XEmacs 21.2.28 "Hermes".

[chise/xemacs-chise.git.1] / src / gmalloc.c

/* Synched up with: Not synched up with FSF 19.28, even though I
   thought I did so. */

/* Get the configuration files if we're being compiled for Emacs.  */
#ifdef emacs
# include <config.h>
# include "getpagesize.h"
# ifndef HAVE_CONFIG_H
# define HAVE_CONFIG_H
# endif
#endif

#if defined (__STDC__) && !defined (STDC_HEADERS)
  /* The ANSI standard says that defining __STDC__ to a non-zero value means
     that the compiler conforms to that standard.  The standard requires
     certain header files and library functions to be present.  Therefore,
     if your compiler defines __STDC__ to non-0 but does not have ANSI headers
     and the ANSI library routines, then your compiler is buggy.  Conversely,
     an ANSI-conforming environment (which has both the ANSI headers and
     library routines, i.e., stdlib.h and `memmove') does not necessarily
     define the STDC_HEADERS flag.  Lucid Emacs requires an ANSI compiler.
     Therefore, there is no need to consult the abominable STDC_HEADERS flag.
     -- jwz
   */
# define STDC_HEADERS
#endif

#define __const const

\f
/* DO NOT EDIT THIS FILE -- it is automagically generated.  -*- C -*- */
/* Bwaa-haa-haa!  Not a chance that this is actually true! */

#define _MALLOC_INTERNAL

/* The malloc headers and source files from the C library follow here.  */

/* Declarations for `malloc' and friends.
   Copyright 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
                  Written May 1989 by Mike Haertel.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

   The author may be reached (Email) at the address mike@ai.mit.edu,
   or (US mail) as Mike Haertel c/o Free Software Foundation, Inc.  */

#ifndef _MALLOC_H

#define _MALLOC_H       1

#ifdef _MALLOC_INTERNAL

#ifdef  HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>
#include <limits.h>

#ifdef  HAVE_UNISTD_H
#include <unistd.h>
#endif

#endif  /* _MALLOC_INTERNAL.  */


#ifdef  __cplusplus
extern "C"
{
#endif

#undef  __P
#define __P(args)       args
#undef  __ptr_t
#define __ptr_t         void *

#include <stddef.h>
#define __malloc_size_t size_t

#ifndef NULL
#define NULL    0
#endif

/* XEmacs: I thought this should be int under SunOS, but that
   apparently fails.  Curses on all this shit. */
#define __free_ret_t void

/* XEmacs: I tried commenting these out and including stdlib.h,
   but that fails badly.  Urk!  This sucks. */
/* Allocate SIZE bytes of memory.  */
extern __ptr_t malloc __P ((size_t __size));
/* Re-allocate the previously allocated block
   in __ptr_t, making the new block SIZE bytes long.  */
extern __ptr_t realloc __P ((__ptr_t __ptr, size_t __size));
/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
extern __ptr_t calloc __P ((size_t __nmemb, size_t __size));
/* Free a block allocated by `malloc', `realloc' or `calloc'.  */
extern __free_ret_t free __P ((__ptr_t __ptr));

/* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
extern __ptr_t memalign __P ((size_t __alignment, size_t __size));

/* Allocate SIZE bytes on a page boundary.  */
extern __ptr_t valloc __P ((size_t __size));


#ifdef _MALLOC_INTERNAL

/* The allocator divides the heap into blocks of fixed size; large
   requests receive one or more whole blocks, and small requests
   receive a fragment of a block.  Fragment sizes are powers of two,
   and all fragments of a block are the same size.  When all the
   fragments in a block have been freed, the block itself is freed.  */
#define INT_BIT         (CHAR_BIT * sizeof(int))
#define BLOCKLOG        (INT_BIT > 16 ? 12 : 9)
#define BLOCKSIZE       (1 << BLOCKLOG)
#define BLOCKIFY(SIZE)  (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE)

/* Determine the amount of memory spanned by the initial heap table
   (not an absolute limit).  */
#define HEAP            (INT_BIT > 16 ? 4194304 : 65536)

/* Number of contiguous free blocks allowed to build up at the end of
   memory before they will be returned to the system.  */
#define FINAL_FREE_BLOCKS       8

/* Data structure giving per-block information.  */
typedef union
  {
    /* Heap information for a busy block.  */
    struct
      {
        /* Zero for a large block, or positive giving the
           logarithm to the base two of the fragment size.  */
        int type;
        union
          {
            struct
              {
                __malloc_size_t nfree; /* Free frags in a fragmented block.  */
                __malloc_size_t first; /* First free fragment of the block.  */
              } frag;
            /* Size (in blocks) of a large cluster.  */
            __malloc_size_t size;
          } info;
      } busy;
    /* Heap information for a free block
       (that may be the first of a free cluster).  */
    struct
      {
        __malloc_size_t size;   /* Size (in blocks) of a free cluster.  */
        __malloc_size_t next;   /* Index of next free cluster.  */
        __malloc_size_t prev;   /* Index of previous free cluster.  */
      } free;
  } malloc_info;

/* Pointer to first block of the heap.  */
extern char *_heapbase;

/* Table indexed by block number giving per-block information.  */
extern malloc_info *_heapinfo;

/* Address to block number and vice versa.  */
#define BLOCK(A)        (((char *) (A) - _heapbase) / BLOCKSIZE + 1)
#define ADDRESS(B)      ((__ptr_t) (((B) - 1) * BLOCKSIZE + _heapbase))

/* Current search index for the heap table.  */
extern __malloc_size_t _heapindex;

/* Limit of valid info table indices.  */
extern __malloc_size_t _heaplimit;

/* Doubly linked lists of free fragments.  */
struct list
{
  struct list *next;
  struct list *prev;
};

/* Free list headers for each fragment size.  */
extern struct list _fraghead[];

/* List of blocks allocated with `memalign' (or `valloc').  */
struct alignlist
{
  struct alignlist *next;
  __ptr_t aligned;              /* The address that memaligned returned.  */
  __ptr_t exact;                /* The address that malloc returned.  */
};
extern struct alignlist *_aligned_blocks;

/* Instrumentation.  */
extern __malloc_size_t _chunks_used;
extern __malloc_size_t _bytes_used;
extern __malloc_size_t _chunks_free;
extern __malloc_size_t _bytes_free;

/* Internal version of `free' used in `morecore' (malloc.c). */
extern void _free_internal __P ((__ptr_t __ptr));

#endif /* _MALLOC_INTERNAL.  */

/* Underlying allocation function; successive calls should
   return contiguous pieces of memory.  */
extern __ptr_t (*__morecore) __P ((ptrdiff_t __size));

/* Default value of `__morecore'.  */
extern __ptr_t __default_morecore __P ((ptrdiff_t __size));

/* If not NULL, this function is called after each time
   `__morecore' is called to increase the data size.  */
extern void (*__after_morecore_hook) __P ((void));

/* Nonzero if `malloc' has been called and done its initialization.  */
    /* extern int __malloc_initialized; */

/* Hooks for debugging versions.  */
extern void (*__free_hook) __P ((__ptr_t __ptr));
extern __ptr_t (*__malloc_hook) __P ((size_t __size));
extern __ptr_t (*__realloc_hook) __P ((__ptr_t __ptr, size_t __size));

/* Return values for `mprobe': these are the kinds of inconsistencies that
   `mcheck' enables detection of.  */
enum mcheck_status
{
  MCHECK_DISABLED = -1,         /* Consistency checking is not turned on.  */
  MCHECK_OK,                    /* Block is fine.  */
  MCHECK_FREE,                  /* Block freed twice.  */
  MCHECK_HEAD,                  /* Memory before the block was clobbered.  */
  MCHECK_TAIL                   /* Memory after the block was clobbered.  */
};

/* Activate a standard collection of debugging hooks.  This must be called
   before `malloc' is ever called.  ABORTFUNC is called with an error code
   (see enum above) when an inconsistency is detected.  If ABORTFUNC is
   null, the standard function prints on stderr and then calls `abort'.  */
extern int mcheck __P ((void (*__abortfunc) __P ((enum mcheck_status))));

/* Check for aberrations in a particular malloc'd block.  You must have
   called `mcheck' already.  These are the same checks that `mcheck' does
   when you free or reallocate a block.  */
extern enum mcheck_status mprobe __P ((__ptr_t __ptr));

/* Activate a standard collection of tracing hooks.  */
extern void mtrace __P ((void));
extern void muntrace __P ((void));

/* Statistics available to the user.  */
struct mstats
{
  __malloc_size_t bytes_total;  /* Total size of the heap. */
  __malloc_size_t chunks_used;  /* Chunks allocated by the user. */
  __malloc_size_t bytes_used;   /* Byte total of user-allocated chunks. */
  __malloc_size_t chunks_free;  /* Chunks in the free list. */
  __malloc_size_t bytes_free;   /* Byte total of chunks in the free list. */
};

/* Pick up the current statistics. */
extern struct mstats mstats __P ((void));

/* Call WARNFUN with a warning message when memory usage is high.  */
extern void memory_warnings __P ((__ptr_t __start,
                                  void (*__warnfun) __P ((__const char *))));


#if 0 /* unused in this file, and conflicting prototypes anyway */
/* Relocating allocator.  */

/* Allocate SIZE bytes, and store the address in *HANDLEPTR.  */
extern __ptr_t r_alloc __P ((__ptr_t *__handleptr, size_t __size));

/* Free the storage allocated in HANDLEPTR.  */
extern void r_alloc_free __P ((__ptr_t *__handleptr));

/* Adjust the block at HANDLEPTR to be SIZE bytes long.  */
extern __ptr_t r_re_alloc __P ((__ptr_t *__handleptr, size_t __size));
#endif /* 0 */

#ifdef  __cplusplus
}
#endif

#endif /* malloc.h  */
/* Allocate memory on a page boundary.
   Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

   The author may be reached (Email) at the address mike@ai.mit.edu,
   or (US mail) as Mike Haertel c/o Free Software Foundation, Inc.  */

#if defined (__GNU_LIBRARY__) || defined (_LIBC)
#include <stddef.h>
#include <sys/cdefs.h>
#if ! (defined (__GLIBC__) && (__GLIBC__ >= 2))
extern size_t __getpagesize __P ((void));
#endif
#else
#include "getpagesize.h"
#define  __getpagesize()        getpagesize()
#endif

#ifndef _MALLOC_INTERNAL
#define _MALLOC_INTERNAL
#include <malloc.h>
#endif

static __malloc_size_t pagesize;

__ptr_t
valloc (__malloc_size_t size)
{
  if (pagesize == 0)
    pagesize = __getpagesize ();

  return memalign (pagesize, size);
}
/* Memory allocator `malloc'.
   Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation
                  Written May 1989 by Mike Haertel.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

   The author may be reached (Email) at the address mike@ai.mit.edu,
   or (US mail) as Mike Haertel c/o Free Software Foundation, Inc.  */

#ifndef _MALLOC_INTERNAL
#define _MALLOC_INTERNAL
#include <malloc.h>
#endif

/* How to really get more memory.  */
#ifdef HEAP_IN_DATA
/* once dumped, free() & realloc() on static heap space will fail */
#define PURE_DATA(x) \
((static_heap_dumped && (char*)x >= static_heap_base \
  && (char*)x <= (static_heap_base + static_heap_size) ) ? 1 : 0)
extern int initialized;
extern int purify_flag;
extern char* static_heap_base;
extern char* static_heap_ptr;
extern char* static_heap_dumped;
extern unsigned long static_heap_size;
extern __ptr_t more_static_core __P ((ptrdiff_t __size));
__ptr_t (*__morecore) __P ((ptrdiff_t __size)) = more_static_core;
#else
__ptr_t (*__morecore) __P ((ptrdiff_t __size)) = __default_morecore;
#define PURE_DATA(x) 0
#endif

/* Debugging hook for `malloc'.  */
__ptr_t (*__malloc_hook) __P ((__malloc_size_t __size));

/* Pointer to the base of the first block.  */
char *_heapbase;

/* Block information table.  Allocated with align/__free (not malloc/free).  */
malloc_info *_heapinfo;

/* Number of info entries.  */
static __malloc_size_t heapsize;

/* Search index in the info table.  */
__malloc_size_t _heapindex;

/* Limit of valid info table indices.  */
__malloc_size_t _heaplimit;

/* Free lists for each fragment size.  */
struct list _fraghead[BLOCKLOG];

/* Instrumentation.  */
__malloc_size_t _chunks_used;
__malloc_size_t _bytes_used;
__malloc_size_t _chunks_free;
__malloc_size_t _bytes_free;

/* Are you experienced?  */
int __malloc_initialized;

void (*__after_morecore_hook) __P ((void));

/* Aligned allocation.  */
static __ptr_t align __P ((__malloc_size_t));
static __ptr_t
align (__malloc_size_t size)
{
  __ptr_t result;
  unsigned long int adj;

  result = (*__morecore) (size);
  adj = (unsigned long int) ((unsigned long int) ((char *) result -
                                                  (char *) NULL)) % BLOCKSIZE;
  if (adj != 0)
    {
      adj = BLOCKSIZE - adj;
      (void) (*__morecore) (adj);
      result = (char *) result + adj;
    }

  if (__after_morecore_hook)
    (*__after_morecore_hook) ();

  return result;
}

/* Set everything up and remember that we have.  */
static int initialize __P ((void));
static int
initialize ()
{
#ifdef HEAP_IN_DATA
  if (static_heap_dumped && __morecore == more_static_core)
    {
      __morecore = __default_morecore;
    }
#endif
  heapsize = HEAP / BLOCKSIZE;
  _heapinfo = (malloc_info *) align (heapsize * sizeof (malloc_info));
  if (_heapinfo == NULL)
    return 0;
  memset (_heapinfo, 0, heapsize * sizeof (malloc_info));
  memset (_fraghead, 0, BLOCKLOG * sizeof (struct list));
  _heapinfo[0].free.size = 0;
  _heapinfo[0].free.next = _heapinfo[0].free.prev = 0;
  _heapindex = 0;
  _heaplimit = 0;
  _heapbase = (char *) _heapinfo;

  /* Account for the _heapinfo block itself in the statistics.  */
  _bytes_used = heapsize * sizeof (malloc_info);
  _chunks_used = 1;
  _chunks_free=0;
  _bytes_free=0;
  _aligned_blocks=0;

  __malloc_initialized = 1;
  return 1;
}

/* Get neatly aligned memory, initializing or
   growing the heap info table as necessary. */
static __ptr_t morecore __P ((__malloc_size_t));
static __ptr_t
morecore (__malloc_size_t size)
{
  __ptr_t result;
  malloc_info *newinfo, *oldinfo;
  __malloc_size_t newsize;

  result = align (size);
  if (result == NULL)
    return NULL;

  /* Check if we need to grow the info table.  */
  if ((__malloc_size_t) BLOCK ((char *) result + size) > heapsize)
    {
      newsize = heapsize;
      while ((__malloc_size_t) BLOCK ((char *) result + size) > newsize)
        newsize *= 2;
      newinfo = (malloc_info *) align (newsize * sizeof (malloc_info));
      if (newinfo == NULL)
        {
          (*__morecore) (-(int)size);
          return NULL;
        }
      memcpy (newinfo, _heapinfo, heapsize * sizeof (malloc_info));
      memset (&newinfo[heapsize], 0,
              (newsize - heapsize) * sizeof (malloc_info));
      oldinfo = _heapinfo;
      newinfo[BLOCK (oldinfo)].busy.type = 0;
      newinfo[BLOCK (oldinfo)].busy.info.size
        = BLOCKIFY (heapsize * sizeof (malloc_info));
      _heapinfo = newinfo;
      /* Account for the _heapinfo block itself in the statistics.  */
      _bytes_used += newsize * sizeof (malloc_info);
      ++_chunks_used;
      _free_internal (oldinfo);
      heapsize = newsize;
    }

  _heaplimit = BLOCK ((char *) result + size);
  return result;
}

/* Allocate memory from the heap.  */
__ptr_t
malloc (__malloc_size_t size)
{
  __ptr_t result;
  __malloc_size_t block, blocks, lastblocks, start;
  __malloc_size_t i;
  struct list *next;

  /* ANSI C allows `malloc (0)' to either return NULL, or to return a
     valid address you can realloc and free (though not dereference).

     It turns out that some extant code (sunrpc, at least Ultrix's version)
     expects `malloc (0)' to return non-NULL and breaks otherwise.
     Be compatible.  */

#ifdef HAVE_X_WINDOWS
  /* there is at least one Xt bug where calloc(n,x) is blindly called
     where n can be 0, and yet if 0 is returned, Xt barfs */
  if (size == 0)
    size = sizeof (struct list);
#else
  if (size == 0)
    return NULL;
#endif

  if (__malloc_hook != NULL)
    return (*__malloc_hook) (size);

  if (!__malloc_initialized)
    if (!initialize ())
      return NULL;

#ifdef SUNOS_LOCALTIME_BUG
  /* Workaround for localtime() allocating 8 bytes and writing 9 bug... */
  if (size < 16)
    size = 16;
#endif

  if (size < sizeof (struct list))
      size = sizeof (struct list);

  /* Determine the allocation policy based on the request size.  */
  if (size <= BLOCKSIZE / 2)
    {
      /* Small allocation to receive a fragment of a block.
         Determine the logarithm to base two of the fragment size. */
      __malloc_size_t log = 1;
      --size;
      while ((size /= 2) != 0)
        ++log;

      /* Look in the fragment lists for a
         free fragment of the desired size. */
      next = _fraghead[log].next;
      if (next != NULL)
        {
          /* There are free fragments of this size.
             Pop a fragment out of the fragment list and return it.
             Update the block's nfree and first counters. */
          result = (__ptr_t) next;
          next->prev->next = next->next;
          if (next->next != NULL)
            next->next->prev = next->prev;
          block = BLOCK (result);
          if (--_heapinfo[block].busy.info.frag.nfree != 0)
            _heapinfo[block].busy.info.frag.first = (unsigned long int)
              ((unsigned long int) ((char *) next->next - (char *) NULL)
               % BLOCKSIZE) >> log;

          /* Update the statistics.  */
          ++_chunks_used;
          _bytes_used += 1 << log;
          --_chunks_free;
          _bytes_free -= 1 << log;
        }
      else
        {
          /* No free fragments of the desired size, so get a new block
             and break it into fragments, returning the first.  */
          result = malloc (BLOCKSIZE);
          if (result == NULL)
            return NULL;

          /* Link all fragments but the first into the free list.  */
          for (i = 1; i < (__malloc_size_t) (BLOCKSIZE >> log); ++i)
            {
              next = (struct list *) ((char *) result + (i << log));
              next->next = _fraghead[log].next;
              next->prev = &_fraghead[log];
              next->prev->next = next;
              if (next->next != NULL)
                next->next->prev = next;
            }

          /* Initialize the nfree and first counters for this block.  */
          block = BLOCK (result);
          _heapinfo[block].busy.type = log;
          _heapinfo[block].busy.info.frag.nfree = i - 1;
          _heapinfo[block].busy.info.frag.first = i - 1;

          _chunks_free += (BLOCKSIZE >> log) - 1;
          _bytes_free += BLOCKSIZE - (1 << log);
          _bytes_used -= BLOCKSIZE - (1 << log);
        }
    }
  else
    {
      /* Large allocation to receive one or more blocks.
         Search the free list in a circle starting at the last place visited.
         If we loop completely around without finding a large enough
         space we will have to get more memory from the system.  */
      blocks = BLOCKIFY (size);
      start = block = _heapindex;
      while (_heapinfo[block].free.size < blocks)
        {
          block = _heapinfo[block].free.next;
          if (block == start)
            {
              /* Need to get more from the system.  Check to see if
                 the new core will be contiguous with the final free
                 block; if so we don't need to get as much.  */
              block = _heapinfo[0].free.prev;
              lastblocks = _heapinfo[block].free.size;
              if (_heaplimit != 0 && block + lastblocks == _heaplimit &&
                  (*__morecore) (0) == ADDRESS (block + lastblocks) &&
                  (morecore ((blocks - lastblocks) * BLOCKSIZE)) != NULL)
                {
                  /* Which block we are extending (the `final free
                     block' referred to above) might have changed, if
                     it got combined with a freed info table.  */
                  block = _heapinfo[0].free.prev;
                  _heapinfo[block].free.size += (blocks - lastblocks);
                  _bytes_free += (blocks - lastblocks) * BLOCKSIZE;
                  continue;
                }
              result = morecore (blocks * BLOCKSIZE);
              if (result == NULL)
                return NULL;
              block = BLOCK (result);
              _heapinfo[block].busy.type = 0;
              _heapinfo[block].busy.info.size = blocks;
              ++_chunks_used;
              _bytes_used += blocks * BLOCKSIZE;
              return result;
            }
        }

      /* At this point we have found a suitable free list entry.
         Figure out how to remove what we need from the list. */
      result = ADDRESS (block);
      if (_heapinfo[block].free.size > blocks)
        {
          /* The block we found has a bit left over,
             so relink the tail end back into the free list. */
          _heapinfo[block + blocks].free.size
            = _heapinfo[block].free.size - blocks;
          _heapinfo[block + blocks].free.next
            = _heapinfo[block].free.next;
          _heapinfo[block + blocks].free.prev
            = _heapinfo[block].free.prev;
          _heapinfo[_heapinfo[block].free.prev].free.next
            = _heapinfo[_heapinfo[block].free.next].free.prev
            = _heapindex = block + blocks;
        }
      else
        {
          /* The block exactly matches our requirements,
             so just remove it from the list. */
          _heapinfo[_heapinfo[block].free.next].free.prev
            = _heapinfo[block].free.prev;
          _heapinfo[_heapinfo[block].free.prev].free.next
            = _heapindex = _heapinfo[block].free.next;
          --_chunks_free;
        }

      _heapinfo[block].busy.type = 0;
      _heapinfo[block].busy.info.size = blocks;
      ++_chunks_used;
      _bytes_used += blocks * BLOCKSIZE;
      _bytes_free -= blocks * BLOCKSIZE;
    }

  return result;
}
\f
#ifndef _LIBC

/* On some ANSI C systems, some libc functions call _malloc, _free
   and _realloc.  Make them use the GNU functions.  */

__ptr_t _malloc (__malloc_size_t size);
__ptr_t
_malloc (__malloc_size_t size)
{
  return malloc (size);
}

void _free (__ptr_t ptr);
void
_free (__ptr_t ptr)
{
  free (ptr);
}

__ptr_t _realloc (__ptr_t ptr, __malloc_size_t size);
__ptr_t
_realloc (__ptr_t ptr, __malloc_size_t size)
{
  return realloc (ptr, size);
}

#endif
/* Free a block of memory allocated by `malloc'.
   Copyright 1990, 1991, 1992, 1994 Free Software Foundation
                  Written May 1989 by Mike Haertel.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

   The author may be reached (Email) at the address mike@ai.mit.edu,
   or (US mail) as Mike Haertel c/o Free Software Foundation, Inc.  */

#ifndef _MALLOC_INTERNAL
#define _MALLOC_INTERNAL
#include <malloc.h>
#endif

/* Debugging hook for free.  */
void (*__free_hook) __P ((__ptr_t __ptr));

/* List of blocks allocated by memalign.  */
struct alignlist *_aligned_blocks = NULL;

/* Return memory to the heap.
   Like `free' but don't call a __free_hook if there is one.  */
void
_free_internal (__ptr_t ptr)
{
  int type;
  __malloc_size_t block, blocks;
  __malloc_size_t i;
  struct list *prev, *next;

  block = BLOCK (ptr);

  type = _heapinfo[block].busy.type;
  switch (type)
    {
    case 0:
      /* Get as many statistics as early as we can.  */
      --_chunks_used;
      _bytes_used -= _heapinfo[block].busy.info.size * BLOCKSIZE;
      _bytes_free += _heapinfo[block].busy.info.size * BLOCKSIZE;

      /* Find the free cluster previous to this one in the free list.
         Start searching at the last block referenced; this may benefit
         programs with locality of allocation.  */
      i = _heapindex;
      if (i > block)
        while (i > block)
          i = _heapinfo[i].free.prev;
      else
        {
          do
            i = _heapinfo[i].free.next;
          while (i > 0 && i < block);
          i = _heapinfo[i].free.prev;
        }

      /* Determine how to link this block into the free list.  */
      if (block == i + _heapinfo[i].free.size)
        {
          /* Coalesce this block with its predecessor.  */
          _heapinfo[i].free.size += _heapinfo[block].busy.info.size;
          block = i;
        }
      else
        {
          /* Really link this block back into the free list.  */
          _heapinfo[block].free.size = _heapinfo[block].busy.info.size;
          _heapinfo[block].free.next = _heapinfo[i].free.next;
          _heapinfo[block].free.prev = i;
          _heapinfo[i].free.next = block;
          _heapinfo[_heapinfo[block].free.next].free.prev = block;
          ++_chunks_free;
        }

      /* Now that the block is linked in, see if we can coalesce it
         with its successor (by deleting its successor from the list
         and adding in its size).  */
      if (block + _heapinfo[block].free.size == _heapinfo[block].free.next)
        {
          _heapinfo[block].free.size
            += _heapinfo[_heapinfo[block].free.next].free.size;
          _heapinfo[block].free.next
            = _heapinfo[_heapinfo[block].free.next].free.next;
          _heapinfo[_heapinfo[block].free.next].free.prev = block;
          --_chunks_free;
        }

      /* Now see if we can return stuff to the system.  */
      blocks = _heapinfo[block].free.size;
      if (blocks >= FINAL_FREE_BLOCKS && block + blocks == _heaplimit
          && (*__morecore) (0) == ADDRESS (block + blocks))
        {
          __malloc_size_t bytes = blocks * BLOCKSIZE;
          _heaplimit -= blocks;
          (*__morecore) (-(int)bytes);
          _heapinfo[_heapinfo[block].free.prev].free.next
            = _heapinfo[block].free.next;
          _heapinfo[_heapinfo[block].free.next].free.prev
            = _heapinfo[block].free.prev;
          block = _heapinfo[block].free.prev;
          --_chunks_free;
          _bytes_free -= bytes;
        }

      /* Set the next search to begin at this block.  */
      _heapindex = block;
      break;

    default:
      /* Do some of the statistics.  */
      --_chunks_used;
      _bytes_used -= 1 << type;
      ++_chunks_free;
      _bytes_free += 1 << type;

      /* Get the address of the first free fragment in this block.  */
      prev = (struct list *) ((char *) ADDRESS (block) +
                           (_heapinfo[block].busy.info.frag.first << type));

      if (_heapinfo[block].busy.info.frag.nfree == (BLOCKSIZE >> type) - 1)
        {
          /* If all fragments of this block are free, remove them
             from the fragment list and free the whole block.  */
          next = prev;
          for (i = 1; i < (__malloc_size_t) (BLOCKSIZE >> type); ++i)
            next = next->next;
          prev->prev->next = next;
          if (next != NULL)
            next->prev = prev->prev;
          _heapinfo[block].busy.type = 0;
          _heapinfo[block].busy.info.size = 1;

          /* Keep the statistics accurate.  */
          ++_chunks_used;
          _bytes_used += BLOCKSIZE;
          _chunks_free -= BLOCKSIZE >> type;
          _bytes_free -= BLOCKSIZE;

          free (ADDRESS (block));
        }
      else if (_heapinfo[block].busy.info.frag.nfree != 0)
        {
          /* If some fragments of this block are free, link this
             fragment into the fragment list after the first free
             fragment of this block. */
          next = (struct list *) ptr;
          next->next = prev->next;
          next->prev = prev;
          prev->next = next;
          if (next->next != NULL)
            next->next->prev = next;
          ++_heapinfo[block].busy.info.frag.nfree;
        }
      else
        {
          /* No fragments of this block are free, so link this
             fragment into the fragment list and announce that
             it is the first free fragment of this block. */
          prev = (struct list *) ptr;
          _heapinfo[block].busy.info.frag.nfree = 1;
          _heapinfo[block].busy.info.frag.first = (unsigned long int)
            ((unsigned long int) ((char *) ptr - (char *) NULL)
             % BLOCKSIZE >> type);
          prev->next = _fraghead[type].next;
          prev->prev = &_fraghead[type];
          prev->prev->next = prev;
          if (prev->next != NULL)
            prev->next->prev = prev;
        }
      break;
    }
}

/* Return memory to the heap.  */
__free_ret_t
free (__ptr_t ptr)
{
  struct alignlist *l;

  if (ptr == NULL)
    return;

  if (PURE_DATA(ptr))
    {
      return;
    }

  for (l = _aligned_blocks; l != NULL; l = l->next)
    if (l->aligned == ptr)
      {
        l->aligned = NULL;      /* Mark the slot in the list as free.  */
        ptr = l->exact;
        break;
      }

  if (__free_hook != NULL)
    (*__free_hook) (ptr);
  else
    _free_internal (ptr);
}
/* Copyright (C) 1991, 1993, 1994 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library 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
Library General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */

#ifndef _MALLOC_INTERNAL
#define _MALLOC_INTERNAL
#include <malloc.h>
#endif

#ifdef _LIBC

#include <ansidecl.h>
#include <gnu-stabs.h>

#undef  cfree

function_alias(cfree, free, void, (ptr),
               DEFUN(cfree, (ptr), PTR ptr))

#else

void cfree (__ptr_t ptr);
void
cfree (__ptr_t ptr)
{
  free (ptr);
}

#endif
/* Change the size of a block allocated by `malloc'.
   Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
                     Written May 1989 by Mike Haertel.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

   The author may be reached (Email) at the address mike@ai.mit.edu,
   or (US mail) as Mike Haertel c/o Free Software Foundation, Inc.  */

#ifndef _MALLOC_INTERNAL
#define _MALLOC_INTERNAL
#include <malloc.h>
#endif

#ifndef min
#define min(A, B) ((A) < (B) ? (A) : (B))
#endif

/* Debugging hook for realloc.  */
__ptr_t (*__realloc_hook) __P ((__ptr_t __ptr, __malloc_size_t __size));

/* Resize the given region to the new size, returning a pointer
   to the (possibly moved) region.  This is optimized for speed;
   some benchmarks seem to indicate that greater compactness is
   achieved by unconditionally allocating and copying to a
   new region.  This module has incestuous knowledge of the
   internals of both free and malloc. */
__ptr_t
realloc (__ptr_t ptr, __malloc_size_t size)
{
  __ptr_t result;
  int type;
  __malloc_size_t block, blocks, oldlimit;

  if (PURE_DATA(ptr))
    {
      result = malloc (size);
      memcpy(result, ptr, size);
      return result;
    }
  
  else if (size == 0)
    {
      free (ptr);
      return malloc (0);
    }
  else if (ptr == NULL)
    return malloc (size);

  if (__realloc_hook != NULL)
    return (*__realloc_hook) (ptr, size);

  block = BLOCK (ptr);

  type = _heapinfo[block].busy.type;
  switch (type)
    {
    case 0:
      /* Maybe reallocate a large block to a small fragment.  */
      if (size <= BLOCKSIZE / 2)
        {
          result = malloc (size);
          if (result != NULL)
            {
              memcpy (result, ptr, size);
              _free_internal (ptr);
              return result;
            }
        }

      /* The new size is a large allocation as well;
         see if we can hold it in place. */
      blocks = BLOCKIFY (size);
      if (blocks < _heapinfo[block].busy.info.size)
        {
          /* The new size is smaller; return
             excess memory to the free list. */
          _heapinfo[block + blocks].busy.type = 0;
          _heapinfo[block + blocks].busy.info.size
            = _heapinfo[block].busy.info.size - blocks;
          _heapinfo[block].busy.info.size = blocks;
          /* We have just created a new chunk by splitting a chunk in two.
             Now we will free this chunk; increment the statistics counter
             so it doesn't become wrong when _free_internal decrements it.  */
          ++_chunks_used;
          _free_internal (ADDRESS (block + blocks));
          result = ptr;
        }
      else if (blocks == _heapinfo[block].busy.info.size)
        /* No size change necessary.  */
        result = ptr;
      else
        {
          /* Won't fit, so allocate a new region that will.
             Free the old region first in case there is sufficient
             adjacent free space to grow without moving. */
          blocks = _heapinfo[block].busy.info.size;
          /* Prevent free from actually returning memory to the system.  */
          oldlimit = _heaplimit;
          _heaplimit = 0;
          free (ptr);
          _heaplimit = oldlimit;
          result = malloc (size);
          if (result == NULL)
            {
              /* Now we're really in trouble.  We have to unfree
                 the thing we just freed.  Unfortunately it might
                 have been coalesced with its neighbors.  */
              if (_heapindex == block)
                (void) malloc (blocks * BLOCKSIZE);
              else
                {
                  __ptr_t previous = malloc ((block - _heapindex) * BLOCKSIZE);
                  (void) malloc (blocks * BLOCKSIZE);
                  free (previous);
                }
              return NULL;
            }
          if (ptr != result)
            memmove (result, ptr, blocks * BLOCKSIZE);
        }
      break;

    default:
      /* Old size is a fragment; type is logarithm
         to base two of the fragment size.  */
      if (size > (__malloc_size_t) (1 << (type - 1)) &&
          size <= (__malloc_size_t) (1 << type))
        /* The new size is the same kind of fragment.  */
        result = ptr;
      else
        {
          /* The new size is different; allocate a new space,
             and copy the lesser of the new size and the old. */
          result = malloc (size);
          if (result == NULL)
            return NULL;
          memcpy (result, ptr, min (size, (__malloc_size_t) 1 << type));
          free (ptr);
        }
      break;
    }

  return result;
}
/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

   The author may be reached (Email) at the address mike@ai.mit.edu,
   or (US mail) as Mike Haertel c/o Free Software Foundation, Inc.  */

#ifndef _MALLOC_INTERNAL
#define _MALLOC_INTERNAL
#include <malloc.h>
#endif

/* Allocate an array of NMEMB elements each SIZE bytes long.
   The entire array is initialized to zeros.  */
__ptr_t
calloc (__malloc_size_t nmemb, __malloc_size_t size)
{
  __ptr_t result = malloc (nmemb * size);

  if (result != NULL)
    (void) memset (result, 0, nmemb * size);

  return result;
}
/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library 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 2, or (at your option)
any later version.

The GNU C Library 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 the GNU C Library; see the file COPYING.  If not, write to
the Free the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifndef _MALLOC_INTERNAL
#define _MALLOC_INTERNAL
#include <malloc.h>
#endif

/* #ifndef      __GNU_LIBRARY__ */
#define __sbrk  sbrk
/* #endif */

#ifdef GMALLOC_NEEDS_SBRK_DECL
/* some versions of OSF1 need this */
extern __ptr_t __sbrk __P ((ssize_t increment));
#else
#ifdef __GNU_LIBRARY__
/* It is best not to declare this and cast its result on foreign operating
   systems with potentially hostile include files.  */
#if !(defined(linux) && defined(sparc))
extern __ptr_t __sbrk __P ((int increment));
#endif
#endif
#endif

#ifndef NULL
#define NULL 0
#endif

/* Allocate INCREMENT more bytes of data space,
   and return the start of data space, or NULL on errors.
   If INCREMENT is negative, shrink data space.  */
__ptr_t
__default_morecore (
#ifdef __STDC__
     ptrdiff_t increment
#else
#ifdef OSF1
     long increment
#else
     int increment
#endif
#endif
     )
{
#ifdef OSF1
  __ptr_t result = (__ptr_t) __sbrk ((ssize_t) increment);
#else
  __ptr_t result = (__ptr_t) __sbrk ((int) increment);
#endif
  if (result == (__ptr_t) -1)
    return NULL;
  return result;
}
/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */

#ifndef _MALLOC_INTERNAL
#define _MALLOC_INTERNAL
#include <malloc.h>
#endif

__ptr_t
memalign (__malloc_size_t alignment, __malloc_size_t size)
{
  __ptr_t result;
  unsigned long int adj;

  size = ((size + alignment - 1) / alignment) * alignment;

  result = malloc (size);
  if (result == NULL)
    return NULL;
  adj = (unsigned long int) ((unsigned long int) ((char *) result -
                                                  (char *) NULL)) % alignment;
  if (adj != 0)
    {
      struct alignlist *l;
      for (l = _aligned_blocks; l != NULL; l = l->next)
        if (l->aligned == NULL)
          /* This slot is free.  Use it.  */
          break;
      if (l == NULL)
        {
          l = (struct alignlist *) malloc (sizeof (struct alignlist));
          if (l == NULL)
            {
              free (result);
              return NULL;
            }
          l->next = _aligned_blocks;
          _aligned_blocks = l;
        }
      l->exact = result;
      result = l->aligned = (char *) result + alignment - adj;
    }

  return result;
}