/* Fundamental definitions for GNU Emacs Lisp interpreter. -*- coding: utf-8 -*-

Copyright (C) 1985-2024 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 <https://www.gnu.org/licenses/>.  */

#ifndef EMACS_LISP_H
#define EMACS_LISP_H

#include <alloca.h>
#include <setjmp.h>
#include <stdarg.h>
#include <stdbit.h>
#include <stdckdint.h>
#include <stddef.h>
#include <string.h>
#include <float.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#include <attribute.h>
#include <byteswap.h>
#include <intprops.h>
#include <verify.h>

INLINE_HEADER_BEGIN

#ifdef HAVE_MPS
union gc_header;
extern void gc_maybe_quit (void);
extern void gc_maybe_dont_quit (void);
extern bool gc_signal_handler_can_run (int);
#else
INLINE void gc_maybe_quit (void)
{
}

INLINE void gc_maybe_dont_quit (void)
{
}

INLINE bool gc_signal_handler_can_run (int sig)
{
  return true;
}
union gc_header { };
#endif

#ifdef HAVE_MPS
enum igc_obj_type;
extern void gc_init_header (union gc_header *header, enum igc_obj_type type);
extern void gc_init_header_bytes (union gc_header *header, enum igc_obj_type type, size_t bytes);
#else
/* These are macros so they don't evaluate their `type' argument.  */
#define gc_init_header(header, type) ((void)(header))
#define gc_init_header_bytes(header, type, nbytes) ((void)(header))
#endif

#define GC_HEADER union gc_header gc_header;
#define GC_HEADER_INIT {},

/* Enable this with --enable-checking=igc_check_fwd. */
# if defined HAVE_MPS && defined IGC_CHECK_FWD
void igc_check_fwd (void *client, bool is_vector);
# else
#define igc_check_fwd(c, v) ((void) 0)
# endif

/* Define a TYPE constant ID as an externally visible name.  Use like this:

      DEFINE_GDB_SYMBOL_BEGIN (TYPE, ID)
      # define ID (some integer preprocessor expression of type TYPE)
      DEFINE_GDB_SYMBOL_END (ID)

   This hack is for the benefit of compilers that do not make macro
   definitions or enums visible to the debugger.  It's used for symbols
   that .gdbinit needs.  */

#define DECLARE_GDB_SYM(type, id) type const id EXTERNALLY_VISIBLE
#ifdef MAIN_PROGRAM
# define DEFINE_GDB_SYMBOL_BEGIN(type, id) \
   extern DECLARE_GDB_SYM (type, id); DECLARE_GDB_SYM (type, id)
# define DEFINE_GDB_SYMBOL_END(id) = id;
#else
# define DEFINE_GDB_SYMBOL_BEGIN(type, id) extern DECLARE_GDB_SYM (type, id)
# define DEFINE_GDB_SYMBOL_END(val) ;
#endif

/* The ubiquitous max and min macros.  */
#undef min
#undef max
#define max(a, b) ((a) > (b) ? (a) : (b))
#define min(a, b) ((a) < (b) ? (a) : (b))

/* Number of elements in an array.  */
#define ARRAYELTS(arr) (sizeof (arr) / sizeof (arr)[0])

/* Number of bits in a Lisp_Object tag.  */
DEFINE_GDB_SYMBOL_BEGIN (int, GCTYPEBITS)
#define GCTYPEBITS 3
DEFINE_GDB_SYMBOL_END (GCTYPEBITS)

/* EMACS_INT - signed integer wide enough to hold an Emacs value
   EMACS_INT_WIDTH - width in bits of EMACS_INT
   EMACS_INT_MAX - maximum value of EMACS_INT; can be used in #if
   pI - printf length modifier for EMACS_INT
   EMACS_UINT - unsigned variant of EMACS_INT */
#ifndef EMACS_INT_MAX
# if INTPTR_MAX <= 0
#  error "INTPTR_MAX misconfigured"
# elif INTPTR_MAX <= INT_MAX && !defined WIDE_EMACS_INT
typedef int EMACS_INT;
typedef unsigned int EMACS_UINT;
enum { EMACS_INT_WIDTH = INT_WIDTH, EMACS_UINT_WIDTH = UINT_WIDTH };
#  define EMACS_INT_MAX INT_MAX
#  define pI ""
# elif INTPTR_MAX <= LONG_MAX && !defined WIDE_EMACS_INT
typedef long int EMACS_INT;
typedef unsigned long EMACS_UINT;
enum { EMACS_INT_WIDTH = LONG_WIDTH, EMACS_UINT_WIDTH = ULONG_WIDTH };
#  define EMACS_INT_MAX LONG_MAX
#  define pI "l"
# elif INTPTR_MAX <= LLONG_MAX
typedef long long int EMACS_INT;
typedef unsigned long long int EMACS_UINT;
enum { EMACS_INT_WIDTH = LLONG_WIDTH, EMACS_UINT_WIDTH = ULLONG_WIDTH };
#  define EMACS_INT_MAX LLONG_MAX
/* MinGW supports %lld only if __USE_MINGW_ANSI_STDIO is non-zero,
   which is arranged by config.h, and (for mingw.org) if GCC is 6.0 or
   later and the runtime version is 5.0.0 or later.  Otherwise,
   printf-like functions are declared with __ms_printf__ attribute,
   which will cause a warning for %lld etc.  */
#  if defined __MINGW32__						\
  && (!defined __USE_MINGW_ANSI_STDIO					\
      || (!defined MINGW_W64						\
	  && !(GNUC_PREREQ (6, 0, 0) && __MINGW32_MAJOR_VERSION >= 5)))
#   define pI "I64"
#  else	 /* ! MinGW */
#   define pI "ll"
#  endif
# else
#  error "INTPTR_MAX too large"
# endif
#endif

/* Number of bits to put in each character in the internal representation
   of bool vectors.  This should not vary across implementations.  */
enum {  BOOL_VECTOR_BITS_PER_CHAR =
#define BOOL_VECTOR_BITS_PER_CHAR 8
        BOOL_VECTOR_BITS_PER_CHAR
};

/* An unsigned integer type representing a fixed-length bit sequence,
   suitable for bool vector words, GC mark bits, etc.  Normally it is size_t
   for speed, but on weird platforms it is unsigned char and not all
   its bits are used.  */
#if BOOL_VECTOR_BITS_PER_CHAR == CHAR_BIT
typedef size_t bits_word;
# define BITS_WORD_MAX SIZE_MAX
enum { BITS_PER_BITS_WORD = SIZE_WIDTH };
#else
typedef unsigned char bits_word;
# define BITS_WORD_MAX ((1u << BOOL_VECTOR_BITS_PER_CHAR) - 1)
enum { BITS_PER_BITS_WORD = BOOL_VECTOR_BITS_PER_CHAR };
#endif
static_assert (BITS_WORD_MAX >> (BITS_PER_BITS_WORD - 1) == 1);

/* Use pD to format ptrdiff_t values, which suffice for indexes into
   buffers and strings.  Emacs never allocates objects larger than
   PTRDIFF_MAX bytes, as they cause problems with pointer subtraction.
   In C99, pD can always be "t", as we no longer need to worry about
   pre-C99 libraries such as glibc 2.0 (1997) and Solaris 8 (2000).  */
#define pD "t"

/* Convenience macro for rarely-used functions that do not return.  */
#define AVOID _Noreturn ATTRIBUTE_COLD void

/* Extra internal type checking?  */

/* Define Emacs versions of <assert.h>'s 'assert (COND)' and <verify.h>'s
   'assume (COND)'.  COND should be free of side effects, as it may or
   may not be evaluated.

   'eassert (COND)' checks COND at runtime if ENABLE_CHECKING is
   defined and suppress_checking is false, and does nothing otherwise.
   Emacs dies if COND is checked and is false.  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.

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

   eassume is like eassert except that it also causes the compiler to
   assume that COND is true afterwards, regardless of whether runtime
   checking is enabled.  This can improve performance in some cases,
   though it can degrade performance in others.  It's often suboptimal
   for COND to call external functions or access volatile storage.  */

#ifndef ENABLE_CHECKING
# define eassert(cond) ((void) (false && (cond))) /* Check COND compiles.  */
# define eassume(cond) assume (cond)
#else /* ENABLE_CHECKING */

extern AVOID die (const char *, const char *, int);

extern bool suppress_checking EXTERNALLY_VISIBLE;

# define eassert(cond)						\
   (suppress_checking || (cond) 				\
    ? (void) 0							\
    : die (# cond, __FILE__, __LINE__))
# define eassume(cond)						\
   (suppress_checking						\
    ? assume (cond)						\
    : (cond)							\
    ? (void) 0							\
    : die (# cond, __FILE__, __LINE__))
#endif /* ENABLE_CHECKING */

\f
/* Use the configure flag --enable-check-lisp-object-type to make
   Lisp_Object use a struct type instead of the default int.  The flag
   causes CHECK_LISP_OBJECT_TYPE to be defined.  */

/***** Select the tagging scheme.  *****/
/* The following option controls the tagging scheme:
   - 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, then use the top 3 bits for tagging, thus
   restricting our possible address range.

   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 some non-GC Lisp_Objects, all of which are aligned via
   GCALIGNED_UNION_MEMBER.  */

enum Lisp_Bits
  {
    /* Number of bits in a Lisp_Object value, not counting the tag.  */
    VALBITS = EMACS_INT_WIDTH - GCTYPEBITS,

    /* Number of bits in a fixnum value, not counting the tag.  */
    FIXNUM_BITS = VALBITS + 1
  };

/* Number of bits in a fixnum tag; can be used in #if.  */
DEFINE_GDB_SYMBOL_BEGIN (int, INTTYPEBITS)
#define INTTYPEBITS (GCTYPEBITS - 1)
DEFINE_GDB_SYMBOL_END (INTTYPEBITS)

/* The maximum value that can be stored in a EMACS_INT, assuming all
   bits other than the type bits contribute to a nonnegative signed value.
   This can be used in #if, e.g., '#if USE_LSB_TAG' below expands to an
   expression involving VAL_MAX.  */
#define VAL_MAX (EMACS_INT_MAX >> (GCTYPEBITS - 1))

/* Whether the least-significant bits of an EMACS_INT contain the tag.
   On hosts where pointers-as-ints do not exceed VAL_MAX / 2, USE_LSB_TAG is:
    a. unnecessary, because the top bits of an EMACS_INT are unused, and
    b. slower, because it typically requires extra masking.
   So, USE_LSB_TAG is true only on hosts where it might be useful.  */
DEFINE_GDB_SYMBOL_BEGIN (bool, USE_LSB_TAG)
#ifndef HAVE_MPS
#define USE_LSB_TAG (VAL_MAX / 2 < INTPTR_MAX)
#else
#define USE_LSB_TAG 1
#endif
DEFINE_GDB_SYMBOL_END (USE_LSB_TAG)

/* Mask for the value (as opposed to the type bits) of a Lisp object.  */
DEFINE_GDB_SYMBOL_BEGIN (EMACS_INT, VALMASK)
# define VALMASK (USE_LSB_TAG ? - (1 << GCTYPEBITS) : VAL_MAX)
DEFINE_GDB_SYMBOL_END (VALMASK)

/* Ignore 'alignas' on compilers lacking it.  */
#if (!defined alignas && !defined __alignas_is_defined \
     && __STDC_VERSION__ < 202311 && __cplusplus < 201103)
# define alignas(a)
#endif

/* Minimum alignment requirement for Lisp objects, imposed by the
   internal representation of tagged pointers.  It is 2**GCTYPEBITS if
   USE_LSB_TAG, 1 otherwise.  It must be a literal integer constant,
   for older versions of GCC (through at least 4.9).  */
#if USE_LSB_TAG
# define GCALIGNMENT 8
# if GCALIGNMENT != 1 << GCTYPEBITS
#  error "GCALIGNMENT and GCTYPEBITS are inconsistent"
# endif
#else
# define GCALIGNMENT 1
#endif

/* To cause a union to have alignment of at least GCALIGNMENT, put
   GCALIGNED_UNION_MEMBER in its member list.

   If a struct is always GC-aligned (either by the GC, or via
   allocation in a containing union that has GCALIGNED_UNION_MEMBER)
   and does not contain a GC-aligned struct or union, putting
   GCALIGNED_STRUCT after its closing '}' can help the compiler
   generate better code.  Also, such structs should be added to the
   emacs_align_type union in alloc.c.

   Although these macros are reasonably portable, they are not
   guaranteed on non-GCC platforms, as the C standard does not require
   support for alignment to GCALIGNMENT and older compilers may ignore
   alignment requests.  For any type T where garbage collection requires
   alignment, use static_assert (GCALIGNED (T)) to verify the
   requirement on the current platform.  Types need this check if their
   objects can be allocated outside the garbage collector.  For example,
   struct Lisp_Symbol needs the check because of lispsym and struct
   Lisp_Cons needs it because of STACK_CONS.  */

#define GCALIGNED_UNION_MEMBER char alignas (GCALIGNMENT) gcaligned;
#if HAVE_STRUCT_ATTRIBUTE_ALIGNED
# define GCALIGNED_STRUCT __attribute__ ((aligned (GCALIGNMENT)))
#else
# define GCALIGNED_STRUCT
#endif
#define GCALIGNED(type) (alignof (type) % GCALIGNMENT == 0)

#ifdef HAVE_MPS
union gc_header
{
  uint64_t v;
  GCALIGNED_UNION_MEMBER
};
#endif

/* Lisp_Word is a scalar word suitable for holding a tagged pointer or
   integer.  Usually it is a pointer to a deliberately-incomplete type
   'struct Lisp_X'.  However, it is EMACS_INT when Lisp_Objects and
   pointers differ in width.  */

#define LISP_WORDS_ARE_POINTERS (EMACS_INT_MAX == INTPTR_MAX)
#if LISP_WORDS_ARE_POINTERS
/* TAG_PTR_INITIALLY casts to Lisp_Word and can be used in static initializers
   so this typedef assumes static initializers can contain casts to pointers.
   All Emacs targets support this extension to the C standard.  */
typedef struct Lisp_X *Lisp_Word;
#else
typedef EMACS_INT Lisp_Word;
#endif

/* Some operations are so commonly executed that they are implemented
   as macros, not functions, because otherwise runtime performance would
   suffer too much when compiling with GCC without optimization.
   There's no need to inline everything, just the operations that
   would otherwise cause a serious performance problem.

   For each such operation OP, define a macro lisp_h_OP that contains
   the operation's implementation.  That way, OP can be implemented
   via a macro definition like this:

     #define OP(x) lisp_h_OP (x)

   and/or via a function definition like this:

     Lisp_Object (OP) (Lisp_Object x) { return lisp_h_OP (x); }

   without worrying about the implementations diverging, since
   lisp_h_OP defines the actual implementation.  The lisp_h_OP macros
   are intended to be private to this include file, and should not be
   used elsewhere.  They should evaluate each argument exactly once,
   so that they behave like their functional counterparts.

   FIXME: Remove the lisp_h_OP macros, and define just the inline OP
   functions, once "gcc -Og" (new to GCC 4.8) or equivalent works well
   enough for Emacs developers.  Maybe in the year 2025.  See Bug#11935.

   For the macros that have corresponding functions (defined later),
   see these functions for commentary.  */

/* Convert among the various Lisp-related types: I for EMACS_INT, L
   for Lisp_Object, P for void *.

   These use the following mnemonics:

   XLI: Lisp_Object to Integer;
   XIL: Integer to Lisp_Object;
   XLP: Lisp_Object to Pointer.  */

#if !CHECK_LISP_OBJECT_TYPE
# if LISP_WORDS_ARE_POINTERS
#  define lisp_h_XLI(o) ((EMACS_INT) (o))
#  define lisp_h_XIL(i) ((Lisp_Object) (i))
#  define lisp_h_XLP(o) ((void *) (o))
# else
#  define lisp_h_XLI(o) (o)
#  define lisp_h_XIL(i) (i)
#  define lisp_h_XLP(o) ((void *) (uintptr_t) (o))
# endif
# define lisp_h_Qnil 0
#else
# if LISP_WORDS_ARE_POINTERS
#  define lisp_h_XLI(o) ((EMACS_INT) (o).i)
#  define lisp_h_XIL(i) ((Lisp_Object) {(Lisp_Word) (i)})
#  define lisp_h_XLP(o) ((void *) (o).i)
# else
#  define lisp_h_XLI(o) ((o).i)
#  define lisp_h_XIL(i) ((Lisp_Object) {i})
#  define lisp_h_XLP(o) ((void *) (uintptr_t) (o).i)
# endif
# define lisp_h_Qnil {0}
#endif

#define lisp_h_CHECK_FIXNUM(x) CHECK_TYPE (FIXNUMP (x), Qfixnump, x)
#define lisp_h_CHECK_SYMBOL(x) CHECK_TYPE (SYMBOLP (x), Qsymbolp, x)
#define lisp_h_CHECK_TYPE(ok, predicate, x) \
   ((ok) ? (void) 0 : wrong_type_argument (predicate, x))
#define lisp_h_CONSP(x) TAGGEDP (x, Lisp_Cons)
#define lisp_h_BASE_EQ(x, y) (XLI (x) == XLI (y))

#define lisp_h_FIXNUMP(x) \
   (! (((unsigned) (XLI (x) >> (USE_LSB_TAG ? 0 : FIXNUM_BITS)) \
	- (unsigned) (Lisp_Int0 >> !USE_LSB_TAG)) \
       & ((1 << INTTYPEBITS) - 1)))
#define lisp_h_FLOATP(x) TAGGEDP (x, Lisp_Float)
#define lisp_h_NILP(x)  BASE_EQ (x, Qnil)
#define lisp_h_SYMBOL_CONSTANT_P(sym) \
   (XSYMBOL (sym)->u.s.trapped_write == SYMBOL_NOWRITE)
#define lisp_h_SYMBOL_TRAPPED_WRITE_P(sym) (XSYMBOL (sym)->u.s.trapped_write)
#define lisp_h_SYMBOL_WITH_POS_P(x) PSEUDOVECTORP (x, PVEC_SYMBOL_WITH_POS)
#define lisp_h_BARE_SYMBOL_P(x) TAGGEDP (x, Lisp_Symbol)
#define lisp_h_TAGGEDP(a, tag) \
   (! (((unsigned) (XLI (a) >> (USE_LSB_TAG ? 0 : VALBITS)) \
	- (unsigned) (tag)) \
       & ((1 << GCTYPEBITS) - 1)))
#define lisp_h_VECTORLIKEP(x) TAGGEDP (x, Lisp_Vectorlike)
#define lisp_h_XCAR(c) XCONS (c)->u.s.car
#define lisp_h_XCDR(c) XCONS (c)->u.s.u.cdr
#ifndef HAVE_MPS
#define lisp_h_XHASH(a) XUFIXNUM_RAW (a)
#endif
#if USE_LSB_TAG
# define lisp_h_make_fixnum_wrap(n) \
    XIL ((EMACS_INT) (((EMACS_UINT) (n) << INTTYPEBITS) + Lisp_Int0))
# if defined HAVE_STATEMENT_EXPRESSIONS && defined HAVE_TYPEOF
#  define lisp_h_make_fixnum(n) \
     ({ typeof (+(n)) lisp_h_make_fixnum_n = n; \
	eassert (!FIXNUM_OVERFLOW_P (lisp_h_make_fixnum_n)); \
	lisp_h_make_fixnum_wrap (lisp_h_make_fixnum_n); })
# else
#  define lisp_h_make_fixnum(n) lisp_h_make_fixnum_wrap (n)
# endif
# define lisp_h_XFIXNUM_RAW(a) (XLI (a) >> INTTYPEBITS)
# define lisp_h_XTYPE(a) ((enum Lisp_Type) (XLI (a) & ~VALMASK))
#endif

/* When DEFINE_KEY_OPS_AS_MACROS, define key operations as macros to
   cajole the compiler into inlining them; otherwise define them as
   inline functions as this is cleaner and can be more efficient.
   The default is true if the compiler is GCC-like and if function
   inlining is disabled because the compiler is not optimizing or is
   optimizing for size.  Otherwise the default is false.  */
#ifndef DEFINE_KEY_OPS_AS_MACROS
# if (defined __NO_INLINE__ \
      && ! defined __OPTIMIZE__ && ! defined __OPTIMIZE_SIZE__)
#  define DEFINE_KEY_OPS_AS_MACROS true
# else
#  define DEFINE_KEY_OPS_AS_MACROS false
# endif
#endif

#if DEFINE_KEY_OPS_AS_MACROS
# define XLI(o) lisp_h_XLI (o)
# define XIL(i) lisp_h_XIL (i)
# define XLP(o) lisp_h_XLP (o)
# define BARE_SYMBOL_P(x) lisp_h_BARE_SYMBOL_P (x)
# define CHECK_FIXNUM(x) lisp_h_CHECK_FIXNUM (x)
# define CHECK_SYMBOL(x) lisp_h_CHECK_SYMBOL (x)
# define CHECK_TYPE(ok, predicate, x) lisp_h_CHECK_TYPE (ok, predicate, x)
# define CONSP(x) lisp_h_CONSP (x)
# define BASE_EQ(x, y) lisp_h_BASE_EQ (x, y)
# define FLOATP(x) lisp_h_FLOATP (x)
# define FIXNUMP(x) lisp_h_FIXNUMP (x)
# define NILP(x) lisp_h_NILP (x)
# define SYMBOL_CONSTANT_P(sym) lisp_h_SYMBOL_CONSTANT_P (sym)
# define SYMBOL_TRAPPED_WRITE_P(sym) lisp_h_SYMBOL_TRAPPED_WRITE_P (sym)
# define TAGGEDP(a, tag) lisp_h_TAGGEDP (a, tag)
# define VECTORLIKEP(x) lisp_h_VECTORLIKEP (x)
# define XCAR(c) lisp_h_XCAR (c)
# define XCDR(c) lisp_h_XCDR (c)
#ifndef HAVE_MPS
# define XHASH(a) lisp_h_XHASH (a)
#endif
# if USE_LSB_TAG
#  define make_fixnum(n) lisp_h_make_fixnum (n)
#  define XFIXNUM_RAW(a) lisp_h_XFIXNUM_RAW (a)
#  define XTYPE(a) lisp_h_XTYPE (a)
# endif
#endif


/* Define the fundamental Lisp data structures.  */

/* This is the set of Lisp data types.  If you want to define a new
   data type, read the comments after Lisp_Fwd_Type definition
   below.  */

/* Fixnums 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 INTMASK (EMACS_INT_MAX >> (INTTYPEBITS - 1))
#define case_Lisp_Int case Lisp_Int0: case Lisp_Int1

/* Idea stolen from GDB.  Pedantic GCC complains about enum bitfields,
   and xlc and Oracle Studio c99 complain vociferously about them.  */
#if (defined __STRICT_ANSI__ || defined __IBMC__ \
     || (defined __SUNPRO_C && __STDC__))
#define ENUM_BF(TYPE) unsigned int
#else
#define ENUM_BF(TYPE) enum TYPE
#endif


/* Lisp_Object tagging scheme:
        Tag location
   Upper bits  Lower bits  Type        Payload
   000.......  .......000  symbol      offset from lispsym to struct Lisp_Symbol
   001.......  .......001  unused
   01........  ........10  fixnum      signed integer of FIXNUM_BITS
   110.......  .......011  cons        pointer to struct Lisp_Cons
   100.......  .......100  string      pointer to struct Lisp_String
   101.......  .......101  vectorlike  pointer to struct vectorlike_header
   111.......  .......111  float       pointer to struct Lisp_Float  */
enum Lisp_Type
  {
    /* Symbol.  XSYMBOL (object) points to a struct Lisp_Symbol.  */
    Lisp_Symbol = 0,

    /* Type 1 is currently unused.  */
    Lisp_Type_Unused0 = 1,

    /* Fixnum.  XFIXNUM (obj) is the integer value.  */
    Lisp_Int0 = 2,
    Lisp_Int1 = USE_LSB_TAG ? 6 : 3,

    /* String.  XSTRING (object) points to a struct Lisp_String.
       The length of the string, and its contents, are stored therein.  */
    Lisp_String = 4,

    /* 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 = USE_LSB_TAG ? 3 : 6,

    /* Must be last entry in Lisp_Type enumeration.  */
    Lisp_Float = 7
  };

/* 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.  */
  };

/* If you want to define a new Lisp data type, here are some
   instructions.

   First, there are already a couple of Lisp types that can be used if
   your new type does not need to be exposed to Lisp programs nor
   displayed to users.  These are Lisp_Misc_Ptr and PVEC_OTHER,
   which are both vectorlike objects.  The former
   is suitable for stashing a pointer in a Lisp object; the pointer
   might be to some low-level C object that contains auxiliary
   information.  The latter is useful for vector-like Lisp objects
   that need to be used as part of other objects, but which are never
   shown to users or Lisp code (search for PVEC_OTHER in xterm.c for
   an example).

   These two types don't look pretty when printed, so they are
   unsuitable for Lisp objects that can be exposed to users.

   To define a new data type, add a pseudovector subtype by extending
   the pvec_type enumeration.  A pseudovector provides one or more
   slots for Lisp objects, followed by struct members that are
   accessible only from C.

   There is no way to explicitly free a Lisp Object; only the garbage
   collector frees them.

   For a new pseudovector, it's highly desirable to limit the size
   of your data type by VBLOCK_BYTES_MAX bytes (defined in alloc.c).
   Otherwise you will need to change sweep_vectors (also in alloc.c).

   Then you will need to add switch branches in print.c (in
   print_object, to print your object, and possibly also in
   print_preprocess) and to alloc.c, to mark your object (in
   mark_object) and to free it (in gc_sweep).  The latter is also the
   right place to call any code specific to your data type that needs
   to run when the object is recycled -- e.g., free any additional
   resources allocated for it that are not Lisp objects.  You can even
   make a pointer to the function that frees the resources a slot in
   your object -- this way, the same object could be used to represent
   several disparate C structures.

   In addition, you need to add switch branches in data.c for Fcl_type_of
   and `cl--define-builtin-type` in lisp/emacs-lisp/cl-preloaded.el.  */


/* A Lisp_Object is a tagged pointer or integer.  Ordinarily it is a
   Lisp_Word.  However, if CHECK_LISP_OBJECT_TYPE, it is a wrapper
   around Lisp_Word, to help catch thinkos like 'Lisp_Object x = 0;'.

   LISP_INITIALLY (W) initializes a Lisp object with a tagged value
   that is a Lisp_Word W.  It can be used in a static initializer.  */

#ifdef CHECK_LISP_OBJECT_TYPE
typedef struct Lisp_Object { Lisp_Word i; } Lisp_Object;
# define LISP_OBJECT_IS_STRUCT
# define LISP_INITIALLY(w) {w}
# undef CHECK_LISP_OBJECT_TYPE
enum CHECK_LISP_OBJECT_TYPE { CHECK_LISP_OBJECT_TYPE = true };
#else
typedef Lisp_Word Lisp_Object;
# define LISP_INITIALLY(w) (w)
enum CHECK_LISP_OBJECT_TYPE { CHECK_LISP_OBJECT_TYPE = false };
#endif
\f
/* Forward declarations.  */

/* Defined in this file.  */
INLINE void set_sub_char_table_contents (Lisp_Object, ptrdiff_t,
					      Lisp_Object);

/* Defined in bignum.c.  */
extern int check_int_nonnegative (Lisp_Object);
extern intmax_t check_integer_range (Lisp_Object, intmax_t, intmax_t);
extern double bignum_to_double (Lisp_Object) ATTRIBUTE_CONST;
extern Lisp_Object make_bigint (intmax_t);
extern Lisp_Object make_biguint (uintmax_t);
extern uintmax_t check_uinteger_max (Lisp_Object, uintmax_t);

/* Defined in chartab.c.  */
extern Lisp_Object char_table_ref (Lisp_Object, int) ATTRIBUTE_PURE;
extern void char_table_set (Lisp_Object, int, Lisp_Object);

/* Defined in data.c.  */
extern AVOID args_out_of_range_3 (Lisp_Object, Lisp_Object, Lisp_Object);
extern AVOID wrong_type_argument (Lisp_Object, Lisp_Object);
extern Lisp_Object default_value (Lisp_Object symbol);
extern void defalias (Lisp_Object symbol, Lisp_Object definition);
extern char *fixnum_to_string (EMACS_INT number, char *buffer, char *end);


/* Defined in emacs.c.  */

/* Set after Emacs has started up the first time.
   Prevents reinitialization of the Lisp world and keymaps on
   subsequent starts.  */
extern bool initialized;

extern struct gflags
{
  /* True means this Emacs instance was born to dump.  */
  bool will_dump_ : 1;
  bool will_bootstrap_ : 1;
#ifdef HAVE_PDUMPER
  /* Set in an Emacs process that will likely dump with pdumper; all
     Emacs processes may dump with pdumper, however.  */
  bool will_dump_with_pdumper_ : 1;
  /* Set in an Emacs process that has been restored from a portable
     dump.  */
  bool dumped_with_pdumper_ : 1;
#endif
#ifdef HAVE_UNEXEC
  bool will_dump_with_unexec_ : 1;
  /* Set in an Emacs process that has been restored from an unexec
     dump.  */
  bool dumped_with_unexec_ : 1;
  /* We promise not to unexec: useful for hybrid malloc.  */
  bool will_not_unexec_ : 1;
#endif
} gflags;

INLINE bool
will_dump_p (void)
{
#if HAVE_PDUMPER || defined HAVE_UNEXEC
  return gflags.will_dump_;
#else
  return false;
#endif
}

INLINE bool
will_bootstrap_p (void)
{
#if HAVE_PDUMPER || defined HAVE_UNEXEC
  return gflags.will_bootstrap_;
#else
  return false;
#endif
}

INLINE bool
will_dump_with_pdumper_p (void)
{
#if HAVE_PDUMPER
  return gflags.will_dump_with_pdumper_;
#else
  return false;
#endif
}

INLINE bool
dumped_with_pdumper_p (void)
{
#if HAVE_PDUMPER
  return gflags.dumped_with_pdumper_;
#else
  return false;
#endif
}

INLINE bool
will_dump_with_unexec_p (void)
{
#ifdef HAVE_UNEXEC
  return gflags.will_dump_with_unexec_;
#else
  return false;
#endif
}

INLINE bool
dumped_with_unexec_p (void)
{
#ifdef HAVE_UNEXEC
  return gflags.dumped_with_unexec_;
#else
  return false;
#endif
}

/* This function is the opposite of will_dump_with_unexec_p(), except
   that it returns false before main runs.  It's important to use
   gmalloc for any pre-main allocations if we're going to unexec.  */
INLINE bool
definitely_will_not_unexec_p (void)
{
#ifdef HAVE_UNEXEC
  return gflags.will_not_unexec_;
#else
  return true;
#endif
}

/* Defined in floatfns.c.  */
extern double extract_float (Lisp_Object);

\f
/* Low-level conversion and type checking.  */

/* Convert among various types use to implement Lisp_Object.  At the
   machine level, these operations may widen or narrow their arguments
   if pointers differ in width from EMACS_INT; otherwise they are
   no-ops.  */

INLINE EMACS_INT
(XLI) (Lisp_Object o)
{
  return lisp_h_XLI (o);
}

INLINE Lisp_Object
(XIL) (EMACS_INT i)
{
  return lisp_h_XIL (i);
}

INLINE void *
(XLP) (Lisp_Object o)
{
  return lisp_h_XLP (o);
}

/* Extract A's type.  */

INLINE enum Lisp_Type
(XTYPE) (Lisp_Object a)
{
#if USE_LSB_TAG
  return lisp_h_XTYPE (a);
#else
  EMACS_UINT i = XLI (a);
  return USE_LSB_TAG ? i & ~VALMASK : i >> VALBITS;
#endif
}

/* True if A has type tag TAG.
   Equivalent to XTYPE (a) == TAG, but often faster.  */

INLINE bool
(TAGGEDP) (Lisp_Object a, enum Lisp_Type tag)
{
  return lisp_h_TAGGEDP (a, tag);
}

INLINE void
(CHECK_TYPE) (int ok, Lisp_Object predicate, Lisp_Object x)
{
  lisp_h_CHECK_TYPE (ok, predicate, x);
}

/* Extract A's pointer value, assuming A's Lisp type is TYPE and the
   extracted pointer's type is CTYPE *.  When !USE_LSB_TAG this simply
   extracts A's low-order bits, as (uintptr_t) LISP_WORD_TAG (type) is
   always zero then.  */
#define XUNTAG(a, type, ctype) \
  ((ctype *) ((uintptr_t) XLP (a) - (uintptr_t) LISP_WORD_TAG (type)))

/* A forwarding pointer to a value.  It uses a generic pointer to
   avoid alignment bugs that could occur if it used a pointer to a
   union of the possible values (struct Lisp_Objfwd, struct
   Lisp_Intfwd, etc.).  The pointer is packaged inside a struct to
   help static checking.  */
typedef const struct Lisp_Fwd *lispfwd;
\f
/* Interned state of a symbol.  */

enum symbol_interned
{
  SYMBOL_UNINTERNED,		      /* not interned anywhere */
  SYMBOL_INTERNED,		      /* interned but not in initial obarray */
  SYMBOL_INTERNED_IN_INITIAL_OBARRAY  /* interned in initial obarray */
};

enum symbol_redirect
{
  SYMBOL_PLAINVAL,   /* plain var, value is in the `value' field */
  SYMBOL_VARALIAS,   /* var alias, value is really in the `alias' symbol */
  SYMBOL_LOCALIZED,  /* localized var, value is in the `blv' object */
  SYMBOL_FORWARDED   /* forwarding var, value is in `forward' */
};

enum symbol_trapped_write
{
  SYMBOL_UNTRAPPED_WRITE,  /* normal case, just set the value */
  SYMBOL_NOWRITE,          /* constant, cannot set, e.g. nil, t, :keyword */
  SYMBOL_TRAPPED_WRITE     /* trap the write, call watcher functions */
};

struct Lisp_Symbol
{
  GC_HEADER
  union
  {
    struct
    {
      bool_bf gcmarkbit : 1;

      /* Indicates where the value can be found.  */
      ENUM_BF (symbol_redirect) redirect : 2;

      ENUM_BF (symbol_trapped_write) trapped_write : 2;

      /* Interned state of the symbol.  */
      ENUM_BF (symbol_interned) interned : 2;

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

      /* True if pointed to from purespace and hence can't be GC'd.  */
      bool_bf pinned : 1;

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

      /* Value of the symbol or Qunbound if unbound.  Which alternative of the
	 union is used depends on the `redirect' field above.  */
      union {
	Lisp_Object value;
	struct Lisp_Symbol *alias;
	struct Lisp_Buffer_Local_Value *blv;
	lispfwd fwd;
      } val;

      /* Function value of the symbol or Qnil 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;
    } s;
    GCALIGNED_UNION_MEMBER
  } u;
};
static_assert (GCALIGNED (struct Lisp_Symbol));

/* 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

/* Note that the weird token-substitution semantics of ANSI C makes
   this work for MANY and UNEVALLED.  */
#define DEFUN_ARGS_MANY		(ptrdiff_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)

/* Lisp_Word_tag is big enough for a possibly-shifted tag, to be
   added to a pointer value for conversion to a Lisp_Word.  */
#if LISP_WORDS_ARE_POINTERS
typedef uintptr_t Lisp_Word_tag;
#else
typedef EMACS_UINT Lisp_Word_tag;
#endif

/* A integer value tagged with TAG, and otherwise all zero.  */
#define LISP_WORD_TAG(tag) \
  ((Lisp_Word_tag) (tag) << (USE_LSB_TAG ? 0 : VALBITS))

/* An initializer for a Lisp_Object that contains TAG along with P.
   P can be a pointer or an integer.  The result is usable in a static
   initializer if TAG and P are both integer constant expressions.  */
#define TAG_PTR_INITIALLY(tag, p) \
  LISP_INITIALLY ((Lisp_Word) ((uintptr_t) (p) + LISP_WORD_TAG (tag)))

/* LISPSYM_INITIALLY (Qfoo) is equivalent to Qfoo except it is
   designed for use as a (possibly static) initializer.  */
#define LISPSYM_INITIALLY(name) \
  TAG_PTR_INITIALLY (Lisp_Symbol, (intptr_t) ((i##name) * sizeof *lispsym))

/* Declare extern constants for Lisp symbols.  These can be helpful
   when using a debugger like GDB, on older platforms where the debug
   format does not represent C macros.  However, they are unbounded
   and would just be asking for trouble if checking pointer bounds.  */
#define DEFINE_LISP_SYMBOL(name) \
  DEFINE_GDB_SYMBOL_BEGIN (Lisp_Object, name) \
  DEFINE_GDB_SYMBOL_END (LISPSYM_INITIALLY (name))

/* The index of the C-defined Lisp symbol SYM.
   This can be used in a static initializer.  */
#define SYMBOL_INDEX(sym) i##sym

/* By default, define macros for Qt, etc., as this leads to a bit
   better performance in the core Emacs interpreter.  A plugin can
   define DEFINE_NON_NIL_Q_SYMBOL_MACROS to be false, to be portable to
   other Emacs instances that assign different values to Qt, etc.  */
#ifndef DEFINE_NON_NIL_Q_SYMBOL_MACROS
# define DEFINE_NON_NIL_Q_SYMBOL_MACROS true
#endif

/* True if N is a power of 2.  N should be positive.  */

#define POWER_OF_2(n) (((n) & ((n) - 1)) == 0)

/* Return X rounded to the next multiple of Y.  Y should be positive,
   and Y - 1 + X should not overflow.  Arguments should not have side
   effects, as they are evaluated more than once.  Tune for Y being a
   power of 2.  */

#define ROUNDUP(x, y) (POWER_OF_2 (y)					\
                       ? ((y) - 1 + (x)) & ~ ((y) - 1)			\
                       : ((y) - 1 + (x)) - ((y) - 1 + (x)) % (y))

#include <globals.h>

/* Header of vector-like objects.  This documents the layout constraints on
   vectors and pseudovectors (objects of PVEC_xxx subtype).  It also prevents
   compilers from being fooled by Emacs's type punning: XSETPSEUDOVECTOR
   and PSEUDOVECTORP cast their pointers to struct vectorlike_header *,
   because when two such pointers potentially alias, a compiler won't
   incorrectly reorder loads and stores to their size fields.  See
   Bug#8546.   */
struct vectorlike_header
  {
    /* The `size' header word, W bits wide, has one of two forms
       discriminated by the second-highest bit (PSEUDOVECTOR_FLAG):

         1   1                    W-2
       +---+---+-------------------------------------+
       | M | 0 |                 SIZE                |  vector
       +---+---+-------------------------------------+

         1   1    W-32      6       12         12
       +---+---+--------+------+----------+----------+
       | M | 1 | unused | TYPE | RESTSIZE | LISPSIZE |  pseudovector
       +---+---+--------+------+----------+----------+

       M (ARRAY_MARK_FLAG) holds the GC mark bit.

       SIZE     is the length (number of slots) of a regular Lisp vector,
                and the object layout is struct Lisp_Vector.

       TYPE     is the pseudovector subtype (enum pvec_type).

       LISPSIZE is the number of Lisp_Object fields at the beginning of the
                object (after the header).  These are always traced by the GC.

       RESTSIZE is the number of fields (in word_size units) following.
                These are not automatically traced by the GC.
                For PVEC_BOOL and statically allocated PVEC_SUBR, RESTSIZE is 0.
                (The block size for PVEC_BOOL is computed from its own size
                field, to avoid being restricted by the 12-bit RESTSIZE field.)
    */
    GC_HEADER
    ptrdiff_t size;
  };

struct Lisp_Symbol_With_Pos
{
  struct vectorlike_header header;
  Lisp_Object sym;              /* A symbol */
  Lisp_Object pos;              /* A fixnum */
} GCALIGNED_STRUCT;

/* In the size word of a vector, this bit means the vector has been marked.  */

DEFINE_GDB_SYMBOL_BEGIN (ptrdiff_t, ARRAY_MARK_FLAG)
# define ARRAY_MARK_FLAG PTRDIFF_MIN
DEFINE_GDB_SYMBOL_END (ARRAY_MARK_FLAG)

/* In the size word of a struct Lisp_Vector, this bit means it's really
   some other vector-like object.  */
DEFINE_GDB_SYMBOL_BEGIN (ptrdiff_t, PSEUDOVECTOR_FLAG)
# define PSEUDOVECTOR_FLAG (PTRDIFF_MAX - PTRDIFF_MAX / 2)
DEFINE_GDB_SYMBOL_END (PSEUDOVECTOR_FLAG)

/* In a pseudovector, the size field actually contains a word with one
   PSEUDOVECTOR_FLAG bit set, and one of the following values extracted
   with PVEC_TYPE_MASK to indicate the actual type.  */
enum pvec_type
{
  PVEC_NORMAL_VECTOR, /* Should be first, for sxhash_obj.  */
  PVEC_FREE,
  PVEC_BIGNUM,
  PVEC_MARKER,
  PVEC_OVERLAY,
  PVEC_FINALIZER,
  PVEC_SYMBOL_WITH_POS,
  PVEC_MISC_PTR,
  PVEC_USER_PTR,
  PVEC_PROCESS,
  PVEC_FRAME,
  PVEC_WINDOW,
  PVEC_BOOL_VECTOR,
  PVEC_BUFFER,
  PVEC_HASH_TABLE,
#ifdef HAVE_MPS
  PVEC_WEAK_HASH_TABLE,
#endif
  PVEC_OBARRAY,
  PVEC_TERMINAL,
  PVEC_WINDOW_CONFIGURATION,
  PVEC_SUBR,
  PVEC_OTHER,            /* Should never be visible to Elisp code.  */
  PVEC_XWIDGET,
  PVEC_XWIDGET_VIEW,
  PVEC_THREAD,
  PVEC_MUTEX,
  PVEC_CONDVAR,
  PVEC_MODULE_FUNCTION,
  PVEC_MODULE_GLOBAL_REFERENCE,
  PVEC_NATIVE_COMP_UNIT,
  PVEC_TS_PARSER,
  PVEC_TS_NODE,
  PVEC_TS_COMPILED_QUERY,
  PVEC_SQLITE,

  /* These should be last, for internal_equal and sxhash_obj.  */
  PVEC_CLOSURE,
  PVEC_CHAR_TABLE,
  PVEC_SUB_CHAR_TABLE,
  PVEC_RECORD,
  PVEC_FONT,
  PVEC_TAG_MAX = PVEC_FONT  /* Keep this equal to the highest member.  */
};

enum More_Lisp_Bits
  {
    /* 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 GC).
       The distinction is used, e.g., by Lisp_Process, which places extra
       non-Lisp_Object fields at the end of the structure.  */
    PSEUDOVECTOR_SIZE_BITS = 12,
    PSEUDOVECTOR_SIZE_MASK = (1 << PSEUDOVECTOR_SIZE_BITS) - 1,

    /* To calculate the memory footprint of the pseudovector, it's useful
       to store the size of non-Lisp area in word_size units here.  */
    PSEUDOVECTOR_REST_BITS = 12,
    PSEUDOVECTOR_REST_MASK = (((1 << PSEUDOVECTOR_REST_BITS) - 1)
			      << PSEUDOVECTOR_SIZE_BITS),

    /* Used to extract pseudovector subtype information.  */
    PSEUDOVECTOR_AREA_BITS = PSEUDOVECTOR_SIZE_BITS + PSEUDOVECTOR_REST_BITS,
    PVEC_TYPE_MASK = 0x3f << PSEUDOVECTOR_AREA_BITS
  };
\f
/* These functions 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.  */

/* Largest and smallest representable fixnum values.  These are the C
   values.  They are macros for use in #if and static initializers.  */
#define MOST_POSITIVE_FIXNUM (EMACS_INT_MAX >> INTTYPEBITS)
#define MOST_NEGATIVE_FIXNUM (-1 - MOST_POSITIVE_FIXNUM)
\f
INLINE bool
PSEUDOVECTORP (Lisp_Object a, int code)
{
  return (lisp_h_VECTORLIKEP (a)
	  && ((XUNTAG (a, Lisp_Vectorlike, struct vectorlike_header)->size
	       & (PSEUDOVECTOR_FLAG | PVEC_TYPE_MASK))
	      == (PSEUDOVECTOR_FLAG | (code << PSEUDOVECTOR_AREA_BITS))));
}

INLINE bool
(BARE_SYMBOL_P) (Lisp_Object x)
{
  return lisp_h_BARE_SYMBOL_P (x);
}

INLINE bool
(SYMBOL_WITH_POS_P) (Lisp_Object x)
{
  return lisp_h_SYMBOL_WITH_POS_P (x);
}

INLINE bool
SYMBOLP (Lisp_Object x)
{
  return (BARE_SYMBOL_P (x)
	  || (symbols_with_pos_enabled && SYMBOL_WITH_POS_P (x)));
}

INLINE struct Lisp_Symbol_With_Pos *
XSYMBOL_WITH_POS (Lisp_Object a)
{
  eassert (SYMBOL_WITH_POS_P (a));

  struct Lisp_Symbol_With_Pos *s
    = XUNTAG (a, Lisp_Vectorlike, struct Lisp_Symbol_With_Pos);
  igc_check_fwd (s, false);
  return s;
}

INLINE Lisp_Object
XSYMBOL_WITH_POS_SYM (Lisp_Object a)
{
  Lisp_Object sym = XSYMBOL_WITH_POS (a)->sym;
  eassume (BARE_SYMBOL_P (sym));
  return sym;
}

INLINE Lisp_Object
XSYMBOL_WITH_POS_POS (Lisp_Object a)
{
  return XSYMBOL_WITH_POS (a)->pos;
}

INLINE Lisp_Object
maybe_remove_pos_from_symbol (Lisp_Object x)
{
  return (symbols_with_pos_enabled && SYMBOL_WITH_POS_P (x)
	  ? XSYMBOL_WITH_POS_SYM (x) : x);
}

INLINE struct Lisp_Symbol * ATTRIBUTE_NO_SANITIZE_UNDEFINED
XBARE_SYMBOL (Lisp_Object a)
{
  eassert (BARE_SYMBOL_P (a));
  intptr_t i = (intptr_t) XUNTAG (a, Lisp_Symbol, struct Lisp_Symbol);
  void *p = (char *) lispsym + i;
  igc_check_fwd (p, false);
  return p;
}

INLINE struct Lisp_Symbol * ATTRIBUTE_NO_SANITIZE_UNDEFINED
XSYMBOL (Lisp_Object a)
{
  if (!BARE_SYMBOL_P (a))
    {
      eassume (symbols_with_pos_enabled);
      a = XSYMBOL_WITH_POS_SYM (a);
    }
  return XBARE_SYMBOL (a);
}

/* Internal use only.  */
INLINE Lisp_Object
make_lisp_symbol_internal (struct Lisp_Symbol *sym)
{
  /* GCC 7 x86-64 generates faster code if lispsym is
     cast to char * rather than to intptr_t.
     Do not use eassert here, so that builtin symbols like Qnil compile to
     constants; this is needed for some circa-2024 GCCs even with -O2.  */
  char *symoffset = (char *) ((char *) sym - (char *) lispsym);
  Lisp_Object a = TAG_PTR_INITIALLY (Lisp_Symbol, symoffset);
  return a;
}

INLINE Lisp_Object
make_lisp_symbol (struct Lisp_Symbol *sym)
{
  Lisp_Object a = make_lisp_symbol_internal (sym);
  eassert (XBARE_SYMBOL (a) == sym);
  return a;
}

INLINE Lisp_Object
builtin_lisp_symbol (int index)
{
  return make_lisp_symbol_internal (&lispsym[index]);
}

INLINE bool
c_symbol_p (struct Lisp_Symbol *sym)
{
  char *bp = (char *) lispsym;
  char *sp = (char *) sym;
  if (PTRDIFF_MAX < INTPTR_MAX)
    return bp <= sp && sp < bp + sizeof lispsym;
  else
    {
      ptrdiff_t offset = sp - bp;
      return 0 <= offset && offset < sizeof lispsym;
    }
}

INLINE void
(CHECK_SYMBOL) (Lisp_Object x)
{
  lisp_h_CHECK_SYMBOL (x);
}

/* True if the possibly-unsigned integer I doesn't fit in a fixnum.  */

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

#if USE_LSB_TAG

INLINE Lisp_Object
(make_fixnum) (EMACS_INT n)
{
  eassert (!FIXNUM_OVERFLOW_P (n));
  return lisp_h_make_fixnum_wrap (n);
}

INLINE EMACS_INT
(XFIXNUM_RAW) (Lisp_Object a)
{
  return lisp_h_XFIXNUM_RAW (a);
}

INLINE Lisp_Object
make_ufixnum (EMACS_INT n)
{
  eassert (0 <= n && n <= INTMASK);
  return lisp_h_make_fixnum_wrap (n);
}

#else /* ! USE_LSB_TAG */

/* Although compiled only if ! USE_LSB_TAG, the following functions
   also work when USE_LSB_TAG; this is to aid future maintenance when
   the lisp_h_* macros are eventually removed.  */

/* Make a fixnum representing the value of the low order bits of N.  */
INLINE Lisp_Object
make_fixnum (EMACS_INT n)
{
  eassert (! FIXNUM_OVERFLOW_P (n));
  EMACS_INT int0 = Lisp_Int0;
  if (USE_LSB_TAG)
    {
      EMACS_UINT u = n;
      n = u << INTTYPEBITS;
      n += int0;
    }
  else
    {
      n &= INTMASK;
      n += (int0 << VALBITS);
    }
  return XIL (n);
}

/* Extract A's value as a signed integer.  Unlike XFIXNUM, this works
   on any Lisp object, although the resulting integer is useful only
   for things like hashing when A is not a fixnum.  */
INLINE EMACS_INT
XFIXNUM_RAW (Lisp_Object a)
{
  EMACS_INT i = XLI (a);
  if (! USE_LSB_TAG)
    {
      EMACS_UINT u = i;
      i = u << INTTYPEBITS;
    }
  return i >> INTTYPEBITS;
}

INLINE Lisp_Object
make_ufixnum (EMACS_INT n)
{
  eassert (0 <= n && n <= INTMASK);
  EMACS_INT int0 = Lisp_Int0;
  if (USE_LSB_TAG)
    {
      EMACS_UINT u = n;
      n = u << INTTYPEBITS;
      n += int0;
    }
  else
    n += int0 << VALBITS;
  return XIL (n);
}

#endif /* ! USE_LSB_TAG */

INLINE bool
(FIXNUMP) (Lisp_Object x)
{
  return lisp_h_FIXNUMP (x);
}

INLINE EMACS_INT
XFIXNUM (Lisp_Object a)
{
  eassert (FIXNUMP (a));
  return XFIXNUM_RAW (a);
}

/* Extract A's value as an unsigned integer in the range 0..INTMASK.  */
INLINE EMACS_UINT
XUFIXNUM_RAW (Lisp_Object a)
{
  EMACS_UINT i = XLI (a);
  return USE_LSB_TAG ? i >> INTTYPEBITS : i & INTMASK;
}
INLINE EMACS_UINT
XUFIXNUM (Lisp_Object a)
{
  eassert (FIXNUMP (a));
  return XUFIXNUM_RAW (a);
}

/* Return A's hash, which is in the range 0..INTMASK.  */
#ifndef HAVE_MPS
INLINE EMACS_INT
(XHASH) (Lisp_Object a)
{
  return lisp_h_XHASH (a);
}
#endif

/* Like make_fixnum (N), but may be faster.  N must be in nonnegative range.  */
INLINE Lisp_Object
make_fixed_natnum (EMACS_INT n)
{
  eassert (0 <= n && n <= MOST_POSITIVE_FIXNUM);
  EMACS_INT int0 = Lisp_Int0;
  return USE_LSB_TAG ? make_fixnum (n) : XIL (n + (int0 << VALBITS));
}

/* Return true if X and Y are the same object.  */
INLINE bool
(BASE_EQ) (Lisp_Object x, Lisp_Object y)
{
  return lisp_h_BASE_EQ (x, y);
}

/* Return true if X and Y are the same object, reckoning a symbol with
   position as being the same as the bare symbol.  */
INLINE bool
EQ (Lisp_Object x, Lisp_Object y)
{
  return BASE_EQ ((symbols_with_pos_enabled && SYMBOL_WITH_POS_P (x)
		   ? XSYMBOL_WITH_POS_SYM (x) : x),
		  (symbols_with_pos_enabled && SYMBOL_WITH_POS_P (y)
		   ? XSYMBOL_WITH_POS_SYM (y) : y));
}

INLINE intmax_t
clip_to_bounds (intmax_t lower, intmax_t num, intmax_t upper)
{
  return num < lower ? lower : num <= upper ? num : upper;
}
\f
/* Construct a Lisp_Object from a value or address.  */

INLINE Lisp_Object
make_lisp_ptr (void *ptr, enum Lisp_Type type)
{
  Lisp_Object a = TAG_PTR_INITIALLY (type, ptr);
  eassert (TAGGEDP (a, type) && XUNTAG (a, type, char) == ptr);
  return a;
}

#define XSETINT(a, b) ((a) = make_fixnum (b))
#define XSETFASTINT(a, b) ((a) = make_fixed_natnum (b))
#define XSETCONS(a, b) ((a) = make_lisp_ptr (b, Lisp_Cons))
#define XSETVECTOR(a, b) ((a) = make_lisp_ptr (b, Lisp_Vectorlike))
#define XSETSTRING(a, b) ((a) = make_lisp_ptr (b, Lisp_String))
#define XSETSYMBOL(a, b) ((a) = make_lisp_symbol (b))
#define XSETFLOAT(a, b) ((a) = make_lisp_ptr (b, Lisp_Float))

/* Return a Lisp_Object value that does not correspond to any object.
   This can make some Lisp objects on free lists recognizable in O(1).  */

INLINE Lisp_Object
dead_object (void)
{
  return make_lisp_ptr (NULL, Lisp_String);
}

/* Pseudovector types.  */

#define XSETPVECTYPE(v, code)						\
  ((v)->header.size |= PSEUDOVECTOR_FLAG | ((code) << PSEUDOVECTOR_AREA_BITS))
#define PVECHEADERSIZE(code, lispsize, restsize) \
  (PSEUDOVECTOR_FLAG | ((code) << PSEUDOVECTOR_AREA_BITS) \
   | ((restsize) << PSEUDOVECTOR_SIZE_BITS) | (lispsize))
#define XSETPVECTYPESIZE(v, code, lispsize, restsize)		\
  ((v)->header.size = PVECHEADERSIZE (code, lispsize, restsize))

/* The cast to struct vectorlike_header * avoids aliasing issues.  */
#define XSETPSEUDOVECTOR(a, b, code) \
  XSETTYPED_PSEUDOVECTOR (a, b,					\
			  (XUNTAG (a, Lisp_Vectorlike,		\
				   struct vectorlike_header)	\
			   ->size),				\
			  code)
#define XSETTYPED_PSEUDOVECTOR(a, b, size, code)			\
  (XSETVECTOR (a, b),							\
   eassert ((size & (PSEUDOVECTOR_FLAG | PVEC_TYPE_MASK))		\
	    == (PSEUDOVECTOR_FLAG | (code << PSEUDOVECTOR_AREA_BITS))))

#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) XSETPSEUDOVECTOR (a, b, PVEC_SUBR)
#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)
#define XSETTHREAD(a, b) XSETPSEUDOVECTOR (a, b, PVEC_THREAD)
#define XSETMUTEX(a, b) XSETPSEUDOVECTOR (a, b, PVEC_MUTEX)
#define XSETCONDVAR(a, b) XSETPSEUDOVECTOR (a, b, PVEC_CONDVAR)
#define XSETNATIVE_COMP_UNIT(a, b) XSETPSEUDOVECTOR (a, b, PVEC_NATIVE_COMP_UNIT)

/* Efficiently convert a pointer to a Lisp object and back.  The
   pointer is represented as a fixnum, so the garbage collector
   does not know about it.  The pointer should not have both Lisp_Int1
   bits set, which makes this conversion inherently unportable.  */

INLINE void *
XFIXNUMPTR (Lisp_Object a)
{
  return XUNTAG (a, Lisp_Int0, char);
}

INLINE Lisp_Object
make_pointer_integer_unsafe (void *p)
{
  Lisp_Object a = TAG_PTR_INITIALLY (Lisp_Int0, p);
  return a;
}

INLINE Lisp_Object
make_pointer_integer (void *p)
{
  Lisp_Object a = make_pointer_integer_unsafe (p);
  eassert (FIXNUMP (a) && XFIXNUMPTR (a) == p);
  return a;
}

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

typedef struct interval *INTERVAL;

struct Lisp_Cons
{
  GC_HEADER
  union
  {
    struct
    {
      /* Car of this cons cell.  */
      Lisp_Object car;

      union
      {
	/* Cdr of this cons cell.  */
	Lisp_Object cdr;

	/* Used to chain conses on a free list.  */
	struct Lisp_Cons *chain;
      } u;
    } s;
    GCALIGNED_UNION_MEMBER
  } u;
};
static_assert (GCALIGNED (struct Lisp_Cons));

INLINE bool
(NILP) (Lisp_Object x)
{
  return lisp_h_NILP (x);
}

INLINE bool
(CONSP) (Lisp_Object x)
{
  return lisp_h_CONSP (x);
}

INLINE void
CHECK_CONS (Lisp_Object x)
{
  CHECK_TYPE (CONSP (x), Qconsp, x);
}

INLINE struct Lisp_Cons *
XCONS (Lisp_Object a)
{
  eassert (CONSP (a));
  struct Lisp_Cons *c = XUNTAG (a, Lisp_Cons, struct Lisp_Cons);
  igc_check_fwd (c, false);
  return c;
}

/* Take the car or cdr of something known to be a cons cell.  */
/* The _addr functions 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.  (What if we want to switch to
   a copying collector someday?  Cached cons cell field addresses may be
   invalidated at arbitrary points.)  */
INLINE Lisp_Object *
xcar_addr (Lisp_Object c)
{
  return &XCONS (c)->u.s.car;
}
INLINE Lisp_Object *
xcdr_addr (Lisp_Object c)
{
  return &XCONS (c)->u.s.u.cdr;
}

/* Use these from normal code.  */

INLINE Lisp_Object
(XCAR) (Lisp_Object c)
{
  return lisp_h_XCAR (c);
}

INLINE Lisp_Object
(XCDR) (Lisp_Object c)
{
  return lisp_h_XCDR (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.  */
INLINE void
XSETCAR (Lisp_Object c, Lisp_Object n)
{
  *xcar_addr (c) = n;
}
INLINE void
XSETCDR (Lisp_Object c, Lisp_Object n)
{
  *xcdr_addr (c) = n;
}

/* Take the car or cdr of something whose type is not known.  */
INLINE Lisp_Object
CAR (Lisp_Object c)
{
  if (CONSP (c))
    return XCAR (c);
  if (!NILP (c))
    wrong_type_argument (Qlistp, c);
  return Qnil;
}
INLINE Lisp_Object
CDR (Lisp_Object c)
{
  if (CONSP (c))
    return XCDR (c);
  if (!NILP (c))
    wrong_type_argument (Qlistp, c);
  return Qnil;
}

/* Take the car or cdr of something whose type is not known.  */
INLINE Lisp_Object
CAR_SAFE (Lisp_Object c)
{
  return CONSP (c) ? XCAR (c) : Qnil;
}
INLINE Lisp_Object
CDR_SAFE (Lisp_Object c)
{
  return CONSP (c) ? XCDR (c) : Qnil;
}

#ifdef HAVE_MPS
/* When using MPS, Lisp_String data is actually a pointer to the
   flexible "data" array in this struct. */
struct Lisp_String_Data
{
  GC_HEADER
  unsigned char data[FLEXIBLE_ARRAY_MEMBER];
};
#endif

/* In a string or vector, the sign bit of u.s.size is the gc mark bit.  */

struct Lisp_String
{
  GC_HEADER
  union
  {
    struct
    {
      /* Number of characters in string; MSB is used as the mark bit.  */
      ptrdiff_t size;
      /* If nonnegative, number of bytes in the string (which is multibyte).
	 If negative, the string is unibyte:
	 -1 for data normally allocated
	 -2 for data in rodata (C string constants)
	 -3 for data that must be immovable (used for bytecode)  */
      ptrdiff_t size_byte;

      INTERVAL intervals;	/* Text properties in this string.  */
      unsigned char *data;
    } s;
    struct Lisp_String *next;
    GCALIGNED_UNION_MEMBER
  } u;
};
static_assert (GCALIGNED (struct Lisp_String));

INLINE bool
STRINGP (Lisp_Object x)
{
  return TAGGEDP (x, Lisp_String);
}

INLINE void
CHECK_STRING (Lisp_Object x)
{
  CHECK_TYPE (STRINGP (x), Qstringp, x);
}

INLINE struct Lisp_String *
XSTRING (Lisp_Object a)
{
  eassert (STRINGP (a));
  struct Lisp_String *s = XUNTAG (a, Lisp_String, struct Lisp_String);
  igc_check_fwd (s, false);
  return s;
}

/* True if STR is a multibyte string.  */
INLINE bool
STRING_MULTIBYTE (Lisp_Object str)
{
  return 0 <= XSTRING (str)->u.s.size_byte;
}

/* An upper bound on the number of bytes in a Lisp string, not
   counting the terminating null.  This a tight enough bound to
   prevent integer overflow errors that would otherwise occur during
   string size calculations.  A string cannot contain more bytes than
   a fixnum can represent, nor can it be so long that C pointer
   arithmetic stops working on the string plus its terminating null.
   Although the actual size limit (see STRING_BYTES_MAX in alloc.c)
   may be a bit smaller than STRING_BYTES_BOUND, calculating it here
   would expose alloc.c internal details that we'd rather keep
   private.

   This is a macro for use in static initializers.  The cast to
   ptrdiff_t ensures that the macro is signed.  */
#define STRING_BYTES_BOUND  \
  ((ptrdiff_t) min (MOST_POSITIVE_FIXNUM, min (SIZE_MAX, PTRDIFF_MAX) - 1))

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

/* Mark STR as a multibyte string.  Assure that STR contains only
   ASCII characters in advance.  */
INLINE void
STRING_SET_MULTIBYTE (Lisp_Object str)
{
  /* The 0-length strings are unique&shared so we can't modify them.  */
  eassert (XSTRING (str)->u.s.size > 0);
  XSTRING (str)->u.s.size_byte = XSTRING (str)->u.s.size;
}

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

/* WARNING: Use the 'char *' pointers to string data with care in code
   that could GC: GC can relocate string data, invalidating such
   pointers.  It is best to use string character or byte index
   instead, delaying the access through SDATA/SSDATA pointers to the
   latest possible moment.  If you must use the 'char *' pointers
   (e.g., for speed), be sure to adjust them after any call that could
   potentially GC.  */

INLINE unsigned char *
SDATA (Lisp_Object string)
{
  return XSTRING (string)->u.s.data;
}
INLINE char *
SSDATA (Lisp_Object string)
{
  /* Avoid "differ in sign" warnings.  */
  return (char *) SDATA (string);
}
INLINE unsigned char
SREF (Lisp_Object string, ptrdiff_t index)
{
  return SDATA (string)[index];
}
INLINE void
SSET (Lisp_Object string, ptrdiff_t index, unsigned char new)
{
  SDATA (string)[index] = new;
}
INLINE ptrdiff_t
SCHARS (Lisp_Object string)
{
  ptrdiff_t nchars = XSTRING (string)->u.s.size;
  eassume (0 <= nchars);
  return nchars;
}

#ifdef GC_CHECK_STRING_BYTES
extern ptrdiff_t string_bytes (struct Lisp_String *);
#endif
INLINE ptrdiff_t
STRING_BYTES (struct Lisp_String *s)
{
#if defined GC_CHECK_STRING_BYTES && !defined HAVE_MPS
  ptrdiff_t nbytes = string_bytes (s);
#else
  ptrdiff_t nbytes = s->u.s.size_byte < 0 ? s->u.s.size : s->u.s.size_byte;
#endif
  eassume (0 <= nbytes);
  return nbytes;
}

INLINE ptrdiff_t
SBYTES (Lisp_Object string)
{
  return STRING_BYTES (XSTRING (string));
}
INLINE void
STRING_SET_CHARS (Lisp_Object string, ptrdiff_t newsize)
{
  /* This function cannot change the size of data allocated for the
     string when it was created.  */
  eassert (STRING_MULTIBYTE (string)
	   ? 0 <= newsize && newsize <= SBYTES (string)
	   : newsize == SCHARS (string));
  XSTRING (string)->u.s.size = newsize;
}

INLINE void
CHECK_STRING_NULL_BYTES (Lisp_Object string)
{
  CHECK_TYPE (memchr (SSDATA (string), '\0', SBYTES (string)) == NULL,
	      Qfilenamep, string);
}

/* True if STR is immovable (whose data won't move during GC).  */
INLINE bool
string_immovable_p (Lisp_Object str)
{
  return XSTRING (str)->u.s.size_byte == -3;
}

/* A regular vector is just a header plus an array of Lisp_Objects.  */

struct Lisp_Vector
  {
    struct vectorlike_header header;
    Lisp_Object contents[FLEXIBLE_ARRAY_MEMBER];
  } GCALIGNED_STRUCT;

INLINE bool
(VECTORLIKEP) (Lisp_Object x)
{
  return lisp_h_VECTORLIKEP (x);
}

INLINE struct Lisp_Vector *
XVECTOR (Lisp_Object a)
{
  eassert (VECTORLIKEP (a));
  struct Lisp_Vector *v = XUNTAG (a, Lisp_Vectorlike, struct Lisp_Vector);
  igc_check_fwd (v, true);
  return v;
}

INLINE ptrdiff_t
ASIZE (Lisp_Object array)
{
  ptrdiff_t size = XVECTOR (array)->header.size;
  eassume (0 <= size);
  return size;
}

INLINE ptrdiff_t
gc_asize (Lisp_Object array)
{
  /* Like ASIZE, but also can be used in the garbage collector.  */
  return XVECTOR (array)->header.size & ~ARRAY_MARK_FLAG;
}

INLINE ptrdiff_t
PVSIZE (Lisp_Object pv)
{
  return ASIZE (pv) & PSEUDOVECTOR_SIZE_MASK;
}

INLINE bool
VECTORP (Lisp_Object x)
{
  return VECTORLIKEP (x) && ! (ASIZE (x) & PSEUDOVECTOR_FLAG);
}

INLINE void
CHECK_VECTOR (Lisp_Object x)
{
  CHECK_TYPE (VECTORP (x), Qvectorp, x);
}


/* A pseudovector is like a vector, but has other non-Lisp components.  */

INLINE enum pvec_type
PSEUDOVECTOR_TYPE (const struct Lisp_Vector *v)
{
  ptrdiff_t size = v->header.size;
  return (size & PSEUDOVECTOR_FLAG
          ? (size & PVEC_TYPE_MASK) >> PSEUDOVECTOR_AREA_BITS
          : PVEC_NORMAL_VECTOR);
}

/* Can't be used with PVEC_NORMAL_VECTOR.  */
INLINE bool
PSEUDOVECTOR_TYPEP (const struct vectorlike_header *a, enum pvec_type code)
{
  /* We don't use PSEUDOVECTOR_TYPE here so as to avoid a shift
   * operation when `code' is known.  */
  return ((a->size & (PSEUDOVECTOR_FLAG | PVEC_TYPE_MASK))
	  == (PSEUDOVECTOR_FLAG | (code << PSEUDOVECTOR_AREA_BITS)));
}

/* A boolvector is a kind of vectorlike, with contents 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 vectorlike_header header;
    /* The size in bits; at most BOOL_VECTOR_LENGTH_MAX.  */
    EMACS_INT size;
    /* The actual bits, packed into bytes.
       Zeros fill out the last word if needed.
       The bits are in little-endian order in the bytes, and
       the bytes are in little-endian order in the words.  */
    bits_word data[FLEXIBLE_ARRAY_MEMBER];
  } GCALIGNED_STRUCT;

/* Some handy constants for calculating sizes
   and offsets, mostly of vectorlike objects.

   The garbage collector assumes that the initial part of any struct
   that starts with a struct vectorlike_header followed by N
   Lisp_Objects (some possibly in arrays and/or a trailing flexible
   array) will be laid out like a struct Lisp_Vector with N
   Lisp_Objects.  This assumption is true in practice on known Emacs
   targets even though the C standard does not guarantee it.  This
   header contains a few sanity checks that should suffice to detect
   violations of this assumption on plausible practical hosts.  */

enum
  {
    header_size = offsetof (struct Lisp_Vector, contents),
    bool_header_size = offsetof (struct Lisp_Bool_Vector, data),
    word_size = sizeof (Lisp_Object)
  };

/* A bool vector's length must be a fixnum for XFIXNUM (Flength (...)).
   Also, it is limited object size, which must fit in both ptrdiff_t and
   size_t including header overhead and trailing alignment.  */
#define BOOL_VECTOR_LENGTH_MAX \
  min (MOST_POSITIVE_FIXNUM, \
       ((INT_MULTIPLY_OVERFLOW (min (PTRDIFF_MAX, SIZE_MAX) - bool_header_size,\
				(EMACS_INT) BOOL_VECTOR_BITS_PER_CHAR) \
	 ? EMACS_INT_MAX \
	 : ((min (PTRDIFF_MAX, SIZE_MAX) - bool_header_size) \
	    * (EMACS_INT) BOOL_VECTOR_BITS_PER_CHAR)) \
	- (BITS_PER_BITS_WORD - 1)))

/* The number of data words and bytes in a bool vector with SIZE bits.  */

INLINE EMACS_INT
bool_vector_words (EMACS_INT size)
{
  eassume (0 <= size && size <= EMACS_INT_MAX - (BITS_PER_BITS_WORD - 1));
  return (size + (BITS_PER_BITS_WORD - 1)) / BITS_PER_BITS_WORD;
}

INLINE EMACS_INT
bool_vector_bytes (EMACS_INT size)
{
  eassume (0 <= size && size <= EMACS_INT_MAX - (BITS_PER_BITS_WORD - 1));
  return (size + (BOOL_VECTOR_BITS_PER_CHAR - 1)) / BOOL_VECTOR_BITS_PER_CHAR;
}

INLINE bits_word
bits_word_to_host_endian (bits_word val)
{
#ifndef WORDS_BIGENDIAN
  return val;
#else
  if (BITS_WORD_MAX >> 31 == 1)
    return bswap_32 (val);
  if (BITS_WORD_MAX >> 31 >> 31 >> 1 == 1)
    return bswap_64 (val);
  {
    int i;
    bits_word r = 0;
    for (i = 0; i < sizeof val; i++)
      {
	r = ((r << 1 << (CHAR_BIT - 1))
	     | (val & ((1u << 1 << (CHAR_BIT - 1)) - 1)));
	val = val >> 1 >> (CHAR_BIT - 1);
      }
    return r;
  }
#endif
}

INLINE bool
BOOL_VECTOR_P (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_BOOL_VECTOR);
}

INLINE void
CHECK_BOOL_VECTOR (Lisp_Object x)
{
  CHECK_TYPE (BOOL_VECTOR_P (x), Qbool_vector_p, x);
}

INLINE struct Lisp_Bool_Vector *
XBOOL_VECTOR (Lisp_Object a)
{
  eassert (BOOL_VECTOR_P (a));
  struct Lisp_Bool_Vector *v
    = XUNTAG (a, Lisp_Vectorlike, struct Lisp_Bool_Vector);
  igc_check_fwd (v, true);
  return v;
}

INLINE EMACS_INT
bool_vector_size (Lisp_Object a)
{
  EMACS_INT size = XBOOL_VECTOR (a)->size;
  eassume (0 <= size);
  return size;
}

INLINE bits_word *
bool_vector_data (Lisp_Object a)
{
  return XBOOL_VECTOR (a)->data;
}

INLINE unsigned char *
bool_vector_uchar_data (Lisp_Object a)
{
  return (unsigned char *) bool_vector_data (a);
}

/* True if A's Ith bit is set.  */

INLINE bool
bool_vector_bitref (Lisp_Object a, EMACS_INT i)
{
  eassume (0 <= i);
  eassert (i < bool_vector_size (a));
  return !! (bool_vector_uchar_data (a)[i / BOOL_VECTOR_BITS_PER_CHAR]
	     & (1 << (i % BOOL_VECTOR_BITS_PER_CHAR)));
}

INLINE Lisp_Object
bool_vector_ref (Lisp_Object a, EMACS_INT i)
{
  return bool_vector_bitref (a, i) ? Qt : Qnil;
}

/* Set A's Ith bit to B.  */

INLINE void
bool_vector_set (Lisp_Object a, EMACS_INT i, bool b)
{
  eassume (0 <= i);
  eassert (i < bool_vector_size (a));

  unsigned char *addr
    = &bool_vector_uchar_data (a)[i / BOOL_VECTOR_BITS_PER_CHAR];
  if (b)
    *addr |= 1 << (i % BOOL_VECTOR_BITS_PER_CHAR);
  else
    *addr &= ~ (1 << (i % BOOL_VECTOR_BITS_PER_CHAR));
}

/* Conveniences for dealing with Lisp arrays.  */

INLINE Lisp_Object
AREF (Lisp_Object array, ptrdiff_t idx)
{
  eassert (0 <= idx && idx < gc_asize (array));
  return XVECTOR (array)->contents[idx];
}

INLINE Lisp_Object *
aref_addr (Lisp_Object array, ptrdiff_t idx)
{
  eassert (0 <= idx && idx <= gc_asize (array));
  return & XVECTOR (array)->contents[idx];
}

INLINE void
ASET (Lisp_Object array, ptrdiff_t idx, Lisp_Object val)
{
  eassert (0 <= idx && idx < ASIZE (array));
  XVECTOR (array)->contents[idx] = val;
}

INLINE void
gc_aset (Lisp_Object array, ptrdiff_t idx, Lisp_Object val)
{
  /* Like ASET, but also can be used in the garbage collector:
     sweep_weak_table calls set_hash_key etc. while the table is marked.  */
  eassert (0 <= idx && idx < gc_asize (array));
  XVECTOR (array)->contents[idx] = val;
}

/* True, since Qnil's representation is zero.  Every place in the code
   that assumes Qnil is zero should static_assert (NIL_IS_ZERO), to make
   it easy to find such assumptions later if we change Qnil to be
   nonzero.  Test iQnil and Lisp_Symbol instead of Qnil directly, since
   the latter is not suitable for use in an integer constant
   expression.  */
enum { NIL_IS_ZERO = iQnil == 0 && Lisp_Symbol == 0 };

/* Clear the object addressed by P, with size NBYTES, so that all its
   bytes are zero and all its Lisp values are nil.  */
INLINE void
memclear (void *p, ptrdiff_t nbytes)
{
  eassert (0 <= nbytes);
  static_assert (NIL_IS_ZERO);
  /* Since Qnil is zero, memset suffices.  */
  memset (p, 0, nbytes);
}

/* 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) - header_size + word_size - 1) / word_size)

/* 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, lastlispfield)				\
  (offsetof (type, lastlispfield) + word_size < header_size		\
   ? 0 : (offsetof (type, lastlispfield) + word_size - header_size) / word_size)

/* True iff C is an ASCII character.  */
INLINE bool
ASCII_CHAR_P (intmax_t c)
{
  return 0 <= c && c < 0x80;
}

/* A char-table is a kind of vectorlike, with contents like a vector,
   but with a few additional slots.  For some purposes, it makes sense
   to handle a char-table as type 'struct Lisp_Vector'.  An element of
   a char-table can be any Lisp object, but if it is a sub-char-table,
   we treat it as a table that contains information of a specific
   range of characters.  A sub-char-table is like a vector, but with
   two integer fields between the header and Lisp data, which means
   that it has to be marked with some precautions (see mark_char_table
   in alloc.c).  A sub-char-table appears in an element of a char-table.  */

enum CHARTAB_SIZE_BITS
  {
    CHARTAB_SIZE_BITS_0 = 6,
    CHARTAB_SIZE_BITS_1 = 4,
    CHARTAB_SIZE_BITS_2 = 5,
    CHARTAB_SIZE_BITS_3 = 7
  };

extern const int chartab_size[4];

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 vectorlike_header header;

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

    /* This points to another char table, from which we inherit 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 in the range 0..127.  It
       is nil if no 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[FLEXIBLE_ARRAY_MEMBER];
  } GCALIGNED_STRUCT;

INLINE bool
CHAR_TABLE_P (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_CHAR_TABLE);
}

INLINE struct Lisp_Char_Table *
XCHAR_TABLE (Lisp_Object a)
{
  eassert (CHAR_TABLE_P (a));
  struct Lisp_Char_Table *t = XUNTAG (a, Lisp_Vectorlike, struct Lisp_Char_Table);
  igc_check_fwd (t, true);
  return t;
}

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 vectorlike_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.  */
    int depth;

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

    /* Use set_sub_char_table_contents to set this.  */
    Lisp_Object contents[FLEXIBLE_ARRAY_MEMBER];
  } GCALIGNED_STRUCT;

INLINE bool
SUB_CHAR_TABLE_P (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_SUB_CHAR_TABLE);
}

INLINE struct Lisp_Sub_Char_Table *
XSUB_CHAR_TABLE (Lisp_Object a)
{
  eassert (SUB_CHAR_TABLE_P (a));
  return XUNTAG (a, Lisp_Vectorlike, struct Lisp_Sub_Char_Table);
}

INLINE Lisp_Object
CHAR_TABLE_REF_ASCII (Lisp_Object ct, ptrdiff_t idx)
{
  for (struct Lisp_Char_Table *tbl = XCHAR_TABLE (ct); ;
       tbl = XCHAR_TABLE (tbl->parent))
    {
      Lisp_Object val = (SUB_CHAR_TABLE_P (tbl->ascii)
			 ? XSUB_CHAR_TABLE (tbl->ascii)->contents[idx]
			 : tbl->ascii);
      if (NILP (val))
	val = tbl->defalt;
      if (!NILP (val) || NILP (tbl->parent))
	return val;
    }
}

/* Almost equivalent to Faref (CT, IDX) with optimization for ASCII
   characters.  Does not check validity of CT.  */
INLINE Lisp_Object
CHAR_TABLE_REF (Lisp_Object ct, int idx)
{
  return (ASCII_CHAR_P (idx)
	  ? CHAR_TABLE_REF_ASCII (ct, idx)
	  : char_table_ref (ct, idx));
}

/* Equivalent to Faset (CT, IDX, VAL) with optimization for ASCII and
   8-bit European characters.  Does not check validity of CT.  */
INLINE void
CHAR_TABLE_SET (Lisp_Object ct, int idx, Lisp_Object val)
{
  if (ASCII_CHAR_P (idx) && SUB_CHAR_TABLE_P (XCHAR_TABLE (ct)->ascii))
    set_sub_char_table_contents (XCHAR_TABLE (ct)->ascii, idx, val);
  else
    char_table_set (ct, idx, val);
}

#include "comp.h"

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

struct Lisp_Subr
  {
    struct vectorlike_header header;
    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) (ptrdiff_t, Lisp_Object *);
    } function;
    short min_args, max_args;
    const char *symbol_name;
    union {
      const char *string;
      Lisp_Object native;
    } intspec;
    Lisp_Object command_modes;
    EMACS_INT doc;
#ifdef HAVE_NATIVE_COMP
    Lisp_Object native_comp_u;
    char *native_c_name;
    Lisp_Object lambda_list;
    Lisp_Object type;
#endif
  } GCALIGNED_STRUCT;
union Aligned_Lisp_Subr
  {
    struct Lisp_Subr s;
    GCALIGNED_UNION_MEMBER
  };
static_assert (GCALIGNED (union Aligned_Lisp_Subr));

INLINE bool
SUBRP (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_SUBR);
}

INLINE struct Lisp_Subr *
XSUBR (Lisp_Object a)
{
  eassert (SUBRP (a));
  return &XUNTAG (a, Lisp_Vectorlike, union Aligned_Lisp_Subr)->s;
}

/* Return whether a value might be a valid docstring.
   Used to distinguish the presence of non-docstring in the docstring slot,
   as in the case of OClosures.  */
INLINE bool
VALID_DOCSTRING_P (Lisp_Object doc)
{
  return FIXNUMP (doc) || STRINGP (doc)
         || (CONSP (doc) && STRINGP (XCAR (doc)) && FIXNUMP (XCDR (doc)));
}

enum char_table_specials
  {
    /* 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.  */
    CHAR_TABLE_STANDARD_SLOTS
      = (PSEUDOVECSIZE (struct Lisp_Char_Table, contents) - 1
	 + (1 << CHARTAB_SIZE_BITS_0)),

    /* This is the index of the first Lisp_Object field in Lisp_Sub_Char_Table
       when the latter is treated as an ordinary Lisp_Vector.  */
    SUB_CHAR_TABLE_OFFSET
      = PSEUDOVECSIZE (struct Lisp_Sub_Char_Table, contents) - 1
  };

/* Sanity-check pseudovector layout.  */
static_assert (offsetof (struct Lisp_Char_Table, defalt) == header_size);
static_assert (offsetof (struct Lisp_Char_Table, extras)
	       == header_size + CHAR_TABLE_STANDARD_SLOTS * sizeof (Lisp_Object));
static_assert (offsetof (struct Lisp_Sub_Char_Table, contents)
	       == header_size + SUB_CHAR_TABLE_OFFSET * sizeof (Lisp_Object));

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

INLINE int
CHAR_TABLE_EXTRA_SLOTS (struct Lisp_Char_Table *ct)
{
  return ((ct->header.size & PSEUDOVECTOR_SIZE_MASK)
	  - CHAR_TABLE_STANDARD_SLOTS);
}


/* Save and restore the instruction and environment pointers,
   without affecting the signal mask.  */

#ifdef HAVE__SETJMP
typedef jmp_buf sys_jmp_buf;
# define sys_setjmp(j) _setjmp (j)
# define sys_longjmp(j, v) _longjmp (j, v)
#elif defined HAVE_SIGSETJMP
typedef sigjmp_buf sys_jmp_buf;
# define sys_setjmp(j) sigsetjmp (j, 0)
# define sys_longjmp(j, v) siglongjmp (j, v)
#else
/* A platform that uses neither _longjmp nor siglongjmp; assume
   longjmp does not affect the sigmask.  */
typedef jmp_buf sys_jmp_buf;
# define sys_setjmp(j) setjmp (j)
# define sys_longjmp(j, v) longjmp (j, v)
#endif

#include "thread.h"

/***********************************************************************
			       Symbols
 ***********************************************************************/

/* Value is name of symbol.  */

INLINE Lisp_Object
SYMBOL_VAL (struct Lisp_Symbol *sym)
{
  eassert (sym->u.s.redirect == SYMBOL_PLAINVAL);
  return sym->u.s.val.value;
}

INLINE struct Lisp_Symbol *
SYMBOL_ALIAS (struct Lisp_Symbol *sym)
{
  eassume (sym->u.s.redirect == SYMBOL_VARALIAS && sym->u.s.val.alias);
  return sym->u.s.val.alias;
}
INLINE struct Lisp_Buffer_Local_Value *
SYMBOL_BLV (struct Lisp_Symbol *sym)
{
  eassume (sym->u.s.redirect == SYMBOL_LOCALIZED && sym->u.s.val.blv);
  return sym->u.s.val.blv;
}
INLINE lispfwd
SYMBOL_FWD (struct Lisp_Symbol *sym)
{
  eassume (sym->u.s.redirect == SYMBOL_FORWARDED && sym->u.s.val.fwd);
  return sym->u.s.val.fwd;
}

INLINE void
SET_SYMBOL_VAL (struct Lisp_Symbol *sym, Lisp_Object v)
{
  eassert (sym->u.s.redirect == SYMBOL_PLAINVAL);
  sym->u.s.val.value = v;
}

INLINE void
SET_SYMBOL_ALIAS (struct Lisp_Symbol *sym, struct Lisp_Symbol *v)
{
  eassume (sym->u.s.redirect == SYMBOL_VARALIAS && v);
  sym->u.s.val.alias = v;
}
INLINE void
SET_SYMBOL_BLV (struct Lisp_Symbol *sym, struct Lisp_Buffer_Local_Value *v)
{
  eassume (sym->u.s.redirect == SYMBOL_LOCALIZED && v);
  sym->u.s.val.blv = v;
}
INLINE void
SET_SYMBOL_FWD (struct Lisp_Symbol *sym, lispfwd fwd)
{
  eassume (sym->u.s.redirect == SYMBOL_FORWARDED && fwd);
  sym->u.s.val.fwd = fwd;
}

INLINE Lisp_Object
SYMBOL_NAME (Lisp_Object sym)
{
  return XSYMBOL (sym)->u.s.name;
}

/* Value is true if SYM is an interned symbol.  */

INLINE bool
SYMBOL_INTERNED_P (Lisp_Object sym)
{
  return XSYMBOL (sym)->u.s.interned != SYMBOL_UNINTERNED;
}

/* Value is true if SYM is interned in initial_obarray.  */

INLINE bool
SYMBOL_INTERNED_IN_INITIAL_OBARRAY_P (Lisp_Object sym)
{
  return XSYMBOL (sym)->u.s.interned == SYMBOL_INTERNED_IN_INITIAL_OBARRAY;
}

/* Value is non-zero if symbol cannot be changed through a simple set,
   i.e. it's a constant (e.g. nil, t, :keywords), or it has some
   watching functions.  */

INLINE int
(SYMBOL_TRAPPED_WRITE_P) (Lisp_Object sym)
{
  return lisp_h_SYMBOL_TRAPPED_WRITE_P (sym);
}

/* Value is non-zero if symbol cannot be changed at all, i.e. it's a
   constant (e.g. nil, t, :keywords).  Code that actually wants to
   write to SYM, should also check whether there are any watching
   functions.  */

INLINE int
(SYMBOL_CONSTANT_P) (Lisp_Object sym)
{
  return lisp_h_SYMBOL_CONSTANT_P (sym);
}

/* Placeholder for make-docfile to process.  The actual symbol
   definition is done by lread.c's define_symbol.  */
#define DEFSYM(sym, name) /* empty */


struct Lisp_Obarray
{
  struct vectorlike_header header;

  /* Array of 2**size_bits values, each being either a (bare) symbol or
     the fixnum 0.  The symbols for each bucket are chained via
     their s.next field.  */
  Lisp_Object *buckets;

  unsigned size_bits;  /* log2(size of buckets vector) */
  unsigned count;      /* number of symbols in obarray */
};

INLINE bool
OBARRAYP (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_OBARRAY);
}

INLINE struct Lisp_Obarray *
XOBARRAY (Lisp_Object a)
{
  eassert (OBARRAYP (a));
  struct Lisp_Obarray *o = XUNTAG (a, Lisp_Vectorlike, struct Lisp_Obarray);
# if defined HAVE_MPS && defined ENABLE_CHECKING
  igc_check_fwd (o, true);
# endif
  return o;
}

INLINE void
CHECK_OBARRAY (Lisp_Object x)
{
  CHECK_TYPE (OBARRAYP (x), Qobarrayp, x);
}

INLINE Lisp_Object
make_lisp_obarray (struct Lisp_Obarray *o)
{
  eassert (PSEUDOVECTOR_TYPEP (&o->header, PVEC_OBARRAY));
  return make_lisp_ptr (o, Lisp_Vectorlike);
}

INLINE ptrdiff_t
obarray_size (const struct Lisp_Obarray *o)
{
  return (ptrdiff_t)1 << o->size_bits;
}

Lisp_Object check_obarray_slow (Lisp_Object);

/* Return an obarray object from OBARRAY or signal an error.  */
INLINE Lisp_Object
check_obarray (Lisp_Object obarray)
{
  return OBARRAYP (obarray) ? obarray : check_obarray_slow (obarray);
}

/* Obarray iterator state.  Don't access these members directly.
   The iterator functions must be called in the order followed by DOOBARRAY.  */
typedef struct {
  struct Lisp_Obarray *o;
  ptrdiff_t idx;		/* Current bucket index.  */
  struct Lisp_Symbol *symbol;	/* Current symbol, or NULL if at end
				   of current bucket.  */
} obarray_iter_t;

INLINE obarray_iter_t
make_obarray_iter (struct Lisp_Obarray *oa)
{
  return (obarray_iter_t){.o = oa, .idx = -1, .symbol = NULL};
}

/* Whether IT has reached the end and there are no more symbols.
   If true, IT is dead and cannot be used any more.  */
INLINE bool
obarray_iter_at_end (obarray_iter_t *it)
{
  if (it->symbol)
    return false;
  ptrdiff_t size = obarray_size (it->o);
  while (++it->idx < size)
    {
      Lisp_Object obj = it->o->buckets[it->idx];
      if (!BASE_EQ (obj, make_fixnum (0)))
	{
	  it->symbol = XBARE_SYMBOL (obj);
	  return false;
	}
    }
  return true;
}

/* Advance IT to the next symbol if any.  */
INLINE void
obarray_iter_step (obarray_iter_t *it)
{
  it->symbol = it->symbol->u.s.next;
}

/* The Lisp symbol at IT, if obarray_iter_at_end returned false.  */
INLINE Lisp_Object
obarray_iter_symbol (obarray_iter_t *it)
{
  return make_lisp_symbol (it->symbol);
}

/* Iterate IT over the symbols of the obarray OA.
   The body shouldn't add or remove symbols in OA, but disobeying that rule
   only risks symbols to be iterated more than once or not at all,
   not crashes or data corruption.  */
#define DOOBARRAY(oa, it)					\
  for (obarray_iter_t it = make_obarray_iter (oa);		\
       !obarray_iter_at_end (&it); obarray_iter_step (&it))

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

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

struct Lisp_Weak_Hash_Table;
struct Lisp_Hash_Table;
struct hash_impl;

/* The type of a hash value stored in the table.
   It's unsigned and a subtype of EMACS_UINT.  */
typedef unsigned int hash_hash_t;

typedef enum {
  Test_eql,
  Test_eq,
  Test_equal,
} hash_table_std_test_t;

struct hash_table_test
{
  /* C function to compute hash code.  */
  hash_hash_t (*hashfn) (Lisp_Object, struct Lisp_Hash_Table *);

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

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

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

  /* Function used to compare keys; always a bare symbol.  */
  Lisp_Object name;
};

typedef enum {
  Weak_None,		 /* No weak references.  */
  Weak_Key,		 /* Reference to key is weak.  */
  Weak_Value,		 /* Reference to value is weak.  */
  Weak_Key_Or_Value,	 /* References to key or value are weak:
			    element kept as long as strong reference to
			    either key or value remains.  */
  Weak_Key_And_Value,	 /* References to key and value are weak:
			    element kept as long as strong references to
			    both key and value remain.  */
} hash_table_weakness_t;

/* The type of a hash table index, both for table indices and index
   (hash) indices.  It's signed and a subtype of ptrdiff_t.  */
typedef int32_t hash_idx_t;

/* The reason for this unusual structure is an MPS peculiarity on 32-bit x86 systems. */
struct Lisp_Weak_Hash_Table_Entry
{
  EMACS_UINT intptr; /* must be an MPS base pointer */
  Lisp_Object fixnum; /* a fixnum indicating the tag, or just a fixnum */
};

extern Lisp_Object weak_hash_table_entry (struct Lisp_Weak_Hash_Table_Entry entry);
extern struct Lisp_Weak_Hash_Table_Entry make_weak_hash_table_entry (Lisp_Object);

struct Lisp_Weak_Hash_Table_Strong_Part
{
  GC_HEADER
  Lisp_Object index_bits;
  Lisp_Object next_free;
  Lisp_Object table_size;
  struct Lisp_Weak_Hash_Table_Weak_Part *weak;
  const struct hash_table_test *test;
  struct Lisp_Weak_Hash_Table_Entry *index; /* internal pointer to an all-fixnum array */
  struct Lisp_Weak_Hash_Table_Entry *hash; /* internal pointer to an all-fixnum array */
  struct Lisp_Weak_Hash_Table_Entry *next; /* internal pointer to an all-fixnum array */
  struct Lisp_Weak_Hash_Table_Entry *key; /* either internal pointer or pointer to dependent object */
  struct Lisp_Weak_Hash_Table_Entry *value; /* either internal pointer or pointer to dependent object */
  hash_table_weakness_t weakness : 3;
  hash_table_std_test_t frozen_test : 2;

  /* True if the table can be purecopied.  The table cannot be
     changed afterwards.  */
  bool_bf purecopy : 1;

  /* True if the table is mutable.  Ordinarily tables are mutable, but
     pure tables are not, and while a table is being mutated it is
     immutable for recursive attempts to mutate it.  */
  bool_bf mutable : 1;
  struct Lisp_Weak_Hash_Table_Entry entries[FLEXIBLE_ARRAY_MEMBER];
};

struct Lisp_Weak_Hash_Table_Weak_Part
{
  GC_HEADER
  struct Lisp_Weak_Hash_Table_Strong_Part *strong;
  struct Lisp_Weak_Hash_Table_Entry entries[FLEXIBLE_ARRAY_MEMBER];
};

struct Lisp_Weak_Hash_Table
{
  struct vectorlike_header header;

  struct Lisp_Weak_Hash_Table_Strong_Part *strong;
  struct Lisp_Weak_Hash_Table_Weak_Part *weak;
  Lisp_Object dump_replacement;
};

struct Lisp_Hash_Table
{
  struct vectorlike_header header;

  /* Hash table internal structure:

     Lisp key         index                  table
         |            vector
         | hash fn                  hash    key   value  next
         v             +--+       +------+-------+------+----+
     hash value        |-1|       | C351 |  cow  | moo  | -1 |<-
         |             +--+       +------+-------+------+----+  |
          ------------>| -------->| 07A8 |  cat  | meow | -1 |  |
            range      +--+       +------+-------+------+----+  |
          reduction    |-1|     ->| 91D2 |  dog  | woof |   ----
                       +--+    |  +------+-------+------+----+
                       | ------   |  ?   |unbound|  ?   | -1 |<-
                       +--+       +------+-------+------+----+  |
                       | -------->| F6B0 | duck  |quack | -1 |  |
                       +--+       +------+-------+------+----+  |
                       |-1|     ->|  ?   |unbound|  ?   |   ----
                       +--+    |  +------+-------+------+----+
                       :  :    |  :      :       :     :    :
                               |
                           next_free

     The table is physically split into three vectors (hash, next,
     key_and_value) which may or may not be beneficial.  */

  /* Bucket vector.  An entry of -1 indicates no item is present,
     and a nonnegative entry is the index of the first item in
     a collision chain.
     This vector is 2**index_bits entries long.
     If index_bits is 0 (and table_size is 0), then this is the
     constant read-only vector {-1}, shared between all instances.
     Otherwise it is heap-allocated.  */
  hash_idx_t *index;

  /* Vector of hash codes.  Unused entries have undefined values.
     This vector is table_size entries long.  */
  hash_hash_t *hash;

  /* Vectors of keys and values.  If the key is HASH_UNUSED_ENTRY_KEY,
     then this slot is unused.  This is gc_marked specially if the table
     is weak.  */
  Lisp_Object *key;
  Lisp_Object *value;

  /* The comparison and hash functions.  */
  const struct hash_table_test *test;

  /* 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,
     or -1 if there is no such entry.
     This vector is table_size entries long.  */
  hash_idx_t *next;

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

  /* Index of first free entry in free list, or -1 if none.  */
  hash_idx_t next_free;

  hash_idx_t table_size;   /* Size of the next and hash vectors.  */

  unsigned char index_bits;	/* log2 (size of the index vector).  */

  /* Weakness of the table.  */
  hash_table_weakness_t weakness : 3;

  /* Hash table test (only used when frozen in dump)  */
  hash_table_std_test_t frozen_test : 2;

  /* True if the table can be purecopied.  The table cannot be
     changed afterwards.  */
  bool_bf purecopy : 1;

  /* True if the table is mutable.  Ordinarily tables are mutable, but
     pure tables are not, and while a table is being mutated it is
     immutable for recursive attempts to mutate it.  */
  bool_bf mutable : 1;

  /* Next weak hash table if this is a weak hash table.  The head of
     the list is in weak_hash_tables.  Used only during garbage
     collection --- at other times, it is NULL.  */
  struct Lisp_Hash_Table *next_weak;
} GCALIGNED_STRUCT;

/* A specific Lisp_Object that is not a valid Lisp value.
   We need to be careful not to leak this value into machinery
   where it may be treated as one; we'd get a segfault if lucky.  */
#define INVALID_LISP_VALUE make_lisp_ptr (NULL, Lisp_Float)

/* Key value that marks an unused hash table entry.  */
#define HASH_UNUSED_ENTRY_KEY INVALID_LISP_VALUE

/* KEY is a key of an unused hash table entry.  */
INLINE bool
hash_unused_entry_key_p (Lisp_Object key)
{
  return BASE_EQ (key, HASH_UNUSED_ENTRY_KEY);
}

INLINE bool
HASH_TABLE_P (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_HASH_TABLE);
}

INLINE struct Lisp_Hash_Table *
XHASH_TABLE (Lisp_Object a)
{
  eassert (HASH_TABLE_P (a));
  struct Lisp_Hash_Table *h
    = XUNTAG (a, Lisp_Vectorlike, struct Lisp_Hash_Table);
  igc_check_fwd (h, true);
  return h;
}

#ifdef HAVE_MPS
INLINE bool
WEAK_HASH_TABLE_P (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_WEAK_HASH_TABLE);
}

INLINE struct Lisp_Weak_Hash_Table *
XWEAK_HASH_TABLE (Lisp_Object a)
{
  eassert (WEAK_HASH_TABLE_P (a));
  struct Lisp_Weak_Hash_Table *h
    = XUNTAG (a, Lisp_Vectorlike, struct Lisp_Weak_Hash_Table);
  igc_check_fwd (h, true);
  return h;
}
#endif

INLINE Lisp_Object
make_lisp_hash_table (struct Lisp_Hash_Table *h)
{
  eassert (PSEUDOVECTOR_TYPEP (&h->header, PVEC_HASH_TABLE));
  return make_lisp_ptr (h, Lisp_Vectorlike);
}

/* Value is the key part of entry IDX in hash table H.  */
INLINE Lisp_Object
HASH_KEY (const struct Lisp_Hash_Table *h, ptrdiff_t idx)
{
  eassert (idx >= 0 && idx < h->table_size);
  return h->key[idx];
}

/* Value is the value part of entry IDX in hash table H.  */
INLINE Lisp_Object
HASH_VALUE (const struct Lisp_Hash_Table *h, ptrdiff_t idx)
{
  eassert (idx >= 0 && idx < h->table_size);
  return h->value[idx];
}

/* Value is the hash code computed for entry IDX in hash table H.  */
INLINE hash_hash_t
HASH_HASH (const struct Lisp_Hash_Table *h, ptrdiff_t idx)
{
  eassert (idx >= 0 && idx < h->table_size);
  return h->hash[idx];
}

/* Value is the size of hash table H.  */
INLINE ptrdiff_t
HASH_TABLE_SIZE (const struct Lisp_Hash_Table *h)
{
  return h->table_size;
}

/* Size of the index vector in hash table H.  */
INLINE ptrdiff_t
hash_table_index_size (const struct Lisp_Hash_Table *h)
{
  return (ptrdiff_t)1 << h->index_bits;
}

/* Hash value for KEY in hash table H.  */
INLINE hash_hash_t
hash_from_key (struct Lisp_Hash_Table *h, Lisp_Object key)
{
  return h->test->hashfn (key, h);
}

#ifdef HAVE_MPS
INLINE Lisp_Object
make_lisp_weak_hash_table (struct Lisp_Weak_Hash_Table *h)
{
  eassert (PSEUDOVECTOR_TYPEP (&h->header, PVEC_WEAK_HASH_TABLE));
  return make_lisp_ptr (h, Lisp_Vectorlike);
}

/* Value is the key part of entry IDX in hash table H.  */
INLINE Lisp_Object
WEAK_HASH_KEY (const struct Lisp_Weak_Hash_Table *h, ptrdiff_t idx)
{
  eassert (idx >= 0 && idx < XFIXNUM (h->strong->table_size));
  return weak_hash_table_entry (h->strong->key[idx]);
}

INLINE Lisp_Object
WEAK_HASH_VALUE (const struct Lisp_Weak_Hash_Table *h, ptrdiff_t idx)
{
  return weak_hash_table_entry (h->strong->value[idx]);
}

/* Value is the hash code computed for entry IDX in hash table H.  */
INLINE Lisp_Object
WEAK_HASH_HASH (const struct Lisp_Weak_Hash_Table *h, ptrdiff_t idx)
{
  eassert (idx >= 0 && idx < XFIXNUM (h->strong->table_size));
  return weak_hash_table_entry (h->strong->hash[idx]);
}

/* Value is the size of hash table H.  */
INLINE ptrdiff_t
WEAK_HASH_TABLE_SIZE (const struct Lisp_Weak_Hash_Table *h)
{
  return XFIXNUM (h->strong->table_size);
}

INLINE ptrdiff_t
weak_hash_table_index_size (const struct Lisp_Weak_Hash_Table *h)
{
  return (ptrdiff_t)1 << XFIXNUM (h->strong->index_bits);
}

/* Hash value for KEY in hash table H.  */
extern Lisp_Object weak_hash_from_key (struct Lisp_Weak_Hash_Table *h, Lisp_Object key);
#endif

/* Iterate K and V as key and value of valid entries in hash table H.
   The body may remove the current entry or alter its value slot, but not
   mutate TABLE in any other way.  */
# define DOHASH(h, k, v)						\
  for (Lisp_Object *dohash_##k##_##v##_k = (h)->key,			\
		   *dohash_##k##_##v##_v = (h)->value,			\
                   *dohash_##k##_##v##_end = dohash_##k##_##v##_k	\
                                             + HASH_TABLE_SIZE (h),	\
	           *dohash_##k##_##v##_base = dohash_##k##_##v##_k,	\
                   k, v;						\
       dohash_##k##_##v##_k < dohash_##k##_##v##_end			\
	 && (k = dohash_##k##_##v##_k[0],				\
	     v = dohash_##k##_##v##_v[0], /*maybe unused*/ (void)v,	\
           true);			                                \
       eassert (dohash_##k##_##v##_base == (h)->key			\
		&& dohash_##k##_##v##_end				\
		   == dohash_##k##_##v##_base				\
		+ HASH_TABLE_SIZE (h)),					\
	 ++dohash_##k##_##v##_k, ++dohash_##k##_##v##_v)		\
    if (hash_unused_entry_key_p (k))					\
      ;									\
    else

/* Iterate K and V as key and value of valid entries in weak hash table H.
   The body may remove the current entry or alter its value slot, but not
   mutate TABLE in any other way.  */
# define DOHASH_WEAK(h, k, v)						\
  for (struct Lisp_Weak_Hash_Table_Entry *dohash_##k##_##v##_k = (h)->strong->key, \
	 *dohash_##k##_##v##_v = (h)->strong->value,			\
	 *dohash_##k##_##v##_end = dohash_##k##_##v##_k			\
	 + WEAK_HASH_TABLE_SIZE (h),					\
	 *dohash_##k##_##v##_base = dohash_##k##_##v##_k;		\
       dohash_##k##_##v##_k < dohash_##k##_##v##_end			\
	 && (k = weak_hash_table_entry (dohash_##k##_##v##_k[0]),	\
	     v = weak_hash_table_entry (dohash_##k##_##v##_v[0]),	\
           true);			                                \
       eassert (dohash_##k##_##v##_base == (h)->strong->key		\
		&& dohash_##k##_##v##_end				\
		   == dohash_##k##_##v##_base				\
		+ WEAK_HASH_TABLE_SIZE (h)),				\
	 ++dohash_##k##_##v##_k, ++dohash_##k##_##v##_v)		\
    if (hash_unused_entry_key_p (k))					\
      ;									\
    else if (PSEUDOVECTORP (k, PVEC_FREE) || PSEUDOVECTORP (v, PVEC_FREE)) \
      ;									\
    else

/* Iterate I as index of valid entries in hash table H.
   Unlike DOHASH, this construct copes with arbitrary table mutations
   in the body.  The consequences of such mutations are limited to
   whether and in what order entries are encountered by the loop
   (which is usually bad enough), but not crashing or corrupting the
   Lisp state.  */
#define DOHASH_SAFE(h, i)					\
  for (ptrdiff_t i = 0; i < HASH_TABLE_SIZE (h); i++)		\
    if (hash_unused_entry_key_p (HASH_KEY (h, i)))		\
      ;								\
    else

/* Iterate I as index of valid entries in weak hash table H.
   Unlike DOHASH, this construct copes with arbitrary table mutations
   in the body.  The consequences of such mutations are limited to
   whether and in what order entries are encountered by the loop
   (which is usually bad enough), but not crashing or corrupting the
   Lisp state.  */
#define DOHASH_WEAK_SAFE(h, i)					\
  for (ptrdiff_t i = 0; i < WEAK_HASH_TABLE_SIZE (h); i++)	\
    if (hash_unused_entry_key_p (WEAK_HASH_KEY (h, i)))		\
      ;								\
    else

void hash_table_thaw (Lisp_Object hash_table);
void hash_table_rehash (struct Lisp_Hash_Table *h);

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

enum DEFAULT_HASH_SIZE { DEFAULT_HASH_SIZE = 0 };

/* Combine two integers X and Y for hashing.  The result might exceed
   INTMASK.  */

INLINE EMACS_UINT
sxhash_combine (EMACS_UINT x, EMACS_UINT y)
{
  return (x << 4) + (x >> (EMACS_INT_WIDTH - 4)) + y;
}

/* Hash X, returning a value in the range 0..INTMASK.  */

INLINE EMACS_UINT
SXHASH_REDUCE (EMACS_UINT x)
{
  return (x ^ x >> (EMACS_INT_WIDTH - FIXNUM_BITS)) & INTMASK;
}

/* Reduce an EMACS_UINT hash value to hash_hash_t.  */
INLINE hash_hash_t
reduce_emacs_uint_to_hash_hash (EMACS_UINT x)
{
  static_assert (sizeof x <= 2 * sizeof (hash_hash_t));
  return (sizeof x == sizeof (hash_hash_t)
	  ? x
	  : x ^ (x >> (8 * (sizeof x - sizeof (hash_hash_t)))));
}

/* Reduce HASH to a value BITS wide.  */
INLINE ptrdiff_t
knuth_hash (hash_hash_t hash, unsigned bits)
{
  /* Knuth multiplicative hashing, tailored for 32-bit indices
     (avoiding a 64-bit multiply on typical platforms).  */
  unsigned int h = hash;
  unsigned int alpha = 2654435769;	/* 2**32/phi */
  /* Multiply with unsigned int, ANDing in case UINT_WIDTH exceeds 32.  */
  unsigned int product = (h * alpha) & 0xffffffffu;
  /* Convert to a wider type, so that the shift works when BITS == 0.  */
  unsigned long long int wide_product = product;
  return wide_product >> (32 - bits);
}


struct Lisp_Marker
{
  struct vectorlike_header header;

  /* 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;

  /* This flag is temporarily used in the functions
     decode/encode_coding_object to record that the marker position
     must be adjusted after the conversion.  */
  bool_bf need_adjustment : 1;
  /* True means normal insertion at the marker's position
     leaves the marker after the inserted text.  */
  bool_bf insertion_type : 1;

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

#ifndef HAVE_MPS
  /* For markers that point somewhere,
     this is used to chain of all the markers in a given buffer.
     The chain does not preserve markers from garbage collection;
     instead, markers are removed from the chain when freed by GC.  */
  /* We could remove it and use an array in buffer_text instead.
     That would also allow us to preserve it ordered.  */
  struct Lisp_Marker *next;
  /* This is the char position where the marker points.  */
#endif

  ptrdiff_t 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).  */
  ptrdiff_t bytepos;

# ifdef HAVE_MPS
  /* If in a buffer's marker vector, this is the index where it is
     stored. */
  ptrdiff_t index;
# endif
} GCALIGNED_STRUCT;

struct Lisp_Overlay
/* An overlay's real data content is:
   - plist
   - buffer
   - itree node
   - start buffer position (field of the itree node)
   - end buffer position (field of the itree node)
   - insertion types of both ends (fields of the itree node).  */
  {
    struct vectorlike_header header;
    Lisp_Object plist;
    struct buffer *buffer;        /* eassert (live buffer || NULL). */
    struct itree_node *interval;
  } GCALIGNED_STRUCT;

struct Lisp_Misc_Ptr
  {
    struct vectorlike_header header;
    void *pointer;
  } GCALIGNED_STRUCT;

extern Lisp_Object make_misc_ptr (void *);

/* A mint_ptr object OBJ represents a C-language pointer P efficiently.
   Preferably (and typically), OBJ is a fixnum I such that
   XFIXNUMPTR (I) == P, as this represents P within a single Lisp value
   without requiring any auxiliary memory.  However, if P would be
   damaged by being tagged as an integer and then untagged via
   XFIXNUMPTR, then OBJ is a Lisp_Misc_Ptr with pointer component P.

   mint_ptr objects are efficiency hacks intended for C code.
   Although xmint_ptr can be given any mint_ptr generated by non-buggy
   C code, it should not be given a mint_ptr generated from Lisp code
   as that would allow Lisp code to coin pointers from integers and
   could lead to crashes.  To package a C pointer into a Lisp-visible
   object you can put the pointer into a pseudovector instead; see
   Lisp_User_Ptr for an example.  */

INLINE Lisp_Object
make_mint_ptr (void *a)
{
  Lisp_Object val = TAG_PTR_INITIALLY (Lisp_Int0, a);
  return FIXNUMP (val) && XFIXNUMPTR (val) == a ? val : make_misc_ptr (a);
}

INLINE bool
mint_ptrp (Lisp_Object x)
{
  return FIXNUMP (x) || PSEUDOVECTORP (x, PVEC_MISC_PTR);
}

INLINE void *
xmint_pointer (Lisp_Object a)
{
  eassert (mint_ptrp (a));
  if (FIXNUMP (a))
    return XFIXNUMPTR (a);
  return XUNTAG (a, Lisp_Vectorlike, struct Lisp_Misc_Ptr)->pointer;
}

struct Lisp_Sqlite
{
  struct vectorlike_header header;
  void *db;
  void *stmt;
  char *name;
  void (*finalizer) (void *);
  bool eof;
  bool is_statement;
} GCALIGNED_STRUCT;

struct Lisp_User_Ptr
{
  struct vectorlike_header header;
  void (*finalizer) (void *);
  void *p;
} GCALIGNED_STRUCT;

/* A finalizer sentinel.  */
struct Lisp_Finalizer
  {
    struct vectorlike_header header;

    /* Call FUNCTION when the finalizer becomes unreachable, even if
       FUNCTION contains a reference to the finalizer; i.e., call
       FUNCTION when it is reachable _only_ through finalizers.  */
    Lisp_Object function;

    /* Circular list of all active weak references.  */
    struct Lisp_Finalizer *prev;
    struct Lisp_Finalizer *next;
  } GCALIGNED_STRUCT;

extern struct Lisp_Finalizer finalizers;
extern struct Lisp_Finalizer doomed_finalizers;
void unchain_finalizer (struct Lisp_Finalizer *finalizer);

INLINE bool
FINALIZERP (Lisp_Object x)
{
  return PSEUDOVECTORP (x, PVEC_FINALIZER);
}

INLINE struct Lisp_Finalizer *
XFINALIZER (Lisp_Object a)
{
  eassert (FINALIZERP (a));
  return XUNTAG (a, Lisp_Vectorlike, struct Lisp_Finalizer);
}

INLINE bool
MARKERP (Lisp_Object x)
{
  return PSEUDOVECTORP (x, PVEC_MARKER);
}

INLINE struct Lisp_Marker *
XMARKER (Lisp_Object a)
{
  eassert (MARKERP (a));
  struct Lisp_Marker *m = XUNTAG (a, Lisp_Vectorlike, struct Lisp_Marker);
  igc_check_fwd (m, true);
  return m;
}

INLINE bool
OVERLAYP (Lisp_Object x)
{
  return PSEUDOVECTORP (x, PVEC_OVERLAY);
}

INLINE struct Lisp_Overlay *
XOVERLAY (Lisp_Object a)
{
  eassert (OVERLAYP (a));
  struct Lisp_Overlay *o = XUNTAG (a, Lisp_Vectorlike, struct Lisp_Overlay);
  igc_check_fwd (o, true);
  return o;
}

INLINE bool
USER_PTRP (Lisp_Object x)
{
  return PSEUDOVECTORP (x, PVEC_USER_PTR);
}

INLINE struct Lisp_User_Ptr *
XUSER_PTR (Lisp_Object a)
{
  eassert (USER_PTRP (a));
  return XUNTAG (a, Lisp_Vectorlike, struct Lisp_User_Ptr);
}

INLINE bool
SQLITEP (Lisp_Object x)
{
  return PSEUDOVECTORP (x, PVEC_SQLITE);
}

INLINE bool
SQLITE (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_SQLITE);
}

INLINE void
CHECK_SQLITE (Lisp_Object x)
{
  CHECK_TYPE (SQLITE (x), Qsqlitep, x);
}

INLINE struct Lisp_Sqlite *
XSQLITE (Lisp_Object a)
{
  eassert (SQLITEP (a));
  return XUNTAG (a, Lisp_Vectorlike, struct Lisp_Sqlite);
}

INLINE bool
BIGNUMP (Lisp_Object x)
{
  return PSEUDOVECTORP (x, PVEC_BIGNUM);
}

INLINE bool
INTEGERP (Lisp_Object x)
{
  return FIXNUMP (x) || BIGNUMP (x);
}

/* Return a Lisp integer with value taken from N.  */
INLINE Lisp_Object
make_int (intmax_t n)
{
  return FIXNUM_OVERFLOW_P (n) ? make_bigint (n) : make_fixnum (n);
}
INLINE Lisp_Object
make_uint (uintmax_t n)
{
  return FIXNUM_OVERFLOW_P (n) ? make_biguint (n) : make_fixnum (n);
}

/* Return a Lisp integer equal to the value of the C integer EXPR.  */
#define INT_TO_INTEGER(expr) \
  (EXPR_SIGNED (expr) ? make_int (expr) : make_uint (expr))

\f
/* struct Lisp_Buffer_Local_Value is used in a symbol value cell when
   the symbol has buffer-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 `valcell' slot holds the variable's current value (unless `fwd'
   is set).  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) `valcell'.

   `where' is the buffer for which the loaded binding was found.
   If it has changed, to make sure the right binding is loaded it is
   necessary to find which binding goes with the current buffer, then
   load it.  To load it, first unload the previous 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
  {
    GC_HEADER
    /* True means that merely setting the variable creates a local
       binding for the current buffer.  */
    bool_bf local_if_set : 1;
    /* True means that the binding now loaded was found.
       Presumably equivalent to (defcell!=valcell).  */
    bool_bf found : 1;
    /* If non-NULL, a forwarding to the C var where it should also be set.  */
    lispfwd fwd;	/* Should never be (Buffer|Kboard)_Objfwd.  */
    /* The buffer 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 `fwd' is non-NULL, 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;
  };

enum Lisp_Fwd_Predicate
{
  FWDPRED_Qnil,
  FWDPRED_Qintegerp,
  FWDPRED_Qsymbolp,
  FWDPRED_Qstringp,
  FWDPRED_Qnumberp,
  FWDPRED_Qfraction,
  FWDPRED_Qvertical_scroll_bar,
  FWDPRED_Qoverwrite_mode,
};

/* A struct Lisp_Fwd is used to locate a variable.  See Lisp_Fwd_Type
   for the various types of variables.

   Lisp_Fwd structs are created by macros like DEFVAR_INT, DEFVAR_BOOL etc.
   and are always kept in static variables.  They are never allocated
   dynamically. */

struct Lisp_Fwd
{
  enum Lisp_Fwd_Type type : 8;
  union
  {
    intmax_t *intvar;
    bool *boolvar;
    Lisp_Object *objvar;
    struct
    {
      uint16_t offset;
      enum Lisp_Fwd_Predicate predicate : 8;
    } buf;
    int kbdoffset;
  } u;
};

INLINE enum Lisp_Fwd_Type
XFWDTYPE (lispfwd a)
{
  return a->type;
}

INLINE bool
BUFFER_OBJFWDP (lispfwd a)
{
  return XFWDTYPE (a) == Lisp_Fwd_Buffer_Obj;
}

INLINE int
XBUFFER_OFFSET (lispfwd a)
{
  eassert (BUFFER_OBJFWDP (a));
  return a->u.buf.offset;
}

INLINE bool
KBOARD_OBJFWDP (lispfwd a)
{
  return XFWDTYPE (a) == Lisp_Fwd_Kboard_Obj;
}

\f
/* Lisp floating point type.  */
struct Lisp_Float
{
  GC_HEADER
  int type;
  union
  {
    double data;
    struct Lisp_Float *chain;
    GCALIGNED_UNION_MEMBER
  } u;
};
static_assert (GCALIGNED (struct Lisp_Float));

INLINE bool
(FLOATP) (Lisp_Object x)
{
  return lisp_h_FLOATP (x);
}

INLINE struct Lisp_Float *
XFLOAT (Lisp_Object a)
{
  eassert (FLOATP (a));
  struct Lisp_Float *f = XUNTAG (a, Lisp_Float, struct Lisp_Float);
  igc_check_fwd (f, false);
  return f;
}

INLINE double
XFLOAT_DATA (Lisp_Object f)
{
  return XFLOAT (f)->u.data;
}

/* Most hosts nowadays use IEEE floating point, so they use IEC 60559
   representations, have infinities and NaNs, and do not trap on
   exceptions.  Define IEEE_FLOATING_POINT to 1 if this host is one of the
   typical ones.  The C23 macro __STDC_IEC_60559_BFP__ (or its
   obsolescent C11 counterpart __STDC_IEC_559__) is close to what is
   wanted here, but is not quite right because Emacs does not require
   all the features of C23 Annex F (and does not require C11 or later,
   for that matter).  */

#define IEEE_FLOATING_POINT (FLT_RADIX == 2 && FLT_MANT_DIG == 24 \
			     && FLT_MIN_EXP == -125 && FLT_MAX_EXP == 128)

/* Meanings of slots in a Lisp_Closure:  */

enum Lisp_Closure
  {
    CLOSURE_ARGLIST = 0,
    CLOSURE_CODE = 1,
    CLOSURE_CONSTANTS = 2,
    CLOSURE_STACK_DEPTH = 3,
    CLOSURE_DOC_STRING = 4,
    CLOSURE_INTERACTIVE = 5
  };

/* Flag bits in a character.  These also get used in termhooks.h.
   Emacs needs 22 bits for the character value itself, see MAX_CHAR,
   so we shouldn't use any bits lower than 0x0400000.  */
enum char_bits
  {
    CHAR_ALT = 0x0400000,
    CHAR_SUPER = 0x0800000,
    CHAR_HYPER = 0x1000000,
    CHAR_SHIFT = 0x2000000,
    CHAR_CTL = 0x4000000,
    CHAR_META = 0x8000000,

    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.  */
    CHARACTERBITS = 22
  };
\f
/* Data type checking.  */

INLINE bool
FIXNATP (Lisp_Object x)
{
  return FIXNUMP (x) && 0 <= XFIXNUM (x);
}

/* Like XFIXNUM (A), but may be faster.  A must be nonnegative.  */
INLINE EMACS_INT
XFIXNAT (Lisp_Object a)
{
  eassert (FIXNUMP (a));
  EMACS_INT int0 = Lisp_Int0;
  EMACS_INT result = USE_LSB_TAG ? XFIXNUM (a) : XLI (a) - (int0 << VALBITS);
  eassume (0 <= result);
  return result;
}

INLINE bool
NUMBERP (Lisp_Object x)
{
  return INTEGERP (x) || FLOATP (x);
}

INLINE bool
RANGED_FIXNUMP (intmax_t lo, Lisp_Object x, intmax_t hi)
{
  return FIXNUMP (x) && lo <= XFIXNUM (x) && XFIXNUM (x) <= hi;
}

#define TYPE_RANGED_FIXNUMP(type, x) \
  (FIXNUMP (x)			      \
   && (TYPE_SIGNED (type) ? TYPE_MINIMUM (type) <= XFIXNUM (x) : 0 <= XFIXNUM (x)) \
   && XFIXNUM (x) <= TYPE_MAXIMUM (type))

INLINE bool
AUTOLOADP (Lisp_Object x)
{
  return CONSP (x) && EQ (Qautoload, XCAR (x));
}


/* Test for specific pseudovector types.  */

INLINE bool
WINDOW_CONFIGURATIONP (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_WINDOW_CONFIGURATION);
}

INLINE bool
CLOSUREP (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_CLOSURE);
}

INLINE bool
FRAMEP (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_FRAME);
}

INLINE bool
RECORDP (Lisp_Object a)
{
  return PSEUDOVECTORP (a, PVEC_RECORD);
}

INLINE void
CHECK_RECORD (Lisp_Object x)
{
  CHECK_TYPE (RECORDP (x), Qrecordp, x);
}

/* Test for image (image . spec)  */
INLINE bool
IMAGEP (Lisp_Object x)
{
  return CONSP (x) && EQ (XCAR (x), Qimage);
}

/* Array types.  */
INLINE bool
ARRAYP (Lisp_Object x)
{
  return VECTORP (x) || STRINGP (x) || CHAR_TABLE_P (x) || BOOL_VECTOR_P (x);
}
\f
INLINE void
CHECK_LIST (Lisp_Object x)
{
  CHECK_TYPE (CONSP (x) || NILP (x), Qlistp, x);
}

INLINE void
CHECK_LIST_END (Lisp_Object x, Lisp_Object y)
{
  CHECK_TYPE (NILP (x), Qlistp, y);
}

INLINE void
(CHECK_FIXNUM) (Lisp_Object x)
{
  lisp_h_CHECK_FIXNUM (x);
}

INLINE void
CHECK_STRING_CAR (Lisp_Object x)
{
  CHECK_TYPE (STRINGP (XCAR (x)), Qstringp, XCAR (x));
}
/* This is a bit special because we always need size afterwards.  */
INLINE ptrdiff_t
CHECK_VECTOR_OR_STRING (Lisp_Object x)
{
  if (VECTORP (x))
    return ASIZE (x);
  if (STRINGP (x))
    return SCHARS (x);
  wrong_type_argument (Qarrayp, x);
}
INLINE void
CHECK_ARRAY (Lisp_Object x, Lisp_Object predicate)
{
  CHECK_TYPE (ARRAYP (x), predicate, x);
}
INLINE void
CHECK_FIXNAT (Lisp_Object x)
{
  CHECK_TYPE (FIXNATP (x), Qwholenump, x);
}

INLINE double
XFLOATINT (Lisp_Object n)
{
  return (FIXNUMP (n) ? XFIXNUM (n)
	  : FLOATP (n) ? XFLOAT_DATA (n)
	  : bignum_to_double (n));
}

INLINE void
CHECK_NUMBER (Lisp_Object x)
{
  CHECK_TYPE (NUMBERP (x), Qnumberp, x);
}

INLINE void
CHECK_INTEGER (Lisp_Object x)
{
  CHECK_TYPE (INTEGERP (x), Qintegerp, x);
}

INLINE void
CHECK_SUBR (Lisp_Object x)
{
  CHECK_TYPE (SUBRP (x), Qsubrp, x);
}
\f

/* If we're not dumping using the legacy dumper and we might be using
   the portable dumper, try to bunch all the subr structures together
   for more efficient dump loading.  */
#ifndef HAVE_UNEXEC
# ifdef DARWIN_OS
#  define SUBR_SECTION_ATTRIBUTE ATTRIBUTE_SECTION ("__DATA,subrs")
# else
#  define SUBR_SECTION_ATTRIBUTE ATTRIBUTE_SECTION (".subrs")
# endif
#else
# define SUBR_SECTION_ATTRIBUTE
#endif

/* 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 there are &rest arguments.  Here we 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.  (We also use
        this convention when calling a subr with more than 8 parameters.)
    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.  */
#ifdef HAVE_MPS
#define DEFUN(lname, fnname, sname, minargs, maxargs, intspec, doc)	\
  SUBR_SECTION_ATTRIBUTE						\
  static union Aligned_Lisp_Subr sname =				\
    { {	{ GC_HEADER_INIT						\
	  (PSEUDOVECTOR_FLAG | PVEC_SUBR << PSEUDOVECTOR_AREA_BITS) },	\
        { .a ## maxargs = fnname },					\
	minargs, maxargs, lname, {intspec}, lisp_h_Qnil}};		\
   Lisp_Object fnname
#else
#define DEFUN(lname, fnname, sname, minargs, maxargs, intspec, doc)	\
  SUBR_SECTION_ATTRIBUTE						\
  static union Aligned_Lisp_Subr sname =				\
    { {	{ GC_HEADER_INIT PVEC_SUBR << PSEUDOVECTOR_AREA_BITS },		\
        { .a ## maxargs = fnname },					\
	minargs, maxargs, lname, {intspec}, lisp_h_Qnil}};		\
   Lisp_Object fnname
#endif

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

enum maxargs
  {
    MANY = -2,
    UNEVALLED = -1
  };

/* Call a function F that accepts many args, passing it ARRAY's elements.  */
#define CALLMANY(f, array) (f) (ARRAYELTS (array), array)

/* Call a function F that accepts many args, passing it the remaining args,
   E.g., 'return CALLN (Fformat, fmt, text);' is less error-prone than
   '{ Lisp_Object a[2]; a[0] = fmt; a[1] = text; return Fformat (2, a); }'.
   CALLN requires at least one function argument (as C99 prohibits
   empty initializers), and is overkill for simple usages like
   'Finsert (1, &text);'.  */
#define CALLN(f, ...) CALLMANY (f, ((Lisp_Object []) {__VA_ARGS__}))
#define calln(...) CALLN (Ffuncall, __VA_ARGS__)
/* Compatibility aliases.  */
#define call1 calln
#define call2 calln
#define call3 calln
#define call4 calln
#define call5 calln
#define call6 calln
#define call7 calln
#define call8 calln

/* Define 'call0' as a function rather than a CPP macro because we
   sometimes want to pass it as a first class function.  */
INLINE Lisp_Object
call0 (Lisp_Object fn)
{
  return Ffuncall (1, &fn);
}

extern void defvar_lisp (struct Lisp_Fwd const *, char const *);
extern void defvar_lisp_nopro (struct Lisp_Fwd const *, char const *);
extern void defvar_bool (struct Lisp_Fwd const *, char const *);
extern void defvar_int (struct Lisp_Fwd const *, char const *);
extern void defvar_kboard (struct Lisp_Fwd const *, char const *);

/* 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_Fwd const o_fwd			\
      = {Lisp_Fwd_Obj, .u.objvar = &globals.f_##vname};	\
    defvar_lisp (&o_fwd, lname);			\
  } while (false)
#ifdef HAVE_MPS
#define DEFVAR_LISP_NOPRO(lname, vname, doc)		\
  do {							\
    static struct Lisp_Fwd const o_fwd			\
      = {Lisp_Fwd_Obj, .u.objvar = &globals.f_##vname};	\
    defvar_lisp (&o_fwd, lname);			\
  } while (false)
#define DEFVAR_LISP_NOPROX(lname, vname, doc)		\
  do {							\
  static struct Lisp_Fwd const o_fwd			\
    = {Lisp_Fwd_Obj, .u.objvar = &globals.f_##vname};	\
    defvar_lisp_nopro (&o_fwd, lname);			\
  } while (false)
#else
#define DEFVAR_LISP_NOPRO(lname, vname, doc)		\
  do {							\
  static struct Lisp_Fwd const o_fwd			\
    = {Lisp_Fwd_Obj, .u.objvar = &globals.f_##vname};	\
    defvar_lisp_nopro (&o_fwd, lname);			\
  } while (false)
#define DEFVAR_LISP_NOPROX(lname, vname, doc)		\
  do {							\
  static struct Lisp_Fwd const o_fwd			\
    = {Lisp_Fwd_Obj, .u.objvar = &globals.f_##vname};	\
    defvar_lisp_nopro (&o_fwd, lname);			\
  } while (false)
#endif
#define DEFVAR_BOOL(lname, vname, doc)				\
  do {								\
    static struct Lisp_Fwd const b_fwd				\
      = {Lisp_Fwd_Bool, .u.boolvar = &globals.f_##vname};	\
    defvar_bool (&b_fwd, lname);				\
  } while (false)
#define DEFVAR_INT(lname, vname, doc)			\
  do {							\
    static struct Lisp_Fwd const i_fwd			\
      = {Lisp_Fwd_Int, .u.intvar = &globals.f_##vname};	\
    defvar_int (&i_fwd, lname);				\
  } while (false)
#define DEFVAR_KBOARD(lname, vname, doc)			\
  do {								\
    static struct Lisp_Fwd const ko_fwd				\
	= { Lisp_Fwd_Kboard_Obj,				\
	    .u.kbdoffset = offsetof (KBOARD, vname##_)};	\
    defvar_kboard (&ko_fwd, lname);				\
  } while (false)

\f
/* Elisp uses multiple stacks:
   - The C stack.
   - The specpdl stack keeps track of backtraces, unwind-protects and
     dynamic let-bindings.  It is allocated from the 'specpdl' array,
     a manually managed stack.
   - The handler stack keeps track of active catch tags and condition-case
     handlers.  It is allocated in a manually managed stack implemented by a
     doubly-linked list allocated via xmalloc and never freed.  */

/* 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 unwind-protect forms.

   NOTE: The specbinding union is defined here, because SPECPDL_INDEX is
   used all over the place, needs to be fast, and needs to know the size of
   union specbinding.  But only eval.c should access it.  */

enum specbind_tag
{
# ifdef HAVE_MPS
  SPECPDL_FREE,
# endif
  SPECPDL_UNWIND,		/* An unwind_protect function on Lisp_Object.  */
  SPECPDL_UNWIND_ARRAY,		/* Likewise, on an array that needs freeing.
				   Its elements are potential Lisp_Objects.  */
  SPECPDL_UNWIND_PTR,		/* Likewise, on void *.  */
  SPECPDL_UNWIND_INT,		/* Likewise, on int.  */
  SPECPDL_UNWIND_INTMAX,	/* Likewise, on intmax_t.  */
  SPECPDL_UNWIND_EXCURSION,	/* Likewise, on an excursion.  */
  SPECPDL_UNWIND_VOID,		/* Likewise, with no arg.  */
  SPECPDL_BACKTRACE,		/* An element of the backtrace.  */
  SPECPDL_NOP,			/* A filler.  */
#ifdef HAVE_MODULES
  SPECPDL_MODULE_RUNTIME,       /* A live module runtime.  */
  SPECPDL_MODULE_ENVIRONMENT,   /* A live module environment.  */
#endif /* !HAVE_MODULES */
  SPECPDL_LET,			/* A plain and simple dynamic let-binding.  */
  /* Tags greater than SPECPDL_LET must be "subkinds" of LET.  */
  SPECPDL_LET_LOCAL,		/* A buffer-local let-binding.  */
  SPECPDL_LET_DEFAULT		/* A global binding for a localized var.  */
};

/* struct kboard is defined in keyboard.h.  */
typedef struct kboard KBOARD;

union specbinding
  {
    /* Aligning similar members consistently might help efficiency slightly
       (Bug#31996#25).  */
    ENUM_BF (specbind_tag) kind : CHAR_BIT;
    struct {
      ENUM_BF (specbind_tag) kind : CHAR_BIT;
      void (*func) (Lisp_Object);
      Lisp_Object arg;
      EMACS_INT eval_depth;
    } unwind;
    struct {
      ENUM_BF (specbind_tag) kind : CHAR_BIT;
      ptrdiff_t nelts;
      Lisp_Object *array;
    } unwind_array;
    struct {
      ENUM_BF (specbind_tag) kind : CHAR_BIT;
      void (*func) (void *);	/* Unwind function.  */
      void *arg;
      void (*mark) (void *);	/* GC mark function (if non-null).  */
    } unwind_ptr;
    struct {
      ENUM_BF (specbind_tag) kind : CHAR_BIT;
      void (*func) (int);
      int arg;
    } unwind_int;
    struct {
      ENUM_BF (specbind_tag) kind : CHAR_BIT;
      void (*func) (intmax_t);
      intmax_t arg;
    } unwind_intmax;
    struct {
      ENUM_BF (specbind_tag) kind : CHAR_BIT;
      Lisp_Object marker, window;
    } unwind_excursion;
    struct {
      ENUM_BF (specbind_tag) kind : CHAR_BIT;
      void (*func) (void);
    } unwind_void;
    struct {
      ENUM_BF (specbind_tag) kind : CHAR_BIT;
      /* `where' is not used in the case of SPECPDL_LET,
	 unless the symbol is forwarded to a KBOARD.  */
      Lisp_Object symbol, old_value;
      union {
	/* KBOARD object to which SYMBOL forwards, in the case of
	   SPECPDL_LET.  */
	KBOARD *kbd;

	/* Buffer otherwise.  */
	Lisp_Object buf;
      } where;
    } let;
    struct {
      ENUM_BF (specbind_tag) kind : CHAR_BIT;
      bool_bf debug_on_exit : 1;
      Lisp_Object function;
      Lisp_Object *args;
      ptrdiff_t nargs;
    } bt;
  };

/* We use 64-bit platforms as a proxy for ones with ABIs that treat
   small structs efficiently.  */
#if SIZE_MAX > 0xffffffff
#define WRAP_SPECPDL_REF 1
#endif

/* Abstract reference to a specpdl entry.
   The number is always a multiple of sizeof (union specbinding).  */
#ifdef WRAP_SPECPDL_REF
/* Use a proper type for specpdl_ref if it does not make the code slower,
   since the type checking is quite useful.  */
typedef struct { ptrdiff_t bytes; } specpdl_ref;
#else
typedef ptrdiff_t specpdl_ref;
#endif

/* Internal use only.  */
INLINE specpdl_ref
wrap_specpdl_ref (ptrdiff_t bytes)
{
#ifdef WRAP_SPECPDL_REF
  return (specpdl_ref){.bytes = bytes};
#else
  return bytes;
#endif
}

/* Internal use only.  */
INLINE ptrdiff_t
unwrap_specpdl_ref (specpdl_ref ref)
{
#ifdef WRAP_SPECPDL_REF
  return ref.bytes;
#else
  return ref;
#endif
}

INLINE specpdl_ref
specpdl_count_to_ref (ptrdiff_t count)
{
  return wrap_specpdl_ref (count * sizeof (union specbinding));
}

INLINE ptrdiff_t
specpdl_ref_to_count (specpdl_ref ref)
{
  return unwrap_specpdl_ref (ref) / sizeof (union specbinding);
}

/* Whether two `specpdl_ref' refer to the same entry.  */
INLINE bool
specpdl_ref_eq (specpdl_ref a, specpdl_ref b)
{
  return unwrap_specpdl_ref (a) == unwrap_specpdl_ref (b);
}

/* Whether `a' refers to an earlier entry than `b'.  */
INLINE bool
specpdl_ref_lt (specpdl_ref a, specpdl_ref b)
{
  return unwrap_specpdl_ref (a) < unwrap_specpdl_ref (b);
}

INLINE bool
specpdl_ref_valid_p (specpdl_ref ref)
{
  return unwrap_specpdl_ref (ref) >= 0;
}

INLINE specpdl_ref
make_invalid_specpdl_ref (void)
{
  return wrap_specpdl_ref (-1);
}

/* Return a reference that is `delta' steps more recent than `ref'.
   `delta' may be negative or zero.  */
INLINE specpdl_ref
specpdl_ref_add (specpdl_ref ref, ptrdiff_t delta)
{
  return wrap_specpdl_ref (unwrap_specpdl_ref (ref)
			   + delta * sizeof (union specbinding));
}

INLINE union specbinding *
specpdl_ref_to_ptr (specpdl_ref ref)
{
  return (union specbinding *)((char *)specpdl + unwrap_specpdl_ref (ref));
}

/* Return a reference to the most recent specpdl entry.  */
INLINE specpdl_ref
SPECPDL_INDEX (void)
{
  return wrap_specpdl_ref ((char *)specpdl_ptr - (char *)specpdl);
}

INLINE bool
backtrace_debug_on_exit (union specbinding *pdl)
{
  eassert (pdl->kind == SPECPDL_BACKTRACE);
  return pdl->bt.debug_on_exit;
}

void grow_specpdl_allocation (void);

/* Grow the specpdl stack by one entry.
   The caller should have already initialized the entry.
   Signal an error on stack overflow.

   Make sure that there is always one unused entry past the top of the
   stack, so that the just-initialized entry is safely unwound if
   memory exhausted and an error is signaled here.  Also, allocate a
   never-used entry just before the bottom of the stack; sometimes its
   address is taken.  */
INLINE void
grow_specpdl (void)
{
  specpdl_ptr++;
  if (specpdl_ptr == specpdl_end)
    grow_specpdl_allocation ();
}

INLINE specpdl_ref
record_in_backtrace (Lisp_Object function, Lisp_Object *args, ptrdiff_t nargs)
{
  specpdl_ref count = SPECPDL_INDEX ();

  eassert (nargs >= UNEVALLED);
  specpdl_ptr->bt.kind = SPECPDL_BACKTRACE;
  specpdl_ptr->bt.debug_on_exit = false;
  specpdl_ptr->bt.function = function;
  current_thread->stack_top = specpdl_ptr->bt.args = args;
  specpdl_ptr->bt.nargs = nargs;
  grow_specpdl ();

  return count;
}

/* This structure helps implement the `catch/throw' and `condition-case/signal'
   control structures as well as 'handler-bind'.
   A struct handler contains all the information needed to
   restore the state of the interpreter after a non-local jump.

   Handler structures are chained together in a doubly linked list; the `next'
   member points to the next outer catchtag and the `nextfree' member points in
   the other direction to the next inner element (which is typically the next
   free element since we mostly use it on the deepest handler).

   A call like (throw TAG VAL) searches for a catchtag whose `tag_or_ch'
   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.  If there is a handler of type CATCHER_ALL, it will
   be treated as a handler for all invocations of `signal' and `throw';
   in this case `val' will be set to (ERROR-SYMBOL . DATA) or (TAG . VAL),
   respectively.  During stack unwinding, `nonlocal_exit' is set to
   specify the type of nonlocal exit that caused the stack unwinding.

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

   When running the HANDLER of a 'handler-bind', we need to
   temporarily "mute" the CONDITION_CASEs and HANDLERs that are "below"
   the current handler, but without hiding any CATCHERs.  We do that by
   installing a SKIP_CONDITIONS which tells the search to skip the
   N next conditions.  */

enum handlertype {
  CATCHER,                      /* Entry for 'catch'.
                                   'tag_or_ch' holds the catch's tag.
                                   'val' holds the retval during longjmp.  */
  CONDITION_CASE,               /* Entry for 'condition-case'.
                                   'tag_or_ch' holds the list of conditions.
                                   'val' holds the retval during longjmp.  */
  CATCHER_ALL,                  /* Wildcard which catches all 'throw's.
                                   'tag_or_ch' is unused.
                                   'val' holds the retval during longjmp.  */
  HANDLER_BIND,                 /* Entry for 'handler-bind'.
                                   'tag_or_ch' holds the list of conditions.
                                   'val' holds the handler function.
                                   The rest of the handler is unused,
                                   except for 'bytecode_dest' that holds
                                   the number of preceding HANDLER_BIND
                                   entries which belong to the same
                                   'handler-bind' (and hence need to
                                   be muted together).  */
  SKIP_CONDITIONS               /* Mask out the N preceding entries.
                                   Used while running the handler of
                                   a HANDLER_BIND to hides the condition
                                   handlers underneath (and including)
                                   the 'handler-bind'.
                                   'tag_or_ch' holds that number, the rest
                                   is unused.  */
};

enum nonlocal_exit
{
  NONLOCAL_EXIT_SIGNAL,
  NONLOCAL_EXIT_THROW,
};

struct handler
{
  GC_HEADER
  enum handlertype type;
  Lisp_Object tag_or_ch;

  /* The next two are set by unwind_to_catch.  */
  enum nonlocal_exit nonlocal_exit;
  Lisp_Object val;

  struct handler *next;
  struct handler *nextfree;

  /* The bytecode interpreter can have several handlers active at the same
     time, so when we longjmp to one of them, it needs to know which handler
     this was and what was the corresponding internal state.  This is stored
     here, and when we longjmp we make sure that handlerlist points to the
     proper handler.  */
  Lisp_Object *bytecode_top;
  int bytecode_dest;

  /* Most global vars are reset to their value via the specpdl mechanism,
     but a few others are handled by storing their value here.  */
  sys_jmp_buf jmp;
  EMACS_INT f_lisp_eval_depth;
  specpdl_ref pdlcount;
  struct bc_frame *act_rec;
  int poll_suppress_count;
  int interrupt_input_blocked;

#ifdef HAVE_X_WINDOWS
  int x_error_handler_depth;
#endif
};

extern Lisp_Object memory_signal_data;

/* True if ought to quit now.  */

#define QUITP (!NILP (Vquit_flag) && NILP (Vinhibit_quit))

extern bool volatile pending_signals;
extern void process_pending_signals (void);
extern void probably_quit (void);

/* 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 call maybe_quit at times when it is safe to quit.  Every
   loop that might run for a long time or might not exit ought to call
   maybe_quit at least once, at a safe place.  Unless that is
   impossible, of course.  But it is very desirable to avoid creating
   loops where maybe_quit is impossible.

   If quit-flag is set to `kill-emacs' the SIGINT handler has received
   a request to exit Emacs when it is safe to do.

   When not quitting, process any pending signals.  */

INLINE void
maybe_quit (void)
{
  if (!NILP (Vquit_flag) || pending_signals)
    probably_quit ();

  gc_maybe_quit ();
}

/* Process a quit rarely, based on a counter COUNT, for efficiency.
   "Rarely" means once per USHRT_MAX + 1 times; this is somewhat
   arbitrary, but efficient.  */

INLINE void
rarely_quit (unsigned short int count)
{
  if (! count)
    maybe_quit ();
}
\f
extern Lisp_Object Vascii_downcase_table;
extern Lisp_Object Vascii_canon_table;
\f
/* Call staticpro (&var) to protect static variable `var'.  */

void staticpro (Lisp_Object const *);

enum { NSTATICS = 2048 };
extern Lisp_Object const *staticvec[NSTATICS];
extern int staticidx;

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

/* Define if the windowing system provides a menu bar.  */
#if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI) \
  || defined (HAVE_NS) || defined (USE_GTK) || defined (HAVE_HAIKU)
#define HAVE_EXT_MENU_BAR true
#endif

/* Define if the windowing system provides a tool-bar.  */
#if defined (USE_GTK) || defined (HAVE_NS)
#define HAVE_EXT_TOOL_BAR true
#endif

/* Return the address of vector A's element at index I.  */

INLINE Lisp_Object *
xvector_contents_addr (Lisp_Object a, ptrdiff_t i)
{
  /* This should return &XVECTOR (a)->contents[i], but that would run
     afoul of GCC bug 95072.  */
  void *v = XVECTOR (a);
  char *p = v;
  void *w = p + header_size + i * word_size;
  return w;
}

/* Return the address of vector A's elements.  */

INLINE Lisp_Object *
xvector_contents (Lisp_Object a)
{
  return xvector_contents_addr (a, 0);
}

/* Copy COUNT Lisp_Objects from ARGS to contents of V starting from OFFSET.  */

INLINE void
vcopy (Lisp_Object v, ptrdiff_t offset, Lisp_Object const *args,
       ptrdiff_t count)
{
  eassert (0 <= offset && 0 <= count && offset + count <= ASIZE (v));
  memcpy (xvector_contents_addr (v, offset), args, count * sizeof *args);
}

/* Functions to modify hash tables.  */

INLINE void
set_hash_key_slot (struct Lisp_Hash_Table *h, ptrdiff_t idx, Lisp_Object val)
{
  eassert (idx >= 0 && idx < h->table_size);
  h->key[idx] = val;
}

INLINE void
set_hash_value_slot (struct Lisp_Hash_Table *h, ptrdiff_t idx, Lisp_Object val)
{
  eassert (idx >= 0 && idx < h->table_size);
  h->value[idx] = val;;
}

#ifdef HAVE_MPS
void weak_hash_table_thaw (Lisp_Object hash_table);

INLINE void
set_weak_hash_key_slot (struct Lisp_Weak_Hash_Table *h, ptrdiff_t idx, Lisp_Object val)
{
  eassert (idx >= 0 && idx < XFIXNUM (h->strong->table_size));
  h->strong->key[idx] = make_weak_hash_table_entry (val);
}

INLINE void
set_weak_hash_value_slot (struct Lisp_Weak_Hash_Table *h, ptrdiff_t idx, Lisp_Object val)
{
  eassert (idx >= 0 && idx < XFIXNUM (h->strong->table_size) );
  h->strong->value[idx] = make_weak_hash_table_entry (val);
}
#endif

/* Use these functions to set Lisp_Object
   or pointer slots of struct Lisp_Symbol.  */

INLINE void
set_symbol_function (Lisp_Object sym, Lisp_Object function)
{
  XSYMBOL (sym)->u.s.function = function;
}

INLINE void
set_symbol_plist (Lisp_Object sym, Lisp_Object plist)
{
  XSYMBOL (sym)->u.s.plist = plist;
}

INLINE void
set_symbol_next (Lisp_Object sym, struct Lisp_Symbol *next)
{
  XSYMBOL (sym)->u.s.next = next;
}

INLINE void
make_symbol_constant (Lisp_Object sym)
{
  XSYMBOL (sym)->u.s.trapped_write = SYMBOL_NOWRITE;
}

/* Buffer-local variable access functions.  */

INLINE bool
blv_found (struct Lisp_Buffer_Local_Value *blv)
{
  eassert (blv->found == !BASE_EQ (blv->defcell, blv->valcell));
  return blv->found;
}

/* Set overlay's property list.  */

INLINE void
set_overlay_plist (Lisp_Object overlay, Lisp_Object plist)
{
  XOVERLAY (overlay)->plist = plist;
}

/* Get text properties of S.  */

INLINE INTERVAL
string_intervals (Lisp_Object s)
{
  return XSTRING (s)->u.s.intervals;
}

/* Set text properties of S to I.  */

INLINE void
set_string_intervals (Lisp_Object s, INTERVAL i)
{
  XSTRING (s)->u.s.intervals = i;
}

/* Set a Lisp slot in TABLE to VAL.  Most code should use this instead
   of setting slots directly.  */

INLINE void
set_char_table_defalt (Lisp_Object table, Lisp_Object val)
{
  XCHAR_TABLE (table)->defalt = val;
}
INLINE void
set_char_table_purpose (Lisp_Object table, Lisp_Object val)
{
  XCHAR_TABLE (table)->purpose = val;
}

/* Set different slots in (sub)character tables.  */

INLINE void
set_char_table_extras (Lisp_Object table, ptrdiff_t idx, Lisp_Object val)
{
  eassert (0 <= idx && idx < CHAR_TABLE_EXTRA_SLOTS (XCHAR_TABLE (table)));
  XCHAR_TABLE (table)->extras[idx] = val;
}

INLINE void
set_char_table_contents (Lisp_Object table, ptrdiff_t idx, Lisp_Object val)
{
  eassert (0 <= idx && idx < (1 << CHARTAB_SIZE_BITS_0));
  XCHAR_TABLE (table)->contents[idx] = val;
}

INLINE void
set_sub_char_table_contents (Lisp_Object table, ptrdiff_t idx, Lisp_Object val)
{
  XSUB_CHAR_TABLE (table)->contents[idx] = val;
}

/* Defined in bignum.c.  This part of bignum.c's API does not require
   the caller to access bignum internals; see bignum.h for that.  */
extern intmax_t bignum_to_intmax (Lisp_Object) ATTRIBUTE_CONST;
extern uintmax_t bignum_to_uintmax (Lisp_Object) ATTRIBUTE_CONST;
extern ptrdiff_t bignum_bufsize (Lisp_Object, int) ATTRIBUTE_CONST;
extern ptrdiff_t bignum_to_c_string (char *, ptrdiff_t, Lisp_Object, int);
extern Lisp_Object bignum_to_string (Lisp_Object, int);
extern Lisp_Object make_bignum_str (char const *, int);
extern Lisp_Object make_neg_biguint (uintmax_t);
extern Lisp_Object double_to_integer (double);

/* Convert the integer NUM to *N.  Return true if successful, false
   (possibly setting *N) otherwise.  */
INLINE bool
integer_to_intmax (Lisp_Object num, intmax_t *n)
{
  if (FIXNUMP (num))
    {
      *n = XFIXNUM (num);
      return true;
    }
  else
    {
      intmax_t i = bignum_to_intmax (num);
      *n = i;
      return i != 0;
    }
}
INLINE bool
integer_to_uintmax (Lisp_Object num, uintmax_t *n)
{
  if (FIXNUMP (num))
    {
      *n = XFIXNUM (num);
      return 0 <= XFIXNUM (num);
    }
  else
    {
      uintmax_t i = bignum_to_uintmax (num);
      *n = i;
      return i != 0;
    }
}

/* Return floor (log2 (N)) as an int.  If N is zero, return -1.  */
INLINE int
elogb (unsigned long long int n)
{
  int width = stdc_bit_width (n);
  return width - 1;
}

/* A modification count.  These are wide enough, and incremented
   rarely enough, so that they should never overflow a 60-bit counter
   in practice, and the code below assumes this so a compiler can
   generate better code if EMACS_INT is 64 bits.  */
typedef intmax_t modiff_count;

INLINE modiff_count
modiff_incr (modiff_count *a, ptrdiff_t len)
{
  modiff_count a0 = *a;
  /* Increase the counter more for a large modification and less for a
     small modification.  Increase it logarithmically to avoid
     increasing it too much.  */
  static_assert (PTRDIFF_MAX <= ULLONG_MAX);
  int incr = len == 0 ? 1 : elogb (len) + 1;
  bool modiff_overflow = ckd_add (a, a0, incr);
  eassert (!modiff_overflow && *a >> 30 >> 30 == 0);
  return a0;
}

INLINE Lisp_Object
modiff_to_integer (modiff_count a)
{
  eassume (0 <= a && a >> 30 >> 30 == 0);
  return make_int (a);
}

/* Defined in data.c.  */
extern AVOID wrong_choice (Lisp_Object, Lisp_Object);
extern void notify_variable_watchers (Lisp_Object, Lisp_Object,
				      Lisp_Object, Lisp_Object);
extern Lisp_Object indirect_function (Lisp_Object);
extern Lisp_Object find_symbol_value (Lisp_Object);

enum {
  Cmp_Bit_EQ,
  Cmp_Bit_LT,
  Cmp_Bit_GT
};

/* code indicating a comparison outcome */
typedef enum {
  Cmp_EQ = 1 << Cmp_Bit_EQ,	/* = */
  Cmp_LT = 1 << Cmp_Bit_LT,	/* < */
  Cmp_GT = 1 << Cmp_Bit_GT	/* > */
} cmp_bits_t;

extern cmp_bits_t arithcompare (Lisp_Object num1, Lisp_Object num2);

/* Convert the Emacs representation CONS back to an integer of type
   TYPE, storing the result the variable VAR.  Signal an error if CONS
   is not a valid representation or is out of range for TYPE.  */
#define CONS_TO_INTEGER(cons, type, var)				\
 (TYPE_SIGNED (type)							\
  ? ((var) = cons_to_signed (cons, TYPE_MINIMUM (type), TYPE_MAXIMUM (type))) \
  : ((var) = cons_to_unsigned (cons, TYPE_MAXIMUM (type))))
extern intmax_t cons_to_signed (Lisp_Object, intmax_t, intmax_t);
extern uintmax_t cons_to_unsigned (Lisp_Object, uintmax_t);

extern AVOID args_out_of_range (Lisp_Object, Lisp_Object);
extern AVOID circular_list (Lisp_Object);
extern KBOARD *kboard_for_bindings (void);
extern Lisp_Object do_symval_forwarding (lispfwd);
enum Set_Internal_Bind
  {
    SET_INTERNAL_SET,
    SET_INTERNAL_BIND,
    SET_INTERNAL_UNBIND,
    SET_INTERNAL_THREAD_SWITCH,
  };
extern void set_internal (Lisp_Object, Lisp_Object, Lisp_Object,
                          enum Set_Internal_Bind);
extern void set_default_internal (Lisp_Object, Lisp_Object,
                                  enum Set_Internal_Bind, KBOARD *);
extern Lisp_Object expt_integer (Lisp_Object, Lisp_Object);
extern void syms_of_data (void);
extern void swap_in_global_binding (struct Lisp_Symbol *);

/* Defined in cmds.c */
extern void syms_of_cmds (void);

/* Defined in coding.c.  */
extern Lisp_Object detect_coding_system (const unsigned char *, ptrdiff_t,
                                         ptrdiff_t, bool, bool, Lisp_Object);
extern void init_coding (void);
extern void init_coding_once (void);
extern void syms_of_coding (void);
extern bool string_ascii_p (Lisp_Object);

/* Defined in character.c.  */
extern ptrdiff_t chars_in_text (const unsigned char *, ptrdiff_t);
extern ptrdiff_t multibyte_chars_in_text (const unsigned char *, ptrdiff_t);
extern void syms_of_character (void);

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

/* Defined in syntax.c.  */
extern void init_syntax_once (void);
extern void syms_of_syntax (void);

/* Defined in fns.c.  */
enum { NEXT_ALMOST_PRIME_LIMIT = 11 };
extern ptrdiff_t list_length (Lisp_Object);
extern EMACS_INT next_almost_prime (EMACS_INT) ATTRIBUTE_CONST;
extern Lisp_Object larger_vector (Lisp_Object, ptrdiff_t, ptrdiff_t);
extern bool sweep_weak_table (struct Lisp_Hash_Table *, bool);
extern void hexbuf_digest (char *, void const *, int);
extern char *extract_data_from_object (Lisp_Object, ptrdiff_t *, ptrdiff_t *);
EMACS_UINT hash_string (char const *, ptrdiff_t);
EMACS_UINT sxhash (Lisp_Object);
Lisp_Object make_hash_table (const struct hash_table_test *, EMACS_INT,
                             hash_table_weakness_t, bool);
Lisp_Object hash_table_weakness_symbol (hash_table_weakness_t weak);
ptrdiff_t hash_lookup (struct Lisp_Hash_Table *, Lisp_Object);
ptrdiff_t hash_lookup_get_hash (struct Lisp_Hash_Table *h, Lisp_Object key,
				hash_hash_t *phash);
ptrdiff_t hash_put (struct Lisp_Hash_Table *, Lisp_Object, Lisp_Object,
		    hash_hash_t);
void hash_remove_from_table (struct Lisp_Hash_Table *, Lisp_Object);

#ifdef HAVE_MPS
Lisp_Object strengthen_hash_table (Lisp_Object weak);
Lisp_Object strengthen_hash_table_for_dump (struct Lisp_Weak_Hash_Table *);
ptrdiff_t weak_hash_lookup (struct Lisp_Weak_Hash_Table *, Lisp_Object);
ptrdiff_t weak_hash_put (struct Lisp_Weak_Hash_Table *, Lisp_Object, Lisp_Object,
			 Lisp_Object);
void weak_hash_remove_from_table (struct Lisp_Weak_Hash_Table *, Lisp_Object);
void weak_hash_splat_from_table (struct Lisp_Weak_Hash_Table *h, ptrdiff_t i0);
#endif

extern struct hash_table_test const hashtest_eq, hashtest_eql, hashtest_equal;
extern void validate_subarray (Lisp_Object, Lisp_Object, Lisp_Object,
			       ptrdiff_t, ptrdiff_t *, ptrdiff_t *);
extern Lisp_Object substring_both (Lisp_Object, ptrdiff_t, ptrdiff_t,
				   ptrdiff_t, ptrdiff_t);
extern Lisp_Object merge (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object merge_c (Lisp_Object, Lisp_Object, bool (*) (Lisp_Object, Lisp_Object));
extern Lisp_Object do_yes_or_no_p (Lisp_Object);
extern Lisp_Object concat2 (Lisp_Object, Lisp_Object);
extern Lisp_Object concat3 (Lisp_Object, Lisp_Object, Lisp_Object);
extern bool equal_no_quit (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 assq_no_signal (Lisp_Object, Lisp_Object);
extern Lisp_Object assoc_no_quit (Lisp_Object, Lisp_Object);
extern void clear_string_char_byte_cache (void);
extern ptrdiff_t string_char_to_byte (Lisp_Object, ptrdiff_t);
extern ptrdiff_t string_byte_to_char (Lisp_Object, ptrdiff_t);
extern Lisp_Object string_to_multibyte (Lisp_Object);
extern Lisp_Object string_make_unibyte (Lisp_Object);
extern Lisp_Object plist_get (Lisp_Object plist, Lisp_Object prop);
extern Lisp_Object plist_put (Lisp_Object plist, Lisp_Object prop,
			      Lisp_Object val);
extern Lisp_Object plist_member (Lisp_Object plist, Lisp_Object prop);
extern void syms_of_fns (void);
extern void mark_fns (void);

/* Defined in sort.c  */
extern void tim_sort (Lisp_Object, Lisp_Object, Lisp_Object *, const ptrdiff_t,
		      bool)
  ARG_NONNULL ((3));

/* Defined in floatfns.c.  */
static_assert (FLT_RADIX == 2 || FLT_RADIX == 16);
enum { LOG2_FLT_RADIX = FLT_RADIX == 2 ? 1 : 4 };
int double_integer_scale (double);
#ifndef HAVE_TRUNC
extern double trunc (double);
#endif
extern Lisp_Object fmod_float (Lisp_Object x, Lisp_Object y);
extern void syms_of_floatfns (void);

/* 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 int x_bitmap_mask (struct frame *, ptrdiff_t);
extern void syms_of_image (void);

/* Defined in json.c.  */
extern void syms_of_json (void);

/* Defined in insdel.c.  */
extern void move_gap_both (ptrdiff_t, ptrdiff_t);
extern AVOID buffer_overflow (void);
extern void make_gap (ptrdiff_t);
extern void make_gap_1 (struct buffer *, ptrdiff_t);
extern ptrdiff_t copy_text (const unsigned char *, unsigned char *,
			    ptrdiff_t, bool, bool);
extern int count_combining_before (const unsigned char *,
				   ptrdiff_t, ptrdiff_t, ptrdiff_t);
extern int count_combining_after (const unsigned char *,
				  ptrdiff_t, ptrdiff_t, ptrdiff_t);
extern void insert (const char *, ptrdiff_t);
extern void insert_and_inherit (const char *, ptrdiff_t);
extern void insert_1_both (const char *, ptrdiff_t, ptrdiff_t,
			   bool, bool, bool);
extern void insert_from_gap_1 (ptrdiff_t, ptrdiff_t, bool);
extern void insert_from_gap (ptrdiff_t, ptrdiff_t, bool, bool);
extern void insert_from_string (Lisp_Object, ptrdiff_t, ptrdiff_t,
				ptrdiff_t, ptrdiff_t, bool);
extern void insert_from_buffer (struct buffer *, ptrdiff_t, ptrdiff_t, bool);
extern void insert_char (int);
extern void insert_string (const char *);
extern void insert_before_markers (const char *, ptrdiff_t);
extern void insert_before_markers_and_inherit (const char *, ptrdiff_t);
extern void insert_from_string_before_markers (Lisp_Object, ptrdiff_t,
					       ptrdiff_t, ptrdiff_t,
					       ptrdiff_t, bool);
extern void del_range (ptrdiff_t, ptrdiff_t);
extern Lisp_Object del_range_1 (ptrdiff_t, ptrdiff_t, bool, bool);
extern void del_range_byte (ptrdiff_t, ptrdiff_t);
extern void del_range_both (ptrdiff_t, ptrdiff_t, ptrdiff_t, ptrdiff_t, bool);
extern Lisp_Object del_range_2 (ptrdiff_t, ptrdiff_t,
				ptrdiff_t, ptrdiff_t, bool);
extern int safe_del_range (ptrdiff_t, ptrdiff_t);
extern void modify_text (ptrdiff_t, ptrdiff_t);
extern void prepare_to_modify_buffer (ptrdiff_t, ptrdiff_t, ptrdiff_t *);
extern void prepare_to_modify_buffer_1 (ptrdiff_t, ptrdiff_t, ptrdiff_t *);
extern void invalidate_buffer_caches (struct buffer *, ptrdiff_t, ptrdiff_t);
extern void signal_after_change (ptrdiff_t, ptrdiff_t, ptrdiff_t);
extern void adjust_after_insert (ptrdiff_t, ptrdiff_t, ptrdiff_t,
				 ptrdiff_t, ptrdiff_t);
extern void adjust_markers_for_delete (ptrdiff_t, ptrdiff_t,
				       ptrdiff_t, ptrdiff_t);
extern void adjust_markers_for_insert (ptrdiff_t, ptrdiff_t,
				       ptrdiff_t, ptrdiff_t, bool);
extern void adjust_markers_bytepos (ptrdiff_t, ptrdiff_t,
				    ptrdiff_t, ptrdiff_t, int);
extern void replace_range (ptrdiff_t, ptrdiff_t, Lisp_Object, bool, bool,
			   bool, bool, bool);
extern void replace_range_2 (ptrdiff_t, ptrdiff_t, ptrdiff_t, ptrdiff_t,
			     const char *, ptrdiff_t, ptrdiff_t, bool);
extern void syms_of_insdel (void);

/* Defined in dispnew.c.  */
#ifdef PROFILING
_Noreturn void __executable_start (void);
#endif
extern Lisp_Object Vwindow_system;
extern Lisp_Object sit_for (Lisp_Object, bool, int);

/* Defined in xdisp.c.  */
extern bool noninteractive_need_newline;
extern Lisp_Object echo_area_buffer[2];
extern void add_to_log (char const *, ...);
extern void vadd_to_log (char const *, va_list);
extern void check_message_stack (void);
extern void clear_message_stack (void);
extern void setup_echo_area_for_printing (bool);
extern bool push_message (void);
extern void pop_message_unwind (void);
extern Lisp_Object restore_message_unwind (Lisp_Object);
extern void restore_message (void);
extern Lisp_Object current_message (void);
extern void clear_message (bool, bool);
extern void message (const char *, ...) ATTRIBUTE_FORMAT_PRINTF (1, 2);
extern void message1 (const char *);
extern void message1_nolog (const char *);
extern void message3 (Lisp_Object);
extern void message3_nolog (Lisp_Object);
extern void message_dolog (const char *, ptrdiff_t, bool, bool);
extern void message_with_string (const char *, Lisp_Object, bool);
extern void message_log_maybe_newline (void);
extern void update_echo_area (void);
extern void truncate_echo_area (ptrdiff_t);
extern void redisplay (void);
extern ptrdiff_t count_lines (ptrdiff_t start_byte, ptrdiff_t end_byte);

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 bool pos_visible_p (struct window *, ptrdiff_t, int *,
			   int *, int *, int *, int *, int *);

/* Defined in sqlite.c.  */
extern void syms_of_sqlite (void);

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

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

/* Defined in character.c.  */
extern void parse_str_as_multibyte (const unsigned char *, ptrdiff_t,
				    ptrdiff_t *, ptrdiff_t *);

/* Defined in alloc.c.  */
extern ptrdiff_t pure_bytes_used_lisp;
struct Lisp_Vector *allocate_vectorlike (ptrdiff_t len, bool clearit);
extern void run_finalizer_function (Lisp_Object function);
extern intptr_t garbage_collection_inhibited;
extern void *my_heap_start (void);
extern void check_pure_size (void);
unsigned char *resize_string_data (Lisp_Object, ptrdiff_t, int, int);
extern void malloc_warning (const char *);
extern AVOID memory_full (size_t);
extern AVOID buffer_memory_full (ptrdiff_t);
extern bool survives_gc_p (Lisp_Object);
extern void mark_object (Lisp_Object);
extern void mark_objects (Lisp_Object *, ptrdiff_t);
#if defined REL_ALLOC && !defined SYSTEM_MALLOC && !defined HYBRID_MALLOC
extern void refill_memory_reserve (void);
#endif
extern void alloc_unexec_pre (void);
extern void alloc_unexec_post (void);
extern void mark_c_stack (char const *, char const *);
extern void flush_stack_call_func1 (void (*func) (void *arg), void *arg);
extern void mark_memory (void const *start, void const *end);

/* Force callee-saved registers and register windows onto the stack,
   so that conservative garbage collection can see their values.  */
#ifndef HAVE___BUILTIN_UNWIND_INIT
# ifdef __sparc__
   /* This trick flushes the register windows so that all the state of
      the process is contained in the stack.
      FreeBSD does not have a ta 3 handler, so handle it specially.
      FIXME: Code in the Boehm GC suggests flushing (with 'flushrs') is
      needed on ia64 too.  See mach_dep.c, where it also says inline
      assembler doesn't work with relevant proprietary compilers.  */
#  if defined __sparc64__ && defined __FreeBSD__
#   define __builtin_unwind_init() asm ("flushw")
#  else
#   define __builtin_unwind_init() asm ("ta 3")
#  endif
# else
#  define __builtin_unwind_init() ((void) 0)
# endif
#endif
INLINE void
flush_stack_call_func (void (*func) (void *arg), void *arg)
{
  __builtin_unwind_init ();
  flush_stack_call_func1 (func, arg);
  /* Work around GCC sibling call optimization making
     '__builtin_unwind_init' ineffective (bug#65727).
     See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115132>.  */
#if defined __GNUC__ && !defined __clang__ && !defined __OBJC__
  asm ("");
#endif
}

extern void garbage_collect (void);
extern void maybe_garbage_collect (void);
extern bool maybe_garbage_collect_eagerly (EMACS_INT factor);
extern const char *pending_malloc_warning;
extern Lisp_Object zero_vector;
extern EMACS_INT consing_until_gc;
#ifdef HAVE_PDUMPER
extern int number_finalizers_run;
#endif
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);
extern Lisp_Object listn (ptrdiff_t, Lisp_Object, ...);
extern Lisp_Object pure_listn (ptrdiff_t, Lisp_Object, ...);
#define list(...) \
  listn (ARRAYELTS (((Lisp_Object []) {__VA_ARGS__})), __VA_ARGS__)
#define pure_list(...) \
  pure_listn (ARRAYELTS (((Lisp_Object []) {__VA_ARGS__})), __VA_ARGS__)

enum gc_root_type
{
  GC_ROOT_STATICPRO,
  GC_ROOT_BUFFER_LOCAL_DEFAULT,
  GC_ROOT_BUFFER_LOCAL_NAME,
  GC_ROOT_C_SYMBOL
};

struct gc_root_visitor
{
  void (*visit) (Lisp_Object const *, enum gc_root_type, void *);
  void *data;
};
extern void visit_static_gc_roots (struct gc_root_visitor visitor);

/* Build a frequently used 1/2/3/4-integer lists.  */

INLINE Lisp_Object
list1i (intmax_t a)
{
  return list1 (make_int (a));
}

INLINE Lisp_Object
list2i (intmax_t a, intmax_t b)
{
  return list2 (make_int (a), make_int (b));
}

INLINE Lisp_Object
list3i (intmax_t a, intmax_t b, intmax_t c)
{
  return list3 (make_int (a), make_int (b), make_int (c));
}

INLINE Lisp_Object
list4i (intmax_t a, intmax_t b, intmax_t c, intmax_t d)
{
  return list4 (make_int (a), make_int (b), make_int (c), make_int (d));
}

extern Lisp_Object make_clear_bool_vector (EMACS_INT, bool);
extern Lisp_Object make_uninit_bool_vector (EMACS_INT);
extern Lisp_Object bool_vector_fill (Lisp_Object, Lisp_Object);
extern AVOID string_overflow (void);
extern Lisp_Object make_string (const char *, ptrdiff_t);
extern Lisp_Object make_formatted_string (char *, const char *, ...)
  ATTRIBUTE_FORMAT_PRINTF (2, 3);
extern Lisp_Object make_unibyte_string (const char *, ptrdiff_t);
extern ptrdiff_t vectorlike_nbytes (const struct vectorlike_header *hdr);

INLINE ptrdiff_t
vector_nbytes (const struct Lisp_Vector *v)
{
  return vectorlike_nbytes (&v->header);
}

/* Make unibyte string from C string when the length isn't known.  */

INLINE Lisp_Object
build_unibyte_string (const char *str)
{
  return make_unibyte_string (str, strlen (str));
}

extern Lisp_Object make_multibyte_string (const char *, ptrdiff_t, ptrdiff_t);
extern Lisp_Object make_event_array (ptrdiff_t, 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 *, ptrdiff_t, ptrdiff_t);
extern Lisp_Object make_specified_string (const char *,
					  ptrdiff_t, ptrdiff_t, bool);
extern Lisp_Object make_pure_string (const char *, ptrdiff_t, ptrdiff_t, bool);
extern Lisp_Object make_pure_c_string (const char *, ptrdiff_t);
extern void pin_string (Lisp_Object string);

/* Make a string allocated in pure space, use STR as string data.  */

INLINE Lisp_Object
build_pure_c_string (const char *str)
{
  return make_pure_c_string (str, strlen (str));
}

/* Make a string from the data at STR, treating it as multibyte if the
   data warrants.  */

INLINE Lisp_Object
build_string (const char *str)
{
  return make_string (str, strlen (str));
}

extern Lisp_Object pure_cons (Lisp_Object, Lisp_Object);
extern Lisp_Object make_vector (ptrdiff_t, Lisp_Object);
extern struct Lisp_Vector *allocate_nil_vector (ptrdiff_t)
  ATTRIBUTE_RETURNS_NONNULL;

/* Make an uninitialized vector for SIZE objects.  NOTE: you must
   be sure that GC cannot happen until the vector is completely
   initialized.  E.g. the following code is likely to crash:

   v = make_uninit_vector (3);
   ASET (v, 0, obj0);
   ASET (v, 1, Ffunction_can_gc ());
   ASET (v, 2, obj1);

   allocate_vector has a similar problem.  */

extern struct Lisp_Vector *allocate_vector (ptrdiff_t)
  ATTRIBUTE_RETURNS_NONNULL;

INLINE Lisp_Object
make_uninit_vector (ptrdiff_t size)
{
  return make_lisp_ptr (allocate_vector (size), Lisp_Vectorlike);
}

/* Like above, but special for sub char-tables.  */

INLINE Lisp_Object
make_uninit_sub_char_table (int depth, int min_char)
{
  int slots = SUB_CHAR_TABLE_OFFSET + chartab_size[depth];
  Lisp_Object v = make_uninit_vector (slots);

  XSETPVECTYPE (XVECTOR (v), PVEC_SUB_CHAR_TABLE);
  XSUB_CHAR_TABLE (v)->depth = depth;
  XSUB_CHAR_TABLE (v)->min_char = min_char;
  return v;
}

/* Make a vector of SIZE nils - faster than make_vector (size, Qnil)
   if the OS already cleared the new memory.  */

INLINE Lisp_Object
make_nil_vector (ptrdiff_t size)
{
  return make_lisp_ptr (allocate_nil_vector (size), Lisp_Vectorlike);
}

extern struct Lisp_Vector *allocate_pseudovector (int, int, int,
						  enum pvec_type)
  ATTRIBUTE_RETURNS_NONNULL;

/* Allocate uninitialized pseudovector with no Lisp_Object slots.  */

#define ALLOCATE_PLAIN_PSEUDOVECTOR(type, tag) \
  ((type *) allocate_pseudovector (VECSIZE (type), 0, 0, tag))

/* Allocate partially initialized pseudovector where all Lisp_Object
   slots are set to Qnil but the rest (if any) is left uninitialized.  */

#define ALLOCATE_PSEUDOVECTOR(type, field, tag)			       \
  ((type *) allocate_pseudovector (VECSIZE (type),		       \
				   PSEUDOVECSIZE (type, field),	       \
				   PSEUDOVECSIZE (type, field), tag))

/* Allocate fully initialized pseudovector where all Lisp_Object
   slots are set to Qnil and the rest (if any) is zeroed.  */

#define ALLOCATE_ZEROED_PSEUDOVECTOR(type, field, tag)		       \
  ((type *) allocate_pseudovector (VECSIZE (type),		       \
				   PSEUDOVECSIZE (type, field),	       \
				   VECSIZE (type), tag))

extern bool gc_in_progress;
extern Lisp_Object make_float (double);
extern void display_malloc_warning (void);
extern specpdl_ref inhibit_garbage_collection (void);
extern Lisp_Object build_symbol_with_pos (Lisp_Object, Lisp_Object);
#ifndef HAVE_MPS
extern void free_cons (struct Lisp_Cons *);
#endif
extern void init_alloc_once (void);
extern void init_alloc (void);
extern void syms_of_alloc (void);
extern struct buffer *allocate_buffer (void) ATTRIBUTE_RETURNS_NONNULL;
extern int valid_lisp_object_p (Lisp_Object);

void *hash_table_alloc_bytes (ptrdiff_t nbytes) ATTRIBUTE_MALLOC_SIZE ((1));
void hash_table_free_bytes (void *p, ptrdiff_t nbytes);
Lisp_Object *hash_table_alloc_kv (void *h, ptrdiff_t nobjs);
void hash_table_free_kv (void *h, Lisp_Object *p);

/* Defined in gmalloc.c.  */
#if !defined DOUG_LEA_MALLOC && !defined HYBRID_MALLOC && !defined SYSTEM_MALLOC
extern size_t __malloc_extra_blocks;
#endif
#if !HAVE_DECL_ALIGNED_ALLOC
extern void *aligned_alloc (size_t, size_t) ATTRIBUTE_MALLOC_SIZE ((2));
#endif
extern void malloc_enable_thread (void);

#ifdef REL_ALLOC
/* Defined in ralloc.c.  */
extern void *r_alloc (void **, size_t) ATTRIBUTE_ALLOC_SIZE ((2));
extern void r_alloc_free (void **);
extern void *r_re_alloc (void **, size_t) ATTRIBUTE_ALLOC_SIZE ((2));
extern void r_alloc_reset_variable (void **, void **);
extern void r_alloc_inhibit_buffer_relocation (int);
#endif

/* Defined in chartab.c.  */
extern Lisp_Object copy_char_table (Lisp_Object);
extern Lisp_Object char_table_ref_and_range (Lisp_Object, int,
                                             int *, int *);
extern void char_table_set_range (Lisp_Object, int, int, Lisp_Object);
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 Lisp_Object uniprop_table (Lisp_Object);
extern Lisp_Object get_unicode_property (Lisp_Object, int);
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;
extern void temp_output_buffer_setup (const char *);
extern int print_level;
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 int float_to_string (char *, double);
extern void init_print_once (void);
extern void syms_of_print (void);

/* Defined in doprnt.c.  */
extern ptrdiff_t doprnt (char *, ptrdiff_t, const char *, const char *,
			 va_list);
extern ptrdiff_t esprintf (char *, char const *, ...)
  ATTRIBUTE_FORMAT_PRINTF (2, 3);
extern ptrdiff_t exprintf (char **, ptrdiff_t *, char *, ptrdiff_t,
			   char const *, ...)
  ATTRIBUTE_FORMAT_PRINTF (5, 6);
extern ptrdiff_t evxprintf (char **, ptrdiff_t *, char *, ptrdiff_t,
			    char const *, va_list)
  ATTRIBUTE_FORMAT_PRINTF (5, 0);

/* Defined in lread.c.  */
/* When an object is read, the type of the top read stack entry indicates
   the syntactic context.  */
enum read_entry_type
{
# ifdef HAVE_MPS
  RE_free,
# endif
				/* preceding syntactic context */
  RE_list_start,		/* "(" */

  RE_list,			/* "(" (+ OBJECT) */
  RE_list_dot,			/* "(" (+ OBJECT) "." */

  RE_vector,			/* "[" (* OBJECT) */
  RE_record,			/* "#s(" (* OBJECT) */
  RE_char_table,		/* "#^[" (* OBJECT) */
  RE_sub_char_table,		/* "#^^[" (* OBJECT) */
  RE_byte_code,			/* "#[" (* OBJECT) */
  RE_string_props,		/* "#(" (* OBJECT) */

  RE_special,			/* "'" | "#'" | "`" | "," | ",@" */

  RE_numbered,			/* "#" (+ DIGIT) "=" */
};

struct read_stack_entry
{
  enum read_entry_type type;
  union {
    /* RE_list, RE_list_dot */
    struct {
      Lisp_Object head;		/* first cons of list */
      Lisp_Object tail;		/* last cons of list */
    } list;

    /* RE_vector, RE_record, RE_char_table, RE_sub_char_table,
       RE_byte_code, RE_string_props */
    struct {
      Lisp_Object elems;	/* list of elements in reverse order */
      bool old_locate_syms;	/* old value of locate_syms */
    } vector;

    /* RE_special */
    struct {
      Lisp_Object symbol;	/* symbol from special syntax */
    } special;

    /* RE_numbered */
    struct {
      Lisp_Object number;	/* number as a fixnum */
      Lisp_Object placeholder;	/* placeholder object */
    } numbered;
  } u;
};

struct read_stack
{
  struct read_stack_entry *stack;  /* base of stack */
  ptrdiff_t size;		   /* allocated size in entries */
  ptrdiff_t sp;			   /* current number of entries */
};

extern struct read_stack rdstack;

extern Lisp_Object intern_1 (const char *, ptrdiff_t);
extern Lisp_Object intern_c_string_1 (const char *, ptrdiff_t);
extern Lisp_Object intern_driver (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object intern_c_multibyte (const char *str,
				       ptrdiff_t nchars, ptrdiff_t nbytes);
extern void init_symbol (Lisp_Object, Lisp_Object);
extern Lisp_Object oblookup (Lisp_Object, const char *, ptrdiff_t, ptrdiff_t);
INLINE void
LOADHIST_ATTACH (Lisp_Object x)
{
  if (initialized)
    Vcurrent_load_list = Fcons (x, Vcurrent_load_list);
}
extern bool suffix_p (Lisp_Object, const char *);
extern Lisp_Object save_match_data_load (Lisp_Object, Lisp_Object, Lisp_Object,
					 Lisp_Object, Lisp_Object);
extern int openp (Lisp_Object, Lisp_Object, Lisp_Object,
                  Lisp_Object *, Lisp_Object, bool, bool,
		  void **);
enum { S2N_IGNORE_TRAILING = 1 };
extern Lisp_Object string_to_number (char const *, int, ptrdiff_t *);
extern void map_obarray (Lisp_Object, void (*) (Lisp_Object, Lisp_Object),
                         Lisp_Object);
extern void dir_warning (const char *, Lisp_Object);
extern void init_obarray_once (void);
extern void init_lread (void);
extern void syms_of_lread (void);
extern void mark_lread (void);

INLINE Lisp_Object
intern (const char *str)
{
  return intern_1 (str, strlen (str));
}

INLINE Lisp_Object
intern_c_string (const char *str)
{
  return intern_c_string_1 (str, strlen (str));
}

/* Defined in eval.c.  */
extern Lisp_Object Vautoload_queue;
extern Lisp_Object Vrun_hooks;
extern Lisp_Object Vsignaling_function;
extern Lisp_Object inhibit_lisp_code;
extern bool signal_quit_p (Lisp_Object);

/* 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 void run_hook (Lisp_Object);
extern void run_hook_with_args_2 (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object run_hook_with_args (ptrdiff_t nargs, Lisp_Object *args,
				       Lisp_Object (*funcall)
				       (ptrdiff_t nargs, Lisp_Object *args));
extern Lisp_Object quit (void);
INLINE AVOID
xsignal (Lisp_Object error_symbol, Lisp_Object data)
{
  Fsignal (error_symbol, data);
}
extern AVOID xsignal0 (Lisp_Object);
extern AVOID xsignal1 (Lisp_Object, Lisp_Object);
extern AVOID xsignal2 (Lisp_Object, Lisp_Object, Lisp_Object);
extern AVOID xsignal3 (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
extern AVOID signal_error (const char *, Lisp_Object);
extern AVOID overflow_error (void);
extern bool FUNCTIONP (Lisp_Object);
extern Lisp_Object funcall_subr (struct Lisp_Subr *subr, ptrdiff_t numargs, Lisp_Object *arg_vector);
extern Lisp_Object eval_sub (Lisp_Object form);
extern Lisp_Object apply1 (Lisp_Object, Lisp_Object);
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 (*) (ptrdiff_t, Lisp_Object *), ptrdiff_t, Lisp_Object *,
     Lisp_Object, Lisp_Object (*) (Lisp_Object, ptrdiff_t, Lisp_Object *));
extern Lisp_Object internal_catch_all (Lisp_Object (*) (void *), void *, Lisp_Object (*) (enum nonlocal_exit, Lisp_Object));
extern struct handler *push_handler (Lisp_Object, enum handlertype)
  ATTRIBUTE_RETURNS_NONNULL;
extern void pop_handler (void);
extern void push_handler_bind (Lisp_Object, Lisp_Object, int);
extern struct handler *push_handler_nosignal (Lisp_Object, enum handlertype);
extern void specbind (Lisp_Object, Lisp_Object);
extern void record_unwind_protect (void (*) (Lisp_Object), Lisp_Object);
extern void record_unwind_protect_array (Lisp_Object *, ptrdiff_t);
extern void record_unwind_protect_ptr (void (*) (void *), void *);
extern void record_unwind_protect_ptr_mark (void (*function) (void *),
					    void *arg, void (*mark) (void *));
extern void record_unwind_protect_int (void (*) (int), int);
extern void record_unwind_protect_intmax (void (*) (intmax_t), intmax_t);
extern void record_unwind_protect_void (void (*) (void));
extern void record_unwind_protect_excursion (void);
extern void record_unwind_protect_nothing (void);
extern void record_unwind_protect_module (enum specbind_tag, void *);
extern void clear_unwind_protect (specpdl_ref);
extern void set_unwind_protect (specpdl_ref, void (*) (Lisp_Object),
				Lisp_Object);
extern void set_unwind_protect_ptr (specpdl_ref, void (*) (void *), void *);
extern Lisp_Object unbind_to (specpdl_ref, Lisp_Object);
void specpdl_unrewind (union specbinding *pdl, int distance, bool vars_only);
extern AVOID error (const char *, ...) ATTRIBUTE_FORMAT_PRINTF (1, 2);
extern AVOID verror (const char *, va_list)
  ATTRIBUTE_FORMAT_PRINTF (1, 0);
extern Lisp_Object vformat_string (const char *, va_list)
  ATTRIBUTE_FORMAT_PRINTF (1, 0);
extern Lisp_Object load_with_autoload_queue
           (Lisp_Object file, Lisp_Object noerror, Lisp_Object nomessage,
            Lisp_Object nosuffix, Lisp_Object must_suffix);
extern Lisp_Object call_debugger (Lisp_Object arg);
extern void init_eval_once (void);
extern Lisp_Object safe_funcall (ptrdiff_t, Lisp_Object*);
#define safe_calln(...) \
  CALLMANY (safe_funcall, ((Lisp_Object []) {__VA_ARGS__}))

extern void init_eval (void);
extern void syms_of_eval (void);
extern void prog_ignore (Lisp_Object);
extern void mark_specpdl (union specbinding *first, union specbinding *ptr);
extern void get_backtrace (Lisp_Object *array, ptrdiff_t size);
Lisp_Object backtrace_top_function (void);
extern bool let_shadows_buffer_binding_p (struct Lisp_Symbol *symbol);
void do_debug_on_call (Lisp_Object code, specpdl_ref count);
Lisp_Object funcall_general (Lisp_Object fun,
			     ptrdiff_t numargs, Lisp_Object *args);

/* Defined in unexmacosx.c.  */
#if defined DARWIN_OS && defined HAVE_UNEXEC
extern void unexec_init_emacs_zone (void);
extern void *unexec_malloc (size_t);
extern void *unexec_realloc (void *, size_t);
extern void unexec_free (void *);
#endif

/* The definition of Lisp_Module_Function depends on emacs-module.h,
   so we don't define it here.  It's defined in emacs-module.c.  */

INLINE bool
MODULE_FUNCTIONP (Lisp_Object o)
{
  return PSEUDOVECTORP (o, PVEC_MODULE_FUNCTION);
}

INLINE struct Lisp_Module_Function *
XMODULE_FUNCTION (Lisp_Object o)
{
  eassert (MODULE_FUNCTIONP (o));
  struct Lisp_Module_Function *f
    = XUNTAG (o, Lisp_Vectorlike, struct Lisp_Module_Function);
  igc_check_fwd (f, true);
  return f;
}

#ifdef HAVE_MODULES
/* A function pointer type good enough for lisp.h.  Actual module
   function pointers are of a different type that relies on details
   internal to emacs-module.c.  */
typedef void (*module_funcptr) (void);

/* Defined in alloc.c.  */
void set_string_marked (struct Lisp_String *s);
void mark_interval_tree (INTERVAL i);

extern Lisp_Object make_user_ptr (void (*finalizer) (void *), void *p);

/* Defined in emacs-module.c.  */
extern Lisp_Object funcall_module (Lisp_Object, ptrdiff_t, Lisp_Object *);
extern Lisp_Object module_function_arity (const struct Lisp_Module_Function *);
extern Lisp_Object module_function_documentation
  (struct Lisp_Module_Function const *);
extern Lisp_Object module_function_interactive_form
  (const struct Lisp_Module_Function *);
extern Lisp_Object module_function_command_modes
  (const struct Lisp_Module_Function *);
extern module_funcptr module_function_address
  (struct Lisp_Module_Function const *);
extern void *module_function_data (const struct Lisp_Module_Function *);
extern void module_finalize_function (const struct Lisp_Module_Function *);
extern void mark_module_environment (void *);
extern void finalize_runtime_unwind (void *);
extern void finalize_environment_unwind (void *);
extern void init_module_assertions (bool);
extern void syms_of_module (void);
#endif

/* Defined in thread.c.  */
extern void mark_threads (void);
extern void unmark_main_thread (void);

/* Defined in editfns.c.  */
extern void insert1 (Lisp_Object);
extern void find_field (Lisp_Object, Lisp_Object, Lisp_Object,
			ptrdiff_t *, Lisp_Object, ptrdiff_t *);
extern void save_excursion_save (union specbinding *);
extern void save_excursion_restore (Lisp_Object, Lisp_Object);
extern Lisp_Object save_restriction_save (void);
extern void save_restriction_restore (Lisp_Object);
extern Lisp_Object make_buffer_string (ptrdiff_t, ptrdiff_t, bool);
extern Lisp_Object make_buffer_string_both (ptrdiff_t, ptrdiff_t, ptrdiff_t,
					    ptrdiff_t, bool);
extern void labeled_narrow_to_region (Lisp_Object, Lisp_Object, Lisp_Object);
extern void reset_outermost_restrictions (void);
extern void labeled_restrictions_remove_in_current_buffer (void);
extern void init_editfns (void);
extern void syms_of_editfns (void);

/* Defined in buffer.c.  */
extern bool mouse_face_overlay_overlaps (Lisp_Object);
extern bool disable_line_numbers_overlay_at_eob (void);
extern AVOID nsberror (Lisp_Object);
extern void adjust_overlays_for_insert (ptrdiff_t, ptrdiff_t, bool);
extern void adjust_overlays_for_delete (ptrdiff_t, ptrdiff_t);
extern void fix_start_end_in_overlays (ptrdiff_t, ptrdiff_t);
extern void report_overlay_modification (Lisp_Object, Lisp_Object, bool,
                                         Lisp_Object, Lisp_Object, Lisp_Object);
extern bool overlay_touches_p (ptrdiff_t);
extern Lisp_Object other_buffer_safely (Lisp_Object);
extern void init_buffer_once (void);
extern void init_buffer (void);
extern void syms_of_buffer (void);

/* Defined in marker.c.  */

extern ptrdiff_t marker_position (Lisp_Object);
extern ptrdiff_t marker_byte_position (Lisp_Object);
extern void clear_charpos_cache (struct buffer *);
extern ptrdiff_t buf_charpos_to_bytepos (struct buffer *, ptrdiff_t);
extern ptrdiff_t buf_bytepos_to_charpos (struct buffer *, ptrdiff_t);
extern void detach_marker (Lisp_Object);
extern void unchain_marker (struct Lisp_Marker *);
extern Lisp_Object set_marker_restricted (Lisp_Object, Lisp_Object, Lisp_Object);
extern Lisp_Object set_marker_both (Lisp_Object, Lisp_Object, ptrdiff_t, ptrdiff_t);
extern Lisp_Object set_marker_restricted_both (Lisp_Object, Lisp_Object,
                                               ptrdiff_t, ptrdiff_t);
extern Lisp_Object build_marker (struct buffer *, ptrdiff_t, ptrdiff_t);
extern void syms_of_marker (void);

/* Defined in fileio.c.  */

extern Lisp_Object file_name_directory (Lisp_Object);
extern char *splice_dir_file (char *, char const *, char const *)
  ATTRIBUTE_RETURNS_NONNULL;
extern bool file_name_absolute_p (const char *);
extern char const *get_homedir (void) ATTRIBUTE_RETURNS_NONNULL;
extern Lisp_Object expand_and_dir_to_file (Lisp_Object);
extern Lisp_Object write_region (Lisp_Object, Lisp_Object, Lisp_Object,
				 Lisp_Object, Lisp_Object, Lisp_Object,
				 Lisp_Object, int);
extern void close_file_unwind (int);
extern void fclose_unwind (void *);
extern void restore_point_unwind (Lisp_Object);
extern bool file_access_p (char const *, int);
extern Lisp_Object get_file_errno_data (const char *, Lisp_Object, int);
extern AVOID report_file_errno (const char *, Lisp_Object, int);
extern AVOID report_file_error (const char *, Lisp_Object);
extern AVOID report_file_notify_error (const char *, Lisp_Object);
extern Lisp_Object file_attribute_errno (Lisp_Object, int);
extern bool internal_delete_file (Lisp_Object);
extern Lisp_Object check_emacs_readlinkat (int, Lisp_Object, char const *);
extern bool file_directory_p (Lisp_Object);
extern bool file_accessible_directory_p (Lisp_Object);
extern Lisp_Object buffer_visited_file_modtime (struct buffer *);
extern void init_fileio (void);
extern void syms_of_fileio (void);

/* Defined in search.c.  */
extern void shrink_regexp_cache (void);
extern void restore_search_regs (void);
extern void update_search_regs (ptrdiff_t oldstart,
                                ptrdiff_t oldend, ptrdiff_t newend);
extern void record_unwind_save_match_data (void);
extern ptrdiff_t fast_string_match_internal (Lisp_Object, Lisp_Object,
					     Lisp_Object);
extern ptrdiff_t fast_c_string_match_internal (Lisp_Object, const char *,
					       ptrdiff_t, Lisp_Object);

INLINE ptrdiff_t
fast_string_match (Lisp_Object regexp, Lisp_Object string)
{
  return fast_string_match_internal (regexp, string, Qnil);
}

INLINE ptrdiff_t
fast_string_match_ignore_case (Lisp_Object regexp, Lisp_Object string)
{
  return fast_string_match_internal (regexp, string, Vascii_canon_table);
}

INLINE ptrdiff_t
fast_c_string_match (Lisp_Object regexp,
		     const char *string, ptrdiff_t len)
{
  return fast_c_string_match_internal (regexp, string, len, Qnil);
}

INLINE ptrdiff_t
fast_c_string_match_ignore_case (Lisp_Object regexp,
				 const char *string, ptrdiff_t len)
{
  return fast_c_string_match_internal (regexp, string, len,
				       Vascii_canon_table);
}

extern ptrdiff_t fast_looking_at (Lisp_Object, ptrdiff_t, ptrdiff_t,
                                  ptrdiff_t, ptrdiff_t, Lisp_Object);
extern ptrdiff_t find_newline1 (ptrdiff_t, ptrdiff_t, ptrdiff_t, ptrdiff_t,
                               ptrdiff_t, ptrdiff_t *, ptrdiff_t *, bool);
extern ptrdiff_t find_newline (ptrdiff_t, ptrdiff_t, ptrdiff_t, ptrdiff_t,
			       ptrdiff_t, ptrdiff_t *, ptrdiff_t *, bool);
extern void scan_newline (ptrdiff_t, ptrdiff_t, ptrdiff_t, ptrdiff_t,
			  ptrdiff_t, bool);
extern ptrdiff_t scan_newline_from_point (ptrdiff_t, ptrdiff_t *, ptrdiff_t *);
extern ptrdiff_t find_newline_no_quit (ptrdiff_t, ptrdiff_t,
				       ptrdiff_t, ptrdiff_t *);
extern ptrdiff_t find_before_next_newline (ptrdiff_t, ptrdiff_t,
					   ptrdiff_t, ptrdiff_t *);
extern EMACS_INT search_buffer (Lisp_Object, ptrdiff_t, ptrdiff_t,
				ptrdiff_t, ptrdiff_t, EMACS_INT,
				bool, Lisp_Object, Lisp_Object, bool);
extern void syms_of_search (void);
extern void clear_regexp_cache (void);

/* Defined in minibuf.c.  */

extern Lisp_Object Vminibuffer_list;
extern Lisp_Object last_minibuf_string;
extern void move_minibuffers_onto_frame (struct frame *, Lisp_Object, bool);
extern bool is_minibuffer (EMACS_INT, Lisp_Object);
extern EMACS_INT this_minibuffer_depth (Lisp_Object);
extern EMACS_INT minibuf_level;
extern Lisp_Object get_minibuffer (EMACS_INT);
extern void init_minibuf_once (void);
extern void set_initial_minibuffer_mode (void);
extern void syms_of_minibuf (void);
extern void barf_if_interaction_inhibited (void);

/* Defined in callint.c.  */

extern void syms_of_callint (void);

/* Defined in casefiddle.c.  */

extern void syms_of_casefiddle (void);

/* Defined in casetab.c.  */

extern void init_casetab_once (void);
extern void syms_of_casetab (void);

/* Defined in keyboard.c.  */

extern EMACS_INT command_loop_level;
extern Lisp_Object echo_message_buffer;
extern struct kboard *echo_kboard;
extern void cancel_echoing (void);
extern bool input_pending;
#ifdef HAVE_STACK_OVERFLOW_HANDLING
extern sigjmp_buf return_to_command_loop;
#endif
extern Lisp_Object menu_bar_items (Lisp_Object);
extern Lisp_Object tab_bar_items (Lisp_Object, int *);
extern Lisp_Object tool_bar_items (Lisp_Object, int *);
extern void discard_mouse_events (void);
#if defined (USABLE_SIGIO) || defined (USABLE_SIGPOLL)
void handle_input_available_signal (int);
#endif
extern Lisp_Object pending_funcalls;
extern bool detect_input_pending (void);
extern bool detect_input_pending_ignore_squeezables (void);
extern bool detect_input_pending_run_timers (bool);
extern void safe_run_hooks (Lisp_Object);
extern void safe_run_hooks_2 (Lisp_Object, Lisp_Object, Lisp_Object);
extern void cmd_error_internal (Lisp_Object, const char *);
extern Lisp_Object command_loop_2 (Lisp_Object);
extern Lisp_Object read_menu_command (void);
extern Lisp_Object recursive_edit_1 (void);
extern void record_auto_save (void);
extern void force_auto_save_soon (void);
extern void init_keyboard (void);
extern void syms_of_keyboard (void);
extern void keys_of_keyboard (void);

/* Defined in indent.c.  */
extern ptrdiff_t current_column (void);
extern void line_number_display_width (struct window *, int *, int *);
extern void invalidate_current_column (void);
extern bool indented_beyond_p (ptrdiff_t, ptrdiff_t, EMACS_INT);
extern void syms_of_indent (void);

/* Defined in frame.c.  */
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);
extern Lisp_Object get_frame_param (struct frame *, Lisp_Object);
extern void frames_discard_buffer (Lisp_Object);
extern void init_frame_once (void);
extern void syms_of_frame (void);

/* Defined in emacs.c.  */
extern char **initial_argv;
extern int initial_argc;
extern char const *emacs_wd;
#if defined (HAVE_X_WINDOWS) || defined (HAVE_PGTK) || defined (HAVE_NS)
extern bool display_arg;
#endif
extern Lisp_Object decode_env_path (const char *, const char *, bool);
extern Lisp_Object empty_unibyte_string, empty_multibyte_string;
extern AVOID terminate_due_to_signal (int, int);
#ifdef WINDOWSNT
extern Lisp_Object Vlibrary_cache;
#endif
void fixup_locale (void);
void synchronize_system_messages_locale (void);
void synchronize_system_time_locale (void);
extern char *emacs_strerror (int) ATTRIBUTE_RETURNS_NONNULL;
extern void shut_down_emacs (int, Lisp_Object);

/* True means don't do interactive redisplay and don't change tty modes.  */
extern bool noninteractive;

/* True means remove site-lisp directories from load-path.  */
extern bool no_site_lisp;

/* True means put details like time stamps into builds.  */
extern bool build_details;

#ifndef WINDOWSNT
/* 0 not a daemon, 1 foreground daemon, 2 background daemon.  */
extern int daemon_type;
#define IS_DAEMON (daemon_type != 0)
/* Non-zero means daemon-initialized has not yet been called.  */
#define DAEMON_RUNNING (daemon_type >= 0)
#else  /* WINDOWSNT */
extern void *w32_daemon_event;
#define IS_DAEMON (w32_daemon_event != NULL)
#define DAEMON_RUNNING (w32_daemon_event != INVALID_HANDLE_VALUE)
#endif

/* True if handling a fatal error already.  */
extern bool fatal_error_in_progress;

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

/* Defined in process.c.  */
struct Lisp_Process;
extern void child_signal_init (void);
extern void kill_buffer_processes (Lisp_Object);
extern int wait_reading_process_output (intmax_t, int, int, bool, Lisp_Object,
					struct Lisp_Process *, int);
/* Max value for the first argument of wait_reading_process_output.  */
#if GNUC_PREREQ (3, 0, 0) && ! GNUC_PREREQ (4, 6, 0)
/* Work around a bug in GCC 3.4.2, known to be fixed in GCC 4.6.0.
   The bug merely causes a bogus warning, but the warning is annoying.  */
# define WAIT_READING_MAX min (TYPE_MAXIMUM (time_t), INTMAX_MAX)
#else
# define WAIT_READING_MAX INTMAX_MAX
#endif
#ifdef HAVE_TIMERFD
extern void add_timer_wait_descriptor (int);
#endif
extern void add_keyboard_wait_descriptor (int);
extern void delete_keyboard_wait_descriptor (int);
#ifdef HAVE_GPM
extern void add_gpm_wait_descriptor (int);
extern void delete_gpm_wait_descriptor (int);
#endif
extern void init_process_emacs (int);
extern void syms_of_process (void);
extern void setup_process_coding_systems (Lisp_Object);

/* Defined in callproc.c.  */
#ifdef DOS_NT
# define CHILD_SETUP_ERROR_DESC "Spawning child process"
#else
# define CHILD_SETUP_ERROR_DESC "Doing vfork"
#endif

extern int emacs_spawn (pid_t *, int, int, int, char **, char **,
                        const char *, const char *, bool, bool,
                        const sigset_t *);
extern char **make_environment_block (Lisp_Object) ATTRIBUTE_RETURNS_NONNULL;
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 get_doc_string (Lisp_Object, bool);
extern void syms_of_doc (void);

/* Defined in bytecode.c.  */
extern void syms_of_bytecode (void);
extern Lisp_Object exec_byte_code (Lisp_Object, ptrdiff_t,
				   ptrdiff_t, Lisp_Object *);
extern Lisp_Object get_byte_code_arity (Lisp_Object);
extern void init_bc_thread (struct bc_thread_state *bc);
extern void free_bc_thread (struct bc_thread_state *bc);
extern void mark_bytecode (struct bc_thread_state *bc);
#ifdef HAVE_MPS
extern void *bc_next_frame (struct bc_frame *bc);
# endif

INLINE struct bc_frame *
get_act_rec (struct thread_state *th)
{
  return th->bc.fp;
}

INLINE void
set_act_rec (struct thread_state *th, struct bc_frame *act_rec)
{
  th->bc.fp = act_rec;
}

/* Defined in macros.c.  */
extern void init_macros (void);
extern void syms_of_macros (void);

/* Defined in undo.c.  */
extern void truncate_undo_list (struct buffer *);
extern void record_insert (ptrdiff_t, ptrdiff_t);
extern void record_delete (ptrdiff_t, Lisp_Object, bool);
extern void record_first_change (void);
extern void record_change (ptrdiff_t, ptrdiff_t);
extern void record_property_change (ptrdiff_t, ptrdiff_t,
				    Lisp_Object, Lisp_Object,
                                    Lisp_Object);
extern void syms_of_undo (void);

/* Defined in textprop.c.  */
extern void report_interval_modification (Lisp_Object, Lisp_Object);

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

/* Defined in xmenu.c.  */
extern void syms_of_xmenu (void);

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

/* Defined in sysdep.c.  */
#ifdef HAVE_PERSONALITY_ADDR_NO_RANDOMIZE
extern int maybe_disable_address_randomization (int, char **);
#else
INLINE int
maybe_disable_address_randomization (int argc, char **argv)
{
  return argc;
}
#endif
extern int emacs_exec_file (char const *, char *const *, char *const *);
extern void init_standard_fds (void);
extern char *emacs_get_current_dir_name (void);
extern void stuff_char (char c);
extern void init_foreground_group (void);
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 child_setup_tty (int);
extern void setup_pty (int);
extern int set_window_size (int, int, int);
extern EMACS_INT get_random (void);
extern unsigned long int get_random_ulong (void);
extern void seed_random (void *, ptrdiff_t);
extern void init_random (void);
extern void emacs_backtrace (int);
extern AVOID emacs_abort (void) NO_INLINE;
extern int emacs_fstatat (int, char const *, void *, int);
#ifdef HAVE_SYS_STAT_H
extern int sys_fstat (int, struct stat *);
#endif
extern int sys_faccessat (int, const char *, int, int);
#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
extern int emacs_openat (int, char const *, int, int);
#endif
extern int emacs_open (const char *, int, int);
extern int emacs_open_noquit (const char *, int, int);
extern int emacs_pipe (int[2]);
extern int emacs_close (int);
#if !(defined HAVE_ANDROID && !defined ANDROID_STUBIFY)
# define emacs_fclose fclose
#else
extern int emacs_fclose (FILE *);
#endif
extern FILE *emacs_fdopen (int, const char *)
  ATTRIBUTE_MALLOC ATTRIBUTE_DEALLOC (emacs_fclose, 1);
extern FILE *emacs_fopen (char const *, char const *)
  ATTRIBUTE_MALLOC ATTRIBUTE_DEALLOC (emacs_fclose, 1);
extern int emacs_unlink (const char *);
extern int emacs_symlink (const char *, const char *);
extern int emacs_rmdir (const char *);
extern int emacs_mkdir (const char *, mode_t);
extern int emacs_renameat_noreplace (int, const char *, int,
				     const char *);
extern int emacs_rename (const char *, const char *);
extern int emacs_fchmodat (int, const char *, mode_t, int);
extern ptrdiff_t emacs_read (int, void *, ptrdiff_t);
extern ptrdiff_t emacs_read_quit (int, void *, ptrdiff_t);
extern ptrdiff_t emacs_write (int, void const *, ptrdiff_t);
extern ptrdiff_t emacs_write_sig (int, void const *, ptrdiff_t);
extern ptrdiff_t emacs_write_quit (int, void const *, ptrdiff_t);
extern void emacs_perror (char const *);
extern int renameat_noreplace (int, char const *, int, char const *);
extern int str_collate (Lisp_Object, Lisp_Object, Lisp_Object, Lisp_Object);
extern void syms_of_sysdep (void);

/* Defined in filelock.c.  */
extern void unlock_all_files (void);
extern void unlock_buffer (struct buffer *);
extern void syms_of_filelock (void);

/* Defined in sound.c.  */
extern void syms_of_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,
                                             bool, Lisp_Object, Lisp_Object);

/* Defined in term.c.  */
#ifndef HAVE_ANDROID
extern int *char_ins_del_vector;
#endif
extern void syms_of_term (void);
extern AVOID fatal (const char *msgid, ...) ATTRIBUTE_FORMAT_PRINTF (1, 2);

/* Defined in terminal.c.  */
extern void syms_of_terminal (void);
extern char * tty_type_name (Lisp_Object);

/* 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);
#endif

/* Defined in inotify.c */
#ifdef HAVE_INOTIFY
extern void syms_of_inotify (void);
#endif

/* Defined in kqueue.c */
#ifdef HAVE_KQUEUE
extern void globals_of_kqueue (void);
extern void syms_of_kqueue (void);
#endif

/* Defined in gfilenotify.c */
#ifdef HAVE_GFILENOTIFY
extern void globals_of_gfilenotify (void);
extern void syms_of_gfilenotify (void);
#endif

#ifdef HAVE_W32NOTIFY
/* Defined on w32notify.c.  */
extern void syms_of_w32notify (void);
#endif

#if defined HAVE_NTGUI || defined CYGWIN
/* Defined in w32cygwinx.c.  */
extern void syms_of_w32cygwinx (void);
#endif

/* Defined in xfaces.c.  */
extern Lisp_Object Vface_alternative_font_family_alist;
extern Lisp_Object Vface_alternative_font_registry_alist;
extern void syms_of_xfaces (void);
extern void init_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 init_xterm (void);
extern void syms_of_xterm (void);
#endif /* HAVE_X_WINDOWS */

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

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

#ifdef HAVE_LCMS2
/* Defined in lcms.c.  */
extern void syms_of_lcms2 (void);
#endif

#ifdef HAVE_ZLIB

#include <stdio.h>

/* Defined in decompress.c.  */
extern int md5_gz_stream (FILE *, void *);
extern void syms_of_decompress (void);
#endif

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


/* Defined in profiler.c.  */
extern bool profiler_memory_running;
extern void malloc_probe (size_t);
extern void syms_of_profiler (void);
extern void mark_profiler (void);


#ifdef DOS_NT
/* Defined in msdos.c, w32.c.  */
extern char *emacs_root_dir (void);
#endif /* DOS_NT */

#ifdef HAVE_TEXT_CONVERSION
/* Defined in textconv.c.  */
extern void reset_frame_state (struct frame *);
extern void reset_frame_conversion (struct frame *);
extern void report_selected_window_change (struct frame *);
extern void report_point_change (struct frame *, struct window *,
				 struct buffer *);
extern void disable_text_conversion (void);
extern void resume_text_conversion (void);
extern void syms_of_textconv (void);
#endif

#ifdef HAVE_NATIVE_COMP
INLINE bool
NATIVE_COMP_FUNCTIONP (Lisp_Object a)
{
  return SUBRP (a) && !NILP (XSUBR (a)->native_comp_u);
}

INLINE bool
NATIVE_COMP_FUNCTION_DYNP (Lisp_Object a)
{
  return NATIVE_COMP_FUNCTIONP (a) && !NILP (XSUBR (a)->lambda_list);
}

INLINE Lisp_Object
SUBR_TYPE (Lisp_Object a)
{
  return XSUBR (a)->type;
}

INLINE struct Lisp_Native_Comp_Unit *
allocate_native_comp_unit (void)
{
  return ALLOCATE_ZEROED_PSEUDOVECTOR (struct Lisp_Native_Comp_Unit,
				       data_impure_vec, PVEC_NATIVE_COMP_UNIT);
}
#else
INLINE bool
NATIVE_COMP_FUNCTIONP (Lisp_Object a)
{
  return false;
}

INLINE bool
NATIVE_COMP_FUNCTION_DYNP (Lisp_Object a)
{
  return false;
}

#endif

/* Defined in lastfile.c.  */
extern char my_edata[];
extern char my_endbss[];
extern char *my_endbss_static;

extern void *xmalloc (size_t)
  ATTRIBUTE_MALLOC_SIZE ((1)) ATTRIBUTE_RETURNS_NONNULL;
extern void *xzalloc (size_t)
  ATTRIBUTE_MALLOC_SIZE ((1)) ATTRIBUTE_RETURNS_NONNULL;
extern void *xrealloc (void *, size_t)
  ATTRIBUTE_ALLOC_SIZE ((2)) ATTRIBUTE_RETURNS_NONNULL;
extern void xfree (void *);
extern void *xnmalloc (ptrdiff_t, ptrdiff_t)
  ATTRIBUTE_MALLOC_SIZE ((1,2)) ATTRIBUTE_RETURNS_NONNULL;
extern void *xnrealloc (void *, ptrdiff_t, ptrdiff_t)
  ATTRIBUTE_ALLOC_SIZE ((2,3)) ATTRIBUTE_RETURNS_NONNULL;
extern void *xpalloc (void *, ptrdiff_t *, ptrdiff_t, ptrdiff_t, ptrdiff_t)
  ATTRIBUTE_RETURNS_NONNULL;

extern char *xstrdup (char const *)
  ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
extern char *xlispstrdup (Lisp_Object)
  ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
extern void dupstring (char **, char const *);

/* Make DEST a copy of STRING's data.  Return a pointer to DEST's terminating
   null byte.  This is like stpcpy, except the source is a Lisp string.  */

INLINE char *
lispstpcpy (char *dest, Lisp_Object string)
{
  ptrdiff_t len = SBYTES (string);
  memcpy (dest, SDATA (string), len + 1);
  return dest + len;
}

#if (defined HAVE___LSAN_IGNORE_OBJECT \
     && defined HAVE_SANITIZER_LSAN_INTERFACE_H)
# include <sanitizer/lsan_interface.h>
#else
/* Treat *P as a non-leak.  */
INLINE void
__lsan_ignore_object (void const *p)
{
}
#endif

extern void xputenv (const char *);

extern char *egetenv_internal (const char *, ptrdiff_t);

INLINE char *
egetenv (const char *var)
{
  /* When VAR is a string literal, strlen can be optimized away.  */
  return egetenv_internal (var, strlen (var));
}

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

/* Return the absolute value of X.  X should be a signed integer
   expression without side effects, and X's absolute value should not
   exceed the maximum for its promoted type.  This is called 'eabs'
   because 'abs' is reserved by the C standard.  */
#define eabs(x)         ((x) < 0 ? -(x) : (x))

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

enum MAX_ALLOCA { MAX_ALLOCA = 16 * 1024 };

extern void *record_xmalloc (size_t)
  ATTRIBUTE_ALLOC_SIZE ((1)) ATTRIBUTE_RETURNS_NONNULL;

#define USE_SAFE_ALLOCA			\
  ptrdiff_t sa_avail = MAX_ALLOCA;	\
  specpdl_ref sa_count = SPECPDL_INDEX ()

#define AVAIL_ALLOCA(size) (sa_avail -= (size), alloca (size))

/* SAFE_ALLOCA allocates a simple buffer.  */

#define SAFE_ALLOCA(size) ((size) <= sa_avail				\
			   ? AVAIL_ALLOCA (size)			\
			   : record_xmalloc (size))

/* SAFE_NALLOCA sets BUF to a newly allocated array of MULTIPLIER *
   NITEMS items, each of the same type as *BUF.  MULTIPLIER must
   positive.  The code is tuned for MULTIPLIER being a constant.  */

#define SAFE_NALLOCA(buf, multiplier, nitems)			 \
  do {								 \
    if ((nitems) <= sa_avail / sizeof *(buf) / (multiplier))	 \
      (buf) = AVAIL_ALLOCA (sizeof *(buf) * (multiplier) * (nitems)); \
    else							 \
      {								 \
	(buf) = xnmalloc (nitems, sizeof *(buf) * (multiplier)); \
	record_unwind_protect_ptr (xfree, buf);			 \
      }								 \
  } while (false)

/* SAFE_ALLOCA_STRING allocates a C copy of a Lisp string.  */

#define SAFE_ALLOCA_STRING(ptr, string)			\
  do {							\
    (ptr) = SAFE_ALLOCA (SBYTES (string) + 1);		\
    memcpy (ptr, SDATA (string), SBYTES (string) + 1);	\
  } while (false)

#ifdef HAVE_MPS
Lisp_Object *igc_alloc_lisp_obj_vec (size_t n);
#define SAFE_ALLOCA_XZALLOC(n, nbytes) igc_alloc_lisp_obj_vec (n)
#define SAFE_ALLOCA_XFREE(p) (void) 0
#else
#define SAFE_ALLOCA_XZALLOC(n, nbytes) xzalloc (nbytes)
#define SAFE_ALLOCA_XFREE(p) xfree (p)
#endif

/* Free xmalloced memory and enable GC as needed.  */

#define SAFE_FREE() safe_free (sa_count)

INLINE void
safe_free (specpdl_ref sa_count)
{
  while (specpdl_ptr != specpdl_ref_to_ptr (sa_count))
    {
      specpdl_ptr--;
      if (specpdl_ptr->kind == SPECPDL_UNWIND_PTR)
	{
	  eassert (specpdl_ptr->unwind_ptr.func == xfree);
	  xfree (specpdl_ptr->unwind_ptr.arg);
	}
      else
	{
	  eassert (specpdl_ptr->kind == SPECPDL_UNWIND_ARRAY);
	  SAFE_ALLOCA_XFREE (specpdl_ptr->unwind_array.array);
	}
    }
}

/* Pop the specpdl stack back to COUNT, and return VAL.
   Prefer this to { SAFE_FREE (); unbind_to (COUNT, VAL); }
   when COUNT predates USE_SAFE_ALLOCA, as it is a bit more efficient
   and also lets callers intermix SAFE_ALLOCA calls with other calls
   that grow the specpdl stack.  */

#define SAFE_FREE_UNBIND_TO(count, val) \
  safe_free_unbind_to (count, sa_count, val)

INLINE Lisp_Object
safe_free_unbind_to (specpdl_ref count, specpdl_ref sa_count, Lisp_Object val)
{
  eassert (!specpdl_ref_lt (sa_count, count));
  return unbind_to (count, val);
}

/* Work around GCC bug 109577
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109577
   which causes GCC to mistakenly complain about the
   memory allocation in SAFE_ALLOCA_LISP_EXTRA.  */
#if __GNUC__ == 13 && __GNUC_MINOR__ < 3
# pragma GCC diagnostic ignored "-Wanalyzer-allocation-size"
# endif

/* Set BUF to point to an allocated array of NELT Lisp_Objects,
   immediately followed by EXTRA spare bytes.  */

#define SAFE_ALLOCA_LISP_EXTRA(buf, nelt, extra)	       \
  do {							       \
    ptrdiff_t alloca_nbytes;				       \
    if (ckd_mul (&alloca_nbytes, nelt, word_size)	       \
	|| ckd_add (&alloca_nbytes, alloca_nbytes, extra)      \
	|| SIZE_MAX < alloca_nbytes)			       \
      memory_full (SIZE_MAX);				       \
    else if (alloca_nbytes <= sa_avail)			       \
      (buf) = AVAIL_ALLOCA (alloca_nbytes);		       \
    else						       \
      {							       \
	/* Although only the first nelt words need clearing,   \
	   typically EXTRA is 0 or small so just use xzalloc;  \
	   this is simpler and often faster.  */	       \
        (buf) = SAFE_ALLOCA_XZALLOC (nelt, alloca_nbytes);     \
        record_unwind_protect_array (buf, nelt);	       \
      }							       \
  } while (false)

/* Set BUF to point to an allocated array of NELT Lisp_Objects.  */

#define SAFE_ALLOCA_LISP(buf, nelt) SAFE_ALLOCA_LISP_EXTRA (buf, nelt, 0)


/* If USE_STACK_LISP_OBJECTS, define macros and functions that
   allocate some Lisp objects on the C stack.  As the storage is not
   managed by the garbage collector, these objects are dangerous:
   passing them to user code could result in undefined behavior if the
   objects are in use after the C function returns.  Conversely, these
   objects have better performance because GC is not involved.

   While debugging you may want to disable allocation on the C stack.
   Build with CPPFLAGS='-DUSE_STACK_LISP_OBJECTS=0' to disable it.  */

#if (!defined USE_STACK_LISP_OBJECTS \
     && defined __GNUC__ && !defined __clang__ && ! GNUC_PREREQ (4, 3, 2))
  /* Work around GCC bugs 36584 and 35271, which were fixed in GCC 4.3.2.  */
# define USE_STACK_LISP_OBJECTS false
#endif
#ifndef USE_STACK_LISP_OBJECTS
# define USE_STACK_LISP_OBJECTS true
# endif

# ifdef HAVE_MPS
# undef USE_STACK_LISP_OBJECTS
# define USE_STACK_LISP_OBJECTS false
# endif


#ifdef GC_CHECK_STRING_BYTES
enum { defined_GC_CHECK_STRING_BYTES = true };
#else
enum { defined_GC_CHECK_STRING_BYTES = false };
#endif

/* True for stack-based cons and string implementations, respectively.
   Use stack-based strings only if stack-based cons also works.
   Otherwise, STACK_CONS would create heap-based cons cells that
   could point to stack-based strings, which is a no-no.  */

enum
  {
    USE_STACK_CONS = USE_STACK_LISP_OBJECTS,
    USE_STACK_STRING = (USE_STACK_CONS
			&& !defined_GC_CHECK_STRING_BYTES)
  };

/* Auxiliary macros used for auto allocation of Lisp objects.  Please
   use these only in macros like AUTO_CONS that declare a local
   variable whose lifetime will be clear to the programmer.  */
#define STACK_CONS(a, b) \
  make_lisp_ptr (&((struct Lisp_Cons) { GC_HEADER_INIT { {  a, {b}}}}), \
		 Lisp_Cons)
#define AUTO_CONS_EXPR(a, b) \
  (USE_STACK_CONS ? STACK_CONS (a, b) : Fcons (a, b))

/* Declare NAME as an auto Lisp cons or short list if possible, a
   GC-based one otherwise.  This is in the sense of the C keyword
   'auto'; i.e., the object has the lifetime of the containing block.
   The resulting object should not be made visible to user Lisp code.  */

#define AUTO_CONS(name, a, b) Lisp_Object name = AUTO_CONS_EXPR (a, b)
#define AUTO_LIST1(name, a)						\
  Lisp_Object name = (USE_STACK_CONS ? STACK_CONS (a, Qnil) : list1 (a))
#define AUTO_LIST2(name, a, b)						\
  Lisp_Object name = (USE_STACK_CONS					\
		      ? STACK_CONS (a, STACK_CONS (b, Qnil))		\
		      : list2 (a, b))
#define AUTO_LIST3(name, a, b, c)					\
  Lisp_Object name = (USE_STACK_CONS					\
		      ? STACK_CONS (a, STACK_CONS (b, STACK_CONS (c, Qnil))) \
		      : list3 (a, b, c))
#define AUTO_LIST4(name, a, b, c, d)					\
    Lisp_Object name							\
      = (USE_STACK_CONS							\
	 ? STACK_CONS (a, STACK_CONS (b, STACK_CONS (c,			\
						     STACK_CONS (d, Qnil)))) \
	 : list4 (a, b, c, d))

/* Declare NAME as an auto Lisp string if possible, a GC-based one if not.
   Take its unibyte value from the null-terminated string STR,
   an expression that should not have side effects.
   STR's value is not necessarily copied.  The resulting Lisp string
   should not be modified or given text properties or made visible to
   user code.  */

#define AUTO_STRING(name, str) \
  AUTO_STRING_WITH_LEN (name, str, strlen (str))

/* Declare NAME as an auto Lisp string if possible, a GC-based one if not.
   Take its unibyte value from the null-terminated string STR with length LEN.
   STR may have side effects and may contain null bytes.
   STR's value is not necessarily copied.  The resulting Lisp string
   should not be modified or given text properties or made visible to
   user code.  */

#define AUTO_STRING_WITH_LEN(name, str, len)				\
  Lisp_Object name =							\
    (USE_STACK_STRING							\
     ? (make_lisp_ptr							\
	((&(struct Lisp_String) { GC_HEADER_INIT {			\
	      {len, -1, 0, (unsigned char *) (str)}}}),			\
	  Lisp_String))							\
     : make_unibyte_string (str, len))

/* The maximum length of "small" lists, as a heuristic.  These lists
   are so short that code need not check for cycles or quits while
   traversing.  */
enum { SMALL_LIST_LEN_MAX = 127 };

/* Loop over conses of the list TAIL, signaling if a cycle is found,
   and possibly quitting after each loop iteration.  In the loop body,
   set TAIL to the current cons.  If the loop exits normally,
   set TAIL to the terminating non-cons, typically nil.  The loop body
   should not modify the list’s top level structure other than by
   perhaps deleting the current cons.  */

#define FOR_EACH_TAIL(tail) \
  FOR_EACH_TAIL_INTERNAL (tail, circular_list (tail), true)

/* Like FOR_EACH_TAIL (TAIL), except do not signal or quit.
   If the loop exits due to a cycle, TAIL’s value is undefined.  */

#define FOR_EACH_TAIL_SAFE(tail) \
  FOR_EACH_TAIL_INTERNAL (tail, (void) ((tail) = Qnil), false)

/* Iterator intended for use only within FOR_EACH_TAIL_INTERNAL.  */
struct for_each_tail_internal
{
  Lisp_Object tortoise;
  intptr_t max, n;
  unsigned short int q;
};

/* Like FOR_EACH_TAIL (LIST), except evaluate CYCLE if a cycle is
   found, and check for quit if CHECK_QUIT.  This is an internal macro
   intended for use only by the above macros.

   Use Brent’s teleporting tortoise-hare algorithm.  See:
   Brent RP. BIT. 1980;20(2):176-184. doi:10.1007/BF01933190
   https://maths-people.anu.edu.au/~brent/pd/rpb051i.pdf

   This macro uses maybe_quit because of an excess of caution.  The
   call to maybe_quit should not be needed in practice, as a very long
   list, whether circular or not, will cause Emacs to be so slow in
   other uninterruptible areas (e.g., garbage collection) that there
   is little point to calling maybe_quit here.  */

#define FOR_EACH_TAIL_INTERNAL(tail, cycle, check_quit)			\
  for (struct for_each_tail_internal li = { tail, 2, 0, 2 };		\
       CONSP (tail);							\
       ((tail) = XCDR (tail),						\
	((--li.q != 0							\
	  || ((check_quit) ? maybe_quit () : (void) 0, 0 < --li.n)	\
	  || (li.q = li.n = li.max <<= 1, li.n >>= USHRT_WIDTH,		\
	      li.tortoise = (tail), false))				\
	 && BASE_EQ (tail, li.tortoise))				\
	? (cycle) : (void) 0))

/* Do a `for' loop over alist values.  */

#define FOR_EACH_ALIST_VALUE(head_var, list_var, value_var)		\
  for ((list_var) = (head_var);						\
       (CONSP (list_var) && ((value_var) = XCDR (XCAR (list_var)), true)); \
       (list_var) = XCDR (list_var))

/* Check whether it's time for GC, and run it if so.  */

INLINE void
maybe_gc (void)
{
  if (consing_until_gc < 0)
    maybe_garbage_collect ();
}

/* Simplified version of 'define-error' that works with pure
   objects.  */
void define_error (Lisp_Object name, const char *message, Lisp_Object parent);

# ifdef HAVE_MODULES

/* An `emacs_value' is just a pointer to a structure holding an
   internal Lisp object.  */
struct emacs_value_tag { Lisp_Object v; };

/* Pseudovector type for global references.  The pseudovector tag is
   PVEC_OTHER since these values are never printed and don't need to
   be special-cased for garbage collection.  */

struct module_global_reference {
  /* Pseudovector header, must come first. */
  struct vectorlike_header header;

  /* Holds the emacs_value for the object.  The Lisp_Object stored
     therein must be the same as the hash key.  */
  struct emacs_value_tag value;

  /* Reference count, always positive.  */
  ptrdiff_t refcount;
};

# endif /* HAVE_MODULES */

INLINE_HEADER_END

#endif /* EMACS_LISP_H */