[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Emacs-diffs] Changes to emacs/src/eval.c [gnus-5_10-branch]
|
From: |
Miles Bader |
|
Subject: |
[Emacs-diffs] Changes to emacs/src/eval.c [gnus-5_10-branch] |
|
Date: |
Sat, 04 Sep 2004 08:24:45 -0400 |
Index: emacs/src/eval.c
diff -c /dev/null emacs/src/eval.c:1.220.2.1
*** /dev/null Sat Sep 4 12:03:27 2004
--- emacs/src/eval.c Sat Sep 4 12:01:17 2004
***************
*** 0 ****
--- 1,3468 ----
+ /* Evaluator for GNU Emacs Lisp interpreter.
+ Copyright (C) 1985, 86, 87, 93, 94, 95, 99, 2000, 2001, 02, 2004
+ Free Software Foundation, Inc.
+
+ This file is part of GNU Emacs.
+
+ GNU Emacs is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ GNU Emacs is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNU Emacs; see the file COPYING. If not, write to
+ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+
+ #include <config.h>
+ #include "lisp.h"
+ #include "blockinput.h"
+ #include "commands.h"
+ #include "keyboard.h"
+ #include "dispextern.h"
+ #include <setjmp.h>
+
+ /* This definition is duplicated in alloc.c and keyboard.c */
+ /* Putting it in lisp.h makes cc bomb out! */
+
+ struct backtrace
+ {
+ struct backtrace *next;
+ Lisp_Object *function;
+ Lisp_Object *args; /* Points to vector of args. */
+ int nargs; /* Length of vector.
+ If nargs is UNEVALLED, args points to slot holding
+ list of unevalled args */
+ char evalargs;
+ /* Nonzero means call value of debugger when done with this operation. */
+ char debug_on_exit;
+ };
+
+ struct backtrace *backtrace_list;
+
+ /* This structure helps implement the `catch' and `throw' control
+ structure. A struct catchtag contains all the information needed
+ to restore the state of the interpreter after a non-local jump.
+
+ Handlers for error conditions (represented by `struct handler'
+ structures) just point to a catch tag to do the cleanup required
+ for their jumps.
+
+ catchtag structures are chained together in the C calling stack;
+ the `next' member points to the next outer catchtag.
+
+ A call like (throw TAG VAL) searches for a catchtag whose `tag'
+ member is TAG, and then unbinds to it. The `val' member is used to
+ hold VAL while the stack is unwound; `val' is returned as the value
+ of the catch form.
+
+ All the other members are concerned with restoring the interpreter
+ state. */
+
+ struct catchtag
+ {
+ Lisp_Object tag;
+ Lisp_Object val;
+ struct catchtag *next;
+ struct gcpro *gcpro;
+ jmp_buf jmp;
+ struct backtrace *backlist;
+ struct handler *handlerlist;
+ int lisp_eval_depth;
+ int pdlcount;
+ int poll_suppress_count;
+ int interrupt_input_blocked;
+ struct byte_stack *byte_stack;
+ };
+
+ struct catchtag *catchlist;
+
+ #ifdef DEBUG_GCPRO
+ /* Count levels of GCPRO to detect failure to UNGCPRO. */
+ int gcpro_level;
+ #endif
+
+ Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun,
Qdefvar;
+ Lisp_Object Qinhibit_quit, Vinhibit_quit, Vquit_flag;
+ Lisp_Object Qand_rest, Qand_optional;
+ Lisp_Object Qdebug_on_error;
+ Lisp_Object Qdeclare;
+
+ /* This holds either the symbol `run-hooks' or nil.
+ It is nil at an early stage of startup, and when Emacs
+ is shutting down. */
+
+ Lisp_Object Vrun_hooks;
+
+ /* Non-nil means record all fset's and provide's, to be undone
+ if the file being autoloaded is not fully loaded.
+ They are recorded by being consed onto the front of Vautoload_queue:
+ (FUN . ODEF) for a defun, (OFEATURES . nil) for a provide. */
+
+ Lisp_Object Vautoload_queue;
+
+ /* Current number of specbindings allocated in specpdl. */
+
+ int specpdl_size;
+
+ /* Pointer to beginning of specpdl. */
+
+ struct specbinding *specpdl;
+
+ /* Pointer to first unused element in specpdl. */
+
+ volatile struct specbinding *specpdl_ptr;
+
+ /* Maximum size allowed for specpdl allocation */
+
+ EMACS_INT max_specpdl_size;
+
+ /* Depth in Lisp evaluations and function calls. */
+
+ int lisp_eval_depth;
+
+ /* Maximum allowed depth in Lisp evaluations and function calls. */
+
+ EMACS_INT max_lisp_eval_depth;
+
+ /* Nonzero means enter debugger before next function call */
+
+ int debug_on_next_call;
+
+ /* Non-zero means debugger may continue. This is zero when the
+ debugger is called during redisplay, where it might not be safe to
+ continue the interrupted redisplay. */
+
+ int debugger_may_continue;
+
+ /* List of conditions (non-nil atom means all) which cause a backtrace
+ if an error is handled by the command loop's error handler. */
+
+ Lisp_Object Vstack_trace_on_error;
+
+ /* List of conditions (non-nil atom means all) which enter the debugger
+ if an error is handled by the command loop's error handler. */
+
+ Lisp_Object Vdebug_on_error;
+
+ /* List of conditions and regexps specifying error messages which
+ do not enter the debugger even if Vdebug_on_error says they should. */
+
+ Lisp_Object Vdebug_ignored_errors;
+
+ /* Non-nil means call the debugger even if the error will be handled. */
+
+ Lisp_Object Vdebug_on_signal;
+
+ /* Hook for edebug to use. */
+
+ Lisp_Object Vsignal_hook_function;
+
+ /* Nonzero means enter debugger if a quit signal
+ is handled by the command loop's error handler. */
+
+ int debug_on_quit;
+
+ /* The value of num_nonmacro_input_events as of the last time we
+ started to enter the debugger. If we decide to enter the debugger
+ again when this is still equal to num_nonmacro_input_events, then we
+ know that the debugger itself has an error, and we should just
+ signal the error instead of entering an infinite loop of debugger
+ invocations. */
+
+ int when_entered_debugger;
+
+ Lisp_Object Vdebugger;
+
+ /* The function from which the last `signal' was called. Set in
+ Fsignal. */
+
+ Lisp_Object Vsignaling_function;
+
+ /* Set to non-zero while processing X events. Checked in Feval to
+ make sure the Lisp interpreter isn't called from a signal handler,
+ which is unsafe because the interpreter isn't reentrant. */
+
+ int handling_signal;
+
+ /* Function to process declarations in defmacro forms. */
+
+ Lisp_Object Vmacro_declaration_function;
+
+
+ static Lisp_Object funcall_lambda P_ ((Lisp_Object, int, Lisp_Object*));
+
+ void
+ init_eval_once ()
+ {
+ specpdl_size = 50;
+ specpdl = (struct specbinding *) xmalloc (specpdl_size * sizeof (struct
specbinding));
+ specpdl_ptr = specpdl;
+ max_specpdl_size = 600;
+ max_lisp_eval_depth = 300;
+
+ Vrun_hooks = Qnil;
+ }
+
+ void
+ init_eval ()
+ {
+ specpdl_ptr = specpdl;
+ catchlist = 0;
+ handlerlist = 0;
+ backtrace_list = 0;
+ Vquit_flag = Qnil;
+ debug_on_next_call = 0;
+ lisp_eval_depth = 0;
+ #ifdef DEBUG_GCPRO
+ gcpro_level = 0;
+ #endif
+ /* This is less than the initial value of num_nonmacro_input_events. */
+ when_entered_debugger = -1;
+ }
+
+ Lisp_Object
+ call_debugger (arg)
+ Lisp_Object arg;
+ {
+ int debug_while_redisplaying;
+ int count = SPECPDL_INDEX ();
+ Lisp_Object val;
+
+ if (lisp_eval_depth + 20 > max_lisp_eval_depth)
+ max_lisp_eval_depth = lisp_eval_depth + 20;
+
+ if (specpdl_size + 40 > max_specpdl_size)
+ max_specpdl_size = specpdl_size + 40;
+
+ #ifdef HAVE_X_WINDOWS
+ if (display_hourglass_p)
+ cancel_hourglass ();
+ #endif
+
+ debug_on_next_call = 0;
+ when_entered_debugger = num_nonmacro_input_events;
+
+ /* Resetting redisplaying_p to 0 makes sure that debug output is
+ displayed if the debugger is invoked during redisplay. */
+ debug_while_redisplaying = redisplaying_p;
+ redisplaying_p = 0;
+ specbind (intern ("debugger-may-continue"),
+ debug_while_redisplaying ? Qnil : Qt);
+ specbind (Qinhibit_redisplay, Qnil);
+
+ #if 0 /* Binding this prevents execution of Lisp code during
+ redisplay, which necessarily leads to display problems. */
+ specbind (Qinhibit_eval_during_redisplay, Qt);
+ #endif
+
+ val = apply1 (Vdebugger, arg);
+
+ /* Interrupting redisplay and resuming it later is not safe under
+ all circumstances. So, when the debugger returns, abort the
+ interrupted redisplay by going back to the top-level. */
+ if (debug_while_redisplaying)
+ Ftop_level ();
+
+ return unbind_to (count, val);
+ }
+
+ void
+ do_debug_on_call (code)
+ Lisp_Object code;
+ {
+ debug_on_next_call = 0;
+ backtrace_list->debug_on_exit = 1;
+ call_debugger (Fcons (code, Qnil));
+ }
+
+ /* NOTE!!! Every function that can call EVAL must protect its args
+ and temporaries from garbage collection while it needs them.
+ The definition of `For' shows what you have to do. */
+
+ DEFUN ("or", For, Sor, 0, UNEVALLED, 0,
+ doc: /* Eval args until one of them yields non-nil, then return that
value.
+ The remaining args are not evalled at all.
+ If all args return nil, return nil.
+ usage: (or CONDITIONS ...) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object val = Qnil;
+ struct gcpro gcpro1;
+
+ GCPRO1 (args);
+
+ while (CONSP (args))
+ {
+ val = Feval (XCAR (args));
+ if (!NILP (val))
+ break;
+ args = XCDR (args);
+ }
+
+ UNGCPRO;
+ return val;
+ }
+
+ DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0,
+ doc: /* Eval args until one of them yields nil, then return nil.
+ The remaining args are not evalled at all.
+ If no arg yields nil, return the last arg's value.
+ usage: (and CONDITIONS ...) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object val = Qt;
+ struct gcpro gcpro1;
+
+ GCPRO1 (args);
+
+ while (CONSP (args))
+ {
+ val = Feval (XCAR (args));
+ if (NILP (val))
+ break;
+ args = XCDR (args);
+ }
+
+ UNGCPRO;
+ return val;
+ }
+
+ DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0,
+ doc: /* If COND yields non-nil, do THEN, else do ELSE...
+ Returns the value of THEN or the value of the last of the ELSE's.
+ THEN must be one expression, but ELSE... can be zero or more expressions.
+ If COND yields nil, and there are no ELSE's, the value is nil.
+ usage: (if COND THEN ELSE...) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object cond;
+ struct gcpro gcpro1;
+
+ GCPRO1 (args);
+ cond = Feval (Fcar (args));
+ UNGCPRO;
+
+ if (!NILP (cond))
+ return Feval (Fcar (Fcdr (args)));
+ return Fprogn (Fcdr (Fcdr (args)));
+ }
+
+ DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0,
+ doc: /* Try each clause until one succeeds.
+ Each clause looks like (CONDITION BODY...). CONDITION is evaluated
+ and, if the value is non-nil, this clause succeeds:
+ then the expressions in BODY are evaluated and the last one's
+ value is the value of the cond-form.
+ If no clause succeeds, cond returns nil.
+ If a clause has one element, as in (CONDITION),
+ CONDITION's value if non-nil is returned from the cond-form.
+ usage: (cond CLAUSES...) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object clause, val;
+ struct gcpro gcpro1;
+
+ val = Qnil;
+ GCPRO1 (args);
+ while (!NILP (args))
+ {
+ clause = Fcar (args);
+ val = Feval (Fcar (clause));
+ if (!NILP (val))
+ {
+ if (!EQ (XCDR (clause), Qnil))
+ val = Fprogn (XCDR (clause));
+ break;
+ }
+ args = XCDR (args);
+ }
+ UNGCPRO;
+
+ return val;
+ }
+
+ DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0,
+ doc: /* Eval BODY forms sequentially and return value of last one.
+ usage: (progn BODY ...) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object val = Qnil;
+ struct gcpro gcpro1;
+
+ GCPRO1 (args);
+
+ while (CONSP (args))
+ {
+ val = Feval (XCAR (args));
+ args = XCDR (args);
+ }
+
+ UNGCPRO;
+ return val;
+ }
+
+ DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0,
+ doc: /* Eval FIRST and BODY sequentially; value from FIRST.
+ The value of FIRST is saved during the evaluation of the remaining args,
+ whose values are discarded.
+ usage: (prog1 FIRST BODY...) */)
+ (args)
+ Lisp_Object args;
+ {
+ Lisp_Object val;
+ register Lisp_Object args_left;
+ struct gcpro gcpro1, gcpro2;
+ register int argnum = 0;
+
+ if (NILP(args))
+ return Qnil;
+
+ args_left = args;
+ val = Qnil;
+ GCPRO2 (args, val);
+
+ do
+ {
+ if (!(argnum++))
+ val = Feval (Fcar (args_left));
+ else
+ Feval (Fcar (args_left));
+ args_left = Fcdr (args_left);
+ }
+ while (!NILP(args_left));
+
+ UNGCPRO;
+ return val;
+ }
+
+ DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0,
+ doc: /* Eval X, Y and BODY sequentially; value from Y.
+ The value of Y is saved during the evaluation of the remaining args,
+ whose values are discarded.
+ usage: (prog2 X Y BODY...) */)
+ (args)
+ Lisp_Object args;
+ {
+ Lisp_Object val;
+ register Lisp_Object args_left;
+ struct gcpro gcpro1, gcpro2;
+ register int argnum = -1;
+
+ val = Qnil;
+
+ if (NILP (args))
+ return Qnil;
+
+ args_left = args;
+ val = Qnil;
+ GCPRO2 (args, val);
+
+ do
+ {
+ if (!(argnum++))
+ val = Feval (Fcar (args_left));
+ else
+ Feval (Fcar (args_left));
+ args_left = Fcdr (args_left);
+ }
+ while (!NILP (args_left));
+
+ UNGCPRO;
+ return val;
+ }
+
+ DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0,
+ doc: /* Set each SYM to the value of its VAL.
+ The symbols SYM are variables; they are literal (not evaluated).
+ The values VAL are expressions; they are evaluated.
+ Thus, (setq x (1+ y)) sets `x' to the value of `(1+ y)'.
+ The second VAL is not computed until after the first SYM is set, and so on;
+ each VAL can use the new value of variables set earlier in the `setq'.
+ The return value of the `setq' form is the value of the last VAL.
+ usage: (setq SYM VAL SYM VAL ...) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object args_left;
+ register Lisp_Object val, sym;
+ struct gcpro gcpro1;
+
+ if (NILP(args))
+ return Qnil;
+
+ args_left = args;
+ GCPRO1 (args);
+
+ do
+ {
+ val = Feval (Fcar (Fcdr (args_left)));
+ sym = Fcar (args_left);
+ Fset (sym, val);
+ args_left = Fcdr (Fcdr (args_left));
+ }
+ while (!NILP(args_left));
+
+ UNGCPRO;
+ return val;
+ }
+
+ DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0,
+ doc: /* Return the argument, without evaluating it. `(quote x)'
yields `x'.
+ usage: (quote ARG) */)
+ (args)
+ Lisp_Object args;
+ {
+ return Fcar (args);
+ }
+
+ DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0,
+ doc: /* Like `quote', but preferred for objects which are functions.
+ In byte compilation, `function' causes its argument to be compiled.
+ `quote' cannot do that.
+ usage: (function ARG) */)
+ (args)
+ Lisp_Object args;
+ {
+ return Fcar (args);
+ }
+
+
+ DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0,
+ doc: /* Return t if function in which this appears was called
interactively.
+ This means that the function was called with call-interactively (which
+ includes being called as the binding of a key)
+ and input is currently coming from the keyboard (not in keyboard macro). */)
+ ()
+ {
+ return interactive_p (1) ? Qt : Qnil;
+ }
+
+
+ /* Return 1 if function in which this appears was called
+ interactively. This means that the function was called with
+ call-interactively (which includes being called as the binding of
+ a key) and input is currently coming from the keyboard (not in
+ keyboard macro).
+
+ EXCLUDE_SUBRS_P non-zero means always return 0 if the function
+ called is a built-in. */
+
+ int
+ interactive_p (exclude_subrs_p)
+ int exclude_subrs_p;
+ {
+ struct backtrace *btp;
+ Lisp_Object fun;
+
+ if (!INTERACTIVE)
+ return 0;
+
+ btp = backtrace_list;
+
+ /* If this isn't a byte-compiled function, there may be a frame at
+ the top for Finteractive_p. If so, skip it. */
+ fun = Findirect_function (*btp->function);
+ if (SUBRP (fun) && XSUBR (fun) == &Sinteractive_p)
+ btp = btp->next;
+
+ /* If we're running an Emacs 18-style byte-compiled function, there
+ may be a frame for Fbytecode at the top level. In any version of
+ Emacs there can be Fbytecode frames for subexpressions evaluated
+ inside catch and condition-case. Skip past them.
+
+ If this isn't a byte-compiled function, then we may now be
+ looking at several frames for special forms. Skip past them. */
+ while (btp
+ && (EQ (*btp->function, Qbytecode)
+ || btp->nargs == UNEVALLED))
+ btp = btp->next;
+
+ /* btp now points at the frame of the innermost function that isn't
+ a special form, ignoring frames for Finteractive_p and/or
+ Fbytecode at the top. If this frame is for a built-in function
+ (such as load or eval-region) return nil. */
+ fun = Findirect_function (*btp->function);
+ if (exclude_subrs_p && SUBRP (fun))
+ return 0;
+
+ /* btp points to the frame of a Lisp function that called interactive-p.
+ Return t if that function was called interactively. */
+ if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively))
+ return 1;
+ return 0;
+ }
+
+
+ DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0,
+ doc: /* Define NAME as a function.
+ The definition is (lambda ARGLIST [DOCSTRING] BODY...).
+ See also the function `interactive'.
+ usage: (defun NAME ARGLIST [DOCSTRING] BODY...) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object fn_name;
+ register Lisp_Object defn;
+
+ fn_name = Fcar (args);
+ CHECK_SYMBOL (fn_name);
+ defn = Fcons (Qlambda, Fcdr (args));
+ if (!NILP (Vpurify_flag))
+ defn = Fpurecopy (defn);
+ if (CONSP (XSYMBOL (fn_name)->function)
+ && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload))
+ LOADHIST_ATTACH (Fcons (Qt, fn_name));
+ Ffset (fn_name, defn);
+ LOADHIST_ATTACH (fn_name);
+ return fn_name;
+ }
+
+ DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0,
+ doc: /* Define NAME as a macro.
+ The actual definition looks like
+ (macro lambda ARGLIST [DOCSTRING] [DECL] BODY...).
+ When the macro is called, as in (NAME ARGS...),
+ the function (lambda ARGLIST BODY...) is applied to
+ the list ARGS... as it appears in the expression,
+ and the result should be a form to be evaluated instead of the original.
+
+ DECL is a declaration, optional, which can specify how to indent
+ calls to this macro and how Edebug should handle it. It looks like this:
+ (declare SPECS...)
+ The elements can look like this:
+ (indent INDENT)
+ Set NAME's `lisp-indent-function' property to INDENT.
+
+ (debug DEBUG)
+ Set NAME's `edebug-form-spec' property to DEBUG. (This is
+ equivalent to writing a `def-edebug-spec' for the macro.)
+ usage: (defmacro NAME ARGLIST [DOCSTRING] [DECL] BODY...) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object fn_name;
+ register Lisp_Object defn;
+ Lisp_Object lambda_list, doc, tail;
+
+ fn_name = Fcar (args);
+ CHECK_SYMBOL (fn_name);
+ lambda_list = Fcar (Fcdr (args));
+ tail = Fcdr (Fcdr (args));
+
+ doc = Qnil;
+ if (STRINGP (Fcar (tail)))
+ {
+ doc = XCAR (tail);
+ tail = XCDR (tail);
+ }
+
+ while (CONSP (Fcar (tail))
+ && EQ (Fcar (Fcar (tail)), Qdeclare))
+ {
+ if (!NILP (Vmacro_declaration_function))
+ {
+ struct gcpro gcpro1;
+ GCPRO1 (args);
+ call2 (Vmacro_declaration_function, fn_name, Fcar (tail));
+ UNGCPRO;
+ }
+
+ tail = Fcdr (tail);
+ }
+
+ if (NILP (doc))
+ tail = Fcons (lambda_list, tail);
+ else
+ tail = Fcons (lambda_list, Fcons (doc, tail));
+ defn = Fcons (Qmacro, Fcons (Qlambda, tail));
+
+ if (!NILP (Vpurify_flag))
+ defn = Fpurecopy (defn);
+ if (CONSP (XSYMBOL (fn_name)->function)
+ && EQ (XCAR (XSYMBOL (fn_name)->function), Qautoload))
+ LOADHIST_ATTACH (Fcons (Qt, fn_name));
+ Ffset (fn_name, defn);
+ LOADHIST_ATTACH (fn_name);
+ return fn_name;
+ }
+
+
+ DEFUN ("defvaralias", Fdefvaralias, Sdefvaralias, 2, 3, 0,
+ doc: /* Make SYMBOL a variable alias for symbol ALIASED.
+ Setting the value of SYMBOL will subsequently set the value of ALIASED,
+ and getting the value of SYMBOL will return the value ALIASED has.
+ Third arg DOCSTRING, if non-nil, is documentation for SYMBOL.
+ The return value is ALIASED. */)
+ (symbol, aliased, docstring)
+ Lisp_Object symbol, aliased, docstring;
+ {
+ struct Lisp_Symbol *sym;
+
+ CHECK_SYMBOL (symbol);
+ CHECK_SYMBOL (aliased);
+
+ if (SYMBOL_CONSTANT_P (symbol))
+ error ("Cannot make a constant an alias");
+
+ sym = XSYMBOL (symbol);
+ sym->indirect_variable = 1;
+ sym->value = aliased;
+ sym->constant = SYMBOL_CONSTANT_P (aliased);
+ LOADHIST_ATTACH (Fcons (Qdefvar, symbol));
+ if (!NILP (docstring))
+ Fput (symbol, Qvariable_documentation, docstring);
+
+ return aliased;
+ }
+
+
+ DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0,
+ doc: /* Define SYMBOL as a variable.
+ You are not required to define a variable in order to use it,
+ but the definition can supply documentation and an initial value
+ in a way that tags can recognize.
+
+ INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is
void.
+ If SYMBOL is buffer-local, its default value is what is set;
+ buffer-local values are not affected.
+ INITVALUE and DOCSTRING are optional.
+ If DOCSTRING starts with *, this variable is identified as a user option.
+ This means that M-x set-variable recognizes it.
+ See also `user-variable-p'.
+ If INITVALUE is missing, SYMBOL's value is not set.
+
+ If SYMBOL has a local binding, then this form affects the local
+ binding. This is usually not what you want. Thus, if you need to
+ load a file defining variables, with this form or with `defconst' or
+ `defcustom', you should always load that file _outside_ any bindings
+ for these variables. \(`defconst' and `defcustom' behave similarly in
+ this respect.)
+ usage: (defvar SYMBOL &optional INITVALUE DOCSTRING) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object sym, tem, tail;
+
+ sym = Fcar (args);
+ tail = Fcdr (args);
+ if (!NILP (Fcdr (Fcdr (tail))))
+ error ("too many arguments");
+
+ tem = Fdefault_boundp (sym);
+ if (!NILP (tail))
+ {
+ if (NILP (tem))
+ Fset_default (sym, Feval (Fcar (tail)));
+ tail = Fcdr (tail);
+ tem = Fcar (tail);
+ if (!NILP (tem))
+ {
+ if (!NILP (Vpurify_flag))
+ tem = Fpurecopy (tem);
+ Fput (sym, Qvariable_documentation, tem);
+ }
+ LOADHIST_ATTACH (Fcons (Qdefvar, sym));
+ }
+ else
+ /* Simple (defvar <var>) should not count as a definition at all.
+ It could get in the way of other definitions, and unloading this
+ package could try to make the variable unbound. */
+ ;
+
+ return sym;
+ }
+
+ DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0,
+ doc: /* Define SYMBOL as a constant variable.
+ The intent is that neither programs nor users should ever change this value.
+ Always sets the value of SYMBOL to the result of evalling INITVALUE.
+ If SYMBOL is buffer-local, its default value is what is set;
+ buffer-local values are not affected.
+ DOCSTRING is optional.
+
+ If SYMBOL has a local binding, then this form sets the local binding's
+ value. However, you should normally not make local bindings for
+ variables defined with this form.
+ usage: (defconst SYMBOL INITVALUE [DOCSTRING]) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object sym, tem;
+
+ sym = Fcar (args);
+ if (!NILP (Fcdr (Fcdr (Fcdr (args)))))
+ error ("too many arguments");
+
+ tem = Feval (Fcar (Fcdr (args)));
+ if (!NILP (Vpurify_flag))
+ tem = Fpurecopy (tem);
+ Fset_default (sym, tem);
+ tem = Fcar (Fcdr (Fcdr (args)));
+ if (!NILP (tem))
+ {
+ if (!NILP (Vpurify_flag))
+ tem = Fpurecopy (tem);
+ Fput (sym, Qvariable_documentation, tem);
+ }
+ LOADHIST_ATTACH (Fcons (Qdefvar, sym));
+ return sym;
+ }
+
+ DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0,
+ doc: /* Returns t if VARIABLE is intended to be set and modified by
users.
+ \(The alternative is a variable used internally in a Lisp program.)
+ Determined by whether the first character of the documentation
+ for the variable is `*' or if the variable is customizable (has a non-nil
+ value of `standard-value' or of `custom-autoload' on its property list). */)
+ (variable)
+ Lisp_Object variable;
+ {
+ Lisp_Object documentation;
+
+ if (!SYMBOLP (variable))
+ return Qnil;
+
+ documentation = Fget (variable, Qvariable_documentation);
+ if (INTEGERP (documentation) && XINT (documentation) < 0)
+ return Qt;
+ if (STRINGP (documentation)
+ && ((unsigned char) SREF (documentation, 0) == '*'))
+ return Qt;
+ /* If it is (STRING . INTEGER), a negative integer means a user variable.
*/
+ if (CONSP (documentation)
+ && STRINGP (XCAR (documentation))
+ && INTEGERP (XCDR (documentation))
+ && XINT (XCDR (documentation)) < 0)
+ return Qt;
+ /* Customizable? See `custom-variable-p'. */
+ if ((!NILP (Fget (variable, intern ("standard-value"))))
+ || (!NILP (Fget (variable, intern ("custom-autoload")))))
+ return Qt;
+ return Qnil;
+ }
+
+ DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0,
+ doc: /* Bind variables according to VARLIST then eval BODY.
+ The value of the last form in BODY is returned.
+ Each element of VARLIST is a symbol (which is bound to nil)
+ or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
+ Each VALUEFORM can refer to the symbols already bound by this VARLIST.
+ usage: (let* VARLIST BODY...) */)
+ (args)
+ Lisp_Object args;
+ {
+ Lisp_Object varlist, val, elt;
+ int count = SPECPDL_INDEX ();
+ struct gcpro gcpro1, gcpro2, gcpro3;
+
+ GCPRO3 (args, elt, varlist);
+
+ varlist = Fcar (args);
+ while (!NILP (varlist))
+ {
+ QUIT;
+ elt = Fcar (varlist);
+ if (SYMBOLP (elt))
+ specbind (elt, Qnil);
+ else if (! NILP (Fcdr (Fcdr (elt))))
+ Fsignal (Qerror,
+ Fcons (build_string ("`let' bindings can have only one
value-form"),
+ elt));
+ else
+ {
+ val = Feval (Fcar (Fcdr (elt)));
+ specbind (Fcar (elt), val);
+ }
+ varlist = Fcdr (varlist);
+ }
+ UNGCPRO;
+ val = Fprogn (Fcdr (args));
+ return unbind_to (count, val);
+ }
+
+ DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0,
+ doc: /* Bind variables according to VARLIST then eval BODY.
+ The value of the last form in BODY is returned.
+ Each element of VARLIST is a symbol (which is bound to nil)
+ or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).
+ All the VALUEFORMs are evalled before any symbols are bound.
+ usage: (let VARLIST BODY...) */)
+ (args)
+ Lisp_Object args;
+ {
+ Lisp_Object *temps, tem;
+ register Lisp_Object elt, varlist;
+ int count = SPECPDL_INDEX ();
+ register int argnum;
+ struct gcpro gcpro1, gcpro2;
+
+ varlist = Fcar (args);
+
+ /* Make space to hold the values to give the bound variables */
+ elt = Flength (varlist);
+ temps = (Lisp_Object *) alloca (XFASTINT (elt) * sizeof (Lisp_Object));
+
+ /* Compute the values and store them in `temps' */
+
+ GCPRO2 (args, *temps);
+ gcpro2.nvars = 0;
+
+ for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist))
+ {
+ QUIT;
+ elt = Fcar (varlist);
+ if (SYMBOLP (elt))
+ temps [argnum++] = Qnil;
+ else if (! NILP (Fcdr (Fcdr (elt))))
+ Fsignal (Qerror,
+ Fcons (build_string ("`let' bindings can have only one
value-form"),
+ elt));
+ else
+ temps [argnum++] = Feval (Fcar (Fcdr (elt)));
+ gcpro2.nvars = argnum;
+ }
+ UNGCPRO;
+
+ varlist = Fcar (args);
+ for (argnum = 0; !NILP (varlist); varlist = Fcdr (varlist))
+ {
+ elt = Fcar (varlist);
+ tem = temps[argnum++];
+ if (SYMBOLP (elt))
+ specbind (elt, tem);
+ else
+ specbind (Fcar (elt), tem);
+ }
+
+ elt = Fprogn (Fcdr (args));
+ return unbind_to (count, elt);
+ }
+
+ DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0,
+ doc: /* If TEST yields non-nil, eval BODY... and repeat.
+ The order of execution is thus TEST, BODY, TEST, BODY and so on
+ until TEST returns nil.
+ usage: (while TEST BODY...) */)
+ (args)
+ Lisp_Object args;
+ {
+ Lisp_Object test, body;
+ struct gcpro gcpro1, gcpro2;
+
+ GCPRO2 (test, body);
+
+ test = Fcar (args);
+ body = Fcdr (args);
+ while (!NILP (Feval (test)))
+ {
+ QUIT;
+ Fprogn (body);
+ }
+
+ UNGCPRO;
+ return Qnil;
+ }
+
+ DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0,
+ doc: /* Return result of expanding macros at top level of FORM.
+ If FORM is not a macro call, it is returned unchanged.
+ Otherwise, the macro is expanded and the expansion is considered
+ in place of FORM. When a non-macro-call results, it is returned.
+
+ The second optional arg ENVIRONMENT specifies an environment of macro
+ definitions to shadow the loaded ones for use in file byte-compilation. */)
+ (form, environment)
+ Lisp_Object form;
+ Lisp_Object environment;
+ {
+ /* With cleanups from Hallvard Furuseth. */
+ register Lisp_Object expander, sym, def, tem;
+
+ while (1)
+ {
+ /* Come back here each time we expand a macro call,
+ in case it expands into another macro call. */
+ if (!CONSP (form))
+ break;
+ /* Set SYM, give DEF and TEM right values in case SYM is not a symbol.
*/
+ def = sym = XCAR (form);
+ tem = Qnil;
+ /* Trace symbols aliases to other symbols
+ until we get a symbol that is not an alias. */
+ while (SYMBOLP (def))
+ {
+ QUIT;
+ sym = def;
+ tem = Fassq (sym, environment);
+ if (NILP (tem))
+ {
+ def = XSYMBOL (sym)->function;
+ if (!EQ (def, Qunbound))
+ continue;
+ }
+ break;
+ }
+ /* Right now TEM is the result from SYM in ENVIRONMENT,
+ and if TEM is nil then DEF is SYM's function definition. */
+ if (NILP (tem))
+ {
+ /* SYM is not mentioned in ENVIRONMENT.
+ Look at its function definition. */
+ if (EQ (def, Qunbound) || !CONSP (def))
+ /* Not defined or definition not suitable */
+ break;
+ if (EQ (XCAR (def), Qautoload))
+ {
+ /* Autoloading function: will it be a macro when loaded? */
+ tem = Fnth (make_number (4), def);
+ if (EQ (tem, Qt) || EQ (tem, Qmacro))
+ /* Yes, load it and try again. */
+ {
+ struct gcpro gcpro1;
+ GCPRO1 (form);
+ do_autoload (def, sym);
+ UNGCPRO;
+ continue;
+ }
+ else
+ break;
+ }
+ else if (!EQ (XCAR (def), Qmacro))
+ break;
+ else expander = XCDR (def);
+ }
+ else
+ {
+ expander = XCDR (tem);
+ if (NILP (expander))
+ break;
+ }
+ form = apply1 (expander, XCDR (form));
+ }
+ return form;
+ }
+
+ DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0,
+ doc: /* Eval BODY allowing nonlocal exits using `throw'.
+ TAG is evalled to get the tag to use; it must not be nil.
+
+ Then the BODY is executed.
+ Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.
+ If no throw happens, `catch' returns the value of the last BODY form.
+ If a throw happens, it specifies the value to return from `catch'.
+ usage: (catch TAG BODY...) */)
+ (args)
+ Lisp_Object args;
+ {
+ register Lisp_Object tag;
+ struct gcpro gcpro1;
+
+ GCPRO1 (args);
+ tag = Feval (Fcar (args));
+ UNGCPRO;
+ return internal_catch (tag, Fprogn, Fcdr (args));
+ }
+
+ /* Set up a catch, then call C function FUNC on argument ARG.
+ FUNC should return a Lisp_Object.
+ This is how catches are done from within C code. */
+
+ Lisp_Object
+ internal_catch (tag, func, arg)
+ Lisp_Object tag;
+ Lisp_Object (*func) ();
+ Lisp_Object arg;
+ {
+ /* This structure is made part of the chain `catchlist'. */
+ struct catchtag c;
+
+ /* Fill in the components of c, and put it on the list. */
+ c.next = catchlist;
+ c.tag = tag;
+ c.val = Qnil;
+ c.backlist = backtrace_list;
+ c.handlerlist = handlerlist;
+ c.lisp_eval_depth = lisp_eval_depth;
+ c.pdlcount = SPECPDL_INDEX ();
+ c.poll_suppress_count = poll_suppress_count;
+ c.interrupt_input_blocked = interrupt_input_blocked;
+ c.gcpro = gcprolist;
+ c.byte_stack = byte_stack_list;
+ catchlist = &c;
+
+ /* Call FUNC. */
+ if (! _setjmp (c.jmp))
+ c.val = (*func) (arg);
+
+ /* Throw works by a longjmp that comes right here. */
+ catchlist = c.next;
+ return c.val;
+ }
+
+ /* Unwind the specbind, catch, and handler stacks back to CATCH, and
+ jump to that CATCH, returning VALUE as the value of that catch.
+
+ This is the guts Fthrow and Fsignal; they differ only in the way
+ they choose the catch tag to throw to. A catch tag for a
+ condition-case form has a TAG of Qnil.
+
+ Before each catch is discarded, unbind all special bindings and
+ execute all unwind-protect clauses made above that catch. Unwind
+ the handler stack as we go, so that the proper handlers are in
+ effect for each unwind-protect clause we run. At the end, restore
+ some static info saved in CATCH, and longjmp to the location
+ specified in the
+
+ This is used for correct unwinding in Fthrow and Fsignal. */
+
+ static void
+ unwind_to_catch (catch, value)
+ struct catchtag *catch;
+ Lisp_Object value;
+ {
+ register int last_time;
+
+ /* Save the value in the tag. */
+ catch->val = value;
+
+ /* Restore the polling-suppression count. */
+ set_poll_suppress_count (catch->poll_suppress_count);
+ interrupt_input_blocked = catch->interrupt_input_blocked;
+
+ do
+ {
+ last_time = catchlist == catch;
+
+ /* Unwind the specpdl stack, and then restore the proper set of
+ handlers. */
+ unbind_to (catchlist->pdlcount, Qnil);
+ handlerlist = catchlist->handlerlist;
+ catchlist = catchlist->next;
+ }
+ while (! last_time);
+
+ byte_stack_list = catch->byte_stack;
+ gcprolist = catch->gcpro;
+ #ifdef DEBUG_GCPRO
+ if (gcprolist != 0)
+ gcpro_level = gcprolist->level + 1;
+ else
+ gcpro_level = 0;
+ #endif
+ backtrace_list = catch->backlist;
+ lisp_eval_depth = catch->lisp_eval_depth;
+
+ _longjmp (catch->jmp, 1);
+ }
+
+ DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0,
+ doc: /* Throw to the catch for TAG and return VALUE from it.
+ Both TAG and VALUE are evalled. */)
+ (tag, value)
+ register Lisp_Object tag, value;
+ {
+ register struct catchtag *c;
+
+ while (1)
+ {
+ if (!NILP (tag))
+ for (c = catchlist; c; c = c->next)
+ {
+ if (EQ (c->tag, tag))
+ unwind_to_catch (c, value);
+ }
+ tag = Fsignal (Qno_catch, Fcons (tag, Fcons (value, Qnil)));
+ }
+ }
+
+
+ DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0,
+ doc: /* Do BODYFORM, protecting with UNWINDFORMS.
+ If BODYFORM completes normally, its value is returned
+ after executing the UNWINDFORMS.
+ If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.
+ usage: (unwind-protect BODYFORM UNWINDFORMS...) */)
+ (args)
+ Lisp_Object args;
+ {
+ Lisp_Object val;
+ int count = SPECPDL_INDEX ();
+
+ record_unwind_protect (Fprogn, Fcdr (args));
+ val = Feval (Fcar (args));
+ return unbind_to (count, val);
+ }
+
+ /* Chain of condition handlers currently in effect.
+ The elements of this chain are contained in the stack frames
+ of Fcondition_case and internal_condition_case.
+ When an error is signaled (by calling Fsignal, below),
+ this chain is searched for an element that applies. */
+
+ struct handler *handlerlist;
+
+ DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0,
+ doc: /* Regain control when an error is signaled.
+ Executes BODYFORM and returns its value if no error happens.
+ Each element of HANDLERS looks like (CONDITION-NAME BODY...)
+ where the BODY is made of Lisp expressions.
+
+ A handler is applicable to an error
+ if CONDITION-NAME is one of the error's condition names.
+ If an error happens, the first applicable handler is run.
+
+ The car of a handler may be a list of condition names
+ instead of a single condition name.
+
+ When a handler handles an error,
+ control returns to the condition-case and the handler BODY... is executed
+ with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).
+ VAR may be nil; then you do not get access to the signal information.
+
+ The value of the last BODY form is returned from the condition-case.
+ See also the function `signal' for more info.
+ usage: (condition-case VAR BODYFORM &rest HANDLERS) */)
+ (args)
+ Lisp_Object args;
+ {
+ Lisp_Object val;
+ struct catchtag c;
+ struct handler h;
+ register Lisp_Object bodyform, handlers;
+ volatile Lisp_Object var;
+
+ var = Fcar (args);
+ bodyform = Fcar (Fcdr (args));
+ handlers = Fcdr (Fcdr (args));
+ CHECK_SYMBOL (var);
+
+ for (val = handlers; CONSP (val); val = XCDR (val))
+ {
+ Lisp_Object tem;
+ tem = XCAR (val);
+ if (! (NILP (tem)
+ || (CONSP (tem)
+ && (SYMBOLP (XCAR (tem))
+ || CONSP (XCAR (tem))))))
+ error ("Invalid condition handler", tem);
+ }
+
+ c.tag = Qnil;
+ c.val = Qnil;
+ c.backlist = backtrace_list;
+ c.handlerlist = handlerlist;
+ c.lisp_eval_depth = lisp_eval_depth;
+ c.pdlcount = SPECPDL_INDEX ();
+ c.poll_suppress_count = poll_suppress_count;
+ c.interrupt_input_blocked = interrupt_input_blocked;
+ c.gcpro = gcprolist;
+ c.byte_stack = byte_stack_list;
+ if (_setjmp (c.jmp))
+ {
+ if (!NILP (h.var))
+ specbind (h.var, c.val);
+ val = Fprogn (Fcdr (h.chosen_clause));
+
+ /* Note that this just undoes the binding of h.var; whoever
+ longjumped to us unwound the stack to c.pdlcount before
+ throwing. */
+ unbind_to (c.pdlcount, Qnil);
+ return val;
+ }
+ c.next = catchlist;
+ catchlist = &c;
+
+ h.var = var;
+ h.handler = handlers;
+ h.next = handlerlist;
+ h.tag = &c;
+ handlerlist = &h;
+
+ val = Feval (bodyform);
+ catchlist = c.next;
+ handlerlist = h.next;
+ return val;
+ }
+
+ /* Call the function BFUN with no arguments, catching errors within it
+ according to HANDLERS. If there is an error, call HFUN with
+ one argument which is the data that describes the error:
+ (SIGNALNAME . DATA)
+
+ HANDLERS can be a list of conditions to catch.
+ If HANDLERS is Qt, catch all errors.
+ If HANDLERS is Qerror, catch all errors
+ but allow the debugger to run if that is enabled. */
+
+ Lisp_Object
+ internal_condition_case (bfun, handlers, hfun)
+ Lisp_Object (*bfun) ();
+ Lisp_Object handlers;
+ Lisp_Object (*hfun) ();
+ {
+ Lisp_Object val;
+ struct catchtag c;
+ struct handler h;
+
+ #if 0 /* We now handle interrupt_input_blocked properly.
+ What we still do not handle is exiting a signal handler. */
+ abort ();
+ #endif
+
+ c.tag = Qnil;
+ c.val = Qnil;
+ c.backlist = backtrace_list;
+ c.handlerlist = handlerlist;
+ c.lisp_eval_depth = lisp_eval_depth;
+ c.pdlcount = SPECPDL_INDEX ();
+ c.poll_suppress_count = poll_suppress_count;
+ c.interrupt_input_blocked = interrupt_input_blocked;
+ c.gcpro = gcprolist;
+ c.byte_stack = byte_stack_list;
+ if (_setjmp (c.jmp))
+ {
+ return (*hfun) (c.val);
+ }
+ c.next = catchlist;
+ catchlist = &c;
+ h.handler = handlers;
+ h.var = Qnil;
+ h.next = handlerlist;
+ h.tag = &c;
+ handlerlist = &h;
+
+ val = (*bfun) ();
+ catchlist = c.next;
+ handlerlist = h.next;
+ return val;
+ }
+
+ /* Like internal_condition_case but call BFUN with ARG as its argument. */
+
+ Lisp_Object
+ internal_condition_case_1 (bfun, arg, handlers, hfun)
+ Lisp_Object (*bfun) ();
+ Lisp_Object arg;
+ Lisp_Object handlers;
+ Lisp_Object (*hfun) ();
+ {
+ Lisp_Object val;
+ struct catchtag c;
+ struct handler h;
+
+ c.tag = Qnil;
+ c.val = Qnil;
+ c.backlist = backtrace_list;
+ c.handlerlist = handlerlist;
+ c.lisp_eval_depth = lisp_eval_depth;
+ c.pdlcount = SPECPDL_INDEX ();
+ c.poll_suppress_count = poll_suppress_count;
+ c.interrupt_input_blocked = interrupt_input_blocked;
+ c.gcpro = gcprolist;
+ c.byte_stack = byte_stack_list;
+ if (_setjmp (c.jmp))
+ {
+ return (*hfun) (c.val);
+ }
+ c.next = catchlist;
+ catchlist = &c;
+ h.handler = handlers;
+ h.var = Qnil;
+ h.next = handlerlist;
+ h.tag = &c;
+ handlerlist = &h;
+
+ val = (*bfun) (arg);
+ catchlist = c.next;
+ handlerlist = h.next;
+ return val;
+ }
+
+
+ /* Like internal_condition_case but call BFUN with NARGS as first,
+ and ARGS as second argument. */
+
+ Lisp_Object
+ internal_condition_case_2 (bfun, nargs, args, handlers, hfun)
+ Lisp_Object (*bfun) ();
+ int nargs;
+ Lisp_Object *args;
+ Lisp_Object handlers;
+ Lisp_Object (*hfun) ();
+ {
+ Lisp_Object val;
+ struct catchtag c;
+ struct handler h;
+
+ c.tag = Qnil;
+ c.val = Qnil;
+ c.backlist = backtrace_list;
+ c.handlerlist = handlerlist;
+ c.lisp_eval_depth = lisp_eval_depth;
+ c.pdlcount = SPECPDL_INDEX ();
+ c.poll_suppress_count = poll_suppress_count;
+ c.interrupt_input_blocked = interrupt_input_blocked;
+ c.gcpro = gcprolist;
+ c.byte_stack = byte_stack_list;
+ if (_setjmp (c.jmp))
+ {
+ return (*hfun) (c.val);
+ }
+ c.next = catchlist;
+ catchlist = &c;
+ h.handler = handlers;
+ h.var = Qnil;
+ h.next = handlerlist;
+ h.tag = &c;
+ handlerlist = &h;
+
+ val = (*bfun) (nargs, args);
+ catchlist = c.next;
+ handlerlist = h.next;
+ return val;
+ }
+
+
+ static Lisp_Object find_handler_clause P_ ((Lisp_Object, Lisp_Object,
+ Lisp_Object, Lisp_Object,
+ Lisp_Object *));
+
+ DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0,
+ doc: /* Signal an error. Args are ERROR-SYMBOL and associated DATA.
+ This function does not return.
+
+ An error symbol is a symbol with an `error-conditions' property
+ that is a list of condition names.
+ A handler for any of those names will get to handle this signal.
+ The symbol `error' should normally be one of them.
+
+ DATA should be a list. Its elements are printed as part of the error message.
+ See Info anchor `(elisp)Definition of signal' for some details on how this
+ error message is constructed.
+ If the signal is handled, DATA is made available to the handler.
+ See also the function `condition-case'. */)
+ (error_symbol, data)
+ Lisp_Object error_symbol, data;
+ {
+ /* When memory is full, ERROR-SYMBOL is nil,
+ and DATA is (REAL-ERROR-SYMBOL . REAL-DATA).
+ That is a special case--don't do this in other situations. */
+ register struct handler *allhandlers = handlerlist;
+ Lisp_Object conditions;
+ extern int gc_in_progress;
+ extern int waiting_for_input;
+ Lisp_Object debugger_value;
+ Lisp_Object string;
+ Lisp_Object real_error_symbol;
+ struct backtrace *bp;
+
+ immediate_quit = handling_signal = 0;
+ abort_on_gc = 0;
+ if (gc_in_progress || waiting_for_input)
+ abort ();
+
+ if (NILP (error_symbol))
+ real_error_symbol = Fcar (data);
+ else
+ real_error_symbol = error_symbol;
+
+ #if 0 /* rms: I don't know why this was here,
+ but it is surely wrong for an error that is handled. */
+ #ifdef HAVE_X_WINDOWS
+ if (display_hourglass_p)
+ cancel_hourglass ();
+ #endif
+ #endif
+
+ /* This hook is used by edebug. */
+ if (! NILP (Vsignal_hook_function)
+ && ! NILP (error_symbol))
+ call2 (Vsignal_hook_function, error_symbol, data);
+
+ conditions = Fget (real_error_symbol, Qerror_conditions);
+
+ /* Remember from where signal was called. Skip over the frame for
+ `signal' itself. If a frame for `error' follows, skip that,
+ too. Don't do this when ERROR_SYMBOL is nil, because that
+ is a memory-full error. */
+ Vsignaling_function = Qnil;
+ if (backtrace_list && !NILP (error_symbol))
+ {
+ bp = backtrace_list->next;
+ if (bp && bp->function && EQ (*bp->function, Qerror))
+ bp = bp->next;
+ if (bp && bp->function)
+ Vsignaling_function = *bp->function;
+ }
+
+ for (; handlerlist; handlerlist = handlerlist->next)
+ {
+ register Lisp_Object clause;
+
+ if (lisp_eval_depth + 20 > max_lisp_eval_depth)
+ max_lisp_eval_depth = lisp_eval_depth + 20;
+
+ if (specpdl_size + 40 > max_specpdl_size)
+ max_specpdl_size = specpdl_size + 40;
+
+ clause = find_handler_clause (handlerlist->handler, conditions,
+ error_symbol, data, &debugger_value);
+
+ if (EQ (clause, Qlambda))
+ {
+ /* We can't return values to code which signaled an error, but we
+ can continue code which has signaled a quit. */
+ if (EQ (real_error_symbol, Qquit))
+ return Qnil;
+ else
+ error ("Cannot return from the debugger in an error");
+ }
+
+ if (!NILP (clause))
+ {
+ Lisp_Object unwind_data;
+ struct handler *h = handlerlist;
+
+ handlerlist = allhandlers;
+
+ if (NILP (error_symbol))
+ unwind_data = data;
+ else
+ unwind_data = Fcons (error_symbol, data);
+ h->chosen_clause = clause;
+ unwind_to_catch (h->tag, unwind_data);
+ }
+ }
+
+ handlerlist = allhandlers;
+ /* If no handler is present now, try to run the debugger,
+ and if that fails, throw to top level. */
+ find_handler_clause (Qerror, conditions, error_symbol, data,
&debugger_value);
+ if (catchlist != 0)
+ Fthrow (Qtop_level, Qt);
+
+ if (! NILP (error_symbol))
+ data = Fcons (error_symbol, data);
+
+ string = Ferror_message_string (data);
+ fatal ("%s", SDATA (string), 0);
+ }
+
+ /* Return nonzero iff LIST is a non-nil atom or
+ a list containing one of CONDITIONS. */
+
+ static int
+ wants_debugger (list, conditions)
+ Lisp_Object list, conditions;
+ {
+ if (NILP (list))
+ return 0;
+ if (! CONSP (list))
+ return 1;
+
+ while (CONSP (conditions))
+ {
+ Lisp_Object this, tail;
+ this = XCAR (conditions);
+ for (tail = list; CONSP (tail); tail = XCDR (tail))
+ if (EQ (XCAR (tail), this))
+ return 1;
+ conditions = XCDR (conditions);
+ }
+ return 0;
+ }
+
+ /* Return 1 if an error with condition-symbols CONDITIONS,
+ and described by SIGNAL-DATA, should skip the debugger
+ according to debugger-ignored-errors. */
+
+ static int
+ skip_debugger (conditions, data)
+ Lisp_Object conditions, data;
+ {
+ Lisp_Object tail;
+ int first_string = 1;
+ Lisp_Object error_message;
+
+ error_message = Qnil;
+ for (tail = Vdebug_ignored_errors; CONSP (tail); tail = XCDR (tail))
+ {
+ if (STRINGP (XCAR (tail)))
+ {
+ if (first_string)
+ {
+ error_message = Ferror_message_string (data);
+ first_string = 0;
+ }
+
+ if (fast_string_match (XCAR (tail), error_message) >= 0)
+ return 1;
+ }
+ else
+ {
+ Lisp_Object contail;
+
+ for (contail = conditions; CONSP (contail); contail = XCDR (contail))
+ if (EQ (XCAR (tail), XCAR (contail)))
+ return 1;
+ }
+ }
+
+ return 0;
+ }
+
+ /* Value of Qlambda means we have called debugger and user has continued.
+ There are two ways to pass SIG and DATA:
+ = SIG is the error symbol, and DATA is the rest of the data.
+ = SIG is nil, and DATA is (SYMBOL . REST-OF-DATA).
+ This is for memory-full errors only.
+
+ Store value returned from debugger into *DEBUGGER_VALUE_PTR. */
+
+ static Lisp_Object
+ find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr)
+ Lisp_Object handlers, conditions, sig, data;
+ Lisp_Object *debugger_value_ptr;
+ {
+ register Lisp_Object h;
+ register Lisp_Object tem;
+
+ if (EQ (handlers, Qt)) /* t is used by handlers for all conditions, set up
by C code. */
+ return Qt;
+ /* error is used similarly, but means print an error message
+ and run the debugger if that is enabled. */
+ if (EQ (handlers, Qerror)
+ || !NILP (Vdebug_on_signal)) /* This says call debugger even if
+ there is a handler. */
+ {
+ int count = SPECPDL_INDEX ();
+ int debugger_called = 0;
+ Lisp_Object sig_symbol, combined_data;
+ /* This is set to 1 if we are handling a memory-full error,
+ because these must not run the debugger.
+ (There is no room in memory to do that!) */
+ int no_debugger = 0;
+
+ if (NILP (sig))
+ {
+ combined_data = data;
+ sig_symbol = Fcar (data);
+ no_debugger = 1;
+ }
+ else
+ {
+ combined_data = Fcons (sig, data);
+ sig_symbol = sig;
+ }
+
+ if (wants_debugger (Vstack_trace_on_error, conditions))
+ {
+ #ifdef PROTOTYPES
+ internal_with_output_to_temp_buffer ("*Backtrace*",
+ (Lisp_Object (*) (Lisp_Object))
Fbacktrace,
+ Qnil);
+ #else
+ internal_with_output_to_temp_buffer ("*Backtrace*",
+ Fbacktrace, Qnil);
+ #endif
+ }
+ if (! no_debugger
+ && (EQ (sig_symbol, Qquit)
+ ? debug_on_quit
+ : wants_debugger (Vdebug_on_error, conditions))
+ && ! skip_debugger (conditions, combined_data)
+ && when_entered_debugger < num_nonmacro_input_events)
+ {
+ specbind (Qdebug_on_error, Qnil);
+ *debugger_value_ptr
+ = call_debugger (Fcons (Qerror,
+ Fcons (combined_data, Qnil)));
+ debugger_called = 1;
+ }
+ /* If there is no handler, return saying whether we ran the debugger.
*/
+ if (EQ (handlers, Qerror))
+ {
+ if (debugger_called)
+ return unbind_to (count, Qlambda);
+ return Qt;
+ }
+ }
+ for (h = handlers; CONSP (h); h = Fcdr (h))
+ {
+ Lisp_Object handler, condit;
+
+ handler = Fcar (h);
+ if (!CONSP (handler))
+ continue;
+ condit = Fcar (handler);
+ /* Handle a single condition name in handler HANDLER. */
+ if (SYMBOLP (condit))
+ {
+ tem = Fmemq (Fcar (handler), conditions);
+ if (!NILP (tem))
+ return handler;
+ }
+ /* Handle a list of condition names in handler HANDLER. */
+ else if (CONSP (condit))
+ {
+ while (CONSP (condit))
+ {
+ tem = Fmemq (Fcar (condit), conditions);
+ if (!NILP (tem))
+ return handler;
+ condit = XCDR (condit);
+ }
+ }
+ }
+ return Qnil;
+ }
+
+ /* dump an error message; called like printf */
+
+ /* VARARGS 1 */
+ void
+ error (m, a1, a2, a3)
+ char *m;
+ char *a1, *a2, *a3;
+ {
+ char buf[200];
+ int size = 200;
+ int mlen;
+ char *buffer = buf;
+ char *args[3];
+ int allocated = 0;
+ Lisp_Object string;
+
+ args[0] = a1;
+ args[1] = a2;
+ args[2] = a3;
+
+ mlen = strlen (m);
+
+ while (1)
+ {
+ int used = doprnt (buffer, size, m, m + mlen, 3, args);
+ if (used < size)
+ break;
+ size *= 2;
+ if (allocated)
+ buffer = (char *) xrealloc (buffer, size);
+ else
+ {
+ buffer = (char *) xmalloc (size);
+ allocated = 1;
+ }
+ }
+
+ string = build_string (buffer);
+ if (allocated)
+ xfree (buffer);
+
+ Fsignal (Qerror, Fcons (string, Qnil));
+ abort ();
+ }
+
+ DEFUN ("commandp", Fcommandp, Scommandp, 1, 2, 0,
+ doc: /* Non-nil if FUNCTION makes provisions for interactive calling.
+ This means it contains a description for how to read arguments to give it.
+ The value is nil for an invalid function or a symbol with no function
+ definition.
+
+ Interactively callable functions include strings and vectors (treated
+ as keyboard macros), lambda-expressions that contain a top-level call
+ to `interactive', autoload definitions made by `autoload' with non-nil
+ fourth argument, and some of the built-in functions of Lisp.
+
+ Also, a symbol satisfies `commandp' if its function definition does so.
+
+ If the optional argument FOR-CALL-INTERACTIVELY is non-nil,
+ then strings and vectors are not accepted. */)
+ (function, for_call_interactively)
+ Lisp_Object function, for_call_interactively;
+ {
+ register Lisp_Object fun;
+ register Lisp_Object funcar;
+
+ fun = function;
+
+ fun = indirect_function (fun);
+ if (EQ (fun, Qunbound))
+ return Qnil;
+
+ /* Emacs primitives are interactive if their DEFUN specifies an
+ interactive spec. */
+ if (SUBRP (fun))
+ {
+ if (XSUBR (fun)->prompt)
+ return Qt;
+ else
+ return Qnil;
+ }
+
+ /* Bytecode objects are interactive if they are long enough to
+ have an element whose index is COMPILED_INTERACTIVE, which is
+ where the interactive spec is stored. */
+ else if (COMPILEDP (fun))
+ return ((ASIZE (fun) & PSEUDOVECTOR_SIZE_MASK) > COMPILED_INTERACTIVE
+ ? Qt : Qnil);
+
+ /* Strings and vectors are keyboard macros. */
+ if (NILP (for_call_interactively) && (STRINGP (fun) || VECTORP (fun)))
+ return Qt;
+
+ /* Lists may represent commands. */
+ if (!CONSP (fun))
+ return Qnil;
+ funcar = XCAR (fun);
+ if (EQ (funcar, Qlambda))
+ return Fassq (Qinteractive, Fcdr (XCDR (fun)));
+ if (EQ (funcar, Qautoload))
+ return Fcar (Fcdr (Fcdr (XCDR (fun))));
+ else
+ return Qnil;
+ }
+
+ /* ARGSUSED */
+ DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0,
+ doc: /* Define FUNCTION to autoload from FILE.
+ FUNCTION is a symbol; FILE is a file name string to pass to `load'.
+ Third arg DOCSTRING is documentation for the function.
+ Fourth arg INTERACTIVE if non-nil says function can be called interactively.
+ Fifth arg TYPE indicates the type of the object:
+ nil or omitted says FUNCTION is a function,
+ `keymap' says FUNCTION is really a keymap, and
+ `macro' or t says FUNCTION is really a macro.
+ Third through fifth args give info about the real definition.
+ They default to nil.
+ If FUNCTION is already defined other than as an autoload,
+ this does nothing and returns nil. */)
+ (function, file, docstring, interactive, type)
+ Lisp_Object function, file, docstring, interactive, type;
+ {
+ #ifdef NO_ARG_ARRAY
+ Lisp_Object args[4];
+ #endif
+
+ CHECK_SYMBOL (function);
+ CHECK_STRING (file);
+
+ /* If function is defined and not as an autoload, don't override */
+ if (!EQ (XSYMBOL (function)->function, Qunbound)
+ && !(CONSP (XSYMBOL (function)->function)
+ && EQ (XCAR (XSYMBOL (function)->function), Qautoload)))
+ return Qnil;
+
+ if (NILP (Vpurify_flag))
+ /* Only add entries after dumping, because the ones before are
+ not useful and else we get loads of them from the loaddefs.el. */
+ LOADHIST_ATTACH (Fcons (Qautoload, function));
+
+ #ifdef NO_ARG_ARRAY
+ args[0] = file;
+ args[1] = docstring;
+ args[2] = interactive;
+ args[3] = type;
+
+ return Ffset (function, Fcons (Qautoload, Flist (4, &args[0])));
+ #else /* NO_ARG_ARRAY */
+ return Ffset (function, Fcons (Qautoload, Flist (4, &file)));
+ #endif /* not NO_ARG_ARRAY */
+ }
+
+ Lisp_Object
+ un_autoload (oldqueue)
+ Lisp_Object oldqueue;
+ {
+ register Lisp_Object queue, first, second;
+
+ /* Queue to unwind is current value of Vautoload_queue.
+ oldqueue is the shadowed value to leave in Vautoload_queue. */
+ queue = Vautoload_queue;
+ Vautoload_queue = oldqueue;
+ while (CONSP (queue))
+ {
+ first = XCAR (queue);
+ second = Fcdr (first);
+ first = Fcar (first);
+ if (EQ (second, Qnil))
+ Vfeatures = first;
+ else
+ Ffset (first, second);
+ queue = XCDR (queue);
+ }
+ return Qnil;
+ }
+
+ /* Load an autoloaded function.
+ FUNNAME is the symbol which is the function's name.
+ FUNDEF is the autoload definition (a list). */
+
+ void
+ do_autoload (fundef, funname)
+ Lisp_Object fundef, funname;
+ {
+ int count = SPECPDL_INDEX ();
+ Lisp_Object fun, queue, first, second;
+ struct gcpro gcpro1, gcpro2, gcpro3;
+
+ /* This is to make sure that loadup.el gives a clear picture
+ of what files are preloaded and when. */
+ if (! NILP (Vpurify_flag))
+ error ("Attempt to autoload %s while preparing to dump",
+ SDATA (SYMBOL_NAME (funname)));
+
+ fun = funname;
+ CHECK_SYMBOL (funname);
+ GCPRO3 (fun, funname, fundef);
+
+ /* Preserve the match data. */
+ record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil));
+
+ /* Value saved here is to be restored into Vautoload_queue. */
+ record_unwind_protect (un_autoload, Vautoload_queue);
+ Vautoload_queue = Qt;
+ Fload (Fcar (Fcdr (fundef)), Qnil, noninteractive ? Qt : Qnil, Qnil, Qt);
+
+ /* Save the old autoloads, in case we ever do an unload. */
+ queue = Vautoload_queue;
+ while (CONSP (queue))
+ {
+ first = XCAR (queue);
+ second = Fcdr (first);
+ first = Fcar (first);
+
+ /* Note: This test is subtle. The cdr of an autoload-queue entry
+ may be an atom if the autoload entry was generated by a defalias
+ or fset. */
+ if (CONSP (second))
+ Fput (first, Qautoload, (XCDR (second)));
+
+ queue = XCDR (queue);
+ }
+
+ /* Once loading finishes, don't undo it. */
+ Vautoload_queue = Qt;
+ unbind_to (count, Qnil);
+
+ fun = Findirect_function (fun);
+
+ if (!NILP (Fequal (fun, fundef)))
+ error ("Autoloading failed to define function %s",
+ SDATA (SYMBOL_NAME (funname)));
+ UNGCPRO;
+ }
+
+
+ DEFUN ("eval", Feval, Seval, 1, 1, 0,
+ doc: /* Evaluate FORM and return its value. */)
+ (form)
+ Lisp_Object form;
+ {
+ Lisp_Object fun, val, original_fun, original_args;
+ Lisp_Object funcar;
+ struct backtrace backtrace;
+ struct gcpro gcpro1, gcpro2, gcpro3;
+
+ if (handling_signal)
+ abort ();
+
+ if (SYMBOLP (form))
+ return Fsymbol_value (form);
+ if (!CONSP (form))
+ return form;
+
+ QUIT;
+ if (consing_since_gc > gc_cons_threshold)
+ {
+ GCPRO1 (form);
+ Fgarbage_collect ();
+ UNGCPRO;
+ }
+
+ if (++lisp_eval_depth > max_lisp_eval_depth)
+ {
+ if (max_lisp_eval_depth < 100)
+ max_lisp_eval_depth = 100;
+ if (lisp_eval_depth > max_lisp_eval_depth)
+ error ("Lisp nesting exceeds max-lisp-eval-depth");
+ }
+
+ original_fun = Fcar (form);
+ original_args = Fcdr (form);
+
+ backtrace.next = backtrace_list;
+ backtrace_list = &backtrace;
+ backtrace.function = &original_fun; /* This also protects them from gc */
+ backtrace.args = &original_args;
+ backtrace.nargs = UNEVALLED;
+ backtrace.evalargs = 1;
+ backtrace.debug_on_exit = 0;
+
+ if (debug_on_next_call)
+ do_debug_on_call (Qt);
+
+ /* At this point, only original_fun and original_args
+ have values that will be used below */
+ retry:
+ fun = Findirect_function (original_fun);
+
+ if (SUBRP (fun))
+ {
+ Lisp_Object numargs;
+ Lisp_Object argvals[8];
+ Lisp_Object args_left;
+ register int i, maxargs;
+
+ args_left = original_args;
+ numargs = Flength (args_left);
+
+ if (XINT (numargs) < XSUBR (fun)->min_args ||
+ (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < XINT
(numargs)))
+ return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs,
Qnil)));
+
+ if (XSUBR (fun)->max_args == UNEVALLED)
+ {
+ backtrace.evalargs = 0;
+ val = (*XSUBR (fun)->function) (args_left);
+ goto done;
+ }
+
+ if (XSUBR (fun)->max_args == MANY)
+ {
+ /* Pass a vector of evaluated arguments */
+ Lisp_Object *vals;
+ register int argnum = 0;
+
+ vals = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object));
+
+ GCPRO3 (args_left, fun, fun);
+ gcpro3.var = vals;
+ gcpro3.nvars = 0;
+
+ while (!NILP (args_left))
+ {
+ vals[argnum++] = Feval (Fcar (args_left));
+ args_left = Fcdr (args_left);
+ gcpro3.nvars = argnum;
+ }
+
+ backtrace.args = vals;
+ backtrace.nargs = XINT (numargs);
+
+ val = (*XSUBR (fun)->function) (XINT (numargs), vals);
+ UNGCPRO;
+ goto done;
+ }
+
+ GCPRO3 (args_left, fun, fun);
+ gcpro3.var = argvals;
+ gcpro3.nvars = 0;
+
+ maxargs = XSUBR (fun)->max_args;
+ for (i = 0; i < maxargs; args_left = Fcdr (args_left))
+ {
+ argvals[i] = Feval (Fcar (args_left));
+ gcpro3.nvars = ++i;
+ }
+
+ UNGCPRO;
+
+ backtrace.args = argvals;
+ backtrace.nargs = XINT (numargs);
+
+ switch (i)
+ {
+ case 0:
+ val = (*XSUBR (fun)->function) ();
+ goto done;
+ case 1:
+ val = (*XSUBR (fun)->function) (argvals[0]);
+ goto done;
+ case 2:
+ val = (*XSUBR (fun)->function) (argvals[0], argvals[1]);
+ goto done;
+ case 3:
+ val = (*XSUBR (fun)->function) (argvals[0], argvals[1],
+ argvals[2]);
+ goto done;
+ case 4:
+ val = (*XSUBR (fun)->function) (argvals[0], argvals[1],
+ argvals[2], argvals[3]);
+ goto done;
+ case 5:
+ val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2],
+ argvals[3], argvals[4]);
+ goto done;
+ case 6:
+ val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2],
+ argvals[3], argvals[4], argvals[5]);
+ goto done;
+ case 7:
+ val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2],
+ argvals[3], argvals[4], argvals[5],
+ argvals[6]);
+ goto done;
+
+ case 8:
+ val = (*XSUBR (fun)->function) (argvals[0], argvals[1], argvals[2],
+ argvals[3], argvals[4], argvals[5],
+ argvals[6], argvals[7]);
+ goto done;
+
+ default:
+ /* Someone has created a subr that takes more arguments than
+ is supported by this code. We need to either rewrite the
+ subr to use a different argument protocol, or add more
+ cases to this switch. */
+ abort ();
+ }
+ }
+ if (COMPILEDP (fun))
+ val = apply_lambda (fun, original_args, 1);
+ else
+ {
+ if (!CONSP (fun))
+ return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+ funcar = Fcar (fun);
+ if (!SYMBOLP (funcar))
+ return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+ if (EQ (funcar, Qautoload))
+ {
+ do_autoload (fun, original_fun);
+ goto retry;
+ }
+ if (EQ (funcar, Qmacro))
+ val = Feval (apply1 (Fcdr (fun), original_args));
+ else if (EQ (funcar, Qlambda))
+ val = apply_lambda (fun, original_args, 1);
+ else
+ return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+ }
+ done:
+ lisp_eval_depth--;
+ if (backtrace.debug_on_exit)
+ val = call_debugger (Fcons (Qexit, Fcons (val, Qnil)));
+ backtrace_list = backtrace.next;
+
+ return val;
+ }
+
+ DEFUN ("apply", Fapply, Sapply, 2, MANY, 0,
+ doc: /* Call FUNCTION with our remaining args, using our last arg as
list of args.
+ Then return the value FUNCTION returns.
+ Thus, (apply '+ 1 2 '(3 4)) returns 10.
+ usage: (apply FUNCTION &rest ARGUMENTS) */)
+ (nargs, args)
+ int nargs;
+ Lisp_Object *args;
+ {
+ register int i, numargs;
+ register Lisp_Object spread_arg;
+ register Lisp_Object *funcall_args;
+ Lisp_Object fun;
+ struct gcpro gcpro1;
+
+ fun = args [0];
+ funcall_args = 0;
+ spread_arg = args [nargs - 1];
+ CHECK_LIST (spread_arg);
+
+ numargs = XINT (Flength (spread_arg));
+
+ if (numargs == 0)
+ return Ffuncall (nargs - 1, args);
+ else if (numargs == 1)
+ {
+ args [nargs - 1] = XCAR (spread_arg);
+ return Ffuncall (nargs, args);
+ }
+
+ numargs += nargs - 2;
+
+ fun = indirect_function (fun);
+ if (EQ (fun, Qunbound))
+ {
+ /* Let funcall get the error */
+ fun = args[0];
+ goto funcall;
+ }
+
+ if (SUBRP (fun))
+ {
+ if (numargs < XSUBR (fun)->min_args
+ || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs))
+ goto funcall; /* Let funcall get the error */
+ else if (XSUBR (fun)->max_args > numargs)
+ {
+ /* Avoid making funcall cons up a yet another new vector of arguments
+ by explicitly supplying nil's for optional values */
+ funcall_args = (Lisp_Object *) alloca ((1 + XSUBR (fun)->max_args)
+ * sizeof (Lisp_Object));
+ for (i = numargs; i < XSUBR (fun)->max_args;)
+ funcall_args[++i] = Qnil;
+ GCPRO1 (*funcall_args);
+ gcpro1.nvars = 1 + XSUBR (fun)->max_args;
+ }
+ }
+ funcall:
+ /* We add 1 to numargs because funcall_args includes the
+ function itself as well as its arguments. */
+ if (!funcall_args)
+ {
+ funcall_args = (Lisp_Object *) alloca ((1 + numargs)
+ * sizeof (Lisp_Object));
+ GCPRO1 (*funcall_args);
+ gcpro1.nvars = 1 + numargs;
+ }
+
+ bcopy (args, funcall_args, nargs * sizeof (Lisp_Object));
+ /* Spread the last arg we got. Its first element goes in
+ the slot that it used to occupy, hence this value of I. */
+ i = nargs - 1;
+ while (!NILP (spread_arg))
+ {
+ funcall_args [i++] = XCAR (spread_arg);
+ spread_arg = XCDR (spread_arg);
+ }
+
+ /* By convention, the caller needs to gcpro Ffuncall's args. */
+ RETURN_UNGCPRO (Ffuncall (gcpro1.nvars, funcall_args));
+ }
+
+ /* Run hook variables in various ways. */
+
+ enum run_hooks_condition {to_completion, until_success, until_failure};
+ static Lisp_Object run_hook_with_args P_ ((int, Lisp_Object *,
+ enum run_hooks_condition));
+
+ DEFUN ("run-hooks", Frun_hooks, Srun_hooks, 0, MANY, 0,
+ doc: /* Run each hook in HOOKS. Major mode functions use this.
+ Each argument should be a symbol, a hook variable.
+ These symbols are processed in the order specified.
+ If a hook symbol has a non-nil value, that value may be a function
+ or a list of functions to be called to run the hook.
+ If the value is a function, it is called with no arguments.
+ If it is a list, the elements are called, in order, with no arguments.
+
+ Do not use `make-local-variable' to make a hook variable buffer-local.
+ Instead, use `add-hook' and specify t for the LOCAL argument.
+ usage: (run-hooks &rest HOOKS) */)
+ (nargs, args)
+ int nargs;
+ Lisp_Object *args;
+ {
+ Lisp_Object hook[1];
+ register int i;
+
+ for (i = 0; i < nargs; i++)
+ {
+ hook[0] = args[i];
+ run_hook_with_args (1, hook, to_completion);
+ }
+
+ return Qnil;
+ }
+
+ DEFUN ("run-hook-with-args", Frun_hook_with_args,
+ Srun_hook_with_args, 1, MANY, 0,
+ doc: /* Run HOOK with the specified arguments ARGS.
+ HOOK should be a symbol, a hook variable. If HOOK has a non-nil
+ value, that value may be a function or a list of functions to be
+ called to run the hook. If the value is a function, it is called with
+ the given arguments and its return value is returned. If it is a list
+ of functions, those functions are called, in order,
+ with the given arguments ARGS.
+ It is best not to depend on the value return by `run-hook-with-args',
+ as that may change.
+
+ Do not use `make-local-variable' to make a hook variable buffer-local.
+ Instead, use `add-hook' and specify t for the LOCAL argument.
+ usage: (run-hook-with-args HOOK &rest ARGS) */)
+ (nargs, args)
+ int nargs;
+ Lisp_Object *args;
+ {
+ return run_hook_with_args (nargs, args, to_completion);
+ }
+
+ DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success,
+ Srun_hook_with_args_until_success, 1, MANY, 0,
+ doc: /* Run HOOK with the specified arguments ARGS.
+ HOOK should be a symbol, a hook variable. Its value should
+ be a list of functions. We call those functions, one by one,
+ passing arguments ARGS to each of them, until one of them
+ returns a non-nil value. Then we return that value.
+ If all the functions return nil, we return nil.
+
+ Do not use `make-local-variable' to make a hook variable buffer-local.
+ Instead, use `add-hook' and specify t for the LOCAL argument.
+ usage: (run-hook-with-args-until-success HOOK &rest ARGS) */)
+ (nargs, args)
+ int nargs;
+ Lisp_Object *args;
+ {
+ return run_hook_with_args (nargs, args, until_success);
+ }
+
+ DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure,
+ Srun_hook_with_args_until_failure, 1, MANY, 0,
+ doc: /* Run HOOK with the specified arguments ARGS.
+ HOOK should be a symbol, a hook variable. Its value should
+ be a list of functions. We call those functions, one by one,
+ passing arguments ARGS to each of them, until one of them
+ returns nil. Then we return nil.
+ If all the functions return non-nil, we return non-nil.
+
+ Do not use `make-local-variable' to make a hook variable buffer-local.
+ Instead, use `add-hook' and specify t for the LOCAL argument.
+ usage: (run-hook-with-args-until-failure HOOK &rest ARGS) */)
+ (nargs, args)
+ int nargs;
+ Lisp_Object *args;
+ {
+ return run_hook_with_args (nargs, args, until_failure);
+ }
+
+ /* ARGS[0] should be a hook symbol.
+ Call each of the functions in the hook value, passing each of them
+ as arguments all the rest of ARGS (all NARGS - 1 elements).
+ COND specifies a condition to test after each call
+ to decide whether to stop.
+ The caller (or its caller, etc) must gcpro all of ARGS,
+ except that it isn't necessary to gcpro ARGS[0]. */
+
+ static Lisp_Object
+ run_hook_with_args (nargs, args, cond)
+ int nargs;
+ Lisp_Object *args;
+ enum run_hooks_condition cond;
+ {
+ Lisp_Object sym, val, ret;
+ Lisp_Object globals;
+ struct gcpro gcpro1, gcpro2, gcpro3;
+
+ /* If we are dying or still initializing,
+ don't do anything--it would probably crash if we tried. */
+ if (NILP (Vrun_hooks))
+ return Qnil;
+
+ sym = args[0];
+ val = find_symbol_value (sym);
+ ret = (cond == until_failure ? Qt : Qnil);
+
+ if (EQ (val, Qunbound) || NILP (val))
+ return ret;
+ else if (!CONSP (val) || EQ (XCAR (val), Qlambda))
+ {
+ args[0] = val;
+ return Ffuncall (nargs, args);
+ }
+ else
+ {
+ globals = Qnil;
+ GCPRO3 (sym, val, globals);
+
+ for (;
+ CONSP (val) && ((cond == to_completion)
+ || (cond == until_success ? NILP (ret)
+ : !NILP (ret)));
+ val = XCDR (val))
+ {
+ if (EQ (XCAR (val), Qt))
+ {
+ /* t indicates this hook has a local binding;
+ it means to run the global binding too. */
+
+ for (globals = Fdefault_value (sym);
+ CONSP (globals) && ((cond == to_completion)
+ || (cond == until_success ? NILP (ret)
+ : !NILP (ret)));
+ globals = XCDR (globals))
+ {
+ args[0] = XCAR (globals);
+ /* In a global value, t should not occur. If it does, we
+ must ignore it to avoid an endless loop. */
+ if (!EQ (args[0], Qt))
+ ret = Ffuncall (nargs, args);
+ }
+ }
+ else
+ {
+ args[0] = XCAR (val);
+ ret = Ffuncall (nargs, args);
+ }
+ }
+
+ UNGCPRO;
+ return ret;
+ }
+ }
+
+ /* Run a hook symbol ARGS[0], but use FUNLIST instead of the actual
+ present value of that symbol.
+ Call each element of FUNLIST,
+ passing each of them the rest of ARGS.
+ The caller (or its caller, etc) must gcpro all of ARGS,
+ except that it isn't necessary to gcpro ARGS[0]. */
+
+ Lisp_Object
+ run_hook_list_with_args (funlist, nargs, args)
+ Lisp_Object funlist;
+ int nargs;
+ Lisp_Object *args;
+ {
+ Lisp_Object sym;
+ Lisp_Object val;
+ Lisp_Object globals;
+ struct gcpro gcpro1, gcpro2, gcpro3;
+
+ sym = args[0];
+ globals = Qnil;
+ GCPRO3 (sym, val, globals);
+
+ for (val = funlist; CONSP (val); val = XCDR (val))
+ {
+ if (EQ (XCAR (val), Qt))
+ {
+ /* t indicates this hook has a local binding;
+ it means to run the global binding too. */
+
+ for (globals = Fdefault_value (sym);
+ CONSP (globals);
+ globals = XCDR (globals))
+ {
+ args[0] = XCAR (globals);
+ /* In a global value, t should not occur. If it does, we
+ must ignore it to avoid an endless loop. */
+ if (!EQ (args[0], Qt))
+ Ffuncall (nargs, args);
+ }
+ }
+ else
+ {
+ args[0] = XCAR (val);
+ Ffuncall (nargs, args);
+ }
+ }
+ UNGCPRO;
+ return Qnil;
+ }
+
+ /* Run the hook HOOK, giving each function the two args ARG1 and ARG2. */
+
+ void
+ run_hook_with_args_2 (hook, arg1, arg2)
+ Lisp_Object hook, arg1, arg2;
+ {
+ Lisp_Object temp[3];
+ temp[0] = hook;
+ temp[1] = arg1;
+ temp[2] = arg2;
+
+ Frun_hook_with_args (3, temp);
+ }
+
+ /* Apply fn to arg */
+ Lisp_Object
+ apply1 (fn, arg)
+ Lisp_Object fn, arg;
+ {
+ struct gcpro gcpro1;
+
+ GCPRO1 (fn);
+ if (NILP (arg))
+ RETURN_UNGCPRO (Ffuncall (1, &fn));
+ gcpro1.nvars = 2;
+ #ifdef NO_ARG_ARRAY
+ {
+ Lisp_Object args[2];
+ args[0] = fn;
+ args[1] = arg;
+ gcpro1.var = args;
+ RETURN_UNGCPRO (Fapply (2, args));
+ }
+ #else /* not NO_ARG_ARRAY */
+ RETURN_UNGCPRO (Fapply (2, &fn));
+ #endif /* not NO_ARG_ARRAY */
+ }
+
+ /* Call function fn on no arguments */
+ Lisp_Object
+ call0 (fn)
+ Lisp_Object fn;
+ {
+ struct gcpro gcpro1;
+
+ GCPRO1 (fn);
+ RETURN_UNGCPRO (Ffuncall (1, &fn));
+ }
+
+ /* Call function fn with 1 argument arg1 */
+ /* ARGSUSED */
+ Lisp_Object
+ call1 (fn, arg1)
+ Lisp_Object fn, arg1;
+ {
+ struct gcpro gcpro1;
+ #ifdef NO_ARG_ARRAY
+ Lisp_Object args[2];
+
+ args[0] = fn;
+ args[1] = arg1;
+ GCPRO1 (args[0]);
+ gcpro1.nvars = 2;
+ RETURN_UNGCPRO (Ffuncall (2, args));
+ #else /* not NO_ARG_ARRAY */
+ GCPRO1 (fn);
+ gcpro1.nvars = 2;
+ RETURN_UNGCPRO (Ffuncall (2, &fn));
+ #endif /* not NO_ARG_ARRAY */
+ }
+
+ /* Call function fn with 2 arguments arg1, arg2 */
+ /* ARGSUSED */
+ Lisp_Object
+ call2 (fn, arg1, arg2)
+ Lisp_Object fn, arg1, arg2;
+ {
+ struct gcpro gcpro1;
+ #ifdef NO_ARG_ARRAY
+ Lisp_Object args[3];
+ args[0] = fn;
+ args[1] = arg1;
+ args[2] = arg2;
+ GCPRO1 (args[0]);
+ gcpro1.nvars = 3;
+ RETURN_UNGCPRO (Ffuncall (3, args));
+ #else /* not NO_ARG_ARRAY */
+ GCPRO1 (fn);
+ gcpro1.nvars = 3;
+ RETURN_UNGCPRO (Ffuncall (3, &fn));
+ #endif /* not NO_ARG_ARRAY */
+ }
+
+ /* Call function fn with 3 arguments arg1, arg2, arg3 */
+ /* ARGSUSED */
+ Lisp_Object
+ call3 (fn, arg1, arg2, arg3)
+ Lisp_Object fn, arg1, arg2, arg3;
+ {
+ struct gcpro gcpro1;
+ #ifdef NO_ARG_ARRAY
+ Lisp_Object args[4];
+ args[0] = fn;
+ args[1] = arg1;
+ args[2] = arg2;
+ args[3] = arg3;
+ GCPRO1 (args[0]);
+ gcpro1.nvars = 4;
+ RETURN_UNGCPRO (Ffuncall (4, args));
+ #else /* not NO_ARG_ARRAY */
+ GCPRO1 (fn);
+ gcpro1.nvars = 4;
+ RETURN_UNGCPRO (Ffuncall (4, &fn));
+ #endif /* not NO_ARG_ARRAY */
+ }
+
+ /* Call function fn with 4 arguments arg1, arg2, arg3, arg4 */
+ /* ARGSUSED */
+ Lisp_Object
+ call4 (fn, arg1, arg2, arg3, arg4)
+ Lisp_Object fn, arg1, arg2, arg3, arg4;
+ {
+ struct gcpro gcpro1;
+ #ifdef NO_ARG_ARRAY
+ Lisp_Object args[5];
+ args[0] = fn;
+ args[1] = arg1;
+ args[2] = arg2;
+ args[3] = arg3;
+ args[4] = arg4;
+ GCPRO1 (args[0]);
+ gcpro1.nvars = 5;
+ RETURN_UNGCPRO (Ffuncall (5, args));
+ #else /* not NO_ARG_ARRAY */
+ GCPRO1 (fn);
+ gcpro1.nvars = 5;
+ RETURN_UNGCPRO (Ffuncall (5, &fn));
+ #endif /* not NO_ARG_ARRAY */
+ }
+
+ /* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5 */
+ /* ARGSUSED */
+ Lisp_Object
+ call5 (fn, arg1, arg2, arg3, arg4, arg5)
+ Lisp_Object fn, arg1, arg2, arg3, arg4, arg5;
+ {
+ struct gcpro gcpro1;
+ #ifdef NO_ARG_ARRAY
+ Lisp_Object args[6];
+ args[0] = fn;
+ args[1] = arg1;
+ args[2] = arg2;
+ args[3] = arg3;
+ args[4] = arg4;
+ args[5] = arg5;
+ GCPRO1 (args[0]);
+ gcpro1.nvars = 6;
+ RETURN_UNGCPRO (Ffuncall (6, args));
+ #else /* not NO_ARG_ARRAY */
+ GCPRO1 (fn);
+ gcpro1.nvars = 6;
+ RETURN_UNGCPRO (Ffuncall (6, &fn));
+ #endif /* not NO_ARG_ARRAY */
+ }
+
+ /* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6 */
+ /* ARGSUSED */
+ Lisp_Object
+ call6 (fn, arg1, arg2, arg3, arg4, arg5, arg6)
+ Lisp_Object fn, arg1, arg2, arg3, arg4, arg5, arg6;
+ {
+ struct gcpro gcpro1;
+ #ifdef NO_ARG_ARRAY
+ Lisp_Object args[7];
+ args[0] = fn;
+ args[1] = arg1;
+ args[2] = arg2;
+ args[3] = arg3;
+ args[4] = arg4;
+ args[5] = arg5;
+ args[6] = arg6;
+ GCPRO1 (args[0]);
+ gcpro1.nvars = 7;
+ RETURN_UNGCPRO (Ffuncall (7, args));
+ #else /* not NO_ARG_ARRAY */
+ GCPRO1 (fn);
+ gcpro1.nvars = 7;
+ RETURN_UNGCPRO (Ffuncall (7, &fn));
+ #endif /* not NO_ARG_ARRAY */
+ }
+
+ /* The caller should GCPRO all the elements of ARGS. */
+
+ DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0,
+ doc: /* Call first argument as a function, passing remaining arguments
to it.
+ Return the value that function returns.
+ Thus, (funcall 'cons 'x 'y) returns (x . y).
+ usage: (funcall FUNCTION &rest ARGUMENTS) */)
+ (nargs, args)
+ int nargs;
+ Lisp_Object *args;
+ {
+ Lisp_Object fun;
+ Lisp_Object funcar;
+ int numargs = nargs - 1;
+ Lisp_Object lisp_numargs;
+ Lisp_Object val;
+ struct backtrace backtrace;
+ register Lisp_Object *internal_args;
+ register int i;
+
+ QUIT;
+ if (consing_since_gc > gc_cons_threshold)
+ Fgarbage_collect ();
+
+ if (++lisp_eval_depth > max_lisp_eval_depth)
+ {
+ if (max_lisp_eval_depth < 100)
+ max_lisp_eval_depth = 100;
+ if (lisp_eval_depth > max_lisp_eval_depth)
+ error ("Lisp nesting exceeds max-lisp-eval-depth");
+ }
+
+ backtrace.next = backtrace_list;
+ backtrace_list = &backtrace;
+ backtrace.function = &args[0];
+ backtrace.args = &args[1];
+ backtrace.nargs = nargs - 1;
+ backtrace.evalargs = 0;
+ backtrace.debug_on_exit = 0;
+
+ if (debug_on_next_call)
+ do_debug_on_call (Qlambda);
+
+ retry:
+
+ fun = args[0];
+
+ fun = Findirect_function (fun);
+
+ if (SUBRP (fun))
+ {
+ if (numargs < XSUBR (fun)->min_args
+ || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs))
+ {
+ XSETFASTINT (lisp_numargs, numargs);
+ return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons
(lisp_numargs, Qnil)));
+ }
+
+ if (XSUBR (fun)->max_args == UNEVALLED)
+ return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+
+ if (XSUBR (fun)->max_args == MANY)
+ {
+ val = (*XSUBR (fun)->function) (numargs, args + 1);
+ goto done;
+ }
+
+ if (XSUBR (fun)->max_args > numargs)
+ {
+ internal_args = (Lisp_Object *) alloca (XSUBR (fun)->max_args *
sizeof (Lisp_Object));
+ bcopy (args + 1, internal_args, numargs * sizeof (Lisp_Object));
+ for (i = numargs; i < XSUBR (fun)->max_args; i++)
+ internal_args[i] = Qnil;
+ }
+ else
+ internal_args = args + 1;
+ switch (XSUBR (fun)->max_args)
+ {
+ case 0:
+ val = (*XSUBR (fun)->function) ();
+ goto done;
+ case 1:
+ val = (*XSUBR (fun)->function) (internal_args[0]);
+ goto done;
+ case 2:
+ val = (*XSUBR (fun)->function) (internal_args[0],
+ internal_args[1]);
+ goto done;
+ case 3:
+ val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1],
+ internal_args[2]);
+ goto done;
+ case 4:
+ val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1],
+ internal_args[2],
+ internal_args[3]);
+ goto done;
+ case 5:
+ val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1],
+ internal_args[2], internal_args[3],
+ internal_args[4]);
+ goto done;
+ case 6:
+ val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1],
+ internal_args[2], internal_args[3],
+ internal_args[4], internal_args[5]);
+ goto done;
+ case 7:
+ val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1],
+ internal_args[2], internal_args[3],
+ internal_args[4], internal_args[5],
+ internal_args[6]);
+ goto done;
+
+ case 8:
+ val = (*XSUBR (fun)->function) (internal_args[0], internal_args[1],
+ internal_args[2], internal_args[3],
+ internal_args[4], internal_args[5],
+ internal_args[6], internal_args[7]);
+ goto done;
+
+ default:
+
+ /* If a subr takes more than 8 arguments without using MANY
+ or UNEVALLED, we need to extend this function to support it.
+ Until this is done, there is no way to call the function. */
+ abort ();
+ }
+ }
+ if (COMPILEDP (fun))
+ val = funcall_lambda (fun, numargs, args + 1);
+ else
+ {
+ if (!CONSP (fun))
+ return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+ funcar = Fcar (fun);
+ if (!SYMBOLP (funcar))
+ return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+ if (EQ (funcar, Qlambda))
+ val = funcall_lambda (fun, numargs, args + 1);
+ else if (EQ (funcar, Qautoload))
+ {
+ do_autoload (fun, args[0]);
+ goto retry;
+ }
+ else
+ return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+ }
+ done:
+ lisp_eval_depth--;
+ if (backtrace.debug_on_exit)
+ val = call_debugger (Fcons (Qexit, Fcons (val, Qnil)));
+ backtrace_list = backtrace.next;
+ return val;
+ }
+
+ Lisp_Object
+ apply_lambda (fun, args, eval_flag)
+ Lisp_Object fun, args;
+ int eval_flag;
+ {
+ Lisp_Object args_left;
+ Lisp_Object numargs;
+ register Lisp_Object *arg_vector;
+ struct gcpro gcpro1, gcpro2, gcpro3;
+ register int i;
+ register Lisp_Object tem;
+
+ numargs = Flength (args);
+ arg_vector = (Lisp_Object *) alloca (XINT (numargs) * sizeof (Lisp_Object));
+ args_left = args;
+
+ GCPRO3 (*arg_vector, args_left, fun);
+ gcpro1.nvars = 0;
+
+ for (i = 0; i < XINT (numargs);)
+ {
+ tem = Fcar (args_left), args_left = Fcdr (args_left);
+ if (eval_flag) tem = Feval (tem);
+ arg_vector[i++] = tem;
+ gcpro1.nvars = i;
+ }
+
+ UNGCPRO;
+
+ if (eval_flag)
+ {
+ backtrace_list->args = arg_vector;
+ backtrace_list->nargs = i;
+ }
+ backtrace_list->evalargs = 0;
+ tem = funcall_lambda (fun, XINT (numargs), arg_vector);
+
+ /* Do the debug-on-exit now, while arg_vector still exists. */
+ if (backtrace_list->debug_on_exit)
+ tem = call_debugger (Fcons (Qexit, Fcons (tem, Qnil)));
+ /* Don't do it again when we return to eval. */
+ backtrace_list->debug_on_exit = 0;
+ return tem;
+ }
+
+ /* Apply a Lisp function FUN to the NARGS evaluated arguments in ARG_VECTOR
+ and return the result of evaluation.
+ FUN must be either a lambda-expression or a compiled-code object. */
+
+ static Lisp_Object
+ funcall_lambda (fun, nargs, arg_vector)
+ Lisp_Object fun;
+ int nargs;
+ register Lisp_Object *arg_vector;
+ {
+ Lisp_Object val, syms_left, next;
+ int count = SPECPDL_INDEX ();
+ int i, optional, rest;
+
+ if (CONSP (fun))
+ {
+ syms_left = XCDR (fun);
+ if (CONSP (syms_left))
+ syms_left = XCAR (syms_left);
+ else
+ return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+ }
+ else if (COMPILEDP (fun))
+ syms_left = AREF (fun, COMPILED_ARGLIST);
+ else
+ abort ();
+
+ i = optional = rest = 0;
+ for (; CONSP (syms_left); syms_left = XCDR (syms_left))
+ {
+ QUIT;
+
+ next = XCAR (syms_left);
+ while (!SYMBOLP (next))
+ next = Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+
+ if (EQ (next, Qand_rest))
+ rest = 1;
+ else if (EQ (next, Qand_optional))
+ optional = 1;
+ else if (rest)
+ {
+ specbind (next, Flist (nargs - i, &arg_vector[i]));
+ i = nargs;
+ }
+ else if (i < nargs)
+ specbind (next, arg_vector[i++]);
+ else if (!optional)
+ return Fsignal (Qwrong_number_of_arguments,
+ Fcons (fun, Fcons (make_number (nargs), Qnil)));
+ else
+ specbind (next, Qnil);
+ }
+
+ if (!NILP (syms_left))
+ return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+ else if (i < nargs)
+ return Fsignal (Qwrong_number_of_arguments,
+ Fcons (fun, Fcons (make_number (nargs), Qnil)));
+
+ if (CONSP (fun))
+ val = Fprogn (XCDR (XCDR (fun)));
+ else
+ {
+ /* If we have not actually read the bytecode string
+ and constants vector yet, fetch them from the file. */
+ if (CONSP (AREF (fun, COMPILED_BYTECODE)))
+ Ffetch_bytecode (fun);
+ val = Fbyte_code (AREF (fun, COMPILED_BYTECODE),
+ AREF (fun, COMPILED_CONSTANTS),
+ AREF (fun, COMPILED_STACK_DEPTH));
+ }
+
+ return unbind_to (count, val);
+ }
+
+ DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode,
+ 1, 1, 0,
+ doc: /* If byte-compiled OBJECT is lazy-loaded, fetch it now. */)
+ (object)
+ Lisp_Object object;
+ {
+ Lisp_Object tem;
+
+ if (COMPILEDP (object) && CONSP (AREF (object, COMPILED_BYTECODE)))
+ {
+ tem = read_doc_string (AREF (object, COMPILED_BYTECODE));
+ if (!CONSP (tem))
+ {
+ tem = AREF (object, COMPILED_BYTECODE);
+ if (CONSP (tem) && STRINGP (XCAR (tem)))
+ error ("Invalid byte code in %s", SDATA (XCAR (tem)));
+ else
+ error ("Invalid byte code");
+ }
+ AREF (object, COMPILED_BYTECODE) = XCAR (tem);
+ AREF (object, COMPILED_CONSTANTS) = XCDR (tem);
+ }
+ return object;
+ }
+
+ void
+ grow_specpdl ()
+ {
+ register int count = SPECPDL_INDEX ();
+ if (specpdl_size >= max_specpdl_size)
+ {
+ if (max_specpdl_size < 400)
+ max_specpdl_size = 400;
+ if (specpdl_size >= max_specpdl_size)
+ {
+ if (!NILP (Vdebug_on_error))
+ /* Leave room for some specpdl in the debugger. */
+ max_specpdl_size = specpdl_size + 100;
+ Fsignal (Qerror,
+ Fcons (build_string ("Variable binding depth exceeds
max-specpdl-size"), Qnil));
+ }
+ }
+ specpdl_size *= 2;
+ if (specpdl_size > max_specpdl_size)
+ specpdl_size = max_specpdl_size;
+ specpdl = (struct specbinding *) xrealloc (specpdl, specpdl_size * sizeof
(struct specbinding));
+ specpdl_ptr = specpdl + count;
+ }
+
+ void
+ specbind (symbol, value)
+ Lisp_Object symbol, value;
+ {
+ Lisp_Object ovalue;
+ Lisp_Object valcontents;
+
+ CHECK_SYMBOL (symbol);
+ if (specpdl_ptr == specpdl + specpdl_size)
+ grow_specpdl ();
+
+ /* The most common case is that of a non-constant symbol with a
+ trivial value. Make that as fast as we can. */
+ valcontents = SYMBOL_VALUE (symbol);
+ if (!MISCP (valcontents) && !SYMBOL_CONSTANT_P (symbol))
+ {
+ specpdl_ptr->symbol = symbol;
+ specpdl_ptr->old_value = valcontents;
+ specpdl_ptr->func = NULL;
+ ++specpdl_ptr;
+ SET_SYMBOL_VALUE (symbol, value);
+ }
+ else
+ {
+ Lisp_Object valcontents;
+
+ ovalue = find_symbol_value (symbol);
+ specpdl_ptr->func = 0;
+ specpdl_ptr->old_value = ovalue;
+
+ valcontents = XSYMBOL (symbol)->value;
+
+ if (BUFFER_LOCAL_VALUEP (valcontents)
+ || SOME_BUFFER_LOCAL_VALUEP (valcontents)
+ || BUFFER_OBJFWDP (valcontents))
+ {
+ Lisp_Object where, current_buffer;
+
+ current_buffer = Fcurrent_buffer ();
+
+ /* For a local variable, record both the symbol and which
+ buffer's or frame's value we are saving. */
+ if (!NILP (Flocal_variable_p (symbol, Qnil)))
+ where = current_buffer;
+ else if (!BUFFER_OBJFWDP (valcontents)
+ && XBUFFER_LOCAL_VALUE (valcontents)->found_for_frame)
+ where = XBUFFER_LOCAL_VALUE (valcontents)->frame;
+ else
+ where = Qnil;
+
+ /* We're not using the `unused' slot in the specbinding
+ structure because this would mean we have to do more
+ work for simple variables. */
+ specpdl_ptr->symbol = Fcons (symbol, Fcons (where, current_buffer));
+
+ /* If SYMBOL is a per-buffer variable which doesn't have a
+ buffer-local value here, make the `let' change the global
+ value by changing the value of SYMBOL in all buffers not
+ having their own value. This is consistent with what
+ happens with other buffer-local variables. */
+ if (NILP (where)
+ && BUFFER_OBJFWDP (valcontents))
+ {
+ ++specpdl_ptr;
+ Fset_default (symbol, value);
+ return;
+ }
+ }
+ else
+ specpdl_ptr->symbol = symbol;
+
+ specpdl_ptr++;
+ if (BUFFER_OBJFWDP (ovalue) || KBOARD_OBJFWDP (ovalue))
+ store_symval_forwarding (symbol, ovalue, value, NULL);
+ else
+ set_internal (symbol, value, 0, 1);
+ }
+ }
+
+ void
+ record_unwind_protect (function, arg)
+ Lisp_Object (*function) P_ ((Lisp_Object));
+ Lisp_Object arg;
+ {
+ if (specpdl_ptr == specpdl + specpdl_size)
+ grow_specpdl ();
+ specpdl_ptr->func = function;
+ specpdl_ptr->symbol = Qnil;
+ specpdl_ptr->old_value = arg;
+ specpdl_ptr++;
+ }
+
+ Lisp_Object
+ unbind_to (count, value)
+ int count;
+ Lisp_Object value;
+ {
+ int quitf = !NILP (Vquit_flag);
+ struct gcpro gcpro1;
+
+ GCPRO1 (value);
+ Vquit_flag = Qnil;
+
+ while (specpdl_ptr != specpdl + count)
+ {
+ /* Copy the binding, and decrement specpdl_ptr, before we do
+ the work to unbind it. We decrement first
+ so that an error in unbinding won't try to unbind
+ the same entry again, and we copy the binding first
+ in case more bindings are made during some of the code we run. */
+
+ struct specbinding this_binding;
+ this_binding = *--specpdl_ptr;
+
+ if (this_binding.func != 0)
+ (*this_binding.func) (this_binding.old_value);
+ /* If the symbol is a list, it is really (SYMBOL WHERE
+ . CURRENT-BUFFER) where WHERE is either nil, a buffer, or a
+ frame. If WHERE is a buffer or frame, this indicates we
+ bound a variable that had a buffer-local or frame-local
+ binding. WHERE nil means that the variable had the default
+ value when it was bound. CURRENT-BUFFER is the buffer that
+ was current when the variable was bound. */
+ else if (CONSP (this_binding.symbol))
+ {
+ Lisp_Object symbol, where;
+
+ symbol = XCAR (this_binding.symbol);
+ where = XCAR (XCDR (this_binding.symbol));
+
+ if (NILP (where))
+ Fset_default (symbol, this_binding.old_value);
+ else if (BUFFERP (where))
+ set_internal (symbol, this_binding.old_value, XBUFFER (where), 1);
+ else
+ set_internal (symbol, this_binding.old_value, NULL, 1);
+ }
+ else
+ {
+ /* If variable has a trivial value (no forwarding), we can
+ just set it. No need to check for constant symbols here,
+ since that was already done by specbind. */
+ if (!MISCP (SYMBOL_VALUE (this_binding.symbol)))
+ SET_SYMBOL_VALUE (this_binding.symbol, this_binding.old_value);
+ else
+ set_internal (this_binding.symbol, this_binding.old_value, 0, 1);
+ }
+ }
+
+ if (NILP (Vquit_flag) && quitf)
+ Vquit_flag = Qt;
+
+ UNGCPRO;
+ return value;
+ }
+
+ DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0,
+ doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to
FLAG.
+ The debugger is entered when that frame exits, if the flag is non-nil. */)
+ (level, flag)
+ Lisp_Object level, flag;
+ {
+ register struct backtrace *backlist = backtrace_list;
+ register int i;
+
+ CHECK_NUMBER (level);
+
+ for (i = 0; backlist && i < XINT (level); i++)
+ {
+ backlist = backlist->next;
+ }
+
+ if (backlist)
+ backlist->debug_on_exit = !NILP (flag);
+
+ return flag;
+ }
+
+ DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "",
+ doc: /* Print a trace of Lisp function calls currently active.
+ Output stream used is value of `standard-output'. */)
+ ()
+ {
+ register struct backtrace *backlist = backtrace_list;
+ register int i;
+ Lisp_Object tail;
+ Lisp_Object tem;
+ extern Lisp_Object Vprint_level;
+ struct gcpro gcpro1;
+
+ XSETFASTINT (Vprint_level, 3);
+
+ tail = Qnil;
+ GCPRO1 (tail);
+
+ while (backlist)
+ {
+ write_string (backlist->debug_on_exit ? "* " : " ", 2);
+ if (backlist->nargs == UNEVALLED)
+ {
+ Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil);
+ write_string ("\n", -1);
+ }
+ else
+ {
+ tem = *backlist->function;
+ Fprin1 (tem, Qnil); /* This can QUIT */
+ write_string ("(", -1);
+ if (backlist->nargs == MANY)
+ {
+ for (tail = *backlist->args, i = 0;
+ !NILP (tail);
+ tail = Fcdr (tail), i++)
+ {
+ if (i) write_string (" ", -1);
+ Fprin1 (Fcar (tail), Qnil);
+ }
+ }
+ else
+ {
+ for (i = 0; i < backlist->nargs; i++)
+ {
+ if (i) write_string (" ", -1);
+ Fprin1 (backlist->args[i], Qnil);
+ }
+ }
+ write_string (")\n", -1);
+ }
+ backlist = backlist->next;
+ }
+
+ Vprint_level = Qnil;
+ UNGCPRO;
+ return Qnil;
+ }
+
+ DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 1, NULL,
+ doc: /* Return the function and arguments NFRAMES up from current
execution point.
+ If that frame has not evaluated the arguments yet (or is a special form),
+ the value is (nil FUNCTION ARG-FORMS...).
+ If that frame has evaluated its arguments and called its function already,
+ the value is (t FUNCTION ARG-VALUES...).
+ A &rest arg is represented as the tail of the list ARG-VALUES.
+ FUNCTION is whatever was supplied as car of evaluated list,
+ or a lambda expression for macro calls.
+ If NFRAMES is more than the number of frames, the value is nil. */)
+ (nframes)
+ Lisp_Object nframes;
+ {
+ register struct backtrace *backlist = backtrace_list;
+ register int i;
+ Lisp_Object tem;
+
+ CHECK_NATNUM (nframes);
+
+ /* Find the frame requested. */
+ for (i = 0; backlist && i < XFASTINT (nframes); i++)
+ backlist = backlist->next;
+
+ if (!backlist)
+ return Qnil;
+ if (backlist->nargs == UNEVALLED)
+ return Fcons (Qnil, Fcons (*backlist->function, *backlist->args));
+ else
+ {
+ if (backlist->nargs == MANY)
+ tem = *backlist->args;
+ else
+ tem = Flist (backlist->nargs, backlist->args);
+
+ return Fcons (Qt, Fcons (*backlist->function, tem));
+ }
+ }
+
+
+ void
+ mark_backtrace ()
+ {
+ register struct backtrace *backlist;
+ register int i;
+
+ for (backlist = backtrace_list; backlist; backlist = backlist->next)
+ {
+ mark_object (*backlist->function);
+
+ if (backlist->nargs == UNEVALLED || backlist->nargs == MANY)
+ i = 0;
+ else
+ i = backlist->nargs - 1;
+ for (; i >= 0; i--)
+ mark_object (backlist->args[i]);
+ }
+ }
+
+ void
+ syms_of_eval ()
+ {
+ DEFVAR_INT ("max-specpdl-size", &max_specpdl_size,
+ doc: /* *Limit on number of Lisp variable bindings &
unwind-protects.
+ If Lisp code tries to make more than this many at once,
+ an error is signaled.
+ You can safely use a value considerably larger than the default value,
+ if that proves inconveniently small. However, if you increase it too far,
+ Emacs could run out of memory trying to make the stack bigger. */);
+
+ DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth,
+ doc: /* *Limit on depth in `eval', `apply' and `funcall' before
error.
+
+ This limit serves to catch infinite recursions for you before they cause
+ actual stack overflow in C, which would be fatal for Emacs.
+ You can safely make it considerably larger than its default value,
+ if that proves inconveniently small. However, if you increase it too far,
+ Emacs could overflow the real C stack, and crash. */);
+
+ DEFVAR_LISP ("quit-flag", &Vquit_flag,
+ doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is
non-nil.
+ Typing C-g sets `quit-flag' non-nil, regardless of `inhibit-quit'. */);
+ Vquit_flag = Qnil;
+
+ DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit,
+ doc: /* Non-nil inhibits C-g quitting from happening immediately.
+ Note that `quit-flag' will still be set by typing C-g,
+ so a quit will be signaled as soon as `inhibit-quit' is nil.
+ To prevent this happening, set `quit-flag' to nil
+ before making `inhibit-quit' nil. */);
+ Vinhibit_quit = Qnil;
+
+ Qinhibit_quit = intern ("inhibit-quit");
+ staticpro (&Qinhibit_quit);
+
+ Qautoload = intern ("autoload");
+ staticpro (&Qautoload);
+
+ Qdebug_on_error = intern ("debug-on-error");
+ staticpro (&Qdebug_on_error);
+
+ Qmacro = intern ("macro");
+ staticpro (&Qmacro);
+
+ Qdeclare = intern ("declare");
+ staticpro (&Qdeclare);
+
+ /* Note that the process handling also uses Qexit, but we don't want
+ to staticpro it twice, so we just do it here. */
+ Qexit = intern ("exit");
+ staticpro (&Qexit);
+
+ Qinteractive = intern ("interactive");
+ staticpro (&Qinteractive);
+
+ Qcommandp = intern ("commandp");
+ staticpro (&Qcommandp);
+
+ Qdefun = intern ("defun");
+ staticpro (&Qdefun);
+
+ Qdefvar = intern ("defvar");
+ staticpro (&Qdefvar);
+
+ Qand_rest = intern ("&rest");
+ staticpro (&Qand_rest);
+
+ Qand_optional = intern ("&optional");
+ staticpro (&Qand_optional);
+
+ DEFVAR_LISP ("stack-trace-on-error", &Vstack_trace_on_error,
+ doc: /* *Non-nil means errors display a backtrace buffer.
+ More precisely, this happens for any error that is handled
+ by the editor command loop.
+ If the value is a list, an error only means to display a backtrace
+ if one of its condition symbols appears in the list. */);
+ Vstack_trace_on_error = Qnil;
+
+ DEFVAR_LISP ("debug-on-error", &Vdebug_on_error,
+ doc: /* *Non-nil means enter debugger if an error is signaled.
+ Does not apply to errors handled by `condition-case' or those
+ matched by `debug-ignored-errors'.
+ If the value is a list, an error only means to enter the debugger
+ if one of its condition symbols appears in the list.
+ When you evaluate an expression interactively, this variable
+ is temporarily non-nil if `eval-expression-debug-on-error' is non-nil.
+ See also variable `debug-on-quit'. */);
+ Vdebug_on_error = Qnil;
+
+ DEFVAR_LISP ("debug-ignored-errors", &Vdebug_ignored_errors,
+ doc: /* *List of errors for which the debugger should not be called.
+ Each element may be a condition-name or a regexp that matches error messages.
+ If any element applies to a given error, that error skips the debugger
+ and just returns to top level.
+ This overrides the variable `debug-on-error'.
+ It does not apply to errors handled by `condition-case'. */);
+ Vdebug_ignored_errors = Qnil;
+
+ DEFVAR_BOOL ("debug-on-quit", &debug_on_quit,
+ doc: /* *Non-nil means enter debugger if quit is signaled (C-g,
for example).
+ Does not apply if quit is handled by a `condition-case'.
+ When you evaluate an expression interactively, this variable
+ is temporarily non-nil if `eval-expression-debug-on-quit' is non-nil. */);
+ debug_on_quit = 0;
+
+ DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call,
+ doc: /* Non-nil means enter debugger before next `eval', `apply'
or `funcall'. */);
+
+ DEFVAR_BOOL ("debugger-may-continue", &debugger_may_continue,
+ doc: /* Non-nil means debugger may continue execution.
+ This is nil when the debugger is called under circumstances where it
+ might not be safe to continue. */);
+ debugger_may_continue = 1;
+
+ DEFVAR_LISP ("debugger", &Vdebugger,
+ doc: /* Function to call to invoke debugger.
+ If due to frame exit, args are `exit' and the value being returned;
+ this function's value will be returned instead of that.
+ If due to error, args are `error' and a list of the args to `signal'.
+ If due to `apply' or `funcall' entry, one arg, `lambda'.
+ If due to `eval' entry, one arg, t. */);
+ Vdebugger = Qnil;
+
+ DEFVAR_LISP ("signal-hook-function", &Vsignal_hook_function,
+ doc: /* If non-nil, this is a function for `signal' to call.
+ It receives the same arguments that `signal' was given.
+ The Edebug package uses this to regain control. */);
+ Vsignal_hook_function = Qnil;
+
+ DEFVAR_LISP ("debug-on-signal", &Vdebug_on_signal,
+ doc: /* *Non-nil means call the debugger regardless of condition
handlers.
+ Note that `debug-on-error', `debug-on-quit' and friends
+ still determine whether to handle the particular condition. */);
+ Vdebug_on_signal = Qnil;
+
+ DEFVAR_LISP ("macro-declaration-function", &Vmacro_declaration_function,
+ doc: /* Function to process declarations in a macro definition.
+ The function will be called with two args MACRO and DECL.
+ MACRO is the name of the macro being defined.
+ DECL is a list `(declare ...)' containing the declarations.
+ The value the function returns is not used. */);
+ Vmacro_declaration_function = Qnil;
+
+ Vrun_hooks = intern ("run-hooks");
+ staticpro (&Vrun_hooks);
+
+ staticpro (&Vautoload_queue);
+ Vautoload_queue = Qnil;
+ staticpro (&Vsignaling_function);
+ Vsignaling_function = Qnil;
+
+ defsubr (&Sor);
+ defsubr (&Sand);
+ defsubr (&Sif);
+ defsubr (&Scond);
+ defsubr (&Sprogn);
+ defsubr (&Sprog1);
+ defsubr (&Sprog2);
+ defsubr (&Ssetq);
+ defsubr (&Squote);
+ defsubr (&Sfunction);
+ defsubr (&Sdefun);
+ defsubr (&Sdefmacro);
+ defsubr (&Sdefvar);
+ defsubr (&Sdefvaralias);
+ defsubr (&Sdefconst);
+ defsubr (&Suser_variable_p);
+ defsubr (&Slet);
+ defsubr (&SletX);
+ defsubr (&Swhile);
+ defsubr (&Smacroexpand);
+ defsubr (&Scatch);
+ defsubr (&Sthrow);
+ defsubr (&Sunwind_protect);
+ defsubr (&Scondition_case);
+ defsubr (&Ssignal);
+ defsubr (&Sinteractive_p);
+ defsubr (&Scommandp);
+ defsubr (&Sautoload);
+ defsubr (&Seval);
+ defsubr (&Sapply);
+ defsubr (&Sfuncall);
+ defsubr (&Srun_hooks);
+ defsubr (&Srun_hook_with_args);
+ defsubr (&Srun_hook_with_args_until_success);
+ defsubr (&Srun_hook_with_args_until_failure);
+ defsubr (&Sfetch_bytecode);
+ defsubr (&Sbacktrace_debug);
+ defsubr (&Sbacktrace);
+ defsubr (&Sbacktrace_frame);
+ }
+
+ /* arch-tag: 014a07aa-33ab-4a8f-a3d2-ee8a4a9ff7fb
+ (do not change this comment) */
| [Prev in Thread] |
Current Thread |
[Next in Thread] |
- [Emacs-diffs] Changes to emacs/src/eval.c [gnus-5_10-branch],
Miles Bader <=