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 byte_stack_list
= catch->byte_stack
;
1172 gcprolist
= catch->gcpro
;
1174 gcpro_level
= gcprolist
? gcprolist
->level
+ 1 : 0;
1176 lisp_eval_depth
= catch->lisp_eval_depth
;
1178 sys_longjmp (catch->jmp
, 1);
1181 DEFUN ("throw", Fthrow
, Sthrow
, 2, 2, 0,
1182 doc
: /* Throw to the catch for TAG and return VALUE from it.
1183 Both TAG and VALUE are evalled. */)
1184 (register Lisp_Object tag
, Lisp_Object value
)
1189 for (c
= handlerlist
; c
; c
= c
->next
)
1191 if (c
->type
== CATCHER
&& EQ (c
->tag_or_ch
, tag
))
1192 unwind_to_catch (c
, value
);
1194 xsignal2 (Qno_catch
, tag
, value
);
1198 DEFUN ("unwind-protect", Funwind_protect
, Sunwind_protect
, 1, UNEVALLED
, 0,
1199 doc
: /* Do BODYFORM, protecting with UNWINDFORMS.
1200 If BODYFORM completes normally, its value is returned
1201 after executing the UNWINDFORMS.
1202 If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.
1203 usage: (unwind-protect BODYFORM UNWINDFORMS...) */)
1207 ptrdiff_t count
= SPECPDL_INDEX ();
1209 record_unwind_protect (unwind_body
, XCDR (args
));
1210 val
= eval_sub (XCAR (args
));
1211 return unbind_to (count
, val
);
1214 DEFUN ("condition-case", Fcondition_case
, Scondition_case
, 2, UNEVALLED
, 0,
1215 doc
: /* Regain control when an error is signaled.
1216 Executes BODYFORM and returns its value if no error happens.
1217 Each element of HANDLERS looks like (CONDITION-NAME BODY...)
1218 where the BODY is made of Lisp expressions.
1220 A handler is applicable to an error
1221 if CONDITION-NAME is one of the error's condition names.
1222 If an error happens, the first applicable handler is run.
1224 The car of a handler may be a list of condition names instead of a
1225 single condition name; then it handles all of them. If the special
1226 condition name `debug' is present in this list, it allows another
1227 condition in the list to run the debugger if `debug-on-error' and the
1228 other usual mechanisms says it should (otherwise, `condition-case'
1229 suppresses the debugger).
1231 When a handler handles an error, control returns to the `condition-case'
1232 and it executes the handler's BODY...
1233 with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error.
1234 \(If VAR is nil, the handler can't access that information.)
1235 Then the value of the last BODY form is returned from the `condition-case'
1238 See also the function `signal' for more info.
1239 usage: (condition-case VAR BODYFORM &rest HANDLERS) */)
1242 Lisp_Object var
= XCAR (args
);
1243 Lisp_Object bodyform
= XCAR (XCDR (args
));
1244 Lisp_Object handlers
= XCDR (XCDR (args
));
1246 return internal_lisp_condition_case (var
, bodyform
, handlers
);
1249 /* Like Fcondition_case, but the args are separate
1250 rather than passed in a list. Used by Fbyte_code. */
1253 internal_lisp_condition_case (volatile Lisp_Object var
, Lisp_Object bodyform
,
1254 Lisp_Object handlers
)
1258 struct handler
*oldhandlerlist
= handlerlist
;
1263 for (val
= handlers
; CONSP (val
); val
= XCDR (val
))
1265 Lisp_Object tem
= XCAR (val
);
1269 && (SYMBOLP (XCAR (tem
))
1270 || CONSP (XCAR (tem
))))))
1271 error ("Invalid condition handler: %s",
1272 SDATA (Fprin1_to_string (tem
, Qt
)));
1275 { /* The first clause is the one that should be checked first, so it should
1276 be added to handlerlist last. So we build in `clauses' a table that
1277 contains `handlers' but in reverse order. */
1278 Lisp_Object
*clauses
= alloca (clausenb
* sizeof (Lisp_Object
*));
1279 Lisp_Object
*volatile clauses_volatile
= clauses
;
1281 for (val
= handlers
; CONSP (val
); val
= XCDR (val
))
1282 clauses
[--i
] = XCAR (val
);
1283 for (i
= 0; i
< clausenb
; i
++)
1285 Lisp_Object clause
= clauses
[i
];
1286 Lisp_Object condition
= XCAR (clause
);
1287 if (!CONSP (condition
))
1288 condition
= Fcons (condition
, Qnil
);
1289 PUSH_HANDLER (c
, condition
, CONDITION_CASE
);
1290 if (sys_setjmp (c
->jmp
))
1292 ptrdiff_t count
= SPECPDL_INDEX ();
1293 Lisp_Object val
= handlerlist
->val
;
1294 Lisp_Object
*chosen_clause
= clauses_volatile
;
1295 for (c
= handlerlist
->next
; c
!= oldhandlerlist
; c
= c
->next
)
1297 handlerlist
= oldhandlerlist
;
1300 if (!NILP (Vinternal_interpreter_environment
))
1301 specbind (Qinternal_interpreter_environment
,
1302 Fcons (Fcons (var
, val
),
1303 Vinternal_interpreter_environment
));
1305 specbind (var
, val
);
1307 val
= Fprogn (XCDR (*chosen_clause
));
1308 /* Note that this just undoes the binding of var; whoever
1309 longjumped to us unwound the stack to c.pdlcount before
1312 unbind_to (count
, Qnil
);
1318 val
= eval_sub (bodyform
);
1319 handlerlist
= oldhandlerlist
;
1323 /* Call the function BFUN with no arguments, catching errors within it
1324 according to HANDLERS. If there is an error, call HFUN with
1325 one argument which is the data that describes the error:
1328 HANDLERS can be a list of conditions to catch.
1329 If HANDLERS is Qt, catch all errors.
1330 If HANDLERS is Qerror, catch all errors
1331 but allow the debugger to run if that is enabled. */
1334 internal_condition_case (Lisp_Object (*bfun
) (void), Lisp_Object handlers
,
1335 Lisp_Object (*hfun
) (Lisp_Object
))
1340 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1341 if (sys_setjmp (c
->jmp
))
1343 Lisp_Object val
= handlerlist
->val
;
1344 clobbered_eassert (handlerlist
== c
);
1345 handlerlist
= handlerlist
->next
;
1346 return (*hfun
) (val
);
1350 clobbered_eassert (handlerlist
== c
);
1351 handlerlist
= handlerlist
->next
;
1355 /* Like internal_condition_case but call BFUN with ARG as its argument. */
1358 internal_condition_case_1 (Lisp_Object (*bfun
) (Lisp_Object
), Lisp_Object arg
,
1359 Lisp_Object handlers
, Lisp_Object (*hfun
) (Lisp_Object
))
1364 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1365 if (sys_setjmp (c
->jmp
))
1367 Lisp_Object val
= handlerlist
->val
;
1368 clobbered_eassert (handlerlist
== c
);
1369 handlerlist
= handlerlist
->next
;
1370 return (*hfun
) (val
);
1373 val
= (*bfun
) (arg
);
1374 clobbered_eassert (handlerlist
== c
);
1375 handlerlist
= handlerlist
->next
;
1379 /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as
1383 internal_condition_case_2 (Lisp_Object (*bfun
) (Lisp_Object
, Lisp_Object
),
1386 Lisp_Object handlers
,
1387 Lisp_Object (*hfun
) (Lisp_Object
))
1392 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1393 if (sys_setjmp (c
->jmp
))
1395 Lisp_Object val
= handlerlist
->val
;
1396 clobbered_eassert (handlerlist
== c
);
1397 handlerlist
= handlerlist
->next
;
1398 return (*hfun
) (val
);
1401 val
= (*bfun
) (arg1
, arg2
);
1402 clobbered_eassert (handlerlist
== c
);
1403 handlerlist
= handlerlist
->next
;
1407 /* Like internal_condition_case but call BFUN with NARGS as first,
1408 and ARGS as second argument. */
1411 internal_condition_case_n (Lisp_Object (*bfun
) (ptrdiff_t, Lisp_Object
*),
1414 Lisp_Object handlers
,
1415 Lisp_Object (*hfun
) (Lisp_Object err
,
1422 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1423 if (sys_setjmp (c
->jmp
))
1425 Lisp_Object val
= handlerlist
->val
;
1426 clobbered_eassert (handlerlist
== c
);
1427 handlerlist
= handlerlist
->next
;
1428 return (*hfun
) (val
, nargs
, args
);
1431 val
= (*bfun
) (nargs
, args
);
1432 clobbered_eassert (handlerlist
== c
);
1433 handlerlist
= handlerlist
->next
;
1438 static Lisp_Object
find_handler_clause (Lisp_Object
, Lisp_Object
);
1439 static bool maybe_call_debugger (Lisp_Object conditions
, Lisp_Object sig
,
1443 process_quit_flag (void)
1445 Lisp_Object flag
= Vquit_flag
;
1447 if (EQ (flag
, Qkill_emacs
))
1449 if (EQ (Vthrow_on_input
, flag
))
1450 Fthrow (Vthrow_on_input
, Qt
);
1451 Fsignal (Qquit
, Qnil
);
1454 DEFUN ("signal", Fsignal
, Ssignal
, 2, 2, 0,
1455 doc
: /* Signal an error. Args are ERROR-SYMBOL and associated DATA.
1456 This function does not return.
1458 An error symbol is a symbol with an `error-conditions' property
1459 that is a list of condition names.
1460 A handler for any of those names will get to handle this signal.
1461 The symbol `error' should normally be one of them.
1463 DATA should be a list. Its elements are printed as part of the error message.
1464 See Info anchor `(elisp)Definition of signal' for some details on how this
1465 error message is constructed.
1466 If the signal is handled, DATA is made available to the handler.
1467 See also the function `condition-case'. */)
1468 (Lisp_Object error_symbol
, Lisp_Object data
)
1470 /* When memory is full, ERROR-SYMBOL is nil,
1471 and DATA is (REAL-ERROR-SYMBOL . REAL-DATA).
1472 That is a special case--don't do this in other situations. */
1473 Lisp_Object conditions
;
1475 Lisp_Object real_error_symbol
1476 = (NILP (error_symbol
) ? Fcar (data
) : error_symbol
);
1477 register Lisp_Object clause
= Qnil
;
1482 if (gc_in_progress
|| waiting_for_input
)
1485 #if 0 /* rms: I don't know why this was here,
1486 but it is surely wrong for an error that is handled. */
1487 #ifdef HAVE_WINDOW_SYSTEM
1488 if (display_hourglass_p
)
1489 cancel_hourglass ();
1493 /* This hook is used by edebug. */
1494 if (! NILP (Vsignal_hook_function
)
1495 && ! NILP (error_symbol
))
1497 /* Edebug takes care of restoring these variables when it exits. */
1498 if (lisp_eval_depth
+ 20 > max_lisp_eval_depth
)
1499 max_lisp_eval_depth
= lisp_eval_depth
+ 20;
1501 if (SPECPDL_INDEX () + 40 > max_specpdl_size
)
1502 max_specpdl_size
= SPECPDL_INDEX () + 40;
1504 call2 (Vsignal_hook_function
, error_symbol
, data
);
1507 conditions
= Fget (real_error_symbol
, Qerror_conditions
);
1509 /* Remember from where signal was called. Skip over the frame for
1510 `signal' itself. If a frame for `error' follows, skip that,
1511 too. Don't do this when ERROR_SYMBOL is nil, because that
1512 is a memory-full error. */
1513 Vsignaling_function
= Qnil
;
1514 if (!NILP (error_symbol
))
1516 union specbinding
*pdl
= backtrace_next (backtrace_top ());
1517 if (backtrace_p (pdl
) && EQ (backtrace_function (pdl
), Qerror
))
1518 pdl
= backtrace_next (pdl
);
1519 if (backtrace_p (pdl
))
1520 Vsignaling_function
= backtrace_function (pdl
);
1523 for (h
= handlerlist
; h
; h
= h
->next
)
1525 if (h
->type
!= CONDITION_CASE
)
1527 clause
= find_handler_clause (h
->tag_or_ch
, conditions
);
1532 if (/* Don't run the debugger for a memory-full error.
1533 (There is no room in memory to do that!) */
1534 !NILP (error_symbol
)
1535 && (!NILP (Vdebug_on_signal
)
1536 /* If no handler is present now, try to run the debugger. */
1538 /* A `debug' symbol in the handler list disables the normal
1539 suppression of the debugger. */
1540 || (CONSP (clause
) && CONSP (clause
)
1541 && !NILP (Fmemq (Qdebug
, clause
)))
1542 /* Special handler that means "print a message and run debugger
1544 || EQ (h
->tag_or_ch
, Qerror
)))
1546 bool debugger_called
1547 = maybe_call_debugger (conditions
, error_symbol
, data
);
1548 /* We can't return values to code which signaled an error, but we
1549 can continue code which has signaled a quit. */
1550 if (debugger_called
&& EQ (real_error_symbol
, Qquit
))
1556 Lisp_Object unwind_data
1557 = (NILP (error_symbol
) ? data
: Fcons (error_symbol
, data
));
1559 unwind_to_catch (h
, unwind_data
);
1563 if (handlerlist
!= &handlerlist_sentinel
)
1564 /* FIXME: This will come right back here if there's no `top-level'
1565 catcher. A better solution would be to abort here, and instead
1566 add a catch-all condition handler so we never come here. */
1567 Fthrow (Qtop_level
, Qt
);
1570 if (! NILP (error_symbol
))
1571 data
= Fcons (error_symbol
, data
);
1573 string
= Ferror_message_string (data
);
1574 fatal ("%s", SDATA (string
));
1577 /* Internal version of Fsignal that never returns.
1578 Used for anything but Qquit (which can return from Fsignal). */
1581 xsignal (Lisp_Object error_symbol
, Lisp_Object data
)
1583 Fsignal (error_symbol
, data
);
1587 /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */
1590 xsignal0 (Lisp_Object error_symbol
)
1592 xsignal (error_symbol
, Qnil
);
1596 xsignal1 (Lisp_Object error_symbol
, Lisp_Object arg
)
1598 xsignal (error_symbol
, list1 (arg
));
1602 xsignal2 (Lisp_Object error_symbol
, Lisp_Object arg1
, Lisp_Object arg2
)
1604 xsignal (error_symbol
, list2 (arg1
, arg2
));
1608 xsignal3 (Lisp_Object error_symbol
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
)
1610 xsignal (error_symbol
, list3 (arg1
, arg2
, arg3
));
1613 /* Signal `error' with message S, and additional arg ARG.
1614 If ARG is not a genuine list, make it a one-element list. */
1617 signal_error (const char *s
, Lisp_Object arg
)
1619 Lisp_Object tortoise
, hare
;
1621 hare
= tortoise
= arg
;
1622 while (CONSP (hare
))
1629 tortoise
= XCDR (tortoise
);
1631 if (EQ (hare
, tortoise
))
1638 xsignal (Qerror
, Fcons (build_string (s
), arg
));
1642 /* Return true if LIST is a non-nil atom or
1643 a list containing one of CONDITIONS. */
1646 wants_debugger (Lisp_Object list
, Lisp_Object conditions
)
1653 while (CONSP (conditions
))
1655 Lisp_Object
this, tail
;
1656 this = XCAR (conditions
);
1657 for (tail
= list
; CONSP (tail
); tail
= XCDR (tail
))
1658 if (EQ (XCAR (tail
), this))
1660 conditions
= XCDR (conditions
);
1665 /* Return true if an error with condition-symbols CONDITIONS,
1666 and described by SIGNAL-DATA, should skip the debugger
1667 according to debugger-ignored-errors. */
1670 skip_debugger (Lisp_Object conditions
, Lisp_Object data
)
1673 bool first_string
= 1;
1674 Lisp_Object error_message
;
1676 error_message
= Qnil
;
1677 for (tail
= Vdebug_ignored_errors
; CONSP (tail
); tail
= XCDR (tail
))
1679 if (STRINGP (XCAR (tail
)))
1683 error_message
= Ferror_message_string (data
);
1687 if (fast_string_match (XCAR (tail
), error_message
) >= 0)
1692 Lisp_Object contail
;
1694 for (contail
= conditions
; CONSP (contail
); contail
= XCDR (contail
))
1695 if (EQ (XCAR (tail
), XCAR (contail
)))
1703 /* Call the debugger if calling it is currently enabled for CONDITIONS.
1704 SIG and DATA describe the signal. There are two ways to pass them:
1705 = SIG is the error symbol, and DATA is the rest of the data.
1706 = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
1707 This is for memory-full errors only. */
1709 maybe_call_debugger (Lisp_Object conditions
, Lisp_Object sig
, Lisp_Object data
)
1711 Lisp_Object combined_data
;
1713 combined_data
= Fcons (sig
, data
);
1716 /* Don't try to run the debugger with interrupts blocked.
1717 The editing loop would return anyway. */
1718 ! input_blocked_p ()
1719 && NILP (Vinhibit_debugger
)
1720 /* Does user want to enter debugger for this kind of error? */
1723 : wants_debugger (Vdebug_on_error
, conditions
))
1724 && ! skip_debugger (conditions
, combined_data
)
1725 /* RMS: What's this for? */
1726 && when_entered_debugger
< num_nonmacro_input_events
)
1728 call_debugger (list2 (Qerror
, combined_data
));
1736 find_handler_clause (Lisp_Object handlers
, Lisp_Object conditions
)
1738 register Lisp_Object h
;
1740 /* t is used by handlers for all conditions, set up by C code. */
1741 if (EQ (handlers
, Qt
))
1744 /* error is used similarly, but means print an error message
1745 and run the debugger if that is enabled. */
1746 if (EQ (handlers
, Qerror
))
1749 for (h
= handlers
; CONSP (h
); h
= XCDR (h
))
1751 Lisp_Object handler
= XCAR (h
);
1752 if (!NILP (Fmemq (handler
, conditions
)))
1760 /* Dump an error message; called like vprintf. */
1762 verror (const char *m
, va_list ap
)
1765 ptrdiff_t size
= sizeof buf
;
1766 ptrdiff_t size_max
= STRING_BYTES_BOUND
+ 1;
1771 used
= evxprintf (&buffer
, &size
, buf
, size_max
, m
, ap
);
1772 string
= make_string (buffer
, used
);
1776 xsignal1 (Qerror
, string
);
1780 /* Dump an error message; called like printf. */
1784 error (const char *m
, ...)
1791 DEFUN ("commandp", Fcommandp
, Scommandp
, 1, 2, 0,
1792 doc
: /* Non-nil if FUNCTION makes provisions for interactive calling.
1793 This means it contains a description for how to read arguments to give it.
1794 The value is nil for an invalid function or a symbol with no function
1797 Interactively callable functions include strings and vectors (treated
1798 as keyboard macros), lambda-expressions that contain a top-level call
1799 to `interactive', autoload definitions made by `autoload' with non-nil
1800 fourth argument, and some of the built-in functions of Lisp.
1802 Also, a symbol satisfies `commandp' if its function definition does so.
1804 If the optional argument FOR-CALL-INTERACTIVELY is non-nil,
1805 then strings and vectors are not accepted. */)
1806 (Lisp_Object function
, Lisp_Object for_call_interactively
)
1808 register Lisp_Object fun
;
1809 register Lisp_Object funcar
;
1810 Lisp_Object if_prop
= Qnil
;
1814 fun
= indirect_function (fun
); /* Check cycles. */
1818 /* Check an `interactive-form' property if present, analogous to the
1819 function-documentation property. */
1821 while (SYMBOLP (fun
))
1823 Lisp_Object tmp
= Fget (fun
, Qinteractive_form
);
1826 fun
= Fsymbol_function (fun
);
1829 /* Emacs primitives are interactive if their DEFUN specifies an
1830 interactive spec. */
1832 return XSUBR (fun
)->intspec
? Qt
: if_prop
;
1834 /* Bytecode objects are interactive if they are long enough to
1835 have an element whose index is COMPILED_INTERACTIVE, which is
1836 where the interactive spec is stored. */
1837 else if (COMPILEDP (fun
))
1838 return ((ASIZE (fun
) & PSEUDOVECTOR_SIZE_MASK
) > COMPILED_INTERACTIVE
1841 /* Strings and vectors are keyboard macros. */
1842 if (STRINGP (fun
) || VECTORP (fun
))
1843 return (NILP (for_call_interactively
) ? Qt
: Qnil
);
1845 /* Lists may represent commands. */
1848 funcar
= XCAR (fun
);
1849 if (EQ (funcar
, Qclosure
))
1850 return (!NILP (Fassq (Qinteractive
, Fcdr (Fcdr (XCDR (fun
)))))
1852 else if (EQ (funcar
, Qlambda
))
1853 return !NILP (Fassq (Qinteractive
, Fcdr (XCDR (fun
)))) ? Qt
: if_prop
;
1854 else if (EQ (funcar
, Qautoload
))
1855 return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun
))))) ? Qt
: if_prop
;
1860 DEFUN ("autoload", Fautoload
, Sautoload
, 2, 5, 0,
1861 doc
: /* Define FUNCTION to autoload from FILE.
1862 FUNCTION is a symbol; FILE is a file name string to pass to `load'.
1863 Third arg DOCSTRING is documentation for the function.
1864 Fourth arg INTERACTIVE if non-nil says function can be called interactively.
1865 Fifth arg TYPE indicates the type of the object:
1866 nil or omitted says FUNCTION is a function,
1867 `keymap' says FUNCTION is really a keymap, and
1868 `macro' or t says FUNCTION is really a macro.
1869 Third through fifth args give info about the real definition.
1870 They default to nil.
1871 If FUNCTION is already defined other than as an autoload,
1872 this does nothing and returns nil. */)
1873 (Lisp_Object function
, Lisp_Object file
, Lisp_Object docstring
, Lisp_Object interactive
, Lisp_Object type
)
1875 CHECK_SYMBOL (function
);
1876 CHECK_STRING (file
);
1878 /* If function is defined and not as an autoload, don't override. */
1879 if (!NILP (XSYMBOL (function
)->function
)
1880 && !AUTOLOADP (XSYMBOL (function
)->function
))
1883 if (!NILP (Vpurify_flag
) && EQ (docstring
, make_number (0)))
1884 /* `read1' in lread.c has found the docstring starting with "\
1885 and assumed the docstring will be provided by Snarf-documentation, so it
1886 passed us 0 instead. But that leads to accidental sharing in purecopy's
1887 hash-consing, so we use a (hopefully) unique integer instead. */
1888 docstring
= make_number (XHASH (function
));
1889 return Fdefalias (function
,
1890 list5 (Qautoload
, file
, docstring
, interactive
, type
),
1895 un_autoload (Lisp_Object oldqueue
)
1897 Lisp_Object queue
, first
, second
;
1899 /* Queue to unwind is current value of Vautoload_queue.
1900 oldqueue is the shadowed value to leave in Vautoload_queue. */
1901 queue
= Vautoload_queue
;
1902 Vautoload_queue
= oldqueue
;
1903 while (CONSP (queue
))
1905 first
= XCAR (queue
);
1906 second
= Fcdr (first
);
1907 first
= Fcar (first
);
1908 if (EQ (first
, make_number (0)))
1911 Ffset (first
, second
);
1912 queue
= XCDR (queue
);
1916 /* Load an autoloaded function.
1917 FUNNAME is the symbol which is the function's name.
1918 FUNDEF is the autoload definition (a list). */
1920 DEFUN ("autoload-do-load", Fautoload_do_load
, Sautoload_do_load
, 1, 3, 0,
1921 doc
: /* Load FUNDEF which should be an autoload.
1922 If non-nil, FUNNAME should be the symbol whose function value is FUNDEF,
1923 in which case the function returns the new autoloaded function value.
1924 If equal to `macro', MACRO-ONLY specifies that FUNDEF should only be loaded if
1925 it is defines a macro. */)
1926 (Lisp_Object fundef
, Lisp_Object funname
, Lisp_Object macro_only
)
1928 ptrdiff_t count
= SPECPDL_INDEX ();
1929 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1931 if (!CONSP (fundef
) || !EQ (Qautoload
, XCAR (fundef
)))
1934 if (EQ (macro_only
, Qmacro
))
1936 Lisp_Object kind
= Fnth (make_number (4), fundef
);
1937 if (! (EQ (kind
, Qt
) || EQ (kind
, Qmacro
)))
1941 /* This is to make sure that loadup.el gives a clear picture
1942 of what files are preloaded and when. */
1943 if (! NILP (Vpurify_flag
))
1944 error ("Attempt to autoload %s while preparing to dump",
1945 SDATA (SYMBOL_NAME (funname
)));
1947 CHECK_SYMBOL (funname
);
1948 GCPRO3 (funname
, fundef
, macro_only
);
1950 /* Preserve the match data. */
1951 record_unwind_save_match_data ();
1953 /* If autoloading gets an error (which includes the error of failing
1954 to define the function being called), we use Vautoload_queue
1955 to undo function definitions and `provide' calls made by
1956 the function. We do this in the specific case of autoloading
1957 because autoloading is not an explicit request "load this file",
1958 but rather a request to "call this function".
1960 The value saved here is to be restored into Vautoload_queue. */
1961 record_unwind_protect (un_autoload
, Vautoload_queue
);
1962 Vautoload_queue
= Qt
;
1963 /* If `macro_only', assume this autoload to be a "best-effort",
1964 so don't signal an error if autoloading fails. */
1965 Fload (Fcar (Fcdr (fundef
)), macro_only
, Qt
, Qnil
, Qt
);
1967 /* Once loading finishes, don't undo it. */
1968 Vautoload_queue
= Qt
;
1969 unbind_to (count
, Qnil
);
1977 Lisp_Object fun
= Findirect_function (funname
, Qnil
);
1979 if (!NILP (Fequal (fun
, fundef
)))
1980 error ("Autoloading failed to define function %s",
1981 SDATA (SYMBOL_NAME (funname
)));
1988 DEFUN ("eval", Feval
, Seval
, 1, 2, 0,
1989 doc
: /* Evaluate FORM and return its value.
1990 If LEXICAL is t, evaluate using lexical scoping.
1991 LEXICAL can also be an actual lexical environment, in the form of an
1992 alist mapping symbols to their value. */)
1993 (Lisp_Object form
, Lisp_Object lexical
)
1995 ptrdiff_t count
= SPECPDL_INDEX ();
1996 specbind (Qinternal_interpreter_environment
,
1997 CONSP (lexical
) || NILP (lexical
) ? lexical
: list1 (Qt
));
1998 return unbind_to (count
, eval_sub (form
));
2001 /* Grow the specpdl stack by one entry.
2002 The caller should have already initialized the entry.
2003 Signal an error on stack overflow.
2005 Make sure that there is always one unused entry past the top of the
2006 stack, so that the just-initialized entry is safely unwound if
2007 memory exhausted and an error is signaled here. Also, allocate a
2008 never-used entry just before the bottom of the stack; sometimes its
2009 address is taken. */
2016 if (specpdl_ptr
== specpdl
+ specpdl_size
)
2018 ptrdiff_t count
= SPECPDL_INDEX ();
2019 ptrdiff_t max_size
= min (max_specpdl_size
, PTRDIFF_MAX
- 1000);
2020 union specbinding
*pdlvec
= specpdl
- 1;
2021 ptrdiff_t pdlvecsize
= specpdl_size
+ 1;
2022 if (max_size
<= specpdl_size
)
2024 if (max_specpdl_size
< 400)
2025 max_size
= max_specpdl_size
= 400;
2026 if (max_size
<= specpdl_size
)
2027 signal_error ("Variable binding depth exceeds max-specpdl-size",
2030 pdlvec
= xpalloc (pdlvec
, &pdlvecsize
, 1, max_size
+ 1, sizeof *specpdl
);
2031 specpdl
= pdlvec
+ 1;
2032 specpdl_size
= pdlvecsize
- 1;
2033 specpdl_ptr
= specpdl
+ count
;
2038 record_in_backtrace (Lisp_Object function
, Lisp_Object
*args
, ptrdiff_t nargs
)
2040 eassert (nargs
>= UNEVALLED
);
2041 specpdl_ptr
->bt
.kind
= SPECPDL_BACKTRACE
;
2042 specpdl_ptr
->bt
.debug_on_exit
= false;
2043 specpdl_ptr
->bt
.function
= function
;
2044 specpdl_ptr
->bt
.args
= args
;
2045 specpdl_ptr
->bt
.nargs
= nargs
;
2049 /* Eval a sub-expression of the current expression (i.e. in the same
2052 eval_sub (Lisp_Object form
)
2054 Lisp_Object fun
, val
, original_fun
, original_args
;
2056 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2060 /* Look up its binding in the lexical environment.
2061 We do not pay attention to the declared_special flag here, since we
2062 already did that when let-binding the variable. */
2063 Lisp_Object lex_binding
2064 = !NILP (Vinternal_interpreter_environment
) /* Mere optimization! */
2065 ? Fassq (form
, Vinternal_interpreter_environment
)
2067 if (CONSP (lex_binding
))
2068 return XCDR (lex_binding
);
2070 return Fsymbol_value (form
);
2082 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2084 if (max_lisp_eval_depth
< 100)
2085 max_lisp_eval_depth
= 100;
2086 if (lisp_eval_depth
> max_lisp_eval_depth
)
2087 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2090 original_fun
= XCAR (form
);
2091 original_args
= XCDR (form
);
2093 /* This also protects them from gc. */
2094 record_in_backtrace (original_fun
, &original_args
, UNEVALLED
);
2096 if (debug_on_next_call
)
2097 do_debug_on_call (Qt
);
2099 /* At this point, only original_fun and original_args
2100 have values that will be used below. */
2103 /* Optimize for no indirection. */
2106 fun
= Ffunction (Fcons (fun
, Qnil
));
2107 else if (!NILP (fun
) && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2108 fun
= indirect_function (fun
);
2112 Lisp_Object numargs
;
2113 Lisp_Object argvals
[8];
2114 Lisp_Object args_left
;
2115 register int i
, maxargs
;
2117 args_left
= original_args
;
2118 numargs
= Flength (args_left
);
2122 if (XINT (numargs
) < XSUBR (fun
)->min_args
2123 || (XSUBR (fun
)->max_args
>= 0
2124 && XSUBR (fun
)->max_args
< XINT (numargs
)))
2125 xsignal2 (Qwrong_number_of_arguments
, original_fun
, numargs
);
2127 else if (XSUBR (fun
)->max_args
== UNEVALLED
)
2128 val
= (XSUBR (fun
)->function
.aUNEVALLED
) (args_left
);
2129 else if (XSUBR (fun
)->max_args
== MANY
)
2131 /* Pass a vector of evaluated arguments. */
2133 ptrdiff_t argnum
= 0;
2136 SAFE_ALLOCA_LISP (vals
, XINT (numargs
));
2138 GCPRO3 (args_left
, fun
, fun
);
2142 while (!NILP (args_left
))
2144 vals
[argnum
++] = eval_sub (Fcar (args_left
));
2145 args_left
= Fcdr (args_left
);
2146 gcpro3
.nvars
= argnum
;
2149 set_backtrace_args (specpdl_ptr
- 1, vals
);
2150 set_backtrace_nargs (specpdl_ptr
- 1, XINT (numargs
));
2152 val
= (XSUBR (fun
)->function
.aMANY
) (XINT (numargs
), vals
);
2158 GCPRO3 (args_left
, fun
, fun
);
2159 gcpro3
.var
= argvals
;
2162 maxargs
= XSUBR (fun
)->max_args
;
2163 for (i
= 0; i
< maxargs
; args_left
= Fcdr (args_left
))
2165 argvals
[i
] = eval_sub (Fcar (args_left
));
2171 set_backtrace_args (specpdl_ptr
- 1, argvals
);
2172 set_backtrace_nargs (specpdl_ptr
- 1, XINT (numargs
));
2177 val
= (XSUBR (fun
)->function
.a0 ());
2180 val
= (XSUBR (fun
)->function
.a1 (argvals
[0]));
2183 val
= (XSUBR (fun
)->function
.a2 (argvals
[0], argvals
[1]));
2186 val
= (XSUBR (fun
)->function
.a3
2187 (argvals
[0], argvals
[1], argvals
[2]));
2190 val
= (XSUBR (fun
)->function
.a4
2191 (argvals
[0], argvals
[1], argvals
[2], argvals
[3]));
2194 val
= (XSUBR (fun
)->function
.a5
2195 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2199 val
= (XSUBR (fun
)->function
.a6
2200 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2201 argvals
[4], argvals
[5]));
2204 val
= (XSUBR (fun
)->function
.a7
2205 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2206 argvals
[4], argvals
[5], argvals
[6]));
2210 val
= (XSUBR (fun
)->function
.a8
2211 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2212 argvals
[4], argvals
[5], argvals
[6], argvals
[7]));
2216 /* Someone has created a subr that takes more arguments than
2217 is supported by this code. We need to either rewrite the
2218 subr to use a different argument protocol, or add more
2219 cases to this switch. */
2224 else if (COMPILEDP (fun
))
2225 val
= apply_lambda (fun
, original_args
);
2229 xsignal1 (Qvoid_function
, original_fun
);
2231 xsignal1 (Qinvalid_function
, original_fun
);
2232 funcar
= XCAR (fun
);
2233 if (!SYMBOLP (funcar
))
2234 xsignal1 (Qinvalid_function
, original_fun
);
2235 if (EQ (funcar
, Qautoload
))
2237 Fautoload_do_load (fun
, original_fun
, Qnil
);
2240 if (EQ (funcar
, Qmacro
))
2242 ptrdiff_t count
= SPECPDL_INDEX ();
2244 /* Bind lexical-binding during expansion of the macro, so the
2245 macro can know reliably if the code it outputs will be
2246 interpreted using lexical-binding or not. */
2247 specbind (Qlexical_binding
,
2248 NILP (Vinternal_interpreter_environment
) ? Qnil
: Qt
);
2249 exp
= apply1 (Fcdr (fun
), original_args
);
2250 unbind_to (count
, Qnil
);
2251 val
= eval_sub (exp
);
2253 else if (EQ (funcar
, Qlambda
)
2254 || EQ (funcar
, Qclosure
))
2255 val
= apply_lambda (fun
, original_args
);
2257 xsignal1 (Qinvalid_function
, original_fun
);
2262 if (backtrace_debug_on_exit (specpdl_ptr
- 1))
2263 val
= call_debugger (list2 (Qexit
, val
));
2269 DEFUN ("apply", Fapply
, Sapply
, 1, MANY
, 0,
2270 doc
: /* Call FUNCTION with our remaining args, using our last arg as list of args.
2271 Then return the value FUNCTION returns.
2272 Thus, (apply '+ 1 2 '(3 4)) returns 10.
2273 usage: (apply FUNCTION &rest ARGUMENTS) */)
2274 (ptrdiff_t nargs
, Lisp_Object
*args
)
2278 register Lisp_Object spread_arg
;
2279 register Lisp_Object
*funcall_args
;
2280 Lisp_Object fun
, retval
;
2281 struct gcpro gcpro1
;
2286 spread_arg
= args
[nargs
- 1];
2287 CHECK_LIST (spread_arg
);
2289 numargs
= XINT (Flength (spread_arg
));
2292 return Ffuncall (nargs
- 1, args
);
2293 else if (numargs
== 1)
2295 args
[nargs
- 1] = XCAR (spread_arg
);
2296 return Ffuncall (nargs
, args
);
2299 numargs
+= nargs
- 2;
2301 /* Optimize for no indirection. */
2302 if (SYMBOLP (fun
) && !NILP (fun
)
2303 && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2304 fun
= indirect_function (fun
);
2307 /* Let funcall get the error. */
2314 if (numargs
< XSUBR (fun
)->min_args
2315 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2316 goto funcall
; /* Let funcall get the error. */
2317 else if (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
> numargs
)
2319 /* Avoid making funcall cons up a yet another new vector of arguments
2320 by explicitly supplying nil's for optional values. */
2321 SAFE_ALLOCA_LISP (funcall_args
, 1 + XSUBR (fun
)->max_args
);
2322 for (i
= numargs
; i
< XSUBR (fun
)->max_args
;)
2323 funcall_args
[++i
] = Qnil
;
2324 GCPRO1 (*funcall_args
);
2325 gcpro1
.nvars
= 1 + XSUBR (fun
)->max_args
;
2329 /* We add 1 to numargs because funcall_args includes the
2330 function itself as well as its arguments. */
2333 SAFE_ALLOCA_LISP (funcall_args
, 1 + numargs
);
2334 GCPRO1 (*funcall_args
);
2335 gcpro1
.nvars
= 1 + numargs
;
2338 memcpy (funcall_args
, args
, nargs
* word_size
);
2339 /* Spread the last arg we got. Its first element goes in
2340 the slot that it used to occupy, hence this value of I. */
2342 while (!NILP (spread_arg
))
2344 funcall_args
[i
++] = XCAR (spread_arg
);
2345 spread_arg
= XCDR (spread_arg
);
2348 /* By convention, the caller needs to gcpro Ffuncall's args. */
2349 retval
= Ffuncall (gcpro1
.nvars
, funcall_args
);
2356 /* Run hook variables in various ways. */
2359 funcall_nil (ptrdiff_t nargs
, Lisp_Object
*args
)
2361 Ffuncall (nargs
, args
);
2365 DEFUN ("run-hooks", Frun_hooks
, Srun_hooks
, 0, MANY
, 0,
2366 doc
: /* Run each hook in HOOKS.
2367 Each argument should be a symbol, a hook variable.
2368 These symbols are processed in the order specified.
2369 If a hook symbol has a non-nil value, that value may be a function
2370 or a list of functions to be called to run the hook.
2371 If the value is a function, it is called with no arguments.
2372 If it is a list, the elements are called, in order, with no arguments.
2374 Major modes should not use this function directly to run their mode
2375 hook; they should use `run-mode-hooks' instead.
2377 Do not use `make-local-variable' to make a hook variable buffer-local.
2378 Instead, use `add-hook' and specify t for the LOCAL argument.
2379 usage: (run-hooks &rest HOOKS) */)
2380 (ptrdiff_t nargs
, Lisp_Object
*args
)
2382 Lisp_Object hook
[1];
2385 for (i
= 0; i
< nargs
; i
++)
2388 run_hook_with_args (1, hook
, funcall_nil
);
2394 DEFUN ("run-hook-with-args", Frun_hook_with_args
,
2395 Srun_hook_with_args
, 1, MANY
, 0,
2396 doc
: /* Run HOOK with the specified arguments ARGS.
2397 HOOK should be a symbol, a hook variable. The value of HOOK
2398 may be nil, a function, or a list of functions. Call each
2399 function in order with arguments ARGS. The final return value
2402 Do not use `make-local-variable' to make a hook variable buffer-local.
2403 Instead, use `add-hook' and specify t for the LOCAL argument.
2404 usage: (run-hook-with-args HOOK &rest ARGS) */)
2405 (ptrdiff_t nargs
, Lisp_Object
*args
)
2407 return run_hook_with_args (nargs
, args
, funcall_nil
);
2410 /* NB this one still documents a specific non-nil return value.
2411 (As did run-hook-with-args and run-hook-with-args-until-failure
2412 until they were changed in 24.1.) */
2413 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success
,
2414 Srun_hook_with_args_until_success
, 1, MANY
, 0,
2415 doc
: /* Run HOOK with the specified arguments ARGS.
2416 HOOK should be a symbol, a hook variable. The value of HOOK
2417 may be nil, a function, or a list of functions. Call each
2418 function in order with arguments ARGS, stopping at the first
2419 one that returns non-nil, and return that value. Otherwise (if
2420 all functions return nil, or if there are no functions to call),
2423 Do not use `make-local-variable' to make a hook variable buffer-local.
2424 Instead, use `add-hook' and specify t for the LOCAL argument.
2425 usage: (run-hook-with-args-until-success HOOK &rest ARGS) */)
2426 (ptrdiff_t nargs
, Lisp_Object
*args
)
2428 return run_hook_with_args (nargs
, args
, Ffuncall
);
2432 funcall_not (ptrdiff_t nargs
, Lisp_Object
*args
)
2434 return NILP (Ffuncall (nargs
, args
)) ? Qt
: Qnil
;
2437 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure
,
2438 Srun_hook_with_args_until_failure
, 1, MANY
, 0,
2439 doc
: /* Run HOOK with the specified arguments ARGS.
2440 HOOK should be a symbol, a hook variable. The value of HOOK
2441 may be nil, a function, or a list of functions. Call each
2442 function in order with arguments ARGS, stopping at the first
2443 one that returns nil, and return nil. Otherwise (if all functions
2444 return non-nil, or if there are no functions to call), return non-nil
2445 \(do not rely on the precise return value in this case).
2447 Do not use `make-local-variable' to make a hook variable buffer-local.
2448 Instead, use `add-hook' and specify t for the LOCAL argument.
2449 usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */)
2450 (ptrdiff_t nargs
, Lisp_Object
*args
)
2452 return NILP (run_hook_with_args (nargs
, args
, funcall_not
)) ? Qt
: Qnil
;
2456 run_hook_wrapped_funcall (ptrdiff_t nargs
, Lisp_Object
*args
)
2458 Lisp_Object tmp
= args
[0], ret
;
2461 ret
= Ffuncall (nargs
, args
);
2467 DEFUN ("run-hook-wrapped", Frun_hook_wrapped
, Srun_hook_wrapped
, 2, MANY
, 0,
2468 doc
: /* Run HOOK, passing each function through WRAP-FUNCTION.
2469 I.e. instead of calling each function FUN directly with arguments ARGS,
2470 it calls WRAP-FUNCTION with arguments FUN and ARGS.
2471 As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped'
2472 aborts and returns that value.
2473 usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */)
2474 (ptrdiff_t nargs
, Lisp_Object
*args
)
2476 return run_hook_with_args (nargs
, args
, run_hook_wrapped_funcall
);
2479 /* ARGS[0] should be a hook symbol.
2480 Call each of the functions in the hook value, passing each of them
2481 as arguments all the rest of ARGS (all NARGS - 1 elements).
2482 FUNCALL specifies how to call each function on the hook.
2483 The caller (or its caller, etc) must gcpro all of ARGS,
2484 except that it isn't necessary to gcpro ARGS[0]. */
2487 run_hook_with_args (ptrdiff_t nargs
, Lisp_Object
*args
,
2488 Lisp_Object (*funcall
) (ptrdiff_t nargs
, Lisp_Object
*args
))
2490 Lisp_Object sym
, val
, ret
= Qnil
;
2491 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2493 /* If we are dying or still initializing,
2494 don't do anything--it would probably crash if we tried. */
2495 if (NILP (Vrun_hooks
))
2499 val
= find_symbol_value (sym
);
2501 if (EQ (val
, Qunbound
) || NILP (val
))
2503 else if (!CONSP (val
) || FUNCTIONP (val
))
2506 return funcall (nargs
, args
);
2510 Lisp_Object global_vals
= Qnil
;
2511 GCPRO3 (sym
, val
, global_vals
);
2514 CONSP (val
) && NILP (ret
);
2517 if (EQ (XCAR (val
), Qt
))
2519 /* t indicates this hook has a local binding;
2520 it means to run the global binding too. */
2521 global_vals
= Fdefault_value (sym
);
2522 if (NILP (global_vals
)) continue;
2524 if (!CONSP (global_vals
) || EQ (XCAR (global_vals
), Qlambda
))
2526 args
[0] = global_vals
;
2527 ret
= funcall (nargs
, args
);
2532 CONSP (global_vals
) && NILP (ret
);
2533 global_vals
= XCDR (global_vals
))
2535 args
[0] = XCAR (global_vals
);
2536 /* In a global value, t should not occur. If it does, we
2537 must ignore it to avoid an endless loop. */
2538 if (!EQ (args
[0], Qt
))
2539 ret
= funcall (nargs
, args
);
2545 args
[0] = XCAR (val
);
2546 ret
= funcall (nargs
, args
);
2555 /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
2558 run_hook_with_args_2 (Lisp_Object hook
, Lisp_Object arg1
, Lisp_Object arg2
)
2560 Lisp_Object temp
[3];
2565 Frun_hook_with_args (3, temp
);
2568 /* Apply fn to arg. */
2570 apply1 (Lisp_Object fn
, Lisp_Object arg
)
2572 struct gcpro gcpro1
;
2576 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2579 Lisp_Object args
[2];
2583 RETURN_UNGCPRO (Fapply (2, args
));
2587 /* Call function fn on no arguments. */
2589 call0 (Lisp_Object fn
)
2591 struct gcpro gcpro1
;
2594 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2597 /* Call function fn with 1 argument arg1. */
2600 call1 (Lisp_Object fn
, Lisp_Object arg1
)
2602 struct gcpro gcpro1
;
2603 Lisp_Object args
[2];
2609 RETURN_UNGCPRO (Ffuncall (2, args
));
2612 /* Call function fn with 2 arguments arg1, arg2. */
2615 call2 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
)
2617 struct gcpro gcpro1
;
2618 Lisp_Object args
[3];
2624 RETURN_UNGCPRO (Ffuncall (3, args
));
2627 /* Call function fn with 3 arguments arg1, arg2, arg3. */
2630 call3 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
)
2632 struct gcpro gcpro1
;
2633 Lisp_Object args
[4];
2640 RETURN_UNGCPRO (Ffuncall (4, args
));
2643 /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */
2646 call4 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2649 struct gcpro gcpro1
;
2650 Lisp_Object args
[5];
2658 RETURN_UNGCPRO (Ffuncall (5, args
));
2661 /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */
2664 call5 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2665 Lisp_Object arg4
, Lisp_Object arg5
)
2667 struct gcpro gcpro1
;
2668 Lisp_Object args
[6];
2677 RETURN_UNGCPRO (Ffuncall (6, args
));
2680 /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */
2683 call6 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2684 Lisp_Object arg4
, Lisp_Object arg5
, Lisp_Object arg6
)
2686 struct gcpro gcpro1
;
2687 Lisp_Object args
[7];
2697 RETURN_UNGCPRO (Ffuncall (7, args
));
2700 /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */
2703 call7 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2704 Lisp_Object arg4
, Lisp_Object arg5
, Lisp_Object arg6
, Lisp_Object arg7
)
2706 struct gcpro gcpro1
;
2707 Lisp_Object args
[8];
2718 RETURN_UNGCPRO (Ffuncall (8, args
));
2721 /* The caller should GCPRO all the elements of ARGS. */
2723 DEFUN ("functionp", Ffunctionp
, Sfunctionp
, 1, 1, 0,
2724 doc
: /* Non-nil if OBJECT is a function. */)
2725 (Lisp_Object object
)
2727 if (FUNCTIONP (object
))
2732 DEFUN ("funcall", Ffuncall
, Sfuncall
, 1, MANY
, 0,
2733 doc
: /* Call first argument as a function, passing remaining arguments to it.
2734 Return the value that function returns.
2735 Thus, (funcall 'cons 'x 'y) returns (x . y).
2736 usage: (funcall FUNCTION &rest ARGUMENTS) */)
2737 (ptrdiff_t nargs
, Lisp_Object
*args
)
2739 Lisp_Object fun
, original_fun
;
2741 ptrdiff_t numargs
= nargs
- 1;
2742 Lisp_Object lisp_numargs
;
2744 register Lisp_Object
*internal_args
;
2749 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2751 if (max_lisp_eval_depth
< 100)
2752 max_lisp_eval_depth
= 100;
2753 if (lisp_eval_depth
> max_lisp_eval_depth
)
2754 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2757 /* This also GCPROs them. */
2758 record_in_backtrace (args
[0], &args
[1], nargs
- 1);
2760 /* Call GC after setting up the backtrace, so the latter GCPROs the args. */
2763 if (debug_on_next_call
)
2764 do_debug_on_call (Qlambda
);
2768 original_fun
= args
[0];
2772 /* Optimize for no indirection. */
2774 if (SYMBOLP (fun
) && !NILP (fun
)
2775 && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2776 fun
= indirect_function (fun
);
2780 if (numargs
< XSUBR (fun
)->min_args
2781 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2783 XSETFASTINT (lisp_numargs
, numargs
);
2784 xsignal2 (Qwrong_number_of_arguments
, original_fun
, lisp_numargs
);
2787 else if (XSUBR (fun
)->max_args
== UNEVALLED
)
2788 xsignal1 (Qinvalid_function
, original_fun
);
2790 else if (XSUBR (fun
)->max_args
== MANY
)
2791 val
= (XSUBR (fun
)->function
.aMANY
) (numargs
, args
+ 1);
2794 if (XSUBR (fun
)->max_args
> numargs
)
2796 internal_args
= alloca (XSUBR (fun
)->max_args
2797 * sizeof *internal_args
);
2798 memcpy (internal_args
, args
+ 1, numargs
* word_size
);
2799 for (i
= numargs
; i
< XSUBR (fun
)->max_args
; i
++)
2800 internal_args
[i
] = Qnil
;
2803 internal_args
= args
+ 1;
2804 switch (XSUBR (fun
)->max_args
)
2807 val
= (XSUBR (fun
)->function
.a0 ());
2810 val
= (XSUBR (fun
)->function
.a1 (internal_args
[0]));
2813 val
= (XSUBR (fun
)->function
.a2
2814 (internal_args
[0], internal_args
[1]));
2817 val
= (XSUBR (fun
)->function
.a3
2818 (internal_args
[0], internal_args
[1], internal_args
[2]));
2821 val
= (XSUBR (fun
)->function
.a4
2822 (internal_args
[0], internal_args
[1], internal_args
[2],
2826 val
= (XSUBR (fun
)->function
.a5
2827 (internal_args
[0], internal_args
[1], internal_args
[2],
2828 internal_args
[3], internal_args
[4]));
2831 val
= (XSUBR (fun
)->function
.a6
2832 (internal_args
[0], internal_args
[1], internal_args
[2],
2833 internal_args
[3], internal_args
[4], internal_args
[5]));
2836 val
= (XSUBR (fun
)->function
.a7
2837 (internal_args
[0], internal_args
[1], internal_args
[2],
2838 internal_args
[3], internal_args
[4], internal_args
[5],
2843 val
= (XSUBR (fun
)->function
.a8
2844 (internal_args
[0], internal_args
[1], internal_args
[2],
2845 internal_args
[3], internal_args
[4], internal_args
[5],
2846 internal_args
[6], internal_args
[7]));
2851 /* If a subr takes more than 8 arguments without using MANY
2852 or UNEVALLED, we need to extend this function to support it.
2853 Until this is done, there is no way to call the function. */
2858 else if (COMPILEDP (fun
))
2859 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2863 xsignal1 (Qvoid_function
, original_fun
);
2865 xsignal1 (Qinvalid_function
, original_fun
);
2866 funcar
= XCAR (fun
);
2867 if (!SYMBOLP (funcar
))
2868 xsignal1 (Qinvalid_function
, original_fun
);
2869 if (EQ (funcar
, Qlambda
)
2870 || EQ (funcar
, Qclosure
))
2871 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2872 else if (EQ (funcar
, Qautoload
))
2874 Fautoload_do_load (fun
, original_fun
, Qnil
);
2879 xsignal1 (Qinvalid_function
, original_fun
);
2883 if (backtrace_debug_on_exit (specpdl_ptr
- 1))
2884 val
= call_debugger (list2 (Qexit
, val
));
2890 apply_lambda (Lisp_Object fun
, Lisp_Object args
)
2892 Lisp_Object args_left
;
2895 register Lisp_Object
*arg_vector
;
2896 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2897 register Lisp_Object tem
;
2900 numargs
= XFASTINT (Flength (args
));
2901 SAFE_ALLOCA_LISP (arg_vector
, numargs
);
2904 GCPRO3 (*arg_vector
, args_left
, fun
);
2907 for (i
= 0; i
< numargs
; )
2909 tem
= Fcar (args_left
), args_left
= Fcdr (args_left
);
2910 tem
= eval_sub (tem
);
2911 arg_vector
[i
++] = tem
;
2917 set_backtrace_args (specpdl_ptr
- 1, arg_vector
);
2918 set_backtrace_nargs (specpdl_ptr
- 1, i
);
2919 tem
= funcall_lambda (fun
, numargs
, arg_vector
);
2921 /* Do the debug-on-exit now, while arg_vector still exists. */
2922 if (backtrace_debug_on_exit (specpdl_ptr
- 1))
2924 /* Don't do it again when we return to eval. */
2925 set_backtrace_debug_on_exit (specpdl_ptr
- 1, false);
2926 tem
= call_debugger (list2 (Qexit
, tem
));
2932 /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
2933 and return the result of evaluation.
2934 FUN must be either a lambda-expression or a compiled-code object. */
2937 funcall_lambda (Lisp_Object fun
, ptrdiff_t nargs
,
2938 register Lisp_Object
*arg_vector
)
2940 Lisp_Object val
, syms_left
, next
, lexenv
;
2941 ptrdiff_t count
= SPECPDL_INDEX ();
2943 bool optional
, rest
;
2947 if (EQ (XCAR (fun
), Qclosure
))
2949 fun
= XCDR (fun
); /* Drop `closure'. */
2950 lexenv
= XCAR (fun
);
2951 CHECK_LIST_CONS (fun
, fun
);
2955 syms_left
= XCDR (fun
);
2956 if (CONSP (syms_left
))
2957 syms_left
= XCAR (syms_left
);
2959 xsignal1 (Qinvalid_function
, fun
);
2961 else if (COMPILEDP (fun
))
2963 syms_left
= AREF (fun
, COMPILED_ARGLIST
);
2964 if (INTEGERP (syms_left
))
2965 /* A byte-code object with a non-nil `push args' slot means we
2966 shouldn't bind any arguments, instead just call the byte-code
2967 interpreter directly; it will push arguments as necessary.
2969 Byte-code objects with either a non-existent, or a nil value for
2970 the `push args' slot (the default), have dynamically-bound
2971 arguments, and use the argument-binding code below instead (as do
2972 all interpreted functions, even lexically bound ones). */
2974 /* If we have not actually read the bytecode string
2975 and constants vector yet, fetch them from the file. */
2976 if (CONSP (AREF (fun
, COMPILED_BYTECODE
)))
2977 Ffetch_bytecode (fun
);
2978 return exec_byte_code (AREF (fun
, COMPILED_BYTECODE
),
2979 AREF (fun
, COMPILED_CONSTANTS
),
2980 AREF (fun
, COMPILED_STACK_DEPTH
),
2989 i
= optional
= rest
= 0;
2990 for (; CONSP (syms_left
); syms_left
= XCDR (syms_left
))
2994 next
= XCAR (syms_left
);
2995 if (!SYMBOLP (next
))
2996 xsignal1 (Qinvalid_function
, fun
);
2998 if (EQ (next
, Qand_rest
))
3000 else if (EQ (next
, Qand_optional
))
3007 arg
= Flist (nargs
- i
, &arg_vector
[i
]);
3011 arg
= arg_vector
[i
++];
3013 xsignal2 (Qwrong_number_of_arguments
, fun
, make_number (nargs
));
3017 /* Bind the argument. */
3018 if (!NILP (lexenv
) && SYMBOLP (next
))
3019 /* Lexically bind NEXT by adding it to the lexenv alist. */
3020 lexenv
= Fcons (Fcons (next
, arg
), lexenv
);
3022 /* Dynamically bind NEXT. */
3023 specbind (next
, arg
);
3027 if (!NILP (syms_left
))
3028 xsignal1 (Qinvalid_function
, fun
);
3030 xsignal2 (Qwrong_number_of_arguments
, fun
, make_number (nargs
));
3032 if (!EQ (lexenv
, Vinternal_interpreter_environment
))
3033 /* Instantiate a new lexical environment. */
3034 specbind (Qinternal_interpreter_environment
, lexenv
);
3037 val
= Fprogn (XCDR (XCDR (fun
)));
3040 /* If we have not actually read the bytecode string
3041 and constants vector yet, fetch them from the file. */
3042 if (CONSP (AREF (fun
, COMPILED_BYTECODE
)))
3043 Ffetch_bytecode (fun
);
3044 val
= exec_byte_code (AREF (fun
, COMPILED_BYTECODE
),
3045 AREF (fun
, COMPILED_CONSTANTS
),
3046 AREF (fun
, COMPILED_STACK_DEPTH
),
3050 return unbind_to (count
, val
);
3053 DEFUN ("fetch-bytecode", Ffetch_bytecode
, Sfetch_bytecode
,
3055 doc
: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */)
3056 (Lisp_Object object
)
3060 if (COMPILEDP (object
) && CONSP (AREF (object
, COMPILED_BYTECODE
)))
3062 tem
= read_doc_string (AREF (object
, COMPILED_BYTECODE
));
3065 tem
= AREF (object
, COMPILED_BYTECODE
);
3066 if (CONSP (tem
) && STRINGP (XCAR (tem
)))
3067 error ("Invalid byte code in %s", SDATA (XCAR (tem
)));
3069 error ("Invalid byte code");
3071 ASET (object
, COMPILED_BYTECODE
, XCAR (tem
));
3072 ASET (object
, COMPILED_CONSTANTS
, XCDR (tem
));
3077 /* Return true if SYMBOL currently has a let-binding
3078 which was made in the buffer that is now current. */
3081 let_shadows_buffer_binding_p (struct Lisp_Symbol
*symbol
)
3083 union specbinding
*p
;
3084 Lisp_Object buf
= Fcurrent_buffer ();
3086 for (p
= specpdl_ptr
; p
> specpdl
; )
3087 if ((--p
)->kind
> SPECPDL_LET
)
3089 struct Lisp_Symbol
*let_bound_symbol
= XSYMBOL (specpdl_symbol (p
));
3090 eassert (let_bound_symbol
->redirect
!= SYMBOL_VARALIAS
);
3091 if (symbol
== let_bound_symbol
3092 && EQ (specpdl_where (p
), buf
))
3100 let_shadows_global_binding_p (Lisp_Object symbol
)
3102 union specbinding
*p
;
3104 for (p
= specpdl_ptr
; p
> specpdl
; )
3105 if ((--p
)->kind
>= SPECPDL_LET
&& EQ (specpdl_symbol (p
), symbol
))
3111 /* `specpdl_ptr' describes which variable is
3112 let-bound, so it can be properly undone when we unbind_to.
3113 It can be either a plain SPECPDL_LET or a SPECPDL_LET_LOCAL/DEFAULT.
3114 - SYMBOL is the variable being bound. Note that it should not be
3115 aliased (i.e. when let-binding V1 that's aliased to V2, we want
3117 - WHERE tells us in which buffer the binding took place.
3118 This is used for SPECPDL_LET_LOCAL bindings (i.e. bindings to a
3119 buffer-local variable) as well as for SPECPDL_LET_DEFAULT bindings,
3120 i.e. bindings to the default value of a variable which can be
3124 specbind (Lisp_Object symbol
, Lisp_Object value
)
3126 struct Lisp_Symbol
*sym
;
3128 CHECK_SYMBOL (symbol
);
3129 sym
= XSYMBOL (symbol
);
3132 switch (sym
->redirect
)
3134 case SYMBOL_VARALIAS
:
3135 sym
= indirect_variable (sym
); XSETSYMBOL (symbol
, sym
); goto start
;
3136 case SYMBOL_PLAINVAL
:
3137 /* The most common case is that of a non-constant symbol with a
3138 trivial value. Make that as fast as we can. */
3139 specpdl_ptr
->let
.kind
= SPECPDL_LET
;
3140 specpdl_ptr
->let
.symbol
= symbol
;
3141 specpdl_ptr
->let
.old_value
= SYMBOL_VAL (sym
);
3144 SET_SYMBOL_VAL (sym
, value
);
3146 set_internal (symbol
, value
, Qnil
, 1);
3148 case SYMBOL_LOCALIZED
:
3149 if (SYMBOL_BLV (sym
)->frame_local
)
3150 error ("Frame-local vars cannot be let-bound");
3151 case SYMBOL_FORWARDED
:
3153 Lisp_Object ovalue
= find_symbol_value (symbol
);
3154 specpdl_ptr
->let
.kind
= SPECPDL_LET_LOCAL
;
3155 specpdl_ptr
->let
.symbol
= symbol
;
3156 specpdl_ptr
->let
.old_value
= ovalue
;
3157 specpdl_ptr
->let
.where
= Fcurrent_buffer ();
3159 eassert (sym
->redirect
!= SYMBOL_LOCALIZED
3160 || (EQ (SYMBOL_BLV (sym
)->where
, Fcurrent_buffer ())));
3162 if (sym
->redirect
== SYMBOL_LOCALIZED
)
3164 if (!blv_found (SYMBOL_BLV (sym
)))
3165 specpdl_ptr
->let
.kind
= SPECPDL_LET_DEFAULT
;
3167 else if (BUFFER_OBJFWDP (SYMBOL_FWD (sym
)))
3169 /* If SYMBOL is a per-buffer variable which doesn't have a
3170 buffer-local value here, make the `let' change the global
3171 value by changing the value of SYMBOL in all buffers not
3172 having their own value. This is consistent with what
3173 happens with other buffer-local variables. */
3174 if (NILP (Flocal_variable_p (symbol
, Qnil
)))
3176 specpdl_ptr
->let
.kind
= SPECPDL_LET_DEFAULT
;
3178 Fset_default (symbol
, value
);
3183 specpdl_ptr
->let
.kind
= SPECPDL_LET
;
3186 set_internal (symbol
, value
, Qnil
, 1);
3189 default: emacs_abort ();
3193 /* Push unwind-protect entries of various types. */
3196 record_unwind_protect (void (*function
) (Lisp_Object
), Lisp_Object arg
)
3198 specpdl_ptr
->unwind
.kind
= SPECPDL_UNWIND
;
3199 specpdl_ptr
->unwind
.func
= function
;
3200 specpdl_ptr
->unwind
.arg
= arg
;
3205 record_unwind_protect_ptr (void (*function
) (void *), void *arg
)
3207 specpdl_ptr
->unwind_ptr
.kind
= SPECPDL_UNWIND_PTR
;
3208 specpdl_ptr
->unwind_ptr
.func
= function
;
3209 specpdl_ptr
->unwind_ptr
.arg
= arg
;
3214 record_unwind_protect_int (void (*function
) (int), int arg
)
3216 specpdl_ptr
->unwind_int
.kind
= SPECPDL_UNWIND_INT
;
3217 specpdl_ptr
->unwind_int
.func
= function
;
3218 specpdl_ptr
->unwind_int
.arg
= arg
;
3223 record_unwind_protect_void (void (*function
) (void))
3225 specpdl_ptr
->unwind_void
.kind
= SPECPDL_UNWIND_VOID
;
3226 specpdl_ptr
->unwind_void
.func
= function
;
3234 /* Push an unwind-protect entry that does nothing, so that
3235 set_unwind_protect_ptr can overwrite it later. */
3238 record_unwind_protect_nothing (void)
3240 record_unwind_protect_void (do_nothing
);
3243 /* Clear the unwind-protect entry COUNT, so that it does nothing.
3244 It need not be at the top of the stack. */
3247 clear_unwind_protect (ptrdiff_t count
)
3249 union specbinding
*p
= specpdl
+ count
;
3250 p
->unwind_void
.kind
= SPECPDL_UNWIND_VOID
;
3251 p
->unwind_void
.func
= do_nothing
;
3254 /* Set the unwind-protect entry COUNT so that it invokes FUNC (ARG).
3255 It need not be at the top of the stack. Discard the entry's
3256 previous value without invoking it. */
3259 set_unwind_protect (ptrdiff_t count
, void (*func
) (Lisp_Object
),
3262 union specbinding
*p
= specpdl
+ count
;
3263 p
->unwind
.kind
= SPECPDL_UNWIND
;
3264 p
->unwind
.func
= func
;
3265 p
->unwind
.arg
= arg
;
3269 set_unwind_protect_ptr (ptrdiff_t count
, void (*func
) (void *), void *arg
)
3271 union specbinding
*p
= specpdl
+ count
;
3272 p
->unwind_ptr
.kind
= SPECPDL_UNWIND_PTR
;
3273 p
->unwind_ptr
.func
= func
;
3274 p
->unwind_ptr
.arg
= arg
;
3277 /* Pop and execute entries from the unwind-protect stack until the
3278 depth COUNT is reached. Return VALUE. */
3281 unbind_to (ptrdiff_t count
, Lisp_Object value
)
3283 Lisp_Object quitf
= Vquit_flag
;
3284 struct gcpro gcpro1
, gcpro2
;
3286 GCPRO2 (value
, quitf
);
3289 while (specpdl_ptr
!= specpdl
+ count
)
3291 /* Decrement specpdl_ptr before we do the work to unbind it, so
3292 that an error in unbinding won't try to unbind the same entry
3293 again. Take care to copy any parts of the binding needed
3294 before invoking any code that can make more bindings. */
3298 switch (specpdl_ptr
->kind
)
3300 case SPECPDL_UNWIND
:
3301 specpdl_ptr
->unwind
.func (specpdl_ptr
->unwind
.arg
);
3303 case SPECPDL_UNWIND_PTR
:
3304 specpdl_ptr
->unwind_ptr
.func (specpdl_ptr
->unwind_ptr
.arg
);
3306 case SPECPDL_UNWIND_INT
:
3307 specpdl_ptr
->unwind_int
.func (specpdl_ptr
->unwind_int
.arg
);
3309 case SPECPDL_UNWIND_VOID
:
3310 specpdl_ptr
->unwind_void
.func ();
3312 case SPECPDL_BACKTRACE
:
3315 { /* If variable has a trivial value (no forwarding), we can
3316 just set it. No need to check for constant symbols here,
3317 since that was already done by specbind. */
3318 struct Lisp_Symbol
*sym
= XSYMBOL (specpdl_symbol (specpdl_ptr
));
3319 if (sym
->redirect
== SYMBOL_PLAINVAL
)
3321 SET_SYMBOL_VAL (sym
, specpdl_old_value (specpdl_ptr
));
3326 NOTE: we only ever come here if make_local_foo was used for
3327 the first time on this var within this let. */
3330 case SPECPDL_LET_DEFAULT
:
3331 Fset_default (specpdl_symbol (specpdl_ptr
),
3332 specpdl_old_value (specpdl_ptr
));
3334 case SPECPDL_LET_LOCAL
:
3336 Lisp_Object symbol
= specpdl_symbol (specpdl_ptr
);
3337 Lisp_Object where
= specpdl_where (specpdl_ptr
);
3338 Lisp_Object old_value
= specpdl_old_value (specpdl_ptr
);
3339 eassert (BUFFERP (where
));
3341 /* If this was a local binding, reset the value in the appropriate
3342 buffer, but only if that buffer's binding still exists. */
3343 if (!NILP (Flocal_variable_p (symbol
, where
)))
3344 set_internal (symbol
, old_value
, where
, 1);
3350 if (NILP (Vquit_flag
) && !NILP (quitf
))
3357 DEFUN ("special-variable-p", Fspecial_variable_p
, Sspecial_variable_p
, 1, 1, 0,
3358 doc
: /* Return non-nil if SYMBOL's global binding has been declared special.
3359 A special variable is one that will be bound dynamically, even in a
3360 context where binding is lexical by default. */)
3361 (Lisp_Object symbol
)
3363 CHECK_SYMBOL (symbol
);
3364 return XSYMBOL (symbol
)->declared_special
? Qt
: Qnil
;
3368 DEFUN ("backtrace-debug", Fbacktrace_debug
, Sbacktrace_debug
, 2, 2, 0,
3369 doc
: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.
3370 The debugger is entered when that frame exits, if the flag is non-nil. */)
3371 (Lisp_Object level
, Lisp_Object flag
)
3373 union specbinding
*pdl
= backtrace_top ();
3374 register EMACS_INT i
;
3376 CHECK_NUMBER (level
);
3378 for (i
= 0; backtrace_p (pdl
) && i
< XINT (level
); i
++)
3379 pdl
= backtrace_next (pdl
);
3381 if (backtrace_p (pdl
))
3382 set_backtrace_debug_on_exit (pdl
, !NILP (flag
));
3387 DEFUN ("backtrace", Fbacktrace
, Sbacktrace
, 0, 0, "",
3388 doc
: /* Print a trace of Lisp function calls currently active.
3389 Output stream used is value of `standard-output'. */)
3392 union specbinding
*pdl
= backtrace_top ();
3394 Lisp_Object old_print_level
= Vprint_level
;
3396 if (NILP (Vprint_level
))
3397 XSETFASTINT (Vprint_level
, 8);
3399 while (backtrace_p (pdl
))
3401 write_string (backtrace_debug_on_exit (pdl
) ? "* " : " ", 2);
3402 if (backtrace_nargs (pdl
) == UNEVALLED
)
3404 Fprin1 (Fcons (backtrace_function (pdl
), *backtrace_args (pdl
)),
3406 write_string ("\n", -1);
3410 tem
= backtrace_function (pdl
);
3411 Fprin1 (tem
, Qnil
); /* This can QUIT. */
3412 write_string ("(", -1);
3415 for (i
= 0; i
< backtrace_nargs (pdl
); i
++)
3417 if (i
) write_string (" ", -1);
3418 Fprin1 (backtrace_args (pdl
)[i
], Qnil
);
3421 write_string (")\n", -1);
3423 pdl
= backtrace_next (pdl
);
3426 Vprint_level
= old_print_level
;
3430 static union specbinding
*
3431 get_backtrace_frame (Lisp_Object nframes
, Lisp_Object base
)
3433 union specbinding
*pdl
= backtrace_top ();
3434 register EMACS_INT i
;
3436 CHECK_NATNUM (nframes
);
3439 { /* Skip up to `base'. */
3440 base
= Findirect_function (base
, Qt
);
3441 while (backtrace_p (pdl
)
3442 && !EQ (base
, Findirect_function (backtrace_function (pdl
), Qt
)))
3443 pdl
= backtrace_next (pdl
);
3446 /* Find the frame requested. */
3447 for (i
= XFASTINT (nframes
); i
> 0 && backtrace_p (pdl
); i
--)
3448 pdl
= backtrace_next (pdl
);
3453 DEFUN ("backtrace-frame", Fbacktrace_frame
, Sbacktrace_frame
, 1, 2, NULL
,
3454 doc
: /* Return the function and arguments NFRAMES up from current execution point.
3455 If that frame has not evaluated the arguments yet (or is a special form),
3456 the value is (nil FUNCTION ARG-FORMS...).
3457 If that frame has evaluated its arguments and called its function already,
3458 the value is (t FUNCTION ARG-VALUES...).
3459 A &rest arg is represented as the tail of the list ARG-VALUES.
3460 FUNCTION is whatever was supplied as car of evaluated list,
3461 or a lambda expression for macro calls.
3462 If NFRAMES is more than the number of frames, the value is nil.
3463 If BASE is non-nil, it should be a function and NFRAMES counts from its
3464 nearest activation frame. */)
3465 (Lisp_Object nframes
, Lisp_Object base
)
3467 union specbinding
*pdl
= get_backtrace_frame (nframes
, base
);
3469 if (!backtrace_p (pdl
))
3471 if (backtrace_nargs (pdl
) == UNEVALLED
)
3473 Fcons (backtrace_function (pdl
), *backtrace_args (pdl
)));
3476 Lisp_Object tem
= Flist (backtrace_nargs (pdl
), backtrace_args (pdl
));
3478 return Fcons (Qt
, Fcons (backtrace_function (pdl
), tem
));
3482 /* For backtrace-eval, we want to temporarily unwind the last few elements of
3483 the specpdl stack, and then rewind them. We store the pre-unwind values
3484 directly in the pre-existing specpdl elements (i.e. we swap the current
3485 value and the old value stored in the specpdl), kind of like the inplace
3486 pointer-reversal trick. As it turns out, the rewind does the same as the
3487 unwind, except it starts from the other end of the specpdl stack, so we use
3488 the same function for both unwind and rewind. */
3490 backtrace_eval_unrewind (int distance
)
3492 union specbinding
*tmp
= specpdl_ptr
;
3495 { /* It's a rewind rather than unwind. */
3496 tmp
+= distance
- 1;
3498 distance
= -distance
;
3501 for (; distance
> 0; distance
--)
3507 /* FIXME: Ideally we'd like to "temporarily unwind" (some of) those
3508 unwind_protect, but the problem is that we don't know how to
3509 rewind them afterwards. */
3510 case SPECPDL_UNWIND
:
3511 case SPECPDL_UNWIND_PTR
:
3512 case SPECPDL_UNWIND_INT
:
3513 case SPECPDL_UNWIND_VOID
:
3514 case SPECPDL_BACKTRACE
:
3517 { /* If variable has a trivial value (no forwarding), we can
3518 just set it. No need to check for constant symbols here,
3519 since that was already done by specbind. */
3520 struct Lisp_Symbol
*sym
= XSYMBOL (specpdl_symbol (tmp
));
3521 if (sym
->redirect
== SYMBOL_PLAINVAL
)
3523 Lisp_Object old_value
= specpdl_old_value (tmp
);
3524 set_specpdl_old_value (tmp
, SYMBOL_VAL (sym
));
3525 SET_SYMBOL_VAL (sym
, old_value
);
3530 NOTE: we only ever come here if make_local_foo was used for
3531 the first time on this var within this let. */
3534 case SPECPDL_LET_DEFAULT
:
3536 Lisp_Object sym
= specpdl_symbol (tmp
);
3537 Lisp_Object old_value
= specpdl_old_value (tmp
);
3538 set_specpdl_old_value (tmp
, Fdefault_value (sym
));
3539 Fset_default (sym
, old_value
);
3542 case SPECPDL_LET_LOCAL
:
3544 Lisp_Object symbol
= specpdl_symbol (tmp
);
3545 Lisp_Object where
= specpdl_where (tmp
);
3546 Lisp_Object old_value
= specpdl_old_value (tmp
);
3547 eassert (BUFFERP (where
));
3549 /* If this was a local binding, reset the value in the appropriate
3550 buffer, but only if that buffer's binding still exists. */
3551 if (!NILP (Flocal_variable_p (symbol
, where
)))
3553 set_specpdl_old_value
3554 (tmp
, Fbuffer_local_value (symbol
, where
));
3555 set_internal (symbol
, old_value
, where
, 1);
3563 DEFUN ("backtrace-eval", Fbacktrace_eval
, Sbacktrace_eval
, 2, 3, NULL
,
3564 doc
: /* Evaluate EXP in the context of some activation frame.
3565 NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */)
3566 (Lisp_Object exp
, Lisp_Object nframes
, Lisp_Object base
)
3568 union specbinding
*pdl
= get_backtrace_frame (nframes
, base
);
3569 ptrdiff_t count
= SPECPDL_INDEX ();
3570 ptrdiff_t distance
= specpdl_ptr
- pdl
;
3571 eassert (distance
>= 0);
3573 if (!backtrace_p (pdl
))
3574 error ("Activation frame not found!");
3576 backtrace_eval_unrewind (distance
);
3577 record_unwind_protect_int (backtrace_eval_unrewind
, -distance
);
3579 /* Use eval_sub rather than Feval since the main motivation behind
3580 backtrace-eval is to be able to get/set the value of lexical variables
3581 from the debugger. */
3582 return unbind_to (count
, eval_sub (exp
));
3585 DEFUN ("backtrace--locals", Fbacktrace__locals
, Sbacktrace__locals
, 1, 2, NULL
,
3586 doc
: /* Return names and values of local variables of a stack frame.
3587 NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */)
3588 (Lisp_Object nframes
, Lisp_Object base
)
3590 union specbinding
*frame
= get_backtrace_frame (nframes
, base
);
3591 union specbinding
*prevframe
3592 = get_backtrace_frame (make_number (XFASTINT (nframes
) - 1), base
);
3593 ptrdiff_t distance
= specpdl_ptr
- frame
;
3594 Lisp_Object result
= Qnil
;
3595 eassert (distance
>= 0);
3597 if (!backtrace_p (prevframe
))
3598 error ("Activation frame not found!");
3599 if (!backtrace_p (frame
))
3600 error ("Activation frame not found!");
3602 /* The specpdl entries normally contain the symbol being bound along with its
3603 `old_value', so it can be restored. The new value to which it is bound is
3604 available in one of two places: either in the current value of the
3605 variable (if it hasn't been rebound yet) or in the `old_value' slot of the
3606 next specpdl entry for it.
3607 `backtrace_eval_unrewind' happens to swap the role of `old_value'
3608 and "new value", so we abuse it here, to fetch the new value.
3609 It's ugly (we'd rather not modify global data) and a bit inefficient,
3610 but it does the job for now. */
3611 backtrace_eval_unrewind (distance
);
3615 union specbinding
*tmp
= prevframe
;
3616 for (; tmp
> frame
; tmp
--)
3621 case SPECPDL_LET_DEFAULT
:
3622 case SPECPDL_LET_LOCAL
:
3624 Lisp_Object sym
= specpdl_symbol (tmp
);
3625 Lisp_Object val
= specpdl_old_value (tmp
);
3626 if (EQ (sym
, Qinternal_interpreter_environment
))
3628 Lisp_Object env
= val
;
3629 for (; CONSP (env
); env
= XCDR (env
))
3631 Lisp_Object binding
= XCAR (env
);
3632 if (CONSP (binding
))
3633 result
= Fcons (Fcons (XCAR (binding
),
3639 result
= Fcons (Fcons (sym
, val
), result
);
3645 /* Restore values from specpdl to original place. */
3646 backtrace_eval_unrewind (-distance
);
3655 union specbinding
*pdl
;
3656 for (pdl
= specpdl
; pdl
!= specpdl_ptr
; pdl
++)
3660 case SPECPDL_UNWIND
:
3661 mark_object (specpdl_arg (pdl
));
3664 case SPECPDL_BACKTRACE
:
3666 ptrdiff_t nargs
= backtrace_nargs (pdl
);
3667 mark_object (backtrace_function (pdl
));
3668 if (nargs
== UNEVALLED
)
3671 mark_object (backtrace_args (pdl
)[nargs
]);
3675 case SPECPDL_LET_DEFAULT
:
3676 case SPECPDL_LET_LOCAL
:
3677 mark_object (specpdl_where (pdl
));
3680 mark_object (specpdl_symbol (pdl
));
3681 mark_object (specpdl_old_value (pdl
));
3688 get_backtrace (Lisp_Object array
)
3690 union specbinding
*pdl
= backtrace_next (backtrace_top ());
3691 ptrdiff_t i
= 0, asize
= ASIZE (array
);
3693 /* Copy the backtrace contents into working memory. */
3694 for (; i
< asize
; i
++)
3696 if (backtrace_p (pdl
))
3698 ASET (array
, i
, backtrace_function (pdl
));
3699 pdl
= backtrace_next (pdl
);
3702 ASET (array
, i
, Qnil
);
3706 Lisp_Object
backtrace_top_function (void)
3708 union specbinding
*pdl
= backtrace_top ();
3709 return (backtrace_p (pdl
) ? backtrace_function (pdl
) : Qnil
);
3715 DEFVAR_INT ("max-specpdl-size", max_specpdl_size
,
3716 doc
: /* Limit on number of Lisp variable bindings and `unwind-protect's.
3717 If Lisp code tries to increase the total number past this amount,
3718 an error is signaled.
3719 You can safely use a value considerably larger than the default value,
3720 if that proves inconveniently small. However, if you increase it too far,
3721 Emacs could run out of memory trying to make the stack bigger.
3722 Note that this limit may be silently increased by the debugger
3723 if `debug-on-error' or `debug-on-quit' is set. */);
3725 DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth
,
3726 doc
: /* Limit on depth in `eval', `apply' and `funcall' before error.
3728 This limit serves to catch infinite recursions for you before they cause
3729 actual stack overflow in C, which would be fatal for Emacs.
3730 You can safely make it considerably larger than its default value,
3731 if that proves inconveniently small. However, if you increase it too far,
3732 Emacs could overflow the real C stack, and crash. */);
3734 DEFVAR_LISP ("quit-flag", Vquit_flag
,
3735 doc
: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.
3736 If the value is t, that means do an ordinary quit.
3737 If the value equals `throw-on-input', that means quit by throwing
3738 to the tag specified in `throw-on-input'; it's for handling `while-no-input'.
3739 Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit',
3740 but `inhibit-quit' non-nil prevents anything from taking notice of that. */);
3743 DEFVAR_LISP ("inhibit-quit", Vinhibit_quit
,
3744 doc
: /* Non-nil inhibits C-g quitting from happening immediately.
3745 Note that `quit-flag' will still be set by typing C-g,
3746 so a quit will be signaled as soon as `inhibit-quit' is nil.
3747 To prevent this happening, set `quit-flag' to nil
3748 before making `inhibit-quit' nil. */);
3749 Vinhibit_quit
= Qnil
;
3751 DEFSYM (Qinhibit_quit
, "inhibit-quit");
3752 DEFSYM (Qautoload
, "autoload");
3753 DEFSYM (Qinhibit_debugger
, "inhibit-debugger");
3754 DEFSYM (Qmacro
, "macro");
3755 DEFSYM (Qdeclare
, "declare");
3757 /* Note that the process handling also uses Qexit, but we don't want
3758 to staticpro it twice, so we just do it here. */
3759 DEFSYM (Qexit
, "exit");
3761 DEFSYM (Qinteractive
, "interactive");
3762 DEFSYM (Qcommandp
, "commandp");
3763 DEFSYM (Qand_rest
, "&rest");
3764 DEFSYM (Qand_optional
, "&optional");
3765 DEFSYM (Qclosure
, "closure");
3766 DEFSYM (Qdebug
, "debug");
3768 DEFVAR_LISP ("inhibit-debugger", Vinhibit_debugger
,
3769 doc
: /* Non-nil means never enter the debugger.
3770 Normally set while the debugger is already active, to avoid recursive
3772 Vinhibit_debugger
= Qnil
;
3774 DEFVAR_LISP ("debug-on-error", Vdebug_on_error
,
3775 doc
: /* Non-nil means enter debugger if an error is signaled.
3776 Does not apply to errors handled by `condition-case' or those
3777 matched by `debug-ignored-errors'.
3778 If the value is a list, an error only means to enter the debugger
3779 if one of its condition symbols appears in the list.
3780 When you evaluate an expression interactively, this variable
3781 is temporarily non-nil if `eval-expression-debug-on-error' is non-nil.
3782 The command `toggle-debug-on-error' toggles this.
3783 See also the variable `debug-on-quit' and `inhibit-debugger'. */);
3784 Vdebug_on_error
= Qnil
;
3786 DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors
,
3787 doc
: /* List of errors for which the debugger should not be called.
3788 Each element may be a condition-name or a regexp that matches error messages.
3789 If any element applies to a given error, that error skips the debugger
3790 and just returns to top level.
3791 This overrides the variable `debug-on-error'.
3792 It does not apply to errors handled by `condition-case'. */);
3793 Vdebug_ignored_errors
= Qnil
;
3795 DEFVAR_BOOL ("debug-on-quit", debug_on_quit
,
3796 doc
: /* Non-nil means enter debugger if quit is signaled (C-g, for example).
3797 Does not apply if quit is handled by a `condition-case'. */);
3800 DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call
,
3801 doc
: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */);
3803 DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue
,
3804 doc
: /* Non-nil means debugger may continue execution.
3805 This is nil when the debugger is called under circumstances where it
3806 might not be safe to continue. */);
3807 debugger_may_continue
= 1;
3809 DEFVAR_LISP ("debugger", Vdebugger
,
3810 doc
: /* Function to call to invoke debugger.
3811 If due to frame exit, args are `exit' and the value being returned;
3812 this function's value will be returned instead of that.
3813 If due to error, args are `error' and a list of the args to `signal'.
3814 If due to `apply' or `funcall' entry, one arg, `lambda'.
3815 If due to `eval' entry, one arg, t. */);
3818 DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function
,
3819 doc
: /* If non-nil, this is a function for `signal' to call.
3820 It receives the same arguments that `signal' was given.
3821 The Edebug package uses this to regain control. */);
3822 Vsignal_hook_function
= Qnil
;
3824 DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal
,
3825 doc
: /* Non-nil means call the debugger regardless of condition handlers.
3826 Note that `debug-on-error', `debug-on-quit' and friends
3827 still determine whether to handle the particular condition. */);
3828 Vdebug_on_signal
= Qnil
;
3830 /* When lexical binding is being used,
3831 Vinternal_interpreter_environment is non-nil, and contains an alist
3832 of lexically-bound variable, or (t), indicating an empty
3833 environment. The lisp name of this variable would be
3834 `internal-interpreter-environment' if it weren't hidden.
3835 Every element of this list can be either a cons (VAR . VAL)
3836 specifying a lexical binding, or a single symbol VAR indicating
3837 that this variable should use dynamic scoping. */
3838 DEFSYM (Qinternal_interpreter_environment
,
3839 "internal-interpreter-environment");
3840 DEFVAR_LISP ("internal-interpreter-environment",
3841 Vinternal_interpreter_environment
,
3842 doc
: /* If non-nil, the current lexical environment of the lisp interpreter.
3843 When lexical binding is not being used, this variable is nil.
3844 A value of `(t)' indicates an empty environment, otherwise it is an
3845 alist of active lexical bindings. */);
3846 Vinternal_interpreter_environment
= Qnil
;
3847 /* Don't export this variable to Elisp, so no one can mess with it
3848 (Just imagine if someone makes it buffer-local). */
3849 Funintern (Qinternal_interpreter_environment
, Qnil
);
3851 DEFSYM (Vrun_hooks
, "run-hooks");
3853 staticpro (&Vautoload_queue
);
3854 Vautoload_queue
= Qnil
;
3855 staticpro (&Vsignaling_function
);
3856 Vsignaling_function
= Qnil
;
3858 inhibit_lisp_code
= Qnil
;
3869 defsubr (&Sfunction
);
3870 defsubr (&Sdefault_toplevel_value
);
3871 defsubr (&Sset_default_toplevel_value
);
3873 defsubr (&Sdefvaralias
);
3874 defsubr (&Sdefconst
);
3875 defsubr (&Smake_var_non_special
);
3879 defsubr (&Smacroexpand
);
3882 defsubr (&Sunwind_protect
);
3883 defsubr (&Scondition_case
);
3885 defsubr (&Scommandp
);
3886 defsubr (&Sautoload
);
3887 defsubr (&Sautoload_do_load
);
3890 defsubr (&Sfuncall
);
3891 defsubr (&Srun_hooks
);
3892 defsubr (&Srun_hook_with_args
);
3893 defsubr (&Srun_hook_with_args_until_success
);
3894 defsubr (&Srun_hook_with_args_until_failure
);
3895 defsubr (&Srun_hook_wrapped
);
3896 defsubr (&Sfetch_bytecode
);
3897 defsubr (&Sbacktrace_debug
);
3898 defsubr (&Sbacktrace
);
3899 defsubr (&Sbacktrace_frame
);
3900 defsubr (&Sbacktrace_eval
);
3901 defsubr (&Sbacktrace__locals
);
3902 defsubr (&Sspecial_variable_p
);
3903 defsubr (&Sfunctionp
);