/*      $NetBSD: dwarf_abbrev.c,v 1.5 2024/03/03 17:37:30 christos Exp $        */

/*-
* Copyright (c) 2009,2011 Kai Wang
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include "_libdwarf.h"

__RCSID("$NetBSD: dwarf_abbrev.c,v 1.5 2024/03/03 17:37:30 christos Exp $");
ELFTC_VCSID("Id: dwarf_abbrev.c 2072 2011-10-27 03:26:49Z jkoshy");

int
dwarf_get_abbrev(Dwarf_Debug dbg, Dwarf_Unsigned offset,
   Dwarf_Abbrev *return_abbrev, Dwarf_Unsigned *length,
   Dwarf_Unsigned *attr_count, Dwarf_Error *error)
{
       Dwarf_Abbrev ab;
       int ret;

       if (dbg == NULL || return_abbrev == NULL || length == NULL ||
           attr_count == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       ret = _dwarf_abbrev_parse(dbg, NULL, &offset, &ab, error);
       if (ret != DW_DLE_NONE) {
               if (ret == DW_DLE_NO_ENTRY) {
                       DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
                       return (DW_DLV_NO_ENTRY);
               } else
                       return (DW_DLV_ERROR);
       }

       *return_abbrev = ab;
       *length = ab->ab_length;
       *attr_count = ab->ab_atnum;

       return (DW_DLV_OK);
}

int
dwarf_get_abbrev_tag(Dwarf_Abbrev abbrev, Dwarf_Half *return_tag,
   Dwarf_Error *error)
{

       if (abbrev == NULL || return_tag == NULL) {
               DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       *return_tag = (Dwarf_Half) abbrev->ab_tag;

       return (DW_DLV_OK);
}

int
dwarf_get_abbrev_code(Dwarf_Abbrev abbrev, Dwarf_Unsigned *return_code,
   Dwarf_Error *error)
{

       if (abbrev == NULL || return_code == NULL) {
               DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       *return_code = abbrev->ab_entry;

       return (DW_DLV_OK);
}

int
dwarf_get_abbrev_children_flag(Dwarf_Abbrev abbrev, Dwarf_Signed *return_flag,
   Dwarf_Error *error)
{

       if (abbrev == NULL || return_flag == NULL) {
               DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       *return_flag = (Dwarf_Signed) abbrev->ab_children;

       return (DW_DLV_OK);
}

int
dwarf_get_abbrev_entry(Dwarf_Abbrev abbrev, Dwarf_Signed ndx,
   Dwarf_Half *attr_num, Dwarf_Signed *form, Dwarf_Off *offset,
   Dwarf_Error *error)
{
       Dwarf_AttrDef ad;
       int i;

       if (abbrev == NULL || attr_num == NULL || form == NULL ||
           offset == NULL) {
               DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       if (ndx < 0 || (uint64_t) ndx >= abbrev->ab_atnum) {
               DWARF_SET_ERROR(NULL, error, DW_DLE_NO_ENTRY);
               return (DW_DLV_NO_ENTRY);
       }

       ad = STAILQ_FIRST(&abbrev->ab_attrdef);
       for (i = 0; i < ndx && ad != NULL; i++)
               ad = STAILQ_NEXT(ad, ad_next);

       assert(ad != NULL);

       *attr_num = ad->ad_attrib;
       *form = ad->ad_form;
       *offset = ad->ad_offset;

       return (DW_DLV_OK);
}