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