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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" | |
9ac0d9e0 | 23 | #include "blockinput.h" |
db9f0278 JB |
24 | |
25 | #ifndef standalone | |
26 | #include "commands.h" | |
1f98fa48 | 27 | #include "keyboard.h" |
db9f0278 JB |
28 | #else |
29 | #define INTERACTIVE 1 | |
30 | #endif | |
31 | ||
32 | #include <setjmp.h> | |
33 | ||
34 | /* This definition is duplicated in alloc.c and keyboard.c */ | |
35 | /* Putting it in lisp.h makes cc bomb out! */ | |
36 | ||
37 | struct backtrace | |
38 | { | |
39 | struct backtrace *next; | |
40 | Lisp_Object *function; | |
41 | Lisp_Object *args; /* Points to vector of args. */ | |
daa37602 JB |
42 | int nargs; /* Length of vector. |
43 | If nargs is UNEVALLED, args points to slot holding | |
44 | list of unevalled args */ | |
db9f0278 JB |
45 | char evalargs; |
46 | /* Nonzero means call value of debugger when done with this operation. */ | |
47 | char debug_on_exit; | |
48 | }; | |
49 | ||
50 | struct backtrace *backtrace_list; | |
51 | ||
82da7701 JB |
52 | /* This structure helps implement the `catch' and `throw' control |
53 | structure. A struct catchtag contains all the information needed | |
54 | to restore the state of the interpreter after a non-local jump. | |
55 | ||
56 | Handlers for error conditions (represented by `struct handler' | |
57 | structures) just point to a catch tag to do the cleanup required | |
58 | for their jumps. | |
59 | ||
60 | catchtag structures are chained together in the C calling stack; | |
61 | the `next' member points to the next outer catchtag. | |
62 | ||
63 | A call like (throw TAG VAL) searches for a catchtag whose `tag' | |
64 | member is TAG, and then unbinds to it. The `val' member is used to | |
65 | hold VAL while the stack is unwound; `val' is returned as the value | |
66 | of the catch form. | |
67 | ||
68 | All the other members are concerned with restoring the interpreter | |
69 | state. */ | |
db9f0278 JB |
70 | struct catchtag |
71 | { | |
72 | Lisp_Object tag; | |
73 | Lisp_Object val; | |
74 | struct catchtag *next; | |
75 | struct gcpro *gcpro; | |
76 | jmp_buf jmp; | |
77 | struct backtrace *backlist; | |
78 | struct handler *handlerlist; | |
79 | int lisp_eval_depth; | |
80 | int pdlcount; | |
81 | int poll_suppress_count; | |
82 | }; | |
83 | ||
84 | struct catchtag *catchlist; | |
85 | ||
86 | Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun; | |
ad236261 | 87 | Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag; |
db9f0278 JB |
88 | Lisp_Object Qmocklisp_arguments, Vmocklisp_arguments, Qmocklisp; |
89 | Lisp_Object Qand_rest, Qand_optional; | |
90 | Lisp_Object Qdebug_on_error; | |
91 | ||
92 | Lisp_Object Vrun_hooks; | |
93 | ||
94 | /* Non-nil means record all fset's and provide's, to be undone | |
95 | if the file being autoloaded is not fully loaded. | |
96 | They are recorded by being consed onto the front of Vautoload_queue: | |
97 | (FUN . ODEF) for a defun, (OFEATURES . nil) for a provide. */ | |
98 | ||
99 | Lisp_Object Vautoload_queue; | |
100 | ||
101 | /* Current number of specbindings allocated in specpdl. */ | |
102 | int specpdl_size; | |
103 | ||
104 | /* Pointer to beginning of specpdl. */ | |
105 | struct specbinding *specpdl; | |
106 | ||
107 | /* Pointer to first unused element in specpdl. */ | |
108 | struct specbinding *specpdl_ptr; | |
109 | ||
110 | /* Maximum size allowed for specpdl allocation */ | |
111 | int max_specpdl_size; | |
112 | ||
113 | /* Depth in Lisp evaluations and function calls. */ | |
114 | int lisp_eval_depth; | |
115 | ||
116 | /* Maximum allowed depth in Lisp evaluations and function calls. */ | |
117 | int max_lisp_eval_depth; | |
118 | ||
119 | /* Nonzero means enter debugger before next function call */ | |
120 | int debug_on_next_call; | |
121 | ||
128c0f66 | 122 | /* List of conditions (non-nil atom means all) which cause a backtrace |
4de86b16 | 123 | if an error is handled by the command loop's error handler. */ |
128c0f66 | 124 | Lisp_Object Vstack_trace_on_error; |
db9f0278 | 125 | |
128c0f66 | 126 | /* List of conditions (non-nil atom means all) which enter the debugger |
4de86b16 | 127 | if an error is handled by the command loop's error handler. */ |
128c0f66 | 128 | Lisp_Object Vdebug_on_error; |
db9f0278 JB |
129 | |
130 | /* Nonzero means enter debugger if a quit signal | |
128c0f66 | 131 | is handled by the command loop's error handler. */ |
db9f0278 JB |
132 | int debug_on_quit; |
133 | ||
82da7701 JB |
134 | /* The value of num_nonmacro_input_chars as of the last time we |
135 | started to enter the debugger. If we decide to enter the debugger | |
136 | again when this is still equal to num_nonmacro_input_chars, then we | |
137 | know that the debugger itself has an error, and we should just | |
138 | signal the error instead of entering an infinite loop of debugger | |
139 | invocations. */ | |
140 | int when_entered_debugger; | |
db9f0278 JB |
141 | |
142 | Lisp_Object Vdebugger; | |
143 | ||
144 | void specbind (), record_unwind_protect (); | |
145 | ||
146 | Lisp_Object funcall_lambda (); | |
147 | extern Lisp_Object ml_apply (); /* Apply a mocklisp function to unevaluated argument list */ | |
148 | ||
149 | init_eval_once () | |
150 | { | |
151 | specpdl_size = 50; | |
152 | specpdl = (struct specbinding *) malloc (specpdl_size * sizeof (struct specbinding)); | |
153 | max_specpdl_size = 600; | |
154 | max_lisp_eval_depth = 200; | |
155 | } | |
156 | ||
157 | init_eval () | |
158 | { | |
159 | specpdl_ptr = specpdl; | |
160 | catchlist = 0; | |
161 | handlerlist = 0; | |
162 | backtrace_list = 0; | |
163 | Vquit_flag = Qnil; | |
164 | debug_on_next_call = 0; | |
165 | lisp_eval_depth = 0; | |
82da7701 | 166 | when_entered_debugger = 0; |
db9f0278 JB |
167 | } |
168 | ||
169 | Lisp_Object | |
170 | call_debugger (arg) | |
171 | Lisp_Object arg; | |
172 | { | |
173 | if (lisp_eval_depth + 20 > max_lisp_eval_depth) | |
174 | max_lisp_eval_depth = lisp_eval_depth + 20; | |
175 | if (specpdl_size + 40 > max_specpdl_size) | |
176 | max_specpdl_size = specpdl_size + 40; | |
177 | debug_on_next_call = 0; | |
82da7701 | 178 | when_entered_debugger = num_nonmacro_input_chars; |
db9f0278 JB |
179 | return apply1 (Vdebugger, arg); |
180 | } | |
181 | ||
182 | do_debug_on_call (code) | |
183 | Lisp_Object code; | |
184 | { | |
185 | debug_on_next_call = 0; | |
186 | backtrace_list->debug_on_exit = 1; | |
187 | call_debugger (Fcons (code, Qnil)); | |
188 | } | |
189 | \f | |
190 | /* NOTE!!! Every function that can call EVAL must protect its args | |
191 | and temporaries from garbage collection while it needs them. | |
192 | The definition of `For' shows what you have to do. */ | |
193 | ||
194 | DEFUN ("or", For, Sor, 0, UNEVALLED, 0, | |
195 | "Eval args until one of them yields non-nil, then return that value.\n\ | |
196 | The remaining args are not evalled at all.\n\ | |
197 | If all args return nil, return nil.") | |
198 | (args) | |
199 | Lisp_Object args; | |
200 | { | |
201 | register Lisp_Object val; | |
202 | Lisp_Object args_left; | |
203 | struct gcpro gcpro1; | |
204 | ||
265a9e55 | 205 | if (NILP(args)) |
db9f0278 JB |
206 | return Qnil; |
207 | ||
208 | args_left = args; | |
209 | GCPRO1 (args_left); | |
210 | ||
211 | do | |
212 | { | |
213 | val = Feval (Fcar (args_left)); | |
265a9e55 | 214 | if (!NILP (val)) |
db9f0278 JB |
215 | break; |
216 | args_left = Fcdr (args_left); | |
217 | } | |
265a9e55 | 218 | while (!NILP(args_left)); |
db9f0278 JB |
219 | |
220 | UNGCPRO; | |
221 | return val; | |
222 | } | |
223 | ||
224 | DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0, | |
225 | "Eval args until one of them yields nil, then return nil.\n\ | |
226 | The remaining args are not evalled at all.\n\ | |
227 | If no arg yields nil, return the last arg's value.") | |
228 | (args) | |
229 | Lisp_Object args; | |
230 | { | |
231 | register Lisp_Object val; | |
232 | Lisp_Object args_left; | |
233 | struct gcpro gcpro1; | |
234 | ||
265a9e55 | 235 | if (NILP(args)) |
db9f0278 JB |
236 | return Qt; |
237 | ||
238 | args_left = args; | |
239 | GCPRO1 (args_left); | |
240 | ||
241 | do | |
242 | { | |
243 | val = Feval (Fcar (args_left)); | |
265a9e55 | 244 | if (NILP (val)) |
db9f0278 JB |
245 | break; |
246 | args_left = Fcdr (args_left); | |
247 | } | |
265a9e55 | 248 | while (!NILP(args_left)); |
db9f0278 JB |
249 | |
250 | UNGCPRO; | |
251 | return val; | |
252 | } | |
253 | ||
254 | DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0, | |
255 | "(if COND THEN ELSE...): if COND yields non-nil, do THEN, else do ELSE...\n\ | |
256 | Returns the value of THEN or the value of the last of the ELSE's.\n\ | |
257 | THEN must be one expression, but ELSE... can be zero or more expressions.\n\ | |
258 | If COND yields nil, and there are no ELSE's, the value is nil.") | |
259 | (args) | |
260 | Lisp_Object args; | |
261 | { | |
262 | register Lisp_Object cond; | |
263 | struct gcpro gcpro1; | |
264 | ||
265 | GCPRO1 (args); | |
266 | cond = Feval (Fcar (args)); | |
267 | UNGCPRO; | |
268 | ||
265a9e55 | 269 | if (!NILP (cond)) |
db9f0278 JB |
270 | return Feval (Fcar (Fcdr (args))); |
271 | return Fprogn (Fcdr (Fcdr (args))); | |
272 | } | |
273 | ||
274 | DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0, | |
275 | "(cond CLAUSES...): try each clause until one succeeds.\n\ | |
276 | Each clause looks like (CONDITION BODY...). CONDITION is evaluated\n\ | |
277 | and, if the value is non-nil, this clause succeeds:\n\ | |
278 | then the expressions in BODY are evaluated and the last one's\n\ | |
279 | value is the value of the cond-form.\n\ | |
280 | If no clause succeeds, cond returns nil.\n\ | |
281 | If a clause has one element, as in (CONDITION),\n\ | |
282 | CONDITION's value if non-nil is returned from the cond-form.") | |
283 | (args) | |
284 | Lisp_Object args; | |
285 | { | |
286 | register Lisp_Object clause, val; | |
287 | struct gcpro gcpro1; | |
288 | ||
289 | val = Qnil; | |
290 | GCPRO1 (args); | |
265a9e55 | 291 | while (!NILP (args)) |
db9f0278 JB |
292 | { |
293 | clause = Fcar (args); | |
294 | val = Feval (Fcar (clause)); | |
265a9e55 | 295 | if (!NILP (val)) |
db9f0278 JB |
296 | { |
297 | if (!EQ (XCONS (clause)->cdr, Qnil)) | |
298 | val = Fprogn (XCONS (clause)->cdr); | |
299 | break; | |
300 | } | |
301 | args = XCONS (args)->cdr; | |
302 | } | |
303 | UNGCPRO; | |
304 | ||
305 | return val; | |
306 | } | |
307 | ||
308 | DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0, | |
309 | "(progn BODY...): eval BODY forms sequentially and return value of last one.") | |
310 | (args) | |
311 | Lisp_Object args; | |
312 | { | |
313 | register Lisp_Object val, tem; | |
314 | Lisp_Object args_left; | |
315 | struct gcpro gcpro1; | |
316 | ||
317 | /* In Mocklisp code, symbols at the front of the progn arglist | |
318 | are to be bound to zero. */ | |
319 | if (!EQ (Vmocklisp_arguments, Qt)) | |
320 | { | |
321 | val = make_number (0); | |
265a9e55 | 322 | while (!NILP (args) && (tem = Fcar (args), XTYPE (tem) == Lisp_Symbol)) |
db9f0278 JB |
323 | { |
324 | QUIT; | |
325 | specbind (tem, val), args = Fcdr (args); | |
326 | } | |
327 | } | |
328 | ||
265a9e55 | 329 | if (NILP(args)) |
db9f0278 JB |
330 | return Qnil; |
331 | ||
332 | args_left = args; | |
333 | GCPRO1 (args_left); | |
334 | ||
335 | do | |
336 | { | |
337 | val = Feval (Fcar (args_left)); | |
338 | args_left = Fcdr (args_left); | |
339 | } | |
265a9e55 | 340 | while (!NILP(args_left)); |
db9f0278 JB |
341 | |
342 | UNGCPRO; | |
343 | return val; | |
344 | } | |
345 | ||
346 | DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0, | |
347 | "(prog1 FIRST BODY...): eval FIRST and BODY sequentially; value from FIRST.\n\ | |
348 | The value of FIRST is saved during the evaluation of the remaining args,\n\ | |
349 | whose values are discarded.") | |
350 | (args) | |
351 | Lisp_Object args; | |
352 | { | |
353 | Lisp_Object val; | |
354 | register Lisp_Object args_left; | |
355 | struct gcpro gcpro1, gcpro2; | |
356 | register int argnum = 0; | |
357 | ||
265a9e55 | 358 | if (NILP(args)) |
db9f0278 JB |
359 | return Qnil; |
360 | ||
361 | args_left = args; | |
362 | val = Qnil; | |
363 | GCPRO2 (args, val); | |
364 | ||
365 | do | |
366 | { | |
367 | if (!(argnum++)) | |
368 | val = Feval (Fcar (args_left)); | |
369 | else | |
370 | Feval (Fcar (args_left)); | |
371 | args_left = Fcdr (args_left); | |
372 | } | |
265a9e55 | 373 | while (!NILP(args_left)); |
db9f0278 JB |
374 | |
375 | UNGCPRO; | |
376 | return val; | |
377 | } | |
378 | ||
379 | DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0, | |
380 | "(prog1 X Y BODY...): eval X, Y and BODY sequentially; value from Y.\n\ | |
381 | The value of Y is saved during the evaluation of the remaining args,\n\ | |
382 | whose values are discarded.") | |
383 | (args) | |
384 | Lisp_Object args; | |
385 | { | |
386 | Lisp_Object val; | |
387 | register Lisp_Object args_left; | |
388 | struct gcpro gcpro1, gcpro2; | |
389 | register int argnum = -1; | |
390 | ||
391 | val = Qnil; | |
392 | ||
265a9e55 | 393 | if (NILP(args)) |
db9f0278 JB |
394 | return Qnil; |
395 | ||
396 | args_left = args; | |
397 | val = Qnil; | |
398 | GCPRO2 (args, val); | |
399 | ||
400 | do | |
401 | { | |
402 | if (!(argnum++)) | |
403 | val = Feval (Fcar (args_left)); | |
404 | else | |
405 | Feval (Fcar (args_left)); | |
406 | args_left = Fcdr (args_left); | |
407 | } | |
265a9e55 | 408 | while (!NILP(args_left)); |
db9f0278 JB |
409 | |
410 | UNGCPRO; | |
411 | return val; | |
412 | } | |
413 | ||
414 | DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0, | |
415 | "(setq SYM VAL SYM VAL ...): set each SYM to the value of its VAL.\n\ | |
416 | The SYMs are not evaluated. Thus (setq x y) sets x to the value of y.\n\ | |
417 | Each SYM is set before the next VAL is computed.") | |
418 | (args) | |
419 | Lisp_Object args; | |
420 | { | |
421 | register Lisp_Object args_left; | |
422 | register Lisp_Object val, sym; | |
423 | struct gcpro gcpro1; | |
424 | ||
265a9e55 | 425 | if (NILP(args)) |
db9f0278 JB |
426 | return Qnil; |
427 | ||
428 | args_left = args; | |
429 | GCPRO1 (args); | |
430 | ||
431 | do | |
432 | { | |
433 | val = Feval (Fcar (Fcdr (args_left))); | |
434 | sym = Fcar (args_left); | |
435 | Fset (sym, val); | |
436 | args_left = Fcdr (Fcdr (args_left)); | |
437 | } | |
265a9e55 | 438 | while (!NILP(args_left)); |
db9f0278 JB |
439 | |
440 | UNGCPRO; | |
441 | return val; | |
442 | } | |
443 | ||
444 | DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0, | |
445 | "Return the argument, without evaluating it. `(quote x)' yields `x'.") | |
446 | (args) | |
447 | Lisp_Object args; | |
448 | { | |
449 | return Fcar (args); | |
450 | } | |
451 | ||
452 | DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0, | |
453 | "Like `quote', but preferred for objects which are functions.\n\ | |
454 | In byte compilation, `function' causes its argument to be compiled.\n\ | |
455 | `quote' cannot do that.") | |
456 | (args) | |
457 | Lisp_Object args; | |
458 | { | |
459 | return Fcar (args); | |
460 | } | |
461 | ||
462 | DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0, | |
463 | "Return t if function in which this appears was called interactively.\n\ | |
464 | This means that the function was called with call-interactively (which\n\ | |
465 | includes being called as the binding of a key)\n\ | |
466 | and input is currently coming from the keyboard (not in keyboard macro).") | |
467 | () | |
468 | { | |
469 | register struct backtrace *btp; | |
470 | register Lisp_Object fun; | |
471 | ||
472 | if (!INTERACTIVE) | |
473 | return Qnil; | |
474 | ||
db9f0278 | 475 | btp = backtrace_list; |
daa37602 JB |
476 | |
477 | /* If this isn't a byte-compiled function, there may be a frame at | |
478 | the top for Finteractive_p itself. If so, skip it. */ | |
479 | fun = Findirect_function (*btp->function); | |
480 | if (XTYPE (fun) == Lisp_Subr | |
481 | && (struct Lisp_Subr *) XPNTR (fun) == &Sinteractive_p) | |
db9f0278 | 482 | btp = btp->next; |
daa37602 JB |
483 | |
484 | /* If we're running an Emacs 18-style byte-compiled function, there | |
485 | may be a frame for Fbytecode. Now, given the strictest | |
486 | definition, this function isn't really being called | |
487 | interactively, but because that's the way Emacs 18 always builds | |
488 | byte-compiled functions, we'll accept it for now. */ | |
489 | if (EQ (*btp->function, Qbytecode)) | |
490 | btp = btp->next; | |
491 | ||
492 | /* If this isn't a byte-compiled function, then we may now be | |
493 | looking at several frames for special forms. Skip past them. */ | |
494 | while (btp && | |
495 | btp->nargs == UNEVALLED) | |
a6e3fa71 JB |
496 | btp = btp->next; |
497 | ||
daa37602 JB |
498 | /* btp now points at the frame of the innermost function that isn't |
499 | a special form, ignoring frames for Finteractive_p and/or | |
500 | Fbytecode at the top. If this frame is for a built-in function | |
501 | (such as load or eval-region) return nil. */ | |
ffd56f97 | 502 | fun = Findirect_function (*btp->function); |
db9f0278 JB |
503 | if (XTYPE (fun) == Lisp_Subr) |
504 | return Qnil; | |
505 | /* btp points to the frame of a Lisp function that called interactive-p. | |
506 | Return t if that function was called interactively. */ | |
507 | if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively)) | |
508 | return Qt; | |
509 | return Qnil; | |
510 | } | |
511 | ||
512 | DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0, | |
513 | "(defun NAME ARGLIST [DOCSTRING] BODY...): define NAME as a function.\n\ | |
514 | The definition is (lambda ARGLIST [DOCSTRING] BODY...).\n\ | |
515 | See also the function `interactive'.") | |
516 | (args) | |
517 | Lisp_Object args; | |
518 | { | |
519 | register Lisp_Object fn_name; | |
520 | register Lisp_Object defn; | |
521 | ||
522 | fn_name = Fcar (args); | |
523 | defn = Fcons (Qlambda, Fcdr (args)); | |
265a9e55 | 524 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
525 | defn = Fpurecopy (defn); |
526 | Ffset (fn_name, defn); | |
2a49b6e5 | 527 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
528 | return fn_name; |
529 | } | |
530 | ||
531 | DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0, | |
532 | "(defmacro NAME ARGLIST [DOCSTRING] BODY...): define NAME as a macro.\n\ | |
533 | The definition is (macro lambda ARGLIST [DOCSTRING] BODY...).\n\ | |
534 | When the macro is called, as in (NAME ARGS...),\n\ | |
535 | the function (lambda ARGLIST BODY...) is applied to\n\ | |
536 | the list ARGS... as it appears in the expression,\n\ | |
537 | and the result should be a form to be evaluated instead of the original.") | |
538 | (args) | |
539 | Lisp_Object args; | |
540 | { | |
541 | register Lisp_Object fn_name; | |
542 | register Lisp_Object defn; | |
543 | ||
544 | fn_name = Fcar (args); | |
545 | defn = Fcons (Qmacro, Fcons (Qlambda, Fcdr (args))); | |
265a9e55 | 546 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
547 | defn = Fpurecopy (defn); |
548 | Ffset (fn_name, defn); | |
2a49b6e5 | 549 | LOADHIST_ATTACH (fn_name); |
db9f0278 JB |
550 | return fn_name; |
551 | } | |
552 | ||
553 | DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0, | |
554 | "(defvar SYMBOL INITVALUE DOCSTRING): define SYMBOL as a variable.\n\ | |
555 | You are not required to define a variable in order to use it,\n\ | |
556 | but the definition can supply documentation and an initial value\n\ | |
557 | in a way that tags can recognize.\n\n\ | |
558 | INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.\n\ | |
06ef7355 RS |
559 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
560 | buffer-local values are not affected.\n\ | |
db9f0278 JB |
561 | INITVALUE and DOCSTRING are 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\ | |
564 | If INITVALUE is missing, SYMBOL's value is not set.") | |
565 | (args) | |
566 | Lisp_Object args; | |
567 | { | |
568 | register Lisp_Object sym, tem; | |
569 | ||
570 | sym = Fcar (args); | |
571 | tem = Fcdr (args); | |
265a9e55 | 572 | if (!NILP (tem)) |
db9f0278 JB |
573 | { |
574 | tem = Fdefault_boundp (sym); | |
265a9e55 | 575 | if (NILP (tem)) |
db9f0278 JB |
576 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); |
577 | } | |
578 | tem = Fcar (Fcdr (Fcdr (args))); | |
265a9e55 | 579 | if (!NILP (tem)) |
db9f0278 | 580 | { |
265a9e55 | 581 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
582 | tem = Fpurecopy (tem); |
583 | Fput (sym, Qvariable_documentation, tem); | |
584 | } | |
2a49b6e5 | 585 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
586 | return sym; |
587 | } | |
588 | ||
589 | DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0, | |
590 | "(defconst SYMBOL INITVALUE DOCSTRING): define SYMBOL as a constant variable.\n\ | |
591 | The intent is that programs do not change this value, but users may.\n\ | |
592 | Always sets the value of SYMBOL to the result of evalling INITVALUE.\n\ | |
06ef7355 RS |
593 | If SYMBOL is buffer-local, its default value is what is set;\n\ |
594 | buffer-local values are not affected.\n\ | |
db9f0278 JB |
595 | DOCSTRING is optional.\n\ |
596 | If DOCSTRING starts with *, this variable is identified as a user option.\n\ | |
597 | This means that M-x set-variable and M-x edit-options recognize it.\n\n\ | |
598 | Note: do not use `defconst' for user options in libraries that are not\n\ | |
599 | normally loaded, since it is useful for users to be able to specify\n\ | |
600 | their own values for such variables before loading the library.\n\ | |
601 | Since `defconst' unconditionally assigns the variable,\n\ | |
602 | it would override the user's choice.") | |
603 | (args) | |
604 | Lisp_Object args; | |
605 | { | |
606 | register Lisp_Object sym, tem; | |
607 | ||
608 | sym = Fcar (args); | |
609 | Fset_default (sym, Feval (Fcar (Fcdr (args)))); | |
610 | tem = Fcar (Fcdr (Fcdr (args))); | |
265a9e55 | 611 | if (!NILP (tem)) |
db9f0278 | 612 | { |
265a9e55 | 613 | if (!NILP (Vpurify_flag)) |
db9f0278 JB |
614 | tem = Fpurecopy (tem); |
615 | Fput (sym, Qvariable_documentation, tem); | |
616 | } | |
2a49b6e5 | 617 | LOADHIST_ATTACH (sym); |
db9f0278 JB |
618 | return sym; |
619 | } | |
620 | ||
621 | DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0, | |
622 | "Returns t if VARIABLE is intended to be set and modified by users.\n\ | |
623 | \(The alternative is a variable used internally in a Lisp program.)\n\ | |
624 | Determined by whether the first character of the documentation\n\ | |
625 | for the variable is \"*\"") | |
626 | (variable) | |
627 | Lisp_Object variable; | |
628 | { | |
629 | Lisp_Object documentation; | |
630 | ||
631 | documentation = Fget (variable, Qvariable_documentation); | |
632 | if (XTYPE (documentation) == Lisp_Int && XINT (documentation) < 0) | |
633 | return Qt; | |
634 | if ((XTYPE (documentation) == Lisp_String) && | |
635 | ((unsigned char) XSTRING (documentation)->data[0] == '*')) | |
636 | return Qt; | |
637 | return Qnil; | |
638 | } | |
639 | \f | |
640 | DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0, | |
641 | "(let* VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ | |
642 | The value of the last form in BODY is returned.\n\ | |
643 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
644 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
645 | Each VALUEFORM can refer to the symbols already bound by this VARLIST.") | |
646 | (args) | |
647 | Lisp_Object args; | |
648 | { | |
649 | Lisp_Object varlist, val, elt; | |
650 | int count = specpdl_ptr - specpdl; | |
651 | struct gcpro gcpro1, gcpro2, gcpro3; | |
652 | ||
653 | GCPRO3 (args, elt, varlist); | |
654 | ||
655 | varlist = Fcar (args); | |
265a9e55 | 656 | while (!NILP (varlist)) |
db9f0278 JB |
657 | { |
658 | QUIT; | |
659 | elt = Fcar (varlist); | |
660 | if (XTYPE (elt) == Lisp_Symbol) | |
661 | specbind (elt, Qnil); | |
08564963 JB |
662 | else if (! NILP (Fcdr (Fcdr (elt)))) |
663 | Fsignal (Qerror, | |
664 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
665 | elt)); | |
db9f0278 JB |
666 | else |
667 | { | |
668 | val = Feval (Fcar (Fcdr (elt))); | |
669 | specbind (Fcar (elt), val); | |
670 | } | |
671 | varlist = Fcdr (varlist); | |
672 | } | |
673 | UNGCPRO; | |
674 | val = Fprogn (Fcdr (args)); | |
675 | return unbind_to (count, val); | |
676 | } | |
677 | ||
678 | DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0, | |
679 | "(let VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\ | |
680 | The value of the last form in BODY is returned.\n\ | |
681 | Each element of VARLIST is a symbol (which is bound to nil)\n\ | |
682 | or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\ | |
683 | All the VALUEFORMs are evalled before any symbols are bound.") | |
684 | (args) | |
685 | Lisp_Object args; | |
686 | { | |
687 | Lisp_Object *temps, tem; | |
688 | register Lisp_Object elt, varlist; | |
689 | int count = specpdl_ptr - specpdl; | |
690 | register int argnum; | |
691 | struct gcpro gcpro1, gcpro2; | |
692 | ||
693 | varlist = Fcar (args); | |
694 | ||
695 | /* Make space to hold the values to give the bound variables */ | |
696 | elt = Flength (varlist); | |
697 | temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object)); | |
698 | ||
699 | /* Compute the values and store them in `temps' */ | |
700 | ||
701 | GCPRO2 (args, *temps); | |
702 | gcpro2.nvars = 0; | |
703 | ||
265a9e55 | 704 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
705 | { |
706 | QUIT; | |
707 | elt = Fcar (varlist); | |
708 | if (XTYPE (elt) == Lisp_Symbol) | |
709 | temps [argnum++] = Qnil; | |
08564963 JB |
710 | else if (! NILP (Fcdr (Fcdr (elt)))) |
711 | Fsignal (Qerror, | |
712 | Fcons (build_string ("`let' bindings can have only one value-form"), | |
713 | elt)); | |
db9f0278 JB |
714 | else |
715 | temps [argnum++] = Feval (Fcar (Fcdr (elt))); | |
716 | gcpro2.nvars = argnum; | |
717 | } | |
718 | UNGCPRO; | |
719 | ||
720 | varlist = Fcar (args); | |
265a9e55 | 721 | for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist)) |
db9f0278 JB |
722 | { |
723 | elt = Fcar (varlist); | |
724 | tem = temps[argnum++]; | |
725 | if (XTYPE (elt) == Lisp_Symbol) | |
726 | specbind (elt, tem); | |
727 | else | |
728 | specbind (Fcar (elt), tem); | |
729 | } | |
730 | ||
731 | elt = Fprogn (Fcdr (args)); | |
732 | return unbind_to (count, elt); | |
733 | } | |
734 | ||
735 | DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0, | |
736 | "(while TEST BODY...): if TEST yields non-nil, eval BODY... and repeat.\n\ | |
737 | The order of execution is thus TEST, BODY, TEST, BODY and so on\n\ | |
738 | until TEST returns nil.") | |
739 | (args) | |
740 | Lisp_Object args; | |
741 | { | |
742 | Lisp_Object test, body, tem; | |
743 | struct gcpro gcpro1, gcpro2; | |
744 | ||
745 | GCPRO2 (test, body); | |
746 | ||
747 | test = Fcar (args); | |
748 | body = Fcdr (args); | |
265a9e55 | 749 | while (tem = Feval (test), !NILP (tem)) |
db9f0278 JB |
750 | { |
751 | QUIT; | |
752 | Fprogn (body); | |
753 | } | |
754 | ||
755 | UNGCPRO; | |
756 | return Qnil; | |
757 | } | |
758 | ||
759 | DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0, | |
760 | "Return result of expanding macros at top level of FORM.\n\ | |
761 | If FORM is not a macro call, it is returned unchanged.\n\ | |
762 | Otherwise, the macro is expanded and the expansion is considered\n\ | |
763 | in place of FORM. When a non-macro-call results, it is returned.\n\n\ | |
764 | The second optional arg ENVIRONMENT species an environment of macro\n\ | |
765 | definitions to shadow the loaded ones for use in file byte-compilation.") | |
766 | (form, env) | |
767 | register Lisp_Object form; | |
768 | Lisp_Object env; | |
769 | { | |
23d6b5a6 | 770 | /* With cleanups from Hallvard Furuseth. */ |
db9f0278 JB |
771 | register Lisp_Object expander, sym, def, tem; |
772 | ||
773 | while (1) | |
774 | { | |
775 | /* Come back here each time we expand a macro call, | |
776 | in case it expands into another macro call. */ | |
777 | if (XTYPE (form) != Lisp_Cons) | |
778 | break; | |
23d6b5a6 JB |
779 | /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */ |
780 | def = sym = XCONS (form)->car; | |
781 | tem = Qnil; | |
db9f0278 JB |
782 | /* Trace symbols aliases to other symbols |
783 | until we get a symbol that is not an alias. */ | |
23d6b5a6 | 784 | while (XTYPE (def) == Lisp_Symbol) |
db9f0278 JB |
785 | { |
786 | QUIT; | |
23d6b5a6 | 787 | sym = def; |
db9f0278 | 788 | tem = Fassq (sym, env); |
265a9e55 | 789 | if (NILP (tem)) |
db9f0278 JB |
790 | { |
791 | def = XSYMBOL (sym)->function; | |
23d6b5a6 JB |
792 | if (!EQ (def, Qunbound)) |
793 | continue; | |
db9f0278 | 794 | } |
23d6b5a6 | 795 | break; |
db9f0278 JB |
796 | } |
797 | /* Right now TEM is the result from SYM in ENV, | |
798 | and if TEM is nil then DEF is SYM's function definition. */ | |
265a9e55 | 799 | if (NILP (tem)) |
db9f0278 JB |
800 | { |
801 | /* SYM is not mentioned in ENV. | |
802 | Look at its function definition. */ | |
803 | if (EQ (def, Qunbound) | |
804 | || XTYPE (def) != Lisp_Cons) | |
805 | /* Not defined or definition not suitable */ | |
806 | break; | |
807 | if (EQ (XCONS (def)->car, Qautoload)) | |
808 | { | |
809 | /* Autoloading function: will it be a macro when loaded? */ | |
ee9ee63c JB |
810 | tem = Fnth (make_number (4), def); |
811 | if (EQ (XCONS (tem)->car, Qt) | |
812 | || EQ (XCONS (tem)->car, Qmacro)) | |
813 | /* Yes, load it and try again. */ | |
814 | { | |
815 | do_autoload (def, sym); | |
816 | continue; | |
817 | } | |
818 | else | |
db9f0278 | 819 | break; |
db9f0278 JB |
820 | } |
821 | else if (!EQ (XCONS (def)->car, Qmacro)) | |
822 | break; | |
823 | else expander = XCONS (def)->cdr; | |
824 | } | |
825 | else | |
826 | { | |
827 | expander = XCONS (tem)->cdr; | |
265a9e55 | 828 | if (NILP (expander)) |
db9f0278 JB |
829 | break; |
830 | } | |
db9f0278 JB |
831 | form = apply1 (expander, XCONS (form)->cdr); |
832 | } | |
833 | return form; | |
834 | } | |
835 | \f | |
836 | DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0, | |
837 | "(catch TAG BODY...): eval BODY allowing nonlocal exits using `throw'.\n\ | |
838 | TAG is evalled to get the tag to use. Then the BODY is executed.\n\ | |
839 | Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.\n\ | |
840 | If no throw happens, `catch' returns the value of the last BODY form.\n\ | |
841 | If a throw happens, it specifies the value to return from `catch'.") | |
842 | (args) | |
843 | Lisp_Object args; | |
844 | { | |
845 | register Lisp_Object tag; | |
846 | struct gcpro gcpro1; | |
847 | ||
848 | GCPRO1 (args); | |
849 | tag = Feval (Fcar (args)); | |
850 | UNGCPRO; | |
851 | return internal_catch (tag, Fprogn, Fcdr (args)); | |
852 | } | |
853 | ||
854 | /* Set up a catch, then call C function FUNC on argument ARG. | |
855 | FUNC should return a Lisp_Object. | |
856 | This is how catches are done from within C code. */ | |
857 | ||
858 | Lisp_Object | |
859 | internal_catch (tag, func, arg) | |
860 | Lisp_Object tag; | |
861 | Lisp_Object (*func) (); | |
862 | Lisp_Object arg; | |
863 | { | |
864 | /* This structure is made part of the chain `catchlist'. */ | |
865 | struct catchtag c; | |
866 | ||
867 | /* Fill in the components of c, and put it on the list. */ | |
868 | c.next = catchlist; | |
869 | c.tag = tag; | |
870 | c.val = Qnil; | |
871 | c.backlist = backtrace_list; | |
872 | c.handlerlist = handlerlist; | |
873 | c.lisp_eval_depth = lisp_eval_depth; | |
874 | c.pdlcount = specpdl_ptr - specpdl; | |
875 | c.poll_suppress_count = poll_suppress_count; | |
876 | c.gcpro = gcprolist; | |
877 | catchlist = &c; | |
878 | ||
879 | /* Call FUNC. */ | |
880 | if (! _setjmp (c.jmp)) | |
881 | c.val = (*func) (arg); | |
882 | ||
883 | /* Throw works by a longjmp that comes right here. */ | |
884 | catchlist = c.next; | |
885 | return c.val; | |
886 | } | |
887 | ||
ba410f40 JB |
888 | /* Unwind the specbind, catch, and handler stacks back to CATCH, and |
889 | jump to that CATCH, returning VALUE as the value of that catch. | |
db9f0278 | 890 | |
ba410f40 JB |
891 | This is the guts Fthrow and Fsignal; they differ only in the way |
892 | they choose the catch tag to throw to. A catch tag for a | |
893 | condition-case form has a TAG of Qnil. | |
db9f0278 | 894 | |
ba410f40 JB |
895 | Before each catch is discarded, unbind all special bindings and |
896 | execute all unwind-protect clauses made above that catch. Unwind | |
897 | the handler stack as we go, so that the proper handlers are in | |
898 | effect for each unwind-protect clause we run. At the end, restore | |
899 | some static info saved in CATCH, and longjmp to the location | |
900 | specified in the | |
901 | ||
902 | This is used for correct unwinding in Fthrow and Fsignal. */ | |
db9f0278 JB |
903 | |
904 | static void | |
ba410f40 | 905 | unwind_to_catch (catch, value) |
db9f0278 | 906 | struct catchtag *catch; |
ba410f40 | 907 | Lisp_Object value; |
db9f0278 JB |
908 | { |
909 | register int last_time; | |
910 | ||
ba410f40 JB |
911 | /* Save the value in the tag. */ |
912 | catch->val = value; | |
913 | ||
82da7701 JB |
914 | /* Restore the polling-suppression count. */ |
915 | if (catch->poll_suppress_count > poll_suppress_count) | |
916 | abort (); | |
917 | while (catch->poll_suppress_count < poll_suppress_count) | |
918 | start_polling (); | |
919 | ||
db9f0278 JB |
920 | do |
921 | { | |
922 | last_time = catchlist == catch; | |
82da7701 JB |
923 | |
924 | /* Unwind the specpdl stack, and then restore the proper set of | |
925 | handlers. */ | |
db9f0278 JB |
926 | unbind_to (catchlist->pdlcount, Qnil); |
927 | handlerlist = catchlist->handlerlist; | |
928 | catchlist = catchlist->next; | |
929 | } | |
930 | while (! last_time); | |
931 | ||
932 | gcprolist = catch->gcpro; | |
933 | backtrace_list = catch->backlist; | |
934 | lisp_eval_depth = catch->lisp_eval_depth; | |
ba410f40 JB |
935 | |
936 | _longjmp (catch->jmp, 1); | |
db9f0278 JB |
937 | } |
938 | ||
939 | DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0, | |
940 | "(throw TAG VALUE): throw to the catch for TAG and return VALUE from it.\n\ | |
941 | Both TAG and VALUE are evalled.") | |
942 | (tag, val) | |
943 | register Lisp_Object tag, val; | |
944 | { | |
945 | register struct catchtag *c; | |
946 | ||
947 | while (1) | |
948 | { | |
265a9e55 | 949 | if (!NILP (tag)) |
db9f0278 JB |
950 | for (c = catchlist; c; c = c->next) |
951 | { | |
952 | if (EQ (c->tag, tag)) | |
ba410f40 | 953 | unwind_to_catch (c, val); |
db9f0278 JB |
954 | } |
955 | tag = Fsignal (Qno_catch, Fcons (tag, Fcons (val, Qnil))); | |
956 | } | |
957 | } | |
958 | ||
959 | ||
960 | DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0, | |
961 | "Do BODYFORM, protecting with UNWINDFORMS.\n\ | |
962 | Usage looks like (unwind-protect BODYFORM UNWINDFORMS...).\n\ | |
963 | If BODYFORM completes normally, its value is returned\n\ | |
964 | after executing the UNWINDFORMS.\n\ | |
965 | If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.") | |
966 | (args) | |
967 | Lisp_Object args; | |
968 | { | |
969 | Lisp_Object val; | |
970 | int count = specpdl_ptr - specpdl; | |
971 | ||
972 | record_unwind_protect (0, Fcdr (args)); | |
973 | val = Feval (Fcar (args)); | |
974 | return unbind_to (count, val); | |
975 | } | |
976 | \f | |
977 | /* Chain of condition handlers currently in effect. | |
978 | The elements of this chain are contained in the stack frames | |
979 | of Fcondition_case and internal_condition_case. | |
980 | When an error is signaled (by calling Fsignal, below), | |
981 | this chain is searched for an element that applies. */ | |
982 | ||
983 | struct handler *handlerlist; | |
984 | ||
985 | DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0, | |
986 | "Regain control when an error is signaled.\n\ | |
987 | Usage looks like (condition-case VAR BODYFORM HANDLERS...).\n\ | |
988 | executes BODYFORM and returns its value if no error happens.\n\ | |
989 | Each element of HANDLERS looks like (CONDITION-NAME BODY...)\n\ | |
990 | where the BODY is made of Lisp expressions.\n\n\ | |
991 | A handler is applicable to an error\n\ | |
992 | if CONDITION-NAME is one of the error's condition names.\n\ | |
993 | If an error happens, the first applicable handler is run.\n\ | |
994 | \n\ | |
995 | When a handler handles an error,\n\ | |
996 | control returns to the condition-case and the handler BODY... is executed\n\ | |
997 | with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).\n\ | |
998 | VAR may be nil; then you do not get access to the signal information.\n\ | |
999 | \n\ | |
1000 | The value of the last BODY form is returned from the condition-case.\n\ | |
1001 | See also the function `signal' for more info.") | |
1002 | (args) | |
1003 | Lisp_Object args; | |
1004 | { | |
1005 | Lisp_Object val; | |
1006 | struct catchtag c; | |
1007 | struct handler h; | |
82da7701 | 1008 | register Lisp_Object var, bodyform, handlers; |
db9f0278 | 1009 | |
82da7701 JB |
1010 | var = Fcar (args); |
1011 | bodyform = Fcar (Fcdr (args)); | |
1012 | handlers = Fcdr (Fcdr (args)); | |
1013 | CHECK_SYMBOL (var, 0); | |
1014 | ||
1015 | for (val = handlers; ! NILP (val); val = Fcdr (val)) | |
1016 | { | |
1017 | Lisp_Object tem; | |
1018 | tem = Fcar (val); | |
1019 | if ((!NILP (tem)) && | |
1020 | (!CONSP (tem) || (XTYPE (XCONS (tem)->car) != Lisp_Symbol))) | |
1021 | error ("Invalid condition handler", tem); | |
1022 | } | |
db9f0278 JB |
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 | { | |
265a9e55 | 1034 | if (!NILP (h.var)) |
db9f0278 JB |
1035 | specbind (h.var, Fcdr (c.val)); |
1036 | val = Fprogn (Fcdr (Fcar (c.val))); | |
82da7701 JB |
1037 | |
1038 | /* Note that this just undoes the binding of h.var; whoever | |
1039 | longjumped to us unwound the stack to c.pdlcount before | |
1040 | throwing. */ | |
db9f0278 JB |
1041 | unbind_to (c.pdlcount, Qnil); |
1042 | return val; | |
1043 | } | |
1044 | c.next = catchlist; | |
1045 | catchlist = &c; | |
db9f0278 | 1046 | |
82da7701 JB |
1047 | h.var = var; |
1048 | h.handler = handlers; | |
db9f0278 | 1049 | h.next = handlerlist; |
db9f0278 JB |
1050 | h.tag = &c; |
1051 | handlerlist = &h; | |
1052 | ||
82da7701 | 1053 | val = Feval (bodyform); |
db9f0278 JB |
1054 | catchlist = c.next; |
1055 | handlerlist = h.next; | |
1056 | return val; | |
1057 | } | |
1058 | ||
1059 | Lisp_Object | |
1060 | internal_condition_case (bfun, handlers, hfun) | |
1061 | Lisp_Object (*bfun) (); | |
1062 | Lisp_Object handlers; | |
1063 | Lisp_Object (*hfun) (); | |
1064 | { | |
1065 | Lisp_Object val; | |
1066 | struct catchtag c; | |
1067 | struct handler h; | |
1068 | ||
1069 | c.tag = Qnil; | |
1070 | c.val = Qnil; | |
1071 | c.backlist = backtrace_list; | |
1072 | c.handlerlist = handlerlist; | |
1073 | c.lisp_eval_depth = lisp_eval_depth; | |
1074 | c.pdlcount = specpdl_ptr - specpdl; | |
1075 | c.poll_suppress_count = poll_suppress_count; | |
1076 | c.gcpro = gcprolist; | |
1077 | if (_setjmp (c.jmp)) | |
1078 | { | |
1079 | return (*hfun) (Fcdr (c.val)); | |
1080 | } | |
1081 | c.next = catchlist; | |
1082 | catchlist = &c; | |
1083 | h.handler = handlers; | |
1084 | h.var = Qnil; | |
db9f0278 JB |
1085 | h.next = handlerlist; |
1086 | h.tag = &c; | |
1087 | handlerlist = &h; | |
1088 | ||
1089 | val = (*bfun) (); | |
1090 | catchlist = c.next; | |
1091 | handlerlist = h.next; | |
1092 | return val; | |
1093 | } | |
1094 | ||
1095 | static Lisp_Object find_handler_clause (); | |
1096 | ||
1097 | DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0, | |
1098 | "Signal an error. Args are SIGNAL-NAME, and associated DATA.\n\ | |
1099 | This function does not return.\n\n\ | |
1100 | A signal name is a symbol with an `error-conditions' property\n\ | |
1101 | that is a list of condition names.\n\ | |
1102 | A handler for any of those names will get to handle this signal.\n\ | |
1103 | The symbol `error' should normally be one of them.\n\ | |
1104 | \n\ | |
1105 | DATA should be a list. Its elements are printed as part of the error message.\n\ | |
1106 | If the signal is handled, DATA is made available to the handler.\n\ | |
1107 | See also the function `condition-case'.") | |
1108 | (sig, data) | |
1109 | Lisp_Object sig, data; | |
1110 | { | |
1111 | register struct handler *allhandlers = handlerlist; | |
1112 | Lisp_Object conditions; | |
1113 | extern int gc_in_progress; | |
1114 | extern int waiting_for_input; | |
1115 | Lisp_Object debugger_value; | |
1116 | ||
1117 | quit_error_check (); | |
1118 | immediate_quit = 0; | |
1119 | if (gc_in_progress || waiting_for_input) | |
1120 | abort (); | |
1121 | ||
e5d77022 | 1122 | #ifdef HAVE_X_WINDOWS |
db9f0278 | 1123 | TOTALLY_UNBLOCK_INPUT; |
e5d77022 | 1124 | #endif |
db9f0278 JB |
1125 | |
1126 | conditions = Fget (sig, Qerror_conditions); | |
1127 | ||
1128 | for (; handlerlist; handlerlist = handlerlist->next) | |
1129 | { | |
1130 | register Lisp_Object clause; | |
1131 | clause = find_handler_clause (handlerlist->handler, conditions, | |
1132 | sig, data, &debugger_value); | |
1133 | ||
1134 | #if 0 /* Most callers are not prepared to handle gc if this returns. | |
1135 | So, since this feature is not very useful, take it out. */ | |
1136 | /* If have called debugger and user wants to continue, | |
1137 | just return nil. */ | |
1138 | if (EQ (clause, Qlambda)) | |
1139 | return debugger_value; | |
1140 | #else | |
1141 | if (EQ (clause, Qlambda)) | |
82da7701 JB |
1142 | { |
1143 | /* We can't return values to code which signalled an error, but we | |
1144 | can continue code which has signalled a quit. */ | |
1145 | if (EQ (sig, Qquit)) | |
1146 | return Qnil; | |
1147 | else | |
db9f0278 | 1148 | error ("Returning a value from an error is no longer supported"); |
82da7701 | 1149 | } |
db9f0278 JB |
1150 | #endif |
1151 | ||
265a9e55 | 1152 | if (!NILP (clause)) |
db9f0278 JB |
1153 | { |
1154 | struct handler *h = handlerlist; | |
db9f0278 | 1155 | handlerlist = allhandlers; |
ba410f40 | 1156 | unwind_to_catch (h->tag, Fcons (clause, Fcons (sig, data))); |
db9f0278 JB |
1157 | } |
1158 | } | |
1159 | ||
1160 | handlerlist = allhandlers; | |
1161 | /* If no handler is present now, try to run the debugger, | |
1162 | and if that fails, throw to top level. */ | |
1163 | find_handler_clause (Qerror, conditions, sig, data, &debugger_value); | |
1164 | Fthrow (Qtop_level, Qt); | |
1165 | } | |
1166 | ||
128c0f66 RM |
1167 | /* Return nonzero iff LIST is a non-nil atom or |
1168 | a list containing one of CONDITIONS. */ | |
1169 | ||
1170 | static int | |
1171 | wants_debugger (list, conditions) | |
1172 | Lisp_Object list, conditions; | |
1173 | { | |
4de86b16 | 1174 | if (NILP (list)) |
128c0f66 RM |
1175 | return 0; |
1176 | if (! CONSP (list)) | |
1177 | return 1; | |
1178 | ||
ab67260b | 1179 | while (CONSP (conditions)) |
128c0f66 | 1180 | { |
ab67260b RS |
1181 | Lisp_Object this, tail; |
1182 | this = XCONS (conditions)->car; | |
1183 | for (tail = list; CONSP (tail); tail = XCONS (tail)->cdr) | |
1184 | if (EQ (XCONS (tail)->car, this)) | |
128c0f66 | 1185 | return 1; |
128c0f66 RM |
1186 | conditions = XCONS (conditions)->cdr; |
1187 | } | |
ab67260b | 1188 | return 0; |
128c0f66 RM |
1189 | } |
1190 | ||
1191 | /* Value of Qlambda means we have called debugger and user has continued. | |
1192 | Store value returned from debugger into *DEBUGGER_VALUE_PTR. */ | |
db9f0278 JB |
1193 | |
1194 | static Lisp_Object | |
1195 | find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr) | |
1196 | Lisp_Object handlers, conditions, sig, data; | |
1197 | Lisp_Object *debugger_value_ptr; | |
1198 | { | |
1199 | register Lisp_Object h; | |
1200 | register Lisp_Object tem; | |
1201 | register Lisp_Object tem1; | |
1202 | ||
1203 | if (EQ (handlers, Qt)) /* t is used by handlers for all conditions, set up by C code. */ | |
1204 | return Qt; | |
1205 | if (EQ (handlers, Qerror)) /* error is used similarly, but means display a backtrace too */ | |
1206 | { | |
128c0f66 | 1207 | if (wants_debugger (Vstack_trace_on_error, conditions)) |
db9f0278 | 1208 | internal_with_output_to_temp_buffer ("*Backtrace*", Fbacktrace, Qnil); |
ba410f40 JB |
1209 | if ((EQ (sig, Qquit) |
1210 | ? debug_on_quit | |
1211 | : wants_debugger (Vdebug_on_error, conditions)) | |
1212 | && when_entered_debugger < num_nonmacro_input_chars) | |
db9f0278 JB |
1213 | { |
1214 | int count = specpdl_ptr - specpdl; | |
1215 | specbind (Qdebug_on_error, Qnil); | |
1216 | *debugger_value_ptr = | |
1217 | call_debugger (Fcons (Qerror, | |
1218 | Fcons (Fcons (sig, data), | |
1219 | Qnil))); | |
1220 | return unbind_to (count, Qlambda); | |
1221 | } | |
1222 | return Qt; | |
1223 | } | |
1224 | for (h = handlers; CONSP (h); h = Fcdr (h)) | |
1225 | { | |
1226 | tem1 = Fcar (h); | |
1227 | if (!CONSP (tem1)) | |
1228 | continue; | |
1229 | tem = Fmemq (Fcar (tem1), conditions); | |
265a9e55 | 1230 | if (!NILP (tem)) |
db9f0278 JB |
1231 | return tem1; |
1232 | } | |
1233 | return Qnil; | |
1234 | } | |
1235 | ||
1236 | /* dump an error message; called like printf */ | |
1237 | ||
1238 | /* VARARGS 1 */ | |
1239 | void | |
1240 | error (m, a1, a2, a3) | |
1241 | char *m; | |
1242 | { | |
1243 | char buf[200]; | |
1244 | sprintf (buf, m, a1, a2, a3); | |
1245 | ||
1246 | while (1) | |
1247 | Fsignal (Qerror, Fcons (build_string (buf), Qnil)); | |
1248 | } | |
1249 | \f | |
1250 | DEFUN ("commandp", Fcommandp, Scommandp, 1, 1, 0, | |
1251 | "T if FUNCTION makes provisions for interactive calling.\n\ | |
1252 | This means it contains a description for how to read arguments to give it.\n\ | |
1253 | The value is nil for an invalid function or a symbol with no function\n\ | |
1254 | definition.\n\ | |
1255 | \n\ | |
1256 | Interactively callable functions include strings and vectors (treated\n\ | |
1257 | as keyboard macros), lambda-expressions that contain a top-level call\n\ | |
1258 | to `interactive', autoload definitions made by `autoload' with non-nil\n\ | |
1259 | fourth argument, and some of the built-in functions of Lisp.\n\ | |
1260 | \n\ | |
1261 | Also, a symbol satisfies `commandp' if its function definition does so.") | |
1262 | (function) | |
1263 | Lisp_Object function; | |
1264 | { | |
1265 | register Lisp_Object fun; | |
1266 | register Lisp_Object funcar; | |
1267 | register Lisp_Object tem; | |
1268 | register int i = 0; | |
1269 | ||
1270 | fun = function; | |
1271 | ||
ffd56f97 JB |
1272 | fun = indirect_function (fun); |
1273 | if (EQ (fun, Qunbound)) | |
1274 | return Qnil; | |
db9f0278 JB |
1275 | |
1276 | /* Emacs primitives are interactive if their DEFUN specifies an | |
1277 | interactive spec. */ | |
1278 | if (XTYPE (fun) == Lisp_Subr) | |
1279 | { | |
1280 | if (XSUBR (fun)->prompt) | |
1281 | return Qt; | |
1282 | else | |
1283 | return Qnil; | |
1284 | } | |
1285 | ||
1286 | /* Bytecode objects are interactive if they are long enough to | |
1287 | have an element whose index is COMPILED_INTERACTIVE, which is | |
1288 | where the interactive spec is stored. */ | |
1289 | else if (XTYPE (fun) == Lisp_Compiled) | |
1290 | return (XVECTOR (fun)->size > COMPILED_INTERACTIVE | |
1291 | ? Qt : Qnil); | |
1292 | ||
1293 | /* Strings and vectors are keyboard macros. */ | |
1294 | if (XTYPE (fun) == Lisp_String | |
1295 | || XTYPE (fun) == Lisp_Vector) | |
1296 | return Qt; | |
1297 | ||
1298 | /* Lists may represent commands. */ | |
1299 | if (!CONSP (fun)) | |
1300 | return Qnil; | |
1301 | funcar = Fcar (fun); | |
1302 | if (XTYPE (funcar) != Lisp_Symbol) | |
1303 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1304 | if (EQ (funcar, Qlambda)) | |
1305 | return Fassq (Qinteractive, Fcdr (Fcdr (fun))); | |
1306 | if (EQ (funcar, Qmocklisp)) | |
1307 | return Qt; /* All mocklisp functions can be called interactively */ | |
1308 | if (EQ (funcar, Qautoload)) | |
1309 | return Fcar (Fcdr (Fcdr (Fcdr (fun)))); | |
1310 | else | |
1311 | return Qnil; | |
1312 | } | |
1313 | ||
1314 | /* ARGSUSED */ | |
1315 | DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0, | |
1316 | "Define FUNCTION to autoload from FILE.\n\ | |
1317 | FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\ | |
1318 | Third arg DOCSTRING is documentation for the function.\n\ | |
1319 | Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\ | |
ee9ee63c JB |
1320 | Fifth arg TYPE indicates the type of the object:\n\ |
1321 | nil or omitted says FUNCTION is a function,\n\ | |
1322 | `keymap' says FUNCTION is really a keymap, and\n\ | |
1323 | `macro' or t says FUNCTION is really a macro.\n\ | |
db9f0278 JB |
1324 | Third through fifth args give info about the real definition.\n\ |
1325 | They default to nil.\n\ | |
1326 | If FUNCTION is already defined other than as an autoload,\n\ | |
1327 | this does nothing and returns nil.") | |
ee9ee63c JB |
1328 | (function, file, docstring, interactive, type) |
1329 | Lisp_Object function, file, docstring, interactive, type; | |
db9f0278 JB |
1330 | { |
1331 | #ifdef NO_ARG_ARRAY | |
1332 | Lisp_Object args[4]; | |
1333 | #endif | |
1334 | ||
1335 | CHECK_SYMBOL (function, 0); | |
1336 | CHECK_STRING (file, 1); | |
1337 | ||
1338 | /* If function is defined and not as an autoload, don't override */ | |
1339 | if (!EQ (XSYMBOL (function)->function, Qunbound) | |
1340 | && !(XTYPE (XSYMBOL (function)->function) == Lisp_Cons | |
1341 | && EQ (XCONS (XSYMBOL (function)->function)->car, Qautoload))) | |
1342 | return Qnil; | |
1343 | ||
1344 | #ifdef NO_ARG_ARRAY | |
1345 | args[0] = file; | |
1346 | args[1] = docstring; | |
1347 | args[2] = interactive; | |
ee9ee63c | 1348 | args[3] = type; |
db9f0278 JB |
1349 | |
1350 | return Ffset (function, Fcons (Qautoload, Flist (4, &args[0]))); | |
1351 | #else /* NO_ARG_ARRAY */ | |
1352 | return Ffset (function, Fcons (Qautoload, Flist (4, &file))); | |
1353 | #endif /* not NO_ARG_ARRAY */ | |
1354 | } | |
1355 | ||
1356 | Lisp_Object | |
1357 | un_autoload (oldqueue) | |
1358 | Lisp_Object oldqueue; | |
1359 | { | |
1360 | register Lisp_Object queue, first, second; | |
1361 | ||
1362 | /* Queue to unwind is current value of Vautoload_queue. | |
1363 | oldqueue is the shadowed value to leave in Vautoload_queue. */ | |
1364 | queue = Vautoload_queue; | |
1365 | Vautoload_queue = oldqueue; | |
1366 | while (CONSP (queue)) | |
1367 | { | |
1368 | first = Fcar (queue); | |
1369 | second = Fcdr (first); | |
1370 | first = Fcar (first); | |
1371 | if (EQ (second, Qnil)) | |
1372 | Vfeatures = first; | |
1373 | else | |
1374 | Ffset (first, second); | |
1375 | queue = Fcdr (queue); | |
1376 | } | |
1377 | return Qnil; | |
1378 | } | |
1379 | ||
1380 | do_autoload (fundef, funname) | |
1381 | Lisp_Object fundef, funname; | |
1382 | { | |
1383 | int count = specpdl_ptr - specpdl; | |
2a49b6e5 | 1384 | Lisp_Object fun, val, queue, first, second; |
db9f0278 JB |
1385 | |
1386 | fun = funname; | |
1387 | CHECK_SYMBOL (funname, 0); | |
1388 | ||
1389 | /* Value saved here is to be restored into Vautoload_queue */ | |
1390 | record_unwind_protect (un_autoload, Vautoload_queue); | |
1391 | Vautoload_queue = Qt; | |
1392 | Fload (Fcar (Fcdr (fundef)), Qnil, noninteractive ? Qt : Qnil, Qnil); | |
2a49b6e5 RS |
1393 | |
1394 | /* Save the old autoloads, in case we ever do an unload. */ | |
1395 | queue = Vautoload_queue; | |
1396 | while (CONSP (queue)) | |
1397 | { | |
1398 | first = Fcar (queue); | |
1399 | second = Fcdr (first); | |
1400 | first = Fcar (first); | |
1401 | if (!EQ (second, Qnil)) | |
1402 | Fput(first, Qautoload, (Fcdr (second))); | |
1403 | queue = Fcdr (queue); | |
1404 | } | |
1405 | ||
db9f0278 JB |
1406 | /* Once loading finishes, don't undo it. */ |
1407 | Vautoload_queue = Qt; | |
1408 | unbind_to (count, Qnil); | |
1409 | ||
ffd56f97 JB |
1410 | fun = Findirect_function (fun); |
1411 | ||
db9f0278 JB |
1412 | if (XTYPE (fun) == Lisp_Cons |
1413 | && EQ (XCONS (fun)->car, Qautoload)) | |
1414 | error ("Autoloading failed to define function %s", | |
1415 | XSYMBOL (funname)->name->data); | |
1416 | } | |
1417 | \f | |
1418 | DEFUN ("eval", Feval, Seval, 1, 1, 0, | |
1419 | "Evaluate FORM and return its value.") | |
1420 | (form) | |
1421 | Lisp_Object form; | |
1422 | { | |
1423 | Lisp_Object fun, val, original_fun, original_args; | |
1424 | Lisp_Object funcar; | |
1425 | struct backtrace backtrace; | |
1426 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1427 | ||
1428 | if (XTYPE (form) == Lisp_Symbol) | |
1429 | { | |
1430 | if (EQ (Vmocklisp_arguments, Qt)) | |
1431 | return Fsymbol_value (form); | |
1432 | val = Fsymbol_value (form); | |
265a9e55 | 1433 | if (NILP (val)) |
db9f0278 JB |
1434 | XFASTINT (val) = 0; |
1435 | else if (EQ (val, Qt)) | |
1436 | XFASTINT (val) = 1; | |
1437 | return val; | |
1438 | } | |
1439 | if (!CONSP (form)) | |
1440 | return form; | |
1441 | ||
1442 | QUIT; | |
1443 | if (consing_since_gc > gc_cons_threshold) | |
1444 | { | |
1445 | GCPRO1 (form); | |
1446 | Fgarbage_collect (); | |
1447 | UNGCPRO; | |
1448 | } | |
1449 | ||
1450 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1451 | { | |
1452 | if (max_lisp_eval_depth < 100) | |
1453 | max_lisp_eval_depth = 100; | |
1454 | if (lisp_eval_depth > max_lisp_eval_depth) | |
1455 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
1456 | } | |
1457 | ||
1458 | original_fun = Fcar (form); | |
1459 | original_args = Fcdr (form); | |
1460 | ||
1461 | backtrace.next = backtrace_list; | |
1462 | backtrace_list = &backtrace; | |
1463 | backtrace.function = &original_fun; /* This also protects them from gc */ | |
1464 | backtrace.args = &original_args; | |
1465 | backtrace.nargs = UNEVALLED; | |
1466 | backtrace.evalargs = 1; | |
1467 | backtrace.debug_on_exit = 0; | |
1468 | ||
1469 | if (debug_on_next_call) | |
1470 | do_debug_on_call (Qt); | |
1471 | ||
1472 | /* At this point, only original_fun and original_args | |
1473 | have values that will be used below */ | |
1474 | retry: | |
ffd56f97 | 1475 | fun = Findirect_function (original_fun); |
db9f0278 JB |
1476 | |
1477 | if (XTYPE (fun) == Lisp_Subr) | |
1478 | { | |
1479 | Lisp_Object numargs; | |
1480 | Lisp_Object argvals[7]; | |
1481 | Lisp_Object args_left; | |
1482 | register int i, maxargs; | |
1483 | ||
1484 | args_left = original_args; | |
1485 | numargs = Flength (args_left); | |
1486 | ||
1487 | if (XINT (numargs) < XSUBR (fun)->min_args || | |
1488 | (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT (numargs))) | |
1489 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
1490 | ||
1491 | if (XSUBR (fun)->max_args == UNEVALLED) | |
1492 | { | |
1493 | backtrace.evalargs = 0; | |
1494 | val = (*XSUBR (fun)->function) (args_left); | |
1495 | goto done; | |
1496 | } | |
1497 | ||
1498 | if (XSUBR (fun)->max_args == MANY) | |
1499 | { | |
1500 | /* Pass a vector of evaluated arguments */ | |
1501 | Lisp_Object *vals; | |
1502 | register int argnum = 0; | |
1503 | ||
1504 | vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
1505 | ||
1506 | GCPRO3 (args_left, fun, fun); | |
1507 | gcpro3.var = vals; | |
1508 | gcpro3.nvars = 0; | |
1509 | ||
265a9e55 | 1510 | while (!NILP (args_left)) |
db9f0278 JB |
1511 | { |
1512 | vals[argnum++] = Feval (Fcar (args_left)); | |
1513 | args_left = Fcdr (args_left); | |
1514 | gcpro3.nvars = argnum; | |
1515 | } | |
db9f0278 JB |
1516 | |
1517 | backtrace.args = vals; | |
1518 | backtrace.nargs = XINT (numargs); | |
1519 | ||
1520 | val = (*XSUBR (fun)->function) (XINT (numargs), vals); | |
a6e3fa71 | 1521 | UNGCPRO; |
db9f0278 JB |
1522 | goto done; |
1523 | } | |
1524 | ||
1525 | GCPRO3 (args_left, fun, fun); | |
1526 | gcpro3.var = argvals; | |
1527 | gcpro3.nvars = 0; | |
1528 | ||
1529 | maxargs = XSUBR (fun)->max_args; | |
1530 | for (i = 0; i < maxargs; args_left = Fcdr (args_left)) | |
1531 | { | |
1532 | argvals[i] = Feval (Fcar (args_left)); | |
1533 | gcpro3.nvars = ++i; | |
1534 | } | |
1535 | ||
1536 | UNGCPRO; | |
1537 | ||
1538 | backtrace.args = argvals; | |
1539 | backtrace.nargs = XINT (numargs); | |
1540 | ||
1541 | switch (i) | |
1542 | { | |
1543 | case 0: | |
1544 | val = (*XSUBR (fun)->function) (); | |
1545 | goto done; | |
1546 | case 1: | |
1547 | val = (*XSUBR (fun)->function) (argvals[0]); | |
1548 | goto done; | |
1549 | case 2: | |
1550 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1]); | |
1551 | goto done; | |
1552 | case 3: | |
1553 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1554 | argvals[2]); | |
1555 | goto done; | |
1556 | case 4: | |
1557 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], | |
1558 | argvals[2], argvals[3]); | |
1559 | goto done; | |
1560 | case 5: | |
1561 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1562 | argvals[3], argvals[4]); | |
1563 | goto done; | |
1564 | case 6: | |
1565 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1566 | argvals[3], argvals[4], argvals[5]); | |
1567 | goto done; | |
15c65264 RS |
1568 | case 7: |
1569 | val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2], | |
1570 | argvals[3], argvals[4], argvals[5], | |
1571 | argvals[6]); | |
1572 | goto done; | |
db9f0278 JB |
1573 | |
1574 | default: | |
08564963 JB |
1575 | /* Someone has created a subr that takes more arguments than |
1576 | is supported by this code. We need to either rewrite the | |
1577 | subr to use a different argument protocol, or add more | |
1578 | cases to this switch. */ | |
1579 | abort (); | |
db9f0278 JB |
1580 | } |
1581 | } | |
1582 | if (XTYPE (fun) == Lisp_Compiled) | |
1583 | val = apply_lambda (fun, original_args, 1); | |
1584 | else | |
1585 | { | |
1586 | if (!CONSP (fun)) | |
1587 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1588 | funcar = Fcar (fun); | |
1589 | if (XTYPE (funcar) != Lisp_Symbol) | |
1590 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1591 | if (EQ (funcar, Qautoload)) | |
1592 | { | |
1593 | do_autoload (fun, original_fun); | |
1594 | goto retry; | |
1595 | } | |
1596 | if (EQ (funcar, Qmacro)) | |
1597 | val = Feval (apply1 (Fcdr (fun), original_args)); | |
1598 | else if (EQ (funcar, Qlambda)) | |
1599 | val = apply_lambda (fun, original_args, 1); | |
1600 | else if (EQ (funcar, Qmocklisp)) | |
1601 | val = ml_apply (fun, original_args); | |
1602 | else | |
1603 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1604 | } | |
1605 | done: | |
1606 | if (!EQ (Vmocklisp_arguments, Qt)) | |
1607 | { | |
265a9e55 | 1608 | if (NILP (val)) |
db9f0278 JB |
1609 | XFASTINT (val) = 0; |
1610 | else if (EQ (val, Qt)) | |
1611 | XFASTINT (val) = 1; | |
1612 | } | |
1613 | lisp_eval_depth--; | |
1614 | if (backtrace.debug_on_exit) | |
1615 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
1616 | backtrace_list = backtrace.next; | |
1617 | return val; | |
1618 | } | |
1619 | \f | |
1620 | DEFUN ("apply", Fapply, Sapply, 2, MANY, 0, | |
1621 | "Call FUNCTION with our remaining args, using our last arg as list of args.\n\ | |
1622 | Thus, (apply '+ 1 2 '(3 4)) returns 10.") | |
1623 | (nargs, args) | |
1624 | int nargs; | |
1625 | Lisp_Object *args; | |
1626 | { | |
1627 | register int i, numargs; | |
1628 | register Lisp_Object spread_arg; | |
1629 | register Lisp_Object *funcall_args; | |
db9f0278 | 1630 | Lisp_Object fun; |
a6e3fa71 | 1631 | struct gcpro gcpro1; |
db9f0278 JB |
1632 | |
1633 | fun = args [0]; | |
1634 | funcall_args = 0; | |
1635 | spread_arg = args [nargs - 1]; | |
1636 | CHECK_LIST (spread_arg, nargs); | |
1637 | ||
1638 | numargs = XINT (Flength (spread_arg)); | |
1639 | ||
1640 | if (numargs == 0) | |
1641 | return Ffuncall (nargs - 1, args); | |
1642 | else if (numargs == 1) | |
1643 | { | |
1644 | args [nargs - 1] = XCONS (spread_arg)->car; | |
1645 | return Ffuncall (nargs, args); | |
1646 | } | |
1647 | ||
a6e3fa71 | 1648 | numargs += nargs - 2; |
db9f0278 | 1649 | |
ffd56f97 JB |
1650 | fun = indirect_function (fun); |
1651 | if (EQ (fun, Qunbound)) | |
db9f0278 | 1652 | { |
ffd56f97 JB |
1653 | /* Let funcall get the error */ |
1654 | fun = args[0]; | |
1655 | goto funcall; | |
db9f0278 JB |
1656 | } |
1657 | ||
1658 | if (XTYPE (fun) == Lisp_Subr) | |
1659 | { | |
1660 | if (numargs < XSUBR (fun)->min_args | |
1661 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
1662 | goto funcall; /* Let funcall get the error */ | |
1663 | else if (XSUBR (fun)->max_args > numargs) | |
1664 | { | |
1665 | /* Avoid making funcall cons up a yet another new vector of arguments | |
1666 | by explicitly supplying nil's for optional values */ | |
1667 | funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args) | |
1668 | * sizeof (Lisp_Object)); | |
1669 | for (i = numargs; i < XSUBR (fun)->max_args;) | |
1670 | funcall_args[++i] = Qnil; | |
a6e3fa71 JB |
1671 | GCPRO1 (*funcall_args); |
1672 | gcpro1.nvars = 1 + XSUBR (fun)->max_args; | |
db9f0278 JB |
1673 | } |
1674 | } | |
1675 | funcall: | |
1676 | /* We add 1 to numargs because funcall_args includes the | |
1677 | function itself as well as its arguments. */ | |
1678 | if (!funcall_args) | |
a6e3fa71 JB |
1679 | { |
1680 | funcall_args = (Lisp_Object *) alloca ((1 + numargs) | |
1681 | * sizeof (Lisp_Object)); | |
1682 | GCPRO1 (*funcall_args); | |
1683 | gcpro1.nvars = 1 + numargs; | |
1684 | } | |
1685 | ||
db9f0278 JB |
1686 | bcopy (args, funcall_args, nargs * sizeof (Lisp_Object)); |
1687 | /* Spread the last arg we got. Its first element goes in | |
1688 | the slot that it used to occupy, hence this value of I. */ | |
1689 | i = nargs - 1; | |
265a9e55 | 1690 | while (!NILP (spread_arg)) |
db9f0278 JB |
1691 | { |
1692 | funcall_args [i++] = XCONS (spread_arg)->car; | |
1693 | spread_arg = XCONS (spread_arg)->cdr; | |
1694 | } | |
a6e3fa71 JB |
1695 | |
1696 | RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args)); | |
db9f0278 JB |
1697 | } |
1698 | \f | |
1699 | /* Apply fn to arg */ | |
1700 | Lisp_Object | |
1701 | apply1 (fn, arg) | |
1702 | Lisp_Object fn, arg; | |
1703 | { | |
a6e3fa71 JB |
1704 | struct gcpro gcpro1; |
1705 | ||
1706 | GCPRO1 (fn); | |
265a9e55 | 1707 | if (NILP (arg)) |
a6e3fa71 JB |
1708 | RETURN_UNGCPRO (Ffuncall (1, &fn)); |
1709 | gcpro1.nvars = 2; | |
db9f0278 JB |
1710 | #ifdef NO_ARG_ARRAY |
1711 | { | |
1712 | Lisp_Object args[2]; | |
1713 | args[0] = fn; | |
1714 | args[1] = arg; | |
a6e3fa71 JB |
1715 | gcpro1.var = args; |
1716 | RETURN_UNGCPRO (Fapply (2, args)); | |
db9f0278 JB |
1717 | } |
1718 | #else /* not NO_ARG_ARRAY */ | |
a6e3fa71 | 1719 | RETURN_UNGCPRO (Fapply (2, &fn)); |
db9f0278 JB |
1720 | #endif /* not NO_ARG_ARRAY */ |
1721 | } | |
1722 | ||
1723 | /* Call function fn on no arguments */ | |
1724 | Lisp_Object | |
1725 | call0 (fn) | |
1726 | Lisp_Object fn; | |
1727 | { | |
a6e3fa71 JB |
1728 | struct gcpro gcpro1; |
1729 | ||
1730 | GCPRO1 (fn); | |
1731 | RETURN_UNGCPRO (Ffuncall (1, &fn)); | |
db9f0278 JB |
1732 | } |
1733 | ||
1734 | /* Call function fn with argument arg */ | |
1735 | /* ARGSUSED */ | |
1736 | Lisp_Object | |
1737 | call1 (fn, arg) | |
1738 | Lisp_Object fn, arg; | |
1739 | { | |
a6e3fa71 | 1740 | struct gcpro gcpro1; |
db9f0278 | 1741 | #ifdef NO_ARG_ARRAY |
a6e3fa71 JB |
1742 | Lisp_Object args[2]; |
1743 | ||
db9f0278 JB |
1744 | args[0] = fn; |
1745 | args[1] = arg; | |
a6e3fa71 JB |
1746 | GCPRO1 (args[0]); |
1747 | gcpro1.nvars = 2; | |
1748 | RETURN_UNGCPRO (Ffuncall (2, args)); | |
db9f0278 | 1749 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
1750 | GCPRO1 (fn); |
1751 | gcpro1.nvars = 2; | |
1752 | RETURN_UNGCPRO (Ffuncall (2, &fn)); | |
db9f0278 JB |
1753 | #endif /* not NO_ARG_ARRAY */ |
1754 | } | |
1755 | ||
1756 | /* Call function fn with arguments arg, arg1 */ | |
1757 | /* ARGSUSED */ | |
1758 | Lisp_Object | |
1759 | call2 (fn, arg, arg1) | |
1760 | Lisp_Object fn, arg, arg1; | |
1761 | { | |
a6e3fa71 | 1762 | struct gcpro gcpro1; |
db9f0278 JB |
1763 | #ifdef NO_ARG_ARRAY |
1764 | Lisp_Object args[3]; | |
1765 | args[0] = fn; | |
1766 | args[1] = arg; | |
1767 | args[2] = arg1; | |
a6e3fa71 JB |
1768 | GCPRO1 (args[0]); |
1769 | gcpro1.nvars = 3; | |
1770 | RETURN_UNGCPRO (Ffuncall (3, args)); | |
db9f0278 | 1771 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
1772 | GCPRO1 (fn); |
1773 | gcpro1.nvars = 3; | |
1774 | RETURN_UNGCPRO (Ffuncall (3, &fn)); | |
db9f0278 JB |
1775 | #endif /* not NO_ARG_ARRAY */ |
1776 | } | |
1777 | ||
1778 | /* Call function fn with arguments arg, arg1, arg2 */ | |
1779 | /* ARGSUSED */ | |
1780 | Lisp_Object | |
1781 | call3 (fn, arg, arg1, arg2) | |
1782 | Lisp_Object fn, arg, arg1, arg2; | |
1783 | { | |
a6e3fa71 | 1784 | struct gcpro gcpro1; |
db9f0278 JB |
1785 | #ifdef NO_ARG_ARRAY |
1786 | Lisp_Object args[4]; | |
1787 | args[0] = fn; | |
1788 | args[1] = arg; | |
1789 | args[2] = arg1; | |
1790 | args[3] = arg2; | |
a6e3fa71 JB |
1791 | GCPRO1 (args[0]); |
1792 | gcpro1.nvars = 4; | |
1793 | RETURN_UNGCPRO (Ffuncall (4, args)); | |
db9f0278 | 1794 | #else /* not NO_ARG_ARRAY */ |
a6e3fa71 JB |
1795 | GCPRO1 (fn); |
1796 | gcpro1.nvars = 4; | |
1797 | RETURN_UNGCPRO (Ffuncall (4, &fn)); | |
db9f0278 JB |
1798 | #endif /* not NO_ARG_ARRAY */ |
1799 | } | |
1800 | ||
1801 | DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0, | |
1802 | "Call first argument as a function, passing remaining arguments to it.\n\ | |
1803 | Thus, (funcall 'cons 'x 'y) returns (x . y).") | |
1804 | (nargs, args) | |
1805 | int nargs; | |
1806 | Lisp_Object *args; | |
1807 | { | |
1808 | Lisp_Object fun; | |
1809 | Lisp_Object funcar; | |
1810 | int numargs = nargs - 1; | |
1811 | Lisp_Object lisp_numargs; | |
1812 | Lisp_Object val; | |
1813 | struct backtrace backtrace; | |
1814 | register Lisp_Object *internal_args; | |
1815 | register int i; | |
1816 | ||
1817 | QUIT; | |
1818 | if (consing_since_gc > gc_cons_threshold) | |
a6e3fa71 | 1819 | Fgarbage_collect (); |
db9f0278 JB |
1820 | |
1821 | if (++lisp_eval_depth > max_lisp_eval_depth) | |
1822 | { | |
1823 | if (max_lisp_eval_depth < 100) | |
1824 | max_lisp_eval_depth = 100; | |
1825 | if (lisp_eval_depth > max_lisp_eval_depth) | |
1826 | error ("Lisp nesting exceeds max-lisp-eval-depth"); | |
1827 | } | |
1828 | ||
1829 | backtrace.next = backtrace_list; | |
1830 | backtrace_list = &backtrace; | |
1831 | backtrace.function = &args[0]; | |
1832 | backtrace.args = &args[1]; | |
1833 | backtrace.nargs = nargs - 1; | |
1834 | backtrace.evalargs = 0; | |
1835 | backtrace.debug_on_exit = 0; | |
1836 | ||
1837 | if (debug_on_next_call) | |
1838 | do_debug_on_call (Qlambda); | |
1839 | ||
1840 | retry: | |
1841 | ||
1842 | fun = args[0]; | |
ffd56f97 JB |
1843 | |
1844 | fun = Findirect_function (fun); | |
db9f0278 JB |
1845 | |
1846 | if (XTYPE (fun) == Lisp_Subr) | |
1847 | { | |
1848 | if (numargs < XSUBR (fun)->min_args | |
1849 | || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs)) | |
1850 | { | |
1851 | XFASTINT (lisp_numargs) = numargs; | |
1852 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (lisp_numargs, Qnil))); | |
1853 | } | |
1854 | ||
1855 | if (XSUBR (fun)->max_args == UNEVALLED) | |
1856 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1857 | ||
1858 | if (XSUBR (fun)->max_args == MANY) | |
1859 | { | |
1860 | val = (*XSUBR (fun)->function) (numargs, args + 1); | |
1861 | goto done; | |
1862 | } | |
1863 | ||
1864 | if (XSUBR (fun)->max_args > numargs) | |
1865 | { | |
1866 | internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args * sizeof (Lisp_Object)); | |
1867 | bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object)); | |
1868 | for (i = numargs; i < XSUBR (fun)->max_args; i++) | |
1869 | internal_args[i] = Qnil; | |
1870 | } | |
1871 | else | |
1872 | internal_args = args + 1; | |
1873 | switch (XSUBR (fun)->max_args) | |
1874 | { | |
1875 | case 0: | |
1876 | val = (*XSUBR (fun)->function) (); | |
1877 | goto done; | |
1878 | case 1: | |
1879 | val = (*XSUBR (fun)->function) (internal_args[0]); | |
1880 | goto done; | |
1881 | case 2: | |
1882 | val = (*XSUBR (fun)->function) (internal_args[0], | |
1883 | internal_args[1]); | |
1884 | goto done; | |
1885 | case 3: | |
1886 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
1887 | internal_args[2]); | |
1888 | goto done; | |
1889 | case 4: | |
1890 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
1891 | internal_args[2], | |
1892 | internal_args[3]); | |
1893 | goto done; | |
1894 | case 5: | |
1895 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
1896 | internal_args[2], internal_args[3], | |
1897 | internal_args[4]); | |
1898 | goto done; | |
1899 | case 6: | |
1900 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
1901 | internal_args[2], internal_args[3], | |
1902 | internal_args[4], internal_args[5]); | |
1903 | goto done; | |
15c65264 RS |
1904 | case 7: |
1905 | val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1], | |
1906 | internal_args[2], internal_args[3], | |
1907 | internal_args[4], internal_args[5], | |
1908 | internal_args[6]); | |
1909 | goto done; | |
db9f0278 JB |
1910 | |
1911 | default: | |
70ee42f7 JB |
1912 | |
1913 | /* If a subr takes more than 6 arguments without using MANY | |
1914 | or UNEVALLED, we need to extend this function to support it. | |
1915 | Until this is done, there is no way to call the function. */ | |
1916 | abort (); | |
db9f0278 JB |
1917 | } |
1918 | } | |
1919 | if (XTYPE (fun) == Lisp_Compiled) | |
1920 | val = funcall_lambda (fun, numargs, args + 1); | |
1921 | else | |
1922 | { | |
1923 | if (!CONSP (fun)) | |
1924 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1925 | funcar = Fcar (fun); | |
1926 | if (XTYPE (funcar) != Lisp_Symbol) | |
1927 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1928 | if (EQ (funcar, Qlambda)) | |
1929 | val = funcall_lambda (fun, numargs, args + 1); | |
1930 | else if (EQ (funcar, Qmocklisp)) | |
1931 | val = ml_apply (fun, Flist (numargs, args + 1)); | |
1932 | else if (EQ (funcar, Qautoload)) | |
1933 | { | |
1934 | do_autoload (fun, args[0]); | |
1935 | goto retry; | |
1936 | } | |
1937 | else | |
1938 | return Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
1939 | } | |
1940 | done: | |
1941 | lisp_eval_depth--; | |
1942 | if (backtrace.debug_on_exit) | |
1943 | val = call_debugger (Fcons (Qexit, Fcons (val, Qnil))); | |
1944 | backtrace_list = backtrace.next; | |
1945 | return val; | |
1946 | } | |
1947 | \f | |
1948 | Lisp_Object | |
1949 | apply_lambda (fun, args, eval_flag) | |
1950 | Lisp_Object fun, args; | |
1951 | int eval_flag; | |
1952 | { | |
1953 | Lisp_Object args_left; | |
1954 | Lisp_Object numargs; | |
1955 | register Lisp_Object *arg_vector; | |
1956 | struct gcpro gcpro1, gcpro2, gcpro3; | |
1957 | register int i; | |
1958 | register Lisp_Object tem; | |
1959 | ||
1960 | numargs = Flength (args); | |
1961 | arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object)); | |
1962 | args_left = args; | |
1963 | ||
1964 | GCPRO3 (*arg_vector, args_left, fun); | |
1965 | gcpro1.nvars = 0; | |
1966 | ||
1967 | for (i = 0; i < XINT (numargs);) | |
1968 | { | |
1969 | tem = Fcar (args_left), args_left = Fcdr (args_left); | |
1970 | if (eval_flag) tem = Feval (tem); | |
1971 | arg_vector[i++] = tem; | |
1972 | gcpro1.nvars = i; | |
1973 | } | |
1974 | ||
1975 | UNGCPRO; | |
1976 | ||
1977 | if (eval_flag) | |
1978 | { | |
1979 | backtrace_list->args = arg_vector; | |
1980 | backtrace_list->nargs = i; | |
1981 | } | |
1982 | backtrace_list->evalargs = 0; | |
1983 | tem = funcall_lambda (fun, XINT (numargs), arg_vector); | |
1984 | ||
1985 | /* Do the debug-on-exit now, while arg_vector still exists. */ | |
1986 | if (backtrace_list->debug_on_exit) | |
1987 | tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil))); | |
1988 | /* Don't do it again when we return to eval. */ | |
1989 | backtrace_list->debug_on_exit = 0; | |
1990 | return tem; | |
1991 | } | |
1992 | ||
1993 | /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR | |
1994 | and return the result of evaluation. | |
1995 | FUN must be either a lambda-expression or a compiled-code object. */ | |
1996 | ||
1997 | Lisp_Object | |
1998 | funcall_lambda (fun, nargs, arg_vector) | |
1999 | Lisp_Object fun; | |
2000 | int nargs; | |
2001 | register Lisp_Object *arg_vector; | |
2002 | { | |
2003 | Lisp_Object val, tem; | |
2004 | register Lisp_Object syms_left; | |
2005 | Lisp_Object numargs; | |
2006 | register Lisp_Object next; | |
2007 | int count = specpdl_ptr - specpdl; | |
2008 | register int i; | |
2009 | int optional = 0, rest = 0; | |
2010 | ||
2011 | specbind (Qmocklisp_arguments, Qt); /* t means NOT mocklisp! */ | |
2012 | ||
2013 | XFASTINT (numargs) = nargs; | |
2014 | ||
2015 | if (XTYPE (fun) == Lisp_Cons) | |
2016 | syms_left = Fcar (Fcdr (fun)); | |
2017 | else if (XTYPE (fun) == Lisp_Compiled) | |
2018 | syms_left = XVECTOR (fun)->contents[COMPILED_ARGLIST]; | |
2019 | else abort (); | |
2020 | ||
2021 | i = 0; | |
265a9e55 | 2022 | for (; !NILP (syms_left); syms_left = Fcdr (syms_left)) |
db9f0278 JB |
2023 | { |
2024 | QUIT; | |
2025 | next = Fcar (syms_left); | |
9ffa21d4 JB |
2026 | while (XTYPE (next) != Lisp_Symbol) |
2027 | next = Fsignal (Qinvalid_function, Fcons (fun, Qnil)); | |
db9f0278 JB |
2028 | if (EQ (next, Qand_rest)) |
2029 | rest = 1; | |
2030 | else if (EQ (next, Qand_optional)) | |
2031 | optional = 1; | |
2032 | else if (rest) | |
2033 | { | |
9ffa21d4 | 2034 | specbind (next, Flist (nargs - i, &arg_vector[i])); |
db9f0278 JB |
2035 | i = nargs; |
2036 | } | |
2037 | else if (i < nargs) | |
2038 | { | |
2039 | tem = arg_vector[i++]; | |
2040 | specbind (next, tem); | |
2041 | } | |
2042 | else if (!optional) | |
2043 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
2044 | else | |
2045 | specbind (next, Qnil); | |
2046 | } | |
2047 | ||
2048 | if (i < nargs) | |
2049 | return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil))); | |
2050 | ||
2051 | if (XTYPE (fun) == Lisp_Cons) | |
2052 | val = Fprogn (Fcdr (Fcdr (fun))); | |
2053 | else | |
2054 | val = Fbyte_code (XVECTOR (fun)->contents[COMPILED_BYTECODE], | |
2055 | XVECTOR (fun)->contents[COMPILED_CONSTANTS], | |
2056 | XVECTOR (fun)->contents[COMPILED_STACK_DEPTH]); | |
2057 | return unbind_to (count, val); | |
2058 | } | |
2059 | \f | |
2060 | void | |
2061 | grow_specpdl () | |
2062 | { | |
2063 | register int count = specpdl_ptr - specpdl; | |
2064 | if (specpdl_size >= max_specpdl_size) | |
2065 | { | |
2066 | if (max_specpdl_size < 400) | |
2067 | max_specpdl_size = 400; | |
2068 | if (specpdl_size >= max_specpdl_size) | |
2069 | { | |
debee8fe RS |
2070 | if (!NILP (Vdebug_on_error)) |
2071 | /* Leave room for some specpdl in the debugger. */ | |
2072 | max_specpdl_size = specpdl_size + 100; | |
db9f0278 JB |
2073 | Fsignal (Qerror, |
2074 | Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil)); | |
db9f0278 JB |
2075 | } |
2076 | } | |
2077 | specpdl_size *= 2; | |
2078 | if (specpdl_size > max_specpdl_size) | |
2079 | specpdl_size = max_specpdl_size; | |
2080 | specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof (struct specbinding)); | |
2081 | specpdl_ptr = specpdl + count; | |
2082 | } | |
2083 | ||
2084 | void | |
2085 | specbind (symbol, value) | |
2086 | Lisp_Object symbol, value; | |
2087 | { | |
2088 | extern void store_symval_forwarding (); /* in eval.c */ | |
2089 | Lisp_Object ovalue; | |
2090 | ||
9ffa21d4 JB |
2091 | CHECK_SYMBOL (symbol, 0); |
2092 | ||
db9f0278 JB |
2093 | if (specpdl_ptr == specpdl + specpdl_size) |
2094 | grow_specpdl (); | |
2095 | specpdl_ptr->symbol = symbol; | |
2096 | specpdl_ptr->func = 0; | |
2097 | ovalue = XSYMBOL (symbol)->value; | |
2098 | specpdl_ptr->old_value = EQ (ovalue, Qunbound) ? Qunbound : Fsymbol_value (symbol); | |
2099 | specpdl_ptr++; | |
2100 | if (XTYPE (ovalue) == Lisp_Buffer_Objfwd) | |
2101 | store_symval_forwarding (symbol, ovalue, value); | |
2102 | else | |
2103 | Fset (symbol, value); | |
2104 | } | |
2105 | ||
2106 | void | |
2107 | record_unwind_protect (function, arg) | |
2108 | Lisp_Object (*function)(); | |
2109 | Lisp_Object arg; | |
2110 | { | |
2111 | if (specpdl_ptr == specpdl + specpdl_size) | |
2112 | grow_specpdl (); | |
2113 | specpdl_ptr->func = function; | |
2114 | specpdl_ptr->symbol = Qnil; | |
2115 | specpdl_ptr->old_value = arg; | |
2116 | specpdl_ptr++; | |
2117 | } | |
2118 | ||
2119 | Lisp_Object | |
2120 | unbind_to (count, value) | |
2121 | int count; | |
2122 | Lisp_Object value; | |
2123 | { | |
265a9e55 | 2124 | int quitf = !NILP (Vquit_flag); |
db9f0278 JB |
2125 | struct gcpro gcpro1; |
2126 | ||
2127 | GCPRO1 (value); | |
2128 | ||
2129 | Vquit_flag = Qnil; | |
2130 | ||
2131 | while (specpdl_ptr != specpdl + count) | |
2132 | { | |
2133 | --specpdl_ptr; | |
2134 | if (specpdl_ptr->func != 0) | |
2135 | (*specpdl_ptr->func) (specpdl_ptr->old_value); | |
2136 | /* Note that a "binding" of nil is really an unwind protect, | |
2137 | so in that case the "old value" is a list of forms to evaluate. */ | |
265a9e55 | 2138 | else if (NILP (specpdl_ptr->symbol)) |
db9f0278 JB |
2139 | Fprogn (specpdl_ptr->old_value); |
2140 | else | |
2141 | Fset (specpdl_ptr->symbol, specpdl_ptr->old_value); | |
2142 | } | |
265a9e55 | 2143 | if (NILP (Vquit_flag) && quitf) Vquit_flag = Qt; |
db9f0278 JB |
2144 | |
2145 | UNGCPRO; | |
2146 | ||
2147 | return value; | |
2148 | } | |
2149 | \f | |
2150 | #if 0 | |
2151 | ||
2152 | /* Get the value of symbol's global binding, even if that binding | |
2153 | is not now dynamically visible. */ | |
2154 | ||
2155 | Lisp_Object | |
2156 | top_level_value (symbol) | |
2157 | Lisp_Object symbol; | |
2158 | { | |
2159 | register struct specbinding *ptr = specpdl; | |
2160 | ||
2161 | CHECK_SYMBOL (symbol, 0); | |
2162 | for (; ptr != specpdl_ptr; ptr++) | |
2163 | { | |
2164 | if (EQ (ptr->symbol, symbol)) | |
2165 | return ptr->old_value; | |
2166 | } | |
2167 | return Fsymbol_value (symbol); | |
2168 | } | |
2169 | ||
2170 | Lisp_Object | |
2171 | top_level_set (symbol, newval) | |
2172 | Lisp_Object symbol, newval; | |
2173 | { | |
2174 | register struct specbinding *ptr = specpdl; | |
2175 | ||
2176 | CHECK_SYMBOL (symbol, 0); | |
2177 | for (; ptr != specpdl_ptr; ptr++) | |
2178 | { | |
2179 | if (EQ (ptr->symbol, symbol)) | |
2180 | { | |
2181 | ptr->old_value = newval; | |
2182 | return newval; | |
2183 | } | |
2184 | } | |
2185 | return Fset (symbol, newval); | |
2186 | } | |
2187 | ||
2188 | #endif /* 0 */ | |
2189 | \f | |
2190 | DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0, | |
2191 | "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\ | |
2192 | The debugger is entered when that frame exits, if the flag is non-nil.") | |
2193 | (level, flag) | |
2194 | Lisp_Object level, flag; | |
2195 | { | |
2196 | register struct backtrace *backlist = backtrace_list; | |
2197 | register int i; | |
2198 | ||
2199 | CHECK_NUMBER (level, 0); | |
2200 | ||
2201 | for (i = 0; backlist && i < XINT (level); i++) | |
2202 | { | |
2203 | backlist = backlist->next; | |
2204 | } | |
2205 | ||
2206 | if (backlist) | |
265a9e55 | 2207 | backlist->debug_on_exit = !NILP (flag); |
db9f0278 JB |
2208 | |
2209 | return flag; | |
2210 | } | |
2211 | ||
2212 | DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "", | |
2213 | "Print a trace of Lisp function calls currently active.\n\ | |
2214 | Output stream used is value of `standard-output'.") | |
2215 | () | |
2216 | { | |
2217 | register struct backtrace *backlist = backtrace_list; | |
2218 | register int i; | |
2219 | Lisp_Object tail; | |
2220 | Lisp_Object tem; | |
2221 | extern Lisp_Object Vprint_level; | |
2222 | struct gcpro gcpro1; | |
2223 | ||
db9f0278 JB |
2224 | XFASTINT (Vprint_level) = 3; |
2225 | ||
2226 | tail = Qnil; | |
2227 | GCPRO1 (tail); | |
2228 | ||
2229 | while (backlist) | |
2230 | { | |
2231 | write_string (backlist->debug_on_exit ? "* " : " ", 2); | |
2232 | if (backlist->nargs == UNEVALLED) | |
2233 | { | |
2234 | Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil); | |
2235 | } | |
2236 | else | |
2237 | { | |
2238 | tem = *backlist->function; | |
2239 | Fprin1 (tem, Qnil); /* This can QUIT */ | |
2240 | write_string ("(", -1); | |
2241 | if (backlist->nargs == MANY) | |
2242 | { | |
2243 | for (tail = *backlist->args, i = 0; | |
265a9e55 | 2244 | !NILP (tail); |
db9f0278 JB |
2245 | tail = Fcdr (tail), i++) |
2246 | { | |
2247 | if (i) write_string (" ", -1); | |
2248 | Fprin1 (Fcar (tail), Qnil); | |
2249 | } | |
2250 | } | |
2251 | else | |
2252 | { | |
2253 | for (i = 0; i < backlist->nargs; i++) | |
2254 | { | |
2255 | if (i) write_string (" ", -1); | |
2256 | Fprin1 (backlist->args[i], Qnil); | |
2257 | } | |
2258 | } | |
2259 | } | |
2260 | write_string (")\n", -1); | |
2261 | backlist = backlist->next; | |
2262 | } | |
2263 | ||
2264 | Vprint_level = Qnil; | |
2265 | UNGCPRO; | |
2266 | return Qnil; | |
2267 | } | |
2268 | ||
2269 | DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, "", | |
2270 | "Return the function and arguments N frames up from current execution point.\n\ | |
2271 | If that frame has not evaluated the arguments yet (or is a special form),\n\ | |
2272 | the value is (nil FUNCTION ARG-FORMS...).\n\ | |
2273 | If that frame has evaluated its arguments and called its function already,\n\ | |
2274 | the value is (t FUNCTION ARG-VALUES...).\n\ | |
2275 | A &rest arg is represented as the tail of the list ARG-VALUES.\n\ | |
2276 | FUNCTION is whatever was supplied as car of evaluated list,\n\ | |
2277 | or a lambda expression for macro calls.\n\ | |
2278 | If N is more than the number of frames, the value is nil.") | |
2279 | (nframes) | |
2280 | Lisp_Object nframes; | |
2281 | { | |
2282 | register struct backtrace *backlist = backtrace_list; | |
2283 | register int i; | |
2284 | Lisp_Object tem; | |
2285 | ||
2286 | CHECK_NATNUM (nframes, 0); | |
2287 | ||
2288 | /* Find the frame requested. */ | |
2289 | for (i = 0; i < XFASTINT (nframes); i++) | |
2290 | backlist = backlist->next; | |
2291 | ||
2292 | if (!backlist) | |
2293 | return Qnil; | |
2294 | if (backlist->nargs == UNEVALLED) | |
2295 | return Fcons (Qnil, Fcons (*backlist->function, *backlist->args)); | |
2296 | else | |
2297 | { | |
2298 | if (backlist->nargs == MANY) | |
2299 | tem = *backlist->args; | |
2300 | else | |
2301 | tem = Flist (backlist->nargs, backlist->args); | |
2302 | ||
2303 | return Fcons (Qt, Fcons (*backlist->function, tem)); | |
2304 | } | |
2305 | } | |
2306 | \f | |
2307 | syms_of_eval () | |
2308 | { | |
2309 | DEFVAR_INT ("max-specpdl-size", &max_specpdl_size, | |
2310 | "Limit on number of Lisp variable bindings & unwind-protects before error."); | |
2311 | ||
2312 | DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth, | |
2313 | "Limit on depth in `eval', `apply' and `funcall' before error.\n\ | |
2314 | This limit is to catch infinite recursions for you before they cause\n\ | |
2315 | actual stack overflow in C, which would be fatal for Emacs.\n\ | |
2316 | You can safely make it considerably larger than its default value,\n\ | |
2317 | if that proves inconveniently small."); | |
2318 | ||
2319 | DEFVAR_LISP ("quit-flag", &Vquit_flag, | |
2320 | "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\ | |
2321 | Typing C-G sets `quit-flag' non-nil, regardless of `inhibit-quit'."); | |
2322 | Vquit_flag = Qnil; | |
2323 | ||
2324 | DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit, | |
2325 | "Non-nil inhibits C-g quitting from happening immediately.\n\ | |
2326 | Note that `quit-flag' will still be set by typing C-g,\n\ | |
2327 | so a quit will be signalled as soon as `inhibit-quit' is nil.\n\ | |
2328 | To prevent this happening, set `quit-flag' to nil\n\ | |
2329 | before making `inhibit-quit' nil."); | |
2330 | Vinhibit_quit = Qnil; | |
2331 | ||
ad236261 JB |
2332 | Qinhibit_quit = intern ("inhibit-quit"); |
2333 | staticpro (&Qinhibit_quit); | |
2334 | ||
db9f0278 JB |
2335 | Qautoload = intern ("autoload"); |
2336 | staticpro (&Qautoload); | |
2337 | ||
2338 | Qdebug_on_error = intern ("debug-on-error"); | |
2339 | staticpro (&Qdebug_on_error); | |
2340 | ||
2341 | Qmacro = intern ("macro"); | |
2342 | staticpro (&Qmacro); | |
2343 | ||
2344 | /* Note that the process handling also uses Qexit, but we don't want | |
2345 | to staticpro it twice, so we just do it here. */ | |
2346 | Qexit = intern ("exit"); | |
2347 | staticpro (&Qexit); | |
2348 | ||
2349 | Qinteractive = intern ("interactive"); | |
2350 | staticpro (&Qinteractive); | |
2351 | ||
2352 | Qcommandp = intern ("commandp"); | |
2353 | staticpro (&Qcommandp); | |
2354 | ||
2355 | Qdefun = intern ("defun"); | |
2356 | staticpro (&Qdefun); | |
2357 | ||
2358 | Qand_rest = intern ("&rest"); | |
2359 | staticpro (&Qand_rest); | |
2360 | ||
2361 | Qand_optional = intern ("&optional"); | |
2362 | staticpro (&Qand_optional); | |
2363 | ||
128c0f66 | 2364 | DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error, |
db9f0278 | 2365 | "*Non-nil means automatically display a backtrace buffer\n\ |
128c0f66 RM |
2366 | after any error that is handled by the editor command loop.\n\ |
2367 | If the value is a list, an error only means to display a backtrace\n\ | |
2368 | if one of its condition symbols appears in the list."); | |
2369 | Vstack_trace_on_error = Qnil; | |
db9f0278 | 2370 | |
128c0f66 | 2371 | DEFVAR_LISP ("debug-on-error", &Vdebug_on_error, |
db9f0278 JB |
2372 | "*Non-nil means enter debugger if an error is signaled.\n\ |
2373 | Does not apply to errors handled by `condition-case'.\n\ | |
128c0f66 RM |
2374 | If the value is a list, an error only means to enter the debugger\n\ |
2375 | if one of its condition symbols appears in the list.\n\ | |
db9f0278 | 2376 | See also variable `debug-on-quit'."); |
128c0f66 | 2377 | Vdebug_on_error = Qnil; |
db9f0278 JB |
2378 | |
2379 | DEFVAR_BOOL ("debug-on-quit", &debug_on_quit, | |
2380 | "*Non-nil means enter debugger if quit is signaled (C-G, for example).\n\ | |
1b7d8239 | 2381 | Does not apply if quit is handled by a `condition-case'."); |
db9f0278 JB |
2382 | debug_on_quit = 0; |
2383 | ||
2384 | DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call, | |
2385 | "Non-nil means enter debugger before next `eval', `apply' or `funcall'."); | |
2386 | ||
2387 | DEFVAR_LISP ("debugger", &Vdebugger, | |
2388 | "Function to call to invoke debugger.\n\ | |
2389 | If due to frame exit, args are `exit' and the value being returned;\n\ | |
2390 | this function's value will be returned instead of that.\n\ | |
2391 | If due to error, args are `error' and a list of the args to `signal'.\n\ | |
2392 | If due to `apply' or `funcall' entry, one arg, `lambda'.\n\ | |
2393 | If due to `eval' entry, one arg, t."); | |
2394 | Vdebugger = Qnil; | |
2395 | ||
2396 | Qmocklisp_arguments = intern ("mocklisp-arguments"); | |
2397 | staticpro (&Qmocklisp_arguments); | |
2398 | DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments, | |
2399 | "While in a mocklisp function, the list of its unevaluated args."); | |
2400 | Vmocklisp_arguments = Qt; | |
2401 | ||
2402 | DEFVAR_LISP ("run-hooks", &Vrun_hooks, | |
2403 | "Set to the function `run-hooks', if that function has been defined.\n\ | |
2404 | Otherwise, nil (in a bare Emacs without preloaded Lisp code)."); | |
2405 | Vrun_hooks = Qnil; | |
2406 | ||
2407 | staticpro (&Vautoload_queue); | |
2408 | Vautoload_queue = Qnil; | |
2409 | ||
2410 | defsubr (&Sor); | |
2411 | defsubr (&Sand); | |
2412 | defsubr (&Sif); | |
2413 | defsubr (&Scond); | |
2414 | defsubr (&Sprogn); | |
2415 | defsubr (&Sprog1); | |
2416 | defsubr (&Sprog2); | |
2417 | defsubr (&Ssetq); | |
2418 | defsubr (&Squote); | |
2419 | defsubr (&Sfunction); | |
2420 | defsubr (&Sdefun); | |
2421 | defsubr (&Sdefmacro); | |
2422 | defsubr (&Sdefvar); | |
2423 | defsubr (&Sdefconst); | |
2424 | defsubr (&Suser_variable_p); | |
2425 | defsubr (&Slet); | |
2426 | defsubr (&SletX); | |
2427 | defsubr (&Swhile); | |
2428 | defsubr (&Smacroexpand); | |
2429 | defsubr (&Scatch); | |
2430 | defsubr (&Sthrow); | |
2431 | defsubr (&Sunwind_protect); | |
2432 | defsubr (&Scondition_case); | |
2433 | defsubr (&Ssignal); | |
2434 | defsubr (&Sinteractive_p); | |
2435 | defsubr (&Scommandp); | |
2436 | defsubr (&Sautoload); | |
2437 | defsubr (&Seval); | |
2438 | defsubr (&Sapply); | |
2439 | defsubr (&Sfuncall); | |
2440 | defsubr (&Sbacktrace_debug); | |
2441 | defsubr (&Sbacktrace); | |
2442 | defsubr (&Sbacktrace_frame); | |
2443 | } |