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/* Fundamental definitions for GNU Emacs Lisp interpreter.
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   Copyright (C) 1985,86,87,93,94,95 Free Software Foundation, Inc.
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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
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the Free Software Foundation; either version 2, or (at your option)
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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.  */


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/* These are default choices for the types to use.  */
#ifndef EMACS_INT
#define EMACS_INT int
#endif
#ifndef EMACS_UINT
#define EMACS_UINT unsigned int
#endif

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/* Define the fundamental Lisp data structures.  */
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/* This is the set of Lisp data types.  */
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enum Lisp_Type
  {
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    /* Integer.  XINT (obj) is the integer value.  */
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    Lisp_Int,

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    /* Symbol.  XSYMBOL (object) points to a struct Lisp_Symbol.  */
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    Lisp_Symbol,

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    /* Miscellaneous.  XMISC (object) points to a union Lisp_Misc,
       whose first member indicates the subtype.  */
    Lisp_Misc,
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    /* String.  XSTRING (object) points to a struct Lisp_String.
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       The length of the string, and its contents, are stored therein.  */
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    Lisp_String,

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    /* Vector of Lisp objects, or something resembling it.
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       XVECTOR (object) points to a struct Lisp_Vector, which contains
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       the size and contents.  The size field also contains the type
       information, if it's not a real vector object.  */
    Lisp_Vectorlike,
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    /* Cons.  XCONS (object) points to a struct Lisp_Cons.  */
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    Lisp_Cons,

#ifdef LISP_FLOAT_TYPE
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    Lisp_Float,
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#endif /* LISP_FLOAT_TYPE */
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    /* This is not a type code.  It is for range checking.  */
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    Lisp_Type_Limit
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  };

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/* This is the set of datatypes that share a common structure.
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   The first member of the structure is a type code from this set.
   The enum values are arbitrary, but we'll use large numbers to make it
   more likely that we'll spot the error if a random word in memory is
   mistakenly interpreted as a Lisp_Misc.  */
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enum Lisp_Misc_Type
  {
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    Lisp_Misc_Free = 0x5eab,
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    Lisp_Misc_Marker,
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    Lisp_Misc_Intfwd,
    Lisp_Misc_Boolfwd,
    Lisp_Misc_Objfwd,
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    Lisp_Misc_Buffer_Objfwd,
    Lisp_Misc_Buffer_Local_Value,
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    Lisp_Misc_Some_Buffer_Local_Value,
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    Lisp_Misc_Overlay,
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    Lisp_Misc_Display_Objfwd,
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    /* Currently floats are not a misc type,
       but let's define this in case we want to change that.  */
    Lisp_Misc_Float,
    /* This is not a type code.  It is for range checking.  */
    Lisp_Misc_Limit
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  };

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/* These values are overridden by the m- file on some machines.  */
#ifndef VALBITS
#define VALBITS 28
#endif

#ifndef GCTYPEBITS
#define GCTYPEBITS 3
#endif

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#ifndef NO_UNION_TYPE

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#ifndef WORDS_BIG_ENDIAN
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/* Definition of Lisp_Object for little-endian machines.  */

typedef
union Lisp_Object
  {
    /* Used for comparing two Lisp_Objects;
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       also, positive integers can be accessed fast this way.  */
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    int i;

    struct
      {
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	int val: VALBITS;
	int type: GCTYPEBITS+1;
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      } s;
    struct
      {
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	unsigned int val: VALBITS;
	int type: GCTYPEBITS+1;
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      } u;
    struct
      {
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	unsigned int val: VALBITS;
	enum Lisp_Type type: GCTYPEBITS;
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	/* The markbit is not really part of the value of a Lisp_Object,
	   and is always zero except during garbage collection.  */
	unsigned int markbit: 1;
      } gu;
  }
Lisp_Object;

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#else /* If WORDS_BIG_ENDIAN */
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typedef
union Lisp_Object
  {
    /* Used for comparing two Lisp_Objects;
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       also, positive integers can be accessed fast this way.  */
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    int i;

    struct
      {
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	int type: GCTYPEBITS+1;
	int val: VALBITS;
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      } s;
    struct
      {
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	int type: GCTYPEBITS+1;
	unsigned int val: VALBITS;
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      } u;
    struct
      {
	/* The markbit is not really part of the value of a Lisp_Object,
	   and is always zero except during garbage collection.  */
	unsigned int markbit: 1;
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	enum Lisp_Type type: GCTYPEBITS;
	unsigned int val: VALBITS;
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      } gu;
  }
Lisp_Object;

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#endif /* WORDS_BIG_ENDIAN */
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#endif /* NO_UNION_TYPE */


/* If union type is not wanted, define Lisp_Object as just a number
   and define the macros below to extract fields by shifting */

#ifdef NO_UNION_TYPE

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#define Lisp_Object EMACS_INT
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#ifndef VALMASK
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#define VALMASK ((((EMACS_INT) 1)<<VALBITS) - 1)
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#endif
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#define GCTYPEMASK ((((EMACS_INT) 1)<<GCTYPEBITS) - 1)
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/* Two flags that are set during GC.  On some machines, these flags
   are defined differently by the m- file.  */

/* This is set in the car of a cons and in the plist slot of a symbol
   to indicate it is marked.  Likewise in the plist slot of an interval,
   the chain slot of a marker, the type slot of a float, and the name
   slot of a buffer.

   In strings, this bit in the size field indicates that the string
   is a "large" one, one which was separately malloc'd
   rather than being part of a string block.  */

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#ifndef MARKBIT
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#define MARKBIT (1 << (VALBITS + GCTYPEBITS))
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#endif /*MARKBIT */
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/* In the size word of a vector, this bit means the vector has been marked.
   In the size word of a large string, likewise.  */

#ifndef ARRAY_MARK_FLAG
#define ARRAY_MARK_FLAG ((MARKBIT >> 1) & ~MARKBIT)
#endif /* no ARRAY_MARK_FLAG */

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/* In the size word of a struct Lisp_Vector, this bit means it's really
   some other vector-like object.  */
#ifndef PSEUDOVECTOR_FLAG
#define PSEUDOVECTOR_FLAG ((ARRAY_MARK_FLAG >> 1) & ~ARRAY_MARK_FLAG)
#endif

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/* In a pseudovector, the size field actually contains a word with one
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   PSEUDOVECTOR_FLAG bit set, and exactly one of the following bits to
   indicate the actual type.  */
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enum pvec_type
{
  PVEC_NORMAL_VECTOR = 0,
  PVEC_BUFFER = 0x100,
  PVEC_PROCESS = 0x200,
  PVEC_FRAME = 0x400,
  PVEC_COMPILED = 0x800,
  PVEC_WINDOW = 0x1000,
  PVEC_WINDOW_CONFIGURATION = 0x2000,
  PVEC_SUBR = 0x4000,
  PVEC_TYPE_MASK = 0x7f00,
  PVEC_FLAG = PSEUDOVECTOR_FLAG,
};
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/* For convenience, we also store the number of elements in these bits.  */
#define PSEUDOVECTOR_SIZE_MASK 0xff

#if ARRAY_MARK_FLAG == MARKBIT || PSEUDOVECTOR_FLAG == ARRAY_MARK_FLAG || PSEUDOVECTOR_FLAG == MARKBIT
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you lose
#endif

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#endif /* NO_UNION_TYPE */

/* These macros extract various sorts of values from a Lisp_Object.
 For example, if tem is a Lisp_Object whose type is Lisp_Cons,
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 XCONS (tem) is the struct Lisp_Cons * pointing to the memory for that cons.  */
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#ifdef NO_UNION_TYPE

/* One need to override this if there must be high bits set in data space
   (doing the result of the below & ((1 << (GCTYPE + 1)) - 1) would work
    on all machines, but would penalise machines which don't need it)
 */
#ifndef XTYPE
#define XTYPE(a) ((enum Lisp_Type) ((a) >> VALBITS))
#endif

#ifndef XSETTYPE
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#define XSETTYPE(a, b) ((a)  =  XUINT (a) | ((EMACS_INT)(b) << VALBITS))
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#endif

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/* For integers known to be positive, XFASTINT provides fast retrieval
   and XSETFASTINT provides fast storage.  This takes advantage of the
   fact that Lisp_Int is 0.  */
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#define XFASTINT(a) ((a) + 0)
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#define XSETFASTINT(a, b) ((a) = (b))
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/* Extract the value of a Lisp_Object as a signed integer.  */

#ifndef XINT   /* Some machines need to do this differently.  */
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#define XINT(a) (((a) << (INTBITS-VALBITS)) >> (INTBITS-VALBITS))
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#endif

/* Extract the value as an unsigned integer.  This is a basis
   for extracting it as a pointer to a structure in storage.  */

#ifndef XUINT
#define XUINT(a) ((a) & VALMASK)
#endif

#ifndef XPNTR
#ifdef HAVE_SHM
/* In this representation, data is found in two widely separated segments.  */
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extern int pure_size;
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#define XPNTR(a) \
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  (XUINT (a) | (XUINT (a) > pure_size ? DATA_SEG_BITS : PURE_SEG_BITS))
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#else /* not HAVE_SHM */
#ifdef DATA_SEG_BITS
/* This case is used for the rt-pc.
   In the diffs I was given, it checked for ptr = 0
   and did not adjust it in that case.
   But I don't think that zero should ever be found
   in a Lisp object whose data type says it points to something.  */
#define XPNTR(a) (XUINT (a) | DATA_SEG_BITS)
#else
#define XPNTR(a) XUINT (a)
#endif
#endif /* not HAVE_SHM */
#endif /* no XPNTR */

#ifndef XSET
#define XSET(var, type, ptr) \
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   ((var) = ((EMACS_INT)(type) << VALBITS) + ((EMACS_INT) (ptr) & VALMASK))
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#endif

/* During garbage collection, XGCTYPE must be used for extracting types
 so that the mark bit is ignored.  XMARKBIT accesses the markbit.
 Markbits are used only in particular slots of particular structure types.
 Other markbits are always zero.
 Outside of garbage collection, all mark bits are always zero.  */

#ifndef XGCTYPE
#define XGCTYPE(a) ((enum Lisp_Type) (((a) >> VALBITS) & GCTYPEMASK))
#endif

#if VALBITS + GCTYPEBITS == INTBITS - 1
/* Make XMARKBIT faster if mark bit is sign bit.  */
#ifndef XMARKBIT
#define XMARKBIT(a) ((a) < 0)
#endif
#endif /* markbit is sign bit */

#ifndef XMARKBIT
#define XMARKBIT(a) ((a) & MARKBIT)
#endif

#ifndef XSETMARKBIT
#define XSETMARKBIT(a,b) ((a) = ((a) & ~MARKBIT) | ((b) ? MARKBIT : 0))
#endif

#ifndef XMARK
#define XMARK(a) ((a) |= MARKBIT)
#endif

#ifndef XUNMARK
#define XUNMARK(a) ((a) &= ~MARKBIT)
#endif

#endif /* NO_UNION_TYPE */

#ifndef NO_UNION_TYPE

#define XTYPE(a) ((enum Lisp_Type) (a).u.type)
#define XSETTYPE(a, b) ((a).u.type = (char) (b))

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/* For integers known to be positive, XFASTINT provides fast retrieval
   and XSETFASTINT provides fast storage.  This takes advantage of the
   fact that Lisp_Int is 0.  */
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#define XFASTINT(a) ((a).i + 0)
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#define XSETFASTINT(a, b) ((a).i = (b))
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#ifdef EXPLICIT_SIGN_EXTEND
/* Make sure we sign-extend; compilers have been known to fail to do so.  */
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#define XINT(a) (((a).i << (INTBITS-VALBITS)) >> (INTBITS-VALBITS))
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#else
#define XINT(a) ((a).s.val)
#endif /* EXPLICIT_SIGN_EXTEND */

#define XUINT(a) ((a).u.val)
#define XPNTR(a) ((a).u.val)

#define XSET(var, vartype, ptr) \
   (((var).s.type = ((char) (vartype))), ((var).s.val = ((int) (ptr))))

/* During garbage collection, XGCTYPE must be used for extracting types
 so that the mark bit is ignored.  XMARKBIT access the markbit.
 Markbits are used only in particular slots of particular structure types.
 Other markbits are always zero.
 Outside of garbage collection, all mark bits are always zero.  */

#define XGCTYPE(a) ((a).gu.type)
#define XMARKBIT(a) ((a).gu.markbit)
#define XSETMARKBIT(a,b) (XMARKBIT(a) = (b))
#define XMARK(a) (XMARKBIT(a) = 1)
#define XUNMARK(a) (XMARKBIT(a) = 0)

#endif /* NO_UNION_TYPE */

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/* Extract a value or address from a Lisp_Object.  */
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#define XCONS(a) ((struct Lisp_Cons *) XPNTR(a))
#define XVECTOR(a) ((struct Lisp_Vector *) XPNTR(a))
#define XSTRING(a) ((struct Lisp_String *) XPNTR(a))
#define XSYMBOL(a) ((struct Lisp_Symbol *) XPNTR(a))
#define XFLOAT(a) ((struct Lisp_Float *) XPNTR(a))
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/* Misc types.  */
#define XMISC(a)   ((union Lisp_Misc *) XPNTR(a))
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#define XMARKER(a) (&(XMISC(a)->u_marker))
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#define XINTFWD(a) (&(XMISC(a)->u_intfwd))
#define XBOOLFWD(a) (&(XMISC(a)->u_boolfwd))
#define XOBJFWD(a) (&(XMISC(a)->u_objfwd))
#define XBUFFER_OBJFWD(a) (&(XMISC(a)->u_buffer_objfwd))
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#define XBUFFER_LOCAL_VALUE(a) (&(XMISC(a)->u_buffer_local_value))
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#define XOVERLAY(a) (&(XMISC(a)->u_overlay))
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#define XDISPLAY_OBJFWD(a) (&(XMISC(a)->u_display_objfwd))
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/* Pseudovector types.  */
#define XPROCESS(a) ((struct Lisp_Process *) XPNTR(a))
#define XWINDOW(a) ((struct window *) XPNTR(a))
#define XSUBR(a) ((struct Lisp_Subr *) XPNTR(a))
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#define XBUFFER(a) ((struct buffer *) XPNTR(a))


/* Construct a Lisp_Object from a value or address.  */
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#define XSETINT(a, b) XSET (a, Lisp_Int, b)
#define XSETCONS(a, b) XSET (a, Lisp_Cons, b)
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#define XSETVECTOR(a, b) XSET (a, Lisp_Vectorlike, b)
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#define XSETSTRING(a, b) XSET (a, Lisp_String, b)
#define XSETSYMBOL(a, b) XSET (a, Lisp_Symbol, b)
#define XSETFLOAT(a, b) XSET (a, Lisp_Float, b)
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/* Misc types.  */
#define XSETMISC(a, b) XSET (a, Lisp_Misc, b)
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#define XSETMARKER(a, b) (XSETMISC (a, b), XMISC (a)->type = Lisp_Misc_Marker)
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/* Pseudovector types.  */
#define XSETPSEUDOVECTOR(a, b, code) \
  (XSETVECTOR (a, b), XVECTOR (a)->size |= PSEUDOVECTOR_FLAG | (code))
#define XSETWINDOW_CONFIGURATION(a, b) \
  (XSETPSEUDOVECTOR (a, b, PVEC_WINDOW_CONFIGURATION))
#define XSETPROCESS(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_PROCESS))
#define XSETWINDOW(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_WINDOW))
#define XSETSUBR(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_SUBR))
#define XSETCOMPILED(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_COMPILED))
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#define XSETBUFFER(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_BUFFER))
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#ifdef USE_TEXT_PROPERTIES
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/* Basic data type for use of intervals.  See the macros in intervals.h.  */
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struct interval
{
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  /* The first group of entries deal with the tree structure.  */
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  unsigned int total_length;	/* Length of myself and both children.  */
  unsigned int position;	/* Cache of interval's character position.  */
  struct interval *left;	/* Intervals which precede me.  */
  struct interval *right;	/* Intervals which succeed me.  */
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  /* Parent in the tree, or the Lisp_Object containing this interval tree.

     The mark bit on the root interval of an interval tree says
     whether we have started (and possibly finished) marking the
     tree.  If GC comes across an interval tree whose root's parent
     field has its markbit set, it leaves the tree alone.

     You'd think we could store this information in the parent object
     somewhere (after all, that should be visited once and then
     ignored too, right?), but strings are GC'd strangely.  */
  struct interval *parent;
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  /* The remaining components are `properties' of the interval.
     The first four are duplicates for things which can be on the list,
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     for purposes of speed.  */
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  unsigned char write_protect;	    /* Non-zero means can't modify.  */
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  unsigned char visible;	    /* Zero means don't display.  */
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  unsigned char front_sticky;	    /* Non-zero means text inserted just
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				       before this interval goes into it.  */
  unsigned char rear_sticky;	    /* Likewise for just after it.  */
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  /* Properties of this interval.
     The mark bit on this field says whether this particular interval
     tree node has been visited.  Since intervals should never be
     shared, GC aborts if it seems to have visited an interval twice.  */
  Lisp_Object plist;
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};

typedef struct interval *INTERVAL;

/* Complain if object is not string or buffer type */
#define CHECK_STRING_OR_BUFFER(x, i) \
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  { if (!STRINGP ((x)) && !BUFFERP ((x))) \
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      x = wrong_type_argument (Qbuffer_or_string_p, (x)); }

/* Macro used to conditionally compile intervals into certain data
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   structures.  See, e.g., struct Lisp_String below.  */
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#define DECLARE_INTERVALS INTERVAL intervals;

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/* Macro used to conditionally compile interval initialization into
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   certain code.  See, e.g., alloc.c.  */
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#define INITIALIZE_INTERVAL(ptr,val) ptr->intervals = val

#else  /* No text properties */

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/* If no intervals are used, make the above definitions go away.  */
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#define CHECK_STRING_OR_BUFFER(x, i)

#define INTERVAL
#define DECLARE_INTERVALS
#define INITIALIZE_INTERVAL(ptr,val)

#endif /* USE_TEXT_PROPERTIES */

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#define ECHOBUFSIZE 300
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/* All of the per-display objects, packaged together in a struct.  */
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typedef struct PERDISPLAY PERDISPLAY;
struct PERDISPLAY
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  {
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    PERDISPLAY *next_perdisplay;
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    /* The state of a prefix arg.  */
    Lisp_Object prefix_factor, prefix_value;
    int prefix_sign, prefix_partial;
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    /* Unread events specific to this display.  */
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    Lisp_Object kbd_queue;

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    /* Non-nil while a kbd macro is being defined.  */
    Lisp_Object defining_kbd_macro;

    /* The start of storage for the current keyboard macro.  */
    Lisp_Object *kbd_macro_buffer;

    /* Where to store the next keystroke of the macro.  */
    Lisp_Object *kbd_macro_ptr;
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    /* The finalized section of the macro starts at kbd_macro_buffer and
       ends before this.  This is not the same as kbd_macro_ptr, because
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       we advance this to kbd_macro_ptr when a key's command is complete.
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       This way, the keystrokes for "end-kbd-macro" are not included in the
       macro.  */
    Lisp_Object *kbd_macro_end;
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    /* Allocated size of kbd_macro_buffer.  */
    int kbd_macro_bufsize;

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    /* Last anonymous kbd macro defined.  */
    Lisp_Object Vlast_kbd_macro;

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    /* Placeholder for future vars that will be moved here.  */
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    Lisp_Object unused[19];
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    /* Nonzero means echo each character as typed.  */
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    int immediate_echo;
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    /* If we have echoed a prompt string specified by the user,
       this is its length.  Otherwise this is -1.  */
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    int echo_after_prompt;
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    /* Where to append more text to echobuf if we want to.  */
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    char *echoptr;
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    /* The text we're echoing in the modeline - partial key sequences,
       usually.  '\0'-terminated.  This really shouldn't have a fixed size.  */
    char echobuf[ECHOBUFSIZE];
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  };

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#ifdef MULTI_PERDISPLAY
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/* The perdisplay object associated with a particular frame.  */
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extern PERDISPLAY *get_perdisplay ();
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/* The perdisplay object associated with the command currently being read
   or executed.  */
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extern PERDISPLAY *current_perdisplay;
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/* A list of all perdisplay objects, linked through next_perdisplay.  */
extern PERDISPLAY *all_perdisplays;
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/* Nonzero if current_perdisplay has exclusive use of the keyboard.
   Usually this means that a command is being executed.  */
extern int display_locked;
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#else
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extern PERDISPLAY the_only_perdisplay;
#define get_perdisplay(f) (&the_only_perdisplay)
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#define current_perdisplay (&the_only_perdisplay)
#define all_perdisplays (&the_only_perdisplay)
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#define display_locked 1
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#endif
563

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/* In a cons, the markbit of the car is the gc mark bit */

struct Lisp_Cons
  {
    Lisp_Object car, cdr;
  };

/* Like a cons, but records info on where the text lives that it was read from */
/* This is not really in use now */

struct Lisp_Buffer_Cons
  {
    Lisp_Object car, cdr;
    struct buffer *buffer;
    int bufpos;
  };

/* In a string or vector, the sign bit of the `size' is the gc mark bit */

struct Lisp_String
  {
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    EMACS_INT size;
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    DECLARE_INTERVALS		/* `data' field must be last.  */
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    unsigned char data[1];
  };

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/* If a struct is made to look like a vector, this macro returns the length
   of that vector.  */
#define VECSIZE(type) ((sizeof (type) - (sizeof (struct Lisp_Vector)	\
					 - sizeof (Lisp_Object)))	\
		       / sizeof (Lisp_Object))

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struct Lisp_Vector
  {
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    EMACS_INT size;
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    struct Lisp_Vector *next;
    Lisp_Object contents[1];
  };

/* In a symbol, the markbit of the plist is used as the gc mark bit */

struct Lisp_Symbol
  {
    struct Lisp_String *name;
    Lisp_Object value;
    Lisp_Object function;
    Lisp_Object plist;
    struct Lisp_Symbol *next;	/* -> next symbol in this obarray bucket */
  };

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/* This structure describes a built-in function.
   It is generated by the DEFUN macro only.
   defsubr makes it into a Lisp object.

   This type is treated in most respects as a pseudovector,
   but since we never dynamically allocate or free them,
   we don't need a next-vector field.  */
   
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struct Lisp_Subr
  {
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    EMACS_INT size;
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    Lisp_Object (*function) ();
    short min_args, max_args;
    char *symbol_name;
    char *prompt;
    char *doc;
  };
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/* These structures are used for various misc types.  */

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/* A miscellaneous object, when it's on the free list.  */
struct Lisp_Free
  {
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    int type : 16;	/* = Lisp_Misc_Free */
    int spacer : 16;
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    union Lisp_Misc *chain;
  };
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/* In a marker, the markbit of the chain field is used as the gc mark bit */
struct Lisp_Marker
  {
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    int type : 16;	/* = Lisp_Misc_Marker */
    int spacer : 15;
    /* 1 means normal insertion at the marker's position
       leaves the marker after the inserted text.  */
    int insertion_type : 1;
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    struct buffer *buffer;
    Lisp_Object chain;
    int bufpos;
  };

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/* Forwarding pointer to an int variable.
   This is allowed only in the value cell of a symbol,
   and it means that the symbol's value really lives in the
   specified int variable.  */
struct Lisp_Intfwd
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  {
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    int type : 16;	/* = Lisp_Misc_Intfwd */
    int spacer : 16;
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    int *intvar;
  };

/* Boolean forwarding pointer to an int variable.
   This is like Lisp_Intfwd except that the ostensible
   "value" of the symbol is t if the int variable is nonzero,
   nil if it is zero.  */
struct Lisp_Boolfwd
  {
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    int type : 16;	/* = Lisp_Misc_Boolfwd */
    int spacer : 16;
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    int *boolvar;
  };

/* Forwarding pointer to a Lisp_Object variable.
   This is allowed only in the value cell of a symbol,
   and it means that the symbol's value really lives in the
   specified variable.  */
struct Lisp_Objfwd
  {
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    int type : 16;	/* = Lisp_Misc_Objfwd */
    int spacer : 16;
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    Lisp_Object *objvar;
  };

/* Like Lisp_Objfwd except that value lives in a slot in the
   current buffer.  Value is byte index of slot within buffer.  */
struct Lisp_Buffer_Objfwd
  {
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    int type : 16;	/* = Lisp_Misc_Buffer_Objfwd */
    int spacer : 16;
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    int offset;
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  };

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/* Used in a symbol value cell when the symbol's value is per-buffer.
   The actual contents resemble a cons cell which starts a list like this:
   (REALVALUE BUFFER CURRENT-ALIST-ELEMENT . DEFAULT-VALUE).

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   The cons-like structure is for historical reasons; it might be better
   to just put these elements into the struct, now.

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   BUFFER is the last buffer for which this symbol's value was
   made up to date.

   CURRENT-ALIST-ELEMENT is a pointer to an element of BUFFER's
   local_var_alist, that being the element whose car is this
   variable.  Or it can be a pointer to the
   (CURRENT-ALIST-ELEMENT . DEFAULT-VALUE),
   if BUFFER does not have an element in its alist for this
   variable (that is, if BUFFER sees the default value of this
   variable).

   If we want to examine or set the value and BUFFER is current,
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   we just examine or set REALVALUE.  If BUFFER is not current, we
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   store the current REALVALUE value into CURRENT-ALIST-ELEMENT,
   then find the appropriate alist element for the buffer now
   current and set up CURRENT-ALIST-ELEMENT.  Then we set
   REALVALUE out of that element, and store into BUFFER.

   If we are setting the variable and the current buffer does not
   have an alist entry for this variable, an alist entry is
   created.

   Note that REALVALUE can be a forwarding pointer.  Each time it
   is examined or set, forwarding must be done.  Each time we
   switch buffers, buffer-local variables which forward into C
   variables are swapped immediately, so the C code can assume
   that they are always up to date.

   Lisp_Misc_Buffer_Local_Value and Lisp_Misc_Some_Buffer_Local_Value
   use the same substructure.  The difference is that with the latter,
   merely setting the variable while some buffer is current
   does not cause that buffer to have its own local value of this variable.
   Only make-local-variable does that.  */
struct Lisp_Buffer_Local_Value
  {
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    int type : 16; /* = Lisp_Misc_Buffer_Local_Value
				      or Lisp_Misc_Some_Buffer_Local_Value */
    int spacer : 16;
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    Lisp_Object car, cdr;
  };

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/* In an overlay object, the mark bit of the plist is used as the GC mark.
   START and END are markers in the overlay's buffer, and
   PLIST is the overlay's property list.  */
struct Lisp_Overlay
  {
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    int type : 16;	/* = Lisp_Misc_Overlay */
    int spacer : 16;
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    Lisp_Object start, end, plist;
  };
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/* Like Lisp_Objfwd except that value lives in a slot in the
   current perdisplay.  */
struct Lisp_Display_Objfwd
  {
    int type : 16;	/* = Lisp_Misc_Display_Objfwd */
    int spacer : 16;
    int offset;
  };

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union Lisp_Misc
  {
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    int type : 16;
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    struct Lisp_Free u_free;
    struct Lisp_Marker u_marker;
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    struct Lisp_Intfwd u_intfwd;
    struct Lisp_Boolfwd u_boolfwd;
    struct Lisp_Objfwd u_objfwd;
    struct Lisp_Buffer_Objfwd u_buffer_objfwd;
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    struct Lisp_Buffer_Local_Value u_buffer_local_value;
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    struct Lisp_Overlay u_overlay;
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    struct Lisp_Display_Objfwd u_display_objfwd;
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  };
778

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#ifdef LISP_FLOAT_TYPE
/* Optional Lisp floating point type */
struct Lisp_Float
  {
    Lisp_Object type;		/* essentially used for mark-bit 
				   and chaining when on free-list */
    double data;  
  };
#endif /* LISP_FLOAT_TYPE */

/* A character, declared with the following typedef, is a member
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   of some character set associated with the current buffer.  */
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#ifndef _UCHAR_T  /* Protect against something in ctab.h on AIX.  */
#define _UCHAR_T
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typedef unsigned char UCHAR;
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#endif
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/* Meanings of slots in a Lisp_Compiled:  */

#define COMPILED_ARGLIST 0
#define COMPILED_BYTECODE 1
#define COMPILED_CONSTANTS 2
#define COMPILED_STACK_DEPTH 3
#define COMPILED_DOC_STRING 4
#define COMPILED_INTERACTIVE 5
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/* Flag bits in a character.  These also get used in termhooks.h.
   Richard Stallman <rms@gnu.ai.mit.edu> thinks that MULE
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   (MUlti-Lingual Emacs) might need 22 bits for the character value
   itself, so we probably shouldn't use any bits lower than 0x0400000.  */
#define CHAR_ALT   (0x0400000)
#define CHAR_SUPER (0x0800000)
#define CHAR_HYPER (0x1000000)
#define CHAR_SHIFT (0x2000000)
#define CHAR_CTL   (0x4000000)
#define CHAR_META  (0x8000000)
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#ifdef USE_X_TOOLKIT
#ifdef NO_UNION_TYPE
/* Use this for turning a (void *) into a Lisp_Object, as when the
   Lisp_Object is passed into a toolkit callback function.  */
#define VOID_TO_LISP(larg,varg) \
  do { ((larg) = ((Lisp_Object) (varg))); } while (0)
#define CVOID_TO_LISP VOID_TO_LISP

/* Use this for turning a Lisp_Object into a  (void *), as when the
   Lisp_Object is passed into a toolkit callback function.  */
#define LISP_TO_VOID(larg) ((void *) (larg))
#define LISP_TO_CVOID(varg) ((const void *) (larg))

#else /* not NO_UNION_TYPE */
/* Use this for turning a (void *) into a Lisp_Object, as when the
  Lisp_Object is passed into a toolkit callback function.  */
#define VOID_TO_LISP(larg,varg) \
  do { ((larg).v = (void *) (varg)); } while (0)
#define CVOID_TO_LISP(larg,varg) \
  do { ((larg).cv = (const void *) (varg)); } while (0)

/* Use this for turning a Lisp_Object into a  (void *), as when the
   Lisp_Object is passed into a toolkit callback function.  */
#define LISP_TO_VOID(larg) ((larg).v)
#define LISP_TO_CVOID(larg) ((larg).cv)
#endif /* not NO_UNION_TYPE */
#endif /* USE_X_TOOLKIT */

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/* The glyph datatype, used to represent characters on the display.  */

/* The low eight bits are the character code, and the bits above them
   are the numeric face ID.  If FID is the face ID of a glyph on a
   frame F, then F->display.x->faces[FID] contains the description of
   that face.  This is an int instead of a short, so we can support a
   good bunch of face ID's; given that we have no mechanism for
   tossing unused frame face ID's yet, we'll probably run out of 255
   pretty quickly.  */
#define GLYPH unsigned int

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#ifdef HAVE_FACES
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/* The FAST macros assume that we already know we're in an X window.  */

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/* Given a character code and a face ID, return the appropriate glyph.  */
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#define FAST_MAKE_GLYPH(char, face) ((char) | ((face) << 8))
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/* Return a glyph's character code.  */
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#define FAST_GLYPH_CHAR(glyph) ((glyph) & 0xff)
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/* Return a glyph's face ID.  */
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#define FAST_GLYPH_FACE(glyph) (((glyph) >> 8) & ((1 << 24) - 1))

/* Slower versions that test the frame type first.  */
#define MAKE_GLYPH(f, char, face) (FRAME_TERMCAP_P (f) ? (char) \
				   : FAST_MAKE_GLYPH (char, face))
#define GLYPH_CHAR(f, g) (FRAME_TERMCAP_P (f) ? (g) : FAST_GLYPH_CHAR (g))
#define GLYPH_FACE(f, g) (FRAME_TERMCAP_P (f) ? (0) : FAST_GLYPH_FACE (g))
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#else /* not HAVE_FACES */
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#define MAKE_GLYPH(f, char, face) (char)
#define GLYPH_CHAR(f, g) (g)
#define GLYPH_FACE(f, g) (g)
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#endif /* not HAVE_FACES */
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/* The ID of the mode line highlighting face.  */
#define GLYPH_MODE_LINE_FACE 1
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/* Data type checking */

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#define NILP(x)  (XFASTINT (x) == XFASTINT (Qnil))
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#define GC_NILP(x) GC_EQ (x, Qnil)
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#ifdef LISP_FLOAT_TYPE
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#define NUMBERP(x) (INTEGERP (x) || FLOATP (x))
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#define GC_NUMBERP(x) (GC_INTEGERP (x) || GC_FLOATP (x))
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#else
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#define NUMBERP(x) (INTEGERP (x))
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#define GC_NUMBERP(x) (GC_INTEGERP (x))
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#endif
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#define NATNUMP(x) (INTEGERP (x) && XINT (x) >= 0)
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#define GC_NATNUMP(x) (GC_INTEGERP (x) && XINT (x) >= 0)
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#define INTEGERP(x) (XTYPE ((x)) == Lisp_Int)
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#define GC_INTEGERP(x) (XGCTYPE ((x)) == Lisp_Int)
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#define SYMBOLP(x) (XTYPE ((x)) == Lisp_Symbol)
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#define GC_SYMBOLP(x) (XGCTYPE ((x)) == Lisp_Symbol)
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#define MISCP(x) (XTYPE ((x)) == Lisp_Misc)
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#define GC_MISCP(x) (XGCTYPE ((x)) == Lisp_Misc)
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#define VECTORLIKEP(x) (XTYPE ((x)) == Lisp_Vectorlike)
#define GC_VECTORLIKEP(x) (XGCTYPE ((x)) == Lisp_Vectorlike)
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#define STRINGP(x) (XTYPE ((x)) == Lisp_String)
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#define GC_STRINGP(x) (XGCTYPE ((x)) == Lisp_String)
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#define CONSP(x) (XTYPE ((x)) == Lisp_Cons)
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#define GC_CONSP(x) (XGCTYPE ((x)) == Lisp_Cons)
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#ifdef LISP_FLOAT_TYPE
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#define FLOATP(x) (XTYPE ((x)) == Lisp_Float)
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#define GC_FLOATP(x) (XGCTYPE ((x)) == Lisp_Float)
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#else
#define FLOATP(x) (0)
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#define GC_FLOATP(x) (0)
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#endif
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#define VECTORP(x) (VECTORLIKEP (x) && !(XVECTOR (x)->size & PSEUDOVECTOR_FLAG))
#define GC_VECTORP(x) (GC_VECTORLIKEP (x) && !(XVECTOR (x)->size & PSEUDOVECTOR_FLAG))
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#define OVERLAYP(x) (MISCP (x) && XMISC (x)->type == Lisp_Misc_Overlay)
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#define GC_OVERLAYP(x) (GC_MISCP (x) && XMISC (x)->type == Lisp_Misc_Overlay)
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#define MARKERP(x) (MISCP (x) && XMISC (x)->type == Lisp_Misc_Marker)
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#define GC_MARKERP(x) (GC_MISCP (x) && XMISC (x)->type == Lisp_Misc_Marker)
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#define INTFWDP(x) (MISCP (x) && XMISC (x)->type == Lisp_Misc_Intfwd)
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#define GC_INTFWDP(x) (GC_MISCP (x) && XMISC (x)->type == Lisp_Misc_Intfwd)
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#define BOOLFWDP(x) (MISCP (x) && XMISC (x)->type == Lisp_Misc_Boolfwd)
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#define GC_BOOLFWDP(x) (GC_MISCP (x) && XMISC (x)->type == Lisp_Misc_Boolfwd)
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#define OBJFWDP(x) (MISCP (x) && XMISC (x)->type == Lisp_Misc_Objfwd)
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#define GC_OBJFWDP(x) (GC_MISCP (x) && XMISC (x)->type == Lisp_Misc_Objfwd)
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#define BUFFER_OBJFWDP(x) (MISCP (x) && XMISC (x)->type == Lisp_Misc_Buffer_Objfwd)
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#define GC_BUFFER_OBJFWDP(x) (GC_MISCP (x) && XMISC (x)->type == Lisp_Misc_Buffer_Objfwd)
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#define BUFFER_LOCAL_VALUEP(x) (MISCP (x) && XMISC (x)->type == Lisp_Misc_Buffer_Local_Value)
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#define GC_BUFFER_LOCAL_VALUEP(x) (GC_MISCP (x) && XMISC (x)->type == Lisp_Misc_Buffer_Local_Value)
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#define SOME_BUFFER_LOCAL_VALUEP(x) (MISCP (x) && XMISC (x)->type == Lisp_Misc_Some_Buffer_Local_Value)
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#define GC_SOME_BUFFER_LOCAL_VALUEP(x) (GC_MISCP (x) && XMISC (x)->type == Lisp_Misc_Some_Buffer_Local_Value)
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#define DISPLAY_OBJFWDP(x) (MISCP (x) && XMISC (x)->type == Lisp_Misc_Display_Objfwd)
#define GC_DISPLAY_OBJFWDP(x) (GC_MISCP (x) && XMISC (x)->type == Lisp_Misc_Display_Objfwd)
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/* True if object X is a pseudovector whose code is CODE.  */
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#define PSEUDOVECTORP(x, code)					\
  (VECTORLIKEP (x)						\
   && (((XVECTOR (x)->size & (PSEUDOVECTOR_FLAG | (code))))	\
       == (PSEUDOVECTOR_FLAG | (code))))

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/* True if object X is a pseudovector whose code is CODE.
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   This one works during GC.  */
#define GC_PSEUDOVECTORP(x, code)				\
  (GC_VECTORLIKEP (x)						\
   && (((XVECTOR (x)->size & (PSEUDOVECTOR_FLAG | (code))))	\
       == (PSEUDOVECTOR_FLAG | (code))))

/* Test for specific pseudovector types.  */
#define WINDOW_CONFIGURATIONP(x) PSEUDOVECTORP (x, PVEC_WINDOW_CONFIGURATION)
#define GC_WINDOW_CONFIGURATIONP(x) GC_PSEUDOVECTORP (x, PVEC_WINDOW_CONFIGURATION)
#define PROCESSP(x) PSEUDOVECTORP (x, PVEC_PROCESS)
#define GC_PROCESSP(x) GC_PSEUDOVECTORP (x, PVEC_PROCESS)
#define WINDOWP(x) PSEUDOVECTORP (x, PVEC_WINDOW)
#define GC_WINDOWP(x) GC_PSEUDOVECTORP (x, PVEC_WINDOW)
#define SUBRP(x) PSEUDOVECTORP (x, PVEC_SUBR)
#define GC_SUBRP(x) GC_PSEUDOVECTORP (x, PVEC_SUBR)
#define COMPILEDP(x) PSEUDOVECTORP (x, PVEC_COMPILED)
#define GC_COMPILEDP(x) GC_PSEUDOVECTORP (x, PVEC_COMPILED)
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#define BUFFERP(x) PSEUDOVECTORP (x, PVEC_BUFFER)
#define GC_BUFFERP(x) GC_PSEUDOVECTORP (x, PVEC_BUFFER)
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#ifdef MULTI_FRAME
#define FRAMEP(x) PSEUDOVECTORP (x, PVEC_FRAME)
#define GC_FRAMEP(x) GC_PSEUDOVECTORP (x, PVEC_FRAME)
#else
#ifdef HAVE_MOUSE
/* We could use this in the !HAVE_MOUSE case also, but we prefer a compile-time
   error message in case FRAMEP is used.  */
#define FRAMEP(x) (EQ (x, Fselected_frame ()))
#define GC_FRAMEP(x) (GC_EQ (x, Fselected_frame ()))
#endif
#endif


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#define EQ(x, y) (XFASTINT (x) == XFASTINT (y))
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#define GC_EQ(x, y) (XGCTYPE (x) == XGCTYPE (y) && XPNTR (x) == XPNTR (y))
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#define CHECK_LIST(x, i) \
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  do { if (!CONSP ((x)) && !NILP (x)) x = wrong_type_argument (Qlistp, (x)); } while (0)
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#define CHECK_STRING(x, i) \
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  do { if (!STRINGP ((x))) x = wrong_type_argument (Qstringp, (x)); } while (0)
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#define CHECK_CONS(x, i) \
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  do { if (!CONSP ((x))) x = wrong_type_argument (Qconsp, (x)); } while (0)
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#define CHECK_SYMBOL(x, i) \
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  do { if (!SYMBOLP ((x))) x = wrong_type_argument (Qsymbolp, (x)); } while (0)
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#define CHECK_VECTOR(x, i) \
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  do { if (!VECTORP ((x))) x = wrong_type_argument (Qvectorp, (x)); } while (0)
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#define CHECK_BUFFER(x, i) \
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  do { if (!BUFFERP ((x))) x = wrong_type_argument (Qbufferp, (x)); } while (0)
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#define CHECK_WINDOW(x, i) \
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  do { if (!WINDOWP ((x))) x = wrong_type_argument (Qwindowp, (x)); } while (0)
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/* This macro rejects windows on the interior of the window tree as
   "dead", which is what we want; this is an argument-checking macro, and 
   the user should never get access to interior windows.

   A window of any sort, leaf or interior, is dead iff the buffer,
   vchild, and hchild members are all nil.  */

#define CHECK_LIVE_WINDOW(x, i)				\
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  do {							\
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    if (!WINDOWP ((x))					\
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	|| NILP (XWINDOW ((x))->buffer))		\
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      x = wrong_type_argument (Qwindow_live_p, (x));	\
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  } while (0)
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#define CHECK_PROCESS(x, i) \
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  do { if (!PROCESSP ((x))) x = wrong_type_argument (Qprocessp, (x)); } while (0)
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#define CHECK_NUMBER(x, i) \
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  do { if (!INTEGERP ((x))) x = wrong_type_argument (Qintegerp, (x)); } while (0)
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#define CHECK_NATNUM(x, i) \
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  do { if (!NATNUMP (x)) x = wrong_type_argument (Qwholenump, (x)); } while (0)
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#define CHECK_MARKER(x, i) \
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  do { if (!MARKERP ((x))) x = wrong_type_argument (Qmarkerp, (x)); } while (0)
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#define CHECK_NUMBER_COERCE_MARKER(x, i) \
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  do { if (MARKERP ((x))) XSETFASTINT (x, marker_position (x)); \
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    else if (!INTEGERP ((x))) x = wrong_type_argument (Qinteger_or_marker_p, (x)); } while (0)
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#ifdef LISP_FLOAT_TYPE

#ifndef DBL_DIG
#define DBL_DIG 20
#endif

#define XFLOATINT(n) extract_float((n))

#define CHECK_FLOAT(x, i)		\
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  do { if (!FLOATP (x))			\
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    x = wrong_type_argument (Qfloatp, (x)); } while (0)
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#define CHECK_NUMBER_OR_FLOAT(x, i)	\
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  do { if (!FLOATP (x) && !INTEGERP (x))	\
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    x = wrong_type_argument (Qnumberp, (x)); } while (0)
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#define CHECK_NUMBER_OR_FLOAT_COERCE_MARKER(x, i) \
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  do { if (MARKERP (x)) XSETFASTINT (x, marker_position (x));	\
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  else if (!INTEGERP (x) && !FLOATP (x))		\
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    x = wrong_type_argument (Qnumber_or_marker_p, (x)); } while (0)
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#else  /* Not LISP_FLOAT_TYPE */

#define CHECK_NUMBER_OR_FLOAT CHECK_NUMBER

#define CHECK_NUMBER_OR_FLOAT_COERCE_MARKER CHECK_NUMBER_COERCE_MARKER

#define XFLOATINT(n) XINT((n))
#endif /* LISP_FLOAT_TYPE */

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#define CHECK_OVERLAY(x, i) \
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  do { if (!OVERLAYP ((x))) x = wrong_type_argument (Qoverlayp, (x));} while (0)
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/* Cast pointers to this type to compare them.  Some machines want int.  */
#ifndef PNTR_COMPARISON_TYPE
#define PNTR_COM