1 /* Evaluator for GNU Emacs Lisp interpreter.
2 Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
29 #include "blockinput.h"
40 /* This definition is duplicated in alloc.c and keyboard.c */
41 /* Putting it in lisp.h makes cc bomb out! */
45 struct backtrace
*next
;
46 Lisp_Object
*function
;
47 Lisp_Object
*args
; /* Points to vector of args. */
48 int nargs
; /* Length of vector.
49 If nargs is UNEVALLED, args points to slot holding
50 list of unevalled args */
52 /* Nonzero means call value of debugger when done with this operation. */
56 struct backtrace
*backtrace_list
;
58 /* This structure helps implement the `catch' and `throw' control
59 structure. A struct catchtag contains all the information needed
60 to restore the state of the interpreter after a non-local jump.
62 Handlers for error conditions (represented by `struct handler'
63 structures) just point to a catch tag to do the cleanup required
66 catchtag structures are chained together in the C calling stack;
67 the `next' member points to the next outer catchtag.
69 A call like (throw TAG VAL) searches for a catchtag whose `tag'
70 member is TAG, and then unbinds to it. The `val' member is used to
71 hold VAL while the stack is unwound; `val' is returned as the value
74 All the other members are concerned with restoring the interpreter
80 struct catchtag
*next
;
83 struct backtrace
*backlist
;
84 struct handler
*handlerlist
;
87 int poll_suppress_count
;
90 struct catchtag
*catchlist
;
92 Lisp_Object Qautoload
, Qmacro
, Qexit
, Qinteractive
, Qcommandp
, Qdefun
;
93 Lisp_Object Qinhibit_quit
, Vinhibit_quit
, Vquit_flag
;
94 Lisp_Object Qmocklisp_arguments
, Vmocklisp_arguments
, Qmocklisp
;
95 Lisp_Object Qand_rest
, Qand_optional
;
96 Lisp_Object Qdebug_on_error
;
98 /* This holds either the symbol `run-hooks' or nil.
99 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. */
113 /* Pointer to beginning of specpdl. */
114 struct specbinding
*specpdl
;
116 /* Pointer to first unused element in specpdl. */
117 struct specbinding
*specpdl_ptr
;
119 /* Maximum size allowed for specpdl allocation */
120 int max_specpdl_size
;
122 /* Depth in Lisp evaluations and function calls. */
125 /* Maximum allowed depth in Lisp evaluations and function calls. */
126 int max_lisp_eval_depth
;
128 /* Nonzero means enter debugger before next function call */
129 int debug_on_next_call
;
131 /* List of conditions (non-nil atom means all) which cause a backtrace
132 if an error is handled by the command loop's error handler. */
133 Lisp_Object Vstack_trace_on_error
;
135 /* List of conditions (non-nil atom means all) which enter the debugger
136 if an error is handled by the command loop's error handler. */
137 Lisp_Object Vdebug_on_error
;
139 /* List of conditions and regexps specifying error messages which
140 do not enter the debugger even if Vdebug_on_errors says they should. */
141 Lisp_Object Vdebug_ignored_errors
;
143 /* Non-nil means call the debugger even if the error will be handled. */
144 Lisp_Object Vdebug_on_signal
;
146 /* Hook for edebug to use. */
147 Lisp_Object Vsignal_hook_function
;
149 /* Nonzero means enter debugger if a quit signal
150 is handled by the command loop's error handler. */
153 /* The value of num_nonmacro_input_events as of the last time we
154 started to enter the debugger. If we decide to enter the debugger
155 again when this is still equal to num_nonmacro_input_events, then we
156 know that the debugger itself has an error, and we should just
157 signal the error instead of entering an infinite loop of debugger
159 int when_entered_debugger
;
161 Lisp_Object Vdebugger
;
163 void specbind (), record_unwind_protect ();
165 Lisp_Object
run_hook_with_args ();
167 Lisp_Object
funcall_lambda ();
168 extern Lisp_Object
ml_apply (); /* Apply a mocklisp function to unevaluated argument list */
174 specpdl
= (struct specbinding
*) xmalloc (specpdl_size
* sizeof (struct specbinding
));
175 specpdl_ptr
= specpdl
;
176 max_specpdl_size
= 600;
177 max_lisp_eval_depth
= 300;
185 specpdl_ptr
= specpdl
;
190 debug_on_next_call
= 0;
192 /* This is less than the initial value of num_nonmacro_input_events. */
193 when_entered_debugger
= -1;
200 if (lisp_eval_depth
+ 20 > max_lisp_eval_depth
)
201 max_lisp_eval_depth
= lisp_eval_depth
+ 20;
202 if (specpdl_size
+ 40 > max_specpdl_size
)
203 max_specpdl_size
= specpdl_size
+ 40;
204 debug_on_next_call
= 0;
205 when_entered_debugger
= num_nonmacro_input_events
;
206 return apply1 (Vdebugger
, arg
);
210 do_debug_on_call (code
)
213 debug_on_next_call
= 0;
214 backtrace_list
->debug_on_exit
= 1;
215 call_debugger (Fcons (code
, Qnil
));
218 /* NOTE!!! Every function that can call EVAL must protect its args
219 and temporaries from garbage collection while it needs them.
220 The definition of `For' shows what you have to do. */
222 DEFUN ("or", For
, Sor
, 0, UNEVALLED
, 0,
223 "Eval args until one of them yields non-nil, then return that value.\n\
224 The remaining args are not evalled at all.\n\
225 If all args return nil, return nil.")
229 register Lisp_Object val
;
230 Lisp_Object args_left
;
241 val
= Feval (Fcar (args_left
));
244 args_left
= Fcdr (args_left
);
246 while (!NILP(args_left
));
252 DEFUN ("and", Fand
, Sand
, 0, UNEVALLED
, 0,
253 "Eval args until one of them yields nil, then return nil.\n\
254 The remaining args are not evalled at all.\n\
255 If no arg yields nil, return the last arg's value.")
259 register Lisp_Object val
;
260 Lisp_Object args_left
;
271 val
= Feval (Fcar (args_left
));
274 args_left
= Fcdr (args_left
);
276 while (!NILP(args_left
));
282 DEFUN ("if", Fif
, Sif
, 2, UNEVALLED
, 0,
283 "(if COND THEN ELSE...): if COND yields non-nil, do THEN, else do ELSE...\n\
284 Returns the value of THEN or the value of the last of the ELSE's.\n\
285 THEN must be one expression, but ELSE... can be zero or more expressions.\n\
286 If COND yields nil, and there are no ELSE's, the value is nil.")
290 register Lisp_Object cond
;
294 cond
= Feval (Fcar (args
));
298 return Feval (Fcar (Fcdr (args
)));
299 return Fprogn (Fcdr (Fcdr (args
)));
302 DEFUN ("cond", Fcond
, Scond
, 0, UNEVALLED
, 0,
303 "(cond CLAUSES...): try each clause until one succeeds.\n\
304 Each clause looks like (CONDITION BODY...). CONDITION is evaluated\n\
305 and, if the value is non-nil, this clause succeeds:\n\
306 then the expressions in BODY are evaluated and the last one's\n\
307 value is the value of the cond-form.\n\
308 If no clause succeeds, cond returns nil.\n\
309 If a clause has one element, as in (CONDITION),\n\
310 CONDITION's value if non-nil is returned from the cond-form.")
314 register Lisp_Object clause
, val
;
321 clause
= Fcar (args
);
322 val
= Feval (Fcar (clause
));
325 if (!EQ (XCONS (clause
)->cdr
, Qnil
))
326 val
= Fprogn (XCONS (clause
)->cdr
);
329 args
= XCONS (args
)->cdr
;
336 DEFUN ("progn", Fprogn
, Sprogn
, 0, UNEVALLED
, 0,
337 "(progn BODY...): eval BODY forms sequentially and return value of last one.")
341 register Lisp_Object val
, tem
;
342 Lisp_Object args_left
;
345 /* In Mocklisp code, symbols at the front of the progn arglist
346 are to be bound to zero. */
347 if (!EQ (Vmocklisp_arguments
, Qt
))
349 val
= make_number (0);
350 while (!NILP (args
) && (tem
= Fcar (args
), SYMBOLP (tem
)))
353 specbind (tem
, val
), args
= Fcdr (args
);
365 val
= Feval (Fcar (args_left
));
366 args_left
= Fcdr (args_left
);
368 while (!NILP(args_left
));
374 DEFUN ("prog1", Fprog1
, Sprog1
, 1, UNEVALLED
, 0,
375 "(prog1 FIRST BODY...): eval FIRST and BODY sequentially; value from FIRST.\n\
376 The value of FIRST is saved during the evaluation of the remaining args,\n\
377 whose values are discarded.")
382 register Lisp_Object args_left
;
383 struct gcpro gcpro1
, gcpro2
;
384 register int argnum
= 0;
396 val
= Feval (Fcar (args_left
));
398 Feval (Fcar (args_left
));
399 args_left
= Fcdr (args_left
);
401 while (!NILP(args_left
));
407 DEFUN ("prog2", Fprog2
, Sprog2
, 2, UNEVALLED
, 0,
408 "(prog2 X Y BODY...): eval X, Y and BODY sequentially; value from Y.\n\
409 The value of Y is saved during the evaluation of the remaining args,\n\
410 whose values are discarded.")
415 register Lisp_Object args_left
;
416 struct gcpro gcpro1
, gcpro2
;
417 register int argnum
= -1;
431 val
= Feval (Fcar (args_left
));
433 Feval (Fcar (args_left
));
434 args_left
= Fcdr (args_left
);
436 while (!NILP (args_left
));
442 DEFUN ("setq", Fsetq
, Ssetq
, 0, UNEVALLED
, 0,
443 "(setq SYM VAL SYM VAL ...): set each SYM to the value of its VAL.\n\
444 The symbols SYM are variables; they are literal (not evaluated).\n\
445 The values VAL are expressions; they are evaluated.\n\
446 Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.\n\
447 The second VAL is not computed until after the first SYM is set, and so on;\n\
448 each VAL can use the new value of variables set earlier in the `setq'.\n\
449 The return value of the `setq' form is the value of the last VAL.")
453 register Lisp_Object args_left
;
454 register Lisp_Object val
, sym
;
465 val
= Feval (Fcar (Fcdr (args_left
)));
466 sym
= Fcar (args_left
);
468 args_left
= Fcdr (Fcdr (args_left
));
470 while (!NILP(args_left
));
476 DEFUN ("quote", Fquote
, Squote
, 1, UNEVALLED
, 0,
477 "Return the argument, without evaluating it. `(quote x)' yields `x'.")
484 DEFUN ("function", Ffunction
, Sfunction
, 1, UNEVALLED
, 0,
485 "Like `quote', but preferred for objects which are functions.\n\
486 In byte compilation, `function' causes its argument to be compiled.\n\
487 `quote' cannot do that.")
494 DEFUN ("interactive-p", Finteractive_p
, Sinteractive_p
, 0, 0, 0,
495 "Return t if function in which this appears was called interactively.\n\
496 This means that the function was called with call-interactively (which\n\
497 includes being called as the binding of a key)\n\
498 and input is currently coming from the keyboard (not in keyboard macro).")
501 register struct backtrace
*btp
;
502 register Lisp_Object fun
;
507 btp
= backtrace_list
;
509 /* If this isn't a byte-compiled function, there may be a frame at
510 the top for Finteractive_p itself. If so, skip it. */
511 fun
= Findirect_function (*btp
->function
);
512 if (SUBRP (fun
) && XSUBR (fun
) == &Sinteractive_p
)
515 /* If we're running an Emacs 18-style byte-compiled function, there
516 may be a frame for Fbytecode. Now, given the strictest
517 definition, this function isn't really being called
518 interactively, but because that's the way Emacs 18 always builds
519 byte-compiled functions, we'll accept it for now. */
520 if (EQ (*btp
->function
, Qbytecode
))
523 /* If this isn't a byte-compiled function, then we may now be
524 looking at several frames for special forms. Skip past them. */
526 btp
->nargs
== UNEVALLED
)
529 /* btp now points at the frame of the innermost function that isn't
530 a special form, ignoring frames for Finteractive_p and/or
531 Fbytecode at the top. If this frame is for a built-in function
532 (such as load or eval-region) return nil. */
533 fun
= Findirect_function (*btp
->function
);
536 /* btp points to the frame of a Lisp function that called interactive-p.
537 Return t if that function was called interactively. */
538 if (btp
&& btp
->next
&& EQ (*btp
->next
->function
, Qcall_interactively
))
543 DEFUN ("defun", Fdefun
, Sdefun
, 2, UNEVALLED
, 0,
544 "(defun NAME ARGLIST [DOCSTRING] BODY...): define NAME as a function.\n\
545 The definition is (lambda ARGLIST [DOCSTRING] BODY...).\n\
546 See also the function `interactive'.")
550 register Lisp_Object fn_name
;
551 register Lisp_Object defn
;
553 fn_name
= Fcar (args
);
554 defn
= Fcons (Qlambda
, Fcdr (args
));
555 if (!NILP (Vpurify_flag
))
556 defn
= Fpurecopy (defn
);
557 Ffset (fn_name
, defn
);
558 LOADHIST_ATTACH (fn_name
);
562 DEFUN ("defmacro", Fdefmacro
, Sdefmacro
, 2, UNEVALLED
, 0,
563 "(defmacro NAME ARGLIST [DOCSTRING] BODY...): define NAME as a macro.\n\
564 The definition is (macro lambda ARGLIST [DOCSTRING] BODY...).\n\
565 When the macro is called, as in (NAME ARGS...),\n\
566 the function (lambda ARGLIST BODY...) is applied to\n\
567 the list ARGS... as it appears in the expression,\n\
568 and the result should be a form to be evaluated instead of the original.")
572 register Lisp_Object fn_name
;
573 register Lisp_Object defn
;
575 fn_name
= Fcar (args
);
576 defn
= Fcons (Qmacro
, Fcons (Qlambda
, Fcdr (args
)));
577 if (!NILP (Vpurify_flag
))
578 defn
= Fpurecopy (defn
);
579 Ffset (fn_name
, defn
);
580 LOADHIST_ATTACH (fn_name
);
584 DEFUN ("defvar", Fdefvar
, Sdefvar
, 1, UNEVALLED
, 0,
585 "(defvar SYMBOL INITVALUE DOCSTRING): define SYMBOL as a variable.\n\
586 You are not required to define a variable in order to use it,\n\
587 but the definition can supply documentation and an initial value\n\
588 in a way that tags can recognize.\n\n\
589 INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.\n\
590 If SYMBOL is buffer-local, its default value is what is set;\n\
591 buffer-local values are not affected.\n\
592 INITVALUE and DOCSTRING are optional.\n\
593 If DOCSTRING starts with *, this variable is identified as a user option.\n\
594 This means that M-x set-variable and M-x edit-options recognize it.\n\
595 If INITVALUE is missing, SYMBOL's value is not set.")
599 register Lisp_Object sym
, tem
, tail
;
603 if (!NILP (Fcdr (Fcdr (tail
))))
604 error ("too many arguments");
608 tem
= Fdefault_boundp (sym
);
610 Fset_default (sym
, Feval (Fcar (Fcdr (args
))));
612 tail
= Fcdr (Fcdr (args
));
613 if (!NILP (Fcar (tail
)))
616 if (!NILP (Vpurify_flag
))
617 tem
= Fpurecopy (tem
);
618 Fput (sym
, Qvariable_documentation
, tem
);
620 LOADHIST_ATTACH (sym
);
624 DEFUN ("defconst", Fdefconst
, Sdefconst
, 2, UNEVALLED
, 0,
625 "(defconst SYMBOL INITVALUE DOCSTRING): define SYMBOL as a constant variable.\n\
626 The intent is that programs do not change this value, but users may.\n\
627 Always sets the value of SYMBOL to the result of evalling INITVALUE.\n\
628 If SYMBOL is buffer-local, its default value is what is set;\n\
629 buffer-local values are not affected.\n\
630 DOCSTRING is optional.\n\
631 If DOCSTRING starts with *, this variable is identified as a user option.\n\
632 This means that M-x set-variable and M-x edit-options recognize it.\n\n\
633 Note: do not use `defconst' for user options in libraries that are not\n\
634 normally loaded, since it is useful for users to be able to specify\n\
635 their own values for such variables before loading the library.\n\
636 Since `defconst' unconditionally assigns the variable,\n\
637 it would override the user's choice.")
641 register Lisp_Object sym
, tem
;
644 if (!NILP (Fcdr (Fcdr (Fcdr (args
)))))
645 error ("too many arguments");
647 Fset_default (sym
, Feval (Fcar (Fcdr (args
))));
648 tem
= Fcar (Fcdr (Fcdr (args
)));
651 if (!NILP (Vpurify_flag
))
652 tem
= Fpurecopy (tem
);
653 Fput (sym
, Qvariable_documentation
, tem
);
655 LOADHIST_ATTACH (sym
);
659 DEFUN ("user-variable-p", Fuser_variable_p
, Suser_variable_p
, 1, 1, 0,
660 "Returns t if VARIABLE is intended to be set and modified by users.\n\
661 \(The alternative is a variable used internally in a Lisp program.)\n\
662 Determined by whether the first character of the documentation\n\
663 for the variable is `*'.")
665 Lisp_Object variable
;
667 Lisp_Object documentation
;
669 if (!SYMBOLP (variable
))
672 documentation
= Fget (variable
, Qvariable_documentation
);
673 if (INTEGERP (documentation
) && XINT (documentation
) < 0)
675 if (STRINGP (documentation
)
676 && ((unsigned char) XSTRING (documentation
)->data
[0] == '*'))
678 /* If it is (STRING . INTEGER), a negative integer means a user variable. */
679 if (CONSP (documentation
)
680 && STRINGP (XCONS (documentation
)->car
)
681 && INTEGERP (XCONS (documentation
)->cdr
)
682 && XINT (XCONS (documentation
)->cdr
) < 0)
687 DEFUN ("let*", FletX
, SletX
, 1, UNEVALLED
, 0,
688 "(let* VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\
689 The value of the last form in BODY is returned.\n\
690 Each element of VARLIST is a symbol (which is bound to nil)\n\
691 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\
692 Each VALUEFORM can refer to the symbols already bound by this VARLIST.")
696 Lisp_Object varlist
, val
, elt
;
697 int count
= specpdl_ptr
- specpdl
;
698 struct gcpro gcpro1
, gcpro2
, gcpro3
;
700 GCPRO3 (args
, elt
, varlist
);
702 varlist
= Fcar (args
);
703 while (!NILP (varlist
))
706 elt
= Fcar (varlist
);
708 specbind (elt
, Qnil
);
709 else if (! NILP (Fcdr (Fcdr (elt
))))
711 Fcons (build_string ("`let' bindings can have only one value-form"),
715 val
= Feval (Fcar (Fcdr (elt
)));
716 specbind (Fcar (elt
), val
);
718 varlist
= Fcdr (varlist
);
721 val
= Fprogn (Fcdr (args
));
722 return unbind_to (count
, val
);
725 DEFUN ("let", Flet
, Slet
, 1, UNEVALLED
, 0,
726 "(let VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\
727 The value of the last form in BODY is returned.\n\
728 Each element of VARLIST is a symbol (which is bound to nil)\n\
729 or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\
730 All the VALUEFORMs are evalled before any symbols are bound.")
734 Lisp_Object
*temps
, tem
;
735 register Lisp_Object elt
, varlist
;
736 int count
= specpdl_ptr
- specpdl
;
738 struct gcpro gcpro1
, gcpro2
;
740 varlist
= Fcar (args
);
742 /* Make space to hold the values to give the bound variables */
743 elt
= Flength (varlist
);
744 temps
= (Lisp_Object
*) alloca (XFASTINT (elt
) * sizeof (Lisp_Object
));
746 /* Compute the values and store them in `temps' */
748 GCPRO2 (args
, *temps
);
751 for (argnum
= 0; !NILP (varlist
); varlist
= Fcdr (varlist
))
754 elt
= Fcar (varlist
);
756 temps
[argnum
++] = Qnil
;
757 else if (! NILP (Fcdr (Fcdr (elt
))))
759 Fcons (build_string ("`let' bindings can have only one value-form"),
762 temps
[argnum
++] = Feval (Fcar (Fcdr (elt
)));
763 gcpro2
.nvars
= argnum
;
767 varlist
= Fcar (args
);
768 for (argnum
= 0; !NILP (varlist
); varlist
= Fcdr (varlist
))
770 elt
= Fcar (varlist
);
771 tem
= temps
[argnum
++];
775 specbind (Fcar (elt
), tem
);
778 elt
= Fprogn (Fcdr (args
));
779 return unbind_to (count
, elt
);
782 DEFUN ("while", Fwhile
, Swhile
, 1, UNEVALLED
, 0,
783 "(while TEST BODY...): if TEST yields non-nil, eval BODY... and repeat.\n\
784 The order of execution is thus TEST, BODY, TEST, BODY and so on\n\
785 until TEST returns nil.")
789 Lisp_Object test
, body
, tem
;
790 struct gcpro gcpro1
, gcpro2
;
796 while (tem
= Feval (test
),
797 (!EQ (Vmocklisp_arguments
, Qt
) ? XINT (tem
) : !NILP (tem
)))
807 DEFUN ("macroexpand", Fmacroexpand
, Smacroexpand
, 1, 2, 0,
808 "Return result of expanding macros at top level of FORM.\n\
809 If FORM is not a macro call, it is returned unchanged.\n\
810 Otherwise, the macro is expanded and the expansion is considered\n\
811 in place of FORM. When a non-macro-call results, it is returned.\n\n\
812 The second optional arg ENVIRONMENT species an environment of macro\n\
813 definitions to shadow the loaded ones for use in file byte-compilation.")
816 Lisp_Object environment
;
818 /* With cleanups from Hallvard Furuseth. */
819 register Lisp_Object expander
, sym
, def
, tem
;
823 /* Come back here each time we expand a macro call,
824 in case it expands into another macro call. */
827 /* Set SYM, give DEF and TEM right values in case SYM is not a symbol. */
828 def
= sym
= XCONS (form
)->car
;
830 /* Trace symbols aliases to other symbols
831 until we get a symbol that is not an alias. */
832 while (SYMBOLP (def
))
836 tem
= Fassq (sym
, environment
);
839 def
= XSYMBOL (sym
)->function
;
840 if (!EQ (def
, Qunbound
))
845 /* Right now TEM is the result from SYM in ENVIRONMENT,
846 and if TEM is nil then DEF is SYM's function definition. */
849 /* SYM is not mentioned in ENVIRONMENT.
850 Look at its function definition. */
851 if (EQ (def
, Qunbound
) || !CONSP (def
))
852 /* Not defined or definition not suitable */
854 if (EQ (XCONS (def
)->car
, Qautoload
))
856 /* Autoloading function: will it be a macro when loaded? */
857 tem
= Fnth (make_number (4), def
);
858 if (EQ (tem
, Qt
) || EQ (tem
, Qmacro
))
859 /* Yes, load it and try again. */
863 do_autoload (def
, sym
);
870 else if (!EQ (XCONS (def
)->car
, Qmacro
))
872 else expander
= XCONS (def
)->cdr
;
876 expander
= XCONS (tem
)->cdr
;
880 form
= apply1 (expander
, XCONS (form
)->cdr
);
885 DEFUN ("catch", Fcatch
, Scatch
, 1, UNEVALLED
, 0,
886 "(catch TAG BODY...): eval BODY allowing nonlocal exits using `throw'.\n\
887 TAG is evalled to get the tag to use; it must not be nil.\n\
889 Then the BODY is executed.\n\
890 Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.\n\
891 If no throw happens, `catch' returns the value of the last BODY form.\n\
892 If a throw happens, it specifies the value to return from `catch'.")
896 register Lisp_Object tag
;
900 tag
= Feval (Fcar (args
));
902 return internal_catch (tag
, Fprogn
, Fcdr (args
));
905 /* Set up a catch, then call C function FUNC on argument ARG.
906 FUNC should return a Lisp_Object.
907 This is how catches are done from within C code. */
910 internal_catch (tag
, func
, arg
)
912 Lisp_Object (*func
) ();
915 /* This structure is made part of the chain `catchlist'. */
918 /* Fill in the components of c, and put it on the list. */
922 c
.backlist
= backtrace_list
;
923 c
.handlerlist
= handlerlist
;
924 c
.lisp_eval_depth
= lisp_eval_depth
;
925 c
.pdlcount
= specpdl_ptr
- specpdl
;
926 c
.poll_suppress_count
= poll_suppress_count
;
931 if (! _setjmp (c
.jmp
))
932 c
.val
= (*func
) (arg
);
934 /* Throw works by a longjmp that comes right here. */
939 /* Unwind the specbind, catch, and handler stacks back to CATCH, and
940 jump to that CATCH, returning VALUE as the value of that catch.
942 This is the guts Fthrow and Fsignal; they differ only in the way
943 they choose the catch tag to throw to. A catch tag for a
944 condition-case form has a TAG of Qnil.
946 Before each catch is discarded, unbind all special bindings and
947 execute all unwind-protect clauses made above that catch. Unwind
948 the handler stack as we go, so that the proper handlers are in
949 effect for each unwind-protect clause we run. At the end, restore
950 some static info saved in CATCH, and longjmp to the location
953 This is used for correct unwinding in Fthrow and Fsignal. */
956 unwind_to_catch (catch, value
)
957 struct catchtag
*catch;
960 register int last_time
;
962 /* Save the value in the tag. */
965 /* Restore the polling-suppression count. */
966 set_poll_suppress_count (catch->poll_suppress_count
);
970 last_time
= catchlist
== catch;
972 /* Unwind the specpdl stack, and then restore the proper set of
974 unbind_to (catchlist
->pdlcount
, Qnil
);
975 handlerlist
= catchlist
->handlerlist
;
976 catchlist
= catchlist
->next
;
980 gcprolist
= catch->gcpro
;
981 backtrace_list
= catch->backlist
;
982 lisp_eval_depth
= catch->lisp_eval_depth
;
984 _longjmp (catch->jmp
, 1);
987 DEFUN ("throw", Fthrow
, Sthrow
, 2, 2, 0,
988 "(throw TAG VALUE): throw to the catch for TAG and return VALUE from it.\n\
989 Both TAG and VALUE are evalled.")
991 register Lisp_Object tag
, value
;
993 register struct catchtag
*c
;
998 for (c
= catchlist
; c
; c
= c
->next
)
1000 if (EQ (c
->tag
, tag
))
1001 unwind_to_catch (c
, value
);
1003 tag
= Fsignal (Qno_catch
, Fcons (tag
, Fcons (value
, Qnil
)));
1008 DEFUN ("unwind-protect", Funwind_protect
, Sunwind_protect
, 1, UNEVALLED
, 0,
1009 "Do BODYFORM, protecting with UNWINDFORMS.\n\
1010 Usage looks like (unwind-protect BODYFORM UNWINDFORMS...).\n\
1011 If BODYFORM completes normally, its value is returned\n\
1012 after executing the UNWINDFORMS.\n\
1013 If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.")
1018 int count
= specpdl_ptr
- specpdl
;
1020 record_unwind_protect (0, Fcdr (args
));
1021 val
= Feval (Fcar (args
));
1022 return unbind_to (count
, val
);
1025 /* Chain of condition handlers currently in effect.
1026 The elements of this chain are contained in the stack frames
1027 of Fcondition_case and internal_condition_case.
1028 When an error is signaled (by calling Fsignal, below),
1029 this chain is searched for an element that applies. */
1031 struct handler
*handlerlist
;
1033 DEFUN ("condition-case", Fcondition_case
, Scondition_case
, 2, UNEVALLED
, 0,
1034 "Regain control when an error is signaled.\n\
1035 Usage looks like (condition-case VAR BODYFORM HANDLERS...).\n\
1036 executes BODYFORM and returns its value if no error happens.\n\
1037 Each element of HANDLERS looks like (CONDITION-NAME BODY...)\n\
1038 where the BODY is made of Lisp expressions.\n\n\
1039 A handler is applicable to an error\n\
1040 if CONDITION-NAME is one of the error's condition names.\n\
1041 If an error happens, the first applicable handler is run.\n\
1043 The car of a handler may be a list of condition names\n\
1044 instead of a single condition name.\n\
1046 When a handler handles an error,\n\
1047 control returns to the condition-case and the handler BODY... is executed\n\
1048 with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).\n\
1049 VAR may be nil; then you do not get access to the signal information.\n\
1051 The value of the last BODY form is returned from the condition-case.\n\
1052 See also the function `signal' for more info.")
1059 register Lisp_Object var
, bodyform
, handlers
;
1062 bodyform
= Fcar (Fcdr (args
));
1063 handlers
= Fcdr (Fcdr (args
));
1064 CHECK_SYMBOL (var
, 0);
1066 for (val
= handlers
; ! NILP (val
); val
= Fcdr (val
))
1072 && (SYMBOLP (XCONS (tem
)->car
)
1073 || CONSP (XCONS (tem
)->car
)))))
1074 error ("Invalid condition handler", tem
);
1079 c
.backlist
= backtrace_list
;
1080 c
.handlerlist
= handlerlist
;
1081 c
.lisp_eval_depth
= lisp_eval_depth
;
1082 c
.pdlcount
= specpdl_ptr
- specpdl
;
1083 c
.poll_suppress_count
= poll_suppress_count
;
1084 c
.gcpro
= gcprolist
;
1085 if (_setjmp (c
.jmp
))
1088 specbind (h
.var
, c
.val
);
1089 val
= Fprogn (Fcdr (h
.chosen_clause
));
1091 /* Note that this just undoes the binding of h.var; whoever
1092 longjumped to us unwound the stack to c.pdlcount before
1094 unbind_to (c
.pdlcount
, Qnil
);
1101 h
.handler
= handlers
;
1102 h
.next
= handlerlist
;
1106 val
= Feval (bodyform
);
1108 handlerlist
= h
.next
;
1112 /* Call the function BFUN with no arguments, catching errors within it
1113 according to HANDLERS. If there is an error, call HFUN with
1114 one argument which is the data that describes the error:
1117 HANDLERS can be a list of conditions to catch.
1118 If HANDLERS is Qt, catch all errors.
1119 If HANDLERS is Qerror, catch all errors
1120 but allow the debugger to run if that is enabled. */
1123 internal_condition_case (bfun
, handlers
, hfun
)
1124 Lisp_Object (*bfun
) ();
1125 Lisp_Object handlers
;
1126 Lisp_Object (*hfun
) ();
1132 /* Since Fsignal resets this to 0, it had better be 0 now
1133 or else we have a potential bug. */
1134 if (interrupt_input_blocked
!= 0)
1139 c
.backlist
= backtrace_list
;
1140 c
.handlerlist
= handlerlist
;
1141 c
.lisp_eval_depth
= lisp_eval_depth
;
1142 c
.pdlcount
= specpdl_ptr
- specpdl
;
1143 c
.poll_suppress_count
= poll_suppress_count
;
1144 c
.gcpro
= gcprolist
;
1145 if (_setjmp (c
.jmp
))
1147 return (*hfun
) (c
.val
);
1151 h
.handler
= handlers
;
1153 h
.next
= handlerlist
;
1159 handlerlist
= h
.next
;
1163 /* Like internal_condition_case but call HFUN with ARG as its argument. */
1166 internal_condition_case_1 (bfun
, arg
, handlers
, hfun
)
1167 Lisp_Object (*bfun
) ();
1169 Lisp_Object handlers
;
1170 Lisp_Object (*hfun
) ();
1178 c
.backlist
= backtrace_list
;
1179 c
.handlerlist
= handlerlist
;
1180 c
.lisp_eval_depth
= lisp_eval_depth
;
1181 c
.pdlcount
= specpdl_ptr
- specpdl
;
1182 c
.poll_suppress_count
= poll_suppress_count
;
1183 c
.gcpro
= gcprolist
;
1184 if (_setjmp (c
.jmp
))
1186 return (*hfun
) (c
.val
);
1190 h
.handler
= handlers
;
1192 h
.next
= handlerlist
;
1196 val
= (*bfun
) (arg
);
1198 handlerlist
= h
.next
;
1202 static Lisp_Object
find_handler_clause ();
1204 DEFUN ("signal", Fsignal
, Ssignal
, 2, 2, 0,
1205 "Signal an error. Args are ERROR-SYMBOL and associated DATA.\n\
1206 This function does not return.\n\n\
1207 An error symbol is a symbol with an `error-conditions' property\n\
1208 that is a list of condition names.\n\
1209 A handler for any of those names will get to handle this signal.\n\
1210 The symbol `error' should normally be one of them.\n\
1212 DATA should be a list. Its elements are printed as part of the error message.\n\
1213 If the signal is handled, DATA is made available to the handler.\n\
1214 See also the function `condition-case'.")
1215 (error_symbol
, data
)
1216 Lisp_Object error_symbol
, data
;
1218 register struct handler
*allhandlers
= handlerlist
;
1219 Lisp_Object conditions
;
1220 extern int gc_in_progress
;
1221 extern int waiting_for_input
;
1222 Lisp_Object debugger_value
;
1224 Lisp_Object real_error_symbol
;
1225 Lisp_Object combined_data
;
1227 quit_error_check ();
1229 if (gc_in_progress
|| waiting_for_input
)
1232 TOTALLY_UNBLOCK_INPUT
;
1234 if (NILP (error_symbol
))
1235 real_error_symbol
= Fcar (data
);
1237 real_error_symbol
= error_symbol
;
1239 /* This hook is used by edebug. */
1240 if (! NILP (Vsignal_hook_function
))
1241 call2 (Vsignal_hook_function
, error_symbol
, data
);
1243 conditions
= Fget (real_error_symbol
, Qerror_conditions
);
1245 for (; handlerlist
; handlerlist
= handlerlist
->next
)
1247 register Lisp_Object clause
;
1248 clause
= find_handler_clause (handlerlist
->handler
, conditions
,
1249 error_symbol
, data
, &debugger_value
);
1251 #if 0 /* Most callers are not prepared to handle gc if this returns.
1252 So, since this feature is not very useful, take it out. */
1253 /* If have called debugger and user wants to continue,
1255 if (EQ (clause
, Qlambda
))
1256 return debugger_value
;
1258 if (EQ (clause
, Qlambda
))
1260 /* We can't return values to code which signaled an error, but we
1261 can continue code which has signaled a quit. */
1262 if (EQ (real_error_symbol
, Qquit
))
1265 error ("Cannot return from the debugger in an error");
1271 Lisp_Object unwind_data
;
1272 struct handler
*h
= handlerlist
;
1274 handlerlist
= allhandlers
;
1276 if (NILP (error_symbol
))
1279 unwind_data
= Fcons (error_symbol
, data
);
1280 h
->chosen_clause
= clause
;
1281 unwind_to_catch (h
->tag
, unwind_data
);
1285 handlerlist
= allhandlers
;
1286 /* If no handler is present now, try to run the debugger,
1287 and if that fails, throw to top level. */
1288 find_handler_clause (Qerror
, conditions
, error_symbol
, data
, &debugger_value
);
1290 Fthrow (Qtop_level
, Qt
);
1292 if (! NILP (error_symbol
))
1293 data
= Fcons (error_symbol
, data
);
1295 string
= Ferror_message_string (data
);
1296 fatal (XSTRING (string
)->data
, 0, 0);
1299 /* Return nonzero iff LIST is a non-nil atom or
1300 a list containing one of CONDITIONS. */
1303 wants_debugger (list
, conditions
)
1304 Lisp_Object list
, conditions
;
1311 while (CONSP (conditions
))
1313 Lisp_Object
this, tail
;
1314 this = XCONS (conditions
)->car
;
1315 for (tail
= list
; CONSP (tail
); tail
= XCONS (tail
)->cdr
)
1316 if (EQ (XCONS (tail
)->car
, this))
1318 conditions
= XCONS (conditions
)->cdr
;
1323 /* Return 1 if an error with condition-symbols CONDITIONS,
1324 and described by SIGNAL-DATA, should skip the debugger
1325 according to debugger-ignore-errors. */
1328 skip_debugger (conditions
, data
)
1329 Lisp_Object conditions
, data
;
1332 int first_string
= 1;
1333 Lisp_Object error_message
;
1335 for (tail
= Vdebug_ignored_errors
; CONSP (tail
);
1336 tail
= XCONS (tail
)->cdr
)
1338 if (STRINGP (XCONS (tail
)->car
))
1342 error_message
= Ferror_message_string (data
);
1345 if (fast_string_match (XCONS (tail
)->car
, error_message
) >= 0)
1350 Lisp_Object contail
;
1352 for (contail
= conditions
; CONSP (contail
);
1353 contail
= XCONS (contail
)->cdr
)
1354 if (EQ (XCONS (tail
)->car
, XCONS (contail
)->car
))
1362 /* Value of Qlambda means we have called debugger and user has continued.
1363 There are two ways to pass SIG and DATA:
1364 - SIG is the error symbol, and DATA is the rest of the data.
1365 = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
1367 Store value returned from debugger into *DEBUGGER_VALUE_PTR. */
1370 find_handler_clause (handlers
, conditions
, sig
, data
, debugger_value_ptr
)
1371 Lisp_Object handlers
, conditions
, sig
, data
;
1372 Lisp_Object
*debugger_value_ptr
;
1374 register Lisp_Object h
;
1375 register Lisp_Object tem
;
1377 if (EQ (handlers
, Qt
)) /* t is used by handlers for all conditions, set up by C code. */
1379 /* error is used similarly, but means print an error message
1380 and run the debugger if that is enabled. */
1381 if (EQ (handlers
, Qerror
)
1382 || !NILP (Vdebug_on_signal
)) /* This says call debugger even if
1383 there is a handler. */
1385 int count
= specpdl_ptr
- specpdl
;
1386 int debugger_called
= 0;
1387 Lisp_Object sig_symbol
, combined_data
;
1391 combined_data
= data
;
1392 sig_symbol
= Fcar (data
);
1396 combined_data
= Fcons (sig
, data
);
1400 if (wants_debugger (Vstack_trace_on_error
, conditions
))
1401 internal_with_output_to_temp_buffer ("*Backtrace*", Fbacktrace
, Qnil
);
1402 if ((EQ (sig_symbol
, Qquit
)
1404 : wants_debugger (Vdebug_on_error
, conditions
))
1405 && ! skip_debugger (conditions
, combined_data
)
1406 && when_entered_debugger
< num_nonmacro_input_events
)
1408 specbind (Qdebug_on_error
, Qnil
);
1410 = call_debugger (Fcons (Qerror
,
1411 Fcons (combined_data
, Qnil
)));
1412 debugger_called
= 1;
1414 /* If there is no handler, return saying whether we ran the debugger. */
1415 if (EQ (handlers
, Qerror
))
1417 if (debugger_called
)
1418 return unbind_to (count
, Qlambda
);
1422 for (h
= handlers
; CONSP (h
); h
= Fcdr (h
))
1424 Lisp_Object handler
, condit
;
1427 if (!CONSP (handler
))
1429 condit
= Fcar (handler
);
1430 /* Handle a single condition name in handler HANDLER. */
1431 if (SYMBOLP (condit
))
1433 tem
= Fmemq (Fcar (handler
), conditions
);
1437 /* Handle a list of condition names in handler HANDLER. */
1438 else if (CONSP (condit
))
1440 while (CONSP (condit
))
1442 tem
= Fmemq (Fcar (condit
), conditions
);
1445 condit
= XCONS (condit
)->cdr
;
1452 /* dump an error message; called like printf */
1456 error (m
, a1
, a2
, a3
)
1476 int used
= doprnt (buf
, size
, m
, m
+ mlen
, 3, args
);
1481 buffer
= (char *) xrealloc (buffer
, size
);
1484 buffer
= (char *) xmalloc (size
);
1489 string
= build_string (buf
);
1493 Fsignal (Qerror
, Fcons (string
, Qnil
));
1496 DEFUN ("commandp", Fcommandp
, Scommandp
, 1, 1, 0,
1497 "T if FUNCTION makes provisions for interactive calling.\n\
1498 This means it contains a description for how to read arguments to give it.\n\
1499 The value is nil for an invalid function or a symbol with no function\n\
1502 Interactively callable functions include strings and vectors (treated\n\
1503 as keyboard macros), lambda-expressions that contain a top-level call\n\
1504 to `interactive', autoload definitions made by `autoload' with non-nil\n\
1505 fourth argument, and some of the built-in functions of Lisp.\n\
1507 Also, a symbol satisfies `commandp' if its function definition does so.")
1509 Lisp_Object function
;
1511 register Lisp_Object fun
;
1512 register Lisp_Object funcar
;
1513 register Lisp_Object tem
;
1518 fun
= indirect_function (fun
);
1519 if (EQ (fun
, Qunbound
))
1522 /* Emacs primitives are interactive if their DEFUN specifies an
1523 interactive spec. */
1526 if (XSUBR (fun
)->prompt
)
1532 /* Bytecode objects are interactive if they are long enough to
1533 have an element whose index is COMPILED_INTERACTIVE, which is
1534 where the interactive spec is stored. */
1535 else if (COMPILEDP (fun
))
1536 return ((XVECTOR (fun
)->size
& PSEUDOVECTOR_SIZE_MASK
) > COMPILED_INTERACTIVE
1539 /* Strings and vectors are keyboard macros. */
1540 if (STRINGP (fun
) || VECTORP (fun
))
1543 /* Lists may represent commands. */
1546 funcar
= Fcar (fun
);
1547 if (!SYMBOLP (funcar
))
1548 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
1549 if (EQ (funcar
, Qlambda
))
1550 return Fassq (Qinteractive
, Fcdr (Fcdr (fun
)));
1551 if (EQ (funcar
, Qmocklisp
))
1552 return Qt
; /* All mocklisp functions can be called interactively */
1553 if (EQ (funcar
, Qautoload
))
1554 return Fcar (Fcdr (Fcdr (Fcdr (fun
))));
1560 DEFUN ("autoload", Fautoload
, Sautoload
, 2, 5, 0,
1561 "Define FUNCTION to autoload from FILE.\n\
1562 FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\
1563 Third arg DOCSTRING is documentation for the function.\n\
1564 Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\
1565 Fifth arg TYPE indicates the type of the object:\n\
1566 nil or omitted says FUNCTION is a function,\n\
1567 `keymap' says FUNCTION is really a keymap, and\n\
1568 `macro' or t says FUNCTION is really a macro.\n\
1569 Third through fifth args give info about the real definition.\n\
1570 They default to nil.\n\
1571 If FUNCTION is already defined other than as an autoload,\n\
1572 this does nothing and returns nil.")
1573 (function
, file
, docstring
, interactive
, type
)
1574 Lisp_Object function
, file
, docstring
, interactive
, type
;
1577 Lisp_Object args
[4];
1580 CHECK_SYMBOL (function
, 0);
1581 CHECK_STRING (file
, 1);
1583 /* If function is defined and not as an autoload, don't override */
1584 if (!EQ (XSYMBOL (function
)->function
, Qunbound
)
1585 && !(CONSP (XSYMBOL (function
)->function
)
1586 && EQ (XCONS (XSYMBOL (function
)->function
)->car
, Qautoload
)))
1591 args
[1] = docstring
;
1592 args
[2] = interactive
;
1595 return Ffset (function
, Fcons (Qautoload
, Flist (4, &args
[0])));
1596 #else /* NO_ARG_ARRAY */
1597 return Ffset (function
, Fcons (Qautoload
, Flist (4, &file
)));
1598 #endif /* not NO_ARG_ARRAY */
1602 un_autoload (oldqueue
)
1603 Lisp_Object oldqueue
;
1605 register Lisp_Object queue
, first
, second
;
1607 /* Queue to unwind is current value of Vautoload_queue.
1608 oldqueue is the shadowed value to leave in Vautoload_queue. */
1609 queue
= Vautoload_queue
;
1610 Vautoload_queue
= oldqueue
;
1611 while (CONSP (queue
))
1613 first
= Fcar (queue
);
1614 second
= Fcdr (first
);
1615 first
= Fcar (first
);
1616 if (EQ (second
, Qnil
))
1619 Ffset (first
, second
);
1620 queue
= Fcdr (queue
);
1625 /* Load an autoloaded function.
1626 FUNNAME is the symbol which is the function's name.
1627 FUNDEF is the autoload definition (a list). */
1630 do_autoload (fundef
, funname
)
1631 Lisp_Object fundef
, funname
;
1633 int count
= specpdl_ptr
- specpdl
;
1634 Lisp_Object fun
, val
, queue
, first
, second
;
1635 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1638 CHECK_SYMBOL (funname
, 0);
1639 GCPRO3 (fun
, funname
, fundef
);
1641 /* Value saved here is to be restored into Vautoload_queue */
1642 record_unwind_protect (un_autoload
, Vautoload_queue
);
1643 Vautoload_queue
= Qt
;
1644 Fload (Fcar (Fcdr (fundef
)), Qnil
, noninteractive
? Qt
: Qnil
, Qnil
, Qt
);
1646 /* Save the old autoloads, in case we ever do an unload. */
1647 queue
= Vautoload_queue
;
1648 while (CONSP (queue
))
1650 first
= Fcar (queue
);
1651 second
= Fcdr (first
);
1652 first
= Fcar (first
);
1654 /* Note: This test is subtle. The cdr of an autoload-queue entry
1655 may be an atom if the autoload entry was generated by a defalias
1658 Fput (first
, Qautoload
, (Fcdr (second
)));
1660 queue
= Fcdr (queue
);
1663 /* Once loading finishes, don't undo it. */
1664 Vautoload_queue
= Qt
;
1665 unbind_to (count
, Qnil
);
1667 fun
= Findirect_function (fun
);
1669 if (!NILP (Fequal (fun
, fundef
)))
1670 error ("Autoloading failed to define function %s",
1671 XSYMBOL (funname
)->name
->data
);
1675 DEFUN ("eval", Feval
, Seval
, 1, 1, 0,
1676 "Evaluate FORM and return its value.")
1680 Lisp_Object fun
, val
, original_fun
, original_args
;
1682 struct backtrace backtrace
;
1683 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1687 if (EQ (Vmocklisp_arguments
, Qt
))
1688 return Fsymbol_value (form
);
1689 val
= Fsymbol_value (form
);
1691 XSETFASTINT (val
, 0);
1692 else if (EQ (val
, Qt
))
1693 XSETFASTINT (val
, 1);
1700 if (consing_since_gc
> gc_cons_threshold
)
1703 Fgarbage_collect ();
1707 if (++lisp_eval_depth
> max_lisp_eval_depth
)
1709 if (max_lisp_eval_depth
< 100)
1710 max_lisp_eval_depth
= 100;
1711 if (lisp_eval_depth
> max_lisp_eval_depth
)
1712 error ("Lisp nesting exceeds max-lisp-eval-depth");
1715 original_fun
= Fcar (form
);
1716 original_args
= Fcdr (form
);
1718 backtrace
.next
= backtrace_list
;
1719 backtrace_list
= &backtrace
;
1720 backtrace
.function
= &original_fun
; /* This also protects them from gc */
1721 backtrace
.args
= &original_args
;
1722 backtrace
.nargs
= UNEVALLED
;
1723 backtrace
.evalargs
= 1;
1724 backtrace
.debug_on_exit
= 0;
1726 if (debug_on_next_call
)
1727 do_debug_on_call (Qt
);
1729 /* At this point, only original_fun and original_args
1730 have values that will be used below */
1732 fun
= Findirect_function (original_fun
);
1736 Lisp_Object numargs
;
1737 Lisp_Object argvals
[8];
1738 Lisp_Object args_left
;
1739 register int i
, maxargs
;
1741 args_left
= original_args
;
1742 numargs
= Flength (args_left
);
1744 if (XINT (numargs
) < XSUBR (fun
)->min_args
||
1745 (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< XINT (numargs
)))
1746 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (numargs
, Qnil
)));
1748 if (XSUBR (fun
)->max_args
== UNEVALLED
)
1750 backtrace
.evalargs
= 0;
1751 val
= (*XSUBR (fun
)->function
) (args_left
);
1755 if (XSUBR (fun
)->max_args
== MANY
)
1757 /* Pass a vector of evaluated arguments */
1759 register int argnum
= 0;
1761 vals
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
1763 GCPRO3 (args_left
, fun
, fun
);
1767 while (!NILP (args_left
))
1769 vals
[argnum
++] = Feval (Fcar (args_left
));
1770 args_left
= Fcdr (args_left
);
1771 gcpro3
.nvars
= argnum
;
1774 backtrace
.args
= vals
;
1775 backtrace
.nargs
= XINT (numargs
);
1777 val
= (*XSUBR (fun
)->function
) (XINT (numargs
), vals
);
1782 GCPRO3 (args_left
, fun
, fun
);
1783 gcpro3
.var
= argvals
;
1786 maxargs
= XSUBR (fun
)->max_args
;
1787 for (i
= 0; i
< maxargs
; args_left
= Fcdr (args_left
))
1789 argvals
[i
] = Feval (Fcar (args_left
));
1795 backtrace
.args
= argvals
;
1796 backtrace
.nargs
= XINT (numargs
);
1801 val
= (*XSUBR (fun
)->function
) ();
1804 val
= (*XSUBR (fun
)->function
) (argvals
[0]);
1807 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1]);
1810 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
1814 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
1815 argvals
[2], argvals
[3]);
1818 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
1819 argvals
[3], argvals
[4]);
1822 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
1823 argvals
[3], argvals
[4], argvals
[5]);
1826 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
1827 argvals
[3], argvals
[4], argvals
[5],
1832 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
1833 argvals
[3], argvals
[4], argvals
[5],
1834 argvals
[6], argvals
[7]);
1838 /* Someone has created a subr that takes more arguments than
1839 is supported by this code. We need to either rewrite the
1840 subr to use a different argument protocol, or add more
1841 cases to this switch. */
1845 if (COMPILEDP (fun
))
1846 val
= apply_lambda (fun
, original_args
, 1);
1850 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
1851 funcar
= Fcar (fun
);
1852 if (!SYMBOLP (funcar
))
1853 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
1854 if (EQ (funcar
, Qautoload
))
1856 do_autoload (fun
, original_fun
);
1859 if (EQ (funcar
, Qmacro
))
1860 val
= Feval (apply1 (Fcdr (fun
), original_args
));
1861 else if (EQ (funcar
, Qlambda
))
1862 val
= apply_lambda (fun
, original_args
, 1);
1863 else if (EQ (funcar
, Qmocklisp
))
1864 val
= ml_apply (fun
, original_args
);
1866 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
1869 if (!EQ (Vmocklisp_arguments
, Qt
))
1872 XSETFASTINT (val
, 0);
1873 else if (EQ (val
, Qt
))
1874 XSETFASTINT (val
, 1);
1877 if (backtrace
.debug_on_exit
)
1878 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
1879 backtrace_list
= backtrace
.next
;
1883 DEFUN ("apply", Fapply
, Sapply
, 2, MANY
, 0,
1884 "Call FUNCTION with our remaining args, using our last arg as list of args.\n\
1885 Then return the value FUNCTION returns.\n\
1886 Thus, (apply '+ 1 2 '(3 4)) returns 10.")
1891 register int i
, numargs
;
1892 register Lisp_Object spread_arg
;
1893 register Lisp_Object
*funcall_args
;
1895 struct gcpro gcpro1
;
1899 spread_arg
= args
[nargs
- 1];
1900 CHECK_LIST (spread_arg
, nargs
);
1902 numargs
= XINT (Flength (spread_arg
));
1905 return Ffuncall (nargs
- 1, args
);
1906 else if (numargs
== 1)
1908 args
[nargs
- 1] = XCONS (spread_arg
)->car
;
1909 return Ffuncall (nargs
, args
);
1912 numargs
+= nargs
- 2;
1914 fun
= indirect_function (fun
);
1915 if (EQ (fun
, Qunbound
))
1917 /* Let funcall get the error */
1924 if (numargs
< XSUBR (fun
)->min_args
1925 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
1926 goto funcall
; /* Let funcall get the error */
1927 else if (XSUBR (fun
)->max_args
> numargs
)
1929 /* Avoid making funcall cons up a yet another new vector of arguments
1930 by explicitly supplying nil's for optional values */
1931 funcall_args
= (Lisp_Object
*) alloca ((1 + XSUBR (fun
)->max_args
)
1932 * sizeof (Lisp_Object
));
1933 for (i
= numargs
; i
< XSUBR (fun
)->max_args
;)
1934 funcall_args
[++i
] = Qnil
;
1935 GCPRO1 (*funcall_args
);
1936 gcpro1
.nvars
= 1 + XSUBR (fun
)->max_args
;
1940 /* We add 1 to numargs because funcall_args includes the
1941 function itself as well as its arguments. */
1944 funcall_args
= (Lisp_Object
*) alloca ((1 + numargs
)
1945 * sizeof (Lisp_Object
));
1946 GCPRO1 (*funcall_args
);
1947 gcpro1
.nvars
= 1 + numargs
;
1950 bcopy (args
, funcall_args
, nargs
* sizeof (Lisp_Object
));
1951 /* Spread the last arg we got. Its first element goes in
1952 the slot that it used to occupy, hence this value of I. */
1954 while (!NILP (spread_arg
))
1956 funcall_args
[i
++] = XCONS (spread_arg
)->car
;
1957 spread_arg
= XCONS (spread_arg
)->cdr
;
1960 RETURN_UNGCPRO (Ffuncall (gcpro1
.nvars
, funcall_args
));
1963 /* Run hook variables in various ways. */
1965 enum run_hooks_condition
{to_completion
, until_success
, until_failure
};
1967 DEFUN ("run-hooks", Frun_hooks
, Srun_hooks
, 1, MANY
, 0,
1968 "Run each hook in HOOKS. Major mode functions use this.\n\
1969 Each argument should be a symbol, a hook variable.\n\
1970 These symbols are processed in the order specified.\n\
1971 If a hook symbol has a non-nil value, that value may be a function\n\
1972 or a list of functions to be called to run the hook.\n\
1973 If the value is a function, it is called with no arguments.\n\
1974 If it is a list, the elements are called, in order, with no arguments.\n\
1976 To make a hook variable buffer-local, use `make-local-hook',\n\
1977 not `make-local-variable'.")
1982 Lisp_Object hook
[1];
1985 for (i
= 0; i
< nargs
; i
++)
1988 run_hook_with_args (1, hook
, to_completion
);
1994 DEFUN ("run-hook-with-args", Frun_hook_with_args
,
1995 Srun_hook_with_args
, 1, MANY
, 0,
1996 "Run HOOK with the specified arguments ARGS.\n\
1997 HOOK should be a symbol, a hook variable. If HOOK has a non-nil\n\
1998 value, that value may be a function or a list of functions to be\n\
1999 called to run the hook. If the value is a function, it is called with\n\
2000 the given arguments and its return value is returned. If it is a list\n\
2001 of functions, those functions are called, in order,\n\
2002 with the given arguments ARGS.\n\
2003 It is best not to depend on the value return by `run-hook-with-args',\n\
2004 as that may change.\n\
2006 To make a hook variable buffer-local, use `make-local-hook',\n\
2007 not `make-local-variable'.")
2012 return run_hook_with_args (nargs
, args
, to_completion
);
2015 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success
,
2016 Srun_hook_with_args_until_success
, 1, MANY
, 0,
2017 "Run HOOK with the specified arguments ARGS.\n\
2018 HOOK should be a symbol, a hook variable. Its value should\n\
2019 be a list of functions. We call those functions, one by one,\n\
2020 passing arguments ARGS to each of them, until one of them\n\
2021 returns a non-nil value. Then we return that value.\n\
2022 If all the functions return nil, we return nil.\n\
2024 To make a hook variable buffer-local, use `make-local-hook',\n\
2025 not `make-local-variable'.")
2030 return run_hook_with_args (nargs
, args
, until_success
);
2033 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure
,
2034 Srun_hook_with_args_until_failure
, 1, MANY
, 0,
2035 "Run HOOK with the specified arguments ARGS.\n\
2036 HOOK should be a symbol, a hook variable. Its value should\n\
2037 be a list of functions. We call those functions, one by one,\n\
2038 passing arguments ARGS to each of them, until one of them\n\
2039 returns nil. Then we return nil.\n\
2040 If all the functions return non-nil, we return non-nil.\n\
2042 To make a hook variable buffer-local, use `make-local-hook',\n\
2043 not `make-local-variable'.")
2048 return run_hook_with_args (nargs
, args
, until_failure
);
2051 /* ARGS[0] should be a hook symbol.
2052 Call each of the functions in the hook value, passing each of them
2053 as arguments all the rest of ARGS (all NARGS - 1 elements).
2054 COND specifies a condition to test after each call
2055 to decide whether to stop.
2056 The caller (or its caller, etc) must gcpro all of ARGS,
2057 except that it isn't necessary to gcpro ARGS[0]. */
2060 run_hook_with_args (nargs
, args
, cond
)
2063 enum run_hooks_condition cond
;
2065 Lisp_Object sym
, val
, ret
;
2066 struct gcpro gcpro1
, gcpro2
;
2068 /* If we are dying or still initializing,
2069 don't do anything--it would probably crash if we tried. */
2070 if (NILP (Vrun_hooks
))
2074 val
= find_symbol_value (sym
);
2075 ret
= (cond
== until_failure
? Qt
: Qnil
);
2077 if (EQ (val
, Qunbound
) || NILP (val
))
2079 else if (!CONSP (val
) || EQ (XCONS (val
)->car
, Qlambda
))
2082 return Ffuncall (nargs
, args
);
2089 CONSP (val
) && ((cond
== to_completion
)
2090 || (cond
== until_success
? NILP (ret
)
2092 val
= XCONS (val
)->cdr
)
2094 if (EQ (XCONS (val
)->car
, Qt
))
2096 /* t indicates this hook has a local binding;
2097 it means to run the global binding too. */
2098 Lisp_Object globals
;
2100 for (globals
= Fdefault_value (sym
);
2101 CONSP (globals
) && ((cond
== to_completion
)
2102 || (cond
== until_success
? NILP (ret
)
2104 globals
= XCONS (globals
)->cdr
)
2106 args
[0] = XCONS (globals
)->car
;
2107 /* In a global value, t should not occur. If it does, we
2108 must ignore it to avoid an endless loop. */
2109 if (!EQ (args
[0], Qt
))
2110 ret
= Ffuncall (nargs
, args
);
2115 args
[0] = XCONS (val
)->car
;
2116 ret
= Ffuncall (nargs
, args
);
2125 /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual
2126 present value of that symbol.
2127 Call each element of FUNLIST,
2128 passing each of them the rest of ARGS.
2129 The caller (or its caller, etc) must gcpro all of ARGS,
2130 except that it isn't necessary to gcpro ARGS[0]. */
2133 run_hook_list_with_args (funlist
, nargs
, args
)
2134 Lisp_Object funlist
;
2140 struct gcpro gcpro1
, gcpro2
;
2145 for (val
= funlist
; CONSP (val
); val
= XCONS (val
)->cdr
)
2147 if (EQ (XCONS (val
)->car
, Qt
))
2149 /* t indicates this hook has a local binding;
2150 it means to run the global binding too. */
2151 Lisp_Object globals
;
2153 for (globals
= Fdefault_value (sym
);
2155 globals
= XCONS (globals
)->cdr
)
2157 args
[0] = XCONS (globals
)->car
;
2158 /* In a global value, t should not occur. If it does, we
2159 must ignore it to avoid an endless loop. */
2160 if (!EQ (args
[0], Qt
))
2161 Ffuncall (nargs
, args
);
2166 args
[0] = XCONS (val
)->car
;
2167 Ffuncall (nargs
, args
);
2174 /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
2177 run_hook_with_args_2 (hook
, arg1
, arg2
)
2178 Lisp_Object hook
, arg1
, arg2
;
2180 Lisp_Object temp
[3];
2185 Frun_hook_with_args (3, temp
);
2188 /* Apply fn to arg */
2191 Lisp_Object fn
, arg
;
2193 struct gcpro gcpro1
;
2197 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2201 Lisp_Object args
[2];
2205 RETURN_UNGCPRO (Fapply (2, args
));
2207 #else /* not NO_ARG_ARRAY */
2208 RETURN_UNGCPRO (Fapply (2, &fn
));
2209 #endif /* not NO_ARG_ARRAY */
2212 /* Call function fn on no arguments */
2217 struct gcpro gcpro1
;
2220 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2223 /* Call function fn with 1 argument arg1 */
2227 Lisp_Object fn
, arg1
;
2229 struct gcpro gcpro1
;
2231 Lisp_Object args
[2];
2237 RETURN_UNGCPRO (Ffuncall (2, args
));
2238 #else /* not NO_ARG_ARRAY */
2241 RETURN_UNGCPRO (Ffuncall (2, &fn
));
2242 #endif /* not NO_ARG_ARRAY */
2245 /* Call function fn with 2 arguments arg1, arg2 */
2248 call2 (fn
, arg1
, arg2
)
2249 Lisp_Object fn
, arg1
, arg2
;
2251 struct gcpro gcpro1
;
2253 Lisp_Object args
[3];
2259 RETURN_UNGCPRO (Ffuncall (3, args
));
2260 #else /* not NO_ARG_ARRAY */
2263 RETURN_UNGCPRO (Ffuncall (3, &fn
));
2264 #endif /* not NO_ARG_ARRAY */
2267 /* Call function fn with 3 arguments arg1, arg2, arg3 */
2270 call3 (fn
, arg1
, arg2
, arg3
)
2271 Lisp_Object fn
, arg1
, arg2
, arg3
;
2273 struct gcpro gcpro1
;
2275 Lisp_Object args
[4];
2282 RETURN_UNGCPRO (Ffuncall (4, args
));
2283 #else /* not NO_ARG_ARRAY */
2286 RETURN_UNGCPRO (Ffuncall (4, &fn
));
2287 #endif /* not NO_ARG_ARRAY */
2290 /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */
2293 call4 (fn
, arg1
, arg2
, arg3
, arg4
)
2294 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
;
2296 struct gcpro gcpro1
;
2298 Lisp_Object args
[5];
2306 RETURN_UNGCPRO (Ffuncall (5, args
));
2307 #else /* not NO_ARG_ARRAY */
2310 RETURN_UNGCPRO (Ffuncall (5, &fn
));
2311 #endif /* not NO_ARG_ARRAY */
2314 /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */
2317 call5 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
)
2318 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
;
2320 struct gcpro gcpro1
;
2322 Lisp_Object args
[6];
2331 RETURN_UNGCPRO (Ffuncall (6, args
));
2332 #else /* not NO_ARG_ARRAY */
2335 RETURN_UNGCPRO (Ffuncall (6, &fn
));
2336 #endif /* not NO_ARG_ARRAY */
2339 /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */
2342 call6 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
)
2343 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
;
2345 struct gcpro gcpro1
;
2347 Lisp_Object args
[7];
2357 RETURN_UNGCPRO (Ffuncall (7, args
));
2358 #else /* not NO_ARG_ARRAY */
2361 RETURN_UNGCPRO (Ffuncall (7, &fn
));
2362 #endif /* not NO_ARG_ARRAY */
2365 DEFUN ("funcall", Ffuncall
, Sfuncall
, 1, MANY
, 0,
2366 "Call first argument as a function, passing remaining arguments to it.\n\
2367 Return the value that function returns.\n\
2368 Thus, (funcall 'cons 'x 'y) returns (x . y).")
2375 int numargs
= nargs
- 1;
2376 Lisp_Object lisp_numargs
;
2378 struct backtrace backtrace
;
2379 register Lisp_Object
*internal_args
;
2383 if (consing_since_gc
> gc_cons_threshold
)
2384 Fgarbage_collect ();
2386 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2388 if (max_lisp_eval_depth
< 100)
2389 max_lisp_eval_depth
= 100;
2390 if (lisp_eval_depth
> max_lisp_eval_depth
)
2391 error ("Lisp nesting exceeds max-lisp-eval-depth");
2394 backtrace
.next
= backtrace_list
;
2395 backtrace_list
= &backtrace
;
2396 backtrace
.function
= &args
[0];
2397 backtrace
.args
= &args
[1];
2398 backtrace
.nargs
= nargs
- 1;
2399 backtrace
.evalargs
= 0;
2400 backtrace
.debug_on_exit
= 0;
2402 if (debug_on_next_call
)
2403 do_debug_on_call (Qlambda
);
2409 fun
= Findirect_function (fun
);
2413 if (numargs
< XSUBR (fun
)->min_args
2414 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2416 XSETFASTINT (lisp_numargs
, numargs
);
2417 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (lisp_numargs
, Qnil
)));
2420 if (XSUBR (fun
)->max_args
== UNEVALLED
)
2421 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2423 if (XSUBR (fun
)->max_args
== MANY
)
2425 val
= (*XSUBR (fun
)->function
) (numargs
, args
+ 1);
2429 if (XSUBR (fun
)->max_args
> numargs
)
2431 internal_args
= (Lisp_Object
*) alloca (XSUBR (fun
)->max_args
* sizeof (Lisp_Object
));
2432 bcopy (args
+ 1, internal_args
, numargs
* sizeof (Lisp_Object
));
2433 for (i
= numargs
; i
< XSUBR (fun
)->max_args
; i
++)
2434 internal_args
[i
] = Qnil
;
2437 internal_args
= args
+ 1;
2438 switch (XSUBR (fun
)->max_args
)
2441 val
= (*XSUBR (fun
)->function
) ();
2444 val
= (*XSUBR (fun
)->function
) (internal_args
[0]);
2447 val
= (*XSUBR (fun
)->function
) (internal_args
[0],
2451 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2455 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2460 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2461 internal_args
[2], internal_args
[3],
2465 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2466 internal_args
[2], internal_args
[3],
2467 internal_args
[4], internal_args
[5]);
2470 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2471 internal_args
[2], internal_args
[3],
2472 internal_args
[4], internal_args
[5],
2477 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2478 internal_args
[2], internal_args
[3],
2479 internal_args
[4], internal_args
[5],
2480 internal_args
[6], internal_args
[7]);
2485 /* If a subr takes more than 8 arguments without using MANY
2486 or UNEVALLED, we need to extend this function to support it.
2487 Until this is done, there is no way to call the function. */
2491 if (COMPILEDP (fun
))
2492 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2496 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2497 funcar
= Fcar (fun
);
2498 if (!SYMBOLP (funcar
))
2499 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2500 if (EQ (funcar
, Qlambda
))
2501 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2502 else if (EQ (funcar
, Qmocklisp
))
2503 val
= ml_apply (fun
, Flist (numargs
, args
+ 1));
2504 else if (EQ (funcar
, Qautoload
))
2506 do_autoload (fun
, args
[0]);
2510 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2514 if (backtrace
.debug_on_exit
)
2515 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
2516 backtrace_list
= backtrace
.next
;
2521 apply_lambda (fun
, args
, eval_flag
)
2522 Lisp_Object fun
, args
;
2525 Lisp_Object args_left
;
2526 Lisp_Object numargs
;
2527 register Lisp_Object
*arg_vector
;
2528 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2530 register Lisp_Object tem
;
2532 numargs
= Flength (args
);
2533 arg_vector
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
2536 GCPRO3 (*arg_vector
, args_left
, fun
);
2539 for (i
= 0; i
< XINT (numargs
);)
2541 tem
= Fcar (args_left
), args_left
= Fcdr (args_left
);
2542 if (eval_flag
) tem
= Feval (tem
);
2543 arg_vector
[i
++] = tem
;
2551 backtrace_list
->args
= arg_vector
;
2552 backtrace_list
->nargs
= i
;
2554 backtrace_list
->evalargs
= 0;
2555 tem
= funcall_lambda (fun
, XINT (numargs
), arg_vector
);
2557 /* Do the debug-on-exit now, while arg_vector still exists. */
2558 if (backtrace_list
->debug_on_exit
)
2559 tem
= call_debugger (Fcons (Qexit
, Fcons (tem
, Qnil
)));
2560 /* Don't do it again when we return to eval. */
2561 backtrace_list
->debug_on_exit
= 0;
2565 /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
2566 and return the result of evaluation.
2567 FUN must be either a lambda-expression or a compiled-code object. */
2570 funcall_lambda (fun
, nargs
, arg_vector
)
2573 register Lisp_Object
*arg_vector
;
2575 Lisp_Object val
, tem
;
2576 register Lisp_Object syms_left
;
2577 Lisp_Object numargs
;
2578 register Lisp_Object next
;
2579 int count
= specpdl_ptr
- specpdl
;
2581 int optional
= 0, rest
= 0;
2583 specbind (Qmocklisp_arguments
, Qt
); /* t means NOT mocklisp! */
2585 XSETFASTINT (numargs
, nargs
);
2588 syms_left
= Fcar (Fcdr (fun
));
2589 else if (COMPILEDP (fun
))
2590 syms_left
= XVECTOR (fun
)->contents
[COMPILED_ARGLIST
];
2594 for (; !NILP (syms_left
); syms_left
= Fcdr (syms_left
))
2597 next
= Fcar (syms_left
);
2598 while (!SYMBOLP (next
))
2599 next
= Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2600 if (EQ (next
, Qand_rest
))
2602 else if (EQ (next
, Qand_optional
))
2606 specbind (next
, Flist (nargs
- i
, &arg_vector
[i
]));
2611 tem
= arg_vector
[i
++];
2612 specbind (next
, tem
);
2615 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (numargs
, Qnil
)));
2617 specbind (next
, Qnil
);
2621 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (numargs
, Qnil
)));
2624 val
= Fprogn (Fcdr (Fcdr (fun
)));
2627 /* If we have not actually read the bytecode string
2628 and constants vector yet, fetch them from the file. */
2629 if (CONSP (XVECTOR (fun
)->contents
[COMPILED_BYTECODE
]))
2630 Ffetch_bytecode (fun
);
2631 val
= Fbyte_code (XVECTOR (fun
)->contents
[COMPILED_BYTECODE
],
2632 XVECTOR (fun
)->contents
[COMPILED_CONSTANTS
],
2633 XVECTOR (fun
)->contents
[COMPILED_STACK_DEPTH
]);
2635 return unbind_to (count
, val
);
2638 DEFUN ("fetch-bytecode", Ffetch_bytecode
, Sfetch_bytecode
,
2640 "If byte-compiled OBJECT is lazy-loaded, fetch it now.")
2646 if (COMPILEDP (object
)
2647 && CONSP (XVECTOR (object
)->contents
[COMPILED_BYTECODE
]))
2649 tem
= read_doc_string (XVECTOR (object
)->contents
[COMPILED_BYTECODE
]);
2651 error ("invalid byte code");
2652 XVECTOR (object
)->contents
[COMPILED_BYTECODE
] = XCONS (tem
)->car
;
2653 XVECTOR (object
)->contents
[COMPILED_CONSTANTS
] = XCONS (tem
)->cdr
;
2661 register int count
= specpdl_ptr
- specpdl
;
2662 if (specpdl_size
>= max_specpdl_size
)
2664 if (max_specpdl_size
< 400)
2665 max_specpdl_size
= 400;
2666 if (specpdl_size
>= max_specpdl_size
)
2668 if (!NILP (Vdebug_on_error
))
2669 /* Leave room for some specpdl in the debugger. */
2670 max_specpdl_size
= specpdl_size
+ 100;
2672 Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil
));
2676 if (specpdl_size
> max_specpdl_size
)
2677 specpdl_size
= max_specpdl_size
;
2678 specpdl
= (struct specbinding
*) xrealloc (specpdl
, specpdl_size
* sizeof (struct specbinding
));
2679 specpdl_ptr
= specpdl
+ count
;
2683 specbind (symbol
, value
)
2684 Lisp_Object symbol
, value
;
2688 CHECK_SYMBOL (symbol
, 0);
2690 if (specpdl_ptr
== specpdl
+ specpdl_size
)
2692 specpdl_ptr
->symbol
= symbol
;
2693 specpdl_ptr
->func
= 0;
2694 specpdl_ptr
->old_value
= ovalue
= find_symbol_value (symbol
);
2696 if (BUFFER_OBJFWDP (ovalue
) || KBOARD_OBJFWDP (ovalue
))
2697 store_symval_forwarding (symbol
, ovalue
, value
);
2699 set_internal (symbol
, value
, 1);
2703 record_unwind_protect (function
, arg
)
2704 Lisp_Object (*function
) P_ ((Lisp_Object
));
2707 if (specpdl_ptr
== specpdl
+ specpdl_size
)
2709 specpdl_ptr
->func
= function
;
2710 specpdl_ptr
->symbol
= Qnil
;
2711 specpdl_ptr
->old_value
= arg
;
2716 unbind_to (count
, value
)
2720 int quitf
= !NILP (Vquit_flag
);
2721 struct gcpro gcpro1
;
2727 while (specpdl_ptr
!= specpdl
+ count
)
2730 if (specpdl_ptr
->func
!= 0)
2731 (*specpdl_ptr
->func
) (specpdl_ptr
->old_value
);
2732 /* Note that a "binding" of nil is really an unwind protect,
2733 so in that case the "old value" is a list of forms to evaluate. */
2734 else if (NILP (specpdl_ptr
->symbol
))
2735 Fprogn (specpdl_ptr
->old_value
);
2737 set_internal (specpdl_ptr
->symbol
, specpdl_ptr
->old_value
, 1);
2739 if (NILP (Vquit_flag
) && quitf
) Vquit_flag
= Qt
;
2748 /* Get the value of symbol's global binding, even if that binding
2749 is not now dynamically visible. */
2752 top_level_value (symbol
)
2755 register struct specbinding
*ptr
= specpdl
;
2757 CHECK_SYMBOL (symbol
, 0);
2758 for (; ptr
!= specpdl_ptr
; ptr
++)
2760 if (EQ (ptr
->symbol
, symbol
))
2761 return ptr
->old_value
;
2763 return Fsymbol_value (symbol
);
2767 top_level_set (symbol
, newval
)
2768 Lisp_Object symbol
, newval
;
2770 register struct specbinding
*ptr
= specpdl
;
2772 CHECK_SYMBOL (symbol
, 0);
2773 for (; ptr
!= specpdl_ptr
; ptr
++)
2775 if (EQ (ptr
->symbol
, symbol
))
2777 ptr
->old_value
= newval
;
2781 return Fset (symbol
, newval
);
2786 DEFUN ("backtrace-debug", Fbacktrace_debug
, Sbacktrace_debug
, 2, 2, 0,
2787 "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\
2788 The debugger is entered when that frame exits, if the flag is non-nil.")
2790 Lisp_Object level
, flag
;
2792 register struct backtrace
*backlist
= backtrace_list
;
2795 CHECK_NUMBER (level
, 0);
2797 for (i
= 0; backlist
&& i
< XINT (level
); i
++)
2799 backlist
= backlist
->next
;
2803 backlist
->debug_on_exit
= !NILP (flag
);
2808 DEFUN ("backtrace", Fbacktrace
, Sbacktrace
, 0, 0, "",
2809 "Print a trace of Lisp function calls currently active.\n\
2810 Output stream used is value of `standard-output'.")
2813 register struct backtrace
*backlist
= backtrace_list
;
2817 extern Lisp_Object Vprint_level
;
2818 struct gcpro gcpro1
;
2820 XSETFASTINT (Vprint_level
, 3);
2827 write_string (backlist
->debug_on_exit
? "* " : " ", 2);
2828 if (backlist
->nargs
== UNEVALLED
)
2830 Fprin1 (Fcons (*backlist
->function
, *backlist
->args
), Qnil
);
2831 write_string ("\n", -1);
2835 tem
= *backlist
->function
;
2836 Fprin1 (tem
, Qnil
); /* This can QUIT */
2837 write_string ("(", -1);
2838 if (backlist
->nargs
== MANY
)
2840 for (tail
= *backlist
->args
, i
= 0;
2842 tail
= Fcdr (tail
), i
++)
2844 if (i
) write_string (" ", -1);
2845 Fprin1 (Fcar (tail
), Qnil
);
2850 for (i
= 0; i
< backlist
->nargs
; i
++)
2852 if (i
) write_string (" ", -1);
2853 Fprin1 (backlist
->args
[i
], Qnil
);
2856 write_string (")\n", -1);
2858 backlist
= backlist
->next
;
2861 Vprint_level
= Qnil
;
2866 DEFUN ("backtrace-frame", Fbacktrace_frame
, Sbacktrace_frame
, 1, 1, "",
2867 "Return the function and arguments NFRAMES up from current execution point.\n\
2868 If that frame has not evaluated the arguments yet (or is a special form),\n\
2869 the value is (nil FUNCTION ARG-FORMS...).\n\
2870 If that frame has evaluated its arguments and called its function already,\n\
2871 the value is (t FUNCTION ARG-VALUES...).\n\
2872 A &rest arg is represented as the tail of the list ARG-VALUES.\n\
2873 FUNCTION is whatever was supplied as car of evaluated list,\n\
2874 or a lambda expression for macro calls.\n\
2875 If NFRAMES is more than the number of frames, the value is nil.")
2877 Lisp_Object nframes
;
2879 register struct backtrace
*backlist
= backtrace_list
;
2883 CHECK_NATNUM (nframes
, 0);
2885 /* Find the frame requested. */
2886 for (i
= 0; backlist
&& i
< XFASTINT (nframes
); i
++)
2887 backlist
= backlist
->next
;
2891 if (backlist
->nargs
== UNEVALLED
)
2892 return Fcons (Qnil
, Fcons (*backlist
->function
, *backlist
->args
));
2895 if (backlist
->nargs
== MANY
)
2896 tem
= *backlist
->args
;
2898 tem
= Flist (backlist
->nargs
, backlist
->args
);
2900 return Fcons (Qt
, Fcons (*backlist
->function
, tem
));
2907 DEFVAR_INT ("max-specpdl-size", &max_specpdl_size
,
2908 "*Limit on number of Lisp variable bindings & unwind-protects.\n\
2909 If Lisp code tries to make more than this many at once,\n\
2910 an error is signaled.");
2912 DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth
,
2913 "*Limit on depth in `eval', `apply' and `funcall' before error.\n\
2914 This limit is to catch infinite recursions for you before they cause\n\
2915 actual stack overflow in C, which would be fatal for Emacs.\n\
2916 You can safely make it considerably larger than its default value,\n\
2917 if that proves inconveniently small.");
2919 DEFVAR_LISP ("quit-flag", &Vquit_flag
,
2920 "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\
2921 Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'.");
2924 DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit
,
2925 "Non-nil inhibits C-g quitting from happening immediately.\n\
2926 Note that `quit-flag' will still be set by typing C-g,\n\
2927 so a quit will be signaled as soon as `inhibit-quit' is nil.\n\
2928 To prevent this happening, set `quit-flag' to nil\n\
2929 before making `inhibit-quit' nil.");
2930 Vinhibit_quit
= Qnil
;
2932 Qinhibit_quit
= intern ("inhibit-quit");
2933 staticpro (&Qinhibit_quit
);
2935 Qautoload
= intern ("autoload");
2936 staticpro (&Qautoload
);
2938 Qdebug_on_error
= intern ("debug-on-error");
2939 staticpro (&Qdebug_on_error
);
2941 Qmacro
= intern ("macro");
2942 staticpro (&Qmacro
);
2944 /* Note that the process handling also uses Qexit, but we don't want
2945 to staticpro it twice, so we just do it here. */
2946 Qexit
= intern ("exit");
2949 Qinteractive
= intern ("interactive");
2950 staticpro (&Qinteractive
);
2952 Qcommandp
= intern ("commandp");
2953 staticpro (&Qcommandp
);
2955 Qdefun
= intern ("defun");
2956 staticpro (&Qdefun
);
2958 Qand_rest
= intern ("&rest");
2959 staticpro (&Qand_rest
);
2961 Qand_optional
= intern ("&optional");
2962 staticpro (&Qand_optional
);
2964 DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error
,
2965 "*Non-nil means automatically display a backtrace buffer\n\
2966 after any error that is handled by the editor command loop.\n\
2967 If the value is a list, an error only means to display a backtrace\n\
2968 if one of its condition symbols appears in the list.");
2969 Vstack_trace_on_error
= Qnil
;
2971 DEFVAR_LISP ("debug-on-error", &Vdebug_on_error
,
2972 "*Non-nil means enter debugger if an error is signaled.\n\
2973 Does not apply to errors handled by `condition-case'.\n\
2974 If the value is a list, an error only means to enter the debugger\n\
2975 if one of its condition symbols appears in the list.\n\
2976 See also variable `debug-on-quit'.");
2977 Vdebug_on_error
= Qnil
;
2979 DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors
,
2980 "*List of errors for which the debugger should not be called.\n\
2981 Each element may be a condition-name or a regexp that matches error messages.\n\
2982 If any element applies to a given error, that error skips the debugger\n\
2983 and just returns to top level.\n\
2984 This overrides the variable `debug-on-error'.\n\
2985 It does not apply to errors handled by `condition-case'.");
2986 Vdebug_ignored_errors
= Qnil
;
2988 DEFVAR_BOOL ("debug-on-quit", &debug_on_quit
,
2989 "*Non-nil means enter debugger if quit is signaled (C-g, for example).\n\
2990 Does not apply if quit is handled by a `condition-case'.");
2993 DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call
,
2994 "Non-nil means enter debugger before next `eval', `apply' or `funcall'.");
2996 DEFVAR_LISP ("debugger", &Vdebugger
,
2997 "Function to call to invoke debugger.\n\
2998 If due to frame exit, args are `exit' and the value being returned;\n\
2999 this function's value will be returned instead of that.\n\
3000 If due to error, args are `error' and a list of the args to `signal'.\n\
3001 If due to `apply' or `funcall' entry, one arg, `lambda'.\n\
3002 If due to `eval' entry, one arg, t.");
3005 DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function
,
3006 "If non-nil, this is a function for `signal' to call.\n\
3007 It receives the same arguments that `signal' was given.\n\
3008 The Edebug package uses this to regain control.");
3009 Vsignal_hook_function
= Qnil
;
3011 Qmocklisp_arguments
= intern ("mocklisp-arguments");
3012 staticpro (&Qmocklisp_arguments
);
3013 DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments
,
3014 "While in a mocklisp function, the list of its unevaluated args.");
3015 Vmocklisp_arguments
= Qt
;
3017 DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal
,
3018 "*Non-nil means call the debugger regardless of condition handlers.\n\
3019 Note that `debug-on-error', `debug-on-quit' and friends\n\
3020 still determine whether to handle the particular condition.");
3021 Vdebug_on_signal
= Qnil
;
3023 Vrun_hooks
= intern ("run-hooks");
3024 staticpro (&Vrun_hooks
);
3026 staticpro (&Vautoload_queue
);
3027 Vautoload_queue
= Qnil
;
3038 defsubr (&Sfunction
);
3040 defsubr (&Sdefmacro
);
3042 defsubr (&Sdefconst
);
3043 defsubr (&Suser_variable_p
);
3047 defsubr (&Smacroexpand
);
3050 defsubr (&Sunwind_protect
);
3051 defsubr (&Scondition_case
);
3053 defsubr (&Sinteractive_p
);
3054 defsubr (&Scommandp
);
3055 defsubr (&Sautoload
);
3058 defsubr (&Sfuncall
);
3059 defsubr (&Srun_hooks
);
3060 defsubr (&Srun_hook_with_args
);
3061 defsubr (&Srun_hook_with_args_until_success
);
3062 defsubr (&Srun_hook_with_args_until_failure
);
3063 defsubr (&Sfetch_bytecode
);
3064 defsubr (&Sbacktrace_debug
);
3065 defsubr (&Sbacktrace
);
3066 defsubr (&Sbacktrace_frame
);