lisp.h: Fix a problem with aliasing and vector headers.

[bpt/emacs.git] / src / lisp.h

/* Fundamental definitions for GNU Emacs Lisp interpreter.
   Copyright (C) 1985-1987, 1993-1995, 1997-2011
                 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef EMACS_LISP_H
#define EMACS_LISP_H

#include <stdarg.h>
#include <stddef.h>

/* Use the configure flag --enable-checking[=LIST] to enable various
   types of run time checks for Lisp objects.  */

#ifdef GC_CHECK_CONS_LIST
extern void check_cons_list (void);
#define CHECK_CONS_LIST() check_cons_list ()
#else
#define CHECK_CONS_LIST() ((void) 0)
#endif

/* These are default choices for the types to use.  */
#ifdef _LP64
#ifndef EMACS_INT
#define EMACS_INT long
#define BITS_PER_EMACS_INT BITS_PER_LONG
#define pI "l"
#endif
#ifndef EMACS_UINT
#define EMACS_UINT unsigned long
#endif
#else /* not _LP64 */
#ifndef EMACS_INT
#define EMACS_INT int
#define BITS_PER_EMACS_INT BITS_PER_INT
#define pI ""
#endif
#ifndef EMACS_UINT
#define EMACS_UINT unsigned int
#endif
#endif

/* Extra internal type checking?  */

#ifdef ENABLE_CHECKING

extern void die (const char *, const char *, int) NO_RETURN;

/* The suppress_checking variable is initialized to 0 in alloc.c.  Set
   it to 1 using a debugger to temporarily disable aborting on
   detected internal inconsistencies or error conditions.

   Testing suppress_checking after the supplied condition ensures that
   the side effects produced by CHECK will be consistent, independent
   of whether ENABLE_CHECKING is defined, or whether the checks are
   suppressed at run time.

   In some cases, a good compiler may be able to optimize away the
   CHECK macro altogether, e.g., if XSTRING (x) uses CHECK to test
   STRINGP (x), but a particular use of XSTRING is invoked only after
   testing that STRINGP (x) is true, making the test redundant.  */

extern int suppress_checking EXTERNALLY_VISIBLE;

#define CHECK(check,msg) (((check) || suppress_checking		\
			   ? (void) 0				\
			   : die ((msg), __FILE__, __LINE__)),	\
			  0)
#else

/* Produce same side effects and result, but don't complain.  */
#define CHECK(check,msg) ((check),0)

#endif

/* Define an Emacs version of "assert", since some system ones are
   flaky.  */
#ifndef ENABLE_CHECKING
#define eassert(X) ((void) (0 && (X))) /* Check that X compiles.  */
#else /* ENABLE_CHECKING */
#if defined (__GNUC__) && __GNUC__ >= 2 && defined (__STDC__)
#define eassert(cond) CHECK(cond,"assertion failed: " #cond)
#else
#define eassert(cond) CHECK(cond,"assertion failed")
#endif
#endif /* ENABLE_CHECKING */
\f
/* Use the configure flag --enable-use-lisp-union-type to make
   Lisp_Object use a union type instead of the default int.  The flag
   causes USE_LISP_UNION_TYPE to be defined.  */

/***** Select the tagging scheme.  *****/
/* There are basically two options that control the tagging scheme:
   - USE_LISP_UNION_TYPE says that Lisp_Object should be a union instead
     of an integer.
   - USE_LSB_TAG means that we can assume the least 3 bits of pointers are
     always 0, and we can thus use them to hold tag bits, without
     restricting our addressing space.

   If USE_LSB_TAG is not set, then we use the top 3 bits for tagging, thus
   restricting our possible address range.  Currently USE_LSB_TAG is not
   allowed together with a union.  This is not due to any fundamental
   technical (or political ;-) problem: nobody wrote the code to do it yet.

   USE_LSB_TAG not only requires the least 3 bits of pointers returned by
   malloc to be 0 but also needs to be able to impose a mult-of-8 alignment
   on the few static Lisp_Objects used: all the defsubr as well
   as the two special buffers buffer_defaults and buffer_local_symbols.  */

/* First, try and define DECL_ALIGN(type,var) which declares a static
   variable VAR of type TYPE with the added requirement that it be
   TYPEBITS-aligned. */
#ifndef NO_DECL_ALIGN
# ifndef DECL_ALIGN
#  if HAVE_ATTRIBUTE_ALIGNED
#   define DECL_ALIGN(type, var) \
     type __attribute__ ((__aligned__ (1 << GCTYPEBITS))) var
#  else
     /* What directives do other compilers use?  */
#  endif
# endif
#endif

/* Let's USE_LSB_TAG on systems where we know malloc returns mult-of-8.  */
#if (defined GNU_MALLOC || defined DOUG_LEA_MALLOC || defined __GLIBC__ \
     || defined DARWIN_OS || defined __sun)
/* We also need to be able to specify mult-of-8 alignment on static vars.  */
# if defined DECL_ALIGN
#  define USE_LSB_TAG
# endif
#endif

/* If we cannot use 8-byte alignment, make DECL_ALIGN a no-op.  */
#ifndef DECL_ALIGN
# ifdef USE_LSB_TAG
#  error "USE_LSB_TAG used without defining DECL_ALIGN"
# endif
# define DECL_ALIGN(type, var) type var
#endif


/* Define the fundamental Lisp data structures.  */

/* If USE_2_TAGBITS_FOR_INTS is defined, then Lisp integers use
   2 tags, to give them one extra bit, thus extending their range from
   e.g -2^28..2^28-1 to -2^29..2^29-1.  */
#define USE_2_TAGS_FOR_INTS

/* Making it work for the union case is too much trouble.  */
#ifdef USE_LISP_UNION_TYPE
# undef USE_2_TAGS_FOR_INTS
#endif

/* This is the set of Lisp data types.  */

#if !defined USE_2_TAGS_FOR_INTS
# define LISP_INT_TAG Lisp_Int
# define case_Lisp_Int case Lisp_Int
# define LISP_STRING_TAG 4
# define LISP_INT_TAG_P(x) ((x) == Lisp_Int)
#else
# define LISP_INT_TAG Lisp_Int0
# define case_Lisp_Int case Lisp_Int0: case Lisp_Int1
# ifdef USE_LSB_TAG
#  define LISP_INT1_TAG 4
#  define LISP_STRING_TAG 1
#  define LISP_INT_TAG_P(x) (((x) & 3) == 0)
# else
#  define LISP_INT1_TAG 1
#  define LISP_STRING_TAG 4
#  define LISP_INT_TAG_P(x) (((x) & 6) == 0)
# endif
#endif

enum Lisp_Type
  {
    /* Integer.  XINT (obj) is the integer value.  */
#ifdef USE_2_TAGS_FOR_INTS
    Lisp_Int0 = 0,
    Lisp_Int1 = LISP_INT1_TAG,
#else
    Lisp_Int = 0,
#endif

    /* Symbol.  XSYMBOL (object) points to a struct Lisp_Symbol.  */
    Lisp_Symbol = 2,

    /* Miscellaneous.  XMISC (object) points to a union Lisp_Misc,
       whose first member indicates the subtype.  */
    Lisp_Misc = 3,

    /* String.  XSTRING (object) points to a struct Lisp_String.
       The length of the string, and its contents, are stored therein.  */
    Lisp_String = LISP_STRING_TAG,

    /* Vector of Lisp objects, or something resembling it.
       XVECTOR (object) points to a struct Lisp_Vector, which contains
       the size and contents.  The size field also contains the type
       information, if it's not a real vector object.  */
    Lisp_Vectorlike = 5,

    /* Cons.  XCONS (object) points to a struct Lisp_Cons.  */
    Lisp_Cons = 6,

    Lisp_Float = 7,
  };

/* This is the set of data types that share a common structure.
   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.  */
enum Lisp_Misc_Type
  {
    Lisp_Misc_Free = 0x5eab,
    Lisp_Misc_Marker,
    Lisp_Misc_Overlay,
    Lisp_Misc_Save_Value,
    /* 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
  };

/* These are the types of forwarding objects used in the value slot
   of symbols for special built-in variables whose value is stored in
   C variables.  */
enum Lisp_Fwd_Type
  {
    Lisp_Fwd_Int,		/* Fwd to a C `int' variable.  */
    Lisp_Fwd_Bool,		/* Fwd to a C boolean var.  */
    Lisp_Fwd_Obj,		/* Fwd to a C Lisp_Object variable.  */
    Lisp_Fwd_Buffer_Obj,	/* Fwd to a Lisp_Object field of buffers.  */
    Lisp_Fwd_Kboard_Obj,	/* Fwd to a Lisp_Object field of kboards.  */
  };

#ifndef GCTYPEBITS
#define GCTYPEBITS 3
#endif

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

#ifdef USE_LISP_UNION_TYPE

#ifndef WORDS_BIGENDIAN

/* Definition of Lisp_Object for little-endian machines.  */

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

    struct
      {
	/* Use explict signed, the signedness of a bit-field of type
	   int is implementation defined.  */
	signed EMACS_INT val  : VALBITS;
	enum Lisp_Type type : GCTYPEBITS;
      } s;
    struct
      {
	EMACS_UINT val : VALBITS;
	enum Lisp_Type type : GCTYPEBITS;
      } u;
  }
Lisp_Object;

#else /* If WORDS_BIGENDIAN */

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

    struct
      {
	enum Lisp_Type type : GCTYPEBITS;
	/* Use explict signed, the signedness of a bit-field of type
	   int is implementation defined.  */
	signed EMACS_INT val  : VALBITS;
      } s;
    struct
      {
	enum Lisp_Type type : GCTYPEBITS;
	EMACS_UINT val : VALBITS;
      } u;
  }
Lisp_Object;

#endif /* WORDS_BIGENDIAN */

#ifdef __GNUC__
static __inline__ Lisp_Object
LISP_MAKE_RVALUE (Lisp_Object o)
{
    return o;
}
#else
/* This is more portable to pre-C99 non-GCC compilers, but for
   backwards compatibility GCC still accepts an old GNU extension
   which caused this to only generate a warning.  */
#define LISP_MAKE_RVALUE(o) (0 ? (o) : (o))
#endif

#else /* USE_LISP_UNION_TYPE */

/* If union type is not wanted, define Lisp_Object as just a number.  */

typedef EMACS_INT Lisp_Object;
#define LISP_MAKE_RVALUE(o) (0+(o))
#endif /* USE_LISP_UNION_TYPE */

/* In the size word of a vector, this bit means the vector has been marked.
   (Shift -1 left, not 1, to avoid provoking overflow diagnostics.)  */

#define ARRAY_MARK_FLAG ((EMACS_INT) -1 << (BITS_PER_EMACS_INT - 1))

/* In the size word of a struct Lisp_Vector, this bit means it's really
   some other vector-like object.  */
#define PSEUDOVECTOR_FLAG ((EMACS_INT) 1 << (BITS_PER_EMACS_INT - 2))

/* In a pseudovector, the size field actually contains a word with one
   PSEUDOVECTOR_FLAG bit set, and exactly one of the following bits to
   indicate the actual type.
   We use a bitset, even tho only one of the bits can be set at any
   particular time just so as to be able to use micro-optimizations such as
   testing membership of a particular subset of pseudovectors in Fequal.
   It is not crucial, but there are plenty of bits here, so why not do it?  */
enum pvec_type
{
  PVEC_NORMAL_VECTOR = 0,
  PVEC_PROCESS = 0x200,
  PVEC_FRAME = 0x400,
  PVEC_COMPILED = 0x800,
  PVEC_WINDOW = 0x1000,
  PVEC_WINDOW_CONFIGURATION = 0x2000,
  PVEC_SUBR = 0x4000,
  PVEC_CHAR_TABLE = 0x8000,
  PVEC_BOOL_VECTOR = 0x10000,
  PVEC_BUFFER = 0x20000,
  PVEC_HASH_TABLE = 0x40000,
  PVEC_TERMINAL = 0x80000,
  PVEC_SUB_CHAR_TABLE = 0x100000,
  PVEC_FONT = 0x200000,
  PVEC_OTHER = 0x400000,
  PVEC_TYPE_MASK = 0x7ffe00

#if 0 /* This is used to make the value of PSEUDOVECTOR_FLAG available to
	 GDB.  It doesn't work on OS Alpha.  Moved to a variable in
	 emacs.c.  */
  PVEC_FLAG = PSEUDOVECTOR_FLAG
#endif
};

/* For convenience, we also store the number of elements in these bits.
   Note that this size is not necessarily the memory-footprint size, but
   only the number of Lisp_Object fields (that need to be traced by the GC).
   The distinction is used e.g. by Lisp_Process which places extra
   non-Lisp_Object fields at the end of the structure.  */
#define PSEUDOVECTOR_SIZE_MASK 0x1ff

/* Number of bits to put in each character in the internal representation
   of bool vectors.  This should not vary across implementations.  */
#define BOOL_VECTOR_BITS_PER_CHAR 8
\f
/* These macros extract various sorts of values from a Lisp_Object.
 For example, if tem is a Lisp_Object whose type is Lisp_Cons,
 XCONS (tem) is the struct Lisp_Cons * pointing to the memory for that cons.  */

#ifndef USE_LISP_UNION_TYPE

/* Return a perfect hash of the Lisp_Object representation.  */
#define XHASH(a) (a)

#ifdef USE_LSB_TAG

#define TYPEMASK ((((EMACS_INT) 1) << GCTYPEBITS) - 1)
#define XTYPE(a) ((enum Lisp_Type) (((EMACS_UINT) (a)) & TYPEMASK))
#ifdef USE_2_TAGS_FOR_INTS
# define XINT(a) (((EMACS_INT) (a)) >> (GCTYPEBITS - 1))
# define XUINT(a) (((EMACS_UINT) (a)) >> (GCTYPEBITS - 1))
# define make_number(N) (((EMACS_INT) (N)) << (GCTYPEBITS - 1))
#else
# define XINT(a) (((EMACS_INT) (a)) >> GCTYPEBITS)
# define XUINT(a) (((EMACS_UINT) (a)) >> GCTYPEBITS)
# define make_number(N) (((EMACS_INT) (N)) << GCTYPEBITS)
#endif
#define XSET(var, type, ptr)					\
    (eassert (XTYPE (ptr) == 0), /* Check alignment.  */	\
     (var) = ((EMACS_INT) (type)) | ((EMACS_INT) (ptr)))

#define XPNTR(a) ((EMACS_INT) ((a) & ~TYPEMASK))

#else  /* not USE_LSB_TAG */

#define VALMASK ((((EMACS_INT) 1) << VALBITS) - 1)

/* 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 penalize machines which don't need it)
 */
#define XTYPE(a) ((enum Lisp_Type) (((EMACS_UINT) (a)) >> VALBITS))

/* 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.  */
#define XFASTINT(a) ((a) + 0)
#define XSETFASTINT(a, b) ((a) = (b))

/* Extract the value of a Lisp_Object as a (un)signed integer.  */

#ifdef USE_2_TAGS_FOR_INTS
# define XINT(a) ((((EMACS_INT) (a)) << (GCTYPEBITS - 1)) >> (GCTYPEBITS - 1))
# define XUINT(a) ((EMACS_UINT) ((a) & (1 + (VALMASK << 1))))
# define make_number(N) ((((EMACS_INT) (N)) & (1 + (VALMASK << 1))))
#else
# define XINT(a) ((((EMACS_INT) (a)) << (BITS_PER_EMACS_INT - VALBITS))	\
		 >> (BITS_PER_EMACS_INT - VALBITS))
# define XUINT(a) ((EMACS_UINT) ((a) & VALMASK))
# define make_number(N)		\
  ((((EMACS_INT) (N)) & VALMASK) | ((EMACS_INT) Lisp_Int) << VALBITS)
#endif

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

#ifdef DATA_SEG_BITS
/* DATA_SEG_BITS forces extra bits to be or'd in with any pointers
   which were stored in a Lisp_Object */
#define XPNTR(a) ((EMACS_UINT) (((a) & VALMASK) | DATA_SEG_BITS))
#else
#define XPNTR(a) ((EMACS_UINT) ((a) & VALMASK))
#endif

#endif /* not USE_LSB_TAG */

#else /* USE_LISP_UNION_TYPE */

#ifdef USE_2_TAGS_FOR_INTS
# error "USE_2_TAGS_FOR_INTS is not supported with USE_LISP_UNION_TYPE"
#endif

#define XHASH(a) ((a).i)
#define XTYPE(a) ((enum Lisp_Type) (a).u.type)
#define XINT(a) ((a).s.val)
#define XUINT(a) ((a).u.val)

#ifdef USE_LSB_TAG

# define XSET(var, vartype, ptr) \
  (eassert ((((EMACS_UINT) (ptr)) & ((1 << GCTYPEBITS) - 1)) == 0),	\
   (var).u.val = ((EMACS_UINT) (ptr)) >> GCTYPEBITS,			\
   (var).u.type = ((char) (vartype)))

/* Some versions of gcc seem to consider the bitfield width when issuing
   the "cast to pointer from integer of different size" warning, so the
   cast is here to widen the value back to its natural size.  */
# define XPNTR(v) ((EMACS_INT)((v).s.val) << GCTYPEBITS)

#else  /* !USE_LSB_TAG */

/* 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.  */
# define XFASTINT(a) ((a).i + 0)
# define XSETFASTINT(a, b) ((a).i = (b))

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

#ifdef DATA_SEG_BITS
/* DATA_SEG_BITS forces extra bits to be or'd in with any pointers
   which were stored in a Lisp_Object */
#define XPNTR(a) (XUINT (a) | DATA_SEG_BITS)
#else
#define XPNTR(a) ((EMACS_INT) XUINT (a))
#endif

#endif	/* !USE_LSB_TAG */

#if __GNUC__ >= 2 && defined (__OPTIMIZE__)
#define make_number(N) \
  (__extension__ ({ Lisp_Object _l; _l.s.val = (N); _l.s.type = Lisp_Int; _l; }))
#else
extern Lisp_Object make_number (EMACS_INT);
#endif

#endif /* USE_LISP_UNION_TYPE */

/* For integers known to be positive, XFASTINT sometimes provides
   faster retrieval and XSETFASTINT provides faster storage.
   If not, fallback on the non-accelerated path.  */
#ifndef XFASTINT
# define XFASTINT(a) (XINT (a))
# define XSETFASTINT(a, b) (XSETINT (a, b))
#endif

#define EQ(x, y) (XHASH (x) == XHASH (y))

/* Largest and smallest representable fixnum values.  These are the C
   values.  */

#ifdef USE_2_TAGS_FOR_INTS
# define MOST_NEGATIVE_FIXNUM	- ((EMACS_INT) 1 << VALBITS)
# define MOST_POSITIVE_FIXNUM	(((EMACS_INT) 1 << VALBITS) - 1)
/* Mask indicating the significant bits of a Lisp_Int.
   I.e. (x & INTMASK) == XUINT (make_number (x)).  */
# define INTMASK ((((EMACS_INT) 1) << (VALBITS + 1)) - 1)
#else
# define MOST_NEGATIVE_FIXNUM	- ((EMACS_INT) 1 << (VALBITS - 1))
# define MOST_POSITIVE_FIXNUM	(((EMACS_INT) 1 << (VALBITS - 1)) - 1)
/* Mask indicating the significant bits of a Lisp_Int.
   I.e. (x & INTMASK) == XUINT (make_number (x)).  */
# define INTMASK ((((EMACS_INT) 1) << VALBITS) - 1)
#endif

/* Value is non-zero if I doesn't fit into a Lisp fixnum.  It is
   written this way so that it also works if I is of unsigned
   type.  */

#define FIXNUM_OVERFLOW_P(i) \
  ((i) > MOST_POSITIVE_FIXNUM \
   || ((i) < 0 && (i) < MOST_NEGATIVE_FIXNUM))

/* Extract a value or address from a Lisp_Object.  */

#define XCONS(a) (eassert (CONSP(a)),(struct Lisp_Cons *) XPNTR(a))
#define XVECTOR(a) (eassert (VECTORLIKEP(a)),(struct Lisp_Vector *) XPNTR(a))
#define XSTRING(a) (eassert (STRINGP(a)),(struct Lisp_String *) XPNTR(a))
#define XSYMBOL(a) (eassert (SYMBOLP(a)),(struct Lisp_Symbol *) XPNTR(a))
#define XFLOAT(a) (eassert (FLOATP(a)),(struct Lisp_Float *) XPNTR(a))

/* Extract the size field of a vector or vector-like object.  */

#define XVECTOR_SIZE(a) (XVECTOR (a)->header.size + 0)
#define XVECTOR_HEADER_SIZE(a) (((struct vector_header *) XPNTR (a))->size + 0)

/* Misc types.  */

#define XMISC(a)   ((union Lisp_Misc *) XPNTR(a))
#define XMISCANY(a)	(eassert (MISCP (a)), &(XMISC(a)->u_any))
#define XMISCTYPE(a)   (XMISCANY (a)->type)
#define XMARKER(a)	(eassert (MARKERP (a)), &(XMISC(a)->u_marker))
#define XOVERLAY(a)	(eassert (OVERLAYP (a)), &(XMISC(a)->u_overlay))
#define XSAVE_VALUE(a)	(eassert (SAVE_VALUEP (a)), &(XMISC(a)->u_save_value))

/* Forwarding object types.  */

#define XFWDTYPE(a)     (a->u_intfwd.type)
#define XINTFWD(a)	(eassert (INTFWDP (a)), &((a)->u_intfwd))
#define XBOOLFWD(a)	(eassert (BOOLFWDP (a)), &((a)->u_boolfwd))
#define XOBJFWD(a)	(eassert (OBJFWDP (a)), &((a)->u_objfwd))
#define XBUFFER_OBJFWD(a) \
  (eassert (BUFFER_OBJFWDP (a)), &((a)->u_buffer_objfwd))
#define XKBOARD_OBJFWD(a) \
  (eassert (KBOARD_OBJFWDP (a)), &((a)->u_kboard_objfwd))

/* Pseudovector types.  */

#define XPROCESS(a) (eassert (PROCESSP(a)),(struct Lisp_Process *) XPNTR(a))
#define XWINDOW(a) (eassert (WINDOWP(a)),(struct window *) XPNTR(a))
#define XTERMINAL(a) (eassert (TERMINALP(a)),(struct terminal *) XPNTR(a))
#define XSUBR(a) (eassert (SUBRP(a)),(struct Lisp_Subr *) XPNTR(a))
#define XBUFFER(a) (eassert (BUFFERP(a)),(struct buffer *) XPNTR(a))
#define XCHAR_TABLE(a) (eassert (CHAR_TABLE_P (a)), (struct Lisp_Char_Table *) XPNTR(a))
#define XSUB_CHAR_TABLE(a) (eassert (SUB_CHAR_TABLE_P (a)), (struct Lisp_Sub_Char_Table *) XPNTR(a))
#define XBOOL_VECTOR(a) (eassert (BOOL_VECTOR_P (a)), (struct Lisp_Bool_Vector *) XPNTR(a))

/* Construct a Lisp_Object from a value or address.  */

#define XSETINT(a, b) (a) = make_number (b)
#define XSETCONS(a, b) XSET (a, Lisp_Cons, b)
#define XSETVECTOR(a, b) XSET (a, Lisp_Vectorlike, b)
#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)

/* Misc types.  */

#define XSETMISC(a, b) XSET (a, Lisp_Misc, b)
#define XSETMARKER(a, b) (XSETMISC (a, b), XMISCTYPE (a) = Lisp_Misc_Marker)

/* Pseudovector types.  */

#define XSETPVECTYPE(v, code) XSETTYPED_PVECTYPE(v, header.size, code)
#define XSETTYPED_PVECTYPE(v, size_member, code) \
  ((v)->size_member |= PSEUDOVECTOR_FLAG | (code))
#define XSETPVECTYPESIZE(v, code, sizeval) \
  ((v)->header.size = PSEUDOVECTOR_FLAG | (code) | (sizeval))
#define XSETPSEUDOVECTOR(a, b, code) \
  XSETTYPED_PSEUDOVECTOR(a, b, XVECTOR_HEADER_SIZE (a), code)
#define XSETTYPED_PSEUDOVECTOR(a, b, size, code)			\
  (XSETVECTOR (a, b),							\
   eassert ((size & (PSEUDOVECTOR_FLAG | PVEC_TYPE_MASK))		\
	    == (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 XSETTERMINAL(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_TERMINAL))
#define XSETSUBR(a, b) \
  XSETTYPED_PSEUDOVECTOR (a, b, XSUBR (a)->size, PVEC_SUBR)
#define XSETCOMPILED(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_COMPILED))
#define XSETBUFFER(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_BUFFER))
#define XSETCHAR_TABLE(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_CHAR_TABLE))
#define XSETBOOL_VECTOR(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_BOOL_VECTOR))
#define XSETSUB_CHAR_TABLE(a, b) (XSETPSEUDOVECTOR (a, b, PVEC_SUB_CHAR_TABLE))

/* Convenience macros for dealing with Lisp arrays.  */

#define AREF(ARRAY, IDX)	XVECTOR ((ARRAY))->contents[IDX]
#define ASIZE(ARRAY)		XVECTOR_SIZE (ARRAY)
/* The IDX==IDX tries to detect when the macro argument is side-effecting.  */
#define ASET(ARRAY, IDX, VAL)	\
  (eassert ((IDX) == (IDX)),				\
   eassert ((IDX) >= 0 && (IDX) < ASIZE (ARRAY)),	\
   AREF ((ARRAY), (IDX)) = (VAL))

/* Convenience macros for dealing with Lisp strings.  */

#define SDATA(string)		(XSTRING (string)->data + 0)
#define SREF(string, index)	(SDATA (string)[index] + 0)
#define SSET(string, index, new) (SDATA (string)[index] = (new))
#define SCHARS(string)		(XSTRING (string)->size + 0)
#define SBYTES(string)		(STRING_BYTES (XSTRING (string)) + 0)

/* Avoid "differ in sign" warnings.  */
#define SSDATA(x)  ((char *) SDATA (x))

#define STRING_SET_CHARS(string, newsize) \
    (XSTRING (string)->size = (newsize))

#define STRING_COPYIN(string, index, new, count) \
    memcpy (SDATA (string) + index, new, count)

/* Type checking.  */

#define CHECK_TYPE(ok, Qxxxp, x) \
  do { if (!(ok)) wrong_type_argument (Qxxxp, (x)); } while (0)


\f
/* See the macros in intervals.h.  */

typedef struct interval *INTERVAL;

/* Complain if object is not string or buffer type */
#define CHECK_STRING_OR_BUFFER(x) \
  CHECK_TYPE (STRINGP (x) || BUFFERP (x), Qbuffer_or_string_p, x)

\f
/* In a cons, the markbit of the car is the gc mark bit */

struct Lisp_Cons
  {
    /* Please do not use the names of these elements in code other
       than the core lisp implementation.  Use XCAR and XCDR below.  */
#ifdef HIDE_LISP_IMPLEMENTATION
    Lisp_Object car_;
    union
    {
      Lisp_Object cdr_;
      struct Lisp_Cons *chain;
    } u;
#else
    Lisp_Object car;
    union
    {
      Lisp_Object cdr;
      struct Lisp_Cons *chain;
    } u;
#endif
  };

/* Take the car or cdr of something known to be a cons cell.  */
/* The _AS_LVALUE macros shouldn't be used outside of the minimal set
   of code that has to know what a cons cell looks like.  Other code not
   part of the basic lisp implementation should assume that the car and cdr
   fields are not accessible as lvalues.  (What if we want to switch to
   a copying collector someday?  Cached cons cell field addresses may be
   invalidated at arbitrary points.)  */
#ifdef HIDE_LISP_IMPLEMENTATION
#define XCAR_AS_LVALUE(c) (XCONS ((c))->car_)
#define XCDR_AS_LVALUE(c) (XCONS ((c))->u.cdr_)
#else
#define XCAR_AS_LVALUE(c) (XCONS ((c))->car)
#define XCDR_AS_LVALUE(c) (XCONS ((c))->u.cdr)
#endif

/* Use these from normal code.  */
#define XCAR(c)	LISP_MAKE_RVALUE(XCAR_AS_LVALUE(c))
#define XCDR(c) LISP_MAKE_RVALUE(XCDR_AS_LVALUE(c))

/* Use these to set the fields of a cons cell.

   Note that both arguments may refer to the same object, so 'n'
   should not be read after 'c' is first modified.  Also, neither
   argument should be evaluated more than once; side effects are
   especially common in the second argument.  */
#define XSETCAR(c,n) (XCAR_AS_LVALUE(c) = (n))
#define XSETCDR(c,n) (XCDR_AS_LVALUE(c) = (n))

/* Take the car or cdr of something whose type is not known.  */
#define CAR(c)					\
 (CONSP ((c)) ? XCAR ((c))			\
  : NILP ((c)) ? Qnil				\
  : wrong_type_argument (Qlistp, (c)))

#define CDR(c)					\
 (CONSP ((c)) ? XCDR ((c))			\
  : NILP ((c)) ? Qnil				\
  : wrong_type_argument (Qlistp, (c)))

/* Take the car or cdr of something whose type is not known.  */
#define CAR_SAFE(c)				\
  (CONSP ((c)) ? XCAR ((c)) : Qnil)

#define CDR_SAFE(c)				\
  (CONSP ((c)) ? XCDR ((c)) : Qnil)

/* Nonzero if STR is a multibyte string.  */
#define STRING_MULTIBYTE(STR)  \
  (XSTRING (STR)->size_byte >= 0)

/* Return the length in bytes of STR.  */

#ifdef GC_CHECK_STRING_BYTES

struct Lisp_String;
extern EMACS_INT string_bytes (struct Lisp_String *);
#define STRING_BYTES(S) string_bytes ((S))

#else /* not GC_CHECK_STRING_BYTES */

#define STRING_BYTES(STR)  \
  ((STR)->size_byte < 0 ? (STR)->size : (STR)->size_byte)

#endif /* not GC_CHECK_STRING_BYTES */

/* Mark STR as a unibyte string.  */
#define STRING_SET_UNIBYTE(STR)  \
  do { if (EQ (STR, empty_multibyte_string))  \
      (STR) = empty_unibyte_string;  \
    else XSTRING (STR)->size_byte = -1; } while (0)

/* Mark STR as a multibyte string.  Assure that STR contains only
   ASCII characters in advance.  */
#define STRING_SET_MULTIBYTE(STR)  \
  do { if (EQ (STR, empty_unibyte_string))  \
      (STR) = empty_multibyte_string;  \
    else XSTRING (STR)->size_byte = XSTRING (STR)->size; } while (0)

/* Get text properties.  */
#define STRING_INTERVALS(STR)  (XSTRING (STR)->intervals + 0)

/* Set text properties.  */
#define STRING_SET_INTERVALS(STR, INT) (XSTRING (STR)->intervals = (INT))

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

struct Lisp_String
  {
    EMACS_INT size;
    EMACS_INT size_byte;
    INTERVAL intervals;		/* text properties in this string */
    unsigned char *data;
  };

/* Header of vector-like objects.  This type documents the constraints on
   layout of vectors and pseudovectors, and helps optimizing compilers not get
   fooled by Emacs's type punning.  */
struct vector_header
  {
    EMACS_UINT size;
    union {
      struct buffer *buffer;
      struct Lisp_Vector *vector;
    } next;
  };

struct Lisp_Vector
  {
    struct vector_header header;
    Lisp_Object contents[1];
  };

/* If a struct is made to look like a vector, this macro returns the length
   of the shortest vector that would hold that struct.  */
#define VECSIZE(type) ((sizeof (type)					  \
			- offsetof (struct Lisp_Vector, contents[0])      \
                        + sizeof(Lisp_Object) - 1) /* round up */	  \
		       / sizeof (Lisp_Object))

/* Like VECSIZE, but used when the pseudo-vector has non-Lisp_Object fields
   at the end and we need to compute the number of Lisp_Object fields (the
   ones that the GC needs to trace).  */
#define PSEUDOVECSIZE(type, nonlispfield) \
  ((offsetof(type, nonlispfield) - offsetof(struct Lisp_Vector, contents[0])) \
   / sizeof (Lisp_Object))

/* A char-table is a kind of vectorlike, with contents are like a
   vector but with a few other slots.  For some purposes, it makes
   sense to handle a char-table with type struct Lisp_Vector.  An
   element of a char table can be any Lisp objects, but if it is a sub
   char-table, we treat it a table that contains information of a
   specific range of characters.  A sub char-table has the same
   structure as a vector.  A sub char table appears only in an element
   of a char-table, and there's no way to access it directly from
   Emacs Lisp program.  */

/* This is the number of slots that every char table must have.  This
   counts the ordinary slots and the top, defalt, parent, and purpose
   slots.  */
#define CHAR_TABLE_STANDARD_SLOTS (VECSIZE (struct Lisp_Char_Table) - 1)

/* Return the number of "extra" slots in the char table CT.  */

#define CHAR_TABLE_EXTRA_SLOTS(CT)	\
  (((CT)->header.size & PSEUDOVECTOR_SIZE_MASK) - CHAR_TABLE_STANDARD_SLOTS)

#ifdef __GNUC__

#define CHAR_TABLE_REF_ASCII(CT, IDX)					\
  ({struct Lisp_Char_Table *_tbl = NULL;				\
    Lisp_Object _val;							\
    do {								\
      _tbl = _tbl ? XCHAR_TABLE (_tbl->parent) : XCHAR_TABLE (CT);	\
      _val = (! SUB_CHAR_TABLE_P (_tbl->ascii) ? _tbl->ascii		\
	      : XSUB_CHAR_TABLE (_tbl->ascii)->contents[IDX]);		\
      if (NILP (_val))							\
	_val = _tbl->defalt;						\
    } while (NILP (_val) && ! NILP (_tbl->parent));			\
    _val; })

#else  /* not __GNUC__ */

#define CHAR_TABLE_REF_ASCII(CT, IDX)					  \
  (! NILP (XCHAR_TABLE (CT)->ascii)					  \
   ? (! SUB_CHAR_TABLE_P (XCHAR_TABLE (CT)->ascii)			  \
      ? XCHAR_TABLE (CT)->ascii						  \
      : ! NILP (XSUB_CHAR_TABLE (XCHAR_TABLE (CT)->ascii)->contents[IDX]) \
      ? XSUB_CHAR_TABLE (XCHAR_TABLE (CT)->ascii)->contents[IDX]	  \
      : char_table_ref ((CT), (IDX)))					  \
   :  char_table_ref ((CT), (IDX)))

#endif	/* not __GNUC__ */

/* Nonzero iff C is an ASCII character.  */
#define ASCII_CHAR_P(c) ((unsigned) (c) < 0x80)

/* Almost equivalent to Faref (CT, IDX) with optimization for ASCII
   characters.  Do not check validity of CT.  */
#define CHAR_TABLE_REF(CT, IDX)					\
  (ASCII_CHAR_P (IDX) ? CHAR_TABLE_REF_ASCII ((CT), (IDX))	\
   : char_table_ref ((CT), (IDX)))

/* Almost equivalent to Faref (CT, IDX).  However, if the result is
   not a character, return IDX.

   For these characters, do not check validity of CT
   and do not follow parent.  */
#define CHAR_TABLE_TRANSLATE(CT, IDX)	\
  char_table_translate (CT, IDX)

/* Equivalent to Faset (CT, IDX, VAL) with optimization for ASCII and
   8-bit European characters.  Do not check validity of CT.  */
#define CHAR_TABLE_SET(CT, IDX, VAL)					\
  (((IDX) >= 0 && ASCII_CHAR_P (IDX)					\
    && SUB_CHAR_TABLE_P (XCHAR_TABLE (CT)->ascii))			\
   ? XSUB_CHAR_TABLE (XCHAR_TABLE (CT)->ascii)->contents[IDX] = VAL	\
   : char_table_set (CT, IDX, VAL))

#define CHARTAB_SIZE_BITS_0 6
#define CHARTAB_SIZE_BITS_1 4
#define CHARTAB_SIZE_BITS_2 5
#define CHARTAB_SIZE_BITS_3 7

extern const int chartab_size[4];

struct Lisp_Sub_Char_Table;

struct Lisp_Char_Table
  {
    /* HEADER.SIZE is the vector's size field, which also holds the
       pseudovector type information.  It holds the size, too.
       The size counts the defalt, parent, purpose, ascii,
       contents, and extras slots.  */
    struct vector_header header;

    /* This holds a default value,
       which is used whenever the value for a specific character is nil.  */
    Lisp_Object defalt;

    /* This points to another char table, which we inherit from when the
       value for a specific character is nil.  The `defalt' slot takes
       precedence over this.  */
    Lisp_Object parent;

    /* This is a symbol which says what kind of use this char-table is
       meant for.  */
    Lisp_Object purpose;

    /* The bottom sub char-table for characters of the range 0..127.  It
       is nil if none of ASCII character has a specific value.  */
    Lisp_Object ascii;

    Lisp_Object contents[(1 << CHARTAB_SIZE_BITS_0)];

    /* These hold additional data.  It is a vector.  */
    Lisp_Object extras[1];
  };

struct Lisp_Sub_Char_Table
  {
    /* HEADER.SIZE is the vector's size field, which also holds the
       pseudovector type information.  It holds the size, too.  */
    struct vector_header header;

    /* Depth of this sub char-table.  It should be 1, 2, or 3.  A sub
       char-table of depth 1 contains 16 elements, and each element
       covers 4096 (128*32) characters.  A sub char-table of depth 2
       contains 32 elements, and each element covers 128 characters.  A
       sub char-table of depth 3 contains 128 elements, and each element
       is for one character.  */
    Lisp_Object depth;

    /* Minimum character covered by the sub char-table.  */
    Lisp_Object min_char;

    Lisp_Object contents[1];
  };

/* A boolvector is a kind of vectorlike, with contents are like a string.  */
struct Lisp_Bool_Vector
  {
    /* HEADER.SIZE is the vector's size field.  It doesn't have the real size,
       just the subtype information.  */
    struct vector_header header;
    /* This is the size in bits.  */
    EMACS_UINT size;
    /* This contains the actual bits, packed into bytes.  */
    unsigned char data[1];
  };

/* 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 struct vector_header and its 'next' field.  */

struct Lisp_Subr
  {
    EMACS_UINT size;
    union {
      Lisp_Object (*a0) (void);
      Lisp_Object (*a1) (Lisp_Object);
      Lisp_Object (*a2) (Lisp_Object, Lisp_Object);
      Lisp_Object (*a3) (Lisp_Object, Lisp_Object, Lisp_Object);
      Lisp_Object (*a4) (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
      Lisp_Object (*a5) (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
      Lisp_Object (*a6) (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
      Lisp_Object (*a7) (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
      Lisp_Object (*a8) (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
      Lisp_Object (*aUNEVALLED) (Lisp_Object args);
      Lisp_Object (*aMANY) (size_t, Lisp_Object *);
    } function;
    short min_args, max_args;
    const char *symbol_name;
    const char *intspec;
    const char *doc;
  };

\f
/***********************************************************************
			       Symbols
 ***********************************************************************/

/* Interned state of a symbol.  */

enum symbol_interned
{
  SYMBOL_UNINTERNED = 0,
  SYMBOL_INTERNED = 1,
  SYMBOL_INTERNED_IN_INITIAL_OBARRAY = 2
};

enum symbol_redirect
{
  SYMBOL_PLAINVAL  = 4,
  SYMBOL_VARALIAS  = 1,
  SYMBOL_LOCALIZED = 2,
  SYMBOL_FORWARDED   = 3
};

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

struct Lisp_Symbol
{
  unsigned gcmarkbit : 1;

  /* Indicates where the value can be found:
     0 : it's a plain var, the value is in the `value' field.
     1 : it's a varalias, the value is really in the `alias' symbol.
     2 : it's a localized var, the value is in the `blv' object.
     3 : it's a forwarding variable, the value is in `forward'.
   */
  enum symbol_redirect redirect : 3;

  /* Non-zero means symbol is constant, i.e. changing its value
     should signal an error.  If the value is 3, then the var
     can be changed, but only by `defconst'.  */
  unsigned constant : 2;

  /* Interned state of the symbol.  This is an enumerator from
     enum symbol_interned.  */
  unsigned interned : 2;

  /* Non-zero means that this variable has been explicitly declared
     special (with `defvar' etc), and shouldn't be lexically bound.  */
  unsigned declared_special : 1;

  /* The symbol's name, as a Lisp string.

     The name "xname" is used to intentionally break code referring to
     the old field "name" of type pointer to struct Lisp_String.  */
  Lisp_Object xname;

  /* Value of the symbol or Qunbound if unbound.  If this symbol is a
     defvaralias, `alias' contains the symbol for which it is an
     alias.  Use the SYMBOL_VALUE and SET_SYMBOL_VALUE macros to get
     and set a symbol's value, to take defvaralias into account.  */
  union {
    Lisp_Object value;
    struct Lisp_Symbol *alias;
    struct Lisp_Buffer_Local_Value *blv;
    union Lisp_Fwd *fwd;
  } val;

  /* Function value of the symbol or Qunbound if not fboundp.  */
  Lisp_Object function;

  /* The symbol's property list.  */
  Lisp_Object plist;

  /* Next symbol in obarray bucket, if the symbol is interned.  */
  struct Lisp_Symbol *next;
};

/* Value is name of symbol.  */

#define SYMBOL_VAL(sym)   \
  (eassert ((sym)->redirect == SYMBOL_PLAINVAL),  (sym)->val.value)
#define SYMBOL_ALIAS(sym) \
  (eassert ((sym)->redirect == SYMBOL_VARALIAS),  (sym)->val.alias)
#define SYMBOL_BLV(sym)   \
  (eassert ((sym)->redirect == SYMBOL_LOCALIZED), (sym)->val.blv)
#define SYMBOL_FWD(sym)   \
  (eassert ((sym)->redirect == SYMBOL_FORWARDED), (sym)->val.fwd)
#define SET_SYMBOL_VAL(sym, v)     \
  (eassert ((sym)->redirect == SYMBOL_PLAINVAL),  (sym)->val.value = (v))
#define SET_SYMBOL_ALIAS(sym, v)   \
  (eassert ((sym)->redirect == SYMBOL_VARALIAS),  (sym)->val.alias = (v))
#define SET_SYMBOL_BLV(sym, v)     \
  (eassert ((sym)->redirect == SYMBOL_LOCALIZED), (sym)->val.blv = (v))
#define SET_SYMBOL_FWD(sym, v) \
  (eassert ((sym)->redirect == SYMBOL_FORWARDED), (sym)->val.fwd = (v))

#define SYMBOL_NAME(sym)  \
     LISP_MAKE_RVALUE (XSYMBOL (sym)->xname)

/* Value is non-zero if SYM is an interned symbol.  */

#define SYMBOL_INTERNED_P(sym)  \
     (XSYMBOL (sym)->interned != SYMBOL_UNINTERNED)

/* Value is non-zero if SYM is interned in initial_obarray.  */

#define SYMBOL_INTERNED_IN_INITIAL_OBARRAY_P(sym) \
     (XSYMBOL (sym)->interned == SYMBOL_INTERNED_IN_INITIAL_OBARRAY)

/* Value is non-zero if symbol is considered a constant, i.e. its
   value cannot be changed (there is an exception for keyword symbols,
   whose value can be set to the keyword symbol itself).  */

#define SYMBOL_CONSTANT_P(sym)   XSYMBOL (sym)->constant

\f
/***********************************************************************
			     Hash Tables
 ***********************************************************************/

/* The structure of a Lisp hash table.  */

struct Lisp_Hash_Table
{
  /* This is for Lisp; the hash table code does not refer to it.  */
  struct vector_header header;

  /* Function used to compare keys.  */
  Lisp_Object test;

  /* Nil if table is non-weak.  Otherwise a symbol describing the
     weakness of the table.  */
  Lisp_Object weak;

  /* When the table is resized, and this is an integer, compute the
     new size by adding this to the old size.  If a float, compute the
     new size by multiplying the old size with this factor.  */
  Lisp_Object rehash_size;

  /* Resize hash table when number of entries/ table size is >= this
     ratio, a float.  */
  Lisp_Object rehash_threshold;

  /* Vector of hash codes.. If hash[I] is nil, this means that that
     entry I is unused.  */
  Lisp_Object hash;

  /* Vector used to chain entries.  If entry I is free, next[I] is the
     entry number of the next free item.  If entry I is non-free,
     next[I] is the index of the next entry in the collision chain.  */
  Lisp_Object next;

  /* Index of first free entry in free list.  */
  Lisp_Object next_free;

  /* Bucket vector.  A non-nil entry is the index of the first item in
     a collision chain.  This vector's size can be larger than the
     hash table size to reduce collisions.  */
  Lisp_Object index;

  /* User-supplied hash function, or nil.  */
  Lisp_Object user_hash_function;

  /* User-supplied key comparison function, or nil.  */
  Lisp_Object user_cmp_function;

  /* Only the fields above are traced normally by the GC.  The ones below
     `count' are special and are either ignored by the GC or traced in
     a special way (e.g. because of weakness).  */

  /* Number of key/value entries in the table.  */
  unsigned int count;

  /* Vector of keys and values.  The key of item I is found at index
     2 * I, the value is found at index 2 * I + 1.
     This is gc_marked specially if the table is weak.  */
  Lisp_Object key_and_value;

  /* Next weak hash table if this is a weak hash table.  The head
     of the list is in weak_hash_tables.  */
  struct Lisp_Hash_Table *next_weak;

  /* C function to compare two keys.  */
  int (* cmpfn) (struct Lisp_Hash_Table *, Lisp_Object,
                 unsigned, Lisp_Object, unsigned);

  /* C function to compute hash code.  */
  unsigned (* hashfn) (struct Lisp_Hash_Table *, Lisp_Object);
};


#define XHASH_TABLE(OBJ) \
     ((struct Lisp_Hash_Table *) XPNTR (OBJ))

#define XSET_HASH_TABLE(VAR, PTR) \
     (XSETPSEUDOVECTOR (VAR, PTR, PVEC_HASH_TABLE))

#define HASH_TABLE_P(OBJ)  PSEUDOVECTORP (OBJ, PVEC_HASH_TABLE)

#define CHECK_HASH_TABLE(x) \
  CHECK_TYPE (HASH_TABLE_P (x), Qhash_table_p, x)

/* Value is the key part of entry IDX in hash table H.  */

#define HASH_KEY(H, IDX)   AREF ((H)->key_and_value, 2 * (IDX))

/* Value is the value part of entry IDX in hash table H.  */

#define HASH_VALUE(H, IDX) AREF ((H)->key_and_value, 2 * (IDX) + 1)

/* Value is the index of the next entry following the one at IDX
   in hash table H.  */

#define HASH_NEXT(H, IDX)  AREF ((H)->next, (IDX))

/* Value is the hash code computed for entry IDX in hash table H.  */

#define HASH_HASH(H, IDX)  AREF ((H)->hash, (IDX))

/* Value is the index of the element in hash table H that is the
   start of the collision list at index IDX in the index vector of H.  */

#define HASH_INDEX(H, IDX)  AREF ((H)->index, (IDX))

/* Value is the size of hash table H.  */

#define HASH_TABLE_SIZE(H) XVECTOR_SIZE ((H)->next)

/* Default size for hash tables if not specified.  */

#define DEFAULT_HASH_SIZE 65

/* Default threshold specifying when to resize a hash table.  The
   value gives the ratio of current entries in the hash table and the
   size of the hash table.  */

#define DEFAULT_REHASH_THRESHOLD 0.8

/* Default factor by which to increase the size of a hash table.  */

#define DEFAULT_REHASH_SIZE 1.5

\f
/* These structures are used for various misc types.  */

struct Lisp_Misc_Any		/* Supertype of all Misc types.  */
{
  enum Lisp_Misc_Type type : 16;		/* = Lisp_Misc_??? */
  unsigned gcmarkbit : 1;
  int spacer : 15;
  /* Make it as long as "Lisp_Free without padding". */
  void *fill;
};

struct Lisp_Marker
{
  enum Lisp_Misc_Type type : 16;		/* = Lisp_Misc_Marker */
  unsigned gcmarkbit : 1;
  int spacer : 13;
  /* This flag is temporarily used in the functions
     decode/encode_coding_object to record that the marker position
     must be adjusted after the conversion.  */
  unsigned int need_adjustment : 1;
  /* 1 means normal insertion at the marker's position
     leaves the marker after the inserted text.  */
  unsigned int insertion_type : 1;
  /* This is the buffer that the marker points into, or 0 if it points nowhere.
     Note: a chain of markers can contain markers pointing into different
     buffers (the chain is per buffer_text rather than per buffer, so it's
     shared between indirect buffers).  */
  /* This is used for (other than NULL-checking):
     - Fmarker_buffer
     - Fset_marker: check eq(oldbuf, newbuf) to avoid unchain+rechain.
     - unchain_marker: to find the list from which to unchain.
     - Fkill_buffer: to only unchain the markers of current indirect buffer.
     */
  struct buffer *buffer;

  /* The remaining fields are meaningless in a marker that
     does not point anywhere.  */

  /* For markers that point somewhere,
     this is used to chain of all the markers in a given buffer.  */
  /* We could remove it and use an array in buffer_text instead.
     That would also allow to preserve it ordered.  */
  struct Lisp_Marker *next;
  /* This is the char position where the marker points.  */
  EMACS_INT charpos;
  /* This is the byte position.
     It's mostly used as a charpos<->bytepos cache (i.e. it's not directly
     used to implement the functionality of markers, but rather to (ab)use
     markers as a cache for char<->byte mappings).  */
  EMACS_INT bytepos;
};

/* 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
  {
    enum Lisp_Fwd_Type type;	/* = Lisp_Fwd_Int */
    EMACS_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
  {
    enum Lisp_Fwd_Type type;	/* = Lisp_Fwd_Bool */
    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
  {
    enum Lisp_Fwd_Type type;	/* = Lisp_Fwd_Obj */
    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
  {
    enum Lisp_Fwd_Type type;	/* = Lisp_Fwd_Buffer_Obj */
    int offset;
    Lisp_Object slottype; /* Qnil, Lisp_Int, Lisp_Symbol, or Lisp_String.  */
  };

/* struct Lisp_Buffer_Local_Value is used in a symbol value cell when
   the symbol has buffer-local or frame-local bindings.  (Exception:
   some buffer-local variables are built-in, with their values stored
   in the buffer structure itself.  They are handled differently,
   using struct Lisp_Buffer_Objfwd.)

   The `realvalue' slot holds the variable's current value, or a
   forwarding pointer to where that value is kept.  This value is the
   one that corresponds to the loaded binding.  To read or set the
   variable, you must first make sure the right binding is loaded;
   then you can access the value in (or through) `realvalue'.

   `buffer' and `frame' are the buffer and frame for which the loaded
   binding was found.  If those have changed, to make sure the right
   binding is loaded it is necessary to find which binding goes with
   the current buffer and selected frame, then load it.  To load it,
   first unload the previous binding, then copy the value of the new
   binding into `realvalue' (or through it).  Also update
   LOADED-BINDING to point to the newly loaded binding.

   `local_if_set' indicates that merely setting the variable creates a
   local binding for the current buffer.  Otherwise the latter, setting
   the variable does not do that; only make-local-variable does that.  */

struct Lisp_Buffer_Local_Value
  {
    /* 1 means that merely setting the variable creates a local
       binding for the current buffer */
    unsigned int local_if_set : 1;
    /* 1 means this variable can have frame-local bindings, otherwise, it is
       can have buffer-local bindings.  The two cannot be combined.  */
    unsigned int frame_local : 1;
    /* 1 means that the binding now loaded was found.
       Presumably equivalent to (defcell!=valcell) */
    unsigned int found : 1;
    /* If non-NULL, a forwarding to the C var where it should also be set.  */
    union Lisp_Fwd *fwd;	/* Should never be (Buffer|Kboard)_Objfwd.  */
    /* The buffer or frame for which the loaded binding was found.  */
    Lisp_Object where;
    /* A cons cell that holds the default value.  It has the form
       (SYMBOL . DEFAULT-VALUE).  */
    Lisp_Object defcell;
    /* The cons cell from `where's parameter alist.
       It always has the form (SYMBOL . VALUE)
       Note that if `forward' is non-nil, VALUE may be out of date.
       Also if the currently loaded binding is the default binding, then
       this is `eq'ual to defcell.  */
    Lisp_Object valcell;
  };

#define BLV_FOUND(blv) \
  (eassert ((blv)->found == !EQ ((blv)->defcell, (blv)->valcell)), (blv)->found)
#define SET_BLV_FOUND(blv, v) \
  (eassert ((v) == !EQ ((blv)->defcell, (blv)->valcell)), (blv)->found = (v))

#define BLV_VALUE(blv) (XCDR ((blv)->valcell))
#define SET_BLV_VALUE(blv, v) (XSETCDR ((blv)->valcell, v))

/* START and END are markers in the overlay's buffer, and
   PLIST is the overlay's property list.  */
struct Lisp_Overlay
/* An overlay's real data content is:
   - plist
   - buffer
   - insertion type of both ends
   - start & start_byte
   - end & end_byte
   - next (singly linked list of overlays).
   - start_next and end_next (singly linked list of markers).
   I.e. 9words plus 2 bits, 3words of which are for external linked lists.
*/
  {
    enum Lisp_Misc_Type type : 16;	/* = Lisp_Misc_Overlay */
    unsigned gcmarkbit : 1;
    int spacer : 15;
    struct Lisp_Overlay *next;
    Lisp_Object start, end, plist;
  };

/* Like Lisp_Objfwd except that value lives in a slot in the
   current kboard.  */
struct Lisp_Kboard_Objfwd
  {
    enum Lisp_Fwd_Type type;	/* = Lisp_Fwd_Kboard_Obj */
    int offset;
  };

/* Hold a C pointer for later use.
   This type of object is used in the arg to record_unwind_protect.  */
struct Lisp_Save_Value
  {
    enum Lisp_Misc_Type type : 16;	/* = Lisp_Misc_Save_Value */
    unsigned gcmarkbit : 1;
    int spacer : 14;
    /* If DOGC is set, POINTER is the address of a memory
       area containing INTEGER potential Lisp_Objects.  */
    unsigned int dogc : 1;
    void *pointer;
    int integer;
  };


/* A miscellaneous object, when it's on the free list.  */
struct Lisp_Free
  {
    enum Lisp_Misc_Type type : 16;	/* = Lisp_Misc_Free */
    unsigned gcmarkbit : 1;
    int spacer : 15;
    union Lisp_Misc *chain;
#ifdef USE_LSB_TAG
    /* Try to make sure that sizeof(Lisp_Misc) preserves TYPEBITS-alignment.
       This assumes that Lisp_Marker is the largest of the alternatives and
       that Lisp_Misc_Any has the same size as "Lisp_Free w/o padding".  */
    char padding[((((sizeof (struct Lisp_Marker) - 1) >> GCTYPEBITS) + 1)
		  << GCTYPEBITS) - sizeof (struct Lisp_Misc_Any)];
#endif
  };

/* To get the type field of a union Lisp_Misc, use XMISCTYPE.
   It uses one of these struct subtypes to get the type field.  */

union Lisp_Misc
  {
    struct Lisp_Misc_Any u_any;	   /* Supertype of all Misc types.  */
    struct Lisp_Free u_free;	   /* Includes padding to force alignment.  */
    struct Lisp_Marker u_marker;			 /* 5 */
    struct Lisp_Overlay u_overlay;			 /* 5 */
    struct Lisp_Save_Value u_save_value;		 /* 3 */
  };

union Lisp_Fwd
  {
    struct Lisp_Intfwd u_intfwd;			 /* 2 */
    struct Lisp_Boolfwd u_boolfwd;			 /* 2 */
    struct Lisp_Objfwd u_objfwd;			 /* 2 */
    struct Lisp_Buffer_Objfwd u_buffer_objfwd;		 /* 2 */
    struct Lisp_Kboard_Objfwd u_kboard_objfwd;		 /* 2 */
  };
\f
/* Lisp floating point type */
struct Lisp_Float
  {
    union
    {
#ifdef HIDE_LISP_IMPLEMENTATION
      double data_;
#else
      double data;
#endif
      struct Lisp_Float *chain;
    } u;
  };

#ifdef HIDE_LISP_IMPLEMENTATION
#define XFLOAT_DATA(f)	(0 ? XFLOAT (f)->u.data_ : XFLOAT (f)->u.data_)
#else
#define XFLOAT_DATA(f)	(0 ? XFLOAT (f)->u.data :  XFLOAT (f)->u.data)
/* This should be used only in alloc.c, which always disables
   HIDE_LISP_IMPLEMENTATION.  */
#define XFLOAT_INIT(f,n) (XFLOAT (f)->u.data = (n))
#endif

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

/* 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

/* Flag bits in a character.  These also get used in termhooks.h.
   Richard Stallman <rms@gnu.ai.mit.edu> thinks that MULE
   (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)

#define CHAR_MODIFIER_MASK \
  (CHAR_ALT | CHAR_SUPER | CHAR_HYPER  | CHAR_SHIFT | CHAR_CTL | CHAR_META)


/* Actually, the current Emacs uses 22 bits for the character value
   itself.  */
#define CHARACTERBITS 22

/* The maximum byte size consumed by push_key_description.
   All callers should assure that at least this size of memory is
   allocated at the place pointed by the second argument.

   There are 6 modifiers, each consumes 2 chars.
   The octal form of a character code consumes
   (1 + CHARACTERBITS / 3 + 1) chars (including backslash at the head).
   We need one more byte for string terminator `\0'.  */
#define KEY_DESCRIPTION_SIZE ((2 * 6) + 1 + (CHARACTERBITS / 3) + 1 + 1)

\f
/* The glyph datatype, used to represent characters on the display.
   It consists of a char code and a face id.  */

typedef struct {
  int ch;
  int face_id;
} GLYPH;

/* Return a glyph's character code.  */
#define GLYPH_CHAR(glyph) ((glyph).ch)

/* Return a glyph's face ID.  */
#define GLYPH_FACE(glyph) ((glyph).face_id)

#define SET_GLYPH_CHAR(glyph, char) ((glyph).ch = (char))
#define SET_GLYPH_FACE(glyph, face) ((glyph).face_id = (face))
#define SET_GLYPH(glyph, char, face) ((glyph).ch = (char), (glyph).face_id = (face))

/* Return 1 if GLYPH contains valid character code.  */
#define GLYPH_CHAR_VALID_P(glyph) CHAR_VALID_P (GLYPH_CHAR (glyph), 1)


/* Glyph Code from a display vector may either be an integer which
   encodes a char code in the lower CHARACTERBITS bits and a (very small)
   face-id in the upper bits, or it may be a cons (CHAR . FACE-ID).  */

#define GLYPH_CODE_CHAR(gc) \
  (CONSP (gc) ? XINT (XCAR (gc)) : INTEGERP (gc) ? (XINT (gc) & ((1 << CHARACTERBITS)-1)) : 0)

#define GLYPH_CODE_FACE(gc) \
  (CONSP (gc) ? XINT (XCDR (gc)) : INTEGERP (gc) ? (XINT (gc) >> CHARACTERBITS) : DEFAULT_FACE_ID)

/* Return 1 if glyph code from display vector contains valid character code.  */
#define GLYPH_CODE_CHAR_VALID_P(gc) CHAR_VALID_P (GLYPH_CODE_CHAR (gc), 1)

#define GLYPH_CODE_P(gc) ((CONSP (gc) && INTEGERP (XCAR (gc)) && INTEGERP (XCDR (gc))) || INTEGERP (gc))

/* Only called when GLYPH_CODE_P (gc) is true.  */
#define SET_GLYPH_FROM_GLYPH_CODE(glyph, gc)				\
  do									\
    {									\
      if (CONSP (gc))							\
	SET_GLYPH (glyph, XINT (XCAR (gc)), XINT (XCDR (gc)));		\
      else								\
	SET_GLYPH (glyph, (XINT (gc) & ((1 << CHARACTERBITS)-1)),	\
		   (XINT (gc) >> CHARACTERBITS));			\
    }									\
  while (0)

/* The ID of the mode line highlighting face.  */
#define GLYPH_MODE_LINE_FACE 1
\f
/* Structure to hold mouse highlight data.  This is here because other
   header files need it for defining struct x_output etc.  */
typedef struct {
  /* These variables describe the range of text currently shown in its
     mouse-face, together with the window they apply to.  As long as
     the mouse stays within this range, we need not redraw anything on
     its account.  Rows and columns are glyph matrix positions in
     MOUSE_FACE_WINDOW.  */
  int mouse_face_beg_row, mouse_face_beg_col;
  int mouse_face_beg_x, mouse_face_beg_y;
  int mouse_face_end_row, mouse_face_end_col;
  int mouse_face_end_x, mouse_face_end_y;
  int mouse_face_past_end;
  Lisp_Object mouse_face_window;
  int mouse_face_face_id;
  Lisp_Object mouse_face_overlay;

  /* 1 if a mouse motion event came and we didn't handle it right away because
     gc was in progress.  */
  int mouse_face_deferred_gc;

  /* FRAME and X, Y position of mouse when last checked for
     highlighting.  X and Y can be negative or out of range for the frame.  */
  struct frame *mouse_face_mouse_frame;
  int mouse_face_mouse_x, mouse_face_mouse_y;

  /* Nonzero means defer mouse-motion highlighting.  */
  int mouse_face_defer;

  /* Nonzero means that the mouse highlight should not be shown.  */
  int mouse_face_hidden;

  int mouse_face_image_state;
} Mouse_HLInfo;
\f
/* Data type checking */

#define NILP(x)  EQ (x, Qnil)

#define NUMBERP(x) (INTEGERP (x) || FLOATP (x))
#define NATNUMP(x) (INTEGERP (x) && XINT (x) >= 0)

#define INTEGERP(x) (LISP_INT_TAG_P (XTYPE ((x))))
#define SYMBOLP(x) (XTYPE ((x)) == Lisp_Symbol)
#define MISCP(x) (XTYPE ((x)) == Lisp_Misc)
#define VECTORLIKEP(x) (XTYPE ((x)) == Lisp_Vectorlike)
#define STRINGP(x) (XTYPE ((x)) == Lisp_String)
#define CONSP(x) (XTYPE ((x)) == Lisp_Cons)

#define FLOATP(x) (XTYPE ((x)) == Lisp_Float)
#define VECTORP(x)    (VECTORLIKEP (x) && !(XVECTOR_SIZE (x) & PSEUDOVECTOR_FLAG))
#define OVERLAYP(x) (MISCP (x) && XMISCTYPE (x) == Lisp_Misc_Overlay)
#define MARKERP(x) (MISCP (x) && XMISCTYPE (x) == Lisp_Misc_Marker)
#define SAVE_VALUEP(x) (MISCP (x) && XMISCTYPE (x) == Lisp_Misc_Save_Value)

#define INTFWDP(x) (XFWDTYPE (x) == Lisp_Fwd_Int)
#define BOOLFWDP(x) (XFWDTYPE (x) == Lisp_Fwd_Bool)
#define OBJFWDP(x) (XFWDTYPE (x) == Lisp_Fwd_Obj)
#define BUFFER_OBJFWDP(x) (XFWDTYPE (x) == Lisp_Fwd_Buffer_Obj)
#define KBOARD_OBJFWDP(x) (XFWDTYPE (x) == Lisp_Fwd_Kboard_Obj)

/* True if object X is a pseudovector whose code is CODE.  */
#define PSEUDOVECTORP(x, code)					\
  TYPED_PSEUDOVECTORP(x, vector_header, code)

/* True if object X, with internal type struct T *, is a pseudovector whose
   code is CODE.  */
#define TYPED_PSEUDOVECTORP(x, t, code)				\
  (VECTORLIKEP (x)						\
   && (((((struct t *) XPNTR (x))->size				\
	 & (PSEUDOVECTOR_FLAG | (code))))			\
       == (PSEUDOVECTOR_FLAG | (code))))

/* Test for specific pseudovector types.  */
#define WINDOW_CONFIGURATIONP(x) PSEUDOVECTORP (x, PVEC_WINDOW_CONFIGURATION)
#define PROCESSP(x) PSEUDOVECTORP (x, PVEC_PROCESS)
#define WINDOWP(x) PSEUDOVECTORP (x, PVEC_WINDOW)
#define TERMINALP(x) PSEUDOVECTORP (x, PVEC_TERMINAL)
#define SUBRP(x) TYPED_PSEUDOVECTORP (x, Lisp_Subr, PVEC_SUBR)
#define COMPILEDP(x) PSEUDOVECTORP (x, PVEC_COMPILED)
#define BUFFERP(x) PSEUDOVECTORP (x, PVEC_BUFFER)
#define CHAR_TABLE_P(x) PSEUDOVECTORP (x, PVEC_CHAR_TABLE)
#define SUB_CHAR_TABLE_P(x) PSEUDOVECTORP (x, PVEC_SUB_CHAR_TABLE)
#define BOOL_VECTOR_P(x) PSEUDOVECTORP (x, PVEC_BOOL_VECTOR)
#define FRAMEP(x) PSEUDOVECTORP (x, PVEC_FRAME)

/* Test for image (image . spec)  */
#define IMAGEP(x) (CONSP (x) && EQ (XCAR (x), Qimage))

/* Array types.  */

#define ARRAYP(x) \
  (VECTORP (x) || STRINGP (x) || CHAR_TABLE_P (x) || BOOL_VECTOR_P (x))
\f
#define CHECK_LIST(x) \
  CHECK_TYPE (CONSP (x) || NILP (x), Qlistp, x)

#define CHECK_LIST_CONS(x, y) \
  CHECK_TYPE (CONSP (x), Qlistp, y)

#define CHECK_LIST_END(x, y) \
  CHECK_TYPE (NILP (x), Qlistp, y)

#define CHECK_STRING(x) \
  CHECK_TYPE (STRINGP (x), Qstringp, x)

#define CHECK_STRING_CAR(x) \
  CHECK_TYPE (STRINGP (XCAR (x)), Qstringp, XCAR (x))

#define CHECK_CONS(x) \
  CHECK_TYPE (CONSP (x), Qconsp, x)

#define CHECK_SYMBOL(x) \
  CHECK_TYPE (SYMBOLP (x), Qsymbolp, x)

#define CHECK_CHAR_TABLE(x) \
  CHECK_TYPE (CHAR_TABLE_P (x), Qchar_table_p, x)

#define CHECK_VECTOR(x) \
  CHECK_TYPE (VECTORP (x), Qvectorp, x)

#define CHECK_VECTOR_OR_STRING(x) \
  CHECK_TYPE (VECTORP (x) || STRINGP (x), Qarrayp, x)

#define CHECK_ARRAY(x, Qxxxp) \
  CHECK_TYPE (ARRAYP (x), Qxxxp, x)

#define CHECK_VECTOR_OR_CHAR_TABLE(x) \
  CHECK_TYPE (VECTORP (x) || CHAR_TABLE_P (x), Qvector_or_char_table_p, x)

#define CHECK_BUFFER(x) \
  CHECK_TYPE (BUFFERP (x), Qbufferp, x)

#define CHECK_WINDOW(x) \
  CHECK_TYPE (WINDOWP (x), Qwindowp, x)

#define CHECK_WINDOW_CONFIGURATION(x) \
  CHECK_TYPE (WINDOW_CONFIGURATIONP (x), Qwindow_configuration_p, x)

/* 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 if the buffer,
   vchild, and hchild members are all nil.  */

#define CHECK_LIVE_WINDOW(x) \
  CHECK_TYPE (WINDOWP (x) && !NILP (XWINDOW (x)->buffer), Qwindow_live_p, x)

#define CHECK_PROCESS(x) \
  CHECK_TYPE (PROCESSP (x), Qprocessp, x)

#define CHECK_SUBR(x) \
  CHECK_TYPE (SUBRP (x), Qsubrp, x)

#define CHECK_NUMBER(x) \
  CHECK_TYPE (INTEGERP (x), Qintegerp, x)

#define CHECK_NATNUM(x) \
  CHECK_TYPE (NATNUMP (x), Qwholenump, x)

#define CHECK_MARKER(x) \
  CHECK_TYPE (MARKERP (x), Qmarkerp, x)

#define CHECK_NUMBER_COERCE_MARKER(x) \
  do { if (MARKERP ((x))) XSETFASTINT (x, marker_position (x)); \
    else CHECK_TYPE (INTEGERP (x), Qinteger_or_marker_p, x); } while (0)

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

#define CHECK_FLOAT(x) \
  CHECK_TYPE (FLOATP (x), Qfloatp, x)

#define CHECK_NUMBER_OR_FLOAT(x) \
  CHECK_TYPE (FLOATP (x) || INTEGERP (x), Qnumberp, x)

#define CHECK_NUMBER_OR_FLOAT_COERCE_MARKER(x) \
  do { if (MARKERP (x)) XSETFASTINT (x, marker_position (x)); \
    else CHECK_TYPE (INTEGERP (x) || FLOATP (x), Qnumber_or_marker_p, x); } while (0)

#define CHECK_OVERLAY(x) \
  CHECK_TYPE (OVERLAYP (x), Qoverlayp, x)

/* Since we can't assign directly to the CAR or CDR fields of a cons
   cell, use these when checking that those fields contain numbers.  */
#define CHECK_NUMBER_CAR(x) \
  do {					\
    Lisp_Object tmp = XCAR (x);		\
    CHECK_NUMBER (tmp);			\
    XSETCAR ((x), tmp);			\
  } while (0)

#define CHECK_NUMBER_CDR(x) \
  do {					\
    Lisp_Object tmp = XCDR (x);		\
    CHECK_NUMBER (tmp);			\
    XSETCDR ((x), tmp);			\
  } while (0)

#define CHECK_NATNUM_CAR(x) \
  do {					\
    Lisp_Object tmp = XCAR (x);		\
    CHECK_NATNUM (tmp);			\
    XSETCAR ((x), tmp);			\
  } while (0)

#define CHECK_NATNUM_CDR(x) \
  do {					\
    Lisp_Object tmp = XCDR (x);		\
    CHECK_NATNUM (tmp);			\
    XSETCDR ((x), tmp);			\
  } while (0)

/* Cast pointers to this type to compare them.  Some machines want int.  */
#define PNTR_COMPARISON_TYPE EMACS_UINT
\f
/* Define a built-in function for calling from Lisp.
 `lname' should be the name to give the function in Lisp,
    as a null-terminated C string.
 `fnname' should be the name of the function in C.
    By convention, it starts with F.
 `sname' should be the name for the C constant structure
    that records information on this function for internal use.
    By convention, it should be the same as `fnname' but with S instead of F.
    It's too bad that C macros can't compute this from `fnname'.
 `minargs' should be a number, the minimum number of arguments allowed.
 `maxargs' should be a number, the maximum number of arguments allowed,
    or else MANY or UNEVALLED.
    MANY means pass a vector of evaluated arguments,
	 in the form of an integer number-of-arguments
	 followed by the address of a vector of Lisp_Objects
	 which contains the argument values.
    UNEVALLED means pass the list of unevaluated arguments
 `intspec' says how interactive arguments are to be fetched.
    If the string starts with a `(', `intspec' is evaluated and the resulting
    list is the list of arguments.
    If it's a string that doesn't start with `(', the value should follow
    the one of the doc string for `interactive'.
    A null string means call interactively with no arguments.
 `doc' is documentation for the user.  */

/* This version of DEFUN declares a function prototype with the right
   arguments, so we can catch errors with maxargs at compile-time.  */
#define DEFUN(lname, fnname, sname, minargs, maxargs, intspec, doc) \
  Lisp_Object fnname DEFUN_ARGS_ ## maxargs ;				\
  static DECL_ALIGN (struct Lisp_Subr, sname) =				\
    { PVEC_SUBR | (sizeof (struct Lisp_Subr) / sizeof (EMACS_INT)),	\
      { .a ## maxargs = fnname },				\
      minargs, maxargs, lname, intspec, 0};				\
  Lisp_Object fnname

/* Note that the weird token-substitution semantics of ANSI C makes
   this work for MANY and UNEVALLED.  */
#define DEFUN_ARGS_MANY		(size_t, Lisp_Object *)
#define DEFUN_ARGS_UNEVALLED	(Lisp_Object)
#define DEFUN_ARGS_0	(void)
#define DEFUN_ARGS_1	(Lisp_Object)
#define DEFUN_ARGS_2	(Lisp_Object, Lisp_Object)
#define DEFUN_ARGS_3	(Lisp_Object, Lisp_Object, Lisp_Object)
#define DEFUN_ARGS_4	(Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object)
#define DEFUN_ARGS_5	(Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, \
			 Lisp_Object)
#define DEFUN_ARGS_6	(Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, \
			 Lisp_Object, Lisp_Object)
#define DEFUN_ARGS_7	(Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, \
			 Lisp_Object, Lisp_Object, Lisp_Object)
#define DEFUN_ARGS_8	(Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, \
			 Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object)

/* Non-zero if OBJ is a Lisp function.  */
#define FUNCTIONP(OBJ)					\
     ((CONSP (OBJ) && EQ (XCAR (OBJ), Qlambda))		\
      || (SYMBOLP (OBJ) && !NILP (Ffboundp (OBJ)))	\
      || COMPILEDP (OBJ)				\
      || SUBRP (OBJ))

/* defsubr (Sname);
   is how we define the symbol for function `name' at start-up time.  */
extern void defsubr (struct Lisp_Subr *);

#define MANY -2
#define UNEVALLED -1

extern void defvar_lisp (struct Lisp_Objfwd *, const char *, Lisp_Object *);
extern void defvar_lisp_nopro (struct Lisp_Objfwd *, const char *, Lisp_Object *);
extern void defvar_bool (struct Lisp_Boolfwd *, const char *, int *);
extern void defvar_int (struct Lisp_Intfwd *, const char *, EMACS_INT *);
extern void defvar_kboard (struct Lisp_Kboard_Objfwd *, const char *, int);

/* Macros we use to define forwarded Lisp variables.
   These are used in the syms_of_FILENAME functions.

   An ordinary (not in buffer_defaults, per-buffer, or per-keyboard)
   lisp variable is actually a field in `struct emacs_globals'.  The
   field's name begins with "f_", which is a convention enforced by
   these macros.  Each such global has a corresponding #define in
   globals.h; the plain name should be used in the code.

   E.g., the global "cons_cells_consed" is declared as "int
   f_cons_cells_consed" in globals.h, but there is a define:

      #define cons_cells_consed globals.f_cons_cells_consed

   All C code uses the `cons_cells_consed' name.  This is all done
   this way to support indirection for multi-threaded Emacs.  */

#define DEFVAR_LISP(lname, vname, doc)		\
  do {						\
    static struct Lisp_Objfwd o_fwd;		\
    defvar_lisp (&o_fwd, lname, &globals.f_ ## vname);		\
  } while (0)
#define DEFVAR_LISP_NOPRO(lname, vname, doc)	\
  do {						\
    static struct Lisp_Objfwd o_fwd;		\
    defvar_lisp_nopro (&o_fwd, lname, &globals.f_ ## vname);	\
  } while (0)
#define DEFVAR_BOOL(lname, vname, doc)		\
  do {						\
    static struct Lisp_Boolfwd b_fwd;		\
    defvar_bool (&b_fwd, lname, &globals.f_ ## vname);		\
  } while (0)
#define DEFVAR_INT(lname, vname, doc)		\
  do {						\
    static struct Lisp_Intfwd i_fwd;		\
    defvar_int (&i_fwd, lname, &globals.f_ ## vname);		\
  } while (0)

#define DEFVAR_BUFFER_DEFAULTS(lname, vname, doc)		\
  do {								\
    static struct Lisp_Objfwd o_fwd;				\
    defvar_lisp_nopro (&o_fwd, lname, &BVAR (&buffer_defaults, vname));	\
  } while (0)

#define DEFVAR_KBOARD(lname, vname, doc)			\
  do {								\
    static struct Lisp_Kboard_Objfwd ko_fwd;			\
    defvar_kboard (&ko_fwd,					\
		   lname,					\
		   (int)((char *)(&current_kboard->vname ## _)	\
			 - (char *)current_kboard));		\
  } while (0)


\f
/* Structure for recording Lisp call stack for backtrace purposes.  */

/* The special binding stack holds the outer values of variables while
   they are bound by a function application or a let form, stores the
   code to be executed for Lisp unwind-protect forms, and stores the C
   functions to be called for record_unwind_protect.

   If func is non-zero, undoing this binding applies func to old_value;
      This implements record_unwind_protect.

   Otherwise, the element is a variable binding.

   If the symbol field is a symbol, it is an ordinary variable binding.

   Otherwise, it should be a structure (SYMBOL WHERE . CURRENT-BUFFER),
   which means having bound a local value while CURRENT-BUFFER was active.
   If WHERE is nil this means we saw the default value when binding SYMBOL.
   WHERE being a buffer or frame means we saw a buffer-local or frame-local
   value.  Other values of WHERE mean an internal error.  */

typedef Lisp_Object (*specbinding_func) (Lisp_Object);

struct specbinding
  {
    Lisp_Object symbol, old_value;
    specbinding_func func;
    Lisp_Object unused;		/* Dividing by 16 is faster than by 12 */
  };

extern struct specbinding *specpdl;
extern struct specbinding *specpdl_ptr;
extern EMACS_INT specpdl_size;

#define SPECPDL_INDEX()	((int) (specpdl_ptr - specpdl))

/* Everything needed to describe an active condition case.  */
struct handler
  {
    /* The handler clauses and variable from the condition-case form.  */
    /* For a handler set up in Lisp code, this is always a list.
       For an internal handler set up by internal_condition_case*,
       this can instead be the symbol t or `error'.
       t: handle all conditions.
       error: handle all conditions, and errors can run the debugger
              or display a backtrace.  */
    Lisp_Object handler;
    Lisp_Object var;
    /* Fsignal stores here the condition-case clause that applies,
       and Fcondition_case thus knows which clause to run.  */
    Lisp_Object chosen_clause;

    /* Used to effect the longjump out to the handler.  */
    struct catchtag *tag;

    /* The next enclosing handler.  */
    struct handler *next;
  };

/* This structure helps implement the `catch' and `throw' control
   structure.  A struct catchtag contains all the information needed
   to restore the state of the interpreter after a non-local jump.

   Handlers for error conditions (represented by `struct handler'
   structures) just point to a catch tag to do the cleanup required
   for their jumps.

   catchtag structures are chained together in the C calling stack;
   the `next' member points to the next outer catchtag.

   A call like (throw TAG VAL) searches for a catchtag whose `tag'
   member is TAG, and then unbinds to it.  The `val' member is used to
   hold VAL while the stack is unwound; `val' is returned as the value
   of the catch form.

   All the other members are concerned with restoring the interpreter
   state.  */

struct catchtag
{
  Lisp_Object tag;
  Lisp_Object val;
  struct catchtag *next;
  struct gcpro *gcpro;
  jmp_buf jmp;
  struct backtrace *backlist;
  struct handler *handlerlist;
  int lisp_eval_depth;
  int pdlcount;
  int poll_suppress_count;
  int interrupt_input_blocked;
  struct byte_stack *byte_stack;
};

extern Lisp_Object memory_signal_data;

/* An address near the bottom of the stack.
   Tells GC how to save a copy of the stack.  */
extern char *stack_bottom;

/* Check quit-flag and quit if it is non-nil.
   Typing C-g does not directly cause a quit; it only sets Vquit_flag.
   So the program needs to do QUIT at times when it is safe to quit.
   Every loop that might run for a long time or might not exit
   ought to do QUIT at least once, at a safe place.
   Unless that is impossible, of course.
   But it is very desirable to avoid creating loops where QUIT is impossible.

   Exception: if you set immediate_quit to nonzero,
   then the handler that responds to the C-g does the quit itself.
   This is a good thing to do around a loop that has no side effects
   and (in particular) cannot call arbitrary Lisp code.  */

#ifdef SYNC_INPUT
extern void process_pending_signals (void);
extern int pending_signals;
#define ELSE_PENDING_SIGNALS				\
  else if (pending_signals)				\
    process_pending_signals ();
#else  /* not SYNC_INPUT */
#define ELSE_PENDING_SIGNALS
#endif	/* not SYNC_INPUT */

#define QUIT						\
  do {							\
    if (!NILP (Vquit_flag) && NILP (Vinhibit_quit))	\
      {							\
        Lisp_Object flag = Vquit_flag;			\
	Vquit_flag = Qnil;				\
	if (EQ (Vthrow_on_input, flag))			\
	  Fthrow (Vthrow_on_input, Qt);			\
	Fsignal (Qquit, Qnil);				\
      }							\
    ELSE_PENDING_SIGNALS				\
  } while (0)


/* Nonzero if ought to quit now.  */

#define QUITP (!NILP (Vquit_flag) && NILP (Vinhibit_quit))
\f
extern Lisp_Object Vascii_downcase_table;
extern Lisp_Object Vascii_canon_table;
\f
/* Number of bytes of structure consed since last GC.  */

extern int consing_since_gc;

extern EMACS_INT gc_relative_threshold;

extern EMACS_INT memory_full_cons_threshold;

/* Structure for recording stack slots that need marking.  */

/* This is a chain of structures, each of which points at a Lisp_Object
   variable whose value should be marked in garbage collection.
   Normally every link of the chain is an automatic variable of a function,
   and its `val' points to some argument or local variable of the function.
   On exit to the function, the chain is set back to the value it had on entry.
   This way, no link remains in the chain when the stack frame containing the
   link disappears.

   Every function that can call Feval must protect in this fashion all
   Lisp_Object variables whose contents will be used again.  */

extern struct gcpro *gcprolist;

struct gcpro
{
  struct gcpro *next;

  /* Address of first protected variable.  */
  volatile Lisp_Object *var;

  /* Number of consecutive protected variables.  */
  size_t nvars;

#ifdef DEBUG_GCPRO
  int level;
#endif
};

/* Values of GC_MARK_STACK during compilation:

   0	Use GCPRO as before
   1	Do the real thing, make GCPROs and UNGCPRO no-ops.
   2    Mark the stack, and check that everything GCPRO'd is
	marked.
   3	Mark using GCPRO's, mark stack last, and count how many
	dead objects are kept alive.  */


#define GC_USE_GCPROS_AS_BEFORE		0
#define GC_MAKE_GCPROS_NOOPS		1
#define GC_MARK_STACK_CHECK_GCPROS	2
#define GC_USE_GCPROS_CHECK_ZOMBIES	3

#ifndef GC_MARK_STACK
#define GC_MARK_STACK GC_USE_GCPROS_AS_BEFORE
#endif

/* Whether we do the stack marking manually.  */
#define BYTE_MARK_STACK !(GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS		\
			  || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS)


#define GCPRO1(var) \
  GCPRO1_VAR (var, gcpro)
#define GCPRO2(var1, var2) \
  GCPRO2_VAR (var1, var2, gcpro)
#define GCPRO3(var1, var2, var3) \
  GCPRO3_VAR (var1, var2, var3, gcpro)
#define GCPRO4(var1, var2, var3, var4) \
  GCPRO4_VAR (var1, var2, var3, var4, gcpro)
#define GCPRO5(var1, var2, var3, var4, var5) \
  GCPRO5_VAR (var1, var2, var3, var4, var5, gcpro)
#define GCPRO6(var1, var2, var3, var4, var5, var6) \
  GCPRO6_VAR (var1, var2, var3, var4, var5, var6, gcpro)
#define UNGCPRO UNGCPRO_VAR (gcpro)

#if GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS

/* Do something silly with gcproN vars just so gcc shuts up.  */
/* You get warnings from MIPSPro...  */

#define GCPRO1_VAR(var, gcpro) ((void) gcpro##1)
#define GCPRO2_VAR(var1, var2, gcpro) \
  ((void) gcpro##2, (void) gcpro##1)
#define GCPRO3_VAR(var1, var2, var3, gcpro) \
  ((void) gcpro##3, (void) gcpro##2, (void) gcpro##1)
#define GCPRO4_VAR(var1, var2, var3, var4, gcpro) \
  ((void) gcpro##4, (void) gcpro##3, (void) gcpro##2, (void) gcpro##1)
#define GCPRO5_VAR(var1, var2, var3, var4, var5, gcpro) \
  ((void) gcpro##5, (void) gcpro##4, (void) gcpro##3, (void) gcpro##2, \
   (void) gcpro##1)
#define GCPRO6_VAR(var1, var2, var3, var4, var5, var6, gcpro) \
  ((void) gcpro##6, (void) gcpro##5, (void) gcpro##4, (void) gcpro##3, \
   (void) gcpro##2, (void) gcpro##1)
#define UNGCPRO_VAR(gcpro) ((void) 0)

#else /* GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS */

#ifndef DEBUG_GCPRO

#define GCPRO1_VAR(var, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var; gcpro##1.nvars = 1; \
  gcprolist = &gcpro##1; }

#define GCPRO2_VAR(var1, var2, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcprolist = &gcpro##2; }

#define GCPRO3_VAR(var1, var2, var3, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcpro##3.next = &gcpro##2; gcpro##3.var = &var3; gcpro##3.nvars = 1; \
  gcprolist = &gcpro##3; }

#define GCPRO4_VAR(var1, var2, var3, var4, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcpro##3.next = &gcpro##2; gcpro##3.var = &var3; gcpro##3.nvars = 1; \
  gcpro##4.next = &gcpro##3; gcpro##4.var = &var4; gcpro##4.nvars = 1; \
  gcprolist = &gcpro##4; }

#define GCPRO5_VAR(var1, var2, var3, var4, var5, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcpro##3.next = &gcpro##2; gcpro##3.var = &var3; gcpro##3.nvars = 1; \
  gcpro##4.next = &gcpro##3; gcpro##4.var = &var4; gcpro##4.nvars = 1; \
  gcpro##5.next = &gcpro##4; gcpro##5.var = &var5; gcpro##5.nvars = 1; \
  gcprolist = &gcpro##5; }

#define GCPRO6_VAR(var1, var2, var3, var4, var5, var6, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcpro##3.next = &gcpro##2; gcpro##3.var = &var3; gcpro##3.nvars = 1; \
  gcpro##4.next = &gcpro##3; gcpro##4.var = &var4; gcpro##4.nvars = 1; \
  gcpro##5.next = &gcpro##4; gcpro##5.var = &var5; gcpro##5.nvars = 1; \
  gcpro##6.next = &gcpro##5; gcpro##6.var = &var6; gcpro##6.nvars = 1; \
  gcprolist = &gcpro##6; }

#define UNGCPRO_VAR(gcpro) (gcprolist = gcpro##1.next)

#else

extern int gcpro_level;

#define GCPRO1_VAR(var, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var; gcpro##1.nvars = 1; \
  gcpro##1.level = gcpro_level++; \
  gcprolist = &gcpro##1; }

#define GCPRO2_VAR(var1, var2, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##1.level = gcpro_level; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcpro##2.level = gcpro_level++; \
  gcprolist = &gcpro##2; }

#define GCPRO3_VAR(var1, var2, var3, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##1.level = gcpro_level; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcpro##3.next = &gcpro##2; gcpro##3.var = &var3; gcpro##3.nvars = 1; \
  gcpro##3.level = gcpro_level++; \
  gcprolist = &gcpro##3; }

#define GCPRO4_VAR(var1, var2, var3, var4, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##1.level = gcpro_level; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcpro##3.next = &gcpro##2; gcpro##3.var = &var3; gcpro##3.nvars = 1; \
  gcpro##4.next = &gcpro##3; gcpro##4.var = &var4; gcpro##4.nvars = 1; \
  gcpro##4.level = gcpro_level++; \
  gcprolist = &gcpro##4; }

#define GCPRO5_VAR(var1, var2, var3, var4, var5, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##1.level = gcpro_level; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcpro##3.next = &gcpro##2; gcpro##3.var = &var3; gcpro##3.nvars = 1; \
  gcpro##4.next = &gcpro##3; gcpro##4.var = &var4; gcpro##4.nvars = 1; \
  gcpro##5.next = &gcpro##4; gcpro##5.var = &var5; gcpro##5.nvars = 1; \
  gcpro##5.level = gcpro_level++; \
  gcprolist = &gcpro##5; }

#define GCPRO6_VAR(var1, var2, var3, var4, var5, var6, gcpro) \
 {gcpro##1.next = gcprolist; gcpro##1.var = &var1; gcpro##1.nvars = 1; \
  gcpro##1.level = gcpro_level; \
  gcpro##2.next = &gcpro##1; gcpro##2.var = &var2; gcpro##2.nvars = 1; \
  gcpro##3.next = &gcpro##2; gcpro##3.var = &var3; gcpro##3.nvars = 1; \
  gcpro##4.next = &gcpro##3; gcpro##4.var = &var4; gcpro##4.nvars = 1; \
  gcpro##5.next = &gcpro##4; gcpro##5.var = &var5; gcpro##5.nvars = 1; \
  gcpro##6.next = &gcpro##5; gcpro##6.var = &var6; gcpro##6.nvars = 1; \
  gcpro##6.level = gcpro_level++; \
  gcprolist = &gcpro##6; }

#define UNGCPRO_VAR(gcpro) \
 ((--gcpro_level != gcpro##1.level) \
  ? (abort (), 0) \
  : ((gcprolist = gcpro##1.next), 0))

#endif /* DEBUG_GCPRO */
#endif /* GC_MARK_STACK != GC_MAKE_GCPROS_NOOPS */


/* Evaluate expr, UNGCPRO, and then return the value of expr.  */
#define RETURN_UNGCPRO(expr)			\
do						\
    {						\
      Lisp_Object ret_ungc_val;			\
      ret_ungc_val = (expr);			\
      UNGCPRO;					\
      return ret_ungc_val;			\
    }						\
while (0)

/* Call staticpro (&var) to protect static variable `var'.  */

void staticpro (Lisp_Object *);
\f
/* Declare a Lisp-callable function.  The MAXARGS parameter has the same
   meaning as in the DEFUN macro, and is used to construct a prototype.  */
/* We can use the same trick as in the DEFUN macro to generate the
   appropriate prototype.  */
#define EXFUN(fnname, maxargs) \
  extern Lisp_Object fnname DEFUN_ARGS_ ## maxargs

/* Forward declarations for prototypes.  */
struct window;
struct frame;

/* Defined in data.c.  */
extern Lisp_Object Qnil, Qt, Qquote, Qlambda, Qunbound;
extern Lisp_Object Qerror_conditions, Qerror_message, Qtop_level;
extern Lisp_Object Qerror, Qquit, Qargs_out_of_range;
extern Lisp_Object Qvoid_variable, Qvoid_function;
extern Lisp_Object Qinvalid_read_syntax;
extern Lisp_Object Qinvalid_function, Qwrong_number_of_arguments, Qno_catch;
extern Lisp_Object Qend_of_file, Qarith_error, Qmark_inactive;
extern Lisp_Object Qbeginning_of_buffer, Qend_of_buffer, Qbuffer_read_only;
extern Lisp_Object Qtext_read_only;
extern Lisp_Object Qinteractive_form;
extern Lisp_Object Qcircular_list;
extern Lisp_Object Qintegerp, Qwholenump, Qsymbolp, Qlistp, Qconsp;
extern Lisp_Object Qstringp, Qarrayp, Qsequencep, Qbufferp;
extern Lisp_Object Qchar_or_string_p, Qmarkerp, Qinteger_or_marker_p, Qvectorp;
extern Lisp_Object Qbuffer_or_string_p;
extern Lisp_Object Qfboundp;
extern Lisp_Object Qchar_table_p, Qvector_or_char_table_p;

extern Lisp_Object Qcdr;

extern Lisp_Object Qrange_error, Qdomain_error, Qsingularity_error;
extern Lisp_Object Qoverflow_error, Qunderflow_error;

extern Lisp_Object Qfloatp;
extern Lisp_Object Qnumberp, Qnumber_or_marker_p;

extern Lisp_Object Qinteger;

extern Lisp_Object Qfont_spec, Qfont_entity, Qfont_object;

EXFUN (Finteractive_form, 1);
EXFUN (Fbyteorder, 0);

/* Defined in frame.c */
extern Lisp_Object Qframep;

/* Defined in data.c */
EXFUN (Fcar, 1);
EXFUN (Fcar_safe, 1);
EXFUN (Fcdr, 1);
EXFUN (Fcdr_safe, 1);
EXFUN (Fsetcar, 2);
EXFUN (Fsetcdr, 2);
EXFUN (Fboundp, 1);
EXFUN (Ffboundp, 1);
EXFUN (Fsymbol_function, 1);
EXFUN (Fsymbol_name, 1);
extern Lisp_Object indirect_function (Lisp_Object);
EXFUN (Findirect_function, 2);
EXFUN (Ffset, 2);
EXFUN (Fsymbol_value, 1);
extern Lisp_Object find_symbol_value (Lisp_Object);
EXFUN (Fset, 2);
EXFUN (Fdefault_value, 1);
EXFUN (Fset_default, 2);
EXFUN (Fdefault_boundp, 1);
EXFUN (Fmake_local_variable, 1);
EXFUN (Flocal_variable_p, 2);

EXFUN (Faref, 2);
EXFUN (Faset, 3);

EXFUN (Fstring_to_number, 2);
EXFUN (Fnumber_to_string, 1);
EXFUN (Fgtr, 2);
EXFUN (Flss, 2);
EXFUN (Fgeq, 2);
EXFUN (Fleq, 2);
EXFUN (Fzerop, 1);
EXFUN (Fplus, MANY);
EXFUN (Fminus, MANY);
EXFUN (Ftimes, MANY);
EXFUN (Fquo, MANY);
EXFUN (Frem, 2);
EXFUN (Fmax, MANY);
EXFUN (Fmin, MANY);

EXFUN (Fadd1, 1);
EXFUN (Fsub1, 1);
EXFUN (Fmake_variable_buffer_local, 1);

extern struct Lisp_Symbol *indirect_variable (struct Lisp_Symbol *);
extern Lisp_Object long_to_cons (unsigned long);
extern unsigned long cons_to_long (Lisp_Object);
extern void args_out_of_range (Lisp_Object, Lisp_Object) NO_RETURN;
extern void args_out_of_range_3 (Lisp_Object, Lisp_Object,
                                 Lisp_Object) NO_RETURN;
extern Lisp_Object wrong_type_argument (Lisp_Object, Lisp_Object) NO_RETURN;
extern Lisp_Object do_symval_forwarding (union Lisp_Fwd *);
extern void set_internal (Lisp_Object, Lisp_Object, Lisp_Object, int);
extern void syms_of_data (void);
extern void init_data (void);
extern void swap_in_global_binding (struct Lisp_Symbol *);

/* Defined in cmds.c */
EXFUN (Fend_of_line, 1);
EXFUN (Fforward_char, 1);
EXFUN (Fforward_line, 1);
extern void syms_of_cmds (void);
extern void keys_of_cmds (void);

/* Defined in coding.c */
extern Lisp_Object Qcharset;
EXFUN (Fcoding_system_p, 1);
EXFUN (Fcoding_system_base, 1);
EXFUN (Fcoding_system_eol_type, 1);
EXFUN (Fcheck_coding_system, 1);
EXFUN (Fread_coding_system, 2);
EXFUN (Fread_non_nil_coding_system, 1);
EXFUN (Ffind_operation_coding_system, MANY);
EXFUN (Fdecode_coding_string, 4);
extern Lisp_Object detect_coding_system (const unsigned char *, EMACS_INT,
                                         EMACS_INT, int, int, Lisp_Object);
extern void init_coding (void);
extern void init_coding_once (void);
extern void syms_of_coding (void);

/* Defined in character.c */
EXFUN (Fchar_width, 1);
EXFUN (Fstring, MANY);
extern EMACS_INT chars_in_text (const unsigned char *, EMACS_INT);
extern EMACS_INT multibyte_chars_in_text (const unsigned char *, EMACS_INT);
extern int multibyte_char_to_unibyte (int);
extern int multibyte_char_to_unibyte_safe (int);
extern void init_character_once (void);
extern void syms_of_character (void);

/* Defined in charset.c */
extern void init_charset (void);
extern void init_charset_once (void);
extern void syms_of_charset (void);
/* Structure forward declarations.  */
struct charset;

/* Defined in composite.c */
extern void syms_of_composite (void);

/* Defined in syntax.c */
EXFUN (Fforward_word, 1);
EXFUN (Fskip_chars_forward, 2);
EXFUN (Fskip_chars_backward, 2);
extern void init_syntax_once (void);
extern void syms_of_syntax (void);

/* Defined in fns.c */
extern Lisp_Object QCrehash_size, QCrehash_threshold;
extern int next_almost_prime (int);
extern Lisp_Object larger_vector (Lisp_Object, int, Lisp_Object);
extern void sweep_weak_hash_tables (void);
extern Lisp_Object Qcursor_in_echo_area;
extern Lisp_Object Qstring_lessp;
extern Lisp_Object QCsize, QCtest, QCweakness, Qequal, Qeq, Qeql;
unsigned sxhash (Lisp_Object, int);
Lisp_Object make_hash_table (Lisp_Object, Lisp_Object, Lisp_Object,
                             Lisp_Object, Lisp_Object, Lisp_Object,
                             Lisp_Object);
int hash_lookup (struct Lisp_Hash_Table *, Lisp_Object, unsigned *);
int hash_put (struct Lisp_Hash_Table *, Lisp_Object, Lisp_Object,
              unsigned);
void init_weak_hash_tables (void);
extern void init_fns (void);
EXFUN (Fmake_hash_table, MANY);
EXFUN (Fgethash, 3);
EXFUN (Fputhash, 3);
EXFUN (Fremhash, 2);

EXFUN (Fidentity, 1);
EXFUN (Flength, 1);
EXFUN (Fappend, MANY);
EXFUN (Fconcat, MANY);
EXFUN (Fvconcat, MANY);
EXFUN (Fcopy_sequence, 1);
EXFUN (Fstring_make_multibyte, 1);
EXFUN (Fstring_make_unibyte, 1);
EXFUN (Fstring_as_multibyte, 1);
EXFUN (Fstring_as_unibyte, 1);
EXFUN (Fstring_to_multibyte, 1);
EXFUN (Fsubstring, 3);
extern Lisp_Object substring_both (Lisp_Object, EMACS_INT, EMACS_INT,
				   EMACS_INT, EMACS_INT);
EXFUN (Fnth, 2);
EXFUN (Fnthcdr, 2);
EXFUN (Fmemq, 2);
EXFUN (Fassq, 2);
EXFUN (Fassoc, 2);
EXFUN (Felt, 2);
EXFUN (Fmember, 2);
EXFUN (Frassq, 2);
EXFUN (Fdelq, 2);
EXFUN (Fdelete, 2);
EXFUN (Fsort, 2);
EXFUN (Freverse, 1);
EXFUN (Fnreverse, 1);
EXFUN (Fget, 2);
EXFUN (Fput, 3);
EXFUN (Fequal, 2);
EXFUN (Fnconc, MANY);
EXFUN (Fmapcar, 2);
EXFUN (Fmapconcat, 3);
extern Lisp_Object do_yes_or_no_p (Lisp_Object);
EXFUN (Fprovide, 2);
extern Lisp_Object concat2 (Lisp_Object, Lisp_Object);
extern Lisp_Object concat3 (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object nconc2 (Lisp_Object, Lisp_Object);
extern Lisp_Object assq_no_quit (Lisp_Object, Lisp_Object);
extern Lisp_Object assoc_no_quit (Lisp_Object, Lisp_Object);
extern void clear_string_char_byte_cache (void);
extern EMACS_INT string_char_to_byte (Lisp_Object, EMACS_INT);
extern EMACS_INT string_byte_to_char (Lisp_Object, EMACS_INT);
extern Lisp_Object string_to_multibyte (Lisp_Object);
extern Lisp_Object string_make_unibyte (Lisp_Object);
EXFUN (Fcopy_alist, 1);
EXFUN (Fplist_get, 2);
EXFUN (Fplist_put, 3);
EXFUN (Fplist_member, 2);
EXFUN (Frassoc, 2);
EXFUN (Fstring_equal, 2);
EXFUN (Fcompare_strings, 7);
EXFUN (Fstring_lessp, 2);
extern void syms_of_fns (void);

/* Defined in floatfns.c */
extern double extract_float (Lisp_Object);
EXFUN (Ffloat, 1);
EXFUN (Ftruncate, 2);
extern void init_floatfns (void);
extern void syms_of_floatfns (void);
extern Lisp_Object fmod_float (Lisp_Object x, Lisp_Object y);

/* Defined in fringe.c */
extern void syms_of_fringe (void);
extern void init_fringe (void);
#ifdef HAVE_WINDOW_SYSTEM
extern void mark_fringe_data (void);
extern void init_fringe_once (void);
#endif /* HAVE_WINDOW_SYSTEM */

/* Defined in image.c */
extern Lisp_Object QCascent, QCmargin, QCrelief;
extern Lisp_Object QCconversion;
extern int x_bitmap_mask (struct frame *, int);
extern void syms_of_image (void);
extern void init_image (void);

/* Defined in insdel.c */
extern Lisp_Object Qinhibit_modification_hooks;
extern void move_gap (EMACS_INT);
extern void move_gap_both (EMACS_INT, EMACS_INT);
extern void make_gap (EMACS_INT);
extern EMACS_INT copy_text (const unsigned char *, unsigned char *,
			    EMACS_INT, int, int);
extern EMACS_INT count_size_as_multibyte (const unsigned char *, EMACS_INT);
extern int count_combining_before (const unsigned char *,
				   EMACS_INT, EMACS_INT, EMACS_INT);
extern int count_combining_after (const unsigned char *,
				  EMACS_INT, EMACS_INT, EMACS_INT);
extern void insert (const char *, EMACS_INT);
extern void insert_and_inherit (const char *, EMACS_INT);
extern void insert_1 (const char *, EMACS_INT, int, int, int);
extern void insert_1_both (const char *, EMACS_INT, EMACS_INT,
			   int, int, int);
extern void insert_from_gap (EMACS_INT, EMACS_INT);
extern void insert_from_string (Lisp_Object, EMACS_INT, EMACS_INT,
				EMACS_INT, EMACS_INT, int);
extern void insert_from_buffer (struct buffer *, EMACS_INT, EMACS_INT, int);
extern void insert_char (int);
extern void insert_string (const char *);
extern void insert_before_markers (const char *, EMACS_INT);
extern void insert_before_markers_and_inherit (const char *, EMACS_INT);
extern void insert_from_string_before_markers (Lisp_Object, EMACS_INT,
					       EMACS_INT, EMACS_INT,
					       EMACS_INT, int);
extern void del_range (EMACS_INT, EMACS_INT);
extern Lisp_Object del_range_1 (EMACS_INT, EMACS_INT, int, int);
extern void del_range_byte (EMACS_INT, EMACS_INT, int);
extern void del_range_both (EMACS_INT, EMACS_INT, EMACS_INT, EMACS_INT, int);
extern Lisp_Object del_range_2 (EMACS_INT, EMACS_INT,
				EMACS_INT, EMACS_INT, int);
extern void modify_region (struct buffer *, EMACS_INT, EMACS_INT, int);
extern void prepare_to_modify_buffer (EMACS_INT, EMACS_INT, EMACS_INT *);
extern void signal_after_change (EMACS_INT, EMACS_INT, EMACS_INT);
extern void adjust_after_insert (EMACS_INT, EMACS_INT, EMACS_INT,
				 EMACS_INT, EMACS_INT);
extern void adjust_markers_for_delete (EMACS_INT, EMACS_INT,
				       EMACS_INT, EMACS_INT);
extern void replace_range (EMACS_INT, EMACS_INT, Lisp_Object, int, int, int);
extern void replace_range_2 (EMACS_INT, EMACS_INT, EMACS_INT, EMACS_INT,
			     const char *, EMACS_INT, EMACS_INT, int);
extern void syms_of_insdel (void);

/* Defined in dispnew.c */
extern Lisp_Object selected_frame;
extern Lisp_Object Vwindow_system;
EXFUN (Fding, 1);
EXFUN (Fredraw_frame, 1);
EXFUN (Fsleep_for, 2);
EXFUN (Fredisplay, 1);
extern Lisp_Object sit_for (Lisp_Object, int, int);
extern void init_display (void);
extern void syms_of_display (void);

/* Defined in xdisp.c */
extern Lisp_Object Qinhibit_point_motion_hooks;
extern Lisp_Object Qinhibit_redisplay, Qdisplay;
extern Lisp_Object Qmenu_bar_update_hook;
extern Lisp_Object Qwindow_scroll_functions;
extern Lisp_Object Qoverriding_local_map, Qoverriding_terminal_local_map;
extern Lisp_Object Qimage, Qtext, Qboth, Qboth_horiz, Qtext_image_horiz;
extern Lisp_Object Qspace, Qcenter, QCalign_to;
extern Lisp_Object Qbar, Qhbar, Qbox, Qhollow;
extern Lisp_Object Qleft_margin, Qright_margin;
extern Lisp_Object Qglyphless_char;
extern Lisp_Object QCdata, QCfile;
extern Lisp_Object QCmap;
extern Lisp_Object Qrisky_local_variable;
extern struct frame *last_glyphless_glyph_frame;
extern unsigned last_glyphless_glyph_face_id;
extern int last_glyphless_glyph_merged_face_id;
extern int noninteractive_need_newline;
extern Lisp_Object echo_area_buffer[2];
extern void add_to_log (const char *, Lisp_Object, Lisp_Object);
extern void check_message_stack (void);
extern void setup_echo_area_for_printing (int);
extern int push_message (void);
extern Lisp_Object pop_message_unwind (Lisp_Object);
extern Lisp_Object restore_message_unwind (Lisp_Object);
extern void restore_message (void);
extern Lisp_Object current_message (void);
extern void clear_message (int, int);
extern void message (const char *, ...) ATTRIBUTE_FORMAT_PRINTF (1, 2);
extern void message1 (const char *);
extern void message1_nolog (const char *);
extern void message2 (const char *, EMACS_INT, int);
extern void message2_nolog (const char *, EMACS_INT, int);
extern void message3 (Lisp_Object, EMACS_INT, int);
extern void message3_nolog (Lisp_Object, EMACS_INT, int);
extern void message_dolog (const char *, EMACS_INT, int, int);
extern void message_with_string (const char *, Lisp_Object, int);
extern void message_log_maybe_newline (void);
extern void update_echo_area (void);
extern void truncate_echo_area (EMACS_INT);
extern void redisplay (void);
extern void redisplay_preserve_echo_area (int);
extern void prepare_menu_bars (void);

void set_frame_cursor_types (struct frame *, Lisp_Object);
extern void syms_of_xdisp (void);
extern void init_xdisp (void);
extern Lisp_Object safe_eval (Lisp_Object);
extern int pos_visible_p (struct window *, EMACS_INT, int *,
                          int *, int *, int *, int *, int *);

/* Defined in xsettings.c */
extern void syms_of_xsettings (void);

/* Defined in vm-limit.c.  */
extern void memory_warnings (POINTER_TYPE *, void (*warnfun) (const char *));

/* Defined in alloc.c */
extern void check_pure_size (void);
extern void allocate_string_data (struct Lisp_String *, EMACS_INT, EMACS_INT);
extern void reset_malloc_hooks (void);
extern void uninterrupt_malloc (void);
extern void malloc_warning (const char *);
extern void memory_full (void) NO_RETURN;
extern void buffer_memory_full (void) NO_RETURN;
extern int survives_gc_p (Lisp_Object);
extern void mark_object (Lisp_Object);
#if defined REL_ALLOC && !defined SYSTEM_MALLOC
extern void refill_memory_reserve (void);
#endif
extern const char *pending_malloc_warning;
extern Lisp_Object *stack_base;
EXFUN (Fcons, 2);
extern Lisp_Object list1 (Lisp_Object);
extern Lisp_Object list2 (Lisp_Object, Lisp_Object);
extern Lisp_Object list3 (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object list4 (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object list5 (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object,
			  Lisp_Object);
EXFUN (Flist, MANY);
EXFUN (Fmake_list, 2);
extern Lisp_Object allocate_misc (void);
EXFUN (Fmake_vector, 2);
EXFUN (Fvector, MANY);
EXFUN (Fmake_symbol, 1);
EXFUN (Fmake_marker, 0);
EXFUN (Fmake_string, 2);
extern Lisp_Object build_string (const char *);
extern Lisp_Object make_string (const char *, EMACS_INT);
extern Lisp_Object make_unibyte_string (const char *, EMACS_INT);
extern Lisp_Object make_multibyte_string (const char *, EMACS_INT, EMACS_INT);
extern Lisp_Object make_event_array (int, Lisp_Object *);
extern Lisp_Object make_uninit_string (EMACS_INT);
extern Lisp_Object make_uninit_multibyte_string (EMACS_INT, EMACS_INT);
extern Lisp_Object make_string_from_bytes (const char *, EMACS_INT, EMACS_INT);
extern Lisp_Object make_specified_string (const char *,
					  EMACS_INT, EMACS_INT, int);
EXFUN (Fpurecopy, 1);
extern Lisp_Object make_pure_string (const char *, EMACS_INT, EMACS_INT, int);
extern Lisp_Object make_pure_c_string (const char *data);
extern Lisp_Object pure_cons (Lisp_Object, Lisp_Object);
extern Lisp_Object make_pure_vector (EMACS_INT);
EXFUN (Fgarbage_collect, 0);
EXFUN (Fmake_byte_code, MANY);
EXFUN (Fmake_bool_vector, 2);
extern Lisp_Object Qchar_table_extra_slots;
extern struct Lisp_Vector *allocate_vector (EMACS_INT);
extern struct Lisp_Vector *allocate_pseudovector (int memlen, int lisplen, EMACS_INT tag);
#define ALLOCATE_PSEUDOVECTOR(typ,field,tag)				\
  ((typ*)								\
   allocate_pseudovector						\
       (VECSIZE (typ), PSEUDOVECSIZE (typ, field), tag))
extern struct Lisp_Hash_Table *allocate_hash_table (void);
extern struct window *allocate_window (void);
extern struct frame *allocate_frame (void);
extern struct Lisp_Process *allocate_process (void);
extern struct terminal *allocate_terminal (void);
extern int gc_in_progress;
extern int abort_on_gc;
extern Lisp_Object make_float (double);
extern void display_malloc_warning (void);
extern int inhibit_garbage_collection (void);
extern Lisp_Object make_save_value (void *, int);
extern void free_marker (Lisp_Object);
extern void free_cons (struct Lisp_Cons *);
extern void init_alloc_once (void);
extern void init_alloc (void);
extern void syms_of_alloc (void);
extern struct buffer * allocate_buffer (void);
extern int valid_lisp_object_p (Lisp_Object);

/* Defined in chartab.c */
EXFUN (Fmake_char_table, 2);
EXFUN (Fset_char_table_parent, 2);
EXFUN (Fchar_table_extra_slot, 2);
EXFUN (Fset_char_table_extra_slot, 3);
EXFUN (Fset_char_table_range, 3);
EXFUN (Foptimize_char_table, 2);
extern Lisp_Object copy_char_table (Lisp_Object);
extern Lisp_Object char_table_ref (Lisp_Object, int);
extern Lisp_Object char_table_ref_and_range (Lisp_Object, int,
                                             int *, int *);
extern Lisp_Object char_table_set (Lisp_Object, int, Lisp_Object);
extern Lisp_Object char_table_set_range (Lisp_Object, int, int,
                                         Lisp_Object);
extern int char_table_translate (Lisp_Object, int);
extern void map_char_table (void (*) (Lisp_Object, Lisp_Object,
                            Lisp_Object),
                            Lisp_Object, Lisp_Object, Lisp_Object);
extern void map_char_table_for_charset (void (*c_function) (Lisp_Object, Lisp_Object),
					Lisp_Object, Lisp_Object,
					Lisp_Object, struct charset *,
					unsigned, unsigned);
extern void syms_of_chartab (void);

/* Defined in print.c */
extern Lisp_Object Vprin1_to_string_buffer;
extern void debug_print (Lisp_Object) EXTERNALLY_VISIBLE;
EXFUN (Fprin1, 2);
EXFUN (Fprin1_to_string, 2);
EXFUN (Fterpri, 1);
EXFUN (Fprint, 2);
EXFUN (Ferror_message_string, 1);
extern Lisp_Object Qstandard_output;
extern Lisp_Object Qexternal_debugging_output;
extern void temp_output_buffer_setup (const char *);
extern int print_level;
extern Lisp_Object Qprint_escape_newlines;
extern void write_string (const char *, int);
extern void print_error_message (Lisp_Object, Lisp_Object, const char *,
				 Lisp_Object);
extern Lisp_Object internal_with_output_to_temp_buffer
        (const char *, Lisp_Object (*) (Lisp_Object), Lisp_Object);
#define FLOAT_TO_STRING_BUFSIZE 350
extern void float_to_string (char *, double);
extern void syms_of_print (void);

/* Defined in lread.c.  */
extern Lisp_Object Qvariable_documentation, Qstandard_input;
extern Lisp_Object Qbackquote, Qcomma, Qcomma_at, Qcomma_dot, Qfunction;
EXFUN (Fread, 1);
EXFUN (Fread_from_string, 3);
EXFUN (Fintern, 2);
EXFUN (Fintern_soft, 2);
EXFUN (Funintern, 2);
EXFUN (Fload, 5);
EXFUN (Fget_load_suffixes, 0);
EXFUN (Fread_char, 3);
EXFUN (Fread_event, 3);
extern Lisp_Object check_obarray (Lisp_Object);
extern Lisp_Object intern (const char *);
extern Lisp_Object intern_c_string (const char *);
extern Lisp_Object oblookup (Lisp_Object, const char *, EMACS_INT, EMACS_INT);
#define LOADHIST_ATTACH(x) \
  do {									\
    if (initialized) Vcurrent_load_list = Fcons (x, Vcurrent_load_list); \
  } while (0)
extern int openp (Lisp_Object, Lisp_Object, Lisp_Object,
                  Lisp_Object *, Lisp_Object);
Lisp_Object string_to_number (char const *, int, int);
extern void map_obarray (Lisp_Object, void (*) (Lisp_Object, Lisp_Object),
                         Lisp_Object);
extern void dir_warning (const char *, Lisp_Object);
extern void close_load_descs (void);
extern void init_obarray (void);
extern void init_lread (void);
extern void syms_of_lread (void);

/* Defined in eval.c.  */
extern Lisp_Object Qautoload, Qexit, Qinteractive, Qcommandp, Qdefun, Qmacro;
extern Lisp_Object Qinhibit_quit, Qclosure;
extern Lisp_Object Qand_rest;
extern Lisp_Object Vautoload_queue;
extern Lisp_Object Vsignaling_function;
extern int handling_signal;
#if BYTE_MARK_STACK
extern struct catchtag *catchlist;
extern struct handler *handlerlist;
#endif
/* To run a normal hook, use the appropriate function from the list below.
   The calling convention:

   if (!NILP (Vrun_hooks))
     call1 (Vrun_hooks, Qmy_funny_hook);

   should no longer be used.  */
extern Lisp_Object Vrun_hooks;
EXFUN (Frun_hooks, MANY);
EXFUN (Frun_hook_with_args, MANY);
EXFUN (Frun_hook_with_args_until_failure, MANY);
extern void run_hook_with_args_2 (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object run_hook_with_args (size_t nargs, Lisp_Object *args,
				       Lisp_Object (*funcall)
				       (size_t nargs, Lisp_Object *args));
EXFUN (Fprogn, UNEVALLED);
EXFUN (Finteractive_p, 0);
EXFUN (Fthrow, 2) NO_RETURN;
EXFUN (Fsignal, 2);
extern void xsignal (Lisp_Object, Lisp_Object) NO_RETURN;
extern void xsignal0 (Lisp_Object) NO_RETURN;
extern void xsignal1 (Lisp_Object, Lisp_Object) NO_RETURN;
extern void xsignal2 (Lisp_Object, Lisp_Object, Lisp_Object) NO_RETURN;
extern void xsignal3 (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object) NO_RETURN;
extern void signal_error (const char *, Lisp_Object) NO_RETURN;
EXFUN (Fcommandp, 2);
EXFUN (Ffunctionp, 1);
EXFUN (Feval, 2);
extern Lisp_Object eval_sub (Lisp_Object form);
EXFUN (Fapply, MANY);
EXFUN (Ffuncall, MANY);
extern Lisp_Object apply1 (Lisp_Object, Lisp_Object);
extern Lisp_Object call0 (Lisp_Object);
extern Lisp_Object call1 (Lisp_Object, Lisp_Object);
extern Lisp_Object call2 (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object call3 (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object call4 (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object call5 (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object call6 (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object call7 (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
EXFUN (Fdo_auto_save, 2);
extern Lisp_Object internal_catch (Lisp_Object, Lisp_Object (*) (Lisp_Object), Lisp_Object);
extern Lisp_Object internal_lisp_condition_case (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object internal_condition_case (Lisp_Object (*) (void), Lisp_Object, Lisp_Object (*) (Lisp_Object));
extern Lisp_Object internal_condition_case_1 (Lisp_Object (*) (Lisp_Object), Lisp_Object, Lisp_Object, Lisp_Object (*) (Lisp_Object));
extern Lisp_Object internal_condition_case_2 (Lisp_Object (*) (Lisp_Object, Lisp_Object), Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object (*) (Lisp_Object));
extern Lisp_Object internal_condition_case_n (Lisp_Object (*) (size_t, Lisp_Object *), size_t, Lisp_Object *, Lisp_Object, Lisp_Object (*) (Lisp_Object));
extern void specbind (Lisp_Object, Lisp_Object);
extern void record_unwind_protect (Lisp_Object (*) (Lisp_Object), Lisp_Object);
extern Lisp_Object unbind_to (int, Lisp_Object);
extern void error (const char *, ...) NO_RETURN ATTRIBUTE_FORMAT_PRINTF (1, 2);
extern void verror (const char *, va_list)
  NO_RETURN ATTRIBUTE_FORMAT_PRINTF (1, 0);
extern void do_autoload (Lisp_Object, Lisp_Object);
extern Lisp_Object un_autoload (Lisp_Object);
extern void init_eval_once (void);
extern Lisp_Object safe_call (size_t, Lisp_Object *);
extern Lisp_Object safe_call1 (Lisp_Object, Lisp_Object);
extern Lisp_Object safe_call2 (Lisp_Object, Lisp_Object, Lisp_Object);
extern void init_eval (void);
#if BYTE_MARK_STACK
extern void mark_backtrace (void);
#endif
extern void syms_of_eval (void);

/* Defined in editfns.c */
extern Lisp_Object Qfield;
EXFUN (Fcurrent_message, 0);
EXFUN (Fgoto_char, 1);
EXFUN (Fpoint_max_marker, 0);
EXFUN (Fpoint, 0);
EXFUN (Fpoint_marker, 0);
EXFUN (Fline_beginning_position, 1);
EXFUN (Fline_end_position, 1);
EXFUN (Ffollowing_char, 0);
EXFUN (Fprevious_char, 0);
EXFUN (Fchar_after, 1);
EXFUN (Finsert, MANY);
EXFUN (Finsert_char, 3);
extern void insert1 (Lisp_Object);
EXFUN (Feolp, 0);
EXFUN (Feobp, 0);
EXFUN (Fbolp, 0);
EXFUN (Fbobp, 0);
EXFUN (Fformat, MANY);
EXFUN (Fmessage, MANY);
extern Lisp_Object format2 (const char *, Lisp_Object, Lisp_Object);
EXFUN (Fbuffer_substring, 2);
EXFUN (Fbuffer_string, 0);
extern Lisp_Object save_excursion_save (void);
extern Lisp_Object save_restriction_save (void);
extern Lisp_Object save_excursion_restore (Lisp_Object);
extern Lisp_Object save_restriction_restore (Lisp_Object);
EXFUN (Fchar_to_string, 1);
EXFUN (Fdelete_region, 2);
EXFUN (Fnarrow_to_region, 2);
EXFUN (Fwiden, 0);
EXFUN (Fuser_login_name, 1);
EXFUN (Fsystem_name, 0);
EXFUN (Fcurrent_time, 0);
EXFUN (Fget_internal_run_time, 0);
extern EMACS_INT clip_to_bounds (EMACS_INT, EMACS_INT, EMACS_INT);
extern Lisp_Object make_buffer_string (EMACS_INT, EMACS_INT, int);
extern Lisp_Object make_buffer_string_both (EMACS_INT, EMACS_INT, EMACS_INT,
					    EMACS_INT, int);
extern void init_editfns (void);
const char *get_system_name (void);
extern void syms_of_editfns (void);
EXFUN (Fconstrain_to_field, 5);
EXFUN (Ffield_end, 3);
extern void set_time_zone_rule (const char *);

/* Defined in buffer.c */
extern int mouse_face_overlay_overlaps (Lisp_Object);
extern void nsberror (Lisp_Object) NO_RETURN;
EXFUN (Fset_buffer_multibyte, 1);
EXFUN (Foverlay_start, 1);
EXFUN (Foverlay_end, 1);
extern void adjust_overlays_for_insert (EMACS_INT, EMACS_INT);
extern void adjust_overlays_for_delete (EMACS_INT, EMACS_INT);
extern void fix_start_end_in_overlays (EMACS_INT, EMACS_INT);
extern void report_overlay_modification (Lisp_Object, Lisp_Object, int,
                                         Lisp_Object, Lisp_Object, Lisp_Object);
extern int overlay_touches_p (EMACS_INT);
extern Lisp_Object Vbuffer_alist;
EXFUN (Fget_buffer, 1);
EXFUN (Fget_buffer_create, 1);
EXFUN (Fgenerate_new_buffer_name, 2);
EXFUN (Fset_buffer, 1);
extern Lisp_Object set_buffer_if_live (Lisp_Object);
EXFUN (Fbarf_if_buffer_read_only, 0);
EXFUN (Fcurrent_buffer, 0);
EXFUN (Fother_buffer, 3);
EXFUN (Foverlay_get, 2);
EXFUN (Fbuffer_modified_p, 1);
EXFUN (Fset_buffer_modified_p, 1);
EXFUN (Fkill_buffer, 1);
EXFUN (Fkill_all_local_variables, 0);
EXFUN (Fbuffer_enable_undo, 1);
EXFUN (Ferase_buffer, 0);
extern Lisp_Object Qpriority, Qwindow, Qbefore_string, Qafter_string;
extern Lisp_Object get_truename_buffer (Lisp_Object);
extern struct buffer *all_buffers;
EXFUN (Fprevious_overlay_change, 1);
EXFUN (Fbuffer_file_name, 1);
extern void init_buffer_once (void);
extern void init_buffer (void);
extern void syms_of_buffer (void);
extern void keys_of_buffer (void);

/* Defined in marker.c */

EXFUN (Fmarker_position, 1);
EXFUN (Fmarker_buffer, 1);
EXFUN (Fcopy_marker, 2);
EXFUN (Fset_marker, 3);
extern EMACS_INT marker_position (Lisp_Object);
extern EMACS_INT marker_byte_position (Lisp_Object);
extern void clear_charpos_cache (struct buffer *);
extern EMACS_INT charpos_to_bytepos (EMACS_INT);
extern EMACS_INT buf_charpos_to_bytepos (struct buffer *, EMACS_INT);
extern EMACS_INT buf_bytepos_to_charpos (struct buffer *, EMACS_INT);
extern void unchain_marker (struct Lisp_Marker *marker);
extern Lisp_Object set_marker_restricted (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object set_marker_both (Lisp_Object, Lisp_Object, EMACS_INT, EMACS_INT);
extern Lisp_Object set_marker_restricted_both (Lisp_Object, Lisp_Object,
                                               EMACS_INT, EMACS_INT);
extern void syms_of_marker (void);

/* Defined in fileio.c */

extern Lisp_Object Qfile_error;
extern Lisp_Object Qfile_exists_p;
extern Lisp_Object Qfile_directory_p;
extern Lisp_Object Qinsert_file_contents;
extern Lisp_Object Qfile_name_history;
EXFUN (Ffind_file_name_handler, 2);
EXFUN (Ffile_name_as_directory, 1);
EXFUN (Fexpand_file_name, 2);
EXFUN (Ffile_name_nondirectory, 1);
EXFUN (Fsubstitute_in_file_name, 1);
EXFUN (Ffile_symlink_p, 1);
EXFUN (Fverify_visited_file_modtime, 1);
EXFUN (Ffile_exists_p, 1);
EXFUN (Ffile_name_absolute_p, 1);
EXFUN (Fdirectory_file_name, 1);
EXFUN (Ffile_name_directory, 1);
extern Lisp_Object expand_and_dir_to_file (Lisp_Object, Lisp_Object);
EXFUN (Ffile_accessible_directory_p, 1);
EXFUN (Funhandled_file_name_directory, 1);
EXFUN (Ffile_directory_p, 1);
EXFUN (Fwrite_region, 7);
EXFUN (Ffile_readable_p, 1);
EXFUN (Fread_file_name, 6);
extern Lisp_Object close_file_unwind (Lisp_Object);
extern Lisp_Object restore_point_unwind (Lisp_Object);
extern void report_file_error (const char *, Lisp_Object) NO_RETURN;
extern int internal_delete_file (Lisp_Object);
extern void syms_of_fileio (void);
extern Lisp_Object make_temp_name (Lisp_Object, int);
extern Lisp_Object Qdelete_file;

/* Defined in abbrev.c */

extern void syms_of_abbrev (void);

/* Defined in search.c */
extern void shrink_regexp_cache (void);
EXFUN (Fstring_match, 3);
extern void restore_search_regs (void);
EXFUN (Fmatch_data, 3);
EXFUN (Fset_match_data, 2);
EXFUN (Fmatch_beginning, 1);
EXFUN (Fmatch_end, 1);
extern void record_unwind_save_match_data (void);
struct re_registers;
extern struct re_pattern_buffer *compile_pattern (Lisp_Object,
						  struct re_registers *,
						  Lisp_Object, int, int);
extern EMACS_INT fast_string_match (Lisp_Object, Lisp_Object);
extern EMACS_INT fast_c_string_match_ignore_case (Lisp_Object, const char *);
extern EMACS_INT fast_string_match_ignore_case (Lisp_Object, Lisp_Object);
extern EMACS_INT fast_looking_at (Lisp_Object, EMACS_INT, EMACS_INT,
                                  EMACS_INT, EMACS_INT, Lisp_Object);
extern EMACS_INT scan_buffer (int, EMACS_INT, EMACS_INT, EMACS_INT,
			      EMACS_INT *, int);
extern EMACS_INT scan_newline (EMACS_INT, EMACS_INT, EMACS_INT, EMACS_INT,
			       EMACS_INT, int);
extern EMACS_INT find_next_newline (EMACS_INT, int);
extern EMACS_INT find_next_newline_no_quit (EMACS_INT, EMACS_INT);
extern EMACS_INT find_before_next_newline (EMACS_INT, EMACS_INT, EMACS_INT);
extern void syms_of_search (void);
extern void clear_regexp_cache (void);

/* Defined in minibuf.c */

extern Lisp_Object Qcompletion_ignore_case;
extern Lisp_Object Vminibuffer_list;
extern Lisp_Object last_minibuf_string;
EXFUN (Fcompleting_read, 8);
EXFUN (Fread_from_minibuffer, 7);
EXFUN (Fread_variable, 2);
EXFUN (Fread_buffer, 3);
EXFUN (Fread_minibuffer, 2);
EXFUN (Feval_minibuffer, 2);
EXFUN (Fread_string, 5);
EXFUN (Fassoc_string, 3);
extern Lisp_Object get_minibuffer (int);
extern void init_minibuf_once (void);
extern void syms_of_minibuf (void);

/* Defined in callint.c */

extern Lisp_Object Qminus, Qplus;
extern Lisp_Object Qwhen;
extern Lisp_Object Qcall_interactively, Qmouse_leave_buffer_hook;
EXFUN (Fprefix_numeric_value, 1);
extern void syms_of_callint (void);

/* Defined in casefiddle.c */

extern Lisp_Object Qidentity;
EXFUN (Fdowncase, 1);
EXFUN (Fupcase, 1);
EXFUN (Fupcase_region, 2);
EXFUN (Fupcase_initials, 1);
EXFUN (Fupcase_initials_region, 2);
extern void syms_of_casefiddle (void);
extern void keys_of_casefiddle (void);

/* Defined in casetab.c */

EXFUN (Fset_case_table, 1);
EXFUN (Fset_standard_case_table, 1);
extern void init_casetab_once (void);
extern void syms_of_casetab (void);

/* Defined in keyboard.c */

extern Lisp_Object echo_message_buffer;
extern struct kboard *echo_kboard;
extern void cancel_echoing (void);
extern Lisp_Object Qdisabled, QCfilter;
extern Lisp_Object Qup, Qdown, Qbottom;
extern Lisp_Object Qtop;
extern int input_pending;
EXFUN (Fdiscard_input, 0);
EXFUN (Frecursive_edit, 0);
EXFUN (Ftop_level, 0) NO_RETURN;
extern Lisp_Object menu_bar_items (Lisp_Object);
extern Lisp_Object tool_bar_items (Lisp_Object, int *);
extern void discard_mouse_events (void);
EXFUN (Fevent_convert_list, 1);
EXFUN (Fread_key_sequence, 5);
EXFUN (Fset_input_interrupt_mode, 1);
EXFUN (Fset_input_mode, 4);
extern Lisp_Object pending_funcalls;
extern int detect_input_pending (void);
extern int detect_input_pending_ignore_squeezables (void);
extern int detect_input_pending_run_timers (int);
extern void safe_run_hooks (Lisp_Object);
extern void cmd_error_internal (Lisp_Object, const char *);
extern Lisp_Object command_loop_1 (void);
extern Lisp_Object recursive_edit_1 (void);
extern void record_auto_save (void);
#ifdef SIGDANGER
extern void force_auto_save_soon (void);
#endif
extern void init_keyboard (void);
extern void syms_of_keyboard (void);
extern void keys_of_keyboard (void);
extern char *push_key_description (unsigned int, char *, int);


/* Defined in indent.c */
EXFUN (Fvertical_motion, 2);
EXFUN (Findent_to, 2);
EXFUN (Fmove_to_column, 2);
extern EMACS_INT current_column (void);
extern void invalidate_current_column (void);
extern int indented_beyond_p (EMACS_INT, EMACS_INT, EMACS_INT);
extern void syms_of_indent (void);

/* Defined in frame.c */
#ifdef HAVE_WINDOW_SYSTEM
#endif /* HAVE_WINDOW_SYSTEM */
extern Lisp_Object Qonly;
extern Lisp_Object Qvisible;
extern void store_frame_param (struct frame *, Lisp_Object, Lisp_Object);
extern void store_in_alist (Lisp_Object *, Lisp_Object, Lisp_Object);
extern Lisp_Object do_switch_frame (Lisp_Object, int, int, Lisp_Object);
#if HAVE_NS
extern Lisp_Object get_frame_param (struct frame *, Lisp_Object);
#endif
extern Lisp_Object frame_buffer_predicate (Lisp_Object);
EXFUN (Fselect_frame, 2);
EXFUN (Fselected_frame, 0);
EXFUN (Fwindow_frame, 1);
EXFUN (Fframe_root_window, 1);
EXFUN (Fframe_first_window, 1);
EXFUN (Fmake_frame_visible, 1);
EXFUN (Ficonify_frame, 1);
EXFUN (Fframe_parameter, 2);
EXFUN (Fmodify_frame_parameters, 2);
EXFUN (Fraise_frame, 1);
EXFUN (Fredirect_frame_focus, 2);
EXFUN (Fset_frame_selected_window, 3);
extern Lisp_Object frame_buffer_list (Lisp_Object);
extern void frames_discard_buffer (Lisp_Object);
extern void set_frame_buffer_list (Lisp_Object, Lisp_Object);
extern void syms_of_frame (void);

/* Defined in emacs.c */
extern char **initial_argv;
extern int initial_argc;
#if defined(HAVE_X_WINDOWS) || defined(HAVE_NS)
extern int display_arg;
#endif
extern Lisp_Object decode_env_path (const char *, const char *);
extern Lisp_Object empty_unibyte_string, empty_multibyte_string;
extern Lisp_Object Qfile_name_handler_alist;
#ifdef FLOAT_CATCH_SIGILL
extern void fatal_error_signal (int);
#endif
EXFUN (Fkill_emacs, 1) NO_RETURN;
#if HAVE_SETLOCALE
void fixup_locale (void);
void synchronize_system_messages_locale (void);
void synchronize_system_time_locale (void);
#else
#define setlocale(category, locale)
#define fixup_locale()
#define synchronize_system_messages_locale()
#define synchronize_system_time_locale()
#endif
void shut_down_emacs (int, int, Lisp_Object);
/* Nonzero means don't do interactive redisplay and don't change tty modes.  */
extern int noninteractive;

/* Nonzero means remove site-lisp directories from load-path.  */
extern int no_site_lisp;

/* Pipe used to send exit notification to the daemon parent at
   startup.  */
extern int daemon_pipe[2];
#define IS_DAEMON (daemon_pipe[1] != 0)

/* Nonzero means don't do use window-system-specific display code.  */
extern int inhibit_window_system;
/* Nonzero means that a filter or a sentinel is running.  */
extern int running_asynch_code;

/* Defined in process.c.  */
extern Lisp_Object QCtype, Qlocal;
EXFUN (Fget_buffer_process, 1);
EXFUN (Fprocess_status, 1);
EXFUN (Fkill_process, 2);
EXFUN (Fwaiting_for_user_input_p, 0);
extern Lisp_Object Qprocessp;
extern void kill_buffer_processes (Lisp_Object);
extern int wait_reading_process_output (int, int, int, int,
                                        Lisp_Object,
                                        struct Lisp_Process *,
                                        int);
extern void add_keyboard_wait_descriptor (int);
extern void delete_keyboard_wait_descriptor (int);
extern void add_gpm_wait_descriptor (int);
extern void delete_gpm_wait_descriptor (int);
extern void close_process_descs (void);
extern void init_process (void);
extern void syms_of_process (void);
extern void setup_process_coding_systems (Lisp_Object);

EXFUN (Fcall_process, MANY);
extern int child_setup (int, int, int, char **, int, Lisp_Object)
#ifndef DOS_NT
 NO_RETURN
#endif
 ;
extern void init_callproc_1 (void);
extern void init_callproc (void);
extern void set_initial_environment (void);
extern void syms_of_callproc (void);

/* Defined in doc.c */
extern Lisp_Object Qfunction_documentation;
EXFUN (Fsubstitute_command_keys, 1);
extern Lisp_Object read_doc_string (Lisp_Object);
extern Lisp_Object get_doc_string (Lisp_Object, int, int);
extern void syms_of_doc (void);
extern int read_bytecode_char (int);

/* Defined in bytecode.c */
extern Lisp_Object Qbytecode;
extern void syms_of_bytecode (void);
extern struct byte_stack *byte_stack_list;
#if BYTE_MARK_STACK
extern void mark_byte_stack (void);
#endif
extern void unmark_byte_stack (void);
extern Lisp_Object exec_byte_code (Lisp_Object, Lisp_Object, Lisp_Object,
				   Lisp_Object, int, Lisp_Object *);

/* Defined in macros.c */
extern Lisp_Object Qexecute_kbd_macro;
EXFUN (Fexecute_kbd_macro, 3);
EXFUN (Fcancel_kbd_macro_events, 0);
extern void init_macros (void);
extern void syms_of_macros (void);

/* Defined in undo.c */
extern Lisp_Object Qapply;
extern Lisp_Object Qinhibit_read_only;
EXFUN (Fundo_boundary, 0);
extern void truncate_undo_list (struct buffer *);
extern void record_marker_adjustment (Lisp_Object, EMACS_INT);
extern void record_insert (EMACS_INT, EMACS_INT);
extern void record_delete (EMACS_INT, Lisp_Object);
extern void record_first_change (void);
extern void record_change (EMACS_INT, EMACS_INT);
extern void record_property_change (EMACS_INT, EMACS_INT,
				    Lisp_Object, Lisp_Object,
                                    Lisp_Object);
extern void syms_of_undo (void);
/* Defined in textprop.c */
extern Lisp_Object Qfont, Qmouse_face;
extern Lisp_Object Qinsert_in_front_hooks, Qinsert_behind_hooks;
extern Lisp_Object Qfront_sticky, Qrear_nonsticky;
extern Lisp_Object Qminibuffer_prompt;

EXFUN (Fnext_single_property_change, 4);
EXFUN (Fnext_single_char_property_change, 4);
EXFUN (Fprevious_single_property_change, 4);
EXFUN (Fget_text_property, 3);
EXFUN (Fput_text_property, 5);
EXFUN (Fprevious_char_property_change, 2);
EXFUN (Fnext_char_property_change, 2);
extern void report_interval_modification (Lisp_Object, Lisp_Object);

/* Defined in menu.c */
extern void syms_of_menu (void);

/* Defined in xmenu.c */
EXFUN (Fx_popup_menu, 2);
EXFUN (Fx_popup_dialog, 3);
extern void syms_of_xmenu (void);

/* Defined in termchar.h */
struct tty_display_info;

/* Defined in termhooks.h */
struct terminal;

/* Defined in sysdep.c */
#ifndef HAVE_GET_CURRENT_DIR_NAME
extern char *get_current_dir_name (void);
#endif
extern void stuff_char (char c);
extern void init_sigio (int);
extern void sys_subshell (void);
extern void sys_suspend (void);
extern void discard_tty_input (void);
extern void init_sys_modes (struct tty_display_info *);
extern void reset_sys_modes (struct tty_display_info *);
extern void init_all_sys_modes (void);
extern void reset_all_sys_modes (void);
extern void wait_for_termination (int);
extern void flush_pending_output (int);
extern void child_setup_tty (int);
extern void setup_pty (int);
extern int set_window_size (int, int, int);
extern long get_random (void);
extern void seed_random (long);
extern int emacs_open (const char *, int, int);
extern int emacs_close (int);
extern EMACS_INT emacs_read (int, char *, EMACS_INT);
extern EMACS_INT emacs_write (int, const char *, EMACS_INT);
enum { READLINK_BUFSIZE = 1024 };
extern char *emacs_readlink (const char *, char [READLINK_BUFSIZE]);
#ifndef HAVE_MEMSET
extern void *memset (void *, int, size_t);
#endif
#ifndef HAVE_MEMCPY
extern void *memcpy (void *, void *, size_t);
#endif
#ifndef HAVE_MEMMOVE
extern void *memmove (void *, void *, size_t);
#endif
#ifndef HAVE_MEMCMP
extern int memcmp (void *, void *, size_t);
#endif

EXFUN (Funlock_buffer, 0);
extern void unlock_all_files (void);
extern void lock_file (Lisp_Object);
extern void unlock_file (Lisp_Object);
extern void unlock_buffer (struct buffer *);
extern void syms_of_filelock (void);
extern void init_filelock (void);

/* Defined in sound.c */
extern void syms_of_sound (void);
extern void init_sound (void);

/* Defined in category.c */
extern void init_category_once (void);
extern Lisp_Object char_category_set (int);
extern void syms_of_category (void);

/* Defined in ccl.c */
extern void syms_of_ccl (void);

/* Defined in dired.c */
extern void syms_of_dired (void);
extern Lisp_Object directory_files_internal (Lisp_Object, Lisp_Object,
                                             Lisp_Object, Lisp_Object,
                                             int, Lisp_Object);

/* Defined in term.c */
extern int *char_ins_del_vector;
extern void mark_ttys (void);
extern void syms_of_term (void);
extern void fatal (const char *msgid, ...)
  NO_RETURN ATTRIBUTE_FORMAT_PRINTF (1, 2);

/* Defined in terminal.c */
EXFUN (Fframe_terminal, 1);
EXFUN (Fdelete_terminal, 2);
extern void syms_of_terminal (void);

/* Defined in font.c */
extern void syms_of_font (void);
extern void init_font (void);

#ifdef HAVE_WINDOW_SYSTEM
/* Defined in fontset.c */
extern void syms_of_fontset (void);

/* Defined in xfns.c, w32fns.c, or macfns.c */
extern Lisp_Object Qfont_param;
EXFUN (Fxw_display_color_p, 1);
EXFUN (Fx_focus_frame, 1);
#endif

/* Defined in xfaces.c */
extern Lisp_Object Qdefault, Qtool_bar, Qfringe;
extern Lisp_Object Qheader_line, Qscroll_bar, Qcursor;
extern Lisp_Object Qmode_line_inactive;
extern Lisp_Object Qface;
extern Lisp_Object Qnormal;
extern Lisp_Object QCfamily, QCweight, QCslant;
extern Lisp_Object QCheight, QCname, QCwidth, QCforeground, QCbackground;
extern Lisp_Object Vface_alternative_font_family_alist;
extern Lisp_Object Vface_alternative_font_registry_alist;
EXFUN (Fclear_face_cache, 1);
EXFUN (Fx_load_color_file, 1);
extern void syms_of_xfaces (void);

#ifdef HAVE_X_WINDOWS
/* Defined in xfns.c */
extern void syms_of_xfns (void);

/* Defined in xsmfns.c */
extern void syms_of_xsmfns (void);

/* Defined in xselect.c */
extern void syms_of_xselect (void);

/* Defined in xterm.c */
extern void syms_of_xterm (void);
#endif /* HAVE_X_WINDOWS */

#ifdef HAVE_WINDOW_SYSTEM
/* Defined in xterm.c, nsterm.m, w32term.c */
extern char *x_get_keysym_name (int);
#endif /* HAVE_WINDOW_SYSTEM */

#ifdef MSDOS
/* Defined in msdos.c */
EXFUN (Fmsdos_downcase_filename, 1);
#endif

#ifdef HAVE_LIBXML2
/* Defined in xml.c */
extern void syms_of_xml (void);
#endif

#ifdef HAVE_MENUS
/* Defined in (x|w32)fns.c, nsfns.m...  */
extern int have_menus_p (void);
#endif

#ifdef HAVE_DBUS
/* Defined in dbusbind.c */
void syms_of_dbusbind (void);
#endif

#ifdef DOS_NT
/* Defined in msdos.c, w32.c */
extern char *emacs_root_dir (void);
#endif /* DOS_NT */
\f
/* Nonzero means Emacs has already been initialized.
   Used during startup to detect startup of dumped Emacs.  */
extern int initialized;

extern int immediate_quit;	    /* Nonzero means ^G can quit instantly */

extern POINTER_TYPE *xmalloc (size_t);
extern POINTER_TYPE *xrealloc (POINTER_TYPE *, size_t);
extern void xfree (POINTER_TYPE *);

extern char *xstrdup (const char *);

extern char *egetenv (const char *);

/* Set up the name of the machine we're running on.  */
extern void init_system_name (void);

/* Some systems (e.g., NT) use a different path separator than Unix,
   in addition to a device separator.  Set the path separator
   to '/', and don't test for a device separator in IS_ANY_SEP.  */

#define DIRECTORY_SEP '/'
#ifndef IS_DIRECTORY_SEP
#define IS_DIRECTORY_SEP(_c_) ((_c_) == DIRECTORY_SEP)
#endif
#ifndef IS_DEVICE_SEP
#ifndef DEVICE_SEP
#define IS_DEVICE_SEP(_c_) 0
#else
#define IS_DEVICE_SEP(_c_) ((_c_) == DEVICE_SEP)
#endif
#endif
#ifndef IS_ANY_SEP
#define IS_ANY_SEP(_c_) (IS_DIRECTORY_SEP (_c_))
#endif

#define SWITCH_ENUM_CAST(x) (x)

/* Loop over Lisp list LIST.  Signal an error if LIST is not a proper
   list, or if it contains circles.

   HARE and TORTOISE should be the names of Lisp_Object variables, and
   N should be the name of an EMACS_INT variable declared in the
   function where the macro is used.  Each nested loop should use
   its own variables.

   In the loop body, HARE is set to each cons of LIST, and N is the
   length of the list processed so far.  */

#define LIST_END_P(list, obj)				\
  (NILP (obj)						\
   ? 1							\
   : (CONSP (obj)					\
      ? 0						\
      : (wrong_type_argument (Qlistp, (list))), 1))

/* Use this to suppress gcc's `...may be used before initialized' warnings. */
#ifdef lint
# define IF_LINT(Code) Code
#else
# define IF_LINT(Code) /* empty */
#endif

/* The ubiquitous min and max macros.  */

#ifdef max
#undef max
#undef min
#endif
#define min(a, b)	((a) < (b) ? (a) : (b))
#define max(a, b)	((a) > (b) ? (a) : (b))

/* We used to use `abs', but that clashes with system headers on some
   platforms, and using a name reserved by Standard C is a bad idea
   anyway.  */
#if !defined(eabs)
#define eabs(x)         ((x) < 0 ? -(x) : (x))
#endif

/* Return a fixnum or float, depending on whether VAL fits in a Lisp
   fixnum.  */

#define make_fixnum_or_float(val) \
   (FIXNUM_OVERFLOW_P (val) \
    ? make_float (val) \
    : make_number ((EMACS_INT)(val)))


/* Checks the `cycle check' variable CHECK to see if it indicates that
   EL is part of a cycle; CHECK must be either Qnil or a value returned
   by an earlier use of CYCLE_CHECK.  SUSPICIOUS is the number of
   elements after which a cycle might be suspected; after that many
   elements, this macro begins consing in order to keep more precise
   track of elements.

   Returns nil if a cycle was detected, otherwise a new value for CHECK
   that includes EL.

   CHECK is evaluated multiple times, EL and SUSPICIOUS 0 or 1 times, so
   the caller should make sure that's ok.  */

#define CYCLE_CHECK(check, el, suspicious)	\
  (NILP (check)					\
   ? make_number (0)				\
   : (INTEGERP (check)				\
      ? (XFASTINT (check) < (suspicious)	\
	 ? make_number (XFASTINT (check) + 1)	\
	 : Fcons (el, Qnil))			\
      : (!NILP (Fmemq ((el), (check)))		\
	 ? Qnil					\
	 : Fcons ((el), (check)))))


/* SAFE_ALLOCA normally allocates memory on the stack, but if size is
   larger than MAX_ALLOCA, use xmalloc to avoid overflowing the stack.  */

#define MAX_ALLOCA 16*1024

extern Lisp_Object safe_alloca_unwind (Lisp_Object);

#define USE_SAFE_ALLOCA			\
  int sa_count = (int) SPECPDL_INDEX (), sa_must_free = 0

/* SAFE_ALLOCA allocates a simple buffer.  */

#define SAFE_ALLOCA(buf, type, size)			  \
  do {							  \
    if ((size) < MAX_ALLOCA)				  \
      buf = (type) alloca (size);			  \
    else						  \
      {							  \
	buf = (type) xmalloc (size);			  \
	sa_must_free = 1;				  \
	record_unwind_protect (safe_alloca_unwind,	  \
			       make_save_value (buf, 0)); \
      }							  \
  } while (0)

/* SAFE_FREE frees xmalloced memory and enables GC as needed.  */

#define SAFE_FREE()			\
  do {					\
    if (sa_must_free) {			\
      sa_must_free = 0;			\
      unbind_to (sa_count, Qnil);	\
    }					\
  } while (0)


/* SAFE_ALLOCA_LISP allocates an array of Lisp_Objects.  */

#define SAFE_ALLOCA_LISP(buf, nelt)			  \
  do {							  \
    int size_ = (nelt) * sizeof (Lisp_Object);		  \
    if (size_ < MAX_ALLOCA)				  \
      buf = (Lisp_Object *) alloca (size_);		  \
    else						  \
      {							  \
	Lisp_Object arg_;				  \
	buf = (Lisp_Object *) xmalloc (size_);		  \
	arg_ = make_save_value (buf, nelt);		  \
	XSAVE_VALUE (arg_)->dogc = 1;			  \
	sa_must_free = 1;				  \
	record_unwind_protect (safe_alloca_unwind, arg_); \
      }							  \
  } while (0)


#include "globals.h"

#endif /* EMACS_LISP_H */