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/* obstack.c - subroutines used implicitly by object stack macros

   Copyright (C) 1988,89,90,91,92,93,94,96,97 Free Software Foundation, Inc.

   NOTE: This source is derived from an old version taken from the GNU C

   Library (glibc).

   This program 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.

   This program 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 this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,

   USA.  */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include "obstack.h"

/* NOTE BEFORE MODIFYING THIS FILE: This version number must be

   incremented whenever callers compiled using an old obstack.h can no

   longer properly call the functions in this obstack.c.  */

#define OBSTACK_INTERFACE_VERSION 1

/* Comment out all this code if we are using the GNU C Library, and are not

   actually compiling the library itself, and the installed library

   supports the same library interface we do.  This code is part of the GNU

   C Library, but also included in many other GNU distributions.  Compiling

   and linking in this code is a waste when using the GNU C library

   (especially if it is a shared library).  Rather than having every GNU

   program understand `configure --with-gnu-libc' and omit the object

   files, it is simpler to just do this in the source for each such file.  */

#include <stdio.h>              /* Random thing to get __GNU_LIBRARY__.  */

#if !defined (_LIBC) && defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1

#include <gnu-versions.h>

#if _GNU_OBSTACK_INTERFACE_VERSION == OBSTACK_INTERFACE_VERSION

#define ELIDE_CODE

#endif

#endif

#ifndef ELIDE_CODE

#define POINTER void *

/* Determine default alignment.  */

struct fooalign {char x; double d;};

#define DEFAULT_ALIGNMENT  \

  ((PTR_INT_TYPE) ((char *) &((struct fooalign *) 0)->d - (char *) 0))

/* If malloc were really smart, it would round addresses to DEFAULT_ALIGNMENT.

   But in fact it might be less smart and round addresses to as much as

   DEFAULT_ROUNDING.  So we prepare for it to do that.  */

union fooround {long x; double d;};

#define DEFAULT_ROUNDING (sizeof (union fooround))

/* When we copy a long block of data, this is the unit to do it with.

   On some machines, copying successive ints does not work;

   in such a case, redefine COPYING_UNIT to `long' (if that works)

   or `char' as a last resort.  */

#ifndef COPYING_UNIT

#define COPYING_UNIT int

#endif

/* The functions allocating more room by calling `obstack_chunk_alloc'

   jump to the handler pointed to by `obstack_alloc_failed_handler'.

   This variable by default points to the internal function

   `print_and_abort'.  */

static void print_and_abort (void);

void (*obstack_alloc_failed_handler) (void) = print_and_abort;

/* Exit value used when `print_and_abort' is used.  */

#if defined __GNU_LIBRARY__ || defined HAVE_STDLIB_H

#include <stdlib.h>

#endif

#ifndef EXIT_FAILURE

#define EXIT_FAILURE 1

#endif

int obstack_exit_failure = EXIT_FAILURE;

/* The non-GNU-C macros copy the obstack into this global variable

   to avoid multiple evaluation.  */

struct obstack *_obstack;

/* Define a macro that either calls functions with the traditional malloc/free

   calling interface, or calls functions with the mmalloc/mfree interface

   (that adds an extra first argument), based on the state of use_extra_arg.

   For free, do not use ?:, since some compilers, like the MIPS compilers,

   do not allow (expr) ? void : void.  */

#if defined (__STDC__) && __STDC__

#define CALL_CHUNKFUN(h, size) \

  (((h) -> use_extra_arg) \

   ? (*(h)->chunkfun) ((h)->extra_arg, (size)) \

   : (*(struct _obstack_chunk *(*) (long)) (h)->chunkfun) ((size)))

#define CALL_FREEFUN(h, old_chunk) \

  do { \

    if ((h) -> use_extra_arg) \

      (*(h)->freefun) ((h)->extra_arg, (old_chunk)); \

    else \

      (*(void (*) (void *)) (h)->freefun) ((old_chunk)); \

  } while (0)

#else

#define CALL_CHUNKFUN(h, size) \

  (((h) -> use_extra_arg) \

   ? (*(h)->chunkfun) ((h)->extra_arg, (size)) \

   : (*(struct _obstack_chunk *(*) ()) (h)->chunkfun) ((size)))

#define CALL_FREEFUN(h, old_chunk) \

  do { \

    if ((h) -> use_extra_arg) \

      (*(h)->freefun) ((h)->extra_arg, (old_chunk)); \

    else \

      (*(void (*) ()) (h)->freefun) ((old_chunk)); \

  } while (0)

#endif

/* Initialize an obstack H for use.  Specify chunk size SIZE (0 means default).

   Objects start on multiples of ALIGNMENT (0 means use default).

   CHUNKFUN is the function to use to allocate chunks,

   and FREEFUN the function to free them.

   Return nonzero if successful, zero if out of memory.

   To recover from an out of memory error,

   free up some memory, then call this again.  */

int

_obstack_begin (struct obstack *h, int size, int alignment,

                POINTER (*chunkfun) (long), void (*freefun) (void *))

{

  register struct _obstack_chunk *chunk; /* points to new chunk */

  if (alignment == 0)

    alignment = (int) DEFAULT_ALIGNMENT;

  if (size == 0)

    /* Default size is what GNU malloc can fit in a 4096-byte block.  */

    {

      /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.

         Use the values for range checking, because if range checking is off,

         the extra bytes won't be missed terribly, but if range checking is on

         and we used a larger request, a whole extra 4096 bytes would be

         allocated.

         These number are irrelevant to the new GNU malloc.  I suspect it is

         less sensitive to the size of the request.  */

      int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))

                    + 4 + DEFAULT_ROUNDING - 1)

                   & ~(DEFAULT_ROUNDING - 1));

      size = 4096 - extra;

    }

  h->chunkfun = (struct _obstack_chunk * (*)(void *, long)) chunkfun;

  h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;

  h->chunk_size = size;

  h->alignment_mask = alignment - 1;

  h->use_extra_arg = 0;

  chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);

  if (!chunk)

    (*obstack_alloc_failed_handler) ();

  h->next_free = h->object_base = chunk->contents;

  h->chunk_limit = chunk->limit

    = (char *) chunk + h->chunk_size;

  chunk->prev = 0;

  /* The initial chunk now contains no empty object.  */

  h->maybe_empty_object = 0;

  h->alloc_failed = 0;

  return 1;

}

int

_obstack_begin_1 (struct obstack *h, int size, int alignment,

                  POINTER (*chunkfun) (POINTER, long),

                  void (*freefun) (POINTER, POINTER), POINTER arg)

{

  register struct _obstack_chunk *chunk; /* points to new chunk */

  if (alignment == 0)

    alignment = (int) DEFAULT_ALIGNMENT;

  if (size == 0)

    /* Default size is what GNU malloc can fit in a 4096-byte block.  */

    {

      /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.

         Use the values for range checking, because if range checking is off,

         the extra bytes won't be missed terribly, but if range checking is on

         and we used a larger request, a whole extra 4096 bytes would be

         allocated.

         These number are irrelevant to the new GNU malloc.  I suspect it is

         less sensitive to the size of the request.  */

      int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))

                    + 4 + DEFAULT_ROUNDING - 1)

                   & ~(DEFAULT_ROUNDING - 1));

      size = 4096 - extra;

    }

  h->chunkfun = (struct _obstack_chunk * (*)(void *,long)) chunkfun;

  h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;

  h->chunk_size = size;

  h->alignment_mask = alignment - 1;

  h->extra_arg = arg;

  h->use_extra_arg = 1;

  chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);

  if (!chunk)

    (*obstack_alloc_failed_handler) ();

  h->next_free = h->object_base = chunk->contents;

  h->chunk_limit = chunk->limit

    = (char *) chunk + h->chunk_size;

  chunk->prev = 0;

  /* The initial chunk now contains no empty object.  */

  h->maybe_empty_object = 0;

  h->alloc_failed = 0;

  return 1;

}

/* Allocate a new current chunk for the obstack *H

   on the assumption that LENGTH bytes need to be added

   to the current object, or a new object of length LENGTH allocated.

   Copies any partial object from the end of the old chunk

   to the beginning of the new one.  */

void

_obstack_newchunk (struct obstack *h, int length)

{

  register struct _obstack_chunk *old_chunk = h->chunk;

  register struct _obstack_chunk *new_chunk;

  register long new_size;

  register long obj_size = h->next_free - h->object_base;

  register long i;

  long already;

  /* Compute size for new chunk.  */

  new_size = (obj_size + length) + (obj_size >> 3) + 100;

  if (new_size < h->chunk_size)

    new_size = h->chunk_size;

  /* Allocate and initialize the new chunk.  */

  new_chunk = CALL_CHUNKFUN (h, new_size);

  if (!new_chunk)

    (*obstack_alloc_failed_handler) ();

  h->chunk = new_chunk;

  new_chunk->prev = old_chunk;

  new_chunk->limit = h->chunk_limit = (char *) new_chunk + new_size;

  /* Move the existing object to the new chunk.

     Word at a time is fast and is safe if the object

     is sufficiently aligned.  */

  if (h->alignment_mask + 1 >= DEFAULT_ALIGNMENT)

    {

      for (i = obj_size / sizeof (COPYING_UNIT) - 1;

           i >= 0; i--)

        ((COPYING_UNIT *)new_chunk->contents)[i]

          = ((COPYING_UNIT *)h->object_base)[i];

      /* We used to copy the odd few remaining bytes as one extra COPYING_UNIT,

         but that can cross a page boundary on a machine

         which does not do strict alignment for COPYING_UNITS.  */

      already = obj_size / sizeof (COPYING_UNIT) * sizeof (COPYING_UNIT);

    }

  else

    already = 0;

  /* Copy remaining bytes one by one.  */

  for (i = already; i < obj_size; i++)

    new_chunk->contents[i] = h->object_base[i];

  /* If the object just copied was the only data in OLD_CHUNK,

     free that chunk and remove it from the chain.

     But not if that chunk might contain an empty object.  */

  if (h->object_base == old_chunk->contents && ! h->maybe_empty_object)

    {

      new_chunk->prev = old_chunk->prev;

      CALL_FREEFUN (h, old_chunk);

    }

  h->object_base = new_chunk->contents;

  h->next_free = h->object_base + obj_size;

  /* The new chunk certainly contains no empty object yet.  */

  h->maybe_empty_object = 0;

}

/* Return nonzero if object OBJ has been allocated from obstack H.

   This is here for debugging.

   If you use it in a program, you are probably losing.  */

/* Suppress -Wmissing-prototypes warning.  We don't want to declare this in

   obstack.h because it is just for debugging.  */

int _obstack_allocated_p (struct obstack *h, POINTER obj);

int

_obstack_allocated_p (struct obstack *h, POINTER obj)

{

  register struct _obstack_chunk *lp;   /* below addr of any objects in this chunk */

  register struct _obstack_chunk *plp;  /* point to previous chunk if any */

  lp = (h)->chunk;

  /* We use >= rather than > since the object cannot be exactly at

     the beginning of the chunk but might be an empty object exactly

     at the end of an adjacent chunk.  */

  while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))

    {

      plp = lp->prev;

      lp = plp;

    }

  return lp != 0;

}

/* Free objects in obstack H, including OBJ and everything allocate

   more recently than OBJ.  If OBJ is zero, free everything in H.  */

#undef obstack_free

/* This function has two names with identical definitions.

   This is the first one, called from non-ANSI code.  */

void

_obstack_free (struct obstack *h, POINTER obj)

{

  register struct _obstack_chunk *lp;   /* below addr of any objects in this chunk */

  register struct _obstack_chunk *plp;  /* point to previous chunk if any */

  lp = h->chunk;

  /* We use >= because there cannot be an object at the beginning of a chunk.

     But there can be an empty object at that address

     at the end of another chunk.  */

  while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))

    {

      plp = lp->prev;

      CALL_FREEFUN (h, lp);

      lp = plp;

      /* If we switch chunks, we can't tell whether the new current

         chunk contains an empty object, so assume that it may.  */

      h->maybe_empty_object = 1;

    }

  if (lp)

    {

      h->object_base = h->next_free = (char *) (obj);

      h->chunk_limit = lp->limit;

      h->chunk = lp;

    }

  else if (obj != 0)

    /* obj is not in any of the chunks! */

    abort ();

}

/* This function is used from ANSI code.  */

void

obstack_free (struct obstack *h, POINTER obj)

{

  register struct _obstack_chunk *lp;   /* below addr of any objects in this chunk */

  register struct _obstack_chunk *plp;  /* point to previous chunk if any */

  lp = h->chunk;

  /* We use >= because there cannot be an object at the beginning of a chunk.

     But there can be an empty object at that address

     at the end of another chunk.  */

  while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))

    {

      plp = lp->prev;

      CALL_FREEFUN (h, lp);

      lp = plp;

      /* If we switch chunks, we can't tell whether the new current

         chunk contains an empty object, so assume that it may.  */

      h->maybe_empty_object = 1;

    }

  if (lp)

    {

      h->object_base = h->next_free = (char *) (obj);

      h->chunk_limit = lp->limit;

      h->chunk = lp;

    }

  else if (obj != 0)

    /* obj is not in any of the chunks! */

    abort ();

}

int

_obstack_memory_used (struct obstack *h)

{

  register struct _obstack_chunk* lp;

  register int nbytes = 0;

  for (lp = h->chunk; lp != 0; lp = lp->prev)

    {

      nbytes += lp->limit - (char *) lp;

    }

  return nbytes;

}

/* Define the error handler.  */

#ifndef _

# if (HAVE_LIBINTL_H && ENABLE_NLS) || defined _LIBC

#  include <libintl.h>

#  ifndef _

#   define _(Str) gettext (Str)

#  endif

# else

#  define _(Str) (Str)

# endif

#endif

static void

print_and_abort (void)

{

  fputs (_("memory exhausted\n"), stderr);

  exit (obstack_exit_failure);

}

#if 0

/* These are now turned off because the applications do not use it

   and it uses bcopy via obstack_grow, which causes trouble on sysV.  */

/* Now define the functional versions of the obstack macros.

   Define them to simply use the corresponding macros to do the job.  */

/* The function names appear in parentheses in order to prevent

   the macro-definitions of the names from being expanded there.  */

POINTER (obstack_base) (struct obstack *obstack)

{

  return obstack_base (obstack);

}

POINTER (obstack_next_free) (struct obstack *obstack)

{

  return obstack_next_free (obstack);

}

int (obstack_object_size) (struct obstack *obstack)

{

  return obstack_object_size (obstack);

}

int (obstack_room) (struct obstack *obstack)

{

  return obstack_room (obstack);

}

int (obstack_make_room) (struct obstack *obstack, int length)

{

  return obstack_make_room (obstack, length);

}

void (obstack_grow) (struct obstack *obstack, POINTER pointer, int length)

{

  obstack_grow (obstack, pointer, length);

}

void (obstack_grow0) (struct obstack *obstack, POINTER pointer, int length)

{

  obstack_grow0 (obstack, pointer, length);

}

void (obstack_1grow) (struct obstack *obstack, int character)

{

  obstack_1grow (obstack, character);

}

void (obstack_blank) (struct obstack *obstack, int length)

{

  obstack_blank (obstack, length);

}

void (obstack_1grow_fast) (struct obstack *obstack, int character)

{

  obstack_1grow_fast (obstack, character);

}

void (obstack_blank_fast) (struct obstack *obstack, int length)

{

  obstack_blank_fast (obstack, length);

}

POINTER (obstack_finish) (struct obstack *obstack)

{

  return obstack_finish (obstack);

}

POINTER (obstack_alloc) (struct obstack *obstack, int length)

{

  return obstack_alloc (obstack, length);

}

POINTER (obstack_copy) (struct obstack *obstack, POINTER pointer, int length)

{

  return obstack_copy (obstack, pointer, length);

}

POINTER (obstack_copy0) (struct obstack *obstack, POINTER pointer, int length)

{

  return obstack_copy0 (obstack, pointer, length);

}

#endif /* 0 */

#endif  /* !ELIDE_CODE */