1 /* Evaluator for GNU Emacs Lisp interpreter.
2 Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1999, 2000, 2001,
3 2002, 2004, 2005 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, (OFEATURES . nil) 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 volatile 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
;
199 static Lisp_Object funcall_lambda
P_ ((Lisp_Object
, int, Lisp_Object
*));
205 specpdl
= (struct specbinding
*) xmalloc (specpdl_size
* sizeof (struct specbinding
));
206 specpdl_ptr
= specpdl
;
207 max_specpdl_size
= 1000;
208 max_lisp_eval_depth
= 300;
216 specpdl_ptr
= specpdl
;
221 debug_on_next_call
= 0;
226 /* This is less than the initial value of num_nonmacro_input_events. */
227 when_entered_debugger
= -1;
230 /* unwind-protect function used by call_debugger. */
233 restore_stack_limits (data
)
236 max_specpdl_size
= XINT (XCAR (data
));
237 max_lisp_eval_depth
= XINT (XCDR (data
));
241 /* Call the Lisp debugger, giving it argument ARG. */
247 int debug_while_redisplaying
;
248 int count
= SPECPDL_INDEX ();
250 int old_max
= max_specpdl_size
;
252 /* Temporarily bump up the stack limits,
253 so the debugger won't run out of stack. */
255 max_specpdl_size
+= 1;
256 record_unwind_protect (restore_stack_limits
,
257 Fcons (make_number (old_max
),
258 make_number (max_lisp_eval_depth
)));
259 max_specpdl_size
= old_max
;
261 if (lisp_eval_depth
+ 40 > max_lisp_eval_depth
)
262 max_lisp_eval_depth
= lisp_eval_depth
+ 40;
264 if (SPECPDL_INDEX () + 100 > max_specpdl_size
)
265 max_specpdl_size
= SPECPDL_INDEX () + 100;
267 #ifdef HAVE_X_WINDOWS
268 if (display_hourglass_p
)
272 debug_on_next_call
= 0;
273 when_entered_debugger
= num_nonmacro_input_events
;
275 /* Resetting redisplaying_p to 0 makes sure that debug output is
276 displayed if the debugger is invoked during redisplay. */
277 debug_while_redisplaying
= redisplaying_p
;
279 specbind (intern ("debugger-may-continue"),
280 debug_while_redisplaying
? Qnil
: Qt
);
281 specbind (Qinhibit_redisplay
, Qnil
);
282 specbind (Qdebug_on_error
, Qnil
);
284 #if 0 /* Binding this prevents execution of Lisp code during
285 redisplay, which necessarily leads to display problems. */
286 specbind (Qinhibit_eval_during_redisplay
, Qt
);
289 val
= apply1 (Vdebugger
, arg
);
291 /* Interrupting redisplay and resuming it later is not safe under
292 all circumstances. So, when the debugger returns, abort the
293 interrupted redisplay by going back to the top-level. */
294 if (debug_while_redisplaying
)
297 return unbind_to (count
, val
);
301 do_debug_on_call (code
)
304 debug_on_next_call
= 0;
305 backtrace_list
->debug_on_exit
= 1;
306 call_debugger (Fcons (code
, Qnil
));
309 /* NOTE!!! Every function that can call EVAL must protect its args
310 and temporaries from garbage collection while it needs them.
311 The definition of `For' shows what you have to do. */
313 DEFUN ("or", For
, Sor
, 0, UNEVALLED
, 0,
314 doc
: /* Eval args until one of them yields non-nil, then return that value.
315 The remaining args are not evalled at all.
316 If all args return nil, return nil.
317 usage: (or CONDITIONS ...) */)
321 register Lisp_Object val
= Qnil
;
328 val
= Feval (XCAR (args
));
338 DEFUN ("and", Fand
, Sand
, 0, UNEVALLED
, 0,
339 doc
: /* Eval args until one of them yields nil, then return nil.
340 The remaining args are not evalled at all.
341 If no arg yields nil, return the last arg's value.
342 usage: (and CONDITIONS ...) */)
346 register Lisp_Object val
= Qt
;
353 val
= Feval (XCAR (args
));
363 DEFUN ("if", Fif
, Sif
, 2, UNEVALLED
, 0,
364 doc
: /* If COND yields non-nil, do THEN, else do ELSE...
365 Returns the value of THEN or the value of the last of the ELSE's.
366 THEN must be one expression, but ELSE... can be zero or more expressions.
367 If COND yields nil, and there are no ELSE's, the value is nil.
368 usage: (if COND THEN ELSE...) */)
372 register Lisp_Object cond
;
376 cond
= Feval (Fcar (args
));
380 return Feval (Fcar (Fcdr (args
)));
381 return Fprogn (Fcdr (Fcdr (args
)));
384 DEFUN ("cond", Fcond
, Scond
, 0, UNEVALLED
, 0,
385 doc
: /* Try each clause until one succeeds.
386 Each clause looks like (CONDITION BODY...). CONDITION is evaluated
387 and, if the value is non-nil, this clause succeeds:
388 then the expressions in BODY are evaluated and the last one's
389 value is the value of the cond-form.
390 If no clause succeeds, cond returns nil.
391 If a clause has one element, as in (CONDITION),
392 CONDITION's value if non-nil is returned from the cond-form.
393 usage: (cond CLAUSES...) */)
397 register Lisp_Object clause
, val
;
404 clause
= Fcar (args
);
405 val
= Feval (Fcar (clause
));
408 if (!EQ (XCDR (clause
), Qnil
))
409 val
= Fprogn (XCDR (clause
));
419 DEFUN ("progn", Fprogn
, Sprogn
, 0, UNEVALLED
, 0,
420 doc
: /* Eval BODY forms sequentially and return value of last one.
421 usage: (progn BODY ...) */)
425 register Lisp_Object val
= Qnil
;
432 val
= Feval (XCAR (args
));
440 DEFUN ("prog1", Fprog1
, Sprog1
, 1, UNEVALLED
, 0,
441 doc
: /* Eval FIRST and BODY sequentially; value from FIRST.
442 The value of FIRST is saved during the evaluation of the remaining args,
443 whose values are discarded.
444 usage: (prog1 FIRST BODY...) */)
449 register Lisp_Object args_left
;
450 struct gcpro gcpro1
, gcpro2
;
451 register int argnum
= 0;
463 val
= Feval (Fcar (args_left
));
465 Feval (Fcar (args_left
));
466 args_left
= Fcdr (args_left
);
468 while (!NILP(args_left
));
474 DEFUN ("prog2", Fprog2
, Sprog2
, 2, UNEVALLED
, 0,
475 doc
: /* Eval FORM1, FORM2 and BODY sequentially; value from FORM2.
476 The value of FORM2 is saved during the evaluation of the
477 remaining args, whose values are discarded.
478 usage: (prog2 FORM1 FORM2 BODY...) */)
483 register Lisp_Object args_left
;
484 struct gcpro gcpro1
, gcpro2
;
485 register int argnum
= -1;
499 val
= Feval (Fcar (args_left
));
501 Feval (Fcar (args_left
));
502 args_left
= Fcdr (args_left
);
504 while (!NILP (args_left
));
510 DEFUN ("setq", Fsetq
, Ssetq
, 0, UNEVALLED
, 0,
511 doc
: /* Set each SYM to the value of its VAL.
512 The symbols SYM are variables; they are literal (not evaluated).
513 The values VAL are expressions; they are evaluated.
514 Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.
515 The second VAL is not computed until after the first SYM is set, and so on;
516 each VAL can use the new value of variables set earlier in the `setq'.
517 The return value of the `setq' form is the value of the last VAL.
518 usage: (setq SYM VAL SYM VAL ...) */)
522 register Lisp_Object args_left
;
523 register Lisp_Object val
, sym
;
534 val
= Feval (Fcar (Fcdr (args_left
)));
535 sym
= Fcar (args_left
);
537 args_left
= Fcdr (Fcdr (args_left
));
539 while (!NILP(args_left
));
545 DEFUN ("quote", Fquote
, Squote
, 1, UNEVALLED
, 0,
546 doc
: /* Return the argument, without evaluating it. `(quote x)' yields `x'.
547 usage: (quote ARG) */)
554 DEFUN ("function", Ffunction
, Sfunction
, 1, UNEVALLED
, 0,
555 doc
: /* Like `quote', but preferred for objects which are functions.
556 In byte compilation, `function' causes its argument to be compiled.
557 `quote' cannot do that.
558 usage: (function ARG) */)
566 DEFUN ("interactive-p", Finteractive_p
, Sinteractive_p
, 0, 0, 0,
567 doc
: /* Return t if the function was run directly by user input.
568 This means that the function was called with `call-interactively'
569 \(which includes being called as the binding of a key)
570 and input is currently coming from the keyboard (not in keyboard macro),
571 and Emacs is not running in batch mode (`noninteractive' is nil).
573 The only known proper use of `interactive-p' is in deciding whether to
574 display a helpful message, or how to display it. If you're thinking
575 of using it for any other purpose, it is quite likely that you're
576 making a mistake. Think: what do you want to do when the command is
577 called from a keyboard macro?
579 If you want to test whether your function was called with
580 `call-interactively', the way to do that is by adding an extra
581 optional argument, and making the `interactive' spec specify non-nil
582 unconditionally for that argument. (`p' is a good way to do this.) */)
585 return (INTERACTIVE
&& interactive_p (1)) ? Qt
: Qnil
;
589 DEFUN ("called-interactively-p", Fcalled_interactively_p
, Scalled_interactively_p
, 0, 0, 0,
590 doc
: /* Return t if the function using this was called with `call-interactively'.
591 This is used for implementing advice and other function-modifying
594 The cleanest way to test whether your function was called with
595 `call-interactively' is by adding an extra optional argument,
596 and making the `interactive' spec specify non-nil unconditionally
597 for that argument. (`p' is a good way to do this.) */)
600 return 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
);
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
);
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 and how Edebug should handle it. It looks like this:
690 The elements can look like this:
692 Set NAME's `lisp-indent-function' property to INDENT.
695 Set NAME's `edebug-form-spec' property to DEBUG. (This is
696 equivalent to writing a `def-edebug-spec' for the macro.)
697 usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */)
701 register Lisp_Object fn_name
;
702 register Lisp_Object defn
;
703 Lisp_Object lambda_list
, doc
, tail
;
705 fn_name
= Fcar (args
);
706 CHECK_SYMBOL (fn_name
);
707 lambda_list
= Fcar (Fcdr (args
));
708 tail
= Fcdr (Fcdr (args
));
711 if (STRINGP (Fcar (tail
)))
717 while (CONSP (Fcar (tail
))
718 && EQ (Fcar (Fcar (tail
)), Qdeclare
))
720 if (!NILP (Vmacro_declaration_function
))
724 call2 (Vmacro_declaration_function
, fn_name
, Fcar (tail
));
732 tail
= Fcons (lambda_list
, tail
);
734 tail
= Fcons (lambda_list
, Fcons (doc
, tail
));
735 defn
= Fcons (Qmacro
, Fcons (Qlambda
, tail
));
737 if (!NILP (Vpurify_flag
))
738 defn
= Fpurecopy (defn
);
739 if (CONSP (XSYMBOL (fn_name
)->function
)
740 && EQ (XCAR (XSYMBOL (fn_name
)->function
), Qautoload
))
741 LOADHIST_ATTACH (Fcons (Qt
, fn_name
));
742 Ffset (fn_name
, defn
);
743 LOADHIST_ATTACH (Fcons (Qdefun
, fn_name
));
748 DEFUN ("defvaralias", Fdefvaralias
, Sdefvaralias
, 2, 3, 0,
749 doc
: /* Make NEW-ALIAS a variable alias for symbol BASE-VARIABLE.
750 Setting the value of NEW-ALIAS will subsequently set the value of BASE-VARIABLE,
751 and getting the value of NEW-ALIAS will return the value BASE-VARIABLE has.
752 Third arg DOCSTRING, if non-nil, is documentation for NEW-ALIAS. If it is
753 omitted or nil, NEW-ALIAS gets the documentation string of BASE-VARIABLE,
754 or of the variable at the end of the chain of aliases, if BASE-VARIABLE is
756 The return value is BASE-VARIABLE. */)
757 (new_alias
, base_variable
, docstring
)
758 Lisp_Object new_alias
, base_variable
, docstring
;
760 struct Lisp_Symbol
*sym
;
762 CHECK_SYMBOL (new_alias
);
763 CHECK_SYMBOL (base_variable
);
765 if (SYMBOL_CONSTANT_P (new_alias
))
766 error ("Cannot make a constant an alias");
768 sym
= XSYMBOL (new_alias
);
769 sym
->indirect_variable
= 1;
770 sym
->value
= base_variable
;
771 sym
->constant
= SYMBOL_CONSTANT_P (base_variable
);
772 LOADHIST_ATTACH (new_alias
);
773 if (!NILP (docstring
))
774 Fput (new_alias
, Qvariable_documentation
, docstring
);
776 Fput (new_alias
, Qvariable_documentation
, Qnil
);
778 return base_variable
;
782 DEFUN ("defvar", Fdefvar
, Sdefvar
, 1, UNEVALLED
, 0,
783 doc
: /* Define SYMBOL as a variable, and return SYMBOL.
784 You are not required to define a variable in order to use it,
785 but the definition can supply documentation and an initial value
786 in a way that tags can recognize.
788 INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.
789 If SYMBOL is buffer-local, its default value is what is set;
790 buffer-local values are not affected.
791 INITVALUE and DOCSTRING are optional.
792 If DOCSTRING starts with *, this variable is identified as a user option.
793 This means that M-x set-variable recognizes it.
794 See also `user-variable-p'.
795 If INITVALUE is missing, SYMBOL's value is not set.
797 If SYMBOL has a local binding, then this form affects the local
798 binding. This is usually not what you want. Thus, if you need to
799 load a file defining variables, with this form or with `defconst' or
800 `defcustom', you should always load that file _outside_ any bindings
801 for these variables. \(`defconst' and `defcustom' behave similarly in
803 usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */)
807 register Lisp_Object sym
, tem
, tail
;
811 if (!NILP (Fcdr (Fcdr (tail
))))
812 error ("Too many arguments");
814 tem
= Fdefault_boundp (sym
);
817 if (SYMBOL_CONSTANT_P (sym
))
819 /* For upward compatibility, allow (defvar :foo (quote :foo)). */
820 Lisp_Object tem
= Fcar (tail
);
822 && EQ (XCAR (tem
), Qquote
)
823 && CONSP (XCDR (tem
))
824 && EQ (XCAR (XCDR (tem
)), sym
)))
825 error ("Constant symbol `%s' specified in defvar",
826 SDATA (SYMBOL_NAME (sym
)));
830 Fset_default (sym
, Feval (Fcar (tail
)));
832 { /* Check if there is really a global binding rather than just a let
833 binding that shadows the global unboundness of the var. */
834 volatile struct specbinding
*pdl
= specpdl_ptr
;
835 while (--pdl
>= specpdl
)
837 if (EQ (pdl
->symbol
, sym
) && !pdl
->func
838 && EQ (pdl
->old_value
, Qunbound
))
840 message_with_string ("Warning: defvar ignored because %s is let-bound",
841 SYMBOL_NAME (sym
), 1);
850 if (!NILP (Vpurify_flag
))
851 tem
= Fpurecopy (tem
);
852 Fput (sym
, Qvariable_documentation
, tem
);
854 LOADHIST_ATTACH (sym
);
857 /* Simple (defvar <var>) should not count as a definition at all.
858 It could get in the way of other definitions, and unloading this
859 package could try to make the variable unbound. */
865 DEFUN ("defconst", Fdefconst
, Sdefconst
, 2, UNEVALLED
, 0,
866 doc
: /* Define SYMBOL as a constant variable.
867 The intent is that neither programs nor users should ever change this value.
868 Always sets the value of SYMBOL to the result of evalling INITVALUE.
869 If SYMBOL is buffer-local, its default value is what is set;
870 buffer-local values are not affected.
871 DOCSTRING is optional.
873 If SYMBOL has a local binding, then this form sets the local binding's
874 value. However, you should normally not make local bindings for
875 variables defined with this form.
876 usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */)
880 register Lisp_Object sym
, tem
;
883 if (!NILP (Fcdr (Fcdr (Fcdr (args
)))))
884 error ("Too many arguments");
886 tem
= Feval (Fcar (Fcdr (args
)));
887 if (!NILP (Vpurify_flag
))
888 tem
= Fpurecopy (tem
);
889 Fset_default (sym
, tem
);
890 tem
= Fcar (Fcdr (Fcdr (args
)));
893 if (!NILP (Vpurify_flag
))
894 tem
= Fpurecopy (tem
);
895 Fput (sym
, Qvariable_documentation
, tem
);
897 LOADHIST_ATTACH (sym
);
901 /* Error handler used in Fuser_variable_p. */
903 user_variable_p_eh (ignore
)
909 DEFUN ("user-variable-p", Fuser_variable_p
, Suser_variable_p
, 1, 1, 0,
910 doc
: /* Return t if VARIABLE is intended to be set and modified by users.
911 \(The alternative is a variable used internally in a Lisp program.)
912 A variable is a user variable if
913 \(1) the first character of its documentation is `*', or
914 \(2) it is customizable (its property list contains a non-nil value
915 of `standard-value' or `custom-autoload'), or
916 \(3) it is an alias for another user variable.
917 Return nil if VARIABLE is an alias and there is a loop in the
918 chain of symbols. */)
920 Lisp_Object variable
;
922 Lisp_Object documentation
;
924 if (!SYMBOLP (variable
))
927 /* If indirect and there's an alias loop, don't check anything else. */
928 if (XSYMBOL (variable
)->indirect_variable
929 && NILP (internal_condition_case_1 (indirect_variable
, variable
,
930 Qt
, user_variable_p_eh
)))
935 documentation
= Fget (variable
, Qvariable_documentation
);
936 if (INTEGERP (documentation
) && XINT (documentation
) < 0)
938 if (STRINGP (documentation
)
939 && ((unsigned char) SREF (documentation
, 0) == '*'))
941 /* If it is (STRING . INTEGER), a negative integer means a user variable. */
942 if (CONSP (documentation
)
943 && STRINGP (XCAR (documentation
))
944 && INTEGERP (XCDR (documentation
))
945 && XINT (XCDR (documentation
)) < 0)
947 /* Customizable? See `custom-variable-p'. */
948 if ((!NILP (Fget (variable
, intern ("standard-value"))))
949 || (!NILP (Fget (variable
, intern ("custom-autoload")))))
952 if (!XSYMBOL (variable
)->indirect_variable
)
955 /* An indirect variable? Let's follow the chain. */
956 variable
= XSYMBOL (variable
)->value
;
960 DEFUN ("let*", FletX
, SletX
, 1, UNEVALLED
, 0,
961 doc
: /* Bind variables according to VARLIST then eval BODY.
962 The value of the last form in BODY is returned.
963 Each element of VARLIST is a symbol (which is bound to nil)
964 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
965 Each VALUEFORM can refer to the symbols already bound by this VARLIST.
966 usage: (let* VARLIST BODY...) */)
970 Lisp_Object varlist
, val
, elt
;
971 int count
= SPECPDL_INDEX ();
972 struct gcpro gcpro1
, gcpro2
, gcpro3
;
974 GCPRO3 (args
, elt
, varlist
);
976 varlist
= Fcar (args
);
977 while (!NILP (varlist
))
980 elt
= Fcar (varlist
);
982 specbind (elt
, Qnil
);
983 else if (! NILP (Fcdr (Fcdr (elt
))))
985 Fcons (build_string ("`let' bindings can have only one value-form"),
989 val
= Feval (Fcar (Fcdr (elt
)));
990 specbind (Fcar (elt
), val
);
992 varlist
= Fcdr (varlist
);
995 val
= Fprogn (Fcdr (args
));
996 return unbind_to (count
, val
);
999 DEFUN ("let", Flet
, Slet
, 1, UNEVALLED
, 0,
1000 doc
: /* Bind variables according to VARLIST then eval BODY.
1001 The value of the last form in BODY is returned.
1002 Each element of VARLIST is a symbol (which is bound to nil)
1003 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
1004 All the VALUEFORMs are evalled before any symbols are bound.
1005 usage: (let VARLIST BODY...) */)
1009 Lisp_Object
*temps
, tem
;
1010 register Lisp_Object elt
, varlist
;
1011 int count
= SPECPDL_INDEX ();
1012 register int argnum
;
1013 struct gcpro gcpro1
, gcpro2
;
1015 varlist
= Fcar (args
);
1017 /* Make space to hold the values to give the bound variables */
1018 elt
= Flength (varlist
);
1019 temps
= (Lisp_Object
*) alloca (XFASTINT (elt
) * sizeof (Lisp_Object
));
1021 /* Compute the values and store them in `temps' */
1023 GCPRO2 (args
, *temps
);
1026 for (argnum
= 0; !NILP (varlist
); varlist
= Fcdr (varlist
))
1029 elt
= Fcar (varlist
);
1031 temps
[argnum
++] = Qnil
;
1032 else if (! NILP (Fcdr (Fcdr (elt
))))
1034 Fcons (build_string ("`let' bindings can have only one value-form"),
1037 temps
[argnum
++] = Feval (Fcar (Fcdr (elt
)));
1038 gcpro2
.nvars
= argnum
;
1042 varlist
= Fcar (args
);
1043 for (argnum
= 0; !NILP (varlist
); varlist
= Fcdr (varlist
))
1045 elt
= Fcar (varlist
);
1046 tem
= temps
[argnum
++];
1048 specbind (elt
, tem
);
1050 specbind (Fcar (elt
), tem
);
1053 elt
= Fprogn (Fcdr (args
));
1054 return unbind_to (count
, elt
);
1057 DEFUN ("while", Fwhile
, Swhile
, 1, UNEVALLED
, 0,
1058 doc
: /* If TEST yields non-nil, eval BODY... and repeat.
1059 The order of execution is thus TEST, BODY, TEST, BODY and so on
1060 until TEST returns nil.
1061 usage: (while TEST BODY...) */)
1065 Lisp_Object test
, body
;
1066 struct gcpro gcpro1
, gcpro2
;
1068 GCPRO2 (test
, body
);
1072 while (!NILP (Feval (test
)))
1082 DEFUN ("macroexpand", Fmacroexpand
, Smacroexpand
, 1, 2, 0,
1083 doc
: /* Return result of expanding macros at top level of FORM.
1084 If FORM is not a macro call, it is returned unchanged.
1085 Otherwise, the macro is expanded and the expansion is considered
1086 in place of FORM. When a non-macro-call results, it is returned.
1088 The second optional arg ENVIRONMENT specifies an environment of macro
1089 definitions to shadow the loaded ones for use in file byte-compilation. */)
1092 Lisp_Object environment
;
1094 /* With cleanups from Hallvard Furuseth. */
1095 register Lisp_Object expander
, sym
, def
, tem
;
1099 /* Come back here each time we expand a macro call,
1100 in case it expands into another macro call. */
1103 /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */
1104 def
= sym
= XCAR (form
);
1106 /* Trace symbols aliases to other symbols
1107 until we get a symbol that is not an alias. */
1108 while (SYMBOLP (def
))
1112 tem
= Fassq (sym
, environment
);
1115 def
= XSYMBOL (sym
)->function
;
1116 if (!EQ (def
, Qunbound
))
1121 /* Right now TEM is the result from SYM in ENVIRONMENT,
1122 and if TEM is nil then DEF is SYM's function definition. */
1125 /* SYM is not mentioned in ENVIRONMENT.
1126 Look at its function definition. */
1127 if (EQ (def
, Qunbound
) || !CONSP (def
))
1128 /* Not defined or definition not suitable */
1130 if (EQ (XCAR (def
), Qautoload
))
1132 /* Autoloading function: will it be a macro when loaded? */
1133 tem
= Fnth (make_number (4), def
);
1134 if (EQ (tem
, Qt
) || EQ (tem
, Qmacro
))
1135 /* Yes, load it and try again. */
1137 struct gcpro gcpro1
;
1139 do_autoload (def
, sym
);
1146 else if (!EQ (XCAR (def
), Qmacro
))
1148 else expander
= XCDR (def
);
1152 expander
= XCDR (tem
);
1153 if (NILP (expander
))
1156 form
= apply1 (expander
, XCDR (form
));
1161 DEFUN ("catch", Fcatch
, Scatch
, 1, UNEVALLED
, 0,
1162 doc
: /* Eval BODY allowing nonlocal exits using `throw'.
1163 TAG is evalled to get the tag to use; it must not be nil.
1165 Then the BODY is executed.
1166 Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.
1167 If no throw happens, `catch' returns the value of the last BODY form.
1168 If a throw happens, it specifies the value to return from `catch'.
1169 usage: (catch TAG BODY...) */)
1173 register Lisp_Object tag
;
1174 struct gcpro gcpro1
;
1177 tag
= Feval (Fcar (args
));
1179 return internal_catch (tag
, Fprogn
, Fcdr (args
));
1182 /* Set up a catch, then call C function FUNC on argument ARG.
1183 FUNC should return a Lisp_Object.
1184 This is how catches are done from within C code. */
1187 internal_catch (tag
, func
, arg
)
1189 Lisp_Object (*func
) ();
1192 /* This structure is made part of the chain `catchlist'. */
1195 /* Fill in the components of c, and put it on the list. */
1199 c
.backlist
= backtrace_list
;
1200 c
.handlerlist
= handlerlist
;
1201 c
.lisp_eval_depth
= lisp_eval_depth
;
1202 c
.pdlcount
= SPECPDL_INDEX ();
1203 c
.poll_suppress_count
= poll_suppress_count
;
1204 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1205 c
.gcpro
= gcprolist
;
1206 c
.byte_stack
= byte_stack_list
;
1210 if (! _setjmp (c
.jmp
))
1211 c
.val
= (*func
) (arg
);
1213 /* Throw works by a longjmp that comes right here. */
1218 /* Unwind the specbind, catch, and handler stacks back to CATCH, and
1219 jump to that CATCH, returning VALUE as the value of that catch.
1221 This is the guts Fthrow and Fsignal; they differ only in the way
1222 they choose the catch tag to throw to. A catch tag for a
1223 condition-case form has a TAG of Qnil.
1225 Before each catch is discarded, unbind all special bindings and
1226 execute all unwind-protect clauses made above that catch. Unwind
1227 the handler stack as we go, so that the proper handlers are in
1228 effect for each unwind-protect clause we run. At the end, restore
1229 some static info saved in CATCH, and longjmp to the location
1232 This is used for correct unwinding in Fthrow and Fsignal. */
1235 unwind_to_catch (catch, value
)
1236 struct catchtag
*catch;
1239 register int last_time
;
1241 /* Save the value in the tag. */
1244 /* Restore certain special C variables. */
1245 set_poll_suppress_count (catch->poll_suppress_count
);
1246 UNBLOCK_INPUT_TO (catch->interrupt_input_blocked
);
1247 handling_signal
= 0;
1252 last_time
= catchlist
== catch;
1254 /* Unwind the specpdl stack, and then restore the proper set of
1256 unbind_to (catchlist
->pdlcount
, Qnil
);
1257 handlerlist
= catchlist
->handlerlist
;
1258 catchlist
= catchlist
->next
;
1260 while (! last_time
);
1262 byte_stack_list
= catch->byte_stack
;
1263 gcprolist
= catch->gcpro
;
1266 gcpro_level
= gcprolist
->level
+ 1;
1270 backtrace_list
= catch->backlist
;
1271 lisp_eval_depth
= catch->lisp_eval_depth
;
1273 _longjmp (catch->jmp
, 1);
1276 DEFUN ("throw", Fthrow
, Sthrow
, 2, 2, 0,
1277 doc
: /* Throw to the catch for TAG and return VALUE from it.
1278 Both TAG and VALUE are evalled. */)
1280 register Lisp_Object tag
, value
;
1282 register struct catchtag
*c
;
1287 for (c
= catchlist
; c
; c
= c
->next
)
1289 if (EQ (c
->tag
, tag
))
1290 unwind_to_catch (c
, value
);
1292 tag
= Fsignal (Qno_catch
, Fcons (tag
, Fcons (value
, Qnil
)));
1297 DEFUN ("unwind-protect", Funwind_protect
, Sunwind_protect
, 1, UNEVALLED
, 0,
1298 doc
: /* Do BODYFORM, protecting with UNWINDFORMS.
1299 If BODYFORM completes normally, its value is returned
1300 after executing the UNWINDFORMS.
1301 If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.
1302 usage: (unwind-protect BODYFORM UNWINDFORMS...) */)
1307 int count
= SPECPDL_INDEX ();
1309 record_unwind_protect (Fprogn
, Fcdr (args
));
1310 val
= Feval (Fcar (args
));
1311 return unbind_to (count
, val
);
1314 /* Chain of condition handlers currently in effect.
1315 The elements of this chain are contained in the stack frames
1316 of Fcondition_case and internal_condition_case.
1317 When an error is signaled (by calling Fsignal, below),
1318 this chain is searched for an element that applies. */
1320 struct handler
*handlerlist
;
1322 DEFUN ("condition-case", Fcondition_case
, Scondition_case
, 2, UNEVALLED
, 0,
1323 doc
: /* Regain control when an error is signaled.
1324 Executes BODYFORM and returns its value if no error happens.
1325 Each element of HANDLERS looks like (CONDITION-NAME BODY...)
1326 where the BODY is made of Lisp expressions.
1328 A handler is applicable to an error
1329 if CONDITION-NAME is one of the error's condition names.
1330 If an error happens, the first applicable handler is run.
1332 The car of a handler may be a list of condition names
1333 instead of a single condition name.
1335 When a handler handles an error,
1336 control returns to the condition-case and the handler BODY... is executed
1337 with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).
1338 VAR may be nil; then you do not get access to the signal information.
1340 The value of the last BODY form is returned from the condition-case.
1341 See also the function `signal' for more info.
1342 usage: (condition-case VAR BODYFORM &rest HANDLERS) */)
1349 register Lisp_Object bodyform
, handlers
;
1350 volatile Lisp_Object var
;
1353 bodyform
= Fcar (Fcdr (args
));
1354 handlers
= Fcdr (Fcdr (args
));
1357 for (val
= handlers
; CONSP (val
); val
= XCDR (val
))
1363 && (SYMBOLP (XCAR (tem
))
1364 || CONSP (XCAR (tem
))))))
1365 error ("Invalid condition handler", tem
);
1370 c
.backlist
= backtrace_list
;
1371 c
.handlerlist
= handlerlist
;
1372 c
.lisp_eval_depth
= lisp_eval_depth
;
1373 c
.pdlcount
= SPECPDL_INDEX ();
1374 c
.poll_suppress_count
= poll_suppress_count
;
1375 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1376 c
.gcpro
= gcprolist
;
1377 c
.byte_stack
= byte_stack_list
;
1378 if (_setjmp (c
.jmp
))
1381 specbind (h
.var
, c
.val
);
1382 val
= Fprogn (Fcdr (h
.chosen_clause
));
1384 /* Note that this just undoes the binding of h.var; whoever
1385 longjumped to us unwound the stack to c.pdlcount before
1387 unbind_to (c
.pdlcount
, Qnil
);
1394 h
.handler
= handlers
;
1395 h
.next
= handlerlist
;
1399 val
= Feval (bodyform
);
1401 handlerlist
= h
.next
;
1405 /* Call the function BFUN with no arguments, catching errors within it
1406 according to HANDLERS. If there is an error, call HFUN with
1407 one argument which is the data that describes the error:
1410 HANDLERS can be a list of conditions to catch.
1411 If HANDLERS is Qt, catch all errors.
1412 If HANDLERS is Qerror, catch all errors
1413 but allow the debugger to run if that is enabled. */
1416 internal_condition_case (bfun
, handlers
, hfun
)
1417 Lisp_Object (*bfun
) ();
1418 Lisp_Object handlers
;
1419 Lisp_Object (*hfun
) ();
1425 #if 0 /* We now handle interrupt_input_blocked properly.
1426 What we still do not handle is exiting a signal handler. */
1432 c
.backlist
= backtrace_list
;
1433 c
.handlerlist
= handlerlist
;
1434 c
.lisp_eval_depth
= lisp_eval_depth
;
1435 c
.pdlcount
= SPECPDL_INDEX ();
1436 c
.poll_suppress_count
= poll_suppress_count
;
1437 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1438 c
.gcpro
= gcprolist
;
1439 c
.byte_stack
= byte_stack_list
;
1440 if (_setjmp (c
.jmp
))
1442 return (*hfun
) (c
.val
);
1446 h
.handler
= handlers
;
1448 h
.next
= handlerlist
;
1454 handlerlist
= h
.next
;
1458 /* Like internal_condition_case but call BFUN with ARG as its argument. */
1461 internal_condition_case_1 (bfun
, arg
, handlers
, hfun
)
1462 Lisp_Object (*bfun
) ();
1464 Lisp_Object handlers
;
1465 Lisp_Object (*hfun
) ();
1473 c
.backlist
= backtrace_list
;
1474 c
.handlerlist
= handlerlist
;
1475 c
.lisp_eval_depth
= lisp_eval_depth
;
1476 c
.pdlcount
= SPECPDL_INDEX ();
1477 c
.poll_suppress_count
= poll_suppress_count
;
1478 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1479 c
.gcpro
= gcprolist
;
1480 c
.byte_stack
= byte_stack_list
;
1481 if (_setjmp (c
.jmp
))
1483 return (*hfun
) (c
.val
);
1487 h
.handler
= handlers
;
1489 h
.next
= handlerlist
;
1493 val
= (*bfun
) (arg
);
1495 handlerlist
= h
.next
;
1500 /* Like internal_condition_case but call BFUN with NARGS as first,
1501 and ARGS as second argument. */
1504 internal_condition_case_2 (bfun
, nargs
, args
, handlers
, hfun
)
1505 Lisp_Object (*bfun
) ();
1508 Lisp_Object handlers
;
1509 Lisp_Object (*hfun
) ();
1517 c
.backlist
= backtrace_list
;
1518 c
.handlerlist
= handlerlist
;
1519 c
.lisp_eval_depth
= lisp_eval_depth
;
1520 c
.pdlcount
= SPECPDL_INDEX ();
1521 c
.poll_suppress_count
= poll_suppress_count
;
1522 c
.interrupt_input_blocked
= interrupt_input_blocked
;
1523 c
.gcpro
= gcprolist
;
1524 c
.byte_stack
= byte_stack_list
;
1525 if (_setjmp (c
.jmp
))
1527 return (*hfun
) (c
.val
);
1531 h
.handler
= handlers
;
1533 h
.next
= handlerlist
;
1537 val
= (*bfun
) (nargs
, args
);
1539 handlerlist
= h
.next
;
1544 static Lisp_Object find_handler_clause
P_ ((Lisp_Object
, Lisp_Object
,
1545 Lisp_Object
, Lisp_Object
,
1548 DEFUN ("signal", Fsignal
, Ssignal
, 2, 2, 0,
1549 doc
: /* Signal an error. Args are ERROR-SYMBOL and associated DATA.
1550 This function does not return.
1552 An error symbol is a symbol with an `error-conditions' property
1553 that is a list of condition names.
1554 A handler for any of those names will get to handle this signal.
1555 The symbol `error' should normally be one of them.
1557 DATA should be a list. Its elements are printed as part of the error message.
1558 See Info anchor `(elisp)Definition of signal' for some details on how this
1559 error message is constructed.
1560 If the signal is handled, DATA is made available to the handler.
1561 See also the function `condition-case'. */)
1562 (error_symbol
, data
)
1563 Lisp_Object error_symbol
, data
;
1565 /* When memory is full, ERROR-SYMBOL is nil,
1566 and DATA is (REAL-ERROR-SYMBOL . REAL-DATA).
1567 That is a special case--don't do this in other situations. */
1568 register struct handler
*allhandlers
= handlerlist
;
1569 Lisp_Object conditions
;
1570 extern int gc_in_progress
;
1571 extern int waiting_for_input
;
1572 Lisp_Object debugger_value
;
1574 Lisp_Object real_error_symbol
;
1575 struct backtrace
*bp
;
1577 immediate_quit
= handling_signal
= 0;
1579 if (gc_in_progress
|| waiting_for_input
)
1582 if (NILP (error_symbol
))
1583 real_error_symbol
= Fcar (data
);
1585 real_error_symbol
= error_symbol
;
1587 #if 0 /* rms: I don't know why this was here,
1588 but it is surely wrong for an error that is handled. */
1589 #ifdef HAVE_X_WINDOWS
1590 if (display_hourglass_p
)
1591 cancel_hourglass ();
1595 /* This hook is used by edebug. */
1596 if (! NILP (Vsignal_hook_function
)
1597 && ! NILP (error_symbol
))
1599 /* Edebug takes care of restoring these variables when it exits. */
1600 if (lisp_eval_depth
+ 20 > max_lisp_eval_depth
)
1601 max_lisp_eval_depth
= lisp_eval_depth
+ 20;
1603 if (SPECPDL_INDEX () + 40 > max_specpdl_size
)
1604 max_specpdl_size
= SPECPDL_INDEX () + 40;
1606 call2 (Vsignal_hook_function
, error_symbol
, data
);
1609 conditions
= Fget (real_error_symbol
, Qerror_conditions
);
1611 /* Remember from where signal was called. Skip over the frame for
1612 `signal' itself. If a frame for `error' follows, skip that,
1613 too. Don't do this when ERROR_SYMBOL is nil, because that
1614 is a memory-full error. */
1615 Vsignaling_function
= Qnil
;
1616 if (backtrace_list
&& !NILP (error_symbol
))
1618 bp
= backtrace_list
->next
;
1619 if (bp
&& bp
->function
&& EQ (*bp
->function
, Qerror
))
1621 if (bp
&& bp
->function
)
1622 Vsignaling_function
= *bp
->function
;
1625 for (; handlerlist
; handlerlist
= handlerlist
->next
)
1627 register Lisp_Object clause
;
1629 clause
= find_handler_clause (handlerlist
->handler
, conditions
,
1630 error_symbol
, data
, &debugger_value
);
1632 if (EQ (clause
, Qlambda
))
1634 /* We can't return values to code which signaled an error, but we
1635 can continue code which has signaled a quit. */
1636 if (EQ (real_error_symbol
, Qquit
))
1639 error ("Cannot return from the debugger in an error");
1644 Lisp_Object unwind_data
;
1645 struct handler
*h
= handlerlist
;
1647 handlerlist
= allhandlers
;
1649 if (NILP (error_symbol
))
1652 unwind_data
= Fcons (error_symbol
, data
);
1653 h
->chosen_clause
= clause
;
1654 unwind_to_catch (h
->tag
, unwind_data
);
1658 handlerlist
= allhandlers
;
1659 /* If no handler is present now, try to run the debugger,
1660 and if that fails, throw to top level. */
1661 find_handler_clause (Qerror
, conditions
, error_symbol
, data
, &debugger_value
);
1663 Fthrow (Qtop_level
, Qt
);
1665 if (! NILP (error_symbol
))
1666 data
= Fcons (error_symbol
, data
);
1668 string
= Ferror_message_string (data
);
1669 fatal ("%s", SDATA (string
), 0);
1672 /* Return nonzero iff LIST is a non-nil atom or
1673 a list containing one of CONDITIONS. */
1676 wants_debugger (list
, conditions
)
1677 Lisp_Object list
, conditions
;
1684 while (CONSP (conditions
))
1686 Lisp_Object
this, tail
;
1687 this = XCAR (conditions
);
1688 for (tail
= list
; CONSP (tail
); tail
= XCDR (tail
))
1689 if (EQ (XCAR (tail
), this))
1691 conditions
= XCDR (conditions
);
1696 /* Return 1 if an error with condition-symbols CONDITIONS,
1697 and described by SIGNAL-DATA, should skip the debugger
1698 according to debugger-ignored-errors. */
1701 skip_debugger (conditions
, data
)
1702 Lisp_Object conditions
, data
;
1705 int first_string
= 1;
1706 Lisp_Object error_message
;
1708 error_message
= Qnil
;
1709 for (tail
= Vdebug_ignored_errors
; CONSP (tail
); tail
= XCDR (tail
))
1711 if (STRINGP (XCAR (tail
)))
1715 error_message
= Ferror_message_string (data
);
1719 if (fast_string_match (XCAR (tail
), error_message
) >= 0)
1724 Lisp_Object contail
;
1726 for (contail
= conditions
; CONSP (contail
); contail
= XCDR (contail
))
1727 if (EQ (XCAR (tail
), XCAR (contail
)))
1735 /* Value of Qlambda means we have called debugger and user has continued.
1736 There are two ways to pass SIG and DATA:
1737 = SIG is the error symbol, and DATA is the rest of the data.
1738 = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
1739 This is for memory-full errors only.
1741 Store value returned from debugger into *DEBUGGER_VALUE_PTR.
1743 We need to increase max_specpdl_size temporarily around
1744 anything we do that can push on the specpdl, so as not to get
1745 a second error here in case we're handling specpdl overflow. */
1748 find_handler_clause (handlers
, conditions
, sig
, data
, debugger_value_ptr
)
1749 Lisp_Object handlers
, conditions
, sig
, data
;
1750 Lisp_Object
*debugger_value_ptr
;
1752 register Lisp_Object h
;
1753 register Lisp_Object tem
;
1755 if (EQ (handlers
, Qt
)) /* t is used by handlers for all conditions, set up by C code. */
1757 /* error is used similarly, but means print an error message
1758 and run the debugger if that is enabled. */
1759 if (EQ (handlers
, Qerror
)
1760 || !NILP (Vdebug_on_signal
)) /* This says call debugger even if
1761 there is a handler. */
1763 int debugger_called
= 0;
1764 Lisp_Object sig_symbol
, combined_data
;
1765 /* This is set to 1 if we are handling a memory-full error,
1766 because these must not run the debugger.
1767 (There is no room in memory to do that!) */
1768 int no_debugger
= 0;
1772 combined_data
= data
;
1773 sig_symbol
= Fcar (data
);
1778 combined_data
= Fcons (sig
, data
);
1782 if (wants_debugger (Vstack_trace_on_error
, conditions
))
1786 internal_with_output_to_temp_buffer ("*Backtrace*",
1787 (Lisp_Object (*) (Lisp_Object
)) Fbacktrace
,
1790 internal_with_output_to_temp_buffer ("*Backtrace*",
1796 && (EQ (sig_symbol
, Qquit
)
1798 : wants_debugger (Vdebug_on_error
, conditions
))
1799 && ! skip_debugger (conditions
, combined_data
)
1800 && when_entered_debugger
< num_nonmacro_input_events
)
1803 = call_debugger (Fcons (Qerror
,
1804 Fcons (combined_data
, Qnil
)));
1805 debugger_called
= 1;
1807 /* If there is no handler, return saying whether we ran the debugger. */
1808 if (EQ (handlers
, Qerror
))
1810 if (debugger_called
)
1815 for (h
= handlers
; CONSP (h
); h
= Fcdr (h
))
1817 Lisp_Object handler
, condit
;
1820 if (!CONSP (handler
))
1822 condit
= Fcar (handler
);
1823 /* Handle a single condition name in handler HANDLER. */
1824 if (SYMBOLP (condit
))
1826 tem
= Fmemq (Fcar (handler
), conditions
);
1830 /* Handle a list of condition names in handler HANDLER. */
1831 else if (CONSP (condit
))
1833 while (CONSP (condit
))
1835 tem
= Fmemq (Fcar (condit
), conditions
);
1838 condit
= XCDR (condit
);
1845 /* dump an error message; called like printf */
1849 error (m
, a1
, a2
, a3
)
1869 int used
= doprnt (buffer
, size
, m
, m
+ mlen
, 3, args
);
1874 buffer
= (char *) xrealloc (buffer
, size
);
1877 buffer
= (char *) xmalloc (size
);
1882 string
= build_string (buffer
);
1886 Fsignal (Qerror
, Fcons (string
, Qnil
));
1890 DEFUN ("commandp", Fcommandp
, Scommandp
, 1, 2, 0,
1891 doc
: /* Non-nil if FUNCTION makes provisions for interactive calling.
1892 This means it contains a description for how to read arguments to give it.
1893 The value is nil for an invalid function or a symbol with no function
1896 Interactively callable functions include strings and vectors (treated
1897 as keyboard macros), lambda-expressions that contain a top-level call
1898 to `interactive', autoload definitions made by `autoload' with non-nil
1899 fourth argument, and some of the built-in functions of Lisp.
1901 Also, a symbol satisfies `commandp' if its function definition does so.
1903 If the optional argument FOR-CALL-INTERACTIVELY is non-nil,
1904 then strings and vectors are not accepted. */)
1905 (function
, for_call_interactively
)
1906 Lisp_Object function
, for_call_interactively
;
1908 register Lisp_Object fun
;
1909 register Lisp_Object funcar
;
1913 fun
= indirect_function (fun
);
1914 if (EQ (fun
, Qunbound
))
1917 /* Emacs primitives are interactive if their DEFUN specifies an
1918 interactive spec. */
1921 if (XSUBR (fun
)->prompt
)
1927 /* Bytecode objects are interactive if they are long enough to
1928 have an element whose index is COMPILED_INTERACTIVE, which is
1929 where the interactive spec is stored. */
1930 else if (COMPILEDP (fun
))
1931 return ((ASIZE (fun
) & PSEUDOVECTOR_SIZE_MASK
) > COMPILED_INTERACTIVE
1934 /* Strings and vectors are keyboard macros. */
1935 if (NILP (for_call_interactively
) && (STRINGP (fun
) || VECTORP (fun
)))
1938 /* Lists may represent commands. */
1941 funcar
= XCAR (fun
);
1942 if (EQ (funcar
, Qlambda
))
1943 return Fassq (Qinteractive
, Fcdr (XCDR (fun
)));
1944 if (EQ (funcar
, Qautoload
))
1945 return Fcar (Fcdr (Fcdr (XCDR (fun
))));
1951 DEFUN ("autoload", Fautoload
, Sautoload
, 2, 5, 0,
1952 doc
: /* Define FUNCTION to autoload from FILE.
1953 FUNCTION is a symbol; FILE is a file name string to pass to `load'.
1954 Third arg DOCSTRING is documentation for the function.
1955 Fourth arg INTERACTIVE if non-nil says function can be called interactively.
1956 Fifth arg TYPE indicates the type of the object:
1957 nil or omitted says FUNCTION is a function,
1958 `keymap' says FUNCTION is really a keymap, and
1959 `macro' or t says FUNCTION is really a macro.
1960 Third through fifth args give info about the real definition.
1961 They default to nil.
1962 If FUNCTION is already defined other than as an autoload,
1963 this does nothing and returns nil. */)
1964 (function
, file
, docstring
, interactive
, type
)
1965 Lisp_Object function
, file
, docstring
, interactive
, type
;
1968 Lisp_Object args
[4];
1971 CHECK_SYMBOL (function
);
1972 CHECK_STRING (file
);
1974 /* If function is defined and not as an autoload, don't override */
1975 if (!EQ (XSYMBOL (function
)->function
, Qunbound
)
1976 && !(CONSP (XSYMBOL (function
)->function
)
1977 && EQ (XCAR (XSYMBOL (function
)->function
), Qautoload
)))
1980 if (NILP (Vpurify_flag
))
1981 /* Only add entries after dumping, because the ones before are
1982 not useful and else we get loads of them from the loaddefs.el. */
1983 LOADHIST_ATTACH (Fcons (Qautoload
, function
));
1987 args
[1] = docstring
;
1988 args
[2] = interactive
;
1991 return Ffset (function
, Fcons (Qautoload
, Flist (4, &args
[0])));
1992 #else /* NO_ARG_ARRAY */
1993 return Ffset (function
, Fcons (Qautoload
, Flist (4, &file
)));
1994 #endif /* not NO_ARG_ARRAY */
1998 un_autoload (oldqueue
)
1999 Lisp_Object oldqueue
;
2001 register Lisp_Object queue
, first
, second
;
2003 /* Queue to unwind is current value of Vautoload_queue.
2004 oldqueue is the shadowed value to leave in Vautoload_queue. */
2005 queue
= Vautoload_queue
;
2006 Vautoload_queue
= oldqueue
;
2007 while (CONSP (queue
))
2009 first
= XCAR (queue
);
2010 second
= Fcdr (first
);
2011 first
= Fcar (first
);
2012 if (EQ (second
, Qnil
))
2015 Ffset (first
, second
);
2016 queue
= XCDR (queue
);
2021 /* Load an autoloaded function.
2022 FUNNAME is the symbol which is the function's name.
2023 FUNDEF is the autoload definition (a list). */
2026 do_autoload (fundef
, funname
)
2027 Lisp_Object fundef
, funname
;
2029 int count
= SPECPDL_INDEX ();
2030 Lisp_Object fun
, queue
, first
, second
;
2031 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2033 /* This is to make sure that loadup.el gives a clear picture
2034 of what files are preloaded and when. */
2035 if (! NILP (Vpurify_flag
))
2036 error ("Attempt to autoload %s while preparing to dump",
2037 SDATA (SYMBOL_NAME (funname
)));
2040 CHECK_SYMBOL (funname
);
2041 GCPRO3 (fun
, funname
, fundef
);
2043 /* Preserve the match data. */
2044 record_unwind_save_match_data ();
2046 /* Value saved here is to be restored into Vautoload_queue. */
2047 record_unwind_protect (un_autoload
, Vautoload_queue
);
2048 Vautoload_queue
= Qt
;
2049 Fload (Fcar (Fcdr (fundef
)), Qnil
, noninteractive
? Qt
: Qnil
, Qnil
, Qt
);
2051 /* Save the old autoloads, in case we ever do an unload. */
2052 queue
= Vautoload_queue
;
2053 while (CONSP (queue
))
2055 first
= XCAR (queue
);
2056 second
= Fcdr (first
);
2057 first
= Fcar (first
);
2059 if (CONSP (second
) && EQ (XCAR (second
), Qautoload
))
2060 Fput (first
, Qautoload
, (XCDR (second
)));
2062 queue
= XCDR (queue
);
2065 /* Once loading finishes, don't undo it. */
2066 Vautoload_queue
= Qt
;
2067 unbind_to (count
, Qnil
);
2069 fun
= Findirect_function (fun
);
2071 if (!NILP (Fequal (fun
, fundef
)))
2072 error ("Autoloading failed to define function %s",
2073 SDATA (SYMBOL_NAME (funname
)));
2078 DEFUN ("eval", Feval
, Seval
, 1, 1, 0,
2079 doc
: /* Evaluate FORM and return its value. */)
2083 Lisp_Object fun
, val
, original_fun
, original_args
;
2085 struct backtrace backtrace
;
2086 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2088 if (handling_signal
)
2092 return Fsymbol_value (form
);
2097 if (consing_since_gc
> gc_cons_threshold
2098 && consing_since_gc
> gc_relative_threshold
)
2101 Fgarbage_collect ();
2105 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2107 if (max_lisp_eval_depth
< 100)
2108 max_lisp_eval_depth
= 100;
2109 if (lisp_eval_depth
> max_lisp_eval_depth
)
2110 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2113 original_fun
= Fcar (form
);
2114 original_args
= Fcdr (form
);
2116 backtrace
.next
= backtrace_list
;
2117 backtrace_list
= &backtrace
;
2118 backtrace
.function
= &original_fun
; /* This also protects them from gc */
2119 backtrace
.args
= &original_args
;
2120 backtrace
.nargs
= UNEVALLED
;
2121 backtrace
.evalargs
= 1;
2122 backtrace
.debug_on_exit
= 0;
2124 if (debug_on_next_call
)
2125 do_debug_on_call (Qt
);
2127 /* At this point, only original_fun and original_args
2128 have values that will be used below */
2130 fun
= Findirect_function (original_fun
);
2134 Lisp_Object numargs
;
2135 Lisp_Object argvals
[8];
2136 Lisp_Object args_left
;
2137 register int i
, maxargs
;
2139 args_left
= original_args
;
2140 numargs
= Flength (args_left
);
2144 if (XINT (numargs
) < XSUBR (fun
)->min_args
||
2145 (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< XINT (numargs
)))
2146 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (numargs
, Qnil
)));
2148 if (XSUBR (fun
)->max_args
== UNEVALLED
)
2150 backtrace
.evalargs
= 0;
2151 val
= (*XSUBR (fun
)->function
) (args_left
);
2155 if (XSUBR (fun
)->max_args
== MANY
)
2157 /* Pass a vector of evaluated arguments */
2159 register int argnum
= 0;
2161 vals
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
2163 GCPRO3 (args_left
, fun
, fun
);
2167 while (!NILP (args_left
))
2169 vals
[argnum
++] = Feval (Fcar (args_left
));
2170 args_left
= Fcdr (args_left
);
2171 gcpro3
.nvars
= argnum
;
2174 backtrace
.args
= vals
;
2175 backtrace
.nargs
= XINT (numargs
);
2177 val
= (*XSUBR (fun
)->function
) (XINT (numargs
), vals
);
2182 GCPRO3 (args_left
, fun
, fun
);
2183 gcpro3
.var
= argvals
;
2186 maxargs
= XSUBR (fun
)->max_args
;
2187 for (i
= 0; i
< maxargs
; args_left
= Fcdr (args_left
))
2189 argvals
[i
] = Feval (Fcar (args_left
));
2195 backtrace
.args
= argvals
;
2196 backtrace
.nargs
= XINT (numargs
);
2201 val
= (*XSUBR (fun
)->function
) ();
2204 val
= (*XSUBR (fun
)->function
) (argvals
[0]);
2207 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1]);
2210 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
2214 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
2215 argvals
[2], argvals
[3]);
2218 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2219 argvals
[3], argvals
[4]);
2222 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2223 argvals
[3], argvals
[4], argvals
[5]);
2226 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2227 argvals
[3], argvals
[4], argvals
[5],
2232 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2233 argvals
[3], argvals
[4], argvals
[5],
2234 argvals
[6], argvals
[7]);
2238 /* Someone has created a subr that takes more arguments than
2239 is supported by this code. We need to either rewrite the
2240 subr to use a different argument protocol, or add more
2241 cases to this switch. */
2245 if (COMPILEDP (fun
))
2246 val
= apply_lambda (fun
, original_args
, 1);
2250 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2251 funcar
= Fcar (fun
);
2252 if (!SYMBOLP (funcar
))
2253 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2254 if (EQ (funcar
, Qautoload
))
2256 do_autoload (fun
, original_fun
);
2259 if (EQ (funcar
, Qmacro
))
2260 val
= Feval (apply1 (Fcdr (fun
), original_args
));
2261 else if (EQ (funcar
, Qlambda
))
2262 val
= apply_lambda (fun
, original_args
, 1);
2264 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2270 if (backtrace
.debug_on_exit
)
2271 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
2272 backtrace_list
= backtrace
.next
;
2277 DEFUN ("apply", Fapply
, Sapply
, 2, MANY
, 0,
2278 doc
: /* Call FUNCTION with our remaining args, using our last arg as list of args.
2279 Then return the value FUNCTION returns.
2280 Thus, (apply '+ 1 2 '(3 4)) returns 10.
2281 usage: (apply FUNCTION &rest ARGUMENTS) */)
2286 register int i
, numargs
;
2287 register Lisp_Object spread_arg
;
2288 register Lisp_Object
*funcall_args
;
2290 struct gcpro gcpro1
;
2294 spread_arg
= args
[nargs
- 1];
2295 CHECK_LIST (spread_arg
);
2297 numargs
= XINT (Flength (spread_arg
));
2300 return Ffuncall (nargs
- 1, args
);
2301 else if (numargs
== 1)
2303 args
[nargs
- 1] = XCAR (spread_arg
);
2304 return Ffuncall (nargs
, args
);
2307 numargs
+= nargs
- 2;
2309 fun
= indirect_function (fun
);
2310 if (EQ (fun
, Qunbound
))
2312 /* Let funcall get the error */
2319 if (numargs
< XSUBR (fun
)->min_args
2320 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2321 goto funcall
; /* Let funcall get the error */
2322 else if (XSUBR (fun
)->max_args
> numargs
)
2324 /* Avoid making funcall cons up a yet another new vector of arguments
2325 by explicitly supplying nil's for optional values */
2326 funcall_args
= (Lisp_Object
*) alloca ((1 + XSUBR (fun
)->max_args
)
2327 * sizeof (Lisp_Object
));
2328 for (i
= numargs
; i
< XSUBR (fun
)->max_args
;)
2329 funcall_args
[++i
] = Qnil
;
2330 GCPRO1 (*funcall_args
);
2331 gcpro1
.nvars
= 1 + XSUBR (fun
)->max_args
;
2335 /* We add 1 to numargs because funcall_args includes the
2336 function itself as well as its arguments. */
2339 funcall_args
= (Lisp_Object
*) alloca ((1 + numargs
)
2340 * sizeof (Lisp_Object
));
2341 GCPRO1 (*funcall_args
);
2342 gcpro1
.nvars
= 1 + numargs
;
2345 bcopy (args
, funcall_args
, nargs
* sizeof (Lisp_Object
));
2346 /* Spread the last arg we got. Its first element goes in
2347 the slot that it used to occupy, hence this value of I. */
2349 while (!NILP (spread_arg
))
2351 funcall_args
[i
++] = XCAR (spread_arg
);
2352 spread_arg
= XCDR (spread_arg
);
2355 /* By convention, the caller needs to gcpro Ffuncall's args. */
2356 RETURN_UNGCPRO (Ffuncall (gcpro1
.nvars
, funcall_args
));
2359 /* Run hook variables in various ways. */
2361 enum run_hooks_condition
{to_completion
, until_success
, until_failure
};
2362 static Lisp_Object run_hook_with_args
P_ ((int, Lisp_Object
*,
2363 enum run_hooks_condition
));
2365 DEFUN ("run-hooks", Frun_hooks
, Srun_hooks
, 0, MANY
, 0,
2366 doc
: /* Run each hook in HOOKS.
2367 Each argument should be a symbol, a hook variable.
2368 These symbols are processed in the order specified.
2369 If a hook symbol has a non-nil value, that value may be a function
2370 or a list of functions to be called to run the hook.
2371 If the value is a function, it is called with no arguments.
2372 If it is a list, the elements are called, in order, with no arguments.
2374 Major modes should not use this function directly to run their mode
2375 hook; they should use `run-mode-hooks' instead.
2377 Do not use `make-local-variable' to make a hook variable buffer-local.
2378 Instead, use `add-hook' and specify t for the LOCAL argument.
2379 usage: (run-hooks &rest HOOKS) */)
2384 Lisp_Object hook
[1];
2387 for (i
= 0; i
< nargs
; i
++)
2390 run_hook_with_args (1, hook
, to_completion
);
2396 DEFUN ("run-hook-with-args", Frun_hook_with_args
,
2397 Srun_hook_with_args
, 1, MANY
, 0,
2398 doc
: /* Run HOOK with the specified arguments ARGS.
2399 HOOK should be a symbol, a hook variable. If HOOK has a non-nil
2400 value, that value may be a function or a list of functions to be
2401 called to run the hook. If the value is a function, it is called with
2402 the given arguments and its return value is returned. If it is a list
2403 of functions, those functions are called, in order,
2404 with the given arguments ARGS.
2405 It is best not to depend on the value returned by `run-hook-with-args',
2408 Do not use `make-local-variable' to make a hook variable buffer-local.
2409 Instead, use `add-hook' and specify t for the LOCAL argument.
2410 usage: (run-hook-with-args HOOK &rest ARGS) */)
2415 return run_hook_with_args (nargs
, args
, to_completion
);
2418 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success
,
2419 Srun_hook_with_args_until_success
, 1, MANY
, 0,
2420 doc
: /* Run HOOK with the specified arguments ARGS.
2421 HOOK should be a symbol, a hook variable. If HOOK has a non-nil
2422 value, that value may be a function or a list of functions to be
2423 called to run the hook. If the value is a function, it is called with
2424 the given arguments and its return value is returned.
2425 If it is a list of functions, those functions are called, in order,
2426 with the given arguments ARGS, until one of them
2427 returns a non-nil value. Then we return that value.
2428 However, if they all return nil, we return nil.
2430 Do not use `make-local-variable' to make a hook variable buffer-local.
2431 Instead, use `add-hook' and specify t for the LOCAL argument.
2432 usage: (run-hook-with-args-until-success HOOK &rest ARGS) */)
2437 return run_hook_with_args (nargs
, args
, until_success
);
2440 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure
,
2441 Srun_hook_with_args_until_failure
, 1, MANY
, 0,
2442 doc
: /* Run HOOK with the specified arguments ARGS.
2443 HOOK should be a symbol, a hook variable. If HOOK has a non-nil
2444 value, that value may be a function or a list of functions to be
2445 called to run the hook. If the value is a function, it is called with
2446 the given arguments and its return value is returned.
2447 If it is a list of functions, those functions are called, in order,
2448 with the given arguments ARGS, until one of them returns nil.
2449 Then we return nil. However, if they all return non-nil, we return non-nil.
2451 Do not use `make-local-variable' to make a hook variable buffer-local.
2452 Instead, use `add-hook' and specify t for the LOCAL argument.
2453 usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */)
2458 return run_hook_with_args (nargs
, args
, until_failure
);
2461 /* ARGS[0] should be a hook symbol.
2462 Call each of the functions in the hook value, passing each of them
2463 as arguments all the rest of ARGS (all NARGS - 1 elements).
2464 COND specifies a condition to test after each call
2465 to decide whether to stop.
2466 The caller (or its caller, etc) must gcpro all of ARGS,
2467 except that it isn't necessary to gcpro ARGS[0]. */
2470 run_hook_with_args (nargs
, args
, cond
)
2473 enum run_hooks_condition cond
;
2475 Lisp_Object sym
, val
, ret
;
2476 Lisp_Object globals
;
2477 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2479 /* If we are dying or still initializing,
2480 don't do anything--it would probably crash if we tried. */
2481 if (NILP (Vrun_hooks
))
2485 val
= find_symbol_value (sym
);
2486 ret
= (cond
== until_failure
? Qt
: Qnil
);
2488 if (EQ (val
, Qunbound
) || NILP (val
))
2490 else if (!CONSP (val
) || EQ (XCAR (val
), Qlambda
))
2493 return Ffuncall (nargs
, args
);
2498 GCPRO3 (sym
, val
, globals
);
2501 CONSP (val
) && ((cond
== to_completion
)
2502 || (cond
== until_success
? NILP (ret
)
2506 if (EQ (XCAR (val
), Qt
))
2508 /* t indicates this hook has a local binding;
2509 it means to run the global binding too. */
2511 for (globals
= Fdefault_value (sym
);
2512 CONSP (globals
) && ((cond
== to_completion
)
2513 || (cond
== until_success
? NILP (ret
)
2515 globals
= XCDR (globals
))
2517 args
[0] = XCAR (globals
);
2518 /* In a global value, t should not occur. If it does, we
2519 must ignore it to avoid an endless loop. */
2520 if (!EQ (args
[0], Qt
))
2521 ret
= Ffuncall (nargs
, args
);
2526 args
[0] = XCAR (val
);
2527 ret
= Ffuncall (nargs
, args
);
2536 /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual
2537 present value of that symbol.
2538 Call each element of FUNLIST,
2539 passing each of them the rest of ARGS.
2540 The caller (or its caller, etc) must gcpro all of ARGS,
2541 except that it isn't necessary to gcpro ARGS[0]. */
2544 run_hook_list_with_args (funlist
, nargs
, args
)
2545 Lisp_Object funlist
;
2551 Lisp_Object globals
;
2552 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2556 GCPRO3 (sym
, val
, globals
);
2558 for (val
= funlist
; CONSP (val
); val
= XCDR (val
))
2560 if (EQ (XCAR (val
), Qt
))
2562 /* t indicates this hook has a local binding;
2563 it means to run the global binding too. */
2565 for (globals
= Fdefault_value (sym
);
2567 globals
= XCDR (globals
))
2569 args
[0] = XCAR (globals
);
2570 /* In a global value, t should not occur. If it does, we
2571 must ignore it to avoid an endless loop. */
2572 if (!EQ (args
[0], Qt
))
2573 Ffuncall (nargs
, args
);
2578 args
[0] = XCAR (val
);
2579 Ffuncall (nargs
, args
);
2586 /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
2589 run_hook_with_args_2 (hook
, arg1
, arg2
)
2590 Lisp_Object hook
, arg1
, arg2
;
2592 Lisp_Object temp
[3];
2597 Frun_hook_with_args (3, temp
);
2600 /* Apply fn to arg */
2603 Lisp_Object fn
, arg
;
2605 struct gcpro gcpro1
;
2609 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2613 Lisp_Object args
[2];
2617 RETURN_UNGCPRO (Fapply (2, args
));
2619 #else /* not NO_ARG_ARRAY */
2620 RETURN_UNGCPRO (Fapply (2, &fn
));
2621 #endif /* not NO_ARG_ARRAY */
2624 /* Call function fn on no arguments */
2629 struct gcpro gcpro1
;
2632 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2635 /* Call function fn with 1 argument arg1 */
2639 Lisp_Object fn
, arg1
;
2641 struct gcpro gcpro1
;
2643 Lisp_Object args
[2];
2649 RETURN_UNGCPRO (Ffuncall (2, args
));
2650 #else /* not NO_ARG_ARRAY */
2653 RETURN_UNGCPRO (Ffuncall (2, &fn
));
2654 #endif /* not NO_ARG_ARRAY */
2657 /* Call function fn with 2 arguments arg1, arg2 */
2660 call2 (fn
, arg1
, arg2
)
2661 Lisp_Object fn
, arg1
, arg2
;
2663 struct gcpro gcpro1
;
2665 Lisp_Object args
[3];
2671 RETURN_UNGCPRO (Ffuncall (3, args
));
2672 #else /* not NO_ARG_ARRAY */
2675 RETURN_UNGCPRO (Ffuncall (3, &fn
));
2676 #endif /* not NO_ARG_ARRAY */
2679 /* Call function fn with 3 arguments arg1, arg2, arg3 */
2682 call3 (fn
, arg1
, arg2
, arg3
)
2683 Lisp_Object fn
, arg1
, arg2
, arg3
;
2685 struct gcpro gcpro1
;
2687 Lisp_Object args
[4];
2694 RETURN_UNGCPRO (Ffuncall (4, args
));
2695 #else /* not NO_ARG_ARRAY */
2698 RETURN_UNGCPRO (Ffuncall (4, &fn
));
2699 #endif /* not NO_ARG_ARRAY */
2702 /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */
2705 call4 (fn
, arg1
, arg2
, arg3
, arg4
)
2706 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
;
2708 struct gcpro gcpro1
;
2710 Lisp_Object args
[5];
2718 RETURN_UNGCPRO (Ffuncall (5, args
));
2719 #else /* not NO_ARG_ARRAY */
2722 RETURN_UNGCPRO (Ffuncall (5, &fn
));
2723 #endif /* not NO_ARG_ARRAY */
2726 /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */
2729 call5 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
)
2730 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
;
2732 struct gcpro gcpro1
;
2734 Lisp_Object args
[6];
2743 RETURN_UNGCPRO (Ffuncall (6, args
));
2744 #else /* not NO_ARG_ARRAY */
2747 RETURN_UNGCPRO (Ffuncall (6, &fn
));
2748 #endif /* not NO_ARG_ARRAY */
2751 /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */
2754 call6 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
)
2755 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
;
2757 struct gcpro gcpro1
;
2759 Lisp_Object args
[7];
2769 RETURN_UNGCPRO (Ffuncall (7, args
));
2770 #else /* not NO_ARG_ARRAY */
2773 RETURN_UNGCPRO (Ffuncall (7, &fn
));
2774 #endif /* not NO_ARG_ARRAY */
2777 /* The caller should GCPRO all the elements of ARGS. */
2779 DEFUN ("funcall", Ffuncall
, Sfuncall
, 1, MANY
, 0,
2780 doc
: /* Call first argument as a function, passing remaining arguments to it.
2781 Return the value that function returns.
2782 Thus, (funcall 'cons 'x 'y) returns (x . y).
2783 usage: (funcall FUNCTION &rest ARGUMENTS) */)
2790 int numargs
= nargs
- 1;
2791 Lisp_Object lisp_numargs
;
2793 struct backtrace backtrace
;
2794 register Lisp_Object
*internal_args
;
2798 if (consing_since_gc
> gc_cons_threshold
2799 && consing_since_gc
> gc_relative_threshold
)
2800 Fgarbage_collect ();
2802 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2804 if (max_lisp_eval_depth
< 100)
2805 max_lisp_eval_depth
= 100;
2806 if (lisp_eval_depth
> max_lisp_eval_depth
)
2807 error ("Lisp nesting exceeds `max-lisp-eval-depth'");
2810 backtrace
.next
= backtrace_list
;
2811 backtrace_list
= &backtrace
;
2812 backtrace
.function
= &args
[0];
2813 backtrace
.args
= &args
[1];
2814 backtrace
.nargs
= nargs
- 1;
2815 backtrace
.evalargs
= 0;
2816 backtrace
.debug_on_exit
= 0;
2818 if (debug_on_next_call
)
2819 do_debug_on_call (Qlambda
);
2827 fun
= Findirect_function (fun
);
2831 if (numargs
< XSUBR (fun
)->min_args
2832 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2834 XSETFASTINT (lisp_numargs
, numargs
);
2835 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (lisp_numargs
, Qnil
)));
2838 if (XSUBR (fun
)->max_args
== UNEVALLED
)
2839 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2841 if (XSUBR (fun
)->max_args
== MANY
)
2843 val
= (*XSUBR (fun
)->function
) (numargs
, args
+ 1);
2847 if (XSUBR (fun
)->max_args
> numargs
)
2849 internal_args
= (Lisp_Object
*) alloca (XSUBR (fun
)->max_args
* sizeof (Lisp_Object
));
2850 bcopy (args
+ 1, internal_args
, numargs
* sizeof (Lisp_Object
));
2851 for (i
= numargs
; i
< XSUBR (fun
)->max_args
; i
++)
2852 internal_args
[i
] = Qnil
;
2855 internal_args
= args
+ 1;
2856 switch (XSUBR (fun
)->max_args
)
2859 val
= (*XSUBR (fun
)->function
) ();
2862 val
= (*XSUBR (fun
)->function
) (internal_args
[0]);
2865 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1]);
2868 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2872 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2873 internal_args
[2], internal_args
[3]);
2876 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2877 internal_args
[2], internal_args
[3],
2881 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2882 internal_args
[2], internal_args
[3],
2883 internal_args
[4], internal_args
[5]);
2886 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2887 internal_args
[2], internal_args
[3],
2888 internal_args
[4], internal_args
[5],
2893 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2894 internal_args
[2], internal_args
[3],
2895 internal_args
[4], internal_args
[5],
2896 internal_args
[6], internal_args
[7]);
2901 /* If a subr takes more than 8 arguments without using MANY
2902 or UNEVALLED, we need to extend this function to support it.
2903 Until this is done, there is no way to call the function. */
2907 if (COMPILEDP (fun
))
2908 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2912 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2913 funcar
= Fcar (fun
);
2914 if (!SYMBOLP (funcar
))
2915 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2916 if (EQ (funcar
, Qlambda
))
2917 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2918 else if (EQ (funcar
, Qautoload
))
2920 do_autoload (fun
, args
[0]);
2925 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2930 if (backtrace
.debug_on_exit
)
2931 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
2932 backtrace_list
= backtrace
.next
;
2937 apply_lambda (fun
, args
, eval_flag
)
2938 Lisp_Object fun
, args
;
2941 Lisp_Object args_left
;
2942 Lisp_Object numargs
;
2943 register Lisp_Object
*arg_vector
;
2944 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2946 register Lisp_Object tem
;
2948 numargs
= Flength (args
);
2949 arg_vector
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
2952 GCPRO3 (*arg_vector
, args_left
, fun
);
2955 for (i
= 0; i
< XINT (numargs
);)
2957 tem
= Fcar (args_left
), args_left
= Fcdr (args_left
);
2958 if (eval_flag
) tem
= Feval (tem
);
2959 arg_vector
[i
++] = tem
;
2967 backtrace_list
->args
= arg_vector
;
2968 backtrace_list
->nargs
= i
;
2970 backtrace_list
->evalargs
= 0;
2971 tem
= funcall_lambda (fun
, XINT (numargs
), arg_vector
);
2973 /* Do the debug-on-exit now, while arg_vector still exists. */
2974 if (backtrace_list
->debug_on_exit
)
2975 tem
= call_debugger (Fcons (Qexit
, Fcons (tem
, Qnil
)));
2976 /* Don't do it again when we return to eval. */
2977 backtrace_list
->debug_on_exit
= 0;
2981 /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
2982 and return the result of evaluation.
2983 FUN must be either a lambda-expression or a compiled-code object. */
2986 funcall_lambda (fun
, nargs
, arg_vector
)
2989 register Lisp_Object
*arg_vector
;
2991 Lisp_Object val
, syms_left
, next
;
2992 int count
= SPECPDL_INDEX ();
2993 int i
, optional
, rest
;
2997 syms_left
= XCDR (fun
);
2998 if (CONSP (syms_left
))
2999 syms_left
= XCAR (syms_left
);
3001 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
3003 else if (COMPILEDP (fun
))
3004 syms_left
= AREF (fun
, COMPILED_ARGLIST
);
3008 i
= optional
= rest
= 0;
3009 for (; CONSP (syms_left
); syms_left
= XCDR (syms_left
))
3013 next
= XCAR (syms_left
);
3014 while (!SYMBOLP (next
))
3015 next
= Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
3017 if (EQ (next
, Qand_rest
))
3019 else if (EQ (next
, Qand_optional
))
3023 specbind (next
, Flist (nargs
- i
, &arg_vector
[i
]));
3027 specbind (next
, arg_vector
[i
++]);
3029 return Fsignal (Qwrong_number_of_arguments
,
3030 Fcons (fun
, Fcons (make_number (nargs
), Qnil
)));
3032 specbind (next
, Qnil
);
3035 if (!NILP (syms_left
))
3036 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
3038 return Fsignal (Qwrong_number_of_arguments
,
3039 Fcons (fun
, Fcons (make_number (nargs
), Qnil
)));
3042 val
= Fprogn (XCDR (XCDR (fun
)));
3045 /* If we have not actually read the bytecode string
3046 and constants vector yet, fetch them from the file. */
3047 if (CONSP (AREF (fun
, COMPILED_BYTECODE
)))
3048 Ffetch_bytecode (fun
);
3049 val
= Fbyte_code (AREF (fun
, COMPILED_BYTECODE
),
3050 AREF (fun
, COMPILED_CONSTANTS
),
3051 AREF (fun
, COMPILED_STACK_DEPTH
));
3054 return unbind_to (count
, val
);
3057 DEFUN ("fetch-bytecode", Ffetch_bytecode
, Sfetch_bytecode
,
3059 doc
: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */)
3065 if (COMPILEDP (object
) && CONSP (AREF (object
, COMPILED_BYTECODE
)))
3067 tem
= read_doc_string (AREF (object
, COMPILED_BYTECODE
));
3070 tem
= AREF (object
, COMPILED_BYTECODE
);
3071 if (CONSP (tem
) && STRINGP (XCAR (tem
)))
3072 error ("Invalid byte code in %s", SDATA (XCAR (tem
)));
3074 error ("Invalid byte code");
3076 AREF (object
, COMPILED_BYTECODE
) = XCAR (tem
);
3077 AREF (object
, COMPILED_CONSTANTS
) = XCDR (tem
);
3085 register int count
= SPECPDL_INDEX ();
3086 if (specpdl_size
>= max_specpdl_size
)
3088 if (max_specpdl_size
< 400)
3089 max_specpdl_size
= 400;
3090 if (specpdl_size
>= max_specpdl_size
)
3092 Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil
));
3095 if (specpdl_size
> max_specpdl_size
)
3096 specpdl_size
= max_specpdl_size
;
3097 specpdl
= (struct specbinding
*) xrealloc (specpdl
, specpdl_size
* sizeof (struct specbinding
));
3098 specpdl_ptr
= specpdl
+ count
;
3102 specbind (symbol
, value
)
3103 Lisp_Object symbol
, value
;
3106 Lisp_Object valcontents
;
3108 CHECK_SYMBOL (symbol
);
3109 if (specpdl_ptr
== specpdl
+ specpdl_size
)
3112 /* The most common case is that of a non-constant symbol with a
3113 trivial value. Make that as fast as we can. */
3114 valcontents
= SYMBOL_VALUE (symbol
);
3115 if (!MISCP (valcontents
) && !SYMBOL_CONSTANT_P (symbol
))
3117 specpdl_ptr
->symbol
= symbol
;
3118 specpdl_ptr
->old_value
= valcontents
;
3119 specpdl_ptr
->func
= NULL
;
3121 SET_SYMBOL_VALUE (symbol
, value
);
3125 Lisp_Object valcontents
;
3127 ovalue
= find_symbol_value (symbol
);
3128 specpdl_ptr
->func
= 0;
3129 specpdl_ptr
->old_value
= ovalue
;
3131 valcontents
= XSYMBOL (symbol
)->value
;
3133 if (BUFFER_LOCAL_VALUEP (valcontents
)
3134 || SOME_BUFFER_LOCAL_VALUEP (valcontents
)
3135 || BUFFER_OBJFWDP (valcontents
))
3137 Lisp_Object where
, current_buffer
;
3139 current_buffer
= Fcurrent_buffer ();
3141 /* For a local variable, record both the symbol and which
3142 buffer's or frame's value we are saving. */
3143 if (!NILP (Flocal_variable_p (symbol
, Qnil
)))
3144 where
= current_buffer
;
3145 else if (!BUFFER_OBJFWDP (valcontents
)
3146 && XBUFFER_LOCAL_VALUE (valcontents
)->found_for_frame
)
3147 where
= XBUFFER_LOCAL_VALUE (valcontents
)->frame
;
3151 /* We're not using the `unused' slot in the specbinding
3152 structure because this would mean we have to do more
3153 work for simple variables. */
3154 specpdl_ptr
->symbol
= Fcons (symbol
, Fcons (where
, current_buffer
));
3156 /* If SYMBOL is a per-buffer variable which doesn't have a
3157 buffer-local value here, make the `let' change the global
3158 value by changing the value of SYMBOL in all buffers not
3159 having their own value. This is consistent with what
3160 happens with other buffer-local variables. */
3162 && BUFFER_OBJFWDP (valcontents
))
3165 Fset_default (symbol
, value
);
3170 specpdl_ptr
->symbol
= symbol
;
3173 if (BUFFER_OBJFWDP (ovalue
) || KBOARD_OBJFWDP (ovalue
))
3174 store_symval_forwarding (symbol
, ovalue
, value
, NULL
);
3176 set_internal (symbol
, value
, 0, 1);
3181 record_unwind_protect (function
, arg
)
3182 Lisp_Object (*function
) P_ ((Lisp_Object
));
3185 if (specpdl_ptr
== specpdl
+ specpdl_size
)
3187 specpdl_ptr
->func
= function
;
3188 specpdl_ptr
->symbol
= Qnil
;
3189 specpdl_ptr
->old_value
= arg
;
3194 unbind_to (count
, value
)
3198 Lisp_Object quitf
= Vquit_flag
;
3199 struct gcpro gcpro1
, gcpro2
;
3201 GCPRO2 (value
, quitf
);
3204 while (specpdl_ptr
!= specpdl
+ count
)
3206 /* Copy the binding, and decrement specpdl_ptr, before we do
3207 the work to unbind it. We decrement first
3208 so that an error in unbinding won't try to unbind
3209 the same entry again, and we copy the binding first
3210 in case more bindings are made during some of the code we run. */
3212 struct specbinding this_binding
;
3213 this_binding
= *--specpdl_ptr
;
3215 if (this_binding
.func
!= 0)
3216 (*this_binding
.func
) (this_binding
.old_value
);
3217 /* If the symbol is a list, it is really (SYMBOL WHERE
3218 . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a
3219 frame. If WHERE is a buffer or frame, this indicates we
3220 bound a variable that had a buffer-local or frame-local
3221 binding. WHERE nil means that the variable had the default
3222 value when it was bound. CURRENT-BUFFER is the buffer that
3223 was current when the variable was bound. */
3224 else if (CONSP (this_binding
.symbol
))
3226 Lisp_Object symbol
, where
;
3228 symbol
= XCAR (this_binding
.symbol
);
3229 where
= XCAR (XCDR (this_binding
.symbol
));
3232 Fset_default (symbol
, this_binding
.old_value
);
3233 else if (BUFFERP (where
))
3234 set_internal (symbol
, this_binding
.old_value
, XBUFFER (where
), 1);
3236 set_internal (symbol
, this_binding
.old_value
, NULL
, 1);
3240 /* If variable has a trivial value (no forwarding), we can
3241 just set it. No need to check for constant symbols here,
3242 since that was already done by specbind. */
3243 if (!MISCP (SYMBOL_VALUE (this_binding
.symbol
)))
3244 SET_SYMBOL_VALUE (this_binding
.symbol
, this_binding
.old_value
);
3246 set_internal (this_binding
.symbol
, this_binding
.old_value
, 0, 1);
3250 if (NILP (Vquit_flag
) && !NILP (quitf
))
3257 DEFUN ("backtrace-debug", Fbacktrace_debug
, Sbacktrace_debug
, 2, 2, 0,
3258 doc
: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.
3259 The debugger is entered when that frame exits, if the flag is non-nil. */)
3261 Lisp_Object level
, flag
;
3263 register struct backtrace
*backlist
= backtrace_list
;
3266 CHECK_NUMBER (level
);
3268 for (i
= 0; backlist
&& i
< XINT (level
); i
++)
3270 backlist
= backlist
->next
;
3274 backlist
->debug_on_exit
= !NILP (flag
);
3279 DEFUN ("backtrace", Fbacktrace
, Sbacktrace
, 0, 0, "",
3280 doc
: /* Print a trace of Lisp function calls currently active.
3281 Output stream used is value of `standard-output'. */)
3284 register struct backtrace
*backlist
= backtrace_list
;
3288 extern Lisp_Object Vprint_level
;
3289 struct gcpro gcpro1
;
3291 XSETFASTINT (Vprint_level
, 3);
3298 write_string (backlist
->debug_on_exit
? "* " : " ", 2);
3299 if (backlist
->nargs
== UNEVALLED
)
3301 Fprin1 (Fcons (*backlist
->function
, *backlist
->args
), Qnil
);
3302 write_string ("\n", -1);
3306 tem
= *backlist
->function
;
3307 Fprin1 (tem
, Qnil
); /* This can QUIT */
3308 write_string ("(", -1);
3309 if (backlist
->nargs
== MANY
)
3311 for (tail
= *backlist
->args
, i
= 0;
3313 tail
= Fcdr (tail
), i
++)
3315 if (i
) write_string (" ", -1);
3316 Fprin1 (Fcar (tail
), Qnil
);
3321 for (i
= 0; i
< backlist
->nargs
; i
++)
3323 if (i
) write_string (" ", -1);
3324 Fprin1 (backlist
->args
[i
], Qnil
);
3327 write_string (")\n", -1);
3329 backlist
= backlist
->next
;
3332 Vprint_level
= Qnil
;
3337 DEFUN ("backtrace-frame", Fbacktrace_frame
, Sbacktrace_frame
, 1, 1, NULL
,
3338 doc
: /* Return the function and arguments NFRAMES up from current execution point.
3339 If that frame has not evaluated the arguments yet (or is a special form),
3340 the value is (nil FUNCTION ARG-FORMS...).
3341 If that frame has evaluated its arguments and called its function already,
3342 the value is (t FUNCTION ARG-VALUES...).
3343 A &rest arg is represented as the tail of the list ARG-VALUES.
3344 FUNCTION is whatever was supplied as car of evaluated list,
3345 or a lambda expression for macro calls.
3346 If NFRAMES is more than the number of frames, the value is nil. */)
3348 Lisp_Object nframes
;
3350 register struct backtrace
*backlist
= backtrace_list
;
3354 CHECK_NATNUM (nframes
);
3356 /* Find the frame requested. */
3357 for (i
= 0; backlist
&& i
< XFASTINT (nframes
); i
++)
3358 backlist
= backlist
->next
;
3362 if (backlist
->nargs
== UNEVALLED
)
3363 return Fcons (Qnil
, Fcons (*backlist
->function
, *backlist
->args
));
3366 if (backlist
->nargs
== MANY
)
3367 tem
= *backlist
->args
;
3369 tem
= Flist (backlist
->nargs
, backlist
->args
);
3371 return Fcons (Qt
, Fcons (*backlist
->function
, tem
));
3379 register struct backtrace
*backlist
;
3382 for (backlist
= backtrace_list
; backlist
; backlist
= backlist
->next
)
3384 mark_object (*backlist
->function
);
3386 if (backlist
->nargs
== UNEVALLED
|| backlist
->nargs
== MANY
)
3389 i
= backlist
->nargs
- 1;
3391 mark_object (backlist
->args
[i
]);
3398 DEFVAR_INT ("max-specpdl-size", &max_specpdl_size
,
3399 doc
: /* *Limit on number of Lisp variable bindings and `unwind-protect's.
3400 If Lisp code tries to increase the total number past this amount,
3401 an error is signaled.
3402 You can safely use a value considerably larger than the default value,
3403 if that proves inconveniently small. However, if you increase it too far,
3404 Emacs could run out of memory trying to make the stack bigger. */);
3406 DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth
,
3407 doc
: /* *Limit on depth in `eval', `apply' and `funcall' before error.
3409 This limit serves to catch infinite recursions for you before they cause
3410 actual stack overflow in C, which would be fatal for Emacs.
3411 You can safely make it considerably larger than its default value,
3412 if that proves inconveniently small. However, if you increase it too far,
3413 Emacs could overflow the real C stack, and crash. */);
3415 DEFVAR_LISP ("quit-flag", &Vquit_flag
,
3416 doc
: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.
3417 If the value is t, that means do an ordinary quit.
3418 If the value equals `throw-on-input', that means quit by throwing
3419 to the tag specified in `throw-on-input'; it's for handling `while-no-input'.
3420 Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit',
3421 but `inhibit-quit' non-nil prevents anything from taking notice of that. */);
3424 DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit
,
3425 doc
: /* Non-nil inhibits C-g quitting from happening immediately.
3426 Note that `quit-flag' will still be set by typing C-g,
3427 so a quit will be signaled as soon as `inhibit-quit' is nil.
3428 To prevent this happening, set `quit-flag' to nil
3429 before making `inhibit-quit' nil. */);
3430 Vinhibit_quit
= Qnil
;
3432 Qinhibit_quit
= intern ("inhibit-quit");
3433 staticpro (&Qinhibit_quit
);
3435 Qautoload
= intern ("autoload");
3436 staticpro (&Qautoload
);
3438 Qdebug_on_error
= intern ("debug-on-error");
3439 staticpro (&Qdebug_on_error
);
3441 Qmacro
= intern ("macro");
3442 staticpro (&Qmacro
);
3444 Qdeclare
= intern ("declare");
3445 staticpro (&Qdeclare
);
3447 /* Note that the process handling also uses Qexit, but we don't want
3448 to staticpro it twice, so we just do it here. */
3449 Qexit
= intern ("exit");
3452 Qinteractive
= intern ("interactive");
3453 staticpro (&Qinteractive
);
3455 Qcommandp
= intern ("commandp");
3456 staticpro (&Qcommandp
);
3458 Qdefun
= intern ("defun");
3459 staticpro (&Qdefun
);
3461 Qand_rest
= intern ("&rest");
3462 staticpro (&Qand_rest
);
3464 Qand_optional
= intern ("&optional");
3465 staticpro (&Qand_optional
);
3467 DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error
,
3468 doc
: /* *Non-nil means errors display a backtrace buffer.
3469 More precisely, this happens for any error that is handled
3470 by the editor command loop.
3471 If the value is a list, an error only means to display a backtrace
3472 if one of its condition symbols appears in the list. */);
3473 Vstack_trace_on_error
= Qnil
;
3475 DEFVAR_LISP ("debug-on-error", &Vdebug_on_error
,
3476 doc
: /* *Non-nil means enter debugger if an error is signaled.
3477 Does not apply to errors handled by `condition-case' or those
3478 matched by `debug-ignored-errors'.
3479 If the value is a list, an error only means to enter the debugger
3480 if one of its condition symbols appears in the list.
3481 When you evaluate an expression interactively, this variable
3482 is temporarily non-nil if `eval-expression-debug-on-error' is non-nil.
3483 See also variable `debug-on-quit'. */);
3484 Vdebug_on_error
= Qnil
;
3486 DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors
,
3487 doc
: /* *List of errors for which the debugger should not be called.
3488 Each element may be a condition-name or a regexp that matches error messages.
3489 If any element applies to a given error, that error skips the debugger
3490 and just returns to top level.
3491 This overrides the variable `debug-on-error'.
3492 It does not apply to errors handled by `condition-case'. */);
3493 Vdebug_ignored_errors
= Qnil
;
3495 DEFVAR_BOOL ("debug-on-quit", &debug_on_quit
,
3496 doc
: /* *Non-nil means enter debugger if quit is signaled (C-g, for example).
3497 Does not apply if quit is handled by a `condition-case'. */);
3500 DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call
,
3501 doc
: /* Non-nil means enter debugger before next `eval', `apply' or `funcall'. */);
3503 DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue
,
3504 doc
: /* Non-nil means debugger may continue execution.
3505 This is nil when the debugger is called under circumstances where it
3506 might not be safe to continue. */);
3507 debugger_may_continue
= 1;
3509 DEFVAR_LISP ("debugger", &Vdebugger
,
3510 doc
: /* Function to call to invoke debugger.
3511 If due to frame exit, args are `exit' and the value being returned;
3512 this function's value will be returned instead of that.
3513 If due to error, args are `error' and a list of the args to `signal'.
3514 If due to `apply' or `funcall' entry, one arg, `lambda'.
3515 If due to `eval' entry, one arg, t. */);
3518 DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function
,
3519 doc
: /* If non-nil, this is a function for `signal' to call.
3520 It receives the same arguments that `signal' was given.
3521 The Edebug package uses this to regain control. */);
3522 Vsignal_hook_function
= Qnil
;
3524 DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal
,
3525 doc
: /* *Non-nil means call the debugger regardless of condition handlers.
3526 Note that `debug-on-error', `debug-on-quit' and friends
3527 still determine whether to handle the particular condition. */);
3528 Vdebug_on_signal
= Qnil
;
3530 DEFVAR_LISP ("macro-declaration-function", &Vmacro_declaration_function
,
3531 doc
: /* Function to process declarations in a macro definition.
3532 The function will be called with two args MACRO and DECL.
3533 MACRO is the name of the macro being defined.
3534 DECL is a list `(declare ...)' containing the declarations.
3535 The value the function returns is not used. */);
3536 Vmacro_declaration_function
= Qnil
;
3538 Vrun_hooks
= intern ("run-hooks");
3539 staticpro (&Vrun_hooks
);
3541 staticpro (&Vautoload_queue
);
3542 Vautoload_queue
= Qnil
;
3543 staticpro (&Vsignaling_function
);
3544 Vsignaling_function
= Qnil
;
3555 defsubr (&Sfunction
);
3557 defsubr (&Sdefmacro
);
3559 defsubr (&Sdefvaralias
);
3560 defsubr (&Sdefconst
);
3561 defsubr (&Suser_variable_p
);
3565 defsubr (&Smacroexpand
);
3568 defsubr (&Sunwind_protect
);
3569 defsubr (&Scondition_case
);
3571 defsubr (&Sinteractive_p
);
3572 defsubr (&Scalled_interactively_p
);
3573 defsubr (&Scommandp
);
3574 defsubr (&Sautoload
);
3577 defsubr (&Sfuncall
);
3578 defsubr (&Srun_hooks
);
3579 defsubr (&Srun_hook_with_args
);
3580 defsubr (&Srun_hook_with_args_until_success
);
3581 defsubr (&Srun_hook_with_args_until_failure
);
3582 defsubr (&Sfetch_bytecode
);
3583 defsubr (&Sbacktrace_debug
);
3584 defsubr (&Sbacktrace
);
3585 defsubr (&Sbacktrace_frame
);
3588 /* arch-tag: 014a07aa-33ab-4a8f-a3d2-ee8a4a9ff7fb
3589 (do not change this comment) */