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[bison.git] / lib / obstack.c

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

   Copyright (C) 1988-1994, 1996, 1997, 1998, 1999, 2000, 2001, 2002
   Free Software Foundation, Inc.

   This file is part of the GNU C Library.  Its master source is NOT part of
   the C library, however.  The master source lives in /gd/gnu/lib.

   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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

#if defined _LIBC && defined USE_IN_LIBIO
# include <wchar.h>
#endif

#ifndef ELIDE_CODE


# ifdef __STDC__
#  define POINTER void *
# else
#  define POINTER char *
# endif

/* 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 can be set to a user defined function which should either
   abort gracefully or use longjump - but shouldn't return.  This
   variable by default points to the internal function
   `print_and_abort'.  */
# if PROTOTYPES || (defined __STDC__ && __STDC__)
static void print_and_abort (void);
void (*obstack_alloc_failed_handler) (void) = print_and_abort;
# else
static void print_and_abort ();
void (*obstack_alloc_failed_handler) () = print_and_abort;
# endif

/* 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 PROTOTYPES || (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

\f
/* 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, calls obstack_alloc_failed_handler if
   allocation fails.  */

int
_obstack_begin (h, size, alignment, chunkfun, freefun)
     struct obstack *h;
     int size;
     int alignment;
# if PROTOTYPES || (defined __STDC__ && __STDC__)
     POINTER (*chunkfun) (long);
     void (*freefun) (void *);
# else
     POINTER (*chunkfun) ();
     void (*freefun) ();
# endif
{
  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;
    }

# if PROTOTYPES || (defined __STDC__ && __STDC__)
  h->chunkfun = (struct _obstack_chunk * (*)(void *, long)) chunkfun;
  h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
# else
  h->chunkfun = (struct _obstack_chunk * (*)()) chunkfun;
  h->freefun = freefun;
# endif
  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 (h, size, alignment, chunkfun, freefun, arg)
     struct obstack *h;
     int size;
     int alignment;
# if PROTOTYPES || (defined __STDC__ && __STDC__)
     POINTER (*chunkfun) (POINTER, long);
     void (*freefun) (POINTER, POINTER);
# else
     POINTER (*chunkfun) ();
     void (*freefun) ();
# endif
     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;
    }

# if PROTOTYPES || (defined __STDC__ && __STDC__)
  h->chunkfun = (struct _obstack_chunk * (*)(void *,long)) chunkfun;
  h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
# else
  h->chunkfun = (struct _obstack_chunk * (*)()) chunkfun;
  h->freefun = freefun;
# endif
  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 (h, length)
     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;
  char *object_base;

  /* Compute size for new chunk.  */
  new_size = (obj_size + length) + (obj_size >> 3) + h->alignment_mask + 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;

  /* Compute an aligned object_base in the new chunk */
  object_base =
    __INT_TO_PTR ((__PTR_TO_INT (new_chunk->contents) + h->alignment_mask)
		  & ~ (h->alignment_mask));

  /* 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 *)object_base)[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++)
    object_base[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 = object_base;
  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.  */

# if PROTOTYPES || (defined __STDC__ && __STDC__)
/* 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);
# endif

int
_obstack_allocated_p (h, obj)
     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;
}
\f
/* 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 (h, obj)
     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 (h, obj)
     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 ();
}
\f
int
_obstack_memory_used (h)
     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;
}
\f
/* 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
# if defined _LIBC && defined USE_IN_LIBIO
#  include <libio/iolibio.h>
#  define fputs(s, f) _IO_fputs (s, f)
# endif

# ifndef __attribute__
/* This feature is available in gcc versions 2.5 and later.  */
#  if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
#   define __attribute__(Spec) /* empty */
#  endif
# endif

static void
__attribute__ ((noreturn))
print_and_abort ()
{
  /* Don't change any of these strings.  Yes, it would be possible to add
     the newline to the string and use fputs or so.  But this must not
     happen because the "memory exhausted" message appears in other places
     like this and the translation should be reused instead of creating
     a very similar string which requires a separate translation.  */
# if defined _LIBC && defined USE_IN_LIBIO
  if (_IO_fwide (stderr, 0) > 0)
    __fwprintf (stderr, L"%s\n", _("memory exhausted"));
  else
# endif
    fprintf (stderr, "%s\n", _("memory exhausted"));
  exit (obstack_exit_failure);
}
\f
# 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.  */

#  if PROTOTYPES || (defined __STDC__ && __STDC__)
/* These function definitions do not work with non-ANSI preprocessors;
   they won't pass through the macro names in parentheses.  */

/* The function names appear in parentheses in order to prevent
   the macro-definitions of the names from being expanded there.  */

POINTER (obstack_base) (obstack)
     struct obstack *obstack;
{
  return obstack_base (obstack);
}

POINTER (obstack_next_free) (obstack)
     struct obstack *obstack;
{
  return obstack_next_free (obstack);
}

int (obstack_object_size) (obstack)
     struct obstack *obstack;
{
  return obstack_object_size (obstack);
}

int (obstack_room) (obstack)
     struct obstack *obstack;
{
  return obstack_room (obstack);
}

int (obstack_make_room) (obstack, length)
     struct obstack *obstack;
     int length;
{
  return obstack_make_room (obstack, length);
}

void (obstack_grow) (obstack, data, length)
     struct obstack *obstack;
     const POINTER data;
     int length;
{
  obstack_grow (obstack, data, length);
}

void (obstack_grow0) (obstack, data, length)
     struct obstack *obstack;
     const POINTER data;
     int length;
{
  obstack_grow0 (obstack, data, length);
}

void (obstack_1grow) (obstack, character)
     struct obstack *obstack;
     int character;
{
  obstack_1grow (obstack, character);
}

void (obstack_blank) (obstack, length)
     struct obstack *obstack;
     int length;
{
  obstack_blank (obstack, length);
}

void (obstack_1grow_fast) (obstack, character)
     struct obstack *obstack;
     int character;
{
  obstack_1grow_fast (obstack, character);
}

void (obstack_blank_fast) (obstack, length)
     struct obstack *obstack;
     int length;
{
  obstack_blank_fast (obstack, length);
}

POINTER (obstack_finish) (obstack)
     struct obstack *obstack;
{
  return obstack_finish (obstack);
}

POINTER (obstack_alloc) (obstack, length)
     struct obstack *obstack;
     int length;
{
  return obstack_alloc (obstack, length);
}

POINTER (obstack_copy) (obstack, address, length)
     struct obstack *obstack;
     const POINTER address;
     int length;
{
  return obstack_copy (obstack, address, length);
}

POINTER (obstack_copy0) (obstack, address, length)
     struct obstack *obstack;
     const POINTER address;
     int length;
{
  return obstack_copy0 (obstack, address, length);
}

#  endif /* PROTOTYPES || (defined __STDC__ && __STDC__) */

# endif /* 0 */

#endif	/* !ELIDE_CODE */