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 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
25 #include "blockinput.h"
28 #include "dispextern.h"
31 /* This definition is duplicated in alloc.c and keyboard.c */
32 /* Putting it in lisp.h makes cc bomb out! */
36 struct backtrace
*next
;
37 Lisp_Object
*function
;
38 Lisp_Object
*args
; /* Points to vector of args. */
39 int nargs
; /* Length of vector.
40 If nargs is UNEVALLED, args points to slot holding
41 list of unevalled args */
43 /* Nonzero means call value of debugger when done with this operation. */
47 struct backtrace
*backtrace_list
;
49 /* This structure helps implement the `catch' and `throw' control
50 structure. A struct catchtag contains all the information needed
51 to restore the state of the interpreter after a non-local jump.
53 Handlers for error conditions (represented by `struct handler'
54 structures) just point to a catch tag to do the cleanup required
57 catchtag structures are chained together in the C calling stack;
58 the `next' member points to the next outer catchtag.
60 A call like (throw TAG VAL) searches for a catchtag whose `tag'
61 member is TAG, and then unbinds to it. The `val' member is used to
62 hold VAL while the stack is unwound; `val' is returned as the value
65 All the other members are concerned with restoring the interpreter
72 struct catchtag
*next
;
75 struct backtrace
*backlist
;
76 struct handler
*handlerlist
;
79 int poll_suppress_count
;
80 int interrupt_input_blocked
;
81 struct byte_stack
*byte_stack
;
84 struct catchtag
*catchlist
;
87 /* Count levels of GCPRO to detect failure to UNGCPRO. */
91 Lisp_Object Qautoload
, Qmacro
, Qexit
, Qinteractive
, Qcommandp
, Qdefun
;
92 Lisp_Object Qinhibit_quit
, Vinhibit_quit
, Vquit_flag
;
93 Lisp_Object Qand_rest
, Qand_optional
;
94 Lisp_Object Qdebug_on_error
;
97 /* This holds either the symbol `run-hooks' or nil.
98 It is nil at an early stage of startup, and when Emacs
101 Lisp_Object Vrun_hooks
;
103 /* Non-nil means record all fset's and provide's, to be undone
104 if the file being autoloaded is not fully loaded.
105 They are recorded by being consed onto the front of Vautoload_queue:
106 (FUN . ODEF) for a defun, (0 . OFEATURES) for a provide. */
108 Lisp_Object Vautoload_queue
;
110 /* Current number of specbindings allocated in specpdl. */
114 /* Pointer to beginning of specpdl. */
116 struct specbinding
*specpdl
;
118 /* Pointer to first unused element in specpdl. */
120 struct specbinding
*specpdl_ptr
;
122 /* Maximum size allowed for specpdl allocation */
124 EMACS_INT max_specpdl_size
;
126 /* Depth in Lisp evaluations and function calls. */
130 /* Maximum allowed depth in Lisp evaluations and function calls. */
132 EMACS_INT max_lisp_eval_depth
;
134 /* Nonzero means enter debugger before next function call */
136 int debug_on_next_call
;
138 /* Non-zero means debugger may continue. This is zero when the
139 debugger is called during redisplay, where it might not be safe to
140 continue the interrupted redisplay. */
142 int debugger_may_continue
;
144 /* List of conditions (non-nil atom means all) which cause a backtrace
145 if an error is handled by the command loop's error handler. */
147 Lisp_Object Vstack_trace_on_error
;
149 /* List of conditions (non-nil atom means all) which enter the debugger
150 if an error is handled by the command loop's error handler. */
152 Lisp_Object Vdebug_on_error
;
154 /* List of conditions and regexps specifying error messages which
155 do not enter the debugger even if Vdebug_on_error says they should. */
157 Lisp_Object Vdebug_ignored_errors
;
159 /* Non-nil means call the debugger even if the error will be handled. */
161 Lisp_Object Vdebug_on_signal
;
163 /* Hook for edebug to use. */
165 Lisp_Object Vsignal_hook_function
;
167 /* Nonzero means enter debugger if a quit signal
168 is handled by the command loop's error handler. */
172 /* The value of num_nonmacro_input_events as of the last time we
173 started to enter the debugger. If we decide to enter the debugger
174 again when this is still equal to num_nonmacro_input_events, then we
175 know that the debugger itself has an error, and we should just
176 signal the error instead of entering an infinite loop of debugger
179 int when_entered_debugger
;
181 Lisp_Object Vdebugger
;
183 /* The function from which the last `signal' was called. Set in
186 Lisp_Object Vsignaling_function
;
188 /* Set to non-zero while processing X events. Checked in Feval to
189 make sure the Lisp interpreter isn't called from a signal handler,
190 which is unsafe because the interpreter isn't reentrant. */
194 /* Function to process declarations in defmacro forms. */
196 Lisp_Object Vmacro_declaration_function
;
198 extern Lisp_Object Qrisky_local_variable
;
200 static Lisp_Object funcall_lambda
P_ ((Lisp_Object
, int, Lisp_Object
*));
206 specpdl
= (struct specbinding
*) xmalloc (specpdl_size
* sizeof (struct specbinding
));
207 specpdl_ptr
= specpdl
;
208 /* Don't forget to update docs (lispref node "Local Variables"). */
209 max_specpdl_size
= 1000;
210 max_lisp_eval_depth
= 300;
218 specpdl_ptr
= specpdl
;
223 debug_on_next_call
= 0;
228 /* This is less than the initial value of num_nonmacro_input_events. */
229 when_entered_debugger
= -1;
232 /* unwind-protect function used by call_debugger. */
235 restore_stack_limits (data
)
238 max_specpdl_size
= XINT (XCAR (data
));
239 max_lisp_eval_depth
= XINT (XCDR (data
));
243 /* Call the Lisp debugger, giving it argument ARG. */
249 int debug_while_redisplaying
;
250 int count
= SPECPDL_INDEX ();
252 int old_max
= max_specpdl_size
;
254 /* Temporarily bump up the stack limits,
255 so the debugger won't run out of stack. */
257 max_specpdl_size
+= 1;
258 record_unwind_protect (restore_stack_limits
,
259 Fcons (make_number (old_max
),
260 make_number (max_lisp_eval_depth
)));
261 max_specpdl_size
= old_max
;
263 if (lisp_eval_depth
+ 40 > max_lisp_eval_depth
)
264 max_lisp_eval_depth
= lisp_eval_depth
+ 40;
266 if (SPECPDL_INDEX () + 100 > max_specpdl_size
)
267 max_specpdl_size
= SPECPDL_INDEX () + 100;
269 #ifdef HAVE_X_WINDOWS
270 if (display_hourglass_p
)
274 debug_on_next_call
= 0;
275 when_entered_debugger
= num_nonmacro_input_events
;
277 /* Resetting redisplaying_p to 0 makes sure that debug output is
278 displayed if the debugger is invoked during redisplay. */
279 debug_while_redisplaying
= redisplaying_p
;
281 specbind (intern ("debugger-may-continue"),
282 debug_while_redisplaying
? Qnil
: Qt
);
283 specbind (Qinhibit_redisplay
, Qnil
);
284 specbind (Qdebug_on_error
, Qnil
);
286 #if 0 /* Binding this prevents execution of Lisp code during
287 redisplay, which necessarily leads to display problems. */
288 specbind (Qinhibit_eval_during_redisplay
, Qt
);
291 val
= apply1 (Vdebugger
, arg
);
293 /* Interrupting redisplay and resuming it later is not safe under
294 all circumstances. So, when the debugger returns, abort the
295 interrupted redisplay by going back to the top-level. */
296 if (debug_while_redisplaying
)
299 return unbind_to (count
, val
);
303 do_debug_on_call (code
)
306 debug_on_next_call
= 0;
307 backtrace_list
->debug_on_exit
= 1;
308 call_debugger (Fcons (code
, Qnil
));
311 /* NOTE!!! Every function that can call EVAL must protect its args
312 and temporaries from garbage collection while it needs them.
313 The definition of `For' shows what you have to do. */
315 DEFUN ("or", For
, Sor
, 0, UNEVALLED
, 0,
316 doc
: /* Eval args until one of them yields non-nil, then return that value.
317 The remaining args are not evalled at all.
318 If all args return nil, return nil.
319 usage: (or CONDITIONS ...) */)
323 register Lisp_Object val
= Qnil
;
330 val
= Feval (XCAR (args
));
340 DEFUN ("and", Fand
, Sand
, 0, UNEVALLED
, 0,
341 doc
: /* Eval args until one of them yields nil, then return nil.
342 The remaining args are not evalled at all.
343 If no arg yields nil, return the last arg's value.
344 usage: (and CONDITIONS ...) */)
348 register Lisp_Object val
= Qt
;
355 val
= Feval (XCAR (args
));
365 DEFUN ("if", Fif
, Sif
, 2, UNEVALLED
, 0,
366 doc
: /* If COND yields non-nil, do THEN, else do ELSE...
367 Returns the value of THEN or the value of the last of the ELSE's.
368 THEN must be one expression, but ELSE... can be zero or more expressions.
369 If COND yields nil, and there are no ELSE's, the value is nil.
370 usage: (if COND THEN ELSE...) */)
374 register Lisp_Object cond
;
378 cond
= Feval (Fcar (args
));
382 return Feval (Fcar (Fcdr (args
)));
383 return Fprogn (Fcdr (Fcdr (args
)));
386 DEFUN ("cond", Fcond
, Scond
, 0, UNEVALLED
, 0,
387 doc
: /* Try each clause until one succeeds.
388 Each clause looks like (CONDITION BODY...). CONDITION is evaluated
389 and, if the value is non-nil, this clause succeeds:
390 then the expressions in BODY are evaluated and the last one's
391 value is the value of the cond-form.
392 If no clause succeeds, cond returns nil.
393 If a clause has one element, as in (CONDITION),
394 CONDITION's value if non-nil is returned from the cond-form.
395 usage: (cond CLAUSES...) */)
399 register Lisp_Object clause
, val
;
406 clause
= Fcar (args
);
407 val
= Feval (Fcar (clause
));
410 if (!EQ (XCDR (clause
), Qnil
))
411 val
= Fprogn (XCDR (clause
));
421 DEFUN ("progn", Fprogn
, Sprogn
, 0, UNEVALLED
, 0,
422 doc
: /* Eval BODY forms sequentially and return value of last one.
423 usage: (progn BODY ...) */)
427 register Lisp_Object val
= Qnil
;
434 val
= Feval (XCAR (args
));
442 DEFUN ("prog1", Fprog1
, Sprog1
, 1, UNEVALLED
, 0,
443 doc
: /* Eval FIRST and BODY sequentially; value from FIRST.
444 The value of FIRST is saved during the evaluation of the remaining args,
445 whose values are discarded.
446 usage: (prog1 FIRST BODY...) */)
451 register Lisp_Object args_left
;
452 struct gcpro gcpro1
, gcpro2
;
453 register int argnum
= 0;
465 val
= Feval (Fcar (args_left
));
467 Feval (Fcar (args_left
));
468 args_left
= Fcdr (args_left
);
470 while (!NILP(args_left
));
476 DEFUN ("prog2", Fprog2
, Sprog2
, 2, UNEVALLED
, 0,
477 doc
: /* Eval FORM1, FORM2 and BODY sequentially; value from FORM2.
478 The value of FORM2 is saved during the evaluation of the
479 remaining args, whose values are discarded.
480 usage: (prog2 FORM1 FORM2 BODY...) */)
485 register Lisp_Object args_left
;
486 struct gcpro gcpro1
, gcpro2
;
487 register int argnum
= -1;
501 val
= Feval (Fcar (args_left
));
503 Feval (Fcar (args_left
));
504 args_left
= Fcdr (args_left
);
506 while (!NILP (args_left
));
512 DEFUN ("setq", Fsetq
, Ssetq
, 0, UNEVALLED
, 0,
513 doc
: /* Set each SYM to the value of its VAL.
514 The symbols SYM are variables; they are literal (not evaluated).
515 The values VAL are expressions; they are evaluated.
516 Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.
517 The second VAL is not computed until after the first SYM is set, and so on;
518 each VAL can use the new value of variables set earlier in the `setq'.
519 The return value of the `setq' form is the value of the last VAL.
520 usage: (setq SYM VAL SYM VAL ...) */)
524 register Lisp_Object args_left
;
525 register Lisp_Object val
, sym
;
536 val
= Feval (Fcar (Fcdr (args_left
)));
537 sym
= Fcar (args_left
);
539 args_left
= Fcdr (Fcdr (args_left
));
541 while (!NILP(args_left
));
547 DEFUN ("quote", Fquote
, Squote
, 1, UNEVALLED
, 0,
548 doc
: /* Return the argument, without evaluating it. `(quote x)' yields `x'.
549 usage: (quote ARG) */)
556 DEFUN ("function", Ffunction
, Sfunction
, 1, UNEVALLED
, 0,
557 doc
: /* Like `quote', but preferred for objects which are functions.
558 In byte compilation, `function' causes its argument to be compiled.
559 `quote' cannot do that.
560 usage: (function ARG) */)
568 DEFUN ("interactive-p", Finteractive_p
, Sinteractive_p
, 0, 0, 0,
569 doc
: /* Return t if the function was run directly by user input.
570 This means that the function was called with `call-interactively'
571 \(which includes being called as the binding of a key)
572 and input is currently coming from the keyboard (not in keyboard macro),
573 and Emacs is not running in batch mode (`noninteractive' is nil).
575 The only known proper use of `interactive-p' is in deciding whether to
576 display a helpful message, or how to display it. If you're thinking
577 of using it for any other purpose, it is quite likely that you're
578 making a mistake. Think: what do you want to do when the command is
579 called from a keyboard macro?
581 If you want to test whether your function was called with
582 `call-interactively', the way to do that is by adding an extra
583 optional argument, and making the `interactive' spec specify non-nil
584 unconditionally for that argument. (`p' is a good way to do this.) */)
587 return (INTERACTIVE
&& interactive_p (1)) ? Qt
: Qnil
;
591 DEFUN ("called-interactively-p", Fcalled_interactively_p
, Scalled_interactively_p
, 0, 0, 0,
592 doc
: /* Return t if the function using this was called with `call-interactively'.
593 This is used for implementing advice and other function-modifying
596 The cleanest way to test whether your function was called with
597 `call-interactively' is by adding an extra optional argument,
598 and making the `interactive' spec specify non-nil unconditionally
599 for that argument. (`p' is a good way to do this.) */)
602 return interactive_p (1) ? Qt
: Qnil
;
606 /* Return 1 if function in which this appears was called using
609 EXCLUDE_SUBRS_P non-zero means always return 0 if the function
610 called is a built-in. */
613 interactive_p (exclude_subrs_p
)
616 struct backtrace
*btp
;
619 btp
= backtrace_list
;
621 /* If this isn't a byte-compiled function, there may be a frame at
622 the top for Finteractive_p. If so, skip it. */
623 fun
= Findirect_function (*btp
->function
, Qnil
);
624 if (SUBRP (fun
) && (XSUBR (fun
) == &Sinteractive_p
625 || XSUBR (fun
) == &Scalled_interactively_p
))
628 /* If we're running an Emacs 18-style byte-compiled function, there
629 may be a frame for Fbytecode at the top level. In any version of
630 Emacs there can be Fbytecode frames for subexpressions evaluated
631 inside catch and condition-case. Skip past them.
633 If this isn't a byte-compiled function, then we may now be
634 looking at several frames for special forms. Skip past them. */
636 && (EQ (*btp
->function
, Qbytecode
)
637 || btp
->nargs
== UNEVALLED
))
640 /* btp now points at the frame of the innermost function that isn't
641 a special form, ignoring frames for Finteractive_p and/or
642 Fbytecode at the top. If this frame is for a built-in function
643 (such as load or eval-region) return nil. */
644 fun
= Findirect_function (*btp
->function
, Qnil
);
645 if (exclude_subrs_p
&& SUBRP (fun
))
648 /* btp points to the frame of a Lisp function that called interactive-p.
649 Return t if that function was called interactively. */
650 if (btp
&& btp
->next
&& EQ (*btp
->next
->function
, Qcall_interactively
))
656 DEFUN ("defun", Fdefun
, Sdefun
, 2, UNEVALLED
, 0,
657 doc
: /* Define NAME as a function.
658 The definition is (lambda ARGLIST [DOCSTRING] BODY...).
659 See also the function `interactive'.
660 usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */)
664 register Lisp_Object fn_name
;
665 register Lisp_Object defn
;
667 fn_name
= Fcar (args
);
668 CHECK_SYMBOL (fn_name
);
669 defn
= Fcons (Qlambda
, Fcdr (args
));
670 if (!NILP (Vpurify_flag
))
671 defn
= Fpurecopy (defn
);
672 if (CONSP (XSYMBOL (fn_name
)->function
)
673 && EQ (XCAR (XSYMBOL (fn_name
)->function
), Qautoload
))
674 LOADHIST_ATTACH (Fcons (Qt
, fn_name
));
675 Ffset (fn_name
, defn
);
676 LOADHIST_ATTACH (Fcons (Qdefun
, fn_name
));
680 DEFUN ("defmacro", Fdefmacro
, Sdefmacro
, 2, UNEVALLED
, 0,
681 doc
: /* Define NAME as a macro.
682 The actual definition looks like
683 (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...).
684 When the macro is called, as in (NAME ARGS...),
685 the function (lambda ARGLIST BODY...) is applied to
686 the list ARGS... as it appears in the expression,
687 and the result should be a form to be evaluated instead of the original.
689 DECL is a declaration, optional, which can specify how to indent
690 calls to this macro and how Edebug should handle it. It looks like this:
692 The elements can look like this:
694 Set NAME's `lisp-indent-function' property to INDENT.
697 Set NAME's `edebug-form-spec' property to DEBUG. (This is
698 equivalent to writing a `def-edebug-spec' for the macro.)
699 usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */)
703 register Lisp_Object fn_name
;
704 register Lisp_Object defn
;
705 Lisp_Object lambda_list
, doc
, tail
;
707 fn_name
= Fcar (args
);
708 CHECK_SYMBOL (fn_name
);
709 lambda_list
= Fcar (Fcdr (args
));
710 tail
= Fcdr (Fcdr (args
));
713 if (STRINGP (Fcar (tail
)))
719 while (CONSP (Fcar (tail
))
720 && EQ (Fcar (Fcar (tail
)), Qdeclare
))
722 if (!NILP (Vmacro_declaration_function
))
726 call2 (Vmacro_declaration_function
, fn_name
, Fcar (tail
));
734 tail
= Fcons (lambda_list
, tail
);
736 tail
= Fcons (lambda_list
, Fcons (doc
, tail
));
737 defn
= Fcons (Qmacro
, Fcons (Qlambda
, tail
));
739 if (!NILP (Vpurify_flag
))
740 defn
= Fpurecopy (defn
);
741 if (CONSP (XSYMBOL (fn_name
)->function
)
742 && EQ (XCAR (XSYMBOL (fn_name
)->function
), Qautoload
))
743 LOADHIST_ATTACH (Fcons (Qt
, fn_name
));
744 Ffset (fn_name
, defn
);
745 LOADHIST_ATTACH (Fcons (Qdefun
, fn_name
));
750 DEFUN ("defvaralias", Fdefvaralias
, Sdefvaralias
, 2, 3, 0,
751 doc
: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE.
752 Setting the value of NEW-ALIAS will subsequently set the value of BASE-VARIABLE,
753 and getting the value of NEW-ALIAS will return the value BASE-VARIABLE has.
754 Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is
755 omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE,
756 or of the variable at the end of the chain of aliases, if BASE-VARIABLE is
758 The return value is BASE-VARIABLE. */)
759 (new_alias
, base_variable
, docstring
)
760 Lisp_Object new_alias
, base_variable
, docstring
;
762 struct Lisp_Symbol
*sym
;
764 CHECK_SYMBOL (new_alias
);
765 CHECK_SYMBOL (base_variable
);
767 if (SYMBOL_CONSTANT_P (new_alias
))
768 error ("Cannot make a constant an alias");
770 sym
= XSYMBOL (new_alias
);
771 sym
->indirect_variable
= 1;
772 sym
->value
= base_variable
;
773 sym
->constant
= SYMBOL_CONSTANT_P (base_variable
);
774 LOADHIST_ATTACH (new_alias
);
775 if (!NILP (docstring
))
776 Fput (new_alias
, Qvariable_documentation
, docstring
);
778 Fput (new_alias
, Qvariable_documentation
, Qnil
);
780 return base_variable
;
784 DEFUN ("defvar", Fdefvar
, Sdefvar
, 1, UNEVALLED
, 0,
785 doc
: /* Define SYMBOL as a variable, and return SYMBOL.
786 You are not required to define a variable in order to use it,
787 but the definition can supply documentation and an initial value
788 in a way that tags can recognize.
790 INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.
791 If SYMBOL is buffer-local, its default value is what is set;
792 buffer-local values are not affected.
793 INITVALUE and DOCSTRING are optional.
794 If DOCSTRING starts with *, this variable is identified as a user option.
795 This means that M-x set-variable recognizes it.
796 See also `user-variable-p'.
797 If INITVALUE is missing, SYMBOL's value is not set.
799 If SYMBOL has a local binding, then this form affects the local
800 binding. This is usually not what you want. Thus, if you need to
801 load a file defining variables, with this form or with `defconst' or
802 `defcustom', you should always load that file _outside_ any bindings
803 for these variables. \(`defconst' and `defcustom' behave similarly in
805 usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */)
809 register Lisp_Object sym
, tem
, tail
;
813 if (!NILP (Fcdr (Fcdr (tail
))))
814 error ("Too many arguments");
816 tem
= Fdefault_boundp (sym
);
819 if (SYMBOL_CONSTANT_P (sym
))
821 /* For upward compatibility, allow (defvar :foo (quote :foo)). */
822 Lisp_Object tem
= Fcar (tail
);
824 && EQ (XCAR (tem
), Qquote
)
825 && CONSP (XCDR (tem
))
826 && EQ (XCAR (XCDR (tem
)), sym
)))
827 error ("Constant symbol `%s' specified in defvar",
828 SDATA (SYMBOL_NAME (sym
)));
832 Fset_default (sym
, Feval (Fcar (tail
)));
834 { /* Check if there is really a global binding rather than just a let
835 binding that shadows the global unboundness of the var. */
836 volatile struct specbinding
*pdl
= specpdl_ptr
;
837 while (--pdl
>= specpdl
)
839 if (EQ (pdl
->symbol
, sym
) && !pdl
->func
840 && EQ (pdl
->old_value
, Qunbound
))
842 message_with_string ("Warning: defvar ignored because %s is let-bound",
843 SYMBOL_NAME (sym
), 1);
852 if (!NILP (Vpurify_flag
))
853 tem
= Fpurecopy (tem
);
854 Fput (sym
, Qvariable_documentation
, tem
);
856 LOADHIST_ATTACH (sym
);
859 /* Simple (defvar <var>) should not count as a definition at all.
860 It could get in the way of other definitions, and unloading this
861 package could try to make the variable unbound. */
867 DEFUN ("defconst", Fdefconst
, Sdefconst
, 2, UNEVALLED
, 0,
868 doc
: /* Define SYMBOL as a constant variable.
869 The intent is that neither programs nor users should ever change this value.
870 Always sets the value of SYMBOL to the result of evalling INITVALUE.
871 If SYMBOL is buffer-local, its default value is what is set;
872 buffer-local values are not affected.
873 DOCSTRING is optional.
875 If SYMBOL has a local binding, then this form sets the local binding's
876 value. However, you should normally not make local bindings for
877 variables defined with this form.
878 usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */)
882 register Lisp_Object sym
, tem
;
885 if (!NILP (Fcdr (Fcdr (Fcdr (args
)))))
886 error ("Too many arguments");
888 tem
= Feval (Fcar (Fcdr (args
)));
889 if (!NILP (Vpurify_flag
))
890 tem
= Fpurecopy (tem
);
891 Fset_default (sym
, tem
);
892 tem
= Fcar (Fcdr (Fcdr (args
)));
895 if (!NILP (Vpurify_flag
))
896 tem
= Fpurecopy (tem
);
897 Fput (sym
, Qvariable_documentation
, tem
);
899 Fput (sym
, Qrisky_local_variable
, Qt
);
900 LOADHIST_ATTACH (sym
);
904 /* Error handler used in Fuser_variable_p. */
906 user_variable_p_eh (ignore
)
912 DEFUN ("user-variable-p", Fuser_variable_p
, Suser_variable_p
, 1, 1, 0,
913 doc
: /* Return t if VARIABLE is intended to be set and modified by users.
914 \(The alternative is a variable used internally in a Lisp program.)
915 A variable is a user variable if
916 \(1) the first character of its documentation is `*', or
917 \(2) it is customizable (its property list contains a non-nil value
918 of `standard-value' or `custom-autoload'), or
919 \(3) it is an alias for another user variable.
920 Return nil if VARIABLE is an alias and there is a loop in the
921 chain of symbols. */)
923 Lisp_Object variable
;
925 Lisp_Object documentation
;
927 if (!SYMBOLP (variable
))
930 /* If indirect and there's an alias loop, don't check anything else. */
931 if (XSYMBOL (variable
)->indirect_variable
932 && NILP (internal_condition_case_1 (indirect_variable
, variable
,
933 Qt
, user_variable_p_eh
)))
938 documentation
= Fget (variable
, Qvariable_documentation
);
939 if (INTEGERP (documentation
) && XINT (documentation
) < 0)
941 if (STRINGP (documentation
)
942 && ((unsigned char) SREF (documentation
, 0) == '*'))
944 /* If it is (STRING . INTEGER), a negative integer means a user variable. */
945 if (CONSP (documentation
)
946 && STRINGP (XCAR (documentation
))
947 && INTEGERP (XCDR (documentation
))
948 && XINT (XCDR (documentation
)) < 0)
950 /* Customizable? See `custom-variable-p'. */
951 if ((!NILP (Fget (variable
, intern ("standard-value"))))
952 || (!NILP (Fget (variable
, intern ("custom-autoload")))))
955 if (!XSYMBOL (variable
)->indirect_variable
)
958 /* An indirect variable? Let's follow the chain. */
959 variable
= XSYMBOL (variable
)->value
;
963 DEFUN ("let*", FletX
, SletX
, 1, UNEVALLED
, 0,
964 doc
: /* Bind variables according to VARLIST then eval BODY.
965 The value of the last form in BODY is returned.
966 Each element of VARLIST is a symbol (which is bound to nil)
967 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
968 Each VALUEFORM can refer to the symbols already bound by this VARLIST.
969 usage: (let* VARLIST BODY...) */)
973 Lisp_Object varlist
, val
, elt
;
974 int count
= SPECPDL_INDEX ();
975 struct gcpro gcpro1
, gcpro2
, gcpro3
;
977 GCPRO3 (args
, elt
, varlist
);
979 varlist
= Fcar (args
);
980 while (!NILP (varlist
))
983 elt
= Fcar (varlist
);
985 specbind (elt
, Qnil
);
986 else if (! NILP (Fcdr (Fcdr (elt
))))
988 Fcons (build_string ("`let' bindings can have only one value-form"),
992 val
= Feval (Fcar (Fcdr (elt
)));
993 specbind (Fcar (elt
), val
);
995 varlist
= Fcdr (varlist
);
998 val
= Fprogn (Fcdr (args
));
999 return unbind_to (count
, val
);
1002 DEFUN ("let", Flet
, Slet
, 1, UNEVALLED
, 0,
1003 doc
: /* Bind variables according to VARLIST then eval BODY.
1004 The value of the last form in BODY is returned.
1005 Each element of VARLIST is a symbol (which is bound to nil)
1006 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
1007 All the VALUEFORMs are evalled before any symbols are bound.
1008 usage: (let VARLIST BODY...) */)
1012 Lisp_Object
*temps
, tem
;
1013 register Lisp_Object elt
, varlist
;
1014 int count
= SPECPDL_INDEX ();
1015 register int argnum
;
1016 struct gcpro gcpro1
, gcpro2
;
1018 varlist
= Fcar (args
);
1020 /* Make space to hold the values to give the bound variables */
1021 elt
= Flength (varlist
);
1022 temps
= (Lisp_Object
*) alloca (XFASTINT (elt
) * sizeof (Lisp_Object
));
1024 /* Compute the values and store them in `temps' */
1026 GCPRO2 (args
, *temps
);
1029 for (argnum
= 0; !NILP (varlist
); varlist
= Fcdr (varlist
))
1032 elt
= Fcar (varlist
);
1034 temps
[argnum
++] = Qnil
;
1035 else if (! NILP (Fcdr (Fcdr (elt
))))
1037 Fcons (build_string ("`let' bindings can have only one value-form"),
1040 temps
[argnum
++] = Feval (Fcar (Fcdr (elt
)));
1041 gcpro2
.nvars
= argnum
;
1045 varlist
= Fcar (args
);
1046 for (argnum
= 0; !NILP (varlist
); varlist
= Fcdr (varlist
))
1048 elt
= Fcar (varlist
);
1049 tem
= temps
[argnum
++];
1051 specbind (elt
, tem
);
1053 specbind (Fcar (elt
), tem
);
1056 elt
= Fprogn (Fcdr (args
));
1057 return unbind_to (count
, elt
);
1060 DEFUN ("while", Fwhile
, Swhile
, 1, UNEVALLED
, 0,
1061 doc
: /* If TEST yields non-nil, eval BODY... and repeat.
1062 The order of execution is thus TEST, BODY, TEST, BODY and so on
1063 until TEST returns nil.
1064 usage: (while TEST BODY...) */)
1068 Lisp_Object test
, body
;
1069 struct gcpro gcpro1
, gcpro2
;
1071 GCPRO2 (test
, body
);
1075 while (!NILP (Feval (test
)))
1085 DEFUN ("macroexpand", Fmacroexpand
, Smacroexpand
, 1, 2, 0,
1086 doc
: /* Return result of expanding macros at top level of FORM.
1087 If FORM is not a macro call, it is returned unchanged.
1088 Otherwise, the macro is expanded and the expansion is considered
1089 in place of FORM. When a non-macro-call results, it is returned.
1091 The second optional arg ENVIRONMENT specifies an environment of macro
1092 definitions to shadow the loaded ones for use in file byte-compilation. */)
1095 Lisp_Object environment
;
1097 /* With cleanups from Hallvard Furuseth. */
1098 register Lisp_Object expander
, sym
, def
, tem
;
1102 /* Come back here each time we expand a macro call,
1103 in case it expands into another macro call. */
1106 /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */
1107 def
= sym
= XCAR (form
);
1109 /* Trace symbols aliases to other symbols
1110 until we get a symbol that is not an alias. */
1111 while (SYMBOLP (def
))
1115 tem
= Fassq (sym
, environment
);
1118 def
= XSYMBOL (sym
)->function
;
1119 if (!EQ (def
, Qunbound
))
1124 /* Right now TEM is the result from SYM in ENVIRONMENT,
1125 and if TEM is nil then DEF is SYM's function definition. */
1128 /* SYM is not mentioned in ENVIRONMENT.
1129 Look at its function definition. */
1130 if (EQ (def
, Qunbound
) || !CONSP (def
))
1131 /* Not defined or definition not suitable */
1133 if (EQ (XCAR (def
), Qautoload
))
1135 /* Autoloading function: will it be a macro when loaded? */
1136 tem
= Fnth (make_number (4), def
);
1137 if (EQ (tem
, Qt
) || EQ (tem
, Qmacro
))
1138 /* Yes, load it and try again. */
1140 struct gcpro gcpro1
;
1142 do_autoload (def
, sym
);
1149 else if (!EQ (XCAR (def
), Qmacro
))
1151 else expander
= XCDR (def
);
1155 expander
= XCDR (tem
);
1156 if (NILP (expander
))
1159 form
= apply1 (expander
, XCDR (form
));
1164 DEFUN ("catch", Fcatch
, Scatch
, 1, UNEVALLED
, 0,
1165 doc
: /* Eval BODY allowing nonlocal exits using `throw'.
1166 TAG is evalled to get the tag to use; it must not be nil.
1168 Then the BODY is executed.
1169 Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.
1170 If no throw happens, `catch' returns the value of the last BODY form.
1171 If a throw happens, it specifies the value to return from `catch'.
1172 usage: (catch TAG BODY...) */)
1176 register Lisp_Object tag
;
1177 struct gcpro gcpro1
;
1180 tag
= Feval (Fcar (args
));
1182 return internal_catch (tag
, Fprogn
, Fcdr (args
));
1185 /* Set up a catch, then call C function FUNC on argument ARG.
1186 FUNC should return a Lisp_Object.
1187 This is how catches are done from within C code. */
1190 internal_catch (tag
, func
, arg
)
1192 Lisp_Object (*func
) ();
1195 /* This structure is made part of the chain `catchlist'. */
1198 /* Fill in the components of c, and put it on the list. */
1202 c
.backlist
= backtrace_list
;
1203 c
.handlerlist
= handlerlist
;
1204 c
.lisp_eval_depth
= lisp_eval_depth
;
1205 c
.pdlcount
= SPECPDL_INDEX ();
1206 c
.poll_suppress_count
= poll_suppress_count
;
1207 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1208 c
.gcpro
= gcprolist
;
1209 c
.byte_stack
= byte_stack_list
;
1213 if (! _setjmp (c
.jmp
))
1214 c
.val
= (*func
) (arg
);
1216 /* Throw works by a longjmp that comes right here. */
1221 /* Unwind the specbind, catch, and handler stacks back to CATCH, and
1222 jump to that CATCH, returning VALUE as the value of that catch.
1224 This is the guts Fthrow and Fsignal; they differ only in the way
1225 they choose the catch tag to throw to. A catch tag for a
1226 condition-case form has a TAG of Qnil.
1228 Before each catch is discarded, unbind all special bindings and
1229 execute all unwind-protect clauses made above that catch. Unwind
1230 the handler stack as we go, so that the proper handlers are in
1231 effect for each unwind-protect clause we run. At the end, restore
1232 some static info saved in CATCH, and longjmp to the location
1235 This is used for correct unwinding in Fthrow and Fsignal. */
1238 unwind_to_catch (catch, value
)
1239 struct catchtag
*catch;
1242 register int last_time
;
1244 /* Save the value in the tag. */
1247 /* Restore certain special C variables. */
1248 set_poll_suppress_count (catch->poll_suppress_count
);
1249 UNBLOCK_INPUT_TO (catch->interrupt_input_blocked
);
1250 handling_signal
= 0;
1255 last_time
= catchlist
== catch;
1257 /* Unwind the specpdl stack, and then restore the proper set of
1259 unbind_to (catchlist
->pdlcount
, Qnil
);
1260 handlerlist
= catchlist
->handlerlist
;
1261 catchlist
= catchlist
->next
;
1263 while (! last_time
);
1266 /* If x_catch_errors was done, turn it off now.
1267 (First we give unbind_to a chance to do that.) */
1268 x_fully_uncatch_errors ();
1271 byte_stack_list
= catch->byte_stack
;
1272 gcprolist
= catch->gcpro
;
1275 gcpro_level
= gcprolist
->level
+ 1;
1279 backtrace_list
= catch->backlist
;
1280 lisp_eval_depth
= catch->lisp_eval_depth
;
1282 _longjmp (catch->jmp
, 1);
1285 DEFUN ("throw", Fthrow
, Sthrow
, 2, 2, 0,
1286 doc
: /* Throw to the catch for TAG and return VALUE from it.
1287 Both TAG and VALUE are evalled. */)
1289 register Lisp_Object tag
, value
;
1291 register struct catchtag
*c
;
1296 for (c
= catchlist
; c
; c
= c
->next
)
1298 if (EQ (c
->tag
, tag
))
1299 unwind_to_catch (c
, value
);
1301 tag
= Fsignal (Qno_catch
, Fcons (tag
, Fcons (value
, Qnil
)));
1306 DEFUN ("unwind-protect", Funwind_protect
, Sunwind_protect
, 1, UNEVALLED
, 0,
1307 doc
: /* Do BODYFORM, protecting with UNWINDFORMS.
1308 If BODYFORM completes normally, its value is returned
1309 after executing the UNWINDFORMS.
1310 If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.
1311 usage: (unwind-protect BODYFORM UNWINDFORMS...) */)
1316 int count
= SPECPDL_INDEX ();
1318 record_unwind_protect (Fprogn
, Fcdr (args
));
1319 val
= Feval (Fcar (args
));
1320 return unbind_to (count
, val
);
1323 /* Chain of condition handlers currently in effect.
1324 The elements of this chain are contained in the stack frames
1325 of Fcondition_case and internal_condition_case.
1326 When an error is signaled (by calling Fsignal, below),
1327 this chain is searched for an element that applies. */
1329 struct handler
*handlerlist
;
1331 DEFUN ("condition-case", Fcondition_case
, Scondition_case
, 2, UNEVALLED
, 0,
1332 doc
: /* Regain control when an error is signaled.
1333 Executes BODYFORM and returns its value if no error happens.
1334 Each element of HANDLERS looks like (CONDITION-NAME BODY...)
1335 where the BODY is made of Lisp expressions.
1337 A handler is applicable to an error
1338 if CONDITION-NAME is one of the error's condition names.
1339 If an error happens, the first applicable handler is run.
1341 The car of a handler may be a list of condition names
1342 instead of a single condition name.
1344 When a handler handles an error,
1345 control returns to the condition-case and the handler BODY... is executed
1346 with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).
1347 VAR may be nil; then you do not get access to the signal information.
1349 The value of the last BODY form is returned from the condition-case.
1350 See also the function `signal' for more info.
1351 usage: (condition-case VAR BODYFORM &rest HANDLERS) */)
1355 register Lisp_Object bodyform
, handlers
;
1356 volatile Lisp_Object var
;
1359 bodyform
= Fcar (Fcdr (args
));
1360 handlers
= Fcdr (Fcdr (args
));
1362 return internal_lisp_condition_case (var
, bodyform
, handlers
);
1365 /* Like Fcondition_case, but the args are separate
1366 rather than passed in a list. Used by Fbyte_code. */
1369 internal_lisp_condition_case (var
, bodyform
, handlers
)
1370 volatile Lisp_Object var
;
1371 Lisp_Object bodyform
, handlers
;
1379 for (val
= handlers
; CONSP (val
); val
= XCDR (val
))
1385 && (SYMBOLP (XCAR (tem
))
1386 || CONSP (XCAR (tem
))))))
1387 error ("Invalid condition handler", tem
);
1392 c
.backlist
= backtrace_list
;
1393 c
.handlerlist
= handlerlist
;
1394 c
.lisp_eval_depth
= lisp_eval_depth
;
1395 c
.pdlcount
= SPECPDL_INDEX ();
1396 c
.poll_suppress_count
= poll_suppress_count
;
1397 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1398 c
.gcpro
= gcprolist
;
1399 c
.byte_stack
= byte_stack_list
;
1400 if (_setjmp (c
.jmp
))
1403 specbind (h
.var
, c
.val
);
1404 val
= Fprogn (Fcdr (h
.chosen_clause
));
1406 /* Note that this just undoes the binding of h.var; whoever
1407 longjumped to us unwound the stack to c.pdlcount before
1409 unbind_to (c
.pdlcount
, Qnil
);
1416 h
.handler
= handlers
;
1417 h
.next
= handlerlist
;
1421 val
= Feval (bodyform
);
1423 handlerlist
= h
.next
;
1427 /* Call the function BFUN with no arguments, catching errors within it
1428 according to HANDLERS. If there is an error, call HFUN with
1429 one argument which is the data that describes the error:
1432 HANDLERS can be a list of conditions to catch.
1433 If HANDLERS is Qt, catch all errors.
1434 If HANDLERS is Qerror, catch all errors
1435 but allow the debugger to run if that is enabled. */
1438 internal_condition_case (bfun
, handlers
, hfun
)
1439 Lisp_Object (*bfun
) ();
1440 Lisp_Object handlers
;
1441 Lisp_Object (*hfun
) ();
1447 /* Since Fsignal will close off all calls to x_catch_errors,
1448 we will get the wrong results if some are not closed now. */
1450 if (x_catching_errors ())
1456 c
.backlist
= backtrace_list
;
1457 c
.handlerlist
= handlerlist
;
1458 c
.lisp_eval_depth
= lisp_eval_depth
;
1459 c
.pdlcount
= SPECPDL_INDEX ();
1460 c
.poll_suppress_count
= poll_suppress_count
;
1461 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1462 c
.gcpro
= gcprolist
;
1463 c
.byte_stack
= byte_stack_list
;
1464 if (_setjmp (c
.jmp
))
1466 return (*hfun
) (c
.val
);
1470 h
.handler
= handlers
;
1472 h
.next
= handlerlist
;
1478 handlerlist
= h
.next
;
1482 /* Like internal_condition_case but call BFUN with ARG as its argument. */
1485 internal_condition_case_1 (bfun
, arg
, handlers
, hfun
)
1486 Lisp_Object (*bfun
) ();
1488 Lisp_Object handlers
;
1489 Lisp_Object (*hfun
) ();
1495 /* Since Fsignal will close off all calls to x_catch_errors,
1496 we will get the wrong results if some are not closed now. */
1498 if (x_catching_errors ())
1504 c
.backlist
= backtrace_list
;
1505 c
.handlerlist
= handlerlist
;
1506 c
.lisp_eval_depth
= lisp_eval_depth
;
1507 c
.pdlcount
= SPECPDL_INDEX ();
1508 c
.poll_suppress_count
= poll_suppress_count
;
1509 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1510 c
.gcpro
= gcprolist
;
1511 c
.byte_stack
= byte_stack_list
;
1512 if (_setjmp (c
.jmp
))
1514 return (*hfun
) (c
.val
);
1518 h
.handler
= handlers
;
1520 h
.next
= handlerlist
;
1524 val
= (*bfun
) (arg
);
1526 handlerlist
= h
.next
;
1531 /* Like internal_condition_case but call BFUN with NARGS as first,
1532 and ARGS as second argument. */
1535 internal_condition_case_2 (bfun
, nargs
, args
, handlers
, hfun
)
1536 Lisp_Object (*bfun
) ();
1539 Lisp_Object handlers
;
1540 Lisp_Object (*hfun
) ();
1546 /* Since Fsignal will close off all calls to x_catch_errors,
1547 we will get the wrong results if some are not closed now. */
1549 if (x_catching_errors ())
1555 c
.backlist
= backtrace_list
;
1556 c
.handlerlist
= handlerlist
;
1557 c
.lisp_eval_depth
= lisp_eval_depth
;
1558 c
.pdlcount
= SPECPDL_INDEX ();
1559 c
.poll_suppress_count
= poll_suppress_count
;
1560 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1561 c
.gcpro
= gcprolist
;
1562 c
.byte_stack
= byte_stack_list
;
1563 if (_setjmp (c
.jmp
))
1565 return (*hfun
) (c
.val
);
1569 h
.handler
= handlers
;
1571 h
.next
= handlerlist
;
1575 val
= (*bfun
) (nargs
, args
);
1577 handlerlist
= h
.next
;
1582 static Lisp_Object find_handler_clause
P_ ((Lisp_Object
, Lisp_Object
,
1583 Lisp_Object
, Lisp_Object
,
1586 DEFUN ("signal", Fsignal
, Ssignal
, 2, 2, 0,
1587 doc
: /* Signal an error. Args are ERROR-SYMBOL and associated DATA.
1588 This function does not return.
1590 An error symbol is a symbol with an `error-conditions' property
1591 that is a list of condition names.
1592 A handler for any of those names will get to handle this signal.
1593 The symbol `error' should normally be one of them.
1595 DATA should be a list. Its elements are printed as part of the error message.
1596 See Info anchor `(elisp)Definition of signal' for some details on how this
1597 error message is constructed.
1598 If the signal is handled, DATA is made available to the handler.
1599 See also the function `condition-case'. */)
1600 (error_symbol
, data
)
1601 Lisp_Object error_symbol
, data
;
1603 /* When memory is full, ERROR-SYMBOL is nil,
1604 and DATA is (REAL-ERROR-SYMBOL . REAL-DATA).
1605 That is a special case--don't do this in other situations. */
1606 register struct handler
*allhandlers
= handlerlist
;
1607 Lisp_Object conditions
;
1608 extern int gc_in_progress
;
1609 extern int waiting_for_input
;
1610 Lisp_Object debugger_value
;
1612 Lisp_Object real_error_symbol
;
1613 struct backtrace
*bp
;
1615 immediate_quit
= handling_signal
= 0;
1617 if (gc_in_progress
|| waiting_for_input
)
1620 if (NILP (error_symbol
))
1621 real_error_symbol
= Fcar (data
);
1623 real_error_symbol
= error_symbol
;
1625 #if 0 /* rms: I don't know why this was here,
1626 but it is surely wrong for an error that is handled. */
1627 #ifdef HAVE_X_WINDOWS
1628 if (display_hourglass_p
)
1629 cancel_hourglass ();
1633 /* This hook is used by edebug. */
1634 if (! NILP (Vsignal_hook_function
)
1635 && ! NILP (error_symbol
))
1637 /* Edebug takes care of restoring these variables when it exits. */
1638 if (lisp_eval_depth
+ 20 > max_lisp_eval_depth
)
1639 max_lisp_eval_depth
= lisp_eval_depth
+ 20;
1641 if (SPECPDL_INDEX () + 40 > max_specpdl_size
)
1642 max_specpdl_size
= SPECPDL_INDEX () + 40;
1644 call2 (Vsignal_hook_function
, error_symbol
, data
);
1647 conditions
= Fget (real_error_symbol
, Qerror_conditions
);
1649 /* Remember from where signal was called. Skip over the frame for
1650 `signal' itself. If a frame for `error' follows, skip that,
1651 too. Don't do this when ERROR_SYMBOL is nil, because that
1652 is a memory-full error. */
1653 Vsignaling_function
= Qnil
;
1654 if (backtrace_list
&& !NILP (error_symbol
))
1656 bp
= backtrace_list
->next
;
1657 if (bp
&& bp
->function
&& EQ (*bp
->function
, Qerror
))
1659 if (bp
&& bp
->function
)
1660 Vsignaling_function
= *bp
->function
;
1663 for (; handlerlist
; handlerlist
= handlerlist
->next
)
1665 register Lisp_Object clause
;
1667 clause
= find_handler_clause (handlerlist
->handler
, conditions
,
1668 error_symbol
, data
, &debugger_value
);
1670 if (EQ (clause
, Qlambda
))
1672 /* We can't return values to code which signaled an error, but we
1673 can continue code which has signaled a quit. */
1674 if (EQ (real_error_symbol
, Qquit
))
1677 error ("Cannot return from the debugger in an error");
1682 Lisp_Object unwind_data
;
1683 struct handler
*h
= handlerlist
;
1685 handlerlist
= allhandlers
;
1687 if (NILP (error_symbol
))
1690 unwind_data
= Fcons (error_symbol
, data
);
1691 h
->chosen_clause
= clause
;
1692 unwind_to_catch (h
->tag
, unwind_data
);
1696 handlerlist
= allhandlers
;
1697 /* If no handler is present now, try to run the debugger,
1698 and if that fails, throw to top level. */
1699 find_handler_clause (Qerror
, conditions
, error_symbol
, data
, &debugger_value
);
1701 Fthrow (Qtop_level
, Qt
);
1703 if (! NILP (error_symbol
))
1704 data
= Fcons (error_symbol
, data
);
1706 string
= Ferror_message_string (data
);
1707 fatal ("%s", SDATA (string
), 0);
1710 /* Return nonzero iff LIST is a non-nil atom or
1711 a list containing one of CONDITIONS. */
1714 wants_debugger (list
, conditions
)
1715 Lisp_Object list
, conditions
;
1722 while (CONSP (conditions
))
1724 Lisp_Object
this, tail
;
1725 this = XCAR (conditions
);
1726 for (tail
= list
; CONSP (tail
); tail
= XCDR (tail
))
1727 if (EQ (XCAR (tail
), this))
1729 conditions
= XCDR (conditions
);
1734 /* Return 1 if an error with condition-symbols CONDITIONS,
1735 and described by SIGNAL-DATA, should skip the debugger
1736 according to debugger-ignored-errors. */
1739 skip_debugger (conditions
, data
)
1740 Lisp_Object conditions
, data
;
1743 int first_string
= 1;
1744 Lisp_Object error_message
;
1746 error_message
= Qnil
;
1747 for (tail
= Vdebug_ignored_errors
; CONSP (tail
); tail
= XCDR (tail
))
1749 if (STRINGP (XCAR (tail
)))
1753 error_message
= Ferror_message_string (data
);
1757 if (fast_string_match (XCAR (tail
), error_message
) >= 0)
1762 Lisp_Object contail
;
1764 for (contail
= conditions
; CONSP (contail
); contail
= XCDR (contail
))
1765 if (EQ (XCAR (tail
), XCAR (contail
)))
1773 /* Value of Qlambda means we have called debugger and user has continued.
1774 There are two ways to pass SIG and DATA:
1775 = SIG is the error symbol, and DATA is the rest of the data.
1776 = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
1777 This is for memory-full errors only.
1779 Store value returned from debugger into *DEBUGGER_VALUE_PTR.
1781 We need to increase max_specpdl_size temporarily around
1782 anything we do that can push on the specpdl, so as not to get
1783 a second error here in case we're handling specpdl overflow. */
1786 find_handler_clause (handlers
, conditions
, sig
, data
, debugger_value_ptr
)
1787 Lisp_Object handlers
, conditions
, sig
, data
;
1788 Lisp_Object
*debugger_value_ptr
;
1790 register Lisp_Object h
;
1791 register Lisp_Object tem
;
1793 if (EQ (handlers
, Qt
)) /* t is used by handlers for all conditions, set up by C code. */
1795 /* error is used similarly, but means print an error message
1796 and run the debugger if that is enabled. */
1797 if (EQ (handlers
, Qerror
)
1798 || !NILP (Vdebug_on_signal
)) /* This says call debugger even if
1799 there is a handler. */
1801 int debugger_called
= 0;
1802 Lisp_Object sig_symbol
, combined_data
;
1803 /* This is set to 1 if we are handling a memory-full error,
1804 because these must not run the debugger.
1805 (There is no room in memory to do that!) */
1806 int no_debugger
= 0;
1810 combined_data
= data
;
1811 sig_symbol
= Fcar (data
);
1816 combined_data
= Fcons (sig
, data
);
1820 if (wants_debugger (Vstack_trace_on_error
, conditions
))
1824 internal_with_output_to_temp_buffer ("*Backtrace*",
1825 (Lisp_Object (*) (Lisp_Object
)) Fbacktrace
,
1828 internal_with_output_to_temp_buffer ("*Backtrace*",
1834 && (EQ (sig_symbol
, Qquit
)
1836 : wants_debugger (Vdebug_on_error
, conditions
))
1837 && ! skip_debugger (conditions
, combined_data
)
1838 && when_entered_debugger
< num_nonmacro_input_events
)
1841 = call_debugger (Fcons (Qerror
,
1842 Fcons (combined_data
, Qnil
)));
1843 debugger_called
= 1;
1845 /* If there is no handler, return saying whether we ran the debugger. */
1846 if (EQ (handlers
, Qerror
))
1848 if (debugger_called
)
1853 for (h
= handlers
; CONSP (h
); h
= Fcdr (h
))
1855 Lisp_Object handler
, condit
;
1858 if (!CONSP (handler
))
1860 condit
= Fcar (handler
);
1861 /* Handle a single condition name in handler HANDLER. */
1862 if (SYMBOLP (condit
))
1864 tem
= Fmemq (Fcar (handler
), conditions
);
1868 /* Handle a list of condition names in handler HANDLER. */
1869 else if (CONSP (condit
))
1871 while (CONSP (condit
))
1873 tem
= Fmemq (Fcar (condit
), conditions
);
1876 condit
= XCDR (condit
);
1883 /* dump an error message; called like printf */
1887 error (m
, a1
, a2
, a3
)
1907 int used
= doprnt (buffer
, size
, m
, m
+ mlen
, 3, args
);
1912 buffer
= (char *) xrealloc (buffer
, size
);
1915 buffer
= (char *) xmalloc (size
);
1920 string
= build_string (buffer
);
1924 Fsignal (Qerror
, Fcons (string
, Qnil
));
1928 DEFUN ("commandp", Fcommandp
, Scommandp
, 1, 2, 0,
1929 doc
: /* Non-nil if FUNCTION makes provisions for interactive calling.
1930 This means it contains a description for how to read arguments to give it.
1931 The value is nil for an invalid function or a symbol with no function
1934 Interactively callable functions include strings and vectors (treated
1935 as keyboard macros), lambda-expressions that contain a top-level call
1936 to `interactive', autoload definitions made by `autoload' with non-nil
1937 fourth argument, and some of the built-in functions of Lisp.
1939 Also, a symbol satisfies `commandp' if its function definition does so.
1941 If the optional argument FOR-CALL-INTERACTIVELY is non-nil,
1942 then strings and vectors are not accepted. */)
1943 (function
, for_call_interactively
)
1944 Lisp_Object function
, for_call_interactively
;
1946 register Lisp_Object fun
;
1947 register Lisp_Object funcar
;
1951 fun
= indirect_function (fun
);
1952 if (EQ (fun
, Qunbound
))
1955 /* Emacs primitives are interactive if their DEFUN specifies an
1956 interactive spec. */
1959 if (XSUBR (fun
)->prompt
)
1965 /* Bytecode objects are interactive if they are long enough to
1966 have an element whose index is COMPILED_INTERACTIVE, which is
1967 where the interactive spec is stored. */
1968 else if (COMPILEDP (fun
))
1969 return ((ASIZE (fun
) & PSEUDOVECTOR_SIZE_MASK
) > COMPILED_INTERACTIVE
1972 /* Strings and vectors are keyboard macros. */
1973 if (NILP (for_call_interactively
) && (STRINGP (fun
) || VECTORP (fun
)))
1976 /* Lists may represent commands. */
1979 funcar
= XCAR (fun
);
1980 if (EQ (funcar
, Qlambda
))
1981 return Fassq (Qinteractive
, Fcdr (XCDR (fun
)));
1982 if (EQ (funcar
, Qautoload
))
1983 return Fcar (Fcdr (Fcdr (XCDR (fun
))));
1989 DEFUN ("autoload", Fautoload
, Sautoload
, 2, 5, 0,
1990 doc
: /* Define FUNCTION to autoload from FILE.
1991 FUNCTION is a symbol; FILE is a file name string to pass to `load'.
1992 Third arg DOCSTRING is documentation for the function.
1993 Fourth arg INTERACTIVE if non-nil says function can be called interactively.
1994 Fifth arg TYPE indicates the type of the object:
1995 nil or omitted says FUNCTION is a function,
1996 `keymap' says FUNCTION is really a keymap, and
1997 `macro' or t says FUNCTION is really a macro.
1998 Third through fifth args give info about the real definition.
1999 They default to nil.
2000 If FUNCTION is already defined other than as an autoload,
2001 this does nothing and returns nil. */)
2002 (function
, file
, docstring
, interactive
, type
)
2003 Lisp_Object function
, file
, docstring
, interactive
, type
;
2006 Lisp_Object args
[4];
2009 CHECK_SYMBOL (function
);
2010 CHECK_STRING (file
);
2012 /* If function is defined and not as an autoload, don't override */
2013 if (!EQ (XSYMBOL (function
)->function
, Qunbound
)
2014 && !(CONSP (XSYMBOL (function
)->function
)
2015 && EQ (XCAR (XSYMBOL (function
)->function
), Qautoload
)))
2018 if (NILP (Vpurify_flag
))
2019 /* Only add entries after dumping, because the ones before are
2020 not useful and else we get loads of them from the loaddefs.el. */
2021 LOADHIST_ATTACH (Fcons (Qautoload
, function
));
2025 args
[1] = docstring
;
2026 args
[2] = interactive
;
2029 return Ffset (function
, Fcons (Qautoload
, Flist (4, &args
[0])));
2030 #else /* NO_ARG_ARRAY */
2031 return Ffset (function
, Fcons (Qautoload
, Flist (4, &file
)));
2032 #endif /* not NO_ARG_ARRAY */
2036 un_autoload (oldqueue
)
2037 Lisp_Object oldqueue
;
2039 register Lisp_Object queue
, first
, second
;
2041 /* Queue to unwind is current value of Vautoload_queue.
2042 oldqueue is the shadowed value to leave in Vautoload_queue. */
2043 queue
= Vautoload_queue
;
2044 Vautoload_queue
= oldqueue
;
2045 while (CONSP (queue
))
2047 first
= XCAR (queue
);
2048 second
= Fcdr (first
);
2049 first
= Fcar (first
);
2050 if (EQ (first
, make_number (0)))
2053 Ffset (first
, second
);
2054 queue
= XCDR (queue
);
2059 /* Load an autoloaded function.
2060 FUNNAME is the symbol which is the function's name.
2061 FUNDEF is the autoload definition (a list). */
2064 do_autoload (fundef
, funname
)
2065 Lisp_Object fundef
, funname
;
2067 int count
= SPECPDL_INDEX ();
2068 Lisp_Object fun
, queue
, first
, second
;
2069 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2071 /* This is to make sure that loadup.el gives a clear picture
2072 of what files are preloaded and when. */
2073 if (! NILP (Vpurify_flag
))
2074 error ("Attempt to autoload %s while preparing to dump",
2075 SDATA (SYMBOL_NAME (funname
)));
2078 CHECK_SYMBOL (funname
);
2079 GCPRO3 (fun
, funname
, fundef
);
2081 /* Preserve the match data. */
2082 record_unwind_save_match_data ();
2084 /* Value saved here is to be restored into Vautoload_queue. */
2085 record_unwind_protect (un_autoload
, Vautoload_queue
);
2086 Vautoload_queue
= Qt
;
2087 Fload (Fcar (Fcdr (fundef
)), Qnil
, noninteractive
? Qt
: Qnil
, Qnil
, Qt
);
2089 /* Save the old autoloads, in case we ever do an unload. */
2090 queue
= Vautoload_queue
;
2091 while (CONSP (queue
))
2093 first
= XCAR (queue
);
2094 second
= Fcdr (first
);
2095 first
= Fcar (first
);
2097 if (SYMBOLP (first
) && CONSP (second
) && EQ (XCAR (second
), Qautoload
))
2098 Fput (first
, Qautoload
, (XCDR (second
)));
2100 queue
= XCDR (queue
);
2103 /* Once loading finishes, don't undo it. */
2104 Vautoload_queue
= Qt
;
2105 unbind_to (count
, Qnil
);
2107 fun
= Findirect_function (fun
, Qnil
);
2109 if (!NILP (Fequal (fun
, fundef
)))
2110 error ("Autoloading failed to define function %s",
2111 SDATA (SYMBOL_NAME (funname
)));
2116 DEFUN ("eval", Feval
, Seval
, 1, 1, 0,
2117 doc
: /* Evaluate FORM and return its value. */)
2121 Lisp_Object fun
, val
, original_fun
, original_args
;
2123 struct backtrace backtrace
;
2124 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2126 if (handling_signal
)
2130 return Fsymbol_value (form
);
2135 if ((consing_since_gc
> gc_cons_threshold
2136 && consing_since_gc
> gc_relative_threshold
)
2138 (!NILP (Vmemory_full
) && consing_since_gc
> memory_full_cons_threshold
))
2141 Fgarbage_collect ();
2145 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2147 if (max_lisp_eval_depth
< 100)
2148 max_lisp_eval_depth
= 100;
2149 if (lisp_eval_depth
> max_lisp_eval_depth
)
2150 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2153 original_fun
= Fcar (form
);
2154 original_args
= Fcdr (form
);
2156 backtrace
.next
= backtrace_list
;
2157 backtrace_list
= &backtrace
;
2158 backtrace
.function
= &original_fun
; /* This also protects them from gc */
2159 backtrace
.args
= &original_args
;
2160 backtrace
.nargs
= UNEVALLED
;
2161 backtrace
.evalargs
= 1;
2162 backtrace
.debug_on_exit
= 0;
2164 if (debug_on_next_call
)
2165 do_debug_on_call (Qt
);
2167 /* At this point, only original_fun and original_args
2168 have values that will be used below */
2170 fun
= Findirect_function (original_fun
, Qnil
);
2174 Lisp_Object numargs
;
2175 Lisp_Object argvals
[8];
2176 Lisp_Object args_left
;
2177 register int i
, maxargs
;
2179 args_left
= original_args
;
2180 numargs
= Flength (args_left
);
2184 if (XINT (numargs
) < XSUBR (fun
)->min_args
||
2185 (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< XINT (numargs
)))
2186 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (numargs
, Qnil
)));
2188 if (XSUBR (fun
)->max_args
== UNEVALLED
)
2190 backtrace
.evalargs
= 0;
2191 val
= (*XSUBR (fun
)->function
) (args_left
);
2195 if (XSUBR (fun
)->max_args
== MANY
)
2197 /* Pass a vector of evaluated arguments */
2199 register int argnum
= 0;
2201 vals
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
2203 GCPRO3 (args_left
, fun
, fun
);
2207 while (!NILP (args_left
))
2209 vals
[argnum
++] = Feval (Fcar (args_left
));
2210 args_left
= Fcdr (args_left
);
2211 gcpro3
.nvars
= argnum
;
2214 backtrace
.args
= vals
;
2215 backtrace
.nargs
= XINT (numargs
);
2217 val
= (*XSUBR (fun
)->function
) (XINT (numargs
), vals
);
2222 GCPRO3 (args_left
, fun
, fun
);
2223 gcpro3
.var
= argvals
;
2226 maxargs
= XSUBR (fun
)->max_args
;
2227 for (i
= 0; i
< maxargs
; args_left
= Fcdr (args_left
))
2229 argvals
[i
] = Feval (Fcar (args_left
));
2235 backtrace
.args
= argvals
;
2236 backtrace
.nargs
= XINT (numargs
);
2241 val
= (*XSUBR (fun
)->function
) ();
2244 val
= (*XSUBR (fun
)->function
) (argvals
[0]);
2247 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1]);
2250 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
2254 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
2255 argvals
[2], argvals
[3]);
2258 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2259 argvals
[3], argvals
[4]);
2262 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2263 argvals
[3], argvals
[4], argvals
[5]);
2266 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2267 argvals
[3], argvals
[4], argvals
[5],
2272 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2273 argvals
[3], argvals
[4], argvals
[5],
2274 argvals
[6], argvals
[7]);
2278 /* Someone has created a subr that takes more arguments than
2279 is supported by this code. We need to either rewrite the
2280 subr to use a different argument protocol, or add more
2281 cases to this switch. */
2285 if (COMPILEDP (fun
))
2286 val
= apply_lambda (fun
, original_args
, 1);
2290 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2291 funcar
= Fcar (fun
);
2292 if (!SYMBOLP (funcar
))
2293 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2294 if (EQ (funcar
, Qautoload
))
2296 do_autoload (fun
, original_fun
);
2299 if (EQ (funcar
, Qmacro
))
2300 val
= Feval (apply1 (Fcdr (fun
), original_args
));
2301 else if (EQ (funcar
, Qlambda
))
2302 val
= apply_lambda (fun
, original_args
, 1);
2304 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2310 if (backtrace
.debug_on_exit
)
2311 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
2312 backtrace_list
= backtrace
.next
;
2317 DEFUN ("apply", Fapply
, Sapply
, 2, MANY
, 0,
2318 doc
: /* Call FUNCTION with our remaining args, using our last arg as list of args.
2319 Then return the value FUNCTION returns.
2320 Thus, (apply '+ 1 2 '(3 4)) returns 10.
2321 usage: (apply FUNCTION &rest ARGUMENTS) */)
2326 register int i
, numargs
;
2327 register Lisp_Object spread_arg
;
2328 register Lisp_Object
*funcall_args
;
2330 struct gcpro gcpro1
;
2334 spread_arg
= args
[nargs
- 1];
2335 CHECK_LIST (spread_arg
);
2337 numargs
= XINT (Flength (spread_arg
));
2340 return Ffuncall (nargs
- 1, args
);
2341 else if (numargs
== 1)
2343 args
[nargs
- 1] = XCAR (spread_arg
);
2344 return Ffuncall (nargs
, args
);
2347 numargs
+= nargs
- 2;
2349 fun
= indirect_function (fun
);
2350 if (EQ (fun
, Qunbound
))
2352 /* Let funcall get the error */
2359 if (numargs
< XSUBR (fun
)->min_args
2360 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2361 goto funcall
; /* Let funcall get the error */
2362 else if (XSUBR (fun
)->max_args
> numargs
)
2364 /* Avoid making funcall cons up a yet another new vector of arguments
2365 by explicitly supplying nil's for optional values */
2366 funcall_args
= (Lisp_Object
*) alloca ((1 + XSUBR (fun
)->max_args
)
2367 * sizeof (Lisp_Object
));
2368 for (i
= numargs
; i
< XSUBR (fun
)->max_args
;)
2369 funcall_args
[++i
] = Qnil
;
2370 GCPRO1 (*funcall_args
);
2371 gcpro1
.nvars
= 1 + XSUBR (fun
)->max_args
;
2375 /* We add 1 to numargs because funcall_args includes the
2376 function itself as well as its arguments. */
2379 funcall_args
= (Lisp_Object
*) alloca ((1 + numargs
)
2380 * sizeof (Lisp_Object
));
2381 GCPRO1 (*funcall_args
);
2382 gcpro1
.nvars
= 1 + numargs
;
2385 bcopy (args
, funcall_args
, nargs
* sizeof (Lisp_Object
));
2386 /* Spread the last arg we got. Its first element goes in
2387 the slot that it used to occupy, hence this value of I. */
2389 while (!NILP (spread_arg
))
2391 funcall_args
[i
++] = XCAR (spread_arg
);
2392 spread_arg
= XCDR (spread_arg
);
2395 /* By convention, the caller needs to gcpro Ffuncall's args. */
2396 RETURN_UNGCPRO (Ffuncall (gcpro1
.nvars
, funcall_args
));
2399 /* Run hook variables in various ways. */
2401 enum run_hooks_condition
{to_completion
, until_success
, until_failure
};
2402 static Lisp_Object run_hook_with_args
P_ ((int, Lisp_Object
*,
2403 enum run_hooks_condition
));
2405 DEFUN ("run-hooks", Frun_hooks
, Srun_hooks
, 0, MANY
, 0,
2406 doc
: /* Run each hook in HOOKS.
2407 Each argument should be a symbol, a hook variable.
2408 These symbols are processed in the order specified.
2409 If a hook symbol has a non-nil value, that value may be a function
2410 or a list of functions to be called to run the hook.
2411 If the value is a function, it is called with no arguments.
2412 If it is a list, the elements are called, in order, with no arguments.
2414 Major modes should not use this function directly to run their mode
2415 hook; they should use `run-mode-hooks' instead.
2417 Do not use `make-local-variable' to make a hook variable buffer-local.
2418 Instead, use `add-hook' and specify t for the LOCAL argument.
2419 usage: (run-hooks &rest HOOKS) */)
2424 Lisp_Object hook
[1];
2427 for (i
= 0; i
< nargs
; i
++)
2430 run_hook_with_args (1, hook
, to_completion
);
2436 DEFUN ("run-hook-with-args", Frun_hook_with_args
,
2437 Srun_hook_with_args
, 1, MANY
, 0,
2438 doc
: /* Run HOOK with the specified arguments ARGS.
2439 HOOK should be a symbol, a hook variable. If HOOK has a non-nil
2440 value, that value may be a function or a list of functions to be
2441 called to run the hook. If the value is a function, it is called with
2442 the given arguments and its return value is returned. If it is a list
2443 of functions, those functions are called, in order,
2444 with the given arguments ARGS.
2445 It is best not to depend on the value returned by `run-hook-with-args',
2448 Do not use `make-local-variable' to make a hook variable buffer-local.
2449 Instead, use `add-hook' and specify t for the LOCAL argument.
2450 usage: (run-hook-with-args HOOK &rest ARGS) */)
2455 return run_hook_with_args (nargs
, args
, to_completion
);
2458 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success
,
2459 Srun_hook_with_args_until_success
, 1, MANY
, 0,
2460 doc
: /* Run HOOK with the specified arguments ARGS.
2461 HOOK should be a symbol, a hook variable. If HOOK has a non-nil
2462 value, that value may be a function or a list of functions to be
2463 called to run the hook. If the value is a function, it is called with
2464 the given arguments and its return value is returned.
2465 If it is a list of functions, those functions are called, in order,
2466 with the given arguments ARGS, until one of them
2467 returns a non-nil value. Then we return that value.
2468 However, if they all return nil, we return nil.
2470 Do not use `make-local-variable' to make a hook variable buffer-local.
2471 Instead, use `add-hook' and specify t for the LOCAL argument.
2472 usage: (run-hook-with-args-until-success HOOK &rest ARGS) */)
2477 return run_hook_with_args (nargs
, args
, until_success
);
2480 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure
,
2481 Srun_hook_with_args_until_failure
, 1, MANY
, 0,
2482 doc
: /* Run HOOK with the specified arguments ARGS.
2483 HOOK should be a symbol, a hook variable. If HOOK has a non-nil
2484 value, that value may be a function or a list of functions to be
2485 called to run the hook. If the value is a function, it is called with
2486 the given arguments and its return value is returned.
2487 If it is a list of functions, those functions are called, in order,
2488 with the given arguments ARGS, until one of them returns nil.
2489 Then we return nil. However, if they all return non-nil, we return non-nil.
2491 Do not use `make-local-variable' to make a hook variable buffer-local.
2492 Instead, use `add-hook' and specify t for the LOCAL argument.
2493 usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */)
2498 return run_hook_with_args (nargs
, args
, until_failure
);
2501 /* ARGS[0] should be a hook symbol.
2502 Call each of the functions in the hook value, passing each of them
2503 as arguments all the rest of ARGS (all NARGS - 1 elements).
2504 COND specifies a condition to test after each call
2505 to decide whether to stop.
2506 The caller (or its caller, etc) must gcpro all of ARGS,
2507 except that it isn't necessary to gcpro ARGS[0]. */
2510 run_hook_with_args (nargs
, args
, cond
)
2513 enum run_hooks_condition cond
;
2515 Lisp_Object sym
, val
, ret
;
2516 Lisp_Object globals
;
2517 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2519 /* If we are dying or still initializing,
2520 don't do anything--it would probably crash if we tried. */
2521 if (NILP (Vrun_hooks
))
2525 val
= find_symbol_value (sym
);
2526 ret
= (cond
== until_failure
? Qt
: Qnil
);
2528 if (EQ (val
, Qunbound
) || NILP (val
))
2530 else if (!CONSP (val
) || EQ (XCAR (val
), Qlambda
))
2533 return Ffuncall (nargs
, args
);
2538 GCPRO3 (sym
, val
, globals
);
2541 CONSP (val
) && ((cond
== to_completion
)
2542 || (cond
== until_success
? NILP (ret
)
2546 if (EQ (XCAR (val
), Qt
))
2548 /* t indicates this hook has a local binding;
2549 it means to run the global binding too. */
2551 for (globals
= Fdefault_value (sym
);
2552 CONSP (globals
) && ((cond
== to_completion
)
2553 || (cond
== until_success
? NILP (ret
)
2555 globals
= XCDR (globals
))
2557 args
[0] = XCAR (globals
);
2558 /* In a global value, t should not occur. If it does, we
2559 must ignore it to avoid an endless loop. */
2560 if (!EQ (args
[0], Qt
))
2561 ret
= Ffuncall (nargs
, args
);
2566 args
[0] = XCAR (val
);
2567 ret
= Ffuncall (nargs
, args
);
2576 /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual
2577 present value of that symbol.
2578 Call each element of FUNLIST,
2579 passing each of them the rest of ARGS.
2580 The caller (or its caller, etc) must gcpro all of ARGS,
2581 except that it isn't necessary to gcpro ARGS[0]. */
2584 run_hook_list_with_args (funlist
, nargs
, args
)
2585 Lisp_Object funlist
;
2591 Lisp_Object globals
;
2592 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2596 GCPRO3 (sym
, val
, globals
);
2598 for (val
= funlist
; CONSP (val
); val
= XCDR (val
))
2600 if (EQ (XCAR (val
), Qt
))
2602 /* t indicates this hook has a local binding;
2603 it means to run the global binding too. */
2605 for (globals
= Fdefault_value (sym
);
2607 globals
= XCDR (globals
))
2609 args
[0] = XCAR (globals
);
2610 /* In a global value, t should not occur. If it does, we
2611 must ignore it to avoid an endless loop. */
2612 if (!EQ (args
[0], Qt
))
2613 Ffuncall (nargs
, args
);
2618 args
[0] = XCAR (val
);
2619 Ffuncall (nargs
, args
);
2626 /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
2629 run_hook_with_args_2 (hook
, arg1
, arg2
)
2630 Lisp_Object hook
, arg1
, arg2
;
2632 Lisp_Object temp
[3];
2637 Frun_hook_with_args (3, temp
);
2640 /* Apply fn to arg */
2643 Lisp_Object fn
, arg
;
2645 struct gcpro gcpro1
;
2649 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2653 Lisp_Object args
[2];
2657 RETURN_UNGCPRO (Fapply (2, args
));
2659 #else /* not NO_ARG_ARRAY */
2660 RETURN_UNGCPRO (Fapply (2, &fn
));
2661 #endif /* not NO_ARG_ARRAY */
2664 /* Call function fn on no arguments */
2669 struct gcpro gcpro1
;
2672 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2675 /* Call function fn with 1 argument arg1 */
2679 Lisp_Object fn
, arg1
;
2681 struct gcpro gcpro1
;
2683 Lisp_Object args
[2];
2689 RETURN_UNGCPRO (Ffuncall (2, args
));
2690 #else /* not NO_ARG_ARRAY */
2693 RETURN_UNGCPRO (Ffuncall (2, &fn
));
2694 #endif /* not NO_ARG_ARRAY */
2697 /* Call function fn with 2 arguments arg1, arg2 */
2700 call2 (fn
, arg1
, arg2
)
2701 Lisp_Object fn
, arg1
, arg2
;
2703 struct gcpro gcpro1
;
2705 Lisp_Object args
[3];
2711 RETURN_UNGCPRO (Ffuncall (3, args
));
2712 #else /* not NO_ARG_ARRAY */
2715 RETURN_UNGCPRO (Ffuncall (3, &fn
));
2716 #endif /* not NO_ARG_ARRAY */
2719 /* Call function fn with 3 arguments arg1, arg2, arg3 */
2722 call3 (fn
, arg1
, arg2
, arg3
)
2723 Lisp_Object fn
, arg1
, arg2
, arg3
;
2725 struct gcpro gcpro1
;
2727 Lisp_Object args
[4];
2734 RETURN_UNGCPRO (Ffuncall (4, args
));
2735 #else /* not NO_ARG_ARRAY */
2738 RETURN_UNGCPRO (Ffuncall (4, &fn
));
2739 #endif /* not NO_ARG_ARRAY */
2742 /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */
2745 call4 (fn
, arg1
, arg2
, arg3
, arg4
)
2746 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
;
2748 struct gcpro gcpro1
;
2750 Lisp_Object args
[5];
2758 RETURN_UNGCPRO (Ffuncall (5, args
));
2759 #else /* not NO_ARG_ARRAY */
2762 RETURN_UNGCPRO (Ffuncall (5, &fn
));
2763 #endif /* not NO_ARG_ARRAY */
2766 /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */
2769 call5 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
)
2770 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
;
2772 struct gcpro gcpro1
;
2774 Lisp_Object args
[6];
2783 RETURN_UNGCPRO (Ffuncall (6, args
));
2784 #else /* not NO_ARG_ARRAY */
2787 RETURN_UNGCPRO (Ffuncall (6, &fn
));
2788 #endif /* not NO_ARG_ARRAY */
2791 /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */
2794 call6 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
)
2795 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
;
2797 struct gcpro gcpro1
;
2799 Lisp_Object args
[7];
2809 RETURN_UNGCPRO (Ffuncall (7, args
));
2810 #else /* not NO_ARG_ARRAY */
2813 RETURN_UNGCPRO (Ffuncall (7, &fn
));
2814 #endif /* not NO_ARG_ARRAY */
2817 /* The caller should GCPRO all the elements of ARGS. */
2819 DEFUN ("funcall", Ffuncall
, Sfuncall
, 1, MANY
, 0,
2820 doc
: /* Call first argument as a function, passing remaining arguments to it.
2821 Return the value that function returns.
2822 Thus, (funcall 'cons 'x 'y) returns (x . y).
2823 usage: (funcall FUNCTION &rest ARGUMENTS) */)
2830 int numargs
= nargs
- 1;
2831 Lisp_Object lisp_numargs
;
2833 struct backtrace backtrace
;
2834 register Lisp_Object
*internal_args
;
2838 if ((consing_since_gc
> gc_cons_threshold
2839 && consing_since_gc
> gc_relative_threshold
)
2841 (!NILP (Vmemory_full
) && consing_since_gc
> memory_full_cons_threshold
))
2842 Fgarbage_collect ();
2844 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2846 if (max_lisp_eval_depth
< 100)
2847 max_lisp_eval_depth
= 100;
2848 if (lisp_eval_depth
> max_lisp_eval_depth
)
2849 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2852 backtrace
.next
= backtrace_list
;
2853 backtrace_list
= &backtrace
;
2854 backtrace
.function
= &args
[0];
2855 backtrace
.args
= &args
[1];
2856 backtrace
.nargs
= nargs
- 1;
2857 backtrace
.evalargs
= 0;
2858 backtrace
.debug_on_exit
= 0;
2860 if (debug_on_next_call
)
2861 do_debug_on_call (Qlambda
);
2869 fun
= Findirect_function (fun
, Qnil
);
2873 if (numargs
< XSUBR (fun
)->min_args
2874 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2876 XSETFASTINT (lisp_numargs
, numargs
);
2877 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (lisp_numargs
, Qnil
)));
2880 if (XSUBR (fun
)->max_args
== UNEVALLED
)
2881 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2883 if (XSUBR (fun
)->max_args
== MANY
)
2885 val
= (*XSUBR (fun
)->function
) (numargs
, args
+ 1);
2889 if (XSUBR (fun
)->max_args
> numargs
)
2891 internal_args
= (Lisp_Object
*) alloca (XSUBR (fun
)->max_args
* sizeof (Lisp_Object
));
2892 bcopy (args
+ 1, internal_args
, numargs
* sizeof (Lisp_Object
));
2893 for (i
= numargs
; i
< XSUBR (fun
)->max_args
; i
++)
2894 internal_args
[i
] = Qnil
;
2897 internal_args
= args
+ 1;
2898 switch (XSUBR (fun
)->max_args
)
2901 val
= (*XSUBR (fun
)->function
) ();
2904 val
= (*XSUBR (fun
)->function
) (internal_args
[0]);
2907 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1]);
2910 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2914 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2915 internal_args
[2], internal_args
[3]);
2918 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2919 internal_args
[2], internal_args
[3],
2923 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2924 internal_args
[2], internal_args
[3],
2925 internal_args
[4], internal_args
[5]);
2928 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2929 internal_args
[2], internal_args
[3],
2930 internal_args
[4], internal_args
[5],
2935 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2936 internal_args
[2], internal_args
[3],
2937 internal_args
[4], internal_args
[5],
2938 internal_args
[6], internal_args
[7]);
2943 /* If a subr takes more than 8 arguments without using MANY
2944 or UNEVALLED, we need to extend this function to support it.
2945 Until this is done, there is no way to call the function. */
2949 if (COMPILEDP (fun
))
2950 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2954 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2955 funcar
= Fcar (fun
);
2956 if (!SYMBOLP (funcar
))
2957 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2958 if (EQ (funcar
, Qlambda
))
2959 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2960 else if (EQ (funcar
, Qautoload
))
2962 do_autoload (fun
, args
[0]);
2967 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2972 if (backtrace
.debug_on_exit
)
2973 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
2974 backtrace_list
= backtrace
.next
;
2979 apply_lambda (fun
, args
, eval_flag
)
2980 Lisp_Object fun
, args
;
2983 Lisp_Object args_left
;
2984 Lisp_Object numargs
;
2985 register Lisp_Object
*arg_vector
;
2986 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2988 register Lisp_Object tem
;
2990 numargs
= Flength (args
);
2991 arg_vector
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
2994 GCPRO3 (*arg_vector
, args_left
, fun
);
2997 for (i
= 0; i
< XINT (numargs
);)
2999 tem
= Fcar (args_left
), args_left
= Fcdr (args_left
);
3000 if (eval_flag
) tem
= Feval (tem
);
3001 arg_vector
[i
++] = tem
;
3009 backtrace_list
->args
= arg_vector
;
3010 backtrace_list
->nargs
= i
;
3012 backtrace_list
->evalargs
= 0;
3013 tem
= funcall_lambda (fun
, XINT (numargs
), arg_vector
);
3015 /* Do the debug-on-exit now, while arg_vector still exists. */
3016 if (backtrace_list
->debug_on_exit
)
3017 tem
= call_debugger (Fcons (Qexit
, Fcons (tem
, Qnil
)));
3018 /* Don't do it again when we return to eval. */
3019 backtrace_list
->debug_on_exit
= 0;
3023 /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
3024 and return the result of evaluation.
3025 FUN must be either a lambda-expression or a compiled-code object. */
3028 funcall_lambda (fun
, nargs
, arg_vector
)
3031 register Lisp_Object
*arg_vector
;
3033 Lisp_Object val
, syms_left
, next
;
3034 int count
= SPECPDL_INDEX ();
3035 int i
, optional
, rest
;
3039 syms_left
= XCDR (fun
);
3040 if (CONSP (syms_left
))
3041 syms_left
= XCAR (syms_left
);
3043 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
3045 else if (COMPILEDP (fun
))
3046 syms_left
= AREF (fun
, COMPILED_ARGLIST
);
3050 i
= optional
= rest
= 0;
3051 for (; CONSP (syms_left
); syms_left
= XCDR (syms_left
))
3055 next
= XCAR (syms_left
);
3056 while (!SYMBOLP (next
))
3057 next
= Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
3059 if (EQ (next
, Qand_rest
))
3061 else if (EQ (next
, Qand_optional
))
3065 specbind (next
, Flist (nargs
- i
, &arg_vector
[i
]));
3069 specbind (next
, arg_vector
[i
++]);
3071 return Fsignal (Qwrong_number_of_arguments
,
3072 Fcons (fun
, Fcons (make_number (nargs
), Qnil
)));
3074 specbind (next
, Qnil
);
3077 if (!NILP (syms_left
))
3078 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
3080 return Fsignal (Qwrong_number_of_arguments
,
3081 Fcons (fun
, Fcons (make_number (nargs
), Qnil
)));
3084 val
= Fprogn (XCDR (XCDR (fun
)));
3087 /* If we have not actually read the bytecode string
3088 and constants vector yet, fetch them from the file. */
3089 if (CONSP (AREF (fun
, COMPILED_BYTECODE
)))
3090 Ffetch_bytecode (fun
);
3091 val
= Fbyte_code (AREF (fun
, COMPILED_BYTECODE
),
3092 AREF (fun
, COMPILED_CONSTANTS
),
3093 AREF (fun
, COMPILED_STACK_DEPTH
));
3096 return unbind_to (count
, val
);
3099 DEFUN ("fetch-bytecode", Ffetch_bytecode
, Sfetch_bytecode
,
3101 doc
: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */)
3107 if (COMPILEDP (object
) && CONSP (AREF (object
, COMPILED_BYTECODE
)))
3109 tem
= read_doc_string (AREF (object
, COMPILED_BYTECODE
));
3112 tem
= AREF (object
, COMPILED_BYTECODE
);
3113 if (CONSP (tem
) && STRINGP (XCAR (tem
)))
3114 error ("Invalid byte code in %s", SDATA (XCAR (tem
)));
3116 error ("Invalid byte code");
3118 AREF (object
, COMPILED_BYTECODE
) = XCAR (tem
);
3119 AREF (object
, COMPILED_CONSTANTS
) = XCDR (tem
);
3127 register int count
= SPECPDL_INDEX ();
3128 if (specpdl_size
>= max_specpdl_size
)
3130 if (max_specpdl_size
< 400)
3131 max_specpdl_size
= 400;
3132 if (specpdl_size
>= max_specpdl_size
)
3134 Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil
));
3137 if (specpdl_size
> max_specpdl_size
)
3138 specpdl_size
= max_specpdl_size
;
3139 specpdl
= (struct specbinding
*) xrealloc (specpdl
, specpdl_size
* sizeof (struct specbinding
));
3140 specpdl_ptr
= specpdl
+ count
;
3144 specbind (symbol
, value
)
3145 Lisp_Object symbol
, value
;
3148 Lisp_Object valcontents
;
3150 CHECK_SYMBOL (symbol
);
3151 if (specpdl_ptr
== specpdl
+ specpdl_size
)
3154 /* The most common case is that of a non-constant symbol with a
3155 trivial value. Make that as fast as we can. */
3156 valcontents
= SYMBOL_VALUE (symbol
);
3157 if (!MISCP (valcontents
) && !SYMBOL_CONSTANT_P (symbol
))
3159 specpdl_ptr
->symbol
= symbol
;
3160 specpdl_ptr
->old_value
= valcontents
;
3161 specpdl_ptr
->func
= NULL
;
3163 SET_SYMBOL_VALUE (symbol
, value
);
3167 Lisp_Object valcontents
;
3169 ovalue
= find_symbol_value (symbol
);
3170 specpdl_ptr
->func
= 0;
3171 specpdl_ptr
->old_value
= ovalue
;
3173 valcontents
= XSYMBOL (symbol
)->value
;
3175 if (BUFFER_LOCAL_VALUEP (valcontents
)
3176 || SOME_BUFFER_LOCAL_VALUEP (valcontents
)
3177 || BUFFER_OBJFWDP (valcontents
))
3179 Lisp_Object where
, current_buffer
;
3181 current_buffer
= Fcurrent_buffer ();
3183 /* For a local variable, record both the symbol and which
3184 buffer's or frame's value we are saving. */
3185 if (!NILP (Flocal_variable_p (symbol
, Qnil
)))
3186 where
= current_buffer
;
3187 else if (!BUFFER_OBJFWDP (valcontents
)
3188 && XBUFFER_LOCAL_VALUE (valcontents
)->found_for_frame
)
3189 where
= XBUFFER_LOCAL_VALUE (valcontents
)->frame
;
3193 /* We're not using the `unused' slot in the specbinding
3194 structure because this would mean we have to do more
3195 work for simple variables. */
3196 specpdl_ptr
->symbol
= Fcons (symbol
, Fcons (where
, current_buffer
));
3198 /* If SYMBOL is a per-buffer variable which doesn't have a
3199 buffer-local value here, make the `let' change the global
3200 value by changing the value of SYMBOL in all buffers not
3201 having their own value. This is consistent with what
3202 happens with other buffer-local variables. */
3204 && BUFFER_OBJFWDP (valcontents
))
3207 Fset_default (symbol
, value
);
3212 specpdl_ptr
->symbol
= symbol
;
3215 if (BUFFER_OBJFWDP (ovalue
) || KBOARD_OBJFWDP (ovalue
))
3216 store_symval_forwarding (symbol
, ovalue
, value
, NULL
);
3218 set_internal (symbol
, value
, 0, 1);
3223 record_unwind_protect (function
, arg
)
3224 Lisp_Object (*function
) P_ ((Lisp_Object
));
3227 eassert (!handling_signal
);
3229 if (specpdl_ptr
== specpdl
+ specpdl_size
)
3231 specpdl_ptr
->func
= function
;
3232 specpdl_ptr
->symbol
= Qnil
;
3233 specpdl_ptr
->old_value
= arg
;
3238 unbind_to (count
, value
)
3242 Lisp_Object quitf
= Vquit_flag
;
3243 struct gcpro gcpro1
, gcpro2
;
3245 GCPRO2 (value
, quitf
);
3248 while (specpdl_ptr
!= specpdl
+ count
)
3250 /* Copy the binding, and decrement specpdl_ptr, before we do
3251 the work to unbind it. We decrement first
3252 so that an error in unbinding won't try to unbind
3253 the same entry again, and we copy the binding first
3254 in case more bindings are made during some of the code we run. */
3256 struct specbinding this_binding
;
3257 this_binding
= *--specpdl_ptr
;
3259 if (this_binding
.func
!= 0)
3260 (*this_binding
.func
) (this_binding
.old_value
);
3261 /* If the symbol is a list, it is really (SYMBOL WHERE
3262 . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a
3263 frame. If WHERE is a buffer or frame, this indicates we
3264 bound a variable that had a buffer-local or frame-local
3265 binding. WHERE nil means that the variable had the default
3266 value when it was bound. CURRENT-BUFFER is the buffer that
3267 was current when the variable was bound. */
3268 else if (CONSP (this_binding
.symbol
))
3270 Lisp_Object symbol
, where
;
3272 symbol
= XCAR (this_binding
.symbol
);
3273 where
= XCAR (XCDR (this_binding
.symbol
));
3276 Fset_default (symbol
, this_binding
.old_value
);
3277 else if (BUFFERP (where
))
3278 set_internal (symbol
, this_binding
.old_value
, XBUFFER (where
), 1);
3280 set_internal (symbol
, this_binding
.old_value
, NULL
, 1);
3284 /* If variable has a trivial value (no forwarding), we can
3285 just set it. No need to check for constant symbols here,
3286 since that was already done by specbind. */
3287 if (!MISCP (SYMBOL_VALUE (this_binding
.symbol
)))
3288 SET_SYMBOL_VALUE (this_binding
.symbol
, this_binding
.old_value
);
3290 set_internal (this_binding
.symbol
, this_binding
.old_value
, 0, 1);
3294 if (NILP (Vquit_flag
) && !NILP (quitf
))
3301 DEFUN ("backtrace-debug", Fbacktrace_debug
, Sbacktrace_debug
, 2, 2, 0,
3302 doc
: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.
3303 The debugger is entered when that frame exits, if the flag is non-nil. */)
3305 Lisp_Object level
, flag
;
3307 register struct backtrace
*backlist
= backtrace_list
;
3310 CHECK_NUMBER (level
);
3312 for (i
= 0; backlist
&& i
< XINT (level
); i
++)
3314 backlist
= backlist
->next
;
3318 backlist
->debug_on_exit
= !NILP (flag
);
3323 DEFUN ("backtrace", Fbacktrace
, Sbacktrace
, 0, 0, "",
3324 doc
: /* Print a trace of Lisp function calls currently active.
3325 Output stream used is value of `standard-output'. */)
3328 register struct backtrace
*backlist
= backtrace_list
;
3332 extern Lisp_Object Vprint_level
;
3333 struct gcpro gcpro1
;
3335 XSETFASTINT (Vprint_level
, 3);
3342 write_string (backlist
->debug_on_exit
? "* " : " ", 2);
3343 if (backlist
->nargs
== UNEVALLED
)
3345 Fprin1 (Fcons (*backlist
->function
, *backlist
->args
), Qnil
);
3346 write_string ("\n", -1);
3350 tem
= *backlist
->function
;
3351 Fprin1 (tem
, Qnil
); /* This can QUIT */
3352 write_string ("(", -1);
3353 if (backlist
->nargs
== MANY
)
3355 for (tail
= *backlist
->args
, i
= 0;
3357 tail
= Fcdr (tail
), i
++)
3359 if (i
) write_string (" ", -1);
3360 Fprin1 (Fcar (tail
), Qnil
);
3365 for (i
= 0; i
< backlist
->nargs
; i
++)
3367 if (i
) write_string (" ", -1);
3368 Fprin1 (backlist
->args
[i
], Qnil
);
3371 write_string (")\n", -1);
3373 backlist
= backlist
->next
;
3376 Vprint_level
= Qnil
;
3381 DEFUN ("backtrace-frame", Fbacktrace_frame
, Sbacktrace_frame
, 1, 1, NULL
,
3382 doc
: /* Return the function and arguments NFRAMES up from current execution point.
3383 If that frame has not evaluated the arguments yet (or is a special form),
3384 the value is (nil FUNCTION ARG-FORMS...).
3385 If that frame has evaluated its arguments and called its function already,
3386 the value is (t FUNCTION ARG-VALUES...).
3387 A &rest arg is represented as the tail of the list ARG-VALUES.
3388 FUNCTION is whatever was supplied as car of evaluated list,
3389 or a lambda expression for macro calls.
3390 If NFRAMES is more than the number of frames, the value is nil. */)
3392 Lisp_Object nframes
;
3394 register struct backtrace
*backlist
= backtrace_list
;
3398 CHECK_NATNUM (nframes
);
3400 /* Find the frame requested. */
3401 for (i
= 0; backlist
&& i
< XFASTINT (nframes
); i
++)
3402 backlist
= backlist
->next
;
3406 if (backlist
->nargs
== UNEVALLED
)
3407 return Fcons (Qnil
, Fcons (*backlist
->function
, *backlist
->args
));
3410 if (backlist
->nargs
== MANY
)
3411 tem
= *backlist
->args
;
3413 tem
= Flist (backlist
->nargs
, backlist
->args
);
3415 return Fcons (Qt
, Fcons (*backlist
->function
, tem
));
3423 register struct backtrace
*backlist
;
3426 for (backlist
= backtrace_list
; backlist
; backlist
= backlist
->next
)
3428 mark_object (*backlist
->function
);
3430 if (backlist
->nargs
== UNEVALLED
|| backlist
->nargs
== MANY
)
3433 i
= backlist
->nargs
- 1;
3435 mark_object (backlist
->args
[i
]);
3442 DEFVAR_INT ("max-specpdl-size", &max_specpdl_size
,
3443 doc
: /* *Limit on number of Lisp variable bindings and `unwind-protect's.
3444 If Lisp code tries to increase the total number past this amount,
3445 an error is signaled.
3446 You can safely use a value considerably larger than the default value,
3447 if that proves inconveniently small. However, if you increase it too far,
3448 Emacs could run out of memory trying to make the stack bigger. */);
3450 DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth
,
3451 doc
: /* *Limit on depth in `eval', `apply' and `funcall' before error.
3453 This limit serves to catch infinite recursions for you before they cause
3454 actual stack overflow in C, which would be fatal for Emacs.
3455 You can safely make it considerably larger than its default value,
3456 if that proves inconveniently small. However, if you increase it too far,
3457 Emacs could overflow the real C stack, and crash. */);
3459 DEFVAR_LISP ("quit-flag", &Vquit_flag
,
3460 doc
: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.
3461 If the value is t, that means do an ordinary quit.
3462 If the value equals `throw-on-input', that means quit by throwing
3463 to the tag specified in `throw-on-input'; it's for handling `while-no-input'.
3464 Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit',
3465 but `inhibit-quit' non-nil prevents anything from taking notice of that. */);
3468 DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit
,
3469 doc
: /* Non-nil inhibits C-g quitting from happening immediately.
3470 Note that `quit-flag' will still be set by typing C-g,
3471 so a quit will be signaled as soon as `inhibit-quit' is nil.
3472 To prevent this happening, set `quit-flag' to nil
3473 before making `inhibit-quit' nil. */);
3474 Vinhibit_quit
= Qnil
;
3476 Qinhibit_quit
= intern ("inhibit-quit");
3477 staticpro (&Qinhibit_quit
);
3479 Qautoload
= intern ("autoload");
3480 staticpro (&Qautoload
);
3482 Qdebug_on_error
= intern ("debug-on-error");
3483 staticpro (&Qdebug_on_error
);
3485 Qmacro
= intern ("macro");
3486 staticpro (&Qmacro
);
3488 Qdeclare
= intern ("declare");
3489 staticpro (&Qdeclare
);
3491 /* Note that the process handling also uses Qexit, but we don't want
3492 to staticpro it twice, so we just do it here. */
3493 Qexit
= intern ("exit");
3496 Qinteractive
= intern ("interactive");
3497 staticpro (&Qinteractive
);
3499 Qcommandp
= intern ("commandp");
3500 staticpro (&Qcommandp
);
3502 Qdefun
= intern ("defun");
3503 staticpro (&Qdefun
);
3505 Qand_rest
= intern ("&rest");
3506 staticpro (&Qand_rest
);
3508 Qand_optional
= intern ("&optional");
3509 staticpro (&Qand_optional
);
3511 DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error
,
3512 doc
: /* *Non-nil means errors display a backtrace buffer.
3513 More precisely, this happens for any error that is handled
3514 by the editor command loop.
3515 If the value is a list, an error only means to display a backtrace
3516 if one of its condition symbols appears in the list. */);
3517 Vstack_trace_on_error
= Qnil
;
3519 DEFVAR_LISP ("debug-on-error", &Vdebug_on_error
,
3520 doc
: /* *Non-nil means enter debugger if an error is signaled.
3521 Does not apply to errors handled by `condition-case' or those
3522 matched by `debug-ignored-errors'.
3523 If the value is a list, an error only means to enter the debugger
3524 if one of its condition symbols appears in the list.
3525 When you evaluate an expression interactively, this variable
3526 is temporarily non-nil if `eval-expression-debug-on-error' is non-nil.
3527 See also variable `debug-on-quit'. */);
3528 Vdebug_on_error
= Qnil
;
3530 DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors
,
3531 doc
: /* *List of errors for which the debugger should not be called.
3532 Each element may be a condition-name or a regexp that matches error messages.
3533 If any element applies to a given error, that error skips the debugger
3534 and just returns to top level.
3535 This overrides the variable `debug-on-error'.
3536 It does not apply to errors handled by `condition-case'. */);
3537 Vdebug_ignored_errors
= Qnil
;
3539 DEFVAR_BOOL ("debug-on-quit", &debug_on_quit
,
3540 doc
: /* *Non-nil means enter debugger if quit is signaled (C-g, for example).
3541 Does not apply if quit is handled by a `condition-case'. */);
3544 DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call
,
3545 doc
: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */);
3547 DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue
,
3548 doc
: /* Non-nil means debugger may continue execution.
3549 This is nil when the debugger is called under circumstances where it
3550 might not be safe to continue. */);
3551 debugger_may_continue
= 1;
3553 DEFVAR_LISP ("debugger", &Vdebugger
,
3554 doc
: /* Function to call to invoke debugger.
3555 If due to frame exit, args are `exit' and the value being returned;
3556 this function's value will be returned instead of that.
3557 If due to error, args are `error' and a list of the args to `signal'.
3558 If due to `apply' or `funcall' entry, one arg, `lambda'.
3559 If due to `eval' entry, one arg, t. */);
3562 DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function
,
3563 doc
: /* If non-nil, this is a function for `signal' to call.
3564 It receives the same arguments that `signal' was given.
3565 The Edebug package uses this to regain control. */);
3566 Vsignal_hook_function
= Qnil
;
3568 DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal
,
3569 doc
: /* *Non-nil means call the debugger regardless of condition handlers.
3570 Note that `debug-on-error', `debug-on-quit' and friends
3571 still determine whether to handle the particular condition. */);
3572 Vdebug_on_signal
= Qnil
;
3574 DEFVAR_LISP ("macro-declaration-function", &Vmacro_declaration_function
,
3575 doc
: /* Function to process declarations in a macro definition.
3576 The function will be called with two args MACRO and DECL.
3577 MACRO is the name of the macro being defined.
3578 DECL is a list `(declare ...)' containing the declarations.
3579 The value the function returns is not used. */);
3580 Vmacro_declaration_function
= Qnil
;
3582 Vrun_hooks
= intern ("run-hooks");
3583 staticpro (&Vrun_hooks
);
3585 staticpro (&Vautoload_queue
);
3586 Vautoload_queue
= Qnil
;
3587 staticpro (&Vsignaling_function
);
3588 Vsignaling_function
= Qnil
;
3599 defsubr (&Sfunction
);
3601 defsubr (&Sdefmacro
);
3603 defsubr (&Sdefvaralias
);
3604 defsubr (&Sdefconst
);
3605 defsubr (&Suser_variable_p
);
3609 defsubr (&Smacroexpand
);
3612 defsubr (&Sunwind_protect
);
3613 defsubr (&Scondition_case
);
3615 defsubr (&Sinteractive_p
);
3616 defsubr (&Scalled_interactively_p
);
3617 defsubr (&Scommandp
);
3618 defsubr (&Sautoload
);
3621 defsubr (&Sfuncall
);
3622 defsubr (&Srun_hooks
);
3623 defsubr (&Srun_hook_with_args
);
3624 defsubr (&Srun_hook_with_args_until_success
);
3625 defsubr (&Srun_hook_with_args_until_failure
);
3626 defsubr (&Sfetch_bytecode
);
3627 defsubr (&Sbacktrace_debug
);
3628 defsubr (&Sbacktrace
);
3629 defsubr (&Sbacktrace_frame
);
3632 /* arch-tag: 014a07aa-33ab-4a8f-a3d2-ee8a4a9ff7fb
3633 (do not change this comment) */