | Lisp_Object args[7]; |
2685 | args[0] = fn; | |
2686 | args[1] = arg1; | |
2687 | args[2] = arg2; | |
2688 | args[3] = arg3; | |
2689 | args[4] = arg4; | |
2690 | args[5] = arg5; | |
2691 | args[6] = arg6; | |
2692 | GCPRO1 (args[0]); | |
2693 | gcpro1.nvars = 7; | |
2694 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2695 | } |
2696 | ||
f6d62986 | 2697 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
2698 | /* ARGSUSED */ |
2699 | Lisp_Object | |
d3da34e0 JB |
2700 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2701 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2702 | { |
2703 | struct gcpro gcpro1; | |
574c05e2 KK |
2704 | Lisp_Object args[8]; |
2705 | args[0] = fn; | |
2706 | args[1] = arg1; | |
2707 | args[2] = arg2; | |
2708 | args[3] = arg3; | |
2709 | args[4] = arg4; | |
2710 | args[5] = arg5; | |
2711 | args[6] = arg6; | |
2712 | args[7] = arg7; | |
2713 | GCPRO1 (args[0]); | |
2714 | gcpro1.nvars = 8; | |
2715 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2716 | } |
2717 | ||
6c2ef893 RS |
2718 | /* The caller should GCPRO all the elements of ARGS. */ |
2719 | ||
a7ca3326 | 2720 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 2721 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 2722 | (Lisp_Object object) |
b9598260 | 2723 | { |
e1f29348 | 2724 | if (FUNCTIONP (object)) |
b9598260 | 2725 | return Qt; |
e1f29348 | 2726 | return Qnil; |
b9598260 SM |
2727 | } |
2728 | ||
a7ca3326 | 2729 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2730 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2731 | Return the value that function returns. | |
2732 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2733 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2734 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2735 | { |
8788120f | 2736 | Lisp_Object fun, original_fun; |
db9f0278 | 2737 | Lisp_Object funcar; |
f66c7cf8 | 2738 | ptrdiff_t numargs = nargs - 1; |
db9f0278 JB |
2739 | Lisp_Object lisp_numargs; |
2740 | Lisp_Object val; | |
db9f0278 | 2741 | register Lisp_Object *internal_args; |
f66c7cf8 | 2742 | ptrdiff_t i; |
db9f0278 JB |
2743 | |
2744 | QUIT; | |
db9f0278 JB |
2745 | |
2746 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2747 | { | |
2748 | if (max_lisp_eval_depth < 100) | |
2749 | max_lisp_eval_depth = 100; | |
2750 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2751 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2752 | } |
2753 | ||
2f592f95 SM |
2754 | /* This also GCPROs them. */ |
2755 | record_in_backtrace (args[0], &args[1], nargs - 1); | |
db9f0278 | 2756 | |
7abaf5cc SM |
2757 | /* Call GC after setting up the backtrace, so the latter GCPROs the args. */ |
2758 | maybe_gc (); | |
2759 | ||
db9f0278 JB |
2760 | if (debug_on_next_call) |
2761 | do_debug_on_call (Qlambda); | |
2762 | ||
7e63e0c3 | 2763 | check_cons_list (); |
fff3ff9c | 2764 | |
8788120f KS |
2765 | original_fun = args[0]; |
2766 | ||
db9f0278 JB |
2767 | retry: |
2768 | ||
8788120f KS |
2769 | /* Optimize for no indirection. */ |
2770 | fun = original_fun; | |
eadf1faa | 2771 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2772 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2773 | fun = indirect_function (fun); |
db9f0278 | 2774 | |
90165123 | 2775 | if (SUBRP (fun)) |
db9f0278 | 2776 | { |
ef1b0ba7 | 2777 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
2778 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
2779 | { | |
a631e24c | 2780 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 2781 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
2782 | } |
2783 | ||
ef1b0ba7 | 2784 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 2785 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2786 | |
ef1b0ba7 SM |
2787 | else if (XSUBR (fun)->max_args == MANY) |
2788 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 2789 | else |
db9f0278 | 2790 | { |
ef1b0ba7 SM |
2791 | if (XSUBR (fun)->max_args > numargs) |
2792 | { | |
38182d90 PE |
2793 | internal_args = alloca (XSUBR (fun)->max_args |
2794 | * sizeof *internal_args); | |
663e2b3f | 2795 | memcpy (internal_args, args + 1, numargs * word_size); |
ef1b0ba7 SM |
2796 | for (i = numargs; i < XSUBR (fun)->max_args; i++) |
2797 | internal_args[i] = Qnil; | |
2798 | } | |
2799 | else | |
2800 | internal_args = args + 1; | |
2801 | switch (XSUBR (fun)->max_args) | |
2802 | { | |
2803 | case 0: | |
2804 | val = (XSUBR (fun)->function.a0 ()); | |
2805 | break; | |
2806 | case 1: | |
2807 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
2808 | break; | |
2809 | case 2: | |
2810 | val = (XSUBR (fun)->function.a2 | |
2811 | (internal_args[0], internal_args[1])); | |
2812 | break; | |
2813 | case 3: | |
2814 | val = (XSUBR (fun)->function.a3 | |
2815 | (internal_args[0], internal_args[1], internal_args[2])); | |
2816 | break; | |
2817 | case 4: | |
2818 | val = (XSUBR (fun)->function.a4 | |
2819 | (internal_args[0], internal_args[1], internal_args[2], | |
2820 | internal_args[3])); | |
2821 | break; | |
2822 | case 5: | |
2823 | val = (XSUBR (fun)->function.a5 | |
2824 | (internal_args[0], internal_args[1], internal_args[2], | |
2825 | internal_args[3], internal_args[4])); | |
2826 | break; | |
2827 | case 6: | |
2828 | val = (XSUBR (fun)->function.a6 | |
2829 | (internal_args[0], internal_args[1], internal_args[2], | |
2830 | internal_args[3], internal_args[4], internal_args[5])); | |
2831 | break; | |
2832 | case 7: | |
2833 | val = (XSUBR (fun)->function.a7 | |
2834 | (internal_args[0], internal_args[1], internal_args[2], | |
2835 | internal_args[3], internal_args[4], internal_args[5], | |
2836 | internal_args[6])); | |
2837 | break; | |
2838 | ||
2839 | case 8: | |
2840 | val = (XSUBR (fun)->function.a8 | |
2841 | (internal_args[0], internal_args[1], internal_args[2], | |
2842 | internal_args[3], internal_args[4], internal_args[5], | |
2843 | internal_args[6], internal_args[7])); | |
2844 | break; | |
2845 | ||
2846 | default: | |
2847 | ||
2848 | /* If a subr takes more than 8 arguments without using MANY | |
2849 | or UNEVALLED, we need to extend this function to support it. | |
2850 | Until this is done, there is no way to call the function. */ | |
1088b922 | 2851 | emacs_abort (); |
ef1b0ba7 | 2852 | } |
db9f0278 JB |
2853 | } |
2854 | } | |
ef1b0ba7 | 2855 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2856 | val = funcall_lambda (fun, numargs, args + 1); |
2857 | else | |
2858 | { | |
eadf1faa | 2859 | if (NILP (fun)) |
734d55a2 | 2860 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2861 | if (!CONSP (fun)) |
734d55a2 KS |
2862 | xsignal1 (Qinvalid_function, original_fun); |
2863 | funcar = XCAR (fun); | |
90165123 | 2864 | if (!SYMBOLP (funcar)) |
734d55a2 | 2865 | xsignal1 (Qinvalid_function, original_fun); |
defb1411 SM |
2866 | if (EQ (funcar, Qlambda) |
2867 | || EQ (funcar, Qclosure)) | |
db9f0278 | 2868 | val = funcall_lambda (fun, numargs, args + 1); |
db9f0278 JB |
2869 | else if (EQ (funcar, Qautoload)) |
2870 | { | |
7abaf5cc | 2871 | Fautoload_do_load (fun, original_fun, Qnil); |
7e63e0c3 | 2872 | check_cons_list (); |
db9f0278 JB |
2873 | goto retry; |
2874 | } | |
2875 | else | |
734d55a2 | 2876 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2877 | } |
7e63e0c3 | 2878 | check_cons_list (); |
db9f0278 | 2879 | lisp_eval_depth--; |
2f592f95 | 2880 | if (backtrace_debug_on_exit (specpdl_ptr - 1)) |
6c6f1994 | 2881 | val = call_debugger (list2 (Qexit, val)); |
2f592f95 | 2882 | specpdl_ptr--; |
db9f0278 JB |
2883 | return val; |
2884 | } | |
2885 | \f | |
2f7c71a1 | 2886 | static Lisp_Object |
defb1411 | 2887 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
2888 | { |
2889 | Lisp_Object args_left; | |
d311d28c PE |
2890 | ptrdiff_t i; |
2891 | EMACS_INT numargs; | |
db9f0278 JB |
2892 | register Lisp_Object *arg_vector; |
2893 | struct gcpro gcpro1, gcpro2, gcpro3; | |
db9f0278 | 2894 | register Lisp_Object tem; |
3a7a9129 | 2895 | USE_SAFE_ALLOCA; |
db9f0278 | 2896 | |
f66c7cf8 | 2897 | numargs = XFASTINT (Flength (args)); |
c5101a77 | 2898 | SAFE_ALLOCA_LISP (arg_vector, numargs); |
db9f0278 JB |
2899 | args_left = args; |
2900 | ||
2901 | GCPRO3 (*arg_vector, args_left, fun); | |
2902 | gcpro1.nvars = 0; | |
2903 | ||
c5101a77 | 2904 | for (i = 0; i < numargs; ) |
db9f0278 JB |
2905 | { |
2906 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
defb1411 | 2907 | tem = eval_sub (tem); |
db9f0278 JB |
2908 | arg_vector[i++] = tem; |
2909 | gcpro1.nvars = i; | |
2910 | } | |
2911 | ||
2912 | UNGCPRO; | |
2913 | ||
2f592f95 SM |
2914 | set_backtrace_args (specpdl_ptr - 1, arg_vector); |
2915 | set_backtrace_nargs (specpdl_ptr - 1, i); | |
c5101a77 | 2916 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
2917 | |
2918 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2f592f95 SM |
2919 | if (backtrace_debug_on_exit (specpdl_ptr - 1)) |
2920 | { | |
2921 | /* Don't do it again when we return to eval. */ | |
2922 | set_backtrace_debug_on_exit (specpdl_ptr - 1, false); | |
6c6f1994 | 2923 | tem = call_debugger (list2 (Qexit, tem)); |
2f592f95 | 2924 | } |
3a7a9129 | 2925 | SAFE_FREE (); |
db9f0278 JB |
2926 | return tem; |
2927 | } | |
2928 | ||
2929 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2930 | and return the result of evaluation. | |
2931 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2932 | ||
2901f1d1 | 2933 | static Lisp_Object |
f66c7cf8 | 2934 | funcall_lambda (Lisp_Object fun, ptrdiff_t nargs, |
c5101a77 | 2935 | register Lisp_Object *arg_vector) |
db9f0278 | 2936 | { |
defb1411 | 2937 | Lisp_Object val, syms_left, next, lexenv; |
d311d28c | 2938 | ptrdiff_t count = SPECPDL_INDEX (); |
f66c7cf8 | 2939 | ptrdiff_t i; |
1882aa38 | 2940 | bool optional, rest; |
db9f0278 | 2941 | |
90165123 | 2942 | if (CONSP (fun)) |
9ab90667 | 2943 | { |
defb1411 SM |
2944 | if (EQ (XCAR (fun), Qclosure)) |
2945 | { | |
2946 | fun = XCDR (fun); /* Drop `closure'. */ | |
2947 | lexenv = XCAR (fun); | |
23aba0ea | 2948 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
2949 | } |
2950 | else | |
2951 | lexenv = Qnil; | |
9ab90667 GM |
2952 | syms_left = XCDR (fun); |
2953 | if (CONSP (syms_left)) | |
2954 | syms_left = XCAR (syms_left); | |
2955 | else | |
734d55a2 | 2956 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 2957 | } |
90165123 | 2958 | else if (COMPILEDP (fun)) |
defb1411 | 2959 | { |
798cb644 SM |
2960 | syms_left = AREF (fun, COMPILED_ARGLIST); |
2961 | if (INTEGERP (syms_left)) | |
876c194c SM |
2962 | /* A byte-code object with a non-nil `push args' slot means we |
2963 | shouldn't bind any arguments, instead just call the byte-code | |
2964 | interpreter directly; it will push arguments as necessary. | |
2965 | ||
9173deec | 2966 | Byte-code objects with either a non-existent, or a nil value for |
876c194c SM |
2967 | the `push args' slot (the default), have dynamically-bound |
2968 | arguments, and use the argument-binding code below instead (as do | |
2969 | all interpreted functions, even lexically bound ones). */ | |
2970 | { | |
2971 | /* If we have not actually read the bytecode string | |
2972 | and constants vector yet, fetch them from the file. */ | |
2973 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
2974 | Ffetch_bytecode (fun); | |
2975 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
2976 | AREF (fun, COMPILED_CONSTANTS), | |
2977 | AREF (fun, COMPILED_STACK_DEPTH), | |
798cb644 | 2978 | syms_left, |
876c194c SM |
2979 | nargs, arg_vector); |
2980 | } | |
defb1411 SM |
2981 | lexenv = Qnil; |
2982 | } | |
9ab90667 | 2983 | else |
1088b922 | 2984 | emacs_abort (); |
db9f0278 | 2985 | |
9ab90667 GM |
2986 | i = optional = rest = 0; |
2987 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
2988 | { |
2989 | QUIT; | |
177c0ea7 | 2990 | |
9ab90667 | 2991 | next = XCAR (syms_left); |
8788120f | 2992 | if (!SYMBOLP (next)) |
734d55a2 | 2993 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 2994 | |
db9f0278 JB |
2995 | if (EQ (next, Qand_rest)) |
2996 | rest = 1; | |
2997 | else if (EQ (next, Qand_optional)) | |
2998 | optional = 1; | |
db9f0278 | 2999 | else |
db9f0278 | 3000 | { |
e610eaca | 3001 | Lisp_Object arg; |
defb1411 SM |
3002 | if (rest) |
3003 | { | |
e610eaca | 3004 | arg = Flist (nargs - i, &arg_vector[i]); |
defb1411 SM |
3005 | i = nargs; |
3006 | } | |
3007 | else if (i < nargs) | |
e610eaca | 3008 | arg = arg_vector[i++]; |
b9598260 SM |
3009 | else if (!optional) |
3010 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3011 | else | |
e610eaca | 3012 | arg = Qnil; |
7200d79c | 3013 | |
b9598260 | 3014 | /* Bind the argument. */ |
876c194c | 3015 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 | 3016 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
e610eaca | 3017 | lexenv = Fcons (Fcons (next, arg), lexenv); |
b9598260 SM |
3018 | else |
3019 | /* Dynamically bind NEXT. */ | |
e610eaca | 3020 | specbind (next, arg); |
db9f0278 | 3021 | } |
db9f0278 JB |
3022 | } |
3023 | ||
9ab90667 | 3024 | if (!NILP (syms_left)) |
734d55a2 | 3025 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3026 | else if (i < nargs) |
734d55a2 | 3027 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3028 | |
b9598260 SM |
3029 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3030 | /* Instantiate a new lexical environment. */ | |
3031 | specbind (Qinternal_interpreter_environment, lexenv); | |
3032 | ||
90165123 | 3033 | if (CONSP (fun)) |
9ab90667 | 3034 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3035 | else |
ca248607 RS |
3036 | { |
3037 | /* If we have not actually read the bytecode string | |
3038 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3039 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3040 | Ffetch_bytecode (fun); |
b9598260 SM |
3041 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3042 | AREF (fun, COMPILED_CONSTANTS), | |
3043 | AREF (fun, COMPILED_STACK_DEPTH), | |
3044 | Qnil, 0, 0); | |
ca248607 | 3045 | } |
177c0ea7 | 3046 | |
db9f0278 JB |
3047 | return unbind_to (count, val); |
3048 | } | |
661c7d6e KH |
3049 | |
3050 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3051 | 1, 1, 0, |
3052 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3053 | (Lisp_Object object) |
661c7d6e KH |
3054 | { |
3055 | Lisp_Object tem; | |
3056 | ||
845975f5 | 3057 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3058 | { |
845975f5 | 3059 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3060 | if (!CONSP (tem)) |
845975f5 SM |
3061 | { |
3062 | tem = AREF (object, COMPILED_BYTECODE); | |
3063 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3064 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3065 | else |
3066 | error ("Invalid byte code"); | |
3067 | } | |
3ae565b3 SM |
3068 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3069 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3070 | } |
3071 | return object; | |
3072 | } | |
db9f0278 | 3073 | \f |
2f592f95 SM |
3074 | /* Return true if SYMBOL currently has a let-binding |
3075 | which was made in the buffer that is now current. */ | |
3076 | ||
3077 | bool | |
3078 | let_shadows_buffer_binding_p (struct Lisp_Symbol *symbol) | |
db9f0278 | 3079 | { |
9349e5f7 | 3080 | union specbinding *p; |
2f592f95 SM |
3081 | Lisp_Object buf = Fcurrent_buffer (); |
3082 | ||
3083 | for (p = specpdl_ptr; p > specpdl; ) | |
3084 | if ((--p)->kind > SPECPDL_LET) | |
3085 | { | |
3086 | struct Lisp_Symbol *let_bound_symbol = XSYMBOL (specpdl_symbol (p)); | |
3087 | eassert (let_bound_symbol->redirect != SYMBOL_VARALIAS); | |
3088 | if (symbol == let_bound_symbol | |
3089 | && EQ (specpdl_where (p), buf)) | |
3090 | return 1; | |
3091 | } | |
3092 | ||
3093 | return 0; | |
3094 | } | |
3095 | ||
3096 | bool | |
3097 | let_shadows_global_binding_p (Lisp_Object symbol) | |
3098 | { | |
9349e5f7 | 3099 | union specbinding *p; |
2f592f95 SM |
3100 | |
3101 | for (p = specpdl_ptr; p > specpdl; ) | |
3102 | if ((--p)->kind >= SPECPDL_LET && EQ (specpdl_symbol (p), symbol)) | |
3103 | return 1; | |
3104 | ||
3105 | return 0; | |
db9f0278 JB |
3106 | } |
3107 | ||
f6d62986 | 3108 | /* `specpdl_ptr->symbol' is a field which describes which variable is |
4e2db1fe SM |
3109 | let-bound, so it can be properly undone when we unbind_to. |
3110 | It can have the following two shapes: | |
3111 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3112 | a symbol that is not buffer-local (at least at the time | |
3113 | the let binding started). Note also that it should not be | |
3114 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3115 | to record V2 here). | |
3116 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3117 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3118 | which buffer is affected (or nil if the let-binding affects the | |
3119 | global value of the variable) and BUFFER tells us which buffer was | |
3120 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3121 | BUFFER did not yet have a buffer-local value). */ | |
3122 | ||
db9f0278 | 3123 | void |
d3da34e0 | 3124 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3125 | { |
ce5b453a SM |
3126 | struct Lisp_Symbol *sym; |
3127 | ||
b7826503 | 3128 | CHECK_SYMBOL (symbol); |
ce5b453a | 3129 | sym = XSYMBOL (symbol); |
719177b3 | 3130 | |
ce5b453a SM |
3131 | start: |
3132 | switch (sym->redirect) | |
719177b3 | 3133 | { |
ce5b453a SM |
3134 | case SYMBOL_VARALIAS: |
3135 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3136 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3137 | /* The most common case is that of a non-constant symbol with a |
3138 | trivial value. Make that as fast as we can. */ | |
9349e5f7 PE |
3139 | specpdl_ptr->let.kind = SPECPDL_LET; |
3140 | specpdl_ptr->let.symbol = symbol; | |
3141 | specpdl_ptr->let.old_value = SYMBOL_VAL (sym); | |
5e301d76 | 3142 | grow_specpdl (); |
bb8e180f AS |
3143 | if (!sym->constant) |
3144 | SET_SYMBOL_VAL (sym, value); | |
3145 | else | |
3146 | set_internal (symbol, value, Qnil, 1); | |
3147 | break; | |
4e2db1fe SM |
3148 | case SYMBOL_LOCALIZED: |
3149 | if (SYMBOL_BLV (sym)->frame_local) | |
3150 | error ("Frame-local vars cannot be let-bound"); | |
3151 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3152 | { |
3153 | Lisp_Object ovalue = find_symbol_value (symbol); | |
9349e5f7 PE |
3154 | specpdl_ptr->let.kind = SPECPDL_LET_LOCAL; |
3155 | specpdl_ptr->let.symbol = symbol; | |
3156 | specpdl_ptr->let.old_value = ovalue; | |
3157 | specpdl_ptr->let.where = Fcurrent_buffer (); | |
ce5b453a SM |
3158 | |
3159 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
2f592f95 | 3160 | || (EQ (SYMBOL_BLV (sym)->where, Fcurrent_buffer ()))); |
ce5b453a | 3161 | |
2f592f95 SM |
3162 | if (sym->redirect == SYMBOL_LOCALIZED) |
3163 | { | |
3164 | if (!blv_found (SYMBOL_BLV (sym))) | |
9349e5f7 | 3165 | specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT; |
2f592f95 SM |
3166 | } |
3167 | else if (BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
ce5b453a | 3168 | { |
ce5b453a SM |
3169 | /* If SYMBOL is a per-buffer variable which doesn't have a |
3170 | buffer-local value here, make the `let' change the global | |
3171 | value by changing the value of SYMBOL in all buffers not | |
3172 | having their own value. This is consistent with what | |
3173 | happens with other buffer-local variables. */ | |
2f592f95 | 3174 | if (NILP (Flocal_variable_p (symbol, Qnil))) |
ce5b453a | 3175 | { |
9349e5f7 | 3176 | specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT; |
5e301d76 | 3177 | grow_specpdl (); |
ce5b453a SM |
3178 | Fset_default (symbol, value); |
3179 | return; | |
3180 | } | |
3181 | } | |
3182 | else | |
9349e5f7 | 3183 | specpdl_ptr->let.kind = SPECPDL_LET; |
ce5b453a | 3184 | |
5e301d76 | 3185 | grow_specpdl (); |
94b612ad | 3186 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3187 | break; |
3188 | } | |
1088b922 | 3189 | default: emacs_abort (); |
9ab90667 | 3190 | } |
db9f0278 JB |
3191 | } |
3192 | ||
3193 | void | |
27e498e6 | 3194 | record_unwind_protect (void (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3195 | { |
9349e5f7 PE |
3196 | specpdl_ptr->unwind.kind = SPECPDL_UNWIND; |
3197 | specpdl_ptr->unwind.func = function; | |
3198 | specpdl_ptr->unwind.arg = arg; | |
5e301d76 | 3199 | grow_specpdl (); |
db9f0278 JB |
3200 | } |
3201 | ||
27e498e6 PE |
3202 | void |
3203 | record_unwind_protect_ptr (void (*function) (void *), void *arg) | |
3204 | { | |
3205 | specpdl_ptr->unwind_ptr.kind = SPECPDL_UNWIND_PTR; | |
3206 | specpdl_ptr->unwind_ptr.func = function; | |
3207 | specpdl_ptr->unwind_ptr.arg = arg; | |
3208 | grow_specpdl (); | |
3209 | } | |
3210 | ||
3211 | void | |
3212 | record_unwind_protect_int (void (*function) (int), int arg) | |
3213 | { | |
3214 | specpdl_ptr->unwind_int.kind = SPECPDL_UNWIND_INT; | |
3215 | specpdl_ptr->unwind_int.func = function; | |
3216 | specpdl_ptr->unwind_int.arg = arg; | |
3217 | grow_specpdl (); | |
3218 | } | |
3219 | ||
3220 | void | |
3221 | record_unwind_protect_void (void (*function) (void)) | |
3222 | { | |
3223 | specpdl_ptr->unwind_void.kind = SPECPDL_UNWIND_VOID; | |
3224 | specpdl_ptr->unwind_void.func = function; | |
3225 | grow_specpdl (); | |
3226 | } | |
3227 | ||
a0931322 PE |
3228 | static void |
3229 | do_nothing (void) | |
3230 | {} | |
3231 | ||
3232 | void | |
3233 | clear_unwind_protect (ptrdiff_t count) | |
3234 | { | |
3235 | union specbinding *p = specpdl + count; | |
3236 | p->unwind_void.kind = SPECPDL_UNWIND_VOID; | |
3237 | p->unwind_void.func = do_nothing; | |
3238 | } | |
3239 | ||
3240 | void | |
3241 | set_unwind_protect_ptr (ptrdiff_t count, void (*func) (void *), void *arg) | |
3242 | { | |
3243 | union specbinding *p = specpdl + count; | |
3244 | p->unwind_ptr.kind = SPECPDL_UNWIND_PTR; | |
3245 | p->unwind_ptr.func = func; | |
3246 | p->unwind_ptr.arg = arg; | |
3247 | } | |
3248 | ||
db9f0278 | 3249 | Lisp_Object |
d311d28c | 3250 | unbind_to (ptrdiff_t count, Lisp_Object value) |
db9f0278 | 3251 | { |
5a073f50 KS |
3252 | Lisp_Object quitf = Vquit_flag; |
3253 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3254 | |
5a073f50 | 3255 | GCPRO2 (value, quitf); |
db9f0278 JB |
3256 | Vquit_flag = Qnil; |
3257 | ||
3258 | while (specpdl_ptr != specpdl + count) | |
3259 | { | |
9349e5f7 PE |
3260 | /* Decrement specpdl_ptr before we do the work to unbind it, so |
3261 | that an error in unbinding won't try to unbind the same entry | |
3262 | again. Take care to copy any parts of the binding needed | |
3263 | before invoking any code that can make more bindings. */ | |
eb700b82 | 3264 | |
9349e5f7 | 3265 | specpdl_ptr--; |
611a8f8c | 3266 | |
9349e5f7 | 3267 | switch (specpdl_ptr->kind) |
719177b3 | 3268 | { |
2f592f95 | 3269 | case SPECPDL_UNWIND: |
27e498e6 PE |
3270 | specpdl_ptr->unwind.func (specpdl_ptr->unwind.arg); |
3271 | break; | |
3272 | case SPECPDL_UNWIND_PTR: | |
3273 | specpdl_ptr->unwind_ptr.func (specpdl_ptr->unwind_ptr.arg); | |
3274 | break; | |
3275 | case SPECPDL_UNWIND_INT: | |
3276 | specpdl_ptr->unwind_int.func (specpdl_ptr->unwind_int.arg); | |
3277 | break; | |
3278 | case SPECPDL_UNWIND_VOID: | |
3279 | specpdl_ptr->unwind_void.func (); | |
2f592f95 SM |
3280 | break; |
3281 | case SPECPDL_LET: | |
3282 | /* If variable has a trivial value (no forwarding), we can | |
3283 | just set it. No need to check for constant symbols here, | |
3284 | since that was already done by specbind. */ | |
9349e5f7 | 3285 | if (XSYMBOL (specpdl_symbol (specpdl_ptr))->redirect |
2f592f95 | 3286 | == SYMBOL_PLAINVAL) |
9349e5f7 PE |
3287 | SET_SYMBOL_VAL (XSYMBOL (specpdl_symbol (specpdl_ptr)), |
3288 | specpdl_old_value (specpdl_ptr)); | |
2f592f95 SM |
3289 | else |
3290 | /* NOTE: we only ever come here if make_local_foo was used for | |
3291 | the first time on this var within this let. */ | |
9349e5f7 PE |
3292 | Fset_default (specpdl_symbol (specpdl_ptr), |
3293 | specpdl_old_value (specpdl_ptr)); | |
2f592f95 SM |
3294 | break; |
3295 | case SPECPDL_BACKTRACE: | |
3296 | break; | |
3297 | case SPECPDL_LET_LOCAL: | |
3298 | case SPECPDL_LET_DEFAULT: | |
3299 | { /* If the symbol is a list, it is really (SYMBOL WHERE | |
3300 | . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a | |
3301 | frame. If WHERE is a buffer or frame, this indicates we | |
3302 | bound a variable that had a buffer-local or frame-local | |
3303 | binding. WHERE nil means that the variable had the default | |
3304 | value when it was bound. CURRENT-BUFFER is the buffer that | |
3305 | was current when the variable was bound. */ | |
9349e5f7 PE |
3306 | Lisp_Object symbol = specpdl_symbol (specpdl_ptr); |
3307 | Lisp_Object where = specpdl_where (specpdl_ptr); | |
3308 | Lisp_Object old_value = specpdl_old_value (specpdl_ptr); | |
2f592f95 SM |
3309 | eassert (BUFFERP (where)); |
3310 | ||
9349e5f7 PE |
3311 | if (specpdl_ptr->kind == SPECPDL_LET_DEFAULT) |
3312 | Fset_default (symbol, old_value); | |
2f592f95 SM |
3313 | /* If this was a local binding, reset the value in the appropriate |
3314 | buffer, but only if that buffer's binding still exists. */ | |
3315 | else if (!NILP (Flocal_variable_p (symbol, where))) | |
9349e5f7 | 3316 | set_internal (symbol, old_value, where, 1); |
2f592f95 SM |
3317 | } |
3318 | break; | |
719177b3 | 3319 | } |
db9f0278 | 3320 | } |
177c0ea7 | 3321 | |
5a073f50 KS |
3322 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3323 | Vquit_flag = quitf; | |
db9f0278 JB |
3324 | |
3325 | UNGCPRO; | |
db9f0278 JB |
3326 | return value; |
3327 | } | |
b9598260 | 3328 | |
4a330052 | 3329 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3330 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3331 | A special variable is one that will be bound dynamically, even in a | |
3332 | context where binding is lexical by default. */) | |
c566235d | 3333 | (Lisp_Object symbol) |
b9598260 SM |
3334 | { |
3335 | CHECK_SYMBOL (symbol); | |
3336 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3337 | } | |
3338 | ||
db9f0278 | 3339 | \f |
db9f0278 | 3340 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3341 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3342 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3343 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 | 3344 | { |
9349e5f7 | 3345 | union specbinding *pdl = backtrace_top (); |
d311d28c | 3346 | register EMACS_INT i; |
db9f0278 | 3347 | |
b7826503 | 3348 | CHECK_NUMBER (level); |
db9f0278 | 3349 | |
2f592f95 SM |
3350 | for (i = 0; backtrace_p (pdl) && i < XINT (level); i++) |
3351 | pdl = backtrace_next (pdl); | |
db9f0278 | 3352 | |
2f592f95 SM |
3353 | if (backtrace_p (pdl)) |
3354 | set_backtrace_debug_on_exit (pdl, !NILP (flag)); | |
db9f0278 JB |
3355 | |
3356 | return flag; | |
3357 | } | |
3358 | ||
3359 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3360 | doc: /* Print a trace of Lisp function calls currently active. |
3361 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3362 | (void) |
db9f0278 | 3363 | { |
9349e5f7 | 3364 | union specbinding *pdl = backtrace_top (); |
db9f0278 | 3365 | Lisp_Object tem; |
d4b6d95d | 3366 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3367 | |
d4b6d95d LMI |
3368 | if (NILP (Vprint_level)) |
3369 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 | 3370 | |
2f592f95 | 3371 | while (backtrace_p (pdl)) |
db9f0278 | 3372 | { |
2f592f95 SM |
3373 | write_string (backtrace_debug_on_exit (pdl) ? "* " : " ", 2); |
3374 | if (backtrace_nargs (pdl) == UNEVALLED) | |
db9f0278 | 3375 | { |
2f592f95 SM |
3376 | Fprin1 (Fcons (backtrace_function (pdl), *backtrace_args (pdl)), |
3377 | Qnil); | |
b6703b02 | 3378 | write_string ("\n", -1); |
db9f0278 JB |
3379 | } |
3380 | else | |
3381 | { | |
2f592f95 | 3382 | tem = backtrace_function (pdl); |
f6d62986 | 3383 | Fprin1 (tem, Qnil); /* This can QUIT. */ |
db9f0278 | 3384 | write_string ("(", -1); |
2f592f95 SM |
3385 | { |
3386 | ptrdiff_t i; | |
3387 | for (i = 0; i < backtrace_nargs (pdl); i++) | |
3388 | { | |
3389 | if (i) write_string (" ", -1); | |
3390 | Fprin1 (backtrace_args (pdl)[i], Qnil); | |
3391 | } | |
3392 | } | |
b6703b02 | 3393 | write_string (")\n", -1); |
db9f0278 | 3394 | } |
2f592f95 | 3395 | pdl = backtrace_next (pdl); |
db9f0278 JB |
3396 | } |
3397 | ||
d4b6d95d | 3398 | Vprint_level = old_print_level; |
db9f0278 JB |
3399 | return Qnil; |
3400 | } | |
3401 | ||
17401c97 | 3402 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL, |
9dbc9081 PJ |
3403 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3404 | If that frame has not evaluated the arguments yet (or is a special form), | |
3405 | the value is (nil FUNCTION ARG-FORMS...). | |
3406 | If that frame has evaluated its arguments and called its function already, | |
3407 | the value is (t FUNCTION ARG-VALUES...). | |
3408 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3409 | FUNCTION is whatever was supplied as car of evaluated list, | |
3410 | or a lambda expression for macro calls. | |
3411 | If NFRAMES is more than the number of frames, the value is nil. */) | |
5842a27b | 3412 | (Lisp_Object nframes) |
db9f0278 | 3413 | { |
9349e5f7 | 3414 | union specbinding *pdl = backtrace_top (); |
5d5d959d | 3415 | register EMACS_INT i; |
db9f0278 | 3416 | |
b7826503 | 3417 | CHECK_NATNUM (nframes); |
db9f0278 JB |
3418 | |
3419 | /* Find the frame requested. */ | |
2f592f95 SM |
3420 | for (i = 0; backtrace_p (pdl) && i < XFASTINT (nframes); i++) |
3421 | pdl = backtrace_next (pdl); | |
db9f0278 | 3422 | |
2f592f95 | 3423 | if (!backtrace_p (pdl)) |
db9f0278 | 3424 | return Qnil; |
2f592f95 SM |
3425 | if (backtrace_nargs (pdl) == UNEVALLED) |
3426 | return Fcons (Qnil, | |
3427 | Fcons (backtrace_function (pdl), *backtrace_args (pdl))); | |
db9f0278 JB |
3428 | else |
3429 | { | |
2f592f95 | 3430 | Lisp_Object tem = Flist (backtrace_nargs (pdl), backtrace_args (pdl)); |
db9f0278 | 3431 | |
2f592f95 | 3432 | return Fcons (Qt, Fcons (backtrace_function (pdl), tem)); |
db9f0278 JB |
3433 | } |
3434 | } | |
a2ff3819 | 3435 | |
db9f0278 | 3436 | \f |
4ce0541e | 3437 | void |
2f592f95 | 3438 | mark_specpdl (void) |
4ce0541e | 3439 | { |
9349e5f7 | 3440 | union specbinding *pdl; |
2f592f95 | 3441 | for (pdl = specpdl; pdl != specpdl_ptr; pdl++) |
4ce0541e | 3442 | { |
2f592f95 SM |
3443 | switch (pdl->kind) |
3444 | { | |
3445 | case SPECPDL_UNWIND: | |
3446 | mark_object (specpdl_arg (pdl)); | |
3447 | break; | |
9349e5f7 | 3448 | |
2f592f95 SM |
3449 | case SPECPDL_BACKTRACE: |
3450 | { | |
3451 | ptrdiff_t nargs = backtrace_nargs (pdl); | |
3452 | mark_object (backtrace_function (pdl)); | |
3453 | if (nargs == UNEVALLED) | |
3454 | nargs = 1; | |
3455 | while (nargs--) | |
3456 | mark_object (backtrace_args (pdl)[nargs]); | |
3457 | } | |
3458 | break; | |
9349e5f7 | 3459 | |
2f592f95 SM |
3460 | case SPECPDL_LET_DEFAULT: |
3461 | case SPECPDL_LET_LOCAL: | |
3462 | mark_object (specpdl_where (pdl)); | |
9349e5f7 | 3463 | /* Fall through. */ |
2f592f95 SM |
3464 | case SPECPDL_LET: |
3465 | mark_object (specpdl_symbol (pdl)); | |
3466 | mark_object (specpdl_old_value (pdl)); | |
9349e5f7 | 3467 | break; |
2f592f95 SM |
3468 | } |
3469 | } | |
3470 | } | |
3471 | ||
3472 | void | |
3473 | get_backtrace (Lisp_Object array) | |
3474 | { | |
9349e5f7 | 3475 | union specbinding *pdl = backtrace_next (backtrace_top ()); |
2f592f95 | 3476 | ptrdiff_t i = 0, asize = ASIZE (array); |
4ce0541e | 3477 | |
2f592f95 SM |
3478 | /* Copy the backtrace contents into working memory. */ |
3479 | for (; i < asize; i++) | |
3480 | { | |
3481 | if (backtrace_p (pdl)) | |
3482 | { | |
3483 | ASET (array, i, backtrace_function (pdl)); | |
3484 | pdl = backtrace_next (pdl); | |
3485 | } | |
4ce0541e | 3486 | else |
2f592f95 | 3487 | ASET (array, i, Qnil); |
4ce0541e SM |
3488 | } |
3489 | } | |
2f592f95 SM |
3490 | |
3491 | Lisp_Object backtrace_top_function (void) | |
3492 | { | |
9349e5f7 | 3493 | union specbinding *pdl = backtrace_top (); |
2f592f95 SM |
3494 | return (backtrace_p (pdl) ? backtrace_function (pdl) : Qnil); |
3495 | } | |
4ce0541e | 3496 | |
dfcf069d | 3497 | void |
d3da34e0 | 3498 | syms_of_eval (void) |
db9f0278 | 3499 | { |
29208e82 | 3500 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
fb7ada5f | 3501 | doc: /* Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3502 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3503 | an error is signaled. |
3504 | You can safely use a value considerably larger than the default value, | |
3505 | if that proves inconveniently small. However, if you increase it too far, | |
3506 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3507 | |
29208e82 | 3508 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
fb7ada5f | 3509 | doc: /* Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3510 | |
3511 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3512 | actual stack overflow in C, which would be fatal for Emacs. |
3513 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3514 | if that proves inconveniently small. However, if you increase it too far, |
3515 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3516 | |
29208e82 | 3517 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3518 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3519 | If the value is t, that means do an ordinary quit. |
3520 | If the value equals `throw-on-input', that means quit by throwing | |
3521 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3522 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3523 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3524 | Vquit_flag = Qnil; |
3525 | ||
29208e82 | 3526 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3527 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3528 | Note that `quit-flag' will still be set by typing C-g, | |
3529 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3530 | To prevent this happening, set `quit-flag' to nil | |
3531 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3532 | Vinhibit_quit = Qnil; |
3533 | ||
cd3520a4 JB |
3534 | DEFSYM (Qinhibit_quit, "inhibit-quit"); |
3535 | DEFSYM (Qautoload, "autoload"); | |
45b82ad0 | 3536 | DEFSYM (Qinhibit_debugger, "inhibit-debugger"); |
cd3520a4 JB |
3537 | DEFSYM (Qmacro, "macro"); |
3538 | DEFSYM (Qdeclare, "declare"); | |
177c0ea7 | 3539 | |
db9f0278 JB |
3540 | /* Note that the process handling also uses Qexit, but we don't want |
3541 | to staticpro it twice, so we just do it here. */ | |
cd3520a4 | 3542 | DEFSYM (Qexit, "exit"); |
b9598260 | 3543 | |
cd3520a4 JB |
3544 | DEFSYM (Qinteractive, "interactive"); |
3545 | DEFSYM (Qcommandp, "commandp"); | |
cd3520a4 JB |
3546 | DEFSYM (Qand_rest, "&rest"); |
3547 | DEFSYM (Qand_optional, "&optional"); | |
3548 | DEFSYM (Qclosure, "closure"); | |
3549 | DEFSYM (Qdebug, "debug"); | |
f01cbfdd | 3550 | |
45b82ad0 SM |
3551 | DEFVAR_LISP ("inhibit-debugger", Vinhibit_debugger, |
3552 | doc: /* Non-nil means never enter the debugger. | |
3553 | Normally set while the debugger is already active, to avoid recursive | |
3554 | invocations. */); | |
3555 | Vinhibit_debugger = Qnil; | |
3556 | ||
29208e82 | 3557 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
fb7ada5f | 3558 | doc: /* Non-nil means enter debugger if an error is signaled. |
9dbc9081 PJ |
3559 | Does not apply to errors handled by `condition-case' or those |
3560 | matched by `debug-ignored-errors'. | |
3561 | If the value is a list, an error only means to enter the debugger | |
3562 | if one of its condition symbols appears in the list. | |
3563 | When you evaluate an expression interactively, this variable | |
3564 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f | 3565 | The command `toggle-debug-on-error' toggles this. |
45b82ad0 | 3566 | See also the variable `debug-on-quit' and `inhibit-debugger'. */); |
128c0f66 | 3567 | Vdebug_on_error = Qnil; |
db9f0278 | 3568 | |
29208e82 | 3569 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
fb7ada5f | 3570 | doc: /* List of errors for which the debugger should not be called. |
9dbc9081 PJ |
3571 | Each element may be a condition-name or a regexp that matches error messages. |
3572 | If any element applies to a given error, that error skips the debugger | |
3573 | and just returns to top level. | |
3574 | This overrides the variable `debug-on-error'. | |
3575 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3576 | Vdebug_ignored_errors = Qnil; |
3577 | ||
29208e82 | 3578 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
fb7ada5f | 3579 | doc: /* Non-nil means enter debugger if quit is signaled (C-g, for example). |
82fc29a1 | 3580 | Does not apply if quit is handled by a `condition-case'. */); |
db9f0278 JB |
3581 | debug_on_quit = 0; |
3582 | ||
29208e82 | 3583 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3584 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3585 | |
29208e82 | 3586 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3587 | doc: /* Non-nil means debugger may continue execution. |
3588 | This is nil when the debugger is called under circumstances where it | |
3589 | might not be safe to continue. */); | |
dac204bc | 3590 | debugger_may_continue = 1; |
556d7314 | 3591 | |
29208e82 | 3592 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3593 | doc: /* Function to call to invoke debugger. |
3594 | If due to frame exit, args are `exit' and the value being returned; | |
3595 | this function's value will be returned instead of that. | |
3596 | If due to error, args are `error' and a list of the args to `signal'. | |
3597 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3598 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3599 | Vdebugger = Qnil; |
3600 | ||
29208e82 | 3601 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3602 | doc: /* If non-nil, this is a function for `signal' to call. |
3603 | It receives the same arguments that `signal' was given. | |
3604 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3605 | Vsignal_hook_function = Qnil; |
3606 | ||
29208e82 | 3607 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
fb7ada5f | 3608 | doc: /* Non-nil means call the debugger regardless of condition handlers. |
9dbc9081 PJ |
3609 | Note that `debug-on-error', `debug-on-quit' and friends |
3610 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3611 | Vdebug_on_signal = Qnil; |
61ede770 | 3612 | |
b38b1ec0 | 3613 | /* When lexical binding is being used, |
61b108cc | 3614 | Vinternal_interpreter_environment is non-nil, and contains an alist |
b38b1ec0 SM |
3615 | of lexically-bound variable, or (t), indicating an empty |
3616 | environment. The lisp name of this variable would be | |
3617 | `internal-interpreter-environment' if it weren't hidden. | |
3618 | Every element of this list can be either a cons (VAR . VAL) | |
3619 | specifying a lexical binding, or a single symbol VAR indicating | |
3620 | that this variable should use dynamic scoping. */ | |
61b108cc SM |
3621 | DEFSYM (Qinternal_interpreter_environment, |
3622 | "internal-interpreter-environment"); | |
b38b1ec0 SM |
3623 | DEFVAR_LISP ("internal-interpreter-environment", |
3624 | Vinternal_interpreter_environment, | |
b9598260 SM |
3625 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
3626 | When lexical binding is not being used, this variable is nil. | |
3627 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3628 | alist of active lexical bindings. */); | |
3629 | Vinternal_interpreter_environment = Qnil; | |
c80e3b4a | 3630 | /* Don't export this variable to Elisp, so no one can mess with it |
b38b1ec0 SM |
3631 | (Just imagine if someone makes it buffer-local). */ |
3632 | Funintern (Qinternal_interpreter_environment, Qnil); | |
b9598260 | 3633 | |
cd3520a4 | 3634 | DEFSYM (Vrun_hooks, "run-hooks"); |
db9f0278 JB |
3635 | |
3636 | staticpro (&Vautoload_queue); | |
3637 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3638 | staticpro (&Vsignaling_function); |
3639 | Vsignaling_function = Qnil; | |
db9f0278 | 3640 | |
d1f55f16 CY |
3641 | inhibit_lisp_code = Qnil; |
3642 | ||
db9f0278 JB |
3643 | defsubr (&Sor); |
3644 | defsubr (&Sand); | |
3645 | defsubr (&Sif); | |
3646 | defsubr (&Scond); | |
3647 | defsubr (&Sprogn); | |
3648 | defsubr (&Sprog1); | |
3649 | defsubr (&Sprog2); | |
3650 | defsubr (&Ssetq); | |
3651 | defsubr (&Squote); | |
3652 | defsubr (&Sfunction); | |
db9f0278 | 3653 | defsubr (&Sdefvar); |
19cebf5a | 3654 | defsubr (&Sdefvaralias); |
db9f0278 | 3655 | defsubr (&Sdefconst); |
513749ee | 3656 | defsubr (&Smake_var_non_special); |
db9f0278 JB |
3657 | defsubr (&Slet); |
3658 | defsubr (&SletX); | |
3659 | defsubr (&Swhile); | |
3660 | defsubr (&Smacroexpand); | |
3661 | defsubr (&Scatch); | |
3662 | defsubr (&Sthrow); | |
3663 | defsubr (&Sunwind_protect); | |
3664 | defsubr (&Scondition_case); | |
3665 | defsubr (&Ssignal); | |
db9f0278 JB |
3666 | defsubr (&Scommandp); |
3667 | defsubr (&Sautoload); | |
7abaf5cc | 3668 | defsubr (&Sautoload_do_load); |
db9f0278 JB |
3669 | defsubr (&Seval); |
3670 | defsubr (&Sapply); | |
3671 | defsubr (&Sfuncall); | |
ff936e53 SM |
3672 | defsubr (&Srun_hooks); |
3673 | defsubr (&Srun_hook_with_args); | |
3674 | defsubr (&Srun_hook_with_args_until_success); | |
3675 | defsubr (&Srun_hook_with_args_until_failure); | |
f6d62986 | 3676 | defsubr (&Srun_hook_wrapped); |
661c7d6e | 3677 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3678 | defsubr (&Sbacktrace_debug); |
3679 | defsubr (&Sbacktrace); | |
3680 | defsubr (&Sbacktrace_frame); | |
4a330052 | 3681 | defsubr (&Sspecial_variable_p); |
b9598260 | 3682 | defsubr (&Sfunctionp); |
db9f0278 | 3683 | } |