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 #ifdef HAVE_WINDOW_SYSTEM
1233 TOTALLY_UNBLOCK_INPUT
;
1236 if (NILP (error_symbol
))
1237 real_error_symbol
= Fcar (data
);
1239 real_error_symbol
= error_symbol
;
1241 /* This hook is used by edebug. */
1242 if (! NILP (Vsignal_hook_function
))
1243 call2 (Vsignal_hook_function
, error_symbol
, data
);
1245 conditions
= Fget (real_error_symbol
, Qerror_conditions
);
1247 for (; handlerlist
; handlerlist
= handlerlist
->next
)
1249 register Lisp_Object clause
;
1250 clause
= find_handler_clause (handlerlist
->handler
, conditions
,
1251 error_symbol
, data
, &debugger_value
);
1253 #if 0 /* Most callers are not prepared to handle gc if this returns.
1254 So, since this feature is not very useful, take it out. */
1255 /* If have called debugger and user wants to continue,
1257 if (EQ (clause
, Qlambda
))
1258 return debugger_value
;
1260 if (EQ (clause
, Qlambda
))
1262 /* We can't return values to code which signaled an error, but we
1263 can continue code which has signaled a quit. */
1264 if (EQ (real_error_symbol
, Qquit
))
1267 error ("Cannot return from the debugger in an error");
1273 Lisp_Object unwind_data
;
1274 struct handler
*h
= handlerlist
;
1276 handlerlist
= allhandlers
;
1278 if (NILP (error_symbol
))
1281 unwind_data
= Fcons (error_symbol
, data
);
1282 h
->chosen_clause
= clause
;
1283 unwind_to_catch (h
->tag
, unwind_data
);
1287 handlerlist
= allhandlers
;
1288 /* If no handler is present now, try to run the debugger,
1289 and if that fails, throw to top level. */
1290 find_handler_clause (Qerror
, conditions
, error_symbol
, data
, &debugger_value
);
1292 Fthrow (Qtop_level
, Qt
);
1294 if (! NILP (error_symbol
))
1295 data
= Fcons (error_symbol
, data
);
1297 string
= Ferror_message_string (data
);
1298 fatal (XSTRING (string
)->data
, 0, 0);
1301 /* Return nonzero iff LIST is a non-nil atom or
1302 a list containing one of CONDITIONS. */
1305 wants_debugger (list
, conditions
)
1306 Lisp_Object list
, conditions
;
1313 while (CONSP (conditions
))
1315 Lisp_Object
this, tail
;
1316 this = XCONS (conditions
)->car
;
1317 for (tail
= list
; CONSP (tail
); tail
= XCONS (tail
)->cdr
)
1318 if (EQ (XCONS (tail
)->car
, this))
1320 conditions
= XCONS (conditions
)->cdr
;
1325 /* Return 1 if an error with condition-symbols CONDITIONS,
1326 and described by SIGNAL-DATA, should skip the debugger
1327 according to debugger-ignore-errors. */
1330 skip_debugger (conditions
, data
)
1331 Lisp_Object conditions
, data
;
1334 int first_string
= 1;
1335 Lisp_Object error_message
;
1337 for (tail
= Vdebug_ignored_errors
; CONSP (tail
);
1338 tail
= XCONS (tail
)->cdr
)
1340 if (STRINGP (XCONS (tail
)->car
))
1344 error_message
= Ferror_message_string (data
);
1347 if (fast_string_match (XCONS (tail
)->car
, error_message
) >= 0)
1352 Lisp_Object contail
;
1354 for (contail
= conditions
; CONSP (contail
);
1355 contail
= XCONS (contail
)->cdr
)
1356 if (EQ (XCONS (tail
)->car
, XCONS (contail
)->car
))
1364 /* Value of Qlambda means we have called debugger and user has continued.
1365 There are two ways to pass SIG and DATA:
1366 - SIG is the error symbol, and DATA is the rest of the data.
1367 = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
1369 Store value returned from debugger into *DEBUGGER_VALUE_PTR. */
1372 find_handler_clause (handlers
, conditions
, sig
, data
, debugger_value_ptr
)
1373 Lisp_Object handlers
, conditions
, sig
, data
;
1374 Lisp_Object
*debugger_value_ptr
;
1376 register Lisp_Object h
;
1377 register Lisp_Object tem
;
1379 if (EQ (handlers
, Qt
)) /* t is used by handlers for all conditions, set up by C code. */
1381 /* error is used similarly, but means print an error message
1382 and run the debugger if that is enabled. */
1383 if (EQ (handlers
, Qerror
)
1384 || !NILP (Vdebug_on_signal
)) /* This says call debugger even if
1385 there is a handler. */
1387 int count
= specpdl_ptr
- specpdl
;
1388 int debugger_called
= 0;
1389 Lisp_Object sig_symbol
, combined_data
;
1393 combined_data
= data
;
1394 sig_symbol
= Fcar (data
);
1398 combined_data
= Fcons (sig
, data
);
1402 if (wants_debugger (Vstack_trace_on_error
, conditions
))
1403 internal_with_output_to_temp_buffer ("*Backtrace*", Fbacktrace
, Qnil
);
1404 if ((EQ (sig_symbol
, Qquit
)
1406 : wants_debugger (Vdebug_on_error
, conditions
))
1407 && ! skip_debugger (conditions
, combined_data
)
1408 && when_entered_debugger
< num_nonmacro_input_events
)
1410 specbind (Qdebug_on_error
, Qnil
);
1412 = call_debugger (Fcons (Qerror
,
1413 Fcons (combined_data
, Qnil
)));
1414 debugger_called
= 1;
1416 /* If there is no handler, return saying whether we ran the debugger. */
1417 if (EQ (handlers
, Qerror
))
1419 if (debugger_called
)
1420 return unbind_to (count
, Qlambda
);
1424 for (h
= handlers
; CONSP (h
); h
= Fcdr (h
))
1426 Lisp_Object handler
, condit
;
1429 if (!CONSP (handler
))
1431 condit
= Fcar (handler
);
1432 /* Handle a single condition name in handler HANDLER. */
1433 if (SYMBOLP (condit
))
1435 tem
= Fmemq (Fcar (handler
), conditions
);
1439 /* Handle a list of condition names in handler HANDLER. */
1440 else if (CONSP (condit
))
1442 while (CONSP (condit
))
1444 tem
= Fmemq (Fcar (condit
), conditions
);
1447 condit
= XCONS (condit
)->cdr
;
1454 /* dump an error message; called like printf */
1458 error (m
, a1
, a2
, a3
)
1478 int used
= doprnt (buf
, size
, m
, m
+ mlen
, 3, args
);
1483 buffer
= (char *) xrealloc (buffer
, size
);
1486 buffer
= (char *) xmalloc (size
);
1491 string
= build_string (buf
);
1495 Fsignal (Qerror
, Fcons (string
, Qnil
));
1498 DEFUN ("commandp", Fcommandp
, Scommandp
, 1, 1, 0,
1499 "T if FUNCTION makes provisions for interactive calling.\n\
1500 This means it contains a description for how to read arguments to give it.\n\
1501 The value is nil for an invalid function or a symbol with no function\n\
1504 Interactively callable functions include strings and vectors (treated\n\
1505 as keyboard macros), lambda-expressions that contain a top-level call\n\
1506 to `interactive', autoload definitions made by `autoload' with non-nil\n\
1507 fourth argument, and some of the built-in functions of Lisp.\n\
1509 Also, a symbol satisfies `commandp' if its function definition does so.")
1511 Lisp_Object function
;
1513 register Lisp_Object fun
;
1514 register Lisp_Object funcar
;
1515 register Lisp_Object tem
;
1520 fun
= indirect_function (fun
);
1521 if (EQ (fun
, Qunbound
))
1524 /* Emacs primitives are interactive if their DEFUN specifies an
1525 interactive spec. */
1528 if (XSUBR (fun
)->prompt
)
1534 /* Bytecode objects are interactive if they are long enough to
1535 have an element whose index is COMPILED_INTERACTIVE, which is
1536 where the interactive spec is stored. */
1537 else if (COMPILEDP (fun
))
1538 return ((XVECTOR (fun
)->size
& PSEUDOVECTOR_SIZE_MASK
) > COMPILED_INTERACTIVE
1541 /* Strings and vectors are keyboard macros. */
1542 if (STRINGP (fun
) || VECTORP (fun
))
1545 /* Lists may represent commands. */
1548 funcar
= Fcar (fun
);
1549 if (!SYMBOLP (funcar
))
1550 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
1551 if (EQ (funcar
, Qlambda
))
1552 return Fassq (Qinteractive
, Fcdr (Fcdr (fun
)));
1553 if (EQ (funcar
, Qmocklisp
))
1554 return Qt
; /* All mocklisp functions can be called interactively */
1555 if (EQ (funcar
, Qautoload
))
1556 return Fcar (Fcdr (Fcdr (Fcdr (fun
))));
1562 DEFUN ("autoload", Fautoload
, Sautoload
, 2, 5, 0,
1563 "Define FUNCTION to autoload from FILE.\n\
1564 FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\
1565 Third arg DOCSTRING is documentation for the function.\n\
1566 Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\
1567 Fifth arg TYPE indicates the type of the object:\n\
1568 nil or omitted says FUNCTION is a function,\n\
1569 `keymap' says FUNCTION is really a keymap, and\n\
1570 `macro' or t says FUNCTION is really a macro.\n\
1571 Third through fifth args give info about the real definition.\n\
1572 They default to nil.\n\
1573 If FUNCTION is already defined other than as an autoload,\n\
1574 this does nothing and returns nil.")
1575 (function
, file
, docstring
, interactive
, type
)
1576 Lisp_Object function
, file
, docstring
, interactive
, type
;
1579 Lisp_Object args
[4];
1582 CHECK_SYMBOL (function
, 0);
1583 CHECK_STRING (file
, 1);
1585 /* If function is defined and not as an autoload, don't override */
1586 if (!EQ (XSYMBOL (function
)->function
, Qunbound
)
1587 && !(CONSP (XSYMBOL (function
)->function
)
1588 && EQ (XCONS (XSYMBOL (function
)->function
)->car
, Qautoload
)))
1593 args
[1] = docstring
;
1594 args
[2] = interactive
;
1597 return Ffset (function
, Fcons (Qautoload
, Flist (4, &args
[0])));
1598 #else /* NO_ARG_ARRAY */
1599 return Ffset (function
, Fcons (Qautoload
, Flist (4, &file
)));
1600 #endif /* not NO_ARG_ARRAY */
1604 un_autoload (oldqueue
)
1605 Lisp_Object oldqueue
;
1607 register Lisp_Object queue
, first
, second
;
1609 /* Queue to unwind is current value of Vautoload_queue.
1610 oldqueue is the shadowed value to leave in Vautoload_queue. */
1611 queue
= Vautoload_queue
;
1612 Vautoload_queue
= oldqueue
;
1613 while (CONSP (queue
))
1615 first
= Fcar (queue
);
1616 second
= Fcdr (first
);
1617 first
= Fcar (first
);
1618 if (EQ (second
, Qnil
))
1621 Ffset (first
, second
);
1622 queue
= Fcdr (queue
);
1627 /* Load an autoloaded function.
1628 FUNNAME is the symbol which is the function's name.
1629 FUNDEF is the autoload definition (a list). */
1632 do_autoload (fundef
, funname
)
1633 Lisp_Object fundef
, funname
;
1635 int count
= specpdl_ptr
- specpdl
;
1636 Lisp_Object fun
, val
, queue
, first
, second
;
1637 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1640 CHECK_SYMBOL (funname
, 0);
1641 GCPRO3 (fun
, funname
, fundef
);
1643 /* Value saved here is to be restored into Vautoload_queue */
1644 record_unwind_protect (un_autoload
, Vautoload_queue
);
1645 Vautoload_queue
= Qt
;
1646 Fload (Fcar (Fcdr (fundef
)), Qnil
, noninteractive
? Qt
: Qnil
, Qnil
, Qt
);
1648 /* Save the old autoloads, in case we ever do an unload. */
1649 queue
= Vautoload_queue
;
1650 while (CONSP (queue
))
1652 first
= Fcar (queue
);
1653 second
= Fcdr (first
);
1654 first
= Fcar (first
);
1656 /* Note: This test is subtle. The cdr of an autoload-queue entry
1657 may be an atom if the autoload entry was generated by a defalias
1660 Fput (first
, Qautoload
, (Fcdr (second
)));
1662 queue
= Fcdr (queue
);
1665 /* Once loading finishes, don't undo it. */
1666 Vautoload_queue
= Qt
;
1667 unbind_to (count
, Qnil
);
1669 fun
= Findirect_function (fun
);
1671 if (!NILP (Fequal (fun
, fundef
)))
1672 error ("Autoloading failed to define function %s",
1673 XSYMBOL (funname
)->name
->data
);
1677 DEFUN ("eval", Feval
, Seval
, 1, 1, 0,
1678 "Evaluate FORM and return its value.")
1682 Lisp_Object fun
, val
, original_fun
, original_args
;
1684 struct backtrace backtrace
;
1685 struct gcpro gcpro1
, gcpro2
, gcpro3
;
1689 if (EQ (Vmocklisp_arguments
, Qt
))
1690 return Fsymbol_value (form
);
1691 val
= Fsymbol_value (form
);
1693 XSETFASTINT (val
, 0);
1694 else if (EQ (val
, Qt
))
1695 XSETFASTINT (val
, 1);
1702 if (consing_since_gc
> gc_cons_threshold
)
1705 Fgarbage_collect ();
1709 if (++lisp_eval_depth
> max_lisp_eval_depth
)
1711 if (max_lisp_eval_depth
< 100)
1712 max_lisp_eval_depth
= 100;
1713 if (lisp_eval_depth
> max_lisp_eval_depth
)
1714 error ("Lisp nesting exceeds max-lisp-eval-depth");
1717 original_fun
= Fcar (form
);
1718 original_args
= Fcdr (form
);
1720 backtrace
.next
= backtrace_list
;
1721 backtrace_list
= &backtrace
;
1722 backtrace
.function
= &original_fun
; /* This also protects them from gc */
1723 backtrace
.args
= &original_args
;
1724 backtrace
.nargs
= UNEVALLED
;
1725 backtrace
.evalargs
= 1;
1726 backtrace
.debug_on_exit
= 0;
1728 if (debug_on_next_call
)
1729 do_debug_on_call (Qt
);
1731 /* At this point, only original_fun and original_args
1732 have values that will be used below */
1734 fun
= Findirect_function (original_fun
);
1738 Lisp_Object numargs
;
1739 Lisp_Object argvals
[8];
1740 Lisp_Object args_left
;
1741 register int i
, maxargs
;
1743 args_left
= original_args
;
1744 numargs
= Flength (args_left
);
1746 if (XINT (numargs
) < XSUBR (fun
)->min_args
||
1747 (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< XINT (numargs
)))
1748 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (numargs
, Qnil
)));
1750 if (XSUBR (fun
)->max_args
== UNEVALLED
)
1752 backtrace
.evalargs
= 0;
1753 val
= (*XSUBR (fun
)->function
) (args_left
);
1757 if (XSUBR (fun
)->max_args
== MANY
)
1759 /* Pass a vector of evaluated arguments */
1761 register int argnum
= 0;
1763 vals
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
1765 GCPRO3 (args_left
, fun
, fun
);
1769 while (!NILP (args_left
))
1771 vals
[argnum
++] = Feval (Fcar (args_left
));
1772 args_left
= Fcdr (args_left
);
1773 gcpro3
.nvars
= argnum
;
1776 backtrace
.args
= vals
;
1777 backtrace
.nargs
= XINT (numargs
);
1779 val
= (*XSUBR (fun
)->function
) (XINT (numargs
), vals
);
1784 GCPRO3 (args_left
, fun
, fun
);
1785 gcpro3
.var
= argvals
;
1788 maxargs
= XSUBR (fun
)->max_args
;
1789 for (i
= 0; i
< maxargs
; args_left
= Fcdr (args_left
))
1791 argvals
[i
] = Feval (Fcar (args_left
));
1797 backtrace
.args
= argvals
;
1798 backtrace
.nargs
= XINT (numargs
);
1803 val
= (*XSUBR (fun
)->function
) ();
1806 val
= (*XSUBR (fun
)->function
) (argvals
[0]);
1809 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1]);
1812 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
1816 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1],
1817 argvals
[2], argvals
[3]);
1820 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
1821 argvals
[3], argvals
[4]);
1824 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
1825 argvals
[3], argvals
[4], argvals
[5]);
1828 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
1829 argvals
[3], argvals
[4], argvals
[5],
1834 val
= (*XSUBR (fun
)->function
) (argvals
[0], argvals
[1], argvals
[2],
1835 argvals
[3], argvals
[4], argvals
[5],
1836 argvals
[6], argvals
[7]);
1840 /* Someone has created a subr that takes more arguments than
1841 is supported by this code. We need to either rewrite the
1842 subr to use a different argument protocol, or add more
1843 cases to this switch. */
1847 if (COMPILEDP (fun
))
1848 val
= apply_lambda (fun
, original_args
, 1);
1852 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
1853 funcar
= Fcar (fun
);
1854 if (!SYMBOLP (funcar
))
1855 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
1856 if (EQ (funcar
, Qautoload
))
1858 do_autoload (fun
, original_fun
);
1861 if (EQ (funcar
, Qmacro
))
1862 val
= Feval (apply1 (Fcdr (fun
), original_args
));
1863 else if (EQ (funcar
, Qlambda
))
1864 val
= apply_lambda (fun
, original_args
, 1);
1865 else if (EQ (funcar
, Qmocklisp
))
1866 val
= ml_apply (fun
, original_args
);
1868 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
1871 if (!EQ (Vmocklisp_arguments
, Qt
))
1874 XSETFASTINT (val
, 0);
1875 else if (EQ (val
, Qt
))
1876 XSETFASTINT (val
, 1);
1879 if (backtrace
.debug_on_exit
)
1880 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
1881 backtrace_list
= backtrace
.next
;
1885 DEFUN ("apply", Fapply
, Sapply
, 2, MANY
, 0,
1886 "Call FUNCTION with our remaining args, using our last arg as list of args.\n\
1887 Then return the value FUNCTION returns.\n\
1888 Thus, (apply '+ 1 2 '(3 4)) returns 10.")
1893 register int i
, numargs
;
1894 register Lisp_Object spread_arg
;
1895 register Lisp_Object
*funcall_args
;
1897 struct gcpro gcpro1
;
1901 spread_arg
= args
[nargs
- 1];
1902 CHECK_LIST (spread_arg
, nargs
);
1904 numargs
= XINT (Flength (spread_arg
));
1907 return Ffuncall (nargs
- 1, args
);
1908 else if (numargs
== 1)
1910 args
[nargs
- 1] = XCONS (spread_arg
)->car
;
1911 return Ffuncall (nargs
, args
);
1914 numargs
+= nargs
- 2;
1916 fun
= indirect_function (fun
);
1917 if (EQ (fun
, Qunbound
))
1919 /* Let funcall get the error */
1926 if (numargs
< XSUBR (fun
)->min_args
1927 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
1928 goto funcall
; /* Let funcall get the error */
1929 else if (XSUBR (fun
)->max_args
> numargs
)
1931 /* Avoid making funcall cons up a yet another new vector of arguments
1932 by explicitly supplying nil's for optional values */
1933 funcall_args
= (Lisp_Object
*) alloca ((1 + XSUBR (fun
)->max_args
)
1934 * sizeof (Lisp_Object
));
1935 for (i
= numargs
; i
< XSUBR (fun
)->max_args
;)
1936 funcall_args
[++i
] = Qnil
;
1937 GCPRO1 (*funcall_args
);
1938 gcpro1
.nvars
= 1 + XSUBR (fun
)->max_args
;
1942 /* We add 1 to numargs because funcall_args includes the
1943 function itself as well as its arguments. */
1946 funcall_args
= (Lisp_Object
*) alloca ((1 + numargs
)
1947 * sizeof (Lisp_Object
));
1948 GCPRO1 (*funcall_args
);
1949 gcpro1
.nvars
= 1 + numargs
;
1952 bcopy (args
, funcall_args
, nargs
* sizeof (Lisp_Object
));
1953 /* Spread the last arg we got. Its first element goes in
1954 the slot that it used to occupy, hence this value of I. */
1956 while (!NILP (spread_arg
))
1958 funcall_args
[i
++] = XCONS (spread_arg
)->car
;
1959 spread_arg
= XCONS (spread_arg
)->cdr
;
1962 RETURN_UNGCPRO (Ffuncall (gcpro1
.nvars
, funcall_args
));
1965 /* Run hook variables in various ways. */
1967 enum run_hooks_condition
{to_completion
, until_success
, until_failure
};
1969 DEFUN ("run-hooks", Frun_hooks
, Srun_hooks
, 1, MANY
, 0,
1970 "Run each hook in HOOKS. Major mode functions use this.\n\
1971 Each argument should be a symbol, a hook variable.\n\
1972 These symbols are processed in the order specified.\n\
1973 If a hook symbol has a non-nil value, that value may be a function\n\
1974 or a list of functions to be called to run the hook.\n\
1975 If the value is a function, it is called with no arguments.\n\
1976 If it is a list, the elements are called, in order, with no arguments.\n\
1978 To make a hook variable buffer-local, use `make-local-hook',\n\
1979 not `make-local-variable'.")
1984 Lisp_Object hook
[1];
1987 for (i
= 0; i
< nargs
; i
++)
1990 run_hook_with_args (1, hook
, to_completion
);
1996 DEFUN ("run-hook-with-args", Frun_hook_with_args
,
1997 Srun_hook_with_args
, 1, MANY
, 0,
1998 "Run HOOK with the specified arguments ARGS.\n\
1999 HOOK should be a symbol, a hook variable. If HOOK has a non-nil\n\
2000 value, that value may be a function or a list of functions to be\n\
2001 called to run the hook. If the value is a function, it is called with\n\
2002 the given arguments and its return value is returned. If it is a list\n\
2003 of functions, those functions are called, in order,\n\
2004 with the given arguments ARGS.\n\
2005 It is best not to depend on the value return by `run-hook-with-args',\n\
2006 as that may change.\n\
2008 To make a hook variable buffer-local, use `make-local-hook',\n\
2009 not `make-local-variable'.")
2014 return run_hook_with_args (nargs
, args
, to_completion
);
2017 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success
,
2018 Srun_hook_with_args_until_success
, 1, MANY
, 0,
2019 "Run HOOK with the specified arguments ARGS.\n\
2020 HOOK should be a symbol, a hook variable. Its value should\n\
2021 be a list of functions. We call those functions, one by one,\n\
2022 passing arguments ARGS to each of them, until one of them\n\
2023 returns a non-nil value. Then we return that value.\n\
2024 If all the functions return nil, we return nil.\n\
2026 To make a hook variable buffer-local, use `make-local-hook',\n\
2027 not `make-local-variable'.")
2032 return run_hook_with_args (nargs
, args
, until_success
);
2035 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure
,
2036 Srun_hook_with_args_until_failure
, 1, MANY
, 0,
2037 "Run HOOK with the specified arguments ARGS.\n\
2038 HOOK should be a symbol, a hook variable. Its value should\n\
2039 be a list of functions. We call those functions, one by one,\n\
2040 passing arguments ARGS to each of them, until one of them\n\
2041 returns nil. Then we return nil.\n\
2042 If all the functions return non-nil, we return non-nil.\n\
2044 To make a hook variable buffer-local, use `make-local-hook',\n\
2045 not `make-local-variable'.")
2050 return run_hook_with_args (nargs
, args
, until_failure
);
2053 /* ARGS[0] should be a hook symbol.
2054 Call each of the functions in the hook value, passing each of them
2055 as arguments all the rest of ARGS (all NARGS - 1 elements).
2056 COND specifies a condition to test after each call
2057 to decide whether to stop.
2058 The caller (or its caller, etc) must gcpro all of ARGS,
2059 except that it isn't necessary to gcpro ARGS[0]. */
2062 run_hook_with_args (nargs
, args
, cond
)
2065 enum run_hooks_condition cond
;
2067 Lisp_Object sym
, val
, ret
;
2068 struct gcpro gcpro1
, gcpro2
;
2070 /* If we are dying or still initializing,
2071 don't do anything--it would probably crash if we tried. */
2072 if (NILP (Vrun_hooks
))
2076 val
= find_symbol_value (sym
);
2077 ret
= (cond
== until_failure
? Qt
: Qnil
);
2079 if (EQ (val
, Qunbound
) || NILP (val
))
2081 else if (!CONSP (val
) || EQ (XCONS (val
)->car
, Qlambda
))
2084 return Ffuncall (nargs
, args
);
2091 CONSP (val
) && ((cond
== to_completion
)
2092 || (cond
== until_success
? NILP (ret
)
2094 val
= XCONS (val
)->cdr
)
2096 if (EQ (XCONS (val
)->car
, Qt
))
2098 /* t indicates this hook has a local binding;
2099 it means to run the global binding too. */
2100 Lisp_Object globals
;
2102 for (globals
= Fdefault_value (sym
);
2103 CONSP (globals
) && ((cond
== to_completion
)
2104 || (cond
== until_success
? NILP (ret
)
2106 globals
= XCONS (globals
)->cdr
)
2108 args
[0] = XCONS (globals
)->car
;
2109 /* In a global value, t should not occur. If it does, we
2110 must ignore it to avoid an endless loop. */
2111 if (!EQ (args
[0], Qt
))
2112 ret
= Ffuncall (nargs
, args
);
2117 args
[0] = XCONS (val
)->car
;
2118 ret
= Ffuncall (nargs
, args
);
2127 /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual
2128 present value of that symbol.
2129 Call each element of FUNLIST,
2130 passing each of them the rest of ARGS.
2131 The caller (or its caller, etc) must gcpro all of ARGS,
2132 except that it isn't necessary to gcpro ARGS[0]. */
2135 run_hook_list_with_args (funlist
, nargs
, args
)
2136 Lisp_Object funlist
;
2142 struct gcpro gcpro1
, gcpro2
;
2147 for (val
= funlist
; CONSP (val
); val
= XCONS (val
)->cdr
)
2149 if (EQ (XCONS (val
)->car
, Qt
))
2151 /* t indicates this hook has a local binding;
2152 it means to run the global binding too. */
2153 Lisp_Object globals
;
2155 for (globals
= Fdefault_value (sym
);
2157 globals
= XCONS (globals
)->cdr
)
2159 args
[0] = XCONS (globals
)->car
;
2160 /* In a global value, t should not occur. If it does, we
2161 must ignore it to avoid an endless loop. */
2162 if (!EQ (args
[0], Qt
))
2163 Ffuncall (nargs
, args
);
2168 args
[0] = XCONS (val
)->car
;
2169 Ffuncall (nargs
, args
);
2176 /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
2179 run_hook_with_args_2 (hook
, arg1
, arg2
)
2180 Lisp_Object hook
, arg1
, arg2
;
2182 Lisp_Object temp
[3];
2187 Frun_hook_with_args (3, temp
);
2190 /* Apply fn to arg */
2193 Lisp_Object fn
, arg
;
2195 struct gcpro gcpro1
;
2199 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2203 Lisp_Object args
[2];
2207 RETURN_UNGCPRO (Fapply (2, args
));
2209 #else /* not NO_ARG_ARRAY */
2210 RETURN_UNGCPRO (Fapply (2, &fn
));
2211 #endif /* not NO_ARG_ARRAY */
2214 /* Call function fn on no arguments */
2219 struct gcpro gcpro1
;
2222 RETURN_UNGCPRO (Ffuncall (1, &fn
));
2225 /* Call function fn with 1 argument arg1 */
2229 Lisp_Object fn
, arg1
;
2231 struct gcpro gcpro1
;
2233 Lisp_Object args
[2];
2239 RETURN_UNGCPRO (Ffuncall (2, args
));
2240 #else /* not NO_ARG_ARRAY */
2243 RETURN_UNGCPRO (Ffuncall (2, &fn
));
2244 #endif /* not NO_ARG_ARRAY */
2247 /* Call function fn with 2 arguments arg1, arg2 */
2250 call2 (fn
, arg1
, arg2
)
2251 Lisp_Object fn
, arg1
, arg2
;
2253 struct gcpro gcpro1
;
2255 Lisp_Object args
[3];
2261 RETURN_UNGCPRO (Ffuncall (3, args
));
2262 #else /* not NO_ARG_ARRAY */
2265 RETURN_UNGCPRO (Ffuncall (3, &fn
));
2266 #endif /* not NO_ARG_ARRAY */
2269 /* Call function fn with 3 arguments arg1, arg2, arg3 */
2272 call3 (fn
, arg1
, arg2
, arg3
)
2273 Lisp_Object fn
, arg1
, arg2
, arg3
;
2275 struct gcpro gcpro1
;
2277 Lisp_Object args
[4];
2284 RETURN_UNGCPRO (Ffuncall (4, args
));
2285 #else /* not NO_ARG_ARRAY */
2288 RETURN_UNGCPRO (Ffuncall (4, &fn
));
2289 #endif /* not NO_ARG_ARRAY */
2292 /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */
2295 call4 (fn
, arg1
, arg2
, arg3
, arg4
)
2296 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
;
2298 struct gcpro gcpro1
;
2300 Lisp_Object args
[5];
2308 RETURN_UNGCPRO (Ffuncall (5, args
));
2309 #else /* not NO_ARG_ARRAY */
2312 RETURN_UNGCPRO (Ffuncall (5, &fn
));
2313 #endif /* not NO_ARG_ARRAY */
2316 /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */
2319 call5 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
)
2320 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
;
2322 struct gcpro gcpro1
;
2324 Lisp_Object args
[6];
2333 RETURN_UNGCPRO (Ffuncall (6, args
));
2334 #else /* not NO_ARG_ARRAY */
2337 RETURN_UNGCPRO (Ffuncall (6, &fn
));
2338 #endif /* not NO_ARG_ARRAY */
2341 /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */
2344 call6 (fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
)
2345 Lisp_Object fn
, arg1
, arg2
, arg3
, arg4
, arg5
, arg6
;
2347 struct gcpro gcpro1
;
2349 Lisp_Object args
[7];
2359 RETURN_UNGCPRO (Ffuncall (7, args
));
2360 #else /* not NO_ARG_ARRAY */
2363 RETURN_UNGCPRO (Ffuncall (7, &fn
));
2364 #endif /* not NO_ARG_ARRAY */
2367 DEFUN ("funcall", Ffuncall
, Sfuncall
, 1, MANY
, 0,
2368 "Call first argument as a function, passing remaining arguments to it.\n\
2369 Return the value that function returns.\n\
2370 Thus, (funcall 'cons 'x 'y) returns (x . y).")
2377 int numargs
= nargs
- 1;
2378 Lisp_Object lisp_numargs
;
2380 struct backtrace backtrace
;
2381 register Lisp_Object
*internal_args
;
2385 if (consing_since_gc
> gc_cons_threshold
)
2386 Fgarbage_collect ();
2388 if (++lisp_eval_depth
> max_lisp_eval_depth
)
2390 if (max_lisp_eval_depth
< 100)
2391 max_lisp_eval_depth
= 100;
2392 if (lisp_eval_depth
> max_lisp_eval_depth
)
2393 error ("Lisp nesting exceeds max-lisp-eval-depth");
2396 backtrace
.next
= backtrace_list
;
2397 backtrace_list
= &backtrace
;
2398 backtrace
.function
= &args
[0];
2399 backtrace
.args
= &args
[1];
2400 backtrace
.nargs
= nargs
- 1;
2401 backtrace
.evalargs
= 0;
2402 backtrace
.debug_on_exit
= 0;
2404 if (debug_on_next_call
)
2405 do_debug_on_call (Qlambda
);
2411 fun
= Findirect_function (fun
);
2415 if (numargs
< XSUBR (fun
)->min_args
2416 || (XSUBR (fun
)->max_args
>= 0 && XSUBR (fun
)->max_args
< numargs
))
2418 XSETFASTINT (lisp_numargs
, numargs
);
2419 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (lisp_numargs
, Qnil
)));
2422 if (XSUBR (fun
)->max_args
== UNEVALLED
)
2423 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2425 if (XSUBR (fun
)->max_args
== MANY
)
2427 val
= (*XSUBR (fun
)->function
) (numargs
, args
+ 1);
2431 if (XSUBR (fun
)->max_args
> numargs
)
2433 internal_args
= (Lisp_Object
*) alloca (XSUBR (fun
)->max_args
* sizeof (Lisp_Object
));
2434 bcopy (args
+ 1, internal_args
, numargs
* sizeof (Lisp_Object
));
2435 for (i
= numargs
; i
< XSUBR (fun
)->max_args
; i
++)
2436 internal_args
[i
] = Qnil
;
2439 internal_args
= args
+ 1;
2440 switch (XSUBR (fun
)->max_args
)
2443 val
= (*XSUBR (fun
)->function
) ();
2446 val
= (*XSUBR (fun
)->function
) (internal_args
[0]);
2449 val
= (*XSUBR (fun
)->function
) (internal_args
[0],
2453 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2457 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2462 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2463 internal_args
[2], internal_args
[3],
2467 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2468 internal_args
[2], internal_args
[3],
2469 internal_args
[4], internal_args
[5]);
2472 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2473 internal_args
[2], internal_args
[3],
2474 internal_args
[4], internal_args
[5],
2479 val
= (*XSUBR (fun
)->function
) (internal_args
[0], internal_args
[1],
2480 internal_args
[2], internal_args
[3],
2481 internal_args
[4], internal_args
[5],
2482 internal_args
[6], internal_args
[7]);
2487 /* If a subr takes more than 8 arguments without using MANY
2488 or UNEVALLED, we need to extend this function to support it.
2489 Until this is done, there is no way to call the function. */
2493 if (COMPILEDP (fun
))
2494 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2498 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2499 funcar
= Fcar (fun
);
2500 if (!SYMBOLP (funcar
))
2501 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2502 if (EQ (funcar
, Qlambda
))
2503 val
= funcall_lambda (fun
, numargs
, args
+ 1);
2504 else if (EQ (funcar
, Qmocklisp
))
2505 val
= ml_apply (fun
, Flist (numargs
, args
+ 1));
2506 else if (EQ (funcar
, Qautoload
))
2508 do_autoload (fun
, args
[0]);
2512 return Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2516 if (backtrace
.debug_on_exit
)
2517 val
= call_debugger (Fcons (Qexit
, Fcons (val
, Qnil
)));
2518 backtrace_list
= backtrace
.next
;
2523 apply_lambda (fun
, args
, eval_flag
)
2524 Lisp_Object fun
, args
;
2527 Lisp_Object args_left
;
2528 Lisp_Object numargs
;
2529 register Lisp_Object
*arg_vector
;
2530 struct gcpro gcpro1
, gcpro2
, gcpro3
;
2532 register Lisp_Object tem
;
2534 numargs
= Flength (args
);
2535 arg_vector
= (Lisp_Object
*) alloca (XINT (numargs
) * sizeof (Lisp_Object
));
2538 GCPRO3 (*arg_vector
, args_left
, fun
);
2541 for (i
= 0; i
< XINT (numargs
);)
2543 tem
= Fcar (args_left
), args_left
= Fcdr (args_left
);
2544 if (eval_flag
) tem
= Feval (tem
);
2545 arg_vector
[i
++] = tem
;
2553 backtrace_list
->args
= arg_vector
;
2554 backtrace_list
->nargs
= i
;
2556 backtrace_list
->evalargs
= 0;
2557 tem
= funcall_lambda (fun
, XINT (numargs
), arg_vector
);
2559 /* Do the debug-on-exit now, while arg_vector still exists. */
2560 if (backtrace_list
->debug_on_exit
)
2561 tem
= call_debugger (Fcons (Qexit
, Fcons (tem
, Qnil
)));
2562 /* Don't do it again when we return to eval. */
2563 backtrace_list
->debug_on_exit
= 0;
2567 /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
2568 and return the result of evaluation.
2569 FUN must be either a lambda-expression or a compiled-code object. */
2572 funcall_lambda (fun
, nargs
, arg_vector
)
2575 register Lisp_Object
*arg_vector
;
2577 Lisp_Object val
, tem
;
2578 register Lisp_Object syms_left
;
2579 Lisp_Object numargs
;
2580 register Lisp_Object next
;
2581 int count
= specpdl_ptr
- specpdl
;
2583 int optional
= 0, rest
= 0;
2585 specbind (Qmocklisp_arguments
, Qt
); /* t means NOT mocklisp! */
2587 XSETFASTINT (numargs
, nargs
);
2590 syms_left
= Fcar (Fcdr (fun
));
2591 else if (COMPILEDP (fun
))
2592 syms_left
= XVECTOR (fun
)->contents
[COMPILED_ARGLIST
];
2596 for (; !NILP (syms_left
); syms_left
= Fcdr (syms_left
))
2599 next
= Fcar (syms_left
);
2600 while (!SYMBOLP (next
))
2601 next
= Fsignal (Qinvalid_function
, Fcons (fun
, Qnil
));
2602 if (EQ (next
, Qand_rest
))
2604 else if (EQ (next
, Qand_optional
))
2608 specbind (next
, Flist (nargs
- i
, &arg_vector
[i
]));
2613 tem
= arg_vector
[i
++];
2614 specbind (next
, tem
);
2617 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (numargs
, Qnil
)));
2619 specbind (next
, Qnil
);
2623 return Fsignal (Qwrong_number_of_arguments
, Fcons (fun
, Fcons (numargs
, Qnil
)));
2626 val
= Fprogn (Fcdr (Fcdr (fun
)));
2629 /* If we have not actually read the bytecode string
2630 and constants vector yet, fetch them from the file. */
2631 if (CONSP (XVECTOR (fun
)->contents
[COMPILED_BYTECODE
]))
2632 Ffetch_bytecode (fun
);
2633 val
= Fbyte_code (XVECTOR (fun
)->contents
[COMPILED_BYTECODE
],
2634 XVECTOR (fun
)->contents
[COMPILED_CONSTANTS
],
2635 XVECTOR (fun
)->contents
[COMPILED_STACK_DEPTH
]);
2637 return unbind_to (count
, val
);
2640 DEFUN ("fetch-bytecode", Ffetch_bytecode
, Sfetch_bytecode
,
2642 "If byte-compiled OBJECT is lazy-loaded, fetch it now.")
2648 if (COMPILEDP (object
)
2649 && CONSP (XVECTOR (object
)->contents
[COMPILED_BYTECODE
]))
2651 tem
= read_doc_string (XVECTOR (object
)->contents
[COMPILED_BYTECODE
]);
2653 error ("invalid byte code");
2654 XVECTOR (object
)->contents
[COMPILED_BYTECODE
] = XCONS (tem
)->car
;
2655 XVECTOR (object
)->contents
[COMPILED_CONSTANTS
] = XCONS (tem
)->cdr
;
2663 register int count
= specpdl_ptr
- specpdl
;
2664 if (specpdl_size
>= max_specpdl_size
)
2666 if (max_specpdl_size
< 400)
2667 max_specpdl_size
= 400;
2668 if (specpdl_size
>= max_specpdl_size
)
2670 if (!NILP (Vdebug_on_error
))
2671 /* Leave room for some specpdl in the debugger. */
2672 max_specpdl_size
= specpdl_size
+ 100;
2674 Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil
));
2678 if (specpdl_size
> max_specpdl_size
)
2679 specpdl_size
= max_specpdl_size
;
2680 specpdl
= (struct specbinding
*) xrealloc (specpdl
, specpdl_size
* sizeof (struct specbinding
));
2681 specpdl_ptr
= specpdl
+ count
;
2685 specbind (symbol
, value
)
2686 Lisp_Object symbol
, value
;
2690 CHECK_SYMBOL (symbol
, 0);
2692 if (specpdl_ptr
== specpdl
+ specpdl_size
)
2694 specpdl_ptr
->symbol
= symbol
;
2695 specpdl_ptr
->func
= 0;
2696 specpdl_ptr
->old_value
= ovalue
= find_symbol_value (symbol
);
2698 if (BUFFER_OBJFWDP (ovalue
) || KBOARD_OBJFWDP (ovalue
))
2699 store_symval_forwarding (symbol
, ovalue
, value
);
2701 set_internal (symbol
, value
, 1);
2705 record_unwind_protect (function
, arg
)
2706 Lisp_Object (*function
) P_ ((Lisp_Object
));
2709 if (specpdl_ptr
== specpdl
+ specpdl_size
)
2711 specpdl_ptr
->func
= function
;
2712 specpdl_ptr
->symbol
= Qnil
;
2713 specpdl_ptr
->old_value
= arg
;
2718 unbind_to (count
, value
)
2722 int quitf
= !NILP (Vquit_flag
);
2723 struct gcpro gcpro1
;
2729 while (specpdl_ptr
!= specpdl
+ count
)
2732 if (specpdl_ptr
->func
!= 0)
2733 (*specpdl_ptr
->func
) (specpdl_ptr
->old_value
);
2734 /* Note that a "binding" of nil is really an unwind protect,
2735 so in that case the "old value" is a list of forms to evaluate. */
2736 else if (NILP (specpdl_ptr
->symbol
))
2737 Fprogn (specpdl_ptr
->old_value
);
2739 set_internal (specpdl_ptr
->symbol
, specpdl_ptr
->old_value
, 1);
2741 if (NILP (Vquit_flag
) && quitf
) Vquit_flag
= Qt
;
2750 /* Get the value of symbol's global binding, even if that binding
2751 is not now dynamically visible. */
2754 top_level_value (symbol
)
2757 register struct specbinding
*ptr
= specpdl
;
2759 CHECK_SYMBOL (symbol
, 0);
2760 for (; ptr
!= specpdl_ptr
; ptr
++)
2762 if (EQ (ptr
->symbol
, symbol
))
2763 return ptr
->old_value
;
2765 return Fsymbol_value (symbol
);
2769 top_level_set (symbol
, newval
)
2770 Lisp_Object symbol
, newval
;
2772 register struct specbinding
*ptr
= specpdl
;
2774 CHECK_SYMBOL (symbol
, 0);
2775 for (; ptr
!= specpdl_ptr
; ptr
++)
2777 if (EQ (ptr
->symbol
, symbol
))
2779 ptr
->old_value
= newval
;
2783 return Fset (symbol
, newval
);
2788 DEFUN ("backtrace-debug", Fbacktrace_debug
, Sbacktrace_debug
, 2, 2, 0,
2789 "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\
2790 The debugger is entered when that frame exits, if the flag is non-nil.")
2792 Lisp_Object level
, flag
;
2794 register struct backtrace
*backlist
= backtrace_list
;
2797 CHECK_NUMBER (level
, 0);
2799 for (i
= 0; backlist
&& i
< XINT (level
); i
++)
2801 backlist
= backlist
->next
;
2805 backlist
->debug_on_exit
= !NILP (flag
);
2810 DEFUN ("backtrace", Fbacktrace
, Sbacktrace
, 0, 0, "",
2811 "Print a trace of Lisp function calls currently active.\n\
2812 Output stream used is value of `standard-output'.")
2815 register struct backtrace
*backlist
= backtrace_list
;
2819 extern Lisp_Object Vprint_level
;
2820 struct gcpro gcpro1
;
2822 XSETFASTINT (Vprint_level
, 3);
2829 write_string (backlist
->debug_on_exit
? "* " : " ", 2);
2830 if (backlist
->nargs
== UNEVALLED
)
2832 Fprin1 (Fcons (*backlist
->function
, *backlist
->args
), Qnil
);
2833 write_string ("\n", -1);
2837 tem
= *backlist
->function
;
2838 Fprin1 (tem
, Qnil
); /* This can QUIT */
2839 write_string ("(", -1);
2840 if (backlist
->nargs
== MANY
)
2842 for (tail
= *backlist
->args
, i
= 0;
2844 tail
= Fcdr (tail
), i
++)
2846 if (i
) write_string (" ", -1);
2847 Fprin1 (Fcar (tail
), Qnil
);
2852 for (i
= 0; i
< backlist
->nargs
; i
++)
2854 if (i
) write_string (" ", -1);
2855 Fprin1 (backlist
->args
[i
], Qnil
);
2858 write_string (")\n", -1);
2860 backlist
= backlist
->next
;
2863 Vprint_level
= Qnil
;
2868 DEFUN ("backtrace-frame", Fbacktrace_frame
, Sbacktrace_frame
, 1, 1, "",
2869 "Return the function and arguments NFRAMES up from current execution point.\n\
2870 If that frame has not evaluated the arguments yet (or is a special form),\n\
2871 the value is (nil FUNCTION ARG-FORMS...).\n\
2872 If that frame has evaluated its arguments and called its function already,\n\
2873 the value is (t FUNCTION ARG-VALUES...).\n\
2874 A &rest arg is represented as the tail of the list ARG-VALUES.\n\
2875 FUNCTION is whatever was supplied as car of evaluated list,\n\
2876 or a lambda expression for macro calls.\n\
2877 If NFRAMES is more than the number of frames, the value is nil.")
2879 Lisp_Object nframes
;
2881 register struct backtrace
*backlist
= backtrace_list
;
2885 CHECK_NATNUM (nframes
, 0);
2887 /* Find the frame requested. */
2888 for (i
= 0; backlist
&& i
< XFASTINT (nframes
); i
++)
2889 backlist
= backlist
->next
;
2893 if (backlist
->nargs
== UNEVALLED
)
2894 return Fcons (Qnil
, Fcons (*backlist
->function
, *backlist
->args
));
2897 if (backlist
->nargs
== MANY
)
2898 tem
= *backlist
->args
;
2900 tem
= Flist (backlist
->nargs
, backlist
->args
);
2902 return Fcons (Qt
, Fcons (*backlist
->function
, tem
));
2909 DEFVAR_INT ("max-specpdl-size", &max_specpdl_size
,
2910 "*Limit on number of Lisp variable bindings & unwind-protects.\n\
2911 If Lisp code tries to make more than this many at once,\n\
2912 an error is signaled.");
2914 DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth
,
2915 "*Limit on depth in `eval', `apply' and `funcall' before error.\n\
2916 This limit is to catch infinite recursions for you before they cause\n\
2917 actual stack overflow in C, which would be fatal for Emacs.\n\
2918 You can safely make it considerably larger than its default value,\n\
2919 if that proves inconveniently small.");
2921 DEFVAR_LISP ("quit-flag", &Vquit_flag
,
2922 "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\
2923 Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'.");
2926 DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit
,
2927 "Non-nil inhibits C-g quitting from happening immediately.\n\
2928 Note that `quit-flag' will still be set by typing C-g,\n\
2929 so a quit will be signaled as soon as `inhibit-quit' is nil.\n\
2930 To prevent this happening, set `quit-flag' to nil\n\
2931 before making `inhibit-quit' nil.");
2932 Vinhibit_quit
= Qnil
;
2934 Qinhibit_quit
= intern ("inhibit-quit");
2935 staticpro (&Qinhibit_quit
);
2937 Qautoload
= intern ("autoload");
2938 staticpro (&Qautoload
);
2940 Qdebug_on_error
= intern ("debug-on-error");
2941 staticpro (&Qdebug_on_error
);
2943 Qmacro
= intern ("macro");
2944 staticpro (&Qmacro
);
2946 /* Note that the process handling also uses Qexit, but we don't want
2947 to staticpro it twice, so we just do it here. */
2948 Qexit
= intern ("exit");
2951 Qinteractive
= intern ("interactive");
2952 staticpro (&Qinteractive
);
2954 Qcommandp
= intern ("commandp");
2955 staticpro (&Qcommandp
);
2957 Qdefun
= intern ("defun");
2958 staticpro (&Qdefun
);
2960 Qand_rest
= intern ("&rest");
2961 staticpro (&Qand_rest
);
2963 Qand_optional
= intern ("&optional");
2964 staticpro (&Qand_optional
);
2966 DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error
,
2967 "*Non-nil means automatically display a backtrace buffer\n\
2968 after any error that is handled by the editor command loop.\n\
2969 If the value is a list, an error only means to display a backtrace\n\
2970 if one of its condition symbols appears in the list.");
2971 Vstack_trace_on_error
= Qnil
;
2973 DEFVAR_LISP ("debug-on-error", &Vdebug_on_error
,
2974 "*Non-nil means enter debugger if an error is signaled.\n\
2975 Does not apply to errors handled by `condition-case'.\n\
2976 If the value is a list, an error only means to enter the debugger\n\
2977 if one of its condition symbols appears in the list.\n\
2978 See also variable `debug-on-quit'.");
2979 Vdebug_on_error
= Qnil
;
2981 DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors
,
2982 "*List of errors for which the debugger should not be called.\n\
2983 Each element may be a condition-name or a regexp that matches error messages.\n\
2984 If any element applies to a given error, that error skips the debugger\n\
2985 and just returns to top level.\n\
2986 This overrides the variable `debug-on-error'.\n\
2987 It does not apply to errors handled by `condition-case'.");
2988 Vdebug_ignored_errors
= Qnil
;
2990 DEFVAR_BOOL ("debug-on-quit", &debug_on_quit
,
2991 "*Non-nil means enter debugger if quit is signaled (C-g, for example).\n\
2992 Does not apply if quit is handled by a `condition-case'.");
2995 DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call
,
2996 "Non-nil means enter debugger before next `eval', `apply' or `funcall'.");
2998 DEFVAR_LISP ("debugger", &Vdebugger
,
2999 "Function to call to invoke debugger.\n\
3000 If due to frame exit, args are `exit' and the value being returned;\n\
3001 this function's value will be returned instead of that.\n\
3002 If due to error, args are `error' and a list of the args to `signal'.\n\
3003 If due to `apply' or `funcall' entry, one arg, `lambda'.\n\
3004 If due to `eval' entry, one arg, t.");
3007 DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function
,
3008 "If non-nil, this is a function for `signal' to call.\n\
3009 It receives the same arguments that `signal' was given.\n\
3010 The Edebug package uses this to regain control.");
3011 Vsignal_hook_function
= Qnil
;
3013 Qmocklisp_arguments
= intern ("mocklisp-arguments");
3014 staticpro (&Qmocklisp_arguments
);
3015 DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments
,
3016 "While in a mocklisp function, the list of its unevaluated args.");
3017 Vmocklisp_arguments
= Qt
;
3019 DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal
,
3020 "*Non-nil means call the debugger regardless of condition handlers.\n\
3021 Note that `debug-on-error', `debug-on-quit' and friends\n\
3022 still determine whether to handle the particular condition.");
3023 Vdebug_on_signal
= Qnil
;
3025 Vrun_hooks
= intern ("run-hooks");
3026 staticpro (&Vrun_hooks
);
3028 staticpro (&Vautoload_queue
);
3029 Vautoload_queue
= Qnil
;
3040 defsubr (&Sfunction
);
3042 defsubr (&Sdefmacro
);
3044 defsubr (&Sdefconst
);
3045 defsubr (&Suser_variable_p
);
3049 defsubr (&Smacroexpand
);
3052 defsubr (&Sunwind_protect
);
3053 defsubr (&Scondition_case
);
3055 defsubr (&Sinteractive_p
);
3056 defsubr (&Scommandp
);
3057 defsubr (&Sautoload
);
3060 defsubr (&Sfuncall
);
3061 defsubr (&Srun_hooks
);
3062 defsubr (&Srun_hook_with_args
);
3063 defsubr (&Srun_hook_with_args_until_success
);
3064 defsubr (&Srun_hook_with_args_until_failure
);
3065 defsubr (&Sfetch_bytecode
);
3066 defsubr (&Sbacktrace_debug
);
3067 defsubr (&Sbacktrace
);
3068 defsubr (&Sbacktrace_frame
);