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db9f0278 | 1 | /* Evaluator for GNU Emacs Lisp interpreter. |
70ee42f7 | 2 | Copyright (C) 1985, 1986, 1987, 1992 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 | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
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 | ||
21 | #include "config.h" | |
22 | #include "lisp.h" | |
23 | #ifdef HAVE_X_WINDOWS | |
24 | #include "xterm.h" | |
25 | #endif | |
26 | ||
27 | #ifndef standalone | |
28 | #include "commands.h" | |
1f98fa48 | 29 | #include "keyboard.h" |
db9f0278 JB |
30 | #else |
31 | #define INTERACTIVE 1 | |
32 | #endif | |
33 | ||
34 | #include <setjmp.h> | |
35 | ||
36 | /* This definition is duplicated in alloc.c and keyboard.c */ | |
37 | /* Putting it in lisp.h makes cc bomb out! */ | |
38 | ||
39 | struct backtrace | |
40 | { | |
41 | struct backtrace *next; | |
42 | Lisp_Object *function; | |
43 | Lisp_Object *args; /* Points to vector of args. */ | |
daa37602 JB |
44 | int nargs; /* Length of vector. |
45 | If nargs is UNEVALLED, args points to slot holding | |
46 | list of unevalled args */ | |
db9f0278 JB |
47 | char evalargs; |
48 | /* Nonzero means call value of debugger when done with this operation. */ | |
49 | char debug_on_exit; | |
50 | }; | |
51 | ||
52 | struct backtrace *backtrace_list; | |
53 | ||
54 | struct catchtag | |
55 | { | |
56 | Lisp_Object tag; | |
57 | Lisp_Object val; | |
58 | struct catchtag *next; | |
59 | struct gcpro *gcpro; | |
60 | jmp_buf jmp; | |
61 | struct backtrace *backlist; | |
62 | struct handler *handlerlist; | |
63 | int lisp_eval_depth; | |
64 | int pdlcount; | |
65 | int poll_suppress_count; | |
66 | }; | |
67 | ||
68 | struct catchtag *catchlist; | |
69 | ||
70 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; | |
ad236261 | 71 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
db9f0278 JB |
72 | Lisp_Object Qmocklisp_arguments, Vmocklisp_arguments, Qmocklisp; |
73 | Lisp_Object Qand_rest, Qand_optional; | |
74 | Lisp_Object Qdebug_on_error; | |
75 | ||
76 | Lisp_Object Vrun_hooks; | |
77 | ||
78 | /* Non-nil means record all fset's and provide's, to be undone | |
79 | if the file being autoloaded is not fully loaded. | |
80 | They are recorded by being consed onto the front of Vautoload_queue: | |
81 | (FUN . ODEF) for a defun, (OFEATURES . nil) for a provide. */ | |
82 | ||
83 | Lisp_Object Vautoload_queue; | |
84 | ||
85 | /* Current number of specbindings allocated in specpdl. */ | |
86 | int specpdl_size; | |
87 | ||
88 | /* Pointer to beginning of specpdl. */ | |
89 | struct specbinding *specpdl; | |
90 | ||
91 | /* Pointer to first unused element in specpdl. */ | |
92 | struct specbinding *specpdl_ptr; | |
93 | ||
94 | /* Maximum size allowed for specpdl allocation */ | |
95 | int max_specpdl_size; | |
96 | ||
97 | /* Depth in Lisp evaluations and function calls. */ | |
98 | int lisp_eval_depth; | |
99 | ||
100 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
101 | int max_lisp_eval_depth; | |
102 | ||
103 | /* Nonzero means enter debugger before next function call */ | |
104 | int debug_on_next_call; | |
105 | ||
128c0f66 | 106 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 107 | if an error is handled by the command loop's error handler. */ |
128c0f66 | 108 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 109 | |
128c0f66 | 110 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 111 | if an error is handled by the command loop's error handler. */ |
128c0f66 | 112 | Lisp_Object Vdebug_on_error; |
db9f0278 JB |
113 | |
114 | /* Nonzero means enter debugger if a quit signal | |
128c0f66 | 115 | is handled by the command loop's error handler. */ |
db9f0278 JB |
116 | int debug_on_quit; |
117 | ||
118 | /* Nonzero means we are trying to enter the debugger. | |
119 | This is to prevent recursive attempts. */ | |
120 | int entering_debugger; | |
121 | ||
122 | Lisp_Object Vdebugger; | |
123 | ||
124 | void specbind (), record_unwind_protect (); | |
125 | ||
126 | Lisp_Object funcall_lambda (); | |
127 | extern Lisp_Object ml_apply (); /* Apply a mocklisp function to unevaluated argument list */ | |
128 | ||
129 | init_eval_once () | |
130 | { | |
131 | specpdl_size = 50; | |
132 | specpdl = (struct specbinding *) malloc (specpdl_size * sizeof (struct specbinding)); | |
133 | max_specpdl_size = 600; | |
134 | max_lisp_eval_depth = 200; | |
135 | } | |
136 | ||
137 | init_eval () | |
138 | { | |
139 | specpdl_ptr = specpdl; | |
140 | catchlist = 0; | |
141 | handlerlist = 0; | |
142 | backtrace_list = 0; | |
143 | Vquit_flag = Qnil; | |
144 | debug_on_next_call = 0; | |
145 | lisp_eval_depth = 0; | |
146 | entering_debugger = 0; | |
147 | } | |
148 | ||
149 | Lisp_Object | |
150 | call_debugger (arg) | |
151 | Lisp_Object arg; | |
152 | { | |
153 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
154 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
155 | if (specpdl_size + 40 > max_specpdl_size) | |
156 | max_specpdl_size = specpdl_size + 40; | |
157 | debug_on_next_call = 0; | |
158 | entering_debugger = 1; | |
159 | return apply1 (Vdebugger, arg); | |
160 | } | |
161 | ||
162 | do_debug_on_call (code) | |
163 | Lisp_Object code; | |
164 | { | |
165 | debug_on_next_call = 0; | |
166 | backtrace_list->debug_on_exit = 1; | |
167 | call_debugger (Fcons (code, Qnil)); | |
168 | } | |
169 | \f | |
170 | /* NOTE!!! Every function that can call EVAL must protect its args | |
171 | and temporaries from garbage collection while it needs them. | |
172 | The definition of `For' shows what you have to do. */ | |
173 | ||
174 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
175 | "Eval args until one of them yields non-nil, then return that value.\n\ | |
176 | The remaining args are not evalled at all.\n\ | |
177 | If all args return nil, return nil.") | |
178 | (args) | |
179 | Lisp_Object args; | |
180 | { | |
181 | register Lisp_Object val; | |
182 | Lisp_Object args_left; | |
183 | struct gcpro gcpro1; | |
184 | ||
265a9e55 | 185 | if (NILP(args)) |
db9f0278 JB |
186 | return Qnil; |
187 | ||
188 | args_left = args; | |
189 | GCPRO1 (args_left); | |
190 | ||
191 | do | |
192 | { | |
193 | val = Feval (Fcar (args_left)); | |
265a9e55 | 194 | if (!NILP (val)) |
db9f0278 JB |
195 | break; |
196 | args_left = Fcdr (args_left); | |
197 | } | |
265a9e55 | 198 | while (!NILP(args_left)); |
db9f0278 JB |
199 | |
200 | UNGCPRO; | |
201 | return val; | |
202 | } | |
203 | ||
204 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
205 | "Eval args until one of them yields nil, then return nil.\n\ | |
206 | The remaining args are not evalled at all.\n\ | |
207 | If no arg yields nil, return the last arg's value.") | |
208 | (args) | |
209 | Lisp_Object args; | |
210 | { | |
211 | register Lisp_Object val; | |
212 | Lisp_Object args_left; | |
213 | struct gcpro gcpro1; | |
214 | ||
265a9e55 | 215 | if (NILP(args)) |
db9f0278 JB |
216 | return Qt; |
217 | ||
218 | args_left = args; | |
219 | GCPRO1 (args_left); | |
220 | ||
221 | do | |
222 | { | |
223 | val = Feval (Fcar (args_left)); | |
265a9e55 | 224 | if (NILP (val)) |
db9f0278 JB |
225 | break; |
226 | args_left = Fcdr (args_left); | |
227 | } | |
265a9e55 | 228 | while (!NILP(args_left)); |
db9f0278 JB |
229 | |
230 | UNGCPRO; | |
231 | return val; | |
232 | } | |
233 | ||
234 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
235 | "(if COND THEN ELSE...): if COND yields non-nil, do THEN, else do ELSE...\n\ | |
236 | Returns the value of THEN or the value of the last of the ELSE's.\n\ | |
237 | THEN must be one expression, but ELSE... can be zero or more expressions.\n\ | |
238 | If COND yields nil, and there are no ELSE's, the value is nil.") | |
239 | (args) | |
240 | Lisp_Object args; | |
241 | { | |
242 | register Lisp_Object cond; | |
243 | struct gcpro gcpro1; | |
244 | ||
245 | GCPRO1 (args); | |
246 | cond = Feval (Fcar (args)); | |
247 | UNGCPRO; | |
248 | ||
265a9e55 | 249 | if (!NILP (cond)) |
db9f0278 JB |
250 | return Feval (Fcar (Fcdr (args))); |
251 | return Fprogn (Fcdr (Fcdr (args))); | |
252 | } | |
253 | ||
254 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
255 | "(cond CLAUSES...): try each clause until one succeeds.\n\ | |
256 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated\n\ | |
257 | and, if the value is non-nil, this clause succeeds:\n\ | |
258 | then the expressions in BODY are evaluated and the last one's\n\ | |
259 | value is the value of the cond-form.\n\ | |
260 | If no clause succeeds, cond returns nil.\n\ | |
261 | If a clause has one element, as in (CONDITION),\n\ | |
262 | CONDITION's value if non-nil is returned from the cond-form.") | |
263 | (args) | |
264 | Lisp_Object args; | |
265 | { | |
266 | register Lisp_Object clause, val; | |
267 | struct gcpro gcpro1; | |
268 | ||
269 | val = Qnil; | |
270 | GCPRO1 (args); | |
265a9e55 | 271 | while (!NILP (args)) |
db9f0278 JB |
272 | { |
273 | clause = Fcar (args); | |
274 | val = Feval (Fcar (clause)); | |
265a9e55 | 275 | if (!NILP (val)) |
db9f0278 JB |
276 | { |
277 | if (!EQ (XCONS (clause)->cdr, Qnil)) | |
278 | val = Fprogn (XCONS (clause)->cdr); | |
279 | break; | |
280 | } | |
281 | args = XCONS (args)->cdr; | |
282 | } | |
283 | UNGCPRO; | |
284 | ||
285 | return val; | |
286 | } | |
287 | ||
288 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
289 | "(progn BODY...): eval BODY forms sequentially and return value of last one.") | |
290 | (args) | |
291 | Lisp_Object args; | |
292 | { | |
293 | register Lisp_Object val, tem; | |
294 | Lisp_Object args_left; | |
295 | struct gcpro gcpro1; | |
296 | ||
297 | /* In Mocklisp code, symbols at the front of the progn arglist | |
298 | are to be bound to zero. */ | |
299 | if (!EQ (Vmocklisp_arguments, Qt)) | |
300 | { | |
301 | val = make_number (0); | |
265a9e55 | 302 | while (!NILP (args) && (tem = Fcar (args), XTYPE (tem) == Lisp_Symbol)) |
db9f0278 JB |
303 | { |
304 | QUIT; | |
305 | specbind (tem, val), args = Fcdr (args); | |
306 | } | |
307 | } | |
308 | ||
265a9e55 | 309 | if (NILP(args)) |
db9f0278 JB |
310 | return Qnil; |
311 | ||
312 | args_left = args; | |
313 | GCPRO1 (args_left); | |
314 | ||
315 | do | |
316 | { | |
317 | val = Feval (Fcar (args_left)); | |
318 | args_left = Fcdr (args_left); | |
319 | } | |
265a9e55 | 320 | while (!NILP(args_left)); |
db9f0278 JB |
321 | |
322 | UNGCPRO; | |
323 | return val; | |
324 | } | |
325 | ||
326 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
327 | "(prog1 FIRST BODY...): eval FIRST and BODY sequentially; value from FIRST.\n\ | |
328 | The value of FIRST is saved during the evaluation of the remaining args,\n\ | |
329 | whose values are discarded.") | |
330 | (args) | |
331 | Lisp_Object args; | |
332 | { | |
333 | Lisp_Object val; | |
334 | register Lisp_Object args_left; | |
335 | struct gcpro gcpro1, gcpro2; | |
336 | register int argnum = 0; | |
337 | ||
265a9e55 | 338 | if (NILP(args)) |
db9f0278 JB |
339 | return Qnil; |
340 | ||
341 | args_left = args; | |
342 | val = Qnil; | |
343 | GCPRO2 (args, val); | |
344 | ||
345 | do | |
346 | { | |
347 | if (!(argnum++)) | |
348 | val = Feval (Fcar (args_left)); | |
349 | else | |
350 | Feval (Fcar (args_left)); | |
351 | args_left = Fcdr (args_left); | |
352 | } | |
265a9e55 | 353 | while (!NILP(args_left)); |
db9f0278 JB |
354 | |
355 | UNGCPRO; | |
356 | return val; | |
357 | } | |
358 | ||
359 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
360 | "(prog1 X Y BODY...): eval X, Y and BODY sequentially; value from Y.\n\ | |
361 | The value of Y is saved during the evaluation of the remaining args,\n\ | |
362 | whose values are discarded.") | |
363 | (args) | |
364 | Lisp_Object args; | |
365 | { | |
366 | Lisp_Object val; | |
367 | register Lisp_Object args_left; | |
368 | struct gcpro gcpro1, gcpro2; | |
369 | register int argnum = -1; | |
370 | ||
371 | val = Qnil; | |
372 | ||
265a9e55 | 373 | if (NILP(args)) |
db9f0278 JB |
374 | return Qnil; |
375 | ||
376 | args_left = args; | |
377 | val = Qnil; | |
378 | GCPRO2 (args, val); | |
379 | ||
380 | do | |
381 | { | |
382 | if (!(argnum++)) | |
383 | val = Feval (Fcar (args_left)); | |
384 | else | |
385 | Feval (Fcar (args_left)); | |
386 | args_left = Fcdr (args_left); | |
387 | } | |
265a9e55 | 388 | while (!NILP(args_left)); |
db9f0278 JB |
389 | |
390 | UNGCPRO; | |
391 | return val; | |
392 | } | |
393 | ||
394 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
395 | "(setq SYM VAL SYM VAL ...): set each SYM to the value of its VAL.\n\ | |
396 | The SYMs are not evaluated. Thus (setq x y) sets x to the value of y.\n\ | |
397 | Each SYM is set before the next VAL is computed.") | |
398 | (args) | |
399 | Lisp_Object args; | |
400 | { | |
401 | register Lisp_Object args_left; | |
402 | register Lisp_Object val, sym; | |
403 | struct gcpro gcpro1; | |
404 | ||
265a9e55 | 405 | if (NILP(args)) |
db9f0278 JB |
406 | return Qnil; |
407 | ||
408 | args_left = args; | |
409 | GCPRO1 (args); | |
410 | ||
411 | do | |
412 | { | |
413 | val = Feval (Fcar (Fcdr (args_left))); | |
414 | sym = Fcar (args_left); | |
415 | Fset (sym, val); | |
416 | args_left = Fcdr (Fcdr (args_left)); | |
417 | } | |
265a9e55 | 418 | while (!NILP(args_left)); |
db9f0278 JB |
419 | |
420 | UNGCPRO; | |
421 | return val; | |
422 | } | |
423 | ||
424 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, | |
425 | "Return the argument, without evaluating it. `(quote x)' yields `x'.") | |
426 | (args) | |
427 | Lisp_Object args; | |
428 | { | |
429 | return Fcar (args); | |
430 | } | |
431 | ||
432 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, | |
433 | "Like `quote', but preferred for objects which are functions.\n\ | |
434 | In byte compilation, `function' causes its argument to be compiled.\n\ | |
435 | `quote' cannot do that.") | |
436 | (args) | |
437 | Lisp_Object args; | |
438 | { | |
439 | return Fcar (args); | |
440 | } | |
441 | ||
442 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, | |
443 | "Return t if function in which this appears was called interactively.\n\ | |
444 | This means that the function was called with call-interactively (which\n\ | |
445 | includes being called as the binding of a key)\n\ | |
446 | and input is currently coming from the keyboard (not in keyboard macro).") | |
447 | () | |
448 | { | |
449 | register struct backtrace *btp; | |
450 | register Lisp_Object fun; | |
451 | ||
452 | if (!INTERACTIVE) | |
453 | return Qnil; | |
454 | ||
db9f0278 | 455 | btp = backtrace_list; |
daa37602 JB |
456 | |
457 | /* If this isn't a byte-compiled function, there may be a frame at | |
458 | the top for Finteractive_p itself. If so, skip it. */ | |
459 | fun = Findirect_function (*btp->function); | |
460 | if (XTYPE (fun) == Lisp_Subr | |
461 | && (struct Lisp_Subr *) XPNTR (fun) == &Sinteractive_p) | |
db9f0278 | 462 | btp = btp->next; |
daa37602 JB |
463 | |
464 | /* If we're running an Emacs 18-style byte-compiled function, there | |
465 | may be a frame for Fbytecode. Now, given the strictest | |
466 | definition, this function isn't really being called | |
467 | interactively, but because that's the way Emacs 18 always builds | |
468 | byte-compiled functions, we'll accept it for now. */ | |
469 | if (EQ (*btp->function, Qbytecode)) | |
470 | btp = btp->next; | |
471 | ||
472 | /* If this isn't a byte-compiled function, then we may now be | |
473 | looking at several frames for special forms. Skip past them. */ | |
474 | while (btp && | |
475 | btp->nargs == UNEVALLED) | |
a6e3fa71 JB |
476 | btp = btp->next; |
477 | ||
daa37602 JB |
478 | /* btp now points at the frame of the innermost function that isn't |
479 | a special form, ignoring frames for Finteractive_p and/or | |
480 | Fbytecode at the top. If this frame is for a built-in function | |
481 | (such as load or eval-region) return nil. */ | |
ffd56f97 | 482 | fun = Findirect_function (*btp->function); |
db9f0278 JB |
483 | if (XTYPE (fun) == Lisp_Subr) |
484 | return Qnil; | |
485 | /* btp points to the frame of a Lisp function that called interactive-p. | |
486 | Return t if that function was called interactively. */ | |
487 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
488 | return Qt; | |
489 | return Qnil; | |
490 | } | |
491 | ||
492 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, | |
493 | "(defun NAME ARGLIST [DOCSTRING] BODY...): define NAME as a function.\n\ | |
494 | The definition is (lambda ARGLIST [DOCSTRING] BODY...).\n\ | |
495 | See also the function `interactive'.") | |
496 | (args) | |
497 | Lisp_Object args; | |
498 | { | |
499 | register Lisp_Object fn_name; | |
500 | register Lisp_Object defn; | |
501 | ||
502 | fn_name = Fcar (args); | |
503 | defn = Fcons (Qlambda, Fcdr (args)); | |
265a9e55 | 504 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
505 | defn = Fpurecopy (defn); |
506 | Ffset (fn_name, defn); | |
507 | return fn_name; | |
508 | } | |
509 | ||
510 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
511 | "(defmacro NAME ARGLIST [DOCSTRING] BODY...): define NAME as a macro.\n\ | |
512 | The definition is (macro lambda ARGLIST [DOCSTRING] BODY...).\n\ | |
513 | When the macro is called, as in (NAME ARGS...),\n\ | |
514 | the function (lambda ARGLIST BODY...) is applied to\n\ | |
515 | the list ARGS... as it appears in the expression,\n\ | |
516 | and the result should be a form to be evaluated instead of the original.") | |
517 | (args) | |
518 | Lisp_Object args; | |
519 | { | |
520 | register Lisp_Object fn_name; | |
521 | register Lisp_Object defn; | |
522 | ||
523 | fn_name = Fcar (args); | |
524 | defn = Fcons (Qmacro, Fcons (Qlambda, Fcdr (args))); | |
265a9e55 | 525 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
526 | defn = Fpurecopy (defn); |
527 | Ffset (fn_name, defn); | |
528 | return fn_name; | |
529 | } | |
530 | ||
531 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, | |
532 | "(defvar SYMBOL INITVALUE DOCSTRING): define SYMBOL as a variable.\n\ | |
533 | You are not required to define a variable in order to use it,\n\ | |
534 | but the definition can supply documentation and an initial value\n\ | |
535 | in a way that tags can recognize.\n\n\ | |
536 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.\n\ | |
06ef7355 RS |
537 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
538 | buffer-local values are not affected.\n\ | |
db9f0278 JB |
539 | INITVALUE and DOCSTRING are optional.\n\ |
540 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ | |
541 | This means that M-x set-variable and M-x edit-options recognize it.\n\ | |
542 | If INITVALUE is missing, SYMBOL's value is not set.") | |
543 | (args) | |
544 | Lisp_Object args; | |
545 | { | |
546 | register Lisp_Object sym, tem; | |
547 | ||
548 | sym = Fcar (args); | |
549 | tem = Fcdr (args); | |
265a9e55 | 550 | if (!NILP (tem)) |
db9f0278 JB |
551 | { |
552 | tem = Fdefault_boundp (sym); | |
265a9e55 | 553 | if (NILP (tem)) |
db9f0278 JB |
554 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); |
555 | } | |
556 | tem = Fcar (Fcdr (Fcdr (args))); | |
265a9e55 | 557 | if (!NILP (tem)) |
db9f0278 | 558 | { |
265a9e55 | 559 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
560 | tem = Fpurecopy (tem); |
561 | Fput (sym, Qvariable_documentation, tem); | |
562 | } | |
563 | return sym; | |
564 | } | |
565 | ||
566 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
567 | "(defconst SYMBOL INITVALUE DOCSTRING): define SYMBOL as a constant variable.\n\ | |
568 | The intent is that programs do not change this value, but users may.\n\ | |
569 | Always sets the value of SYMBOL to the result of evalling INITVALUE.\n\ | |
06ef7355 RS |
570 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
571 | buffer-local values are not affected.\n\ | |
db9f0278 JB |
572 | DOCSTRING is optional.\n\ |
573 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ | |
574 | This means that M-x set-variable and M-x edit-options recognize it.\n\n\ | |
575 | Note: do not use `defconst' for user options in libraries that are not\n\ | |
576 | normally loaded, since it is useful for users to be able to specify\n\ | |
577 | their own values for such variables before loading the library.\n\ | |
578 | Since `defconst' unconditionally assigns the variable,\n\ | |
579 | it would override the user's choice.") | |
580 | (args) | |
581 | Lisp_Object args; | |
582 | { | |
583 | register Lisp_Object sym, tem; | |
584 | ||
585 | sym = Fcar (args); | |
586 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); | |
587 | tem = Fcar (Fcdr (Fcdr (args))); | |
265a9e55 | 588 | if (!NILP (tem)) |
db9f0278 | 589 | { |
265a9e55 | 590 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
591 | tem = Fpurecopy (tem); |
592 | Fput (sym, Qvariable_documentation, tem); | |
593 | } | |
594 | return sym; | |
595 | } | |
596 | ||
597 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, | |
598 | "Returns t if VARIABLE is intended to be set and modified by users.\n\ | |
599 | \(The alternative is a variable used internally in a Lisp program.)\n\ | |
600 | Determined by whether the first character of the documentation\n\ | |
601 | for the variable is \"*\"") | |
602 | (variable) | |
603 | Lisp_Object variable; | |
604 | { | |
605 | Lisp_Object documentation; | |
606 | ||
607 | documentation = Fget (variable, Qvariable_documentation); | |
608 | if (XTYPE (documentation) == Lisp_Int && XINT (documentation) < 0) | |
609 | return Qt; | |
610 | if ((XTYPE (documentation) == Lisp_String) && | |
611 | ((unsigned char) XSTRING (documentation)->data[0] == '*')) | |
612 | return Qt; | |
613 | return Qnil; | |
614 | } | |
615 | \f | |
616 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
617 | "(let* VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ | |
618 | The value of the last form in BODY is returned.\n\ | |
619 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
620 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
621 | Each VALUEFORM can refer to the symbols already bound by this VARLIST.") | |
622 | (args) | |
623 | Lisp_Object args; | |
624 | { | |
625 | Lisp_Object varlist, val, elt; | |
626 | int count = specpdl_ptr - specpdl; | |
627 | struct gcpro gcpro1, gcpro2, gcpro3; | |
628 | ||
629 | GCPRO3 (args, elt, varlist); | |
630 | ||
631 | varlist = Fcar (args); | |
265a9e55 | 632 | while (!NILP (varlist)) |
db9f0278 JB |
633 | { |
634 | QUIT; | |
635 | elt = Fcar (varlist); | |
636 | if (XTYPE (elt) == Lisp_Symbol) | |
637 | specbind (elt, Qnil); | |
08564963 JB |
638 | else if (! NILP (Fcdr (Fcdr (elt)))) |
639 | Fsignal (Qerror, | |
640 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
641 | elt)); | |
db9f0278 JB |
642 | else |
643 | { | |
644 | val = Feval (Fcar (Fcdr (elt))); | |
645 | specbind (Fcar (elt), val); | |
646 | } | |
647 | varlist = Fcdr (varlist); | |
648 | } | |
649 | UNGCPRO; | |
650 | val = Fprogn (Fcdr (args)); | |
651 | return unbind_to (count, val); | |
652 | } | |
653 | ||
654 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
655 | "(let VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ | |
656 | The value of the last form in BODY is returned.\n\ | |
657 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
658 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
659 | All the VALUEFORMs are evalled before any symbols are bound.") | |
660 | (args) | |
661 | Lisp_Object args; | |
662 | { | |
663 | Lisp_Object *temps, tem; | |
664 | register Lisp_Object elt, varlist; | |
665 | int count = specpdl_ptr - specpdl; | |
666 | register int argnum; | |
667 | struct gcpro gcpro1, gcpro2; | |
668 | ||
669 | varlist = Fcar (args); | |
670 | ||
671 | /* Make space to hold the values to give the bound variables */ | |
672 | elt = Flength (varlist); | |
673 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
674 | ||
675 | /* Compute the values and store them in `temps' */ | |
676 | ||
677 | GCPRO2 (args, *temps); | |
678 | gcpro2.nvars = 0; | |
679 | ||
265a9e55 | 680 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
681 | { |
682 | QUIT; | |
683 | elt = Fcar (varlist); | |
684 | if (XTYPE (elt) == Lisp_Symbol) | |
685 | temps [argnum++] = Qnil; | |
08564963 JB |
686 | else if (! NILP (Fcdr (Fcdr (elt)))) |
687 | Fsignal (Qerror, | |
688 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
689 | elt)); | |
db9f0278 JB |
690 | else |
691 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
692 | gcpro2.nvars = argnum; | |
693 | } | |
694 | UNGCPRO; | |
695 | ||
696 | varlist = Fcar (args); | |
265a9e55 | 697 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
698 | { |
699 | elt = Fcar (varlist); | |
700 | tem = temps[argnum++]; | |
701 | if (XTYPE (elt) == Lisp_Symbol) | |
702 | specbind (elt, tem); | |
703 | else | |
704 | specbind (Fcar (elt), tem); | |
705 | } | |
706 | ||
707 | elt = Fprogn (Fcdr (args)); | |
708 | return unbind_to (count, elt); | |
709 | } | |
710 | ||
711 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
712 | "(while TEST BODY...): if TEST yields non-nil, eval BODY... and repeat.\n\ | |
713 | The order of execution is thus TEST, BODY, TEST, BODY and so on\n\ | |
714 | until TEST returns nil.") | |
715 | (args) | |
716 | Lisp_Object args; | |
717 | { | |
718 | Lisp_Object test, body, tem; | |
719 | struct gcpro gcpro1, gcpro2; | |
720 | ||
721 | GCPRO2 (test, body); | |
722 | ||
723 | test = Fcar (args); | |
724 | body = Fcdr (args); | |
265a9e55 | 725 | while (tem = Feval (test), !NILP (tem)) |
db9f0278 JB |
726 | { |
727 | QUIT; | |
728 | Fprogn (body); | |
729 | } | |
730 | ||
731 | UNGCPRO; | |
732 | return Qnil; | |
733 | } | |
734 | ||
735 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
736 | "Return result of expanding macros at top level of FORM.\n\ | |
737 | If FORM is not a macro call, it is returned unchanged.\n\ | |
738 | Otherwise, the macro is expanded and the expansion is considered\n\ | |
739 | in place of FORM. When a non-macro-call results, it is returned.\n\n\ | |
740 | The second optional arg ENVIRONMENT species an environment of macro\n\ | |
741 | definitions to shadow the loaded ones for use in file byte-compilation.") | |
742 | (form, env) | |
743 | register Lisp_Object form; | |
744 | Lisp_Object env; | |
745 | { | |
746 | register Lisp_Object expander, sym, def, tem; | |
747 | ||
748 | while (1) | |
749 | { | |
750 | /* Come back here each time we expand a macro call, | |
751 | in case it expands into another macro call. */ | |
752 | if (XTYPE (form) != Lisp_Cons) | |
753 | break; | |
754 | sym = XCONS (form)->car; | |
755 | /* Detect ((macro lambda ...) ...) */ | |
756 | if (XTYPE (sym) == Lisp_Cons | |
757 | && EQ (XCONS (sym)->car, Qmacro)) | |
758 | { | |
759 | expander = XCONS (sym)->cdr; | |
760 | goto explicit; | |
761 | } | |
762 | if (XTYPE (sym) != Lisp_Symbol) | |
763 | break; | |
764 | /* Trace symbols aliases to other symbols | |
765 | until we get a symbol that is not an alias. */ | |
766 | while (1) | |
767 | { | |
768 | QUIT; | |
769 | tem = Fassq (sym, env); | |
265a9e55 | 770 | if (NILP (tem)) |
db9f0278 JB |
771 | { |
772 | def = XSYMBOL (sym)->function; | |
773 | if (XTYPE (def) == Lisp_Symbol && !EQ (def, Qunbound)) | |
774 | sym = def; | |
775 | else | |
776 | break; | |
777 | } | |
778 | else | |
779 | { | |
780 | #if 0 /* This is turned off because it caused an element (foo . bar) | |
781 | to have the effect of defining foo as an alias for the macro bar. | |
782 | That is inconsistent; bar should be a function to expand foo. */ | |
783 | if (XTYPE (tem) == Lisp_Cons | |
784 | && XTYPE (XCONS (tem)->cdr) == Lisp_Symbol) | |
785 | sym = XCONS (tem)->cdr; | |
786 | else | |
787 | #endif | |
788 | break; | |
789 | } | |
790 | } | |
791 | /* Right now TEM is the result from SYM in ENV, | |
792 | and if TEM is nil then DEF is SYM's function definition. */ | |
265a9e55 | 793 | if (NILP (tem)) |
db9f0278 JB |
794 | { |
795 | /* SYM is not mentioned in ENV. | |
796 | Look at its function definition. */ | |
797 | if (EQ (def, Qunbound) | |
798 | || XTYPE (def) != Lisp_Cons) | |
799 | /* Not defined or definition not suitable */ | |
800 | break; | |
801 | if (EQ (XCONS (def)->car, Qautoload)) | |
802 | { | |
803 | /* Autoloading function: will it be a macro when loaded? */ | |
804 | tem = Fcar (Fnthcdr (make_number (4), def)); | |
265a9e55 | 805 | if (NILP (tem)) |
db9f0278 JB |
806 | break; |
807 | /* Yes, load it and try again. */ | |
808 | do_autoload (def, sym); | |
809 | continue; | |
810 | } | |
811 | else if (!EQ (XCONS (def)->car, Qmacro)) | |
812 | break; | |
813 | else expander = XCONS (def)->cdr; | |
814 | } | |
815 | else | |
816 | { | |
817 | expander = XCONS (tem)->cdr; | |
265a9e55 | 818 | if (NILP (expander)) |
db9f0278 JB |
819 | break; |
820 | } | |
821 | explicit: | |
822 | form = apply1 (expander, XCONS (form)->cdr); | |
823 | } | |
824 | return form; | |
825 | } | |
826 | \f | |
827 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
828 | "(catch TAG BODY...): eval BODY allowing nonlocal exits using `throw'.\n\ | |
829 | TAG is evalled to get the tag to use. Then the BODY is executed.\n\ | |
830 | Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.\n\ | |
831 | If no throw happens, `catch' returns the value of the last BODY form.\n\ | |
832 | If a throw happens, it specifies the value to return from `catch'.") | |
833 | (args) | |
834 | Lisp_Object args; | |
835 | { | |
836 | register Lisp_Object tag; | |
837 | struct gcpro gcpro1; | |
838 | ||
839 | GCPRO1 (args); | |
840 | tag = Feval (Fcar (args)); | |
841 | UNGCPRO; | |
842 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
843 | } | |
844 | ||
845 | /* Set up a catch, then call C function FUNC on argument ARG. | |
846 | FUNC should return a Lisp_Object. | |
847 | This is how catches are done from within C code. */ | |
848 | ||
849 | Lisp_Object | |
850 | internal_catch (tag, func, arg) | |
851 | Lisp_Object tag; | |
852 | Lisp_Object (*func) (); | |
853 | Lisp_Object arg; | |
854 | { | |
855 | /* This structure is made part of the chain `catchlist'. */ | |
856 | struct catchtag c; | |
857 | ||
858 | /* Fill in the components of c, and put it on the list. */ | |
859 | c.next = catchlist; | |
860 | c.tag = tag; | |
861 | c.val = Qnil; | |
862 | c.backlist = backtrace_list; | |
863 | c.handlerlist = handlerlist; | |
864 | c.lisp_eval_depth = lisp_eval_depth; | |
865 | c.pdlcount = specpdl_ptr - specpdl; | |
866 | c.poll_suppress_count = poll_suppress_count; | |
867 | c.gcpro = gcprolist; | |
868 | catchlist = &c; | |
869 | ||
870 | /* Call FUNC. */ | |
871 | if (! _setjmp (c.jmp)) | |
872 | c.val = (*func) (arg); | |
873 | ||
874 | /* Throw works by a longjmp that comes right here. */ | |
875 | catchlist = c.next; | |
876 | return c.val; | |
877 | } | |
878 | ||
879 | /* Discard from the catchlist all catch tags back through CATCH. | |
880 | Before each catch is discarded, unbind all special bindings | |
881 | made within that catch. Also, when discarding a catch that | |
882 | corresponds to a condition handler, discard that handler. | |
883 | ||
884 | At the end, restore some static info saved in CATCH. | |
885 | ||
886 | This is used for correct unwinding in Fthrow and Fsignal, | |
887 | before doing the longjmp that actually destroys the stack frames | |
888 | in which these handlers and catches reside. */ | |
889 | ||
890 | static void | |
891 | unbind_catch (catch) | |
892 | struct catchtag *catch; | |
893 | { | |
894 | register int last_time; | |
895 | ||
896 | do | |
897 | { | |
898 | last_time = catchlist == catch; | |
899 | unbind_to (catchlist->pdlcount, Qnil); | |
900 | handlerlist = catchlist->handlerlist; | |
901 | catchlist = catchlist->next; | |
902 | } | |
903 | while (! last_time); | |
904 | ||
905 | gcprolist = catch->gcpro; | |
906 | backtrace_list = catch->backlist; | |
907 | lisp_eval_depth = catch->lisp_eval_depth; | |
908 | } | |
909 | ||
910 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
911 | "(throw TAG VALUE): throw to the catch for TAG and return VALUE from it.\n\ | |
912 | Both TAG and VALUE are evalled.") | |
913 | (tag, val) | |
914 | register Lisp_Object tag, val; | |
915 | { | |
916 | register struct catchtag *c; | |
917 | ||
918 | while (1) | |
919 | { | |
265a9e55 | 920 | if (!NILP (tag)) |
db9f0278 JB |
921 | for (c = catchlist; c; c = c->next) |
922 | { | |
923 | if (EQ (c->tag, tag)) | |
924 | { | |
925 | /* Restore the polling-suppression count. */ | |
926 | if (c->poll_suppress_count > poll_suppress_count) | |
927 | abort (); | |
928 | while (c->poll_suppress_count < poll_suppress_count) | |
929 | start_polling (); | |
930 | c->val = val; | |
931 | unbind_catch (c); | |
932 | _longjmp (c->jmp, 1); | |
933 | } | |
934 | } | |
935 | tag = Fsignal (Qno_catch, Fcons (tag, Fcons (val, Qnil))); | |
936 | } | |
937 | } | |
938 | ||
939 | ||
940 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
941 | "Do BODYFORM, protecting with UNWINDFORMS.\n\ | |
942 | Usage looks like (unwind-protect BODYFORM UNWINDFORMS...).\n\ | |
943 | If BODYFORM completes normally, its value is returned\n\ | |
944 | after executing the UNWINDFORMS.\n\ | |
945 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.") | |
946 | (args) | |
947 | Lisp_Object args; | |
948 | { | |
949 | Lisp_Object val; | |
950 | int count = specpdl_ptr - specpdl; | |
951 | ||
952 | record_unwind_protect (0, Fcdr (args)); | |
953 | val = Feval (Fcar (args)); | |
954 | return unbind_to (count, val); | |
955 | } | |
956 | \f | |
957 | /* Chain of condition handlers currently in effect. | |
958 | The elements of this chain are contained in the stack frames | |
959 | of Fcondition_case and internal_condition_case. | |
960 | When an error is signaled (by calling Fsignal, below), | |
961 | this chain is searched for an element that applies. */ | |
962 | ||
963 | struct handler *handlerlist; | |
964 | ||
965 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
966 | "Regain control when an error is signaled.\n\ | |
967 | Usage looks like (condition-case VAR BODYFORM HANDLERS...).\n\ | |
968 | executes BODYFORM and returns its value if no error happens.\n\ | |
969 | Each element of HANDLERS looks like (CONDITION-NAME BODY...)\n\ | |
970 | where the BODY is made of Lisp expressions.\n\n\ | |
971 | A handler is applicable to an error\n\ | |
972 | if CONDITION-NAME is one of the error's condition names.\n\ | |
973 | If an error happens, the first applicable handler is run.\n\ | |
974 | \n\ | |
975 | When a handler handles an error,\n\ | |
976 | control returns to the condition-case and the handler BODY... is executed\n\ | |
977 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).\n\ | |
978 | VAR may be nil; then you do not get access to the signal information.\n\ | |
979 | \n\ | |
980 | The value of the last BODY form is returned from the condition-case.\n\ | |
981 | See also the function `signal' for more info.") | |
982 | (args) | |
983 | Lisp_Object args; | |
984 | { | |
985 | Lisp_Object val; | |
986 | struct catchtag c; | |
987 | struct handler h; | |
988 | register Lisp_Object tem; | |
989 | ||
990 | tem = Fcar (args); | |
991 | CHECK_SYMBOL (tem, 0); | |
992 | ||
993 | c.tag = Qnil; | |
994 | c.val = Qnil; | |
995 | c.backlist = backtrace_list; | |
996 | c.handlerlist = handlerlist; | |
997 | c.lisp_eval_depth = lisp_eval_depth; | |
998 | c.pdlcount = specpdl_ptr - specpdl; | |
999 | c.poll_suppress_count = poll_suppress_count; | |
1000 | c.gcpro = gcprolist; | |
1001 | if (_setjmp (c.jmp)) | |
1002 | { | |
265a9e55 | 1003 | if (!NILP (h.var)) |
db9f0278 JB |
1004 | specbind (h.var, Fcdr (c.val)); |
1005 | val = Fprogn (Fcdr (Fcar (c.val))); | |
1006 | unbind_to (c.pdlcount, Qnil); | |
1007 | return val; | |
1008 | } | |
1009 | c.next = catchlist; | |
1010 | catchlist = &c; | |
1011 | h.var = Fcar (args); | |
1012 | h.handler = Fcdr (Fcdr (args)); | |
1013 | ||
265a9e55 | 1014 | for (val = h.handler; ! NILP (val); val = Fcdr (val)) |
db9f0278 JB |
1015 | { |
1016 | tem = Fcar (val); | |
265a9e55 | 1017 | if ((!NILP (tem)) && |
db9f0278 JB |
1018 | (!CONSP (tem) || (XTYPE (XCONS (tem)->car) != Lisp_Symbol))) |
1019 | error ("Invalid condition handler", tem); | |
1020 | } | |
1021 | ||
1022 | h.next = handlerlist; | |
1023 | h.poll_suppress_count = poll_suppress_count; | |
1024 | h.tag = &c; | |
1025 | handlerlist = &h; | |
1026 | ||
1027 | val = Feval (Fcar (Fcdr (args))); | |
1028 | catchlist = c.next; | |
1029 | handlerlist = h.next; | |
1030 | return val; | |
1031 | } | |
1032 | ||
1033 | Lisp_Object | |
1034 | internal_condition_case (bfun, handlers, hfun) | |
1035 | Lisp_Object (*bfun) (); | |
1036 | Lisp_Object handlers; | |
1037 | Lisp_Object (*hfun) (); | |
1038 | { | |
1039 | Lisp_Object val; | |
1040 | struct catchtag c; | |
1041 | struct handler h; | |
1042 | ||
1043 | c.tag = Qnil; | |
1044 | c.val = Qnil; | |
1045 | c.backlist = backtrace_list; | |
1046 | c.handlerlist = handlerlist; | |
1047 | c.lisp_eval_depth = lisp_eval_depth; | |
1048 | c.pdlcount = specpdl_ptr - specpdl; | |
1049 | c.poll_suppress_count = poll_suppress_count; | |
1050 | c.gcpro = gcprolist; | |
1051 | if (_setjmp (c.jmp)) | |
1052 | { | |
1053 | return (*hfun) (Fcdr (c.val)); | |
1054 | } | |
1055 | c.next = catchlist; | |
1056 | catchlist = &c; | |
1057 | h.handler = handlers; | |
1058 | h.var = Qnil; | |
1059 | h.poll_suppress_count = poll_suppress_count; | |
1060 | h.next = handlerlist; | |
1061 | h.tag = &c; | |
1062 | handlerlist = &h; | |
1063 | ||
1064 | val = (*bfun) (); | |
1065 | catchlist = c.next; | |
1066 | handlerlist = h.next; | |
1067 | return val; | |
1068 | } | |
1069 | ||
1070 | static Lisp_Object find_handler_clause (); | |
1071 | ||
1072 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
1073 | "Signal an error. Args are SIGNAL-NAME, and associated DATA.\n\ | |
1074 | This function does not return.\n\n\ | |
1075 | A signal name is a symbol with an `error-conditions' property\n\ | |
1076 | that is a list of condition names.\n\ | |
1077 | A handler for any of those names will get to handle this signal.\n\ | |
1078 | The symbol `error' should normally be one of them.\n\ | |
1079 | \n\ | |
1080 | DATA should be a list. Its elements are printed as part of the error message.\n\ | |
1081 | If the signal is handled, DATA is made available to the handler.\n\ | |
1082 | See also the function `condition-case'.") | |
1083 | (sig, data) | |
1084 | Lisp_Object sig, data; | |
1085 | { | |
1086 | register struct handler *allhandlers = handlerlist; | |
1087 | Lisp_Object conditions; | |
1088 | extern int gc_in_progress; | |
1089 | extern int waiting_for_input; | |
1090 | Lisp_Object debugger_value; | |
1091 | ||
1092 | quit_error_check (); | |
1093 | immediate_quit = 0; | |
1094 | if (gc_in_progress || waiting_for_input) | |
1095 | abort (); | |
1096 | ||
1097 | TOTALLY_UNBLOCK_INPUT; | |
1098 | ||
1099 | conditions = Fget (sig, Qerror_conditions); | |
1100 | ||
1101 | for (; handlerlist; handlerlist = handlerlist->next) | |
1102 | { | |
1103 | register Lisp_Object clause; | |
1104 | clause = find_handler_clause (handlerlist->handler, conditions, | |
1105 | sig, data, &debugger_value); | |
1106 | ||
1107 | #if 0 /* Most callers are not prepared to handle gc if this returns. | |
1108 | So, since this feature is not very useful, take it out. */ | |
1109 | /* If have called debugger and user wants to continue, | |
1110 | just return nil. */ | |
1111 | if (EQ (clause, Qlambda)) | |
1112 | return debugger_value; | |
1113 | #else | |
1114 | if (EQ (clause, Qlambda)) | |
1115 | error ("Returning a value from an error is no longer supported"); | |
1116 | #endif | |
1117 | ||
265a9e55 | 1118 | if (!NILP (clause)) |
db9f0278 JB |
1119 | { |
1120 | struct handler *h = handlerlist; | |
1121 | /* Restore the polling-suppression count. */ | |
1122 | if (h->poll_suppress_count > poll_suppress_count) | |
1123 | abort (); | |
1124 | while (h->poll_suppress_count < poll_suppress_count) | |
1125 | start_polling (); | |
1126 | handlerlist = allhandlers; | |
1127 | unbind_catch (h->tag); | |
1128 | h->tag->val = Fcons (clause, Fcons (sig, data)); | |
1129 | _longjmp (h->tag->jmp, 1); | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | handlerlist = allhandlers; | |
1134 | /* If no handler is present now, try to run the debugger, | |
1135 | and if that fails, throw to top level. */ | |
1136 | find_handler_clause (Qerror, conditions, sig, data, &debugger_value); | |
1137 | Fthrow (Qtop_level, Qt); | |
1138 | } | |
1139 | ||
128c0f66 RM |
1140 | /* Return nonzero iff LIST is a non-nil atom or |
1141 | a list containing one of CONDITIONS. */ | |
1142 | ||
1143 | static int | |
1144 | wants_debugger (list, conditions) | |
1145 | Lisp_Object list, conditions; | |
1146 | { | |
1147 | static int looking = 0; | |
1148 | ||
1149 | if (looking) | |
1150 | { | |
1151 | /* We got an error while looking in LIST. */ | |
1152 | looking = 0; | |
1153 | return 1; | |
1154 | } | |
1155 | ||
4de86b16 | 1156 | if (NILP (list)) |
128c0f66 RM |
1157 | return 0; |
1158 | if (! CONSP (list)) | |
1159 | return 1; | |
1160 | ||
1161 | looking = 1; | |
4de86b16 | 1162 | while (!NILP (conditions)) |
128c0f66 RM |
1163 | { |
1164 | Lisp_Object tem; | |
1165 | tem = Fmemq (XCONS (conditions)->car, list); | |
4de86b16 | 1166 | if (! NILP (tem)) |
128c0f66 RM |
1167 | { |
1168 | looking = 0; | |
1169 | return 1; | |
1170 | } | |
1171 | conditions = XCONS (conditions)->cdr; | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | /* Value of Qlambda means we have called debugger and user has continued. | |
1176 | Store value returned from debugger into *DEBUGGER_VALUE_PTR. */ | |
db9f0278 JB |
1177 | |
1178 | static Lisp_Object | |
1179 | find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr) | |
1180 | Lisp_Object handlers, conditions, sig, data; | |
1181 | Lisp_Object *debugger_value_ptr; | |
1182 | { | |
1183 | register Lisp_Object h; | |
1184 | register Lisp_Object tem; | |
1185 | register Lisp_Object tem1; | |
1186 | ||
1187 | if (EQ (handlers, Qt)) /* t is used by handlers for all conditions, set up by C code. */ | |
1188 | return Qt; | |
1189 | if (EQ (handlers, Qerror)) /* error is used similarly, but means display a backtrace too */ | |
1190 | { | |
128c0f66 | 1191 | if (wants_debugger (Vstack_trace_on_error, conditions)) |
db9f0278 JB |
1192 | internal_with_output_to_temp_buffer ("*Backtrace*", Fbacktrace, Qnil); |
1193 | if (!entering_debugger | |
128c0f66 RM |
1194 | && ((EQ (sig, Qquit) && debug_on_quit) |
1195 | || wants_debugger (Vdebug_on_error, conditions))) | |
db9f0278 JB |
1196 | { |
1197 | int count = specpdl_ptr - specpdl; | |
1198 | specbind (Qdebug_on_error, Qnil); | |
1199 | *debugger_value_ptr = | |
1200 | call_debugger (Fcons (Qerror, | |
1201 | Fcons (Fcons (sig, data), | |
1202 | Qnil))); | |
1203 | return unbind_to (count, Qlambda); | |
1204 | } | |
1205 | return Qt; | |
1206 | } | |
1207 | for (h = handlers; CONSP (h); h = Fcdr (h)) | |
1208 | { | |
1209 | tem1 = Fcar (h); | |
1210 | if (!CONSP (tem1)) | |
1211 | continue; | |
1212 | tem = Fmemq (Fcar (tem1), conditions); | |
265a9e55 | 1213 | if (!NILP (tem)) |
db9f0278 JB |
1214 | return tem1; |
1215 | } | |
1216 | return Qnil; | |
1217 | } | |
1218 | ||
1219 | /* dump an error message; called like printf */ | |
1220 | ||
1221 | /* VARARGS 1 */ | |
1222 | void | |
1223 | error (m, a1, a2, a3) | |
1224 | char *m; | |
1225 | { | |
1226 | char buf[200]; | |
1227 | sprintf (buf, m, a1, a2, a3); | |
1228 | ||
1229 | while (1) | |
1230 | Fsignal (Qerror, Fcons (build_string (buf), Qnil)); | |
1231 | } | |
1232 | \f | |
1233 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 1, 0, | |
1234 | "T if FUNCTION makes provisions for interactive calling.\n\ | |
1235 | This means it contains a description for how to read arguments to give it.\n\ | |
1236 | The value is nil for an invalid function or a symbol with no function\n\ | |
1237 | definition.\n\ | |
1238 | \n\ | |
1239 | Interactively callable functions include strings and vectors (treated\n\ | |
1240 | as keyboard macros), lambda-expressions that contain a top-level call\n\ | |
1241 | to `interactive', autoload definitions made by `autoload' with non-nil\n\ | |
1242 | fourth argument, and some of the built-in functions of Lisp.\n\ | |
1243 | \n\ | |
1244 | Also, a symbol satisfies `commandp' if its function definition does so.") | |
1245 | (function) | |
1246 | Lisp_Object function; | |
1247 | { | |
1248 | register Lisp_Object fun; | |
1249 | register Lisp_Object funcar; | |
1250 | register Lisp_Object tem; | |
1251 | register int i = 0; | |
1252 | ||
1253 | fun = function; | |
1254 | ||
ffd56f97 JB |
1255 | fun = indirect_function (fun); |
1256 | if (EQ (fun, Qunbound)) | |
1257 | return Qnil; | |
db9f0278 JB |
1258 | |
1259 | /* Emacs primitives are interactive if their DEFUN specifies an | |
1260 | interactive spec. */ | |
1261 | if (XTYPE (fun) == Lisp_Subr) | |
1262 | { | |
1263 | if (XSUBR (fun)->prompt) | |
1264 | return Qt; | |
1265 | else | |
1266 | return Qnil; | |
1267 | } | |
1268 | ||
1269 | /* Bytecode objects are interactive if they are long enough to | |
1270 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1271 | where the interactive spec is stored. */ | |
1272 | else if (XTYPE (fun) == Lisp_Compiled) | |
1273 | return (XVECTOR (fun)->size > COMPILED_INTERACTIVE | |
1274 | ? Qt : Qnil); | |
1275 | ||
1276 | /* Strings and vectors are keyboard macros. */ | |
1277 | if (XTYPE (fun) == Lisp_String | |
1278 | || XTYPE (fun) == Lisp_Vector) | |
1279 | return Qt; | |
1280 | ||
1281 | /* Lists may represent commands. */ | |
1282 | if (!CONSP (fun)) | |
1283 | return Qnil; | |
1284 | funcar = Fcar (fun); | |
1285 | if (XTYPE (funcar) != Lisp_Symbol) | |
1286 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1287 | if (EQ (funcar, Qlambda)) | |
1288 | return Fassq (Qinteractive, Fcdr (Fcdr (fun))); | |
1289 | if (EQ (funcar, Qmocklisp)) | |
1290 | return Qt; /* All mocklisp functions can be called interactively */ | |
1291 | if (EQ (funcar, Qautoload)) | |
1292 | return Fcar (Fcdr (Fcdr (Fcdr (fun)))); | |
1293 | else | |
1294 | return Qnil; | |
1295 | } | |
1296 | ||
1297 | /* ARGSUSED */ | |
1298 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, | |
1299 | "Define FUNCTION to autoload from FILE.\n\ | |
1300 | FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\ | |
1301 | Third arg DOCSTRING is documentation for the function.\n\ | |
1302 | Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\ | |
1303 | Fifth arg MACRO if non-nil says the function is really a macro.\n\ | |
1304 | Third through fifth args give info about the real definition.\n\ | |
1305 | They default to nil.\n\ | |
1306 | If FUNCTION is already defined other than as an autoload,\n\ | |
1307 | this does nothing and returns nil.") | |
1308 | (function, file, docstring, interactive, macro) | |
1309 | Lisp_Object function, file, docstring, interactive, macro; | |
1310 | { | |
1311 | #ifdef NO_ARG_ARRAY | |
1312 | Lisp_Object args[4]; | |
1313 | #endif | |
1314 | ||
1315 | CHECK_SYMBOL (function, 0); | |
1316 | CHECK_STRING (file, 1); | |
1317 | ||
1318 | /* If function is defined and not as an autoload, don't override */ | |
1319 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
1320 | && !(XTYPE (XSYMBOL (function)->function) == Lisp_Cons | |
1321 | && EQ (XCONS (XSYMBOL (function)->function)->car, Qautoload))) | |
1322 | return Qnil; | |
1323 | ||
1324 | #ifdef NO_ARG_ARRAY | |
1325 | args[0] = file; | |
1326 | args[1] = docstring; | |
1327 | args[2] = interactive; | |
1328 | args[3] = macro; | |
1329 | ||
1330 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); | |
1331 | #else /* NO_ARG_ARRAY */ | |
1332 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); | |
1333 | #endif /* not NO_ARG_ARRAY */ | |
1334 | } | |
1335 | ||
1336 | Lisp_Object | |
1337 | un_autoload (oldqueue) | |
1338 | Lisp_Object oldqueue; | |
1339 | { | |
1340 | register Lisp_Object queue, first, second; | |
1341 | ||
1342 | /* Queue to unwind is current value of Vautoload_queue. | |
1343 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1344 | queue = Vautoload_queue; | |
1345 | Vautoload_queue = oldqueue; | |
1346 | while (CONSP (queue)) | |
1347 | { | |
1348 | first = Fcar (queue); | |
1349 | second = Fcdr (first); | |
1350 | first = Fcar (first); | |
1351 | if (EQ (second, Qnil)) | |
1352 | Vfeatures = first; | |
1353 | else | |
1354 | Ffset (first, second); | |
1355 | queue = Fcdr (queue); | |
1356 | } | |
1357 | return Qnil; | |
1358 | } | |
1359 | ||
1360 | do_autoload (fundef, funname) | |
1361 | Lisp_Object fundef, funname; | |
1362 | { | |
1363 | int count = specpdl_ptr - specpdl; | |
1364 | Lisp_Object fun, val; | |
1365 | ||
1366 | fun = funname; | |
1367 | CHECK_SYMBOL (funname, 0); | |
1368 | ||
1369 | /* Value saved here is to be restored into Vautoload_queue */ | |
1370 | record_unwind_protect (un_autoload, Vautoload_queue); | |
1371 | Vautoload_queue = Qt; | |
1372 | Fload (Fcar (Fcdr (fundef)), Qnil, noninteractive ? Qt : Qnil, Qnil); | |
1373 | /* Once loading finishes, don't undo it. */ | |
1374 | Vautoload_queue = Qt; | |
1375 | unbind_to (count, Qnil); | |
1376 | ||
ffd56f97 JB |
1377 | fun = Findirect_function (fun); |
1378 | ||
db9f0278 JB |
1379 | if (XTYPE (fun) == Lisp_Cons |
1380 | && EQ (XCONS (fun)->car, Qautoload)) | |
1381 | error ("Autoloading failed to define function %s", | |
1382 | XSYMBOL (funname)->name->data); | |
1383 | } | |
1384 | \f | |
1385 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
1386 | "Evaluate FORM and return its value.") | |
1387 | (form) | |
1388 | Lisp_Object form; | |
1389 | { | |
1390 | Lisp_Object fun, val, original_fun, original_args; | |
1391 | Lisp_Object funcar; | |
1392 | struct backtrace backtrace; | |
1393 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1394 | ||
1395 | if (XTYPE (form) == Lisp_Symbol) | |
1396 | { | |
1397 | if (EQ (Vmocklisp_arguments, Qt)) | |
1398 | return Fsymbol_value (form); | |
1399 | val = Fsymbol_value (form); | |
265a9e55 | 1400 | if (NILP (val)) |
db9f0278 JB |
1401 | XFASTINT (val) = 0; |
1402 | else if (EQ (val, Qt)) | |
1403 | XFASTINT (val) = 1; | |
1404 | return val; | |
1405 | } | |
1406 | if (!CONSP (form)) | |
1407 | return form; | |
1408 | ||
1409 | QUIT; | |
1410 | if (consing_since_gc > gc_cons_threshold) | |
1411 | { | |
1412 | GCPRO1 (form); | |
1413 | Fgarbage_collect (); | |
1414 | UNGCPRO; | |
1415 | } | |
1416 | ||
1417 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1418 | { | |
1419 | if (max_lisp_eval_depth < 100) | |
1420 | max_lisp_eval_depth = 100; | |
1421 | if (lisp_eval_depth > max_lisp_eval_depth) | |
1422 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
1423 | } | |
1424 | ||
1425 | original_fun = Fcar (form); | |
1426 | original_args = Fcdr (form); | |
1427 | ||
1428 | backtrace.next = backtrace_list; | |
1429 | backtrace_list = &backtrace; | |
1430 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
1431 | backtrace.args = &original_args; | |
1432 | backtrace.nargs = UNEVALLED; | |
1433 | backtrace.evalargs = 1; | |
1434 | backtrace.debug_on_exit = 0; | |
1435 | ||
1436 | if (debug_on_next_call) | |
1437 | do_debug_on_call (Qt); | |
1438 | ||
1439 | /* At this point, only original_fun and original_args | |
1440 | have values that will be used below */ | |
1441 | retry: | |
ffd56f97 | 1442 | fun = Findirect_function (original_fun); |
db9f0278 JB |
1443 | |
1444 | if (XTYPE (fun) == Lisp_Subr) | |
1445 | { | |
1446 | Lisp_Object numargs; | |
1447 | Lisp_Object argvals[7]; | |
1448 | Lisp_Object args_left; | |
1449 | register int i, maxargs; | |
1450 | ||
1451 | args_left = original_args; | |
1452 | numargs = Flength (args_left); | |
1453 | ||
1454 | if (XINT (numargs) < XSUBR (fun)->min_args || | |
1455 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
1456 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
1457 | ||
1458 | if (XSUBR (fun)->max_args == UNEVALLED) | |
1459 | { | |
1460 | backtrace.evalargs = 0; | |
1461 | val = (*XSUBR (fun)->function) (args_left); | |
1462 | goto done; | |
1463 | } | |
1464 | ||
1465 | if (XSUBR (fun)->max_args == MANY) | |
1466 | { | |
1467 | /* Pass a vector of evaluated arguments */ | |
1468 | Lisp_Object *vals; | |
1469 | register int argnum = 0; | |
1470 | ||
1471 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
1472 | ||
1473 | GCPRO3 (args_left, fun, fun); | |
1474 | gcpro3.var = vals; | |
1475 | gcpro3.nvars = 0; | |
1476 | ||
265a9e55 | 1477 | while (!NILP (args_left)) |
db9f0278 JB |
1478 | { |
1479 | vals[argnum++] = Feval (Fcar (args_left)); | |
1480 | args_left = Fcdr (args_left); | |
1481 | gcpro3.nvars = argnum; | |
1482 | } | |
db9f0278 JB |
1483 | |
1484 | backtrace.args = vals; | |
1485 | backtrace.nargs = XINT (numargs); | |
1486 | ||
1487 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 1488 | UNGCPRO; |
db9f0278 JB |
1489 | goto done; |
1490 | } | |
1491 | ||
1492 | GCPRO3 (args_left, fun, fun); | |
1493 | gcpro3.var = argvals; | |
1494 | gcpro3.nvars = 0; | |
1495 | ||
1496 | maxargs = XSUBR (fun)->max_args; | |
1497 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
1498 | { | |
1499 | argvals[i] = Feval (Fcar (args_left)); | |
1500 | gcpro3.nvars = ++i; | |
1501 | } | |
1502 | ||
1503 | UNGCPRO; | |
1504 | ||
1505 | backtrace.args = argvals; | |
1506 | backtrace.nargs = XINT (numargs); | |
1507 | ||
1508 | switch (i) | |
1509 | { | |
1510 | case 0: | |
1511 | val = (*XSUBR (fun)->function) (); | |
1512 | goto done; | |
1513 | case 1: | |
1514 | val = (*XSUBR (fun)->function) (argvals[0]); | |
1515 | goto done; | |
1516 | case 2: | |
1517 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
1518 | goto done; | |
1519 | case 3: | |
1520 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1521 | argvals[2]); | |
1522 | goto done; | |
1523 | case 4: | |
1524 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1525 | argvals[2], argvals[3]); | |
1526 | goto done; | |
1527 | case 5: | |
1528 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1529 | argvals[3], argvals[4]); | |
1530 | goto done; | |
1531 | case 6: | |
1532 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1533 | argvals[3], argvals[4], argvals[5]); | |
1534 | goto done; | |
1535 | ||
1536 | default: | |
08564963 JB |
1537 | /* Someone has created a subr that takes more arguments than |
1538 | is supported by this code. We need to either rewrite the | |
1539 | subr to use a different argument protocol, or add more | |
1540 | cases to this switch. */ | |
1541 | abort (); | |
db9f0278 JB |
1542 | } |
1543 | } | |
1544 | if (XTYPE (fun) == Lisp_Compiled) | |
1545 | val = apply_lambda (fun, original_args, 1); | |
1546 | else | |
1547 | { | |
1548 | if (!CONSP (fun)) | |
1549 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1550 | funcar = Fcar (fun); | |
1551 | if (XTYPE (funcar) != Lisp_Symbol) | |
1552 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1553 | if (EQ (funcar, Qautoload)) | |
1554 | { | |
1555 | do_autoload (fun, original_fun); | |
1556 | goto retry; | |
1557 | } | |
1558 | if (EQ (funcar, Qmacro)) | |
1559 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
1560 | else if (EQ (funcar, Qlambda)) | |
1561 | val = apply_lambda (fun, original_args, 1); | |
1562 | else if (EQ (funcar, Qmocklisp)) | |
1563 | val = ml_apply (fun, original_args); | |
1564 | else | |
1565 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1566 | } | |
1567 | done: | |
1568 | if (!EQ (Vmocklisp_arguments, Qt)) | |
1569 | { | |
265a9e55 | 1570 | if (NILP (val)) |
db9f0278 JB |
1571 | XFASTINT (val) = 0; |
1572 | else if (EQ (val, Qt)) | |
1573 | XFASTINT (val) = 1; | |
1574 | } | |
1575 | lisp_eval_depth--; | |
1576 | if (backtrace.debug_on_exit) | |
1577 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
1578 | backtrace_list = backtrace.next; | |
1579 | return val; | |
1580 | } | |
1581 | \f | |
1582 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
1583 | "Call FUNCTION with our remaining args, using our last arg as list of args.\n\ | |
1584 | Thus, (apply '+ 1 2 '(3 4)) returns 10.") | |
1585 | (nargs, args) | |
1586 | int nargs; | |
1587 | Lisp_Object *args; | |
1588 | { | |
1589 | register int i, numargs; | |
1590 | register Lisp_Object spread_arg; | |
1591 | register Lisp_Object *funcall_args; | |
db9f0278 | 1592 | Lisp_Object fun; |
a6e3fa71 | 1593 | struct gcpro gcpro1; |
db9f0278 JB |
1594 | |
1595 | fun = args [0]; | |
1596 | funcall_args = 0; | |
1597 | spread_arg = args [nargs - 1]; | |
1598 | CHECK_LIST (spread_arg, nargs); | |
1599 | ||
1600 | numargs = XINT (Flength (spread_arg)); | |
1601 | ||
1602 | if (numargs == 0) | |
1603 | return Ffuncall (nargs - 1, args); | |
1604 | else if (numargs == 1) | |
1605 | { | |
1606 | args [nargs - 1] = XCONS (spread_arg)->car; | |
1607 | return Ffuncall (nargs, args); | |
1608 | } | |
1609 | ||
a6e3fa71 | 1610 | numargs += nargs - 2; |
db9f0278 | 1611 | |
ffd56f97 JB |
1612 | fun = indirect_function (fun); |
1613 | if (EQ (fun, Qunbound)) | |
db9f0278 | 1614 | { |
ffd56f97 JB |
1615 | /* Let funcall get the error */ |
1616 | fun = args[0]; | |
1617 | goto funcall; | |
db9f0278 JB |
1618 | } |
1619 | ||
1620 | if (XTYPE (fun) == Lisp_Subr) | |
1621 | { | |
1622 | if (numargs < XSUBR (fun)->min_args | |
1623 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
1624 | goto funcall; /* Let funcall get the error */ | |
1625 | else if (XSUBR (fun)->max_args > numargs) | |
1626 | { | |
1627 | /* Avoid making funcall cons up a yet another new vector of arguments | |
1628 | by explicitly supplying nil's for optional values */ | |
1629 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
1630 | * sizeof (Lisp_Object)); | |
1631 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
1632 | funcall_args[++i] = Qnil; | |
a6e3fa71 JB |
1633 | GCPRO1 (*funcall_args); |
1634 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
1635 | } |
1636 | } | |
1637 | funcall: | |
1638 | /* We add 1 to numargs because funcall_args includes the | |
1639 | function itself as well as its arguments. */ | |
1640 | if (!funcall_args) | |
a6e3fa71 JB |
1641 | { |
1642 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
1643 | * sizeof (Lisp_Object)); | |
1644 | GCPRO1 (*funcall_args); | |
1645 | gcpro1.nvars = 1 + numargs; | |
1646 | } | |
1647 | ||
db9f0278 JB |
1648 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
1649 | /* Spread the last arg we got. Its first element goes in | |
1650 | the slot that it used to occupy, hence this value of I. */ | |
1651 | i = nargs - 1; | |
265a9e55 | 1652 | while (!NILP (spread_arg)) |
db9f0278 JB |
1653 | { |
1654 | funcall_args [i++] = XCONS (spread_arg)->car; | |
1655 | spread_arg = XCONS (spread_arg)->cdr; | |
1656 | } | |
a6e3fa71 JB |
1657 | |
1658 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
1659 | } |
1660 | \f | |
1661 | /* Apply fn to arg */ | |
1662 | Lisp_Object | |
1663 | apply1 (fn, arg) | |
1664 | Lisp_Object fn, arg; | |
1665 | { | |
a6e3fa71 JB |
1666 | struct gcpro gcpro1; |
1667 | ||
1668 | GCPRO1 (fn); | |
265a9e55 | 1669 | if (NILP (arg)) |
a6e3fa71 JB |
1670 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
1671 | gcpro1.nvars = 2; | |
db9f0278 JB |
1672 | #ifdef NO_ARG_ARRAY |
1673 | { | |
1674 | Lisp_Object args[2]; | |
1675 | args[0] = fn; | |
1676 | args[1] = arg; | |
a6e3fa71 JB |
1677 | gcpro1.var = args; |
1678 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 JB |
1679 | } |
1680 | #else /* not NO_ARG_ARRAY */ | |
a6e3fa71 | 1681 | RETURN_UNGCPRO (Fapply (2, &fn)); |
db9f0278 JB |
1682 | #endif /* not NO_ARG_ARRAY */ |
1683 | } | |
1684 | ||
1685 | /* Call function fn on no arguments */ | |
1686 | Lisp_Object | |
1687 | call0 (fn) | |
1688 | Lisp_Object fn; | |
1689 | { | |
a6e3fa71 JB |
1690 | struct gcpro gcpro1; |
1691 | ||
1692 | GCPRO1 (fn); | |
1693 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
1694 | } |
1695 | ||
1696 | /* Call function fn with argument arg */ | |
1697 | /* ARGSUSED */ | |
1698 | Lisp_Object | |
1699 | call1 (fn, arg) | |
1700 | Lisp_Object fn, arg; | |
1701 | { | |
a6e3fa71 | 1702 | struct gcpro gcpro1; |
db9f0278 | 1703 | #ifdef NO_ARG_ARRAY |
a6e3fa71 JB |
1704 | Lisp_Object args[2]; |
1705 | ||
db9f0278 JB |
1706 | args[0] = fn; |
1707 | args[1] = arg; | |
a6e3fa71 JB |
1708 | GCPRO1 (args[0]); |
1709 | gcpro1.nvars = 2; | |
1710 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 | 1711 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
1712 | GCPRO1 (fn); |
1713 | gcpro1.nvars = 2; | |
1714 | RETURN_UNGCPRO (Ffuncall (2, &fn)); | |
db9f0278 JB |
1715 | #endif /* not NO_ARG_ARRAY */ |
1716 | } | |
1717 | ||
1718 | /* Call function fn with arguments arg, arg1 */ | |
1719 | /* ARGSUSED */ | |
1720 | Lisp_Object | |
1721 | call2 (fn, arg, arg1) | |
1722 | Lisp_Object fn, arg, arg1; | |
1723 | { | |
a6e3fa71 | 1724 | struct gcpro gcpro1; |
db9f0278 JB |
1725 | #ifdef NO_ARG_ARRAY |
1726 | Lisp_Object args[3]; | |
1727 | args[0] = fn; | |
1728 | args[1] = arg; | |
1729 | args[2] = arg1; | |
a6e3fa71 JB |
1730 | GCPRO1 (args[0]); |
1731 | gcpro1.nvars = 3; | |
1732 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 | 1733 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
1734 | GCPRO1 (fn); |
1735 | gcpro1.nvars = 3; | |
1736 | RETURN_UNGCPRO (Ffuncall (3, &fn)); | |
db9f0278 JB |
1737 | #endif /* not NO_ARG_ARRAY */ |
1738 | } | |
1739 | ||
1740 | /* Call function fn with arguments arg, arg1, arg2 */ | |
1741 | /* ARGSUSED */ | |
1742 | Lisp_Object | |
1743 | call3 (fn, arg, arg1, arg2) | |
1744 | Lisp_Object fn, arg, arg1, arg2; | |
1745 | { | |
a6e3fa71 | 1746 | struct gcpro gcpro1; |
db9f0278 JB |
1747 | #ifdef NO_ARG_ARRAY |
1748 | Lisp_Object args[4]; | |
1749 | args[0] = fn; | |
1750 | args[1] = arg; | |
1751 | args[2] = arg1; | |
1752 | args[3] = arg2; | |
a6e3fa71 JB |
1753 | GCPRO1 (args[0]); |
1754 | gcpro1.nvars = 4; | |
1755 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 | 1756 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
1757 | GCPRO1 (fn); |
1758 | gcpro1.nvars = 4; | |
1759 | RETURN_UNGCPRO (Ffuncall (4, &fn)); | |
db9f0278 JB |
1760 | #endif /* not NO_ARG_ARRAY */ |
1761 | } | |
1762 | ||
1763 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, | |
1764 | "Call first argument as a function, passing remaining arguments to it.\n\ | |
1765 | Thus, (funcall 'cons 'x 'y) returns (x . y).") | |
1766 | (nargs, args) | |
1767 | int nargs; | |
1768 | Lisp_Object *args; | |
1769 | { | |
1770 | Lisp_Object fun; | |
1771 | Lisp_Object funcar; | |
1772 | int numargs = nargs - 1; | |
1773 | Lisp_Object lisp_numargs; | |
1774 | Lisp_Object val; | |
1775 | struct backtrace backtrace; | |
1776 | register Lisp_Object *internal_args; | |
1777 | register int i; | |
1778 | ||
1779 | QUIT; | |
1780 | if (consing_since_gc > gc_cons_threshold) | |
a6e3fa71 | 1781 | Fgarbage_collect (); |
db9f0278 JB |
1782 | |
1783 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1784 | { | |
1785 | if (max_lisp_eval_depth < 100) | |
1786 | max_lisp_eval_depth = 100; | |
1787 | if (lisp_eval_depth > max_lisp_eval_depth) | |
1788 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
1789 | } | |
1790 | ||
1791 | backtrace.next = backtrace_list; | |
1792 | backtrace_list = &backtrace; | |
1793 | backtrace.function = &args[0]; | |
1794 | backtrace.args = &args[1]; | |
1795 | backtrace.nargs = nargs - 1; | |
1796 | backtrace.evalargs = 0; | |
1797 | backtrace.debug_on_exit = 0; | |
1798 | ||
1799 | if (debug_on_next_call) | |
1800 | do_debug_on_call (Qlambda); | |
1801 | ||
1802 | retry: | |
1803 | ||
1804 | fun = args[0]; | |
ffd56f97 JB |
1805 | |
1806 | fun = Findirect_function (fun); | |
db9f0278 JB |
1807 | |
1808 | if (XTYPE (fun) == Lisp_Subr) | |
1809 | { | |
1810 | if (numargs < XSUBR (fun)->min_args | |
1811 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
1812 | { | |
1813 | XFASTINT (lisp_numargs) = numargs; | |
1814 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (lisp_numargs, Qnil))); | |
1815 | } | |
1816 | ||
1817 | if (XSUBR (fun)->max_args == UNEVALLED) | |
1818 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1819 | ||
1820 | if (XSUBR (fun)->max_args == MANY) | |
1821 | { | |
1822 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
1823 | goto done; | |
1824 | } | |
1825 | ||
1826 | if (XSUBR (fun)->max_args > numargs) | |
1827 | { | |
1828 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
1829 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
1830 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
1831 | internal_args[i] = Qnil; | |
1832 | } | |
1833 | else | |
1834 | internal_args = args + 1; | |
1835 | switch (XSUBR (fun)->max_args) | |
1836 | { | |
1837 | case 0: | |
1838 | val = (*XSUBR (fun)->function) (); | |
1839 | goto done; | |
1840 | case 1: | |
1841 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
1842 | goto done; | |
1843 | case 2: | |
1844 | val = (*XSUBR (fun)->function) (internal_args[0], | |
1845 | internal_args[1]); | |
1846 | goto done; | |
1847 | case 3: | |
1848 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
1849 | internal_args[2]); | |
1850 | goto done; | |
1851 | case 4: | |
1852 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
1853 | internal_args[2], | |
1854 | internal_args[3]); | |
1855 | goto done; | |
1856 | case 5: | |
1857 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
1858 | internal_args[2], internal_args[3], | |
1859 | internal_args[4]); | |
1860 | goto done; | |
1861 | case 6: | |
1862 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
1863 | internal_args[2], internal_args[3], | |
1864 | internal_args[4], internal_args[5]); | |
1865 | goto done; | |
1866 | ||
1867 | default: | |
70ee42f7 JB |
1868 | |
1869 | /* If a subr takes more than 6 arguments without using MANY | |
1870 | or UNEVALLED, we need to extend this function to support it. | |
1871 | Until this is done, there is no way to call the function. */ | |
1872 | abort (); | |
db9f0278 JB |
1873 | } |
1874 | } | |
1875 | if (XTYPE (fun) == Lisp_Compiled) | |
1876 | val = funcall_lambda (fun, numargs, args + 1); | |
1877 | else | |
1878 | { | |
1879 | if (!CONSP (fun)) | |
1880 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1881 | funcar = Fcar (fun); | |
1882 | if (XTYPE (funcar) != Lisp_Symbol) | |
1883 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1884 | if (EQ (funcar, Qlambda)) | |
1885 | val = funcall_lambda (fun, numargs, args + 1); | |
1886 | else if (EQ (funcar, Qmocklisp)) | |
1887 | val = ml_apply (fun, Flist (numargs, args + 1)); | |
1888 | else if (EQ (funcar, Qautoload)) | |
1889 | { | |
1890 | do_autoload (fun, args[0]); | |
1891 | goto retry; | |
1892 | } | |
1893 | else | |
1894 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1895 | } | |
1896 | done: | |
1897 | lisp_eval_depth--; | |
1898 | if (backtrace.debug_on_exit) | |
1899 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
1900 | backtrace_list = backtrace.next; | |
1901 | return val; | |
1902 | } | |
1903 | \f | |
1904 | Lisp_Object | |
1905 | apply_lambda (fun, args, eval_flag) | |
1906 | Lisp_Object fun, args; | |
1907 | int eval_flag; | |
1908 | { | |
1909 | Lisp_Object args_left; | |
1910 | Lisp_Object numargs; | |
1911 | register Lisp_Object *arg_vector; | |
1912 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1913 | register int i; | |
1914 | register Lisp_Object tem; | |
1915 | ||
1916 | numargs = Flength (args); | |
1917 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
1918 | args_left = args; | |
1919 | ||
1920 | GCPRO3 (*arg_vector, args_left, fun); | |
1921 | gcpro1.nvars = 0; | |
1922 | ||
1923 | for (i = 0; i < XINT (numargs);) | |
1924 | { | |
1925 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
1926 | if (eval_flag) tem = Feval (tem); | |
1927 | arg_vector[i++] = tem; | |
1928 | gcpro1.nvars = i; | |
1929 | } | |
1930 | ||
1931 | UNGCPRO; | |
1932 | ||
1933 | if (eval_flag) | |
1934 | { | |
1935 | backtrace_list->args = arg_vector; | |
1936 | backtrace_list->nargs = i; | |
1937 | } | |
1938 | backtrace_list->evalargs = 0; | |
1939 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
1940 | ||
1941 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
1942 | if (backtrace_list->debug_on_exit) | |
1943 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
1944 | /* Don't do it again when we return to eval. */ | |
1945 | backtrace_list->debug_on_exit = 0; | |
1946 | return tem; | |
1947 | } | |
1948 | ||
1949 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
1950 | and return the result of evaluation. | |
1951 | FUN must be either a lambda-expression or a compiled-code object. */ | |
1952 | ||
1953 | Lisp_Object | |
1954 | funcall_lambda (fun, nargs, arg_vector) | |
1955 | Lisp_Object fun; | |
1956 | int nargs; | |
1957 | register Lisp_Object *arg_vector; | |
1958 | { | |
1959 | Lisp_Object val, tem; | |
1960 | register Lisp_Object syms_left; | |
1961 | Lisp_Object numargs; | |
1962 | register Lisp_Object next; | |
1963 | int count = specpdl_ptr - specpdl; | |
1964 | register int i; | |
1965 | int optional = 0, rest = 0; | |
1966 | ||
1967 | specbind (Qmocklisp_arguments, Qt); /* t means NOT mocklisp! */ | |
1968 | ||
1969 | XFASTINT (numargs) = nargs; | |
1970 | ||
1971 | if (XTYPE (fun) == Lisp_Cons) | |
1972 | syms_left = Fcar (Fcdr (fun)); | |
1973 | else if (XTYPE (fun) == Lisp_Compiled) | |
1974 | syms_left = XVECTOR (fun)->contents[COMPILED_ARGLIST]; | |
1975 | else abort (); | |
1976 | ||
1977 | i = 0; | |
265a9e55 | 1978 | for (; !NILP (syms_left); syms_left = Fcdr (syms_left)) |
db9f0278 JB |
1979 | { |
1980 | QUIT; | |
1981 | next = Fcar (syms_left); | |
9ffa21d4 JB |
1982 | while (XTYPE (next) != Lisp_Symbol) |
1983 | next = Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
db9f0278 JB |
1984 | if (EQ (next, Qand_rest)) |
1985 | rest = 1; | |
1986 | else if (EQ (next, Qand_optional)) | |
1987 | optional = 1; | |
1988 | else if (rest) | |
1989 | { | |
9ffa21d4 | 1990 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
1991 | i = nargs; |
1992 | } | |
1993 | else if (i < nargs) | |
1994 | { | |
1995 | tem = arg_vector[i++]; | |
1996 | specbind (next, tem); | |
1997 | } | |
1998 | else if (!optional) | |
1999 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
2000 | else | |
2001 | specbind (next, Qnil); | |
2002 | } | |
2003 | ||
2004 | if (i < nargs) | |
2005 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
2006 | ||
2007 | if (XTYPE (fun) == Lisp_Cons) | |
2008 | val = Fprogn (Fcdr (Fcdr (fun))); | |
2009 | else | |
2010 | val = Fbyte_code (XVECTOR (fun)->contents[COMPILED_BYTECODE], | |
2011 | XVECTOR (fun)->contents[COMPILED_CONSTANTS], | |
2012 | XVECTOR (fun)->contents[COMPILED_STACK_DEPTH]); | |
2013 | return unbind_to (count, val); | |
2014 | } | |
2015 | \f | |
2016 | void | |
2017 | grow_specpdl () | |
2018 | { | |
2019 | register int count = specpdl_ptr - specpdl; | |
2020 | if (specpdl_size >= max_specpdl_size) | |
2021 | { | |
2022 | if (max_specpdl_size < 400) | |
2023 | max_specpdl_size = 400; | |
2024 | if (specpdl_size >= max_specpdl_size) | |
2025 | { | |
2026 | Fsignal (Qerror, | |
2027 | Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil)); | |
2028 | max_specpdl_size *= 2; | |
2029 | } | |
2030 | } | |
2031 | specpdl_size *= 2; | |
2032 | if (specpdl_size > max_specpdl_size) | |
2033 | specpdl_size = max_specpdl_size; | |
2034 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
2035 | specpdl_ptr = specpdl + count; | |
2036 | } | |
2037 | ||
2038 | void | |
2039 | specbind (symbol, value) | |
2040 | Lisp_Object symbol, value; | |
2041 | { | |
2042 | extern void store_symval_forwarding (); /* in eval.c */ | |
2043 | Lisp_Object ovalue; | |
2044 | ||
9ffa21d4 JB |
2045 | CHECK_SYMBOL (symbol, 0); |
2046 | ||
db9f0278 JB |
2047 | if (specpdl_ptr == specpdl + specpdl_size) |
2048 | grow_specpdl (); | |
2049 | specpdl_ptr->symbol = symbol; | |
2050 | specpdl_ptr->func = 0; | |
2051 | ovalue = XSYMBOL (symbol)->value; | |
2052 | specpdl_ptr->old_value = EQ (ovalue, Qunbound) ? Qunbound : Fsymbol_value (symbol); | |
2053 | specpdl_ptr++; | |
2054 | if (XTYPE (ovalue) == Lisp_Buffer_Objfwd) | |
2055 | store_symval_forwarding (symbol, ovalue, value); | |
2056 | else | |
2057 | Fset (symbol, value); | |
2058 | } | |
2059 | ||
2060 | void | |
2061 | record_unwind_protect (function, arg) | |
2062 | Lisp_Object (*function)(); | |
2063 | Lisp_Object arg; | |
2064 | { | |
2065 | if (specpdl_ptr == specpdl + specpdl_size) | |
2066 | grow_specpdl (); | |
2067 | specpdl_ptr->func = function; | |
2068 | specpdl_ptr->symbol = Qnil; | |
2069 | specpdl_ptr->old_value = arg; | |
2070 | specpdl_ptr++; | |
2071 | } | |
2072 | ||
2073 | Lisp_Object | |
2074 | unbind_to (count, value) | |
2075 | int count; | |
2076 | Lisp_Object value; | |
2077 | { | |
265a9e55 | 2078 | int quitf = !NILP (Vquit_flag); |
db9f0278 JB |
2079 | struct gcpro gcpro1; |
2080 | ||
2081 | GCPRO1 (value); | |
2082 | ||
2083 | Vquit_flag = Qnil; | |
2084 | ||
2085 | while (specpdl_ptr != specpdl + count) | |
2086 | { | |
2087 | --specpdl_ptr; | |
2088 | if (specpdl_ptr->func != 0) | |
2089 | (*specpdl_ptr->func) (specpdl_ptr->old_value); | |
2090 | /* Note that a "binding" of nil is really an unwind protect, | |
2091 | so in that case the "old value" is a list of forms to evaluate. */ | |
265a9e55 | 2092 | else if (NILP (specpdl_ptr->symbol)) |
db9f0278 JB |
2093 | Fprogn (specpdl_ptr->old_value); |
2094 | else | |
2095 | Fset (specpdl_ptr->symbol, specpdl_ptr->old_value); | |
2096 | } | |
265a9e55 | 2097 | if (NILP (Vquit_flag) && quitf) Vquit_flag = Qt; |
db9f0278 JB |
2098 | |
2099 | UNGCPRO; | |
2100 | ||
2101 | return value; | |
2102 | } | |
2103 | \f | |
2104 | #if 0 | |
2105 | ||
2106 | /* Get the value of symbol's global binding, even if that binding | |
2107 | is not now dynamically visible. */ | |
2108 | ||
2109 | Lisp_Object | |
2110 | top_level_value (symbol) | |
2111 | Lisp_Object symbol; | |
2112 | { | |
2113 | register struct specbinding *ptr = specpdl; | |
2114 | ||
2115 | CHECK_SYMBOL (symbol, 0); | |
2116 | for (; ptr != specpdl_ptr; ptr++) | |
2117 | { | |
2118 | if (EQ (ptr->symbol, symbol)) | |
2119 | return ptr->old_value; | |
2120 | } | |
2121 | return Fsymbol_value (symbol); | |
2122 | } | |
2123 | ||
2124 | Lisp_Object | |
2125 | top_level_set (symbol, newval) | |
2126 | Lisp_Object symbol, newval; | |
2127 | { | |
2128 | register struct specbinding *ptr = specpdl; | |
2129 | ||
2130 | CHECK_SYMBOL (symbol, 0); | |
2131 | for (; ptr != specpdl_ptr; ptr++) | |
2132 | { | |
2133 | if (EQ (ptr->symbol, symbol)) | |
2134 | { | |
2135 | ptr->old_value = newval; | |
2136 | return newval; | |
2137 | } | |
2138 | } | |
2139 | return Fset (symbol, newval); | |
2140 | } | |
2141 | ||
2142 | #endif /* 0 */ | |
2143 | \f | |
2144 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, | |
2145 | "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\ | |
2146 | The debugger is entered when that frame exits, if the flag is non-nil.") | |
2147 | (level, flag) | |
2148 | Lisp_Object level, flag; | |
2149 | { | |
2150 | register struct backtrace *backlist = backtrace_list; | |
2151 | register int i; | |
2152 | ||
2153 | CHECK_NUMBER (level, 0); | |
2154 | ||
2155 | for (i = 0; backlist && i < XINT (level); i++) | |
2156 | { | |
2157 | backlist = backlist->next; | |
2158 | } | |
2159 | ||
2160 | if (backlist) | |
265a9e55 | 2161 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
2162 | |
2163 | return flag; | |
2164 | } | |
2165 | ||
2166 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
2167 | "Print a trace of Lisp function calls currently active.\n\ | |
2168 | Output stream used is value of `standard-output'.") | |
2169 | () | |
2170 | { | |
2171 | register struct backtrace *backlist = backtrace_list; | |
2172 | register int i; | |
2173 | Lisp_Object tail; | |
2174 | Lisp_Object tem; | |
2175 | extern Lisp_Object Vprint_level; | |
2176 | struct gcpro gcpro1; | |
2177 | ||
2178 | entering_debugger = 0; | |
2179 | ||
2180 | XFASTINT (Vprint_level) = 3; | |
2181 | ||
2182 | tail = Qnil; | |
2183 | GCPRO1 (tail); | |
2184 | ||
2185 | while (backlist) | |
2186 | { | |
2187 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
2188 | if (backlist->nargs == UNEVALLED) | |
2189 | { | |
2190 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
2191 | } | |
2192 | else | |
2193 | { | |
2194 | tem = *backlist->function; | |
2195 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
2196 | write_string ("(", -1); | |
2197 | if (backlist->nargs == MANY) | |
2198 | { | |
2199 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 2200 | !NILP (tail); |
db9f0278 JB |
2201 | tail = Fcdr (tail), i++) |
2202 | { | |
2203 | if (i) write_string (" ", -1); | |
2204 | Fprin1 (Fcar (tail), Qnil); | |
2205 | } | |
2206 | } | |
2207 | else | |
2208 | { | |
2209 | for (i = 0; i < backlist->nargs; i++) | |
2210 | { | |
2211 | if (i) write_string (" ", -1); | |
2212 | Fprin1 (backlist->args[i], Qnil); | |
2213 | } | |
2214 | } | |
2215 | } | |
2216 | write_string (")\n", -1); | |
2217 | backlist = backlist->next; | |
2218 | } | |
2219 | ||
2220 | Vprint_level = Qnil; | |
2221 | UNGCPRO; | |
2222 | return Qnil; | |
2223 | } | |
2224 | ||
2225 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, "", | |
2226 | "Return the function and arguments N frames up from current execution point.\n\ | |
2227 | If that frame has not evaluated the arguments yet (or is a special form),\n\ | |
2228 | the value is (nil FUNCTION ARG-FORMS...).\n\ | |
2229 | If that frame has evaluated its arguments and called its function already,\n\ | |
2230 | the value is (t FUNCTION ARG-VALUES...).\n\ | |
2231 | A &rest arg is represented as the tail of the list ARG-VALUES.\n\ | |
2232 | FUNCTION is whatever was supplied as car of evaluated list,\n\ | |
2233 | or a lambda expression for macro calls.\n\ | |
2234 | If N is more than the number of frames, the value is nil.") | |
2235 | (nframes) | |
2236 | Lisp_Object nframes; | |
2237 | { | |
2238 | register struct backtrace *backlist = backtrace_list; | |
2239 | register int i; | |
2240 | Lisp_Object tem; | |
2241 | ||
2242 | CHECK_NATNUM (nframes, 0); | |
2243 | ||
2244 | /* Find the frame requested. */ | |
2245 | for (i = 0; i < XFASTINT (nframes); i++) | |
2246 | backlist = backlist->next; | |
2247 | ||
2248 | if (!backlist) | |
2249 | return Qnil; | |
2250 | if (backlist->nargs == UNEVALLED) | |
2251 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
2252 | else | |
2253 | { | |
2254 | if (backlist->nargs == MANY) | |
2255 | tem = *backlist->args; | |
2256 | else | |
2257 | tem = Flist (backlist->nargs, backlist->args); | |
2258 | ||
2259 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
2260 | } | |
2261 | } | |
2262 | \f | |
2263 | syms_of_eval () | |
2264 | { | |
2265 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
2266 | "Limit on number of Lisp variable bindings & unwind-protects before error."); | |
2267 | ||
2268 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
2269 | "Limit on depth in `eval', `apply' and `funcall' before error.\n\ | |
2270 | This limit is to catch infinite recursions for you before they cause\n\ | |
2271 | actual stack overflow in C, which would be fatal for Emacs.\n\ | |
2272 | You can safely make it considerably larger than its default value,\n\ | |
2273 | if that proves inconveniently small."); | |
2274 | ||
2275 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
2276 | "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\ | |
2277 | Typing C-G sets `quit-flag' non-nil, regardless of `inhibit-quit'."); | |
2278 | Vquit_flag = Qnil; | |
2279 | ||
2280 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
2281 | "Non-nil inhibits C-g quitting from happening immediately.\n\ | |
2282 | Note that `quit-flag' will still be set by typing C-g,\n\ | |
2283 | so a quit will be signalled as soon as `inhibit-quit' is nil.\n\ | |
2284 | To prevent this happening, set `quit-flag' to nil\n\ | |
2285 | before making `inhibit-quit' nil."); | |
2286 | Vinhibit_quit = Qnil; | |
2287 | ||
ad236261 JB |
2288 | Qinhibit_quit = intern ("inhibit-quit"); |
2289 | staticpro (&Qinhibit_quit); | |
2290 | ||
db9f0278 JB |
2291 | Qautoload = intern ("autoload"); |
2292 | staticpro (&Qautoload); | |
2293 | ||
2294 | Qdebug_on_error = intern ("debug-on-error"); | |
2295 | staticpro (&Qdebug_on_error); | |
2296 | ||
2297 | Qmacro = intern ("macro"); | |
2298 | staticpro (&Qmacro); | |
2299 | ||
2300 | /* Note that the process handling also uses Qexit, but we don't want | |
2301 | to staticpro it twice, so we just do it here. */ | |
2302 | Qexit = intern ("exit"); | |
2303 | staticpro (&Qexit); | |
2304 | ||
2305 | Qinteractive = intern ("interactive"); | |
2306 | staticpro (&Qinteractive); | |
2307 | ||
2308 | Qcommandp = intern ("commandp"); | |
2309 | staticpro (&Qcommandp); | |
2310 | ||
2311 | Qdefun = intern ("defun"); | |
2312 | staticpro (&Qdefun); | |
2313 | ||
2314 | Qand_rest = intern ("&rest"); | |
2315 | staticpro (&Qand_rest); | |
2316 | ||
2317 | Qand_optional = intern ("&optional"); | |
2318 | staticpro (&Qand_optional); | |
2319 | ||
128c0f66 | 2320 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
db9f0278 | 2321 | "*Non-nil means automatically display a backtrace buffer\n\ |
128c0f66 RM |
2322 | after any error that is handled by the editor command loop.\n\ |
2323 | If the value is a list, an error only means to display a backtrace\n\ | |
2324 | if one of its condition symbols appears in the list."); | |
2325 | Vstack_trace_on_error = Qnil; | |
db9f0278 | 2326 | |
128c0f66 | 2327 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
db9f0278 JB |
2328 | "*Non-nil means enter debugger if an error is signaled.\n\ |
2329 | Does not apply to errors handled by `condition-case'.\n\ | |
128c0f66 RM |
2330 | If the value is a list, an error only means to enter the debugger\n\ |
2331 | if one of its condition symbols appears in the list.\n\ | |
db9f0278 | 2332 | See also variable `debug-on-quit'."); |
128c0f66 | 2333 | Vdebug_on_error = Qnil; |
db9f0278 JB |
2334 | |
2335 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, | |
2336 | "*Non-nil means enter debugger if quit is signaled (C-G, for example).\n\ | |
daa37602 JB |
2337 | Does not apply if quit is handled by a `condition-case'.\n\ |
2338 | A non-nil value is equivalent to a `debug-on-error' value containing `quit'."); | |
db9f0278 JB |
2339 | debug_on_quit = 0; |
2340 | ||
2341 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
2342 | "Non-nil means enter debugger before next `eval', `apply' or `funcall'."); | |
2343 | ||
2344 | DEFVAR_LISP ("debugger", &Vdebugger, | |
2345 | "Function to call to invoke debugger.\n\ | |
2346 | If due to frame exit, args are `exit' and the value being returned;\n\ | |
2347 | this function's value will be returned instead of that.\n\ | |
2348 | If due to error, args are `error' and a list of the args to `signal'.\n\ | |
2349 | If due to `apply' or `funcall' entry, one arg, `lambda'.\n\ | |
2350 | If due to `eval' entry, one arg, t."); | |
2351 | Vdebugger = Qnil; | |
2352 | ||
2353 | Qmocklisp_arguments = intern ("mocklisp-arguments"); | |
2354 | staticpro (&Qmocklisp_arguments); | |
2355 | DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments, | |
2356 | "While in a mocklisp function, the list of its unevaluated args."); | |
2357 | Vmocklisp_arguments = Qt; | |
2358 | ||
2359 | DEFVAR_LISP ("run-hooks", &Vrun_hooks, | |
2360 | "Set to the function `run-hooks', if that function has been defined.\n\ | |
2361 | Otherwise, nil (in a bare Emacs without preloaded Lisp code)."); | |
2362 | Vrun_hooks = Qnil; | |
2363 | ||
2364 | staticpro (&Vautoload_queue); | |
2365 | Vautoload_queue = Qnil; | |
2366 | ||
2367 | defsubr (&Sor); | |
2368 | defsubr (&Sand); | |
2369 | defsubr (&Sif); | |
2370 | defsubr (&Scond); | |
2371 | defsubr (&Sprogn); | |
2372 | defsubr (&Sprog1); | |
2373 | defsubr (&Sprog2); | |
2374 | defsubr (&Ssetq); | |
2375 | defsubr (&Squote); | |
2376 | defsubr (&Sfunction); | |
2377 | defsubr (&Sdefun); | |
2378 | defsubr (&Sdefmacro); | |
2379 | defsubr (&Sdefvar); | |
2380 | defsubr (&Sdefconst); | |
2381 | defsubr (&Suser_variable_p); | |
2382 | defsubr (&Slet); | |
2383 | defsubr (&SletX); | |
2384 | defsubr (&Swhile); | |
2385 | defsubr (&Smacroexpand); | |
2386 | defsubr (&Scatch); | |
2387 | defsubr (&Sthrow); | |
2388 | defsubr (&Sunwind_protect); | |
2389 | defsubr (&Scondition_case); | |
2390 | defsubr (&Ssignal); | |
2391 | defsubr (&Sinteractive_p); | |
2392 | defsubr (&Scommandp); | |
2393 | defsubr (&Sautoload); | |
2394 | defsubr (&Seval); | |
2395 | defsubr (&Sapply); | |
2396 | defsubr (&Sfuncall); | |
2397 | defsubr (&Sbacktrace_debug); | |
2398 | defsubr (&Sbacktrace); | |
2399 | defsubr (&Sbacktrace_frame); | |
2400 | } |