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 in
96 an inconsistent state. Currently unused. */
97 Lisp_Object inhibit_lisp_code
;
99 /* These would ordinarily be static, but they need to be visible to GDB. */
100 bool backtrace_p (union specbinding
*) EXTERNALLY_VISIBLE
;
101 Lisp_Object
*backtrace_args (union specbinding
*) EXTERNALLY_VISIBLE
;
102 Lisp_Object
backtrace_function (union specbinding
*) EXTERNALLY_VISIBLE
;
103 union specbinding
*backtrace_next (union specbinding
*) EXTERNALLY_VISIBLE
;
104 union specbinding
*backtrace_top (void) EXTERNALLY_VISIBLE
;
106 static Lisp_Object
funcall_lambda (Lisp_Object
, ptrdiff_t, Lisp_Object
*);
107 static Lisp_Object
apply_lambda (Lisp_Object fun
, Lisp_Object args
);
110 specpdl_symbol (union specbinding
*pdl
)
112 eassert (pdl
->kind
>= SPECPDL_LET
);
113 return pdl
->let
.symbol
;
117 specpdl_old_value (union specbinding
*pdl
)
119 eassert (pdl
->kind
>= SPECPDL_LET
);
120 return pdl
->let
.old_value
;
124 set_specpdl_old_value (union specbinding
*pdl
, Lisp_Object val
)
126 eassert (pdl
->kind
>= SPECPDL_LET
);
127 pdl
->let
.old_value
= val
;
131 specpdl_where (union specbinding
*pdl
)
133 eassert (pdl
->kind
> SPECPDL_LET
);
134 return pdl
->let
.where
;
138 specpdl_arg (union specbinding
*pdl
)
140 eassert (pdl
->kind
== SPECPDL_UNWIND
);
141 return pdl
->unwind
.arg
;
145 backtrace_function (union specbinding
*pdl
)
147 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
148 return pdl
->bt
.function
;
152 backtrace_nargs (union specbinding
*pdl
)
154 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
155 return pdl
->bt
.nargs
;
159 backtrace_args (union specbinding
*pdl
)
161 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
166 backtrace_debug_on_exit (union specbinding
*pdl
)
168 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
169 return pdl
->bt
.debug_on_exit
;
172 /* Functions to modify slots of backtrace records. */
175 set_backtrace_args (union specbinding
*pdl
, Lisp_Object
*args
)
177 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
182 set_backtrace_nargs (union specbinding
*pdl
, ptrdiff_t n
)
184 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
189 set_backtrace_debug_on_exit (union specbinding
*pdl
, bool doe
)
191 eassert (pdl
->kind
== SPECPDL_BACKTRACE
);
192 pdl
->bt
.debug_on_exit
= doe
;
195 /* Helper functions to scan the backtrace. */
198 backtrace_p (union specbinding
*pdl
)
199 { return pdl
>= specpdl
; }
204 union specbinding
*pdl
= specpdl_ptr
- 1;
205 while (backtrace_p (pdl
) && pdl
->kind
!= SPECPDL_BACKTRACE
)
211 backtrace_next (union specbinding
*pdl
)
214 while (backtrace_p (pdl
) && pdl
->kind
!= SPECPDL_BACKTRACE
)
221 init_eval_once (void)
224 union specbinding
*pdlvec
= xmalloc ((size
+ 1) * sizeof *specpdl
);
226 specpdl
= specpdl_ptr
= pdlvec
+ 1;
227 /* Don't forget to update docs (lispref node "Local Variables"). */
228 max_specpdl_size
= 1300; /* 1000 is not enough for CEDET's c-by.el. */
229 max_lisp_eval_depth
= 600;
234 static struct handler handlerlist_sentinel
;
239 specpdl_ptr
= specpdl
;
240 { /* Put a dummy catcher at top-level so that handlerlist is never NULL.
241 This is important since handlerlist->nextfree holds the freelist
242 which would otherwise leak every time we unwind back to top-level. */
244 handlerlist
= handlerlist_sentinel
.nextfree
= &handlerlist_sentinel
;
245 PUSH_HANDLER (c
, Qunbound
, CATCHER
);
246 eassert (c
== &handlerlist_sentinel
);
247 handlerlist_sentinel
.nextfree
= NULL
;
248 handlerlist_sentinel
.next
= NULL
;
251 debug_on_next_call
= 0;
256 /* This is less than the initial value of num_nonmacro_input_events. */
257 when_entered_debugger
= -1;
260 /* Unwind-protect function used by call_debugger. */
263 restore_stack_limits (Lisp_Object data
)
265 max_specpdl_size
= XINT (XCAR (data
));
266 max_lisp_eval_depth
= XINT (XCDR (data
));
269 static void grow_specpdl (void);
271 /* Call the Lisp debugger, giving it argument ARG. */
274 call_debugger (Lisp_Object arg
)
276 bool debug_while_redisplaying
;
277 ptrdiff_t count
= SPECPDL_INDEX ();
279 EMACS_INT old_depth
= max_lisp_eval_depth
;
280 /* Do not allow max_specpdl_size less than actual depth (Bug#16603). */
281 EMACS_INT old_max
= max (max_specpdl_size
, count
);
283 if (lisp_eval_depth
+ 40 > max_lisp_eval_depth
)
284 max_lisp_eval_depth
= lisp_eval_depth
+ 40;
286 /* While debugging Bug#16603, previous value of 100 was found
287 too small to avoid specpdl overflow in the debugger itself. */
288 if (max_specpdl_size
- 200 < count
)
289 max_specpdl_size
= count
+ 200;
291 if (old_max
== count
)
293 /* We can enter the debugger due to specpdl overflow (Bug#16603). */
298 /* Restore limits after leaving the debugger. */
299 record_unwind_protect (restore_stack_limits
,
300 Fcons (make_number (old_max
),
301 make_number (old_depth
)));
303 #ifdef HAVE_WINDOW_SYSTEM
304 if (display_hourglass_p
)
308 debug_on_next_call
= 0;
309 when_entered_debugger
= num_nonmacro_input_events
;
311 /* Resetting redisplaying_p to 0 makes sure that debug output is
312 displayed if the debugger is invoked during redisplay. */
313 debug_while_redisplaying
= redisplaying_p
;
315 specbind (intern ("debugger-may-continue"),
316 debug_while_redisplaying
? Qnil
: Qt
);
317 specbind (Qinhibit_redisplay
, Qnil
);
318 specbind (Qinhibit_debugger
, Qt
);
320 #if 0 /* Binding this prevents execution of Lisp code during
321 redisplay, which necessarily leads to display problems. */
322 specbind (Qinhibit_eval_during_redisplay
, Qt
);
325 val
= apply1 (Vdebugger
, arg
);
327 /* Interrupting redisplay and resuming it later is not safe under
328 all circumstances. So, when the debugger returns, abort the
329 interrupted redisplay by going back to the top-level. */
330 if (debug_while_redisplaying
)
333 return unbind_to (count
, val
);
337 do_debug_on_call (Lisp_Object code
)
339 debug_on_next_call
= 0;
340 set_backtrace_debug_on_exit (specpdl_ptr
- 1, true);
341 call_debugger (list1 (code
));
344 /* NOTE!!! Every function that can call EVAL must protect its args
345 and temporaries from garbage collection while it needs them.
346 The definition of `For' shows what you have to do. */
348 DEFUN ("or", For
, Sor
, 0, UNEVALLED
, 0,
349 doc
: /* Eval args until one of them yields non-nil, then return that value.
350 The remaining args are not evalled at all.
351 If all args return nil, return nil.
352 usage: (or CONDITIONS...) */)
355 register Lisp_Object val
= Qnil
;
362 val
= eval_sub (XCAR (args
));
372 DEFUN ("and", Fand
, Sand
, 0, UNEVALLED
, 0,
373 doc
: /* Eval args until one of them yields nil, then return nil.
374 The remaining args are not evalled at all.
375 If no arg yields nil, return the last arg's value.
376 usage: (and CONDITIONS...) */)
379 register Lisp_Object val
= Qt
;
386 val
= eval_sub (XCAR (args
));
396 DEFUN ("if", Fif
, Sif
, 2, UNEVALLED
, 0,
397 doc
: /* If COND yields non-nil, do THEN, else do ELSE...
398 Returns the value of THEN or the value of the last of the ELSE's.
399 THEN must be one expression, but ELSE... can be zero or more expressions.
400 If COND yields nil, and there are no ELSE's, the value is nil.
401 usage: (if COND THEN ELSE...) */)
408 cond
= eval_sub (XCAR (args
));
412 return eval_sub (Fcar (XCDR (args
)));
413 return Fprogn (XCDR (XCDR (args
)));
416 DEFUN ("cond", Fcond
, Scond
, 0, UNEVALLED
, 0,
417 doc
: /* Try each clause until one succeeds.
418 Each clause looks like (CONDITION BODY...). CONDITION is evaluated
419 and, if the value is non-nil, this clause succeeds:
420 then the expressions in BODY are evaluated and the last one's
421 value is the value of the cond-form.
422 If a clause has one element, as in (CONDITION), then the cond-form
423 returns CONDITION's value, if that is non-nil.
424 If no clause succeeds, cond returns nil.
425 usage: (cond CLAUSES...) */)
428 Lisp_Object val
= args
;
434 Lisp_Object clause
= XCAR (args
);
435 val
= eval_sub (Fcar (clause
));
438 if (!NILP (XCDR (clause
)))
439 val
= Fprogn (XCDR (clause
));
449 DEFUN ("progn", Fprogn
, Sprogn
, 0, UNEVALLED
, 0,
450 doc
: /* Eval BODY forms sequentially and return value of last one.
451 usage: (progn BODY...) */)
454 Lisp_Object val
= Qnil
;
461 val
= eval_sub (XCAR (body
));
469 /* Evaluate BODY sequentially, discarding its value. Suitable for
470 record_unwind_protect. */
473 unwind_body (Lisp_Object body
)
478 DEFUN ("prog1", Fprog1
, Sprog1
, 1, UNEVALLED
, 0,
479 doc
: /* Eval FIRST and BODY sequentially; return value from FIRST.
480 The value of FIRST is saved during the evaluation of the remaining args,
481 whose values are discarded.
482 usage: (prog1 FIRST BODY...) */)
486 Lisp_Object args_left
;
487 struct gcpro gcpro1
, gcpro2
;
493 val
= eval_sub (XCAR (args_left
));
494 while (CONSP (args_left
= XCDR (args_left
)))
495 eval_sub (XCAR (args_left
));
501 DEFUN ("prog2", Fprog2
, Sprog2
, 2, UNEVALLED
, 0,
502 doc
: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2.
503 The value of FORM2 is saved during the evaluation of the
504 remaining args, whose values are discarded.
505 usage: (prog2 FORM1 FORM2 BODY...) */)
511 eval_sub (XCAR (args
));
513 return Fprog1 (XCDR (args
));
516 DEFUN ("setq", Fsetq
, Ssetq
, 0, UNEVALLED
, 0,
517 doc
: /* Set each SYM to the value of its VAL.
518 The symbols SYM are variables; they are literal (not evaluated).
519 The values VAL are expressions; they are evaluated.
520 Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.
521 The second VAL is not computed until after the first SYM is set, and so on;
522 each VAL can use the new value of variables set earlier in the `setq'.
523 The return value of the `setq' form is the value of the last VAL.
524 usage: (setq [SYM VAL]...) */)
527 Lisp_Object val
, sym
, lex_binding
;
532 Lisp_Object args_left
= args
;
538 val
= eval_sub (Fcar (XCDR (args_left
)));
539 sym
= XCAR (args_left
);
541 /* Like for eval_sub, we do not check declared_special here since
542 it's been done when let-binding. */
543 if (!NILP (Vinternal_interpreter_environment
) /* Mere optimization! */
545 && !NILP (lex_binding
546 = Fassq (sym
, Vinternal_interpreter_environment
)))
547 XSETCDR (lex_binding
, val
); /* SYM is lexically bound. */
549 Fset (sym
, val
); /* SYM is dynamically bound. */
551 args_left
= Fcdr (XCDR (args_left
));
553 while (CONSP (args_left
));
561 DEFUN ("quote", Fquote
, Squote
, 1, UNEVALLED
, 0,
562 doc
: /* Return the argument, without evaluating it. `(quote x)' yields `x'.
563 Warning: `quote' does not construct its return value, but just returns
564 the value that was pre-constructed by the Lisp reader (see info node
565 `(elisp)Printed Representation').
566 This means that '(a . b) is not identical to (cons 'a 'b): the former
567 does not cons. Quoting should be reserved for constants that will
568 never be modified by side-effects, unless you like self-modifying code.
569 See the common pitfall in info node `(elisp)Rearrangement' for an example
570 of unexpected results when a quoted object is modified.
571 usage: (quote ARG) */)
574 if (CONSP (XCDR (args
)))
575 xsignal2 (Qwrong_number_of_arguments
, Qquote
, Flength (args
));
579 DEFUN ("function", Ffunction
, Sfunction
, 1, UNEVALLED
, 0,
580 doc
: /* Like `quote', but preferred for objects which are functions.
581 In byte compilation, `function' causes its argument to be compiled.
582 `quote' cannot do that.
583 usage: (function ARG) */)
586 Lisp_Object quoted
= XCAR (args
);
588 if (CONSP (XCDR (args
)))
589 xsignal2 (Qwrong_number_of_arguments
, Qfunction
, Flength (args
));
591 if (!NILP (Vinternal_interpreter_environment
)
593 && EQ (XCAR (quoted
), Qlambda
))
594 /* This is a lambda expression within a lexical environment;
595 return an interpreted closure instead of a simple lambda. */
596 return Fcons (Qclosure
, Fcons (Vinternal_interpreter_environment
,
599 /* Simply quote the argument. */
604 DEFUN ("defvaralias", Fdefvaralias
, Sdefvaralias
, 2, 3, 0,
605 doc
: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE.
606 Aliased variables always have the same value; setting one sets the other.
607 Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is
608 omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE,
609 or of the variable at the end of the chain of aliases, if BASE-VARIABLE is
610 itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not,
611 then the value of BASE-VARIABLE is set to that of NEW-ALIAS.
612 The return value is BASE-VARIABLE. */)
613 (Lisp_Object new_alias
, Lisp_Object base_variable
, Lisp_Object docstring
)
615 struct Lisp_Symbol
*sym
;
617 CHECK_SYMBOL (new_alias
);
618 CHECK_SYMBOL (base_variable
);
620 sym
= XSYMBOL (new_alias
);
623 /* Not sure why, but why not? */
624 error ("Cannot make a constant an alias");
626 switch (sym
->redirect
)
628 case SYMBOL_FORWARDED
:
629 error ("Cannot make an internal variable an alias");
630 case SYMBOL_LOCALIZED
:
631 error ("Don't know how to make a localized variable an alias");
634 /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html
635 If n_a is bound, but b_v is not, set the value of b_v to n_a,
636 so that old-code that affects n_a before the aliasing is setup
638 if (NILP (Fboundp (base_variable
)))
639 set_internal (base_variable
, find_symbol_value (new_alias
), Qnil
, 1);
642 union specbinding
*p
;
644 for (p
= specpdl_ptr
; p
> specpdl
; )
645 if ((--p
)->kind
>= SPECPDL_LET
646 && (EQ (new_alias
, specpdl_symbol (p
))))
647 error ("Don't know how to make a let-bound variable an alias");
650 sym
->declared_special
= 1;
651 XSYMBOL (base_variable
)->declared_special
= 1;
652 sym
->redirect
= SYMBOL_VARALIAS
;
653 SET_SYMBOL_ALIAS (sym
, XSYMBOL (base_variable
));
654 sym
->constant
= SYMBOL_CONSTANT_P (base_variable
);
655 LOADHIST_ATTACH (new_alias
);
656 /* Even if docstring is nil: remove old docstring. */
657 Fput (new_alias
, Qvariable_documentation
, docstring
);
659 return base_variable
;
662 static union specbinding
*
663 default_toplevel_binding (Lisp_Object symbol
)
665 union specbinding
*binding
= NULL
;
666 union specbinding
*pdl
= specpdl_ptr
;
667 while (pdl
> specpdl
)
669 switch ((--pdl
)->kind
)
671 case SPECPDL_LET_DEFAULT
:
673 if (EQ (specpdl_symbol (pdl
), symbol
))
681 DEFUN ("default-toplevel-value", Fdefault_toplevel_value
, Sdefault_toplevel_value
, 1, 1, 0,
682 doc
: /* Return SYMBOL's toplevel default value.
683 "Toplevel" means outside of any let binding. */)
686 union specbinding
*binding
= default_toplevel_binding (symbol
);
688 = binding
? specpdl_old_value (binding
) : Fdefault_value (symbol
);
689 if (!EQ (value
, Qunbound
))
691 xsignal1 (Qvoid_variable
, symbol
);
694 DEFUN ("set-default-toplevel-value", Fset_default_toplevel_value
,
695 Sset_default_toplevel_value
, 2, 2, 0,
696 doc
: /* Set SYMBOL's toplevel default value to VALUE.
697 "Toplevel" means outside of any let binding. */)
698 (Lisp_Object symbol
, Lisp_Object value
)
700 union specbinding
*binding
= default_toplevel_binding (symbol
);
702 set_specpdl_old_value (binding
, value
);
704 Fset_default (symbol
, value
);
708 DEFUN ("defvar", Fdefvar
, Sdefvar
, 1, UNEVALLED
, 0,
709 doc
: /* Define SYMBOL as a variable, and return SYMBOL.
710 You are not required to define a variable in order to use it, but
711 defining it lets you supply an initial value and documentation, which
712 can be referred to by the Emacs help facilities and other programming
713 tools. The `defvar' form also declares the variable as \"special\",
714 so that it is always dynamically bound even if `lexical-binding' is t.
716 The optional argument INITVALUE is evaluated, and used to set SYMBOL,
717 only if SYMBOL's value is void. If SYMBOL is buffer-local, its
718 default value is what is set; buffer-local values are not affected.
719 If INITVALUE is missing, SYMBOL's value is not set.
721 If SYMBOL has a local binding, then this form affects the local
722 binding. This is usually not what you want. Thus, if you need to
723 load a file defining variables, with this form or with `defconst' or
724 `defcustom', you should always load that file _outside_ any bindings
725 for these variables. \(`defconst' and `defcustom' behave similarly in
728 The optional argument DOCSTRING is a documentation string for the
731 To define a user option, use `defcustom' instead of `defvar'.
732 usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */)
735 Lisp_Object sym
, tem
, tail
;
742 if (CONSP (XCDR (tail
)) && CONSP (XCDR (XCDR (tail
))))
743 error ("Too many arguments");
745 tem
= Fdefault_boundp (sym
);
747 /* Do it before evaluating the initial value, for self-references. */
748 XSYMBOL (sym
)->declared_special
= 1;
751 Fset_default (sym
, eval_sub (XCAR (tail
)));
753 { /* Check if there is really a global binding rather than just a let
754 binding that shadows the global unboundness of the var. */
755 union specbinding
*binding
= default_toplevel_binding (sym
);
756 if (binding
&& EQ (specpdl_old_value (binding
), Qunbound
))
758 set_specpdl_old_value (binding
, eval_sub (XCAR (tail
)));
765 if (!NILP (Vpurify_flag
))
766 tem
= Fpurecopy (tem
);
767 Fput (sym
, Qvariable_documentation
, tem
);
769 LOADHIST_ATTACH (sym
);
771 else if (!NILP (Vinternal_interpreter_environment
)
772 && !XSYMBOL (sym
)->declared_special
)
773 /* A simple (defvar foo) with lexical scoping does "nothing" except
774 declare that var to be dynamically scoped *locally* (i.e. within
775 the current file or let-block). */
776 Vinternal_interpreter_environment
777 = Fcons (sym
, Vinternal_interpreter_environment
);
780 /* Simple (defvar <var>) should not count as a definition at all.
781 It could get in the way of other definitions, and unloading this
782 package could try to make the variable unbound. */
788 DEFUN ("defconst", Fdefconst
, Sdefconst
, 2, UNEVALLED
, 0,
789 doc
: /* Define SYMBOL as a constant variable.
790 This declares that neither programs nor users should ever change the
791 value. This constancy is not actually enforced by Emacs Lisp, but
792 SYMBOL is marked as a special variable so that it is never lexically
795 The `defconst' form always sets the value of SYMBOL to the result of
796 evalling INITVALUE. If SYMBOL is buffer-local, its default value is
797 what is set; buffer-local values are not affected. If SYMBOL has a
798 local binding, then this form sets the local binding's value.
799 However, you should normally not make local bindings for variables
800 defined with this form.
802 The optional DOCSTRING specifies the variable's documentation string.
803 usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */)
806 Lisp_Object sym
, tem
;
809 if (CONSP (Fcdr (XCDR (XCDR (args
)))))
810 error ("Too many arguments");
812 tem
= eval_sub (Fcar (XCDR (args
)));
813 if (!NILP (Vpurify_flag
))
814 tem
= Fpurecopy (tem
);
815 Fset_default (sym
, tem
);
816 XSYMBOL (sym
)->declared_special
= 1;
817 tem
= Fcar (XCDR (XCDR (args
)));
820 if (!NILP (Vpurify_flag
))
821 tem
= Fpurecopy (tem
);
822 Fput (sym
, Qvariable_documentation
, tem
);
824 Fput (sym
, Qrisky_local_variable
, Qt
);
825 LOADHIST_ATTACH (sym
);
829 /* Make SYMBOL lexically scoped. */
830 DEFUN ("internal-make-var-non-special", Fmake_var_non_special
,
831 Smake_var_non_special
, 1, 1, 0,
832 doc
: /* Internal function. */)
835 CHECK_SYMBOL (symbol
);
836 XSYMBOL (symbol
)->declared_special
= 0;
841 DEFUN ("let*", FletX
, SletX
, 1, UNEVALLED
, 0,
842 doc
: /* Bind variables according to VARLIST then eval BODY.
843 The value of the last form in BODY is returned.
844 Each element of VARLIST is a symbol (which is bound to nil)
845 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
846 Each VALUEFORM can refer to the symbols already bound by this VARLIST.
847 usage: (let* VARLIST BODY...) */)
850 Lisp_Object varlist
, var
, val
, elt
, lexenv
;
851 ptrdiff_t count
= SPECPDL_INDEX ();
852 struct gcpro gcpro1
, gcpro2
, gcpro3
;
854 GCPRO3 (args
, elt
, varlist
);
856 lexenv
= Vinternal_interpreter_environment
;
858 varlist
= XCAR (args
);
859 while (CONSP (varlist
))
863 elt
= XCAR (varlist
);
869 else if (! NILP (Fcdr (Fcdr (elt
))))
870 signal_error ("`let' bindings can have only one value-form", elt
);
874 val
= eval_sub (Fcar (Fcdr (elt
)));
877 if (!NILP (lexenv
) && SYMBOLP (var
)
878 && !XSYMBOL (var
)->declared_special
879 && NILP (Fmemq (var
, Vinternal_interpreter_environment
)))
880 /* Lexically bind VAR by adding it to the interpreter's binding
884 = Fcons (Fcons (var
, val
), Vinternal_interpreter_environment
);
885 if (EQ (Vinternal_interpreter_environment
, lexenv
))
886 /* Save the old lexical environment on the specpdl stack,
887 but only for the first lexical binding, since we'll never
888 need to revert to one of the intermediate ones. */
889 specbind (Qinternal_interpreter_environment
, newenv
);
891 Vinternal_interpreter_environment
= newenv
;
896 varlist
= XCDR (varlist
);
899 val
= Fprogn (XCDR (args
));
900 return unbind_to (count
, val
);
903 DEFUN ("let", Flet
, Slet
, 1, UNEVALLED
, 0,
904 doc
: /* Bind variables according to VARLIST then eval BODY.
905 The value of the last form in BODY is returned.
906 Each element of VARLIST is a symbol (which is bound to nil)
907 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
908 All the VALUEFORMs are evalled before any symbols are bound.
909 usage: (let VARLIST BODY...) */)
912 Lisp_Object
*temps
, tem
, lexenv
;
913 register Lisp_Object elt
, varlist
;
914 ptrdiff_t count
= SPECPDL_INDEX ();
916 struct gcpro gcpro1
, gcpro2
;
919 varlist
= XCAR (args
);
921 /* Make space to hold the values to give the bound variables. */
922 elt
= Flength (varlist
);
923 SAFE_ALLOCA_LISP (temps
, XFASTINT (elt
));
925 /* Compute the values and store them in `temps'. */
927 GCPRO2 (args
, *temps
);
930 for (argnum
= 0; CONSP (varlist
); varlist
= XCDR (varlist
))
933 elt
= XCAR (varlist
);
935 temps
[argnum
++] = Qnil
;
936 else if (! NILP (Fcdr (Fcdr (elt
))))
937 signal_error ("`let' bindings can have only one value-form", elt
);
939 temps
[argnum
++] = eval_sub (Fcar (Fcdr (elt
)));
940 gcpro2
.nvars
= argnum
;
944 lexenv
= Vinternal_interpreter_environment
;
946 varlist
= XCAR (args
);
947 for (argnum
= 0; CONSP (varlist
); varlist
= XCDR (varlist
))
951 elt
= XCAR (varlist
);
952 var
= SYMBOLP (elt
) ? elt
: Fcar (elt
);
953 tem
= temps
[argnum
++];
955 if (!NILP (lexenv
) && SYMBOLP (var
)
956 && !XSYMBOL (var
)->declared_special
957 && NILP (Fmemq (var
, Vinternal_interpreter_environment
)))
958 /* Lexically bind VAR by adding it to the lexenv alist. */
959 lexenv
= Fcons (Fcons (var
, tem
), lexenv
);
961 /* Dynamically bind VAR. */
965 if (!EQ (lexenv
, Vinternal_interpreter_environment
))
966 /* Instantiate a new lexical environment. */
967 specbind (Qinternal_interpreter_environment
, lexenv
);
969 elt
= Fprogn (XCDR (args
));
971 return unbind_to (count
, elt
);
974 DEFUN ("while", Fwhile
, Swhile
, 1, UNEVALLED
, 0,
975 doc
: /* If TEST yields non-nil, eval BODY... and repeat.
976 The order of execution is thus TEST, BODY, TEST, BODY and so on
977 until TEST returns nil.
978 usage: (while TEST BODY...) */)
981 Lisp_Object test
, body
;
982 struct gcpro gcpro1
, gcpro2
;
988 while (!NILP (eval_sub (test
)))
998 DEFUN ("macroexpand", Fmacroexpand
, Smacroexpand
, 1, 2, 0,
999 doc
: /* Return result of expanding macros at top level of FORM.
1000 If FORM is not a macro call, it is returned unchanged.
1001 Otherwise, the macro is expanded and the expansion is considered
1002 in place of FORM. When a non-macro-call results, it is returned.
1004 The second optional arg ENVIRONMENT specifies an environment of macro
1005 definitions to shadow the loaded ones for use in file byte-compilation. */)
1006 (Lisp_Object form
, Lisp_Object environment
)
1008 /* With cleanups from Hallvard Furuseth. */
1009 register Lisp_Object expander
, sym
, def
, tem
;
1013 /* Come back here each time we expand a macro call,
1014 in case it expands into another macro call. */
1017 /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */
1018 def
= sym
= XCAR (form
);
1020 /* Trace symbols aliases to other symbols
1021 until we get a symbol that is not an alias. */
1022 while (SYMBOLP (def
))
1026 tem
= Fassq (sym
, environment
);
1029 def
= XSYMBOL (sym
)->function
;
1035 /* Right now TEM is the result from SYM in ENVIRONMENT,
1036 and if TEM is nil then DEF is SYM's function definition. */
1039 /* SYM is not mentioned in ENVIRONMENT.
1040 Look at its function definition. */
1041 struct gcpro gcpro1
;
1043 def
= Fautoload_do_load (def
, sym
, Qmacro
);
1046 /* Not defined or definition not suitable. */
1048 if (!EQ (XCAR (def
), Qmacro
))
1050 else expander
= XCDR (def
);
1054 expander
= XCDR (tem
);
1055 if (NILP (expander
))
1059 Lisp_Object newform
= apply1 (expander
, XCDR (form
));
1060 if (EQ (form
, newform
))
1069 DEFUN ("catch", Fcatch
, Scatch
, 1, UNEVALLED
, 0,
1070 doc
: /* Eval BODY allowing nonlocal exits using `throw'.
1071 TAG is evalled to get the tag to use; it must not be nil.
1073 Then the BODY is executed.
1074 Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'.
1075 If no throw happens, `catch' returns the value of the last BODY form.
1076 If a throw happens, it specifies the value to return from `catch'.
1077 usage: (catch TAG BODY...) */)
1080 register Lisp_Object tag
;
1081 struct gcpro gcpro1
;
1084 tag
= eval_sub (XCAR (args
));
1086 return internal_catch (tag
, Fprogn
, XCDR (args
));
1089 /* Assert that E is true, as a comment only. Use this instead of
1090 eassert (E) when E contains variables that might be clobbered by a
1093 #define clobbered_eassert(E) ((void) 0)
1095 /* Set up a catch, then call C function FUNC on argument ARG.
1096 FUNC should return a Lisp_Object.
1097 This is how catches are done from within C code. */
1100 internal_catch (Lisp_Object tag
, Lisp_Object (*func
) (Lisp_Object
), Lisp_Object arg
)
1102 /* This structure is made part of the chain `catchlist'. */
1105 /* Fill in the components of c, and put it on the list. */
1106 PUSH_HANDLER (c
, tag
, CATCHER
);
1109 if (! sys_setjmp (c
->jmp
))
1111 Lisp_Object val
= (*func
) (arg
);
1112 clobbered_eassert (handlerlist
== c
);
1113 handlerlist
= handlerlist
->next
;
1117 { /* Throw works by a longjmp that comes right here. */
1118 Lisp_Object val
= handlerlist
->val
;
1119 clobbered_eassert (handlerlist
== c
);
1120 handlerlist
= handlerlist
->next
;
1125 /* Unwind the specbind, catch, and handler stacks back to CATCH, and
1126 jump to that CATCH, returning VALUE as the value of that catch.
1128 This is the guts of Fthrow and Fsignal; they differ only in the way
1129 they choose the catch tag to throw to. A catch tag for a
1130 condition-case form has a TAG of Qnil.
1132 Before each catch is discarded, unbind all special bindings and
1133 execute all unwind-protect clauses made above that catch. Unwind
1134 the handler stack as we go, so that the proper handlers are in
1135 effect for each unwind-protect clause we run. At the end, restore
1136 some static info saved in CATCH, and longjmp to the location
1139 This is used for correct unwinding in Fthrow and Fsignal. */
1141 static _Noreturn
void
1142 unwind_to_catch (struct handler
*catch, Lisp_Object value
)
1146 eassert (catch->next
);
1148 /* Save the value in the tag. */
1151 /* Restore certain special C variables. */
1152 set_poll_suppress_count (catch->poll_suppress_count
);
1153 unblock_input_to (catch->interrupt_input_blocked
);
1158 /* Unwind the specpdl stack, and then restore the proper set of
1160 unbind_to (handlerlist
->pdlcount
, Qnil
);
1161 last_time
= handlerlist
== catch;
1163 handlerlist
= handlerlist
->next
;
1165 while (! last_time
);
1167 eassert (handlerlist
== catch);
1169 byte_stack_list
= catch->byte_stack
;
1170 gcprolist
= catch->gcpro
;
1172 gcpro_level
= gcprolist
? gcprolist
->level
+ 1 : 0;
1174 lisp_eval_depth
= catch->lisp_eval_depth
;
1176 sys_longjmp (catch->jmp
, 1);
1179 DEFUN ("throw", Fthrow
, Sthrow
, 2, 2, 0,
1180 doc
: /* Throw to the catch for TAG and return VALUE from it.
1181 Both TAG and VALUE are evalled. */)
1182 (register Lisp_Object tag
, Lisp_Object value
)
1187 for (c
= handlerlist
; c
; c
= c
->next
)
1189 if (c
->type
== CATCHER
&& EQ (c
->tag_or_ch
, tag
))
1190 unwind_to_catch (c
, value
);
1192 xsignal2 (Qno_catch
, tag
, value
);
1196 DEFUN ("unwind-protect", Funwind_protect
, Sunwind_protect
, 1, UNEVALLED
, 0,
1197 doc
: /* Do BODYFORM, protecting with UNWINDFORMS.
1198 If BODYFORM completes normally, its value is returned
1199 after executing the UNWINDFORMS.
1200 If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.
1201 usage: (unwind-protect BODYFORM UNWINDFORMS...) */)
1205 ptrdiff_t count
= SPECPDL_INDEX ();
1207 record_unwind_protect (unwind_body
, XCDR (args
));
1208 val
= eval_sub (XCAR (args
));
1209 return unbind_to (count
, val
);
1212 DEFUN ("condition-case", Fcondition_case
, Scondition_case
, 2, UNEVALLED
, 0,
1213 doc
: /* Regain control when an error is signaled.
1214 Executes BODYFORM and returns its value if no error happens.
1215 Each element of HANDLERS looks like (CONDITION-NAME BODY...)
1216 where the BODY is made of Lisp expressions.
1218 A handler is applicable to an error
1219 if CONDITION-NAME is one of the error's condition names.
1220 If an error happens, the first applicable handler is run.
1222 The car of a handler may be a list of condition names instead of a
1223 single condition name; then it handles all of them. If the special
1224 condition name `debug' is present in this list, it allows another
1225 condition in the list to run the debugger if `debug-on-error' and the
1226 other usual mechanisms says it should (otherwise, `condition-case'
1227 suppresses the debugger).
1229 When a handler handles an error, control returns to the `condition-case'
1230 and it executes the handler's BODY...
1231 with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error.
1232 \(If VAR is nil, the handler can't access that information.)
1233 Then the value of the last BODY form is returned from the `condition-case'
1236 See also the function `signal' for more info.
1237 usage: (condition-case VAR BODYFORM &rest HANDLERS) */)
1240 Lisp_Object var
= XCAR (args
);
1241 Lisp_Object bodyform
= XCAR (XCDR (args
));
1242 Lisp_Object handlers
= XCDR (XCDR (args
));
1244 return internal_lisp_condition_case (var
, bodyform
, handlers
);
1247 /* Like Fcondition_case, but the args are separate
1248 rather than passed in a list. Used by Fbyte_code. */
1251 internal_lisp_condition_case (volatile Lisp_Object var
, Lisp_Object bodyform
,
1252 Lisp_Object handlers
)
1256 struct handler
*oldhandlerlist
= handlerlist
;
1261 for (val
= handlers
; CONSP (val
); val
= XCDR (val
))
1263 Lisp_Object tem
= XCAR (val
);
1267 && (SYMBOLP (XCAR (tem
))
1268 || CONSP (XCAR (tem
))))))
1269 error ("Invalid condition handler: %s",
1270 SDATA (Fprin1_to_string (tem
, Qt
)));
1273 { /* The first clause is the one that should be checked first, so it should
1274 be added to handlerlist last. So we build in `clauses' a table that
1275 contains `handlers' but in reverse order. */
1276 Lisp_Object
*clauses
= alloca (clausenb
* sizeof (Lisp_Object
*));
1277 Lisp_Object
*volatile clauses_volatile
= clauses
;
1279 for (val
= handlers
; CONSP (val
); val
= XCDR (val
))
1280 clauses
[--i
] = XCAR (val
);
1281 for (i
= 0; i
< clausenb
; i
++)
1283 Lisp_Object clause
= clauses
[i
];
1284 Lisp_Object condition
= XCAR (clause
);
1285 if (!CONSP (condition
))
1286 condition
= Fcons (condition
, Qnil
);
1287 PUSH_HANDLER (c
, condition
, CONDITION_CASE
);
1288 if (sys_setjmp (c
->jmp
))
1290 ptrdiff_t count
= SPECPDL_INDEX ();
1291 Lisp_Object val
= handlerlist
->val
;
1292 Lisp_Object
*chosen_clause
= clauses_volatile
;
1293 for (c
= handlerlist
->next
; c
!= oldhandlerlist
; c
= c
->next
)
1295 handlerlist
= oldhandlerlist
;
1298 if (!NILP (Vinternal_interpreter_environment
))
1299 specbind (Qinternal_interpreter_environment
,
1300 Fcons (Fcons (var
, val
),
1301 Vinternal_interpreter_environment
));
1303 specbind (var
, val
);
1305 val
= Fprogn (XCDR (*chosen_clause
));
1306 /* Note that this just undoes the binding of var; whoever
1307 longjumped to us unwound the stack to c.pdlcount before
1310 unbind_to (count
, Qnil
);
1316 val
= eval_sub (bodyform
);
1317 handlerlist
= oldhandlerlist
;
1321 /* Call the function BFUN with no arguments, catching errors within it
1322 according to HANDLERS. If there is an error, call HFUN with
1323 one argument which is the data that describes the error:
1326 HANDLERS can be a list of conditions to catch.
1327 If HANDLERS is Qt, catch all errors.
1328 If HANDLERS is Qerror, catch all errors
1329 but allow the debugger to run if that is enabled. */
1332 internal_condition_case (Lisp_Object (*bfun
) (void), Lisp_Object handlers
,
1333 Lisp_Object (*hfun
) (Lisp_Object
))
1338 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1339 if (sys_setjmp (c
->jmp
))
1341 Lisp_Object val
= handlerlist
->val
;
1342 clobbered_eassert (handlerlist
== c
);
1343 handlerlist
= handlerlist
->next
;
1344 return (*hfun
) (val
);
1348 clobbered_eassert (handlerlist
== c
);
1349 handlerlist
= handlerlist
->next
;
1353 /* Like internal_condition_case but call BFUN with ARG as its argument. */
1356 internal_condition_case_1 (Lisp_Object (*bfun
) (Lisp_Object
), Lisp_Object arg
,
1357 Lisp_Object handlers
, Lisp_Object (*hfun
) (Lisp_Object
))
1362 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1363 if (sys_setjmp (c
->jmp
))
1365 Lisp_Object val
= handlerlist
->val
;
1366 clobbered_eassert (handlerlist
== c
);
1367 handlerlist
= handlerlist
->next
;
1368 return (*hfun
) (val
);
1371 val
= (*bfun
) (arg
);
1372 clobbered_eassert (handlerlist
== c
);
1373 handlerlist
= handlerlist
->next
;
1377 /* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as
1381 internal_condition_case_2 (Lisp_Object (*bfun
) (Lisp_Object
, Lisp_Object
),
1384 Lisp_Object handlers
,
1385 Lisp_Object (*hfun
) (Lisp_Object
))
1390 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1391 if (sys_setjmp (c
->jmp
))
1393 Lisp_Object val
= handlerlist
->val
;
1394 clobbered_eassert (handlerlist
== c
);
1395 handlerlist
= handlerlist
->next
;
1396 return (*hfun
) (val
);
1399 val
= (*bfun
) (arg1
, arg2
);
1400 clobbered_eassert (handlerlist
== c
);
1401 handlerlist
= handlerlist
->next
;
1405 /* Like internal_condition_case but call BFUN with NARGS as first,
1406 and ARGS as second argument. */
1409 internal_condition_case_n (Lisp_Object (*bfun
) (ptrdiff_t, Lisp_Object
*),
1412 Lisp_Object handlers
,
1413 Lisp_Object (*hfun
) (Lisp_Object err
,
1420 PUSH_HANDLER (c
, handlers
, CONDITION_CASE
);
1421 if (sys_setjmp (c
->jmp
))
1423 Lisp_Object val
= handlerlist
->val
;
1424 clobbered_eassert (handlerlist
== c
);
1425 handlerlist
= handlerlist
->next
;
1426 return (*hfun
) (val
, nargs
, args
);
1429 val
= (*bfun
) (nargs
, args
);
1430 clobbered_eassert (handlerlist
== c
);
1431 handlerlist
= handlerlist
->next
;
1436 static Lisp_Object
find_handler_clause (Lisp_Object
, Lisp_Object
);
1437 static bool maybe_call_debugger (Lisp_Object conditions
, Lisp_Object sig
,
1441 process_quit_flag (void)
1443 Lisp_Object flag
= Vquit_flag
;
1445 if (EQ (flag
, Qkill_emacs
))
1447 if (EQ (Vthrow_on_input
, flag
))
1448 Fthrow (Vthrow_on_input
, Qt
);
1449 Fsignal (Qquit
, Qnil
);
1452 DEFUN ("signal", Fsignal
, Ssignal
, 2, 2, 0,
1453 doc
: /* Signal an error. Args are ERROR-SYMBOL and associated DATA.
1454 This function does not return.
1456 An error symbol is a symbol with an `error-conditions' property
1457 that is a list of condition names.
1458 A handler for any of those names will get to handle this signal.
1459 The symbol `error' should normally be one of them.
1461 DATA should be a list. Its elements are printed as part of the error message.
1462 See Info anchor `(elisp)Definition of signal' for some details on how this
1463 error message is constructed.
1464 If the signal is handled, DATA is made available to the handler.
1465 See also the function `condition-case'. */)
1466 (Lisp_Object error_symbol
, Lisp_Object data
)
1468 /* When memory is full, ERROR-SYMBOL is nil,
1469 and DATA is (REAL-ERROR-SYMBOL . REAL-DATA).
1470 That is a special case--don't do this in other situations. */
1471 Lisp_Object conditions
;
1473 Lisp_Object real_error_symbol
1474 = (NILP (error_symbol
) ? Fcar (data
) : error_symbol
);
1475 register Lisp_Object clause
= Qnil
;
1480 if (gc_in_progress
|| waiting_for_input
)
1483 #if 0 /* rms: I don't know why this was here,
1484 but it is surely wrong for an error that is handled. */
1485 #ifdef HAVE_WINDOW_SYSTEM
1486 if (display_hourglass_p
)
1487 cancel_hourglass ();
1491 /* This hook is used by edebug. */
1492 if (! NILP (Vsignal_hook_function
)
1493 && ! NILP (error_symbol
))
1495 /* Edebug takes care of restoring these variables when it exits. */
1496 if (lisp_eval_depth
+ 20 > max_lisp_eval_depth
)
1497 max_lisp_eval_depth
= lisp_eval_depth
+ 20;
1499 if (SPECPDL_INDEX () + 40 > max_specpdl_size
)
1500 max_specpdl_size
= SPECPDL_INDEX () + 40;
1502 call2 (Vsignal_hook_function
, error_symbol
, data
);
1505 conditions
= Fget (real_error_symbol
, Qerror_conditions
);
1507 /* Remember from where signal was called. Skip over the frame for
1508 `signal' itself. If a frame for `error' follows, skip that,
1509 too. Don't do this when ERROR_SYMBOL is nil, because that
1510 is a memory-full error. */
1511 Vsignaling_function
= Qnil
;
1512 if (!NILP (error_symbol
))
1514 union specbinding
*pdl
= backtrace_next (backtrace_top ());
1515 if (backtrace_p (pdl
) && EQ (backtrace_function (pdl
), Qerror
))
1516 pdl
= backtrace_next (pdl
);
1517 if (backtrace_p (pdl
))
1518 Vsignaling_function
= backtrace_function (pdl
);
1521 for (h
= handlerlist
; h
; h
= h
->next
)
1523 if (h
->type
!= CONDITION_CASE
)
1525 clause
= find_handler_clause (h
->tag_or_ch
, conditions
);
1530 if (/* Don't run the debugger for a memory-full error.
1531 (There is no room in memory to do that!) */
1532 !NILP (error_symbol
)
1533 && (!NILP (Vdebug_on_signal
)
1534 /* If no handler is present now, try to run the debugger. */
1536 /* A `debug' symbol in the handler list disables the normal
1537 suppression of the debugger. */
1538 || (CONSP (clause
) && CONSP (clause
)
1539 && !NILP (Fmemq (Qdebug
, clause
)))
1540 /* Special handler that means "print a message and run debugger
1542 || EQ (h
->tag_or_ch
, Qerror
)))
1544 bool debugger_called
1545 = maybe_call_debugger (conditions
, error_symbol
, data
);
1546 /* We can't return values to code which signaled an error, but we
1547 can continue code which has signaled a quit. */
1548 if (debugger_called
&& EQ (real_error_symbol
, Qquit
))
1554 Lisp_Object unwind_data
1555 = (NILP (error_symbol
) ? data
: Fcons (error_symbol
, data
));
1557 unwind_to_catch (h
, unwind_data
);
1561 if (handlerlist
!= &handlerlist_sentinel
)
1562 /* FIXME: This will come right back here if there's no `top-level'
1563 catcher. A better solution would be to abort here, and instead
1564 add a catch-all condition handler so we never come here. */
1565 Fthrow (Qtop_level
, Qt
);
1568 if (! NILP (error_symbol
))
1569 data
= Fcons (error_symbol
, data
);
1571 string
= Ferror_message_string (data
);
1572 fatal ("%s", SDATA (string
));
1575 /* Internal version of Fsignal that never returns.
1576 Used for anything but Qquit (which can return from Fsignal). */
1579 xsignal (Lisp_Object error_symbol
, Lisp_Object data
)
1581 Fsignal (error_symbol
, data
);
1585 /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */
1588 xsignal0 (Lisp_Object error_symbol
)
1590 xsignal (error_symbol
, Qnil
);
1594 xsignal1 (Lisp_Object error_symbol
, Lisp_Object arg
)
1596 xsignal (error_symbol
, list1 (arg
));
1600 xsignal2 (Lisp_Object error_symbol
, Lisp_Object arg1
, Lisp_Object arg2
)
1602 xsignal (error_symbol
, list2 (arg1
, arg2
));
1606 xsignal3 (Lisp_Object error_symbol
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
)
1608 xsignal (error_symbol
, list3 (arg1
, arg2
, arg3
));
1611 /* Signal `error' with message S, and additional arg ARG.
1612 If ARG is not a genuine list, make it a one-element list. */
1615 signal_error (const char *s
, Lisp_Object arg
)
1617 Lisp_Object tortoise
, hare
;
1619 hare
= tortoise
= arg
;
1620 while (CONSP (hare
))
1627 tortoise
= XCDR (tortoise
);
1629 if (EQ (hare
, tortoise
))
1636 xsignal (Qerror
, Fcons (build_string (s
), arg
));
1640 /* Return true if LIST is a non-nil atom or
1641 a list containing one of CONDITIONS. */
1644 wants_debugger (Lisp_Object list
, Lisp_Object conditions
)
1651 while (CONSP (conditions
))
1653 Lisp_Object
this, tail
;
1654 this = XCAR (conditions
);
1655 for (tail
= list
; CONSP (tail
); tail
= XCDR (tail
))
1656 if (EQ (XCAR (tail
), this))
1658 conditions
= XCDR (conditions
);
1663 /* Return true if an error with condition-symbols CONDITIONS,
1664 and described by SIGNAL-DATA, should skip the debugger
1665 according to debugger-ignored-errors. */
1668 skip_debugger (Lisp_Object conditions
, Lisp_Object data
)
1671 bool first_string
= 1;
1672 Lisp_Object error_message
;
1674 error_message
= Qnil
;
1675 for (tail
= Vdebug_ignored_errors
; CONSP (tail
); tail
= XCDR (tail
))
1677 if (STRINGP (XCAR (tail
)))
1681 error_message
= Ferror_message_string (data
);
1685 if (fast_string_match (XCAR (tail
), error_message
) >= 0)
1690 Lisp_Object contail
;
1692 for (contail
= conditions
; CONSP (contail
); contail
= XCDR (contail
))
1693 if (EQ (XCAR (tail
), XCAR (contail
)))
1701 /* Call the debugger if calling it is currently enabled for CONDITIONS.
1702 SIG and DATA describe the signal. There are two ways to pass them:
1703 = SIG is the error symbol, and DATA is the rest of the data.
1704 = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
1705 This is for memory-full errors only. */
1707 maybe_call_debugger (Lisp_Object conditions
, Lisp_Object sig
, Lisp_Object data
)
1709 Lisp_Object combined_data
;
1711 combined_data
= Fcons (sig
, data
);
1714 /* Don't try to run the debugger with interrupts blocked.
1715 The editing loop would return anyway. */
1716 ! input_blocked_p ()
1717 && NILP (Vinhibit_debugger
)
1718 /* Does user want to enter debugger for this kind of error? */
1721 : wants_debugger (Vdebug_on_error
, conditions
))
1722 && ! skip_debugger (conditions
, combined_data
)
1723 /* RMS: What's this for? */
1724 && when_entered_debugger
< num_nonmacro_input_events
)
1726 call_debugger (list2 (Qerror
, combined_data
));
1734 find_handler_clause (Lisp_Object handlers
, Lisp_Object conditions
)
1736 register Lisp_Object h
;
1738 /* t is used by handlers for all conditions, set up by C code. */
1739 if (EQ (handlers
, Qt
))
1742 /* error is used similarly, but means print an error message
1743 and run the debugger if that is enabled. */
1744 if (EQ (handlers
, Qerror
))
1747 for (h
= handlers
; CONSP (h
); h
= XCDR (h
))
1749 Lisp_Object handler
= XCAR (h
);
1750 if (!NILP (Fmemq (handler
, conditions
)))
1758 /* Dump an error message; called like vprintf. */
1760 verror (const char *m
, va_list ap
)
1763 ptrdiff_t size
= sizeof buf
;
1764 ptrdiff_t size_max
= STRING_BYTES_BOUND
+ 1;
1769 used
= evxprintf (&buffer
, &size
, buf
, size_max
, m
, ap
);
1770 string
= make_string (buffer
, used
);
1774 xsignal1 (Qerror
, string
);
1778 /* Dump an error message; called like printf. */
1782 error (const char *m
, ...)
1789 DEFUN ("commandp", Fcommandp
, Scommandp
, 1, 2, 0,
1790 doc
: /* Non-nil if FUNCTION makes provisions for interactive calling.
1791 This means it contains a description for how to read arguments to give it.
1792 The value is nil for an invalid function or a symbol with no function
1795 Interactively callable functions include strings and vectors (treated
1796 as keyboard macros), lambda-expressions that contain a top-level call
1797 to `interactive', autoload definitions made by `autoload' with non-nil
1798 fourth argument, and some of the built-in functions of Lisp.
1800 Also, a symbol satisfies `commandp' if its function definition does so.
1802 If the optional argument FOR-CALL-INTERACTIVELY is non-nil,
1803 then strings and vectors are not accepted. */)
1804 (Lisp_Object function
, Lisp_Object for_call_interactively
)
1806 register Lisp_Object fun
;
1807 register Lisp_Object funcar
;
1808 Lisp_Object if_prop
= Qnil
;
1812 fun
= indirect_function (fun
); /* Check cycles. */
1816 /* Check an `interactive-form' property if present, analogous to the
1817 function-documentation property. */
1819 while (SYMBOLP (fun
))
1821 Lisp_Object tmp
= Fget (fun
, Qinteractive_form
);
1824 fun
= Fsymbol_function (fun
);
1827 /* Emacs primitives are interactive if their DEFUN specifies an
1828 interactive spec. */
1830 return XSUBR (fun
)->intspec
? Qt
: if_prop
;
1832 /* Bytecode objects are interactive if they are long enough to
1833 have an element whose index is COMPILED_INTERACTIVE, which is
1834 where the interactive spec is stored. */
1835 else if (COMPILEDP (fun
))
1836 return ((ASIZE (fun
) & PSEUDOVECTOR_SIZE_MASK
) > COMPILED_INTERACTIVE
1839 /* Strings and vectors are keyboard macros. */
1840 if (STRINGP (fun
) || VECTORP (fun
))
1841 return (NILP (for_call_interactively
) ? Qt
: Qnil
);
1843 /* Lists may represent commands. */
1846 funcar
= XCAR (fun
);
1847 if (EQ (funcar
, Qclosure
))
1848 return (!NILP (Fassq (Qinteractive
, Fcdr (Fcdr (XCDR (fun
)))))
1850 else if (EQ (funcar
, Qlambda
))
1851 return !NILP (Fassq (Qinteractive
, Fcdr (XCDR (fun
)))) ? Qt
: if_prop
;
1852 else if (EQ (funcar
, Qautoload
))
1853 return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun
))))) ? Qt
: if_prop
;
1858 DEFUN ("autoload", Fautoload
, Sautoload
, 2, 5, 0,
1859 doc
: /* Define FUNCTION to autoload from FILE.
1860 FUNCTION is a symbol; FILE is a file name string to pass to `load'.
1861 Third arg DOCSTRING is documentation for the function.
1862 Fourth arg INTERACTIVE if non-nil says function can be called interactively.
1863 Fifth arg TYPE indicates the type of the object:
1864 nil or omitted says FUNCTION is a function,
1865 `keymap' says FUNCTION is really a keymap, and
1866 `macro' or t says FUNCTION is really a macro.
1867 Third through fifth args give info about the real definition.
1868 They default to nil.
1869 If FUNCTION is already defined other than as an autoload,
1870 this does nothing and returns nil. */)
1871 (Lisp_Object function
, Lisp_Object file
, Lisp_Object docstring
, Lisp_Object interactive
, Lisp_Object type
)
1873 CHECK_SYMBOL (function
);
1874 CHECK_STRING (file
);
1876 /* If function is defined and not as an autoload, don't override. */
1877 if (!NILP (XSYMBOL (function
)->function
)
1878 && !AUTOLOADP (XSYMBOL (function
)->function
))
1881 if (!NILP (Vpurify_flag
) && EQ (docstring
, make_number (0)))
1882 /* `read1' in lread.c has found the docstring starting with "\
1883 and assumed the docstring will be provided by Snarf-documentation, so it
1884 passed us 0 instead. But that leads to accidental sharing in purecopy's
1885 hash-consing, so we use a (hopefully) unique integer instead. */
1886 docstring
= make_number (XHASH (function
));
1887 return Fdefalias (function
,
1888 list5 (Qautoload
, file
, docstring
, interactive
, type
),
1893 un_autoload (Lisp_Object oldqueue
)
1895 Lisp_Object queue
, first
, second
;
1897 /* Queue to unwind is current value of Vautoload_queue.
1898 oldqueue is the shadowed value to leave in Vautoload_queue. */
1899 queue
= Vautoload_queue
;
1900 Vautoload_queue
= oldqueue
;
1901 while (CONSP (queue
))
1903 first
= XCAR (queue
);
1904 second
= Fcdr (first
);
1905 first
= Fcar (first
);
1906 if (EQ (first
, make_number (0)))
1909 Ffset (first
, second
);
1910 queue
= XCDR (queue
);
1914 /* Load an autoloaded function.
1915 FUNNAME is the symbol which is the function's name.
1916 FUNDEF is the autoload definition (a list). */
1918 DEFUN ("autoload-do-load", Fautoload_do_load
, Sautoload_do_load
, 1, 3, 0,
1919 doc
: /* Load FUNDEF which should be an autoload.
1920 If non-nil, FUNNAME should be the symbol whose function value is FUNDEF,
1921 in which case the function returns the new autoloaded function value.
1922 If equal to `macro', MACRO-ONLY specifies that FUNDEF should only be loaded if
1923 it is defines a macro. */)
1924 (Lisp_Object fundef
, Lisp_Object funname
, Lisp_Object macro_only
)
1926 ptrdiff_t count
= SPECPDL_INDEX ();
1927 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1929 if (!CONSP (fundef
) || !EQ (Qautoload
, XCAR (fundef
)))
1932 if (EQ (macro_only
, Qmacro
))
1934 Lisp_Object kind
= Fnth (make_number (4), fundef
);
1935 if (! (EQ (kind
, Qt
) || EQ (kind
, Qmacro
)))
1939 /* This is to make sure that loadup.el gives a clear picture
1940 of what files are preloaded and when. */
1941 if (! NILP (Vpurify_flag
))
1942 error ("Attempt to autoload %s while preparing to dump",
1943 SDATA (SYMBOL_NAME (funname
)));
1945 CHECK_SYMBOL (funname
);
1946 GCPRO3 (funname
, fundef
, macro_only
);
1948 /* Preserve the match data. */
1949 record_unwind_save_match_data ();
1951 /* If autoloading gets an error (which includes the error of failing
1952 to define the function being called), we use Vautoload_queue
1953 to undo function definitions and `provide' calls made by
1954 the function. We do this in the specific case of autoloading
1955 because autoloading is not an explicit request "load this file",
1956 but rather a request to "call this function".
1958 The value saved here is to be restored into Vautoload_queue. */
1959 record_unwind_protect (un_autoload
, Vautoload_queue
);
1960 Vautoload_queue
= Qt
;
1961 /* If `macro_only', assume this autoload to be a "best-effort",
1962 so don't signal an error if autoloading fails. */
1963 Fload (Fcar (Fcdr (fundef
)), macro_only
, Qt
, Qnil
, Qt
);
1965 /* Once loading finishes, don't undo it. */
1966 Vautoload_queue
= Qt
;
1967 unbind_to (count
, Qnil
);
1975 Lisp_Object fun
= Findirect_function (funname
, Qnil
);
1977 if (!NILP (Fequal (fun
, fundef
)))
1978 error ("Autoloading failed to define function %s",
1979 SDATA (SYMBOL_NAME (funname
)));
1986 DEFUN ("eval", Feval
, Seval
, 1, 2, 0,
1987 doc
: /* Evaluate FORM and return its value.
1988 If LEXICAL is t, evaluate using lexical scoping.
1989 LEXICAL can also be an actual lexical environment, in the form of an
1990 alist mapping symbols to their value. */)
1991 (Lisp_Object form
, Lisp_Object lexical
)
1993 ptrdiff_t count
= SPECPDL_INDEX ();
1994 specbind (Qinternal_interpreter_environment
,
1995 CONSP (lexical
) || NILP (lexical
) ? lexical
: list1 (Qt
));
1996 return unbind_to (count
, eval_sub (form
));
1999 /* Grow the specpdl stack by one entry.
2000 The caller should have already initialized the entry.
2001 Signal an error on stack overflow.
2003 Make sure that there is always one unused entry past the top of the
2004 stack, so that the just-initialized entry is safely unwound if
2005 memory exhausted and an error is signaled here. Also, allocate a
2006 never-used entry just before the bottom of the stack; sometimes its
2007 address is taken. */
2014 if (specpdl_ptr
== specpdl
+ specpdl_size
)
2016 ptrdiff_t count
= SPECPDL_INDEX ();
2017 ptrdiff_t max_size
= min (max_specpdl_size
, PTRDIFF_MAX
- 1000);
2018 union specbinding
*pdlvec
= specpdl
- 1;
2019 ptrdiff_t pdlvecsize
= specpdl_size
+ 1;
2020 if (max_size
<= specpdl_size
)
2022 if (max_specpdl_size
< 400)
2023 max_size
= max_specpdl_size
= 400;
2024 if (max_size
<= specpdl_size
)
2025 signal_error ("Variable binding depth exceeds max-specpdl-size",
2028 pdlvec
= xpalloc (pdlvec
, &pdlvecsize
, 1, max_size
+ 1, sizeof *specpdl
);
2029 specpdl
= pdlvec
+ 1;
2030 specpdl_size
= pdlvecsize
- 1;
2031 specpdl_ptr
= specpdl
+ count
;
2036 record_in_backtrace (Lisp_Object function
, Lisp_Object
*args
, ptrdiff_t nargs
)
2038 eassert (nargs
>= UNEVALLED
);
2039 specpdl_ptr
->bt
.kind
= SPECPDL_BACKTRACE
;
2040 specpdl_ptr
->bt
.debug_on_exit
= false;
2041 specpdl_ptr
->bt
.function
= function
;
2042 specpdl_ptr
->bt
.args
= args
;
2043 specpdl_ptr
->bt
.nargs
= nargs
;
2047 /* Eval a sub-expression of the current expression (i.e. in the same
2050 eval_sub (Lisp_Object form
)
2052 Lisp_Object fun
, val
, original_fun
, original_args
;
2054 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2058 /* Look up its binding in the lexical environment.
2059 We do not pay attention to the declared_special flag here, since we
2060 already did that when let-binding the variable. */
2061 Lisp_Object lex_binding
2062 = !NILP (Vinternal_interpreter_environment
) /* Mere optimization! */
2063 ? Fassq (form
, Vinternal_interpreter_environment
)
2065 if (CONSP (lex_binding
))
2066 return XCDR (lex_binding
);
2068 return Fsymbol_value (form
);
2080 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2082 if (max_lisp_eval_depth
< 100)
2083 max_lisp_eval_depth
= 100;
2084 if (lisp_eval_depth
> max_lisp_eval_depth
)
2085 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2088 original_fun
= XCAR (form
);
2089 original_args
= XCDR (form
);
2091 /* This also protects them from gc. */
2092 record_in_backtrace (original_fun
, &original_args
, UNEVALLED
);
2094 if (debug_on_next_call
)
2095 do_debug_on_call (Qt
);
2097 /* At this point, only original_fun and original_args
2098 have values that will be used below. */
2101 /* Optimize for no indirection. */
2104 fun
= Ffunction (Fcons (fun
, Qnil
));
2105 else if (!NILP (fun
) && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2106 fun
= indirect_function (fun
);
2110 Lisp_Object numargs
;
2111 Lisp_Object argvals
[8];
2112 Lisp_Object args_left
;
2113 register int i
, maxargs
;
2115 args_left
= original_args
;
2116 numargs
= Flength (args_left
);
2120 if (XINT (numargs
) < XSUBR (fun
)->min_args
2121 || (XSUBR (fun
)->max_args
>= 0
2122 && XSUBR (fun
)->max_args
< XINT (numargs
)))
2123 xsignal2 (Qwrong_number_of_arguments
, original_fun
, numargs
);
2125 else if (XSUBR (fun
)->max_args
== UNEVALLED
)
2126 val
= (XSUBR (fun
)->function
.aUNEVALLED
) (args_left
);
2127 else if (XSUBR (fun
)->max_args
== MANY
)
2129 /* Pass a vector of evaluated arguments. */
2131 ptrdiff_t argnum
= 0;
2134 SAFE_ALLOCA_LISP (vals
, XINT (numargs
));
2136 GCPRO3 (args_left
, fun
, fun
);
2140 while (!NILP (args_left
))
2142 vals
[argnum
++] = eval_sub (Fcar (args_left
));
2143 args_left
= Fcdr (args_left
);
2144 gcpro3
.nvars
= argnum
;
2147 set_backtrace_args (specpdl_ptr
- 1, vals
);
2148 set_backtrace_nargs (specpdl_ptr
- 1, XINT (numargs
));
2150 val
= (XSUBR (fun
)->function
.aMANY
) (XINT (numargs
), vals
);
2156 GCPRO3 (args_left
, fun
, fun
);
2157 gcpro3
.var
= argvals
;
2160 maxargs
= XSUBR (fun
)->max_args
;
2161 for (i
= 0; i
< maxargs
; args_left
= Fcdr (args_left
))
2163 argvals
[i
] = eval_sub (Fcar (args_left
));
2169 set_backtrace_args (specpdl_ptr
- 1, argvals
);
2170 set_backtrace_nargs (specpdl_ptr
- 1, XINT (numargs
));
2175 val
= (XSUBR (fun
)->function
.a0 ());
2178 val
= (XSUBR (fun
)->function
.a1 (argvals
[0]));
2181 val
= (XSUBR (fun
)->function
.a2 (argvals
[0], argvals
[1]));
2184 val
= (XSUBR (fun
)->function
.a3
2185 (argvals
[0], argvals
[1], argvals
[2]));
2188 val
= (XSUBR (fun
)->function
.a4
2189 (argvals
[0], argvals
[1], argvals
[2], argvals
[3]));
2192 val
= (XSUBR (fun
)->function
.a5
2193 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2197 val
= (XSUBR (fun
)->function
.a6
2198 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2199 argvals
[4], argvals
[5]));
2202 val
= (XSUBR (fun
)->function
.a7
2203 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2204 argvals
[4], argvals
[5], argvals
[6]));
2208 val
= (XSUBR (fun
)->function
.a8
2209 (argvals
[0], argvals
[1], argvals
[2], argvals
[3],
2210 argvals
[4], argvals
[5], argvals
[6], argvals
[7]));
2214 /* Someone has created a subr that takes more arguments than
2215 is supported by this code. We need to either rewrite the
2216 subr to use a different argument protocol, or add more
2217 cases to this switch. */
2222 else if (COMPILEDP (fun
))
2223 val
= apply_lambda (fun
, original_args
);
2227 xsignal1 (Qvoid_function
, original_fun
);
2229 xsignal1 (Qinvalid_function
, original_fun
);
2230 funcar
= XCAR (fun
);
2231 if (!SYMBOLP (funcar
))
2232 xsignal1 (Qinvalid_function
, original_fun
);
2233 if (EQ (funcar
, Qautoload
))
2235 Fautoload_do_load (fun
, original_fun
, Qnil
);
2238 if (EQ (funcar
, Qmacro
))
2240 ptrdiff_t count
= SPECPDL_INDEX ();
2242 /* Bind lexical-binding during expansion of the macro, so the
2243 macro can know reliably if the code it outputs will be
2244 interpreted using lexical-binding or not. */
2245 specbind (Qlexical_binding
,
2246 NILP (Vinternal_interpreter_environment
) ? Qnil
: Qt
);
2247 exp
= apply1 (Fcdr (fun
), original_args
);
2248 unbind_to (count
, Qnil
);
2249 val
= eval_sub (exp
);
2251 else if (EQ (funcar
, Qlambda
)
2252 || EQ (funcar
, Qclosure
))
2253 val
= apply_lambda (fun
, original_args
);
2255 xsignal1 (Qinvalid_function
, original_fun
);
2260 if (backtrace_debug_on_exit (specpdl_ptr
- 1))
2261 val
= call_debugger (list2 (Qexit
, val
));
2267 DEFUN ("apply", Fapply
, Sapply
, 1, MANY
, 0,
2268 doc
: /* Call FUNCTION with our remaining args, using our last arg as list of args.
2269 Then return the value FUNCTION returns.
2270 Thus, (apply '+ 1 2 '(3 4)) returns 10.
2271 usage: (apply FUNCTION &rest ARGUMENTS) */)
2272 (ptrdiff_t nargs
, Lisp_Object
*args
)
2276 register Lisp_Object spread_arg
;
2277 register Lisp_Object
*funcall_args
;
2278 Lisp_Object fun
, retval
;
2279 struct gcpro gcpro1
;
2284 spread_arg
= args
[nargs
- 1];
2285 CHECK_LIST (spread_arg
);
2287 numargs
= XINT (Flength (spread_arg
));
2290 return Ffuncall (nargs
- 1, args
);
2291 else if (numargs
== 1)
2293 args
[nargs
- 1] = XCAR (spread_arg
);
2294 return Ffuncall (nargs
, args
);
2297 numargs
+= nargs
- 2;
2299 /* Optimize for no indirection. */
2300 if (SYMBOLP (fun
) && !NILP (fun
)
2301 && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2302 fun
= indirect_function (fun
);
2305 /* Let funcall get the error. */
2312 if (numargs
< XSUBR (fun
)->min_args
2313 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2314 goto funcall
; /* Let funcall get the error. */
2315 else if (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
> numargs
)
2317 /* Avoid making funcall cons up a yet another new vector of arguments
2318 by explicitly supplying nil's for optional values. */
2319 SAFE_ALLOCA_LISP (funcall_args
, 1 + XSUBR (fun
)->max_args
);
2320 for (i
= numargs
; i
< XSUBR (fun
)->max_args
;)
2321 funcall_args
[++i
] = Qnil
;
2322 GCPRO1 (*funcall_args
);
2323 gcpro1
.nvars
= 1 + XSUBR (fun
)->max_args
;
2327 /* We add 1 to numargs because funcall_args includes the
2328 function itself as well as its arguments. */
2331 SAFE_ALLOCA_LISP (funcall_args
, 1 + numargs
);
2332 GCPRO1 (*funcall_args
);
2333 gcpro1
.nvars
= 1 + numargs
;
2336 memcpy (funcall_args
, args
, nargs
* word_size
);
2337 /* Spread the last arg we got. Its first element goes in
2338 the slot that it used to occupy, hence this value of I. */
2340 while (!NILP (spread_arg
))
2342 funcall_args
[i
++] = XCAR (spread_arg
);
2343 spread_arg
= XCDR (spread_arg
);
2346 /* By convention, the caller needs to gcpro Ffuncall's args. */
2347 retval
= Ffuncall (gcpro1
.nvars
, funcall_args
);
2354 /* Run hook variables in various ways. */
2357 funcall_nil (ptrdiff_t nargs
, Lisp_Object
*args
)
2359 Ffuncall (nargs
, args
);
2363 DEFUN ("run-hooks", Frun_hooks
, Srun_hooks
, 0, MANY
, 0,
2364 doc
: /* Run each hook in HOOKS.
2365 Each argument should be a symbol, a hook variable.
2366 These symbols are processed in the order specified.
2367 If a hook symbol has a non-nil value, that value may be a function
2368 or a list of functions to be called to run the hook.
2369 If the value is a function, it is called with no arguments.
2370 If it is a list, the elements are called, in order, with no arguments.
2372 Major modes should not use this function directly to run their mode
2373 hook; they should use `run-mode-hooks' instead.
2375 Do not use `make-local-variable' to make a hook variable buffer-local.
2376 Instead, use `add-hook' and specify t for the LOCAL argument.
2377 usage: (run-hooks &rest HOOKS) */)
2378 (ptrdiff_t nargs
, Lisp_Object
*args
)
2380 Lisp_Object hook
[1];
2383 for (i
= 0; i
< nargs
; i
++)
2386 run_hook_with_args (1, hook
, funcall_nil
);
2392 DEFUN ("run-hook-with-args", Frun_hook_with_args
,
2393 Srun_hook_with_args
, 1, MANY
, 0,
2394 doc
: /* Run HOOK with the specified arguments ARGS.
2395 HOOK should be a symbol, a hook variable. The value of HOOK
2396 may be nil, a function, or a list of functions. Call each
2397 function in order with arguments ARGS. The final return value
2400 Do not use `make-local-variable' to make a hook variable buffer-local.
2401 Instead, use `add-hook' and specify t for the LOCAL argument.
2402 usage: (run-hook-with-args HOOK &rest ARGS) */)
2403 (ptrdiff_t nargs
, Lisp_Object
*args
)
2405 return run_hook_with_args (nargs
, args
, funcall_nil
);
2408 /* NB this one still documents a specific non-nil return value.
2409 (As did run-hook-with-args and run-hook-with-args-until-failure
2410 until they were changed in 24.1.) */
2411 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success
,
2412 Srun_hook_with_args_until_success
, 1, MANY
, 0,
2413 doc
: /* Run HOOK with the specified arguments ARGS.
2414 HOOK should be a symbol, a hook variable. The value of HOOK
2415 may be nil, a function, or a list of functions. Call each
2416 function in order with arguments ARGS, stopping at the first
2417 one that returns non-nil, and return that value. Otherwise (if
2418 all functions return nil, or if there are no functions to call),
2421 Do not use `make-local-variable' to make a hook variable buffer-local.
2422 Instead, use `add-hook' and specify t for the LOCAL argument.
2423 usage: (run-hook-with-args-until-success HOOK &rest ARGS) */)
2424 (ptrdiff_t nargs
, Lisp_Object
*args
)
2426 return run_hook_with_args (nargs
, args
, Ffuncall
);
2430 funcall_not (ptrdiff_t nargs
, Lisp_Object
*args
)
2432 return NILP (Ffuncall (nargs
, args
)) ? Qt
: Qnil
;
2435 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure
,
2436 Srun_hook_with_args_until_failure
, 1, MANY
, 0,
2437 doc
: /* Run HOOK with the specified arguments ARGS.
2438 HOOK should be a symbol, a hook variable. The value of HOOK
2439 may be nil, a function, or a list of functions. Call each
2440 function in order with arguments ARGS, stopping at the first
2441 one that returns nil, and return nil. Otherwise (if all functions
2442 return non-nil, or if there are no functions to call), return non-nil
2443 \(do not rely on the precise return value in this case).
2445 Do not use `make-local-variable' to make a hook variable buffer-local.
2446 Instead, use `add-hook' and specify t for the LOCAL argument.
2447 usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */)
2448 (ptrdiff_t nargs
, Lisp_Object
*args
)
2450 return NILP (run_hook_with_args (nargs
, args
, funcall_not
)) ? Qt
: Qnil
;
2454 run_hook_wrapped_funcall (ptrdiff_t nargs
, Lisp_Object
*args
)
2456 Lisp_Object tmp
= args
[0], ret
;
2459 ret
= Ffuncall (nargs
, args
);
2465 DEFUN ("run-hook-wrapped", Frun_hook_wrapped
, Srun_hook_wrapped
, 2, MANY
, 0,
2466 doc
: /* Run HOOK, passing each function through WRAP-FUNCTION.
2467 I.e. instead of calling each function FUN directly with arguments ARGS,
2468 it calls WRAP-FUNCTION with arguments FUN and ARGS.
2469 As soon as a call to WRAP-FUNCTION returns non-nil, `run-hook-wrapped'
2470 aborts and returns that value.
2471 usage: (run-hook-wrapped HOOK WRAP-FUNCTION &rest ARGS) */)
2472 (ptrdiff_t nargs
, Lisp_Object
*args
)
2474 return run_hook_with_args (nargs
, args
, run_hook_wrapped_funcall
);
2477 /* ARGS[0] should be a hook symbol.
2478 Call each of the functions in the hook value, passing each of them
2479 as arguments all the rest of ARGS (all NARGS - 1 elements).
2480 FUNCALL specifies how to call each function on the hook.
2481 The caller (or its caller, etc) must gcpro all of ARGS,
2482 except that it isn't necessary to gcpro ARGS[0]. */
2485 run_hook_with_args (ptrdiff_t nargs
, Lisp_Object
*args
,
2486 Lisp_Object (*funcall
) (ptrdiff_t nargs
, Lisp_Object
*args
))
2488 Lisp_Object sym
, val
, ret
= Qnil
;
2489 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2491 /* If we are dying or still initializing,
2492 don't do anything--it would probably crash if we tried. */
2493 if (NILP (Vrun_hooks
))
2497 val
= find_symbol_value (sym
);
2499 if (EQ (val
, Qunbound
) || NILP (val
))
2501 else if (!CONSP (val
) || FUNCTIONP (val
))
2504 return funcall (nargs
, args
);
2508 Lisp_Object global_vals
= Qnil
;
2509 GCPRO3 (sym
, val
, global_vals
);
2512 CONSP (val
) && NILP (ret
);
2515 if (EQ (XCAR (val
), Qt
))
2517 /* t indicates this hook has a local binding;
2518 it means to run the global binding too. */
2519 global_vals
= Fdefault_value (sym
);
2520 if (NILP (global_vals
)) continue;
2522 if (!CONSP (global_vals
) || EQ (XCAR (global_vals
), Qlambda
))
2524 args
[0] = global_vals
;
2525 ret
= funcall (nargs
, args
);
2530 CONSP (global_vals
) && NILP (ret
);
2531 global_vals
= XCDR (global_vals
))
2533 args
[0] = XCAR (global_vals
);
2534 /* In a global value, t should not occur. If it does, we
2535 must ignore it to avoid an endless loop. */
2536 if (!EQ (args
[0], Qt
))
2537 ret
= funcall (nargs
, args
);
2543 args
[0] = XCAR (val
);
2544 ret
= funcall (nargs
, args
);
2553 /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
2556 run_hook_with_args_2 (Lisp_Object hook
, Lisp_Object arg1
, Lisp_Object arg2
)
2558 Lisp_Object temp
[3];
2563 Frun_hook_with_args (3, temp
);
2566 /* Apply fn to arg. */
2568 apply1 (Lisp_Object fn
, Lisp_Object arg
)
2570 struct gcpro gcpro1
;
2574 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2577 Lisp_Object args
[2];
2581 RETURN_UNGCPRO (Fapply (2, args
));
2585 /* Call function fn on no arguments. */
2587 call0 (Lisp_Object fn
)
2589 struct gcpro gcpro1
;
2592 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2595 /* Call function fn with 1 argument arg1. */
2598 call1 (Lisp_Object fn
, Lisp_Object arg1
)
2600 struct gcpro gcpro1
;
2601 Lisp_Object args
[2];
2607 RETURN_UNGCPRO (Ffuncall (2, args
));
2610 /* Call function fn with 2 arguments arg1, arg2. */
2613 call2 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
)
2615 struct gcpro gcpro1
;
2616 Lisp_Object args
[3];
2622 RETURN_UNGCPRO (Ffuncall (3, args
));
2625 /* Call function fn with 3 arguments arg1, arg2, arg3. */
2628 call3 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
)
2630 struct gcpro gcpro1
;
2631 Lisp_Object args
[4];
2638 RETURN_UNGCPRO (Ffuncall (4, args
));
2641 /* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */
2644 call4 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2647 struct gcpro gcpro1
;
2648 Lisp_Object args
[5];
2656 RETURN_UNGCPRO (Ffuncall (5, args
));
2659 /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */
2662 call5 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2663 Lisp_Object arg4
, Lisp_Object arg5
)
2665 struct gcpro gcpro1
;
2666 Lisp_Object args
[6];
2675 RETURN_UNGCPRO (Ffuncall (6, args
));
2678 /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */
2681 call6 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2682 Lisp_Object arg4
, Lisp_Object arg5
, Lisp_Object arg6
)
2684 struct gcpro gcpro1
;
2685 Lisp_Object args
[7];
2695 RETURN_UNGCPRO (Ffuncall (7, args
));
2698 /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */
2701 call7 (Lisp_Object fn
, Lisp_Object arg1
, Lisp_Object arg2
, Lisp_Object arg3
,
2702 Lisp_Object arg4
, Lisp_Object arg5
, Lisp_Object arg6
, Lisp_Object arg7
)
2704 struct gcpro gcpro1
;
2705 Lisp_Object args
[8];
2716 RETURN_UNGCPRO (Ffuncall (8, args
));
2719 /* The caller should GCPRO all the elements of ARGS. */
2721 DEFUN ("functionp", Ffunctionp
, Sfunctionp
, 1, 1, 0,
2722 doc
: /* Non-nil if OBJECT is a function. */)
2723 (Lisp_Object object
)
2725 if (FUNCTIONP (object
))
2730 DEFUN ("funcall", Ffuncall
, Sfuncall
, 1, MANY
, 0,
2731 doc
: /* Call first argument as a function, passing remaining arguments to it.
2732 Return the value that function returns.
2733 Thus, (funcall 'cons 'x 'y) returns (x . y).
2734 usage: (funcall FUNCTION &rest ARGUMENTS) */)
2735 (ptrdiff_t nargs
, Lisp_Object
*args
)
2737 Lisp_Object fun
, original_fun
;
2739 ptrdiff_t numargs
= nargs
- 1;
2740 Lisp_Object lisp_numargs
;
2742 register Lisp_Object
*internal_args
;
2747 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2749 if (max_lisp_eval_depth
< 100)
2750 max_lisp_eval_depth
= 100;
2751 if (lisp_eval_depth
> max_lisp_eval_depth
)
2752 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2755 /* This also GCPROs them. */
2756 record_in_backtrace (args
[0], &args
[1], nargs
- 1);
2758 /* Call GC after setting up the backtrace, so the latter GCPROs the args. */
2761 if (debug_on_next_call
)
2762 do_debug_on_call (Qlambda
);
2766 original_fun
= args
[0];
2770 /* Optimize for no indirection. */
2772 if (SYMBOLP (fun
) && !NILP (fun
)
2773 && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2774 fun
= indirect_function (fun
);
2778 if (numargs
< XSUBR (fun
)->min_args
2779 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2781 XSETFASTINT (lisp_numargs
, numargs
);
2782 xsignal2 (Qwrong_number_of_arguments
, original_fun
, lisp_numargs
);
2785 else if (XSUBR (fun
)->max_args
== UNEVALLED
)
2786 xsignal1 (Qinvalid_function
, original_fun
);
2788 else if (XSUBR (fun
)->max_args
== MANY
)
2789 val
= (XSUBR (fun
)->function
.aMANY
) (numargs
, args
+ 1);
2792 if (XSUBR (fun
)->max_args
> numargs
)
2794 internal_args
= alloca (XSUBR (fun
)->max_args
2795 * sizeof *internal_args
);
2796 memcpy (internal_args
, args
+ 1, numargs
* word_size
);
2797 for (i
= numargs
; i
< XSUBR (fun
)->max_args
; i
++)
2798 internal_args
[i
] = Qnil
;
2801 internal_args
= args
+ 1;
2802 switch (XSUBR (fun
)->max_args
)
2805 val
= (XSUBR (fun
)->function
.a0 ());
2808 val
= (XSUBR (fun
)->function
.a1 (internal_args
[0]));
2811 val
= (XSUBR (fun
)->function
.a2
2812 (internal_args
[0], internal_args
[1]));
2815 val
= (XSUBR (fun
)->function
.a3
2816 (internal_args
[0], internal_args
[1], internal_args
[2]));
2819 val
= (XSUBR (fun
)->function
.a4
2820 (internal_args
[0], internal_args
[1], internal_args
[2],
2824 val
= (XSUBR (fun
)->function
.a5
2825 (internal_args
[0], internal_args
[1], internal_args
[2],
2826 internal_args
[3], internal_args
[4]));
2829 val
= (XSUBR (fun
)->function
.a6
2830 (internal_args
[0], internal_args
[1], internal_args
[2],
2831 internal_args
[3], internal_args
[4], internal_args
[5]));
2834 val
= (XSUBR (fun
)->function
.a7
2835 (internal_args
[0], internal_args
[1], internal_args
[2],
2836 internal_args
[3], internal_args
[4], internal_args
[5],
2841 val
= (XSUBR (fun
)->function
.a8
2842 (internal_args
[0], internal_args
[1], internal_args
[2],
2843 internal_args
[3], internal_args
[4], internal_args
[5],
2844 internal_args
[6], internal_args
[7]));
2849 /* If a subr takes more than 8 arguments without using MANY
2850 or UNEVALLED, we need to extend this function to support it.
2851 Until this is done, there is no way to call the function. */
2856 else if (COMPILEDP (fun
))
2857 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2861 xsignal1 (Qvoid_function
, original_fun
);
2863 xsignal1 (Qinvalid_function
, original_fun
);
2864 funcar
= XCAR (fun
);
2865 if (!SYMBOLP (funcar
))
2866 xsignal1 (Qinvalid_function
, original_fun
);
2867 if (EQ (funcar
, Qlambda
)
2868 || EQ (funcar
, Qclosure
))
2869 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2870 else if (EQ (funcar
, Qautoload
))
2872 Fautoload_do_load (fun
, original_fun
, Qnil
);
2877 xsignal1 (Qinvalid_function
, original_fun
);
2881 if (backtrace_debug_on_exit (specpdl_ptr
- 1))
2882 val
= call_debugger (list2 (Qexit
, val
));
2888 apply_lambda (Lisp_Object fun
, Lisp_Object args
)
2890 Lisp_Object args_left
;
2893 register Lisp_Object
*arg_vector
;
2894 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2895 register Lisp_Object tem
;
2898 numargs
= XFASTINT (Flength (args
));
2899 SAFE_ALLOCA_LISP (arg_vector
, numargs
);
2902 GCPRO3 (*arg_vector
, args_left
, fun
);
2905 for (i
= 0; i
< numargs
; )
2907 tem
= Fcar (args_left
), args_left
= Fcdr (args_left
);
2908 tem
= eval_sub (tem
);
2909 arg_vector
[i
++] = tem
;
2915 set_backtrace_args (specpdl_ptr
- 1, arg_vector
);
2916 set_backtrace_nargs (specpdl_ptr
- 1, i
);
2917 tem
= funcall_lambda (fun
, numargs
, arg_vector
);
2919 /* Do the debug-on-exit now, while arg_vector still exists. */
2920 if (backtrace_debug_on_exit (specpdl_ptr
- 1))
2922 /* Don't do it again when we return to eval. */
2923 set_backtrace_debug_on_exit (specpdl_ptr
- 1, false);
2924 tem
= call_debugger (list2 (Qexit
, tem
));
2930 /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
2931 and return the result of evaluation.
2932 FUN must be either a lambda-expression or a compiled-code object. */
2935 funcall_lambda (Lisp_Object fun
, ptrdiff_t nargs
,
2936 register Lisp_Object
*arg_vector
)
2938 Lisp_Object val
, syms_left
, next
, lexenv
;
2939 ptrdiff_t count
= SPECPDL_INDEX ();
2941 bool optional
, rest
;
2945 if (EQ (XCAR (fun
), Qclosure
))
2947 fun
= XCDR (fun
); /* Drop `closure'. */
2948 lexenv
= XCAR (fun
);
2949 CHECK_LIST_CONS (fun
, fun
);
2953 syms_left
= XCDR (fun
);
2954 if (CONSP (syms_left
))
2955 syms_left
= XCAR (syms_left
);
2957 xsignal1 (Qinvalid_function
, fun
);
2959 else if (COMPILEDP (fun
))
2961 syms_left
= AREF (fun
, COMPILED_ARGLIST
);
2962 if (INTEGERP (syms_left
))
2963 /* A byte-code object with a non-nil `push args' slot means we
2964 shouldn't bind any arguments, instead just call the byte-code
2965 interpreter directly; it will push arguments as necessary.
2967 Byte-code objects with either a non-existent, or a nil value for
2968 the `push args' slot (the default), have dynamically-bound
2969 arguments, and use the argument-binding code below instead (as do
2970 all interpreted functions, even lexically bound ones). */
2972 /* If we have not actually read the bytecode string
2973 and constants vector yet, fetch them from the file. */
2974 if (CONSP (AREF (fun
, COMPILED_BYTECODE
)))
2975 Ffetch_bytecode (fun
);
2976 return exec_byte_code (AREF (fun
, COMPILED_BYTECODE
),
2977 AREF (fun
, COMPILED_CONSTANTS
),
2978 AREF (fun
, COMPILED_STACK_DEPTH
),
2987 i
= optional
= rest
= 0;
2988 for (; CONSP (syms_left
); syms_left
= XCDR (syms_left
))
2992 next
= XCAR (syms_left
);
2993 if (!SYMBOLP (next
))
2994 xsignal1 (Qinvalid_function
, fun
);
2996 if (EQ (next
, Qand_rest
))
2998 else if (EQ (next
, Qand_optional
))
3005 arg
= Flist (nargs
- i
, &arg_vector
[i
]);
3009 arg
= arg_vector
[i
++];
3011 xsignal2 (Qwrong_number_of_arguments
, fun
, make_number (nargs
));
3015 /* Bind the argument. */
3016 if (!NILP (lexenv
) && SYMBOLP (next
))
3017 /* Lexically bind NEXT by adding it to the lexenv alist. */
3018 lexenv
= Fcons (Fcons (next
, arg
), lexenv
);
3020 /* Dynamically bind NEXT. */
3021 specbind (next
, arg
);
3025 if (!NILP (syms_left
))
3026 xsignal1 (Qinvalid_function
, fun
);
3028 xsignal2 (Qwrong_number_of_arguments
, fun
, make_number (nargs
));
3030 if (!EQ (lexenv
, Vinternal_interpreter_environment
))
3031 /* Instantiate a new lexical environment. */
3032 specbind (Qinternal_interpreter_environment
, lexenv
);
3035 val
= Fprogn (XCDR (XCDR (fun
)));
3038 /* If we have not actually read the bytecode string
3039 and constants vector yet, fetch them from the file. */
3040 if (CONSP (AREF (fun
, COMPILED_BYTECODE
)))
3041 Ffetch_bytecode (fun
);
3042 val
= exec_byte_code (AREF (fun
, COMPILED_BYTECODE
),
3043 AREF (fun
, COMPILED_CONSTANTS
),
3044 AREF (fun
, COMPILED_STACK_DEPTH
),
3048 return unbind_to (count
, val
);
3051 DEFUN ("fetch-bytecode", Ffetch_bytecode
, Sfetch_bytecode
,
3053 doc
: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */)
3054 (Lisp_Object object
)
3058 if (COMPILEDP (object
) && CONSP (AREF (object
, COMPILED_BYTECODE
)))
3060 tem
= read_doc_string (AREF (object
, COMPILED_BYTECODE
));
3063 tem
= AREF (object
, COMPILED_BYTECODE
);
3064 if (CONSP (tem
) && STRINGP (XCAR (tem
)))
3065 error ("Invalid byte code in %s", SDATA (XCAR (tem
)));
3067 error ("Invalid byte code");
3069 ASET (object
, COMPILED_BYTECODE
, XCAR (tem
));
3070 ASET (object
, COMPILED_CONSTANTS
, XCDR (tem
));
3075 /* Return true if SYMBOL currently has a let-binding
3076 which was made in the buffer that is now current. */
3079 let_shadows_buffer_binding_p (struct Lisp_Symbol
*symbol
)
3081 union specbinding
*p
;
3082 Lisp_Object buf
= Fcurrent_buffer ();
3084 for (p
= specpdl_ptr
; p
> specpdl
; )
3085 if ((--p
)->kind
> SPECPDL_LET
)
3087 struct Lisp_Symbol
*let_bound_symbol
= XSYMBOL (specpdl_symbol (p
));
3088 eassert (let_bound_symbol
->redirect
!= SYMBOL_VARALIAS
);
3089 if (symbol
== let_bound_symbol
3090 && EQ (specpdl_where (p
), buf
))
3098 let_shadows_global_binding_p (Lisp_Object symbol
)
3100 union specbinding
*p
;
3102 for (p
= specpdl_ptr
; p
> specpdl
; )
3103 if ((--p
)->kind
>= SPECPDL_LET
&& EQ (specpdl_symbol (p
), symbol
))
3109 /* `specpdl_ptr' describes which variable is
3110 let-bound, so it can be properly undone when we unbind_to.
3111 It can be either a plain SPECPDL_LET or a SPECPDL_LET_LOCAL/DEFAULT.
3112 - SYMBOL is the variable being bound. Note that it should not be
3113 aliased (i.e. when let-binding V1 that's aliased to V2, we want
3115 - WHERE tells us in which buffer the binding took place.
3116 This is used for SPECPDL_LET_LOCAL bindings (i.e. bindings to a
3117 buffer-local variable) as well as for SPECPDL_LET_DEFAULT bindings,
3118 i.e. bindings to the default value of a variable which can be
3122 specbind (Lisp_Object symbol
, Lisp_Object value
)
3124 struct Lisp_Symbol
*sym
;
3126 CHECK_SYMBOL (symbol
);
3127 sym
= XSYMBOL (symbol
);
3130 switch (sym
->redirect
)
3132 case SYMBOL_VARALIAS
:
3133 sym
= indirect_variable (sym
); XSETSYMBOL (symbol
, sym
); goto start
;
3134 case SYMBOL_PLAINVAL
:
3135 /* The most common case is that of a non-constant symbol with a
3136 trivial value. Make that as fast as we can. */
3137 specpdl_ptr
->let
.kind
= SPECPDL_LET
;
3138 specpdl_ptr
->let
.symbol
= symbol
;
3139 specpdl_ptr
->let
.old_value
= SYMBOL_VAL (sym
);
3142 SET_SYMBOL_VAL (sym
, value
);
3144 set_internal (symbol
, value
, Qnil
, 1);
3146 case SYMBOL_LOCALIZED
:
3147 if (SYMBOL_BLV (sym
)->frame_local
)
3148 error ("Frame-local vars cannot be let-bound");
3149 case SYMBOL_FORWARDED
:
3151 Lisp_Object ovalue
= find_symbol_value (symbol
);
3152 specpdl_ptr
->let
.kind
= SPECPDL_LET_LOCAL
;
3153 specpdl_ptr
->let
.symbol
= symbol
;
3154 specpdl_ptr
->let
.old_value
= ovalue
;
3155 specpdl_ptr
->let
.where
= Fcurrent_buffer ();
3157 eassert (sym
->redirect
!= SYMBOL_LOCALIZED
3158 || (EQ (SYMBOL_BLV (sym
)->where
, Fcurrent_buffer ())));
3160 if (sym
->redirect
== SYMBOL_LOCALIZED
)
3162 if (!blv_found (SYMBOL_BLV (sym
)))
3163 specpdl_ptr
->let
.kind
= SPECPDL_LET_DEFAULT
;
3165 else if (BUFFER_OBJFWDP (SYMBOL_FWD (sym
)))
3167 /* If SYMBOL is a per-buffer variable which doesn't have a
3168 buffer-local value here, make the `let' change the global
3169 value by changing the value of SYMBOL in all buffers not
3170 having their own value. This is consistent with what
3171 happens with other buffer-local variables. */
3172 if (NILP (Flocal_variable_p (symbol
, Qnil
)))
3174 specpdl_ptr
->let
.kind
= SPECPDL_LET_DEFAULT
;
3176 Fset_default (symbol
, value
);
3181 specpdl_ptr
->let
.kind
= SPECPDL_LET
;
3184 set_internal (symbol
, value
, Qnil
, 1);
3187 default: emacs_abort ();
3191 /* Push unwind-protect entries of various types. */
3194 record_unwind_protect (void (*function
) (Lisp_Object
), Lisp_Object arg
)
3196 specpdl_ptr
->unwind
.kind
= SPECPDL_UNWIND
;
3197 specpdl_ptr
->unwind
.func
= function
;
3198 specpdl_ptr
->unwind
.arg
= arg
;
3203 record_unwind_protect_ptr (void (*function
) (void *), void *arg
)
3205 specpdl_ptr
->unwind_ptr
.kind
= SPECPDL_UNWIND_PTR
;
3206 specpdl_ptr
->unwind_ptr
.func
= function
;
3207 specpdl_ptr
->unwind_ptr
.arg
= arg
;
3212 record_unwind_protect_int (void (*function
) (int), int arg
)
3214 specpdl_ptr
->unwind_int
.kind
= SPECPDL_UNWIND_INT
;
3215 specpdl_ptr
->unwind_int
.func
= function
;
3216 specpdl_ptr
->unwind_int
.arg
= arg
;
3221 record_unwind_protect_void (void (*function
) (void))
3223 specpdl_ptr
->unwind_void
.kind
= SPECPDL_UNWIND_VOID
;
3224 specpdl_ptr
->unwind_void
.func
= function
;
3232 /* Push an unwind-protect entry that does nothing, so that
3233 set_unwind_protect_ptr can overwrite it later. */
3236 record_unwind_protect_nothing (void)
3238 record_unwind_protect_void (do_nothing
);
3241 /* Clear the unwind-protect entry COUNT, so that it does nothing.
3242 It need not be at the top of the stack. */
3245 clear_unwind_protect (ptrdiff_t count
)
3247 union specbinding
*p
= specpdl
+ count
;
3248 p
->unwind_void
.kind
= SPECPDL_UNWIND_VOID
;
3249 p
->unwind_void
.func
= do_nothing
;
3252 /* Set the unwind-protect entry COUNT so that it invokes FUNC (ARG).
3253 It need not be at the top of the stack. Discard the entry's
3254 previous value without invoking it. */
3257 set_unwind_protect (ptrdiff_t count
, void (*func
) (Lisp_Object
),
3260 union specbinding
*p
= specpdl
+ count
;
3261 p
->unwind
.kind
= SPECPDL_UNWIND
;
3262 p
->unwind
.func
= func
;
3263 p
->unwind
.arg
= arg
;
3267 set_unwind_protect_ptr (ptrdiff_t count
, void (*func
) (void *), void *arg
)
3269 union specbinding
*p
= specpdl
+ count
;
3270 p
->unwind_ptr
.kind
= SPECPDL_UNWIND_PTR
;
3271 p
->unwind_ptr
.func
= func
;
3272 p
->unwind_ptr
.arg
= arg
;
3275 /* Pop and execute entries from the unwind-protect stack until the
3276 depth COUNT is reached. Return VALUE. */
3279 unbind_to (ptrdiff_t count
, Lisp_Object value
)
3281 Lisp_Object quitf
= Vquit_flag
;
3282 struct gcpro gcpro1
, gcpro2
;
3284 GCPRO2 (value
, quitf
);
3287 while (specpdl_ptr
!= specpdl
+ count
)
3289 /* Decrement specpdl_ptr before we do the work to unbind it, so
3290 that an error in unbinding won't try to unbind the same entry
3291 again. Take care to copy any parts of the binding needed
3292 before invoking any code that can make more bindings. */
3296 switch (specpdl_ptr
->kind
)
3298 case SPECPDL_UNWIND
:
3299 specpdl_ptr
->unwind
.func (specpdl_ptr
->unwind
.arg
);
3301 case SPECPDL_UNWIND_PTR
:
3302 specpdl_ptr
->unwind_ptr
.func (specpdl_ptr
->unwind_ptr
.arg
);
3304 case SPECPDL_UNWIND_INT
:
3305 specpdl_ptr
->unwind_int
.func (specpdl_ptr
->unwind_int
.arg
);
3307 case SPECPDL_UNWIND_VOID
:
3308 specpdl_ptr
->unwind_void
.func ();
3310 case SPECPDL_BACKTRACE
:
3313 { /* If variable has a trivial value (no forwarding), we can
3314 just set it. No need to check for constant symbols here,
3315 since that was already done by specbind. */
3316 struct Lisp_Symbol
*sym
= XSYMBOL (specpdl_symbol (specpdl_ptr
));
3317 if (sym
->redirect
== SYMBOL_PLAINVAL
)
3319 SET_SYMBOL_VAL (sym
, specpdl_old_value (specpdl_ptr
));
3324 NOTE: we only ever come here if make_local_foo was used for
3325 the first time on this var within this let. */
3328 case SPECPDL_LET_DEFAULT
:
3329 Fset_default (specpdl_symbol (specpdl_ptr
),
3330 specpdl_old_value (specpdl_ptr
));
3332 case SPECPDL_LET_LOCAL
:
3334 Lisp_Object symbol
= specpdl_symbol (specpdl_ptr
);
3335 Lisp_Object where
= specpdl_where (specpdl_ptr
);
3336 Lisp_Object old_value
= specpdl_old_value (specpdl_ptr
);
3337 eassert (BUFFERP (where
));
3339 /* If this was a local binding, reset the value in the appropriate
3340 buffer, but only if that buffer's binding still exists. */
3341 if (!NILP (Flocal_variable_p (symbol
, where
)))
3342 set_internal (symbol
, old_value
, where
, 1);
3348 if (NILP (Vquit_flag
) && !NILP (quitf
))
3355 DEFUN ("special-variable-p", Fspecial_variable_p
, Sspecial_variable_p
, 1, 1, 0,
3356 doc
: /* Return non-nil if SYMBOL's global binding has been declared special.
3357 A special variable is one that will be bound dynamically, even in a
3358 context where binding is lexical by default. */)
3359 (Lisp_Object symbol
)
3361 CHECK_SYMBOL (symbol
);
3362 return XSYMBOL (symbol
)->declared_special
? Qt
: Qnil
;
3366 DEFUN ("backtrace-debug", Fbacktrace_debug
, Sbacktrace_debug
, 2, 2, 0,
3367 doc
: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.
3368 The debugger is entered when that frame exits, if the flag is non-nil. */)
3369 (Lisp_Object level
, Lisp_Object flag
)
3371 union specbinding
*pdl
= backtrace_top ();
3372 register EMACS_INT i
;
3374 CHECK_NUMBER (level
);
3376 for (i
= 0; backtrace_p (pdl
) && i
< XINT (level
); i
++)
3377 pdl
= backtrace_next (pdl
);
3379 if (backtrace_p (pdl
))
3380 set_backtrace_debug_on_exit (pdl
, !NILP (flag
));
3385 DEFUN ("backtrace", Fbacktrace
, Sbacktrace
, 0, 0, "",
3386 doc
: /* Print a trace of Lisp function calls currently active.
3387 Output stream used is value of `standard-output'. */)
3390 union specbinding
*pdl
= backtrace_top ();
3392 Lisp_Object old_print_level
= Vprint_level
;
3394 if (NILP (Vprint_level
))
3395 XSETFASTINT (Vprint_level
, 8);
3397 while (backtrace_p (pdl
))
3399 write_string (backtrace_debug_on_exit (pdl
) ? "* " : " ", 2);
3400 if (backtrace_nargs (pdl
) == UNEVALLED
)
3402 Fprin1 (Fcons (backtrace_function (pdl
), *backtrace_args (pdl
)),
3404 write_string ("\n", -1);
3408 tem
= backtrace_function (pdl
);
3409 Fprin1 (tem
, Qnil
); /* This can QUIT. */
3410 write_string ("(", -1);
3413 for (i
= 0; i
< backtrace_nargs (pdl
); i
++)
3415 if (i
) write_string (" ", -1);
3416 Fprin1 (backtrace_args (pdl
)[i
], Qnil
);
3419 write_string (")\n", -1);
3421 pdl
= backtrace_next (pdl
);
3424 Vprint_level
= old_print_level
;
3428 static union specbinding
*
3429 get_backtrace_frame (Lisp_Object nframes
, Lisp_Object base
)
3431 union specbinding
*pdl
= backtrace_top ();
3432 register EMACS_INT i
;
3434 CHECK_NATNUM (nframes
);
3437 { /* Skip up to `base'. */
3438 base
= Findirect_function (base
, Qt
);
3439 while (backtrace_p (pdl
)
3440 && !EQ (base
, Findirect_function (backtrace_function (pdl
), Qt
)))
3441 pdl
= backtrace_next (pdl
);
3444 /* Find the frame requested. */
3445 for (i
= XFASTINT (nframes
); i
> 0 && backtrace_p (pdl
); i
--)
3446 pdl
= backtrace_next (pdl
);
3451 DEFUN ("backtrace-frame", Fbacktrace_frame
, Sbacktrace_frame
, 1, 2, NULL
,
3452 doc
: /* Return the function and arguments NFRAMES up from current execution point.
3453 If that frame has not evaluated the arguments yet (or is a special form),
3454 the value is (nil FUNCTION ARG-FORMS...).
3455 If that frame has evaluated its arguments and called its function already,
3456 the value is (t FUNCTION ARG-VALUES...).
3457 A &rest arg is represented as the tail of the list ARG-VALUES.
3458 FUNCTION is whatever was supplied as car of evaluated list,
3459 or a lambda expression for macro calls.
3460 If NFRAMES is more than the number of frames, the value is nil.
3461 If BASE is non-nil, it should be a function and NFRAMES counts from its
3462 nearest activation frame. */)
3463 (Lisp_Object nframes
, Lisp_Object base
)
3465 union specbinding
*pdl
= get_backtrace_frame (nframes
, base
);
3467 if (!backtrace_p (pdl
))
3469 if (backtrace_nargs (pdl
) == UNEVALLED
)
3471 Fcons (backtrace_function (pdl
), *backtrace_args (pdl
)));
3474 Lisp_Object tem
= Flist (backtrace_nargs (pdl
), backtrace_args (pdl
));
3476 return Fcons (Qt
, Fcons (backtrace_function (pdl
), tem
));
3480 /* For backtrace-eval, we want to temporarily unwind the last few elements of
3481 the specpdl stack, and then rewind them. We store the pre-unwind values
3482 directly in the pre-existing specpdl elements (i.e. we swap the current
3483 value and the old value stored in the specpdl), kind of like the inplace
3484 pointer-reversal trick. As it turns out, the rewind does the same as the
3485 unwind, except it starts from the other end of the specpdl stack, so we use
3486 the same function for both unwind and rewind. */
3488 backtrace_eval_unrewind (int distance
)
3490 union specbinding
*tmp
= specpdl_ptr
;
3493 { /* It's a rewind rather than unwind. */
3494 tmp
+= distance
- 1;
3496 distance
= -distance
;
3499 for (; distance
> 0; distance
--)
3505 /* FIXME: Ideally we'd like to "temporarily unwind" (some of) those
3506 unwind_protect, but the problem is that we don't know how to
3507 rewind them afterwards. */
3508 case SPECPDL_UNWIND
:
3509 case SPECPDL_UNWIND_PTR
:
3510 case SPECPDL_UNWIND_INT
:
3511 case SPECPDL_UNWIND_VOID
:
3512 case SPECPDL_BACKTRACE
:
3515 { /* If variable has a trivial value (no forwarding), we can
3516 just set it. No need to check for constant symbols here,
3517 since that was already done by specbind. */
3518 struct Lisp_Symbol
*sym
= XSYMBOL (specpdl_symbol (tmp
));
3519 if (sym
->redirect
== SYMBOL_PLAINVAL
)
3521 Lisp_Object old_value
= specpdl_old_value (tmp
);
3522 set_specpdl_old_value (tmp
, SYMBOL_VAL (sym
));
3523 SET_SYMBOL_VAL (sym
, old_value
);
3528 NOTE: we only ever come here if make_local_foo was used for
3529 the first time on this var within this let. */
3532 case SPECPDL_LET_DEFAULT
:
3534 Lisp_Object sym
= specpdl_symbol (tmp
);
3535 Lisp_Object old_value
= specpdl_old_value (tmp
);
3536 set_specpdl_old_value (tmp
, Fdefault_value (sym
));
3537 Fset_default (sym
, old_value
);
3540 case SPECPDL_LET_LOCAL
:
3542 Lisp_Object symbol
= specpdl_symbol (tmp
);
3543 Lisp_Object where
= specpdl_where (tmp
);
3544 Lisp_Object old_value
= specpdl_old_value (tmp
);
3545 eassert (BUFFERP (where
));
3547 /* If this was a local binding, reset the value in the appropriate
3548 buffer, but only if that buffer's binding still exists. */
3549 if (!NILP (Flocal_variable_p (symbol
, where
)))
3551 set_specpdl_old_value
3552 (tmp
, Fbuffer_local_value (symbol
, where
));
3553 set_internal (symbol
, old_value
, where
, 1);
3561 DEFUN ("backtrace-eval", Fbacktrace_eval
, Sbacktrace_eval
, 2, 3, NULL
,
3562 doc
: /* Evaluate EXP in the context of some activation frame.
3563 NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */)
3564 (Lisp_Object exp
, Lisp_Object nframes
, Lisp_Object base
)
3566 union specbinding
*pdl
= get_backtrace_frame (nframes
, base
);
3567 ptrdiff_t count
= SPECPDL_INDEX ();
3568 ptrdiff_t distance
= specpdl_ptr
- pdl
;
3569 eassert (distance
>= 0);
3571 if (!backtrace_p (pdl
))
3572 error ("Activation frame not found!");
3574 backtrace_eval_unrewind (distance
);
3575 record_unwind_protect_int (backtrace_eval_unrewind
, -distance
);
3577 /* Use eval_sub rather than Feval since the main motivation behind
3578 backtrace-eval is to be able to get/set the value of lexical variables
3579 from the debugger. */
3580 return unbind_to (count
, eval_sub (exp
));
3583 DEFUN ("backtrace--locals", Fbacktrace__locals
, Sbacktrace__locals
, 1, 2, NULL
,
3584 doc
: /* Return names and values of local variables of a stack frame.
3585 NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */)
3586 (Lisp_Object nframes
, Lisp_Object base
)
3588 union specbinding
*frame
= get_backtrace_frame (nframes
, base
);
3589 union specbinding
*prevframe
3590 = get_backtrace_frame (make_number (XFASTINT (nframes
) - 1), base
);
3591 ptrdiff_t distance
= specpdl_ptr
- frame
;
3592 Lisp_Object result
= Qnil
;
3593 eassert (distance
>= 0);
3595 if (!backtrace_p (prevframe
))
3596 error ("Activation frame not found!");
3597 if (!backtrace_p (frame
))
3598 error ("Activation frame not found!");
3600 /* The specpdl entries normally contain the symbol being bound along with its
3601 `old_value', so it can be restored. The new value to which it is bound is
3602 available in one of two places: either in the current value of the
3603 variable (if it hasn't been rebound yet) or in the `old_value' slot of the
3604 next specpdl entry for it.
3605 `backtrace_eval_unrewind' happens to swap the role of `old_value'
3606 and "new value", so we abuse it here, to fetch the new value.
3607 It's ugly (we'd rather not modify global data) and a bit inefficient,
3608 but it does the job for now. */
3609 backtrace_eval_unrewind (distance
);
3613 union specbinding
*tmp
= prevframe
;
3614 for (; tmp
> frame
; tmp
--)
3619 case SPECPDL_LET_DEFAULT
:
3620 case SPECPDL_LET_LOCAL
:
3622 Lisp_Object sym
= specpdl_symbol (tmp
);
3623 Lisp_Object val
= specpdl_old_value (tmp
);
3624 if (EQ (sym
, Qinternal_interpreter_environment
))
3626 Lisp_Object env
= val
;
3627 for (; CONSP (env
); env
= XCDR (env
))
3629 Lisp_Object binding
= XCAR (env
);
3630 if (CONSP (binding
))
3631 result
= Fcons (Fcons (XCAR (binding
),
3637 result
= Fcons (Fcons (sym
, val
), result
);
3643 /* Restore values from specpdl to original place. */
3644 backtrace_eval_unrewind (-distance
);
3653 union specbinding
*pdl
;
3654 for (pdl
= specpdl
; pdl
!= specpdl_ptr
; pdl
++)
3658 case SPECPDL_UNWIND
:
3659 mark_object (specpdl_arg (pdl
));
3662 case SPECPDL_BACKTRACE
:
3664 ptrdiff_t nargs
= backtrace_nargs (pdl
);
3665 mark_object (backtrace_function (pdl
));
3666 if (nargs
== UNEVALLED
)
3669 mark_object (backtrace_args (pdl
)[nargs
]);
3673 case SPECPDL_LET_DEFAULT
:
3674 case SPECPDL_LET_LOCAL
:
3675 mark_object (specpdl_where (pdl
));
3678 mark_object (specpdl_symbol (pdl
));
3679 mark_object (specpdl_old_value (pdl
));
3686 get_backtrace (Lisp_Object array
)
3688 union specbinding
*pdl
= backtrace_next (backtrace_top ());
3689 ptrdiff_t i
= 0, asize
= ASIZE (array
);
3691 /* Copy the backtrace contents into working memory. */
3692 for (; i
< asize
; i
++)
3694 if (backtrace_p (pdl
))
3696 ASET (array
, i
, backtrace_function (pdl
));
3697 pdl
= backtrace_next (pdl
);
3700 ASET (array
, i
, Qnil
);
3704 Lisp_Object
backtrace_top_function (void)
3706 union specbinding
*pdl
= backtrace_top ();
3707 return (backtrace_p (pdl
) ? backtrace_function (pdl
) : Qnil
);
3713 DEFVAR_INT ("max-specpdl-size", max_specpdl_size
,
3714 doc
: /* Limit on number of Lisp variable bindings and `unwind-protect's.
3715 If Lisp code tries to increase the total number past this amount,
3716 an error is signaled.
3717 You can safely use a value considerably larger than the default value,
3718 if that proves inconveniently small. However, if you increase it too far,
3719 Emacs could run out of memory trying to make the stack bigger.
3720 Note that this limit may be silently increased by the debugger
3721 if `debug-on-error' or `debug-on-quit' is set. */);
3723 DEFVAR_INT ("max-lisp-eval-depth", max_lisp_eval_depth
,
3724 doc
: /* Limit on depth in `eval', `apply' and `funcall' before error.
3726 This limit serves to catch infinite recursions for you before they cause
3727 actual stack overflow in C, which would be fatal for Emacs.
3728 You can safely make it considerably larger than its default value,
3729 if that proves inconveniently small. However, if you increase it too far,
3730 Emacs could overflow the real C stack, and crash. */);
3732 DEFVAR_LISP ("quit-flag", Vquit_flag
,
3733 doc
: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.
3734 If the value is t, that means do an ordinary quit.
3735 If the value equals `throw-on-input', that means quit by throwing
3736 to the tag specified in `throw-on-input'; it's for handling `while-no-input'.
3737 Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit',
3738 but `inhibit-quit' non-nil prevents anything from taking notice of that. */);
3741 DEFVAR_LISP ("inhibit-quit", Vinhibit_quit
,
3742 doc
: /* Non-nil inhibits C-g quitting from happening immediately.
3743 Note that `quit-flag' will still be set by typing C-g,
3744 so a quit will be signaled as soon as `inhibit-quit' is nil.
3745 To prevent this happening, set `quit-flag' to nil
3746 before making `inhibit-quit' nil. */);
3747 Vinhibit_quit
= Qnil
;
3749 DEFSYM (Qinhibit_quit
, "inhibit-quit");
3750 DEFSYM (Qautoload
, "autoload");
3751 DEFSYM (Qinhibit_debugger
, "inhibit-debugger");
3752 DEFSYM (Qmacro
, "macro");
3753 DEFSYM (Qdeclare
, "declare");
3755 /* Note that the process handling also uses Qexit, but we don't want
3756 to staticpro it twice, so we just do it here. */
3757 DEFSYM (Qexit
, "exit");
3759 DEFSYM (Qinteractive
, "interactive");
3760 DEFSYM (Qcommandp
, "commandp");
3761 DEFSYM (Qand_rest
, "&rest");
3762 DEFSYM (Qand_optional
, "&optional");
3763 DEFSYM (Qclosure
, "closure");
3764 DEFSYM (Qdebug
, "debug");
3766 DEFVAR_LISP ("inhibit-debugger", Vinhibit_debugger
,
3767 doc
: /* Non-nil means never enter the debugger.
3768 Normally set while the debugger is already active, to avoid recursive
3770 Vinhibit_debugger
= Qnil
;
3772 DEFVAR_LISP ("debug-on-error", Vdebug_on_error
,
3773 doc
: /* Non-nil means enter debugger if an error is signaled.
3774 Does not apply to errors handled by `condition-case' or those
3775 matched by `debug-ignored-errors'.
3776 If the value is a list, an error only means to enter the debugger
3777 if one of its condition symbols appears in the list.
3778 When you evaluate an expression interactively, this variable
3779 is temporarily non-nil if `eval-expression-debug-on-error' is non-nil.
3780 The command `toggle-debug-on-error' toggles this.
3781 See also the variable `debug-on-quit' and `inhibit-debugger'. */);
3782 Vdebug_on_error
= Qnil
;
3784 DEFVAR_LISP ("debug-ignored-errors", Vdebug_ignored_errors
,
3785 doc
: /* List of errors for which the debugger should not be called.
3786 Each element may be a condition-name or a regexp that matches error messages.
3787 If any element applies to a given error, that error skips the debugger
3788 and just returns to top level.
3789 This overrides the variable `debug-on-error'.
3790 It does not apply to errors handled by `condition-case'. */);
3791 Vdebug_ignored_errors
= Qnil
;
3793 DEFVAR_BOOL ("debug-on-quit", debug_on_quit
,
3794 doc
: /* Non-nil means enter debugger if quit is signaled (C-g, for example).
3795 Does not apply if quit is handled by a `condition-case'. */);
3798 DEFVAR_BOOL ("debug-on-next-call", debug_on_next_call
,
3799 doc
: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */);
3801 DEFVAR_BOOL ("debugger-may-continue", debugger_may_continue
,
3802 doc
: /* Non-nil means debugger may continue execution.
3803 This is nil when the debugger is called under circumstances where it
3804 might not be safe to continue. */);
3805 debugger_may_continue
= 1;
3807 DEFVAR_LISP ("debugger", Vdebugger
,
3808 doc
: /* Function to call to invoke debugger.
3809 If due to frame exit, args are `exit' and the value being returned;
3810 this function's value will be returned instead of that.
3811 If due to error, args are `error' and a list of the args to `signal'.
3812 If due to `apply' or `funcall' entry, one arg, `lambda'.
3813 If due to `eval' entry, one arg, t. */);
3816 DEFVAR_LISP ("signal-hook-function", Vsignal_hook_function
,
3817 doc
: /* If non-nil, this is a function for `signal' to call.
3818 It receives the same arguments that `signal' was given.
3819 The Edebug package uses this to regain control. */);
3820 Vsignal_hook_function
= Qnil
;
3822 DEFVAR_LISP ("debug-on-signal", Vdebug_on_signal
,
3823 doc
: /* Non-nil means call the debugger regardless of condition handlers.
3824 Note that `debug-on-error', `debug-on-quit' and friends
3825 still determine whether to handle the particular condition. */);
3826 Vdebug_on_signal
= Qnil
;
3828 /* When lexical binding is being used,
3829 Vinternal_interpreter_environment is non-nil, and contains an alist
3830 of lexically-bound variable, or (t), indicating an empty
3831 environment. The lisp name of this variable would be
3832 `internal-interpreter-environment' if it weren't hidden.
3833 Every element of this list can be either a cons (VAR . VAL)
3834 specifying a lexical binding, or a single symbol VAR indicating
3835 that this variable should use dynamic scoping. */
3836 DEFSYM (Qinternal_interpreter_environment
,
3837 "internal-interpreter-environment");
3838 DEFVAR_LISP ("internal-interpreter-environment",
3839 Vinternal_interpreter_environment
,
3840 doc
: /* If non-nil, the current lexical environment of the lisp interpreter.
3841 When lexical binding is not being used, this variable is nil.
3842 A value of `(t)' indicates an empty environment, otherwise it is an
3843 alist of active lexical bindings. */);
3844 Vinternal_interpreter_environment
= Qnil
;
3845 /* Don't export this variable to Elisp, so no one can mess with it
3846 (Just imagine if someone makes it buffer-local). */
3847 Funintern (Qinternal_interpreter_environment
, Qnil
);
3849 DEFSYM (Vrun_hooks
, "run-hooks");
3851 staticpro (&Vautoload_queue
);
3852 Vautoload_queue
= Qnil
;
3853 staticpro (&Vsignaling_function
);
3854 Vsignaling_function
= Qnil
;
3856 inhibit_lisp_code
= Qnil
;
3867 defsubr (&Sfunction
);
3868 defsubr (&Sdefault_toplevel_value
);
3869 defsubr (&Sset_default_toplevel_value
);
3871 defsubr (&Sdefvaralias
);
3872 defsubr (&Sdefconst
);
3873 defsubr (&Smake_var_non_special
);
3877 defsubr (&Smacroexpand
);
3880 defsubr (&Sunwind_protect
);
3881 defsubr (&Scondition_case
);
3883 defsubr (&Scommandp
);
3884 defsubr (&Sautoload
);
3885 defsubr (&Sautoload_do_load
);
3888 defsubr (&Sfuncall
);
3889 defsubr (&Srun_hooks
);
3890 defsubr (&Srun_hook_with_args
);
3891 defsubr (&Srun_hook_with_args_until_success
);
3892 defsubr (&Srun_hook_with_args_until_failure
);
3893 defsubr (&Srun_hook_wrapped
);
3894 defsubr (&Sfetch_bytecode
);
3895 defsubr (&Sbacktrace_debug
);
3896 defsubr (&Sbacktrace
);
3897 defsubr (&Sbacktrace_frame
);
3898 defsubr (&Sbacktrace_eval
);
3899 defsubr (&Sbacktrace__locals
);
3900 defsubr (&Sspecial_variable_p
);
3901 defsubr (&Sfunctionp
);