source: branches/libc-0.6/src/binutils/include/objalloc.h@ 2651

/* objalloc.h -- routines to allocate memory for objects
   Copyright 1997, 2001 Free Software Foundation, Inc.
   Written by Ian Lance Taylor, Cygnus Solutions.

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

#ifndef OBJALLOC_H
#define OBJALLOC_H

#include "ansidecl.h"

/* These routines allocate space for an object.  The assumption is
   that the object will want to allocate space as it goes along, but
   will never want to free any particular block.  There is a function
   to free a block, which also frees all more recently allocated
   blocks.  There is also a function to free all the allocated space.

   This is essentially a specialization of obstacks.  The main
   difference is that a block may not be allocated a bit at a time.
   Another difference is that these routines are always built on top
   of malloc, and always pass an malloc failure back to the caller,
   unlike more recent versions of obstacks.  */

/* This is what an objalloc structure looks like.  Callers should not
   refer to these fields, nor should they allocate these structure
   themselves.  Instead, they should only create them via
   objalloc_init, and only access them via the functions and macros
   listed below.  The structure is only defined here so that we can
   access it via macros.  */

struct objalloc
{
  char *current_ptr;
  unsigned int current_space;
  PTR chunks;
};

/* Work out the required alignment.  */

struct objalloc_align { char x; double d; };

#if defined (__STDC__) && __STDC__
#ifndef offsetof
#include <stddef.h>
#endif
#endif
#ifndef offsetof
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
#endif