libdwarf/dwarf_getabbrev.c

/* Internal abbrev list handling
   Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
   Written by Ulrich Drepper <drepper@redhat.com>, 2000.

   This program is Open Source software; you can redistribute it and/or
   modify it under the terms of the Open Software License version 1.0 as
   published by the Open Source Initiative.

   You should have received a copy of the Open Software License along
   with this program; if not, you may obtain a copy of the Open Software
   License version 1.0 from http://www.opensource.org/licenses/osl.php or
   by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
   3001 King Ranch Road, Ukiah, CA 95482.   */

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

#include <dwarf.h>
#include <stdlib.h>

#include <libdwarfP.h>


Dwarf_Abbrev
__libdwarf_get_abbrev (dbg, cu, code, error)
     Dwarf_Debug dbg;
     Dwarf_CU_Info cu;
     Dwarf_Word code;
     Dwarf_Error *error;
{
  Dwarf_Abbrev ent;

  /* See whether the entry is already in the hash table.  */
  ent = Dwarf_Abbrev_Hash_find (&cu->abbrev_hash, code, NULL);
  if (ent != NULL)
    return ent;

  while (1)
    {
      Dwarf_Unsigned length;
      Dwarf_Unsigned attr_count;

      if (dwarf_get_abbrev (dbg, cu->last_abbrev_offset, &ent, &length,
			    &attr_count, error) != DW_DLV_OK)
	return NULL;

      if (length == 1)
	/* This is the end of the list.  */
	break;

      /* Update the offset to the next record.  */
      cu->last_abbrev_offset += length;

      /* Insert the new entry into the hashing table.  */
      if (unlikely (Dwarf_Abbrev_Hash_insert (&cu->abbrev_hash, ent->code, ent)
		    != 0))
	{
	  free (ent);
	  __libdwarf_error (dbg, error, DW_E_NOMEM);
	  return NULL;
	}

      /* Is this the code we are looking for?  */
      if (ent->code == code)
	/* Yes!  */
	return ent;
    }

  /* If we come here we haven't found anything.  */
  __libdwarf_error (dbg, error, DW_E_NO_ABBR);
  return NULL;
}