data.c

早期freebsd实现

/* Primitive operations on Lisp data types for GNU Emacs Lisp interpreter.
   Copyright (C) 1985, 1986 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 <signal.h>

#include "config.h"
#include "lisp.h"

#ifndef standalone
#include "buffer.h"
#endif

Lisp_Object Qnil, Qt, Qquote, Qlambda, Qsubr, Qunbound;
Lisp_Object Qerror_conditions, Qerror_message, Qtop_level;
Lisp_Object Qerror, Qquit, Qwrong_type_argument, Qargs_out_of_range;
Lisp_Object Qvoid_variable, Qvoid_function;
Lisp_Object Qsetting_constant, Qinvalid_read_syntax;
Lisp_Object Qinvalid_function, Qwrong_number_of_arguments, Qno_catch;
Lisp_Object Qend_of_file, Qarith_error;
Lisp_Object Qbeginning_of_buffer, Qend_of_buffer, Qbuffer_read_only;
Lisp_Object Qintegerp, Qnatnump, Qsymbolp, Qlistp, Qconsp;
Lisp_Object Qstringp, Qarrayp, Qsequencep, Qbufferp;
Lisp_Object Qchar_or_string_p, Qmarkerp, Qinteger_or_marker_p, Qvectorp;
Lisp_Object Qboundp, Qfboundp;
Lisp_Object Qcdr;

Lisp_Object
wrong_type_argument (predicate, value)
     register Lisp_Object predicate, value;
{
  register Lisp_Object tem;
  do
    {
      if (!EQ (Vmocklisp_arguments, Qt))
	{
	 if (XTYPE (value) == Lisp_String &&
	     (EQ (predicate, Qintegerp) || EQ (predicate, Qinteger_or_marker_p)))
	   return Fstring_to_int (value, Qt);
	 if (XTYPE (value) == Lisp_Int && EQ (predicate, Qstringp))
	   return Fint_to_string (value);
	}
      value = Fsignal (Qwrong_type_argument, Fcons (predicate, Fcons (value, Qnil)));
      tem = call1 (predicate, value);
    }
  while (NULL (tem));
  return value;
}

pure_write_error ()
{
  error ("Attempt to modify read-only object");
}

void
args_out_of_range (a1, a2)
     Lisp_Object a1, a2;
{
  while (1)
    Fsignal (Qargs_out_of_range, Fcons (a1, Fcons (a2, Qnil)));
}

void
args_out_of_range_3 (a1, a2, a3)
     Lisp_Object a1, a2, a3;
{
  while (1)
    Fsignal (Qargs_out_of_range, Fcons (a1, Fcons (a2, Fcons (a3, Qnil))));
}

Lisp_Object
make_number (num)
     int num;
{
  register Lisp_Object val;
  XSET (val, Lisp_Int, num);
  return val;
}

/* On some machines, XINT needs a temporary location.
   Here it is, in case it is needed.  */

int sign_extend_temp;

/* On a few machines, XINT can only be done by calling this.  */

int
sign_extend_lisp_int (num)
     int num;
{
  if (num & (1 << (VALBITS - 1)))
    return num | ((-1) << VALBITS);
  else
    return num & ((1 << VALBITS) - 1);
}

/* Data type predicates */

DEFUN ("eq", Feq, Seq, 2, 2, 0,
  "T if the two args are the same Lisp object.")
  (obj1, obj2)
     Lisp_Object obj1, obj2;
{
  if (EQ (obj1, obj2))
    return Qt;
  return Qnil;
}

DEFUN ("null", Fnull, Snull, 1, 1, 0, "T if OBJECT is nil.")
  (obj)
     Lisp_Object obj;
{
  if (NULL (obj))
    return Qt;
  return Qnil;
}

DEFUN ("consp", Fconsp, Sconsp, 1, 1, 0, "T if OBJECT is a cons cell.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Cons)
    return Qt;
  return Qnil;
}

DEFUN ("atom", Fatom, Satom, 1, 1, 0, "T if OBJECT is not a cons cell.  This includes nil.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Cons)
    return Qnil;
  return Qt;
}

DEFUN ("listp", Flistp, Slistp, 1, 1, 0, "T if OBJECT is a list.  This includes nil.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Cons || NULL (obj))
    return Qt;
  return Qnil;
}

DEFUN ("nlistp", Fnlistp, Snlistp, 1, 1, 0, "T if OBJECT is not a list.  Lists include nil.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Cons || NULL (obj))
    return Qnil;
  return Qt;
}

DEFUN ("integerp", Fintegerp, Sintegerp, 1, 1, 0, "T if OBJECT is a number.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Int)
    return Qt;
  return Qnil;
}

DEFUN ("natnump", Fnatnump, Snatnump, 1, 1, 0, "T if OBJECT is a nonnegative number.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Int && XINT (obj) >= 0)
    return Qt;
  return Qnil;
}

DEFUN ("symbolp", Fsymbolp, Ssymbolp, 1, 1, 0, "T if OBJECT is a symbol.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Symbol)
    return Qt;
  return Qnil;
}

DEFUN ("vectorp", Fvectorp, Svectorp, 1, 1, 0, "T if OBJECT is a vector.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Vector)
    return Qt;
  return Qnil;
}

DEFUN ("stringp", Fstringp, Sstringp, 1, 1, 0, "T if OBJECT is a string.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_String)
    return Qt;
  return Qnil;
}

DEFUN ("arrayp", Farrayp, Sarrayp, 1, 1, 0, "T if OBJECT is an array (string or vector).")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Vector || XTYPE (obj) == Lisp_String)
    return Qt;
  return Qnil;
}

DEFUN ("sequencep", Fsequencep, Ssequencep, 1, 1, 0,
  "T if OBJECT is a sequence (list or array).")
  (obj)
     register Lisp_Object obj;
{
  if (CONSP (obj) || NULL (obj) ||
      XTYPE (obj) == Lisp_Vector || XTYPE (obj) == Lisp_String)
    return Qt;
  return Qnil;
}

DEFUN ("bufferp", Fbufferp, Sbufferp, 1, 1, 0, "T if OBJECT is an editor buffer.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Buffer)
    return Qt;
  return Qnil;
}

DEFUN ("markerp", Fmarkerp, Smarkerp, 1, 1, 0, "T if OBJECT is a marker (editor pointer).")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Marker)
    return Qt;
  return Qnil;
}

DEFUN ("integer-or-marker-p", Finteger_or_marker_p, Sinteger_or_marker_p, 1, 1, 0,
  "T if OBJECT is an integer or a marker (editor pointer).")
  (obj)
     register Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Marker || XTYPE (obj) == Lisp_Int)
    return Qt;
  return Qnil;
}

DEFUN ("subrp", Fsubrp, Ssubrp, 1, 1, 0, "T if OBJECT is a built-in function.")
  (obj)
     Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Subr)
    return Qt;
  return Qnil;
}

DEFUN ("char-or-string-p", Fchar_or_string_p, Schar_or_string_p, 1, 1, 0, "T if OBJECT is a character (a number) or a string.")
  (obj)
     register Lisp_Object obj;
{
  if (XTYPE (obj) == Lisp_Int || XTYPE (obj) == Lisp_String)
    return Qt;
  return Qnil;
}

/* Extract and set components of lists */

DEFUN ("car", Fcar, Scar, 1, 1, 0,
  "Return the car of CONSCELL.  If arg is nil, return nil.")
  (list)
     register Lisp_Object list;
{
  while (1)
    {
      if (XTYPE (list) == Lisp_Cons)
	return XCONS (list)->car;
      else if (EQ (list, Qnil))
	return Qnil;
      else
	list = wrong_type_argument (Qlistp, list);
    }
}

DEFUN ("car-safe", Fcar_safe, Scar_safe, 1, 1, 0,
  "Return the car of OBJECT if it is a cons cell, or else  nil.")
  (object)
     Lisp_Object object;
{
  if (XTYPE (object) == Lisp_Cons)
    return XCONS (object)->car;
  else
    return Qnil;
}

DEFUN ("cdr", Fcdr, Scdr, 1, 1, 0,
  "Return the cdr of CONSCELL.  If arg is nil, return nil.")
  (list)
     register Lisp_Object list;
{
  while (1)
    {
      if (XTYPE (list) == Lisp_Cons)
	return XCONS (list)->cdr;
      else if (EQ (list, Qnil))
	return Qnil;
      else
	list = wrong_type_argument (Qlistp, list);
    }
}

DEFUN ("cdr-safe", Fcdr_safe, Scdr_safe, 1, 1, 0,
  "Return the cdr of OBJECT if it is a cons cell, or else  nil.")
  (object)
     Lisp_Object object;
{
  if (XTYPE (object) == Lisp_Cons)
    return XCONS (object)->cdr;
  else
    return Qnil;
}

DEFUN ("setcar", Fsetcar, Ssetcar, 2, 2, 0,
  "Set the car of CONSCELL to be NEWCAR.  Returns NEWCAR.")
  (cell, newcar)
     register Lisp_Object cell, newcar;
{
  if (XTYPE (cell) != Lisp_Cons)
    cell = wrong_type_argument (Qconsp, cell);

  CHECK_IMPURE (cell);
  XCONS (cell)->car = newcar;
  return newcar;
}

DEFUN ("setcdr", Fsetcdr, Ssetcdr, 2, 2, 0,
  "Set the cdr of CONSCELL to be NEWCDR.  Returns NEWCDR.")
  (cell, newcdr)
     register Lisp_Object cell, newcdr;
{
  if (XTYPE (cell) != Lisp_Cons)
    cell = wrong_type_argument (Qconsp, cell);

  CHECK_IMPURE (cell);
  XCONS (cell)->cdr = newcdr;
  return newcdr;
}

/* Extract and set components of symbols */

DEFUN ("boundp", Fboundp, Sboundp, 1, 1, 0, "T if SYMBOL's value is not void.")
  (sym)
     register Lisp_Object sym;
{
  CHECK_SYMBOL (sym, 0);
  return (XTYPE (XSYMBOL (sym)->value) == Lisp_Void
	  || EQ (XSYMBOL (sym)->value, Qunbound))
	 ? Qnil : Qt;
}

DEFUN ("fboundp", Ffboundp, Sfboundp, 1, 1, 0, "T if SYMBOL's function definition is not void.")
  (sym)
     register Lisp_Object sym;
{
  CHECK_SYMBOL (sym, 0);
  return (XTYPE (XSYMBOL (sym)->function) == Lisp_Void
	  || EQ (XSYMBOL (sym)->function, Qunbound))
	 ? Qnil : Qt;
}

DEFUN ("makunbound", Fmakunbound, Smakunbound, 1, 1, 0, "Make SYMBOL's value be void.")
  (sym)
     register Lisp_Object sym;
{
  CHECK_SYMBOL (sym, 0);
  XSYMBOL (sym)->value = Qunbound;
  return sym;
}

DEFUN ("fmakunbound", Ffmakunbound, Sfmakunbound, 1, 1, 0, "Make SYMBOL's function definition be void.")
  (sym)
     register Lisp_Object sym;
{
  CHECK_SYMBOL (sym, 0);
  XSYMBOL (sym)->function = Qunbound;
  return sym;
}

DEFUN ("symbol-function", Fsymbol_function, Ssymbol_function, 1, 1, 0,
  "Return SYMBOL's function definition.")
  (sym)
     register Lisp_Object sym;
{
  CHECK_SYMBOL (sym, 0);
  if (EQ (XSYMBOL (sym)->function, Qunbound))
    return Fsignal (Qvoid_function, Fcons (sym, Qnil));
  return XSYMBOL (sym)->function;
}

DEFUN ("symbol-plist", Fsymbol_plist, Ssymbol_plist, 1, 1, 0, "Return SYMBOL's property list.")
  (sym)
     register Lisp_Object sym;
{
  CHECK_SYMBOL (sym, 0);
  return XSYMBOL (sym)->plist;
}

DEFUN ("symbol-name", Fsymbol_name, Ssymbol_name, 1, 1, 0, "Return SYMBOL's name, a string.")
  (sym)
     register Lisp_Object sym;
{
  register Lisp_Object name;

  CHECK_SYMBOL (sym, 0);
  XSET (name, Lisp_String, XSYMBOL (sym)->name);
  return name;
}

DEFUN ("fset", Ffset, Sfset, 2, 2, 0,
  "Set SYMBOL's function definition to NEWVAL, and return NEWVAL.")
  (sym, newdef)
     register Lisp_Object sym, newdef;
{
  CHECK_SYMBOL (sym, 0);
  if (!NULL (Vautoload_queue) && !EQ (XSYMBOL (sym)->function, Qunbound))
    Vautoload_queue = Fcons (Fcons (sym, XSYMBOL (sym)->function),
			     Vautoload_queue);
  XSYMBOL (sym)->function = newdef;
  return newdef;
}

DEFUN ("setplist", Fsetplist, Ssetplist, 2, 2, 0,
  "Set SYMBOL's property list to NEWVAL, and return NEWVAL.")
  (sym, newplist)
     register Lisp_Object sym, newplist;
{
  CHECK_SYMBOL (sym, 0);
  XSYMBOL (sym)->plist = newplist;
  return newplist;
}

/* Getting and setting values of symbols */

/* Given the raw contents of a symbol value cell,
 return the Lisp value of the symbol. */

Lisp_Object
do_symval_forwarding (valcontents)
     register Lisp_Object valcontents;
{
  register Lisp_Object val;
#ifdef SWITCH_ENUM_BUG
  switch ((int) XTYPE (valcontents))
#else
  switch (XTYPE (valcontents))
#endif
    {
    case Lisp_Intfwd:
      XSET (val, Lisp_Int, *XINTPTR (valcontents));
      return val;

    case Lisp_Boolfwd:
      if (*XINTPTR (valcontents))
	return Qt;
      return Qnil;

    case Lisp_Objfwd:
      return *XOBJFWD (valcontents);

    case Lisp_Buffer_Objfwd:
      return *(Lisp_Object *)(XUINT (valcontents) + (char *)current_buffer);
    }
  return valcontents;
}

void
store_symval_forwarding (sym, valcontents, newval)
     Lisp_Object sym;
     register Lisp_Object valcontents, newval;
{
#ifdef SWITCH_ENUM_BUG
  switch ((int) XTYPE (valcontents))
#else
  switch (XTYPE (valcontents))
#endif
    {
    case Lisp_Intfwd:
      CHECK_NUMBER (newval, 1);
      *XINTPTR (valcontents) = XINT (newval);
      break;

    case Lisp_Boolfwd:
      *XINTPTR (valcontents) = NULL(newval) ? 0 : 1;
      break;

    case Lisp_Objfwd:
      *XOBJFWD (valcontents) = newval;
      break;

    case Lisp_Buffer_Objfwd:
      *(Lisp_Object *)(XUINT (valcontents) + (char *)current_buffer) = newval;
      break;

    default:
      valcontents = XSYMBOL (sym)->value;
      if (XTYPE (valcontents) == Lisp_Buffer_Local_Value ||
	  XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
	XCONS (XSYMBOL (sym)->value)->car = newval;
      else
	XSYMBOL (sym)->value = newval;
    }
}

/* Note that it must not be possible to quit within this function.
   Great care is required for this.  */