Initial revision

1 files changed, 2332 insertions, 0 deletions

diff --git a/src/eval.c b/src/eval.c
new file mode 100644
index 00000000000..f2cb96e911b
--- /dev/null
+++ b/src/eval.c
@@ -0,0 +1,2332 @@
+/* Evaluator for GNU Emacs Lisp interpreter.
+   Copyright (C) 1985, 1986, 1987 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#include "config.h"
+#include "lisp.h"
+#ifdef HAVE_X_WINDOWS
+#include "xterm.h"
+#endif
+
+#ifndef standalone
+#include "commands.h"
+#else
+#define INTERACTIVE 1
+#endif
+
+#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;
+
+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;
+  };
+
+struct catchtag *catchlist;
+
+Lisp_Object Qautoload, Qmacro, Qexit, Qinteractive, Qcommandp, Qdefun;
+Lisp_Object Vquit_flag, Vinhibit_quit;
+Lisp_Object Qmocklisp_arguments, Vmocklisp_arguments, Qmocklisp;
+Lisp_Object Qand_rest, Qand_optional;
+Lisp_Object Qdebug_on_error;
+
+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.  */
+struct specbinding *specpdl_ptr;
+
+/* Maximum size allowed for specpdl allocation */
+int max_specpdl_size;
+
+/* Depth in Lisp evaluations and function calls.  */
+int lisp_eval_depth;
+
+/* Maximum allowed depth in Lisp evaluations and function calls.  */
+int max_lisp_eval_depth;
+
+/* Nonzero means enter debugger before next function call */
+int debug_on_next_call;
+
+/* Nonzero means display a backtrace if an error
+ is handled by the command loop's error handler. */
+int stack_trace_on_error;
+
+/* Nonzero means enter debugger if an error
+ is handled by the command loop's error handler. */
+int debug_on_error;
+
+/* Nonzero means enter debugger if a quit signal
+ is handled by the command loop's error handler. */
+int debug_on_quit;
+
+/* Nonzero means we are trying to enter the debugger.
+   This is to prevent recursive attempts.  */
+int entering_debugger;
+
+Lisp_Object Vdebugger;
+
+void specbind (), record_unwind_protect ();
+
+Lisp_Object funcall_lambda ();
+extern Lisp_Object ml_apply (); /* Apply a mocklisp function to unevaluated argument list */
+
+init_eval_once ()
+{
+  specpdl_size = 50;
+  specpdl = (struct specbinding *) malloc (specpdl_size * sizeof (struct specbinding));
+  max_specpdl_size = 600;
+  max_lisp_eval_depth = 200;
+}
+
+init_eval ()
+{
+  specpdl_ptr = specpdl;
+  catchlist = 0;
+  handlerlist = 0;
+  backtrace_list = 0;
+  Vquit_flag = Qnil;
+  debug_on_next_call = 0;
+  lisp_eval_depth = 0;
+  entering_debugger = 0;
+}
+
+Lisp_Object
+call_debugger (arg)
+     Lisp_Object arg;
+{
+  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;
+  debug_on_next_call = 0;
+  entering_debugger = 1;
+  return apply1 (Vdebugger, arg);
+}
+
+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,
+  "Eval args until one of them yields non-nil, then return that value.\n\
+The remaining args are not evalled at all.\n\
+If all args return nil, return nil.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object val;
+  Lisp_Object args_left;
+  struct gcpro gcpro1;
+
+  if (NULL(args))
+    return Qnil;
+
+  args_left = args;
+  GCPRO1 (args_left);
+
+  do
+    {
+      val = Feval (Fcar (args_left));
+      if (!NULL (val))
+        break;
+      args_left = Fcdr (args_left);
+    }
+  while (!NULL(args_left));
+
+  UNGCPRO;
+  return val;
+}
+
+DEFUN ("and", Fand, Sand, 0, UNEVALLED, 0,
+  "Eval args until one of them yields nil, then return nil.\n\
+The remaining args are not evalled at all.\n\
+If no arg yields nil, return the last arg's value.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object val;
+  Lisp_Object args_left;
+  struct gcpro gcpro1;
+
+  if (NULL(args))
+    return Qt;
+
+  args_left = args;
+  GCPRO1 (args_left);
+
+  do
+    {
+      val = Feval (Fcar (args_left));
+      if (NULL (val))
+        break;
+      args_left = Fcdr (args_left);
+    }
+  while (!NULL(args_left));
+
+  UNGCPRO;
+  return val;
+}
+
+DEFUN ("if", Fif, Sif, 2, UNEVALLED, 0,
+  "(if COND THEN ELSE...): if COND yields non-nil, do THEN, else do ELSE...\n\
+Returns the value of THEN or the value of the last of the ELSE's.\n\
+THEN must be one expression, but ELSE... can be zero or more expressions.\n\
+If COND yields nil, and there are no ELSE's, the value is nil.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object cond;
+  struct gcpro gcpro1;
+
+  GCPRO1 (args);
+  cond = Feval (Fcar (args));
+  UNGCPRO;
+
+  if (!NULL (cond))
+    return Feval (Fcar (Fcdr (args)));
+  return Fprogn (Fcdr (Fcdr (args)));
+}
+
+DEFUN ("cond", Fcond, Scond, 0, UNEVALLED, 0,
+  "(cond CLAUSES...): try each clause until one succeeds.\n\
+Each clause looks like (CONDITION BODY...).  CONDITION is evaluated\n\
+and, if the value is non-nil, this clause succeeds:\n\
+then the expressions in BODY are evaluated and the last one's\n\
+value is the value of the cond-form.\n\
+If no clause succeeds, cond returns nil.\n\
+If a clause has one element, as in (CONDITION),\n\
+CONDITION's value if non-nil is returned from the cond-form.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object clause, val;
+  struct gcpro gcpro1;
+
+  val = Qnil;
+  GCPRO1 (args);
+  while (!NULL (args))
+    {
+      clause = Fcar (args);
+      val = Feval (Fcar (clause));
+      if (!NULL (val))
+        {
+          if (!EQ (XCONS (clause)->cdr, Qnil))
+            val = Fprogn (XCONS (clause)->cdr);
+          break;
+        }
+      args = XCONS (args)->cdr;
+    }
+  UNGCPRO;
+
+  return val;
+}
+
+DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0,
+  "(progn BODY...): eval BODY forms sequentially and return value of last one.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object val, tem;
+  Lisp_Object args_left;
+  struct gcpro gcpro1;
+
+  /* In Mocklisp code, symbols at the front of the progn arglist
+   are to be bound to zero. */
+  if (!EQ (Vmocklisp_arguments, Qt))
+    {
+      val = make_number (0);
+      while (!NULL (args) && (tem = Fcar (args), XTYPE (tem) == Lisp_Symbol))
+        {
+          QUIT;
+          specbind (tem, val), args = Fcdr (args);
+        }
+    }
+
+  if (NULL(args))
+    return Qnil;
+
+  args_left = args;
+  GCPRO1 (args_left);
+
+  do
+    {
+      val = Feval (Fcar (args_left));
+      args_left = Fcdr (args_left);
+    }
+  while (!NULL(args_left));
+
+  UNGCPRO;
+  return val;
+}
+
+DEFUN ("prog1", Fprog1, Sprog1, 1, UNEVALLED, 0,
+  "(prog1 FIRST BODY...): eval FIRST and BODY sequentially; value from FIRST.\n\
+The value of FIRST is saved during the evaluation of the remaining args,\n\
+whose values are discarded.")
+  (args)
+     Lisp_Object args;
+{
+  Lisp_Object val;
+  register Lisp_Object args_left;
+  struct gcpro gcpro1, gcpro2;
+  register int argnum = 0;
+
+  if (NULL(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 (!NULL(args_left));
+
+  UNGCPRO;
+  return val;
+}
+
+DEFUN ("prog2", Fprog2, Sprog2, 2, UNEVALLED, 0,
+  "(prog1 X Y BODY...): eval X, Y and BODY sequentially; value from Y.\n\
+The value of Y is saved during the evaluation of the remaining args,\n\
+whose values are discarded.")
+  (args)
+     Lisp_Object args;
+{
+  Lisp_Object val;
+  register Lisp_Object args_left;
+  struct gcpro gcpro1, gcpro2;
+  register int argnum = -1;
+
+  val = Qnil;
+
+  if (NULL(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 (!NULL(args_left));
+
+  UNGCPRO;
+  return val;
+}
+
+DEFUN ("setq", Fsetq, Ssetq, 0, UNEVALLED, 0,
+  "(setq SYM VAL SYM VAL ...): set each SYM to the value of its VAL.\n\
+The SYMs are not evaluated.  Thus (setq x y) sets x to the value of y.\n\
+Each SYM is set before the next VAL is computed.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object args_left;
+  register Lisp_Object val, sym;
+  struct gcpro gcpro1;
+
+  if (NULL(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 (!NULL(args_left));
+
+  UNGCPRO;
+  return val;
+}
+     
+DEFUN ("quote", Fquote, Squote, 1, UNEVALLED, 0,
+  "Return the argument, without evaluating it.  `(quote x)' yields `x'.")
+  (args)
+     Lisp_Object args;
+{
+  return Fcar (args);
+}
+     
+DEFUN ("function", Ffunction, Sfunction, 1, UNEVALLED, 0,
+  "Like `quote', but preferred for objects which are functions.\n\
+In byte compilation, `function' causes its argument to be compiled.\n\
+`quote' cannot do that.")
+  (args)
+     Lisp_Object args;
+{
+  return Fcar (args);
+}
+
+DEFUN ("interactive-p", Finteractive_p, Sinteractive_p, 0, 0, 0,
+  "Return t if function in which this appears was called interactively.\n\
+This means that the function was called with call-interactively (which\n\
+includes being called as the binding of a key)\n\
+and input is currently coming from the keyboard (not in keyboard macro).")
+  ()
+{
+  register struct backtrace *btp;
+  register Lisp_Object fun;
+
+  if (!INTERACTIVE)
+    return Qnil;
+
+  /*  Unless the object was compiled, skip the frame of interactive-p itself
+      (if interpreted) or the frame of byte-code (if called from
+      compiled function).  */
+  btp = backtrace_list;
+  if (! XTYPE (*btp->function) == Lisp_Compiled)
+    btp = btp->next;
+  for (;
+       btp && (btp->nargs == UNEVALLED
+               || EQ (*btp->function, Qbytecode));
+       btp = btp->next)
+    {}
+  /* btp now points at the frame of the innermost function
+     that DOES eval its args.
+     If it is a built-in function (such as load or eval-region)
+     return nil.  */
+  fun = *btp->function;
+  while (XTYPE (fun) == Lisp_Symbol)
+    {
+      QUIT;
+      fun = Fsymbol_function (fun);
+    }
+  if (XTYPE (fun) == Lisp_Subr)
+    return Qnil;
+  /* 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 Qt;
+  return Qnil;
+}
+
+DEFUN ("defun", Fdefun, Sdefun, 2, UNEVALLED, 0,
+  "(defun NAME ARGLIST [DOCSTRING] BODY...): define NAME as a function.\n\
+The definition is (lambda ARGLIST [DOCSTRING] BODY...).\n\
+See also the function `interactive'.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object fn_name;
+  register Lisp_Object defn;
+
+  fn_name = Fcar (args);
+  defn = Fcons (Qlambda, Fcdr (args));
+  if (!NULL (Vpurify_flag))
+    defn = Fpurecopy (defn);
+  Ffset (fn_name, defn);
+  return fn_name;
+}
+
+DEFUN ("defmacro", Fdefmacro, Sdefmacro, 2, UNEVALLED, 0,
+  "(defmacro NAME ARGLIST [DOCSTRING] BODY...): define NAME as a macro.\n\
+The definition is (macro lambda ARGLIST [DOCSTRING] BODY...).\n\
+When the macro is called, as in (NAME ARGS...),\n\
+the function (lambda ARGLIST BODY...) is applied to\n\
+the list ARGS... as it appears in the expression,\n\
+and the result should be a form to be evaluated instead of the original.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object fn_name;
+  register Lisp_Object defn;
+
+  fn_name = Fcar (args);
+  defn = Fcons (Qmacro, Fcons (Qlambda, Fcdr (args)));
+  if (!NULL (Vpurify_flag))
+    defn = Fpurecopy (defn);
+  Ffset (fn_name, defn);
+  return fn_name;
+}
+
+DEFUN ("defvar", Fdefvar, Sdefvar, 1, UNEVALLED, 0,
+  "(defvar SYMBOL INITVALUE DOCSTRING): define SYMBOL as a variable.\n\
+You are not required to define a variable in order to use it,\n\
+but the definition can supply documentation and an initial value\n\
+in a way that tags can recognize.\n\n\
+INITVALUE is evaluated, and used to set SYMBOL, only if SYMBOL's value is void.\n\
+If SYMBOL is buffer-local, its default value is initialized in this way.\n\
+INITVALUE and DOCSTRING are optional.\n\
+If DOCSTRING starts with *, this variable is identified as a user option.\n\
+ This means that M-x set-variable and M-x edit-options recognize it.\n\
+If INITVALUE is missing, SYMBOL's value is not set.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object sym, tem;
+
+  sym = Fcar (args);
+  tem = Fcdr (args);
+  if (!NULL (tem))
+    {
+      tem = Fdefault_boundp (sym);
+      if (NULL (tem))
+        Fset_default (sym, Feval (Fcar (Fcdr (args))));
+    }
+  tem = Fcar (Fcdr (Fcdr (args)));
+  if (!NULL (tem))
+    {
+      if (!NULL (Vpurify_flag))
+        tem = Fpurecopy (tem);
+      Fput (sym, Qvariable_documentation, tem);
+    }
+  return sym;
+}
+
+DEFUN ("defconst", Fdefconst, Sdefconst, 2, UNEVALLED, 0,
+  "(defconst SYMBOL INITVALUE DOCSTRING): define SYMBOL as a constant variable.\n\
+The intent is that programs do not change this value, but users may.\n\
+Always sets the value of SYMBOL to the result of evalling INITVALUE.\n\
+If SYMBOL is buffer-local, its default value is initialized in this way.\n\
+DOCSTRING is optional.\n\
+If DOCSTRING starts with *, this variable is identified as a user option.\n\
+ This means that M-x set-variable and M-x edit-options recognize it.\n\n\
+Note: do not use `defconst' for user options in libraries that are not\n\
+normally loaded, since it is useful for users to be able to specify\n\
+their own values for such variables before loading the library.\n\
+Since `defconst' unconditionally assigns the variable,\n\
+it would override the user's choice.")
+  (args)
+     Lisp_Object args;
+{
+  register Lisp_Object sym, tem;
+
+  sym = Fcar (args);
+  Fset_default (sym, Feval (Fcar (Fcdr (args))));
+  tem = Fcar (Fcdr (Fcdr (args)));
+  if (!NULL (tem))
+    {
+      if (!NULL (Vpurify_flag))
+        tem = Fpurecopy (tem);
+      Fput (sym, Qvariable_documentation, tem);
+    }
+  return sym;
+}
+
+DEFUN ("user-variable-p", Fuser_variable_p, Suser_variable_p, 1, 1, 0,
+  "Returns t if VARIABLE is intended to be set and modified by users.\n\
+\(The alternative is a variable used internally in a Lisp program.)\n\
+Determined by whether the first character of the documentation\n\
+for the variable is \"*\"")
+  (variable)
+     Lisp_Object variable;
+{
+  Lisp_Object documentation;
+  
+  documentation = Fget (variable, Qvariable_documentation);
+  if (XTYPE (documentation) == Lisp_Int && XINT (documentation) < 0)
+    return Qt;
+  if ((XTYPE (documentation) == Lisp_String) &&
+      ((unsigned char) XSTRING (documentation)->data[0] == '*'))
+    return Qt;
+  return Qnil;
+}  
+
+DEFUN ("let*", FletX, SletX, 1, UNEVALLED, 0,
+  "(let* VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\
+The value of the last form in BODY is returned.\n\
+Each element of VARLIST is a symbol (which is bound to nil)\n\
+or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\
+Each VALUEFORM can refer to the symbols already bound by this VARLIST.")
+  (args)
+     Lisp_Object args;
+{
+  Lisp_Object varlist, val, elt;
+  int count = specpdl_ptr - specpdl;
+  struct gcpro gcpro1, gcpro2, gcpro3;
+
+  GCPRO3 (args, elt, varlist);
+
+  varlist = Fcar (args);
+  while (!NULL (varlist))
+    {
+      QUIT;
+      elt = Fcar (varlist);
+      if (XTYPE (elt) == Lisp_Symbol)
+        specbind (elt, Qnil);
+      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,
+  "(let VARLIST BODY...): bind variables according to VARLIST then eval BODY.\n\
+The value of the last form in BODY is returned.\n\
+Each element of VARLIST is a symbol (which is bound to nil)\n\
+or a list (SYMBOL VALUEFORM) (which binds SYMBOL to the value of VALUEFORM).\n\
+All the VALUEFORMs are evalled before any symbols are bound.")
+  (args)
+     Lisp_Object args;
+{
+  Lisp_Object *temps, tem;
+  register Lisp_Object elt, varlist;
+  int count = specpdl_ptr - specpdl;
+  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; !NULL (varlist); varlist = Fcdr (varlist))
+    {
+      QUIT;
+      elt = Fcar (varlist);
+      if (XTYPE (elt) == Lisp_Symbol)
+        temps [argnum++] = Qnil;
+      else
+        temps [argnum++] = Feval (Fcar (Fcdr (elt)));
+      gcpro2.nvars = argnum;
+    }
+  UNGCPRO;
+
+  varlist = Fcar (args);
+  for (argnum = 0; !NULL (varlist); varlist = Fcdr (varlist))
+    {
+      elt = Fcar (varlist);
+      tem = temps[argnum++];
+      if (XTYPE (elt) == Lisp_Symbol)
+        specbind (elt, tem);
+      else
+        specbind (Fcar (elt), tem);
+    }
+
+  elt = Fprogn (Fcdr (args));
+  return unbind_to (count, elt);
+}
+
+DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0,
+  "(while TEST BODY...): if TEST yields non-nil, eval BODY... and repeat.\n\
+The order of execution is thus TEST, BODY, TEST, BODY and so on\n\
+until TEST returns nil.")
+  (args)
+     Lisp_Object args;
+{
+  Lisp_Object test, body, tem;
+  struct gcpro gcpro1, gcpro2;
+
+  GCPRO2 (test, body);
+
+  test = Fcar (args);
+  body = Fcdr (args);
+  while (tem = Feval (test), !NULL (tem))
+    {
+      QUIT;
+      Fprogn (body);
+    }
+
+  UNGCPRO;
+  return Qnil;
+}
+
+DEFUN ("macroexpand", Fmacroexpand, Smacroexpand, 1, 2, 0,
+  "Return result of expanding macros at top level of FORM.\n\
+If FORM is not a macro call, it is returned unchanged.\n\
+Otherwise, the macro is expanded and the expansion is considered\n\
+in place of FORM.  When a non-macro-call results, it is returned.\n\n\
+The second optional arg ENVIRONMENT species an environment of macro\n\
+definitions to shadow the loaded ones for use in file byte-compilation.")
+  (form, env)
+     register Lisp_Object form;
+     Lisp_Object env;
+{
+  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 (XTYPE (form) != Lisp_Cons)
+        break;
+      sym = XCONS (form)->car;
+      /* Detect  ((macro lambda ...) ...)  */
+      if (XTYPE (sym) == Lisp_Cons
+          && EQ (XCONS (sym)->car, Qmacro))
+        {
+          expander = XCONS (sym)->cdr;
+          goto explicit;
+        }
+      if (XTYPE (sym) != Lisp_Symbol)
+        break;
+      /* Trace symbols aliases to other symbols
+         until we get a symbol that is not an alias.  */
+      while (1)
+        {
+          QUIT;
+          tem = Fassq (sym, env);
+          if (NULL (tem))
+            {
+              def = XSYMBOL (sym)->function;
+              if (XTYPE (def) == Lisp_Symbol && !EQ (def, Qunbound))
+                sym = def;
+              else
+                break;
+            }
+          else
+            {
+#if 0  /* This is turned off because it caused an element (foo . bar)
+          to have the effect of defining foo as an alias for the macro bar.
+          That is inconsistent; bar should be a function to expand foo.  */
+              if (XTYPE (tem) == Lisp_Cons
+                  && XTYPE (XCONS (tem)->cdr) == Lisp_Symbol)
+                sym = XCONS (tem)->cdr;
+              else
+#endif
+                break;
+            }
+        }
+      /* Right now TEM is the result from SYM in ENV,
+         and if TEM is nil then DEF is SYM's function definition.  */
+      if (NULL (tem))
+        {
+          /* SYM is not mentioned in ENV.
+             Look at its function definition.  */
+          if (EQ (def, Qunbound)
+              || XTYPE (def) != Lisp_Cons)
+            /* Not defined or definition not suitable */
+            break;
+          if (EQ (XCONS (def)->car, Qautoload))
+            {
+              /* Autoloading function: will it be a macro when loaded?  */
+              tem = Fcar (Fnthcdr (make_number (4), def));
+              if (NULL (tem))
+                break;
+              /* Yes, load it and try again.  */
+              do_autoload (def, sym);
+              continue;
+            }
+          else if (!EQ (XCONS (def)->car, Qmacro))
+            break;
+          else expander = XCONS (def)->cdr;
+        }
+      else
+        {
+          expander = XCONS (tem)->cdr;
+          if (NULL (expander))
+            break;
+        }
+    explicit:
+      form = apply1 (expander, XCONS (form)->cdr);
+    }
+  return form;
+}
+
+DEFUN ("catch", Fcatch, Scatch, 1, UNEVALLED, 0,
+  "(catch TAG BODY...): eval BODY allowing nonlocal exits using `throw'.\n\
+TAG is evalled to get the tag to use.  Then the BODY is executed.\n\
+Within BODY, (throw TAG) with same tag exits BODY and exits this `catch'.\n\
+If no throw happens, `catch' returns the value of the last BODY form.\n\
+If a throw happens, it specifies the value to return from `catch'.")
+  (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_ptr - specpdl;
+  c.poll_suppress_count = poll_suppress_count;
+  c.gcpro = gcprolist;
+  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;
+}
+
+/* Discard from the catchlist all catch tags back through CATCH.
+   Before each catch is discarded, unbind all special bindings
+   made within that catch.  Also, when discarding a catch that
+   corresponds to a condition handler, discard that handler.
+
+   At the end, restore some static info saved in CATCH.
+
+   This is used for correct unwinding in Fthrow and Fsignal,
+   before doing the longjmp that actually destroys the stack frames
+   in which these handlers and catches reside.  */
+
+static void
+unbind_catch (catch)
+     struct catchtag *catch;
+{
+  register int last_time;
+
+  do
+    {
+      last_time = catchlist == catch;
+      unbind_to (catchlist->pdlcount, Qnil);
+      handlerlist = catchlist->handlerlist;
+      catchlist = catchlist->next;
+    }
+  while (! last_time);
+
+  gcprolist = catch->gcpro;
+  backtrace_list = catch->backlist;
+  lisp_eval_depth = catch->lisp_eval_depth;
+}
+
+DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0,
+  "(throw TAG VALUE): throw to the catch for TAG and return VALUE from it.\n\
+Both TAG and VALUE are evalled.")
+  (tag, val)
+     register Lisp_Object tag, val;
+{
+  register struct catchtag *c;
+
+  while (1)
+    {
+      if (!NULL (tag))
+        for (c = catchlist; c; c = c->next)
+          {
+            if (EQ (c->tag, tag))
+              {
+                /* Restore the polling-suppression count.  */
+                if (c->poll_suppress_count > poll_suppress_count)
+                  abort ();
+                while (c->poll_suppress_count < poll_suppress_count)
+                  start_polling ();
+                c->val = val;
+                unbind_catch (c);
+                _longjmp (c->jmp, 1);
+              }
+          }
+      tag = Fsignal (Qno_catch, Fcons (tag, Fcons (val, Qnil)));
+    }
+}
+
+
+DEFUN ("unwind-protect", Funwind_protect, Sunwind_protect, 1, UNEVALLED, 0,
+  "Do BODYFORM, protecting with UNWINDFORMS.\n\
+Usage looks like (unwind-protect BODYFORM UNWINDFORMS...).\n\
+If BODYFORM completes normally, its value is returned\n\
+after executing the UNWINDFORMS.\n\
+If BODYFORM exits nonlocally, the UNWINDFORMS are executed anyway.")
+  (args)
+     Lisp_Object args;
+{
+  Lisp_Object val;
+  int count = specpdl_ptr - specpdl;
+
+  record_unwind_protect (0, 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,
+  "Regain control when an error is signaled.\n\
+Usage looks like (condition-case VAR BODYFORM HANDLERS...).\n\
+executes BODYFORM and returns its value if no error happens.\n\
+Each element of HANDLERS looks like (CONDITION-NAME BODY...)\n\
+where the BODY is made of Lisp expressions.\n\n\
+A handler is applicable to an error\n\
+if CONDITION-NAME is one of the error's condition names.\n\
+If an error happens, the first applicable handler is run.\n\
+\n\
+When a handler handles an error,\n\
+control returns to the condition-case and the handler BODY... is executed\n\
+with VAR bound to (SIGNALED-CONDITIONS . SIGNAL-DATA).\n\
+VAR may be nil; then you do not get access to the signal information.\n\
+\n\
+The value of the last BODY form is returned from the condition-case.\n\
+See also the function `signal' for more info.")
+  (args)
+     Lisp_Object args;
+{
+  Lisp_Object val;
+  struct catchtag c;
+  struct handler h;
+  register Lisp_Object tem;
+
+  tem = Fcar (args);
+  CHECK_SYMBOL (tem, 0);
+
+  c.tag = Qnil;
+  c.val = Qnil;
+  c.backlist = backtrace_list;
+  c.handlerlist = handlerlist;
+  c.lisp_eval_depth = lisp_eval_depth;
+  c.pdlcount = specpdl_ptr - specpdl;
+  c.poll_suppress_count = poll_suppress_count;
+  c.gcpro = gcprolist;
+  if (_setjmp (c.jmp))
+    {
+      if (!NULL (h.var))
+        specbind (h.var, Fcdr (c.val));
+      val = Fprogn (Fcdr (Fcar (c.val)));
+      unbind_to (c.pdlcount, Qnil);
+      return val;
+    }
+  c.next = catchlist;
+  catchlist = &c;
+  h.var = Fcar (args);
+  h.handler = Fcdr (Fcdr (args));
+  
+  for (val = h.handler; ! NULL (val); val = Fcdr (val))
+    {
+      tem = Fcar (val);
+      if ((!NULL (tem)) &&
+          (!CONSP (tem) || (XTYPE (XCONS (tem)->car) != Lisp_Symbol)))
+        error ("Invalid condition handler", tem);
+    }
+  
+  h.next = handlerlist;
+  h.poll_suppress_count = poll_suppress_count;
+  h.tag = &c;
+  handlerlist = &h;
+
+  val = Feval (Fcar (Fcdr (args)));
+  catchlist = c.next;
+  handlerlist = h.next;
+  return val;
+}
+
+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;
+
+  c.tag = Qnil;
+  c.val = Qnil;
+  c.backlist = backtrace_list;
+  c.handlerlist = handlerlist;
+  c.lisp_eval_depth = lisp_eval_depth;
+  c.pdlcount = specpdl_ptr - specpdl;
+  c.poll_suppress_count = poll_suppress_count;
+  c.gcpro = gcprolist;
+  if (_setjmp (c.jmp))
+    {
+      return (*hfun) (Fcdr (c.val));
+    }
+  c.next = catchlist;
+  catchlist = &c;
+  h.handler = handlers;
+  h.var = Qnil;
+  h.poll_suppress_count = poll_suppress_count;
+  h.next = handlerlist;
+  h.tag = &c;
+  handlerlist = &h;
+
+  val = (*bfun) ();
+  catchlist = c.next;
+  handlerlist = h.next;
+  return val;
+}
+
+static Lisp_Object find_handler_clause ();
+
+DEFUN ("signal", Fsignal, Ssignal, 2, 2, 0,
+  "Signal an error.  Args are SIGNAL-NAME, and associated DATA.\n\
+This function does not return.\n\n\
+A signal name is a symbol with an `error-conditions' property\n\
+that is a list of condition names.\n\
+A handler for any of those names will get to handle this signal.\n\
+The symbol `error' should normally be one of them.\n\
+\n\
+DATA should be a list.  Its elements are printed as part of the error message.\n\
+If the signal is handled, DATA is made available to the handler.\n\
+See also the function `condition-case'.")
+  (sig, data)
+     Lisp_Object sig, data;
+{
+  register struct handler *allhandlers = handlerlist;
+  Lisp_Object conditions;
+  extern int gc_in_progress;
+  extern int waiting_for_input;
+  Lisp_Object debugger_value;
+
+  quit_error_check ();
+  immediate_quit = 0;
+  if (gc_in_progress || waiting_for_input)
+    abort ();
+
+  TOTALLY_UNBLOCK_INPUT;
+
+  conditions = Fget (sig, Qerror_conditions);
+
+  for (; handlerlist; handlerlist = handlerlist->next)
+    {
+      register Lisp_Object clause;
+      clause = find_handler_clause (handlerlist->handler, conditions,
+                                    sig, data, &debugger_value);
+
+#if 0 /* Most callers are not prepared to handle gc if this returns.
+         So, since this feature is not very useful, take it out.  */
+      /* If have called debugger and user wants to continue,
+         just return nil.  */
+      if (EQ (clause, Qlambda))
+        return debugger_value;
+#else
+      if (EQ (clause, Qlambda))
+        error ("Returning a value from an error is no longer supported");
+#endif
+
+      if (!NULL (clause))
+        {
+          struct handler *h = handlerlist;
+          /* Restore the polling-suppression count.  */
+          if (h->poll_suppress_count > poll_suppress_count)
+            abort ();
+          while (h->poll_suppress_count < poll_suppress_count)
+            start_polling ();
+          handlerlist = allhandlers;
+          unbind_catch (h->tag);
+          h->tag->val = Fcons (clause, Fcons (sig, data));
+          _longjmp (h->tag->jmp, 1);
+        }
+    }
+
+  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, sig, data, &debugger_value);
+  Fthrow (Qtop_level, Qt);
+}
+
+/* Value of Qlambda means we have called debugger and
+   user has continued.  Store value returned fromdebugger
+   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;
+  register Lisp_Object tem1;
+
+  if (EQ (handlers, Qt))  /* t is used by handlers for all conditions, set up by C code.  */
+    return Qt;
+  if (EQ (handlers, Qerror))  /* error is used similarly, but means display a backtrace too */
+    {
+      if (stack_trace_on_error)
+        internal_with_output_to_temp_buffer ("*Backtrace*", Fbacktrace, Qnil);
+      if (!entering_debugger
+          && EQ (sig, Qquit) ? debug_on_quit : debug_on_error)
+        {
+          int count = specpdl_ptr - specpdl;
+          specbind (Qdebug_on_error, Qnil);
+          *debugger_value_ptr =
+            call_debugger (Fcons (Qerror,
+                                  Fcons (Fcons (sig, data),
+                                         Qnil)));
+          return unbind_to (count, Qlambda);
+        }
+      return Qt;
+    }
+  for (h = handlers; CONSP (h); h = Fcdr (h))
+    {
+      tem1 = Fcar (h);
+      if (!CONSP (tem1))
+        continue;
+      tem = Fmemq (Fcar (tem1), conditions);
+      if (!NULL (tem))
+        return tem1;
+    }
+  return Qnil;
+}
+
+/* dump an error message; called like printf */
+
+/* VARARGS 1 */
+void
+error (m, a1, a2, a3)
+     char *m;
+{
+  char buf[200];
+  sprintf (buf, m, a1, a2, a3);
+
+  while (1)
+    Fsignal (Qerror, Fcons (build_string (buf), Qnil));
+}
+
+DEFUN ("commandp", Fcommandp, Scommandp, 1, 1, 0,
+  "T if FUNCTION makes provisions for interactive calling.\n\
+This means it contains a description for how to read arguments to give it.\n\
+The value is nil for an invalid function or a symbol with no function\n\
+definition.\n\
+\n\
+Interactively callable functions include strings and vectors (treated\n\
+as keyboard macros), lambda-expressions that contain a top-level call\n\
+to `interactive', autoload definitions made by `autoload' with non-nil\n\
+fourth argument, and some of the built-in functions of Lisp.\n\
+\n\
+Also, a symbol satisfies `commandp' if its function definition does so.")
+  (function)
+     Lisp_Object function;
+{
+  register Lisp_Object fun;
+  register Lisp_Object funcar;
+  register Lisp_Object tem;
+  register int i = 0;
+
+  fun = function;
+
+  /* Dereference symbols, but avoid infinte loops.  Eech.  */
+  while (XTYPE (fun) == Lisp_Symbol)
+    {
+      if (++i > 10) return Qnil;
+      tem = Ffboundp (fun);
+      if (NULL (tem)) return Qnil;
+      fun = Fsymbol_function (fun);
+    }
+
+  /* Emacs primitives are interactive if their DEFUN specifies an
+     interactive spec.  */
+  if (XTYPE (fun) == Lisp_Subr)
+    {
+      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 (XTYPE (fun) == Lisp_Compiled)
+    return (XVECTOR (fun)->size > COMPILED_INTERACTIVE
+            ? Qt : Qnil);
+
+  /* Strings and vectors are keyboard macros.  */
+  if (XTYPE (fun) == Lisp_String
+      || XTYPE (fun) == Lisp_Vector)
+    return Qt;
+
+  /* Lists may represent commands.  */
+  if (!CONSP (fun))
+    return Qnil;
+  funcar = Fcar (fun);
+  if (XTYPE (funcar) != Lisp_Symbol)
+    return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+  if (EQ (funcar, Qlambda))
+    return Fassq (Qinteractive, Fcdr (Fcdr (fun)));
+  if (EQ (funcar, Qmocklisp))
+    return Qt;  /* All mocklisp functions can be called interactively */
+  if (EQ (funcar, Qautoload))
+    return Fcar (Fcdr (Fcdr (Fcdr (fun))));
+  else
+    return Qnil;
+}
+
+/* ARGSUSED */
+DEFUN ("autoload", Fautoload, Sautoload, 2, 5, 0,
+  "Define FUNCTION to autoload from FILE.\n\
+FUNCTION is a symbol; FILE is a file name string to pass to `load'.\n\
+Third arg DOCSTRING is documentation for the function.\n\
+Fourth arg INTERACTIVE if non-nil says function can be called interactively.\n\
+Fifth arg MACRO if non-nil says the function is really a macro.\n\
+Third through fifth args give info about the real definition.\n\
+They default to nil.\n\
+If FUNCTION is already defined other than as an autoload,\n\
+this does nothing and returns nil.")
+  (function, file, docstring, interactive, macro)
+     Lisp_Object function, file, docstring, interactive, macro;
+{
+#ifdef NO_ARG_ARRAY
+  Lisp_Object args[4];
+#endif
+
+  CHECK_SYMBOL (function, 0);
+  CHECK_STRING (file, 1);
+
+  /* If function is defined and not as an autoload, don't override */
+  if (!EQ (XSYMBOL (function)->function, Qunbound)
+      && !(XTYPE (XSYMBOL (function)->function) == Lisp_Cons
+           && EQ (XCONS (XSYMBOL (function)->function)->car, Qautoload)))
+    return Qnil;
+
+#ifdef NO_ARG_ARRAY
+  args[0] = file;
+  args[1] = docstring;
+  args[2] = interactive;
+  args[3] = macro;
+
+  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 = Fcar (queue);
+      second = Fcdr (first);
+      first = Fcar (first);
+      if (EQ (second, Qnil))
+        Vfeatures = first;
+      else
+        Ffset (first, second);
+      queue = Fcdr (queue);
+    }
+  return Qnil;
+}
+
+do_autoload (fundef, funname)
+     Lisp_Object fundef, funname;
+{
+  int count = specpdl_ptr - specpdl;
+  Lisp_Object fun, val;
+
+  fun = funname;
+  CHECK_SYMBOL (funname, 0);
+
+  /* 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);
+  /* Once loading finishes, don't undo it.  */
+  Vautoload_queue = Qt;
+  unbind_to (count, Qnil);
+
+  while (XTYPE (fun) == Lisp_Symbol)
+    {
+      QUIT;
+      val = XSYMBOL (fun)->function;
+      if (EQ (val, Qunbound))
+        Fsymbol_function (fun); /* Get the right kind of error! */
+      fun = val;
+    }
+  if (XTYPE (fun) == Lisp_Cons
+      && EQ (XCONS (fun)->car, Qautoload))
+    error ("Autoloading failed to define function %s",
+           XSYMBOL (funname)->name->data);
+}
+
+DEFUN ("eval", Feval, Seval, 1, 1, 0,
+  "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 (XTYPE (form) == Lisp_Symbol)
+    {
+      if (EQ (Vmocklisp_arguments, Qt))
+        return Fsymbol_value (form);
+      val = Fsymbol_value (form);
+      if (NULL (val))
+        XFASTINT (val) = 0;
+      else if (EQ (val, Qt))
+        XFASTINT (val) = 1;
+      return val;
+    }
+  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 = original_fun;
+  while (XTYPE (fun) == Lisp_Symbol)
+    {
+      QUIT;
+      val = XSYMBOL (fun)->function;
+      if (EQ (val, Qunbound))
+        Fsymbol_function (fun); /* Get the right kind of error! */
+      fun = val;
+    }
+
+  if (XTYPE (fun) == Lisp_Subr)
+    {
+      Lisp_Object numargs;
+      Lisp_Object argvals[7];
+      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 (!NULL (args_left))
+            {
+              vals[argnum++] = Feval (Fcar (args_left));
+              args_left = Fcdr (args_left);
+              gcpro3.nvars = argnum;
+            }
+          UNGCPRO;
+
+          backtrace.args = vals;
+          backtrace.nargs = XINT (numargs);
+
+          val = (*XSUBR (fun)->function) (XINT (numargs), vals);
+          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;
+
+        default:
+          error ("Ffuncall doesn't handle that number of arguments.");
+          goto done;
+        }
+    }
+  if (XTYPE (fun) == Lisp_Compiled)
+    val = apply_lambda (fun, original_args, 1);
+  else
+    {
+      if (!CONSP (fun))
+        return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+      funcar = Fcar (fun);
+      if (XTYPE (funcar) != Lisp_Symbol)
+        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 if (EQ (funcar, Qmocklisp))
+        val = ml_apply (fun, original_args);
+      else
+        return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+    }
+ done:
+  if (!EQ (Vmocklisp_arguments, Qt))
+    {
+      if (NULL (val))
+        XFASTINT (val) = 0;
+      else if (EQ (val, Qt))
+        XFASTINT (val) = 1;
+    }
+  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,
+  "Call FUNCTION with our remaining args, using our last arg as list of args.\n\
+Thus, (apply '+ 1 2 '(3 4)) returns 10.")
+  (nargs, args)
+     int nargs;
+     Lisp_Object *args;
+{
+  register int i, numargs;
+  register Lisp_Object spread_arg;
+  register Lisp_Object *funcall_args;
+  struct gcpro gcpro1;
+  Lisp_Object fun;
+
+  fun = args [0];
+  funcall_args = 0;
+  spread_arg = args [nargs - 1];
+  CHECK_LIST (spread_arg, nargs);
+  
+  numargs = XINT (Flength (spread_arg));
+
+  if (numargs == 0)
+    return Ffuncall (nargs - 1, args);
+  else if (numargs == 1)
+    {
+      args [nargs - 1] = XCONS (spread_arg)->car;
+      return Ffuncall (nargs, args);
+    }
+
+  numargs = nargs - 2 + numargs;
+
+  while (XTYPE (fun) == Lisp_Symbol)
+    {
+      QUIT;
+      fun = XSYMBOL (fun)->function;
+      if (EQ (fun, Qunbound))
+        {
+          /* Let funcall get the error */
+          fun = args[0];
+          goto funcall;
+        }
+    }
+
+  if (XTYPE (fun) == Lisp_Subr)
+    {
+      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;
+        }
+    }
+ 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));
+  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 (!NULL (spread_arg))
+    {
+      funcall_args [i++] = XCONS (spread_arg)->car;
+      spread_arg = XCONS (spread_arg)->cdr;
+    }
+  
+  GCPRO1 (*funcall_args);
+  gcpro1.nvars = numargs + 1;
+  {
+    Lisp_Object val = Ffuncall (numargs + 1, funcall_args);
+    UNGCPRO;
+    return val;
+  }
+}
+
+/* Apply fn to arg */
+Lisp_Object
+apply1 (fn, arg)
+     Lisp_Object fn, arg;
+{
+  if (NULL (arg))
+    return Ffuncall (1, &fn);
+#ifdef NO_ARG_ARRAY
+  {
+    Lisp_Object args[2];
+    args[0] = fn;
+    args[1] = arg;
+    return Fapply (2, args);
+  }
+#else /* not NO_ARG_ARRAY */
+  return Fapply (2, &fn);
+#endif /* not NO_ARG_ARRAY */
+}
+
+/* Call function fn on no arguments */
+Lisp_Object
+call0 (fn)
+     Lisp_Object fn;
+{
+  return Ffuncall (1, &fn);
+}
+
+/* Call function fn with argument arg */
+/* ARGSUSED */
+Lisp_Object
+call1 (fn, arg)
+     Lisp_Object fn, arg;
+{
+#ifdef NO_ARG_ARRAY
+  Lisp_Object args[2];
+  args[0] = fn;
+  args[1] = arg;
+  return Ffuncall (2, args);
+#else /* not NO_ARG_ARRAY */
+  return Ffuncall (2, &fn);
+#endif /* not NO_ARG_ARRAY */
+}
+
+/* Call function fn with arguments arg, arg1 */
+/* ARGSUSED */
+Lisp_Object
+call2 (fn, arg, arg1)
+     Lisp_Object fn, arg, arg1;
+{
+#ifdef NO_ARG_ARRAY
+  Lisp_Object args[3];
+  args[0] = fn;
+  args[1] = arg;
+  args[2] = arg1;
+  return Ffuncall (3, args);
+#else /* not NO_ARG_ARRAY */
+  return Ffuncall (3, &fn);
+#endif /* not NO_ARG_ARRAY */
+}
+
+/* Call function fn with arguments arg, arg1, arg2 */
+/* ARGSUSED */
+Lisp_Object
+call3 (fn, arg, arg1, arg2)
+     Lisp_Object fn, arg, arg1, arg2;
+{
+#ifdef NO_ARG_ARRAY
+  Lisp_Object args[4];
+  args[0] = fn;
+  args[1] = arg;
+  args[2] = arg1;
+  args[3] = arg2;
+  return Ffuncall (4, args);
+#else /* not NO_ARG_ARRAY */
+  return Ffuncall (4, &fn);
+#endif /* not NO_ARG_ARRAY */
+}
+
+DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0,
+  "Call first argument as a function, passing remaining arguments to it.\n\
+Thus, (funcall 'cons 'x 'y) returns (x . y).")
+  (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];
+  while (XTYPE (fun) == Lisp_Symbol)
+    {
+      QUIT;
+      val = XSYMBOL (fun)->function;
+      if (EQ (val, Qunbound))
+        Fsymbol_function (fun); /* Get the right kind of error! */
+      fun = val;
+    }
+
+  if (XTYPE (fun) == Lisp_Subr)
+    {
+      if (numargs < XSUBR (fun)->min_args
+          || (XSUBR (fun)->max_args >= 0 && XSUBR (fun)->max_args < numargs))
+        {
+          XFASTINT (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;
+
+        default:
+          error ("funcall: this number of args not handled.");
+        }
+    }
+  if (XTYPE (fun) == Lisp_Compiled)
+    val = funcall_lambda (fun, numargs, args + 1);
+  else
+    {
+      if (!CONSP (fun))
+        return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+      funcar = Fcar (fun);
+      if (XTYPE (funcar) != Lisp_Symbol)
+        return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+      if (EQ (funcar, Qlambda))
+        val = funcall_lambda (fun, numargs, args + 1);
+      else if (EQ (funcar, Qmocklisp))
+        val = ml_apply (fun, Flist (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.  */
+
+Lisp_Object
+funcall_lambda (fun, nargs, arg_vector)
+     Lisp_Object fun;
+     int nargs;
+     register Lisp_Object *arg_vector;
+{
+  Lisp_Object val, tem;
+  register Lisp_Object syms_left;
+  Lisp_Object numargs;
+  register Lisp_Object next;
+  int count = specpdl_ptr - specpdl;
+  register int i;
+  int optional = 0, rest = 0;
+
+  specbind (Qmocklisp_arguments, Qt);   /* t means NOT mocklisp! */
+
+  XFASTINT (numargs) = nargs;
+
+  if (XTYPE (fun) == Lisp_Cons)
+    syms_left = Fcar (Fcdr (fun));
+  else if (XTYPE (fun) == Lisp_Compiled)
+    syms_left = XVECTOR (fun)->contents[COMPILED_ARGLIST];
+  else abort ();
+
+  i = 0;
+  for (; !NULL (syms_left); syms_left = Fcdr (syms_left))
+    {
+      QUIT;
+      next = Fcar (syms_left);
+      if (EQ (next, Qand_rest))
+        rest = 1;
+      else if (EQ (next, Qand_optional))
+        optional = 1;
+      else if (rest)
+        {
+          specbind (Fcar (syms_left), Flist (nargs - i, &arg_vector[i]));
+          i = nargs;
+        }
+      else if (i < nargs)
+        {
+          tem = arg_vector[i++];
+          specbind (next, tem);
+        }
+      else if (!optional)
+        return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil)));
+      else
+        specbind (next, Qnil);
+    }
+
+  if (i < nargs)
+    return Fsignal (Qwrong_number_of_arguments, Fcons (fun, Fcons (numargs, Qnil)));
+
+  if (XTYPE (fun) == Lisp_Cons)
+    val = Fprogn (Fcdr (Fcdr (fun)));
+  else
+    val = Fbyte_code (XVECTOR (fun)->contents[COMPILED_BYTECODE],
+                      XVECTOR (fun)->contents[COMPILED_CONSTANTS],
+                      XVECTOR (fun)->contents[COMPILED_STACK_DEPTH]);
+  return unbind_to (count, val);
+}
+
+void
+grow_specpdl ()
+{
+  register int count = specpdl_ptr - specpdl;
+  if (specpdl_size >= max_specpdl_size)
+    {
+      if (max_specpdl_size < 400)
+        max_specpdl_size = 400;
+      if (specpdl_size >= max_specpdl_size)
+        {
+          Fsignal (Qerror,
+                   Fcons (build_string ("Variable binding depth exceeds max-specpdl-size"), Qnil));
+          max_specpdl_size *= 2;
+        }
+    }
+  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;
+{
+  extern void store_symval_forwarding (); /* in eval.c */
+  Lisp_Object ovalue;
+
+  if (specpdl_ptr == specpdl + specpdl_size)
+    grow_specpdl ();
+  specpdl_ptr->symbol = symbol;
+  specpdl_ptr->func = 0;
+  ovalue = XSYMBOL (symbol)->value;
+  specpdl_ptr->old_value = EQ (ovalue, Qunbound) ? Qunbound : Fsymbol_value (symbol);
+  specpdl_ptr++;
+  if (XTYPE (ovalue) == Lisp_Buffer_Objfwd)
+    store_symval_forwarding (symbol, ovalue, value);
+  else
+    Fset (symbol, value);
+}
+
+void
+record_unwind_protect (function, arg)
+     Lisp_Object (*function)();
+     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 = !NULL (Vquit_flag);
+  struct gcpro gcpro1;
+
+  GCPRO1 (value);
+
+  Vquit_flag = Qnil;
+
+  while (specpdl_ptr != specpdl + count)
+    {
+      --specpdl_ptr;
+      if (specpdl_ptr->func != 0)
+        (*specpdl_ptr->func) (specpdl_ptr->old_value);
+      /* Note that a "binding" of nil is really an unwind protect,
+        so in that case the "old value" is a list of forms to evaluate.  */
+      else if (NULL (specpdl_ptr->symbol))
+        Fprogn (specpdl_ptr->old_value);
+      else
+        Fset (specpdl_ptr->symbol, specpdl_ptr->old_value);
+    }
+  if (NULL (Vquit_flag) && quitf) Vquit_flag = Qt;
+
+  UNGCPRO;
+
+  return value;
+}
+
+#if 0
+
+/* Get the value of symbol's global binding, even if that binding
+ is not now dynamically visible.  */
+
+Lisp_Object
+top_level_value (symbol)
+     Lisp_Object symbol;
+{
+  register struct specbinding *ptr = specpdl;
+
+  CHECK_SYMBOL (symbol, 0);
+  for (; ptr != specpdl_ptr; ptr++)
+    {
+      if (EQ (ptr->symbol, symbol))
+        return ptr->old_value;
+    }
+  return Fsymbol_value (symbol);
+}
+
+Lisp_Object
+top_level_set (symbol, newval)
+     Lisp_Object symbol, newval;
+{
+  register struct specbinding *ptr = specpdl;
+
+  CHECK_SYMBOL (symbol, 0);
+  for (; ptr != specpdl_ptr; ptr++)
+    {
+      if (EQ (ptr->symbol, symbol))
+        {
+          ptr->old_value = newval;
+          return newval;
+        }
+    }
+  return Fset (symbol, newval);
+}  
+
+#endif /* 0 */
+
+DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0,
+  "Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.\n\
+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, 0);
+
+  for (i = 0; backlist && i < XINT (level); i++)
+    {
+      backlist = backlist->next;
+    }
+
+  if (backlist)
+    backlist->debug_on_exit = !NULL (flag);
+
+  return flag;
+}
+
+DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "",
+  "Print a trace of Lisp function calls currently active.\n\
+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;
+
+  entering_debugger = 0;
+
+  XFASTINT (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);
+        }
+      else
+        {
+          tem = *backlist->function;
+          Fprin1 (tem, Qnil);   /* This can QUIT */
+          write_string ("(", -1);
+          if (backlist->nargs == MANY)
+            {
+              for (tail = *backlist->args, i = 0;
+                   !NULL (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, "",
+  "Return the function and arguments N frames up from current execution point.\n\
+If that frame has not evaluated the arguments yet (or is a special form),\n\
+the value is (nil FUNCTION ARG-FORMS...).\n\
+If that frame has evaluated its arguments and called its function already,\n\
+the value is (t FUNCTION ARG-VALUES...).\n\
+A &rest arg is represented as the tail of the list ARG-VALUES.\n\
+FUNCTION is whatever was supplied as car of evaluated list,\n\
+or a lambda expression for macro calls.\n\
+If N 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, 0);
+
+  /* Find the frame requested.  */
+  for (i = 0; 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));
+    }
+}
+
+syms_of_eval ()
+{
+  DEFVAR_INT ("max-specpdl-size", &max_specpdl_size,
+    "Limit on number of Lisp variable bindings & unwind-protects before error.");
+
+  DEFVAR_INT ("max-lisp-eval-depth", &max_lisp_eval_depth,
+    "Limit on depth in `eval', `apply' and `funcall' before error.\n\
+This limit is to catch infinite recursions for you before they cause\n\
+actual stack overflow in C, which would be fatal for Emacs.\n\
+You can safely make it considerably larger than its default value,\n\
+if that proves inconveniently small.");
+
+  DEFVAR_LISP ("quit-flag", &Vquit_flag,
+    "Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.\n\
+Typing C-G sets `quit-flag' non-nil, regardless of `inhibit-quit'.");
+  Vquit_flag = Qnil;
+
+  DEFVAR_LISP ("inhibit-quit", &Vinhibit_quit,
+    "Non-nil inhibits C-g quitting from happening immediately.\n\
+Note that `quit-flag' will still be set by typing C-g,\n\
+so a quit will be signalled as soon as `inhibit-quit' is nil.\n\
+To prevent this happening, set `quit-flag' to nil\n\
+before making `inhibit-quit' nil.");
+  Vinhibit_quit = Qnil;
+
+  Qautoload = intern ("autoload");
+  staticpro (&Qautoload);
+
+  Qdebug_on_error = intern ("debug-on-error");
+  staticpro (&Qdebug_on_error);
+
+  Qmacro = intern ("macro");
+  staticpro (&Qmacro);
+
+  /* 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);
+
+  Qand_rest = intern ("&rest");
+  staticpro (&Qand_rest);
+
+  Qand_optional = intern ("&optional");
+  staticpro (&Qand_optional);
+
+  DEFVAR_BOOL ("stack-trace-on-error", &stack_trace_on_error,
+    "*Non-nil means automatically display a backtrace buffer\n\
+after any error that is handled by the editor command loop.");
+  stack_trace_on_error = 0;
+
+  DEFVAR_BOOL ("debug-on-error", &debug_on_error,
+    "*Non-nil means enter debugger if an error is signaled.\n\
+Does not apply to errors handled by `condition-case'.\n\
+See also variable `debug-on-quit'.");
+  debug_on_error = 0;
+
+  DEFVAR_BOOL ("debug-on-quit", &debug_on_quit,
+    "*Non-nil means enter debugger if quit is signaled (C-G, for example).\n\
+Does not apply if quit is handled by a `condition-case'.");
+  debug_on_quit = 0;
+
+  DEFVAR_BOOL ("debug-on-next-call", &debug_on_next_call,
+    "Non-nil means enter debugger before next `eval', `apply' or `funcall'.");
+
+  DEFVAR_LISP ("debugger", &Vdebugger,
+    "Function to call to invoke debugger.\n\
+If due to frame exit, args are `exit' and the value being returned;\n\
+ this function's value will be returned instead of that.\n\
+If due to error, args are `error' and a list of the args to `signal'.\n\
+If due to `apply' or `funcall' entry, one arg, `lambda'.\n\
+If due to `eval' entry, one arg, t.");
+  Vdebugger = Qnil;
+
+  Qmocklisp_arguments = intern ("mocklisp-arguments");
+  staticpro (&Qmocklisp_arguments);
+  DEFVAR_LISP ("mocklisp-arguments", &Vmocklisp_arguments,
+    "While in a mocklisp function, the list of its unevaluated args.");
+  Vmocklisp_arguments = Qt;
+
+  DEFVAR_LISP ("run-hooks", &Vrun_hooks,
+    "Set to the function `run-hooks', if that function has been defined.\n\
+Otherwise, nil (in a bare Emacs without preloaded Lisp code).");
+  Vrun_hooks = Qnil;
+
+  staticpro (&Vautoload_queue);
+  Vautoload_queue = 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 (&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 (&Sbacktrace_debug);
+  defsubr (&Sbacktrace);
+  defsubr (&Sbacktrace_frame);
+}