1 /* Evaluator for GNU Emacs Lisp interpreter.
2 Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
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/>. */
25 #include "blockinput.h"
28 #include "dispextern.h"
34 /* This definition is duplicated in alloc.c and keyboard.c */
35 /* Putting it in lisp.h makes cc bomb out! */
39 struct backtrace
*next
;
40 Lisp_Object
*function
;
41 Lisp_Object
*args
; /* Points to vector of args. */
42 int nargs
; /* Length of vector.
43 If nargs is UNEVALLED, args points to slot holding
44 list of unevalled args */
46 /* Nonzero means call value of debugger when done with this operation. */
50 struct backtrace
*backtrace_list
;
52 struct catchtag
*catchlist
;
55 /* Count levels of GCPRO to detect failure to UNGCPRO. */
59 Lisp_Object Qautoload
, Qmacro
, Qexit
, Qinteractive
, Qcommandp
, Qdefun
;
60 Lisp_Object Qinhibit_quit
, Vinhibit_quit
, Vquit_flag
;
61 Lisp_Object Qand_rest
, Qand_optional
;
62 Lisp_Object Qdebug_on_error
;
65 extern Lisp_Object Qinteractive_form
;
67 /* This holds either the symbol `run-hooks' or nil.
68 It is nil at an early stage of startup, and when Emacs
71 Lisp_Object Vrun_hooks
;
73 /* Non-nil means record all fset's and provide's, to be undone
74 if the file being autoloaded is not fully loaded.
75 They are recorded by being consed onto the front of Vautoload_queue:
76 (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */
78 Lisp_Object Vautoload_queue
;
80 /* Current number of specbindings allocated in specpdl. */
84 /* Pointer to beginning of specpdl. */
86 struct specbinding
*specpdl
;
88 /* Pointer to first unused element in specpdl. */
90 struct specbinding
*specpdl_ptr
;
92 /* Maximum size allowed for specpdl allocation */
94 EMACS_INT max_specpdl_size
;
96 /* Depth in Lisp evaluations and function calls. */
100 /* Maximum allowed depth in Lisp evaluations and function calls. */
102 EMACS_INT max_lisp_eval_depth
;
104 /* Nonzero means enter debugger before next function call */
106 int debug_on_next_call
;
108 /* Non-zero means debugger may continue. This is zero when the
109 debugger is called during redisplay, where it might not be safe to
110 continue the interrupted redisplay. */
112 int debugger_may_continue
;
114 /* List of conditions (non-nil atom means all) which cause a backtrace
115 if an error is handled by the command loop's error handler. */
117 Lisp_Object Vstack_trace_on_error
;
119 /* List of conditions (non-nil atom means all) which enter the debugger
120 if an error is handled by the command loop's error handler. */
122 Lisp_Object Vdebug_on_error
;
124 /* List of conditions and regexps specifying error messages which
125 do not enter the debugger even if Vdebug_on_error says they should. */
127 Lisp_Object Vdebug_ignored_errors
;
129 /* Non-nil means call the debugger even if the error will be handled. */
131 Lisp_Object Vdebug_on_signal
;
133 /* Hook for edebug to use. */
135 Lisp_Object Vsignal_hook_function
;
137 /* Nonzero means enter debugger if a quit signal
138 is handled by the command loop's error handler. */
142 /* The value of num_nonmacro_input_events as of the last time we
143 started to enter the debugger. If we decide to enter the debugger
144 again when this is still equal to num_nonmacro_input_events, then we
145 know that the debugger itself has an error, and we should just
146 signal the error instead of entering an infinite loop of debugger
149 int when_entered_debugger
;
151 Lisp_Object Vdebugger
;
153 /* The function from which the last `signal' was called. Set in
156 Lisp_Object Vsignaling_function
;
158 /* Set to non-zero while processing X events. Checked in Feval to
159 make sure the Lisp interpreter isn't called from a signal handler,
160 which is unsafe because the interpreter isn't reentrant. */
164 /* Function to process declarations in defmacro forms. */
166 Lisp_Object Vmacro_declaration_function
;
168 extern Lisp_Object Qrisky_local_variable
;
170 extern Lisp_Object Qfunction
;
172 static Lisp_Object funcall_lambda
P_ ((Lisp_Object
, int, Lisp_Object
*));
173 static void unwind_to_catch
P_ ((struct catchtag
*, Lisp_Object
)) NO_RETURN
;
176 /* "gcc -O3" enables automatic function inlining, which optimizes out
177 the arguments for the invocations of these functions, whereas they
178 expect these values on the stack. */
179 Lisp_Object
apply1 () __attribute__((noinline
));
180 Lisp_Object
call2 () __attribute__((noinline
));
187 specpdl
= (struct specbinding
*) xmalloc (specpdl_size
* sizeof (struct specbinding
));
188 specpdl_ptr
= specpdl
;
189 /* Don't forget to update docs (lispref node "Local Variables"). */
190 max_specpdl_size
= 1000;
191 max_lisp_eval_depth
= 500;
199 specpdl_ptr
= specpdl
;
204 debug_on_next_call
= 0;
209 /* This is less than the initial value of num_nonmacro_input_events. */
210 when_entered_debugger
= -1;
213 /* unwind-protect function used by call_debugger. */
216 restore_stack_limits (data
)
219 max_specpdl_size
= XINT (XCAR (data
));
220 max_lisp_eval_depth
= XINT (XCDR (data
));
224 /* Call the Lisp debugger, giving it argument ARG. */
230 int debug_while_redisplaying
;
231 int count
= SPECPDL_INDEX ();
233 int old_max
= max_specpdl_size
;
235 /* Temporarily bump up the stack limits,
236 so the debugger won't run out of stack. */
238 max_specpdl_size
+= 1;
239 record_unwind_protect (restore_stack_limits
,
240 Fcons (make_number (old_max
),
241 make_number (max_lisp_eval_depth
)));
242 max_specpdl_size
= old_max
;
244 if (lisp_eval_depth
+ 40 > max_lisp_eval_depth
)
245 max_lisp_eval_depth
= lisp_eval_depth
+ 40;
247 if (SPECPDL_INDEX () + 100 > max_specpdl_size
)
248 max_specpdl_size
= SPECPDL_INDEX () + 100;
250 #ifdef HAVE_WINDOW_SYSTEM
251 if (display_hourglass_p
)
255 debug_on_next_call
= 0;
256 when_entered_debugger
= num_nonmacro_input_events
;
258 /* Resetting redisplaying_p to 0 makes sure that debug output is
259 displayed if the debugger is invoked during redisplay. */
260 debug_while_redisplaying
= redisplaying_p
;
262 specbind (intern ("debugger-may-continue"),
263 debug_while_redisplaying
? Qnil
: Qt
);
264 specbind (Qinhibit_redisplay
, Qnil
);
265 specbind (Qdebug_on_error
, Qnil
);
267 #if 0 /* Binding this prevents execution of Lisp code during
268 redisplay, which necessarily leads to display problems. */
269 specbind (Qinhibit_eval_during_redisplay
, Qt
);
272 val
= apply1 (Vdebugger
, arg
);
274 /* Interrupting redisplay and resuming it later is not safe under
275 all circumstances. So, when the debugger returns, abort the
276 interrupted redisplay by going back to the top-level. */
277 if (debug_while_redisplaying
)
280 return unbind_to (count
, val
);
284 do_debug_on_call (code
)
287 debug_on_next_call
= 0;
288 backtrace_list
->debug_on_exit
= 1;
289 call_debugger (Fcons (code
, Qnil
));
292 /* NOTE!!! Every function that can call EVAL must protect its args
293 and temporaries from garbage collection while it needs them.
294 The definition of `For' shows what you have to do. */
296 DEFUN ("or", For
, Sor
, 0, UNEVALLED
, 0,
297 doc
: /* Eval args until one of them yields non-nil, then return that value.
298 The remaining args are not evalled at all.
299 If all args return nil, return nil.
300 usage: (or CONDITIONS...) */)
304 register Lisp_Object val
= Qnil
;
311 val
= Feval (XCAR (args
));
321 DEFUN ("and", Fand
, Sand
, 0, UNEVALLED
, 0,
322 doc
: /* Eval args until one of them yields nil, then return nil.
323 The remaining args are not evalled at all.
324 If no arg yields nil, return the last arg's value.
325 usage: (and CONDITIONS...) */)
329 register Lisp_Object val
= Qt
;
336 val
= Feval (XCAR (args
));
346 DEFUN ("if", Fif
, Sif
, 2, UNEVALLED
, 0,
347 doc
: /* If COND yields non-nil, do THEN, else do ELSE...
348 Returns the value of THEN or the value of the last of the ELSE's.
349 THEN must be one expression, but ELSE... can be zero or more expressions.
350 If COND yields nil, and there are no ELSE's, the value is nil.
351 usage: (if COND THEN ELSE...) */)
355 register Lisp_Object cond
;
359 cond
= Feval (Fcar (args
));
363 return Feval (Fcar (Fcdr (args
)));
364 return Fprogn (Fcdr (Fcdr (args
)));
367 DEFUN ("cond", Fcond
, Scond
, 0, UNEVALLED
, 0,
368 doc
: /* Try each clause until one succeeds.
369 Each clause looks like (CONDITION BODY...). CONDITION is evaluated
370 and, if the value is non-nil, this clause succeeds:
371 then the expressions in BODY are evaluated and the last one's
372 value is the value of the cond-form.
373 If no clause succeeds, cond returns nil.
374 If a clause has one element, as in (CONDITION),
375 CONDITION's value if non-nil is returned from the cond-form.
376 usage: (cond CLAUSES...) */)
380 register Lisp_Object clause
, val
;
387 clause
= Fcar (args
);
388 val
= Feval (Fcar (clause
));
391 if (!EQ (XCDR (clause
), Qnil
))
392 val
= Fprogn (XCDR (clause
));
402 DEFUN ("progn", Fprogn
, Sprogn
, 0, UNEVALLED
, 0,
403 doc
: /* Eval BODY forms sequentially and return value of last one.
404 usage: (progn BODY...) */)
408 register Lisp_Object val
= Qnil
;
415 val
= Feval (XCAR (args
));
423 DEFUN ("prog1", Fprog1
, Sprog1
, 1, UNEVALLED
, 0,
424 doc
: /* Eval FIRST and BODY sequentially; return value from FIRST.
425 The value of FIRST is saved during the evaluation of the remaining args,
426 whose values are discarded.
427 usage: (prog1 FIRST BODY...) */)
432 register Lisp_Object args_left
;
433 struct gcpro gcpro1
, gcpro2
;
434 register int argnum
= 0;
446 val
= Feval (Fcar (args_left
));
448 Feval (Fcar (args_left
));
449 args_left
= Fcdr (args_left
);
451 while (!NILP(args_left
));
457 DEFUN ("prog2", Fprog2
, Sprog2
, 2, UNEVALLED
, 0,
458 doc
: /* Eval FORM1, FORM2 and BODY sequentially; return value from FORM2.
459 The value of FORM2 is saved during the evaluation of the
460 remaining args, whose values are discarded.
461 usage: (prog2 FORM1 FORM2 BODY...) */)
466 register Lisp_Object args_left
;
467 struct gcpro gcpro1
, gcpro2
;
468 register int argnum
= -1;
482 val
= Feval (Fcar (args_left
));
484 Feval (Fcar (args_left
));
485 args_left
= Fcdr (args_left
);
487 while (!NILP (args_left
));
493 DEFUN ("setq", Fsetq
, Ssetq
, 0, UNEVALLED
, 0,
494 doc
: /* Set each SYM to the value of its VAL.
495 The symbols SYM are variables; they are literal (not evaluated).
496 The values VAL are expressions; they are evaluated.
497 Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.
498 The second VAL is not computed until after the first SYM is set, and so on;
499 each VAL can use the new value of variables set earlier in the `setq'.
500 The return value of the `setq' form is the value of the last VAL.
501 usage: (setq [SYM VAL]...) */)
505 register Lisp_Object args_left
;
506 register Lisp_Object val
, sym
;
517 val
= Feval (Fcar (Fcdr (args_left
)));
518 sym
= Fcar (args_left
);
520 args_left
= Fcdr (Fcdr (args_left
));
522 while (!NILP(args_left
));
528 DEFUN ("quote", Fquote
, Squote
, 1, UNEVALLED
, 0,
529 doc
: /* Return the argument, without evaluating it. `(quote x)' yields `x'.
530 usage: (quote ARG) */)
534 if (!NILP (Fcdr (args
)))
535 xsignal2 (Qwrong_number_of_arguments
, Qquote
, Flength (args
));
539 DEFUN ("function", Ffunction
, Sfunction
, 1, UNEVALLED
, 0,
540 doc
: /* Like `quote', but preferred for objects which are functions.
541 In byte compilation, `function' causes its argument to be compiled.
542 `quote' cannot do that.
543 usage: (function ARG) */)
547 if (!NILP (Fcdr (args
)))
548 xsignal2 (Qwrong_number_of_arguments
, Qfunction
, Flength (args
));
553 DEFUN ("interactive-p", Finteractive_p
, Sinteractive_p
, 0, 0, 0,
554 doc
: /* Return t if the containing function was run directly by user input.
555 This means that the function was called with `call-interactively'
556 \(which includes being called as the binding of a key)
557 and input is currently coming from the keyboard (not a keyboard macro),
558 and Emacs is not running in batch mode (`noninteractive' is nil).
560 The only known proper use of `interactive-p' is in deciding whether to
561 display a helpful message, or how to display it. If you're thinking
562 of using it for any other purpose, it is quite likely that you're
563 making a mistake. Think: what do you want to do when the command is
564 called from a keyboard macro?
566 To test whether your function was called with `call-interactively',
567 either (i) add an extra optional argument and give it an `interactive'
568 spec that specifies non-nil unconditionally (such as \"p\"); or (ii)
569 use `called-interactively-p'. */)
572 return (INTERACTIVE
&& interactive_p (1)) ? Qt
: Qnil
;
576 DEFUN ("called-interactively-p", Fcalled_interactively_p
, Scalled_interactively_p
, 0, 1, 0,
577 doc
: /* Return t if the containing function was called by `call-interactively'.
578 If KIND is `interactive', then only return t if the call was made
579 interactively by the user, i.e. not in `noninteractive' mode nor
580 when `executing-kbd-macro'.
581 If KIND is `any', on the other hand, it will return t for any kind of
582 interactive call, including being called as the binding of a key, or
583 from a keyboard macro, or in `noninteractive' mode.
585 The only known proper use of `interactive' for KIND is in deciding
586 whether to display a helpful message, or how to display it. If you're
587 thinking of using it for any other purpose, it is quite likely that
588 you're making a mistake. Think: what do you want to do when the
589 command is called from a keyboard macro?
591 This function is meant for implementing advice and other
592 function-modifying features. Instead of using this, it is sometimes
593 cleaner to give your function an extra optional argument whose
594 `interactive' spec specifies non-nil unconditionally (\"p\" is a good
595 way to do this), or via (not (or executing-kbd-macro noninteractive)). */)
599 return ((INTERACTIVE
|| !EQ (kind
, intern ("interactive")))
600 && interactive_p (1)) ? Qt
: Qnil
;
604 /* Return 1 if function in which this appears was called using
607 EXCLUDE_SUBRS_P non-zero means always return 0 if the function
608 called is a built-in. */
611 interactive_p (exclude_subrs_p
)
614 struct backtrace
*btp
;
617 btp
= backtrace_list
;
619 /* If this isn't a byte-compiled function, there may be a frame at
620 the top for Finteractive_p. If so, skip it. */
621 fun
= Findirect_function (*btp
->function
, Qnil
);
622 if (SUBRP (fun
) && (XSUBR (fun
) == &Sinteractive_p
623 || XSUBR (fun
) == &Scalled_interactively_p
))
626 /* If we're running an Emacs 18-style byte-compiled function, there
627 may be a frame for Fbytecode at the top level. In any version of
628 Emacs there can be Fbytecode frames for subexpressions evaluated
629 inside catch and condition-case. Skip past them.
631 If this isn't a byte-compiled function, then we may now be
632 looking at several frames for special forms. Skip past them. */
634 && (EQ (*btp
->function
, Qbytecode
)
635 || btp
->nargs
== UNEVALLED
))
638 /* btp now points at the frame of the innermost function that isn't
639 a special form, ignoring frames for Finteractive_p and/or
640 Fbytecode at the top. If this frame is for a built-in function
641 (such as load or eval-region) return nil. */
642 fun
= Findirect_function (*btp
->function
, Qnil
);
643 if (exclude_subrs_p
&& SUBRP (fun
))
646 /* btp points to the frame of a Lisp function that called interactive-p.
647 Return t if that function was called interactively. */
648 if (btp
&& btp
->next
&& EQ (*btp
->next
->function
, Qcall_interactively
))
654 DEFUN ("defun", Fdefun
, Sdefun
, 2, UNEVALLED
, 0,
655 doc
: /* Define NAME as a function.
656 The definition is (lambda ARGLIST [DOCSTRING] BODY...).
657 See also the function `interactive'.
658 usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */)
662 register Lisp_Object fn_name
;
663 register Lisp_Object defn
;
665 fn_name
= Fcar (args
);
666 CHECK_SYMBOL (fn_name
);
667 defn
= Fcons (Qlambda
, Fcdr (args
));
668 if (!NILP (Vpurify_flag
))
669 defn
= Fpurecopy (defn
);
670 if (CONSP (XSYMBOL (fn_name
)->function
)
671 && EQ (XCAR (XSYMBOL (fn_name
)->function
), Qautoload
))
672 LOADHIST_ATTACH (Fcons (Qt
, fn_name
));
673 Ffset (fn_name
, defn
);
674 LOADHIST_ATTACH (Fcons (Qdefun
, fn_name
));
678 DEFUN ("defmacro", Fdefmacro
, Sdefmacro
, 2, UNEVALLED
, 0,
679 doc
: /* Define NAME as a macro.
680 The actual definition looks like
681 (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...).
682 When the macro is called, as in (NAME ARGS...),
683 the function (lambda ARGLIST BODY...) is applied to
684 the list ARGS... as it appears in the expression,
685 and the result should be a form to be evaluated instead of the original.
687 DECL is a declaration, optional, which can specify how to indent
688 calls to this macro, how Edebug should handle it, and which argument
689 should be treated as documentation. It looks like this:
691 The elements can look like this:
693 Set NAME's `lisp-indent-function' property to INDENT.
696 Set NAME's `edebug-form-spec' property to DEBUG. (This is
697 equivalent to writing a `def-edebug-spec' for the macro.)
700 Set NAME's `doc-string-elt' property to ELT.
702 usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */)
706 register Lisp_Object fn_name
;
707 register Lisp_Object defn
;
708 Lisp_Object lambda_list
, doc
, tail
;
710 fn_name
= Fcar (args
);
711 CHECK_SYMBOL (fn_name
);
712 lambda_list
= Fcar (Fcdr (args
));
713 tail
= Fcdr (Fcdr (args
));
716 if (STRINGP (Fcar (tail
)))
722 while (CONSP (Fcar (tail
))
723 && EQ (Fcar (Fcar (tail
)), Qdeclare
))
725 if (!NILP (Vmacro_declaration_function
))
729 call2 (Vmacro_declaration_function
, fn_name
, Fcar (tail
));
737 tail
= Fcons (lambda_list
, tail
);
739 tail
= Fcons (lambda_list
, Fcons (doc
, tail
));
740 defn
= Fcons (Qmacro
, Fcons (Qlambda
, tail
));
742 if (!NILP (Vpurify_flag
))
743 defn
= Fpurecopy (defn
);
744 if (CONSP (XSYMBOL (fn_name
)->function
)
745 && EQ (XCAR (XSYMBOL (fn_name
)->function
), Qautoload
))
746 LOADHIST_ATTACH (Fcons (Qt
, fn_name
));
747 Ffset (fn_name
, defn
);
748 LOADHIST_ATTACH (Fcons (Qdefun
, fn_name
));
753 DEFUN ("defvaralias", Fdefvaralias
, Sdefvaralias
, 2, 3, 0,
754 doc
: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE.
755 Aliased variables always have the same value; setting one sets the other.
756 Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is
757 omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE,
758 or of the variable at the end of the chain of aliases, if BASE-VARIABLE is
759 itself an alias. If NEW-ALIAS is bound, and BASE-VARIABLE is not,
760 then the value of BASE-VARIABLE is set to that of NEW-ALIAS.
761 The return value is BASE-VARIABLE. */)
762 (new_alias
, base_variable
, docstring
)
763 Lisp_Object new_alias
, base_variable
, docstring
;
765 struct Lisp_Symbol
*sym
;
767 CHECK_SYMBOL (new_alias
);
768 CHECK_SYMBOL (base_variable
);
770 sym
= XSYMBOL (new_alias
);
773 if (sym
->redirect
== SYMBOL_VARALIAS
)
774 sym
->constant
= 0; /* Reset. */
777 error ("Cannot make a constant an alias");
779 switch (sym
->redirect
)
781 case SYMBOL_FORWARDED
:
782 error ("Cannot make an internal variable an alias");
783 case SYMBOL_LOCALIZED
:
784 error ("Don't know how to make a localized variable an alias");
787 /* http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00834.html
788 If n_a is bound, but b_v is not, set the value of b_v to n_a,
789 so that old-code that affects n_a before the aliasing is setup
791 if (NILP (Fboundp (base_variable
)))
792 set_internal (base_variable
, find_symbol_value (new_alias
), NULL
, 1);
795 struct specbinding
*p
;
797 for (p
= specpdl_ptr
- 1; p
>= specpdl
; p
--)
800 CONSP (p
->symbol
) ? XCAR (p
->symbol
) : p
->symbol
)))
801 error ("Don't know how to make a let-bound variable an alias");
804 sym
->redirect
= SYMBOL_VARALIAS
;
805 SET_SYMBOL_ALIAS (sym
, XSYMBOL (base_variable
));
806 sym
->constant
= SYMBOL_CONSTANT_P (base_variable
);
807 LOADHIST_ATTACH (new_alias
);
808 /* Even if docstring is nil: remove old docstring. */
809 Fput (new_alias
, Qvariable_documentation
, docstring
);
811 return base_variable
;
815 DEFUN ("defvar", Fdefvar
, Sdefvar
, 1, UNEVALLED
, 0,
816 doc
: /* Define SYMBOL as a variable, and return SYMBOL.
817 You are not required to define a variable in order to use it,
818 but the definition can supply documentation and an initial value
819 in a way that tags can recognize.
821 INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.
822 If SYMBOL is buffer-local, its default value is what is set;
823 buffer-local values are not affected.
824 INITVALUE and DOCSTRING are optional.
825 If DOCSTRING starts with *, this variable is identified as a user option.
826 This means that M-x set-variable recognizes it.
827 See also `user-variable-p'.
828 If INITVALUE is missing, SYMBOL's value is not set.
830 If SYMBOL has a local binding, then this form affects the local
831 binding. This is usually not what you want. Thus, if you need to
832 load a file defining variables, with this form or with `defconst' or
833 `defcustom', you should always load that file _outside_ any bindings
834 for these variables. \(`defconst' and `defcustom' behave similarly in
836 usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */)
840 register Lisp_Object sym
, tem
, tail
;
844 if (!NILP (Fcdr (Fcdr (tail
))))
845 error ("Too many arguments");
847 tem
= Fdefault_boundp (sym
);
850 if (SYMBOL_CONSTANT_P (sym
))
852 /* For upward compatibility, allow (defvar :foo (quote :foo)). */
853 Lisp_Object tem
= Fcar (tail
);
855 && EQ (XCAR (tem
), Qquote
)
856 && CONSP (XCDR (tem
))
857 && EQ (XCAR (XCDR (tem
)), sym
)))
858 error ("Constant symbol `%s' specified in defvar",
859 SDATA (SYMBOL_NAME (sym
)));
863 Fset_default (sym
, Feval (Fcar (tail
)));
865 { /* Check if there is really a global binding rather than just a let
866 binding that shadows the global unboundness of the var. */
867 volatile struct specbinding
*pdl
= specpdl_ptr
;
868 while (--pdl
>= specpdl
)
870 if (EQ (pdl
->symbol
, sym
) && !pdl
->func
871 && EQ (pdl
->old_value
, Qunbound
))
873 message_with_string ("Warning: defvar ignored because %s is let-bound",
874 SYMBOL_NAME (sym
), 1);
883 if (!NILP (Vpurify_flag
))
884 tem
= Fpurecopy (tem
);
885 Fput (sym
, Qvariable_documentation
, tem
);
887 LOADHIST_ATTACH (sym
);
890 /* Simple (defvar <var>) should not count as a definition at all.
891 It could get in the way of other definitions, and unloading this
892 package could try to make the variable unbound. */
898 DEFUN ("defconst", Fdefconst
, Sdefconst
, 2, UNEVALLED
, 0,
899 doc
: /* Define SYMBOL as a constant variable.
900 The intent is that neither programs nor users should ever change this value.
901 Always sets the value of SYMBOL to the result of evalling INITVALUE.
902 If SYMBOL is buffer-local, its default value is what is set;
903 buffer-local values are not affected.
904 DOCSTRING is optional.
906 If SYMBOL has a local binding, then this form sets the local binding's
907 value. However, you should normally not make local bindings for
908 variables defined with this form.
909 usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */)
913 register Lisp_Object sym
, tem
;
916 if (!NILP (Fcdr (Fcdr (Fcdr (args
)))))
917 error ("Too many arguments");
919 tem
= Feval (Fcar (Fcdr (args
)));
920 if (!NILP (Vpurify_flag
))
921 tem
= Fpurecopy (tem
);
922 Fset_default (sym
, tem
);
923 tem
= Fcar (Fcdr (Fcdr (args
)));
926 if (!NILP (Vpurify_flag
))
927 tem
= Fpurecopy (tem
);
928 Fput (sym
, Qvariable_documentation
, tem
);
930 Fput (sym
, Qrisky_local_variable
, Qt
);
931 LOADHIST_ATTACH (sym
);
935 /* Error handler used in Fuser_variable_p. */
937 user_variable_p_eh (ignore
)
944 lisp_indirect_variable (Lisp_Object sym
)
946 XSETSYMBOL (sym
, indirect_variable (XSYMBOL (sym
)));
950 DEFUN ("user-variable-p", Fuser_variable_p
, Suser_variable_p
, 1, 1, 0,
951 doc
: /* Return t if VARIABLE is intended to be set and modified by users.
952 \(The alternative is a variable used internally in a Lisp program.)
953 A variable is a user variable if
954 \(1) the first character of its documentation is `*', or
955 \(2) it is customizable (its property list contains a non-nil value
956 of `standard-value' or `custom-autoload'), or
957 \(3) it is an alias for another user variable.
958 Return nil if VARIABLE is an alias and there is a loop in the
959 chain of symbols. */)
961 Lisp_Object variable
;
963 Lisp_Object documentation
;
965 if (!SYMBOLP (variable
))
968 /* If indirect and there's an alias loop, don't check anything else. */
969 if (XSYMBOL (variable
)->redirect
== SYMBOL_VARALIAS
970 && NILP (internal_condition_case_1 (lisp_indirect_variable
, variable
,
971 Qt
, user_variable_p_eh
)))
976 documentation
= Fget (variable
, Qvariable_documentation
);
977 if (INTEGERP (documentation
) && XINT (documentation
) < 0)
979 if (STRINGP (documentation
)
980 && ((unsigned char) SREF (documentation
, 0) == '*'))
982 /* If it is (STRING . INTEGER), a negative integer means a user variable. */
983 if (CONSP (documentation
)
984 && STRINGP (XCAR (documentation
))
985 && INTEGERP (XCDR (documentation
))
986 && XINT (XCDR (documentation
)) < 0)
988 /* Customizable? See `custom-variable-p'. */
989 if ((!NILP (Fget (variable
, intern ("standard-value"))))
990 || (!NILP (Fget (variable
, intern ("custom-autoload")))))
993 if (!(XSYMBOL (variable
)->redirect
== SYMBOL_VARALIAS
))
996 /* An indirect variable? Let's follow the chain. */
997 XSETSYMBOL (variable
, SYMBOL_ALIAS (XSYMBOL (variable
)));
1001 DEFUN ("let*", FletX
, SletX
, 1, UNEVALLED
, 0,
1002 doc
: /* Bind variables according to VARLIST then eval BODY.
1003 The value of the last form in BODY is returned.
1004 Each element of VARLIST is a symbol (which is bound to nil)
1005 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
1006 Each VALUEFORM can refer to the symbols already bound by this VARLIST.
1007 usage: (let* VARLIST BODY...) */)
1011 Lisp_Object varlist
, val
, elt
;
1012 int count
= SPECPDL_INDEX ();
1013 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1015 GCPRO3 (args
, elt
, varlist
);
1017 varlist
= Fcar (args
);
1018 while (!NILP (varlist
))
1021 elt
= Fcar (varlist
);
1023 specbind (elt
, Qnil
);
1024 else if (! NILP (Fcdr (Fcdr (elt
))))
1025 signal_error ("`let' bindings can have only one value-form", elt
);
1028 val
= Feval (Fcar (Fcdr (elt
)));
1029 specbind (Fcar (elt
), val
);
1031 varlist
= Fcdr (varlist
);
1034 val
= Fprogn (Fcdr (args
));
1035 return unbind_to (count
, val
);
1038 DEFUN ("let", Flet
, Slet
, 1, UNEVALLED
, 0,
1039 doc
: /* Bind variables according to VARLIST then eval BODY.
1040 The value of the last form in BODY is returned.
1041 Each element of VARLIST is a symbol (which is bound to nil)
1042 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
1043 All the VALUEFORMs are evalled before any symbols are bound.
1044 usage: (let VARLIST BODY...) */)
1048 Lisp_Object
*temps
, tem
;
1049 register Lisp_Object elt
, varlist
;
1050 int count
= SPECPDL_INDEX ();
1051 register int argnum
;
1052 struct gcpro gcpro1
, gcpro2
;
1054 varlist
= Fcar (args
);
1056 /* Make space to hold the values to give the bound variables */
1057 elt
= Flength (varlist
);
1058 temps
= (Lisp_Object
*) alloca (XFASTINT (elt
) * sizeof (Lisp_Object
));
1060 /* Compute the values and store them in `temps' */
1062 GCPRO2 (args
, *temps
);
1065 for (argnum
= 0; CONSP (varlist
); varlist
= XCDR (varlist
))
1068 elt
= XCAR (varlist
);
1070 temps
[argnum
++] = Qnil
;
1071 else if (! NILP (Fcdr (Fcdr (elt
))))
1072 signal_error ("`let' bindings can have only one value-form", elt
);
1074 temps
[argnum
++] = Feval (Fcar (Fcdr (elt
)));
1075 gcpro2
.nvars
= argnum
;
1079 varlist
= Fcar (args
);
1080 for (argnum
= 0; CONSP (varlist
); varlist
= XCDR (varlist
))
1082 elt
= XCAR (varlist
);
1083 tem
= temps
[argnum
++];
1085 specbind (elt
, tem
);
1087 specbind (Fcar (elt
), tem
);
1090 elt
= Fprogn (Fcdr (args
));
1091 return unbind_to (count
, elt
);
1094 DEFUN ("while", Fwhile
, Swhile
, 1, UNEVALLED
, 0,
1095 doc
: /* If TEST yields non-nil, eval BODY... and repeat.
1096 The order of execution is thus TEST, BODY, TEST, BODY and so on
1097 until TEST returns nil.
1098 usage: (while TEST BODY...) */)
1102 Lisp_Object test
, body
;
1103 struct gcpro gcpro1
, gcpro2
;
1105 GCPRO2 (test
, body
);
1109 while (!NILP (Feval (test
)))
1119 DEFUN ("macroexpand", Fmacroexpand
, Smacroexpand
, 1, 2, 0,
1120 doc
: /* Return result of expanding macros at top level of FORM.
1121 If FORM is not a macro call, it is returned unchanged.
1122 Otherwise, the macro is expanded and the expansion is considered
1123 in place of FORM. When a non-macro-call results, it is returned.
1125 The second optional arg ENVIRONMENT specifies an environment of macro
1126 definitions to shadow the loaded ones for use in file byte-compilation. */)
1129 Lisp_Object environment
;
1131 /* With cleanups from Hallvard Furuseth. */
1132 register Lisp_Object expander
, sym
, def
, tem
;
1136 /* Come back here each time we expand a macro call,
1137 in case it expands into another macro call. */
1140 /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */
1141 def
= sym
= XCAR (form
);
1143 /* Trace symbols aliases to other symbols
1144 until we get a symbol that is not an alias. */
1145 while (SYMBOLP (def
))
1149 tem
= Fassq (sym
, environment
);
1152 def
= XSYMBOL (sym
)->function
;
1153 if (!EQ (def
, Qunbound
))
1158 /* Right now TEM is the result from SYM in ENVIRONMENT,
1159 and if TEM is nil then DEF is SYM's function definition. */
1162 /* SYM is not mentioned in ENVIRONMENT.
1163 Look at its function definition. */
1164 if (EQ (def
, Qunbound
) || !CONSP (def
))
1165 /* Not defined or definition not suitable */
1167 if (EQ (XCAR (def
), Qautoload
))
1169 /* Autoloading function: will it be a macro when loaded? */
1170 tem
= Fnth (make_number (4), def
);
1171 if (EQ (tem
, Qt
) || EQ (tem
, Qmacro
))
1172 /* Yes, load it and try again. */
1174 struct gcpro gcpro1
;
1176 do_autoload (def
, sym
);
1183 else if (!EQ (XCAR (def
), Qmacro
))
1185 else expander
= XCDR (def
);
1189 expander
= XCDR (tem
);
1190 if (NILP (expander
))
1193 form
= apply1 (expander
, XCDR (form
));
1198 DEFUN ("catch", Fcatch
, Scatch
, 1, UNEVALLED
, 0,
1199 doc
: /* Eval BODY allowing nonlocal exits using `throw'.
1200 TAG is evalled to get the tag to use; it must not be nil.
1202 Then the BODY is executed.
1203 Within BODY, a call to `throw' with the same TAG exits BODY and this `catch'.
1204 If no throw happens, `catch' returns the value of the last BODY form.
1205 If a throw happens, it specifies the value to return from `catch'.
1206 usage: (catch TAG BODY...) */)
1210 register Lisp_Object tag
;
1211 struct gcpro gcpro1
;
1214 tag
= Feval (Fcar (args
));
1216 return internal_catch (tag
, Fprogn
, Fcdr (args
));
1219 /* Set up a catch, then call C function FUNC on argument ARG.
1220 FUNC should return a Lisp_Object.
1221 This is how catches are done from within C code. */
1224 internal_catch (tag
, func
, arg
)
1226 Lisp_Object (*func
) ();
1229 /* This structure is made part of the chain `catchlist'. */
1232 /* Fill in the components of c, and put it on the list. */
1236 c
.backlist
= backtrace_list
;
1237 c
.handlerlist
= handlerlist
;
1238 c
.lisp_eval_depth
= lisp_eval_depth
;
1239 c
.pdlcount
= SPECPDL_INDEX ();
1240 c
.poll_suppress_count
= poll_suppress_count
;
1241 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1242 c
.gcpro
= gcprolist
;
1243 c
.byte_stack
= byte_stack_list
;
1247 if (! _setjmp (c
.jmp
))
1248 c
.val
= (*func
) (arg
);
1250 /* Throw works by a longjmp that comes right here. */
1255 /* Unwind the specbind, catch, and handler stacks back to CATCH, and
1256 jump to that CATCH, returning VALUE as the value of that catch.
1258 This is the guts Fthrow and Fsignal; they differ only in the way
1259 they choose the catch tag to throw to. A catch tag for a
1260 condition-case form has a TAG of Qnil.
1262 Before each catch is discarded, unbind all special bindings and
1263 execute all unwind-protect clauses made above that catch. Unwind
1264 the handler stack as we go, so that the proper handlers are in
1265 effect for each unwind-protect clause we run. At the end, restore
1266 some static info saved in CATCH, and longjmp to the location
1269 This is used for correct unwinding in Fthrow and Fsignal. */
1272 unwind_to_catch (catch, value
)
1273 struct catchtag
*catch;
1276 register int last_time
;
1278 /* Save the value in the tag. */
1281 /* Restore certain special C variables. */
1282 set_poll_suppress_count (catch->poll_suppress_count
);
1283 UNBLOCK_INPUT_TO (catch->interrupt_input_blocked
);
1284 handling_signal
= 0;
1289 last_time
= catchlist
== catch;
1291 /* Unwind the specpdl stack, and then restore the proper set of
1293 unbind_to (catchlist
->pdlcount
, Qnil
);
1294 handlerlist
= catchlist
->handlerlist
;
1295 catchlist
= catchlist
->next
;
1297 while (! last_time
);
1300 /* If x_catch_errors was done, turn it off now.
1301 (First we give unbind_to a chance to do that.) */
1302 #if 0 /* This would disable x_catch_errors after x_connection_closed.
1303 * The catch must remain in effect during that delicate
1304 * state. --lorentey */
1305 x_fully_uncatch_errors ();
1309 byte_stack_list
= catch->byte_stack
;
1310 gcprolist
= catch->gcpro
;
1313 gcpro_level
= gcprolist
->level
+ 1;
1317 backtrace_list
= catch->backlist
;
1318 lisp_eval_depth
= catch->lisp_eval_depth
;
1320 _longjmp (catch->jmp
, 1);
1323 DEFUN ("throw", Fthrow
, Sthrow
, 2, 2, 0,
1324 doc
: /* Throw to the catch for TAG and return VALUE from it.
1325 Both TAG and VALUE are evalled. */)
1327 register Lisp_Object tag
, value
;
1329 register struct catchtag
*c
;
1332 for (c
= catchlist
; c
; c
= c
->next
)
1334 if (EQ (c
->tag
, tag
))
1335 unwind_to_catch (c
, value
);
1337 xsignal2 (Qno_catch
, tag
, value
);
1341 DEFUN ("unwind-protect", Funwind_protect
, Sunwind_protect
, 1, UNEVALLED
, 0,
1342 doc
: /* Do BODYFORM, protecting with UNWINDFORMS.
1343 If BODYFORM completes normally, its value is returned
1344 after executing the UNWINDFORMS.
1345 If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.
1346 usage: (unwind-protect BODYFORM UNWINDFORMS...) */)
1351 int count
= SPECPDL_INDEX ();
1353 record_unwind_protect (Fprogn
, Fcdr (args
));
1354 val
= Feval (Fcar (args
));
1355 return unbind_to (count
, val
);
1358 /* Chain of condition handlers currently in effect.
1359 The elements of this chain are contained in the stack frames
1360 of Fcondition_case and internal_condition_case.
1361 When an error is signaled (by calling Fsignal, below),
1362 this chain is searched for an element that applies. */
1364 struct handler
*handlerlist
;
1366 DEFUN ("condition-case", Fcondition_case
, Scondition_case
, 2, UNEVALLED
, 0,
1367 doc
: /* Regain control when an error is signaled.
1368 Executes BODYFORM and returns its value if no error happens.
1369 Each element of HANDLERS looks like (CONDITION-NAME BODY...)
1370 where the BODY is made of Lisp expressions.
1372 A handler is applicable to an error
1373 if CONDITION-NAME is one of the error's condition names.
1374 If an error happens, the first applicable handler is run.
1376 The car of a handler may be a list of condition names
1377 instead of a single condition name. Then it handles all of them.
1379 When a handler handles an error, control returns to the `condition-case'
1380 and it executes the handler's BODY...
1381 with VAR bound to (ERROR-SYMBOL . SIGNAL-DATA) from the error.
1382 (If VAR is nil, the handler can't access that information.)
1383 Then the value of the last BODY form is returned from the `condition-case'
1386 See also the function `signal' for more info.
1387 usage: (condition-case VAR BODYFORM &rest HANDLERS) */)
1391 register Lisp_Object bodyform
, handlers
;
1392 volatile Lisp_Object var
;
1395 bodyform
= Fcar (Fcdr (args
));
1396 handlers
= Fcdr (Fcdr (args
));
1398 return internal_lisp_condition_case (var
, bodyform
, handlers
);
1401 /* Like Fcondition_case, but the args are separate
1402 rather than passed in a list. Used by Fbyte_code. */
1405 internal_lisp_condition_case (var
, bodyform
, handlers
)
1406 volatile Lisp_Object var
;
1407 Lisp_Object bodyform
, handlers
;
1415 for (val
= handlers
; CONSP (val
); val
= XCDR (val
))
1421 && (SYMBOLP (XCAR (tem
))
1422 || CONSP (XCAR (tem
))))))
1423 error ("Invalid condition handler", tem
);
1428 c
.backlist
= backtrace_list
;
1429 c
.handlerlist
= handlerlist
;
1430 c
.lisp_eval_depth
= lisp_eval_depth
;
1431 c
.pdlcount
= SPECPDL_INDEX ();
1432 c
.poll_suppress_count
= poll_suppress_count
;
1433 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1434 c
.gcpro
= gcprolist
;
1435 c
.byte_stack
= byte_stack_list
;
1436 if (_setjmp (c
.jmp
))
1439 specbind (h
.var
, c
.val
);
1440 val
= Fprogn (Fcdr (h
.chosen_clause
));
1442 /* Note that this just undoes the binding of h.var; whoever
1443 longjumped to us unwound the stack to c.pdlcount before
1445 unbind_to (c
.pdlcount
, Qnil
);
1452 h
.handler
= handlers
;
1453 h
.next
= handlerlist
;
1457 val
= Feval (bodyform
);
1459 handlerlist
= h
.next
;
1463 /* Call the function BFUN with no arguments, catching errors within it
1464 according to HANDLERS. If there is an error, call HFUN with
1465 one argument which is the data that describes the error:
1468 HANDLERS can be a list of conditions to catch.
1469 If HANDLERS is Qt, catch all errors.
1470 If HANDLERS is Qerror, catch all errors
1471 but allow the debugger to run if that is enabled. */
1474 internal_condition_case (bfun
, handlers
, hfun
)
1475 Lisp_Object (*bfun
) ();
1476 Lisp_Object handlers
;
1477 Lisp_Object (*hfun
) ();
1483 /* Since Fsignal will close off all calls to x_catch_errors,
1484 we will get the wrong results if some are not closed now. */
1486 if (x_catching_errors ())
1492 c
.backlist
= backtrace_list
;
1493 c
.handlerlist
= handlerlist
;
1494 c
.lisp_eval_depth
= lisp_eval_depth
;
1495 c
.pdlcount
= SPECPDL_INDEX ();
1496 c
.poll_suppress_count
= poll_suppress_count
;
1497 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1498 c
.gcpro
= gcprolist
;
1499 c
.byte_stack
= byte_stack_list
;
1500 if (_setjmp (c
.jmp
))
1502 return (*hfun
) (c
.val
);
1506 h
.handler
= handlers
;
1508 h
.next
= handlerlist
;
1514 handlerlist
= h
.next
;
1518 /* Like internal_condition_case but call BFUN with ARG as its argument. */
1521 internal_condition_case_1 (bfun
, arg
, handlers
, hfun
)
1522 Lisp_Object (*bfun
) ();
1524 Lisp_Object handlers
;
1525 Lisp_Object (*hfun
) ();
1531 /* Since Fsignal will close off all calls to x_catch_errors,
1532 we will get the wrong results if some are not closed now. */
1534 if (x_catching_errors ())
1540 c
.backlist
= backtrace_list
;
1541 c
.handlerlist
= handlerlist
;
1542 c
.lisp_eval_depth
= lisp_eval_depth
;
1543 c
.pdlcount
= SPECPDL_INDEX ();
1544 c
.poll_suppress_count
= poll_suppress_count
;
1545 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1546 c
.gcpro
= gcprolist
;
1547 c
.byte_stack
= byte_stack_list
;
1548 if (_setjmp (c
.jmp
))
1550 return (*hfun
) (c
.val
);
1554 h
.handler
= handlers
;
1556 h
.next
= handlerlist
;
1560 val
= (*bfun
) (arg
);
1562 handlerlist
= h
.next
;
1567 /* Like internal_condition_case but call BFUN with NARGS as first,
1568 and ARGS as second argument. */
1571 internal_condition_case_2 (bfun
, nargs
, args
, handlers
, hfun
)
1572 Lisp_Object (*bfun
) ();
1575 Lisp_Object handlers
;
1576 Lisp_Object (*hfun
) ();
1582 /* Since Fsignal will close off all calls to x_catch_errors,
1583 we will get the wrong results if some are not closed now. */
1585 if (x_catching_errors ())
1591 c
.backlist
= backtrace_list
;
1592 c
.handlerlist
= handlerlist
;
1593 c
.lisp_eval_depth
= lisp_eval_depth
;
1594 c
.pdlcount
= SPECPDL_INDEX ();
1595 c
.poll_suppress_count
= poll_suppress_count
;
1596 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1597 c
.gcpro
= gcprolist
;
1598 c
.byte_stack
= byte_stack_list
;
1599 if (_setjmp (c
.jmp
))
1601 return (*hfun
) (c
.val
);
1605 h
.handler
= handlers
;
1607 h
.next
= handlerlist
;
1611 val
= (*bfun
) (nargs
, args
);
1613 handlerlist
= h
.next
;
1618 static Lisp_Object find_handler_clause
P_ ((Lisp_Object
, Lisp_Object
,
1619 Lisp_Object
, Lisp_Object
));
1621 DEFUN ("signal", Fsignal
, Ssignal
, 2, 2, 0,
1622 doc
: /* Signal an error. Args are ERROR-SYMBOL and associated DATA.
1623 This function does not return.
1625 An error symbol is a symbol with an `error-conditions' property
1626 that is a list of condition names.
1627 A handler for any of those names will get to handle this signal.
1628 The symbol `error' should normally be one of them.
1630 DATA should be a list. Its elements are printed as part of the error message.
1631 See Info anchor `(elisp)Definition of signal' for some details on how this
1632 error message is constructed.
1633 If the signal is handled, DATA is made available to the handler.
1634 See also the function `condition-case'. */)
1635 (error_symbol
, data
)
1636 Lisp_Object error_symbol
, data
;
1638 /* When memory is full, ERROR-SYMBOL is nil,
1639 and DATA is (REAL-ERROR-SYMBOL . REAL-DATA).
1640 That is a special case--don't do this in other situations. */
1641 register struct handler
*allhandlers
= handlerlist
;
1642 Lisp_Object conditions
;
1643 extern int gc_in_progress
;
1644 extern int waiting_for_input
;
1646 Lisp_Object real_error_symbol
;
1647 struct backtrace
*bp
;
1649 immediate_quit
= handling_signal
= 0;
1651 if (gc_in_progress
|| waiting_for_input
)
1654 if (NILP (error_symbol
))
1655 real_error_symbol
= Fcar (data
);
1657 real_error_symbol
= error_symbol
;
1659 #if 0 /* rms: I don't know why this was here,
1660 but it is surely wrong for an error that is handled. */
1661 #ifdef HAVE_WINDOW_SYSTEM
1662 if (display_hourglass_p
)
1663 cancel_hourglass ();
1667 /* This hook is used by edebug. */
1668 if (! NILP (Vsignal_hook_function
)
1669 && ! NILP (error_symbol
))
1671 /* Edebug takes care of restoring these variables when it exits. */
1672 if (lisp_eval_depth
+ 20 > max_lisp_eval_depth
)
1673 max_lisp_eval_depth
= lisp_eval_depth
+ 20;
1675 if (SPECPDL_INDEX () + 40 > max_specpdl_size
)
1676 max_specpdl_size
= SPECPDL_INDEX () + 40;
1678 call2 (Vsignal_hook_function
, error_symbol
, data
);
1681 conditions
= Fget (real_error_symbol
, Qerror_conditions
);
1683 /* Remember from where signal was called. Skip over the frame for
1684 `signal' itself. If a frame for `error' follows, skip that,
1685 too. Don't do this when ERROR_SYMBOL is nil, because that
1686 is a memory-full error. */
1687 Vsignaling_function
= Qnil
;
1688 if (backtrace_list
&& !NILP (error_symbol
))
1690 bp
= backtrace_list
->next
;
1691 if (bp
&& bp
->function
&& EQ (*bp
->function
, Qerror
))
1693 if (bp
&& bp
->function
)
1694 Vsignaling_function
= *bp
->function
;
1697 for (; handlerlist
; handlerlist
= handlerlist
->next
)
1699 register Lisp_Object clause
;
1701 clause
= find_handler_clause (handlerlist
->handler
, conditions
,
1702 error_symbol
, data
);
1704 if (EQ (clause
, Qlambda
))
1706 /* We can't return values to code which signaled an error, but we
1707 can continue code which has signaled a quit. */
1708 if (EQ (real_error_symbol
, Qquit
))
1711 error ("Cannot return from the debugger in an error");
1716 Lisp_Object unwind_data
;
1717 struct handler
*h
= handlerlist
;
1719 handlerlist
= allhandlers
;
1721 if (NILP (error_symbol
))
1724 unwind_data
= Fcons (error_symbol
, data
);
1725 h
->chosen_clause
= clause
;
1726 unwind_to_catch (h
->tag
, unwind_data
);
1730 handlerlist
= allhandlers
;
1731 /* If no handler is present now, try to run the debugger,
1732 and if that fails, throw to top level. */
1733 find_handler_clause (Qerror
, conditions
, error_symbol
, data
);
1735 Fthrow (Qtop_level
, Qt
);
1737 if (! NILP (error_symbol
))
1738 data
= Fcons (error_symbol
, data
);
1740 string
= Ferror_message_string (data
);
1741 fatal ("%s", SDATA (string
), 0);
1744 /* Internal version of Fsignal that never returns.
1745 Used for anything but Qquit (which can return from Fsignal). */
1748 xsignal (error_symbol
, data
)
1749 Lisp_Object error_symbol
, data
;
1751 Fsignal (error_symbol
, data
);
1755 /* Like xsignal, but takes 0, 1, 2, or 3 args instead of a list. */
1758 xsignal0 (error_symbol
)
1759 Lisp_Object error_symbol
;
1761 xsignal (error_symbol
, Qnil
);
1765 xsignal1 (error_symbol
, arg
)
1766 Lisp_Object error_symbol
, arg
;
1768 xsignal (error_symbol
, list1 (arg
));
1772 xsignal2 (error_symbol
, arg1
, arg2
)
1773 Lisp_Object error_symbol
, arg1
, arg2
;
1775 xsignal (error_symbol
, list2 (arg1
, arg2
));
1779 xsignal3 (error_symbol
, arg1
, arg2
, arg3
)
1780 Lisp_Object error_symbol
, arg1
, arg2
, arg3
;
1782 xsignal (error_symbol
, list3 (arg1
, arg2
, arg3
));
1785 /* Signal `error' with message S, and additional arg ARG.
1786 If ARG is not a genuine list, make it a one-element list. */
1789 signal_error (s
, arg
)
1793 Lisp_Object tortoise
, hare
;
1795 hare
= tortoise
= arg
;
1796 while (CONSP (hare
))
1803 tortoise
= XCDR (tortoise
);
1805 if (EQ (hare
, tortoise
))
1810 arg
= Fcons (arg
, Qnil
); /* Make it a list. */
1812 xsignal (Qerror
, Fcons (build_string (s
), arg
));
1816 /* Return nonzero if LIST is a non-nil atom or
1817 a list containing one of CONDITIONS. */
1820 wants_debugger (list
, conditions
)
1821 Lisp_Object list
, conditions
;
1828 while (CONSP (conditions
))
1830 Lisp_Object
this, tail
;
1831 this = XCAR (conditions
);
1832 for (tail
= list
; CONSP (tail
); tail
= XCDR (tail
))
1833 if (EQ (XCAR (tail
), this))
1835 conditions
= XCDR (conditions
);
1840 /* Return 1 if an error with condition-symbols CONDITIONS,
1841 and described by SIGNAL-DATA, should skip the debugger
1842 according to debugger-ignored-errors. */
1845 skip_debugger (conditions
, data
)
1846 Lisp_Object conditions
, data
;
1849 int first_string
= 1;
1850 Lisp_Object error_message
;
1852 error_message
= Qnil
;
1853 for (tail
= Vdebug_ignored_errors
; CONSP (tail
); tail
= XCDR (tail
))
1855 if (STRINGP (XCAR (tail
)))
1859 error_message
= Ferror_message_string (data
);
1863 if (fast_string_match (XCAR (tail
), error_message
) >= 0)
1868 Lisp_Object contail
;
1870 for (contail
= conditions
; CONSP (contail
); contail
= XCDR (contail
))
1871 if (EQ (XCAR (tail
), XCAR (contail
)))
1879 /* Call the debugger if calling it is currently enabled for CONDITIONS.
1880 SIG and DATA describe the signal, as in find_handler_clause. */
1883 maybe_call_debugger (conditions
, sig
, data
)
1884 Lisp_Object conditions
, sig
, data
;
1886 Lisp_Object combined_data
;
1888 combined_data
= Fcons (sig
, data
);
1891 /* Don't try to run the debugger with interrupts blocked.
1892 The editing loop would return anyway. */
1894 /* Does user want to enter debugger for this kind of error? */
1897 : wants_debugger (Vdebug_on_error
, conditions
))
1898 && ! skip_debugger (conditions
, combined_data
)
1899 /* rms: what's this for? */
1900 && when_entered_debugger
< num_nonmacro_input_events
)
1902 call_debugger (Fcons (Qerror
, Fcons (combined_data
, Qnil
)));
1909 /* Value of Qlambda means we have called debugger and user has continued.
1910 There are two ways to pass SIG and DATA:
1911 = SIG is the error symbol, and DATA is the rest of the data.
1912 = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
1913 This is for memory-full errors only.
1915 We need to increase max_specpdl_size temporarily around
1916 anything we do that can push on the specpdl, so as not to get
1917 a second error here in case we're handling specpdl overflow. */
1920 find_handler_clause (handlers
, conditions
, sig
, data
)
1921 Lisp_Object handlers
, conditions
, sig
, data
;
1923 register Lisp_Object h
;
1924 register Lisp_Object tem
;
1925 int debugger_called
= 0;
1926 int debugger_considered
= 0;
1928 /* t is used by handlers for all conditions, set up by C code. */
1929 if (EQ (handlers
, Qt
))
1932 /* Don't run the debugger for a memory-full error.
1933 (There is no room in memory to do that!) */
1935 debugger_considered
= 1;
1937 /* error is used similarly, but means print an error message
1938 and run the debugger if that is enabled. */
1939 if (EQ (handlers
, Qerror
)
1940 || !NILP (Vdebug_on_signal
)) /* This says call debugger even if
1941 there is a handler. */
1943 if (!NILP (sig
) && wants_debugger (Vstack_trace_on_error
, conditions
))
1945 max_lisp_eval_depth
+= 15;
1950 internal_with_output_to_temp_buffer
1952 (Lisp_Object (*) (Lisp_Object
)) Fbacktrace
,
1955 max_lisp_eval_depth
-= 15;
1958 if (!debugger_considered
)
1960 debugger_considered
= 1;
1961 debugger_called
= maybe_call_debugger (conditions
, sig
, data
);
1964 /* If there is no handler, return saying whether we ran the debugger. */
1965 if (EQ (handlers
, Qerror
))
1967 if (debugger_called
)
1973 for (h
= handlers
; CONSP (h
); h
= Fcdr (h
))
1975 Lisp_Object handler
, condit
;
1978 if (!CONSP (handler
))
1980 condit
= Fcar (handler
);
1981 /* Handle a single condition name in handler HANDLER. */
1982 if (SYMBOLP (condit
))
1984 tem
= Fmemq (Fcar (handler
), conditions
);
1988 /* Handle a list of condition names in handler HANDLER. */
1989 else if (CONSP (condit
))
1992 for (tail
= condit
; CONSP (tail
); tail
= XCDR (tail
))
1994 tem
= Fmemq (Fcar (tail
), conditions
);
1997 /* This handler is going to apply.
1998 Does it allow the debugger to run first? */
1999 if (! debugger_considered
&& !NILP (Fmemq (Qdebug
, condit
)))
2000 maybe_call_debugger (conditions
, sig
, data
);
2010 /* dump an error message; called like printf */
2014 error (m
, a1
, a2
, a3
)
2034 int used
= doprnt (buffer
, size
, m
, m
+ mlen
, 3, args
);
2039 buffer
= (char *) xrealloc (buffer
, size
);
2042 buffer
= (char *) xmalloc (size
);
2047 string
= build_string (buffer
);
2051 xsignal1 (Qerror
, string
);
2054 DEFUN ("commandp", Fcommandp
, Scommandp
, 1, 2, 0,
2055 doc
: /* Non-nil if FUNCTION makes provisions for interactive calling.
2056 This means it contains a description for how to read arguments to give it.
2057 The value is nil for an invalid function or a symbol with no function
2060 Interactively callable functions include strings and vectors (treated
2061 as keyboard macros), lambda-expressions that contain a top-level call
2062 to `interactive', autoload definitions made by `autoload' with non-nil
2063 fourth argument, and some of the built-in functions of Lisp.
2065 Also, a symbol satisfies `commandp' if its function definition does so.
2067 If the optional argument FOR-CALL-INTERACTIVELY is non-nil,
2068 then strings and vectors are not accepted. */)
2069 (function
, for_call_interactively
)
2070 Lisp_Object function
, for_call_interactively
;
2072 register Lisp_Object fun
;
2073 register Lisp_Object funcar
;
2074 Lisp_Object if_prop
= Qnil
;
2078 fun
= indirect_function (fun
); /* Check cycles. */
2079 if (NILP (fun
) || EQ (fun
, Qunbound
))
2082 /* Check an `interactive-form' property if present, analogous to the
2083 function-documentation property. */
2085 while (SYMBOLP (fun
))
2087 Lisp_Object tmp
= Fget (fun
, Qinteractive_form
);
2090 fun
= Fsymbol_function (fun
);
2093 /* Emacs primitives are interactive if their DEFUN specifies an
2094 interactive spec. */
2096 return XSUBR (fun
)->intspec
? Qt
: if_prop
;
2098 /* Bytecode objects are interactive if they are long enough to
2099 have an element whose index is COMPILED_INTERACTIVE, which is
2100 where the interactive spec is stored. */
2101 else if (COMPILEDP (fun
))
2102 return ((ASIZE (fun
) & PSEUDOVECTOR_SIZE_MASK
) > COMPILED_INTERACTIVE
2105 /* Strings and vectors are keyboard macros. */
2106 if (STRINGP (fun
) || VECTORP (fun
))
2107 return (NILP (for_call_interactively
) ? Qt
: Qnil
);
2109 /* Lists may represent commands. */
2112 funcar
= XCAR (fun
);
2113 if (EQ (funcar
, Qlambda
))
2114 return !NILP (Fassq (Qinteractive
, Fcdr (XCDR (fun
)))) ? Qt
: if_prop
;
2115 if (EQ (funcar
, Qautoload
))
2116 return !NILP (Fcar (Fcdr (Fcdr (XCDR (fun
))))) ? Qt
: if_prop
;
2121 DEFUN ("autoload", Fautoload
, Sautoload
, 2, 5, 0,
2122 doc
: /* Define FUNCTION to autoload from FILE.
2123 FUNCTION is a symbol; FILE is a file name string to pass to `load'.
2124 Third arg DOCSTRING is documentation for the function.
2125 Fourth arg INTERACTIVE if non-nil says function can be called interactively.
2126 Fifth arg TYPE indicates the type of the object:
2127 nil or omitted says FUNCTION is a function,
2128 `keymap' says FUNCTION is really a keymap, and
2129 `macro' or t says FUNCTION is really a macro.
2130 Third through fifth args give info about the real definition.
2131 They default to nil.
2132 If FUNCTION is already defined other than as an autoload,
2133 this does nothing and returns nil. */)
2134 (function
, file
, docstring
, interactive
, type
)
2135 Lisp_Object function
, file
, docstring
, interactive
, type
;
2137 CHECK_SYMBOL (function
);
2138 CHECK_STRING (file
);
2140 /* If function is defined and not as an autoload, don't override */
2141 if (!EQ (XSYMBOL (function
)->function
, Qunbound
)
2142 && !(CONSP (XSYMBOL (function
)->function
)
2143 && EQ (XCAR (XSYMBOL (function
)->function
), Qautoload
)))
2146 if (NILP (Vpurify_flag
))
2147 /* Only add entries after dumping, because the ones before are
2148 not useful and else we get loads of them from the loaddefs.el. */
2149 LOADHIST_ATTACH (Fcons (Qautoload
, function
));
2151 /* We don't want the docstring in purespace (instead,
2152 Snarf-documentation should (hopefully) overwrite it).
2153 We used to use 0 here, but that leads to accidental sharing in
2154 purecopy's hash-consing, so we use a (hopefully) unique integer
2156 docstring
= make_number (XHASH (function
));
2157 return Ffset (function
,
2158 Fpurecopy (list5 (Qautoload
, file
, docstring
,
2159 interactive
, type
)));
2163 un_autoload (oldqueue
)
2164 Lisp_Object oldqueue
;
2166 register Lisp_Object queue
, first
, second
;
2168 /* Queue to unwind is current value of Vautoload_queue.
2169 oldqueue is the shadowed value to leave in Vautoload_queue. */
2170 queue
= Vautoload_queue
;
2171 Vautoload_queue
= oldqueue
;
2172 while (CONSP (queue
))
2174 first
= XCAR (queue
);
2175 second
= Fcdr (first
);
2176 first
= Fcar (first
);
2177 if (EQ (first
, make_number (0)))
2180 Ffset (first
, second
);
2181 queue
= XCDR (queue
);
2186 /* Load an autoloaded function.
2187 FUNNAME is the symbol which is the function's name.
2188 FUNDEF is the autoload definition (a list). */
2191 do_autoload (fundef
, funname
)
2192 Lisp_Object fundef
, funname
;
2194 int count
= SPECPDL_INDEX ();
2196 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2198 /* This is to make sure that loadup.el gives a clear picture
2199 of what files are preloaded and when. */
2200 if (! NILP (Vpurify_flag
))
2201 error ("Attempt to autoload %s while preparing to dump",
2202 SDATA (SYMBOL_NAME (funname
)));
2205 CHECK_SYMBOL (funname
);
2206 GCPRO3 (fun
, funname
, fundef
);
2208 /* Preserve the match data. */
2209 record_unwind_save_match_data ();
2211 /* If autoloading gets an error (which includes the error of failing
2212 to define the function being called), we use Vautoload_queue
2213 to undo function definitions and `provide' calls made by
2214 the function. We do this in the specific case of autoloading
2215 because autoloading is not an explicit request "load this file",
2216 but rather a request to "call this function".
2218 The value saved here is to be restored into Vautoload_queue. */
2219 record_unwind_protect (un_autoload
, Vautoload_queue
);
2220 Vautoload_queue
= Qt
;
2221 Fload (Fcar (Fcdr (fundef
)), Qnil
, Qt
, Qnil
, Qt
);
2223 /* Once loading finishes, don't undo it. */
2224 Vautoload_queue
= Qt
;
2225 unbind_to (count
, Qnil
);
2227 fun
= Findirect_function (fun
, Qnil
);
2229 if (!NILP (Fequal (fun
, fundef
)))
2230 error ("Autoloading failed to define function %s",
2231 SDATA (SYMBOL_NAME (funname
)));
2236 DEFUN ("eval", Feval
, Seval
, 1, 1, 0,
2237 doc
: /* Evaluate FORM and return its value. */)
2241 Lisp_Object fun
, val
, original_fun
, original_args
;
2243 struct backtrace backtrace
;
2244 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2246 if (handling_signal
)
2250 return Fsymbol_value (form
);
2255 if ((consing_since_gc
> gc_cons_threshold
2256 && consing_since_gc
> gc_relative_threshold
)
2258 (!NILP (Vmemory_full
) && consing_since_gc
> memory_full_cons_threshold
))
2261 Fgarbage_collect ();
2265 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2267 if (max_lisp_eval_depth
< 100)
2268 max_lisp_eval_depth
= 100;
2269 if (lisp_eval_depth
> max_lisp_eval_depth
)
2270 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2273 original_fun
= Fcar (form
);
2274 original_args
= Fcdr (form
);
2276 backtrace
.next
= backtrace_list
;
2277 backtrace_list
= &backtrace
;
2278 backtrace
.function
= &original_fun
; /* This also protects them from gc */
2279 backtrace
.args
= &original_args
;
2280 backtrace
.nargs
= UNEVALLED
;
2281 backtrace
.evalargs
= 1;
2282 backtrace
.debug_on_exit
= 0;
2284 if (debug_on_next_call
)
2285 do_debug_on_call (Qt
);
2287 /* At this point, only original_fun and original_args
2288 have values that will be used below */
2291 /* Optimize for no indirection. */
2293 if (SYMBOLP (fun
) && !EQ (fun
, Qunbound
)
2294 && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2295 fun
= indirect_function (fun
);
2299 Lisp_Object numargs
;
2300 Lisp_Object argvals
[8];
2301 Lisp_Object args_left
;
2302 register int i
, maxargs
;
2304 args_left
= original_args
;
2305 numargs
= Flength (args_left
);
2309 if (XINT (numargs
) < XSUBR (fun
)->min_args
||
2310 (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< XINT (numargs
)))
2311 xsignal2 (Qwrong_number_of_arguments
, original_fun
, numargs
);
2313 if (XSUBR (fun
)->max_args
== UNEVALLED
)
2315 backtrace
.evalargs
= 0;
2316 val
= (*XSUBR (fun
)->function
) (args_left
);
2320 if (XSUBR (fun
)->max_args
== MANY
)
2322 /* Pass a vector of evaluated arguments */
2324 register int argnum
= 0;
2326 vals
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
2328 GCPRO3 (args_left
, fun
, fun
);
2332 while (!NILP (args_left
))
2334 vals
[argnum
++] = Feval (Fcar (args_left
));
2335 args_left
= Fcdr (args_left
);
2336 gcpro3
.nvars
= argnum
;
2339 backtrace
.args
= vals
;
2340 backtrace
.nargs
= XINT (numargs
);
2342 val
= (*XSUBR (fun
)->function
) (XINT (numargs
), vals
);
2347 GCPRO3 (args_left
, fun
, fun
);
2348 gcpro3
.var
= argvals
;
2351 maxargs
= XSUBR (fun
)->max_args
;
2352 for (i
= 0; i
< maxargs
; args_left
= Fcdr (args_left
))
2354 argvals
[i
] = Feval (Fcar (args_left
));
2360 backtrace
.args
= argvals
;
2361 backtrace
.nargs
= XINT (numargs
);
2366 val
= (*XSUBR (fun
)->function
) ();
2369 val
= (*XSUBR (fun
)->function
) (argvals
[0]);
2372 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1]);
2375 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
2379 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
2380 argvals
[2], argvals
[3]);
2383 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2384 argvals
[3], argvals
[4]);
2387 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2388 argvals
[3], argvals
[4], argvals
[5]);
2391 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2392 argvals
[3], argvals
[4], argvals
[5],
2397 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2398 argvals
[3], argvals
[4], argvals
[5],
2399 argvals
[6], argvals
[7]);
2403 /* Someone has created a subr that takes more arguments than
2404 is supported by this code. We need to either rewrite the
2405 subr to use a different argument protocol, or add more
2406 cases to this switch. */
2410 if (COMPILEDP (fun
))
2411 val
= apply_lambda (fun
, original_args
, 1);
2414 if (EQ (fun
, Qunbound
))
2415 xsignal1 (Qvoid_function
, original_fun
);
2417 xsignal1 (Qinvalid_function
, original_fun
);
2418 funcar
= XCAR (fun
);
2419 if (!SYMBOLP (funcar
))
2420 xsignal1 (Qinvalid_function
, original_fun
);
2421 if (EQ (funcar
, Qautoload
))
2423 do_autoload (fun
, original_fun
);
2426 if (EQ (funcar
, Qmacro
))
2427 val
= Feval (apply1 (Fcdr (fun
), original_args
));
2428 else if (EQ (funcar
, Qlambda
))
2429 val
= apply_lambda (fun
, original_args
, 1);
2431 xsignal1 (Qinvalid_function
, original_fun
);
2437 if (backtrace
.debug_on_exit
)
2438 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
2439 backtrace_list
= backtrace
.next
;
2444 DEFUN ("apply", Fapply
, Sapply
, 2, MANY
, 0,
2445 doc
: /* Call FUNCTION with our remaining args, using our last arg as list of args.
2446 Then return the value FUNCTION returns.
2447 Thus, (apply '+ 1 2 '(3 4)) returns 10.
2448 usage: (apply FUNCTION &rest ARGUMENTS) */)
2453 register int i
, numargs
;
2454 register Lisp_Object spread_arg
;
2455 register Lisp_Object
*funcall_args
;
2457 struct gcpro gcpro1
;
2461 spread_arg
= args
[nargs
- 1];
2462 CHECK_LIST (spread_arg
);
2464 numargs
= XINT (Flength (spread_arg
));
2467 return Ffuncall (nargs
- 1, args
);
2468 else if (numargs
== 1)
2470 args
[nargs
- 1] = XCAR (spread_arg
);
2471 return Ffuncall (nargs
, args
);
2474 numargs
+= nargs
- 2;
2476 /* Optimize for no indirection. */
2477 if (SYMBOLP (fun
) && !EQ (fun
, Qunbound
)
2478 && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2479 fun
= indirect_function (fun
);
2480 if (EQ (fun
, Qunbound
))
2482 /* Let funcall get the error */
2489 if (numargs
< XSUBR (fun
)->min_args
2490 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2491 goto funcall
; /* Let funcall get the error */
2492 else if (XSUBR (fun
)->max_args
> numargs
)
2494 /* Avoid making funcall cons up a yet another new vector of arguments
2495 by explicitly supplying nil's for optional values */
2496 funcall_args
= (Lisp_Object
*) alloca ((1 + XSUBR (fun
)->max_args
)
2497 * sizeof (Lisp_Object
));
2498 for (i
= numargs
; i
< XSUBR (fun
)->max_args
;)
2499 funcall_args
[++i
] = Qnil
;
2500 GCPRO1 (*funcall_args
);
2501 gcpro1
.nvars
= 1 + XSUBR (fun
)->max_args
;
2505 /* We add 1 to numargs because funcall_args includes the
2506 function itself as well as its arguments. */
2509 funcall_args
= (Lisp_Object
*) alloca ((1 + numargs
)
2510 * sizeof (Lisp_Object
));
2511 GCPRO1 (*funcall_args
);
2512 gcpro1
.nvars
= 1 + numargs
;
2515 bcopy (args
, funcall_args
, nargs
* sizeof (Lisp_Object
));
2516 /* Spread the last arg we got. Its first element goes in
2517 the slot that it used to occupy, hence this value of I. */
2519 while (!NILP (spread_arg
))
2521 funcall_args
[i
++] = XCAR (spread_arg
);
2522 spread_arg
= XCDR (spread_arg
);
2525 /* By convention, the caller needs to gcpro Ffuncall's args. */
2526 RETURN_UNGCPRO (Ffuncall (gcpro1
.nvars
, funcall_args
));
2529 /* Run hook variables in various ways. */
2531 enum run_hooks_condition
{to_completion
, until_success
, until_failure
};
2532 static Lisp_Object run_hook_with_args
P_ ((int, Lisp_Object
*,
2533 enum run_hooks_condition
));
2535 DEFUN ("run-hooks", Frun_hooks
, Srun_hooks
, 0, MANY
, 0,
2536 doc
: /* Run each hook in HOOKS.
2537 Each argument should be a symbol, a hook variable.
2538 These symbols are processed in the order specified.
2539 If a hook symbol has a non-nil value, that value may be a function
2540 or a list of functions to be called to run the hook.
2541 If the value is a function, it is called with no arguments.
2542 If it is a list, the elements are called, in order, with no arguments.
2544 Major modes should not use this function directly to run their mode
2545 hook; they should use `run-mode-hooks' instead.
2547 Do not use `make-local-variable' to make a hook variable buffer-local.
2548 Instead, use `add-hook' and specify t for the LOCAL argument.
2549 usage: (run-hooks &rest HOOKS) */)
2554 Lisp_Object hook
[1];
2557 for (i
= 0; i
< nargs
; i
++)
2560 run_hook_with_args (1, hook
, to_completion
);
2566 DEFUN ("run-hook-with-args", Frun_hook_with_args
,
2567 Srun_hook_with_args
, 1, MANY
, 0,
2568 doc
: /* Run HOOK with the specified arguments ARGS.
2569 HOOK should be a symbol, a hook variable. If HOOK has a non-nil
2570 value, that value may be a function or a list of functions to be
2571 called to run the hook. If the value is a function, it is called with
2572 the given arguments and its return value is returned. If it is a list
2573 of functions, those functions are called, in order,
2574 with the given arguments ARGS.
2575 It is best not to depend on the value returned by `run-hook-with-args',
2578 Do not use `make-local-variable' to make a hook variable buffer-local.
2579 Instead, use `add-hook' and specify t for the LOCAL argument.
2580 usage: (run-hook-with-args HOOK &rest ARGS) */)
2585 return run_hook_with_args (nargs
, args
, to_completion
);
2588 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success
,
2589 Srun_hook_with_args_until_success
, 1, MANY
, 0,
2590 doc
: /* Run HOOK with the specified arguments ARGS.
2591 HOOK should be a symbol, a hook variable. If HOOK has a non-nil
2592 value, that value may be a function or a list of functions to be
2593 called to run the hook. If the value is a function, it is called with
2594 the given arguments and its return value is returned.
2595 If it is a list of functions, those functions are called, in order,
2596 with the given arguments ARGS, until one of them
2597 returns a non-nil value. Then we return that value.
2598 However, if they all return nil, we return nil.
2600 Do not use `make-local-variable' to make a hook variable buffer-local.
2601 Instead, use `add-hook' and specify t for the LOCAL argument.
2602 usage: (run-hook-with-args-until-success HOOK &rest ARGS) */)
2607 return run_hook_with_args (nargs
, args
, until_success
);
2610 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure
,
2611 Srun_hook_with_args_until_failure
, 1, MANY
, 0,
2612 doc
: /* Run HOOK with the specified arguments ARGS.
2613 HOOK should be a symbol, a hook variable. If HOOK has a non-nil
2614 value, that value may be a function or a list of functions to be
2615 called to run the hook. If the value is a function, it is called with
2616 the given arguments and its return value is returned.
2617 If it is a list of functions, those functions are called, in order,
2618 with the given arguments ARGS, until one of them returns nil.
2619 Then we return nil. However, if they all return non-nil, we return non-nil.
2621 Do not use `make-local-variable' to make a hook variable buffer-local.
2622 Instead, use `add-hook' and specify t for the LOCAL argument.
2623 usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */)
2628 return run_hook_with_args (nargs
, args
, until_failure
);
2631 /* ARGS[0] should be a hook symbol.
2632 Call each of the functions in the hook value, passing each of them
2633 as arguments all the rest of ARGS (all NARGS - 1 elements).
2634 COND specifies a condition to test after each call
2635 to decide whether to stop.
2636 The caller (or its caller, etc) must gcpro all of ARGS,
2637 except that it isn't necessary to gcpro ARGS[0]. */
2640 run_hook_with_args (nargs
, args
, cond
)
2643 enum run_hooks_condition cond
;
2645 Lisp_Object sym
, val
, ret
;
2646 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2648 /* If we are dying or still initializing,
2649 don't do anything--it would probably crash if we tried. */
2650 if (NILP (Vrun_hooks
))
2654 val
= find_symbol_value (sym
);
2655 ret
= (cond
== until_failure
? Qt
: Qnil
);
2657 if (EQ (val
, Qunbound
) || NILP (val
))
2659 else if (!CONSP (val
) || EQ (XCAR (val
), Qlambda
))
2662 return Ffuncall (nargs
, args
);
2666 Lisp_Object globals
= Qnil
;
2667 GCPRO3 (sym
, val
, globals
);
2670 CONSP (val
) && ((cond
== to_completion
)
2671 || (cond
== until_success
? NILP (ret
)
2675 if (EQ (XCAR (val
), Qt
))
2677 /* t indicates this hook has a local binding;
2678 it means to run the global binding too. */
2679 globals
= Fdefault_value (sym
);
2680 if (NILP (globals
)) continue;
2682 if (!CONSP (globals
) || EQ (XCAR (globals
), Qlambda
))
2685 ret
= Ffuncall (nargs
, args
);
2690 CONSP (globals
) && ((cond
== to_completion
)
2691 || (cond
== until_success
? NILP (ret
)
2693 globals
= XCDR (globals
))
2695 args
[0] = XCAR (globals
);
2696 /* In a global value, t should not occur. If it does, we
2697 must ignore it to avoid an endless loop. */
2698 if (!EQ (args
[0], Qt
))
2699 ret
= Ffuncall (nargs
, args
);
2705 args
[0] = XCAR (val
);
2706 ret
= Ffuncall (nargs
, args
);
2715 /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual
2716 present value of that symbol.
2717 Call each element of FUNLIST,
2718 passing each of them the rest of ARGS.
2719 The caller (or its caller, etc) must gcpro all of ARGS,
2720 except that it isn't necessary to gcpro ARGS[0]. */
2723 run_hook_list_with_args (funlist
, nargs
, args
)
2724 Lisp_Object funlist
;
2730 Lisp_Object globals
;
2731 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2735 GCPRO3 (sym
, val
, globals
);
2737 for (val
= funlist
; CONSP (val
); val
= XCDR (val
))
2739 if (EQ (XCAR (val
), Qt
))
2741 /* t indicates this hook has a local binding;
2742 it means to run the global binding too. */
2744 for (globals
= Fdefault_value (sym
);
2746 globals
= XCDR (globals
))
2748 args
[0] = XCAR (globals
);
2749 /* In a global value, t should not occur. If it does, we
2750 must ignore it to avoid an endless loop. */
2751 if (!EQ (args
[0], Qt
))
2752 Ffuncall (nargs
, args
);
2757 args
[0] = XCAR (val
);
2758 Ffuncall (nargs
, args
);
2765 /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
2768 run_hook_with_args_2 (hook
, arg1
, arg2
)
2769 Lisp_Object hook
, arg1
, arg2
;
2771 Lisp_Object temp
[3];
2776 Frun_hook_with_args (3, temp
);
2779 /* Apply fn to arg */
2782 Lisp_Object fn
, arg
;
2784 struct gcpro gcpro1
;
2788 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2791 Lisp_Object args
[2];
2795 RETURN_UNGCPRO (Fapply (2, args
));
2799 /* Call function fn on no arguments */
2804 struct gcpro gcpro1
;
2807 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2810 /* Call function fn with 1 argument arg1 */
2814 Lisp_Object fn
, arg1
;
2816 struct gcpro gcpro1
;
2817 Lisp_Object args
[2];
2823 RETURN_UNGCPRO (Ffuncall (2, args
));
2826 /* Call function fn with 2 arguments arg1, arg2 */
2829 call2 (fn
, arg1
, arg2
)
2830 Lisp_Object fn
, arg1
, arg2
;
2832 struct gcpro gcpro1
;
2833 Lisp_Object args
[3];
2839 RETURN_UNGCPRO (Ffuncall (3, args
));
2842 /* Call function fn with 3 arguments arg1, arg2, arg3 */
2845 call3 (fn
, arg1
, arg2
, arg3
)
2846 Lisp_Object fn
, arg1
, arg2
, arg3
;
2848 struct gcpro gcpro1
;
2849 Lisp_Object args
[4];
2856 RETURN_UNGCPRO (Ffuncall (4, args
));
2859 /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */
2862 call4 (fn
, arg1
, arg2
, arg3
, arg4
)
2863 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
;
2865 struct gcpro gcpro1
;
2866 Lisp_Object args
[5];
2874 RETURN_UNGCPRO (Ffuncall (5, args
));
2877 /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */
2880 call5 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
)
2881 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
;
2883 struct gcpro gcpro1
;
2884 Lisp_Object args
[6];
2893 RETURN_UNGCPRO (Ffuncall (6, args
));
2896 /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */
2899 call6 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
)
2900 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
;
2902 struct gcpro gcpro1
;
2903 Lisp_Object args
[7];
2913 RETURN_UNGCPRO (Ffuncall (7, args
));
2916 /* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7 */
2919 call7 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
, arg7
)
2920 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
, arg7
;
2922 struct gcpro gcpro1
;
2923 Lisp_Object args
[8];
2934 RETURN_UNGCPRO (Ffuncall (8, args
));
2937 /* The caller should GCPRO all the elements of ARGS. */
2939 DEFUN ("funcall", Ffuncall
, Sfuncall
, 1, MANY
, 0,
2940 doc
: /* Call first argument as a function, passing remaining arguments to it.
2941 Return the value that function returns.
2942 Thus, (funcall 'cons 'x 'y) returns (x . y).
2943 usage: (funcall FUNCTION &rest ARGUMENTS) */)
2948 Lisp_Object fun
, original_fun
;
2950 int numargs
= nargs
- 1;
2951 Lisp_Object lisp_numargs
;
2953 struct backtrace backtrace
;
2954 register Lisp_Object
*internal_args
;
2958 if ((consing_since_gc
> gc_cons_threshold
2959 && consing_since_gc
> gc_relative_threshold
)
2961 (!NILP (Vmemory_full
) && consing_since_gc
> memory_full_cons_threshold
))
2962 Fgarbage_collect ();
2964 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2966 if (max_lisp_eval_depth
< 100)
2967 max_lisp_eval_depth
= 100;
2968 if (lisp_eval_depth
> max_lisp_eval_depth
)
2969 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2972 backtrace
.next
= backtrace_list
;
2973 backtrace_list
= &backtrace
;
2974 backtrace
.function
= &args
[0];
2975 backtrace
.args
= &args
[1];
2976 backtrace
.nargs
= nargs
- 1;
2977 backtrace
.evalargs
= 0;
2978 backtrace
.debug_on_exit
= 0;
2980 if (debug_on_next_call
)
2981 do_debug_on_call (Qlambda
);
2985 original_fun
= args
[0];
2989 /* Optimize for no indirection. */
2991 if (SYMBOLP (fun
) && !EQ (fun
, Qunbound
)
2992 && (fun
= XSYMBOL (fun
)->function
, SYMBOLP (fun
)))
2993 fun
= indirect_function (fun
);
2997 if (numargs
< XSUBR (fun
)->min_args
2998 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
3000 XSETFASTINT (lisp_numargs
, numargs
);
3001 xsignal2 (Qwrong_number_of_arguments
, original_fun
, lisp_numargs
);
3004 if (XSUBR (fun
)->max_args
== UNEVALLED
)
3005 xsignal1 (Qinvalid_function
, original_fun
);
3007 if (XSUBR (fun
)->max_args
== MANY
)
3009 val
= (*XSUBR (fun
)->function
) (numargs
, args
+ 1);
3013 if (XSUBR (fun
)->max_args
> numargs
)
3015 internal_args
= (Lisp_Object
*) alloca (XSUBR (fun
)->max_args
* sizeof (Lisp_Object
));
3016 bcopy (args
+ 1, internal_args
, numargs
* sizeof (Lisp_Object
));
3017 for (i
= numargs
; i
< XSUBR (fun
)->max_args
; i
++)
3018 internal_args
[i
] = Qnil
;
3021 internal_args
= args
+ 1;
3022 switch (XSUBR (fun
)->max_args
)
3025 val
= (*XSUBR (fun
)->function
) ();
3028 val
= (*XSUBR (fun
)->function
) (internal_args
[0]);
3031 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1]);
3034 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
3038 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
3039 internal_args
[2], internal_args
[3]);
3042 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
3043 internal_args
[2], internal_args
[3],
3047 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
3048 internal_args
[2], internal_args
[3],
3049 internal_args
[4], internal_args
[5]);
3052 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
3053 internal_args
[2], internal_args
[3],
3054 internal_args
[4], internal_args
[5],
3059 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
3060 internal_args
[2], internal_args
[3],
3061 internal_args
[4], internal_args
[5],
3062 internal_args
[6], internal_args
[7]);
3067 /* If a subr takes more than 8 arguments without using MANY
3068 or UNEVALLED, we need to extend this function to support it.
3069 Until this is done, there is no way to call the function. */
3073 if (COMPILEDP (fun
))
3074 val
= funcall_lambda (fun
, numargs
, args
+ 1);
3077 if (EQ (fun
, Qunbound
))
3078 xsignal1 (Qvoid_function
, original_fun
);
3080 xsignal1 (Qinvalid_function
, original_fun
);
3081 funcar
= XCAR (fun
);
3082 if (!SYMBOLP (funcar
))
3083 xsignal1 (Qinvalid_function
, original_fun
);
3084 if (EQ (funcar
, Qlambda
))
3085 val
= funcall_lambda (fun
, numargs
, args
+ 1);
3086 else if (EQ (funcar
, Qautoload
))
3088 do_autoload (fun
, original_fun
);
3093 xsignal1 (Qinvalid_function
, original_fun
);
3098 if (backtrace
.debug_on_exit
)
3099 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
3100 backtrace_list
= backtrace
.next
;
3105 apply_lambda (fun
, args
, eval_flag
)
3106 Lisp_Object fun
, args
;
3109 Lisp_Object args_left
;
3110 Lisp_Object numargs
;
3111 register Lisp_Object
*arg_vector
;
3112 struct gcpro gcpro1
, gcpro2
, gcpro3
;
3114 register Lisp_Object tem
;
3116 numargs
= Flength (args
);
3117 arg_vector
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
3120 GCPRO3 (*arg_vector
, args_left
, fun
);
3123 for (i
= 0; i
< XINT (numargs
);)
3125 tem
= Fcar (args_left
), args_left
= Fcdr (args_left
);
3126 if (eval_flag
) tem
= Feval (tem
);
3127 arg_vector
[i
++] = tem
;
3135 backtrace_list
->args
= arg_vector
;
3136 backtrace_list
->nargs
= i
;
3138 backtrace_list
->evalargs
= 0;
3139 tem
= funcall_lambda (fun
, XINT (numargs
), arg_vector
);
3141 /* Do the debug-on-exit now, while arg_vector still exists. */
3142 if (backtrace_list
->debug_on_exit
)
3143 tem
= call_debugger (Fcons (Qexit
, Fcons (tem
, Qnil
)));
3144 /* Don't do it again when we return to eval. */
3145 backtrace_list
->debug_on_exit
= 0;
3149 /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
3150 and return the result of evaluation.
3151 FUN must be either a lambda-expression or a compiled-code object. */
3154 funcall_lambda (fun
, nargs
, arg_vector
)
3157 register Lisp_Object
*arg_vector
;
3159 Lisp_Object val
, syms_left
, next
;
3160 int count
= SPECPDL_INDEX ();
3161 int i
, optional
, rest
;
3165 syms_left
= XCDR (fun
);
3166 if (CONSP (syms_left
))
3167 syms_left
= XCAR (syms_left
);
3169 xsignal1 (Qinvalid_function
, fun
);
3171 else if (COMPILEDP (fun
))
3172 syms_left
= AREF (fun
, COMPILED_ARGLIST
);
3176 i
= optional
= rest
= 0;
3177 for (; CONSP (syms_left
); syms_left
= XCDR (syms_left
))
3181 next
= XCAR (syms_left
);
3182 if (!SYMBOLP (next
))
3183 xsignal1 (Qinvalid_function
, fun
);
3185 if (EQ (next
, Qand_rest
))
3187 else if (EQ (next
, Qand_optional
))
3191 specbind (next
, Flist (nargs
- i
, &arg_vector
[i
]));
3195 specbind (next
, arg_vector
[i
++]);
3197 xsignal2 (Qwrong_number_of_arguments
, fun
, make_number (nargs
));
3199 specbind (next
, Qnil
);
3202 if (!NILP (syms_left
))
3203 xsignal1 (Qinvalid_function
, fun
);
3205 xsignal2 (Qwrong_number_of_arguments
, fun
, make_number (nargs
));
3208 val
= Fprogn (XCDR (XCDR (fun
)));
3211 /* If we have not actually read the bytecode string
3212 and constants vector yet, fetch them from the file. */
3213 if (CONSP (AREF (fun
, COMPILED_BYTECODE
)))
3214 Ffetch_bytecode (fun
);
3215 val
= Fbyte_code (AREF (fun
, COMPILED_BYTECODE
),
3216 AREF (fun
, COMPILED_CONSTANTS
),
3217 AREF (fun
, COMPILED_STACK_DEPTH
));
3220 return unbind_to (count
, val
);
3223 DEFUN ("fetch-bytecode", Ffetch_bytecode
, Sfetch_bytecode
,
3225 doc
: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */)
3231 if (COMPILEDP (object
) && CONSP (AREF (object
, COMPILED_BYTECODE
)))
3233 tem
= read_doc_string (AREF (object
, COMPILED_BYTECODE
));
3236 tem
= AREF (object
, COMPILED_BYTECODE
);
3237 if (CONSP (tem
) && STRINGP (XCAR (tem
)))
3238 error ("Invalid byte code in %s", SDATA (XCAR (tem
)));
3240 error ("Invalid byte code");
3242 ASET (object
, COMPILED_BYTECODE
, XCAR (tem
));
3243 ASET (object
, COMPILED_CONSTANTS
, XCDR (tem
));
3251 register int count
= SPECPDL_INDEX ();
3252 if (specpdl_size
>= max_specpdl_size
)
3254 if (max_specpdl_size
< 400)
3255 max_specpdl_size
= 400;
3256 if (specpdl_size
>= max_specpdl_size
)
3257 signal_error ("Variable binding depth exceeds max-specpdl-size", Qnil
);
3260 if (specpdl_size
> max_specpdl_size
)
3261 specpdl_size
= max_specpdl_size
;
3262 specpdl
= (struct specbinding
*) xrealloc (specpdl
, specpdl_size
* sizeof (struct specbinding
));
3263 specpdl_ptr
= specpdl
+ count
;
3267 specbind (symbol
, value
)
3268 Lisp_Object symbol
, value
;
3270 struct Lisp_Symbol
*sym
;
3272 eassert (!handling_signal
);
3274 CHECK_SYMBOL (symbol
);
3275 sym
= XSYMBOL (symbol
);
3276 if (specpdl_ptr
== specpdl
+ specpdl_size
)
3280 switch (sym
->redirect
)
3282 case SYMBOL_VARALIAS
:
3283 sym
= indirect_variable (sym
); XSETSYMBOL (symbol
, sym
); goto start
;
3284 case SYMBOL_PLAINVAL
:
3285 { /* The most common case is that of a non-constant symbol with a
3286 trivial value. Make that as fast as we can. */
3287 specpdl_ptr
->symbol
= symbol
;
3288 specpdl_ptr
->old_value
= SYMBOL_VAL (sym
);
3289 specpdl_ptr
->func
= NULL
;
3292 SET_SYMBOL_VAL (sym
, value
);
3294 set_internal (symbol
, value
, 0, 1);
3297 case SYMBOL_LOCALIZED
: case SYMBOL_FORWARDED
:
3299 Lisp_Object ovalue
= find_symbol_value (symbol
);
3300 specpdl_ptr
->func
= 0;
3301 specpdl_ptr
->old_value
= ovalue
;
3303 eassert (sym
->redirect
!= SYMBOL_LOCALIZED
3304 || (EQ (SYMBOL_BLV (sym
)->where
,
3305 SYMBOL_BLV (sym
)->frame_local
?
3306 Fselected_frame () : Fcurrent_buffer ())));
3308 if (sym
->redirect
== SYMBOL_LOCALIZED
3309 || BUFFER_OBJFWDP (SYMBOL_FWD (sym
)))
3311 Lisp_Object where
, cur_buf
= Fcurrent_buffer ();
3313 /* For a local variable, record both the symbol and which
3314 buffer's or frame's value we are saving. */
3315 if (!NILP (Flocal_variable_p (symbol
, Qnil
)))
3317 eassert (sym
->redirect
!= SYMBOL_LOCALIZED
3318 || (BLV_FOUND (SYMBOL_BLV (sym
))
3319 && EQ (cur_buf
, SYMBOL_BLV (sym
)->where
)));
3322 else if (sym
->redirect
== SYMBOL_LOCALIZED
3323 && BLV_FOUND (SYMBOL_BLV (sym
)))
3324 where
= SYMBOL_BLV (sym
)->where
;
3328 /* We're not using the `unused' slot in the specbinding
3329 structure because this would mean we have to do more
3330 work for simple variables. */
3331 /* FIXME: The third value `current_buffer' is only used in
3332 let_shadows_buffer_binding_p which is itself only used
3333 in set_internal for local_if_set. */
3334 specpdl_ptr
->symbol
= Fcons (symbol
, Fcons (where
, cur_buf
));
3336 /* If SYMBOL is a per-buffer variable which doesn't have a
3337 buffer-local value here, make the `let' change the global
3338 value by changing the value of SYMBOL in all buffers not
3339 having their own value. This is consistent with what
3340 happens with other buffer-local variables. */
3342 && sym
->redirect
== SYMBOL_FORWARDED
)
3344 eassert (BUFFER_OBJFWDP (SYMBOL_FWD (sym
)));
3346 Fset_default (symbol
, value
);
3351 specpdl_ptr
->symbol
= symbol
;
3354 set_internal (symbol
, value
, 0, 1);
3362 record_unwind_protect (function
, arg
)
3363 Lisp_Object (*function
) P_ ((Lisp_Object
));
3366 eassert (!handling_signal
);
3368 if (specpdl_ptr
== specpdl
+ specpdl_size
)
3370 specpdl_ptr
->func
= function
;
3371 specpdl_ptr
->symbol
= Qnil
;
3372 specpdl_ptr
->old_value
= arg
;
3377 unbind_to (count
, value
)
3381 Lisp_Object quitf
= Vquit_flag
;
3382 struct gcpro gcpro1
, gcpro2
;
3384 GCPRO2 (value
, quitf
);
3387 while (specpdl_ptr
!= specpdl
+ count
)
3389 /* Copy the binding, and decrement specpdl_ptr, before we do
3390 the work to unbind it. We decrement first
3391 so that an error in unbinding won't try to unbind
3392 the same entry again, and we copy the binding first
3393 in case more bindings are made during some of the code we run. */
3395 struct specbinding this_binding
;
3396 this_binding
= *--specpdl_ptr
;
3398 if (this_binding
.func
!= 0)
3399 (*this_binding
.func
) (this_binding
.old_value
);
3400 /* If the symbol is a list, it is really (SYMBOL WHERE
3401 . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a
3402 frame. If WHERE is a buffer or frame, this indicates we
3403 bound a variable that had a buffer-local or frame-local
3404 binding. WHERE nil means that the variable had the default
3405 value when it was bound. CURRENT-BUFFER is the buffer that
3406 was current when the variable was bound. */
3407 else if (CONSP (this_binding
.symbol
))
3409 Lisp_Object symbol
, where
;
3411 symbol
= XCAR (this_binding
.symbol
);
3412 where
= XCAR (XCDR (this_binding
.symbol
));
3415 Fset_default (symbol
, this_binding
.old_value
);
3416 else if (BUFFERP (where
))
3417 if (!NILP (Flocal_variable_p (symbol
, where
)))
3418 set_internal (symbol
, this_binding
.old_value
, XBUFFER (where
), 1);
3419 /* else if (!NILP (Fbuffer_live_p (where)))
3420 error ("Unbinding local %s to global!", symbol); */
3424 set_internal (symbol
, this_binding
.old_value
, NULL
, 1);
3428 /* If variable has a trivial value (no forwarding), we can
3429 just set it. No need to check for constant symbols here,
3430 since that was already done by specbind. */
3431 if (XSYMBOL (this_binding
.symbol
)->redirect
== SYMBOL_PLAINVAL
)
3432 SET_SYMBOL_VAL (XSYMBOL (this_binding
.symbol
),
3433 this_binding
.old_value
);
3435 set_internal (this_binding
.symbol
, this_binding
.old_value
, 0, 1);
3439 if (NILP (Vquit_flag
) && !NILP (quitf
))
3446 DEFUN ("backtrace-debug", Fbacktrace_debug
, Sbacktrace_debug
, 2, 2, 0,
3447 doc
: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.
3448 The debugger is entered when that frame exits, if the flag is non-nil. */)
3450 Lisp_Object level
, flag
;
3452 register struct backtrace
*backlist
= backtrace_list
;
3455 CHECK_NUMBER (level
);
3457 for (i
= 0; backlist
&& i
< XINT (level
); i
++)
3459 backlist
= backlist
->next
;
3463 backlist
->debug_on_exit
= !NILP (flag
);
3468 DEFUN ("backtrace", Fbacktrace
, Sbacktrace
, 0, 0, "",
3469 doc
: /* Print a trace of Lisp function calls currently active.
3470 Output stream used is value of `standard-output'. */)
3473 register struct backtrace
*backlist
= backtrace_list
;
3477 extern Lisp_Object Vprint_level
;
3478 struct gcpro gcpro1
;
3480 XSETFASTINT (Vprint_level
, 3);
3487 write_string (backlist
->debug_on_exit
? "* " : " ", 2);
3488 if (backlist
->nargs
== UNEVALLED
)
3490 Fprin1 (Fcons (*backlist
->function
, *backlist
->args
), Qnil
);
3491 write_string ("\n", -1);
3495 tem
= *backlist
->function
;
3496 Fprin1 (tem
, Qnil
); /* This can QUIT */
3497 write_string ("(", -1);
3498 if (backlist
->nargs
== MANY
)
3500 for (tail
= *backlist
->args
, i
= 0;
3502 tail
= Fcdr (tail
), i
++)
3504 if (i
) write_string (" ", -1);
3505 Fprin1 (Fcar (tail
), Qnil
);
3510 for (i
= 0; i
< backlist
->nargs
; i
++)
3512 if (i
) write_string (" ", -1);
3513 Fprin1 (backlist
->args
[i
], Qnil
);
3516 write_string (")\n", -1);
3518 backlist
= backlist
->next
;
3521 Vprint_level
= Qnil
;
3526 DEFUN ("backtrace-frame", Fbacktrace_frame
, Sbacktrace_frame
, 1, 1, NULL
,
3527 doc
: /* Return the function and arguments NFRAMES up from current execution point.
3528 If that frame has not evaluated the arguments yet (or is a special form),
3529 the value is (nil FUNCTION ARG-FORMS...).
3530 If that frame has evaluated its arguments and called its function already,
3531 the value is (t FUNCTION ARG-VALUES...).
3532 A &rest arg is represented as the tail of the list ARG-VALUES.
3533 FUNCTION is whatever was supplied as car of evaluated list,
3534 or a lambda expression for macro calls.
3535 If NFRAMES is more than the number of frames, the value is nil. */)
3537 Lisp_Object nframes
;
3539 register struct backtrace
*backlist
= backtrace_list
;
3543 CHECK_NATNUM (nframes
);
3545 /* Find the frame requested. */
3546 for (i
= 0; backlist
&& i
< XFASTINT (nframes
); i
++)
3547 backlist
= backlist
->next
;
3551 if (backlist
->nargs
== UNEVALLED
)
3552 return Fcons (Qnil
, Fcons (*backlist
->function
, *backlist
->args
));
3555 if (backlist
->nargs
== MANY
)
3556 tem
= *backlist
->args
;
3558 tem
= Flist (backlist
->nargs
, backlist
->args
);
3560 return Fcons (Qt
, Fcons (*backlist
->function
, tem
));
3568 register struct backtrace
*backlist
;
3571 for (backlist
= backtrace_list
; backlist
; backlist
= backlist
->next
)
3573 mark_object (*backlist
->function
);
3575 if (backlist
->nargs
== UNEVALLED
|| backlist
->nargs
== MANY
)
3578 i
= backlist
->nargs
- 1;
3580 mark_object (backlist
->args
[i
]);
3587 DEFVAR_INT ("max-specpdl-size", &max_specpdl_size
,
3588 doc
: /* *Limit on number of Lisp variable bindings and `unwind-protect's.
3589 If Lisp code tries to increase the total number past this amount,
3590 an error is signaled.
3591 You can safely use a value considerably larger than the default value,
3592 if that proves inconveniently small. However, if you increase it too far,
3593 Emacs could run out of memory trying to make the stack bigger. */);
3595 DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth
,
3596 doc
: /* *Limit on depth in `eval', `apply' and `funcall' before error.
3598 This limit serves to catch infinite recursions for you before they cause
3599 actual stack overflow in C, which would be fatal for Emacs.
3600 You can safely make it considerably larger than its default value,
3601 if that proves inconveniently small. However, if you increase it too far,
3602 Emacs could overflow the real C stack, and crash. */);
3604 DEFVAR_LISP ("quit-flag", &Vquit_flag
,
3605 doc
: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.
3606 If the value is t, that means do an ordinary quit.
3607 If the value equals `throw-on-input', that means quit by throwing
3608 to the tag specified in `throw-on-input'; it's for handling `while-no-input'.
3609 Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit',
3610 but `inhibit-quit' non-nil prevents anything from taking notice of that. */);
3613 DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit
,
3614 doc
: /* Non-nil inhibits C-g quitting from happening immediately.
3615 Note that `quit-flag' will still be set by typing C-g,
3616 so a quit will be signaled as soon as `inhibit-quit' is nil.
3617 To prevent this happening, set `quit-flag' to nil
3618 before making `inhibit-quit' nil. */);
3619 Vinhibit_quit
= Qnil
;
3621 Qinhibit_quit
= intern_c_string ("inhibit-quit");
3622 staticpro (&Qinhibit_quit
);
3624 Qautoload
= intern_c_string ("autoload");
3625 staticpro (&Qautoload
);
3627 Qdebug_on_error
= intern_c_string ("debug-on-error");
3628 staticpro (&Qdebug_on_error
);
3630 Qmacro
= intern_c_string ("macro");
3631 staticpro (&Qmacro
);
3633 Qdeclare
= intern_c_string ("declare");
3634 staticpro (&Qdeclare
);
3636 /* Note that the process handling also uses Qexit, but we don't want
3637 to staticpro it twice, so we just do it here. */
3638 Qexit
= intern_c_string ("exit");
3641 Qinteractive
= intern_c_string ("interactive");
3642 staticpro (&Qinteractive
);
3644 Qcommandp
= intern_c_string ("commandp");
3645 staticpro (&Qcommandp
);
3647 Qdefun
= intern_c_string ("defun");
3648 staticpro (&Qdefun
);
3650 Qand_rest
= intern_c_string ("&rest");
3651 staticpro (&Qand_rest
);
3653 Qand_optional
= intern_c_string ("&optional");
3654 staticpro (&Qand_optional
);
3656 Qdebug
= intern_c_string ("debug");
3657 staticpro (&Qdebug
);
3659 DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error
,
3660 doc
: /* *Non-nil means errors display a backtrace buffer.
3661 More precisely, this happens for any error that is handled
3662 by the editor command loop.
3663 If the value is a list, an error only means to display a backtrace
3664 if one of its condition symbols appears in the list. */);
3665 Vstack_trace_on_error
= Qnil
;
3667 DEFVAR_LISP ("debug-on-error", &Vdebug_on_error
,
3668 doc
: /* *Non-nil means enter debugger if an error is signaled.
3669 Does not apply to errors handled by `condition-case' or those
3670 matched by `debug-ignored-errors'.
3671 If the value is a list, an error only means to enter the debugger
3672 if one of its condition symbols appears in the list.
3673 When you evaluate an expression interactively, this variable
3674 is temporarily non-nil if `eval-expression-debug-on-error' is non-nil.
3675 The command `toggle-debug-on-error' toggles this.
3676 See also the variable `debug-on-quit'. */);
3677 Vdebug_on_error
= Qnil
;
3679 DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors
,
3680 doc
: /* *List of errors for which the debugger should not be called.
3681 Each element may be a condition-name or a regexp that matches error messages.
3682 If any element applies to a given error, that error skips the debugger
3683 and just returns to top level.
3684 This overrides the variable `debug-on-error'.
3685 It does not apply to errors handled by `condition-case'. */);
3686 Vdebug_ignored_errors
= Qnil
;
3688 DEFVAR_BOOL ("debug-on-quit", &debug_on_quit
,
3689 doc
: /* *Non-nil means enter debugger if quit is signaled (C-g, for example).
3690 Does not apply if quit is handled by a `condition-case'. */);
3693 DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call
,
3694 doc
: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */);
3696 DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue
,
3697 doc
: /* Non-nil means debugger may continue execution.
3698 This is nil when the debugger is called under circumstances where it
3699 might not be safe to continue. */);
3700 debugger_may_continue
= 1;
3702 DEFVAR_LISP ("debugger", &Vdebugger
,
3703 doc
: /* Function to call to invoke debugger.
3704 If due to frame exit, args are `exit' and the value being returned;
3705 this function's value will be returned instead of that.
3706 If due to error, args are `error' and a list of the args to `signal'.
3707 If due to `apply' or `funcall' entry, one arg, `lambda'.
3708 If due to `eval' entry, one arg, t. */);
3711 DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function
,
3712 doc
: /* If non-nil, this is a function for `signal' to call.
3713 It receives the same arguments that `signal' was given.
3714 The Edebug package uses this to regain control. */);
3715 Vsignal_hook_function
= Qnil
;
3717 DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal
,
3718 doc
: /* *Non-nil means call the debugger regardless of condition handlers.
3719 Note that `debug-on-error', `debug-on-quit' and friends
3720 still determine whether to handle the particular condition. */);
3721 Vdebug_on_signal
= Qnil
;
3723 DEFVAR_LISP ("macro-declaration-function", &Vmacro_declaration_function
,
3724 doc
: /* Function to process declarations in a macro definition.
3725 The function will be called with two args MACRO and DECL.
3726 MACRO is the name of the macro being defined.
3727 DECL is a list `(declare ...)' containing the declarations.
3728 The value the function returns is not used. */);
3729 Vmacro_declaration_function
= Qnil
;
3731 Vrun_hooks
= intern_c_string ("run-hooks");
3732 staticpro (&Vrun_hooks
);
3734 staticpro (&Vautoload_queue
);
3735 Vautoload_queue
= Qnil
;
3736 staticpro (&Vsignaling_function
);
3737 Vsignaling_function
= Qnil
;
3748 defsubr (&Sfunction
);
3750 defsubr (&Sdefmacro
);
3752 defsubr (&Sdefvaralias
);
3753 defsubr (&Sdefconst
);
3754 defsubr (&Suser_variable_p
);
3758 defsubr (&Smacroexpand
);
3761 defsubr (&Sunwind_protect
);
3762 defsubr (&Scondition_case
);
3764 defsubr (&Sinteractive_p
);
3765 defsubr (&Scalled_interactively_p
);
3766 defsubr (&Scommandp
);
3767 defsubr (&Sautoload
);
3770 defsubr (&Sfuncall
);
3771 defsubr (&Srun_hooks
);
3772 defsubr (&Srun_hook_with_args
);
3773 defsubr (&Srun_hook_with_args_until_success
);
3774 defsubr (&Srun_hook_with_args_until_failure
);
3775 defsubr (&Sfetch_bytecode
);
3776 defsubr (&Sbacktrace_debug
);
3777 defsubr (&Sbacktrace
);
3778 defsubr (&Sbacktrace_frame
);
3781 /* arch-tag: 014a07aa-33ab-4a8f-a3d2-ee8a4a9ff7fb
3782 (do not change this comment) */