+
−/* Fundamental definitions for XEmacs Lisp interpreter -- union objects.
+
−   Copyright (C) 1985, 1986, 1987, 1992, 1993, 1994
+
−   Free Software Foundation, Inc.
+
−   Copyright (C) 2002, 2005, 2010 Ben Wing.
+
−
+
−This file is part of XEmacs.
+
−
+
−XEmacs 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 3 of the License, or (at your
+
−option) any later version.
+
−
+
−XEmacs 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 XEmacs.  If not, see <http://www.gnu.org/licenses/>. */
+
−
+
−/* Divergent from FSF.  */
+
−
+
−/* Definition of Lisp_Object type as a union.
+
−   The declaration order of the objects within the struct members
+
−   of the union is dependent on ENDIAN-ness.
+
−   See lisp-disunion.h for more details.  */
+
−
+
−typedef
+
−union Lisp_Object
+
−{
+
−  /* if non-valbits are at lower addresses */
+
−#ifdef WORDS_BIGENDIAN
+
−  struct
+
−  {
+
−    EMACS_UINT val : VALBITS;
+
−    enum_field (Lisp_Type) type : GCTYPEBITS;
+
−  } gu;
+
−
+
−  struct
+
−  {
+
−    signed EMACS_INT val : FIXNUM_VALBITS;
+
−    unsigned int bits : FIXNUM_GCBITS;
+
−  } s;
+
−
+
−  struct
+
−  {
+
−    EMACS_UINT val : FIXNUM_VALBITS;
+
−    unsigned int bits : FIXNUM_GCBITS;
+
−  } u;
+
−#else /* non-valbits are at higher addresses */
+
−  struct
+
−  {
+
−    enum_field (Lisp_Type) type : GCTYPEBITS;
+
−    EMACS_UINT val : VALBITS;
+
−  } gu;
+
−
+
−  struct
+
−  {
+
−    unsigned int bits : FIXNUM_GCBITS;
+
−    signed EMACS_INT val : FIXNUM_VALBITS;
+
−  } s;
+
−
+
−  struct
+
−  {
+
−    unsigned int bits : FIXNUM_GCBITS;
+
−    EMACS_UINT val : FIXNUM_VALBITS;
+
−  } u;
+
−
+
−#endif /* non-valbits are at higher addresses */
+
−
+
−  EMACS_UINT ui;
+
−  signed EMACS_INT i;
+
−
+
−  /* This was formerly declared `void *v' etc. but that causes
+
−     GCC to accept any (yes, any) pointer as the argument of
+
−     a function declared to accept a Lisp_Object. */
+
−  struct nosuchstruct *v;
+
−}
+
−Lisp_Object;
+
−
+
−#define XCHARVAL(x) ((EMACS_INT)(x).gu.val)
+
−#define XPNTRVAL(x) ((x).ui)
+
−
+
−#define XREALFIXNUM(x) ((EMACS_INT)(x).s.val)
+
−#define XUINT(x) ((EMACS_UINT)(x).u.val)
+
−#define XTYPE(x) ((x).gu.type)
+
−#define EQ(x,y) ((x).v == (y).v)
+
−
+
−DECLARE_INLINE_HEADER (
+
−Lisp_Object
+
−make_fixnum_verify (EMACS_INT val)
+
−)
+
−{
+
−  Lisp_Object obj;
+
−  obj.s.bits = 1;
+
−  obj.s.val = val;
+
−  type_checking_assert (XREALFIXNUM (obj) == val);
+
−  return obj;
+
−}
+
−
+
−DECLARE_INLINE_HEADER (
+
−Lisp_Object
+
−make_fixnum (EMACS_INT val)
+
−)
+
−{
+
−  Lisp_Object obj;
+
−  obj.s.bits = 1;
+
−  obj.s.val = val;
+
−  return obj;
+
−}
+
−
+
−DECLARE_INLINE_HEADER (
+
−Lisp_Object
+
−make_char_1 (Ichar val)
+
−)
+
−{
+
−  Lisp_Object obj;
+
−  obj.gu.type = Lisp_Type_Char;
+
−  obj.gu.val = val;
+
−  return obj;
+
−}
+
−
+
−DECLARE_INLINE_HEADER (
+
−Lisp_Object
+
−wrap_pointer_1 (const void *ptr)
+
−)
+
−{
+
−  Lisp_Object obj;
+
−  obj.ui = (EMACS_UINT) ptr;
+
−  return obj;
+
−}
+
−
+
−extern MODULE_API Lisp_Object Qnull_pointer, Qzero;
+
−
+
−#define FIXNUMP(x) ((x).s.bits)
+
−#define FIXNUM_PLUS(x,y)  make_fixnum (XFIXNUM (x) + XFIXNUM (y))
+
−#define FIXNUM_MINUS(x,y) make_fixnum (XFIXNUM (x) - XFIXNUM (y))
+
−#define FIXNUM_PLUS1(x)   make_fixnum (XFIXNUM (x) + 1)
+
−#define FIXNUM_MINUS1(x)  make_fixnum (XFIXNUM (x) - 1)
+
−
+
−/* WARNING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
−
+
−   You can only GET_LISP_FROM_VOID something that had previously been
+
−   STORE_LISP_IN_VOID'd.  If you want to go the other way, use
+
−   STORE_VOID_IN_LISP and GET_VOID_FROM_LISP, or use make_opaque_ptr(). */
+
−
+
−/* Convert a Lisp object to a void * pointer, as when it needs to be passed
+
−   to a toolkit callback function */
+
−#define STORE_LISP_IN_VOID(larg) ((void *) ((larg).v))
+
−
+
−/* Convert a void * pointer back into a Lisp object, assuming that the
+
−   pointer was generated by STORE_LISP_IN_VOID. */
+
−DECLARE_INLINE_HEADER (
+
−Lisp_Object
+
−GET_LISP_FROM_VOID (const void *arg)
+
−)
+
−{
+
−  Lisp_Object larg;
+
−  larg.v = (struct nosuchstruct *) arg;
+
−  return larg;
+
−}
+
−
+
−/* Convert a Lisp_Object into something that can't be used as an
+
−   lvalue.  Useful for type-checking. */
+
−#if (__GNUC__ > 1)
+
−#define NON_LVALUE(larg) ({ (larg); })
+
−#else
+
−/* Well, you can't really do it without using a function call, and
+
−   there's no real point in that; no-union-type is the rule, and that
+
−   will catch errors. */
+
−#define NON_LVALUE(larg) (larg)
+
−#endif