1 /* Evaluator for GNU Emacs Lisp interpreter.
3 Copyright (C) 1985-1987, 1993-1995, 1999-2014 Free Software Foundation,
6 This file is part of GNU Emacs.
8 GNU Emacs is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 GNU Emacs is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
26 #include "blockinput.h"
29 #include "dispextern.h"
31 /* Chain of condition and catch handlers currently in effect. */
33 struct handler
*handlerlist
;
36 /* Count levels of GCPRO to detect failure to UNGCPRO. */
40 Lisp_Object Qautoload
, Qmacro
, Qexit
, Qinteractive
, Qcommandp
;
41 Lisp_Object Qinhibit_quit
;
42 Lisp_Object Qand_rest
;
43 static Lisp_Object Qand_optional
;
44 static Lisp_Object Qinhibit_debugger
;
45 static Lisp_Object Qdeclare
;
46 Lisp_Object Qinternal_interpreter_environment
, Qclosure
;
48 static Lisp_Object Qdebug
;
50 /* This holds either the symbol `run-hooks' or nil.
51 It is nil at an early stage of startup, and when Emacs
54 Lisp_Object Vrun_hooks
;
56 /* Non-nil means record all fset's and provide's, to be undone
57 if the file being autoloaded is not fully loaded.
58 They are recorded by being consed onto the front of Vautoload_queue:
59 (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */
61 Lisp_Object Vautoload_queue
;
63 /* Current number of specbindings allocated in specpdl, not counting
64 the dummy entry specpdl[-1]. */
66 ptrdiff_t specpdl_size
;
68 /* Pointer to beginning of specpdl. A dummy entry specpdl[-1] exists
69 only so that its address can be taken. */
71 union specbinding
*specpdl
;
73 /* Pointer to first unused element in specpdl. */
75 union specbinding
*specpdl_ptr
;
77 /* Depth in Lisp evaluations and function calls. */
79 EMACS_INT lisp_eval_depth
;
81 /* The value of num_nonmacro_input_events as of the last time we
82 started to enter the debugger. If we decide to enter the debugger
83 again when this is still equal to num_nonmacro_input_events, then we
84 know that the debugger itself has an error, and we should just
85 signal the error instead of entering an infinite loop of debugger
88 static EMACS_INT when_entered_debugger
;
90 /* The function from which the last `signal' was called. Set in
92 /* FIXME: We should probably get rid of this! */
93 Lisp_Object Vsignaling_function
;
95 /* If non-nil, Lisp code must not be run since some part of Emacs is
96 in an inconsistent state. Currently, x-create-frame uses this to
97 avoid triggering window-configuration-change-hook while the new
98 frame is half-initialized. */
99 Lisp_Object inhibit_lisp_code
;
101 /* These would ordinarily be static, but they need to be visible to GDB. */
102 bool backtrace_p (union specbinding
*) EXTERNALLY_VISIBLE
;
103 Lisp_Object
*backtrace_args (union specbinding
*) EXTERNALLY_VISIBLE
;
104 Lisp_Object
backtrace_function (union specbinding
*) EXTERNALLY_VISIBLE
;
105 union specbinding
*backtrace_next (union specbinding
*) EXTERNALLY_VISIBLE
;
106 union specbinding
*backtrace_top (void) EXTERNALLY_VISIBLE
;
108 static Lisp_Object
funcall_lambda (Lisp_Object
, ptrdiff_t, Lisp_Object
*);
109 static Lisp_Object
apply_lambda (Lisp_Object fun
, Lisp_Object args
);
112 specpdl_symbol (union specbinding
*pdl
)
114 eassert (pdl
->kind
>= SPECPDL_LET
);
115 return pdl
->let
.symbol
;
119 specpdl_old_value (union specbinding
*pdl
)
121 eassert (pdl
->kind
>= SPECPDL_LET
);
122 return pdl
->let
.old_value
;
126 set_specpdl_old_value (union specbinding
*pdl
, Lisp_Object val
)
128 eassert (pdl
->kind
>= SPECPDL_LET
);
129 pdl
->let
.old_value
= val
;
133 specpdl_where (union specbinding
*pdl
)
135 eassert (pdl
->kind
> SPECPDL_LET
);
136 return pdl
->let
.where
;
140 specpdl_arg (union specbinding
*pdl
)
142 eassert (pdl
->kind
== SPECPDL_UNWIND
);
143 return pdl
->unwind
.arg
;
147 backtrace_function (union specbinding
*pdl
)
149 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
150 return pdl
->bt
.function
;
154 backtrace_nargs (union specbinding
*pdl
)
156 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
157 return pdl
->bt
.nargs
;
161 backtrace_args (union specbinding
*pdl
)
163 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
168 backtrace_debug_on_exit (union specbinding
*pdl
)
170 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
171 return pdl
->bt
.debug_on_exit
;
174 /* Functions to modify slots of backtrace records. */
177 set_backtrace_args (union specbinding
*pdl
, Lisp_Object
*args
)
179 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
184 set_backtrace_nargs (union specbinding
*pdl
, ptrdiff_t n
)
186 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
191 set_backtrace_debug_on_exit (union specbinding
*pdl
, bool doe
)
193 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
194 pdl
->bt
.debug_on_exit
= doe
;
197 /* Helper functions to scan the backtrace. */
200 backtrace_p (union specbinding
*pdl
)
201 { return pdl
>= specpdl
; }
206 union specbinding
*pdl
= specpdl_ptr
- 1;
207 while (backtrace_p (pdl
) && pdl
->kind
!= SPECPDL_BACKTRACE
)
213 backtrace_next (union specbinding
*pdl
)
216 while (backtrace_p (pdl
) && pdl
->kind
!= SPECPDL_BACKTRACE
)
223 init_eval_once (void)
226 union specbinding
*pdlvec
= xmalloc ((size
+ 1) * sizeof *specpdl
);
228 specpdl
= specpdl_ptr
= pdlvec
+ 1;
229 /* Don't forget to update docs (lispref node "Local Variables"). */
230 max_specpdl_size
= 1300; /* 1000 is not enough for CEDET's c-by.el. */
231 max_lisp_eval_depth
= 600;
236 static struct handler handlerlist_sentinel
;
241 specpdl_ptr
= specpdl
;
242 { /* Put a dummy catcher at top-level so that handlerlist is never NULL.
243 This is important since handlerlist->nextfree holds the freelist
244 which would otherwise leak every time we unwind back to top-level. */
246 handlerlist
= handlerlist_sentinel
.nextfree
= &handlerlist_sentinel
;
247 PUSH_HANDLER (c
, Qunbound
, CATCHER
);
248 eassert (c
== &handlerlist_sentinel
);
249 handlerlist_sentinel
.nextfree
= NULL
;
250 handlerlist_sentinel
.next
= NULL
;
253 debug_on_next_call
= 0;
258 /* This is less than the initial value of num_nonmacro_input_events. */
259 when_entered_debugger
= -1;
262 /* Unwind-protect function used by call_debugger. */
265 restore_stack_limits (Lisp_Object data
)
267 max_specpdl_size
= XINT (XCAR (data
));
268 max_lisp_eval_depth
= XINT (XCDR (data
));
271 static void grow_specpdl (void);
273 /* Call the Lisp debugger, giving it argument ARG. */
276 call_debugger (Lisp_Object arg
)
278 bool debug_while_redisplaying
;
279 ptrdiff_t count
= SPECPDL_INDEX ();
281 EMACS_INT old_depth
= max_lisp_eval_depth
;
282 /* Do not allow max_specpdl_size less than actual depth (Bug#16603). */
283 EMACS_INT old_max
= max (max_specpdl_size
, count
);
285 if (lisp_eval_depth
+ 40 > max_lisp_eval_depth
)
286 max_lisp_eval_depth
= lisp_eval_depth
+ 40;
288 /* While debugging Bug#16603, previous value of 100 was found
289 too small to avoid specpdl overflow in the debugger itself. */
290 if (max_specpdl_size
- 200 < count
)
291 max_specpdl_size
= count
+ 200;
293 if (old_max
== count
)
295 /* We can enter the debugger due to specpdl overflow (Bug#16603). */
300 /* Restore limits after leaving the debugger. */
301 record_unwind_protect (restore_stack_limits
,
302 Fcons (make_number (old_max
),
303 make_number (old_depth
)));
305 #ifdef HAVE_WINDOW_SYSTEM
306 if (display_hourglass_p
)
310 debug_on_next_call
= 0;
311 when_entered_debugger
= num_nonmacro_input_events
;
313 /* Resetting redisplaying_p to 0 makes sure that debug output is
314 displayed if the debugger is invoked during redisplay. */
315 debug_while_redisplaying
= redisplaying_p
;
317 specbind (intern ("debugger-may-continue"),
318 debug_while_redisplaying
? Qnil
: Qt
);
319 specbind (Qinhibit_redisplay
, Qnil
);
320 specbind (Qinhibit_debugger
, Qt
);
322 #if 0 /* Binding this prevents execution of Lisp code during
323 redisplay, which necessarily leads to display problems. */
324 specbind (Qinhibit_eval_during_redisplay
, Qt
);
327 val
= apply1 (Vdebugger
, arg
);
329 /* Interrupting redisplay and resuming it later is not safe under
330 all circumstances. So, when the debugger returns, abort the
331 interrupted redisplay by going back to the top-level. */
332 if (debug_while_redisplaying
)
335 return unbind_to (count
, val
);
339 do_debug_on_call (Lisp_Object code
)
341 debug_on_next_call
= 0;
342 set_backtrace_debug_on_exit (specpdl_ptr
- 1, true);
343 call_debugger (list1 (code
));
346 /* NOTE!!! Every function that can call EVAL must protect its args
347 and temporaries from garbage collection while it needs them.
348 The definition of `For' shows what you have to do. */
350 DEFUN ("or", For
, Sor
, 0, UNEVALLED
, 0,
351 doc
: /* Eval args until one of them yields non-nil, then return that value.
352 The remaining args are not evalled at all.
353 If all args return nil, return nil.
354 usage: (or CONDITIONS...) */)
357 register Lisp_Object val
= Qnil
;
364 val
= eval_sub (XCAR (args
));
374 DEFUN ("and", Fand
, Sand
, 0, UNEVALLED
, 0,
375 doc
: /* Eval args until one of them yields nil, then return nil.
376 The remaining args are not evalled at all.
377 If no arg yields nil, return the last arg's value.
378 usage: (and CONDITIONS...) */)
381 register Lisp_Object val
= Qt
;
388 val
= eval_sub (XCAR (args
));
398 DEFUN ("if", Fif
, Sif
, 2, UNEVALLED
, 0,
399 doc
: /* If COND yields non-nil, do THEN, else do ELSE...
400 Returns the value of THEN or the value of the last of the ELSE's.
401 THEN must be one expression, but ELSE... can be zero or more expressions.
402 If COND yields nil, and there are no ELSE's, the value is nil.
403 usage: (if COND THEN ELSE...) */)
410 cond
= eval_sub (XCAR (args
));
414 return eval_sub (Fcar (XCDR (args
)));
415 return Fprogn (XCDR (XCDR (args
)));
418 DEFUN ("cond", Fcond
, Scond
, 0, UNEVALLED
, 0,
419 doc
: /* Try each clause until one succeeds.
420 Each clause looks like (CONDITION BODY...). CONDITION is evaluated
421 and, if the value is non-nil, this clause succeeds:
422 then the expressions in BODY are evaluated and the last one's
423 value is the value of the cond-form.
424 If a clause has one element, as in (CONDITION), then the cond-form
425 returns CONDITION's value, if that is non-nil.
426 If no clause succeeds, cond returns nil.
427 usage: (cond CLAUSES...) */)
430 Lisp_Object val
= args
;
436 Lisp_Object clause
= XCAR (args
);
437 val
= eval_sub (Fcar (clause
));
440 if (!NILP (XCDR (clause
)))
441 val
= Fprogn (XCDR (clause
));
451 DEFUN ("progn", Fprogn
, Sprogn
, 0, UNEVALLED
, 0,
452 doc
: /* Eval BODY forms sequentially and return value of last one.
453 usage: (progn BODY...) */)
456 Lisp_Object val
= Qnil
;
463 val
= eval_sub (XCAR (body
));
471 /* Evaluate BODY sequentially, discarding its value. Suitable for
472 record_unwind_protect. */
475 unwind_body (Lisp_Object body
)
480 DEFUN ("prog1", Fprog1
, Sprog1
, 1, UNEVALLED
, 0,
481 doc
: /* Eval FIRST and BODY sequentially; return value from FIRST.
482 The value of FIRST is saved during the evaluation of the remaining args,
483 whose values are discarded.
484 usage: (prog1 FIRST BODY...) */)
488 Lisp_Object args_left
;
489 struct gcpro gcpro1
, gcpro2
;
495 val
= eval_sub (XCAR (args_left
));
496 while (CONSP (args_left
= XCDR (args_left
)))
497 eval_sub (XCAR (args_left
));
503 DEFUN ("prog2", Fprog2
, Sprog2
, 2, UNEVALLED
, 0,
504 doc
: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2.
505 The value of FORM2 is saved during the evaluation of the
506 remaining args, whose values are discarded.
507 usage: (prog2 FORM1 FORM2 BODY...) */)
513 eval_sub (XCAR (args
));
515 return Fprog1 (XCDR (args
));
518 DEFUN ("setq", Fsetq
, Ssetq
, 0, UNEVALLED
, 0,
519 doc
: /* Set each SYM to the value of its VAL.
520 The symbols SYM are variables; they are literal (not evaluated).
521 The values VAL are expressions; they are evaluated.
522 Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.
523 The second VAL is not computed until after the first SYM is set, and so on;
524 each VAL can use the new value of variables set earlier in the `setq'.
525 The return value of the `setq' form is the value of the last VAL.
526 usage: (setq [SYM VAL]...) */)
529 Lisp_Object val
, sym
, lex_binding
;
534 Lisp_Object args_left
= args
;
540 val
= eval_sub (Fcar (XCDR (args_left
)));
541 sym
= XCAR (args_left
);
543 /* Like for eval_sub, we do not check declared_special here since
544 it's been done when let-binding. */
545 if (!NILP (Vinternal_interpreter_environment
) /* Mere optimization! */
547 && !NILP (lex_binding
548 = Fassq (sym
, Vinternal_interpreter_environment
)))
549 XSETCDR (lex_binding
, val
); /* SYM is lexically bound. */
551 Fset (sym
, val
); /* SYM is dynamically bound. */
553 args_left
= Fcdr (XCDR (args_left
));
555 while (CONSP (args_left
));
563 DEFUN ("quote", Fquote
, Squote
, 1, UNEVALLED
, 0,
564 doc
: /* Return the argument, without evaluating it. `(quote x)' yields `x'.
565 Warning: `quote' does not construct its return value, but just returns
566 the value that was pre-constructed by the Lisp reader (see info node
567 `(elisp)Printed Representation').
568 This means that '(a . b) is not identical to (cons 'a 'b): the former
569 does not cons. Quoting should be reserved for constants that will
570 never be modified by side-effects, unless you like self-modifying code.
571 See the common pitfall in info node `(elisp)Rearrangement' for an example
572 of unexpected results when a quoted object is modified.
573 usage: (quote ARG) */)
576 if (CONSP (XCDR (args
)))
577 xsignal2 (Qwrong_number_of_arguments
, Qquote
, Flength (args
));
581 DEFUN ("function", Ffunction
, Sfunction
, 1, UNEVALLED
, 0,
582 doc
: /* Like `quote', but preferred for objects which are functions.
583 In byte compilation, `function' causes its argument to be compiled.
584 `quote' cannot do that.
585 usage: (function ARG) */)
588 Lisp_Object quoted
= XCAR (args
);
590 if (CONSP (XCDR (args
)))
591 xsignal2 (Qwrong_number_of_arguments
, Qfunction
, Flength (args
));
593 if (!NILP (Vinternal_interpreter_environment
)
595 && EQ (XCAR (quoted
), Qlambda
))
596 /* This is a lambda expression within a lexical environment;
597 return an interpreted closure instead of a simple lambda. */
598 return Fcons (Qclosure
, Fcons (Vinternal_interpreter_environment
,
601 /* Simply quote the argument. */
606 DEFUN ("defvaralias", Fdefvaralias
, Sdefvaralias
, 2, 3, 0,
607 doc
: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE.
608 Aliased variables always have the same value; setting one sets the other.
609 Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is
610 omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE,
611 or of the variable at the end of the chain of aliases, if BASE-VARIABLE is
612 itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not,
613 then the value of BASE-VARIABLE is set to that of NEW-ALIAS.
614 The return value is BASE-VARIABLE. */)
615 (Lisp_Object new_alias
, Lisp_Object base_variable
, Lisp_Object docstring
)
617 struct Lisp_Symbol
*sym
;
619 CHECK_SYMBOL (new_alias
);
620 CHECK_SYMBOL (base_variable
);
622 sym
= XSYMBOL (new_alias
);
625 /* Not sure why, but why not? */
626 error ("Cannot make a constant an alias");
628 switch (sym
->redirect
)
630 case SYMBOL_FORWARDED
:
631 error ("Cannot make an internal variable an alias");
632 case SYMBOL_LOCALIZED
:
633 error ("Don't know how to make a localized variable an alias");
636 /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html
637 If n_a is bound, but b_v is not, set the value of b_v to n_a,
638 so that old-code that affects n_a before the aliasing is setup
640 if (NILP (Fboundp (base_variable
)))
641 set_internal (base_variable
, find_symbol_value (new_alias
), Qnil
, 1);
644 union specbinding
*p
;
646 for (p
= specpdl_ptr
; p
> specpdl
; )
647 if ((--p
)->kind
>= SPECPDL_LET
648 && (EQ (new_alias
, specpdl_symbol (p
))))
649 error ("Don't know how to make a let-bound variable an alias");
652 sym
->declared_special
= 1;
653 XSYMBOL (base_variable
)->declared_special
= 1;
654 sym
->redirect
= SYMBOL_VARALIAS
;
655 SET_SYMBOL_ALIAS (sym
, XSYMBOL (base_variable
));
656 sym
->constant
= SYMBOL_CONSTANT_P (base_variable
);
657 LOADHIST_ATTACH (new_alias
);
658 /* Even if docstring is nil: remove old docstring. */
659 Fput (new_alias
, Qvariable_documentation
, docstring
);
661 return base_variable
;
664 static union specbinding
*
665 default_toplevel_binding (Lisp_Object symbol
)
667 union specbinding
*binding
= NULL
;
668 union specbinding
*pdl
= specpdl_ptr
;
669 while (pdl
> specpdl
)
671 switch ((--pdl
)->kind
)
673 case SPECPDL_LET_DEFAULT
:
675 if (EQ (specpdl_symbol (pdl
), symbol
))
683 DEFUN ("default-toplevel-value", Fdefault_toplevel_value
, Sdefault_toplevel_value
, 1, 1, 0,
684 doc
: /* Return SYMBOL's toplevel default value.
685 "Toplevel" means outside of any let binding. */)
688 union specbinding
*binding
= default_toplevel_binding (symbol
);
690 = binding
? specpdl_old_value (binding
) : Fdefault_value (symbol
);
691 if (!EQ (value
, Qunbound
))
693 xsignal1 (Qvoid_variable
, symbol
);
696 DEFUN ("set-default-toplevel-value", Fset_default_toplevel_value
,
697 Sset_default_toplevel_value
, 2, 2, 0,
698 doc
: /* Set SYMBOL's toplevel default value to VALUE.
699 "Toplevel" means outside of any let binding. */)
700 (Lisp_Object symbol
, Lisp_Object value
)
702 union specbinding
*binding
= default_toplevel_binding (symbol
);
704 set_specpdl_old_value (binding
, value
);
706 Fset_default (symbol
, value
);
710 DEFUN ("defvar", Fdefvar
, Sdefvar
, 1, UNEVALLED
, 0,
711 doc
: /* Define SYMBOL as a variable, and return SYMBOL.
712 You are not required to define a variable in order to use it, but
713 defining it lets you supply an initial value and documentation, which
714 can be referred to by the Emacs help facilities and other programming
715 tools. The `defvar' form also declares the variable as \"special\",
716 so that it is always dynamically bound even if `lexical-binding' is t.
718 The optional argument INITVALUE is evaluated, and used to set SYMBOL,
719 only if SYMBOL's value is void. If SYMBOL is buffer-local, its
720 default value is what is set; buffer-local values are not affected.
721 If INITVALUE is missing, SYMBOL's value is not set.
723 If SYMBOL has a local binding, then this form affects the local
724 binding. This is usually not what you want. Thus, if you need to
725 load a file defining variables, with this form or with `defconst' or
726 `defcustom', you should always load that file _outside_ any bindings
727 for these variables. \(`defconst' and `defcustom' behave similarly in
730 The optional argument DOCSTRING is a documentation string for the
733 To define a user option, use `defcustom' instead of `defvar'.
734 usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */)
737 Lisp_Object sym
, tem
, tail
;
744 if (CONSP (XCDR (tail
)) && CONSP (XCDR (XCDR (tail
))))
745 error ("Too many arguments");
747 tem
= Fdefault_boundp (sym
);
749 /* Do it before evaluating the initial value, for self-references. */
750 XSYMBOL (sym
)->declared_special
= 1;
753 Fset_default (sym
, eval_sub (XCAR (tail
)));
755 { /* Check if there is really a global binding rather than just a let
756 binding that shadows the global unboundness of the var. */
757 union specbinding
*binding
= default_toplevel_binding (sym
);
758 if (binding
&& EQ (specpdl_old_value (binding
), Qunbound
))
760 set_specpdl_old_value (binding
, eval_sub (XCAR (tail
)));
767 if (!NILP (Vpurify_flag
))
768 tem
= Fpurecopy (tem
);
769 Fput (sym
, Qvariable_documentation
, tem
);
771 LOADHIST_ATTACH (sym
);
773 else if (!NILP (Vinternal_interpreter_environment
)
774 && !XSYMBOL (sym
)->declared_special
)
775 /* A simple (defvar foo) with lexical scoping does "nothing" except
776 declare that var to be dynamically scoped *locally* (i.e. within
777 the current file or let-block). */
778 Vinternal_interpreter_environment
779 = Fcons (sym
, Vinternal_interpreter_environment
);
782 /* Simple (defvar <var>) should not count as a definition at all.
783 It could get in the way of other definitions, and unloading this
784 package could try to make the variable unbound. */
790 DEFUN ("defconst", Fdefconst
, Sdefconst
, 2, UNEVALLED
, 0,
791 doc
: /* Define SYMBOL as a constant variable.
792 This declares that neither programs nor users should ever change the
793 value. This constancy is not actually enforced by Emacs Lisp, but
794 SYMBOL is marked as a special variable so that it is never lexically
797 The `defconst' form always sets the value of SYMBOL to the result of
798 evalling INITVALUE. If SYMBOL is buffer-local, its default value is
799 what is set; buffer-local values are not affected. If SYMBOL has a
800 local binding, then this form sets the local binding's value.
801 However, you should normally not make local bindings for variables
802 defined with this form.
804 The optional DOCSTRING specifies the variable's documentation string.
805 usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */)
808 Lisp_Object sym
, tem
;
811 if (CONSP (Fcdr (XCDR (XCDR (args
)))))
812 error ("Too many arguments");
814 tem
= eval_sub (Fcar (XCDR (args
)));
815 if (!NILP (Vpurify_flag
))
816 tem
= Fpurecopy (tem
);
817 Fset_default (sym
, tem
);
818 XSYMBOL (sym
)->declared_special
= 1;
819 tem
= Fcar (XCDR (XCDR (args
)));
822 if (!NILP (Vpurify_flag
))
823 tem
= Fpurecopy (tem
);
824 Fput (sym
, Qvariable_documentation
, tem
);
826 Fput (sym
, Qrisky_local_variable
, Qt
);
827 LOADHIST_ATTACH (sym
);
831 /* Make SYMBOL lexically scoped. */
832 DEFUN ("internal-make-var-non-special", Fmake_var_non_special
,
833 Smake_var_non_special
, 1, 1, 0,
834 doc
: /* Internal function. */)
837 CHECK_SYMBOL (symbol
);
838 XSYMBOL (symbol
)->declared_special
= 0;
843 DEFUN ("let*", FletX
, SletX
, 1, UNEVALLED
, 0,
844 doc
: /* Bind variables according to VARLIST then eval BODY.
845 The value of the last form in BODY is returned.
846 Each element of VARLIST is a symbol (which is bound to nil)
847 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
848 Each VALUEFORM can refer to the symbols already bound by this VARLIST.
849 usage: (let* VARLIST BODY...) */)
852 Lisp_Object varlist
, var
, val
, elt
, lexenv
;
853 ptrdiff_t count
= SPECPDL_INDEX ();
854 struct gcpro gcpro1
, gcpro2
, gcpro3
;
856 GCPRO3 (args
, elt
, varlist
);
858 lexenv
= Vinternal_interpreter_environment
;
860 varlist
= XCAR (args
);
861 while (CONSP (varlist
))
865 elt
= XCAR (varlist
);
871 else if (! NILP (Fcdr (Fcdr (elt
))))
872 signal_error ("`let' bindings can have only one value-form", elt
);
876 val
= eval_sub (Fcar (Fcdr (elt
)));
879 if (!NILP (lexenv
) && SYMBOLP (var
)
880 && !XSYMBOL (var
)->declared_special
881 && NILP (Fmemq (var
, Vinternal_interpreter_environment
)))
882 /* Lexically bind VAR by adding it to the interpreter's binding
886 = Fcons (Fcons (var
, val
), Vinternal_interpreter_environment
);
887 if (EQ (Vinternal_interpreter_environment
, lexenv
))
888 /* Save the old lexical environment on the specpdl stack,
889 but only for the first lexical binding, since we'll never
890 need to revert to one of the intermediate ones. */
891 specbind (Qinternal_interpreter_environment
, newenv
);
893 Vinternal_interpreter_environment
= newenv
;
898 varlist
= XCDR (varlist
);
901 val
= Fprogn (XCDR (args
));
902 return unbind_to (count
, val
);
905 DEFUN ("let", Flet
, Slet
, 1, UNEVALLED
, 0,
906 doc
: /* Bind variables according to VARLIST then eval BODY.
907 The value of the last form in BODY is returned.
908 Each element of VARLIST is a symbol (which is bound to nil)
909 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
910 All the VALUEFORMs are evalled before any symbols are bound.
911 usage: (let VARLIST BODY...) */)
914 Lisp_Object
*temps
, tem
, lexenv
;
915 register Lisp_Object elt
, varlist
;
916 ptrdiff_t count
= SPECPDL_INDEX ();
918 struct gcpro gcpro1
, gcpro2
;
921 varlist
= XCAR (args
);
923 /* Make space to hold the values to give the bound variables. */
924 elt
= Flength (varlist
);
925 SAFE_ALLOCA_LISP (temps
, XFASTINT (elt
));
927 /* Compute the values and store them in `temps'. */
929 GCPRO2 (args
, *temps
);
932 for (argnum
= 0; CONSP (varlist
); varlist
= XCDR (varlist
))
935 elt
= XCAR (varlist
);
937 temps
[argnum
++] = Qnil
;
938 else if (! NILP (Fcdr (Fcdr (elt
))))
939 signal_error ("`let' bindings can have only one value-form", elt
);
941 temps
[argnum
++] = eval_sub (Fcar (Fcdr (elt
)));
942 gcpro2
.nvars
= argnum
;
946 lexenv
= Vinternal_interpreter_environment
;
948 varlist
= XCAR (args
);
949 for (argnum
= 0; CONSP (varlist
); varlist
= XCDR (varlist
))
953 elt
= XCAR (varlist
);
954 var
= SYMBOLP (elt
) ? elt
: Fcar (elt
);
955 tem
= temps
[argnum
++];
957 if (!NILP (lexenv
) && SYMBOLP (var
)
958 && !XSYMBOL (var
)->declared_special
959 && NILP (Fmemq (var
, Vinternal_interpreter_environment
)))
960 /* Lexically bind VAR by adding it to the lexenv alist. */
961 lexenv
= Fcons (Fcons (var
, tem
), lexenv
);
963 /* Dynamically bind VAR. */
967 if (!EQ (lexenv
, Vinternal_interpreter_environment
))
968 /* Instantiate a new lexical environment. */
969 specbind (Qinternal_interpreter_environment
, lexenv
);
971 elt
= Fprogn (XCDR (args
));
973 return unbind_to (count
, elt
);
976 DEFUN ("while", Fwhile
, Swhile
, 1, UNEVALLED
, 0,
977 doc
: /* If TEST yields non-nil, eval BODY... and repeat.
978 The order of execution is thus TEST, BODY, TEST, BODY and so on
979 until TEST returns nil.
980 usage: (while TEST BODY...) */)
983 Lisp_Object test
, body
;
984 struct gcpro gcpro1
, gcpro2
;
990 while (!NILP (eval_sub (test
)))
1000 DEFUN ("macroexpand", Fmacroexpand
, Smacroexpand
, 1, 2, 0,
1001 doc
: /* Return result of expanding macros at top level of FORM.
1002 If FORM is not a macro call, it is returned unchanged.
1003 Otherwise, the macro is expanded and the expansion is considered
1004 in place of FORM. When a non-macro-call results, it is returned.
1006 The second optional arg ENVIRONMENT specifies an environment of macro
1007 definitions to shadow the loaded ones for use in file byte-compilation. */)
1008 (Lisp_Object form
, Lisp_Object environment
)
1010 /* With cleanups from Hallvard Furuseth. */
1011 register Lisp_Object expander
, sym
, def
, tem
;
1015 /* Come back here each time we expand a macro call,
1016 in case it expands into another macro call. */
1019 /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */
1020 def
= sym
= XCAR (form
);
1022 /* Trace symbols aliases to other symbols
1023 until we get a symbol that is not an alias. */
1024 while (SYMBOLP (def
))
1028 tem
= Fassq (sym
, environment
);
1031 def
= XSYMBOL (sym
)->function
;
1037 /* Right now TEM is the result from SYM in ENVIRONMENT,
1038 and if TEM is nil then DEF is SYM's function definition. */
1041 /* SYM is not mentioned in ENVIRONMENT.
1042 Look at its function definition. */
1043 struct gcpro gcpro1
;
1045 def
= Fautoload_do_load (def
, sym
, Qmacro
);
1048 /* Not defined or definition not suitable. */
1050 if (!EQ (XCAR (def
), Qmacro
))
1052 else expander
= XCDR (def
);
1056 expander
= XCDR (tem
);
1057 if (NILP (expander
))
1061 Lisp_Object newform
= apply1 (expander
, XCDR (form
));
1062 if (EQ (form
, newform
))
1071 DEFUN ("catch", Fcatch
, Scatch
, 1, UNEVALLED
, 0,
1072 doc
: /* Eval BODY allowing nonlocal exits using `throw'.
1073 TAG is evalled to get the tag to use; it must not be nil.
1075 Then the BODY is executed.
1076 Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'.
1077 If no throw happens, `catch' returns the value of the last BODY form.
1078 If a throw happens, it specifies the value to return from `catch'.
1079 usage: (catch TAG BODY...) */)
1082 register Lisp_Object tag
;
1083 struct gcpro gcpro1
;
1086 tag
= eval_sub (XCAR (args
));
1088 return internal_catch (tag
, Fprogn
, XCDR (args
));
1091 /* Assert that E is true, as a comment only. Use this instead of
1092 eassert (E) when E contains variables that might be clobbered by a
1095 #define clobbered_eassert(E) ((void) 0)
1097 /* Set up a catch, then call C function FUNC on argument ARG.
1098 FUNC should return a Lisp_Object.
1099 This is how catches are done from within C code. */
1102 internal_catch (Lisp_Object tag
, Lisp_Object (*func
) (Lisp_Object
), Lisp_Object arg
)
1104 /* This structure is made part of the chain `catchlist'. */
1107 /* Fill in the components of c, and put it on the list. */
1108 PUSH_HANDLER (c
, tag
, CATCHER
);
1111 if (! sys_setjmp (c
->jmp
))
1113 Lisp_Object val
= (*func
) (arg
);
1114 clobbered_eassert (handlerlist
== c
);
1115 handlerlist
= handlerlist
->next
;
1119 { /* Throw works by a longjmp that comes right here. */
1120 Lisp_Object val
= handlerlist
->val
;
1121 clobbered_eassert (handlerlist
== c
);
1122 handlerlist
= handlerlist
->next
;
1127 /* Unwind the specbind, catch, and handler stacks back to CATCH, and
1128 jump to that CATCH, returning VALUE as the value of that catch.
1130 This is the guts of Fthrow and Fsignal; they differ only in the way
1131 they choose the catch tag to throw to. A catch tag for a
1132 condition-case form has a TAG of Qnil.
1134 Before each catch is discarded, unbind all special bindings and
1135 execute all unwind-protect clauses made above that catch. Unwind
1136 the handler stack as we go, so that the proper handlers are in
1137 effect for each unwind-protect clause we run. At the end, restore
1138 some static info saved in CATCH, and longjmp to the location
1141 This is used for correct unwinding in Fthrow and Fsignal. */
1143 static _Noreturn
void
1144 unwind_to_catch (struct handler
*catch, Lisp_Object value
)
1148 eassert (catch->next
);
1150 /* Save the value in the tag. */
1153 /* Restore certain special C variables. */
1154 set_poll_suppress_count (catch->poll_suppress_count
);
1155 unblock_input_to (catch->interrupt_input_blocked
);
1160 /* Unwind the specpdl stack, and then restore the proper set of
1162 unbind_to (handlerlist
->pdlcount
, Qnil
);
1163 last_time
= handlerlist
== catch;
1165 handlerlist
= handlerlist
->next
;
1167 while (! last_time
);
1169 eassert (handlerlist
== catch);
1171 gcprolist
= catch->gcpro
;
1173 gcpro_level
= gcprolist
? gcprolist
->level
+ 1 : 0;
1175 lisp_eval_depth
= catch->lisp_eval_depth
;
1177 sys_longjmp (catch->jmp
, 1);
1180 DEFUN ("throw", Fthrow
, Sthrow
, 2, 2, 0,
1181 doc
: /* Throw to the catch for TAG and return VALUE from it.
1182 Both TAG and VALUE are evalled. */)
1183 (register Lisp_Object tag
, Lisp_Object value
)
1188 for (c
= handlerlist
; c
; c
= c
->next
)
1190 if (c
->type
== CATCHER
&& EQ (c
->tag_or_ch
, tag
))
1191 unwind_to_catch (c
, value
);
1193 xsignal2 (Qno_catch
, tag
, value
);
1197 DEFUN ("unwind-protect", Funwind_protect
, Sunwind_protect
, 1, UNEVALLED
, 0,
1198 doc
: /* Do BODYFORM, protecting with UNWINDFORMS.
1199 If BODYFORM completes normally, its value is returned
1200 after executing the UNWINDFORMS.
1201 If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.
1202 usage: (unwind-protect BODYFORM UNWINDFORMS...) */)
1206 ptrdiff_t count
= SPECPDL_INDEX ();
1208 record_unwind_protect (unwind_body
, XCDR (args
));
1209 val
= eval_sub (XCAR (args
));
1210 return unbind_to (count
, val
);
1213 DEFUN ("condition-case", Fcondition_case
, Scondition_case
, 2, UNEVALLED
, 0,
1214 doc
: /* Regain control when an error is signaled.
1215 Executes BODYFORM and returns its value if no error happens.
1216 Each element of HANDLERS looks like (CONDITION-NAME BODY...)
1217 where the BODY is made of Lisp expressions.
1219 A handler is applicable to an error
1220 if CONDITION-NAME is one of the error's condition names.
1221 If an error happens, the first applicable handler is run.
1223 The car of a handler may be a list of condition names instead of a
1224 single condition name; then it handles all of them. If the special
1225 condition name `debug' is present in this list, it allows another
1226 condition in the list to run the debugger if `debug-on-error' and the
1227 other usual mechanisms says it should (otherwise, `condition-case'
1228 suppresses the debugger).
1230 When a handler handles an error, control returns to the `condition-case'
1231 and it executes the handler's BODY...
1232 with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error.
1233 \(If VAR is nil, the handler can't access that information.)
1234 Then the value of the last BODY form is returned from the `condition-case'
1237 See also the function `signal' for more info.
1238 usage: (condition-case VAR BODYFORM &rest HANDLERS) */)
1241 Lisp_Object var
= XCAR (args
);
1242 Lisp_Object bodyform
= XCAR (XCDR (args
));
1243 Lisp_Object handlers
= XCDR (XCDR (args
));
1245 return internal_lisp_condition_case (var
, bodyform
, handlers
);
1248 /* Like Fcondition_case, but the args are separate
1249 rather than passed in a list. Used by Fbyte_code. */
1252 internal_lisp_condition_case (volatile Lisp_Object var
, Lisp_Object bodyform
,
1253 Lisp_Object handlers
)
1257 struct handler
*oldhandlerlist
= handlerlist
;
1262 for (val
= handlers
; CONSP (val
); val
= XCDR (val
))
1264 Lisp_Object tem
= XCAR (val
);
1268 && (SYMBOLP (XCAR (tem
))
1269 || CONSP (XCAR (tem
))))))
1270 error ("Invalid condition handler: %s",
1271 SDATA (Fprin1_to_string (tem
, Qt
)));
1274 { /* The first clause is the one that should be checked first, so it should
1275 be added to handlerlist last. So we build in `clauses' a table that
1276 contains `handlers' but in reverse order. */
1277 Lisp_Object
*clauses
= alloca (clausenb
* sizeof (Lisp_Object
*));
1278 Lisp_Object
*volatile clauses_volatile
= clauses
;
1280 for (val
= handlers
; CONSP (val
); val
= XCDR (val
))
1281 clauses
[--i
] = XCAR (val
);
1282 for (i
= 0; i
< clausenb
; i
++)
1284 Lisp_Object clause
= clauses
[i
];
1285 Lisp_Object condition
= XCAR (clause
);
1286 if (!CONSP (condition
))
1287 condition
= Fcons (condition
, Qnil
);
1288 PUSH_HANDLER (c
, condition
, CONDITION_CASE
);
1289 if (sys_setjmp (c
->jmp
))
1291 ptrdiff_t count
= SPECPDL_INDEX ();
1292 Lisp_Object val
= handlerlist
->val
;
1293 Lisp_Object
*chosen_clause
= clauses_volatile
;
1294 for (c
= handlerlist
->next
; c
!= oldhandlerlist
; c
= c
->next
)
1296 handlerlist
= oldhandlerlist
;
1299 if (!NILP (Vinternal_interpreter_environment
))
1300 specbind (Qinternal_interpreter_environment
,
1301 Fcons (Fcons (var
, val
),
1302 Vinternal_interpreter_environment
));
1304 specbind (var
, val
);
1306 val
= Fprogn (XCDR (*chosen_clause
));
1307 /* Note that this just undoes the binding of var; whoever
1308 longjumped to us unwound the stack to c.pdlcount before
1311 unbind_to (count
, Qnil
);
1317 val
= eval_sub (bodyform
);
1318 handlerlist
= oldhandlerlist
;
1322 /* Call the function BFUN with no arguments, catching errors within it
1323 according to HANDLERS. If there is an error, call HFUN with
1324 one argument which is the data that describes the error:
1327 HANDLERS can be a list of conditions to catch.
1328 If HANDLERS is Qt, catch all errors.
1329 If HANDLERS is Qerror, catch all errors
1330 but allow the debugger to run if that is enabled. */
1333 internal_condition_case (Lisp_Object (*bfun
) (void), Lisp_Object handlers
,
1334 Lisp_Object (*hfun
) (Lisp_Object
))
1339 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1340 if (sys_setjmp (c
->jmp
))
1342 Lisp_Object val
= handlerlist
->val
;
1343 clobbered_eassert (handlerlist
== c
);
1344 handlerlist
= handlerlist
->next
;
1345 return (*hfun
) (val
);
1349 clobbered_eassert (handlerlist
== c
);
1350 handlerlist
= handlerlist
->next
;
1354 /* Like internal_condition_case but call BFUN with ARG as its argument. */
1357 internal_condition_case_1 (Lisp_Object (*bfun
) (Lisp_Object
), Lisp_Object arg
,
1358 Lisp_Object handlers
, Lisp_Object (*hfun
) (Lisp_Object
))
1363 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1364 if (sys_setjmp (c
->jmp
))
1366 Lisp_Object val
= handlerlist
->val
;
1367 clobbered_eassert (handlerlist
== c
);
1368 handlerlist
= handlerlist
->next
;
1369 return (*hfun
) (val
);
1372 val
= (*bfun
) (arg
);
1373 clobbered_eassert (handlerlist
== c
);
1374 handlerlist
= handlerlist
->next
;
1378 /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as
1382 internal_condition_case_2 (Lisp_Object (*bfun
) (Lisp_Object
, Lisp_Object
),
1385 Lisp_Object handlers
,
1386 Lisp_Object (*hfun
) (Lisp_Object
))
1391 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1392 if (sys_setjmp (c
->jmp
))
1394 Lisp_Object val
= handlerlist
->val
;
1395 clobbered_eassert (handlerlist
== c
);
1396 handlerlist
= handlerlist
->next
;
1397 return (*hfun
) (val
);
1400 val
= (*bfun
) (arg1
, arg2
);
1401 clobbered_eassert (handlerlist
== c
);
1402 handlerlist
= handlerlist
->next
;
1406 /* Like internal_condition_case but call BFUN with NARGS as first,
1407 and ARGS as second argument. */
1410 internal_condition_case_n (Lisp_Object (*bfun
) (ptrdiff_t, Lisp_Object
*),
1413 Lisp_Object handlers
,
1414 Lisp_Object (*hfun
) (Lisp_Object err
,
1421 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1422 if (sys_setjmp (c
->jmp
))
1424 Lisp_Object val
= handlerlist
->val
;
1425 clobbered_eassert (handlerlist
== c
);
1426 handlerlist
= handlerlist
->next
;
1427 return (*hfun
) (val
, nargs
, args
);
1430 val
= (*bfun
) (nargs
, args
);
1431 clobbered_eassert (handlerlist
== c
);
1432 handlerlist
= handlerlist
->next
;
1437 static Lisp_Object
find_handler_clause (Lisp_Object
, Lisp_Object
);
1438 static bool maybe_call_debugger (Lisp_Object conditions
, Lisp_Object sig
,
1442 process_quit_flag (void)
1444 Lisp_Object flag
= Vquit_flag
;
1446 if (EQ (flag
, Qkill_emacs
))
1448 if (EQ (Vthrow_on_input
, flag
))
1449 Fthrow (Vthrow_on_input
, Qt
);
1450 Fsignal (Qquit
, Qnil
);
1453 DEFUN ("signal", Fsignal
, Ssignal
, 2, 2, 0,
1454 doc
: /* Signal an error. Args are ERROR-SYMBOL and associated DATA.
1455 This function does not return.
1457 An error symbol is a symbol with an `error-conditions' property
1458 that is a list of condition names.
1459 A handler for any of those names will get to handle this signal.
1460 The symbol `error' should normally be one of them.
1462 DATA should be a list. Its elements are printed as part of the error message.
1463 See Info anchor `(elisp)Definition of signal' for some details on how this
1464 error message is constructed.
1465 If the signal is handled, DATA is made available to the handler.
1466 See also the function `condition-case'. */)
1467 (Lisp_Object error_symbol
, Lisp_Object data
)
1469 /* When memory is full, ERROR-SYMBOL is nil,
1470 and DATA is (REAL-ERROR-SYMBOL . REAL-DATA).
1471 That is a special case--don't do this in other situations. */
1472 Lisp_Object conditions
;
1474 Lisp_Object real_error_symbol
1475 = (NILP (error_symbol
) ? Fcar (data
) : error_symbol
);
1476 register Lisp_Object clause
= Qnil
;
1480 if (waiting_for_input
)
1483 #if 0 /* rms: I don't know why this was here,
1484 but it is surely wrong for an error that is handled. */
1485 #ifdef HAVE_WINDOW_SYSTEM
1486 if (display_hourglass_p
)
1487 cancel_hourglass ();
1491 /* This hook is used by edebug. */
1492 if (! NILP (Vsignal_hook_function
)
1493 && ! NILP (error_symbol
))
1495 /* Edebug takes care of restoring these variables when it exits. */
1496 if (lisp_eval_depth
+ 20 > max_lisp_eval_depth
)
1497 max_lisp_eval_depth
= lisp_eval_depth
+ 20;
1499 if (SPECPDL_INDEX () + 40 > max_specpdl_size
)
1500 max_specpdl_size
= SPECPDL_INDEX () + 40;
1502 call2 (Vsignal_hook_function
, error_symbol
, data
);
1505 conditions
= Fget (real_error_symbol
, Qerror_conditions
);
1507 /* Remember from where signal was called. Skip over the frame for
1508 `signal' itself. If a frame for `error' follows, skip that,
1509 too. Don't do this when ERROR_SYMBOL is nil, because that
1510 is a memory-full error. */
1511 Vsignaling_function
= Qnil
;
1512 if (!NILP (error_symbol
))
1514 union specbinding
*pdl
= backtrace_next (backtrace_top ());
1515 if (backtrace_p (pdl
) && EQ (backtrace_function (pdl
), Qerror
))
1516 pdl
= backtrace_next (pdl
);
1517 if (backtrace_p (pdl
))
1518 Vsignaling_function
= backtrace_function (pdl
);
1521 for (h
= handlerlist
; h
; h
= h
->next
)
1523 if (h
->type
!= CONDITION_CASE
)
1525 clause
= find_handler_clause (h
->tag_or_ch
, conditions
);
1530 if (/* Don't run the debugger for a memory-full error.
1531 (There is no room in memory to do that!) */
1532 !NILP (error_symbol
)
1533 && (!NILP (Vdebug_on_signal
)
1534 /* If no handler is present now, try to run the debugger. */
1536 /* A `debug' symbol in the handler list disables the normal
1537 suppression of the debugger. */
1538 || (CONSP (clause
) && CONSP (clause
)
1539 && !NILP (Fmemq (Qdebug
, clause
)))
1540 /* Special handler that means "print a message and run debugger
1542 || EQ (h
->tag_or_ch
, Qerror
)))
1544 bool debugger_called
1545 = maybe_call_debugger (conditions
, error_symbol
, data
);
1546 /* We can't return values to code which signaled an error, but we
1547 can continue code which has signaled a quit. */
1548 if (debugger_called
&& EQ (real_error_symbol
, Qquit
))
1554 Lisp_Object unwind_data
1555 = (NILP (error_symbol
) ? data
: Fcons (error_symbol
, data
));
1557 unwind_to_catch (h
, unwind_data
);
1561 if (handlerlist
!= &handlerlist_sentinel
)
1562 /* FIXME: This will come right back here if there's no `top-level'
1563 catcher. A better solution would be to abort here, and instead
1564 add a catch-all condition handler so we never come here. */
1565 Fthrow (Qtop_level
, Qt
);
1568 if (! NILP (error_symbol
))
1569 data
= Fcons (error_symbol
, data
);
1571 string
= Ferror_message_string (data
);
1572 fatal ("%s", SDATA (string
));
1575 /* Internal version of Fsignal that never returns.
1576 Used for anything but Qquit (which can return from Fsignal). */
1579 xsignal (Lisp_Object error_symbol
, Lisp_Object data
)
1581 Fsignal (error_symbol
, data
);
1585 /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */
1588 xsignal0 (Lisp_Object error_symbol
)
1590 xsignal (error_symbol
, Qnil
);
1594 xsignal1 (Lisp_Object error_symbol
, Lisp_Object arg
)
1596 xsignal (error_symbol
, list1 (arg
));
1600 xsignal2 (Lisp_Object error_symbol
, Lisp_Object arg1
, Lisp_Object arg2
)
1602 xsignal (error_symbol
, list2 (arg1
, arg2
));
1606 xsignal3 (Lisp_Object error_symbol
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
)
1608 xsignal (error_symbol
, list3 (arg1
, arg2
, arg3
));
1611 /* Signal `error' with message S, and additional arg ARG.
1612 If ARG is not a genuine list, make it a one-element list. */
1615 signal_error (const char *s
, Lisp_Object arg
)
1617 Lisp_Object tortoise
, hare
;
1619 hare
= tortoise
= arg
;
1620 while (CONSP (hare
))
1627 tortoise
= XCDR (tortoise
);
1629 if (EQ (hare
, tortoise
))
1636 xsignal (Qerror
, Fcons (build_string (s
), arg
));
1640 /* Return true if LIST is a non-nil atom or
1641 a list containing one of CONDITIONS. */
1644 wants_debugger (Lisp_Object list
, Lisp_Object conditions
)
1651 while (CONSP (conditions
))
1653 Lisp_Object
this, tail
;
1654 this = XCAR (conditions
);
1655 for (tail
= list
; CONSP (tail
); tail
= XCDR (tail
))
1656 if (EQ (XCAR (tail
), this))
1658 conditions
= XCDR (conditions
);
1663 /* Return true if an error with condition-symbols CONDITIONS,
1664 and described by SIGNAL-DATA, should skip the debugger
1665 according to debugger-ignored-errors. */
1668 skip_debugger (Lisp_Object conditions
, Lisp_Object data
)
1671 bool first_string
= 1;
1672 Lisp_Object error_message
;
1674 error_message
= Qnil
;
1675 for (tail
= Vdebug_ignored_errors
; CONSP (tail
); tail
= XCDR (tail
))
1677 if (STRINGP (XCAR (tail
)))
1681 error_message
= Ferror_message_string (data
);
1685 if (fast_string_match (XCAR (tail
), error_message
) >= 0)
1690 Lisp_Object contail
;
1692 for (contail
= conditions
; CONSP (contail
); contail
= XCDR (contail
))
1693 if (EQ (XCAR (tail
), XCAR (contail
)))
1701 /* Call the debugger if calling it is currently enabled for CONDITIONS.
1702 SIG and DATA describe the signal. There are two ways to pass them:
1703 = SIG is the error symbol, and DATA is the rest of the data.
1704 = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
1705 This is for memory-full errors only. */
1707 maybe_call_debugger (Lisp_Object conditions
, Lisp_Object sig
, Lisp_Object data
)
1709 Lisp_Object combined_data
;
1711 combined_data
= Fcons (sig
, data
);
1714 /* Don't try to run the debugger with interrupts blocked.
1715 The editing loop would return anyway. */
1716 ! input_blocked_p ()
1717 && NILP (Vinhibit_debugger
)
1718 /* Does user want to enter debugger for this kind of error? */
1721 : wants_debugger (Vdebug_on_error
, conditions
))
1722 && ! skip_debugger (conditions
, combined_data
)
1723 /* RMS: What's this for? */
1724 && when_entered_debugger
< num_nonmacro_input_events
)
1726 call_debugger (list2 (Qerror
, combined_data
));
1734 find_handler_clause (Lisp_Object handlers
, Lisp_Object conditions
)
1736 register Lisp_Object h
;
1738 /* t is used by handlers for all conditions, set up by C code. */
1739 if (EQ (handlers
, Qt
))
1742 /* error is used similarly, but means print an error message
1743 and run the debugger if that is enabled. */
1744 if (EQ (handlers
, Qerror
))
1747 for (h
= handlers
; CONSP (h
); h
= XCDR (h
))
1749 Lisp_Object handler
= XCAR (h
);
1750 if (!NILP (Fmemq (handler
, conditions
)))
1758 /* Dump an error message; called like vprintf. */
1760 verror (const char *m
, va_list ap
)
1763 ptrdiff_t size
= sizeof buf
;
1764 ptrdiff_t size_max
= STRING_BYTES_BOUND
+ 1;
1769 used
= evxprintf (&buffer
, &size
, buf
, size_max
, m
, ap
);
1770 string
= make_string (buffer
, used
);
1774 xsignal1 (Qerror
, string
);
1778 /* Dump an error message; called like printf. */
1782 error (const char *m
, ...)
1789 DEFUN ("commandp", Fcommandp
, Scommandp
, 1, 2, 0,
1790 doc
: /* Non-nil if FUNCTION makes provisions for interactive calling.
1791 This means it contains a description for how to read arguments to give it.
1792 The value is nil for an invalid function or a symbol with no function
1795 Interactively callable functions include strings and vectors (treated
1796 as keyboard macros), lambda-expressions that contain a top-level call
1797 to `interactive', autoload definitions made by `autoload' with non-nil
1798 fourth argument, and some of the built-in functions of Lisp.
1800 Also, a symbol satisfies `commandp' if its function definition does so.
1802 If the optional argument FOR-CALL-INTERACTIVELY is non-nil,
1803 then strings and vectors are not accepted. */)
1804 (Lisp_Object function
, Lisp_Object for_call_interactively
)
1806 register Lisp_Object fun
;
1807 register Lisp_Object funcar
;
1808 Lisp_Object if_prop
= Qnil
;
1812 fun
= indirect_function (fun
); /* Check cycles. */
1816 /* Check an `interactive-form' property if present, analogous to the
1817 function-documentation property. */
1819 while (SYMBOLP (fun
))
1821 Lisp_Object tmp
= Fget (fun
, Qinteractive_form
);
1824 fun
= Fsymbol_function (fun
);
1827 /* Emacs primitives are interactive if their DEFUN specifies an
1828 interactive spec. */
1830 return XSUBR (fun
)->intspec
? Qt
: if_prop
;
1832 /* Bytecode objects are interactive if they are long enough to
1833 have an element whose index is COMPILED_INTERACTIVE, which is
1834 where the interactive spec is stored. */
1835 else if (COMPILEDP (fun
))
1836 return ((ASIZE (fun
) & PSEUDOVECTOR_SIZE_MASK
) > COMPILED_INTERACTIVE
1839 /* Strings and vectors are keyboard macros. */
1840 if (STRINGP (fun
) || VECTORP (fun
))
1841 return (NILP (for_call_interactively
) ? Qt
: Qnil
);
1843 /* Lists may represent commands. */
1846 funcar
= XCAR (fun
);
1847 if (EQ (funcar
, Qclosure
))
1848 return (!NILP (Fassq (Qinteractive
, Fcdr (Fcdr (XCDR (fun
)))))
1850 else if (EQ (funcar
, Qlambda
))
1851 return !NILP (Fassq (Qinteractive
, Fcdr (XCDR (fun
)))) ? Qt
: if_prop
;
1852 else if (EQ (funcar
, Qautoload
))
1853 return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun
))))) ? Qt
: if_prop
;
1858 DEFUN ("autoload", Fautoload
, Sautoload
, 2, 5, 0,
1859 doc
: /* Define FUNCTION to autoload from FILE.
1860 FUNCTION is a symbol; FILE is a file name string to pass to `load'.
1861 Third arg DOCSTRING is documentation for the function.
1862 Fourth arg INTERACTIVE if non-nil says function can be called interactively.
1863 Fifth arg TYPE indicates the type of the object:
1864 nil or omitted says FUNCTION is a function,
1865 `keymap' says FUNCTION is really a keymap, and
1866 `macro' or t says FUNCTION is really a macro.
1867 Third through fifth args give info about the real definition.
1868 They default to nil.
1869 If FUNCTION is already defined other than as an autoload,
1870 this does nothing and returns nil. */)
1871 (Lisp_Object function
, Lisp_Object file
, Lisp_Object docstring
, Lisp_Object interactive
, Lisp_Object type
)
1873 CHECK_SYMBOL (function
);
1874 CHECK_STRING (file
);
1876 /* If function is defined and not as an autoload, don't override. */
1877 if (!NILP (XSYMBOL (function
)->function
)
1878 && !AUTOLOADP (XSYMBOL (function
)->function
))
1881 return Fdefalias (function
,
1882 list5 (Qautoload
, file
, docstring
, interactive
, type
),
1887 un_autoload (Lisp_Object oldqueue
)
1889 Lisp_Object queue
, first
, second
;
1891 /* Queue to unwind is current value of Vautoload_queue.
1892 oldqueue is the shadowed value to leave in Vautoload_queue. */
1893 queue
= Vautoload_queue
;
1894 Vautoload_queue
= oldqueue
;
1895 while (CONSP (queue
))
1897 first
= XCAR (queue
);
1898 second
= Fcdr (first
);
1899 first
= Fcar (first
);
1900 if (EQ (first
, make_number (0)))
1903 Ffset (first
, second
);
1904 queue
= XCDR (queue
);
1908 /* Load an autoloaded function.
1909 FUNNAME is the symbol which is the function's name.
1910 FUNDEF is the autoload definition (a list). */
1912 DEFUN ("autoload-do-load", Fautoload_do_load
, Sautoload_do_load
, 1, 3, 0,
1913 doc
: /* Load FUNDEF which should be an autoload.
1914 If non-nil, FUNNAME should be the symbol whose function value is FUNDEF,
1915 in which case the function returns the new autoloaded function value.
1916 If equal to `macro', MACRO-ONLY specifies that FUNDEF should only be loaded if
1917 it is defines a macro. */)
1918 (Lisp_Object fundef
, Lisp_Object funname
, Lisp_Object macro_only
)
1920 ptrdiff_t count
= SPECPDL_INDEX ();
1921 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1923 if (!CONSP (fundef
) || !EQ (Qautoload
, XCAR (fundef
)))
1926 if (EQ (macro_only
, Qmacro
))
1928 Lisp_Object kind
= Fnth (make_number (4), fundef
);
1929 if (! (EQ (kind
, Qt
) || EQ (kind
, Qmacro
)))
1933 /* This is to make sure that loadup.el gives a clear picture
1934 of what files are preloaded and when. */
1935 if (! NILP (Vpurify_flag
))
1936 error ("Attempt to autoload %s while preparing to dump",
1937 SDATA (SYMBOL_NAME (funname
)));
1939 CHECK_SYMBOL (funname
);
1940 GCPRO3 (funname
, fundef
, macro_only
);
1942 /* Preserve the match data. */
1943 record_unwind_save_match_data ();
1945 /* If autoloading gets an error (which includes the error of failing
1946 to define the function being called), we use Vautoload_queue
1947 to undo function definitions and `provide' calls made by
1948 the function. We do this in the specific case of autoloading
1949 because autoloading is not an explicit request "load this file",
1950 but rather a request to "call this function".
1952 The value saved here is to be restored into Vautoload_queue. */
1953 record_unwind_protect (un_autoload
, Vautoload_queue
);
1954 Vautoload_queue
= Qt
;
1955 /* If `macro_only', assume this autoload to be a "best-effort",
1956 so don't signal an error if autoloading fails. */
1957 Fload (Fcar (Fcdr (fundef
)), macro_only
, Qt
, Qnil
, Qt
);
1959 /* Once loading finishes, don't undo it. */
1960 Vautoload_queue
= Qt
;
1961 unbind_to (count
, Qnil
);
1969 Lisp_Object fun
= Findirect_function (funname
, Qnil
);
1971 if (!NILP (Fequal (fun
, fundef
)))
1972 error ("Autoloading failed to define function %s",
1973 SDATA (SYMBOL_NAME (funname
)));
1980 DEFUN ("eval", Feval
, Seval
, 1, 2, 0,
1981 doc
: /* Evaluate FORM and return its value.
1982 If LEXICAL is t, evaluate using lexical scoping.
1983 LEXICAL can also be an actual lexical environment, in the form of an
1984 alist mapping symbols to their value. */)
1985 (Lisp_Object form
, Lisp_Object lexical
)
1987 ptrdiff_t count
= SPECPDL_INDEX ();
1988 specbind (Qinternal_interpreter_environment
,
1989 CONSP (lexical
) || NILP (lexical
) ? lexical
: list1 (Qt
));
1990 return unbind_to (count
, eval_sub (form
));
1993 /* Grow the specpdl stack by one entry.
1994 The caller should have already initialized the entry.
1995 Signal an error on stack overflow.
1997 Make sure that there is always one unused entry past the top of the
1998 stack, so that the just-initialized entry is safely unwound if
1999 memory exhausted and an error is signaled here. Also, allocate a
2000 never-used entry just before the bottom of the stack; sometimes its
2001 address is taken. */
2008 if (specpdl_ptr
== specpdl
+ specpdl_size
)
2010 ptrdiff_t count
= SPECPDL_INDEX ();
2011 ptrdiff_t max_size
= min (max_specpdl_size
, PTRDIFF_MAX
- 1000);
2012 union specbinding
*pdlvec
= specpdl
- 1;
2013 ptrdiff_t pdlvecsize
= specpdl_size
+ 1;
2014 if (max_size
<= specpdl_size
)
2016 if (max_specpdl_size
< 400)
2017 max_size
= max_specpdl_size
= 400;
2018 if (max_size
<= specpdl_size
)
2019 signal_error ("Variable binding depth exceeds max-specpdl-size",
2022 pdlvec
= xpalloc (pdlvec
, &pdlvecsize
, 1, max_size
+ 1, sizeof *specpdl
);
2023 specpdl
= pdlvec
+ 1;
2024 specpdl_size
= pdlvecsize
- 1;
2025 specpdl_ptr
= specpdl
+ count
;
2030 record_in_backtrace (Lisp_Object function
, Lisp_Object
*args
, ptrdiff_t nargs
)
2032 eassert (nargs
>= UNEVALLED
);
2033 specpdl_ptr
->bt
.kind
= SPECPDL_BACKTRACE
;
2034 specpdl_ptr
->bt
.debug_on_exit
= false;
2035 specpdl_ptr
->bt
.function
= function
;
2036 specpdl_ptr
->bt
.args
= args
;
2037 specpdl_ptr
->bt
.nargs
= nargs
;
2041 /* Eval a sub-expression of the current expression (i.e. in the same
2044 eval_sub (Lisp_Object form
)
2046 Lisp_Object fun
, val
, original_fun
, original_args
;
2048 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2052 /* Look up its binding in the lexical environment.
2053 We do not pay attention to the declared_special flag here, since we
2054 already did that when let-binding the variable. */
2055 Lisp_Object lex_binding
2056 = !NILP (Vinternal_interpreter_environment
) /* Mere optimization! */
2057 ? Fassq (form
, Vinternal_interpreter_environment
)
2059 if (CONSP (lex_binding
))
2060 return XCDR (lex_binding
);
2062 return Fsymbol_value (form
);
2074 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2076 if (max_lisp_eval_depth
< 100)
2077 max_lisp_eval_depth
= 100;
2078 if (lisp_eval_depth
> max_lisp_eval_depth
)
2079 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2082 original_fun
= XCAR (form
);
2083 original_args
= XCDR (form
);
2085 /* This also protects them from gc. */
2086 record_in_backtrace (original_fun
, &original_args
, UNEVALLED
);
2088 if (debug_on_next_call
)
2089 do_debug_on_call (Qt
);
2091 /* At this point, only original_fun and original_args
2092 have values that will be used below. */
2095 /* Optimize for no indirection. */
2098 fun
= Ffunction (Fcons (fun
, Qnil
));
2099 else if (!NILP (fun
) && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2100 fun
= indirect_function (fun
);
2104 Lisp_Object numargs
;
2105 Lisp_Object argvals
[8];
2106 Lisp_Object args_left
;
2107 register int i
, maxargs
;
2109 args_left
= original_args
;
2110 numargs
= Flength (args_left
);
2112 if (XINT (numargs
) < XSUBR (fun
)->min_args
2113 || (XSUBR (fun
)->max_args
>= 0
2114 && XSUBR (fun
)->max_args
< XINT (numargs
)))
2115 xsignal2 (Qwrong_number_of_arguments
, original_fun
, numargs
);
2117 else if (XSUBR (fun
)->max_args
== UNEVALLED
)
2118 val
= (XSUBR (fun
)->function
.aUNEVALLED
) (args_left
);
2119 else if (XSUBR (fun
)->max_args
== MANY
)
2121 /* Pass a vector of evaluated arguments. */
2123 ptrdiff_t argnum
= 0;
2126 SAFE_ALLOCA_LISP (vals
, XINT (numargs
));
2128 GCPRO3 (args_left
, fun
, fun
);
2132 while (!NILP (args_left
))
2134 vals
[argnum
++] = eval_sub (Fcar (args_left
));
2135 args_left
= Fcdr (args_left
);
2136 gcpro3
.nvars
= argnum
;
2139 set_backtrace_args (specpdl_ptr
- 1, vals
);
2140 set_backtrace_nargs (specpdl_ptr
- 1, XINT (numargs
));
2142 val
= (XSUBR (fun
)->function
.aMANY
) (XINT (numargs
), vals
);
2148 GCPRO3 (args_left
, fun
, fun
);
2149 gcpro3
.var
= argvals
;
2152 maxargs
= XSUBR (fun
)->max_args
;
2153 for (i
= 0; i
< maxargs
; args_left
= Fcdr (args_left
))
2155 argvals
[i
] = eval_sub (Fcar (args_left
));
2161 set_backtrace_args (specpdl_ptr
- 1, argvals
);
2162 set_backtrace_nargs (specpdl_ptr
- 1, XINT (numargs
));
2167 val
= (XSUBR (fun
)->function
.a0 ());
2170 val
= (XSUBR (fun
)->function
.a1 (argvals
[0]));
2173 val
= (XSUBR (fun
)->function
.a2 (argvals
[0], argvals
[1]));
2176 val
= (XSUBR (fun
)->function
.a3
2177 (argvals
[0], argvals
[1], argvals
[2]));
2180 val
= (XSUBR (fun
)->function
.a4
2181 (argvals
[0], argvals
[1], argvals
[2], argvals
[3]));
2184 val
= (XSUBR (fun
)->function
.a5
2185 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2189 val
= (XSUBR (fun
)->function
.a6
2190 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2191 argvals
[4], argvals
[5]));
2194 val
= (XSUBR (fun
)->function
.a7
2195 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2196 argvals
[4], argvals
[5], argvals
[6]));
2200 val
= (XSUBR (fun
)->function
.a8
2201 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2202 argvals
[4], argvals
[5], argvals
[6], argvals
[7]));
2206 /* Someone has created a subr that takes more arguments than
2207 is supported by this code. We need to either rewrite the
2208 subr to use a different argument protocol, or add more
2209 cases to this switch. */
2214 else if (COMPILEDP (fun
))
2215 val
= apply_lambda (fun
, original_args
);
2219 xsignal1 (Qvoid_function
, original_fun
);
2221 xsignal1 (Qinvalid_function
, original_fun
);
2222 funcar
= XCAR (fun
);
2223 if (!SYMBOLP (funcar
))
2224 xsignal1 (Qinvalid_function
, original_fun
);
2225 if (EQ (funcar
, Qautoload
))
2227 Fautoload_do_load (fun
, original_fun
, Qnil
);
2230 if (EQ (funcar
, Qmacro
))
2232 ptrdiff_t count
= SPECPDL_INDEX ();
2234 /* Bind lexical-binding during expansion of the macro, so the
2235 macro can know reliably if the code it outputs will be
2236 interpreted using lexical-binding or not. */
2237 specbind (Qlexical_binding
,
2238 NILP (Vinternal_interpreter_environment
) ? Qnil
: Qt
);
2239 exp
= apply1 (Fcdr (fun
), original_args
);
2240 unbind_to (count
, Qnil
);
2241 val
= eval_sub (exp
);
2243 else if (EQ (funcar
, Qlambda
)
2244 || EQ (funcar
, Qclosure
))
2245 val
= apply_lambda (fun
, original_args
);
2247 xsignal1 (Qinvalid_function
, original_fun
);
2251 if (backtrace_debug_on_exit (specpdl_ptr
- 1))
2252 val
= call_debugger (list2 (Qexit
, val
));
2258 DEFUN ("apply", Fapply
, Sapply
, 1, MANY
, 0,
2259 doc
: /* Call FUNCTION with our remaining args, using our last arg as list of args.
2260 Then return the value FUNCTION returns.
2261 Thus, (apply '+ 1 2 '(3 4)) returns 10.
2262 usage: (apply FUNCTION &rest ARGUMENTS) */)
2263 (ptrdiff_t nargs
, Lisp_Object
*args
)
2267 register Lisp_Object spread_arg
;
2268 register Lisp_Object
*funcall_args
;
2269 Lisp_Object fun
, retval
;
2270 struct gcpro gcpro1
;
2275 spread_arg
= args
[nargs
- 1];
2276 CHECK_LIST (spread_arg
);
2278 numargs
= XINT (Flength (spread_arg
));
2281 return Ffuncall (nargs
- 1, args
);
2282 else if (numargs
== 1)
2284 args
[nargs
- 1] = XCAR (spread_arg
);
2285 return Ffuncall (nargs
, args
);
2288 numargs
+= nargs
- 2;
2290 /* Optimize for no indirection. */
2291 if (SYMBOLP (fun
) && !NILP (fun
)
2292 && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2293 fun
= indirect_function (fun
);
2296 /* Let funcall get the error. */
2303 if (numargs
< XSUBR (fun
)->min_args
2304 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2305 goto funcall
; /* Let funcall get the error. */
2306 else if (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
> numargs
)
2308 /* Avoid making funcall cons up a yet another new vector of arguments
2309 by explicitly supplying nil's for optional values. */
2310 SAFE_ALLOCA_LISP (funcall_args
, 1 + XSUBR (fun
)->max_args
);
2311 for (i
= numargs
; i
< XSUBR (fun
)->max_args
;)
2312 funcall_args
[++i
] = Qnil
;
2313 GCPRO1 (*funcall_args
);
2314 gcpro1
.nvars
= 1 + XSUBR (fun
)->max_args
;
2318 /* We add 1 to numargs because funcall_args includes the
2319 function itself as well as its arguments. */
2322 SAFE_ALLOCA_LISP (funcall_args
, 1 + numargs
);
2323 GCPRO1 (*funcall_args
);
2324 gcpro1
.nvars
= 1 + numargs
;
2327 memcpy (funcall_args
, args
, nargs
* word_size
);
2328 /* Spread the last arg we got. Its first element goes in
2329 the slot that it used to occupy, hence this value of I. */
2331 while (!NILP (spread_arg
))
2333 funcall_args
[i
++] = XCAR (spread_arg
);
2334 spread_arg
= XCDR (spread_arg
);
2337 /* By convention, the caller needs to gcpro Ffuncall's args. */
2338 retval
= Ffuncall (gcpro1
.nvars
, funcall_args
);
2345 /* Run hook variables in various ways. */
2348 funcall_nil (ptrdiff_t nargs
, Lisp_Object
*args
)
2350 Ffuncall (nargs
, args
);
2354 DEFUN ("run-hooks", Frun_hooks
, Srun_hooks
, 0, MANY
, 0,
2355 doc
: /* Run each hook in HOOKS.
2356 Each argument should be a symbol, a hook variable.
2357 These symbols are processed in the order specified.
2358 If a hook symbol has a non-nil value, that value may be a function
2359 or a list of functions to be called to run the hook.
2360 If the value is a function, it is called with no arguments.
2361 If it is a list, the elements are called, in order, with no arguments.
2363 Major modes should not use this function directly to run their mode
2364 hook; they should use `run-mode-hooks' instead.
2366 Do not use `make-local-variable' to make a hook variable buffer-local.
2367 Instead, use `add-hook' and specify t for the LOCAL argument.
2368 usage: (run-hooks &rest HOOKS) */)
2369 (ptrdiff_t nargs
, Lisp_Object
*args
)
2371 Lisp_Object hook
[1];
2374 for (i
= 0; i
< nargs
; i
++)
2377 run_hook_with_args (1, hook
, funcall_nil
);
2383 DEFUN ("run-hook-with-args", Frun_hook_with_args
,
2384 Srun_hook_with_args
, 1, MANY
, 0,
2385 doc
: /* Run HOOK with the specified arguments ARGS.
2386 HOOK should be a symbol, a hook variable. The value of HOOK
2387 may be nil, a function, or a list of functions. Call each
2388 function in order with arguments ARGS. The final return value
2391 Do not use `make-local-variable' to make a hook variable buffer-local.
2392 Instead, use `add-hook' and specify t for the LOCAL argument.
2393 usage: (run-hook-with-args HOOK &rest ARGS) */)
2394 (ptrdiff_t nargs
, Lisp_Object
*args
)
2396 return run_hook_with_args (nargs
, args
, funcall_nil
);
2399 /* NB this one still documents a specific non-nil return value.
2400 (As did run-hook-with-args and run-hook-with-args-until-failure
2401 until they were changed in 24.1.) */
2402 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success
,
2403 Srun_hook_with_args_until_success
, 1, MANY
, 0,
2404 doc
: /* Run HOOK with the specified arguments ARGS.
2405 HOOK should be a symbol, a hook variable. The value of HOOK
2406 may be nil, a function, or a list of functions. Call each
2407 function in order with arguments ARGS, stopping at the first
2408 one that returns non-nil, and return that value. Otherwise (if
2409 all functions return nil, or if there are no functions to call),
2412 Do not use `make-local-variable' to make a hook variable buffer-local.
2413 Instead, use `add-hook' and specify t for the LOCAL argument.
2414 usage: (run-hook-with-args-until-success HOOK &rest ARGS) */)
2415 (ptrdiff_t nargs
, Lisp_Object
*args
)
2417 return run_hook_with_args (nargs
, args
, Ffuncall
);
2421 funcall_not (ptrdiff_t nargs
, Lisp_Object
*args
)
2423 return NILP (Ffuncall (nargs
, args
)) ? Qt
: Qnil
;
2426 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure
,
2427 Srun_hook_with_args_until_failure
, 1, MANY
, 0,
2428 doc
: /* Run HOOK with the specified arguments ARGS.
2429 HOOK should be a symbol, a hook variable. The value of HOOK
2430 may be nil, a function, or a list of functions. Call each
2431 function in order with arguments ARGS, stopping at the first
2432 one that returns nil, and return nil. Otherwise (if all functions
2433 return non-nil, or if there are no functions to call), return non-nil
2434 \(do not rely on the precise return value in this case).
2436 Do not use `make-local-variable' to make a hook variable buffer-local.
2437 Instead, use `add-hook' and specify t for the LOCAL argument.
2438 usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */)
2439 (ptrdiff_t nargs
, Lisp_Object
*args
)
2441 return NILP (run_hook_with_args (nargs
, args
, funcall_not
)) ? Qt
: Qnil
;
2445 run_hook_wrapped_funcall (ptrdiff_t nargs
, Lisp_Object
*args
)
2447 Lisp_Object tmp
= args
[0], ret
;
2450 ret
= Ffuncall (nargs
, args
);
2456 DEFUN ("run-hook-wrapped", Frun_hook_wrapped
, Srun_hook_wrapped
, 2, MANY
, 0,
2457 doc
: /* Run HOOK, passing each function through WRAP-FUNCTION.
2458 I.e. instead of calling each function FUN directly with arguments ARGS,
2459 it calls WRAP-FUNCTION with arguments FUN and ARGS.
2460 As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped'
2461 aborts and returns that value.
2462 usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */)
2463 (ptrdiff_t nargs
, Lisp_Object
*args
)
2465 return run_hook_with_args (nargs
, args
, run_hook_wrapped_funcall
);
2468 /* ARGS[0] should be a hook symbol.
2469 Call each of the functions in the hook value, passing each of them
2470 as arguments all the rest of ARGS (all NARGS - 1 elements).
2471 FUNCALL specifies how to call each function on the hook.
2472 The caller (or its caller, etc) must gcpro all of ARGS,
2473 except that it isn't necessary to gcpro ARGS[0]. */
2476 run_hook_with_args (ptrdiff_t nargs
, Lisp_Object
*args
,
2477 Lisp_Object (*funcall
) (ptrdiff_t nargs
, Lisp_Object
*args
))
2479 Lisp_Object sym
, val
, ret
= Qnil
;
2480 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2482 /* If we are dying or still initializing,
2483 don't do anything--it would probably crash if we tried. */
2484 if (NILP (Vrun_hooks
))
2488 val
= find_symbol_value (sym
);
2490 if (EQ (val
, Qunbound
) || NILP (val
))
2492 else if (!CONSP (val
) || FUNCTIONP (val
))
2495 return funcall (nargs
, args
);
2499 Lisp_Object global_vals
= Qnil
;
2500 GCPRO3 (sym
, val
, global_vals
);
2503 CONSP (val
) && NILP (ret
);
2506 if (EQ (XCAR (val
), Qt
))
2508 /* t indicates this hook has a local binding;
2509 it means to run the global binding too. */
2510 global_vals
= Fdefault_value (sym
);
2511 if (NILP (global_vals
)) continue;
2513 if (!CONSP (global_vals
) || EQ (XCAR (global_vals
), Qlambda
))
2515 args
[0] = global_vals
;
2516 ret
= funcall (nargs
, args
);
2521 CONSP (global_vals
) && NILP (ret
);
2522 global_vals
= XCDR (global_vals
))
2524 args
[0] = XCAR (global_vals
);
2525 /* In a global value, t should not occur. If it does, we
2526 must ignore it to avoid an endless loop. */
2527 if (!EQ (args
[0], Qt
))
2528 ret
= funcall (nargs
, args
);
2534 args
[0] = XCAR (val
);
2535 ret
= funcall (nargs
, args
);
2544 /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
2547 run_hook_with_args_2 (Lisp_Object hook
, Lisp_Object arg1
, Lisp_Object arg2
)
2549 Lisp_Object temp
[3];
2554 Frun_hook_with_args (3, temp
);
2557 /* Apply fn to arg. */
2559 apply1 (Lisp_Object fn
, Lisp_Object arg
)
2561 struct gcpro gcpro1
;
2565 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2568 Lisp_Object args
[2];
2572 RETURN_UNGCPRO (Fapply (2, args
));
2576 /* Call function fn on no arguments. */
2578 call0 (Lisp_Object fn
)
2580 struct gcpro gcpro1
;
2583 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2586 /* Call function fn with 1 argument arg1. */
2589 call1 (Lisp_Object fn
, Lisp_Object arg1
)
2591 struct gcpro gcpro1
;
2592 Lisp_Object args
[2];
2598 RETURN_UNGCPRO (Ffuncall (2, args
));
2601 /* Call function fn with 2 arguments arg1, arg2. */
2604 call2 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
)
2606 struct gcpro gcpro1
;
2607 Lisp_Object args
[3];
2613 RETURN_UNGCPRO (Ffuncall (3, args
));
2616 /* Call function fn with 3 arguments arg1, arg2, arg3. */
2619 call3 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
)
2621 struct gcpro gcpro1
;
2622 Lisp_Object args
[4];
2629 RETURN_UNGCPRO (Ffuncall (4, args
));
2632 /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */
2635 call4 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2638 struct gcpro gcpro1
;
2639 Lisp_Object args
[5];
2647 RETURN_UNGCPRO (Ffuncall (5, args
));
2650 /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */
2653 call5 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2654 Lisp_Object arg4
, Lisp_Object arg5
)
2656 struct gcpro gcpro1
;
2657 Lisp_Object args
[6];
2666 RETURN_UNGCPRO (Ffuncall (6, args
));
2669 /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */
2672 call6 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2673 Lisp_Object arg4
, Lisp_Object arg5
, Lisp_Object arg6
)
2675 struct gcpro gcpro1
;
2676 Lisp_Object args
[7];
2686 RETURN_UNGCPRO (Ffuncall (7, args
));
2689 /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */
2692 call7 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2693 Lisp_Object arg4
, Lisp_Object arg5
, Lisp_Object arg6
, Lisp_Object arg7
)
2695 struct gcpro gcpro1
;
2696 Lisp_Object args
[8];
2707 RETURN_UNGCPRO (Ffuncall (8, args
));
2710 /* The caller should GCPRO all the elements of ARGS. */
2712 DEFUN ("functionp", Ffunctionp
, Sfunctionp
, 1, 1, 0,
2713 doc
: /* Non-nil if OBJECT is a function. */)
2714 (Lisp_Object object
)
2716 if (FUNCTIONP (object
))
2721 DEFUN ("funcall", Ffuncall
, Sfuncall
, 1, MANY
, 0,
2722 doc
: /* Call first argument as a function, passing remaining arguments to it.
2723 Return the value that function returns.
2724 Thus, (funcall 'cons 'x 'y) returns (x . y).
2725 usage: (funcall FUNCTION &rest ARGUMENTS) */)
2726 (ptrdiff_t nargs
, Lisp_Object
*args
)
2728 Lisp_Object fun
, original_fun
;
2730 ptrdiff_t numargs
= nargs
- 1;
2731 Lisp_Object lisp_numargs
;
2733 register Lisp_Object
*internal_args
;
2738 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2740 if (max_lisp_eval_depth
< 100)
2741 max_lisp_eval_depth
= 100;
2742 if (lisp_eval_depth
> max_lisp_eval_depth
)
2743 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2746 /* This also GCPROs them. */
2747 record_in_backtrace (args
[0], &args
[1], nargs
- 1);
2749 /* Call GC after setting up the backtrace, so the latter GCPROs the args. */
2752 if (debug_on_next_call
)
2753 do_debug_on_call (Qlambda
);
2755 original_fun
= args
[0];
2759 /* Optimize for no indirection. */
2761 if (SYMBOLP (fun
) && !NILP (fun
)
2762 && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2763 fun
= indirect_function (fun
);
2767 if (numargs
< XSUBR (fun
)->min_args
2768 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2770 XSETFASTINT (lisp_numargs
, numargs
);
2771 xsignal2 (Qwrong_number_of_arguments
, original_fun
, lisp_numargs
);
2774 else if (XSUBR (fun
)->max_args
== UNEVALLED
)
2775 xsignal1 (Qinvalid_function
, original_fun
);
2777 else if (XSUBR (fun
)->max_args
== MANY
)
2778 val
= (XSUBR (fun
)->function
.aMANY
) (numargs
, args
+ 1);
2781 if (XSUBR (fun
)->max_args
> numargs
)
2783 internal_args
= alloca (XSUBR (fun
)->max_args
2784 * sizeof *internal_args
);
2785 memcpy (internal_args
, args
+ 1, numargs
* word_size
);
2786 for (i
= numargs
; i
< XSUBR (fun
)->max_args
; i
++)
2787 internal_args
[i
] = Qnil
;
2790 internal_args
= args
+ 1;
2791 switch (XSUBR (fun
)->max_args
)
2794 val
= (XSUBR (fun
)->function
.a0 ());
2797 val
= (XSUBR (fun
)->function
.a1 (internal_args
[0]));
2800 val
= (XSUBR (fun
)->function
.a2
2801 (internal_args
[0], internal_args
[1]));
2804 val
= (XSUBR (fun
)->function
.a3
2805 (internal_args
[0], internal_args
[1], internal_args
[2]));
2808 val
= (XSUBR (fun
)->function
.a4
2809 (internal_args
[0], internal_args
[1], internal_args
[2],
2813 val
= (XSUBR (fun
)->function
.a5
2814 (internal_args
[0], internal_args
[1], internal_args
[2],
2815 internal_args
[3], internal_args
[4]));
2818 val
= (XSUBR (fun
)->function
.a6
2819 (internal_args
[0], internal_args
[1], internal_args
[2],
2820 internal_args
[3], internal_args
[4], internal_args
[5]));
2823 val
= (XSUBR (fun
)->function
.a7
2824 (internal_args
[0], internal_args
[1], internal_args
[2],
2825 internal_args
[3], internal_args
[4], internal_args
[5],
2830 val
= (XSUBR (fun
)->function
.a8
2831 (internal_args
[0], internal_args
[1], internal_args
[2],
2832 internal_args
[3], internal_args
[4], internal_args
[5],
2833 internal_args
[6], internal_args
[7]));
2838 /* If a subr takes more than 8 arguments without using MANY
2839 or UNEVALLED, we need to extend this function to support it.
2840 Until this is done, there is no way to call the function. */
2845 else if (COMPILEDP (fun
))
2846 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2850 xsignal1 (Qvoid_function
, original_fun
);
2852 xsignal1 (Qinvalid_function
, original_fun
);
2853 funcar
= XCAR (fun
);
2854 if (!SYMBOLP (funcar
))
2855 xsignal1 (Qinvalid_function
, original_fun
);
2856 if (EQ (funcar
, Qlambda
)
2857 || EQ (funcar
, Qclosure
))
2858 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2859 else if (EQ (funcar
, Qautoload
))
2861 Fautoload_do_load (fun
, original_fun
, Qnil
);
2865 xsignal1 (Qinvalid_function
, original_fun
);
2868 if (backtrace_debug_on_exit (specpdl_ptr
- 1))
2869 val
= call_debugger (list2 (Qexit
, val
));
2875 apply_lambda (Lisp_Object fun
, Lisp_Object args
)
2877 Lisp_Object args_left
;
2880 register Lisp_Object
*arg_vector
;
2881 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2882 register Lisp_Object tem
;
2885 numargs
= XFASTINT (Flength (args
));
2886 SAFE_ALLOCA_LISP (arg_vector
, numargs
);
2889 GCPRO3 (*arg_vector
, args_left
, fun
);
2892 for (i
= 0; i
< numargs
; )
2894 tem
= Fcar (args_left
), args_left
= Fcdr (args_left
);
2895 tem
= eval_sub (tem
);
2896 arg_vector
[i
++] = tem
;
2902 set_backtrace_args (specpdl_ptr
- 1, arg_vector
);
2903 set_backtrace_nargs (specpdl_ptr
- 1, i
);
2904 tem
= funcall_lambda (fun
, numargs
, arg_vector
);
2906 /* Do the debug-on-exit now, while arg_vector still exists. */
2907 if (backtrace_debug_on_exit (specpdl_ptr
- 1))
2909 /* Don't do it again when we return to eval. */
2910 set_backtrace_debug_on_exit (specpdl_ptr
- 1, false);
2911 tem
= call_debugger (list2 (Qexit
, tem
));
2917 /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
2918 and return the result of evaluation.
2919 FUN must be either a lambda-expression or a compiled-code object. */
2922 funcall_lambda (Lisp_Object fun
, ptrdiff_t nargs
,
2923 register Lisp_Object
*arg_vector
)
2925 Lisp_Object val
, syms_left
, next
, lexenv
;
2926 ptrdiff_t count
= SPECPDL_INDEX ();
2928 bool optional
, rest
;
2932 if (EQ (XCAR (fun
), Qclosure
))
2934 fun
= XCDR (fun
); /* Drop `closure'. */
2935 lexenv
= XCAR (fun
);
2936 CHECK_LIST_CONS (fun
, fun
);
2940 syms_left
= XCDR (fun
);
2941 if (CONSP (syms_left
))
2942 syms_left
= XCAR (syms_left
);
2944 xsignal1 (Qinvalid_function
, fun
);
2946 else if (COMPILEDP (fun
))
2948 syms_left
= AREF (fun
, COMPILED_ARGLIST
);
2949 if (INTEGERP (syms_left
))
2950 /* A byte-code object with a non-nil `push args' slot means we
2951 shouldn't bind any arguments, instead just call the byte-code
2952 interpreter directly; it will push arguments as necessary.
2954 Byte-code objects with either a non-existent, or a nil value for
2955 the `push args' slot (the default), have dynamically-bound
2956 arguments, and use the argument-binding code below instead (as do
2957 all interpreted functions, even lexically bound ones). */
2959 /* If we have not actually read the bytecode string
2960 and constants vector yet, fetch them from the file. */
2961 if (CONSP (AREF (fun
, COMPILED_BYTECODE
)))
2962 Ffetch_bytecode (fun
);
2963 return exec_byte_code (AREF (fun
, COMPILED_BYTECODE
),
2964 AREF (fun
, COMPILED_CONSTANTS
),
2965 AREF (fun
, COMPILED_STACK_DEPTH
),
2974 i
= optional
= rest
= 0;
2975 for (; CONSP (syms_left
); syms_left
= XCDR (syms_left
))
2979 next
= XCAR (syms_left
);
2980 if (!SYMBOLP (next
))
2981 xsignal1 (Qinvalid_function
, fun
);
2983 if (EQ (next
, Qand_rest
))
2985 else if (EQ (next
, Qand_optional
))
2992 arg
= Flist (nargs
- i
, &arg_vector
[i
]);
2996 arg
= arg_vector
[i
++];
2998 xsignal2 (Qwrong_number_of_arguments
, fun
, make_number (nargs
));
3002 /* Bind the argument. */
3003 if (!NILP (lexenv
) && SYMBOLP (next
))
3004 /* Lexically bind NEXT by adding it to the lexenv alist. */
3005 lexenv
= Fcons (Fcons (next
, arg
), lexenv
);
3007 /* Dynamically bind NEXT. */
3008 specbind (next
, arg
);
3012 if (!NILP (syms_left
))
3013 xsignal1 (Qinvalid_function
, fun
);
3015 xsignal2 (Qwrong_number_of_arguments
, fun
, make_number (nargs
));
3017 if (!EQ (lexenv
, Vinternal_interpreter_environment
))
3018 /* Instantiate a new lexical environment. */
3019 specbind (Qinternal_interpreter_environment
, lexenv
);
3022 val
= Fprogn (XCDR (XCDR (fun
)));
3025 /* If we have not actually read the bytecode string
3026 and constants vector yet, fetch them from the file. */
3027 if (CONSP (AREF (fun
, COMPILED_BYTECODE
)))
3028 Ffetch_bytecode (fun
);
3029 val
= exec_byte_code (AREF (fun
, COMPILED_BYTECODE
),
3030 AREF (fun
, COMPILED_CONSTANTS
),
3031 AREF (fun
, COMPILED_STACK_DEPTH
),
3035 return unbind_to (count
, val
);
3038 DEFUN ("fetch-bytecode", Ffetch_bytecode
, Sfetch_bytecode
,
3040 doc
: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */)
3041 (Lisp_Object object
)
3045 if (COMPILEDP (object
) && CONSP (AREF (object
, COMPILED_BYTECODE
)))
3047 tem
= read_doc_string (AREF (object
, COMPILED_BYTECODE
));
3050 tem
= AREF (object
, COMPILED_BYTECODE
);
3051 if (CONSP (tem
) && STRINGP (XCAR (tem
)))
3052 error ("Invalid byte code in %s", SDATA (XCAR (tem
)));
3054 error ("Invalid byte code");
3056 ASET (object
, COMPILED_BYTECODE
, XCAR (tem
));
3057 ASET (object
, COMPILED_CONSTANTS
, XCDR (tem
));
3062 /* Return true if SYMBOL currently has a let-binding
3063 which was made in the buffer that is now current. */
3066 let_shadows_buffer_binding_p (struct Lisp_Symbol
*symbol
)
3068 union specbinding
*p
;
3069 Lisp_Object buf
= Fcurrent_buffer ();
3071 for (p
= specpdl_ptr
; p
> specpdl
; )
3072 if ((--p
)->kind
> SPECPDL_LET
)
3074 struct Lisp_Symbol
*let_bound_symbol
= XSYMBOL (specpdl_symbol (p
));
3075 eassert (let_bound_symbol
->redirect
!= SYMBOL_VARALIAS
);
3076 if (symbol
== let_bound_symbol
3077 && EQ (specpdl_where (p
), buf
))
3085 let_shadows_global_binding_p (Lisp_Object symbol
)
3087 union specbinding
*p
;
3089 for (p
= specpdl_ptr
; p
> specpdl
; )
3090 if ((--p
)->kind
>= SPECPDL_LET
&& EQ (specpdl_symbol (p
), symbol
))
3096 /* `specpdl_ptr' describes which variable is
3097 let-bound, so it can be properly undone when we unbind_to.
3098 It can be either a plain SPECPDL_LET or a SPECPDL_LET_LOCAL/DEFAULT.
3099 - SYMBOL is the variable being bound. Note that it should not be
3100 aliased (i.e. when let-binding V1 that's aliased to V2, we want
3102 - WHERE tells us in which buffer the binding took place.
3103 This is used for SPECPDL_LET_LOCAL bindings (i.e. bindings to a
3104 buffer-local variable) as well as for SPECPDL_LET_DEFAULT bindings,
3105 i.e. bindings to the default value of a variable which can be
3109 specbind (Lisp_Object symbol
, Lisp_Object value
)
3111 struct Lisp_Symbol
*sym
;
3113 CHECK_SYMBOL (symbol
);
3114 sym
= XSYMBOL (symbol
);
3117 switch (sym
->redirect
)
3119 case SYMBOL_VARALIAS
:
3120 sym
= indirect_variable (sym
); XSETSYMBOL (symbol
, sym
); goto start
;
3121 case SYMBOL_PLAINVAL
:
3122 /* The most common case is that of a non-constant symbol with a
3123 trivial value. Make that as fast as we can. */
3124 specpdl_ptr
->let
.kind
= SPECPDL_LET
;
3125 specpdl_ptr
->let
.symbol
= symbol
;
3126 specpdl_ptr
->let
.old_value
= SYMBOL_VAL (sym
);
3129 SET_SYMBOL_VAL (sym
, value
);
3131 set_internal (symbol
, value
, Qnil
, 1);
3133 case SYMBOL_LOCALIZED
:
3134 if (SYMBOL_BLV (sym
)->frame_local
)
3135 error ("Frame-local vars cannot be let-bound");
3136 case SYMBOL_FORWARDED
:
3138 Lisp_Object ovalue
= find_symbol_value (symbol
);
3139 specpdl_ptr
->let
.kind
= SPECPDL_LET_LOCAL
;
3140 specpdl_ptr
->let
.symbol
= symbol
;
3141 specpdl_ptr
->let
.old_value
= ovalue
;
3142 specpdl_ptr
->let
.where
= Fcurrent_buffer ();
3144 eassert (sym
->redirect
!= SYMBOL_LOCALIZED
3145 || (EQ (SYMBOL_BLV (sym
)->where
, Fcurrent_buffer ())));
3147 if (sym
->redirect
== SYMBOL_LOCALIZED
)
3149 if (!blv_found (SYMBOL_BLV (sym
)))
3150 specpdl_ptr
->let
.kind
= SPECPDL_LET_DEFAULT
;
3152 else if (BUFFER_OBJFWDP (SYMBOL_FWD (sym
)))
3154 /* If SYMBOL is a per-buffer variable which doesn't have a
3155 buffer-local value here, make the `let' change the global
3156 value by changing the value of SYMBOL in all buffers not
3157 having their own value. This is consistent with what
3158 happens with other buffer-local variables. */
3159 if (NILP (Flocal_variable_p (symbol
, Qnil
)))
3161 specpdl_ptr
->let
.kind
= SPECPDL_LET_DEFAULT
;
3163 Fset_default (symbol
, value
);
3168 specpdl_ptr
->let
.kind
= SPECPDL_LET
;
3171 set_internal (symbol
, value
, Qnil
, 1);
3174 default: emacs_abort ();
3178 /* Push unwind-protect entries of various types. */
3181 record_unwind_protect (void (*function
) (Lisp_Object
), Lisp_Object arg
)
3183 specpdl_ptr
->unwind
.kind
= SPECPDL_UNWIND
;
3184 specpdl_ptr
->unwind
.func
= function
;
3185 specpdl_ptr
->unwind
.arg
= arg
;
3190 record_unwind_protect_ptr (void (*function
) (void *), void *arg
)
3192 specpdl_ptr
->unwind_ptr
.kind
= SPECPDL_UNWIND_PTR
;
3193 specpdl_ptr
->unwind_ptr
.func
= function
;
3194 specpdl_ptr
->unwind_ptr
.arg
= arg
;
3199 record_unwind_protect_int (void (*function
) (int), int arg
)
3201 specpdl_ptr
->unwind_int
.kind
= SPECPDL_UNWIND_INT
;
3202 specpdl_ptr
->unwind_int
.func
= function
;
3203 specpdl_ptr
->unwind_int
.arg
= arg
;
3208 record_unwind_protect_void (void (*function
) (void))
3210 specpdl_ptr
->unwind_void
.kind
= SPECPDL_UNWIND_VOID
;
3211 specpdl_ptr
->unwind_void
.func
= function
;
3219 /* Push an unwind-protect entry that does nothing, so that
3220 set_unwind_protect_ptr can overwrite it later. */
3223 record_unwind_protect_nothing (void)
3225 record_unwind_protect_void (do_nothing
);
3228 /* Clear the unwind-protect entry COUNT, so that it does nothing.
3229 It need not be at the top of the stack. */
3232 clear_unwind_protect (ptrdiff_t count
)
3234 union specbinding
*p
= specpdl
+ count
;
3235 p
->unwind_void
.kind
= SPECPDL_UNWIND_VOID
;
3236 p
->unwind_void
.func
= do_nothing
;
3239 /* Set the unwind-protect entry COUNT so that it invokes FUNC (ARG).
3240 It need not be at the top of the stack. Discard the entry's
3241 previous value without invoking it. */
3244 set_unwind_protect (ptrdiff_t count
, void (*func
) (Lisp_Object
),
3247 union specbinding
*p
= specpdl
+ count
;
3248 p
->unwind
.kind
= SPECPDL_UNWIND
;
3249 p
->unwind
.func
= func
;
3250 p
->unwind
.arg
= arg
;
3254 set_unwind_protect_ptr (ptrdiff_t count
, void (*func
) (void *), void *arg
)
3256 union specbinding
*p
= specpdl
+ count
;
3257 p
->unwind_ptr
.kind
= SPECPDL_UNWIND_PTR
;
3258 p
->unwind_ptr
.func
= func
;
3259 p
->unwind_ptr
.arg
= arg
;
3262 /* Pop and execute entries from the unwind-protect stack until the
3263 depth COUNT is reached. Return VALUE. */
3266 unbind_to (ptrdiff_t count
, Lisp_Object value
)
3268 Lisp_Object quitf
= Vquit_flag
;
3269 struct gcpro gcpro1
, gcpro2
;
3271 GCPRO2 (value
, quitf
);
3274 while (specpdl_ptr
!= specpdl
+ count
)
3276 /* Decrement specpdl_ptr before we do the work to unbind it, so
3277 that an error in unbinding won't try to unbind the same entry
3278 again. Take care to copy any parts of the binding needed
3279 before invoking any code that can make more bindings. */
3283 switch (specpdl_ptr
->kind
)
3285 case SPECPDL_UNWIND
:
3286 specpdl_ptr
->unwind
.func (specpdl_ptr
->unwind
.arg
);
3288 case SPECPDL_UNWIND_PTR
:
3289 specpdl_ptr
->unwind_ptr
.func (specpdl_ptr
->unwind_ptr
.arg
);
3291 case SPECPDL_UNWIND_INT
:
3292 specpdl_ptr
->unwind_int
.func (specpdl_ptr
->unwind_int
.arg
);
3294 case SPECPDL_UNWIND_VOID
:
3295 specpdl_ptr
->unwind_void
.func ();
3297 case SPECPDL_BACKTRACE
:
3300 { /* If variable has a trivial value (no forwarding), we can
3301 just set it. No need to check for constant symbols here,
3302 since that was already done by specbind. */
3303 struct Lisp_Symbol
*sym
= XSYMBOL (specpdl_symbol (specpdl_ptr
));
3304 if (sym
->redirect
== SYMBOL_PLAINVAL
)
3306 SET_SYMBOL_VAL (sym
, specpdl_old_value (specpdl_ptr
));
3311 NOTE: we only ever come here if make_local_foo was used for
3312 the first time on this var within this let. */
3315 case SPECPDL_LET_DEFAULT
:
3316 Fset_default (specpdl_symbol (specpdl_ptr
),
3317 specpdl_old_value (specpdl_ptr
));
3319 case SPECPDL_LET_LOCAL
:
3321 Lisp_Object symbol
= specpdl_symbol (specpdl_ptr
);
3322 Lisp_Object where
= specpdl_where (specpdl_ptr
);
3323 Lisp_Object old_value
= specpdl_old_value (specpdl_ptr
);
3324 eassert (BUFFERP (where
));
3326 /* If this was a local binding, reset the value in the appropriate
3327 buffer, but only if that buffer's binding still exists. */
3328 if (!NILP (Flocal_variable_p (symbol
, where
)))
3329 set_internal (symbol
, old_value
, where
, 1);
3335 if (NILP (Vquit_flag
) && !NILP (quitf
))
3342 DEFUN ("special-variable-p", Fspecial_variable_p
, Sspecial_variable_p
, 1, 1, 0,
3343 doc
: /* Return non-nil if SYMBOL's global binding has been declared special.
3344 A special variable is one that will be bound dynamically, even in a
3345 context where binding is lexical by default. */)
3346 (Lisp_Object symbol
)
3348 CHECK_SYMBOL (symbol
);
3349 return XSYMBOL (symbol
)->declared_special
? Qt
: Qnil
;
3353 DEFUN ("backtrace-debug", Fbacktrace_debug
, Sbacktrace_debug
, 2, 2, 0,
3354 doc
: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.
3355 The debugger is entered when that frame exits, if the flag is non-nil. */)
3356 (Lisp_Object level
, Lisp_Object flag
)
3358 union specbinding
*pdl
= backtrace_top ();
3359 register EMACS_INT i
;
3361 CHECK_NUMBER (level
);
3363 for (i
= 0; backtrace_p (pdl
) && i
< XINT (level
); i
++)
3364 pdl
= backtrace_next (pdl
);
3366 if (backtrace_p (pdl
))
3367 set_backtrace_debug_on_exit (pdl
, !NILP (flag
));
3372 DEFUN ("backtrace", Fbacktrace
, Sbacktrace
, 0, 0, "",
3373 doc
: /* Print a trace of Lisp function calls currently active.
3374 Output stream used is value of `standard-output'. */)
3377 union specbinding
*pdl
= backtrace_top ();
3379 Lisp_Object old_print_level
= Vprint_level
;
3381 if (NILP (Vprint_level
))
3382 XSETFASTINT (Vprint_level
, 8);
3384 while (backtrace_p (pdl
))
3386 write_string (backtrace_debug_on_exit (pdl
) ? "* " : " ", 2);
3387 if (backtrace_nargs (pdl
) == UNEVALLED
)
3389 Fprin1 (Fcons (backtrace_function (pdl
), *backtrace_args (pdl
)),
3391 write_string ("\n", -1);
3395 tem
= backtrace_function (pdl
);
3396 Fprin1 (tem
, Qnil
); /* This can QUIT. */
3397 write_string ("(", -1);
3400 for (i
= 0; i
< backtrace_nargs (pdl
); i
++)
3402 if (i
) write_string (" ", -1);
3403 Fprin1 (backtrace_args (pdl
)[i
], Qnil
);
3406 write_string (")\n", -1);
3408 pdl
= backtrace_next (pdl
);
3411 Vprint_level
= old_print_level
;
3415 static union specbinding
*
3416 get_backtrace_frame (Lisp_Object nframes
, Lisp_Object base
)
3418 union specbinding
*pdl
= backtrace_top ();
3419 register EMACS_INT i
;
3421 CHECK_NATNUM (nframes
);
3424 { /* Skip up to `base'. */
3425 base
= Findirect_function (base
, Qt
);
3426 while (backtrace_p (pdl
)
3427 && !EQ (base
, Findirect_function (backtrace_function (pdl
), Qt
)))
3428 pdl
= backtrace_next (pdl
);
3431 /* Find the frame requested. */
3432 for (i
= XFASTINT (nframes
); i
> 0 && backtrace_p (pdl
); i
--)
3433 pdl
= backtrace_next (pdl
);
3438 DEFUN ("backtrace-frame", Fbacktrace_frame
, Sbacktrace_frame
, 1, 2, NULL
,
3439 doc
: /* Return the function and arguments NFRAMES up from current execution point.
3440 If that frame has not evaluated the arguments yet (or is a special form),
3441 the value is (nil FUNCTION ARG-FORMS...).
3442 If that frame has evaluated its arguments and called its function already,
3443 the value is (t FUNCTION ARG-VALUES...).
3444 A &rest arg is represented as the tail of the list ARG-VALUES.
3445 FUNCTION is whatever was supplied as car of evaluated list,
3446 or a lambda expression for macro calls.
3447 If NFRAMES is more than the number of frames, the value is nil.
3448 If BASE is non-nil, it should be a function and NFRAMES counts from its
3449 nearest activation frame. */)
3450 (Lisp_Object nframes
, Lisp_Object base
)
3452 union specbinding
*pdl
= get_backtrace_frame (nframes
, base
);
3454 if (!backtrace_p (pdl
))
3456 if (backtrace_nargs (pdl
) == UNEVALLED
)
3458 Fcons (backtrace_function (pdl
), *backtrace_args (pdl
)));
3461 Lisp_Object tem
= Flist (backtrace_nargs (pdl
), backtrace_args (pdl
));
3463 return Fcons (Qt
, Fcons (backtrace_function (pdl
), tem
));
3467 /* For backtrace-eval, we want to temporarily unwind the last few elements of
3468 the specpdl stack, and then rewind them. We store the pre-unwind values
3469 directly in the pre-existing specpdl elements (i.e. we swap the current
3470 value and the old value stored in the specpdl), kind of like the inplace
3471 pointer-reversal trick. As it turns out, the rewind does the same as the
3472 unwind, except it starts from the other end of the specpdl stack, so we use
3473 the same function for both unwind and rewind. */
3475 backtrace_eval_unrewind (int distance
)
3477 union specbinding
*tmp
= specpdl_ptr
;
3480 { /* It's a rewind rather than unwind. */
3481 tmp
+= distance
- 1;
3483 distance
= -distance
;
3486 for (; distance
> 0; distance
--)
3492 /* FIXME: Ideally we'd like to "temporarily unwind" (some of) those
3493 unwind_protect, but the problem is that we don't know how to
3494 rewind them afterwards. */
3495 case SPECPDL_UNWIND
:
3496 case SPECPDL_UNWIND_PTR
:
3497 case SPECPDL_UNWIND_INT
:
3498 case SPECPDL_UNWIND_VOID
:
3499 case SPECPDL_BACKTRACE
:
3502 { /* If variable has a trivial value (no forwarding), we can
3503 just set it. No need to check for constant symbols here,
3504 since that was already done by specbind. */
3505 struct Lisp_Symbol
*sym
= XSYMBOL (specpdl_symbol (tmp
));
3506 if (sym
->redirect
== SYMBOL_PLAINVAL
)
3508 Lisp_Object old_value
= specpdl_old_value (tmp
);
3509 set_specpdl_old_value (tmp
, SYMBOL_VAL (sym
));
3510 SET_SYMBOL_VAL (sym
, old_value
);
3515 NOTE: we only ever come here if make_local_foo was used for
3516 the first time on this var within this let. */
3519 case SPECPDL_LET_DEFAULT
:
3521 Lisp_Object sym
= specpdl_symbol (tmp
);
3522 Lisp_Object old_value
= specpdl_old_value (tmp
);
3523 set_specpdl_old_value (tmp
, Fdefault_value (sym
));
3524 Fset_default (sym
, old_value
);
3527 case SPECPDL_LET_LOCAL
:
3529 Lisp_Object symbol
= specpdl_symbol (tmp
);
3530 Lisp_Object where
= specpdl_where (tmp
);
3531 Lisp_Object old_value
= specpdl_old_value (tmp
);
3532 eassert (BUFFERP (where
));
3534 /* If this was a local binding, reset the value in the appropriate
3535 buffer, but only if that buffer's binding still exists. */
3536 if (!NILP (Flocal_variable_p (symbol
, where
)))
3538 set_specpdl_old_value
3539 (tmp
, Fbuffer_local_value (symbol
, where
));
3540 set_internal (symbol
, old_value
, where
, 1);
3548 DEFUN ("backtrace-eval", Fbacktrace_eval
, Sbacktrace_eval
, 2, 3, NULL
,
3549 doc
: /* Evaluate EXP in the context of some activation frame.
3550 NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */)
3551 (Lisp_Object exp
, Lisp_Object nframes
, Lisp_Object base
)
3553 union specbinding
*pdl
= get_backtrace_frame (nframes
, base
);
3554 ptrdiff_t count
= SPECPDL_INDEX ();
3555 ptrdiff_t distance
= specpdl_ptr
- pdl
;
3556 eassert (distance
>= 0);
3558 if (!backtrace_p (pdl
))
3559 error ("Activation frame not found!");
3561 backtrace_eval_unrewind (distance
);
3562 record_unwind_protect_int (backtrace_eval_unrewind
, -distance
);
3564 /* Use eval_sub rather than Feval since the main motivation behind
3565 backtrace-eval is to be able to get/set the value of lexical variables
3566 from the debugger. */
3567 return unbind_to (count
, eval_sub (exp
));
3570 DEFUN ("backtrace--locals", Fbacktrace__locals
, Sbacktrace__locals
, 1, 2, NULL
,
3571 doc
: /* Return names and values of local variables of a stack frame.
3572 NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */)
3573 (Lisp_Object nframes
, Lisp_Object base
)
3575 union specbinding
*frame
= get_backtrace_frame (nframes
, base
);
3576 union specbinding
*prevframe
3577 = get_backtrace_frame (make_number (XFASTINT (nframes
) - 1), base
);
3578 ptrdiff_t distance
= specpdl_ptr
- frame
;
3579 Lisp_Object result
= Qnil
;
3580 eassert (distance
>= 0);
3582 if (!backtrace_p (prevframe
))
3583 error ("Activation frame not found!");
3584 if (!backtrace_p (frame
))
3585 error ("Activation frame not found!");
3587 /* The specpdl entries normally contain the symbol being bound along with its
3588 `old_value', so it can be restored. The new value to which it is bound is
3589 available in one of two places: either in the current value of the
3590 variable (if it hasn't been rebound yet) or in the `old_value' slot of the
3591 next specpdl entry for it.
3592 `backtrace_eval_unrewind' happens to swap the role of `old_value'
3593 and "new value", so we abuse it here, to fetch the new value.
3594 It's ugly (we'd rather not modify global data) and a bit inefficient,
3595 but it does the job for now. */
3596 backtrace_eval_unrewind (distance
);
3600 union specbinding
*tmp
= prevframe
;
3601 for (; tmp
> frame
; tmp
--)
3606 case SPECPDL_LET_DEFAULT
:
3607 case SPECPDL_LET_LOCAL
:
3609 Lisp_Object sym
= specpdl_symbol (tmp
);
3610 Lisp_Object val
= specpdl_old_value (tmp
);
3611 if (EQ (sym
, Qinternal_interpreter_environment
))
3613 Lisp_Object env
= val
;
3614 for (; CONSP (env
); env
= XCDR (env
))
3616 Lisp_Object binding
= XCAR (env
);
3617 if (CONSP (binding
))
3618 result
= Fcons (Fcons (XCAR (binding
),
3624 result
= Fcons (Fcons (sym
, val
), result
);
3630 /* Restore values from specpdl to original place. */
3631 backtrace_eval_unrewind (-distance
);
3638 get_backtrace (Lisp_Object array
)
3640 union specbinding
*pdl
= backtrace_next (backtrace_top ());
3641 ptrdiff_t i
= 0, asize
= ASIZE (array
);
3643 /* Copy the backtrace contents into working memory. */
3644 for (; i
< asize
; i
++)
3646 if (backtrace_p (pdl
))
3648 ASET (array
, i
, backtrace_function (pdl
));
3649 pdl
= backtrace_next (pdl
);
3652 ASET (array
, i
, Qnil
);
3656 Lisp_Object
backtrace_top_function (void)
3658 union specbinding
*pdl
= backtrace_top ();
3659 return (backtrace_p (pdl
) ? backtrace_function (pdl
) : Qnil
);
3667 DEFVAR_INT ("max-specpdl-size", max_specpdl_size
,
3668 doc
: /* Limit on number of Lisp variable bindings and `unwind-protect's.
3669 If Lisp code tries to increase the total number past this amount,
3670 an error is signaled.
3671 You can safely use a value considerably larger than the default value,
3672 if that proves inconveniently small. However, if you increase it too far,
3673 Emacs could run out of memory trying to make the stack bigger.
3674 Note that this limit may be silently increased by the debugger
3675 if `debug-on-error' or `debug-on-quit' is set. */);
3677 DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth
,
3678 doc
: /* Limit on depth in `eval', `apply' and `funcall' before error.
3680 This limit serves to catch infinite recursions for you before they cause
3681 actual stack overflow in C, which would be fatal for Emacs.
3682 You can safely make it considerably larger than its default value,
3683 if that proves inconveniently small. However, if you increase it too far,
3684 Emacs could overflow the real C stack, and crash. */);
3686 DEFVAR_LISP ("quit-flag", Vquit_flag
,
3687 doc
: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.
3688 If the value is t, that means do an ordinary quit.
3689 If the value equals `throw-on-input', that means quit by throwing
3690 to the tag specified in `throw-on-input'; it's for handling `while-no-input'.
3691 Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit',
3692 but `inhibit-quit' non-nil prevents anything from taking notice of that. */);
3695 DEFVAR_LISP ("inhibit-quit", Vinhibit_quit
,
3696 doc
: /* Non-nil inhibits C-g quitting from happening immediately.
3697 Note that `quit-flag' will still be set by typing C-g,
3698 so a quit will be signaled as soon as `inhibit-quit' is nil.
3699 To prevent this happening, set `quit-flag' to nil
3700 before making `inhibit-quit' nil. */);
3701 Vinhibit_quit
= Qnil
;
3703 DEFSYM (Qinhibit_quit
, "inhibit-quit");
3704 DEFSYM (Qautoload
, "autoload");
3705 DEFSYM (Qinhibit_debugger
, "inhibit-debugger");
3706 DEFSYM (Qmacro
, "macro");
3707 DEFSYM (Qdeclare
, "declare");
3709 /* Note that the process handling also uses Qexit, but we don't want
3710 to staticpro it twice, so we just do it here. */
3711 DEFSYM (Qexit
, "exit");
3713 DEFSYM (Qinteractive
, "interactive");
3714 DEFSYM (Qcommandp
, "commandp");
3715 DEFSYM (Qand_rest
, "&rest");
3716 DEFSYM (Qand_optional
, "&optional");
3717 DEFSYM (Qclosure
, "closure");
3718 DEFSYM (Qdebug
, "debug");
3720 DEFVAR_LISP ("inhibit-debugger", Vinhibit_debugger
,
3721 doc
: /* Non-nil means never enter the debugger.
3722 Normally set while the debugger is already active, to avoid recursive
3724 Vinhibit_debugger
= Qnil
;
3726 DEFVAR_LISP ("debug-on-error", Vdebug_on_error
,
3727 doc
: /* Non-nil means enter debugger if an error is signaled.
3728 Does not apply to errors handled by `condition-case' or those
3729 matched by `debug-ignored-errors'.
3730 If the value is a list, an error only means to enter the debugger
3731 if one of its condition symbols appears in the list.
3732 When you evaluate an expression interactively, this variable
3733 is temporarily non-nil if `eval-expression-debug-on-error' is non-nil.
3734 The command `toggle-debug-on-error' toggles this.
3735 See also the variable `debug-on-quit' and `inhibit-debugger'. */);
3736 Vdebug_on_error
= Qnil
;
3738 DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors
,
3739 doc
: /* List of errors for which the debugger should not be called.
3740 Each element may be a condition-name or a regexp that matches error messages.
3741 If any element applies to a given error, that error skips the debugger
3742 and just returns to top level.
3743 This overrides the variable `debug-on-error'.
3744 It does not apply to errors handled by `condition-case'. */);
3745 Vdebug_ignored_errors
= Qnil
;
3747 DEFVAR_BOOL ("debug-on-quit", debug_on_quit
,
3748 doc
: /* Non-nil means enter debugger if quit is signaled (C-g, for example).
3749 Does not apply if quit is handled by a `condition-case'. */);
3752 DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call
,
3753 doc
: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */);
3755 DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue
,
3756 doc
: /* Non-nil means debugger may continue execution.
3757 This is nil when the debugger is called under circumstances where it
3758 might not be safe to continue. */);
3759 debugger_may_continue
= 1;
3761 DEFVAR_LISP ("debugger", Vdebugger
,
3762 doc
: /* Function to call to invoke debugger.
3763 If due to frame exit, args are `exit' and the value being returned;
3764 this function's value will be returned instead of that.
3765 If due to error, args are `error' and a list of the args to `signal'.
3766 If due to `apply' or `funcall' entry, one arg, `lambda'.
3767 If due to `eval' entry, one arg, t. */);
3770 DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function
,
3771 doc
: /* If non-nil, this is a function for `signal' to call.
3772 It receives the same arguments that `signal' was given.
3773 The Edebug package uses this to regain control. */);
3774 Vsignal_hook_function
= Qnil
;
3776 DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal
,
3777 doc
: /* Non-nil means call the debugger regardless of condition handlers.
3778 Note that `debug-on-error', `debug-on-quit' and friends
3779 still determine whether to handle the particular condition. */);
3780 Vdebug_on_signal
= Qnil
;
3782 /* When lexical binding is being used,
3783 Vinternal_interpreter_environment is non-nil, and contains an alist
3784 of lexically-bound variable, or (t), indicating an empty
3785 environment. The lisp name of this variable would be
3786 `internal-interpreter-environment' if it weren't hidden.
3787 Every element of this list can be either a cons (VAR . VAL)
3788 specifying a lexical binding, or a single symbol VAR indicating
3789 that this variable should use dynamic scoping. */
3790 DEFSYM (Qinternal_interpreter_environment
,
3791 "internal-interpreter-environment");
3792 DEFVAR_LISP ("internal-interpreter-environment",
3793 Vinternal_interpreter_environment
,
3794 doc
: /* If non-nil, the current lexical environment of the lisp interpreter.
3795 When lexical binding is not being used, this variable is nil.
3796 A value of `(t)' indicates an empty environment, otherwise it is an
3797 alist of active lexical bindings. */);
3798 Vinternal_interpreter_environment
= Qnil
;
3799 /* Don't export this variable to Elisp, so no one can mess with it
3800 (Just imagine if someone makes it buffer-local). */
3801 Funintern (Qinternal_interpreter_environment
, Qnil
);
3803 DEFSYM (Vrun_hooks
, "run-hooks");
3805 staticpro (&Vautoload_queue
);
3806 Vautoload_queue
= Qnil
;
3807 staticpro (&Vsignaling_function
);
3808 Vsignaling_function
= Qnil
;
3810 inhibit_lisp_code
= Qnil
;