Commit | Line | Data |
---|---|---|
db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
fa022909 | 2 | |
ba318903 PE |
3 | Copyright (C) 1985-1987, 1993-1995, 1999-2014 Free Software Foundation, |
4 | Inc. | |
db9f0278 JB |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
9ec0b715 | 8 | GNU Emacs is free software: you can redistribute it and/or modify |
db9f0278 | 9 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
db9f0278 JB |
12 | |
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
db9f0278 JB |
20 | |
21 | ||
18160b98 | 22 | #include <config.h> |
eb3f1cc8 | 23 | #include <limits.h> |
4e2fe2e6 | 24 | #include <stdio.h> |
db9f0278 | 25 | #include "lisp.h" |
9ac0d9e0 | 26 | #include "blockinput.h" |
db9f0278 | 27 | #include "commands.h" |
1f98fa48 | 28 | #include "keyboard.h" |
3648c842 | 29 | #include "dispextern.h" |
316bec86 BT |
30 | #include "guile.h" |
31 | ||
32 | static void unbind_once (void *ignore); | |
b70e1a2b | 33 | |
adf2aa61 | 34 | /* Chain of condition and catch handlers currently in effect. */ |
244ed907 | 35 | |
244ed907 PE |
36 | struct handler *handlerlist; |
37 | ||
15934ffa RS |
38 | #ifdef DEBUG_GCPRO |
39 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
40 | int gcpro_level; | |
41 | #endif | |
42 | ||
61b108cc | 43 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp; |
29208e82 | 44 | Lisp_Object Qinhibit_quit; |
955cbe7b PE |
45 | Lisp_Object Qand_rest; |
46 | static Lisp_Object Qand_optional; | |
45b82ad0 | 47 | static Lisp_Object Qinhibit_debugger; |
955cbe7b | 48 | static Lisp_Object Qdeclare; |
b9598260 SM |
49 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
50 | ||
ed008a6d | 51 | static Lisp_Object Qdebug; |
db9f0278 | 52 | |
6e6e9f08 RS |
53 | /* This holds either the symbol `run-hooks' or nil. |
54 | It is nil at an early stage of startup, and when Emacs | |
55 | is shutting down. */ | |
4c576a83 | 56 | |
db9f0278 JB |
57 | Lisp_Object Vrun_hooks; |
58 | ||
59 | /* Non-nil means record all fset's and provide's, to be undone | |
60 | if the file being autoloaded is not fully loaded. | |
61 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 62 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
63 | |
64 | Lisp_Object Vautoload_queue; | |
65 | ||
9349e5f7 PE |
66 | /* Current number of specbindings allocated in specpdl, not counting |
67 | the dummy entry specpdl[-1]. */ | |
4c576a83 | 68 | |
d311d28c | 69 | ptrdiff_t specpdl_size; |
db9f0278 | 70 | |
9349e5f7 PE |
71 | /* Pointer to beginning of specpdl. A dummy entry specpdl[-1] exists |
72 | only so that its address can be taken. */ | |
4c576a83 | 73 | |
9349e5f7 | 74 | union specbinding *specpdl; |
db9f0278 JB |
75 | |
76 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 77 | |
9349e5f7 | 78 | union specbinding *specpdl_ptr; |
db9f0278 | 79 | |
db9f0278 | 80 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 81 | |
adf2aa61 | 82 | EMACS_INT lisp_eval_depth; |
db9f0278 | 83 | |
be857679 | 84 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 85 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 86 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
87 | know that the debugger itself has an error, and we should just |
88 | signal the error instead of entering an infinite loop of debugger | |
89 | invocations. */ | |
4c576a83 | 90 | |
d311d28c | 91 | static EMACS_INT when_entered_debugger; |
db9f0278 | 92 | |
a2ff3819 GM |
93 | /* The function from which the last `signal' was called. Set in |
94 | Fsignal. */ | |
2f592f95 | 95 | /* FIXME: We should probably get rid of this! */ |
a2ff3819 GM |
96 | Lisp_Object Vsignaling_function; |
97 | ||
d1f55f16 CY |
98 | /* If non-nil, Lisp code must not be run since some part of Emacs is |
99 | in an inconsistent state. Currently, x-create-frame uses this to | |
100 | avoid triggering window-configuration-change-hook while the new | |
101 | frame is half-initialized. */ | |
102 | Lisp_Object inhibit_lisp_code; | |
103 | ||
f66c7cf8 | 104 | static Lisp_Object funcall_lambda (Lisp_Object, ptrdiff_t, Lisp_Object *); |
7200d79c | 105 | static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args); |
e46f2325 | 106 | |
84575e67 | 107 | static Lisp_Object |
9349e5f7 | 108 | specpdl_symbol (union specbinding *pdl) |
84575e67 PE |
109 | { |
110 | eassert (pdl->kind >= SPECPDL_LET); | |
9349e5f7 | 111 | return pdl->let.symbol; |
84575e67 PE |
112 | } |
113 | ||
114 | static Lisp_Object | |
9349e5f7 | 115 | specpdl_old_value (union specbinding *pdl) |
84575e67 PE |
116 | { |
117 | eassert (pdl->kind >= SPECPDL_LET); | |
9349e5f7 | 118 | return pdl->let.old_value; |
84575e67 PE |
119 | } |
120 | ||
56ea7291 SM |
121 | static void |
122 | set_specpdl_old_value (union specbinding *pdl, Lisp_Object val) | |
123 | { | |
124 | eassert (pdl->kind >= SPECPDL_LET); | |
125 | pdl->let.old_value = val; | |
126 | } | |
127 | ||
84575e67 | 128 | static Lisp_Object |
9349e5f7 | 129 | specpdl_where (union specbinding *pdl) |
84575e67 PE |
130 | { |
131 | eassert (pdl->kind > SPECPDL_LET); | |
9349e5f7 | 132 | return pdl->let.where; |
84575e67 PE |
133 | } |
134 | ||
316bec86 BT |
135 | struct handler * |
136 | make_catch_handler (Lisp_Object tag) | |
137 | { | |
138 | struct handler *c = xmalloc (sizeof (*c)); | |
139 | c->type = CATCHER; | |
140 | c->tag_or_ch = tag; | |
141 | c->val = Qnil; | |
142 | c->var = Qnil; | |
143 | c->body = Qnil; | |
144 | c->next = handlerlist; | |
145 | c->lisp_eval_depth = lisp_eval_depth; | |
316bec86 BT |
146 | c->interrupt_input_blocked = interrupt_input_blocked; |
147 | c->ptag = make_prompt_tag (); | |
148 | return c; | |
149 | } | |
150 | ||
151 | struct handler * | |
152 | make_condition_handler (Lisp_Object tag) | |
153 | { | |
154 | struct handler *c = xmalloc (sizeof (*c)); | |
155 | c->type = CONDITION_CASE; | |
156 | c->tag_or_ch = tag; | |
157 | c->val = Qnil; | |
158 | c->var = Qnil; | |
159 | c->body = Qnil; | |
160 | c->next = handlerlist; | |
161 | c->lisp_eval_depth = lisp_eval_depth; | |
316bec86 BT |
162 | c->interrupt_input_blocked = interrupt_input_blocked; |
163 | c->ptag = make_prompt_tag (); | |
164 | return c; | |
165 | } | |
2f592f95 | 166 | |
1bf3ed7c RT |
167 | static Lisp_Object eval_fn; |
168 | static Lisp_Object funcall_fn; | |
169 | ||
dfcf069d | 170 | void |
d3da34e0 | 171 | init_eval_once (void) |
db9f0278 | 172 | { |
98e8eae1 | 173 | enum { size = 50 }; |
9349e5f7 | 174 | union specbinding *pdlvec = xmalloc ((size + 1) * sizeof *specpdl); |
98e8eae1 | 175 | specpdl_size = size; |
9349e5f7 | 176 | specpdl = specpdl_ptr = pdlvec + 1; |
6588243d | 177 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
1bf3ed7c RT |
178 | max_specpdl_size = 10000; /* 1000 is not enough for CEDET's c-by.el. */ |
179 | max_lisp_eval_depth = 10000; | |
34d470ba RS |
180 | |
181 | Vrun_hooks = Qnil; | |
1bf3ed7c RT |
182 | |
183 | eval_fn = scm_c_public_ref ("language elisp runtime", "eval-elisp"); | |
184 | funcall_fn = scm_c_public_ref ("elisp-functions", "funcall"); | |
7a7dfc01 | 185 | |
4c103b64 | 186 | //scm_set_smob_apply (lisp_vectorlike_tag, apply_lambda, 0, 0, 1); |
db9f0278 JB |
187 | } |
188 | ||
316bec86 | 189 | static struct handler *handlerlist_sentinel; |
70de5e86 | 190 | |
dfcf069d | 191 | void |
d3da34e0 | 192 | init_eval (void) |
db9f0278 JB |
193 | { |
194 | specpdl_ptr = specpdl; | |
316bec86 BT |
195 | handlerlist_sentinel = make_catch_handler (Qunbound); |
196 | handlerlist = handlerlist_sentinel; | |
db9f0278 JB |
197 | Vquit_flag = Qnil; |
198 | debug_on_next_call = 0; | |
199 | lisp_eval_depth = 0; | |
87e21fbd | 200 | #ifdef DEBUG_GCPRO |
15934ffa | 201 | gcpro_level = 0; |
87e21fbd | 202 | #endif |
be857679 | 203 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 204 | when_entered_debugger = -1; |
db9f0278 JB |
205 | } |
206 | ||
f6d62986 | 207 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb | 208 | |
27e498e6 | 209 | static void |
d3da34e0 | 210 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
211 | { |
212 | max_specpdl_size = XINT (XCAR (data)); | |
213 | max_lisp_eval_depth = XINT (XCDR (data)); | |
214 | } | |
215 | ||
9cad4576 DA |
216 | static void grow_specpdl (void); |
217 | ||
9f5903bb RS |
218 | /* Call the Lisp debugger, giving it argument ARG. */ |
219 | ||
7f7e0167 | 220 | Lisp_Object |
d3da34e0 | 221 | call_debugger (Lisp_Object arg) |
db9f0278 | 222 | { |
1882aa38 | 223 | bool debug_while_redisplaying; |
3200038e | 224 | dynwind_begin (); |
3648c842 | 225 | Lisp_Object val; |
575593db DA |
226 | EMACS_INT old_depth = max_lisp_eval_depth; |
227 | /* Do not allow max_specpdl_size less than actual depth (Bug#16603). */ | |
316bec86 | 228 | EMACS_INT old_max = max_specpdl_size; |
9f5903bb RS |
229 | |
230 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
231 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
232 | ||
9cad4576 DA |
233 | /* Restore limits after leaving the debugger. */ |
234 | record_unwind_protect (restore_stack_limits, | |
235 | Fcons (make_number (old_max), | |
236 | make_number (old_depth))); | |
177c0ea7 | 237 | |
d148e14d | 238 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
239 | if (display_hourglass_p) |
240 | cancel_hourglass (); | |
237c23b0 GM |
241 | #endif |
242 | ||
db9f0278 | 243 | debug_on_next_call = 0; |
be857679 | 244 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
245 | |
246 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
247 | displayed if the debugger is invoked during redisplay. */ | |
248 | debug_while_redisplaying = redisplaying_p; | |
249 | redisplaying_p = 0; | |
556d7314 GM |
250 | specbind (intern ("debugger-may-continue"), |
251 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 252 | specbind (Qinhibit_redisplay, Qnil); |
45b82ad0 | 253 | specbind (Qinhibit_debugger, Qt); |
9db6f6b4 GM |
254 | |
255 | #if 0 /* Binding this prevents execution of Lisp code during | |
256 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 257 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 258 | #endif |
177c0ea7 | 259 | |
3648c842 GM |
260 | val = apply1 (Vdebugger, arg); |
261 | ||
262 | /* Interrupting redisplay and resuming it later is not safe under | |
263 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 264 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
265 | if (debug_while_redisplaying) |
266 | Ftop_level (); | |
267 | ||
3200038e BT |
268 | dynwind_end (); |
269 | return val; | |
db9f0278 | 270 | } |
db9f0278 | 271 | \f |
707dd106 RT |
272 | static Lisp_Object |
273 | Fprogn (Lisp_Object body) | |
db9f0278 | 274 | { |
27e498e6 | 275 | Lisp_Object val = Qnil; |
db9f0278 JB |
276 | struct gcpro gcpro1; |
277 | ||
27e498e6 | 278 | GCPRO1 (body); |
db9f0278 | 279 | |
27e498e6 | 280 | while (CONSP (body)) |
db9f0278 | 281 | { |
27e498e6 PE |
282 | val = eval_sub (XCAR (body)); |
283 | body = XCDR (body); | |
db9f0278 | 284 | } |
db9f0278 JB |
285 | |
286 | UNGCPRO; | |
287 | return val; | |
288 | } | |
289 | ||
02c66599 | 290 | /* Evaluate BODY sequentially, discarding its value. Suitable for |
27e498e6 PE |
291 | record_unwind_protect. */ |
292 | ||
293 | void | |
294 | unwind_body (Lisp_Object body) | |
295 | { | |
296 | Fprogn (body); | |
297 | } | |
298 | ||
1bf3ed7c RT |
299 | Lisp_Object |
300 | Ffunction (Lisp_Object args) | |
db9f0278 | 301 | { |
b9598260 SM |
302 | Lisp_Object quoted = XCAR (args); |
303 | ||
16b0520a | 304 | if (CONSP (XCDR (args))) |
1283140e | 305 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); |
b9598260 SM |
306 | |
307 | if (!NILP (Vinternal_interpreter_environment) | |
308 | && CONSP (quoted) | |
309 | && EQ (XCAR (quoted), Qlambda)) | |
310 | /* This is a lambda expression within a lexical environment; | |
311 | return an interpreted closure instead of a simple lambda. */ | |
23aba0ea SM |
312 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, |
313 | XCDR (quoted))); | |
b9598260 SM |
314 | else |
315 | /* Simply quote the argument. */ | |
316 | return quoted; | |
db9f0278 JB |
317 | } |
318 | ||
1848d15d | 319 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 320 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 321 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 322 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
323 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
324 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
325 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
326 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 327 | The return value is BASE-VARIABLE. */) |
5842a27b | 328 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a | 329 | { |
db633ecc | 330 | sym_t sym; |
1848d15d | 331 | |
4a9308b8 JB |
332 | CHECK_SYMBOL (new_alias); |
333 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 334 | |
4a9308b8 | 335 | sym = XSYMBOL (new_alias); |
ce5b453a | 336 | |
db633ecc | 337 | if (SYMBOL_CONSTANT (sym)) |
178f2507 SM |
338 | /* Not sure why, but why not? */ |
339 | error ("Cannot make a constant an alias"); | |
ce5b453a | 340 | |
db633ecc | 341 | switch (SYMBOL_REDIRECT (sym)) |
ce5b453a SM |
342 | { |
343 | case SYMBOL_FORWARDED: | |
344 | error ("Cannot make an internal variable an alias"); | |
345 | case SYMBOL_LOCALIZED: | |
346 | error ("Don't know how to make a localized variable an alias"); | |
347 | } | |
348 | ||
dd60787c | 349 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
350 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
351 | so that old-code that affects n_a before the aliasing is setup | |
352 | still works. */ | |
353 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 354 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
355 | |
356 | { | |
9349e5f7 | 357 | union specbinding *p; |
ce5b453a | 358 | |
bc985141 | 359 | for (p = specpdl_ptr; p > specpdl; ) |
2f592f95 SM |
360 | if ((--p)->kind >= SPECPDL_LET |
361 | && (EQ (new_alias, specpdl_symbol (p)))) | |
ce5b453a SM |
362 | error ("Don't know how to make a let-bound variable an alias"); |
363 | } | |
364 | ||
db633ecc BT |
365 | SET_SYMBOL_DECLARED_SPECIAL (sym, 1); |
366 | SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (base_variable), 1); | |
367 | SET_SYMBOL_REDIRECT (sym, SYMBOL_VARALIAS); | |
ce5b453a | 368 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); |
db633ecc | 369 | SET_SYMBOL_CONSTANT (sym, SYMBOL_CONSTANT_P (base_variable)); |
4a9308b8 | 370 | LOADHIST_ATTACH (new_alias); |
ce5b453a SM |
371 | /* Even if docstring is nil: remove old docstring. */ |
372 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 373 | |
4a9308b8 | 374 | return base_variable; |
19cebf5a GM |
375 | } |
376 | ||
a104f656 SM |
377 | static union specbinding * |
378 | default_toplevel_binding (Lisp_Object symbol) | |
379 | { | |
380 | union specbinding *binding = NULL; | |
381 | union specbinding *pdl = specpdl_ptr; | |
382 | while (pdl > specpdl) | |
383 | { | |
384 | switch ((--pdl)->kind) | |
385 | { | |
386 | case SPECPDL_LET_DEFAULT: | |
387 | case SPECPDL_LET: | |
388 | if (EQ (specpdl_symbol (pdl), symbol)) | |
389 | binding = pdl; | |
390 | break; | |
391 | } | |
392 | } | |
393 | return binding; | |
394 | } | |
395 | ||
396 | DEFUN ("default-toplevel-value", Fdefault_toplevel_value, Sdefault_toplevel_value, 1, 1, 0, | |
397 | doc: /* Return SYMBOL's toplevel default value. | |
398 | "Toplevel" means outside of any let binding. */) | |
399 | (Lisp_Object symbol) | |
400 | { | |
401 | union specbinding *binding = default_toplevel_binding (symbol); | |
402 | Lisp_Object value | |
403 | = binding ? specpdl_old_value (binding) : Fdefault_value (symbol); | |
404 | if (!EQ (value, Qunbound)) | |
405 | return value; | |
406 | xsignal1 (Qvoid_variable, symbol); | |
407 | } | |
408 | ||
409 | DEFUN ("set-default-toplevel-value", Fset_default_toplevel_value, | |
410 | Sset_default_toplevel_value, 2, 2, 0, | |
411 | doc: /* Set SYMBOL's toplevel default value to VALUE. | |
412 | "Toplevel" means outside of any let binding. */) | |
413 | (Lisp_Object symbol, Lisp_Object value) | |
414 | { | |
415 | union specbinding *binding = default_toplevel_binding (symbol); | |
416 | if (binding) | |
417 | set_specpdl_old_value (binding, value); | |
418 | else | |
419 | Fset_default (symbol, value); | |
420 | return Qnil; | |
421 | } | |
19cebf5a | 422 | |
513749ee SM |
423 | /* Make SYMBOL lexically scoped. */ |
424 | DEFUN ("internal-make-var-non-special", Fmake_var_non_special, | |
425 | Smake_var_non_special, 1, 1, 0, | |
426 | doc: /* Internal function. */) | |
427 | (Lisp_Object symbol) | |
428 | { | |
429 | CHECK_SYMBOL (symbol); | |
db633ecc | 430 | SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (symbol), 0); |
513749ee SM |
431 | return Qnil; |
432 | } | |
433 | ||
db9f0278 | 434 | \f |
db9f0278 | 435 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, |
9dbc9081 PJ |
436 | doc: /* Return result of expanding macros at top level of FORM. |
437 | If FORM is not a macro call, it is returned unchanged. | |
438 | Otherwise, the macro is expanded and the expansion is considered | |
439 | in place of FORM. When a non-macro-call results, it is returned. | |
440 | ||
441 | The second optional arg ENVIRONMENT specifies an environment of macro | |
442 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 443 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 444 | { |
23d6b5a6 | 445 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
446 | register Lisp_Object expander, sym, def, tem; |
447 | ||
448 | while (1) | |
449 | { | |
450 | /* Come back here each time we expand a macro call, | |
451 | in case it expands into another macro call. */ | |
90165123 | 452 | if (!CONSP (form)) |
db9f0278 | 453 | break; |
23d6b5a6 | 454 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 455 | def = sym = XCAR (form); |
23d6b5a6 | 456 | tem = Qnil; |
db9f0278 JB |
457 | /* Trace symbols aliases to other symbols |
458 | until we get a symbol that is not an alias. */ | |
90165123 | 459 | while (SYMBOLP (def)) |
db9f0278 JB |
460 | { |
461 | QUIT; | |
23d6b5a6 | 462 | sym = def; |
79e8bfbf | 463 | tem = Fassq (sym, environment); |
265a9e55 | 464 | if (NILP (tem)) |
db9f0278 | 465 | { |
d8ccbf1a | 466 | def = SYMBOL_FUNCTION (sym); |
eadf1faa | 467 | if (!NILP (def)) |
23d6b5a6 | 468 | continue; |
db9f0278 | 469 | } |
23d6b5a6 | 470 | break; |
db9f0278 | 471 | } |
79e8bfbf | 472 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 473 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 474 | if (NILP (tem)) |
db9f0278 | 475 | { |
79e8bfbf | 476 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 477 | Look at its function definition. */ |
7abaf5cc SM |
478 | struct gcpro gcpro1; |
479 | GCPRO1 (form); | |
480 | def = Fautoload_do_load (def, sym, Qmacro); | |
481 | UNGCPRO; | |
eadf1faa | 482 | if (!CONSP (def)) |
f6d62986 | 483 | /* Not defined or definition not suitable. */ |
db9f0278 | 484 | break; |
7abaf5cc | 485 | if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 486 | break; |
03699b14 | 487 | else expander = XCDR (def); |
db9f0278 JB |
488 | } |
489 | else | |
490 | { | |
03699b14 | 491 | expander = XCDR (tem); |
265a9e55 | 492 | if (NILP (expander)) |
db9f0278 JB |
493 | break; |
494 | } | |
4f18a4ed SM |
495 | { |
496 | Lisp_Object newform = apply1 (expander, XCDR (form)); | |
497 | if (EQ (form, newform)) | |
498 | break; | |
499 | else | |
500 | form = newform; | |
501 | } | |
db9f0278 JB |
502 | } |
503 | return form; | |
504 | } | |
505 | \f | |
1bf3ed7c | 506 | DEFUN ("call-with-catch", Fcatch, Scatch, 2, 2, 0, |
9dbc9081 PJ |
507 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
508 | TAG is evalled to get the tag to use; it must not be nil. | |
509 | ||
510 | Then the BODY is executed. | |
1d632ccf | 511 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
512 | If no throw happens, `catch' returns the value of the last BODY form. |
513 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 514 | usage: (catch TAG BODY...) */) |
1bf3ed7c | 515 | (Lisp_Object tag, Lisp_Object thunk) |
db9f0278 | 516 | { |
1bf3ed7c | 517 | return internal_catch (tag, call0, thunk); |
db9f0278 JB |
518 | } |
519 | ||
b52f569d PE |
520 | /* Assert that E is true, as a comment only. Use this instead of |
521 | eassert (E) when E contains variables that might be clobbered by a | |
522 | longjmp. */ | |
523 | ||
524 | #define clobbered_eassert(E) ((void) 0) | |
525 | ||
316bec86 BT |
526 | static void |
527 | set_handlerlist (void *data) | |
528 | { | |
529 | handlerlist = data; | |
530 | } | |
531 | ||
532 | static void | |
533 | restore_handler (void *data) | |
534 | { | |
535 | struct handler *c = data; | |
316bec86 BT |
536 | unblock_input_to (c->interrupt_input_blocked); |
537 | immediate_quit = 0; | |
538 | } | |
539 | ||
540 | struct icc_thunk_env | |
541 | { | |
542 | enum { ICC_0, ICC_1, ICC_2, ICC_3, ICC_N } type; | |
543 | union | |
544 | { | |
545 | Lisp_Object (*fun0) (void); | |
546 | Lisp_Object (*fun1) (Lisp_Object); | |
547 | Lisp_Object (*fun2) (Lisp_Object, Lisp_Object); | |
548 | Lisp_Object (*fun3) (Lisp_Object, Lisp_Object, Lisp_Object); | |
549 | Lisp_Object (*funn) (ptrdiff_t, Lisp_Object *); | |
550 | }; | |
551 | union | |
552 | { | |
553 | struct | |
554 | { | |
555 | Lisp_Object arg1; | |
556 | Lisp_Object arg2; | |
557 | Lisp_Object arg3; | |
558 | }; | |
559 | struct | |
560 | { | |
561 | ptrdiff_t nargs; | |
562 | Lisp_Object *args; | |
563 | }; | |
564 | }; | |
565 | struct handler *c; | |
566 | }; | |
567 | ||
568 | static Lisp_Object | |
569 | icc_thunk (void *data) | |
570 | { | |
571 | Lisp_Object tem; | |
572 | struct icc_thunk_env *e = data; | |
573 | scm_dynwind_begin (0); | |
574 | scm_dynwind_unwind_handler (restore_handler, e->c, 0); | |
575 | scm_dynwind_unwind_handler (set_handlerlist, | |
576 | handlerlist, | |
577 | SCM_F_WIND_EXPLICITLY); | |
578 | handlerlist = e->c; | |
579 | switch (e->type) | |
580 | { | |
581 | case ICC_0: | |
582 | tem = e->fun0 (); | |
583 | break; | |
584 | case ICC_1: | |
585 | tem = e->fun1 (e->arg1); | |
586 | break; | |
587 | case ICC_2: | |
588 | tem = e->fun2 (e->arg1, e->arg2); | |
589 | break; | |
590 | case ICC_3: | |
591 | tem = e->fun3 (e->arg1, e->arg2, e->arg3); | |
592 | break; | |
593 | case ICC_N: | |
594 | tem = e->funn (e->nargs, e->args); | |
595 | break; | |
596 | default: | |
597 | emacs_abort (); | |
598 | } | |
599 | scm_dynwind_end (); | |
600 | return tem; | |
601 | } | |
602 | ||
603 | static Lisp_Object | |
604 | icc_handler (void *data, Lisp_Object k, Lisp_Object v) | |
605 | { | |
606 | Lisp_Object (*f) (Lisp_Object) = data; | |
607 | return f (v); | |
608 | } | |
609 | ||
610 | struct icc_handler_n_env | |
611 | { | |
612 | Lisp_Object (*fun) (Lisp_Object, ptrdiff_t, Lisp_Object *); | |
613 | ptrdiff_t nargs; | |
614 | Lisp_Object *args; | |
615 | }; | |
616 | ||
617 | static Lisp_Object | |
618 | icc_handler_n (void *data, Lisp_Object k, Lisp_Object v) | |
619 | { | |
620 | struct icc_handler_n_env *e = data; | |
621 | return e->fun (v, e->nargs, e->args); | |
622 | } | |
623 | ||
624 | static Lisp_Object | |
625 | icc_lisp_handler (void *data, Lisp_Object k, Lisp_Object val) | |
626 | { | |
627 | Lisp_Object tem; | |
628 | struct handler *h = data; | |
629 | Lisp_Object var = h->var; | |
630 | scm_dynwind_begin (0); | |
631 | if (!NILP (var)) | |
632 | { | |
34c1b9bb | 633 | #if 0 |
316bec86 BT |
634 | if (!NILP (Vinternal_interpreter_environment)) |
635 | specbind (Qinternal_interpreter_environment, | |
636 | Fcons (Fcons (var, val), | |
637 | Vinternal_interpreter_environment)); | |
638 | else | |
34c1b9bb | 639 | #endif |
316bec86 BT |
640 | specbind (var, val); |
641 | } | |
642 | tem = Fprogn (h->body); | |
643 | scm_dynwind_end (); | |
644 | return tem; | |
645 | } | |
646 | ||
db9f0278 JB |
647 | /* Set up a catch, then call C function FUNC on argument ARG. |
648 | FUNC should return a Lisp_Object. | |
2f592f95 | 649 | This is how catches are done from within C code. */ |
db9f0278 JB |
650 | |
651 | Lisp_Object | |
d3da34e0 | 652 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 653 | { |
316bec86 BT |
654 | struct handler *c = make_catch_handler (tag); |
655 | struct icc_thunk_env env = { .type = ICC_1, | |
656 | .fun1 = func, | |
657 | .arg1 = arg, | |
658 | .c = c }; | |
659 | return call_with_prompt (c->ptag, | |
660 | make_c_closure (icc_thunk, &env, 0, 0), | |
661 | make_c_closure (icc_handler, Fidentity, 2, 0)); | |
db9f0278 JB |
662 | } |
663 | ||
ba410f40 JB |
664 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
665 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 666 | |
4d7e6e51 | 667 | This is the guts of Fthrow and Fsignal; they differ only in the way |
ba410f40 JB |
668 | they choose the catch tag to throw to. A catch tag for a |
669 | condition-case form has a TAG of Qnil. | |
db9f0278 | 670 | |
ba410f40 JB |
671 | Before each catch is discarded, unbind all special bindings and |
672 | execute all unwind-protect clauses made above that catch. Unwind | |
673 | the handler stack as we go, so that the proper handlers are in | |
674 | effect for each unwind-protect clause we run. At the end, restore | |
675 | some static info saved in CATCH, and longjmp to the location | |
4d7e6e51 | 676 | specified there. |
ba410f40 JB |
677 | |
678 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 | 679 | |
e1ad689c BT |
680 | static Lisp_Object unbind_to_1 (ptrdiff_t, Lisp_Object, bool); |
681 | ||
845ca893 | 682 | static _Noreturn void |
adf2aa61 | 683 | unwind_to_catch (struct handler *catch, Lisp_Object value) |
db9f0278 | 684 | { |
316bec86 | 685 | abort_to_prompt (catch->ptag, scm_list_1 (value)); |
db9f0278 JB |
686 | } |
687 | ||
a7ca3326 | 688 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, |
9dbc9081 PJ |
689 | doc: /* Throw to the catch for TAG and return VALUE from it. |
690 | Both TAG and VALUE are evalled. */) | |
5842a27b | 691 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 | 692 | { |
adf2aa61 | 693 | struct handler *c; |
db9f0278 | 694 | |
8788120f | 695 | if (!NILP (tag)) |
adf2aa61 | 696 | for (c = handlerlist; c; c = c->next) |
8788120f | 697 | { |
adf2aa61 | 698 | if (c->type == CATCHER && EQ (c->tag_or_ch, tag)) |
8788120f KS |
699 | unwind_to_catch (c, value); |
700 | } | |
734d55a2 | 701 | xsignal2 (Qno_catch, tag, value); |
db9f0278 | 702 | } |
db9f0278 | 703 | \f |
1bf3ed7c | 704 | DEFUN ("call-with-handler", Fcall_with_handler, Scall_with_handler, 4, 4, 0, |
9dbc9081 | 705 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 706 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
707 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
708 | where the BODY is made of Lisp expressions. | |
709 | ||
710 | A handler is applicable to an error | |
711 | if CONDITION-NAME is one of the error's condition names. | |
712 | If an error happens, the first applicable handler is run. | |
713 | ||
024a2d76 CY |
714 | The car of a handler may be a list of condition names instead of a |
715 | single condition name; then it handles all of them. If the special | |
716 | condition name `debug' is present in this list, it allows another | |
717 | condition in the list to run the debugger if `debug-on-error' and the | |
718 | other usual mechanisms says it should (otherwise, `condition-case' | |
719 | suppresses the debugger). | |
9dbc9081 | 720 | |
c997bb25 RS |
721 | When a handler handles an error, control returns to the `condition-case' |
722 | and it executes the handler's BODY... | |
d0acbbaf | 723 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 724 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
725 | Then the value of the last BODY form is returned from the `condition-case' |
726 | expression. | |
9dbc9081 | 727 | |
9dbc9081 | 728 | See also the function `signal' for more info. |
2b47b74d | 729 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
1bf3ed7c RT |
730 | (Lisp_Object var, |
731 | Lisp_Object conditions, | |
732 | Lisp_Object hthunk, | |
733 | Lisp_Object thunk) | |
db9f0278 | 734 | { |
1bf3ed7c RT |
735 | return internal_lisp_condition_case (var, |
736 | list2 (intern ("funcall"), thunk), | |
737 | list1 (list2 (conditions, list2 (intern ("funcall"), hthunk)))); | |
ee830945 RS |
738 | } |
739 | ||
316bec86 BT |
740 | static Lisp_Object |
741 | ilcc1 (Lisp_Object var, Lisp_Object bodyform, Lisp_Object handlers) | |
742 | { | |
743 | if (CONSP (handlers)) | |
744 | { | |
745 | Lisp_Object clause = XCAR (handlers); | |
746 | Lisp_Object condition = XCAR (clause); | |
747 | Lisp_Object body = XCDR (clause); | |
748 | if (!CONSP (condition)) | |
749 | condition = Fcons (condition, Qnil); | |
750 | struct handler *c = make_condition_handler (condition); | |
751 | c->var = var; | |
752 | c->body = body; | |
753 | struct icc_thunk_env env = { .type = ICC_3, | |
754 | .fun3 = ilcc1, | |
755 | .arg1 = var, | |
756 | .arg2 = bodyform, | |
757 | .arg3 = XCDR (handlers), | |
758 | .c = c }; | |
759 | return call_with_prompt (c->ptag, | |
760 | make_c_closure (icc_thunk, &env, 0, 0), | |
761 | make_c_closure (icc_lisp_handler, c, 2, 0)); | |
762 | } | |
763 | else | |
764 | { | |
765 | return eval_sub (bodyform); | |
766 | } | |
767 | } | |
768 | ||
ee830945 RS |
769 | /* Like Fcondition_case, but the args are separate |
770 | rather than passed in a list. Used by Fbyte_code. */ | |
771 | ||
772 | Lisp_Object | |
d3da34e0 JB |
773 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
774 | Lisp_Object handlers) | |
ee830945 RS |
775 | { |
776 | Lisp_Object val; | |
adf2aa61 SM |
777 | struct handler *c; |
778 | struct handler *oldhandlerlist = handlerlist; | |
ee830945 | 779 | |
b7826503 | 780 | CHECK_SYMBOL (var); |
82da7701 | 781 | |
2b47b74d | 782 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 | 783 | { |
adf2aa61 | 784 | Lisp_Object tem = XCAR (val); |
5f96776a RS |
785 | if (! (NILP (tem) |
786 | || (CONSP (tem) | |
03699b14 KR |
787 | && (SYMBOLP (XCAR (tem)) |
788 | || CONSP (XCAR (tem)))))) | |
e6c3da20 EZ |
789 | error ("Invalid condition handler: %s", |
790 | SDATA (Fprin1_to_string (tem, Qt))); | |
82da7701 | 791 | } |
db9f0278 | 792 | |
316bec86 | 793 | return ilcc1 (var, bodyform, Freverse (handlers)); |
db9f0278 JB |
794 | } |
795 | ||
f029ca5f RS |
796 | /* Call the function BFUN with no arguments, catching errors within it |
797 | according to HANDLERS. If there is an error, call HFUN with | |
798 | one argument which is the data that describes the error: | |
799 | (SIGNALNAME . DATA) | |
800 | ||
801 | HANDLERS can be a list of conditions to catch. | |
802 | If HANDLERS is Qt, catch all errors. | |
803 | If HANDLERS is Qerror, catch all errors | |
804 | but allow the debugger to run if that is enabled. */ | |
805 | ||
db9f0278 | 806 | Lisp_Object |
d3da34e0 JB |
807 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
808 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
809 | { |
810 | Lisp_Object val; | |
316bec86 | 811 | struct handler *c = make_condition_handler (handlers); |
adf2aa61 | 812 | |
316bec86 BT |
813 | struct icc_thunk_env env = { .type = ICC_0, .fun0 = bfun, .c = c }; |
814 | return call_with_prompt (c->ptag, | |
815 | make_c_closure (icc_thunk, &env, 0, 0), | |
816 | make_c_closure (icc_handler, hfun, 2, 0)); | |
db9f0278 JB |
817 | } |
818 | ||
2659a09f | 819 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 820 | |
d227775c | 821 | Lisp_Object |
d3da34e0 JB |
822 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
823 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
824 | { |
825 | Lisp_Object val; | |
316bec86 | 826 | struct handler *c = make_condition_handler (handlers); |
adf2aa61 | 827 | |
316bec86 BT |
828 | struct icc_thunk_env env = { .type = ICC_1, |
829 | .fun1 = bfun, | |
830 | .arg1 = arg, | |
831 | .c = c }; | |
832 | return call_with_prompt (c->ptag, | |
833 | make_c_closure (icc_thunk, &env, 0, 0), | |
834 | make_c_closure (icc_handler, hfun, 2, 0)); | |
d227775c | 835 | } |
10b29d41 | 836 | |
53967e09 CY |
837 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
838 | its arguments. */ | |
839 | ||
840 | Lisp_Object | |
178f2507 SM |
841 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
842 | Lisp_Object arg1, | |
843 | Lisp_Object arg2, | |
844 | Lisp_Object handlers, | |
845 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
846 | { |
847 | Lisp_Object val; | |
316bec86 BT |
848 | struct handler *c = make_condition_handler (handlers); |
849 | struct icc_thunk_env env = { .type = ICC_2, | |
850 | .fun2 = bfun, | |
851 | .arg1 = arg1, | |
852 | .arg2 = arg2, | |
853 | .c = c }; | |
854 | return call_with_prompt (c->ptag, | |
855 | make_c_closure (icc_thunk, &env, 0, 0), | |
856 | make_c_closure (icc_handler, hfun, 2, 0)); | |
53967e09 | 857 | } |
10b29d41 | 858 | |
2659a09f | 859 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
860 | and ARGS as second argument. */ |
861 | ||
862 | Lisp_Object | |
f66c7cf8 PE |
863 | internal_condition_case_n (Lisp_Object (*bfun) (ptrdiff_t, Lisp_Object *), |
864 | ptrdiff_t nargs, | |
178f2507 SM |
865 | Lisp_Object *args, |
866 | Lisp_Object handlers, | |
cc92c454 SM |
867 | Lisp_Object (*hfun) (Lisp_Object err, |
868 | ptrdiff_t nargs, | |
869 | Lisp_Object *args)) | |
10b29d41 GM |
870 | { |
871 | Lisp_Object val; | |
316bec86 | 872 | struct handler *c = make_condition_handler (handlers); |
adf2aa61 | 873 | |
316bec86 BT |
874 | struct icc_thunk_env env = { .type = ICC_N, |
875 | .funn = bfun, | |
876 | .nargs = nargs, | |
877 | .args = args, | |
878 | .c = c }; | |
879 | struct icc_handler_n_env henv = { .fun = hfun, .nargs = nargs, .args = args }; | |
880 | return call_with_prompt (c->ptag, | |
881 | make_c_closure (icc_thunk, &env, 0, 0), | |
882 | make_c_closure (icc_handler_n, &henv, 2, 0)); | |
10b29d41 GM |
883 | } |
884 | ||
d227775c | 885 | \f |
7d47b580 | 886 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object); |
1882aa38 PE |
887 | static bool maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
888 | Lisp_Object data); | |
db9f0278 | 889 | |
6d5eb5b0 SM |
890 | void |
891 | process_quit_flag (void) | |
892 | { | |
893 | Lisp_Object flag = Vquit_flag; | |
894 | Vquit_flag = Qnil; | |
895 | if (EQ (flag, Qkill_emacs)) | |
896 | Fkill_emacs (Qnil); | |
897 | if (EQ (Vthrow_on_input, flag)) | |
898 | Fthrow (Vthrow_on_input, Qt); | |
899 | Fsignal (Qquit, Qnil); | |
900 | } | |
901 | ||
a7ca3326 | 902 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, |
9dbc9081 PJ |
903 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
904 | This function does not return. | |
905 | ||
906 | An error symbol is a symbol with an `error-conditions' property | |
907 | that is a list of condition names. | |
908 | A handler for any of those names will get to handle this signal. | |
909 | The symbol `error' should normally be one of them. | |
910 | ||
911 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
912 | See Info anchor `(elisp)Definition of signal' for some details on how this |
913 | error message is constructed. | |
9dbc9081 PJ |
914 | If the signal is handled, DATA is made available to the handler. |
915 | See also the function `condition-case'. */) | |
5842a27b | 916 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 917 | { |
bfa8ca43 | 918 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
919 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
920 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 921 | Lisp_Object conditions; |
c11d3d17 | 922 | Lisp_Object string; |
e7f7fbaa SM |
923 | Lisp_Object real_error_symbol |
924 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
925 | register Lisp_Object clause = Qnil; | |
926 | struct handler *h; | |
db9f0278 | 927 | |
0caaedb1 | 928 | immediate_quit = 0; |
d90fb7af | 929 | if (waiting_for_input) |
1088b922 | 930 | emacs_abort (); |
db9f0278 | 931 | |
26631f2b RS |
932 | #if 0 /* rms: I don't know why this was here, |
933 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 934 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
935 | if (display_hourglass_p) |
936 | cancel_hourglass (); | |
48f8dfa3 | 937 | #endif |
177c0ea7 | 938 | #endif |
48f8dfa3 | 939 | |
61ede770 | 940 | /* This hook is used by edebug. */ |
26631f2b RS |
941 | if (! NILP (Vsignal_hook_function) |
942 | && ! NILP (error_symbol)) | |
9f5903bb RS |
943 | { |
944 | /* Edebug takes care of restoring these variables when it exits. */ | |
945 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
946 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
947 | ||
948 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
949 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
950 | ||
951 | call2 (Vsignal_hook_function, error_symbol, data); | |
952 | } | |
61ede770 | 953 | |
1ea9dec4 | 954 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 955 | |
e7f7fbaa | 956 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 957 | { |
adf2aa61 SM |
958 | if (h->type != CONDITION_CASE) |
959 | continue; | |
960 | clause = find_handler_clause (h->tag_or_ch, conditions); | |
265a9e55 | 961 | if (!NILP (clause)) |
e7f7fbaa | 962 | break; |
db9f0278 | 963 | } |
475545b5 | 964 | |
e7f7fbaa | 965 | if (/* Don't run the debugger for a memory-full error. |
e7c1b6ef | 966 | (There is no room in memory to do that!) */ |
e7f7fbaa SM |
967 | !NILP (error_symbol) |
968 | && (!NILP (Vdebug_on_signal) | |
969 | /* If no handler is present now, try to run the debugger. */ | |
970 | || NILP (clause) | |
bd1ba3e8 CY |
971 | /* A `debug' symbol in the handler list disables the normal |
972 | suppression of the debugger. */ | |
afd4479f SM |
973 | || (CONSP (clause) && CONSP (clause) |
974 | && !NILP (Fmemq (Qdebug, clause))) | |
e7f7fbaa SM |
975 | /* Special handler that means "print a message and run debugger |
976 | if requested". */ | |
adf2aa61 | 977 | || EQ (h->tag_or_ch, Qerror))) |
e7f7fbaa | 978 | { |
1882aa38 | 979 | bool debugger_called |
e7f7fbaa SM |
980 | = maybe_call_debugger (conditions, error_symbol, data); |
981 | /* We can't return values to code which signaled an error, but we | |
982 | can continue code which has signaled a quit. */ | |
983 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
984 | return Qnil; | |
475545b5 | 985 | } |
db9f0278 | 986 | |
e7f7fbaa SM |
987 | if (!NILP (clause)) |
988 | { | |
989 | Lisp_Object unwind_data | |
990 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 991 | |
adf2aa61 | 992 | unwind_to_catch (h, unwind_data); |
e7f7fbaa SM |
993 | } |
994 | else | |
995 | { | |
316bec86 | 996 | if (handlerlist != handlerlist_sentinel) |
70de5e86 SM |
997 | /* FIXME: This will come right back here if there's no `top-level' |
998 | catcher. A better solution would be to abort here, and instead | |
999 | add a catch-all condition handler so we never come here. */ | |
e7f7fbaa SM |
1000 | Fthrow (Qtop_level, Qt); |
1001 | } | |
c11d3d17 | 1002 | |
1ea9dec4 | 1003 | if (! NILP (error_symbol)) |
c11d3d17 | 1004 | data = Fcons (error_symbol, data); |
475545b5 | 1005 | |
c11d3d17 | 1006 | string = Ferror_message_string (data); |
583f48b9 | 1007 | fatal ("%s", SDATA (string)); |
db9f0278 JB |
1008 | } |
1009 | ||
734d55a2 KS |
1010 | /* Internal version of Fsignal that never returns. |
1011 | Used for anything but Qquit (which can return from Fsignal). */ | |
1012 | ||
1013 | void | |
d3da34e0 | 1014 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1015 | { |
1016 | Fsignal (error_symbol, data); | |
1088b922 | 1017 | emacs_abort (); |
734d55a2 KS |
1018 | } |
1019 | ||
1020 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1021 | ||
1022 | void | |
d3da34e0 | 1023 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1024 | { |
1025 | xsignal (error_symbol, Qnil); | |
1026 | } | |
1027 | ||
1028 | void | |
d3da34e0 | 1029 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1030 | { |
1031 | xsignal (error_symbol, list1 (arg)); | |
1032 | } | |
1033 | ||
1034 | void | |
d3da34e0 | 1035 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1036 | { |
1037 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1038 | } | |
1039 | ||
1040 | void | |
d3da34e0 | 1041 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1042 | { |
1043 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1044 | } | |
1045 | ||
1046 | /* Signal `error' with message S, and additional arg ARG. | |
1047 | If ARG is not a genuine list, make it a one-element list. */ | |
1048 | ||
1049 | void | |
a8fe7202 | 1050 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1051 | { |
1052 | Lisp_Object tortoise, hare; | |
1053 | ||
1054 | hare = tortoise = arg; | |
1055 | while (CONSP (hare)) | |
1056 | { | |
1057 | hare = XCDR (hare); | |
1058 | if (!CONSP (hare)) | |
1059 | break; | |
1060 | ||
1061 | hare = XCDR (hare); | |
1062 | tortoise = XCDR (tortoise); | |
1063 | ||
1064 | if (EQ (hare, tortoise)) | |
1065 | break; | |
1066 | } | |
1067 | ||
1068 | if (!NILP (hare)) | |
6c6f1994 | 1069 | arg = list1 (arg); |
734d55a2 KS |
1070 | |
1071 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1072 | } | |
1073 | ||
1074 | ||
1882aa38 | 1075 | /* Return true if LIST is a non-nil atom or |
128c0f66 RM |
1076 | a list containing one of CONDITIONS. */ |
1077 | ||
1882aa38 | 1078 | static bool |
d3da34e0 | 1079 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1080 | { |
4de86b16 | 1081 | if (NILP (list)) |
128c0f66 RM |
1082 | return 0; |
1083 | if (! CONSP (list)) | |
1084 | return 1; | |
1085 | ||
ab67260b | 1086 | while (CONSP (conditions)) |
128c0f66 | 1087 | { |
ab67260b | 1088 | Lisp_Object this, tail; |
03699b14 KR |
1089 | this = XCAR (conditions); |
1090 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1091 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1092 | return 1; |
03699b14 | 1093 | conditions = XCDR (conditions); |
128c0f66 | 1094 | } |
ab67260b | 1095 | return 0; |
128c0f66 RM |
1096 | } |
1097 | ||
1882aa38 | 1098 | /* Return true if an error with condition-symbols CONDITIONS, |
fc950e09 | 1099 | and described by SIGNAL-DATA, should skip the debugger |
1b1acc13 | 1100 | according to debugger-ignored-errors. */ |
fc950e09 | 1101 | |
1882aa38 | 1102 | static bool |
d3da34e0 | 1103 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1104 | { |
1105 | Lisp_Object tail; | |
1882aa38 | 1106 | bool first_string = 1; |
fc950e09 KH |
1107 | Lisp_Object error_message; |
1108 | ||
17401c97 GM |
1109 | error_message = Qnil; |
1110 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1111 | { |
03699b14 | 1112 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1113 | { |
1114 | if (first_string) | |
1115 | { | |
1116 | error_message = Ferror_message_string (data); | |
1117 | first_string = 0; | |
1118 | } | |
177c0ea7 | 1119 | |
03699b14 | 1120 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1121 | return 1; |
1122 | } | |
1123 | else | |
1124 | { | |
1125 | Lisp_Object contail; | |
1126 | ||
17401c97 | 1127 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1128 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1129 | return 1; |
1130 | } | |
1131 | } | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1135 | ||
ddaa36e1 | 1136 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
7d47b580 JB |
1137 | SIG and DATA describe the signal. There are two ways to pass them: |
1138 | = SIG is the error symbol, and DATA is the rest of the data. | |
1139 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). | |
1140 | This is for memory-full errors only. */ | |
1882aa38 | 1141 | static bool |
d3da34e0 | 1142 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1143 | { |
1144 | Lisp_Object combined_data; | |
1145 | ||
1146 | combined_data = Fcons (sig, data); | |
1147 | ||
1148 | if ( | |
1149 | /* Don't try to run the debugger with interrupts blocked. | |
1150 | The editing loop would return anyway. */ | |
4d7e6e51 | 1151 | ! input_blocked_p () |
45b82ad0 | 1152 | && NILP (Vinhibit_debugger) |
ddaa36e1 AS |
1153 | /* Does user want to enter debugger for this kind of error? */ |
1154 | && (EQ (sig, Qquit) | |
1155 | ? debug_on_quit | |
1156 | : wants_debugger (Vdebug_on_error, conditions)) | |
1157 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1158 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1159 | && when_entered_debugger < num_nonmacro_input_events) |
1160 | { | |
6c6f1994 | 1161 | call_debugger (list2 (Qerror, combined_data)); |
ddaa36e1 AS |
1162 | return 1; |
1163 | } | |
1164 | ||
1165 | return 0; | |
1166 | } | |
1167 | ||
db9f0278 | 1168 | static Lisp_Object |
7d47b580 | 1169 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions) |
db9f0278 JB |
1170 | { |
1171 | register Lisp_Object h; | |
db9f0278 | 1172 | |
f01cbfdd RS |
1173 | /* t is used by handlers for all conditions, set up by C code. */ |
1174 | if (EQ (handlers, Qt)) | |
db9f0278 | 1175 | return Qt; |
f01cbfdd | 1176 | |
61ede770 RS |
1177 | /* error is used similarly, but means print an error message |
1178 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1179 | if (EQ (handlers, Qerror)) |
1180 | return Qt; | |
f01cbfdd | 1181 | |
e7f7fbaa | 1182 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1183 | { |
e7f7fbaa | 1184 | Lisp_Object handler = XCAR (h); |
adf2aa61 SM |
1185 | if (!NILP (Fmemq (handler, conditions))) |
1186 | return handlers; | |
db9f0278 | 1187 | } |
f01cbfdd | 1188 | |
db9f0278 JB |
1189 | return Qnil; |
1190 | } | |
1191 | ||
db9f0278 | 1192 | |
f6d62986 | 1193 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1194 | void |
b3ffc17c | 1195 | verror (const char *m, va_list ap) |
db9f0278 | 1196 | { |
70476b54 | 1197 | char buf[4000]; |
c2d1e36d PE |
1198 | ptrdiff_t size = sizeof buf; |
1199 | ptrdiff_t size_max = STRING_BYTES_BOUND + 1; | |
9125da08 | 1200 | char *buffer = buf; |
c2d1e36d | 1201 | ptrdiff_t used; |
9125da08 RS |
1202 | Lisp_Object string; |
1203 | ||
d749b01b | 1204 | used = evxprintf (&buffer, &size, buf, size_max, m, ap); |
5fdb398c | 1205 | string = make_string (buffer, used); |
eb3f1cc8 | 1206 | if (buffer != buf) |
9ae6734f | 1207 | xfree (buffer); |
9125da08 | 1208 | |
734d55a2 | 1209 | xsignal1 (Qerror, string); |
db9f0278 | 1210 | } |
b3ffc17c DN |
1211 | |
1212 | ||
f6d62986 | 1213 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
1214 | |
1215 | /* VARARGS 1 */ | |
1216 | void | |
1217 | error (const char *m, ...) | |
1218 | { | |
1219 | va_list ap; | |
1220 | va_start (ap, m); | |
1221 | verror (m, ap); | |
b3ffc17c | 1222 | } |
db9f0278 | 1223 | \f |
a7ca3326 | 1224 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
1225 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
1226 | This means it contains a description for how to read arguments to give it. | |
1227 | The value is nil for an invalid function or a symbol with no function | |
1228 | definition. | |
1229 | ||
1230 | Interactively callable functions include strings and vectors (treated | |
1231 | as keyboard macros), lambda-expressions that contain a top-level call | |
1232 | to `interactive', autoload definitions made by `autoload' with non-nil | |
1233 | fourth argument, and some of the built-in functions of Lisp. | |
1234 | ||
e72706be RS |
1235 | Also, a symbol satisfies `commandp' if its function definition does so. |
1236 | ||
1237 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 1238 | then strings and vectors are not accepted. */) |
5842a27b | 1239 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
1240 | { |
1241 | register Lisp_Object fun; | |
1242 | register Lisp_Object funcar; | |
52b71f49 | 1243 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
1244 | |
1245 | fun = function; | |
1246 | ||
eadf1faa SM |
1247 | fun = indirect_function (fun); /* Check cycles. */ |
1248 | if (NILP (fun)) | |
ffd56f97 | 1249 | return Qnil; |
db9f0278 | 1250 | |
52b71f49 | 1251 | /* Check an `interactive-form' property if present, analogous to the |
eadf1faa | 1252 | function-documentation property. */ |
52b71f49 SM |
1253 | fun = function; |
1254 | while (SYMBOLP (fun)) | |
1255 | { | |
2b9aa051 | 1256 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
1257 | if (!NILP (tmp)) |
1258 | if_prop = Qt; | |
1259 | fun = Fsymbol_function (fun); | |
1260 | } | |
1261 | ||
b7faa6e4 | 1262 | if (scm_is_true (scm_procedure_p (fun))) |
7aad910c BT |
1263 | return (scm_is_pair (scm_assq (Qinteractive_form, |
1264 | scm_procedure_properties (fun))) | |
b7faa6e4 | 1265 | ? Qt : if_prop); |
db9f0278 JB |
1266 | /* Bytecode objects are interactive if they are long enough to |
1267 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1268 | where the interactive spec is stored. */ | |
90165123 | 1269 | else if (COMPILEDP (fun)) |
845975f5 | 1270 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 1271 | ? Qt : if_prop); |
db9f0278 JB |
1272 | |
1273 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 1274 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 1275 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
1276 | |
1277 | /* Lists may represent commands. */ | |
1278 | if (!CONSP (fun)) | |
1279 | return Qnil; | |
ed16fb98 | 1280 | funcar = XCAR (fun); |
b38b1ec0 | 1281 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
1282 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
1283 | ? Qt : if_prop); | |
23aba0ea | 1284 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 1285 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 1286 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 1287 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
1288 | else |
1289 | return Qnil; | |
1290 | } | |
1291 | ||
db9f0278 | 1292 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
1293 | doc: /* Define FUNCTION to autoload from FILE. |
1294 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
1295 | Third arg DOCSTRING is documentation for the function. | |
1296 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
1297 | Fifth arg TYPE indicates the type of the object: | |
1298 | nil or omitted says FUNCTION is a function, | |
1299 | `keymap' says FUNCTION is really a keymap, and | |
1300 | `macro' or t says FUNCTION is really a macro. | |
1301 | Third through fifth args give info about the real definition. | |
1302 | They default to nil. | |
1303 | If FUNCTION is already defined other than as an autoload, | |
1304 | this does nothing and returns nil. */) | |
5842a27b | 1305 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 1306 | { |
b7826503 PJ |
1307 | CHECK_SYMBOL (function); |
1308 | CHECK_STRING (file); | |
db9f0278 | 1309 | |
f6d62986 | 1310 | /* If function is defined and not as an autoload, don't override. */ |
d8ccbf1a BT |
1311 | if (!NILP (SYMBOL_FUNCTION (function)) |
1312 | && !AUTOLOADP (SYMBOL_FUNCTION (function))) | |
db9f0278 JB |
1313 | return Qnil; |
1314 | ||
32e5c58c SM |
1315 | return Fdefalias (function, |
1316 | list5 (Qautoload, file, docstring, interactive, type), | |
1317 | Qnil); | |
db9f0278 JB |
1318 | } |
1319 | ||
27e498e6 | 1320 | void |
d3da34e0 | 1321 | un_autoload (Lisp_Object oldqueue) |
db9f0278 | 1322 | { |
27e498e6 | 1323 | Lisp_Object queue, first, second; |
db9f0278 JB |
1324 | |
1325 | /* Queue to unwind is current value of Vautoload_queue. | |
1326 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1327 | queue = Vautoload_queue; | |
1328 | Vautoload_queue = oldqueue; | |
1329 | while (CONSP (queue)) | |
1330 | { | |
e509f168 | 1331 | first = XCAR (queue); |
db9f0278 JB |
1332 | second = Fcdr (first); |
1333 | first = Fcar (first); | |
47b82df9 RS |
1334 | if (EQ (first, make_number (0))) |
1335 | Vfeatures = second; | |
db9f0278 JB |
1336 | else |
1337 | Ffset (first, second); | |
e509f168 | 1338 | queue = XCDR (queue); |
db9f0278 | 1339 | } |
db9f0278 JB |
1340 | } |
1341 | ||
ca20916b RS |
1342 | /* Load an autoloaded function. |
1343 | FUNNAME is the symbol which is the function's name. | |
1344 | FUNDEF is the autoload definition (a list). */ | |
1345 | ||
7abaf5cc SM |
1346 | DEFUN ("autoload-do-load", Fautoload_do_load, Sautoload_do_load, 1, 3, 0, |
1347 | doc: /* Load FUNDEF which should be an autoload. | |
1348 | If non-nil, FUNNAME should be the symbol whose function value is FUNDEF, | |
1349 | in which case the function returns the new autoloaded function value. | |
1350 | If equal to `macro', MACRO-ONLY specifies that FUNDEF should only be loaded if | |
1351 | it is defines a macro. */) | |
1352 | (Lisp_Object fundef, Lisp_Object funname, Lisp_Object macro_only) | |
db9f0278 | 1353 | { |
3200038e | 1354 | dynwind_begin (); |
ca20916b | 1355 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 1356 | |
3200038e BT |
1357 | if (!CONSP (fundef) || !EQ (Qautoload, XCAR (fundef))) { |
1358 | dynwind_end (); | |
7abaf5cc | 1359 | return fundef; |
3200038e | 1360 | } |
7abaf5cc SM |
1361 | |
1362 | if (EQ (macro_only, Qmacro)) | |
1363 | { | |
1364 | Lisp_Object kind = Fnth (make_number (4), fundef); | |
3200038e BT |
1365 | if (! (EQ (kind, Qt) || EQ (kind, Qmacro))) { |
1366 | dynwind_end (); | |
1367 | return fundef; | |
1368 | } | |
7abaf5cc SM |
1369 | } |
1370 | ||
aea6173f RS |
1371 | /* This is to make sure that loadup.el gives a clear picture |
1372 | of what files are preloaded and when. */ | |
4c103b64 | 1373 | /*if (! NILP (Vpurify_flag)) |
ab4db096 | 1374 | error ("Attempt to autoload %s while preparing to dump", |
4c103b64 | 1375 | SDATA (SYMBOL_NAME (funname)));*/ |
ab4db096 | 1376 | |
b7826503 | 1377 | CHECK_SYMBOL (funname); |
7abaf5cc | 1378 | GCPRO3 (funname, fundef, macro_only); |
db9f0278 | 1379 | |
f87740dc | 1380 | /* Preserve the match data. */ |
89f2614d | 1381 | record_unwind_save_match_data (); |
177c0ea7 | 1382 | |
a04ee161 RS |
1383 | /* If autoloading gets an error (which includes the error of failing |
1384 | to define the function being called), we use Vautoload_queue | |
1385 | to undo function definitions and `provide' calls made by | |
1386 | the function. We do this in the specific case of autoloading | |
1387 | because autoloading is not an explicit request "load this file", | |
1388 | but rather a request to "call this function". | |
d3da34e0 | 1389 | |
a04ee161 | 1390 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
1391 | record_unwind_protect (un_autoload, Vautoload_queue); |
1392 | Vautoload_queue = Qt; | |
7abaf5cc SM |
1393 | /* If `macro_only', assume this autoload to be a "best-effort", |
1394 | so don't signal an error if autoloading fails. */ | |
1395 | Fload (Fcar (Fcdr (fundef)), macro_only, Qt, Qnil, Qt); | |
2a49b6e5 | 1396 | |
db9f0278 JB |
1397 | /* Once loading finishes, don't undo it. */ |
1398 | Vautoload_queue = Qt; | |
3200038e | 1399 | dynwind_end (); |
db9f0278 | 1400 | |
ca20916b | 1401 | UNGCPRO; |
7abaf5cc SM |
1402 | |
1403 | if (NILP (funname)) | |
1404 | return Qnil; | |
1405 | else | |
1406 | { | |
1407 | Lisp_Object fun = Findirect_function (funname, Qnil); | |
1408 | ||
1409 | if (!NILP (Fequal (fun, fundef))) | |
1410 | error ("Autoloading failed to define function %s", | |
1411 | SDATA (SYMBOL_NAME (funname))); | |
1412 | else | |
1413 | return fun; | |
1414 | } | |
db9f0278 | 1415 | } |
4c576a83 | 1416 | |
db9f0278 | 1417 | \f |
a7ca3326 | 1418 | DEFUN ("eval", Feval, Seval, 1, 2, 0, |
a0ee6f27 | 1419 | doc: /* Evaluate FORM and return its value. |
8c27f5ff SM |
1420 | If LEXICAL is t, evaluate using lexical scoping. |
1421 | LEXICAL can also be an actual lexical environment, in the form of an | |
1422 | alist mapping symbols to their value. */) | |
a0ee6f27 | 1423 | (Lisp_Object form, Lisp_Object lexical) |
defb1411 | 1424 | { |
3200038e | 1425 | dynwind_begin (); |
a0ee6f27 | 1426 | specbind (Qinternal_interpreter_environment, |
6c6f1994 | 1427 | CONSP (lexical) || NILP (lexical) ? lexical : list1 (Qt)); |
3200038e BT |
1428 | Lisp_Object tem0 = eval_sub (form); |
1429 | dynwind_end (); | |
1430 | return tem0; | |
defb1411 SM |
1431 | } |
1432 | ||
5e301d76 PE |
1433 | /* Grow the specpdl stack by one entry. |
1434 | The caller should have already initialized the entry. | |
1435 | Signal an error on stack overflow. | |
1436 | ||
1437 | Make sure that there is always one unused entry past the top of the | |
1438 | stack, so that the just-initialized entry is safely unwound if | |
1439 | memory exhausted and an error is signaled here. Also, allocate a | |
1440 | never-used entry just before the bottom of the stack; sometimes its | |
1441 | address is taken. */ | |
1442 | ||
2f592f95 SM |
1443 | static void |
1444 | grow_specpdl (void) | |
1445 | { | |
5e301d76 PE |
1446 | specpdl_ptr++; |
1447 | ||
1448 | if (specpdl_ptr == specpdl + specpdl_size) | |
2f592f95 | 1449 | { |
5e301d76 PE |
1450 | ptrdiff_t count = SPECPDL_INDEX (); |
1451 | ptrdiff_t max_size = min (max_specpdl_size, PTRDIFF_MAX - 1000); | |
1452 | union specbinding *pdlvec = specpdl - 1; | |
1453 | ptrdiff_t pdlvecsize = specpdl_size + 1; | |
2f592f95 | 1454 | if (max_size <= specpdl_size) |
5e301d76 PE |
1455 | { |
1456 | if (max_specpdl_size < 400) | |
1457 | max_size = max_specpdl_size = 400; | |
1458 | if (max_size <= specpdl_size) | |
1459 | signal_error ("Variable binding depth exceeds max-specpdl-size", | |
1460 | Qnil); | |
1461 | } | |
1462 | pdlvec = xpalloc (pdlvec, &pdlvecsize, 1, max_size + 1, sizeof *specpdl); | |
1463 | specpdl = pdlvec + 1; | |
1464 | specpdl_size = pdlvecsize - 1; | |
1465 | specpdl_ptr = specpdl + count; | |
2f592f95 | 1466 | } |
2f592f95 SM |
1467 | } |
1468 | ||
316bec86 BT |
1469 | static void |
1470 | set_lisp_eval_depth (void *data) | |
1471 | { | |
1472 | EMACS_INT n = (EMACS_INT) data; | |
1473 | lisp_eval_depth = n; | |
2f592f95 SM |
1474 | } |
1475 | ||
defb1411 SM |
1476 | /* Eval a sub-expression of the current expression (i.e. in the same |
1477 | lexical scope). */ | |
1f183cec BT |
1478 | static Lisp_Object |
1479 | eval_sub_1 (Lisp_Object form) | |
db9f0278 | 1480 | { |
db9f0278 | 1481 | QUIT; |
7a7dfc01 | 1482 | return scm_call_1 (eval_fn, form); |
db9f0278 | 1483 | } |
1f183cec BT |
1484 | |
1485 | Lisp_Object | |
1486 | eval_sub (Lisp_Object form) | |
1487 | { | |
1488 | return scm_c_value_ref (eval_sub_1 (form), 0); | |
1489 | } | |
1490 | \f | |
1491 | static Lisp_Object | |
1492 | values_to_list (Lisp_Object values) | |
1493 | { | |
1494 | Lisp_Object list = Qnil; | |
1495 | for (int i = scm_c_nvalues (values) - 1; i >= 0; i--) | |
1496 | list = Fcons (scm_c_value_ref (values, i), list); | |
1497 | return list; | |
1498 | } | |
1499 | ||
1500 | DEFUN ("multiple-value-call", Fmultiple_value_call, Smultiple_value_call, | |
1501 | 2, UNEVALLED, 0, | |
1502 | doc: /* Call with multiple values. | |
1503 | usage: (multiple-value-call FUNCTION-FORM FORM) */) | |
1504 | (Lisp_Object args) | |
1505 | { | |
1506 | Lisp_Object function_form = eval_sub (XCAR (args)); | |
1507 | Lisp_Object values = Qnil; | |
1508 | while (CONSP (args = XCDR (args))) | |
1509 | values = nconc2 (Fnreverse (values_to_list (eval_sub_1 (XCAR (args)))), | |
1510 | values); | |
1511 | return apply1 (function_form, Fnreverse (values)); | |
1512 | } | |
1513 | ||
1514 | DEFUN ("values", Fvalues, Svalues, 0, MANY, 0, | |
1515 | doc: /* Return multiple values. */) | |
1516 | (ptrdiff_t nargs, Lisp_Object *args) | |
1517 | { | |
1518 | return scm_c_values (args, nargs); | |
1519 | } | |
db9f0278 | 1520 | \f |
1bf3ed7c RT |
1521 | Lisp_Object |
1522 | Fapply (ptrdiff_t nargs, Lisp_Object *args) | |
db9f0278 | 1523 | { |
d311d28c PE |
1524 | ptrdiff_t i; |
1525 | EMACS_INT numargs; | |
db9f0278 JB |
1526 | register Lisp_Object spread_arg; |
1527 | register Lisp_Object *funcall_args; | |
3a7a9129 | 1528 | Lisp_Object fun, retval; |
96d44c64 | 1529 | struct gcpro gcpro1; |
3a7a9129 | 1530 | USE_SAFE_ALLOCA; |
db9f0278 JB |
1531 | |
1532 | fun = args [0]; | |
1533 | funcall_args = 0; | |
1534 | spread_arg = args [nargs - 1]; | |
b7826503 | 1535 | CHECK_LIST (spread_arg); |
177c0ea7 | 1536 | |
db9f0278 JB |
1537 | numargs = XINT (Flength (spread_arg)); |
1538 | ||
1539 | if (numargs == 0) | |
1540 | return Ffuncall (nargs - 1, args); | |
1541 | else if (numargs == 1) | |
1542 | { | |
03699b14 | 1543 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
1544 | return Ffuncall (nargs, args); |
1545 | } | |
1546 | ||
a6e3fa71 | 1547 | numargs += nargs - 2; |
db9f0278 | 1548 | |
8788120f | 1549 | /* Optimize for no indirection. */ |
eadf1faa | 1550 | if (SYMBOLP (fun) && !NILP (fun) |
d8ccbf1a | 1551 | && (fun = SYMBOL_FUNCTION (fun), SYMBOLP (fun))) |
8788120f | 1552 | fun = indirect_function (fun); |
eadf1faa | 1553 | if (NILP (fun)) |
db9f0278 | 1554 | { |
f6d62986 | 1555 | /* Let funcall get the error. */ |
ffd56f97 | 1556 | fun = args[0]; |
db9f0278 JB |
1557 | } |
1558 | ||
db9f0278 JB |
1559 | /* We add 1 to numargs because funcall_args includes the |
1560 | function itself as well as its arguments. */ | |
1561 | if (!funcall_args) | |
a6e3fa71 | 1562 | { |
b72e0717 | 1563 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
1564 | GCPRO1 (*funcall_args); |
1565 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
1566 | } |
1567 | ||
663e2b3f | 1568 | memcpy (funcall_args, args, nargs * word_size); |
db9f0278 JB |
1569 | /* Spread the last arg we got. Its first element goes in |
1570 | the slot that it used to occupy, hence this value of I. */ | |
1571 | i = nargs - 1; | |
265a9e55 | 1572 | while (!NILP (spread_arg)) |
db9f0278 | 1573 | { |
03699b14 KR |
1574 | funcall_args [i++] = XCAR (spread_arg); |
1575 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 1576 | } |
a6e3fa71 | 1577 | |
96d44c64 | 1578 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
1579 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
1580 | UNGCPRO; | |
1581 | SAFE_FREE (); | |
1582 | ||
1583 | return retval; | |
db9f0278 JB |
1584 | } |
1585 | \f | |
ff936e53 SM |
1586 | /* Run hook variables in various ways. */ |
1587 | ||
f6d62986 | 1588 | static Lisp_Object |
f66c7cf8 | 1589 | funcall_nil (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
1590 | { |
1591 | Ffuncall (nargs, args); | |
1592 | return Qnil; | |
1593 | } | |
ff936e53 | 1594 | |
a7ca3326 | 1595 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 1596 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
1597 | Each argument should be a symbol, a hook variable. |
1598 | These symbols are processed in the order specified. | |
1599 | If a hook symbol has a non-nil value, that value may be a function | |
1600 | or a list of functions to be called to run the hook. | |
1601 | If the value is a function, it is called with no arguments. | |
1602 | If it is a list, the elements are called, in order, with no arguments. | |
1603 | ||
9f685258 LK |
1604 | Major modes should not use this function directly to run their mode |
1605 | hook; they should use `run-mode-hooks' instead. | |
1606 | ||
72e85d5d RS |
1607 | Do not use `make-local-variable' to make a hook variable buffer-local. |
1608 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 1609 | usage: (run-hooks &rest HOOKS) */) |
f66c7cf8 | 1610 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 SM |
1611 | { |
1612 | Lisp_Object hook[1]; | |
f66c7cf8 | 1613 | ptrdiff_t i; |
ff936e53 SM |
1614 | |
1615 | for (i = 0; i < nargs; i++) | |
1616 | { | |
1617 | hook[0] = args[i]; | |
f6d62986 | 1618 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
1619 | } |
1620 | ||
1621 | return Qnil; | |
1622 | } | |
177c0ea7 | 1623 | |
a7ca3326 | 1624 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
1625 | Srun_hook_with_args, 1, MANY, 0, |
1626 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
1627 | HOOK should be a symbol, a hook variable. The value of HOOK |
1628 | may be nil, a function, or a list of functions. Call each | |
1629 | function in order with arguments ARGS. The final return value | |
1630 | is unspecified. | |
9dbc9081 | 1631 | |
72e85d5d RS |
1632 | Do not use `make-local-variable' to make a hook variable buffer-local. |
1633 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 1634 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
f66c7cf8 | 1635 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 1636 | { |
f6d62986 | 1637 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
1638 | } |
1639 | ||
d393cefb GM |
1640 | /* NB this one still documents a specific non-nil return value. |
1641 | (As did run-hook-with-args and run-hook-with-args-until-failure | |
1642 | until they were changed in 24.1.) */ | |
a0d76c27 | 1643 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
1644 | Srun_hook_with_args_until_success, 1, MANY, 0, |
1645 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
1646 | HOOK should be a symbol, a hook variable. The value of HOOK |
1647 | may be nil, a function, or a list of functions. Call each | |
1648 | function in order with arguments ARGS, stopping at the first | |
1649 | one that returns non-nil, and return that value. Otherwise (if | |
1650 | all functions return nil, or if there are no functions to call), | |
1651 | return nil. | |
9dbc9081 | 1652 | |
72e85d5d RS |
1653 | Do not use `make-local-variable' to make a hook variable buffer-local. |
1654 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 1655 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
f66c7cf8 | 1656 | (ptrdiff_t nargs, Lisp_Object *args) |
b0b667cb | 1657 | { |
f6d62986 SM |
1658 | return run_hook_with_args (nargs, args, Ffuncall); |
1659 | } | |
1660 | ||
1661 | static Lisp_Object | |
f66c7cf8 | 1662 | funcall_not (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
1663 | { |
1664 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
1665 | } |
1666 | ||
a7ca3326 | 1667 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
1668 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
1669 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
1670 | HOOK should be a symbol, a hook variable. The value of HOOK |
1671 | may be nil, a function, or a list of functions. Call each | |
1672 | function in order with arguments ARGS, stopping at the first | |
1673 | one that returns nil, and return nil. Otherwise (if all functions | |
1674 | return non-nil, or if there are no functions to call), return non-nil | |
1675 | \(do not rely on the precise return value in this case). | |
9dbc9081 | 1676 | |
72e85d5d RS |
1677 | Do not use `make-local-variable' to make a hook variable buffer-local. |
1678 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 1679 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
f66c7cf8 | 1680 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 1681 | { |
f6d62986 | 1682 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
1683 | } |
1684 | ||
f6d62986 | 1685 | static Lisp_Object |
f66c7cf8 | 1686 | run_hook_wrapped_funcall (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
1687 | { |
1688 | Lisp_Object tmp = args[0], ret; | |
1689 | args[0] = args[1]; | |
1690 | args[1] = tmp; | |
1691 | ret = Ffuncall (nargs, args); | |
1692 | args[1] = args[0]; | |
1693 | args[0] = tmp; | |
1694 | return ret; | |
1695 | } | |
1696 | ||
1697 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
1698 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
1699 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
1700 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
1701 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
1702 | aborts and returns that value. | |
1703 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
f66c7cf8 | 1704 | (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
1705 | { |
1706 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
1707 | } | |
ff936e53 | 1708 | |
c933ea05 RS |
1709 | /* ARGS[0] should be a hook symbol. |
1710 | Call each of the functions in the hook value, passing each of them | |
1711 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 1712 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
1713 | The caller (or its caller, etc) must gcpro all of ARGS, |
1714 | except that it isn't necessary to gcpro ARGS[0]. */ | |
1715 | ||
f6d62986 | 1716 | Lisp_Object |
f66c7cf8 PE |
1717 | run_hook_with_args (ptrdiff_t nargs, Lisp_Object *args, |
1718 | Lisp_Object (*funcall) (ptrdiff_t nargs, Lisp_Object *args)) | |
ff936e53 | 1719 | { |
f6d62986 | 1720 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 1721 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 1722 | |
f029ca5f RS |
1723 | /* If we are dying or still initializing, |
1724 | don't do anything--it would probably crash if we tried. */ | |
1725 | if (NILP (Vrun_hooks)) | |
caff32a7 | 1726 | return Qnil; |
f029ca5f | 1727 | |
b0b667cb | 1728 | sym = args[0]; |
aa681b51 | 1729 | val = find_symbol_value (sym); |
ff936e53 | 1730 | |
b0b667cb | 1731 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 1732 | return ret; |
dee4ba59 | 1733 | else if (!CONSP (val) || FUNCTIONP (val)) |
b0b667cb KH |
1734 | { |
1735 | args[0] = val; | |
f6d62986 | 1736 | return funcall (nargs, args); |
b0b667cb KH |
1737 | } |
1738 | else | |
1739 | { | |
1faed8ae PE |
1740 | Lisp_Object global_vals = Qnil; |
1741 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 1742 | |
ff936e53 | 1743 | for (; |
f6d62986 | 1744 | CONSP (val) && NILP (ret); |
03699b14 | 1745 | val = XCDR (val)) |
b0b667cb | 1746 | { |
03699b14 | 1747 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
1748 | { |
1749 | /* t indicates this hook has a local binding; | |
1750 | it means to run the global binding too. */ | |
1faed8ae PE |
1751 | global_vals = Fdefault_value (sym); |
1752 | if (NILP (global_vals)) continue; | |
b0b667cb | 1753 | |
1faed8ae | 1754 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 1755 | { |
1faed8ae | 1756 | args[0] = global_vals; |
f6d62986 | 1757 | ret = funcall (nargs, args); |
8932b1c2 CY |
1758 | } |
1759 | else | |
1760 | { | |
1761 | for (; | |
f6d62986 | 1762 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 1763 | global_vals = XCDR (global_vals)) |
8932b1c2 | 1764 | { |
1faed8ae | 1765 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
1766 | /* In a global value, t should not occur. If it does, we |
1767 | must ignore it to avoid an endless loop. */ | |
1768 | if (!EQ (args[0], Qt)) | |
f6d62986 | 1769 | ret = funcall (nargs, args); |
8932b1c2 | 1770 | } |
b0b667cb KH |
1771 | } |
1772 | } | |
1773 | else | |
1774 | { | |
03699b14 | 1775 | args[0] = XCAR (val); |
f6d62986 | 1776 | ret = funcall (nargs, args); |
b0b667cb KH |
1777 | } |
1778 | } | |
cb9d21f8 RS |
1779 | |
1780 | UNGCPRO; | |
ff936e53 | 1781 | return ret; |
b0b667cb KH |
1782 | } |
1783 | } | |
c933ea05 | 1784 | |
7d48558f RS |
1785 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
1786 | ||
1787 | void | |
d3da34e0 | 1788 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
1789 | { |
1790 | Lisp_Object temp[3]; | |
1791 | temp[0] = hook; | |
1792 | temp[1] = arg1; | |
1793 | temp[2] = arg2; | |
1794 | ||
1795 | Frun_hook_with_args (3, temp); | |
1796 | } | |
ff936e53 | 1797 | \f |
f6d62986 | 1798 | /* Apply fn to arg. */ |
db9f0278 | 1799 | Lisp_Object |
d3da34e0 | 1800 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 1801 | { |
a6e3fa71 JB |
1802 | struct gcpro gcpro1; |
1803 | ||
1804 | GCPRO1 (fn); | |
265a9e55 | 1805 | if (NILP (arg)) |
3200038e | 1806 | return Ffuncall (1, &fn); |
a6e3fa71 | 1807 | gcpro1.nvars = 2; |
db9f0278 JB |
1808 | { |
1809 | Lisp_Object args[2]; | |
1810 | args[0] = fn; | |
1811 | args[1] = arg; | |
a6e3fa71 | 1812 | gcpro1.var = args; |
3200038e | 1813 | return Fapply (2, args); |
db9f0278 | 1814 | } |
db9f0278 JB |
1815 | } |
1816 | ||
f6d62986 | 1817 | /* Call function fn on no arguments. */ |
db9f0278 | 1818 | Lisp_Object |
d3da34e0 | 1819 | call0 (Lisp_Object fn) |
db9f0278 | 1820 | { |
a6e3fa71 JB |
1821 | struct gcpro gcpro1; |
1822 | ||
1823 | GCPRO1 (fn); | |
3200038e | 1824 | return Ffuncall (1, &fn); |
db9f0278 JB |
1825 | } |
1826 | ||
f6d62986 | 1827 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
1828 | /* ARGSUSED */ |
1829 | Lisp_Object | |
d3da34e0 | 1830 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 1831 | { |
a6e3fa71 | 1832 | struct gcpro gcpro1; |
177c0ea7 | 1833 | Lisp_Object args[2]; |
a6e3fa71 | 1834 | |
db9f0278 | 1835 | args[0] = fn; |
15285f9f | 1836 | args[1] = arg1; |
a6e3fa71 JB |
1837 | GCPRO1 (args[0]); |
1838 | gcpro1.nvars = 2; | |
3200038e | 1839 | return Ffuncall (2, args); |
db9f0278 JB |
1840 | } |
1841 | ||
f6d62986 | 1842 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
1843 | /* ARGSUSED */ |
1844 | Lisp_Object | |
d3da34e0 | 1845 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 1846 | { |
a6e3fa71 | 1847 | struct gcpro gcpro1; |
db9f0278 JB |
1848 | Lisp_Object args[3]; |
1849 | args[0] = fn; | |
15285f9f RS |
1850 | args[1] = arg1; |
1851 | args[2] = arg2; | |
a6e3fa71 JB |
1852 | GCPRO1 (args[0]); |
1853 | gcpro1.nvars = 3; | |
3200038e | 1854 | return Ffuncall (3, args); |
db9f0278 JB |
1855 | } |
1856 | ||
f6d62986 | 1857 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
1858 | /* ARGSUSED */ |
1859 | Lisp_Object | |
d3da34e0 | 1860 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 1861 | { |
a6e3fa71 | 1862 | struct gcpro gcpro1; |
db9f0278 JB |
1863 | Lisp_Object args[4]; |
1864 | args[0] = fn; | |
15285f9f RS |
1865 | args[1] = arg1; |
1866 | args[2] = arg2; | |
1867 | args[3] = arg3; | |
a6e3fa71 JB |
1868 | GCPRO1 (args[0]); |
1869 | gcpro1.nvars = 4; | |
3200038e | 1870 | return Ffuncall (4, args); |
db9f0278 JB |
1871 | } |
1872 | ||
f6d62986 | 1873 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
1874 | /* ARGSUSED */ |
1875 | Lisp_Object | |
d3da34e0 JB |
1876 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
1877 | Lisp_Object arg4) | |
a5a44b91 JB |
1878 | { |
1879 | struct gcpro gcpro1; | |
a5a44b91 JB |
1880 | Lisp_Object args[5]; |
1881 | args[0] = fn; | |
15285f9f RS |
1882 | args[1] = arg1; |
1883 | args[2] = arg2; | |
1884 | args[3] = arg3; | |
1885 | args[4] = arg4; | |
a5a44b91 JB |
1886 | GCPRO1 (args[0]); |
1887 | gcpro1.nvars = 5; | |
3200038e | 1888 | return Ffuncall (5, args); |
a5a44b91 JB |
1889 | } |
1890 | ||
f6d62986 | 1891 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
1892 | /* ARGSUSED */ |
1893 | Lisp_Object | |
d3da34e0 JB |
1894 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
1895 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
1896 | { |
1897 | struct gcpro gcpro1; | |
15285f9f RS |
1898 | Lisp_Object args[6]; |
1899 | args[0] = fn; | |
1900 | args[1] = arg1; | |
1901 | args[2] = arg2; | |
1902 | args[3] = arg3; | |
1903 | args[4] = arg4; | |
1904 | args[5] = arg5; | |
1905 | GCPRO1 (args[0]); | |
1906 | gcpro1.nvars = 6; | |
3200038e | 1907 | return Ffuncall (6, args); |
15285f9f RS |
1908 | } |
1909 | ||
f6d62986 | 1910 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
1911 | /* ARGSUSED */ |
1912 | Lisp_Object | |
d3da34e0 JB |
1913 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
1914 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
1915 | { |
1916 | struct gcpro gcpro1; | |
15285f9f RS |
1917 | Lisp_Object args[7]; |
1918 | args[0] = fn; | |
1919 | args[1] = arg1; | |
1920 | args[2] = arg2; | |
1921 | args[3] = arg3; | |
1922 | args[4] = arg4; | |
1923 | args[5] = arg5; | |
1924 | args[6] = arg6; | |
1925 | GCPRO1 (args[0]); | |
1926 | gcpro1.nvars = 7; | |
3200038e | 1927 | return Ffuncall (7, args); |
15285f9f RS |
1928 | } |
1929 | ||
f6d62986 | 1930 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
1931 | /* ARGSUSED */ |
1932 | Lisp_Object | |
d3da34e0 JB |
1933 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
1934 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
1935 | { |
1936 | struct gcpro gcpro1; | |
574c05e2 KK |
1937 | Lisp_Object args[8]; |
1938 | args[0] = fn; | |
1939 | args[1] = arg1; | |
1940 | args[2] = arg2; | |
1941 | args[3] = arg3; | |
1942 | args[4] = arg4; | |
1943 | args[5] = arg5; | |
1944 | args[6] = arg6; | |
1945 | args[7] = arg7; | |
1946 | GCPRO1 (args[0]); | |
1947 | gcpro1.nvars = 8; | |
3200038e | 1948 | return Ffuncall (8, args); |
574c05e2 KK |
1949 | } |
1950 | ||
6c2ef893 RS |
1951 | /* The caller should GCPRO all the elements of ARGS. */ |
1952 | ||
a7ca3326 | 1953 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 1954 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 1955 | (Lisp_Object object) |
b9598260 | 1956 | { |
e1f29348 | 1957 | if (FUNCTIONP (object)) |
b9598260 | 1958 | return Qt; |
e1f29348 | 1959 | return Qnil; |
b9598260 SM |
1960 | } |
1961 | ||
7a7dfc01 | 1962 | static Lisp_Object |
1bf3ed7c | 1963 | Ffuncall1 (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 1964 | { |
1bf3ed7c | 1965 | return scm_call_n (funcall_fn, args, nargs); |
db9f0278 | 1966 | } |
1f183cec BT |
1967 | |
1968 | Lisp_Object | |
1969 | Ffuncall (ptrdiff_t nargs, Lisp_Object *args) | |
1970 | { | |
1971 | return scm_c_value_ref (Ffuncall1 (nargs, args), 0); | |
1972 | } | |
db9f0278 | 1973 | \f |
2f7c71a1 | 1974 | static Lisp_Object |
defb1411 | 1975 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
1976 | { |
1977 | Lisp_Object args_left; | |
d311d28c PE |
1978 | ptrdiff_t i; |
1979 | EMACS_INT numargs; | |
db9f0278 JB |
1980 | register Lisp_Object *arg_vector; |
1981 | struct gcpro gcpro1, gcpro2, gcpro3; | |
db9f0278 | 1982 | register Lisp_Object tem; |
3a7a9129 | 1983 | USE_SAFE_ALLOCA; |
db9f0278 | 1984 | |
f66c7cf8 | 1985 | numargs = XFASTINT (Flength (args)); |
c5101a77 | 1986 | SAFE_ALLOCA_LISP (arg_vector, numargs); |
db9f0278 JB |
1987 | args_left = args; |
1988 | ||
1989 | GCPRO3 (*arg_vector, args_left, fun); | |
1990 | gcpro1.nvars = 0; | |
1991 | ||
c5101a77 | 1992 | for (i = 0; i < numargs; ) |
db9f0278 JB |
1993 | { |
1994 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
db9f0278 JB |
1995 | arg_vector[i++] = tem; |
1996 | gcpro1.nvars = i; | |
1997 | } | |
1998 | ||
1999 | UNGCPRO; | |
2000 | ||
c5101a77 | 2001 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 | 2002 | |
3a7a9129 | 2003 | SAFE_FREE (); |
db9f0278 JB |
2004 | return tem; |
2005 | } | |
2006 | ||
2007 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2008 | and return the result of evaluation. | |
2009 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2010 | ||
2901f1d1 | 2011 | static Lisp_Object |
f66c7cf8 | 2012 | funcall_lambda (Lisp_Object fun, ptrdiff_t nargs, |
c5101a77 | 2013 | register Lisp_Object *arg_vector) |
db9f0278 | 2014 | { |
defb1411 | 2015 | Lisp_Object val, syms_left, next, lexenv; |
3200038e | 2016 | dynwind_begin (); |
f66c7cf8 | 2017 | ptrdiff_t i; |
1882aa38 | 2018 | bool optional, rest; |
db9f0278 | 2019 | |
90165123 | 2020 | if (CONSP (fun)) |
9ab90667 | 2021 | { |
defb1411 SM |
2022 | if (EQ (XCAR (fun), Qclosure)) |
2023 | { | |
2024 | fun = XCDR (fun); /* Drop `closure'. */ | |
2025 | lexenv = XCAR (fun); | |
23aba0ea | 2026 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
2027 | } |
2028 | else | |
2029 | lexenv = Qnil; | |
9ab90667 GM |
2030 | syms_left = XCDR (fun); |
2031 | if (CONSP (syms_left)) | |
2032 | syms_left = XCAR (syms_left); | |
2033 | else | |
734d55a2 | 2034 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 2035 | } |
9ab90667 | 2036 | else |
1088b922 | 2037 | emacs_abort (); |
db9f0278 | 2038 | |
9ab90667 GM |
2039 | i = optional = rest = 0; |
2040 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
2041 | { |
2042 | QUIT; | |
177c0ea7 | 2043 | |
9ab90667 | 2044 | next = XCAR (syms_left); |
8788120f | 2045 | if (!SYMBOLP (next)) |
734d55a2 | 2046 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 2047 | |
db9f0278 JB |
2048 | if (EQ (next, Qand_rest)) |
2049 | rest = 1; | |
2050 | else if (EQ (next, Qand_optional)) | |
2051 | optional = 1; | |
db9f0278 | 2052 | else |
db9f0278 | 2053 | { |
e610eaca | 2054 | Lisp_Object arg; |
defb1411 SM |
2055 | if (rest) |
2056 | { | |
e610eaca | 2057 | arg = Flist (nargs - i, &arg_vector[i]); |
defb1411 SM |
2058 | i = nargs; |
2059 | } | |
2060 | else if (i < nargs) | |
e610eaca | 2061 | arg = arg_vector[i++]; |
b9598260 SM |
2062 | else if (!optional) |
2063 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
2064 | else | |
e610eaca | 2065 | arg = Qnil; |
7200d79c | 2066 | |
b9598260 | 2067 | /* Bind the argument. */ |
876c194c | 2068 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 | 2069 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
e610eaca | 2070 | lexenv = Fcons (Fcons (next, arg), lexenv); |
b9598260 SM |
2071 | else |
2072 | /* Dynamically bind NEXT. */ | |
e610eaca | 2073 | specbind (next, arg); |
db9f0278 | 2074 | } |
db9f0278 JB |
2075 | } |
2076 | ||
9ab90667 | 2077 | if (!NILP (syms_left)) |
734d55a2 | 2078 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 2079 | else if (i < nargs) |
734d55a2 | 2080 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 2081 | |
b9598260 SM |
2082 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
2083 | /* Instantiate a new lexical environment. */ | |
2084 | specbind (Qinternal_interpreter_environment, lexenv); | |
2085 | ||
98c87aa3 | 2086 | val = Fprogn (XCDR (XCDR (fun))); |
177c0ea7 | 2087 | |
3200038e BT |
2088 | dynwind_end (); |
2089 | return val; | |
db9f0278 | 2090 | } |
661c7d6e KH |
2091 | |
2092 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
2093 | 1, 1, 0, |
2094 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 2095 | (Lisp_Object object) |
661c7d6e KH |
2096 | { |
2097 | Lisp_Object tem; | |
2098 | ||
845975f5 | 2099 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 2100 | { |
845975f5 | 2101 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 2102 | if (!CONSP (tem)) |
845975f5 SM |
2103 | { |
2104 | tem = AREF (object, COMPILED_BYTECODE); | |
2105 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 2106 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
2107 | else |
2108 | error ("Invalid byte code"); | |
2109 | } | |
3ae565b3 SM |
2110 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
2111 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
2112 | } |
2113 | return object; | |
2114 | } | |
db9f0278 | 2115 | \f |
2f592f95 SM |
2116 | /* Return true if SYMBOL currently has a let-binding |
2117 | which was made in the buffer that is now current. */ | |
2118 | ||
2119 | bool | |
db633ecc | 2120 | let_shadows_buffer_binding_p (sym_t symbol) |
db9f0278 | 2121 | { |
9349e5f7 | 2122 | union specbinding *p; |
2f592f95 SM |
2123 | Lisp_Object buf = Fcurrent_buffer (); |
2124 | ||
2125 | for (p = specpdl_ptr; p > specpdl; ) | |
2126 | if ((--p)->kind > SPECPDL_LET) | |
2127 | { | |
db633ecc BT |
2128 | sym_t let_bound_symbol = XSYMBOL (specpdl_symbol (p)); |
2129 | eassert (SYMBOL_REDIRECT (let_bound_symbol) != SYMBOL_VARALIAS); | |
2f592f95 SM |
2130 | if (symbol == let_bound_symbol |
2131 | && EQ (specpdl_where (p), buf)) | |
2132 | return 1; | |
2133 | } | |
2134 | ||
2135 | return 0; | |
2136 | } | |
2137 | ||
2138 | bool | |
2139 | let_shadows_global_binding_p (Lisp_Object symbol) | |
2140 | { | |
9349e5f7 | 2141 | union specbinding *p; |
2f592f95 SM |
2142 | |
2143 | for (p = specpdl_ptr; p > specpdl; ) | |
2144 | if ((--p)->kind >= SPECPDL_LET && EQ (specpdl_symbol (p), symbol)) | |
2145 | return 1; | |
2146 | ||
2147 | return 0; | |
db9f0278 JB |
2148 | } |
2149 | ||
3ec7babc | 2150 | /* `specpdl_ptr' describes which variable is |
4e2db1fe | 2151 | let-bound, so it can be properly undone when we unbind_to. |
3ec7babc SM |
2152 | It can be either a plain SPECPDL_LET or a SPECPDL_LET_LOCAL/DEFAULT. |
2153 | - SYMBOL is the variable being bound. Note that it should not be | |
4e2db1fe SM |
2154 | aliased (i.e. when let-binding V1 that's aliased to V2, we want |
2155 | to record V2 here). | |
3ec7babc SM |
2156 | - WHERE tells us in which buffer the binding took place. |
2157 | This is used for SPECPDL_LET_LOCAL bindings (i.e. bindings to a | |
2158 | buffer-local variable) as well as for SPECPDL_LET_DEFAULT bindings, | |
2159 | i.e. bindings to the default value of a variable which can be | |
2160 | buffer-local. */ | |
4e2db1fe | 2161 | |
db9f0278 | 2162 | void |
d3da34e0 | 2163 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 2164 | { |
db633ecc | 2165 | sym_t sym; |
ce5b453a | 2166 | |
b7826503 | 2167 | CHECK_SYMBOL (symbol); |
ce5b453a | 2168 | sym = XSYMBOL (symbol); |
719177b3 | 2169 | |
ce5b453a | 2170 | start: |
db633ecc | 2171 | switch (SYMBOL_REDIRECT (sym)) |
719177b3 | 2172 | { |
ce5b453a SM |
2173 | case SYMBOL_VARALIAS: |
2174 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
2175 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
2176 | /* The most common case is that of a non-constant symbol with a |
2177 | trivial value. Make that as fast as we can. */ | |
9349e5f7 PE |
2178 | specpdl_ptr->let.kind = SPECPDL_LET; |
2179 | specpdl_ptr->let.symbol = symbol; | |
2180 | specpdl_ptr->let.old_value = SYMBOL_VAL (sym); | |
5e301d76 | 2181 | grow_specpdl (); |
db633ecc | 2182 | if (! SYMBOL_CONSTANT (sym)) |
bb8e180f AS |
2183 | SET_SYMBOL_VAL (sym, value); |
2184 | else | |
2185 | set_internal (symbol, value, Qnil, 1); | |
2186 | break; | |
4e2db1fe SM |
2187 | case SYMBOL_LOCALIZED: |
2188 | if (SYMBOL_BLV (sym)->frame_local) | |
2189 | error ("Frame-local vars cannot be let-bound"); | |
2190 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
2191 | { |
2192 | Lisp_Object ovalue = find_symbol_value (symbol); | |
9349e5f7 PE |
2193 | specpdl_ptr->let.kind = SPECPDL_LET_LOCAL; |
2194 | specpdl_ptr->let.symbol = symbol; | |
2195 | specpdl_ptr->let.old_value = ovalue; | |
2196 | specpdl_ptr->let.where = Fcurrent_buffer (); | |
ce5b453a | 2197 | |
db633ecc | 2198 | eassert (SYMBOL_REDIRECT (sym) != SYMBOL_LOCALIZED |
2f592f95 | 2199 | || (EQ (SYMBOL_BLV (sym)->where, Fcurrent_buffer ()))); |
ce5b453a | 2200 | |
db633ecc | 2201 | if (SYMBOL_REDIRECT (sym) == SYMBOL_LOCALIZED) |
2f592f95 SM |
2202 | { |
2203 | if (!blv_found (SYMBOL_BLV (sym))) | |
9349e5f7 | 2204 | specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT; |
2f592f95 SM |
2205 | } |
2206 | else if (BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
ce5b453a | 2207 | { |
ce5b453a SM |
2208 | /* If SYMBOL is a per-buffer variable which doesn't have a |
2209 | buffer-local value here, make the `let' change the global | |
2210 | value by changing the value of SYMBOL in all buffers not | |
2211 | having their own value. This is consistent with what | |
2212 | happens with other buffer-local variables. */ | |
2f592f95 | 2213 | if (NILP (Flocal_variable_p (symbol, Qnil))) |
ce5b453a | 2214 | { |
9349e5f7 | 2215 | specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT; |
5e301d76 | 2216 | grow_specpdl (); |
ce5b453a | 2217 | Fset_default (symbol, value); |
316bec86 | 2218 | goto done; |
ce5b453a SM |
2219 | } |
2220 | } | |
2221 | else | |
9349e5f7 | 2222 | specpdl_ptr->let.kind = SPECPDL_LET; |
ce5b453a | 2223 | |
5e301d76 | 2224 | grow_specpdl (); |
94b612ad | 2225 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
2226 | break; |
2227 | } | |
1088b922 | 2228 | default: emacs_abort (); |
9ab90667 | 2229 | } |
316bec86 BT |
2230 | |
2231 | done: | |
2232 | scm_dynwind_unwind_handler (unbind_once, NULL, SCM_F_WIND_EXPLICITLY); | |
db9f0278 JB |
2233 | } |
2234 | ||
f4b1eb36 PE |
2235 | /* Push unwind-protect entries of various types. */ |
2236 | ||
db9f0278 | 2237 | void |
e1ad689c BT |
2238 | record_unwind_protect_1 (void (*function) (Lisp_Object), Lisp_Object arg, |
2239 | bool wind_explicitly) | |
db9f0278 | 2240 | { |
316bec86 | 2241 | record_unwind_protect_ptr_1 (function, arg, wind_explicitly); |
db9f0278 JB |
2242 | } |
2243 | ||
27e498e6 | 2244 | void |
e1ad689c | 2245 | record_unwind_protect (void (*function) (Lisp_Object), Lisp_Object arg) |
27e498e6 | 2246 | { |
e1ad689c | 2247 | record_unwind_protect_1 (function, arg, true); |
27e498e6 PE |
2248 | } |
2249 | ||
2250 | void | |
e1ad689c BT |
2251 | record_unwind_protect_ptr_1 (void (*function) (void *), void *arg, |
2252 | bool wind_explicitly) | |
27e498e6 | 2253 | { |
316bec86 BT |
2254 | scm_dynwind_unwind_handler (function, |
2255 | arg, | |
2256 | (wind_explicitly | |
2257 | ? SCM_F_WIND_EXPLICITLY | |
2258 | : 0)); | |
27e498e6 PE |
2259 | } |
2260 | ||
2261 | void | |
e1ad689c | 2262 | record_unwind_protect_ptr (void (*function) (void *), void *arg) |
27e498e6 | 2263 | { |
e1ad689c | 2264 | record_unwind_protect_ptr_1 (function, arg, true); |
27e498e6 PE |
2265 | } |
2266 | ||
f4b1eb36 | 2267 | void |
e1ad689c BT |
2268 | record_unwind_protect_int_1 (void (*function) (int), int arg, |
2269 | bool wind_explicitly) | |
f4b1eb36 | 2270 | { |
316bec86 | 2271 | record_unwind_protect_ptr_1 (function, arg, wind_explicitly); |
f4b1eb36 PE |
2272 | } |
2273 | ||
a0931322 | 2274 | void |
e1ad689c | 2275 | record_unwind_protect_int (void (*function) (int), int arg) |
a0931322 | 2276 | { |
e1ad689c | 2277 | record_unwind_protect_int_1 (function, arg, true); |
a0931322 PE |
2278 | } |
2279 | ||
316bec86 BT |
2280 | static void |
2281 | call_void (void *data) | |
2282 | { | |
2283 | ((void (*) (void)) data) (); | |
2284 | } | |
2285 | ||
94fcd171 | 2286 | void |
e1ad689c BT |
2287 | record_unwind_protect_void_1 (void (*function) (void), |
2288 | bool wind_explicitly) | |
94fcd171 | 2289 | { |
316bec86 | 2290 | record_unwind_protect_ptr_1 (call_void, function, wind_explicitly); |
94fcd171 PE |
2291 | } |
2292 | ||
a0931322 | 2293 | void |
e1ad689c | 2294 | record_unwind_protect_void (void (*function) (void)) |
a0931322 | 2295 | { |
e1ad689c | 2296 | record_unwind_protect_void_1 (function, true); |
a0931322 PE |
2297 | } |
2298 | ||
316bec86 BT |
2299 | static void |
2300 | unbind_once (void *ignore) | |
c26b5ed1 BT |
2301 | { |
2302 | /* Decrement specpdl_ptr before we do the work to unbind it, so | |
2303 | that an error in unbinding won't try to unbind the same entry | |
2304 | again. Take care to copy any parts of the binding needed | |
2305 | before invoking any code that can make more bindings. */ | |
2306 | ||
2307 | specpdl_ptr--; | |
2308 | ||
2309 | switch (specpdl_ptr->kind) | |
2310 | { | |
c26b5ed1 BT |
2311 | case SPECPDL_LET: |
2312 | { /* If variable has a trivial value (no forwarding), we can | |
2313 | just set it. No need to check for constant symbols here, | |
2314 | since that was already done by specbind. */ | |
db633ecc BT |
2315 | sym_t sym = XSYMBOL (specpdl_symbol (specpdl_ptr)); |
2316 | if (SYMBOL_REDIRECT (sym) == SYMBOL_PLAINVAL) | |
c26b5ed1 BT |
2317 | { |
2318 | SET_SYMBOL_VAL (sym, specpdl_old_value (specpdl_ptr)); | |
2319 | break; | |
2320 | } | |
2321 | else | |
2322 | { /* FALLTHROUGH!! | |
2323 | NOTE: we only ever come here if make_local_foo was used for | |
2324 | the first time on this var within this let. */ | |
2325 | } | |
2326 | } | |
2327 | case SPECPDL_LET_DEFAULT: | |
2328 | Fset_default (specpdl_symbol (specpdl_ptr), | |
2329 | specpdl_old_value (specpdl_ptr)); | |
2330 | break; | |
2331 | case SPECPDL_LET_LOCAL: | |
2332 | { | |
2333 | Lisp_Object symbol = specpdl_symbol (specpdl_ptr); | |
2334 | Lisp_Object where = specpdl_where (specpdl_ptr); | |
2335 | Lisp_Object old_value = specpdl_old_value (specpdl_ptr); | |
2336 | eassert (BUFFERP (where)); | |
2337 | ||
2338 | /* If this was a local binding, reset the value in the appropriate | |
2339 | buffer, but only if that buffer's binding still exists. */ | |
2340 | if (!NILP (Flocal_variable_p (symbol, where))) | |
2341 | set_internal (symbol, old_value, where, 1); | |
2342 | } | |
2343 | break; | |
2344 | } | |
2345 | } | |
2346 | ||
e1ad689c BT |
2347 | void |
2348 | dynwind_begin (void) | |
2349 | { | |
316bec86 | 2350 | scm_dynwind_begin (0); |
e1ad689c | 2351 | } |
f4b1eb36 | 2352 | |
e1ad689c BT |
2353 | void |
2354 | dynwind_end (void) | |
2355 | { | |
316bec86 | 2356 | scm_dynwind_end (); |
e1ad689c BT |
2357 | } |
2358 | ||
4a330052 | 2359 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
2360 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
2361 | A special variable is one that will be bound dynamically, even in a | |
2362 | context where binding is lexical by default. */) | |
c566235d | 2363 | (Lisp_Object symbol) |
b9598260 SM |
2364 | { |
2365 | CHECK_SYMBOL (symbol); | |
db633ecc | 2366 | return SYMBOL_DECLARED_SPECIAL (XSYMBOL (symbol)) ? Qt : Qnil; |
b9598260 | 2367 | } |
316bec86 BT |
2368 | \f |
2369 | _Noreturn SCM | |
2370 | abort_to_prompt (SCM tag, SCM arglst) | |
2371 | { | |
2372 | static SCM var = SCM_UNDEFINED; | |
2373 | if (SCM_UNBNDP (var)) | |
2374 | var = scm_c_public_lookup ("guile", "abort-to-prompt"); | |
4ce0541e | 2375 | |
316bec86 BT |
2376 | scm_apply_1 (scm_variable_ref (var), tag, arglst); |
2377 | emacs_abort (); | |
2378 | } | |
2379 | ||
2380 | SCM | |
2381 | call_with_prompt (SCM tag, SCM thunk, SCM handler) | |
2382 | { | |
2383 | static SCM var = SCM_UNDEFINED; | |
2384 | if (SCM_UNBNDP (var)) | |
2385 | var = scm_c_public_lookup ("guile", "call-with-prompt"); | |
2386 | ||
2387 | return scm_call_3 (scm_variable_ref (var), tag, thunk, handler); | |
2388 | } | |
2389 | ||
2390 | SCM | |
2391 | make_prompt_tag (void) | |
2392 | { | |
2393 | static SCM var = SCM_UNDEFINED; | |
2394 | if (SCM_UNBNDP (var)) | |
2395 | var = scm_c_public_lookup ("guile", "make-prompt-tag"); | |
2396 | ||
2397 | return scm_call_0 (scm_variable_ref (var)); | |
2398 | } | |
2399 | \f | |
dfcf069d | 2400 | void |
d3da34e0 | 2401 | syms_of_eval (void) |
db9f0278 | 2402 | { |
172a66a1 BT |
2403 | #include "eval.x" |
2404 | ||
29208e82 | 2405 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
fb7ada5f | 2406 | doc: /* Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 2407 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
2408 | an error is signaled. |
2409 | You can safely use a value considerably larger than the default value, | |
2410 | if that proves inconveniently small. However, if you increase it too far, | |
575593db DA |
2411 | Emacs could run out of memory trying to make the stack bigger. |
2412 | Note that this limit may be silently increased by the debugger | |
2413 | if `debug-on-error' or `debug-on-quit' is set. */); | |
db9f0278 | 2414 | |
29208e82 | 2415 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
fb7ada5f | 2416 | doc: /* Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
2417 | |
2418 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
2419 | actual stack overflow in C, which would be fatal for Emacs. |
2420 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
2421 | if that proves inconveniently small. However, if you increase it too far, |
2422 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 2423 | |
29208e82 | 2424 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 2425 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
2426 | If the value is t, that means do an ordinary quit. |
2427 | If the value equals `throw-on-input', that means quit by throwing | |
2428 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
2429 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
2430 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
2431 | Vquit_flag = Qnil; |
2432 | ||
29208e82 | 2433 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
2434 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
2435 | Note that `quit-flag' will still be set by typing C-g, | |
2436 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
2437 | To prevent this happening, set `quit-flag' to nil | |
2438 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
2439 | Vinhibit_quit = Qnil; |
2440 | ||
cd3520a4 JB |
2441 | DEFSYM (Qinhibit_quit, "inhibit-quit"); |
2442 | DEFSYM (Qautoload, "autoload"); | |
45b82ad0 | 2443 | DEFSYM (Qinhibit_debugger, "inhibit-debugger"); |
cd3520a4 JB |
2444 | DEFSYM (Qmacro, "macro"); |
2445 | DEFSYM (Qdeclare, "declare"); | |
177c0ea7 | 2446 | |
db9f0278 JB |
2447 | /* Note that the process handling also uses Qexit, but we don't want |
2448 | to staticpro it twice, so we just do it here. */ | |
cd3520a4 | 2449 | DEFSYM (Qexit, "exit"); |
b9598260 | 2450 | |
cd3520a4 JB |
2451 | DEFSYM (Qinteractive, "interactive"); |
2452 | DEFSYM (Qcommandp, "commandp"); | |
cd3520a4 JB |
2453 | DEFSYM (Qand_rest, "&rest"); |
2454 | DEFSYM (Qand_optional, "&optional"); | |
2455 | DEFSYM (Qclosure, "closure"); | |
2456 | DEFSYM (Qdebug, "debug"); | |
f01cbfdd | 2457 | |
45b82ad0 SM |
2458 | DEFVAR_LISP ("inhibit-debugger", Vinhibit_debugger, |
2459 | doc: /* Non-nil means never enter the debugger. | |
2460 | Normally set while the debugger is already active, to avoid recursive | |
2461 | invocations. */); | |
2462 | Vinhibit_debugger = Qnil; | |
2463 | ||
29208e82 | 2464 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
fb7ada5f | 2465 | doc: /* Non-nil means enter debugger if an error is signaled. |
9dbc9081 PJ |
2466 | Does not apply to errors handled by `condition-case' or those |
2467 | matched by `debug-ignored-errors'. | |
2468 | If the value is a list, an error only means to enter the debugger | |
2469 | if one of its condition symbols appears in the list. | |
2470 | When you evaluate an expression interactively, this variable | |
2471 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f | 2472 | The command `toggle-debug-on-error' toggles this. |
45b82ad0 | 2473 | See also the variable `debug-on-quit' and `inhibit-debugger'. */); |
128c0f66 | 2474 | Vdebug_on_error = Qnil; |
db9f0278 | 2475 | |
29208e82 | 2476 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
fb7ada5f | 2477 | doc: /* List of errors for which the debugger should not be called. |
9dbc9081 PJ |
2478 | Each element may be a condition-name or a regexp that matches error messages. |
2479 | If any element applies to a given error, that error skips the debugger | |
2480 | and just returns to top level. | |
2481 | This overrides the variable `debug-on-error'. | |
2482 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
2483 | Vdebug_ignored_errors = Qnil; |
2484 | ||
29208e82 | 2485 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
fb7ada5f | 2486 | doc: /* Non-nil means enter debugger if quit is signaled (C-g, for example). |
82fc29a1 | 2487 | Does not apply if quit is handled by a `condition-case'. */); |
db9f0278 JB |
2488 | debug_on_quit = 0; |
2489 | ||
29208e82 | 2490 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 2491 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 2492 | |
29208e82 | 2493 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
2494 | doc: /* Non-nil means debugger may continue execution. |
2495 | This is nil when the debugger is called under circumstances where it | |
2496 | might not be safe to continue. */); | |
dac204bc | 2497 | debugger_may_continue = 1; |
556d7314 | 2498 | |
29208e82 | 2499 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
2500 | doc: /* Function to call to invoke debugger. |
2501 | If due to frame exit, args are `exit' and the value being returned; | |
2502 | this function's value will be returned instead of that. | |
2503 | If due to error, args are `error' and a list of the args to `signal'. | |
2504 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
2505 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
2506 | Vdebugger = Qnil; |
2507 | ||
29208e82 | 2508 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
2509 | doc: /* If non-nil, this is a function for `signal' to call. |
2510 | It receives the same arguments that `signal' was given. | |
2511 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
2512 | Vsignal_hook_function = Qnil; |
2513 | ||
29208e82 | 2514 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
fb7ada5f | 2515 | doc: /* Non-nil means call the debugger regardless of condition handlers. |
9dbc9081 PJ |
2516 | Note that `debug-on-error', `debug-on-quit' and friends |
2517 | still determine whether to handle the particular condition. */); | |
57a6e758 | 2518 | Vdebug_on_signal = Qnil; |
61ede770 | 2519 | |
b38b1ec0 | 2520 | /* When lexical binding is being used, |
61b108cc | 2521 | Vinternal_interpreter_environment is non-nil, and contains an alist |
b38b1ec0 SM |
2522 | of lexically-bound variable, or (t), indicating an empty |
2523 | environment. The lisp name of this variable would be | |
2524 | `internal-interpreter-environment' if it weren't hidden. | |
2525 | Every element of this list can be either a cons (VAR . VAL) | |
2526 | specifying a lexical binding, or a single symbol VAR indicating | |
2527 | that this variable should use dynamic scoping. */ | |
61b108cc SM |
2528 | DEFSYM (Qinternal_interpreter_environment, |
2529 | "internal-interpreter-environment"); | |
b38b1ec0 SM |
2530 | DEFVAR_LISP ("internal-interpreter-environment", |
2531 | Vinternal_interpreter_environment, | |
b9598260 SM |
2532 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
2533 | When lexical binding is not being used, this variable is nil. | |
2534 | A value of `(t)' indicates an empty environment, otherwise it is an | |
2535 | alist of active lexical bindings. */); | |
2536 | Vinternal_interpreter_environment = Qnil; | |
c80e3b4a | 2537 | /* Don't export this variable to Elisp, so no one can mess with it |
b38b1ec0 | 2538 | (Just imagine if someone makes it buffer-local). */ |
1bf3ed7c | 2539 | //Funintern (Qinternal_interpreter_environment, Qnil); |
b9598260 | 2540 | |
cd3520a4 | 2541 | DEFSYM (Vrun_hooks, "run-hooks"); |
db9f0278 JB |
2542 | |
2543 | staticpro (&Vautoload_queue); | |
2544 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
2545 | staticpro (&Vsignaling_function); |
2546 | Vsignaling_function = Qnil; | |
db9f0278 | 2547 | |
d1f55f16 | 2548 | inhibit_lisp_code = Qnil; |
db9f0278 | 2549 | } |