path: root/gdb/obstack.c

/* obstack.c - subroutines used implicitly by object stack macros
   Copyright (C) 1988 Free Software Foundation, Inc.

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  5. If you wish to incorporate parts of this program into other free
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#include "obstack.h"

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

/* The non-GNU-C macros copy the obstack into this global variable
   to avoid multiple evaluation.  */

struct obstack *_obstack;

/* Initialize an obstack H for use.  Specify chunk size SIZE.
   Objects start on multiples of ALIGNMENT.
   CHUNKFUN is the function to use to allocate chunks,
   and FREEFUN the function to free them.  */

void
_obstack_begin (h, size, alignment, chunkfun, freefun)
     struct obstack *h;
     int size;
     int alignment;
     POINTER (*chunkfun) ();
     void (*freefun) ();
{
  register struct _obstack_chunk* chunk;		/* points to new chunk */
  h->chunkfun = (struct _obstack_chunk * (*)()) chunkfun;
  h->freefun = freefun;
  h->chunk_size = size;
  h->alignment_mask = alignment - 1;

  chunk	= h->chunk = (*h->chunkfun) (h->chunk_size);
  h->next_free = h->object_base = chunk->contents;
  h->chunk_limit = chunk->limit
   = (char *) chunk + h->chunk_size;
  chunk->prev = 0;
}

/* 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 int obj_size = h->next_free - h->object_base;
  register int i;

  /* Compute size for new chunk.  */
  new_size = (obj_size + length) << 1;
  if (new_size < h->chunk_size)
    new_size = h->chunk_size;

  /* Allocate and initialize the new chunk.  */
  new_chunk = h->chunk = (*h->chunkfun) (new_size);
  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 because these
     structures are aligned at least that much.  */
  for (i = (obj_size + sizeof (int) - 1) / sizeof (int); i >= 0; i--)
    ((int *)new_chunk->contents)[i] = ((int *)h->object_base)[i];

  h->object_base = new_chunk->contents;
  h->next_free = h->object_base + obj_size;
}

/* Free objects in obstack H, including OBJ and everything allocate
   more recently than OBJ.  If OBJ is zero, free everything in H.  */

void
#ifdef __STDC__
#undef obstack_free
obstack_free (h, obj)

#else
_obstack_free (h, obj)
#endif
     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;
  while (lp != 0 && ((POINTER)lp > obj || (POINTER)(lp)->limit < obj))
    {
      plp = lp -> prev;
      (*h->freefun) (lp);
      lp = plp;
    }
  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 ();
}

/* Now define the functional versions of the obstack macros.
   Define them to simply use the corresponding macros to do the job.  */

#ifdef __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);
}

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

void (obstack_grow0) (obstack, pointer, length)
     struct obstack *obstack;
     POINTER pointer;
     int length;
{
  obstack_grow0 (obstack, pointer, 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, pointer, length)
     struct obstack *obstack;
     POINTER pointer;
     int length;
{
  return obstack_copy (obstack, pointer, length);
}

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

#endif /* __STDC__ */