1 /* Evaluator for GNU Emacs Lisp interpreter.
2 Copyright (C) 1985, 86, 87, 93, 94, 95, 99, 2000, 2001
3 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., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, 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 struct byte_stack
*byte_stack
;
83 struct catchtag
*catchlist
;
86 /* Count levels of GCPRO to detect failure to UNGCPRO. */
90 Lisp_Object Qautoload
, Qmacro
, Qexit
, Qinteractive
, Qcommandp
, Qdefun
;
91 Lisp_Object Qinhibit_quit
, Vinhibit_quit
, Vquit_flag
;
92 Lisp_Object Qmocklisp_arguments
, Vmocklisp_arguments
, Qmocklisp
;
93 Lisp_Object Qand_rest
, Qand_optional
;
94 Lisp_Object Qdebug_on_error
;
96 /* This holds either the symbol `run-hooks' or nil.
97 It is nil at an early stage of startup, and when Emacs
100 Lisp_Object Vrun_hooks
;
102 /* Non-nil means record all fset's and provide's, to be undone
103 if the file being autoloaded is not fully loaded.
104 They are recorded by being consed onto the front of Vautoload_queue:
105 (FUN . ODEF) for a defun, (OFEATURES . nil) for a provide. */
107 Lisp_Object Vautoload_queue
;
109 /* Current number of specbindings allocated in specpdl. */
113 /* Pointer to beginning of specpdl. */
115 struct specbinding
*specpdl
;
117 /* Pointer to first unused element in specpdl. */
119 struct specbinding
*specpdl_ptr
;
121 /* Maximum size allowed for specpdl allocation */
123 int max_specpdl_size
;
125 /* Depth in Lisp evaluations and function calls. */
129 /* Maximum allowed depth in Lisp evaluations and function calls. */
131 int max_lisp_eval_depth
;
133 /* Nonzero means enter debugger before next function call */
135 int debug_on_next_call
;
137 /* Non-zero means debuffer may continue. This is zero when the
138 debugger is called during redisplay, where it might not be safe to
139 continue the interrupted redisplay. */
141 int debugger_may_continue
;
143 /* List of conditions (non-nil atom means all) which cause a backtrace
144 if an error is handled by the command loop's error handler. */
146 Lisp_Object Vstack_trace_on_error
;
148 /* List of conditions (non-nil atom means all) which enter the debugger
149 if an error is handled by the command loop's error handler. */
151 Lisp_Object Vdebug_on_error
;
153 /* List of conditions and regexps specifying error messages which
154 do not enter the debugger even if Vdebug_on_errors says they should. */
156 Lisp_Object Vdebug_ignored_errors
;
158 /* Non-nil means call the debugger even if the error will be handled. */
160 Lisp_Object Vdebug_on_signal
;
162 /* Hook for edebug to use. */
164 Lisp_Object Vsignal_hook_function
;
166 /* Nonzero means enter debugger if a quit signal
167 is handled by the command loop's error handler. */
171 /* The value of num_nonmacro_input_events as of the last time we
172 started to enter the debugger. If we decide to enter the debugger
173 again when this is still equal to num_nonmacro_input_events, then we
174 know that the debugger itself has an error, and we should just
175 signal the error instead of entering an infinite loop of debugger
178 int when_entered_debugger
;
180 Lisp_Object Vdebugger
;
182 /* The function from which the last `signal' was called. Set in
185 Lisp_Object Vsignaling_function
;
187 /* Set to non-zero while processing X events. Checked in Feval to
188 make sure the Lisp interpreter isn't called from a signal handler,
189 which is unsafe because the interpreter isn't reentrant. */
193 void specbind (), record_unwind_protect ();
195 Lisp_Object
run_hook_with_args ();
197 Lisp_Object
funcall_lambda ();
198 extern Lisp_Object
ml_apply (); /* Apply a mocklisp function to unevaluated argument list */
204 specpdl
= (struct specbinding
*) xmalloc (specpdl_size
* sizeof (struct specbinding
));
205 specpdl_ptr
= specpdl
;
206 max_specpdl_size
= 600;
207 max_lisp_eval_depth
= 300;
215 specpdl_ptr
= specpdl
;
220 debug_on_next_call
= 0;
225 /* This is less than the initial value of num_nonmacro_input_events. */
226 when_entered_debugger
= -1;
233 int debug_while_redisplaying
;
234 int count
= specpdl_ptr
- specpdl
;
237 if (lisp_eval_depth
+ 20 > max_lisp_eval_depth
)
238 max_lisp_eval_depth
= lisp_eval_depth
+ 20;
240 if (specpdl_size
+ 40 > max_specpdl_size
)
241 max_specpdl_size
= specpdl_size
+ 40;
243 #ifdef HAVE_X_WINDOWS
244 if (display_busy_cursor_p
)
245 cancel_busy_cursor ();
248 debug_on_next_call
= 0;
249 when_entered_debugger
= num_nonmacro_input_events
;
251 /* Resetting redisplaying_p to 0 makes sure that debug output is
252 displayed if the debugger is invoked during redisplay. */
253 debug_while_redisplaying
= redisplaying_p
;
255 specbind (intern ("debugger-may-continue"),
256 debug_while_redisplaying
? Qnil
: Qt
);
258 val
= apply1 (Vdebugger
, arg
);
260 /* Interrupting redisplay and resuming it later is not safe under
261 all circumstances. So, when the debugger returns, abort the
262 interupted redisplay by going back to the top-level. */
263 if (debug_while_redisplaying
)
266 return unbind_to (count
, val
);
270 do_debug_on_call (code
)
273 debug_on_next_call
= 0;
274 backtrace_list
->debug_on_exit
= 1;
275 call_debugger (Fcons (code
, Qnil
));
278 /* NOTE!!! Every function that can call EVAL must protect its args
279 and temporaries from garbage collection while it needs them.
280 The definition of `For' shows what you have to do. */
282 DEFUN ("or", For
, Sor
, 0, UNEVALLED
, 0,
283 "Eval args until one of them yields non-nil, then return that value.\n\
284 The remaining args are not evalled at all.\n\
285 If all args return nil, return nil.")
289 register Lisp_Object val
;
290 Lisp_Object args_left
;
301 val
= Feval (Fcar (args_left
));
304 args_left
= Fcdr (args_left
);
306 while (!NILP(args_left
));
312 DEFUN ("and", Fand
, Sand
, 0, UNEVALLED
, 0,
313 "Eval args until one of them yields nil, then return nil.\n\
314 The remaining args are not evalled at all.\n\
315 If no arg yields nil, return the last arg's value.")
319 register Lisp_Object val
;
320 Lisp_Object args_left
;
331 val
= Feval (Fcar (args_left
));
334 args_left
= Fcdr (args_left
);
336 while (!NILP(args_left
));
342 DEFUN ("if", Fif
, Sif
, 2, UNEVALLED
, 0,
343 "If COND yields non-nil, do THEN, else do ELSE...\n\
344 Returns the value of THEN or the value of the last of the ELSE's.\n\
345 THEN must be one expression, but ELSE... can be zero or more expressions.\n\
346 If COND yields nil, and there are no ELSE's, the value is nil.")
350 register Lisp_Object cond
;
354 cond
= Feval (Fcar (args
));
358 return Feval (Fcar (Fcdr (args
)));
359 return Fprogn (Fcdr (Fcdr (args
)));
362 DEFUN ("cond", Fcond
, Scond
, 0, UNEVALLED
, 0,
363 "Try each clause until one succeeds.\n\
364 Each clause looks like (CONDITION BODY...). CONDITION is evaluated\n\
365 and, if the value is non-nil, this clause succeeds:\n\
366 then the expressions in BODY are evaluated and the last one's\n\
367 value is the value of the cond-form.\n\
368 If no clause succeeds, cond returns nil.\n\
369 If a clause has one element, as in (CONDITION),\n\
370 CONDITION's value if non-nil is returned from the cond-form.")
374 register Lisp_Object clause
, val
;
381 clause
= Fcar (args
);
382 val
= Feval (Fcar (clause
));
385 if (!EQ (XCDR (clause
), Qnil
))
386 val
= Fprogn (XCDR (clause
));
396 DEFUN ("progn", Fprogn
, Sprogn
, 0, UNEVALLED
, 0,
397 "Eval BODY forms sequentially and return value of last one.")
401 register Lisp_Object val
, tem
;
402 Lisp_Object args_left
;
405 /* In Mocklisp code, symbols at the front of the progn arglist
406 are to be bound to zero. */
407 if (!EQ (Vmocklisp_arguments
, Qt
))
409 val
= make_number (0);
410 while (!NILP (args
) && (tem
= Fcar (args
), SYMBOLP (tem
)))
413 specbind (tem
, val
), args
= Fcdr (args
);
425 val
= Feval (Fcar (args_left
));
426 args_left
= Fcdr (args_left
);
428 while (!NILP(args_left
));
434 DEFUN ("prog1", Fprog1
, Sprog1
, 1, UNEVALLED
, 0,
435 "Eval FIRST and BODY sequentially; value from FIRST.\n\
436 The value of FIRST is saved during the evaluation of the remaining args,\n\
437 whose values are discarded.")
442 register Lisp_Object args_left
;
443 struct gcpro gcpro1
, gcpro2
;
444 register int argnum
= 0;
456 val
= Feval (Fcar (args_left
));
458 Feval (Fcar (args_left
));
459 args_left
= Fcdr (args_left
);
461 while (!NILP(args_left
));
467 DEFUN ("prog2", Fprog2
, Sprog2
, 2, UNEVALLED
, 0,
468 "Eval X, Y and BODY sequentially; value from Y.\n\
469 The value of Y is saved during the evaluation of the remaining args,\n\
470 whose values are discarded.")
475 register Lisp_Object args_left
;
476 struct gcpro gcpro1
, gcpro2
;
477 register int argnum
= -1;
491 val
= Feval (Fcar (args_left
));
493 Feval (Fcar (args_left
));
494 args_left
= Fcdr (args_left
);
496 while (!NILP (args_left
));
502 DEFUN ("setq", Fsetq
, Ssetq
, 0, UNEVALLED
, 0,
503 "Set each SYM to the value of its VAL.\n\
504 The symbols SYM are variables; they are literal (not evaluated).\n\
505 The values VAL are expressions; they are evaluated.\n\
506 Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.\n\
507 The second VAL is not computed until after the first SYM is set, and so on;\n\
508 each VAL can use the new value of variables set earlier in the `setq'.\n\
509 The return value of the `setq' form is the value of the last VAL.")
513 register Lisp_Object args_left
;
514 register Lisp_Object val
, sym
;
525 val
= Feval (Fcar (Fcdr (args_left
)));
526 sym
= Fcar (args_left
);
528 args_left
= Fcdr (Fcdr (args_left
));
530 while (!NILP(args_left
));
536 DEFUN ("quote", Fquote
, Squote
, 1, UNEVALLED
, 0,
537 "Return the argument, without evaluating it. `(quote x)' yields `x'.")
544 DEFUN ("function", Ffunction
, Sfunction
, 1, UNEVALLED
, 0,
545 "Like `quote', but preferred for objects which are functions.\n\
546 In byte compilation, `function' causes its argument to be compiled.\n\
547 `quote' cannot do that.")
555 DEFUN ("interactive-p", Finteractive_p
, Sinteractive_p
, 0, 0, 0,
556 "Return t if function in which this appears was called interactively.\n\
557 This means that the function was called with call-interactively (which\n\
558 includes being called as the binding of a key)\n\
559 and input is currently coming from the keyboard (not in keyboard macro).")
562 return interactive_p (1) ? Qt
: Qnil
;
566 /* Return 1 if function in which this appears was called
567 interactively. This means that the function was called with
568 call-interactively (which includes being called as the binding of
569 a key) and input is currently coming from the keyboard (not in
572 EXCLUDE_SUBRS_P non-zero means always return 0 if the function
573 called is a built-in. */
576 interactive_p (exclude_subrs_p
)
579 struct backtrace
*btp
;
585 btp
= backtrace_list
;
587 /* If this isn't a byte-compiled function, there may be a frame at
588 the top for Finteractive_p. If so, skip it. */
589 fun
= Findirect_function (*btp
->function
);
590 if (SUBRP (fun
) && XSUBR (fun
) == &Sinteractive_p
)
593 /* If we're running an Emacs 18-style byte-compiled function, there
594 may be a frame for Fbytecode. Now, given the strictest
595 definition, this function isn't really being called
596 interactively, but because that's the way Emacs 18 always builds
597 byte-compiled functions, we'll accept it for now. */
598 if (EQ (*btp
->function
, Qbytecode
))
601 /* If this isn't a byte-compiled function, then we may now be
602 looking at several frames for special forms. Skip past them. */
604 btp
->nargs
== UNEVALLED
)
607 /* btp now points at the frame of the innermost function that isn't
608 a special form, ignoring frames for Finteractive_p and/or
609 Fbytecode at the top. If this frame is for a built-in function
610 (such as load or eval-region) return nil. */
611 fun
= Findirect_function (*btp
->function
);
612 if (exclude_subrs_p
&& SUBRP (fun
))
615 /* btp points to the frame of a Lisp function that called interactive-p.
616 Return t if that function was called interactively. */
617 if (btp
&& btp
->next
&& EQ (*btp
->next
->function
, Qcall_interactively
))
623 DEFUN ("defun", Fdefun
, Sdefun
, 2, UNEVALLED
, 0,
624 "Define NAME as a function.\n\
625 The definition is (lambda ARGLIST [DOCSTRING] BODY...).\n\
626 See also the function `interactive'.")
630 register Lisp_Object fn_name
;
631 register Lisp_Object defn
;
633 fn_name
= Fcar (args
);
634 defn
= Fcons (Qlambda
, Fcdr (args
));
635 if (!NILP (Vpurify_flag
))
636 defn
= Fpurecopy (defn
);
637 Ffset (fn_name
, defn
);
638 LOADHIST_ATTACH (fn_name
);
642 DEFUN ("defmacro", Fdefmacro
, Sdefmacro
, 2, UNEVALLED
, 0,
643 "Define NAME as a macro.\n\
644 The definition is (macro lambda ARGLIST [DOCSTRING] BODY...).\n\
645 When the macro is called, as in (NAME ARGS...),\n\
646 the function (lambda ARGLIST BODY...) is applied to\n\
647 the list ARGS... as it appears in the expression,\n\
648 and the result should be a form to be evaluated instead of the original.")
652 register Lisp_Object fn_name
;
653 register Lisp_Object defn
;
655 fn_name
= Fcar (args
);
656 defn
= Fcons (Qmacro
, Fcons (Qlambda
, Fcdr (args
)));
657 if (!NILP (Vpurify_flag
))
658 defn
= Fpurecopy (defn
);
659 Ffset (fn_name
, defn
);
660 LOADHIST_ATTACH (fn_name
);
664 DEFUN ("defvar", Fdefvar
, Sdefvar
, 1, UNEVALLED
, 0,
665 "Define SYMBOL as a variable.\n\
666 You are not required to define a variable in order to use it,\n\
667 but the definition can supply documentation and an initial value\n\
668 in a way that tags can recognize.\n\n\
669 INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.\n\
670 If SYMBOL is buffer-local, its default value is what is set;\n\
671 buffer-local values are not affected.\n\
672 INITVALUE and DOCSTRING are optional.\n\
673 If DOCSTRING starts with *, this variable is identified as a user option.\n\
674 This means that M-x set-variable recognizes it.\n\
675 See also `user-variable-p'.\n\
676 If INITVALUE is missing, SYMBOL's value is not set.")
680 register Lisp_Object sym
, tem
, tail
;
684 if (!NILP (Fcdr (Fcdr (tail
))))
685 error ("too many arguments");
689 tem
= Fdefault_boundp (sym
);
691 Fset_default (sym
, Feval (Fcar (Fcdr (args
))));
693 tail
= Fcdr (Fcdr (args
));
694 if (!NILP (Fcar (tail
)))
697 if (!NILP (Vpurify_flag
))
698 tem
= Fpurecopy (tem
);
699 Fput (sym
, Qvariable_documentation
, tem
);
701 LOADHIST_ATTACH (sym
);
705 DEFUN ("defconst", Fdefconst
, Sdefconst
, 2, UNEVALLED
, 0,
706 "Define SYMBOL as a constant variable.\n\
707 The intent is that neither programs nor users should ever change this value.\n\
708 Always sets the value of SYMBOL to the result of evalling INITVALUE.\n\
709 If SYMBOL is buffer-local, its default value is what is set;\n\
710 buffer-local values are not affected.\n\
711 DOCSTRING is optional.")
715 register Lisp_Object sym
, tem
;
718 if (!NILP (Fcdr (Fcdr (Fcdr (args
)))))
719 error ("too many arguments");
721 tem
= Feval (Fcar (Fcdr (args
)));
722 if (!NILP (Vpurify_flag
))
723 tem
= Fpurecopy (tem
);
724 Fset_default (sym
, tem
);
725 tem
= Fcar (Fcdr (Fcdr (args
)));
728 if (!NILP (Vpurify_flag
))
729 tem
= Fpurecopy (tem
);
730 Fput (sym
, Qvariable_documentation
, tem
);
732 LOADHIST_ATTACH (sym
);
736 DEFUN ("user-variable-p", Fuser_variable_p
, Suser_variable_p
, 1, 1, 0,
737 "Returns t if VARIABLE is intended to be set and modified by users.\n\
738 \(The alternative is a variable used internally in a Lisp program.)\n\
739 Determined by whether the first character of the documentation\n\
740 for the variable is `*' or if the variable is customizable (has a non-nil\n\
741 value of any of `custom-type', `custom-loads' or `standard-value'\n\
742 on its property list).")
744 Lisp_Object variable
;
746 Lisp_Object documentation
;
748 if (!SYMBOLP (variable
))
751 documentation
= Fget (variable
, Qvariable_documentation
);
752 if (INTEGERP (documentation
) && XINT (documentation
) < 0)
754 if (STRINGP (documentation
)
755 && ((unsigned char) XSTRING (documentation
)->data
[0] == '*'))
757 /* If it is (STRING . INTEGER), a negative integer means a user variable. */
758 if (CONSP (documentation
)
759 && STRINGP (XCAR (documentation
))
760 && INTEGERP (XCDR (documentation
))
761 && XINT (XCDR (documentation
)) < 0)
764 if ((!NILP (Fget (variable
, intern ("custom-type"))))
765 || (!NILP (Fget (variable
, intern ("custom-loads"))))
766 || (!NILP (Fget (variable
, intern ("standard-value")))))
771 DEFUN ("let*", FletX
, SletX
, 1, UNEVALLED
, 0,
772 "Bind variables according to VARLIST then eval BODY.\n\
773 The value of the last form in BODY is returned.\n\
774 Each element of VARLIST is a symbol (which is bound to nil)\n\
775 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\
776 Each VALUEFORM can refer to the symbols already bound by this VARLIST.")
780 Lisp_Object varlist
, val
, elt
;
781 int count
= specpdl_ptr
- specpdl
;
782 struct gcpro gcpro1
, gcpro2
, gcpro3
;
784 GCPRO3 (args
, elt
, varlist
);
786 varlist
= Fcar (args
);
787 while (!NILP (varlist
))
790 elt
= Fcar (varlist
);
792 specbind (elt
, Qnil
);
793 else if (! NILP (Fcdr (Fcdr (elt
))))
795 Fcons (build_string ("`let' bindings can have only one value-form"),
799 val
= Feval (Fcar (Fcdr (elt
)));
800 specbind (Fcar (elt
), val
);
802 varlist
= Fcdr (varlist
);
805 val
= Fprogn (Fcdr (args
));
806 return unbind_to (count
, val
);
809 DEFUN ("let", Flet
, Slet
, 1, UNEVALLED
, 0,
810 "Bind variables according to VARLIST then eval BODY.\n\
811 The value of the last form in BODY is returned.\n\
812 Each element of VARLIST is a symbol (which is bound to nil)\n\
813 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\
814 All the VALUEFORMs are evalled before any symbols are bound.")
818 Lisp_Object
*temps
, tem
;
819 register Lisp_Object elt
, varlist
;
820 int count
= specpdl_ptr
- specpdl
;
822 struct gcpro gcpro1
, gcpro2
;
824 varlist
= Fcar (args
);
826 /* Make space to hold the values to give the bound variables */
827 elt
= Flength (varlist
);
828 temps
= (Lisp_Object
*) alloca (XFASTINT (elt
) * sizeof (Lisp_Object
));
830 /* Compute the values and store them in `temps' */
832 GCPRO2 (args
, *temps
);
835 for (argnum
= 0; !NILP (varlist
); varlist
= Fcdr (varlist
))
838 elt
= Fcar (varlist
);
840 temps
[argnum
++] = Qnil
;
841 else if (! NILP (Fcdr (Fcdr (elt
))))
843 Fcons (build_string ("`let' bindings can have only one value-form"),
846 temps
[argnum
++] = Feval (Fcar (Fcdr (elt
)));
847 gcpro2
.nvars
= argnum
;
851 varlist
= Fcar (args
);
852 for (argnum
= 0; !NILP (varlist
); varlist
= Fcdr (varlist
))
854 elt
= Fcar (varlist
);
855 tem
= temps
[argnum
++];
859 specbind (Fcar (elt
), tem
);
862 elt
= Fprogn (Fcdr (args
));
863 return unbind_to (count
, elt
);
866 DEFUN ("while", Fwhile
, Swhile
, 1, UNEVALLED
, 0,
867 "If TEST yields non-nil, eval BODY... and repeat.\n\
868 The order of execution is thus TEST, BODY, TEST, BODY and so on\n\
869 until TEST returns nil.")
873 Lisp_Object test
, body
, tem
;
874 struct gcpro gcpro1
, gcpro2
;
880 while (tem
= Feval (test
),
881 (!EQ (Vmocklisp_arguments
, Qt
) ? XINT (tem
) : !NILP (tem
)))
891 DEFUN ("macroexpand", Fmacroexpand
, Smacroexpand
, 1, 2, 0,
892 "Return result of expanding macros at top level of FORM.\n\
893 If FORM is not a macro call, it is returned unchanged.\n\
894 Otherwise, the macro is expanded and the expansion is considered\n\
895 in place of FORM. When a non-macro-call results, it is returned.\n\n\
896 The second optional arg ENVIRONMENT specifies an environment of macro\n\
897 definitions to shadow the loaded ones for use in file byte-compilation.")
900 Lisp_Object environment
;
902 /* With cleanups from Hallvard Furuseth. */
903 register Lisp_Object expander
, sym
, def
, tem
;
907 /* Come back here each time we expand a macro call,
908 in case it expands into another macro call. */
911 /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */
912 def
= sym
= XCAR (form
);
914 /* Trace symbols aliases to other symbols
915 until we get a symbol that is not an alias. */
916 while (SYMBOLP (def
))
920 tem
= Fassq (sym
, environment
);
923 def
= XSYMBOL (sym
)->function
;
924 if (!EQ (def
, Qunbound
))
929 /* Right now TEM is the result from SYM in ENVIRONMENT,
930 and if TEM is nil then DEF is SYM's function definition. */
933 /* SYM is not mentioned in ENVIRONMENT.
934 Look at its function definition. */
935 if (EQ (def
, Qunbound
) || !CONSP (def
))
936 /* Not defined or definition not suitable */
938 if (EQ (XCAR (def
), Qautoload
))
940 /* Autoloading function: will it be a macro when loaded? */
941 tem
= Fnth (make_number (4), def
);
942 if (EQ (tem
, Qt
) || EQ (tem
, Qmacro
))
943 /* Yes, load it and try again. */
947 do_autoload (def
, sym
);
954 else if (!EQ (XCAR (def
), Qmacro
))
956 else expander
= XCDR (def
);
960 expander
= XCDR (tem
);
964 form
= apply1 (expander
, XCDR (form
));
969 DEFUN ("catch", Fcatch
, Scatch
, 1, UNEVALLED
, 0,
970 "Eval BODY allowing nonlocal exits using `throw'.\n\
971 TAG is evalled to get the tag to use; it must not be nil.\n\
973 Then the BODY is executed.\n\
974 Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.\n\
975 If no throw happens, `catch' returns the value of the last BODY form.\n\
976 If a throw happens, it specifies the value to return from `catch'.")
980 register Lisp_Object tag
;
984 tag
= Feval (Fcar (args
));
986 return internal_catch (tag
, Fprogn
, Fcdr (args
));
989 /* Set up a catch, then call C function FUNC on argument ARG.
990 FUNC should return a Lisp_Object.
991 This is how catches are done from within C code. */
994 internal_catch (tag
, func
, arg
)
996 Lisp_Object (*func
) ();
999 /* This structure is made part of the chain `catchlist'. */
1002 /* Fill in the components of c, and put it on the list. */
1006 c
.backlist
= backtrace_list
;
1007 c
.handlerlist
= handlerlist
;
1008 c
.lisp_eval_depth
= lisp_eval_depth
;
1009 c
.pdlcount
= specpdl_ptr
- specpdl
;
1010 c
.poll_suppress_count
= poll_suppress_count
;
1011 c
.gcpro
= gcprolist
;
1012 c
.byte_stack
= byte_stack_list
;
1016 if (! _setjmp (c
.jmp
))
1017 c
.val
= (*func
) (arg
);
1019 /* Throw works by a longjmp that comes right here. */
1024 /* Unwind the specbind, catch, and handler stacks back to CATCH, and
1025 jump to that CATCH, returning VALUE as the value of that catch.
1027 This is the guts Fthrow and Fsignal; they differ only in the way
1028 they choose the catch tag to throw to. A catch tag for a
1029 condition-case form has a TAG of Qnil.
1031 Before each catch is discarded, unbind all special bindings and
1032 execute all unwind-protect clauses made above that catch. Unwind
1033 the handler stack as we go, so that the proper handlers are in
1034 effect for each unwind-protect clause we run. At the end, restore
1035 some static info saved in CATCH, and longjmp to the location
1038 This is used for correct unwinding in Fthrow and Fsignal. */
1041 unwind_to_catch (catch, value
)
1042 struct catchtag
*catch;
1045 register int last_time
;
1047 /* Save the value in the tag. */
1050 /* Restore the polling-suppression count. */
1051 set_poll_suppress_count (catch->poll_suppress_count
);
1055 last_time
= catchlist
== catch;
1057 /* Unwind the specpdl stack, and then restore the proper set of
1059 unbind_to (catchlist
->pdlcount
, Qnil
);
1060 handlerlist
= catchlist
->handlerlist
;
1061 catchlist
= catchlist
->next
;
1063 while (! last_time
);
1065 byte_stack_list
= catch->byte_stack
;
1066 gcprolist
= catch->gcpro
;
1069 gcpro_level
= gcprolist
->level
+ 1;
1073 backtrace_list
= catch->backlist
;
1074 lisp_eval_depth
= catch->lisp_eval_depth
;
1076 _longjmp (catch->jmp
, 1);
1079 DEFUN ("throw", Fthrow
, Sthrow
, 2, 2, 0,
1080 "Throw to the catch for TAG and return VALUE from it.\n\
1081 Both TAG and VALUE are evalled.")
1083 register Lisp_Object tag
, value
;
1085 register struct catchtag
*c
;
1090 for (c
= catchlist
; c
; c
= c
->next
)
1092 if (EQ (c
->tag
, tag
))
1093 unwind_to_catch (c
, value
);
1095 tag
= Fsignal (Qno_catch
, Fcons (tag
, Fcons (value
, Qnil
)));
1100 DEFUN ("unwind-protect", Funwind_protect
, Sunwind_protect
, 1, UNEVALLED
, 0,
1101 "Do BODYFORM, protecting with UNWINDFORMS.\n\
1102 If BODYFORM completes normally, its value is returned\n\
1103 after executing the UNWINDFORMS.\n\
1104 If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.")
1109 int count
= specpdl_ptr
- specpdl
;
1111 record_unwind_protect (0, Fcdr (args
));
1112 val
= Feval (Fcar (args
));
1113 return unbind_to (count
, val
);
1116 /* Chain of condition handlers currently in effect.
1117 The elements of this chain are contained in the stack frames
1118 of Fcondition_case and internal_condition_case.
1119 When an error is signaled (by calling Fsignal, below),
1120 this chain is searched for an element that applies. */
1122 struct handler
*handlerlist
;
1124 DEFUN ("condition-case", Fcondition_case
, Scondition_case
, 2, UNEVALLED
, 0,
1125 "Regain control when an error is signaled.\n\
1126 executes BODYFORM and returns its value if no error happens.\n\
1127 Each element of HANDLERS looks like (CONDITION-NAME BODY...)\n\
1128 where the BODY is made of Lisp expressions.\n\n\
1129 A handler is applicable to an error\n\
1130 if CONDITION-NAME is one of the error's condition names.\n\
1131 If an error happens, the first applicable handler is run.\n\
1133 The car of a handler may be a list of condition names\n\
1134 instead of a single condition name.\n\
1136 When a handler handles an error,\n\
1137 control returns to the condition-case and the handler BODY... is executed\n\
1138 with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).\n\
1139 VAR may be nil; then you do not get access to the signal information.\n\
1141 The value of the last BODY form is returned from the condition-case.\n\
1142 See also the function `signal' for more info.")
1149 register Lisp_Object bodyform
, handlers
;
1150 volatile Lisp_Object var
;
1153 bodyform
= Fcar (Fcdr (args
));
1154 handlers
= Fcdr (Fcdr (args
));
1155 CHECK_SYMBOL (var
, 0);
1157 for (val
= handlers
; ! NILP (val
); val
= Fcdr (val
))
1163 && (SYMBOLP (XCAR (tem
))
1164 || CONSP (XCAR (tem
))))))
1165 error ("Invalid condition handler", tem
);
1170 c
.backlist
= backtrace_list
;
1171 c
.handlerlist
= handlerlist
;
1172 c
.lisp_eval_depth
= lisp_eval_depth
;
1173 c
.pdlcount
= specpdl_ptr
- specpdl
;
1174 c
.poll_suppress_count
= poll_suppress_count
;
1175 c
.gcpro
= gcprolist
;
1176 c
.byte_stack
= byte_stack_list
;
1177 if (_setjmp (c
.jmp
))
1180 specbind (h
.var
, c
.val
);
1181 val
= Fprogn (Fcdr (h
.chosen_clause
));
1183 /* Note that this just undoes the binding of h.var; whoever
1184 longjumped to us unwound the stack to c.pdlcount before
1186 unbind_to (c
.pdlcount
, Qnil
);
1193 h
.handler
= handlers
;
1194 h
.next
= handlerlist
;
1198 val
= Feval (bodyform
);
1200 handlerlist
= h
.next
;
1204 /* Call the function BFUN with no arguments, catching errors within it
1205 according to HANDLERS. If there is an error, call HFUN with
1206 one argument which is the data that describes the error:
1209 HANDLERS can be a list of conditions to catch.
1210 If HANDLERS is Qt, catch all errors.
1211 If HANDLERS is Qerror, catch all errors
1212 but allow the debugger to run if that is enabled. */
1215 internal_condition_case (bfun
, handlers
, hfun
)
1216 Lisp_Object (*bfun
) ();
1217 Lisp_Object handlers
;
1218 Lisp_Object (*hfun
) ();
1224 #if 0 /* Can't do this check anymore because realize_basic_faces has
1225 to BLOCK_INPUT, and can call Lisp. What's really needed is a
1226 flag indicating that we're currently handling a signal. */
1227 /* Since Fsignal resets this to 0, it had better be 0 now
1228 or else we have a potential bug. */
1229 if (interrupt_input_blocked
!= 0)
1235 c
.backlist
= backtrace_list
;
1236 c
.handlerlist
= handlerlist
;
1237 c
.lisp_eval_depth
= lisp_eval_depth
;
1238 c
.pdlcount
= specpdl_ptr
- specpdl
;
1239 c
.poll_suppress_count
= poll_suppress_count
;
1240 c
.gcpro
= gcprolist
;
1241 c
.byte_stack
= byte_stack_list
;
1242 if (_setjmp (c
.jmp
))
1244 return (*hfun
) (c
.val
);
1248 h
.handler
= handlers
;
1250 h
.next
= handlerlist
;
1256 handlerlist
= h
.next
;
1260 /* Like internal_condition_case but call HFUN with ARG as its argument. */
1263 internal_condition_case_1 (bfun
, arg
, handlers
, hfun
)
1264 Lisp_Object (*bfun
) ();
1266 Lisp_Object handlers
;
1267 Lisp_Object (*hfun
) ();
1275 c
.backlist
= backtrace_list
;
1276 c
.handlerlist
= handlerlist
;
1277 c
.lisp_eval_depth
= lisp_eval_depth
;
1278 c
.pdlcount
= specpdl_ptr
- specpdl
;
1279 c
.poll_suppress_count
= poll_suppress_count
;
1280 c
.gcpro
= gcprolist
;
1281 c
.byte_stack
= byte_stack_list
;
1282 if (_setjmp (c
.jmp
))
1284 return (*hfun
) (c
.val
);
1288 h
.handler
= handlers
;
1290 h
.next
= handlerlist
;
1294 val
= (*bfun
) (arg
);
1296 handlerlist
= h
.next
;
1301 /* Like internal_condition_case but call HFUN with NARGS as first,
1302 and ARGS as second argument. */
1305 internal_condition_case_2 (bfun
, nargs
, args
, handlers
, hfun
)
1306 Lisp_Object (*bfun
) ();
1309 Lisp_Object handlers
;
1310 Lisp_Object (*hfun
) ();
1318 c
.backlist
= backtrace_list
;
1319 c
.handlerlist
= handlerlist
;
1320 c
.lisp_eval_depth
= lisp_eval_depth
;
1321 c
.pdlcount
= specpdl_ptr
- specpdl
;
1322 c
.poll_suppress_count
= poll_suppress_count
;
1323 c
.gcpro
= gcprolist
;
1324 c
.byte_stack
= byte_stack_list
;
1325 if (_setjmp (c
.jmp
))
1327 return (*hfun
) (c
.val
);
1331 h
.handler
= handlers
;
1333 h
.next
= handlerlist
;
1337 val
= (*bfun
) (nargs
, args
);
1339 handlerlist
= h
.next
;
1344 static Lisp_Object
find_handler_clause ();
1346 DEFUN ("signal", Fsignal
, Ssignal
, 2, 2, 0,
1347 "Signal an error. Args are ERROR-SYMBOL and associated DATA.\n\
1348 This function does not return.\n\n\
1349 An error symbol is a symbol with an `error-conditions' property\n\
1350 that is a list of condition names.\n\
1351 A handler for any of those names will get to handle this signal.\n\
1352 The symbol `error' should normally be one of them.\n\
1354 DATA should be a list. Its elements are printed as part of the error message.\n\
1355 If the signal is handled, DATA is made available to the handler.\n\
1356 See also the function `condition-case'.")
1357 (error_symbol
, data
)
1358 Lisp_Object error_symbol
, data
;
1360 /* When memory is full, ERROR-SYMBOL is nil,
1361 and DATA is (REAL-ERROR-SYMBOL . REAL-DATA). */
1362 register struct handler
*allhandlers
= handlerlist
;
1363 Lisp_Object conditions
;
1364 extern int gc_in_progress
;
1365 extern int waiting_for_input
;
1366 Lisp_Object debugger_value
;
1368 Lisp_Object real_error_symbol
;
1369 extern int display_busy_cursor_p
;
1370 struct backtrace
*bp
;
1372 immediate_quit
= handling_signal
= 0;
1373 if (gc_in_progress
|| waiting_for_input
)
1376 TOTALLY_UNBLOCK_INPUT
;
1378 if (NILP (error_symbol
))
1379 real_error_symbol
= Fcar (data
);
1381 real_error_symbol
= error_symbol
;
1383 #ifdef HAVE_X_WINDOWS
1384 if (display_busy_cursor_p
)
1385 cancel_busy_cursor ();
1388 /* This hook is used by edebug. */
1389 if (! NILP (Vsignal_hook_function
))
1390 call2 (Vsignal_hook_function
, error_symbol
, data
);
1392 conditions
= Fget (real_error_symbol
, Qerror_conditions
);
1394 /* Remember from where signal was called. Skip over the frame for
1395 `signal' itself. If a frame for `error' follows, skip that,
1397 Vsignaling_function
= Qnil
;
1400 bp
= backtrace_list
->next
;
1401 if (bp
&& bp
->function
&& EQ (*bp
->function
, Qerror
))
1403 if (bp
&& bp
->function
)
1404 Vsignaling_function
= *bp
->function
;
1407 for (; handlerlist
; handlerlist
= handlerlist
->next
)
1409 register Lisp_Object clause
;
1411 if (lisp_eval_depth
+ 20 > max_lisp_eval_depth
)
1412 max_lisp_eval_depth
= lisp_eval_depth
+ 20;
1414 if (specpdl_size
+ 40 > max_specpdl_size
)
1415 max_specpdl_size
= specpdl_size
+ 40;
1417 clause
= find_handler_clause (handlerlist
->handler
, conditions
,
1418 error_symbol
, data
, &debugger_value
);
1420 #if 0 /* Most callers are not prepared to handle gc if this returns.
1421 So, since this feature is not very useful, take it out. */
1422 /* If have called debugger and user wants to continue,
1424 if (EQ (clause
, Qlambda
))
1425 return debugger_value
;
1427 if (EQ (clause
, Qlambda
))
1429 /* We can't return values to code which signaled an error, but we
1430 can continue code which has signaled a quit. */
1431 if (EQ (real_error_symbol
, Qquit
))
1434 error ("Cannot return from the debugger in an error");
1440 Lisp_Object unwind_data
;
1441 struct handler
*h
= handlerlist
;
1443 handlerlist
= allhandlers
;
1445 if (NILP (error_symbol
))
1448 unwind_data
= Fcons (error_symbol
, data
);
1449 h
->chosen_clause
= clause
;
1450 unwind_to_catch (h
->tag
, unwind_data
);
1454 handlerlist
= allhandlers
;
1455 /* If no handler is present now, try to run the debugger,
1456 and if that fails, throw to top level. */
1457 find_handler_clause (Qerror
, conditions
, error_symbol
, data
, &debugger_value
);
1459 Fthrow (Qtop_level
, Qt
);
1461 if (! NILP (error_symbol
))
1462 data
= Fcons (error_symbol
, data
);
1464 string
= Ferror_message_string (data
);
1465 fatal ("%s", XSTRING (string
)->data
, 0);
1468 /* Return nonzero iff LIST is a non-nil atom or
1469 a list containing one of CONDITIONS. */
1472 wants_debugger (list
, conditions
)
1473 Lisp_Object list
, conditions
;
1480 while (CONSP (conditions
))
1482 Lisp_Object
this, tail
;
1483 this = XCAR (conditions
);
1484 for (tail
= list
; CONSP (tail
); tail
= XCDR (tail
))
1485 if (EQ (XCAR (tail
), this))
1487 conditions
= XCDR (conditions
);
1492 /* Return 1 if an error with condition-symbols CONDITIONS,
1493 and described by SIGNAL-DATA, should skip the debugger
1494 according to debugger-ignore-errors. */
1497 skip_debugger (conditions
, data
)
1498 Lisp_Object conditions
, data
;
1501 int first_string
= 1;
1502 Lisp_Object error_message
;
1504 error_message
= Qnil
;
1505 for (tail
= Vdebug_ignored_errors
; CONSP (tail
); tail
= XCDR (tail
))
1507 if (STRINGP (XCAR (tail
)))
1511 error_message
= Ferror_message_string (data
);
1515 if (fast_string_match (XCAR (tail
), error_message
) >= 0)
1520 Lisp_Object contail
;
1522 for (contail
= conditions
; CONSP (contail
); contail
= XCDR (contail
))
1523 if (EQ (XCAR (tail
), XCAR (contail
)))
1531 /* Value of Qlambda means we have called debugger and user has continued.
1532 There are two ways to pass SIG and DATA:
1533 = SIG is the error symbol, and DATA is the rest of the data.
1534 = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
1535 This is for memory-full errors only.
1537 Store value returned from debugger into *DEBUGGER_VALUE_PTR. */
1540 find_handler_clause (handlers
, conditions
, sig
, data
, debugger_value_ptr
)
1541 Lisp_Object handlers
, conditions
, sig
, data
;
1542 Lisp_Object
*debugger_value_ptr
;
1544 register Lisp_Object h
;
1545 register Lisp_Object tem
;
1547 if (EQ (handlers
, Qt
)) /* t is used by handlers for all conditions, set up by C code. */
1549 /* error is used similarly, but means print an error message
1550 and run the debugger if that is enabled. */
1551 if (EQ (handlers
, Qerror
)
1552 || !NILP (Vdebug_on_signal
)) /* This says call debugger even if
1553 there is a handler. */
1555 int count
= specpdl_ptr
- specpdl
;
1556 int debugger_called
= 0;
1557 Lisp_Object sig_symbol
, combined_data
;
1558 /* This is set to 1 if we are handling a memory-full error,
1559 because these must not run the debugger.
1560 (There is no room in memory to do that!) */
1561 int no_debugger
= 0;
1565 combined_data
= data
;
1566 sig_symbol
= Fcar (data
);
1571 combined_data
= Fcons (sig
, data
);
1575 if (wants_debugger (Vstack_trace_on_error
, conditions
))
1578 internal_with_output_to_temp_buffer ("*Backtrace*",
1579 (Lisp_Object (*) (Lisp_Object
)) Fbacktrace
,
1582 internal_with_output_to_temp_buffer ("*Backtrace*",
1587 && (EQ (sig_symbol
, Qquit
)
1589 : wants_debugger (Vdebug_on_error
, conditions
))
1590 && ! skip_debugger (conditions
, combined_data
)
1591 && when_entered_debugger
< num_nonmacro_input_events
)
1593 specbind (Qdebug_on_error
, Qnil
);
1595 = call_debugger (Fcons (Qerror
,
1596 Fcons (combined_data
, Qnil
)));
1597 debugger_called
= 1;
1599 /* If there is no handler, return saying whether we ran the debugger. */
1600 if (EQ (handlers
, Qerror
))
1602 if (debugger_called
)
1603 return unbind_to (count
, Qlambda
);
1607 for (h
= handlers
; CONSP (h
); h
= Fcdr (h
))
1609 Lisp_Object handler
, condit
;
1612 if (!CONSP (handler
))
1614 condit
= Fcar (handler
);
1615 /* Handle a single condition name in handler HANDLER. */
1616 if (SYMBOLP (condit
))
1618 tem
= Fmemq (Fcar (handler
), conditions
);
1622 /* Handle a list of condition names in handler HANDLER. */
1623 else if (CONSP (condit
))
1625 while (CONSP (condit
))
1627 tem
= Fmemq (Fcar (condit
), conditions
);
1630 condit
= XCDR (condit
);
1637 /* dump an error message; called like printf */
1641 error (m
, a1
, a2
, a3
)
1661 int used
= doprnt (buffer
, size
, m
, m
+ mlen
, 3, args
);
1666 buffer
= (char *) xrealloc (buffer
, size
);
1669 buffer
= (char *) xmalloc (size
);
1674 string
= build_string (buffer
);
1678 Fsignal (Qerror
, Fcons (string
, Qnil
));
1682 DEFUN ("commandp", Fcommandp
, Scommandp
, 1, 1, 0,
1683 "T if FUNCTION makes provisions for interactive calling.\n\
1684 This means it contains a description for how to read arguments to give it.\n\
1685 The value is nil for an invalid function or a symbol with no function\n\
1688 Interactively callable functions include strings and vectors (treated\n\
1689 as keyboard macros), lambda-expressions that contain a top-level call\n\
1690 to `interactive', autoload definitions made by `autoload' with non-nil\n\
1691 fourth argument, and some of the built-in functions of Lisp.\n\
1693 Also, a symbol satisfies `commandp' if its function definition does so.")
1695 Lisp_Object function
;
1697 register Lisp_Object fun
;
1698 register Lisp_Object funcar
;
1702 fun
= indirect_function (fun
);
1703 if (EQ (fun
, Qunbound
))
1706 /* Emacs primitives are interactive if their DEFUN specifies an
1707 interactive spec. */
1710 if (XSUBR (fun
)->prompt
)
1716 /* Bytecode objects are interactive if they are long enough to
1717 have an element whose index is COMPILED_INTERACTIVE, which is
1718 where the interactive spec is stored. */
1719 else if (COMPILEDP (fun
))
1720 return ((XVECTOR (fun
)->size
& PSEUDOVECTOR_SIZE_MASK
) > COMPILED_INTERACTIVE
1723 /* Strings and vectors are keyboard macros. */
1724 if (STRINGP (fun
) || VECTORP (fun
))
1727 /* Lists may represent commands. */
1730 funcar
= Fcar (fun
);
1731 if (!SYMBOLP (funcar
))
1732 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
1733 if (EQ (funcar
, Qlambda
))
1734 return Fassq (Qinteractive
, Fcdr (Fcdr (fun
)));
1735 if (EQ (funcar
, Qmocklisp
))
1736 return Qt
; /* All mocklisp functions can be called interactively */
1737 if (EQ (funcar
, Qautoload
))
1738 return Fcar (Fcdr (Fcdr (Fcdr (fun
))));
1744 DEFUN ("autoload", Fautoload
, Sautoload
, 2, 5, 0,
1745 "Define FUNCTION to autoload from FILE.\n\
1746 FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\
1747 Third arg DOCSTRING is documentation for the function.\n\
1748 Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\
1749 Fifth arg TYPE indicates the type of the object:\n\
1750 nil or omitted says FUNCTION is a function,\n\
1751 `keymap' says FUNCTION is really a keymap, and\n\
1752 `macro' or t says FUNCTION is really a macro.\n\
1753 Third through fifth args give info about the real definition.\n\
1754 They default to nil.\n\
1755 If FUNCTION is already defined other than as an autoload,\n\
1756 this does nothing and returns nil.")
1757 (function
, file
, docstring
, interactive
, type
)
1758 Lisp_Object function
, file
, docstring
, interactive
, type
;
1761 Lisp_Object args
[4];
1764 CHECK_SYMBOL (function
, 0);
1765 CHECK_STRING (file
, 1);
1767 /* If function is defined and not as an autoload, don't override */
1768 if (!EQ (XSYMBOL (function
)->function
, Qunbound
)
1769 && !(CONSP (XSYMBOL (function
)->function
)
1770 && EQ (XCAR (XSYMBOL (function
)->function
), Qautoload
)))
1773 if (NILP (Vpurify_flag
))
1774 /* Only add entries after dumping, because the ones before are
1775 not useful and else we get loads of them from the loaddefs.el. */
1776 LOADHIST_ATTACH (Fcons (Qautoload
, function
));
1780 args
[1] = docstring
;
1781 args
[2] = interactive
;
1784 return Ffset (function
, Fcons (Qautoload
, Flist (4, &args
[0])));
1785 #else /* NO_ARG_ARRAY */
1786 return Ffset (function
, Fcons (Qautoload
, Flist (4, &file
)));
1787 #endif /* not NO_ARG_ARRAY */
1791 un_autoload (oldqueue
)
1792 Lisp_Object oldqueue
;
1794 register Lisp_Object queue
, first
, second
;
1796 /* Queue to unwind is current value of Vautoload_queue.
1797 oldqueue is the shadowed value to leave in Vautoload_queue. */
1798 queue
= Vautoload_queue
;
1799 Vautoload_queue
= oldqueue
;
1800 while (CONSP (queue
))
1802 first
= Fcar (queue
);
1803 second
= Fcdr (first
);
1804 first
= Fcar (first
);
1805 if (EQ (second
, Qnil
))
1808 Ffset (first
, second
);
1809 queue
= Fcdr (queue
);
1814 /* Load an autoloaded function.
1815 FUNNAME is the symbol which is the function's name.
1816 FUNDEF is the autoload definition (a list). */
1819 do_autoload (fundef
, funname
)
1820 Lisp_Object fundef
, funname
;
1822 int count
= specpdl_ptr
- specpdl
;
1823 Lisp_Object fun
, queue
, first
, second
;
1824 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1827 CHECK_SYMBOL (funname
, 0);
1828 GCPRO3 (fun
, funname
, fundef
);
1830 /* Preserve the match data. */
1831 record_unwind_protect (Fset_match_data
, Fmatch_data (Qnil
, Qnil
));
1833 /* Value saved here is to be restored into Vautoload_queue. */
1834 record_unwind_protect (un_autoload
, Vautoload_queue
);
1835 Vautoload_queue
= Qt
;
1836 Fload (Fcar (Fcdr (fundef
)), Qnil
, noninteractive
? Qt
: Qnil
, Qnil
, Qt
);
1838 /* Save the old autoloads, in case we ever do an unload. */
1839 queue
= Vautoload_queue
;
1840 while (CONSP (queue
))
1842 first
= Fcar (queue
);
1843 second
= Fcdr (first
);
1844 first
= Fcar (first
);
1846 /* Note: This test is subtle. The cdr of an autoload-queue entry
1847 may be an atom if the autoload entry was generated by a defalias
1850 Fput (first
, Qautoload
, (Fcdr (second
)));
1852 queue
= Fcdr (queue
);
1855 /* Once loading finishes, don't undo it. */
1856 Vautoload_queue
= Qt
;
1857 unbind_to (count
, Qnil
);
1859 fun
= Findirect_function (fun
);
1861 if (!NILP (Fequal (fun
, fundef
)))
1862 error ("Autoloading failed to define function %s",
1863 XSYMBOL (funname
)->name
->data
);
1868 DEFUN ("eval", Feval
, Seval
, 1, 1, 0,
1869 "Evaluate FORM and return its value.")
1873 Lisp_Object fun
, val
, original_fun
, original_args
;
1875 struct backtrace backtrace
;
1876 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1878 if (handling_signal
)
1883 if (EQ (Vmocklisp_arguments
, Qt
))
1884 return Fsymbol_value (form
);
1885 val
= Fsymbol_value (form
);
1887 XSETFASTINT (val
, 0);
1888 else if (EQ (val
, Qt
))
1889 XSETFASTINT (val
, 1);
1896 if (consing_since_gc
> gc_cons_threshold
)
1899 Fgarbage_collect ();
1903 if (++lisp_eval_depth
> max_lisp_eval_depth
)
1905 if (max_lisp_eval_depth
< 100)
1906 max_lisp_eval_depth
= 100;
1907 if (lisp_eval_depth
> max_lisp_eval_depth
)
1908 error ("Lisp nesting exceeds max-lisp-eval-depth");
1911 original_fun
= Fcar (form
);
1912 original_args
= Fcdr (form
);
1914 backtrace
.next
= backtrace_list
;
1915 backtrace_list
= &backtrace
;
1916 backtrace
.function
= &original_fun
; /* This also protects them from gc */
1917 backtrace
.args
= &original_args
;
1918 backtrace
.nargs
= UNEVALLED
;
1919 backtrace
.evalargs
= 1;
1920 backtrace
.debug_on_exit
= 0;
1922 if (debug_on_next_call
)
1923 do_debug_on_call (Qt
);
1925 /* At this point, only original_fun and original_args
1926 have values that will be used below */
1928 fun
= Findirect_function (original_fun
);
1932 Lisp_Object numargs
;
1933 Lisp_Object argvals
[8];
1934 Lisp_Object args_left
;
1935 register int i
, maxargs
;
1937 args_left
= original_args
;
1938 numargs
= Flength (args_left
);
1940 if (XINT (numargs
) < XSUBR (fun
)->min_args
||
1941 (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< XINT (numargs
)))
1942 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (numargs
, Qnil
)));
1944 if (XSUBR (fun
)->max_args
== UNEVALLED
)
1946 backtrace
.evalargs
= 0;
1947 val
= (*XSUBR (fun
)->function
) (args_left
);
1951 if (XSUBR (fun
)->max_args
== MANY
)
1953 /* Pass a vector of evaluated arguments */
1955 register int argnum
= 0;
1957 vals
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
1959 GCPRO3 (args_left
, fun
, fun
);
1963 while (!NILP (args_left
))
1965 vals
[argnum
++] = Feval (Fcar (args_left
));
1966 args_left
= Fcdr (args_left
);
1967 gcpro3
.nvars
= argnum
;
1970 backtrace
.args
= vals
;
1971 backtrace
.nargs
= XINT (numargs
);
1973 val
= (*XSUBR (fun
)->function
) (XINT (numargs
), vals
);
1978 GCPRO3 (args_left
, fun
, fun
);
1979 gcpro3
.var
= argvals
;
1982 maxargs
= XSUBR (fun
)->max_args
;
1983 for (i
= 0; i
< maxargs
; args_left
= Fcdr (args_left
))
1985 argvals
[i
] = Feval (Fcar (args_left
));
1991 backtrace
.args
= argvals
;
1992 backtrace
.nargs
= XINT (numargs
);
1997 val
= (*XSUBR (fun
)->function
) ();
2000 val
= (*XSUBR (fun
)->function
) (argvals
[0]);
2003 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1]);
2006 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
2010 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
2011 argvals
[2], argvals
[3]);
2014 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2015 argvals
[3], argvals
[4]);
2018 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2019 argvals
[3], argvals
[4], argvals
[5]);
2022 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2023 argvals
[3], argvals
[4], argvals
[5],
2028 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
2029 argvals
[3], argvals
[4], argvals
[5],
2030 argvals
[6], argvals
[7]);
2034 /* Someone has created a subr that takes more arguments than
2035 is supported by this code. We need to either rewrite the
2036 subr to use a different argument protocol, or add more
2037 cases to this switch. */
2041 if (COMPILEDP (fun
))
2042 val
= apply_lambda (fun
, original_args
, 1);
2046 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2047 funcar
= Fcar (fun
);
2048 if (!SYMBOLP (funcar
))
2049 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2050 if (EQ (funcar
, Qautoload
))
2052 do_autoload (fun
, original_fun
);
2055 if (EQ (funcar
, Qmacro
))
2056 val
= Feval (apply1 (Fcdr (fun
), original_args
));
2057 else if (EQ (funcar
, Qlambda
))
2058 val
= apply_lambda (fun
, original_args
, 1);
2059 else if (EQ (funcar
, Qmocklisp
))
2060 val
= ml_apply (fun
, original_args
);
2062 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2065 if (!EQ (Vmocklisp_arguments
, Qt
))
2068 XSETFASTINT (val
, 0);
2069 else if (EQ (val
, Qt
))
2070 XSETFASTINT (val
, 1);
2073 if (backtrace
.debug_on_exit
)
2074 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
2075 backtrace_list
= backtrace
.next
;
2079 DEFUN ("apply", Fapply
, Sapply
, 2, MANY
, 0,
2080 "Call FUNCTION with our remaining args, using our last arg as list of args.\n\
2081 Then return the value FUNCTION returns.\n\
2082 Thus, (apply '+ 1 2 '(3 4)) returns 10.")
2087 register int i
, numargs
;
2088 register Lisp_Object spread_arg
;
2089 register Lisp_Object
*funcall_args
;
2091 struct gcpro gcpro1
;
2095 spread_arg
= args
[nargs
- 1];
2096 CHECK_LIST (spread_arg
, nargs
);
2098 numargs
= XINT (Flength (spread_arg
));
2101 return Ffuncall (nargs
- 1, args
);
2102 else if (numargs
== 1)
2104 args
[nargs
- 1] = XCAR (spread_arg
);
2105 return Ffuncall (nargs
, args
);
2108 numargs
+= nargs
- 2;
2110 fun
= indirect_function (fun
);
2111 if (EQ (fun
, Qunbound
))
2113 /* Let funcall get the error */
2120 if (numargs
< XSUBR (fun
)->min_args
2121 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2122 goto funcall
; /* Let funcall get the error */
2123 else if (XSUBR (fun
)->max_args
> numargs
)
2125 /* Avoid making funcall cons up a yet another new vector of arguments
2126 by explicitly supplying nil's for optional values */
2127 funcall_args
= (Lisp_Object
*) alloca ((1 + XSUBR (fun
)->max_args
)
2128 * sizeof (Lisp_Object
));
2129 for (i
= numargs
; i
< XSUBR (fun
)->max_args
;)
2130 funcall_args
[++i
] = Qnil
;
2131 GCPRO1 (*funcall_args
);
2132 gcpro1
.nvars
= 1 + XSUBR (fun
)->max_args
;
2136 /* We add 1 to numargs because funcall_args includes the
2137 function itself as well as its arguments. */
2140 funcall_args
= (Lisp_Object
*) alloca ((1 + numargs
)
2141 * sizeof (Lisp_Object
));
2142 GCPRO1 (*funcall_args
);
2143 gcpro1
.nvars
= 1 + numargs
;
2146 bcopy (args
, funcall_args
, nargs
* sizeof (Lisp_Object
));
2147 /* Spread the last arg we got. Its first element goes in
2148 the slot that it used to occupy, hence this value of I. */
2150 while (!NILP (spread_arg
))
2152 funcall_args
[i
++] = XCAR (spread_arg
);
2153 spread_arg
= XCDR (spread_arg
);
2156 RETURN_UNGCPRO (Ffuncall (gcpro1
.nvars
, funcall_args
));
2159 /* Run hook variables in various ways. */
2161 enum run_hooks_condition
{to_completion
, until_success
, until_failure
};
2163 DEFUN ("run-hooks", Frun_hooks
, Srun_hooks
, 0, MANY
, 0,
2164 "Run each hook in HOOKS. Major mode functions use this.\n\
2165 Each argument should be a symbol, a hook variable.\n\
2166 These symbols are processed in the order specified.\n\
2167 If a hook symbol has a non-nil value, that value may be a function\n\
2168 or a list of functions to be called to run the hook.\n\
2169 If the value is a function, it is called with no arguments.\n\
2170 If it is a list, the elements are called, in order, with no arguments.\n\
2172 To make a hook variable buffer-local, use `make-local-hook',\n\
2173 not `make-local-variable'.")
2178 Lisp_Object hook
[1];
2181 for (i
= 0; i
< nargs
; i
++)
2184 run_hook_with_args (1, hook
, to_completion
);
2190 DEFUN ("run-hook-with-args", Frun_hook_with_args
,
2191 Srun_hook_with_args
, 1, MANY
, 0,
2192 "Run HOOK with the specified arguments ARGS.\n\
2193 HOOK should be a symbol, a hook variable. If HOOK has a non-nil\n\
2194 value, that value may be a function or a list of functions to be\n\
2195 called to run the hook. If the value is a function, it is called with\n\
2196 the given arguments and its return value is returned. If it is a list\n\
2197 of functions, those functions are called, in order,\n\
2198 with the given arguments ARGS.\n\
2199 It is best not to depend on the value return by `run-hook-with-args',\n\
2200 as that may change.\n\
2202 To make a hook variable buffer-local, use `make-local-hook',\n\
2203 not `make-local-variable'.")
2208 return run_hook_with_args (nargs
, args
, to_completion
);
2211 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success
,
2212 Srun_hook_with_args_until_success
, 1, MANY
, 0,
2213 "Run HOOK with the specified arguments ARGS.\n\
2214 HOOK should be a symbol, a hook variable. Its value should\n\
2215 be a list of functions. We call those functions, one by one,\n\
2216 passing arguments ARGS to each of them, until one of them\n\
2217 returns a non-nil value. Then we return that value.\n\
2218 If all the functions return nil, we return nil.\n\
2220 To make a hook variable buffer-local, use `make-local-hook',\n\
2221 not `make-local-variable'.")
2226 return run_hook_with_args (nargs
, args
, until_success
);
2229 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure
,
2230 Srun_hook_with_args_until_failure
, 1, MANY
, 0,
2231 "Run HOOK with the specified arguments ARGS.\n\
2232 HOOK should be a symbol, a hook variable. Its value should\n\
2233 be a list of functions. We call those functions, one by one,\n\
2234 passing arguments ARGS to each of them, until one of them\n\
2235 returns nil. Then we return nil.\n\
2236 If all the functions return non-nil, we return non-nil.\n\
2238 To make a hook variable buffer-local, use `make-local-hook',\n\
2239 not `make-local-variable'.")
2244 return run_hook_with_args (nargs
, args
, until_failure
);
2247 /* ARGS[0] should be a hook symbol.
2248 Call each of the functions in the hook value, passing each of them
2249 as arguments all the rest of ARGS (all NARGS - 1 elements).
2250 COND specifies a condition to test after each call
2251 to decide whether to stop.
2252 The caller (or its caller, etc) must gcpro all of ARGS,
2253 except that it isn't necessary to gcpro ARGS[0]. */
2256 run_hook_with_args (nargs
, args
, cond
)
2259 enum run_hooks_condition cond
;
2261 Lisp_Object sym
, val
, ret
;
2262 Lisp_Object globals
;
2263 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2265 /* If we are dying or still initializing,
2266 don't do anything--it would probably crash if we tried. */
2267 if (NILP (Vrun_hooks
))
2271 val
= find_symbol_value (sym
);
2272 ret
= (cond
== until_failure
? Qt
: Qnil
);
2274 if (EQ (val
, Qunbound
) || NILP (val
))
2276 else if (!CONSP (val
) || EQ (XCAR (val
), Qlambda
))
2279 return Ffuncall (nargs
, args
);
2284 GCPRO3 (sym
, val
, globals
);
2287 CONSP (val
) && ((cond
== to_completion
)
2288 || (cond
== until_success
? NILP (ret
)
2292 if (EQ (XCAR (val
), Qt
))
2294 /* t indicates this hook has a local binding;
2295 it means to run the global binding too. */
2297 for (globals
= Fdefault_value (sym
);
2298 CONSP (globals
) && ((cond
== to_completion
)
2299 || (cond
== until_success
? NILP (ret
)
2301 globals
= XCDR (globals
))
2303 args
[0] = XCAR (globals
);
2304 /* In a global value, t should not occur. If it does, we
2305 must ignore it to avoid an endless loop. */
2306 if (!EQ (args
[0], Qt
))
2307 ret
= Ffuncall (nargs
, args
);
2312 args
[0] = XCAR (val
);
2313 ret
= Ffuncall (nargs
, args
);
2322 /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual
2323 present value of that symbol.
2324 Call each element of FUNLIST,
2325 passing each of them the rest of ARGS.
2326 The caller (or its caller, etc) must gcpro all of ARGS,
2327 except that it isn't necessary to gcpro ARGS[0]. */
2330 run_hook_list_with_args (funlist
, nargs
, args
)
2331 Lisp_Object funlist
;
2337 Lisp_Object globals
;
2338 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2342 GCPRO3 (sym
, val
, globals
);
2344 for (val
= funlist
; CONSP (val
); val
= XCDR (val
))
2346 if (EQ (XCAR (val
), Qt
))
2348 /* t indicates this hook has a local binding;
2349 it means to run the global binding too. */
2351 for (globals
= Fdefault_value (sym
);
2353 globals
= XCDR (globals
))
2355 args
[0] = XCAR (globals
);
2356 /* In a global value, t should not occur. If it does, we
2357 must ignore it to avoid an endless loop. */
2358 if (!EQ (args
[0], Qt
))
2359 Ffuncall (nargs
, args
);
2364 args
[0] = XCAR (val
);
2365 Ffuncall (nargs
, args
);
2372 /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
2375 run_hook_with_args_2 (hook
, arg1
, arg2
)
2376 Lisp_Object hook
, arg1
, arg2
;
2378 Lisp_Object temp
[3];
2383 Frun_hook_with_args (3, temp
);
2386 /* Apply fn to arg */
2389 Lisp_Object fn
, arg
;
2391 struct gcpro gcpro1
;
2395 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2399 Lisp_Object args
[2];
2403 RETURN_UNGCPRO (Fapply (2, args
));
2405 #else /* not NO_ARG_ARRAY */
2406 RETURN_UNGCPRO (Fapply (2, &fn
));
2407 #endif /* not NO_ARG_ARRAY */
2410 /* Call function fn on no arguments */
2415 struct gcpro gcpro1
;
2418 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2421 /* Call function fn with 1 argument arg1 */
2425 Lisp_Object fn
, arg1
;
2427 struct gcpro gcpro1
;
2429 Lisp_Object args
[2];
2435 RETURN_UNGCPRO (Ffuncall (2, args
));
2436 #else /* not NO_ARG_ARRAY */
2439 RETURN_UNGCPRO (Ffuncall (2, &fn
));
2440 #endif /* not NO_ARG_ARRAY */
2443 /* Call function fn with 2 arguments arg1, arg2 */
2446 call2 (fn
, arg1
, arg2
)
2447 Lisp_Object fn
, arg1
, arg2
;
2449 struct gcpro gcpro1
;
2451 Lisp_Object args
[3];
2457 RETURN_UNGCPRO (Ffuncall (3, args
));
2458 #else /* not NO_ARG_ARRAY */
2461 RETURN_UNGCPRO (Ffuncall (3, &fn
));
2462 #endif /* not NO_ARG_ARRAY */
2465 /* Call function fn with 3 arguments arg1, arg2, arg3 */
2468 call3 (fn
, arg1
, arg2
, arg3
)
2469 Lisp_Object fn
, arg1
, arg2
, arg3
;
2471 struct gcpro gcpro1
;
2473 Lisp_Object args
[4];
2480 RETURN_UNGCPRO (Ffuncall (4, args
));
2481 #else /* not NO_ARG_ARRAY */
2484 RETURN_UNGCPRO (Ffuncall (4, &fn
));
2485 #endif /* not NO_ARG_ARRAY */
2488 /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */
2491 call4 (fn
, arg1
, arg2
, arg3
, arg4
)
2492 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
;
2494 struct gcpro gcpro1
;
2496 Lisp_Object args
[5];
2504 RETURN_UNGCPRO (Ffuncall (5, args
));
2505 #else /* not NO_ARG_ARRAY */
2508 RETURN_UNGCPRO (Ffuncall (5, &fn
));
2509 #endif /* not NO_ARG_ARRAY */
2512 /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */
2515 call5 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
)
2516 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
;
2518 struct gcpro gcpro1
;
2520 Lisp_Object args
[6];
2529 RETURN_UNGCPRO (Ffuncall (6, args
));
2530 #else /* not NO_ARG_ARRAY */
2533 RETURN_UNGCPRO (Ffuncall (6, &fn
));
2534 #endif /* not NO_ARG_ARRAY */
2537 /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */
2540 call6 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
)
2541 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
;
2543 struct gcpro gcpro1
;
2545 Lisp_Object args
[7];
2555 RETURN_UNGCPRO (Ffuncall (7, args
));
2556 #else /* not NO_ARG_ARRAY */
2559 RETURN_UNGCPRO (Ffuncall (7, &fn
));
2560 #endif /* not NO_ARG_ARRAY */
2563 DEFUN ("funcall", Ffuncall
, Sfuncall
, 1, MANY
, 0,
2564 "Call first argument as a function, passing remaining arguments to it.\n\
2565 Return the value that function returns.\n\
2566 Thus, (funcall 'cons 'x 'y) returns (x . y).")
2573 int numargs
= nargs
- 1;
2574 Lisp_Object lisp_numargs
;
2576 struct backtrace backtrace
;
2577 register Lisp_Object
*internal_args
;
2581 if (consing_since_gc
> gc_cons_threshold
)
2582 Fgarbage_collect ();
2584 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2586 if (max_lisp_eval_depth
< 100)
2587 max_lisp_eval_depth
= 100;
2588 if (lisp_eval_depth
> max_lisp_eval_depth
)
2589 error ("Lisp nesting exceeds max-lisp-eval-depth");
2592 backtrace
.next
= backtrace_list
;
2593 backtrace_list
= &backtrace
;
2594 backtrace
.function
= &args
[0];
2595 backtrace
.args
= &args
[1];
2596 backtrace
.nargs
= nargs
- 1;
2597 backtrace
.evalargs
= 0;
2598 backtrace
.debug_on_exit
= 0;
2600 if (debug_on_next_call
)
2601 do_debug_on_call (Qlambda
);
2607 fun
= Findirect_function (fun
);
2611 if (numargs
< XSUBR (fun
)->min_args
2612 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2614 XSETFASTINT (lisp_numargs
, numargs
);
2615 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (lisp_numargs
, Qnil
)));
2618 if (XSUBR (fun
)->max_args
== UNEVALLED
)
2619 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2621 if (XSUBR (fun
)->max_args
== MANY
)
2623 val
= (*XSUBR (fun
)->function
) (numargs
, args
+ 1);
2627 if (XSUBR (fun
)->max_args
> numargs
)
2629 internal_args
= (Lisp_Object
*) alloca (XSUBR (fun
)->max_args
* sizeof (Lisp_Object
));
2630 bcopy (args
+ 1, internal_args
, numargs
* sizeof (Lisp_Object
));
2631 for (i
= numargs
; i
< XSUBR (fun
)->max_args
; i
++)
2632 internal_args
[i
] = Qnil
;
2635 internal_args
= args
+ 1;
2636 switch (XSUBR (fun
)->max_args
)
2639 val
= (*XSUBR (fun
)->function
) ();
2642 val
= (*XSUBR (fun
)->function
) (internal_args
[0]);
2645 val
= (*XSUBR (fun
)->function
) (internal_args
[0],
2649 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2653 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2658 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2659 internal_args
[2], internal_args
[3],
2663 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2664 internal_args
[2], internal_args
[3],
2665 internal_args
[4], internal_args
[5]);
2668 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2669 internal_args
[2], internal_args
[3],
2670 internal_args
[4], internal_args
[5],
2675 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2676 internal_args
[2], internal_args
[3],
2677 internal_args
[4], internal_args
[5],
2678 internal_args
[6], internal_args
[7]);
2683 /* If a subr takes more than 8 arguments without using MANY
2684 or UNEVALLED, we need to extend this function to support it.
2685 Until this is done, there is no way to call the function. */
2689 if (COMPILEDP (fun
))
2690 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2694 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2695 funcar
= Fcar (fun
);
2696 if (!SYMBOLP (funcar
))
2697 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2698 if (EQ (funcar
, Qlambda
))
2699 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2700 else if (EQ (funcar
, Qmocklisp
))
2701 val
= ml_apply (fun
, Flist (numargs
, args
+ 1));
2702 else if (EQ (funcar
, Qautoload
))
2704 do_autoload (fun
, args
[0]);
2708 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2712 if (backtrace
.debug_on_exit
)
2713 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
2714 backtrace_list
= backtrace
.next
;
2719 apply_lambda (fun
, args
, eval_flag
)
2720 Lisp_Object fun
, args
;
2723 Lisp_Object args_left
;
2724 Lisp_Object numargs
;
2725 register Lisp_Object
*arg_vector
;
2726 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2728 register Lisp_Object tem
;
2730 numargs
= Flength (args
);
2731 arg_vector
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
2734 GCPRO3 (*arg_vector
, args_left
, fun
);
2737 for (i
= 0; i
< XINT (numargs
);)
2739 tem
= Fcar (args_left
), args_left
= Fcdr (args_left
);
2740 if (eval_flag
) tem
= Feval (tem
);
2741 arg_vector
[i
++] = tem
;
2749 backtrace_list
->args
= arg_vector
;
2750 backtrace_list
->nargs
= i
;
2752 backtrace_list
->evalargs
= 0;
2753 tem
= funcall_lambda (fun
, XINT (numargs
), arg_vector
);
2755 /* Do the debug-on-exit now, while arg_vector still exists. */
2756 if (backtrace_list
->debug_on_exit
)
2757 tem
= call_debugger (Fcons (Qexit
, Fcons (tem
, Qnil
)));
2758 /* Don't do it again when we return to eval. */
2759 backtrace_list
->debug_on_exit
= 0;
2763 /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
2764 and return the result of evaluation.
2765 FUN must be either a lambda-expression or a compiled-code object. */
2768 funcall_lambda (fun
, nargs
, arg_vector
)
2771 register Lisp_Object
*arg_vector
;
2773 Lisp_Object val
, syms_left
, next
;
2774 int count
= specpdl_ptr
- specpdl
;
2775 int i
, optional
, rest
;
2777 if (NILP (Vmocklisp_arguments
))
2778 specbind (Qmocklisp_arguments
, Qt
); /* t means NOT mocklisp! */
2782 syms_left
= XCDR (fun
);
2783 if (CONSP (syms_left
))
2784 syms_left
= XCAR (syms_left
);
2786 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2788 else if (COMPILEDP (fun
))
2789 syms_left
= XVECTOR (fun
)->contents
[COMPILED_ARGLIST
];
2793 i
= optional
= rest
= 0;
2794 for (; CONSP (syms_left
); syms_left
= XCDR (syms_left
))
2798 next
= XCAR (syms_left
);
2799 while (!SYMBOLP (next
))
2800 next
= Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2802 if (EQ (next
, Qand_rest
))
2804 else if (EQ (next
, Qand_optional
))
2808 specbind (next
, Flist (nargs
- i
, &arg_vector
[i
]));
2812 specbind (next
, arg_vector
[i
++]);
2814 return Fsignal (Qwrong_number_of_arguments
,
2815 Fcons (fun
, Fcons (make_number (nargs
), Qnil
)));
2817 specbind (next
, Qnil
);
2820 if (!NILP (syms_left
))
2821 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2823 return Fsignal (Qwrong_number_of_arguments
,
2824 Fcons (fun
, Fcons (make_number (nargs
), Qnil
)));
2827 val
= Fprogn (XCDR (XCDR (fun
)));
2830 /* If we have not actually read the bytecode string
2831 and constants vector yet, fetch them from the file. */
2832 if (CONSP (XVECTOR (fun
)->contents
[COMPILED_BYTECODE
]))
2833 Ffetch_bytecode (fun
);
2834 val
= Fbyte_code (XVECTOR (fun
)->contents
[COMPILED_BYTECODE
],
2835 XVECTOR (fun
)->contents
[COMPILED_CONSTANTS
],
2836 XVECTOR (fun
)->contents
[COMPILED_STACK_DEPTH
]);
2839 return unbind_to (count
, val
);
2842 DEFUN ("fetch-bytecode", Ffetch_bytecode
, Sfetch_bytecode
,
2844 "If byte-compiled OBJECT is lazy-loaded, fetch it now.")
2850 if (COMPILEDP (object
)
2851 && CONSP (XVECTOR (object
)->contents
[COMPILED_BYTECODE
]))
2853 tem
= read_doc_string (XVECTOR (object
)->contents
[COMPILED_BYTECODE
]);
2855 error ("invalid byte code");
2856 XVECTOR (object
)->contents
[COMPILED_BYTECODE
] = XCAR (tem
);
2857 XVECTOR (object
)->contents
[COMPILED_CONSTANTS
] = XCDR (tem
);
2865 register int count
= specpdl_ptr
- specpdl
;
2866 if (specpdl_size
>= max_specpdl_size
)
2868 if (max_specpdl_size
< 400)
2869 max_specpdl_size
= 400;
2870 if (specpdl_size
>= max_specpdl_size
)
2872 if (!NILP (Vdebug_on_error
))
2873 /* Leave room for some specpdl in the debugger. */
2874 max_specpdl_size
= specpdl_size
+ 100;
2876 Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil
));
2880 if (specpdl_size
> max_specpdl_size
)
2881 specpdl_size
= max_specpdl_size
;
2882 specpdl
= (struct specbinding
*) xrealloc (specpdl
, specpdl_size
* sizeof (struct specbinding
));
2883 specpdl_ptr
= specpdl
+ count
;
2887 specbind (symbol
, value
)
2888 Lisp_Object symbol
, value
;
2892 CHECK_SYMBOL (symbol
, 0);
2893 if (specpdl_ptr
== specpdl
+ specpdl_size
)
2896 /* The most common case is that a non-constant symbol with a trivial
2897 value. Make that as fast as we can. */
2898 if (!MISCP (XSYMBOL (symbol
)->value
)
2899 && !EQ (symbol
, Qnil
)
2901 && !(XSYMBOL (symbol
)->name
->data
[0] == ':'
2902 && EQ (XSYMBOL (symbol
)->obarray
, initial_obarray
)
2903 && !EQ (value
, symbol
)))
2905 specpdl_ptr
->symbol
= symbol
;
2906 specpdl_ptr
->old_value
= XSYMBOL (symbol
)->value
;
2907 specpdl_ptr
->func
= NULL
;
2909 XSYMBOL (symbol
)->value
= value
;
2913 ovalue
= find_symbol_value (symbol
);
2914 specpdl_ptr
->func
= 0;
2915 specpdl_ptr
->old_value
= ovalue
;
2917 if (BUFFER_LOCAL_VALUEP (XSYMBOL (symbol
)->value
)
2918 || SOME_BUFFER_LOCAL_VALUEP (XSYMBOL (symbol
)->value
)
2919 || BUFFER_OBJFWDP (XSYMBOL (symbol
)->value
))
2921 Lisp_Object current_buffer
, binding_buffer
;
2923 /* For a local variable, record both the symbol and which
2924 buffer's value we are saving. */
2925 current_buffer
= Fcurrent_buffer ();
2926 binding_buffer
= current_buffer
;
2928 /* If the variable is not local in this buffer,
2929 we are saving the global value, so restore that. */
2930 if (NILP (Flocal_variable_p (symbol
, binding_buffer
)))
2931 binding_buffer
= Qnil
;
2933 = Fcons (symbol
, Fcons (binding_buffer
, current_buffer
));
2935 /* If SYMBOL is a per-buffer variable which doesn't have a
2936 buffer-local value here, make the `let' change the global
2937 value by changing the value of SYMBOL in all buffers not
2938 having their own value. This is consistent with what
2939 happens with other buffer-local variables. */
2940 if (NILP (binding_buffer
)
2941 && BUFFER_OBJFWDP (XSYMBOL (symbol
)->value
))
2944 Fset_default (symbol
, value
);
2949 specpdl_ptr
->symbol
= symbol
;
2952 if (BUFFER_OBJFWDP (ovalue
) || KBOARD_OBJFWDP (ovalue
))
2953 store_symval_forwarding (symbol
, ovalue
, value
);
2955 set_internal (symbol
, value
, 0, 1);
2960 record_unwind_protect (function
, arg
)
2961 Lisp_Object (*function
) P_ ((Lisp_Object
));
2964 if (specpdl_ptr
== specpdl
+ specpdl_size
)
2966 specpdl_ptr
->func
= function
;
2967 specpdl_ptr
->symbol
= Qnil
;
2968 specpdl_ptr
->old_value
= arg
;
2973 unbind_to (count
, value
)
2977 int quitf
= !NILP (Vquit_flag
);
2978 struct gcpro gcpro1
;
2983 while (specpdl_ptr
!= specpdl
+ count
)
2987 if (specpdl_ptr
->func
!= 0)
2988 (*specpdl_ptr
->func
) (specpdl_ptr
->old_value
);
2989 /* Note that a "binding" of nil is really an unwind protect,
2990 so in that case the "old value" is a list of forms to evaluate. */
2991 else if (NILP (specpdl_ptr
->symbol
))
2992 Fprogn (specpdl_ptr
->old_value
);
2993 /* If the symbol is a list, it is really
2994 (SYMBOL BINDING_BUFFER . CURRENT_BUFFER)
2995 and it indicates we bound a variable that has
2996 buffer-local bindings. */
2997 else if (CONSP (specpdl_ptr
->symbol
))
2999 Lisp_Object symbol
, buffer
;
3001 symbol
= XCAR (specpdl_ptr
->symbol
);
3002 buffer
= XCAR (XCDR (specpdl_ptr
->symbol
));
3004 /* Handle restoring a default value. */
3006 Fset_default (symbol
, specpdl_ptr
->old_value
);
3007 /* Handle restoring a value saved from a live buffer. */
3009 set_internal (symbol
, specpdl_ptr
->old_value
, XBUFFER (buffer
), 1);
3013 /* If variable has a trivial value (no forwarding), we can
3014 just set it. No need to check for constant symbols here,
3015 since that was already done by specbind. */
3016 if (!MISCP (XSYMBOL (specpdl_ptr
->symbol
)->value
))
3017 XSYMBOL (specpdl_ptr
->symbol
)->value
= specpdl_ptr
->old_value
;
3019 set_internal (specpdl_ptr
->symbol
, specpdl_ptr
->old_value
, 0, 1);
3023 if (NILP (Vquit_flag
) && quitf
)
3032 /* Get the value of symbol's global binding, even if that binding
3033 is not now dynamically visible. */
3036 top_level_value (symbol
)
3039 register struct specbinding
*ptr
= specpdl
;
3041 CHECK_SYMBOL (symbol
, 0);
3042 for (; ptr
!= specpdl_ptr
; ptr
++)
3044 if (EQ (ptr
->symbol
, symbol
))
3045 return ptr
->old_value
;
3047 return Fsymbol_value (symbol
);
3051 top_level_set (symbol
, newval
)
3052 Lisp_Object symbol
, newval
;
3054 register struct specbinding
*ptr
= specpdl
;
3056 CHECK_SYMBOL (symbol
, 0);
3057 for (; ptr
!= specpdl_ptr
; ptr
++)
3059 if (EQ (ptr
->symbol
, symbol
))
3061 ptr
->old_value
= newval
;
3065 return Fset (symbol
, newval
);
3070 DEFUN ("backtrace-debug", Fbacktrace_debug
, Sbacktrace_debug
, 2, 2, 0,
3071 "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\
3072 The debugger is entered when that frame exits, if the flag is non-nil.")
3074 Lisp_Object level
, flag
;
3076 register struct backtrace
*backlist
= backtrace_list
;
3079 CHECK_NUMBER (level
, 0);
3081 for (i
= 0; backlist
&& i
< XINT (level
); i
++)
3083 backlist
= backlist
->next
;
3087 backlist
->debug_on_exit
= !NILP (flag
);
3092 DEFUN ("backtrace", Fbacktrace
, Sbacktrace
, 0, 0, "",
3093 "Print a trace of Lisp function calls currently active.\n\
3094 Output stream used is value of `standard-output'.")
3097 register struct backtrace
*backlist
= backtrace_list
;
3101 extern Lisp_Object Vprint_level
;
3102 struct gcpro gcpro1
;
3104 XSETFASTINT (Vprint_level
, 3);
3111 write_string (backlist
->debug_on_exit
? "* " : " ", 2);
3112 if (backlist
->nargs
== UNEVALLED
)
3114 Fprin1 (Fcons (*backlist
->function
, *backlist
->args
), Qnil
);
3115 write_string ("\n", -1);
3119 tem
= *backlist
->function
;
3120 Fprin1 (tem
, Qnil
); /* This can QUIT */
3121 write_string ("(", -1);
3122 if (backlist
->nargs
== MANY
)
3124 for (tail
= *backlist
->args
, i
= 0;
3126 tail
= Fcdr (tail
), i
++)
3128 if (i
) write_string (" ", -1);
3129 Fprin1 (Fcar (tail
), Qnil
);
3134 for (i
= 0; i
< backlist
->nargs
; i
++)
3136 if (i
) write_string (" ", -1);
3137 Fprin1 (backlist
->args
[i
], Qnil
);
3140 write_string (")\n", -1);
3142 backlist
= backlist
->next
;
3145 Vprint_level
= Qnil
;
3150 DEFUN ("backtrace-frame", Fbacktrace_frame
, Sbacktrace_frame
, 1, 1, NULL
,
3151 "Return the function and arguments NFRAMES up from current execution point.\n\
3152 If that frame has not evaluated the arguments yet (or is a special form),\n\
3153 the value is (nil FUNCTION ARG-FORMS...).\n\
3154 If that frame has evaluated its arguments and called its function already,\n\
3155 the value is (t FUNCTION ARG-VALUES...).\n\
3156 A &rest arg is represented as the tail of the list ARG-VALUES.\n\
3157 FUNCTION is whatever was supplied as car of evaluated list,\n\
3158 or a lambda expression for macro calls.\n\
3159 If NFRAMES is more than the number of frames, the value is nil.")
3161 Lisp_Object nframes
;
3163 register struct backtrace
*backlist
= backtrace_list
;
3167 CHECK_NATNUM (nframes
, 0);
3169 /* Find the frame requested. */
3170 for (i
= 0; backlist
&& i
< XFASTINT (nframes
); i
++)
3171 backlist
= backlist
->next
;
3175 if (backlist
->nargs
== UNEVALLED
)
3176 return Fcons (Qnil
, Fcons (*backlist
->function
, *backlist
->args
));
3179 if (backlist
->nargs
== MANY
)
3180 tem
= *backlist
->args
;
3182 tem
= Flist (backlist
->nargs
, backlist
->args
);
3184 return Fcons (Qt
, Fcons (*backlist
->function
, tem
));
3192 DEFVAR_INT ("max-specpdl-size", &max_specpdl_size
,
3193 "*Limit on number of Lisp variable bindings & unwind-protects.\n\
3194 If Lisp code tries to make more than this many at once,\n\
3195 an error is signaled.");
3197 DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth
,
3198 "*Limit on depth in `eval', `apply' and `funcall' before error.\n\
3199 This limit is to catch infinite recursions for you before they cause\n\
3200 actual stack overflow in C, which would be fatal for Emacs.\n\
3201 You can safely make it considerably larger than its default value,\n\
3202 if that proves inconveniently small.");
3204 DEFVAR_LISP ("quit-flag", &Vquit_flag
,
3205 "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\
3206 Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'.");
3209 DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit
,
3210 "Non-nil inhibits C-g quitting from happening immediately.\n\
3211 Note that `quit-flag' will still be set by typing C-g,\n\
3212 so a quit will be signaled as soon as `inhibit-quit' is nil.\n\
3213 To prevent this happening, set `quit-flag' to nil\n\
3214 before making `inhibit-quit' nil.");
3215 Vinhibit_quit
= Qnil
;
3217 Qinhibit_quit
= intern ("inhibit-quit");
3218 staticpro (&Qinhibit_quit
);
3220 Qautoload
= intern ("autoload");
3221 staticpro (&Qautoload
);
3223 Qdebug_on_error
= intern ("debug-on-error");
3224 staticpro (&Qdebug_on_error
);
3226 Qmacro
= intern ("macro");
3227 staticpro (&Qmacro
);
3229 /* Note that the process handling also uses Qexit, but we don't want
3230 to staticpro it twice, so we just do it here. */
3231 Qexit
= intern ("exit");
3234 Qinteractive
= intern ("interactive");
3235 staticpro (&Qinteractive
);
3237 Qcommandp
= intern ("commandp");
3238 staticpro (&Qcommandp
);
3240 Qdefun
= intern ("defun");
3241 staticpro (&Qdefun
);
3243 Qand_rest
= intern ("&rest");
3244 staticpro (&Qand_rest
);
3246 Qand_optional
= intern ("&optional");
3247 staticpro (&Qand_optional
);
3249 DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error
,
3250 "*Non-nil means automatically display a backtrace buffer\n\
3251 after any error that is handled by the editor command loop.\n\
3252 If the value is a list, an error only means to display a backtrace\n\
3253 if one of its condition symbols appears in the list.");
3254 Vstack_trace_on_error
= Qnil
;
3256 DEFVAR_LISP ("debug-on-error", &Vdebug_on_error
,
3257 "*Non-nil means enter debugger if an error is signaled.\n\
3258 Does not apply to errors handled by `condition-case'.\n\
3259 If the value is a list, an error only means to enter the debugger\n\
3260 if one of its condition symbols appears in the list.\n\
3261 See also variable `debug-on-quit'.");
3262 Vdebug_on_error
= Qnil
;
3264 DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors
,
3265 "*List of errors for which the debugger should not be called.\n\
3266 Each element may be a condition-name or a regexp that matches error messages.\n\
3267 If any element applies to a given error, that error skips the debugger\n\
3268 and just returns to top level.\n\
3269 This overrides the variable `debug-on-error'.\n\
3270 It does not apply to errors handled by `condition-case'.");
3271 Vdebug_ignored_errors
= Qnil
;
3273 DEFVAR_BOOL ("debug-on-quit", &debug_on_quit
,
3274 "*Non-nil means enter debugger if quit is signaled (C-g, for example).\n\
3275 Does not apply if quit is handled by a `condition-case'.");
3278 DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call
,
3279 "Non-nil means enter debugger before next `eval', `apply' or `funcall'.");
3281 DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue
,
3282 "Non-nil means debugger may continue execution.\n\
3283 This is nil when the debugger is called under circumstances where it\n\
3284 might not be safe to continue.");
3285 debugger_may_continue
= 1;
3287 DEFVAR_LISP ("debugger", &Vdebugger
,
3288 "Function to call to invoke debugger.\n\
3289 If due to frame exit, args are `exit' and the value being returned;\n\
3290 this function's value will be returned instead of that.\n\
3291 If due to error, args are `error' and a list of the args to `signal'.\n\
3292 If due to `apply' or `funcall' entry, one arg, `lambda'.\n\
3293 If due to `eval' entry, one arg, t.");
3296 DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function
,
3297 "If non-nil, this is a function for `signal' to call.\n\
3298 It receives the same arguments that `signal' was given.\n\
3299 The Edebug package uses this to regain control.");
3300 Vsignal_hook_function
= Qnil
;
3302 Qmocklisp_arguments
= intern ("mocklisp-arguments");
3303 staticpro (&Qmocklisp_arguments
);
3304 DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments
,
3305 "While in a mocklisp function, the list of its unevaluated args.");
3306 Vmocklisp_arguments
= Qt
;
3308 DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal
,
3309 "*Non-nil means call the debugger regardless of condition handlers.\n\
3310 Note that `debug-on-error', `debug-on-quit' and friends\n\
3311 still determine whether to handle the particular condition.");
3312 Vdebug_on_signal
= Qnil
;
3314 Vrun_hooks
= intern ("run-hooks");
3315 staticpro (&Vrun_hooks
);
3317 staticpro (&Vautoload_queue
);
3318 Vautoload_queue
= Qnil
;
3319 staticpro (&Vsignaling_function
);
3320 Vsignaling_function
= Qnil
;
3331 defsubr (&Sfunction
);
3333 defsubr (&Sdefmacro
);
3335 defsubr (&Sdefconst
);
3336 defsubr (&Suser_variable_p
);
3340 defsubr (&Smacroexpand
);
3343 defsubr (&Sunwind_protect
);
3344 defsubr (&Scondition_case
);
3346 defsubr (&Sinteractive_p
);
3347 defsubr (&Scommandp
);
3348 defsubr (&Sautoload
);
3351 defsubr (&Sfuncall
);
3352 defsubr (&Srun_hooks
);
3353 defsubr (&Srun_hook_with_args
);
3354 defsubr (&Srun_hook_with_args_until_success
);
3355 defsubr (&Srun_hook_with_args_until_failure
);
3356 defsubr (&Sfetch_bytecode
);
3357 defsubr (&Sbacktrace_debug
);
3358 defsubr (&Sbacktrace
);
3359 defsubr (&Sbacktrace_frame
);