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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
96277b2d | 2 | Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995 Free Software Foundation, Inc. |
db9f0278 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
96277b2d | 8 | the Free Software Foundation; either version 2, or (at your option) |
db9f0278 JB |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
18160b98 | 21 | #include <config.h> |
db9f0278 | 22 | #include "lisp.h" |
9ac0d9e0 | 23 | #include "blockinput.h" |
db9f0278 JB |
24 | |
25 | #ifndef standalone | |
26 | #include "commands.h" | |
1f98fa48 | 27 | #include "keyboard.h" |
db9f0278 JB |
28 | #else |
29 | #define INTERACTIVE 1 | |
30 | #endif | |
31 | ||
32 | #include <setjmp.h> | |
33 | ||
34 | /* This definition is duplicated in alloc.c and keyboard.c */ | |
35 | /* Putting it in lisp.h makes cc bomb out! */ | |
36 | ||
37 | struct backtrace | |
38 | { | |
39 | struct backtrace *next; | |
40 | Lisp_Object *function; | |
41 | Lisp_Object *args; /* Points to vector of args. */ | |
daa37602 JB |
42 | int nargs; /* Length of vector. |
43 | If nargs is UNEVALLED, args points to slot holding | |
44 | list of unevalled args */ | |
db9f0278 JB |
45 | char evalargs; |
46 | /* Nonzero means call value of debugger when done with this operation. */ | |
47 | char debug_on_exit; | |
48 | }; | |
49 | ||
50 | struct backtrace *backtrace_list; | |
51 | ||
82da7701 JB |
52 | /* This structure helps implement the `catch' and `throw' control |
53 | structure. A struct catchtag contains all the information needed | |
54 | to restore the state of the interpreter after a non-local jump. | |
55 | ||
56 | Handlers for error conditions (represented by `struct handler' | |
57 | structures) just point to a catch tag to do the cleanup required | |
58 | for their jumps. | |
59 | ||
60 | catchtag structures are chained together in the C calling stack; | |
61 | the `next' member points to the next outer catchtag. | |
62 | ||
63 | A call like (throw TAG VAL) searches for a catchtag whose `tag' | |
64 | member is TAG, and then unbinds to it. The `val' member is used to | |
65 | hold VAL while the stack is unwound; `val' is returned as the value | |
66 | of the catch form. | |
67 | ||
68 | All the other members are concerned with restoring the interpreter | |
69 | state. */ | |
db9f0278 JB |
70 | struct catchtag |
71 | { | |
72 | Lisp_Object tag; | |
73 | Lisp_Object val; | |
74 | struct catchtag *next; | |
75 | struct gcpro *gcpro; | |
76 | jmp_buf jmp; | |
77 | struct backtrace *backlist; | |
78 | struct handler *handlerlist; | |
79 | int lisp_eval_depth; | |
80 | int pdlcount; | |
81 | int poll_suppress_count; | |
82 | }; | |
83 | ||
84 | struct catchtag *catchlist; | |
85 | ||
86 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; | |
ad236261 | 87 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
db9f0278 JB |
88 | Lisp_Object Qmocklisp_arguments, Vmocklisp_arguments, Qmocklisp; |
89 | Lisp_Object Qand_rest, Qand_optional; | |
90 | Lisp_Object Qdebug_on_error; | |
91 | ||
92 | Lisp_Object Vrun_hooks; | |
93 | ||
94 | /* Non-nil means record all fset's and provide's, to be undone | |
95 | if the file being autoloaded is not fully loaded. | |
96 | They are recorded by being consed onto the front of Vautoload_queue: | |
97 | (FUN . ODEF) for a defun, (OFEATURES . nil) for a provide. */ | |
98 | ||
99 | Lisp_Object Vautoload_queue; | |
100 | ||
101 | /* Current number of specbindings allocated in specpdl. */ | |
102 | int specpdl_size; | |
103 | ||
104 | /* Pointer to beginning of specpdl. */ | |
105 | struct specbinding *specpdl; | |
106 | ||
107 | /* Pointer to first unused element in specpdl. */ | |
108 | struct specbinding *specpdl_ptr; | |
109 | ||
110 | /* Maximum size allowed for specpdl allocation */ | |
111 | int max_specpdl_size; | |
112 | ||
113 | /* Depth in Lisp evaluations and function calls. */ | |
114 | int lisp_eval_depth; | |
115 | ||
116 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
117 | int max_lisp_eval_depth; | |
118 | ||
119 | /* Nonzero means enter debugger before next function call */ | |
120 | int debug_on_next_call; | |
121 | ||
128c0f66 | 122 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 123 | if an error is handled by the command loop's error handler. */ |
128c0f66 | 124 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 125 | |
128c0f66 | 126 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 127 | if an error is handled by the command loop's error handler. */ |
128c0f66 | 128 | Lisp_Object Vdebug_on_error; |
db9f0278 JB |
129 | |
130 | /* Nonzero means enter debugger if a quit signal | |
128c0f66 | 131 | is handled by the command loop's error handler. */ |
db9f0278 JB |
132 | int debug_on_quit; |
133 | ||
82da7701 JB |
134 | /* The value of num_nonmacro_input_chars as of the last time we |
135 | started to enter the debugger. If we decide to enter the debugger | |
136 | again when this is still equal to num_nonmacro_input_chars, then we | |
137 | know that the debugger itself has an error, and we should just | |
138 | signal the error instead of entering an infinite loop of debugger | |
139 | invocations. */ | |
140 | int when_entered_debugger; | |
db9f0278 JB |
141 | |
142 | Lisp_Object Vdebugger; | |
143 | ||
144 | void specbind (), record_unwind_protect (); | |
145 | ||
146 | Lisp_Object funcall_lambda (); | |
147 | extern Lisp_Object ml_apply (); /* Apply a mocklisp function to unevaluated argument list */ | |
148 | ||
149 | init_eval_once () | |
150 | { | |
151 | specpdl_size = 50; | |
716acfce | 152 | specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct specbinding)); |
db9f0278 JB |
153 | max_specpdl_size = 600; |
154 | max_lisp_eval_depth = 200; | |
34d470ba RS |
155 | |
156 | Vrun_hooks = Qnil; | |
db9f0278 JB |
157 | } |
158 | ||
159 | init_eval () | |
160 | { | |
161 | specpdl_ptr = specpdl; | |
162 | catchlist = 0; | |
163 | handlerlist = 0; | |
164 | backtrace_list = 0; | |
165 | Vquit_flag = Qnil; | |
166 | debug_on_next_call = 0; | |
167 | lisp_eval_depth = 0; | |
b5b911f9 RS |
168 | /* This is less than the initial value of num_nonmacro_input_chars. */ |
169 | when_entered_debugger = -1; | |
db9f0278 JB |
170 | } |
171 | ||
172 | Lisp_Object | |
173 | call_debugger (arg) | |
174 | Lisp_Object arg; | |
175 | { | |
176 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
177 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
178 | if (specpdl_size + 40 > max_specpdl_size) | |
179 | max_specpdl_size = specpdl_size + 40; | |
180 | debug_on_next_call = 0; | |
82da7701 | 181 | when_entered_debugger = num_nonmacro_input_chars; |
db9f0278 JB |
182 | return apply1 (Vdebugger, arg); |
183 | } | |
184 | ||
185 | do_debug_on_call (code) | |
186 | Lisp_Object code; | |
187 | { | |
188 | debug_on_next_call = 0; | |
189 | backtrace_list->debug_on_exit = 1; | |
190 | call_debugger (Fcons (code, Qnil)); | |
191 | } | |
192 | \f | |
193 | /* NOTE!!! Every function that can call EVAL must protect its args | |
194 | and temporaries from garbage collection while it needs them. | |
195 | The definition of `For' shows what you have to do. */ | |
196 | ||
197 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
198 | "Eval args until one of them yields non-nil, then return that value.\n\ | |
199 | The remaining args are not evalled at all.\n\ | |
200 | If all args return nil, return nil.") | |
201 | (args) | |
202 | Lisp_Object args; | |
203 | { | |
204 | register Lisp_Object val; | |
205 | Lisp_Object args_left; | |
206 | struct gcpro gcpro1; | |
207 | ||
265a9e55 | 208 | if (NILP(args)) |
db9f0278 JB |
209 | return Qnil; |
210 | ||
211 | args_left = args; | |
212 | GCPRO1 (args_left); | |
213 | ||
214 | do | |
215 | { | |
216 | val = Feval (Fcar (args_left)); | |
265a9e55 | 217 | if (!NILP (val)) |
db9f0278 JB |
218 | break; |
219 | args_left = Fcdr (args_left); | |
220 | } | |
265a9e55 | 221 | while (!NILP(args_left)); |
db9f0278 JB |
222 | |
223 | UNGCPRO; | |
224 | return val; | |
225 | } | |
226 | ||
227 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
228 | "Eval args until one of them yields nil, then return nil.\n\ | |
229 | The remaining args are not evalled at all.\n\ | |
230 | If no arg yields nil, return the last arg's value.") | |
231 | (args) | |
232 | Lisp_Object args; | |
233 | { | |
234 | register Lisp_Object val; | |
235 | Lisp_Object args_left; | |
236 | struct gcpro gcpro1; | |
237 | ||
265a9e55 | 238 | if (NILP(args)) |
db9f0278 JB |
239 | return Qt; |
240 | ||
241 | args_left = args; | |
242 | GCPRO1 (args_left); | |
243 | ||
244 | do | |
245 | { | |
246 | val = Feval (Fcar (args_left)); | |
265a9e55 | 247 | if (NILP (val)) |
db9f0278 JB |
248 | break; |
249 | args_left = Fcdr (args_left); | |
250 | } | |
265a9e55 | 251 | while (!NILP(args_left)); |
db9f0278 JB |
252 | |
253 | UNGCPRO; | |
254 | return val; | |
255 | } | |
256 | ||
257 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
258 | "(if COND THEN ELSE...): if COND yields non-nil, do THEN, else do ELSE...\n\ | |
259 | Returns the value of THEN or the value of the last of the ELSE's.\n\ | |
260 | THEN must be one expression, but ELSE... can be zero or more expressions.\n\ | |
261 | If COND yields nil, and there are no ELSE's, the value is nil.") | |
262 | (args) | |
263 | Lisp_Object args; | |
264 | { | |
265 | register Lisp_Object cond; | |
266 | struct gcpro gcpro1; | |
267 | ||
268 | GCPRO1 (args); | |
269 | cond = Feval (Fcar (args)); | |
270 | UNGCPRO; | |
271 | ||
265a9e55 | 272 | if (!NILP (cond)) |
db9f0278 JB |
273 | return Feval (Fcar (Fcdr (args))); |
274 | return Fprogn (Fcdr (Fcdr (args))); | |
275 | } | |
276 | ||
277 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
278 | "(cond CLAUSES...): try each clause until one succeeds.\n\ | |
279 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated\n\ | |
280 | and, if the value is non-nil, this clause succeeds:\n\ | |
281 | then the expressions in BODY are evaluated and the last one's\n\ | |
282 | value is the value of the cond-form.\n\ | |
283 | If no clause succeeds, cond returns nil.\n\ | |
284 | If a clause has one element, as in (CONDITION),\n\ | |
285 | CONDITION's value if non-nil is returned from the cond-form.") | |
286 | (args) | |
287 | Lisp_Object args; | |
288 | { | |
289 | register Lisp_Object clause, val; | |
290 | struct gcpro gcpro1; | |
291 | ||
292 | val = Qnil; | |
293 | GCPRO1 (args); | |
265a9e55 | 294 | while (!NILP (args)) |
db9f0278 JB |
295 | { |
296 | clause = Fcar (args); | |
297 | val = Feval (Fcar (clause)); | |
265a9e55 | 298 | if (!NILP (val)) |
db9f0278 JB |
299 | { |
300 | if (!EQ (XCONS (clause)->cdr, Qnil)) | |
301 | val = Fprogn (XCONS (clause)->cdr); | |
302 | break; | |
303 | } | |
304 | args = XCONS (args)->cdr; | |
305 | } | |
306 | UNGCPRO; | |
307 | ||
308 | return val; | |
309 | } | |
310 | ||
311 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
312 | "(progn BODY...): eval BODY forms sequentially and return value of last one.") | |
313 | (args) | |
314 | Lisp_Object args; | |
315 | { | |
316 | register Lisp_Object val, tem; | |
317 | Lisp_Object args_left; | |
318 | struct gcpro gcpro1; | |
319 | ||
320 | /* In Mocklisp code, symbols at the front of the progn arglist | |
321 | are to be bound to zero. */ | |
322 | if (!EQ (Vmocklisp_arguments, Qt)) | |
323 | { | |
324 | val = make_number (0); | |
90165123 | 325 | while (!NILP (args) && (tem = Fcar (args), SYMBOLP (tem))) |
db9f0278 JB |
326 | { |
327 | QUIT; | |
328 | specbind (tem, val), args = Fcdr (args); | |
329 | } | |
330 | } | |
331 | ||
265a9e55 | 332 | if (NILP(args)) |
db9f0278 JB |
333 | return Qnil; |
334 | ||
335 | args_left = args; | |
336 | GCPRO1 (args_left); | |
337 | ||
338 | do | |
339 | { | |
340 | val = Feval (Fcar (args_left)); | |
341 | args_left = Fcdr (args_left); | |
342 | } | |
265a9e55 | 343 | while (!NILP(args_left)); |
db9f0278 JB |
344 | |
345 | UNGCPRO; | |
346 | return val; | |
347 | } | |
348 | ||
349 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
350 | "(prog1 FIRST BODY...): eval FIRST and BODY sequentially; value from FIRST.\n\ | |
351 | The value of FIRST is saved during the evaluation of the remaining args,\n\ | |
352 | whose values are discarded.") | |
353 | (args) | |
354 | Lisp_Object args; | |
355 | { | |
356 | Lisp_Object val; | |
357 | register Lisp_Object args_left; | |
358 | struct gcpro gcpro1, gcpro2; | |
359 | register int argnum = 0; | |
360 | ||
265a9e55 | 361 | if (NILP(args)) |
db9f0278 JB |
362 | return Qnil; |
363 | ||
364 | args_left = args; | |
365 | val = Qnil; | |
366 | GCPRO2 (args, val); | |
367 | ||
368 | do | |
369 | { | |
370 | if (!(argnum++)) | |
371 | val = Feval (Fcar (args_left)); | |
372 | else | |
373 | Feval (Fcar (args_left)); | |
374 | args_left = Fcdr (args_left); | |
375 | } | |
265a9e55 | 376 | while (!NILP(args_left)); |
db9f0278 JB |
377 | |
378 | UNGCPRO; | |
379 | return val; | |
380 | } | |
381 | ||
382 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
877b578f | 383 | "(prog2 X Y BODY...): eval X, Y and BODY sequentially; value from Y.\n\ |
db9f0278 JB |
384 | The value of Y is saved during the evaluation of the remaining args,\n\ |
385 | whose values are discarded.") | |
386 | (args) | |
387 | Lisp_Object args; | |
388 | { | |
389 | Lisp_Object val; | |
390 | register Lisp_Object args_left; | |
391 | struct gcpro gcpro1, gcpro2; | |
392 | register int argnum = -1; | |
393 | ||
394 | val = Qnil; | |
395 | ||
87d238ba | 396 | if (NILP (args)) |
db9f0278 JB |
397 | return Qnil; |
398 | ||
399 | args_left = args; | |
400 | val = Qnil; | |
401 | GCPRO2 (args, val); | |
402 | ||
403 | do | |
404 | { | |
405 | if (!(argnum++)) | |
406 | val = Feval (Fcar (args_left)); | |
407 | else | |
408 | Feval (Fcar (args_left)); | |
409 | args_left = Fcdr (args_left); | |
410 | } | |
87d238ba | 411 | while (!NILP (args_left)); |
db9f0278 JB |
412 | |
413 | UNGCPRO; | |
414 | return val; | |
415 | } | |
416 | ||
417 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
418 | "(setq SYM VAL SYM VAL ...): set each SYM to the value of its VAL.\n\ | |
b0d75191 RS |
419 | The symbols SYM are variables; they are literal (not evaluated).\n\ |
420 | The values VAL are expressions; they are evaluated.\n\ | |
421 | Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.\n\ | |
422 | The second VAL is not computed until after the first SYM is set, and so on;\n\ | |
423 | each VAL can use the new value of variables set earlier in the `setq'.\n\ | |
196e7d3f | 424 | The return value of the `setq' form is the value of the last VAL.") |
db9f0278 JB |
425 | (args) |
426 | Lisp_Object args; | |
427 | { | |
428 | register Lisp_Object args_left; | |
429 | register Lisp_Object val, sym; | |
430 | struct gcpro gcpro1; | |
431 | ||
265a9e55 | 432 | if (NILP(args)) |
db9f0278 JB |
433 | return Qnil; |
434 | ||
435 | args_left = args; | |
436 | GCPRO1 (args); | |
437 | ||
438 | do | |
439 | { | |
440 | val = Feval (Fcar (Fcdr (args_left))); | |
441 | sym = Fcar (args_left); | |
442 | Fset (sym, val); | |
443 | args_left = Fcdr (Fcdr (args_left)); | |
444 | } | |
265a9e55 | 445 | while (!NILP(args_left)); |
db9f0278 JB |
446 | |
447 | UNGCPRO; | |
448 | return val; | |
449 | } | |
450 | ||
451 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, | |
452 | "Return the argument, without evaluating it. `(quote x)' yields `x'.") | |
453 | (args) | |
454 | Lisp_Object args; | |
455 | { | |
456 | return Fcar (args); | |
457 | } | |
458 | ||
459 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, | |
460 | "Like `quote', but preferred for objects which are functions.\n\ | |
461 | In byte compilation, `function' causes its argument to be compiled.\n\ | |
462 | `quote' cannot do that.") | |
463 | (args) | |
464 | Lisp_Object args; | |
465 | { | |
466 | return Fcar (args); | |
467 | } | |
468 | ||
469 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, | |
470 | "Return t if function in which this appears was called interactively.\n\ | |
471 | This means that the function was called with call-interactively (which\n\ | |
472 | includes being called as the binding of a key)\n\ | |
473 | and input is currently coming from the keyboard (not in keyboard macro).") | |
474 | () | |
475 | { | |
476 | register struct backtrace *btp; | |
477 | register Lisp_Object fun; | |
478 | ||
479 | if (!INTERACTIVE) | |
480 | return Qnil; | |
481 | ||
db9f0278 | 482 | btp = backtrace_list; |
daa37602 JB |
483 | |
484 | /* If this isn't a byte-compiled function, there may be a frame at | |
485 | the top for Finteractive_p itself. If so, skip it. */ | |
486 | fun = Findirect_function (*btp->function); | |
0598f773 | 487 | if (SUBRP (fun) && XSUBR (fun) == &Sinteractive_p) |
db9f0278 | 488 | btp = btp->next; |
daa37602 JB |
489 | |
490 | /* If we're running an Emacs 18-style byte-compiled function, there | |
491 | may be a frame for Fbytecode. Now, given the strictest | |
492 | definition, this function isn't really being called | |
493 | interactively, but because that's the way Emacs 18 always builds | |
494 | byte-compiled functions, we'll accept it for now. */ | |
495 | if (EQ (*btp->function, Qbytecode)) | |
496 | btp = btp->next; | |
497 | ||
498 | /* If this isn't a byte-compiled function, then we may now be | |
499 | looking at several frames for special forms. Skip past them. */ | |
500 | while (btp && | |
501 | btp->nargs == UNEVALLED) | |
a6e3fa71 JB |
502 | btp = btp->next; |
503 | ||
daa37602 JB |
504 | /* btp now points at the frame of the innermost function that isn't |
505 | a special form, ignoring frames for Finteractive_p and/or | |
506 | Fbytecode at the top. If this frame is for a built-in function | |
507 | (such as load or eval-region) return nil. */ | |
ffd56f97 | 508 | fun = Findirect_function (*btp->function); |
90165123 | 509 | if (SUBRP (fun)) |
db9f0278 JB |
510 | return Qnil; |
511 | /* btp points to the frame of a Lisp function that called interactive-p. | |
512 | Return t if that function was called interactively. */ | |
513 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
514 | return Qt; | |
515 | return Qnil; | |
516 | } | |
517 | ||
518 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, | |
519 | "(defun NAME ARGLIST [DOCSTRING] BODY...): define NAME as a function.\n\ | |
520 | The definition is (lambda ARGLIST [DOCSTRING] BODY...).\n\ | |
521 | See also the function `interactive'.") | |
522 | (args) | |
523 | Lisp_Object args; | |
524 | { | |
525 | register Lisp_Object fn_name; | |
526 | register Lisp_Object defn; | |
527 | ||
528 | fn_name = Fcar (args); | |
529 | defn = Fcons (Qlambda, Fcdr (args)); | |
265a9e55 | 530 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
531 | defn = Fpurecopy (defn); |
532 | Ffset (fn_name, defn); | |
2a49b6e5 | 533 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
534 | return fn_name; |
535 | } | |
536 | ||
537 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
538 | "(defmacro NAME ARGLIST [DOCSTRING] BODY...): define NAME as a macro.\n\ | |
539 | The definition is (macro lambda ARGLIST [DOCSTRING] BODY...).\n\ | |
540 | When the macro is called, as in (NAME ARGS...),\n\ | |
541 | the function (lambda ARGLIST BODY...) is applied to\n\ | |
542 | the list ARGS... as it appears in the expression,\n\ | |
543 | and the result should be a form to be evaluated instead of the original.") | |
544 | (args) | |
545 | Lisp_Object args; | |
546 | { | |
547 | register Lisp_Object fn_name; | |
548 | register Lisp_Object defn; | |
549 | ||
550 | fn_name = Fcar (args); | |
551 | defn = Fcons (Qmacro, Fcons (Qlambda, Fcdr (args))); | |
265a9e55 | 552 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
553 | defn = Fpurecopy (defn); |
554 | Ffset (fn_name, defn); | |
2a49b6e5 | 555 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
556 | return fn_name; |
557 | } | |
558 | ||
559 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, | |
560 | "(defvar SYMBOL INITVALUE DOCSTRING): define SYMBOL as a variable.\n\ | |
561 | You are not required to define a variable in order to use it,\n\ | |
562 | but the definition can supply documentation and an initial value\n\ | |
563 | in a way that tags can recognize.\n\n\ | |
564 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.\n\ | |
06ef7355 RS |
565 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
566 | buffer-local values are not affected.\n\ | |
db9f0278 JB |
567 | INITVALUE and DOCSTRING are optional.\n\ |
568 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ | |
569 | This means that M-x set-variable and M-x edit-options recognize it.\n\ | |
570 | If INITVALUE is missing, SYMBOL's value is not set.") | |
571 | (args) | |
572 | Lisp_Object args; | |
573 | { | |
a42ba017 | 574 | register Lisp_Object sym, tem, tail; |
db9f0278 JB |
575 | |
576 | sym = Fcar (args); | |
a42ba017 RS |
577 | tail = Fcdr (args); |
578 | if (!NILP (Fcdr (Fcdr (tail)))) | |
579 | error ("too many arguments"); | |
580 | ||
581 | if (!NILP (tail)) | |
db9f0278 JB |
582 | { |
583 | tem = Fdefault_boundp (sym); | |
265a9e55 | 584 | if (NILP (tem)) |
db9f0278 JB |
585 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); |
586 | } | |
a42ba017 RS |
587 | tail = Fcdr (Fcdr (args)); |
588 | if (!NILP (Fcar (tail))) | |
db9f0278 | 589 | { |
ca248607 | 590 | tem = Fcar (tail); |
265a9e55 | 591 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
592 | tem = Fpurecopy (tem); |
593 | Fput (sym, Qvariable_documentation, tem); | |
594 | } | |
2a49b6e5 | 595 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
596 | return sym; |
597 | } | |
598 | ||
599 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
600 | "(defconst SYMBOL INITVALUE DOCSTRING): define SYMBOL as a constant variable.\n\ | |
601 | The intent is that programs do not change this value, but users may.\n\ | |
602 | Always sets the value of SYMBOL to the result of evalling INITVALUE.\n\ | |
06ef7355 RS |
603 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
604 | buffer-local values are not affected.\n\ | |
db9f0278 JB |
605 | DOCSTRING is optional.\n\ |
606 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ | |
607 | This means that M-x set-variable and M-x edit-options recognize it.\n\n\ | |
608 | Note: do not use `defconst' for user options in libraries that are not\n\ | |
609 | normally loaded, since it is useful for users to be able to specify\n\ | |
610 | their own values for such variables before loading the library.\n\ | |
611 | Since `defconst' unconditionally assigns the variable,\n\ | |
612 | it would override the user's choice.") | |
613 | (args) | |
614 | Lisp_Object args; | |
615 | { | |
616 | register Lisp_Object sym, tem; | |
617 | ||
618 | sym = Fcar (args); | |
a42ba017 RS |
619 | if (!NILP (Fcdr (Fcdr (Fcdr (args))))) |
620 | error ("too many arguments"); | |
621 | ||
db9f0278 JB |
622 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); |
623 | tem = Fcar (Fcdr (Fcdr (args))); | |
265a9e55 | 624 | if (!NILP (tem)) |
db9f0278 | 625 | { |
265a9e55 | 626 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
627 | tem = Fpurecopy (tem); |
628 | Fput (sym, Qvariable_documentation, tem); | |
629 | } | |
2a49b6e5 | 630 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
631 | return sym; |
632 | } | |
633 | ||
634 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, | |
635 | "Returns t if VARIABLE is intended to be set and modified by users.\n\ | |
636 | \(The alternative is a variable used internally in a Lisp program.)\n\ | |
637 | Determined by whether the first character of the documentation\n\ | |
65411977 | 638 | for the variable is `*'.") |
db9f0278 JB |
639 | (variable) |
640 | Lisp_Object variable; | |
641 | { | |
642 | Lisp_Object documentation; | |
643 | ||
644 | documentation = Fget (variable, Qvariable_documentation); | |
90165123 | 645 | if (INTEGERP (documentation) && XINT (documentation) < 0) |
db9f0278 | 646 | return Qt; |
65411977 RS |
647 | if (STRINGP (documentation) |
648 | && ((unsigned char) XSTRING (documentation)->data[0] == '*')) | |
649 | return Qt; | |
650 | /* If it is (STRING . INTEGER), a negative integer means a user variable. */ | |
651 | if (CONSP (documentation) | |
652 | && STRINGP (XCONS (documentation)->car) | |
653 | && INTEGERP (XCONS (documentation)->cdr) | |
654 | && XINT (XCONS (documentation)->cdr) < 0) | |
db9f0278 JB |
655 | return Qt; |
656 | return Qnil; | |
657 | } | |
658 | \f | |
659 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
660 | "(let* VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ | |
661 | The value of the last form in BODY is returned.\n\ | |
662 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
663 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
664 | Each VALUEFORM can refer to the symbols already bound by this VARLIST.") | |
665 | (args) | |
666 | Lisp_Object args; | |
667 | { | |
668 | Lisp_Object varlist, val, elt; | |
669 | int count = specpdl_ptr - specpdl; | |
670 | struct gcpro gcpro1, gcpro2, gcpro3; | |
671 | ||
672 | GCPRO3 (args, elt, varlist); | |
673 | ||
674 | varlist = Fcar (args); | |
265a9e55 | 675 | while (!NILP (varlist)) |
db9f0278 JB |
676 | { |
677 | QUIT; | |
678 | elt = Fcar (varlist); | |
90165123 | 679 | if (SYMBOLP (elt)) |
db9f0278 | 680 | specbind (elt, Qnil); |
08564963 JB |
681 | else if (! NILP (Fcdr (Fcdr (elt)))) |
682 | Fsignal (Qerror, | |
683 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
684 | elt)); | |
db9f0278 JB |
685 | else |
686 | { | |
687 | val = Feval (Fcar (Fcdr (elt))); | |
688 | specbind (Fcar (elt), val); | |
689 | } | |
690 | varlist = Fcdr (varlist); | |
691 | } | |
692 | UNGCPRO; | |
693 | val = Fprogn (Fcdr (args)); | |
694 | return unbind_to (count, val); | |
695 | } | |
696 | ||
697 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
698 | "(let VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ | |
699 | The value of the last form in BODY is returned.\n\ | |
700 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
701 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
702 | All the VALUEFORMs are evalled before any symbols are bound.") | |
703 | (args) | |
704 | Lisp_Object args; | |
705 | { | |
706 | Lisp_Object *temps, tem; | |
707 | register Lisp_Object elt, varlist; | |
708 | int count = specpdl_ptr - specpdl; | |
709 | register int argnum; | |
710 | struct gcpro gcpro1, gcpro2; | |
711 | ||
712 | varlist = Fcar (args); | |
713 | ||
714 | /* Make space to hold the values to give the bound variables */ | |
715 | elt = Flength (varlist); | |
716 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
717 | ||
718 | /* Compute the values and store them in `temps' */ | |
719 | ||
720 | GCPRO2 (args, *temps); | |
721 | gcpro2.nvars = 0; | |
722 | ||
265a9e55 | 723 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
724 | { |
725 | QUIT; | |
726 | elt = Fcar (varlist); | |
90165123 | 727 | if (SYMBOLP (elt)) |
db9f0278 | 728 | temps [argnum++] = Qnil; |
08564963 JB |
729 | else if (! NILP (Fcdr (Fcdr (elt)))) |
730 | Fsignal (Qerror, | |
731 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
732 | elt)); | |
db9f0278 JB |
733 | else |
734 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
735 | gcpro2.nvars = argnum; | |
736 | } | |
737 | UNGCPRO; | |
738 | ||
739 | varlist = Fcar (args); | |
265a9e55 | 740 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
741 | { |
742 | elt = Fcar (varlist); | |
743 | tem = temps[argnum++]; | |
90165123 | 744 | if (SYMBOLP (elt)) |
db9f0278 JB |
745 | specbind (elt, tem); |
746 | else | |
747 | specbind (Fcar (elt), tem); | |
748 | } | |
749 | ||
750 | elt = Fprogn (Fcdr (args)); | |
751 | return unbind_to (count, elt); | |
752 | } | |
753 | ||
754 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
755 | "(while TEST BODY...): if TEST yields non-nil, eval BODY... and repeat.\n\ | |
756 | The order of execution is thus TEST, BODY, TEST, BODY and so on\n\ | |
757 | until TEST returns nil.") | |
758 | (args) | |
759 | Lisp_Object args; | |
760 | { | |
761 | Lisp_Object test, body, tem; | |
762 | struct gcpro gcpro1, gcpro2; | |
763 | ||
764 | GCPRO2 (test, body); | |
765 | ||
766 | test = Fcar (args); | |
767 | body = Fcdr (args); | |
e3c24a74 RS |
768 | while (tem = Feval (test), |
769 | (!EQ (Vmocklisp_arguments, Qt) ? XINT (tem) : !NILP (tem))) | |
db9f0278 JB |
770 | { |
771 | QUIT; | |
772 | Fprogn (body); | |
773 | } | |
774 | ||
775 | UNGCPRO; | |
776 | return Qnil; | |
777 | } | |
778 | ||
779 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
780 | "Return result of expanding macros at top level of FORM.\n\ | |
781 | If FORM is not a macro call, it is returned unchanged.\n\ | |
782 | Otherwise, the macro is expanded and the expansion is considered\n\ | |
783 | in place of FORM. When a non-macro-call results, it is returned.\n\n\ | |
784 | The second optional arg ENVIRONMENT species an environment of macro\n\ | |
785 | definitions to shadow the loaded ones for use in file byte-compilation.") | |
786 | (form, env) | |
787 | register Lisp_Object form; | |
788 | Lisp_Object env; | |
789 | { | |
23d6b5a6 | 790 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
791 | register Lisp_Object expander, sym, def, tem; |
792 | ||
793 | while (1) | |
794 | { | |
795 | /* Come back here each time we expand a macro call, | |
796 | in case it expands into another macro call. */ | |
90165123 | 797 | if (!CONSP (form)) |
db9f0278 | 798 | break; |
23d6b5a6 JB |
799 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
800 | def = sym = XCONS (form)->car; | |
801 | tem = Qnil; | |
db9f0278 JB |
802 | /* Trace symbols aliases to other symbols |
803 | until we get a symbol that is not an alias. */ | |
90165123 | 804 | while (SYMBOLP (def)) |
db9f0278 JB |
805 | { |
806 | QUIT; | |
23d6b5a6 | 807 | sym = def; |
db9f0278 | 808 | tem = Fassq (sym, env); |
265a9e55 | 809 | if (NILP (tem)) |
db9f0278 JB |
810 | { |
811 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
812 | if (!EQ (def, Qunbound)) |
813 | continue; | |
db9f0278 | 814 | } |
23d6b5a6 | 815 | break; |
db9f0278 JB |
816 | } |
817 | /* Right now TEM is the result from SYM in ENV, | |
818 | and if TEM is nil then DEF is SYM's function definition. */ | |
265a9e55 | 819 | if (NILP (tem)) |
db9f0278 JB |
820 | { |
821 | /* SYM is not mentioned in ENV. | |
822 | Look at its function definition. */ | |
90165123 | 823 | if (EQ (def, Qunbound) || !CONSP (def)) |
db9f0278 JB |
824 | /* Not defined or definition not suitable */ |
825 | break; | |
826 | if (EQ (XCONS (def)->car, Qautoload)) | |
827 | { | |
828 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c | 829 | tem = Fnth (make_number (4), def); |
47ccd8b6 | 830 | if (EQ (tem, Qt) || EQ (tem, Qmacro)) |
ee9ee63c JB |
831 | /* Yes, load it and try again. */ |
832 | { | |
833 | do_autoload (def, sym); | |
834 | continue; | |
835 | } | |
836 | else | |
db9f0278 | 837 | break; |
db9f0278 JB |
838 | } |
839 | else if (!EQ (XCONS (def)->car, Qmacro)) | |
840 | break; | |
841 | else expander = XCONS (def)->cdr; | |
842 | } | |
843 | else | |
844 | { | |
845 | expander = XCONS (tem)->cdr; | |
265a9e55 | 846 | if (NILP (expander)) |
db9f0278 JB |
847 | break; |
848 | } | |
db9f0278 JB |
849 | form = apply1 (expander, XCONS (form)->cdr); |
850 | } | |
851 | return form; | |
852 | } | |
853 | \f | |
854 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
855 | "(catch TAG BODY...): eval BODY allowing nonlocal exits using `throw'.\n\ | |
856 | TAG is evalled to get the tag to use. Then the BODY is executed.\n\ | |
857 | Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.\n\ | |
858 | If no throw happens, `catch' returns the value of the last BODY form.\n\ | |
859 | If a throw happens, it specifies the value to return from `catch'.") | |
860 | (args) | |
861 | Lisp_Object args; | |
862 | { | |
863 | register Lisp_Object tag; | |
864 | struct gcpro gcpro1; | |
865 | ||
866 | GCPRO1 (args); | |
867 | tag = Feval (Fcar (args)); | |
868 | UNGCPRO; | |
869 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
870 | } | |
871 | ||
872 | /* Set up a catch, then call C function FUNC on argument ARG. | |
873 | FUNC should return a Lisp_Object. | |
874 | This is how catches are done from within C code. */ | |
875 | ||
876 | Lisp_Object | |
877 | internal_catch (tag, func, arg) | |
878 | Lisp_Object tag; | |
879 | Lisp_Object (*func) (); | |
880 | Lisp_Object arg; | |
881 | { | |
882 | /* This structure is made part of the chain `catchlist'. */ | |
883 | struct catchtag c; | |
884 | ||
885 | /* Fill in the components of c, and put it on the list. */ | |
886 | c.next = catchlist; | |
887 | c.tag = tag; | |
888 | c.val = Qnil; | |
889 | c.backlist = backtrace_list; | |
890 | c.handlerlist = handlerlist; | |
891 | c.lisp_eval_depth = lisp_eval_depth; | |
892 | c.pdlcount = specpdl_ptr - specpdl; | |
893 | c.poll_suppress_count = poll_suppress_count; | |
894 | c.gcpro = gcprolist; | |
895 | catchlist = &c; | |
896 | ||
897 | /* Call FUNC. */ | |
898 | if (! _setjmp (c.jmp)) | |
899 | c.val = (*func) (arg); | |
900 | ||
901 | /* Throw works by a longjmp that comes right here. */ | |
902 | catchlist = c.next; | |
903 | return c.val; | |
904 | } | |
905 | ||
ba410f40 JB |
906 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
907 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 908 | |
ba410f40 JB |
909 | This is the guts Fthrow and Fsignal; they differ only in the way |
910 | they choose the catch tag to throw to. A catch tag for a | |
911 | condition-case form has a TAG of Qnil. | |
db9f0278 | 912 | |
ba410f40 JB |
913 | Before each catch is discarded, unbind all special bindings and |
914 | execute all unwind-protect clauses made above that catch. Unwind | |
915 | the handler stack as we go, so that the proper handlers are in | |
916 | effect for each unwind-protect clause we run. At the end, restore | |
917 | some static info saved in CATCH, and longjmp to the location | |
918 | specified in the | |
919 | ||
920 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
921 | |
922 | static void | |
ba410f40 | 923 | unwind_to_catch (catch, value) |
db9f0278 | 924 | struct catchtag *catch; |
ba410f40 | 925 | Lisp_Object value; |
db9f0278 JB |
926 | { |
927 | register int last_time; | |
928 | ||
ba410f40 JB |
929 | /* Save the value in the tag. */ |
930 | catch->val = value; | |
931 | ||
82da7701 | 932 | /* Restore the polling-suppression count. */ |
1cdc3155 | 933 | set_poll_suppress_count (catch->poll_suppress_count); |
82da7701 | 934 | |
db9f0278 JB |
935 | do |
936 | { | |
937 | last_time = catchlist == catch; | |
82da7701 JB |
938 | |
939 | /* Unwind the specpdl stack, and then restore the proper set of | |
940 | handlers. */ | |
db9f0278 JB |
941 | unbind_to (catchlist->pdlcount, Qnil); |
942 | handlerlist = catchlist->handlerlist; | |
943 | catchlist = catchlist->next; | |
944 | } | |
945 | while (! last_time); | |
946 | ||
947 | gcprolist = catch->gcpro; | |
948 | backtrace_list = catch->backlist; | |
949 | lisp_eval_depth = catch->lisp_eval_depth; | |
ba410f40 JB |
950 | |
951 | _longjmp (catch->jmp, 1); | |
db9f0278 JB |
952 | } |
953 | ||
954 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
955 | "(throw TAG VALUE): throw to the catch for TAG and return VALUE from it.\n\ | |
956 | Both TAG and VALUE are evalled.") | |
957 | (tag, val) | |
958 | register Lisp_Object tag, val; | |
959 | { | |
960 | register struct catchtag *c; | |
961 | ||
962 | while (1) | |
963 | { | |
265a9e55 | 964 | if (!NILP (tag)) |
db9f0278 JB |
965 | for (c = catchlist; c; c = c->next) |
966 | { | |
967 | if (EQ (c->tag, tag)) | |
ba410f40 | 968 | unwind_to_catch (c, val); |
db9f0278 JB |
969 | } |
970 | tag = Fsignal (Qno_catch, Fcons (tag, Fcons (val, Qnil))); | |
971 | } | |
972 | } | |
973 | ||
974 | ||
975 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
976 | "Do BODYFORM, protecting with UNWINDFORMS.\n\ | |
977 | Usage looks like (unwind-protect BODYFORM UNWINDFORMS...).\n\ | |
978 | If BODYFORM completes normally, its value is returned\n\ | |
979 | after executing the UNWINDFORMS.\n\ | |
980 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.") | |
981 | (args) | |
982 | Lisp_Object args; | |
983 | { | |
984 | Lisp_Object val; | |
985 | int count = specpdl_ptr - specpdl; | |
986 | ||
987 | record_unwind_protect (0, Fcdr (args)); | |
988 | val = Feval (Fcar (args)); | |
989 | return unbind_to (count, val); | |
990 | } | |
991 | \f | |
992 | /* Chain of condition handlers currently in effect. | |
993 | The elements of this chain are contained in the stack frames | |
994 | of Fcondition_case and internal_condition_case. | |
995 | When an error is signaled (by calling Fsignal, below), | |
996 | this chain is searched for an element that applies. */ | |
997 | ||
998 | struct handler *handlerlist; | |
999 | ||
1000 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
1001 | "Regain control when an error is signaled.\n\ | |
1002 | Usage looks like (condition-case VAR BODYFORM HANDLERS...).\n\ | |
1003 | executes BODYFORM and returns its value if no error happens.\n\ | |
1004 | Each element of HANDLERS looks like (CONDITION-NAME BODY...)\n\ | |
1005 | where the BODY is made of Lisp expressions.\n\n\ | |
1006 | A handler is applicable to an error\n\ | |
1007 | if CONDITION-NAME is one of the error's condition names.\n\ | |
1008 | If an error happens, the first applicable handler is run.\n\ | |
1009 | \n\ | |
633357d4 RS |
1010 | The car of a handler may be a list of condition names\n\ |
1011 | instead of a single condition name.\n\ | |
1012 | \n\ | |
db9f0278 JB |
1013 | When a handler handles an error,\n\ |
1014 | control returns to the condition-case and the handler BODY... is executed\n\ | |
1015 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).\n\ | |
1016 | VAR may be nil; then you do not get access to the signal information.\n\ | |
1017 | \n\ | |
1018 | The value of the last BODY form is returned from the condition-case.\n\ | |
1019 | See also the function `signal' for more info.") | |
1020 | (args) | |
1021 | Lisp_Object args; | |
1022 | { | |
1023 | Lisp_Object val; | |
1024 | struct catchtag c; | |
1025 | struct handler h; | |
82da7701 | 1026 | register Lisp_Object var, bodyform, handlers; |
db9f0278 | 1027 | |
82da7701 JB |
1028 | var = Fcar (args); |
1029 | bodyform = Fcar (Fcdr (args)); | |
1030 | handlers = Fcdr (Fcdr (args)); | |
1031 | CHECK_SYMBOL (var, 0); | |
1032 | ||
1033 | for (val = handlers; ! NILP (val); val = Fcdr (val)) | |
1034 | { | |
1035 | Lisp_Object tem; | |
1036 | tem = Fcar (val); | |
5f96776a RS |
1037 | if (! (NILP (tem) |
1038 | || (CONSP (tem) | |
1039 | && (SYMBOLP (XCONS (tem)->car) | |
1040 | || CONSP (XCONS (tem)->car))))) | |
82da7701 JB |
1041 | error ("Invalid condition handler", tem); |
1042 | } | |
db9f0278 JB |
1043 | |
1044 | c.tag = Qnil; | |
1045 | c.val = Qnil; | |
1046 | c.backlist = backtrace_list; | |
1047 | c.handlerlist = handlerlist; | |
1048 | c.lisp_eval_depth = lisp_eval_depth; | |
1049 | c.pdlcount = specpdl_ptr - specpdl; | |
1050 | c.poll_suppress_count = poll_suppress_count; | |
1051 | c.gcpro = gcprolist; | |
1052 | if (_setjmp (c.jmp)) | |
1053 | { | |
265a9e55 | 1054 | if (!NILP (h.var)) |
9d58218c RS |
1055 | specbind (h.var, c.val); |
1056 | val = Fprogn (Fcdr (h.chosen_clause)); | |
82da7701 JB |
1057 | |
1058 | /* Note that this just undoes the binding of h.var; whoever | |
1059 | longjumped to us unwound the stack to c.pdlcount before | |
1060 | throwing. */ | |
db9f0278 JB |
1061 | unbind_to (c.pdlcount, Qnil); |
1062 | return val; | |
1063 | } | |
1064 | c.next = catchlist; | |
1065 | catchlist = &c; | |
db9f0278 | 1066 | |
82da7701 JB |
1067 | h.var = var; |
1068 | h.handler = handlers; | |
db9f0278 | 1069 | h.next = handlerlist; |
db9f0278 JB |
1070 | h.tag = &c; |
1071 | handlerlist = &h; | |
1072 | ||
82da7701 | 1073 | val = Feval (bodyform); |
db9f0278 JB |
1074 | catchlist = c.next; |
1075 | handlerlist = h.next; | |
1076 | return val; | |
1077 | } | |
1078 | ||
1079 | Lisp_Object | |
1080 | internal_condition_case (bfun, handlers, hfun) | |
1081 | Lisp_Object (*bfun) (); | |
1082 | Lisp_Object handlers; | |
1083 | Lisp_Object (*hfun) (); | |
1084 | { | |
1085 | Lisp_Object val; | |
1086 | struct catchtag c; | |
1087 | struct handler h; | |
1088 | ||
01591d17 RS |
1089 | /* Since Fsignal resets this to 0, it had better be 0 now |
1090 | or else we have a potential bug. */ | |
1091 | if (interrupt_input_blocked != 0) | |
1092 | abort (); | |
1093 | ||
db9f0278 JB |
1094 | c.tag = Qnil; |
1095 | c.val = Qnil; | |
1096 | c.backlist = backtrace_list; | |
1097 | c.handlerlist = handlerlist; | |
1098 | c.lisp_eval_depth = lisp_eval_depth; | |
1099 | c.pdlcount = specpdl_ptr - specpdl; | |
1100 | c.poll_suppress_count = poll_suppress_count; | |
1101 | c.gcpro = gcprolist; | |
1102 | if (_setjmp (c.jmp)) | |
1103 | { | |
9d58218c | 1104 | return (*hfun) (c.val); |
db9f0278 JB |
1105 | } |
1106 | c.next = catchlist; | |
1107 | catchlist = &c; | |
1108 | h.handler = handlers; | |
1109 | h.var = Qnil; | |
db9f0278 JB |
1110 | h.next = handlerlist; |
1111 | h.tag = &c; | |
1112 | handlerlist = &h; | |
1113 | ||
1114 | val = (*bfun) (); | |
1115 | catchlist = c.next; | |
1116 | handlerlist = h.next; | |
1117 | return val; | |
1118 | } | |
1119 | ||
d227775c RS |
1120 | Lisp_Object |
1121 | internal_condition_case_1 (bfun, arg, handlers, hfun) | |
1122 | Lisp_Object (*bfun) (); | |
1123 | Lisp_Object arg; | |
1124 | Lisp_Object handlers; | |
1125 | Lisp_Object (*hfun) (); | |
1126 | { | |
1127 | Lisp_Object val; | |
1128 | struct catchtag c; | |
1129 | struct handler h; | |
1130 | ||
1131 | c.tag = Qnil; | |
1132 | c.val = Qnil; | |
1133 | c.backlist = backtrace_list; | |
1134 | c.handlerlist = handlerlist; | |
1135 | c.lisp_eval_depth = lisp_eval_depth; | |
1136 | c.pdlcount = specpdl_ptr - specpdl; | |
1137 | c.poll_suppress_count = poll_suppress_count; | |
1138 | c.gcpro = gcprolist; | |
1139 | if (_setjmp (c.jmp)) | |
1140 | { | |
9d58218c | 1141 | return (*hfun) (c.val); |
d227775c RS |
1142 | } |
1143 | c.next = catchlist; | |
1144 | catchlist = &c; | |
1145 | h.handler = handlers; | |
1146 | h.var = Qnil; | |
1147 | h.next = handlerlist; | |
1148 | h.tag = &c; | |
1149 | handlerlist = &h; | |
1150 | ||
1151 | val = (*bfun) (arg); | |
1152 | catchlist = c.next; | |
1153 | handlerlist = h.next; | |
1154 | return val; | |
1155 | } | |
1156 | \f | |
db9f0278 JB |
1157 | static Lisp_Object find_handler_clause (); |
1158 | ||
1159 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
4200e719 | 1160 | "Signal an error. Args are ERROR-SYMBOL and associated DATA.\n\ |
db9f0278 | 1161 | This function does not return.\n\n\ |
4200e719 | 1162 | An error symbol is a symbol with an `error-conditions' property\n\ |
db9f0278 JB |
1163 | that is a list of condition names.\n\ |
1164 | A handler for any of those names will get to handle this signal.\n\ | |
1165 | The symbol `error' should normally be one of them.\n\ | |
1166 | \n\ | |
1167 | DATA should be a list. Its elements are printed as part of the error message.\n\ | |
1168 | If the signal is handled, DATA is made available to the handler.\n\ | |
1169 | See also the function `condition-case'.") | |
4200e719 RS |
1170 | (error_symbol, data) |
1171 | Lisp_Object error_symbol, data; | |
db9f0278 JB |
1172 | { |
1173 | register struct handler *allhandlers = handlerlist; | |
1174 | Lisp_Object conditions; | |
1175 | extern int gc_in_progress; | |
1176 | extern int waiting_for_input; | |
1177 | Lisp_Object debugger_value; | |
1178 | ||
1179 | quit_error_check (); | |
1180 | immediate_quit = 0; | |
1181 | if (gc_in_progress || waiting_for_input) | |
1182 | abort (); | |
1183 | ||
e5d77022 | 1184 | #ifdef HAVE_X_WINDOWS |
db9f0278 | 1185 | TOTALLY_UNBLOCK_INPUT; |
e5d77022 | 1186 | #endif |
db9f0278 | 1187 | |
4200e719 | 1188 | conditions = Fget (error_symbol, Qerror_conditions); |
db9f0278 JB |
1189 | |
1190 | for (; handlerlist; handlerlist = handlerlist->next) | |
1191 | { | |
1192 | register Lisp_Object clause; | |
1193 | clause = find_handler_clause (handlerlist->handler, conditions, | |
4200e719 | 1194 | error_symbol, data, &debugger_value); |
db9f0278 JB |
1195 | |
1196 | #if 0 /* Most callers are not prepared to handle gc if this returns. | |
1197 | So, since this feature is not very useful, take it out. */ | |
1198 | /* If have called debugger and user wants to continue, | |
1199 | just return nil. */ | |
1200 | if (EQ (clause, Qlambda)) | |
1201 | return debugger_value; | |
1202 | #else | |
1203 | if (EQ (clause, Qlambda)) | |
82da7701 JB |
1204 | { |
1205 | /* We can't return values to code which signalled an error, but we | |
1206 | can continue code which has signalled a quit. */ | |
4200e719 | 1207 | if (EQ (error_symbol, Qquit)) |
82da7701 JB |
1208 | return Qnil; |
1209 | else | |
d3e6f8be | 1210 | error ("Cannot return from the debugger in an error"); |
82da7701 | 1211 | } |
db9f0278 JB |
1212 | #endif |
1213 | ||
265a9e55 | 1214 | if (!NILP (clause)) |
db9f0278 | 1215 | { |
9d58218c | 1216 | Lisp_Object unwind_data; |
db9f0278 | 1217 | struct handler *h = handlerlist; |
9d58218c | 1218 | |
db9f0278 | 1219 | handlerlist = allhandlers; |
dff36a42 | 1220 | if (EQ (data, memory_signal_data)) |
9d58218c RS |
1221 | unwind_data = memory_signal_data; |
1222 | else | |
1223 | unwind_data = Fcons (error_symbol, data); | |
1224 | h->chosen_clause = clause; | |
1225 | unwind_to_catch (h->tag, unwind_data); | |
db9f0278 JB |
1226 | } |
1227 | } | |
1228 | ||
1229 | handlerlist = allhandlers; | |
1230 | /* If no handler is present now, try to run the debugger, | |
1231 | and if that fails, throw to top level. */ | |
4200e719 | 1232 | find_handler_clause (Qerror, conditions, error_symbol, data, &debugger_value); |
db9f0278 JB |
1233 | Fthrow (Qtop_level, Qt); |
1234 | } | |
1235 | ||
128c0f66 RM |
1236 | /* Return nonzero iff LIST is a non-nil atom or |
1237 | a list containing one of CONDITIONS. */ | |
1238 | ||
1239 | static int | |
1240 | wants_debugger (list, conditions) | |
1241 | Lisp_Object list, conditions; | |
1242 | { | |
4de86b16 | 1243 | if (NILP (list)) |
128c0f66 RM |
1244 | return 0; |
1245 | if (! CONSP (list)) | |
1246 | return 1; | |
1247 | ||
ab67260b | 1248 | while (CONSP (conditions)) |
128c0f66 | 1249 | { |
ab67260b RS |
1250 | Lisp_Object this, tail; |
1251 | this = XCONS (conditions)->car; | |
1252 | for (tail = list; CONSP (tail); tail = XCONS (tail)->cdr) | |
1253 | if (EQ (XCONS (tail)->car, this)) | |
128c0f66 | 1254 | return 1; |
128c0f66 RM |
1255 | conditions = XCONS (conditions)->cdr; |
1256 | } | |
ab67260b | 1257 | return 0; |
128c0f66 RM |
1258 | } |
1259 | ||
1260 | /* Value of Qlambda means we have called debugger and user has continued. | |
1261 | Store value returned from debugger into *DEBUGGER_VALUE_PTR. */ | |
db9f0278 JB |
1262 | |
1263 | static Lisp_Object | |
1264 | find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr) | |
1265 | Lisp_Object handlers, conditions, sig, data; | |
1266 | Lisp_Object *debugger_value_ptr; | |
1267 | { | |
1268 | register Lisp_Object h; | |
1269 | register Lisp_Object tem; | |
db9f0278 JB |
1270 | |
1271 | if (EQ (handlers, Qt)) /* t is used by handlers for all conditions, set up by C code. */ | |
1272 | return Qt; | |
1273 | if (EQ (handlers, Qerror)) /* error is used similarly, but means display a backtrace too */ | |
1274 | { | |
128c0f66 | 1275 | if (wants_debugger (Vstack_trace_on_error, conditions)) |
db9f0278 | 1276 | internal_with_output_to_temp_buffer ("*Backtrace*", Fbacktrace, Qnil); |
ba410f40 JB |
1277 | if ((EQ (sig, Qquit) |
1278 | ? debug_on_quit | |
1279 | : wants_debugger (Vdebug_on_error, conditions)) | |
1280 | && when_entered_debugger < num_nonmacro_input_chars) | |
db9f0278 JB |
1281 | { |
1282 | int count = specpdl_ptr - specpdl; | |
1283 | specbind (Qdebug_on_error, Qnil); | |
1284 | *debugger_value_ptr = | |
1285 | call_debugger (Fcons (Qerror, | |
1286 | Fcons (Fcons (sig, data), | |
1287 | Qnil))); | |
1288 | return unbind_to (count, Qlambda); | |
1289 | } | |
1290 | return Qt; | |
1291 | } | |
1292 | for (h = handlers; CONSP (h); h = Fcdr (h)) | |
1293 | { | |
5f96776a RS |
1294 | Lisp_Object handler, condit; |
1295 | ||
1296 | handler = Fcar (h); | |
1297 | if (!CONSP (handler)) | |
db9f0278 | 1298 | continue; |
5f96776a RS |
1299 | condit = Fcar (handler); |
1300 | /* Handle a single condition name in handler HANDLER. */ | |
1301 | if (SYMBOLP (condit)) | |
1302 | { | |
1303 | tem = Fmemq (Fcar (handler), conditions); | |
1304 | if (!NILP (tem)) | |
1305 | return handler; | |
1306 | } | |
1307 | /* Handle a list of condition names in handler HANDLER. */ | |
1308 | else if (CONSP (condit)) | |
1309 | { | |
1310 | while (CONSP (condit)) | |
1311 | { | |
1312 | tem = Fmemq (Fcar (condit), conditions); | |
1313 | if (!NILP (tem)) | |
1314 | return handler; | |
1315 | condit = XCONS (condit)->cdr; | |
1316 | } | |
1317 | } | |
db9f0278 JB |
1318 | } |
1319 | return Qnil; | |
1320 | } | |
1321 | ||
1322 | /* dump an error message; called like printf */ | |
1323 | ||
1324 | /* VARARGS 1 */ | |
1325 | void | |
1326 | error (m, a1, a2, a3) | |
1327 | char *m; | |
9125da08 | 1328 | char *a1, *a2, *a3; |
db9f0278 JB |
1329 | { |
1330 | char buf[200]; | |
9125da08 RS |
1331 | int size = 200; |
1332 | int mlen; | |
1333 | char *buffer = buf; | |
1334 | char *args[3]; | |
1335 | int allocated = 0; | |
1336 | Lisp_Object string; | |
1337 | ||
1338 | args[0] = a1; | |
1339 | args[1] = a2; | |
1340 | args[2] = a3; | |
1341 | ||
1342 | mlen = strlen (m); | |
db9f0278 JB |
1343 | |
1344 | while (1) | |
9125da08 RS |
1345 | { |
1346 | int used = doprnt (buf, size, m, m + mlen, 3, args); | |
1347 | if (used < size) | |
1348 | break; | |
1349 | size *= 2; | |
1350 | if (allocated) | |
1351 | buffer = (char *) xrealloc (buffer, size); | |
5ece1728 RS |
1352 | else |
1353 | { | |
1354 | buffer = (char *) xmalloc (size); | |
1355 | allocated = 1; | |
1356 | } | |
9125da08 RS |
1357 | } |
1358 | ||
1359 | string = build_string (buf); | |
1360 | if (allocated) | |
1361 | free (buffer); | |
1362 | ||
1363 | Fsignal (Qerror, Fcons (string, Qnil)); | |
db9f0278 JB |
1364 | } |
1365 | \f | |
1366 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 1, 0, | |
1367 | "T if FUNCTION makes provisions for interactive calling.\n\ | |
1368 | This means it contains a description for how to read arguments to give it.\n\ | |
1369 | The value is nil for an invalid function or a symbol with no function\n\ | |
1370 | definition.\n\ | |
1371 | \n\ | |
1372 | Interactively callable functions include strings and vectors (treated\n\ | |
1373 | as keyboard macros), lambda-expressions that contain a top-level call\n\ | |
1374 | to `interactive', autoload definitions made by `autoload' with non-nil\n\ | |
1375 | fourth argument, and some of the built-in functions of Lisp.\n\ | |
1376 | \n\ | |
1377 | Also, a symbol satisfies `commandp' if its function definition does so.") | |
1378 | (function) | |
1379 | Lisp_Object function; | |
1380 | { | |
1381 | register Lisp_Object fun; | |
1382 | register Lisp_Object funcar; | |
1383 | register Lisp_Object tem; | |
1384 | register int i = 0; | |
1385 | ||
1386 | fun = function; | |
1387 | ||
ffd56f97 JB |
1388 | fun = indirect_function (fun); |
1389 | if (EQ (fun, Qunbound)) | |
1390 | return Qnil; | |
db9f0278 JB |
1391 | |
1392 | /* Emacs primitives are interactive if their DEFUN specifies an | |
1393 | interactive spec. */ | |
90165123 | 1394 | if (SUBRP (fun)) |
db9f0278 JB |
1395 | { |
1396 | if (XSUBR (fun)->prompt) | |
1397 | return Qt; | |
1398 | else | |
1399 | return Qnil; | |
1400 | } | |
1401 | ||
1402 | /* Bytecode objects are interactive if they are long enough to | |
1403 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1404 | where the interactive spec is stored. */ | |
90165123 | 1405 | else if (COMPILEDP (fun)) |
f9b4aacf | 1406 | return ((XVECTOR (fun)->size & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE |
db9f0278 JB |
1407 | ? Qt : Qnil); |
1408 | ||
1409 | /* Strings and vectors are keyboard macros. */ | |
90165123 | 1410 | if (STRINGP (fun) || VECTORP (fun)) |
db9f0278 JB |
1411 | return Qt; |
1412 | ||
1413 | /* Lists may represent commands. */ | |
1414 | if (!CONSP (fun)) | |
1415 | return Qnil; | |
1416 | funcar = Fcar (fun); | |
90165123 | 1417 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
1418 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
1419 | if (EQ (funcar, Qlambda)) | |
1420 | return Fassq (Qinteractive, Fcdr (Fcdr (fun))); | |
1421 | if (EQ (funcar, Qmocklisp)) | |
1422 | return Qt; /* All mocklisp functions can be called interactively */ | |
1423 | if (EQ (funcar, Qautoload)) | |
1424 | return Fcar (Fcdr (Fcdr (Fcdr (fun)))); | |
1425 | else | |
1426 | return Qnil; | |
1427 | } | |
1428 | ||
1429 | /* ARGSUSED */ | |
1430 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, | |
1431 | "Define FUNCTION to autoload from FILE.\n\ | |
1432 | FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\ | |
1433 | Third arg DOCSTRING is documentation for the function.\n\ | |
1434 | Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\ | |
ee9ee63c JB |
1435 | Fifth arg TYPE indicates the type of the object:\n\ |
1436 | nil or omitted says FUNCTION is a function,\n\ | |
1437 | `keymap' says FUNCTION is really a keymap, and\n\ | |
1438 | `macro' or t says FUNCTION is really a macro.\n\ | |
db9f0278 JB |
1439 | Third through fifth args give info about the real definition.\n\ |
1440 | They default to nil.\n\ | |
1441 | If FUNCTION is already defined other than as an autoload,\n\ | |
1442 | this does nothing and returns nil.") | |
ee9ee63c JB |
1443 | (function, file, docstring, interactive, type) |
1444 | Lisp_Object function, file, docstring, interactive, type; | |
db9f0278 JB |
1445 | { |
1446 | #ifdef NO_ARG_ARRAY | |
1447 | Lisp_Object args[4]; | |
1448 | #endif | |
1449 | ||
1450 | CHECK_SYMBOL (function, 0); | |
1451 | CHECK_STRING (file, 1); | |
1452 | ||
1453 | /* If function is defined and not as an autoload, don't override */ | |
1454 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
90165123 | 1455 | && !(CONSP (XSYMBOL (function)->function) |
db9f0278 JB |
1456 | && EQ (XCONS (XSYMBOL (function)->function)->car, Qautoload))) |
1457 | return Qnil; | |
1458 | ||
1459 | #ifdef NO_ARG_ARRAY | |
1460 | args[0] = file; | |
1461 | args[1] = docstring; | |
1462 | args[2] = interactive; | |
ee9ee63c | 1463 | args[3] = type; |
db9f0278 JB |
1464 | |
1465 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); | |
1466 | #else /* NO_ARG_ARRAY */ | |
1467 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); | |
1468 | #endif /* not NO_ARG_ARRAY */ | |
1469 | } | |
1470 | ||
1471 | Lisp_Object | |
1472 | un_autoload (oldqueue) | |
1473 | Lisp_Object oldqueue; | |
1474 | { | |
1475 | register Lisp_Object queue, first, second; | |
1476 | ||
1477 | /* Queue to unwind is current value of Vautoload_queue. | |
1478 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1479 | queue = Vautoload_queue; | |
1480 | Vautoload_queue = oldqueue; | |
1481 | while (CONSP (queue)) | |
1482 | { | |
1483 | first = Fcar (queue); | |
1484 | second = Fcdr (first); | |
1485 | first = Fcar (first); | |
1486 | if (EQ (second, Qnil)) | |
1487 | Vfeatures = first; | |
1488 | else | |
1489 | Ffset (first, second); | |
1490 | queue = Fcdr (queue); | |
1491 | } | |
1492 | return Qnil; | |
1493 | } | |
1494 | ||
1495 | do_autoload (fundef, funname) | |
1496 | Lisp_Object fundef, funname; | |
1497 | { | |
1498 | int count = specpdl_ptr - specpdl; | |
2a49b6e5 | 1499 | Lisp_Object fun, val, queue, first, second; |
db9f0278 JB |
1500 | |
1501 | fun = funname; | |
1502 | CHECK_SYMBOL (funname, 0); | |
1503 | ||
1504 | /* Value saved here is to be restored into Vautoload_queue */ | |
1505 | record_unwind_protect (un_autoload, Vautoload_queue); | |
1506 | Vautoload_queue = Qt; | |
1507 | Fload (Fcar (Fcdr (fundef)), Qnil, noninteractive ? Qt : Qnil, Qnil); | |
2a49b6e5 RS |
1508 | |
1509 | /* Save the old autoloads, in case we ever do an unload. */ | |
1510 | queue = Vautoload_queue; | |
1511 | while (CONSP (queue)) | |
1512 | { | |
1513 | first = Fcar (queue); | |
1514 | second = Fcdr (first); | |
1515 | first = Fcar (first); | |
5739ce6b ER |
1516 | |
1517 | /* Note: This test is subtle. The cdr of an autoload-queue entry | |
1518 | may be an atom if the autoload entry was generated by a defalias | |
1519 | or fset. */ | |
1520 | if (CONSP (second)) | |
03e267c2 | 1521 | Fput (first, Qautoload, (Fcdr (second))); |
5739ce6b | 1522 | |
2a49b6e5 RS |
1523 | queue = Fcdr (queue); |
1524 | } | |
1525 | ||
db9f0278 JB |
1526 | /* Once loading finishes, don't undo it. */ |
1527 | Vautoload_queue = Qt; | |
1528 | unbind_to (count, Qnil); | |
1529 | ||
ffd56f97 JB |
1530 | fun = Findirect_function (fun); |
1531 | ||
76c2b0cc | 1532 | if (!NILP (Fequal (fun, fundef))) |
db9f0278 JB |
1533 | error ("Autoloading failed to define function %s", |
1534 | XSYMBOL (funname)->name->data); | |
1535 | } | |
1536 | \f | |
1537 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
1538 | "Evaluate FORM and return its value.") | |
1539 | (form) | |
1540 | Lisp_Object form; | |
1541 | { | |
1542 | Lisp_Object fun, val, original_fun, original_args; | |
1543 | Lisp_Object funcar; | |
1544 | struct backtrace backtrace; | |
1545 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1546 | ||
90165123 | 1547 | if (SYMBOLP (form)) |
db9f0278 JB |
1548 | { |
1549 | if (EQ (Vmocklisp_arguments, Qt)) | |
1550 | return Fsymbol_value (form); | |
1551 | val = Fsymbol_value (form); | |
265a9e55 | 1552 | if (NILP (val)) |
a631e24c | 1553 | XSETFASTINT (val, 0); |
db9f0278 | 1554 | else if (EQ (val, Qt)) |
a631e24c | 1555 | XSETFASTINT (val, 1); |
db9f0278 JB |
1556 | return val; |
1557 | } | |
1558 | if (!CONSP (form)) | |
1559 | return form; | |
1560 | ||
1561 | QUIT; | |
1562 | if (consing_since_gc > gc_cons_threshold) | |
1563 | { | |
1564 | GCPRO1 (form); | |
1565 | Fgarbage_collect (); | |
1566 | UNGCPRO; | |
1567 | } | |
1568 | ||
1569 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1570 | { | |
1571 | if (max_lisp_eval_depth < 100) | |
1572 | max_lisp_eval_depth = 100; | |
1573 | if (lisp_eval_depth > max_lisp_eval_depth) | |
1574 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
1575 | } | |
1576 | ||
1577 | original_fun = Fcar (form); | |
1578 | original_args = Fcdr (form); | |
1579 | ||
1580 | backtrace.next = backtrace_list; | |
1581 | backtrace_list = &backtrace; | |
1582 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
1583 | backtrace.args = &original_args; | |
1584 | backtrace.nargs = UNEVALLED; | |
1585 | backtrace.evalargs = 1; | |
1586 | backtrace.debug_on_exit = 0; | |
1587 | ||
1588 | if (debug_on_next_call) | |
1589 | do_debug_on_call (Qt); | |
1590 | ||
1591 | /* At this point, only original_fun and original_args | |
1592 | have values that will be used below */ | |
1593 | retry: | |
ffd56f97 | 1594 | fun = Findirect_function (original_fun); |
db9f0278 | 1595 | |
90165123 | 1596 | if (SUBRP (fun)) |
db9f0278 JB |
1597 | { |
1598 | Lisp_Object numargs; | |
1599 | Lisp_Object argvals[7]; | |
1600 | Lisp_Object args_left; | |
1601 | register int i, maxargs; | |
1602 | ||
1603 | args_left = original_args; | |
1604 | numargs = Flength (args_left); | |
1605 | ||
1606 | if (XINT (numargs) < XSUBR (fun)->min_args || | |
1607 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
1608 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
1609 | ||
1610 | if (XSUBR (fun)->max_args == UNEVALLED) | |
1611 | { | |
1612 | backtrace.evalargs = 0; | |
1613 | val = (*XSUBR (fun)->function) (args_left); | |
1614 | goto done; | |
1615 | } | |
1616 | ||
1617 | if (XSUBR (fun)->max_args == MANY) | |
1618 | { | |
1619 | /* Pass a vector of evaluated arguments */ | |
1620 | Lisp_Object *vals; | |
1621 | register int argnum = 0; | |
1622 | ||
1623 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
1624 | ||
1625 | GCPRO3 (args_left, fun, fun); | |
1626 | gcpro3.var = vals; | |
1627 | gcpro3.nvars = 0; | |
1628 | ||
265a9e55 | 1629 | while (!NILP (args_left)) |
db9f0278 JB |
1630 | { |
1631 | vals[argnum++] = Feval (Fcar (args_left)); | |
1632 | args_left = Fcdr (args_left); | |
1633 | gcpro3.nvars = argnum; | |
1634 | } | |
db9f0278 JB |
1635 | |
1636 | backtrace.args = vals; | |
1637 | backtrace.nargs = XINT (numargs); | |
1638 | ||
1639 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 1640 | UNGCPRO; |
db9f0278 JB |
1641 | goto done; |
1642 | } | |
1643 | ||
1644 | GCPRO3 (args_left, fun, fun); | |
1645 | gcpro3.var = argvals; | |
1646 | gcpro3.nvars = 0; | |
1647 | ||
1648 | maxargs = XSUBR (fun)->max_args; | |
1649 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
1650 | { | |
1651 | argvals[i] = Feval (Fcar (args_left)); | |
1652 | gcpro3.nvars = ++i; | |
1653 | } | |
1654 | ||
1655 | UNGCPRO; | |
1656 | ||
1657 | backtrace.args = argvals; | |
1658 | backtrace.nargs = XINT (numargs); | |
1659 | ||
1660 | switch (i) | |
1661 | { | |
1662 | case 0: | |
1663 | val = (*XSUBR (fun)->function) (); | |
1664 | goto done; | |
1665 | case 1: | |
1666 | val = (*XSUBR (fun)->function) (argvals[0]); | |
1667 | goto done; | |
1668 | case 2: | |
1669 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
1670 | goto done; | |
1671 | case 3: | |
1672 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1673 | argvals[2]); | |
1674 | goto done; | |
1675 | case 4: | |
1676 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1677 | argvals[2], argvals[3]); | |
1678 | goto done; | |
1679 | case 5: | |
1680 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1681 | argvals[3], argvals[4]); | |
1682 | goto done; | |
1683 | case 6: | |
1684 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1685 | argvals[3], argvals[4], argvals[5]); | |
1686 | goto done; | |
15c65264 RS |
1687 | case 7: |
1688 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1689 | argvals[3], argvals[4], argvals[5], | |
1690 | argvals[6]); | |
1691 | goto done; | |
db9f0278 JB |
1692 | |
1693 | default: | |
08564963 JB |
1694 | /* Someone has created a subr that takes more arguments than |
1695 | is supported by this code. We need to either rewrite the | |
1696 | subr to use a different argument protocol, or add more | |
1697 | cases to this switch. */ | |
1698 | abort (); | |
db9f0278 JB |
1699 | } |
1700 | } | |
90165123 | 1701 | if (COMPILEDP (fun)) |
db9f0278 JB |
1702 | val = apply_lambda (fun, original_args, 1); |
1703 | else | |
1704 | { | |
1705 | if (!CONSP (fun)) | |
1706 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1707 | funcar = Fcar (fun); | |
90165123 | 1708 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
1709 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
1710 | if (EQ (funcar, Qautoload)) | |
1711 | { | |
1712 | do_autoload (fun, original_fun); | |
1713 | goto retry; | |
1714 | } | |
1715 | if (EQ (funcar, Qmacro)) | |
1716 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
1717 | else if (EQ (funcar, Qlambda)) | |
1718 | val = apply_lambda (fun, original_args, 1); | |
1719 | else if (EQ (funcar, Qmocklisp)) | |
1720 | val = ml_apply (fun, original_args); | |
1721 | else | |
1722 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1723 | } | |
1724 | done: | |
1725 | if (!EQ (Vmocklisp_arguments, Qt)) | |
1726 | { | |
265a9e55 | 1727 | if (NILP (val)) |
a631e24c | 1728 | XSETFASTINT (val, 0); |
db9f0278 | 1729 | else if (EQ (val, Qt)) |
a631e24c | 1730 | XSETFASTINT (val, 1); |
db9f0278 JB |
1731 | } |
1732 | lisp_eval_depth--; | |
1733 | if (backtrace.debug_on_exit) | |
1734 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
1735 | backtrace_list = backtrace.next; | |
1736 | return val; | |
1737 | } | |
1738 | \f | |
1739 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
1740 | "Call FUNCTION with our remaining args, using our last arg as list of args.\n\ | |
fd7fe9a1 | 1741 | Then return the value FUNCTION returns.\n\ |
db9f0278 JB |
1742 | Thus, (apply '+ 1 2 '(3 4)) returns 10.") |
1743 | (nargs, args) | |
1744 | int nargs; | |
1745 | Lisp_Object *args; | |
1746 | { | |
1747 | register int i, numargs; | |
1748 | register Lisp_Object spread_arg; | |
1749 | register Lisp_Object *funcall_args; | |
db9f0278 | 1750 | Lisp_Object fun; |
a6e3fa71 | 1751 | struct gcpro gcpro1; |
db9f0278 JB |
1752 | |
1753 | fun = args [0]; | |
1754 | funcall_args = 0; | |
1755 | spread_arg = args [nargs - 1]; | |
1756 | CHECK_LIST (spread_arg, nargs); | |
1757 | ||
1758 | numargs = XINT (Flength (spread_arg)); | |
1759 | ||
1760 | if (numargs == 0) | |
1761 | return Ffuncall (nargs - 1, args); | |
1762 | else if (numargs == 1) | |
1763 | { | |
1764 | args [nargs - 1] = XCONS (spread_arg)->car; | |
1765 | return Ffuncall (nargs, args); | |
1766 | } | |
1767 | ||
a6e3fa71 | 1768 | numargs += nargs - 2; |
db9f0278 | 1769 | |
ffd56f97 JB |
1770 | fun = indirect_function (fun); |
1771 | if (EQ (fun, Qunbound)) | |
db9f0278 | 1772 | { |
ffd56f97 JB |
1773 | /* Let funcall get the error */ |
1774 | fun = args[0]; | |
1775 | goto funcall; | |
db9f0278 JB |
1776 | } |
1777 | ||
90165123 | 1778 | if (SUBRP (fun)) |
db9f0278 JB |
1779 | { |
1780 | if (numargs < XSUBR (fun)->min_args | |
1781 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
1782 | goto funcall; /* Let funcall get the error */ | |
1783 | else if (XSUBR (fun)->max_args > numargs) | |
1784 | { | |
1785 | /* Avoid making funcall cons up a yet another new vector of arguments | |
1786 | by explicitly supplying nil's for optional values */ | |
1787 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
1788 | * sizeof (Lisp_Object)); | |
1789 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
1790 | funcall_args[++i] = Qnil; | |
a6e3fa71 JB |
1791 | GCPRO1 (*funcall_args); |
1792 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
1793 | } |
1794 | } | |
1795 | funcall: | |
1796 | /* We add 1 to numargs because funcall_args includes the | |
1797 | function itself as well as its arguments. */ | |
1798 | if (!funcall_args) | |
a6e3fa71 JB |
1799 | { |
1800 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
1801 | * sizeof (Lisp_Object)); | |
1802 | GCPRO1 (*funcall_args); | |
1803 | gcpro1.nvars = 1 + numargs; | |
1804 | } | |
1805 | ||
db9f0278 JB |
1806 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
1807 | /* Spread the last arg we got. Its first element goes in | |
1808 | the slot that it used to occupy, hence this value of I. */ | |
1809 | i = nargs - 1; | |
265a9e55 | 1810 | while (!NILP (spread_arg)) |
db9f0278 JB |
1811 | { |
1812 | funcall_args [i++] = XCONS (spread_arg)->car; | |
1813 | spread_arg = XCONS (spread_arg)->cdr; | |
1814 | } | |
a6e3fa71 JB |
1815 | |
1816 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
1817 | } |
1818 | \f | |
ff936e53 SM |
1819 | /* Run hook variables in various ways. */ |
1820 | ||
1821 | enum run_hooks_condition {to_completion, until_success, until_failure}; | |
1822 | ||
1823 | DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 1, MANY, 0, | |
1824 | "Run each hook in HOOKS. Major mode functions use this.\n\ | |
1825 | Each argument should be a symbol, a hook variable.\n\ | |
1826 | These symbols are processed in the order specified.\n\ | |
1827 | If a hook symbol has a non-nil value, that value may be a function\n\ | |
1828 | or a list of functions to be called to run the hook.\n\ | |
1829 | If the value is a function, it is called with no arguments.\n\ | |
1830 | If it is a list, the elements are called, in order, with no arguments.\n\ | |
1831 | \n\ | |
1832 | To make a hook variable buffer-local, use `make-local-hook',\n\ | |
1833 | not `make-local-variable'.") | |
1834 | (nargs, args) | |
1835 | int nargs; | |
1836 | Lisp_Object *args; | |
1837 | { | |
1838 | Lisp_Object hook[1]; | |
1839 | register int i; | |
1840 | ||
1841 | for (i = 0; i < nargs; i++) | |
1842 | { | |
1843 | hook[0] = args[i]; | |
1844 | run_hook_with_args (1, hook, to_completion); | |
1845 | } | |
1846 | ||
1847 | return Qnil; | |
1848 | } | |
1849 | ||
1850 | DEFUN ("run-hook-with-args", | |
1851 | Frun_hook_with_args, Srun_hook_with_args, 1, MANY, 0, | |
b0b667cb KH |
1852 | "Run HOOK with the specified arguments ARGS.\n\ |
1853 | HOOK should be a symbol, a hook variable. If HOOK has a non-nil\n\ | |
1854 | value, that value may be a function or a list of functions to be\n\ | |
1855 | called to run the hook. If the value is a function, it is called with\n\ | |
1856 | the given arguments and its return value is returned. If it is a list\n\ | |
1857 | of functions, those functions are called, in order,\n\ | |
1858 | with the given arguments ARGS.\n\ | |
1859 | It is best not to depend on the value return by `run-hook-with-args',\n\ | |
1860 | as that may change.\n\ | |
1861 | \n\ | |
ff936e53 SM |
1862 | To make a hook variable buffer-local, use `make-local-hook',\n\ |
1863 | not `make-local-variable'.") | |
1864 | (nargs, args) | |
1865 | int nargs; | |
1866 | Lisp_Object *args; | |
1867 | { | |
1868 | return run_hook_with_args (nargs, args, to_completion); | |
1869 | } | |
1870 | ||
1871 | DEFUN ("run-hook-with-args-until-success", | |
1872 | Frun_hook_with_args_until_success, Srun_hook_with_args_until_success, | |
1873 | 1, MANY, 0, | |
1874 | "Run HOOK with the specified arguments ARGS.\n\ | |
1875 | HOOK should be a symbol, a hook variable. Its value should\n\ | |
1876 | be a list of functions. We call those functions, one by one,\n\ | |
1877 | passing arguments ARGS to each of them, until one of them\n\ | |
1878 | returns a non-nil value. Then we return that value.\n\ | |
1879 | If all the functions return nil, we return nil.\n\ | |
1880 | \n\ | |
1881 | To make a hook variable buffer-local, use `make-local-hook',\n\ | |
1882 | not `make-local-variable'.") | |
b0b667cb KH |
1883 | (nargs, args) |
1884 | int nargs; | |
1885 | Lisp_Object *args; | |
1886 | { | |
ff936e53 SM |
1887 | return run_hook_with_args (nargs, args, until_success); |
1888 | } | |
1889 | ||
1890 | DEFUN ("run-hook-with-args-until-failure", | |
1891 | Frun_hook_with_args_until_failure, Srun_hook_with_args_until_failure, | |
1892 | 1, MANY, 0, | |
1893 | "Run HOOK with the specified arguments ARGS.\n\ | |
1894 | HOOK should be a symbol, a hook variable. Its value should\n\ | |
1895 | be a list of functions. We call those functions, one by one,\n\ | |
1896 | passing arguments ARGS to each of them, until one of them\n\ | |
1897 | returns nil. Then we return nil.\n\ | |
1898 | If all the functions return non-nil, we return non-nil.\n\ | |
1899 | \n\ | |
1900 | To make a hook variable buffer-local, use `make-local-hook',\n\ | |
1901 | not `make-local-variable'.") | |
1902 | (nargs, args) | |
1903 | int nargs; | |
1904 | Lisp_Object *args; | |
1905 | { | |
1906 | return run_hook_with_args (nargs, args, until_failure); | |
1907 | } | |
1908 | ||
c933ea05 RS |
1909 | /* ARGS[0] should be a hook symbol. |
1910 | Call each of the functions in the hook value, passing each of them | |
1911 | as arguments all the rest of ARGS (all NARGS - 1 elements). | |
1912 | COND specifies a condition to test after each call | |
1913 | to decide whether to stop. | |
1914 | The caller (or its caller, etc) must gcpro all of ARGS, | |
1915 | except that it isn't necessary to gcpro ARGS[0]. */ | |
1916 | ||
ff936e53 SM |
1917 | Lisp_Object |
1918 | run_hook_with_args (nargs, args, cond) | |
1919 | int nargs; | |
1920 | Lisp_Object *args; | |
1921 | enum run_hooks_condition cond; | |
1922 | { | |
1923 | Lisp_Object sym, val, ret; | |
c933ea05 | 1924 | struct gcpro gcpro1, gcpro2; |
b0b667cb KH |
1925 | |
1926 | sym = args[0]; | |
aa681b51 | 1927 | val = find_symbol_value (sym); |
ff936e53 SM |
1928 | ret = (cond == until_failure ? Qt : Qnil); |
1929 | ||
b0b667cb | 1930 | if (EQ (val, Qunbound) || NILP (val)) |
ff936e53 | 1931 | return ret; |
b0b667cb KH |
1932 | else if (!CONSP (val) || EQ (XCONS (val)->car, Qlambda)) |
1933 | { | |
1934 | args[0] = val; | |
1935 | return Ffuncall (nargs, args); | |
1936 | } | |
1937 | else | |
1938 | { | |
cb9d21f8 RS |
1939 | GCPRO2 (sym, val); |
1940 | ||
ff936e53 SM |
1941 | for (; |
1942 | CONSP (val) && ((cond == to_completion) | |
1943 | || (cond == until_success ? NILP (ret) | |
1944 | : !NILP (ret))); | |
1945 | val = XCONS (val)->cdr) | |
b0b667cb KH |
1946 | { |
1947 | if (EQ (XCONS (val)->car, Qt)) | |
1948 | { | |
1949 | /* t indicates this hook has a local binding; | |
1950 | it means to run the global binding too. */ | |
1951 | Lisp_Object globals; | |
1952 | ||
ff936e53 SM |
1953 | for (globals = Fdefault_value (sym); |
1954 | CONSP (globals) && ((cond == to_completion) | |
1955 | || (cond == until_success ? NILP (ret) | |
1956 | : !NILP (ret))); | |
b0b667cb KH |
1957 | globals = XCONS (globals)->cdr) |
1958 | { | |
1959 | args[0] = XCONS (globals)->car; | |
ff936e53 | 1960 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
1961 | } |
1962 | } | |
1963 | else | |
1964 | { | |
1965 | args[0] = XCONS (val)->car; | |
ff936e53 | 1966 | ret = Ffuncall (nargs, args); |
b0b667cb KH |
1967 | } |
1968 | } | |
cb9d21f8 RS |
1969 | |
1970 | UNGCPRO; | |
ff936e53 | 1971 | return ret; |
b0b667cb KH |
1972 | } |
1973 | } | |
c933ea05 RS |
1974 | |
1975 | /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual | |
1976 | present value of that symbol. | |
1977 | Call each element of FUNLIST, | |
1978 | passing each of them the rest of ARGS. | |
1979 | The caller (or its caller, etc) must gcpro all of ARGS, | |
1980 | except that it isn't necessary to gcpro ARGS[0]. */ | |
1981 | ||
1982 | Lisp_Object | |
1983 | run_hook_list_with_args (funlist, nargs, args) | |
1984 | Lisp_Object funlist; | |
1985 | int nargs; | |
1986 | Lisp_Object *args; | |
1987 | { | |
1988 | Lisp_Object sym; | |
1989 | Lisp_Object val; | |
1990 | struct gcpro gcpro1, gcpro2; | |
1991 | ||
1992 | sym = args[0]; | |
1993 | GCPRO2 (sym, val); | |
1994 | ||
1995 | for (val = funlist; CONSP (val); val = XCONS (val)->cdr) | |
1996 | { | |
1997 | if (EQ (XCONS (val)->car, Qt)) | |
1998 | { | |
1999 | /* t indicates this hook has a local binding; | |
2000 | it means to run the global binding too. */ | |
2001 | Lisp_Object globals; | |
2002 | ||
2003 | for (globals = Fdefault_value (sym); | |
2004 | CONSP (globals); | |
2005 | globals = XCONS (globals)->cdr) | |
2006 | { | |
2007 | args[0] = XCONS (globals)->car; | |
2008 | Ffuncall (nargs, args); | |
2009 | } | |
2010 | } | |
2011 | else | |
2012 | { | |
2013 | args[0] = XCONS (val)->car; | |
2014 | Ffuncall (nargs, args); | |
2015 | } | |
2016 | } | |
2017 | UNGCPRO; | |
2018 | return Qnil; | |
2019 | } | |
ff936e53 | 2020 | \f |
db9f0278 JB |
2021 | /* Apply fn to arg */ |
2022 | Lisp_Object | |
2023 | apply1 (fn, arg) | |
2024 | Lisp_Object fn, arg; | |
2025 | { | |
a6e3fa71 JB |
2026 | struct gcpro gcpro1; |
2027 | ||
2028 | GCPRO1 (fn); | |
265a9e55 | 2029 | if (NILP (arg)) |
a6e3fa71 JB |
2030 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
2031 | gcpro1.nvars = 2; | |
db9f0278 JB |
2032 | #ifdef NO_ARG_ARRAY |
2033 | { | |
2034 | Lisp_Object args[2]; | |
2035 | args[0] = fn; | |
2036 | args[1] = arg; | |
a6e3fa71 JB |
2037 | gcpro1.var = args; |
2038 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 JB |
2039 | } |
2040 | #else /* not NO_ARG_ARRAY */ | |
a6e3fa71 | 2041 | RETURN_UNGCPRO (Fapply (2, &fn)); |
db9f0278 JB |
2042 | #endif /* not NO_ARG_ARRAY */ |
2043 | } | |
2044 | ||
2045 | /* Call function fn on no arguments */ | |
2046 | Lisp_Object | |
2047 | call0 (fn) | |
2048 | Lisp_Object fn; | |
2049 | { | |
a6e3fa71 JB |
2050 | struct gcpro gcpro1; |
2051 | ||
2052 | GCPRO1 (fn); | |
2053 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
2054 | } |
2055 | ||
15285f9f | 2056 | /* Call function fn with 1 argument arg1 */ |
db9f0278 JB |
2057 | /* ARGSUSED */ |
2058 | Lisp_Object | |
15285f9f RS |
2059 | call1 (fn, arg1) |
2060 | Lisp_Object fn, arg1; | |
db9f0278 | 2061 | { |
a6e3fa71 | 2062 | struct gcpro gcpro1; |
db9f0278 | 2063 | #ifdef NO_ARG_ARRAY |
a6e3fa71 JB |
2064 | Lisp_Object args[2]; |
2065 | ||
db9f0278 | 2066 | args[0] = fn; |
15285f9f | 2067 | args[1] = arg1; |
a6e3fa71 JB |
2068 | GCPRO1 (args[0]); |
2069 | gcpro1.nvars = 2; | |
2070 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 | 2071 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2072 | GCPRO1 (fn); |
2073 | gcpro1.nvars = 2; | |
2074 | RETURN_UNGCPRO (Ffuncall (2, &fn)); | |
db9f0278 JB |
2075 | #endif /* not NO_ARG_ARRAY */ |
2076 | } | |
2077 | ||
15285f9f | 2078 | /* Call function fn with 2 arguments arg1, arg2 */ |
db9f0278 JB |
2079 | /* ARGSUSED */ |
2080 | Lisp_Object | |
15285f9f RS |
2081 | call2 (fn, arg1, arg2) |
2082 | Lisp_Object fn, arg1, arg2; | |
db9f0278 | 2083 | { |
a6e3fa71 | 2084 | struct gcpro gcpro1; |
db9f0278 JB |
2085 | #ifdef NO_ARG_ARRAY |
2086 | Lisp_Object args[3]; | |
2087 | args[0] = fn; | |
15285f9f RS |
2088 | args[1] = arg1; |
2089 | args[2] = arg2; | |
a6e3fa71 JB |
2090 | GCPRO1 (args[0]); |
2091 | gcpro1.nvars = 3; | |
2092 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 | 2093 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2094 | GCPRO1 (fn); |
2095 | gcpro1.nvars = 3; | |
2096 | RETURN_UNGCPRO (Ffuncall (3, &fn)); | |
db9f0278 JB |
2097 | #endif /* not NO_ARG_ARRAY */ |
2098 | } | |
2099 | ||
15285f9f | 2100 | /* Call function fn with 3 arguments arg1, arg2, arg3 */ |
db9f0278 JB |
2101 | /* ARGSUSED */ |
2102 | Lisp_Object | |
15285f9f RS |
2103 | call3 (fn, arg1, arg2, arg3) |
2104 | Lisp_Object fn, arg1, arg2, arg3; | |
db9f0278 | 2105 | { |
a6e3fa71 | 2106 | struct gcpro gcpro1; |
db9f0278 JB |
2107 | #ifdef NO_ARG_ARRAY |
2108 | Lisp_Object args[4]; | |
2109 | args[0] = fn; | |
15285f9f RS |
2110 | args[1] = arg1; |
2111 | args[2] = arg2; | |
2112 | args[3] = arg3; | |
a6e3fa71 JB |
2113 | GCPRO1 (args[0]); |
2114 | gcpro1.nvars = 4; | |
2115 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 | 2116 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
2117 | GCPRO1 (fn); |
2118 | gcpro1.nvars = 4; | |
2119 | RETURN_UNGCPRO (Ffuncall (4, &fn)); | |
db9f0278 JB |
2120 | #endif /* not NO_ARG_ARRAY */ |
2121 | } | |
2122 | ||
15285f9f | 2123 | /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */ |
a5a44b91 JB |
2124 | /* ARGSUSED */ |
2125 | Lisp_Object | |
15285f9f RS |
2126 | call4 (fn, arg1, arg2, arg3, arg4) |
2127 | Lisp_Object fn, arg1, arg2, arg3, arg4; | |
a5a44b91 JB |
2128 | { |
2129 | struct gcpro gcpro1; | |
2130 | #ifdef NO_ARG_ARRAY | |
2131 | Lisp_Object args[5]; | |
2132 | args[0] = fn; | |
15285f9f RS |
2133 | args[1] = arg1; |
2134 | args[2] = arg2; | |
2135 | args[3] = arg3; | |
2136 | args[4] = arg4; | |
a5a44b91 JB |
2137 | GCPRO1 (args[0]); |
2138 | gcpro1.nvars = 5; | |
2139 | RETURN_UNGCPRO (Ffuncall (5, args)); | |
2140 | #else /* not NO_ARG_ARRAY */ | |
2141 | GCPRO1 (fn); | |
2142 | gcpro1.nvars = 5; | |
2143 | RETURN_UNGCPRO (Ffuncall (5, &fn)); | |
2144 | #endif /* not NO_ARG_ARRAY */ | |
2145 | } | |
2146 | ||
15285f9f RS |
2147 | /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */ |
2148 | /* ARGSUSED */ | |
2149 | Lisp_Object | |
2150 | call5 (fn, arg1, arg2, arg3, arg4, arg5) | |
2151 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5; | |
2152 | { | |
2153 | struct gcpro gcpro1; | |
2154 | #ifdef NO_ARG_ARRAY | |
2155 | Lisp_Object args[6]; | |
2156 | args[0] = fn; | |
2157 | args[1] = arg1; | |
2158 | args[2] = arg2; | |
2159 | args[3] = arg3; | |
2160 | args[4] = arg4; | |
2161 | args[5] = arg5; | |
2162 | GCPRO1 (args[0]); | |
2163 | gcpro1.nvars = 6; | |
2164 | RETURN_UNGCPRO (Ffuncall (6, args)); | |
2165 | #else /* not NO_ARG_ARRAY */ | |
2166 | GCPRO1 (fn); | |
2167 | gcpro1.nvars = 6; | |
2168 | RETURN_UNGCPRO (Ffuncall (6, &fn)); | |
2169 | #endif /* not NO_ARG_ARRAY */ | |
2170 | } | |
2171 | ||
2172 | /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */ | |
2173 | /* ARGSUSED */ | |
2174 | Lisp_Object | |
2175 | call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6) | |
2176 | Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6; | |
2177 | { | |
2178 | struct gcpro gcpro1; | |
2179 | #ifdef NO_ARG_ARRAY | |
2180 | Lisp_Object args[7]; | |
2181 | args[0] = fn; | |
2182 | args[1] = arg1; | |
2183 | args[2] = arg2; | |
2184 | args[3] = arg3; | |
2185 | args[4] = arg4; | |
2186 | args[5] = arg5; | |
2187 | args[6] = arg6; | |
2188 | GCPRO1 (args[0]); | |
2189 | gcpro1.nvars = 7; | |
2190 | RETURN_UNGCPRO (Ffuncall (7, args)); | |
2191 | #else /* not NO_ARG_ARRAY */ | |
2192 | GCPRO1 (fn); | |
2193 | gcpro1.nvars = 7; | |
2194 | RETURN_UNGCPRO (Ffuncall (7, &fn)); | |
2195 | #endif /* not NO_ARG_ARRAY */ | |
2196 | } | |
2197 | ||
db9f0278 JB |
2198 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, |
2199 | "Call first argument as a function, passing remaining arguments to it.\n\ | |
fd7fe9a1 | 2200 | Return the value that function returns.\n\ |
db9f0278 JB |
2201 | Thus, (funcall 'cons 'x 'y) returns (x . y).") |
2202 | (nargs, args) | |
2203 | int nargs; | |
2204 | Lisp_Object *args; | |
2205 | { | |
2206 | Lisp_Object fun; | |
2207 | Lisp_Object funcar; | |
2208 | int numargs = nargs - 1; | |
2209 | Lisp_Object lisp_numargs; | |
2210 | Lisp_Object val; | |
2211 | struct backtrace backtrace; | |
2212 | register Lisp_Object *internal_args; | |
2213 | register int i; | |
2214 | ||
2215 | QUIT; | |
2216 | if (consing_since_gc > gc_cons_threshold) | |
a6e3fa71 | 2217 | Fgarbage_collect (); |
db9f0278 JB |
2218 | |
2219 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
2220 | { | |
2221 | if (max_lisp_eval_depth < 100) | |
2222 | max_lisp_eval_depth = 100; | |
2223 | if (lisp_eval_depth > max_lisp_eval_depth) | |
2224 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
2225 | } | |
2226 | ||
2227 | backtrace.next = backtrace_list; | |
2228 | backtrace_list = &backtrace; | |
2229 | backtrace.function = &args[0]; | |
2230 | backtrace.args = &args[1]; | |
2231 | backtrace.nargs = nargs - 1; | |
2232 | backtrace.evalargs = 0; | |
2233 | backtrace.debug_on_exit = 0; | |
2234 | ||
2235 | if (debug_on_next_call) | |
2236 | do_debug_on_call (Qlambda); | |
2237 | ||
2238 | retry: | |
2239 | ||
2240 | fun = args[0]; | |
ffd56f97 JB |
2241 | |
2242 | fun = Findirect_function (fun); | |
db9f0278 | 2243 | |
90165123 | 2244 | if (SUBRP (fun)) |
db9f0278 JB |
2245 | { |
2246 | if (numargs < XSUBR (fun)->min_args | |
2247 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
2248 | { | |
a631e24c | 2249 | XSETFASTINT (lisp_numargs, numargs); |
db9f0278 JB |
2250 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (lisp_numargs, Qnil))); |
2251 | } | |
2252 | ||
2253 | if (XSUBR (fun)->max_args == UNEVALLED) | |
2254 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2255 | ||
2256 | if (XSUBR (fun)->max_args == MANY) | |
2257 | { | |
2258 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
2259 | goto done; | |
2260 | } | |
2261 | ||
2262 | if (XSUBR (fun)->max_args > numargs) | |
2263 | { | |
2264 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
2265 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
2266 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
2267 | internal_args[i] = Qnil; | |
2268 | } | |
2269 | else | |
2270 | internal_args = args + 1; | |
2271 | switch (XSUBR (fun)->max_args) | |
2272 | { | |
2273 | case 0: | |
2274 | val = (*XSUBR (fun)->function) (); | |
2275 | goto done; | |
2276 | case 1: | |
2277 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
2278 | goto done; | |
2279 | case 2: | |
2280 | val = (*XSUBR (fun)->function) (internal_args[0], | |
2281 | internal_args[1]); | |
2282 | goto done; | |
2283 | case 3: | |
2284 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2285 | internal_args[2]); | |
2286 | goto done; | |
2287 | case 4: | |
2288 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2289 | internal_args[2], | |
2290 | internal_args[3]); | |
2291 | goto done; | |
2292 | case 5: | |
2293 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2294 | internal_args[2], internal_args[3], | |
2295 | internal_args[4]); | |
2296 | goto done; | |
2297 | case 6: | |
2298 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2299 | internal_args[2], internal_args[3], | |
2300 | internal_args[4], internal_args[5]); | |
2301 | goto done; | |
15c65264 RS |
2302 | case 7: |
2303 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
2304 | internal_args[2], internal_args[3], | |
2305 | internal_args[4], internal_args[5], | |
2306 | internal_args[6]); | |
2307 | goto done; | |
db9f0278 JB |
2308 | |
2309 | default: | |
70ee42f7 JB |
2310 | |
2311 | /* If a subr takes more than 6 arguments without using MANY | |
2312 | or UNEVALLED, we need to extend this function to support it. | |
2313 | Until this is done, there is no way to call the function. */ | |
2314 | abort (); | |
db9f0278 JB |
2315 | } |
2316 | } | |
90165123 | 2317 | if (COMPILEDP (fun)) |
db9f0278 JB |
2318 | val = funcall_lambda (fun, numargs, args + 1); |
2319 | else | |
2320 | { | |
2321 | if (!CONSP (fun)) | |
2322 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2323 | funcar = Fcar (fun); | |
90165123 | 2324 | if (!SYMBOLP (funcar)) |
db9f0278 JB |
2325 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
2326 | if (EQ (funcar, Qlambda)) | |
2327 | val = funcall_lambda (fun, numargs, args + 1); | |
2328 | else if (EQ (funcar, Qmocklisp)) | |
2329 | val = ml_apply (fun, Flist (numargs, args + 1)); | |
2330 | else if (EQ (funcar, Qautoload)) | |
2331 | { | |
2332 | do_autoload (fun, args[0]); | |
2333 | goto retry; | |
2334 | } | |
2335 | else | |
2336 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
2337 | } | |
2338 | done: | |
2339 | lisp_eval_depth--; | |
2340 | if (backtrace.debug_on_exit) | |
2341 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
2342 | backtrace_list = backtrace.next; | |
2343 | return val; | |
2344 | } | |
2345 | \f | |
2346 | Lisp_Object | |
2347 | apply_lambda (fun, args, eval_flag) | |
2348 | Lisp_Object fun, args; | |
2349 | int eval_flag; | |
2350 | { | |
2351 | Lisp_Object args_left; | |
2352 | Lisp_Object numargs; | |
2353 | register Lisp_Object *arg_vector; | |
2354 | struct gcpro gcpro1, gcpro2, gcpro3; | |
2355 | register int i; | |
2356 | register Lisp_Object tem; | |
2357 | ||
2358 | numargs = Flength (args); | |
2359 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
2360 | args_left = args; | |
2361 | ||
2362 | GCPRO3 (*arg_vector, args_left, fun); | |
2363 | gcpro1.nvars = 0; | |
2364 | ||
2365 | for (i = 0; i < XINT (numargs);) | |
2366 | { | |
2367 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
2368 | if (eval_flag) tem = Feval (tem); | |
2369 | arg_vector[i++] = tem; | |
2370 | gcpro1.nvars = i; | |
2371 | } | |
2372 | ||
2373 | UNGCPRO; | |
2374 | ||
2375 | if (eval_flag) | |
2376 | { | |
2377 | backtrace_list->args = arg_vector; | |
2378 | backtrace_list->nargs = i; | |
2379 | } | |
2380 | backtrace_list->evalargs = 0; | |
2381 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
2382 | ||
2383 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
2384 | if (backtrace_list->debug_on_exit) | |
2385 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
2386 | /* Don't do it again when we return to eval. */ | |
2387 | backtrace_list->debug_on_exit = 0; | |
2388 | return tem; | |
2389 | } | |
2390 | ||
2391 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
2392 | and return the result of evaluation. | |
2393 | FUN must be either a lambda-expression or a compiled-code object. */ | |
2394 | ||
2395 | Lisp_Object | |
2396 | funcall_lambda (fun, nargs, arg_vector) | |
2397 | Lisp_Object fun; | |
2398 | int nargs; | |
2399 | register Lisp_Object *arg_vector; | |
2400 | { | |
2401 | Lisp_Object val, tem; | |
2402 | register Lisp_Object syms_left; | |
2403 | Lisp_Object numargs; | |
2404 | register Lisp_Object next; | |
2405 | int count = specpdl_ptr - specpdl; | |
2406 | register int i; | |
2407 | int optional = 0, rest = 0; | |
2408 | ||
2409 | specbind (Qmocklisp_arguments, Qt); /* t means NOT mocklisp! */ | |
2410 | ||
a631e24c | 2411 | XSETFASTINT (numargs, nargs); |
db9f0278 | 2412 | |
90165123 | 2413 | if (CONSP (fun)) |
db9f0278 | 2414 | syms_left = Fcar (Fcdr (fun)); |
90165123 | 2415 | else if (COMPILEDP (fun)) |
db9f0278 JB |
2416 | syms_left = XVECTOR (fun)->contents[COMPILED_ARGLIST]; |
2417 | else abort (); | |
2418 | ||
2419 | i = 0; | |
265a9e55 | 2420 | for (; !NILP (syms_left); syms_left = Fcdr (syms_left)) |
db9f0278 JB |
2421 | { |
2422 | QUIT; | |
2423 | next = Fcar (syms_left); | |
90165123 | 2424 | while (!SYMBOLP (next)) |
9ffa21d4 | 2425 | next = Fsignal (Qinvalid_function, Fcons (fun, Qnil)); |
db9f0278 JB |
2426 | if (EQ (next, Qand_rest)) |
2427 | rest = 1; | |
2428 | else if (EQ (next, Qand_optional)) | |
2429 | optional = 1; | |
2430 | else if (rest) | |
2431 | { | |
9ffa21d4 | 2432 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
2433 | i = nargs; |
2434 | } | |
2435 | else if (i < nargs) | |
2436 | { | |
2437 | tem = arg_vector[i++]; | |
2438 | specbind (next, tem); | |
2439 | } | |
2440 | else if (!optional) | |
2441 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
2442 | else | |
2443 | specbind (next, Qnil); | |
2444 | } | |
2445 | ||
2446 | if (i < nargs) | |
2447 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
2448 | ||
90165123 | 2449 | if (CONSP (fun)) |
db9f0278 JB |
2450 | val = Fprogn (Fcdr (Fcdr (fun))); |
2451 | else | |
ca248607 RS |
2452 | { |
2453 | /* If we have not actually read the bytecode string | |
2454 | and constants vector yet, fetch them from the file. */ | |
2455 | if (CONSP (XVECTOR (fun)->contents[COMPILED_BYTECODE])) | |
661c7d6e | 2456 | Ffetch_bytecode (fun); |
ca248607 RS |
2457 | val = Fbyte_code (XVECTOR (fun)->contents[COMPILED_BYTECODE], |
2458 | XVECTOR (fun)->contents[COMPILED_CONSTANTS], | |
2459 | XVECTOR (fun)->contents[COMPILED_STACK_DEPTH]); | |
2460 | } | |
db9f0278 JB |
2461 | return unbind_to (count, val); |
2462 | } | |
661c7d6e KH |
2463 | |
2464 | DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode, | |
2465 | 1, 1, 0, | |
2466 | "If byte-compiled OBJECT is lazy-loaded, fetch it now.") | |
2467 | (object) | |
2468 | Lisp_Object object; | |
2469 | { | |
2470 | Lisp_Object tem; | |
2471 | ||
2472 | if (COMPILEDP (object) | |
2473 | && CONSP (XVECTOR (object)->contents[COMPILED_BYTECODE])) | |
2474 | { | |
2475 | tem = read_doc_string (XVECTOR (object)->contents[COMPILED_BYTECODE]); | |
5bbdb090 RS |
2476 | if (!CONSP (tem)) |
2477 | error ("invalid byte code"); | |
661c7d6e KH |
2478 | XVECTOR (object)->contents[COMPILED_BYTECODE] = XCONS (tem)->car; |
2479 | XVECTOR (object)->contents[COMPILED_CONSTANTS] = XCONS (tem)->cdr; | |
2480 | } | |
2481 | return object; | |
2482 | } | |
db9f0278 JB |
2483 | \f |
2484 | void | |
2485 | grow_specpdl () | |
2486 | { | |
2487 | register int count = specpdl_ptr - specpdl; | |
2488 | if (specpdl_size >= max_specpdl_size) | |
2489 | { | |
2490 | if (max_specpdl_size < 400) | |
2491 | max_specpdl_size = 400; | |
2492 | if (specpdl_size >= max_specpdl_size) | |
2493 | { | |
debee8fe RS |
2494 | if (!NILP (Vdebug_on_error)) |
2495 | /* Leave room for some specpdl in the debugger. */ | |
2496 | max_specpdl_size = specpdl_size + 100; | |
db9f0278 JB |
2497 | Fsignal (Qerror, |
2498 | Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil)); | |
db9f0278 JB |
2499 | } |
2500 | } | |
2501 | specpdl_size *= 2; | |
2502 | if (specpdl_size > max_specpdl_size) | |
2503 | specpdl_size = max_specpdl_size; | |
2504 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
2505 | specpdl_ptr = specpdl + count; | |
2506 | } | |
2507 | ||
2508 | void | |
2509 | specbind (symbol, value) | |
2510 | Lisp_Object symbol, value; | |
2511 | { | |
db9f0278 JB |
2512 | Lisp_Object ovalue; |
2513 | ||
9ffa21d4 JB |
2514 | CHECK_SYMBOL (symbol, 0); |
2515 | ||
db9f0278 JB |
2516 | if (specpdl_ptr == specpdl + specpdl_size) |
2517 | grow_specpdl (); | |
2518 | specpdl_ptr->symbol = symbol; | |
2519 | specpdl_ptr->func = 0; | |
d0f7cdc8 | 2520 | specpdl_ptr->old_value = ovalue = find_symbol_value (symbol); |
db9f0278 | 2521 | specpdl_ptr++; |
3d8585a1 | 2522 | if (BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue)) |
db9f0278 JB |
2523 | store_symval_forwarding (symbol, ovalue, value); |
2524 | else | |
2525 | Fset (symbol, value); | |
2526 | } | |
2527 | ||
2528 | void | |
2529 | record_unwind_protect (function, arg) | |
2530 | Lisp_Object (*function)(); | |
2531 | Lisp_Object arg; | |
2532 | { | |
2533 | if (specpdl_ptr == specpdl + specpdl_size) | |
2534 | grow_specpdl (); | |
2535 | specpdl_ptr->func = function; | |
2536 | specpdl_ptr->symbol = Qnil; | |
2537 | specpdl_ptr->old_value = arg; | |
2538 | specpdl_ptr++; | |
2539 | } | |
2540 | ||
2541 | Lisp_Object | |
2542 | unbind_to (count, value) | |
2543 | int count; | |
2544 | Lisp_Object value; | |
2545 | { | |
265a9e55 | 2546 | int quitf = !NILP (Vquit_flag); |
db9f0278 JB |
2547 | struct gcpro gcpro1; |
2548 | ||
2549 | GCPRO1 (value); | |
2550 | ||
2551 | Vquit_flag = Qnil; | |
2552 | ||
2553 | while (specpdl_ptr != specpdl + count) | |
2554 | { | |
2555 | --specpdl_ptr; | |
2556 | if (specpdl_ptr->func != 0) | |
2557 | (*specpdl_ptr->func) (specpdl_ptr->old_value); | |
2558 | /* Note that a "binding" of nil is really an unwind protect, | |
2559 | so in that case the "old value" is a list of forms to evaluate. */ | |
265a9e55 | 2560 | else if (NILP (specpdl_ptr->symbol)) |
db9f0278 JB |
2561 | Fprogn (specpdl_ptr->old_value); |
2562 | else | |
2563 | Fset (specpdl_ptr->symbol, specpdl_ptr->old_value); | |
2564 | } | |
265a9e55 | 2565 | if (NILP (Vquit_flag) && quitf) Vquit_flag = Qt; |
db9f0278 JB |
2566 | |
2567 | UNGCPRO; | |
2568 | ||
2569 | return value; | |
2570 | } | |
2571 | \f | |
2572 | #if 0 | |
2573 | ||
2574 | /* Get the value of symbol's global binding, even if that binding | |
2575 | is not now dynamically visible. */ | |
2576 | ||
2577 | Lisp_Object | |
2578 | top_level_value (symbol) | |
2579 | Lisp_Object symbol; | |
2580 | { | |
2581 | register struct specbinding *ptr = specpdl; | |
2582 | ||
2583 | CHECK_SYMBOL (symbol, 0); | |
2584 | for (; ptr != specpdl_ptr; ptr++) | |
2585 | { | |
2586 | if (EQ (ptr->symbol, symbol)) | |
2587 | return ptr->old_value; | |
2588 | } | |
2589 | return Fsymbol_value (symbol); | |
2590 | } | |
2591 | ||
2592 | Lisp_Object | |
2593 | top_level_set (symbol, newval) | |
2594 | Lisp_Object symbol, newval; | |
2595 | { | |
2596 | register struct specbinding *ptr = specpdl; | |
2597 | ||
2598 | CHECK_SYMBOL (symbol, 0); | |
2599 | for (; ptr != specpdl_ptr; ptr++) | |
2600 | { | |
2601 | if (EQ (ptr->symbol, symbol)) | |
2602 | { | |
2603 | ptr->old_value = newval; | |
2604 | return newval; | |
2605 | } | |
2606 | } | |
2607 | return Fset (symbol, newval); | |
2608 | } | |
2609 | ||
2610 | #endif /* 0 */ | |
2611 | \f | |
2612 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, | |
2613 | "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\ | |
2614 | The debugger is entered when that frame exits, if the flag is non-nil.") | |
2615 | (level, flag) | |
2616 | Lisp_Object level, flag; | |
2617 | { | |
2618 | register struct backtrace *backlist = backtrace_list; | |
2619 | register int i; | |
2620 | ||
2621 | CHECK_NUMBER (level, 0); | |
2622 | ||
2623 | for (i = 0; backlist && i < XINT (level); i++) | |
2624 | { | |
2625 | backlist = backlist->next; | |
2626 | } | |
2627 | ||
2628 | if (backlist) | |
265a9e55 | 2629 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
2630 | |
2631 | return flag; | |
2632 | } | |
2633 | ||
2634 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
2635 | "Print a trace of Lisp function calls currently active.\n\ | |
2636 | Output stream used is value of `standard-output'.") | |
2637 | () | |
2638 | { | |
2639 | register struct backtrace *backlist = backtrace_list; | |
2640 | register int i; | |
2641 | Lisp_Object tail; | |
2642 | Lisp_Object tem; | |
2643 | extern Lisp_Object Vprint_level; | |
2644 | struct gcpro gcpro1; | |
2645 | ||
a631e24c | 2646 | XSETFASTINT (Vprint_level, 3); |
db9f0278 JB |
2647 | |
2648 | tail = Qnil; | |
2649 | GCPRO1 (tail); | |
2650 | ||
2651 | while (backlist) | |
2652 | { | |
2653 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
2654 | if (backlist->nargs == UNEVALLED) | |
2655 | { | |
2656 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
b6703b02 | 2657 | write_string ("\n", -1); |
db9f0278 JB |
2658 | } |
2659 | else | |
2660 | { | |
2661 | tem = *backlist->function; | |
2662 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
2663 | write_string ("(", -1); | |
2664 | if (backlist->nargs == MANY) | |
2665 | { | |
2666 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 2667 | !NILP (tail); |
db9f0278 JB |
2668 | tail = Fcdr (tail), i++) |
2669 | { | |
2670 | if (i) write_string (" ", -1); | |
2671 | Fprin1 (Fcar (tail), Qnil); | |
2672 | } | |
2673 | } | |
2674 | else | |
2675 | { | |
2676 | for (i = 0; i < backlist->nargs; i++) | |
2677 | { | |
2678 | if (i) write_string (" ", -1); | |
2679 | Fprin1 (backlist->args[i], Qnil); | |
2680 | } | |
2681 | } | |
b6703b02 | 2682 | write_string (")\n", -1); |
db9f0278 | 2683 | } |
db9f0278 JB |
2684 | backlist = backlist->next; |
2685 | } | |
2686 | ||
2687 | Vprint_level = Qnil; | |
2688 | UNGCPRO; | |
2689 | return Qnil; | |
2690 | } | |
2691 | ||
2692 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, "", | |
2693 | "Return the function and arguments N frames up from current execution point.\n\ | |
2694 | If that frame has not evaluated the arguments yet (or is a special form),\n\ | |
2695 | the value is (nil FUNCTION ARG-FORMS...).\n\ | |
2696 | If that frame has evaluated its arguments and called its function already,\n\ | |
2697 | the value is (t FUNCTION ARG-VALUES...).\n\ | |
2698 | A &rest arg is represented as the tail of the list ARG-VALUES.\n\ | |
2699 | FUNCTION is whatever was supplied as car of evaluated list,\n\ | |
2700 | or a lambda expression for macro calls.\n\ | |
2701 | If N is more than the number of frames, the value is nil.") | |
2702 | (nframes) | |
2703 | Lisp_Object nframes; | |
2704 | { | |
2705 | register struct backtrace *backlist = backtrace_list; | |
2706 | register int i; | |
2707 | Lisp_Object tem; | |
2708 | ||
2709 | CHECK_NATNUM (nframes, 0); | |
2710 | ||
2711 | /* Find the frame requested. */ | |
b6703b02 | 2712 | for (i = 0; backlist && i < XFASTINT (nframes); i++) |
db9f0278 JB |
2713 | backlist = backlist->next; |
2714 | ||
2715 | if (!backlist) | |
2716 | return Qnil; | |
2717 | if (backlist->nargs == UNEVALLED) | |
2718 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
2719 | else | |
2720 | { | |
2721 | if (backlist->nargs == MANY) | |
2722 | tem = *backlist->args; | |
2723 | else | |
2724 | tem = Flist (backlist->nargs, backlist->args); | |
2725 | ||
2726 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
2727 | } | |
2728 | } | |
2729 | \f | |
2730 | syms_of_eval () | |
2731 | { | |
2732 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
2733 | "Limit on number of Lisp variable bindings & unwind-protects before error."); | |
2734 | ||
2735 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
2736 | "Limit on depth in `eval', `apply' and `funcall' before error.\n\ | |
2737 | This limit is to catch infinite recursions for you before they cause\n\ | |
2738 | actual stack overflow in C, which would be fatal for Emacs.\n\ | |
2739 | You can safely make it considerably larger than its default value,\n\ | |
2740 | if that proves inconveniently small."); | |
2741 | ||
2742 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
2743 | "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\ | |
d0b68896 | 2744 | Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'."); |
db9f0278 JB |
2745 | Vquit_flag = Qnil; |
2746 | ||
2747 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
2748 | "Non-nil inhibits C-g quitting from happening immediately.\n\ | |
2749 | Note that `quit-flag' will still be set by typing C-g,\n\ | |
2750 | so a quit will be signalled as soon as `inhibit-quit' is nil.\n\ | |
2751 | To prevent this happening, set `quit-flag' to nil\n\ | |
2752 | before making `inhibit-quit' nil."); | |
2753 | Vinhibit_quit = Qnil; | |
2754 | ||
ad236261 JB |
2755 | Qinhibit_quit = intern ("inhibit-quit"); |
2756 | staticpro (&Qinhibit_quit); | |
2757 | ||
db9f0278 JB |
2758 | Qautoload = intern ("autoload"); |
2759 | staticpro (&Qautoload); | |
2760 | ||
2761 | Qdebug_on_error = intern ("debug-on-error"); | |
2762 | staticpro (&Qdebug_on_error); | |
2763 | ||
2764 | Qmacro = intern ("macro"); | |
2765 | staticpro (&Qmacro); | |
2766 | ||
2767 | /* Note that the process handling also uses Qexit, but we don't want | |
2768 | to staticpro it twice, so we just do it here. */ | |
2769 | Qexit = intern ("exit"); | |
2770 | staticpro (&Qexit); | |
2771 | ||
2772 | Qinteractive = intern ("interactive"); | |
2773 | staticpro (&Qinteractive); | |
2774 | ||
2775 | Qcommandp = intern ("commandp"); | |
2776 | staticpro (&Qcommandp); | |
2777 | ||
2778 | Qdefun = intern ("defun"); | |
2779 | staticpro (&Qdefun); | |
2780 | ||
2781 | Qand_rest = intern ("&rest"); | |
2782 | staticpro (&Qand_rest); | |
2783 | ||
2784 | Qand_optional = intern ("&optional"); | |
2785 | staticpro (&Qand_optional); | |
2786 | ||
128c0f66 | 2787 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
db9f0278 | 2788 | "*Non-nil means automatically display a backtrace buffer\n\ |
128c0f66 RM |
2789 | after any error that is handled by the editor command loop.\n\ |
2790 | If the value is a list, an error only means to display a backtrace\n\ | |
2791 | if one of its condition symbols appears in the list."); | |
2792 | Vstack_trace_on_error = Qnil; | |
db9f0278 | 2793 | |
128c0f66 | 2794 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
db9f0278 JB |
2795 | "*Non-nil means enter debugger if an error is signaled.\n\ |
2796 | Does not apply to errors handled by `condition-case'.\n\ | |
128c0f66 RM |
2797 | If the value is a list, an error only means to enter the debugger\n\ |
2798 | if one of its condition symbols appears in the list.\n\ | |
db9f0278 | 2799 | See also variable `debug-on-quit'."); |
128c0f66 | 2800 | Vdebug_on_error = Qnil; |
db9f0278 JB |
2801 | |
2802 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, | |
d0b68896 | 2803 | "*Non-nil means enter debugger if quit is signaled (C-g, for example).\n\ |
1b7d8239 | 2804 | Does not apply if quit is handled by a `condition-case'."); |
db9f0278 JB |
2805 | debug_on_quit = 0; |
2806 | ||
2807 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
2808 | "Non-nil means enter debugger before next `eval', `apply' or `funcall'."); | |
2809 | ||
2810 | DEFVAR_LISP ("debugger", &Vdebugger, | |
2811 | "Function to call to invoke debugger.\n\ | |
2812 | If due to frame exit, args are `exit' and the value being returned;\n\ | |
2813 | this function's value will be returned instead of that.\n\ | |
2814 | If due to error, args are `error' and a list of the args to `signal'.\n\ | |
2815 | If due to `apply' or `funcall' entry, one arg, `lambda'.\n\ | |
2816 | If due to `eval' entry, one arg, t."); | |
2817 | Vdebugger = Qnil; | |
2818 | ||
2819 | Qmocklisp_arguments = intern ("mocklisp-arguments"); | |
2820 | staticpro (&Qmocklisp_arguments); | |
2821 | DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments, | |
2822 | "While in a mocklisp function, the list of its unevaluated args."); | |
2823 | Vmocklisp_arguments = Qt; | |
2824 | ||
2825 | DEFVAR_LISP ("run-hooks", &Vrun_hooks, | |
2826 | "Set to the function `run-hooks', if that function has been defined.\n\ | |
2827 | Otherwise, nil (in a bare Emacs without preloaded Lisp code)."); | |
db9f0278 JB |
2828 | |
2829 | staticpro (&Vautoload_queue); | |
2830 | Vautoload_queue = Qnil; | |
2831 | ||
2832 | defsubr (&Sor); | |
2833 | defsubr (&Sand); | |
2834 | defsubr (&Sif); | |
2835 | defsubr (&Scond); | |
2836 | defsubr (&Sprogn); | |
2837 | defsubr (&Sprog1); | |
2838 | defsubr (&Sprog2); | |
2839 | defsubr (&Ssetq); | |
2840 | defsubr (&Squote); | |
2841 | defsubr (&Sfunction); | |
2842 | defsubr (&Sdefun); | |
2843 | defsubr (&Sdefmacro); | |
2844 | defsubr (&Sdefvar); | |
2845 | defsubr (&Sdefconst); | |
2846 | defsubr (&Suser_variable_p); | |
2847 | defsubr (&Slet); | |
2848 | defsubr (&SletX); | |
2849 | defsubr (&Swhile); | |
2850 | defsubr (&Smacroexpand); | |
2851 | defsubr (&Scatch); | |
2852 | defsubr (&Sthrow); | |
2853 | defsubr (&Sunwind_protect); | |
2854 | defsubr (&Scondition_case); | |
2855 | defsubr (&Ssignal); | |
2856 | defsubr (&Sinteractive_p); | |
2857 | defsubr (&Scommandp); | |
2858 | defsubr (&Sautoload); | |
2859 | defsubr (&Seval); | |
2860 | defsubr (&Sapply); | |
2861 | defsubr (&Sfuncall); | |
ff936e53 SM |
2862 | defsubr (&Srun_hooks); |
2863 | defsubr (&Srun_hook_with_args); | |
2864 | defsubr (&Srun_hook_with_args_until_success); | |
2865 | defsubr (&Srun_hook_with_args_until_failure); | |
661c7d6e | 2866 | defsubr (&Sfetch_bytecode); |
db9f0278 JB |
2867 | defsubr (&Sbacktrace_debug); |
2868 | defsubr (&Sbacktrace); | |
2869 | defsubr (&Sbacktrace_frame); | |
2870 | } |