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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
ab422c4d PE |
2 | Copyright (C) 1985-1987, 1993-1995, 1999-2013 Free Software |
3 | Foundation, Inc. | |
db9f0278 JB |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
9ec0b715 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
db9f0278 | 8 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
db9f0278 JB |
11 | |
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
db9f0278 JB |
19 | |
20 | ||
18160b98 | 21 | #include <config.h> |
eb3f1cc8 | 22 | #include <limits.h> |
4e2fe2e6 | 23 | #include <stdio.h> |
db9f0278 | 24 | #include "lisp.h" |
9ac0d9e0 | 25 | #include "blockinput.h" |
db9f0278 | 26 | #include "commands.h" |
1f98fa48 | 27 | #include "keyboard.h" |
3648c842 | 28 | #include "dispextern.h" |
94b612ad | 29 | #include "frame.h" /* For XFRAME. */ |
db9f0278 | 30 | |
b70e1a2b SM |
31 | #if HAVE_X_WINDOWS |
32 | #include "xterm.h" | |
33 | #endif | |
34 | ||
244ed907 PE |
35 | #if !BYTE_MARK_STACK |
36 | static | |
37 | #endif | |
db9f0278 JB |
38 | struct catchtag *catchlist; |
39 | ||
244ed907 PE |
40 | /* Chain of condition handlers currently in effect. |
41 | The elements of this chain are contained in the stack frames | |
42 | of Fcondition_case and internal_condition_case. | |
43 | When an error is signaled (by calling Fsignal, below), | |
44 | this chain is searched for an element that applies. */ | |
45 | ||
46 | #if !BYTE_MARK_STACK | |
47 | static | |
48 | #endif | |
49 | struct handler *handlerlist; | |
50 | ||
15934ffa RS |
51 | #ifdef DEBUG_GCPRO |
52 | /* Count levels of GCPRO to detect failure to UNGCPRO. */ | |
53 | int gcpro_level; | |
54 | #endif | |
55 | ||
61b108cc | 56 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp; |
29208e82 | 57 | Lisp_Object Qinhibit_quit; |
955cbe7b PE |
58 | Lisp_Object Qand_rest; |
59 | static Lisp_Object Qand_optional; | |
45b82ad0 | 60 | static Lisp_Object Qinhibit_debugger; |
955cbe7b | 61 | static Lisp_Object Qdeclare; |
b9598260 SM |
62 | Lisp_Object Qinternal_interpreter_environment, Qclosure; |
63 | ||
ed008a6d | 64 | static Lisp_Object Qdebug; |
db9f0278 | 65 | |
6e6e9f08 RS |
66 | /* This holds either the symbol `run-hooks' or nil. |
67 | It is nil at an early stage of startup, and when Emacs | |
68 | is shutting down. */ | |
4c576a83 | 69 | |
db9f0278 JB |
70 | Lisp_Object Vrun_hooks; |
71 | ||
72 | /* Non-nil means record all fset's and provide's, to be undone | |
73 | if the file being autoloaded is not fully loaded. | |
74 | They are recorded by being consed onto the front of Vautoload_queue: | |
47b82df9 | 75 | (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */ |
db9f0278 JB |
76 | |
77 | Lisp_Object Vautoload_queue; | |
78 | ||
9349e5f7 PE |
79 | /* Current number of specbindings allocated in specpdl, not counting |
80 | the dummy entry specpdl[-1]. */ | |
4c576a83 | 81 | |
d311d28c | 82 | ptrdiff_t specpdl_size; |
db9f0278 | 83 | |
9349e5f7 PE |
84 | /* Pointer to beginning of specpdl. A dummy entry specpdl[-1] exists |
85 | only so that its address can be taken. */ | |
4c576a83 | 86 | |
9349e5f7 | 87 | union specbinding *specpdl; |
db9f0278 JB |
88 | |
89 | /* Pointer to first unused element in specpdl. */ | |
4c576a83 | 90 | |
9349e5f7 | 91 | union specbinding *specpdl_ptr; |
db9f0278 | 92 | |
db9f0278 | 93 | /* Depth in Lisp evaluations and function calls. */ |
4c576a83 | 94 | |
57a96f5c | 95 | static EMACS_INT lisp_eval_depth; |
db9f0278 | 96 | |
be857679 | 97 | /* The value of num_nonmacro_input_events as of the last time we |
82da7701 | 98 | started to enter the debugger. If we decide to enter the debugger |
be857679 | 99 | again when this is still equal to num_nonmacro_input_events, then we |
82da7701 JB |
100 | know that the debugger itself has an error, and we should just |
101 | signal the error instead of entering an infinite loop of debugger | |
102 | invocations. */ | |
4c576a83 | 103 | |
d311d28c | 104 | static EMACS_INT when_entered_debugger; |
db9f0278 | 105 | |
a2ff3819 GM |
106 | /* The function from which the last `signal' was called. Set in |
107 | Fsignal. */ | |
2f592f95 | 108 | /* FIXME: We should probably get rid of this! */ |
a2ff3819 GM |
109 | Lisp_Object Vsignaling_function; |
110 | ||
d1f55f16 CY |
111 | /* If non-nil, Lisp code must not be run since some part of Emacs is |
112 | in an inconsistent state. Currently, x-create-frame uses this to | |
113 | avoid triggering window-configuration-change-hook while the new | |
114 | frame is half-initialized. */ | |
115 | Lisp_Object inhibit_lisp_code; | |
116 | ||
9c203066 PE |
117 | /* These would ordinarily be static, but they need to be visible to GDB. */ |
118 | bool backtrace_p (union specbinding *) EXTERNALLY_VISIBLE; | |
119 | Lisp_Object *backtrace_args (union specbinding *) EXTERNALLY_VISIBLE; | |
120 | Lisp_Object backtrace_function (union specbinding *) EXTERNALLY_VISIBLE; | |
121 | union specbinding *backtrace_next (union specbinding *) EXTERNALLY_VISIBLE; | |
122 | union specbinding *backtrace_top (void) EXTERNALLY_VISIBLE; | |
123 | ||
f66c7cf8 | 124 | static Lisp_Object funcall_lambda (Lisp_Object, ptrdiff_t, Lisp_Object *); |
7200d79c | 125 | static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args); |
e46f2325 | 126 | |
84575e67 | 127 | static Lisp_Object |
9349e5f7 | 128 | specpdl_symbol (union specbinding *pdl) |
84575e67 PE |
129 | { |
130 | eassert (pdl->kind >= SPECPDL_LET); | |
9349e5f7 | 131 | return pdl->let.symbol; |
84575e67 PE |
132 | } |
133 | ||
134 | static Lisp_Object | |
9349e5f7 | 135 | specpdl_old_value (union specbinding *pdl) |
84575e67 PE |
136 | { |
137 | eassert (pdl->kind >= SPECPDL_LET); | |
9349e5f7 | 138 | return pdl->let.old_value; |
84575e67 PE |
139 | } |
140 | ||
56ea7291 SM |
141 | static void |
142 | set_specpdl_old_value (union specbinding *pdl, Lisp_Object val) | |
143 | { | |
144 | eassert (pdl->kind >= SPECPDL_LET); | |
145 | pdl->let.old_value = val; | |
146 | } | |
147 | ||
84575e67 | 148 | static Lisp_Object |
9349e5f7 | 149 | specpdl_where (union specbinding *pdl) |
84575e67 PE |
150 | { |
151 | eassert (pdl->kind > SPECPDL_LET); | |
9349e5f7 | 152 | return pdl->let.where; |
84575e67 PE |
153 | } |
154 | ||
155 | static Lisp_Object | |
9349e5f7 | 156 | specpdl_arg (union specbinding *pdl) |
84575e67 PE |
157 | { |
158 | eassert (pdl->kind == SPECPDL_UNWIND); | |
9349e5f7 | 159 | return pdl->unwind.arg; |
84575e67 PE |
160 | } |
161 | ||
9c203066 | 162 | Lisp_Object |
9349e5f7 | 163 | backtrace_function (union specbinding *pdl) |
84575e67 PE |
164 | { |
165 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 166 | return pdl->bt.function; |
84575e67 PE |
167 | } |
168 | ||
169 | static ptrdiff_t | |
9349e5f7 | 170 | backtrace_nargs (union specbinding *pdl) |
84575e67 PE |
171 | { |
172 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 173 | return pdl->bt.nargs; |
84575e67 PE |
174 | } |
175 | ||
9c203066 | 176 | Lisp_Object * |
9349e5f7 | 177 | backtrace_args (union specbinding *pdl) |
84575e67 PE |
178 | { |
179 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 180 | return pdl->bt.args; |
84575e67 PE |
181 | } |
182 | ||
183 | static bool | |
9349e5f7 | 184 | backtrace_debug_on_exit (union specbinding *pdl) |
84575e67 PE |
185 | { |
186 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
9349e5f7 | 187 | return pdl->bt.debug_on_exit; |
84575e67 PE |
188 | } |
189 | ||
2f592f95 | 190 | /* Functions to modify slots of backtrace records. */ |
e46f2325 | 191 | |
3d5ee10a | 192 | static void |
9349e5f7 PE |
193 | set_backtrace_args (union specbinding *pdl, Lisp_Object *args) |
194 | { | |
195 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
196 | pdl->bt.args = args; | |
197 | } | |
2f592f95 | 198 | |
3d5ee10a | 199 | static void |
9349e5f7 PE |
200 | set_backtrace_nargs (union specbinding *pdl, ptrdiff_t n) |
201 | { | |
202 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
203 | pdl->bt.nargs = n; | |
204 | } | |
2f592f95 | 205 | |
3d5ee10a | 206 | static void |
9349e5f7 PE |
207 | set_backtrace_debug_on_exit (union specbinding *pdl, bool doe) |
208 | { | |
209 | eassert (pdl->kind == SPECPDL_BACKTRACE); | |
210 | pdl->bt.debug_on_exit = doe; | |
211 | } | |
2f592f95 SM |
212 | |
213 | /* Helper functions to scan the backtrace. */ | |
214 | ||
9349e5f7 PE |
215 | bool |
216 | backtrace_p (union specbinding *pdl) | |
2f592f95 | 217 | { return pdl >= specpdl; } |
a8a7c5f6 | 218 | |
9349e5f7 | 219 | union specbinding * |
3d5ee10a | 220 | backtrace_top (void) |
e46f2325 | 221 | { |
9349e5f7 | 222 | union specbinding *pdl = specpdl_ptr - 1; |
a8a7c5f6 | 223 | while (backtrace_p (pdl) && pdl->kind != SPECPDL_BACKTRACE) |
2f592f95 SM |
224 | pdl--; |
225 | return pdl; | |
e46f2325 | 226 | } |
a8a7c5f6 | 227 | |
9349e5f7 PE |
228 | union specbinding * |
229 | backtrace_next (union specbinding *pdl) | |
e46f2325 | 230 | { |
2f592f95 SM |
231 | pdl--; |
232 | while (backtrace_p (pdl) && pdl->kind != SPECPDL_BACKTRACE) | |
233 | pdl--; | |
234 | return pdl; | |
e46f2325 DA |
235 | } |
236 | ||
2f592f95 | 237 | |
dfcf069d | 238 | void |
d3da34e0 | 239 | init_eval_once (void) |
db9f0278 | 240 | { |
98e8eae1 | 241 | enum { size = 50 }; |
9349e5f7 | 242 | union specbinding *pdlvec = xmalloc ((size + 1) * sizeof *specpdl); |
98e8eae1 | 243 | specpdl_size = size; |
9349e5f7 | 244 | specpdl = specpdl_ptr = pdlvec + 1; |
6588243d | 245 | /* Don't forget to update docs (lispref node "Local Variables"). */ |
c530e1c2 | 246 | max_specpdl_size = 1300; /* 1000 is not enough for CEDET's c-by.el. */ |
d46f6bbb | 247 | max_lisp_eval_depth = 600; |
34d470ba RS |
248 | |
249 | Vrun_hooks = Qnil; | |
db9f0278 JB |
250 | } |
251 | ||
dfcf069d | 252 | void |
d3da34e0 | 253 | init_eval (void) |
db9f0278 JB |
254 | { |
255 | specpdl_ptr = specpdl; | |
256 | catchlist = 0; | |
257 | handlerlist = 0; | |
db9f0278 JB |
258 | Vquit_flag = Qnil; |
259 | debug_on_next_call = 0; | |
260 | lisp_eval_depth = 0; | |
87e21fbd | 261 | #ifdef DEBUG_GCPRO |
15934ffa | 262 | gcpro_level = 0; |
87e21fbd | 263 | #endif |
be857679 | 264 | /* This is less than the initial value of num_nonmacro_input_events. */ |
b5b911f9 | 265 | when_entered_debugger = -1; |
db9f0278 JB |
266 | } |
267 | ||
f6d62986 | 268 | /* Unwind-protect function used by call_debugger. */ |
9f5903bb | 269 | |
27e498e6 | 270 | static void |
d3da34e0 | 271 | restore_stack_limits (Lisp_Object data) |
9f5903bb RS |
272 | { |
273 | max_specpdl_size = XINT (XCAR (data)); | |
274 | max_lisp_eval_depth = XINT (XCDR (data)); | |
275 | } | |
276 | ||
277 | /* Call the Lisp debugger, giving it argument ARG. */ | |
278 | ||
7f7e0167 | 279 | Lisp_Object |
d3da34e0 | 280 | call_debugger (Lisp_Object arg) |
db9f0278 | 281 | { |
1882aa38 | 282 | bool debug_while_redisplaying; |
d311d28c | 283 | ptrdiff_t count = SPECPDL_INDEX (); |
3648c842 | 284 | Lisp_Object val; |
5816888b | 285 | EMACS_INT old_max = max_specpdl_size; |
177c0ea7 | 286 | |
9f5903bb RS |
287 | /* Temporarily bump up the stack limits, |
288 | so the debugger won't run out of stack. */ | |
177c0ea7 | 289 | |
9f5903bb RS |
290 | max_specpdl_size += 1; |
291 | record_unwind_protect (restore_stack_limits, | |
292 | Fcons (make_number (old_max), | |
293 | make_number (max_lisp_eval_depth))); | |
294 | max_specpdl_size = old_max; | |
295 | ||
296 | if (lisp_eval_depth + 40 > max_lisp_eval_depth) | |
297 | max_lisp_eval_depth = lisp_eval_depth + 40; | |
298 | ||
98e8eae1 | 299 | if (max_specpdl_size - 100 < SPECPDL_INDEX ()) |
9f5903bb | 300 | max_specpdl_size = SPECPDL_INDEX () + 100; |
177c0ea7 | 301 | |
d148e14d | 302 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
303 | if (display_hourglass_p) |
304 | cancel_hourglass (); | |
237c23b0 GM |
305 | #endif |
306 | ||
db9f0278 | 307 | debug_on_next_call = 0; |
be857679 | 308 | when_entered_debugger = num_nonmacro_input_events; |
3648c842 GM |
309 | |
310 | /* Resetting redisplaying_p to 0 makes sure that debug output is | |
311 | displayed if the debugger is invoked during redisplay. */ | |
312 | debug_while_redisplaying = redisplaying_p; | |
313 | redisplaying_p = 0; | |
556d7314 GM |
314 | specbind (intern ("debugger-may-continue"), |
315 | debug_while_redisplaying ? Qnil : Qt); | |
8efb6cc7 | 316 | specbind (Qinhibit_redisplay, Qnil); |
45b82ad0 | 317 | specbind (Qinhibit_debugger, Qt); |
9db6f6b4 GM |
318 | |
319 | #if 0 /* Binding this prevents execution of Lisp code during | |
320 | redisplay, which necessarily leads to display problems. */ | |
8efb6cc7 | 321 | specbind (Qinhibit_eval_during_redisplay, Qt); |
9db6f6b4 | 322 | #endif |
177c0ea7 | 323 | |
3648c842 GM |
324 | val = apply1 (Vdebugger, arg); |
325 | ||
326 | /* Interrupting redisplay and resuming it later is not safe under | |
327 | all circumstances. So, when the debugger returns, abort the | |
1b1acc13 | 328 | interrupted redisplay by going back to the top-level. */ |
3648c842 GM |
329 | if (debug_while_redisplaying) |
330 | Ftop_level (); | |
331 | ||
556d7314 | 332 | return unbind_to (count, val); |
db9f0278 JB |
333 | } |
334 | ||
475545b5 | 335 | static void |
d3da34e0 | 336 | do_debug_on_call (Lisp_Object code) |
db9f0278 JB |
337 | { |
338 | debug_on_next_call = 0; | |
2f592f95 | 339 | set_backtrace_debug_on_exit (specpdl_ptr - 1, true); |
6c6f1994 | 340 | call_debugger (list1 (code)); |
db9f0278 JB |
341 | } |
342 | \f | |
343 | /* NOTE!!! Every function that can call EVAL must protect its args | |
344 | and temporaries from garbage collection while it needs them. | |
345 | The definition of `For' shows what you have to do. */ | |
346 | ||
347 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
348 | doc: /* Eval args until one of them yields non-nil, then return that value. |
349 | The remaining args are not evalled at all. | |
350 | If all args return nil, return nil. | |
533eb34b | 351 | usage: (or CONDITIONS...) */) |
5842a27b | 352 | (Lisp_Object args) |
db9f0278 | 353 | { |
e509f168 | 354 | register Lisp_Object val = Qnil; |
db9f0278 JB |
355 | struct gcpro gcpro1; |
356 | ||
e509f168 | 357 | GCPRO1 (args); |
db9f0278 | 358 | |
e509f168 | 359 | while (CONSP (args)) |
db9f0278 | 360 | { |
defb1411 | 361 | val = eval_sub (XCAR (args)); |
265a9e55 | 362 | if (!NILP (val)) |
db9f0278 | 363 | break; |
e509f168 | 364 | args = XCDR (args); |
db9f0278 | 365 | } |
db9f0278 JB |
366 | |
367 | UNGCPRO; | |
368 | return val; | |
369 | } | |
370 | ||
371 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
b8de5714 | 372 | doc: /* Eval args until one of them yields nil, then return nil. |
9dbc9081 PJ |
373 | The remaining args are not evalled at all. |
374 | If no arg yields nil, return the last arg's value. | |
533eb34b | 375 | usage: (and CONDITIONS...) */) |
5842a27b | 376 | (Lisp_Object args) |
db9f0278 | 377 | { |
e509f168 | 378 | register Lisp_Object val = Qt; |
db9f0278 JB |
379 | struct gcpro gcpro1; |
380 | ||
e509f168 | 381 | GCPRO1 (args); |
db9f0278 | 382 | |
e509f168 | 383 | while (CONSP (args)) |
db9f0278 | 384 | { |
defb1411 | 385 | val = eval_sub (XCAR (args)); |
265a9e55 | 386 | if (NILP (val)) |
db9f0278 | 387 | break; |
e509f168 | 388 | args = XCDR (args); |
db9f0278 | 389 | } |
db9f0278 JB |
390 | |
391 | UNGCPRO; | |
392 | return val; | |
393 | } | |
394 | ||
395 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
b8de5714 | 396 | doc: /* If COND yields non-nil, do THEN, else do ELSE... |
9dbc9081 PJ |
397 | Returns the value of THEN or the value of the last of the ELSE's. |
398 | THEN must be one expression, but ELSE... can be zero or more expressions. | |
399 | If COND yields nil, and there are no ELSE's, the value is nil. | |
7a25dc6d | 400 | usage: (if COND THEN ELSE...) */) |
5842a27b | 401 | (Lisp_Object args) |
db9f0278 | 402 | { |
16b0520a | 403 | Lisp_Object cond; |
db9f0278 JB |
404 | struct gcpro gcpro1; |
405 | ||
406 | GCPRO1 (args); | |
16b0520a | 407 | cond = eval_sub (XCAR (args)); |
db9f0278 JB |
408 | UNGCPRO; |
409 | ||
265a9e55 | 410 | if (!NILP (cond)) |
16b0520a PE |
411 | return eval_sub (Fcar (XCDR (args))); |
412 | return Fprogn (XCDR (XCDR (args))); | |
db9f0278 JB |
413 | } |
414 | ||
415 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
416 | doc: /* Try each clause until one succeeds. |
417 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated | |
418 | and, if the value is non-nil, this clause succeeds: | |
419 | then the expressions in BODY are evaluated and the last one's | |
420 | value is the value of the cond-form. | |
421 | If no clause succeeds, cond returns nil. | |
422 | If a clause has one element, as in (CONDITION), | |
423 | CONDITION's value if non-nil is returned from the cond-form. | |
7a25dc6d | 424 | usage: (cond CLAUSES...) */) |
5842a27b | 425 | (Lisp_Object args) |
db9f0278 | 426 | { |
16b0520a | 427 | Lisp_Object val = args; |
db9f0278 JB |
428 | struct gcpro gcpro1; |
429 | ||
db9f0278 | 430 | GCPRO1 (args); |
16b0520a | 431 | while (CONSP (args)) |
db9f0278 | 432 | { |
16b0520a | 433 | Lisp_Object clause = XCAR (args); |
defb1411 | 434 | val = eval_sub (Fcar (clause)); |
265a9e55 | 435 | if (!NILP (val)) |
db9f0278 | 436 | { |
16b0520a | 437 | if (!NILP (XCDR (clause))) |
03699b14 | 438 | val = Fprogn (XCDR (clause)); |
db9f0278 JB |
439 | break; |
440 | } | |
03699b14 | 441 | args = XCDR (args); |
db9f0278 JB |
442 | } |
443 | UNGCPRO; | |
444 | ||
445 | return val; | |
446 | } | |
447 | ||
a7ca3326 | 448 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, |
9dbc9081 | 449 | doc: /* Eval BODY forms sequentially and return value of last one. |
5b4a1f50 | 450 | usage: (progn BODY...) */) |
27e498e6 | 451 | (Lisp_Object body) |
db9f0278 | 452 | { |
27e498e6 | 453 | Lisp_Object val = Qnil; |
db9f0278 JB |
454 | struct gcpro gcpro1; |
455 | ||
27e498e6 | 456 | GCPRO1 (body); |
db9f0278 | 457 | |
27e498e6 | 458 | while (CONSP (body)) |
db9f0278 | 459 | { |
27e498e6 PE |
460 | val = eval_sub (XCAR (body)); |
461 | body = XCDR (body); | |
db9f0278 | 462 | } |
db9f0278 JB |
463 | |
464 | UNGCPRO; | |
465 | return val; | |
466 | } | |
467 | ||
02c66599 | 468 | /* Evaluate BODY sequentially, discarding its value. Suitable for |
27e498e6 PE |
469 | record_unwind_protect. */ |
470 | ||
471 | void | |
472 | unwind_body (Lisp_Object body) | |
473 | { | |
474 | Fprogn (body); | |
475 | } | |
476 | ||
db9f0278 | 477 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, |
bdee2ef3 | 478 | doc: /* Eval FIRST and BODY sequentially; return value from FIRST. |
9dbc9081 PJ |
479 | The value of FIRST is saved during the evaluation of the remaining args, |
480 | whose values are discarded. | |
7a25dc6d | 481 | usage: (prog1 FIRST BODY...) */) |
5842a27b | 482 | (Lisp_Object args) |
db9f0278 JB |
483 | { |
484 | Lisp_Object val; | |
16b0520a | 485 | Lisp_Object args_left; |
db9f0278 | 486 | struct gcpro gcpro1, gcpro2; |
db9f0278 JB |
487 | |
488 | args_left = args; | |
16b0520a | 489 | val = args; |
db9f0278 JB |
490 | GCPRO2 (args, val); |
491 | ||
856bbc81 PE |
492 | val = eval_sub (XCAR (args_left)); |
493 | while (CONSP (args_left = XCDR (args_left))) | |
494 | eval_sub (XCAR (args_left)); | |
db9f0278 JB |
495 | |
496 | UNGCPRO; | |
497 | return val; | |
498 | } | |
499 | ||
500 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
bdee2ef3 | 501 | doc: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2. |
82fc29a1 JB |
502 | The value of FORM2 is saved during the evaluation of the |
503 | remaining args, whose values are discarded. | |
504 | usage: (prog2 FORM1 FORM2 BODY...) */) | |
5842a27b | 505 | (Lisp_Object args) |
db9f0278 | 506 | { |
856bbc81 | 507 | struct gcpro gcpro1; |
db9f0278 | 508 | |
856bbc81 | 509 | GCPRO1 (args); |
856bbc81 | 510 | eval_sub (XCAR (args)); |
a63df926 PE |
511 | UNGCPRO; |
512 | return Fprog1 (XCDR (args)); | |
db9f0278 JB |
513 | } |
514 | ||
515 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
9dbc9081 PJ |
516 | doc: /* Set each SYM to the value of its VAL. |
517 | The symbols SYM are variables; they are literal (not evaluated). | |
518 | The values VAL are expressions; they are evaluated. | |
519 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'. | |
520 | The second VAL is not computed until after the first SYM is set, and so on; | |
521 | each VAL can use the new value of variables set earlier in the `setq'. | |
522 | The return value of the `setq' form is the value of the last VAL. | |
819586b2 | 523 | usage: (setq [SYM VAL]...) */) |
5842a27b | 524 | (Lisp_Object args) |
db9f0278 | 525 | { |
16b0520a | 526 | Lisp_Object val, sym, lex_binding; |
db9f0278 | 527 | |
16b0520a PE |
528 | val = args; |
529 | if (CONSP (args)) | |
530 | { | |
531 | Lisp_Object args_left = args; | |
532 | struct gcpro gcpro1; | |
533 | GCPRO1 (args); | |
db9f0278 | 534 | |
16b0520a PE |
535 | do |
536 | { | |
537 | val = eval_sub (Fcar (XCDR (args_left))); | |
538 | sym = XCAR (args_left); | |
539 | ||
540 | /* Like for eval_sub, we do not check declared_special here since | |
541 | it's been done when let-binding. */ | |
542 | if (!NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
543 | && SYMBOLP (sym) | |
544 | && !NILP (lex_binding | |
545 | = Fassq (sym, Vinternal_interpreter_environment))) | |
546 | XSETCDR (lex_binding, val); /* SYM is lexically bound. */ | |
547 | else | |
548 | Fset (sym, val); /* SYM is dynamically bound. */ | |
db9f0278 | 549 | |
16b0520a PE |
550 | args_left = Fcdr (XCDR (args_left)); |
551 | } | |
552 | while (CONSP (args_left)); | |
b9598260 | 553 | |
16b0520a | 554 | UNGCPRO; |
db9f0278 | 555 | } |
db9f0278 | 556 | |
db9f0278 JB |
557 | return val; |
558 | } | |
177c0ea7 | 559 | |
db9f0278 | 560 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, |
9dbc9081 | 561 | doc: /* Return the argument, without evaluating it. `(quote x)' yields `x'. |
91a15bc6 SM |
562 | Warning: `quote' does not construct its return value, but just returns |
563 | the value that was pre-constructed by the Lisp reader (see info node | |
564 | `(elisp)Printed Representation'). | |
565 | This means that '(a . b) is not identical to (cons 'a 'b): the former | |
566 | does not cons. Quoting should be reserved for constants that will | |
567 | never be modified by side-effects, unless you like self-modifying code. | |
568 | See the common pitfall in info node `(elisp)Rearrangement' for an example | |
569 | of unexpected results when a quoted object is modified. | |
9dbc9081 | 570 | usage: (quote ARG) */) |
5842a27b | 571 | (Lisp_Object args) |
db9f0278 | 572 | { |
16b0520a | 573 | if (CONSP (XCDR (args))) |
1283140e | 574 | xsignal2 (Qwrong_number_of_arguments, Qquote, Flength (args)); |
16b0520a | 575 | return XCAR (args); |
db9f0278 | 576 | } |
177c0ea7 | 577 | |
db9f0278 | 578 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, |
9dbc9081 PJ |
579 | doc: /* Like `quote', but preferred for objects which are functions. |
580 | In byte compilation, `function' causes its argument to be compiled. | |
581 | `quote' cannot do that. | |
582 | usage: (function ARG) */) | |
5842a27b | 583 | (Lisp_Object args) |
db9f0278 | 584 | { |
b9598260 SM |
585 | Lisp_Object quoted = XCAR (args); |
586 | ||
16b0520a | 587 | if (CONSP (XCDR (args))) |
1283140e | 588 | xsignal2 (Qwrong_number_of_arguments, Qfunction, Flength (args)); |
b9598260 SM |
589 | |
590 | if (!NILP (Vinternal_interpreter_environment) | |
591 | && CONSP (quoted) | |
592 | && EQ (XCAR (quoted), Qlambda)) | |
593 | /* This is a lambda expression within a lexical environment; | |
594 | return an interpreted closure instead of a simple lambda. */ | |
23aba0ea SM |
595 | return Fcons (Qclosure, Fcons (Vinternal_interpreter_environment, |
596 | XCDR (quoted))); | |
b9598260 SM |
597 | else |
598 | /* Simply quote the argument. */ | |
599 | return quoted; | |
db9f0278 JB |
600 | } |
601 | ||
e0f331ab | 602 | |
1848d15d | 603 | DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0, |
4a9308b8 | 604 | doc: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE. |
e102f0d8 | 605 | Aliased variables always have the same value; setting one sets the other. |
4a9308b8 | 606 | Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is |
dd60787c GM |
607 | omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE, |
608 | or of the variable at the end of the chain of aliases, if BASE-VARIABLE is | |
609 | itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not, | |
610 | then the value of BASE-VARIABLE is set to that of NEW-ALIAS. | |
4a9308b8 | 611 | The return value is BASE-VARIABLE. */) |
5842a27b | 612 | (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring) |
19cebf5a GM |
613 | { |
614 | struct Lisp_Symbol *sym; | |
1848d15d | 615 | |
4a9308b8 JB |
616 | CHECK_SYMBOL (new_alias); |
617 | CHECK_SYMBOL (base_variable); | |
19cebf5a | 618 | |
4a9308b8 | 619 | sym = XSYMBOL (new_alias); |
ce5b453a SM |
620 | |
621 | if (sym->constant) | |
178f2507 SM |
622 | /* Not sure why, but why not? */ |
623 | error ("Cannot make a constant an alias"); | |
ce5b453a SM |
624 | |
625 | switch (sym->redirect) | |
626 | { | |
627 | case SYMBOL_FORWARDED: | |
628 | error ("Cannot make an internal variable an alias"); | |
629 | case SYMBOL_LOCALIZED: | |
630 | error ("Don't know how to make a localized variable an alias"); | |
631 | } | |
632 | ||
dd60787c | 633 | /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html |
ce5b453a SM |
634 | If n_a is bound, but b_v is not, set the value of b_v to n_a, |
635 | so that old-code that affects n_a before the aliasing is setup | |
636 | still works. */ | |
637 | if (NILP (Fboundp (base_variable))) | |
94b612ad | 638 | set_internal (base_variable, find_symbol_value (new_alias), Qnil, 1); |
ce5b453a SM |
639 | |
640 | { | |
9349e5f7 | 641 | union specbinding *p; |
ce5b453a | 642 | |
bc985141 | 643 | for (p = specpdl_ptr; p > specpdl; ) |
2f592f95 SM |
644 | if ((--p)->kind >= SPECPDL_LET |
645 | && (EQ (new_alias, specpdl_symbol (p)))) | |
ce5b453a SM |
646 | error ("Don't know how to make a let-bound variable an alias"); |
647 | } | |
648 | ||
b9598260 | 649 | sym->declared_special = 1; |
0ac30604 | 650 | XSYMBOL (base_variable)->declared_special = 1; |
ce5b453a SM |
651 | sym->redirect = SYMBOL_VARALIAS; |
652 | SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable)); | |
4a9308b8 JB |
653 | sym->constant = SYMBOL_CONSTANT_P (base_variable); |
654 | LOADHIST_ATTACH (new_alias); | |
ce5b453a SM |
655 | /* Even if docstring is nil: remove old docstring. */ |
656 | Fput (new_alias, Qvariable_documentation, docstring); | |
1848d15d | 657 | |
4a9308b8 | 658 | return base_variable; |
19cebf5a GM |
659 | } |
660 | ||
a104f656 SM |
661 | static union specbinding * |
662 | default_toplevel_binding (Lisp_Object symbol) | |
663 | { | |
664 | union specbinding *binding = NULL; | |
665 | union specbinding *pdl = specpdl_ptr; | |
666 | while (pdl > specpdl) | |
667 | { | |
668 | switch ((--pdl)->kind) | |
669 | { | |
670 | case SPECPDL_LET_DEFAULT: | |
671 | case SPECPDL_LET: | |
672 | if (EQ (specpdl_symbol (pdl), symbol)) | |
673 | binding = pdl; | |
674 | break; | |
675 | } | |
676 | } | |
677 | return binding; | |
678 | } | |
679 | ||
680 | DEFUN ("default-toplevel-value", Fdefault_toplevel_value, Sdefault_toplevel_value, 1, 1, 0, | |
681 | doc: /* Return SYMBOL's toplevel default value. | |
682 | "Toplevel" means outside of any let binding. */) | |
683 | (Lisp_Object symbol) | |
684 | { | |
685 | union specbinding *binding = default_toplevel_binding (symbol); | |
686 | Lisp_Object value | |
687 | = binding ? specpdl_old_value (binding) : Fdefault_value (symbol); | |
688 | if (!EQ (value, Qunbound)) | |
689 | return value; | |
690 | xsignal1 (Qvoid_variable, symbol); | |
691 | } | |
692 | ||
693 | DEFUN ("set-default-toplevel-value", Fset_default_toplevel_value, | |
694 | Sset_default_toplevel_value, 2, 2, 0, | |
695 | doc: /* Set SYMBOL's toplevel default value to VALUE. | |
696 | "Toplevel" means outside of any let binding. */) | |
697 | (Lisp_Object symbol, Lisp_Object value) | |
698 | { | |
699 | union specbinding *binding = default_toplevel_binding (symbol); | |
700 | if (binding) | |
701 | set_specpdl_old_value (binding, value); | |
702 | else | |
703 | Fset_default (symbol, value); | |
704 | return Qnil; | |
705 | } | |
19cebf5a | 706 | |
db9f0278 | 707 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, |
29357847 | 708 | doc: /* Define SYMBOL as a variable, and return SYMBOL. |
c3a70e2b CY |
709 | You are not required to define a variable in order to use it, but |
710 | defining it lets you supply an initial value and documentation, which | |
711 | can be referred to by the Emacs help facilities and other programming | |
712 | tools. The `defvar' form also declares the variable as \"special\", | |
713 | so that it is always dynamically bound even if `lexical-binding' is t. | |
714 | ||
715 | The optional argument INITVALUE is evaluated, and used to set SYMBOL, | |
716 | only if SYMBOL's value is void. If SYMBOL is buffer-local, its | |
717 | default value is what is set; buffer-local values are not affected. | |
9dbc9081 | 718 | If INITVALUE is missing, SYMBOL's value is not set. |
733f68b6 LT |
719 | |
720 | If SYMBOL has a local binding, then this form affects the local | |
721 | binding. This is usually not what you want. Thus, if you need to | |
722 | load a file defining variables, with this form or with `defconst' or | |
723 | `defcustom', you should always load that file _outside_ any bindings | |
724 | for these variables. \(`defconst' and `defcustom' behave similarly in | |
725 | this respect.) | |
c3a70e2b CY |
726 | |
727 | The optional argument DOCSTRING is a documentation string for the | |
728 | variable. | |
729 | ||
730 | To define a user option, use `defcustom' instead of `defvar'. | |
2df5238c | 731 | usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */) |
5842a27b | 732 | (Lisp_Object args) |
db9f0278 | 733 | { |
16b0520a | 734 | Lisp_Object sym, tem, tail; |
db9f0278 | 735 | |
16b0520a PE |
736 | sym = XCAR (args); |
737 | tail = XCDR (args); | |
a42ba017 | 738 | |
16b0520a | 739 | if (CONSP (tail)) |
db9f0278 | 740 | { |
16b0520a PE |
741 | if (CONSP (XCDR (tail)) && CONSP (XCDR (XCDR (tail)))) |
742 | error ("Too many arguments"); | |
743 | ||
744 | tem = Fdefault_boundp (sym); | |
745 | ||
ba83908c SM |
746 | /* Do it before evaluating the initial value, for self-references. */ |
747 | XSYMBOL (sym)->declared_special = 1; | |
590130fb | 748 | |
265a9e55 | 749 | if (NILP (tem)) |
16b0520a | 750 | Fset_default (sym, eval_sub (XCAR (tail))); |
d0bce91e SM |
751 | else |
752 | { /* Check if there is really a global binding rather than just a let | |
753 | binding that shadows the global unboundness of the var. */ | |
a104f656 SM |
754 | union specbinding *binding = default_toplevel_binding (sym); |
755 | if (binding && EQ (specpdl_old_value (binding), Qunbound)) | |
d0bce91e | 756 | { |
a104f656 | 757 | set_specpdl_old_value (binding, eval_sub (XCAR (tail))); |
d0bce91e SM |
758 | } |
759 | } | |
16b0520a | 760 | tail = XCDR (tail); |
e509f168 SM |
761 | tem = Fcar (tail); |
762 | if (!NILP (tem)) | |
33568849 | 763 | { |
33568849 SM |
764 | if (!NILP (Vpurify_flag)) |
765 | tem = Fpurecopy (tem); | |
766 | Fput (sym, Qvariable_documentation, tem); | |
767 | } | |
6fd797f5 | 768 | LOADHIST_ATTACH (sym); |
db9f0278 | 769 | } |
f07a954e SM |
770 | else if (!NILP (Vinternal_interpreter_environment) |
771 | && !XSYMBOL (sym)->declared_special) | |
772 | /* A simple (defvar foo) with lexical scoping does "nothing" except | |
773 | declare that var to be dynamically scoped *locally* (i.e. within | |
774 | the current file or let-block). */ | |
23ba2705 SM |
775 | Vinternal_interpreter_environment |
776 | = Fcons (sym, Vinternal_interpreter_environment); | |
33568849 | 777 | else |
d28a2170 PE |
778 | { |
779 | /* Simple (defvar <var>) should not count as a definition at all. | |
780 | It could get in the way of other definitions, and unloading this | |
781 | package could try to make the variable unbound. */ | |
782 | } | |
addf35fd | 783 | |
db9f0278 JB |
784 | return sym; |
785 | } | |
786 | ||
787 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
9dbc9081 | 788 | doc: /* Define SYMBOL as a constant variable. |
c3a70e2b CY |
789 | This declares that neither programs nor users should ever change the |
790 | value. This constancy is not actually enforced by Emacs Lisp, but | |
791 | SYMBOL is marked as a special variable so that it is never lexically | |
792 | bound. | |
793 | ||
794 | The `defconst' form always sets the value of SYMBOL to the result of | |
795 | evalling INITVALUE. If SYMBOL is buffer-local, its default value is | |
796 | what is set; buffer-local values are not affected. If SYMBOL has a | |
797 | local binding, then this form sets the local binding's value. | |
798 | However, you should normally not make local bindings for variables | |
799 | defined with this form. | |
800 | ||
801 | The optional DOCSTRING specifies the variable's documentation string. | |
7a25dc6d | 802 | usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */) |
5842a27b | 803 | (Lisp_Object args) |
db9f0278 | 804 | { |
16b0520a | 805 | Lisp_Object sym, tem; |
db9f0278 | 806 | |
16b0520a PE |
807 | sym = XCAR (args); |
808 | if (CONSP (Fcdr (XCDR (XCDR (args))))) | |
921baa95 | 809 | error ("Too many arguments"); |
a42ba017 | 810 | |
16b0520a | 811 | tem = eval_sub (Fcar (XCDR (args))); |
1182a7cb DL |
812 | if (!NILP (Vpurify_flag)) |
813 | tem = Fpurecopy (tem); | |
814 | Fset_default (sym, tem); | |
b9598260 | 815 | XSYMBOL (sym)->declared_special = 1; |
16b0520a | 816 | tem = Fcar (XCDR (XCDR (args))); |
265a9e55 | 817 | if (!NILP (tem)) |
db9f0278 | 818 | { |
265a9e55 | 819 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
820 | tem = Fpurecopy (tem); |
821 | Fput (sym, Qvariable_documentation, tem); | |
822 | } | |
873759d5 | 823 | Fput (sym, Qrisky_local_variable, Qt); |
6fd797f5 | 824 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
825 | return sym; |
826 | } | |
827 | ||
513749ee SM |
828 | /* Make SYMBOL lexically scoped. */ |
829 | DEFUN ("internal-make-var-non-special", Fmake_var_non_special, | |
830 | Smake_var_non_special, 1, 1, 0, | |
831 | doc: /* Internal function. */) | |
832 | (Lisp_Object symbol) | |
833 | { | |
834 | CHECK_SYMBOL (symbol); | |
835 | XSYMBOL (symbol)->declared_special = 0; | |
836 | return Qnil; | |
837 | } | |
838 | ||
db9f0278 JB |
839 | \f |
840 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
841 | doc: /* Bind variables according to VARLIST then eval BODY. |
842 | The value of the last form in BODY is returned. | |
843 | Each element of VARLIST is a symbol (which is bound to nil) | |
844 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
845 | Each VALUEFORM can refer to the symbols already bound by this VARLIST. | |
7a25dc6d | 846 | usage: (let* VARLIST BODY...) */) |
5842a27b | 847 | (Lisp_Object args) |
db9f0278 | 848 | { |
b9598260 | 849 | Lisp_Object varlist, var, val, elt, lexenv; |
d311d28c | 850 | ptrdiff_t count = SPECPDL_INDEX (); |
db9f0278 JB |
851 | struct gcpro gcpro1, gcpro2, gcpro3; |
852 | ||
853 | GCPRO3 (args, elt, varlist); | |
854 | ||
b9598260 SM |
855 | lexenv = Vinternal_interpreter_environment; |
856 | ||
16b0520a | 857 | varlist = XCAR (args); |
b9598260 | 858 | while (CONSP (varlist)) |
db9f0278 JB |
859 | { |
860 | QUIT; | |
b9598260 SM |
861 | |
862 | elt = XCAR (varlist); | |
90165123 | 863 | if (SYMBOLP (elt)) |
b9598260 SM |
864 | { |
865 | var = elt; | |
866 | val = Qnil; | |
867 | } | |
08564963 | 868 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 869 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 JB |
870 | else |
871 | { | |
b9598260 | 872 | var = Fcar (elt); |
defb1411 | 873 | val = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 | 874 | } |
b9598260 | 875 | |
f07a954e SM |
876 | if (!NILP (lexenv) && SYMBOLP (var) |
877 | && !XSYMBOL (var)->declared_special | |
878 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
879 | /* Lexically bind VAR by adding it to the interpreter's binding |
880 | alist. */ | |
881 | { | |
f07a954e SM |
882 | Lisp_Object newenv |
883 | = Fcons (Fcons (var, val), Vinternal_interpreter_environment); | |
884 | if (EQ (Vinternal_interpreter_environment, lexenv)) | |
885 | /* Save the old lexical environment on the specpdl stack, | |
886 | but only for the first lexical binding, since we'll never | |
887 | need to revert to one of the intermediate ones. */ | |
888 | specbind (Qinternal_interpreter_environment, newenv); | |
889 | else | |
890 | Vinternal_interpreter_environment = newenv; | |
db9f0278 | 891 | } |
b9598260 SM |
892 | else |
893 | specbind (var, val); | |
894 | ||
895 | varlist = XCDR (varlist); | |
db9f0278 JB |
896 | } |
897 | UNGCPRO; | |
16b0520a | 898 | val = Fprogn (XCDR (args)); |
db9f0278 JB |
899 | return unbind_to (count, val); |
900 | } | |
901 | ||
902 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
903 | doc: /* Bind variables according to VARLIST then eval BODY. |
904 | The value of the last form in BODY is returned. | |
905 | Each element of VARLIST is a symbol (which is bound to nil) | |
906 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM). | |
907 | All the VALUEFORMs are evalled before any symbols are bound. | |
7a25dc6d | 908 | usage: (let VARLIST BODY...) */) |
5842a27b | 909 | (Lisp_Object args) |
db9f0278 | 910 | { |
b9598260 | 911 | Lisp_Object *temps, tem, lexenv; |
db9f0278 | 912 | register Lisp_Object elt, varlist; |
d311d28c | 913 | ptrdiff_t count = SPECPDL_INDEX (); |
f66c7cf8 | 914 | ptrdiff_t argnum; |
db9f0278 | 915 | struct gcpro gcpro1, gcpro2; |
3a7a9129 | 916 | USE_SAFE_ALLOCA; |
db9f0278 | 917 | |
16b0520a | 918 | varlist = XCAR (args); |
db9f0278 | 919 | |
f6d62986 | 920 | /* Make space to hold the values to give the bound variables. */ |
db9f0278 | 921 | elt = Flength (varlist); |
b72e0717 | 922 | SAFE_ALLOCA_LISP (temps, XFASTINT (elt)); |
db9f0278 | 923 | |
f6d62986 | 924 | /* Compute the values and store them in `temps'. */ |
db9f0278 JB |
925 | |
926 | GCPRO2 (args, *temps); | |
927 | gcpro2.nvars = 0; | |
928 | ||
67ee9f6e | 929 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 JB |
930 | { |
931 | QUIT; | |
67ee9f6e | 932 | elt = XCAR (varlist); |
90165123 | 933 | if (SYMBOLP (elt)) |
db9f0278 | 934 | temps [argnum++] = Qnil; |
08564963 | 935 | else if (! NILP (Fcdr (Fcdr (elt)))) |
734d55a2 | 936 | signal_error ("`let' bindings can have only one value-form", elt); |
db9f0278 | 937 | else |
defb1411 | 938 | temps [argnum++] = eval_sub (Fcar (Fcdr (elt))); |
db9f0278 JB |
939 | gcpro2.nvars = argnum; |
940 | } | |
941 | UNGCPRO; | |
942 | ||
b9598260 SM |
943 | lexenv = Vinternal_interpreter_environment; |
944 | ||
16b0520a | 945 | varlist = XCAR (args); |
67ee9f6e | 946 | for (argnum = 0; CONSP (varlist); varlist = XCDR (varlist)) |
db9f0278 | 947 | { |
b9598260 SM |
948 | Lisp_Object var; |
949 | ||
67ee9f6e | 950 | elt = XCAR (varlist); |
b9598260 | 951 | var = SYMBOLP (elt) ? elt : Fcar (elt); |
db9f0278 | 952 | tem = temps[argnum++]; |
b9598260 | 953 | |
f07a954e SM |
954 | if (!NILP (lexenv) && SYMBOLP (var) |
955 | && !XSYMBOL (var)->declared_special | |
956 | && NILP (Fmemq (var, Vinternal_interpreter_environment))) | |
b9598260 SM |
957 | /* Lexically bind VAR by adding it to the lexenv alist. */ |
958 | lexenv = Fcons (Fcons (var, tem), lexenv); | |
db9f0278 | 959 | else |
b9598260 SM |
960 | /* Dynamically bind VAR. */ |
961 | specbind (var, tem); | |
db9f0278 JB |
962 | } |
963 | ||
b9598260 SM |
964 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
965 | /* Instantiate a new lexical environment. */ | |
966 | specbind (Qinternal_interpreter_environment, lexenv); | |
967 | ||
16b0520a | 968 | elt = Fprogn (XCDR (args)); |
3a7a9129 | 969 | SAFE_FREE (); |
db9f0278 JB |
970 | return unbind_to (count, elt); |
971 | } | |
972 | ||
973 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
974 | doc: /* If TEST yields non-nil, eval BODY... and repeat. |
975 | The order of execution is thus TEST, BODY, TEST, BODY and so on | |
976 | until TEST returns nil. | |
7a25dc6d | 977 | usage: (while TEST BODY...) */) |
5842a27b | 978 | (Lisp_Object args) |
db9f0278 | 979 | { |
2b9bde76 | 980 | Lisp_Object test, body; |
db9f0278 JB |
981 | struct gcpro gcpro1, gcpro2; |
982 | ||
983 | GCPRO2 (test, body); | |
984 | ||
16b0520a PE |
985 | test = XCAR (args); |
986 | body = XCDR (args); | |
defb1411 | 987 | while (!NILP (eval_sub (test))) |
db9f0278 JB |
988 | { |
989 | QUIT; | |
990 | Fprogn (body); | |
991 | } | |
992 | ||
993 | UNGCPRO; | |
994 | return Qnil; | |
995 | } | |
996 | ||
997 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
9dbc9081 PJ |
998 | doc: /* Return result of expanding macros at top level of FORM. |
999 | If FORM is not a macro call, it is returned unchanged. | |
1000 | Otherwise, the macro is expanded and the expansion is considered | |
1001 | in place of FORM. When a non-macro-call results, it is returned. | |
1002 | ||
1003 | The second optional arg ENVIRONMENT specifies an environment of macro | |
1004 | definitions to shadow the loaded ones for use in file byte-compilation. */) | |
5842a27b | 1005 | (Lisp_Object form, Lisp_Object environment) |
db9f0278 | 1006 | { |
23d6b5a6 | 1007 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
1008 | register Lisp_Object expander, sym, def, tem; |
1009 | ||
1010 | while (1) | |
1011 | { | |
1012 | /* Come back here each time we expand a macro call, | |
1013 | in case it expands into another macro call. */ | |
90165123 | 1014 | if (!CONSP (form)) |
db9f0278 | 1015 | break; |
23d6b5a6 | 1016 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
03699b14 | 1017 | def = sym = XCAR (form); |
23d6b5a6 | 1018 | tem = Qnil; |
db9f0278 JB |
1019 | /* Trace symbols aliases to other symbols |
1020 | until we get a symbol that is not an alias. */ | |
90165123 | 1021 | while (SYMBOLP (def)) |
db9f0278 JB |
1022 | { |
1023 | QUIT; | |
23d6b5a6 | 1024 | sym = def; |
79e8bfbf | 1025 | tem = Fassq (sym, environment); |
265a9e55 | 1026 | if (NILP (tem)) |
db9f0278 | 1027 | { |
c644523b | 1028 | def = XSYMBOL (sym)->function; |
eadf1faa | 1029 | if (!NILP (def)) |
23d6b5a6 | 1030 | continue; |
db9f0278 | 1031 | } |
23d6b5a6 | 1032 | break; |
db9f0278 | 1033 | } |
79e8bfbf | 1034 | /* Right now TEM is the result from SYM in ENVIRONMENT, |
db9f0278 | 1035 | and if TEM is nil then DEF is SYM's function definition. */ |
265a9e55 | 1036 | if (NILP (tem)) |
db9f0278 | 1037 | { |
79e8bfbf | 1038 | /* SYM is not mentioned in ENVIRONMENT. |
db9f0278 | 1039 | Look at its function definition. */ |
7abaf5cc SM |
1040 | struct gcpro gcpro1; |
1041 | GCPRO1 (form); | |
1042 | def = Fautoload_do_load (def, sym, Qmacro); | |
1043 | UNGCPRO; | |
eadf1faa | 1044 | if (!CONSP (def)) |
f6d62986 | 1045 | /* Not defined or definition not suitable. */ |
db9f0278 | 1046 | break; |
7abaf5cc | 1047 | if (!EQ (XCAR (def), Qmacro)) |
db9f0278 | 1048 | break; |
03699b14 | 1049 | else expander = XCDR (def); |
db9f0278 JB |
1050 | } |
1051 | else | |
1052 | { | |
03699b14 | 1053 | expander = XCDR (tem); |
265a9e55 | 1054 | if (NILP (expander)) |
db9f0278 JB |
1055 | break; |
1056 | } | |
4f18a4ed SM |
1057 | { |
1058 | Lisp_Object newform = apply1 (expander, XCDR (form)); | |
1059 | if (EQ (form, newform)) | |
1060 | break; | |
1061 | else | |
1062 | form = newform; | |
1063 | } | |
db9f0278 JB |
1064 | } |
1065 | return form; | |
1066 | } | |
1067 | \f | |
1068 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1069 | doc: /* Eval BODY allowing nonlocal exits using `throw'. |
1070 | TAG is evalled to get the tag to use; it must not be nil. | |
1071 | ||
1072 | Then the BODY is executed. | |
1d632ccf | 1073 | Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'. |
9dbc9081 PJ |
1074 | If no throw happens, `catch' returns the value of the last BODY form. |
1075 | If a throw happens, it specifies the value to return from `catch'. | |
7a25dc6d | 1076 | usage: (catch TAG BODY...) */) |
5842a27b | 1077 | (Lisp_Object args) |
db9f0278 JB |
1078 | { |
1079 | register Lisp_Object tag; | |
1080 | struct gcpro gcpro1; | |
1081 | ||
1082 | GCPRO1 (args); | |
16b0520a | 1083 | tag = eval_sub (XCAR (args)); |
db9f0278 | 1084 | UNGCPRO; |
16b0520a | 1085 | return internal_catch (tag, Fprogn, XCDR (args)); |
db9f0278 JB |
1086 | } |
1087 | ||
1088 | /* Set up a catch, then call C function FUNC on argument ARG. | |
1089 | FUNC should return a Lisp_Object. | |
2f592f95 | 1090 | This is how catches are done from within C code. */ |
db9f0278 JB |
1091 | |
1092 | Lisp_Object | |
d3da34e0 | 1093 | internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg) |
db9f0278 JB |
1094 | { |
1095 | /* This structure is made part of the chain `catchlist'. */ | |
1096 | struct catchtag c; | |
1097 | ||
1098 | /* Fill in the components of c, and put it on the list. */ | |
1099 | c.next = catchlist; | |
1100 | c.tag = tag; | |
1101 | c.val = Qnil; | |
db9f0278 JB |
1102 | c.handlerlist = handlerlist; |
1103 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1104 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1105 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1106 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1107 | c.gcpro = gcprolist; |
bcf28080 | 1108 | c.byte_stack = byte_stack_list; |
db9f0278 JB |
1109 | catchlist = &c; |
1110 | ||
1111 | /* Call FUNC. */ | |
0328b6de | 1112 | if (! sys_setjmp (c.jmp)) |
db9f0278 JB |
1113 | c.val = (*func) (arg); |
1114 | ||
1115 | /* Throw works by a longjmp that comes right here. */ | |
1116 | catchlist = c.next; | |
1117 | return c.val; | |
1118 | } | |
1119 | ||
ba410f40 JB |
1120 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
1121 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 1122 | |
4d7e6e51 | 1123 | This is the guts of Fthrow and Fsignal; they differ only in the way |
ba410f40 JB |
1124 | they choose the catch tag to throw to. A catch tag for a |
1125 | condition-case form has a TAG of Qnil. | |
db9f0278 | 1126 | |
ba410f40 JB |
1127 | Before each catch is discarded, unbind all special bindings and |
1128 | execute all unwind-protect clauses made above that catch. Unwind | |
1129 | the handler stack as we go, so that the proper handlers are in | |
1130 | effect for each unwind-protect clause we run. At the end, restore | |
1131 | some static info saved in CATCH, and longjmp to the location | |
4d7e6e51 | 1132 | specified there. |
ba410f40 JB |
1133 | |
1134 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 | 1135 | |
845ca893 | 1136 | static _Noreturn void |
d3da34e0 | 1137 | unwind_to_catch (struct catchtag *catch, Lisp_Object value) |
db9f0278 | 1138 | { |
1882aa38 | 1139 | bool last_time; |
db9f0278 | 1140 | |
ba410f40 JB |
1141 | /* Save the value in the tag. */ |
1142 | catch->val = value; | |
1143 | ||
0b31741c | 1144 | /* Restore certain special C variables. */ |
1cdc3155 | 1145 | set_poll_suppress_count (catch->poll_suppress_count); |
4d7e6e51 | 1146 | unblock_input_to (catch->interrupt_input_blocked); |
69bbd6bd | 1147 | immediate_quit = 0; |
82da7701 | 1148 | |
db9f0278 JB |
1149 | do |
1150 | { | |
1151 | last_time = catchlist == catch; | |
82da7701 JB |
1152 | |
1153 | /* Unwind the specpdl stack, and then restore the proper set of | |
bb8e180f | 1154 | handlers. */ |
db9f0278 JB |
1155 | unbind_to (catchlist->pdlcount, Qnil); |
1156 | handlerlist = catchlist->handlerlist; | |
1157 | catchlist = catchlist->next; | |
1158 | } | |
1159 | while (! last_time); | |
1160 | ||
bcf28080 | 1161 | byte_stack_list = catch->byte_stack; |
db9f0278 | 1162 | gcprolist = catch->gcpro; |
15934ffa | 1163 | #ifdef DEBUG_GCPRO |
d8e2b5ba | 1164 | gcpro_level = gcprolist ? gcprolist->level + 1 : 0; |
15934ffa | 1165 | #endif |
db9f0278 | 1166 | lisp_eval_depth = catch->lisp_eval_depth; |
177c0ea7 | 1167 | |
0328b6de | 1168 | sys_longjmp (catch->jmp, 1); |
db9f0278 JB |
1169 | } |
1170 | ||
a7ca3326 | 1171 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, |
9dbc9081 PJ |
1172 | doc: /* Throw to the catch for TAG and return VALUE from it. |
1173 | Both TAG and VALUE are evalled. */) | |
5842a27b | 1174 | (register Lisp_Object tag, Lisp_Object value) |
db9f0278 JB |
1175 | { |
1176 | register struct catchtag *c; | |
1177 | ||
8788120f KS |
1178 | if (!NILP (tag)) |
1179 | for (c = catchlist; c; c = c->next) | |
1180 | { | |
1181 | if (EQ (c->tag, tag)) | |
1182 | unwind_to_catch (c, value); | |
1183 | } | |
734d55a2 | 1184 | xsignal2 (Qno_catch, tag, value); |
db9f0278 JB |
1185 | } |
1186 | ||
1187 | ||
1188 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
9dbc9081 PJ |
1189 | doc: /* Do BODYFORM, protecting with UNWINDFORMS. |
1190 | If BODYFORM completes normally, its value is returned | |
1191 | after executing the UNWINDFORMS. | |
1192 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway. | |
7a25dc6d | 1193 | usage: (unwind-protect BODYFORM UNWINDFORMS...) */) |
5842a27b | 1194 | (Lisp_Object args) |
db9f0278 JB |
1195 | { |
1196 | Lisp_Object val; | |
d311d28c | 1197 | ptrdiff_t count = SPECPDL_INDEX (); |
db9f0278 | 1198 | |
16b0520a PE |
1199 | record_unwind_protect (unwind_body, XCDR (args)); |
1200 | val = eval_sub (XCAR (args)); | |
177c0ea7 | 1201 | return unbind_to (count, val); |
db9f0278 JB |
1202 | } |
1203 | \f | |
db9f0278 | 1204 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, |
9dbc9081 | 1205 | doc: /* Regain control when an error is signaled. |
1b1acc13 | 1206 | Executes BODYFORM and returns its value if no error happens. |
9dbc9081 PJ |
1207 | Each element of HANDLERS looks like (CONDITION-NAME BODY...) |
1208 | where the BODY is made of Lisp expressions. | |
1209 | ||
1210 | A handler is applicable to an error | |
1211 | if CONDITION-NAME is one of the error's condition names. | |
1212 | If an error happens, the first applicable handler is run. | |
1213 | ||
024a2d76 CY |
1214 | The car of a handler may be a list of condition names instead of a |
1215 | single condition name; then it handles all of them. If the special | |
1216 | condition name `debug' is present in this list, it allows another | |
1217 | condition in the list to run the debugger if `debug-on-error' and the | |
1218 | other usual mechanisms says it should (otherwise, `condition-case' | |
1219 | suppresses the debugger). | |
9dbc9081 | 1220 | |
c997bb25 RS |
1221 | When a handler handles an error, control returns to the `condition-case' |
1222 | and it executes the handler's BODY... | |
d0acbbaf | 1223 | with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error. |
bb8e180f | 1224 | \(If VAR is nil, the handler can't access that information.) |
c997bb25 RS |
1225 | Then the value of the last BODY form is returned from the `condition-case' |
1226 | expression. | |
9dbc9081 | 1227 | |
9dbc9081 | 1228 | See also the function `signal' for more info. |
2b47b74d | 1229 | usage: (condition-case VAR BODYFORM &rest HANDLERS) */) |
bb8e180f | 1230 | (Lisp_Object args) |
db9f0278 | 1231 | { |
16b0520a PE |
1232 | Lisp_Object var = XCAR (args); |
1233 | Lisp_Object bodyform = XCAR (XCDR (args)); | |
1234 | Lisp_Object handlers = XCDR (XCDR (args)); | |
ee830945 RS |
1235 | |
1236 | return internal_lisp_condition_case (var, bodyform, handlers); | |
1237 | } | |
1238 | ||
1239 | /* Like Fcondition_case, but the args are separate | |
1240 | rather than passed in a list. Used by Fbyte_code. */ | |
1241 | ||
1242 | Lisp_Object | |
d3da34e0 JB |
1243 | internal_lisp_condition_case (volatile Lisp_Object var, Lisp_Object bodyform, |
1244 | Lisp_Object handlers) | |
ee830945 RS |
1245 | { |
1246 | Lisp_Object val; | |
1247 | struct catchtag c; | |
1248 | struct handler h; | |
1249 | ||
b7826503 | 1250 | CHECK_SYMBOL (var); |
82da7701 | 1251 | |
2b47b74d | 1252 | for (val = handlers; CONSP (val); val = XCDR (val)) |
82da7701 JB |
1253 | { |
1254 | Lisp_Object tem; | |
2b47b74d | 1255 | tem = XCAR (val); |
5f96776a RS |
1256 | if (! (NILP (tem) |
1257 | || (CONSP (tem) | |
03699b14 KR |
1258 | && (SYMBOLP (XCAR (tem)) |
1259 | || CONSP (XCAR (tem)))))) | |
e6c3da20 EZ |
1260 | error ("Invalid condition handler: %s", |
1261 | SDATA (Fprin1_to_string (tem, Qt))); | |
82da7701 | 1262 | } |
db9f0278 JB |
1263 | |
1264 | c.tag = Qnil; | |
1265 | c.val = Qnil; | |
db9f0278 JB |
1266 | c.handlerlist = handlerlist; |
1267 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1268 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1269 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1270 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1271 | c.gcpro = gcprolist; |
bcf28080 | 1272 | c.byte_stack = byte_stack_list; |
0328b6de | 1273 | if (sys_setjmp (c.jmp)) |
db9f0278 | 1274 | { |
265a9e55 | 1275 | if (!NILP (h.var)) |
bb8e180f | 1276 | specbind (h.var, c.val); |
9d58218c | 1277 | val = Fprogn (Fcdr (h.chosen_clause)); |
82da7701 JB |
1278 | |
1279 | /* Note that this just undoes the binding of h.var; whoever | |
1280 | longjumped to us unwound the stack to c.pdlcount before | |
2f592f95 | 1281 | throwing. */ |
db9f0278 JB |
1282 | unbind_to (c.pdlcount, Qnil); |
1283 | return val; | |
1284 | } | |
1285 | c.next = catchlist; | |
1286 | catchlist = &c; | |
177c0ea7 | 1287 | |
82da7701 JB |
1288 | h.var = var; |
1289 | h.handler = handlers; | |
db9f0278 | 1290 | h.next = handlerlist; |
db9f0278 JB |
1291 | h.tag = &c; |
1292 | handlerlist = &h; | |
1293 | ||
defb1411 | 1294 | val = eval_sub (bodyform); |
db9f0278 JB |
1295 | catchlist = c.next; |
1296 | handlerlist = h.next; | |
1297 | return val; | |
1298 | } | |
1299 | ||
f029ca5f RS |
1300 | /* Call the function BFUN with no arguments, catching errors within it |
1301 | according to HANDLERS. If there is an error, call HFUN with | |
1302 | one argument which is the data that describes the error: | |
1303 | (SIGNALNAME . DATA) | |
1304 | ||
1305 | HANDLERS can be a list of conditions to catch. | |
1306 | If HANDLERS is Qt, catch all errors. | |
1307 | If HANDLERS is Qerror, catch all errors | |
1308 | but allow the debugger to run if that is enabled. */ | |
1309 | ||
db9f0278 | 1310 | Lisp_Object |
d3da34e0 JB |
1311 | internal_condition_case (Lisp_Object (*bfun) (void), Lisp_Object handlers, |
1312 | Lisp_Object (*hfun) (Lisp_Object)) | |
db9f0278 JB |
1313 | { |
1314 | Lisp_Object val; | |
1315 | struct catchtag c; | |
1316 | struct handler h; | |
1317 | ||
1318 | c.tag = Qnil; | |
1319 | c.val = Qnil; | |
db9f0278 JB |
1320 | c.handlerlist = handlerlist; |
1321 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1322 | c.pdlcount = SPECPDL_INDEX (); |
db9f0278 | 1323 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1324 | c.interrupt_input_blocked = interrupt_input_blocked; |
db9f0278 | 1325 | c.gcpro = gcprolist; |
bcf28080 | 1326 | c.byte_stack = byte_stack_list; |
0328b6de | 1327 | if (sys_setjmp (c.jmp)) |
db9f0278 | 1328 | { |
9d58218c | 1329 | return (*hfun) (c.val); |
db9f0278 JB |
1330 | } |
1331 | c.next = catchlist; | |
1332 | catchlist = &c; | |
1333 | h.handler = handlers; | |
1334 | h.var = Qnil; | |
db9f0278 JB |
1335 | h.next = handlerlist; |
1336 | h.tag = &c; | |
1337 | handlerlist = &h; | |
1338 | ||
1339 | val = (*bfun) (); | |
1340 | catchlist = c.next; | |
1341 | handlerlist = h.next; | |
1342 | return val; | |
1343 | } | |
1344 | ||
2659a09f | 1345 | /* Like internal_condition_case but call BFUN with ARG as its argument. */ |
f029ca5f | 1346 | |
d227775c | 1347 | Lisp_Object |
d3da34e0 JB |
1348 | internal_condition_case_1 (Lisp_Object (*bfun) (Lisp_Object), Lisp_Object arg, |
1349 | Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object)) | |
d227775c RS |
1350 | { |
1351 | Lisp_Object val; | |
1352 | struct catchtag c; | |
1353 | struct handler h; | |
1354 | ||
1355 | c.tag = Qnil; | |
1356 | c.val = Qnil; | |
d227775c RS |
1357 | c.handlerlist = handlerlist; |
1358 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1359 | c.pdlcount = SPECPDL_INDEX (); |
d227775c | 1360 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1361 | c.interrupt_input_blocked = interrupt_input_blocked; |
d227775c | 1362 | c.gcpro = gcprolist; |
bcf28080 | 1363 | c.byte_stack = byte_stack_list; |
0328b6de | 1364 | if (sys_setjmp (c.jmp)) |
d227775c | 1365 | { |
9d58218c | 1366 | return (*hfun) (c.val); |
d227775c RS |
1367 | } |
1368 | c.next = catchlist; | |
1369 | catchlist = &c; | |
1370 | h.handler = handlers; | |
1371 | h.var = Qnil; | |
1372 | h.next = handlerlist; | |
1373 | h.tag = &c; | |
1374 | handlerlist = &h; | |
1375 | ||
1376 | val = (*bfun) (arg); | |
1377 | catchlist = c.next; | |
1378 | handlerlist = h.next; | |
1379 | return val; | |
1380 | } | |
10b29d41 | 1381 | |
53967e09 CY |
1382 | /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as |
1383 | its arguments. */ | |
1384 | ||
1385 | Lisp_Object | |
178f2507 SM |
1386 | internal_condition_case_2 (Lisp_Object (*bfun) (Lisp_Object, Lisp_Object), |
1387 | Lisp_Object arg1, | |
1388 | Lisp_Object arg2, | |
1389 | Lisp_Object handlers, | |
1390 | Lisp_Object (*hfun) (Lisp_Object)) | |
53967e09 CY |
1391 | { |
1392 | Lisp_Object val; | |
1393 | struct catchtag c; | |
1394 | struct handler h; | |
1395 | ||
53967e09 CY |
1396 | c.tag = Qnil; |
1397 | c.val = Qnil; | |
53967e09 CY |
1398 | c.handlerlist = handlerlist; |
1399 | c.lisp_eval_depth = lisp_eval_depth; | |
1400 | c.pdlcount = SPECPDL_INDEX (); | |
1401 | c.poll_suppress_count = poll_suppress_count; | |
1402 | c.interrupt_input_blocked = interrupt_input_blocked; | |
1403 | c.gcpro = gcprolist; | |
1404 | c.byte_stack = byte_stack_list; | |
0328b6de | 1405 | if (sys_setjmp (c.jmp)) |
53967e09 CY |
1406 | { |
1407 | return (*hfun) (c.val); | |
1408 | } | |
1409 | c.next = catchlist; | |
1410 | catchlist = &c; | |
1411 | h.handler = handlers; | |
1412 | h.var = Qnil; | |
1413 | h.next = handlerlist; | |
1414 | h.tag = &c; | |
1415 | handlerlist = &h; | |
1416 | ||
1417 | val = (*bfun) (arg1, arg2); | |
1418 | catchlist = c.next; | |
1419 | handlerlist = h.next; | |
1420 | return val; | |
1421 | } | |
10b29d41 | 1422 | |
2659a09f | 1423 | /* Like internal_condition_case but call BFUN with NARGS as first, |
10b29d41 GM |
1424 | and ARGS as second argument. */ |
1425 | ||
1426 | Lisp_Object | |
f66c7cf8 PE |
1427 | internal_condition_case_n (Lisp_Object (*bfun) (ptrdiff_t, Lisp_Object *), |
1428 | ptrdiff_t nargs, | |
178f2507 SM |
1429 | Lisp_Object *args, |
1430 | Lisp_Object handlers, | |
cc92c454 SM |
1431 | Lisp_Object (*hfun) (Lisp_Object err, |
1432 | ptrdiff_t nargs, | |
1433 | Lisp_Object *args)) | |
10b29d41 GM |
1434 | { |
1435 | Lisp_Object val; | |
1436 | struct catchtag c; | |
1437 | struct handler h; | |
1438 | ||
1439 | c.tag = Qnil; | |
1440 | c.val = Qnil; | |
10b29d41 GM |
1441 | c.handlerlist = handlerlist; |
1442 | c.lisp_eval_depth = lisp_eval_depth; | |
aed13378 | 1443 | c.pdlcount = SPECPDL_INDEX (); |
10b29d41 | 1444 | c.poll_suppress_count = poll_suppress_count; |
2659a09f | 1445 | c.interrupt_input_blocked = interrupt_input_blocked; |
10b29d41 GM |
1446 | c.gcpro = gcprolist; |
1447 | c.byte_stack = byte_stack_list; | |
0328b6de | 1448 | if (sys_setjmp (c.jmp)) |
10b29d41 | 1449 | { |
cc92c454 | 1450 | return (*hfun) (c.val, nargs, args); |
10b29d41 GM |
1451 | } |
1452 | c.next = catchlist; | |
1453 | catchlist = &c; | |
1454 | h.handler = handlers; | |
1455 | h.var = Qnil; | |
1456 | h.next = handlerlist; | |
1457 | h.tag = &c; | |
1458 | handlerlist = &h; | |
1459 | ||
1460 | val = (*bfun) (nargs, args); | |
1461 | catchlist = c.next; | |
1462 | handlerlist = h.next; | |
1463 | return val; | |
1464 | } | |
1465 | ||
d227775c | 1466 | \f |
7d47b580 | 1467 | static Lisp_Object find_handler_clause (Lisp_Object, Lisp_Object); |
1882aa38 PE |
1468 | static bool maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, |
1469 | Lisp_Object data); | |
db9f0278 | 1470 | |
6d5eb5b0 SM |
1471 | void |
1472 | process_quit_flag (void) | |
1473 | { | |
1474 | Lisp_Object flag = Vquit_flag; | |
1475 | Vquit_flag = Qnil; | |
1476 | if (EQ (flag, Qkill_emacs)) | |
1477 | Fkill_emacs (Qnil); | |
1478 | if (EQ (Vthrow_on_input, flag)) | |
1479 | Fthrow (Vthrow_on_input, Qt); | |
1480 | Fsignal (Qquit, Qnil); | |
1481 | } | |
1482 | ||
a7ca3326 | 1483 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, |
9dbc9081 PJ |
1484 | doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA. |
1485 | This function does not return. | |
1486 | ||
1487 | An error symbol is a symbol with an `error-conditions' property | |
1488 | that is a list of condition names. | |
1489 | A handler for any of those names will get to handle this signal. | |
1490 | The symbol `error' should normally be one of them. | |
1491 | ||
1492 | DATA should be a list. Its elements are printed as part of the error message. | |
3297ec22 LT |
1493 | See Info anchor `(elisp)Definition of signal' for some details on how this |
1494 | error message is constructed. | |
9dbc9081 PJ |
1495 | If the signal is handled, DATA is made available to the handler. |
1496 | See also the function `condition-case'. */) | |
5842a27b | 1497 | (Lisp_Object error_symbol, Lisp_Object data) |
db9f0278 | 1498 | { |
bfa8ca43 | 1499 | /* When memory is full, ERROR-SYMBOL is nil, |
26631f2b RS |
1500 | and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). |
1501 | That is a special case--don't do this in other situations. */ | |
db9f0278 | 1502 | Lisp_Object conditions; |
c11d3d17 | 1503 | Lisp_Object string; |
e7f7fbaa SM |
1504 | Lisp_Object real_error_symbol |
1505 | = (NILP (error_symbol) ? Fcar (data) : error_symbol); | |
1506 | register Lisp_Object clause = Qnil; | |
1507 | struct handler *h; | |
db9f0278 | 1508 | |
0caaedb1 | 1509 | immediate_quit = 0; |
d063129f | 1510 | abort_on_gc = 0; |
db9f0278 | 1511 | if (gc_in_progress || waiting_for_input) |
1088b922 | 1512 | emacs_abort (); |
db9f0278 | 1513 | |
26631f2b RS |
1514 | #if 0 /* rms: I don't know why this was here, |
1515 | but it is surely wrong for an error that is handled. */ | |
d148e14d | 1516 | #ifdef HAVE_WINDOW_SYSTEM |
df6c90d8 GM |
1517 | if (display_hourglass_p) |
1518 | cancel_hourglass (); | |
48f8dfa3 | 1519 | #endif |
177c0ea7 | 1520 | #endif |
48f8dfa3 | 1521 | |
61ede770 | 1522 | /* This hook is used by edebug. */ |
26631f2b RS |
1523 | if (! NILP (Vsignal_hook_function) |
1524 | && ! NILP (error_symbol)) | |
9f5903bb RS |
1525 | { |
1526 | /* Edebug takes care of restoring these variables when it exits. */ | |
1527 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
1528 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
1529 | ||
1530 | if (SPECPDL_INDEX () + 40 > max_specpdl_size) | |
1531 | max_specpdl_size = SPECPDL_INDEX () + 40; | |
1532 | ||
1533 | call2 (Vsignal_hook_function, error_symbol, data); | |
1534 | } | |
61ede770 | 1535 | |
1ea9dec4 | 1536 | conditions = Fget (real_error_symbol, Qerror_conditions); |
db9f0278 | 1537 | |
a2ff3819 GM |
1538 | /* Remember from where signal was called. Skip over the frame for |
1539 | `signal' itself. If a frame for `error' follows, skip that, | |
26631f2b RS |
1540 | too. Don't do this when ERROR_SYMBOL is nil, because that |
1541 | is a memory-full error. */ | |
090a072f | 1542 | Vsignaling_function = Qnil; |
2f592f95 | 1543 | if (!NILP (error_symbol)) |
090a072f | 1544 | { |
9349e5f7 | 1545 | union specbinding *pdl = backtrace_next (backtrace_top ()); |
2f592f95 SM |
1546 | if (backtrace_p (pdl) && EQ (backtrace_function (pdl), Qerror)) |
1547 | pdl = backtrace_next (pdl); | |
1548 | if (backtrace_p (pdl)) | |
1549 | Vsignaling_function = backtrace_function (pdl); | |
090a072f | 1550 | } |
a2ff3819 | 1551 | |
e7f7fbaa | 1552 | for (h = handlerlist; h; h = h->next) |
db9f0278 | 1553 | { |
7d47b580 | 1554 | clause = find_handler_clause (h->handler, conditions); |
265a9e55 | 1555 | if (!NILP (clause)) |
e7f7fbaa | 1556 | break; |
db9f0278 | 1557 | } |
475545b5 | 1558 | |
e7f7fbaa | 1559 | if (/* Don't run the debugger for a memory-full error. |
e7c1b6ef | 1560 | (There is no room in memory to do that!) */ |
e7f7fbaa SM |
1561 | !NILP (error_symbol) |
1562 | && (!NILP (Vdebug_on_signal) | |
1563 | /* If no handler is present now, try to run the debugger. */ | |
1564 | || NILP (clause) | |
bd1ba3e8 CY |
1565 | /* A `debug' symbol in the handler list disables the normal |
1566 | suppression of the debugger. */ | |
1567 | || (CONSP (clause) && CONSP (XCAR (clause)) | |
1568 | && !NILP (Fmemq (Qdebug, XCAR (clause)))) | |
e7f7fbaa SM |
1569 | /* Special handler that means "print a message and run debugger |
1570 | if requested". */ | |
1571 | || EQ (h->handler, Qerror))) | |
1572 | { | |
1882aa38 | 1573 | bool debugger_called |
e7f7fbaa SM |
1574 | = maybe_call_debugger (conditions, error_symbol, data); |
1575 | /* We can't return values to code which signaled an error, but we | |
1576 | can continue code which has signaled a quit. */ | |
1577 | if (debugger_called && EQ (real_error_symbol, Qquit)) | |
1578 | return Qnil; | |
475545b5 | 1579 | } |
db9f0278 | 1580 | |
e7f7fbaa SM |
1581 | if (!NILP (clause)) |
1582 | { | |
1583 | Lisp_Object unwind_data | |
1584 | = (NILP (error_symbol) ? data : Fcons (error_symbol, data)); | |
475545b5 | 1585 | |
e7f7fbaa SM |
1586 | h->chosen_clause = clause; |
1587 | unwind_to_catch (h->tag, unwind_data); | |
1588 | } | |
1589 | else | |
1590 | { | |
1591 | if (catchlist != 0) | |
1592 | Fthrow (Qtop_level, Qt); | |
1593 | } | |
c11d3d17 | 1594 | |
1ea9dec4 | 1595 | if (! NILP (error_symbol)) |
c11d3d17 | 1596 | data = Fcons (error_symbol, data); |
475545b5 | 1597 | |
c11d3d17 | 1598 | string = Ferror_message_string (data); |
583f48b9 | 1599 | fatal ("%s", SDATA (string)); |
db9f0278 JB |
1600 | } |
1601 | ||
734d55a2 KS |
1602 | /* Internal version of Fsignal that never returns. |
1603 | Used for anything but Qquit (which can return from Fsignal). */ | |
1604 | ||
1605 | void | |
d3da34e0 | 1606 | xsignal (Lisp_Object error_symbol, Lisp_Object data) |
734d55a2 KS |
1607 | { |
1608 | Fsignal (error_symbol, data); | |
1088b922 | 1609 | emacs_abort (); |
734d55a2 KS |
1610 | } |
1611 | ||
1612 | /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */ | |
1613 | ||
1614 | void | |
d3da34e0 | 1615 | xsignal0 (Lisp_Object error_symbol) |
734d55a2 KS |
1616 | { |
1617 | xsignal (error_symbol, Qnil); | |
1618 | } | |
1619 | ||
1620 | void | |
d3da34e0 | 1621 | xsignal1 (Lisp_Object error_symbol, Lisp_Object arg) |
734d55a2 KS |
1622 | { |
1623 | xsignal (error_symbol, list1 (arg)); | |
1624 | } | |
1625 | ||
1626 | void | |
d3da34e0 | 1627 | xsignal2 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2) |
734d55a2 KS |
1628 | { |
1629 | xsignal (error_symbol, list2 (arg1, arg2)); | |
1630 | } | |
1631 | ||
1632 | void | |
d3da34e0 | 1633 | xsignal3 (Lisp_Object error_symbol, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
734d55a2 KS |
1634 | { |
1635 | xsignal (error_symbol, list3 (arg1, arg2, arg3)); | |
1636 | } | |
1637 | ||
1638 | /* Signal `error' with message S, and additional arg ARG. | |
1639 | If ARG is not a genuine list, make it a one-element list. */ | |
1640 | ||
1641 | void | |
a8fe7202 | 1642 | signal_error (const char *s, Lisp_Object arg) |
734d55a2 KS |
1643 | { |
1644 | Lisp_Object tortoise, hare; | |
1645 | ||
1646 | hare = tortoise = arg; | |
1647 | while (CONSP (hare)) | |
1648 | { | |
1649 | hare = XCDR (hare); | |
1650 | if (!CONSP (hare)) | |
1651 | break; | |
1652 | ||
1653 | hare = XCDR (hare); | |
1654 | tortoise = XCDR (tortoise); | |
1655 | ||
1656 | if (EQ (hare, tortoise)) | |
1657 | break; | |
1658 | } | |
1659 | ||
1660 | if (!NILP (hare)) | |
6c6f1994 | 1661 | arg = list1 (arg); |
734d55a2 KS |
1662 | |
1663 | xsignal (Qerror, Fcons (build_string (s), arg)); | |
1664 | } | |
1665 | ||
1666 | ||
1882aa38 | 1667 | /* Return true if LIST is a non-nil atom or |
128c0f66 RM |
1668 | a list containing one of CONDITIONS. */ |
1669 | ||
1882aa38 | 1670 | static bool |
d3da34e0 | 1671 | wants_debugger (Lisp_Object list, Lisp_Object conditions) |
128c0f66 | 1672 | { |
4de86b16 | 1673 | if (NILP (list)) |
128c0f66 RM |
1674 | return 0; |
1675 | if (! CONSP (list)) | |
1676 | return 1; | |
1677 | ||
ab67260b | 1678 | while (CONSP (conditions)) |
128c0f66 | 1679 | { |
ab67260b | 1680 | Lisp_Object this, tail; |
03699b14 KR |
1681 | this = XCAR (conditions); |
1682 | for (tail = list; CONSP (tail); tail = XCDR (tail)) | |
1683 | if (EQ (XCAR (tail), this)) | |
128c0f66 | 1684 | return 1; |
03699b14 | 1685 | conditions = XCDR (conditions); |
128c0f66 | 1686 | } |
ab67260b | 1687 | return 0; |
128c0f66 RM |
1688 | } |
1689 | ||
1882aa38 | 1690 | /* Return true if an error with condition-symbols CONDITIONS, |
fc950e09 | 1691 | and described by SIGNAL-DATA, should skip the debugger |
1b1acc13 | 1692 | according to debugger-ignored-errors. */ |
fc950e09 | 1693 | |
1882aa38 | 1694 | static bool |
d3da34e0 | 1695 | skip_debugger (Lisp_Object conditions, Lisp_Object data) |
fc950e09 KH |
1696 | { |
1697 | Lisp_Object tail; | |
1882aa38 | 1698 | bool first_string = 1; |
fc950e09 KH |
1699 | Lisp_Object error_message; |
1700 | ||
17401c97 GM |
1701 | error_message = Qnil; |
1702 | for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail)) | |
fc950e09 | 1703 | { |
03699b14 | 1704 | if (STRINGP (XCAR (tail))) |
fc950e09 KH |
1705 | { |
1706 | if (first_string) | |
1707 | { | |
1708 | error_message = Ferror_message_string (data); | |
1709 | first_string = 0; | |
1710 | } | |
177c0ea7 | 1711 | |
03699b14 | 1712 | if (fast_string_match (XCAR (tail), error_message) >= 0) |
fc950e09 KH |
1713 | return 1; |
1714 | } | |
1715 | else | |
1716 | { | |
1717 | Lisp_Object contail; | |
1718 | ||
17401c97 | 1719 | for (contail = conditions; CONSP (contail); contail = XCDR (contail)) |
03699b14 | 1720 | if (EQ (XCAR (tail), XCAR (contail))) |
fc950e09 KH |
1721 | return 1; |
1722 | } | |
1723 | } | |
1724 | ||
1725 | return 0; | |
1726 | } | |
1727 | ||
ddaa36e1 | 1728 | /* Call the debugger if calling it is currently enabled for CONDITIONS. |
7d47b580 JB |
1729 | SIG and DATA describe the signal. There are two ways to pass them: |
1730 | = SIG is the error symbol, and DATA is the rest of the data. | |
1731 | = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA). | |
1732 | This is for memory-full errors only. */ | |
1882aa38 | 1733 | static bool |
d3da34e0 | 1734 | maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data) |
ddaa36e1 AS |
1735 | { |
1736 | Lisp_Object combined_data; | |
1737 | ||
1738 | combined_data = Fcons (sig, data); | |
1739 | ||
1740 | if ( | |
1741 | /* Don't try to run the debugger with interrupts blocked. | |
1742 | The editing loop would return anyway. */ | |
4d7e6e51 | 1743 | ! input_blocked_p () |
45b82ad0 | 1744 | && NILP (Vinhibit_debugger) |
ddaa36e1 AS |
1745 | /* Does user want to enter debugger for this kind of error? */ |
1746 | && (EQ (sig, Qquit) | |
1747 | ? debug_on_quit | |
1748 | : wants_debugger (Vdebug_on_error, conditions)) | |
1749 | && ! skip_debugger (conditions, combined_data) | |
f6d62986 | 1750 | /* RMS: What's this for? */ |
ddaa36e1 AS |
1751 | && when_entered_debugger < num_nonmacro_input_events) |
1752 | { | |
6c6f1994 | 1753 | call_debugger (list2 (Qerror, combined_data)); |
ddaa36e1 AS |
1754 | return 1; |
1755 | } | |
1756 | ||
1757 | return 0; | |
1758 | } | |
1759 | ||
db9f0278 | 1760 | static Lisp_Object |
7d47b580 | 1761 | find_handler_clause (Lisp_Object handlers, Lisp_Object conditions) |
db9f0278 JB |
1762 | { |
1763 | register Lisp_Object h; | |
db9f0278 | 1764 | |
f01cbfdd RS |
1765 | /* t is used by handlers for all conditions, set up by C code. */ |
1766 | if (EQ (handlers, Qt)) | |
db9f0278 | 1767 | return Qt; |
f01cbfdd | 1768 | |
61ede770 RS |
1769 | /* error is used similarly, but means print an error message |
1770 | and run the debugger if that is enabled. */ | |
e7f7fbaa SM |
1771 | if (EQ (handlers, Qerror)) |
1772 | return Qt; | |
f01cbfdd | 1773 | |
e7f7fbaa | 1774 | for (h = handlers; CONSP (h); h = XCDR (h)) |
db9f0278 | 1775 | { |
e7f7fbaa SM |
1776 | Lisp_Object handler = XCAR (h); |
1777 | Lisp_Object condit, tem; | |
5f96776a | 1778 | |
5f96776a | 1779 | if (!CONSP (handler)) |
db9f0278 | 1780 | continue; |
e7f7fbaa | 1781 | condit = XCAR (handler); |
5f96776a RS |
1782 | /* Handle a single condition name in handler HANDLER. */ |
1783 | if (SYMBOLP (condit)) | |
1784 | { | |
1785 | tem = Fmemq (Fcar (handler), conditions); | |
1786 | if (!NILP (tem)) | |
1787 | return handler; | |
1788 | } | |
1789 | /* Handle a list of condition names in handler HANDLER. */ | |
1790 | else if (CONSP (condit)) | |
1791 | { | |
f01cbfdd RS |
1792 | Lisp_Object tail; |
1793 | for (tail = condit; CONSP (tail); tail = XCDR (tail)) | |
5f96776a | 1794 | { |
e7f7fbaa | 1795 | tem = Fmemq (XCAR (tail), conditions); |
5f96776a | 1796 | if (!NILP (tem)) |
e7f7fbaa | 1797 | return handler; |
5f96776a RS |
1798 | } |
1799 | } | |
db9f0278 | 1800 | } |
f01cbfdd | 1801 | |
db9f0278 JB |
1802 | return Qnil; |
1803 | } | |
1804 | ||
db9f0278 | 1805 | |
f6d62986 | 1806 | /* Dump an error message; called like vprintf. */ |
db9f0278 | 1807 | void |
b3ffc17c | 1808 | verror (const char *m, va_list ap) |
db9f0278 | 1809 | { |
70476b54 | 1810 | char buf[4000]; |
c2d1e36d PE |
1811 | ptrdiff_t size = sizeof buf; |
1812 | ptrdiff_t size_max = STRING_BYTES_BOUND + 1; | |
9125da08 | 1813 | char *buffer = buf; |
c2d1e36d | 1814 | ptrdiff_t used; |
9125da08 RS |
1815 | Lisp_Object string; |
1816 | ||
d749b01b | 1817 | used = evxprintf (&buffer, &size, buf, size_max, m, ap); |
5fdb398c | 1818 | string = make_string (buffer, used); |
eb3f1cc8 | 1819 | if (buffer != buf) |
9ae6734f | 1820 | xfree (buffer); |
9125da08 | 1821 | |
734d55a2 | 1822 | xsignal1 (Qerror, string); |
db9f0278 | 1823 | } |
b3ffc17c DN |
1824 | |
1825 | ||
f6d62986 | 1826 | /* Dump an error message; called like printf. */ |
b3ffc17c DN |
1827 | |
1828 | /* VARARGS 1 */ | |
1829 | void | |
1830 | error (const char *m, ...) | |
1831 | { | |
1832 | va_list ap; | |
1833 | va_start (ap, m); | |
1834 | verror (m, ap); | |
b3ffc17c | 1835 | } |
db9f0278 | 1836 | \f |
a7ca3326 | 1837 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0, |
9dbc9081 PJ |
1838 | doc: /* Non-nil if FUNCTION makes provisions for interactive calling. |
1839 | This means it contains a description for how to read arguments to give it. | |
1840 | The value is nil for an invalid function or a symbol with no function | |
1841 | definition. | |
1842 | ||
1843 | Interactively callable functions include strings and vectors (treated | |
1844 | as keyboard macros), lambda-expressions that contain a top-level call | |
1845 | to `interactive', autoload definitions made by `autoload' with non-nil | |
1846 | fourth argument, and some of the built-in functions of Lisp. | |
1847 | ||
e72706be RS |
1848 | Also, a symbol satisfies `commandp' if its function definition does so. |
1849 | ||
1850 | If the optional argument FOR-CALL-INTERACTIVELY is non-nil, | |
769b4fb2 | 1851 | then strings and vectors are not accepted. */) |
5842a27b | 1852 | (Lisp_Object function, Lisp_Object for_call_interactively) |
db9f0278 JB |
1853 | { |
1854 | register Lisp_Object fun; | |
1855 | register Lisp_Object funcar; | |
52b71f49 | 1856 | Lisp_Object if_prop = Qnil; |
db9f0278 JB |
1857 | |
1858 | fun = function; | |
1859 | ||
eadf1faa SM |
1860 | fun = indirect_function (fun); /* Check cycles. */ |
1861 | if (NILP (fun)) | |
ffd56f97 | 1862 | return Qnil; |
db9f0278 | 1863 | |
52b71f49 | 1864 | /* Check an `interactive-form' property if present, analogous to the |
eadf1faa | 1865 | function-documentation property. */ |
52b71f49 SM |
1866 | fun = function; |
1867 | while (SYMBOLP (fun)) | |
1868 | { | |
2b9aa051 | 1869 | Lisp_Object tmp = Fget (fun, Qinteractive_form); |
52b71f49 SM |
1870 | if (!NILP (tmp)) |
1871 | if_prop = Qt; | |
1872 | fun = Fsymbol_function (fun); | |
1873 | } | |
1874 | ||
db9f0278 JB |
1875 | /* Emacs primitives are interactive if their DEFUN specifies an |
1876 | interactive spec. */ | |
90165123 | 1877 | if (SUBRP (fun)) |
04724b69 | 1878 | return XSUBR (fun)->intspec ? Qt : if_prop; |
db9f0278 JB |
1879 | |
1880 | /* Bytecode objects are interactive if they are long enough to | |
1881 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1882 | where the interactive spec is stored. */ | |
90165123 | 1883 | else if (COMPILEDP (fun)) |
845975f5 | 1884 | return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
52b71f49 | 1885 | ? Qt : if_prop); |
db9f0278 JB |
1886 | |
1887 | /* Strings and vectors are keyboard macros. */ | |
52b71f49 | 1888 | if (STRINGP (fun) || VECTORP (fun)) |
6e33efc4 | 1889 | return (NILP (for_call_interactively) ? Qt : Qnil); |
db9f0278 JB |
1890 | |
1891 | /* Lists may represent commands. */ | |
1892 | if (!CONSP (fun)) | |
1893 | return Qnil; | |
ed16fb98 | 1894 | funcar = XCAR (fun); |
b38b1ec0 | 1895 | if (EQ (funcar, Qclosure)) |
7200d79c SM |
1896 | return (!NILP (Fassq (Qinteractive, Fcdr (Fcdr (XCDR (fun))))) |
1897 | ? Qt : if_prop); | |
23aba0ea | 1898 | else if (EQ (funcar, Qlambda)) |
52b71f49 | 1899 | return !NILP (Fassq (Qinteractive, Fcdr (XCDR (fun)))) ? Qt : if_prop; |
b38b1ec0 | 1900 | else if (EQ (funcar, Qautoload)) |
52b71f49 | 1901 | return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun))))) ? Qt : if_prop; |
db9f0278 JB |
1902 | else |
1903 | return Qnil; | |
1904 | } | |
1905 | ||
db9f0278 | 1906 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, |
9dbc9081 PJ |
1907 | doc: /* Define FUNCTION to autoload from FILE. |
1908 | FUNCTION is a symbol; FILE is a file name string to pass to `load'. | |
1909 | Third arg DOCSTRING is documentation for the function. | |
1910 | Fourth arg INTERACTIVE if non-nil says function can be called interactively. | |
1911 | Fifth arg TYPE indicates the type of the object: | |
1912 | nil or omitted says FUNCTION is a function, | |
1913 | `keymap' says FUNCTION is really a keymap, and | |
1914 | `macro' or t says FUNCTION is really a macro. | |
1915 | Third through fifth args give info about the real definition. | |
1916 | They default to nil. | |
1917 | If FUNCTION is already defined other than as an autoload, | |
1918 | this does nothing and returns nil. */) | |
5842a27b | 1919 | (Lisp_Object function, Lisp_Object file, Lisp_Object docstring, Lisp_Object interactive, Lisp_Object type) |
db9f0278 | 1920 | { |
b7826503 PJ |
1921 | CHECK_SYMBOL (function); |
1922 | CHECK_STRING (file); | |
db9f0278 | 1923 | |
f6d62986 | 1924 | /* If function is defined and not as an autoload, don't override. */ |
eadf1faa | 1925 | if (!NILP (XSYMBOL (function)->function) |
32e5c58c | 1926 | && !AUTOLOADP (XSYMBOL (function)->function)) |
db9f0278 JB |
1927 | return Qnil; |
1928 | ||
32e5c58c | 1929 | if (!NILP (Vpurify_flag) && EQ (docstring, make_number (0))) |
61b108cc SM |
1930 | /* `read1' in lread.c has found the docstring starting with "\ |
1931 | and assumed the docstring will be provided by Snarf-documentation, so it | |
1932 | passed us 0 instead. But that leads to accidental sharing in purecopy's | |
1933 | hash-consing, so we use a (hopefully) unique integer instead. */ | |
32e5c58c SM |
1934 | docstring = make_number (XHASH (function)); |
1935 | return Fdefalias (function, | |
1936 | list5 (Qautoload, file, docstring, interactive, type), | |
1937 | Qnil); | |
db9f0278 JB |
1938 | } |
1939 | ||
27e498e6 | 1940 | void |
d3da34e0 | 1941 | un_autoload (Lisp_Object oldqueue) |
db9f0278 | 1942 | { |
27e498e6 | 1943 | Lisp_Object queue, first, second; |
db9f0278 JB |
1944 | |
1945 | /* Queue to unwind is current value of Vautoload_queue. | |
1946 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1947 | queue = Vautoload_queue; | |
1948 | Vautoload_queue = oldqueue; | |
1949 | while (CONSP (queue)) | |
1950 | { | |
e509f168 | 1951 | first = XCAR (queue); |
db9f0278 JB |
1952 | second = Fcdr (first); |
1953 | first = Fcar (first); | |
47b82df9 RS |
1954 | if (EQ (first, make_number (0))) |
1955 | Vfeatures = second; | |
db9f0278 JB |
1956 | else |
1957 | Ffset (first, second); | |
e509f168 | 1958 | queue = XCDR (queue); |
db9f0278 | 1959 | } |
db9f0278 JB |
1960 | } |
1961 | ||
ca20916b RS |
1962 | /* Load an autoloaded function. |
1963 | FUNNAME is the symbol which is the function's name. | |
1964 | FUNDEF is the autoload definition (a list). */ | |
1965 | ||
7abaf5cc SM |
1966 | DEFUN ("autoload-do-load", Fautoload_do_load, Sautoload_do_load, 1, 3, 0, |
1967 | doc: /* Load FUNDEF which should be an autoload. | |
1968 | If non-nil, FUNNAME should be the symbol whose function value is FUNDEF, | |
1969 | in which case the function returns the new autoloaded function value. | |
1970 | If equal to `macro', MACRO-ONLY specifies that FUNDEF should only be loaded if | |
1971 | it is defines a macro. */) | |
1972 | (Lisp_Object fundef, Lisp_Object funname, Lisp_Object macro_only) | |
db9f0278 | 1973 | { |
d311d28c | 1974 | ptrdiff_t count = SPECPDL_INDEX (); |
ca20916b | 1975 | struct gcpro gcpro1, gcpro2, gcpro3; |
db9f0278 | 1976 | |
7abaf5cc SM |
1977 | if (!CONSP (fundef) || !EQ (Qautoload, XCAR (fundef))) |
1978 | return fundef; | |
1979 | ||
1980 | if (EQ (macro_only, Qmacro)) | |
1981 | { | |
1982 | Lisp_Object kind = Fnth (make_number (4), fundef); | |
1983 | if (! (EQ (kind, Qt) || EQ (kind, Qmacro))) | |
1984 | return fundef; | |
1985 | } | |
1986 | ||
aea6173f RS |
1987 | /* This is to make sure that loadup.el gives a clear picture |
1988 | of what files are preloaded and when. */ | |
ab4db096 RS |
1989 | if (! NILP (Vpurify_flag)) |
1990 | error ("Attempt to autoload %s while preparing to dump", | |
d5db4077 | 1991 | SDATA (SYMBOL_NAME (funname))); |
ab4db096 | 1992 | |
b7826503 | 1993 | CHECK_SYMBOL (funname); |
7abaf5cc | 1994 | GCPRO3 (funname, fundef, macro_only); |
db9f0278 | 1995 | |
f87740dc | 1996 | /* Preserve the match data. */ |
89f2614d | 1997 | record_unwind_save_match_data (); |
177c0ea7 | 1998 | |
a04ee161 RS |
1999 | /* If autoloading gets an error (which includes the error of failing |
2000 | to define the function being called), we use Vautoload_queue | |
2001 | to undo function definitions and `provide' calls made by | |
2002 | the function. We do this in the specific case of autoloading | |
2003 | because autoloading is not an explicit request "load this file", | |
2004 | but rather a request to "call this function". | |
d3da34e0 | 2005 | |
a04ee161 | 2006 | The value saved here is to be restored into Vautoload_queue. */ |
db9f0278 JB |
2007 | record_unwind_protect (un_autoload, Vautoload_queue); |
2008 | Vautoload_queue = Qt; | |
7abaf5cc SM |
2009 | /* If `macro_only', assume this autoload to be a "best-effort", |
2010 | so don't signal an error if autoloading fails. */ | |
2011 | Fload (Fcar (Fcdr (fundef)), macro_only, Qt, Qnil, Qt); | |
2a49b6e5 | 2012 | |
db9f0278 JB |
2013 | /* Once loading finishes, don't undo it. */ |
2014 | Vautoload_queue = Qt; | |
2015 | unbind_to (count, Qnil); | |
2016 | ||
ca20916b | 2017 | UNGCPRO; |
7abaf5cc SM |
2018 | |
2019 | if (NILP (funname)) | |
2020 | return Qnil; | |
2021 | else | |
2022 | { | |
2023 | Lisp_Object fun = Findirect_function (funname, Qnil); | |
2024 | ||
2025 | if (!NILP (Fequal (fun, fundef))) | |
2026 | error ("Autoloading failed to define function %s", | |
2027 | SDATA (SYMBOL_NAME (funname))); | |
2028 | else | |
2029 | return fun; | |
2030 | } | |
db9f0278 | 2031 | } |
4c576a83 | 2032 | |
db9f0278 | 2033 | \f |
a7ca3326 | 2034 | DEFUN ("eval", Feval, Seval, 1, 2, 0, |
a0ee6f27 SM |
2035 | doc: /* Evaluate FORM and return its value. |
2036 | If LEXICAL is t, evaluate using lexical scoping. */) | |
2037 | (Lisp_Object form, Lisp_Object lexical) | |
defb1411 | 2038 | { |
d311d28c | 2039 | ptrdiff_t count = SPECPDL_INDEX (); |
a0ee6f27 | 2040 | specbind (Qinternal_interpreter_environment, |
6c6f1994 | 2041 | CONSP (lexical) || NILP (lexical) ? lexical : list1 (Qt)); |
defb1411 SM |
2042 | return unbind_to (count, eval_sub (form)); |
2043 | } | |
2044 | ||
5e301d76 PE |
2045 | /* Grow the specpdl stack by one entry. |
2046 | The caller should have already initialized the entry. | |
2047 | Signal an error on stack overflow. | |
2048 | ||
2049 | Make sure that there is always one unused entry past the top of the | |
2050 | stack, so that the just-initialized entry is safely unwound if | |
2051 | memory exhausted and an error is signaled here. Also, allocate a | |
2052 | never-used entry just before the bottom of the stack; sometimes its | |
2053 | address is taken. */ | |
2054 | ||
2f592f95 SM |
2055 | static void |
2056 | grow_specpdl (void) | |
2057 | { | |
5e301d76 PE |
2058 | specpdl_ptr++; |
2059 | ||
2060 | if (specpdl_ptr == specpdl + specpdl_size) | |
2f592f95 | 2061 | { |
5e301d76 PE |
2062 | ptrdiff_t count = SPECPDL_INDEX (); |
2063 | ptrdiff_t max_size = min (max_specpdl_size, PTRDIFF_MAX - 1000); | |
2064 | union specbinding *pdlvec = specpdl - 1; | |
2065 | ptrdiff_t pdlvecsize = specpdl_size + 1; | |
2f592f95 | 2066 | if (max_size <= specpdl_size) |
5e301d76 PE |
2067 | { |
2068 | if (max_specpdl_size < 400) | |
2069 | max_size = max_specpdl_size = 400; | |
2070 | if (max_size <= specpdl_size) | |
2071 | signal_error ("Variable binding depth exceeds max-specpdl-size", | |
2072 | Qnil); | |
2073 | } | |
2074 | pdlvec = xpalloc (pdlvec, &pdlvecsize, 1, max_size + 1, sizeof *specpdl); | |
2075 | specpdl = pdlvec + 1; | |
2076 | specpdl_size = pdlvecsize - 1; | |
2077 | specpdl_ptr = specpdl + count; | |
2f592f95 | 2078 | } |
2f592f95 SM |
2079 | } |
2080 | ||
3d5ee10a | 2081 | void |
2f592f95 SM |
2082 | record_in_backtrace (Lisp_Object function, Lisp_Object *args, ptrdiff_t nargs) |
2083 | { | |
2084 | eassert (nargs >= UNEVALLED); | |
9349e5f7 PE |
2085 | specpdl_ptr->bt.kind = SPECPDL_BACKTRACE; |
2086 | specpdl_ptr->bt.debug_on_exit = false; | |
2087 | specpdl_ptr->bt.function = function; | |
2088 | specpdl_ptr->bt.args = args; | |
2089 | specpdl_ptr->bt.nargs = nargs; | |
5e301d76 | 2090 | grow_specpdl (); |
2f592f95 SM |
2091 | } |
2092 | ||
defb1411 SM |
2093 | /* Eval a sub-expression of the current expression (i.e. in the same |
2094 | lexical scope). */ | |
2095 | Lisp_Object | |
2096 | eval_sub (Lisp_Object form) | |
db9f0278 JB |
2097 | { |
2098 | Lisp_Object fun, val, original_fun, original_args; | |
2099 | Lisp_Object funcar; | |
db9f0278 JB |
2100 | struct gcpro gcpro1, gcpro2, gcpro3; |
2101 | ||
90165123 | 2102 | if (SYMBOLP (form)) |
b9598260 | 2103 | { |
f07a954e SM |
2104 | /* Look up its binding in the lexical environment. |
2105 | We do not pay attention to the declared_special flag here, since we | |
2106 | already did that when let-binding the variable. */ | |
2107 | Lisp_Object lex_binding | |
2108 | = !NILP (Vinternal_interpreter_environment) /* Mere optimization! */ | |
2109 | ? Fassq (form, Vinternal_interpreter_environment) | |
2110 | : Qnil; | |
2111 | if (CONSP (lex_binding)) | |
2112 | return XCDR (lex_binding); | |
2113 | else | |
2114 | return Fsymbol_value (form); | |
b9598260 SM |
2115 | } |
2116 | ||
db9f0278 JB |
2117 | if (!CONSP (form)) |
2118 | return form; | |
2119 | ||
2120 | QUIT; | |
9d5a1260 DA |
2121 | |
2122 | GCPRO1 (form); | |
765e61e3 | 2123 | maybe_gc (); |
9d5a1260 | 2124 | UNGCPRO; |
db9f0278 JB |
2125 | |
2126 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2127 | { | |
2128 | if (max_lisp_eval_depth < 100) | |
2129 | max_lisp_eval_depth = 100; | |
2130 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2131 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2132 | } |
2133 | ||
7d7bbefd DA |
2134 | original_fun = XCAR (form); |
2135 | original_args = XCDR (form); | |
db9f0278 | 2136 | |
2f592f95 SM |
2137 | /* This also protects them from gc. */ |
2138 | record_in_backtrace (original_fun, &original_args, UNEVALLED); | |
db9f0278 JB |
2139 | |
2140 | if (debug_on_next_call) | |
2141 | do_debug_on_call (Qt); | |
2142 | ||
2143 | /* At this point, only original_fun and original_args | |
f6d62986 | 2144 | have values that will be used below. */ |
db9f0278 | 2145 | retry: |
8788120f KS |
2146 | |
2147 | /* Optimize for no indirection. */ | |
2148 | fun = original_fun; | |
eadf1faa | 2149 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2150 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2151 | fun = indirect_function (fun); |
db9f0278 | 2152 | |
90165123 | 2153 | if (SUBRP (fun)) |
db9f0278 JB |
2154 | { |
2155 | Lisp_Object numargs; | |
166c822d | 2156 | Lisp_Object argvals[8]; |
db9f0278 JB |
2157 | Lisp_Object args_left; |
2158 | register int i, maxargs; | |
2159 | ||
2160 | args_left = original_args; | |
2161 | numargs = Flength (args_left); | |
2162 | ||
7e63e0c3 | 2163 | check_cons_list (); |
c1788fbc | 2164 | |
f6d62986 SM |
2165 | if (XINT (numargs) < XSUBR (fun)->min_args |
2166 | || (XSUBR (fun)->max_args >= 0 | |
2167 | && XSUBR (fun)->max_args < XINT (numargs))) | |
734d55a2 | 2168 | xsignal2 (Qwrong_number_of_arguments, original_fun, numargs); |
db9f0278 | 2169 | |
ef1b0ba7 | 2170 | else if (XSUBR (fun)->max_args == UNEVALLED) |
bbc6b304 | 2171 | val = (XSUBR (fun)->function.aUNEVALLED) (args_left); |
ef1b0ba7 | 2172 | else if (XSUBR (fun)->max_args == MANY) |
db9f0278 | 2173 | { |
f6d62986 | 2174 | /* Pass a vector of evaluated arguments. */ |
db9f0278 | 2175 | Lisp_Object *vals; |
f66c7cf8 | 2176 | ptrdiff_t argnum = 0; |
3a7a9129 | 2177 | USE_SAFE_ALLOCA; |
db9f0278 | 2178 | |
b72e0717 | 2179 | SAFE_ALLOCA_LISP (vals, XINT (numargs)); |
db9f0278 JB |
2180 | |
2181 | GCPRO3 (args_left, fun, fun); | |
2182 | gcpro3.var = vals; | |
2183 | gcpro3.nvars = 0; | |
2184 | ||
265a9e55 | 2185 | while (!NILP (args_left)) |
db9f0278 | 2186 | { |
defb1411 | 2187 | vals[argnum++] = eval_sub (Fcar (args_left)); |
db9f0278 JB |
2188 | args_left = Fcdr (args_left); |
2189 | gcpro3.nvars = argnum; | |
2190 | } | |
db9f0278 | 2191 | |
2f592f95 SM |
2192 | set_backtrace_args (specpdl_ptr - 1, vals); |
2193 | set_backtrace_nargs (specpdl_ptr - 1, XINT (numargs)); | |
db9f0278 | 2194 | |
d5273788 | 2195 | val = (XSUBR (fun)->function.aMANY) (XINT (numargs), vals); |
a6e3fa71 | 2196 | UNGCPRO; |
3a7a9129 | 2197 | SAFE_FREE (); |
db9f0278 | 2198 | } |
ef1b0ba7 | 2199 | else |
db9f0278 | 2200 | { |
ef1b0ba7 SM |
2201 | GCPRO3 (args_left, fun, fun); |
2202 | gcpro3.var = argvals; | |
2203 | gcpro3.nvars = 0; | |
db9f0278 | 2204 | |
ef1b0ba7 SM |
2205 | maxargs = XSUBR (fun)->max_args; |
2206 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
2207 | { | |
a0ee6f27 | 2208 | argvals[i] = eval_sub (Fcar (args_left)); |
ef1b0ba7 SM |
2209 | gcpro3.nvars = ++i; |
2210 | } | |
db9f0278 | 2211 | |
ef1b0ba7 | 2212 | UNGCPRO; |
db9f0278 | 2213 | |
2f592f95 SM |
2214 | set_backtrace_args (specpdl_ptr - 1, argvals); |
2215 | set_backtrace_nargs (specpdl_ptr - 1, XINT (numargs)); | |
ef1b0ba7 SM |
2216 | |
2217 | switch (i) | |
2218 | { | |
2219 | case 0: | |
2220 | val = (XSUBR (fun)->function.a0 ()); | |
2221 | break; | |
2222 | case 1: | |
2223 | val = (XSUBR (fun)->function.a1 (argvals[0])); | |
2224 | break; | |
2225 | case 2: | |
2226 | val = (XSUBR (fun)->function.a2 (argvals[0], argvals[1])); | |
2227 | break; | |
2228 | case 3: | |
2229 | val = (XSUBR (fun)->function.a3 | |
2230 | (argvals[0], argvals[1], argvals[2])); | |
2231 | break; | |
2232 | case 4: | |
2233 | val = (XSUBR (fun)->function.a4 | |
2234 | (argvals[0], argvals[1], argvals[2], argvals[3])); | |
2235 | break; | |
2236 | case 5: | |
2237 | val = (XSUBR (fun)->function.a5 | |
2238 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2239 | argvals[4])); | |
2240 | break; | |
2241 | case 6: | |
2242 | val = (XSUBR (fun)->function.a6 | |
2243 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2244 | argvals[4], argvals[5])); | |
2245 | break; | |
2246 | case 7: | |
2247 | val = (XSUBR (fun)->function.a7 | |
2248 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2249 | argvals[4], argvals[5], argvals[6])); | |
2250 | break; | |
2251 | ||
2252 | case 8: | |
2253 | val = (XSUBR (fun)->function.a8 | |
2254 | (argvals[0], argvals[1], argvals[2], argvals[3], | |
2255 | argvals[4], argvals[5], argvals[6], argvals[7])); | |
2256 | break; | |
2257 | ||
2258 | default: | |
2259 | /* Someone has created a subr that takes more arguments than | |
2260 | is supported by this code. We need to either rewrite the | |
2261 | subr to use a different argument protocol, or add more | |
2262 | cases to this switch. */ | |
1088b922 | 2263 | emacs_abort (); |
ef1b0ba7 | 2264 | } |
db9f0278 JB |
2265 | } |
2266 | } | |
ef1b0ba7 | 2267 | else if (COMPILEDP (fun)) |
defb1411 | 2268 | val = apply_lambda (fun, original_args); |
db9f0278 JB |
2269 | else |
2270 | { | |
eadf1faa | 2271 | if (NILP (fun)) |
734d55a2 | 2272 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2273 | if (!CONSP (fun)) |
734d55a2 KS |
2274 | xsignal1 (Qinvalid_function, original_fun); |
2275 | funcar = XCAR (fun); | |
90165123 | 2276 | if (!SYMBOLP (funcar)) |
734d55a2 | 2277 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 JB |
2278 | if (EQ (funcar, Qautoload)) |
2279 | { | |
7abaf5cc | 2280 | Fautoload_do_load (fun, original_fun, Qnil); |
db9f0278 JB |
2281 | goto retry; |
2282 | } | |
2283 | if (EQ (funcar, Qmacro)) | |
8be3a09c SM |
2284 | { |
2285 | ptrdiff_t count = SPECPDL_INDEX (); | |
8be3a09c SM |
2286 | Lisp_Object exp; |
2287 | /* Bind lexical-binding during expansion of the macro, so the | |
2288 | macro can know reliably if the code it outputs will be | |
2289 | interpreted using lexical-binding or not. */ | |
2290 | specbind (Qlexical_binding, | |
2291 | NILP (Vinternal_interpreter_environment) ? Qnil : Qt); | |
2292 | exp = apply1 (Fcdr (fun), original_args); | |
2293 | unbind_to (count, Qnil); | |
2294 | val = eval_sub (exp); | |
2295 | } | |
defb1411 SM |
2296 | else if (EQ (funcar, Qlambda) |
2297 | || EQ (funcar, Qclosure)) | |
2298 | val = apply_lambda (fun, original_args); | |
db9f0278 | 2299 | else |
734d55a2 | 2300 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2301 | } |
7e63e0c3 | 2302 | check_cons_list (); |
c1788fbc | 2303 | |
db9f0278 | 2304 | lisp_eval_depth--; |
2f592f95 | 2305 | if (backtrace_debug_on_exit (specpdl_ptr - 1)) |
6c6f1994 | 2306 | val = call_debugger (list2 (Qexit, val)); |
2f592f95 | 2307 | specpdl_ptr--; |
824eb35e | 2308 | |
db9f0278 JB |
2309 | return val; |
2310 | } | |
2311 | \f | |
8edd4a2b | 2312 | DEFUN ("apply", Fapply, Sapply, 1, MANY, 0, |
9dbc9081 PJ |
2313 | doc: /* Call FUNCTION with our remaining args, using our last arg as list of args. |
2314 | Then return the value FUNCTION returns. | |
2315 | Thus, (apply '+ 1 2 '(3 4)) returns 10. | |
2316 | usage: (apply FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2317 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2318 | { |
d311d28c PE |
2319 | ptrdiff_t i; |
2320 | EMACS_INT numargs; | |
db9f0278 JB |
2321 | register Lisp_Object spread_arg; |
2322 | register Lisp_Object *funcall_args; | |
3a7a9129 | 2323 | Lisp_Object fun, retval; |
96d44c64 | 2324 | struct gcpro gcpro1; |
3a7a9129 | 2325 | USE_SAFE_ALLOCA; |
db9f0278 JB |
2326 | |
2327 | fun = args [0]; | |
2328 | funcall_args = 0; | |
2329 | spread_arg = args [nargs - 1]; | |
b7826503 | 2330 | CHECK_LIST (spread_arg); |
177c0ea7 | 2331 | |
db9f0278 JB |
2332 | numargs = XINT (Flength (spread_arg)); |
2333 | ||
2334 | if (numargs == 0) | |
2335 | return Ffuncall (nargs - 1, args); | |
2336 | else if (numargs == 1) | |
2337 | { | |
03699b14 | 2338 | args [nargs - 1] = XCAR (spread_arg); |
db9f0278 JB |
2339 | return Ffuncall (nargs, args); |
2340 | } | |
2341 | ||
a6e3fa71 | 2342 | numargs += nargs - 2; |
db9f0278 | 2343 | |
8788120f | 2344 | /* Optimize for no indirection. */ |
eadf1faa | 2345 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2346 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2347 | fun = indirect_function (fun); |
eadf1faa | 2348 | if (NILP (fun)) |
db9f0278 | 2349 | { |
f6d62986 | 2350 | /* Let funcall get the error. */ |
ffd56f97 JB |
2351 | fun = args[0]; |
2352 | goto funcall; | |
db9f0278 JB |
2353 | } |
2354 | ||
90165123 | 2355 | if (SUBRP (fun)) |
db9f0278 JB |
2356 | { |
2357 | if (numargs < XSUBR (fun)->min_args | |
2358 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
f6d62986 | 2359 | goto funcall; /* Let funcall get the error. */ |
c5101a77 | 2360 | else if (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args > numargs) |
db9f0278 JB |
2361 | { |
2362 | /* Avoid making funcall cons up a yet another new vector of arguments | |
f6d62986 | 2363 | by explicitly supplying nil's for optional values. */ |
b72e0717 | 2364 | SAFE_ALLOCA_LISP (funcall_args, 1 + XSUBR (fun)->max_args); |
db9f0278 JB |
2365 | for (i = numargs; i < XSUBR (fun)->max_args;) |
2366 | funcall_args[++i] = Qnil; | |
96d44c64 SM |
2367 | GCPRO1 (*funcall_args); |
2368 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
2369 | } |
2370 | } | |
2371 | funcall: | |
2372 | /* We add 1 to numargs because funcall_args includes the | |
2373 | function itself as well as its arguments. */ | |
2374 | if (!funcall_args) | |
a6e3fa71 | 2375 | { |
b72e0717 | 2376 | SAFE_ALLOCA_LISP (funcall_args, 1 + numargs); |
96d44c64 SM |
2377 | GCPRO1 (*funcall_args); |
2378 | gcpro1.nvars = 1 + numargs; | |
a6e3fa71 JB |
2379 | } |
2380 | ||
663e2b3f | 2381 | memcpy (funcall_args, args, nargs * word_size); |
db9f0278 JB |
2382 | /* Spread the last arg we got. Its first element goes in |
2383 | the slot that it used to occupy, hence this value of I. */ | |
2384 | i = nargs - 1; | |
265a9e55 | 2385 | while (!NILP (spread_arg)) |
db9f0278 | 2386 | { |
03699b14 KR |
2387 | funcall_args [i++] = XCAR (spread_arg); |
2388 | spread_arg = XCDR (spread_arg); | |
db9f0278 | 2389 | } |
a6e3fa71 | 2390 | |
96d44c64 | 2391 | /* By convention, the caller needs to gcpro Ffuncall's args. */ |
3a7a9129 CY |
2392 | retval = Ffuncall (gcpro1.nvars, funcall_args); |
2393 | UNGCPRO; | |
2394 | SAFE_FREE (); | |
2395 | ||
2396 | return retval; | |
db9f0278 JB |
2397 | } |
2398 | \f | |
ff936e53 SM |
2399 | /* Run hook variables in various ways. */ |
2400 | ||
f6d62986 | 2401 | static Lisp_Object |
f66c7cf8 | 2402 | funcall_nil (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2403 | { |
2404 | Ffuncall (nargs, args); | |
2405 | return Qnil; | |
2406 | } | |
ff936e53 | 2407 | |
a7ca3326 | 2408 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0, |
9f685258 | 2409 | doc: /* Run each hook in HOOKS. |
9dbc9081 PJ |
2410 | Each argument should be a symbol, a hook variable. |
2411 | These symbols are processed in the order specified. | |
2412 | If a hook symbol has a non-nil value, that value may be a function | |
2413 | or a list of functions to be called to run the hook. | |
2414 | If the value is a function, it is called with no arguments. | |
2415 | If it is a list, the elements are called, in order, with no arguments. | |
2416 | ||
9f685258 LK |
2417 | Major modes should not use this function directly to run their mode |
2418 | hook; they should use `run-mode-hooks' instead. | |
2419 | ||
72e85d5d RS |
2420 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2421 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2422 | usage: (run-hooks &rest HOOKS) */) |
f66c7cf8 | 2423 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 SM |
2424 | { |
2425 | Lisp_Object hook[1]; | |
f66c7cf8 | 2426 | ptrdiff_t i; |
ff936e53 SM |
2427 | |
2428 | for (i = 0; i < nargs; i++) | |
2429 | { | |
2430 | hook[0] = args[i]; | |
f6d62986 | 2431 | run_hook_with_args (1, hook, funcall_nil); |
ff936e53 SM |
2432 | } |
2433 | ||
2434 | return Qnil; | |
2435 | } | |
177c0ea7 | 2436 | |
a7ca3326 | 2437 | DEFUN ("run-hook-with-args", Frun_hook_with_args, |
9dbc9081 PJ |
2438 | Srun_hook_with_args, 1, MANY, 0, |
2439 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2440 | HOOK should be a symbol, a hook variable. The value of HOOK |
2441 | may be nil, a function, or a list of functions. Call each | |
2442 | function in order with arguments ARGS. The final return value | |
2443 | is unspecified. | |
9dbc9081 | 2444 | |
72e85d5d RS |
2445 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2446 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2447 | usage: (run-hook-with-args HOOK &rest ARGS) */) |
f66c7cf8 | 2448 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2449 | { |
f6d62986 | 2450 | return run_hook_with_args (nargs, args, funcall_nil); |
ff936e53 SM |
2451 | } |
2452 | ||
d393cefb GM |
2453 | /* NB this one still documents a specific non-nil return value. |
2454 | (As did run-hook-with-args and run-hook-with-args-until-failure | |
2455 | until they were changed in 24.1.) */ | |
a0d76c27 | 2456 | DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success, |
9dbc9081 PJ |
2457 | Srun_hook_with_args_until_success, 1, MANY, 0, |
2458 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2459 | HOOK should be a symbol, a hook variable. The value of HOOK |
2460 | may be nil, a function, or a list of functions. Call each | |
2461 | function in order with arguments ARGS, stopping at the first | |
2462 | one that returns non-nil, and return that value. Otherwise (if | |
2463 | all functions return nil, or if there are no functions to call), | |
2464 | return nil. | |
9dbc9081 | 2465 | |
72e85d5d RS |
2466 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2467 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2468 | usage: (run-hook-with-args-until-success HOOK &rest ARGS) */) |
f66c7cf8 | 2469 | (ptrdiff_t nargs, Lisp_Object *args) |
b0b667cb | 2470 | { |
f6d62986 SM |
2471 | return run_hook_with_args (nargs, args, Ffuncall); |
2472 | } | |
2473 | ||
2474 | static Lisp_Object | |
f66c7cf8 | 2475 | funcall_not (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2476 | { |
2477 | return NILP (Ffuncall (nargs, args)) ? Qt : Qnil; | |
ff936e53 SM |
2478 | } |
2479 | ||
a7ca3326 | 2480 | DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure, |
9dbc9081 PJ |
2481 | Srun_hook_with_args_until_failure, 1, MANY, 0, |
2482 | doc: /* Run HOOK with the specified arguments ARGS. | |
d393cefb GM |
2483 | HOOK should be a symbol, a hook variable. The value of HOOK |
2484 | may be nil, a function, or a list of functions. Call each | |
2485 | function in order with arguments ARGS, stopping at the first | |
2486 | one that returns nil, and return nil. Otherwise (if all functions | |
2487 | return non-nil, or if there are no functions to call), return non-nil | |
2488 | \(do not rely on the precise return value in this case). | |
9dbc9081 | 2489 | |
72e85d5d RS |
2490 | Do not use `make-local-variable' to make a hook variable buffer-local. |
2491 | Instead, use `add-hook' and specify t for the LOCAL argument. | |
9dbc9081 | 2492 | usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */) |
f66c7cf8 | 2493 | (ptrdiff_t nargs, Lisp_Object *args) |
ff936e53 | 2494 | { |
f6d62986 | 2495 | return NILP (run_hook_with_args (nargs, args, funcall_not)) ? Qt : Qnil; |
ff936e53 SM |
2496 | } |
2497 | ||
f6d62986 | 2498 | static Lisp_Object |
f66c7cf8 | 2499 | run_hook_wrapped_funcall (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2500 | { |
2501 | Lisp_Object tmp = args[0], ret; | |
2502 | args[0] = args[1]; | |
2503 | args[1] = tmp; | |
2504 | ret = Ffuncall (nargs, args); | |
2505 | args[1] = args[0]; | |
2506 | args[0] = tmp; | |
2507 | return ret; | |
2508 | } | |
2509 | ||
2510 | DEFUN ("run-hook-wrapped", Frun_hook_wrapped, Srun_hook_wrapped, 2, MANY, 0, | |
2511 | doc: /* Run HOOK, passing each function through WRAP-FUNCTION. | |
2512 | I.e. instead of calling each function FUN directly with arguments ARGS, | |
2513 | it calls WRAP-FUNCTION with arguments FUN and ARGS. | |
2514 | As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped' | |
2515 | aborts and returns that value. | |
2516 | usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */) | |
f66c7cf8 | 2517 | (ptrdiff_t nargs, Lisp_Object *args) |
f6d62986 SM |
2518 | { |
2519 | return run_hook_with_args (nargs, args, run_hook_wrapped_funcall); | |
2520 | } | |
ff936e53 | 2521 | |
c933ea05 RS |
2522 | /* ARGS[0] should be a hook symbol. |
2523 | Call each of the functions in the hook value, passing each of them | |
2524 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
f6d62986 | 2525 | FUNCALL specifies how to call each function on the hook. |
c933ea05 RS |
2526 | The caller (or its caller, etc) must gcpro all of ARGS, |
2527 | except that it isn't necessary to gcpro ARGS[0]. */ | |
2528 | ||
f6d62986 | 2529 | Lisp_Object |
f66c7cf8 PE |
2530 | run_hook_with_args (ptrdiff_t nargs, Lisp_Object *args, |
2531 | Lisp_Object (*funcall) (ptrdiff_t nargs, Lisp_Object *args)) | |
ff936e53 | 2532 | { |
f6d62986 | 2533 | Lisp_Object sym, val, ret = Qnil; |
fada05d6 | 2534 | struct gcpro gcpro1, gcpro2, gcpro3; |
b0b667cb | 2535 | |
f029ca5f RS |
2536 | /* If we are dying or still initializing, |
2537 | don't do anything--it would probably crash if we tried. */ | |
2538 | if (NILP (Vrun_hooks)) | |
caff32a7 | 2539 | return Qnil; |
f029ca5f | 2540 | |
b0b667cb | 2541 | sym = args[0]; |
aa681b51 | 2542 | val = find_symbol_value (sym); |
ff936e53 | 2543 | |
b0b667cb | 2544 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 2545 | return ret; |
03699b14 | 2546 | else if (!CONSP (val) || EQ (XCAR (val), Qlambda)) |
b0b667cb KH |
2547 | { |
2548 | args[0] = val; | |
f6d62986 | 2549 | return funcall (nargs, args); |
b0b667cb KH |
2550 | } |
2551 | else | |
2552 | { | |
1faed8ae PE |
2553 | Lisp_Object global_vals = Qnil; |
2554 | GCPRO3 (sym, val, global_vals); | |
cb9d21f8 | 2555 | |
ff936e53 | 2556 | for (; |
f6d62986 | 2557 | CONSP (val) && NILP (ret); |
03699b14 | 2558 | val = XCDR (val)) |
b0b667cb | 2559 | { |
03699b14 | 2560 | if (EQ (XCAR (val), Qt)) |
b0b667cb KH |
2561 | { |
2562 | /* t indicates this hook has a local binding; | |
2563 | it means to run the global binding too. */ | |
1faed8ae PE |
2564 | global_vals = Fdefault_value (sym); |
2565 | if (NILP (global_vals)) continue; | |
b0b667cb | 2566 | |
1faed8ae | 2567 | if (!CONSP (global_vals) || EQ (XCAR (global_vals), Qlambda)) |
b0b667cb | 2568 | { |
1faed8ae | 2569 | args[0] = global_vals; |
f6d62986 | 2570 | ret = funcall (nargs, args); |
8932b1c2 CY |
2571 | } |
2572 | else | |
2573 | { | |
2574 | for (; | |
f6d62986 | 2575 | CONSP (global_vals) && NILP (ret); |
1faed8ae | 2576 | global_vals = XCDR (global_vals)) |
8932b1c2 | 2577 | { |
1faed8ae | 2578 | args[0] = XCAR (global_vals); |
8932b1c2 CY |
2579 | /* In a global value, t should not occur. If it does, we |
2580 | must ignore it to avoid an endless loop. */ | |
2581 | if (!EQ (args[0], Qt)) | |
f6d62986 | 2582 | ret = funcall (nargs, args); |
8932b1c2 | 2583 | } |
b0b667cb KH |
2584 | } |
2585 | } | |
2586 | else | |
2587 | { | |
03699b14 | 2588 | args[0] = XCAR (val); |
f6d62986 | 2589 | ret = funcall (nargs, args); |
b0b667cb KH |
2590 | } |
2591 | } | |
cb9d21f8 RS |
2592 | |
2593 | UNGCPRO; | |
ff936e53 | 2594 | return ret; |
b0b667cb KH |
2595 | } |
2596 | } | |
c933ea05 | 2597 | |
7d48558f RS |
2598 | /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */ |
2599 | ||
2600 | void | |
d3da34e0 | 2601 | run_hook_with_args_2 (Lisp_Object hook, Lisp_Object arg1, Lisp_Object arg2) |
7d48558f RS |
2602 | { |
2603 | Lisp_Object temp[3]; | |
2604 | temp[0] = hook; | |
2605 | temp[1] = arg1; | |
2606 | temp[2] = arg2; | |
2607 | ||
2608 | Frun_hook_with_args (3, temp); | |
2609 | } | |
ff936e53 | 2610 | \f |
f6d62986 | 2611 | /* Apply fn to arg. */ |
db9f0278 | 2612 | Lisp_Object |
d3da34e0 | 2613 | apply1 (Lisp_Object fn, Lisp_Object arg) |
db9f0278 | 2614 | { |
a6e3fa71 JB |
2615 | struct gcpro gcpro1; |
2616 | ||
2617 | GCPRO1 (fn); | |
265a9e55 | 2618 | if (NILP (arg)) |
a6e3fa71 JB |
2619 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2620 | gcpro1.nvars = 2; | |
db9f0278 JB |
2621 | { |
2622 | Lisp_Object args[2]; | |
2623 | args[0] = fn; | |
2624 | args[1] = arg; | |
a6e3fa71 JB |
2625 | gcpro1.var = args; |
2626 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 | 2627 | } |
db9f0278 JB |
2628 | } |
2629 | ||
f6d62986 | 2630 | /* Call function fn on no arguments. */ |
db9f0278 | 2631 | Lisp_Object |
d3da34e0 | 2632 | call0 (Lisp_Object fn) |
db9f0278 | 2633 | { |
a6e3fa71 JB |
2634 | struct gcpro gcpro1; |
2635 | ||
2636 | GCPRO1 (fn); | |
2637 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2638 | } |
2639 | ||
f6d62986 | 2640 | /* Call function fn with 1 argument arg1. */ |
db9f0278 JB |
2641 | /* ARGSUSED */ |
2642 | Lisp_Object | |
d3da34e0 | 2643 | call1 (Lisp_Object fn, Lisp_Object arg1) |
db9f0278 | 2644 | { |
a6e3fa71 | 2645 | struct gcpro gcpro1; |
177c0ea7 | 2646 | Lisp_Object args[2]; |
a6e3fa71 | 2647 | |
db9f0278 | 2648 | args[0] = fn; |
15285f9f | 2649 | args[1] = arg1; |
a6e3fa71 JB |
2650 | GCPRO1 (args[0]); |
2651 | gcpro1.nvars = 2; | |
2652 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 JB |
2653 | } |
2654 | ||
f6d62986 | 2655 | /* Call function fn with 2 arguments arg1, arg2. */ |
db9f0278 JB |
2656 | /* ARGSUSED */ |
2657 | Lisp_Object | |
d3da34e0 | 2658 | call2 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2) |
db9f0278 | 2659 | { |
a6e3fa71 | 2660 | struct gcpro gcpro1; |
db9f0278 JB |
2661 | Lisp_Object args[3]; |
2662 | args[0] = fn; | |
15285f9f RS |
2663 | args[1] = arg1; |
2664 | args[2] = arg2; | |
a6e3fa71 JB |
2665 | GCPRO1 (args[0]); |
2666 | gcpro1.nvars = 3; | |
2667 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 JB |
2668 | } |
2669 | ||
f6d62986 | 2670 | /* Call function fn with 3 arguments arg1, arg2, arg3. */ |
db9f0278 JB |
2671 | /* ARGSUSED */ |
2672 | Lisp_Object | |
d3da34e0 | 2673 | call3 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) |
db9f0278 | 2674 | { |
a6e3fa71 | 2675 | struct gcpro gcpro1; |
db9f0278 JB |
2676 | Lisp_Object args[4]; |
2677 | args[0] = fn; | |
15285f9f RS |
2678 | args[1] = arg1; |
2679 | args[2] = arg2; | |
2680 | args[3] = arg3; | |
a6e3fa71 JB |
2681 | GCPRO1 (args[0]); |
2682 | gcpro1.nvars = 4; | |
2683 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 JB |
2684 | } |
2685 | ||
f6d62986 | 2686 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */ |
a5a44b91 JB |
2687 | /* ARGSUSED */ |
2688 | Lisp_Object | |
d3da34e0 JB |
2689 | call4 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2690 | Lisp_Object arg4) | |
a5a44b91 JB |
2691 | { |
2692 | struct gcpro gcpro1; | |
a5a44b91 JB |
2693 | Lisp_Object args[5]; |
2694 | args[0] = fn; | |
15285f9f RS |
2695 | args[1] = arg1; |
2696 | args[2] = arg2; | |
2697 | args[3] = arg3; | |
2698 | args[4] = arg4; | |
a5a44b91 JB |
2699 | GCPRO1 (args[0]); |
2700 | gcpro1.nvars = 5; | |
2701 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
a5a44b91 JB |
2702 | } |
2703 | ||
f6d62986 | 2704 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */ |
15285f9f RS |
2705 | /* ARGSUSED */ |
2706 | Lisp_Object | |
d3da34e0 JB |
2707 | call5 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2708 | Lisp_Object arg4, Lisp_Object arg5) | |
15285f9f RS |
2709 | { |
2710 | struct gcpro gcpro1; | |
15285f9f RS |
2711 | Lisp_Object args[6]; |
2712 | args[0] = fn; | |
2713 | args[1] = arg1; | |
2714 | args[2] = arg2; | |
2715 | args[3] = arg3; | |
2716 | args[4] = arg4; | |
2717 | args[5] = arg5; | |
2718 | GCPRO1 (args[0]); | |
2719 | gcpro1.nvars = 6; | |
2720 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
15285f9f RS |
2721 | } |
2722 | ||
f6d62986 | 2723 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */ |
15285f9f RS |
2724 | /* ARGSUSED */ |
2725 | Lisp_Object | |
d3da34e0 JB |
2726 | call6 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2727 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6) | |
15285f9f RS |
2728 | { |
2729 | struct gcpro gcpro1; | |
15285f9f RS |
2730 | Lisp_Object args[7]; |
2731 | args[0] = fn; | |
2732 | args[1] = arg1; | |
2733 | args[2] = arg2; | |
2734 | args[3] = arg3; | |
2735 | args[4] = arg4; | |
2736 | args[5] = arg5; | |
2737 | args[6] = arg6; | |
2738 | GCPRO1 (args[0]); | |
2739 | gcpro1.nvars = 7; | |
2740 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
15285f9f RS |
2741 | } |
2742 | ||
f6d62986 | 2743 | /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */ |
574c05e2 KK |
2744 | /* ARGSUSED */ |
2745 | Lisp_Object | |
d3da34e0 JB |
2746 | call7 (Lisp_Object fn, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3, |
2747 | Lisp_Object arg4, Lisp_Object arg5, Lisp_Object arg6, Lisp_Object arg7) | |
574c05e2 KK |
2748 | { |
2749 | struct gcpro gcpro1; | |
574c05e2 KK |
2750 | Lisp_Object args[8]; |
2751 | args[0] = fn; | |
2752 | args[1] = arg1; | |
2753 | args[2] = arg2; | |
2754 | args[3] = arg3; | |
2755 | args[4] = arg4; | |
2756 | args[5] = arg5; | |
2757 | args[6] = arg6; | |
2758 | args[7] = arg7; | |
2759 | GCPRO1 (args[0]); | |
2760 | gcpro1.nvars = 8; | |
2761 | RETURN_UNGCPRO (Ffuncall (8, args)); | |
574c05e2 KK |
2762 | } |
2763 | ||
6c2ef893 RS |
2764 | /* The caller should GCPRO all the elements of ARGS. */ |
2765 | ||
a7ca3326 | 2766 | DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0, |
7200d79c | 2767 | doc: /* Non-nil if OBJECT is a function. */) |
c566235d | 2768 | (Lisp_Object object) |
b9598260 | 2769 | { |
e1f29348 | 2770 | if (FUNCTIONP (object)) |
b9598260 | 2771 | return Qt; |
e1f29348 | 2772 | return Qnil; |
b9598260 SM |
2773 | } |
2774 | ||
a7ca3326 | 2775 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
9dbc9081 PJ |
2776 | doc: /* Call first argument as a function, passing remaining arguments to it. |
2777 | Return the value that function returns. | |
2778 | Thus, (funcall 'cons 'x 'y) returns (x . y). | |
2779 | usage: (funcall FUNCTION &rest ARGUMENTS) */) | |
f66c7cf8 | 2780 | (ptrdiff_t nargs, Lisp_Object *args) |
db9f0278 | 2781 | { |
8788120f | 2782 | Lisp_Object fun, original_fun; |
db9f0278 | 2783 | Lisp_Object funcar; |
f66c7cf8 | 2784 | ptrdiff_t numargs = nargs - 1; |
db9f0278 JB |
2785 | Lisp_Object lisp_numargs; |
2786 | Lisp_Object val; | |
db9f0278 | 2787 | register Lisp_Object *internal_args; |
f66c7cf8 | 2788 | ptrdiff_t i; |
db9f0278 JB |
2789 | |
2790 | QUIT; | |
db9f0278 JB |
2791 | |
2792 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2793 | { | |
2794 | if (max_lisp_eval_depth < 100) | |
2795 | max_lisp_eval_depth = 100; | |
2796 | if (lisp_eval_depth > max_lisp_eval_depth) | |
921baa95 | 2797 | error ("Lisp nesting exceeds `max-lisp-eval-depth'"); |
db9f0278 JB |
2798 | } |
2799 | ||
2f592f95 SM |
2800 | /* This also GCPROs them. */ |
2801 | record_in_backtrace (args[0], &args[1], nargs - 1); | |
db9f0278 | 2802 | |
7abaf5cc SM |
2803 | /* Call GC after setting up the backtrace, so the latter GCPROs the args. */ |
2804 | maybe_gc (); | |
2805 | ||
db9f0278 JB |
2806 | if (debug_on_next_call) |
2807 | do_debug_on_call (Qlambda); | |
2808 | ||
7e63e0c3 | 2809 | check_cons_list (); |
fff3ff9c | 2810 | |
8788120f KS |
2811 | original_fun = args[0]; |
2812 | ||
db9f0278 JB |
2813 | retry: |
2814 | ||
8788120f KS |
2815 | /* Optimize for no indirection. */ |
2816 | fun = original_fun; | |
eadf1faa | 2817 | if (SYMBOLP (fun) && !NILP (fun) |
c644523b | 2818 | && (fun = XSYMBOL (fun)->function, SYMBOLP (fun))) |
8788120f | 2819 | fun = indirect_function (fun); |
db9f0278 | 2820 | |
90165123 | 2821 | if (SUBRP (fun)) |
db9f0278 | 2822 | { |
ef1b0ba7 | 2823 | if (numargs < XSUBR (fun)->min_args |
db9f0278 JB |
2824 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) |
2825 | { | |
a631e24c | 2826 | XSETFASTINT (lisp_numargs, numargs); |
734d55a2 | 2827 | xsignal2 (Qwrong_number_of_arguments, original_fun, lisp_numargs); |
db9f0278 JB |
2828 | } |
2829 | ||
ef1b0ba7 | 2830 | else if (XSUBR (fun)->max_args == UNEVALLED) |
734d55a2 | 2831 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2832 | |
ef1b0ba7 SM |
2833 | else if (XSUBR (fun)->max_args == MANY) |
2834 | val = (XSUBR (fun)->function.aMANY) (numargs, args + 1); | |
db9f0278 | 2835 | else |
db9f0278 | 2836 | { |
ef1b0ba7 SM |
2837 | if (XSUBR (fun)->max_args > numargs) |
2838 | { | |
38182d90 PE |
2839 | internal_args = alloca (XSUBR (fun)->max_args |
2840 | * sizeof *internal_args); | |
663e2b3f | 2841 | memcpy (internal_args, args + 1, numargs * word_size); |
ef1b0ba7 SM |
2842 | for (i = numargs; i < XSUBR (fun)->max_args; i++) |
2843 | internal_args[i] = Qnil; | |
2844 | } | |
2845 | else | |
2846 | internal_args = args + 1; | |
2847 | switch (XSUBR (fun)->max_args) | |
2848 | { | |
2849 | case 0: | |
2850 | val = (XSUBR (fun)->function.a0 ()); | |
2851 | break; | |
2852 | case 1: | |
2853 | val = (XSUBR (fun)->function.a1 (internal_args[0])); | |
2854 | break; | |
2855 | case 2: | |
2856 | val = (XSUBR (fun)->function.a2 | |
2857 | (internal_args[0], internal_args[1])); | |
2858 | break; | |
2859 | case 3: | |
2860 | val = (XSUBR (fun)->function.a3 | |
2861 | (internal_args[0], internal_args[1], internal_args[2])); | |
2862 | break; | |
2863 | case 4: | |
2864 | val = (XSUBR (fun)->function.a4 | |
2865 | (internal_args[0], internal_args[1], internal_args[2], | |
2866 | internal_args[3])); | |
2867 | break; | |
2868 | case 5: | |
2869 | val = (XSUBR (fun)->function.a5 | |
2870 | (internal_args[0], internal_args[1], internal_args[2], | |
2871 | internal_args[3], internal_args[4])); | |
2872 | break; | |
2873 | case 6: | |
2874 | val = (XSUBR (fun)->function.a6 | |
2875 | (internal_args[0], internal_args[1], internal_args[2], | |
2876 | internal_args[3], internal_args[4], internal_args[5])); | |
2877 | break; | |
2878 | case 7: | |
2879 | val = (XSUBR (fun)->function.a7 | |
2880 | (internal_args[0], internal_args[1], internal_args[2], | |
2881 | internal_args[3], internal_args[4], internal_args[5], | |
2882 | internal_args[6])); | |
2883 | break; | |
2884 | ||
2885 | case 8: | |
2886 | val = (XSUBR (fun)->function.a8 | |
2887 | (internal_args[0], internal_args[1], internal_args[2], | |
2888 | internal_args[3], internal_args[4], internal_args[5], | |
2889 | internal_args[6], internal_args[7])); | |
2890 | break; | |
2891 | ||
2892 | default: | |
2893 | ||
2894 | /* If a subr takes more than 8 arguments without using MANY | |
2895 | or UNEVALLED, we need to extend this function to support it. | |
2896 | Until this is done, there is no way to call the function. */ | |
1088b922 | 2897 | emacs_abort (); |
ef1b0ba7 | 2898 | } |
db9f0278 JB |
2899 | } |
2900 | } | |
ef1b0ba7 | 2901 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2902 | val = funcall_lambda (fun, numargs, args + 1); |
2903 | else | |
2904 | { | |
eadf1faa | 2905 | if (NILP (fun)) |
734d55a2 | 2906 | xsignal1 (Qvoid_function, original_fun); |
db9f0278 | 2907 | if (!CONSP (fun)) |
734d55a2 KS |
2908 | xsignal1 (Qinvalid_function, original_fun); |
2909 | funcar = XCAR (fun); | |
90165123 | 2910 | if (!SYMBOLP (funcar)) |
734d55a2 | 2911 | xsignal1 (Qinvalid_function, original_fun); |
defb1411 SM |
2912 | if (EQ (funcar, Qlambda) |
2913 | || EQ (funcar, Qclosure)) | |
db9f0278 | 2914 | val = funcall_lambda (fun, numargs, args + 1); |
db9f0278 JB |
2915 | else if (EQ (funcar, Qautoload)) |
2916 | { | |
7abaf5cc | 2917 | Fautoload_do_load (fun, original_fun, Qnil); |
7e63e0c3 | 2918 | check_cons_list (); |
db9f0278 JB |
2919 | goto retry; |
2920 | } | |
2921 | else | |
734d55a2 | 2922 | xsignal1 (Qinvalid_function, original_fun); |
db9f0278 | 2923 | } |
7e63e0c3 | 2924 | check_cons_list (); |
db9f0278 | 2925 | lisp_eval_depth--; |
2f592f95 | 2926 | if (backtrace_debug_on_exit (specpdl_ptr - 1)) |
6c6f1994 | 2927 | val = call_debugger (list2 (Qexit, val)); |
2f592f95 | 2928 | specpdl_ptr--; |
db9f0278 JB |
2929 | return val; |
2930 | } | |
2931 | \f | |
2f7c71a1 | 2932 | static Lisp_Object |
defb1411 | 2933 | apply_lambda (Lisp_Object fun, Lisp_Object args) |
db9f0278 JB |
2934 | { |
2935 | Lisp_Object args_left; | |
d311d28c PE |
2936 | ptrdiff_t i; |
2937 | EMACS_INT numargs; | |
db9f0278 JB |
2938 | register Lisp_Object *arg_vector; |
2939 | struct gcpro gcpro1, gcpro2, gcpro3; | |
db9f0278 | 2940 | register Lisp_Object tem; |
3a7a9129 | 2941 | USE_SAFE_ALLOCA; |
db9f0278 | 2942 | |
f66c7cf8 | 2943 | numargs = XFASTINT (Flength (args)); |
c5101a77 | 2944 | SAFE_ALLOCA_LISP (arg_vector, numargs); |
db9f0278 JB |
2945 | args_left = args; |
2946 | ||
2947 | GCPRO3 (*arg_vector, args_left, fun); | |
2948 | gcpro1.nvars = 0; | |
2949 | ||
c5101a77 | 2950 | for (i = 0; i < numargs; ) |
db9f0278 JB |
2951 | { |
2952 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
defb1411 | 2953 | tem = eval_sub (tem); |
db9f0278 JB |
2954 | arg_vector[i++] = tem; |
2955 | gcpro1.nvars = i; | |
2956 | } | |
2957 | ||
2958 | UNGCPRO; | |
2959 | ||
2f592f95 SM |
2960 | set_backtrace_args (specpdl_ptr - 1, arg_vector); |
2961 | set_backtrace_nargs (specpdl_ptr - 1, i); | |
c5101a77 | 2962 | tem = funcall_lambda (fun, numargs, arg_vector); |
db9f0278 JB |
2963 | |
2964 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2f592f95 SM |
2965 | if (backtrace_debug_on_exit (specpdl_ptr - 1)) |
2966 | { | |
2967 | /* Don't do it again when we return to eval. */ | |
2968 | set_backtrace_debug_on_exit (specpdl_ptr - 1, false); | |
6c6f1994 | 2969 | tem = call_debugger (list2 (Qexit, tem)); |
2f592f95 | 2970 | } |
3a7a9129 | 2971 | SAFE_FREE (); |
db9f0278 JB |
2972 | return tem; |
2973 | } | |
2974 | ||
2975 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2976 | and return the result of evaluation. | |
2977 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2978 | ||
2901f1d1 | 2979 | static Lisp_Object |
f66c7cf8 | 2980 | funcall_lambda (Lisp_Object fun, ptrdiff_t nargs, |
c5101a77 | 2981 | register Lisp_Object *arg_vector) |
db9f0278 | 2982 | { |
defb1411 | 2983 | Lisp_Object val, syms_left, next, lexenv; |
d311d28c | 2984 | ptrdiff_t count = SPECPDL_INDEX (); |
f66c7cf8 | 2985 | ptrdiff_t i; |
1882aa38 | 2986 | bool optional, rest; |
db9f0278 | 2987 | |
90165123 | 2988 | if (CONSP (fun)) |
9ab90667 | 2989 | { |
defb1411 SM |
2990 | if (EQ (XCAR (fun), Qclosure)) |
2991 | { | |
2992 | fun = XCDR (fun); /* Drop `closure'. */ | |
2993 | lexenv = XCAR (fun); | |
23aba0ea | 2994 | CHECK_LIST_CONS (fun, fun); |
defb1411 SM |
2995 | } |
2996 | else | |
2997 | lexenv = Qnil; | |
9ab90667 GM |
2998 | syms_left = XCDR (fun); |
2999 | if (CONSP (syms_left)) | |
3000 | syms_left = XCAR (syms_left); | |
3001 | else | |
734d55a2 | 3002 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3003 | } |
90165123 | 3004 | else if (COMPILEDP (fun)) |
defb1411 | 3005 | { |
798cb644 SM |
3006 | syms_left = AREF (fun, COMPILED_ARGLIST); |
3007 | if (INTEGERP (syms_left)) | |
876c194c SM |
3008 | /* A byte-code object with a non-nil `push args' slot means we |
3009 | shouldn't bind any arguments, instead just call the byte-code | |
3010 | interpreter directly; it will push arguments as necessary. | |
3011 | ||
9173deec | 3012 | Byte-code objects with either a non-existent, or a nil value for |
876c194c SM |
3013 | the `push args' slot (the default), have dynamically-bound |
3014 | arguments, and use the argument-binding code below instead (as do | |
3015 | all interpreted functions, even lexically bound ones). */ | |
3016 | { | |
3017 | /* If we have not actually read the bytecode string | |
3018 | and constants vector yet, fetch them from the file. */ | |
3019 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) | |
3020 | Ffetch_bytecode (fun); | |
3021 | return exec_byte_code (AREF (fun, COMPILED_BYTECODE), | |
3022 | AREF (fun, COMPILED_CONSTANTS), | |
3023 | AREF (fun, COMPILED_STACK_DEPTH), | |
798cb644 | 3024 | syms_left, |
876c194c SM |
3025 | nargs, arg_vector); |
3026 | } | |
defb1411 SM |
3027 | lexenv = Qnil; |
3028 | } | |
9ab90667 | 3029 | else |
1088b922 | 3030 | emacs_abort (); |
db9f0278 | 3031 | |
9ab90667 GM |
3032 | i = optional = rest = 0; |
3033 | for (; CONSP (syms_left); syms_left = XCDR (syms_left)) | |
db9f0278 JB |
3034 | { |
3035 | QUIT; | |
177c0ea7 | 3036 | |
9ab90667 | 3037 | next = XCAR (syms_left); |
8788120f | 3038 | if (!SYMBOLP (next)) |
734d55a2 | 3039 | xsignal1 (Qinvalid_function, fun); |
177c0ea7 | 3040 | |
db9f0278 JB |
3041 | if (EQ (next, Qand_rest)) |
3042 | rest = 1; | |
3043 | else if (EQ (next, Qand_optional)) | |
3044 | optional = 1; | |
db9f0278 | 3045 | else |
db9f0278 | 3046 | { |
e610eaca | 3047 | Lisp_Object arg; |
defb1411 SM |
3048 | if (rest) |
3049 | { | |
e610eaca | 3050 | arg = Flist (nargs - i, &arg_vector[i]); |
defb1411 SM |
3051 | i = nargs; |
3052 | } | |
3053 | else if (i < nargs) | |
e610eaca | 3054 | arg = arg_vector[i++]; |
b9598260 SM |
3055 | else if (!optional) |
3056 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); | |
3057 | else | |
e610eaca | 3058 | arg = Qnil; |
7200d79c | 3059 | |
b9598260 | 3060 | /* Bind the argument. */ |
876c194c | 3061 | if (!NILP (lexenv) && SYMBOLP (next)) |
b9598260 | 3062 | /* Lexically bind NEXT by adding it to the lexenv alist. */ |
e610eaca | 3063 | lexenv = Fcons (Fcons (next, arg), lexenv); |
b9598260 SM |
3064 | else |
3065 | /* Dynamically bind NEXT. */ | |
e610eaca | 3066 | specbind (next, arg); |
db9f0278 | 3067 | } |
db9f0278 JB |
3068 | } |
3069 | ||
9ab90667 | 3070 | if (!NILP (syms_left)) |
734d55a2 | 3071 | xsignal1 (Qinvalid_function, fun); |
9ab90667 | 3072 | else if (i < nargs) |
734d55a2 | 3073 | xsignal2 (Qwrong_number_of_arguments, fun, make_number (nargs)); |
db9f0278 | 3074 | |
b9598260 SM |
3075 | if (!EQ (lexenv, Vinternal_interpreter_environment)) |
3076 | /* Instantiate a new lexical environment. */ | |
3077 | specbind (Qinternal_interpreter_environment, lexenv); | |
3078 | ||
90165123 | 3079 | if (CONSP (fun)) |
9ab90667 | 3080 | val = Fprogn (XCDR (XCDR (fun))); |
db9f0278 | 3081 | else |
ca248607 RS |
3082 | { |
3083 | /* If we have not actually read the bytecode string | |
3084 | and constants vector yet, fetch them from the file. */ | |
845975f5 | 3085 | if (CONSP (AREF (fun, COMPILED_BYTECODE))) |
661c7d6e | 3086 | Ffetch_bytecode (fun); |
b9598260 SM |
3087 | val = exec_byte_code (AREF (fun, COMPILED_BYTECODE), |
3088 | AREF (fun, COMPILED_CONSTANTS), | |
3089 | AREF (fun, COMPILED_STACK_DEPTH), | |
3090 | Qnil, 0, 0); | |
ca248607 | 3091 | } |
177c0ea7 | 3092 | |
db9f0278 JB |
3093 | return unbind_to (count, val); |
3094 | } | |
661c7d6e KH |
3095 | |
3096 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
9dbc9081 PJ |
3097 | 1, 1, 0, |
3098 | doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */) | |
5842a27b | 3099 | (Lisp_Object object) |
661c7d6e KH |
3100 | { |
3101 | Lisp_Object tem; | |
3102 | ||
845975f5 | 3103 | if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE))) |
661c7d6e | 3104 | { |
845975f5 | 3105 | tem = read_doc_string (AREF (object, COMPILED_BYTECODE)); |
5bbdb090 | 3106 | if (!CONSP (tem)) |
845975f5 SM |
3107 | { |
3108 | tem = AREF (object, COMPILED_BYTECODE); | |
3109 | if (CONSP (tem) && STRINGP (XCAR (tem))) | |
d5db4077 | 3110 | error ("Invalid byte code in %s", SDATA (XCAR (tem))); |
845975f5 SM |
3111 | else |
3112 | error ("Invalid byte code"); | |
3113 | } | |
3ae565b3 SM |
3114 | ASET (object, COMPILED_BYTECODE, XCAR (tem)); |
3115 | ASET (object, COMPILED_CONSTANTS, XCDR (tem)); | |
661c7d6e KH |
3116 | } |
3117 | return object; | |
3118 | } | |
db9f0278 | 3119 | \f |
2f592f95 SM |
3120 | /* Return true if SYMBOL currently has a let-binding |
3121 | which was made in the buffer that is now current. */ | |
3122 | ||
3123 | bool | |
3124 | let_shadows_buffer_binding_p (struct Lisp_Symbol *symbol) | |
db9f0278 | 3125 | { |
9349e5f7 | 3126 | union specbinding *p; |
2f592f95 SM |
3127 | Lisp_Object buf = Fcurrent_buffer (); |
3128 | ||
3129 | for (p = specpdl_ptr; p > specpdl; ) | |
3130 | if ((--p)->kind > SPECPDL_LET) | |
3131 | { | |
3132 | struct Lisp_Symbol *let_bound_symbol = XSYMBOL (specpdl_symbol (p)); | |
3133 | eassert (let_bound_symbol->redirect != SYMBOL_VARALIAS); | |
3134 | if (symbol == let_bound_symbol | |
3135 | && EQ (specpdl_where (p), buf)) | |
3136 | return 1; | |
3137 | } | |
3138 | ||
3139 | return 0; | |
3140 | } | |
3141 | ||
3142 | bool | |
3143 | let_shadows_global_binding_p (Lisp_Object symbol) | |
3144 | { | |
9349e5f7 | 3145 | union specbinding *p; |
2f592f95 SM |
3146 | |
3147 | for (p = specpdl_ptr; p > specpdl; ) | |
3148 | if ((--p)->kind >= SPECPDL_LET && EQ (specpdl_symbol (p), symbol)) | |
3149 | return 1; | |
3150 | ||
3151 | return 0; | |
db9f0278 JB |
3152 | } |
3153 | ||
f6d62986 | 3154 | /* `specpdl_ptr->symbol' is a field which describes which variable is |
4e2db1fe SM |
3155 | let-bound, so it can be properly undone when we unbind_to. |
3156 | It can have the following two shapes: | |
3157 | - SYMBOL : if it's a plain symbol, it means that we have let-bound | |
3158 | a symbol that is not buffer-local (at least at the time | |
3159 | the let binding started). Note also that it should not be | |
3160 | aliased (i.e. when let-binding V1 that's aliased to V2, we want | |
3161 | to record V2 here). | |
3162 | - (SYMBOL WHERE . BUFFER) : this means that it is a let-binding for | |
3163 | variable SYMBOL which can be buffer-local. WHERE tells us | |
3164 | which buffer is affected (or nil if the let-binding affects the | |
3165 | global value of the variable) and BUFFER tells us which buffer was | |
3166 | current (i.e. if WHERE is non-nil, then BUFFER==WHERE, otherwise | |
3167 | BUFFER did not yet have a buffer-local value). */ | |
3168 | ||
db9f0278 | 3169 | void |
d3da34e0 | 3170 | specbind (Lisp_Object symbol, Lisp_Object value) |
db9f0278 | 3171 | { |
ce5b453a SM |
3172 | struct Lisp_Symbol *sym; |
3173 | ||
b7826503 | 3174 | CHECK_SYMBOL (symbol); |
ce5b453a | 3175 | sym = XSYMBOL (symbol); |
719177b3 | 3176 | |
ce5b453a SM |
3177 | start: |
3178 | switch (sym->redirect) | |
719177b3 | 3179 | { |
ce5b453a SM |
3180 | case SYMBOL_VARALIAS: |
3181 | sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start; | |
3182 | case SYMBOL_PLAINVAL: | |
bb8e180f AS |
3183 | /* The most common case is that of a non-constant symbol with a |
3184 | trivial value. Make that as fast as we can. */ | |
9349e5f7 PE |
3185 | specpdl_ptr->let.kind = SPECPDL_LET; |
3186 | specpdl_ptr->let.symbol = symbol; | |
3187 | specpdl_ptr->let.old_value = SYMBOL_VAL (sym); | |
5e301d76 | 3188 | grow_specpdl (); |
bb8e180f AS |
3189 | if (!sym->constant) |
3190 | SET_SYMBOL_VAL (sym, value); | |
3191 | else | |
3192 | set_internal (symbol, value, Qnil, 1); | |
3193 | break; | |
4e2db1fe SM |
3194 | case SYMBOL_LOCALIZED: |
3195 | if (SYMBOL_BLV (sym)->frame_local) | |
3196 | error ("Frame-local vars cannot be let-bound"); | |
3197 | case SYMBOL_FORWARDED: | |
ce5b453a SM |
3198 | { |
3199 | Lisp_Object ovalue = find_symbol_value (symbol); | |
9349e5f7 PE |
3200 | specpdl_ptr->let.kind = SPECPDL_LET_LOCAL; |
3201 | specpdl_ptr->let.symbol = symbol; | |
3202 | specpdl_ptr->let.old_value = ovalue; | |
3203 | specpdl_ptr->let.where = Fcurrent_buffer (); | |
ce5b453a SM |
3204 | |
3205 | eassert (sym->redirect != SYMBOL_LOCALIZED | |
2f592f95 | 3206 | || (EQ (SYMBOL_BLV (sym)->where, Fcurrent_buffer ()))); |
ce5b453a | 3207 | |
2f592f95 SM |
3208 | if (sym->redirect == SYMBOL_LOCALIZED) |
3209 | { | |
3210 | if (!blv_found (SYMBOL_BLV (sym))) | |
9349e5f7 | 3211 | specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT; |
2f592f95 SM |
3212 | } |
3213 | else if (BUFFER_OBJFWDP (SYMBOL_FWD (sym))) | |
ce5b453a | 3214 | { |
ce5b453a SM |
3215 | /* If SYMBOL is a per-buffer variable which doesn't have a |
3216 | buffer-local value here, make the `let' change the global | |
3217 | value by changing the value of SYMBOL in all buffers not | |
3218 | having their own value. This is consistent with what | |
3219 | happens with other buffer-local variables. */ | |
2f592f95 | 3220 | if (NILP (Flocal_variable_p (symbol, Qnil))) |
ce5b453a | 3221 | { |
9349e5f7 | 3222 | specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT; |
5e301d76 | 3223 | grow_specpdl (); |
ce5b453a SM |
3224 | Fset_default (symbol, value); |
3225 | return; | |
3226 | } | |
3227 | } | |
3228 | else | |
9349e5f7 | 3229 | specpdl_ptr->let.kind = SPECPDL_LET; |
ce5b453a | 3230 | |
5e301d76 | 3231 | grow_specpdl (); |
94b612ad | 3232 | set_internal (symbol, value, Qnil, 1); |
ce5b453a SM |
3233 | break; |
3234 | } | |
1088b922 | 3235 | default: emacs_abort (); |
9ab90667 | 3236 | } |
db9f0278 JB |
3237 | } |
3238 | ||
f4b1eb36 PE |
3239 | /* Push unwind-protect entries of various types. */ |
3240 | ||
db9f0278 | 3241 | void |
27e498e6 | 3242 | record_unwind_protect (void (*function) (Lisp_Object), Lisp_Object arg) |
db9f0278 | 3243 | { |
9349e5f7 PE |
3244 | specpdl_ptr->unwind.kind = SPECPDL_UNWIND; |
3245 | specpdl_ptr->unwind.func = function; | |
3246 | specpdl_ptr->unwind.arg = arg; | |
5e301d76 | 3247 | grow_specpdl (); |
db9f0278 JB |
3248 | } |
3249 | ||
27e498e6 PE |
3250 | void |
3251 | record_unwind_protect_ptr (void (*function) (void *), void *arg) | |
3252 | { | |
3253 | specpdl_ptr->unwind_ptr.kind = SPECPDL_UNWIND_PTR; | |
3254 | specpdl_ptr->unwind_ptr.func = function; | |
3255 | specpdl_ptr->unwind_ptr.arg = arg; | |
3256 | grow_specpdl (); | |
3257 | } | |
3258 | ||
3259 | void | |
3260 | record_unwind_protect_int (void (*function) (int), int arg) | |
3261 | { | |
3262 | specpdl_ptr->unwind_int.kind = SPECPDL_UNWIND_INT; | |
3263 | specpdl_ptr->unwind_int.func = function; | |
3264 | specpdl_ptr->unwind_int.arg = arg; | |
3265 | grow_specpdl (); | |
3266 | } | |
3267 | ||
3268 | void | |
3269 | record_unwind_protect_void (void (*function) (void)) | |
3270 | { | |
3271 | specpdl_ptr->unwind_void.kind = SPECPDL_UNWIND_VOID; | |
3272 | specpdl_ptr->unwind_void.func = function; | |
3273 | grow_specpdl (); | |
3274 | } | |
3275 | ||
a0931322 PE |
3276 | static void |
3277 | do_nothing (void) | |
3278 | {} | |
3279 | ||
f4b1eb36 PE |
3280 | /* Push an unwind-protect entry that does nothing, so that |
3281 | set_unwind_protect_ptr can overwrite it later. */ | |
3282 | ||
3283 | void | |
3284 | record_unwind_protect_nothing (void) | |
3285 | { | |
3286 | record_unwind_protect_void (do_nothing); | |
3287 | } | |
3288 | ||
3289 | /* Clear the unwind-protect entry COUNT, so that it does nothing. | |
3290 | It need not be at the top of the stack. */ | |
3291 | ||
a0931322 PE |
3292 | void |
3293 | clear_unwind_protect (ptrdiff_t count) | |
3294 | { | |
3295 | union specbinding *p = specpdl + count; | |
3296 | p->unwind_void.kind = SPECPDL_UNWIND_VOID; | |
3297 | p->unwind_void.func = do_nothing; | |
3298 | } | |
3299 | ||
f4b1eb36 PE |
3300 | /* Set the unwind-protect entry COUNT so that it invokes FUNC (ARG). |
3301 | It need not be at the top of the stack. Discard the entry's | |
3302 | previous value without invoking it. */ | |
3303 | ||
a0931322 PE |
3304 | void |
3305 | set_unwind_protect_ptr (ptrdiff_t count, void (*func) (void *), void *arg) | |
3306 | { | |
3307 | union specbinding *p = specpdl + count; | |
3308 | p->unwind_ptr.kind = SPECPDL_UNWIND_PTR; | |
3309 | p->unwind_ptr.func = func; | |
3310 | p->unwind_ptr.arg = arg; | |
3311 | } | |
3312 | ||
f4b1eb36 PE |
3313 | /* Pop and execute entries from the unwind-protect stack until the |
3314 | depth COUNT is reached. Return VALUE. */ | |
3315 | ||
db9f0278 | 3316 | Lisp_Object |
d311d28c | 3317 | unbind_to (ptrdiff_t count, Lisp_Object value) |
db9f0278 | 3318 | { |
5a073f50 KS |
3319 | Lisp_Object quitf = Vquit_flag; |
3320 | struct gcpro gcpro1, gcpro2; | |
db9f0278 | 3321 | |
5a073f50 | 3322 | GCPRO2 (value, quitf); |
db9f0278 JB |
3323 | Vquit_flag = Qnil; |
3324 | ||
3325 | while (specpdl_ptr != specpdl + count) | |
3326 | { | |
9349e5f7 PE |
3327 | /* Decrement specpdl_ptr before we do the work to unbind it, so |
3328 | that an error in unbinding won't try to unbind the same entry | |
3329 | again. Take care to copy any parts of the binding needed | |
3330 | before invoking any code that can make more bindings. */ | |
eb700b82 | 3331 | |
9349e5f7 | 3332 | specpdl_ptr--; |
611a8f8c | 3333 | |
9349e5f7 | 3334 | switch (specpdl_ptr->kind) |
719177b3 | 3335 | { |
2f592f95 | 3336 | case SPECPDL_UNWIND: |
27e498e6 PE |
3337 | specpdl_ptr->unwind.func (specpdl_ptr->unwind.arg); |
3338 | break; | |
3339 | case SPECPDL_UNWIND_PTR: | |
3340 | specpdl_ptr->unwind_ptr.func (specpdl_ptr->unwind_ptr.arg); | |
3341 | break; | |
3342 | case SPECPDL_UNWIND_INT: | |
3343 | specpdl_ptr->unwind_int.func (specpdl_ptr->unwind_int.arg); | |
3344 | break; | |
3345 | case SPECPDL_UNWIND_VOID: | |
3346 | specpdl_ptr->unwind_void.func (); | |
2f592f95 | 3347 | break; |
56ea7291 SM |
3348 | case SPECPDL_BACKTRACE: |
3349 | break; | |
2f592f95 | 3350 | case SPECPDL_LET: |
a104f656 SM |
3351 | { /* If variable has a trivial value (no forwarding), we can |
3352 | just set it. No need to check for constant symbols here, | |
3353 | since that was already done by specbind. */ | |
3354 | struct Lisp_Symbol *sym = XSYMBOL (specpdl_symbol (specpdl_ptr)); | |
3355 | if (sym->redirect == SYMBOL_PLAINVAL) | |
3356 | { | |
3357 | SET_SYMBOL_VAL (sym, specpdl_old_value (specpdl_ptr)); | |
3358 | break; | |
3359 | } | |
3360 | else | |
3361 | { /* FALLTHROUGH!! | |
3362 | NOTE: we only ever come here if make_local_foo was used for | |
3363 | the first time on this var within this let. */ | |
3364 | } | |
3365 | } | |
56ea7291 SM |
3366 | case SPECPDL_LET_DEFAULT: |
3367 | Fset_default (specpdl_symbol (specpdl_ptr), | |
3368 | specpdl_old_value (specpdl_ptr)); | |
2f592f95 SM |
3369 | break; |
3370 | case SPECPDL_LET_LOCAL: | |
56ea7291 | 3371 | { |
9349e5f7 PE |
3372 | Lisp_Object symbol = specpdl_symbol (specpdl_ptr); |
3373 | Lisp_Object where = specpdl_where (specpdl_ptr); | |
3374 | Lisp_Object old_value = specpdl_old_value (specpdl_ptr); | |
2f592f95 SM |
3375 | eassert (BUFFERP (where)); |
3376 | ||
2f592f95 SM |
3377 | /* If this was a local binding, reset the value in the appropriate |
3378 | buffer, but only if that buffer's binding still exists. */ | |
56ea7291 | 3379 | if (!NILP (Flocal_variable_p (symbol, where))) |
9349e5f7 | 3380 | set_internal (symbol, old_value, where, 1); |
2f592f95 SM |
3381 | } |
3382 | break; | |
719177b3 | 3383 | } |
db9f0278 | 3384 | } |
177c0ea7 | 3385 | |
5a073f50 KS |
3386 | if (NILP (Vquit_flag) && !NILP (quitf)) |
3387 | Vquit_flag = quitf; | |
db9f0278 JB |
3388 | |
3389 | UNGCPRO; | |
db9f0278 JB |
3390 | return value; |
3391 | } | |
b9598260 | 3392 | |
4a330052 | 3393 | DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0, |
b9598260 SM |
3394 | doc: /* Return non-nil if SYMBOL's global binding has been declared special. |
3395 | A special variable is one that will be bound dynamically, even in a | |
3396 | context where binding is lexical by default. */) | |
c566235d | 3397 | (Lisp_Object symbol) |
b9598260 SM |
3398 | { |
3399 | CHECK_SYMBOL (symbol); | |
3400 | return XSYMBOL (symbol)->declared_special ? Qt : Qnil; | |
3401 | } | |
3402 | ||
db9f0278 | 3403 | \f |
db9f0278 | 3404 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, |
9dbc9081 PJ |
3405 | doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG. |
3406 | The debugger is entered when that frame exits, if the flag is non-nil. */) | |
5842a27b | 3407 | (Lisp_Object level, Lisp_Object flag) |
db9f0278 | 3408 | { |
9349e5f7 | 3409 | union specbinding *pdl = backtrace_top (); |
d311d28c | 3410 | register EMACS_INT i; |
db9f0278 | 3411 | |
b7826503 | 3412 | CHECK_NUMBER (level); |
db9f0278 | 3413 | |
2f592f95 SM |
3414 | for (i = 0; backtrace_p (pdl) && i < XINT (level); i++) |
3415 | pdl = backtrace_next (pdl); | |
db9f0278 | 3416 | |
2f592f95 SM |
3417 | if (backtrace_p (pdl)) |
3418 | set_backtrace_debug_on_exit (pdl, !NILP (flag)); | |
db9f0278 JB |
3419 | |
3420 | return flag; | |
3421 | } | |
3422 | ||
3423 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
9dbc9081 PJ |
3424 | doc: /* Print a trace of Lisp function calls currently active. |
3425 | Output stream used is value of `standard-output'. */) | |
5842a27b | 3426 | (void) |
db9f0278 | 3427 | { |
9349e5f7 | 3428 | union specbinding *pdl = backtrace_top (); |
db9f0278 | 3429 | Lisp_Object tem; |
d4b6d95d | 3430 | Lisp_Object old_print_level = Vprint_level; |
db9f0278 | 3431 | |
d4b6d95d LMI |
3432 | if (NILP (Vprint_level)) |
3433 | XSETFASTINT (Vprint_level, 8); | |
db9f0278 | 3434 | |
2f592f95 | 3435 | while (backtrace_p (pdl)) |
db9f0278 | 3436 | { |
2f592f95 SM |
3437 | write_string (backtrace_debug_on_exit (pdl) ? "* " : " ", 2); |
3438 | if (backtrace_nargs (pdl) == UNEVALLED) | |
db9f0278 | 3439 | { |
2f592f95 SM |
3440 | Fprin1 (Fcons (backtrace_function (pdl), *backtrace_args (pdl)), |
3441 | Qnil); | |
b6703b02 | 3442 | write_string ("\n", -1); |
db9f0278 JB |
3443 | } |
3444 | else | |
3445 | { | |
2f592f95 | 3446 | tem = backtrace_function (pdl); |
f6d62986 | 3447 | Fprin1 (tem, Qnil); /* This can QUIT. */ |
db9f0278 | 3448 | write_string ("(", -1); |
2f592f95 SM |
3449 | { |
3450 | ptrdiff_t i; | |
3451 | for (i = 0; i < backtrace_nargs (pdl); i++) | |
3452 | { | |
3453 | if (i) write_string (" ", -1); | |
3454 | Fprin1 (backtrace_args (pdl)[i], Qnil); | |
3455 | } | |
3456 | } | |
b6703b02 | 3457 | write_string (")\n", -1); |
db9f0278 | 3458 | } |
2f592f95 | 3459 | pdl = backtrace_next (pdl); |
db9f0278 JB |
3460 | } |
3461 | ||
d4b6d95d | 3462 | Vprint_level = old_print_level; |
db9f0278 JB |
3463 | return Qnil; |
3464 | } | |
3465 | ||
d5a7a9d9 | 3466 | static union specbinding * |
56ea7291 SM |
3467 | get_backtrace_frame (Lisp_Object nframes, Lisp_Object base) |
3468 | { | |
3469 | union specbinding *pdl = backtrace_top (); | |
3470 | register EMACS_INT i; | |
3471 | ||
3472 | CHECK_NATNUM (nframes); | |
3473 | ||
3474 | if (!NILP (base)) | |
3475 | { /* Skip up to `base'. */ | |
3476 | base = Findirect_function (base, Qt); | |
3477 | while (backtrace_p (pdl) | |
3478 | && !EQ (base, Findirect_function (backtrace_function (pdl), Qt))) | |
3479 | pdl = backtrace_next (pdl); | |
3480 | } | |
3481 | ||
3482 | /* Find the frame requested. */ | |
3483 | for (i = XFASTINT (nframes); i > 0 && backtrace_p (pdl); i--) | |
3484 | pdl = backtrace_next (pdl); | |
3485 | ||
3486 | return pdl; | |
3487 | } | |
3488 | ||
3489 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 2, NULL, | |
9dbc9081 PJ |
3490 | doc: /* Return the function and arguments NFRAMES up from current execution point. |
3491 | If that frame has not evaluated the arguments yet (or is a special form), | |
3492 | the value is (nil FUNCTION ARG-FORMS...). | |
3493 | If that frame has evaluated its arguments and called its function already, | |
3494 | the value is (t FUNCTION ARG-VALUES...). | |
3495 | A &rest arg is represented as the tail of the list ARG-VALUES. | |
3496 | FUNCTION is whatever was supplied as car of evaluated list, | |
3497 | or a lambda expression for macro calls. | |
56ea7291 SM |
3498 | If NFRAMES is more than the number of frames, the value is nil. |
3499 | If BASE is non-nil, it should be a function and NFRAMES counts from its | |
3500 | nearest activation frame. */) | |
3501 | (Lisp_Object nframes, Lisp_Object base) | |
db9f0278 | 3502 | { |
56ea7291 | 3503 | union specbinding *pdl = get_backtrace_frame (nframes, base); |
db9f0278 | 3504 | |
2f592f95 | 3505 | if (!backtrace_p (pdl)) |
db9f0278 | 3506 | return Qnil; |
2f592f95 SM |
3507 | if (backtrace_nargs (pdl) == UNEVALLED) |
3508 | return Fcons (Qnil, | |
3509 | Fcons (backtrace_function (pdl), *backtrace_args (pdl))); | |
db9f0278 JB |
3510 | else |
3511 | { | |
2f592f95 | 3512 | Lisp_Object tem = Flist (backtrace_nargs (pdl), backtrace_args (pdl)); |
db9f0278 | 3513 | |
2f592f95 | 3514 | return Fcons (Qt, Fcons (backtrace_function (pdl), tem)); |
db9f0278 JB |
3515 | } |
3516 | } | |
a2ff3819 | 3517 | |
56ea7291 SM |
3518 | /* For backtrace-eval, we want to temporarily unwind the last few elements of |
3519 | the specpdl stack, and then rewind them. We store the pre-unwind values | |
3520 | directly in the pre-existing specpdl elements (i.e. we swap the current | |
3521 | value and the old value stored in the specpdl), kind of like the inplace | |
3522 | pointer-reversal trick. As it turns out, the rewind does the same as the | |
94fea300 | 3523 | unwind, except it starts from the other end of the specpdl stack, so we use |
56ea7291 | 3524 | the same function for both unwind and rewind. */ |
d5a7a9d9 | 3525 | static void |
56ea7291 SM |
3526 | backtrace_eval_unrewind (int distance) |
3527 | { | |
3528 | union specbinding *tmp = specpdl_ptr; | |
3529 | int step = -1; | |
3530 | if (distance < 0) | |
3531 | { /* It's a rewind rather than unwind. */ | |
3532 | tmp += distance - 1; | |
3533 | step = 1; | |
3534 | distance = -distance; | |
3535 | } | |
3536 | ||
3537 | for (; distance > 0; distance--) | |
3538 | { | |
3539 | tmp += step; | |
3540 | /* */ | |
3541 | switch (tmp->kind) | |
3542 | { | |
3543 | /* FIXME: Ideally we'd like to "temporarily unwind" (some of) those | |
3544 | unwind_protect, but the problem is that we don't know how to | |
3545 | rewind them afterwards. */ | |
3546 | case SPECPDL_UNWIND: | |
3547 | case SPECPDL_UNWIND_PTR: | |
3548 | case SPECPDL_UNWIND_INT: | |
3549 | case SPECPDL_UNWIND_VOID: | |
3550 | case SPECPDL_BACKTRACE: | |
3551 | break; | |
3552 | case SPECPDL_LET: | |
a104f656 SM |
3553 | { /* If variable has a trivial value (no forwarding), we can |
3554 | just set it. No need to check for constant symbols here, | |
3555 | since that was already done by specbind. */ | |
3556 | struct Lisp_Symbol *sym = XSYMBOL (specpdl_symbol (tmp)); | |
3557 | if (sym->redirect == SYMBOL_PLAINVAL) | |
3558 | { | |
3559 | Lisp_Object old_value = specpdl_old_value (tmp); | |
3560 | set_specpdl_old_value (tmp, SYMBOL_VAL (sym)); | |
3561 | SET_SYMBOL_VAL (sym, old_value); | |
3562 | break; | |
3563 | } | |
3564 | else | |
3565 | { /* FALLTHROUGH!! | |
3566 | NOTE: we only ever come here if make_local_foo was used for | |
3567 | the first time on this var within this let. */ | |
3568 | } | |
3569 | } | |
56ea7291 SM |
3570 | case SPECPDL_LET_DEFAULT: |
3571 | { | |
3572 | Lisp_Object sym = specpdl_symbol (tmp); | |
3573 | Lisp_Object old_value = specpdl_old_value (tmp); | |
3574 | set_specpdl_old_value (tmp, Fdefault_value (sym)); | |
3575 | Fset_default (sym, old_value); | |
3576 | } | |
3577 | break; | |
3578 | case SPECPDL_LET_LOCAL: | |
3579 | { | |
3580 | Lisp_Object symbol = specpdl_symbol (tmp); | |
3581 | Lisp_Object where = specpdl_where (tmp); | |
3582 | Lisp_Object old_value = specpdl_old_value (tmp); | |
3583 | eassert (BUFFERP (where)); | |
3584 | ||
3585 | /* If this was a local binding, reset the value in the appropriate | |
3586 | buffer, but only if that buffer's binding still exists. */ | |
3587 | if (!NILP (Flocal_variable_p (symbol, where))) | |
3588 | { | |
3589 | set_specpdl_old_value | |
3590 | (tmp, Fbuffer_local_value (symbol, where)); | |
3591 | set_internal (symbol, old_value, where, 1); | |
3592 | } | |
3593 | } | |
3594 | break; | |
3595 | } | |
3596 | } | |
3597 | } | |
3598 | ||
3599 | DEFUN ("backtrace-eval", Fbacktrace_eval, Sbacktrace_eval, 2, 3, NULL, | |
3600 | doc: /* Evaluate EXP in the context of some activation frame. | |
3601 | NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */) | |
3602 | (Lisp_Object exp, Lisp_Object nframes, Lisp_Object base) | |
3603 | { | |
3604 | union specbinding *pdl = get_backtrace_frame (nframes, base); | |
3605 | ptrdiff_t count = SPECPDL_INDEX (); | |
3606 | ptrdiff_t distance = specpdl_ptr - pdl; | |
3607 | eassert (distance >= 0); | |
3608 | ||
3609 | if (!backtrace_p (pdl)) | |
3610 | error ("Activation frame not found!"); | |
3611 | ||
3612 | backtrace_eval_unrewind (distance); | |
3613 | record_unwind_protect_int (backtrace_eval_unrewind, -distance); | |
3614 | ||
3615 | /* Use eval_sub rather than Feval since the main motivation behind | |
3616 | backtrace-eval is to be able to get/set the value of lexical variables | |
3617 | from the debugger. */ | |
3618 | return unbind_to (count, eval_sub (exp)); | |
3619 | } | |
db9f0278 | 3620 | \f |
4ce0541e | 3621 | void |
2f592f95 | 3622 | mark_specpdl (void) |
4ce0541e | 3623 | { |
9349e5f7 | 3624 | union specbinding *pdl; |
2f592f95 | 3625 | for (pdl = specpdl; pdl != specpdl_ptr; pdl++) |
4ce0541e | 3626 | { |
2f592f95 SM |
3627 | switch (pdl->kind) |
3628 | { | |
3629 | case SPECPDL_UNWIND: | |
3630 | mark_object (specpdl_arg (pdl)); | |
3631 | break; | |
9349e5f7 | 3632 | |
2f592f95 SM |
3633 | case SPECPDL_BACKTRACE: |
3634 | { | |
3635 | ptrdiff_t nargs = backtrace_nargs (pdl); | |
3636 | mark_object (backtrace_function (pdl)); | |
3637 | if (nargs == UNEVALLED) | |
3638 | nargs = 1; | |
3639 | while (nargs--) | |
3640 | mark_object (backtrace_args (pdl)[nargs]); | |
3641 | } | |
3642 | break; | |
9349e5f7 | 3643 | |
2f592f95 SM |
3644 | case SPECPDL_LET_DEFAULT: |
3645 | case SPECPDL_LET_LOCAL: | |
3646 | mark_object (specpdl_where (pdl)); | |
9349e5f7 | 3647 | /* Fall through. */ |
2f592f95 SM |
3648 | case SPECPDL_LET: |
3649 | mark_object (specpdl_symbol (pdl)); | |
3650 | mark_object (specpdl_old_value (pdl)); | |
9349e5f7 | 3651 | break; |
2f592f95 SM |
3652 | } |
3653 | } | |
3654 | } | |
3655 | ||
3656 | void | |
3657 | get_backtrace (Lisp_Object array) | |
3658 | { | |
9349e5f7 | 3659 | union specbinding *pdl = backtrace_next (backtrace_top ()); |
2f592f95 | 3660 | ptrdiff_t i = 0, asize = ASIZE (array); |
4ce0541e | 3661 | |
2f592f95 SM |
3662 | /* Copy the backtrace contents into working memory. */ |
3663 | for (; i < asize; i++) | |
3664 | { | |
3665 | if (backtrace_p (pdl)) | |
3666 | { | |
3667 | ASET (array, i, backtrace_function (pdl)); | |
3668 | pdl = backtrace_next (pdl); | |
3669 | } | |
4ce0541e | 3670 | else |
2f592f95 | 3671 | ASET (array, i, Qnil); |
4ce0541e SM |
3672 | } |
3673 | } | |
2f592f95 SM |
3674 | |
3675 | Lisp_Object backtrace_top_function (void) | |
3676 | { | |
9349e5f7 | 3677 | union specbinding *pdl = backtrace_top (); |
2f592f95 SM |
3678 | return (backtrace_p (pdl) ? backtrace_function (pdl) : Qnil); |
3679 | } | |
4ce0541e | 3680 | |
dfcf069d | 3681 | void |
d3da34e0 | 3682 | syms_of_eval (void) |
db9f0278 | 3683 | { |
29208e82 | 3684 | DEFVAR_INT ("max-specpdl-size", max_specpdl_size, |
fb7ada5f | 3685 | doc: /* Limit on number of Lisp variable bindings and `unwind-protect's. |
9f5903bb | 3686 | If Lisp code tries to increase the total number past this amount, |
2520dc0c RS |
3687 | an error is signaled. |
3688 | You can safely use a value considerably larger than the default value, | |
3689 | if that proves inconveniently small. However, if you increase it too far, | |
3690 | Emacs could run out of memory trying to make the stack bigger. */); | |
db9f0278 | 3691 | |
29208e82 | 3692 | DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth, |
fb7ada5f | 3693 | doc: /* Limit on depth in `eval', `apply' and `funcall' before error. |
2520dc0c RS |
3694 | |
3695 | This limit serves to catch infinite recursions for you before they cause | |
9dbc9081 PJ |
3696 | actual stack overflow in C, which would be fatal for Emacs. |
3697 | You can safely make it considerably larger than its default value, | |
2520dc0c RS |
3698 | if that proves inconveniently small. However, if you increase it too far, |
3699 | Emacs could overflow the real C stack, and crash. */); | |
db9f0278 | 3700 | |
29208e82 | 3701 | DEFVAR_LISP ("quit-flag", Vquit_flag, |
9dbc9081 | 3702 | doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil. |
42ed718e RS |
3703 | If the value is t, that means do an ordinary quit. |
3704 | If the value equals `throw-on-input', that means quit by throwing | |
3705 | to the tag specified in `throw-on-input'; it's for handling `while-no-input'. | |
3706 | Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit', | |
3707 | but `inhibit-quit' non-nil prevents anything from taking notice of that. */); | |
db9f0278 JB |
3708 | Vquit_flag = Qnil; |
3709 | ||
29208e82 | 3710 | DEFVAR_LISP ("inhibit-quit", Vinhibit_quit, |
9dbc9081 PJ |
3711 | doc: /* Non-nil inhibits C-g quitting from happening immediately. |
3712 | Note that `quit-flag' will still be set by typing C-g, | |
3713 | so a quit will be signaled as soon as `inhibit-quit' is nil. | |
3714 | To prevent this happening, set `quit-flag' to nil | |
3715 | before making `inhibit-quit' nil. */); | |
db9f0278 JB |
3716 | Vinhibit_quit = Qnil; |
3717 | ||
cd3520a4 JB |
3718 | DEFSYM (Qinhibit_quit, "inhibit-quit"); |
3719 | DEFSYM (Qautoload, "autoload"); | |
45b82ad0 | 3720 | DEFSYM (Qinhibit_debugger, "inhibit-debugger"); |
cd3520a4 JB |
3721 | DEFSYM (Qmacro, "macro"); |
3722 | DEFSYM (Qdeclare, "declare"); | |
177c0ea7 | 3723 | |
db9f0278 JB |
3724 | /* Note that the process handling also uses Qexit, but we don't want |
3725 | to staticpro it twice, so we just do it here. */ | |
cd3520a4 | 3726 | DEFSYM (Qexit, "exit"); |
b9598260 | 3727 | |
cd3520a4 JB |
3728 | DEFSYM (Qinteractive, "interactive"); |
3729 | DEFSYM (Qcommandp, "commandp"); | |
cd3520a4 JB |
3730 | DEFSYM (Qand_rest, "&rest"); |
3731 | DEFSYM (Qand_optional, "&optional"); | |
3732 | DEFSYM (Qclosure, "closure"); | |
3733 | DEFSYM (Qdebug, "debug"); | |
f01cbfdd | 3734 | |
45b82ad0 SM |
3735 | DEFVAR_LISP ("inhibit-debugger", Vinhibit_debugger, |
3736 | doc: /* Non-nil means never enter the debugger. | |
3737 | Normally set while the debugger is already active, to avoid recursive | |
3738 | invocations. */); | |
3739 | Vinhibit_debugger = Qnil; | |
3740 | ||
29208e82 | 3741 | DEFVAR_LISP ("debug-on-error", Vdebug_on_error, |
fb7ada5f | 3742 | doc: /* Non-nil means enter debugger if an error is signaled. |
9dbc9081 PJ |
3743 | Does not apply to errors handled by `condition-case' or those |
3744 | matched by `debug-ignored-errors'. | |
3745 | If the value is a list, an error only means to enter the debugger | |
3746 | if one of its condition symbols appears in the list. | |
3747 | When you evaluate an expression interactively, this variable | |
3748 | is temporarily non-nil if `eval-expression-debug-on-error' is non-nil. | |
fbbdcf2f | 3749 | The command `toggle-debug-on-error' toggles this. |
45b82ad0 | 3750 | See also the variable `debug-on-quit' and `inhibit-debugger'. */); |
128c0f66 | 3751 | Vdebug_on_error = Qnil; |
db9f0278 | 3752 | |
29208e82 | 3753 | DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors, |
fb7ada5f | 3754 | doc: /* List of errors for which the debugger should not be called. |
9dbc9081 PJ |
3755 | Each element may be a condition-name or a regexp that matches error messages. |
3756 | If any element applies to a given error, that error skips the debugger | |
3757 | and just returns to top level. | |
3758 | This overrides the variable `debug-on-error'. | |
3759 | It does not apply to errors handled by `condition-case'. */); | |
fc950e09 KH |
3760 | Vdebug_ignored_errors = Qnil; |
3761 | ||
29208e82 | 3762 | DEFVAR_BOOL ("debug-on-quit", debug_on_quit, |
fb7ada5f | 3763 | doc: /* Non-nil means enter debugger if quit is signaled (C-g, for example). |
82fc29a1 | 3764 | Does not apply if quit is handled by a `condition-case'. */); |
db9f0278 JB |
3765 | debug_on_quit = 0; |
3766 | ||
29208e82 | 3767 | DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call, |
9dbc9081 | 3768 | doc: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */); |
db9f0278 | 3769 | |
29208e82 | 3770 | DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue, |
9dbc9081 PJ |
3771 | doc: /* Non-nil means debugger may continue execution. |
3772 | This is nil when the debugger is called under circumstances where it | |
3773 | might not be safe to continue. */); | |
dac204bc | 3774 | debugger_may_continue = 1; |
556d7314 | 3775 | |
29208e82 | 3776 | DEFVAR_LISP ("debugger", Vdebugger, |
9dbc9081 PJ |
3777 | doc: /* Function to call to invoke debugger. |
3778 | If due to frame exit, args are `exit' and the value being returned; | |
3779 | this function's value will be returned instead of that. | |
3780 | If due to error, args are `error' and a list of the args to `signal'. | |
3781 | If due to `apply' or `funcall' entry, one arg, `lambda'. | |
3782 | If due to `eval' entry, one arg, t. */); | |
db9f0278 JB |
3783 | Vdebugger = Qnil; |
3784 | ||
29208e82 | 3785 | DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function, |
9dbc9081 PJ |
3786 | doc: /* If non-nil, this is a function for `signal' to call. |
3787 | It receives the same arguments that `signal' was given. | |
3788 | The Edebug package uses this to regain control. */); | |
61ede770 RS |
3789 | Vsignal_hook_function = Qnil; |
3790 | ||
29208e82 | 3791 | DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal, |
fb7ada5f | 3792 | doc: /* Non-nil means call the debugger regardless of condition handlers. |
9dbc9081 PJ |
3793 | Note that `debug-on-error', `debug-on-quit' and friends |
3794 | still determine whether to handle the particular condition. */); | |
57a6e758 | 3795 | Vdebug_on_signal = Qnil; |
61ede770 | 3796 | |
b38b1ec0 | 3797 | /* When lexical binding is being used, |
61b108cc | 3798 | Vinternal_interpreter_environment is non-nil, and contains an alist |
b38b1ec0 SM |
3799 | of lexically-bound variable, or (t), indicating an empty |
3800 | environment. The lisp name of this variable would be | |
3801 | `internal-interpreter-environment' if it weren't hidden. | |
3802 | Every element of this list can be either a cons (VAR . VAL) | |
3803 | specifying a lexical binding, or a single symbol VAR indicating | |
3804 | that this variable should use dynamic scoping. */ | |
61b108cc SM |
3805 | DEFSYM (Qinternal_interpreter_environment, |
3806 | "internal-interpreter-environment"); | |
b38b1ec0 SM |
3807 | DEFVAR_LISP ("internal-interpreter-environment", |
3808 | Vinternal_interpreter_environment, | |
b9598260 SM |
3809 | doc: /* If non-nil, the current lexical environment of the lisp interpreter. |
3810 | When lexical binding is not being used, this variable is nil. | |
3811 | A value of `(t)' indicates an empty environment, otherwise it is an | |
3812 | alist of active lexical bindings. */); | |
3813 | Vinternal_interpreter_environment = Qnil; | |
c80e3b4a | 3814 | /* Don't export this variable to Elisp, so no one can mess with it |
b38b1ec0 SM |
3815 | (Just imagine if someone makes it buffer-local). */ |
3816 | Funintern (Qinternal_interpreter_environment, Qnil); | |
b9598260 | 3817 | |
cd3520a4 | 3818 | DEFSYM (Vrun_hooks, "run-hooks"); |
db9f0278 JB |
3819 | |
3820 | staticpro (&Vautoload_queue); | |
3821 | Vautoload_queue = Qnil; | |
a2ff3819 GM |
3822 | staticpro (&Vsignaling_function); |
3823 | Vsignaling_function = Qnil; | |
db9f0278 | 3824 | |
d1f55f16 CY |
3825 | inhibit_lisp_code = Qnil; |
3826 | ||
db9f0278 JB |
3827 | defsubr (&Sor); |
3828 | defsubr (&Sand); | |
3829 | defsubr (&Sif); | |
3830 | defsubr (&Scond); | |
3831 | defsubr (&Sprogn); | |
3832 | defsubr (&Sprog1); | |
3833 | defsubr (&Sprog2); | |
3834 | defsubr (&Ssetq); | |
3835 | defsubr (&Squote); | |
3836 | defsubr (&Sfunction); | |
a104f656 SM |
3837 | defsubr (&Sdefault_toplevel_value); |
3838 | defsubr (&Sset_default_toplevel_value); | |
db9f0278 | 3839 | defsubr (&Sdefvar); |
19cebf5a | 3840 | defsubr (&Sdefvaralias); |
db9f0278 | 3841 | defsubr (&Sdefconst); |
513749ee | 3842 | defsubr (&Smake_var_non_special); |
db9f0278 JB |
3843 | defsubr (&Slet); |
3844 | defsubr (&SletX); | |
3845 | defsubr (&Swhile); | |
3846 | defsubr (&Smacroexpand); | |
3847 | defsubr (&Scatch); | |
3848 | defsubr (&Sthrow); | |
3849 | defsubr (&Sunwind_protect); | |
3850 | defsubr (&Scondition_case); | |
3851 | defsubr (&Ssignal); | |
db9f0278 JB |
3852 | defsubr (&Scommandp); |
3853 | defsubr (&Sautoload); | |
7abaf5cc | 3854 | defsubr (&Sautoload_do_load); |
db9f0278 JB |
3855 | defsubr (&Seval); |
3856 | defsubr (&Sapply); | |
3857 | defsubr (&Sfuncall); | |
ff936e53 SM |
3858 | defsubr (&Srun_hooks); |
3859 | defsubr (&Srun_hook_with_args); | |
3860 | defsubr (&Srun_hook_with_args_until_success); | |
3861 | defsubr (&Srun_hook_with_args_until_failure); | |
f6d62986 | 3862 | defsubr (&Srun_hook_wrapped); |
661c7d6e | 3863 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
3864 | defsubr (&Sbacktrace_debug); |
3865 | defsubr (&Sbacktrace); | |
3866 | defsubr (&Sbacktrace_frame); | |
56ea7291 | 3867 | defsubr (&Sbacktrace_eval); |
4a330052 | 3868 | defsubr (&Sspecial_variable_p); |
b9598260 | 3869 | defsubr (&Sfunctionp); |
db9f0278 | 3870 | } |