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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 | ||
56ea7291 SM |
141 | static void |
142 | set_specpdl_old_value (union specbinding *pdl, Lisp_Object val) | |
143 | { | |
144 | eassert (pdl->kind >= SPECPDL_LET); | |
145 | pdl->let.old_value = val; | |
146 | } | |
147 | ||
84575e67 | 148 | static Lisp_Object |
9349e5f7 | 149 | specpdl_where (union specbinding *pdl) |
84575e67 PE |
150 | { |
151 | eassert (pdl->kind > SPECPDL_LET); | |
9349e5f7 | 152 | return pdl->let.where; |
84575e67 PE |
153 | } |
154 | ||
155 | static Lisp_Object | |
9349e5f7 | 156 | specpdl_arg (union specbinding *pdl) |
84575e67 PE |
157 | { |
158 | eassert (pdl->kind == SPECPDL_UNWIND); | |
9349e5f7 | 159 | return pdl->unwind.arg; |
84575e67 PE |
160 | } |
161 | ||
9c203066 | 162 | Lisp_Object |
9349e5f7 | 163 | backtrace_function (union specbinding *pdl) |
84575e67 PE |
164 | { |
165 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 166 | return pdl->bt.function; |
84575e67 PE |
167 | } |
168 | ||
169 | static ptrdiff_t | |
9349e5f7 | 170 | backtrace_nargs (union specbinding *pdl) |
84575e67 PE |
171 | { |
172 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 173 | return pdl->bt.nargs; |
84575e67 PE |
174 | } |
175 | ||
9c203066 | 176 | Lisp_Object * |
9349e5f7 | 177 | backtrace_args (union specbinding *pdl) |
84575e67 PE |
178 | { |
179 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 180 | return pdl->bt.args; |
84575e67 PE |
181 | } |
182 | ||
183 | static bool | |
9349e5f7 | 184 | backtrace_debug_on_exit (union specbinding *pdl) |
84575e67 PE |
185 | { |
186 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 187 | return pdl->bt.debug_on_exit; |
84575e67 PE |
188 | } |
189 | ||
2f592f95 | 190 | /* Functions to modify slots of backtrace records. */ |
e46f2325 | 191 | |
3d5ee10a | 192 | static void |
9349e5f7 PE |
193 | set_backtrace_args (union specbinding *pdl, Lisp_Object *args) |
194 | { | |
195 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
196 | pdl->bt.args = args; | |
197 | } | |
2f592f95 | 198 | |
3d5ee10a | 199 | static void |
9349e5f7 PE |
200 | set_backtrace_nargs (union specbinding *pdl, ptrdiff_t n) |
201 | { | |
202 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
203 | pdl->bt.nargs = n; | |
204 | } | |
2f592f95 | 205 | |
3d5ee10a | 206 | static void |
9349e5f7 PE |
207 | set_backtrace_debug_on_exit (union specbinding *pdl, bool doe) |
208 | { | |
209 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
210 | pdl->bt.debug_on_exit = doe; | |
211 | } | |
2f592f95 SM |
212 | |
213 | /* Helper functions to scan the backtrace. */ | |
214 | ||
9349e5f7 PE |
215 | bool |
216 | backtrace_p (union specbinding *pdl) | |
2f592f95 | 217 | { return pdl >= specpdl; } |
a8a7c5f6 | 218 | |
9349e5f7 | 219 | union specbinding * |
3d5ee10a | 220 | backtrace_top (void) |
e46f2325 | 221 | { |
9349e5f7 | 222 | union specbinding *pdl = specpdl_ptr - 1; |
a8a7c5f6 | 223 | while (backtrace_p (pdl) && pdl->kind != SPECPDL_BACKTRACE) |
2f592f95 SM |
224 | pdl--; |
225 | return pdl; | |
e46f2325 | 226 | } |
a8a7c5f6 | 227 | |
9349e5f7 PE |
228 | union specbinding * |
229 | backtrace_next (union specbinding *pdl) | |
e46f2325 | 230 | { |
2f592f95 SM |
231 | pdl--; |
232 | while (backtrace_p (pdl) && pdl->kind != SPECPDL_BACKTRACE) | |
233 | pdl--; | |
234 | return pdl; | |
e46f2325 DA |
235 | } |
236 | ||
2f592f95 | 237 | |
dfcf069d | 238 | void |
d3da34e0 | 239 | init_eval_once (void) |
db9f0278 | 240 | { |
98e8eae1 | 241 | enum { size = 50 }; |
9349e5f7 | 242 | union specbinding *pdlvec = xmalloc ((size + 1) * sizeof *specpdl); |
98e8eae1 | 243 | specpdl_size = size; |
9349e5f7 | 244 | specpdl = specpdl_ptr = pdlvec + 1; |
6588243d | 245 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
c530e1c2 | 246 | max_specpdl_size = 1300; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 247 | max_lisp_eval_depth = 600; |
34d470ba RS |
248 | |
249 | Vrun_hooks = Qnil; | |
db9f0278 JB |
250 | } |
251 | ||
dfcf069d | 252 | void |
d3da34e0 | 253 | init_eval (void) |
db9f0278 JB |
254 | { |
255 | specpdl_ptr = specpdl; | |
256 | catchlist = 0; | |
257 | handlerlist = 0; | |
db9f0278 JB |
258 | Vquit_flag = Qnil; |
259 | debug_on_next_call = 0; | |
260 | lisp_eval_depth = 0; | |
87e21fbd | 261 | #ifdef DEBUG_GCPRO |
15934ffa | 262 | gcpro_level = 0; |
87e21fbd | 263 | #endif |
be857679 | 264 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 265 | when_entered_debugger = -1; |
db9f0278 JB |
266 | } |
267 | ||
f6d62986 | 268 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb | 269 | |
27e498e6 | 270 | static void |
d3da34e0 | 271 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
272 | { |
273 | max_specpdl_size = XINT (XCAR (data)); | |
274 | max_lisp_eval_depth = XINT (XCDR (data)); | |
275 | } | |
276 | ||
277 | /* Call the Lisp debugger, giving it argument ARG. */ | |
278 | ||
7f7e0167 | 279 | Lisp_Object |
d3da34e0 | 280 | call_debugger (Lisp_Object arg) |
db9f0278 | 281 | { |
1882aa38 | 282 | bool debug_while_redisplaying; |
d311d28c | 283 | ptrdiff_t count = SPECPDL_INDEX (); |
3648c842 | 284 | Lisp_Object val; |
5816888b | 285 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 286 | |
9f5903bb RS |
287 | /* Temporarily bump up the stack limits, |
288 | so the debugger won't run out of stack. */ | |
177c0ea7 | 289 | |
9f5903bb RS |
290 | max_specpdl_size += 1; |
291 | record_unwind_protect (restore_stack_limits, | |
292 | Fcons (make_number (old_max), | |
293 | make_number (max_lisp_eval_depth))); | |
294 | max_specpdl_size = old_max; | |
295 | ||
296 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
297 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
298 | ||
98e8eae1 | 299 | if (max_specpdl_size - 100 < SPECPDL_INDEX ()) |
9f5903bb | 300 | max_specpdl_size = SPECPDL_INDEX () + 100; |
177c0ea7 | 301 | |
d148e14d | 302 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
303 | if (display_hourglass_p) |
304 | cancel_hourglass (); | |
237c23b0 GM |
305 | #endif |
306 | ||
db9f0278 | 307 | debug_on_next_call = 0; |
be857679 | 308 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
309 | |
310 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
311 | displayed if the debugger is invoked during redisplay. */ | |
312 | debug_while_redisplaying = redisplaying_p; | |
313 | redisplaying_p = 0; | |
556d7314 GM |
314 | specbind (intern ("debugger-may-continue"), |
315 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 316 | specbind (Qinhibit_redisplay, Qnil); |
45b82ad0 | 317 | specbind (Qinhibit_debugger, Qt); |
9db6f6b4 GM |
318 | |
319 | #if 0 /* Binding this prevents execution of Lisp code during | |
320 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 321 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 322 | #endif |
177c0ea7 | 323 | |
3648c842 GM |
324 | val = apply1 (Vdebugger, arg); |
325 | ||
326 | /* Interrupting redisplay and resuming it later is not safe under | |
327 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 328 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
329 | if (debug_while_redisplaying) |
330 | Ftop_level (); | |
331 | ||
556d7314 | 332 | return unbind_to (count, val); |
db9f0278 JB |
333 | } |
334 | ||
475545b5 | 335 | static void |
d3da34e0 | 336 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
337 | { |
338 | debug_on_next_call = 0; | |
2f592f95 | 339 | set_backtrace_debug_on_exit (specpdl_ptr - 1, true); |
6c6f1994 | 340 | call_debugger (list1 (code)); |
db9f0278 JB |
341 | } |
342 | \f | |
343 | /* NOTE!!! Every function that can call EVAL must protect its args | |
344 | and temporaries from garbage collection while it needs them. | |
345 | The definition of `For' shows what you have to do. */ | |
346 | ||
347 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
348 | doc: /* Eval args until one of them yields non-nil, then return that value. |
349 | The remaining args are not evalled at all. | |
350 | If all args return nil, return nil. | |
533eb34b | 351 | usage: (or CONDITIONS...) */) |
5842a27b | 352 | (Lisp_Object args) |
db9f0278 | 353 | { |
e509f168 | 354 | register Lisp_Object val = Qnil; |
db9f0278 JB |
355 | struct gcpro gcpro1; |
356 | ||
e509f168 | 357 | GCPRO1 (args); |
db9f0278 | 358 | |
e509f168 | 359 | while (CONSP (args)) |
db9f0278 | 360 | { |
defb1411 | 361 | val = eval_sub (XCAR (args)); |
265a9e55 | 362 | if (!NILP (val)) |
db9f0278 | 363 | break; |
e509f168 | 364 | args = XCDR (args); |
db9f0278 | 365 | } |
db9f0278 JB |
366 | |
367 | UNGCPRO; | |
368 | return val; | |
369 | } | |
370 | ||
371 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 372 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
373 | The remaining args are not evalled at all. |
374 | If no arg yields nil, return the last arg's value. | |
533eb34b | 375 | usage: (and CONDITIONS...) */) |
5842a27b | 376 | (Lisp_Object args) |
db9f0278 | 377 | { |
e509f168 | 378 | register Lisp_Object val = Qt; |
db9f0278 JB |
379 | struct gcpro gcpro1; |
380 | ||
e509f168 | 381 | GCPRO1 (args); |
db9f0278 | 382 | |
e509f168 | 383 | while (CONSP (args)) |
db9f0278 | 384 | { |
defb1411 | 385 | val = eval_sub (XCAR (args)); |
265a9e55 | 386 | if (NILP (val)) |
db9f0278 | 387 | break; |
e509f168 | 388 | args = XCDR (args); |
db9f0278 | 389 | } |
db9f0278 JB |
390 | |
391 | UNGCPRO; | |
392 | return val; | |
393 | } | |
394 | ||
395 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 396 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
397 | Returns the value of THEN or the value of the last of the ELSE's. |
398 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
399 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 400 | usage: (if COND THEN ELSE...) */) |
5842a27b | 401 | (Lisp_Object args) |
db9f0278 | 402 | { |
16b0520a | 403 | Lisp_Object cond; |
db9f0278 JB |
404 | struct gcpro gcpro1; |
405 | ||
406 | GCPRO1 (args); | |
16b0520a | 407 | cond = eval_sub (XCAR (args)); |
db9f0278 JB |
408 | UNGCPRO; |
409 | ||
265a9e55 | 410 | if (!NILP (cond)) |
16b0520a PE |
411 | return eval_sub (Fcar (XCDR (args))); |
412 | return Fprogn (XCDR (XCDR (args))); | |
db9f0278 JB |
413 | } |
414 | ||
415 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
416 | doc: /* Try each clause until one succeeds. |
417 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
418 | and, if the value is non-nil, this clause succeeds: | |
419 | then the expressions in BODY are evaluated and the last one's | |
420 | value is the value of the cond-form. | |
421 | If no clause succeeds, cond returns nil. | |
422 | If a clause has one element, as in (CONDITION), | |
423 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 424 | usage: (cond CLAUSES...) */) |
5842a27b | 425 | (Lisp_Object args) |
db9f0278 | 426 | { |
16b0520a | 427 | Lisp_Object val = args; |
db9f0278 JB |
428 | struct gcpro gcpro1; |
429 | ||
db9f0278 | 430 | GCPRO1 (args); |
16b0520a | 431 | while (CONSP (args)) |
db9f0278 | 432 | { |
16b0520a | 433 | Lisp_Object clause = XCAR (args); |
defb1411 | 434 | val = eval_sub (Fcar (clause)); |
265a9e55 | 435 | if (!NILP (val)) |
db9f0278 | 436 | { |
16b0520a | 437 | if (!NILP (XCDR (clause))) |
03699b14 | 438 | val = Fprogn (XCDR (clause)); |
db9f0278 JB |
439 | break; |
440 | } | |
03699b14 | 441 | args = XCDR (args); |
db9f0278 JB |
442 | } |
443 | UNGCPRO; | |
444 | ||
445 | return val; | |
446 | } | |
447 | ||
a7ca3326 | 448 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, |
9dbc9081 | 449 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 450 | usage: (progn BODY...) */) |
27e498e6 | 451 | (Lisp_Object body) |
db9f0278 | 452 | { |
27e498e6 | 453 | Lisp_Object val = Qnil; |
db9f0278 JB |
454 | struct gcpro gcpro1; |
455 | ||
27e498e6 | 456 | GCPRO1 (body); |
db9f0278 | 457 | |
27e498e6 | 458 | while (CONSP (body)) |
db9f0278 | 459 | { |
27e498e6 PE |
460 | val = eval_sub (XCAR (body)); |
461 | body = XCDR (body); | |
db9f0278 | 462 | } |
db9f0278 JB |
463 | |
464 | UNGCPRO; | |
465 | return val; | |
466 | } | |
467 | ||
02c66599 | 468 | /* Evaluate BODY sequentially, discarding its value. Suitable for |
27e498e6 PE |
469 | record_unwind_protect. */ |
470 | ||
471 | void | |
472 | unwind_body (Lisp_Object body) | |
473 | { | |
474 | Fprogn (body); | |
475 | } | |
476 | ||
db9f0278 | 477 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, |
bdee2ef3 | 478 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
479 | The value of FIRST is saved during the evaluation of the remaining args, |
480 | whose values are discarded. | |
7a25dc6d | 481 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 482 | (Lisp_Object args) |
db9f0278 JB |
483 | { |
484 | Lisp_Object val; | |
16b0520a | 485 | Lisp_Object args_left; |
db9f0278 | 486 | struct gcpro gcpro1, gcpro2; |
db9f0278 JB |
487 | |
488 | args_left = args; | |
16b0520a | 489 | val = args; |
db9f0278 JB |
490 | GCPRO2 (args, val); |
491 | ||
856bbc81 PE |
492 | val = eval_sub (XCAR (args_left)); |
493 | while (CONSP (args_left = XCDR (args_left))) | |
494 | eval_sub (XCAR (args_left)); | |
db9f0278 JB |
495 | |
496 | UNGCPRO; | |
497 | return val; | |
498 | } | |
499 | ||
500 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 501 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
502 | The value of FORM2 is saved during the evaluation of the |
503 | remaining args, whose values are discarded. | |
504 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 505 | (Lisp_Object args) |
db9f0278 | 506 | { |
856bbc81 | 507 | struct gcpro gcpro1; |
db9f0278 | 508 | |
856bbc81 | 509 | GCPRO1 (args); |
856bbc81 | 510 | eval_sub (XCAR (args)); |
a63df926 PE |
511 | UNGCPRO; |
512 | return Fprog1 (XCDR (args)); | |
db9f0278 JB |
513 | } |
514 | ||
515 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
516 | doc: /* Set each SYM to the value of its VAL. |
517 | The symbols SYM are variables; they are literal (not evaluated). | |
518 | The values VAL are expressions; they are evaluated. | |
519 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
520 | The second VAL is not computed until after the first SYM is set, and so on; | |
521 | each VAL can use the new value of variables set earlier in the `setq'. | |
522 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 523 | usage: (setq [SYM VAL]...) */) |
5842a27b | 524 | (Lisp_Object args) |
db9f0278 | 525 | { |
16b0520a | 526 | Lisp_Object val, sym, lex_binding; |
db9f0278 | 527 | |
16b0520a PE |
528 | val = args; |
529 | if (CONSP (args)) | |
530 | { | |
531 | Lisp_Object args_left = args; | |
532 | struct gcpro gcpro1; | |
533 | GCPRO1 (args); | |
db9f0278 | 534 | |
16b0520a PE |
535 | do |
536 | { | |
537 | val = eval_sub (Fcar (XCDR (args_left))); | |
538 | sym = XCAR (args_left); | |
539 | ||
540 | /* Like for eval_sub, we do not check declared_special here since | |
541 | it's been done when let-binding. */ | |
542 | if (!NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
543 | && SYMBOLP (sym) | |
544 | && !NILP (lex_binding | |
545 | = Fassq (sym, Vinternal_interpreter_environment))) | |
546 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ | |
547 | else | |
548 | Fset (sym, val); /* SYM is dynamically bound. */ | |
db9f0278 | 549 | |
16b0520a PE |
550 | args_left = Fcdr (XCDR (args_left)); |
551 | } | |
552 | while (CONSP (args_left)); | |
b9598260 | 553 | |
16b0520a | 554 | UNGCPRO; |
db9f0278 | 555 | } |
db9f0278 | 556 | |
db9f0278 JB |
557 | return val; |
558 | } | |
177c0ea7 | 559 | |
db9f0278 | 560 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 | 561 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
91a15bc6 SM |
562 | Warning: `quote' does not construct its return value, but just returns |
563 | the value that was pre-constructed by the Lisp reader (see info node | |
564 | `(elisp)Printed Representation'). | |
565 | This means that '(a . b) is not identical to (cons 'a 'b): the former | |
566 | does not cons. Quoting should be reserved for constants that will | |
567 | never be modified by side-effects, unless you like self-modifying code. | |
568 | See the common pitfall in info node `(elisp)Rearrangement' for an example | |
569 | of unexpected results when a quoted object is modified. | |
9dbc9081 | 570 | usage: (quote ARG) */) |
5842a27b | 571 | (Lisp_Object args) |
db9f0278 | 572 | { |
16b0520a | 573 | if (CONSP (XCDR (args))) |
1283140e | 574 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); |
16b0520a | 575 | return XCAR (args); |
db9f0278 | 576 | } |
177c0ea7 | 577 | |
db9f0278 | 578 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
579 | doc: /* Like `quote', but preferred for objects which are functions. |
580 | In byte compilation, `function' causes its argument to be compiled. | |
581 | `quote' cannot do that. | |
582 | usage: (function ARG) */) | |
5842a27b | 583 | (Lisp_Object args) |
db9f0278 | 584 | { |
b9598260 SM |
585 | Lisp_Object quoted = XCAR (args); |
586 | ||
16b0520a | 587 | if (CONSP (XCDR (args))) |
1283140e | 588 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); |
b9598260 SM |
589 | |
590 | if (!NILP (Vinternal_interpreter_environment) | |
591 | && CONSP (quoted) | |
592 | && EQ (XCAR (quoted), Qlambda)) | |
593 | /* This is a lambda expression within a lexical environment; | |
594 | return an interpreted closure instead of a simple lambda. */ | |
23aba0ea SM |
595 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, |
596 | XCDR (quoted))); | |
b9598260 SM |
597 | else |
598 | /* Simply quote the argument. */ | |
599 | return quoted; | |
db9f0278 JB |
600 | } |
601 | ||
e0f331ab | 602 | |
1848d15d | 603 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 604 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 605 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 606 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
607 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
608 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
609 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
610 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 611 | The return value is BASE-VARIABLE. */) |
5842a27b | 612 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
613 | { |
614 | struct Lisp_Symbol *sym; | |
1848d15d | 615 | |
4a9308b8 JB |
616 | CHECK_SYMBOL (new_alias); |
617 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 618 | |
4a9308b8 | 619 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
620 | |
621 | if (sym->constant) | |
178f2507 SM |
622 | /* Not sure why, but why not? */ |
623 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
624 | |
625 | switch (sym->redirect) | |
626 | { | |
627 | case SYMBOL_FORWARDED: | |
628 | error ("Cannot make an internal variable an alias"); | |
629 | case SYMBOL_LOCALIZED: | |
630 | error ("Don't know how to make a localized variable an alias"); | |
631 | } | |
632 | ||
dd60787c | 633 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
634 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
635 | so that old-code that affects n_a before the aliasing is setup | |
636 | still works. */ | |
637 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 638 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
639 | |
640 | { | |
9349e5f7 | 641 | union specbinding *p; |
ce5b453a | 642 | |
bc985141 | 643 | for (p = specpdl_ptr; p > specpdl; ) |
2f592f95 SM |
644 | if ((--p)->kind >= SPECPDL_LET |
645 | && (EQ (new_alias, specpdl_symbol (p)))) | |
ce5b453a SM |
646 | error ("Don't know how to make a let-bound variable an alias"); |
647 | } | |
648 | ||
b9598260 | 649 | sym->declared_special = 1; |
0ac30604 | 650 | XSYMBOL (base_variable)->declared_special = 1; |
ce5b453a SM |
651 | sym->redirect = SYMBOL_VARALIAS; |
652 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
653 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
654 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
655 | /* Even if docstring is nil: remove old docstring. */ |
656 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 657 | |
4a9308b8 | 658 | return base_variable; |
19cebf5a GM |
659 | } |
660 | ||
661 | ||
db9f0278 | 662 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 663 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
c3a70e2b CY |
664 | You are not required to define a variable in order to use it, but |
665 | defining it lets you supply an initial value and documentation, which | |
666 | can be referred to by the Emacs help facilities and other programming | |
667 | tools. The `defvar' form also declares the variable as \"special\", | |
668 | so that it is always dynamically bound even if `lexical-binding' is t. | |
669 | ||
670 | The optional argument INITVALUE is evaluated, and used to set SYMBOL, | |
671 | only if SYMBOL's value is void. If SYMBOL is buffer-local, its | |
672 | default value is what is set; buffer-local values are not affected. | |
9dbc9081 | 673 | If INITVALUE is missing, SYMBOL's value is not set. |
733f68b6 LT |
674 | |
675 | If SYMBOL has a local binding, then this form affects the local | |
676 | binding. This is usually not what you want. Thus, if you need to | |
677 | load a file defining variables, with this form or with `defconst' or | |
678 | `defcustom', you should always load that file _outside_ any bindings | |
679 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
680 | this respect.) | |
c3a70e2b CY |
681 | |
682 | The optional argument DOCSTRING is a documentation string for the | |
683 | variable. | |
684 | ||
685 | To define a user option, use `defcustom' instead of `defvar'. | |
2df5238c | 686 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 687 | (Lisp_Object args) |
db9f0278 | 688 | { |
16b0520a | 689 | Lisp_Object sym, tem, tail; |
db9f0278 | 690 | |
16b0520a PE |
691 | sym = XCAR (args); |
692 | tail = XCDR (args); | |
a42ba017 | 693 | |
16b0520a | 694 | if (CONSP (tail)) |
db9f0278 | 695 | { |
16b0520a PE |
696 | if (CONSP (XCDR (tail)) && CONSP (XCDR (XCDR (tail)))) |
697 | error ("Too many arguments"); | |
698 | ||
699 | tem = Fdefault_boundp (sym); | |
700 | ||
ba83908c SM |
701 | /* Do it before evaluating the initial value, for self-references. */ |
702 | XSYMBOL (sym)->declared_special = 1; | |
590130fb | 703 | |
265a9e55 | 704 | if (NILP (tem)) |
16b0520a | 705 | Fset_default (sym, eval_sub (XCAR (tail))); |
d0bce91e SM |
706 | else |
707 | { /* Check if there is really a global binding rather than just a let | |
708 | binding that shadows the global unboundness of the var. */ | |
9349e5f7 | 709 | union specbinding *pdl = specpdl_ptr; |
d311d28c | 710 | while (pdl > specpdl) |
d0bce91e | 711 | { |
2f592f95 SM |
712 | if ((--pdl)->kind >= SPECPDL_LET |
713 | && EQ (specpdl_symbol (pdl), sym) | |
714 | && EQ (specpdl_old_value (pdl), Qunbound)) | |
d0bce91e | 715 | { |
23ba2705 SM |
716 | message_with_string |
717 | ("Warning: defvar ignored because %s is let-bound", | |
718 | SYMBOL_NAME (sym), 1); | |
d0bce91e SM |
719 | break; |
720 | } | |
721 | } | |
722 | } | |
16b0520a | 723 | tail = XCDR (tail); |
e509f168 SM |
724 | tem = Fcar (tail); |
725 | if (!NILP (tem)) | |
33568849 | 726 | { |
33568849 SM |
727 | if (!NILP (Vpurify_flag)) |
728 | tem = Fpurecopy (tem); | |
729 | Fput (sym, Qvariable_documentation, tem); | |
730 | } | |
6fd797f5 | 731 | LOADHIST_ATTACH (sym); |
db9f0278 | 732 | } |
f07a954e SM |
733 | else if (!NILP (Vinternal_interpreter_environment) |
734 | && !XSYMBOL (sym)->declared_special) | |
735 | /* A simple (defvar foo) with lexical scoping does "nothing" except | |
736 | declare that var to be dynamically scoped *locally* (i.e. within | |
737 | the current file or let-block). */ | |
23ba2705 SM |
738 | Vinternal_interpreter_environment |
739 | = Fcons (sym, Vinternal_interpreter_environment); | |
33568849 | 740 | else |
d28a2170 PE |
741 | { |
742 | /* Simple (defvar <var>) should not count as a definition at all. | |
743 | It could get in the way of other definitions, and unloading this | |
744 | package could try to make the variable unbound. */ | |
745 | } | |
addf35fd | 746 | |
db9f0278 JB |
747 | return sym; |
748 | } | |
749 | ||
750 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 | 751 | doc: /* Define SYMBOL as a constant variable. |
c3a70e2b CY |
752 | This declares that neither programs nor users should ever change the |
753 | value. This constancy is not actually enforced by Emacs Lisp, but | |
754 | SYMBOL is marked as a special variable so that it is never lexically | |
755 | bound. | |
756 | ||
757 | The `defconst' form always sets the value of SYMBOL to the result of | |
758 | evalling INITVALUE. If SYMBOL is buffer-local, its default value is | |
759 | what is set; buffer-local values are not affected. If SYMBOL has a | |
760 | local binding, then this form sets the local binding's value. | |
761 | However, you should normally not make local bindings for variables | |
762 | defined with this form. | |
763 | ||
764 | The optional DOCSTRING specifies the variable's documentation string. | |
7a25dc6d | 765 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 766 | (Lisp_Object args) |
db9f0278 | 767 | { |
16b0520a | 768 | Lisp_Object sym, tem; |
db9f0278 | 769 | |
16b0520a PE |
770 | sym = XCAR (args); |
771 | if (CONSP (Fcdr (XCDR (XCDR (args))))) | |
921baa95 | 772 | error ("Too many arguments"); |
a42ba017 | 773 | |
16b0520a | 774 | tem = eval_sub (Fcar (XCDR (args))); |
1182a7cb DL |
775 | if (!NILP (Vpurify_flag)) |
776 | tem = Fpurecopy (tem); | |
777 | Fset_default (sym, tem); | |
b9598260 | 778 | XSYMBOL (sym)->declared_special = 1; |
16b0520a | 779 | tem = Fcar (XCDR (XCDR (args))); |
265a9e55 | 780 | if (!NILP (tem)) |
db9f0278 | 781 | { |
265a9e55 | 782 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
783 | tem = Fpurecopy (tem); |
784 | Fput (sym, Qvariable_documentation, tem); | |
785 | } | |
873759d5 | 786 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 787 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
788 | return sym; |
789 | } | |
790 | ||
513749ee SM |
791 | /* Make SYMBOL lexically scoped. */ |
792 | DEFUN ("internal-make-var-non-special", Fmake_var_non_special, | |
793 | Smake_var_non_special, 1, 1, 0, | |
794 | doc: /* Internal function. */) | |
795 | (Lisp_Object symbol) | |
796 | { | |
797 | CHECK_SYMBOL (symbol); | |
798 | XSYMBOL (symbol)->declared_special = 0; | |
799 | return Qnil; | |
800 | } | |
801 | ||
db9f0278 JB |
802 | \f |
803 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
804 | doc: /* Bind variables according to VARLIST then eval BODY. |
805 | The value of the last form in BODY is returned. | |
806 | Each element of VARLIST is a symbol (which is bound to nil) | |
807 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
808 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 809 | usage: (let* VARLIST BODY...) */) |
5842a27b | 810 | (Lisp_Object args) |
db9f0278 | 811 | { |
b9598260 | 812 | Lisp_Object varlist, var, val, elt, lexenv; |
d311d28c | 813 | ptrdiff_t count = SPECPDL_INDEX (); |
db9f0278 JB |
814 | struct gcpro gcpro1, gcpro2, gcpro3; |
815 | ||
816 | GCPRO3 (args, elt, varlist); | |
817 | ||
b9598260 SM |
818 | lexenv = Vinternal_interpreter_environment; |
819 | ||
16b0520a | 820 | varlist = XCAR (args); |
b9598260 | 821 | while (CONSP (varlist)) |
db9f0278 JB |
822 | { |
823 | QUIT; | |
b9598260 SM |
824 | |
825 | elt = XCAR (varlist); | |
90165123 | 826 | if (SYMBOLP (elt)) |
b9598260 SM |
827 | { |
828 | var = elt; | |
829 | val = Qnil; | |
830 | } | |
08564963 | 831 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 832 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
833 | else |
834 | { | |
b9598260 | 835 | var = Fcar (elt); |
defb1411 | 836 | val = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 | 837 | } |
b9598260 | 838 | |
f07a954e SM |
839 | if (!NILP (lexenv) && SYMBOLP (var) |
840 | && !XSYMBOL (var)->declared_special | |
841 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
842 | /* Lexically bind VAR by adding it to the interpreter's binding |
843 | alist. */ | |
844 | { | |
f07a954e SM |
845 | Lisp_Object newenv |
846 | = Fcons (Fcons (var, val), Vinternal_interpreter_environment); | |
847 | if (EQ (Vinternal_interpreter_environment, lexenv)) | |
848 | /* Save the old lexical environment on the specpdl stack, | |
849 | but only for the first lexical binding, since we'll never | |
850 | need to revert to one of the intermediate ones. */ | |
851 | specbind (Qinternal_interpreter_environment, newenv); | |
852 | else | |
853 | Vinternal_interpreter_environment = newenv; | |
db9f0278 | 854 | } |
b9598260 SM |
855 | else |
856 | specbind (var, val); | |
857 | ||
858 | varlist = XCDR (varlist); | |
db9f0278 JB |
859 | } |
860 | UNGCPRO; | |
16b0520a | 861 | val = Fprogn (XCDR (args)); |
db9f0278 JB |
862 | return unbind_to (count, val); |
863 | } | |
864 | ||
865 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
866 | doc: /* Bind variables according to VARLIST then eval BODY. |
867 | The value of the last form in BODY is returned. | |
868 | Each element of VARLIST is a symbol (which is bound to nil) | |
869 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
870 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 871 | usage: (let VARLIST BODY...) */) |
5842a27b | 872 | (Lisp_Object args) |
db9f0278 | 873 | { |
b9598260 | 874 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 875 | register Lisp_Object elt, varlist; |
d311d28c | 876 | ptrdiff_t count = SPECPDL_INDEX (); |
f66c7cf8 | 877 | ptrdiff_t argnum; |
db9f0278 | 878 | struct gcpro gcpro1, gcpro2; |
3a7a9129 | 879 | USE_SAFE_ALLOCA; |
db9f0278 | 880 | |
16b0520a | 881 | varlist = XCAR (args); |
db9f0278 | 882 | |
f6d62986 | 883 | /* Make space to hold the values to give the bound variables. */ |
db9f0278 | 884 | elt = Flength (varlist); |
b72e0717 | 885 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 | 886 | |
f6d62986 | 887 | /* Compute the values and store them in `temps'. */ |
db9f0278 JB |
888 | |
889 | GCPRO2 (args, *temps); | |
890 | gcpro2.nvars = 0; | |
891 | ||
67ee9f6e | 892 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
893 | { |
894 | QUIT; | |
67ee9f6e | 895 | elt = XCAR (varlist); |
90165123 | 896 | if (SYMBOLP (elt)) |
db9f0278 | 897 | temps [argnum++] = Qnil; |
08564963 | 898 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 899 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 | 900 | else |
defb1411 | 901 | temps [argnum++] = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 JB |
902 | gcpro2.nvars = argnum; |
903 | } | |
904 | UNGCPRO; | |
905 | ||
b9598260 SM |
906 | lexenv = Vinternal_interpreter_environment; |
907 | ||
16b0520a | 908 | varlist = XCAR (args); |
67ee9f6e | 909 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 910 | { |
b9598260 SM |
911 | Lisp_Object var; |
912 | ||
67ee9f6e | 913 | elt = XCAR (varlist); |
b9598260 | 914 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 915 | tem = temps[argnum++]; |
b9598260 | 916 | |
f07a954e SM |
917 | if (!NILP (lexenv) && SYMBOLP (var) |
918 | && !XSYMBOL (var)->declared_special | |
919 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
920 | /* Lexically bind VAR by adding it to the lexenv alist. */ |
921 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 922 | else |
b9598260 SM |
923 | /* Dynamically bind VAR. */ |
924 | specbind (var, tem); | |
db9f0278 JB |
925 | } |
926 | ||
b9598260 SM |
927 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
928 | /* Instantiate a new lexical environment. */ | |
929 | specbind (Qinternal_interpreter_environment, lexenv); | |
930 | ||
16b0520a | 931 | elt = Fprogn (XCDR (args)); |
3a7a9129 | 932 | SAFE_FREE (); |
db9f0278 JB |
933 | return unbind_to (count, elt); |
934 | } | |
935 | ||
936 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
937 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
938 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
939 | until TEST returns nil. | |
7a25dc6d | 940 | usage: (while TEST BODY...) */) |
5842a27b | 941 | (Lisp_Object args) |
db9f0278 | 942 | { |
2b9bde76 | 943 | Lisp_Object test, body; |
db9f0278 JB |
944 | struct gcpro gcpro1, gcpro2; |
945 | ||
946 | GCPRO2 (test, body); | |
947 | ||
16b0520a PE |
948 | test = XCAR (args); |
949 | body = XCDR (args); | |
defb1411 | 950 | while (!NILP (eval_sub (test))) |
db9f0278 JB |
951 | { |
952 | QUIT; | |
953 | Fprogn (body); | |
954 | } | |
955 | ||
956 | UNGCPRO; | |
957 | return Qnil; | |
958 | } | |
959 | ||
960 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
961 | doc: /* Return result of expanding macros at top level of FORM. |
962 | If FORM is not a macro call, it is returned unchanged. | |
963 | Otherwise, the macro is expanded and the expansion is considered | |
964 | in place of FORM. When a non-macro-call results, it is returned. | |
965 | ||
966 | The second optional arg ENVIRONMENT specifies an environment of macro | |
967 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 968 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 969 | { |
23d6b5a6 | 970 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
971 | register Lisp_Object expander, sym, def, tem; |
972 | ||
973 | while (1) | |
974 | { | |
975 | /* Come back here each time we expand a macro call, | |
976 | in case it expands into another macro call. */ | |
90165123 | 977 | if (!CONSP (form)) |
db9f0278 | 978 | break; |
23d6b5a6 | 979 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 980 | def = sym = XCAR (form); |
23d6b5a6 | 981 | tem = Qnil; |
db9f0278 JB |
982 | /* Trace symbols aliases to other symbols |
983 | until we get a symbol that is not an alias. */ | |
90165123 | 984 | while (SYMBOLP (def)) |
db9f0278 JB |
985 | { |
986 | QUIT; | |
23d6b5a6 | 987 | sym = def; |
79e8bfbf | 988 | tem = Fassq (sym, environment); |
265a9e55 | 989 | if (NILP (tem)) |
db9f0278 | 990 | { |
c644523b | 991 | def = XSYMBOL (sym)->function; |
eadf1faa | 992 | if (!NILP (def)) |
23d6b5a6 | 993 | continue; |
db9f0278 | 994 | } |
23d6b5a6 | 995 | break; |
db9f0278 | 996 | } |
79e8bfbf | 997 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 998 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 999 | if (NILP (tem)) |
db9f0278 | 1000 | { |
79e8bfbf | 1001 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1002 | Look at its function definition. */ |
7abaf5cc SM |
1003 | struct gcpro gcpro1; |
1004 | GCPRO1 (form); | |
1005 | def = Fautoload_do_load (def, sym, Qmacro); | |
1006 | UNGCPRO; | |
eadf1faa | 1007 | if (!CONSP (def)) |
f6d62986 | 1008 | /* Not defined or definition not suitable. */ |
db9f0278 | 1009 | break; |
7abaf5cc | 1010 | if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1011 | break; |
03699b14 | 1012 | else expander = XCDR (def); |
db9f0278 JB |
1013 | } |
1014 | else | |
1015 | { | |
03699b14 | 1016 | expander = XCDR (tem); |
265a9e55 | 1017 | if (NILP (expander)) |
db9f0278 JB |
1018 | break; |
1019 | } | |
4f18a4ed SM |
1020 | { |
1021 | Lisp_Object newform = apply1 (expander, XCDR (form)); | |
1022 | if (EQ (form, newform)) | |
1023 | break; | |
1024 | else | |
1025 | form = newform; | |
1026 | } | |
db9f0278 JB |
1027 | } |
1028 | return form; | |
1029 | } | |
1030 | \f | |
1031 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1032 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1033 | TAG is evalled to get the tag to use; it must not be nil. | |
1034 | ||
1035 | Then the BODY is executed. | |
1d632ccf | 1036 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1037 | If no throw happens, `catch' returns the value of the last BODY form. |
1038 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1039 | usage: (catch TAG BODY...) */) |
5842a27b | 1040 | (Lisp_Object args) |
db9f0278 JB |
1041 | { |
1042 | register Lisp_Object tag; | |
1043 | struct gcpro gcpro1; | |
1044 | ||
1045 | GCPRO1 (args); | |
16b0520a | 1046 | tag = eval_sub (XCAR (args)); |
db9f0278 | 1047 | UNGCPRO; |
16b0520a | 1048 | return internal_catch (tag, Fprogn, XCDR (args)); |
db9f0278 JB |
1049 | } |
1050 | ||
1051 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1052 | FUNC should return a Lisp_Object. | |
2f592f95 | 1053 | This is how catches are done from within C code. */ |
db9f0278 JB |
1054 | |
1055 | Lisp_Object | |
d3da34e0 | 1056 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1057 | { |
1058 | /* This structure is made part of the chain `catchlist'. */ | |
1059 | struct catchtag c; | |
1060 | ||
1061 | /* Fill in the components of c, and put it on the list. */ | |
1062 | c.next = catchlist; | |
1063 | c.tag = tag; | |
1064 | c.val = Qnil; | |
db9f0278 JB |
1065 | c.handlerlist = handlerlist; |
1066 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1067 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1068 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1069 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1070 | c.gcpro = gcprolist; |
bcf28080 | 1071 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1072 | catchlist = &c; |
1073 | ||
1074 | /* Call FUNC. */ | |
0328b6de | 1075 | if (! sys_setjmp (c.jmp)) |
db9f0278 JB |
1076 | c.val = (*func) (arg); |
1077 | ||
1078 | /* Throw works by a longjmp that comes right here. */ | |
1079 | catchlist = c.next; | |
1080 | return c.val; | |
1081 | } | |
1082 | ||
ba410f40 JB |
1083 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1084 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1085 | |
4d7e6e51 | 1086 | This is the guts of Fthrow and Fsignal; they differ only in the way |
ba410f40 JB |
1087 | they choose the catch tag to throw to. A catch tag for a |
1088 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1089 | |
ba410f40 JB |
1090 | Before each catch is discarded, unbind all special bindings and |
1091 | execute all unwind-protect clauses made above that catch. Unwind | |
1092 | the handler stack as we go, so that the proper handlers are in | |
1093 | effect for each unwind-protect clause we run. At the end, restore | |
1094 | some static info saved in CATCH, and longjmp to the location | |
4d7e6e51 | 1095 | specified there. |
ba410f40 JB |
1096 | |
1097 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 | 1098 | |
845ca893 | 1099 | static _Noreturn void |
d3da34e0 | 1100 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 | 1101 | { |
1882aa38 | 1102 | bool last_time; |
db9f0278 | 1103 | |
ba410f40 JB |
1104 | /* Save the value in the tag. */ |
1105 | catch->val = value; | |
1106 | ||
0b31741c | 1107 | /* Restore certain special C variables. */ |
1cdc3155 | 1108 | set_poll_suppress_count (catch->poll_suppress_count); |
4d7e6e51 | 1109 | unblock_input_to (catch->interrupt_input_blocked); |
69bbd6bd | 1110 | immediate_quit = 0; |
82da7701 | 1111 | |
db9f0278 JB |
1112 | do |
1113 | { | |
1114 | last_time = catchlist == catch; | |
82da7701 JB |
1115 | |
1116 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1117 | handlers. */ |
db9f0278 JB |
1118 | unbind_to (catchlist->pdlcount, Qnil); |
1119 | handlerlist = catchlist->handlerlist; | |
1120 | catchlist = catchlist->next; | |
1121 | } | |
1122 | while (! last_time); | |
1123 | ||
bcf28080 | 1124 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1125 | gcprolist = catch->gcpro; |
15934ffa | 1126 | #ifdef DEBUG_GCPRO |
d8e2b5ba | 1127 | gcpro_level = gcprolist ? gcprolist->level + 1 : 0; |
15934ffa | 1128 | #endif |
db9f0278 | 1129 | lisp_eval_depth = catch->lisp_eval_depth; |
177c0ea7 | 1130 | |
0328b6de | 1131 | sys_longjmp (catch->jmp, 1); |
db9f0278 JB |
1132 | } |
1133 | ||
a7ca3326 | 1134 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, |
9dbc9081 PJ |
1135 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1136 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1137 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1138 | { |
1139 | register struct catchtag *c; | |
1140 | ||
8788120f KS |
1141 | if (!NILP (tag)) |
1142 | for (c = catchlist; c; c = c->next) | |
1143 | { | |
1144 | if (EQ (c->tag, tag)) | |
1145 | unwind_to_catch (c, value); | |
1146 | } | |
734d55a2 | 1147 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1148 | } |
1149 | ||
1150 | ||
1151 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1152 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1153 | If BODYFORM completes normally, its value is returned | |
1154 | after executing the UNWINDFORMS. | |
1155 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1156 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1157 | (Lisp_Object args) |
db9f0278 JB |
1158 | { |
1159 | Lisp_Object val; | |
d311d28c | 1160 | ptrdiff_t count = SPECPDL_INDEX (); |
db9f0278 | 1161 | |
16b0520a PE |
1162 | record_unwind_protect (unwind_body, XCDR (args)); |
1163 | val = eval_sub (XCAR (args)); | |
177c0ea7 | 1164 | return unbind_to (count, val); |
db9f0278 JB |
1165 | } |
1166 | \f | |
db9f0278 | 1167 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, |
9dbc9081 | 1168 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1169 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1170 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1171 | where the BODY is made of Lisp expressions. | |
1172 | ||
1173 | A handler is applicable to an error | |
1174 | if CONDITION-NAME is one of the error's condition names. | |
1175 | If an error happens, the first applicable handler is run. | |
1176 | ||
024a2d76 CY |
1177 | The car of a handler may be a list of condition names instead of a |
1178 | single condition name; then it handles all of them. If the special | |
1179 | condition name `debug' is present in this list, it allows another | |
1180 | condition in the list to run the debugger if `debug-on-error' and the | |
1181 | other usual mechanisms says it should (otherwise, `condition-case' | |
1182 | suppresses the debugger). | |
9dbc9081 | 1183 | |
c997bb25 RS |
1184 | When a handler handles an error, control returns to the `condition-case' |
1185 | and it executes the handler's BODY... | |
d0acbbaf | 1186 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1187 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1188 | Then the value of the last BODY form is returned from the `condition-case' |
1189 | expression. | |
9dbc9081 | 1190 | |
9dbc9081 | 1191 | See also the function `signal' for more info. |
2b47b74d | 1192 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1193 | (Lisp_Object args) |
db9f0278 | 1194 | { |
16b0520a PE |
1195 | Lisp_Object var = XCAR (args); |
1196 | Lisp_Object bodyform = XCAR (XCDR (args)); | |
1197 | Lisp_Object handlers = XCDR (XCDR (args)); | |
ee830945 RS |
1198 | |
1199 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1200 | } | |
1201 | ||
1202 | /* Like Fcondition_case, but the args are separate | |
1203 | rather than passed in a list. Used by Fbyte_code. */ | |
1204 | ||
1205 | Lisp_Object | |
d3da34e0 JB |
1206 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1207 | Lisp_Object handlers) | |
ee830945 RS |
1208 | { |
1209 | Lisp_Object val; | |
1210 | struct catchtag c; | |
1211 | struct handler h; | |
1212 | ||
b7826503 | 1213 | CHECK_SYMBOL (var); |
82da7701 | 1214 | |
2b47b74d | 1215 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1216 | { |
1217 | Lisp_Object tem; | |
2b47b74d | 1218 | tem = XCAR (val); |
5f96776a RS |
1219 | if (! (NILP (tem) |
1220 | || (CONSP (tem) | |
03699b14 KR |
1221 | && (SYMBOLP (XCAR (tem)) |
1222 | || CONSP (XCAR (tem)))))) | |
e6c3da20 EZ |
1223 | error ("Invalid condition handler: %s", |
1224 | SDATA (Fprin1_to_string (tem, Qt))); | |
82da7701 | 1225 | } |
db9f0278 JB |
1226 | |
1227 | c.tag = Qnil; | |
1228 | c.val = Qnil; | |
db9f0278 JB |
1229 | c.handlerlist = handlerlist; |
1230 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1231 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1232 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1233 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1234 | c.gcpro = gcprolist; |
bcf28080 | 1235 | c.byte_stack = byte_stack_list; |
0328b6de | 1236 | if (sys_setjmp (c.jmp)) |
db9f0278 | 1237 | { |
265a9e55 | 1238 | if (!NILP (h.var)) |
bb8e180f | 1239 | specbind (h.var, c.val); |
9d58218c | 1240 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1241 | |
1242 | /* Note that this just undoes the binding of h.var; whoever | |
1243 | longjumped to us unwound the stack to c.pdlcount before | |
2f592f95 | 1244 | throwing. */ |
db9f0278 JB |
1245 | unbind_to (c.pdlcount, Qnil); |
1246 | return val; | |
1247 | } | |
1248 | c.next = catchlist; | |
1249 | catchlist = &c; | |
177c0ea7 | 1250 | |
82da7701 JB |
1251 | h.var = var; |
1252 | h.handler = handlers; | |
db9f0278 | 1253 | h.next = handlerlist; |
db9f0278 JB |
1254 | h.tag = &c; |
1255 | handlerlist = &h; | |
1256 | ||
defb1411 | 1257 | val = eval_sub (bodyform); |
db9f0278 JB |
1258 | catchlist = c.next; |
1259 | handlerlist = h.next; | |
1260 | return val; | |
1261 | } | |
1262 | ||
f029ca5f RS |
1263 | /* Call the function BFUN with no arguments, catching errors within it |
1264 | according to HANDLERS. If there is an error, call HFUN with | |
1265 | one argument which is the data that describes the error: | |
1266 | (SIGNALNAME . DATA) | |
1267 | ||
1268 | HANDLERS can be a list of conditions to catch. | |
1269 | If HANDLERS is Qt, catch all errors. | |
1270 | If HANDLERS is Qerror, catch all errors | |
1271 | but allow the debugger to run if that is enabled. */ | |
1272 | ||
db9f0278 | 1273 | Lisp_Object |
d3da34e0 JB |
1274 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1275 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1276 | { |
1277 | Lisp_Object val; | |
1278 | struct catchtag c; | |
1279 | struct handler h; | |
1280 | ||
1281 | c.tag = Qnil; | |
1282 | c.val = Qnil; | |
db9f0278 JB |
1283 | c.handlerlist = handlerlist; |
1284 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1285 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1286 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1287 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1288 | c.gcpro = gcprolist; |
bcf28080 | 1289 | c.byte_stack = byte_stack_list; |
0328b6de | 1290 | if (sys_setjmp (c.jmp)) |
db9f0278 | 1291 | { |
9d58218c | 1292 | return (*hfun) (c.val); |
db9f0278 JB |
1293 | } |
1294 | c.next = catchlist; | |
1295 | catchlist = &c; | |
1296 | h.handler = handlers; | |
1297 | h.var = Qnil; | |
db9f0278 JB |
1298 | h.next = handlerlist; |
1299 | h.tag = &c; | |
1300 | handlerlist = &h; | |
1301 | ||
1302 | val = (*bfun) (); | |
1303 | catchlist = c.next; | |
1304 | handlerlist = h.next; | |
1305 | return val; | |
1306 | } | |
1307 | ||
2659a09f | 1308 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1309 | |
d227775c | 1310 | Lisp_Object |
d3da34e0 JB |
1311 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1312 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1313 | { |
1314 | Lisp_Object val; | |
1315 | struct catchtag c; | |
1316 | struct handler h; | |
1317 | ||
1318 | c.tag = Qnil; | |
1319 | c.val = Qnil; | |
d227775c RS |
1320 | c.handlerlist = handlerlist; |
1321 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1322 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1323 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1324 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1325 | c.gcpro = gcprolist; |
bcf28080 | 1326 | c.byte_stack = byte_stack_list; |
0328b6de | 1327 | if (sys_setjmp (c.jmp)) |
d227775c | 1328 | { |
9d58218c | 1329 | return (*hfun) (c.val); |
d227775c RS |
1330 | } |
1331 | c.next = catchlist; | |
1332 | catchlist = &c; | |
1333 | h.handler = handlers; | |
1334 | h.var = Qnil; | |
1335 | h.next = handlerlist; | |
1336 | h.tag = &c; | |
1337 | handlerlist = &h; | |
1338 | ||
1339 | val = (*bfun) (arg); | |
1340 | catchlist = c.next; | |
1341 | handlerlist = h.next; | |
1342 | return val; | |
1343 | } | |
10b29d41 | 1344 | |
53967e09 CY |
1345 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1346 | its arguments. */ | |
1347 | ||
1348 | Lisp_Object | |
178f2507 SM |
1349 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1350 | Lisp_Object arg1, | |
1351 | Lisp_Object arg2, | |
1352 | Lisp_Object handlers, | |
1353 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1354 | { |
1355 | Lisp_Object val; | |
1356 | struct catchtag c; | |
1357 | struct handler h; | |
1358 | ||
53967e09 CY |
1359 | c.tag = Qnil; |
1360 | c.val = Qnil; | |
53967e09 CY |
1361 | c.handlerlist = handlerlist; |
1362 | c.lisp_eval_depth = lisp_eval_depth; | |
1363 | c.pdlcount = SPECPDL_INDEX (); | |
1364 | c.poll_suppress_count = poll_suppress_count; | |
1365 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1366 | c.gcpro = gcprolist; | |
1367 | c.byte_stack = byte_stack_list; | |
0328b6de | 1368 | if (sys_setjmp (c.jmp)) |
53967e09 CY |
1369 | { |
1370 | return (*hfun) (c.val); | |
1371 | } | |
1372 | c.next = catchlist; | |
1373 | catchlist = &c; | |
1374 | h.handler = handlers; | |
1375 | h.var = Qnil; | |
1376 | h.next = handlerlist; | |
1377 | h.tag = &c; | |
1378 | handlerlist = &h; | |
1379 | ||
1380 | val = (*bfun) (arg1, arg2); | |
1381 | catchlist = c.next; | |
1382 | handlerlist = h.next; | |
1383 | return val; | |
1384 | } | |
10b29d41 | 1385 | |
2659a09f | 1386 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1387 | and ARGS as second argument. */ |
1388 | ||
1389 | Lisp_Object | |
f66c7cf8 PE |
1390 | internal_condition_case_n (Lisp_Object (*bfun) (ptrdiff_t, Lisp_Object *), |
1391 | ptrdiff_t nargs, | |
178f2507 SM |
1392 | Lisp_Object *args, |
1393 | Lisp_Object handlers, | |
cc92c454 SM |
1394 | Lisp_Object (*hfun) (Lisp_Object err, |
1395 | ptrdiff_t nargs, | |
1396 | Lisp_Object *args)) | |
10b29d41 GM |
1397 | { |
1398 | Lisp_Object val; | |
1399 | struct catchtag c; | |
1400 | struct handler h; | |
1401 | ||
1402 | c.tag = Qnil; | |
1403 | c.val = Qnil; | |
10b29d41 GM |
1404 | c.handlerlist = handlerlist; |
1405 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1406 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1407 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1408 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1409 | c.gcpro = gcprolist; |
1410 | c.byte_stack = byte_stack_list; | |
0328b6de | 1411 | if (sys_setjmp (c.jmp)) |
10b29d41 | 1412 | { |
cc92c454 | 1413 | return (*hfun) (c.val, nargs, args); |
10b29d41 GM |
1414 | } |
1415 | c.next = catchlist; | |
1416 | catchlist = &c; | |
1417 | h.handler = handlers; | |
1418 | h.var = Qnil; | |
1419 | h.next = handlerlist; | |
1420 | h.tag = &c; | |
1421 | handlerlist = &h; | |
1422 | ||
1423 | val = (*bfun) (nargs, args); | |
1424 | catchlist = c.next; | |
1425 | handlerlist = h.next; | |
1426 | return val; | |
1427 | } | |
1428 | ||
d227775c | 1429 | \f |
7d47b580 | 1430 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object); |
1882aa38 PE |
1431 | static bool maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1432 | Lisp_Object data); | |
db9f0278 | 1433 | |
6d5eb5b0 SM |
1434 | void |
1435 | process_quit_flag (void) | |
1436 | { | |
1437 | Lisp_Object flag = Vquit_flag; | |
1438 | Vquit_flag = Qnil; | |
1439 | if (EQ (flag, Qkill_emacs)) | |
1440 | Fkill_emacs (Qnil); | |
1441 | if (EQ (Vthrow_on_input, flag)) | |
1442 | Fthrow (Vthrow_on_input, Qt); | |
1443 | Fsignal (Qquit, Qnil); | |
1444 | } | |
1445 | ||
a7ca3326 | 1446 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, |
9dbc9081 PJ |
1447 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1448 | This function does not return. | |
1449 | ||
1450 | An error symbol is a symbol with an `error-conditions' property | |
1451 | that is a list of condition names. | |
1452 | A handler for any of those names will get to handle this signal. | |
1453 | The symbol `error' should normally be one of them. | |
1454 | ||
1455 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1456 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1457 | error message is constructed. | |
9dbc9081 PJ |
1458 | If the signal is handled, DATA is made available to the handler. |
1459 | See also the function `condition-case'. */) | |
5842a27b | 1460 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1461 | { |
bfa8ca43 | 1462 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1463 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1464 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1465 | Lisp_Object conditions; |
c11d3d17 | 1466 | Lisp_Object string; |
e7f7fbaa SM |
1467 | Lisp_Object real_error_symbol |
1468 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1469 | register Lisp_Object clause = Qnil; | |
1470 | struct handler *h; | |
db9f0278 | 1471 | |
0caaedb1 | 1472 | immediate_quit = 0; |
d063129f | 1473 | abort_on_gc = 0; |
db9f0278 | 1474 | if (gc_in_progress || waiting_for_input) |
1088b922 | 1475 | emacs_abort (); |
db9f0278 | 1476 | |
26631f2b RS |
1477 | #if 0 /* rms: I don't know why this was here, |
1478 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1479 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1480 | if (display_hourglass_p) |
1481 | cancel_hourglass (); | |
48f8dfa3 | 1482 | #endif |
177c0ea7 | 1483 | #endif |
48f8dfa3 | 1484 | |
61ede770 | 1485 | /* This hook is used by edebug. */ |
26631f2b RS |
1486 | if (! NILP (Vsignal_hook_function) |
1487 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1488 | { |
1489 | /* Edebug takes care of restoring these variables when it exits. */ | |
1490 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1491 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1492 | ||
1493 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1494 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1495 | ||
1496 | call2 (Vsignal_hook_function, error_symbol, data); | |
1497 | } | |
61ede770 | 1498 | |
1ea9dec4 | 1499 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1500 | |
a2ff3819 GM |
1501 | /* Remember from where signal was called. Skip over the frame for |
1502 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1503 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1504 | is a memory-full error. */ | |
090a072f | 1505 | Vsignaling_function = Qnil; |
2f592f95 | 1506 | if (!NILP (error_symbol)) |
090a072f | 1507 | { |
9349e5f7 | 1508 | union specbinding *pdl = backtrace_next (backtrace_top ()); |
2f592f95 SM |
1509 | if (backtrace_p (pdl) && EQ (backtrace_function (pdl), Qerror)) |
1510 | pdl = backtrace_next (pdl); | |
1511 | if (backtrace_p (pdl)) | |
1512 | Vsignaling_function = backtrace_function (pdl); | |
090a072f | 1513 | } |
a2ff3819 | 1514 | |
e7f7fbaa | 1515 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1516 | { |
7d47b580 | 1517 | clause = find_handler_clause (h->handler, conditions); |
265a9e55 | 1518 | if (!NILP (clause)) |
e7f7fbaa | 1519 | break; |
db9f0278 | 1520 | } |
475545b5 | 1521 | |
e7f7fbaa | 1522 | if (/* Don't run the debugger for a memory-full error. |
e7c1b6ef | 1523 | (There is no room in memory to do that!) */ |
e7f7fbaa SM |
1524 | !NILP (error_symbol) |
1525 | && (!NILP (Vdebug_on_signal) | |
1526 | /* If no handler is present now, try to run the debugger. */ | |
1527 | || NILP (clause) | |
bd1ba3e8 CY |
1528 | /* A `debug' symbol in the handler list disables the normal |
1529 | suppression of the debugger. */ | |
1530 | || (CONSP (clause) && CONSP (XCAR (clause)) | |
1531 | && !NILP (Fmemq (Qdebug, XCAR (clause)))) | |
e7f7fbaa SM |
1532 | /* Special handler that means "print a message and run debugger |
1533 | if requested". */ | |
1534 | || EQ (h->handler, Qerror))) | |
1535 | { | |
1882aa38 | 1536 | bool debugger_called |
e7f7fbaa SM |
1537 | = maybe_call_debugger (conditions, error_symbol, data); |
1538 | /* We can't return values to code which signaled an error, but we | |
1539 | can continue code which has signaled a quit. */ | |
1540 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
1541 | return Qnil; | |
475545b5 | 1542 | } |
db9f0278 | 1543 | |
e7f7fbaa SM |
1544 | if (!NILP (clause)) |
1545 | { | |
1546 | Lisp_Object unwind_data | |
1547 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 1548 | |
e7f7fbaa SM |
1549 | h->chosen_clause = clause; |
1550 | unwind_to_catch (h->tag, unwind_data); | |
1551 | } | |
1552 | else | |
1553 | { | |
1554 | if (catchlist != 0) | |
1555 | Fthrow (Qtop_level, Qt); | |
1556 | } | |
c11d3d17 | 1557 | |
1ea9dec4 | 1558 | if (! NILP (error_symbol)) |
c11d3d17 | 1559 | data = Fcons (error_symbol, data); |
475545b5 | 1560 | |
c11d3d17 | 1561 | string = Ferror_message_string (data); |
583f48b9 | 1562 | fatal ("%s", SDATA (string)); |
db9f0278 JB |
1563 | } |
1564 | ||
734d55a2 KS |
1565 | /* Internal version of Fsignal that never returns. |
1566 | Used for anything but Qquit (which can return from Fsignal). */ | |
1567 | ||
1568 | void | |
d3da34e0 | 1569 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1570 | { |
1571 | Fsignal (error_symbol, data); | |
1088b922 | 1572 | emacs_abort (); |
734d55a2 KS |
1573 | } |
1574 | ||
1575 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1576 | ||
1577 | void | |
d3da34e0 | 1578 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1579 | { |
1580 | xsignal (error_symbol, Qnil); | |
1581 | } | |
1582 | ||
1583 | void | |
d3da34e0 | 1584 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1585 | { |
1586 | xsignal (error_symbol, list1 (arg)); | |
1587 | } | |
1588 | ||
1589 | void | |
d3da34e0 | 1590 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1591 | { |
1592 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1593 | } | |
1594 | ||
1595 | void | |
d3da34e0 | 1596 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1597 | { |
1598 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1599 | } | |
1600 | ||
1601 | /* Signal `error' with message S, and additional arg ARG. | |
1602 | If ARG is not a genuine list, make it a one-element list. */ | |
1603 | ||
1604 | void | |
a8fe7202 | 1605 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1606 | { |
1607 | Lisp_Object tortoise, hare; | |
1608 | ||
1609 | hare = tortoise = arg; | |
1610 | while (CONSP (hare)) | |
1611 | { | |
1612 | hare = XCDR (hare); | |
1613 | if (!CONSP (hare)) | |
1614 | break; | |
1615 | ||
1616 | hare = XCDR (hare); | |
1617 | tortoise = XCDR (tortoise); | |
1618 | ||
1619 | if (EQ (hare, tortoise)) | |
1620 | break; | |
1621 | } | |
1622 | ||
1623 | if (!NILP (hare)) | |
6c6f1994 | 1624 | arg = list1 (arg); |
734d55a2 KS |
1625 | |
1626 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1627 | } | |
1628 | ||
1629 | ||
1882aa38 | 1630 | /* Return true if LIST is a non-nil atom or |
128c0f66 RM |
1631 | a list containing one of CONDITIONS. */ |
1632 | ||
1882aa38 | 1633 | static bool |
d3da34e0 | 1634 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1635 | { |
4de86b16 | 1636 | if (NILP (list)) |
128c0f66 RM |
1637 | return 0; |
1638 | if (! CONSP (list)) | |
1639 | return 1; | |
1640 | ||
ab67260b | 1641 | while (CONSP (conditions)) |
128c0f66 | 1642 | { |
ab67260b | 1643 | Lisp_Object this, tail; |
03699b14 KR |
1644 | this = XCAR (conditions); |
1645 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1646 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1647 | return 1; |
03699b14 | 1648 | conditions = XCDR (conditions); |
128c0f66 | 1649 | } |
ab67260b | 1650 | return 0; |
128c0f66 RM |
1651 | } |
1652 | ||
1882aa38 | 1653 | /* Return true if an error with condition-symbols CONDITIONS, |
fc950e09 | 1654 | and described by SIGNAL-DATA, should skip the debugger |
1b1acc13 | 1655 | according to debugger-ignored-errors. */ |
fc950e09 | 1656 | |
1882aa38 | 1657 | static bool |
d3da34e0 | 1658 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1659 | { |
1660 | Lisp_Object tail; | |
1882aa38 | 1661 | bool first_string = 1; |
fc950e09 KH |
1662 | Lisp_Object error_message; |
1663 | ||
17401c97 GM |
1664 | error_message = Qnil; |
1665 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1666 | { |
03699b14 | 1667 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1668 | { |
1669 | if (first_string) | |
1670 | { | |
1671 | error_message = Ferror_message_string (data); | |
1672 | first_string = 0; | |
1673 | } | |
177c0ea7 | 1674 | |
03699b14 | 1675 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1676 | return 1; |
1677 | } | |
1678 | else | |
1679 | { | |
1680 | Lisp_Object contail; | |
1681 | ||
17401c97 | 1682 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1683 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1684 | return 1; |
1685 | } | |
1686 | } | |
1687 | ||
1688 | return 0; | |
1689 | } | |
1690 | ||
ddaa36e1 | 1691 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
7d47b580 JB |
1692 | SIG and DATA describe the signal. There are two ways to pass them: |
1693 | = SIG is the error symbol, and DATA is the rest of the data. | |
1694 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). | |
1695 | This is for memory-full errors only. */ | |
1882aa38 | 1696 | static bool |
d3da34e0 | 1697 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1698 | { |
1699 | Lisp_Object combined_data; | |
1700 | ||
1701 | combined_data = Fcons (sig, data); | |
1702 | ||
1703 | if ( | |
1704 | /* Don't try to run the debugger with interrupts blocked. | |
1705 | The editing loop would return anyway. */ | |
4d7e6e51 | 1706 | ! input_blocked_p () |
45b82ad0 | 1707 | && NILP (Vinhibit_debugger) |
ddaa36e1 AS |
1708 | /* Does user want to enter debugger for this kind of error? */ |
1709 | && (EQ (sig, Qquit) | |
1710 | ? debug_on_quit | |
1711 | : wants_debugger (Vdebug_on_error, conditions)) | |
1712 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1713 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1714 | && when_entered_debugger < num_nonmacro_input_events) |
1715 | { | |
6c6f1994 | 1716 | call_debugger (list2 (Qerror, combined_data)); |
ddaa36e1 AS |
1717 | return 1; |
1718 | } | |
1719 | ||
1720 | return 0; | |
1721 | } | |
1722 | ||
db9f0278 | 1723 | static Lisp_Object |
7d47b580 | 1724 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions) |
db9f0278 JB |
1725 | { |
1726 | register Lisp_Object h; | |
db9f0278 | 1727 | |
f01cbfdd RS |
1728 | /* t is used by handlers for all conditions, set up by C code. */ |
1729 | if (EQ (handlers, Qt)) | |
db9f0278 | 1730 | return Qt; |
f01cbfdd | 1731 | |
61ede770 RS |
1732 | /* error is used similarly, but means print an error message |
1733 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1734 | if (EQ (handlers, Qerror)) |
1735 | return Qt; | |
f01cbfdd | 1736 | |
e7f7fbaa | 1737 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1738 | { |
e7f7fbaa SM |
1739 | Lisp_Object handler = XCAR (h); |
1740 | Lisp_Object condit, tem; | |
5f96776a | 1741 | |
5f96776a | 1742 | if (!CONSP (handler)) |
db9f0278 | 1743 | continue; |
e7f7fbaa | 1744 | condit = XCAR (handler); |
5f96776a RS |
1745 | /* Handle a single condition name in handler HANDLER. */ |
1746 | if (SYMBOLP (condit)) | |
1747 | { | |
1748 | tem = Fmemq (Fcar (handler), conditions); | |
1749 | if (!NILP (tem)) | |
1750 | return handler; | |
1751 | } | |
1752 | /* Handle a list of condition names in handler HANDLER. */ | |
1753 | else if (CONSP (condit)) | |
1754 | { | |
f01cbfdd RS |
1755 | Lisp_Object tail; |
1756 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1757 | { |
e7f7fbaa | 1758 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1759 | if (!NILP (tem)) |
e7f7fbaa | 1760 | return handler; |
5f96776a RS |
1761 | } |
1762 | } | |
db9f0278 | 1763 | } |
f01cbfdd | 1764 | |
db9f0278 JB |
1765 | return Qnil; |
1766 | } | |
1767 | ||
db9f0278 | 1768 | |
f6d62986 | 1769 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1770 | void |
b3ffc17c | 1771 | verror (const char *m, va_list ap) |
db9f0278 | 1772 | { |
70476b54 | 1773 | char buf[4000]; |
c2d1e36d PE |
1774 | ptrdiff_t size = sizeof buf; |
1775 | ptrdiff_t size_max = STRING_BYTES_BOUND + 1; | |
9125da08 | 1776 | char *buffer = buf; |
c2d1e36d | 1777 | ptrdiff_t used; |
9125da08 RS |
1778 | Lisp_Object string; |
1779 | ||
d749b01b | 1780 | used = evxprintf (&buffer, &size, buf, size_max, m, ap); |
5fdb398c | 1781 | string = make_string (buffer, used); |
eb3f1cc8 | 1782 | if (buffer != buf) |
9ae6734f | 1783 | xfree (buffer); |
9125da08 | 1784 | |
734d55a2 | 1785 | xsignal1 (Qerror, string); |
db9f0278 | 1786 | } |
b3ffc17c DN |
1787 | |
1788 | ||
f6d62986 | 1789 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
1790 | |
1791 | /* VARARGS 1 */ | |
1792 | void | |
1793 | error (const char *m, ...) | |
1794 | { | |
1795 | va_list ap; | |
1796 | va_start (ap, m); | |
1797 | verror (m, ap); | |
b3ffc17c | 1798 | } |
db9f0278 | 1799 | \f |
a7ca3326 | 1800 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
1801 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
1802 | This means it contains a description for how to read arguments to give it. | |
1803 | The value is nil for an invalid function or a symbol with no function | |
1804 | definition. | |
1805 | ||
1806 | Interactively callable functions include strings and vectors (treated | |
1807 | as keyboard macros), lambda-expressions that contain a top-level call | |
1808 | to `interactive', autoload definitions made by `autoload' with non-nil | |
1809 | fourth argument, and some of the built-in functions of Lisp. | |
1810 | ||
e72706be RS |
1811 | Also, a symbol satisfies `commandp' if its function definition does so. |
1812 | ||
1813 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 1814 | then strings and vectors are not accepted. */) |
5842a27b | 1815 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
1816 | { |
1817 | register Lisp_Object fun; | |
1818 | register Lisp_Object funcar; | |
52b71f49 | 1819 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
1820 | |
1821 | fun = function; | |
1822 | ||
eadf1faa SM |
1823 | fun = indirect_function (fun); /* Check cycles. */ |
1824 | if (NILP (fun)) | |
ffd56f97 | 1825 | return Qnil; |
db9f0278 | 1826 | |
52b71f49 | 1827 | /* Check an `interactive-form' property if present, analogous to the |
eadf1faa | 1828 | function-documentation property. */ |
52b71f49 SM |
1829 | fun = function; |
1830 | while (SYMBOLP (fun)) | |
1831 | { | |
2b9aa051 | 1832 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
1833 | if (!NILP (tmp)) |
1834 | if_prop = Qt; | |
1835 | fun = Fsymbol_function (fun); | |
1836 | } | |
1837 | ||
db9f0278 JB |
1838 | /* Emacs primitives are interactive if their DEFUN specifies an |
1839 | interactive spec. */ | |
90165123 | 1840 | if (SUBRP (fun)) |
04724b69 | 1841 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
1842 | |
1843 | /* Bytecode objects are interactive if they are long enough to | |
1844 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1845 | where the interactive spec is stored. */ | |
90165123 | 1846 | else if (COMPILEDP (fun)) |
845975f5 | 1847 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 1848 | ? Qt : if_prop); |
db9f0278 JB |
1849 | |
1850 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 1851 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 1852 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
1853 | |
1854 | /* Lists may represent commands. */ | |
1855 | if (!CONSP (fun)) | |
1856 | return Qnil; | |
ed16fb98 | 1857 | funcar = XCAR (fun); |
b38b1ec0 | 1858 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
1859 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
1860 | ? Qt : if_prop); | |
23aba0ea | 1861 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 1862 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 1863 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 1864 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
1865 | else |
1866 | return Qnil; | |
1867 | } | |
1868 | ||
db9f0278 | 1869 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
1870 | doc: /* Define FUNCTION to autoload from FILE. |
1871 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
1872 | Third arg DOCSTRING is documentation for the function. | |
1873 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
1874 | Fifth arg TYPE indicates the type of the object: | |
1875 | nil or omitted says FUNCTION is a function, | |
1876 | `keymap' says FUNCTION is really a keymap, and | |
1877 | `macro' or t says FUNCTION is really a macro. | |
1878 | Third through fifth args give info about the real definition. | |
1879 | They default to nil. | |
1880 | If FUNCTION is already defined other than as an autoload, | |
1881 | this does nothing and returns nil. */) | |
5842a27b | 1882 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 1883 | { |
b7826503 PJ |
1884 | CHECK_SYMBOL (function); |
1885 | CHECK_STRING (file); | |
db9f0278 | 1886 | |
f6d62986 | 1887 | /* If function is defined and not as an autoload, don't override. */ |
eadf1faa | 1888 | if (!NILP (XSYMBOL (function)->function) |
32e5c58c | 1889 | && !AUTOLOADP (XSYMBOL (function)->function)) |
db9f0278 JB |
1890 | return Qnil; |
1891 | ||
32e5c58c | 1892 | if (!NILP (Vpurify_flag) && EQ (docstring, make_number (0))) |
61b108cc SM |
1893 | /* `read1' in lread.c has found the docstring starting with "\ |
1894 | and assumed the docstring will be provided by Snarf-documentation, so it | |
1895 | passed us 0 instead. But that leads to accidental sharing in purecopy's | |
1896 | hash-consing, so we use a (hopefully) unique integer instead. */ | |
32e5c58c SM |
1897 | docstring = make_number (XHASH (function)); |
1898 | return Fdefalias (function, | |
1899 | list5 (Qautoload, file, docstring, interactive, type), | |
1900 | Qnil); | |
db9f0278 JB |
1901 | } |
1902 | ||
27e498e6 | 1903 | void |
d3da34e0 | 1904 | un_autoload (Lisp_Object oldqueue) |
db9f0278 | 1905 | { |
27e498e6 | 1906 | Lisp_Object queue, first, second; |
db9f0278 JB |
1907 | |
1908 | /* Queue to unwind is current value of Vautoload_queue. | |
1909 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1910 | queue = Vautoload_queue; | |
1911 | Vautoload_queue = oldqueue; | |
1912 | while (CONSP (queue)) | |
1913 | { | |
e509f168 | 1914 | first = XCAR (queue); |
db9f0278 JB |
1915 | second = Fcdr (first); |
1916 | first = Fcar (first); | |
47b82df9 RS |
1917 | if (EQ (first, make_number (0))) |
1918 | Vfeatures = second; | |
db9f0278 JB |
1919 | else |
1920 | Ffset (first, second); | |
e509f168 | 1921 | queue = XCDR (queue); |
db9f0278 | 1922 | } |
db9f0278 JB |
1923 | } |
1924 | ||
ca20916b RS |
1925 | /* Load an autoloaded function. |
1926 | FUNNAME is the symbol which is the function's name. | |
1927 | FUNDEF is the autoload definition (a list). */ | |
1928 | ||
7abaf5cc SM |
1929 | DEFUN ("autoload-do-load", Fautoload_do_load, Sautoload_do_load, 1, 3, 0, |
1930 | doc: /* Load FUNDEF which should be an autoload. | |
1931 | If non-nil, FUNNAME should be the symbol whose function value is FUNDEF, | |
1932 | in which case the function returns the new autoloaded function value. | |
1933 | If equal to `macro', MACRO-ONLY specifies that FUNDEF should only be loaded if | |
1934 | it is defines a macro. */) | |
1935 | (Lisp_Object fundef, Lisp_Object funname, Lisp_Object macro_only) | |
db9f0278 | 1936 | { |
d311d28c | 1937 | ptrdiff_t count = SPECPDL_INDEX (); |
ca20916b | 1938 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 1939 | |
7abaf5cc SM |
1940 | if (!CONSP (fundef) || !EQ (Qautoload, XCAR (fundef))) |
1941 | return fundef; | |
1942 | ||
1943 | if (EQ (macro_only, Qmacro)) | |
1944 | { | |
1945 | Lisp_Object kind = Fnth (make_number (4), fundef); | |
1946 | if (! (EQ (kind, Qt) || EQ (kind, Qmacro))) | |
1947 | return fundef; | |
1948 | } | |
1949 | ||
aea6173f RS |
1950 | /* This is to make sure that loadup.el gives a clear picture |
1951 | of what files are preloaded and when. */ | |
ab4db096 RS |
1952 | if (! NILP (Vpurify_flag)) |
1953 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 1954 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 1955 | |
b7826503 | 1956 | CHECK_SYMBOL (funname); |
7abaf5cc | 1957 | GCPRO3 (funname, fundef, macro_only); |
db9f0278 | 1958 | |
f87740dc | 1959 | /* Preserve the match data. */ |
89f2614d | 1960 | record_unwind_save_match_data (); |
177c0ea7 | 1961 | |
a04ee161 RS |
1962 | /* If autoloading gets an error (which includes the error of failing |
1963 | to define the function being called), we use Vautoload_queue | |
1964 | to undo function definitions and `provide' calls made by | |
1965 | the function. We do this in the specific case of autoloading | |
1966 | because autoloading is not an explicit request "load this file", | |
1967 | but rather a request to "call this function". | |
d3da34e0 | 1968 | |
a04ee161 | 1969 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
1970 | record_unwind_protect (un_autoload, Vautoload_queue); |
1971 | Vautoload_queue = Qt; | |
7abaf5cc SM |
1972 | /* If `macro_only', assume this autoload to be a "best-effort", |
1973 | so don't signal an error if autoloading fails. */ | |
1974 | Fload (Fcar (Fcdr (fundef)), macro_only, Qt, Qnil, Qt); | |
2a49b6e5 | 1975 | |
db9f0278 JB |
1976 | /* Once loading finishes, don't undo it. */ |
1977 | Vautoload_queue = Qt; | |
1978 | unbind_to (count, Qnil); | |
1979 | ||
ca20916b | 1980 | UNGCPRO; |
7abaf5cc SM |
1981 | |
1982 | if (NILP (funname)) | |
1983 | return Qnil; | |
1984 | else | |
1985 | { | |
1986 | Lisp_Object fun = Findirect_function (funname, Qnil); | |
1987 | ||
1988 | if (!NILP (Fequal (fun, fundef))) | |
1989 | error ("Autoloading failed to define function %s", | |
1990 | SDATA (SYMBOL_NAME (funname))); | |
1991 | else | |
1992 | return fun; | |
1993 | } | |
db9f0278 | 1994 | } |
4c576a83 | 1995 | |
db9f0278 | 1996 | \f |
a7ca3326 | 1997 | DEFUN ("eval", Feval, Seval, 1, 2, 0, |
a0ee6f27 SM |
1998 | doc: /* Evaluate FORM and return its value. |
1999 | If LEXICAL is t, evaluate using lexical scoping. */) | |
2000 | (Lisp_Object form, Lisp_Object lexical) | |
defb1411 | 2001 | { |
d311d28c | 2002 | ptrdiff_t count = SPECPDL_INDEX (); |
a0ee6f27 | 2003 | specbind (Qinternal_interpreter_environment, |
6c6f1994 | 2004 | CONSP (lexical) || NILP (lexical) ? lexical : list1 (Qt)); |
defb1411 SM |
2005 | return unbind_to (count, eval_sub (form)); |
2006 | } | |
2007 | ||
5e301d76 PE |
2008 | /* Grow the specpdl stack by one entry. |
2009 | The caller should have already initialized the entry. | |
2010 | Signal an error on stack overflow. | |
2011 | ||
2012 | Make sure that there is always one unused entry past the top of the | |
2013 | stack, so that the just-initialized entry is safely unwound if | |
2014 | memory exhausted and an error is signaled here. Also, allocate a | |
2015 | never-used entry just before the bottom of the stack; sometimes its | |
2016 | address is taken. */ | |
2017 | ||
2f592f95 SM |
2018 | static void |
2019 | grow_specpdl (void) | |
2020 | { | |
5e301d76 PE |
2021 | specpdl_ptr++; |
2022 | ||
2023 | if (specpdl_ptr == specpdl + specpdl_size) | |
2f592f95 | 2024 | { |
5e301d76 PE |
2025 | ptrdiff_t count = SPECPDL_INDEX (); |
2026 | ptrdiff_t max_size = min (max_specpdl_size, PTRDIFF_MAX - 1000); | |
2027 | union specbinding *pdlvec = specpdl - 1; | |
2028 | ptrdiff_t pdlvecsize = specpdl_size + 1; | |
2f592f95 | 2029 | if (max_size <= specpdl_size) |
5e301d76 PE |
2030 | { |
2031 | if (max_specpdl_size < 400) | |
2032 | max_size = max_specpdl_size = 400; | |
2033 | if (max_size <= specpdl_size) | |
2034 | signal_error ("Variable binding depth exceeds max-specpdl-size", | |
2035 | Qnil); | |
2036 | } | |
2037 | pdlvec = xpalloc (pdlvec, &pdlvecsize, 1, max_size + 1, sizeof *specpdl); | |
2038 | specpdl = pdlvec + 1; | |
2039 | specpdl_size = pdlvecsize - 1; | |
2040 | specpdl_ptr = specpdl + count; | |
2f592f95 | 2041 | } |
2f592f95 SM |
2042 | } |
2043 | ||
3d5ee10a | 2044 | void |
2f592f95 SM |
2045 | record_in_backtrace (Lisp_Object function, Lisp_Object *args, ptrdiff_t nargs) |
2046 | { | |
2047 | eassert (nargs >= UNEVALLED); | |
9349e5f7 PE |
2048 | specpdl_ptr->bt.kind = SPECPDL_BACKTRACE; |
2049 | specpdl_ptr->bt.debug_on_exit = false; | |
2050 | specpdl_ptr->bt.function = function; | |
2051 | specpdl_ptr->bt.args = args; | |
2052 | specpdl_ptr->bt.nargs = nargs; | |
5e301d76 | 2053 | grow_specpdl (); |
2f592f95 SM |
2054 | } |
2055 | ||
defb1411 SM |
2056 | /* Eval a sub-expression of the current expression (i.e. in the same |
2057 | lexical scope). */ | |
2058 | Lisp_Object | |
2059 | eval_sub (Lisp_Object form) | |
db9f0278 JB |
2060 | { |
2061 | Lisp_Object fun, val, original_fun, original_args; | |
2062 | Lisp_Object funcar; | |
db9f0278 JB |
2063 | struct gcpro gcpro1, gcpro2, gcpro3; |
2064 | ||
90165123 | 2065 | if (SYMBOLP (form)) |
b9598260 | 2066 | { |
f07a954e SM |
2067 | /* Look up its binding in the lexical environment. |
2068 | We do not pay attention to the declared_special flag here, since we | |
2069 | already did that when let-binding the variable. */ | |
2070 | Lisp_Object lex_binding | |
2071 | = !NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
2072 | ? Fassq (form, Vinternal_interpreter_environment) | |
2073 | : Qnil; | |
2074 | if (CONSP (lex_binding)) | |
2075 | return XCDR (lex_binding); | |
2076 | else | |
2077 | return Fsymbol_value (form); | |
b9598260 SM |
2078 | } |
2079 | ||
db9f0278 JB |
2080 | if (!CONSP (form)) |
2081 | return form; | |
2082 | ||
2083 | QUIT; | |
9d5a1260 DA |
2084 | |
2085 | GCPRO1 (form); | |
765e61e3 | 2086 | maybe_gc (); |
9d5a1260 | 2087 | UNGCPRO; |
db9f0278 JB |
2088 | |
2089 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2090 | { | |
2091 | if (max_lisp_eval_depth < 100) | |
2092 | max_lisp_eval_depth = 100; | |
2093 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2094 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2095 | } |
2096 | ||
7d7bbefd DA |
2097 | original_fun = XCAR (form); |
2098 | original_args = XCDR (form); | |
db9f0278 | 2099 | |
2f592f95 SM |
2100 | /* This also protects them from gc. */ |
2101 | record_in_backtrace (original_fun, &original_args, UNEVALLED); | |
db9f0278 JB |
2102 | |
2103 | if (debug_on_next_call) | |
2104 | do_debug_on_call (Qt); | |
2105 | ||
2106 | /* At this point, only original_fun and original_args | |
f6d62986 | 2107 | have values that will be used below. */ |
db9f0278 | 2108 | retry: |
8788120f KS |
2109 | |
2110 | /* Optimize for no indirection. */ | |
2111 | fun = original_fun; | |
eadf1faa | 2112 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2113 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2114 | fun = indirect_function (fun); |
db9f0278 | 2115 | |
90165123 | 2116 | if (SUBRP (fun)) |
db9f0278 JB |
2117 | { |
2118 | Lisp_Object numargs; | |
166c822d | 2119 | Lisp_Object argvals[8]; |
db9f0278 JB |
2120 | Lisp_Object args_left; |
2121 | register int i, maxargs; | |
2122 | ||
2123 | args_left = original_args; | |
2124 | numargs = Flength (args_left); | |
2125 | ||
7e63e0c3 | 2126 | check_cons_list (); |
c1788fbc | 2127 | |
f6d62986 SM |
2128 | if (XINT (numargs) < XSUBR (fun)->min_args |
2129 | || (XSUBR (fun)->max_args >= 0 | |
2130 | && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2131 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2132 | |
ef1b0ba7 | 2133 | else if (XSUBR (fun)->max_args == UNEVALLED) |
bbc6b304 | 2134 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
ef1b0ba7 | 2135 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 | 2136 | { |
f6d62986 | 2137 | /* Pass a vector of evaluated arguments. */ |
db9f0278 | 2138 | Lisp_Object *vals; |
f66c7cf8 | 2139 | ptrdiff_t argnum = 0; |
3a7a9129 | 2140 | USE_SAFE_ALLOCA; |
db9f0278 | 2141 | |
b72e0717 | 2142 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2143 | |
2144 | GCPRO3 (args_left, fun, fun); | |
2145 | gcpro3.var = vals; | |
2146 | gcpro3.nvars = 0; | |
2147 | ||
265a9e55 | 2148 | while (!NILP (args_left)) |
db9f0278 | 2149 | { |
defb1411 | 2150 | vals[argnum++] = eval_sub (Fcar (args_left)); |
db9f0278 JB |
2151 | args_left = Fcdr (args_left); |
2152 | gcpro3.nvars = argnum; | |
2153 | } | |
db9f0278 | 2154 | |
2f592f95 SM |
2155 | set_backtrace_args (specpdl_ptr - 1, vals); |
2156 | set_backtrace_nargs (specpdl_ptr - 1, XINT (numargs)); | |
db9f0278 | 2157 | |
d5273788 | 2158 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2159 | UNGCPRO; |
3a7a9129 | 2160 | SAFE_FREE (); |
db9f0278 | 2161 | } |
ef1b0ba7 | 2162 | else |
db9f0278 | 2163 | { |
ef1b0ba7 SM |
2164 | GCPRO3 (args_left, fun, fun); |
2165 | gcpro3.var = argvals; | |
2166 | gcpro3.nvars = 0; | |
db9f0278 | 2167 | |
ef1b0ba7 SM |
2168 | maxargs = XSUBR (fun)->max_args; |
2169 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2170 | { | |
a0ee6f27 | 2171 | argvals[i] = eval_sub (Fcar (args_left)); |
ef1b0ba7 SM |
2172 | gcpro3.nvars = ++i; |
2173 | } | |
db9f0278 | 2174 | |
ef1b0ba7 | 2175 | UNGCPRO; |
db9f0278 | 2176 | |
2f592f95 SM |
2177 | set_backtrace_args (specpdl_ptr - 1, argvals); |
2178 | set_backtrace_nargs (specpdl_ptr - 1, XINT (numargs)); | |
ef1b0ba7 SM |
2179 | |
2180 | switch (i) | |
2181 | { | |
2182 | case 0: | |
2183 | val = (XSUBR (fun)->function.a0 ()); | |
2184 | break; | |
2185 | case 1: | |
2186 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2187 | break; | |
2188 | case 2: | |
2189 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2190 | break; | |
2191 | case 3: | |
2192 | val = (XSUBR (fun)->function.a3 | |
2193 | (argvals[0], argvals[1], argvals[2])); | |
2194 | break; | |
2195 | case 4: | |
2196 | val = (XSUBR (fun)->function.a4 | |
2197 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2198 | break; | |
2199 | case 5: | |
2200 | val = (XSUBR (fun)->function.a5 | |
2201 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2202 | argvals[4])); | |
2203 | break; | |
2204 | case 6: | |
2205 | val = (XSUBR (fun)->function.a6 | |
2206 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2207 | argvals[4], argvals[5])); | |
2208 | break; | |
2209 | case 7: | |
2210 | val = (XSUBR (fun)->function.a7 | |
2211 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2212 | argvals[4], argvals[5], argvals[6])); | |
2213 | break; | |
2214 | ||
2215 | case 8: | |
2216 | val = (XSUBR (fun)->function.a8 | |
2217 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2218 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2219 | break; | |
2220 | ||
2221 | default: | |
2222 | /* Someone has created a subr that takes more arguments than | |
2223 | is supported by this code. We need to either rewrite the | |
2224 | subr to use a different argument protocol, or add more | |
2225 | cases to this switch. */ | |
1088b922 | 2226 | emacs_abort (); |
ef1b0ba7 | 2227 | } |
db9f0278 JB |
2228 | } |
2229 | } | |
ef1b0ba7 | 2230 | else if (COMPILEDP (fun)) |
defb1411 | 2231 | val = apply_lambda (fun, original_args); |
db9f0278 JB |
2232 | else |
2233 | { | |
eadf1faa | 2234 | if (NILP (fun)) |
734d55a2 | 2235 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2236 | if (!CONSP (fun)) |
734d55a2 KS |
2237 | xsignal1 (Qinvalid_function, original_fun); |
2238 | funcar = XCAR (fun); | |
90165123 | 2239 | if (!SYMBOLP (funcar)) |
734d55a2 | 2240 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2241 | if (EQ (funcar, Qautoload)) |
2242 | { | |
7abaf5cc | 2243 | Fautoload_do_load (fun, original_fun, Qnil); |
db9f0278 JB |
2244 | goto retry; |
2245 | } | |
2246 | if (EQ (funcar, Qmacro)) | |
8be3a09c SM |
2247 | { |
2248 | ptrdiff_t count = SPECPDL_INDEX (); | |
8be3a09c SM |
2249 | Lisp_Object exp; |
2250 | /* Bind lexical-binding during expansion of the macro, so the | |
2251 | macro can know reliably if the code it outputs will be | |
2252 | interpreted using lexical-binding or not. */ | |
2253 | specbind (Qlexical_binding, | |
2254 | NILP (Vinternal_interpreter_environment) ? Qnil : Qt); | |
2255 | exp = apply1 (Fcdr (fun), original_args); | |
2256 | unbind_to (count, Qnil); | |
2257 | val = eval_sub (exp); | |
2258 | } | |
defb1411 SM |
2259 | else if (EQ (funcar, Qlambda) |
2260 | || EQ (funcar, Qclosure)) | |
2261 | val = apply_lambda (fun, original_args); | |
db9f0278 | 2262 | else |
734d55a2 | 2263 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2264 | } |
7e63e0c3 | 2265 | check_cons_list (); |
c1788fbc | 2266 | |
db9f0278 | 2267 | lisp_eval_depth--; |
2f592f95 | 2268 | if (backtrace_debug_on_exit (specpdl_ptr - 1)) |
6c6f1994 | 2269 | val = call_debugger (list2 (Qexit, val)); |
2f592f95 | 2270 | specpdl_ptr--; |
824eb35e | 2271 | |
db9f0278 JB |
2272 | return val; |
2273 | } | |
2274 | \f | |
8edd4a2b | 2275 | DEFUN ("apply", Fapply, Sapply, 1, MANY, 0, |
9dbc9081 PJ |
2276 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2277 | Then return the value FUNCTION returns. | |
2278 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2279 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2280 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2281 | { |
d311d28c PE |
2282 | ptrdiff_t i; |
2283 | EMACS_INT numargs; | |
db9f0278 JB |
2284 | register Lisp_Object spread_arg; |
2285 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2286 | Lisp_Object fun, retval; |
96d44c64 | 2287 | struct gcpro gcpro1; |
3a7a9129 | 2288 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2289 | |
2290 | fun = args [0]; | |
2291 | funcall_args = 0; | |
2292 | spread_arg = args [nargs - 1]; | |
b7826503 | 2293 | CHECK_LIST (spread_arg); |
177c0ea7 | 2294 | |
db9f0278 JB |
2295 | numargs = XINT (Flength (spread_arg)); |
2296 | ||
2297 | if (numargs == 0) | |
2298 | return Ffuncall (nargs - 1, args); | |
2299 | else if (numargs == 1) | |
2300 | { | |
03699b14 | 2301 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2302 | return Ffuncall (nargs, args); |
2303 | } | |
2304 | ||
a6e3fa71 | 2305 | numargs += nargs - 2; |
db9f0278 | 2306 | |
8788120f | 2307 | /* Optimize for no indirection. */ |
eadf1faa | 2308 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2309 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2310 | fun = indirect_function (fun); |
eadf1faa | 2311 | if (NILP (fun)) |
db9f0278 | 2312 | { |
f6d62986 | 2313 | /* Let funcall get the error. */ |
ffd56f97 JB |
2314 | fun = args[0]; |
2315 | goto funcall; | |
db9f0278 JB |
2316 | } |
2317 | ||
90165123 | 2318 | if (SUBRP (fun)) |
db9f0278 JB |
2319 | { |
2320 | if (numargs < XSUBR (fun)->min_args | |
2321 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
f6d62986 | 2322 | goto funcall; /* Let funcall get the error. */ |
c5101a77 | 2323 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2324 | { |
2325 | /* Avoid making funcall cons up a yet another new vector of arguments | |
f6d62986 | 2326 | by explicitly supplying nil's for optional values. */ |
b72e0717 | 2327 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2328 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2329 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2330 | GCPRO1 (*funcall_args); |
2331 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2332 | } |
2333 | } | |
2334 | funcall: | |
2335 | /* We add 1 to numargs because funcall_args includes the | |
2336 | function itself as well as its arguments. */ | |
2337 | if (!funcall_args) | |
a6e3fa71 | 2338 | { |
b72e0717 | 2339 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2340 | GCPRO1 (*funcall_args); |
2341 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2342 | } |
2343 | ||
663e2b3f | 2344 | memcpy (funcall_args, args, nargs * word_size); |
db9f0278 JB |
2345 | /* Spread the last arg we got. Its first element goes in |
2346 | the slot that it used to occupy, hence this value of I. */ | |
2347 | i = nargs - 1; | |
265a9e55 | 2348 | while (!NILP (spread_arg)) |
db9f0278 | 2349 | { |
03699b14 KR |
2350 | funcall_args [i++] = XCAR (spread_arg); |
2351 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2352 | } |
a6e3fa71 | 2353 | |
96d44c64 | 2354 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2355 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2356 | UNGCPRO; | |
2357 | SAFE_FREE (); | |
2358 | ||
2359 | return retval; | |
db9f0278 JB |
2360 | } |
2361 | \f | |
ff936e53 SM |
2362 | /* Run hook variables in various ways. */ |
2363 | ||
f6d62986 | 2364 | static Lisp_Object |
f66c7cf8 | 2365 | funcall_nil (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2366 | { |
2367 | Ffuncall (nargs, args); | |
2368 | return Qnil; | |
2369 | } | |
ff936e53 | 2370 | |
a7ca3326 | 2371 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2372 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2373 | Each argument should be a symbol, a hook variable. |
2374 | These symbols are processed in the order specified. | |
2375 | If a hook symbol has a non-nil value, that value may be a function | |
2376 | or a list of functions to be called to run the hook. | |
2377 | If the value is a function, it is called with no arguments. | |
2378 | If it is a list, the elements are called, in order, with no arguments. | |
2379 | ||
9f685258 LK |
2380 | Major modes should not use this function directly to run their mode |
2381 | hook; they should use `run-mode-hooks' instead. | |
2382 | ||
72e85d5d RS |
2383 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2384 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2385 | usage: (run-hooks &rest HOOKS) */) |
f66c7cf8 | 2386 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 SM |
2387 | { |
2388 | Lisp_Object hook[1]; | |
f66c7cf8 | 2389 | ptrdiff_t i; |
ff936e53 SM |
2390 | |
2391 | for (i = 0; i < nargs; i++) | |
2392 | { | |
2393 | hook[0] = args[i]; | |
f6d62986 | 2394 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
2395 | } |
2396 | ||
2397 | return Qnil; | |
2398 | } | |
177c0ea7 | 2399 | |
a7ca3326 | 2400 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2401 | Srun_hook_with_args, 1, MANY, 0, |
2402 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2403 | HOOK should be a symbol, a hook variable. The value of HOOK |
2404 | may be nil, a function, or a list of functions. Call each | |
2405 | function in order with arguments ARGS. The final return value | |
2406 | is unspecified. | |
9dbc9081 | 2407 | |
72e85d5d RS |
2408 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2409 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2410 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
f66c7cf8 | 2411 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2412 | { |
f6d62986 | 2413 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
2414 | } |
2415 | ||
d393cefb GM |
2416 | /* NB this one still documents a specific non-nil return value. |
2417 | (As did run-hook-with-args and run-hook-with-args-until-failure | |
2418 | until they were changed in 24.1.) */ | |
a0d76c27 | 2419 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2420 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2421 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2422 | HOOK should be a symbol, a hook variable. The value of HOOK |
2423 | may be nil, a function, or a list of functions. Call each | |
2424 | function in order with arguments ARGS, stopping at the first | |
2425 | one that returns non-nil, and return that value. Otherwise (if | |
2426 | all functions return nil, or if there are no functions to call), | |
2427 | return nil. | |
9dbc9081 | 2428 | |
72e85d5d RS |
2429 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2430 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2431 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
f66c7cf8 | 2432 | (ptrdiff_t nargs, Lisp_Object *args) |
b0b667cb | 2433 | { |
f6d62986 SM |
2434 | return run_hook_with_args (nargs, args, Ffuncall); |
2435 | } | |
2436 | ||
2437 | static Lisp_Object | |
f66c7cf8 | 2438 | funcall_not (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2439 | { |
2440 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
2441 | } |
2442 | ||
a7ca3326 | 2443 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2444 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2445 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2446 | HOOK should be a symbol, a hook variable. The value of HOOK |
2447 | may be nil, a function, or a list of functions. Call each | |
2448 | function in order with arguments ARGS, stopping at the first | |
2449 | one that returns nil, and return nil. Otherwise (if all functions | |
2450 | return non-nil, or if there are no functions to call), return non-nil | |
2451 | \(do not rely on the precise return value in this case). | |
9dbc9081 | 2452 | |
72e85d5d RS |
2453 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2454 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2455 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
f66c7cf8 | 2456 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2457 | { |
f6d62986 | 2458 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
2459 | } |
2460 | ||
f6d62986 | 2461 | static Lisp_Object |
f66c7cf8 | 2462 | run_hook_wrapped_funcall (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2463 | { |
2464 | Lisp_Object tmp = args[0], ret; | |
2465 | args[0] = args[1]; | |
2466 | args[1] = tmp; | |
2467 | ret = Ffuncall (nargs, args); | |
2468 | args[1] = args[0]; | |
2469 | args[0] = tmp; | |
2470 | return ret; | |
2471 | } | |
2472 | ||
2473 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
2474 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
2475 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
2476 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
2477 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
2478 | aborts and returns that value. | |
2479 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
f66c7cf8 | 2480 | (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2481 | { |
2482 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
2483 | } | |
ff936e53 | 2484 | |
c933ea05 RS |
2485 | /* ARGS[0] should be a hook symbol. |
2486 | Call each of the functions in the hook value, passing each of them | |
2487 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 2488 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
2489 | The caller (or its caller, etc) must gcpro all of ARGS, |
2490 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2491 | ||
f6d62986 | 2492 | Lisp_Object |
f66c7cf8 PE |
2493 | run_hook_with_args (ptrdiff_t nargs, Lisp_Object *args, |
2494 | Lisp_Object (*funcall) (ptrdiff_t nargs, Lisp_Object *args)) | |
ff936e53 | 2495 | { |
f6d62986 | 2496 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 2497 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2498 | |
f029ca5f RS |
2499 | /* If we are dying or still initializing, |
2500 | don't do anything--it would probably crash if we tried. */ | |
2501 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2502 | return Qnil; |
f029ca5f | 2503 | |
b0b667cb | 2504 | sym = args[0]; |
aa681b51 | 2505 | val = find_symbol_value (sym); |
ff936e53 | 2506 | |
b0b667cb | 2507 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2508 | return ret; |
03699b14 | 2509 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2510 | { |
2511 | args[0] = val; | |
f6d62986 | 2512 | return funcall (nargs, args); |
b0b667cb KH |
2513 | } |
2514 | else | |
2515 | { | |
1faed8ae PE |
2516 | Lisp_Object global_vals = Qnil; |
2517 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2518 | |
ff936e53 | 2519 | for (; |
f6d62986 | 2520 | CONSP (val) && NILP (ret); |
03699b14 | 2521 | val = XCDR (val)) |
b0b667cb | 2522 | { |
03699b14 | 2523 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2524 | { |
2525 | /* t indicates this hook has a local binding; | |
2526 | it means to run the global binding too. */ | |
1faed8ae PE |
2527 | global_vals = Fdefault_value (sym); |
2528 | if (NILP (global_vals)) continue; | |
b0b667cb | 2529 | |
1faed8ae | 2530 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2531 | { |
1faed8ae | 2532 | args[0] = global_vals; |
f6d62986 | 2533 | ret = funcall (nargs, args); |
8932b1c2 CY |
2534 | } |
2535 | else | |
2536 | { | |
2537 | for (; | |
f6d62986 | 2538 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 2539 | global_vals = XCDR (global_vals)) |
8932b1c2 | 2540 | { |
1faed8ae | 2541 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2542 | /* In a global value, t should not occur. If it does, we |
2543 | must ignore it to avoid an endless loop. */ | |
2544 | if (!EQ (args[0], Qt)) | |
f6d62986 | 2545 | ret = funcall (nargs, args); |
8932b1c2 | 2546 | } |
b0b667cb KH |
2547 | } |
2548 | } | |
2549 | else | |
2550 | { | |
03699b14 | 2551 | args[0] = XCAR (val); |
f6d62986 | 2552 | ret = funcall (nargs, args); |
b0b667cb KH |
2553 | } |
2554 | } | |
cb9d21f8 RS |
2555 | |
2556 | UNGCPRO; | |
ff936e53 | 2557 | return ret; |
b0b667cb KH |
2558 | } |
2559 | } | |
c933ea05 | 2560 | |
7d48558f RS |
2561 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2562 | ||
2563 | void | |
d3da34e0 | 2564 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2565 | { |
2566 | Lisp_Object temp[3]; | |
2567 | temp[0] = hook; | |
2568 | temp[1] = arg1; | |
2569 | temp[2] = arg2; | |
2570 | ||
2571 | Frun_hook_with_args (3, temp); | |
2572 | } | |
ff936e53 | 2573 | \f |
f6d62986 | 2574 | /* Apply fn to arg. */ |
db9f0278 | 2575 | Lisp_Object |
d3da34e0 | 2576 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2577 | { |
a6e3fa71 JB |
2578 | struct gcpro gcpro1; |
2579 | ||
2580 | GCPRO1 (fn); | |
265a9e55 | 2581 | if (NILP (arg)) |
a6e3fa71 JB |
2582 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2583 | gcpro1.nvars = 2; | |
db9f0278 JB |
2584 | { |
2585 | Lisp_Object args[2]; | |
2586 | args[0] = fn; | |
2587 | args[1] = arg; | |
a6e3fa71 JB |
2588 | gcpro1.var = args; |
2589 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2590 | } |
db9f0278 JB |
2591 | } |
2592 | ||
f6d62986 | 2593 | /* Call function fn on no arguments. */ |
db9f0278 | 2594 | Lisp_Object |
d3da34e0 | 2595 | call0 (Lisp_Object fn) |
db9f0278 | 2596 | { |
a6e3fa71 JB |
2597 | struct gcpro gcpro1; |
2598 | ||
2599 | GCPRO1 (fn); | |
2600 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2601 | } |
2602 | ||
f6d62986 | 2603 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
2604 | /* ARGSUSED */ |
2605 | Lisp_Object | |
d3da34e0 | 2606 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2607 | { |
a6e3fa71 | 2608 | struct gcpro gcpro1; |
177c0ea7 | 2609 | Lisp_Object args[2]; |
a6e3fa71 | 2610 | |
db9f0278 | 2611 | args[0] = fn; |
15285f9f | 2612 | args[1] = arg1; |
a6e3fa71 JB |
2613 | GCPRO1 (args[0]); |
2614 | gcpro1.nvars = 2; | |
2615 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2616 | } |
2617 | ||
f6d62986 | 2618 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
2619 | /* ARGSUSED */ |
2620 | Lisp_Object | |
d3da34e0 | 2621 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2622 | { |
a6e3fa71 | 2623 | struct gcpro gcpro1; |
db9f0278 JB |
2624 | Lisp_Object args[3]; |
2625 | args[0] = fn; | |
15285f9f RS |
2626 | args[1] = arg1; |
2627 | args[2] = arg2; | |
a6e3fa71 JB |
2628 | GCPRO1 (args[0]); |
2629 | gcpro1.nvars = 3; | |
2630 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2631 | } |
2632 | ||
f6d62986 | 2633 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
2634 | /* ARGSUSED */ |
2635 | Lisp_Object | |
d3da34e0 | 2636 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2637 | { |
a6e3fa71 | 2638 | struct gcpro gcpro1; |
db9f0278 JB |
2639 | Lisp_Object args[4]; |
2640 | args[0] = fn; | |
15285f9f RS |
2641 | args[1] = arg1; |
2642 | args[2] = arg2; | |
2643 | args[3] = arg3; | |
a6e3fa71 JB |
2644 | GCPRO1 (args[0]); |
2645 | gcpro1.nvars = 4; | |
2646 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2647 | } |
2648 | ||
f6d62986 | 2649 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
2650 | /* ARGSUSED */ |
2651 | Lisp_Object | |
d3da34e0 JB |
2652 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2653 | Lisp_Object arg4) | |
a5a44b91 JB |
2654 | { |
2655 | struct gcpro gcpro1; | |
a5a44b91 JB |
2656 | Lisp_Object args[5]; |
2657 | args[0] = fn; | |
15285f9f RS |
2658 | args[1] = arg1; |
2659 | args[2] = arg2; | |
2660 | args[3] = arg3; | |
2661 | args[4] = arg4; | |
a5a44b91 JB |
2662 | GCPRO1 (args[0]); |
2663 | gcpro1.nvars = 5; | |
2664 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2665 | } |
2666 | ||
f6d62986 | 2667 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
2668 | /* ARGSUSED */ |
2669 | Lisp_Object | |
d3da34e0 JB |
2670 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2671 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2672 | { |
2673 | struct gcpro gcpro1; | |
15285f9f RS |
2674 | Lisp_Object args[6]; |
2675 | args[0] = fn; | |
2676 | args[1] = arg1; | |
2677 | args[2] = arg2; | |
2678 | args[3] = arg3; | |
2679 | args[4] = arg4; | |
2680 | args[5] = arg5; | |
2681 | GCPRO1 (args[0]); | |
2682 | gcpro1.nvars = 6; | |
2683 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2684 | } |
2685 | ||
f6d62986 | 2686 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
2687 | /* ARGSUSED */ |
2688 | Lisp_Object | |
d3da34e0 JB |
2689 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2690 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2691 | { |
2692 | struct gcpro gcpro1; | |
15285f9f RS |
2693 | Lisp_Object args[7]; |
2694 | args[0] = fn; | |
2695 | args[1] = arg1; | |
2696 | args[2] = arg2; | |
2697 | args[3] = arg3; | |
2698 | args[4] = arg4; | |
2699 | args[5] = arg5; | |
2700 | args[6] = arg6; | |
2701 | GCPRO1 (args[0]); | |
2702 | gcpro1.nvars = 7; | |
2703 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2704 | } |
2705 | ||
f6d62986 | 2706 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
2707 | /* ARGSUSED */ |
2708 | Lisp_Object | |
d3da34e0 JB |
2709 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2710 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2711 | { |
2712 | struct gcpro gcpro1; | |
574c05e2 KK |
2713 | Lisp_Object args[8]; |
2714 | args[0] = fn; | |
2715 | args[1] = arg1; | |
2716 | args[2] = arg2; | |
2717 | args[3] = arg3; | |
2718 | args[4] = arg4; | |
2719 | args[5] = arg5; | |
2720 | args[6] = arg6; | |
2721 | args[7] = arg7; | |
2722 | GCPRO1 (args[0]); | |
2723 | gcpro1.nvars = 8; | |
2724 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2725 | } |
2726 | ||
6c2ef893 RS |
2727 | /* The caller should GCPRO all the elements of ARGS. */ |
2728 | ||
a7ca3326 | 2729 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 2730 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 2731 | (Lisp_Object object) |
b9598260 | 2732 | { |
e1f29348 | 2733 | if (FUNCTIONP (object)) |
b9598260 | 2734 | return Qt; |
e1f29348 | 2735 | return Qnil; |
b9598260 SM |
2736 | } |
2737 | ||
a7ca3326 | 2738 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2739 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2740 | Return the value that function returns. | |
2741 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2742 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2743 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2744 | { |
8788120f | 2745 | Lisp_Object fun, original_fun; |
db9f0278 | 2746 | Lisp_Object funcar; |
f66c7cf8 | 2747 | ptrdiff_t numargs = nargs - 1; |
db9f0278 JB |
2748 | Lisp_Object lisp_numargs; |
2749 | Lisp_Object val; | |
db9f0278 | 2750 | register Lisp_Object *internal_args; |
f66c7cf8 | 2751 | ptrdiff_t i; |
db9f0278 JB |
2752 | |
2753 | QUIT; | |
db9f0278 JB |
2754 | |
2755 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2756 | { | |
2757 | if (max_lisp_eval_depth < 100) | |
2758 | max_lisp_eval_depth = 100; | |
2759 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2760 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2761 | } |
2762 | ||
2f592f95 SM |
2763 | /* This also GCPROs them. */ |
2764 | record_in_backtrace (args[0], &args[1], nargs - 1); | |
db9f0278 | 2765 | |
7abaf5cc SM |
2766 | /* Call GC after setting up the backtrace, so the latter GCPROs the args. */ |
2767 | maybe_gc (); | |
2768 | ||
db9f0278 JB |
2769 | if (debug_on_next_call) |
2770 | do_debug_on_call (Qlambda); | |
2771 | ||
7e63e0c3 | 2772 | check_cons_list (); |
fff3ff9c | 2773 | |
8788120f KS |
2774 | original_fun = args[0]; |
2775 | ||
db9f0278 JB |
2776 | retry: |
2777 | ||
8788120f KS |
2778 | /* Optimize for no indirection. */ |
2779 | fun = original_fun; | |
eadf1faa | 2780 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2781 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2782 | fun = indirect_function (fun); |
db9f0278 | 2783 | |
90165123 | 2784 | if (SUBRP (fun)) |
db9f0278 | 2785 | { |
ef1b0ba7 | 2786 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
2787 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
2788 | { | |
a631e24c | 2789 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 2790 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
2791 | } |
2792 | ||
ef1b0ba7 | 2793 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 2794 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2795 | |
ef1b0ba7 SM |
2796 | else if (XSUBR (fun)->max_args == MANY) |
2797 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 2798 | else |
db9f0278 | 2799 | { |
ef1b0ba7 SM |
2800 | if (XSUBR (fun)->max_args > numargs) |
2801 | { | |
38182d90 PE |
2802 | internal_args = alloca (XSUBR (fun)->max_args |
2803 | * sizeof *internal_args); | |
663e2b3f | 2804 | memcpy (internal_args, args + 1, numargs * word_size); |
ef1b0ba7 SM |
2805 | for (i = numargs; i < XSUBR (fun)->max_args; i++) |
2806 | internal_args[i] = Qnil; | |
2807 | } | |
2808 | else | |
2809 | internal_args = args + 1; | |
2810 | switch (XSUBR (fun)->max_args) | |
2811 | { | |
2812 | case 0: | |
2813 | val = (XSUBR (fun)->function.a0 ()); | |
2814 | break; | |
2815 | case 1: | |
2816 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
2817 | break; | |
2818 | case 2: | |
2819 | val = (XSUBR (fun)->function.a2 | |
2820 | (internal_args[0], internal_args[1])); | |
2821 | break; | |
2822 | case 3: | |
2823 | val = (XSUBR (fun)->function.a3 | |
2824 | (internal_args[0], internal_args[1], internal_args[2])); | |
2825 | break; | |
2826 | case 4: | |
2827 | val = (XSUBR (fun)->function.a4 | |
2828 | (internal_args[0], internal_args[1], internal_args[2], | |
2829 | internal_args[3])); | |
2830 | break; | |
2831 | case 5: | |
2832 | val = (XSUBR (fun)->function.a5 | |
2833 | (internal_args[0], internal_args[1], internal_args[2], | |
2834 | internal_args[3], internal_args[4])); | |
2835 | break; | |
2836 | case 6: | |
2837 | val = (XSUBR (fun)->function.a6 | |
2838 | (internal_args[0], internal_args[1], internal_args[2], | |
2839 | internal_args[3], internal_args[4], internal_args[5])); | |
2840 | break; | |
2841 | case 7: | |
2842 | val = (XSUBR (fun)->function.a7 | |
2843 | (internal_args[0], internal_args[1], internal_args[2], | |
2844 | internal_args[3], internal_args[4], internal_args[5], | |
2845 | internal_args[6])); | |
2846 | break; | |
2847 | ||
2848 | case 8: | |
2849 | val = (XSUBR (fun)->function.a8 | |
2850 | (internal_args[0], internal_args[1], internal_args[2], | |
2851 | internal_args[3], internal_args[4], internal_args[5], | |
2852 | internal_args[6], internal_args[7])); | |
2853 | break; | |
2854 | ||
2855 | default: | |
2856 | ||
2857 | /* If a subr takes more than 8 arguments without using MANY | |
2858 | or UNEVALLED, we need to extend this function to support it. | |
2859 | Until this is done, there is no way to call the function. */ | |
1088b922 | 2860 | emacs_abort (); |
ef1b0ba7 | 2861 | } |
db9f0278 JB |
2862 | } |
2863 | } | |
ef1b0ba7 | 2864 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2865 | val = funcall_lambda (fun, numargs, args + 1); |
2866 | else | |
2867 | { | |
eadf1faa | 2868 | if (NILP (fun)) |
734d55a2 | 2869 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2870 | if (!CONSP (fun)) |
734d55a2 KS |
2871 | xsignal1 (Qinvalid_function, original_fun); |
2872 | funcar = XCAR (fun); | |
90165123 | 2873 | if (!SYMBOLP (funcar)) |
734d55a2 | 2874 | xsignal1 (Qinvalid_function, original_fun); |
defb1411 SM |
2875 | if (EQ (funcar, Qlambda) |
2876 | || EQ (funcar, Qclosure)) | |
db9f0278 | 2877 | val = funcall_lambda (fun, numargs, args + 1); |
db9f0278 JB |
2878 | else if (EQ (funcar, Qautoload)) |
2879 | { | |
7abaf5cc | 2880 | Fautoload_do_load (fun, original_fun, Qnil); |
7e63e0c3 | 2881 | check_cons_list (); |
db9f0278 JB |
2882 | goto retry; |
2883 | } | |
2884 | else | |
734d55a2 | 2885 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2886 | } |
7e63e0c3 | 2887 | check_cons_list (); |
db9f0278 | 2888 | lisp_eval_depth--; |
2f592f95 | 2889 | if (backtrace_debug_on_exit (specpdl_ptr - 1)) |
6c6f1994 | 2890 | val = call_debugger (list2 (Qexit, val)); |
2f592f95 | 2891 | specpdl_ptr--; |
db9f0278 JB |
2892 | return val; |
2893 | } | |
2894 | \f | |
2f7c71a1 | 2895 | static Lisp_Object |
defb1411 | 2896 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
2897 | { |
2898 | Lisp_Object args_left; | |
d311d28c PE |
2899 | ptrdiff_t i; |
2900 | EMACS_INT numargs; | |
db9f0278 JB |
2901 | register Lisp_Object *arg_vector; |
2902 | struct gcpro gcpro1, gcpro2, gcpro3; | |
db9f0278 | 2903 | register Lisp_Object tem; |
3a7a9129 | 2904 | USE_SAFE_ALLOCA; |
db9f0278 | 2905 | |
f66c7cf8 | 2906 | numargs = XFASTINT (Flength (args)); |
c5101a77 | 2907 | SAFE_ALLOCA_LISP (arg_vector, numargs); |
db9f0278 JB |
2908 | args_left = args; |
2909 | ||
2910 | GCPRO3 (*arg_vector, args_left, fun); | |
2911 | gcpro1.nvars = 0; | |
2912 | ||
c5101a77 | 2913 | for (i = 0; i < numargs; ) |
db9f0278 JB |
2914 | { |
2915 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
defb1411 | 2916 | tem = eval_sub (tem); |
db9f0278 JB |
2917 | arg_vector[i++] = tem; |
2918 | gcpro1.nvars = i; | |
2919 | } | |
2920 | ||
2921 | UNGCPRO; | |
2922 | ||
2f592f95 SM |
2923 | set_backtrace_args (specpdl_ptr - 1, arg_vector); |
2924 | set_backtrace_nargs (specpdl_ptr - 1, i); | |
c5101a77 | 2925 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
2926 | |
2927 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2f592f95 SM |
2928 | if (backtrace_debug_on_exit (specpdl_ptr - 1)) |
2929 | { | |
2930 | /* Don't do it again when we return to eval. */ | |
2931 | set_backtrace_debug_on_exit (specpdl_ptr - 1, false); | |
6c6f1994 | 2932 | tem = call_debugger (list2 (Qexit, tem)); |
2f592f95 | 2933 | } |
3a7a9129 | 2934 | SAFE_FREE (); |
db9f0278 JB |
2935 | return tem; |
2936 | } | |
2937 | ||
2938 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2939 | and return the result of evaluation. | |
2940 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2941 | ||
2901f1d1 | 2942 | static Lisp_Object |
f66c7cf8 | 2943 | funcall_lambda (Lisp_Object fun, ptrdiff_t nargs, |
c5101a77 | 2944 | register Lisp_Object *arg_vector) |
db9f0278 | 2945 | { |
defb1411 | 2946 | Lisp_Object val, syms_left, next, lexenv; |
d311d28c | 2947 | ptrdiff_t count = SPECPDL_INDEX (); |
f66c7cf8 | 2948 | ptrdiff_t i; |
1882aa38 | 2949 | bool optional, rest; |
db9f0278 | 2950 | |
90165123 | 2951 | if (CONSP (fun)) |
9ab90667 | 2952 | { |
defb1411 SM |
2953 | if (EQ (XCAR (fun), Qclosure)) |
2954 | { | |
2955 | fun = XCDR (fun); /* Drop `closure'. */ | |
2956 | lexenv = XCAR (fun); | |
23aba0ea | 2957 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
2958 | } |
2959 | else | |
2960 | lexenv = Qnil; | |
9ab90667 GM |
2961 | syms_left = XCDR (fun); |
2962 | if (CONSP (syms_left)) | |
2963 | syms_left = XCAR (syms_left); | |
2964 | else | |
734d55a2 | 2965 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 2966 | } |
90165123 | 2967 | else if (COMPILEDP (fun)) |
defb1411 | 2968 | { |
798cb644 SM |
2969 | syms_left = AREF (fun, COMPILED_ARGLIST); |
2970 | if (INTEGERP (syms_left)) | |
876c194c SM |
2971 | /* A byte-code object with a non-nil `push args' slot means we |
2972 | shouldn't bind any arguments, instead just call the byte-code | |
2973 | interpreter directly; it will push arguments as necessary. | |
2974 | ||
9173deec | 2975 | Byte-code objects with either a non-existent, or a nil value for |
876c194c SM |
2976 | the `push args' slot (the default), have dynamically-bound |
2977 | arguments, and use the argument-binding code below instead (as do | |
2978 | all interpreted functions, even lexically bound ones). */ | |
2979 | { | |
2980 | /* If we have not actually read the bytecode string | |
2981 | and constants vector yet, fetch them from the file. */ | |
2982 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
2983 | Ffetch_bytecode (fun); | |
2984 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
2985 | AREF (fun, COMPILED_CONSTANTS), | |
2986 | AREF (fun, COMPILED_STACK_DEPTH), | |
798cb644 | 2987 | syms_left, |
876c194c SM |
2988 | nargs, arg_vector); |
2989 | } | |
defb1411 SM |
2990 | lexenv = Qnil; |
2991 | } | |
9ab90667 | 2992 | else |
1088b922 | 2993 | emacs_abort (); |
db9f0278 | 2994 | |
9ab90667 GM |
2995 | i = optional = rest = 0; |
2996 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
2997 | { |
2998 | QUIT; | |
177c0ea7 | 2999 | |
9ab90667 | 3000 | next = XCAR (syms_left); |
8788120f | 3001 | if (!SYMBOLP (next)) |
734d55a2 | 3002 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3003 | |
db9f0278 JB |
3004 | if (EQ (next, Qand_rest)) |
3005 | rest = 1; | |
3006 | else if (EQ (next, Qand_optional)) | |
3007 | optional = 1; | |
db9f0278 | 3008 | else |
db9f0278 | 3009 | { |
e610eaca | 3010 | Lisp_Object arg; |
defb1411 SM |
3011 | if (rest) |
3012 | { | |
e610eaca | 3013 | arg = Flist (nargs - i, &arg_vector[i]); |
defb1411 SM |
3014 | i = nargs; |
3015 | } | |
3016 | else if (i < nargs) | |
e610eaca | 3017 | arg = arg_vector[i++]; |
b9598260 SM |
3018 | else if (!optional) |
3019 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3020 | else | |
e610eaca | 3021 | arg = Qnil; |
7200d79c | 3022 | |
b9598260 | 3023 | /* Bind the argument. */ |
876c194c | 3024 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 | 3025 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
e610eaca | 3026 | lexenv = Fcons (Fcons (next, arg), lexenv); |
b9598260 SM |
3027 | else |
3028 | /* Dynamically bind NEXT. */ | |
e610eaca | 3029 | specbind (next, arg); |
db9f0278 | 3030 | } |
db9f0278 JB |
3031 | } |
3032 | ||
9ab90667 | 3033 | if (!NILP (syms_left)) |
734d55a2 | 3034 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3035 | else if (i < nargs) |
734d55a2 | 3036 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3037 | |
b9598260 SM |
3038 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3039 | /* Instantiate a new lexical environment. */ | |
3040 | specbind (Qinternal_interpreter_environment, lexenv); | |
3041 | ||
90165123 | 3042 | if (CONSP (fun)) |
9ab90667 | 3043 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3044 | else |
ca248607 RS |
3045 | { |
3046 | /* If we have not actually read the bytecode string | |
3047 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3048 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3049 | Ffetch_bytecode (fun); |
b9598260 SM |
3050 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3051 | AREF (fun, COMPILED_CONSTANTS), | |
3052 | AREF (fun, COMPILED_STACK_DEPTH), | |
3053 | Qnil, 0, 0); | |
ca248607 | 3054 | } |
177c0ea7 | 3055 | |
db9f0278 JB |
3056 | return unbind_to (count, val); |
3057 | } | |
661c7d6e KH |
3058 | |
3059 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3060 | 1, 1, 0, |
3061 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3062 | (Lisp_Object object) |
661c7d6e KH |
3063 | { |
3064 | Lisp_Object tem; | |
3065 | ||
845975f5 | 3066 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3067 | { |
845975f5 | 3068 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3069 | if (!CONSP (tem)) |
845975f5 SM |
3070 | { |
3071 | tem = AREF (object, COMPILED_BYTECODE); | |
3072 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3073 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3074 | else |
3075 | error ("Invalid byte code"); | |
3076 | } | |
3ae565b3 SM |
3077 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3078 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3079 | } |
3080 | return object; | |
3081 | } | |
db9f0278 | 3082 | \f |
2f592f95 SM |
3083 | /* Return true if SYMBOL currently has a let-binding |
3084 | which was made in the buffer that is now current. */ | |
3085 | ||
3086 | bool | |
3087 | let_shadows_buffer_binding_p (struct Lisp_Symbol *symbol) | |
db9f0278 | 3088 | { |
9349e5f7 | 3089 | union specbinding *p; |
2f592f95 SM |
3090 | Lisp_Object buf = Fcurrent_buffer (); |
3091 | ||
3092 | for (p = specpdl_ptr; p > specpdl; ) | |
3093 | if ((--p)->kind > SPECPDL_LET) | |
3094 | { | |
3095 | struct Lisp_Symbol *let_bound_symbol = XSYMBOL (specpdl_symbol (p)); | |
3096 | eassert (let_bound_symbol->redirect != SYMBOL_VARALIAS); | |
3097 | if (symbol == let_bound_symbol | |
3098 | && EQ (specpdl_where (p), buf)) | |
3099 | return 1; | |
3100 | } | |
3101 | ||
3102 | return 0; | |
3103 | } | |
3104 | ||
3105 | bool | |
3106 | let_shadows_global_binding_p (Lisp_Object symbol) | |
3107 | { | |
9349e5f7 | 3108 | union specbinding *p; |
2f592f95 SM |
3109 | |
3110 | for (p = specpdl_ptr; p > specpdl; ) | |
3111 | if ((--p)->kind >= SPECPDL_LET && EQ (specpdl_symbol (p), symbol)) | |
3112 | return 1; | |
3113 | ||
3114 | return 0; | |
db9f0278 JB |
3115 | } |
3116 | ||
f6d62986 | 3117 | /* `specpdl_ptr->symbol' is a field which describes which variable is |
4e2db1fe SM |
3118 | let-bound, so it can be properly undone when we unbind_to. |
3119 | It can have the following two shapes: | |
3120 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3121 | a symbol that is not buffer-local (at least at the time | |
3122 | the let binding started). Note also that it should not be | |
3123 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3124 | to record V2 here). | |
3125 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3126 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3127 | which buffer is affected (or nil if the let-binding affects the | |
3128 | global value of the variable) and BUFFER tells us which buffer was | |
3129 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3130 | BUFFER did not yet have a buffer-local value). */ | |
3131 | ||
db9f0278 | 3132 | void |
d3da34e0 | 3133 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3134 | { |
ce5b453a SM |
3135 | struct Lisp_Symbol *sym; |
3136 | ||
b7826503 | 3137 | CHECK_SYMBOL (symbol); |
ce5b453a | 3138 | sym = XSYMBOL (symbol); |
719177b3 | 3139 | |
ce5b453a SM |
3140 | start: |
3141 | switch (sym->redirect) | |
719177b3 | 3142 | { |
ce5b453a SM |
3143 | case SYMBOL_VARALIAS: |
3144 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3145 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3146 | /* The most common case is that of a non-constant symbol with a |
3147 | trivial value. Make that as fast as we can. */ | |
9349e5f7 PE |
3148 | specpdl_ptr->let.kind = SPECPDL_LET; |
3149 | specpdl_ptr->let.symbol = symbol; | |
3150 | specpdl_ptr->let.old_value = SYMBOL_VAL (sym); | |
5e301d76 | 3151 | grow_specpdl (); |
bb8e180f AS |
3152 | if (!sym->constant) |
3153 | SET_SYMBOL_VAL (sym, value); | |
3154 | else | |
3155 | set_internal (symbol, value, Qnil, 1); | |
3156 | break; | |
4e2db1fe SM |
3157 | case SYMBOL_LOCALIZED: |
3158 | if (SYMBOL_BLV (sym)->frame_local) | |
3159 | error ("Frame-local vars cannot be let-bound"); | |
3160 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3161 | { |
3162 | Lisp_Object ovalue = find_symbol_value (symbol); | |
9349e5f7 PE |
3163 | specpdl_ptr->let.kind = SPECPDL_LET_LOCAL; |
3164 | specpdl_ptr->let.symbol = symbol; | |
3165 | specpdl_ptr->let.old_value = ovalue; | |
3166 | specpdl_ptr->let.where = Fcurrent_buffer (); | |
ce5b453a SM |
3167 | |
3168 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
2f592f95 | 3169 | || (EQ (SYMBOL_BLV (sym)->where, Fcurrent_buffer ()))); |
ce5b453a | 3170 | |
2f592f95 SM |
3171 | if (sym->redirect == SYMBOL_LOCALIZED) |
3172 | { | |
3173 | if (!blv_found (SYMBOL_BLV (sym))) | |
9349e5f7 | 3174 | specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT; |
2f592f95 SM |
3175 | } |
3176 | else if (BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
ce5b453a | 3177 | { |
ce5b453a SM |
3178 | /* If SYMBOL is a per-buffer variable which doesn't have a |
3179 | buffer-local value here, make the `let' change the global | |
3180 | value by changing the value of SYMBOL in all buffers not | |
3181 | having their own value. This is consistent with what | |
3182 | happens with other buffer-local variables. */ | |
2f592f95 | 3183 | if (NILP (Flocal_variable_p (symbol, Qnil))) |
ce5b453a | 3184 | { |
9349e5f7 | 3185 | specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT; |
5e301d76 | 3186 | grow_specpdl (); |
ce5b453a SM |
3187 | Fset_default (symbol, value); |
3188 | return; | |
3189 | } | |
3190 | } | |
3191 | else | |
9349e5f7 | 3192 | specpdl_ptr->let.kind = SPECPDL_LET; |
ce5b453a | 3193 | |
5e301d76 | 3194 | grow_specpdl (); |
94b612ad | 3195 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3196 | break; |
3197 | } | |
1088b922 | 3198 | default: emacs_abort (); |
9ab90667 | 3199 | } |
db9f0278 JB |
3200 | } |
3201 | ||
f4b1eb36 PE |
3202 | /* Push unwind-protect entries of various types. */ |
3203 | ||
db9f0278 | 3204 | void |
27e498e6 | 3205 | record_unwind_protect (void (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3206 | { |
9349e5f7 PE |
3207 | specpdl_ptr->unwind.kind = SPECPDL_UNWIND; |
3208 | specpdl_ptr->unwind.func = function; | |
3209 | specpdl_ptr->unwind.arg = arg; | |
5e301d76 | 3210 | grow_specpdl (); |
db9f0278 JB |
3211 | } |
3212 | ||
27e498e6 PE |
3213 | void |
3214 | record_unwind_protect_ptr (void (*function) (void *), void *arg) | |
3215 | { | |
3216 | specpdl_ptr->unwind_ptr.kind = SPECPDL_UNWIND_PTR; | |
3217 | specpdl_ptr->unwind_ptr.func = function; | |
3218 | specpdl_ptr->unwind_ptr.arg = arg; | |
3219 | grow_specpdl (); | |
3220 | } | |
3221 | ||
3222 | void | |
3223 | record_unwind_protect_int (void (*function) (int), int arg) | |
3224 | { | |
3225 | specpdl_ptr->unwind_int.kind = SPECPDL_UNWIND_INT; | |
3226 | specpdl_ptr->unwind_int.func = function; | |
3227 | specpdl_ptr->unwind_int.arg = arg; | |
3228 | grow_specpdl (); | |
3229 | } | |
3230 | ||
3231 | void | |
3232 | record_unwind_protect_void (void (*function) (void)) | |
3233 | { | |
3234 | specpdl_ptr->unwind_void.kind = SPECPDL_UNWIND_VOID; | |
3235 | specpdl_ptr->unwind_void.func = function; | |
3236 | grow_specpdl (); | |
3237 | } | |
3238 | ||
a0931322 PE |
3239 | static void |
3240 | do_nothing (void) | |
3241 | {} | |
3242 | ||
f4b1eb36 PE |
3243 | /* Push an unwind-protect entry that does nothing, so that |
3244 | set_unwind_protect_ptr can overwrite it later. */ | |
3245 | ||
3246 | void | |
3247 | record_unwind_protect_nothing (void) | |
3248 | { | |
3249 | record_unwind_protect_void (do_nothing); | |
3250 | } | |
3251 | ||
3252 | /* Clear the unwind-protect entry COUNT, so that it does nothing. | |
3253 | It need not be at the top of the stack. */ | |
3254 | ||
a0931322 PE |
3255 | void |
3256 | clear_unwind_protect (ptrdiff_t count) | |
3257 | { | |
3258 | union specbinding *p = specpdl + count; | |
3259 | p->unwind_void.kind = SPECPDL_UNWIND_VOID; | |
3260 | p->unwind_void.func = do_nothing; | |
3261 | } | |
3262 | ||
f4b1eb36 PE |
3263 | /* Set the unwind-protect entry COUNT so that it invokes FUNC (ARG). |
3264 | It need not be at the top of the stack. Discard the entry's | |
3265 | previous value without invoking it. */ | |
3266 | ||
a0931322 PE |
3267 | void |
3268 | set_unwind_protect_ptr (ptrdiff_t count, void (*func) (void *), void *arg) | |
3269 | { | |
3270 | union specbinding *p = specpdl + count; | |
3271 | p->unwind_ptr.kind = SPECPDL_UNWIND_PTR; | |
3272 | p->unwind_ptr.func = func; | |
3273 | p->unwind_ptr.arg = arg; | |
3274 | } | |
3275 | ||
f4b1eb36 PE |
3276 | /* Pop and execute entries from the unwind-protect stack until the |
3277 | depth COUNT is reached. Return VALUE. */ | |
3278 | ||
db9f0278 | 3279 | Lisp_Object |
d311d28c | 3280 | unbind_to (ptrdiff_t count, Lisp_Object value) |
db9f0278 | 3281 | { |
5a073f50 KS |
3282 | Lisp_Object quitf = Vquit_flag; |
3283 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3284 | |
5a073f50 | 3285 | GCPRO2 (value, quitf); |
db9f0278 JB |
3286 | Vquit_flag = Qnil; |
3287 | ||
3288 | while (specpdl_ptr != specpdl + count) | |
3289 | { | |
9349e5f7 PE |
3290 | /* Decrement specpdl_ptr before we do the work to unbind it, so |
3291 | that an error in unbinding won't try to unbind the same entry | |
3292 | again. Take care to copy any parts of the binding needed | |
3293 | before invoking any code that can make more bindings. */ | |
eb700b82 | 3294 | |
9349e5f7 | 3295 | specpdl_ptr--; |
611a8f8c | 3296 | |
9349e5f7 | 3297 | switch (specpdl_ptr->kind) |
719177b3 | 3298 | { |
2f592f95 | 3299 | case SPECPDL_UNWIND: |
27e498e6 PE |
3300 | specpdl_ptr->unwind.func (specpdl_ptr->unwind.arg); |
3301 | break; | |
3302 | case SPECPDL_UNWIND_PTR: | |
3303 | specpdl_ptr->unwind_ptr.func (specpdl_ptr->unwind_ptr.arg); | |
3304 | break; | |
3305 | case SPECPDL_UNWIND_INT: | |
3306 | specpdl_ptr->unwind_int.func (specpdl_ptr->unwind_int.arg); | |
3307 | break; | |
3308 | case SPECPDL_UNWIND_VOID: | |
3309 | specpdl_ptr->unwind_void.func (); | |
2f592f95 | 3310 | break; |
56ea7291 SM |
3311 | case SPECPDL_BACKTRACE: |
3312 | break; | |
2f592f95 SM |
3313 | case SPECPDL_LET: |
3314 | /* If variable has a trivial value (no forwarding), we can | |
3315 | just set it. No need to check for constant symbols here, | |
3316 | since that was already done by specbind. */ | |
9349e5f7 | 3317 | if (XSYMBOL (specpdl_symbol (specpdl_ptr))->redirect |
2f592f95 | 3318 | == SYMBOL_PLAINVAL) |
9349e5f7 PE |
3319 | SET_SYMBOL_VAL (XSYMBOL (specpdl_symbol (specpdl_ptr)), |
3320 | specpdl_old_value (specpdl_ptr)); | |
2f592f95 SM |
3321 | else |
3322 | /* NOTE: we only ever come here if make_local_foo was used for | |
3323 | the first time on this var within this let. */ | |
9349e5f7 PE |
3324 | Fset_default (specpdl_symbol (specpdl_ptr), |
3325 | specpdl_old_value (specpdl_ptr)); | |
2f592f95 | 3326 | break; |
56ea7291 SM |
3327 | case SPECPDL_LET_DEFAULT: |
3328 | Fset_default (specpdl_symbol (specpdl_ptr), | |
3329 | specpdl_old_value (specpdl_ptr)); | |
2f592f95 SM |
3330 | break; |
3331 | case SPECPDL_LET_LOCAL: | |
56ea7291 | 3332 | { |
9349e5f7 PE |
3333 | Lisp_Object symbol = specpdl_symbol (specpdl_ptr); |
3334 | Lisp_Object where = specpdl_where (specpdl_ptr); | |
3335 | Lisp_Object old_value = specpdl_old_value (specpdl_ptr); | |
2f592f95 SM |
3336 | eassert (BUFFERP (where)); |
3337 | ||
2f592f95 SM |
3338 | /* If this was a local binding, reset the value in the appropriate |
3339 | buffer, but only if that buffer's binding still exists. */ | |
56ea7291 | 3340 | if (!NILP (Flocal_variable_p (symbol, where))) |
9349e5f7 | 3341 | set_internal (symbol, old_value, where, 1); |
2f592f95 SM |
3342 | } |
3343 | break; | |
719177b3 | 3344 | } |
db9f0278 | 3345 | } |
177c0ea7 | 3346 | |
5a073f50 KS |
3347 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3348 | Vquit_flag = quitf; | |
db9f0278 JB |
3349 | |
3350 | UNGCPRO; | |
db9f0278 JB |
3351 | return value; |
3352 | } | |
b9598260 | 3353 | |
4a330052 | 3354 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3355 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3356 | A special variable is one that will be bound dynamically, even in a | |
3357 | context where binding is lexical by default. */) | |
c566235d | 3358 | (Lisp_Object symbol) |
b9598260 SM |
3359 | { |
3360 | CHECK_SYMBOL (symbol); | |
3361 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3362 | } | |
3363 | ||
db9f0278 | 3364 | \f |
db9f0278 | 3365 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3366 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3367 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3368 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 | 3369 | { |
9349e5f7 | 3370 | union specbinding *pdl = backtrace_top (); |
d311d28c | 3371 | register EMACS_INT i; |
db9f0278 | 3372 | |
b7826503 | 3373 | CHECK_NUMBER (level); |
db9f0278 | 3374 | |
2f592f95 SM |
3375 | for (i = 0; backtrace_p (pdl) && i < XINT (level); i++) |
3376 | pdl = backtrace_next (pdl); | |
db9f0278 | 3377 | |
2f592f95 SM |
3378 | if (backtrace_p (pdl)) |
3379 | set_backtrace_debug_on_exit (pdl, !NILP (flag)); | |
db9f0278 JB |
3380 | |
3381 | return flag; | |
3382 | } | |
3383 | ||
3384 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3385 | doc: /* Print a trace of Lisp function calls currently active. |
3386 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3387 | (void) |
db9f0278 | 3388 | { |
9349e5f7 | 3389 | union specbinding *pdl = backtrace_top (); |
db9f0278 | 3390 | Lisp_Object tem; |
d4b6d95d | 3391 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3392 | |
d4b6d95d LMI |
3393 | if (NILP (Vprint_level)) |
3394 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 | 3395 | |
2f592f95 | 3396 | while (backtrace_p (pdl)) |
db9f0278 | 3397 | { |
2f592f95 SM |
3398 | write_string (backtrace_debug_on_exit (pdl) ? "* " : " ", 2); |
3399 | if (backtrace_nargs (pdl) == UNEVALLED) | |
db9f0278 | 3400 | { |
2f592f95 SM |
3401 | Fprin1 (Fcons (backtrace_function (pdl), *backtrace_args (pdl)), |
3402 | Qnil); | |
b6703b02 | 3403 | write_string ("\n", -1); |
db9f0278 JB |
3404 | } |
3405 | else | |
3406 | { | |
2f592f95 | 3407 | tem = backtrace_function (pdl); |
f6d62986 | 3408 | Fprin1 (tem, Qnil); /* This can QUIT. */ |
db9f0278 | 3409 | write_string ("(", -1); |
2f592f95 SM |
3410 | { |
3411 | ptrdiff_t i; | |
3412 | for (i = 0; i < backtrace_nargs (pdl); i++) | |
3413 | { | |
3414 | if (i) write_string (" ", -1); | |
3415 | Fprin1 (backtrace_args (pdl)[i], Qnil); | |
3416 | } | |
3417 | } | |
b6703b02 | 3418 | write_string (")\n", -1); |
db9f0278 | 3419 | } |
2f592f95 | 3420 | pdl = backtrace_next (pdl); |
db9f0278 JB |
3421 | } |
3422 | ||
d4b6d95d | 3423 | Vprint_level = old_print_level; |
db9f0278 JB |
3424 | return Qnil; |
3425 | } | |
3426 | ||
d5a7a9d9 | 3427 | static union specbinding * |
56ea7291 SM |
3428 | get_backtrace_frame (Lisp_Object nframes, Lisp_Object base) |
3429 | { | |
3430 | union specbinding *pdl = backtrace_top (); | |
3431 | register EMACS_INT i; | |
3432 | ||
3433 | CHECK_NATNUM (nframes); | |
3434 | ||
3435 | if (!NILP (base)) | |
3436 | { /* Skip up to `base'. */ | |
3437 | base = Findirect_function (base, Qt); | |
3438 | while (backtrace_p (pdl) | |
3439 | && !EQ (base, Findirect_function (backtrace_function (pdl), Qt))) | |
3440 | pdl = backtrace_next (pdl); | |
3441 | } | |
3442 | ||
3443 | /* Find the frame requested. */ | |
3444 | for (i = XFASTINT (nframes); i > 0 && backtrace_p (pdl); i--) | |
3445 | pdl = backtrace_next (pdl); | |
3446 | ||
3447 | return pdl; | |
3448 | } | |
3449 | ||
3450 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 2, NULL, | |
9dbc9081 PJ |
3451 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3452 | If that frame has not evaluated the arguments yet (or is a special form), | |
3453 | the value is (nil FUNCTION ARG-FORMS...). | |
3454 | If that frame has evaluated its arguments and called its function already, | |
3455 | the value is (t FUNCTION ARG-VALUES...). | |
3456 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3457 | FUNCTION is whatever was supplied as car of evaluated list, | |
3458 | or a lambda expression for macro calls. | |
56ea7291 SM |
3459 | If NFRAMES is more than the number of frames, the value is nil. |
3460 | If BASE is non-nil, it should be a function and NFRAMES counts from its | |
3461 | nearest activation frame. */) | |
3462 | (Lisp_Object nframes, Lisp_Object base) | |
db9f0278 | 3463 | { |
56ea7291 | 3464 | union specbinding *pdl = get_backtrace_frame (nframes, base); |
db9f0278 | 3465 | |
2f592f95 | 3466 | if (!backtrace_p (pdl)) |
db9f0278 | 3467 | return Qnil; |
2f592f95 SM |
3468 | if (backtrace_nargs (pdl) == UNEVALLED) |
3469 | return Fcons (Qnil, | |
3470 | Fcons (backtrace_function (pdl), *backtrace_args (pdl))); | |
db9f0278 JB |
3471 | else |
3472 | { | |
2f592f95 | 3473 | Lisp_Object tem = Flist (backtrace_nargs (pdl), backtrace_args (pdl)); |
db9f0278 | 3474 | |
2f592f95 | 3475 | return Fcons (Qt, Fcons (backtrace_function (pdl), tem)); |
db9f0278 JB |
3476 | } |
3477 | } | |
a2ff3819 | 3478 | |
56ea7291 SM |
3479 | /* For backtrace-eval, we want to temporarily unwind the last few elements of |
3480 | the specpdl stack, and then rewind them. We store the pre-unwind values | |
3481 | directly in the pre-existing specpdl elements (i.e. we swap the current | |
3482 | value and the old value stored in the specpdl), kind of like the inplace | |
3483 | pointer-reversal trick. As it turns out, the rewind does the same as the | |
94fea300 | 3484 | unwind, except it starts from the other end of the specpdl stack, so we use |
56ea7291 | 3485 | the same function for both unwind and rewind. */ |
d5a7a9d9 | 3486 | static void |
56ea7291 SM |
3487 | backtrace_eval_unrewind (int distance) |
3488 | { | |
3489 | union specbinding *tmp = specpdl_ptr; | |
3490 | int step = -1; | |
3491 | if (distance < 0) | |
3492 | { /* It's a rewind rather than unwind. */ | |
3493 | tmp += distance - 1; | |
3494 | step = 1; | |
3495 | distance = -distance; | |
3496 | } | |
3497 | ||
3498 | for (; distance > 0; distance--) | |
3499 | { | |
3500 | tmp += step; | |
3501 | /* */ | |
3502 | switch (tmp->kind) | |
3503 | { | |
3504 | /* FIXME: Ideally we'd like to "temporarily unwind" (some of) those | |
3505 | unwind_protect, but the problem is that we don't know how to | |
3506 | rewind them afterwards. */ | |
3507 | case SPECPDL_UNWIND: | |
3508 | case SPECPDL_UNWIND_PTR: | |
3509 | case SPECPDL_UNWIND_INT: | |
3510 | case SPECPDL_UNWIND_VOID: | |
3511 | case SPECPDL_BACKTRACE: | |
3512 | break; | |
3513 | case SPECPDL_LET: | |
3514 | /* If variable has a trivial value (no forwarding), we can | |
3515 | just set it. No need to check for constant symbols here, | |
3516 | since that was already done by specbind. */ | |
3517 | if (XSYMBOL (specpdl_symbol (tmp))->redirect | |
3518 | == SYMBOL_PLAINVAL) | |
3519 | { | |
3520 | struct Lisp_Symbol *sym = XSYMBOL (specpdl_symbol (tmp)); | |
3521 | Lisp_Object old_value = specpdl_old_value (tmp); | |
3522 | set_specpdl_old_value (tmp, SYMBOL_VAL (sym)); | |
3523 | SET_SYMBOL_VAL (sym, old_value); | |
3524 | break; | |
3525 | } | |
3526 | else | |
d5a7a9d9 PE |
3527 | { |
3528 | /* FALLTHROUGH! | |
3529 | NOTE: we only ever come here if make_local_foo was used for | |
3530 | the first time on this var within this let. */ | |
3531 | } | |
56ea7291 SM |
3532 | case SPECPDL_LET_DEFAULT: |
3533 | { | |
3534 | Lisp_Object sym = specpdl_symbol (tmp); | |
3535 | Lisp_Object old_value = specpdl_old_value (tmp); | |
3536 | set_specpdl_old_value (tmp, Fdefault_value (sym)); | |
3537 | Fset_default (sym, old_value); | |
3538 | } | |
3539 | break; | |
3540 | case SPECPDL_LET_LOCAL: | |
3541 | { | |
3542 | Lisp_Object symbol = specpdl_symbol (tmp); | |
3543 | Lisp_Object where = specpdl_where (tmp); | |
3544 | Lisp_Object old_value = specpdl_old_value (tmp); | |
3545 | eassert (BUFFERP (where)); | |
3546 | ||
3547 | /* If this was a local binding, reset the value in the appropriate | |
3548 | buffer, but only if that buffer's binding still exists. */ | |
3549 | if (!NILP (Flocal_variable_p (symbol, where))) | |
3550 | { | |
3551 | set_specpdl_old_value | |
3552 | (tmp, Fbuffer_local_value (symbol, where)); | |
3553 | set_internal (symbol, old_value, where, 1); | |
3554 | } | |
3555 | } | |
3556 | break; | |
3557 | } | |
3558 | } | |
3559 | } | |
3560 | ||
3561 | DEFUN ("backtrace-eval", Fbacktrace_eval, Sbacktrace_eval, 2, 3, NULL, | |
3562 | doc: /* Evaluate EXP in the context of some activation frame. | |
3563 | NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */) | |
3564 | (Lisp_Object exp, Lisp_Object nframes, Lisp_Object base) | |
3565 | { | |
3566 | union specbinding *pdl = get_backtrace_frame (nframes, base); | |
3567 | ptrdiff_t count = SPECPDL_INDEX (); | |
3568 | ptrdiff_t distance = specpdl_ptr - pdl; | |
3569 | eassert (distance >= 0); | |
3570 | ||
3571 | if (!backtrace_p (pdl)) | |
3572 | error ("Activation frame not found!"); | |
3573 | ||
3574 | backtrace_eval_unrewind (distance); | |
3575 | record_unwind_protect_int (backtrace_eval_unrewind, -distance); | |
3576 | ||
3577 | /* Use eval_sub rather than Feval since the main motivation behind | |
3578 | backtrace-eval is to be able to get/set the value of lexical variables | |
3579 | from the debugger. */ | |
3580 | return unbind_to (count, eval_sub (exp)); | |
3581 | } | |
db9f0278 | 3582 | \f |
4ce0541e | 3583 | void |
2f592f95 | 3584 | mark_specpdl (void) |
4ce0541e | 3585 | { |
9349e5f7 | 3586 | union specbinding *pdl; |
2f592f95 | 3587 | for (pdl = specpdl; pdl != specpdl_ptr; pdl++) |
4ce0541e | 3588 | { |
2f592f95 SM |
3589 | switch (pdl->kind) |
3590 | { | |
3591 | case SPECPDL_UNWIND: | |
3592 | mark_object (specpdl_arg (pdl)); | |
3593 | break; | |
9349e5f7 | 3594 | |
2f592f95 SM |
3595 | case SPECPDL_BACKTRACE: |
3596 | { | |
3597 | ptrdiff_t nargs = backtrace_nargs (pdl); | |
3598 | mark_object (backtrace_function (pdl)); | |
3599 | if (nargs == UNEVALLED) | |
3600 | nargs = 1; | |
3601 | while (nargs--) | |
3602 | mark_object (backtrace_args (pdl)[nargs]); | |
3603 | } | |
3604 | break; | |
9349e5f7 | 3605 | |
2f592f95 SM |
3606 | case SPECPDL_LET_DEFAULT: |
3607 | case SPECPDL_LET_LOCAL: | |
3608 | mark_object (specpdl_where (pdl)); | |
9349e5f7 | 3609 | /* Fall through. */ |
2f592f95 SM |
3610 | case SPECPDL_LET: |
3611 | mark_object (specpdl_symbol (pdl)); | |
3612 | mark_object (specpdl_old_value (pdl)); | |
9349e5f7 | 3613 | break; |
2f592f95 SM |
3614 | } |
3615 | } | |
3616 | } | |
3617 | ||
3618 | void | |
3619 | get_backtrace (Lisp_Object array) | |
3620 | { | |
9349e5f7 | 3621 | union specbinding *pdl = backtrace_next (backtrace_top ()); |
2f592f95 | 3622 | ptrdiff_t i = 0, asize = ASIZE (array); |
4ce0541e | 3623 | |
2f592f95 SM |
3624 | /* Copy the backtrace contents into working memory. */ |
3625 | for (; i < asize; i++) | |
3626 | { | |
3627 | if (backtrace_p (pdl)) | |
3628 | { | |
3629 | ASET (array, i, backtrace_function (pdl)); | |
3630 | pdl = backtrace_next (pdl); | |
3631 | } | |
4ce0541e | 3632 | else |
2f592f95 | 3633 | ASET (array, i, Qnil); |
4ce0541e SM |
3634 | } |
3635 | } | |
2f592f95 SM |
3636 | |
3637 | Lisp_Object backtrace_top_function (void) | |
3638 | { | |
9349e5f7 | 3639 | union specbinding *pdl = backtrace_top (); |
2f592f95 SM |
3640 | return (backtrace_p (pdl) ? backtrace_function (pdl) : Qnil); |
3641 | } | |
4ce0541e | 3642 | |
dfcf069d | 3643 | void |
d3da34e0 | 3644 | syms_of_eval (void) |
db9f0278 | 3645 | { |
29208e82 | 3646 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
fb7ada5f | 3647 | doc: /* Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3648 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3649 | an error is signaled. |
3650 | You can safely use a value considerably larger than the default value, | |
3651 | if that proves inconveniently small. However, if you increase it too far, | |
3652 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3653 | |
29208e82 | 3654 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
fb7ada5f | 3655 | doc: /* Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3656 | |
3657 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3658 | actual stack overflow in C, which would be fatal for Emacs. |
3659 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3660 | if that proves inconveniently small. However, if you increase it too far, |
3661 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3662 | |
29208e82 | 3663 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3664 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3665 | If the value is t, that means do an ordinary quit. |
3666 | If the value equals `throw-on-input', that means quit by throwing | |
3667 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3668 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3669 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3670 | Vquit_flag = Qnil; |
3671 | ||
29208e82 | 3672 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3673 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3674 | Note that `quit-flag' will still be set by typing C-g, | |
3675 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3676 | To prevent this happening, set `quit-flag' to nil | |
3677 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3678 | Vinhibit_quit = Qnil; |
3679 | ||
cd3520a4 JB |
3680 | DEFSYM (Qinhibit_quit, "inhibit-quit"); |
3681 | DEFSYM (Qautoload, "autoload"); | |
45b82ad0 | 3682 | DEFSYM (Qinhibit_debugger, "inhibit-debugger"); |
cd3520a4 JB |
3683 | DEFSYM (Qmacro, "macro"); |
3684 | DEFSYM (Qdeclare, "declare"); | |
177c0ea7 | 3685 | |
db9f0278 JB |
3686 | /* Note that the process handling also uses Qexit, but we don't want |
3687 | to staticpro it twice, so we just do it here. */ | |
cd3520a4 | 3688 | DEFSYM (Qexit, "exit"); |
b9598260 | 3689 | |
cd3520a4 JB |
3690 | DEFSYM (Qinteractive, "interactive"); |
3691 | DEFSYM (Qcommandp, "commandp"); | |
cd3520a4 JB |
3692 | DEFSYM (Qand_rest, "&rest"); |
3693 | DEFSYM (Qand_optional, "&optional"); | |
3694 | DEFSYM (Qclosure, "closure"); | |
3695 | DEFSYM (Qdebug, "debug"); | |
f01cbfdd | 3696 | |
45b82ad0 SM |
3697 | DEFVAR_LISP ("inhibit-debugger", Vinhibit_debugger, |
3698 | doc: /* Non-nil means never enter the debugger. | |
3699 | Normally set while the debugger is already active, to avoid recursive | |
3700 | invocations. */); | |
3701 | Vinhibit_debugger = Qnil; | |
3702 | ||
29208e82 | 3703 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
fb7ada5f | 3704 | doc: /* Non-nil means enter debugger if an error is signaled. |
9dbc9081 PJ |
3705 | Does not apply to errors handled by `condition-case' or those |
3706 | matched by `debug-ignored-errors'. | |
3707 | If the value is a list, an error only means to enter the debugger | |
3708 | if one of its condition symbols appears in the list. | |
3709 | When you evaluate an expression interactively, this variable | |
3710 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f | 3711 | The command `toggle-debug-on-error' toggles this. |
45b82ad0 | 3712 | See also the variable `debug-on-quit' and `inhibit-debugger'. */); |
128c0f66 | 3713 | Vdebug_on_error = Qnil; |
db9f0278 | 3714 | |
29208e82 | 3715 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
fb7ada5f | 3716 | doc: /* List of errors for which the debugger should not be called. |
9dbc9081 PJ |
3717 | Each element may be a condition-name or a regexp that matches error messages. |
3718 | If any element applies to a given error, that error skips the debugger | |
3719 | and just returns to top level. | |
3720 | This overrides the variable `debug-on-error'. | |
3721 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3722 | Vdebug_ignored_errors = Qnil; |
3723 | ||
29208e82 | 3724 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
fb7ada5f | 3725 | doc: /* Non-nil means enter debugger if quit is signaled (C-g, for example). |
82fc29a1 | 3726 | Does not apply if quit is handled by a `condition-case'. */); |
db9f0278 JB |
3727 | debug_on_quit = 0; |
3728 | ||
29208e82 | 3729 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3730 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3731 | |
29208e82 | 3732 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3733 | doc: /* Non-nil means debugger may continue execution. |
3734 | This is nil when the debugger is called under circumstances where it | |
3735 | might not be safe to continue. */); | |
dac204bc | 3736 | debugger_may_continue = 1; |
556d7314 | 3737 | |
29208e82 | 3738 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3739 | doc: /* Function to call to invoke debugger. |
3740 | If due to frame exit, args are `exit' and the value being returned; | |
3741 | this function's value will be returned instead of that. | |
3742 | If due to error, args are `error' and a list of the args to `signal'. | |
3743 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3744 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3745 | Vdebugger = Qnil; |
3746 | ||
29208e82 | 3747 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3748 | doc: /* If non-nil, this is a function for `signal' to call. |
3749 | It receives the same arguments that `signal' was given. | |
3750 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3751 | Vsignal_hook_function = Qnil; |
3752 | ||
29208e82 | 3753 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
fb7ada5f | 3754 | doc: /* Non-nil means call the debugger regardless of condition handlers. |
9dbc9081 PJ |
3755 | Note that `debug-on-error', `debug-on-quit' and friends |
3756 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3757 | Vdebug_on_signal = Qnil; |
61ede770 | 3758 | |
b38b1ec0 | 3759 | /* When lexical binding is being used, |
61b108cc | 3760 | Vinternal_interpreter_environment is non-nil, and contains an alist |
b38b1ec0 SM |
3761 | of lexically-bound variable, or (t), indicating an empty |
3762 | environment. The lisp name of this variable would be | |
3763 | `internal-interpreter-environment' if it weren't hidden. | |
3764 | Every element of this list can be either a cons (VAR . VAL) | |
3765 | specifying a lexical binding, or a single symbol VAR indicating | |
3766 | that this variable should use dynamic scoping. */ | |
61b108cc SM |
3767 | DEFSYM (Qinternal_interpreter_environment, |
3768 | "internal-interpreter-environment"); | |
b38b1ec0 SM |
3769 | DEFVAR_LISP ("internal-interpreter-environment", |
3770 | Vinternal_interpreter_environment, | |
b9598260 SM |
3771 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
3772 | When lexical binding is not being used, this variable is nil. | |
3773 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3774 | alist of active lexical bindings. */); | |
3775 | Vinternal_interpreter_environment = Qnil; | |
c80e3b4a | 3776 | /* Don't export this variable to Elisp, so no one can mess with it |
b38b1ec0 SM |
3777 | (Just imagine if someone makes it buffer-local). */ |
3778 | Funintern (Qinternal_interpreter_environment, Qnil); | |
b9598260 | 3779 | |
cd3520a4 | 3780 | DEFSYM (Vrun_hooks, "run-hooks"); |
db9f0278 JB |
3781 | |
3782 | staticpro (&Vautoload_queue); | |
3783 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3784 | staticpro (&Vsignaling_function); |
3785 | Vsignaling_function = Qnil; | |
db9f0278 | 3786 | |
d1f55f16 CY |
3787 | inhibit_lisp_code = Qnil; |
3788 | ||
db9f0278 JB |
3789 | defsubr (&Sor); |
3790 | defsubr (&Sand); | |
3791 | defsubr (&Sif); | |
3792 | defsubr (&Scond); | |
3793 | defsubr (&Sprogn); | |
3794 | defsubr (&Sprog1); | |
3795 | defsubr (&Sprog2); | |
3796 | defsubr (&Ssetq); | |
3797 | defsubr (&Squote); | |
3798 | defsubr (&Sfunction); | |
db9f0278 | 3799 | defsubr (&Sdefvar); |
19cebf5a | 3800 | defsubr (&Sdefvaralias); |
db9f0278 | 3801 | defsubr (&Sdefconst); |
513749ee | 3802 | defsubr (&Smake_var_non_special); |
db9f0278 JB |
3803 | defsubr (&Slet); |
3804 | defsubr (&SletX); | |
3805 | defsubr (&Swhile); | |
3806 | defsubr (&Smacroexpand); | |
3807 | defsubr (&Scatch); | |
3808 | defsubr (&Sthrow); | |
3809 | defsubr (&Sunwind_protect); | |
3810 | defsubr (&Scondition_case); | |
3811 | defsubr (&Ssignal); | |
db9f0278 JB |
3812 | defsubr (&Scommandp); |
3813 | defsubr (&Sautoload); | |
7abaf5cc | 3814 | defsubr (&Sautoload_do_load); |
db9f0278 JB |
3815 | defsubr (&Seval); |
3816 | defsubr (&Sapply); | |
3817 | defsubr (&Sfuncall); | |
ff936e53 SM |
3818 | defsubr (&Srun_hooks); |
3819 | defsubr (&Srun_hook_with_args); | |
3820 | defsubr (&Srun_hook_with_args_until_success); | |
3821 | defsubr (&Srun_hook_with_args_until_failure); | |
f6d62986 | 3822 | defsubr (&Srun_hook_wrapped); |
661c7d6e | 3823 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3824 | defsubr (&Sbacktrace_debug); |
3825 | defsubr (&Sbacktrace); | |
3826 | defsubr (&Sbacktrace_frame); | |
56ea7291 | 3827 | defsubr (&Sbacktrace_eval); |
4a330052 | 3828 | defsubr (&Sspecial_variable_p); |
b9598260 | 3829 | defsubr (&Sfunctionp); |
db9f0278 | 3830 | } |